uninit-vals-ps-region.m revision 8133716fc5cf705308c36aa6b0e7e4be2ac2ccdc 
1// RUN: %clang_cc1 -analyze -analyzer-check-objc-mem -analyzer-store=region -verify %s
2
3struct s {
4  int data;
5};
6
7struct s global;
8
9void g(int);
10
11void f4() {
12  int a;
13  if (global.data == 0)
14    a = 3;
15  if (global.data == 0) // When the true branch is feasible 'a = 3'.
16    g(a); // no-warning
17}
18
19
20// Test uninitialized value due to part of the structure being uninitialized.
21struct TestUninit { int x; int y; };
22struct TestUninit test_uninit_aux();
23void test_unit_aux2(int);
24void test_uninit_pos() {
25  struct TestUninit v1 = { 0, 0 };
26  struct TestUninit v2 = test_uninit_aux();
27  int z;
28  v1.y = z; // expected-warning{{Assigned value is garbage or undefined}}
29  test_unit_aux2(v2.x + v1.y);
30}
31void test_uninit_pos_2() {
32  struct TestUninit v1 = { 0, 0 };
33  struct TestUninit v2;
34  test_unit_aux2(v2.x + v1.y);  // expected-warning{{The left operand of '+' is a garbage value}}
35}
36void test_uninit_pos_3() {
37  struct TestUninit v1 = { 0, 0 };
38  struct TestUninit v2;
39  test_unit_aux2(v1.y + v2.x);  // expected-warning{{The right operand of '+' is a garbage value}}
40}
41
42void test_uninit_neg() {
43  struct TestUninit v1 = { 0, 0 };
44  struct TestUninit v2 = test_uninit_aux();
45  test_unit_aux2(v2.x + v1.y); // no-warning
46}
47
48extern void test_uninit_struct_arg_aux(struct TestUninit arg);
49void test_uninit_struct_arg() {
50  struct TestUninit x;
51  test_uninit_struct_arg_aux(x); // expected-warning{{Passed-by-value struct argument contains uninitialized data (e.g., field: 'x')}}
52}
53
54@interface Foo
55- (void) passVal:(struct TestUninit)arg;
56@end
57void testFoo(Foo *o) {
58  struct TestUninit x;
59  [o passVal:x]; // expected-warning{{Passed-by-value struct argument contains uninitialized data (e.g., field: 'x')}}
60}
61
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63