freepascal.compiler/compiler/symconst.pas

{
    Copyright (c) 1998-2002 by Florian Klaempfl, Pierre Muller

    Symbol table constants

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 ****************************************************************************
}
unit symconst;

{$i fpcdefs.inc}

interface

uses
  globtype;

const
  def_alignment     = 4;

  C_alignment       = -1;
  bit_alignment     = -2;
  mac68k_alignment  = -3;

  { if you change one of the following contants, }
  { you have also to change the typinfo unit}
  { and the rtl/i386,template/rttip.inc files    }
  tkUnknown  = 0;
  tkInteger  = 1;
  tkChar     = 2;
  tkEnumeration   = 3;
  tkFloat    = 4;
  tkSet      = 5;
  tkMethod   = 6;
  tkSString  = 7;
  tkString   = tkSString;
  tkLString  = 8;
  tkAString  = 9;
  tkWString  = 10;
  tkVariant  = 11;
  tkArray    = 12;
  tkRecord   = 13;
  tkInterface= 14;
  tkClass    = 15;
  tkObject   = 16;
  tkWChar    = 17;
  tkBool     = 18;
  tkInt64    = 19;
  tkQWord    = 20;
  tkDynArray = 21;
  tkInterfaceCorba = 22;
  tkProcVar  = 23;
  tkUString  = 24;
  tkUChar    = 25;

  otSByte     = 0;
  otUByte     = 1;
  otSWord     = 2;
  otUWord     = 3;
  otSLong     = 4;
  otULong     = 5;
  otSLongLong = 6;
  otULongLong = 7;

  ftSingle   = 0;
  ftDouble   = 1;
  ftExtended = 2;
  ftComp     = 3;
  ftCurr     = 4;
  ftFloat128 = 5;

  mkProcedure= 0;
  mkFunction = 1;
  mkConstructor   = 2;
  mkDestructor    = 3;
  mkClassProcedure= 4;
  mkClassFunction = 5;

  pfvar      = 1;
  pfConst    = 2;
  pfArray    = 4;
  pfAddress  = 8;
  pfReference= 16;
  pfOut      = 32;

  unknown_level         = 0;
  main_program_level    = 1;
  normal_function_level = 2;

  { implicit parameter positions, normal parameters start at 10
    and will increase with 10 for each parameter. The high parameters
    will be inserted with n+1 }
  paranr_parentfp = 1;
  paranr_self = 2;
  paranr_result = 3;
  paranr_vmt = 4;

  { the implicit parameters for Objective-C methods need to come
    after the hidden result parameter }
  paranr_objc_self = 4;
  paranr_objc_cmd = 5;
  { Required to support variations of syscalls on MorphOS }
  paranr_syscall_basesysv = 9;
  paranr_syscall_sysvbase = high(word)-4;
  paranr_syscall_r12base  = high(word)-3;
  paranr_syscall_legacy   = high(word)-2;
  paranr_result_leftright = high(word)-1;

  { prefix for names of class helper procsyms added to regular symtables }
  class_helper_prefix = 'CH$';


type
  { keep this in sync with TIntfFlag in rtl/objpas/typinfo.pp }
  TCompilerIntfFlag = (ifHasGuid,ifDispInterface,ifDispatch,ifHasStrGUID);

  { Deref entry options }
  tdereftype = (deref_nil,
    deref_unit,
    deref_symid,
    deref_defid
  );

  { symbol visibility }
  tvisibility=(
    vis_hidden,
    vis_strictprivate,
    vis_private,
    vis_strictprotected,
    vis_protected,
    vis_public,
    vis_published
  );

  { symbol options }
  tsymoption=(sp_none,
    sp_static,
    sp_hint_deprecated,
    sp_hint_platform,
    sp_hint_library,
    sp_hint_unimplemented,
    sp_has_overloaded,
    sp_internal,  { internal symbol, not reported as unused }
    sp_implicitrename,
    sp_hint_experimental,
    sp_generic_para,
    sp_has_deprecated_msg
  );
  tsymoptions=set of tsymoption;

