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#include "cps/CodeGen.h"
#include "cps/Operator.h"
#include "cps/TypeAST.h"
using namespace cps;
using namespace llvm;
// Probing candidates must not evaluate operands or diagnose absent overloads:
// both static typing and emission use this same selection.
CodeGen::OperatorResolution CodeGen::resolveOperator(
int Op, const TypeInfo *Left, const TypeInfo *Right, const ResultContext *Context) {
OperatorResolution Result;
if (!Left) return Result;
auto Candidates = FuncGen->getOverloads(operatorName(Op));
if (Left->IsClass) {
auto Members = FuncGen->getOverloads(Left->Name + "." + operatorName(Op));
Candidates.insert(Candidates.end(), Members.begin(), Members.end());
}
auto Accepts = [&](const TypeInfo *Actual, const ParamSig &Param, bool Lenient) {
const TypeInfo *Formal = resolveType(Param.TypeName);
if (Actual->sameType(Formal)) return true;
// Keep builtin CHAR comparisons ahead of STRING construction.
if (Right && Left->Kind == TypeKind::Char && Right->Kind == TypeKind::Char &&
Op != '&' && Formal && Formal->isString()) return false;
return Lenient && !Param.IsByRef && !Param.IsArray && implicitConversionRank(Actual, Formal) == 1;
};
// Builtin operations on exact operand types precede converted overloads.
// Raw C text is the exception: visible STRING operators supply text semantics.
auto Numeric = [](const TypeInfo *T) {
return T && (T->Kind == TypeKind::Integer || T->Kind == TypeKind::Real);
};
bool Comparison = Op == tok_eq || Op == tok_ne || Op == '<' || Op == '>' ||
Op == tok_le || Op == tok_ge;
bool Builtin = false;
if (!Right) {
Builtin = (Op == '-' && Numeric(Left)) ||
(Op == tok_not && Left->Kind == TypeKind::Boolean) ||
Left->Kind == TypeKind::CScalar;
} else {
Builtin = (Numeric(Left) && Numeric(Right) &&
(Comparison || Op == '+' || Op == '-' || Op == '*' || Op == '/' ||
Op == tok_div || Op == tok_mod)) ||
(Left->sameType(Right) &&
((Comparison && (Left->Kind == TypeKind::Char ||
Left->Kind == TypeKind::Boolean || Left->isEnum())) ||
((Op == tok_and || Op == tok_or) && Left->Kind == TypeKind::Boolean) ||
((Op == tok_eq || Op == tok_ne) && Left->isPointer() &&
Left->CIdentity != "char*"))) ||
(Left->Kind == TypeKind::CScalar && Right->Kind == TypeKind::CScalar) ||
(Left->isEnum() && Right->Kind == TypeKind::Integer && (Op == '+' || Op == '-'));
}
const bool PreferResult = Context && Context->Type;
auto ReturnsWanted = [&](const FuncSig *Sig) {
const TypeInfo *Ret = resolveType(Sig->ReturnTypeName);
return Ret && Ret->sameType(Context->Type);
};
bool ParamMatched = false;
auto RunLayers = [&](bool FilterReturn) {
Result.Signature = nullptr;
Result.Ambiguous = false;
for (bool Lenient : {false, true}) {
if (Lenient && Builtin) break;
const FuncSig *Selected = nullptr;
int Count = 0;
std::vector<const FuncSig *> Matches;
for (const FuncSig *Sig : Candidates) {
bool Member = !Sig->Prototype->getOwnerClass().empty();
if (Sig->Prototype->getOperator() != Op ||
Sig->Params.size() != (Right ? 2u : 1u) - Member) continue;
if (!Member && !Accepts(Left, Sig->Params[0], Lenient)) continue;
if (Right && !Accepts(Right, Sig->Params[Member ? 0 : 1], Lenient)) continue;
ParamMatched = true;
if (FilterReturn && !ReturnsWanted(Sig)) continue;
++Count;
Matches.push_back(Sig);
if (!Selected) Selected = Sig;
}
if (!FilterReturn && Count > 1) {
if (const FuncSig *Default = FunctionGen::selectDefaultReturn(Matches)) {
Selected = Default;
Count = 1;
}
}
if (Selected) {
Result.Signature = Selected;
Result.Ambiguous = Count > 1;
break;
}
}
};
if (PreferResult) {
RunLayers(true);
if (Result.Signature || Result.Ambiguous) return Result;
}
if (!Context || !Context->Exact) {
