php-in-php: JIT LateStaticBindingHelper — route static:: class resolution through VmLateStatic PHP not ~152-line LLVM (#1492)

[PurHur]

Category

php-in-php · language

Problem

Late static binding (static::class, static::method(), new static) uses lib/JIT/LateStaticBindingHelper.php (~152 LOC) with a module-global phpc_late_static_class_id LLVM global and standalone-JIT special cases (#4792).

VM resolves called scope via PHP frame metadata (get_called_scope parity). LLVM path duplicates this and is fragile for self-host/AOT.

php-src reference

• php/php-src Zend/zend_execute.c — get_called_scope(), ZEND_FETCH_CLASS, ZEND_INIT_STATIC_METHOD_CALL
• php/php-src Zend/zend_compile.c — static:: compile

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php -r "class B{public static function c():string{return static::class;}} class D extends B{} echo D::c();" 2>&1
php bin/jit.php -r "class B{public static function c():string{return static::class;}} class D extends B{} echo D::c();" 2>&1
wc -l lib/JIT/LateStaticBindingHelper.php
'

Engine	D::c() via static::class
Zend	'D'
VM -r	'D' ✅ (verify)
JIT	verify matches; refactor to PHP trampoline

Scope (PHP-in-PHP)

Path	Work
lib/JIT/LateStaticBindingHelper.php	Trampoline to VM called_scope resolver
lib/VM/LateStaticBinding.php	SSOT for scope id → class name
lib/JIT/LateStaticBindingHelper.php	Remove phpc_late_static_class_id global when PHP path sufficient

Done when

• JIT static::class, static::method(), new static match VM on repro + compliance cases
• LLVM global/class-id path deleted or gated to legacy AOT only with comment
• ./script/ci-fast.sh --filter LateStatic green

Related

• Language: new static() / : static return — JIT/AOT execute parity (phase 2 of #3412) #4792 · php-in-php: JIT ClassConstFetchHelper — route dynamic class const LLVM through VmClassConst PHP not ~887-line monolith (#1492) #10200 ClassConstFetch · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492

[PurHur]

claim: PHP Runtime → PHP — starting this run.

[PurHur]

Merged via #10727.

What changed: LateStaticBindingHelper no longer emits inline LLVM for effective called-class id; standalone JIT/AOT routes through compiled LateStaticJitHelper (LateStaticBindingRuntime bridge). VM lateStaticClassLc() shares lib/VM/LateStaticBinding.php SSOT. Global phpc_late_static_class_id moved to thin LateStaticBindingGlobals.

Shrink: LateStaticBindingHelper.php ~153→110 LOC; inline global/module cache removed from helper.

Verification:

• VM/JIT repro: D::c() via static::class → D
• vendor/bin/phpunit --filter LateStatic — OK (6 tests)
• vendor/bin/phpunit test/unit/LateStaticRuntimeShrinkTest.php — OK (3 tests)
• php script/check-selfhost-spine-coverage-sync.php — OK