bug symfony#28512 [DI] fix infinite loop involving self-references in decorated services (nicolas-grekas)

This PR was merged into the 3.4 branch.

Discussion
----------

[DI] fix infinite loop involving self-references in decorated services

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#28510
| License       | MIT
| Doc PR        | -

Commits
-------

20f27f9 [DI] fix infinite loop involving self-references in decorated services

Author: nicolas-grekas

src/Symfony/Component/DependencyInjection/Compiler/AnalyzeServiceReferencesPass.php

@@ -113,6 +113,8 @@ protected function processValue($value, $isRoot = false)
                 return $value;
             }
             $this->currentDefinition = $value;
+        } elseif ($this->currentDefinition === $value) {
+            return $value;
         }
         $this->lazy = false;
 

src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php

@@ -1479,6 +1479,22 @@ public function testUninitializedSyntheticReference()
         $container->set('foo', (object) array(123));
         $this->assertEquals((object) array('foo' => (object) array(123)), $container->get('bar'));
     }
+
+    public function testDecoratedSelfReferenceInvolvingPrivateServices()
+    {
+        $container = new ContainerBuilder();
+        $container->register('foo', 'stdClass')
+            ->setPublic(false)
+            ->setProperty('bar', new Reference('foo'));
+        $container->register('baz', 'stdClass')
+            ->setPublic(false)
+            ->setProperty('inner', new Reference('baz.inner'))
+            ->setDecoratedService('foo');
+
+        $container->compile();
+
+        $this->assertSame(array('service_container'), array_keys($container->getDefinitions()));
+    }
 }
 
 class FooClass