freepascal.compiler/compiler/cg386ld.pas

{
    $Id$
    Copyright (c) 1993-98 by Florian Klaempfl

    Generate i386 assembler for load/assignment nodes

    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 cg386ld;
interface

    uses
      tree;

    procedure secondload(var p : ptree);
    procedure secondassignment(var p : ptree);
    procedure secondfuncret(var p : ptree);
    procedure secondarrayconstruct(var p : ptree);


implementation

    uses
      globtype,systems,
      cobjects,verbose,globals,
      symconst,symtable,aasm,types,
      hcodegen,temp_gen,pass_2,
      cpubase,cpuasm,
      cgai386,tgeni386,cg386cnv,cresstr;

{*****************************************************************************
                             SecondLoad
*****************************************************************************}

    procedure secondload(var p : ptree);
      var
         hregister : tregister;
         symtabletype : tsymtabletype;
         i : longint;
         hp : preference;
         s : pasmsymbol;
         popeax : boolean;
         pushed : tpushed;
         hr : treference;

      begin
         simple_loadn:=true;
         reset_reference(p^.location.reference);
         case p^.symtableentry^.typ of
              { this is only for toasm and toaddr }
              absolutesym :
                 begin
                    p^.location.reference.symbol:=nil;
                    if (pabsolutesym(p^.symtableentry)^.abstyp=toaddr) then
                     begin
                       if pabsolutesym(p^.symtableentry)^.absseg then
                        p^.location.reference.segment:=R_FS;
                       p^.location.reference.offset:=pabsolutesym(p^.symtableentry)^.address;
                     end
                    else
                     p^.location.reference.symbol:=newasmsymbol(p^.symtableentry^.mangledname);
                 end;
              constsym:
                begin
                   if pconstsym(p^.symtableentry)^.consttype=constresourcestring then
                     begin
                         pushusedregisters(pushed,$ff);
                         emit_const(A_PUSH,S_L,
                           pconstsym(p^.symtableentry)^.resstrindex);
                         emitcall('FPC_GETRESOURCESTRING');

                         hregister:=getexplicitregister32(R_EAX);
                         emit_reg_reg(A_MOV,S_L,R_EAX,hregister);
                         if gettempansistringreference(hr) then
                           decrstringref(p^.resulttype,hr);
                         emit_reg_ref(A_MOV,S_L,hregister,
                           newreference(hr));
                        ungetregister32(hregister);
                        popusedregisters(pushed);

                        p^.location.loc:=LOC_MEM;
                        p^.location.reference:=hr;
                     end
                   else
                     internalerror(22798);
                end;
              varsym :
                 begin
                    hregister:=R_NO;
                    { C variable }
                    if (vo_is_C_var in pvarsym(p^.symtableentry)^.varoptions) then
                      begin
                         p^.location.reference.symbol:=newasmsymbol(p^.symtableentry^.mangledname);
                      end
                    { DLL variable }
                    else if (vo_is_dll_var in pvarsym(p^.symtableentry)^.varoptions) then
                      begin
                         hregister:=getregister32;
                         p^.location.reference.symbol:=newasmsymbol(p^.symtableentry^.mangledname);
                         emit_ref_reg(A_MOV,S_L,newreference(p^.location.reference),hregister);
                         p^.location.reference.symbol:=nil;
                         p^.location.reference.base:=hregister;
                      end
                    { external variable }
                    else if (vo_is_external in pvarsym(p^.symtableentry)^.varoptions) then
                      begin
                         p^.location.reference.symbol:=newasmsymbol(p^.symtableentry^.mangledname);
                      end
                    { thread variable }
                    else if (vo_is_thread_var in pvarsym(p^.symtableentry)^.varoptions) then
                      begin
                         popeax:=not(R_EAX in unused);
                         if popeax then
                           emit_reg(A_PUSH,S_L,R_EAX);
                         p^.location.reference.symbol:=newasmsymbol(p^.symtableentry^.mangledname);
                         emit_ref(A_PUSH,S_L,newreference(p^.location.reference));
                         { the called procedure isn't allowed to change }
                         { any register except EAX                    }
                         emitcall('FPC_RELOCATE_THREADVAR');

                         reset_reference(p^.location.reference);
                         p^.location.reference.base:=getregister32;
                         emit_reg_reg(A_MOV,S_L,R_EAX,p^.location.reference.base);
                         if popeax then
                           emit_reg(A_POP,S_L,R_EAX);

                      end
                    { normal variable }
                    else
                      begin
                         symtabletype:=p^.symtable^.symtabletype;
                         { in case it is a register variable: }
                         if pvarsym(p^.symtableentry)^.reg<>R_NO then
                           begin
                              if pvarsym(p^.symtableentry)^.reg in [R_ST0..R_ST7] then
                                begin
                                   p^.location.loc:=LOC_CFPUREGISTER;
                                   p^.location.register:=pvarsym(p^.symtableentry)^.reg;
                                end
                              else
                                begin
                                   p^.location.loc:=LOC_CREGISTER;
                                   p^.location.register:=pvarsym(p^.symtableentry)^.reg;
                                   unused:=unused-[pvarsym(p^.symtableentry)^.reg];
                                end;
                           end
                         else
                           begin
                              { first handle local and temporary variables }
                              if (symtabletype in [parasymtable,inlinelocalsymtable,
                                                   inlineparasymtable,localsymtable]) then
                                begin
                                   p^.location.reference.base:=procinfo.framepointer;
                                   p^.location.reference.offset:=pvarsym(p^.symtableentry)^.address+p^.symtable^.address_fixup;

