[PHP-DEV] questions about php structures
Hello, Got a few questions if anybody can help me out: 1) what's the difference between zend_object and zend_object_value? what is each for? Because i'm confused.. 2) What are zend_object_store_bucket; and zend_object_store used for? Thanks, A.
[PHP-DEV] error handler
Hello, Can anybody show me, where in the core the user error handler is called? The mechanism of how it's called... Thanks, A.
[PHP-DEV] compile php as fpm
Hello, I'm trying to compile php 5.3 as php-fpm using the following configure command ./configure --enable-debug --enable-maintainer-zts --enable-fpm --enable-fastcgi and i get this Thank you for using PHP. Notice: Following unknown configure options were used: --enable-fastcgi The command is from a tutorial on web. Thanks.
Re: [PHP-DEV] concatenation operator
By initialization i mean the latest point possible where I can set a breakpoint, but right before my scripts starts executing it's emalloc's or efree's. but even then you will see many things you're probably not interested in such as?.. Only thing that helps is learning the code structure and digging through it. Any hint/documentation to learn that? Thanks. From: Johannes Schlüter johan...@schlueters.de To: Adi Mutu adi_mut...@yahoo.com Cc: Felipe Pena felipe...@gmail.com; PHP Developers Mailing List internals@lists.php.net Sent: Saturday, June 30, 2012 12:36 AM Subject: Re: [PHP-DEV] concatenation operator On Fri, 2012-06-29 at 11:47 -0700, Adi Mutu wrote: Sorry for the late reply, I was away for a while.. I don't think I have dtrace because I'm on fedora.but i'll research. As said: Currently only on Solaris, MacOS and BSD. Oracle is porting DTrace to Oracle Linux. RedHat created SystemTap which is similar, ut I have never used it. If i would want to set a breakpoint after php's initialization process, but right before the scripts execution, so that after that I can set breakpoints to emalloc and efree which are executed only during my scripts execution where should i set it? Hope the question was clear enough. Depends on your view what initialization is. But execute() might be a place which helps ... but even then you will see many things you're probably not interested in. Only thing that helps is learning the code structure and digging through it. dtrace related: Why have you used 'execute:return' and not concat_function:return? What's with the execute function? That was a bug since I quickly edited an older script. In this case it doesn't change the result. johannes
Re: [PHP-DEV] concatenation operator
Hello,
Sorry for the late reply, I was away for a while..
I don't think I have dtrace because I'm on fedora.but i'll research.
If i would want to set a breakpoint after php's initialization process, but
right before the scripts execution, so that after that I can set breakpoints to
emalloc and efree which are executed only during my scripts execution where
should i set it? Hope the question was clear enough.
dtrace related:
Why have you used 'execute:return' and not concat_function:return? What's with
the execute function?
Thanks,
A.
From: Johannes Schlüter johan...@schlueters.de
To: Adi Mutu adi_mut...@yahoo.com
Cc: Felipe Pena felipe...@gmail.com; PHP Developers Mailing List
internals@lists.php.net
Sent: Thursday, June 7, 2012 11:18 PM
Subject: Re: [PHP-DEV] concatenation operator
On Thu, 2012-06-07 at 12:53 -0700, Adi Mutu wrote:
Ok Johannes, thanks for the answer. I'll try to look deeper.
I basically just wanted to know what happens when you concatenate two
strings? what emalloc/efree happens.
This depends. As always. As said what has to be done is one allocation
for the result value ... and then the zval magic, which depends on
refcount, references, ...
Also can you tell me if possible how to put a breakpoint to
emalloc/efree which are executed only after all core functions are
registered? because it takes like a million years like this and a
million F8 presses...
Depends on your debugger. Most allow conditional breakpoints or have a
breakpoint and while holding at some place add a few more ...
