Stdlib: split process JIT helpers for AOT exec capture (#10492)

[PurHur]

Summary

• Split ProcessJitHelper into lazy-linked units: ProcessPhpcRunCommandJitHelper (iterateKeyed env), ProcessExecCaptureNativeJitHelper (phpc_native_ht_* + shell_exec capture), keeping shell/escape helpers in a minimal ProcessJitHelper.php.
• Add phpc_native_ht_set_string_key_long + ParseStrNativeOpsJit::setStringKeyLong for native hashtable status fields.
• Fix ObOutputJitBridge / ObOutputUserScriptLlvm insert-block restore when ensureLinked() is called nested from JitExec::writeLinesToStdout.

Root cause

AOT compile of any script using shell_exec/exec/passthru/system nested-JITed all of ProcessJitHelper.php, hitting HashTable::iterateKeyed() (object::iteratekeyed) and VM HashTable::add() in stream loops. Master fails at compile with Call to undefined method object::iteratekeyed().

Verification

# VM repro (php-src-strict) — PASS
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro/maintainer_gap_system_passthru_ob.php'
# system_ob_ok=1 / passthru_ob_ok=1

# Unit — PASS
./script/docker-exec.sh -- bash -lc 'vendor/bin/phpunit test/unit/ProcessRuntimeShrinkTest.php test/unit/ExecJitRuntimeShrinkTest.php'

# AOT shell_exec / exec — compile phase PASS (link may need -lcrypto in image)
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/compile.php -o /tmp/x -r "\$o=[]; exec(\"echo hi\", \$o); echo count(\$o);" && echo compile_ok'
# exit 2 = link only (no LLVM verify failure)

# AOT system_passthru fixture — FAIL (LLVM verify)
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/aot/AotTest.php --filter system_passthru'
# Module verification: AddrSpaceCast source must be a pointer in JitExec::writeLinesToStdout ob-echo path

Remaining blocker (not merged)

passthru()/system() AOT compile reaches JitExec::writeLinesToStdout but LLVM verify fails (AddrSpaceCast source must be a pointer) when routing captured lines through user-script ob echo (ObOutputUserScriptLlvm). Next: align __phpc_ob_echo_substr arg lowering with EmbedObEchoBridge in user-script AOT mode.

Closes #10492 when system_passthru_ob AOT fixture is green.

Made with Cursor

[PurHur]

Maintainer triage 2026-07-05: VM repro + unit tests green per PR body; AOT system_passthru LLVM verify still red — holding merge until ObOutput user-script lowering fixed. Supersedes overlap with #16470 (iterateKeyed split landed here).

[PurHur]

Maintainer triage 2026-07-05: VM repro + unit tests pass per PR body; merge blocked on AOT AddrSpaceCast verify in JitExec::writeLinesToStdout / ObOutputUserScriptLlvm. Re-run vendor/bin/phpunit test/aot/AotTest.php --filter system_passthru before merge.