                                   if (symtabletype in [localsymtable,inlinelocalsymtable]) then
                                     begin
                                        if use_esp_stackframe then
                                          dec(p^.location.reference.offset,
                                            pvarsym(p^.symtableentry)^.getsize)
                                        else
                                          p^.location.reference.offset:=-p^.location.reference.offset;
                                     end;
                                   if (lexlevel>(p^.symtable^.symtablelevel)) then
                                     begin
                                        hregister:=getregister32;

                                        { make a reference }
                                        hp:=new_reference(procinfo.framepointer,
                                          procinfo.framepointer_offset);

                                        emit_ref_reg(A_MOV,S_L,hp,hregister);

                                        simple_loadn:=false;
                                        i:=lexlevel-1;
                                        while i>(p^.symtable^.symtablelevel) do
                                          begin
                                             { make a reference }
                                             hp:=new_reference(hregister,8);
                                             emit_ref_reg(A_MOV,S_L,hp,hregister);
                                             dec(i);
                                          end;
                                        p^.location.reference.base:=hregister;
                                     end;
                                end
                              else
                                case symtabletype of
                                   unitsymtable,globalsymtable,
                                   staticsymtable :
                                     begin
                                       p^.location.reference.symbol:=newasmsymbol(p^.symtableentry^.mangledname);
                                     end;
                                   stt_exceptsymtable:
                                     begin
                                        p^.location.reference.base:=procinfo.framepointer;
                                        p^.location.reference.offset:=pvarsym(p^.symtableentry)^.address;
                                     end;
                                   objectsymtable:
                                     begin
                                        if (sp_static in pvarsym(p^.symtableentry)^.symoptions) then
                                          begin
                                             p^.location.reference.symbol:=newasmsymbol(p^.symtableentry^.mangledname);
                                          end
                                        else
                                          begin
                                             p^.location.reference.base:=R_ESI;
                                             p^.location.reference.offset:=pvarsym(p^.symtableentry)^.address;
                                          end;
                                     end;
                                   withsymtable:
                                     begin
                                        { make a reference }
                                        { symtable datasize field
                                          contains the offset of the temp
                                          stored }
{                                       hp:=new_reference(procinfo.framepointer,
                                          p^.symtable^.datasize);

                                        emit_ref_reg(A_MOV,S_L,hp,hregister);}

                                        if ptree(pwithsymtable(p^.symtable)^.withnode)^.islocal then
                                         begin
                                           p^.location.reference:=ptree(pwithsymtable(p^.symtable)^.withnode)^.withreference^;
                                         end
                                        else
                                         begin
                                           hregister:=getregister32;
                                           p^.location.reference.base:=hregister;
                                           emit_ref_reg(A_MOV,S_L,
                                             newreference(ptree(pwithsymtable(p^.symtable)^.withnode)^.withreference^),
                                             hregister);
                                         end;
                                        inc(p^.location.reference.offset,pvarsym(p^.symtableentry)^.address);
                                     end;
                                end;
                           end;
                         { in case call by reference, then calculate. Open array
                           is always an reference! }
                         if (pvarsym(p^.symtableentry)^.varspez=vs_var) or
                            is_open_array(pvarsym(p^.symtableentry)^.definition) or
                            is_array_of_const(pvarsym(p^.symtableentry)^.definition) or
                            ((pvarsym(p^.symtableentry)^.varspez=vs_const) and
                             push_addr_param(pvarsym(p^.symtableentry)^.definition)) then
                           begin
                              simple_loadn:=false;
                              if hregister=R_NO then
                                hregister:=getregister32;
                              if p^.location.loc=LOC_CREGISTER then
                                begin
                                   emit_reg_reg(A_MOV,S_L,
                                     p^.location.register,hregister);
                                   p^.location.loc:=LOC_REFERENCE;
                                end
                              else
                                begin
                                   emit_ref_reg(A_MOV,S_L,
                                     newreference(p^.location.reference),
                                     hregister);
                                end;
                              reset_reference(p^.location.reference);
                              p^.location.reference.base:=hregister;
                          end;
                      end;
                 end;
              procsym:
                 begin
                    if assigned(p^.left) then
                      begin
                         secondpass(p^.left);
                         p^.location.loc:=LOC_MEM;
                         gettempofsizereference(8,p^.location.reference);

                         { load class instance address }
                         case p^.left^.location.loc of

                            LOC_CREGISTER,
                            LOC_REGISTER:
                              begin
                                 hregister:=p^.left^.location.register;
                                 ungetregister32(p^.left^.location.register);
                                 { such code is allowed !
                                   CGMessage(cg_e_illegal_expression); }
                              end;

                            LOC_MEM,
                            LOC_REFERENCE:
                              begin
                                 hregister:=R_EDI;
                                 emit_ref_reg(A_MOV,S_L,
                                   newreference(p^.left^.location.reference),R_EDI);
                                 del_reference(p^.left^.location.reference);
                                 ungetiftemp(p^.left^.location.reference);
                              end;
                            else internalerror(26019);
                         end;