For such a question my preference is using DTrace (on Solaris, Mac or
BSD), something like this session:
$ cat test.d
#!/sbin/dtrace
pid$target::concat_function:entry {
self-in_concat = 1;
}
pid$target::execute:return {
self-in_concat = 0;
}
pid$target::_emalloc:entry
/ self-in_concat /
{
trace(arg0);
ustack();
}
pid$target::_erealloc:entry
/ self-in_concat /
{
trace(arg0);
trace(arg1);
ustack();
}
$ cat test1.php
?php
$a = foo; $b = bar; $a.$b;
$ dtrace -s test.d -c 'php test1.php'
dtrace: script 'test.d' matched 4 probes
dtrace: pid 16406 has exited
CPU ID FUNCTION:NAME
3 100372 _emalloc:entry 7
php`_emalloc
php`concat_function+0x270
php`ZEND_CONCAT_SPEC_CV_CV_HANDLER+0xcd
php`execute+0x3d9
php`dtrace_execute+0xe7
php`zend_execute_scripts+0xf5
php`php_execute_script+0x2e8
php`do_cli+0x864
php`main+0x6e2
php`_start+0x83
$ cat test2.php
?php
$a = 23; $b = bar; $a.$b;
$ dtrace -s test.d -c 'php test2.php'
dtrace: script 'test.d' matched 4 probes
dtrace: pid 16425 has exited
CPU ID FUNCTION:NAME
1 100373 _erealloc:entry 0
79
php`_erealloc
php`xbuf_format_converter+0x11ee
php`vspprintf+0x34
php`zend_spprintf+0x2f
php`_convert_to_string+0x174
php`zend_make_printable_zval+0x5ec
php`concat_function+0x3c
php`ZEND_CONCAT_SPEC_CV_CV_HANDLER+0xcd
php`execute+0x3d9
php`dtrace_execute+0xe7
php`zend_execute_scripts+0xf5
php`php_execute_script+0x2e8
php`do_cli+0x864
php`main+0x6e2
php`_start+0x83
1 100372 _emalloc:entry 6
php`_emalloc
php`concat_function+0x270
php`ZEND_CONCAT_SPEC_CV_CV_HANDLER+0xcd
php`execute+0x3d9
php`dtrace_execute+0xe7
php`zend_execute_scripts+0xf5
php`php_execute_script+0x2e8
php`do_cli+0x864
php`main+0x6e2
php`_start+0x83
So, when having two constant strings there's a single malloc, in this
case allocating 7 bytes (strlen(foo)+strlen(bar)+1), if you have a
different type it has to be converted first ...
johannes
Re: [PHP-DEV] Internals books (c) 2007+ ?
:) That's too badI've read Sara's book, but i'd also buy a new book on this topic. From: Lars Strojny l...@strojny.net To: Sanford Whiteman swhitemanlistens-softw...@cypressintegrated.com Cc: internals@lists.php.net Sent: Thursday, May 17, 2012 5:14 PM Subject: Re: [PHP-DEV] Internals books (c) 2007+ ? Yep, that might be exactly the problem. The audience for such a book might be less than 100. Am 17.05.2012 um 06:24 schrieb Sanford Whiteman: Sara’s book is still the best we have, nevertheless it shows its age. In Theo Schlossnagles Scalable Internet Architectures also has a chapter on PHP internals. The rest is more or less reading existing code and playing around. Looks like somebody on Internals should land a book deal :) Thanks, Lars. I first learned about zvals from a chapter in George Schlossnagle's Advanced PHP Programming, so it seems like there are deeper dives here and there. I don't know about the book deal if I'm the only to ask about it in so long, though. :) -- S. -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DEV] concatenation operator
that's nice, but i haven't understood a thing...i know something about php core and php extensions, but nothing about the Zend engine specific. Can you point me to some resources on this topic? Thanks, From: Felipe Pena felipe...@gmail.com To: Adi Mutu adi_mut...@yahoo.com Cc: PHP Developers Mailing List internals@lists.php.net Sent: Tuesday, June 5, 2012 11:17 PM Subject: Re: [PHP-DEV] concatenation operator Hi, 2012/6/5 Adi Mutu adi_mut...@yahoo.com: Hello, Can somebody point me to where the concatenation operator is implemented ? . operator. Thanks, See http://lxr.php.net/xref/PHP_TRUNK/Zend/zend_vm_def.h#133 -- Regards, Felipe Pena -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DEV] concatenation operator
