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November 27, 2003
Compiling without -g
Finally got time to look at the problem with embeding the PHP interpreter in
D.


Again, the program runs just fine when compiled with -g but raises an
AccessViolation error on the php_embed_init() call. Here's the source code.

const int SUCCESS = 0;

extern (C)
{
   int php_embed_init(int argc, char** argv , void**** ptsrm_ls);
   void php_embed_shutdown(void*** tsrm_ls);

   export char* get_zend_version();
}


int main()
{
   static char *argv[2] = ["test1", null];
   static void*** tsrm_ls = null;

   if (SUCCESS != php_embed_init(1, argv, &tsrm_ls))
   {
       printf("Failed initializing php_embed sapi\n");
       return -1;
   }

   printf("Zend version: %s\n", get_zend_version());

   php_embed_shutdown(tsrm_ls);
   return 0;
}

Following the advice from Walter, I've disassembled the files but given my
poor skills in ASM I've lost track just from the start so I ask for help
now.

The main function got translated to:

Comdat: __Dmain SEGMENT NONE '_TEXT' 00000052 bytes
0000    55                        push      ebp
0001    8B EC                     mov       ebp,esp
0003    68 04 00 00 00            push      offset L$8
0008    68 08 00 00 00            push      offset L$2
000D    6A 01                     push      0x00000001
000F    E8 00 00 00 00            call      _php_embed_init
0014    83 C4 0C                  add       esp,0x0000000c
0017    85 C0                     test      eax,eax
0019    74 14                     je        L$9
001B    68 10 00 00 00            push      offset L$3
0020    E8 00 00 00 00            call      _printf
0025    B8 FF FF FF FF            mov       eax,0xffffffff
002A    83 C4 04                  add       esp,0x00000004
002D    5D                        pop       ebp
002E    C3                        ret


That's the debug version. The optimized one doesn't have the following lines

0000    55                        push      ebp
0001    8B EC                     mov       ebp,esp
(...)
002D    5D                        pop       ebp

So that must be the reason. Only that I don't know why, saving ebp on the
stack prevents an access violation from raising.

Mmmm... Help!


--
Julio César Carrascal Urquijo
http://www.artelogico.com/
November 28, 2003
Re: Compiling without -g
Are you using linux?

"Julio César Carrascal Urquijo" <adnoctum@phreaker.net> wrote in message
news:bq3sm3$2992$1@digitaldaemon.com...
> Finally got time to look at the problem with embeding the PHP interpreter
in
> D.
>
>
> Again, the program runs just fine when compiled with -g but raises an
> AccessViolation error on the php_embed_init() call. Here's the source
code.
>
> const int SUCCESS = 0;
>
> extern (C)
> {
>     int php_embed_init(int argc, char** argv , void**** ptsrm_ls);
>     void php_embed_shutdown(void*** tsrm_ls);
>
>     export char* get_zend_version();
> }
>
>
> int main()
> {
>     static char *argv[2] = ["test1", null];
>     static void*** tsrm_ls = null;
>
>     if (SUCCESS != php_embed_init(1, argv, &tsrm_ls))
>     {
>         printf("Failed initializing php_embed sapi\n");
>         return -1;
>     }
>
>     printf("Zend version: %s\n", get_zend_version());
>
>     php_embed_shutdown(tsrm_ls);
>     return 0;
> }
>
> Following the advice from Walter, I've disassembled the files but given my
> poor skills in ASM I've lost track just from the start so I ask for help
> now.
>
> The main function got translated to:
>
> Comdat: __Dmain SEGMENT NONE '_TEXT' 00000052 bytes
> 0000    55                        push      ebp
> 0001    8B EC                     mov       ebp,esp
> 0003    68 04 00 00 00            push      offset L$8
> 0008    68 08 00 00 00            push      offset L$2
> 000D    6A 01                     push      0x00000001
> 000F    E8 00 00 00 00            call      _php_embed_init
> 0014    83 C4 0C                  add       esp,0x0000000c
> 0017    85 C0                     test      eax,eax
> 0019    74 14                     je        L$9
> 001B    68 10 00 00 00            push      offset L$3
> 0020    E8 00 00 00 00            call      _printf
> 0025    B8 FF FF FF FF            mov       eax,0xffffffff
> 002A    83 C4 04                  add       esp,0x00000004
> 002D    5D                        pop       ebp
> 002E    C3                        ret
>
>
> That's the debug version. The optimized one doesn't have the following
lines
>
> 0000    55                        push      ebp
> 0001    8B EC                     mov       ebp,esp
> (...)
> 002D    5D                        pop       ebp
>
> So that must be the reason. Only that I don't know why, saving ebp on the
> stack prevents an access violation from raising.
>
> Mmmm... Help!
>
>
> --
> Julio César Carrascal Urquijo
> http://www.artelogico.com/
>
>
November 29, 2003
Re: Compiling without -g
Tested on win98se and Win2k dmd 0.75 php-4.3.3 libs.

If you want to compile the example I'll send you the OMF libs. Didn't posted
to the ng because their +600k.


"Walter" <walter@digitalmars.com> wrote in message
news:bq897i$2s6v$2@digitaldaemon.com...
> Are you using linux?
>

--
Julio César Carrascal Urquijo
http://www.artelogico.com/
December 29, 2003
Re: Compiling without -g
"Julio César Carrascal Urquijo" <adnoctum@phreaker.net> wrote in message
news:bq8vrj$qog$1@digitaldaemon.com...
> Tested on win98se and Win2k dmd 0.75 php-4.3.3 libs.
>
> If you want to compile the example I'll send you the OMF libs. Didn't
posted
> to the ng because their +600k.

It's just not practical for me to debug 600k of code I'm not familiar with.
I really need small, reproducible examples of problems.
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