| // RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -verify -analyzer-constraints=range %s |
| |
| void clang_analyzer_eval(int); |
| |
| #define UINT_MAX (~0U) |
| #define INT_MAX (UINT_MAX & (UINT_MAX >> 1)) |
| #define INT_MIN (-INT_MAX - 1) |
| |
| |
| // Each of these adjusted ranges has an adjustment small enough to split the |
| // solution range across an overflow boundary (Min for <, Max for >). |
| // This corresponds to one set of branches in RangeConstraintManager. |
| void smallAdjustmentGT (unsigned a) { |
| if (a+2 > 1) |
| clang_analyzer_eval(a < UINT_MAX-1); // expected-warning{{TRUE}} |
| else |
| clang_analyzer_eval(a == UINT_MAX-1 || a == UINT_MAX); // expected-warning{{TRUE}} |
| } |
| |
| void smallAdjustmentGE (unsigned a) { |
| if (a+2 >= 1) |
| clang_analyzer_eval(a < UINT_MAX-1 || a == UINT_MAX); // expected-warning{{TRUE}} |
| else |
| clang_analyzer_eval(a == UINT_MAX-1); // expected-warning{{TRUE}} |
| } |
| |
| void smallAdjustmentLT (unsigned a) { |
| if (a+1 < 2) |
| clang_analyzer_eval(a == 0 || a == UINT_MAX); // expected-warning{{TRUE}} |
| } |
| |
| void smallAdjustmentLE (unsigned a) { |
| if (a+1 <= 2) |
| clang_analyzer_eval(a == 0 || a == 1 || a == UINT_MAX); // expected-warning{{TRUE}} |
| } |
| |
| |
| // Each of these adjusted ranges has an adjustment large enough to push the |
| // comparison value over an overflow boundary (Min for <, Max for >). |
| // This corresponds to one set of branches in RangeConstraintManager. |
| void largeAdjustmentGT (unsigned a) { |
| if (a-2 > UINT_MAX-1) |
| clang_analyzer_eval(a == 1); // expected-warning{{TRUE}} |
| else |
| clang_analyzer_eval(a != 1); // expected-warning{{TRUE}} |
| } |
| |
| void largeAdjustmentGE (unsigned a) { |
| if (a-2 >= UINT_MAX-1) |
| clang_analyzer_eval(a == 1 || a == 0); // expected-warning{{TRUE}} |
| else |
| clang_analyzer_eval(a > 1); // expected-warning{{TRUE}} |
| } |
| |
| void largeAdjustmentLT (unsigned a) { |
| if (a+2 < 1) |
| clang_analyzer_eval(a == UINT_MAX-1); // expected-warning{{TRUE}} |
| else |
| clang_analyzer_eval(a != UINT_MAX-1); // expected-warning{{TRUE}} |
| } |
| |
| void largeAdjustmentLE (unsigned a) { |
| if (a+2 <= 1) |
| clang_analyzer_eval(a == UINT_MAX-1 || a == UINT_MAX); // expected-warning{{TRUE}} |
| else |
| clang_analyzer_eval(a < UINT_MAX-1); // expected-warning{{TRUE}} |
| } |
| |
| |
| // Test the nine cases in RangeConstraintManager's pinning logic. |
| // For out-of-range tautologies, it may be the negation that actually |
| // triggers the case in question. |
| void mixedComparisons1(signed char a) { |
| // Case 1: The range is entirely below the symbol's range. |
| int min = INT_MIN; |
| |
| clang_analyzer_eval((a - 2) >= (min + 5LL)); // expected-warning{{TRUE}} |
| |
| clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} |
| } |
| |
| void mixedComparisons2(signed char a) { |
| // Case 2: Only the lower end of the range is outside. |
| clang_analyzer_eval((a - 5) < (-0x81LL)); // expected-warning{{UNKNOWN}} |
| |
| if ((a - 5) < (-0x81LL)) { |
| clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{FALSE}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} |
| } |
| } |
| |
| void mixedComparisons3(signed char a) { |
| // Case 3: The entire symbol range is covered. |
| clang_analyzer_eval((a - 0x200) < -0x100LL); // expected-warning{{TRUE}} |
| |
| clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} |
| } |
| |
| void mixedComparisons4(signed char a) { |
| // Case 4: The range wraps around, but the lower wrap is out-of-range. |
| clang_analyzer_eval((a - 5) > 0LL); // expected-warning{{UNKNOWN}} |
| |
| if ((a - 5) > 0LL) { |
| clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{FALSE}} |
| } |
| } |
| |
| void mixedComparisons5(signed char a) { |
| // Case 5: The range is inside and may or may not wrap. |
| clang_analyzer_eval((a + 5) == 0LL); // expected-warning{{UNKNOWN}} |
| |
| if ((a + 5) == 0LL) { |
| clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{FALSE}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{FALSE}} |
| } else { |
| clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} |
| } |
| } |
| |
| void mixedComparisons6(signed char a) { |
| // Case 6: Only the upper end of the range is outside. |
| clang_analyzer_eval((a + 5) > 0x81LL); // expected-warning{{UNKNOWN}} |
| |
| if ((a + 5) > 0x81LL) { |
| clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{FALSE}} |
| } |
| } |
| |
| void mixedComparisons7(signed char a) { |
| // Case 7: The range wraps around but is entirely outside the symbol's range. |
| int min = INT_MIN; |
| |
| clang_analyzer_eval((a + 2) >= (min + 5LL)); // expected-warning{{TRUE}} |
| |
| clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} |
| } |
| |
| void mixedComparisons8(signed char a) { |
| // Case 8: The range wraps, but the upper wrap is out of range. |
| clang_analyzer_eval((a + 5) < 0LL); // expected-warning{{UNKNOWN}} |
| |
| if ((a + 5) < 0LL) { |
| clang_analyzer_eval(a == 0); // expected-warning{{FALSE}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{FALSE}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} |
| } |
| } |
| |
| void mixedComparisons9(signed char a) { |
| // Case 9: The range is entirely above the symbol's range. |
| int max = INT_MAX; |
| |
| clang_analyzer_eval((a + 2) <= (max - 5LL)); // expected-warning{{TRUE}} |
| |
| clang_analyzer_eval(a == 0); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == 0x7F); // expected-warning{{UNKNOWN}} |
| clang_analyzer_eval(a == -0x80); // expected-warning{{UNKNOWN}} |
| } |