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Thread-Topic: [PHP-DEV] PHP FFI extenesion
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Date: Thu, 26 Apr 2018 22:29:48 +0000
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Subject: Re: [PHP-DEV] PHP FFI extenesion
From: dmitry@zend.com (Dmitry Stogov)

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Hi Michael,


I've, also, tried to implement FFI definition pre-loading (currently just H=
 files).

I spent just two hours and implementation misses a lot of details, but it l=
ooks like this may work with FFI extension almost out of the box.


https://github.com/dstogov/php-ffi/commit/75cdae7a26406ae75ee27317ddb198177=
4a81006


Thanks. Dmitry.

________________________________
From: Michael Wallner <mike.php.net@gmail.com> on behalf of Michael Wallner=
 <mike@php.net>
Sent: Thursday, April 26, 2018 10:30:38 PM
To: Dmitry Stogov
Cc: Stanislav Malyshev; Zeev Suraski; Xinchen Hui; Nikita Popov; Bob Weinan=
d; Anatol Belski (ab@php.net); PHP internals list
Subject: Re: [PHP-DEV] PHP FFI extenesion

Hey!

> On 26 04 2018, at 20:47, Dmitry Stogov <dmitry@zend.com> wrote:
>
> Hi Michael,
>
>
> I've just tried to run PSI with php-master (32-bit DEBUG build) and got S=
IGSEGV on the simplest test.
>
> Use "psi.d/string.psi" and attemt to call psi\strerror(10)
>
>
> #0  0xf44916ba in psi_call_frame_parse_args (frame=3D0xf426c500, execute_=
data=3D0x0) at /home/dmitry/php/ext-psi/src/call.c:273
> #1  0xf4494fe7 in psi_context_call (C=3D0x92dfe90, execute_data=3D0x0, re=
turn_value=3D0x8fc0144 <HARDCODED_INI+4>, impl=3D0x9341658)
>    at /home/dmitry/php/ext-psi/src/context.c:250
> #2  0xf4499b44 in psi_ffi_handler (sig=3D0x92e0fa0, result=3D0xffff9760, =
args=3D0xffff96f0, data=3D0x9341658)
>    at /home/dmitry/php/ext-psi/src/libffi.c:387
> #3  0xf4467a76 in ffi_closure_SYSV_inner () from /lib/libffi.so.6
> #4  0xf4467eb6 in ffi_closure_SYSV () from /lib/libffi.so.6
> #5  0x08701d21 in ZEND_DO_FCALL_BY_NAME_SPEC_RETVAL_USED_HANDLER () at /h=
ome/dmitry/php/php-master/Zend/zend_vm_execute.h:890
> #6  0x0875fd12 in execute_ex (ex=3D0xf421d020) at /home/dmitry/php/php-ma=
ster/Zend/zend_vm_execute.h:54819
> #7  0x087643b1 in zend_execute (op_array=3D0xf426c460, return_value=3D0x0=
) at /home/dmitry/php/php-master/Zend/zend_vm_execute.h:59987
> #8  0x086b0d2f in zend_execute_scripts (type=3D8, retval=3D0x0, file_coun=
t=3D3) at /home/dmitry/php/php-master/Zend/zend.c:1566
> #9  0x0863cdde in php_execute_script (primary_file=3D0xffffcbbc) at /home=
/dmitry/php/php-master/main/main.c:2467
> #10 0x0876676a in do_cli (argc=3D2, argv=3D0x90e4850) at /home/dmitry/php=
/php-master/sapi/cli/php_cli.c:1011
> #11 0x087673b2 in main (argc=3D2, argv=3D0x90e4850) at /home/dmitry/php/p=
hp-master/sapi/cli/php_cli.c:1404
>
> execute_data is NULL
>
>
> Did you test ext-psi with php-master?
>

I only test on master, but never tested 32bit :-/
https://travis-ci.org/m6w6/ext-psi/jobs/368760446#L2102

>
> As I understood, you create libffi callback/closure for each function dec=
lared in *.psi file(s).
>
> And then use it to call a general psi_ffi_handler().
>
> Why not to call a general function handler in first place (without any ff=
i magic)?
>

Let me think about that. It=92s my first with libffi/libjit, so maybe I was=
 thinking too complicated and took more corners than I had to=85

Thanks,
Mike


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