[LLVMbugs] [Bug 5032] New: Bad DWARF encoding in EH frames.

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5032

           Summary: Bad DWARF encoding in EH frames.
           Product: new-bugs
           Version: 2.6
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: miscompilation
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: wilsons at start.ca
                CC: llvmbugs at cs.uiuc.edu, wilsons at start.ca


I am seeing the following exception table header generated on x86_64,
GNU/Linux:

GCC_except_table1:
        .byte   0x0           # Padding
        .byte   0x0           # Padding
.Lexception1:
        .byte   0xFF          # @LPStart format (DW_EH_PE_omit)
        .byte   0             # @TType format (DW_EH_PE_absptr)
        .uleb128  5           # @TType base offset

Now, @TType format says to expect an absptr, but what follows is a uleb128.

I am _not_ an expert on DWARF.  But I think this is wrong.  Shouldn't @TType
format be DW_EH_PE_uleb128?  Otherwise a dwarf reader would take @TType offset
as an absoulte pointer address.


Thanks,
Steve


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