uninit-vals-ps-region.m revision cdc3a89d5de90b2299c56f4a46c3de590c5184d1 
1// RUN: %clang_cc1 -analyze -analyzer-store=region -analyzer-checker=core,alpha.deadcode.IdempotentOperations -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); // expected-warning{{The right operand to '+' is always 0}}
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
62// Test case from <rdar://problem/7780304>.  That shows an uninitialized value
63// being used in the LHS of a compound assignment.
64void rdar_7780304() {
65  typedef struct s_r7780304 { int x; } s_r7780304;
66  s_r7780304 b;
67  b.x |= 1; // expected-warning{{The left expression of the compound assignment is an uninitialized value. The computed value will also be garbage}}
68}
69
70
71// The flip side of PR10163 -- float arrays that are actually uninitialized
72// (The main test is in uninit-vals.m)
73void test_PR10163(float);
74void PR10163 (void) {
75  float x[2];
76  test_PR10163(x[1]); // expected-warning{{uninitialized value}}
77}
78
79