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@@ -1,5814 +1,5814 @@
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-#ifdef NEDMALLOC_ENABLED
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-/*
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- This is a version (aka dlmalloc) of malloc/free/realloc written by
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- Doug Lea and released to the public domain, as explained at
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- http://creativecommons.org/licenses/publicdomain. Send questions,
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- comments, complaints, performance data, etc to [email protected]
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-
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-* Version 2.8.4 Wed May 27 09:56:23 2009 Doug Lea (dl at gee)
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-
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- Note: There may be an updated version of this malloc obtainable at
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- ftp://gee.cs.oswego.edu/pub/misc/malloc.c
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- Check before installing!
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-
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-* Quickstart
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-
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- This library is all in one file to simplify the most common usage:
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- ftp it, compile it (-O3), and link it into another program. All of
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- the compile-time options default to reasonable values for use on
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- most platforms. You might later want to step through various
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- compile-time and dynamic tuning options.
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-
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- For convenience, an include file for code using this malloc is at:
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- ftp://gee.cs.oswego.edu/pub/misc/malloc-2.8.4.h
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- You don't really need this .h file unless you call functions not
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- defined in your system include files. The .h file contains only the
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- excerpts from this file needed for using this malloc on ANSI C/C++
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- systems, so long as you haven't changed compile-time options about
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- naming and tuning parameters. If you do, then you can create your
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- own malloc.h that does include all settings by cutting at the point
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- indicated below. Note that you may already by default be using a C
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- library containing a malloc that is based on some version of this
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- malloc (for example in linux). You might still want to use the one
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- in this file to customize settings or to avoid overheads associated
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- with library versions.
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-
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-* Vital statistics:
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-
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- Supported pointer/size_t representation: 4 or 8 bytes
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- size_t MUST be an unsigned type of the same width as
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- pointers. (If you are using an ancient system that declares
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- size_t as a signed type, or need it to be a different width
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- than pointers, you can use a previous release of this malloc
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- (e.g. 2.7.2) supporting these.)
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-
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- Alignment: 8 bytes (default)
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- This suffices for nearly all current machines and C compilers.
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- However, you can define MALLOC_ALIGNMENT to be wider than this
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- if necessary (up to 128bytes), at the expense of using more space.
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-
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- Minimum overhead per allocated chunk: 4 or 8 bytes (if 4byte sizes)
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- 8 or 16 bytes (if 8byte sizes)
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- Each malloced chunk has a hidden word of overhead holding size
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- and status information, and additional cross-check word
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- if FOOTERS is defined.
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-
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- Minimum allocated size: 4-byte ptrs: 16 bytes (including overhead)
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- 8-byte ptrs: 32 bytes (including overhead)
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-
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- Even a request for zero bytes (i.e., malloc(0)) returns a
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- pointer to something of the minimum allocatable size.
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- The maximum overhead wastage (i.e., number of extra bytes
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- allocated than were requested in malloc) is less than or equal
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- to the minimum size, except for requests >= mmap_threshold that
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- are serviced via mmap(), where the worst case wastage is about
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- 32 bytes plus the remainder from a system page (the minimal
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- mmap unit); typically 4096 or 8192 bytes.
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-
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- Security: static-safe; optionally more or less
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- The "security" of malloc refers to the ability of malicious
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- code to accentuate the effects of errors (for example, freeing
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- space that is not currently malloc'ed or overwriting past the
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- ends of chunks) in code that calls malloc. This malloc
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- guarantees not to modify any memory locations below the base of
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- heap, i.e., static variables, even in the presence of usage
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- errors. The routines additionally detect most improper frees
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- and reallocs. All this holds as long as the static bookkeeping
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- for malloc itself is not corrupted by some other means. This
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- is only one aspect of security -- these checks do not, and
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- cannot, detect all possible programming errors.
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-
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- If FOOTERS is defined nonzero, then each allocated chunk
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- carries an additional check word to verify that it was malloced
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- from its space. These check words are the same within each
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- execution of a program using malloc, but differ across
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- executions, so externally crafted fake chunks cannot be
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- freed. This improves security by rejecting frees/reallocs that
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- could corrupt heap memory, in addition to the checks preventing
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- writes to statics that are always on. This may further improve
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- security at the expense of time and space overhead. (Note that
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- FOOTERS may also be worth using with MSPACES.)
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-
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- By default detected errors cause the program to abort (calling
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- "abort()"). You can override this to instead proceed past
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- errors by defining PROCEED_ON_ERROR. In this case, a bad free
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- has no effect, and a malloc that encounters a bad address
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- caused by user overwrites will ignore the bad address by
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- dropping pointers and indices to all known memory. This may
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- be appropriate for programs that should continue if at all
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- possible in the face of programming errors, although they may
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- run out of memory because dropped memory is never reclaimed.
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-
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- If you don't like either of these options, you can define
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- CORRUPTION_ERROR_ACTION and USAGE_ERROR_ACTION to do anything
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- else. And if if you are sure that your program using malloc has
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- no errors or vulnerabilities, you can define INSECURE to 1,
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- which might (or might not) provide a small performance improvement.
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-
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- Thread-safety: NOT thread-safe unless USE_LOCKS defined
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- When USE_LOCKS is defined, each public call to malloc, free,
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- etc is surrounded with either a pthread mutex or a win32
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- spinlock (depending on WIN32). This is not especially fast, and
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- can be a major bottleneck. It is designed only to provide
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- minimal protection in concurrent environments, and to provide a
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- basis for extensions. If you are using malloc in a concurrent
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- program, consider instead using nedmalloc
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- (http://www.nedprod.com/programs/portable/nedmalloc/) or
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- ptmalloc (See http://www.malloc.de), which are derived
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- from versions of this malloc.
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-
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- System requirements: Any combination of MORECORE and/or MMAP/MUNMAP
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- This malloc can use unix sbrk or any emulation (invoked using
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- the CALL_MORECORE macro) and/or mmap/munmap or any emulation
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- (invoked using CALL_MMAP/CALL_MUNMAP) to get and release system
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- memory. On most unix systems, it tends to work best if both
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- MORECORE and MMAP are enabled. On Win32, it uses emulations
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- based on VirtualAlloc. It also uses common C library functions
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- like memset.
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-
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- Compliance: I believe it is compliant with the Single Unix Specification
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- (See http://www.unix.org). Also SVID/XPG, ANSI C, and probably
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- others as well.
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-
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-* Overview of algorithms
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-
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- This is not the fastest, most space-conserving, most portable, or
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- most tunable malloc ever written. However it is among the fastest
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- while also being among the most space-conserving, portable and
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- tunable. Consistent balance across these factors results in a good
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- general-purpose allocator for malloc-intensive programs.
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-
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- In most ways, this malloc is a best-fit allocator. Generally, it
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- chooses the best-fitting existing chunk for a request, with ties
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- broken in approximately least-recently-used order. (This strategy
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- normally maintains low fragmentation.) However, for requests less
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- than 256bytes, it deviates from best-fit when there is not an
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- exactly fitting available chunk by preferring to use space adjacent
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- to that used for the previous small request, as well as by breaking
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- ties in approximately most-recently-used order. (These enhance
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- locality of series of small allocations.) And for very large requests
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- (>= 256Kb by default), it relies on system memory mapping
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- facilities, if supported. (This helps avoid carrying around and
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- possibly fragmenting memory used only for large chunks.)
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-
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- All operations (except malloc_stats and mallinfo) have execution
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- times that are bounded by a constant factor of the number of bits in
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- a size_t, not counting any clearing in calloc or copying in realloc,
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- or actions surrounding MORECORE and MMAP that have times
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- proportional to the number of non-contiguous regions returned by
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- system allocation routines, which is often just 1. In real-time
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- applications, you can optionally suppress segment traversals using
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- NO_SEGMENT_TRAVERSAL, which assures bounded execution even when
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- system allocators return non-contiguous spaces, at the typical
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- expense of carrying around more memory and increased fragmentation.
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-
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- The implementation is not very modular and seriously overuses
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- macros. Perhaps someday all C compilers will do as good a job
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- inlining modular code as can now be done by brute-force expansion,
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- but now, enough of them seem not to.
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-
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- Some compilers issue a lot of warnings about code that is
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- dead/unreachable only on some platforms, and also about intentional
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- uses of negation on unsigned types. All known cases of each can be
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- ignored.
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-
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- For a longer but out of date high-level description, see
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- http://gee.cs.oswego.edu/dl/html/malloc.html
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-
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-* MSPACES
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- If MSPACES is defined, then in addition to malloc, free, etc.,
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- this file also defines mspace_malloc, mspace_free, etc. These
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- are versions of malloc routines that take an "mspace" argument
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- obtained using create_mspace, to control all internal bookkeeping.
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- If ONLY_MSPACES is defined, only these versions are compiled.
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- So if you would like to use this allocator for only some allocations,
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- and your system malloc for others, you can compile with
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- ONLY_MSPACES and then do something like...
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- static mspace mymspace = create_mspace(0,0); // for example
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- #define mymalloc(bytes) mspace_malloc(mymspace, bytes)
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-
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- (Note: If you only need one instance of an mspace, you can instead
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- use "USE_DL_PREFIX" to relabel the global malloc.)
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-
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- You can similarly create thread-local allocators by storing
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- mspaces as thread-locals. For example:
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- static __thread mspace tlms = 0;
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- void* tlmalloc(size_t bytes) {
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- if (tlms == 0) tlms = create_mspace(0, 0);
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- return mspace_malloc(tlms, bytes);
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- }
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- void tlfree(void* mem) { mspace_free(tlms, mem); }
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-
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- Unless FOOTERS is defined, each mspace is completely independent.
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- You cannot allocate from one and free to another (although
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- conformance is only weakly checked, so usage errors are not always
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- caught). If FOOTERS is defined, then each chunk carries around a tag
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- indicating its originating mspace, and frees are directed to their
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- originating spaces.
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-
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- ------------------------- Compile-time options ---------------------------
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-
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-Be careful in setting #define values for numerical constants of type
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-size_t. On some systems, literal values are not automatically extended
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-to size_t precision unless they are explicitly casted. You can also
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-use the symbolic values MAX_SIZE_T, SIZE_T_ONE, etc below.
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-
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-WIN32 default: defined if _WIN32 defined
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- Defining WIN32 sets up defaults for MS environment and compilers.
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- Otherwise defaults are for unix. Beware that there seem to be some
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- cases where this malloc might not be a pure drop-in replacement for
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- Win32 malloc: Random-looking failures from Win32 GDI API's (eg;
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- SetDIBits()) may be due to bugs in some video driver implementations
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- when pixel buffers are malloc()ed, and the region spans more than
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- one VirtualAlloc()ed region. Because dlmalloc uses a small (64Kb)
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- default granularity, pixel buffers may straddle virtual allocation
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- regions more often than when using the Microsoft allocator. You can
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- avoid this by using VirtualAlloc() and VirtualFree() for all pixel
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- buffers rather than using malloc(). If this is not possible,
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- recompile this malloc with a larger DEFAULT_GRANULARITY.
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-
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-MALLOC_ALIGNMENT default: (size_t)8
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- Controls the minimum alignment for malloc'ed chunks. It must be a
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- power of two and at least 8, even on machines for which smaller
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- alignments would suffice. It may be defined as larger than this
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- though. Note however that code and data structures are optimized for
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- the case of 8-byte alignment.
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-
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-MSPACES default: 0 (false)
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- If true, compile in support for independent allocation spaces.
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- This is only supported if HAVE_MMAP is true.
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-
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-ONLY_MSPACES default: 0 (false)
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- If true, only compile in mspace versions, not regular versions.
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-
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-USE_LOCKS default: 0 (false)
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- Causes each call to each public routine to be surrounded with
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- pthread or WIN32 mutex lock/unlock. (If set true, this can be
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- overridden on a per-mspace basis for mspace versions.) If set to a
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- non-zero value other than 1, locks are used, but their
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- implementation is left out, so lock functions must be supplied manually,
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- as described below.
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-
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-USE_SPIN_LOCKS default: 1 iff USE_LOCKS and on x86 using gcc or MSC
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- If true, uses custom spin locks for locking. This is currently
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- supported only for x86 platforms using gcc or recent MS compilers.
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- Otherwise, posix locks or win32 critical sections are used.
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-
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-FOOTERS default: 0
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- If true, provide extra checking and dispatching by placing
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- information in the footers of allocated chunks. This adds
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- space and time overhead.
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-
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-INSECURE default: 0
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- If true, omit checks for usage errors and heap space overwrites.
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-
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-USE_DL_PREFIX default: NOT defined
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- Causes compiler to prefix all public routines with the string 'dl'.
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- This can be useful when you only want to use this malloc in one part
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- of a program, using your regular system malloc elsewhere.
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-
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-ABORT default: defined as abort()
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- Defines how to abort on failed checks. On most systems, a failed
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- check cannot die with an "assert" or even print an informative
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- message, because the underlying print routines in turn call malloc,
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- which will fail again. Generally, the best policy is to simply call
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- abort(). It's not very useful to do more than this because many
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- errors due to overwriting will show up as address faults (null, odd
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- addresses etc) rather than malloc-triggered checks, so will also
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- abort. Also, most compilers know that abort() does not return, so
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- can better optimize code conditionally calling it.
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-
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-PROCEED_ON_ERROR default: defined as 0 (false)
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- Controls whether detected bad addresses cause them to bypassed
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- rather than aborting. If set, detected bad arguments to free and
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- realloc are ignored. And all bookkeeping information is zeroed out
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- upon a detected overwrite of freed heap space, thus losing the
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- ability to ever return it from malloc again, but enabling the
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- application to proceed. If PROCEED_ON_ERROR is defined, the
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- static variable malloc_corruption_error_count is compiled in
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- and can be examined to see if errors have occurred. This option
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- generates slower code than the default abort policy.
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-
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-DEBUG default: NOT defined
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- The DEBUG setting is mainly intended for people trying to modify
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- this code or diagnose problems when porting to new platforms.
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- However, it may also be able to better isolate user errors than just
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- using runtime checks. The assertions in the check routines spell
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- out in more detail the assumptions and invariants underlying the
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- algorithms. The checking is fairly extensive, and will slow down
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- execution noticeably. Calling malloc_stats or mallinfo with DEBUG
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- set will attempt to check every non-mmapped allocated and free chunk
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- in the course of computing the summaries.
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-
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-ABORT_ON_ASSERT_FAILURE default: defined as 1 (true)
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- Debugging assertion failures can be nearly impossible if your
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- version of the assert macro causes malloc to be called, which will
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- lead to a cascade of further failures, blowing the runtime stack.
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- ABORT_ON_ASSERT_FAILURE cause assertions failures to call abort(),
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- which will usually make debugging easier.
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-
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-MALLOC_FAILURE_ACTION default: sets errno to ENOMEM, or no-op on win32
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- The action to take before "return 0" when malloc fails to be able to
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- return memory because there is none available.
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-
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-HAVE_MORECORE default: 1 (true) unless win32 or ONLY_MSPACES
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- True if this system supports sbrk or an emulation of it.
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-
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-MORECORE default: sbrk
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- The name of the sbrk-style system routine to call to obtain more
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- memory. See below for guidance on writing custom MORECORE
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- functions. The type of the argument to sbrk/MORECORE varies across
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- systems. It cannot be size_t, because it supports negative
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- arguments, so it is normally the signed type of the same width as
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- size_t (sometimes declared as "intptr_t"). It doesn't much matter
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- though. Internally, we only call it with arguments less than half
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- the max value of a size_t, which should work across all reasonable
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- possibilities, although sometimes generating compiler warnings.
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-
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-MORECORE_CONTIGUOUS default: 1 (true) if HAVE_MORECORE
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- If true, take advantage of fact that consecutive calls to MORECORE
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- with positive arguments always return contiguous increasing
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- addresses. This is true of unix sbrk. It does not hurt too much to
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- set it true anyway, since malloc copes with non-contiguities.
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- Setting it false when definitely non-contiguous saves time
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- and possibly wasted space it would take to discover this though.
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-
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-MORECORE_CANNOT_TRIM default: NOT defined
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- True if MORECORE cannot release space back to the system when given
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- negative arguments. This is generally necessary only if you are
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- using a hand-crafted MORECORE function that cannot handle negative
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- arguments.
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-
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-NO_SEGMENT_TRAVERSAL default: 0
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- If non-zero, suppresses traversals of memory segments
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- returned by either MORECORE or CALL_MMAP. This disables
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- merging of segments that are contiguous, and selectively
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- releasing them to the OS if unused, but bounds execution times.
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-
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-HAVE_MMAP default: 1 (true)
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- True if this system supports mmap or an emulation of it. If so, and
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- HAVE_MORECORE is not true, MMAP is used for all system
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- allocation. If set and HAVE_MORECORE is true as well, MMAP is
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- primarily used to directly allocate very large blocks. It is also
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- used as a backup strategy in cases where MORECORE fails to provide
|
|
|
- space from system. Note: A single call to MUNMAP is assumed to be
|
|
|
- able to unmap memory that may have be allocated using multiple calls
|
|
|
- to MMAP, so long as they are adjacent.
|
|
|
-
|
|
|
-HAVE_MREMAP default: 1 on linux, else 0
|
|
|
- If true realloc() uses mremap() to re-allocate large blocks and
|
|
|
- extend or shrink allocation spaces.
|
|
|
-
|
|
|
-MMAP_CLEARS default: 1 except on WINCE.
|
|
|
- True if mmap clears memory so calloc doesn't need to. This is true
|
|
|
- for standard unix mmap using /dev/zero and on WIN32 except for WINCE.
|
|
|
-
|
|
|
-USE_BUILTIN_FFS default: 0 (i.e., not used)
|
|
|
- Causes malloc to use the builtin ffs() function to compute indices.
|
|
|
- Some compilers may recognize and intrinsify ffs to be faster than the
|
|
|
- supplied C version. Also, the case of x86 using gcc is special-cased
|
|
|
- to an asm instruction, so is already as fast as it can be, and so
|
|
|
- this setting has no effect. Similarly for Win32 under recent MS compilers.
|
|
|
- (On most x86s, the asm version is only slightly faster than the C version.)
|
|
|
-
|
|
|
-malloc_getpagesize default: derive from system includes, or 4096.
|
|
|
- The system page size. To the extent possible, this malloc manages
|
|
|
- memory from the system in page-size units. This may be (and
|
|
|
- usually is) a function rather than a constant. This is ignored
|
|
|
- if WIN32, where page size is determined using getSystemInfo during
|
|
|
- initialization. This may be several megabytes if ENABLE_LARGE_PAGES
|
|
|
- is enabled.
|
|
|
-
|
|
|
-ENABLE_LARGE_PAGES default: NOT defined
|
|
|
- Causes the system page size to be the value of GetLargePageMinimum()
|
|
|
- if that function is available (Windows Server 2003/Vista or later).
|
|
|
- This allows the use of large page entries in the MMU which can
|
|
|
- significantly improve performance in large working set applications
|
|
|
- as TLB cache load is reduced by a factor of three. Note that enabling
|
|
|
- this option is equal to locking the process' memory in current
|
|
|
- implementations of Windows and requires the SE_LOCK_MEMORY_PRIVILEGE
|
|
|
- to be held by the process in order to succeed.
|
|
|
-
|
|
|
-USE_DEV_RANDOM default: 0 (i.e., not used)
|
|
|
- Causes malloc to use /dev/random to initialize secure magic seed for
|
|
|
- stamping footers. Otherwise, the current time is used.
|
|
|
-
|
|
|
-NO_MALLINFO default: 0
|
|
|
- If defined, don't compile "mallinfo". This can be a simple way
|
|
|
- of dealing with mismatches between system declarations and
|
|
|
- those in this file.
|
|
|
-
|
|
|
-MALLINFO_FIELD_TYPE default: size_t
|
|
|
- The type of the fields in the mallinfo struct. This was originally
|
|
|
- defined as "int" in SVID etc, but is more usefully defined as
|
|
|
- size_t. The value is used only if HAVE_USR_INCLUDE_MALLOC_H is not set
|
|
|
-
|
|
|
-REALLOC_ZERO_BYTES_FREES default: not defined
|
|
|
- This should be set if a call to realloc with zero bytes should
|
|
|
- be the same as a call to free. Some people think it should. Otherwise,
|
|
|
- since this malloc returns a unique pointer for malloc(0), so does
|
|
|
- realloc(p, 0).
|
|
|
-
|
|
|
-LACKS_UNISTD_H, LACKS_FCNTL_H, LACKS_SYS_PARAM_H, LACKS_SYS_MMAN_H
|
|
|
-LACKS_STRINGS_H, LACKS_STRING_H, LACKS_SYS_TYPES_H, LACKS_ERRNO_H
|
|
|
-LACKS_STDLIB_H default: NOT defined unless on WIN32
|
|
|
- Define these if your system does not have these header files.
|
|
|
- You might need to manually insert some of the declarations they provide.
|
|
|
-
|
|
|
-DEFAULT_GRANULARITY default: page size if MORECORE_CONTIGUOUS,
|
|
|
- system_info.dwAllocationGranularity in WIN32,
|
|
|
- GetLargePageMinimum() if ENABLE_LARGE_PAGES,
|
|
|
- otherwise 64K.
|
|
|
- Also settable using mallopt(M_GRANULARITY, x)
|
|
|
- The unit for allocating and deallocating memory from the system. On
|
|
|
- most systems with contiguous MORECORE, there is no reason to
|
|
|
- make this more than a page. However, systems with MMAP tend to
|
|
|
- either require or encourage larger granularities. You can increase
|
|
|
- this value to prevent system allocation functions to be called so
|
|
|
- often, especially if they are slow. The value must be at least one
|
|
|
- page and must be a power of two. Setting to 0 causes initialization
|
|
|
- to either page size or win32 region size. (Note: In previous
|
|
|
- versions of malloc, the equivalent of this option was called
|
|
|
- "TOP_PAD")
|
|
|
-
|
|
|
-DEFAULT_GRANULARITY_ALIGNED default: undefined (which means page size)
|
|
|
- Whether to enforce alignment when allocating and deallocating memory
|
|
|
- from the system i.e. the base address of all allocations will be
|
|
|
- aligned to DEFAULT_GRANULARITY if it is set. Note that enabling this carries
|
|
|
- some overhead as multiple calls must now be made when probing for a valid
|
|
|
- aligned value, however it does greatly ease the checking for whether
|
|
|
- a given memory pointer was allocated by this allocator rather than
|
|
|
- some other.
|
|
|
-
|
|
|
-DEFAULT_TRIM_THRESHOLD default: 2MB
|
|
|
- Also settable using mallopt(M_TRIM_THRESHOLD, x)
|
|
|
- The maximum amount of unused top-most memory to keep before
|
|
|
- releasing via malloc_trim in free(). Automatic trimming is mainly
|
|
|
- useful in long-lived programs using contiguous MORECORE. Because
|
|
|
- trimming via sbrk can be slow on some systems, and can sometimes be
|
|
|
- wasteful (in cases where programs immediately afterward allocate
|
|
|
- more large chunks) the value should be high enough so that your
|
|
|
- overall system performance would improve by releasing this much
|
|
|
- memory. As a rough guide, you might set to a value close to the
|
|
|
- average size of a process (program) running on your system.
|
|
|
- Releasing this much memory would allow such a process to run in
|
|
|
- memory. Generally, it is worth tuning trim thresholds when a
|
|
|
- program undergoes phases where several large chunks are allocated
|
|
|
- and released in ways that can reuse each other's storage, perhaps
|
|
|
- mixed with phases where there are no such chunks at all. The trim
|
|
|
- value must be greater than page size to have any useful effect. To
|
|
|
- disable trimming completely, you can set to MAX_SIZE_T. Note that the trick
|
|
|
- some people use of mallocing a huge space and then freeing it at
|
|
|
- program startup, in an attempt to reserve system memory, doesn't
|
|
|
- have the intended effect under automatic trimming, since that memory
|
|
|
- will immediately be returned to the system.
|
|
|
-
|
|
|
-DEFAULT_MMAP_THRESHOLD default: 256K
|
|
|
- Also settable using mallopt(M_MMAP_THRESHOLD, x)
|
|
|
- The request size threshold for using MMAP to directly service a
|
|
|
- request. Requests of at least this size that cannot be allocated
|
|
|
- using already-existing space will be serviced via mmap. (If enough
|
|
|
- normal freed space already exists it is used instead.) Using mmap
|
|
|
- segregates relatively large chunks of memory so that they can be
|
|
|
- individually obtained and released from the host system. A request
|
|
|
- serviced through mmap is never reused by any other request (at least
|
|
|
- not directly; the system may just so happen to remap successive
|
|
|
- requests to the same locations). Segregating space in this way has
|
|
|
- the benefits that: Mmapped space can always be individually released
|
|
|
- back to the system, which helps keep the system level memory demands
|
|
|
- of a long-lived program low. Also, mapped memory doesn't become
|
|
|
- `locked' between other chunks, as can happen with normally allocated
|
|
|
- chunks, which means that even trimming via malloc_trim would not
|
|
|
- release them. However, it has the disadvantage that the space
|
|
|
- cannot be reclaimed, consolidated, and then used to service later
|
|
|
- requests, as happens with normal chunks. The advantages of mmap
|
|
|
- nearly always outweigh disadvantages for "large" chunks, but the
|
|
|
- value of "large" may vary across systems. The default is an
|
|
|
- empirically derived value that works well in most systems. You can
|
|
|
- disable mmap by setting to MAX_SIZE_T.
|
|
|
-
|
|
|
-MAX_RELEASE_CHECK_RATE default: 4095 unless not HAVE_MMAP
|
|
|
- The number of consolidated frees between checks to release
|
|
|
- unused segments when freeing. When using non-contiguous segments,
|
|
|
- especially with multiple mspaces, checking only for topmost space
|
|
|
- doesn't always suffice to trigger trimming. To compensate for this,
|
|
|
- free() will, with a period of MAX_RELEASE_CHECK_RATE (or the
|
|
|
- current number of segments, if greater) try to release unused
|
|
|
- segments to the OS when freeing chunks that result in
|
|
|
- consolidation. The best value for this parameter is a compromise
|
|
|
- between slowing down frees with relatively costly checks that
|
|
|
- rarely trigger versus holding on to unused memory. To effectively
|
|
|
- disable, set to MAX_SIZE_T. This may lead to a very slight speed
|
|
|
- improvement at the expense of carrying around more memory.
|
|
|
-*/
|
|
|
-
|
|
|
-/* Version identifier to allow people to support multiple versions */
|
|
|
-#ifndef DLMALLOC_VERSION
|
|
|
-#define DLMALLOC_VERSION 20804
|
|
|
-#endif /* DLMALLOC_VERSION */
|
|
|
-
|
|
|
-#ifndef WIN32
|
|
|
-#ifdef _WIN32
|
|
|
-#define WIN32 1
|
|
|
-#endif /* _WIN32 */
|
|
|
-#ifdef _WIN32_WCE
|
|
|
-#define LACKS_FCNTL_H
|
|
|
-#define WIN32 1
|
|
|
-#endif /* _WIN32_WCE */
|
|
|
-#endif /* WIN32 */
|
|
|
-#ifdef WIN32
|
|
|
-#define WIN32_LEAN_AND_MEAN
|
|
|
-#include <windows.h>
|
|
|
-#include <tchar.h>
|
|
|
-#define HAVE_MMAP 1
|
|
|
-#define HAVE_MORECORE 0
|
|
|
-#define LACKS_UNISTD_H
|
|
|
-#define LACKS_SYS_PARAM_H
|
|
|
-#define LACKS_SYS_MMAN_H
|
|
|
-#define LACKS_STRING_H
|
|
|
-#define LACKS_STRINGS_H
|
|
|
-#define LACKS_SYS_TYPES_H
|
|
|
-#define LACKS_ERRNO_H
|
|
|
-#ifndef MALLOC_FAILURE_ACTION
|
|
|
-#define MALLOC_FAILURE_ACTION
|
|
|
-#endif /* MALLOC_FAILURE_ACTION */
|
|
|
-#ifdef _WIN32_WCE /* WINCE reportedly does not clear */
|
|
|
-#define MMAP_CLEARS 0
|
|
|
-#else
|
|
|
-#define MMAP_CLEARS 1
|
|
|
-#endif /* _WIN32_WCE */
|
|
|
-#endif /* WIN32 */
|
|
|
-
|
|
|
-#if defined(DARWIN) || defined(_DARWIN)
|
|
|
-/* Mac OSX docs advise not to use sbrk; it seems better to use mmap */
|
|
|
-#ifndef HAVE_MORECORE
|
|
|
-#define HAVE_MORECORE 0
|
|
|
-#define HAVE_MMAP 1
|
|
|
-/* OSX allocators provide 16 byte alignment */
|
|
|
-#ifndef MALLOC_ALIGNMENT
|
|
|
-#define MALLOC_ALIGNMENT ((size_t)16U)
|
|
|
-#endif
|
|
|
-#endif /* HAVE_MORECORE */
|
|
|
-#endif /* DARWIN */
|
|
|
-
|
|
|
-#ifndef LACKS_SYS_TYPES_H
|
|
|
-#include <sys/types.h> /* For size_t */
|
|
|
-#endif /* LACKS_SYS_TYPES_H */
|
|
|
-
|
|
|
-#if (defined(__GNUC__) && ((defined(__i386__) || defined(__x86_64__)))) || (defined(_MSC_VER) && _MSC_VER>=1310)
|
|
|
-#define SPIN_LOCKS_AVAILABLE 1
|
|
|
-#else
|
|
|
-#define SPIN_LOCKS_AVAILABLE 0
|
|
|
-#endif
|
|
|
-
|
|
|
-/* The maximum possible size_t value has all bits set */
|
|
|
-#define MAX_SIZE_T (~(size_t)0)
|
|
|
-
|
|
|
-#ifndef ONLY_MSPACES
|
|
|
-#define ONLY_MSPACES 0 /* define to a value */
|
|
|
-#else
|
|
|
-#define ONLY_MSPACES 1
|
|
|
-#endif /* ONLY_MSPACES */
|
|
|
-#ifndef MSPACES
|
|
|
-#if ONLY_MSPACES
|
|
|
-#define MSPACES 1
|
|
|
-#else /* ONLY_MSPACES */
|
|
|
-#define MSPACES 0
|
|
|
-#endif /* ONLY_MSPACES */
|
|
|
-#endif /* MSPACES */
|
|
|
-#ifndef MALLOC_ALIGNMENT
|
|
|
-#define MALLOC_ALIGNMENT ((size_t)8U)
|
|
|
-#endif /* MALLOC_ALIGNMENT */
|
|
|
-#ifndef FOOTERS
|
|
|
-#define FOOTERS 0
|
|
|
-#endif /* FOOTERS */
|
|
|
-#ifndef ABORT
|
|
|
-#define ABORT abort()
|
|
|
-#endif /* ABORT */
|
|
|
-#ifndef ABORT_ON_ASSERT_FAILURE
|
|
|
-#define ABORT_ON_ASSERT_FAILURE 1
|
|
|
-#endif /* ABORT_ON_ASSERT_FAILURE */
|
|
|
-#ifndef PROCEED_ON_ERROR
|
|
|
-#define PROCEED_ON_ERROR 0
|
|
|
-#endif /* PROCEED_ON_ERROR */
|
|
|
-#ifndef USE_LOCKS
|
|
|
-#define USE_LOCKS 0
|
|
|
-#endif /* USE_LOCKS */
|
|
|
-#ifndef USE_SPIN_LOCKS
|
|
|
-#if USE_LOCKS && SPIN_LOCKS_AVAILABLE
|
|
|
-#define USE_SPIN_LOCKS 1
|
|
|
-#else
|
|
|
-#define USE_SPIN_LOCKS 0
|
|
|
-#endif /* USE_LOCKS && SPIN_LOCKS_AVAILABLE. */
|
|
|
-#endif /* USE_SPIN_LOCKS */
|
|
|
-#ifndef INSECURE
|
|
|
-#define INSECURE 0
|
|
|
-#endif /* INSECURE */
|
|
|
-#ifndef HAVE_MMAP
|
|
|
-#define HAVE_MMAP 1
|
|
|
-#endif /* HAVE_MMAP */
|
|
|
-#ifndef MMAP_CLEARS
|
|
|
-#define MMAP_CLEARS 1
|
|
|
-#endif /* MMAP_CLEARS */
|
|
|
-#ifndef HAVE_MREMAP
|
|
|
-#ifdef linux
|
|
|
-#define HAVE_MREMAP 1
|
|
|
-#else /* linux */
|
|
|
-#define HAVE_MREMAP 0
|
|
|
-#endif /* linux */
|
|
|
-#endif /* HAVE_MREMAP */
|
|
|
-#ifndef MALLOC_FAILURE_ACTION
|
|
|
-#define MALLOC_FAILURE_ACTION errno = ENOMEM;
|
|
|
-#endif /* MALLOC_FAILURE_ACTION */
|
|
|
-#ifndef HAVE_MORECORE
|
|
|
-#if ONLY_MSPACES
|
|
|
-#define HAVE_MORECORE 0
|
|
|
-#else /* ONLY_MSPACES */
|
|
|
-#define HAVE_MORECORE 1
|
|
|
-#endif /* ONLY_MSPACES */
|
|
|
-#endif /* HAVE_MORECORE */
|
|
|
-#if !HAVE_MORECORE
|
|
|
-#define MORECORE_CONTIGUOUS 0
|
|
|
-#else /* !HAVE_MORECORE */
|
|
|
-#define MORECORE_DEFAULT sbrk
|
|
|
-#ifndef MORECORE_CONTIGUOUS
|
|
|
-#define MORECORE_CONTIGUOUS 1
|
|
|
-#endif /* MORECORE_CONTIGUOUS */
|
|
|
-#endif /* HAVE_MORECORE */
|
|
|
-#ifndef DEFAULT_GRANULARITY
|
|
|
-#if (MORECORE_CONTIGUOUS || defined(WIN32))
|
|
|
-#define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */
|
|
|
-#else /* MORECORE_CONTIGUOUS */
|
|
|
-#define DEFAULT_GRANULARITY ((size_t)64U * (size_t)1024U)
|
|
|
-#endif /* MORECORE_CONTIGUOUS */
|
|
|
-#endif /* DEFAULT_GRANULARITY */
|
|
|
-#ifndef DEFAULT_TRIM_THRESHOLD
|
|
|
-#ifndef MORECORE_CANNOT_TRIM
|
|
|
-#define DEFAULT_TRIM_THRESHOLD ((size_t)2U * (size_t)1024U * (size_t)1024U)
|
|
|
-#else /* MORECORE_CANNOT_TRIM */
|
|
|
-#define DEFAULT_TRIM_THRESHOLD MAX_SIZE_T
|
|
|
-#endif /* MORECORE_CANNOT_TRIM */
|
|
|
-#endif /* DEFAULT_TRIM_THRESHOLD */
|
|
|
-#ifndef DEFAULT_MMAP_THRESHOLD
|
|
|
-#if HAVE_MMAP
|
|
|
-#define DEFAULT_MMAP_THRESHOLD ((size_t)256U * (size_t)1024U)
|
|
|
-#else /* HAVE_MMAP */
|
|
|
-#define DEFAULT_MMAP_THRESHOLD MAX_SIZE_T
|
|
|
-#endif /* HAVE_MMAP */
|
|
|
-#endif /* DEFAULT_MMAP_THRESHOLD */
|
|
|
-#ifndef MAX_RELEASE_CHECK_RATE
|
|
|
-#if HAVE_MMAP
|
|
|
-#define MAX_RELEASE_CHECK_RATE 4095
|
|
|
-#else
|
|
|
-#define MAX_RELEASE_CHECK_RATE MAX_SIZE_T
|
|
|
-#endif /* HAVE_MMAP */
|
|
|
-#endif /* MAX_RELEASE_CHECK_RATE */
|
|
|
-#ifndef USE_BUILTIN_FFS
|
|
|
-#define USE_BUILTIN_FFS 0
|
|
|
-#endif /* USE_BUILTIN_FFS */
|
|
|
-#ifndef USE_DEV_RANDOM
|
|
|
-#define USE_DEV_RANDOM 0
|
|
|
-#endif /* USE_DEV_RANDOM */
|
|
|
-#ifndef NO_MALLINFO
|
|
|
-#define NO_MALLINFO 0
|
|
|
-#endif /* NO_MALLINFO */
|
|
|
-#ifndef MALLINFO_FIELD_TYPE
|
|
|
-#define MALLINFO_FIELD_TYPE size_t
|
|
|
-#endif /* MALLINFO_FIELD_TYPE */
|
|
|
-#ifndef NO_SEGMENT_TRAVERSAL
|
|
|
-#define NO_SEGMENT_TRAVERSAL 0
|
|
|
-#endif /* NO_SEGMENT_TRAVERSAL */
|
|
|
-
|
|
|
-/*
|
|
|
- mallopt tuning options. SVID/XPG defines four standard parameter
|
|
|
- numbers for mallopt, normally defined in malloc.h. None of these
|
|
|
- are used in this malloc, so setting them has no effect. But this
|
|
|
- malloc does support the following options.
|
|
|
-*/
|
|
|
-
|
|
|
-#define M_TRIM_THRESHOLD (-1)
|
|
|
-#define M_GRANULARITY (-2)
|
|
|
-#define M_MMAP_THRESHOLD (-3)
|
|
|
-
|
|
|
-/* ------------------------ Mallinfo declarations ------------------------ */
|
|
|
-
|
|
|
-#if !NO_MALLINFO
|
|
|
-/*
|
|
|
- This version of malloc supports the standard SVID/XPG mallinfo
|
|
|
- routine that returns a struct containing usage properties and
|
|
|
- statistics. It should work on any system that has a
|
|
|
- /usr/include/malloc.h defining struct mallinfo. The main
|
|
|
- declaration needed is the mallinfo struct that is returned (by-copy)
|
|
|
- by mallinfo(). The malloinfo struct contains a bunch of fields that
|
|
|
- are not even meaningful in this version of malloc. These fields are
|
|
|
- are instead filled by mallinfo() with other numbers that might be of
|
|
|
- interest.
|
|
|
-
|
|
|
- HAVE_USR_INCLUDE_MALLOC_H should be set if you have a
|
|
|
- /usr/include/malloc.h file that includes a declaration of struct
|
|
|
- mallinfo. If so, it is included; else a compliant version is
|
|
|
- declared below. These must be precisely the same for mallinfo() to
|
|
|
- work. The original SVID version of this struct, defined on most
|
|
|
- systems with mallinfo, declares all fields as ints. But some others
|
|
|
- define as unsigned long. If your system defines the fields using a
|
|
|
- type of different width than listed here, you MUST #include your
|
|
|
- system version and #define HAVE_USR_INCLUDE_MALLOC_H.
|
|
|
-*/
|
|
|
-
|
|
|
-/* #define HAVE_USR_INCLUDE_MALLOC_H */
|
|
|
-
|
|
|
-#ifdef HAVE_USR_INCLUDE_MALLOC_H
|
|
|
-#include "/usr/include/malloc.h"
|
|
|
-#else /* HAVE_USR_INCLUDE_MALLOC_H */
|
|
|
-#ifndef STRUCT_MALLINFO_DECLARED
|
|
|
-#define STRUCT_MALLINFO_DECLARED 1
|
|
|
-struct mallinfo {
|
|
|
- MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
|
|
|
- MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
|
|
|
- MALLINFO_FIELD_TYPE smblks; /* always 0 */
|
|
|
- MALLINFO_FIELD_TYPE hblks; /* always 0 */
|
|
|
- MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
|
|
|
- MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
|
|
|
- MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
|
|
|
- MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
|
|
|
- MALLINFO_FIELD_TYPE fordblks; /* total free space */
|
|
|
- MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
|
|
|
-};
|
|
|
-#endif /* STRUCT_MALLINFO_DECLARED */
|
|
|
-#endif /* HAVE_USR_INCLUDE_MALLOC_H */
|
|
|
-#endif /* NO_MALLINFO */
|
|
|
-
|
|
|
-/*
|
|
|
- Try to persuade compilers to inline. The most critical functions for
|
|
|
- inlining are defined as macros, so these aren't used for them.
|
|
|
-*/
|
|
|
-
|
|
|
-#ifndef FORCEINLINE
|
|
|
- #if defined(__GNUC__)
|
|
|
-#define FORCEINLINE __inline __attribute__ ((always_inline))
|
|
|
- #elif defined(_MSC_VER)
|
|
|
- #define FORCEINLINE __forceinline
|
|
|
- #endif
|
|
|
-#endif
|
|
|
-#ifndef NOINLINE
|
|
|
- #if defined(__GNUC__)
|
|
|
- #define NOINLINE __attribute__ ((noinline))
|
|
|
- #elif defined(_MSC_VER)
|
|
|
- #define NOINLINE __declspec(noinline)
|
|
|
- #else
|
|
|
- #define NOINLINE
|
|
|
- #endif
|
|
|
-#endif
|
|
|
-
|
|
|
-#ifdef __cplusplus
|
|
|
-extern "C" {
|
|
|
-#ifndef FORCEINLINE
|
|
|
- #define FORCEINLINE inline
|
|
|
-#endif
|
|
|
-#endif /* __cplusplus */
|
|
|
-#ifndef FORCEINLINE
|
|
|
- #define FORCEINLINE
|
|
|
-#endif
|
|
|
-
|
|
|
-#if !ONLY_MSPACES
|
|
|
-
|
|
|
-/* ------------------- Declarations of public routines ------------------- */
|
|
|
-
|
|
|
-#ifndef USE_DL_PREFIX
|
|
|
-#define dlcalloc calloc
|
|
|
-#define dlfree free
|
|
|
-#define dlmalloc malloc
|
|
|
-#define dlmemalign memalign
|
|
|
-#define dlrealloc realloc
|
|
|
-#define dlvalloc valloc
|
|
|
-#define dlpvalloc pvalloc
|
|
|
-#define dlmallinfo mallinfo
|
|
|
-#define dlmallopt mallopt
|
|
|
-#define dlmalloc_trim malloc_trim
|
|
|
-#define dlmalloc_stats malloc_stats
|
|
|
-#define dlmalloc_usable_size malloc_usable_size
|
|
|
-#define dlmalloc_footprint malloc_footprint
|
|
|
-#define dlmalloc_max_footprint malloc_max_footprint
|
|
|
-#define dlindependent_calloc independent_calloc
|
|
|
-#define dlindependent_comalloc independent_comalloc
|
|
|
-#endif /* USE_DL_PREFIX */
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- malloc(size_t n)
|
|
|
- Returns a pointer to a newly allocated chunk of at least n bytes, or
|
|
|
- null if no space is available, in which case errno is set to ENOMEM
|
|
|
- on ANSI C systems.
|
|
|
-
|
|
|
- If n is zero, malloc returns a minimum-sized chunk. (The minimum
|
|
|
- size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
|
|
|
- systems.) Note that size_t is an unsigned type, so calls with
|
|
|
- arguments that would be negative if signed are interpreted as
|
|
|
- requests for huge amounts of space, which will often fail. The
|
|
|
- maximum supported value of n differs across systems, but is in all
|
|
|
- cases less than the maximum representable value of a size_t.
|
|
|
-*/
|
|
|
-void* dlmalloc(size_t);
|
|
|
-
|
|
|
-/*
|
|
|
- free(void* p)
|
|
|
- Releases the chunk of memory pointed to by p, that had been previously
|
|
|
- allocated using malloc or a related routine such as realloc.
|
|
|
- It has no effect if p is null. If p was not malloced or already
|
|
|
- freed, free(p) will by default cause the current program to abort.
|
|
|
-*/
|
|
|
-void dlfree(void*);
|
|
|
-
|
|
|
-/*
|
|
|
- calloc(size_t n_elements, size_t element_size);
|
|
|
- Returns a pointer to n_elements * element_size bytes, with all locations
|
|
|
- set to zero.
|
|
|
-*/
|
|
|
-void* dlcalloc(size_t, size_t);
|
|
|
-
|
|
|
-/*
|
|
|
- realloc(void* p, size_t n)
|
|
|
- Returns a pointer to a chunk of size n that contains the same data
|
|
|
- as does chunk p up to the minimum of (n, p's size) bytes, or null
|
|
|
- if no space is available.
|
|
|
-
|
|
|
- The returned pointer may or may not be the same as p. The algorithm
|
|
|
- prefers extending p in most cases when possible, otherwise it
|
|
|
- employs the equivalent of a malloc-copy-free sequence.
|
|
|
-
|
|
|
- If p is null, realloc is equivalent to malloc.
|
|
|
-
|
|
|
- If space is not available, realloc returns null, errno is set (if on
|
|
|
- ANSI) and p is NOT freed.
|
|
|
-
|
|
|
- if n is for fewer bytes than already held by p, the newly unused
|
|
|
- space is lopped off and freed if possible. realloc with a size
|
|
|
- argument of zero (re)allocates a minimum-sized chunk.
|
|
|
-
|
|
|
- The old unix realloc convention of allowing the last-free'd chunk
|
|
|
- to be used as an argument to realloc is not supported.
|
|
|
-*/
|
|
|
-
|
|
|
-void* dlrealloc(void*, size_t);
|
|
|
-
|
|
|
-/*
|
|
|
- memalign(size_t alignment, size_t n);
|
|
|
- Returns a pointer to a newly allocated chunk of n bytes, aligned
|
|
|
- in accord with the alignment argument.
|
|
|
-
|
|
|
- The alignment argument should be a power of two. If the argument is
|
|
|
- not a power of two, the nearest greater power is used.
|
|
|
- 8-byte alignment is guaranteed by normal malloc calls, so don't
|
|
|
- bother calling memalign with an argument of 8 or less.
|
|
|
-
|
|
|
- Overreliance on memalign is a sure way to fragment space.
|
|
|
-*/
|
|
|
-void* dlmemalign(size_t, size_t);
|
|
|
-
|
|
|
-/*
|
|
|
- valloc(size_t n);
|
|
|
- Equivalent to memalign(pagesize, n), where pagesize is the page
|
|
|
- size of the system. If the pagesize is unknown, 4096 is used.
|
|
|
-*/
|
|
|
-void* dlvalloc(size_t);
|
|
|
-
|
|
|
-/*
|
|
|
- mallopt(int parameter_number, int parameter_value)
|
|
|
- Sets tunable parameters The format is to provide a
|
|
|
- (parameter-number, parameter-value) pair. mallopt then sets the
|
|
|
- corresponding parameter to the argument value if it can (i.e., so
|
|
|
- long as the value is meaningful), and returns 1 if successful else
|
|
|
- 0. To workaround the fact that mallopt is specified to use int,
|
|
|
- not size_t parameters, the value -1 is specially treated as the
|
|
|
- maximum unsigned size_t value.
|
|
|
-
|
|
|
- SVID/XPG/ANSI defines four standard param numbers for mallopt,
|
|
|
- normally defined in malloc.h. None of these are use in this malloc,
|
|
|
- so setting them has no effect. But this malloc also supports other
|
|
|
- options in mallopt. See below for details. Briefly, supported
|
|
|
- parameters are as follows (listed defaults are for "typical"
|
|
|
- configurations).
|
|
|
-
|
|
|
- Symbol param # default allowed param values
|
|
|
- M_TRIM_THRESHOLD -1 2*1024*1024 any (-1 disables)
|
|
|
- M_GRANULARITY -2 page size any power of 2 >= page size
|
|
|
- M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
|
|
|
-*/
|
|
|
-int dlmallopt(int, int);
|
|
|
-
|
|
|
-/*
|
|
|
- malloc_footprint();
|
|
|
- Returns the number of bytes obtained from the system. The total
|
|
|
- number of bytes allocated by malloc, realloc etc., is less than this
|
|
|
- value. Unlike mallinfo, this function returns only a precomputed
|
|
|
- result, so can be called frequently to monitor memory consumption.
|
|
|
- Even if locks are otherwise defined, this function does not use them,
|
|
|
- so results might not be up to date.
|
|
|
-*/
|
|
|
-size_t dlmalloc_footprint(void);
|
|
|
-
|
|
|
-/*
|
|
|
- malloc_max_footprint();
|
|
|
- Returns the maximum number of bytes obtained from the system. This
|
|
|
- value will be greater than current footprint if deallocated space
|
|
|
- has been reclaimed by the system. The peak number of bytes allocated
|
|
|
- by malloc, realloc etc., is less than this value. Unlike mallinfo,
|
|
|
- this function returns only a precomputed result, so can be called
|
|
|
- frequently to monitor memory consumption. Even if locks are
|
|
|
- otherwise defined, this function does not use them, so results might
|
|
|
- not be up to date.
|
|
|
-*/
|
|
|
-size_t dlmalloc_max_footprint(void);
|
|
|
-
|
|
|
-#if !NO_MALLINFO
|
|
|
-/*
|
|
|
- mallinfo()
|
|
|
- Returns (by copy) a struct containing various summary statistics:
|
|
|
-
|
|
|
- arena: current total non-mmapped bytes allocated from system
|
|
|
- ordblks: the number of free chunks
|
|
|
- smblks: always zero.
|
|
|
- hblks: current number of mmapped regions
|
|
|
- hblkhd: total bytes held in mmapped regions
|
|
|
- usmblks: the maximum total allocated space. This will be greater
|
|
|
- than current total if trimming has occurred.
|
|
|
- fsmblks: always zero
|
|
|
- uordblks: current total allocated space (normal or mmapped)
|
|
|
- fordblks: total free space
|
|
|
- keepcost: the maximum number of bytes that could ideally be released
|
|
|
- back to system via malloc_trim. ("ideally" means that
|
|
|
- it ignores page restrictions etc.)
|
|
|
-
|
|
|
- Because these fields are ints, but internal bookkeeping may
|
|
|
- be kept as longs, the reported values may wrap around zero and
|
|
|
- thus be inaccurate.
|
|
|
-*/
|
|
|
-struct mallinfo dlmallinfo(void);
|
|
|
-#endif /* NO_MALLINFO */
|
|
|
-
|
|
|
-/*
|
|
|
- independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
|
|
|
-
|
|
|
- independent_calloc is similar to calloc, but instead of returning a
|
|
|
- single cleared space, it returns an array of pointers to n_elements
|
|
|
- independent elements that can hold contents of size elem_size, each
|
|
|
- of which starts out cleared, and can be independently freed,
|
|
|
- realloc'ed etc. The elements are guaranteed to be adjacently
|
|
|
- allocated (this is not guaranteed to occur with multiple callocs or
|
|
|
- mallocs), which may also improve cache locality in some
|
|
|
- applications.
|
|
|
-
|
|
|
- The "chunks" argument is optional (i.e., may be null, which is
|
|
|
- probably the most typical usage). If it is null, the returned array
|
|
|
- is itself dynamically allocated and should also be freed when it is
|
|
|
- no longer needed. Otherwise, the chunks array must be of at least
|
|
|
- n_elements in length. It is filled in with the pointers to the
|
|
|
- chunks.
|
|
|
-
|
|
|
- In either case, independent_calloc returns this pointer array, or
|
|
|
- null if the allocation failed. If n_elements is zero and "chunks"
|
|
|
- is null, it returns a chunk representing an array with zero elements
|
|
|
- (which should be freed if not wanted).
|
|
|
-
|
|
|
- Each element must be individually freed when it is no longer
|
|
|
- needed. If you'd like to instead be able to free all at once, you
|
|
|
- should instead use regular calloc and assign pointers into this
|
|
|
- space to represent elements. (In this case though, you cannot
|
|
|
- independently free elements.)
|
|
|
-
|
|
|
- independent_calloc simplifies and speeds up implementations of many
|
|
|
- kinds of pools. It may also be useful when constructing large data
|
|
|
- structures that initially have a fixed number of fixed-sized nodes,
|
|
|
- but the number is not known at compile time, and some of the nodes
|
|
|
- may later need to be freed. For example:
|
|
|
-
|
|
|
- struct Node { int item; struct Node* next; };
|
|
|
-
|
|
|
- struct Node* build_list() {
|
|
|
- struct Node** pool;
|
|
|
- int n = read_number_of_nodes_needed();
|
|
|
- if (n <= 0) return 0;
|
|
|
- pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
|
|
|
- if (pool == 0) die();
|
|
|
- // organize into a linked list...
|
|
|
- struct Node* first = pool[0];
|
|
|
- for (i = 0; i < n-1; ++i)
|
|
|
- pool[i]->next = pool[i+1];
|
|
|
- free(pool); // Can now free the array (or not, if it is needed later)
|
|
|
- return first;
|
|
|
- }
|
|
|
-*/
|
|
|
-void** dlindependent_calloc(size_t, size_t, void**);
|
|
|
-
|
|
|
-/*
|
|
|
- independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
|
|
|
-
|
|
|
- independent_comalloc allocates, all at once, a set of n_elements
|
|
|
- chunks with sizes indicated in the "sizes" array. It returns
|
|
|
- an array of pointers to these elements, each of which can be
|
|
|
- independently freed, realloc'ed etc. The elements are guaranteed to
|
|
|
- be adjacently allocated (this is not guaranteed to occur with
|
|
|
- multiple callocs or mallocs), which may also improve cache locality
|
|
|
- in some applications.
|
|
|
-
|
|
|
- The "chunks" argument is optional (i.e., may be null). If it is null
|
|
|
- the returned array is itself dynamically allocated and should also
|
|
|
- be freed when it is no longer needed. Otherwise, the chunks array
|
|
|
- must be of at least n_elements in length. It is filled in with the
|
|
|
- pointers to the chunks.
|
|
|
-
|
|
|
- In either case, independent_comalloc returns this pointer array, or
|
|
|
- null if the allocation failed. If n_elements is zero and chunks is
|
|
|
- null, it returns a chunk representing an array with zero elements
|
|
|
- (which should be freed if not wanted).
|
|
|
-
|
|
|
- Each element must be individually freed when it is no longer
|
|
|
- needed. If you'd like to instead be able to free all at once, you
|
|
|
- should instead use a single regular malloc, and assign pointers at
|
|
|
- particular offsets in the aggregate space. (In this case though, you
|
|
|
- cannot independently free elements.)
|
|
|
-
|
|
|
- independent_comallac differs from independent_calloc in that each
|
|
|
- element may have a different size, and also that it does not
|
|
|
- automatically clear elements.
|
|
|
-
|
|
|
- independent_comalloc can be used to speed up allocation in cases
|
|
|
- where several structs or objects must always be allocated at the
|
|
|
- same time. For example:
|
|
|
-
|
|
|
- struct Head { ... }
|
|
|
- struct Foot { ... }
|
|
|
-
|
|
|
- void send_message(char* msg) {
|
|
|
- int msglen = strlen(msg);
|
|
|
- size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
|
|
|
- void* chunks[3];
|
|
|
- if (independent_comalloc(3, sizes, chunks) == 0)
|
|
|
- die();
|
|
|
- struct Head* head = (struct Head*)(chunks[0]);
|
|
|
- char* body = (char*)(chunks[1]);
|
|
|
- struct Foot* foot = (struct Foot*)(chunks[2]);
|
|
|
- // ...
|
|
|
- }
|
|
|
-
|
|
|
- In general though, independent_comalloc is worth using only for
|
|
|
- larger values of n_elements. For small values, you probably won't
|
|
|
- detect enough difference from series of malloc calls to bother.
|
|
|
-
|
|
|
- Overuse of independent_comalloc can increase overall memory usage,
|
|
|
- since it cannot reuse existing noncontiguous small chunks that
|
|
|
- might be available for some of the elements.
|
|
|
-*/
|
|
|
-void** dlindependent_comalloc(size_t, size_t*, void**);
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- pvalloc(size_t n);
|
|
|
- Equivalent to valloc(minimum-page-that-holds(n)), that is,
|
|
|
- round up n to nearest pagesize.
|
|
|
- */
|
|
|
-void* dlpvalloc(size_t);
|
|
|
-
|
|
|
-/*
|
|
|
- malloc_trim(size_t pad);
|
|
|
-
|
|
|
- If possible, gives memory back to the system (via negative arguments
|
|
|
- to sbrk) if there is unused memory at the `high' end of the malloc
|
|
|
- pool or in unused MMAP segments. You can call this after freeing
|
|
|
- large blocks of memory to potentially reduce the system-level memory
|
|
|
- requirements of a program. However, it cannot guarantee to reduce
|
|
|
- memory. Under some allocation patterns, some large free blocks of
|
|
|
- memory will be locked between two used chunks, so they cannot be
|
|
|
- given back to the system.
|
|
|
-
|
|
|
- The `pad' argument to malloc_trim represents the amount of free
|
|
|
- trailing space to leave untrimmed. If this argument is zero, only
|
|
|
- the minimum amount of memory to maintain internal data structures
|
|
|
- will be left. Non-zero arguments can be supplied to maintain enough
|
|
|
- trailing space to service future expected allocations without having
|
|
|
- to re-obtain memory from the system.
|
|
|
-
|
|
|
- Malloc_trim returns 1 if it actually released any memory, else 0.
|
|
|
-*/
|
|
|
-int dlmalloc_trim(size_t);
|
|
|
-
|
|
|
-/*
|
|
|
- malloc_stats();
|
|
|
- Prints on stderr the amount of space obtained from the system (both
|
|
|
- via sbrk and mmap), the maximum amount (which may be more than
|
|
|
- current if malloc_trim and/or munmap got called), and the current
|
|
|
- number of bytes allocated via malloc (or realloc, etc) but not yet
|
|
|
- freed. Note that this is the number of bytes allocated, not the
|
|
|
- number requested. It will be larger than the number requested
|
|
|
- because of alignment and bookkeeping overhead. Because it includes
|
|
|
- alignment wastage as being in use, this figure may be greater than
|
|
|
- zero even when no user-level chunks are allocated.
|
|
|
-
|
|
|
- The reported current and maximum system memory can be inaccurate if
|
|
|
- a program makes other calls to system memory allocation functions
|
|
|
- (normally sbrk) outside of malloc.
|
|
|
-
|
|
|
- malloc_stats prints only the most commonly interesting statistics.
|
|
|
- More information can be obtained by calling mallinfo.
|
|
|
-*/
|
|
|
-void dlmalloc_stats(void);
|
|
|
-
|
|
|
-#endif /* ONLY_MSPACES */
|
|
|
-
|
|
|
-/*
|
|
|
- malloc_usable_size(void* p);
|
|
|
-
|
|
|
- Returns the number of bytes you can actually use in
|
|
|
- an allocated chunk, which may be more than you requested (although
|
|
|
- often not) due to alignment and minimum size constraints.
|
|
|
- You can use this many bytes without worrying about
|
|
|
- overwriting other allocated objects. This is not a particularly great
|
|
|
- programming practice. malloc_usable_size can be more useful in
|
|
|
- debugging and assertions, for example:
|
|
|
-
|
|
|
- p = malloc(n);
|
|
|
- assert(malloc_usable_size(p) >= 256);
|
|
|
-*/
|
|
|
-size_t dlmalloc_usable_size(void*);
|
|
|
-
|
|
|
-
|
|
|
-#if MSPACES
|
|
|
-
|
|
|
-/*
|
|
|
- mspace is an opaque type representing an independent
|
|
|
- region of space that supports mspace_malloc, etc.
|
|
|
-*/
|
|
|
-typedef void* mspace;
|
|
|
-
|
|
|
-/*
|
|
|
- create_mspace creates and returns a new independent space with the
|
|
|
- given initial capacity, or, if 0, the default granularity size. It
|
|
|
- returns null if there is no system memory available to create the
|
|
|
- space. If argument locked is non-zero, the space uses a separate
|
|
|
- lock to control access. The capacity of the space will grow
|
|
|
- dynamically as needed to service mspace_malloc requests. You can
|
|
|
- control the sizes of incremental increases of this space by
|
|
|
- compiling with a different DEFAULT_GRANULARITY or dynamically
|
|
|
- setting with mallopt(M_GRANULARITY, value).
|
|
|
-*/
|
|
|
-mspace create_mspace(size_t capacity, int locked);
|
|
|
-
|
|
|
-/*
|
|
|
- destroy_mspace destroys the given space, and attempts to return all
|
|
|
- of its memory back to the system, returning the total number of
|
|
|
- bytes freed. After destruction, the results of access to all memory
|
|
|
- used by the space become undefined.
|
|
|
-*/
|
|
|
-size_t destroy_mspace(mspace msp);
|
|
|
-
|
|
|
-/*
|
|
|
- create_mspace_with_base uses the memory supplied as the initial base
|
|
|
- of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
|
|
|
- space is used for bookkeeping, so the capacity must be at least this
|
|
|
- large. (Otherwise 0 is returned.) When this initial space is
|
|
|
- exhausted, additional memory will be obtained from the system.
|
|
|
- Destroying this space will deallocate all additionally allocated
|
|
|
- space (if possible) but not the initial base.
|
|
|
-*/
|
|
|
-mspace create_mspace_with_base(void* base, size_t capacity, int locked);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_track_large_chunks controls whether requests for large chunks
|
|
|
- are allocated in their own untracked mmapped regions, separate from
|
|
|
- others in this mspace. By default large chunks are not tracked,
|
|
|
- which reduces fragmentation. However, such chunks are not
|
|
|
- necessarily released to the system upon destroy_mspace. Enabling
|
|
|
- tracking by setting to true may increase fragmentation, but avoids
|
|
|
- leakage when relying on destroy_mspace to release all memory
|
|
|
- allocated using this space. The function returns the previous
|
|
|
- setting.
|
|
|
-*/
|
|
|
-int mspace_track_large_chunks(mspace msp, int enable);
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_malloc behaves as malloc, but operates within
|
|
|
- the given space.
|
|
|
-*/
|
|
|
-void* mspace_malloc(mspace msp, size_t bytes);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_free behaves as free, but operates within
|
|
|
- the given space.
|
|
|
-
|
|
|
- If compiled with FOOTERS==1, mspace_free is not actually needed.
|
|
|
- free may be called instead of mspace_free because freed chunks from
|
|
|
- any space are handled by their originating spaces.
|
|
|
-*/
|
|
|
-void mspace_free(mspace msp, void* mem);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_realloc behaves as realloc, but operates within
|
|
|
- the given space.
|
|
|
-
|
|
|
- If compiled with FOOTERS==1, mspace_realloc is not actually
|
|
|
- needed. realloc may be called instead of mspace_realloc because
|
|
|
- realloced chunks from any space are handled by their originating
|
|
|
- spaces.
|
|
|
-*/
|
|
|
-void* mspace_realloc(mspace msp, void* mem, size_t newsize);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_calloc behaves as calloc, but operates within
|
|
|
- the given space.
|
|
|
-*/
|
|
|
-void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_memalign behaves as memalign, but operates within
|
|
|
- the given space.
|
|
|
-*/
|
|
|
-void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_independent_calloc behaves as independent_calloc, but
|
|
|
- operates within the given space.
|
|
|
-*/
|
|
|
-void** mspace_independent_calloc(mspace msp, size_t n_elements,
|
|
|
- size_t elem_size, void* chunks[]);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_independent_comalloc behaves as independent_comalloc, but
|
|
|
- operates within the given space.
|
|
|
-*/
|
|
|
-void** mspace_independent_comalloc(mspace msp, size_t n_elements,
|
|
|
- size_t sizes[], void* chunks[]);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_footprint() returns the number of bytes obtained from the
|
|
|
- system for this space.
|
|
|
-*/
|
|
|
-size_t mspace_footprint(mspace msp);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_max_footprint() returns the peak number of bytes obtained from the
|
|
|
- system for this space.
|
|
|
-*/
|
|
|
-size_t mspace_max_footprint(mspace msp);
|
|
|
-
|
|
|
-
|
|
|
-#if !NO_MALLINFO
|
|
|
-/*
|
|
|
- mspace_mallinfo behaves as mallinfo, but reports properties of
|
|
|
- the given space.
|
|
|
-*/
|
|
|
-struct mallinfo mspace_mallinfo(mspace msp);
|
|
|
-#endif /* NO_MALLINFO */
|
|
|
-
|
|
|
-/*
|
|
|
- malloc_usable_size(void* p) behaves the same as malloc_usable_size;
|
|
|
-*/
|
|
|
- size_t mspace_usable_size(void* mem);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_malloc_stats behaves as malloc_stats, but reports
|
|
|
- properties of the given space.
|
|
|
-*/
|
|
|
-void mspace_malloc_stats(mspace msp);
|
|
|
-
|
|
|
-/*
|
|
|
- mspace_trim behaves as malloc_trim, but
|
|
|
- operates within the given space.
|
|
|
-*/
|
|
|
-int mspace_trim(mspace msp, size_t pad);
|
|
|
-
|
|
|
-/*
|
|
|
- An alias for mallopt.
|
|
|
-*/
|
|
|
-int mspace_mallopt(int, int);
|
|
|
-
|
|
|
-#endif /* MSPACES */
|
|
|
-
|
|
|
-#ifdef __cplusplus
|
|
|
-} /* end of extern "C" */
|
|
|
-#endif /* __cplusplus */
|
|
|
-
|
|
|
-/*
|
|
|
- ========================================================================
|
|
|
- To make a fully customizable malloc.h header file, cut everything
|
|
|
- above this line, put into file malloc.h, edit to suit, and #include it
|
|
|
- on the next line, as well as in programs that use this malloc.
