+ added cpupara for 6502

compiler/mos6502/cpubase.pas

@@ -202,8 +202,8 @@ unit cpubase;
       NR_STACK_POINTER_REG = NR_S;
       RS_STACK_POINTER_REG = RS_S;
       { Frame pointer register }
-      //RS_FRAME_POINTER_REG = RS_IX;
-      //NR_FRAME_POINTER_REG = NR_IX;
+      RS_FRAME_POINTER_REG = RS_INVALID;
+      NR_FRAME_POINTER_REG = NR_INVALID;
       { Register for addressing absolute data in a position independant way,
         such as in PIC code. The exact meaning is ABI specific. For
         further information look at GCC source : PIC_OFFSET_TABLE_REGNUM

compiler/mos6502/cpupara.pas

@@ -0,0 +1,533 @@
+{
+    Copyright (c) 2008 by Florian Klaempfl
+
+    6502 specific calling conventions
+
+    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.
+ ****************************************************************************
+}
+{ ARM specific calling conventions are handled by this unit
+}
+unit cpupara;
+
+{$i fpcdefs.inc}
+
+  interface
+
+    uses
+       globtype,globals,
+       aasmtai,aasmdata,
+       cpuinfo,cpubase,cgbase,cgutils,
+       symconst,symbase,symtype,symdef,parabase,paramgr;
+
+    type
+       tcpuparamanager = class(tparamanager)
+          function get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;override;
+          function get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;override;
+          function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
+          function ret_in_param(def:tdef;pd:tabstractprocdef):boolean;override;
+          function create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;override;
+          function create_varargs_paraloc_info(p : tabstractprocdef; side: tcallercallee; varargspara:tvarargsparalist):longint;override;
+          function  get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;override;
+         private
+          procedure init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: longint);
+          function create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
+            var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: longint):longint;
+       end;
+
+  implementation
+
+    uses
+       verbose,systems,
+       rgobj,
+       defutil,symsym;
+
+
+    function tcpuparamanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
+      begin
+        result:=VOLATILE_INTREGISTERS;
+      end;
+
+
+    function tcpuparamanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
+      begin
+        result:=VOLATILE_FPUREGISTERS;
+      end;
+
+
+    function getparaloc_fastcall(calloption : tproccalloption; p : tdef) : tcgloc;
+      begin
+         { Later, the LOC_REFERENCE is in most cases changed into LOC_REGISTER
+           if push_addr_param for the def is true
+         }
+         case p.typ of
+            orddef:
+              result:=LOC_REGISTER;
+            floatdef:
+              result:=LOC_REGISTER;
+            enumdef:
+              result:=LOC_REGISTER;
+            pointerdef:
+              result:=LOC_REGISTER;
+            formaldef:
+              result:=LOC_REGISTER;
+            classrefdef:
+              result:=LOC_REGISTER;
+            recorddef:
+              result:=LOC_REGISTER;
+            objectdef:
+              result:=LOC_REGISTER;
+            stringdef:
+              if is_shortstring(p) or is_longstring(p) then
+                result:=LOC_REFERENCE
+              else
+                result:=LOC_REGISTER;
+            procvardef:
+              result:=LOC_REGISTER;
+            filedef:
+              result:=LOC_REGISTER;
+            arraydef:
+              if is_dynamic_array(p) then
+                result:=LOC_REGISTER
+              else
+                result:=LOC_REFERENCE;
+            setdef:
+              if is_smallset(p) then
+                result:=LOC_REGISTER
+              else
+                result:=LOC_REFERENCE;
+            variantdef:
+              result:=LOC_REGISTER;
+            { avoid problems with errornous definitions }
+            errordef:
+              result:=LOC_REGISTER;
+            else
+              internalerror(2017032603);
+         end;
+      end;
+
+
+    function tcpuparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
+      begin
+        result:=false;
+        if varspez in [vs_var,vs_out,vs_constref] then
+          begin
+            result:=true;
+            exit;
+          end;
+        case def.typ of
+          objectdef:
+            result:=is_object(def) and ((varspez=vs_const) or (def.size=0));
+          recorddef:
+            result:=(varspez=vs_const) or (def.size=0);
+          variantdef,
+          formaldef:
+            result:=true;
+          arraydef:
+            result:=(tarraydef(def).highrange>=tarraydef(def).lowrange) or
+                             is_open_array(def) or
+                             is_array_of_const(def) or
