Error trying to obtain dwarf info: 'structs' is not defined

[crobertob]

Hello,
I'm trying to run the example examine_dwarf_info in an ELF file from Microvision but I receive the following error, could you please tell me if I'm doing something wrong or if there is a way to fix it? The example runs properly with the elf file provided as example. I'm using Python 2.7.3. Thank you.

Processing file: uvision/O0/obj/UserManualExample.axf
  Found a compile unit at offset 0, length 15044
Traceback (most recent call last):
  File "examine_dwarf_info.py", line 50, in <module>
    process_file(filename)
  File "examine_dwarf_info.py", line 42, in process_file
    top_DIE = CU.get_top_DIE()
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/compileunit.py", line 76, in get_top_DIE
    return self._get_DIE(0)
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/compileunit.py", line 95, in _get_DIE
    self._parse_DIEs()
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/compileunit.py", line 119, in _parse_DIEs
    offset=die_offset)
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/die.py", line 90, in __init__
    self._parse_DIE()
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/die.py", line 185, in _parse_DIE
    value = self._translate_attr_value(form, raw_value)
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/die.py", line 207, in _translate_attr_value
    structs.Dwarf_dw_form[form], self.stream)
NameError: global name 'structs' is not defined

[smani]

This problem also happens with the ELF files generated by armcc/armlink tools. In _translate_attr_value, the local "structs" variable isn't initialized. I introduced "structs = self.cu.structs" and it didn't help either.

[eliben]

Thanks for spotting and reporting the error. I've pushed a fix that should help, but you could you please (both @crobertob and @smani) post the smallest input files you ran into this problem with? This way I can add them to the tests. I don't appear to have any files that trigger the DW_FORM_indirect path now.

[crobertob]

Thank you very much, you can find the input file here:
https://www.dropbox.com/s/hqghlq53h9imvzp/UserManualExample.axf

I will try out the fix now. Have a nice day!

[crobertob]

After trying it out, I get a new error:

Processing file: O0/obj/UserManualExample.axf
  Found a compile unit at offset 0, length 15044
Traceback (most recent call last):
  File "examine_dwarf_info.py", line 50, in <module>
    process_file(filename)
  File "examine_dwarf_info.py", line 42, in process_file
    top_DIE = CU.get_top_DIE()
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/compileunit.py", line 76                                                                                                                                                 , in get_top_DIE
    return self._get_DIE(0)
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/compileunit.py", line 95                                                                                                                                                 , in _get_DIE
    self._parse_DIEs()
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/compileunit.py", line 11                                                                                                                                                 9, in _parse_DIEs
    offset=die_offset)
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/die.py", line 90, in __i                                                                                                                                                 nit__
    self._parse_DIE()
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/die.py", line 185, in _p                                                                                                                                                 arse_DIE
    value = self._translate_attr_value(form, raw_value)
  File "/usr/lib/python2.7/site-packages/elftools/dwarf/die.py", line 207, in _t                                                                                                                                                 ranslate_attr_value
    self.cu.structs.Dwarf_dw_form[form], self.stream)
KeyError: 17

Not sure what is the problem now.

[smani]

Don't have a personal license to generate the ELF image from armcc/armlink. Sorry I couldn't provide a image. I can confirm that I also see the behavior like @crobertob.

[eliben]

Thanks for the reproducing file. I think I got the problem fixed in trunk. Let me know how it works for you.

[smani]

Thanks for the fix. It works for me.

[crobertob]

Thank you very much for the fix.