[LLVMbugs] [Bug 19667] New: Win64 binaries are undebuggable due to lack of pdata and xdata unwind info

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19667

            Bug ID: 19667
           Summary: Win64 binaries are undebuggable due to lack of pdata
                    and xdata unwind info
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

windbg, the debugger I usually use, appears to ignore frame pointers when
unwinding for x64.  Instead, it relies on the unwind tables in pdata and xdata.
 When I compile a binary with clang, those aren't present, and I get
nonsensical backtraces.

LLVM has some baseline support for Mingw64-style exceptions, where DWARF
exceptions are layered on top of Win64 exception handling and unwind info, but
we should be emitting win64 unwind info regardless of how we're going to
implement exceptions.  Clang should probably be putting uwtable on its
functions, and we should feed that into MC, similar to what we do on
x86_64-linux.

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