+                             is_array_constructor(def);
+          setdef :
+            result:=not is_smallset(def);
+          stringdef :
+            result:=tstringdef(def).stringtype in [st_shortstring,st_longstring];
+        else
+          result:=def.size>8;
+        end;
+      end;
+
+
+    function tcpuparamanager.ret_in_param(def:tdef;pd:tabstractprocdef):boolean;
+      begin
+        if handle_common_ret_in_param(def,pd,result) then
+          exit;
+        case def.typ of
+          recorddef:
+            { this is how gcc 4.0.4 on linux seems to do it, it doesn't look like being
+              ARM ABI standard compliant
+            }
+            result:=not((trecorddef(def).symtable.SymList.count=1) and
+              not(ret_in_param(tabstractvarsym(trecorddef(def).symtable.SymList[0]).vardef,pd)));
+          {
+          objectdef
+          arraydef:
+            result:=not(def.size in [1,2,4]);
+          }
+          else
+            if def.size>4 then
+              result:=true
+            else
+              result:=inherited ret_in_param(def,pd);
+        end;
+      end;
+
+
+    procedure tcpuparamanager.init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: longint);
+      begin
+        curintreg:=RS_A;
+        curfloatreg:=RS_INVALID;
+        curmmreg:=RS_INVALID;
+        cur_stack_offset:=0;
+      end;
+
+
+    { TODO : fix tcpuparamanager.create_paraloc_info_intern }
+    function tcpuparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
+        var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: longint):longint;
+
+      var
+        nextintreg,nextfloatreg,nextmmreg : tsuperregister;
+        paradef : tdef;
+        paraloc : pcgparalocation;
+        stack_offset : longint;
+        hp : tparavarsym;
+        loc : tcgloc;
+        paracgsize   : tcgsize;
+        paralen : longint;
+        i : integer;
+        firstparaloc: boolean;
+
+      procedure assignintreg;
+        begin
+          { In case of po_delphi_nested_cc, the parent frame pointer
+            is always passed on the stack. }
+           //if false and { no fastcall yet }
+           //   (nextintreg=RS_HL) and
+           //   (not(vo_is_parentfp in hp.varoptions) or
+           //    not(po_delphi_nested_cc in p.procoptions)) then
+           //  begin
+           //    paraloc^.loc:=LOC_REGISTER;
+           //    paraloc^.register:=newreg(R_INTREGISTER,nextintreg-1,R_SUBWHOLE);
+           //    paraloc:=hp.paraloc[side].add_location;
+           //    paraloc^.loc:=LOC_REGISTER;
+           //    paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBWHOLE);
+           //    dec(nextintreg,2);
+           //  end
+           //else
+             begin
+               paraloc^.loc:=LOC_REFERENCE;
+               paraloc^.reference.index:=NR_STACK_POINTER_REG;
+               paraloc^.reference.offset:=stack_offset;
+               inc(stack_offset,2);
+            end;
+        end;
+
+
+      begin
+        result:=0;
+        nextintreg:=curintreg;
+        nextfloatreg:=curfloatreg;
+        nextmmreg:=curmmreg;
+        stack_offset:=cur_stack_offset;
+
+        for i:=0 to paras.count-1 do
+          begin
+            hp:=tparavarsym(paras[i]);
+            paradef:=hp.vardef;
+
+            hp.paraloc[side].reset;
+
+            { currently only support C-style array of const,
+              there should be no location assigned to the vararg array itself }
+            if (p.proccalloption in cstylearrayofconst) and
+               is_array_of_const(paradef) then
+              begin
+                paraloc:=hp.paraloc[side].add_location;
+                { hack: the paraloc must be valid, but is not actually used }
+                paraloc^.loc:=LOC_REGISTER;
+                paraloc^.register:=NR_A;
+                paraloc^.size:=OS_ADDR;
+                paraloc^.def:=voidpointertype;
+                break;
+              end;
+
+            if push_addr_param(hp.varspez,paradef,p.proccalloption) then
+              begin
+                paradef:=cpointerdef.getreusable_no_free(paradef);
+                loc:=LOC_REGISTER;
+                paracgsize:=OS_ADDR;
+                paralen:=tcgsize2size[OS_ADDR];
+              end
+            else
+              begin
+                if not is_special_array(paradef) then
+                  paralen := paradef.size
+                else
+                  paralen := tcgsize2size[def_cgsize(paradef)];
+                // loc := getparaloc(p.proccalloption,paradef);
+                loc:=LOC_REFERENCE;
+                if (paradef.typ in [objectdef,arraydef,recorddef]) and
+                  not is_special_array(paradef) and
+                  (hp.varspez in [vs_value,vs_const]) then
+                  paracgsize := int_cgsize(paralen)
+                else
+                  begin
+                    paracgsize:=def_cgsize(paradef);
