mirror of https://github.com/ZDoom/qzdoom.git
The return statement now accepts any expression as its return value
So something like 'return ++user_x;' is now possible Admittedly this needed quite a bit of refactoring mainly due to the fact that return types now have to be checked after resolving the function rather than before
This commit is contained in:
Leonard2
Christoph Oelckers
parent
e79c0225ed
commit
b97024b710
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@ -270,23 +270,28 @@ static void FinishThingdef()
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for (i = 0; i < StateTempCalls.Size(); ++i)
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{
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FStateTempCall *tcall = StateTempCalls[i];
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VMFunction *func;
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VMFunction *func = nullptr;
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assert(tcall->Code != NULL);
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// We don't know the return type in advance for anonymous functions.
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FCompileContext ctx(tcall->ActorClass, nullptr);
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tcall->Code = tcall->Code->Resolve(ctx);
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tcall->Proto = ctx.ReturnProto;
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// Make sure resolving it didn't obliterate it.
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if (tcall->Code != nullptr)
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{
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// Can we call this function directly without wrapping it in an
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// anonymous function? e.g. Are we passing any parameters to it?
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func = tcall->Code->GetDirectFunction();
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if (func == NULL)
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{
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FCompileContext ctx(tcall->ActorClass);
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tcall->Code = tcall->Code->Resolve(ctx);
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// Make sure resolving it didn't obliterate it.
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if (tcall->Code != NULL)
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if (func == nullptr)
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{
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VMFunctionBuilder buildit;
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assert(tcall->Proto != nullptr);
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// Allocate registers used to pass parameters in.
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// self, stateowner, state (all are pointers)
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buildit.Registers[REGT_POINTER].Get(3);
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@ -300,15 +305,7 @@ static void FinishThingdef()
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// Generate prototype for this anonymous function
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TArray<PType *> args(3);
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SetImplicitArgs(&args, NULL, tcall->ActorClass, VARF_Method | VARF_Action);
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if (tcall->Proto != NULL)
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{
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sfunc->Proto = NewPrototype(tcall->Proto->ReturnTypes, args);
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}
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else
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{
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TArray<PType *> norets(0);
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sfunc->Proto = NewPrototype(norets, args);
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}
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func = sfunc;
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@ -321,11 +318,9 @@ static void FinishThingdef()
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codesize += sfunc->CodeSize;
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}
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}
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}
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if (tcall->Code != NULL)
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{
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delete tcall->Code;
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tcall->Code = NULL;
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tcall->Code = nullptr;
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for (int k = 0; k < tcall->NumStates; ++k)
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{
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tcall->ActorClass->OwnedStates[tcall->FirstState + k].SetAction(func);
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@ -190,10 +190,9 @@ AFuncDesc *FindFunction(const char * string);
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void ParseStates(FScanner &sc, PClassActor *actor, AActor *defaults, Baggage &bag);
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void ParseFunctionParameters(FScanner &sc, PClassActor *cls, TArray<FxExpression *> &out_params,
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PFunction *afd, FString statestring, FStateDefinitions *statedef);
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FxExpression *ParseActions(FScanner &sc, FState state, FString statestring, Baggage &bag, PPrototype *&proto, bool &endswithret);
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FxExpression *ParseActions(FScanner &sc, FState state, FString statestring, Baggage &bag, bool &endswithret);
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class FxVMFunctionCall *ParseAction(FScanner &sc, FState state, FString statestring, Baggage &bag);
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FName CheckCastKludges(FName in);
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void AddImplicitReturn(class FxSequence *code, const PPrototype *proto, FScanner &sc);
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void SetImplicitArgs(TArray<PType *> *args, TArray<DWORD> *argflags, PClassActor *cls, DWORD funcflags);
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PFunction *FindGlobalActionFunction(const char *name);
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@ -356,6 +355,7 @@ int MatchString (const char *in, const char **strings);
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#define ACTION_RETURN_STATE(v) do { FState *state = v; if (numret > 0) { assert(ret != NULL); ret->SetPointer(state, ATAG_STATE); return 1; } return 0; } while(0)
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#define ACTION_RETURN_FLOAT(v) do { double u = v; if (numret > 0) { assert(ret != nullptr); ret->SetFloat(u); return 1; } return 0; } while(0)
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#define ACTION_RETURN_INT(v) do { int u = v; if (numret > 0) { assert(ret != NULL); ret->SetInt(u); return 1; } return 0; } while(0)
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#define ACTION_RETURN_BOOL(v) ACTION_RETURN_INT(v)
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@ -62,14 +62,16 @@ class FxJumpStatement;
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struct FCompileContext
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{
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TArray<FxJumpStatement *> Jumps;
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PPrototype *ReturnProto;
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PClassActor *Class;
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FCompileContext(PClassActor *cls = nullptr);
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FCompileContext(PClassActor *cls = nullptr, PPrototype *ret = nullptr);
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PSymbol *FindInClass(FName identifier);
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PSymbol *FindGlobal(FName identifier);
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void HandleJumps(int token, FxExpression *handler);
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void CheckReturn(PPrototype *proto, FScriptPosition &pos);
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};
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//==========================================================================
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@ -170,14 +172,14 @@ struct ExpVal
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struct ExpEmit
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{
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ExpEmit() : RegNum(0), RegType(REGT_NIL), Konst(false), Fixed(false) {}
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ExpEmit(int reg, int type) : RegNum(reg), RegType(type), Konst(false), Fixed(false) {}
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ExpEmit(int reg, int type, bool konst) : RegNum(reg), RegType(type), Konst(konst), Fixed(false) {}
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ExpEmit() : RegNum(0), RegType(REGT_NIL), Konst(false), Fixed(false), Final(false) {}
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ExpEmit(int reg, int type) : RegNum(reg), RegType(type), Konst(false), Fixed(false), Final(false) {}
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ExpEmit(int reg, int type, bool konst) : RegNum(reg), RegType(type), Konst(konst), Fixed(false), Final(false) {}
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ExpEmit(VMFunctionBuilder *build, int type);
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void Free(VMFunctionBuilder *build);
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void Reuse(VMFunctionBuilder *build);
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BYTE RegNum, RegType, Konst:1, Fixed:1;
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BYTE RegNum, RegType, Konst:1, Fixed:1, Final:1;
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};
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//==========================================================================
