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Disallow creation of abstract classes outside of their own class (this is so that modders can create their own factory methods, not just for native)

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This commit is contained in:
ZZYZX 2017-02-16 02:39:49 +02:00
parent 363990a105
commit 7d3663500f
4 changed files with 19 additions and 4 deletions
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2
src/dobject.h
View file

@ -205,7 +205,7 @@ enum EObjectFlags
OF_Transient = 1 << 11, // Object should not be archived (references to it will be nulled on disk)
OF_Spawned = 1 << 12, // Thinker was spawned at all (some thinkers get deleted before spawning)
OF_Released = 1 << 13, // Object was released from the GC system and should not be processed by GC function
OF_Abstract = 1 << 14, // Marks a class that cannot be created with CreateNew
OF_Abstract = 1 << 14, // Marks a class that cannot be created with new() function
};
template<class T> class TObjPtr;

17
src/scripting/backend/codegen.cpp
View file

@ -5023,6 +5023,7 @@ FxNew::FxNew(FxExpression *v)
{
val = new FxClassTypeCast(NewClassPointer(RUNTIME_CLASS(DObject)), v, false);
ValueType = NewPointer(RUNTIME_CLASS(DObject));
CallingClass = nullptr;
}
//==========================================================================
@ -5047,6 +5048,7 @@ FxExpression *FxNew::Resolve(FCompileContext &ctx)
CHECKRESOLVED();
SAFE_RESOLVE(val, ctx);
CallingClass = (PClass*)ctx.Class;
if (!val->ValueType->IsKindOf(RUNTIME_CLASS(PClassPointer)))
{
ScriptPosition.Message(MSG_ERROR, "Class type expected");
@ -5058,6 +5060,7 @@ FxExpression *FxNew::Resolve(FCompileContext &ctx)
auto cls = static_cast<PClass *>(static_cast<FxConstant*>(val)->GetValue().GetPointer());
ValueType = NewPointer(cls);
}
return this;
}
@ -5072,7 +5075,7 @@ ExpEmit FxNew::Emit(VMFunctionBuilder *build)
ExpEmit from = val->Emit(build);
from.Free(build);
ExpEmit to(build, REGT_POINTER);
build->Emit(from.Konst ? OP_NEW_K : OP_NEW, to.RegNum, from.RegNum);
build->Emit(from.Konst ? OP_NEW_K : OP_NEW, to.RegNum, from.RegNum, build->GetConstantAddress(CallingClass, ATAG_OBJECT));
return to;
}
@ -7527,8 +7530,18 @@ FxExpression *FxFunctionCall::Resolve(FCompileContext& ctx)
break;
case NAME_New:
if (CheckArgSize(MethodName, ArgList, 1, 1, ScriptPosition))
if (CheckArgSize(MethodName, ArgList, 0, 1, ScriptPosition))
{
// [ZZ] allow implicit new() call to mean "create current class instance"
if (!ArgList.Size() && !ctx.Class->IsKindOf(RUNTIME_CLASS(PClass)))
{
ScriptPosition.Message(MSG_ERROR, "Cannot use implicit new() in a struct");
delete this;
return nullptr;
}
else if (!ArgList.Size())
ArgList.Push(new FxConstant((PClass*)ctx.Class, NewClassPointer((PClass*)ctx.Class), ScriptPosition));
func = new FxNew(ArgList[0]);
ArgList[0] = nullptr;
}

1
src/scripting/backend/codegen.h
View file

@ -1208,6 +1208,7 @@ private:
class FxNew : public FxExpression
{
FxExpression *val;
PClass *CallingClass;
public:

3
src/scripting/vm/vmexec.h
View file

@ -787,7 +787,8 @@ begin:
{
b = B;
PClass *cls = (PClass*)(pc->op == OP_NEW ? reg.a[b] : konsta[b].v);
if (cls->ObjectFlags & OF_Abstract) ThrowAbortException(X_OTHER, "Cannot instantiate abstract class %s", cls->TypeName.GetChars());
PClass *callingcls = (PClass*)konsta[C].o; // [ZZ] due to how this is set, it's always const
if ((cls->ObjectFlags & OF_Abstract) && callingcls != cls) ThrowAbortException(X_OTHER, "Cannot instantiate abstract class %s outside of that class", cls->TypeName.GetChars());
reg.a[a] = cls->CreateNew();
reg.atag[a] = ATAG_OBJECT;
NEXTOP;