test/test_dwarf_v5_forms.py

   1 # The dwarf_v5_forms.debug file was generated as follows, using gcc 11.2.0 on
   2 # an x86_64 machine.
   3 # $ cat dwarf_v5_forms.c
   4 # int main();
   5 # {
   6 #         char ** val;
   7 #         return 0;
   8 # }
   9 # $ gcc -O0 -gdwarf-5 dwarf_v5_forms.c -o dwarf_v5_forms.debug
  10 # $ strip --only-keep-debug dwarf_v5_forms.debug
  11 import unittest
  12 import os
  13
  14
  15 from elftools.elf.elffile import ELFFile
  16
  17 class TestDWARFV5_forms(unittest.TestCase):
  18
  19     def test_DW_FORM_implicit_const(self):
  20         path = os.path.join('test', 'testfiles_for_unittests',
  21                             'dwarf_v5_forms.debug')
  22         with open(path, 'rb') as f:
  23             elffile = ELFFile(f)
  24             dwarfinfo = elffile.get_dwarf_info()
  25             # File is very small, so load all DIEs.
  26             dies = []
  27             for cu in dwarfinfo.iter_CUs():
  28                 dies.extend(cu.iter_DIEs())
  29             # Locate the "var" DIE.
  30             for die in dies:
  31                 # There should be only one
  32                 if (die.tag == "DW_TAG_variable" and
  33                     die.attributes["DW_AT_name"].value == b'val'):
  34                         # In the dwarfinfo, it's type is sized using a
  35                         # DW_FORM_implicit_const: check it is parsed correctly
  36                         break
  37             dietype = cu.get_DIE_from_refaddr(die.attributes["DW_AT_type"].value)
  38             byte_size_attr = dietype.attributes["DW_AT_byte_size"]
  39             self.assertEqual(byte_size_attr.form, "DW_FORM_implicit_const")
  40             self.assertEqual(byte_size_attr.value, 8)
  41
  42     def test_DW_FORM_linestrp(self):
  43         path = os.path.join('test', 'testfiles_for_unittests',
  44                             'dwarf_v5_forms.debug')
  45         with open(path, 'rb') as f:
  46             elffile = ELFFile(f)
  47             dwarfinfo = elffile.get_dwarf_info()
  48             cu = next(dwarfinfo.iter_CUs())
  49             top_die = cu.get_top_DIE()
  50             name_attr = top_die.attributes["DW_AT_name"]
  51             self.assertEqual(name_attr.form, "DW_FORM_line_strp")
  52             self.assertEqual(name_attr.value, b"dwarf_v5_forms.c")