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@ -202,6 +204,7 @@ public:
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virtual bool isConstant() const;
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virtual bool RequestAddress();
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virtual PPrototype *ReturnProto();
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virtual VMFunction *GetDirectFunction();
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bool IsNumeric() const { return ValueType != TypeName && (ValueType->GetRegType() == REGT_INT || ValueType->GetRegType() == REGT_FLOAT); }
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bool IsPointer() const { return ValueType->GetRegType() == REGT_POINTER; }
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@ -748,6 +751,7 @@ public:
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class FxRandom : public FxExpression
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{
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protected:
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bool EmitTail;
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FRandom *rng;
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FxExpression *min, *max;
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@ -756,7 +760,7 @@ public:
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FxRandom(FRandom *, FxExpression *mi, FxExpression *ma, const FScriptPosition &pos);
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~FxRandom();
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FxExpression *Resolve(FCompileContext&);
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PPrototype *ReturnProto();
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ExpEmit Emit(VMFunctionBuilder *build);
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};
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@ -802,6 +806,7 @@ public:
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class FxRandom2 : public FxExpression
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{
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bool EmitTail;
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FRandom * rng;
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FxExpression *mask;
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@ -810,7 +815,7 @@ public:
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FxRandom2(FRandom *, FxExpression *m, const FScriptPosition &pos);
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~FxRandom2();
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FxExpression *Resolve(FCompileContext&);
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PPrototype *ReturnProto();
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ExpEmit Emit(VMFunctionBuilder *build);
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};
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@ -915,8 +920,9 @@ public:
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class FxActionSpecialCall : public FxExpression
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{
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FxExpression *Self;
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int Special;
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bool EmitTail;
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FxExpression *Self;
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FArgumentList *ArgList;
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public:
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@ -924,6 +930,7 @@ public:
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FxActionSpecialCall(FxExpression *self, int special, FArgumentList *args, const FScriptPosition &pos);
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~FxActionSpecialCall();
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FxExpression *Resolve(FCompileContext&);
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PPrototype *ReturnProto();
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ExpEmit Emit(VMFunctionBuilder *build);
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};
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@ -954,6 +961,7 @@ public:
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class FxVMFunctionCall : public FxExpression
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{
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bool EmitTail;
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PFunction *Function;
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FArgumentList *ArgList;
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@ -961,13 +969,10 @@ public:
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FxVMFunctionCall(PFunction *func, FArgumentList *args, const FScriptPosition &pos);
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~FxVMFunctionCall();
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FxExpression *Resolve(FCompileContext&);
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PPrototype *ReturnProto();
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VMFunction *GetDirectFunction();
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ExpEmit Emit(VMFunctionBuilder *build);
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ExpEmit Emit(VMFunctionBuilder *build, bool tailcall);
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bool CheckEmitCast(VMFunctionBuilder *build, bool returnit, ExpEmit ®);
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unsigned GetArgCount() const { return ArgList == NULL ? 0 : ArgList->Size(); }
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PFunction *GetFunction() const { return Function; }
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VMFunction *GetVMFunction() const { return Function->Variants[0].Implementation; }
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bool IsDirectFunction();
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};
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//==========================================================================
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@ -1089,10 +1094,10 @@ public:
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class FxReturnStatement : public FxExpression
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{
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FxVMFunctionCall *Call;
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FxExpression *Value;
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public:
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FxReturnStatement(FxVMFunctionCall *call, const FScriptPosition &pos);
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FxReturnStatement(FxExpression *value, const FScriptPosition &pos);
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~FxReturnStatement();
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FxExpression *Resolve(FCompileContext&);
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ExpEmit Emit(VMFunctionBuilder *build);
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@ -1146,12 +1151,14 @@ public:
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class FxRuntimeStateIndex : public FxExpression
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{
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bool EmitTail;
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FxExpression *Index;
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public:
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FxRuntimeStateIndex(FxExpression *index);
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~FxRuntimeStateIndex();
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FxExpression *Resolve(FCompileContext&);
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PPrototype *ReturnProto();
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ExpEmit Emit(VMFunctionBuilder *build);
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};
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@ -91,7 +91,7 @@ static const FLOP FxFlops[] =
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//
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//==========================================================================
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FCompileContext::FCompileContext(PClassActor *cls) : Class(cls)
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FCompileContext::FCompileContext(PClassActor *cls, PPrototype *ret) : Class(cls), ReturnProto(ret)
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{
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}
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@ -118,6 +118,50 @@ void FCompileContext::HandleJumps(int token, FxExpression *handler)
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}
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}
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void FCompileContext::CheckReturn(PPrototype *proto, FScriptPosition &pos)
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{
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assert(proto != nullptr);
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bool fail = false;
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if (ReturnProto == nullptr)
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{
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ReturnProto = proto;
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return;
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}
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// A prototype that defines fewer return types can be compatible with
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// one that defines more if the shorter one matches the initial types
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// for the longer one.
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if (ReturnProto->ReturnTypes.Size() < proto->ReturnTypes.Size())
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{ // Make proto the shorter one to avoid code duplication below.
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swapvalues(proto, ReturnProto);
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}
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// If one prototype returns nothing, they both must.
