https://github.com/pmmp/ext-recursionguard

Lightweight PHP extension to hard-cap function call depth.
https://github.com/pmmp/ext-recursionguard

github-actions-enabled php php-extension php80 php81 php82

Last synced: about 24 hours ago
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Lightweight PHP extension to hard-cap function call depth.

• Host: GitHub
• URL: https://github.com/pmmp/ext-recursionguard
• Owner: pmmp
• Created: 2018-12-05T22:18:00.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2023-11-24T13:00:56.000Z (10 months ago)
• Last Synced: 2024-09-21T15:30:59.914Z (6 days ago)
• Topics: github-actions-enabled, php, php-extension, php80, php81, php82
• Language: C
• Homepage:
• Size: 28.3 KB
• Stars: 3
• Watchers: 8
• Forks: 0
• Open Issues: 3
• Metadata Files:
  • Readme: README.md

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README

        
# ext-recursionguard

![CI](https://github.com/pmmp/ext-recursionguard/workflows/CI/badge.svg)

Lightweight PHP extension to hard-cap function call depth.

## Features

This extension will throw an `Error` if the function call stack reaches a depth of `256` calls. This is currently non-configurable, but usable for most cases.

## Configuration

- `recursionguard.enabled` (default `1`): Controls whether the extension will guard for recursions even when loaded (useful for static builds).

## Motivation

Recursion errors can be difficult to debug because they cause PHP to crash without any stack trace when something overrides `zend_execute_ex`. Therefore, it's desirable to have this barf at a hard limit instead of segfaulting without apparent reason.

However, the only way to do this before now was the `xdebug` extension, which causes huge performance degradation and as such is unsuitable for production. This extension keeps to the point, causing a hit of only 10% extra function call overhead, versus `xdebug`'s 2000+% overhead. This additional overhead becomes insignificant outside of synthetic benchmarks.