  { flags for a definition }
  tdefoption=(df_none,
    { type is unique, i.e. declared with type = type <tdef>; }
    df_unique,
    { type is a generic }
    df_generic,
    { type is a specialization of a generic type }
    df_specialization,
    { def has been copied from another def so symtable is not owned }
    df_copied_def
  );
  tdefoptions=set of tdefoption;

  tdefstate=(ds_none,
    ds_vmt_written,
    ds_rtti_table_used,
    ds_init_table_used,
    ds_rtti_table_written,
    ds_init_table_written,
    ds_dwarf_dbg_info_used,
    ds_dwarf_dbg_info_written
  );
  tdefstates=set of tdefstate;

  { tsymlist entry types }
  tsltype = (sl_none,
    sl_load,
    sl_call,
    sl_subscript,
    sl_vec,
    sl_typeconv,
    sl_absolutetype
  );

  { base types for orddef }
  tordtype = (
    uvoid,
    u8bit,u16bit,u32bit,u64bit,
    s8bit,s16bit,s32bit,s64bit,
    pasbool,bool8bit,bool16bit,bool32bit,bool64bit,
    uchar,uwidechar,scurrency
  );

  { string types }
  tstringtype = (
    st_shortstring,
    st_longstring,
    st_ansistring,
    st_widestring,
    st_unicodestring
  );

  tvarianttype = (
    vt_normalvariant,vt_olevariant
  );

  tcallercallee = (callerside,calleeside);

  { basic type for tprocdef and tprocvardef }
  tproctypeoption=(potype_none,
    potype_proginit,     { Program initialization }
    potype_unitinit,     { unit initialization }
    potype_unitfinalize, { unit finalization }
    potype_constructor,  { Procedure is a constructor }
    potype_destructor,   { Procedure is a destructor }
    potype_operator,     { Procedure defines an operator }
    potype_procedure,
    potype_function
  );
  tproctypeoptions=set of tproctypeoption;

  { other options for tprocdef and tprocvardef }
  tprocoption=(po_none,
    po_classmethod,       { class method }
    po_virtualmethod,     { Procedure is a virtual method }
    po_abstractmethod,    { Procedure is an abstract method }
    po_finalmethod,       { Procedure is a final method }
    po_staticmethod,      { static method }
    po_overridingmethod,  { method with override directive }
    po_methodpointer,     { method pointer, only in procvardef, also used for 'with object do' }
    po_interrupt,         { Procedure is an interrupt handler }
    po_iocheck,           { IO checking should be done after a call to the procedure }
    po_assembler,         { Procedure is written in assembler }
    po_msgstr,            { method for string message handling }
    po_msgint,            { method for int message handling }
    po_exports,           { Procedure has export directive (needed for OS/2) }
    po_external,          { Procedure is external (in other object or lib)}
    po_overload,          { procedure is declared with overload directive }
    po_varargs,           { printf like arguments }
    po_internconst,       { procedure has constant evaluator intern }
    { flag that only the address of a method is returned and not a full methodpointer }
    po_addressonly,
    { procedure is exported }
    po_public,
    { calling convention is specified explicitly }
    po_hascallingconvention,
    { reintroduce flag }
    po_reintroduce,
    { location of parameters is given explicitly as it is necessary for some syscall
      conventions like that one of MorphOS }
    po_explicitparaloc,
    { no stackframe will be generated, used by lowlevel assembler like get_frame }
    po_nostackframe,
    po_has_mangledname,
    po_has_public_name,
    po_forward,
    po_global,
    po_has_inlininginfo,
    { The different kind of syscalls on MorphOS }
    po_syscall_legacy,
    po_syscall_sysv,
    po_syscall_basesysv,
    po_syscall_sysvbase,
    po_syscall_r12base,
    po_local,
    { Procedure can be inlined }
    po_inline,
    { Procedure is used for internal compiler calls }
    po_compilerproc,
    { importing }
    po_has_importdll,
    po_has_importname,
    po_kylixlocal,
    po_dispid,
    { weakly linked (i.e., may or may not exist at run time) }
    po_weakexternal,
    { Objective-C method }
    po_objc,
    { enumerator support }
    po_enumerator_movenext,
    { optional Objective-C protocol method }
    po_optional
  );
  tprocoptions=set of tprocoption;

  { options for objects and classes }
  tobjecttyp = (odt_none,
    odt_class,
    odt_object,
    odt_interfacecom,
    odt_interfacecom_property,
    odt_interfacecom_function,
    odt_interfacecorba,
    odt_cppclass,
    odt_dispinterface,
    odt_objcclass,
    odt_objcprotocol,
    odt_objccategory { note that these are changed into odt_class afterwards }
  );