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if (proto->ReturnTypes.Size() == 0)
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{
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if (ReturnProto->ReturnTypes.Size() != 0)
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{
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fail = true;
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}
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}
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else
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{
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for (unsigned i = 0; i < proto->ReturnTypes.Size(); i++)
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{
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if (ReturnProto->ReturnTypes[i] != proto->ReturnTypes[i])
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{ // Incompatible
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fail = true;
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break;
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}
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}
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}
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if (fail)
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{
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pos.Message(MSG_ERROR, "All return expressions must deduce to the same type");
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}
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}
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//==========================================================================
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//
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// ExpEmit
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@ -125,7 +169,7 @@ void FCompileContext::HandleJumps(int token, FxExpression *handler)
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//==========================================================================
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ExpEmit::ExpEmit(VMFunctionBuilder *build, int type)
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: RegNum(build->Registers[type].Get(1)), RegType(type), Konst(false), Fixed(false)
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: RegNum(build->Registers[type].Get(1)), RegType(type), Konst(false), Fixed(false), Final(false)
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{
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}
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@ -228,6 +272,26 @@ bool FxExpression::RequestAddress()
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return false;
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}
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//==========================================================================
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//
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// Called by return statements.
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//
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//==========================================================================
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PPrototype *FxExpression::ReturnProto()
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{
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assert(ValueType != nullptr);
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TArray<PType *> ret(0);
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TArray<PType *> none(0);
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if (ValueType != TypeVoid)
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{
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ret.Push(ValueType);
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}
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return NewPrototype(ret, none);
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}
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//==========================================================================
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//
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//
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@ -2651,6 +2715,7 @@ ExpEmit FxMinMax::Emit(VMFunctionBuilder *build)
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FxRandom::FxRandom(FRandom * r, FxExpression *mi, FxExpression *ma, const FScriptPosition &pos)
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: FxExpression(pos)
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{
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EmitTail = false;
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if (mi != NULL && ma != NULL)
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{
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min = new FxIntCast(mi);
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@ -2679,6 +2744,18 @@ FxRandom::~FxRandom()
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//
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//==========================================================================
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PPrototype *FxRandom::ReturnProto()
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{
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EmitTail = true;
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return FxExpression::ReturnProto();
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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FxExpression *FxRandom::Resolve(FCompileContext &ctx)
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{
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CHECKRESOLVED();
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@ -2706,12 +2783,12 @@ int DecoRandom(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret,
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FRandom *rng = reinterpret_cast<FRandom *>(param[0].a);
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if (numparam == 1)
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{
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ret->SetInt((*rng)());
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ACTION_RETURN_INT((*rng)());
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}
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else if (numparam == 2)
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{
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int maskval = param[1].i;
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ret->SetInt(rng->Random2(maskval));
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ACTION_RETURN_INT(rng->Random2(maskval));
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}
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else if (numparam == 3)
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{
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@ -2720,9 +2797,11 @@ int DecoRandom(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret,
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{
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swapvalues(max, min);
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}
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ret->SetInt((*rng)(max - min + 1) + min);
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ACTION_RETURN_INT((*rng)(max - min + 1) + min);
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}
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return 1;
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// Shouldn't happen
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return 0;
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}
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ExpEmit FxRandom::Emit(VMFunctionBuilder *build)
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@ -2735,17 +2814,27 @@ ExpEmit FxRandom::Emit(VMFunctionBuilder *build)
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assert(((PSymbolVMFunction *)sym)->Function != NULL);
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callfunc = ((PSymbolVMFunction *)sym)->Function;
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int opcode = (EmitTail ? OP_TAIL_K : OP_CALL_K);
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build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(rng, ATAG_RNG));
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if (min != NULL && max != NULL)
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{
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EmitParameter(build, min, ScriptPosition);
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EmitParameter(build, max, ScriptPosition);
