Req #80517 [Com]: Retain parent method name of Closure in call stack
Edit report at https://bugs.php.net/bug.php?id=80517&edit=1
ID: 80517
Comment by: ttijhof at wikimedia dot org
Reported by: ttijhof at wikimedia dot org
Summary: Retain parent method name of Closure in call stack
Status: Open
Type: Feature/Change Request
Package: Scripting Engine problem
Operating System: Debian stable
PHP Version: Irrelevant
Block user comment: N
Private report: N
New Comment:
The formatted outcome for this bug, may be of use in bug 62325 as the identifier or token for the
Reflection API.
Mentions:
- https://bugs.php.net/bug.php?id=62325
Backtrace gives no handle to anonymous functions
Previous Comments:
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[2020-12-15 02:55:51] ttijhof at wikimedia dot org
Description:
------------
When an anonymous function is encountered on the stack, it is currently not feasible (afaik) to
obtain the name of the class/method or function where the closure was declared.
My use case is a sampling profiler observing EG(current_execute_data), in which I'd like to
report something more useful and stable to the end-user than file path and line number.
This information would be useful to expose via debug_backtrace() as well, although maybe that should
could be a separate ticket.
Downstream code: https://github.com/wikimedia/php-excimer/
Downstream task: https://phabricator.wikimedia.org/T231335
Downstream use case: Flame graphs, such as https://performance.wikimedia.org/php-profiling/
Test script:
---------------
class ResourceLoader {
public function getHashes() {
return array_map( function ( $module ) {
return $this->getModule( $module )->getVersionHash();
}, $moduleNames );
}
}
Expected result:
----------------
Able to construct a string like "Closure$ResourceLoader::getHashes".
Before Wikimedia upgraded to PHP 7.2, we used HHVM and its Xenon extension, which provided
"faux" function name for closures that were unique over a given code base and added
signifant value for developers as part of stack traces.
Example:
https://github.com/facebook/hhvm/blob/HHVM-3.23.4/hphp/tools/gdb/README.md#stacktraces
https://github.com/facebook/hhvm/blob/HHVM-3.23.4/hphp/test/slow/closure/name.php.expect
Note that a method could define multiple closures, in which we could append a number to them. HHVM
did this by appending "#2" as needed. XHProf does something similar for nested functions,
by appending "@2" to the faux function name.
Actual result:
--------------
function_name:
class_name:
filename: /tmp/foo.php
closure_line: 3
For closures, we currently format this as {closure:/tmp/foo.php(3)}
https://github.com/wikimedia/php-excimer/blob/d82eaf7b3b/excimer_log.c#L311
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Edit this bug report at https://bugs.php.net/bug.php?id=80517&edit=1
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