3 Commits

Author	SHA1	Message	Date
Erik Eckstein	2527d3765e	IRGen: fix how metadata is loaded for fast class casting ... Pass the correct type to `emitHeapMetadataRefForHeapObject()`. Fixes a runtime crash in case a class protocol is cast to a final swift class, where the actual object is an ObjectiveC class instance. rdar://99626888	2022-09-22 08:46:18 +02:00
Slava Pestov	c80d8e6b1c	IRGen: Exclude classes defined in generic contexts from fast cast optimization ... This is a regression from https://github.com/apple/swift/pull/41784. Fixes rdar://problem/93822961.	2022-07-12 04:11:32 -04:00
Erik Eckstein	860078a79a	IRGen: fast casting to final classes ... When casting a class instance to a final class, we can directly compare the isa-pointer with address of the metadata. This avoids a call to `swift_dynamicCastClass`. It also avoids a call to the metadata accessor of the class (which calls `swift_getInitializedObjCClass`). For comparing the metadata pointers it's not required that the metadata is fully initialized.	2022-04-07 16:36:21 +02:00