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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) {
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());
}
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 && !Left->sameType(resolveType(Sig->Params[0].TypeName))) continue;
if (Right && !Right->sameType(resolveType(Sig->Params[Member ? 0 : 1].TypeName))) continue;
if (Result.Signature) Result.Ambiguous = true;
else Result.Signature = Sig;
}
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, false, true);
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) {
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;
};
if (Member) Args.push_back(Capture(Left, LeftType));
else {
if (LeftType->IsClass) Left = copyClassValue(LeftType, Capture(Left, LeftType), Transfers);
if (!Left) return nullptr;
Args.push_back(Left);
}
const TypeInfo *RightType = resolveType(Signature.Params[Member ? 0 : 1].TypeName);
if (RightType->IsClass) Right = copyClassValue(RightType, Capture(Right, RightType), Transfers);
if (!Right) return nullptr;
Args.push_back(Right);
transferObjects(Transfers);
return FuncGen->emitCall(Signature, Args);
}
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