  { Variations in interfaces implementation }
  { Beware, this data is duplicated in the compiler and rtl. }
  { Do not change the order of the fields. }
  tinterfaceentrytype = (etStandard,
    etVirtualMethodResult,
    etStaticMethodResult,
    etFieldValue,
    etVirtualMethodClass,
    etStaticMethodClass,
    etFieldValueClass
  );

  { options for objects and classes }
  tobjectoption=(oo_none,
    oo_is_forward,         { the class is only a forward declared yet }
    oo_is_abstract,        { the class is abstract - only descendants can be used }
    oo_is_sealed,          { the class is sealed - can't have descendants }
    oo_has_virtual,        { the object/class has virtual methods }
    oo_has_private,
    oo_has_protected,
    oo_has_strictprivate,
    oo_has_strictprotected,
    oo_has_constructor,    { the object/class has a constructor }
    oo_has_destructor,     { the object/class has a destructor }
    oo_has_vmt,            { the object/class has a vmt }
    oo_has_msgstr,
    oo_has_msgint,
    oo_can_have_published,{ the class has rtti, i.e. you can publish properties }
    oo_has_default_property,
    oo_has_valid_guid,
    oo_has_enumerator_movenext,
    oo_has_enumerator_current,
    oo_is_external,       { the class is externally implemented (objcclass, cppclass) }
    oo_is_anonymous,      { the class is only formally defined in this module (objcclass x = class; external;) }
    oo_is_classhelper     { objcclasses that represent categories, and Delpi-style class helpers, are marked like this }
  );
  tobjectoptions=set of tobjectoption;

  tarraydefoption=(ado_none,
    ado_IsConvertedPointer,
    ado_IsDynamicArray,
    ado_IsVariant,
    ado_IsConstructor,
    ado_IsArrayOfConst,
    ado_IsConstString,
    ado_IsBitPacked
  );
  tarraydefoptions=set of tarraydefoption;

  { options for properties }
  tpropertyoption=(ppo_none,
    ppo_indexed,
    ppo_defaultproperty,
    ppo_stored,
    ppo_hasparameters,
    ppo_implements,
    ppo_enumerator_current,
    ppo_dispid_read,
    ppo_dispid_write
  );
  tpropertyoptions=set of tpropertyoption;

  { options for variables }
  tvaroption=(vo_none,
    vo_is_external,
    vo_is_dll_var,
    vo_is_thread_var,
    vo_has_local_copy,
    vo_is_const,  { variable is declared as const (parameter) and can't be written to }
    vo_is_public,
    vo_is_high_para,
    vo_is_funcret,
    vo_is_self,
    vo_is_vmt,
    vo_is_result,  { special result variable }
    vo_is_parentfp,
    vo_is_loop_counter, { used to detect assignments to loop counter }
    vo_is_hidden_para,
    vo_has_explicit_paraloc,
    vo_is_syscall_lib,
    vo_has_mangledname,
    vo_is_typed_const,
    vo_is_range_check,
    vo_is_overflow_check,
    vo_is_typinfo_para,
    vo_is_weak_external,
    { Objective-C message selector parameter }
    vo_is_msgsel,
    { first field of variant part of a record }
    vo_is_first_field
  );
  tvaroptions=set of tvaroption;

  { register variable }
  tvarregable=(vr_none,
    vr_intreg,
    vr_fpureg,
    vr_mmreg,
    { does not mean "needs address register", but "if it's a parameter which is }
    { passed by reference, then its address can be put in a register            }
    vr_addr
  );

  { types of the symtables }
  TSymtabletype = (abstracTSymtable,
    globalsymtable,staticsymtable,
    ObjectSymtable,recordsymtable,
    localsymtable,parasymtable,
    withsymtable,stt_excepTSymtable,
    exportedmacrosymtable, localmacrosymtable
  );


  { definition contains the informations about a type }
  tdeftyp = (abstractdef,
    arraydef,recorddef,pointerdef,orddef,
    stringdef,enumdef,procdef,objectdef,errordef,
    filedef,formaldef,setdef,procvardef,floatdef,
    classrefdef,forwarddef,variantdef,undefineddef
  );

  { possible types for symtable entries }
  tsymtyp = (abstractsym,
    staticvarsym,localvarsym,paravarsym,fieldvarsym,
    typesym,procsym,unitsym,constsym,enumsym,
    errorsym,syssym,labelsym,absolutevarsym,propertysym,
    macrosym
  );

