[LLVMbugs] [Bug 9995] New: Malformed DWARF from llc?

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon May 23 15:33:50 PDT 2011


           Summary: Malformed DWARF from llc?
           Product: libraries
           Version: 2.9
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: markleone at gmail.com
                CC: llvmbugs at cs.uiuc.edu

It looks like llc might be producing malformed DWARF debug info.  I'm no DWARF
expert, so I'm having trouble diagnosing it.  Here's an example:  compile this
to LLVM IR with "clang -c -g -emit-llvm":

  void bar();
  void foo() { bar(); }    

Then generate an object file via "llc" and "as".  Running "dumpbin" on the
resulting object file (linux elf-64) gives errors like:

  AT of 16359 (0x3fe7) is unknown to dwarfdump. Continuing. 
  dwarfdump ERROR:  dwarf_srclines:  DW_DLE_ATTR_FORM_BAD (114)

There aren't any issues if the object file is generated directly by clang.  But
I need to preserve debug info from LLVM IR through llc (scenario: use clang to
compile library code with debug info, generate additional IR and link it with
library IR, then finish codegen with llc and as).  Thanks in advance for any

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