                         { store the class instance address }
                         new(hp);
                         hp^:=p^.location.reference;
                         inc(hp^.offset,4);
                         emit_reg_ref(A_MOV,S_L,
                           hregister,hp);

                         { virtual method ? }
                         if (po_virtualmethod in pprocsym(p^.symtableentry)^.definition^.procoptions) then
                           begin
                              new(hp);
                              reset_reference(hp^);
                              hp^.base:=hregister;
                              { load vmt pointer }
                              emit_ref_reg(A_MOV,S_L,
                                hp,R_EDI);
{$IfDef regallocfix}
                              del_reference(hp^);
{$EndIf regallocfix}
                              { load method address }
                              new(hp);
                              reset_reference(hp^);
                              hp^.base:=R_EDI;
                              hp^.offset:=pprocsym(p^.symtableentry)^.definition^._class^.vmtmethodoffset(
                                pprocsym(p^.symtableentry)^.definition^.extnumber);
                              emit_ref_reg(A_MOV,S_L,
                                hp,R_EDI);
                              { ... and store it }
                              emit_reg_ref(A_MOV,S_L,
                                R_EDI,newreference(p^.location.reference));
                           end
                         else
                           begin
                              s:=newasmsymbol(pprocsym(p^.symtableentry)^.definition^.mangledname);
                              emit_sym_ofs_ref(A_MOV,S_L,s,0,
                                newreference(p^.location.reference));
                           end;
                      end
                    else
                      begin
                         {!!!!! Be aware, work on virtual methods too }
                         p^.location.reference.symbol:=newasmsymbol(pprocsym(p^.symtableentry)^.definition^.mangledname);
                      end;
                 end;
              typedconstsym :
                 begin
                    p^.location.reference.symbol:=newasmsymbol(p^.symtableentry^.mangledname);
                 end;
              else internalerror(4);
         end;
      end;


{*****************************************************************************
                             SecondAssignment
*****************************************************************************}

    procedure secondassignment(var p : ptree);
      var
         opsize : topsize;
         otlabel,hlabel,oflabel : pasmlabel;
         hregister : tregister;
         fputyp : tfloattype;
         loc : tloc;
         r : preference;
         ai : pai386;
         op : tasmop;
      begin
         otlabel:=truelabel;
         oflabel:=falselabel;
         getlabel(truelabel);
         getlabel(falselabel);
         { calculate left sides }
         if not(p^.concat_string) then
           secondpass(p^.left);

         if codegenerror then
           exit;

         case p^.left^.location.loc of
            LOC_REFERENCE : begin
                              { in case left operator uses to register }
                              { but to few are free then LEA }
                              if (p^.left^.location.reference.base<>R_NO) and
                                 (p^.left^.location.reference.index<>R_NO) and
                                 (usablereg32<p^.right^.registers32) then
                                begin
                                   del_reference(p^.left^.location.reference);
                                   hregister:=getregister32;
                                   emit_ref_reg(A_LEA,S_L,newreference(
                                     p^.left^.location.reference),
                                     hregister);
                                   reset_reference(p^.left^.location.reference);
                                   p^.left^.location.reference.base:=hregister;
                                   p^.left^.location.reference.index:=R_NO;
                                end;
                              loc:=LOC_REFERENCE;
                           end;
            LOC_CFPUREGISTER:
              loc:=LOC_CFPUREGISTER;
            LOC_CREGISTER:
              loc:=LOC_CREGISTER;
            LOC_MMXREGISTER:
              loc:=LOC_MMXREGISTER;
            LOC_CMMXREGISTER:
              loc:=LOC_CMMXREGISTER;
            else
               begin
                  CGMessage(cg_e_illegal_expression);
                  exit;
               end;
         end;
         { lets try to optimize this (PM)            }
         { define a dest_loc that is the location      }
         { and a ptree to verify that it is the right }
         { place to insert it                    }
{$ifdef test_dest_loc}
         if (aktexprlevel<4) then
           begin
              dest_loc_known:=true;
              dest_loc:=p^.left^.location;
              dest_loc_tree:=p^.right;
           end;
{$endif test_dest_loc}

         secondpass(p^.right);
         if codegenerror then
           exit;

