stackaddrleak.c revision 651f13cea278ec967336033dd032faef0e9fc2ec 
1// RUN: %clang_cc1 -analyze -analyzer-checker=core -verify -std=c99 -Dbool=_Bool -Wno-bool-conversion %s
2// RUN: %clang_cc1 -analyze -analyzer-checker=core -verify -x c++ -Wno-bool-conversion %s
3
4typedef __INTPTR_TYPE__ intptr_t;
5char const *p;
6
7void f0() {
8  char const str[] = "This will change";
9  p = str;
10}  // expected-warning{{Address of stack memory associated with local variable 'str' is still referred to by the global variable 'p' upon returning to the caller.  This will be a dangling reference}}
11
12void f1() {
13  char const str[] = "This will change";
14  p = str;
15  p = 0; // no-warning
16}
17
18void f2() {
19  p = (const char *) __builtin_alloca(12);
20} // expected-warning{{Address of stack memory allocated by call to alloca() on line 19 is still referred to by the global variable 'p' upon returning to the caller.  This will be a dangling reference}}
21
22// PR 7383 - previosly the stack address checker would crash on this example
23//  because it would attempt to do a direct load from 'pr7383_list'.
24static int pr7383(__const char *__)
25{
26  return 0;
27}
28extern __const char *__const pr7383_list[];
29
30// Test that we catch multiple returns via globals when analyzing a function.
31void test_multi_return() {
32  static int *a, *b;
33  int x;
34  a = &x;
35  b = &x;
36} // expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the global variable 'a' upon returning}} expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the global variable 'b' upon returning}}
37
38intptr_t returnAsNonLoc() {
39  int x;
40  return (intptr_t)&x; // expected-warning{{Address of stack memory associated with local variable 'x' returned to caller}}
41}
42
43bool returnAsBool() {
44  int x;
45  return &x; // no-warning
46}
47
48void assignAsNonLoc() {
49  extern intptr_t ip;
50  int x;
51  ip = (intptr_t)&x;
52} // expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the global variable 'ip' upon returning}}
53
54void assignAsBool() {
55  extern bool b;
56  int x;
57  b = &x;
58} // no-warning
59