|
|
|
- ========================================================================
|
|
|
-*/
|
|
|
-
|
|
|
-/* #include "malloc.h" */
|
|
|
-
|
|
|
-/*------------------------------ internal #includes ---------------------- */
|
|
|
-
|
|
|
-#ifdef WIN32
|
|
|
-#pragma warning( disable : 4146 ) /* no "unsigned" warnings */
|
|
|
-#endif /* WIN32 */
|
|
|
-
|
|
|
-#include <stdio.h> /* for printing in malloc_stats */
|
|
|
-
|
|
|
-#ifndef LACKS_ERRNO_H
|
|
|
-#include <errno.h> /* for MALLOC_FAILURE_ACTION */
|
|
|
-#endif /* LACKS_ERRNO_H */
|
|
|
-#if FOOTERS || DEBUG
|
|
|
-#include <time.h> /* for magic initialization */
|
|
|
-#endif /* FOOTERS */
|
|
|
-#ifndef LACKS_STDLIB_H
|
|
|
-#include <stdlib.h> /* for abort() */
|
|
|
-#endif /* LACKS_STDLIB_H */
|
|
|
-#ifdef DEBUG
|
|
|
-#if ABORT_ON_ASSERT_FAILURE
|
|
|
-#undef assert
|
|
|
-#define assert(x) if(!(x)) ABORT
|
|
|
-#else /* ABORT_ON_ASSERT_FAILURE */
|
|
|
-#include <assert.h>
|
|
|
-#endif /* ABORT_ON_ASSERT_FAILURE */
|
|
|
-#else /* DEBUG */
|
|
|
-#ifndef assert
|
|
|
-#define assert(x)
|
|
|
-#endif
|
|
|
-#define DEBUG 0
|
|
|
-#endif /* DEBUG */
|
|
|
-#ifndef LACKS_STRING_H
|
|
|
-#include <string.h> /* for memset etc */
|
|
|
-#endif /* LACKS_STRING_H */
|
|
|
-#if USE_BUILTIN_FFS
|
|
|
-#ifndef LACKS_STRINGS_H
|
|
|
-#include <strings.h> /* for ffs */
|
|
|
-#endif /* LACKS_STRINGS_H */
|
|
|
-#endif /* USE_BUILTIN_FFS */
|
|
|
-#if HAVE_MMAP
|
|
|
-#ifndef LACKS_SYS_MMAN_H
|
|
|
-/* On some versions of linux, mremap decl in mman.h needs __USE_GNU set */
|
|
|
-#if (defined(linux) && !defined(__USE_GNU))
|
|
|
-#define __USE_GNU 1
|
|
|
-#include <sys/mman.h> /* for mmap */
|
|
|
-#undef __USE_GNU
|
|
|
-#else
|
|
|
-#include <sys/mman.h> /* for mmap */
|
|
|
-#endif /* linux */
|
|
|
-#endif /* LACKS_SYS_MMAN_H */
|
|
|
-#ifndef LACKS_FCNTL_H
|
|
|
-#include <fcntl.h>
|
|
|
-#endif /* LACKS_FCNTL_H */
|
|
|
-#endif /* HAVE_MMAP */
|
|
|
-#ifndef LACKS_UNISTD_H
|
|
|
-#include <unistd.h> /* for sbrk, sysconf */
|
|
|
-#else /* LACKS_UNISTD_H */
|
|
|
-#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
|
|
|
-extern void* sbrk(ptrdiff_t);
|
|
|
-#endif /* FreeBSD etc */
|
|
|
-#endif /* LACKS_UNISTD_H */
|
|
|
-
|
|
|
-/* Declarations for locking */
|
|
|
-#if USE_LOCKS
|
|
|
-#ifndef WIN32
|
|
|
-#include <pthread.h>
|
|
|
-#if defined (__SVR4) && defined (__sun) /* solaris */
|
|
|
-#include <thread.h>
|
|
|
-#endif /* solaris */
|
|
|
-#else
|
|
|
-#ifndef _M_AMD64
|
|
|
-/* These are already defined on AMD64 builds */
|
|
|
-#ifdef __cplusplus
|
|
|
-extern "C" {
|
|
|
-#endif /* __cplusplus */
|
|
|
-LONG __cdecl _InterlockedCompareExchange(LONG volatile *Dest, LONG Exchange, LONG Comp);
|
|
|
-LONG __cdecl _InterlockedExchange(LONG volatile *Target, LONG Value);
|
|
|
-#ifdef __cplusplus
|
|
|
-}
|
|
|
-#endif /* __cplusplus */
|
|
|
-#endif /* _M_AMD64 */
|
|
|
-#pragma intrinsic (_InterlockedCompareExchange)
|
|
|
-#pragma intrinsic (_InterlockedExchange)
|
|
|
-#define interlockedcompareexchange _InterlockedCompareExchange
|
|
|
-#define interlockedexchange _InterlockedExchange
|
|
|
-#endif /* Win32 */
|
|
|
-#endif /* USE_LOCKS */
|
|
|
-
|
|
|
-/* Declarations for bit scanning on win32 */
|
|
|
-#if defined(_MSC_VER) && _MSC_VER>=1300
|
|
|
-#ifndef BitScanForward /* Try to avoid pulling in WinNT.h */
|
|
|
-#ifdef __cplusplus
|
|
|
-extern "C" {
|
|
|
-#endif /* __cplusplus */
|
|
|
-unsigned char _BitScanForward(unsigned long *index, unsigned long mask);
|
|
|
-unsigned char _BitScanReverse(unsigned long *index, unsigned long mask);
|
|
|
-#ifdef __cplusplus
|
|
|
-}
|
|
|
-#endif /* __cplusplus */
|
|
|
-
|
|
|
-#define BitScanForward _BitScanForward
|
|
|
-#define BitScanReverse _BitScanReverse
|
|
|
-#pragma intrinsic(_BitScanForward)
|
|
|
-#pragma intrinsic(_BitScanReverse)
|
|
|
-#endif /* BitScanForward */
|
|
|
-#endif /* defined(_MSC_VER) && _MSC_VER>=1300 */
|
|
|
-
|
|
|
-#ifndef WIN32
|
|
|
-#ifndef malloc_getpagesize
|
|
|
-# ifdef _SC_PAGESIZE /* some SVR4 systems omit an underscore */
|
|
|
-# ifndef _SC_PAGE_SIZE
|
|
|
-# define _SC_PAGE_SIZE _SC_PAGESIZE
|
|
|
-# endif
|
|
|
-# endif
|
|
|
-# ifdef _SC_PAGE_SIZE
|
|
|
-# define malloc_getpagesize sysconf(_SC_PAGE_SIZE)
|
|
|
-# else
|
|
|
-# if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE)
|
|
|
- extern size_t getpagesize();
|
|
|
-# define malloc_getpagesize getpagesize()
|
|
|
-# else
|
|
|
-# ifdef WIN32 /* use supplied emulation of getpagesize */
|
|
|
-# define malloc_getpagesize getpagesize()
|
|
|
-# else
|
|
|
-# ifndef LACKS_SYS_PARAM_H
|
|
|
-# include <sys/param.h>
|
|
|
-# endif
|
|
|
-# ifdef EXEC_PAGESIZE
|
|
|
-# define malloc_getpagesize EXEC_PAGESIZE
|
|
|
-# else
|
|
|
-# ifdef NBPG
|
|
|
-# ifndef CLSIZE
|
|
|
-# define malloc_getpagesize NBPG
|
|
|
-# else
|
|
|
-# define malloc_getpagesize (NBPG * CLSIZE)
|
|
|
-# endif
|
|
|
-# else
|
|
|
-# ifdef NBPC
|
|
|
-# define malloc_getpagesize NBPC
|
|
|
-# else
|
|
|
-# ifdef PAGESIZE
|
|
|
-# define malloc_getpagesize PAGESIZE
|
|
|
-# else /* just guess */
|
|
|
-# define malloc_getpagesize ((size_t)4096U)
|
|
|
-# endif
|
|
|
-# endif
|
|
|
-# endif
|
|
|
-# endif
|
|
|
-# endif
|
|
|
-# endif
|
|
|
-# endif
|
|
|
-#endif
|
|
|
-#endif
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
-/* ------------------- size_t and alignment properties -------------------- */
|
|
|
-
|
|
|
-/* The byte and bit size of a size_t */
|
|
|
-#define SIZE_T_SIZE (sizeof(size_t))
|
|
|
-#define SIZE_T_BITSIZE (sizeof(size_t) << 3)
|
|
|
-
|
|
|
-/* Some constants coerced to size_t */
|
|
|
-/* Annoying but necessary to avoid errors on some platforms */
|
|
|
-#define SIZE_T_ZERO ((size_t)0)
|
|
|
-#define SIZE_T_ONE ((size_t)1)
|
|
|
-#define SIZE_T_TWO ((size_t)2)
|
|
|
-#define SIZE_T_FOUR ((size_t)4)
|
|
|
-#define TWO_SIZE_T_SIZES (SIZE_T_SIZE<<1)
|
|
|
-#define FOUR_SIZE_T_SIZES (SIZE_T_SIZE<<2)
|
|
|
-#define SIX_SIZE_T_SIZES (FOUR_SIZE_T_SIZES+TWO_SIZE_T_SIZES)
|
|
|
-#define HALF_MAX_SIZE_T (MAX_SIZE_T / 2U)
|
|
|
-
|
|
|
-/* The bit mask value corresponding to MALLOC_ALIGNMENT */
|
|
|
-#define CHUNK_ALIGN_MASK (MALLOC_ALIGNMENT - SIZE_T_ONE)
|
|
|
-
|
|
|
-/* True if address a has acceptable alignment */
|
|
|
-#define is_aligned(A) (((size_t)((A)) & (CHUNK_ALIGN_MASK)) == 0)
|
|
|
-
|
|
|
-/* the number of bytes to offset an address to align it */
|
|
|
-#define align_offset(A)\
|
|
|
- ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\
|
|
|
- ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK))
|
|
|
-
|
|
|
-/*
|
|
|
- malloc_params holds global properties, including those that can be
|
|
|
- dynamically set using mallopt. There is a single instance, mparams,
|
|
|
- initialized in init_mparams. Note that the non-zeroness of "magic"
|
|
|
- also serves as an initialization flag.
|
|
|
-*/
|
|
|
-typedef unsigned int flag_t;
|
|
|
-struct malloc_params {
|
|
|
- volatile size_t magic;
|
|
|
- size_t page_size;
|
|
|
- size_t granularity;
|
|
|
- size_t mmap_threshold;
|
|
|
- size_t trim_threshold;
|
|
|
- flag_t default_mflags;
|
|
|
-};
|
|
|
-
|
|
|
-static struct malloc_params mparams;
|
|
|
-
|
|
|
-/* Ensure mparams initialized */
|
|
|
-#define ensure_initialization() (void)(mparams.magic != 0 || init_mparams())
|
|
|
-
|
|
|
-/* -------------------------- MMAP preliminaries ------------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- If HAVE_MORECORE or HAVE_MMAP are false, we just define calls and
|
|
|
- checks to fail so compiler optimizer can delete code rather than
|
|
|
- using so many "#if"s.
|
|
|
-*/
|
|
|
-
|
|
|
-
|
|
|
-/* MORECORE and MMAP must return MFAIL on failure */
|
|
|
-#define MFAIL ((void*)(MAX_SIZE_T))
|
|
|
-#define CMFAIL ((char*)(MFAIL)) /* defined for convenience */
|
|
|
-
|
|
|
-#if HAVE_MMAP
|
|
|
-
|
|
|
-#ifndef WIN32
|
|
|
-#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
|
|
|
-#define MAP_ANONYMOUS MAP_ANON
|
|
|
-#endif /* MAP_ANON */
|
|
|
-#ifdef DEFAULT_GRANULARITY_ALIGNED
|
|
|
-#define MMAP_IMPL mmap_aligned
|
|
|
-static void* lastAlignedmmap; /* Used as a hint */
|
|
|
-static void* mmap_aligned(void *start, size_t length, int prot, int flags, int fd, off_t offset) {
|
|
|
- void* baseaddress = 0;
|
|
|
- void* ptr = 0;
|
|
|
- if(!start) {
|
|
|
- baseaddress = lastAlignedmmap;
|
|
|
- for(;;) {
|
|
|
- if(baseaddress) flags|=MAP_FIXED;
|
|
|
- ptr = mmap(baseaddress, length, prot, flags, fd, offset);
|
|
|
- if(!ptr)
|
|
|
- baseaddress = (void*)((size_t)baseaddress + mparams.granularity);
|
|
|
- else if((size_t)ptr & (mparams.granularity - SIZE_T_ONE)) {
|
|
|
- munmap(ptr, length);
|
|
|
- baseaddress = (void*)(((size_t)ptr + mparams.granularity) & ~(mparams.granularity - SIZE_T_ONE));
|
|
|
- }
|
|
|
- else break;
|
|
|
- }
|
|
|
- }
|
|
|
- else ptr = mmap(start, length, prot, flags, fd, offset);
|
|
|
- if(ptr) lastAlignedmmap = (void*)((size_t) ptr + mparams.granularity);
|
|
|
- return ptr;
|
|
|
-}
|
|
|
-#else
|
|
|
-#define MMAP_IMPL mmap
|
|
|
-#endif /* DEFAULT_GRANULARITY_ALIGNED */
|
|
|
-#define MUNMAP_DEFAULT(a, s) munmap((a), (s))
|
|
|
-#define MMAP_PROT (PROT_READ|PROT_WRITE)
|
|
|
-#ifdef MAP_ANONYMOUS
|
|
|
-#define MMAP_FLAGS (MAP_PRIVATE|MAP_ANONYMOUS)
|
|
|
-#define MMAP_DEFAULT(s) MMAP_IMPL(0, (s), MMAP_PROT, MMAP_FLAGS, -1, 0)
|
|
|
-#else /* MAP_ANONYMOUS */
|
|
|
-/*
|
|
|
- Nearly all versions of mmap support MAP_ANONYMOUS, so the following
|
|
|
- is unlikely to be needed, but is supplied just in case.
|
|
|
-*/
|
|
|
-#define MMAP_FLAGS (MAP_PRIVATE)
|
|
|
-static int dev_zero_fd = -1; /* Cached file descriptor for /dev/zero. */
|
|
|
-#define MMAP_DEFAULT(s) ((dev_zero_fd < 0) ? \
|
|
|
- (dev_zero_fd = open("/dev/zero", O_RDWR), \
|
|
|
- MMAP_IMPL(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) : \
|
|
|
- MMAP_IMPL(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0))
|
|
|
-#endif /* MAP_ANONYMOUS */
|
|
|
-
|
|
|
-#define DIRECT_MMAP_DEFAULT(s) MMAP_DEFAULT(s)
|
|
|
-
|
|
|
-#else /* WIN32 */
|
|
|
-
|
|
|
-/* Win32 MMAP via VirtualAlloc */
|
|
|
-#ifdef DEFAULT_GRANULARITY_ALIGNED
|
|
|
-static void* lastWin32mmap; /* Used as a hint */
|
|
|
-#endif /* DEFAULT_GRANULARITY_ALIGNED */
|
|
|
-#ifdef ENABLE_LARGE_PAGES
|
|
|
-static int largepagesavailable = 1;
|
|
|
-#endif /* ENABLE_LARGE_PAGES */
|
|
|
-static FORCEINLINE void* win32mmap(size_t size) {
|
|
|
- void* baseaddress = 0;
|
|
|
- void* ptr = 0;
|
|
|
-#ifdef ENABLE_LARGE_PAGES
|
|
|
- /* Note that large pages are *always* allocated on a large page boundary.
|
|
|
- If however granularity is small then don't waste a kernel call if size
|
|
|
- isn't around the size of a large page */
|
|
|
- if(largepagesavailable && size >= 1*1024*1024) {
|
|
|
- ptr = VirtualAlloc(baseaddress, size, MEM_RESERVE|MEM_COMMIT|MEM_LARGE_PAGES, PAGE_READWRITE);
|
|
|
- if(!ptr && ERROR_PRIVILEGE_NOT_HELD==GetLastError()) largepagesavailable=0;
|
|
|
- }
|
|
|
-#endif
|
|
|
- if(!ptr) {
|
|
|
-#ifdef DEFAULT_GRANULARITY_ALIGNED
|
|
|
- /* We try to avoid overhead by speculatively reserving at aligned
|
|
|
- addresses until we succeed */
|
|
|
- baseaddress = lastWin32mmap;
|
|
|
- for(;;) {
|
|
|
- void* reserveaddr = VirtualAlloc(baseaddress, size, MEM_RESERVE, PAGE_READWRITE);
|
|
|
- if(!reserveaddr)
|
|
|
- baseaddress = (void*)((size_t)baseaddress + mparams.granularity);
|
|
|
- else if((size_t)reserveaddr & (mparams.granularity - SIZE_T_ONE)) {
|
|
|
- VirtualFree(reserveaddr, 0, MEM_RELEASE);
|
|
|
- baseaddress = (void*)(((size_t)reserveaddr + mparams.granularity) & ~(mparams.granularity - SIZE_T_ONE));
|
|
|
- }
|
|
|
- else break;
|
|
|
- }
|
|
|
-#endif
|
|
|
- if(!ptr) ptr = VirtualAlloc(baseaddress, size, baseaddress ? MEM_COMMIT : MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
|
|
|
-#if DEBUG
|
|
|
- if(lastWin32mmap && ptr!=lastWin32mmap) printf("Non-contiguous VirtualAlloc between %p and %p\n", ptr, lastWin32mmap);
|
|
|
-#endif
|
|
|
-#ifdef DEFAULT_GRANULARITY_ALIGNED
|
|
|
- if(ptr) lastWin32mmap = (void*)((size_t) ptr + mparams.granularity);
|
|
|
-#endif
|
|
|
- }
|
|
|
-#if DEBUG
|
|
|
-#ifdef ENABLE_LARGE_PAGES
|
|
|
- printf("VirtualAlloc returns %p size %u. LargePagesAvailable=%d\n", ptr, size, largepagesavailable);
|
|
|
-#else
|
|
|
- printf("VirtualAlloc returns %p size %u\n", ptr, size);
|
|
|
-#endif
|
|
|
-#endif
|
|
|
- return (ptr != 0)? ptr: MFAIL;
|
|
|
-}
|
|
|
-
|
|
|
-/* For direct MMAP, use MEM_TOP_DOWN to minimize interference */
|
|
|
-static FORCEINLINE void* win32direct_mmap(size_t size) {
|
|
|
- void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN,
|
|
|
- PAGE_READWRITE);
|
|
|
- return (ptr != 0)? ptr: MFAIL;
|
|
|
-}
|
|
|
-
|
|
|
-/* This function supports releasing coalesed segments */
|
|
|
-static FORCEINLINE int win32munmap(void* ptr, size_t size) {
|
|
|
- MEMORY_BASIC_INFORMATION minfo;
|
|
|
- char* cptr = (char*)ptr;
|
|
|
- while (size) {
|
|
|
- if (VirtualQuery(cptr, &minfo, sizeof(minfo)) == 0)
|
|
|
- return -1;
|
|
|
- if (minfo.BaseAddress != cptr || minfo.AllocationBase != cptr ||
|
|
|
- minfo.State != MEM_COMMIT || minfo.RegionSize > size)
|
|
|
- return -1;
|
|
|
- if (VirtualFree(cptr, 0, MEM_RELEASE) == 0)
|
|
|
- return -1;
|
|
|
- cptr += minfo.RegionSize;
|
|
|
- size -= minfo.RegionSize;
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-#define MMAP_DEFAULT(s) win32mmap(s)
|
|
|
-#define MUNMAP_DEFAULT(a, s) win32munmap((a), (s))
|
|
|
-#define DIRECT_MMAP_DEFAULT(s) win32direct_mmap(s)
|
|
|
-#endif /* WIN32 */
|
|
|
-#endif /* HAVE_MMAP */
|
|
|
-
|
|
|
-#if HAVE_MREMAP
|
|
|
-#ifndef WIN32
|
|
|
-#define MREMAP_DEFAULT(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv))
|
|
|
-#endif /* WIN32 */
|
|
|
-#endif /* HAVE_MREMAP */
|
|
|
-
|
|
|
-
|
|
|
-/**
|
|
|
- * Define CALL_MORECORE
|
|
|
- */
|
|
|
-#if HAVE_MORECORE
|
|
|
- #ifdef MORECORE
|
|
|
- #define CALL_MORECORE(S) MORECORE(S)
|
|
|
- #else /* MORECORE */
|
|
|
- #define CALL_MORECORE(S) MORECORE_DEFAULT(S)
|
|
|
- #endif /* MORECORE */
|
|
|
-#else /* HAVE_MORECORE */
|
|
|
- #define CALL_MORECORE(S) MFAIL
|
|
|
-#endif /* HAVE_MORECORE */
|
|
|
-
|
|
|
-/**
|
|
|
- * Define CALL_MMAP/CALL_MUNMAP/CALL_DIRECT_MMAP
|
|
|
- */
|
|
|
-#if HAVE_MMAP
|
|
|
- #define USE_MMAP_BIT (SIZE_T_ONE)
|
|
|
-
|
|
|
- #ifdef MMAP
|
|
|
- #define CALL_MMAP(s) MMAP(s)
|
|
|
- #else /* MMAP */
|
|
|
- #define CALL_MMAP(s) MMAP_DEFAULT(s)
|
|
|
- #endif /* MMAP */
|
|
|
- #ifdef MUNMAP
|
|
|
- #define CALL_MUNMAP(a, s) MUNMAP((a), (s))
|
|
|
- #else /* MUNMAP */
|
|
|
- #define CALL_MUNMAP(a, s) MUNMAP_DEFAULT((a), (s))
|
|
|
- #endif /* MUNMAP */
|
|
|
- #ifdef DIRECT_MMAP
|
|
|
- #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)
|
|
|
- #else /* DIRECT_MMAP */
|
|
|
- #define CALL_DIRECT_MMAP(s) DIRECT_MMAP_DEFAULT(s)
|
|
|
- #endif /* DIRECT_MMAP */
|
|
|
-#else /* HAVE_MMAP */
|
|
|
- #define USE_MMAP_BIT (SIZE_T_ZERO)
|
|
|
-
|
|
|
- #define MMAP(s) MFAIL
|
|
|
- #define MUNMAP(a, s) (-1)
|
|
|
- #define DIRECT_MMAP(s) MFAIL
|
|
|
- #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)
|
|
|
- #define CALL_MMAP(s) MMAP(s)
|
|
|
- #define CALL_MUNMAP(a, s) MUNMAP((a), (s))
|
|
|
-#endif /* HAVE_MMAP */
|
|
|
-
|
|
|
-/**
|
|
|
- * Define CALL_MREMAP
|
|
|
- */
|
|
|
-#if HAVE_MMAP && HAVE_MREMAP
|
|
|
- #ifdef MREMAP
|
|
|
- #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP((addr), (osz), (nsz), (mv))
|
|
|
- #else /* MREMAP */
|
|
|
- #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP_DEFAULT((addr), (osz), (nsz), (mv))
|
|
|
- #endif /* MREMAP */
|
|
|
-#else /* HAVE_MMAP && HAVE_MREMAP */
|
|
|
- #define CALL_MREMAP(addr, osz, nsz, mv) MFAIL
|
|
|
-#endif /* HAVE_MMAP && HAVE_MREMAP */
|
|
|
-
|
|
|
-/* mstate bit set if continguous morecore disabled or failed */
|
|
|
-#define USE_NONCONTIGUOUS_BIT (4U)
|
|
|
-
|
|
|
-/* segment bit set in create_mspace_with_base */
|
|
|
-#define EXTERN_BIT (8U)
|
|
|
-
|
|
|
-
|
|
|
-/* --------------------------- Lock preliminaries ------------------------ */
|
|
|
-
|
|
|
-/*
|
|
|
- When locks are defined, there is one global lock, plus
|
|
|
- one per-mspace lock.
|
|
|
-
|
|
|
- The global lock_ensures that mparams.magic and other unique
|
|
|
- mparams values are initialized only once. It also protects
|
|
|
- sequences of calls to MORECORE. In many cases sys_alloc requires
|
|
|
- two calls, that should not be interleaved with calls by other
|
|
|
- threads. This does not protect against direct calls to MORECORE
|
|
|
- by other threads not using this lock, so there is still code to
|
|
|
- cope the best we can on interference.
|
|
|
-
|
|
|
- Per-mspace locks surround calls to malloc, free, etc. To enable use
|
|
|
- in layered extensions, per-mspace locks are reentrant.
|
|
|
-
|
|
|
- Because lock-protected regions generally have bounded times, it is
|
|
|
- OK to use the supplied simple spinlocks in the custom versions for
|
|
|
- x86. Spinlocks are likely to improve performance for lightly
|
|
|
- contended applications, but worsen performance under heavy
|
|
|
- contention.
|
|
|
-
|
|
|
- If USE_LOCKS is > 1, the definitions of lock routines here are
|
|
|
- bypassed, in which case you will need to define the type MLOCK_T,
|
|
|
- and at least INITIAL_LOCK, ACQUIRE_LOCK, RELEASE_LOCK and possibly
|
|
|
- TRY_LOCK (which is not used in this malloc, but commonly needed in
|
|
|
- extensions.) You must also declare a
|
|
|
- static MLOCK_T malloc_global_mutex = { initialization values };.
|
|
|
-
|
|
|
-*/
|
|
|
-
|
|
|
-#if USE_LOCKS == 1
|
|
|
-
|
|
|
-#if USE_SPIN_LOCKS && SPIN_LOCKS_AVAILABLE
|
|
|
-#ifndef WIN32
|
|
|
-
|
|
|
-/* Custom pthread-style spin locks on x86 and x64 for gcc */
|
|
|
-struct pthread_mlock_t {
|
|
|
- volatile unsigned int l;
|
|
|
- char cachelinepadding[64];
|
|
|
- unsigned int c;
|
|
|
- pthread_t threadid;
|
|
|
-};
|
|
|
-#define MLOCK_T struct pthread_mlock_t
|
|
|
-#define CURRENT_THREAD pthread_self()
|
|
|
-#define INITIAL_LOCK(sl) ((sl)->threadid = 0, (sl)->l = (sl)->c = 0, 0)
|
|
|
-#define ACQUIRE_LOCK(sl) pthread_acquire_lock(sl)
|
|
|
-#define RELEASE_LOCK(sl) pthread_release_lock(sl)
|
|
|
-#define TRY_LOCK(sl) pthread_try_lock(sl)
|
|
|
-#define SPINS_PER_YIELD 63
|
|
|
-
|
|
|
-static MLOCK_T malloc_global_mutex = { 0, "", 0, 0};
|
|
|
-
|
|
|
-static FORCEINLINE int pthread_acquire_lock (MLOCK_T *sl) {
|
|
|
- int spins = 0;
|
|
|
- volatile unsigned int* lp = &sl->l;
|
|
|
- for (;;) {
|
|
|
- if (*lp != 0) {
|
|
|
- if (sl->threadid == CURRENT_THREAD) {
|
|
|
- ++sl->c;
|
|
|
- return 0;
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- /* place args to cmpxchgl in locals to evade oddities in some gccs */
|
|
|
- int cmp = 0;
|
|
|
- int val = 1;
|
|
|
- int ret;
|
|
|
- __asm__ __volatile__ ("lock; cmpxchgl %1, %2"
|
|
|
- : "=a" (ret)
|
|
|
- : "r" (val), "m" (*(lp)), "0"(cmp)
|
|
|
- : "memory", "cc");
|
|
|
- if (!ret) {
|
|
|
- assert(!sl->threadid);
|
|
|
- sl->threadid = CURRENT_THREAD;
|
|
|
- sl->c = 1;
|
|
|
- return 0;
|
|
|
- }
|
|
|
- }
|
|
|
- if ((++spins & SPINS_PER_YIELD) == 0) {
|
|
|
-#if defined (__SVR4) && defined (__sun) /* solaris */
|
|
|
- thr_yield();
|
|
|
-#else
|
|
|
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
|
|
|
- sched_yield();
|
|
|
-#else /* no-op yield on unknown systems */
|
|
|
- ;
|
|
|
-#endif /* __linux__ || __FreeBSD__ || __APPLE__ */
|
|
|
-#endif /* solaris */
|
|
|
- }
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-static FORCEINLINE void pthread_release_lock (MLOCK_T *sl) {
|
|
|
- volatile unsigned int* lp = &sl->l;
|
|
|
- assert(*lp != 0);
|
|
|
- assert(sl->threadid == CURRENT_THREAD);
|
|
|
- if (--sl->c == 0) {
|
|
|
- sl->threadid = 0;
|
|
|
- int prev = 0;
|
|
|
- int ret;
|
|
|
- __asm__ __volatile__ ("lock; xchgl %0, %1"
|
|
|
- : "=r" (ret)
|
|
|
- : "m" (*(lp)), "0"(prev)
|
|
|
- : "memory");
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-static FORCEINLINE int pthread_try_lock (MLOCK_T *sl) {
|
|
|
- volatile unsigned int* lp = &sl->l;
|
|
|
- if (*lp != 0) {
|
|
|
- if (sl->threadid == CURRENT_THREAD) {
|
|
|
- ++sl->c;
|
|
|
- return 1;
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- int cmp = 0;
|
|
|
- int val = 1;
|
|
|
- int ret;
|
|
|
- __asm__ __volatile__ ("lock; cmpxchgl %1, %2"
|
|
|
- : "=a" (ret)
|
|
|
- : "r" (val), "m" (*(lp)), "0"(cmp)
|
|
|
- : "memory", "cc");
|
|
|
- if (!ret) {
|
|
|
- assert(!sl->threadid);
|
|
|
- sl->threadid = CURRENT_THREAD;
|
|
|
- sl->c = 1;
|
|
|
- return 1;
|
|
|
- }
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-#else /* WIN32 */
|
|
|
-/* Custom win32-style spin locks on x86 and x64 for MSC */
|
|
|
-struct win32_mlock_t {
|
|
|
- volatile long l;
|
|
|
- char cachelinepadding[64];
|
|
|
- unsigned int c;
|
|
|
- long threadid;
|
|
|
-};
|
|
|
-
|
|
|
-#define MLOCK_T struct win32_mlock_t
|
|
|
-#define CURRENT_THREAD ((long)GetCurrentThreadId())
|
|
|
-#define INITIAL_LOCK(sl) ((sl)->threadid = 0, (sl)->l = (sl)->c = 0, 0)
|
|
|
-#define ACQUIRE_LOCK(sl) win32_acquire_lock(sl)
|
|
|
-#define RELEASE_LOCK(sl) win32_release_lock(sl)
|
|
|
-#define TRY_LOCK(sl) win32_try_lock(sl)
|
|
|
-#define SPINS_PER_YIELD 63
|
|
|
-
|
|
|
-static MLOCK_T malloc_global_mutex = { 0, 0, 0};
|
|
|
-
|
|
|
-static FORCEINLINE int win32_acquire_lock (MLOCK_T *sl) {
|
|
|
- int spins = 0;
|
|
|
- for (;;) {
|
|
|
- if (sl->l != 0) {
|
|
|
- if (sl->threadid == CURRENT_THREAD) {
|
|
|
- ++sl->c;
|
|
|
- return 0;
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- if (!interlockedexchange(&sl->l, 1)) {
|
|
|
- assert(!sl->threadid);
|
|
|
- sl->threadid = CURRENT_THREAD;
|
|
|
- sl->c = 1;
|
|
|
- return 0;
|
|
|
- }
|
|
|
- }
|
|
|
- if ((++spins & SPINS_PER_YIELD) == 0)
|
|
|
- SleepEx(0, FALSE);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-static FORCEINLINE void win32_release_lock (MLOCK_T *sl) {
|
|
|
- assert(sl->threadid == CURRENT_THREAD);
|
|
|
- assert(sl->l != 0);
|
|
|
- if (--sl->c == 0) {
|
|
|
- sl->threadid = 0;
|
|
|
- interlockedexchange (&sl->l, 0);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-static FORCEINLINE int win32_try_lock (MLOCK_T *sl) {
|
|
|
- if (sl->l != 0) {
|
|
|
- if (sl->threadid == CURRENT_THREAD) {
|
|
|
- ++sl->c;
|
|
|
- return 1;
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- if (!interlockedexchange(&sl->l, 1)){
|
|
|
- assert(!sl->threadid);
|
|
|
- sl->threadid = CURRENT_THREAD;
|
|
|
- sl->c = 1;
|
|
|
- return 1;
|
|
|
- }
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-#endif /* WIN32 */
|
|
|
-#else /* USE_SPIN_LOCKS */
|
|
|
-
|
|
|
-#ifndef WIN32
|
|
|
-/* pthreads-based locks */
|
|
|
-
|
|
|
-#define MLOCK_T pthread_mutex_t
|
|
|
-#define CURRENT_THREAD pthread_self()
|
|
|
-#define INITIAL_LOCK(sl) pthread_init_lock(sl)
|
|
|
-#define ACQUIRE_LOCK(sl) pthread_mutex_lock(sl)
|
|
|
-#define RELEASE_LOCK(sl) pthread_mutex_unlock(sl)
|
|
|
-#define TRY_LOCK(sl) (!pthread_mutex_trylock(sl))
|
|
|
-
|
|
|
-static MLOCK_T malloc_global_mutex = PTHREAD_MUTEX_INITIALIZER;
|
|
|
-
|
|
|
-/* Cope with old-style linux recursive lock initialization by adding */
|
|
|
-/* skipped internal declaration from pthread.h */
|
|
|
-#ifdef linux
|
|
|
-#ifndef PTHREAD_MUTEX_RECURSIVE
|
|
|
-extern int pthread_mutexattr_setkind_np __P ((pthread_mutexattr_t *__attr,
|
|
|
- int __kind));
|
|
|
-#define PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
|
|
|
-#define pthread_mutexattr_settype(x,y) pthread_mutexattr_setkind_np(x,y)
|
|
|
-#endif
|
|
|
-#endif
|
|
|
-
|
|
|
-static int pthread_init_lock (MLOCK_T *sl) {
|
|
|
- pthread_mutexattr_t attr;
|
|
|
- if (pthread_mutexattr_init(&attr)) return 1;
|
|
|
- if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE)) return 1;
|
|
|
- if (pthread_mutex_init(sl, &attr)) return 1;
|
|
|
- if (pthread_mutexattr_destroy(&attr)) return 1;
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-#else /* WIN32 */
|
|
|
-/* Win32 critical sections */
|
|
|
-#define MLOCK_T CRITICAL_SECTION
|
|
|
-#define CURRENT_THREAD GetCurrentThreadId()
|
|
|
-#define INITIAL_LOCK(s) (!InitializeCriticalSectionAndSpinCount((s), 0x80000000|4000))
|
|
|
-#define ACQUIRE_LOCK(s) (EnterCriticalSection(sl), 0)
|
|
|
-#define RELEASE_LOCK(s) LeaveCriticalSection(sl)
|
|
|
-#define TRY_LOCK(s) TryEnterCriticalSection(sl)
|
|
|
-#define NEED_GLOBAL_LOCK_INIT
|
|
|
-
|
|
|
-static MLOCK_T malloc_global_mutex;
|
|
|
-static volatile long malloc_global_mutex_status;
|
|
|
-
|
|
|
-/* Use spin loop to initialize global lock */
|
|
|
-static void init_malloc_global_mutex() {
|
|
|
- for (;;) {
|
|
|
- long stat = malloc_global_mutex_status;
|
|
|
- if (stat > 0)
|
|
|
- return;
|
|
|
- /* transition to < 0 while initializing, then to > 0) */
|
|
|
- if (stat == 0 &&
|
|
|
- interlockedcompareexchange(&malloc_global_mutex_status, -1, 0) == 0) {
|
|
|
- InitializeCriticalSection(&malloc_global_mutex);
|
|
|
- interlockedexchange(&malloc_global_mutex_status,1);
|
|
|
- return;
|
|
|
- }
|
|
|
- SleepEx(0, FALSE);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-#endif /* WIN32 */
|
|
|
-#endif /* USE_SPIN_LOCKS */
|
|
|
-#endif /* USE_LOCKS == 1 */
|
|
|
-
|
|
|
-/* ----------------------- User-defined locks ------------------------ */
|
|
|
-
|
|
|
-#if USE_LOCKS > 1
|
|
|
-/* Define your own lock implementation here */
|
|
|
-/* #define INITIAL_LOCK(sl) ... */
|
|
|
-/* #define ACQUIRE_LOCK(sl) ... */
|
|
|
-/* #define RELEASE_LOCK(sl) ... */
|
|
|
-/* #define TRY_LOCK(sl) ... */
|
|
|
-/* static MLOCK_T malloc_global_mutex = ... */
|
|
|
-#endif /* USE_LOCKS > 1 */
|
|
|
-
|
|
|
-/* ----------------------- Lock-based state ------------------------ */
|
|
|
-
|
|
|
-#if USE_LOCKS
|
|
|
-#define USE_LOCK_BIT (2U)
|
|
|
-#else /* USE_LOCKS */
|
|
|
-#define USE_LOCK_BIT (0U)
|
|
|
-#define INITIAL_LOCK(l)
|
|
|
-#endif /* USE_LOCKS */
|
|
|
-
|
|
|
-#if USE_LOCKS
|
|
|
-#ifndef ACQUIRE_MALLOC_GLOBAL_LOCK
|
|
|
-#define ACQUIRE_MALLOC_GLOBAL_LOCK() ACQUIRE_LOCK(&malloc_global_mutex);
|
|
|
-#endif
|
|
|
-#ifndef RELEASE_MALLOC_GLOBAL_LOCK
|
|
|
-#define RELEASE_MALLOC_GLOBAL_LOCK() RELEASE_LOCK(&malloc_global_mutex);
|
|
|
-#endif
|
|
|
-#else /* USE_LOCKS */
|
|
|
-#define ACQUIRE_MALLOC_GLOBAL_LOCK()
|
|
|
-#define RELEASE_MALLOC_GLOBAL_LOCK()
|
|
|
-#endif /* USE_LOCKS */
|
|
|
-
|
|
|
-
|
|
|
-/* ----------------------- Chunk representations ------------------------ */
|
|
|
-
|
|
|
-/*
|
|
|
- (The following includes lightly edited explanations by Colin Plumb.)
|
|
|
-
|
|
|
- The malloc_chunk declaration below is misleading (but accurate and
|
|
|
- necessary). It declares a "view" into memory allowing access to
|
|
|
- necessary fields at known offsets from a given base.
|
|
|
-
|
|
|
- Chunks of memory are maintained using a `boundary tag' method as
|
|
|
- originally described by Knuth. (See the paper by Paul Wilson
|
|
|
- ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a survey of such
|
|
|
- techniques.) Sizes of free chunks are stored both in the front of
|
|
|
- each chunk and at the end. This makes consolidating fragmented
|
|
|
- chunks into bigger chunks fast. The head fields also hold bits
|
|
|
- representing whether chunks are free or in use.
|
|
|
-
|
|
|
- Here are some pictures to make it clearer. They are "exploded" to
|
|
|
- show that the state of a chunk can be thought of as extending from
|
|
|
- the high 31 bits of the head field of its header through the
|
|
|
- prev_foot and PINUSE_BIT bit of the following chunk header.
|
|
|
-
|
|
|
- A chunk that's in use looks like:
|
|
|
-
|
|
|
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Size of previous chunk (if P = 0) |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
|
|
|
- | Size of this chunk 1| +-+
|
|
|
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | |
|
|
|
- +- -+
|
|
|
- | |
|
|
|
- +- -+
|
|
|
- | :
|
|
|
- +- size - sizeof(size_t) available payload bytes -+
|
|
|
- : |
|
|
|
- chunk-> +- -+
|
|
|
- | |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|
|
|
|
- | Size of next chunk (may or may not be in use) | +-+
|
|
|
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
-
|
|
|
- And if it's free, it looks like this:
|
|
|
-
|
|
|
- chunk-> +- -+
|
|
|
- | User payload (must be in use, or we would have merged!) |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
|
|
|
- | Size of this chunk 0| +-+
|
|
|
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Next pointer |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Prev pointer |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | :
|
|
|
- +- size - sizeof(struct chunk) unused bytes -+
|
|
|
- : |
|
|
|
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Size of this chunk |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|
|
|
|
- | Size of next chunk (must be in use, or we would have merged)| +-+
|
|
|
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | :
|
|
|
- +- User payload -+
|
|
|
- : |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- |0|
|
|
|
- +-+
|
|
|
- Note that since we always merge adjacent free chunks, the chunks
|
|
|
- adjacent to a free chunk must be in use.
|
|
|
-
|
|
|
- Given a pointer to a chunk (which can be derived trivially from the
|
|
|
- payload pointer) we can, in O(1) time, find out whether the adjacent
|
|
|
- chunks are free, and if so, unlink them from the lists that they
|
|
|
- are on and merge them with the current chunk.
|
|
|
-
|
|
|
- Chunks always begin on even word boundaries, so the mem portion
|
|
|
- (which is returned to the user) is also on an even word boundary, and
|
|
|
- thus at least double-word aligned.
|
|
|
-
|
|
|
- The P (PINUSE_BIT) bit, stored in the unused low-order bit of the
|
|
|
- chunk size (which is always a multiple of two words), is an in-use
|
|
|
- bit for the *previous* chunk. If that bit is *clear*, then the
|
|
|
- word before the current chunk size contains the previous chunk
|
|
|
- size, and can be used to find the front of the previous chunk.
|
|
|
- The very first chunk allocated always has this bit set, preventing
|
|
|
- access to non-existent (or non-owned) memory. If pinuse is set for
|
|
|
- any given chunk, then you CANNOT determine the size of the
|
|
|
- previous chunk, and might even get a memory addressing fault when
|
|
|
- trying to do so.
|
|
|
-
|
|
|
- The C (CINUSE_BIT) bit, stored in the unused second-lowest bit of
|
|
|
- the chunk size redundantly records whether the current chunk is
|
|
|
- inuse (unless the chunk is mmapped). This redundancy enables usage
|
|
|
- checks within free and realloc, and reduces indirection when freeing
|
|
|
- and consolidating chunks.
|
|
|
-
|
|
|
- Each freshly allocated chunk must have both cinuse and pinuse set.
|
|
|
- That is, each allocated chunk borders either a previously allocated
|
|
|
- and still in-use chunk, or the base of its memory arena. This is
|
|
|
- ensured by making all allocations from the the `lowest' part of any
|
|
|
- found chunk. Further, no free chunk physically borders another one,
|
|
|
- so each free chunk is known to be preceded and followed by either
|
|
|
- inuse chunks or the ends of memory.
|
|
|
-
|
|
|
- Note that the `foot' of the current chunk is actually represented
|
|
|
- as the prev_foot of the NEXT chunk. This makes it easier to
|
|
|
- deal with alignments etc but can be very confusing when trying
|
|
|
- to extend or adapt this code.
|
|
|
-
|
|
|
- The exceptions to all this are
|
|
|
-
|
|
|
- 1. The special chunk `top' is the top-most available chunk (i.e.,
|
|
|
- the one bordering the end of available memory). It is treated
|
|
|
- specially. Top is never included in any bin, is used only if
|
|
|
- no other chunk is available, and is released back to the
|
|
|
- system if it is very large (see M_TRIM_THRESHOLD). In effect,
|
|
|
- the top chunk is treated as larger (and thus less well
|
|
|
- fitting) than any other available chunk. The top chunk
|
|
|
- doesn't update its trailing size field since there is no next
|
|
|
- contiguous chunk that would have to index off it. However,
|
|
|
- space is still allocated for it (TOP_FOOT_SIZE) to enable
|
|
|
- separation or merging when space is extended.
|
|
|
-
|
|
|
- 3. Chunks allocated via mmap, have both cinuse and pinuse bits
|
|
|
- cleared in their head fields. Because they are allocated
|
|
|
- one-by-one, each must carry its own prev_foot field, which is
|
|
|
- also used to hold the offset this chunk has within its mmapped
|
|
|
- region, which is needed to preserve alignment. Each mmapped
|
|
|
- chunk is trailed by the first two fields of a fake next-chunk
|
|
|
- for sake of usage checks.
|
|
|
-
|
|
|
-*/
|
|
|
-
|
|
|
-struct malloc_chunk {
|
|
|
- size_t prev_foot; /* Size of previous chunk (if free). */
|
|
|
- size_t head; /* Size and inuse bits. */
|
|
|
- struct malloc_chunk* fd; /* double links -- used only if free. */
|
|
|
- struct malloc_chunk* bk;
|
|
|
-};
|
|
|
-
|
|
|
-typedef struct malloc_chunk mchunk;
|
|
|
-typedef struct malloc_chunk* mchunkptr;
|
|
|
-typedef struct malloc_chunk* sbinptr; /* The type of bins of chunks */
|
|
|
-typedef unsigned int bindex_t; /* Described below */
|
|
|
-typedef unsigned int binmap_t; /* Described below */
|
|
|
-
|
|
|
-/* ------------------- Chunks sizes and alignments ----------------------- */
|
|
|
-
|
|
|
-#define MCHUNK_SIZE (sizeof(mchunk))
|
|
|
-
|
|
|
-#if FOOTERS
|
|
|
-#define CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
|
|
|
-#else /* FOOTERS */
|
|
|
-#define CHUNK_OVERHEAD (SIZE_T_SIZE)
|
|
|
-#endif /* FOOTERS */
|
|
|
-
|
|
|
-/* MMapped chunks need a second word of overhead ... */
|
|
|
-#define MMAP_CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
|
|
|
-/* ... and additional padding for fake next-chunk at foot */
|
|
|
-#define MMAP_FOOT_PAD (FOUR_SIZE_T_SIZES)
|
|
|
-
|
|
|
-/* The smallest size we can malloc is an aligned minimal chunk */
|
|
|
-#define MIN_CHUNK_SIZE\
|
|
|
- ((MCHUNK_SIZE + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
|
|
|
-
|
|
|
-/* conversion from malloc headers to user pointers, and back */
|
|
|
-#define chunk2mem(p) ((void*)((char*)(p) + TWO_SIZE_T_SIZES))
|
|
|
-#define mem2chunk(mem) ((mchunkptr)((char*)(mem) - TWO_SIZE_T_SIZES))
|
|
|
-/* chunk associated with aligned address A */
|
|
|
-#define align_as_chunk(A) (mchunkptr)((A) + align_offset(chunk2mem(A)))
|
|
|
-
|
|
|
-/* Bounds on request (not chunk) sizes. */
|
|
|
-#define MAX_REQUEST ((-MIN_CHUNK_SIZE) << 2)
|
|
|
-#define MIN_REQUEST (MIN_CHUNK_SIZE - CHUNK_OVERHEAD - SIZE_T_ONE)
|
|
|
-
|
|
|
-/* pad request bytes into a usable size */
|
|
|
-#define pad_request(req) \
|
|
|
- (((req) + CHUNK_OVERHEAD + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
|
|
|
-
|
|
|
-/* pad request, checking for minimum (but not maximum) */
|
|
|
-#define request2size(req) \
|
|
|
- (((req) < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(req))
|
|
|
-
|
|
|
-
|
|
|
-/* ------------------ Operations on head and foot fields ----------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- The head field of a chunk is or'ed with PINUSE_BIT when previous
|
|
|
- adjacent chunk in use, and or'ed with CINUSE_BIT if this chunk is in
|
|
|
- use, unless mmapped, in which case both bits are cleared.
|
|
|
-
|
|
|
- FLAG4_BIT is not used by this malloc, but might be useful in extensions.
|
|
|
-*/
|
|
|
-
|
|
|
-#define PINUSE_BIT (SIZE_T_ONE)
|
|
|
-#define CINUSE_BIT (SIZE_T_TWO)
|
|
|
-#define FLAG4_BIT (SIZE_T_FOUR)
|
|
|
-#define INUSE_BITS (PINUSE_BIT|CINUSE_BIT)
|
|
|
-#define FLAG_BITS (PINUSE_BIT|CINUSE_BIT|FLAG4_BIT)
|
|
|
-
|
|
|
-/* Head value for fenceposts */
|
|
|
-#define FENCEPOST_HEAD (INUSE_BITS|SIZE_T_SIZE)
|
|
|
-
|
|
|
-/* extraction of fields from head words */
|
|
|
-#define cinuse(p) ((p)->head & CINUSE_BIT)
|
|
|
-#define pinuse(p) ((p)->head & PINUSE_BIT)
|
|
|
-#define is_inuse(p) (((p)->head & INUSE_BITS) != PINUSE_BIT)
|
|
|
-#define is_mmapped(p) (((p)->head & INUSE_BITS) == 0)
|
|
|
-
|
|
|
-#define chunksize(p) ((p)->head & ~(FLAG_BITS))
|
|
|
-
|
|
|
-#define clear_pinuse(p) ((p)->head &= ~PINUSE_BIT)
|
|
|
-
|
|
|
-/* Treat space at ptr +/- offset as a chunk */
|
|
|
-#define chunk_plus_offset(p, s) ((mchunkptr)(((char*)(p)) + (s)))
|
|
|
-#define chunk_minus_offset(p, s) ((mchunkptr)(((char*)(p)) - (s)))
|
|
|
-
|
|
|
-/* Ptr to next or previous physical malloc_chunk. */
|
|
|
-#define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->head & ~FLAG_BITS)))
|
|
|
-#define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) ))
|
|
|
-
|
|
|
-/* extract next chunk's pinuse bit */
|
|
|
-#define next_pinuse(p) ((next_chunk(p)->head) & PINUSE_BIT)
|
|
|
-
|
|
|
-/* Get/set size at footer */
|
|
|
-#define get_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot)
|
|
|
-#define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s))
|
|
|
-
|
|
|
-/* Set size, pinuse bit, and foot */
|
|
|
-#define set_size_and_pinuse_of_free_chunk(p, s)\
|
|
|
- ((p)->head = (s|PINUSE_BIT), set_foot(p, s))
|
|
|
-
|
|
|
-/* Set size, pinuse bit, foot, and clear next pinuse */
|
|
|
-#define set_free_with_pinuse(p, s, n)\
|
|
|
- (clear_pinuse(n), set_size_and_pinuse_of_free_chunk(p, s))
|
|
|
-
|
|
|
-/* Get the internal overhead associated with chunk p */
|
|
|
-#define overhead_for(p)\
|
|
|
- (is_mmapped(p)? MMAP_CHUNK_OVERHEAD : CHUNK_OVERHEAD)
|
|
|
-
|
|
|
-/* Return true if malloced space is not necessarily cleared */
|
|
|
-#if MMAP_CLEARS
|
|
|
-#define calloc_must_clear(p) (!is_mmapped(p))
|
|
|
-#else /* MMAP_CLEARS */
|
|
|
-#define calloc_must_clear(p) (1)
|
|
|
-#endif /* MMAP_CLEARS */
|
|
|
-
|
|
|
-/* ---------------------- Overlaid data structures ----------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- When chunks are not in use, they are treated as nodes of either
|
|
|
- lists or trees.
|
|
|
-
|
|
|
- "Small" chunks are stored in circular doubly-linked lists, and look
|
|
|
- like this:
|
|
|
-
|
|
|
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Size of previous chunk |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- `head:' | Size of chunk, in bytes |P|
|
|
|
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Forward pointer to next chunk in list |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Back pointer to previous chunk in list |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Unused space (may be 0 bytes long) .
|
|
|
- . .
|
|
|
- . |
|
|
|
-nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- `foot:' | Size of chunk, in bytes |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
-
|
|
|
- Larger chunks are kept in a form of bitwise digital trees (aka
|
|
|
- tries) keyed on chunksizes. Because malloc_tree_chunks are only for
|
|
|
- free chunks greater than 256 bytes, their size doesn't impose any
|
|
|
- constraints on user chunk sizes. Each node looks like:
|
|
|
-
|
|
|
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Size of previous chunk |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- `head:' | Size of chunk, in bytes |P|
|
|
|
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Forward pointer to next chunk of same size |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Back pointer to previous chunk of same size |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Pointer to left child (child[0]) |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Pointer to right child (child[1]) |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Pointer to parent |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | bin index of this chunk |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- | Unused space .
|
|
|
- . |
|
|
|
-nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
- `foot:' | Size of chunk, in bytes |
|
|
|
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
-
|
|
|
- Each tree holding treenodes is a tree of unique chunk sizes. Chunks
|
|
|
- of the same size are arranged in a circularly-linked list, with only
|
|
|
- the oldest chunk (the next to be used, in our FIFO ordering)
|
|
|
- actually in the tree. (Tree members are distinguished by a non-null
|
|
|
- parent pointer.) If a chunk with the same size an an existing node
|
|
|
- is inserted, it is linked off the existing node using pointers that
|
|
|
- work in the same way as fd/bk pointers of small chunks.
|
|
|
-
|
|
|
- Each tree contains a power of 2 sized range of chunk sizes (the
|
|
|
- smallest is 0x100 <= x < 0x180), which is is divided in half at each
|
|
|
- tree level, with the chunks in the smaller half of the range (0x100
|
|
|
- <= x < 0x140 for the top nose) in the left subtree and the larger
|
|
|
- half (0x140 <= x < 0x180) in the right subtree. This is, of course,
|
|
|
- done by inspecting individual bits.
|
|
|
-
|
|
|
- Using these rules, each node's left subtree contains all smaller
|
|
|
- sizes than its right subtree. However, the node at the root of each
|
|
|
- subtree has no particular ordering relationship to either. (The
|
|
|
- dividing line between the subtree sizes is based on trie relation.)
|
|
|
- If we remove the last chunk of a given size from the interior of the
|
|
|
- tree, we need to replace it with a leaf node. The tree ordering
|
|
|
- rules permit a node to be replaced by any leaf below it.
|
|
|
-
|
|
|
- The smallest chunk in a tree (a common operation in a best-fit
|
|
|
- allocator) can be found by walking a path to the leftmost leaf in
|
|
|
- the tree. Unlike a usual binary tree, where we follow left child
|
|
|
- pointers until we reach a null, here we follow the right child
|
|
|
- pointer any time the left one is null, until we reach a leaf with
|
|
|
- both child pointers null. The smallest chunk in the tree will be
|
|
|
- somewhere along that path.
|
|
|
-
|
|
|
- The worst case number of steps to add, find, or remove a node is
|
|
|
- bounded by the number of bits differentiating chunks within
|
|
|
- bins. Under current bin calculations, this ranges from 6 up to 21
|
|
|
- (for 32 bit sizes) or up to 53 (for 64 bit sizes). The typical case
|
|
|
- is of course much better.
|
|
|
-*/
|
|
|
-
|
|
|
-struct malloc_tree_chunk {
|
|
|
- /* The first four fields must be compatible with malloc_chunk */
|
|
|
- size_t prev_foot;
|
|
|
- size_t head;
|
|
|
- struct malloc_tree_chunk* fd;
|
|
|
- struct malloc_tree_chunk* bk;
|
|
|
-
|
|
|
- struct malloc_tree_chunk* child[2];
|
|
|
- struct malloc_tree_chunk* parent;
|
|
|
- bindex_t index;
|
|
|
-};
|
|
|
-
|
|
|
-typedef struct malloc_tree_chunk tchunk;
|
|
|
-typedef struct malloc_tree_chunk* tchunkptr;
|
|
|
-typedef struct malloc_tree_chunk* tbinptr; /* The type of bins of trees */
|
|
|
-
|
|
|
-/* A little helper macro for trees */
|
|
|
-#define leftmost_child(t) ((t)->child[0] != 0? (t)->child[0] : (t)->child[1])
|
|
|
-
|
|
|
-/* ----------------------------- Segments -------------------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- Each malloc space may include non-contiguous segments, held in a
|
|
|
- list headed by an embedded malloc_segment record representing the
|
|
|
- top-most space. Segments also include flags holding properties of
|
|
|
- the space. Large chunks that are directly allocated by mmap are not
|
|
|
- included in this list. They are instead independently created and
|
|
|
- destroyed without otherwise keeping track of them.
|
|
|
-
|
|
|
- Segment management mainly comes into play for spaces allocated by
|
|
|
- MMAP. Any call to MMAP might or might not return memory that is
|
|
|
- adjacent to an existing segment. MORECORE normally contiguously
|
|
|
- extends the current space, so this space is almost always adjacent,
|
|
|
- which is simpler and faster to deal with. (This is why MORECORE is
|
|
|
- used preferentially to MMAP when both are available -- see
|
|
|
- sys_alloc.) When allocating using MMAP, we don't use any of the
|
|
|
- hinting mechanisms (inconsistently) supported in various
|
|
|
- implementations of unix mmap, or distinguish reserving from
|
|
|
- committing memory. Instead, we just ask for space, and exploit
|
|
|
- contiguity when we get it. It is probably possible to do
|
|
|
- better than this on some systems, but no general scheme seems
|
|
|
- to be significantly better.
|
|
|
-
|
|
|
- Management entails a simpler variant of the consolidation scheme
|
|
|
- used for chunks to reduce fragmentation -- new adjacent memory is
|
|
|
- normally prepended or appended to an existing segment. However,
|
|
|
- there are limitations compared to chunk consolidation that mostly
|
|
|
- reflect the fact that segment processing is relatively infrequent
|
|
|
- (occurring only when getting memory from system) and that we
|
|
|
- don't expect to have huge numbers of segments:
|
|
|
-
|
|
|
- * Segments are not indexed, so traversal requires linear scans. (It
|
|
|
- would be possible to index these, but is not worth the extra
|
|
|
- overhead and complexity for most programs on most platforms.)
|
|
|
- * New segments are only appended to old ones when holding top-most
|
|
|
- memory; if they cannot be prepended to others, they are held in
|
|
|
- different segments.
|
|
|
-
|
|
|
- Except for the top-most segment of an mstate, each segment record
|
|
|
- is kept at the tail of its segment. Segments are added by pushing
|
|
|
- segment records onto the list headed by &mstate.seg for the
|
|
|
- containing mstate.
|
|
|
-
|
|
|
- Segment flags control allocation/merge/deallocation policies:
|
|
|
- * If EXTERN_BIT set, then we did not allocate this segment,
|
|
|
- and so should not try to deallocate or merge with others.
|
|
|
- (This currently holds only for the initial segment passed
|
|
|
- into create_mspace_with_base.)
|
|
|
- * If USE_MMAP_BIT set, the segment may be merged with
|
|
|
- other surrounding mmapped segments and trimmed/de-allocated
|
|
|
- using munmap.
|
|
|
- * If neither bit is set, then the segment was obtained using
|
|
|
- MORECORE so can be merged with surrounding MORECORE'd segments
|
|
|
- and deallocated/trimmed using MORECORE with negative arguments.
|
|
|
-*/
|
|
|
-
|
|
|
-struct malloc_segment {
|
|
|
- char* base; /* base address */
|
|
|
- size_t size; /* allocated size */
|
|
|
- struct malloc_segment* next; /* ptr to next segment */
|
|
|
- flag_t sflags; /* mmap and extern flag */
|
|
|
-};
|
|
|
-
|
|
|
-#define is_mmapped_segment(S) ((S)->sflags & USE_MMAP_BIT)
|
|
|
-#define is_extern_segment(S) ((S)->sflags & EXTERN_BIT)
|
|
|
-
|
|
|
-typedef struct malloc_segment msegment;
|
|
|
-typedef struct malloc_segment* msegmentptr;
|
|
|
-
|
|
|
-/* ---------------------------- malloc_state ----------------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- A malloc_state holds all of the bookkeeping for a space.
|
|
|
- The main fields are:
|
|
|
-
|
|
|
- Top
|
|
|
- The topmost chunk of the currently active segment. Its size is
|
|
|
- cached in topsize. The actual size of topmost space is
|
|
|
- topsize+TOP_FOOT_SIZE, which includes space reserved for adding
|
|
|
- fenceposts and segment records if necessary when getting more
|
|
|
- space from the system. The size at which to autotrim top is
|
|
|
- cached from mparams in trim_check, except that it is disabled if
|
|
|
- an autotrim fails.
|
|
|
-
|
|
|
- Designated victim (dv)
|
|
|
- This is the preferred chunk for servicing small requests that
|
|
|
- don't have exact fits. It is normally the chunk split off most
|
|
|
- recently to service another small request. Its size is cached in
|
|
|
- dvsize. The link fields of this chunk are not maintained since it
|
|
|
- is not kept in a bin.
|
|
|
-
|
|
|
- SmallBins
|
|
|
- An array of bin headers for free chunks. These bins hold chunks
|
|
|
- with sizes less than MIN_LARGE_SIZE bytes. Each bin contains
|
|
|
- chunks of all the same size, spaced 8 bytes apart. To simplify
|
|
|
- use in double-linked lists, each bin header acts as a malloc_chunk
|
|
|
- pointing to the real first node, if it exists (else pointing to
|
|
|
- itself). This avoids special-casing for headers. But to avoid
|
|
|
- waste, we allocate only the fd/bk pointers of bins, and then use
|
|
|
- repositioning tricks to treat these as the fields of a chunk.
|
|
|
-
|
|
|
- TreeBins
|
|
|
- Treebins are pointers to the roots of trees holding a range of
|
|
|
- sizes. There are 2 equally spaced treebins for each power of two
|
|
|
- from TREE_SHIFT to TREE_SHIFT+16. The last bin holds anything
|
|
|
- larger.
|
|
|
-
|
|
|
- Bin maps
|
|
|
- There is one bit map for small bins ("smallmap") and one for
|
|
|
- treebins ("treemap). Each bin sets its bit when non-empty, and
|
|
|
- clears the bit when empty. Bit operations are then used to avoid
|
|
|
- bin-by-bin searching -- nearly all "search" is done without ever
|
|
|
- looking at bins that won't be selected. The bit maps
|
|
|
- conservatively use 32 bits per map word, even if on 64bit system.
|
|
|
- For a good description of some of the bit-based techniques used
|
|
|
- here, see Henry S. Warren Jr's book "Hacker's Delight" (and
|
|
|
- supplement at http://hackersdelight.org/). Many of these are
|
|
|
- intended to reduce the branchiness of paths through malloc etc, as
|
|
|
- well as to reduce the number of memory locations read or written.
|
|
|
-
|
|
|
- Segments
|
|
|
- A list of segments headed by an embedded malloc_segment record
|
|
|
- representing the initial space.
|
|
|
-
|
|
|
- Address check support
|
|
|
- The least_addr field is the least address ever obtained from
|
|
|
- MORECORE or MMAP. Attempted frees and reallocs of any address less
|
|
|
- than this are trapped (unless INSECURE is defined).
|
|
|
-
|
|
|
- Magic tag
|
|
|
- A cross-check field that should always hold same value as mparams.magic.
|
|
|
-
|
|
|
- Flags
|
|
|
- Bits recording whether to use MMAP, locks, or contiguous MORECORE
|
|
|
-
|
|
|
- Statistics
|
|
|
- Each space keeps track of current and maximum system memory
|
|
|
- obtained via MORECORE or MMAP.
|
|
|
-
|
|
|
- Trim support
|
|
|
- Fields holding the amount of unused topmost memory that should trigger
|
|
|
- timming, and a counter to force periodic scanning to release unused
|
|
|
- non-topmost segments.
|
|
|
-
|
|
|
- Locking
|
|
|
- If USE_LOCKS is defined, the "mutex" lock is acquired and released
|
|
|
- around every public call using this mspace.
|
|
|
-
|
|
|
- Extension support
|
|
|
- A void* pointer and a size_t field that can be used to help implement
|
|
|
- extensions to this malloc.
|
|
|
-*/
|
|
|
-
|
|
|
-/* Bin types, widths and sizes */
|
|
|
-#define NSMALLBINS (32U)
|
|
|
-#define NTREEBINS (32U)
|
|
|
-#define SMALLBIN_SHIFT (3U)
|
|
|
-#define SMALLBIN_WIDTH (SIZE_T_ONE << SMALLBIN_SHIFT)
|
|
|
-#define TREEBIN_SHIFT (8U)
|
|
|
-#define MIN_LARGE_SIZE (SIZE_T_ONE << TREEBIN_SHIFT)
|
|
|
-#define MAX_SMALL_SIZE (MIN_LARGE_SIZE - SIZE_T_ONE)
|
|
|
-#define MAX_SMALL_REQUEST (MAX_SMALL_SIZE - CHUNK_ALIGN_MASK - CHUNK_OVERHEAD)
|
|
|
-
|
|
|
-struct malloc_state {
|
|
|
- binmap_t smallmap;
|
|
|
- binmap_t treemap;
|
|
|
- size_t dvsize;
|
|
|
- size_t topsize;
|
|
|
- char* least_addr;
|
|
|
- mchunkptr dv;
|
|
|
- mchunkptr top;
|
|
|
- size_t trim_check;
|
|
|
- size_t release_checks;
|
|
|
- size_t magic;
|
|
|
- mchunkptr smallbins[(NSMALLBINS+1)*2];
|
|
|
- tbinptr treebins[NTREEBINS];
|
|
|
- size_t footprint;
|
|
|
- size_t max_footprint;
|
|
|
- flag_t mflags;
|
|
|
- msegment seg;
|
|
|
-#if USE_LOCKS
|
|
|
- MLOCK_T mutex; /* locate lock among fields that rarely change */
|
|
|
-#endif /* USE_LOCKS */
|
|
|
- void* extp; /* Unused but available for extensions */
|
|
|
- size_t exts;
|
|
|
-};
|
|
|
-
|
|
|
-typedef struct malloc_state* mstate;
|
|
|
-
|
|
|
-/* ------------- Global malloc_state and malloc_params ------------------- */
|
|
|
-
|
|
|
-#if !ONLY_MSPACES
|
|
|
-
|
|
|
-/* The global malloc_state used for all non-"mspace" calls */
|
|
|
-static struct malloc_state _gm_;
|
|
|
-#define gm (&_gm_)
|
|
|
-#define is_global(M) ((M) == &_gm_)
|
|
|
-
|
|
|
-#endif /* !ONLY_MSPACES */
|
|
|
-
|
|
|
-#define is_initialized(M) ((M)->top != 0)
|
|
|
-
|
|
|
-/* -------------------------- system alloc setup ------------------------- */
|
|
|
-
|
|
|
-/* Operations on mflags */
|
|
|
-
|
|
|
-#define use_lock(M) ((M)->mflags & USE_LOCK_BIT)
|
|
|
-#define enable_lock(M) ((M)->mflags |= USE_LOCK_BIT)
|
|
|
-#define disable_lock(M) ((M)->mflags &= ~USE_LOCK_BIT)
|
|
|
-
|
|
|
-#define use_mmap(M) ((M)->mflags & USE_MMAP_BIT)
|
|
|
-#define enable_mmap(M) ((M)->mflags |= USE_MMAP_BIT)
|
|
|
-#define disable_mmap(M) ((M)->mflags &= ~USE_MMAP_BIT)
|
|
|
-
|
|
|
-#define use_noncontiguous(M) ((M)->mflags & USE_NONCONTIGUOUS_BIT)
|
|
|
-#define disable_contiguous(M) ((M)->mflags |= USE_NONCONTIGUOUS_BIT)
|
|
|
-
|
|
|
-#define set_lock(M,L)\
|
|
|
- ((M)->mflags = (L)?\
|
|
|
- ((M)->mflags | USE_LOCK_BIT) :\
|
|
|
- ((M)->mflags & ~USE_LOCK_BIT))
|
|
|
-
|
|
|
-/* page-align a size */
|
|
|
-#define page_align(S)\
|
|
|
- (((S) + (mparams.page_size - SIZE_T_ONE)) & ~(mparams.page_size - SIZE_T_ONE))
|
|
|
-
|
|
|
-/* granularity-align a size */
|
|
|
-#define granularity_align(S)\
|
|
|
- (((S) + (mparams.granularity - SIZE_T_ONE))\
|
|
|
- & ~(mparams.granularity - SIZE_T_ONE))
|
|
|
-
|
|
|
-
|
|
|
-/* For mmap, use granularity alignment on windows, else page-align */
|
|
|
-#ifdef WIN32
|
|
|
-#define mmap_align(S) granularity_align(S)
|
|
|
-#else
|
|
|
-#define mmap_align(S) page_align(S)
|
|
|
-#endif
|
|
|
-
|
|
|
-/* For sys_alloc, enough padding to ensure can malloc request on success */
|
|
|
-#define SYS_ALLOC_PADDING (TOP_FOOT_SIZE + MALLOC_ALIGNMENT)
|
|
|
-
|
|
|
-#define is_page_aligned(S)\
|
|
|
- (((size_t)(S) & (mparams.page_size - SIZE_T_ONE)) == 0)
|
|
|
-#define is_granularity_aligned(S)\
|
|
|
- (((size_t)(S) & (mparams.granularity - SIZE_T_ONE)) == 0)
|
|
|
-
|
|
|
-/* True if segment S holds address A */
|
|
|
-#define segment_holds(S, A)\
|
|
|
- ((char*)(A) >= S->base && (char*)(A) < S->base + S->size)
|
|
|
-
|
|
|
-/* Return segment holding given address */
|
|
|
-static msegmentptr segment_holding(mstate m, char* addr) {
|
|
|
- msegmentptr sp = &m->seg;
|
|
|
- for (;;) {
|
|
|
- if (addr >= sp->base && addr < sp->base + sp->size)
|
|
|
- return sp;
|
|
|
- if ((sp = sp->next) == 0)
|
|
|
- return 0;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Return true if segment contains a segment link */
|
|
|
-static int has_segment_link(mstate m, msegmentptr ss) {
|
|
|
- msegmentptr sp = &m->seg;
|
|
|
- for (;;) {
|
|
|
- if ((char*)sp >= ss->base && (char*)sp < ss->base + ss->size)
|
|
|
- return 1;
|
|
|
- if ((sp = sp->next) == 0)
|
|
|
- return 0;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-#ifndef MORECORE_CANNOT_TRIM
|
|
|
-#define should_trim(M,s) ((s) > (M)->trim_check)
|
|
|
-#else /* MORECORE_CANNOT_TRIM */
|
|
|
-#define should_trim(M,s) (0)
|
|
|
-#endif /* MORECORE_CANNOT_TRIM */
|
|
|
-
|
|
|
-/*
|
|
|
- TOP_FOOT_SIZE is padding at the end of a segment, including space
|
|
|
- that may be needed to place segment records and fenceposts when new
|
|
|
- noncontiguous segments are added.
|
|
|
-*/
|
|
|
-#define TOP_FOOT_SIZE\
|
|
|
- (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE)
|
|
|
-
|
|
|
-
|
|
|
-/* ------------------------------- Hooks -------------------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- PREACTION should be defined to return 0 on success, and nonzero on
|
|
|
- failure. If you are not using locking, you can redefine these to do
|
|
|
- anything you like.
|
|
|
-*/
|
|
|
-
|
|
|
-#if USE_LOCKS
|
|
|
-
|
|
|
-#define PREACTION(M) ((use_lock(M))? ACQUIRE_LOCK(&(M)->mutex) : 0)
|
|
|
-#define POSTACTION(M) { if (use_lock(M)) RELEASE_LOCK(&(M)->mutex); }
|
|
|
-#else /* USE_LOCKS */
|
|
|
-
|
|
|
-#ifndef PREACTION
|
|
|
-#define PREACTION(M) (0)
|
|
|
-#endif /* PREACTION */
|
|
|
-
|
|
|
-#ifndef POSTACTION
|
|
|
-#define POSTACTION(M)
|
|
|
-#endif /* POSTACTION */
|
|
|
-
|
|
|
-#endif /* USE_LOCKS */
|
|
|
-
|
|
|
-/*
|
|
|
- CORRUPTION_ERROR_ACTION is triggered upon detected bad addresses.
|
|
|
- USAGE_ERROR_ACTION is triggered on detected bad frees and
|
|
|
- reallocs. The argument p is an address that might have triggered the
|
|
|
- fault. It is ignored by the two predefined actions, but might be
|
|
|
- useful in custom actions that try to help diagnose errors.
