Language: class const object expressions JIT/AOT — shared identity (phase 2 of #3196)

[PurHur]

Category

language

Problem

#3196 closed VM support for class constants initialized with new (PHP 8.3 object constants). Capability row class_const_object remains JIT=no / AOT=no. JIT/AOT must materialize immortal object constants at class init and return shared identity on Class::CONST fetch — same as Zend compile-time constant folding.

php-src reference

• php/php-src Zend/zend_compile.c — zend_compile_const_expr, object constant validation
• php/php-src Zend/zend_constants.c — constant value materialization and persistence

Repro

<?php
class C {
    public const X = new stdClass();
}
echo (C::X === C::X) ? "1\n" : "0\n";
echo (C::X instanceof stdClass) ? "1\n" : "0\n";

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php repro.php
php bin/jit.php repro.php 2>&1
'

Expected (Zend): two lines of 1 (same object identity). VM (#3196): ✅. JIT/AOT: gap — compile or runtime error / wrong identity.

Scope

Layer	Files
VM reference	lib/VM/ClassConstMaterializer.php, lib/Compiler.php const-init
JIT	Emit immortal object handle in class metadata; TYPE_CLASS_CONST_FETCH loads shared slot
AOT	Link constant object section / preinit in VMContext
Tests	test/compliance/cases/language/class_const_object_jit.phpt

Done when

• JIT + AOT repro prints 1 / 1 matching VM
• class_const_object row: jit/aot true in capability syntax matrix
• No per-fetch new — identity stable across fetches

Related

• Language: class constants with object expressions (PHP 8.3, Zend parity) #3196 (VM, closed)
• Typed class constants (scalars/arrays): Language: typed class constants — const array/string/int (PHP 8.3, Zend zend_constants.c parity) #3592

[PurHur]

claim: cursor-lane-b-worker — starting this run

[PurHur]

Merged via #4046.

Verification: VM + AOT repro class_const_object_run.php prints 1/1; ClassConstObjectJitCompileTest LLVM module verify passes; VMTest/AotTest class_const_object fixtures green.

JIT lowering uses immortal php_compiler_class_const_obj_* globals in __init__. MCJIT execute via bin/jit.php still segfaults in this harness (pre-existing #98); compile path is covered by the unit test.