301095 2025-10-20 07:40:38 -0700 Implement IPC error string reporting in testing for IPC::Connection 2025-11-04 03:00:29 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 jonbutler webkit-unassigned webkit-bug-importer oldest_to_newest 2152567 0 jonbutler 2025-10-20 07:40:38 -0700 This patch implements the first part of the IPC error string reporting feature, covering both IDL validation and MESSAGE_CHECK failures for IPC::Connection. It introduces: - Error string tracking in the Decoder, and changes to the code generation to set this error string on validation failure - Error string tracking on the Connection, and changes to the MESSAGE_CHECK logic to set the error string on failure - An IPC Testing API method to check for an error string on a specific connection, and a layout test showing its usage and testing the implementation of this feature by calling a test message, IPCTester.CheckTestParameter A few design decisions: - Error messages are checked for directly by WebContent rather than sent back as an out-of-band message from the receiver. This allows WebContent to know when it can continue if there wasn't an error, rather than waiting for a message that may not be coming. - The feature is 100% behind the IPC_TESTING_API feature flag, and only enabled in testing configurations 2152568 1 webkit-bug-importer 2025-10-20 07:40:53 -0700 <rdar://problem/163035367> 2152569 2 jonbutler 2025-10-20 07:45:55 -0700 Pull request: https://github.com/WebKit/WebKit/pull/52656 2156225 3 ews-feeder 2025-11-04 03:00:27 -0800 Committed 302528@main (2837e1eaeb3d): <https://commits.webkit.org/302528@main> Reviewed commits have been landed. Closing PR #52656 and removing active labels.