|
|
|
-*/
|
|
|
-
|
|
|
-#if PROCEED_ON_ERROR
|
|
|
-
|
|
|
-/* A count of the number of corruption errors causing resets */
|
|
|
-int malloc_corruption_error_count;
|
|
|
-
|
|
|
-/* default corruption action */
|
|
|
-static void reset_on_error(mstate m);
|
|
|
-
|
|
|
-#define CORRUPTION_ERROR_ACTION(m) reset_on_error(m)
|
|
|
-#define USAGE_ERROR_ACTION(m, p)
|
|
|
-
|
|
|
-#else /* PROCEED_ON_ERROR */
|
|
|
-
|
|
|
-#ifndef CORRUPTION_ERROR_ACTION
|
|
|
-#define CORRUPTION_ERROR_ACTION(m) ABORT
|
|
|
-#endif /* CORRUPTION_ERROR_ACTION */
|
|
|
-
|
|
|
-#ifndef USAGE_ERROR_ACTION
|
|
|
-#define USAGE_ERROR_ACTION(m,p) ABORT
|
|
|
-#endif /* USAGE_ERROR_ACTION */
|
|
|
-
|
|
|
-#endif /* PROCEED_ON_ERROR */
|
|
|
-
|
|
|
-/* -------------------------- Debugging setup ---------------------------- */
|
|
|
-
|
|
|
-#if ! DEBUG
|
|
|
-
|
|
|
-#define check_free_chunk(M,P)
|
|
|
-#define check_inuse_chunk(M,P)
|
|
|
-#define check_malloced_chunk(M,P,N)
|
|
|
-#define check_mmapped_chunk(M,P)
|
|
|
-#define check_malloc_state(M)
|
|
|
-#define check_top_chunk(M,P)
|
|
|
-
|
|
|
-#else /* DEBUG */
|
|
|
-#define check_free_chunk(M,P) do_check_free_chunk(M,P)
|
|
|
-#define check_inuse_chunk(M,P) do_check_inuse_chunk(M,P)
|
|
|
-#define check_top_chunk(M,P) do_check_top_chunk(M,P)
|
|
|
-#define check_malloced_chunk(M,P,N) do_check_malloced_chunk(M,P,N)
|
|
|
-#define check_mmapped_chunk(M,P) do_check_mmapped_chunk(M,P)
|
|
|
-#define check_malloc_state(M) do_check_malloc_state(M)
|
|
|
-
|
|
|
-static void do_check_any_chunk(mstate m, mchunkptr p);
|
|
|
-static void do_check_top_chunk(mstate m, mchunkptr p);
|
|
|
-static void do_check_mmapped_chunk(mstate m, mchunkptr p);
|
|
|
-static void do_check_inuse_chunk(mstate m, mchunkptr p);
|
|
|
-static void do_check_free_chunk(mstate m, mchunkptr p);
|
|
|
-static void do_check_malloced_chunk(mstate m, void* mem, size_t s);
|
|
|
-static void do_check_tree(mstate m, tchunkptr t);
|
|
|
-static void do_check_treebin(mstate m, bindex_t i);
|
|
|
-static void do_check_smallbin(mstate m, bindex_t i);
|
|
|
-static void do_check_malloc_state(mstate m);
|
|
|
-static int bin_find(mstate m, mchunkptr x);
|
|
|
-static size_t traverse_and_check(mstate m);
|
|
|
-#endif /* DEBUG */
|
|
|
-
|
|
|
-/* ---------------------------- Indexing Bins ---------------------------- */
|
|
|
-
|
|
|
-#define is_small(s) (((s) >> SMALLBIN_SHIFT) < NSMALLBINS)
|
|
|
-#define small_index(s) (bindex_t)((s) >> SMALLBIN_SHIFT)
|
|
|
-#define small_index2size(i) ((i) << SMALLBIN_SHIFT)
|
|
|
-#define MIN_SMALL_INDEX (small_index(MIN_CHUNK_SIZE))
|
|
|
-
|
|
|
-/* addressing by index. See above about smallbin repositioning */
|
|
|
-#define smallbin_at(M, i) ((sbinptr)((char*)&((M)->smallbins[(i)<<1])))
|
|
|
-#define treebin_at(M,i) (&((M)->treebins[i]))
|
|
|
-
|
|
|
-/* assign tree index for size S to variable I. Use x86 asm if possible */
|
|
|
-#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
|
|
|
-#define compute_tree_index(S, I)\
|
|
|
-{\
|
|
|
- unsigned int X = S >> TREEBIN_SHIFT;\
|
|
|
- if (X == 0)\
|
|
|
- I = 0;\
|
|
|
- else if (X > 0xFFFF)\
|
|
|
- I = NTREEBINS-1;\
|
|
|
- else {\
|
|
|
- unsigned int K;\
|
|
|
- __asm__("bsrl\t%1, %0\n\t" : "=r" (K) : "g" (X));\
|
|
|
- I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
|
|
|
- }\
|
|
|
-}
|
|
|
-
|
|
|
-#elif defined (__INTEL_COMPILER)
|
|
|
-#define compute_tree_index(S, I)\
|
|
|
-{\
|
|
|
- size_t X = S >> TREEBIN_SHIFT;\
|
|
|
- if (X == 0)\
|
|
|
- I = 0;\
|
|
|
- else if (X > 0xFFFF)\
|
|
|
- I = NTREEBINS-1;\
|
|
|
- else {\
|
|
|
- unsigned int K = _bit_scan_reverse (X); \
|
|
|
- I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
|
|
|
- }\
|
|
|
-}
|
|
|
-
|
|
|
-#elif defined(_MSC_VER) && _MSC_VER>=1300
|
|
|
-#define compute_tree_index(S, I)\
|
|
|
-{\
|
|
|
- size_t X = S >> TREEBIN_SHIFT;\
|
|
|
- if (X == 0)\
|
|
|
- I = 0;\
|
|
|
- else if (X > 0xFFFF)\
|
|
|
- I = NTREEBINS-1;\
|
|
|
- else {\
|
|
|
- unsigned int K;\
|
|
|
- _BitScanReverse((DWORD *) &K, (DWORD) X);\
|
|
|
- I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
|
|
|
- }\
|
|
|
-}
|
|
|
-
|
|
|
-#else /* GNUC */
|
|
|
-#define compute_tree_index(S, I)\
|
|
|
-{\
|
|
|
- size_t X = S >> TREEBIN_SHIFT;\
|
|
|
- if (X == 0)\
|
|
|
- I = 0;\
|
|
|
- else if (X > 0xFFFF)\
|
|
|
- I = NTREEBINS-1;\
|
|
|
- else {\
|
|
|
- unsigned int Y = (unsigned int)X;\
|
|
|
- unsigned int N = ((Y - 0x100) >> 16) & 8;\
|
|
|
- unsigned int K = (((Y <<= N) - 0x1000) >> 16) & 4;\
|
|
|
- N += K;\
|
|
|
- N += K = (((Y <<= K) - 0x4000) >> 16) & 2;\
|
|
|
- K = 14 - N + ((Y <<= K) >> 15);\
|
|
|
- I = (K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1));\
|
|
|
- }\
|
|
|
-}
|
|
|
-#endif /* GNUC */
|
|
|
-
|
|
|
-/* Bit representing maximum resolved size in a treebin at i */
|
|
|
-#define bit_for_tree_index(i) \
|
|
|
- (i == NTREEBINS-1)? (SIZE_T_BITSIZE-1) : (((i) >> 1) + TREEBIN_SHIFT - 2)
|
|
|
-
|
|
|
-/* Shift placing maximum resolved bit in a treebin at i as sign bit */
|
|
|
-#define leftshift_for_tree_index(i) \
|
|
|
- ((i == NTREEBINS-1)? 0 : \
|
|
|
- ((SIZE_T_BITSIZE-SIZE_T_ONE) - (((i) >> 1) + TREEBIN_SHIFT - 2)))
|
|
|
-
|
|
|
-/* The size of the smallest chunk held in bin with index i */
|
|
|
-#define minsize_for_tree_index(i) \
|
|
|
- ((SIZE_T_ONE << (((i) >> 1) + TREEBIN_SHIFT)) | \
|
|
|
- (((size_t)((i) & SIZE_T_ONE)) << (((i) >> 1) + TREEBIN_SHIFT - 1)))
|
|
|
-
|
|
|
-
|
|
|
-/* ------------------------ Operations on bin maps ----------------------- */
|
|
|
-
|
|
|
-/* bit corresponding to given index */
|
|
|
-#define idx2bit(i) ((binmap_t)(1) << (i))
|
|
|
-
|
|
|
-/* Mark/Clear bits with given index */
|
|
|
-#define mark_smallmap(M,i) ((M)->smallmap |= idx2bit(i))
|
|
|
-#define clear_smallmap(M,i) ((M)->smallmap &= ~idx2bit(i))
|
|
|
-#define smallmap_is_marked(M,i) ((M)->smallmap & idx2bit(i))
|
|
|
-
|
|
|
-#define mark_treemap(M,i) ((M)->treemap |= idx2bit(i))
|
|
|
-#define clear_treemap(M,i) ((M)->treemap &= ~idx2bit(i))
|
|
|
-#define treemap_is_marked(M,i) ((M)->treemap & idx2bit(i))
|
|
|
-
|
|
|
-/* isolate the least set bit of a bitmap */
|
|
|
-#define least_bit(x) ((x) & -(x))
|
|
|
-
|
|
|
-/* mask with all bits to left of least bit of x on */
|
|
|
-#define left_bits(x) ((x<<1) | -(x<<1))
|
|
|
-
|
|
|
-/* mask with all bits to left of or equal to least bit of x on */
|
|
|
-#define same_or_left_bits(x) ((x) | -(x))
|
|
|
-
|
|
|
-/* index corresponding to given bit. Use x86 asm if possible */
|
|
|
-
|
|
|
-#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
|
|
|
-#define compute_bit2idx(X, I)\
|
|
|
-{\
|
|
|
- unsigned int J;\
|
|
|
- __asm__("bsfl\t%1, %0\n\t" : "=r" (J) : "g" (X));\
|
|
|
- I = (bindex_t)J;\
|
|
|
-}
|
|
|
-
|
|
|
-#elif defined (__INTEL_COMPILER)
|
|
|
-#define compute_bit2idx(X, I)\
|
|
|
-{\
|
|
|
- unsigned int J;\
|
|
|
- J = _bit_scan_forward (X); \
|
|
|
- I = (bindex_t)J;\
|
|
|
-}
|
|
|
-
|
|
|
-#elif defined(_MSC_VER) && _MSC_VER>=1300
|
|
|
-#define compute_bit2idx(X, I)\
|
|
|
-{\
|
|
|
- unsigned int J;\
|
|
|
- _BitScanForward((DWORD *) &J, X);\
|
|
|
- I = (bindex_t)J;\
|
|
|
-}
|
|
|
-
|
|
|
-#elif USE_BUILTIN_FFS
|
|
|
-#define compute_bit2idx(X, I) I = ffs(X)-1
|
|
|
-
|
|
|
-#else
|
|
|
-#define compute_bit2idx(X, I)\
|
|
|
-{\
|
|
|
- unsigned int Y = X - 1;\
|
|
|
- unsigned int K = Y >> (16-4) & 16;\
|
|
|
- unsigned int N = K; Y >>= K;\
|
|
|
- N += K = Y >> (8-3) & 8; Y >>= K;\
|
|
|
- N += K = Y >> (4-2) & 4; Y >>= K;\
|
|
|
- N += K = Y >> (2-1) & 2; Y >>= K;\
|
|
|
- N += K = Y >> (1-0) & 1; Y >>= K;\
|
|
|
- I = (bindex_t)(N + Y);\
|
|
|
-}
|
|
|
-#endif /* GNUC */
|
|
|
-
|
|
|
-
|
|
|
-/* ----------------------- Runtime Check Support ------------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- For security, the main invariant is that malloc/free/etc never
|
|
|
- writes to a static address other than malloc_state, unless static
|
|
|
- malloc_state itself has been corrupted, which cannot occur via
|
|
|
- malloc (because of these checks). In essence this means that we
|
|
|
- believe all pointers, sizes, maps etc held in malloc_state, but
|
|
|
- check all of those linked or offsetted from other embedded data
|
|
|
- structures. These checks are interspersed with main code in a way
|
|
|
- that tends to minimize their run-time cost.
|
|
|
-
|
|
|
- When FOOTERS is defined, in addition to range checking, we also
|
|
|
- verify footer fields of inuse chunks, which can be used guarantee
|
|
|
- that the mstate controlling malloc/free is intact. This is a
|
|
|
- streamlined version of the approach described by William Robertson
|
|
|
- et al in "Run-time Detection of Heap-based Overflows" LISA'03
|
|
|
- http://www.usenix.org/events/lisa03/tech/robertson.html The footer
|
|
|
- of an inuse chunk holds the xor of its mstate and a random seed,
|
|
|
- that is checked upon calls to free() and realloc(). This is
|
|
|
- (probablistically) unguessable from outside the program, but can be
|
|
|
- computed by any code successfully malloc'ing any chunk, so does not
|
|
|
- itself provide protection against code that has already broken
|
|
|
- security through some other means. Unlike Robertson et al, we
|
|
|
- always dynamically check addresses of all offset chunks (previous,
|
|
|
- next, etc). This turns out to be cheaper than relying on hashes.
|
|
|
-*/
|
|
|
-
|
|
|
-#if !INSECURE
|
|
|
-/* Check if address a is at least as high as any from MORECORE or MMAP */
|
|
|
-#define ok_address(M, a) ((char*)(a) >= (M)->least_addr)
|
|
|
-/* Check if address of next chunk n is higher than base chunk p */
|
|
|
-#define ok_next(p, n) ((char*)(p) < (char*)(n))
|
|
|
-/* Check if p has inuse status */
|
|
|
-#define ok_inuse(p) is_inuse(p)
|
|
|
-/* Check if p has its pinuse bit on */
|
|
|
-#define ok_pinuse(p) pinuse(p)
|
|
|
-
|
|
|
-#else /* !INSECURE */
|
|
|
-#define ok_address(M, a) (1)
|
|
|
-#define ok_next(b, n) (1)
|
|
|
-#define ok_inuse(p) (1)
|
|
|
-#define ok_pinuse(p) (1)
|
|
|
-#endif /* !INSECURE */
|
|
|
-
|
|
|
-#if (FOOTERS && !INSECURE)
|
|
|
-/* Check if (alleged) mstate m has expected magic field */
|
|
|
-#define ok_magic(M) ((M)->magic == mparams.magic)
|
|
|
-#else /* (FOOTERS && !INSECURE) */
|
|
|
-#define ok_magic(M) (1)
|
|
|
-#endif /* (FOOTERS && !INSECURE) */
|
|
|
-
|
|
|
-
|
|
|
-/* In gcc, use __builtin_expect to minimize impact of checks */
|
|
|
-#if !INSECURE
|
|
|
-#if defined(__GNUC__) && __GNUC__ >= 3
|
|
|
-#define RTCHECK(e) __builtin_expect(e, 1)
|
|
|
-#else /* GNUC */
|
|
|
-#define RTCHECK(e) (e)
|
|
|
-#endif /* GNUC */
|
|
|
-#else /* !INSECURE */
|
|
|
-#define RTCHECK(e) (1)
|
|
|
-#endif /* !INSECURE */
|
|
|
-
|
|
|
-/* macros to set up inuse chunks with or without footers */
|
|
|
-
|
|
|
-#if !FOOTERS
|
|
|
-
|
|
|
-#define mark_inuse_foot(M,p,s)
|
|
|
-
|
|
|
-/* Macros for setting head/foot of non-mmapped chunks */
|
|
|
-
|
|
|
-/* Set cinuse bit and pinuse bit of next chunk */
|
|
|
-#define set_inuse(M,p,s)\
|
|
|
- ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
|
|
|
- ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
|
|
|
-
|
|
|
-/* Set cinuse and pinuse of this chunk and pinuse of next chunk */
|
|
|
-#define set_inuse_and_pinuse(M,p,s)\
|
|
|
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
|
|
|
- ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
|
|
|
-
|
|
|
-/* Set size, cinuse and pinuse bit of this chunk */
|
|
|
-#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
|
|
|
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT))
|
|
|
-
|
|
|
-#else /* FOOTERS */
|
|
|
-
|
|
|
-/* Set foot of inuse chunk to be xor of mstate and seed */
|
|
|
-#define mark_inuse_foot(M,p,s)\
|
|
|
- (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic))
|
|
|
-
|
|
|
-#define get_mstate_for(p)\
|
|
|
- ((mstate)(((mchunkptr)((char*)(p) +\
|
|
|
- (chunksize(p))))->prev_foot ^ mparams.magic))
|
|
|
-
|
|
|
-#define set_inuse(M,p,s)\
|
|
|
- ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
|
|
|
- (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT), \
|
|
|
- mark_inuse_foot(M,p,s))
|
|
|
-
|
|
|
-#define set_inuse_and_pinuse(M,p,s)\
|
|
|
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
|
|
|
- (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT),\
|
|
|
- mark_inuse_foot(M,p,s))
|
|
|
-
|
|
|
-#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
|
|
|
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
|
|
|
- mark_inuse_foot(M, p, s))
|
|
|
-
|
|
|
-#endif /* !FOOTERS */
|
|
|
-
|
|
|
-/* ---------------------------- setting mparams -------------------------- */
|
|
|
-
|
|
|
-#ifdef ENABLE_LARGE_PAGES
|
|
|
-typedef size_t (WINAPI *GetLargePageMinimum_t)(void);
|
|
|
-#endif
|
|
|
-
|
|
|
-/* Initialize mparams */
|
|
|
-static int init_mparams(void) {
|
|
|
-#ifdef NEED_GLOBAL_LOCK_INIT
|
|
|
- if (malloc_global_mutex_status <= 0)
|
|
|
- init_malloc_global_mutex();
|
|
|
-#endif
|
|
|
-
|
|
|
- ACQUIRE_MALLOC_GLOBAL_LOCK();
|
|
|
- if (mparams.magic == 0) {
|
|
|
- size_t magic;
|
|
|
- size_t psize;
|
|
|
- size_t gsize;
|
|
|
-
|
|
|
-#ifndef WIN32
|
|
|
- psize = malloc_getpagesize;
|
|
|
- gsize = ((DEFAULT_GRANULARITY != 0)? DEFAULT_GRANULARITY : psize);
|
|
|
-#else /* WIN32 */
|
|
|
- {
|
|
|
- SYSTEM_INFO system_info;
|
|
|
- GetSystemInfo(&system_info);
|
|
|
- psize = system_info.dwPageSize;
|
|
|
- gsize = ((DEFAULT_GRANULARITY != 0)?
|
|
|
- DEFAULT_GRANULARITY : system_info.dwAllocationGranularity);
|
|
|
-#ifdef ENABLE_LARGE_PAGES
|
|
|
- {
|
|
|
- GetLargePageMinimum_t GetLargePageMinimum_ = (GetLargePageMinimum_t) GetProcAddress(GetModuleHandle(__T("kernel32.dll")), "GetLargePageMinimum");
|
|
|
- if(GetLargePageMinimum_) {
|
|
|
- size_t largepagesize = GetLargePageMinimum_();
|
|
|
- if(largepagesize) {
|
|
|
- psize = largepagesize;
|
|
|
- gsize = ((DEFAULT_GRANULARITY != 0)?
|
|
|
- DEFAULT_GRANULARITY : largepagesize);
|
|
|
- if(gsize < largepagesize) gsize = largepagesize;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-#endif
|
|
|
- }
|
|
|
-#endif /* WIN32 */
|
|
|
-
|
|
|
- /* Sanity-check configuration:
|
|
|
- size_t must be unsigned and as wide as pointer type.
|
|
|
- ints must be at least 4 bytes.
|
|
|
- alignment must be at least 8.
|
|
|
- Alignment, min chunk size, and page size must all be powers of 2.
|
|
|
- */
|
|
|
- if ((sizeof(size_t) != sizeof(char*)) ||
|
|
|
- (MAX_SIZE_T < MIN_CHUNK_SIZE) ||
|
|
|
- (sizeof(int) < 4) ||
|
|
|
- (MALLOC_ALIGNMENT < (size_t)8U) ||
|
|
|
- ((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-SIZE_T_ONE)) != 0) ||
|
|
|
- ((MCHUNK_SIZE & (MCHUNK_SIZE-SIZE_T_ONE)) != 0) ||
|
|
|
- ((gsize & (gsize-SIZE_T_ONE)) != 0) ||
|
|
|
- ((psize & (psize-SIZE_T_ONE)) != 0))
|
|
|
- ABORT;
|
|
|
-
|
|
|
- mparams.granularity = gsize;
|
|
|
- mparams.page_size = psize;
|
|
|
- mparams.mmap_threshold = DEFAULT_MMAP_THRESHOLD;
|
|
|
- mparams.trim_threshold = DEFAULT_TRIM_THRESHOLD;
|
|
|
-#if MORECORE_CONTIGUOUS
|
|
|
- mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT;
|
|
|
-#else /* MORECORE_CONTIGUOUS */
|
|
|
- mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT|USE_NONCONTIGUOUS_BIT;
|
|
|
-#endif /* MORECORE_CONTIGUOUS */
|
|
|
-
|
|
|
-#if !ONLY_MSPACES
|
|
|
- /* Set up lock for main malloc area */
|
|
|
- gm->mflags = mparams.default_mflags;
|
|
|
- INITIAL_LOCK(&gm->mutex);
|
|
|
-#endif
|
|
|
-
|
|
|
- {
|
|
|
-#if USE_DEV_RANDOM
|
|
|
- int fd;
|
|
|
- unsigned char buf[sizeof(size_t)];
|
|
|
- /* Try to use /dev/urandom, else fall back on using time */
|
|
|
- if ((fd = open("/dev/urandom", O_RDONLY)) >= 0 &&
|
|
|
- read(fd, buf, sizeof(buf)) == sizeof(buf)) {
|
|
|
- magic = *((size_t *) buf);
|
|
|
- close(fd);
|
|
|
- }
|
|
|
- else
|
|
|
-#endif /* USE_DEV_RANDOM */
|
|
|
-#ifdef WIN32
|
|
|
- magic = (size_t)(GetTickCount() ^ (size_t)0x55555555U);
|
|
|
-#else
|
|
|
- magic = (size_t)(time(0) ^ (size_t)0x55555555U);
|
|
|
-#endif
|
|
|
- magic |= (size_t)8U; /* ensure nonzero */
|
|
|
- magic &= ~(size_t)7U; /* improve chances of fault for bad values */
|
|
|
- mparams.magic = magic;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- RELEASE_MALLOC_GLOBAL_LOCK();
|
|
|
- return 1;
|
|
|
-}
|
|
|
-
|
|
|
-/* support for mallopt */
|
|
|
-static int change_mparam(int param_number, int value) {
|
|
|
- size_t val;
|
|
|
- ensure_initialization();
|
|
|
- val = (value == -1)? MAX_SIZE_T : (size_t)value;
|
|
|
- switch(param_number) {
|
|
|
- case M_TRIM_THRESHOLD:
|
|
|
- mparams.trim_threshold = val;
|
|
|
- return 1;
|
|
|
- case M_GRANULARITY:
|
|
|
- if (val >= mparams.page_size && ((val & (val-1)) == 0)) {
|
|
|
- mparams.granularity = val;
|
|
|
- return 1;
|
|
|
- }
|
|
|
- else
|
|
|
- return 0;
|
|
|
- case M_MMAP_THRESHOLD:
|
|
|
- mparams.mmap_threshold = val;
|
|
|
- return 1;
|
|
|
- default:
|
|
|
- return 0;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-#if DEBUG
|
|
|
-/* ------------------------- Debugging Support --------------------------- */
|
|
|
-
|
|
|
-/* Check properties of any chunk, whether free, inuse, mmapped etc */
|
|
|
-static void do_check_any_chunk(mstate m, mchunkptr p) {
|
|
|
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
|
|
|
- assert(ok_address(m, p));
|
|
|
-}
|
|
|
-
|
|
|
-/* Check properties of top chunk */
|
|
|
-static void do_check_top_chunk(mstate m, mchunkptr p) {
|
|
|
- msegmentptr sp = segment_holding(m, (char*)p);
|
|
|
- size_t sz = p->head & ~INUSE_BITS; /* third-lowest bit can be set! */
|
|
|
- assert(sp != 0);
|
|
|
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
|
|
|
- assert(ok_address(m, p));
|
|
|
- assert(sz == m->topsize);
|
|
|
- assert(sz > 0);
|
|
|
- assert(sz == ((sp->base + sp->size) - (char*)p) - TOP_FOOT_SIZE);
|
|
|
- assert(pinuse(p));
|
|
|
- assert(!pinuse(chunk_plus_offset(p, sz)));
|
|
|
-}
|
|
|
-
|
|
|
-/* Check properties of (inuse) mmapped chunks */
|
|
|
-static void do_check_mmapped_chunk(mstate m, mchunkptr p) {
|
|
|
- size_t sz = chunksize(p);
|
|
|
- size_t len = (sz + (p->prev_foot) + MMAP_FOOT_PAD);
|
|
|
- assert(is_mmapped(p));
|
|
|
- assert(use_mmap(m));
|
|
|
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
|
|
|
- assert(ok_address(m, p));
|
|
|
- assert(!is_small(sz));
|
|
|
- assert((len & (mparams.page_size-SIZE_T_ONE)) == 0);
|
|
|
- assert(chunk_plus_offset(p, sz)->head == FENCEPOST_HEAD);
|
|
|
- assert(chunk_plus_offset(p, sz+SIZE_T_SIZE)->head == 0);
|
|
|
-}
|
|
|
-
|
|
|
-/* Check properties of inuse chunks */
|
|
|
-static void do_check_inuse_chunk(mstate m, mchunkptr p) {
|
|
|
- do_check_any_chunk(m, p);
|
|
|
- assert(is_inuse(p));
|
|
|
- assert(next_pinuse(p));
|
|
|
- /* If not pinuse and not mmapped, previous chunk has OK offset */
|
|
|
- assert(is_mmapped(p) || pinuse(p) || next_chunk(prev_chunk(p)) == p);
|
|
|
- if (is_mmapped(p))
|
|
|
- do_check_mmapped_chunk(m, p);
|
|
|
-}
|
|
|
-
|
|
|
-/* Check properties of free chunks */
|
|
|
-static void do_check_free_chunk(mstate m, mchunkptr p) {
|
|
|
- size_t sz = chunksize(p);
|
|
|
- mchunkptr next = chunk_plus_offset(p, sz);
|
|
|
- do_check_any_chunk(m, p);
|
|
|
- assert(!is_inuse(p));
|
|
|
- assert(!next_pinuse(p));
|
|
|
- assert (!is_mmapped(p));
|
|
|
- if (p != m->dv && p != m->top) {
|
|
|
- if (sz >= MIN_CHUNK_SIZE) {
|
|
|
- assert((sz & CHUNK_ALIGN_MASK) == 0);
|
|
|
- assert(is_aligned(chunk2mem(p)));
|
|
|
- assert(next->prev_foot == sz);
|
|
|
- assert(pinuse(p));
|
|
|
- assert (next == m->top || is_inuse(next));
|
|
|
- assert(p->fd->bk == p);
|
|
|
- assert(p->bk->fd == p);
|
|
|
- }
|
|
|
- else /* markers are always of size SIZE_T_SIZE */
|
|
|
- assert(sz == SIZE_T_SIZE);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Check properties of malloced chunks at the point they are malloced */
|
|
|
-static void do_check_malloced_chunk(mstate m, void* mem, size_t s) {
|
|
|
- if (mem != 0) {
|
|
|
- mchunkptr p = mem2chunk(mem);
|
|
|
- size_t sz = p->head & ~INUSE_BITS;
|
|
|
- do_check_inuse_chunk(m, p);
|
|
|
- assert((sz & CHUNK_ALIGN_MASK) == 0);
|
|
|
- assert(sz >= MIN_CHUNK_SIZE);
|
|
|
- assert(sz >= s);
|
|
|
- /* unless mmapped, size is less than MIN_CHUNK_SIZE more than request */
|
|
|
- assert(is_mmapped(p) || sz < (s + MIN_CHUNK_SIZE));
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Check a tree and its subtrees. */
|
|
|
-static void do_check_tree(mstate m, tchunkptr t) {
|
|
|
- tchunkptr head = 0;
|
|
|
- tchunkptr u = t;
|
|
|
- bindex_t tindex = t->index;
|
|
|
- size_t tsize = chunksize(t);
|
|
|
- bindex_t idx;
|
|
|
- compute_tree_index(tsize, idx);
|
|
|
- assert(tindex == idx);
|
|
|
- assert(tsize >= MIN_LARGE_SIZE);
|
|
|
- assert(tsize >= minsize_for_tree_index(idx));
|
|
|
- assert((idx == NTREEBINS-1) || (tsize < minsize_for_tree_index((idx+1))));
|
|
|
-
|
|
|
- do { /* traverse through chain of same-sized nodes */
|
|
|
- do_check_any_chunk(m, ((mchunkptr)u));
|
|
|
- assert(u->index == tindex);
|
|
|
- assert(chunksize(u) == tsize);
|
|
|
- assert(!is_inuse(u));
|
|
|
- assert(!next_pinuse(u));
|
|
|
- assert(u->fd->bk == u);
|
|
|
- assert(u->bk->fd == u);
|
|
|
- if (u->parent == 0) {
|
|
|
- assert(u->child[0] == 0);
|
|
|
- assert(u->child[1] == 0);
|
|
|
- }
|
|
|
- else {
|
|
|
- assert(head == 0); /* only one node on chain has parent */
|
|
|
- head = u;
|
|
|
- assert(u->parent != u);
|
|
|
- assert (u->parent->child[0] == u ||
|
|
|
- u->parent->child[1] == u ||
|
|
|
- *((tbinptr*)(u->parent)) == u);
|
|
|
- if (u->child[0] != 0) {
|
|
|
- assert(u->child[0]->parent == u);
|
|
|
- assert(u->child[0] != u);
|
|
|
- do_check_tree(m, u->child[0]);
|
|
|
- }
|
|
|
- if (u->child[1] != 0) {
|
|
|
- assert(u->child[1]->parent == u);
|
|
|
- assert(u->child[1] != u);
|
|
|
- do_check_tree(m, u->child[1]);
|
|
|
- }
|
|
|
- if (u->child[0] != 0 && u->child[1] != 0) {
|
|
|
- assert(chunksize(u->child[0]) < chunksize(u->child[1]));
|
|
|
- }
|
|
|
- }
|
|
|
- u = u->fd;
|
|
|
- } while (u != t);
|
|
|
- assert(head != 0);
|
|
|
-}
|
|
|
-
|
|
|
-/* Check all the chunks in a treebin. */
|
|
|
-static void do_check_treebin(mstate m, bindex_t i) {
|
|
|
- tbinptr* tb = treebin_at(m, i);
|
|
|
- tchunkptr t = *tb;
|
|
|
- int empty = (m->treemap & (1U << i)) == 0;
|
|
|
- if (t == 0)
|
|
|
- assert(empty);
|
|
|
- if (!empty)
|
|
|
- do_check_tree(m, t);
|
|
|
-}
|
|
|
-
|
|
|
-/* Check all the chunks in a smallbin. */
|
|
|
-static void do_check_smallbin(mstate m, bindex_t i) {
|
|
|
- sbinptr b = smallbin_at(m, i);
|
|
|
- mchunkptr p = b->bk;
|
|
|
- unsigned int empty = (m->smallmap & (1U << i)) == 0;
|
|
|
- if (p == b)
|
|
|
- assert(empty);
|
|
|
- if (!empty) {
|
|
|
- for (; p != b; p = p->bk) {
|
|
|
- size_t size = chunksize(p);
|
|
|
- mchunkptr q;
|
|
|
- /* each chunk claims to be free */
|
|
|
- do_check_free_chunk(m, p);
|
|
|
- /* chunk belongs in bin */
|
|
|
- assert(small_index(size) == i);
|
|
|
- assert(p->bk == b || chunksize(p->bk) == chunksize(p));
|
|
|
- /* chunk is followed by an inuse chunk */
|
|
|
- q = next_chunk(p);
|
|
|
- if (q->head != FENCEPOST_HEAD)
|
|
|
- do_check_inuse_chunk(m, q);
|
|
|
- }
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Find x in a bin. Used in other check functions. */
|
|
|
-static int bin_find(mstate m, mchunkptr x) {
|
|
|
- size_t size = chunksize(x);
|
|
|
- if (is_small(size)) {
|
|
|
- bindex_t sidx = small_index(size);
|
|
|
- sbinptr b = smallbin_at(m, sidx);
|
|
|
- if (smallmap_is_marked(m, sidx)) {
|
|
|
- mchunkptr p = b;
|
|
|
- do {
|
|
|
- if (p == x)
|
|
|
- return 1;
|
|
|
- } while ((p = p->fd) != b);
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- bindex_t tidx;
|
|
|
- compute_tree_index(size, tidx);
|
|
|
- if (treemap_is_marked(m, tidx)) {
|
|
|
- tchunkptr t = *treebin_at(m, tidx);
|
|
|
- size_t sizebits = size << leftshift_for_tree_index(tidx);
|
|
|
- while (t != 0 && chunksize(t) != size) {
|
|
|
- t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
|
|
|
- sizebits <<= 1;
|
|
|
- }
|
|
|
- if (t != 0) {
|
|
|
- tchunkptr u = t;
|
|
|
- do {
|
|
|
- if (u == (tchunkptr)x)
|
|
|
- return 1;
|
|
|
- } while ((u = u->fd) != t);
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* Traverse each chunk and check it; return total */
|
|
|
-static size_t traverse_and_check(mstate m) {
|
|
|
- size_t sum = 0;
|
|
|
- if (is_initialized(m)) {
|
|
|
- msegmentptr s = &m->seg;
|
|
|
- sum += m->topsize + TOP_FOOT_SIZE;
|
|
|
- while (s != 0) {
|
|
|
- mchunkptr q = align_as_chunk(s->base);
|
|
|
- mchunkptr lastq = 0;
|
|
|
- assert(pinuse(q));
|
|
|
- while (segment_holds(s, q) &&
|
|
|
- q != m->top && q->head != FENCEPOST_HEAD) {
|
|
|
- sum += chunksize(q);
|
|
|
- if (is_inuse(q)) {
|
|
|
- assert(!bin_find(m, q));
|
|
|
- do_check_inuse_chunk(m, q);
|
|
|
- }
|
|
|
- else {
|
|
|
- assert(q == m->dv || bin_find(m, q));
|
|
|
- assert(lastq == 0 || is_inuse(lastq)); /* Not 2 consecutive free */
|
|
|
- do_check_free_chunk(m, q);
|
|
|
- }
|
|
|
- lastq = q;
|
|
|
- q = next_chunk(q);
|
|
|
- }
|
|
|
- s = s->next;
|
|
|
- }
|
|
|
- }
|
|
|
- return sum;
|
|
|
-}
|
|
|
-
|
|
|
-/* Check all properties of malloc_state. */
|
|
|
-static void do_check_malloc_state(mstate m) {
|
|
|
- bindex_t i;
|
|
|
- size_t total;
|
|
|
- /* check bins */
|
|
|
- for (i = 0; i < NSMALLBINS; ++i)
|
|
|
- do_check_smallbin(m, i);
|
|
|
- for (i = 0; i < NTREEBINS; ++i)
|
|
|
- do_check_treebin(m, i);
|
|
|
-
|
|
|
- if (m->dvsize != 0) { /* check dv chunk */
|
|
|
- do_check_any_chunk(m, m->dv);
|
|
|
- assert(m->dvsize == chunksize(m->dv));
|
|
|
- assert(m->dvsize >= MIN_CHUNK_SIZE);
|
|
|
- assert(bin_find(m, m->dv) == 0);
|
|
|
- }
|
|
|
-
|
|
|
- if (m->top != 0) { /* check top chunk */
|
|
|
- do_check_top_chunk(m, m->top);
|
|
|
- /*assert(m->topsize == chunksize(m->top)); redundant */
|
|
|
- assert(m->topsize > 0);
|
|
|
- assert(bin_find(m, m->top) == 0);
|
|
|
- }
|
|
|
-
|
|
|
- total = traverse_and_check(m);
|
|
|
- assert(total <= m->footprint);
|
|
|
- assert(m->footprint <= m->max_footprint);
|
|
|
-}
|
|
|
-#endif /* DEBUG */
|
|
|
-
|
|
|
-/* ----------------------------- statistics ------------------------------ */
|
|
|
-
|
|
|
-#if !NO_MALLINFO
|
|
|
-static struct mallinfo internal_mallinfo(mstate m) {
|
|
|
- struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
|
- ensure_initialization();
|
|
|
- if (!PREACTION(m)) {
|
|
|
- check_malloc_state(m);
|
|
|
- if (is_initialized(m)) {
|
|
|
- size_t nfree = SIZE_T_ONE; /* top always free */
|
|
|
- size_t mfree = m->topsize + TOP_FOOT_SIZE;
|
|
|
- size_t sum = mfree;
|
|
|
- msegmentptr s = &m->seg;
|
|
|
- while (s != 0) {
|
|
|
- mchunkptr q = align_as_chunk(s->base);
|
|
|
- while (segment_holds(s, q) &&
|
|
|
- q != m->top && q->head != FENCEPOST_HEAD) {
|
|
|
- size_t sz = chunksize(q);
|
|
|
- sum += sz;
|
|
|
- if (!is_inuse(q)) {
|
|
|
- mfree += sz;
|
|
|
- ++nfree;
|
|
|
- }
|
|
|
- q = next_chunk(q);
|
|
|
- }
|
|
|
- s = s->next;
|
|
|
- }
|
|
|
-
|
|
|
- nm.arena = sum;
|
|
|
- nm.ordblks = nfree;
|
|
|
- nm.hblkhd = m->footprint - sum;
|
|
|
- nm.usmblks = m->max_footprint;
|
|
|
- nm.uordblks = m->footprint - mfree;
|
|
|
- nm.fordblks = mfree;
|
|
|
- nm.keepcost = m->topsize;
|
|
|
- }
|
|
|
-
|
|
|
- POSTACTION(m);
|
|
|
- }
|
|
|
- return nm;
|
|
|
-}
|
|
|
-#endif /* !NO_MALLINFO */
|
|
|
-
|
|
|
-static void internal_malloc_stats(mstate m) {
|
|
|
- ensure_initialization();
|
|
|
- if (!PREACTION(m)) {
|
|
|
- size_t maxfp = 0;
|
|
|
- size_t fp = 0;
|
|
|
- size_t used = 0;
|
|
|
- check_malloc_state(m);
|
|
|
- if (is_initialized(m)) {
|
|
|
- msegmentptr s = &m->seg;
|
|
|
- maxfp = m->max_footprint;
|
|
|
- fp = m->footprint;
|
|
|
- used = fp - (m->topsize + TOP_FOOT_SIZE);
|
|
|
-
|
|
|
- while (s != 0) {
|
|
|
- mchunkptr q = align_as_chunk(s->base);
|
|
|
- while (segment_holds(s, q) &&
|
|
|
- q != m->top && q->head != FENCEPOST_HEAD) {
|
|
|
- if (!is_inuse(q))
|
|
|
- used -= chunksize(q);
|
|
|
- q = next_chunk(q);
|
|
|
- }
|
|
|
- s = s->next;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- fprintf(stderr, "max system bytes = %10lu\n", (unsigned long)(maxfp));
|
|
|
- fprintf(stderr, "system bytes = %10lu\n", (unsigned long)(fp));
|
|
|
- fprintf(stderr, "in use bytes = %10lu\n", (unsigned long)(used));
|
|
|
-
|
|
|
- POSTACTION(m);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* ----------------------- Operations on smallbins ----------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- Various forms of linking and unlinking are defined as macros. Even
|
|
|
- the ones for trees, which are very long but have very short typical
|
|
|
- paths. This is ugly but reduces reliance on inlining support of
|
|
|
- compilers.
|
|
|
-*/
|
|
|
-
|
|
|
-/* Link a free chunk into a smallbin */
|
|
|
-#define insert_small_chunk(M, P, S) {\
|
|
|
- bindex_t I = small_index(S);\
|
|
|
- mchunkptr B = smallbin_at(M, I);\
|
|
|
- mchunkptr F = B;\
|
|
|
- assert(S >= MIN_CHUNK_SIZE);\
|
|
|
- if (!smallmap_is_marked(M, I))\
|
|
|
- mark_smallmap(M, I);\
|
|
|
- else if (RTCHECK(ok_address(M, B->fd)))\
|
|
|
- F = B->fd;\
|
|
|
- else {\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- }\
|
|
|
- B->fd = P;\
|
|
|
- F->bk = P;\
|
|
|
- P->fd = F;\
|
|
|
- P->bk = B;\
|
|
|
-}
|
|
|
-
|
|
|
-/* Unlink a chunk from a smallbin */
|
|
|
-#define unlink_small_chunk(M, P, S) {\
|
|
|
- mchunkptr F = P->fd;\
|
|
|
- mchunkptr B = P->bk;\
|
|
|
- bindex_t I = small_index(S);\
|
|
|
- assert(P != B);\
|
|
|
- assert(P != F);\
|
|
|
- assert(chunksize(P) == small_index2size(I));\
|
|
|
- if (F == B)\
|
|
|
- clear_smallmap(M, I);\
|
|
|
- else if (RTCHECK((F == smallbin_at(M,I) || ok_address(M, F)) &&\
|
|
|
- (B == smallbin_at(M,I) || ok_address(M, B)))) {\
|
|
|
- F->bk = B;\
|
|
|
- B->fd = F;\
|
|
|
- }\
|
|
|
- else {\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- }\
|
|
|
-}
|
|
|
-
|
|
|
-/* Unlink the first chunk from a smallbin */
|
|
|
-#define unlink_first_small_chunk(M, B, P, I) {\
|
|
|
- mchunkptr F = P->fd;\
|
|
|
- assert(P != B);\
|
|
|
- assert(P != F);\
|
|
|
- assert(chunksize(P) == small_index2size(I));\
|
|
|
- if (B == F)\
|
|
|
- clear_smallmap(M, I);\
|
|
|
- else if (RTCHECK(ok_address(M, F))) {\
|
|
|
- B->fd = F;\
|
|
|
- F->bk = B;\
|
|
|
- }\
|
|
|
- else {\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- }\
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
-/* Replace dv node, binning the old one */
|
|
|
-/* Used only when dvsize known to be small */
|
|
|
-#define replace_dv(M, P, S) {\
|
|
|
- size_t DVS = M->dvsize;\
|
|
|
- if (DVS != 0) {\
|
|
|
- mchunkptr DV = M->dv;\
|
|
|
- assert(is_small(DVS));\
|
|
|
- insert_small_chunk(M, DV, DVS);\
|
|
|
- }\
|
|
|
- M->dvsize = S;\
|
|
|
- M->dv = P;\
|
|
|
-}
|
|
|
-
|
|
|
-/* ------------------------- Operations on trees ------------------------- */
|
|
|
-
|
|
|
-/* Insert chunk into tree */
|
|
|
-#define insert_large_chunk(M, X, S) {\
|
|
|
- tbinptr* H;\
|
|
|
- bindex_t I;\
|
|
|
- compute_tree_index(S, I);\
|
|
|
- H = treebin_at(M, I);\
|
|
|
- X->index = I;\
|
|
|
- X->child[0] = X->child[1] = 0;\
|
|
|
- if (!treemap_is_marked(M, I)) {\
|
|
|
- mark_treemap(M, I);\
|
|
|
- *H = X;\
|
|
|
- X->parent = (tchunkptr)H;\
|
|
|
- X->fd = X->bk = X;\
|
|
|
- }\
|
|
|
- else {\
|
|
|
- tchunkptr T = *H;\
|
|
|
- size_t K = S << leftshift_for_tree_index(I);\
|
|
|
- for (;;) {\
|
|
|
- if (chunksize(T) != S) {\
|
|
|
- tchunkptr* C = &(T->child[(K >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]);\
|
|
|
- K <<= 1;\
|
|
|
- if (*C != 0)\
|
|
|
- T = *C;\
|
|
|
- else if (RTCHECK(ok_address(M, C))) {\
|
|
|
- *C = X;\
|
|
|
- X->parent = T;\
|
|
|
- X->fd = X->bk = X;\
|
|
|
- break;\
|
|
|
- }\
|
|
|
- else {\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- break;\
|
|
|
- }\
|
|
|
- }\
|
|
|
- else {\
|
|
|
- tchunkptr F = T->fd;\
|
|
|
- if (RTCHECK(ok_address(M, T) && ok_address(M, F))) {\
|
|
|
- T->fd = F->bk = X;\
|
|
|
- X->fd = F;\
|
|
|
- X->bk = T;\
|
|
|
- X->parent = 0;\
|
|
|
- break;\
|
|
|
- }\
|
|
|
- else {\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- break;\
|
|
|
- }\
|
|
|
- }\
|
|
|
- }\
|
|
|
- }\
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- Unlink steps:
|
|
|
-
|
|
|
- 1. If x is a chained node, unlink it from its same-sized fd/bk links
|
|
|
- and choose its bk node as its replacement.
|
|
|
- 2. If x was the last node of its size, but not a leaf node, it must
|
|
|
- be replaced with a leaf node (not merely one with an open left or
|
|
|
- right), to make sure that lefts and rights of descendents
|
|
|
- correspond properly to bit masks. We use the rightmost descendent
|
|
|
- of x. We could use any other leaf, but this is easy to locate and
|
|
|
- tends to counteract removal of leftmosts elsewhere, and so keeps
|
|
|
- paths shorter than minimally guaranteed. This doesn't loop much
|
|
|
- because on average a node in a tree is near the bottom.
|
|
|
- 3. If x is the base of a chain (i.e., has parent links) relink
|
|
|
- x's parent and children to x's replacement (or null if none).
|
|
|
-*/
|
|
|
-
|
|
|
-#define unlink_large_chunk(M, X) {\
|
|
|
- tchunkptr XP = X->parent;\
|
|
|
- tchunkptr R;\
|
|
|
- if (X->bk != X) {\
|
|
|
- tchunkptr F = X->fd;\
|
|
|
- R = X->bk;\
|
|
|
- if (RTCHECK(ok_address(M, F))) {\
|
|
|
- F->bk = R;\
|
|
|
- R->fd = F;\
|
|
|
- }\
|
|
|
- else {\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- }\
|
|
|
- }\
|
|
|
- else {\
|
|
|
- tchunkptr* RP;\
|
|
|
- if (((R = *(RP = &(X->child[1]))) != 0) ||\
|
|
|
- ((R = *(RP = &(X->child[0]))) != 0)) {\
|
|
|
- tchunkptr* CP;\
|
|
|
- while ((*(CP = &(R->child[1])) != 0) ||\
|
|
|
- (*(CP = &(R->child[0])) != 0)) {\
|
|
|
- R = *(RP = CP);\
|
|
|
- }\
|
|
|
- if (RTCHECK(ok_address(M, RP)))\
|
|
|
- *RP = 0;\
|
|
|
- else {\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- }\
|
|
|
- }\
|
|
|
- }\
|
|
|
- if (XP != 0) {\
|
|
|
- tbinptr* H = treebin_at(M, X->index);\
|
|
|
- if (X == *H) {\
|
|
|
- if ((*H = R) == 0) \
|
|
|
- clear_treemap(M, X->index);\
|
|
|
- }\
|
|
|
- else if (RTCHECK(ok_address(M, XP))) {\
|
|
|
- if (XP->child[0] == X) \
|
|
|
- XP->child[0] = R;\
|
|
|
- else \
|
|
|
- XP->child[1] = R;\
|
|
|
- }\
|
|
|
- else\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- if (R != 0) {\
|
|
|
- if (RTCHECK(ok_address(M, R))) {\
|
|
|
- tchunkptr C0, C1;\
|
|
|
- R->parent = XP;\
|
|
|
- if ((C0 = X->child[0]) != 0) {\
|
|
|
- if (RTCHECK(ok_address(M, C0))) {\
|
|
|
- R->child[0] = C0;\
|
|
|
- C0->parent = R;\
|
|
|
- }\
|
|
|
- else\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- }\
|
|
|
- if ((C1 = X->child[1]) != 0) {\
|
|
|
- if (RTCHECK(ok_address(M, C1))) {\
|
|
|
- R->child[1] = C1;\
|
|
|
- C1->parent = R;\
|
|
|
- }\
|
|
|
- else\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- }\
|
|
|
- }\
|
|
|
- else\
|
|
|
- CORRUPTION_ERROR_ACTION(M);\
|
|
|
- }\
|
|
|
- }\
|
|
|
-}
|
|
|
-
|
|
|
-/* Relays to large vs small bin operations */
|
|
|
-
|
|
|
-#define insert_chunk(M, P, S)\
|
|
|
- if (is_small(S)) insert_small_chunk(M, P, S)\
|
|
|
- else { tchunkptr TP = (tchunkptr)(P); insert_large_chunk(M, TP, S); }
|
|
|
-
|
|
|
-#define unlink_chunk(M, P, S)\
|
|
|
- if (is_small(S)) unlink_small_chunk(M, P, S)\
|
|
|
- else { tchunkptr TP = (tchunkptr)(P); unlink_large_chunk(M, TP); }
|
|
|
-
|
|
|
-
|
|
|
-/* Relays to internal calls to malloc/free from realloc, memalign etc */
|
|
|
-
|
|
|
-#if ONLY_MSPACES
|
|
|
-#define internal_malloc(m, b) mspace_malloc(m, b)
|
|
|
-#define internal_free(m, mem) mspace_free(m,mem);
|
|
|
-#else /* ONLY_MSPACES */
|
|
|
-#if MSPACES
|
|
|
-#define internal_malloc(m, b)\
|
|
|
- (m == gm)? dlmalloc(b) : mspace_malloc(m, b)
|
|
|
-#define internal_free(m, mem)\
|
|
|
- if (m == gm) dlfree(mem); else mspace_free(m,mem);
|
|
|
-#else /* MSPACES */
|
|
|
-#define internal_malloc(m, b) dlmalloc(b)
|
|
|
-#define internal_free(m, mem) dlfree(mem)
|
|
|
-#endif /* MSPACES */
|
|
|
-#endif /* ONLY_MSPACES */
|
|
|
-
|
|
|
-/* ----------------------- Direct-mmapping chunks ----------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- Directly mmapped chunks are set up with an offset to the start of
|
|
|
- the mmapped region stored in the prev_foot field of the chunk. This
|
|
|
- allows reconstruction of the required argument to MUNMAP when freed,
|
|
|
- and also allows adjustment of the returned chunk to meet alignment
|
|
|
- requirements (especially in memalign).
|
|
|
-*/
|
|
|
-
|
|
|
-/* Malloc using mmap */
|
|
|
-static void* mmap_alloc(mstate m, size_t nb) {
|
|
|
- size_t mmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
|
|
|
- if (mmsize > nb) { /* Check for wrap around 0 */
|
|
|
- char* mm = (char*)(CALL_DIRECT_MMAP(mmsize));
|
|
|
- if (mm != CMFAIL) {
|
|
|
- size_t offset = align_offset(chunk2mem(mm));
|
|
|
- size_t psize = mmsize - offset - MMAP_FOOT_PAD;
|
|
|
- mchunkptr p = (mchunkptr)(mm + offset);
|
|
|
- p->prev_foot = offset;
|
|
|
- p->head = psize;
|
|
|
- mark_inuse_foot(m, p, psize);
|
|
|
- chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD;
|
|
|
- chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0;
|
|
|
-
|
|
|
- if (m->least_addr == 0 || mm < m->least_addr)
|
|
|
- m->least_addr = mm;
|
|
|
- if ((m->footprint += mmsize) > m->max_footprint)
|
|
|
- m->max_footprint = m->footprint;
|
|
|
- assert(is_aligned(chunk2mem(p)));
|
|
|
- check_mmapped_chunk(m, p);
|
|
|
- return chunk2mem(p);
|
|
|
- }
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* Realloc using mmap */
|
|
|
-static mchunkptr mmap_resize(mstate m, mchunkptr oldp, size_t nb) {
|
|
|
- size_t oldsize = chunksize(oldp);
|
|
|
- if (is_small(nb)) /* Can't shrink mmap regions below small size */
|
|
|
- return 0;
|
|
|
- /* Keep old chunk if big enough but not too big */
|
|
|
- if (oldsize >= nb + SIZE_T_SIZE &&
|
|
|
- (oldsize - nb) <= (mparams.granularity << 1))
|
|
|
- return oldp;
|
|
|
- else {
|
|
|
- size_t offset = oldp->prev_foot;
|
|
|
- size_t oldmmsize = oldsize + offset + MMAP_FOOT_PAD;
|
|
|
- size_t newmmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
|
|
|
- char* cp = (char*)CALL_MREMAP((char*)oldp - offset,
|
|
|
- oldmmsize, newmmsize, 1);
|
|
|
- if (cp != CMFAIL) {
|
|
|
- mchunkptr newp = (mchunkptr)(cp + offset);
|
|
|
- size_t psize = newmmsize - offset - MMAP_FOOT_PAD;
|
|
|
- newp->head = psize;
|
|
|
- mark_inuse_foot(m, newp, psize);
|
|
|
- chunk_plus_offset(newp, psize)->head = FENCEPOST_HEAD;
|
|
|
- chunk_plus_offset(newp, psize+SIZE_T_SIZE)->head = 0;
|
|
|
-
|
|
|
- if (cp < m->least_addr)
|
|
|
- m->least_addr = cp;
|
|
|
- if ((m->footprint += newmmsize - oldmmsize) > m->max_footprint)
|
|
|
- m->max_footprint = m->footprint;
|
|
|
- check_mmapped_chunk(m, newp);
|
|
|
- return newp;
|
|
|
- }
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* -------------------------- mspace management -------------------------- */
|
|
|
-
|
|
|
-/* Initialize top chunk and its size */
|
|
|
-static void init_top(mstate m, mchunkptr p, size_t psize) {
|
|
|
- /* Ensure alignment */
|
|
|
- size_t offset = align_offset(chunk2mem(p));
|
|
|
- p = (mchunkptr)((char*)p + offset);
|
|
|
- psize -= offset;
|
|
|
-
|
|
|
- m->top = p;
|
|
|
- m->topsize = psize;
|
|
|
- p->head = psize | PINUSE_BIT;
|
|
|
- /* set size of fake trailing chunk holding overhead space only once */
|
|
|
- chunk_plus_offset(p, psize)->head = TOP_FOOT_SIZE;
|
|
|
- m->trim_check = mparams.trim_threshold; /* reset on each update */
|
|
|
-}
|
|
|
-
|
|
|
-/* Initialize bins for a new mstate that is otherwise zeroed out */
|
|
|
-static void init_bins(mstate m) {
|
|
|
- /* Establish circular links for smallbins */
|
|
|
- bindex_t i;
|
|
|
- for (i = 0; i < NSMALLBINS; ++i) {
|
|
|
- sbinptr bin = smallbin_at(m,i);
|
|
|
- bin->fd = bin->bk = bin;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-#if PROCEED_ON_ERROR
|
|
|
-
|
|
|
-/* default corruption action */
|
|
|
-static void reset_on_error(mstate m) {
|
|
|
- int i;
|
|
|
- ++malloc_corruption_error_count;
|
|
|
- /* Reinitialize fields to forget about all memory */
|
|
|
- m->smallbins = m->treebins = 0;
|
|
|
- m->dvsize = m->topsize = 0;
|
|
|
- m->seg.base = 0;
|
|
|
- m->seg.size = 0;
|
|
|
- m->seg.next = 0;
|
|
|
- m->top = m->dv = 0;
|
|
|
- for (i = 0; i < NTREEBINS; ++i)
|
|
|
- *treebin_at(m, i) = 0;
|
|
|
- init_bins(m);
|
|
|
-}
|
|
|
-#endif /* PROCEED_ON_ERROR */
|
|
|
-
|
|
|
-/* Allocate chunk and prepend remainder with chunk in successor base. */
|
|
|
-static void* prepend_alloc(mstate m, char* newbase, char* oldbase,
|
|
|
- size_t nb) {
|
|
|
- mchunkptr p = align_as_chunk(newbase);
|
|
|
- mchunkptr oldfirst = align_as_chunk(oldbase);
|
|
|
- size_t psize = (char*)oldfirst - (char*)p;
|
|
|
- mchunkptr q = chunk_plus_offset(p, nb);
|
|
|
- size_t qsize = psize - nb;
|
|
|
- set_size_and_pinuse_of_inuse_chunk(m, p, nb);
|
|
|
-
|
|
|
- assert((char*)oldfirst > (char*)q);
|
|
|
- assert(pinuse(oldfirst));
|
|
|
- assert(qsize >= MIN_CHUNK_SIZE);
|
|
|
-
|
|
|
- /* consolidate remainder with first chunk of old base */
|
|
|
- if (oldfirst == m->top) {
|
|
|
- size_t tsize = m->topsize += qsize;
|
|
|
- m->top = q;
|
|
|
- q->head = tsize | PINUSE_BIT;
|
|
|
- check_top_chunk(m, q);
|
|
|
- }
|
|
|
- else if (oldfirst == m->dv) {
|
|
|
- size_t dsize = m->dvsize += qsize;
|
|
|
- m->dv = q;
|
|
|
- set_size_and_pinuse_of_free_chunk(q, dsize);
|
|
|
- }
|
|
|
- else {
|
|
|
- if (!is_inuse(oldfirst)) {
|
|
|
- size_t nsize = chunksize(oldfirst);
|
|
|
- unlink_chunk(m, oldfirst, nsize);
|
|
|
- oldfirst = chunk_plus_offset(oldfirst, nsize);
|
|
|
- qsize += nsize;
|
|
|
- }
|
|
|
- set_free_with_pinuse(q, qsize, oldfirst);
|
|
|
- insert_chunk(m, q, qsize);
|
|
|
- check_free_chunk(m, q);
|
|
|
- }
|
|
|
-
|
|
|
- check_malloced_chunk(m, chunk2mem(p), nb);
|
|
|
- return chunk2mem(p);
|
|
|
-}
|
|
|
-
|
|
|
-/* Add a segment to hold a new noncontiguous region */
|
|
|
-static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) {
|
|
|
- /* Determine locations and sizes of segment, fenceposts, old top */
|
|
|
- char* old_top = (char*)m->top;
|
|
|
- msegmentptr oldsp = segment_holding(m, old_top);
|
|
|
- char* old_end = oldsp->base + oldsp->size;
|
|
|
- size_t ssize = pad_request(sizeof(struct malloc_segment));
|
|
|
- char* rawsp = old_end - (ssize + FOUR_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
|
|
|
- size_t offset = align_offset(chunk2mem(rawsp));
|
|
|
- char* asp = rawsp + offset;
|
|
|
- char* csp = (asp < (old_top + MIN_CHUNK_SIZE))? old_top : asp;
|
|
|
- mchunkptr sp = (mchunkptr)csp;
|
|
|
- msegmentptr ss = (msegmentptr)(chunk2mem(sp));
|
|
|
- mchunkptr tnext = chunk_plus_offset(sp, ssize);
|
|
|
- mchunkptr p = tnext;
|
|
|
- int nfences = 0;
|
|
|
-
|
|
|
- /* reset top to new space */
|
|
|
- init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
|
|
|
-
|
|
|
- /* Set up segment record */
|
|
|
- assert(is_aligned(ss));
|
|
|
- set_size_and_pinuse_of_inuse_chunk(m, sp, ssize);
|
|
|
- *ss = m->seg; /* Push current record */
|
|
|
- m->seg.base = tbase;
|
|
|
- m->seg.size = tsize;
|
|
|
- m->seg.sflags = mmapped;
|
|
|
- m->seg.next = ss;
|
|
|
-
|
|
|
- /* Insert trailing fenceposts */
|
|
|
- for (;;) {
|
|
|
- mchunkptr nextp = chunk_plus_offset(p, SIZE_T_SIZE);
|
|
|
- p->head = FENCEPOST_HEAD;
|
|
|
- ++nfences;
|
|
|
- if ((char*)(&(nextp->head)) < old_end)
|
|
|
- p = nextp;
|
|
|
- else
|
|
|
- break;
|
|
|
- }
|
|
|
- assert(nfences >= 2);
|
|
|
-
|
|
|
- /* Insert the rest of old top into a bin as an ordinary free chunk */
|
|
|
- if (csp != old_top) {
|
|
|
- mchunkptr q = (mchunkptr)old_top;
|
|
|
- size_t psize = csp - old_top;
|
|
|
- mchunkptr tn = chunk_plus_offset(q, psize);
|
|
|
- set_free_with_pinuse(q, psize, tn);
|
|
|
- insert_chunk(m, q, psize);
|
|
|
- }
|
|
|
-
|
|
|
- check_top_chunk(m, m->top);
|
|
|
-}
|
|
|
-
|
|
|
-/* -------------------------- System allocation -------------------------- */
|
|
|
-
|
|
|
-/* Get memory from system using MORECORE or MMAP */
|
|
|
-static void* sys_alloc(mstate m, size_t nb) {
|
|
|
- char* tbase = CMFAIL;
|
|
|
- size_t tsize = 0;
|
|
|
- flag_t mmap_flag = 0;
|
|
|
-
|
|
|
- ensure_initialization();
|
|
|
-
|
|
|
- /* Directly map large chunks, but only if already initialized */
|
|
|
- if (use_mmap(m) && nb >= mparams.mmap_threshold && m->topsize != 0) {
|
|
|
- void* mem = mmap_alloc(m, nb);
|
|
|
- if (mem != 0)
|
|
|
- return mem;
|
|
|
- }
|
|
|
-
|
|
|
- /*
|
|
|
- Try getting memory in any of three ways (in most-preferred to
|
|
|
- least-preferred order):
|
|
|
- 1. A call to MORECORE that can normally contiguously extend memory.
|
|
|
- (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or
|
|
|
- or main space is mmapped or a previous contiguous call failed)
|
|
|
- 2. A call to MMAP new space (disabled if not HAVE_MMAP).
|
|
|
- Note that under the default settings, if MORECORE is unable to
|
|
|
- fulfill a request, and HAVE_MMAP is true, then mmap is
|
|
|
- used as a noncontiguous system allocator. This is a useful backup
|
|
|
- strategy for systems with holes in address spaces -- in this case
|
|
|
- sbrk cannot contiguously expand the heap, but mmap may be able to
|
|
|
- find space.
|
|
|
- 3. A call to MORECORE that cannot usually contiguously extend memory.
|
|
|
- (disabled if not HAVE_MORECORE)
|
|
|
-
|
|
|
- In all cases, we need to request enough bytes from system to ensure
|
|
|
- we can malloc nb bytes upon success, so pad with enough space for
|
|
|
- top_foot, plus alignment-pad to make sure we don't lose bytes if
|
|
|
- not on boundary, and round this up to a granularity unit.
|
|
|
- */
|
|
|
-
|
|
|
- if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) {
|
|
|
- char* br = CMFAIL;
|
|
|
- msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top);
|
|
|
- size_t asize = 0;
|
|
|
- ACQUIRE_MALLOC_GLOBAL_LOCK();
|
|
|
-
|
|
|
- if (ss == 0) { /* First time through or recovery */
|
|
|
- char* base = (char*)CALL_MORECORE(0);
|
|
|
- if (base != CMFAIL) {
|
|
|
- asize = granularity_align(nb + SYS_ALLOC_PADDING);
|
|
|
- /* Adjust to end on a page boundary */
|
|
|
- if (!is_page_aligned(base))
|
|
|
- asize += (page_align((size_t)base) - (size_t)base);
|
|
|
- /* Can't call MORECORE if size is negative when treated as signed */
|
|
|
- if (asize < HALF_MAX_SIZE_T &&
|
|
|
- (br = (char*)(CALL_MORECORE(asize))) == base) {
|
|
|
- tbase = base;
|
|
|
- tsize = asize;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- /* Subtract out existing available top space from MORECORE request. */
|
|
|
- asize = granularity_align(nb - m->topsize + SYS_ALLOC_PADDING);
|
|
|
- /* Use mem here only if it did continuously extend old space */
|
|
|
- if (asize < HALF_MAX_SIZE_T &&
|
|
|
- (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) {
|
|
|
- tbase = br;
|
|
|
- tsize = asize;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (tbase == CMFAIL) { /* Cope with partial failure */
|
|
|
- if (br != CMFAIL) { /* Try to use/extend the space we did get */
|
|
|
- if (asize < HALF_MAX_SIZE_T &&
|
|
|
- asize < nb + SYS_ALLOC_PADDING) {
|
|
|
- size_t esize = granularity_align(nb + SYS_ALLOC_PADDING - asize);
|
|
|
- if (esize < HALF_MAX_SIZE_T) {
|
|
|
- char* end = (char*)CALL_MORECORE(esize);
|
|
|
- if (end != CMFAIL)
|
|
|
- asize += esize;
|
|
|
- else { /* Can't use; try to release */
|
|
|
- (void) CALL_MORECORE(-asize);
|
|
|
- br = CMFAIL;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- if (br != CMFAIL) { /* Use the space we did get */
|
|
|
- tbase = br;
|
|
|
- tsize = asize;
|
|
|
- }
|
|
|
- else
|
|
|
- disable_contiguous(m); /* Don't try contiguous path in the future */
|
|
|
- }
|
|
|
-
|
|
|
- RELEASE_MALLOC_GLOBAL_LOCK();
|
|
|
- }
|
|
|
-
|
|
|
- if (HAVE_MMAP && tbase == CMFAIL) { /* Try MMAP */
|
|
|
- size_t rsize = granularity_align(nb + SYS_ALLOC_PADDING);
|
|
|
- if (rsize > nb) { /* Fail if wraps around zero */
|
|
|
- char* mp = (char*)(CALL_MMAP(rsize));
|
|
|
- if (mp != CMFAIL) {
|
|
|
- tbase = mp;
|
|
|
- tsize = rsize;
|
|
|
- mmap_flag = USE_MMAP_BIT;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */
|
|
|
- size_t asize = granularity_align(nb + SYS_ALLOC_PADDING);
|
|
|
- if (asize < HALF_MAX_SIZE_T) {
|
|
|
- char* br = CMFAIL;
|
|
|
- char* end = CMFAIL;
|
|
|
- ACQUIRE_MALLOC_GLOBAL_LOCK();
|
|
|
- br = (char*)(CALL_MORECORE(asize));
|
|
|
- end = (char*)(CALL_MORECORE(0));
|
|
|
- RELEASE_MALLOC_GLOBAL_LOCK();
|
|
|
- if (br != CMFAIL && end != CMFAIL && br < end) {
|
|
|
- size_t ssize = end - br;
|
|
|
- if (ssize > nb + TOP_FOOT_SIZE) {
|
|
|
- tbase = br;
|
|
|
- tsize = ssize;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (tbase != CMFAIL) {
|
|
|
-
|
|
|
- if ((m->footprint += tsize) > m->max_footprint)
|
|
|
- m->max_footprint = m->footprint;
|
|
|
-
|
|
|
- if (!is_initialized(m)) { /* first-time initialization */
|
|
|
- if (m->least_addr == 0 || tbase < m->least_addr)
|
|
|
- m->least_addr = tbase;
|
|
|
- m->seg.base = tbase;
|
|
|
- m->seg.size = tsize;
|
|
|
- m->seg.sflags = mmap_flag;
|
|
|
- m->magic = mparams.magic;
|
|
|
- m->release_checks = MAX_RELEASE_CHECK_RATE;
|
|
|
- init_bins(m);
|
|
|
-#if !ONLY_MSPACES
|
|
|
- if (is_global(m))
|
|
|
- init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
|
|
|
- else
|
|
|
-#endif
|
|
|
- {
|
|
|
- /* Offset top by embedded malloc_state */
|
|
|
- mchunkptr mn = next_chunk(mem2chunk(m));
|
|
|
- init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- else {
|
|
|
- /* Try to merge with an existing segment */
|
|
|
- msegmentptr sp = &m->seg;
|
|
|
- /* Only consider most recent segment if traversal suppressed */
|
|
|
- while (sp != 0 && tbase != sp->base + sp->size)
|
|
|
- sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
|
|
|
- if (sp != 0 &&
|
|
|
- !is_extern_segment(sp) &&
|
|
|
- (sp->sflags & USE_MMAP_BIT) == mmap_flag &&
|
|
|
- segment_holds(sp, m->top)) { /* append */
|
|
|
- sp->size += tsize;
|
|
|
- init_top(m, m->top, m->topsize + tsize);
|
|
|
- }
|
|
|
- else {
|
|
|
- if (tbase < m->least_addr)
|
|
|
- m->least_addr = tbase;
|
|
|
- sp = &m->seg;
|
|
|
- while (sp != 0 && sp->base != tbase + tsize)
|
|
|
- sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
|
|
|
- if (sp != 0 &&
|
|
|
- !is_extern_segment(sp) &&
|
|
|
- (sp->sflags & USE_MMAP_BIT) == mmap_flag) {
|
|
|
- char* oldbase = sp->base;
|
|
|
- sp->base = tbase;
|
|
|
- sp->size += tsize;
|
|
|
- return prepend_alloc(m, tbase, oldbase, nb);
|
|
|
- }
|
|
|
- else
|
|
|
- add_segment(m, tbase, tsize, mmap_flag);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (nb < m->topsize) { /* Allocate from new or extended top space */
|
|
|
- size_t rsize = m->topsize -= nb;
|
|
|
- mchunkptr p = m->top;
|
|
|
- mchunkptr r = m->top = chunk_plus_offset(p, nb);
|
|
|
- r->head = rsize | PINUSE_BIT;
|
|
|
- set_size_and_pinuse_of_inuse_chunk(m, p, nb);
|
|
|
- check_top_chunk(m, m->top);
|
|
|
- check_malloced_chunk(m, chunk2mem(p), nb);
|
|
|
- return chunk2mem(p);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- MALLOC_FAILURE_ACTION;
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* ----------------------- system deallocation -------------------------- */
|
|
|
-
|
|
|
-/* Unmap and unlink any mmapped segments that don't contain used chunks */
|
|
|
-static size_t release_unused_segments(mstate m) {
|
|
|
- size_t released = 0;
|
|
|
- int nsegs = 0;
|
|
|
- msegmentptr pred = &m->seg;
|
|
|
- msegmentptr sp = pred->next;
|
|
|
- while (sp != 0) {
|
|
|
- char* base = sp->base;
|
|
|
- size_t size = sp->size;
|
|
|
- msegmentptr next = sp->next;
|
|
|
- ++nsegs;
|
|
|
- if (is_mmapped_segment(sp) && !is_extern_segment(sp)) {
|
|
|
- mchunkptr p = align_as_chunk(base);
|
|
|
- size_t psize = chunksize(p);
|
|
|
- /* Can unmap if first chunk holds entire segment and not pinned */
|
|
|
- if (!is_inuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) {
|
|
|
- tchunkptr tp = (tchunkptr)p;
|
|
|
- assert(segment_holds(sp, (char*)sp));
|
|
|
- if (p == m->dv) {
|
|
|
- m->dv = 0;
|
|
|
- m->dvsize = 0;
|
|
|
- }
|
|
|
- else {
|
|
|
- unlink_large_chunk(m, tp);
|
|
|
- }
|
|
|
- if (CALL_MUNMAP(base, size) == 0) {
|
|
|
- released += size;
|
|
|
- m->footprint -= size;
|
|
|
- /* unlink obsoleted record */
|
|
|
- sp = pred;
|
|
|
- sp->next = next;
|
|
|
- }
|
|
|
- else { /* back out if cannot unmap */
|
|
|
- insert_large_chunk(m, tp, psize);
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- if (NO_SEGMENT_TRAVERSAL) /* scan only first segment */
|
|
|
- break;
|
|
|
- pred = sp;
|
|
|
- sp = next;
|
|
|
- }
|
|
|
- /* Reset check counter */
|
|
|
- m->release_checks = ((nsegs > MAX_RELEASE_CHECK_RATE)?
