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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195``` ```//===-- llvm/Support/ConstantRange.h - Represent a range --------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // Represent a range of possible values that may occur when the program is run // for an integral value. This keeps track of a lower and upper bound for the // constant, which MAY wrap around the end of the numeric range. To do this, it // keeps track of a [lower, upper) bound, which specifies an interval just like // STL iterators. When used with boolean values, the following are important // ranges: : // // [F, F) = {} = Empty set // [T, F) = {T} // [F, T) = {F} // [T, T) = {F, T} = Full set // // The other integral ranges use min/max values for special range values. For // example, for 8-bit types, it uses: // [0, 0) = {} = Empty set // [255, 255) = {0..255} = Full Set // // Note that ConstantRange always keeps unsigned values. //===----------------------------------------------------------------------===// #ifndef LLVM_SUPPORT_CONSTANT_RANGE_H #define LLVM_SUPPORT_CONSTANT_RANGE_H #include "llvm/ADT/APInt.h" #include "llvm/Support/DataTypes.h" namespace llvm { class ConstantRange { APInt Lower, Upper; static ConstantRange intersect1Wrapped(const ConstantRange &LHS, const ConstantRange &RHS); public: /// Initialize a full (the default) or empty set for the specified bit width. /// explicit ConstantRange(uint32_t BitWidth, bool isFullSet = true); /// Initialize a range to hold the single specified value. /// ConstantRange(const APInt &Value); /// @brief Initialize a range of values explicitly. This will assert out if /// Lower==Upper and Lower != Min or Max value for its type. It will also /// assert out if the two APInt's are not the same bit width. ConstantRange(const APInt& Lower, const APInt& Upper); /// getLower - Return the lower value for this range... /// const APInt &getLower() const { return Lower; } /// getUpper - Return the upper value for this range... /// const APInt &getUpper() const { return Upper; } /// getBitWidth - get the bit width of this ConstantRange /// uint32_t getBitWidth() const { return Lower.getBitWidth(); } /// isFullSet - Return true if this set contains all of the elements possible /// for this data-type /// bool isFullSet() const; /// isEmptySet - Return true if this set contains no members. /// bool isEmptySet() const; /// isWrappedSet - Return true if this set wraps around the top of the range, /// for example: [100, 8) /// bool isWrappedSet() const; /// contains - Return true if the specified value is in the set. /// bool contains(const APInt &Val) const; /// getSingleElement - If this set contains a single element, return it, /// otherwise return null. /// const APInt *getSingleElement() const { if (Upper == Lower + 1) return &Lower; return 0; } /// isSingleElement - Return true if this set contains exactly one member. /// bool isSingleElement() const { return getSingleElement() != 0; } /// getSetSize - Return the number of elements in this set. /// APInt getSetSize() const; /// getUnsignedMax - Return the largest unsigned value contained in the /// ConstantRange. /// APInt getUnsignedMax() const; /// getUnsignedMin - Return the smallest unsigned value contained in the /// ConstantRange. /// APInt getUnsignedMin() const; /// getSignedMax - Return the largest signed value contained in the /// ConstantRange. /// APInt getSignedMax() const; /// getSignedMin - Return the smallest signed value contained in the /// ConstantRange. /// APInt getSignedMin() const; /// operator== - Return true if this range is equal to another range. /// bool operator==(const ConstantRange &CR) const { return Lower == CR.Lower && Upper == CR.Upper; } bool operator!=(const ConstantRange &CR) const { return !operator==(CR); } /// subtract - Subtract the specified constant from the endpoints of this /// constant range. ConstantRange subtract(const APInt &CI) const; /// intersectWith - Return the range that results from the intersection of /// this range with another range. The resultant range is pruned as much as /// possible, but there may be cases where elements are included that are in /// one of the sets but not the other. For example: [100, 8) intersect [3, /// 120) yields [3, 120) /// ConstantRange intersectWith(const ConstantRange &CR) const; /// maximalIntersectWith - Return the range that results from the intersection /// of this range with another range. The resultant range is guaranteed to /// include all elements contained in both input ranges, and to have the /// smallest possible set size that does so. Because there may be two /// intersections with the same set size, A.maximalIntersectWith(B) might not /// be equal to B.maximalIntersectWith(A). /// ConstantRange maximalIntersectWith(const ConstantRange &CR) const; /// unionWith - Return the range that results from the union of this range /// with another range. The resultant range is guaranteed to include the /// elements of both sets, but may contain more. For example, [3, 9) union /// [12,15) is [3, 15), which includes 9, 10, and 11, which were not included /// in either set before. /// ConstantRange unionWith(const ConstantRange &CR) const; /// zeroExtend - Return a new range in the specified integer type, which must /// be strictly larger than the current type. The returned range will /// correspond to the possible range of values if the source range had been /// zero extended to BitWidth. ConstantRange zeroExtend(uint32_t BitWidth) const; /// signExtend - Return a new range in the specified integer type, which must /// be strictly larger than the current type. The returned range will /// correspond to the possible range of values if the source range had been /// sign extended to BitWidth. ConstantRange signExtend(uint32_t BitWidth) const; /// truncate - Return a new range in the specified integer type, which must be /// strictly smaller than the current type. The returned range will /// correspond to the possible range of values if the source range had been /// truncated to the specified type. ConstantRange truncate(uint32_t BitWidth) const; /// print - Print out the bounds to a stream... /// void print(raw_ostream &OS) const; /// dump - Allow printing from a debugger easily... /// void dump() const; }; inline raw_ostream &operator<<(raw_ostream &OS, const ConstantRange &CR) { CR.print(OS); return OS; } } // End llvm namespace #endif ```