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build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
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build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
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}
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else
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{
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build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 1, 1);
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build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 1, 1);
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}
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if (EmitTail)
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{
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ExpEmit call;
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call.Final = true;
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return call;
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}
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ExpEmit out(build, REGT_INT);
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build->Emit(OP_RESULT, 0, REGT_INT, out.RegNum);
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return out;
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@ -2952,13 +3041,12 @@ int DecoFRandom(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret
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{
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swapvalues(max, min);
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}
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ret->SetFloat(frandom * (max - min) + min);
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ACTION_RETURN_FLOAT(frandom * (max - min) + min);
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}
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else
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{
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ret->SetFloat(frandom);
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ACTION_RETURN_FLOAT(frandom);
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}
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return 1;
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}
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ExpEmit FxFRandom::Emit(VMFunctionBuilder *build)
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@ -2971,17 +3059,27 @@ ExpEmit FxFRandom::Emit(VMFunctionBuilder *build)
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assert(((PSymbolVMFunction *)sym)->Function != NULL);
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callfunc = ((PSymbolVMFunction *)sym)->Function;
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int opcode = (EmitTail ? OP_TAIL_K : OP_CALL_K);
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build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(rng, ATAG_RNG));
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if (min != NULL && max != NULL)
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{
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EmitParameter(build, min, ScriptPosition);
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EmitParameter(build, max, ScriptPosition);
|
||||
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
|
||||
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
|
||||
}
|
||||
else
|
||||
{
|
||||
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 1, 1);
|
||||
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 1, 1);
|
||||
}
|
||||
|
||||
if (EmitTail)
|
||||
{
|
||||
ExpEmit call;
|
||||
call.Final = true;
|
||||
return call;
|
||||
}
|
||||
|
||||
ExpEmit out(build, REGT_FLOAT);
|
||||
build->Emit(OP_RESULT, 0, REGT_FLOAT, out.RegNum);
|
||||
return out;
|
||||
|
|
@ -2996,6 +3094,7 @@ ExpEmit FxFRandom::Emit(VMFunctionBuilder *build)
|
|||
FxRandom2::FxRandom2(FRandom *r, FxExpression *m, const FScriptPosition &pos)
|
||||
: FxExpression(pos)
|
||||
{
|
||||
EmitTail = false;
|
||||
rng = r;
|
||||
if (m) mask = new FxIntCast(m);
|
||||
else mask = new FxConstant(-1, pos);
|
||||
|
|
@ -3019,6 +3118,18 @@ FxRandom2::~FxRandom2()
|
|||
//
|
||||
//==========================================================================
|
||||
|
||||
PPrototype *FxRandom2::ReturnProto()
|
||||
{
|
||||
EmitTail = true;
|
||||
return FxExpression::ReturnProto();
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
//
|
||||
//
|
||||
//
|
||||
//==========================================================================
|
||||
|
||||
FxExpression *FxRandom2::Resolve(FCompileContext &ctx)
|
||||
{
|
||||
CHECKRESOLVED();
|
||||
|
|
@ -3042,9 +3153,19 @@ ExpEmit FxRandom2::Emit(VMFunctionBuilder *build)
|
|||
assert(((PSymbolVMFunction *)sym)->Function != NULL);
|
||||
callfunc = ((PSymbolVMFunction *)sym)->Function;
|
||||
|
||||
int opcode = (EmitTail ? OP_TAIL_K : OP_CALL_K);
|
||||
|
||||
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(rng, ATAG_RNG));
|
||||
EmitParameter(build, mask, ScriptPosition);
|
||||
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2, 1);
|
||||
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2, 1);
|
||||
|
||||
if (EmitTail)
|
||||
{
|
||||
ExpEmit call;
|
||||
call.Final = true;
|
||||
return call;
|
||||
}
|
||||
|
||||
ExpEmit out(build, REGT_INT);
|
||||
build->Emit(OP_RESULT, 0, REGT_INT, out.RegNum);
|
||||
return out;
|
||||
|
|
@ -3623,6 +3744,7 @@ FxActionSpecialCall::FxActionSpecialCall(FxExpression *self, int special, FArgum
|
|||
Self = self;
|
||||
Special = special;
|
||||
ArgList = args;
|
||||
EmitTail = false;
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
|
|
@ -3643,6 +3765,18 @@ FxActionSpecialCall::~FxActionSpecialCall()
|
|||
//
|
||||
//==========================================================================
|
||||
|
||||
PPrototype *FxActionSpecialCall::ReturnProto()
|
||||
{
|
||||
EmitTail = true;
|
||||
return FxExpression::ReturnProto();
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
//
|
||||
//
|
||||
//
|
||||
//==========================================================================
|
||||
|
||||
FxExpression *FxActionSpecialCall::Resolve(FCompileContext& ctx)
|
||||
{
|
||||
CHECKRESOLVED();
|
||||
|
|
@ -3695,7 +3829,6 @@ FxExpression *FxActionSpecialCall::Resolve(FCompileContext& ctx)
|
|||
int DecoCallLineSpecial(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, int numret)
|
||||
{
|
||||
assert(numparam > 2 && numparam < 8);
|
||||
assert(numret == 1);
|
||||
assert(param[0].Type == REGT_INT);
|
||||
assert(param[1].Type == REGT_POINTER);
|
||||
int v[5] = { 0 };
|
||||
|
|
@ -3704,8 +3837,7 @@ int DecoCallLineSpecial(VMFrameStack *stack, VMValue *param, int numparam, VMRet
|
|||
{
|
||||
v[i - 2] = param[i].i;
|
||||
}
|
||||
ret->SetInt(P_ExecuteSpecial(param[0].i, NULL, reinterpret_cast<AActor*>(param[1].a), false, v[0], v[1], v[2], v[3], v[4]));
|
||||
return 1;
|
||||
ACTION_RETURN_INT(P_ExecuteSpecial(param[0].i, NULL, reinterpret_cast<AActor*>(param[1].a), false, v[0], v[1], v[2], v[3], v[4]));
|
||||
}
|
||||
|
||||
ExpEmit FxActionSpecialCall::Emit(VMFunctionBuilder *build)
|
||||
|
|
@ -3750,6 +3882,14 @@ ExpEmit FxActionSpecialCall::Emit(VMFunctionBuilder *build)
|
|||
assert(((PSymbolVMFunction *)sym)->Function != NULL);
|
||||
callfunc = ((PSymbolVMFunction *)sym)->Function;
|
||||
|
||||
if (EmitTail)
|
||||
{
|
||||
build->Emit(OP_TAIL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2 + i, 0);
|
||||
ExpEmit call;
|
||||
call.Final = true;
|
||||
return call;
|
||||
}
|
||||
|
||||
ExpEmit dest(build, REGT_INT);
|
||||
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2 + i, 1);
|
||||
build->Emit(OP_RESULT, 0, REGT_INT, dest.RegNum);
|
||||
|
|
@ -3767,6 +3907,7 @@ FxVMFunctionCall::FxVMFunctionCall(PFunction *func, FArgumentList *args, const F
|
|||
{
|
||||
Function = func;
|
||||
ArgList = args;
|
||||
EmitTail = false;
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
|
|
@ -3780,6 +3921,38 @@ FxVMFunctionCall::~FxVMFunctionCall()
|
|||
SAFE_DELETE(ArgList);
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
//
|
||||
//
|
||||
//
|
||||
//==========================================================================
|
||||
|
||||
PPrototype *FxVMFunctionCall::ReturnProto()
|
||||
{
|
||||
EmitTail = true;
|
||||
return Function->Variants[0].Implementation->Proto;
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
//
|
||||
//
|
||||
//
|
||||
//==========================================================================
|
||||
|
||||
VMFunction *FxVMFunctionCall::GetDirectFunction()
|
||||
{
|
||||
// If this return statement calls a function with no arguments,
|
||||
// then it can be a "direct" function. That is, the DECORATE
|
||||
// definition can call that function directly without wrapping
|
||||
// it inside VM code.