RunLayers(false);
} else if (ParamMatched) {
Result.WrongResult = true;
}
return Result;
}
bool CodeGen::checkOperatorAccess(const FuncSig &Signature) {
const PrototypeAST *Proto = Signature.Prototype;
if (!Proto->getOwnerClass().empty() && !Proto->isPublic() &&
!sameIdentifier(CurrentClass, Proto->getOwnerClass())) {
reportError("Cannot access private method %s of type %s",
Proto->getName().c_str(), Proto->getOwnerClass().c_str());
return false;
}
return true;
}
Value *CodeGen::materializeOperatorReceiver(Value *Val, const TypeInfo *Type) {
if (!Val || !Type) return nullptr;
auto *Storage = CreateEntryBlockAlloca(Builder->GetInsertBlock()->getParent(),
Type->LLVMType, "operator_receiver");
size_t Object = registerStackObject(Storage, Type->Name, DiagnosticLine);
Builder->CreateStore(Val, Storage);
activateStackObject(Object);
if (Object != size_t(-1)) StackObjects[Object].Temporary = true;
return Storage;
}
Value *CodeGen::emitOperatorCall(const FuncSig &Signature, ExprAST *Left, ExprAST *Right) {
if (!checkOperatorAccess(Signature)) return nullptr;
std::vector<Value*> Args;
std::vector<ExprAST*> Explicit;
if (Signature.Prototype->getOwnerClass().empty()) {
Explicit.push_back(Left);
} else {
Value *Receiver = nullptr;
if (dynamic_cast<VariableExprAST*>(Left) || dynamic_cast<ArrayAccessExprAST*>(Left) ||
dynamic_cast<DesignatorExprAST*>(Left)) {
LValueInfo LV;
if (!emitLValue(Left, LV)) return nullptr;
Receiver = LV.Addr;
} else {
Receiver = materializeOperatorReceiver(emitExpr(Left), getExprTypeInfo(Left));
}
if (!Receiver) return nullptr;
Args.push_back(Receiver);
}
if (Right) Explicit.push_back(Right);
if (!marshalCallArgs(Signature, Explicit, DiagnosticLine, Args)) return nullptr;
return FuncGen->emitCall(Signature, Args);
}
// CASE has already evaluated and captured its selector and label values.
Value *CodeGen::emitOperatorValues(const FuncSig &Signature, Value *Left,
const TypeInfo *LeftType, Value *Right, const TypeInfo *ActualRightType) {
if (!checkOperatorAccess(Signature)) return nullptr;
bool Member = !Signature.Prototype->getOwnerClass().empty();
std::vector<Value *> Args;
std::vector<size_t> Transfers;
auto Capture = [&](Value *Val, const TypeInfo *Type) -> Value * {
auto *Slot = CreateEntryBlockAlloca(Builder->GetInsertBlock()->getParent(),
Type->LLVMType, "case_operand");
Builder->CreateStore(Val, Slot);
return Slot;
};
auto Prepare = [&](Value *Val, const TypeInfo *Actual, const TypeInfo *Formal) -> Value * {
if (!Val || !Actual || !Formal) return nullptr;
if (!Actual->sameType(Formal)) {
const FuncSig *Constructor = findImplicitConstructor(Actual, Formal);
if (!Constructor) return nullptr;
std::vector<size_t> SourceTransfers;
if (Actual->IsClass || containsString(Actual))
Val = copyClassValue(Actual, Capture(Val, Actual), SourceTransfers);
Val = emitImplicitConstruct(*Constructor, Formal, Val, SourceTransfers);
if (!Val) return nullptr;
materializeOperatorReceiver(Val, Formal);
if (typeNeedsDestruction(Formal->Name)) Transfers.push_back(StackObjects.size() - 1);
} else if (Formal->IsClass || containsString(Formal)) {
Val = copyClassValue(Formal, Capture(Val, Formal), Transfers);
}
return Val;
};
if (Member) Args.push_back(Capture(Left, LeftType));
else {
Left = Prepare(Left, LeftType, resolveType(Signature.Params[0].TypeName));
if (!Left) return nullptr;
Args.push_back(Left);
}
const TypeInfo *RightType = resolveType(Signature.Params[Member ? 0 : 1].TypeName);
Right = Prepare(Right, ActualRightType, RightType);
if (!Right) return nullptr;
Args.push_back(Right);
transferObjects(Transfers);
return FuncGen->emitCall(Signature, Args);
}
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