{$ifdef test_dest_loc}
         dest_loc_known:=false;
         if in_dest_loc then
           begin
              truelabel:=otlabel;
              falselabel:=oflabel;
              in_dest_loc:=false;
              exit;
           end;
{$endif test_dest_loc}
         if p^.left^.resulttype^.deftype=stringdef then
           begin
              if is_ansistring(p^.left^.resulttype) then
                begin
                  { the source and destinations are released
                    in loadansistring, because an ansi string can
                    also be in a register
                  }
                  loadansistring(p);
                end
              else
              if is_shortstring(p^.left^.resulttype) and
                not (p^.concat_string) then
                begin
                  if is_ansistring(p^.right^.resulttype) then
                    begin
                      if (p^.right^.treetype=stringconstn) and
                         (p^.right^.length=0) then
                        begin
                          emit_const_ref(A_MOV,S_B,
                            0,newreference(p^.left^.location.reference));
{$IfDef regallocfix}
                          del_reference(p^.left^.location.reference);
{$EndIf regallocfix}
                        end
                      else
                        loadansi2short(p^.right,p^.left);
                    end
                  else
                    begin
                       { we do not need destination anymore }
                       del_reference(p^.left^.location.reference);
                       del_reference(p^.right^.location.reference);
                       loadshortstring(p);
                       ungetiftemp(p^.right^.location.reference);
                    end;
                end
              else if is_longstring(p^.left^.resulttype) then
                begin
                end
              else
                begin
                  { its the only thing we have to do }
                  del_reference(p^.right^.location.reference);
                end
           end
        else case p^.right^.location.loc of
            LOC_REFERENCE,
            LOC_MEM : begin
                         { extra handling for ordinal constants }
                         if (p^.right^.treetype in [ordconstn,fixconstn]) or
                            (loc=LOC_CREGISTER) then
                           begin
                              case p^.left^.resulttype^.size of
                                 1 : opsize:=S_B;
                                 2 : opsize:=S_W;
                                 4 : opsize:=S_L;
                                 { S_L is correct, the copy is done }
                                 { with two moves                   }
                                 8 : opsize:=S_L;
                              end;
                              if loc=LOC_CREGISTER then
                                begin
                                  emit_ref_reg(A_MOV,opsize,
                                    newreference(p^.right^.location.reference),
                                    p^.left^.location.register);
                                  if is_64bitint(p^.right^.resulttype) then
                                    begin
                                       r:=newreference(p^.right^.location.reference);
                                       inc(r^.offset,4);
                                       emit_ref_reg(A_MOV,opsize,r,
                                         p^.left^.location.registerhigh);
                                    end;
{$IfDef regallocfix}
                                  del_reference(p^.right^.location.reference);
{$EndIf regallocfix}
                                end
                              else
                                begin
                                  emit_const_ref(A_MOV,opsize,
                                    p^.right^.location.reference.offset,
                                    newreference(p^.left^.location.reference));
                                  if is_64bitint(p^.right^.resulttype) then
                                    begin
                                       r:=newreference(p^.left^.location.reference);
                                       inc(r^.offset,4);
                                       emit_const_ref(A_MOV,opsize,
                                         0,r);
                                    end;
{$IfDef regallocfix}
                                  del_reference(p^.left^.location.reference);
{$EndIf regallocfix}
                                {emit_const_loc(A_MOV,opsize,
                                    p^.right^.location.reference.offset,
                                    p^.left^.location);}
                                end;

                           end
                         else if loc=LOC_CFPUREGISTER then
                           begin
                              floatloadops(pfloatdef(p^.right^.resulttype)^.typ,op,opsize);
                              emit_ref(op,opsize,
                                newreference(p^.right^.location.reference));
                              emit_reg(A_FSTP,S_NO,
                                correct_fpuregister(p^.left^.location.register,fpuvaroffset+1));
                           end
                         else
                           begin
                              if (p^.right^.resulttype^.needs_inittable) and
                                ( (p^.right^.resulttype^.deftype<>objectdef) or
                                  not(pobjectdef(p^.right^.resulttype)^.is_class)) then
                                begin
                                   { this would be a problem }
                                   if not(p^.left^.resulttype^.needs_inittable) then
                                     internalerror(3457);

                                   { increment source reference counter }
                                   new(r);
                                   reset_reference(r^);
                                   r^.symbol:=p^.right^.resulttype^.get_inittable_label;
                                   emitpushreferenceaddr(r^);

                                   emitpushreferenceaddr(p^.right^.location.reference);
                                   emitcall('FPC_ADDREF');
                                   { decrement destination reference counter }
                                   new(r);
                                   reset_reference(r^);
                                   r^.symbol:=p^.left^.resulttype^.get_inittable_label;
                                   emitpushreferenceaddr(r^);
                                   emitpushreferenceaddr(p^.left^.location.reference);
                                   emitcall('FPC_DECREF');
                                end;

{$ifdef regallocfix}
                              concatcopy(p^.right^.location.reference,
                                p^.left^.location.reference,p^.left^.resulttype^.size,true,false);
                              ungetiftemp(p^.right^.location.reference);
{$Else regallocfix}
                              concatcopy(p^.right^.location.reference,
                                p^.left^.location.reference,p^.left^.resulttype^.size,false,false);
                              ungetiftemp(p^.right^.location.reference);
{$endif regallocfix}
                           end;
                      end;
{$ifdef SUPPORT_MMX}
            LOC_CMMXREGISTER,
            LOC_MMXREGISTER:
              begin
                 if loc=LOC_CMMXREGISTER then
                   emit_reg_reg(A_MOVQ,S_NO,
                   p^.right^.location.register,p^.left^.location.register)
                 else
                   emit_reg_ref(A_MOVQ,S_NO,
                     p^.right^.location.register,newreference(p^.left^.location.reference));
              end;
{$endif SUPPORT_MMX}
            LOC_REGISTER,
            LOC_CREGISTER : begin
                              case p^.right^.resulttype^.size of
                                 1 : opsize:=S_B;
                                 2 : opsize:=S_W;
                                 4 : opsize:=S_L;
                                 8 : opsize:=S_L;
                              end;
                              { simplified with op_reg_loc       }
                              if loc=LOC_CREGISTER then
                                begin
                                  emit_reg_reg(A_MOV,opsize,
                                    p^.right^.location.register,
                                    p^.left^.location.register);
{$IfDef regallocfix}
                                 ungetregister(p^.right^.location.register);
{$EndIf regallocfix}
                                end
                              else
                                Begin
                                  emit_reg_ref(A_MOV,opsize,
                                    p^.right^.location.register,
                                    newreference(p^.left^.location.reference));
{$IfDef regallocfix}
                                  ungetregister(p^.right^.location.register);
                                  del_reference(p^.left^.location.reference);
{$EndIf regallocfix}
                                end;
                              if is_64bitint(p^.right^.resulttype) then
                                begin
                                   { simplified with op_reg_loc  }
                                   if loc=LOC_CREGISTER then
                                     emit_reg_reg(A_MOV,opsize,
                                       p^.right^.location.registerhigh,
                                       p^.left^.location.registerhigh)
                                   else
                                     begin
                                        r:=newreference(p^.left^.location.reference);
                                        inc(r^.offset,4);
                                        emit_reg_ref(A_MOV,opsize,
                                          p^.right^.location.registerhigh,r);
                                     end;
                                end;
                              {emit_reg_loc(A_MOV,opsize,
                                  p^.right^.location.register,
                                  p^.left^.location);      }

