Re: [Lightning] Re: failure with GNU lightning on Mac OS X 10.6.2

[Todd Rovito]

On Tue, Feb 23, 2010 at 2:35 AM, Paolo Bonzini <address@hidden> wrote:
>> Dang, I feel like you guys almost have it solved.
>
> Possibly.
>
> First solution:
>
>       codeBuffer = mmap (NULL, 4096, PROT_EXEC | PROT_READ | PROT_WRITE,
>                   MAP_PRIVATE | MAP_ANON, -1, 0);
>
> (Ludovic proposed "-1" as the last argument).
>
> Second solution: revert to statically allocated codeBuffer and add
>
>      mprotect (((long) codeBuffer) & ~4095, 8192,
>                PROT_READ | PROT_WRITE | PROT_EXEC);
>
> before invoking it.
Paolo,
   Your first solution appears to be working great now!  Thank you.
Here is the final code I have that is running on Mac OSX 10.6.2:
     #include <stdio.h>
     #include <sys/mman.h>
     #include "lightning.h"

     static jit_insn *codeBuffer;

     typedef int (*pifi)(int);    /* Pointer to Int Function of Int */

     int main()
     {
       codeBuffer = mmap (NULL, 4096, PROT_EXEC | PROT_READ | PROT_WRITE,
                    MAP_PRIVATE | MAP_ANON, -1, 0);

       pifi  incr = (pifi) (jit_set_ip(codeBuffer).iptr);
       int   in;

       jit_leaf(1);                     /*      leaf  1             */
       in = jit_arg_i();                /* in = arg_i               */
       jit_getarg_i(JIT_R0, in);        /*      getarg_i R0         */
       jit_addi_i(JIT_RET, JIT_R0, 1);  /*      addi_i   RET, R0, 1 */
       jit_ret();                       /*      ret                 */

       jit_flush_code(codeBuffer, jit_get_ip().ptr);

       /* call the generated code, passing 5 as an argument */
       printf("%d + 1 = %d\n", 5, incr(5));
       return 0;
     }