[PHP 8.4] Tracing JIT wrong optimization for LazyProxy instances
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 48/100
- Issue 类型
- 缺陷
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 领域
- backend, performance
调研方向
Start by reading the linked PHP core issue #23628 and its patch, then run the existing regression tests mentioned there on PHP 8.4 with tracing JIT enabled. The report says those tests fail on PHP 8.4.27 and asks for the fix to be backported; done means the relevant tests pass on the 8.4 line with tracing JIT enabled. The issue does not name source files or tests, so finding the affected code will take familiarity with the PHP engine.
由索引模型根据 Issue 内容生成。
描述
Description
The same issue described in https://github.com/php/php-src/issues/23628 exists on the 8.4 line. It doesn't apply to 8.3 and earlier since LazyProxy wasn't added yet. It doesn't appear that the fix was backported. I figured opening a new issue for the backport request was more likely to be seen than commenting on the already-closed one :)
The existing regression tests added in the patch fail on 8.4.27 (and I assume earlier) but if you need any additional information, I'm happy to provide it.
- PHP: 8.4.27 (cli), NTS, built Nov 5 2026, from docker-library/php
- Base image: php:8.4.27-fpm-alpine3.23 (Alpine 3.23.8, x86_64)
- JIT settings: opcache.enable_cli=1, opcache.jit=tracing, opcache.jit_buffer_size=64M, opcache.jit_hot_loop=64
- Extra extensions loaded: apcu and excimer. Excimer is worth naming because it hooks into the engine, though the A/B test showed JIT alone decides pass or fail.
PHP Version
PHP 8.4.27 (cli) (built: Nov 5 2026 19:02:58) (NTS)
Copyright (c) The PHP Group
Built by https://github.com/docker-library/php
Zend Engine v4.4.27, Copyright (c) Zend Technologies
with Zend OPcache v8.4.27, Copyright (c), by Zend Technologies
Operating System
Alpine Linux 3.23.8 (official php alpine docker image)
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