[LLVMbugs] [Bug 19161] New: Analyzer does not realise list is not empty

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19161

            Bug ID: 19161
           Summary: Analyzer does not realise list is not empty
           Product: clang
           Version: 3.3
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: peter at stairways.com.au
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The analyzer (in Xcode 5.1) reports a "Use of memory after it is freed" if you
test for !empty and then access a list.  Perhaps I'm missing something, or
maybe this is just too hard for the analyser?

#include <list>

struct QueueEntry {
    bool writer;
};

static std::list<QueueEntry> i_actionQueue;

int main(int argc, const char * argv[])
{
     while ( !i_actionQueue.empty() && i_actionQueue.begin()->writer ) {
          i_actionQueue.pop_front();
    }

    return 0;
}

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