clang  11.0.0git
Boolean.h
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1 //===--- Boolean.h - Wrapper for boolean types for the VM -------*- 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 #ifndef LLVM_CLANG_AST_INTERP_BOOLEAN_H
10 #define LLVM_CLANG_AST_INTERP_BOOLEAN_H
11 
12 #include <cstddef>
13 #include <cstdint>
14 #include "Integral.h"
15 #include "clang/AST/APValue.h"
17 #include "llvm/ADT/APSInt.h"
18 #include "llvm/Support/MathExtras.h"
19 #include "llvm/Support/raw_ostream.h"
20 
21 namespace clang {
22 namespace interp {
23 
24 /// Wrapper around boolean types.
25 class Boolean {
26  private:
27  /// Underlying boolean.
28  bool V;
29 
30  /// Construct a wrapper from a boolean.
31  explicit Boolean(bool V) : V(V) {}
32 
33  public:
34  /// Zero-initializes a boolean.
35  Boolean() : V(false) {}
36 
37  bool operator<(Boolean RHS) const { return V < RHS.V; }
38  bool operator>(Boolean RHS) const { return V > RHS.V; }
39  bool operator<=(Boolean RHS) const { return V <= RHS.V; }
40  bool operator>=(Boolean RHS) const { return V >= RHS.V; }
41  bool operator==(Boolean RHS) const { return V == RHS.V; }
42  bool operator!=(Boolean RHS) const { return V != RHS.V; }
43 
44  bool operator>(unsigned RHS) const { return static_cast<unsigned>(V) > RHS; }
45 
46  Boolean operator-() const { return Boolean(V); }
47  Boolean operator~() const { return Boolean(true); }
48 
49  explicit operator unsigned() const { return V; }
50  explicit operator int64_t() const { return V; }
51  explicit operator uint64_t() const { return V; }
52 
53  APSInt toAPSInt() const {
54  return APSInt(APInt(1, static_cast<uint64_t>(V), false), true);
55  }
56  APSInt toAPSInt(unsigned NumBits) const {
57  return APSInt(toAPSInt().zextOrTrunc(NumBits), true);
58  }
59  APValue toAPValue() const { return APValue(toAPSInt()); }
60 
61  Boolean toUnsigned() const { return *this; }
62 
63  constexpr static unsigned bitWidth() { return true; }
64  bool isZero() const { return !V; }
65  bool isMin() const { return isZero(); }
66 
67  constexpr static bool isMinusOne() { return false; }
68 
69  constexpr static bool isSigned() { return false; }
70 
71  constexpr static bool isNegative() { return false; }
72  constexpr static bool isPositive() { return !isNegative(); }
73 
75  return Compare(V, RHS.V);
76  }
77 
78  unsigned countLeadingZeros() const { return V ? 0 : 1; }
79 
80  Boolean truncate(unsigned TruncBits) const { return *this; }
81 
82  void print(llvm::raw_ostream &OS) const { OS << (V ? "true" : "false"); }
83 
84  static Boolean min(unsigned NumBits) { return Boolean(false); }
85  static Boolean max(unsigned NumBits) { return Boolean(true); }
86 
87  template <typename T>
88  static std::enable_if_t<std::is_integral<T>::value, Boolean> from(T Value) {
89  return Boolean(Value != 0);
90  }
91 
92  template <unsigned SrcBits, bool SrcSign>
93  static std::enable_if_t<SrcBits != 0, Boolean>
95  return Boolean(!Value.isZero());
96  }
97 
98  template <bool SrcSign>
100  return Boolean(!Value.isZero());
101  }
102 
103  static Boolean zero() { return from(false); }
104 
105  template <typename T>
106  static Boolean from(T Value, unsigned NumBits) {
107  return Boolean(Value);
108  }
109 
110  static bool inRange(int64_t Value, unsigned NumBits) {
111  return Value == 0 || Value == 1;
112  }
113 
114  static bool increment(Boolean A, Boolean *R) {
115  *R = Boolean(true);
116  return false;
117  }
118 
119  static bool decrement(Boolean A, Boolean *R) {
120  llvm_unreachable("Cannot decrement booleans");
121  }
122 
123  static bool add(Boolean A, Boolean B, unsigned OpBits, Boolean *R) {
124  *R = Boolean(A.V || B.V);
125  return false;
126  }
127 
128  static bool sub(Boolean A, Boolean B, unsigned OpBits, Boolean *R) {
129  *R = Boolean(A.V ^ B.V);
130  return false;
131  }
132 
133  static bool mul(Boolean A, Boolean B, unsigned OpBits, Boolean *R) {
134  *R = Boolean(A.V && B.V);
135  return false;
136  }
137 };
138 
139 inline llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const Boolean &B) {
140  B.print(OS);
141  return OS;
142 }
143 
144 } // namespace interp
145 } // namespace clang
146 
147 #endif
Boolean()
Zero-initializes a boolean.