|
|
|
- nsegs : MAX_RELEASE_CHECK_RATE);
|
|
|
- return released;
|
|
|
-}
|
|
|
-
|
|
|
-static int sys_trim(mstate m, size_t pad) {
|
|
|
- size_t released = 0;
|
|
|
- ensure_initialization();
|
|
|
- if (pad < MAX_REQUEST && is_initialized(m)) {
|
|
|
- pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */
|
|
|
-
|
|
|
- if (m->topsize > pad) {
|
|
|
- /* Shrink top space in granularity-size units, keeping at least one */
|
|
|
- size_t unit = mparams.granularity;
|
|
|
- size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit -
|
|
|
- SIZE_T_ONE) * unit;
|
|
|
- msegmentptr sp = segment_holding(m, (char*)m->top);
|
|
|
-
|
|
|
- if (!is_extern_segment(sp)) {
|
|
|
- if (is_mmapped_segment(sp)) {
|
|
|
- if (HAVE_MMAP &&
|
|
|
- sp->size >= extra &&
|
|
|
- !has_segment_link(m, sp)) { /* can't shrink if pinned */
|
|
|
- size_t newsize = sp->size - extra;
|
|
|
- /* Prefer mremap, fall back to munmap */
|
|
|
- if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) ||
|
|
|
- (CALL_MUNMAP(sp->base + newsize, extra) == 0)) {
|
|
|
- released = extra;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- else if (HAVE_MORECORE) {
|
|
|
- if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */
|
|
|
- extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit;
|
|
|
- ACQUIRE_MALLOC_GLOBAL_LOCK();
|
|
|
- {
|
|
|
- /* Make sure end of memory is where we last set it. */
|
|
|
- char* old_br = (char*)(CALL_MORECORE(0));
|
|
|
- if (old_br == sp->base + sp->size) {
|
|
|
- char* rel_br = (char*)(CALL_MORECORE(-extra));
|
|
|
- char* new_br = (char*)(CALL_MORECORE(0));
|
|
|
- if (rel_br != CMFAIL && new_br < old_br)
|
|
|
- released = old_br - new_br;
|
|
|
- }
|
|
|
- }
|
|
|
- RELEASE_MALLOC_GLOBAL_LOCK();
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (released != 0) {
|
|
|
- sp->size -= released;
|
|
|
- m->footprint -= released;
|
|
|
- init_top(m, m->top, m->topsize - released);
|
|
|
- check_top_chunk(m, m->top);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Unmap any unused mmapped segments */
|
|
|
- if (HAVE_MMAP)
|
|
|
- released += release_unused_segments(m);
|
|
|
-
|
|
|
- /* On failure, disable autotrim to avoid repeated failed future calls */
|
|
|
- if (released == 0 && m->topsize > m->trim_check)
|
|
|
- m->trim_check = MAX_SIZE_T;
|
|
|
- }
|
|
|
-
|
|
|
- return (released != 0)? 1 : 0;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/* ---------------------------- malloc support --------------------------- */
|
|
|
-
|
|
|
-/* allocate a large request from the best fitting chunk in a treebin */
|
|
|
-static void* tmalloc_large(mstate m, size_t nb) {
|
|
|
- tchunkptr v = 0;
|
|
|
- size_t rsize = -nb; /* Unsigned negation */
|
|
|
- tchunkptr t;
|
|
|
- bindex_t idx;
|
|
|
- compute_tree_index(nb, idx);
|
|
|
- if ((t = *treebin_at(m, idx)) != 0) {
|
|
|
- /* Traverse tree for this bin looking for node with size == nb */
|
|
|
- size_t sizebits = nb << leftshift_for_tree_index(idx);
|
|
|
- tchunkptr rst = 0; /* The deepest untaken right subtree */
|
|
|
- for (;;) {
|
|
|
- tchunkptr rt;
|
|
|
- size_t trem = chunksize(t) - nb;
|
|
|
- if (trem < rsize) {
|
|
|
- v = t;
|
|
|
- if ((rsize = trem) == 0)
|
|
|
- break;
|
|
|
- }
|
|
|
- rt = t->child[1];
|
|
|
- t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
|
|
|
- if (rt != 0 && rt != t)
|
|
|
- rst = rt;
|
|
|
- if (t == 0) {
|
|
|
- t = rst; /* set t to least subtree holding sizes > nb */
|
|
|
- break;
|
|
|
- }
|
|
|
- sizebits <<= 1;
|
|
|
- }
|
|
|
- }
|
|
|
- if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */
|
|
|
- binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap;
|
|
|
- if (leftbits != 0) {
|
|
|
- bindex_t i;
|
|
|
- binmap_t leastbit = least_bit(leftbits);
|
|
|
- compute_bit2idx(leastbit, i);
|
|
|
- t = *treebin_at(m, i);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- while (t != 0) { /* find smallest of tree or subtree */
|
|
|
- size_t trem = chunksize(t) - nb;
|
|
|
- if (trem < rsize) {
|
|
|
- rsize = trem;
|
|
|
- v = t;
|
|
|
- }
|
|
|
- t = leftmost_child(t);
|
|
|
- }
|
|
|
-
|
|
|
- /* If dv is a better fit, return 0 so malloc will use it */
|
|
|
- if (v != 0 && rsize < (size_t)(m->dvsize - nb)) {
|
|
|
- if (RTCHECK(ok_address(m, v))) { /* split */
|
|
|
- mchunkptr r = chunk_plus_offset(v, nb);
|
|
|
- assert(chunksize(v) == rsize + nb);
|
|
|
- if (RTCHECK(ok_next(v, r))) {
|
|
|
- unlink_large_chunk(m, v);
|
|
|
- if (rsize < MIN_CHUNK_SIZE)
|
|
|
- set_inuse_and_pinuse(m, v, (rsize + nb));
|
|
|
- else {
|
|
|
- set_size_and_pinuse_of_inuse_chunk(m, v, nb);
|
|
|
- set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
- insert_chunk(m, r, rsize);
|
|
|
- }
|
|
|
- return chunk2mem(v);
|
|
|
- }
|
|
|
- }
|
|
|
- CORRUPTION_ERROR_ACTION(m);
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* allocate a small request from the best fitting chunk in a treebin */
|
|
|
-static void* tmalloc_small(mstate m, size_t nb) {
|
|
|
- tchunkptr t, v;
|
|
|
- size_t rsize;
|
|
|
- bindex_t i;
|
|
|
- binmap_t leastbit = least_bit(m->treemap);
|
|
|
- compute_bit2idx(leastbit, i);
|
|
|
- v = t = *treebin_at(m, i);
|
|
|
- rsize = chunksize(t) - nb;
|
|
|
-
|
|
|
- while ((t = leftmost_child(t)) != 0) {
|
|
|
- size_t trem = chunksize(t) - nb;
|
|
|
- if (trem < rsize) {
|
|
|
- rsize = trem;
|
|
|
- v = t;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (RTCHECK(ok_address(m, v))) {
|
|
|
- mchunkptr r = chunk_plus_offset(v, nb);
|
|
|
- assert(chunksize(v) == rsize + nb);
|
|
|
- if (RTCHECK(ok_next(v, r))) {
|
|
|
- unlink_large_chunk(m, v);
|
|
|
- if (rsize < MIN_CHUNK_SIZE)
|
|
|
- set_inuse_and_pinuse(m, v, (rsize + nb));
|
|
|
- else {
|
|
|
- set_size_and_pinuse_of_inuse_chunk(m, v, nb);
|
|
|
- set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
- replace_dv(m, r, rsize);
|
|
|
- }
|
|
|
- return chunk2mem(v);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- CORRUPTION_ERROR_ACTION(m);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* --------------------------- realloc support --------------------------- */
|
|
|
-
|
|
|
-static void* internal_realloc(mstate m, void* oldmem, size_t bytes) {
|
|
|
- if (bytes >= MAX_REQUEST) {
|
|
|
- MALLOC_FAILURE_ACTION;
|
|
|
- return 0;
|
|
|
- }
|
|
|
- if (!PREACTION(m)) {
|
|
|
- mchunkptr oldp = mem2chunk(oldmem);
|
|
|
- size_t oldsize = chunksize(oldp);
|
|
|
- mchunkptr next = chunk_plus_offset(oldp, oldsize);
|
|
|
- mchunkptr newp = 0;
|
|
|
- void* extra = 0;
|
|
|
-
|
|
|
- /* Try to either shrink or extend into top. Else malloc-copy-free */
|
|
|
-
|
|
|
- if (RTCHECK(ok_address(m, oldp) && ok_inuse(oldp) &&
|
|
|
- ok_next(oldp, next) && ok_pinuse(next))) {
|
|
|
- size_t nb = request2size(bytes);
|
|
|
- if (is_mmapped(oldp))
|
|
|
- newp = mmap_resize(m, oldp, nb);
|
|
|
- else if (oldsize >= nb) { /* already big enough */
|
|
|
- size_t rsize = oldsize - nb;
|
|
|
- newp = oldp;
|
|
|
- if (rsize >= MIN_CHUNK_SIZE) {
|
|
|
- mchunkptr remainder = chunk_plus_offset(newp, nb);
|
|
|
- set_inuse(m, newp, nb);
|
|
|
- set_inuse_and_pinuse(m, remainder, rsize);
|
|
|
- extra = chunk2mem(remainder);
|
|
|
- }
|
|
|
- }
|
|
|
- else if (next == m->top && oldsize + m->topsize > nb) {
|
|
|
- /* Expand into top */
|
|
|
- size_t newsize = oldsize + m->topsize;
|
|
|
- size_t newtopsize = newsize - nb;
|
|
|
- mchunkptr newtop = chunk_plus_offset(oldp, nb);
|
|
|
- set_inuse(m, oldp, nb);
|
|
|
- newtop->head = newtopsize |PINUSE_BIT;
|
|
|
- m->top = newtop;
|
|
|
- m->topsize = newtopsize;
|
|
|
- newp = oldp;
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- USAGE_ERROR_ACTION(m, oldmem);
|
|
|
- POSTACTION(m);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-#if DEBUG
|
|
|
- if (newp != 0) {
|
|
|
- check_inuse_chunk(m, newp); /* Check requires lock */
|
|
|
- }
|
|
|
-#endif
|
|
|
-
|
|
|
- POSTACTION(m);
|
|
|
-
|
|
|
- if (newp != 0) {
|
|
|
- if (extra != 0) {
|
|
|
- internal_free(m, extra);
|
|
|
- }
|
|
|
- return chunk2mem(newp);
|
|
|
- }
|
|
|
- else {
|
|
|
- void* newmem = internal_malloc(m, bytes);
|
|
|
- if (newmem != 0) {
|
|
|
- size_t oc = oldsize - overhead_for(oldp);
|
|
|
- memcpy(newmem, oldmem, (oc < bytes)? oc : bytes);
|
|
|
- internal_free(m, oldmem);
|
|
|
- }
|
|
|
- return newmem;
|
|
|
- }
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* --------------------------- memalign support -------------------------- */
|
|
|
-
|
|
|
-static void* internal_memalign(mstate m, size_t alignment, size_t bytes) {
|
|
|
- if (alignment <= MALLOC_ALIGNMENT) /* Can just use malloc */
|
|
|
- return internal_malloc(m, bytes);
|
|
|
- if (alignment < MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */
|
|
|
- alignment = MIN_CHUNK_SIZE;
|
|
|
- if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */
|
|
|
- size_t a = MALLOC_ALIGNMENT << 1;
|
|
|
- while (a < alignment) a <<= 1;
|
|
|
- alignment = a;
|
|
|
- }
|
|
|
-
|
|
|
- if (bytes >= MAX_REQUEST - alignment) {
|
|
|
- if (m != 0) { /* Test isn't needed but avoids compiler warning */
|
|
|
- MALLOC_FAILURE_ACTION;
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- size_t nb = request2size(bytes);
|
|
|
- size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD;
|
|
|
- char* mem = (char*)internal_malloc(m, req);
|
|
|
- if (mem != 0) {
|
|
|
- void* leader = 0;
|
|
|
- void* trailer = 0;
|
|
|
- mchunkptr p = mem2chunk(mem);
|
|
|
-
|
|
|
- if (PREACTION(m)) return 0;
|
|
|
- if ((((size_t)(mem)) % alignment) != 0) { /* misaligned */
|
|
|
- /*
|
|
|
- Find an aligned spot inside chunk. Since we need to give
|
|
|
- back leading space in a chunk of at least MIN_CHUNK_SIZE, if
|
|
|
- the first calculation places us at a spot with less than
|
|
|
- MIN_CHUNK_SIZE leader, we can move to the next aligned spot.
|
|
|
- We've allocated enough total room so that this is always
|
|
|
- possible.
|
|
|
- */
|
|
|
- char* br = (char*)mem2chunk((size_t)(((size_t)(mem +
|
|
|
- alignment -
|
|
|
- SIZE_T_ONE)) &
|
|
|
- -alignment));
|
|
|
- char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)?
|
|
|
- br : br+alignment;
|
|
|
- mchunkptr newp = (mchunkptr)pos;
|
|
|
- size_t leadsize = pos - (char*)(p);
|
|
|
- size_t newsize = chunksize(p) - leadsize;
|
|
|
-
|
|
|
- if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */
|
|
|
- newp->prev_foot = p->prev_foot + leadsize;
|
|
|
- newp->head = newsize;
|
|
|
- }
|
|
|
- else { /* Otherwise, give back leader, use the rest */
|
|
|
- set_inuse(m, newp, newsize);
|
|
|
- set_inuse(m, p, leadsize);
|
|
|
- leader = chunk2mem(p);
|
|
|
- }
|
|
|
- p = newp;
|
|
|
- }
|
|
|
-
|
|
|
- /* Give back spare room at the end */
|
|
|
- if (!is_mmapped(p)) {
|
|
|
- size_t size = chunksize(p);
|
|
|
- if (size > nb + MIN_CHUNK_SIZE) {
|
|
|
- size_t remainder_size = size - nb;
|
|
|
- mchunkptr remainder = chunk_plus_offset(p, nb);
|
|
|
- set_inuse(m, p, nb);
|
|
|
- set_inuse(m, remainder, remainder_size);
|
|
|
- trailer = chunk2mem(remainder);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- assert (chunksize(p) >= nb);
|
|
|
- assert((((size_t)(chunk2mem(p))) % alignment) == 0);
|
|
|
- check_inuse_chunk(m, p);
|
|
|
- POSTACTION(m);
|
|
|
- if (leader != 0) {
|
|
|
- internal_free(m, leader);
|
|
|
- }
|
|
|
- if (trailer != 0) {
|
|
|
- internal_free(m, trailer);
|
|
|
- }
|
|
|
- return chunk2mem(p);
|
|
|
- }
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* ------------------------ comalloc/coalloc support --------------------- */
|
|
|
-
|
|
|
-static void** ialloc(mstate m,
|
|
|
- size_t n_elements,
|
|
|
- size_t* sizes,
|
|
|
- int opts,
|
|
|
- void* chunks[]) {
|
|
|
- /*
|
|
|
- This provides common support for independent_X routines, handling
|
|
|
- all of the combinations that can result.
|
|
|
-
|
|
|
- The opts arg has:
|
|
|
- bit 0 set if all elements are same size (using sizes[0])
|
|
|
- bit 1 set if elements should be zeroed
|
|
|
- */
|
|
|
-
|
|
|
- size_t element_size; /* chunksize of each element, if all same */
|
|
|
- size_t contents_size; /* total size of elements */
|
|
|
- size_t array_size; /* request size of pointer array */
|
|
|
- void* mem; /* malloced aggregate space */
|
|
|
- mchunkptr p; /* corresponding chunk */
|
|
|
- size_t remainder_size; /* remaining bytes while splitting */
|
|
|
- void** marray; /* either "chunks" or malloced ptr array */
|
|
|
- mchunkptr array_chunk; /* chunk for malloced ptr array */
|
|
|
- flag_t was_enabled; /* to disable mmap */
|
|
|
- size_t size;
|
|
|
- size_t i;
|
|
|
-
|
|
|
- ensure_initialization();
|
|
|
- /* compute array length, if needed */
|
|
|
- if (chunks != 0) {
|
|
|
- if (n_elements == 0)
|
|
|
- return chunks; /* nothing to do */
|
|
|
- marray = chunks;
|
|
|
- array_size = 0;
|
|
|
- }
|
|
|
- else {
|
|
|
- /* if empty req, must still return chunk representing empty array */
|
|
|
- if (n_elements == 0)
|
|
|
- return (void**)internal_malloc(m, 0);
|
|
|
- marray = 0;
|
|
|
- array_size = request2size(n_elements * (sizeof(void*)));
|
|
|
- }
|
|
|
-
|
|
|
- /* compute total element size */
|
|
|
- if (opts & 0x1) { /* all-same-size */
|
|
|
- element_size = request2size(*sizes);
|
|
|
- contents_size = n_elements * element_size;
|
|
|
- }
|
|
|
- else { /* add up all the sizes */
|
|
|
- element_size = 0;
|
|
|
- contents_size = 0;
|
|
|
- for (i = 0; i != n_elements; ++i)
|
|
|
- contents_size += request2size(sizes[i]);
|
|
|
- }
|
|
|
-
|
|
|
- size = contents_size + array_size;
|
|
|
-
|
|
|
- /*
|
|
|
- Allocate the aggregate chunk. First disable direct-mmapping so
|
|
|
- malloc won't use it, since we would not be able to later
|
|
|
- free/realloc space internal to a segregated mmap region.
|
|
|
- */
|
|
|
- was_enabled = use_mmap(m);
|
|
|
- disable_mmap(m);
|
|
|
- mem = internal_malloc(m, size - CHUNK_OVERHEAD);
|
|
|
- if (was_enabled)
|
|
|
- enable_mmap(m);
|
|
|
- if (mem == 0)
|
|
|
- return 0;
|
|
|
-
|
|
|
- if (PREACTION(m)) return 0;
|
|
|
- p = mem2chunk(mem);
|
|
|
- remainder_size = chunksize(p);
|
|
|
-
|
|
|
- assert(!is_mmapped(p));
|
|
|
-
|
|
|
- if (opts & 0x2) { /* optionally clear the elements */
|
|
|
- memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size);
|
|
|
- }
|
|
|
-
|
|
|
- /* If not provided, allocate the pointer array as final part of chunk */
|
|
|
- if (marray == 0) {
|
|
|
- size_t array_chunk_size;
|
|
|
- array_chunk = chunk_plus_offset(p, contents_size);
|
|
|
- array_chunk_size = remainder_size - contents_size;
|
|
|
- marray = (void**) (chunk2mem(array_chunk));
|
|
|
- set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size);
|
|
|
- remainder_size = contents_size;
|
|
|
- }
|
|
|
-
|
|
|
- /* split out elements */
|
|
|
- for (i = 0; ; ++i) {
|
|
|
- marray[i] = chunk2mem(p);
|
|
|
- if (i != n_elements-1) {
|
|
|
- if (element_size != 0)
|
|
|
- size = element_size;
|
|
|
- else
|
|
|
- size = request2size(sizes[i]);
|
|
|
- remainder_size -= size;
|
|
|
- set_size_and_pinuse_of_inuse_chunk(m, p, size);
|
|
|
- p = chunk_plus_offset(p, size);
|
|
|
- }
|
|
|
- else { /* the final element absorbs any overallocation slop */
|
|
|
- set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size);
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-#if DEBUG
|
|
|
- if (marray != chunks) {
|
|
|
- /* final element must have exactly exhausted chunk */
|
|
|
- if (element_size != 0) {
|
|
|
- assert(remainder_size == element_size);
|
|
|
- }
|
|
|
- else {
|
|
|
- assert(remainder_size == request2size(sizes[i]));
|
|
|
- }
|
|
|
- check_inuse_chunk(m, mem2chunk(marray));
|
|
|
- }
|
|
|
- for (i = 0; i != n_elements; ++i)
|
|
|
- check_inuse_chunk(m, mem2chunk(marray[i]));
|
|
|
-
|
|
|
-#endif /* DEBUG */
|
|
|
-
|
|
|
- POSTACTION(m);
|
|
|
- return marray;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/* -------------------------- public routines ---------------------------- */
|
|
|
-
|
|
|
-#if !ONLY_MSPACES
|
|
|
-
|
|
|
-void* dlmalloc(size_t bytes) {
|
|
|
- /*
|
|
|
- Basic algorithm:
|
|
|
- If a small request (< 256 bytes minus per-chunk overhead):
|
|
|
- 1. If one exists, use a remainderless chunk in associated smallbin.
|
|
|
- (Remainderless means that there are too few excess bytes to
|
|
|
- represent as a chunk.)
|
|
|
- 2. If it is big enough, use the dv chunk, which is normally the
|
|
|
- chunk adjacent to the one used for the most recent small request.
|
|
|
- 3. If one exists, split the smallest available chunk in a bin,
|
|
|
- saving remainder in dv.
|
|
|
- 4. If it is big enough, use the top chunk.
|
|
|
- 5. If available, get memory from system and use it
|
|
|
- Otherwise, for a large request:
|
|
|
- 1. Find the smallest available binned chunk that fits, and use it
|
|
|
- if it is better fitting than dv chunk, splitting if necessary.
|
|
|
- 2. If better fitting than any binned chunk, use the dv chunk.
|
|
|
- 3. If it is big enough, use the top chunk.
|
|
|
- 4. If request size >= mmap threshold, try to directly mmap this chunk.
|
|
|
- 5. If available, get memory from system and use it
|
|
|
-
|
|
|
- The ugly goto's here ensure that postaction occurs along all paths.
|
|
|
- */
|
|
|
-
|
|
|
-#if USE_LOCKS
|
|
|
- ensure_initialization(); /* initialize in sys_alloc if not using locks */
|
|
|
-#endif
|
|
|
-
|
|
|
- if (!PREACTION(gm)) {
|
|
|
- void* mem;
|
|
|
- size_t nb;
|
|
|
- if (bytes <= MAX_SMALL_REQUEST) {
|
|
|
- bindex_t idx;
|
|
|
- binmap_t smallbits;
|
|
|
- nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
|
|
|
- idx = small_index(nb);
|
|
|
- smallbits = gm->smallmap >> idx;
|
|
|
-
|
|
|
- if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
|
|
|
- mchunkptr b, p;
|
|
|
- idx += ~smallbits & 1; /* Uses next bin if idx empty */
|
|
|
- b = smallbin_at(gm, idx);
|
|
|
- p = b->fd;
|
|
|
- assert(chunksize(p) == small_index2size(idx));
|
|
|
- unlink_first_small_chunk(gm, b, p, idx);
|
|
|
- set_inuse_and_pinuse(gm, p, small_index2size(idx));
|
|
|
- mem = chunk2mem(p);
|
|
|
- check_malloced_chunk(gm, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
-
|
|
|
- else if (nb > gm->dvsize) {
|
|
|
- if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
|
|
|
- mchunkptr b, p, r;
|
|
|
- size_t rsize;
|
|
|
- bindex_t i;
|
|
|
- binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
|
|
|
- binmap_t leastbit = least_bit(leftbits);
|
|
|
- compute_bit2idx(leastbit, i);
|
|
|
- b = smallbin_at(gm, i);
|
|
|
- p = b->fd;
|
|
|
- assert(chunksize(p) == small_index2size(i));
|
|
|
- unlink_first_small_chunk(gm, b, p, i);
|
|
|
- rsize = small_index2size(i) - nb;
|
|
|
- /* Fit here cannot be remainderless if 4byte sizes */
|
|
|
- if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
|
|
|
- set_inuse_and_pinuse(gm, p, small_index2size(i));
|
|
|
- else {
|
|
|
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
|
|
|
- r = chunk_plus_offset(p, nb);
|
|
|
- set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
- replace_dv(gm, r, rsize);
|
|
|
- }
|
|
|
- mem = chunk2mem(p);
|
|
|
- check_malloced_chunk(gm, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
-
|
|
|
- else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) {
|
|
|
- check_malloced_chunk(gm, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- else if (bytes >= MAX_REQUEST)
|
|
|
- nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
|
|
|
- else {
|
|
|
- nb = pad_request(bytes);
|
|
|
- if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) {
|
|
|
- check_malloced_chunk(gm, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (nb <= gm->dvsize) {
|
|
|
- size_t rsize = gm->dvsize - nb;
|
|
|
- mchunkptr p = gm->dv;
|
|
|
- if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
|
|
|
- mchunkptr r = gm->dv = chunk_plus_offset(p, nb);
|
|
|
- gm->dvsize = rsize;
|
|
|
- set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
|
|
|
- }
|
|
|
- else { /* exhaust dv */
|
|
|
- size_t dvs = gm->dvsize;
|
|
|
- gm->dvsize = 0;
|
|
|
- gm->dv = 0;
|
|
|
- set_inuse_and_pinuse(gm, p, dvs);
|
|
|
- }
|
|
|
- mem = chunk2mem(p);
|
|
|
- check_malloced_chunk(gm, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
-
|
|
|
- else if (nb < gm->topsize) { /* Split top */
|
|
|
- size_t rsize = gm->topsize -= nb;
|
|
|
- mchunkptr p = gm->top;
|
|
|
- mchunkptr r = gm->top = chunk_plus_offset(p, nb);
|
|
|
- r->head = rsize | PINUSE_BIT;
|
|
|
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
|
|
|
- mem = chunk2mem(p);
|
|
|
- check_top_chunk(gm, gm->top);
|
|
|
- check_malloced_chunk(gm, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
-
|
|
|
- mem = sys_alloc(gm, nb);
|
|
|
-
|
|
|
- postaction:
|
|
|
- POSTACTION(gm);
|
|
|
- return mem;
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-void dlfree(void* mem) {
|
|
|
- /*
|
|
|
- Consolidate freed chunks with preceeding or succeeding bordering
|
|
|
- free chunks, if they exist, and then place in a bin. Intermixed
|
|
|
- with special cases for top, dv, mmapped chunks, and usage errors.
|
|
|
- */
|
|
|
-
|
|
|
- if (mem != 0) {
|
|
|
- mchunkptr p = mem2chunk(mem);
|
|
|
-#if FOOTERS
|
|
|
- mstate fm = get_mstate_for(p);
|
|
|
- if (!ok_magic(fm)) {
|
|
|
- USAGE_ERROR_ACTION(fm, p);
|
|
|
- return;
|
|
|
- }
|
|
|
-#else /* FOOTERS */
|
|
|
-#define fm gm
|
|
|
-#endif /* FOOTERS */
|
|
|
- if (!PREACTION(fm)) {
|
|
|
- check_inuse_chunk(fm, p);
|
|
|
- if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {
|
|
|
- size_t psize = chunksize(p);
|
|
|
- mchunkptr next = chunk_plus_offset(p, psize);
|
|
|
- if (!pinuse(p)) {
|
|
|
- size_t prevsize = p->prev_foot;
|
|
|
- if (is_mmapped(p)) {
|
|
|
- psize += prevsize + MMAP_FOOT_PAD;
|
|
|
- if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
|
|
|
- fm->footprint -= psize;
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- else {
|
|
|
- mchunkptr prev = chunk_minus_offset(p, prevsize);
|
|
|
- psize += prevsize;
|
|
|
- p = prev;
|
|
|
- if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
|
|
|
- if (p != fm->dv) {
|
|
|
- unlink_chunk(fm, p, prevsize);
|
|
|
- }
|
|
|
- else if ((next->head & INUSE_BITS) == INUSE_BITS) {
|
|
|
- fm->dvsize = psize;
|
|
|
- set_free_with_pinuse(p, psize, next);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- goto erroraction;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
|
|
|
- if (!cinuse(next)) { /* consolidate forward */
|
|
|
- if (next == fm->top) {
|
|
|
- size_t tsize = fm->topsize += psize;
|
|
|
- fm->top = p;
|
|
|
- p->head = tsize | PINUSE_BIT;
|
|
|
- if (p == fm->dv) {
|
|
|
- fm->dv = 0;
|
|
|
- fm->dvsize = 0;
|
|
|
- }
|
|
|
- if (should_trim(fm, tsize))
|
|
|
- sys_trim(fm, 0);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- else if (next == fm->dv) {
|
|
|
- size_t dsize = fm->dvsize += psize;
|
|
|
- fm->dv = p;
|
|
|
- set_size_and_pinuse_of_free_chunk(p, dsize);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- else {
|
|
|
- size_t nsize = chunksize(next);
|
|
|
- psize += nsize;
|
|
|
- unlink_chunk(fm, next, nsize);
|
|
|
- set_size_and_pinuse_of_free_chunk(p, psize);
|
|
|
- if (p == fm->dv) {
|
|
|
- fm->dvsize = psize;
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- set_free_with_pinuse(p, psize, next);
|
|
|
-
|
|
|
- if (is_small(psize)) {
|
|
|
- insert_small_chunk(fm, p, psize);
|
|
|
- check_free_chunk(fm, p);
|
|
|
- }
|
|
|
- else {
|
|
|
- tchunkptr tp = (tchunkptr)p;
|
|
|
- insert_large_chunk(fm, tp, psize);
|
|
|
- check_free_chunk(fm, p);
|
|
|
- if (--fm->release_checks == 0)
|
|
|
- release_unused_segments(fm);
|
|
|
- }
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
- erroraction:
|
|
|
- USAGE_ERROR_ACTION(fm, p);
|
|
|
- postaction:
|
|
|
- POSTACTION(fm);
|
|
|
- }
|
|
|
- }
|
|
|
-#if !FOOTERS
|
|
|
-#undef fm
|
|
|
-#endif /* FOOTERS */
|
|
|
-}
|
|
|
-
|
|
|
-void* dlcalloc(size_t n_elements, size_t elem_size) {
|
|
|
- void* mem;
|
|
|
- size_t req = 0;
|
|
|
- if (n_elements != 0) {
|
|
|
- req = n_elements * elem_size;
|
|
|
- if (((n_elements | elem_size) & ~(size_t)0xffff) &&
|
|
|
- (req / n_elements != elem_size))
|
|
|
- req = MAX_SIZE_T; /* force downstream failure on overflow */
|
|
|
- }
|
|
|
- mem = dlmalloc(req);
|
|
|
- if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
|
|
|
- memset(mem, 0, req);
|
|
|
- return mem;
|
|
|
-}
|
|
|
-
|
|
|
-void* dlrealloc(void* oldmem, size_t bytes) {
|
|
|
- if (oldmem == 0)
|
|
|
- return dlmalloc(bytes);
|
|
|
-#ifdef REALLOC_ZERO_BYTES_FREES
|
|
|
- if (bytes == 0) {
|
|
|
- dlfree(oldmem);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-#endif /* REALLOC_ZERO_BYTES_FREES */
|
|
|
- else {
|
|
|
-#if ! FOOTERS
|
|
|
- mstate m = gm;
|
|
|
-#else /* FOOTERS */
|
|
|
- mstate m = get_mstate_for(mem2chunk(oldmem));
|
|
|
- if (!ok_magic(m)) {
|
|
|
- USAGE_ERROR_ACTION(m, oldmem);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-#endif /* FOOTERS */
|
|
|
- return internal_realloc(m, oldmem, bytes);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-void* dlmemalign(size_t alignment, size_t bytes) {
|
|
|
- return internal_memalign(gm, alignment, bytes);
|
|
|
-}
|
|
|
-
|
|
|
-void** dlindependent_calloc(size_t n_elements, size_t elem_size,
|
|
|
- void* chunks[]) {
|
|
|
- size_t sz = elem_size; /* serves as 1-element array */
|
|
|
- return ialloc(gm, n_elements, &sz, 3, chunks);
|
|
|
-}
|
|
|
-
|
|
|
-void** dlindependent_comalloc(size_t n_elements, size_t sizes[],
|
|
|
- void* chunks[]) {
|
|
|
- return ialloc(gm, n_elements, sizes, 0, chunks);
|
|
|
-}
|
|
|
-
|
|
|
-void* dlvalloc(size_t bytes) {
|
|
|
- size_t pagesz;
|
|
|
- ensure_initialization();
|
|
|
- pagesz = mparams.page_size;
|
|
|
- return dlmemalign(pagesz, bytes);
|
|
|
-}
|
|
|
-
|
|
|
-void* dlpvalloc(size_t bytes) {
|
|
|
- size_t pagesz;
|
|
|
- ensure_initialization();
|
|
|
- pagesz = mparams.page_size;
|
|
|
- return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE));
|
|
|
-}
|
|
|
-
|
|
|
-int dlmalloc_trim(size_t pad) {
|
|
|
- int result = 0;
|
|
|
- ensure_initialization();
|
|
|
- if (!PREACTION(gm)) {
|
|
|
- result = sys_trim(gm, pad);
|
|
|
- POSTACTION(gm);
|
|
|
- }
|
|
|
- return result;
|
|
|
-}
|
|
|
-
|
|
|
-size_t dlmalloc_footprint(void) {
|
|
|
- return gm->footprint;
|
|
|
-}
|
|
|
-
|
|
|
-size_t dlmalloc_max_footprint(void) {
|
|
|
- return gm->max_footprint;
|
|
|
-}
|
|
|
-
|
|
|
-#if !NO_MALLINFO
|
|
|
-struct mallinfo dlmallinfo(void) {
|
|
|
- return internal_mallinfo(gm);
|
|
|
-}
|
|
|
-#endif /* NO_MALLINFO */
|
|
|
-
|
|
|
-void dlmalloc_stats() {
|
|
|
- internal_malloc_stats(gm);
|
|
|
-}
|
|
|
-
|
|
|
-int dlmallopt(int param_number, int value) {
|
|
|
- return change_mparam(param_number, value);
|
|
|
-}
|
|
|
-
|
|
|
-#endif /* !ONLY_MSPACES */
|
|
|
-
|
|
|
-size_t dlmalloc_usable_size(void* mem) {
|
|
|
- if (mem != 0) {
|
|
|
- mchunkptr p = mem2chunk(mem);
|
|
|
- if (is_inuse(p))
|
|
|
- return chunksize(p) - overhead_for(p);
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* ----------------------------- user mspaces ---------------------------- */
|
|
|
-
|
|
|
-#if MSPACES
|
|
|
-
|
|
|
-static mstate init_user_mstate(char* tbase, size_t tsize) {
|
|
|
- size_t msize = pad_request(sizeof(struct malloc_state));
|
|
|
- mchunkptr mn;
|
|
|
- mchunkptr msp = align_as_chunk(tbase);
|
|
|
- mstate m = (mstate)(chunk2mem(msp));
|
|
|
- memset(m, 0, msize);
|
|
|
- INITIAL_LOCK(&m->mutex);
|
|
|
- msp->head = (msize|INUSE_BITS);
|
|
|
- m->seg.base = m->least_addr = tbase;
|
|
|
- m->seg.size = m->footprint = m->max_footprint = tsize;
|
|
|
- m->magic = mparams.magic;
|
|
|
- m->release_checks = MAX_RELEASE_CHECK_RATE;
|
|
|
- m->mflags = mparams.default_mflags;
|
|
|
- m->extp = 0;
|
|
|
- m->exts = 0;
|
|
|
- disable_contiguous(m);
|
|
|
- init_bins(m);
|
|
|
- mn = next_chunk(mem2chunk(m));
|
|
|
- init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE);
|
|
|
- check_top_chunk(m, m->top);
|
|
|
- return m;
|
|
|
-}
|
|
|
-
|
|
|
-mspace create_mspace(size_t capacity, int locked) {
|
|
|
- mstate m = 0;
|
|
|
- size_t msize;
|
|
|
- ensure_initialization();
|
|
|
- msize = pad_request(sizeof(struct malloc_state));
|
|
|
- if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
|
|
|
- size_t rs = ((capacity == 0)? mparams.granularity :
|
|
|
- (capacity + TOP_FOOT_SIZE + msize));
|
|
|
- size_t tsize = granularity_align(rs);
|
|
|
- char* tbase = (char*)(CALL_MMAP(tsize));
|
|
|
- if (tbase != CMFAIL) {
|
|
|
- m = init_user_mstate(tbase, tsize);
|
|
|
- m->seg.sflags = USE_MMAP_BIT;
|
|
|
- set_lock(m, locked);
|
|
|
- }
|
|
|
- }
|
|
|
- return (mspace)m;
|
|
|
-}
|
|
|
-
|
|
|
-mspace create_mspace_with_base(void* base, size_t capacity, int locked) {
|
|
|
- mstate m = 0;
|
|
|
- size_t msize;
|
|
|
- ensure_initialization();
|
|
|
- msize = pad_request(sizeof(struct malloc_state));
|
|
|
- if (capacity > msize + TOP_FOOT_SIZE &&
|
|
|
- capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
|
|
|
- m = init_user_mstate((char*)base, capacity);
|
|
|
- m->seg.sflags = EXTERN_BIT;
|
|
|
- set_lock(m, locked);
|
|
|
- }
|
|
|
- return (mspace)m;
|
|
|
-}
|
|
|
-
|
|
|
-int mspace_track_large_chunks(mspace msp, int enable) {
|
|
|
- int ret = 0;
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (!PREACTION(ms)) {
|
|
|
- if (!use_mmap(ms))
|
|
|
- ret = 1;
|
|
|
- if (!enable)
|
|
|
- enable_mmap(ms);
|
|
|
- else
|
|
|
- disable_mmap(ms);
|
|
|
- POSTACTION(ms);
|
|
|
- }
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-size_t destroy_mspace(mspace msp) {
|
|
|
- size_t freed = 0;
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (ok_magic(ms)) {
|
|
|
- msegmentptr sp = &ms->seg;
|
|
|
- while (sp != 0) {
|
|
|
- char* base = sp->base;
|
|
|
- size_t size = sp->size;
|
|
|
- flag_t flag = sp->sflags;
|
|
|
- sp = sp->next;
|
|
|
- if ((flag & USE_MMAP_BIT) && !(flag & EXTERN_BIT) &&
|
|
|
- CALL_MUNMAP(base, size) == 0)
|
|
|
- freed += size;
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- }
|
|
|
- return freed;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- mspace versions of routines are near-clones of the global
|
|
|
- versions. This is not so nice but better than the alternatives.
|
|
|
-*/
|
|
|
-
|
|
|
-
|
|
|
-void* mspace_malloc(mspace msp, size_t bytes) {
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (!ok_magic(ms)) {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- return 0;
|
|
|
- }
|
|
|
- if (!PREACTION(ms)) {
|
|
|
- void* mem;
|
|
|
- size_t nb;
|
|
|
- if (bytes <= MAX_SMALL_REQUEST) {
|
|
|
- bindex_t idx;
|
|
|
- binmap_t smallbits;
|
|
|
- nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
|
|
|
- idx = small_index(nb);
|
|
|
- smallbits = ms->smallmap >> idx;
|
|
|
-
|
|
|
- if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
|
|
|
- mchunkptr b, p;
|
|
|
- idx += ~smallbits & 1; /* Uses next bin if idx empty */
|
|
|
- b = smallbin_at(ms, idx);
|
|
|
- p = b->fd;
|
|
|
- assert(chunksize(p) == small_index2size(idx));
|
|
|
- unlink_first_small_chunk(ms, b, p, idx);
|
|
|
- set_inuse_and_pinuse(ms, p, small_index2size(idx));
|
|
|
- mem = chunk2mem(p);
|
|
|
- check_malloced_chunk(ms, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
-
|
|
|
- else if (nb > ms->dvsize) {
|
|
|
- if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
|
|
|
- mchunkptr b, p, r;
|
|
|
- size_t rsize;
|
|
|
- bindex_t i;
|
|
|
- binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
|
|
|
- binmap_t leastbit = least_bit(leftbits);
|
|
|
- compute_bit2idx(leastbit, i);
|
|
|
- b = smallbin_at(ms, i);
|
|
|
- p = b->fd;
|
|
|
- assert(chunksize(p) == small_index2size(i));
|
|
|
- unlink_first_small_chunk(ms, b, p, i);
|
|
|
- rsize = small_index2size(i) - nb;
|
|
|
- /* Fit here cannot be remainderless if 4byte sizes */
|
|
|
- if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
|
|
|
- set_inuse_and_pinuse(ms, p, small_index2size(i));
|
|
|
- else {
|
|
|
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
|
|
|
- r = chunk_plus_offset(p, nb);
|
|
|
- set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
- replace_dv(ms, r, rsize);
|
|
|
- }
|
|
|
- mem = chunk2mem(p);
|
|
|
- check_malloced_chunk(ms, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
-
|
|
|
- else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) {
|
|
|
- check_malloced_chunk(ms, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- else if (bytes >= MAX_REQUEST)
|
|
|
- nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
|
|
|
- else {
|
|
|
- nb = pad_request(bytes);
|
|
|
- if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) {
|
|
|
- check_malloced_chunk(ms, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (nb <= ms->dvsize) {
|
|
|
- size_t rsize = ms->dvsize - nb;
|
|
|
- mchunkptr p = ms->dv;
|
|
|
- if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
|
|
|
- mchunkptr r = ms->dv = chunk_plus_offset(p, nb);
|
|
|
- ms->dvsize = rsize;
|
|
|
- set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
|
|
|
- }
|
|
|
- else { /* exhaust dv */
|
|
|
- size_t dvs = ms->dvsize;
|
|
|
- ms->dvsize = 0;
|
|
|
- ms->dv = 0;
|
|
|
- set_inuse_and_pinuse(ms, p, dvs);
|
|
|
- }
|
|
|
- mem = chunk2mem(p);
|
|
|
- check_malloced_chunk(ms, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
-
|
|
|
- else if (nb < ms->topsize) { /* Split top */
|
|
|
- size_t rsize = ms->topsize -= nb;
|
|
|
- mchunkptr p = ms->top;
|
|
|
- mchunkptr r = ms->top = chunk_plus_offset(p, nb);
|
|
|
- r->head = rsize | PINUSE_BIT;
|
|
|
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
|
|
|
- mem = chunk2mem(p);
|
|
|
- check_top_chunk(ms, ms->top);
|
|
|
- check_malloced_chunk(ms, mem, nb);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
-
|
|
|
- mem = sys_alloc(ms, nb);
|
|
|
-
|
|
|
- postaction:
|
|
|
- POSTACTION(ms);
|
|
|
- return mem;
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-void mspace_free(mspace msp, void* mem) {
|
|
|
- if (mem != 0) {
|
|
|
- mchunkptr p = mem2chunk(mem);
|
|
|
-#if FOOTERS
|
|
|
- mstate fm = get_mstate_for(p);
|
|
|
- msp = msp; /* placate people compiling -Wunused */
|
|
|
-#else /* FOOTERS */
|
|
|
- mstate fm = (mstate)msp;
|
|
|
-#endif /* FOOTERS */
|
|
|
- if (!ok_magic(fm)) {
|
|
|
- USAGE_ERROR_ACTION(fm, p);
|
|
|
- return;
|
|
|
- }
|
|
|
- if (!PREACTION(fm)) {
|
|
|
- check_inuse_chunk(fm, p);
|
|
|
- if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {
|
|
|
- size_t psize = chunksize(p);
|
|
|
- mchunkptr next = chunk_plus_offset(p, psize);
|
|
|
- if (!pinuse(p)) {
|
|
|
- size_t prevsize = p->prev_foot;
|
|
|
- if (is_mmapped(p)) {
|
|
|
- psize += prevsize + MMAP_FOOT_PAD;
|
|
|
- if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
|
|
|
- fm->footprint -= psize;
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- else {
|
|
|
- mchunkptr prev = chunk_minus_offset(p, prevsize);
|
|
|
- psize += prevsize;
|
|
|
- p = prev;
|
|
|
- if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
|
|
|
- if (p != fm->dv) {
|
|
|
- unlink_chunk(fm, p, prevsize);
|
|
|
- }
|
|
|
- else if ((next->head & INUSE_BITS) == INUSE_BITS) {
|
|
|
- fm->dvsize = psize;
|
|
|
- set_free_with_pinuse(p, psize, next);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- goto erroraction;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
|
|
|
- if (!cinuse(next)) { /* consolidate forward */
|
|
|
- if (next == fm->top) {
|
|
|
- size_t tsize = fm->topsize += psize;
|
|
|
- fm->top = p;
|
|
|
- p->head = tsize | PINUSE_BIT;
|
|
|
- if (p == fm->dv) {
|
|
|
- fm->dv = 0;
|
|
|
- fm->dvsize = 0;
|
|
|
- }
|
|
|
- if (should_trim(fm, tsize))
|
|
|
- sys_trim(fm, 0);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- else if (next == fm->dv) {
|
|
|
- size_t dsize = fm->dvsize += psize;
|
|
|
- fm->dv = p;
|
|
|
- set_size_and_pinuse_of_free_chunk(p, dsize);
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- else {
|
|
|
- size_t nsize = chunksize(next);
|
|
|
- psize += nsize;
|
|
|
- unlink_chunk(fm, next, nsize);
|
|
|
- set_size_and_pinuse_of_free_chunk(p, psize);
|
|
|
- if (p == fm->dv) {
|
|
|
- fm->dvsize = psize;
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- set_free_with_pinuse(p, psize, next);
|
|
|
-
|
|
|
- if (is_small(psize)) {
|
|
|
- insert_small_chunk(fm, p, psize);
|
|
|
- check_free_chunk(fm, p);
|
|
|
- }
|
|
|
- else {
|
|
|
- tchunkptr tp = (tchunkptr)p;
|
|
|
- insert_large_chunk(fm, tp, psize);
|
|
|
- check_free_chunk(fm, p);
|
|
|
- if (--fm->release_checks == 0)
|
|
|
- release_unused_segments(fm);
|
|
|
- }
|
|
|
- goto postaction;
|
|
|
- }
|
|
|
- }
|
|
|
- erroraction:
|
|
|
- USAGE_ERROR_ACTION(fm, p);
|
|
|
- postaction:
|
|
|
- POSTACTION(fm);
|
|
|
- }
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) {
|
|
|
- void* mem;
|
|
|
- size_t req = 0;
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (!ok_magic(ms)) {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- return 0;
|
|
|
- }
|
|
|
- if (n_elements != 0) {
|
|
|
- req = n_elements * elem_size;
|
|
|
- if (((n_elements | elem_size) & ~(size_t)0xffff) &&
|
|
|
- (req / n_elements != elem_size))
|
|
|
- req = MAX_SIZE_T; /* force downstream failure on overflow */
|
|
|
- }
|
|
|
- mem = internal_malloc(ms, req);
|
|
|
- if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
|
|
|
- memset(mem, 0, req);
|
|
|
- return mem;
|
|
|
-}
|
|
|
-
|
|
|
-void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) {
|
|
|
- if (oldmem == 0)
|
|
|
- return mspace_malloc(msp, bytes);
|
|
|
-#ifdef REALLOC_ZERO_BYTES_FREES
|
|
|
- if (bytes == 0) {
|
|
|
- mspace_free(msp, oldmem);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-#endif /* REALLOC_ZERO_BYTES_FREES */
|
|
|
- else {
|
|
|
-#if FOOTERS
|
|
|
- mchunkptr p = mem2chunk(oldmem);
|
|
|
- mstate ms = get_mstate_for(p);
|
|
|
-#else /* FOOTERS */
|
|
|
- mstate ms = (mstate)msp;
|
|
|
-#endif /* FOOTERS */
|
|
|
- if (!ok_magic(ms)) {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- return 0;
|
|
|
- }
|
|
|
- return internal_realloc(ms, oldmem, bytes);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) {
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (!ok_magic(ms)) {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- return 0;
|
|
|
- }
|
|
|
- return internal_memalign(ms, alignment, bytes);
|
|
|
-}
|
|
|
-
|
|
|
-void** mspace_independent_calloc(mspace msp, size_t n_elements,
|
|
|
- size_t elem_size, void* chunks[]) {
|
|
|
- size_t sz = elem_size; /* serves as 1-element array */
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (!ok_magic(ms)) {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- return 0;
|
|
|
- }
|
|
|
- return ialloc(ms, n_elements, &sz, 3, chunks);
|
|
|
-}
|
|
|
-
|
|
|
-void** mspace_independent_comalloc(mspace msp, size_t n_elements,
|
|
|
- size_t sizes[], void* chunks[]) {
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (!ok_magic(ms)) {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- return 0;
|
|
|
- }
|
|
|
- return ialloc(ms, n_elements, sizes, 0, chunks);
|
|
|
-}
|
|
|
-
|
|
|
-int mspace_trim(mspace msp, size_t pad) {
|
|
|
- int result = 0;
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (ok_magic(ms)) {
|
|
|
- if (!PREACTION(ms)) {
|
|
|
- result = sys_trim(ms, pad);
|
|
|
- POSTACTION(ms);
|
|
|
- }
|
|
|
- }
|
|
|
- else {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- }
|
|
|
- return result;
|
|
|
-}
|
|
|
-
|
|
|
-void mspace_malloc_stats(mspace msp) {
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (ok_magic(ms)) {
|
|
|
- internal_malloc_stats(ms);
|
|
|
- }
|
|
|
- else {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-size_t mspace_footprint(mspace msp) {
|
|
|
- size_t result = 0;
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (ok_magic(ms)) {
|
|
|
- result = ms->footprint;
|
|
|
- }
|
|
|
- else {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- }
|
|
|
- return result;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-size_t mspace_max_footprint(mspace msp) {
|
|
|
- size_t result = 0;
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (ok_magic(ms)) {
|
|
|
- result = ms->max_footprint;
|
|
|
- }
|
|
|
- else {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- }
|
|
|
- return result;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-#if !NO_MALLINFO
|
|
|
-struct mallinfo mspace_mallinfo(mspace msp) {
|
|
|
- mstate ms = (mstate)msp;
|
|
|
- if (!ok_magic(ms)) {
|
|
|
- USAGE_ERROR_ACTION(ms,ms);
|
|
|
- }
|
|
|
- return internal_mallinfo(ms);
|
|
|
-}
|
|
|
-#endif /* NO_MALLINFO */
|
|
|
-
|
|
|
-size_t mspace_usable_size(void* mem) {
|
|
|
- if (mem != 0) {
|
|
|
- mchunkptr p = mem2chunk(mem);
|
|
|
- if (is_inuse(p))
|
|
|
- return chunksize(p) - overhead_for(p);
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-int mspace_mallopt(int param_number, int value) {
|
|
|
- return change_mparam(param_number, value);
|
|
|
-}
|
|
|
-
|
|
|
-#endif /* MSPACES */
|
|
|
-
|
|
|
-
|
|
|
-/* -------------------- Alternative MORECORE functions ------------------- */
|
|
|
-
|
|
|
-/*
|
|
|
- Guidelines for creating a custom version of MORECORE:
|
|
|
-
|
|
|
- * For best performance, MORECORE should allocate in multiples of pagesize.
|
|
|
- * MORECORE may allocate more memory than requested. (Or even less,
|
|
|
- but this will usually result in a malloc failure.)
|
|
|
- * MORECORE must not allocate memory when given argument zero, but
|
|
|
- instead return one past the end address of memory from previous
|
|
|
- nonzero call.
|
|
|
- * For best performance, consecutive calls to MORECORE with positive
|
|
|
- arguments should return increasing addresses, indicating that
|
|
|
- space has been contiguously extended.
|
|
|
- * Even though consecutive calls to MORECORE need not return contiguous
|
|
|
- addresses, it must be OK for malloc'ed chunks to span multiple
|
|
|
- regions in those cases where they do happen to be contiguous.
|
|
|
- * MORECORE need not handle negative arguments -- it may instead
|
|
|
- just return MFAIL when given negative arguments.
|
|
|
- Negative arguments are always multiples of pagesize. MORECORE
|
|
|
- must not misinterpret negative args as large positive unsigned
|
|
|
- args. You can suppress all such calls from even occurring by defining
|
|
|
- MORECORE_CANNOT_TRIM,
|
|
|
-
|
|
|
- As an example alternative MORECORE, here is a custom allocator
|
|
|
- kindly contributed for pre-OSX macOS. It uses virtually but not
|
|
|
- necessarily physically contiguous non-paged memory (locked in,
|
|
|
- present and won't get swapped out). You can use it by uncommenting
|
|
|
- this section, adding some #includes, and setting up the appropriate
|
|
|
- defines above:
|
|
|
-
|
|
|
- #define MORECORE osMoreCore
|
|
|
-
|
|
|
- There is also a shutdown routine that should somehow be called for
|
|
|
- cleanup upon program exit.
|
|
|
-
|
|
|
- #define MAX_POOL_ENTRIES 100
|
|
|
- #define MINIMUM_MORECORE_SIZE (64 * 1024U)
|
|
|
- static int next_os_pool;
|
|
|
- void *our_os_pools[MAX_POOL_ENTRIES];
|
|
|
-
|
|
|
- void *osMoreCore(int size)
|
|
|
- {
|
|
|
- void *ptr = 0;
|
|
|
- static void *sbrk_top = 0;
|
|
|
-
|
|
|
- if (size > 0)
|
|
|
- {
|
|
|
- if (size < MINIMUM_MORECORE_SIZE)
|
|
|
- size = MINIMUM_MORECORE_SIZE;
|
|
|
- if (CurrentExecutionLevel() == kTaskLevel)
|
|
|
- ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0);
|
|
|
- if (ptr == 0)
|
|
|
- {
|
|
|
- return (void *) MFAIL;
|
|
|
- }
|
|
|
- // save ptrs so they can be freed during cleanup
|
|
|
- our_os_pools[next_os_pool] = ptr;
|
|
|
- next_os_pool++;
|
|
|
- ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK);
|
|
|
- sbrk_top = (char *) ptr + size;
|
|
|
- return ptr;
|
|
|
- }
|
|
|
- else if (size < 0)
|
|
|
- {
|
|
|
- // we don't currently support shrink behavior
|
|
|
- return (void *) MFAIL;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- return sbrk_top;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- // cleanup any allocated memory pools
|
|
|
- // called as last thing before shutting down driver
|
|
|
-
|
|
|
- void osCleanupMem(void)
|
|
|
- {
|
|
|
- void **ptr;
|
|
|
-
|
|
|
- for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++)
|
|
|
- if (*ptr)
|
|
|
- {
|
|
|
- PoolDeallocate(*ptr);
|
|
|
- *ptr = 0;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-*/
|
|
|
-
|
|
|
-
|
|
|
-/* -----------------------------------------------------------------------
|
|
|
-History:
|
|
|
- V2.8.4 Wed May 27 09:56:23 2009 Doug Lea (dl at gee)
|
|
|
- * Use zeros instead of prev foot for is_mmapped
|
|
|
- * Add mspace_track_large_chunks; thanks to Jean Brouwers
|
|
|
- * Fix set_inuse in internal_realloc; thanks to Jean Brouwers
|
|
|
- * Fix insufficient sys_alloc padding when using 16byte alignment
|
|
|
- * Fix bad error check in mspace_footprint
|
|
|
- * Adaptations for ptmalloc; thanks to Wolfram Gloger.
|
|
|
- * Reentrant spin locks; thanks to Earl Chew and others
|
|
|
- * Win32 improvements; thanks to Niall Douglas and Earl Chew
|
|
|
- * Add NO_SEGMENT_TRAVERSAL and MAX_RELEASE_CHECK_RATE options
|
|
|
- * Extension hook in malloc_state
|
|
|
- * Various small adjustments to reduce warnings on some compilers
|
|
|
- * Various configuration extensions/changes for more platforms. Thanks
|
|
|
- to all who contributed these.
|
|
|
-
|
|
|
- V2.8.3 Thu Sep 22 11:16:32 2005 Doug Lea (dl at gee)
|
|
|
- * Add max_footprint functions
|
|
|
- * Ensure all appropriate literals are size_t
|
|
|
- * Fix conditional compilation problem for some #define settings
|
|
|
- * Avoid concatenating segments with the one provided
|
|
|
- in create_mspace_with_base
|
|
|
- * Rename some variables to avoid compiler shadowing warnings
|
|
|
- * Use explicit lock initialization.
|
|
|
- * Better handling of sbrk interference.
|
|
|
- * Simplify and fix segment insertion, trimming and mspace_destroy
|
|
|
- * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x
|
|
|
- * Thanks especially to Dennis Flanagan for help on these.
|
|
|
-
|
|
|
- V2.8.2 Sun Jun 12 16:01:10 2005 Doug Lea (dl at gee)
|
|
|
- * Fix memalign brace error.
|
|
|
-
|
|
|
- V2.8.1 Wed Jun 8 16:11:46 2005 Doug Lea (dl at gee)
|
|
|
- * Fix improper #endif nesting in C++
|
|
|
- * Add explicit casts needed for C++
|
|
|
-
|
|
|
- V2.8.0 Mon May 30 14:09:02 2005 Doug Lea (dl at gee)
|
|
|
- * Use trees for large bins
|
|
|
- * Support mspaces
|
|
|
- * Use segments to unify sbrk-based and mmap-based system allocation,
|
|
|
- removing need for emulation on most platforms without sbrk.
|
|
|
- * Default safety checks
|
|
|
- * Optional footer checks. Thanks to William Robertson for the idea.
|
|
|
- * Internal code refactoring
|
|
|
- * Incorporate suggestions and platform-specific changes.
|
|
|
- Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas,
|
|
|
- Aaron Bachmann, Emery Berger, and others.
|
|
|
- * Speed up non-fastbin processing enough to remove fastbins.
|
|
|
- * Remove useless cfree() to avoid conflicts with other apps.
|
|
|
- * Remove internal memcpy, memset. Compilers handle builtins better.
|
|
|
- * Remove some options that no one ever used and rename others.
|
|
|
-
|
|
|
- V2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
|
|
|
- * Fix malloc_state bitmap array misdeclaration
|
|
|
-
|
|
|
- V2.7.1 Thu Jul 25 10:58:03 2002 Doug Lea (dl at gee)
|
|
|
- * Allow tuning of FIRST_SORTED_BIN_SIZE
|
|
|
- * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte.
|
|
|
- * Better detection and support for non-contiguousness of MORECORE.
|
|
|
- Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger
|
|
|
- * Bypass most of malloc if no frees. Thanks To Emery Berger.
|
|
|
- * Fix freeing of old top non-contiguous chunk im sysmalloc.
|
|
|
- * Raised default trim and map thresholds to 256K.
|
|
|
- * Fix mmap-related #defines. Thanks to Lubos Lunak.
|
|
|
- * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield.
|
|
|
- * Branch-free bin calculation
|
|
|
- * Default trim and mmap thresholds now 256K.
|
|
|
-
|
|
|
- V2.7.0 Sun Mar 11 14:14:06 2001 Doug Lea (dl at gee)
|
|
|
- * Introduce independent_comalloc and independent_calloc.
|
|
|
- Thanks to Michael Pachos for motivation and help.
|
|
|
- * Make optional .h file available
|
|
|
- * Allow > 2GB requests on 32bit systems.
|
|
|
- * new WIN32 sbrk, mmap, munmap, lock code from <[email protected]>.
|
|
|
- Thanks also to Andreas Mueller <a.mueller at paradatec.de>,
|
|
|
- and Anonymous.
|
|
|
- * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for
|
|
|
- helping test this.)
|
|
|
- * memalign: check alignment arg
|
|
|
- * realloc: don't try to shift chunks backwards, since this
|
|
|
- leads to more fragmentation in some programs and doesn't
|
|
|
- seem to help in any others.
|
|
|
- * Collect all cases in malloc requiring system memory into sysmalloc
|
|
|
- * Use mmap as backup to sbrk
|
|
|
- * Place all internal state in malloc_state
|
|
|
- * Introduce fastbins (although similar to 2.5.1)
|
|
|
- * Many minor tunings and cosmetic improvements
|
|
|
- * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK
|
|
|
- * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS
|
|
|
- Thanks to Tony E. Bennett <[email protected]> and others.
|
|
|
- * Include errno.h to support default failure action.
|
|
|
-
|
|
|
- V2.6.6 Sun Dec 5 07:42:19 1999 Doug Lea (dl at gee)
|
|
|
- * return null for negative arguments
|
|
|
- * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com>
|
|
|
- * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h'
|
|
|
- (e.g. WIN32 platforms)
|
|
|
- * Cleanup header file inclusion for WIN32 platforms
|
|
|
- * Cleanup code to avoid Microsoft Visual C++ compiler complaints
|
|
|
- * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing
|
|
|
- memory allocation routines
|
|
|
- * Set 'malloc_getpagesize' for WIN32 platforms (needs more work)
|
|
|
- * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to
|
|
|
- usage of 'assert' in non-WIN32 code
|
|
|
- * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to
|
|
|
- avoid infinite loop
|
|
|
- * Always call 'fREe()' rather than 'free()'
|
|
|
-
|
|
|
- V2.6.5 Wed Jun 17 15:57:31 1998 Doug Lea (dl at gee)
|
|
|
- * Fixed ordering problem with boundary-stamping
|
|
|
-
|
|
|
- V2.6.3 Sun May 19 08:17:58 1996 Doug Lea (dl at gee)
|
|
|
- * Added pvalloc, as recommended by H.J. Liu
|
|
|
- * Added 64bit pointer support mainly from Wolfram Gloger
|
|
|
- * Added anonymously donated WIN32 sbrk emulation
|
|
|
- * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen
|
|
|
- * malloc_extend_top: fix mask error that caused wastage after
|
|
|
- foreign sbrks
|
|
|
- * Add linux mremap support code from HJ Liu
|
|
|
-
|
|
|
- V2.6.2 Tue Dec 5 06:52:55 1995 Doug Lea (dl at gee)
|
|
|
- * Integrated most documentation with the code.
|
|
|
- * Add support for mmap, with help from
|
|
|
- Wolfram Gloger ([email protected]).
|
|
|
- * Use last_remainder in more cases.
|
|
|
- * Pack bins using idea from [email protected]
|
|
|
- * Use ordered bins instead of best-fit threshhold
|
|
|
- * Eliminate block-local decls to simplify tracing and debugging.
|
|
|
- * Support another case of realloc via move into top
|
|
|
- * Fix error occuring when initial sbrk_base not word-aligned.
|
|
|
- * Rely on page size for units instead of SBRK_UNIT to
|
|
|
- avoid surprises about sbrk alignment conventions.
|
|
|
- * Add mallinfo, mallopt. Thanks to Raymond Nijssen
|
|
|
- ([email protected]) for the suggestion.
|
|
|
- * Add `pad' argument to malloc_trim and top_pad mallopt parameter.
|
|
|
- * More precautions for cases where other routines call sbrk,
|
|
|
- courtesy of Wolfram Gloger ([email protected]).
|
|
|
- * Added macros etc., allowing use in linux libc from
|
|
|
- H.J. Lu ([email protected])
|
|
|
- * Inverted this history list
|
|
|
-
|
|
|
- V2.6.1 Sat Dec 2 14:10:57 1995 Doug Lea (dl at gee)
|
|
|
- * Re-tuned and fixed to behave more nicely with V2.6.0 changes.
|
|
|
- * Removed all preallocation code since under current scheme
|
|
|
- the work required to undo bad preallocations exceeds
|
|
|
- the work saved in good cases for most test programs.
|
|
|
- * No longer use return list or unconsolidated bins since
|
|
|
- no scheme using them consistently outperforms those that don't
|
|
|
- given above changes.
|
|
|
- * Use best fit for very large chunks to prevent some worst-cases.
|
|
|
- * Added some support for debugging
|
|
|
-
|
|
|
- V2.6.0 Sat Nov 4 07:05:23 1995 Doug Lea (dl at gee)
|
|
|
- * Removed footers when chunks are in use. Thanks to
|
|
|
- Paul Wilson ([email protected]) for the suggestion.
|
|
|
-
|
|
|
- V2.5.4 Wed Nov 1 07:54:51 1995 Doug Lea (dl at gee)
|
|
|
- * Added malloc_trim, with help from Wolfram Gloger
|
|
|
- ([email protected]).
|
|
|
-
|
|
|
- V2.5.3 Tue Apr 26 10:16:01 1994 Doug Lea (dl at g)
|
|
|
-
|
|
|
- V2.5.2 Tue Apr 5 16:20:40 1994 Doug Lea (dl at g)
|
|
|
- * realloc: try to expand in both directions
|
|
|
- * malloc: swap order of clean-bin strategy;
|
|
|
- * realloc: only conditionally expand backwards
|
|
|
- * Try not to scavenge used bins
|
|
|
- * Use bin counts as a guide to preallocation
|
|
|
- * Occasionally bin return list chunks in first scan
|
|
|
- * Add a few optimizations from [email protected]
|
|
|
-
|
|
|
- V2.5.1 Sat Aug 14 15:40:43 1993 Doug Lea (dl at g)
|
|
|
- * faster bin computation & slightly different binning
|
|
|
- * merged all consolidations to one part of malloc proper
|
|
|
- (eliminating old malloc_find_space & malloc_clean_bin)
|
|
|
- * Scan 2 returns chunks (not just 1)
|
|
|
- * Propagate failure in realloc if malloc returns 0
|
|
|
- * Add stuff to allow compilation on non-ANSI compilers
|
|
|
- from [email protected]
|
|
|
-
|
|
|
- V2.5 Sat Aug 7 07:41:59 1993 Doug Lea (dl at g.oswego.edu)
|
|
|
- * removed potential for odd address access in prev_chunk
|
|
|
- * removed dependency on getpagesize.h
|
|
|
- * misc cosmetics and a bit more internal documentation
|
|
|
- * anticosmetics: mangled names in macros to evade debugger strangeness
|
|
|
- * tested on sparc, hp-700, dec-mips, rs6000
|
|
|
- with gcc & native cc (hp, dec only) allowing
|
|
|
- Detlefs & Zorn comparison study (in SIGPLAN Notices.)
|
|
|
-
|
|
|
- Trial version Fri Aug 28 13:14:29 1992 Doug Lea (dl at g.oswego.edu)
|
|
|
- * Based loosely on libg++-1.2X malloc. (It retains some of the overall
|
|
|
- structure of old version, but most details differ.)
|
|
|
-
|
|
|
-*/
|
|
|
-
|
|
|
-#endif
|
|
|
+#ifdef NEDMALLOC_ENABLED
|
|
|
+/*
|
|
|
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
|
|
|
+ Doug Lea and released to the public domain, as explained at
|
|
|
+ http://creativecommons.org/licenses/publicdomain. Send questions,
|
|
|
+ comments, complaints, performance data, etc to [email protected]
|
|
|
+
|
|
|
+* Version 2.8.4 Wed May 27 09:56:23 2009 Doug Lea (dl at gee)
|
|
|
+
|
|
|
+ Note: There may be an updated version of this malloc obtainable at
|
|
|
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
|
|
|
+ Check before installing!
|
|
|
+
|
|
|
+* Quickstart
|
|
|
+
|
|
|
+ This library is all in one file to simplify the most common usage:
|
|
|
+ ftp it, compile it (-O3), and link it into another program. All of
|
|
|
+ the compile-time options default to reasonable values for use on
|
|
|
+ most platforms. You might later want to step through various
|
|
|
+ compile-time and dynamic tuning options.
|
|
|
+
|
|
|
+ For convenience, an include file for code using this malloc is at:
|
|
|
+ ftp://gee.cs.oswego.edu/pub/misc/malloc-2.8.4.h
|
|
|
+ You don't really need this .h file unless you call functions not
|
|
|
+ defined in your system include files. The .h file contains only the
|
|
|
+ excerpts from this file needed for using this malloc on ANSI C/C++
|
|
|
+ systems, so long as you haven't changed compile-time options about
|
|
|
+ naming and tuning parameters. If you do, then you can create your
|
|
|
+ own malloc.h that does include all settings by cutting at the point
|
|
|
+ indicated below. Note that you may already by default be using a C
|
|
|
+ library containing a malloc that is based on some version of this
|
|
|
+ malloc (for example in linux). You might still want to use the one
|
|
|
+ in this file to customize settings or to avoid overheads associated
|
|
|
+ with library versions.
|
|
|
+
|
|
|
+* Vital statistics:
|
|
|
+
|
|
|
+ Supported pointer/size_t representation: 4 or 8 bytes
|
|
|
+ size_t MUST be an unsigned type of the same width as
|
|
|
+ pointers. (If you are using an ancient system that declares
|
|
|
+ size_t as a signed type, or need it to be a different width
|
|
|
+ than pointers, you can use a previous release of this malloc
|
|
|
+ (e.g. 2.7.2) supporting these.)
|
|
|
+
|
|
|
+ Alignment: 8 bytes (default)
|
|
|
+ This suffices for nearly all current machines and C compilers.
|
|
|
+ However, you can define MALLOC_ALIGNMENT to be wider than this
|
|
|
+ if necessary (up to 128bytes), at the expense of using more space.
|
|
|
+
|
|
|
+ Minimum overhead per allocated chunk: 4 or 8 bytes (if 4byte sizes)
|
|
|
+ 8 or 16 bytes (if 8byte sizes)
|
|
|
+ Each malloced chunk has a hidden word of overhead holding size
|
|
|
+ and status information, and additional cross-check word
|
|
|
+ if FOOTERS is defined.