Ok Johannes, thanks for the answer. I'll try to look deeper. I basically just wanted to know what happens when you concatenate two strings? what emalloc/efree happens. Also can you tell me if possible how to put a breakpoint to emalloc/efree which are executed only after all core functions are registered? because it takes like a million years like this and a million F8 presses... Thanks. From: Johannes Schlüter johan...@schlueters.de To: Adi Mutu adi_mut...@yahoo.com Cc: Felipe Pena felipe...@gmail.com; PHP Developers Mailing List internals@lists.php.net Sent: Thursday, June 7, 2012 10:44 PM Subject: Re: [PHP-DEV] concatenation operator On Thu, 2012-06-07 at 11:50 -0700, Adi Mutu wrote: that's nice, but i haven't understood a thing...i know something about php core and php extensions, but nothing about the Zend engine specific. The mentioned place is directly in the VM, which in general is harder to understand, but well, it directs to the concat_function on http://lxr.php.net/xref/PHP_TRUNK/Zend/zend_operators.c#1234 Knowing basic C should be enough to understand the code there. The actual algorithm can also easily be guessed (allocate a buffer which can hold both strings at once and copy them over,the code is a tiny bit more complex as it tries tore use an existing buffer than allocating something completely new) The question is: What do you actually want to know? Can you point me to some resources on this topic? Unfortunately not. The source is the best documentation we have for that. johannes -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DEV] concatenation operator
Hello, Can somebody point me to where the concatenation operator is implemented ? . operator. Thanks,
Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET
Thanks Julien, but i've already read your article using translator and did not found an answer to that (i've also sent you an email about Zend mm a few days ago) laurence site looks down to me. Perhaps the link is wrong? Thanks, A. From: jpauli jpa...@php.net To: Adi Mutu adi_mut...@yahoo.com Cc: internals@lists.php.net internals@lists.php.net Sent: Friday, March 2, 2012 3:43 PM Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET Laruence and I wrote articles about ZendMM internals. You would find them at http://www.laruence.com/2011/11/09/2277.html and http://julien-pauli.developpez.com/tutoriels/php/internals/zend-memory-manager/ . You can use any translator to get them in English For basic use, see the readme at http://lxr.php.net/xref/PHP_5_4/Zend/README.ZEND_MM Hope this helps :) Julien.P On Fri, Mar 2, 2012 at 1:51 PM, Adi Mutu adi_mut...@yahoo.com wrote: Hello, Can somebody shed some light on these 2 defines? Thanks. #define ZEND_MM_SMALL_FREE_BUCKET(heap, index) \ (zend_mm_free_block*) ((char*)heap-free_buckets[index * 2] + \ sizeof(zend_mm_free_block*) * 2 - \ sizeof(zend_mm_small_free_block)) #define ZEND_MM_REST_BUCKET(heap) \ (zend_mm_free_block*)((char*)heap-rest_buckets[0] + \ sizeof(zend_mm_free_block*) * 2 - \ sizeof(zend_mm_small_free_block))
Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET
Now that's really awesome.:) I have to do something so i can access and subscribe to that blog. Are you serious about that firewall? That would be my first time i actually encounter a problem because of this. From: Ferenc Kovacs tyr...@gmail.com To: Adi Mutu adi_mut...@yahoo.com Cc: jpauli jpa...@php.net; internals@lists.php.net internals@lists.php.net Sent: Friday, March 2, 2012 4:00 PM Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET On Fri, Mar 2, 2012 at 2:57 PM, Adi Mutu adi_mut...@yahoo.com wrote: Thanks Julien, but i've already read your article using translator and did not found an answer to that (i've also sent you an email about Zend mm a few days ago) laurence site looks down to me. Perhaps the link is wrong? Thanks, A. I blame the Great Firewall of China could you try that the following link works for you: http://translate.google.com/translate?sl=zh-CNtl=enjs=nprev=_thl=huie=UTF-8layout=2eotf=1u=http%3A%2F%2Fwww.laruence.com%2F2011%2F11%2F09%2F2277.html -- Ferenc Kovács @Tyr43l - http://tyrael.hu
Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET
Already added in google reader..now i see the site is accesible also, strange. I've looked at the picture, read your explanation, but i still didn't get it.i'll think some more about this and perhaps i'll suggest you a better translation at the end. Thanks! From: Laruence larue...@php.net To: Adi Mutu adi_mut...@yahoo.com Cc: Ferenc Kovacs tyr...@gmail.com; jpauli jpa...@php.net; internals@lists.php.net internals@lists.php.net Sent: Friday, March 2, 2012 4:52 PM Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET On Fri, Mar 2, 2012 at 10:12 PM, Adi Mutu adi_mut...@yahoo.com wrote: Now that's really awesome.:) I have to do something so i can access and subscribe to that blog. Hi: Google reader is a good choice~ :) I am so glad you like it. thanks . Are you serious about that firewall? That would be my first time i actually encounter a problem because of this. From: Ferenc Kovacs tyr...@gmail.com To: Adi Mutu adi_mut...@yahoo.com Cc: jpauli jpa...@php.net; internals@lists.php.net internals@lists.php.net Sent: Friday, March 2, 2012 4:00 PM Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET On Fri, Mar 2, 2012 at 2:57 PM, Adi Mutu adi_mut...@yahoo.com wrote: Thanks Julien, but i've already read your article using translator and did not found an answer to that (i've also sent you an email about Zend mm a few days ago) laurence site looks down to me. Perhaps the link is wrong? Thanks, A. I blame the Great Firewall of China could you try that the following link works for you: http://translate.google.com/translate?sl=zh-CNtl=enjs=nprev=_thl=huie=UTF-8layout=2eotf=1u=http%3A%2F%2Fwww.laruence.com%2F2011%2F11%2F09%2F2277.html -- Ferenc Kovács @Tyr43l - http://tyrael.hu -- Laruence Xinchen Hui http://www.laruence.com/
Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET
I think that caching part you're talking about is in function zend_mm_alloc_int..i don't see what caching has to do with these macros... but i maybe mistaking of course. What i don't understand is those additions and substracting in those macros..but i'll read more tomorrow. From: Stas Malyshev smalys...@sugarcrm.com To: Adi Mutu adi_mut...@yahoo.com Cc: internals@lists.php.net internals@lists.php.net Sent: Friday, March 2, 2012 8:44 PM Subject: Re: [PHP-DEV] ZEND_MM_SMALL_FREE_BUCKET and ZEND_MM_REST_BUCKET Hi! #define ZEND_MM_SMALL_FREE_BUCKET(heap, index) \ (zend_mm_free_block*) ((char*)heap-free_buckets[index * 2] + \ sizeof(zend_mm_free_block*) * 2 - \ sizeof(zend_mm_small_free_block)) #define ZEND_MM_REST_BUCKET(heap) \ (zend_mm_free_block*)((char*)heap-rest_buckets[0] + \ sizeof(zend_mm_free_block*) * 2 - \ sizeof(zend_mm_small_free_block)) IIRC the purpose of these defines is that the MM caches small free blocks so that it could find them faster, so that for example allocating zvals (frequent case) goes faster. So it has a small cache for such blocks, by size, so the allocator can for example quickly find a free block of size of zval or of size of Hashtable. These macros try to find such free block for given small size (first one) or for the rest of blocks (i.e. bigger blocks which share one free list). -- Stanislav Malyshev, Software Architect SugarCRM: http://www.sugarcrm.com/ (408)454-6900 ext. 227 -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DEV] question about Zend MM
Hello, I want to understand how Zend MM works, so i'm looking trought the sources and i see this: #define ZEND_MM_ALIGNMENT_MASK ~(ZEND_MM_ALIGNMENT-1) #define ZEND_MM_ALIGNED_SIZE(size)(((size) + ZEND_MM_ALIGNMENT - 1) ZEND_MM_ALIGNMENT_MASK) I understand that the first define will create something like 1000 ( it will clear last 3 bits) but what does the 2nd define? Before clearing the last 3 bytes why does it add ZEND_MM_ALIGNMENT- 1 to size? Thanks,
Re: [PHP-DEV] question about Zend MM
Ah, now i got it..so it can also return size, if size is directly a multiple of ZEND_MM_ALIGNMENT. I was convinced that it has to be stricly than size, i guess i was wrong. From: Gustavo Lopes glo...@nebm.ist.utl.pt To: Adi Mutu adi_mut...@yahoo.com; internals@lists.php.net Sent: Thursday, March 1, 2012 6:44 PM Subject: Re: [PHP-DEV] question about Zend MM On Thu, 01 Mar 2012 17:22:23 +0100, Adi Mutu adi_mut...