[DI] Deduplicate generated proxy classes

src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php

@@ -396,6 +396,7 @@ private function collectLineage($class, array &$lineage)
 
     private function generateProxyClasses()
     {
+        $alreadyGenerated = array();
         $definitions = $this->container->getDefinitions();
         $strip = '' === $this->docStar && method_exists('Symfony\Component\HttpKernel\Kernel', 'stripComments');
         $proxyDumper = $this->getProxyDumper();
@@ -404,8 +405,12 @@ private function generateProxyClasses()
             if (!$proxyDumper->isProxyCandidate($definition)) {
                 continue;
             }
+            if (isset($alreadyGenerated[$class = $definition->getClass()])) {
+                continue;
+            }
+            $alreadyGenerated[$class] = true;
             // register class' reflector for resource tracking
-            $this->container->getReflectionClass($definition->getClass());
+            $this->container->getReflectionClass($class);
             $proxyCode = "\n".$proxyDumper->getProxyCode($definition);
             if ($strip) {
                 $proxyCode = "<?php\n".$proxyCode;

src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php

@@ -576,6 +576,19 @@ public function testCircularReferenceAllowanceForInlinedDefinitionsForLazyServic
         $this->addToAssertionCount(1);
     }
 
+    public function testDedupLazyProxy()
+    {
+        $container = new ContainerBuilder();
+        $container->register('foo', 'stdClass')->setLazy(true)->setPublic(true);
+        $container->register('bar', 'stdClass')->setLazy(true)->setPublic(true);
+        $container->compile();
+
+        $dumper = new PhpDumper($container);
+        $dumper->setProxyDumper(new \DummyProxyDumper());
+
+        $this->assertStringEqualsFile(self::$fixturesPath.'/php/services_dedup_lazy_proxy.php', $dumper->dump());
+    }
+
     public function testLazyArgumentProvideGenerator()
     {
         require_once self::$fixturesPath.'/includes/classes.php';

src/Symfony/Component/DependencyInjection/Tests/Fixtures/includes/classes.php

@@ -90,12 +90,12 @@ public function isProxyCandidate(Definition $definition)
 
     public function getProxyFactoryCode(Definition $definition, $id, $factoryCall = null)
     {
-        return "        // lazy factory\n\n";
+        return "        // lazy factory for {$definition->getClass()}\n\n";
     }
 
     public function getProxyCode(Definition $definition)
     {
-        return "// proxy code\n";
+        return "// proxy code for {$definition->getClass()}\n";
     }
 }
 

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dedup_lazy_proxy.php

@@ -0,0 +1,88 @@
+<?php
+
+use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
+
+/**
+ * This class has been auto-generated
+ * by the Symfony Dependency Injection Component.
+ *
+ * @final since Symfony 3.3
+ */
+class ProjectServiceContainer extends Container
+{
+    private $parameters;
+    private $targetDirs = array();
+
+    public function __construct()
+    {
+        $this->services = array();
+        $this->methodMap = array(
+            'bar' => 'getBarService',
+            'foo' => 'getFooService',
+        );
+
+        $this->aliases = array();
+    }
+
+    public function getRemovedIds()
+    {
+        return array(
+            'Psr\\Container\\ContainerInterface' => true,
+            'Symfony\\Component\\DependencyInjection\\ContainerInterface' => true,
+        );
+    }
+
+    public function compile()
+    {
+        throw new LogicException('You cannot compile a dumped container that was already compiled.');
+    }
+
+    public function isCompiled()
+    {
+        return true;
+    }
+
+    public function isFrozen()
+    {
+        @trigger_error(sprintf('The %s() method is deprecated since Symfony 3.3 and will be removed in 4.0. Use the isCompiled() method instead.', __METHOD__), E_USER_DEPRECATED);
+
+        return true;
+    }
+
+    protected function createProxy($class, \Closure $factory)
+    {
+        return $factory();
+    }
+
+    /**
+     * Gets the public 'bar' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getBarService($lazyLoad = true)
+    {
+        // lazy factory for stdClass
+
+        return new \stdClass();
+    }
+
+    /**
+     * Gets the public 'foo' shared service.
+     *
+     * @return \stdClass
+     */
+    protected function getFooService($lazyLoad = true)
+    {
+        // lazy factory for stdClass
+
+        return new \stdClass();
+    }
+}
+
+// proxy code for stdClass

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_non_shared_lazy.php

@@ -83,10 +83,10 @@ protected function getBarService()
      */
     protected function getFooService($lazyLoad = true)
     {
-        // lazy factory
+        // lazy factory for stdClass
 
         return new \stdClass();
     }
 }
 
-// proxy code
+// proxy code for stdClass