|
||||
if (EmitTail && (ArgList ? ArgList->Size() : 0) == 0 && (Function->Flags & VARF_Action))
|
||||
{
|
||||
return Function->Variants[0].Implementation;
|
||||
}
|
||||
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
//
|
||||
// FxVMFunctionCall :: Resolve
|
||||
|
|
@ -3809,6 +3982,11 @@ FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
|
|||
{
|
||||
ValueType = rets[0];
|
||||
}
|
||||
else
|
||||
{
|
||||
ValueType = TypeVoid;
|
||||
}
|
||||
|
||||
return this;
|
||||
}
|
||||
|
||||
|
|
@ -3821,19 +3999,14 @@ FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
|
|||
//==========================================================================
|
||||
|
||||
ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
|
||||
{
|
||||
return Emit(build, false);
|
||||
}
|
||||
|
||||
ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build, bool tailcall)
|
||||
{
|
||||
assert(build->Registers[REGT_POINTER].GetMostUsed() >= 3);
|
||||
int count = GetArgCount();
|
||||
int count = (ArgList ? ArgList->Size() : 0);
|
||||
|
||||
if (count == 1)
|
||||
{
|
||||
ExpEmit reg;
|
||||
if (CheckEmitCast(build, tailcall, reg))
|
||||
if (CheckEmitCast(build, EmitTail, reg))
|
||||
{
|
||||
return reg;
|
||||
}
|
||||
|
|
@ -3862,10 +4035,12 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build, bool tailcall)
|
|||
VMFunction *vmfunc = Function->Variants[0].Implementation;
|
||||
int funcaddr = build->GetConstantAddress(vmfunc, ATAG_OBJECT);
|
||||
// Emit the call
|
||||
if (tailcall)
|
||||
if (EmitTail)
|
||||
{ // Tail call
|
||||
build->Emit(OP_TAIL_K, funcaddr, count, 0);
|
||||
return ExpEmit();
|
||||
ExpEmit call;
|
||||
call.Final = true;
|
||||
return call;
|
||||
}
|
||||
else if (vmfunc->Proto->ReturnTypes.Size() > 0)
|
||||
{ // Call, expecting one result
|
||||
|
|
@ -3913,6 +4088,7 @@ bool FxVMFunctionCall::CheckEmitCast(VMFunctionBuilder *build, bool returnit, Ex
|
|||
where.Free(build);
|
||||
}
|
||||
reg = ExpEmit();
|
||||
reg.Final = true;
|
||||
}
|
||||
else
|
||||
{
|
||||
|
|
@ -4540,54 +4716,77 @@ ExpEmit FxJumpStatement::Emit(VMFunctionBuilder *build)
|
|||
//
|
||||
//==========================================================================
|
||||
|
||||
FxReturnStatement::FxReturnStatement(FxVMFunctionCall *call, const FScriptPosition &pos)
|
||||
: FxExpression(pos), Call(call)
|
||||
FxReturnStatement::FxReturnStatement(FxExpression *value, const FScriptPosition &pos)
|
||||
: FxExpression(pos), Value(value)
|
||||
{
|
||||
ValueType = TypeVoid;
|
||||
}
|
||||
|
||||
FxReturnStatement::~FxReturnStatement()
|
||||
{
|
||||
SAFE_DELETE(Call);
|
||||
SAFE_DELETE(Value);
|
||||
}
|
||||
|
||||
FxExpression *FxReturnStatement::Resolve(FCompileContext &ctx)
|
||||
{
|
||||
CHECKRESOLVED();
|
||||
if (Call != NULL)
|
||||
SAFE_RESOLVE_OPT(Value, ctx);
|
||||
|
||||
PPrototype *retproto;
|
||||
if (Value == nullptr)
|
||||
{
|
||||
Call = static_cast<FxVMFunctionCall *>(Call->Resolve(ctx));
|
||||
ABORT(Call);
|
||||
TArray<PType *> none(0);
|
||||
retproto = NewPrototype(none, none);
|
||||
}
|
||||
else
|
||||
{
|
||||
retproto = Value->ReturnProto();
|
||||
}
|
||||
|
||||
ctx.CheckReturn(retproto, ScriptPosition);
|
||||
|
||||
return this;
|
||||
}
|
||||
|
||||
ExpEmit FxReturnStatement::Emit(VMFunctionBuilder *build)
|
||||
{
|
||||
// If we return nothing, use a regular RET opcode. If we return
|
||||
// something, use TAIL to call the function. Our return type
|
||||
// should be compatible with the called function's return type.
|
||||
if (Call == NULL)
|
||||
// If we return nothing, use a regular RET opcode.
|
||||
// Otherwise just return the value we're given.
|
||||
if (Value == nullptr)
|
||||
{
|
||||
build->Emit(OP_RET, RET_FINAL, REGT_NIL, 0);
|
||||
}
|
||||
else
|
||||
{
|
||||
Call->Emit(build, true);
|
||||
ExpEmit ret = Value->Emit(build);
|
||||
|
||||
// Check if it is a function call that simplified itself
|
||||
// into a tail call in which case we don't emit anything.
|
||||
if (!ret.Final)
|
||||
{
|
||||
if (Value->ValueType == TypeVoid)
|
||||
{ // Nothing is returned.