|
|
|
+
|
|
|
+ Minimum allocated size: 4-byte ptrs: 16 bytes (including overhead)
|
|
|
+ 8-byte ptrs: 32 bytes (including overhead)
|
|
|
+
|
|
|
+ Even a request for zero bytes (i.e., malloc(0)) returns a
|
|
|
+ pointer to something of the minimum allocatable size.
|
|
|
+ The maximum overhead wastage (i.e., number of extra bytes
|
|
|
+ allocated than were requested in malloc) is less than or equal
|
|
|
+ to the minimum size, except for requests >= mmap_threshold that
|
|
|
+ are serviced via mmap(), where the worst case wastage is about
|
|
|
+ 32 bytes plus the remainder from a system page (the minimal
|
|
|
+ mmap unit); typically 4096 or 8192 bytes.
|
|
|
+
|
|
|
+ Security: static-safe; optionally more or less
|
|
|
+ The "security" of malloc refers to the ability of malicious
|
|
|
+ code to accentuate the effects of errors (for example, freeing
|
|
|
+ space that is not currently malloc'ed or overwriting past the
|
|
|
+ ends of chunks) in code that calls malloc. This malloc
|
|
|
+ guarantees not to modify any memory locations below the base of
|
|
|
+ heap, i.e., static variables, even in the presence of usage
|
|
|
+ errors. The routines additionally detect most improper frees
|
|
|
+ and reallocs. All this holds as long as the static bookkeeping
|
|
|
+ for malloc itself is not corrupted by some other means. This
|
|
|
+ is only one aspect of security -- these checks do not, and
|
|
|
+ cannot, detect all possible programming errors.
|
|
|
+
|
|
|
+ If FOOTERS is defined nonzero, then each allocated chunk
|
|
|
+ carries an additional check word to verify that it was malloced
|
|
|
+ from its space. These check words are the same within each
|
|
|
+ execution of a program using malloc, but differ across
|
|
|
+ executions, so externally crafted fake chunks cannot be
|
|
|
+ freed. This improves security by rejecting frees/reallocs that
|
|
|
+ could corrupt heap memory, in addition to the checks preventing
|
|
|
+ writes to statics that are always on. This may further improve
|
|
|
+ security at the expense of time and space overhead. (Note that
|
|
|
+ FOOTERS may also be worth using with MSPACES.)
|
|
|
+
|
|
|
+ By default detected errors cause the program to abort (calling
|
|
|
+ "abort()"). You can override this to instead proceed past
|
|
|
+ errors by defining PROCEED_ON_ERROR. In this case, a bad free
|
|
|
+ has no effect, and a malloc that encounters a bad address
|
|
|
+ caused by user overwrites will ignore the bad address by
|
|
|
+ dropping pointers and indices to all known memory. This may
|
|
|
+ be appropriate for programs that should continue if at all
|
|
|
+ possible in the face of programming errors, although they may
|
|
|
+ run out of memory because dropped memory is never reclaimed.
|
|
|
+
|
|
|
+ If you don't like either of these options, you can define
|
|
|
+ CORRUPTION_ERROR_ACTION and USAGE_ERROR_ACTION to do anything
|
|
|
+ else. And if if you are sure that your program using malloc has
|
|
|
+ no errors or vulnerabilities, you can define INSECURE to 1,
|
|
|
+ which might (or might not) provide a small performance improvement.
|
|
|
+
|
|
|
+ Thread-safety: NOT thread-safe unless USE_LOCKS defined
|
|
|
+ When USE_LOCKS is defined, each public call to malloc, free,
|
|
|
+ etc is surrounded with either a pthread mutex or a win32
|
|
|
+ spinlock (depending on WIN32). This is not especially fast, and
|
|
|
+ can be a major bottleneck. It is designed only to provide
|
|
|
+ minimal protection in concurrent environments, and to provide a
|
|
|
+ basis for extensions. If you are using malloc in a concurrent
|
|
|
+ program, consider instead using nedmalloc
|
|
|
+ (http://www.nedprod.com/programs/portable/nedmalloc/) or
|
|
|
+ ptmalloc (See http://www.malloc.de), which are derived
|
|
|
+ from versions of this malloc.
|
|
|
+
|
|
|
+ System requirements: Any combination of MORECORE and/or MMAP/MUNMAP
|
|
|
+ This malloc can use unix sbrk or any emulation (invoked using
|
|
|
+ the CALL_MORECORE macro) and/or mmap/munmap or any emulation
|
|
|
+ (invoked using CALL_MMAP/CALL_MUNMAP) to get and release system
|
|
|
+ memory. On most unix systems, it tends to work best if both
|
|
|
+ MORECORE and MMAP are enabled. On Win32, it uses emulations
|
|
|
+ based on VirtualAlloc. It also uses common C library functions
|
|
|
+ like memset.
|
|
|
+
|
|
|
+ Compliance: I believe it is compliant with the Single Unix Specification
|
|
|
+ (See http://www.unix.org). Also SVID/XPG, ANSI C, and probably
|
|
|
+ others as well.
|
|
|
+
|
|
|
+* Overview of algorithms
|
|
|
+
|
|
|
+ This is not the fastest, most space-conserving, most portable, or
|
|
|
+ most tunable malloc ever written. However it is among the fastest
|
|
|
+ while also being among the most space-conserving, portable and
|
|
|
+ tunable. Consistent balance across these factors results in a good
|
|
|
+ general-purpose allocator for malloc-intensive programs.
|
|
|
+
|
|
|
+ In most ways, this malloc is a best-fit allocator. Generally, it
|
|
|
+ chooses the best-fitting existing chunk for a request, with ties
|
|
|
+ broken in approximately least-recently-used order. (This strategy
|
|
|
+ normally maintains low fragmentation.) However, for requests less
|
|
|
+ than 256bytes, it deviates from best-fit when there is not an
|
|
|
+ exactly fitting available chunk by preferring to use space adjacent
|
|
|
+ to that used for the previous small request, as well as by breaking
|
|
|
+ ties in approximately most-recently-used order. (These enhance
|
|
|
+ locality of series of small allocations.) And for very large requests
|
|
|
+ (>= 256Kb by default), it relies on system memory mapping
|
|
|
+ facilities, if supported. (This helps avoid carrying around and
|
|
|
+ possibly fragmenting memory used only for large chunks.)
|
|
|
+
|
|
|
+ All operations (except malloc_stats and mallinfo) have execution
|
|
|
+ times that are bounded by a constant factor of the number of bits in
|
|
|
+ a size_t, not counting any clearing in calloc or copying in realloc,
|
|
|
+ or actions surrounding MORECORE and MMAP that have times
|
|
|
+ proportional to the number of non-contiguous regions returned by
|
|
|
+ system allocation routines, which is often just 1. In real-time
|
|
|
+ applications, you can optionally suppress segment traversals using
|
|
|
+ NO_SEGMENT_TRAVERSAL, which assures bounded execution even when
|
|
|
+ system allocators return non-contiguous spaces, at the typical
|
|
|
+ expense of carrying around more memory and increased fragmentation.
|
|
|
+
|
|
|
+ The implementation is not very modular and seriously overuses
|
|
|
+ macros. Perhaps someday all C compilers will do as good a job
|
|
|
+ inlining modular code as can now be done by brute-force expansion,
|
|
|
+ but now, enough of them seem not to.
|
|
|
+
|
|
|
+ Some compilers issue a lot of warnings about code that is
|
|
|
+ dead/unreachable only on some platforms, and also about intentional
|
|
|
+ uses of negation on unsigned types. All known cases of each can be
|
|
|
+ ignored.
|
|
|
+
|
|
|
+ For a longer but out of date high-level description, see
|
|
|
+ http://gee.cs.oswego.edu/dl/html/malloc.html
|
|
|
+
|
|
|
+* MSPACES
|
|
|
+ If MSPACES is defined, then in addition to malloc, free, etc.,
|
|
|
+ this file also defines mspace_malloc, mspace_free, etc. These
|
|
|
+ are versions of malloc routines that take an "mspace" argument
|
|
|
+ obtained using create_mspace, to control all internal bookkeeping.
|
|
|
+ If ONLY_MSPACES is defined, only these versions are compiled.
|
|
|
+ So if you would like to use this allocator for only some allocations,
|
|
|
+ and your system malloc for others, you can compile with
|
|
|
+ ONLY_MSPACES and then do something like...
|
|
|
+ static mspace mymspace = create_mspace(0,0); // for example
|
|
|
+ #define mymalloc(bytes) mspace_malloc(mymspace, bytes)
|
|
|
+
|
|
|
+ (Note: If you only need one instance of an mspace, you can instead
|
|
|
+ use "USE_DL_PREFIX" to relabel the global malloc.)
|
|
|
+
|
|
|
+ You can similarly create thread-local allocators by storing
|
|
|
+ mspaces as thread-locals. For example:
|
|
|
+ static __thread mspace tlms = 0;
|
|
|
+ void* tlmalloc(size_t bytes) {
|
|
|
+ if (tlms == 0) tlms = create_mspace(0, 0);
|
|
|
+ return mspace_malloc(tlms, bytes);
|
|
|
+ }
|
|
|
+ void tlfree(void* mem) { mspace_free(tlms, mem); }
|
|
|
+
|
|
|
+ Unless FOOTERS is defined, each mspace is completely independent.
|
|
|
+ You cannot allocate from one and free to another (although
|
|
|
+ conformance is only weakly checked, so usage errors are not always
|
|
|
+ caught). If FOOTERS is defined, then each chunk carries around a tag
|
|
|
+ indicating its originating mspace, and frees are directed to their
|
|
|
+ originating spaces.
|
|
|
+
|
|
|
+ ------------------------- Compile-time options ---------------------------
|
|
|
+
|
|
|
+Be careful in setting #define values for numerical constants of type
|
|
|
+size_t. On some systems, literal values are not automatically extended
|
|
|
+to size_t precision unless they are explicitly casted. You can also
|
|
|
+use the symbolic values MAX_SIZE_T, SIZE_T_ONE, etc below.
|
|
|
+
|
|
|
+WIN32 default: defined if _WIN32 defined
|
|
|
+ Defining WIN32 sets up defaults for MS environment and compilers.
|
|
|
+ Otherwise defaults are for unix. Beware that there seem to be some
|
|
|
+ cases where this malloc might not be a pure drop-in replacement for
|
|
|
+ Win32 malloc: Random-looking failures from Win32 GDI API's (eg;
|
|
|
+ SetDIBits()) may be due to bugs in some video driver implementations
|
|
|
+ when pixel buffers are malloc()ed, and the region spans more than
|
|
|
+ one VirtualAlloc()ed region. Because dlmalloc uses a small (64Kb)
|
|
|
+ default granularity, pixel buffers may straddle virtual allocation
|
|
|
+ regions more often than when using the Microsoft allocator. You can
|
|
|
+ avoid this by using VirtualAlloc() and VirtualFree() for all pixel
|
|
|
+ buffers rather than using malloc(). If this is not possible,
|
|
|
+ recompile this malloc with a larger DEFAULT_GRANULARITY.
|
|
|
+
|
|
|
+MALLOC_ALIGNMENT default: (size_t)8
|
|
|
+ Controls the minimum alignment for malloc'ed chunks. It must be a
|
|
|
+ power of two and at least 8, even on machines for which smaller
|
|
|
+ alignments would suffice. It may be defined as larger than this
|
|
|
+ though. Note however that code and data structures are optimized for
|
|
|
+ the case of 8-byte alignment.
|
|
|
+
|
|
|
+MSPACES default: 0 (false)
|
|
|
+ If true, compile in support for independent allocation spaces.
|
|
|
+ This is only supported if HAVE_MMAP is true.
|
|
|
+
|
|
|
+ONLY_MSPACES default: 0 (false)
|
|
|
+ If true, only compile in mspace versions, not regular versions.
|
|
|
+
|
|
|
+USE_LOCKS default: 0 (false)
|
|
|
+ Causes each call to each public routine to be surrounded with
|
|
|
+ pthread or WIN32 mutex lock/unlock. (If set true, this can be
|
|
|
+ overridden on a per-mspace basis for mspace versions.) If set to a
|
|
|
+ non-zero value other than 1, locks are used, but their
|
|
|
+ implementation is left out, so lock functions must be supplied manually,
|
|
|
+ as described below.
|
|
|
+
|
|
|
+USE_SPIN_LOCKS default: 1 iff USE_LOCKS and on x86 using gcc or MSC
|
|
|
+ If true, uses custom spin locks for locking. This is currently
|
|
|
+ supported only for x86 platforms using gcc or recent MS compilers.
|
|
|
+ Otherwise, posix locks or win32 critical sections are used.
|
|
|
+
|
|
|
+FOOTERS default: 0
|
|
|
+ If true, provide extra checking and dispatching by placing
|
|
|
+ information in the footers of allocated chunks. This adds
|
|
|
+ space and time overhead.
|
|
|
+
|
|
|
+INSECURE default: 0
|
|
|
+ If true, omit checks for usage errors and heap space overwrites.
|
|
|
+
|
|
|
+USE_DL_PREFIX default: NOT defined
|
|
|
+ Causes compiler to prefix all public routines with the string 'dl'.
|
|
|
+ This can be useful when you only want to use this malloc in one part
|
|
|
+ of a program, using your regular system malloc elsewhere.
|
|
|
+
|
|
|
+ABORT default: defined as abort()
|
|
|
+ Defines how to abort on failed checks. On most systems, a failed
|
|
|
+ check cannot die with an "assert" or even print an informative
|
|
|
+ message, because the underlying print routines in turn call malloc,
|
|
|
+ which will fail again. Generally, the best policy is to simply call
|
|
|
+ abort(). It's not very useful to do more than this because many
|
|
|
+ errors due to overwriting will show up as address faults (null, odd
|
|
|
+ addresses etc) rather than malloc-triggered checks, so will also
|
|
|
+ abort. Also, most compilers know that abort() does not return, so
|
|
|
+ can better optimize code conditionally calling it.
|
|
|
+
|
|
|
+PROCEED_ON_ERROR default: defined as 0 (false)
|
|
|
+ Controls whether detected bad addresses cause them to bypassed
|
|
|
+ rather than aborting. If set, detected bad arguments to free and
|
|
|
+ realloc are ignored. And all bookkeeping information is zeroed out
|
|
|
+ upon a detected overwrite of freed heap space, thus losing the
|
|
|
+ ability to ever return it from malloc again, but enabling the
|
|
|
+ application to proceed. If PROCEED_ON_ERROR is defined, the
|
|
|
+ static variable malloc_corruption_error_count is compiled in
|
|
|
+ and can be examined to see if errors have occurred. This option
|
|
|
+ generates slower code than the default abort policy.
|
|
|
+
|
|
|
+DEBUG default: NOT defined
|
|
|
+ The DEBUG setting is mainly intended for people trying to modify
|
|
|
+ this code or diagnose problems when porting to new platforms.
|
|
|
+ However, it may also be able to better isolate user errors than just
|
|
|
+ using runtime checks. The assertions in the check routines spell
|
|
|
+ out in more detail the assumptions and invariants underlying the
|
|
|
+ algorithms. The checking is fairly extensive, and will slow down
|
|
|
+ execution noticeably. Calling malloc_stats or mallinfo with DEBUG
|
|
|
+ set will attempt to check every non-mmapped allocated and free chunk
|
|
|
+ in the course of computing the summaries.
|
|
|
+
|
|
|
+ABORT_ON_ASSERT_FAILURE default: defined as 1 (true)
|
|
|
+ Debugging assertion failures can be nearly impossible if your
|
|
|
+ version of the assert macro causes malloc to be called, which will
|
|
|
+ lead to a cascade of further failures, blowing the runtime stack.
|
|
|
+ ABORT_ON_ASSERT_FAILURE cause assertions failures to call abort(),
|
|
|
+ which will usually make debugging easier.
|
|
|
+
|
|
|
+MALLOC_FAILURE_ACTION default: sets errno to ENOMEM, or no-op on win32
|
|
|
+ The action to take before "return 0" when malloc fails to be able to
|
|
|
+ return memory because there is none available.
|
|
|
+
|
|
|
+HAVE_MORECORE default: 1 (true) unless win32 or ONLY_MSPACES
|
|
|
+ True if this system supports sbrk or an emulation of it.
|
|
|
+
|
|
|
+MORECORE default: sbrk
|
|
|
+ The name of the sbrk-style system routine to call to obtain more
|
|
|
+ memory. See below for guidance on writing custom MORECORE
|
|
|
+ functions. The type of the argument to sbrk/MORECORE varies across
|
|
|
+ systems. It cannot be size_t, because it supports negative
|
|
|
+ arguments, so it is normally the signed type of the same width as
|
|
|
+ size_t (sometimes declared as "intptr_t"). It doesn't much matter
|
|
|
+ though. Internally, we only call it with arguments less than half
|
|
|
+ the max value of a size_t, which should work across all reasonable
|
|
|
+ possibilities, although sometimes generating compiler warnings.
|
|
|
+
|
|
|
+MORECORE_CONTIGUOUS default: 1 (true) if HAVE_MORECORE
|
|
|
+ If true, take advantage of fact that consecutive calls to MORECORE
|
|
|
+ with positive arguments always return contiguous increasing
|
|
|
+ addresses. This is true of unix sbrk. It does not hurt too much to
|
|
|
+ set it true anyway, since malloc copes with non-contiguities.
|
|
|
+ Setting it false when definitely non-contiguous saves time
|
|
|
+ and possibly wasted space it would take to discover this though.
|
|
|
+
|
|
|
+MORECORE_CANNOT_TRIM default: NOT defined
|
|
|
+ True if MORECORE cannot release space back to the system when given
|
|
|
+ negative arguments. This is generally necessary only if you are
|
|
|
+ using a hand-crafted MORECORE function that cannot handle negative
|
|
|
+ arguments.
|
|
|
+
|
|
|
+NO_SEGMENT_TRAVERSAL default: 0
|
|
|
+ If non-zero, suppresses traversals of memory segments
|
|
|
+ returned by either MORECORE or CALL_MMAP. This disables
|
|
|
+ merging of segments that are contiguous, and selectively
|
|
|
+ releasing them to the OS if unused, but bounds execution times.
|
|
|
+
|
|
|
+HAVE_MMAP default: 1 (true)
|
|
|
+ True if this system supports mmap or an emulation of it. If so, and
|
|
|
+ HAVE_MORECORE is not true, MMAP is used for all system
|
|
|
+ allocation. If set and HAVE_MORECORE is true as well, MMAP is
|
|
|
+ primarily used to directly allocate very large blocks. It is also
|
|
|
+ used as a backup strategy in cases where MORECORE fails to provide
|
|
|
+ space from system. Note: A single call to MUNMAP is assumed to be
|
|
|
+ able to unmap memory that may have be allocated using multiple calls
|
|
|
+ to MMAP, so long as they are adjacent.
|
|
|
+
|
|
|
+HAVE_MREMAP default: 1 on linux, else 0
|
|
|
+ If true realloc() uses mremap() to re-allocate large blocks and
|
|
|
+ extend or shrink allocation spaces.
|
|
|
+
|
|
|
+MMAP_CLEARS default: 1 except on WINCE.
|
|
|
+ True if mmap clears memory so calloc doesn't need to. This is true
|
|
|
+ for standard unix mmap using /dev/zero and on WIN32 except for WINCE.
|
|
|
+
|
|
|
+USE_BUILTIN_FFS default: 0 (i.e., not used)
|
|
|
+ Causes malloc to use the builtin ffs() function to compute indices.
|
|
|
+ Some compilers may recognize and intrinsify ffs to be faster than the
|
|
|
+ supplied C version. Also, the case of x86 using gcc is special-cased
|
|
|
+ to an asm instruction, so is already as fast as it can be, and so
|
|
|
+ this setting has no effect. Similarly for Win32 under recent MS compilers.
|
|
|
+ (On most x86s, the asm version is only slightly faster than the C version.)
|
|
|
+
|
|
|
+malloc_getpagesize default: derive from system includes, or 4096.
|
|
|
+ The system page size. To the extent possible, this malloc manages
|
|
|
+ memory from the system in page-size units. This may be (and
|
|
|
+ usually is) a function rather than a constant. This is ignored
|
|
|
+ if WIN32, where page size is determined using getSystemInfo during
|
|
|
+ initialization. This may be several megabytes if ENABLE_LARGE_PAGES
|
|
|
+ is enabled.
|
|
|
+
|
|
|
+ENABLE_LARGE_PAGES default: NOT defined
|
|
|
+ Causes the system page size to be the value of GetLargePageMinimum()
|
|
|
+ if that function is available (Windows Server 2003/Vista or later).
|
|
|
+ This allows the use of large page entries in the MMU which can
|
|
|
+ significantly improve performance in large working set applications
|
|
|
+ as TLB cache load is reduced by a factor of three. Note that enabling
|
|
|
+ this option is equal to locking the process' memory in current
|
|
|
+ implementations of Windows and requires the SE_LOCK_MEMORY_PRIVILEGE
|
|
|
+ to be held by the process in order to succeed.
|
|
|
+
|
|
|
+USE_DEV_RANDOM default: 0 (i.e., not used)
|
|
|
+ Causes malloc to use /dev/random to initialize secure magic seed for
|
|
|
+ stamping footers. Otherwise, the current time is used.
|
|
|
+
|
|
|
+NO_MALLINFO default: 0
|
|
|
+ If defined, don't compile "mallinfo". This can be a simple way
|
|
|
+ of dealing with mismatches between system declarations and
|
|
|
+ those in this file.
|
|
|
+
|
|
|
+MALLINFO_FIELD_TYPE default: size_t
|
|
|
+ The type of the fields in the mallinfo struct. This was originally
|
|
|
+ defined as "int" in SVID etc, but is more usefully defined as
|
|
|
+ size_t. The value is used only if HAVE_USR_INCLUDE_MALLOC_H is not set
|
|
|
+
|
|
|
+REALLOC_ZERO_BYTES_FREES default: not defined
|
|
|
+ This should be set if a call to realloc with zero bytes should
|
|
|
+ be the same as a call to free. Some people think it should. Otherwise,
|
|
|
+ since this malloc returns a unique pointer for malloc(0), so does
|
|
|
+ realloc(p, 0).
|
|
|
+
|
|
|
+LACKS_UNISTD_H, LACKS_FCNTL_H, LACKS_SYS_PARAM_H, LACKS_SYS_MMAN_H
|
|
|
+LACKS_STRINGS_H, LACKS_STRING_H, LACKS_SYS_TYPES_H, LACKS_ERRNO_H
|
|
|
+LACKS_STDLIB_H default: NOT defined unless on WIN32
|
|
|
+ Define these if your system does not have these header files.
|
|
|
+ You might need to manually insert some of the declarations they provide.
|
|
|
+
|
|
|
+DEFAULT_GRANULARITY default: page size if MORECORE_CONTIGUOUS,
|
|
|
+ system_info.dwAllocationGranularity in WIN32,
|
|
|
+ GetLargePageMinimum() if ENABLE_LARGE_PAGES,
|
|
|
+ otherwise 64K.
|
|
|
+ Also settable using mallopt(M_GRANULARITY, x)
|
|
|
+ The unit for allocating and deallocating memory from the system. On
|
|
|
+ most systems with contiguous MORECORE, there is no reason to
|
|
|
+ make this more than a page. However, systems with MMAP tend to
|
|
|
+ either require or encourage larger granularities. You can increase
|
|
|
+ this value to prevent system allocation functions to be called so
|
|
|
+ often, especially if they are slow. The value must be at least one
|
|
|
+ page and must be a power of two. Setting to 0 causes initialization
|
|
|
+ to either page size or win32 region size. (Note: In previous
|
|
|
+ versions of malloc, the equivalent of this option was called
|
|
|
+ "TOP_PAD")
|
|
|
+
|
|
|
+DEFAULT_GRANULARITY_ALIGNED default: undefined (which means page size)
|
|
|
+ Whether to enforce alignment when allocating and deallocating memory
|
|
|
+ from the system i.e. the base address of all allocations will be
|
|
|
+ aligned to DEFAULT_GRANULARITY if it is set. Note that enabling this carries
|
|
|
+ some overhead as multiple calls must now be made when probing for a valid
|
|
|
+ aligned value, however it does greatly ease the checking for whether
|
|
|
+ a given memory pointer was allocated by this allocator rather than
|
|
|
+ some other.
|
|
|
+
|
|
|
+DEFAULT_TRIM_THRESHOLD default: 2MB
|
|
|
+ Also settable using mallopt(M_TRIM_THRESHOLD, x)
|
|
|
+ The maximum amount of unused top-most memory to keep before
|
|
|
+ releasing via malloc_trim in free(). Automatic trimming is mainly
|
|
|
+ useful in long-lived programs using contiguous MORECORE. Because
|
|
|
+ trimming via sbrk can be slow on some systems, and can sometimes be
|
|
|
+ wasteful (in cases where programs immediately afterward allocate
|
|
|
+ more large chunks) the value should be high enough so that your
|
|
|
+ overall system performance would improve by releasing this much
|
|
|
+ memory. As a rough guide, you might set to a value close to the
|
|
|
+ average size of a process (program) running on your system.
|
|
|
+ Releasing this much memory would allow such a process to run in
|
|
|
+ memory. Generally, it is worth tuning trim thresholds when a
|
|
|
+ program undergoes phases where several large chunks are allocated
|
|
|
+ and released in ways that can reuse each other's storage, perhaps
|
|
|
+ mixed with phases where there are no such chunks at all. The trim
|
|
|
+ value must be greater than page size to have any useful effect. To
|
|
|
+ disable trimming completely, you can set to MAX_SIZE_T. Note that the trick
|
|
|
+ some people use of mallocing a huge space and then freeing it at
|
|
|
+ program startup, in an attempt to reserve system memory, doesn't
|
|
|
+ have the intended effect under automatic trimming, since that memory
|
|
|
+ will immediately be returned to the system.
|
|
|
+
|
|
|
+DEFAULT_MMAP_THRESHOLD default: 256K
|
|
|
+ Also settable using mallopt(M_MMAP_THRESHOLD, x)
|
|
|
+ The request size threshold for using MMAP to directly service a
|
|
|
+ request. Requests of at least this size that cannot be allocated
|
|
|
+ using already-existing space will be serviced via mmap. (If enough
|
|
|
+ normal freed space already exists it is used instead.) Using mmap
|
|
|
+ segregates relatively large chunks of memory so that they can be
|
|
|
+ individually obtained and released from the host system. A request
|
|
|
+ serviced through mmap is never reused by any other request (at least
|
|
|
+ not directly; the system may just so happen to remap successive
|
|
|
+ requests to the same locations). Segregating space in this way has
|
|
|
+ the benefits that: Mmapped space can always be individually released
|
|
|
+ back to the system, which helps keep the system level memory demands
|
|
|
+ of a long-lived program low. Also, mapped memory doesn't become
|
|
|
+ `locked' between other chunks, as can happen with normally allocated
|
|
|
+ chunks, which means that even trimming via malloc_trim would not
|
|
|
+ release them. However, it has the disadvantage that the space
|
|
|
+ cannot be reclaimed, consolidated, and then used to service later
|
|
|
+ requests, as happens with normal chunks. The advantages of mmap
|
|
|
+ nearly always outweigh disadvantages for "large" chunks, but the
|
|
|
+ value of "large" may vary across systems. The default is an
|
|
|
+ empirically derived value that works well in most systems. You can
|
|
|
+ disable mmap by setting to MAX_SIZE_T.
|
|
|
+
|
|
|
+MAX_RELEASE_CHECK_RATE default: 4095 unless not HAVE_MMAP
|
|
|
+ The number of consolidated frees between checks to release
|
|
|
+ unused segments when freeing. When using non-contiguous segments,
|
|
|
+ especially with multiple mspaces, checking only for topmost space
|
|
|
+ doesn't always suffice to trigger trimming. To compensate for this,
|
|
|
+ free() will, with a period of MAX_RELEASE_CHECK_RATE (or the
|
|
|
+ current number of segments, if greater) try to release unused
|
|
|
+ segments to the OS when freeing chunks that result in
|
|
|
+ consolidation. The best value for this parameter is a compromise
|
|
|
+ between slowing down frees with relatively costly checks that
|
|
|
+ rarely trigger versus holding on to unused memory. To effectively
|
|
|
+ disable, set to MAX_SIZE_T. This may lead to a very slight speed
|
|
|
+ improvement at the expense of carrying around more memory.
|
|
|
+*/
|
|
|
+
|
|
|
+/* Version identifier to allow people to support multiple versions */
|
|
|
+#ifndef DLMALLOC_VERSION
|
|
|
+#define DLMALLOC_VERSION 20804
|
|
|
+#endif /* DLMALLOC_VERSION */
|
|
|
+
|
|
|
+#ifndef WIN32
|
|
|
+#ifdef _WIN32
|
|
|
+#define WIN32 1
|
|
|
+#endif /* _WIN32 */
|
|
|
+#ifdef _WIN32_WCE
|
|
|
+#define LACKS_FCNTL_H
|
|
|
+#define WIN32 1
|
|
|
+#endif /* _WIN32_WCE */
|
|
|
+#endif /* WIN32 */
|
|
|
+#ifdef WIN32
|
|
|
+#define WIN32_LEAN_AND_MEAN
|
|
|
+#include <windows.h>
|
|
|
+#include <tchar.h>
|
|
|
+#define HAVE_MMAP 1
|
|
|
+#define HAVE_MORECORE 0
|
|
|
+#define LACKS_UNISTD_H
|
|
|
+#define LACKS_SYS_PARAM_H
|
|
|
+#define LACKS_SYS_MMAN_H
|
|
|
+#define LACKS_STRING_H
|
|
|
+#define LACKS_STRINGS_H
|
|
|
+#define LACKS_SYS_TYPES_H
|
|
|
+#define LACKS_ERRNO_H
|
|
|
+#ifndef MALLOC_FAILURE_ACTION
|
|
|
+#define MALLOC_FAILURE_ACTION
|
|
|
+#endif /* MALLOC_FAILURE_ACTION */
|
|
|
+#ifdef _WIN32_WCE /* WINCE reportedly does not clear */
|
|
|
+#define MMAP_CLEARS 0
|
|
|
+#else
|
|
|
+#define MMAP_CLEARS 1
|
|
|
+#endif /* _WIN32_WCE */
|
|
|
+#endif /* WIN32 */
|
|
|
+
|
|
|
+#if defined(DARWIN) || defined(_DARWIN)
|
|
|
+/* Mac OSX docs advise not to use sbrk; it seems better to use mmap */
|
|
|
+#ifndef HAVE_MORECORE
|
|
|
+#define HAVE_MORECORE 0
|
|
|
+#define HAVE_MMAP 1
|
|
|
+/* OSX allocators provide 16 byte alignment */
|
|
|
+#ifndef MALLOC_ALIGNMENT
|
|
|
+#define MALLOC_ALIGNMENT ((size_t)16U)
|
|
|
+#endif
|
|
|
+#endif /* HAVE_MORECORE */
|
|
|
+#endif /* DARWIN */
|
|
|
+
|
|
|
+#ifndef LACKS_SYS_TYPES_H
|
|
|
+#include <sys/types.h> /* For size_t */
|
|
|
+#endif /* LACKS_SYS_TYPES_H */
|
|
|
+
|
|
|
+#if (defined(__GNUC__) && ((defined(__i386__) || defined(__x86_64__)))) || (defined(_MSC_VER) && _MSC_VER>=1310)
|
|
|
+#define SPIN_LOCKS_AVAILABLE 1
|
|
|
+#else
|
|
|
+#define SPIN_LOCKS_AVAILABLE 0
|
|
|
+#endif
|
|
|
+
|
|
|
+/* The maximum possible size_t value has all bits set */
|
|
|
+#define MAX_SIZE_T (~(size_t)0)
|
|
|
+
|
|
|
+#ifndef ONLY_MSPACES
|
|
|
+#define ONLY_MSPACES 0 /* define to a value */
|
|
|
+#else
|
|
|
+#define ONLY_MSPACES 1
|
|
|
+#endif /* ONLY_MSPACES */
|
|
|
+#ifndef MSPACES
|
|
|
+#if ONLY_MSPACES
|
|
|
+#define MSPACES 1
|
|
|
+#else /* ONLY_MSPACES */
|
|
|
+#define MSPACES 0
|
|
|
+#endif /* ONLY_MSPACES */
|
|
|
+#endif /* MSPACES */
|
|
|
+#ifndef MALLOC_ALIGNMENT
|
|
|
+#define MALLOC_ALIGNMENT ((size_t)8U)
|
|
|
+#endif /* MALLOC_ALIGNMENT */
|
|
|
+#ifndef FOOTERS
|
|
|
+#define FOOTERS 0
|
|
|
+#endif /* FOOTERS */
|
|
|
+#ifndef ABORT
|
|
|
+#define ABORT abort()
|
|
|
+#endif /* ABORT */
|
|
|
+#ifndef ABORT_ON_ASSERT_FAILURE
|
|
|
+#define ABORT_ON_ASSERT_FAILURE 1
|
|
|
+#endif /* ABORT_ON_ASSERT_FAILURE */
|
|
|
+#ifndef PROCEED_ON_ERROR
|
|
|
+#define PROCEED_ON_ERROR 0
|
|
|
+#endif /* PROCEED_ON_ERROR */
|
|
|
+#ifndef USE_LOCKS
|
|
|
+#define USE_LOCKS 0
|
|
|
+#endif /* USE_LOCKS */
|
|
|
+#ifndef USE_SPIN_LOCKS
|
|
|
+#if USE_LOCKS && SPIN_LOCKS_AVAILABLE
|
|
|
+#define USE_SPIN_LOCKS 1
|
|
|
+#else
|
|
|
+#define USE_SPIN_LOCKS 0
|
|
|
+#endif /* USE_LOCKS && SPIN_LOCKS_AVAILABLE. */
|
|
|
+#endif /* USE_SPIN_LOCKS */
|
|
|
+#ifndef INSECURE
|
|
|
+#define INSECURE 0
|
|
|
+#endif /* INSECURE */
|
|
|
+#ifndef HAVE_MMAP
|
|
|
+#define HAVE_MMAP 1
|
|
|
+#endif /* HAVE_MMAP */
|
|
|
+#ifndef MMAP_CLEARS
|
|
|
+#define MMAP_CLEARS 1
|
|
|
+#endif /* MMAP_CLEARS */
|
|
|
+#ifndef HAVE_MREMAP
|
|
|
+#ifdef linux
|
|
|
+#define HAVE_MREMAP 1
|
|
|
+#else /* linux */
|
|
|
+#define HAVE_MREMAP 0
|
|
|
+#endif /* linux */
|
|
|
+#endif /* HAVE_MREMAP */
|
|
|
+#ifndef MALLOC_FAILURE_ACTION
|
|
|
+#define MALLOC_FAILURE_ACTION errno = ENOMEM;
|
|
|
+#endif /* MALLOC_FAILURE_ACTION */
|
|
|
+#ifndef HAVE_MORECORE
|
|
|
+#if ONLY_MSPACES
|
|
|
+#define HAVE_MORECORE 0
|
|
|
+#else /* ONLY_MSPACES */
|
|
|
+#define HAVE_MORECORE 1
|
|
|
+#endif /* ONLY_MSPACES */
|
|
|
+#endif /* HAVE_MORECORE */
|
|
|
+#if !HAVE_MORECORE
|
|
|
+#define MORECORE_CONTIGUOUS 0
|
|
|
+#else /* !HAVE_MORECORE */
|
|
|
+#define MORECORE_DEFAULT sbrk
|
|
|
+#ifndef MORECORE_CONTIGUOUS
|
|
|
+#define MORECORE_CONTIGUOUS 1
|
|
|
+#endif /* MORECORE_CONTIGUOUS */
|
|
|
+#endif /* HAVE_MORECORE */
|
|
|
+#ifndef DEFAULT_GRANULARITY
|
|
|
+#if (MORECORE_CONTIGUOUS || defined(WIN32))
|
|
|
+#define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */
|
|
|
+#else /* MORECORE_CONTIGUOUS */
|
|
|
+#define DEFAULT_GRANULARITY ((size_t)64U * (size_t)1024U)
|
|
|
+#endif /* MORECORE_CONTIGUOUS */
|
|
|
+#endif /* DEFAULT_GRANULARITY */
|
|
|
+#ifndef DEFAULT_TRIM_THRESHOLD
|
|
|
+#ifndef MORECORE_CANNOT_TRIM
|
|
|
+#define DEFAULT_TRIM_THRESHOLD ((size_t)2U * (size_t)1024U * (size_t)1024U)
|
|
|
+#else /* MORECORE_CANNOT_TRIM */
|
|
|
+#define DEFAULT_TRIM_THRESHOLD MAX_SIZE_T
|
|
|
+#endif /* MORECORE_CANNOT_TRIM */
|
|
|
+#endif /* DEFAULT_TRIM_THRESHOLD */
|
|
|
+#ifndef DEFAULT_MMAP_THRESHOLD
|
|
|
+#if HAVE_MMAP
|
|
|
+#define DEFAULT_MMAP_THRESHOLD ((size_t)256U * (size_t)1024U)
|
|
|
+#else /* HAVE_MMAP */
|
|
|
+#define DEFAULT_MMAP_THRESHOLD MAX_SIZE_T
|
|
|
+#endif /* HAVE_MMAP */
|
|
|
+#endif /* DEFAULT_MMAP_THRESHOLD */
|
|
|
+#ifndef MAX_RELEASE_CHECK_RATE
|
|
|
+#if HAVE_MMAP
|
|
|
+#define MAX_RELEASE_CHECK_RATE 4095
|
|
|
+#else
|
|
|
+#define MAX_RELEASE_CHECK_RATE MAX_SIZE_T
|
|
|
+#endif /* HAVE_MMAP */
|
|
|
+#endif /* MAX_RELEASE_CHECK_RATE */
|
|
|
+#ifndef USE_BUILTIN_FFS
|
|
|
+#define USE_BUILTIN_FFS 0
|
|
|
+#endif /* USE_BUILTIN_FFS */
|
|
|
+#ifndef USE_DEV_RANDOM
|
|
|
+#define USE_DEV_RANDOM 0
|
|
|
+#endif /* USE_DEV_RANDOM */
|
|
|
+#ifndef NO_MALLINFO
|
|
|
+#define NO_MALLINFO 0
|
|
|
+#endif /* NO_MALLINFO */
|
|
|
+#ifndef MALLINFO_FIELD_TYPE
|
|
|
+#define MALLINFO_FIELD_TYPE size_t
|
|
|
+#endif /* MALLINFO_FIELD_TYPE */
|
|
|
+#ifndef NO_SEGMENT_TRAVERSAL
|
|
|
+#define NO_SEGMENT_TRAVERSAL 0
|
|
|
+#endif /* NO_SEGMENT_TRAVERSAL */
|
|
|
+
|
|
|
+/*
|
|
|
+ mallopt tuning options. SVID/XPG defines four standard parameter
|
|
|
+ numbers for mallopt, normally defined in malloc.h. None of these
|
|
|
+ are used in this malloc, so setting them has no effect. But this
|
|
|
+ malloc does support the following options.
|
|
|
+*/
|
|
|
+
|
|
|
+#define M_TRIM_THRESHOLD (-1)
|
|
|
+#define M_GRANULARITY (-2)
|
|
|
+#define M_MMAP_THRESHOLD (-3)
|
|
|
+
|
|
|
+/* ------------------------ Mallinfo declarations ------------------------ */
|
|
|
+
|
|
|
+#if !NO_MALLINFO
|
|
|
+/*
|
|
|
+ This version of malloc supports the standard SVID/XPG mallinfo
|
|
|
+ routine that returns a struct containing usage properties and
|
|
|
+ statistics. It should work on any system that has a
|
|
|
+ /usr/include/malloc.h defining struct mallinfo. The main
|
|
|
+ declaration needed is the mallinfo struct that is returned (by-copy)
|
|
|
+ by mallinfo(). The malloinfo struct contains a bunch of fields that
|
|
|
+ are not even meaningful in this version of malloc. These fields are
|
|
|
+ are instead filled by mallinfo() with other numbers that might be of
|
|
|
+ interest.
|
|
|
+
|
|
|
+ HAVE_USR_INCLUDE_MALLOC_H should be set if you have a
|
|
|
+ /usr/include/malloc.h file that includes a declaration of struct
|
|
|
+ mallinfo. If so, it is included; else a compliant version is
|
|
|
+ declared below. These must be precisely the same for mallinfo() to
|
|
|
+ work. The original SVID version of this struct, defined on most
|
|
|
+ systems with mallinfo, declares all fields as ints. But some others
|
|
|
+ define as unsigned long. If your system defines the fields using a
|
|
|
+ type of different width than listed here, you MUST #include your
|
|
|
+ system version and #define HAVE_USR_INCLUDE_MALLOC_H.
|
|
|
+*/
|
|
|
+
|
|
|
+/* #define HAVE_USR_INCLUDE_MALLOC_H */
|
|
|
+
|
|
|
+#ifdef HAVE_USR_INCLUDE_MALLOC_H
|
|
|
+#include "/usr/include/malloc.h"
|
|
|
+#else /* HAVE_USR_INCLUDE_MALLOC_H */
|
|
|
+#ifndef STRUCT_MALLINFO_DECLARED
|
|
|
+#define STRUCT_MALLINFO_DECLARED 1
|
|
|
+struct mallinfo {
|
|
|
+ MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
|
|
|
+ MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
|
|
|
+ MALLINFO_FIELD_TYPE smblks; /* always 0 */
|
|
|
+ MALLINFO_FIELD_TYPE hblks; /* always 0 */
|
|
|
+ MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
|
|
|
+ MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
|
|
|
+ MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
|
|
|
+ MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
|
|
|
+ MALLINFO_FIELD_TYPE fordblks; /* total free space */
|
|
|
+ MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
|
|
|
+};
|
|
|
+#endif /* STRUCT_MALLINFO_DECLARED */
|
|
|
+#endif /* HAVE_USR_INCLUDE_MALLOC_H */
|
|
|
+#endif /* NO_MALLINFO */
|
|
|
+
|
|
|
+/*
|
|
|
+ Try to persuade compilers to inline. The most critical functions for
|
|
|
+ inlining are defined as macros, so these aren't used for them.
|
|
|
+*/
|
|
|
+
|
|
|
+#ifndef FORCEINLINE
|
|
|
+ #if defined(__GNUC__)
|
|
|
+#define FORCEINLINE __inline __attribute__ ((always_inline))
|
|
|
+ #elif defined(_MSC_VER)
|
|
|
+ #define FORCEINLINE __forceinline
|
|
|
+ #endif
|
|
|
+#endif
|
|
|
+#ifndef NOINLINE
|
|
|
+ #if defined(__GNUC__)
|
|
|
+ #define NOINLINE __attribute__ ((noinline))
|
|
|
+ #elif defined(_MSC_VER)
|
|
|
+ #define NOINLINE __declspec(noinline)
|
|
|
+ #else
|
|
|
+ #define NOINLINE
|
|
|
+ #endif
|
|
|
+#endif
|
|
|
+
|
|
|
+#ifdef __cplusplus
|
|
|
+extern "C" {
|
|
|
+#ifndef FORCEINLINE
|
|
|
+ #define FORCEINLINE inline
|
|
|
+#endif
|
|
|
+#endif /* __cplusplus */
|
|
|
+#ifndef FORCEINLINE
|
|
|
+ #define FORCEINLINE
|
|
|
+#endif
|
|
|
+
|
|
|
+#if !ONLY_MSPACES
|
|
|
+
|
|
|
+/* ------------------- Declarations of public routines ------------------- */
|
|
|
+
|
|
|
+#ifndef USE_DL_PREFIX
|
|
|
+#define dlcalloc calloc
|
|
|
+#define dlfree free
|
|
|
+#define dlmalloc malloc
|
|
|
+#define dlmemalign memalign
|
|
|
+#define dlrealloc realloc
|
|
|
+#define dlvalloc valloc
|
|
|
+#define dlpvalloc pvalloc
|
|
|
+#define dlmallinfo mallinfo
|
|
|
+#define dlmallopt mallopt
|
|
|
+#define dlmalloc_trim malloc_trim
|
|
|
+#define dlmalloc_stats malloc_stats
|
|
|
+#define dlmalloc_usable_size malloc_usable_size
|
|
|
+#define dlmalloc_footprint malloc_footprint
|
|
|
+#define dlmalloc_max_footprint malloc_max_footprint
|
|
|
+#define dlindependent_calloc independent_calloc
|
|
|
+#define dlindependent_comalloc independent_comalloc
|
|
|
+#endif /* USE_DL_PREFIX */
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+ malloc(size_t n)
|
|
|
+ Returns a pointer to a newly allocated chunk of at least n bytes, or
|
|
|
+ null if no space is available, in which case errno is set to ENOMEM
|
|
|
+ on ANSI C systems.
|
|
|
+
|
|
|
+ If n is zero, malloc returns a minimum-sized chunk. (The minimum
|
|
|
+ size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
|
|
|
+ systems.) Note that size_t is an unsigned type, so calls with
|
|
|
+ arguments that would be negative if signed are interpreted as
|
|
|
+ requests for huge amounts of space, which will often fail. The
|
|
|
+ maximum supported value of n differs across systems, but is in all
|
|
|
+ cases less than the maximum representable value of a size_t.
|
|
|
+*/
|
|
|
+void* dlmalloc(size_t);
|
|
|
+
|
|
|
+/*
|
|
|
+ free(void* p)
|
|
|
+ Releases the chunk of memory pointed to by p, that had been previously
|
|
|
+ allocated using malloc or a related routine such as realloc.
|
|
|
+ It has no effect if p is null. If p was not malloced or already
|
|
|
+ freed, free(p) will by default cause the current program to abort.
|
|
|
+*/
|
|
|
+void dlfree(void*);
|
|
|
+
|
|
|
+/*
|
|
|
+ calloc(size_t n_elements, size_t element_size);
|
|
|
+ Returns a pointer to n_elements * element_size bytes, with all locations
|
|
|
+ set to zero.
|
|
|
+*/
|
|
|
+void* dlcalloc(size_t, size_t);
|
|
|
+
|
|
|
+/*
|
|
|
+ realloc(void* p, size_t n)
|
|
|
+ Returns a pointer to a chunk of size n that contains the same data
|
|
|
+ as does chunk p up to the minimum of (n, p's size) bytes, or null
|
|
|
+ if no space is available.
|
|
|
+
|
|
|
+ The returned pointer may or may not be the same as p. The algorithm
|
|
|
+ prefers extending p in most cases when possible, otherwise it
|
|
|
+ employs the equivalent of a malloc-copy-free sequence.
|
|
|
+
|
|
|
+ If p is null, realloc is equivalent to malloc.
|
|
|
+
|
|
|
+ If space is not available, realloc returns null, errno is set (if on
|
|
|
+ ANSI) and p is NOT freed.
|
|
|
+
|
|
|
+ if n is for fewer bytes than already held by p, the newly unused
|
|
|
+ space is lopped off and freed if possible. realloc with a size
|
|
|
+ argument of zero (re)allocates a minimum-sized chunk.
|
|
|
+
|
|
|
+ The old unix realloc convention of allowing the last-free'd chunk
|
|
|
+ to be used as an argument to realloc is not supported.
|
|
|
+*/
|
|
|
+
|
|
|
+void* dlrealloc(void*, size_t);
|
|
|
+
|
|
|
+/*
|
|
|
+ memalign(size_t alignment, size_t n);
|
|
|
+ Returns a pointer to a newly allocated chunk of n bytes, aligned
|
|
|
+ in accord with the alignment argument.
|
|
|
+
|
|
|
+ The alignment argument should be a power of two. If the argument is
|
|
|
+ not a power of two, the nearest greater power is used.
|
|
|
+ 8-byte alignment is guaranteed by normal malloc calls, so don't
|
|
|
+ bother calling memalign with an argument of 8 or less.
|
|
|
+
|
|
|
+ Overreliance on memalign is a sure way to fragment space.
|
|
|
+*/
|
|
|
+void* dlmemalign(size_t, size_t);
|
|
|
+
|
|
|
+/*
|
|
|
+ valloc(size_t n);
|
|
|
+ Equivalent to memalign(pagesize, n), where pagesize is the page
|
|
|
+ size of the system. If the pagesize is unknown, 4096 is used.
|
|
|
+*/
|
|
|
+void* dlvalloc(size_t);
|
|
|
+
|
|
|
+/*
|
|
|
+ mallopt(int parameter_number, int parameter_value)
|
|
|
+ Sets tunable parameters The format is to provide a
|
|
|
+ (parameter-number, parameter-value) pair. mallopt then sets the
|
|
|
+ corresponding parameter to the argument value if it can (i.e., so
|
|
|
+ long as the value is meaningful), and returns 1 if successful else
|
|
|
+ 0. To workaround the fact that mallopt is specified to use int,
|
|
|
+ not size_t parameters, the value -1 is specially treated as the
|
|
|
+ maximum unsigned size_t value.
|
|
|
+
|
|
|
+ SVID/XPG/ANSI defines four standard param numbers for mallopt,
|
|
|
+ normally defined in malloc.h. None of these are use in this malloc,
|
|
|
+ so setting them has no effect. But this malloc also supports other
|
|
|
+ options in mallopt. See below for details. Briefly, supported
|
|
|
+ parameters are as follows (listed defaults are for "typical"
|
|
|
+ configurations).
|
|
|
+
|
|
|
+ Symbol param # default allowed param values
|
|
|
+ M_TRIM_THRESHOLD -1 2*1024*1024 any (-1 disables)
|
|
|
+ M_GRANULARITY -2 page size any power of 2 >= page size
|
|
|
+ M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
|
|
|
+*/
|
|
|
+int dlmallopt(int, int);
|
|
|
+
|
|
|
+/*
|
|
|
+ malloc_footprint();
|
|
|
+ Returns the number of bytes obtained from the system. The total
|
|
|
+ number of bytes allocated by malloc, realloc etc., is less than this
|
|
|
+ value. Unlike mallinfo, this function returns only a precomputed
|
|
|
+ result, so can be called frequently to monitor memory consumption.
|
|
|
+ Even if locks are otherwise defined, this function does not use them,
|
|
|
+ so results might not be up to date.
|
|
|
+*/
|
|
|
+size_t dlmalloc_footprint(void);
|
|
|
+
|
|
|
+/*
|
|
|
+ malloc_max_footprint();
|
|
|
+ Returns the maximum number of bytes obtained from the system. This
|
|
|
+ value will be greater than current footprint if deallocated space
|
|
|
+ has been reclaimed by the system. The peak number of bytes allocated
|
|
|
+ by malloc, realloc etc., is less than this value. Unlike mallinfo,
|
|
|
+ this function returns only a precomputed result, so can be called
|
|
|
+ frequently to monitor memory consumption. Even if locks are
|
|
|
+ otherwise defined, this function does not use them, so results might
|
|
|
+ not be up to date.
|
|
|
+*/
|
|
|
+size_t dlmalloc_max_footprint(void);
|
|
|
+
|
|
|
+#if !NO_MALLINFO
|
|
|
+/*
|
|
|
+ mallinfo()
|
|
|
+ Returns (by copy) a struct containing various summary statistics:
|
|
|
+
|
|
|
+ arena: current total non-mmapped bytes allocated from system
|
|
|
+ ordblks: the number of free chunks
|
|
|
+ smblks: always zero.
|
|
|
+ hblks: current number of mmapped regions
|
|
|
+ hblkhd: total bytes held in mmapped regions
|
|
|
+ usmblks: the maximum total allocated space. This will be greater
|
|
|
+ than current total if trimming has occurred.
|
|
|
+ fsmblks: always zero
|
|
|
+ uordblks: current total allocated space (normal or mmapped)
|
|
|
+ fordblks: total free space
|
|
|
+ keepcost: the maximum number of bytes that could ideally be released
|
|
|
+ back to system via malloc_trim. ("ideally" means that
|
|
|
+ it ignores page restrictions etc.)
|
|
|
+
|
|
|
+ Because these fields are ints, but internal bookkeeping may
|
|
|
+ be kept as longs, the reported values may wrap around zero and
|
|
|
+ thus be inaccurate.
|
|
|
+*/
|
|
|
+struct mallinfo dlmallinfo(void);
|
|
|
+#endif /* NO_MALLINFO */
|
|
|
+
|
|
|
+/*
|
|
|
+ independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
|
|
|
+
|
|
|
+ independent_calloc is similar to calloc, but instead of returning a
|
|
|
+ single cleared space, it returns an array of pointers to n_elements
|
|
|
+ independent elements that can hold contents of size elem_size, each
|
|
|
+ of which starts out cleared, and can be independently freed,
|
|
|
+ realloc'ed etc. The elements are guaranteed to be adjacently
|
|
|
+ allocated (this is not guaranteed to occur with multiple callocs or
|
|
|
+ mallocs), which may also improve cache locality in some
|
|
|
+ applications.
|
|
|
+
|
|
|
+ The "chunks" argument is optional (i.e., may be null, which is
|
|
|
+ probably the most typical usage). If it is null, the returned array
|
|
|
+ is itself dynamically allocated and should also be freed when it is
|
|
|
+ no longer needed. Otherwise, the chunks array must be of at least
|
|
|
+ n_elements in length. It is filled in with the pointers to the
|
|
|
+ chunks.
|
|
|
+
|
|
|
+ In either case, independent_calloc returns this pointer array, or
|
|
|
+ null if the allocation failed. If n_elements is zero and "chunks"
|
|
|
+ is null, it returns a chunk representing an array with zero elements
|
|
|
+ (which should be freed if not wanted).
|
|
|
+
|
|
|
+ Each element must be individually freed when it is no longer
|
|
|
+ needed. If you'd like to instead be able to free all at once, you
|
|
|
+ should instead use regular calloc and assign pointers into this
|
|
|
+ space to represent elements. (In this case though, you cannot
|
|
|
+ independently free elements.)
|
|
|
+
|
|
|
+ independent_calloc simplifies and speeds up implementations of many
|
|
|
+ kinds of pools. It may also be useful when constructing large data
|
|
|
+ structures that initially have a fixed number of fixed-sized nodes,
|
|
|
+ but the number is not known at compile time, and some of the nodes
|
|
|
+ may later need to be freed. For example:
|
|
|
+
|
|
|
+ struct Node { int item; struct Node* next; };
|
|
|
+
|
|
|
+ struct Node* build_list() {
|
|
|
+ struct Node** pool;
|
|
|
+ int n = read_number_of_nodes_needed();
|
|
|
+ if (n <= 0) return 0;
|
|
|
+ pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
|
|
|
+ if (pool == 0) die();
|
|
|
+ // organize into a linked list...
|
|
|
+ struct Node* first = pool[0];
|
|
|
+ for (i = 0; i < n-1; ++i)
|
|
|
+ pool[i]->next = pool[i+1];
|
|
|
+ free(pool); // Can now free the array (or not, if it is needed later)
|
|
|
+ return first;
|
|
|
+ }
|
|
|
+*/
|
|
|
+void** dlindependent_calloc(size_t, size_t, void**);
|
|
|
+
|
|
|
+/*
|
|
|
+ independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
|
|
|
+
|
|
|
+ independent_comalloc allocates, all at once, a set of n_elements
|
|
|
+ chunks with sizes indicated in the "sizes" array. It returns
|
|
|
+ an array of pointers to these elements, each of which can be
|
|
|
+ independently freed, realloc'ed etc. The elements are guaranteed to
|
|
|
+ be adjacently allocated (this is not guaranteed to occur with
|
|
|
+ multiple callocs or mallocs), which may also improve cache locality
|
|
|
+ in some applications.
|
|
|
+
|
|
|
+ The "chunks" argument is optional (i.e., may be null). If it is null
|
|
|
+ the returned array is itself dynamically allocated and should also
|
|
|
+ be freed when it is no longer needed. Otherwise, the chunks array
|
|
|
+ must be of at least n_elements in length. It is filled in with the
|
|
|
+ pointers to the chunks.
|
|
|
+
|
|
|
+ In either case, independent_comalloc returns this pointer array, or
|
|
|
+ null if the allocation failed. If n_elements is zero and chunks is
|
|
|
+ null, it returns a chunk representing an array with zero elements
|
|
|
+ (which should be freed if not wanted).
|
|
|
+
|
|
|
+ Each element must be individually freed when it is no longer
|
|
|
+ needed. If you'd like to instead be able to free all at once, you
|
|
|
+ should instead use a single regular malloc, and assign pointers at
|
|
|
+ particular offsets in the aggregate space. (In this case though, you
|
|
|
+ cannot independently free elements.)
|
|
|
+
|
|
|
+ independent_comallac differs from independent_calloc in that each
|
|
|
+ element may have a different size, and also that it does not
|
|
|
+ automatically clear elements.
|
|
|
+
|
|
|
+ independent_comalloc can be used to speed up allocation in cases
|
|
|
+ where several structs or objects must always be allocated at the
|
|
|
+ same time. For example:
|
|
|
+
|
|
|
+ struct Head { ... }
|
|
|
+ struct Foot { ... }
|
|
|
+
|
|
|
+ void send_message(char* msg) {
|
|
|
+ int msglen = strlen(msg);
|
|
|
+ size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
|
|
|
+ void* chunks[3];
|
|
|
+ if (independent_comalloc(3, sizes, chunks) == 0)
|
|
|
+ die();
|
|
|
+ struct Head* head = (struct Head*)(chunks[0]);
|
|
|
+ char* body = (char*)(chunks[1]);
|
|
|
+ struct Foot* foot = (struct Foot*)(chunks[2]);
|
|
|
+ // ...
|
|
|
+ }
|
|
|
+
|
|
|
+ In general though, independent_comalloc is worth using only for
|
|
|
+ larger values of n_elements. For small values, you probably won't
|
|
|
+ detect enough difference from series of malloc calls to bother.
|
|
|
+
|
|
|
+ Overuse of independent_comalloc can increase overall memory usage,
|
|
|
+ since it cannot reuse existing noncontiguous small chunks that
|
|
|
+ might be available for some of the elements.
|
|
|
+*/
|
|
|
+void** dlindependent_comalloc(size_t, size_t*, void**);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+ pvalloc(size_t n);
|
|
|
+ Equivalent to valloc(minimum-page-that-holds(n)), that is,
|
|
|
+ round up n to nearest pagesize.
|
|
|
+ */
|
|
|
+void* dlpvalloc(size_t);
|
|
|
+
|
|
|
+/*
|
|
|
+ malloc_trim(size_t pad);
|
|
|
+
|
|
|
+ If possible, gives memory back to the system (via negative arguments
|
|
|
+ to sbrk) if there is unused memory at the `high' end of the malloc
|
|
|
+ pool or in unused MMAP segments. You can call this after freeing
|
|
|
+ large blocks of memory to potentially reduce the system-level memory
|
|
|
+ requirements of a program. However, it cannot guarantee to reduce
|
|
|
+ memory. Under some allocation patterns, some large free blocks of
|
|
|
+ memory will be locked between two used chunks, so they cannot be
|
|
|
+ given back to the system.
|
|
|
+
|
|
|
+ The `pad' argument to malloc_trim represents the amount of free
|
|
|
+ trailing space to leave untrimmed. If this argument is zero, only
|
|
|
+ the minimum amount of memory to maintain internal data structures
|
|
|
+ will be left. Non-zero arguments can be supplied to maintain enough
|
|
|
+ trailing space to service future expected allocations without having
|
|
|
+ to re-obtain memory from the system.
|
|
|
+
|
|
|
+ Malloc_trim returns 1 if it actually released any memory, else 0.
|
|
|
+*/
|
|
|
+int dlmalloc_trim(size_t);
|
|
|
+
|
|
|
+/*
|
|
|
+ malloc_stats();
|
|
|
+ Prints on stderr the amount of space obtained from the system (both
|
|
|
+ via sbrk and mmap), the maximum amount (which may be more than
|
|
|
+ current if malloc_trim and/or munmap got called), and the current
|
|
|
+ number of bytes allocated via malloc (or realloc, etc) but not yet
|
|
|
+ freed. Note that this is the number of bytes allocated, not the
|
|
|
+ number requested. It will be larger than the number requested
|
|
|
+ because of alignment and bookkeeping overhead. Because it includes
|
|
|
+ alignment wastage as being in use, this figure may be greater than
|
|
|
+ zero even when no user-level chunks are allocated.
|
|
|
+
|
|
|
+ The reported current and maximum system memory can be inaccurate if
|
|
|
+ a program makes other calls to system memory allocation functions
|
|
|
+ (normally sbrk) outside of malloc.
|
|
|
+
|
|
|
+ malloc_stats prints only the most commonly interesting statistics.
|
|
|
+ More information can be obtained by calling mallinfo.
|
|
|
+*/
|
|
|
+void dlmalloc_stats(void);
|
|
|
+
|
|
|
+#endif /* ONLY_MSPACES */
|
|
|
+
|
|
|
+/*
|
|
|
+ malloc_usable_size(void* p);
|
|
|
+
|
|
|
+ Returns the number of bytes you can actually use in
|
|
|
+ an allocated chunk, which may be more than you requested (although
|
|
|
+ often not) due to alignment and minimum size constraints.
|
|
|
+ You can use this many bytes without worrying about
|
|
|
+ overwriting other allocated objects. This is not a particularly great
|
|
|
+ programming practice. malloc_usable_size can be more useful in
|
|
|
+ debugging and assertions, for example:
|
|
|
+
|
|
|
+ p = malloc(n);
|
|
|
+ assert(malloc_usable_size(p) >= 256);
|
|
|
+*/
|
|
|
+size_t dlmalloc_usable_size(void*);
|
|
|
+
|
|
|
+
|
|
|
+#if MSPACES
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace is an opaque type representing an independent
|
|
|
+ region of space that supports mspace_malloc, etc.
|
|
|
+*/
|
|
|
+typedef void* mspace;
|
|
|
+
|
|
|
+/*
|
|
|
+ create_mspace creates and returns a new independent space with the
|
|
|
+ given initial capacity, or, if 0, the default granularity size. It
|
|
|
+ returns null if there is no system memory available to create the
|
|
|
+ space. If argument locked is non-zero, the space uses a separate
|
|
|
+ lock to control access. The capacity of the space will grow
|
|
|
+ dynamically as needed to service mspace_malloc requests. You can
|
|
|
+ control the sizes of incremental increases of this space by
|
|
|
+ compiling with a different DEFAULT_GRANULARITY or dynamically
|
|
|
+ setting with mallopt(M_GRANULARITY, value).
|
|
|
+*/
|
|
|
+mspace create_mspace(size_t capacity, int locked);
|
|
|
+
|
|
|
+/*
|
|
|
+ destroy_mspace destroys the given space, and attempts to return all
|
|
|
+ of its memory back to the system, returning the total number of
|
|
|
+ bytes freed. After destruction, the results of access to all memory
|
|
|
+ used by the space become undefined.
|
|
|
+*/
|
|
|
+size_t destroy_mspace(mspace msp);
|
|
|
+
|
|
|
+/*
|
|
|
+ create_mspace_with_base uses the memory supplied as the initial base
|
|
|
+ of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
|
|
|
+ space is used for bookkeeping, so the capacity must be at least this
|
|
|
+ large. (Otherwise 0 is returned.) When this initial space is
|
|
|
+ exhausted, additional memory will be obtained from the system.
|
|
|
+ Destroying this space will deallocate all additionally allocated
|
|
|
+ space (if possible) but not the initial base.
|
|
|
+*/
|
|
|
+mspace create_mspace_with_base(void* base, size_t capacity, int locked);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_track_large_chunks controls whether requests for large chunks
|
|
|
+ are allocated in their own untracked mmapped regions, separate from
|
|
|
+ others in this mspace. By default large chunks are not tracked,
|
|
|
+ which reduces fragmentation. However, such chunks are not
|
|
|
+ necessarily released to the system upon destroy_mspace. Enabling
|
|
|
+ tracking by setting to true may increase fragmentation, but avoids
|
|
|
+ leakage when relying on destroy_mspace to release all memory
|
|
|
+ allocated using this space. The function returns the previous
|
|
|
+ setting.
|
|
|
+*/
|
|
|
+int mspace_track_large_chunks(mspace msp, int enable);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_malloc behaves as malloc, but operates within
|
|
|
+ the given space.
|
|
|
+*/
|
|
|
+void* mspace_malloc(mspace msp, size_t bytes);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_free behaves as free, but operates within
|
|
|
+ the given space.
|
|
|
+
|
|
|
+ If compiled with FOOTERS==1, mspace_free is not actually needed.
|
|
|
+ free may be called instead of mspace_free because freed chunks from
|
|
|
+ any space are handled by their originating spaces.
|
|
|
+*/
|
|
|
+void mspace_free(mspace msp, void* mem);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_realloc behaves as realloc, but operates within
|
|
|
+ the given space.
|
|
|
+
|
|
|
+ If compiled with FOOTERS==1, mspace_realloc is not actually
|
|
|
+ needed. realloc may be called instead of mspace_realloc because
|
|
|
+ realloced chunks from any space are handled by their originating
|
|
|
+ spaces.
|
|
|
+*/
|
|
|
+void* mspace_realloc(mspace msp, void* mem, size_t newsize);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_calloc behaves as calloc, but operates within
|
|
|
+ the given space.
|
|
|
+*/
|
|
|
+void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_memalign behaves as memalign, but operates within
|
|
|
+ the given space.
|
|
|
+*/
|
|
|
+void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_independent_calloc behaves as independent_calloc, but
|
|
|
+ operates within the given space.
|
|
|
+*/
|
|
|
+void** mspace_independent_calloc(mspace msp, size_t n_elements,
|
|
|
+ size_t elem_size, void* chunks[]);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_independent_comalloc behaves as independent_comalloc, but
|
|
|
+ operates within the given space.
|
|
|
+*/
|
|
|
+void** mspace_independent_comalloc(mspace msp, size_t n_elements,
|
|
|
+ size_t sizes[], void* chunks[]);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_footprint() returns the number of bytes obtained from the
|
|
|
+ system for this space.
|
|
|
+*/
|
|
|
+size_t mspace_footprint(mspace msp);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_max_footprint() returns the peak number of bytes obtained from the
|
|
|
+ system for this space.
|
|
|
+*/
|
|
|
+size_t mspace_max_footprint(mspace msp);
|
|
|
+
|
|
|
+
|
|
|
+#if !NO_MALLINFO
|
|
|
+/*
|
|
|
+ mspace_mallinfo behaves as mallinfo, but reports properties of
|
|
|
+ the given space.
|
|
|
+*/
|
|
|
+struct mallinfo mspace_mallinfo(mspace msp);
|
|
|
+#endif /* NO_MALLINFO */
|
|
|
+
|
|
|
+/*
|
|
|
+ malloc_usable_size(void* p) behaves the same as malloc_usable_size;
|
|
|
+*/
|
|
|
+ size_t mspace_usable_size(void* mem);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_malloc_stats behaves as malloc_stats, but reports
|
|
|
+ properties of the given space.
|
|
|
+*/
|
|
|
+void mspace_malloc_stats(mspace msp);
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace_trim behaves as malloc_trim, but
|
|
|
+ operates within the given space.
|
|
|
+*/
|
|
|
+int mspace_trim(mspace msp, size_t pad);
|
|
|
+
|
|
|
+/*
|
|
|
+ An alias for mallopt.
|
|
|
+*/
|
|
|
+int mspace_mallopt(int, int);
|
|
|
+
|
|
|
+#endif /* MSPACES */
|
|
|
+
|
|
|
+#ifdef __cplusplus
|
|
|
+} /* end of extern "C" */
|
|
|
+#endif /* __cplusplus */
|
|
|
+
|
|
|
+/*
|
|
|
+ ========================================================================
|
|
|
+ To make a fully customizable malloc.h header file, cut everything
|
|
|
+ above this line, put into file malloc.h, edit to suit, and #include it
|
|
|
+ on the next line, as well as in programs that use this malloc.
