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 "Integral.h" 13 #include "clang/AST/APValue.h" 14 #include "clang/AST/ComparisonCategories.h" 15 #include "llvm/ADT/APSInt.h" 16 #include "llvm/Support/MathExtras.h" 17 #include "llvm/Support/raw_ostream.h" 18 #include <cstddef> 19 #include <cstdint> 20 21 namespace clang { 22 namespace interp { 23 24 /// Wrapper around boolean types. 25 class Boolean final { 26 private: 27 /// Underlying boolean. 28 bool V; 29 30 public: 31 /// Zero-initializes a boolean. 32 Boolean() : V(false) {} 33 explicit Boolean(bool V) : V(V) {} 34 35 bool operator<(Boolean RHS) const { return V < RHS.V; } 36 bool operator>(Boolean RHS) const { return V > RHS.V; } 37 bool operator>(unsigned RHS) const { return static_cast<unsigned>(V) > RHS; } 38 39 Boolean operator-() const { return Boolean(V); } 40 Boolean operator-(const Boolean &Other) const { return Boolean(V - Other.V); } 41 Boolean operator~() const { return Boolean(true); } 42 Boolean operator!() const { return Boolean(!V); } 43 44 template <typename Ty, typename = std::enable_if_t<std::is_integral_v<Ty>>> 45 explicit operator Ty() const { 46 return V; 47 } 48 49 APSInt toAPSInt() const { 50 return APSInt(APInt(1, static_cast<uint64_t>(V), false), true); 51 } 52 APSInt toAPSInt(unsigned NumBits) const { 53 return APSInt(toAPSInt().zextOrTrunc(NumBits), true); 54 } 55 APValue toAPValue(const ASTContext &) const { return APValue(toAPSInt()); } 56 57 Boolean toUnsigned() const { return *this; } 58 59 constexpr static unsigned bitWidth() { return 1; } 60 bool isZero() const { return !V; } 61 bool isMin() const { return isZero(); } 62 63 constexpr static bool isMinusOne() { return false; } 64 65 constexpr static bool isSigned() { return false; } 66 67 constexpr static bool isNegative() { return false; } 68 constexpr static bool isPositive() { return !isNegative(); } 69 70 ComparisonCategoryResult compare(const Boolean &RHS) const { 71 return Compare(V, RHS.V); 72 } 73 74 unsigned countLeadingZeros() const { return V ? 0 : 1; } 75 76 Boolean truncate(unsigned TruncBits) const { return *this; } 77 78 static Boolean bitcastFromMemory(const std::byte *Buff, unsigned BitWidth) { 79 // Just load the first byte. 80 bool Val = static_cast<bool>(*Buff); 81 return Boolean(Val); 82 } 83 84 void bitcastToMemory(std::byte *Buff) { std::memcpy(Buff, &V, sizeof(V)); } 85 86 void print(llvm::raw_ostream &OS) const { OS << (V ? "true" : "false"); } 87 std::string toDiagnosticString(const ASTContext &Ctx) const { 88 std::string NameStr; 89 llvm::raw_string_ostream OS(NameStr); 90 print(OS); 91 return NameStr; 92 } 93 94 static Boolean min(unsigned NumBits) { return Boolean(false); } 95 static Boolean max(unsigned NumBits) { return Boolean(true); } 96 97 template <typename T> static Boolean from(T Value) { 98 if constexpr (std::is_integral<T>::value) 99 return Boolean(Value != 0); 100 return Boolean(static_cast<decltype(Boolean::V)>(Value) != 0); 101 } 102 103 template <unsigned SrcBits, bool SrcSign> 104 static std::enable_if_t<SrcBits != 0, Boolean> 105 from(Integral<SrcBits, SrcSign> Value) { 106 return Boolean(!Value.isZero()); 107 } 108 109 static Boolean zero() { return from(false); } 110 111 template <typename T> static Boolean from(T Value, unsigned NumBits) { 112 return Boolean(Value); 113 } 114 115 static bool inRange(int64_t Value, unsigned NumBits) { 116 return Value == 0 || Value == 1; 117 } 118 119 static bool increment(Boolean A, Boolean *R) { 120 *R = Boolean(true); 121 return false; 122 } 123 124 static bool decrement(Boolean A, Boolean *R) { 125 llvm_unreachable("Cannot decrement booleans"); 126 } 127 128 static bool add(Boolean A, Boolean B, unsigned OpBits, Boolean *R) { 129 *R = Boolean(A.V || B.V); 130 return false; 131 } 132 133 static bool sub(Boolean A, Boolean B, unsigned OpBits, Boolean *R) { 134 *R = Boolean(A.V ^ B.V); 135 return false; 136 } 137 138 static bool mul(Boolean A, Boolean B, unsigned OpBits, Boolean *R) { 139 *R = Boolean(A.V && B.V); 140 return false; 141 } 142 143 static bool inv(Boolean A, Boolean *R) { 144 *R = Boolean(!A.V); 145 return false; 146 } 147 148 static bool neg(Boolean A, Boolean *R) { 149 *R = Boolean(A.V); 150 return false; 151 } 152 }; 153 154 inline llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const Boolean &B) { 155 B.print(OS); 156 return OS; 157 } 158 159 } // namespace interp 160 } // namespace clang 161 162 #endif 163