|
||||
build->Emit(OP_RET, RET_FINAL, REGT_NIL, 0);
|
||||
}
|
||||
return ExpEmit();
|
||||
else
|
||||
{
|
||||
build->Emit(OP_RET, RET_FINAL, ret.RegType | (ret.Konst ? REGT_KONST : 0), ret.RegNum);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
ExpEmit out;
|
||||
out.Final = true;
|
||||
return out;
|
||||
}
|
||||
|
||||
VMFunction *FxReturnStatement::GetDirectFunction()
|
||||
{
|
||||
// If this return statement calls a function with no arguments,
|
||||
// then it can be a "direct" function. That is, the DECORATE
|
||||
// definition can call that function directly without wrapping
|
||||
// it inside VM code.
|
||||
if (Call != NULL && Call->GetArgCount() == 0 && (Call->GetFunction()->Flags & VARF_Action))
|
||||
if (Value != nullptr)
|
||||
{
|
||||
return Call->GetVMFunction();
|
||||
return Value->GetDirectFunction();
|
||||
}
|
||||
return NULL;
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
|
|
@ -4754,6 +4953,7 @@ FxExpression *FxStateByIndex::Resolve(FCompileContext &ctx)
|
|||
FxRuntimeStateIndex::FxRuntimeStateIndex(FxExpression *index)
|
||||
: FxExpression(index->ScriptPosition), Index(index)
|
||||
{
|
||||
EmitTail = false;
|
||||
ValueType = TypeState;
|
||||
}
|
||||
|
||||
|
|
@ -4762,6 +4962,12 @@ FxRuntimeStateIndex::~FxRuntimeStateIndex()
|
|||
SAFE_DELETE(Index);
|
||||
}
|
||||
|
||||
PPrototype *FxRuntimeStateIndex::ReturnProto()
|
||||
{
|
||||
EmitTail = true;
|
||||
return FxExpression::ReturnProto();
|
||||
}
|
||||
|
||||
FxExpression *FxRuntimeStateIndex::Resolve(FCompileContext &ctx)
|
||||
{
|
||||
CHECKRESOLVED();
|
||||
|
|
@ -4794,14 +5000,12 @@ static int DecoHandleRuntimeState(VMFrameStack *stack, VMValue *param, int numpa
|
|||
// Null is returned if the location was invalid which means that no jump will be performed
|
||||
// if used as return value
|
||||
// 0 always meant the same thing so we handle it here for compatibility
|
||||
ret->SetPointer(nullptr, ATAG_STATE);
|
||||
ACTION_RETURN_STATE(nullptr);
|
||||
}
|
||||
else
|
||||
{
|
||||
ret->SetPointer(stateinfo->mCallingState + index, ATAG_STATE);
|
||||
ACTION_RETURN_STATE(stateinfo->mCallingState + index);
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
ExpEmit FxRuntimeStateIndex::Emit(VMFunctionBuilder *build)
|
||||
|
|
@ -4823,8 +5027,16 @@ ExpEmit FxRuntimeStateIndex::Emit(VMFunctionBuilder *build)
|
|||
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
|
||||
callfunc = ((PSymbolVMFunction *)sym)->Function;
|
||||
|
||||
if (EmitTail)
|
||||
{
|
||||
build->Emit(OP_TAIL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
|
||||
out.Final = true;
|
||||
}
|
||||
else
|
||||
{
|
||||
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
|
||||
build->Emit(OP_RESULT, 0, REGT_POINTER, out.RegNum);
|
||||
}
|
||||
|
||||
return out;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -315,10 +315,10 @@ do_stop:
|
|||
}
|
||||
|
||||
bool hasfinalret;
|
||||
tcall->Code = ParseActions(sc, state, statestring, bag, tcall->Proto, hasfinalret);
|
||||
if (!hasfinalret)
|
||||
tcall->Code = ParseActions(sc, state, statestring, bag, hasfinalret);
|
||||
if (!hasfinalret && tcall->Code != nullptr)
|
||||
{
|
||||
AddImplicitReturn(static_cast<FxSequence*>(tcall->Code), tcall->Proto, sc);
|
||||
static_cast<FxSequence *>(tcall->Code)->Add(new FxReturnStatement(nullptr, sc));
|
||||
}
|
||||
goto endofstate;
|
||||
}
|
||||
|
|
@ -351,125 +351,37 @@ endofstate:
|
|||
sc.SetEscape(true); // re-enable escape sequences
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
//
|
||||
// AddImplicitReturn
|
||||
//
|
||||
// Adds an implied return; statement to the end of a code sequence.
|
||||
//
|
||||
//==========================================================================
|
||||
|
||||
void AddImplicitReturn(FxSequence *code, const PPrototype *proto, FScanner &sc)
|
||||
{
|
||||
if (code == NULL)
|
||||
{
|
||||
return;
|
||||
}
|
||||
if (proto == NULL || proto->ReturnTypes.Size() == 0)
|
||||
{ // Returns nothing. Good. We can safely add an implied return.
|
||||
code->Add(new FxReturnStatement(NULL, sc));
|
||||
}
|
||||
else
|
||||
{ // Something was returned earlier in the sequence. Make it an error
|
||||
// instead of adding an implicit one.
|
||||
sc.ScriptError("Not all paths return a value");
|
||||
}
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
//
|
||||
// ReturnCheck
|
||||
//
|
||||
// If proto1 is NULL, returns proto2. If proto2 is NULL, returns proto1.
|
||||
// If neither is null, checks if both prototypes define the same return
|
||||
// types. If not, an error is flagged.
|
||||
//
|
||||
//==========================================================================
|
||||
|
||||
static PPrototype *ReturnCheck(PPrototype *proto1, PPrototype *proto2, FScanner &sc)
|
||||
{
|
||||
if (proto1 == NULL)
|
||||
{
|
||||
return proto2;
|
||||
}
|
||||
if (proto2 == NULL)
|
||||
{
|
||||
return proto1;
|
||||
}
|
||||
// A prototype that defines fewer return types can be compatible with
|
||||
// one that defines more if the shorter one matches the initial types
|
||||
// for the longer one.