                           end;
            LOC_FPU : begin
                              if (p^.left^.resulttype^.deftype=floatdef) then
                               fputyp:=pfloatdef(p^.left^.resulttype)^.typ
                              else
                               if (p^.right^.resulttype^.deftype=floatdef) then
                                fputyp:=pfloatdef(p^.right^.resulttype)^.typ
                              else
                               if (p^.right^.treetype=typeconvn) and
                                  (p^.right^.left^.resulttype^.deftype=floatdef) then
                                fputyp:=pfloatdef(p^.right^.left^.resulttype)^.typ
                              else
                                fputyp:=s32real;
                              case loc of
                                 LOC_CFPUREGISTER:
                                   begin
                                      emit_reg(A_FSTP,S_NO,
                                        correct_fpuregister(p^.left^.location.register,fpuvaroffset));
                                      dec(fpuvaroffset);
                                   end;
                                 LOC_REFERENCE:
                                   floatstore(fputyp,p^.left^.location.reference);
                                 else
                                   internalerror(48991);
                              end;
                           end;
            LOC_CFPUREGISTER: begin
                              if (p^.left^.resulttype^.deftype=floatdef) then
                               fputyp:=pfloatdef(p^.left^.resulttype)^.typ
                              else
                               if (p^.right^.resulttype^.deftype=floatdef) then
                                fputyp:=pfloatdef(p^.right^.resulttype)^.typ
                              else
                               if (p^.right^.treetype=typeconvn) and
                                  (p^.right^.left^.resulttype^.deftype=floatdef) then
                                fputyp:=pfloatdef(p^.right^.left^.resulttype)^.typ
                              else
                                fputyp:=s32real;
                              emit_reg(A_FLD,S_NO,
                                correct_fpuregister(p^.right^.location.register,fpuvaroffset));
                              inc(fpuvaroffset);
                              case loc of
                                 LOC_CFPUREGISTER:
                                   begin
                                      emit_reg(A_FSTP,S_NO,
                                        correct_fpuregister(p^.right^.location.register,fpuvaroffset));
                                      dec(fpuvaroffset);
                                   end;
                                 LOC_REFERENCE:
                                   floatstore(fputyp,p^.left^.location.reference);
                                 else
                                   internalerror(48992);
                              end;
                           end;
            LOC_JUMP     : begin
                              getlabel(hlabel);
                              emitlab(truelabel);
                              if loc=LOC_CREGISTER then
                                emit_const_reg(A_MOV,S_B,
                                  1,p^.left^.location.register)
                              else
                                emit_const_ref(A_MOV,S_B,
                                  1,newreference(p^.left^.location.reference));
                              {emit_const_loc(A_MOV,S_B,
                                  1,p^.left^.location);}
                              emitjmp(C_None,hlabel);
                              emitlab(falselabel);
                              if loc=LOC_CREGISTER then
                                emit_reg_reg(A_XOR,S_B,
                                  p^.left^.location.register,
                                  p^.left^.location.register)
                              else
                                begin
                                  emit_const_ref(A_MOV,S_B,
                                    0,newreference(p^.left^.location.reference));
{$IfDef regallocfix}
                                  del_reference(p^.left^.location.reference);
{$EndIf regallocfix}
                                 end;
                              emitlab(hlabel);
                           end;
            LOC_FLAGS    : begin
                              if loc=LOC_CREGISTER then
                                emit_flag2reg(p^.right^.location.resflags,p^.left^.location.register)
                              else
                                begin
                                  ai:=new(pai386,op_ref(A_Setcc,S_B,newreference(p^.left^.location.reference)));
                                  ai^.SetCondition(flag_2_cond[p^.right^.location.resflags]);
                                  exprasmlist^.concat(ai);
                                end;
{$IfDef regallocfix}
                              del_reference(p^.left^.location.reference);
{$EndIf regallocfix}
                           end;
         end;
         freelabel(truelabel);
         freelabel(falselabel);
         truelabel:=otlabel;
         falselabel:=oflabel;
      end;


