freepascal.compiler/compiler/parser.pas

{
    $Id$
    Copyright (c) 1998-2002 by Florian Klaempfl

    This unit does the parsing process

    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 parser;

{$i defines.inc}

interface

{$ifdef PREPROCWRITE}
    procedure preprocess(const filename:string);
{$endif PREPROCWRITE}
    procedure compile(const filename:string);
    procedure initparser;
    procedure doneparser;

implementation

    uses
      cutils,cclasses,
      globtype,version,tokens,systems,globals,verbose,
      symbase,symtable,symdef,symsym,fmodule,fppu,aasm,
      cgbase,
      script,gendef,
{$ifdef BrowserLog}
      browlog,
{$endif BrowserLog}
{$ifdef UseExcept}
      tpexcept,
{$endif UseExcept}
{$ifdef GDB}
      gdb,
{$endif GDB}
      comphook,
      scanner,scandir,
      pbase,ptype,pmodules,cresstr;


    procedure initparser;
      begin
         { ^M means a string or a char, because we don't parse a }
         { type declaration                                      }
         ignore_equal:=false;

         { we didn't parse a object or class declaration }
         { and no function header                        }
         testcurobject:=0;

         { Symtable }
         aktprocsym:=nil;
         aktprocdef:=nil;

         current_module:=nil;
         compiled_module:=nil;
         procinfo:=nil;

         loaded_units:=TLinkedList.Create;

         usedunits:=TLinkedList.Create;

         { global switches }
         aktglobalswitches:=initglobalswitches;

         { initialize scanner }
         InitScanner;
         InitScannerDirectives;

         { scanner }
         c:=#0;
         pattern:='';
         orgpattern:='';
         current_scanner:=nil;

         { memory sizes }
         if heapsize=0 then
          heapsize:=target_info.heapsize;
         if stacksize=0 then
          stacksize:=target_info.stacksize;

         { open assembler response }
         GenerateAsmRes(outputexedir+'ppas');

         { open deffile }
         DefFile:=TDefFile.Create(outputexedir+inputfile+target_info.defext);

         { list of generated .o files, so the linker can remove them }
         SmartLinkOFiles:=TStringList.Create;
      end;


    procedure doneparser;
      begin
         { unload units }
         loaded_units.free;
         usedunits.free;

         { if there was an error in the scanner, the scanner is
           still assinged }
         if assigned(current_scanner) then
          begin
            current_scanner.free;
            current_scanner:=nil;
          end;

         { close scanner }
         DoneScanner;

         { close ppas,deffile }
         asmres.free;
         deffile.free;

         { free list of .o files }
         SmartLinkOFiles.Free;
      end;


    procedure default_macros;
      var
        hp : tstringlistitem;
      begin
      { commandline }
        hp:=tstringlistitem(initdefines.first);
        while assigned(hp) do
         begin
           current_scanner.def_macro(hp.str);
           hp:=tstringlistitem(hp.next);
         end;
      { set macros for version checking }
        current_scanner.set_macro('FPC_VERSION',version_nr);
        current_scanner.set_macro('FPC_RELEASE',release_nr);
        current_scanner.set_macro('FPC_PATCH',patch_nr);
      end;


