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
12 # If pyelftools is not installed, the example can also run from the root or
13 # examples/ dir of the source distribution.
14 sys
.path
[0:0] = ['.', '..']
16 from elftools
.common
.py3compat
import bytes2str
17 from elftools
.elf
.elffile
import ELFFile
20 def process_file(filename
):
21 print('Processing file:', filename
)
22 with
open(filename
, 'rb') as f
:
25 if not elffile
.has_dwarf_info():
26 print(' file has no DWARF info')
29 # get_dwarf_info returns a DWARFInfo context object, which is the
30 # starting point for all DWARF-based processing in pyelftools.
31 dwarfinfo
= elffile
.get_dwarf_info()
33 for CU
in dwarfinfo
.iter_CUs():
34 # DWARFInfo allows to iterate over the compile units contained in
35 # the .debug_info section. CU is a CompileUnit object, with some
36 # computed attributes (such as its offset in the section) and
37 # a header which conforms to the DWARF standard. The access to
38 # header elements is, as usual, via item-lookup.
39 print(' Found a compile unit at offset %s, length %s' % (
40 CU
.cu_offset
, CU
['unit_length']))
42 # The first DIE in each compile unit describes it.
43 top_DIE
= CU
.get_top_DIE()
44 print(' Top DIE with tag=%s' % top_DIE
.tag
)
46 # Each DIE holds an OrderedDict of attributes, mapping names to
47 # values. Values are represented by AttributeValue objects in
48 # elftools/dwarf/die.py
49 # We're interested in the DW_AT_name attribute. Note that its value
50 # is usually a string taken from the .debug_str section. This
51 # is done transparently by the library, and such a value will be
52 # simply given as a string.
53 name_attr
= top_DIE
.attributes
['DW_AT_name']
54 print(' name=%s' % bytes2str(name_attr
.value
))
56 if __name__
== '__main__':
57 for filename
in sys
.argv
[1:]:
58 process_file(filename
)