@yahoo.com wrote: I want to understand how Zend MM works, so i'm looking trought the sources and i see this: #define ZEND_MM_ALIGNMENT_MASK ~(ZEND_MM_ALIGNMENT-1) #define ZEND_MM_ALIGNED_SIZE(size) (((size) + ZEND_MM_ALIGNMENT - 1) ZEND_MM_ALIGNMENT_MASK) I understand that the first define will create something like 1000 ( it will clear last 3 bits) but what does the 2nd define? Before clearing the last 3 bytes why does it add ZEND_MM_ALIGNMENT- 1 to size? It basically just rounds to the next multiple of ZEND_MM_ALIGNMENT, assuming ZEND_MM_ALIGNMENT is a power of 2. ZEND_MM_ALIGNMENT is a power of 2, so it has 1 bit set. Subtracting 1 will zero that bit and and flip on all the other less significant bits. Then negating flips the bits so that now the bits less significant than the log2(ZEND_MM_ALIGNMENT)-th will be zero and the others will be one. ZEND_MM_ALIGNED_SIZE adds ZEND_MM_ALIGNMENT - 1 and applies the mask. The effect is that the result will be = size and it will be a multiple of ZEND_MM_ALIGNMENT (in particular the smallest multiple of ZEND_MM_ALIGNMENT that's = the argument) because the bits less significant than the log2(ZEND_MM_ALIGNMENT)-th will be zero. a n-1 is the same as a mod n with n being a power of 2. So if a ZEND_MM_ALIGNMENT - 1 == 0 then a mod ZEND_MM_ALIGNMENT == 0 and a is a multiple of ZEND_MM_ALIGNMENT. --Gustavo Lopes
Re: [PHP-DEV] how to debug a php script ( the C code beneath it)
Thanks Julien I don't know french, but i'll read it using google translate:) From: jpauli jpa...@php.net To: Adi Mutu adi_mut...@yahoo.com Cc: Ángel González keis...@gmail.com; PHP Developers Mailing List internals@lists.php.net Sent: Tuesday, February 14, 2012 11:17 AM Subject: Re: [PHP-DEV] how to debug a php script ( the C code beneath it) 2012/2/14 Adi Mutu adi_mut...@yahoo.com Perhaps i didn't explain correctly, my bad, sorry. Basically what I want to see is the corresponding C code which is executed, i could put a break in gdb, but how do I know at which C function to put it, if i don't know the internals of php very good? And the answer is : you cant. Simply put, you have to study the code first, before knowing through which line it will go. That's not very easy, as you can count on ~800.000 lines in trunk. To see the path, use valgrind + callgrind. You'll get a very cool graph like this : http://julien-pauli.developpez.com/tutoriels/php/internals/presentation/images/PHPInternals-callgraph.png You could use gdb with the .gdbinit from trunk. Using it with CDT is much more cool as it is GUI. I wrote some article about PHP internals, mainly describing how it works. It's in french ( http://julien-pauli.developpez.com/tutoriels/php/internals/presentation) with some schema. Mainly, the hardest part is ZendVM. If you dont have to debug ZendVM, it's kinda easy and logic. Cheers Julien.Pauli From: Ángel González keis...@gmail.com To: Adi Mutu adi_mut...@yahoo.com Cc: PHP Developers Mailing List internals@lists.php.net Sent: Tuesday, February 14, 2012 1:11 AM Subject: Re: [PHP-DEV] how to debug a php script ( the C code beneath it) On 13/02/12 21:48, Adi Mutu wrote: Hello, Perhaps this is a stupid question, but i haven't coded in C in years and i'm not very familiar with development/debugging tools. If I have a php script say 20 lines, How can I see a path of the corresponding C code which is executed? What If i would like to break at a certain php line in the script, is it possible? Thanks, Why do you want to do it? It looks to me like that you are trying to solve a problem the hard way by doing that.
Re: [PHP-DEV] how to debug a php script ( the C code beneath it)
I know about the zif_* functions and i'm already using lxr.php.net.
Didn't know about Gcc -e trick though, that might be usefull.
Thanks.
From: jpauli jpa...@php.net
To: Rasmus Lerdorf ras...@php.net
Cc: Adi Mutu adi_mut...@yahoo.com; PHP Developers Mailing List
internals@lists.php.net
Sent: Tuesday, February 14, 2012 7:36 PM
Subject: Re: [PHP-DEV] how to debug a php script ( the C code beneath it)
On Tue, Feb 14, 2012 at 6:28 PM, Rasmus Lerdorf ras...@php.net wrote:
On 02/14/2012 09:22 AM, Adi Mutu wrote:
Thanks Julien
I don't know french, but i'll read it using google translate:)
If you just want to see some of the function calls, most calls that are
visible in userspace are prefixed with zif_ internally.
eg.