|
||||
if (proto2->ReturnTypes.Size() < proto1->ReturnTypes.Size())
|
||||
{ // Make proto1 the shorter one to avoid code duplication below.
|
||||
swapvalues(proto1, proto2);
|
||||
}
|
||||
// If one prototype returns nothing, they both must.
|
||||
if (proto1->ReturnTypes.Size() == 0)
|
||||
{
|
||||
if (proto2->ReturnTypes.Size() == 0)
|
||||
{
|
||||
return proto1;
|
||||
}
|
||||
proto1 = NULL;
|
||||
}
|
||||
else
|
||||
{
|
||||
for (unsigned i = 0; i < proto1->ReturnTypes.Size(); ++i)
|
||||
{
|
||||
if (proto1->ReturnTypes[i] != proto2->ReturnTypes[i])
|
||||
{ // Incompatible
|
||||
proto1 = NULL;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (proto1 == NULL)
|
||||
{
|
||||
sc.ScriptError("Return types are incompatible");
|
||||
}
|
||||
return proto1;
|
||||
}
|
||||
|
||||
//==========================================================================
|
||||
//
|
||||
// ParseActions
|
||||
//
|
||||
// If this action block contains any return statements, the prototype for
|
||||
// one of them will be returned. This is used for deducing the return type
|
||||
// of anonymous functions. All called functions passed to return must have
|
||||
// matching return types.
|
||||
//
|
||||
//==========================================================================
|
||||
|
||||
static FxExpression *ParseIf(FScanner &sc, FState state, FString statestring, Baggage &bag,
|
||||
PPrototype *&retproto, bool &lastwasret)
|
||||
static FxExpression *ParseIf(FScanner &sc, FState state, FString statestring, Baggage &bag, bool &lastwasret)
|
||||
{
|
||||
FxExpression *add, *cond;
|
||||
FxExpression *true_part, *false_part = NULL;
|
||||
PPrototype *true_proto, *false_proto = NULL;
|
||||
FxExpression *true_part, *false_part = nullptr;
|
||||
bool true_ret, false_ret = false;
|
||||
sc.MustGetStringName("(");
|
||||
cond = ParseExpression(sc, bag.Info);
|
||||
sc.MustGetStringName(")");
|
||||
sc.MustGetStringName("{"); // braces are mandatory
|
||||
true_part = ParseActions(sc, state, statestring, bag, true_proto, true_ret);
|
||||
true_part = ParseActions(sc, state, statestring, bag, true_ret);
|
||||
sc.MustGetString();
|
||||
if (sc.Compare("else"))
|
||||
{
|
||||
if (sc.CheckString("if"))
|
||||
{
|
||||
false_part = ParseIf(sc, state, statestring, bag, false_proto, false_ret);
|
||||
false_part = ParseIf(sc, state, statestring, bag, false_ret);
|
||||
}
|
||||
else
|
||||
{
|
||||
sc.MustGetStringName("{"); // braces are still mandatory
|
||||
false_part = ParseActions(sc, state, statestring, bag, false_proto, false_ret);
|
||||
false_part = ParseActions(sc, state, statestring, bag, false_ret);
|
||||
sc.MustGetString();
|
||||
}
|
||||
}
|
||||
add = new FxIfStatement(cond, true_part, false_part, sc);
|
||||
retproto = ReturnCheck(retproto, true_proto, sc);
|
||||
retproto = ReturnCheck(retproto, false_proto, sc);
|
||||
// If one side does not end with a return, we don't consider the if statement
|
||||
// to end with a return. If the else case is missing, it can never be considered
|
||||
// as ending with a return.
|
||||
|
|
@ -480,11 +392,9 @@ static FxExpression *ParseIf(FScanner &sc, FState state, FString statestring, Ba
|
|||
return add;
|
||||
}
|
||||
|
||||
static FxExpression *ParseWhile(FScanner &sc, FState state, FString statestring, Baggage &bag,
|
||||
PPrototype *&retproto, bool &lastwasret)
|
||||
static FxExpression *ParseWhile(FScanner &sc, FState state, FString statestring, Baggage &bag, bool &lastwasret)
|
||||
{
|
||||
FxExpression *cond, *code;
|
||||
PPrototype *proto;
|
||||
bool ret;
|
||||
|
||||
sc.MustGetStringName("(");
|
||||
|
|
@ -492,24 +402,21 @@ static FxExpression *ParseWhile(FScanner &sc, FState state, FString statestring,
|
|||
sc.MustGetStringName(")");
|
||||
sc.MustGetStringName("{"); // Enforce braces like for if statements.
|
||||
|
||||
code = ParseActions(sc, state, statestring, bag, proto, ret);
|
||||
code = ParseActions(sc, state, statestring, bag, ret);
|
||||
sc.MustGetString();
|
||||
|
||||
retproto = ReturnCheck(retproto, proto, sc);
|
||||
lastwasret = false; // A while loop always jumps back.
|
||||
|
||||
return new FxWhileLoop(cond, code, sc);
|
||||
}
|
||||
|
||||
static FxExpression *ParseDoWhile(FScanner &sc, FState state, FString statestring, Baggage &bag,
|
||||
PPrototype *&retproto, bool &lastwasret)
|
||||
static FxExpression *ParseDoWhile(FScanner &sc, FState state, FString statestring, Baggage &bag, bool &lastwasret)
|
||||
{
|
||||
FxExpression *cond, *code;
|
||||
PPrototype *proto;
|
||||
bool ret;
|
||||
|
||||
sc.MustGetStringName("{"); // Enforce braces like for if statements.