Definition: Boolean.h:35
bool isZero() const
Definition: Boolean.h:64
static bool increment(Boolean A, Boolean *R)
Definition: Boolean.h:114
ComparisonCategoryResult compare(const Boolean &RHS) const
Definition: Boolean.h:74
static std::enable_if_t< std::is_integral< T >::value, Boolean > from(T Value)
Definition: Boolean.h:88
static Boolean min(unsigned NumBits)
Definition: Boolean.h:84
Wrapper around numeric types.
Definition: Integral.h:56
bool operator>(unsigned RHS) const
Definition: Boolean.h:44
Wrapper around boolean types.
Definition: Boolean.h:25
Boolean truncate(unsigned TruncBits) const
Definition: Boolean.h:80
bool operator!=(Boolean RHS) const
Definition: Boolean.h:42
static bool inRange(int64_t Value, unsigned NumBits)
Definition: Boolean.h:110
bool isZero() const
Definition: Integral.h:123
ComparisonCategoryResult
An enumeration representing the possible results of a three-way comparison.
static Boolean from(Integral< 0, SrcSign > Value)
Definition: Boolean.h:99
APValue toAPValue() const
Definition: Boolean.h:59
static bool add(Boolean A, Boolean B, unsigned OpBits, Boolean *R)
Definition: Boolean.h:123
Boolean operator-() const
Definition: Boolean.h:46
void print(llvm::raw_ostream &OS) const
Definition: Boolean.h:82
static std::enable_if_t< SrcBits !=0, Boolean > from(Integral< SrcBits, SrcSign > Value)
Definition: Boolean.h:94
static constexpr bool isSigned()
Definition: Boolean.h:69
static Boolean zero()
Definition: Boolean.h:103
static Boolean from(T Value, unsigned NumBits)
Definition: Boolean.h:106
APSInt toAPSInt(unsigned NumBits) const
Definition: Boolean.h:56
bool operator>=(Boolean RHS) const
Definition: Boolean.h:40
static constexpr bool isPositive()
Definition: Boolean.h:72
static constexpr unsigned bitWidth()
Definition: Boolean.h:63
llvm::APSInt APSInt
Definition: Integral.h:28
#define false
Definition: stdbool.h:17
static bool decrement(Boolean A, Boolean *R)
Definition: Boolean.h:119
Boolean operator~() const
Definition: Boolean.h:47
APSInt toAPSInt() const
Definition: Boolean.h:53
Boolean toUnsigned() const
Definition: Boolean.h:61
llvm::APInt APInt
Definition: Integral.h:27
static constexpr bool isMinusOne()
Definition: Boolean.h:67
bool isMin() const
Definition: Boolean.h:65
ComparisonCategoryResult Compare(const T &X, const T &Y)
Helper to compare two comparable types.
Definition: Integral.h:32
Dataflow Directional Tag Classes.
bool operator<(Boolean RHS) const
Definition: Boolean.h:37
bool operator>(Boolean RHS) const
Definition: Boolean.h:38
static bool sub(Boolean A, Boolean B, unsigned OpBits, Boolean *R)
Definition: Boolean.h:128
llvm::raw_ostream & operator<<(llvm::raw_ostream &OS, const Boolean &B)
Definition: Boolean.h:139
APValue - This class implements a discriminated union of [uninitialized] [APSInt] [APFloat]...
Definition: APValue.h:115
static constexpr bool isNegative()
Definition: Boolean.h:71
bool operator==(Boolean RHS) const
Definition: Boolean.h:41
bool operator<=(Boolean RHS) const
Definition: Boolean.h:39
static Boolean max(unsigned NumBits)
Definition: Boolean.h:85
static bool mul(Boolean A, Boolean B, unsigned OpBits, Boolean *R)
Definition: Boolean.h:133
unsigned countLeadingZeros() const
Definition: Boolean.h:78