{*****************************************************************************
                             SecondFuncRet
*****************************************************************************}

    procedure secondfuncret(var p : ptree);
      var
         hr : tregister;
         hp : preference;
         pp : pprocinfo;
         hr_valid : boolean;
      begin
         reset_reference(p^.location.reference);
         hr_valid:=false;
         if @procinfo<>pprocinfo(p^.funcretprocinfo) then
           begin
              hr:=getregister32;
              hr_valid:=true;
              hp:=new_reference(procinfo.framepointer,
                procinfo.framepointer_offset);
              emit_ref_reg(A_MOV,S_L,hp,hr);
              pp:=procinfo.parent;
              { walk up the stack frame }
              while pp<>pprocinfo(p^.funcretprocinfo) do
                begin
                   hp:=new_reference(hr,
                     pp^.framepointer_offset);
                   emit_ref_reg(A_MOV,S_L,hp,hr);
                   pp:=pp^.parent;
                end;
              p^.location.reference.base:=hr;
           end
         else
           p^.location.reference.base:=procinfo.framepointer;
         p^.location.reference.offset:=procinfo.retoffset;
         if ret_in_param(p^.retdef) then
           begin
              if not hr_valid then
                hr:=getregister32;
              emit_ref_reg(A_MOV,S_L,newreference(p^.location.reference),hr);
              p^.location.reference.base:=hr;
              p^.location.reference.offset:=0;
           end;
      end;


{*****************************************************************************
                           SecondArrayConstruct
*****************************************************************************}

      const
        vtInteger    = 0;
        vtBoolean    = 1;
        vtChar       = 2;
        vtExtended   = 3;
        vtString     = 4;
        vtPointer    = 5;
        vtPChar      = 6;
        vtObject     = 7;
        vtClass      = 8;
        vtWideChar   = 9;
        vtPWideChar  = 10;
        vtAnsiString = 11;
        vtCurrency   = 12;
        vtVariant    = 13;
        vtInterface  = 14;
        vtWideString = 15;
        vtInt64      = 16;

    procedure secondarrayconstruct(var p : ptree);
      var
        hp    : ptree;
        href  : treference;
        lt    : pdef;
        vaddr : boolean;
        vtype : longint;
        dovariant : boolean;
        elesize : longint;
      begin
        dovariant:=p^.forcevaria or parraydef(p^.resulttype)^.isvariant;
        if dovariant then
         elesize:=8
        else
         begin
           elesize:=parraydef(p^.resulttype)^.elesize;
           if elesize>4 then
            internalerror(8765678);
         end;
        if not p^.cargs then
         begin
           reset_reference(p^.location.reference);
           { Allocate always a temp, also if no elements are required, to
             be sure that location is valid (PFV) }
            if parraydef(p^.resulttype)^.highrange=-1 then
              gettempofsizereference(elesize,p^.location.reference)
            else
              gettempofsizereference((parraydef(p^.resulttype)^.highrange+1)*elesize,p^.location.reference);
           href:=p^.location.reference;
         end;
        hp:=p;
        while assigned(hp) do
         begin
           if assigned(hp^.left) then
            begin
              secondpass(hp^.left);
              if codegenerror then
               exit;
              if dovariant then
               begin
                 { find the correct vtype value }
                 vtype:=$ff;
                 vaddr:=false;
                 lt:=hp^.left^.resulttype;
                 case lt^.deftype of
                   enumdef,
                   orddef :
                     begin
                       if (lt^.deftype=enumdef) or
                          is_integer(lt) then
                         vtype:=vtInteger
                       else
                         if is_boolean(lt) then
                           vtype:=vtBoolean
                         else
                           if (lt^.deftype=orddef) and (porddef(lt)^.typ=uchar) then
                             vtype:=vtChar;
                     end;
                   floatdef :
                     begin
                       vtype:=vtExtended;
                       vaddr:=true;
                     end;
                   procvardef,
                   pointerdef :
                     begin
                       if is_pchar(lt) then
                         vtype:=vtPChar
                       else
                         vtype:=vtPointer;
                     end;
                   classrefdef :
                     vtype:=vtClass;
                   objectdef :
                     begin
                       vtype:=vtObject;
                     end;
                   stringdef :
                     begin
                       if is_shortstring(lt) then
                        begin
                          vtype:=vtString;
                          vaddr:=true;
                        end
                       else
                        if is_ansistring(lt) then
                         vtype:=vtAnsiString;
                     end;
                 end;
                 if vtype=$ff then
                   internalerror(14357);
                 { write C style pushes or an pascal array }
                 if p^.cargs then
                  begin
                    if vaddr then
                     begin
                       emit_to_reference(hp^.left);
                       emit_push_lea_loc(hp^.left^.location);
                     end
                    else
                     emit_push_loc(hp^.left^.location);
                  end
                 else
                  begin
                    { update href to the vtype field and write it }
                    emit_const_ref(A_MOV,S_L,
                      vtype,newreference(href));
                    inc(href.offset,4);
                    { write changing field update href to the next element }
                    if vaddr then
                     begin
                       emit_to_reference(hp^.left);
                       emit_lea_loc_ref(hp^.left^.location,href);
                     end
                    else
                     emit_mov_loc_ref(hp^.left^.location,href,S_L);
                    inc(href.offset,4);
                  end;
               end
              else
              { normal array constructor of the same type }
               begin
                 case elesize of
                   1 :
                     emit_mov_loc_ref(hp^.left^.location,href,S_B);
                   2 :
                     emit_mov_loc_ref(hp^.left^.location,href,S_W);
                   4 :
                     emit_mov_loc_ref(hp^.left^.location,href,S_L);
                   else
                     internalerror(87656781);
                 end;
                 inc(href.offset,elesize);
               end;
            end;
           { load next entry }
           hp:=hp^.right;
         end;
      end;


end.
{
  $Log$
  Revision 1.76  1999-08-23 11:45:39  michael
  * Hopefully final attempt at resourcestrings

  Revision 1.75  1999/08/19 13:08:49  pierre
   * emit_??? used

  Revision 1.74  1999/08/17 13:26:06  peter
    * arrayconstructor -> arrayofconst fixed when arraycosntructor was not
      variant.

