38 lines
1.4 KiB
C
38 lines
1.4 KiB
C
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// RUN: %clang_analyze_cc1 -w -triple i386-apple-darwin10 -analyzer-checker=core,debug.ExprInspection -verify %s
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void clang_analyzer_eval(int);
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struct S {
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int x, y;
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int z[2];
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};
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void testOffsets(struct S *s, int coin) {
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if (s != 0)
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return;
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// FIXME: Here we are testing the hack that computes offsets to null pointers
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// as 0 in order to find null dereferences of not-exactly-null pointers,
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// such as &(s->y) below, which is equal to 4 rather than 0 in run-time.
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// These are indeed null.
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clang_analyzer_eval(s == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval(&(s->x) == 0); // expected-warning{{TRUE}}
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// FIXME: These should ideally be true.
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clang_analyzer_eval(&(s->y) == 4); // expected-warning{{FALSE}}
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clang_analyzer_eval(&(s->z[0]) == 8); // expected-warning{{FALSE}}
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clang_analyzer_eval(&(s->z[1]) == 12); // expected-warning{{FALSE}}
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// FIXME: These should ideally be false.
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clang_analyzer_eval(&(s->y) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval(&(s->z[0]) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval(&(s->z[1]) == 0); // expected-warning{{TRUE}}
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// But these should still be reported as null dereferences.
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if (coin)
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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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else
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s->z[1] = 6; // expected-warning{{Array access (via field 'z') results in a null pointer dereference}}
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}
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