php-in-php: hex2bin() JIT via Hex2binJitHelper PHP — drop inline LLVM in JitHex2bin.php

[PurHur]

Category

php-in-php · php-src-strict

Problem

hex2bin() VM uses VmString::hex2bin() but JIT/AOT still lowers through ~253-line JitHex2bin.php LLVM monolith (warnings + decode loop).

php-src reference

• ext/standard/string.c — PHP_FUNCTION(hex2bin)

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/jit.php -r "var_export(hex2bin(\"616263\"));"'
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php vendor/bin/phpunit --filter hex2bin'

Scope

Path	Work
ext/standard/Hex2binJitHelper.php	JIT SSOT delegating to VmString + TriggerErrorJitHelper
lib/JIT/Builtin/StringHex2bin.php	Thin __compiler_hex2bin bridge
ext/standard/hex2bin.php	Route call() through bridge
Shrink	Delete ext/standard/JitHex2bin.php

Done when

• JIT/AOT hex2bin matches Zend on compliance tests (warnings, strict, false)
• JitHex2bin.php deleted; PR notes LLVM lines removed
• make bootstrap-selfhost-vm-driver-execute-probe green

Pairs #14603 (bin2hex). Refs #1492

[PurHur]

claim: PHP Runtime → PHP — batch (issues #14626, #14627)

[PurHur]

Merged via #14637.

C shrink: deleted ext/standard/JitHex2bin.php (~253 LOC LLVM).

PHP path: Hex2binJitHelper.php → StringHex2bin __compiler_hex2bin bridge → VmString::hex2bin().

Verification:

• php vendor/bin/phpunit test/unit/Hex2binRuntimeShrinkTest.php — OK (4/4)
• php script/check-selfhost-spine-coverage-sync.php — OK
• make bootstrap-selfhost-vm-driver-execute-probe — OK
• JIT hex2bin compliance — same 2 pre-existing failures as master (Stdlib: hex2bin() — PHP Warning on odd-length input (ext/standard/string.c parity) #3764 warning message prefix)