freepascal.compiler/compiler/parser.pas

{
    $Id$
    Copyright (c) 1998-2000 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 maxheapsize=0 then
          maxheapsize:=target_info.maxheapsize;
         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;
         oldprocprefix    : string;
         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;
         prev_name          : pstring;
{$ifdef USEEXCEPT}
{$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);
         prev_name:=stringdup(parser_current_file);
         parser_current_file:=filename;
         old_compiled_module:=compiled_module;
       { save symtable state }
         oldsymtablestack:=symtablestack;
         olddefaultsymtablestack:=defaultsymtablestack;
         oldrefsymtable:=refsymtable;
         oldprocprefix:=procprefix;
         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;
         procprefix:='';
         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;
         aktoptprocessor:=initoptprocessor;
         aktspecificoptprocessor:=initspecificoptprocessor;
         aktasmmode:=initasmmode;
         aktinterfacetype:=initinterfacetype;

       { startup scanner, and save in current_module }
         current_scanner:=tscannerfile.Create(filename);
       { 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;
              { 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;
              procprefix:=oldprocprefix;
              move(oldoverloaded_operators,overloaded_operators,sizeof(toverloaded_operators));
              aktlocalswitches:=oldaktlocalswitches;
              aktmoduleswitches:=oldaktmoduleswitches;
              aktalignment:=oldaktalignment;
              aktpackenum:=oldaktpackenum;
              aktmaxfpuregisters:=oldaktmaxfpuregisters;
              aktoutputformat:=oldaktoutputformat;
              aktoptprocessor:=oldaktoptprocessor;
              aktspecificoptprocessor:=oldaktspecificoptprocessor;
              aktasmmode:=oldaktasmmode;
              aktinterfacetype:=oldaktinterfacetype;
              aktfilepos:=oldaktfilepos;
              aktmodeswitches:=oldaktmodeswitches;
              statement_level:=oldstatement_level;
              aktexceptblock:=0;
              exceptblockcounter:=0;
           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);
         parser_current_file:=prev_name^;
         stringdispose(prev_name);
         compiled_module:=old_compiled_module;
{$ifdef USEEXCEPT}
         if longjump_used then
           longjmp(recoverpospointer^,1);
{$endif USEEXCEPT}
      end;

end.
{
  $Log$
  Revision 1.26  2001-11-02 22:58:02  peter
    * procsym definition rewrite

  Revision 1.25  2001/10/25 21:22:35  peter
    * calling convention rewrite

  Revision 1.24  2001/10/23 21:49:42  peter
    * $calling directive and -Cc commandline patch added
      from Pavel Ozerski

  Revision 1.23  2001/10/16 15:10:35  jonas
    * fixed goto/label/try bugs

  Revision 1.22  2001/08/26 13:36:43  florian
    * some cg reorganisation
    * some PPC updates

  Revision 1.21  2001/07/30 20:59:27  peter
    * m68k updates from v10 merged

  Revision 1.20  2001/07/01 20:16:16  peter
    * alignmentinfo record added
    * -Oa argument supports more alignment settings that can be specified
      per type: PROC,LOOP,VARMIN,VARMAX,CONSTMIN,CONSTMAX,RECORDMIN
      RECORDMAX,LOCALMIN,LOCALMAX. It is possible to set the mimimum
      required alignment and the maximum usefull alignment. The final
      alignment will be choosen per variable size dependent on these
      settings

  Revision 1.19  2001/05/19 23:05:19  peter
    * support uses <unit> in <file> construction

  Revision 1.18  2001/05/06 14:49:17  peter
    * ppu object to class rewrite
    * move ppu read and write stuff to fppu

  Revision 1.17  2001/04/18 22:01:54  peter
    * registration of targets and assemblers

  Revision 1.16  2001/04/15 09:48:30  peter
    * fixed crash in labelnode
    * easier detection of goto and label in try blocks

  Revision 1.15  2001/04/13 18:08:37  peter
    * scanner object to class

  Revision 1.14  2001/04/13 01:22:10  peter
    * symtable change to classes
    * range check generation and errors fixed, make cycle DEBUG=1 works
    * memory leaks fixed

  Revision 1.13  2000/12/25 00:07:27  peter
    + new tlinkedlist class (merge of old tstringqueue,tcontainer and
      tlinkedlist objects)

  Revision 1.12  2000/12/24 12:24:38  peter
    * moved preprocessfile into a conditional

  Revision 1.11  2000/11/29 00:30:34  florian
    * unused units removed from uses clause
    * some changes for widestrings

  Revision 1.10  2000/11/12 22:17:46  peter
    * some realname updates for messages

  Revision 1.9  2000/11/04 14:25:20  florian
    + merged Attila's changes for interfaces, not tested yet

  Revision 1.8  2000/10/31 22:02:49  peter
    * symtable splitted, no real code changes

  Revision 1.7  2000/10/14 10:14:51  peter
    * moehrendorf oct 2000 rewrite

  Revision 1.6  2000/10/01 19:48:25  peter
    * lot of compile updates for cg11

  Revision 1.5  2000/09/24 15:06:20  peter
    * use defines.inc

  Revision 1.4  2000/08/27 16:11:51  peter
    * moved some util functions from globals,cobjects to cutils
    * splitted files into finput,fmodule

  Revision 1.3  2000/08/12 15:34:22  peter
    + usedasmsymbollist to check and reset only the used symbols (merged)

  Revision 1.2  2000/07/13 11:32:44  michael
  + removed logs

}