{$ifdef PREPROCWRITE}
    procedure preprocess(const filename:string);
      var
        i : longint;
      begin
         new(preprocfile,init('pre'));
       { default macros }
         current_scanner^.macros:=new(pdictionary,init);
         default_macros;
       { initialize a module }
         current_module:=new(pmodule,init(filename,false));
         main_module:=current_module;
       { startup scanner, and save in current_module }
         current_scanner:=new(pscannerfile,Init(filename));
         current_module.scanner:=current_scanner;
       { loop until EOF is found }
         repeat
           current_scanner^.readtoken;
           preprocfile^.AddSpace;
           case token of
             _ID :
               begin
                 preprocfile^.Add(orgpattern);
               end;
             _REALNUMBER,
             _INTCONST :
               preprocfile^.Add(pattern);
             _CSTRING :
               begin
                 i:=0;
                 while (i<length(pattern)) do
                  begin
                    inc(i);
                    if pattern[i]='''' then
                     begin
                       insert('''',pattern,i);
                       inc(i);
                     end;
                  end;
                 preprocfile^.Add(''''+pattern+'''');
               end;
             _CCHAR :
               begin
                 case pattern[1] of
                   #39 :
                     pattern:='''''''';
                   #0..#31,
                   #128..#255 :
                     begin
                       str(ord(pattern[1]),pattern);
                       pattern:='#'+pattern;
                     end;
                   else
                     pattern:=''''+pattern[1]+'''';
                 end;
                 preprocfile^.Add(pattern);
               end;
             _EOF :
               break;
             else
               preprocfile^.Add(tokeninfo^[token].str)
           end;
         until false;
       { free scanner }
         dispose(current_scanner,done);
         current_scanner:=nil;
       { close }
         dispose(preprocfile,done);
      end;
{$endif PREPROCWRITE}


    procedure compile(const filename:string);
      var
       { scanner }
         oldidtoken,
         oldtoken       : ttoken;
         oldtokenpos    : tfileposinfo;
         oldc           : char;
         oldpattern,
         oldorgpattern  : string;
         old_block_type : tblock_type;
         oldcurrent_scanner,prev_scanner,
         scanner : tscannerfile;
       { symtable }
         oldrefsymtable,
         olddefaultsymtablestack,
         oldsymtablestack : tsymtable;
         oldaktprocsym    : tprocsym;
         oldaktprocdef    : tprocdef;
         oldoverloaded_operators : toverloaded_operators;
       { cg }
         oldnextlabelnr : longint;
         oldparse_only  : boolean;
       { asmlists }
         oldimports,
         oldexports,
         oldresource,
         oldrttilist,
         oldresourcestringlist,
         oldbsssegment,
         olddatasegment,
         oldcodesegment,
         oldexprasmlist,
         olddebuglist,
         oldwithdebuglist,
         oldconsts     : taasmoutput;
         oldasmsymbollist : tdictionary;
       { resourcestrings }
         OldResourceStrings : tResourceStrings;
       { akt.. things }
         oldaktlocalswitches  : tlocalswitches;
         oldaktmoduleswitches : tmoduleswitches;
         oldaktfilepos      : tfileposinfo;
         oldaktpackenum,oldaktmaxfpuregisters : longint;
         oldaktalignment  : talignmentinfo;
         oldaktoutputformat : tasm;
         oldaktspecificoptprocessor,
         oldaktoptprocessor : tprocessors;
         oldaktasmmode      : tasmmode;
         oldaktinterfacetype: tinterfacetypes;
         oldaktmodeswitches : tmodeswitches;
         old_compiled_module : tmodule;
         oldaktdefproccall : tproccalloption;
{        will only be increased once we start parsing blocks in the }
{         implementation, so doesn't need to be saved/restored (JM) }
{          oldexceptblockcounter  : integer;                        }
         oldstatement_level : integer;
{$ifdef USEEXCEPT}
{$ifndef Delphi}
         recoverpos    : jmp_buf;
         oldrecoverpos : pjmp_buf;
{$endif Delphi}
{$endif useexcept}
{$ifdef newcg}
         oldcg         : pcg;
{$endif newcg}
{$ifdef GDB}
         store_dbx : plongint;
{$endif GDB}

