*/
class MWExceptionHandler {
+ protected static $reservedMemory;
+ protected static $fatalErrorTypes = array(
+ E_ERROR, E_PARSE, E_CORE_ERROR, E_COMPILE_ERROR, E_USER_ERROR,
+ /* HHVM's FATAL_ERROR level */ 16777217,
+ );
+
/**
* Install handlers with PHP.
*/
public static function installHandler() {
set_exception_handler( array( 'MWExceptionHandler', 'handleException' ) );
set_error_handler( array( 'MWExceptionHandler', 'handleError' ) );
+
+ // Reserve 16k of memory so we can report OOM fatals
+ self::$reservedMemory = str_repeat( ' ', 16384 );
+ register_shutdown_function(
+ array( 'MWExceptionHandler', 'handleFatalError' )
+ );
}
/**
case E_USER_DEPRECATED:
$levelName = 'Deprecated';
break;
+ case /* HHVM's FATAL_ERROR */ 16777217:
+ $levelName = 'Fatal';
+ break;
default:
$levelName = 'Unknown error';
break;
return false;
}
+
+ /**
+ * Look for a fatal error as the cause of the request termination and log
+ * as an exception.
+ *
+ * Special handling is included for missing class errors as they may
+ * indicate that the user needs to install 3rd-party libraries via
+ * Composer or other means.
+ *
+ * @since 1.25
+ */
+ public static function handleFatalError() {
+ self::$reservedMemory = null;
+ $lastError = error_get_last();
+
+ if ( $lastError &&
+ isset( $lastError['type'] ) &&
+ in_array( $lastError['type'], self::$fatalErrorTypes )
+ ) {
+ $msg = "Fatal Error: {$lastError['message']}";
+ // HHVM: Class undefined: foo
+ // PHP5: Class 'foo' not found
+ if ( preg_match( "/Class (undefined: \w+|'\w+' not found)/",
+ $lastError['message']
+ ) ) {
+ $msg = <<<TXT
+{$msg}
+
+MediaWiki or an installed extension requires this class but it is not embedded directly in MediaWiki's git repository and must be installed separately by the end user.
+
+Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries">mediawiki.org</a> for help on installing the required components.
+TXT;
+ }
+ $e = new ErrorException( $msg, 0, $lastError['type'] );
+ self::logError( $e );
+ }
+ }
+
/**
* Generate a string representation of an exception's stack trace
*