[llvm-bugs] [Bug 41905] New: Add warning messages if disassembly + source for problematic inputs

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41905

            Bug ID: 41905
           Summary: Add warning messages if disassembly + source for
                    problematic inputs
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          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

This would be an improvement beyond what GNU objdump does. --disassemble +
--source should result in the source information for a given function to be
printed inpline with the disassembly. However, under some circumstances it is
not possible for the source to be loaded. Three examples I can think of are:

1) The module is missing debug information.
2) The source file could not be found.
3) The debug information points at a line beyond the end of the file,
potentially implying that the wrong file has been found.

It would be nice if we emitted warnings for each of these cases. This would
help users who are confused why the source is not appearing.

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