php-in-php: base64_encode()/base64_decode() JIT via Base64JitHelper PHP — drop inline LLVM in JitBase64*.php (#1492) #17234

Category

php-in-php · runtime-shrink / JIT LLVM → Vm PHP

Problem

ext/standard/JitBase64Encode.php (~204 lines) and JitBase64Decode.php (~233 lines) embed inline LLVM for RFC 4648 base64, duplicating VmString::base64_encode() / VmString::base64_decode() (landed in #978).

Sibling string builtins (bin2hex, hex2bin, …) already route through PHP JitHelpers + lib/JIT/Builtin/String* bridges.

php-src reference

• php/php-src ext/standard/base64.c — PHP_FUNCTION(base64_encode), PHP_FUNCTION(base64_decode)

PHP implementation target

• ext/standard/Base64EncodeJitHelper.php — SSOT delegating to VmString::base64_encode()
• ext/standard/Base64DecodeJitHelper.php — SSOT delegating to VmString::base64_decode() (runtime JIT path: non-strict empty-string on failure, matching current LLVM)
• lib/JIT/Builtin/StringBase64Encode.php / StringBase64Decode.php — thin __compiler_base64_* bridges via nested JIT
• lib/JIT/Builtin/StringBase64*Llvm.php — user-script AOT defer (Stdlib/AOT: standalone binary run segfault (exit 139) after compile — Docker harness JIT-linked builtins #16734)
• Shrink ext/standard/base64_*.php call() — route through bridges; retain JitBase64*.php LLVM only for defer path

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php -r "
echo base64_encode(\"foo\"), \"\\n\";
echo base64_decode(\"Zm9v\"), \"\\n\";
"'
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter Base64'

Done when

• Runtime JIT/AOT base64 routes through Base64*JitHelper PHP (not inline LLVM in hot path)
• Base64RuntimeShrinkTest guard + existing base64_* compliance green VM+JIT+AOT
• Spine includes helpers + bridges; php script/check-selfhost-spine-coverage-sync.php OK
• PR notes LLVM lines removed from hot path

Refs #978, north star #1492