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diff --git a/vendor/symfony/dependency-injection/Compiler/AnalyzeServiceReferencesPass.php b/vendor/symfony/dependency-injection/Compiler/AnalyzeServiceReferencesPass.php
new file mode 100644
index 000000000..681f8afdd
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+++ b/vendor/symfony/dependency-injection/Compiler/AnalyzeServiceReferencesPass.php
@@ -0,0 +1,152 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Run this pass before passes that need to know more about the relation of
+ * your services.
+ *
+ * This class will populate the ServiceReferenceGraph with information. You can
+ * retrieve the graph in other passes from the compiler.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class AnalyzeServiceReferencesPass implements RepeatablePassInterface
+{
+    private $graph;
+    private $container;
+    private $currentId;
+    private $currentDefinition;
+    private $repeatedPass;
+    private $onlyConstructorArguments;
+
+    /**
+     * @param bool $onlyConstructorArguments Sets this Service Reference pass to ignore method calls
+     */
+    public function __construct($onlyConstructorArguments = false)
+    {
+        $this->onlyConstructorArguments = (bool) $onlyConstructorArguments;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setRepeatedPass(RepeatedPass $repeatedPass)
+    {
+        $this->repeatedPass = $repeatedPass;
+    }
+
+    /**
+     * Processes a ContainerBuilder object to populate the service reference graph.
+     *
+     * @param ContainerBuilder $container
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $this->container = $container;
+        $this->graph = $container->getCompiler()->getServiceReferenceGraph();
+        $this->graph->clear();
+
+        foreach ($container->getDefinitions() as $id => $definition) {
+            if ($definition->isSynthetic() || $definition->isAbstract()) {
+                continue;
+            }
+
+            $this->currentId = $id;
+            $this->currentDefinition = $definition;
+
+            $this->processArguments($definition->getArguments());
+            if ($definition->getFactoryService(false)) {
+                $this->processArguments(array(new Reference($definition->getFactoryService(false))));
+            }
+            if (is_array($definition->getFactory())) {
+                $this->processArguments($definition->getFactory());
+            }
+
+            if (!$this->onlyConstructorArguments) {
+                $this->processArguments($definition->getMethodCalls());
+                $this->processArguments($definition->getProperties());
+                if ($definition->getConfigurator()) {
+                    $this->processArguments(array($definition->getConfigurator()));
+                }
+            }
+        }
+
+        foreach ($container->getAliases() as $id => $alias) {
+            $this->graph->connect($id, $alias, (string) $alias, $this->getDefinition((string) $alias), null);
+        }
+    }
+
+    /**
+     * Processes service definitions for arguments to find relationships for the service graph.
+     *
+     * @param array $arguments An array of Reference or Definition objects relating to service definitions
+     */
+    private function processArguments(array $arguments)
+    {
+        foreach ($arguments as $argument) {
+            if (is_array($argument)) {
+                $this->processArguments($argument);
+            } elseif ($argument instanceof Reference) {
+                $this->graph->connect(
+                    $this->currentId,
+                    $this->currentDefinition,
+                    $this->getDefinitionId((string) $argument),
+                    $this->getDefinition((string) $argument),
+                    $argument
+                );
+            } elseif ($argument instanceof Definition) {
+                $this->processArguments($argument->getArguments());
+                $this->processArguments($argument->getMethodCalls());
+                $this->processArguments($argument->getProperties());
+
+                if (is_array($argument->getFactory())) {
+                    $this->processArguments($argument->getFactory());
+                }
+                if ($argument->getFactoryService(false)) {
+                    $this->processArguments(array(new Reference($argument->getFactoryService(false))));
+                }
+            }
+        }
+    }
+
+    /**
+     * Returns a service definition given the full name or an alias.
+     *
+     * @param string $id A full id or alias for a service definition
+     *
+     * @return Definition|null The definition related to the supplied id
+     */
+    private function getDefinition($id)
+    {
+        $id = $this->getDefinitionId($id);
+
+        return null === $id ? null : $this->container->getDefinition($id);
+    }
+
+    private function getDefinitionId($id)
+    {
+        while ($this->container->hasAlias($id)) {
+            $id = (string) $this->container->getAlias($id);
+        }
+
+        if (!$this->container->hasDefinition($id)) {
+            return;
+        }
+
+        return $id;
+    }
+}