Created
December 8, 2012 23:27
-
-
Save xxuejie/4242509 to your computer and use it in GitHub Desktop.
setjmp testcase compiled with -O2 option
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
$ clang -O2 setjmp-twice.c | |
$ ./a.out | |
Normal execution path of first function! | |
Exception execution path of first function! | |
Exception execution path of first function! | |
Calling longjmp the second time! |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
$ emcc -O2 setjmp-twice.c | |
$ node ./a.out.js | |
ormal execution path of first function! | |
Exception execution path of first function! | |
Exception execution path of first function! | |
Calling longjmp the second time! |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <setjmp.h> | |
#include <stdio.h> | |
typedef struct { | |
jmp_buf* jmp; | |
} jmp_state; | |
void second_func(jmp_state* s); | |
void first_func(jmp_state* s) { | |
jmp_buf* prev_jmp = s->jmp; | |
jmp_buf c_jmp; | |
volatile int once = 0; | |
if (setjmp(c_jmp) == 0) { | |
printf("Normal execution path of first function!\n"); | |
s->jmp = &c_jmp; | |
second_func(s); | |
} else { | |
printf("Exception execution path of first function!\n"); | |
if (!once) { | |
once = 1; | |
longjmp(*(s->jmp), 1); | |
} else { | |
printf("Calling longjmp the second time!\n"); | |
} | |
} | |
} | |
void second_func(jmp_state* s) { | |
longjmp(*(s->jmp), 1); | |
} | |
int main(int argc, char *argv[]) { | |
jmp_state s; | |
s.jmp = NULL; | |
first_func(&s); | |
return 0; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment