PCRE JIT stack size limit

From: Date: Thu, 23 Jul 2015 11:07:09 +0000
Subject: PCRE JIT stack size limit
Groups: php.internals 
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Hi! PHP7 supports PCRE's JIT compilation of patterns by default, which mostly works fine. However, there are issues when the matching exceeds the JIT stack limit, see bug #70110[1]. I'm not sure how to solve this best. Basically, I see two possible solutions: either we fall back to non JIT matching, if pcre_exec() fails with PCRE_ERROR_JIT_STACKLIMIT, or we use a custom JIT stack and make its size a configurable ini setting (similar to pcre.backtrack_limit), and raise E_WARNING if the matching fails due to limited stack size. Thoughts? [1] <https://bugs.php.net/bug.php?id=70110> -- Christoph M. Becker

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