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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);
+    }
+}