1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
/*
* Copyright 2016 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#include <setjmp.h>
#include <stdio.h>
typedef struct {
jmp_buf* jmp;
} jmp_state;
void setjmp_func(jmp_state* s, int level) {
jmp_buf* prev_jmp = s->jmp;
jmp_buf c_jmp;
if (level == 2) {
printf("level is 2, perform longjmp!\n");
longjmp(*(s->jmp), 1);
}
if (setjmp(c_jmp) == 0) {
printf("setjmp normal execution path, level: %d\n", level);
s->jmp = &c_jmp;
setjmp_func(s, level + 1);
} else {
printf("setjmp exception execution path, level: %d\n", level);
if (prev_jmp) {
printf("prev_jmp is not empty, continue with longjmp!\n");
s->jmp = prev_jmp;
longjmp(*(s->jmp), 1);
}
}
printf("Exiting setjmp function, level: %d\n", level);
}
int main(int argc, char* argv[]) {
jmp_state s;
s.jmp = NULL;
setjmp_func(&s, 0);
return 0;
}
|
