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- Implement return type covariance for ZScript virtual functions

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Player701 2019-11-09 19:22:47 +03:00 • committed by Christoph Oelckers
commit 3a526c9e5a
6 changed files with 14 additions and 9 deletions
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5
src/common/scripting/frontend/zcc_compile.cpp
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@ -2366,6 +2366,7 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
sym->Variants[0].Implementation->VarFlags = sym->Variants[0].Flags;
}
bool exactReturnType = mVersion < MakeVersion(4, 4);
PClass *clstype = forclass? static_cast<PClassType *>(c->Type())->Descriptor : nullptr;
if (varflags & VARF_Virtual)
{
@ -2379,7 +2380,7 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
{
auto parentfunc = clstype->ParentClass? dyn_cast<PFunction>(clstype->ParentClass->VMType->Symbols.FindSymbol(sym->SymbolName, true)) : nullptr;
int vindex = clstype->FindVirtualIndex(sym->SymbolName, &sym->Variants[0], parentfunc);
int vindex = clstype->FindVirtualIndex(sym->SymbolName, &sym->Variants[0], parentfunc, exactReturnType);
// specifying 'override' is necessary to prevent one of the biggest problem spots with virtual inheritance: Mismatching argument types.
if (varflags & VARF_Override)
{
@ -2459,7 +2460,7 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
}
else if (forclass)
{
int vindex = clstype->FindVirtualIndex(sym->SymbolName, &sym->Variants[0], nullptr);
int vindex = clstype->FindVirtualIndex(sym->SymbolName, &sym->Variants[0], nullptr, exactReturnType);
if (vindex != -1)
{
Error(f, "Function %s attempts to override parent function without 'override' qualifier", FName(f->Name).GetChars());