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The reason that I am turning off this optimization is that there is an additional case where a block can escape that has come up. Specifically, this occurs when a block is used in a scope outside of its current scope. This can cause a captured retainable object pointer whose life is preserved by the objc_retainBlock to be deallocated before the block is invoked. An example of the code needed to trigger the bug is: ---- \#import <Foundation/Foundation.h> int main(int argc, const char * argv[]) { void (^somethingToDoLater)(); { NSObject *obj = [NSObject new]; somethingToDoLater = ^{ [obj self]; // Crashes here }; } NSLog(@"test."); somethingToDoLater(); return 0; } ---- In the next commit, I remove all the dead code that results from this. Once I put in the fixing commit I will bring back the tests that I deleted in this commit. rdar://14802782. rdar://14868830. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189869 91177308-0d34-0410-b5e6-96231b3b80d8 |
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.. | ||
ARCRuntimeEntryPoints.h | ||
CMakeLists.txt | ||
DependencyAnalysis.cpp | ||
DependencyAnalysis.h | ||
LLVMBuild.txt | ||
Makefile | ||
ObjCARC.cpp | ||
ObjCARC.h | ||
ObjCARCAliasAnalysis.cpp | ||
ObjCARCAliasAnalysis.h | ||
ObjCARCAPElim.cpp | ||
ObjCARCContract.cpp | ||
ObjCARCExpand.cpp | ||
ObjCARCOpts.cpp | ||
ObjCARCUtil.cpp | ||
ProvenanceAnalysis.cpp | ||
ProvenanceAnalysis.h |