php-in-php: JIT StringGetrusage — route getrusage() through VmGetrusageNative PHP not struct rusage LLVM (#1492)

[PurHur]

Category

php-in-php · stdlib

Problem

getrusage() VM reads process stats via ext/standard/VmGetrusageNative.php (libc getrusage(2) FFI) with VmGetrusagePure.php fallback, but JIT reimplements Linux struct rusage layout in lib/JIT/Builtin/StringGetrusage.php (__compiler_getrusage, hard-coded x86_64 offsets). Layout duplication is fragile and blocks PHP-in-PHP (#1492).

php-src reference

• php/php-src ext/standard/basic_functions.c — PHP_FUNCTION(getrusage)
• php/php-src ext/standard/microtime.c — resource usage helpers

Repro

<?php
$ru = getrusage();
var_export(is_array($ru));
echo "\n";
var_export(isset($ru['ru_utime.tv_sec'], $ru['ru_maxrss']));
echo "\n";
$ru1 = getrusage(1); // RUSAGE_CHILDREN — may be false on some platforms
var_export($ru1 === false || is_array($ru1));

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php repro_getrusage.php
php bin/jit.php repro_getrusage.php
php -r "var_export(isset(getrusage()[\"ru_maxrss\"]));"
'

Runtime	Associative keys match php-src
VM	yes
JIT	must match VM after fix

Scope

Layer	Path
VM SSOT	ext/standard/getrusage.php, VmGetrusageNative.php, VmGetrusagePure.php
JIT	ext/standard/JitGetrusageArg.php + route to PHP helper
Shrink	lib/JIT/Builtin/StringGetrusage.php offset table
Tests	test/compliance/cases/stdlib/getrusage_jit_vm.phpt

Done when (php-src-strict)

• Repro array keys identical VM vs JIT
• __compiler_getrusage LLVM implementation removed
• ./script/ci-fast.sh --filter getrusage_jit green

Related

• php-in-php: getrusage() — delete phpc_getrusage.c (~78 lines), native VmProcess without host getrusage() #5388 / php-in-php: VmMemory RSS path — remove host getrusage() fallback for bootstrap self-host (#4862, #3280) #7287 getrusage VM · php-in-php: VmGetrusageNative — pure PHP getrusage() from /proc, drop libc getrusage FFI (#1492) #8970 pure PHP fallback · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492

[PurHur]

claim: PHP Runtime → PHP — starting this run.

[PurHur]

Merged via #10833.

PHP path: ext/standard/GetrusageJitHelper.php → VmProcess::getrusage() (SSOT: VmGetrusageNative / VmGetrusagePure).

C/LLVM shrink: lib/JIT/Builtin/StringGetrusage.php reduced from ~236 lines of hard-coded x86_64 struct rusage offsets + libc getrusage LLVM to a 51-line thin link into StringGetrusageRuntime.

Verification:

• vendor/bin/phpunit --filter "GetrusageJitRuntimeShrinkTest|StringGetrusageRuntimeStandaloneTest|GetrusageJITTest" — OK (4 tests)
• vendor/bin/phpunit --filter getrusage test/compliance/ — OK (14 tests)
• make bootstrap-selfhost-vm-driver-execute-probe — OK