php-in-php: strrchr() JIT via StrrchrJitHelper PHP — drop libc LLVM (#1492) #15406

Category

php-in-php · php-src-strict

Problem

strrchr() JIT still calls libc via lookupFunction('strrchr') in ext/standard/JitStrrchr.php; VM SSOT is VmString::strrchr(). Sibling readlink() already uses ReadlinkJitHelper + StringReadlink PHP bridges (#15353).

php-src reference

• php/php-src ext/standard/string.c — PHP_FUNCTION(strrchr)

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/compliance/cases/stdlib/strrchr.phpt
php bin/jit.php test/compliance/cases/stdlib/strrchr_jit.phpt'

Implementation (PHP-in-PHP)

• ext/standard/StrrchrJitHelper.php — delegate to VmString::strrchr()
• lib/JIT/Builtin/StringStrrchr.php — LLVM bridge (__phpc_jit_strrchr)
• Shrink ext/standard/JitStrrchr.php to thin wrapper (drop libc strrchr + manual slice)
• Compliance guards exist (strrchr.phpt, strrchr_jit.phpt)

Done when

• JIT strrchr no longer calls libc strrchr in JitStrrchr.php
• VM/JIT compliance green
• StrrchrRuntimeShrinkTest + spine bundle includes helper

Related

• php-in-php: readlink() JIT via ReadlinkJitHelper PHP — drop libc readlink LLVM in JitReadlink.php #15353 readlink pattern · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492