  Revision 1.73  1999/08/13 21:33:09  peter
    * support for array constructors extended and more error checking

  Revision 1.72  1999/08/09 22:19:50  peter
    * classes vmt changed to only positive addresses
    * sharedlib creation is working

  Revision 1.71  1999/08/07 14:20:55  florian
    * some small problems fixed

  Revision 1.70  1999/08/04 13:45:22  florian
    + floating point register variables !!
    * pairegalloc is now generated for register variables

  Revision 1.69  1999/08/04 00:22:50  florian
    * renamed i386asm and i386base to cpuasm and cpubase

  Revision 1.68  1999/08/03 22:02:43  peter
    * moved bitmask constants to sets
    * some other type/const renamings

  Revision 1.67  1999/07/27 23:36:36  peter
    * try to determine the fpu type needed in assignment

  Revision 1.66  1999/07/24 15:12:56  michael
  changes for resourcestrings

  Revision 1.65  1999/07/23 23:09:06  peter
    * resourcestring fix

  Revision 1.64  1999/07/22 09:37:37  florian
    + resourcestring implemented
    + start of longstring support

  Revision 1.63  1999/07/05 20:13:12  peter
    * removed temp defines

  Revision 1.62  1999/06/30 15:43:18  florian
    * two bugs regarding method variables fixed
      - if you take in a method the address of another method
        don't need self anymore
      - if the class pointer was in a register, wrong code for a method
        variable load was generated

  Revision 1.61  1999/06/28 22:29:11  florian
    * qword division fixed
    + code for qword/int64 type casting added:
      range checking isn't implemented yet

  Revision 1.60  1999/05/31 12:42:43  peter
    * fixed crash with empty array constructor

  Revision 1.59  1999/05/27 19:44:14  peter
    * removed oldasm
    * plabel -> pasmlabel
    * -a switches to source writing automaticly
    * assembler readers OOPed
    * asmsymbol automaticly external
    * jumptables and other label fixes for asm readers

  Revision 1.58  1999/05/23 18:42:02  florian
    * better error recovering in typed constants
    * some problems with arrays of const fixed, some problems
      due my previous
       - the location type of array constructor is now LOC_MEM
       - the pushing of high fixed
       - parameter copying fixed
       - zero temp. allocation removed
    * small problem in the assembler writers fixed:
      ref to nil wasn't written correctly

  Revision 1.57  1999/05/21 13:54:51  peter
    * NEWLAB for label as symbol

  Revision 1.56  1999/05/17 23:51:38  peter
    * with temp vars now use a reference with a persistant temp instead
      of setting datasize

  Revision 1.55  1999/05/17 21:57:04  florian
    * new temporary ansistring handling

  Revision 1.54  1999/05/12 00:19:43  peter
    * removed R_DEFAULT_SEG
    * uniform float names

  Revision 1.53  1999/05/06 09:05:16  peter
    * generic write_float and str_float
    * fixed constant float conversions

  Revision 1.52  1999/05/01 13:24:10  peter
    * merged nasm compiler
    * old asm moved to oldasm/

  Revision 1.51  1999/04/28 06:01:55  florian
    * changes of Bruessel:
       + message handler can now take an explicit self
       * typinfo fixed: sometimes the type names weren't written
       * the type checking for pointer comparisations and subtraction
         and are now more strict (was also buggy)
       * small bug fix to link.pas to support compiling on another
         drive
       * probable bug in popt386 fixed: call/jmp => push/jmp
         transformation didn't count correctly the jmp references
       + threadvar support
       * warning if ln/sqrt gets an invalid constant argument

  Revision 1.50  1999/04/16 13:42:26  jonas
    * more regalloc fixes (still not complete)

  Revision 1.49  1999/04/13 18:57:48  florian
    * classes which contain ansistring get unnecessary calls
      to addref/decref when they are assigned, fixed

  Revision 1.48  1999/04/09 15:48:47  jonas
    * added fix for missing register deallocation (-dregallocfix)

  Revision 1.47  1999/03/31 13:55:07  peter
    * assembler inlining working for ag386bin

  Revision 1.46  1999/03/24 23:16:52  peter
    * fixed bugs 212,222,225,227,229,231,233

  Revision 1.45  1999/02/25 21:02:28  peter
    * ag386bin updates
    + coff writer

  Revision 1.44  1999/02/22 02:15:12  peter
    * updates for ag386bin

  Revision 1.43  1999/01/27 00:13:54  florian
    * "procedure of object"-stuff fixed

