aggas.pas: Make WriteSection method of TGNUAssembler class virtual.

ppcgen/agppcgas.pas: Override WriteSection method in TPPCAIXAssembler class
  to compute required alignment for base sections.

git-svn-id: trunk@36227 -

compiler/aggas.pas

@@ -49,7 +49,7 @@ interface
         function sectionattrs(atype:TAsmSectiontype):string;virtual;
         function sectionattrs_coff(atype:TAsmSectiontype):string;virtual;
         function sectionalignment_aix(atype:TAsmSectiontype;secalign: byte):string;
-        procedure WriteSection(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder;secalign:byte);
+        procedure WriteSection(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder;secalign:byte);virtual;
         procedure WriteExtraHeader;virtual;
         procedure WriteExtraFooter;virtual;
         procedure WriteInstruction(hp: tai);

compiler/ppcgen/agppcgas.pas

@@ -54,9 +54,12 @@ unit agppcgas;
     end;
 
     TPPCAIXAssembler=class(TPPCGNUAssembler)
+      max_alignment : array[TAsmSectionType] of byte;
       constructor CreateWithWriter(info: pasminfo; wr: TExternalAssemblerOutputFile; freewriter, smart: boolean); override;
      protected
       function sectionname(atype: TAsmSectiontype; const aname: string; aorder: TAsmSectionOrder): string; override;
+      procedure WriteSection(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder;secalign:byte); override;
+      procedure WriteAsmList; override;
       procedure WriteExtraHeader; override;
       procedure WriteExtraFooter; override;
       procedure WriteDirectiveName(dir: TAsmDirective); override;
@@ -467,11 +470,75 @@ unit agppcgas;
 {****************************************************************************}
 
     constructor TPPCAIXAssembler.CreateWithWriter(info: pasminfo; wr: TExternalAssemblerOutputFile; freewriter, smart: boolean);
+      var
+         cur_sectype : TAsmSectionType;
       begin
         inherited;
         InstrWriter := TPPCInstrWriter.create(self);
+        { Use 8-byte alignment as default for all sections }
+        for cur_sectype:=low(TAsmSectionType) to high(TAsmSectionType) do
+           max_alignment[cur_sectype]:=8;
       end;
 
+    procedure TPPCAIXAssembler.WriteSection(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder;secalign:byte);
+
+      begin
+        secalign:=max_alignment[atype];
+        Inherited WriteSection(atype,aname,aorder,secalign);
+      end;
+
+    procedure TPPCAIXAssembler.WriteAsmList;
+      var
+        cur_sectype : TAsmSectionType;
+        cur_list : TAsmList;
+        hal : tasmlisttype;
+        hp : tai;
+        max_al : byte;
+      begin
+        { Parse all asmlists to get maximum alignement used for all types }
+        for hal:=low(TasmlistType) to high(TasmlistType) do
+          begin
+            if not (current_asmdata.asmlists[hal].empty) then
+              begin
+                cur_sectype:=sec_none;
+                hp:=tai(current_asmdata.asmlists[hal].First);
+                while assigned(hp) do
+                  begin
+                    case hp.typ of 
+                     ait_align :
+                       begin
+                         if tai_align_abstract(hp).aligntype > max_alignment[cur_sectype] then
+                           begin 
+                             max_alignment[cur_sectype]:=tai_align_abstract(hp).aligntype;
+			     current_asmdata.asmlists[hal].InsertAfter(tai_comment.Create(strpnew('Alignment put to '+tostr(tai_align_abstract(hp).aligntype))),hp);
+                           end;
+                       end;
+                     ait_section :
+                       begin
+                         cur_sectype:=tai_section(hp).sectype;
+                         if tai_section(hp).secalign > max_alignment[cur_sectype] then
+                           begin
+                             max_alignment[cur_sectype]:=tai_section(hp).secalign;
+			     current_asmdata.asmlists[hal].InsertAfter(tai_comment.Create(strpnew('Section '
+                               +sectionname(tai_section(hp).sectype,'',secorder_default)+' alignment put to '+tostr(tai_section(hp).secalign))),hp);
+                           end;
+                       end;
+                     end;
+                    hp:=tai(hp.next);
+                  end;
+              end;
+          end;
+        { sec_data, sec_rodata and sec_bss all are converted into .data[RW],
+          in WriteSection below,
+          so we take the maximum alignment of the three }
+        max_al:=max_alignment[sec_data];
+        max_al:=max(max_al,max_alignment[sec_rodata]);
+        max_al:=max(max_al,max_alignment[sec_bss]);
+        max_alignment[sec_data]:=max_al;
+        max_alignment[sec_rodata]:=max_al;
+        max_alignment[sec_bss]:=max_al;
+        Inherited WriteAsmList;
+      end;
 
     procedure TPPCAIXAssembler.WriteExtraHeader;
       var
@@ -485,13 +552,14 @@ unit agppcgas;
           required for correct RTTI alignment.
           AIX assembler seems to only care for the first
           alignment value given }
-        writer.AsmWriteln(#9'.csect .data[RW],3');
+        writer.AsmWriteln(#9'.csect .data[RW],'+sectionalignment_aix(sec_data,max_alignment[sec_data]));
+        writer.AsmWriteln(#9'.csect _data.bss_[BS],'+sectionalignment_aix(sec_data,max_alignment[sec_data]));
         { .rodata is translated into .text[RO]
           see sectionname in aggas unit. }
-        writer.AsmWriteln(#9'.csect .text[RO],3');
+        writer.AsmWriteln(#9'.csect .text[RO],'+sectionalignment_aix(sec_rodata_norel,max_alignment[sec_rodata_norel]));
         { make sure we always have a code and toc section,
           the linker expects that }
-        writer.AsmWriteln(#9'.csect .text[PR]');
+        writer.AsmWriteln(#9'.csect .text[PR],'+sectionalignment_aix(sec_code,max_alignment[sec_code]));
         { set _text_s, to be used by footer below } 
         writer.AsmWriteln(#9'_text_s:');
         writer.AsmWriteln(#9'.toc');