[prev in list] [next in list] [prev in thread] [next in thread]
List: php-internals
Subject: [PHP-DEV] custom handler for specific zend_ops
From: "Marco Cova" <marco.cova () gmail ! com>
Date: 2007-02-27 22:03:28
Message-ID: af20956c0702271403q62fd99ffke95ff475636da57a () mail ! gmail ! com
[Download RAW message or body]
Hi all.
[Please, let me know if there is a better place to ask such questions.]
In a Zend extension I'm working on, I need to perform some actions
when certain instructions (zend_ops) are executed by the VM. Note that
I'm interesting in specific instructions rather than instruction
types, e.g., the first echo zend_op of a function as opposed to all
echo instructions. Also, I want the handler to be invoked only when an
interesting statement is executed (in other words, determining whether
a zend_op is interesting must be done before execution).
The way I currently do that is as follows: I override the
zend_compile_file function to retrieve the zend_op_array of a file,
identify the interesting statements in the array, and override their
handler (the handler field in the zend_op struct) with my custom
handler:
The custom handler looks like this:
int custom_handler(ZEND_OPCODE_HANDLE_ARGS)
{
// do my stuff
....
return zend_vm_get_opcode_handler(execute_data->opline->opcode,
execute_data->opline)(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU);
}
where zend_get_opcode_handler is a copy-and-paste of the static
function in zend_vm_execute.h
While this seems to work (on the limited tests I've run) it also looks
too hackish to be the correct way to do this ;-) So, here's the
question: is there a better way to achieve the same result?
I've looked at the USER_OPCODE API, but it seems to me that the API
doesn't allow to specify a handler for specific zend_ops (but let me
know if I'm wrong!)
Thanks in advance,
Marco
--
PHP Internals - PHP Runtime Development Mailing List
To unsubscribe, visit: http://www.php.net/unsub.php
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic