Things like "Catchable fatal error: Must be X, null given" stop
execution immediately after the error handler callback, and produce
an HTTP 500 Internal Server Error page. They are very fatal.
Per <https://secure.php.net/manual/en/language.errors.php7.php>,
on PHP 7 this results in a TypeError throwable which will
eventually fatal the request and be reported through
set_exception_handler, or be caught by our top-level 'catch'
and artificially forwarded to our set_exception_handler callback.
On HHVM, these fatal error types are PHP5-like in that they
don't have a throwable object to throw yet, instead the error
meta-data is sent directly as parameeters to set_error_handler,
the same as for warnings. We need to intercept them there so
that they are reported correctly.
Sample from PHP 7:
> MediaWiki\Storage\MutableRevisionRecord::newFromParentRevision( null );
> [no req] TypeError from line 50 of .../MutableRevisionRecord.php:
> Argument 1 passed to ...\MutableRevisionRecord::newFromParentRevision()
> must be an instance of MediaWiki\Storage\RevisionRecord, null given,
> called in /var/www/mediawiki/maintenance/eval.php(78) ...
[exit status: error(255)]
Sample from HHVM:
> MediaWiki\Storage\MutableRevisionRecord::newFromParentRevision( null );
> [hphp] set_error_handler called with:
> ... $type = 4096 // E_RECOVERABLE_ERROR
>
> [hphp] [...] Catchable fatal error:
> Argument 1 passed to ...\MutableRevisionRecord::newFromParentRevision()
> must be an instance of MediaWiki\Storage\RevisionRecord, null given
> ...
[exit status: error(255)]
Interestingly, if you forget to return false from set_error_handler
for fatal errors on HHVM, it can actually continue execution.
Bug: T205677
Change-Id: I18dd2ff37fa2c2679d0c598cbeff0c61c2fe0253
* @var string $reservedMemory
*/
protected static $reservedMemory;
* @var string $reservedMemory
*/
protected static $reservedMemory;
+ * Error types that, if unhandled, are fatal to the request.
+ *
+ * On PHP 7, these error types may be thrown as Error objects, which
+ * implement Throwable (but not Exception).
+ *
+ * On HHVM, these invoke the set_error_handler callback, similar to how
+ * (non-fatal) warnings and notices are reported, except that after this
+ * handler runs for fatal error tpyes, script execution stops!
+ *
+ * The user will be shown an HTTP 500 Internal Server Error.
+ * As such, these should be sent to MediaWiki's "fatal" or "exception"
+ * channel. Normally, the error handler logs them to the "error" channel.
+ *
* @var array $fatalErrorTypes
*/
protected static $fatalErrorTypes = [
* @var array $fatalErrorTypes
*/
protected static $fatalErrorTypes = [
- E_ERROR, E_PARSE, E_CORE_ERROR, E_COMPILE_ERROR, E_USER_ERROR,
- /* HHVM's FATAL_ERROR level */ 16777217,
+ E_ERROR,
+ E_PARSE,
+ E_CORE_ERROR,
+ E_COMPILE_ERROR,
+ E_USER_ERROR,
+
+ // E.g. "Catchable fatal error: Argument X must be Y, null given"
+ E_RECOVERABLE_ERROR,
+
+ // HHVM's FATAL_ERROR constant
+ 16777217,
];
/**
* @var bool $handledFatalCallback
];
/**
* @var bool $handledFatalCallback
// behaviour given the null was not part of the code and is likely not
// accounted for.
switch ( $level ) {
// behaviour given the null was not part of the code and is likely not
// accounted for.
switch ( $level ) {
- case E_RECOVERABLE_ERROR:
- $levelName = 'Error';
- $severity = LogLevel::ERROR;
- break;
case E_WARNING:
case E_CORE_WARNING:
case E_COMPILE_WARNING:
case E_WARNING:
case E_CORE_WARNING:
case E_COMPILE_WARNING:
self::logError( $e, 'error', $severity );
// If $wgPropagateErrors is true return false so PHP shows/logs the error normally.
self::logError( $e, 'error', $severity );
// If $wgPropagateErrors is true return false so PHP shows/logs the error normally.
- // Ignore $wgPropagateErrors if the error should break execution, or track_errors is set
+ // Ignore $wgPropagateErrors if track_errors is set
// (which means someone is counting on regular PHP error handling behavior).
// (which means someone is counting on regular PHP error handling behavior).
- return !( $wgPropagateErrors || $level == E_RECOVERABLE_ERROR || ini_get( 'track_errors' ) );
+ return !( $wgPropagateErrors || ini_get( 'track_errors' ) );