php-in-php: StringChunkSplit hand-rolled NestedJIT → JitVmHelperLink::ensureBridge (Soundex #21362 shape) (#1492) #21399

Category

php-in-php · runtime-shrink (#1492, NestedJitCompileScope audit)

Problem

lib/JIT/Builtin/StringChunkSplit.php still hand-rolls NestedJIT of ChunkSplitJitHelper (manual parseAndCompile + new JIT inside NestedJitCompileScope::run) and emits its own LLVM bridge instead of JitVmHelperLink::ensureBridge.

Peers StringSoundex / StringMetaphone (#21362 / #21342) already route through JitVmHelperLink so nested helper compile stays isolated (user-script env clear, HelperRuntimeCache).

php-src reference

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

PHP implementation target

• lib/JIT/Builtin/StringChunkSplit.php — replace hand-rolled NestedJIT + bridge with JitVmHelperLink::ensureBridge
• test/unit/ChunkSplitRuntimeShrinkTest.php — guard JitVmHelperLink::ensureBridge, no parseAndCompile / new JIT(

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/unit/ChunkSplitRuntimeShrinkTest.php
'

Done when

• StringChunkSplit uses JitVmHelperLink::ensureBridge only (no hand parseAndCompile)
• ChunkSplitRuntimeShrinkTest green
• PR cites lines removed from StringChunkSplit.php

Refs #1492, #14626, #21362, #21342