Stdlib: ReflectionClass::getTraitAliases() — trait adaptation map missing (ext/reflection/php_reflection.c) #6661

Category

stdlib | runtime

Problem

ReflectionClass::getTraitAliases() returns the trait use adaptation map (alias => original) for classes that rename trait methods. The VM ReflectionClass object does not expose this method — calls fail at method_exists / fatal on invoke.

Inheritance predicates (isSubclassOf, getTraits, …) are tracked in #6302. This issue is the trait alias introspection API only.

php-src reference

• php/php-src ext/reflection/php_reflection.c — reflection_class_get_trait_aliases
• php/php-src Zend/zend_classtable.c — trait alias table on zend_class_entry

Repro

test/repro-maintainer/reflection_class_trait_aliases.php:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro-maintainer/reflection_class_trait_aliases.php
php bin/vm.php test/repro-maintainer/reflection_class_trait_aliases.php'

Scope (this repo)

Store alias map in PHP class metadata; do not add C reflection tables.

Done when

• Repro: method_exists($rc, 'getTraitAliases') true on VM.
• Class with use T { f as g; } returns ['g' => 'T::f'] matching Zend.
• Class without aliases returns empty array (not null).
• JIT stub optional; VM compliance is sufficient for this ticket.

Implementation (PHP-in-PHP)

• Store trait alias map on class entries during trait merge (lib/Compiler.php / ext/standard/VmReflection.php).
• VM builtin: ReflectionClass::getTraitAliases() in lib/VM/Builtin/ + register in reflection dispatch.
• Optional JIT stub only after VM green.

Verification

• Repro green on VM
• Add test/compliance/cases/stdlib/reflection_class_trait_aliases.phpt

Strictness

php-src-strict