/usr/include/llvm-5.0/llvm/IR/TrackingMDRef.h is in llvm-5.0-dev 1:5.0.1-4.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | //===- llvm/IR/TrackingMDRef.h - Tracking Metadata references ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// References to metadata that track RAUW.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_TRACKINGMDREF_H
#define LLVM_IR_TRACKINGMDREF_H
#include "llvm/IR/Metadata.h"
#include <algorithm>
#include <cassert>
namespace llvm {
/// \brief Tracking metadata reference.
///
/// This class behaves like \a TrackingVH, but for metadata.
class TrackingMDRef {
Metadata *MD = nullptr;
public:
TrackingMDRef() = default;
explicit TrackingMDRef(Metadata *MD) : MD(MD) { track(); }
TrackingMDRef(TrackingMDRef &&X) : MD(X.MD) { retrack(X); }
TrackingMDRef(const TrackingMDRef &X) : MD(X.MD) { track(); }
TrackingMDRef &operator=(TrackingMDRef &&X) {
if (&X == this)
return *this;
untrack();
MD = X.MD;
retrack(X);
return *this;
}
TrackingMDRef &operator=(const TrackingMDRef &X) {
if (&X == this)
return *this;
untrack();
MD = X.MD;
track();
return *this;
}
~TrackingMDRef() { untrack(); }
Metadata *get() const { return MD; }
operator Metadata *() const { return get(); }
Metadata *operator->() const { return get(); }
Metadata &operator*() const { return *get(); }
void reset() {
untrack();
MD = nullptr;
}
void reset(Metadata *MD) {
untrack();
this->MD = MD;
track();
}
/// \brief Check whether this has a trivial destructor.
///
/// If \c MD isn't replaceable, the destructor will be a no-op.
bool hasTrivialDestructor() const {
return !MD || !MetadataTracking::isReplaceable(*MD);
}
bool operator==(const TrackingMDRef &X) const { return MD == X.MD; }
bool operator!=(const TrackingMDRef &X) const { return MD != X.MD; }
private:
void track() {
if (MD)
MetadataTracking::track(MD);
}
void untrack() {
if (MD)
MetadataTracking::untrack(MD);
}
void retrack(TrackingMDRef &X) {
assert(MD == X.MD && "Expected values to match");
if (X.MD) {
MetadataTracking::retrack(X.MD, MD);
X.MD = nullptr;
}
}
};
/// \brief Typed tracking ref.
///
/// Track refererences of a particular type. It's useful to use this for \a
/// MDNode and \a ValueAsMetadata.
template <class T> class TypedTrackingMDRef {
TrackingMDRef Ref;
public:
TypedTrackingMDRef() = default;
explicit TypedTrackingMDRef(T *MD) : Ref(static_cast<Metadata *>(MD)) {}
TypedTrackingMDRef(TypedTrackingMDRef &&X) : Ref(std::move(X.Ref)) {}
TypedTrackingMDRef(const TypedTrackingMDRef &X) : Ref(X.Ref) {}
TypedTrackingMDRef &operator=(TypedTrackingMDRef &&X) {
Ref = std::move(X.Ref);
return *this;
}
TypedTrackingMDRef &operator=(const TypedTrackingMDRef &X) {
Ref = X.Ref;
return *this;
}
T *get() const { return (T *)Ref.get(); }
operator T *() const { return get(); }
T *operator->() const { return get(); }
T &operator*() const { return *get(); }
bool operator==(const TypedTrackingMDRef &X) const { return Ref == X.Ref; }
bool operator!=(const TypedTrackingMDRef &X) const { return Ref != X.Ref; }
void reset() { Ref.reset(); }
void reset(T *MD) { Ref.reset(static_cast<Metadata *>(MD)); }
/// \brief Check whether this has a trivial destructor.
bool hasTrivialDestructor() const { return Ref.hasTrivialDestructor(); }
};
using TrackingMDNodeRef = TypedTrackingMDRef<MDNode>;
using TrackingValueAsMetadataRef = TypedTrackingMDRef<ValueAsMetadata>;
// Expose the underlying metadata to casting.
template <> struct simplify_type<TrackingMDRef> {
using SimpleType = Metadata *;
static SimpleType getSimplifiedValue(TrackingMDRef &MD) { return MD.get(); }
};
template <> struct simplify_type<const TrackingMDRef> {
using SimpleType = Metadata *;
static SimpleType getSimplifiedValue(const TrackingMDRef &MD) {
return MD.get();
}
};
template <class T> struct simplify_type<TypedTrackingMDRef<T>> {
using SimpleType = T *;
static SimpleType getSimplifiedValue(TypedTrackingMDRef<T> &MD) {
return MD.get();
}
};
template <class T> struct simplify_type<const TypedTrackingMDRef<T>> {
using SimpleType = T *;
static SimpleType getSimplifiedValue(const TypedTrackingMDRef<T> &MD) {
return MD.get();
}
};
} // end namespace llvm
#endif // LLVM_IR_TRACKINGMDREF_H
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