php-in-php: VmFs readlink/symlink/touch — drop host @readlink/@symlink/@touch delegation (#7971 phase 3)

[PurHur]

Category

php-in-php | runtime-shrink | bootstrap

Problem

VmFs::readlink(), VmFs::symlink(), and VmFs::touch() still call host Zend builtins (@readlink, @symlink, @touch) on the VM path. JIT/AOT already use libc via JitReadlink / JitSymlink / __compiler_touch (StringFsDirJit). Self-host must not depend on Zend for these syscalls (#7971 phase 3, pairs #6982/#742/#3227).

php-src reference

• ext/standard/link.c — readlink/symlink
• ext/standard/filestat.c — php_touch

Repro

grep -n '@readlink\|@symlink\|@touch' ext/standard/VmFs.php

Scope

Path	Work
ext/standard/VmFsPathNative.php	add readlink(2)/symlinkat(2) FFI
ext/standard/VmFsTouchNative.php (new)	utime/stat/open touch parity with StringFsDirJit::emitTouch
ext/standard/VmFs.php	route VM through native helpers
Tests	extend VmFsRuntimeShrinkTest

Done when

• No @readlink/@symlink/@touch in VmFs.php
• --filter VmFsRuntimeShrink green + readlink/touch compliance PHPT
• PR notes 0 C runtime lines added

Related

#7971 #6982 #742 #3227 #1492

[PurHur]

claim: PHP Runtime → PHP — starting this run

[PurHur]

Merged via #8432.

Verification:

• vendor/bin/phpunit --filter "VmFsRuntimeShrink|VmFsPathNative|TouchBuiltinTest::testVm|ReadlinkBuiltinTest::testVm" test/unit/ — OK (12 tests)
• make bootstrap-selfhost-link — OK
• grep '@readlink\|@symlink\|@touch' ext/standard/VmFs.php — no matches (host delegation removed)

C runtime: 0 lines added; only phpc_progress.c remains under lib/AOT/runtime/.