|
|
|
+ ========================================================================
|
|
|
+*/
|
|
|
+
|
|
|
+/* #include "malloc.h" */
|
|
|
+
|
|
|
+/*------------------------------ internal #includes ---------------------- */
|
|
|
+
|
|
|
+#ifdef WIN32
|
|
|
+#pragma warning( disable : 4146 ) /* no "unsigned" warnings */
|
|
|
+#endif /* WIN32 */
|
|
|
+
|
|
|
+#include <stdio.h> /* for printing in malloc_stats */
|
|
|
+
|
|
|
+#ifndef LACKS_ERRNO_H
|
|
|
+#include <errno.h> /* for MALLOC_FAILURE_ACTION */
|
|
|
+#endif /* LACKS_ERRNO_H */
|
|
|
+#if FOOTERS || DEBUG
|
|
|
+#include <time.h> /* for magic initialization */
|
|
|
+#endif /* FOOTERS */
|
|
|
+#ifndef LACKS_STDLIB_H
|
|
|
+#include <stdlib.h> /* for abort() */
|
|
|
+#endif /* LACKS_STDLIB_H */
|
|
|
+#ifdef DEBUG
|
|
|
+#if ABORT_ON_ASSERT_FAILURE
|
|
|
+#undef assert
|
|
|
+#define assert(x) if(!(x)) ABORT
|
|
|
+#else /* ABORT_ON_ASSERT_FAILURE */
|
|
|
+#include <assert.h>
|
|
|
+#endif /* ABORT_ON_ASSERT_FAILURE */
|
|
|
+#else /* DEBUG */
|
|
|
+#ifndef assert
|
|
|
+#define assert(x)
|
|
|
+#endif
|
|
|
+#define DEBUG 0
|
|
|
+#endif /* DEBUG */
|
|
|
+#ifndef LACKS_STRING_H
|
|
|
+#include <string.h> /* for memset etc */
|
|
|
+#endif /* LACKS_STRING_H */
|
|
|
+#if USE_BUILTIN_FFS
|
|
|
+#ifndef LACKS_STRINGS_H
|
|
|
+#include <strings.h> /* for ffs */
|
|
|
+#endif /* LACKS_STRINGS_H */
|
|
|
+#endif /* USE_BUILTIN_FFS */
|
|
|
+#if HAVE_MMAP
|
|
|
+#ifndef LACKS_SYS_MMAN_H
|
|
|
+/* On some versions of linux, mremap decl in mman.h needs __USE_GNU set */
|
|
|
+#if (defined(linux) && !defined(__USE_GNU))
|
|
|
+#define __USE_GNU 1
|
|
|
+#include <sys/mman.h> /* for mmap */
|
|
|
+#undef __USE_GNU
|
|
|
+#else
|
|
|
+#include <sys/mman.h> /* for mmap */
|
|
|
+#endif /* linux */
|
|
|
+#endif /* LACKS_SYS_MMAN_H */
|
|
|
+#ifndef LACKS_FCNTL_H
|
|
|
+#include <fcntl.h>
|
|
|
+#endif /* LACKS_FCNTL_H */
|
|
|
+#endif /* HAVE_MMAP */
|
|
|
+#ifndef LACKS_UNISTD_H
|
|
|
+#include <unistd.h> /* for sbrk, sysconf */
|
|
|
+#else /* LACKS_UNISTD_H */
|
|
|
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
|
|
|
+extern void* sbrk(ptrdiff_t);
|
|
|
+#endif /* FreeBSD etc */
|
|
|
+#endif /* LACKS_UNISTD_H */
|
|
|
+
|
|
|
+/* Declarations for locking */
|
|
|
+#if USE_LOCKS
|
|
|
+#ifndef WIN32
|
|
|
+#include <pthread.h>
|
|
|
+#if defined (__SVR4) && defined (__sun) /* solaris */
|
|
|
+#include <thread.h>
|
|
|
+#endif /* solaris */
|
|
|
+#else
|
|
|
+#ifndef _M_AMD64
|
|
|
+/* These are already defined on AMD64 builds */
|
|
|
+#ifdef __cplusplus
|
|
|
+extern "C" {
|
|
|
+#endif /* __cplusplus */
|
|
|
+LONG __cdecl _InterlockedCompareExchange(LONG volatile *Dest, LONG Exchange, LONG Comp);
|
|
|
+LONG __cdecl _InterlockedExchange(LONG volatile *Target, LONG Value);
|
|
|
+#ifdef __cplusplus
|
|
|
+}
|
|
|
+#endif /* __cplusplus */
|
|
|
+#endif /* _M_AMD64 */
|
|
|
+#pragma intrinsic (_InterlockedCompareExchange)
|
|
|
+#pragma intrinsic (_InterlockedExchange)
|
|
|
+#define interlockedcompareexchange _InterlockedCompareExchange
|
|
|
+#define interlockedexchange _InterlockedExchange
|
|
|
+#endif /* Win32 */
|
|
|
+#endif /* USE_LOCKS */
|
|
|
+
|
|
|
+/* Declarations for bit scanning on win32 */
|
|
|
+#if defined(_MSC_VER) && _MSC_VER>=1300
|
|
|
+#ifndef BitScanForward /* Try to avoid pulling in WinNT.h */
|
|
|
+#ifdef __cplusplus
|
|
|
+extern "C" {
|
|
|
+#endif /* __cplusplus */
|
|
|
+unsigned char _BitScanForward(unsigned long *index, unsigned long mask);
|
|
|
+unsigned char _BitScanReverse(unsigned long *index, unsigned long mask);
|
|
|
+#ifdef __cplusplus
|
|
|
+}
|
|
|
+#endif /* __cplusplus */
|
|
|
+
|
|
|
+#define BitScanForward _BitScanForward
|
|
|
+#define BitScanReverse _BitScanReverse
|
|
|
+#pragma intrinsic(_BitScanForward)
|
|
|
+#pragma intrinsic(_BitScanReverse)
|
|
|
+#endif /* BitScanForward */
|
|
|
+#endif /* defined(_MSC_VER) && _MSC_VER>=1300 */
|
|
|
+
|
|
|
+#ifndef WIN32
|
|
|
+#ifndef malloc_getpagesize
|
|
|
+# ifdef _SC_PAGESIZE /* some SVR4 systems omit an underscore */
|
|
|
+# ifndef _SC_PAGE_SIZE
|
|
|
+# define _SC_PAGE_SIZE _SC_PAGESIZE
|
|
|
+# endif
|
|
|
+# endif
|
|
|
+# ifdef _SC_PAGE_SIZE
|
|
|
+# define malloc_getpagesize sysconf(_SC_PAGE_SIZE)
|
|
|
+# else
|
|
|
+# if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE)
|
|
|
+ extern size_t getpagesize();
|
|
|
+# define malloc_getpagesize getpagesize()
|
|
|
+# else
|
|
|
+# ifdef WIN32 /* use supplied emulation of getpagesize */
|
|
|
+# define malloc_getpagesize getpagesize()
|
|
|
+# else
|
|
|
+# ifndef LACKS_SYS_PARAM_H
|
|
|
+# include <sys/param.h>
|
|
|
+# endif
|
|
|
+# ifdef EXEC_PAGESIZE
|
|
|
+# define malloc_getpagesize EXEC_PAGESIZE
|
|
|
+# else
|
|
|
+# ifdef NBPG
|
|
|
+# ifndef CLSIZE
|
|
|
+# define malloc_getpagesize NBPG
|
|
|
+# else
|
|
|
+# define malloc_getpagesize (NBPG * CLSIZE)
|
|
|
+# endif
|
|
|
+# else
|
|
|
+# ifdef NBPC
|
|
|
+# define malloc_getpagesize NBPC
|
|
|
+# else
|
|
|
+# ifdef PAGESIZE
|
|
|
+# define malloc_getpagesize PAGESIZE
|
|
|
+# else /* just guess */
|
|
|
+# define malloc_getpagesize ((size_t)4096U)
|
|
|
+# endif
|
|
|
+# endif
|
|
|
+# endif
|
|
|
+# endif
|
|
|
+# endif
|
|
|
+# endif
|
|
|
+# endif
|
|
|
+#endif
|
|
|
+#endif
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+/* ------------------- size_t and alignment properties -------------------- */
|
|
|
+
|
|
|
+/* The byte and bit size of a size_t */
|
|
|
+#define SIZE_T_SIZE (sizeof(size_t))
|
|
|
+#define SIZE_T_BITSIZE (sizeof(size_t) << 3)
|
|
|
+
|
|
|
+/* Some constants coerced to size_t */
|
|
|
+/* Annoying but necessary to avoid errors on some platforms */
|
|
|
+#define SIZE_T_ZERO ((size_t)0)
|
|
|
+#define SIZE_T_ONE ((size_t)1)
|
|
|
+#define SIZE_T_TWO ((size_t)2)
|
|
|
+#define SIZE_T_FOUR ((size_t)4)
|
|
|
+#define TWO_SIZE_T_SIZES (SIZE_T_SIZE<<1)
|
|
|
+#define FOUR_SIZE_T_SIZES (SIZE_T_SIZE<<2)
|
|
|
+#define SIX_SIZE_T_SIZES (FOUR_SIZE_T_SIZES+TWO_SIZE_T_SIZES)
|
|
|
+#define HALF_MAX_SIZE_T (MAX_SIZE_T / 2U)
|
|
|
+
|
|
|
+/* The bit mask value corresponding to MALLOC_ALIGNMENT */
|
|
|
+#define CHUNK_ALIGN_MASK (MALLOC_ALIGNMENT - SIZE_T_ONE)
|
|
|
+
|
|
|
+/* True if address a has acceptable alignment */
|
|
|
+#define is_aligned(A) (((size_t)((A)) & (CHUNK_ALIGN_MASK)) == 0)
|
|
|
+
|
|
|
+/* the number of bytes to offset an address to align it */
|
|
|
+#define align_offset(A)\
|
|
|
+ ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\
|
|
|
+ ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK))
|
|
|
+
|
|
|
+/*
|
|
|
+ malloc_params holds global properties, including those that can be
|
|
|
+ dynamically set using mallopt. There is a single instance, mparams,
|
|
|
+ initialized in init_mparams. Note that the non-zeroness of "magic"
|
|
|
+ also serves as an initialization flag.
|
|
|
+*/
|
|
|
+typedef unsigned int flag_t;
|
|
|
+struct malloc_params {
|
|
|
+ volatile size_t magic;
|
|
|
+ size_t page_size;
|
|
|
+ size_t granularity;
|
|
|
+ size_t mmap_threshold;
|
|
|
+ size_t trim_threshold;
|
|
|
+ flag_t default_mflags;
|
|
|
+};
|
|
|
+
|
|
|
+static struct malloc_params mparams;
|
|
|
+
|
|
|
+/* Ensure mparams initialized */
|
|
|
+#define ensure_initialization() (void)(mparams.magic != 0 || init_mparams())
|
|
|
+
|
|
|
+/* -------------------------- MMAP preliminaries ------------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ If HAVE_MORECORE or HAVE_MMAP are false, we just define calls and
|
|
|
+ checks to fail so compiler optimizer can delete code rather than
|
|
|
+ using so many "#if"s.
|
|
|
+*/
|
|
|
+
|
|
|
+
|
|
|
+/* MORECORE and MMAP must return MFAIL on failure */
|
|
|
+#define MFAIL ((void*)(MAX_SIZE_T))
|
|
|
+#define CMFAIL ((char*)(MFAIL)) /* defined for convenience */
|
|
|
+
|
|
|
+#if HAVE_MMAP
|
|
|
+
|
|
|
+#ifndef WIN32
|
|
|
+#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
|
|
|
+#define MAP_ANONYMOUS MAP_ANON
|
|
|
+#endif /* MAP_ANON */
|
|
|
+#ifdef DEFAULT_GRANULARITY_ALIGNED
|
|
|
+#define MMAP_IMPL mmap_aligned
|
|
|
+static void* lastAlignedmmap; /* Used as a hint */
|
|
|
+static void* mmap_aligned(void *start, size_t length, int prot, int flags, int fd, off_t offset) {
|
|
|
+ void* baseaddress = 0;
|
|
|
+ void* ptr = 0;
|
|
|
+ if(!start) {
|
|
|
+ baseaddress = lastAlignedmmap;
|
|
|
+ for(;;) {
|
|
|
+ if(baseaddress) flags|=MAP_FIXED;
|
|
|
+ ptr = mmap(baseaddress, length, prot, flags, fd, offset);
|
|
|
+ if(!ptr)
|
|
|
+ baseaddress = (void*)((size_t)baseaddress + mparams.granularity);
|
|
|
+ else if((size_t)ptr & (mparams.granularity - SIZE_T_ONE)) {
|
|
|
+ munmap(ptr, length);
|
|
|
+ baseaddress = (void*)(((size_t)ptr + mparams.granularity) & ~(mparams.granularity - SIZE_T_ONE));
|
|
|
+ }
|
|
|
+ else break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else ptr = mmap(start, length, prot, flags, fd, offset);
|
|
|
+ if(ptr) lastAlignedmmap = (void*)((size_t) ptr + mparams.granularity);
|
|
|
+ return ptr;
|
|
|
+}
|
|
|
+#else
|
|
|
+#define MMAP_IMPL mmap
|
|
|
+#endif /* DEFAULT_GRANULARITY_ALIGNED */
|
|
|
+#define MUNMAP_DEFAULT(a, s) munmap((a), (s))
|
|
|
+#define MMAP_PROT (PROT_READ|PROT_WRITE)
|
|
|
+#ifdef MAP_ANONYMOUS
|
|
|
+#define MMAP_FLAGS (MAP_PRIVATE|MAP_ANONYMOUS)
|
|
|
+#define MMAP_DEFAULT(s) MMAP_IMPL(0, (s), MMAP_PROT, MMAP_FLAGS, -1, 0)
|
|
|
+#else /* MAP_ANONYMOUS */
|
|
|
+/*
|
|
|
+ Nearly all versions of mmap support MAP_ANONYMOUS, so the following
|
|
|
+ is unlikely to be needed, but is supplied just in case.
|
|
|
+*/
|
|
|
+#define MMAP_FLAGS (MAP_PRIVATE)
|
|
|
+static int dev_zero_fd = -1; /* Cached file descriptor for /dev/zero. */
|
|
|
+#define MMAP_DEFAULT(s) ((dev_zero_fd < 0) ? \
|
|
|
+ (dev_zero_fd = open("/dev/zero", O_RDWR), \
|
|
|
+ MMAP_IMPL(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) : \
|
|
|
+ MMAP_IMPL(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0))
|
|
|
+#endif /* MAP_ANONYMOUS */
|
|
|
+
|
|
|
+#define DIRECT_MMAP_DEFAULT(s) MMAP_DEFAULT(s)
|
|
|
+
|
|
|
+#else /* WIN32 */
|
|
|
+
|
|
|
+/* Win32 MMAP via VirtualAlloc */
|
|
|
+#ifdef DEFAULT_GRANULARITY_ALIGNED
|
|
|
+static void* lastWin32mmap; /* Used as a hint */
|
|
|
+#endif /* DEFAULT_GRANULARITY_ALIGNED */
|
|
|
+#ifdef ENABLE_LARGE_PAGES
|
|
|
+static int largepagesavailable = 1;
|
|
|
+#endif /* ENABLE_LARGE_PAGES */
|
|
|
+static FORCEINLINE void* win32mmap(size_t size) {
|
|
|
+ void* baseaddress = 0;
|
|
|
+ void* ptr = 0;
|
|
|
+#ifdef ENABLE_LARGE_PAGES
|
|
|
+ /* Note that large pages are *always* allocated on a large page boundary.
|
|
|
+ If however granularity is small then don't waste a kernel call if size
|
|
|
+ isn't around the size of a large page */
|
|
|
+ if(largepagesavailable && size >= 1*1024*1024) {
|
|
|
+ ptr = VirtualAlloc(baseaddress, size, MEM_RESERVE|MEM_COMMIT|MEM_LARGE_PAGES, PAGE_READWRITE);
|
|
|
+ if(!ptr && ERROR_PRIVILEGE_NOT_HELD==GetLastError()) largepagesavailable=0;
|
|
|
+ }
|
|
|
+#endif
|
|
|
+ if(!ptr) {
|
|
|
+#ifdef DEFAULT_GRANULARITY_ALIGNED
|
|
|
+ /* We try to avoid overhead by speculatively reserving at aligned
|
|
|
+ addresses until we succeed */
|
|
|
+ baseaddress = lastWin32mmap;
|
|
|
+ for(;;) {
|
|
|
+ void* reserveaddr = VirtualAlloc(baseaddress, size, MEM_RESERVE, PAGE_READWRITE);
|
|
|
+ if(!reserveaddr)
|
|
|
+ baseaddress = (void*)((size_t)baseaddress + mparams.granularity);
|
|
|
+ else if((size_t)reserveaddr & (mparams.granularity - SIZE_T_ONE)) {
|
|
|
+ VirtualFree(reserveaddr, 0, MEM_RELEASE);
|
|
|
+ baseaddress = (void*)(((size_t)reserveaddr + mparams.granularity) & ~(mparams.granularity - SIZE_T_ONE));
|
|
|
+ }
|
|
|
+ else break;
|
|
|
+ }
|
|
|
+#endif
|
|
|
+ if(!ptr) ptr = VirtualAlloc(baseaddress, size, baseaddress ? MEM_COMMIT : MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
|
|
|
+#if DEBUG
|
|
|
+ if(lastWin32mmap && ptr!=lastWin32mmap) printf("Non-contiguous VirtualAlloc between %p and %p\n", ptr, lastWin32mmap);
|
|
|
+#endif
|
|
|
+#ifdef DEFAULT_GRANULARITY_ALIGNED
|
|
|
+ if(ptr) lastWin32mmap = (void*)((size_t) ptr + mparams.granularity);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+#if DEBUG
|
|
|
+#ifdef ENABLE_LARGE_PAGES
|
|
|
+ printf("VirtualAlloc returns %p size %u. LargePagesAvailable=%d\n", ptr, size, largepagesavailable);
|
|
|
+#else
|
|
|
+ printf("VirtualAlloc returns %p size %u\n", ptr, size);
|
|
|
+#endif
|
|
|
+#endif
|
|
|
+ return (ptr != 0)? ptr: MFAIL;
|
|
|
+}
|
|
|
+
|
|
|
+/* For direct MMAP, use MEM_TOP_DOWN to minimize interference */
|
|
|
+static FORCEINLINE void* win32direct_mmap(size_t size) {
|
|
|
+ void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN,
|
|
|
+ PAGE_READWRITE);
|
|
|
+ return (ptr != 0)? ptr: MFAIL;
|
|
|
+}
|
|
|
+
|
|
|
+/* This function supports releasing coalesed segments */
|
|
|
+static FORCEINLINE int win32munmap(void* ptr, size_t size) {
|
|
|
+ MEMORY_BASIC_INFORMATION minfo;
|
|
|
+ char* cptr = (char*)ptr;
|
|
|
+ while (size) {
|
|
|
+ if (VirtualQuery(cptr, &minfo, sizeof(minfo)) == 0)
|
|
|
+ return -1;
|
|
|
+ if (minfo.BaseAddress != cptr || minfo.AllocationBase != cptr ||
|
|
|
+ minfo.State != MEM_COMMIT || minfo.RegionSize > size)
|
|
|
+ return -1;
|
|
|
+ if (VirtualFree(cptr, 0, MEM_RELEASE) == 0)
|
|
|
+ return -1;
|
|
|
+ cptr += minfo.RegionSize;
|
|
|
+ size -= minfo.RegionSize;
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+#define MMAP_DEFAULT(s) win32mmap(s)
|
|
|
+#define MUNMAP_DEFAULT(a, s) win32munmap((a), (s))
|
|
|
+#define DIRECT_MMAP_DEFAULT(s) win32direct_mmap(s)
|
|
|
+#endif /* WIN32 */
|
|
|
+#endif /* HAVE_MMAP */
|
|
|
+
|
|
|
+#if HAVE_MREMAP
|
|
|
+#ifndef WIN32
|
|
|
+#define MREMAP_DEFAULT(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv))
|
|
|
+#endif /* WIN32 */
|
|
|
+#endif /* HAVE_MREMAP */
|
|
|
+
|
|
|
+
|
|
|
+/**
|
|
|
+ * Define CALL_MORECORE
|
|
|
+ */
|
|
|
+#if HAVE_MORECORE
|
|
|
+ #ifdef MORECORE
|
|
|
+ #define CALL_MORECORE(S) MORECORE(S)
|
|
|
+ #else /* MORECORE */
|
|
|
+ #define CALL_MORECORE(S) MORECORE_DEFAULT(S)
|
|
|
+ #endif /* MORECORE */
|
|
|
+#else /* HAVE_MORECORE */
|
|
|
+ #define CALL_MORECORE(S) MFAIL
|
|
|
+#endif /* HAVE_MORECORE */
|
|
|
+
|
|
|
+/**
|
|
|
+ * Define CALL_MMAP/CALL_MUNMAP/CALL_DIRECT_MMAP
|
|
|
+ */
|
|
|
+#if HAVE_MMAP
|
|
|
+ #define USE_MMAP_BIT (SIZE_T_ONE)
|
|
|
+
|
|
|
+ #ifdef MMAP
|
|
|
+ #define CALL_MMAP(s) MMAP(s)
|
|
|
+ #else /* MMAP */
|
|
|
+ #define CALL_MMAP(s) MMAP_DEFAULT(s)
|
|
|
+ #endif /* MMAP */
|
|
|
+ #ifdef MUNMAP
|
|
|
+ #define CALL_MUNMAP(a, s) MUNMAP((a), (s))
|
|
|
+ #else /* MUNMAP */
|
|
|
+ #define CALL_MUNMAP(a, s) MUNMAP_DEFAULT((a), (s))
|
|
|
+ #endif /* MUNMAP */
|
|
|
+ #ifdef DIRECT_MMAP
|
|
|
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)
|
|
|
+ #else /* DIRECT_MMAP */
|
|
|
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP_DEFAULT(s)
|
|
|
+ #endif /* DIRECT_MMAP */
|
|
|
+#else /* HAVE_MMAP */
|
|
|
+ #define USE_MMAP_BIT (SIZE_T_ZERO)
|
|
|
+
|
|
|
+ #define MMAP(s) MFAIL
|
|
|
+ #define MUNMAP(a, s) (-1)
|
|
|
+ #define DIRECT_MMAP(s) MFAIL
|
|
|
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)
|
|
|
+ #define CALL_MMAP(s) MMAP(s)
|
|
|
+ #define CALL_MUNMAP(a, s) MUNMAP((a), (s))
|
|
|
+#endif /* HAVE_MMAP */
|
|
|
+
|
|
|
+/**
|
|
|
+ * Define CALL_MREMAP
|
|
|
+ */
|
|
|
+#if HAVE_MMAP && HAVE_MREMAP
|
|
|
+ #ifdef MREMAP
|
|
|
+ #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP((addr), (osz), (nsz), (mv))
|
|
|
+ #else /* MREMAP */
|
|
|
+ #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP_DEFAULT((addr), (osz), (nsz), (mv))
|
|
|
+ #endif /* MREMAP */
|
|
|
+#else /* HAVE_MMAP && HAVE_MREMAP */
|
|
|
+ #define CALL_MREMAP(addr, osz, nsz, mv) MFAIL
|
|
|
+#endif /* HAVE_MMAP && HAVE_MREMAP */
|
|
|
+
|
|
|
+/* mstate bit set if continguous morecore disabled or failed */
|
|
|
+#define USE_NONCONTIGUOUS_BIT (4U)
|
|
|
+
|
|
|
+/* segment bit set in create_mspace_with_base */
|
|
|
+#define EXTERN_BIT (8U)
|
|
|
+
|
|
|
+
|
|
|
+/* --------------------------- Lock preliminaries ------------------------ */
|
|
|
+
|
|
|
+/*
|
|
|
+ When locks are defined, there is one global lock, plus
|
|
|
+ one per-mspace lock.
|
|
|
+
|
|
|
+ The global lock_ensures that mparams.magic and other unique
|
|
|
+ mparams values are initialized only once. It also protects
|
|
|
+ sequences of calls to MORECORE. In many cases sys_alloc requires
|
|
|
+ two calls, that should not be interleaved with calls by other
|
|
|
+ threads. This does not protect against direct calls to MORECORE
|
|
|
+ by other threads not using this lock, so there is still code to
|
|
|
+ cope the best we can on interference.
|
|
|
+
|
|
|
+ Per-mspace locks surround calls to malloc, free, etc. To enable use
|
|
|
+ in layered extensions, per-mspace locks are reentrant.
|
|
|
+
|
|
|
+ Because lock-protected regions generally have bounded times, it is
|
|
|
+ OK to use the supplied simple spinlocks in the custom versions for
|
|
|
+ x86. Spinlocks are likely to improve performance for lightly
|
|
|
+ contended applications, but worsen performance under heavy
|
|
|
+ contention.
|
|
|
+
|
|
|
+ If USE_LOCKS is > 1, the definitions of lock routines here are
|
|
|
+ bypassed, in which case you will need to define the type MLOCK_T,
|
|
|
+ and at least INITIAL_LOCK, ACQUIRE_LOCK, RELEASE_LOCK and possibly
|
|
|
+ TRY_LOCK (which is not used in this malloc, but commonly needed in
|
|
|
+ extensions.) You must also declare a
|
|
|
+ static MLOCK_T malloc_global_mutex = { initialization values };.
|
|
|
+
|
|
|
+*/
|
|
|
+
|
|
|
+#if USE_LOCKS == 1
|
|
|
+
|
|
|
+#if USE_SPIN_LOCKS && SPIN_LOCKS_AVAILABLE
|
|
|
+#ifndef WIN32
|
|
|
+
|
|
|
+/* Custom pthread-style spin locks on x86 and x64 for gcc */
|
|
|
+struct pthread_mlock_t {
|
|
|
+ volatile unsigned int l;
|
|
|
+ char cachelinepadding[64];
|
|
|
+ unsigned int c;
|
|
|
+ pthread_t threadid;
|
|
|
+};
|
|
|
+#define MLOCK_T struct pthread_mlock_t
|
|
|
+#define CURRENT_THREAD pthread_self()
|
|
|
+#define INITIAL_LOCK(sl) ((sl)->threadid = 0, (sl)->l = (sl)->c = 0, 0)
|
|
|
+#define ACQUIRE_LOCK(sl) pthread_acquire_lock(sl)
|
|
|
+#define RELEASE_LOCK(sl) pthread_release_lock(sl)
|
|
|
+#define TRY_LOCK(sl) pthread_try_lock(sl)
|
|
|
+#define SPINS_PER_YIELD 63
|
|
|
+
|
|
|
+static MLOCK_T malloc_global_mutex = { 0, "", 0, 0};
|
|
|
+
|
|
|
+static FORCEINLINE int pthread_acquire_lock (MLOCK_T *sl) {
|
|
|
+ int spins = 0;
|
|
|
+ volatile unsigned int* lp = &sl->l;
|
|
|
+ for (;;) {
|
|
|
+ if (*lp != 0) {
|
|
|
+ if (sl->threadid == CURRENT_THREAD) {
|
|
|
+ ++sl->c;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ /* place args to cmpxchgl in locals to evade oddities in some gccs */
|
|
|
+ int cmp = 0;
|
|
|
+ int val = 1;
|
|
|
+ int ret;
|
|
|
+ __asm__ __volatile__ ("lock; cmpxchgl %1, %2"
|
|
|
+ : "=a" (ret)
|
|
|
+ : "r" (val), "m" (*(lp)), "0"(cmp)
|
|
|
+ : "memory", "cc");
|
|
|
+ if (!ret) {
|
|
|
+ assert(!sl->threadid);
|
|
|
+ sl->threadid = CURRENT_THREAD;
|
|
|
+ sl->c = 1;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if ((++spins & SPINS_PER_YIELD) == 0) {
|
|
|
+#if defined (__SVR4) && defined (__sun) /* solaris */
|
|
|
+ thr_yield();
|
|
|
+#else
|
|
|
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
|
|
|
+ sched_yield();
|
|
|
+#else /* no-op yield on unknown systems */
|
|
|
+ ;
|
|
|
+#endif /* __linux__ || __FreeBSD__ || __APPLE__ */
|
|
|
+#endif /* solaris */
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static FORCEINLINE void pthread_release_lock (MLOCK_T *sl) {
|
|
|
+ volatile unsigned int* lp = &sl->l;
|
|
|
+ assert(*lp != 0);
|
|
|
+ assert(sl->threadid == CURRENT_THREAD);
|
|
|
+ if (--sl->c == 0) {
|
|
|
+ sl->threadid = 0;
|
|
|
+ int prev = 0;
|
|
|
+ int ret;
|
|
|
+ __asm__ __volatile__ ("lock; xchgl %0, %1"
|
|
|
+ : "=r" (ret)
|
|
|
+ : "m" (*(lp)), "0"(prev)
|
|
|
+ : "memory");
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static FORCEINLINE int pthread_try_lock (MLOCK_T *sl) {
|
|
|
+ volatile unsigned int* lp = &sl->l;
|
|
|
+ if (*lp != 0) {
|
|
|
+ if (sl->threadid == CURRENT_THREAD) {
|
|
|
+ ++sl->c;
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ int cmp = 0;
|
|
|
+ int val = 1;
|
|
|
+ int ret;
|
|
|
+ __asm__ __volatile__ ("lock; cmpxchgl %1, %2"
|
|
|
+ : "=a" (ret)
|
|
|
+ : "r" (val), "m" (*(lp)), "0"(cmp)
|
|
|
+ : "memory", "cc");
|
|
|
+ if (!ret) {
|
|
|
+ assert(!sl->threadid);
|
|
|
+ sl->threadid = CURRENT_THREAD;
|
|
|
+ sl->c = 1;
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+#else /* WIN32 */
|
|
|
+/* Custom win32-style spin locks on x86 and x64 for MSC */
|
|
|
+struct win32_mlock_t {
|
|
|
+ volatile long l;
|
|
|
+ char cachelinepadding[64];
|
|
|
+ unsigned int c;
|
|
|
+ long threadid;
|
|
|
+};
|
|
|
+
|
|
|
+#define MLOCK_T struct win32_mlock_t
|
|
|
+#define CURRENT_THREAD ((long)GetCurrentThreadId())
|
|
|
+#define INITIAL_LOCK(sl) ((sl)->threadid = 0, (sl)->l = (sl)->c = 0, 0)
|
|
|
+#define ACQUIRE_LOCK(sl) win32_acquire_lock(sl)
|
|
|
+#define RELEASE_LOCK(sl) win32_release_lock(sl)
|
|
|
+#define TRY_LOCK(sl) win32_try_lock(sl)
|
|
|
+#define SPINS_PER_YIELD 63
|
|
|
+
|
|
|
+static MLOCK_T malloc_global_mutex = { 0, 0, 0};
|
|
|
+
|
|
|
+static FORCEINLINE int win32_acquire_lock (MLOCK_T *sl) {
|
|
|
+ int spins = 0;
|
|
|
+ for (;;) {
|
|
|
+ if (sl->l != 0) {
|
|
|
+ if (sl->threadid == CURRENT_THREAD) {
|
|
|
+ ++sl->c;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ if (!interlockedexchange(&sl->l, 1)) {
|
|
|
+ assert(!sl->threadid);
|
|
|
+ sl->threadid = CURRENT_THREAD;
|
|
|
+ sl->c = 1;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if ((++spins & SPINS_PER_YIELD) == 0)
|
|
|
+ SleepEx(0, FALSE);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static FORCEINLINE void win32_release_lock (MLOCK_T *sl) {
|
|
|
+ assert(sl->threadid == CURRENT_THREAD);
|
|
|
+ assert(sl->l != 0);
|
|
|
+ if (--sl->c == 0) {
|
|
|
+ sl->threadid = 0;
|
|
|
+ interlockedexchange (&sl->l, 0);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static FORCEINLINE int win32_try_lock (MLOCK_T *sl) {
|
|
|
+ if (sl->l != 0) {
|
|
|
+ if (sl->threadid == CURRENT_THREAD) {
|
|
|
+ ++sl->c;
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ if (!interlockedexchange(&sl->l, 1)){
|
|
|
+ assert(!sl->threadid);
|
|
|
+ sl->threadid = CURRENT_THREAD;
|
|
|
+ sl->c = 1;
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+#endif /* WIN32 */
|
|
|
+#else /* USE_SPIN_LOCKS */
|
|
|
+
|
|
|
+#ifndef WIN32
|
|
|
+/* pthreads-based locks */
|
|
|
+
|
|
|
+#define MLOCK_T pthread_mutex_t
|
|
|
+#define CURRENT_THREAD pthread_self()
|
|
|
+#define INITIAL_LOCK(sl) pthread_init_lock(sl)
|
|
|
+#define ACQUIRE_LOCK(sl) pthread_mutex_lock(sl)
|
|
|
+#define RELEASE_LOCK(sl) pthread_mutex_unlock(sl)
|
|
|
+#define TRY_LOCK(sl) (!pthread_mutex_trylock(sl))
|
|
|
+
|
|
|
+static MLOCK_T malloc_global_mutex = PTHREAD_MUTEX_INITIALIZER;
|
|
|
+
|
|
|
+/* Cope with old-style linux recursive lock initialization by adding */
|
|
|
+/* skipped internal declaration from pthread.h */
|
|
|
+#ifdef linux
|
|
|
+#ifndef PTHREAD_MUTEX_RECURSIVE
|
|
|
+extern int pthread_mutexattr_setkind_np __P ((pthread_mutexattr_t *__attr,
|
|
|
+ int __kind));
|
|
|
+#define PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
|
|
|
+#define pthread_mutexattr_settype(x,y) pthread_mutexattr_setkind_np(x,y)
|
|
|
+#endif
|
|
|
+#endif
|
|
|
+
|
|
|
+static int pthread_init_lock (MLOCK_T *sl) {
|
|
|
+ pthread_mutexattr_t attr;
|
|
|
+ if (pthread_mutexattr_init(&attr)) return 1;
|
|
|
+ if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE)) return 1;
|
|
|
+ if (pthread_mutex_init(sl, &attr)) return 1;
|
|
|
+ if (pthread_mutexattr_destroy(&attr)) return 1;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+#else /* WIN32 */
|
|
|
+/* Win32 critical sections */
|
|
|
+#define MLOCK_T CRITICAL_SECTION
|
|
|
+#define CURRENT_THREAD GetCurrentThreadId()
|
|
|
+#define INITIAL_LOCK(s) (!InitializeCriticalSectionAndSpinCount((s), 0x80000000|4000))
|
|
|
+#define ACQUIRE_LOCK(s) (EnterCriticalSection(sl), 0)
|
|
|
+#define RELEASE_LOCK(s) LeaveCriticalSection(sl)
|
|
|
+#define TRY_LOCK(s) TryEnterCriticalSection(sl)
|
|
|
+#define NEED_GLOBAL_LOCK_INIT
|
|
|
+
|
|
|
+static MLOCK_T malloc_global_mutex;
|
|
|
+static volatile long malloc_global_mutex_status;
|
|
|
+
|
|
|
+/* Use spin loop to initialize global lock */
|
|
|
+static void init_malloc_global_mutex() {
|
|
|
+ for (;;) {
|
|
|
+ long stat = malloc_global_mutex_status;
|
|
|
+ if (stat > 0)
|
|
|
+ return;
|
|
|
+ /* transition to < 0 while initializing, then to > 0) */
|
|
|
+ if (stat == 0 &&
|
|
|
+ interlockedcompareexchange(&malloc_global_mutex_status, -1, 0) == 0) {
|
|
|
+ InitializeCriticalSection(&malloc_global_mutex);
|
|
|
+ interlockedexchange(&malloc_global_mutex_status,1);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ SleepEx(0, FALSE);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+#endif /* WIN32 */
|
|
|
+#endif /* USE_SPIN_LOCKS */
|
|
|
+#endif /* USE_LOCKS == 1 */
|
|
|
+
|
|
|
+/* ----------------------- User-defined locks ------------------------ */
|
|
|
+
|
|
|
+#if USE_LOCKS > 1
|
|
|
+/* Define your own lock implementation here */
|
|
|
+/* #define INITIAL_LOCK(sl) ... */
|
|
|
+/* #define ACQUIRE_LOCK(sl) ... */
|
|
|
+/* #define RELEASE_LOCK(sl) ... */
|
|
|
+/* #define TRY_LOCK(sl) ... */
|
|
|
+/* static MLOCK_T malloc_global_mutex = ... */
|
|
|
+#endif /* USE_LOCKS > 1 */
|
|
|
+
|
|
|
+/* ----------------------- Lock-based state ------------------------ */
|
|
|
+
|
|
|
+#if USE_LOCKS
|
|
|
+#define USE_LOCK_BIT (2U)
|
|
|
+#else /* USE_LOCKS */
|
|
|
+#define USE_LOCK_BIT (0U)
|
|
|
+#define INITIAL_LOCK(l)
|
|
|
+#endif /* USE_LOCKS */
|
|
|
+
|
|
|
+#if USE_LOCKS
|
|
|
+#ifndef ACQUIRE_MALLOC_GLOBAL_LOCK
|
|
|
+#define ACQUIRE_MALLOC_GLOBAL_LOCK() ACQUIRE_LOCK(&malloc_global_mutex);
|
|
|
+#endif
|
|
|
+#ifndef RELEASE_MALLOC_GLOBAL_LOCK
|
|
|
+#define RELEASE_MALLOC_GLOBAL_LOCK() RELEASE_LOCK(&malloc_global_mutex);
|
|
|
+#endif
|
|
|
+#else /* USE_LOCKS */
|
|
|
+#define ACQUIRE_MALLOC_GLOBAL_LOCK()
|
|
|
+#define RELEASE_MALLOC_GLOBAL_LOCK()
|
|
|
+#endif /* USE_LOCKS */
|
|
|
+
|
|
|
+
|
|
|
+/* ----------------------- Chunk representations ------------------------ */
|
|
|
+
|
|
|
+/*
|
|
|
+ (The following includes lightly edited explanations by Colin Plumb.)
|
|
|
+
|
|
|
+ The malloc_chunk declaration below is misleading (but accurate and
|
|
|
+ necessary). It declares a "view" into memory allowing access to
|
|
|
+ necessary fields at known offsets from a given base.
|
|
|
+
|
|
|
+ Chunks of memory are maintained using a `boundary tag' method as
|
|
|
+ originally described by Knuth. (See the paper by Paul Wilson
|
|
|
+ ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a survey of such
|
|
|
+ techniques.) Sizes of free chunks are stored both in the front of
|
|
|
+ each chunk and at the end. This makes consolidating fragmented
|
|
|
+ chunks into bigger chunks fast. The head fields also hold bits
|
|
|
+ representing whether chunks are free or in use.
|
|
|
+
|
|
|
+ Here are some pictures to make it clearer. They are "exploded" to
|
|
|
+ show that the state of a chunk can be thought of as extending from
|
|
|
+ the high 31 bits of the head field of its header through the
|
|
|
+ prev_foot and PINUSE_BIT bit of the following chunk header.
|
|
|
+
|
|
|
+ A chunk that's in use looks like:
|
|
|
+
|
|
|
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Size of previous chunk (if P = 0) |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
|
|
|
+ | Size of this chunk 1| +-+
|
|
|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | |
|
|
|
+ +- -+
|
|
|
+ | |
|
|
|
+ +- -+
|
|
|
+ | :
|
|
|
+ +- size - sizeof(size_t) available payload bytes -+
|
|
|
+ : |
|
|
|
+ chunk-> +- -+
|
|
|
+ | |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|
|
|
|
+ | Size of next chunk (may or may not be in use) | +-+
|
|
|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+
|
|
|
+ And if it's free, it looks like this:
|
|
|
+
|
|
|
+ chunk-> +- -+
|
|
|
+ | User payload (must be in use, or we would have merged!) |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
|
|
|
+ | Size of this chunk 0| +-+
|
|
|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Next pointer |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Prev pointer |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | :
|
|
|
+ +- size - sizeof(struct chunk) unused bytes -+
|
|
|
+ : |
|
|
|
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Size of this chunk |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|
|
|
|
+ | Size of next chunk (must be in use, or we would have merged)| +-+
|
|
|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | :
|
|
|
+ +- User payload -+
|
|
|
+ : |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ |0|
|
|
|
+ +-+
|
|
|
+ Note that since we always merge adjacent free chunks, the chunks
|
|
|
+ adjacent to a free chunk must be in use.
|
|
|
+
|
|
|
+ Given a pointer to a chunk (which can be derived trivially from the
|
|
|
+ payload pointer) we can, in O(1) time, find out whether the adjacent
|
|
|
+ chunks are free, and if so, unlink them from the lists that they
|
|
|
+ are on and merge them with the current chunk.
|
|
|
+
|
|
|
+ Chunks always begin on even word boundaries, so the mem portion
|
|
|
+ (which is returned to the user) is also on an even word boundary, and
|
|
|
+ thus at least double-word aligned.
|
|
|
+
|
|
|
+ The P (PINUSE_BIT) bit, stored in the unused low-order bit of the
|
|
|
+ chunk size (which is always a multiple of two words), is an in-use
|
|
|
+ bit for the *previous* chunk. If that bit is *clear*, then the
|
|
|
+ word before the current chunk size contains the previous chunk
|
|
|
+ size, and can be used to find the front of the previous chunk.
|
|
|
+ The very first chunk allocated always has this bit set, preventing
|
|
|
+ access to non-existent (or non-owned) memory. If pinuse is set for
|
|
|
+ any given chunk, then you CANNOT determine the size of the
|
|
|
+ previous chunk, and might even get a memory addressing fault when
|
|
|
+ trying to do so.
|
|
|
+
|
|
|
+ The C (CINUSE_BIT) bit, stored in the unused second-lowest bit of
|
|
|
+ the chunk size redundantly records whether the current chunk is
|
|
|
+ inuse (unless the chunk is mmapped). This redundancy enables usage
|
|
|
+ checks within free and realloc, and reduces indirection when freeing
|
|
|
+ and consolidating chunks.
|
|
|
+
|
|
|
+ Each freshly allocated chunk must have both cinuse and pinuse set.
|
|
|
+ That is, each allocated chunk borders either a previously allocated
|
|
|
+ and still in-use chunk, or the base of its memory arena. This is
|
|
|
+ ensured by making all allocations from the the `lowest' part of any
|
|
|
+ found chunk. Further, no free chunk physically borders another one,
|
|
|
+ so each free chunk is known to be preceded and followed by either
|
|
|
+ inuse chunks or the ends of memory.
|
|
|
+
|
|
|
+ Note that the `foot' of the current chunk is actually represented
|
|
|
+ as the prev_foot of the NEXT chunk. This makes it easier to
|
|
|
+ deal with alignments etc but can be very confusing when trying
|
|
|
+ to extend or adapt this code.
|
|
|
+
|
|
|
+ The exceptions to all this are
|
|
|
+
|
|
|
+ 1. The special chunk `top' is the top-most available chunk (i.e.,
|
|
|
+ the one bordering the end of available memory). It is treated
|
|
|
+ specially. Top is never included in any bin, is used only if
|
|
|
+ no other chunk is available, and is released back to the
|
|
|
+ system if it is very large (see M_TRIM_THRESHOLD). In effect,
|
|
|
+ the top chunk is treated as larger (and thus less well
|
|
|
+ fitting) than any other available chunk. The top chunk
|
|
|
+ doesn't update its trailing size field since there is no next
|
|
|
+ contiguous chunk that would have to index off it. However,
|
|
|
+ space is still allocated for it (TOP_FOOT_SIZE) to enable
|
|
|
+ separation or merging when space is extended.
|
|
|
+
|
|
|
+ 3. Chunks allocated via mmap, have both cinuse and pinuse bits
|
|
|
+ cleared in their head fields. Because they are allocated
|
|
|
+ one-by-one, each must carry its own prev_foot field, which is
|
|
|
+ also used to hold the offset this chunk has within its mmapped
|
|
|
+ region, which is needed to preserve alignment. Each mmapped
|
|
|
+ chunk is trailed by the first two fields of a fake next-chunk
|
|
|
+ for sake of usage checks.
|
|
|
+
|
|
|
+*/
|
|
|
+
|
|
|
+struct malloc_chunk {
|
|
|
+ size_t prev_foot; /* Size of previous chunk (if free). */
|
|
|
+ size_t head; /* Size and inuse bits. */
|
|
|
+ struct malloc_chunk* fd; /* double links -- used only if free. */
|
|
|
+ struct malloc_chunk* bk;
|
|
|
+};
|
|
|
+
|
|
|
+typedef struct malloc_chunk mchunk;
|
|
|
+typedef struct malloc_chunk* mchunkptr;
|
|
|
+typedef struct malloc_chunk* sbinptr; /* The type of bins of chunks */
|
|
|
+typedef unsigned int bindex_t; /* Described below */
|
|
|
+typedef unsigned int binmap_t; /* Described below */
|
|
|
+
|
|
|
+/* ------------------- Chunks sizes and alignments ----------------------- */
|
|
|
+
|
|
|
+#define MCHUNK_SIZE (sizeof(mchunk))
|
|
|
+
|
|
|
+#if FOOTERS
|
|
|
+#define CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
|
|
|
+#else /* FOOTERS */
|
|
|
+#define CHUNK_OVERHEAD (SIZE_T_SIZE)
|
|
|
+#endif /* FOOTERS */
|
|
|
+
|
|
|
+/* MMapped chunks need a second word of overhead ... */
|
|
|
+#define MMAP_CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
|
|
|
+/* ... and additional padding for fake next-chunk at foot */
|
|
|
+#define MMAP_FOOT_PAD (FOUR_SIZE_T_SIZES)
|
|
|
+
|
|
|
+/* The smallest size we can malloc is an aligned minimal chunk */
|
|
|
+#define MIN_CHUNK_SIZE\
|
|
|
+ ((MCHUNK_SIZE + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
|
|
|
+
|
|
|
+/* conversion from malloc headers to user pointers, and back */
|
|
|
+#define chunk2mem(p) ((void*)((char*)(p) + TWO_SIZE_T_SIZES))
|
|
|
+#define mem2chunk(mem) ((mchunkptr)((char*)(mem) - TWO_SIZE_T_SIZES))
|
|
|
+/* chunk associated with aligned address A */
|
|
|
+#define align_as_chunk(A) (mchunkptr)((A) + align_offset(chunk2mem(A)))
|
|
|
+
|
|
|
+/* Bounds on request (not chunk) sizes. */
|
|
|
+#define MAX_REQUEST ((-MIN_CHUNK_SIZE) << 2)
|
|
|
+#define MIN_REQUEST (MIN_CHUNK_SIZE - CHUNK_OVERHEAD - SIZE_T_ONE)
|
|
|
+
|
|
|
+/* pad request bytes into a usable size */
|
|
|
+#define pad_request(req) \
|
|
|
+ (((req) + CHUNK_OVERHEAD + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
|
|
|
+
|
|
|
+/* pad request, checking for minimum (but not maximum) */
|
|
|
+#define request2size(req) \
|
|
|
+ (((req) < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(req))
|
|
|
+
|
|
|
+
|
|
|
+/* ------------------ Operations on head and foot fields ----------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ The head field of a chunk is or'ed with PINUSE_BIT when previous
|
|
|
+ adjacent chunk in use, and or'ed with CINUSE_BIT if this chunk is in
|
|
|
+ use, unless mmapped, in which case both bits are cleared.
|
|
|
+
|
|
|
+ FLAG4_BIT is not used by this malloc, but might be useful in extensions.
|
|
|
+*/
|
|
|
+
|
|
|
+#define PINUSE_BIT (SIZE_T_ONE)
|
|
|
+#define CINUSE_BIT (SIZE_T_TWO)
|
|
|
+#define FLAG4_BIT (SIZE_T_FOUR)
|
|
|
+#define INUSE_BITS (PINUSE_BIT|CINUSE_BIT)
|
|
|
+#define FLAG_BITS (PINUSE_BIT|CINUSE_BIT|FLAG4_BIT)
|
|
|
+
|
|
|
+/* Head value for fenceposts */
|
|
|
+#define FENCEPOST_HEAD (INUSE_BITS|SIZE_T_SIZE)
|
|
|
+
|
|
|
+/* extraction of fields from head words */
|
|
|
+#define cinuse(p) ((p)->head & CINUSE_BIT)
|
|
|
+#define pinuse(p) ((p)->head & PINUSE_BIT)
|
|
|
+#define is_inuse(p) (((p)->head & INUSE_BITS) != PINUSE_BIT)
|
|
|
+#define is_mmapped(p) (((p)->head & INUSE_BITS) == 0)
|
|
|
+
|
|
|
+#define chunksize(p) ((p)->head & ~(FLAG_BITS))
|
|
|
+
|
|
|
+#define clear_pinuse(p) ((p)->head &= ~PINUSE_BIT)
|
|
|
+
|
|
|
+/* Treat space at ptr +/- offset as a chunk */
|
|
|
+#define chunk_plus_offset(p, s) ((mchunkptr)(((char*)(p)) + (s)))
|
|
|
+#define chunk_minus_offset(p, s) ((mchunkptr)(((char*)(p)) - (s)))
|
|
|
+
|
|
|
+/* Ptr to next or previous physical malloc_chunk. */
|
|
|
+#define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->head & ~FLAG_BITS)))
|
|
|
+#define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) ))
|
|
|
+
|
|
|
+/* extract next chunk's pinuse bit */
|
|
|
+#define next_pinuse(p) ((next_chunk(p)->head) & PINUSE_BIT)
|
|
|
+
|
|
|
+/* Get/set size at footer */
|
|
|
+#define get_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot)
|
|
|
+#define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s))
|
|
|
+
|
|
|
+/* Set size, pinuse bit, and foot */
|
|
|
+#define set_size_and_pinuse_of_free_chunk(p, s)\
|
|
|
+ ((p)->head = (s|PINUSE_BIT), set_foot(p, s))
|
|
|
+
|
|
|
+/* Set size, pinuse bit, foot, and clear next pinuse */
|
|
|
+#define set_free_with_pinuse(p, s, n)\
|
|
|
+ (clear_pinuse(n), set_size_and_pinuse_of_free_chunk(p, s))
|
|
|
+
|
|
|
+/* Get the internal overhead associated with chunk p */
|
|
|
+#define overhead_for(p)\
|
|
|
+ (is_mmapped(p)? MMAP_CHUNK_OVERHEAD : CHUNK_OVERHEAD)
|
|
|
+
|
|
|
+/* Return true if malloced space is not necessarily cleared */
|
|
|
+#if MMAP_CLEARS
|
|
|
+#define calloc_must_clear(p) (!is_mmapped(p))
|
|
|
+#else /* MMAP_CLEARS */
|
|
|
+#define calloc_must_clear(p) (1)
|
|
|
+#endif /* MMAP_CLEARS */
|
|
|
+
|
|
|
+/* ---------------------- Overlaid data structures ----------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ When chunks are not in use, they are treated as nodes of either
|
|
|
+ lists or trees.
|
|
|
+
|
|
|
+ "Small" chunks are stored in circular doubly-linked lists, and look
|
|
|
+ like this:
|
|
|
+
|
|
|
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Size of previous chunk |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ `head:' | Size of chunk, in bytes |P|
|
|
|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Forward pointer to next chunk in list |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Back pointer to previous chunk in list |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Unused space (may be 0 bytes long) .
|
|
|
+ . .
|
|
|
+ . |
|
|
|
+nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ `foot:' | Size of chunk, in bytes |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+
|
|
|
+ Larger chunks are kept in a form of bitwise digital trees (aka
|
|
|
+ tries) keyed on chunksizes. Because malloc_tree_chunks are only for
|
|
|
+ free chunks greater than 256 bytes, their size doesn't impose any
|
|
|
+ constraints on user chunk sizes. Each node looks like:
|
|
|
+
|
|
|
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Size of previous chunk |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ `head:' | Size of chunk, in bytes |P|
|
|
|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Forward pointer to next chunk of same size |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Back pointer to previous chunk of same size |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Pointer to left child (child[0]) |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Pointer to right child (child[1]) |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Pointer to parent |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | bin index of this chunk |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ | Unused space .
|
|
|
+ . |
|
|
|
+nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+ `foot:' | Size of chunk, in bytes |
|
|
|
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
+
|
|
|
+ Each tree holding treenodes is a tree of unique chunk sizes. Chunks
|
|
|
+ of the same size are arranged in a circularly-linked list, with only
|
|
|
+ the oldest chunk (the next to be used, in our FIFO ordering)
|
|
|
+ actually in the tree. (Tree members are distinguished by a non-null
|
|
|
+ parent pointer.) If a chunk with the same size an an existing node
|
|
|
+ is inserted, it is linked off the existing node using pointers that
|
|
|
+ work in the same way as fd/bk pointers of small chunks.
|
|
|
+
|
|
|
+ Each tree contains a power of 2 sized range of chunk sizes (the
|
|
|
+ smallest is 0x100 <= x < 0x180), which is is divided in half at each
|
|
|
+ tree level, with the chunks in the smaller half of the range (0x100
|
|
|
+ <= x < 0x140 for the top nose) in the left subtree and the larger
|
|
|
+ half (0x140 <= x < 0x180) in the right subtree. This is, of course,
|
|
|
+ done by inspecting individual bits.
|
|
|
+
|
|
|
+ Using these rules, each node's left subtree contains all smaller
|
|
|
+ sizes than its right subtree. However, the node at the root of each
|
|
|
+ subtree has no particular ordering relationship to either. (The
|
|
|
+ dividing line between the subtree sizes is based on trie relation.)
|
|
|
+ If we remove the last chunk of a given size from the interior of the
|
|
|
+ tree, we need to replace it with a leaf node. The tree ordering
|
|
|
+ rules permit a node to be replaced by any leaf below it.
|
|
|
+
|
|
|
+ The smallest chunk in a tree (a common operation in a best-fit
|
|
|
+ allocator) can be found by walking a path to the leftmost leaf in
|
|
|
+ the tree. Unlike a usual binary tree, where we follow left child
|
|
|
+ pointers until we reach a null, here we follow the right child
|
|
|
+ pointer any time the left one is null, until we reach a leaf with
|
|
|
+ both child pointers null. The smallest chunk in the tree will be
|
|
|
+ somewhere along that path.
|
|
|
+
|
|
|
+ The worst case number of steps to add, find, or remove a node is
|
|
|
+ bounded by the number of bits differentiating chunks within
|
|
|
+ bins. Under current bin calculations, this ranges from 6 up to 21
|
|
|
+ (for 32 bit sizes) or up to 53 (for 64 bit sizes). The typical case
|
|
|
+ is of course much better.
|
|
|
+*/
|
|
|
+
|
|
|
+struct malloc_tree_chunk {
|
|
|
+ /* The first four fields must be compatible with malloc_chunk */
|
|
|
+ size_t prev_foot;
|
|
|
+ size_t head;
|
|
|
+ struct malloc_tree_chunk* fd;
|
|
|
+ struct malloc_tree_chunk* bk;
|
|
|
+
|
|
|
+ struct malloc_tree_chunk* child[2];
|
|
|
+ struct malloc_tree_chunk* parent;
|
|
|
+ bindex_t index;
|
|
|
+};
|
|
|
+
|
|
|
+typedef struct malloc_tree_chunk tchunk;
|
|
|
+typedef struct malloc_tree_chunk* tchunkptr;
|
|
|
+typedef struct malloc_tree_chunk* tbinptr; /* The type of bins of trees */
|
|
|
+
|
|
|
+/* A little helper macro for trees */
|
|
|
+#define leftmost_child(t) ((t)->child[0] != 0? (t)->child[0] : (t)->child[1])
|
|
|
+
|
|
|
+/* ----------------------------- Segments -------------------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ Each malloc space may include non-contiguous segments, held in a
|
|
|
+ list headed by an embedded malloc_segment record representing the
|
|
|
+ top-most space. Segments also include flags holding properties of
|
|
|
+ the space. Large chunks that are directly allocated by mmap are not
|
|
|
+ included in this list. They are instead independently created and
|
|
|
+ destroyed without otherwise keeping track of them.
|
|
|
+
|
|
|
+ Segment management mainly comes into play for spaces allocated by
|
|
|
+ MMAP. Any call to MMAP might or might not return memory that is
|
|
|
+ adjacent to an existing segment. MORECORE normally contiguously
|
|
|
+ extends the current space, so this space is almost always adjacent,
|
|
|
+ which is simpler and faster to deal with. (This is why MORECORE is
|
|
|
+ used preferentially to MMAP when both are available -- see
|
|
|
+ sys_alloc.) When allocating using MMAP, we don't use any of the
|
|
|
+ hinting mechanisms (inconsistently) supported in various
|
|
|
+ implementations of unix mmap, or distinguish reserving from
|
|
|
+ committing memory. Instead, we just ask for space, and exploit
|
|
|
+ contiguity when we get it. It is probably possible to do
|
|
|
+ better than this on some systems, but no general scheme seems
|
|
|
+ to be significantly better.
|
|
|
+
|
|
|
+ Management entails a simpler variant of the consolidation scheme
|
|
|
+ used for chunks to reduce fragmentation -- new adjacent memory is
|
|
|
+ normally prepended or appended to an existing segment. However,
|
|
|
+ there are limitations compared to chunk consolidation that mostly
|
|
|
+ reflect the fact that segment processing is relatively infrequent
|
|
|
+ (occurring only when getting memory from system) and that we
|
|
|
+ don't expect to have huge numbers of segments:
|
|
|
+
|
|
|
+ * Segments are not indexed, so traversal requires linear scans. (It
|
|
|
+ would be possible to index these, but is not worth the extra
|
|
|
+ overhead and complexity for most programs on most platforms.)
|
|
|
+ * New segments are only appended to old ones when holding top-most
|
|
|
+ memory; if they cannot be prepended to others, they are held in
|
|
|
+ different segments.
|
|
|
+
|
|
|
+ Except for the top-most segment of an mstate, each segment record
|
|
|
+ is kept at the tail of its segment. Segments are added by pushing
|
|
|
+ segment records onto the list headed by &mstate.seg for the
|
|
|
+ containing mstate.
|
|
|
+
|
|
|
+ Segment flags control allocation/merge/deallocation policies:
|
|
|
+ * If EXTERN_BIT set, then we did not allocate this segment,
|
|
|
+ and so should not try to deallocate or merge with others.
|
|
|
+ (This currently holds only for the initial segment passed
|
|
|
+ into create_mspace_with_base.)
|
|
|
+ * If USE_MMAP_BIT set, the segment may be merged with
|
|
|
+ other surrounding mmapped segments and trimmed/de-allocated
|
|
|
+ using munmap.
|
|
|
+ * If neither bit is set, then the segment was obtained using
|
|
|
+ MORECORE so can be merged with surrounding MORECORE'd segments
|
|
|
+ and deallocated/trimmed using MORECORE with negative arguments.
|
|
|
+*/
|
|
|
+
|
|
|
+struct malloc_segment {
|
|
|
+ char* base; /* base address */
|
|
|
+ size_t size; /* allocated size */
|
|
|
+ struct malloc_segment* next; /* ptr to next segment */
|
|
|
+ flag_t sflags; /* mmap and extern flag */
|
|
|
+};
|
|
|
+
|
|
|
+#define is_mmapped_segment(S) ((S)->sflags & USE_MMAP_BIT)
|
|
|
+#define is_extern_segment(S) ((S)->sflags & EXTERN_BIT)
|
|
|
+
|
|
|
+typedef struct malloc_segment msegment;
|
|
|
+typedef struct malloc_segment* msegmentptr;
|
|
|
+
|
|
|
+/* ---------------------------- malloc_state ----------------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ A malloc_state holds all of the bookkeeping for a space.
|
|
|
+ The main fields are:
|
|
|
+
|
|
|
+ Top
|
|
|
+ The topmost chunk of the currently active segment. Its size is
|
|
|
+ cached in topsize. The actual size of topmost space is
|
|
|
+ topsize+TOP_FOOT_SIZE, which includes space reserved for adding
|
|
|
+ fenceposts and segment records if necessary when getting more
|
|
|
+ space from the system. The size at which to autotrim top is
|
|
|
+ cached from mparams in trim_check, except that it is disabled if
|
|
|
+ an autotrim fails.
|
|
|
+
|
|
|
+ Designated victim (dv)
|
|
|
+ This is the preferred chunk for servicing small requests that
|
|
|
+ don't have exact fits. It is normally the chunk split off most
|
|
|
+ recently to service another small request. Its size is cached in
|
|
|
+ dvsize. The link fields of this chunk are not maintained since it
|
|
|
+ is not kept in a bin.
|
|
|
+
|
|
|
+ SmallBins
|
|
|
+ An array of bin headers for free chunks. These bins hold chunks
|
|
|
+ with sizes less than MIN_LARGE_SIZE bytes. Each bin contains
|
|
|
+ chunks of all the same size, spaced 8 bytes apart. To simplify
|
|
|
+ use in double-linked lists, each bin header acts as a malloc_chunk
|
|
|
+ pointing to the real first node, if it exists (else pointing to
|
|
|
+ itself). This avoids special-casing for headers. But to avoid
|
|
|
+ waste, we allocate only the fd/bk pointers of bins, and then use
|
|
|
+ repositioning tricks to treat these as the fields of a chunk.
|
|
|
+
|
|
|
+ TreeBins
|
|
|
+ Treebins are pointers to the roots of trees holding a range of
|
|
|
+ sizes. There are 2 equally spaced treebins for each power of two
|
|
|
+ from TREE_SHIFT to TREE_SHIFT+16. The last bin holds anything
|
|
|
+ larger.
|
|
|
+
|
|
|
+ Bin maps
|
|
|
+ There is one bit map for small bins ("smallmap") and one for
|
|
|
+ treebins ("treemap). Each bin sets its bit when non-empty, and
|
|
|
+ clears the bit when empty. Bit operations are then used to avoid
|
|
|
+ bin-by-bin searching -- nearly all "search" is done without ever
|
|
|
+ looking at bins that won't be selected. The bit maps
|
|
|
+ conservatively use 32 bits per map word, even if on 64bit system.
|
|
|
+ For a good description of some of the bit-based techniques used
|
|
|
+ here, see Henry S. Warren Jr's book "Hacker's Delight" (and
|
|
|
+ supplement at http://hackersdelight.org/). Many of these are
|
|
|
+ intended to reduce the branchiness of paths through malloc etc, as
|
|
|
+ well as to reduce the number of memory locations read or written.
|
|
|
+
|
|
|
+ Segments
|
|
|
+ A list of segments headed by an embedded malloc_segment record
|
|
|
+ representing the initial space.
|
|
|
+
|
|
|
+ Address check support
|
|
|
+ The least_addr field is the least address ever obtained from
|
|
|
+ MORECORE or MMAP. Attempted frees and reallocs of any address less
|
|
|
+ than this are trapped (unless INSECURE is defined).
|
|
|
+
|
|
|
+ Magic tag
|
|
|
+ A cross-check field that should always hold same value as mparams.magic.
|
|
|
+
|
|
|
+ Flags
|
|
|
+ Bits recording whether to use MMAP, locks, or contiguous MORECORE
|
|
|
+
|
|
|
+ Statistics
|
|
|
+ Each space keeps track of current and maximum system memory
|
|
|
+ obtained via MORECORE or MMAP.
|
|
|
+
|
|
|
+ Trim support
|
|
|
+ Fields holding the amount of unused topmost memory that should trigger
|
|
|
+ timming, and a counter to force periodic scanning to release unused
|
|
|
+ non-topmost segments.
|
|
|
+
|
|
|
+ Locking
|
|
|
+ If USE_LOCKS is defined, the "mutex" lock is acquired and released
|
|
|
+ around every public call using this mspace.
|
|
|
+
|
|
|
+ Extension support
|
|
|
+ A void* pointer and a size_t field that can be used to help implement
|
|
|
+ extensions to this malloc.
|
|
|
+*/
|
|
|
+
|
|
|
+/* Bin types, widths and sizes */
|
|
|
+#define NSMALLBINS (32U)
|
|
|
+#define NTREEBINS (32U)
|
|
|
+#define SMALLBIN_SHIFT (3U)
|
|
|
+#define SMALLBIN_WIDTH (SIZE_T_ONE << SMALLBIN_SHIFT)
|
|
|
+#define TREEBIN_SHIFT (8U)
|
|
|
+#define MIN_LARGE_SIZE (SIZE_T_ONE << TREEBIN_SHIFT)
|
|
|
+#define MAX_SMALL_SIZE (MIN_LARGE_SIZE - SIZE_T_ONE)
|
|
|
+#define MAX_SMALL_REQUEST (MAX_SMALL_SIZE - CHUNK_ALIGN_MASK - CHUNK_OVERHEAD)
|
|
|
+
|
|
|
+struct malloc_state {
|
|
|
+ binmap_t smallmap;
|
|
|
+ binmap_t treemap;
|
|
|
+ size_t dvsize;
|
|
|
+ size_t topsize;
|
|
|
+ char* least_addr;
|
|
|
+ mchunkptr dv;
|
|
|
+ mchunkptr top;
|
|
|
+ size_t trim_check;
|
|
|
+ size_t release_checks;
|
|
|
+ size_t magic;
|
|
|
+ mchunkptr smallbins[(NSMALLBINS+1)*2];
|
|
|
+ tbinptr treebins[NTREEBINS];
|
|
|
+ size_t footprint;
|
|
|
+ size_t max_footprint;
|
|
|
+ flag_t mflags;
|
|
|
+ msegment seg;
|
|
|
+#if USE_LOCKS
|
|
|
+ MLOCK_T mutex; /* locate lock among fields that rarely change */
|
|
|
+#endif /* USE_LOCKS */
|
|
|
+ void* extp; /* Unused but available for extensions */
|
|
|
+ size_t exts;
|
|
|
+};
|
|
|
+
|
|
|
+typedef struct malloc_state* mstate;
|
|
|
+
|
|
|
+/* ------------- Global malloc_state and malloc_params ------------------- */
|
|
|
+
|
|
|
+#if !ONLY_MSPACES
|
|
|
+
|
|
|
+/* The global malloc_state used for all non-"mspace" calls */
|
|
|
+static struct malloc_state _gm_;
|
|
|
+#define gm (&_gm_)
|
|
|
+#define is_global(M) ((M) == &_gm_)
|
|
|
+
|
|
|
+#endif /* !ONLY_MSPACES */
|
|
|
+
|
|
|
+#define is_initialized(M) ((M)->top != 0)
|
|
|
+
|
|
|
+/* -------------------------- system alloc setup ------------------------- */
|
|
|
+
|
|
|
+/* Operations on mflags */
|
|
|
+
|
|
|
+#define use_lock(M) ((M)->mflags & USE_LOCK_BIT)
|
|
|
+#define enable_lock(M) ((M)->mflags |= USE_LOCK_BIT)
|
|
|
+#define disable_lock(M) ((M)->mflags &= ~USE_LOCK_BIT)
|
|
|
+
|
|
|
+#define use_mmap(M) ((M)->mflags & USE_MMAP_BIT)
|
|
|
+#define enable_mmap(M) ((M)->mflags |= USE_MMAP_BIT)
|
|
|
+#define disable_mmap(M) ((M)->mflags &= ~USE_MMAP_BIT)
|
|
|
+
|
|
|
+#define use_noncontiguous(M) ((M)->mflags & USE_NONCONTIGUOUS_BIT)
|
|
|
+#define disable_contiguous(M) ((M)->mflags |= USE_NONCONTIGUOUS_BIT)
|
|
|
+
|
|
|
+#define set_lock(M,L)\
|
|
|
+ ((M)->mflags = (L)?\
|
|
|
+ ((M)->mflags | USE_LOCK_BIT) :\
|
|
|
+ ((M)->mflags & ~USE_LOCK_BIT))
|
|
|
+
|
|
|
+/* page-align a size */
|
|
|
+#define page_align(S)\
|
|
|
+ (((S) + (mparams.page_size - SIZE_T_ONE)) & ~(mparams.page_size - SIZE_T_ONE))
|
|
|
+
|
|
|
+/* granularity-align a size */
|
|
|
+#define granularity_align(S)\
|
|
|
+ (((S) + (mparams.granularity - SIZE_T_ONE))\
|
|
|
+ & ~(mparams.granularity - SIZE_T_ONE))
|
|
|
+
|
|
|
+
|
|
|
+/* For mmap, use granularity alignment on windows, else page-align */
|
|
|
+#ifdef WIN32
|
|
|
+#define mmap_align(S) granularity_align(S)
|
|
|
+#else
|
|
|
+#define mmap_align(S) page_align(S)
|
|
|
+#endif
|
|
|
+
|
|
|
+/* For sys_alloc, enough padding to ensure can malloc request on success */
|
|
|
+#define SYS_ALLOC_PADDING (TOP_FOOT_SIZE + MALLOC_ALIGNMENT)
|
|
|
+
|
|
|
+#define is_page_aligned(S)\
|
|
|
+ (((size_t)(S) & (mparams.page_size - SIZE_T_ONE)) == 0)
|
|
|
+#define is_granularity_aligned(S)\
|
|
|
+ (((size_t)(S) & (mparams.granularity - SIZE_T_ONE)) == 0)
|
|
|
+
|
|
|
+/* True if segment S holds address A */
|
|
|
+#define segment_holds(S, A)\
|
|
|
+ ((char*)(A) >= S->base && (char*)(A) < S->base + S->size)
|
|
|
+
|
|
|
+/* Return segment holding given address */
|
|
|
+static msegmentptr segment_holding(mstate m, char* addr) {
|
|
|
+ msegmentptr sp = &m->seg;
|
|
|
+ for (;;) {
|
|
|
+ if (addr >= sp->base && addr < sp->base + sp->size)
|
|
|
+ return sp;
|
|
|
+ if ((sp = sp->next) == 0)
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* Return true if segment contains a segment link */
|
|
|
+static int has_segment_link(mstate m, msegmentptr ss) {
|
|
|
+ msegmentptr sp = &m->seg;
|
|
|
+ for (;;) {
|
|
|
+ if ((char*)sp >= ss->base && (char*)sp < ss->base + ss->size)
|
|
|
+ return 1;
|
|
|
+ if ((sp = sp->next) == 0)
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+#ifndef MORECORE_CANNOT_TRIM
|
|
|
+#define should_trim(M,s) ((s) > (M)->trim_check)
|
|
|
+#else /* MORECORE_CANNOT_TRIM */
|
|
|
+#define should_trim(M,s) (0)
|
|
|
+#endif /* MORECORE_CANNOT_TRIM */
|
|
|
+
|
|
|
+/*
|
|
|
+ TOP_FOOT_SIZE is padding at the end of a segment, including space
|
|
|
+ that may be needed to place segment records and fenceposts when new
|
|
|
+ noncontiguous segments are added.
|
|
|
+*/
|
|
|
+#define TOP_FOOT_SIZE\
|
|
|
+ (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE)
|
|
|
+
|
|
|
+
|
|
|
+/* ------------------------------- Hooks -------------------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ PREACTION should be defined to return 0 on success, and nonzero on
|
|
|
+ failure. If you are not using locking, you can redefine these to do
|
|
|
+ anything you like.
