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- Implement return type covariance for ZScript virtual functions

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# Conflicts:
#	src/dobjtype.h
#	wadsrc_extra/static/filter/harmony/zscript.txt
This commit is contained in:
Player701 2019-11-09 19:22:47 +03:00 committed by drfrag
parent efe5f349e5
commit 6fa409825b
5 changed files with 13 additions and 8 deletions
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8
src/dobjtype.cpp
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@ -59,6 +59,7 @@
// TYPES -------------------------------------------------------------------
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
bool AreCompatiblePointerTypes(PType* dest, PType* source, bool forcompare = false);
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
@ -778,7 +779,7 @@ PClass *PClass::FindClassTentative(FName name)
//
//==========================================================================
int PClass::FindVirtualIndex(FName name, PFunction::Variant *variant, PFunction *parentfunc)
int PClass::FindVirtualIndex(FName name, PFunction::Variant *variant, PFunction *parentfunc, bool exactReturnType)
{
auto proto = variant->Proto;
for (unsigned i = 0; i < Virtuals.Size(); i++)
@ -806,7 +807,10 @@ int PClass::FindVirtualIndex(FName name, PFunction::Variant *variant, PFunction
for (unsigned a = 0; a < proto->ReturnTypes.Size(); a++)
{
if (proto->ReturnTypes[a] != vproto->ReturnTypes[a])
PType* expected = vproto->ReturnTypes[a];
PType* actual = proto->ReturnTypes[a];
if (expected != actual && (exactReturnType || !AreCompatiblePointerTypes(expected, actual)))
{
fail = true;
break;

2
src/dobjtype.h
View file

@ -42,7 +42,7 @@ public:
void WriteAllFields(FSerializer &ar, const void *addr) const;
bool ReadAllFields(FSerializer &ar, void *addr) const;
void InitializeDefaults();
int FindVirtualIndex(FName name, PFunction::Variant *variant, PFunction *parentfunc);
int FindVirtualIndex(FName name, PFunction::Variant *variant, PFunction *parentfunc, bool exactReturnType);
PSymbol *FindSymbol(FName symname, bool searchparents) const;
PField *AddField(FName name, PType *type, uint32_t flags);

4
src/scripting/backend/codegen.cpp
View file

@ -92,7 +92,7 @@ static const FLOP FxFlops[] =
{ NAME_Round, FLOP_ROUND, [](double v) { return round(v); } },
};
static bool AreCompatiblePointerTypes(PType* dest, PType* source, bool forcompare = false);
bool AreCompatiblePointerTypes(PType* dest, PType* source, bool forcompare = false);
//==========================================================================
//
@ -288,7 +288,7 @@ static PFunction *FindBuiltinFunction(FName funcname)
//
//==========================================================================
static bool AreCompatiblePointerTypes(PType *dest, PType *source, bool forcompare)
bool AreCompatiblePointerTypes(PType *dest, PType *source, bool forcompare)
{
if (dest->isPointer() && source->isPointer())
{

5
src/scripting/zscript/zcc_compile.cpp
View file

@ -3013,6 +3013,7 @@ 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)
{
@ -3026,7 +3027,7 @@ 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)
{
@ -3106,7 +3107,7 @@ 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());

2
wadsrc/static/zscript.txt
View file

@ -1,4 +1,4 @@
version "4.3"
version "4.4"
#include "zscript/base.zs"
#include "zscript/sounddata.zs"
#include "zscript/mapdata.zs"