[llvm-bugs] [Bug 25103] New: _cxa_demangle improperly demangles virtual thunks

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https://llvm.org/bugs/show_bug.cgi?id=25103

            Bug ID: 25103
           Summary: _cxa_demangle improperly demangles virtual thunks
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jason.brian.king at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

Attempting to demangle '_ZTv0_n12_NSt9strstreamD0Ev' results in 'non-virtual
thunk to std::strstream::~strstream()'.  However, unless I'm really misreading
the ABI incorrectly, this should be a _virtual_ thunk.

It would appear the culprit is line 4417 of cxa_demangle.cpp -- it should be
looking at first[1], not first[2].

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