      begin
         inc(compile_level);
         parser_current_file:=filename;
         old_compiled_module:=compiled_module;
       { save symtable state }
         oldsymtablestack:=symtablestack;
         olddefaultsymtablestack:=defaultsymtablestack;
         oldrefsymtable:=refsymtable;
         oldaktprocsym:=aktprocsym;
         oldaktprocdef:=aktprocdef;
         oldaktdefproccall:=aktdefproccall;
         move(overloaded_operators,oldoverloaded_operators,sizeof(toverloaded_operators));
       { save scanner state }
         oldc:=c;
         oldpattern:=pattern;
         oldorgpattern:=orgpattern;
         oldtoken:=token;
         oldidtoken:=idtoken;
         old_block_type:=block_type;
         oldtokenpos:=akttokenpos;
         oldcurrent_scanner:=current_scanner;
       { save cg }
         oldnextlabelnr:=nextlabelnr;
         oldparse_only:=parse_only;
       { save assembler lists }
         olddatasegment:=datasegment;
         oldbsssegment:=bsssegment;
         oldcodesegment:=codesegment;
         olddebuglist:=debuglist;
         oldwithdebuglist:=withdebuglist;
         oldconsts:=consts;
         oldrttilist:=rttilist;
         oldexprasmlist:=exprasmlist;
         oldimports:=importssection;
         oldexports:=exportssection;
         oldresource:=resourcesection;
         oldresourcestringlist:=resourcestringlist;
         oldasmsymbollist:=asmsymbollist;
         OldResourceStrings:=ResourceStrings;
       { save akt... state }
       { handle the postponed case first }
        if localswitcheschanged then
          begin
            aktlocalswitches:=nextaktlocalswitches;
            localswitcheschanged:=false;
          end;
         oldaktlocalswitches:=aktlocalswitches;
         oldaktmoduleswitches:=aktmoduleswitches;
         oldaktalignment:=aktalignment;
         oldaktpackenum:=aktpackenum;
         oldaktmaxfpuregisters:=aktmaxfpuregisters;
         oldaktoutputformat:=aktoutputformat;
         oldaktoptprocessor:=aktoptprocessor;
         oldaktspecificoptprocessor:=aktspecificoptprocessor;
         oldaktasmmode:=aktasmmode;
         oldaktinterfacetype:=aktinterfacetype;
         oldaktfilepos:=aktfilepos;
         oldaktmodeswitches:=aktmodeswitches;
         oldstatement_level:=statement_level;
{         oldexceptblockcounter:=exceptblockcounter; }
{$ifdef newcg}
         oldcg:=cg;
{$endif newcg}
{$ifdef GDB}
         store_dbx:=dbx_counter;
         dbx_counter:=nil;
{$endif GDB}
       { show info }
         Message1(parser_i_compiling,filename);

       { reset symtable }
         symtablestack:=nil;
         defaultsymtablestack:=nil;
         systemunit:=nil;
         refsymtable:=nil;
         aktprocsym:=nil;
         aktdefproccall:=initdefproccall;
         registerdef:=true;
         statement_level:=0;
         aktexceptblock:=0;
         exceptblockcounter:=0;
         aktmaxfpuregisters:=-1;
         fillchar(overloaded_operators,sizeof(toverloaded_operators),0);
       { reset the unit or create a new program }
         if assigned(current_module) then
           begin
              {current_module.reset this is wrong !! }
               scanner:=tscannerfile(current_module.scanner);
               current_module.reset;
               tscannerfile(current_module.scanner):=scanner;
           end
         else
          begin
            current_module:=tppumodule.create(filename,'',false);
            main_module:=current_module;
          end;

         { a unit compiled at command line must be inside the loaded_unit list }
         if (compile_level=1) then
           loaded_units.insert(current_module);

         { Set the module to use for verbose }
         SetCompileModule(current_module);

         compiled_module:=current_module;
         current_module.in_compile:=true;
       { Load current state from the init values }
         aktlocalswitches:=initlocalswitches;
         aktmoduleswitches:=initmoduleswitches;
         aktmodeswitches:=initmodeswitches;
         {$IFDEF Testvarsets}
         aktsetalloc:=initsetalloc;
         {$ENDIF}
         aktalignment:=initalignment;
         aktpackenum:=initpackenum;
         aktoutputformat:=initoutputformat;
         set_target_asm(aktoutputformat);
         aktoptprocessor:=initoptprocessor;
         aktspecificoptprocessor:=initspecificoptprocessor;
         aktasmmode:=initasmmode;
         aktinterfacetype:=initinterfacetype;