|
|
|
+*/
|
|
|
+
|
|
|
+#if USE_LOCKS
|
|
|
+
|
|
|
+#define PREACTION(M) ((use_lock(M))? ACQUIRE_LOCK(&(M)->mutex) : 0)
|
|
|
+#define POSTACTION(M) { if (use_lock(M)) RELEASE_LOCK(&(M)->mutex); }
|
|
|
+#else /* USE_LOCKS */
|
|
|
+
|
|
|
+#ifndef PREACTION
|
|
|
+#define PREACTION(M) (0)
|
|
|
+#endif /* PREACTION */
|
|
|
+
|
|
|
+#ifndef POSTACTION
|
|
|
+#define POSTACTION(M)
|
|
|
+#endif /* POSTACTION */
|
|
|
+
|
|
|
+#endif /* USE_LOCKS */
|
|
|
+
|
|
|
+/*
|
|
|
+ CORRUPTION_ERROR_ACTION is triggered upon detected bad addresses.
|
|
|
+ USAGE_ERROR_ACTION is triggered on detected bad frees and
|
|
|
+ reallocs. The argument p is an address that might have triggered the
|
|
|
+ fault. It is ignored by the two predefined actions, but might be
|
|
|
+ useful in custom actions that try to help diagnose errors.
|
|
|
+*/
|
|
|
+
|
|
|
+#if PROCEED_ON_ERROR
|
|
|
+
|
|
|
+/* A count of the number of corruption errors causing resets */
|
|
|
+int malloc_corruption_error_count;
|
|
|
+
|
|
|
+/* default corruption action */
|
|
|
+static void reset_on_error(mstate m);
|
|
|
+
|
|
|
+#define CORRUPTION_ERROR_ACTION(m) reset_on_error(m)
|
|
|
+#define USAGE_ERROR_ACTION(m, p)
|
|
|
+
|
|
|
+#else /* PROCEED_ON_ERROR */
|
|
|
+
|
|
|
+#ifndef CORRUPTION_ERROR_ACTION
|
|
|
+#define CORRUPTION_ERROR_ACTION(m) ABORT
|
|
|
+#endif /* CORRUPTION_ERROR_ACTION */
|
|
|
+
|
|
|
+#ifndef USAGE_ERROR_ACTION
|
|
|
+#define USAGE_ERROR_ACTION(m,p) ABORT
|
|
|
+#endif /* USAGE_ERROR_ACTION */
|
|
|
+
|
|
|
+#endif /* PROCEED_ON_ERROR */
|
|
|
+
|
|
|
+/* -------------------------- Debugging setup ---------------------------- */
|
|
|
+
|
|
|
+#if ! DEBUG
|
|
|
+
|
|
|
+#define check_free_chunk(M,P)
|
|
|
+#define check_inuse_chunk(M,P)
|
|
|
+#define check_malloced_chunk(M,P,N)
|
|
|
+#define check_mmapped_chunk(M,P)
|
|
|
+#define check_malloc_state(M)
|
|
|
+#define check_top_chunk(M,P)
|
|
|
+
|
|
|
+#else /* DEBUG */
|
|
|
+#define check_free_chunk(M,P) do_check_free_chunk(M,P)
|
|
|
+#define check_inuse_chunk(M,P) do_check_inuse_chunk(M,P)
|
|
|
+#define check_top_chunk(M,P) do_check_top_chunk(M,P)
|
|
|
+#define check_malloced_chunk(M,P,N) do_check_malloced_chunk(M,P,N)
|
|
|
+#define check_mmapped_chunk(M,P) do_check_mmapped_chunk(M,P)
|
|
|
+#define check_malloc_state(M) do_check_malloc_state(M)
|
|
|
+
|
|
|
+static void do_check_any_chunk(mstate m, mchunkptr p);
|
|
|
+static void do_check_top_chunk(mstate m, mchunkptr p);
|
|
|
+static void do_check_mmapped_chunk(mstate m, mchunkptr p);
|
|
|
+static void do_check_inuse_chunk(mstate m, mchunkptr p);
|
|
|
+static void do_check_free_chunk(mstate m, mchunkptr p);
|
|
|
+static void do_check_malloced_chunk(mstate m, void* mem, size_t s);
|
|
|
+static void do_check_tree(mstate m, tchunkptr t);
|
|
|
+static void do_check_treebin(mstate m, bindex_t i);
|
|
|
+static void do_check_smallbin(mstate m, bindex_t i);
|
|
|
+static void do_check_malloc_state(mstate m);
|
|
|
+static int bin_find(mstate m, mchunkptr x);
|
|
|
+static size_t traverse_and_check(mstate m);
|
|
|
+#endif /* DEBUG */
|
|
|
+
|
|
|
+/* ---------------------------- Indexing Bins ---------------------------- */
|
|
|
+
|
|
|
+#define is_small(s) (((s) >> SMALLBIN_SHIFT) < NSMALLBINS)
|
|
|
+#define small_index(s) (bindex_t)((s) >> SMALLBIN_SHIFT)
|
|
|
+#define small_index2size(i) ((i) << SMALLBIN_SHIFT)
|
|
|
+#define MIN_SMALL_INDEX (small_index(MIN_CHUNK_SIZE))
|
|
|
+
|
|
|
+/* addressing by index. See above about smallbin repositioning */
|
|
|
+#define smallbin_at(M, i) ((sbinptr)((char*)&((M)->smallbins[(i)<<1])))
|
|
|
+#define treebin_at(M,i) (&((M)->treebins[i]))
|
|
|
+
|
|
|
+/* assign tree index for size S to variable I. Use x86 asm if possible */
|
|
|
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
|
|
|
+#define compute_tree_index(S, I)\
|
|
|
+{\
|
|
|
+ unsigned int X = S >> TREEBIN_SHIFT;\
|
|
|
+ if (X == 0)\
|
|
|
+ I = 0;\
|
|
|
+ else if (X > 0xFFFF)\
|
|
|
+ I = NTREEBINS-1;\
|
|
|
+ else {\
|
|
|
+ unsigned int K;\
|
|
|
+ __asm__("bsrl\t%1, %0\n\t" : "=r" (K) : "g" (X));\
|
|
|
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
|
|
|
+ }\
|
|
|
+}
|
|
|
+
|
|
|
+#elif defined (__INTEL_COMPILER)
|
|
|
+#define compute_tree_index(S, I)\
|
|
|
+{\
|
|
|
+ size_t X = S >> TREEBIN_SHIFT;\
|
|
|
+ if (X == 0)\
|
|
|
+ I = 0;\
|
|
|
+ else if (X > 0xFFFF)\
|
|
|
+ I = NTREEBINS-1;\
|
|
|
+ else {\
|
|
|
+ unsigned int K = _bit_scan_reverse (X); \
|
|
|
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
|
|
|
+ }\
|
|
|
+}
|
|
|
+
|
|
|
+#elif defined(_MSC_VER) && _MSC_VER>=1300
|
|
|
+#define compute_tree_index(S, I)\
|
|
|
+{\
|
|
|
+ size_t X = S >> TREEBIN_SHIFT;\
|
|
|
+ if (X == 0)\
|
|
|
+ I = 0;\
|
|
|
+ else if (X > 0xFFFF)\
|
|
|
+ I = NTREEBINS-1;\
|
|
|
+ else {\
|
|
|
+ unsigned int K;\
|
|
|
+ _BitScanReverse((DWORD *) &K, (DWORD) X);\
|
|
|
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
|
|
|
+ }\
|
|
|
+}
|
|
|
+
|
|
|
+#else /* GNUC */
|
|
|
+#define compute_tree_index(S, I)\
|
|
|
+{\
|
|
|
+ size_t X = S >> TREEBIN_SHIFT;\
|
|
|
+ if (X == 0)\
|
|
|
+ I = 0;\
|
|
|
+ else if (X > 0xFFFF)\
|
|
|
+ I = NTREEBINS-1;\
|
|
|
+ else {\
|
|
|
+ unsigned int Y = (unsigned int)X;\
|
|
|
+ unsigned int N = ((Y - 0x100) >> 16) & 8;\
|
|
|
+ unsigned int K = (((Y <<= N) - 0x1000) >> 16) & 4;\
|
|
|
+ N += K;\
|
|
|
+ N += K = (((Y <<= K) - 0x4000) >> 16) & 2;\
|
|
|
+ K = 14 - N + ((Y <<= K) >> 15);\
|
|
|
+ I = (K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1));\
|
|
|
+ }\
|
|
|
+}
|
|
|
+#endif /* GNUC */
|
|
|
+
|
|
|
+/* Bit representing maximum resolved size in a treebin at i */
|
|
|
+#define bit_for_tree_index(i) \
|
|
|
+ (i == NTREEBINS-1)? (SIZE_T_BITSIZE-1) : (((i) >> 1) + TREEBIN_SHIFT - 2)
|
|
|
+
|
|
|
+/* Shift placing maximum resolved bit in a treebin at i as sign bit */
|
|
|
+#define leftshift_for_tree_index(i) \
|
|
|
+ ((i == NTREEBINS-1)? 0 : \
|
|
|
+ ((SIZE_T_BITSIZE-SIZE_T_ONE) - (((i) >> 1) + TREEBIN_SHIFT - 2)))
|
|
|
+
|
|
|
+/* The size of the smallest chunk held in bin with index i */
|
|
|
+#define minsize_for_tree_index(i) \
|
|
|
+ ((SIZE_T_ONE << (((i) >> 1) + TREEBIN_SHIFT)) | \
|
|
|
+ (((size_t)((i) & SIZE_T_ONE)) << (((i) >> 1) + TREEBIN_SHIFT - 1)))
|
|
|
+
|
|
|
+
|
|
|
+/* ------------------------ Operations on bin maps ----------------------- */
|
|
|
+
|
|
|
+/* bit corresponding to given index */
|
|
|
+#define idx2bit(i) ((binmap_t)(1) << (i))
|
|
|
+
|
|
|
+/* Mark/Clear bits with given index */
|
|
|
+#define mark_smallmap(M,i) ((M)->smallmap |= idx2bit(i))
|
|
|
+#define clear_smallmap(M,i) ((M)->smallmap &= ~idx2bit(i))
|
|
|
+#define smallmap_is_marked(M,i) ((M)->smallmap & idx2bit(i))
|
|
|
+
|
|
|
+#define mark_treemap(M,i) ((M)->treemap |= idx2bit(i))
|
|
|
+#define clear_treemap(M,i) ((M)->treemap &= ~idx2bit(i))
|
|
|
+#define treemap_is_marked(M,i) ((M)->treemap & idx2bit(i))
|
|
|
+
|
|
|
+/* isolate the least set bit of a bitmap */
|
|
|
+#define least_bit(x) ((x) & -(x))
|
|
|
+
|
|
|
+/* mask with all bits to left of least bit of x on */
|
|
|
+#define left_bits(x) ((x<<1) | -(x<<1))
|
|
|
+
|
|
|
+/* mask with all bits to left of or equal to least bit of x on */
|
|
|
+#define same_or_left_bits(x) ((x) | -(x))
|
|
|
+
|
|
|
+/* index corresponding to given bit. Use x86 asm if possible */
|
|
|
+
|
|
|
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
|
|
|
+#define compute_bit2idx(X, I)\
|
|
|
+{\
|
|
|
+ unsigned int J;\
|
|
|
+ __asm__("bsfl\t%1, %0\n\t" : "=r" (J) : "g" (X));\
|
|
|
+ I = (bindex_t)J;\
|
|
|
+}
|
|
|
+
|
|
|
+#elif defined (__INTEL_COMPILER)
|
|
|
+#define compute_bit2idx(X, I)\
|
|
|
+{\
|
|
|
+ unsigned int J;\
|
|
|
+ J = _bit_scan_forward (X); \
|
|
|
+ I = (bindex_t)J;\
|
|
|
+}
|
|
|
+
|
|
|
+#elif defined(_MSC_VER) && _MSC_VER>=1300
|
|
|
+#define compute_bit2idx(X, I)\
|
|
|
+{\
|
|
|
+ unsigned int J;\
|
|
|
+ _BitScanForward((DWORD *) &J, X);\
|
|
|
+ I = (bindex_t)J;\
|
|
|
+}
|
|
|
+
|
|
|
+#elif USE_BUILTIN_FFS
|
|
|
+#define compute_bit2idx(X, I) I = ffs(X)-1
|
|
|
+
|
|
|
+#else
|
|
|
+#define compute_bit2idx(X, I)\
|
|
|
+{\
|
|
|
+ unsigned int Y = X - 1;\
|
|
|
+ unsigned int K = Y >> (16-4) & 16;\
|
|
|
+ unsigned int N = K; Y >>= K;\
|
|
|
+ N += K = Y >> (8-3) & 8; Y >>= K;\
|
|
|
+ N += K = Y >> (4-2) & 4; Y >>= K;\
|
|
|
+ N += K = Y >> (2-1) & 2; Y >>= K;\
|
|
|
+ N += K = Y >> (1-0) & 1; Y >>= K;\
|
|
|
+ I = (bindex_t)(N + Y);\
|
|
|
+}
|
|
|
+#endif /* GNUC */
|
|
|
+
|
|
|
+
|
|
|
+/* ----------------------- Runtime Check Support ------------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ For security, the main invariant is that malloc/free/etc never
|
|
|
+ writes to a static address other than malloc_state, unless static
|
|
|
+ malloc_state itself has been corrupted, which cannot occur via
|
|
|
+ malloc (because of these checks). In essence this means that we
|
|
|
+ believe all pointers, sizes, maps etc held in malloc_state, but
|
|
|
+ check all of those linked or offsetted from other embedded data
|
|
|
+ structures. These checks are interspersed with main code in a way
|
|
|
+ that tends to minimize their run-time cost.
|
|
|
+
|
|
|
+ When FOOTERS is defined, in addition to range checking, we also
|
|
|
+ verify footer fields of inuse chunks, which can be used guarantee
|
|
|
+ that the mstate controlling malloc/free is intact. This is a
|
|
|
+ streamlined version of the approach described by William Robertson
|
|
|
+ et al in "Run-time Detection of Heap-based Overflows" LISA'03
|
|
|
+ http://www.usenix.org/events/lisa03/tech/robertson.html The footer
|
|
|
+ of an inuse chunk holds the xor of its mstate and a random seed,
|
|
|
+ that is checked upon calls to free() and realloc(). This is
|
|
|
+ (probablistically) unguessable from outside the program, but can be
|
|
|
+ computed by any code successfully malloc'ing any chunk, so does not
|
|
|
+ itself provide protection against code that has already broken
|
|
|
+ security through some other means. Unlike Robertson et al, we
|
|
|
+ always dynamically check addresses of all offset chunks (previous,
|
|
|
+ next, etc). This turns out to be cheaper than relying on hashes.
|
|
|
+*/
|
|
|
+
|
|
|
+#if !INSECURE
|
|
|
+/* Check if address a is at least as high as any from MORECORE or MMAP */
|
|
|
+#define ok_address(M, a) ((char*)(a) >= (M)->least_addr)
|
|
|
+/* Check if address of next chunk n is higher than base chunk p */
|
|
|
+#define ok_next(p, n) ((char*)(p) < (char*)(n))
|
|
|
+/* Check if p has inuse status */
|
|
|
+#define ok_inuse(p) is_inuse(p)
|
|
|
+/* Check if p has its pinuse bit on */
|
|
|
+#define ok_pinuse(p) pinuse(p)
|
|
|
+
|
|
|
+#else /* !INSECURE */
|
|
|
+#define ok_address(M, a) (1)
|
|
|
+#define ok_next(b, n) (1)
|
|
|
+#define ok_inuse(p) (1)
|
|
|
+#define ok_pinuse(p) (1)
|
|
|
+#endif /* !INSECURE */
|
|
|
+
|
|
|
+#if (FOOTERS && !INSECURE)
|
|
|
+/* Check if (alleged) mstate m has expected magic field */
|
|
|
+#define ok_magic(M) ((M)->magic == mparams.magic)
|
|
|
+#else /* (FOOTERS && !INSECURE) */
|
|
|
+#define ok_magic(M) (1)
|
|
|
+#endif /* (FOOTERS && !INSECURE) */
|
|
|
+
|
|
|
+
|
|
|
+/* In gcc, use __builtin_expect to minimize impact of checks */
|
|
|
+#if !INSECURE
|
|
|
+#if defined(__GNUC__) && __GNUC__ >= 3
|
|
|
+#define RTCHECK(e) __builtin_expect(e, 1)
|
|
|
+#else /* GNUC */
|
|
|
+#define RTCHECK(e) (e)
|
|
|
+#endif /* GNUC */
|
|
|
+#else /* !INSECURE */
|
|
|
+#define RTCHECK(e) (1)
|
|
|
+#endif /* !INSECURE */
|
|
|
+
|
|
|
+/* macros to set up inuse chunks with or without footers */
|
|
|
+
|
|
|
+#if !FOOTERS
|
|
|
+
|
|
|
+#define mark_inuse_foot(M,p,s)
|
|
|
+
|
|
|
+/* Macros for setting head/foot of non-mmapped chunks */
|
|
|
+
|
|
|
+/* Set cinuse bit and pinuse bit of next chunk */
|
|
|
+#define set_inuse(M,p,s)\
|
|
|
+ ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
|
|
|
+ ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
|
|
|
+
|
|
|
+/* Set cinuse and pinuse of this chunk and pinuse of next chunk */
|
|
|
+#define set_inuse_and_pinuse(M,p,s)\
|
|
|
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
|
|
|
+ ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
|
|
|
+
|
|
|
+/* Set size, cinuse and pinuse bit of this chunk */
|
|
|
+#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
|
|
|
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT))
|
|
|
+
|
|
|
+#else /* FOOTERS */
|
|
|
+
|
|
|
+/* Set foot of inuse chunk to be xor of mstate and seed */
|
|
|
+#define mark_inuse_foot(M,p,s)\
|
|
|
+ (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic))
|
|
|
+
|
|
|
+#define get_mstate_for(p)\
|
|
|
+ ((mstate)(((mchunkptr)((char*)(p) +\
|
|
|
+ (chunksize(p))))->prev_foot ^ mparams.magic))
|
|
|
+
|
|
|
+#define set_inuse(M,p,s)\
|
|
|
+ ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
|
|
|
+ (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT), \
|
|
|
+ mark_inuse_foot(M,p,s))
|
|
|
+
|
|
|
+#define set_inuse_and_pinuse(M,p,s)\
|
|
|
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
|
|
|
+ (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT),\
|
|
|
+ mark_inuse_foot(M,p,s))
|
|
|
+
|
|
|
+#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
|
|
|
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
|
|
|
+ mark_inuse_foot(M, p, s))
|
|
|
+
|
|
|
+#endif /* !FOOTERS */
|
|
|
+
|
|
|
+/* ---------------------------- setting mparams -------------------------- */
|
|
|
+
|
|
|
+#ifdef ENABLE_LARGE_PAGES
|
|
|
+typedef size_t (WINAPI *GetLargePageMinimum_t)(void);
|
|
|
+#endif
|
|
|
+
|
|
|
+/* Initialize mparams */
|
|
|
+static int init_mparams(void) {
|
|
|
+#ifdef NEED_GLOBAL_LOCK_INIT
|
|
|
+ if (malloc_global_mutex_status <= 0)
|
|
|
+ init_malloc_global_mutex();
|
|
|
+#endif
|
|
|
+
|
|
|
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
|
|
|
+ if (mparams.magic == 0) {
|
|
|
+ size_t magic;
|
|
|
+ size_t psize;
|
|
|
+ size_t gsize;
|
|
|
+
|
|
|
+#ifndef WIN32
|
|
|
+ psize = malloc_getpagesize;
|
|
|
+ gsize = ((DEFAULT_GRANULARITY != 0)? DEFAULT_GRANULARITY : psize);
|
|
|
+#else /* WIN32 */
|
|
|
+ {
|
|
|
+ SYSTEM_INFO system_info;
|
|
|
+ GetSystemInfo(&system_info);
|
|
|
+ psize = system_info.dwPageSize;
|
|
|
+ gsize = ((DEFAULT_GRANULARITY != 0)?
|
|
|
+ DEFAULT_GRANULARITY : system_info.dwAllocationGranularity);
|
|
|
+#ifdef ENABLE_LARGE_PAGES
|
|
|
+ {
|
|
|
+ GetLargePageMinimum_t GetLargePageMinimum_ = (GetLargePageMinimum_t) GetProcAddress(GetModuleHandle(__T("kernel32.dll")), "GetLargePageMinimum");
|
|
|
+ if(GetLargePageMinimum_) {
|
|
|
+ size_t largepagesize = GetLargePageMinimum_();
|
|
|
+ if(largepagesize) {
|
|
|
+ psize = largepagesize;
|
|
|
+ gsize = ((DEFAULT_GRANULARITY != 0)?
|
|
|
+ DEFAULT_GRANULARITY : largepagesize);
|
|
|
+ if(gsize < largepagesize) gsize = largepagesize;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+#endif
|
|
|
+ }
|
|
|
+#endif /* WIN32 */
|
|
|
+
|
|
|
+ /* Sanity-check configuration:
|
|
|
+ size_t must be unsigned and as wide as pointer type.
|
|
|
+ ints must be at least 4 bytes.
|
|
|
+ alignment must be at least 8.
|
|
|
+ Alignment, min chunk size, and page size must all be powers of 2.
|
|
|
+ */
|
|
|
+ if ((sizeof(size_t) != sizeof(char*)) ||
|
|
|
+ (MAX_SIZE_T < MIN_CHUNK_SIZE) ||
|
|
|
+ (sizeof(int) < 4) ||
|
|
|
+ (MALLOC_ALIGNMENT < (size_t)8U) ||
|
|
|
+ ((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-SIZE_T_ONE)) != 0) ||
|
|
|
+ ((MCHUNK_SIZE & (MCHUNK_SIZE-SIZE_T_ONE)) != 0) ||
|
|
|
+ ((gsize & (gsize-SIZE_T_ONE)) != 0) ||
|
|
|
+ ((psize & (psize-SIZE_T_ONE)) != 0))
|
|
|
+ ABORT;
|
|
|
+
|
|
|
+ mparams.granularity = gsize;
|
|
|
+ mparams.page_size = psize;
|
|
|
+ mparams.mmap_threshold = DEFAULT_MMAP_THRESHOLD;
|
|
|
+ mparams.trim_threshold = DEFAULT_TRIM_THRESHOLD;
|
|
|
+#if MORECORE_CONTIGUOUS
|
|
|
+ mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT;
|
|
|
+#else /* MORECORE_CONTIGUOUS */
|
|
|
+ mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT|USE_NONCONTIGUOUS_BIT;
|
|
|
+#endif /* MORECORE_CONTIGUOUS */
|
|
|
+
|
|
|
+#if !ONLY_MSPACES
|
|
|
+ /* Set up lock for main malloc area */
|
|
|
+ gm->mflags = mparams.default_mflags;
|
|
|
+ INITIAL_LOCK(&gm->mutex);
|
|
|
+#endif
|
|
|
+
|
|
|
+ {
|
|
|
+#if USE_DEV_RANDOM
|
|
|
+ int fd;
|
|
|
+ unsigned char buf[sizeof(size_t)];
|
|
|
+ /* Try to use /dev/urandom, else fall back on using time */
|
|
|
+ if ((fd = open("/dev/urandom", O_RDONLY)) >= 0 &&
|
|
|
+ read(fd, buf, sizeof(buf)) == sizeof(buf)) {
|
|
|
+ magic = *((size_t *) buf);
|
|
|
+ close(fd);
|
|
|
+ }
|
|
|
+ else
|
|
|
+#endif /* USE_DEV_RANDOM */
|
|
|
+#ifdef WIN32
|
|
|
+ magic = (size_t)(GetTickCount() ^ (size_t)0x55555555U);
|
|
|
+#else
|
|
|
+ magic = (size_t)(time(0) ^ (size_t)0x55555555U);
|
|
|
+#endif
|
|
|
+ magic |= (size_t)8U; /* ensure nonzero */
|
|
|
+ magic &= ~(size_t)7U; /* improve chances of fault for bad values */
|
|
|
+ mparams.magic = magic;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ RELEASE_MALLOC_GLOBAL_LOCK();
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+/* support for mallopt */
|
|
|
+static int change_mparam(int param_number, int value) {
|
|
|
+ size_t val;
|
|
|
+ ensure_initialization();
|
|
|
+ val = (value == -1)? MAX_SIZE_T : (size_t)value;
|
|
|
+ switch(param_number) {
|
|
|
+ case M_TRIM_THRESHOLD:
|
|
|
+ mparams.trim_threshold = val;
|
|
|
+ return 1;
|
|
|
+ case M_GRANULARITY:
|
|
|
+ if (val >= mparams.page_size && ((val & (val-1)) == 0)) {
|
|
|
+ mparams.granularity = val;
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ return 0;
|
|
|
+ case M_MMAP_THRESHOLD:
|
|
|
+ mparams.mmap_threshold = val;
|
|
|
+ return 1;
|
|
|
+ default:
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+#if DEBUG
|
|
|
+/* ------------------------- Debugging Support --------------------------- */
|
|
|
+
|
|
|
+/* Check properties of any chunk, whether free, inuse, mmapped etc */
|
|
|
+static void do_check_any_chunk(mstate m, mchunkptr p) {
|
|
|
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
|
|
|
+ assert(ok_address(m, p));
|
|
|
+}
|
|
|
+
|
|
|
+/* Check properties of top chunk */
|
|
|
+static void do_check_top_chunk(mstate m, mchunkptr p) {
|
|
|
+ msegmentptr sp = segment_holding(m, (char*)p);
|
|
|
+ size_t sz = p->head & ~INUSE_BITS; /* third-lowest bit can be set! */
|
|
|
+ assert(sp != 0);
|
|
|
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
|
|
|
+ assert(ok_address(m, p));
|
|
|
+ assert(sz == m->topsize);
|
|
|
+ assert(sz > 0);
|
|
|
+ assert(sz == ((sp->base + sp->size) - (char*)p) - TOP_FOOT_SIZE);
|
|
|
+ assert(pinuse(p));
|
|
|
+ assert(!pinuse(chunk_plus_offset(p, sz)));
|
|
|
+}
|
|
|
+
|
|
|
+/* Check properties of (inuse) mmapped chunks */
|
|
|
+static void do_check_mmapped_chunk(mstate m, mchunkptr p) {
|
|
|
+ size_t sz = chunksize(p);
|
|
|
+ size_t len = (sz + (p->prev_foot) + MMAP_FOOT_PAD);
|
|
|
+ assert(is_mmapped(p));
|
|
|
+ assert(use_mmap(m));
|
|
|
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
|
|
|
+ assert(ok_address(m, p));
|
|
|
+ assert(!is_small(sz));
|
|
|
+ assert((len & (mparams.page_size-SIZE_T_ONE)) == 0);
|
|
|
+ assert(chunk_plus_offset(p, sz)->head == FENCEPOST_HEAD);
|
|
|
+ assert(chunk_plus_offset(p, sz+SIZE_T_SIZE)->head == 0);
|
|
|
+}
|
|
|
+
|
|
|
+/* Check properties of inuse chunks */
|
|
|
+static void do_check_inuse_chunk(mstate m, mchunkptr p) {
|
|
|
+ do_check_any_chunk(m, p);
|
|
|
+ assert(is_inuse(p));
|
|
|
+ assert(next_pinuse(p));
|
|
|
+ /* If not pinuse and not mmapped, previous chunk has OK offset */
|
|
|
+ assert(is_mmapped(p) || pinuse(p) || next_chunk(prev_chunk(p)) == p);
|
|
|
+ if (is_mmapped(p))
|
|
|
+ do_check_mmapped_chunk(m, p);
|
|
|
+}
|
|
|
+
|
|
|
+/* Check properties of free chunks */
|
|
|
+static void do_check_free_chunk(mstate m, mchunkptr p) {
|
|
|
+ size_t sz = chunksize(p);
|
|
|
+ mchunkptr next = chunk_plus_offset(p, sz);
|
|
|
+ do_check_any_chunk(m, p);
|
|
|
+ assert(!is_inuse(p));
|
|
|
+ assert(!next_pinuse(p));
|
|
|
+ assert (!is_mmapped(p));
|
|
|
+ if (p != m->dv && p != m->top) {
|
|
|
+ if (sz >= MIN_CHUNK_SIZE) {
|
|
|
+ assert((sz & CHUNK_ALIGN_MASK) == 0);
|
|
|
+ assert(is_aligned(chunk2mem(p)));
|
|
|
+ assert(next->prev_foot == sz);
|
|
|
+ assert(pinuse(p));
|
|
|
+ assert (next == m->top || is_inuse(next));
|
|
|
+ assert(p->fd->bk == p);
|
|
|
+ assert(p->bk->fd == p);
|
|
|
+ }
|
|
|
+ else /* markers are always of size SIZE_T_SIZE */
|
|
|
+ assert(sz == SIZE_T_SIZE);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* Check properties of malloced chunks at the point they are malloced */
|
|
|
+static void do_check_malloced_chunk(mstate m, void* mem, size_t s) {
|
|
|
+ if (mem != 0) {
|
|
|
+ mchunkptr p = mem2chunk(mem);
|
|
|
+ size_t sz = p->head & ~INUSE_BITS;
|
|
|
+ do_check_inuse_chunk(m, p);
|
|
|
+ assert((sz & CHUNK_ALIGN_MASK) == 0);
|
|
|
+ assert(sz >= MIN_CHUNK_SIZE);
|
|
|
+ assert(sz >= s);
|
|
|
+ /* unless mmapped, size is less than MIN_CHUNK_SIZE more than request */
|
|
|
+ assert(is_mmapped(p) || sz < (s + MIN_CHUNK_SIZE));
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* Check a tree and its subtrees. */
|
|
|
+static void do_check_tree(mstate m, tchunkptr t) {
|
|
|
+ tchunkptr head = 0;
|
|
|
+ tchunkptr u = t;
|
|
|
+ bindex_t tindex = t->index;
|
|
|
+ size_t tsize = chunksize(t);
|
|
|
+ bindex_t idx;
|
|
|
+ compute_tree_index(tsize, idx);
|
|
|
+ assert(tindex == idx);
|
|
|
+ assert(tsize >= MIN_LARGE_SIZE);
|
|
|
+ assert(tsize >= minsize_for_tree_index(idx));
|
|
|
+ assert((idx == NTREEBINS-1) || (tsize < minsize_for_tree_index((idx+1))));
|
|
|
+
|
|
|
+ do { /* traverse through chain of same-sized nodes */
|
|
|
+ do_check_any_chunk(m, ((mchunkptr)u));
|
|
|
+ assert(u->index == tindex);
|
|
|
+ assert(chunksize(u) == tsize);
|
|
|
+ assert(!is_inuse(u));
|
|
|
+ assert(!next_pinuse(u));
|
|
|
+ assert(u->fd->bk == u);
|
|
|
+ assert(u->bk->fd == u);
|
|
|
+ if (u->parent == 0) {
|
|
|
+ assert(u->child[0] == 0);
|
|
|
+ assert(u->child[1] == 0);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ assert(head == 0); /* only one node on chain has parent */
|
|
|
+ head = u;
|
|
|
+ assert(u->parent != u);
|
|
|
+ assert (u->parent->child[0] == u ||
|
|
|
+ u->parent->child[1] == u ||
|
|
|
+ *((tbinptr*)(u->parent)) == u);
|
|
|
+ if (u->child[0] != 0) {
|
|
|
+ assert(u->child[0]->parent == u);
|
|
|
+ assert(u->child[0] != u);
|
|
|
+ do_check_tree(m, u->child[0]);
|
|
|
+ }
|
|
|
+ if (u->child[1] != 0) {
|
|
|
+ assert(u->child[1]->parent == u);
|
|
|
+ assert(u->child[1] != u);
|
|
|
+ do_check_tree(m, u->child[1]);
|
|
|
+ }
|
|
|
+ if (u->child[0] != 0 && u->child[1] != 0) {
|
|
|
+ assert(chunksize(u->child[0]) < chunksize(u->child[1]));
|
|
|
+ }
|
|
|
+ }
|
|
|
+ u = u->fd;
|
|
|
+ } while (u != t);
|
|
|
+ assert(head != 0);
|
|
|
+}
|
|
|
+
|
|
|
+/* Check all the chunks in a treebin. */
|
|
|
+static void do_check_treebin(mstate m, bindex_t i) {
|
|
|
+ tbinptr* tb = treebin_at(m, i);
|
|
|
+ tchunkptr t = *tb;
|
|
|
+ int empty = (m->treemap & (1U << i)) == 0;
|
|
|
+ if (t == 0)
|
|
|
+ assert(empty);
|
|
|
+ if (!empty)
|
|
|
+ do_check_tree(m, t);
|
|
|
+}
|
|
|
+
|
|
|
+/* Check all the chunks in a smallbin. */
|
|
|
+static void do_check_smallbin(mstate m, bindex_t i) {
|
|
|
+ sbinptr b = smallbin_at(m, i);
|
|
|
+ mchunkptr p = b->bk;
|
|
|
+ unsigned int empty = (m->smallmap & (1U << i)) == 0;
|
|
|
+ if (p == b)
|
|
|
+ assert(empty);
|
|
|
+ if (!empty) {
|
|
|
+ for (; p != b; p = p->bk) {
|
|
|
+ size_t size = chunksize(p);
|
|
|
+ mchunkptr q;
|
|
|
+ /* each chunk claims to be free */
|
|
|
+ do_check_free_chunk(m, p);
|
|
|
+ /* chunk belongs in bin */
|
|
|
+ assert(small_index(size) == i);
|
|
|
+ assert(p->bk == b || chunksize(p->bk) == chunksize(p));
|
|
|
+ /* chunk is followed by an inuse chunk */
|
|
|
+ q = next_chunk(p);
|
|
|
+ if (q->head != FENCEPOST_HEAD)
|
|
|
+ do_check_inuse_chunk(m, q);
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* Find x in a bin. Used in other check functions. */
|
|
|
+static int bin_find(mstate m, mchunkptr x) {
|
|
|
+ size_t size = chunksize(x);
|
|
|
+ if (is_small(size)) {
|
|
|
+ bindex_t sidx = small_index(size);
|
|
|
+ sbinptr b = smallbin_at(m, sidx);
|
|
|
+ if (smallmap_is_marked(m, sidx)) {
|
|
|
+ mchunkptr p = b;
|
|
|
+ do {
|
|
|
+ if (p == x)
|
|
|
+ return 1;
|
|
|
+ } while ((p = p->fd) != b);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ bindex_t tidx;
|
|
|
+ compute_tree_index(size, tidx);
|
|
|
+ if (treemap_is_marked(m, tidx)) {
|
|
|
+ tchunkptr t = *treebin_at(m, tidx);
|
|
|
+ size_t sizebits = size << leftshift_for_tree_index(tidx);
|
|
|
+ while (t != 0 && chunksize(t) != size) {
|
|
|
+ t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
|
|
|
+ sizebits <<= 1;
|
|
|
+ }
|
|
|
+ if (t != 0) {
|
|
|
+ tchunkptr u = t;
|
|
|
+ do {
|
|
|
+ if (u == (tchunkptr)x)
|
|
|
+ return 1;
|
|
|
+ } while ((u = u->fd) != t);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* Traverse each chunk and check it; return total */
|
|
|
+static size_t traverse_and_check(mstate m) {
|
|
|
+ size_t sum = 0;
|
|
|
+ if (is_initialized(m)) {
|
|
|
+ msegmentptr s = &m->seg;
|
|
|
+ sum += m->topsize + TOP_FOOT_SIZE;
|
|
|
+ while (s != 0) {
|
|
|
+ mchunkptr q = align_as_chunk(s->base);
|
|
|
+ mchunkptr lastq = 0;
|
|
|
+ assert(pinuse(q));
|
|
|
+ while (segment_holds(s, q) &&
|
|
|
+ q != m->top && q->head != FENCEPOST_HEAD) {
|
|
|
+ sum += chunksize(q);
|
|
|
+ if (is_inuse(q)) {
|
|
|
+ assert(!bin_find(m, q));
|
|
|
+ do_check_inuse_chunk(m, q);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ assert(q == m->dv || bin_find(m, q));
|
|
|
+ assert(lastq == 0 || is_inuse(lastq)); /* Not 2 consecutive free */
|
|
|
+ do_check_free_chunk(m, q);
|
|
|
+ }
|
|
|
+ lastq = q;
|
|
|
+ q = next_chunk(q);
|
|
|
+ }
|
|
|
+ s = s->next;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return sum;
|
|
|
+}
|
|
|
+
|
|
|
+/* Check all properties of malloc_state. */
|
|
|
+static void do_check_malloc_state(mstate m) {
|
|
|
+ bindex_t i;
|
|
|
+ size_t total;
|
|
|
+ /* check bins */
|
|
|
+ for (i = 0; i < NSMALLBINS; ++i)
|
|
|
+ do_check_smallbin(m, i);
|
|
|
+ for (i = 0; i < NTREEBINS; ++i)
|
|
|
+ do_check_treebin(m, i);
|
|
|
+
|
|
|
+ if (m->dvsize != 0) { /* check dv chunk */
|
|
|
+ do_check_any_chunk(m, m->dv);
|
|
|
+ assert(m->dvsize == chunksize(m->dv));
|
|
|
+ assert(m->dvsize >= MIN_CHUNK_SIZE);
|
|
|
+ assert(bin_find(m, m->dv) == 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (m->top != 0) { /* check top chunk */
|
|
|
+ do_check_top_chunk(m, m->top);
|
|
|
+ /*assert(m->topsize == chunksize(m->top)); redundant */
|
|
|
+ assert(m->topsize > 0);
|
|
|
+ assert(bin_find(m, m->top) == 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ total = traverse_and_check(m);
|
|
|
+ assert(total <= m->footprint);
|
|
|
+ assert(m->footprint <= m->max_footprint);
|
|
|
+}
|
|
|
+#endif /* DEBUG */
|
|
|
+
|
|
|
+/* ----------------------------- statistics ------------------------------ */
|
|
|
+
|
|
|
+#if !NO_MALLINFO
|
|
|
+static struct mallinfo internal_mallinfo(mstate m) {
|
|
|
+ struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
|
+ ensure_initialization();
|
|
|
+ if (!PREACTION(m)) {
|
|
|
+ check_malloc_state(m);
|
|
|
+ if (is_initialized(m)) {
|
|
|
+ size_t nfree = SIZE_T_ONE; /* top always free */
|
|
|
+ size_t mfree = m->topsize + TOP_FOOT_SIZE;
|
|
|
+ size_t sum = mfree;
|
|
|
+ msegmentptr s = &m->seg;
|
|
|
+ while (s != 0) {
|
|
|
+ mchunkptr q = align_as_chunk(s->base);
|
|
|
+ while (segment_holds(s, q) &&
|
|
|
+ q != m->top && q->head != FENCEPOST_HEAD) {
|
|
|
+ size_t sz = chunksize(q);
|
|
|
+ sum += sz;
|
|
|
+ if (!is_inuse(q)) {
|
|
|
+ mfree += sz;
|
|
|
+ ++nfree;
|
|
|
+ }
|
|
|
+ q = next_chunk(q);
|
|
|
+ }
|
|
|
+ s = s->next;
|
|
|
+ }
|
|
|
+
|
|
|
+ nm.arena = sum;
|
|
|
+ nm.ordblks = nfree;
|
|
|
+ nm.hblkhd = m->footprint - sum;
|
|
|
+ nm.usmblks = m->max_footprint;
|
|
|
+ nm.uordblks = m->footprint - mfree;
|
|
|
+ nm.fordblks = mfree;
|
|
|
+ nm.keepcost = m->topsize;
|
|
|
+ }
|
|
|
+
|
|
|
+ POSTACTION(m);
|
|
|
+ }
|
|
|
+ return nm;
|
|
|
+}
|
|
|
+#endif /* !NO_MALLINFO */
|
|
|
+
|
|
|
+static void internal_malloc_stats(mstate m) {
|
|
|
+ ensure_initialization();
|
|
|
+ if (!PREACTION(m)) {
|
|
|
+ size_t maxfp = 0;
|
|
|
+ size_t fp = 0;
|
|
|
+ size_t used = 0;
|
|
|
+ check_malloc_state(m);
|
|
|
+ if (is_initialized(m)) {
|
|
|
+ msegmentptr s = &m->seg;
|
|
|
+ maxfp = m->max_footprint;
|
|
|
+ fp = m->footprint;
|
|
|
+ used = fp - (m->topsize + TOP_FOOT_SIZE);
|
|
|
+
|
|
|
+ while (s != 0) {
|
|
|
+ mchunkptr q = align_as_chunk(s->base);
|
|
|
+ while (segment_holds(s, q) &&
|
|
|
+ q != m->top && q->head != FENCEPOST_HEAD) {
|
|
|
+ if (!is_inuse(q))
|
|
|
+ used -= chunksize(q);
|
|
|
+ q = next_chunk(q);
|
|
|
+ }
|
|
|
+ s = s->next;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ fprintf(stderr, "max system bytes = %10lu\n", (unsigned long)(maxfp));
|
|
|
+ fprintf(stderr, "system bytes = %10lu\n", (unsigned long)(fp));
|
|
|
+ fprintf(stderr, "in use bytes = %10lu\n", (unsigned long)(used));
|
|
|
+
|
|
|
+ POSTACTION(m);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* ----------------------- Operations on smallbins ----------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ Various forms of linking and unlinking are defined as macros. Even
|
|
|
+ the ones for trees, which are very long but have very short typical
|
|
|
+ paths. This is ugly but reduces reliance on inlining support of
|
|
|
+ compilers.
|
|
|
+*/
|
|
|
+
|
|
|
+/* Link a free chunk into a smallbin */
|
|
|
+#define insert_small_chunk(M, P, S) {\
|
|
|
+ bindex_t I = small_index(S);\
|
|
|
+ mchunkptr B = smallbin_at(M, I);\
|
|
|
+ mchunkptr F = B;\
|
|
|
+ assert(S >= MIN_CHUNK_SIZE);\
|
|
|
+ if (!smallmap_is_marked(M, I))\
|
|
|
+ mark_smallmap(M, I);\
|
|
|
+ else if (RTCHECK(ok_address(M, B->fd)))\
|
|
|
+ F = B->fd;\
|
|
|
+ else {\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ }\
|
|
|
+ B->fd = P;\
|
|
|
+ F->bk = P;\
|
|
|
+ P->fd = F;\
|
|
|
+ P->bk = B;\
|
|
|
+}
|
|
|
+
|
|
|
+/* Unlink a chunk from a smallbin */
|
|
|
+#define unlink_small_chunk(M, P, S) {\
|
|
|
+ mchunkptr F = P->fd;\
|
|
|
+ mchunkptr B = P->bk;\
|
|
|
+ bindex_t I = small_index(S);\
|
|
|
+ assert(P != B);\
|
|
|
+ assert(P != F);\
|
|
|
+ assert(chunksize(P) == small_index2size(I));\
|
|
|
+ if (F == B)\
|
|
|
+ clear_smallmap(M, I);\
|
|
|
+ else if (RTCHECK((F == smallbin_at(M,I) || ok_address(M, F)) &&\
|
|
|
+ (B == smallbin_at(M,I) || ok_address(M, B)))) {\
|
|
|
+ F->bk = B;\
|
|
|
+ B->fd = F;\
|
|
|
+ }\
|
|
|
+ else {\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ }\
|
|
|
+}
|
|
|
+
|
|
|
+/* Unlink the first chunk from a smallbin */
|
|
|
+#define unlink_first_small_chunk(M, B, P, I) {\
|
|
|
+ mchunkptr F = P->fd;\
|
|
|
+ assert(P != B);\
|
|
|
+ assert(P != F);\
|
|
|
+ assert(chunksize(P) == small_index2size(I));\
|
|
|
+ if (B == F)\
|
|
|
+ clear_smallmap(M, I);\
|
|
|
+ else if (RTCHECK(ok_address(M, F))) {\
|
|
|
+ B->fd = F;\
|
|
|
+ F->bk = B;\
|
|
|
+ }\
|
|
|
+ else {\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ }\
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+/* Replace dv node, binning the old one */
|
|
|
+/* Used only when dvsize known to be small */
|
|
|
+#define replace_dv(M, P, S) {\
|
|
|
+ size_t DVS = M->dvsize;\
|
|
|
+ if (DVS != 0) {\
|
|
|
+ mchunkptr DV = M->dv;\
|
|
|
+ assert(is_small(DVS));\
|
|
|
+ insert_small_chunk(M, DV, DVS);\
|
|
|
+ }\
|
|
|
+ M->dvsize = S;\
|
|
|
+ M->dv = P;\
|
|
|
+}
|
|
|
+
|
|
|
+/* ------------------------- Operations on trees ------------------------- */
|
|
|
+
|
|
|
+/* Insert chunk into tree */
|
|
|
+#define insert_large_chunk(M, X, S) {\
|
|
|
+ tbinptr* H;\
|
|
|
+ bindex_t I;\
|
|
|
+ compute_tree_index(S, I);\
|
|
|
+ H = treebin_at(M, I);\
|
|
|
+ X->index = I;\
|
|
|
+ X->child[0] = X->child[1] = 0;\
|
|
|
+ if (!treemap_is_marked(M, I)) {\
|
|
|
+ mark_treemap(M, I);\
|
|
|
+ *H = X;\
|
|
|
+ X->parent = (tchunkptr)H;\
|
|
|
+ X->fd = X->bk = X;\
|
|
|
+ }\
|
|
|
+ else {\
|
|
|
+ tchunkptr T = *H;\
|
|
|
+ size_t K = S << leftshift_for_tree_index(I);\
|
|
|
+ for (;;) {\
|
|
|
+ if (chunksize(T) != S) {\
|
|
|
+ tchunkptr* C = &(T->child[(K >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]);\
|
|
|
+ K <<= 1;\
|
|
|
+ if (*C != 0)\
|
|
|
+ T = *C;\
|
|
|
+ else if (RTCHECK(ok_address(M, C))) {\
|
|
|
+ *C = X;\
|
|
|
+ X->parent = T;\
|
|
|
+ X->fd = X->bk = X;\
|
|
|
+ break;\
|
|
|
+ }\
|
|
|
+ else {\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ break;\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+ else {\
|
|
|
+ tchunkptr F = T->fd;\
|
|
|
+ if (RTCHECK(ok_address(M, T) && ok_address(M, F))) {\
|
|
|
+ T->fd = F->bk = X;\
|
|
|
+ X->fd = F;\
|
|
|
+ X->bk = T;\
|
|
|
+ X->parent = 0;\
|
|
|
+ break;\
|
|
|
+ }\
|
|
|
+ else {\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ break;\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ Unlink steps:
|
|
|
+
|
|
|
+ 1. If x is a chained node, unlink it from its same-sized fd/bk links
|
|
|
+ and choose its bk node as its replacement.
|
|
|
+ 2. If x was the last node of its size, but not a leaf node, it must
|
|
|
+ be replaced with a leaf node (not merely one with an open left or
|
|
|
+ right), to make sure that lefts and rights of descendents
|
|
|
+ correspond properly to bit masks. We use the rightmost descendent
|
|
|
+ of x. We could use any other leaf, but this is easy to locate and
|
|
|
+ tends to counteract removal of leftmosts elsewhere, and so keeps
|
|
|
+ paths shorter than minimally guaranteed. This doesn't loop much
|
|
|
+ because on average a node in a tree is near the bottom.
|
|
|
+ 3. If x is the base of a chain (i.e., has parent links) relink
|
|
|
+ x's parent and children to x's replacement (or null if none).
|
|
|
+*/
|
|
|
+
|
|
|
+#define unlink_large_chunk(M, X) {\
|
|
|
+ tchunkptr XP = X->parent;\
|
|
|
+ tchunkptr R;\
|
|
|
+ if (X->bk != X) {\
|
|
|
+ tchunkptr F = X->fd;\
|
|
|
+ R = X->bk;\
|
|
|
+ if (RTCHECK(ok_address(M, F))) {\
|
|
|
+ F->bk = R;\
|
|
|
+ R->fd = F;\
|
|
|
+ }\
|
|
|
+ else {\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+ else {\
|
|
|
+ tchunkptr* RP;\
|
|
|
+ if (((R = *(RP = &(X->child[1]))) != 0) ||\
|
|
|
+ ((R = *(RP = &(X->child[0]))) != 0)) {\
|
|
|
+ tchunkptr* CP;\
|
|
|
+ while ((*(CP = &(R->child[1])) != 0) ||\
|
|
|
+ (*(CP = &(R->child[0])) != 0)) {\
|
|
|
+ R = *(RP = CP);\
|
|
|
+ }\
|
|
|
+ if (RTCHECK(ok_address(M, RP)))\
|
|
|
+ *RP = 0;\
|
|
|
+ else {\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+ if (XP != 0) {\
|
|
|
+ tbinptr* H = treebin_at(M, X->index);\
|
|
|
+ if (X == *H) {\
|
|
|
+ if ((*H = R) == 0) \
|
|
|
+ clear_treemap(M, X->index);\
|
|
|
+ }\
|
|
|
+ else if (RTCHECK(ok_address(M, XP))) {\
|
|
|
+ if (XP->child[0] == X) \
|
|
|
+ XP->child[0] = R;\
|
|
|
+ else \
|
|
|
+ XP->child[1] = R;\
|
|
|
+ }\
|
|
|
+ else\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ if (R != 0) {\
|
|
|
+ if (RTCHECK(ok_address(M, R))) {\
|
|
|
+ tchunkptr C0, C1;\
|
|
|
+ R->parent = XP;\
|
|
|
+ if ((C0 = X->child[0]) != 0) {\
|
|
|
+ if (RTCHECK(ok_address(M, C0))) {\
|
|
|
+ R->child[0] = C0;\
|
|
|
+ C0->parent = R;\
|
|
|
+ }\
|
|
|
+ else\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ }\
|
|
|
+ if ((C1 = X->child[1]) != 0) {\
|
|
|
+ if (RTCHECK(ok_address(M, C1))) {\
|
|
|
+ R->child[1] = C1;\
|
|
|
+ C1->parent = R;\
|
|
|
+ }\
|
|
|
+ else\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+ else\
|
|
|
+ CORRUPTION_ERROR_ACTION(M);\
|
|
|
+ }\
|
|
|
+ }\
|
|
|
+}
|
|
|
+
|
|
|
+/* Relays to large vs small bin operations */
|
|
|
+
|
|
|
+#define insert_chunk(M, P, S)\
|
|
|
+ if (is_small(S)) insert_small_chunk(M, P, S)\
|
|
|
+ else { tchunkptr TP = (tchunkptr)(P); insert_large_chunk(M, TP, S); }
|
|
|
+
|
|
|
+#define unlink_chunk(M, P, S)\
|
|
|
+ if (is_small(S)) unlink_small_chunk(M, P, S)\
|
|
|
+ else { tchunkptr TP = (tchunkptr)(P); unlink_large_chunk(M, TP); }
|
|
|
+
|
|
|
+
|
|
|
+/* Relays to internal calls to malloc/free from realloc, memalign etc */
|
|
|
+
|
|
|
+#if ONLY_MSPACES
|
|
|
+#define internal_malloc(m, b) mspace_malloc(m, b)
|
|
|
+#define internal_free(m, mem) mspace_free(m,mem);
|
|
|
+#else /* ONLY_MSPACES */
|
|
|
+#if MSPACES
|
|
|
+#define internal_malloc(m, b)\
|
|
|
+ (m == gm)? dlmalloc(b) : mspace_malloc(m, b)
|
|
|
+#define internal_free(m, mem)\
|
|
|
+ if (m == gm) dlfree(mem); else mspace_free(m,mem);
|
|
|
+#else /* MSPACES */
|
|
|
+#define internal_malloc(m, b) dlmalloc(b)
|
|
|
+#define internal_free(m, mem) dlfree(mem)
|
|
|
+#endif /* MSPACES */
|
|
|
+#endif /* ONLY_MSPACES */
|
|
|
+
|
|
|
+/* ----------------------- Direct-mmapping chunks ----------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ Directly mmapped chunks are set up with an offset to the start of
|
|
|
+ the mmapped region stored in the prev_foot field of the chunk. This
|
|
|
+ allows reconstruction of the required argument to MUNMAP when freed,
|
|
|
+ and also allows adjustment of the returned chunk to meet alignment
|
|
|
+ requirements (especially in memalign).
|
|
|
+*/
|
|
|
+
|
|
|
+/* Malloc using mmap */
|
|
|
+static void* mmap_alloc(mstate m, size_t nb) {
|
|
|
+ size_t mmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
|
|
|
+ if (mmsize > nb) { /* Check for wrap around 0 */
|
|
|
+ char* mm = (char*)(CALL_DIRECT_MMAP(mmsize));
|
|
|
+ if (mm != CMFAIL) {
|
|
|
+ size_t offset = align_offset(chunk2mem(mm));
|
|
|
+ size_t psize = mmsize - offset - MMAP_FOOT_PAD;
|
|
|
+ mchunkptr p = (mchunkptr)(mm + offset);
|
|
|
+ p->prev_foot = offset;
|
|
|
+ p->head = psize;
|
|
|
+ mark_inuse_foot(m, p, psize);
|
|
|
+ chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD;
|
|
|
+ chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0;
|
|
|
+
|
|
|
+ if (m->least_addr == 0 || mm < m->least_addr)
|
|
|
+ m->least_addr = mm;
|
|
|
+ if ((m->footprint += mmsize) > m->max_footprint)
|
|
|
+ m->max_footprint = m->footprint;
|
|
|
+ assert(is_aligned(chunk2mem(p)));
|
|
|
+ check_mmapped_chunk(m, p);
|
|
|
+ return chunk2mem(p);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* Realloc using mmap */
|
|
|
+static mchunkptr mmap_resize(mstate m, mchunkptr oldp, size_t nb) {
|
|
|
+ size_t oldsize = chunksize(oldp);
|
|
|
+ if (is_small(nb)) /* Can't shrink mmap regions below small size */
|
|
|
+ return 0;
|
|
|
+ /* Keep old chunk if big enough but not too big */
|
|
|
+ if (oldsize >= nb + SIZE_T_SIZE &&
|
|
|
+ (oldsize - nb) <= (mparams.granularity << 1))
|
|
|
+ return oldp;
|
|
|
+ else {
|
|
|
+ size_t offset = oldp->prev_foot;
|
|
|
+ size_t oldmmsize = oldsize + offset + MMAP_FOOT_PAD;
|
|
|
+ size_t newmmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
|
|
|
+ char* cp = (char*)CALL_MREMAP((char*)oldp - offset,
|
|
|
+ oldmmsize, newmmsize, 1);
|
|
|
+ if (cp != CMFAIL) {
|
|
|
+ mchunkptr newp = (mchunkptr)(cp + offset);
|
|
|
+ size_t psize = newmmsize - offset - MMAP_FOOT_PAD;
|
|
|
+ newp->head = psize;
|
|
|
+ mark_inuse_foot(m, newp, psize);
|
|
|
+ chunk_plus_offset(newp, psize)->head = FENCEPOST_HEAD;
|
|
|
+ chunk_plus_offset(newp, psize+SIZE_T_SIZE)->head = 0;
|
|
|
+
|
|
|
+ if (cp < m->least_addr)
|
|
|
+ m->least_addr = cp;
|
|
|
+ if ((m->footprint += newmmsize - oldmmsize) > m->max_footprint)
|
|
|
+ m->max_footprint = m->footprint;
|
|
|
+ check_mmapped_chunk(m, newp);
|
|
|
+ return newp;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* -------------------------- mspace management -------------------------- */
|
|
|
+
|
|
|
+/* Initialize top chunk and its size */
|
|
|
+static void init_top(mstate m, mchunkptr p, size_t psize) {
|
|
|
+ /* Ensure alignment */
|
|
|
+ size_t offset = align_offset(chunk2mem(p));
|
|
|
+ p = (mchunkptr)((char*)p + offset);
|
|
|
+ psize -= offset;
|
|
|
+
|
|
|
+ m->top = p;
|
|
|
+ m->topsize = psize;
|
|
|
+ p->head = psize | PINUSE_BIT;
|
|
|
+ /* set size of fake trailing chunk holding overhead space only once */
|
|
|
+ chunk_plus_offset(p, psize)->head = TOP_FOOT_SIZE;
|
|
|
+ m->trim_check = mparams.trim_threshold; /* reset on each update */
|
|
|
+}
|
|
|
+
|
|
|
+/* Initialize bins for a new mstate that is otherwise zeroed out */
|
|
|
+static void init_bins(mstate m) {
|
|
|
+ /* Establish circular links for smallbins */
|
|
|
+ bindex_t i;
|
|
|
+ for (i = 0; i < NSMALLBINS; ++i) {
|
|
|
+ sbinptr bin = smallbin_at(m,i);
|
|
|
+ bin->fd = bin->bk = bin;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+#if PROCEED_ON_ERROR
|
|
|
+
|
|
|
+/* default corruption action */
|
|
|
+static void reset_on_error(mstate m) {
|
|
|
+ int i;
|
|
|
+ ++malloc_corruption_error_count;
|
|
|
+ /* Reinitialize fields to forget about all memory */
|
|
|
+ m->smallbins = m->treebins = 0;
|
|
|
+ m->dvsize = m->topsize = 0;
|
|
|
+ m->seg.base = 0;
|
|
|
+ m->seg.size = 0;
|
|
|
+ m->seg.next = 0;
|
|
|
+ m->top = m->dv = 0;
|
|
|
+ for (i = 0; i < NTREEBINS; ++i)
|
|
|
+ *treebin_at(m, i) = 0;
|
|
|
+ init_bins(m);
|
|
|
+}
|
|
|
+#endif /* PROCEED_ON_ERROR */
|
|
|
+
|
|
|
+/* Allocate chunk and prepend remainder with chunk in successor base. */
|
|
|
+static void* prepend_alloc(mstate m, char* newbase, char* oldbase,
|
|
|
+ size_t nb) {
|
|
|
+ mchunkptr p = align_as_chunk(newbase);
|
|
|
+ mchunkptr oldfirst = align_as_chunk(oldbase);
|
|
|
+ size_t psize = (char*)oldfirst - (char*)p;
|
|
|
+ mchunkptr q = chunk_plus_offset(p, nb);
|
|
|
+ size_t qsize = psize - nb;
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(m, p, nb);
|
|
|
+
|
|
|
+ assert((char*)oldfirst > (char*)q);
|
|
|
+ assert(pinuse(oldfirst));
|
|
|
+ assert(qsize >= MIN_CHUNK_SIZE);
|
|
|
+
|
|
|
+ /* consolidate remainder with first chunk of old base */
|
|
|
+ if (oldfirst == m->top) {
|
|
|
+ size_t tsize = m->topsize += qsize;
|
|
|
+ m->top = q;
|
|
|
+ q->head = tsize | PINUSE_BIT;
|
|
|
+ check_top_chunk(m, q);
|
|
|
+ }
|
|
|
+ else if (oldfirst == m->dv) {
|
|
|
+ size_t dsize = m->dvsize += qsize;
|
|
|
+ m->dv = q;
|
|
|
+ set_size_and_pinuse_of_free_chunk(q, dsize);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ if (!is_inuse(oldfirst)) {
|
|
|
+ size_t nsize = chunksize(oldfirst);
|
|
|
+ unlink_chunk(m, oldfirst, nsize);
|
|
|
+ oldfirst = chunk_plus_offset(oldfirst, nsize);
|
|
|
+ qsize += nsize;
|
|
|
+ }
|
|
|
+ set_free_with_pinuse(q, qsize, oldfirst);
|
|
|
+ insert_chunk(m, q, qsize);
|
|
|
+ check_free_chunk(m, q);
|
|
|
+ }
|
|
|
+
|
|
|
+ check_malloced_chunk(m, chunk2mem(p), nb);
|
|
|
+ return chunk2mem(p);
|
|
|
+}
|
|
|
+
|
|
|
+/* Add a segment to hold a new noncontiguous region */
|
|
|
+static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) {
|
|
|
+ /* Determine locations and sizes of segment, fenceposts, old top */
|
|
|
+ char* old_top = (char*)m->top;
|
|
|
+ msegmentptr oldsp = segment_holding(m, old_top);
|
|
|
+ char* old_end = oldsp->base + oldsp->size;
|
|
|
+ size_t ssize = pad_request(sizeof(struct malloc_segment));
|
|
|
+ char* rawsp = old_end - (ssize + FOUR_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
|
|
|
+ size_t offset = align_offset(chunk2mem(rawsp));
|
|
|
+ char* asp = rawsp + offset;
|
|
|
+ char* csp = (asp < (old_top + MIN_CHUNK_SIZE))? old_top : asp;
|
|
|
+ mchunkptr sp = (mchunkptr)csp;
|
|
|
+ msegmentptr ss = (msegmentptr)(chunk2mem(sp));
|
|
|
+ mchunkptr tnext = chunk_plus_offset(sp, ssize);
|
|
|
+ mchunkptr p = tnext;
|
|
|
+ int nfences = 0;
|
|
|
+
|
|
|
+ /* reset top to new space */
|
|
|
+ init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
|
|
|
+
|
|
|
+ /* Set up segment record */
|
|
|
+ assert(is_aligned(ss));
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(m, sp, ssize);
|
|
|
+ *ss = m->seg; /* Push current record */
|
|
|
+ m->seg.base = tbase;
|
|
|
+ m->seg.size = tsize;
|
|
|
+ m->seg.sflags = mmapped;
|
|
|
+ m->seg.next = ss;
|
|
|
+
|
|
|
+ /* Insert trailing fenceposts */
|
|
|
+ for (;;) {
|
|
|
+ mchunkptr nextp = chunk_plus_offset(p, SIZE_T_SIZE);
|
|
|
+ p->head = FENCEPOST_HEAD;
|
|
|
+ ++nfences;
|
|
|
+ if ((char*)(&(nextp->head)) < old_end)
|
|
|
+ p = nextp;
|
|
|
+ else
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ assert(nfences >= 2);
|
|
|
+
|
|
|
+ /* Insert the rest of old top into a bin as an ordinary free chunk */
|
|
|
+ if (csp != old_top) {
|
|
|
+ mchunkptr q = (mchunkptr)old_top;
|
|
|
+ size_t psize = csp - old_top;
|
|
|
+ mchunkptr tn = chunk_plus_offset(q, psize);
|
|
|
+ set_free_with_pinuse(q, psize, tn);
|
|
|
+ insert_chunk(m, q, psize);
|
|
|
+ }
|
|
|
+
|
|
|
+ check_top_chunk(m, m->top);
|
|
|
+}
|
|
|
+
|
|
|
+/* -------------------------- System allocation -------------------------- */
|
|
|
+
|
|
|
+/* Get memory from system using MORECORE or MMAP */
|
|
|
+static void* sys_alloc(mstate m, size_t nb) {
|
|
|
+ char* tbase = CMFAIL;
|
|
|
+ size_t tsize = 0;
|
|
|
+ flag_t mmap_flag = 0;
|
|
|
+
|
|
|
+ ensure_initialization();
|
|
|
+
|
|
|
+ /* Directly map large chunks, but only if already initialized */
|
|
|
+ if (use_mmap(m) && nb >= mparams.mmap_threshold && m->topsize != 0) {
|
|
|
+ void* mem = mmap_alloc(m, nb);
|
|
|
+ if (mem != 0)
|
|
|
+ return mem;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ Try getting memory in any of three ways (in most-preferred to
|
|
|
+ least-preferred order):
|
|
|
+ 1. A call to MORECORE that can normally contiguously extend memory.
|
|
|
+ (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or
|
|
|
+ or main space is mmapped or a previous contiguous call failed)
|
|
|
+ 2. A call to MMAP new space (disabled if not HAVE_MMAP).
|
|
|
+ Note that under the default settings, if MORECORE is unable to
|
|
|
+ fulfill a request, and HAVE_MMAP is true, then mmap is
|
|
|
+ used as a noncontiguous system allocator. This is a useful backup
|
|
|
+ strategy for systems with holes in address spaces -- in this case
|
|
|
+ sbrk cannot contiguously expand the heap, but mmap may be able to
|
|
|
+ find space.
|
|
|
+ 3. A call to MORECORE that cannot usually contiguously extend memory.
|
|
|
+ (disabled if not HAVE_MORECORE)
|
|
|
+
|
|
|
+ In all cases, we need to request enough bytes from system to ensure
|
|
|
+ we can malloc nb bytes upon success, so pad with enough space for
|
|
|
+ top_foot, plus alignment-pad to make sure we don't lose bytes if
|
|
|
+ not on boundary, and round this up to a granularity unit.
|
|
|
+ */
|
|
|
+
|
|
|
+ if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) {
|
|
|
+ char* br = CMFAIL;
|
|
|
+ msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top);
|
|
|
+ size_t asize = 0;
|
|
|
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
|
|
|
+
|
|
|
+ if (ss == 0) { /* First time through or recovery */
|
|
|
+ char* base = (char*)CALL_MORECORE(0);
|
|
|
+ if (base != CMFAIL) {
|
|
|
+ asize = granularity_align(nb + SYS_ALLOC_PADDING);
|
|
|
+ /* Adjust to end on a page boundary */
|
|
|
+ if (!is_page_aligned(base))
|
|
|
+ asize += (page_align((size_t)base) - (size_t)base);
|
|
|
+ /* Can't call MORECORE if size is negative when treated as signed */
|
|
|
+ if (asize < HALF_MAX_SIZE_T &&
|
|
|
+ (br = (char*)(CALL_MORECORE(asize))) == base) {
|
|
|
+ tbase = base;
|
|
|
+ tsize = asize;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ /* Subtract out existing available top space from MORECORE request. */
|
|
|
+ asize = granularity_align(nb - m->topsize + SYS_ALLOC_PADDING);
|
|
|
+ /* Use mem here only if it did continuously extend old space */
|
|
|
+ if (asize < HALF_MAX_SIZE_T &&
|
|
|
+ (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) {
|
|
|
+ tbase = br;
|
|
|
+ tsize = asize;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (tbase == CMFAIL) { /* Cope with partial failure */
|
|
|
+ if (br != CMFAIL) { /* Try to use/extend the space we did get */
|
|
|
+ if (asize < HALF_MAX_SIZE_T &&
|
|
|
+ asize < nb + SYS_ALLOC_PADDING) {
|
|
|
+ size_t esize = granularity_align(nb + SYS_ALLOC_PADDING - asize);
|
|
|
+ if (esize < HALF_MAX_SIZE_T) {
|
|
|
+ char* end = (char*)CALL_MORECORE(esize);
|
|
|
+ if (end != CMFAIL)
|
|
|
+ asize += esize;
|
|
|
+ else { /* Can't use; try to release */
|
|
|
+ (void) CALL_MORECORE(-asize);
|
|
|
+ br = CMFAIL;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (br != CMFAIL) { /* Use the space we did get */
|
|
|
+ tbase = br;
|
|
|
+ tsize = asize;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ disable_contiguous(m); /* Don't try contiguous path in the future */
|
|
|
+ }
|
|
|
+
|
|
|
+ RELEASE_MALLOC_GLOBAL_LOCK();
|
|
|
+ }
|
|
|
+
|
|
|
+ if (HAVE_MMAP && tbase == CMFAIL) { /* Try MMAP */
|
|
|
+ size_t rsize = granularity_align(nb + SYS_ALLOC_PADDING);
|
|
|
+ if (rsize > nb) { /* Fail if wraps around zero */
|
|
|
+ char* mp = (char*)(CALL_MMAP(rsize));
|
|
|
+ if (mp != CMFAIL) {
|
|
|
+ tbase = mp;
|
|
|
+ tsize = rsize;
|
|
|
+ mmap_flag = USE_MMAP_BIT;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */
|
|
|
+ size_t asize = granularity_align(nb + SYS_ALLOC_PADDING);
|
|
|
+ if (asize < HALF_MAX_SIZE_T) {
|
|
|
+ char* br = CMFAIL;
|
|
|
+ char* end = CMFAIL;
|
|
|
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
|
|
|
+ br = (char*)(CALL_MORECORE(asize));
|
|
|
+ end = (char*)(CALL_MORECORE(0));
|
|
|
+ RELEASE_MALLOC_GLOBAL_LOCK();
|
|
|
+ if (br != CMFAIL && end != CMFAIL && br < end) {
|
|
|
+ size_t ssize = end - br;
|
|
|
+ if (ssize > nb + TOP_FOOT_SIZE) {
|
|
|
+ tbase = br;
|
|
|
+ tsize = ssize;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (tbase != CMFAIL) {
|
|
|
+
|
|
|
+ if ((m->footprint += tsize) > m->max_footprint)
|
|
|
+ m->max_footprint = m->footprint;
|
|
|
+
|
|
|
+ if (!is_initialized(m)) { /* first-time initialization */
|
|
|
+ if (m->least_addr == 0 || tbase < m->least_addr)
|
|
|
+ m->least_addr = tbase;
|
|
|
+ m->seg.base = tbase;
|
|
|
+ m->seg.size = tsize;
|
|
|
+ m->seg.sflags = mmap_flag;
|
|
|
+ m->magic = mparams.magic;
|
|
|
+ m->release_checks = MAX_RELEASE_CHECK_RATE;
|
|
|
+ init_bins(m);
|
|
|
+#if !ONLY_MSPACES
|
|
|
+ if (is_global(m))
|
|
|
+ init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
|
|
|
+ else
|
|
|
+#endif
|
|
|
+ {
|
|
|
+ /* Offset top by embedded malloc_state */
|
|
|
+ mchunkptr mn = next_chunk(mem2chunk(m));
|
|
|
+ init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ else {
|
|
|
+ /* Try to merge with an existing segment */
|
|
|
+ msegmentptr sp = &m->seg;
|
|
|
+ /* Only consider most recent segment if traversal suppressed */
|
|
|
+ while (sp != 0 && tbase != sp->base + sp->size)
|
|
|
+ sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
|
|
|
+ if (sp != 0 &&
|
|
|
+ !is_extern_segment(sp) &&
|
|
|
+ (sp->sflags & USE_MMAP_BIT) == mmap_flag &&
|
|
|
+ segment_holds(sp, m->top)) { /* append */
|
|
|
+ sp->size += tsize;
|
|
|
+ init_top(m, m->top, m->topsize + tsize);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ if (tbase < m->least_addr)
|
|
|
+ m->least_addr = tbase;
|
|
|
+ sp = &m->seg;
|
|
|
+ while (sp != 0 && sp->base != tbase + tsize)
|
|
|
+ sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
|
|
|
+ if (sp != 0 &&
|
|
|
+ !is_extern_segment(sp) &&
|
|
|
+ (sp->sflags & USE_MMAP_BIT) == mmap_flag) {
|
|
|
+ char* oldbase = sp->base;
|
|
|
+ sp->base = tbase;
|
|
|
+ sp->size += tsize;
|
|
|
+ return prepend_alloc(m, tbase, oldbase, nb);
|
|
|
+ }
|
|
|
+ else
|
|
|
+ add_segment(m, tbase, tsize, mmap_flag);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (nb < m->topsize) { /* Allocate from new or extended top space */
|
|
|
+ size_t rsize = m->topsize -= nb;
|
|
|
+ mchunkptr p = m->top;
|
|
|
+ mchunkptr r = m->top = chunk_plus_offset(p, nb);
|
|
|
+ r->head = rsize | PINUSE_BIT;
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(m, p, nb);
|
|
|
+ check_top_chunk(m, m->top);
|
|
|
+ check_malloced_chunk(m, chunk2mem(p), nb);
|
|
|
+ return chunk2mem(p);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ MALLOC_FAILURE_ACTION;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* ----------------------- system deallocation -------------------------- */
|
|
|
+
|
|
|
+/* Unmap and unlink any mmapped segments that don't contain used chunks */
|
|
|
+static size_t release_unused_segments(mstate m) {
|
|
|
+ size_t released = 0;
|
|
|
+ int nsegs = 0;
|
|
|
+ msegmentptr pred = &m->seg;
|
|
|
+ msegmentptr sp = pred->next;
|
|
|
+ while (sp != 0) {
|
|
|
+ char* base = sp->base;
|
|
|
+ size_t size = sp->size;
|
|
|
+ msegmentptr next = sp->next;
|
|
|
+ ++nsegs;
|
|
|
+ if (is_mmapped_segment(sp) && !is_extern_segment(sp)) {
|
|
|
+ mchunkptr p = align_as_chunk(base);
|
|
|
+ size_t psize = chunksize(p);
|
|
|
+ /* Can unmap if first chunk holds entire segment and not pinned */
|
|
|
+ if (!is_inuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) {
|
|
|
+ tchunkptr tp = (tchunkptr)p;
|
|
|
+ assert(segment_holds(sp, (char*)sp));
|
|
|
+ if (p == m->dv) {
|
|
|
+ m->dv = 0;
|
|
|
+ m->dvsize = 0;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ unlink_large_chunk(m, tp);
|
|
|
+ }
|
|
|
+ if (CALL_MUNMAP(base, size) == 0) {
|
|
|
+ released += size;
|
|
|
+ m->footprint -= size;
|
|
|
+ /* unlink obsoleted record */
|
|
|
+ sp = pred;
|
|
|
+ sp->next = next;
|
|
|
+ }
|
|
|
+ else { /* back out if cannot unmap */
|
|
|
+ insert_large_chunk(m, tp, psize);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (NO_SEGMENT_TRAVERSAL) /* scan only first segment */
|
|
|
+ break;
|
|
|
+ pred = sp;
|
|
|
+ sp = next;
|
|
|
+ }
|
|
|
+ /* Reset check counter */
|
|
|
+ m->release_checks = ((nsegs > MAX_RELEASE_CHECK_RATE)?
