minor #23216 Remove HHVM support (second edition) (Nek-)

This PR was squashed before being merged into the 4.0-dev branch (closes #23216).

Discussion
----------

Remove HHVM support (second edition)

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | not needed

This PR removes HHVM compatiblity following #22758 as some things were missing. It also removes some useless comments.

Commits
-------

471b84c Remove HHVM support (second edition)

src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php

@@ -62,7 +62,7 @@ function ($key, $value, $isHit) {
      */
     public static function create($file, CacheItemPoolInterface $fallbackPool)
     {
-        // Shared memory is available in PHP 7.0+ with OPCache enabled and in HHVM
+        // Shared memory is available in PHP 7.0+ with OPCache enabled
         if (ini_get('opcache.enable')) {
             if (!$fallbackPool instanceof AdapterInterface) {
                 $fallbackPool = new ProxyAdapter($fallbackPool);

src/Symfony/Component/Cache/Simple/PhpArrayCache.php

@@ -45,7 +45,7 @@ public function __construct($file, CacheInterface $fallbackPool)
      */
     public static function create($file, CacheInterface $fallbackPool)
     {
-        // Shared memory is available in PHP 7.0+ with OPCache enabled and in HHVM
+        // Shared memory is available in PHP 7.0+ with OPCache enabled
         if (ini_get('opcache.enable')) {
             return new static($file, $fallbackPool);
         }

src/Symfony/Component/Debug/ErrorHandler.php

@@ -382,10 +382,8 @@ public function handleError($type, $message, $file, $line)
 
         if (4 < $numArgs = func_num_args()) {
             $context = $scope ? (func_get_arg(4) ?: array()) : array();
-            $backtrace = 5 < $numArgs ? func_get_arg(5) : null; // defined on HHVM
         } else {
             $context = array();
-            $backtrace = null;
         }
 
         if (isset($context['GLOBALS']) && $scope) {
@@ -394,15 +392,6 @@ public function handleError($type, $message, $file, $line)
             $context = $e;
         }
 
-        if (null !== $backtrace && $type & E_ERROR) {
-            // E_ERROR fatal errors are triggered on HHVM when
-            // hhvm.error_handling.call_user_handler_on_fatals=1
-            // which is the way to get their backtrace.
-            $this->handleFatalError(compact('type', 'message', 'file', 'line', 'backtrace'));
-
-            return true;
-        }
-
         $logMessage = $this->levels[$type].': '.$message;
 
         if (null !== self::$toStringException) {
@@ -436,11 +425,12 @@ public function handleError($type, $message, $file, $line)
 
             // Clean the trace by removing function arguments and the first frames added by the error handler itself.
             if ($throw || $this->tracedErrors & $type) {
-                $backtrace = $backtrace ?: $errorAsException->getTrace();
+                $backtrace = $errorAsException->getTrace();
                 $lightTrace = $this->cleanTrace($backtrace, $type, $file, $line, $throw);
                 $this->traceReflector->setValue($errorAsException, $lightTrace);
             } else {
                 $this->traceReflector->setValue($errorAsException, array());
+                $backtrace = array();
             }
         }
 
@@ -454,32 +444,25 @@ public function handleError($type, $message, $file, $line)
                         && ('trigger_error' === $backtrace[$i - 1]['function'] || 'user_error' === $backtrace[$i - 1]['function'])
                     ) {
                         // Here, we know trigger_error() has been called from __toString().
-                        // HHVM is fine with throwing from __toString() but PHP triggers a fatal error instead.
+                        // PHP triggers a fatal error when throwing from __toString().
                         // A small convention allows working around the limitation:
                         // given a caught $e exception in __toString(), quitting the method with
                         // `return trigger_error($e, E_USER_ERROR);` allows this error handler
                         // to make $e get through the __toString() barrier.
 
                         foreach ($context as $e) {
-                            if (($e instanceof \Exception || $e instanceof \Throwable) && $e->__toString() === $message) {
-                                if (1 === $i) {
-                                    // On HHVM
-                                    $errorAsException = $e;
-                                    break;
-                                }
+                            if ($e instanceof \Throwable && $e->__toString() === $message) {
                                 self::$toStringException = $e;
 
                                 return true;
                             }
                         }
 
-                        if (1 < $i) {
-                            // On PHP (not on HHVM), display the original error message instead of the default one.
-                            $this->handleException($errorAsException);
+                        // Display the original error message instead of the default one.
+                        $this->handleException($errorAsException);
 
-                            // Stop the process by giving back the error to the native handler.
-                            return false;
-                        }
+                        // Stop the process by giving back the error to the native handler.
+                        return false;
                     }
                 }
             }

src/Symfony/Component/HttpKernel/ControllerMetadata/ArgumentMetadataFactory.php

@@ -52,12 +52,7 @@ private function getType(\ReflectionParameter $parameter)
         if (!$type = $parameter->getType()) {
             return;
         }
-        $typeName = $type->getName();
-        if ('array' === $typeName && !$type->isBuiltin()) {
-            // Special case for HHVM with variadics
-            return;
-        }
 
-        return $typeName;
+        return $type->getName();
     }
 }

src/Symfony/Component/Intl/Data/Bundle/Reader/IntlBundleReader.php

@@ -34,7 +34,6 @@ public function read($path, $locale)
             // Never enable fallback. We want to know if a bundle cannot be found
             $bundle = new \ResourceBundle($locale, $path, false);
         } catch (\Exception $e) {
-            // HHVM compatibility: constructor throws on invalid resource
             $bundle = null;
         }
 

src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php

@@ -177,11 +177,6 @@ private function extractFromMutator($class, $property)
         }
         $type = $this->extractFromReflectionType($reflectionType);
 
-        // HHVM reports variadics with "array" but not builtin type hints
-        if (!$reflectionType->isBuiltin() && Type::BUILTIN_TYPE_ARRAY === $type->getBuiltinType()) {
-            return;
-        }
-
         if (in_array($prefix, $this->arrayMutatorPrefixes)) {
             $type = new Type(Type::BUILTIN_TYPE_ARRAY, false, null, true, new Type(Type::BUILTIN_TYPE_INT), $type);
         }

src/Symfony/Component/Translation/Loader/IcuDatFileLoader.php

@@ -39,7 +39,6 @@ public function load($resource, $locale, $domain = 'messages')
         try {
             $rb = new \ResourceBundle($locale, $resource);
         } catch (\Exception $e) {
-            // HHVM compatibility: constructor throws on invalid resource
             $rb = null;
         }
 

src/Symfony/Component/Translation/Loader/IcuResFileLoader.php

@@ -39,7 +39,6 @@ public function load($resource, $locale, $domain = 'messages')
         try {
             $rb = new \ResourceBundle($locale, $resource);
         } catch (\Exception $e) {
-            // HHVM compatibility: constructor throws on invalid resource
             $rb = null;
         }