php-in-php: JIT StringHashCrypto — route hash()/hash_hmac() through VmHash PHP not __compiler_hash_* LLVM (#1492)

[PurHur]

Category

php-in-php · php-src-strict

Problem

hash(), hash_hmac(), hash_pbkdf2(), and related builtins have VM implementations in ext/standard/VmHash.php, but JIT/AOT link StringHashCryptoJit which lowers to native __compiler_hash_* LLVM helpers (OpenSSL/libcrypto paths in lib/JIT/Builtin/StringHashCrypto.php / StringHashCryptoJit.php).

This duplicates crypto semantics in C/LLVM, blocks M5 self-host shrink (#1492), and risks algorithm/encoding drift vs VM.

php-src reference

• php/php-src ext/standard/hash.c — PHP_FUNCTION(hash), hash_hmac
• php/php-src ext/standard/hash_hmac.c
• This repo VM: ext/standard/VmHash.php, ext/standard/hash.php, hash_hmac.php

Repro

<?php
echo hash('sha256', 'abc'), "\n";
echo hash_hmac('sha256', 'data', 'key'), "\n";

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php repro.php
php bin/jit.php repro.php
# Compare; JIT today uses __compiler_hash_* not VmHash PHP
'

Scope (this repo)

Layer	Work
JIT	Route StringHashCrypto / StringHashCryptoJit through compiled VmHash helpers (mirror StringFormatJit → VmSprintf pattern)
AOT	Same
C shrink	Remove unused __compiler_hash_* LLVM emitters when PHP path covers all algorithms in matrix
Tests	JIT rows on existing test/compliance/cases/stdlib/hash*.phpt

Done when

• JIT/AOT hash() / hash_hmac() match VM on compliance PHPTs (incl. invalid algo ValueError)
• PR body cites php-src paths + PHP implementation location; notes C symbols deleted
• No regression on hash_equals() / hash_hmac_algos() (may share helper module)

Ref: #1492 · #7189

[PurHur]

claim: PHP Runtime → PHP — batch (issues #9164, hash_equals slice)

[PurHur]

Partial merge via #10922 — hash_equals JIT/AOT now routes through HashEqualsJitHelper → VmHash::equals. hash() / hash_hmac() LLVM migration remains on this issue.

[PurHur]

claim: PHP Runtime → PHP — batch (issues #9164 hash/hash_hmac LLVM → VmHash PHP)

[PurHur]

Merged via #10972.

LLVM shrink: deleted lib/JIT/Builtin/StringHashCryptoNativeJit.php (2857 lines).

PHP path: HashCryptoJitHelper → VmHash via thin StringHashCryptoPhp bridges (hash/hash_hmac/pbkdf2/hkdf). hash_equals already on HashEqualsJitHelper from #10922.

Verification: StringHashCryptoRuntimeShrinkTest + StringHashCryptoRuntimeStandaloneTest + JIT hash PHPTs + VM/JIT repro green; spine sync OK.