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Implemented implicit 'protected' inheritance in virtual functions

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ZZYZX 2017-03-05 01:24:22 +02:00 committed by Christoph Oelckers
parent b87f9b540e
commit 7cbabfb0d4
5 changed files with 25 additions and 23 deletions
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2
src/scripting/backend/codegen.cpp
View file

@ -8725,7 +8725,7 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
}
VMFunction *vmfunc = Function->Variants[0].Implementation;
bool staticcall = (vmfunc->Final || vmfunc->VirtualIndex == ~0u || NoVirtual);
bool staticcall = ((vmfunc->VarFlags & VARF_Final) || vmfunc->VirtualIndex == ~0u || NoVirtual);
count = 0;
// Emit code to pass implied parameters

15
src/scripting/vm/vm.h
View file

@ -705,10 +705,8 @@ do_double: if (inexact)
class VMFunction
{
public:
bool Native;
bool Final = false; // cannot be overridden
bool Unsafe = false; // Contains references to class fields that are unsafe for psp and item state calls.
bool FuncConst = false; // [ZZ] readonly function
bool Unsafe = false;
int VarFlags = 0; // [ZZ] this replaces 5+ bool fields
int BarrierSide = 0; // [ZZ] FScopeBarrier::Side
BYTE ImplicitArgs = 0; // either 0 for static, 1 for method or 3 for action
unsigned VirtualIndex = ~0u;
@ -718,7 +716,7 @@ public:
class PPrototype *Proto;
VMFunction(FName name = NAME_None) : Native(false), ImplicitArgs(0), Name(name), Proto(NULL)
VMFunction(FName name = NAME_None) : ImplicitArgs(0), Name(name), Proto(NULL)
{
AllFunctions.Push(this);
}
@ -942,9 +940,10 @@ class VMNativeFunction : public VMFunction
public:
typedef int (*NativeCallType)(VMValue *param, TArray<VMValue> &defaultparam, int numparam, VMReturn *ret, int numret);
VMNativeFunction() : NativeCall(NULL) { Native = true; }
VMNativeFunction(NativeCallType call) : NativeCall(call) { Native = true; }
VMNativeFunction(NativeCallType call, FName name) : VMFunction(name), NativeCall(call) { Native = true; }
// 8 is VARF_Native.
VMNativeFunction() : NativeCall(NULL) { VarFlags = 8; }
VMNativeFunction(NativeCallType call) : NativeCall(call) { VarFlags = 8; }
VMNativeFunction(NativeCallType call, FName name) : VMFunction(name), NativeCall(call) { VarFlags = 8; }
// Return value is the number of results.
NativeCallType NativeCall;

8
src/scripting/vm/vmexec.h
View file

@ -22,7 +22,7 @@ static int Exec(VMFrameStack *stack, const VMOP *pc, VMReturn *ret, int numret)
const FVoidObj *konsta;
const VM_ATAG *konstatag;
if (f->Func != NULL && !f->Func->Native)
if (f->Func != NULL && !(f->Func->VarFlags & VARF_Native))
{
sfunc = static_cast<VMScriptFunction *>(f->Func);
konstd = sfunc->KonstD;
@ -679,7 +679,7 @@ begin:
#endif
FillReturns(reg, f, returns, pc+1, C);
if (call->Native)
if (call->VarFlags & VARF_Native)
{
try
{
@ -736,7 +736,7 @@ begin:
{
VMFunction *call = (VMFunction *)ptr;
if (call->Native)
if (call->VarFlags & VARF_Native)
{
try
{
@ -1966,7 +1966,7 @@ static void SetReturn(const VMRegisters &reg, VMFrame *frame, VMReturn *ret, VM_
const void *src;
VMScriptFunction *func = static_cast<VMScriptFunction *>(frame->Func);
assert(func != NULL && !func->Native);
assert(func != NULL && !(func->VarFlags & VARF_Native));
assert((regtype & ~REGT_KONST) == ret->RegType);
switch (regtype & REGT_TYPE)

3
src/scripting/vm/vmframe.cpp
View file

@ -48,7 +48,6 @@ TArray<VMFunction *> VMFunction::AllFunctions;
VMScriptFunction::VMScriptFunction(FName name)
{
Native = false;
Name = name;
LineInfo = nullptr;
Code = NULL;
@ -438,7 +437,7 @@ int VMFrameStack::Call(VMFunction *func, VMValue *params, int numparams, VMRetur
bool allocated = false;
try
{
if (func->Native)
if (func->VarFlags & VARF_Native)
{
return static_cast<VMNativeFunction *>(func)->NativeCall(params, func->DefaultArgs, numparams, results, numresults);
}

20
src/scripting/zscript/zcc_compile.cpp
View file

@ -2416,6 +2416,7 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
{
// [ZZ] unspecified virtual function inherits old scope. virtual function scope can't be changed.
sym->Variants[0].Implementation->BarrierSide = FScopeBarrier::SideFromFlags(varflags);
sym->Variants[0].Implementation->VarFlags = sym->Variants[0].Flags;
}
PClass *clstype = static_cast<PClass *>(c->Type());
@ -2426,11 +2427,6 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
Error(f, "Virtual function %s.%s not present", c->Type()->TypeName.GetChars(), FName(f->Name).GetChars());
return;
}
if (varflags & VARF_Final)
sym->Variants[0].Implementation->Final = true;
if (varflags & VARF_ReadOnly)
sym->Variants[0].Implementation->FuncConst = true;
if (forclass)
{
@ -2445,7 +2441,7 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
else
{
auto oldfunc = clstype->Virtuals[vindex];
if (oldfunc->Final)
if (oldfunc->VarFlags & VARF_Final)
{
Error(f, "Attempt to override final function %s", FName(f->Name).GetChars());
}
@ -2455,19 +2451,27 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
Error(f, "Attempt to change scope for virtual function %s", FName(f->Name).GetChars());
}
// you can't change const qualifier for a virtual method
if (sym->Variants[0].Implementation->FuncConst && !oldfunc->FuncConst)
if ((sym->Variants[0].Implementation->VarFlags & VARF_ReadOnly) && !(oldfunc->VarFlags & VARF_ReadOnly))
{
Error(f, "Attempt to add const qualifier to virtual function %s", FName(f->Name).GetChars());
}
// you can't change protected qualifier for a virtual method (i.e. putting private), because this cannot be reliably checked without runtime stuff
if (f->Flags & (ZCC_Private | ZCC_Protected))
{
Error(f, "Attempt to change private/protected qualifiers for virtual function %s", FName(f->Name).GetChars());
}
// inherit scope of original function if override not specified
sym->Variants[0].Implementation->BarrierSide = oldfunc->BarrierSide;
sym->Variants[0].Flags = FScopeBarrier::ChangeSideInFlags(sym->Variants[0].Flags, oldfunc->BarrierSide);
// inherit const from original function
if ((sym->Variants[0].Implementation->FuncConst = oldfunc->FuncConst))
if (oldfunc->VarFlags & VARF_ReadOnly)
sym->Variants[0].Flags |= VARF_ReadOnly;
if (oldfunc->VarFlags & VARF_Protected)
sym->Variants[0].Flags |= VARF_Protected;
clstype->Virtuals[vindex] = sym->Variants[0].Implementation;
sym->Variants[0].Implementation->VirtualIndex = vindex;
sym->Variants[0].Implementation->VarFlags = sym->Variants[0].Flags;
}
}
else