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Apply return optimization to struct/union return types.

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This commit is contained in:
Stephen Heumann 2022-12-19 20:49:25 -06:00
parent 030f3ff9e1
commit e910eda623
1 changed files with 9 additions and 20 deletions
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29
Parser.pas
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@ -199,6 +199,7 @@ var
declaredTagOrEnumConst: boolean; {was a tag or enum const declared?}
returnCount: integer; {number of return statements}
skipReturn: boolean; {skip the ordinary return at end of function?}
structReturnVar: identPtr; {static variable to hold a struct/union return value}
{parameter processing variables}
{------------------------------}
@ -388,7 +389,10 @@ if not doingFunction then begin {if so, finish it off}
scalarType : Gen0t(pc_ret, baseType);
arrayType : ;
structType ,
unionType ,
unionType : begin
Gen1Name(pc_lao, 0, structReturnVar^.name);
Gen0t(pc_rev, cgULong);
end;
pointerType : Gen0t(pc_ret, cgULong);
functionType: ;
enumConst : ;
@ -829,7 +833,6 @@ var
var
id: identPtr; {structure id}
size: longint; {size of the struct/union}
tk: tokenType; {structure name token}
procedure ReturnValue (tp: baseTypeEnum);
@ -859,12 +862,7 @@ var
if token.kind <> semicolonch then {if present, evaluate the return value}
begin
if fType^.kind in [structType,unionType] then begin
tk.kind := ident;
tk.class := identifier;
tk.name := @'@struct';
tk.symbolPtr := nil;
id := FindSymbol(tk, variableSpace, false, true);
Gen1Name(pc_lao, 0, id^.name);
Gen1Name(pc_lao, 0, structReturnVar^.name);
size := fType^.size;
end {if}
else if fType^.kind = scalarType then
@ -3629,7 +3627,6 @@ var
fnType: typePtr; {function type}
segType: integer; {segment type}
tp: typePtr; {for tracing type lists}
tk: tokenType; {work token}
startLine: longint; {line where this declaration starts}
declSpecifiers: declSpecifiersRecord; {type & specifiers for the declaration}
@ -4122,17 +4119,9 @@ if isFunction then begin
end {if}
else begin
{set up struct/union area}
if variable^.itype^.ftype^.kind in [structType,unionType] then begin
lp := NewSymbol(@'@struct', variable^.itype^.ftype, staticsy,
variablespace, declared, false);
tk.kind := ident;
tk.class := identifier;
tk.name := @'@struct';
tk.symbolPtr := nil;
lp := FindSymbol(tk, variableSpace, false, true);
Gen1Name(pc_lao, 0, lp^.name);
Gen2t(pc_str, 0, 0, cgULong);
end; {if}
if variable^.itype^.ftype^.kind in [structType,unionType] then
structReturnVar := NewSymbol(@'@struct', variable^.itype^.ftype,
staticsy, variablespace, declared, false);
{generate parameter labels}
if fnType^.overrideKR then
GenParameters(nil)