  { State of the variable:
     vs_declared: variable has been declared, not initialised
       (e.g. normal variable, out parameter)
     vs_initialised: variable has been declared and is valid
       (e.g. typed constant, var/const parameter)
     vs_read: variable has been read and the read was checked for validity
       (so a warning has been given if necessary)
     vs_read_not_warned: variable has been read, but we didn't warn about
       whether or not the variable was valid
       (e.g. read of global variable -> warn at end of compilation unit if
        the state is vs_read_not_warned, since that means it's only read and
        never written)
     vs_referred_not_inited: variable has been used in length/low/high/@/...
        expression, was not yet initialised and needn't be at that time
        (e.g. length() of a statically allocated array, or sizeof(variable))
     vs_written: variable has been assigned/written to, but not yet read
        (e.g. assigning something to a variable/parameter)
     vs_readwritten: variable has been written to and read from }
  tvarstate=(vs_none,
    vs_declared,vs_initialised,vs_read,vs_read_not_warned,
    vs_referred_not_inited,vs_written,vs_readwritten
  );

  tvarspez = (vs_value,vs_const,vs_var,vs_out);

  absolutetyp = (tovar,toasm,toaddr);

  tconsttyp = (constnone,
    constord,conststring,constreal,
    constset,constpointer,constnil,
    constresourcestring,constwstring,constguid
  );

  { RTTI information to store }
  trttitype = (
    fullrtti,initrtti,
    { Objective-C }
    objcmetartti,objcmetarortti,
    objcclassrtti,objcclassrortti
  );

  { The order is from low priority to high priority,
    Note: the operators > and < are used on this list }
  tequaltype = (
    te_incompatible,
    te_convert_operator,
    te_convert_l5,     { ad infinitum... }
    te_convert_l4,     { and yet even less preferred conversion }
    te_convert_l3,     { even less preferred conversion (possibly with loss of data) }
    te_convert_l2,     { compatible less preferred conversion }
    te_convert_l1,     { compatible conversion     }
    te_equal,          { the definitions are equal }
    te_exact
  );

  tvariantequaltype = (
    tve_incompatible,
    tve_chari64,
    tve_ustring,
    tve_wstring,
    tve_astring,
    tve_sstring,
    tve_boolformal,
    tve_extended,
    tve_dblcurrency,
    tve_single,
    tve_cardinal,
    tve_longint,
    tve_smallint,
    tve_word,
    tve_shortint,
    tve_byte
  );
  tvariantequaltypes = set of tvariantequaltype;

  tdefdbgstatus = (
    dbg_state_unused,
    dbg_state_used,
    dbg_state_writing,
    dbg_state_written,
    dbg_state_queued
  );


const
   inherited_objectoptions : tobjectoptions = [oo_has_virtual,oo_has_private,oo_has_protected,
                oo_has_strictprotected,oo_has_strictprivate,oo_has_constructor,oo_has_destructor,
                oo_can_have_published];
   clearstack_pocalls = [
     pocall_cdecl,pocall_cppdecl,pocall_syscall,pocall_mwpascal
   ];

{$ifdef i386}
   { we only take this into account on i386, on other platforms we always
     push in the same order
   }
   pushleftright_pocalls : tproccalloptions = [pocall_register,pocall_pascal];
{$endif}

     SymTypeName : array[tsymtyp] of string[12] = (
       'abstractsym','globalvar','localvar','paravar','fieldvar',
       'type','proc','unit','const','enum',
       'errorsym','system sym','label','absolutevar','property',
       'macrosym'
     );

     typName : array[tdeftyp] of string[12] = (
       'abstractdef','arraydef','recorddef','pointerdef','orddef',
       'stringdef','enumdef','procdef','objectdef','errordef',
       'filedef','formaldef','setdef','procvardef','floatdef',
       'classrefdef','forwarddef','variantdef','undefineddef'
     );

     EqualTypeName : array[tequaltype] of string[16] = (
       'incompatible','convert_operator','convert_l5','convert_l4','convert_l3','convert_l2',
       'convert_l1','equal','exact'
     );

     visibilityName : array[tvisibility] of string[16] = (
       'hidden','strict private','private','strict protected','protected',
       'public','published'
     );

implementation

end.