1 #-------------------------------------------------------------------------------
2 # elftools example: examine_dwarf_info.py
4 # An example of examining information in the .debug_info section of an ELF file.
6 # Eli Bendersky (eliben@gmail.com)
7 # This code is in the public domain
8 #-------------------------------------------------------------------------------
9 from __future__
import print_function
11 from elftools
.elf
.elffile
import ELFFile
14 def process_file(filename
):
15 print('Processing file:', filename
)
16 with
open(filename
) as f
:
19 if not elffile
.has_dwarf_info():
20 print(' file has no DWARF info')
23 # get_dwarf_info returns a DWARFInfo context object, which is the
24 # starting point for all DWARF-based processing in pyelftools.
25 dwarfinfo
= elffile
.get_dwarf_info()
27 for CU
in dwarfinfo
.iter_CUs():
28 # DWARFInfo allows to iterate over the compile units contained in
29 # the .debug_info section. CU is a CompileUnit object, with some
30 # computed attributes (such as its offset in the section) and
31 # a header which conforms to the DWARF standard. The access to
32 # header elements is, as usual, via item-lookup.
33 print(' Found a compile unit at offset %s, length %s' % (
34 CU
.cu_offset
, CU
['unit_length']))
36 # The first DIE in each compile unit describes it.
37 top_DIE
= CU
.get_top_DIE()
38 print(' Top DIE with tag=%s' % top_DIE
.tag
)
40 # Each DIE holds an OrderedDict of attributes, mapping names to
41 # values. Values are represented by AttributeValue objects in
42 # elftools/dwarf/die.py
43 # We're interested in the DW_AT_name attribute. Note that its value
44 # is usually a string taken from the .debug_str section. This
45 # is done transparently by the library, and such a value will be
46 # simply given as a string.
47 name_attr
= top_DIE
.attributes
['DW_AT_name']
48 print(' name=%s' % name_attr
.value
)
50 if __name__
== '__main__':
51 for filename
in sys
.argv
[1:]:
52 process_file(filename
)