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//===-------------- TypeOrdering.h - Total ordering for types ---*- 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Allows QualTypes to be sorted and hence used in maps and sets.
///
/// Defines clang::QualTypeOrdering, a total ordering on clang::QualType,
/// and hence enables QualType values to be sorted and to be used in
/// std::maps, std::sets, llvm::DenseMaps, and llvm::DenseSets.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_TYPEORDERING_H
#define LLVM_CLANG_AST_TYPEORDERING_H
#include "clang/AST/CanonicalType.h"
#include "clang/AST/Type.h"
#include <functional>
namespace clang {
/// Function object that provides a total ordering on QualType values.
struct QualTypeOrdering {
bool operator()(QualType T1, QualType T2) const {
return std::less<void*>()(T1.getAsOpaquePtr(), T2.getAsOpaquePtr());
}
};
}
namespace llvm {
template<class> struct DenseMapInfo;
template<> struct DenseMapInfo<clang::QualType> {
static inline clang::QualType getEmptyKey() { return clang::QualType(); }
static inline clang::QualType getTombstoneKey() {
using clang::QualType;
return QualType::getFromOpaquePtr(reinterpret_cast<clang::Type *>(-1));
}
static unsigned getHashValue(clang::QualType Val) {
return (unsigned)((uintptr_t)Val.getAsOpaquePtr()) ^
((unsigned)((uintptr_t)Val.getAsOpaquePtr() >> 9));
}
static bool isEqual(clang::QualType LHS, clang::QualType RHS) {
return LHS == RHS;
}
};
template<> struct DenseMapInfo<clang::CanQualType> {
static inline clang::CanQualType getEmptyKey() {
return clang::CanQualType();
}
static inline clang::CanQualType getTombstoneKey() {
using clang::CanQualType;
return CanQualType::getFromOpaquePtr(reinterpret_cast<clang::Type *>(-1));
}
static unsigned getHashValue(clang::CanQualType Val) {
return (unsigned)((uintptr_t)Val.getAsOpaquePtr()) ^
((unsigned)((uintptr_t)Val.getAsOpaquePtr() >> 9));
}
static bool isEqual(clang::CanQualType LHS, clang::CanQualType RHS) {
return LHS == RHS;
}
};
}
#endif
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