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#-------------------------------------------------------------------------------
# elftools example: dwarf_pubnames_types.py
#
# Dump the contents of .debug_pubnames and .debug_pubtypes sections from the
# ELF file.
#
# Note: sample_exe64.elf doesn't have a .debug_pubtypes section.
#
# Vijay Ramasami (rvijayc@gmail.com)
# This code is in the public domain
#-------------------------------------------------------------------------------
from __future__ import print_function
import sys
# If pyelftools is not installed, the example can also run from the root or
# examples/ dir of the source distribution.
sys.path[0:0] = ['.', '..']
from elftools.elf.elffile import ELFFile
from elftools.common.utils import bytes2str
def process_file(filename):
print('Processing file:', filename)
with open(filename, 'rb') as f:
elffile = ELFFile(f)
if not elffile.has_dwarf_info():
print(' file has no DWARF info')
return
# get_dwarf_info returns a DWARFInfo context object, which is the
# starting point for all DWARF-based processing in pyelftools.
dwarfinfo = elffile.get_dwarf_info()
# get .debug_pubtypes section.
pubnames = dwarfinfo.get_pubnames()
if pubnames is None:
print('ERROR: No .debug_pubnames section found in ELF.')
else:
print('%d entries found in .debug_pubnames' % len(pubnames))
print('Trying pubnames example ...')
for name, entry in pubnames.items():
print('%s: cu_ofs = %d, die_ofs = %d' %
(name, entry.cu_ofs, entry.die_ofs))
# get the actual CU/DIE that has this information.
print('Fetching the actual die for %s ...' % name)
for cu in dwarfinfo.iter_CUs():
if cu.cu_offset == entry.cu_ofs:
for die in cu.iter_DIEs():
if die.offset == entry.die_ofs:
print('Die Name: %s' %
bytes2str(die.attributes['DW_AT_name'].value))
# dump all entries in .debug_pubnames section.
print('Dumping .debug_pubnames table ...')
print('-' * 66)
print('%50s%8s%8s' % ('Symbol', 'CU_OFS', 'DIE_OFS'))
print('-' * 66)
for (name, entry) in pubnames.items():
print('%50s%8d%8d' % (name, entry.cu_ofs, entry.die_ofs))
print('-' * 66)
# get .debug_pubtypes section.
pubtypes = dwarfinfo.get_pubtypes()
if pubtypes is None:
print('ERROR: No .debug_pubtypes section found in ELF')
else:
print('%d entries found in .debug_pubtypes' % len(pubtypes))
for name, entry in pubtypes.items():
print('%s: cu_ofs = %d, die_ofs = %d' %
(name, entry.cu_ofs, entry.die_ofs))
# get the actual CU/DIE that has this information.
print('Fetching the actual die for %s ...' % name)
for cu in dwarfinfo.iter_CUs():
if cu.cu_offset == entry.cu_ofs:
for die in cu.iter_DIEs():
if die.offset == entry.die_ofs:
print('Die Name: %s' %
bytes2str(die.attributes['DW_AT_name'].value))
die_info_rec(die)
# dump all entries in .debug_pubtypes section.
print('Dumping .debug_pubtypes table ...')
print('-' * 66)
print('%50s%8s%8s' % ('Symbol', 'CU_OFS', 'DIE_OFS'))
print('-' * 66)
for (name, entry) in pubtypes.items():
print('%50s%8d%8d' % (name, entry.cu_ofs, entry.die_ofs))
print('-' * 66)
def die_info_rec(die, indent_level=' '):
""" A recursive function for showing information about a DIE and its
children.
"""
print(indent_level + 'DIE tag=%s, attrs=' % die.tag)
for name, val in die.attributes.items():
print(indent_level + ' %s = %s' % (name, val))
child_indent = indent_level + ' '
for child in die.iter_children():
die_info_rec(child, child_indent)
if __name__ == '__main__':
if sys.argv[1] == '--test':
process_file(sys.argv[2])
sys.exit(0)
if len(sys.argv) < 2:
print('Expected usage: {0} <executable>'.format(sys.argv[0]))
sys.exit(1)
process_file(sys.argv[1])
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