Akira Hatanaka a30499dbf2 [ObjC][ARC] Don't remove autoreleaseRV/retainRV pairs if the call isn't ... a tail call This reapplies the patch in https://reviews.llvm.org/rG1f5b471b8bf4, which was reverted because it was causing crashes. https://bugs.chromium.org/p/chromium/issues/detail?id=1061289#c2 Check that HasSafePathToCall is true before checking the call is a tail call. Original commit message: Previosly ARC optimizer removed the autoreleaseRV/retainRV pair in the following code, which caused the object returned by @something to be placed in the autorelease pool because the call to @something isn't a tail call: ``` %call = call i8* @something(...) %2 = call i8* @objc_retainAutoreleasedReturnValue(i8* %call) %3 = call i8* @objc_autoreleaseReturnValue(i8* %2) ret i8* %3 ``` Fix the bug by checking whether @something is a tail call. rdar://problem/59275894		2020-03-13 13:52:14 -07:00
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ARCRuntimeEntryPoints.h
BlotMapVector.h
CMakeLists.txt
DependencyAnalysis.cpp
DependencyAnalysis.h
LLVMBuild.txt
ObjCARC.cpp
ObjCARC.h
ObjCARCAPElim.cpp
ObjCARCContract.cpp	Revert "[ObjC][ARC] Check the basic block size before calling DominatorTree::dominate"	2020-03-13 11:57:55 -07:00
ObjCARCExpand.cpp
ObjCARCOpts.cpp	[ObjC][ARC] Don't remove autoreleaseRV/retainRV pairs if the call isn't	2020-03-13 13:52:14 -07:00
ProvenanceAnalysis.cpp
ProvenanceAnalysis.h
ProvenanceAnalysisEvaluator.cpp
PtrState.cpp
PtrState.h