[StaticReflection] Fix unintended behavior in PHP 8.1 and later (#3340)

phpstan-baseline.neon

@@ -708,6 +708,13 @@ parameters:
 			count: 2
 			path: src/Rector/AbstractRector.php
 
+		-
+			message: """
+				#Function "class_exists\\(\\)" cannot be used/left in the code\\: use ReflectionProvider\\->has\\*\\(\\) instead#
+			"""
+			count: 1
+			path: src/StaticReflection/SourceLocator/RenamedClassesSourceLocator.php
+
 		-
 			message: """
 				#^Fetching class constant class of deprecated class Rector\\\\TypeDeclaration\\\\Rector\\\\FunctionLike\\\\ReturnTypeDeclarationRector\\:

rules-tests/Renaming/Rector/Name/RenameClassRector/FixtureRenameMissingParent/missing_parent_with_method.php.inc

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Renaming\Rector\Name\RenameClassRector\FixtureRenameMissingParent;
+
+use Missing\ParentClass;
+
+class MissingParent extends ParentClass
+{
+    public function foo(): void
+    {
+    }
+}
+
+?>
+-----
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Renaming\Rector\Name\RenameClassRector\FixtureRenameMissingParent;
+
+use Missing\ParentClass;
+
+class MissingParent extends \Renamed\Missing\ParentWithMethod
+{
+    public function foo(): void
+    {
+    }
+}
+
+?>

rules-tests/Renaming/Rector/Name/RenameClassRector/RenameMissingParentTest.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Renaming\Rector\Name\RenameClassRector;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Renaming\Rector\Name\RenameClassRector;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+/**
+ * @see RenameClassRector
+ */
+final class RenameMissingParentTest extends AbstractRectorTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/FixtureRenameMissingParent');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/rename_missing_parent.php';
+    }
+}

rules-tests/Renaming/Rector/Name/RenameClassRector/config/rename_missing_parent.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\Renaming\Rector\Name\RenameClassRector;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig
+        ->ruleWithConfiguration(RenameClassRector::class, [
+            'Missing\\ParentClass' => 'Renamed\\Missing\\ParentWithMethod',
+        ]);
+};

src/StaticReflection/SourceLocator/RenamedClassesSourceLocator.php

@@ -35,6 +35,11 @@ public function locateIdentifier(Reflector $reflector, Identifier $identifier):
                 continue;
             }
 
+            /* Use ReflectionProvider causes infinite loop */
+            if (!class_exists($oldClass)) {
+                continue;
+            }
+
             return $this->createFakeReflectionClassFromClassName($oldClass);
         }