1 // RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -verify -analyzer-constraints=range %s 2 3 void clang_analyzer_eval(int); 4 5 #define UINT_MAX (~0U) 6 #define INT_MAX (UINT_MAX & (UINT_MAX >> 1)) 7 #define INT_MIN (-INT_MAX - 1) 8 9 10 // Each of these adjusted ranges has an adjustment small enough to split the 11 // solution range across an overflow boundary (Min for <, Max for >). 12 // This corresponds to one set of branches in RangeConstraintManager. 13 void smallAdjustmentGT (unsigned a) { 14 if (a+2 > 1) 15 clang_analyzer_eval(a < UINT_MAX-1); // expected-warning{{TRUE}} 16 else 17 clang_analyzer_eval(a == UINT_MAX-1 || a == UINT_MAX); // expected-warning{{TRUE}} 18 } 19 20 void smallAdjustmentGE (unsigned a) { 21 if (a+2 >= 1) 22 clang_analyzer_eval(a < UINT_MAX-1 || a == UINT_MAX); // expected-warning{{TRUE}} 23 else 24 clang_analyzer_eval(a == UINT_MAX-1); // expected-warning{{TRUE}} 25 } 26 27 void smallAdjustmentLT (unsigned a) { 28 if (a+1 < 2) 29 clang_analyzer_eval(a == 0 || a == UINT_MAX); // expected-warning{{TRUE}} 30 } 31 32 void smallAdjustmentLE (unsigned a) { 33 if (a+1 <= 2) 34 clang_analyzer_eval(a == 0 || a == 1 || a == UINT_MAX); // expected-warning{{TRUE}} 35 } 36 37 38 // Each of these adjusted ranges has an adjustment large enough to push the 39 // comparison value over an overflow boundary (Min for <, Max for >). 40 // This corresponds to one set of branches in RangeConstraintManager. 41 void largeAdjustmentGT (unsigned a) { 42 if (a-2 > UINT_MAX-1) 43 clang_analyzer_eval(a == 1); // expected-warning{{TRUE}} 44 else 45 clang_analyzer_eval(a != 1); // expected-warning{{TRUE}} 46 } 47 48 void largeAdjustmentGE (unsigned a) { 49 if (a-2 >= UINT_MAX-1) 50 clang_analyzer_eval(a == 1 || a == 0); // expected-warning{{TRUE}} 51 else 52 clang_analyzer_eval(a > 1); // expected-warning{{TRUE}} 53 } 54 55 void largeAdjustmentLT (unsigned a) { 56 if (a+2 < 1) 57 clang_analyzer_eval(a == UINT_MAX-1); // expected-warning{{TRUE}} 58 else 59 clang_analyzer_eval(a != UINT_MAX-1); // expected-warning{{TRUE}} 60 } 61 62 void largeAdjustmentLE (unsigned a) { 63 if (a+2 <= 1) 64 clang_analyzer_eval(a == UINT_MAX-1 || a == UINT_MAX); // expected-warning{{TRUE}} 65 else 66 clang_analyzer_eval(a < UINT_MAX-1); // expected-warning{{TRUE}} 67 } 68 69 70 // Test the nine cases in RangeConstraintManager's pinning logic. 71 // For out-of-range tautologies, it may be the negation that actually 72 // triggers the case in question. 73 void mixedComparisons1(signed char a) { 74 // Case 1: The range is entirely below the symbol's range. 75 int min = INT_MIN; 76 77 clang_analyzer_eval((a - 2) >= (min + 5LL)); // expected-warning{{TRUE}} 78 79 clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} 80 clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} 81 clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} 82 } 83 84 void mixedComparisons2(signed char a) { 85 // Case 2: Only the lower end of the range is outside. 86 clang_analyzer_eval((a - 5) < (-0x81LL)); // expected-warning{{UNKNOWN}} 87 88 if ((a - 5) < (-0x81LL)) { 89 clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} 90 clang_analyzer_eval(a == 0x7F); // expected-warning{{FALSE}} 91 clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} 92 } 93 } 94 95 void mixedComparisons3(signed char a) { 96 // Case 3: The entire symbol range is covered. 97 clang_analyzer_eval((a - 0x200) < -0x100LL); // expected-warning{{TRUE}} 98 99 clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} 100 clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} 101 clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} 102 } 103 104 void mixedComparisons4(signed char a) { 105 // Case 4: The range wraps around, but the lower wrap is out-of-range. 106 clang_analyzer_eval((a - 5) > 0LL); // expected-warning{{UNKNOWN}} 107 108 if ((a - 5) > 0LL) { 109 clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} 110 clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} 111 clang_analyzer_eval(a == -0x80); // expected-warning{{FALSE}} 112 } 113 } 114 115 void mixedComparisons5(signed char a) { 116 // Case 5: The range is inside and may or may not wrap. 117 clang_analyzer_eval((a + 5) == 0LL); // expected-warning{{UNKNOWN}} 118 119 if ((a + 5) == 0LL) { 120 clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} 121 clang_analyzer_eval(a == 0x7F); // expected-warning{{FALSE}} 122 clang_analyzer_eval(a == -0x80); // expected-warning{{FALSE}} 123 } else { 124 clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} 125 clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} 126 clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} 127 } 128 } 129 130 void mixedComparisons6(signed char a) { 131 // Case 6: Only the upper end of the range is outside. 132 clang_analyzer_eval((a + 5) > 0x81LL); // expected-warning{{UNKNOWN}} 133 134 if ((a + 5) > 0x81LL) { 135 clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} 136 clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} 137 clang_analyzer_eval(a == -0x80); // expected-warning{{FALSE}} 138 } 139 } 140 141 void mixedComparisons7(signed char a) { 142 // Case 7: The range wraps around but is entirely outside the symbol's range. 143 int min = INT_MIN; 144 145 clang_analyzer_eval((a + 2) >= (min + 5LL)); // expected-warning{{TRUE}} 146 147 clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} 148 clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} 149 clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} 150 } 151 152 void mixedComparisons8(signed char a) { 153 // Case 8: The range wraps, but the upper wrap is out of range. 154 clang_analyzer_eval((a + 5) < 0LL); // expected-warning{{UNKNOWN}} 155 156 if ((a + 5) < 0LL) { 157 clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} 158 clang_analyzer_eval(a == 0x7F); // expected-warning{{FALSE}} 159 clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} 160 } 161 } 162 163 void mixedComparisons9(signed char a) { 164 // Case 9: The range is entirely above the symbol's range. 165 int max = INT_MAX; 166 167 clang_analyzer_eval((a + 2) <= (max - 5LL)); // expected-warning{{TRUE}} 168 169 clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} 170 clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} 171 clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} 172 } 173