% gdb sapi/cli/php
GNU gdb (Ubuntu/Linaro 7.3-0ubuntu2) 7.3-2011.08
...
(gdb) b zif_strlen
Breakpoint 1 at 0x7b2760: file
/home/rasmus/php-src/branches/PHP_5_3/Zend/zend_builtin_functions.c,
line 455.
(gdb) run -r 'echo strlen(123);'
Breakpoint 1, zif_strlen (ht=1, return_value=0x1200eb0,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=1)
at
/home/rasmus/php-src/branches/PHP_5_3/Zend/zend_builtin_functions.c:455
455 {
(gdb) l
450
451
452 /* {{{ proto int strlen(string str)
453 Get string length */
454 ZEND_FUNCTION(strlen)
455 {
456 char *s1;
457 int s1_len;
-Rasmus
--
PHP Internals - PHP Runtime Development Mailing List
To unsubscribe, visit: http://www.php.net/unsub.php
Yeah, that's the PHP_FUNCTION() macro. 'zif' meaning Zend Internal
Function.
One more step would be to read the preprocessed code (GCC -E), as PHP
source heavily uses macros
If you want, you can also read the source code online using the excellent
http://lxr.php.net :)
Julien.P
Re: [PHP-DEV] how to debug a php script ( the C code beneath it)
I know about the zif_* functions and i'm already using lxr.php.net.
Didn't know about gcc -E trick though, that might be usefull.
Thanks.
From: jpauli jpa...@php.net
To: Rasmus Lerdorf ras...@php.net
Cc: Adi Mutu adi_mut...@yahoo.com; PHP Developers Mailing List
internals@lists.php.net
Sent: Tuesday, February 14, 2012 7:36 PM
Subject: Re: [PHP-DEV] how to debug a php script ( the C code beneath it)
On Tue, Feb 14, 2012 at 6:28 PM, Rasmus Lerdorf ras...@php.net wrote:
On 02/14/2012 09:22 AM, Adi Mutu wrote:
Thanks Julien
I don't know french, but i'll read it using google translate:)
If you just want to see some of the function calls, most calls that are
visible in userspace are prefixed with zif_ internally.
eg.
% gdb sapi/cli/php
GNU gdb (Ubuntu/Linaro 7.3-0ubuntu2) 7.3-2011.08
...
(gdb) b zif_strlen
Breakpoint 1 at 0x7b2760: file
/home/rasmus/php-src/branches/PHP_5_3/Zend/zend_builtin_functions.c,
line 455.
(gdb) run -r 'echo strlen(123);'
Breakpoint 1, zif_strlen (ht=1, return_value=0x1200eb0,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=1)
at
/home/rasmus/php-src/branches/PHP_5_3/Zend/zend_builtin_functions.c:455
455 {
(gdb) l
450
451
452 /* {{{ proto int strlen(string str)
453 Get string length */
454 ZEND_FUNCTION(strlen)
455 {
456 char *s1;
457 int s1_len;
-Rasmus
--
PHP Internals - PHP Runtime Development Mailing List
To unsubscribe, visit: http://www.php.net/unsub.php
Yeah, that's the PHP_FUNCTION() macro. 'zif' meaning Zend Internal Function.
One more step would be to read the preprocessed code (GCC -E), as PHP
source heavily uses macros
If you want, you can also read the source code online using the excellent
http://lxr.php.net :)
Julien.P
[PHP-DEV] how to debug a php script ( the C code beneath it)
Hello, Perhaps this is a stupid question, but i haven't coded in C in years and i'm not very familiar with development/debugging tools. If I have a php script say 20 lines, How can I see a path of the corresponding C code which is executed? What If i would like to break at a certain php line in the script, is it possible? Thanks,
Re: [PHP-DEV] how to debug a php script ( the C code beneath it)
Perhaps i didn't explain correctly, my bad, sorry. Basically what I want to see is the corresponding C code which is executed, i could put a break in gdb, but how do I know at which C function to put it, if i don't know the internals of php very good? From: Ángel González keis...@gmail.com To: Adi Mutu adi_mut...@yahoo.com Cc: PHP Developers Mailing List internals@lists.php.net Sent: Tuesday, February 14, 2012 1:11 AM Subject: Re: [PHP-DEV] how to debug a php script ( the C code beneath it) On 13/02/12 21:48, Adi Mutu wrote: Hello, Perhaps this is a stupid question, but i haven't coded in C in years and i'm not very familiar with development/debugging tools. If I have a php script say 20 lines, How can I see a path of the corresponding C code which is executed? What If i would like to break at a certain php line in the script, is it possible? Thanks, Why do you want to do it? It looks to me like that you are trying to solve a problem the hard way by doing that.
