38 lines · c
1// RUN: %clang_analyze_cc1 -w -triple i386-apple-darwin10 -analyzer-checker=core,debug.ExprInspection -verify %s2 3void clang_analyzer_eval(int);4 5struct S {6 int x, y;7 int z[2];8};9 10void testOffsets(struct S *s, int coin) {11 if (s != 0)12 return;13 14 // FIXME: Here we are testing the hack that computes offsets to null pointers15 // as 0 in order to find null dereferences of not-exactly-null pointers,16 // such as &(s->y) below, which is equal to 4 rather than 0 in run-time.17 18 // These are indeed null.19 clang_analyzer_eval(s == 0); // expected-warning{{TRUE}}20 clang_analyzer_eval(&(s->x) == 0); // expected-warning{{TRUE}}21 22 // FIXME: These should ideally be true.23 clang_analyzer_eval(&(s->y) == 4); // expected-warning{{FALSE}}24 clang_analyzer_eval(&(s->z[0]) == 8); // expected-warning{{FALSE}}25 clang_analyzer_eval(&(s->z[1]) == 12); // expected-warning{{FALSE}}26 27 // FIXME: These should ideally be false.28 clang_analyzer_eval(&(s->y) == 0); // expected-warning{{TRUE}}29 clang_analyzer_eval(&(s->z[0]) == 0); // expected-warning{{TRUE}}30 clang_analyzer_eval(&(s->z[1]) == 0); // expected-warning{{TRUE}}31 32 // But these should still be reported as null dereferences.33 if (coin)34 s->y = 5; // expected-warning{{Access to field 'y' results in a dereference of a null pointer (loaded from variable 's')}}35 else36 s->z[1] = 6; // expected-warning{{Array access (via field 'z') results in a null pointer dereference}}37}38