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* generate advance_loc records only if there was code/data since the last advance_loc entry

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git-svn-id: trunk@48686 -
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florian 2021-02-15 22:26:49 +00:00
parent 09d6398942
commit 436a0d3f9e
1 changed files with 17 additions and 0 deletions
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17
compiler/cfidwarf.pas
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@ -542,9 +542,26 @@ implementation
procedure TDwarfAsmCFILowLevel.cfa_advance_loc(list:TAsmList);
var
currloclabel : tasmlabel;
hp : tai;
begin
if FLastloclabel=nil then
internalerror(200404082);
{ search the list backwards and check if we really need an advance loc,
i.e. if real code/data has been generated since the last cfa_advance_loc
call
}
hp:=tai(list.Last);
while assigned(hp) do
begin
{ if we encounter FLastloclabel without encountering code/data, see check below,
we do not need insert an advance_loc entry }
if (hp.typ=ait_label) and (tai_label(hp).labsym=FLastloclabel) then
exit;
{ stop if we find any tai which results in code or data }
if not(hp.typ in ([ait_label]+SkipInstr)) then
break;
hp:=tai(hp.Previous);
end;
current_asmdata.getlabel(currloclabel,alt_dbgframe);
list.concat(tai_label.create(currloclabel));
DwarfList.concat(tdwarfitem.create_reloffset(DW_CFA_advance_loc4,doe_32bit,FLastloclabel,currloclabel));