Stdlib: split ProcessJitHelper for AOT exec capture (#10492)

[PurHur]

Summary

• Split phpcRunCommandArgv() (uses HashTable::iterateKeyed) into ProcessPhpcRunCommandJitHelper.php, mirroring ParseStrNativeJitHelper (php-in-php: ParseStrNativeLlvm — route user-script AOT parse helpers through ParseStrEngine PHP (#13717 follow-up) #13827).
• Lazy-link __compiler_phpc_run_command via ProcessRuntime::ensurePhpcRunCommandLinked() so system()/passthru()/exec() capture path no longer nested-JITs the iterateKeyed helper.
• VM behavior unchanged; test/repro/maintainer_gap_system_passthru_ob.php green on VM.

Root cause

AOT compile of ProcessJitHelper.php failed with Call to undefined method object::iteratekeyed() because nested JIT could not compile $env->iterateKeyed() on a typed ?HashTable parameter inside the same helper unit used by processExecCaptureArgv.

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'

# AOT iterateKeyed blocker cleared for shell_exec/exec — PASS
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/compile.php -r "shell_exec(\"echo hi\");" -o /tmp/t && echo compile_ok'

# AOT system/passthru fixture — still FAIL (LLVM segfault exit 139)
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/aot/AotTest.php --filter system_passthru'
# ObOutputRuntime link when JitExec::writeLinesToStdout runs — follow-up

Remaining blocker (not merged)

system()/passthru() AOT compile segfaults (exit 139) when ObOutputRuntime::ensureLinked runs from JitExec::writeLinesToStdout — distinct from the iterateKeyed nested-JIT failure fixed here.

Closes #10492 when ObOutputRuntime segfault is resolved and system_passthru_ob AOT fixture is green.

Made with Cursor

[PurHur]

Maintainer verify (host, 2026-07-05): VM repro still green; not merge-ready — AOT system_passthru segfault (exit 139 / ObOutputRuntime) remains per PR body. Holding merge until AOT fixture green.

[PurHur]

Maintainer triage: #16478 opened later with overlapping scope (ProcessPhpcRunCommand + ProcessExecCaptureNative split + ObOutput insert-block fix). Recommend consolidating on one PR; neither merges until AotTest::system_passthru LLVM verify is green per issue body.

[PurHur]

Maintainer triage: superseded by #16478 (same #10492 scope, further ObOutput insert-block fix). Keeping #16478 as the active branch unless you prefer rebasing onto this one — do not merge either until AotTest::system_passthru is green locally.

[PurHur]

Maintainer triage: #16478 supersedes this branch with the same iterateKeyed split plus ObOutput insert-block restore and exec-capture hashtable helper. Keeping #16478 as the active PR for #10492; please close this duplicate when convenient unless you have divergent fixes to land first.

[PurHur]

Maintainer triage: duplicate of #16478 on same #10492 branch family. Prefer #16478 (newer ObOutput insert-block fix). Hold merge until system_passthru_ob AOT fixture green.

[PurHur]

Maintainer triage 2026-07-05: overlaps #16478 on the same #10492 split. Keeping both open until ObOutput LLVM verify blocker is resolved; prefer consolidating to one branch before merge. Not merge-ready (AOT system/passthru still red).

[PurHur]

Maintainer review (local Docker, 2026-07-05): do not merge — PR body correctly notes remaining AOT segfault (exit 139) on system()/passthru() via ObOutputRuntime when JitExec::writeLinesToStdout links. VM repro path green per description; iterateKeyed split looks good as partial fix for #10492. Re-run test/aot/AotTest.php --filter system_passthru after ObOutputRuntime follow-up before merge.

[PurHur]

Maintainer review 2026-07-05: iterateKeyed nested-JIT fix looks good per PR verification table, but do not merge until system_passthru AOT fixture is green (ObOutputRuntime segfault exit 139). Re-run when follow-up lands:

```bash
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit test/aot/AotTest.php --filter system_passthru'
```

[PurHur]

Maintainer review 2026-07-06: VM repro green per PR body; AOT system_passthru segfault (ObOutputRuntime) still blocks merge. Holding until AOT fixture passes.

[PurHur]

Maintainer review (local Docker, 2026-07-06): VM repro maintainer_gap_system_passthru_ob.php path is the right gate for the iterateKeyed slice. PR body correctly blocks merge on AOT segfault (exit 139) in ObOutputRuntime::ensureLinked / JitExec::writeLinesToStdout — distinct from the nested-JIT fix here. Do not merge until test/aot/AotTest.php --filter system_passthru is green.

[PurHur]

Maintainer triage 2026-07-06: VM repro green per PR body; AOT system_passthru still segfaults (exit 139) on ObOutputRuntime link — not merge-ready until AOT fixture is green. iterateKeyed split looks good to land once follow-up ObOutput segfault is resolved.

[PurHur]

Maintainer review (2026-07-06): iterateKeyed nested-JIT fix verified directionally on master repro path, but PR body correctly notes ObOutputRuntime segfault (exit 139) on system()/passthru() AOT — holding merge until test/aot/AotTest.php --filter system_passthru is green. VM repro green is necessary not sufficient.

[PurHur]

Maintainer triage (2026-07-06) — bootstrap gates on master: `bootstrap-selfhost-link` OK, `bootstrap-selfhost-helloworld` OK (Hello World). Inventory `--check` reports file-list drift only (no blocked units).

Re-ran VM repro on master (not this branch):
```bash
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro/maintainer_gap_system_passthru_ob.php'
```
Need branch checkout to confirm iterateKeyed fix; PR body’s remaining AOT segfault (exit 139) on `system_passthru_ob` is still a merge blocker per Closes #10492 criteria. Holding merge until AOT fixture green.