       { startup scanner and load the first file }
         current_scanner:=tscannerfile.Create(filename);
         current_scanner.firstfile;
       { macros }
         default_macros;
       { read the first token }
         current_scanner.readtoken;
         prev_scanner:=tscannerfile(current_module.scanner);
         current_module.scanner:=current_scanner;

       { init code generator for a new module }
         codegen_newmodule;
{$ifdef newcg}
{$ifdef i386}
         cg:=new(pcg386,init);
{$endif i386}
{$ifdef alpha}
         cg:=new(pcgalpha,init);
{$endif alpha}
{$ifdef powerpc}
         cg:=new(pcgppc,init);
{$endif powerpc}
{$endif newcg}

         { If the compile level > 1 we get a nice "unit expected" error
           message if we are trying to use a program as unit.}
{$ifdef USEEXCEPT}
         if setjmp(recoverpos)=0 then
          begin
            oldrecoverpos:=recoverpospointer;
            recoverpospointer:=@recoverpos;
{$endif USEEXCEPT}

            if (token=_UNIT) or (compile_level>1) then
              begin
                current_module.is_unit:=true;
                proc_unit;
              end
            else
              proc_program(token=_LIBRARY);
{$ifdef USEEXCEPT}
            recoverpospointer:=oldrecoverpos;
          end
         else
          begin
            recoverpospointer:=oldrecoverpos;
            longjump_used:=true;
          end;
{$endif USEEXCEPT}

       { clear memory }
{$ifdef Splitheap}
         if testsplit then
           begin
           { temp heap should be empty after that !!!}
             codegen_donemodule;
             Releasetempheap;
           end;
{$endif Splitheap}

       { restore old state, close trees, > 0.99.5 has heapblocks, so
         it's the default to release the trees }
         codegen_donemodule;

{$ifdef newcg}
         dispose(cg,done);
{$endif newcg}

       { free ppu }
         if assigned(tppumodule(current_module).ppufile) then
          begin
            tppumodule(current_module).ppufile.free;
            tppumodule(current_module).ppufile:=nil;
          end;
       { free scanner }
         current_scanner.free;
         current_scanner:=nil;
       { restore previous scanner !! }
         current_module.scanner:=prev_scanner;
         if assigned(prev_scanner) then
           prev_scanner.invalid:=true;

         if (compile_level>1) then
           begin
{$ifdef newcg}
              cg:=oldcg;
{$endif newcg}
{$ifdef GDB}
              dbx_counter:=store_dbx;
{$endif GDB}
              { restore scanner }
              c:=oldc;
              pattern:=oldpattern;
              orgpattern:=oldorgpattern;
              token:=oldtoken;
              idtoken:=oldidtoken;
              akttokenpos:=oldtokenpos;
              block_type:=old_block_type;
              current_scanner:=oldcurrent_scanner;
              parser_current_file:=current_scanner.inputfile.name^;
              { restore cg }
              nextlabelnr:=oldnextlabelnr;
              parse_only:=oldparse_only;
              { restore asmlists }
              exprasmlist:=oldexprasmlist;
              datasegment:=olddatasegment;
              bsssegment:=oldbsssegment;
              codesegment:=oldcodesegment;
              consts:=oldconsts;
              debuglist:=olddebuglist;
              withdebuglist:=oldwithdebuglist;
              importssection:=oldimports;
              exportssection:=oldexports;
              resourcesection:=oldresource;
              rttilist:=oldrttilist;
              resourcestringlist:=oldresourcestringlist;
              asmsymbollist:=oldasmsymbollist;
              ResourceStrings:=OldResourceStrings;
              { restore symtable state }
              refsymtable:=oldrefsymtable;
              symtablestack:=oldsymtablestack;
              defaultsymtablestack:=olddefaultsymtablestack;
              aktdefproccall:=oldaktdefproccall;
              aktprocsym:=oldaktprocsym;
              aktprocdef:=oldaktprocdef;
              move(oldoverloaded_operators,overloaded_operators,sizeof(toverloaded_operators));
              aktlocalswitches:=oldaktlocalswitches;
              aktmoduleswitches:=oldaktmoduleswitches;
              aktalignment:=oldaktalignment;
              aktpackenum:=oldaktpackenum;
              aktmaxfpuregisters:=oldaktmaxfpuregisters;
              aktoutputformat:=oldaktoutputformat;
              set_target_asm(aktoutputformat);
              aktoptprocessor:=oldaktoptprocessor;
              aktspecificoptprocessor:=oldaktspecificoptprocessor;
              aktasmmode:=oldaktasmmode;
              aktinterfacetype:=oldaktinterfacetype;
              aktfilepos:=oldaktfilepos;
              aktmodeswitches:=oldaktmodeswitches;
              statement_level:=oldstatement_level;
              aktexceptblock:=0;
              exceptblockcounter:=0;
           end
         else
           begin
              parser_current_file:='';
           end;

