1 /* { dg-additional-options "-fdiagnostics-show-line-numbers -fdiagnostics-path-format=inline-events -fdiagnostics-show-caret" } */
2 /* { dg-enable-nn-line-numbers "" } */
3
4 #include <stdlib.h>
5
6 extern int some_condition ();
7 extern void do_stuff (int);
8
9 void
10 may_call_free (void *victim)
11 {
12 if (some_condition ())
13 return;
14
15 free (victim); /* { dg-warning "double-'free' of 'victim'" } */
16 }
17
18 void test (void *ptr)
19 {
20 do_stuff (1);
21
22 may_call_free (ptr);
23
24 do_stuff (2);
25
26 may_call_free (ptr);
27
28 do_stuff (3);
29 }
30
31 /* { dg-begin-multiline-output "" }
32 NN | free (victim);
33 | ^~~~~~~~~~~~~
34 'test': events 1-2
35 |
36 | NN | void test (void *ptr)
37 | | ^~~~
38 | | |
39 | | (1) entry to 'test'
40 |......
41 | NN | may_call_free (ptr);
42 | | ~~~~~~~~~~~~~~~~~~~
43 | | |
44 | | (2) calling 'may_call_free' from 'test'
45 |
46 +--> 'may_call_free': events 3-6
47 |
48 | NN | may_call_free (void *victim)
49 | | ^~~~~~~~~~~~~
50 | | |
51 | | (3) entry to 'may_call_free'
52 | NN | {
53 | NN | if (some_condition ())
54 | | ~
55 | | |
56 | | (4) following 'false' branch...
57 |......
58 | NN | free (victim);
59 | | ~~~~~~~~~~~~~
60 | | |
61 | | (5) ...to here
62 | | (6) first 'free' here
63 |
64 <------+
65 |
66 'test': events 7-8
67 |
68 | NN | may_call_free (ptr);
69 | | ^~~~~~~~~~~~~~~~~~~
70 | | |
71 | | (7) returning to 'test' from 'may_call_free'
72 |......
73 | NN | may_call_free (ptr);
74 | | ~~~~~~~~~~~~~~~~~~~
75 | | |
76 | | (8) passing freed pointer 'ptr' in call to 'may_call_free' from 'test'
77 |
78 +--> 'may_call_free': events 9-12
79 |
80 | NN | may_call_free (void *victim)
81 | | ^~~~~~~~~~~~~
82 | | |
83 | | (9) entry to 'may_call_free'
84 | NN | {
85 | NN | if (some_condition ())
86 | | ~
87 | | |
88 | | (10) following 'false' branch...
89 |......
90 | NN | free (victim);
91 | | ~~~~~~~~~~~~~
92 | | |
93 | | (11) ...to here
94 | | (12) second 'free' here; first 'free' was at (6)
95 |
96 { dg-end-multiline-output "" } */