Value.cpp revision 1.1.1.1 
1//===-- Value.cpp -----------------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file defines support functions for the `Value` type.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Analysis/FlowSensitive/Value.h"
14#include "clang/Analysis/FlowSensitive/DebugSupport.h"
15#include "llvm/Support/Casting.h"
16
17namespace clang {
18namespace dataflow {
19
20static bool areEquivalentIndirectionValues(const Value &Val1,
21                                           const Value &Val2) {
22  if (auto *IndVal1 = dyn_cast<ReferenceValue>(&Val1)) {
23    auto *IndVal2 = cast<ReferenceValue>(&Val2);
24    return &IndVal1->getReferentLoc() == &IndVal2->getReferentLoc();
25  }
26  if (auto *IndVal1 = dyn_cast<PointerValue>(&Val1)) {
27    auto *IndVal2 = cast<PointerValue>(&Val2);
28    return &IndVal1->getPointeeLoc() == &IndVal2->getPointeeLoc();
29  }
30  return false;
31}
32
33bool areEquivalentValues(const Value &Val1, const Value &Val2) {
34  return &Val1 == &Val2 || (Val1.getKind() == Val2.getKind() &&
35                            (isa<TopBoolValue>(&Val1) ||
36                             areEquivalentIndirectionValues(Val1, Val2)));
37}
38
39raw_ostream &operator<<(raw_ostream &OS, const Value &Val) {
40  switch (Val.getKind()) {
41  case Value::Kind::Reference: {
42    const auto *RV = cast<ReferenceValue>(&Val);
43    return OS << "Reference(" << &RV->getReferentLoc() << ")";
44  }
45  case Value::Kind::Pointer: {
46    const auto *PV = dyn_cast<PointerValue>(&Val);
47    return OS << "Pointer(" << &PV->getPointeeLoc() << ")";
48  }
49  // FIXME: support remaining cases.
50  default:
51    return OS << debugString(Val.getKind());
52  }
53}
54
55} // namespace dataflow
56} // namespace clang
57