+                    { for things like formaldef }
+                    if (paracgsize=OS_NO) then
+                      begin
+                        paracgsize:=OS_ADDR;
+                        paralen:=tcgsize2size[OS_ADDR];
+                        paradef:=voidpointertype;
+                      end;
+                  end
+              end;
+
+             hp.paraloc[side].size:=paracgsize;
+             hp.paraloc[side].Alignment:=std_param_align;
+             hp.paraloc[side].intsize:=paralen;
+             hp.paraloc[side].def:=paradef;
+
+{$ifdef EXTDEBUG}
+             if paralen=0 then
+               internalerror(200410311);
+{$endif EXTDEBUG}
+             firstparaloc:=true;
+             if loc=LOC_REGISTER then
+               begin
+                 { the lsb is located in the register with the lowest number,
+                   by adding paralen mod 2, make the size even
+                 }
+                 nextintreg:=curintreg-(paralen+(paralen mod 2))+1;
+                 if nextintreg>=RS_A then
+                   curintreg:=nextintreg-1
+                 else
+                   begin
+                     curintreg:=RS_A;
+                     loc:=LOC_REFERENCE;
+                   end;
+               end;
+             while paralen>0 do
+               begin
+                 paraloc:=hp.paraloc[side].add_location;
+
+                 if (loc=LOC_REGISTER) and (paracgsize in [OS_F32,OS_F64,OS_F80]) then
+                   case paracgsize of
+                     OS_F32:
+                       begin
+                         paraloc^.size:=OS_32;
+                         paraloc^.def:=u32inttype;
+                       end;
+                     OS_F64:
+                       begin
+                         paraloc^.size:=OS_32;
+                         paraloc^.def:=u32inttype;
+                       end;
+                     else
+                       internalerror(2005082901);
+                   end
+                 else
+                   begin
+                     paraloc^.size:=paracgsize;
+                     paraloc^.def:=paradef;
+                   end;
+                 case loc of
+                    LOC_REGISTER:
+                      begin
+                        if nextintreg>=RS_A then
+                          begin
+                            paraloc^.loc:=LOC_REGISTER;
+                            paraloc^.size:=OS_8;
+                            paraloc^.def:=u8inttype;
+                            paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBWHOLE);
+                            inc(nextintreg);
+                          end
+                        else
+                          { parameters are always passed completely in registers or in memory on Z80 }
+                          internalerror(2015041002);
+                        dec(paralen,tcgsize2size[paraloc^.size]);
+                      end;
+                    LOC_REFERENCE:
+                      begin
+                        if push_addr_param(hp.varspez,paradef,p.proccalloption) then
+                          begin
+                            paraloc^.size:=OS_ADDR;
+                            paraloc^.def:=cpointerdef.getreusable_no_free(paradef);
+                            assignintreg
+                          end
+                        else
+                          begin
+                             paraloc^.def:=paradef;
+                             paraloc^.loc:=LOC_REFERENCE;
+                             paraloc^.reference.index:=NR_STACK_POINTER_REG;
+                             paraloc^.reference.offset:=stack_offset;
+                             inc(stack_offset,paradef.size);
+                          end;
+                        paralen:=0;
+                      end;
+                    else
+                      internalerror(2002071002);
+                 end;
+                 if side=calleeside then
+                   begin
+                     if paraloc^.loc=LOC_REFERENCE then
+                       begin
+                         paraloc^.reference.index:=NR_FRAME_POINTER_REG;
+                         inc(paraloc^.reference.offset,target_info.first_parm_offset);
+                       end;
+                   end;
+                 firstparaloc:=false;
+               end;
+          end;
+        curfloatreg:=nextfloatreg;
+        curmmreg:=nextmmreg;
+        cur_stack_offset:=stack_offset;
+        result:=cur_stack_offset;
+      end;
+
+
+    function tcpuparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
+      var
+        cur_stack_offset: longint;
+        curintreg, curfloatreg, curmmreg: tsuperregister;
+        retcgsize  : tcgsize;
+      begin
+        init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
+
+        result:=create_paraloc_info_intern(p,side,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset);
+
