http://llvm.org/bugs/show_bug.cgi?id=13635
Bug #: 13635
Summary: Block (NSError **)error return in ARC crashes due to
zombie object
Product: clang
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 9069
--> http://llvm.org/bugs/attachment.cgi?id=9069
Sample code
Details:
-processArray:error: would have been problematic with manual
retain/release code, since localError is a zombie by the time it
is assigned to *error. This method actually works fine when ARC is
enabled, which is great.
-buggyArcProcessArray:error: fails under ARC though. The value
assigned to *error is autoreleased, and deallocated, before
returning to the caller.
Since we tend to think less about references when building with
ARC, it would be great if this could be made to just work.
However, if it cannot, it would be nice if the compiler could
issue a warning that assigning to *error inside the block is a bad
idea, and suggest using the __block local to keep a reference to
the object alive.
Compiler version:
% xcrun clang -v
Apple clang version 4.0 (tags/Apple/clang-421.10.60) (based on LLVM
3.1svn)
Target: x86_64-apple-darwin12.0.0
Thread model: posix
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