[PHP-DEV] zend guard
Hello, Can anybody tell me what this struct is used for ? I'm new to the internals of php. Thanks, A
Re: [PHP-DEV] Re: Zend mm
Thanks a lot, for all the help about zend mm guys, i'm very grateful. Thanks,A. --- On Sun, 1/30/11, Ben Schmidt mail_ben_schm...@yahoo.com.au wrote: From: Ben Schmidt mail_ben_schm...@yahoo.com.au Subject: Re: [PHP-DEV] Re: Zend mm To: Adi Mutu adi_mut...@yahoo.com Cc: internals@lists.php.net, t...@daylessday.org Date: Sunday, January 30, 2011, 4:45 PM On 30/01/11 4:11 AM, Adi Mutu wrote: I have looked at the sources, but i'm only at the begining of analyzing the php sources.i've understand how to write extensions for example, but this memory manager seems more complicated to me. Yes, it is. Memory management is a low-level and subtle area. It takes a lot of careful thought to design and even to understand the algorithms involved. It is hard to debug, because an error caused in one place may not show itself until completely different code is executing. It is also an area which doesn't change much. Almost all the other code in the PHP interpreter, and therefore PHP scripts themselves, rely on the memory manager code doing its job unintrusively and correctly, so once it is working well, it tends to be left that way, except for fixing small bugs as they are found, or a big and careful development effort to address some limitation (e.g. improving the garbage collection to collect cycles, which was something done fairly recently). The bottom line is that this is not an area that is all that easy for beginners to get their teeth into. But it's also an area that isn't necessary for beginners to understand in much detail, either. Unless you have a particular project in mind that involves the memory manager, you probably don't need to touch it. I don't want to discourage you, but just point out that perhaps this is something you might look at later, or even not at all, as you may find there are many worthwhile projects that take up all your time before you ever get to understanding the memory manager fully. It would be useful if for example, could explain me the structures that are used in the Zend memory manager, how they're chained etc.and if you can tell me in words what do zend_mm_aloc_int() and zend_mm_free_int() basically do...Thank you for your time,Adrian I suspect these structures and functions are fairly easy to understand by someone familiar with the area of memory management, which is why you have been advised to consult the source code. So perhaps what you need to do is not learn about PHP's memory manager, but just learn about memory management in general. Then it should be fairly easy to understand what PHP's memory manager is doing from its code. I'm afraid I doubt the people here have the time to teach you this over email. :-) So here are some references which might be of use to you. - I believe the 'standard textbook' for learning about memory management is this one here: http://www.cs.kent.ac.uk/people/staff/rej/gcbook/gcbook.html - This page also mentions that a new edition is due out soon: http://c2.com/cgi/wiki?GarbageCollectionBook - You can also check out this site: http://www.memorymanagement.org/ - Relating this to, PHP: PHP is a garbage collected language which I believe uses reference counting and a clever collector to detect and free cycles. I haven't looked in detail into the implementation, but I know some documentation is available on the subject here: http://www.php.net/manual/en/features.gc.php Hope this helps! Ben.
[PHP-DEV] Re: Zend mm
I have looked at the sources, but i'm only at the begining of analyzing the php sources.i've understand how to write extensions for example, but this memory manager seems more complicated to me. It would be useful if for example, could explain me the structures that are used in the Zend memory manager, how they're chained etc.and if you can tell me in words what do zend_mm_aloc_int() and zend_mm_free_int() basically do...Thank you for your time,Adrian
[PHP-DEV] Zend mm
Hello, Nobody can help me understand better the internals of the zend memory manager? Thanks,Adrian
[PHP-DEV] zend memory manager
Hello, Where can I find some references to read about the Zend mm? I'm not talking about emalloc/efree (or pemalloc/pefree), i'm talking about lower level functions like zend_mm_aloc_int and zend_mm_free_int, structs like zend_mm_heap etc.I've tried looking at the sources, but it's not very clear for meI'm a beginner at php C developing. Thanks,
