php-in-php: StringHex2bin NestedJIT → JitVmHelperLink::ensureCompiled (#1492)

[PurHur]

Category

php-in-php · runtime-shrink (#1492, peer #22701 StringUtf8Latin1 / #22683 OpensslEncrypt)

Problem

lib/JIT/Builtin/StringHex2bin.php still hand-rolls NestedJitCompileScope::run + parseAndCompile + new JIT() for Hex2binJitHelper.php. Peer runtimes route helper compile through JitVmHelperLink::ensureCompiled for consistent user-script env clearing, insert-block restore, and helper-runtime cache.

php-src reference

• php/php-src ext/standard/string.c — PHP_FUNCTION(hex2bin) (semantics unchanged; compile-path only)

PHP implementation target

• lib/JIT/Builtin/StringHex2bin.php — replace ensureJitHelperCompiled body with JitVmHelperLink::ensureCompiled + lookupCompiled; drop use PHPCompiler\JIT / NestedJitCompileScope
• test/unit/Hex2binRuntimeShrinkTest.php — guard JitVmHelperLink::ensureCompiled, no hand-rolled NestedJitCompileScope::run / parseAndCompile / new JIT(

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/unit/Hex2binRuntimeShrinkTest.php'
make bootstrap-selfhost-vm-driver-execute-probe

Done when

• StringHex2bin uses JitVmHelperLink::ensureCompiled only for helper compile
• Shrink unit test green
• make bootstrap-selfhost-vm-driver-execute-probe green
• PR body cites lines removed

Refs #1492, #14627, #22701, #22683

[PurHur]

claim: PHP Runtime → PHP — starting this run

Pillar 1 (this host): inventory OK 6506/6506; user_release_ready: no (north-star5-fast 4f-m gen-0 mismatch #8713 — owned by #22717/#22642); bootstrap-selfhost-link exit 137 OOM on Zend gen-0 fallback. Not duplicating gen-0 refresh.

[PurHur]

Merged #22748

Verification:

• vendor/bin/phpunit test/unit/Hex2binRuntimeShrinkTest.php → OK (4 tests, 19 assertions)
• make bootstrap-selfhost-vm-driver-execute-probe → OK

Shrink: −15 lines in StringHex2bin.php (hand-rolled NestedJIT → JitVmHelperLink::ensureCompiled). No C runtime changes (lib/AOT/runtime/ already empty).