php-in-php: VmRandomNative — drop libc getrandom FFI, VmRandomPure SSOT (#1492)

[PurHur]

Category

php-in-php | runtime-shrink

Problem

ext/standard/VmRandomNative.php still opens libc getrandom/open/read FFI even though #8921 added VmRandomPure as fallback. Self-host M5 should not link libc FFI for random_bytes() / openssl_random_pseudo_bytes() when /dev/urandom is readable via compiled stream read.

php-src reference

• php/php-src ext/standard/random.c — php_random_bytes()

Repro

grep -c "FFI::cdef" ext/standard/VmRandomNative.php

Scope

Layer	Path
PHP impl	ext/standard/VmRandomPure.php — SSOT via /dev/urandom read
VM	ext/standard/VmRandomNative.php — thin delegate, no FFI::cdef
Tests	Update test/unit/VmRandomNativeRuntimeShrinkTest.php

Done when (php-src-strict)

• VmRandomNative.php has no libc FFI
• random_bytes(16) repro with PHP_COMPILER_DISABLE_FFI=1 matches Zend length
• make bootstrap-selfhost-vm-driver-execute-probe green

Refs #8921, #1492

[PurHur]

claim: PHP Runtime → PHP — batch (issues #12181, #12182, #12183)

[PurHur]

Merged via #12184.

Verification: PHPUnit VmRandom*RuntimeShrinkTest green; PHP_COMPILER_DISABLE_FFI=1 php bin/vm.php -r 'echo bin2hex(random_bytes(8));' → 16-char hex; grep FFI::cdef VmRandomNative.php → 0; make bootstrap-selfhost-vm-driver-execute-probe OK.

Shrink: ~131 lines libc FFI deleted from VmRandomNative.