| 1 | // RUN: %clang_analyze_cc1 -w -triple i386-apple-darwin10 -analyzer-checker=core,debug.ExprInspection -verify %s |
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| 2 | |
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| 3 | void clang_analyzer_eval(int); |
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| 4 | |
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| 5 | struct S { |
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| 6 | int x, y; |
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| 7 | int z[2]; |
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| 8 | }; |
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| 9 | |
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| 10 | void testOffsets(struct S *s, int coin) { |
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| 11 | if (s != 0) |
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| 12 | return; |
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| 13 | |
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| 14 | // FIXME: Here we are testing the hack that computes offsets to null pointers |
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| 15 | // as 0 in order to find null dereferences of not-exactly-null pointers, |
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| 16 | // such as &(s->y) below, which is equal to 4 rather than 0 in run-time. |
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| 17 | |
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| 18 | // These are indeed null. |
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| 19 | clang_analyzer_eval(s == 0); // expected-warning{{TRUE}} |
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| 20 | clang_analyzer_eval(&(s->x) == 0); // expected-warning{{TRUE}} |
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| 21 | |
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| 22 | // FIXME: These should ideally be true. |
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| 23 | clang_analyzer_eval(&(s->y) == 4); // expected-warning{{FALSE}} |
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| 24 | clang_analyzer_eval(&(s->z[0]) == 8); // expected-warning{{FALSE}} |
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| 25 | clang_analyzer_eval(&(s->z[1]) == 12); // expected-warning{{FALSE}} |
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| 26 | |
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| 27 | // FIXME: These should ideally be false. |
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| 28 | clang_analyzer_eval(&(s->y) == 0); // expected-warning{{TRUE}} |
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| 29 | clang_analyzer_eval(&(s->z[0]) == 0); // expected-warning{{TRUE}} |
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| 30 | clang_analyzer_eval(&(s->z[1]) == 0); // expected-warning{{TRUE}} |
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| 31 | |
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| 32 | // But these should still be reported as null dereferences. |
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| 33 | if (coin) |
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| 34 | s->y = 5; // expected-warning{{Access to field 'y' results in a dereference of a null pointer (loaded from variable 's')}} |
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| 35 | else |
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| 36 | s->z[1] = 6; // expected-warning{{Array access (via field 'z') results in a null pointer dereference}} |
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| 37 | } |
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| 38 | |
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