+        create_funcretloc_info(p,side);
+     end;
+
+
+    function  tcpuparamanager.get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;
+      var
+        retcgsize : tcgsize;
+        paraloc : pcgparalocation;
+        reg : TRegister;
+      begin
+         if set_common_funcretloc_info(p,forcetempdef,retcgsize,result) then
+           exit;
+
+        paraloc:=result.add_location;
+        { Return in FPU register? }
+        if result.def.typ=floatdef then
+          begin
+            //if (p.proccalloption in [pocall_softfloat]) or (cs_fp_emulation in current_settings.moduleswitches) then
+            //  begin
+            //    case retcgsize of
+            //      OS_32,
+            //      OS_F32:
+            //        begin
+            //          paraloc^.loc:=LOC_REGISTER;
+            //          paraloc^.register:=NR_L;
+            //          paraloc^.size:=OS_8;
+            //          paraloc^.def:=u8inttype;
+            //
+            //          paraloc:=result.add_location;
+            //          paraloc^.loc:=LOC_REGISTER;
+            //          paraloc^.register:=NR_H;
+            //          paraloc^.size:=OS_8;
+            //          paraloc^.def:=u8inttype;
+            //
+            //          paraloc:=result.add_location;
+            //          paraloc^.loc:=LOC_REGISTER;
+            //          paraloc^.register:=NR_E;
+            //          paraloc^.size:=OS_8;
+            //          paraloc^.def:=u8inttype;
+            //
+            //          paraloc:=result.add_location;
+            //          paraloc^.loc:=LOC_REGISTER;
+            //          paraloc^.register:=NR_D;
+            //          paraloc^.size:=OS_8;
+            //          paraloc^.def:=u8inttype;
+            //        end;
+            //      else
+            //        internalerror(2005082603);
+            //    end;
+            //  end
+            //else
+              begin
+                paraloc^.loc:=LOC_FPUREGISTER;
+                paraloc^.register:=NR_FPU_RESULT_REG;
+                paraloc^.size:=retcgsize;
+                paraloc^.def:=result.def;
+              end;
+          end
+          { Return in register }
+        else
+          begin
+            case retcgsize of
+              //OS_32,OS_S32:
+              //  begin
+              //    paraloc^.loc:=LOC_REGISTER;
+              //    paraloc^.register:=NR_L;
+              //    paraloc^.size:=OS_8;
+              //    paraloc^.def:=u8inttype;
+              //
+              //    paraloc:=result.add_location;
+              //    paraloc^.loc:=LOC_REGISTER;
+              //    paraloc^.register:=NR_H;
+              //    paraloc^.size:=OS_8;
+              //    paraloc^.def:=u8inttype;
+              //
+              //    paraloc:=result.add_location;
+              //    paraloc^.loc:=LOC_REGISTER;
+              //    paraloc^.register:=NR_E;
+              //    paraloc^.size:=OS_8;
+              //    paraloc^.def:=u8inttype;
+              //
+              //    paraloc:=result.add_location;
+              //    paraloc^.loc:=LOC_REGISTER;
+              //    paraloc^.register:=NR_D;
+              //    paraloc^.size:=OS_8;
+              //    paraloc^.def:=u8inttype;
+              //  end;
+              OS_16,OS_S16:
+                begin
+                  paraloc^.loc:=LOC_REGISTER;
+                  paraloc^.register:=NR_A;
+                  paraloc^.size:=OS_8;
+                  paraloc^.def:=u8inttype;
+
+                  paraloc:=result.add_location;
+                  paraloc^.loc:=LOC_REGISTER;
+                  paraloc^.register:=NR_X;
+                  paraloc^.size:=OS_8;
+                  paraloc^.def:=u8inttype;
+                end;
+              OS_8,OS_S8:
+                begin
+                  paraloc^.loc:=LOC_REGISTER;
+                  paraloc^.register:=NR_A;
+                  paraloc^.size:=OS_8;
+                  paraloc^.def:=u8inttype;
+                end;
+              else
+                internalerror(2014030101);
+            end;
+          end;
+      end;
+
+
+    function tcpuparamanager.create_varargs_paraloc_info(p : tabstractprocdef; side: tcallercallee; varargspara:tvarargsparalist):longint;
+      var
+        cur_stack_offset: longint;
+        curintreg, curfloatreg, curmmreg: tsuperregister;
+      begin
+        init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
+
+        result:=create_paraloc_info_intern(p,side,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset);
+        if (p.proccalloption in cstylearrayofconst) then
+          { just continue loading the parameters in the registers }
+          result:=create_paraloc_info_intern(p,side,varargspara,curintreg,curfloatreg,curmmreg,cur_stack_offset)
+        else
+          internalerror(2004102302);
+      end;
+
+begin
+   paramanager:=tcpuparamanager.create;
+end.