misc-ps.c revision ac73ea8c12772fd0dcec71b83c193a2837de7f8b 
1// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -analyze -disable-free -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=deadcode -verify %s
2
3unsigned long strlen(const char *);
4
5int size_rdar9373039 = 1;
6int rdar9373039() {
7  int x;
8  int j = 0;
9
10  for (int i = 0 ; i < size_rdar9373039 ; ++i)
11    x = 1;
12
13  // strlen doesn't invalidate the value of 'size_rdar9373039'.
14  int extra = (2 + strlen ("Clang") + ((4 - ((unsigned int) (2 + strlen ("Clang")) % 4)) % 4)) + (2 + strlen ("1.0") + ((4 - ((unsigned int) (2 + strlen ("1.0")) % 4)) % 4));
15
16  for (int i = 0 ; i < size_rdar9373039 ; ++i)
17    j += x; // no-warning
18
19  return j;
20}
21
22int foo_rdar9373039(const char *);
23
24int rdar93730392() {
25  int x;
26  int j = 0;
27
28  for (int i = 0 ; i < size_rdar9373039 ; ++i)
29    x = 1;
30
31  int extra = (2 + foo_rdar9373039 ("Clang") + ((4 - ((unsigned int) (2 + foo_rdar9373039 ("Clang")) % 4)) % 4)) + (2 + foo_rdar9373039 ("1.0") + ((4 - ((unsigned int) (2 + foo_rdar9373039 ("1.0")) % 4)) % 4)); // expected-warning {{never read}}
32
33  for (int i = 0 ; i < size_rdar9373039 ; ++i)
34    j += x; // expected-warning {{garbage}}
35
36  return j;
37}
38
39
40int PR8962 (int *t) {
41  // This should look through the __extension__ no-op.
42  if (__extension__ (t)) return 0;
43  return *t; // expected-warning {{null pointer}}
44}
45
46int PR8962_b (int *t) {
47  // This should still ignore the nested casts
48  // which aren't handled by a single IgnoreParens()
49  if (((int)((int)t))) return 0;
50  return *t; // expected-warning {{null pointer}}
51}
52
53int PR8962_c (int *t) {
54  // If the last element in a StmtExpr was a ParenExpr, it's still live
55  if (({ (t ? (_Bool)0 : (_Bool)1); })) return 0;
56  return *t; // no-warning
57}
58
59int PR8962_d (int *t) {
60  // If the last element in a StmtExpr is an __extension__, it's still live
61  if (({ __extension__(t ? (_Bool)0 : (_Bool)1); })) return 0;
62  return *t; // no-warning
63}
64
65int PR8962_e (int *t) {
66  // Redundant casts can mess things up!
67  // Environment used to skip through NoOp casts, but LiveVariables didn't!
68  if (({ (t ? (int)(int)0L : (int)(int)1L); })) return 0;
69  return *t; // no-warning
70}
71
72int PR8962_f (int *t) {
73  // The StmtExpr isn't a block-level expression here,
74  // the __extension__ is. But the value should be attached to the StmtExpr
75  // anyway. Make sure the block-level check is /before/ IgnoreParens.
76  if ( __extension__({
77    _Bool r;
78    if (t) r = 0;
79    else r = 1;
80    r;
81  }) ) return 0;
82  return *t; // no-warning
83}
84