php-in-php: JIT PendingHeadersRuntime — route header_list()/headers_sent() through VmHttp PHP not ~1k-line LLVM (#1492)

[PurHur]

Category

php-in-php — shrink HTTP header stack LLVM

Problem

HTTP response header bookkeeping for JIT/AOT lives in PendingHeadersRuntime.php (~1,083 lines LLVM) managing pending header lists, headers_sent() state, and related globals — parallel to PHP web helpers already used on the VM path.

This duplicates semantics that should live in ext/standard/VmHttp*.php / lib/Web/ and compile through the normal pipeline.

php-src reference

• php/php-src main/SAPI.c — sapi_header_op(), sapi_send_headers()
• php/php-src ext/standard/head.c — header(), headers_sent(), header_remove(), header_register_callback()

Repro

wc -l lib/JIT/Builtin/PendingHeadersRuntime.php

./script/docker-exec.sh -- php bin/vm.php -r '
header("X-Test: 1");
var_export(headers_sent());
var_export(header_list());
'

# JIT/AOT must match after migration:
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/jit.php -r "
header(\"X-Test: 1\");
var_export(headers_sent());
"'

Scope (this repo)

Path	Work
ext/standard/VmHttp.php / VmHttpResponse.php	SSOT pending header list + sent flag
lib/JIT/Builtin/PendingHeadersRuntime.php	Thin bridge only
lib/JIT/Builtin/HttpResponseCode.php	Coordinate with #9344 migration
Tests	test/compliance/cases/web/headers_sent.phpt, @group serve

Done when

• PendingHeadersRuntime.php >80% line reduction; PHP owns semantics
• VM + JIT/AOT agree on repro (headers_sent false before output, true after, header_list contents)
• Web example examples/001-SimpleWeb stays green
• PR lists deleted LLVM/C symbols

Related

• php-in-php: JIT HttpResponseCode — route http_response_code() through VmHttpResponse PHP not LLVM globals (#1492) #9344 HttpResponseCode PHP-in-PHP
• AOT: Per-request superglobal refresh in native binary (not compile-time bake) #201 CGI header path
• North star Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492

[PurHur]

Duplicate of #9545 (PendingHeadersRuntime php-in-php migration).