[llvm-bugs] [Bug 39402] New: Don't crash when using -a on non-archives

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39402

            Bug ID: 39402
           Summary: Don't crash when using -a on non-archives
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-objdump
          Assignee: unassignedbugs at nondot.org
          Reporter: jh7370.2008 at my.bristol.ac.uk
                CC: llvm-bugs at lists.llvm.org

-a prints archive headers. It should probably emit a warning/error and not do
anything when specified for a regular object file. However, it instead crashes,
because it attempts to dereference a null pointer:

static void DumpObject(ObjectFile *o, const Archive *a = nullptr,
                       const Archive::Child *c = nullptr) {
...
  if (ArchiveHeaders && !MachOOpt)
    printArchiveChild(a->getFileName(), *c); // a will be null here
...
}

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