|
||||
code = ParseActions(sc, state, statestring, bag, proto, ret);
|
||||
code = ParseActions(sc, state, statestring, bag, ret);
|
||||
|
||||
sc.MustGetStringName("while");
|
||||
sc.MustGetStringName("(");
|
||||
|
|
@ -518,20 +425,17 @@ static FxExpression *ParseDoWhile(FScanner &sc, FState state, FString statestrin
|
|||
sc.MustGetStringName(";");
|
||||
sc.MustGetString();
|
||||
|
||||
retproto = ReturnCheck(retproto, proto, sc);
|
||||
lastwasret = false;
|
||||
|
||||
return new FxDoWhileLoop(cond, code, sc);
|
||||
}
|
||||
|
||||
static FxExpression *ParseFor(FScanner &sc, FState state, FString statestring, Baggage &bag,
|
||||
PPrototype *&retproto, bool &lastwasret)
|
||||
static FxExpression *ParseFor(FScanner &sc, FState state, FString statestring, Baggage &bag, bool &lastwasret)
|
||||
{
|
||||
FxExpression *init = nullptr;
|
||||
FxExpression *cond = nullptr;
|
||||
FxExpression *iter = nullptr;
|
||||
FxExpression *code = nullptr;
|
||||
PPrototype *proto;
|
||||
bool ret;
|
||||
|
||||
// Parse the statements.
|
||||
|
|
@ -560,24 +464,21 @@ static FxExpression *ParseFor(FScanner &sc, FState state, FString statestring, B
|
|||
|
||||
// Now parse the loop's content.
|
||||
sc.MustGetStringName("{"); // Enforce braces like for if statements.
|
||||
code = ParseActions(sc, state, statestring, bag, proto, ret);
|
||||
code = ParseActions(sc, state, statestring, bag, ret);
|
||||
sc.MustGetString();
|
||||
|
||||
retproto = ReturnCheck(retproto, proto, sc);
|
||||
lastwasret = false;
|
||||
|
||||
return new FxForLoop(init, cond, iter, code, sc);
|
||||
}
|
||||
|
||||
FxExpression *ParseActions(FScanner &sc, FState state, FString statestring, Baggage &bag,
|
||||
PPrototype *&retproto, bool &endswithret)
|
||||
FxExpression *ParseActions(FScanner &sc, FState state, FString statestring, Baggage &bag, bool &endswithret)
|
||||
{
|
||||
// If it's not a '{', then it should be a single action.
|
||||
// Otherwise, it's a sequence of actions.
|
||||
if (!sc.Compare("{"))
|
||||
{
|
||||
FxVMFunctionCall *call = ParseAction(sc, state, statestring, bag);
|
||||
retproto = call->GetVMFunction()->Proto;
|
||||
endswithret = true;
|
||||
return new FxReturnStatement(call, sc);
|
||||
}
|
||||
|
|
@ -585,7 +486,6 @@ FxExpression *ParseActions(FScanner &sc, FState state, FString statestring, Bagg
|
|||
const FScriptPosition pos(sc);
|
||||
|
||||
FxSequence *seq = NULL;
|
||||
PPrototype *proto = NULL;
|
||||
bool lastwasret = false;
|
||||
|
||||
sc.MustGetString();
|
||||
|
|
@ -595,38 +495,31 @@ FxExpression *ParseActions(FScanner &sc, FState state, FString statestring, Bagg
|
|||
lastwasret = false;
|
||||
if (sc.Compare("if"))
|
||||
{ // Handle an if statement
|
||||
add = ParseIf(sc, state, statestring, bag, proto, lastwasret);
|
||||
add = ParseIf(sc, state, statestring, bag, lastwasret);
|
||||
}
|
||||
else if (sc.Compare("while"))
|
||||
{ // Handle a while loop
|
||||
add = ParseWhile(sc, state, statestring, bag, proto, lastwasret);
|
||||
add = ParseWhile(sc, state, statestring, bag, lastwasret);
|
||||
}
|
||||
else if (sc.Compare("do"))
|
||||
{ // Handle a do-while loop
|
||||
add = ParseDoWhile(sc, state, statestring, bag, proto, lastwasret);
|
||||
add = ParseDoWhile(sc, state, statestring, bag, lastwasret);
|
||||
}
|
||||
else if (sc.Compare("for"))
|
||||
{ // Handle a for loop
|
||||
add = ParseFor(sc, state, statestring, bag, proto, lastwasret);
|
||||
add = ParseFor(sc, state, statestring, bag, lastwasret);
|
||||
}
|
||||
else if (sc.Compare("return"))
|
||||
{ // Handle a return statement
|
||||
lastwasret = true;
|
||||
FxVMFunctionCall *retexp = NULL;
|
||||
PPrototype *retproto;
|
||||
FxExpression *retexp = nullptr;
|
||||
sc.MustGetString();
|
||||
if (!sc.Compare(";"))
|
||||
{
|
||||
retexp = ParseAction(sc, state, statestring, bag);
|
||||
sc.UnGet();
|
||||
retexp = ParseExpression(sc, bag.Info);
|
||||
sc.MustGetStringName(";");
|
||||
retproto = retexp->GetVMFunction()->Proto;
|
||||
}
|
||||
else
|
||||
{ // Returning nothing; we still need a prototype for that.
|
||||
TArray<PType *> notypes(0);
|
||||
retproto = NewPrototype(notypes, notypes);
|
||||
}
|
||||
proto = ReturnCheck(proto, retproto, sc);
|
||||
sc.MustGetString();
|
||||
add = new FxReturnStatement(retexp, sc);
|
||||
}
|
||||
|
|
@ -660,7 +553,6 @@ FxExpression *ParseActions(FScanner &sc, FState state, FString statestring, Bagg
|
|||
}
|
||||
}
|
||||
endswithret = lastwasret;
|
||||
retproto = proto;
|
||||
return seq;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue