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vendor/symfony/swiftmailer-bundle/DependencyInjection/Compiler/EnsureNoHotPathPass.php

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+<?php
+
+namespace Symfony\Bundle\SwiftmailerBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\AbstractRecursivePass;
+use Symfony\Component\DependencyInjection\Definition;
+
+/**
+ * Ensures that autoloading of Swiftmailer classes is not optimized by the hot path optimization.
+ *
+ * Swiftmailer has a special autoloader triggering the initialization of the library lazily.
+ * Bypassing the autoloader would thus break the library.
+ * This logic allows to keep applying the autoloading optimization on the container, forcing an
+ * opt-out only for the Swiftmailer classes, which is better than disabling the optimization
+ * entirely.
+ *
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class EnsureNoHotPathPass extends AbstractRecursivePass
+{
+    protected function processValue($value, $isRoot = false)
+    {
+        if ($value instanceof Definition && 0 === strpos($value->getClass(), 'Swift_')) {
+            $value->clearTag('container.hot_path');
+        }
+
+        return parent::processValue($value, $isRoot);
+    }
+}

vendor/symfony/swiftmailer-bundle/DependencyInjection/Compiler/RegisterPluginsPass.php

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+<?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\Bundle\SwiftmailerBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * RegisterPluginsPass registers Swiftmailer plugins.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class RegisterPluginsPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->findDefinition('swiftmailer.mailer') || !$container->getParameter('swiftmailer.mailers')) {
+            return;
+        }
+
+        $mailers = $container->getParameter('swiftmailer.mailers');
+        foreach ($mailers as $name => $mailer) {
+            $plugins = $this->findSortedByPriorityTaggedServiceIds($container, sprintf('swiftmailer.%s.plugin', $name));
+            $transport = sprintf('swiftmailer.mailer.%s.transport', $name);
+            $definition = $container->findDefinition($transport);
+            foreach ($plugins as $id => $args) {
+                $definition->addMethodCall('registerPlugin', [new Reference($id)]);
+            }
+        }
+    }
+
+    /**
+     * @return array
+     */
+    private function findSortedByPriorityTaggedServiceIds(ContainerBuilder $container, $tag)
+    {
+        $taggedServices = $container->findTaggedServiceIds($tag);
+        uasort(
+            $taggedServices,
+            function ($tagA, $tagB) {
+                $priorityTagA = $tagA[0]['priority'] ?? 0;
+                $priorityTagB = $tagB[0]['priority'] ?? 0;
+
+                return $priorityTagA - $priorityTagB;
+            }
+        );
+
+        return $taggedServices;
+    }
+}