[LLVMdev] built-in longjmp and setjmp

[Jim Grosbach]

ARM/Darwin implements them. I'm not aware of any others.

That said, they are designed for internal use by the compiler for exception handling. Calling them directly like this is very much not recommended. Using the system library setjmp()/longjmp() functions is preferred.

-Jim

On Apr 12, 2011, at 1:56 PM, Akira Hatanaka wrote:

> Does the X86 backend (or any other backend) correctly implement support for __builtin_setjmp and __builtin_longjmp?
> I don't get the correct result when I compile and run the following code with clang.
> 
> # clang foo.c -O3; ./a.out
> 
> #include <stdio.h>
> void *buf[20];
> void __attribute__((noinline))
> foo (void)
> {
>   __builtin_longjmp (buf, 1);
> }
> 
> int
> main (int argc, char** argv)
> {
>   if (__builtin_setjmp (buf))
>     {
>       printf("return\n");
>       return 0;
>     }
> 
>   printf("call foo\n");
>     foo ();
> 
>   return 1;
> }
> 
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