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//===--- FunctionPointer.h - Types for the constexpr VM ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_INTERP_FUNCTION_POINTER_H
#define LLVM_CLANG_AST_INTERP_FUNCTION_POINTER_H
#include "Function.h"
#include "Primitives.h"
#include "clang/AST/APValue.h"
namespace clang {
class ASTContext;
namespace interp {
class FunctionPointer final {
private:
const Function *Func;
bool Valid;
public:
FunctionPointer(const Function *Func) : Func(Func), Valid(true) {
assert(Func);
}
FunctionPointer(uintptr_t IntVal = 0, const Descriptor *Desc = nullptr)
: Func(reinterpret_cast<const Function *>(IntVal)), Valid(false) {}
const Function *getFunction() const { return Func; }
bool isZero() const { return !Func; }
bool isValid() const { return Valid; }
bool isWeak() const {
if (!Func || !Valid)
return false;
return Func->getDecl()->isWeak();
}
APValue toAPValue(const ASTContext &) const {
if (!Func)
return APValue(static_cast<Expr *>(nullptr), CharUnits::Zero(), {},
/*OnePastTheEnd=*/false, /*IsNull=*/true);
if (!Valid)
return APValue(static_cast<Expr *>(nullptr),
CharUnits::fromQuantity(getIntegerRepresentation()), {},
/*OnePastTheEnd=*/false, /*IsNull=*/false);
return APValue(Func->getDecl(), CharUnits::Zero(), {},
/*OnePastTheEnd=*/false, /*IsNull=*/false);
}
void print(llvm::raw_ostream &OS) const {
OS << "FnPtr(";
if (Func && Valid)
OS << Func->getName();
else if (Func)
OS << reinterpret_cast<uintptr_t>(Func);
else
OS << "nullptr";
OS << ")";
}
std::string toDiagnosticString(const ASTContext &Ctx) const {
if (!Func)
return "nullptr";
return toAPValue(Ctx).getAsString(Ctx, Func->getDecl()->getType());
}
uint64_t getIntegerRepresentation() const {
return static_cast<uint64_t>(reinterpret_cast<uintptr_t>(Func));
}
ComparisonCategoryResult compare(const FunctionPointer &RHS) const {
if (Func == RHS.Func)
return ComparisonCategoryResult::Equal;
return ComparisonCategoryResult::Unordered;
}
};
inline llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
FunctionPointer FP) {
FP.print(OS);
return OS;
}
} // namespace interp
} // namespace clang
#endif
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