Hash: scaffold standalone AOT __compiler_hash bridges (#3357)

[PurHur]

Summary

Scaffolds the missing standalone-AOT path for hash() / hash_hmac() / incremental hash_final() digest emission (#3357).

Root cause (diagnosed): __compiler_hash ABI stubs from lib/JIT/Builtin/Type.php never received bodies during PHP_COMPILER_AOT_USER_SCRIPT=1 init because StringHashCrypto was absent from ensureMinimalUserStandaloneBodies() and nested HashCryptoJitHelper JIT is deferred for user-script AOT (#16734).

Changes

• StringHashCryptoLlvm — thin JitVmHelperLink::ensureBridge wrappers for __compiler_hash* ABIs
• StringHashCryptoJit — UserScriptAotDeferNestedJit gate → LLVM bridges vs PHP helper path
• Context::ensureMinimalUserStandaloneBodies() — link hash crypto during user-script standalone init
• StringHashCryptoPhp::callHelperBridge — extractStringPtrFromHelperResult for non-defer builds

php-src ref: ext/hash/hash.c, ext/standard/hash.c

Verification (2026-07-11)

# VM/JIT — green (unchanged)
php bin/vm.php test/repro/hash_context_incremental.php
php bin/jit.php test/repro/hash_context_incremental.php
./script/phpunit.sh --filter HashModuleTest

# AOT — still red (empty digest stdout; no longer segfaults on hash_context)
tmpdir=$(mktemp -d)
php bin/compile.php -o "$tmpdir/h" -r 'echo hash("sha256","hello"),"\n";'
"$tmpdir/h"   # prints blank line (expected 2cf24dba…)
./script/phpunit.sh --filter 'AotTest.*hash_raw_output'   # FAIL: bin2hex(hash(...)) empty
./script/phpunit.sh --filter 'AotTest.*hash_context_incremental'  # FAIL: empty stdout (exit 0)

Next step: JitVmHelperLink bridge calls cached HashCryptoJitHelper unit but coerceBridgeResult / helper link returns null __string__* at execute. Bisect helper .o link + bridge return coercion (restored pre-#9164 StringHashCryptoNativeJit emits wrong digests and segfaults on hash_context).

Partial progress toward #3357 — not merge-ready.

Closes #3357 when hash_raw_output + hash_context_incremental AOT fixtures green.

Made with Cursor

[PurHur]

Progress update (2026-07-11):

• Dropped StringHashCryptoLlvm / JitVmHelperLink path for user-script AOT — cached helper units skip __init__ (Epic: architecture rearrangement — TU-based pipeline, differential gates, generated maintenance (docs/architecture-review-2026-07.md) #16075) and return null digests.
• Both implement() and ensureStandaloneBodies() now call StringHashCryptoPhp::implement($context, true) to nested-compile HashCryptoJitHelper into the main module.
• Bridge idempotency checks now key off named entry blocks (hc_hash_bridge_entry, …) instead of countBasicBlocks() > 0.

Still red:

./script/phpunit.sh --filter 'hash_raw_output|hash_context_incremental'
# hash_raw_output: 0/0 (hash returns false)
# hash_context_incremental: empty stdout

Likely next step: when a stale hash_crypto_llvm_* block remains as LLVM function entry, appendBasicBlock() does not replace it — need entry-block reuse (cf. JitVmHelperLink::bridgeEntryForEmit) or a StringHashCryptoLibc-style thin digest path for user AOT like StringFileGetContentsLibc (#15309).

[PurHur]

Maintainer triage 2026-07-12: not merge-ready — PR body documents AOT digest still empty (hash_raw_output / hash_context_incremental red). Bootstrap gates green on main (bootstrap-selfhost-link + helloworld). Please rebase (mergeable: CONFLICTING) and keep WIP until AOT fixtures green per Closes #3357 criteria.