php-in-php: drop shouldDeferHeavyStreamIoEmitters from JitEnv putenv — thin via isThinStandaloneAotMain (#1492)

[PurHur]

Category

php-in-php · runtime-shrink (#1492, peer ObOutput #20443 / PendingHeaders #20420 / getenv #20156)

Problem

ext/standard/JitEnv.php still gates deferred user-script / inventory putenv on StreamIoRuntime::shouldDeferHeavyStreamIoEmitters() (inventory-emit + NestedJit defer bag + standaloneInitPhase). Peer getenv (#20156) and ObOutput (#20443) already use Context::isThinStandaloneAotMain() for the same thin-standalone constraint (#16075 / #13571 / #17316).

Under M3 inventory emit / standaloneInitPhase the StreamIo defer bag forces libc-only setenv and skips GetenvJitHelper::putenv NestedJIT when not thin-standalone — so putenv overlay / syntax path stays stubbed broader than necessary.

Mode	Today	Target
Embed / non-thin	GetenvJitHelper::putenv + libc mirror	unchanged
User-script / bootstrap thin AOT	shouldDeferHeavyStreamIoEmitters → libc-only (emitLibcPutenvMirror)	isThinStandaloneAotMain() → same libc-only (#17316)
Inventory emit / M3 driver / standaloneInitPhase	deferred via StreamIo defer bag (libc-only)	honest NestedJIT helper + libc mirror when not thin

php-src reference

• php/php-src ext/standard/basic_functions.c — zif_putenv / zif_getenv

PHP implementation target

• ext/standard/JitEnv.php — gate libc-only putenv / skip-helper on $context->isThinStandaloneAotMain(); drop shouldDeferHeavyStreamIoEmitters (and unused StreamIoRuntime import if unused)
• test/unit/PutenvRuntimeShrinkTest.php (new) — assert isThinStandaloneAotMain on JitEnv, no shouldDeferHeavyStreamIoEmitters

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/unit/PutenvRuntimeShrinkTest.php
vendor/bin/phpunit test/unit/GetenvJitRuntimeShrinkTest.php
make bootstrap-selfhost-vm-driver-execute-probe
'

Done when

• shouldDeferHeavyStreamIoEmitters removed from JitEnv.php
• Thin path gated on isThinStandaloneAotMain only (libc-only retained for thin AOT)
• Shrink test green
• make bootstrap-selfhost-vm-driver-execute-probe green
• PR body cites defer-gate lines removed

Refs #1492, #20156, #20443, #17316, #9092

[PurHur]

claim: PHP Runtime → PHP — starting this run

Pre-flight (this workspace)

Gate	Result
php script/bootstrap-inventory.php --check	OK 5646/5646
./script/release-readiness.sh --json	user_release_ready: yes
north-star5-fast / vm-driver-probe	ok
First failing command	none

Implementing: gate JitEnv putenv libc-only path on isThinStandaloneAotMain() (peer #20443 / #20156).

[PurHur]

Merged via #20500 (ada45d9c)

Verification

• vendor/bin/phpunit test/unit/PutenvRuntimeShrinkTest.php — OK (2)
• vendor/bin/phpunit test/unit/GetenvJitRuntimeShrinkTest.php — OK
• vendor/bin/phpunit test/unit/EnvLocalRuntimeShrinkTest.php — OK
• make bootstrap-selfhost-vm-driver-execute-probe — OK

Shrink

• Removed StreamIoRuntime import + 2 shouldDeferHeavyStreamIoEmitters() sites from ext/standard/JitEnv.php (libc-only thin AOT now via isThinStandaloneAotMain()).