  Revision 1.42  1999/01/21 22:10:40  peter
    * fixed array of const
    * generic platform independent high() support

  Revision 1.41  1999/01/20 10:20:18  peter
    * don't make localvar copies for assembler procedures

  Revision 1.40  1998/12/30 13:41:07  peter
    * released valuepara

  Revision 1.39  1998/12/19 00:23:45  florian
    * ansistring memory leaks fixed

  Revision 1.38  1998/12/11 00:02:51  peter
    + globtype,tokens,version unit splitted from globals

  Revision 1.37  1998/12/10 09:47:17  florian
    + basic operations with int64/qord (compiler with -dint64)
    + rtti of enumerations extended: names are now written

  Revision 1.36  1998/12/04 10:18:06  florian
    * some stuff for procedures of object added
    * bug with overridden virtual constructors fixed (reported by Italo Gomes)

  Revision 1.35  1998/11/30 09:43:04  pierre
    * some range check bugs fixed (still not working !)
    + added DLL writing support for win32 (also accepts variables)
    + TempAnsi for code that could be used for Temporary ansi strings
      handling

  Revision 1.34  1998/11/28 16:20:48  peter
    + support for dll variables

  Revision 1.33  1998/11/27 14:50:33  peter
    + open strings, $P switch support

  Revision 1.32  1998/11/26 09:53:36  florian
    * for classes no init/final. code is necessary, fixed

  Revision 1.31  1998/11/20 15:35:54  florian
    * problems with rtti fixed, hope it works

  Revision 1.30  1998/11/18 17:45:24  peter
    * fixes for VALUEPARA

  Revision 1.29  1998/11/18 15:44:11  peter
    * VALUEPARA for tp7 compatible value parameters

  Revision 1.28  1998/11/17 11:32:44  peter
    * optimize str:='' in H+ mode
    + -! to test ansistrings

  Revision 1.27  1998/11/16 15:35:39  peter
    * rename laod/copystring -> load/copyshortstring
    * fixed int-bool cnv bug
    + char-ansistring conversion

  Revision 1.26  1998/11/10 10:09:10  peter
    * va_list -> array of const

  Revision 1.25  1998/11/05 12:02:35  peter
    * released useansistring
    * removed -Sv, its now available in fpc modes

  Revision 1.24  1998/10/14 08:47:14  pierre
    * bugs in secondfuncret for result in subprocedures removed

  Revision 1.23  1998/10/06 17:16:44  pierre
    * some memory leaks fixed (thanks to Peter for heaptrc !)

  Revision 1.22  1998/10/01 09:22:53  peter
    * fixed value openarray
    * ungettemp of arrayconstruct

  Revision 1.21  1998/09/28 11:07:39  peter
    + floatdef support for array of const

  Revision 1.20  1998/09/24 14:26:03  peter
    * updated for new tvarrec

  Revision 1.19  1998/09/23 17:49:59  peter
    * high(arrayconstructor) is now correct
    * procvardef support for variant record

  Revision 1.18  1998/09/23 09:58:48  peter
    * first working array of const things

  Revision 1.17  1998/09/20 18:00:19  florian
    * small compiling problems fixed

  Revision 1.16  1998/09/20 17:46:48  florian
    * some things regarding ansistrings fixed

  Revision 1.15  1998/09/17 09:42:16  peter
    + pass_2 for cg386
    * Message() -> CGMessage() for pass_1/pass_2

  Revision 1.14  1998/09/14 10:43:50  peter
    * all internal RTL functions start with FPC_

  Revision 1.13  1998/09/04 12:24:24  florian
    * bug0159 fixed

  Revision 1.12  1998/09/04 11:55:17  florian
    * problem with -Or fixed

  Revision 1.11  1998/09/03 16:03:14  florian
    + rtti generation
    * init table generation changed

  Revision 1.10  1998/08/21 14:08:40  pierre
    + TEST_FUNCRET now default (old code removed)
      works also for m68k (at least compiles)

  Revision 1.9  1998/08/20 09:26:37  pierre
    + funcret setting in underproc testing
      compile with _dTEST_FUNCRET

  Revision 1.8  1998/08/10 14:49:48  peter
    + localswitches, moduleswitches, globalswitches splitting

  Revision 1.7  1998/07/30 13:30:33  florian
    * final implemenation of exception support, maybe it needs
      some fixes :)

  Revision 1.6  1998/07/26 21:58:57  florian
   + better support for switch $H
   + index access to ansi strings added
   + assigment of data (records/arrays) containing ansi strings

  Revision 1.5  1998/07/24 22:16:54  florian
    * internal error 10 together with array access fixed. I hope
      that's the final fix.

  Revision 1.4  1998/06/11 13:58:45  peter
    * fixed too long line

  Revision 1.3  1998/06/09 16:01:35  pierre
    + added procedure directive parsing for procvars
      (accepted are popstack cdecl and pascal)
    + added C vars with the following syntax
      var C calias 'true_c_name';(can be followed by external)
      reason is that you must add the Cprefix

      which is target dependent

  Revision 1.2  1998/06/08 13:13:34  pierre
    + temporary variables now in temp_gen.pas unit
      because it is processor independent
    * mppc68k.bat modified to undefine i386 and support_mmx
      (which are defaults for i386)

  Revision 1.1  1998/06/05 17:44:12  peter
    * splitted cgi386

}