[LLVMbugs] [Bug 11636] New: Double-release from ARC when inlining C functions

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Dec 21 12:18:44 PST 2011


             Bug #: 11636
           Summary: Double-release from ARC when inlining C functions
           Product: clang
           Version: 3.0
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: paul.q.stevenson at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 7785
  --> http://llvm.org/bugs/attachment.cgi?id=7785
Source file that generates a double release

The attached file generates a double release when compiled with -O2 and
inlining InlineCFunc inside CFunc. The problem can't be reproduced with pure
objc code due to the lack of inlining.

In the example code, when InlineCFunc() returns false, label 20 is taken which
releases the object and then calls the .critedge cleanup code, which also
releases the object. When InlineCFunc() returns true, .critedge is jumped to
directly, resulting in just a single release.

This is about as minimal a reproduction of the original problem as I can manage
- simplifying this example in any way seems to stop the double-release from
being generated.

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