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# The dwarf_v5_forms.debug file was generated as follows, using gcc 11.2.0 on
# an x86_64 machine.
# $ cat dwarf_v5_forms.c
# int main();
# {
# char ** val;
# return 0;
# }
# $ gcc -O0 -gdwarf-5 dwarf_v5_forms.c -o dwarf_v5_forms.debug
# $ strip --only-keep-debug dwarf_v5_forms.debug
import unittest
import os
from elftools.elf.elffile import ELFFile
class TestDWARFV5_forms(unittest.TestCase):
def test_DW_FORM_implicit_const(self):
path = os.path.join('test', 'testfiles_for_unittests',
'dwarf_v5_forms.debug')
with open(path, 'rb') as f:
elffile = ELFFile(f)
dwarfinfo = elffile.get_dwarf_info()
# File is very small, so load all DIEs.
dies = []
for cu in dwarfinfo.iter_CUs():
dies.extend(cu.iter_DIEs())
# Locate the "var" DIE.
for die in dies:
# There should be only one
if (die.tag == "DW_TAG_variable" and
die.attributes["DW_AT_name"].value == b'val'):
# In the dwarfinfo, it's type is sized using a
# DW_FORM_implicit_const: check it is parsed correctly
break
dietype = cu.get_DIE_from_refaddr(die.attributes["DW_AT_type"].value)
byte_size_attr = dietype.attributes["DW_AT_byte_size"]
self.assertEqual(byte_size_attr.form, "DW_FORM_implicit_const")
self.assertEqual(byte_size_attr.value, 8)
def test_DW_FORM_linestrp(self):
path = os.path.join('test', 'testfiles_for_unittests',
'dwarf_v5_forms.debug')
with open(path, 'rb') as f:
elffile = ELFFile(f)
dwarfinfo = elffile.get_dwarf_info()
cu = next(dwarfinfo.iter_CUs())
top_die = cu.get_top_DIE()
name_attr = top_die.attributes["DW_AT_name"]
self.assertEqual(name_attr.form, "DW_FORM_line_strp")
self.assertEqual(name_attr.value, b"dwarf_v5_forms.c")
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