Leverage native lazy proxies

Author: nicolas-grekas

src/Symfony/Component/VarExporter/Internal/LazyObjectRegistry.php

@@ -20,127 +20,5 @@
  */
 class LazyObjectRegistry
 {
-    /**
-     * @var array<class-string, \ReflectionClass>
-     */
-    public static array $classReflectors = [];
-
-    /**
-     * @var array<class-string, array<string, mixed>>
-     */
-    public static array $defaultProperties = [];
-
-    /**
-     * @var array<class-string, list<\Closure>>
-     */
-    public static array $classResetters = [];
-
-    /**
-     * @var array<class-string, array{get: \Closure, set: \Closure, isset: \Closure, unset: \Closure}>
-     */
-    public static array $classAccessors = [];
-
-    /**
-     * @var array<class-string, array{set: bool, isset: bool, unset: bool, clone: bool, serialize: bool, unserialize: bool, sleep: bool, wakeup: bool, destruct: bool, get: int}>
-     */
-    public static array $parentMethods = [];
-
-    public static ?\Closure $noInitializerState = null;
-
-    public static function getClassResetters($class)
-    {
-        $classProperties = [];
-
-        if ((self::$classReflectors[$class] ??= new \ReflectionClass($class))->isInternal()) {
-            $propertyScopes = [];
-        } else {
-            $propertyScopes = Hydrator::$propertyScopes[$class] ??= Hydrator::getPropertyScopes($class);
-        }
-
-        foreach ($propertyScopes as $key => [$scope, $name, $readonlyScope]) {
-            $propertyScopes[$k = "\0$scope\0$name"] ?? $propertyScopes[$k = "\0*\0$name"] ?? $k = $name;
-
-            if ($k === $key && "\0$class\0lazyObjectState" !== $k) {
-                $classProperties[$readonlyScope ?? $scope][$name] = $key;
-            }
-        }
-
-        $resetters = [];
-        foreach ($classProperties as $scope => $properties) {
-            $resetters[] = \Closure::bind(static function ($instance, $skippedProperties) use ($properties) {
-                foreach ($properties as $name => $key) {
-                    if (!\array_key_exists($key, $skippedProperties)) {
-                        unset($instance->$name);
-                    }
-                }
-            }, null, $scope);
-        }
-
-        $resetters[] = static function ($instance, $skippedProperties) {
-            foreach ((array) $instance as $name => $value) {
-                if ("\0" !== ($name[0] ?? '') && !\array_key_exists($name, $skippedProperties)) {
-                    unset($instance->$name);
-                }
-            }
-        };
-
-        return $resetters;
-    }
-
-    public static function getClassAccessors($class)
-    {
-        return \Closure::bind(static fn () => [
-            'get' => static function &($instance, $name, $readonly) {
-                if (!$readonly) {
-                    return $instance->$name;
-                }
-                $value = $instance->$name;
-
-                return $value;
-            },
-            'set' => static function ($instance, $name, $value) {
-                $instance->$name = $value;
-            },
-            'isset' => static fn ($instance, $name) => isset($instance->$name),
-            'unset' => static function ($instance, $name) {
-                unset($instance->$name);
-            },
-        ], null, \Closure::class === $class ? null : $class)();
-    }
-
-    public static function getParentMethods($class)
-    {
-        $parent = get_parent_class($class);
-        $methods = [];
-
-        foreach (['set', 'isset', 'unset', 'clone', 'serialize', 'unserialize', 'sleep', 'wakeup', 'destruct', 'get'] as $method) {
-            if (!$parent || !method_exists($parent, '__'.$method)) {
-                $methods[$method] = false;
-            } else {
-                $m = new \ReflectionMethod($parent, '__'.$method);
-                $methods[$method] = !$m->isAbstract() && !$m->isPrivate();
-            }
-        }
-
-        $methods['get'] = $methods['get'] ? ($m->returnsReference() ? 2 : 1) : 0;
-
-        return $methods;
-    }
-
-    public static function getScope($propertyScopes, $class, $property, $readonlyScope = null)
-    {
-        if (null === $readonlyScope && !isset($propertyScopes[$k = "\0$class\0$property"]) && !isset($propertyScopes[$k = "\0*\0$property"])) {
-            return null;
-        }
-        $frame = debug_backtrace(\DEBUG_BACKTRACE_PROVIDE_OBJECT | \DEBUG_BACKTRACE_IGNORE_ARGS, 3)[2];
-
-        if (\ReflectionProperty::class === $scope = $frame['class'] ?? \Closure::class) {
-            $scope = $frame['object']->class;
-        }
-        if (null === $readonlyScope && '*' === $k[1] && ($class === $scope || (is_subclass_of($class, $scope) && !isset($propertyScopes["\0$scope\0$property"])))) {
-            return null;
-        }
-
-        return $scope;
-    }
+    public static \WeakMap $initializers;
 }

src/Symfony/Component/VarExporter/Internal/LazyObjectState.php

@@ -11,20 +11,42 @@
 
 namespace Symfony\Component\VarExporter\Internal;
 
-if (\PHP_VERSION_ID >= 80300) {
+/**
+ * @internal
+ */
+trait LazyObjectTrait
+{
     /**
-     * @internal
+     * Returns whether the object is initialized.
+     *
+     * @param $partial Whether partially initialized objects should be considered as initialized
      */
-    trait LazyObjectTrait
+    public function isLazyObjectInitialized(bool $partial = false): bool
     {
-        private readonly LazyObjectState $lazyObjectState;
+        return !\ReflectionLazyObject::isLazyObject($this);
     }
-} else {
+
     /**
-     * @internal
+     * @return bool Returns false when the object cannot be reset, ie when it's not a lazy object
      */
-    trait LazyObjectTrait
+    public function resetLazyObject(): bool
     {
-        private LazyObjectState $lazyObjectState;
+        if (\ReflectionLazyObject::isLazyObject($this)) {
+            return true;
+        }
+
+        if (![$initializer, $strategy, $skippedProperties] = LazyObjectRegistry::$initializers[$this] ?? null) {
+            return false;
+        }
+
+        $r = \ReflectionLazyObject::makeLazy($this, $initializer, $strategy);
+
+        foreach ($skippedProperties as $class => $properties) {
+            foreach ($properties as $property) {
+                $r->skipProperty($property, $class);
+            }
+        }
+
+        return true;
     }
 }