|
|
|
+ nsegs : MAX_RELEASE_CHECK_RATE);
|
|
|
+ return released;
|
|
|
+}
|
|
|
+
|
|
|
+static int sys_trim(mstate m, size_t pad) {
|
|
|
+ size_t released = 0;
|
|
|
+ ensure_initialization();
|
|
|
+ if (pad < MAX_REQUEST && is_initialized(m)) {
|
|
|
+ pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */
|
|
|
+
|
|
|
+ if (m->topsize > pad) {
|
|
|
+ /* Shrink top space in granularity-size units, keeping at least one */
|
|
|
+ size_t unit = mparams.granularity;
|
|
|
+ size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit -
|
|
|
+ SIZE_T_ONE) * unit;
|
|
|
+ msegmentptr sp = segment_holding(m, (char*)m->top);
|
|
|
+
|
|
|
+ if (!is_extern_segment(sp)) {
|
|
|
+ if (is_mmapped_segment(sp)) {
|
|
|
+ if (HAVE_MMAP &&
|
|
|
+ sp->size >= extra &&
|
|
|
+ !has_segment_link(m, sp)) { /* can't shrink if pinned */
|
|
|
+ size_t newsize = sp->size - extra;
|
|
|
+ /* Prefer mremap, fall back to munmap */
|
|
|
+ if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) ||
|
|
|
+ (CALL_MUNMAP(sp->base + newsize, extra) == 0)) {
|
|
|
+ released = extra;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else if (HAVE_MORECORE) {
|
|
|
+ if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */
|
|
|
+ extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit;
|
|
|
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
|
|
|
+ {
|
|
|
+ /* Make sure end of memory is where we last set it. */
|
|
|
+ char* old_br = (char*)(CALL_MORECORE(0));
|
|
|
+ if (old_br == sp->base + sp->size) {
|
|
|
+ char* rel_br = (char*)(CALL_MORECORE(-extra));
|
|
|
+ char* new_br = (char*)(CALL_MORECORE(0));
|
|
|
+ if (rel_br != CMFAIL && new_br < old_br)
|
|
|
+ released = old_br - new_br;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ RELEASE_MALLOC_GLOBAL_LOCK();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (released != 0) {
|
|
|
+ sp->size -= released;
|
|
|
+ m->footprint -= released;
|
|
|
+ init_top(m, m->top, m->topsize - released);
|
|
|
+ check_top_chunk(m, m->top);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Unmap any unused mmapped segments */
|
|
|
+ if (HAVE_MMAP)
|
|
|
+ released += release_unused_segments(m);
|
|
|
+
|
|
|
+ /* On failure, disable autotrim to avoid repeated failed future calls */
|
|
|
+ if (released == 0 && m->topsize > m->trim_check)
|
|
|
+ m->trim_check = MAX_SIZE_T;
|
|
|
+ }
|
|
|
+
|
|
|
+ return (released != 0)? 1 : 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/* ---------------------------- malloc support --------------------------- */
|
|
|
+
|
|
|
+/* allocate a large request from the best fitting chunk in a treebin */
|
|
|
+static void* tmalloc_large(mstate m, size_t nb) {
|
|
|
+ tchunkptr v = 0;
|
|
|
+ size_t rsize = -nb; /* Unsigned negation */
|
|
|
+ tchunkptr t;
|
|
|
+ bindex_t idx;
|
|
|
+ compute_tree_index(nb, idx);
|
|
|
+ if ((t = *treebin_at(m, idx)) != 0) {
|
|
|
+ /* Traverse tree for this bin looking for node with size == nb */
|
|
|
+ size_t sizebits = nb << leftshift_for_tree_index(idx);
|
|
|
+ tchunkptr rst = 0; /* The deepest untaken right subtree */
|
|
|
+ for (;;) {
|
|
|
+ tchunkptr rt;
|
|
|
+ size_t trem = chunksize(t) - nb;
|
|
|
+ if (trem < rsize) {
|
|
|
+ v = t;
|
|
|
+ if ((rsize = trem) == 0)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ rt = t->child[1];
|
|
|
+ t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
|
|
|
+ if (rt != 0 && rt != t)
|
|
|
+ rst = rt;
|
|
|
+ if (t == 0) {
|
|
|
+ t = rst; /* set t to least subtree holding sizes > nb */
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ sizebits <<= 1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */
|
|
|
+ binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap;
|
|
|
+ if (leftbits != 0) {
|
|
|
+ bindex_t i;
|
|
|
+ binmap_t leastbit = least_bit(leftbits);
|
|
|
+ compute_bit2idx(leastbit, i);
|
|
|
+ t = *treebin_at(m, i);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ while (t != 0) { /* find smallest of tree or subtree */
|
|
|
+ size_t trem = chunksize(t) - nb;
|
|
|
+ if (trem < rsize) {
|
|
|
+ rsize = trem;
|
|
|
+ v = t;
|
|
|
+ }
|
|
|
+ t = leftmost_child(t);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* If dv is a better fit, return 0 so malloc will use it */
|
|
|
+ if (v != 0 && rsize < (size_t)(m->dvsize - nb)) {
|
|
|
+ if (RTCHECK(ok_address(m, v))) { /* split */
|
|
|
+ mchunkptr r = chunk_plus_offset(v, nb);
|
|
|
+ assert(chunksize(v) == rsize + nb);
|
|
|
+ if (RTCHECK(ok_next(v, r))) {
|
|
|
+ unlink_large_chunk(m, v);
|
|
|
+ if (rsize < MIN_CHUNK_SIZE)
|
|
|
+ set_inuse_and_pinuse(m, v, (rsize + nb));
|
|
|
+ else {
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(m, v, nb);
|
|
|
+ set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
+ insert_chunk(m, r, rsize);
|
|
|
+ }
|
|
|
+ return chunk2mem(v);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ CORRUPTION_ERROR_ACTION(m);
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* allocate a small request from the best fitting chunk in a treebin */
|
|
|
+static void* tmalloc_small(mstate m, size_t nb) {
|
|
|
+ tchunkptr t, v;
|
|
|
+ size_t rsize;
|
|
|
+ bindex_t i;
|
|
|
+ binmap_t leastbit = least_bit(m->treemap);
|
|
|
+ compute_bit2idx(leastbit, i);
|
|
|
+ v = t = *treebin_at(m, i);
|
|
|
+ rsize = chunksize(t) - nb;
|
|
|
+
|
|
|
+ while ((t = leftmost_child(t)) != 0) {
|
|
|
+ size_t trem = chunksize(t) - nb;
|
|
|
+ if (trem < rsize) {
|
|
|
+ rsize = trem;
|
|
|
+ v = t;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (RTCHECK(ok_address(m, v))) {
|
|
|
+ mchunkptr r = chunk_plus_offset(v, nb);
|
|
|
+ assert(chunksize(v) == rsize + nb);
|
|
|
+ if (RTCHECK(ok_next(v, r))) {
|
|
|
+ unlink_large_chunk(m, v);
|
|
|
+ if (rsize < MIN_CHUNK_SIZE)
|
|
|
+ set_inuse_and_pinuse(m, v, (rsize + nb));
|
|
|
+ else {
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(m, v, nb);
|
|
|
+ set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
+ replace_dv(m, r, rsize);
|
|
|
+ }
|
|
|
+ return chunk2mem(v);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ CORRUPTION_ERROR_ACTION(m);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* --------------------------- realloc support --------------------------- */
|
|
|
+
|
|
|
+static void* internal_realloc(mstate m, void* oldmem, size_t bytes) {
|
|
|
+ if (bytes >= MAX_REQUEST) {
|
|
|
+ MALLOC_FAILURE_ACTION;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ if (!PREACTION(m)) {
|
|
|
+ mchunkptr oldp = mem2chunk(oldmem);
|
|
|
+ size_t oldsize = chunksize(oldp);
|
|
|
+ mchunkptr next = chunk_plus_offset(oldp, oldsize);
|
|
|
+ mchunkptr newp = 0;
|
|
|
+ void* extra = 0;
|
|
|
+
|
|
|
+ /* Try to either shrink or extend into top. Else malloc-copy-free */
|
|
|
+
|
|
|
+ if (RTCHECK(ok_address(m, oldp) && ok_inuse(oldp) &&
|
|
|
+ ok_next(oldp, next) && ok_pinuse(next))) {
|
|
|
+ size_t nb = request2size(bytes);
|
|
|
+ if (is_mmapped(oldp))
|
|
|
+ newp = mmap_resize(m, oldp, nb);
|
|
|
+ else if (oldsize >= nb) { /* already big enough */
|
|
|
+ size_t rsize = oldsize - nb;
|
|
|
+ newp = oldp;
|
|
|
+ if (rsize >= MIN_CHUNK_SIZE) {
|
|
|
+ mchunkptr remainder = chunk_plus_offset(newp, nb);
|
|
|
+ set_inuse(m, newp, nb);
|
|
|
+ set_inuse_and_pinuse(m, remainder, rsize);
|
|
|
+ extra = chunk2mem(remainder);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else if (next == m->top && oldsize + m->topsize > nb) {
|
|
|
+ /* Expand into top */
|
|
|
+ size_t newsize = oldsize + m->topsize;
|
|
|
+ size_t newtopsize = newsize - nb;
|
|
|
+ mchunkptr newtop = chunk_plus_offset(oldp, nb);
|
|
|
+ set_inuse(m, oldp, nb);
|
|
|
+ newtop->head = newtopsize |PINUSE_BIT;
|
|
|
+ m->top = newtop;
|
|
|
+ m->topsize = newtopsize;
|
|
|
+ newp = oldp;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ USAGE_ERROR_ACTION(m, oldmem);
|
|
|
+ POSTACTION(m);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+#if DEBUG
|
|
|
+ if (newp != 0) {
|
|
|
+ check_inuse_chunk(m, newp); /* Check requires lock */
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ POSTACTION(m);
|
|
|
+
|
|
|
+ if (newp != 0) {
|
|
|
+ if (extra != 0) {
|
|
|
+ internal_free(m, extra);
|
|
|
+ }
|
|
|
+ return chunk2mem(newp);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ void* newmem = internal_malloc(m, bytes);
|
|
|
+ if (newmem != 0) {
|
|
|
+ size_t oc = oldsize - overhead_for(oldp);
|
|
|
+ memcpy(newmem, oldmem, (oc < bytes)? oc : bytes);
|
|
|
+ internal_free(m, oldmem);
|
|
|
+ }
|
|
|
+ return newmem;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* --------------------------- memalign support -------------------------- */
|
|
|
+
|
|
|
+static void* internal_memalign(mstate m, size_t alignment, size_t bytes) {
|
|
|
+ if (alignment <= MALLOC_ALIGNMENT) /* Can just use malloc */
|
|
|
+ return internal_malloc(m, bytes);
|
|
|
+ if (alignment < MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */
|
|
|
+ alignment = MIN_CHUNK_SIZE;
|
|
|
+ if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */
|
|
|
+ size_t a = MALLOC_ALIGNMENT << 1;
|
|
|
+ while (a < alignment) a <<= 1;
|
|
|
+ alignment = a;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (bytes >= MAX_REQUEST - alignment) {
|
|
|
+ if (m != 0) { /* Test isn't needed but avoids compiler warning */
|
|
|
+ MALLOC_FAILURE_ACTION;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ size_t nb = request2size(bytes);
|
|
|
+ size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD;
|
|
|
+ char* mem = (char*)internal_malloc(m, req);
|
|
|
+ if (mem != 0) {
|
|
|
+ void* leader = 0;
|
|
|
+ void* trailer = 0;
|
|
|
+ mchunkptr p = mem2chunk(mem);
|
|
|
+
|
|
|
+ if (PREACTION(m)) return 0;
|
|
|
+ if ((((size_t)(mem)) % alignment) != 0) { /* misaligned */
|
|
|
+ /*
|
|
|
+ Find an aligned spot inside chunk. Since we need to give
|
|
|
+ back leading space in a chunk of at least MIN_CHUNK_SIZE, if
|
|
|
+ the first calculation places us at a spot with less than
|
|
|
+ MIN_CHUNK_SIZE leader, we can move to the next aligned spot.
|
|
|
+ We've allocated enough total room so that this is always
|
|
|
+ possible.
|
|
|
+ */
|
|
|
+ char* br = (char*)mem2chunk((size_t)(((size_t)(mem +
|
|
|
+ alignment -
|
|
|
+ SIZE_T_ONE)) &
|
|
|
+ -alignment));
|
|
|
+ char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)?
|
|
|
+ br : br+alignment;
|
|
|
+ mchunkptr newp = (mchunkptr)pos;
|
|
|
+ size_t leadsize = pos - (char*)(p);
|
|
|
+ size_t newsize = chunksize(p) - leadsize;
|
|
|
+
|
|
|
+ if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */
|
|
|
+ newp->prev_foot = p->prev_foot + leadsize;
|
|
|
+ newp->head = newsize;
|
|
|
+ }
|
|
|
+ else { /* Otherwise, give back leader, use the rest */
|
|
|
+ set_inuse(m, newp, newsize);
|
|
|
+ set_inuse(m, p, leadsize);
|
|
|
+ leader = chunk2mem(p);
|
|
|
+ }
|
|
|
+ p = newp;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Give back spare room at the end */
|
|
|
+ if (!is_mmapped(p)) {
|
|
|
+ size_t size = chunksize(p);
|
|
|
+ if (size > nb + MIN_CHUNK_SIZE) {
|
|
|
+ size_t remainder_size = size - nb;
|
|
|
+ mchunkptr remainder = chunk_plus_offset(p, nb);
|
|
|
+ set_inuse(m, p, nb);
|
|
|
+ set_inuse(m, remainder, remainder_size);
|
|
|
+ trailer = chunk2mem(remainder);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ assert (chunksize(p) >= nb);
|
|
|
+ assert((((size_t)(chunk2mem(p))) % alignment) == 0);
|
|
|
+ check_inuse_chunk(m, p);
|
|
|
+ POSTACTION(m);
|
|
|
+ if (leader != 0) {
|
|
|
+ internal_free(m, leader);
|
|
|
+ }
|
|
|
+ if (trailer != 0) {
|
|
|
+ internal_free(m, trailer);
|
|
|
+ }
|
|
|
+ return chunk2mem(p);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* ------------------------ comalloc/coalloc support --------------------- */
|
|
|
+
|
|
|
+static void** ialloc(mstate m,
|
|
|
+ size_t n_elements,
|
|
|
+ size_t* sizes,
|
|
|
+ int opts,
|
|
|
+ void* chunks[]) {
|
|
|
+ /*
|
|
|
+ This provides common support for independent_X routines, handling
|
|
|
+ all of the combinations that can result.
|
|
|
+
|
|
|
+ The opts arg has:
|
|
|
+ bit 0 set if all elements are same size (using sizes[0])
|
|
|
+ bit 1 set if elements should be zeroed
|
|
|
+ */
|
|
|
+
|
|
|
+ size_t element_size; /* chunksize of each element, if all same */
|
|
|
+ size_t contents_size; /* total size of elements */
|
|
|
+ size_t array_size; /* request size of pointer array */
|
|
|
+ void* mem; /* malloced aggregate space */
|
|
|
+ mchunkptr p; /* corresponding chunk */
|
|
|
+ size_t remainder_size; /* remaining bytes while splitting */
|
|
|
+ void** marray; /* either "chunks" or malloced ptr array */
|
|
|
+ mchunkptr array_chunk; /* chunk for malloced ptr array */
|
|
|
+ flag_t was_enabled; /* to disable mmap */
|
|
|
+ size_t size;
|
|
|
+ size_t i;
|
|
|
+
|
|
|
+ ensure_initialization();
|
|
|
+ /* compute array length, if needed */
|
|
|
+ if (chunks != 0) {
|
|
|
+ if (n_elements == 0)
|
|
|
+ return chunks; /* nothing to do */
|
|
|
+ marray = chunks;
|
|
|
+ array_size = 0;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ /* if empty req, must still return chunk representing empty array */
|
|
|
+ if (n_elements == 0)
|
|
|
+ return (void**)internal_malloc(m, 0);
|
|
|
+ marray = 0;
|
|
|
+ array_size = request2size(n_elements * (sizeof(void*)));
|
|
|
+ }
|
|
|
+
|
|
|
+ /* compute total element size */
|
|
|
+ if (opts & 0x1) { /* all-same-size */
|
|
|
+ element_size = request2size(*sizes);
|
|
|
+ contents_size = n_elements * element_size;
|
|
|
+ }
|
|
|
+ else { /* add up all the sizes */
|
|
|
+ element_size = 0;
|
|
|
+ contents_size = 0;
|
|
|
+ for (i = 0; i != n_elements; ++i)
|
|
|
+ contents_size += request2size(sizes[i]);
|
|
|
+ }
|
|
|
+
|
|
|
+ size = contents_size + array_size;
|
|
|
+
|
|
|
+ /*
|
|
|
+ Allocate the aggregate chunk. First disable direct-mmapping so
|
|
|
+ malloc won't use it, since we would not be able to later
|
|
|
+ free/realloc space internal to a segregated mmap region.
|
|
|
+ */
|
|
|
+ was_enabled = use_mmap(m);
|
|
|
+ disable_mmap(m);
|
|
|
+ mem = internal_malloc(m, size - CHUNK_OVERHEAD);
|
|
|
+ if (was_enabled)
|
|
|
+ enable_mmap(m);
|
|
|
+ if (mem == 0)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ if (PREACTION(m)) return 0;
|
|
|
+ p = mem2chunk(mem);
|
|
|
+ remainder_size = chunksize(p);
|
|
|
+
|
|
|
+ assert(!is_mmapped(p));
|
|
|
+
|
|
|
+ if (opts & 0x2) { /* optionally clear the elements */
|
|
|
+ memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* If not provided, allocate the pointer array as final part of chunk */
|
|
|
+ if (marray == 0) {
|
|
|
+ size_t array_chunk_size;
|
|
|
+ array_chunk = chunk_plus_offset(p, contents_size);
|
|
|
+ array_chunk_size = remainder_size - contents_size;
|
|
|
+ marray = (void**) (chunk2mem(array_chunk));
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size);
|
|
|
+ remainder_size = contents_size;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* split out elements */
|
|
|
+ for (i = 0; ; ++i) {
|
|
|
+ marray[i] = chunk2mem(p);
|
|
|
+ if (i != n_elements-1) {
|
|
|
+ if (element_size != 0)
|
|
|
+ size = element_size;
|
|
|
+ else
|
|
|
+ size = request2size(sizes[i]);
|
|
|
+ remainder_size -= size;
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(m, p, size);
|
|
|
+ p = chunk_plus_offset(p, size);
|
|
|
+ }
|
|
|
+ else { /* the final element absorbs any overallocation slop */
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+#if DEBUG
|
|
|
+ if (marray != chunks) {
|
|
|
+ /* final element must have exactly exhausted chunk */
|
|
|
+ if (element_size != 0) {
|
|
|
+ assert(remainder_size == element_size);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ assert(remainder_size == request2size(sizes[i]));
|
|
|
+ }
|
|
|
+ check_inuse_chunk(m, mem2chunk(marray));
|
|
|
+ }
|
|
|
+ for (i = 0; i != n_elements; ++i)
|
|
|
+ check_inuse_chunk(m, mem2chunk(marray[i]));
|
|
|
+
|
|
|
+#endif /* DEBUG */
|
|
|
+
|
|
|
+ POSTACTION(m);
|
|
|
+ return marray;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/* -------------------------- public routines ---------------------------- */
|
|
|
+
|
|
|
+#if !ONLY_MSPACES
|
|
|
+
|
|
|
+void* dlmalloc(size_t bytes) {
|
|
|
+ /*
|
|
|
+ Basic algorithm:
|
|
|
+ If a small request (< 256 bytes minus per-chunk overhead):
|
|
|
+ 1. If one exists, use a remainderless chunk in associated smallbin.
|
|
|
+ (Remainderless means that there are too few excess bytes to
|
|
|
+ represent as a chunk.)
|
|
|
+ 2. If it is big enough, use the dv chunk, which is normally the
|
|
|
+ chunk adjacent to the one used for the most recent small request.
|
|
|
+ 3. If one exists, split the smallest available chunk in a bin,
|
|
|
+ saving remainder in dv.
|
|
|
+ 4. If it is big enough, use the top chunk.
|
|
|
+ 5. If available, get memory from system and use it
|
|
|
+ Otherwise, for a large request:
|
|
|
+ 1. Find the smallest available binned chunk that fits, and use it
|
|
|
+ if it is better fitting than dv chunk, splitting if necessary.
|
|
|
+ 2. If better fitting than any binned chunk, use the dv chunk.
|
|
|
+ 3. If it is big enough, use the top chunk.
|
|
|
+ 4. If request size >= mmap threshold, try to directly mmap this chunk.
|
|
|
+ 5. If available, get memory from system and use it
|
|
|
+
|
|
|
+ The ugly goto's here ensure that postaction occurs along all paths.
|
|
|
+ */
|
|
|
+
|
|
|
+#if USE_LOCKS
|
|
|
+ ensure_initialization(); /* initialize in sys_alloc if not using locks */
|
|
|
+#endif
|
|
|
+
|
|
|
+ if (!PREACTION(gm)) {
|
|
|
+ void* mem;
|
|
|
+ size_t nb;
|
|
|
+ if (bytes <= MAX_SMALL_REQUEST) {
|
|
|
+ bindex_t idx;
|
|
|
+ binmap_t smallbits;
|
|
|
+ nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
|
|
|
+ idx = small_index(nb);
|
|
|
+ smallbits = gm->smallmap >> idx;
|
|
|
+
|
|
|
+ if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
|
|
|
+ mchunkptr b, p;
|
|
|
+ idx += ~smallbits & 1; /* Uses next bin if idx empty */
|
|
|
+ b = smallbin_at(gm, idx);
|
|
|
+ p = b->fd;
|
|
|
+ assert(chunksize(p) == small_index2size(idx));
|
|
|
+ unlink_first_small_chunk(gm, b, p, idx);
|
|
|
+ set_inuse_and_pinuse(gm, p, small_index2size(idx));
|
|
|
+ mem = chunk2mem(p);
|
|
|
+ check_malloced_chunk(gm, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+
|
|
|
+ else if (nb > gm->dvsize) {
|
|
|
+ if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
|
|
|
+ mchunkptr b, p, r;
|
|
|
+ size_t rsize;
|
|
|
+ bindex_t i;
|
|
|
+ binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
|
|
|
+ binmap_t leastbit = least_bit(leftbits);
|
|
|
+ compute_bit2idx(leastbit, i);
|
|
|
+ b = smallbin_at(gm, i);
|
|
|
+ p = b->fd;
|
|
|
+ assert(chunksize(p) == small_index2size(i));
|
|
|
+ unlink_first_small_chunk(gm, b, p, i);
|
|
|
+ rsize = small_index2size(i) - nb;
|
|
|
+ /* Fit here cannot be remainderless if 4byte sizes */
|
|
|
+ if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
|
|
|
+ set_inuse_and_pinuse(gm, p, small_index2size(i));
|
|
|
+ else {
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
|
|
|
+ r = chunk_plus_offset(p, nb);
|
|
|
+ set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
+ replace_dv(gm, r, rsize);
|
|
|
+ }
|
|
|
+ mem = chunk2mem(p);
|
|
|
+ check_malloced_chunk(gm, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+
|
|
|
+ else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) {
|
|
|
+ check_malloced_chunk(gm, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else if (bytes >= MAX_REQUEST)
|
|
|
+ nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
|
|
|
+ else {
|
|
|
+ nb = pad_request(bytes);
|
|
|
+ if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) {
|
|
|
+ check_malloced_chunk(gm, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (nb <= gm->dvsize) {
|
|
|
+ size_t rsize = gm->dvsize - nb;
|
|
|
+ mchunkptr p = gm->dv;
|
|
|
+ if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
|
|
|
+ mchunkptr r = gm->dv = chunk_plus_offset(p, nb);
|
|
|
+ gm->dvsize = rsize;
|
|
|
+ set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
|
|
|
+ }
|
|
|
+ else { /* exhaust dv */
|
|
|
+ size_t dvs = gm->dvsize;
|
|
|
+ gm->dvsize = 0;
|
|
|
+ gm->dv = 0;
|
|
|
+ set_inuse_and_pinuse(gm, p, dvs);
|
|
|
+ }
|
|
|
+ mem = chunk2mem(p);
|
|
|
+ check_malloced_chunk(gm, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+
|
|
|
+ else if (nb < gm->topsize) { /* Split top */
|
|
|
+ size_t rsize = gm->topsize -= nb;
|
|
|
+ mchunkptr p = gm->top;
|
|
|
+ mchunkptr r = gm->top = chunk_plus_offset(p, nb);
|
|
|
+ r->head = rsize | PINUSE_BIT;
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
|
|
|
+ mem = chunk2mem(p);
|
|
|
+ check_top_chunk(gm, gm->top);
|
|
|
+ check_malloced_chunk(gm, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+
|
|
|
+ mem = sys_alloc(gm, nb);
|
|
|
+
|
|
|
+ postaction:
|
|
|
+ POSTACTION(gm);
|
|
|
+ return mem;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+void dlfree(void* mem) {
|
|
|
+ /*
|
|
|
+ Consolidate freed chunks with preceeding or succeeding bordering
|
|
|
+ free chunks, if they exist, and then place in a bin. Intermixed
|
|
|
+ with special cases for top, dv, mmapped chunks, and usage errors.
|
|
|
+ */
|
|
|
+
|
|
|
+ if (mem != 0) {
|
|
|
+ mchunkptr p = mem2chunk(mem);
|
|
|
+#if FOOTERS
|
|
|
+ mstate fm = get_mstate_for(p);
|
|
|
+ if (!ok_magic(fm)) {
|
|
|
+ USAGE_ERROR_ACTION(fm, p);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+#else /* FOOTERS */
|
|
|
+#define fm gm
|
|
|
+#endif /* FOOTERS */
|
|
|
+ if (!PREACTION(fm)) {
|
|
|
+ check_inuse_chunk(fm, p);
|
|
|
+ if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {
|
|
|
+ size_t psize = chunksize(p);
|
|
|
+ mchunkptr next = chunk_plus_offset(p, psize);
|
|
|
+ if (!pinuse(p)) {
|
|
|
+ size_t prevsize = p->prev_foot;
|
|
|
+ if (is_mmapped(p)) {
|
|
|
+ psize += prevsize + MMAP_FOOT_PAD;
|
|
|
+ if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
|
|
|
+ fm->footprint -= psize;
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ mchunkptr prev = chunk_minus_offset(p, prevsize);
|
|
|
+ psize += prevsize;
|
|
|
+ p = prev;
|
|
|
+ if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
|
|
|
+ if (p != fm->dv) {
|
|
|
+ unlink_chunk(fm, p, prevsize);
|
|
|
+ }
|
|
|
+ else if ((next->head & INUSE_BITS) == INUSE_BITS) {
|
|
|
+ fm->dvsize = psize;
|
|
|
+ set_free_with_pinuse(p, psize, next);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ goto erroraction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
|
|
|
+ if (!cinuse(next)) { /* consolidate forward */
|
|
|
+ if (next == fm->top) {
|
|
|
+ size_t tsize = fm->topsize += psize;
|
|
|
+ fm->top = p;
|
|
|
+ p->head = tsize | PINUSE_BIT;
|
|
|
+ if (p == fm->dv) {
|
|
|
+ fm->dv = 0;
|
|
|
+ fm->dvsize = 0;
|
|
|
+ }
|
|
|
+ if (should_trim(fm, tsize))
|
|
|
+ sys_trim(fm, 0);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ else if (next == fm->dv) {
|
|
|
+ size_t dsize = fm->dvsize += psize;
|
|
|
+ fm->dv = p;
|
|
|
+ set_size_and_pinuse_of_free_chunk(p, dsize);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ size_t nsize = chunksize(next);
|
|
|
+ psize += nsize;
|
|
|
+ unlink_chunk(fm, next, nsize);
|
|
|
+ set_size_and_pinuse_of_free_chunk(p, psize);
|
|
|
+ if (p == fm->dv) {
|
|
|
+ fm->dvsize = psize;
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ set_free_with_pinuse(p, psize, next);
|
|
|
+
|
|
|
+ if (is_small(psize)) {
|
|
|
+ insert_small_chunk(fm, p, psize);
|
|
|
+ check_free_chunk(fm, p);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ tchunkptr tp = (tchunkptr)p;
|
|
|
+ insert_large_chunk(fm, tp, psize);
|
|
|
+ check_free_chunk(fm, p);
|
|
|
+ if (--fm->release_checks == 0)
|
|
|
+ release_unused_segments(fm);
|
|
|
+ }
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ erroraction:
|
|
|
+ USAGE_ERROR_ACTION(fm, p);
|
|
|
+ postaction:
|
|
|
+ POSTACTION(fm);
|
|
|
+ }
|
|
|
+ }
|
|
|
+#if !FOOTERS
|
|
|
+#undef fm
|
|
|
+#endif /* FOOTERS */
|
|
|
+}
|
|
|
+
|
|
|
+void* dlcalloc(size_t n_elements, size_t elem_size) {
|
|
|
+ void* mem;
|
|
|
+ size_t req = 0;
|
|
|
+ if (n_elements != 0) {
|
|
|
+ req = n_elements * elem_size;
|
|
|
+ if (((n_elements | elem_size) & ~(size_t)0xffff) &&
|
|
|
+ (req / n_elements != elem_size))
|
|
|
+ req = MAX_SIZE_T; /* force downstream failure on overflow */
|
|
|
+ }
|
|
|
+ mem = dlmalloc(req);
|
|
|
+ if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
|
|
|
+ memset(mem, 0, req);
|
|
|
+ return mem;
|
|
|
+}
|
|
|
+
|
|
|
+void* dlrealloc(void* oldmem, size_t bytes) {
|
|
|
+ if (oldmem == 0)
|
|
|
+ return dlmalloc(bytes);
|
|
|
+#ifdef REALLOC_ZERO_BYTES_FREES
|
|
|
+ if (bytes == 0) {
|
|
|
+ dlfree(oldmem);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+#endif /* REALLOC_ZERO_BYTES_FREES */
|
|
|
+ else {
|
|
|
+#if ! FOOTERS
|
|
|
+ mstate m = gm;
|
|
|
+#else /* FOOTERS */
|
|
|
+ mstate m = get_mstate_for(mem2chunk(oldmem));
|
|
|
+ if (!ok_magic(m)) {
|
|
|
+ USAGE_ERROR_ACTION(m, oldmem);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+#endif /* FOOTERS */
|
|
|
+ return internal_realloc(m, oldmem, bytes);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+void* dlmemalign(size_t alignment, size_t bytes) {
|
|
|
+ return internal_memalign(gm, alignment, bytes);
|
|
|
+}
|
|
|
+
|
|
|
+void** dlindependent_calloc(size_t n_elements, size_t elem_size,
|
|
|
+ void* chunks[]) {
|
|
|
+ size_t sz = elem_size; /* serves as 1-element array */
|
|
|
+ return ialloc(gm, n_elements, &sz, 3, chunks);
|
|
|
+}
|
|
|
+
|
|
|
+void** dlindependent_comalloc(size_t n_elements, size_t sizes[],
|
|
|
+ void* chunks[]) {
|
|
|
+ return ialloc(gm, n_elements, sizes, 0, chunks);
|
|
|
+}
|
|
|
+
|
|
|
+void* dlvalloc(size_t bytes) {
|
|
|
+ size_t pagesz;
|
|
|
+ ensure_initialization();
|
|
|
+ pagesz = mparams.page_size;
|
|
|
+ return dlmemalign(pagesz, bytes);
|
|
|
+}
|
|
|
+
|
|
|
+void* dlpvalloc(size_t bytes) {
|
|
|
+ size_t pagesz;
|
|
|
+ ensure_initialization();
|
|
|
+ pagesz = mparams.page_size;
|
|
|
+ return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE));
|
|
|
+}
|
|
|
+
|
|
|
+int dlmalloc_trim(size_t pad) {
|
|
|
+ int result = 0;
|
|
|
+ ensure_initialization();
|
|
|
+ if (!PREACTION(gm)) {
|
|
|
+ result = sys_trim(gm, pad);
|
|
|
+ POSTACTION(gm);
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+size_t dlmalloc_footprint(void) {
|
|
|
+ return gm->footprint;
|
|
|
+}
|
|
|
+
|
|
|
+size_t dlmalloc_max_footprint(void) {
|
|
|
+ return gm->max_footprint;
|
|
|
+}
|
|
|
+
|
|
|
+#if !NO_MALLINFO
|
|
|
+struct mallinfo dlmallinfo(void) {
|
|
|
+ return internal_mallinfo(gm);
|
|
|
+}
|
|
|
+#endif /* NO_MALLINFO */
|
|
|
+
|
|
|
+void dlmalloc_stats() {
|
|
|
+ internal_malloc_stats(gm);
|
|
|
+}
|
|
|
+
|
|
|
+int dlmallopt(int param_number, int value) {
|
|
|
+ return change_mparam(param_number, value);
|
|
|
+}
|
|
|
+
|
|
|
+#endif /* !ONLY_MSPACES */
|
|
|
+
|
|
|
+size_t dlmalloc_usable_size(void* mem) {
|
|
|
+ if (mem != 0) {
|
|
|
+ mchunkptr p = mem2chunk(mem);
|
|
|
+ if (is_inuse(p))
|
|
|
+ return chunksize(p) - overhead_for(p);
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* ----------------------------- user mspaces ---------------------------- */
|
|
|
+
|
|
|
+#if MSPACES
|
|
|
+
|
|
|
+static mstate init_user_mstate(char* tbase, size_t tsize) {
|
|
|
+ size_t msize = pad_request(sizeof(struct malloc_state));
|
|
|
+ mchunkptr mn;
|
|
|
+ mchunkptr msp = align_as_chunk(tbase);
|
|
|
+ mstate m = (mstate)(chunk2mem(msp));
|
|
|
+ memset(m, 0, msize);
|
|
|
+ INITIAL_LOCK(&m->mutex);
|
|
|
+ msp->head = (msize|INUSE_BITS);
|
|
|
+ m->seg.base = m->least_addr = tbase;
|
|
|
+ m->seg.size = m->footprint = m->max_footprint = tsize;
|
|
|
+ m->magic = mparams.magic;
|
|
|
+ m->release_checks = MAX_RELEASE_CHECK_RATE;
|
|
|
+ m->mflags = mparams.default_mflags;
|
|
|
+ m->extp = 0;
|
|
|
+ m->exts = 0;
|
|
|
+ disable_contiguous(m);
|
|
|
+ init_bins(m);
|
|
|
+ mn = next_chunk(mem2chunk(m));
|
|
|
+ init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE);
|
|
|
+ check_top_chunk(m, m->top);
|
|
|
+ return m;
|
|
|
+}
|
|
|
+
|
|
|
+mspace create_mspace(size_t capacity, int locked) {
|
|
|
+ mstate m = 0;
|
|
|
+ size_t msize;
|
|
|
+ ensure_initialization();
|
|
|
+ msize = pad_request(sizeof(struct malloc_state));
|
|
|
+ if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
|
|
|
+ size_t rs = ((capacity == 0)? mparams.granularity :
|
|
|
+ (capacity + TOP_FOOT_SIZE + msize));
|
|
|
+ size_t tsize = granularity_align(rs);
|
|
|
+ char* tbase = (char*)(CALL_MMAP(tsize));
|
|
|
+ if (tbase != CMFAIL) {
|
|
|
+ m = init_user_mstate(tbase, tsize);
|
|
|
+ m->seg.sflags = USE_MMAP_BIT;
|
|
|
+ set_lock(m, locked);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return (mspace)m;
|
|
|
+}
|
|
|
+
|
|
|
+mspace create_mspace_with_base(void* base, size_t capacity, int locked) {
|
|
|
+ mstate m = 0;
|
|
|
+ size_t msize;
|
|
|
+ ensure_initialization();
|
|
|
+ msize = pad_request(sizeof(struct malloc_state));
|
|
|
+ if (capacity > msize + TOP_FOOT_SIZE &&
|
|
|
+ capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
|
|
|
+ m = init_user_mstate((char*)base, capacity);
|
|
|
+ m->seg.sflags = EXTERN_BIT;
|
|
|
+ set_lock(m, locked);
|
|
|
+ }
|
|
|
+ return (mspace)m;
|
|
|
+}
|
|
|
+
|
|
|
+int mspace_track_large_chunks(mspace msp, int enable) {
|
|
|
+ int ret = 0;
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (!PREACTION(ms)) {
|
|
|
+ if (!use_mmap(ms))
|
|
|
+ ret = 1;
|
|
|
+ if (!enable)
|
|
|
+ enable_mmap(ms);
|
|
|
+ else
|
|
|
+ disable_mmap(ms);
|
|
|
+ POSTACTION(ms);
|
|
|
+ }
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+size_t destroy_mspace(mspace msp) {
|
|
|
+ size_t freed = 0;
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (ok_magic(ms)) {
|
|
|
+ msegmentptr sp = &ms->seg;
|
|
|
+ while (sp != 0) {
|
|
|
+ char* base = sp->base;
|
|
|
+ size_t size = sp->size;
|
|
|
+ flag_t flag = sp->sflags;
|
|
|
+ sp = sp->next;
|
|
|
+ if ((flag & USE_MMAP_BIT) && !(flag & EXTERN_BIT) &&
|
|
|
+ CALL_MUNMAP(base, size) == 0)
|
|
|
+ freed += size;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ }
|
|
|
+ return freed;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ mspace versions of routines are near-clones of the global
|
|
|
+ versions. This is not so nice but better than the alternatives.
|
|
|
+*/
|
|
|
+
|
|
|
+
|
|
|
+void* mspace_malloc(mspace msp, size_t bytes) {
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (!ok_magic(ms)) {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ if (!PREACTION(ms)) {
|
|
|
+ void* mem;
|
|
|
+ size_t nb;
|
|
|
+ if (bytes <= MAX_SMALL_REQUEST) {
|
|
|
+ bindex_t idx;
|
|
|
+ binmap_t smallbits;
|
|
|
+ nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
|
|
|
+ idx = small_index(nb);
|
|
|
+ smallbits = ms->smallmap >> idx;
|
|
|
+
|
|
|
+ if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
|
|
|
+ mchunkptr b, p;
|
|
|
+ idx += ~smallbits & 1; /* Uses next bin if idx empty */
|
|
|
+ b = smallbin_at(ms, idx);
|
|
|
+ p = b->fd;
|
|
|
+ assert(chunksize(p) == small_index2size(idx));
|
|
|
+ unlink_first_small_chunk(ms, b, p, idx);
|
|
|
+ set_inuse_and_pinuse(ms, p, small_index2size(idx));
|
|
|
+ mem = chunk2mem(p);
|
|
|
+ check_malloced_chunk(ms, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+
|
|
|
+ else if (nb > ms->dvsize) {
|
|
|
+ if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
|
|
|
+ mchunkptr b, p, r;
|
|
|
+ size_t rsize;
|
|
|
+ bindex_t i;
|
|
|
+ binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
|
|
|
+ binmap_t leastbit = least_bit(leftbits);
|
|
|
+ compute_bit2idx(leastbit, i);
|
|
|
+ b = smallbin_at(ms, i);
|
|
|
+ p = b->fd;
|
|
|
+ assert(chunksize(p) == small_index2size(i));
|
|
|
+ unlink_first_small_chunk(ms, b, p, i);
|
|
|
+ rsize = small_index2size(i) - nb;
|
|
|
+ /* Fit here cannot be remainderless if 4byte sizes */
|
|
|
+ if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
|
|
|
+ set_inuse_and_pinuse(ms, p, small_index2size(i));
|
|
|
+ else {
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
|
|
|
+ r = chunk_plus_offset(p, nb);
|
|
|
+ set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
+ replace_dv(ms, r, rsize);
|
|
|
+ }
|
|
|
+ mem = chunk2mem(p);
|
|
|
+ check_malloced_chunk(ms, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+
|
|
|
+ else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) {
|
|
|
+ check_malloced_chunk(ms, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else if (bytes >= MAX_REQUEST)
|
|
|
+ nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
|
|
|
+ else {
|
|
|
+ nb = pad_request(bytes);
|
|
|
+ if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) {
|
|
|
+ check_malloced_chunk(ms, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (nb <= ms->dvsize) {
|
|
|
+ size_t rsize = ms->dvsize - nb;
|
|
|
+ mchunkptr p = ms->dv;
|
|
|
+ if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
|
|
|
+ mchunkptr r = ms->dv = chunk_plus_offset(p, nb);
|
|
|
+ ms->dvsize = rsize;
|
|
|
+ set_size_and_pinuse_of_free_chunk(r, rsize);
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
|
|
|
+ }
|
|
|
+ else { /* exhaust dv */
|
|
|
+ size_t dvs = ms->dvsize;
|
|
|
+ ms->dvsize = 0;
|
|
|
+ ms->dv = 0;
|
|
|
+ set_inuse_and_pinuse(ms, p, dvs);
|
|
|
+ }
|
|
|
+ mem = chunk2mem(p);
|
|
|
+ check_malloced_chunk(ms, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+
|
|
|
+ else if (nb < ms->topsize) { /* Split top */
|
|
|
+ size_t rsize = ms->topsize -= nb;
|
|
|
+ mchunkptr p = ms->top;
|
|
|
+ mchunkptr r = ms->top = chunk_plus_offset(p, nb);
|
|
|
+ r->head = rsize | PINUSE_BIT;
|
|
|
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
|
|
|
+ mem = chunk2mem(p);
|
|
|
+ check_top_chunk(ms, ms->top);
|
|
|
+ check_malloced_chunk(ms, mem, nb);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+
|
|
|
+ mem = sys_alloc(ms, nb);
|
|
|
+
|
|
|
+ postaction:
|
|
|
+ POSTACTION(ms);
|
|
|
+ return mem;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+void mspace_free(mspace msp, void* mem) {
|
|
|
+ if (mem != 0) {
|
|
|
+ mchunkptr p = mem2chunk(mem);
|
|
|
+#if FOOTERS
|
|
|
+ mstate fm = get_mstate_for(p);
|
|
|
+ msp = msp; /* placate people compiling -Wunused */
|
|
|
+#else /* FOOTERS */
|
|
|
+ mstate fm = (mstate)msp;
|
|
|
+#endif /* FOOTERS */
|
|
|
+ if (!ok_magic(fm)) {
|
|
|
+ USAGE_ERROR_ACTION(fm, p);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ if (!PREACTION(fm)) {
|
|
|
+ check_inuse_chunk(fm, p);
|
|
|
+ if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {
|
|
|
+ size_t psize = chunksize(p);
|
|
|
+ mchunkptr next = chunk_plus_offset(p, psize);
|
|
|
+ if (!pinuse(p)) {
|
|
|
+ size_t prevsize = p->prev_foot;
|
|
|
+ if (is_mmapped(p)) {
|
|
|
+ psize += prevsize + MMAP_FOOT_PAD;
|
|
|
+ if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
|
|
|
+ fm->footprint -= psize;
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ mchunkptr prev = chunk_minus_offset(p, prevsize);
|
|
|
+ psize += prevsize;
|
|
|
+ p = prev;
|
|
|
+ if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
|
|
|
+ if (p != fm->dv) {
|
|
|
+ unlink_chunk(fm, p, prevsize);
|
|
|
+ }
|
|
|
+ else if ((next->head & INUSE_BITS) == INUSE_BITS) {
|
|
|
+ fm->dvsize = psize;
|
|
|
+ set_free_with_pinuse(p, psize, next);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ goto erroraction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
|
|
|
+ if (!cinuse(next)) { /* consolidate forward */
|
|
|
+ if (next == fm->top) {
|
|
|
+ size_t tsize = fm->topsize += psize;
|
|
|
+ fm->top = p;
|
|
|
+ p->head = tsize | PINUSE_BIT;
|
|
|
+ if (p == fm->dv) {
|
|
|
+ fm->dv = 0;
|
|
|
+ fm->dvsize = 0;
|
|
|
+ }
|
|
|
+ if (should_trim(fm, tsize))
|
|
|
+ sys_trim(fm, 0);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ else if (next == fm->dv) {
|
|
|
+ size_t dsize = fm->dvsize += psize;
|
|
|
+ fm->dv = p;
|
|
|
+ set_size_and_pinuse_of_free_chunk(p, dsize);
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ size_t nsize = chunksize(next);
|
|
|
+ psize += nsize;
|
|
|
+ unlink_chunk(fm, next, nsize);
|
|
|
+ set_size_and_pinuse_of_free_chunk(p, psize);
|
|
|
+ if (p == fm->dv) {
|
|
|
+ fm->dvsize = psize;
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ set_free_with_pinuse(p, psize, next);
|
|
|
+
|
|
|
+ if (is_small(psize)) {
|
|
|
+ insert_small_chunk(fm, p, psize);
|
|
|
+ check_free_chunk(fm, p);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ tchunkptr tp = (tchunkptr)p;
|
|
|
+ insert_large_chunk(fm, tp, psize);
|
|
|
+ check_free_chunk(fm, p);
|
|
|
+ if (--fm->release_checks == 0)
|
|
|
+ release_unused_segments(fm);
|
|
|
+ }
|
|
|
+ goto postaction;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ erroraction:
|
|
|
+ USAGE_ERROR_ACTION(fm, p);
|
|
|
+ postaction:
|
|
|
+ POSTACTION(fm);
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) {
|
|
|
+ void* mem;
|
|
|
+ size_t req = 0;
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (!ok_magic(ms)) {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ if (n_elements != 0) {
|
|
|
+ req = n_elements * elem_size;
|
|
|
+ if (((n_elements | elem_size) & ~(size_t)0xffff) &&
|
|
|
+ (req / n_elements != elem_size))
|
|
|
+ req = MAX_SIZE_T; /* force downstream failure on overflow */
|
|
|
+ }
|
|
|
+ mem = internal_malloc(ms, req);
|
|
|
+ if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
|
|
|
+ memset(mem, 0, req);
|
|
|
+ return mem;
|
|
|
+}
|
|
|
+
|
|
|
+void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) {
|
|
|
+ if (oldmem == 0)
|
|
|
+ return mspace_malloc(msp, bytes);
|
|
|
+#ifdef REALLOC_ZERO_BYTES_FREES
|
|
|
+ if (bytes == 0) {
|
|
|
+ mspace_free(msp, oldmem);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+#endif /* REALLOC_ZERO_BYTES_FREES */
|
|
|
+ else {
|
|
|
+#if FOOTERS
|
|
|
+ mchunkptr p = mem2chunk(oldmem);
|
|
|
+ mstate ms = get_mstate_for(p);
|
|
|
+#else /* FOOTERS */
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+#endif /* FOOTERS */
|
|
|
+ if (!ok_magic(ms)) {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ return internal_realloc(ms, oldmem, bytes);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) {
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (!ok_magic(ms)) {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ return internal_memalign(ms, alignment, bytes);
|
|
|
+}
|
|
|
+
|
|
|
+void** mspace_independent_calloc(mspace msp, size_t n_elements,
|
|
|
+ size_t elem_size, void* chunks[]) {
|
|
|
+ size_t sz = elem_size; /* serves as 1-element array */
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (!ok_magic(ms)) {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ return ialloc(ms, n_elements, &sz, 3, chunks);
|
|
|
+}
|
|
|
+
|
|
|
+void** mspace_independent_comalloc(mspace msp, size_t n_elements,
|
|
|
+ size_t sizes[], void* chunks[]) {
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (!ok_magic(ms)) {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ return ialloc(ms, n_elements, sizes, 0, chunks);
|
|
|
+}
|
|
|
+
|
|
|
+int mspace_trim(mspace msp, size_t pad) {
|
|
|
+ int result = 0;
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (ok_magic(ms)) {
|
|
|
+ if (!PREACTION(ms)) {
|
|
|
+ result = sys_trim(ms, pad);
|
|
|
+ POSTACTION(ms);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+void mspace_malloc_stats(mspace msp) {
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (ok_magic(ms)) {
|
|
|
+ internal_malloc_stats(ms);
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+size_t mspace_footprint(mspace msp) {
|
|
|
+ size_t result = 0;
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (ok_magic(ms)) {
|
|
|
+ result = ms->footprint;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+size_t mspace_max_footprint(mspace msp) {
|
|
|
+ size_t result = 0;
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (ok_magic(ms)) {
|
|
|
+ result = ms->max_footprint;
|
|
|
+ }
|
|
|
+ else {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+#if !NO_MALLINFO
|
|
|
+struct mallinfo mspace_mallinfo(mspace msp) {
|
|
|
+ mstate ms = (mstate)msp;
|
|
|
+ if (!ok_magic(ms)) {
|
|
|
+ USAGE_ERROR_ACTION(ms,ms);
|
|
|
+ }
|
|
|
+ return internal_mallinfo(ms);
|
|
|
+}
|
|
|
+#endif /* NO_MALLINFO */
|
|
|
+
|
|
|
+size_t mspace_usable_size(void* mem) {
|
|
|
+ if (mem != 0) {
|
|
|
+ mchunkptr p = mem2chunk(mem);
|
|
|
+ if (is_inuse(p))
|
|
|
+ return chunksize(p) - overhead_for(p);
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int mspace_mallopt(int param_number, int value) {
|
|
|
+ return change_mparam(param_number, value);
|
|
|
+}
|
|
|
+
|
|
|
+#endif /* MSPACES */
|
|
|
+
|
|
|
+
|
|
|
+/* -------------------- Alternative MORECORE functions ------------------- */
|
|
|
+
|
|
|
+/*
|
|
|
+ Guidelines for creating a custom version of MORECORE:
|
|
|
+
|
|
|
+ * For best performance, MORECORE should allocate in multiples of pagesize.
|
|
|
+ * MORECORE may allocate more memory than requested. (Or even less,
|
|
|
+ but this will usually result in a malloc failure.)
|
|
|
+ * MORECORE must not allocate memory when given argument zero, but
|
|
|
+ instead return one past the end address of memory from previous
|
|
|
+ nonzero call.
|
|
|
+ * For best performance, consecutive calls to MORECORE with positive
|
|
|
+ arguments should return increasing addresses, indicating that
|
|
|
+ space has been contiguously extended.
|
|
|
+ * Even though consecutive calls to MORECORE need not return contiguous
|
|
|
+ addresses, it must be OK for malloc'ed chunks to span multiple
|
|
|
+ regions in those cases where they do happen to be contiguous.
|
|
|
+ * MORECORE need not handle negative arguments -- it may instead
|
|
|
+ just return MFAIL when given negative arguments.
|
|
|
+ Negative arguments are always multiples of pagesize. MORECORE
|
|
|
+ must not misinterpret negative args as large positive unsigned
|
|
|
+ args. You can suppress all such calls from even occurring by defining
|
|
|
+ MORECORE_CANNOT_TRIM,
|
|
|
+
|
|
|
+ As an example alternative MORECORE, here is a custom allocator
|
|
|
+ kindly contributed for pre-OSX macOS. It uses virtually but not
|
|
|
+ necessarily physically contiguous non-paged memory (locked in,
|
|
|
+ present and won't get swapped out). You can use it by uncommenting
|
|
|
+ this section, adding some #includes, and setting up the appropriate
|
|
|
+ defines above:
|
|
|
+
|
|
|
+ #define MORECORE osMoreCore
|
|
|
+
|
|
|
+ There is also a shutdown routine that should somehow be called for
|
|
|
+ cleanup upon program exit.
|
|
|
+
|
|
|
+ #define MAX_POOL_ENTRIES 100
|
|
|
+ #define MINIMUM_MORECORE_SIZE (64 * 1024U)
|
|
|
+ static int next_os_pool;
|
|
|
+ void *our_os_pools[MAX_POOL_ENTRIES];
|
|
|
+
|
|
|
+ void *osMoreCore(int size)
|
|
|
+ {
|
|
|
+ void *ptr = 0;
|
|
|
+ static void *sbrk_top = 0;
|
|
|
+
|
|
|
+ if (size > 0)
|
|
|
+ {
|
|
|
+ if (size < MINIMUM_MORECORE_SIZE)
|
|
|
+ size = MINIMUM_MORECORE_SIZE;
|
|
|
+ if (CurrentExecutionLevel() == kTaskLevel)
|
|
|
+ ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0);
|
|
|
+ if (ptr == 0)
|
|
|
+ {
|
|
|
+ return (void *) MFAIL;
|
|
|
+ }
|
|
|
+ // save ptrs so they can be freed during cleanup
|
|
|
+ our_os_pools[next_os_pool] = ptr;
|
|
|
+ next_os_pool++;
|
|
|
+ ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK);
|
|
|
+ sbrk_top = (char *) ptr + size;
|
|
|
+ return ptr;
|
|
|
+ }
|
|
|
+ else if (size < 0)
|
|
|
+ {
|
|
|
+ // we don't currently support shrink behavior
|
|
|
+ return (void *) MFAIL;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ return sbrk_top;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // cleanup any allocated memory pools
|
|
|
+ // called as last thing before shutting down driver
|
|
|
+
|
|
|
+ void osCleanupMem(void)
|
|
|
+ {
|
|
|
+ void **ptr;
|
|
|
+
|
|
|
+ for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++)
|
|
|
+ if (*ptr)
|
|
|
+ {
|
|
|
+ PoolDeallocate(*ptr);
|
|
|
+ *ptr = 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+*/
|
|
|
+
|
|
|
+
|
|
|
+/* -----------------------------------------------------------------------
|
|
|
+History:
|
|
|
+ V2.8.4 Wed May 27 09:56:23 2009 Doug Lea (dl at gee)
|
|
|
+ * Use zeros instead of prev foot for is_mmapped
|
|
|
+ * Add mspace_track_large_chunks; thanks to Jean Brouwers
|
|
|
+ * Fix set_inuse in internal_realloc; thanks to Jean Brouwers
|
|
|
+ * Fix insufficient sys_alloc padding when using 16byte alignment
|
|
|
+ * Fix bad error check in mspace_footprint
|
|
|
+ * Adaptations for ptmalloc; thanks to Wolfram Gloger.
|
|
|
+ * Reentrant spin locks; thanks to Earl Chew and others
|
|
|
+ * Win32 improvements; thanks to Niall Douglas and Earl Chew
|
|
|
+ * Add NO_SEGMENT_TRAVERSAL and MAX_RELEASE_CHECK_RATE options
|
|
|
+ * Extension hook in malloc_state
|
|
|
+ * Various small adjustments to reduce warnings on some compilers
|
|
|
+ * Various configuration extensions/changes for more platforms. Thanks
|
|
|
+ to all who contributed these.
|
|
|
+
|
|
|
+ V2.8.3 Thu Sep 22 11:16:32 2005 Doug Lea (dl at gee)
|
|
|
+ * Add max_footprint functions
|
|
|
+ * Ensure all appropriate literals are size_t
|
|
|
+ * Fix conditional compilation problem for some #define settings
|
|
|
+ * Avoid concatenating segments with the one provided
|
|
|
+ in create_mspace_with_base
|
|
|
+ * Rename some variables to avoid compiler shadowing warnings
|
|
|
+ * Use explicit lock initialization.
|
|
|
+ * Better handling of sbrk interference.
|
|
|
+ * Simplify and fix segment insertion, trimming and mspace_destroy
|
|
|
+ * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x
|
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+ * Thanks especially to Dennis Flanagan for help on these.
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+
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+ V2.8.2 Sun Jun 12 16:01:10 2005 Doug Lea (dl at gee)
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+ * Fix memalign brace error.
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+
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+ V2.8.1 Wed Jun 8 16:11:46 2005 Doug Lea (dl at gee)
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+ * Fix improper #endif nesting in C++
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+ * Add explicit casts needed for C++
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+
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+ V2.8.0 Mon May 30 14:09:02 2005 Doug Lea (dl at gee)
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+ * Use trees for large bins
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+ * Support mspaces
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+ * Use segments to unify sbrk-based and mmap-based system allocation,
|
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+ removing need for emulation on most platforms without sbrk.
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+ * Default safety checks
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+ * Optional footer checks. Thanks to William Robertson for the idea.
|
|
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+ * Internal code refactoring
|
|
|
+ * Incorporate suggestions and platform-specific changes.
|
|
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+ Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas,
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|
|
+ Aaron Bachmann, Emery Berger, and others.
|
|
|
+ * Speed up non-fastbin processing enough to remove fastbins.
|
|
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+ * Remove useless cfree() to avoid conflicts with other apps.
|
|
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+ * Remove internal memcpy, memset. Compilers handle builtins better.
|
|
|
+ * Remove some options that no one ever used and rename others.
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+
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|
+ V2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
|
|
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+ * Fix malloc_state bitmap array misdeclaration
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+
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+ V2.7.1 Thu Jul 25 10:58:03 2002 Doug Lea (dl at gee)
|
|
|
+ * Allow tuning of FIRST_SORTED_BIN_SIZE
|
|
|
+ * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte.
|
|
|
+ * Better detection and support for non-contiguousness of MORECORE.
|
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|
+ Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger
|
|
|
+ * Bypass most of malloc if no frees. Thanks To Emery Berger.
|
|
|
+ * Fix freeing of old top non-contiguous chunk im sysmalloc.
|
|
|
+ * Raised default trim and map thresholds to 256K.
|
|
|
+ * Fix mmap-related #defines. Thanks to Lubos Lunak.
|
|
|
+ * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield.
|
|
|
+ * Branch-free bin calculation
|
|
|
+ * Default trim and mmap thresholds now 256K.
|
|
|
+
|
|
|
+ V2.7.0 Sun Mar 11 14:14:06 2001 Doug Lea (dl at gee)
|
|
|
+ * Introduce independent_comalloc and independent_calloc.
|
|
|
+ Thanks to Michael Pachos for motivation and help.
|
|
|
+ * Make optional .h file available
|
|
|
+ * Allow > 2GB requests on 32bit systems.
|
|
|
+ * new WIN32 sbrk, mmap, munmap, lock code from <[email protected]>.
|
|
|
+ Thanks also to Andreas Mueller <a.mueller at paradatec.de>,
|
|
|
+ and Anonymous.
|
|
|
+ * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for
|
|
|
+ helping test this.)
|
|
|
+ * memalign: check alignment arg
|
|
|
+ * realloc: don't try to shift chunks backwards, since this
|
|
|
+ leads to more fragmentation in some programs and doesn't
|
|
|
+ seem to help in any others.
|
|
|
+ * Collect all cases in malloc requiring system memory into sysmalloc
|
|
|
+ * Use mmap as backup to sbrk
|
|
|
+ * Place all internal state in malloc_state
|
|
|
+ * Introduce fastbins (although similar to 2.5.1)
|
|
|
+ * Many minor tunings and cosmetic improvements
|
|
|
+ * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK
|
|
|
+ * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS
|
|
|
+ Thanks to Tony E. Bennett <[email protected]> and others.
|
|
|
+ * Include errno.h to support default failure action.
|
|
|
+
|
|
|
+ V2.6.6 Sun Dec 5 07:42:19 1999 Doug Lea (dl at gee)
|
|
|
+ * return null for negative arguments
|
|
|
+ * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com>
|
|
|
+ * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h'
|
|
|
+ (e.g. WIN32 platforms)
|
|
|
+ * Cleanup header file inclusion for WIN32 platforms
|
|
|
+ * Cleanup code to avoid Microsoft Visual C++ compiler complaints
|
|
|
+ * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing
|
|
|
+ memory allocation routines
|
|
|
+ * Set 'malloc_getpagesize' for WIN32 platforms (needs more work)
|
|
|
+ * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to
|
|
|
+ usage of 'assert' in non-WIN32 code
|
|
|
+ * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to
|
|
|
+ avoid infinite loop
|
|
|
+ * Always call 'fREe()' rather than 'free()'
|
|
|
+
|
|
|
+ V2.6.5 Wed Jun 17 15:57:31 1998 Doug Lea (dl at gee)
|
|
|
+ * Fixed ordering problem with boundary-stamping
|
|
|
+
|
|
|
+ V2.6.3 Sun May 19 08:17:58 1996 Doug Lea (dl at gee)
|
|
|
+ * Added pvalloc, as recommended by H.J. Liu
|
|
|
+ * Added 64bit pointer support mainly from Wolfram Gloger
|
|
|
+ * Added anonymously donated WIN32 sbrk emulation
|
|
|
+ * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen
|
|
|
+ * malloc_extend_top: fix mask error that caused wastage after
|
|
|
+ foreign sbrks
|
|
|
+ * Add linux mremap support code from HJ Liu
|
|
|
+
|
|
|
+ V2.6.2 Tue Dec 5 06:52:55 1995 Doug Lea (dl at gee)
|
|
|
+ * Integrated most documentation with the code.
|
|
|
+ * Add support for mmap, with help from
|
|
|
+ Wolfram Gloger ([email protected]).
|
|
|
+ * Use last_remainder in more cases.
|
|
|
+ * Pack bins using idea from [email protected]
|
|
|
+ * Use ordered bins instead of best-fit threshhold
|
|
|
+ * Eliminate block-local decls to simplify tracing and debugging.
|
|
|
+ * Support another case of realloc via move into top
|
|
|
+ * Fix error occuring when initial sbrk_base not word-aligned.
|
|
|
+ * Rely on page size for units instead of SBRK_UNIT to
|
|
|
+ avoid surprises about sbrk alignment conventions.
|
|
|
+ * Add mallinfo, mallopt. Thanks to Raymond Nijssen
|
|
|
+ ([email protected]) for the suggestion.
|
|
|
+ * Add `pad' argument to malloc_trim and top_pad mallopt parameter.
|
|
|
+ * More precautions for cases where other routines call sbrk,
|
|
|
+ courtesy of Wolfram Gloger ([email protected]).
|
|
|
+ * Added macros etc., allowing use in linux libc from
|
|
|
+ H.J. Lu ([email protected])
|
|
|
+ * Inverted this history list
|
|
|
+
|
|
|
+ V2.6.1 Sat Dec 2 14:10:57 1995 Doug Lea (dl at gee)
|
|
|
+ * Re-tuned and fixed to behave more nicely with V2.6.0 changes.
|
|
|
+ * Removed all preallocation code since under current scheme
|
|
|
+ the work required to undo bad preallocations exceeds
|
|
|
+ the work saved in good cases for most test programs.
|
|
|
+ * No longer use return list or unconsolidated bins since
|
|
|
+ no scheme using them consistently outperforms those that don't
|
|
|
+ given above changes.
|
|
|
+ * Use best fit for very large chunks to prevent some worst-cases.
|
|
|
+ * Added some support for debugging
|
|
|
+
|
|
|
+ V2.6.0 Sat Nov 4 07:05:23 1995 Doug Lea (dl at gee)
|
|
|
+ * Removed footers when chunks are in use. Thanks to
|
|
|
+ Paul Wilson ([email protected]) for the suggestion.
|
|
|
+
|
|
|
+ V2.5.4 Wed Nov 1 07:54:51 1995 Doug Lea (dl at gee)
|
|
|
+ * Added malloc_trim, with help from Wolfram Gloger
|
|
|
+ ([email protected]).
|
|
|
+
|
|
|
+ V2.5.3 Tue Apr 26 10:16:01 1994 Doug Lea (dl at g)
|
|
|
+
|
|
|
+ V2.5.2 Tue Apr 5 16:20:40 1994 Doug Lea (dl at g)
|
|
|
+ * realloc: try to expand in both directions
|
|
|
+ * malloc: swap order of clean-bin strategy;
|
|
|
+ * realloc: only conditionally expand backwards
|
|
|
+ * Try not to scavenge used bins
|
|
|
+ * Use bin counts as a guide to preallocation
|
|
|
+ * Occasionally bin return list chunks in first scan
|
|
|
+ * Add a few optimizations from [email protected]
|
|
|
+
|
|
|
+ V2.5.1 Sat Aug 14 15:40:43 1993 Doug Lea (dl at g)
|
|
|
+ * faster bin computation & slightly different binning
|
|
|
+ * merged all consolidations to one part of malloc proper
|
|
|
+ (eliminating old malloc_find_space & malloc_clean_bin)
|
|
|
+ * Scan 2 returns chunks (not just 1)
|
|
|
+ * Propagate failure in realloc if malloc returns 0
|
|
|
+ * Add stuff to allow compilation on non-ANSI compilers
|
|
|
+ from [email protected]
|
|
|
+
|
|
|
+ V2.5 Sat Aug 7 07:41:59 1993 Doug Lea (dl at g.oswego.edu)
|
|
|
+ * removed potential for odd address access in prev_chunk
|
|
|
+ * removed dependency on getpagesize.h
|
|
|
+ * misc cosmetics and a bit more internal documentation
|
|
|
+ * anticosmetics: mangled names in macros to evade debugger strangeness
|
|
|
+ * tested on sparc, hp-700, dec-mips, rs6000
|
|
|
+ with gcc & native cc (hp, dec only) allowing
|
|
|
+ Detlefs & Zorn comparison study (in SIGPLAN Notices.)
|
|
|
+
|
|
|
+ Trial version Fri Aug 28 13:14:29 1992 Doug Lea (dl at g.oswego.edu)
|
|
|
+ * Based loosely on libg++-1.2X malloc. (It retains some of the overall
|
|
|
+ structure of old version, but most details differ.)
|
|
|
+
|
|
|
+*/
|
|
|
+
|
|
|
+#endif
|
Juan Linietsky