       { Shut down things when the last file is compiled }
         if (compile_level=1) then
          begin
          { Close script }
            if (not AsmRes.Empty) then
             begin
               Message1(exec_i_closing_script,AsmRes.Fn);
               AsmRes.WriteToDisk;
             end;

{$ifdef USEEXCEPT}
            if not longjump_used then
{$endif USEEXCEPT}
            { do not create browsers on errors !! }
            if status.errorcount=0 then
              begin
{$ifdef BrowserLog}
              { Write Browser Log }
              if (cs_browser_log in aktglobalswitches) and
                 (cs_browser in aktmoduleswitches) then
                 begin
                 if browserlog.elements_to_list.empty then
                   begin
                   Message1(parser_i_writing_browser_log,browserlog.Fname);
                   WriteBrowserLog;
                   end
                 else
                  browserlog.list_elements;
                 end;
{$endif BrowserLog}

                 { Write Browser Collections }
                 do_extractsymbolinfo{$ifdef FPC}(){$endif};
              end;

         if current_module.in_second_compile then
           begin
             current_module.in_second_compile:=false;
             current_module.in_compile:=true;
           end
         else
           current_module.in_compile:=false;

          (* Obsolete code aktprocsym
             is disposed by the localsymtable disposal (PM)
          { Free last aktprocsym }
            if assigned(aktprocsym) and (aktprocsym.owner=nil) then
             begin
               { init parts are not needed in units !! }
               if current_module.is_unit then
                 aktprocdef.forwarddef:=false;
               dispose(aktprocsym,done);
             end; *)
          end;

         dec(compile_level);
         compiled_module:=old_compiled_module;
{$ifdef USEEXCEPT}
         if longjump_used then
           longjmp(recoverpospointer^,1);
{$endif USEEXCEPT}
      end;

end.
{
  $Log$
  Revision 1.31  2002-05-14 19:34:43  peter
    * removed old logs and updated copyright year

  Revision 1.30  2002/04/21 18:57:23  peter
    * fixed memleaks when file can't be opened

  Revision 1.29  2002/04/20 21:32:24  carl
  + generic FPC_CHECKPOINTER
  + first parameter offset in stack now portable
  * rename some constants
  + move some cpu stuff to other units
  - remove unused constents
  * fix stacksize for some targets
  * fix generic size problems which depend now on EXTEND_SIZE constant

  Revision 1.28  2002/04/19 15:46:02  peter
    * mangledname rewrite, tprocdef.mangledname is now created dynamicly
      in most cases and not written to the ppu
    * add mangeledname_prefix() routine to generate the prefix of
      manglednames depending on the current procedure, object and module
    * removed static procprefix since the mangledname is now build only
      on demand from tprocdef.mangledname

  Revision 1.27  2002/01/29 19:43:11  peter
    * update target_asm according to outputformat

}