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116 lines
4 KiB
Python
Executable file
116 lines
4 KiB
Python
Executable file
#!/usr/bin/env python
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# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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import logging
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import sys
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from elftools.elf.elffile import ELFFile
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from elftools.dwarf.die import DIE
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from elftools.common.utils import preserve_stream_pos
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def _extract_struct_sizes(die, struct_names_by_size):
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def add(name, size):
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if size not in struct_names_by_size:
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struct_names_by_size[size] = set()
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struct_names_by_size[size].add(name)
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logging.debug('%s => %s Bytes' % (name, size))
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# Handle typedef'd anonymous structs:
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if die.tag == 'DW_TAG_typedef':
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assert(die.attributes['DW_AT_type'].form == 'DW_FORM_ref4')
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offset = die.attributes['DW_AT_type'].value
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ref_die_offset = offset + die.cu.cu_offset
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with preserve_stream_pos(die.stream):
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ref_die = DIE(die.cu, die.stream, ref_die_offset)
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if ref_die.tag == 'DW_TAG_structure_type':
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if 'DW_AT_byte_size' in ref_die.attributes:
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name = die.attributes['DW_AT_name'].value
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size = int(ref_die.attributes['DW_AT_byte_size'].value)
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add(name, size)
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else:
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# Most likely a fwd declaration has been used
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pass
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return
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# Handle named structs:
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if die.tag == 'DW_TAG_structure_type':
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if 'DW_AT_name' in die.attributes and \
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'DW_AT_byte_size' in die.attributes:
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size = int(die.attributes['DW_AT_byte_size'].value)
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name = die.attributes['DW_AT_name'].value
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add(name, size)
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def get_struct_names_by_size(elffile, print_progress=False):
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if not elffile.has_dwarf_info():
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logging.error('File has no DWARF info')
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return None
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dwarfinfo = elffile.get_dwarf_info()
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struct_names_by_size = dict()
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for CU in dwarfinfo.iter_CUs():
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logging.debug('Found a compile unit at offset %s, length %s' % (
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CU.cu_offset, CU['unit_length']))
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if print_progress:
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sys.stdout.write('.')
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sys.stdout.flush()
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def die_info_recurse(die):
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_extract_struct_sizes(die, struct_names_by_size)
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for child in die.iter_children():
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die_info_recurse(child)
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die_info_recurse(CU.get_top_DIE())
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if print_progress:
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sys.stdout.write('\n')
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return struct_names_by_size
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def _process_elf(filename, verbose=False):
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logging.info('Processing .elf file: %s' % filename)
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with open(filename, 'rb') as f:
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elffile = ELFFile(f)
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print_progress = not(verbose)
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struct_names_by_size = get_struct_names_by_size(elffile,
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print_progress)
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for size in sorted(struct_names_by_size.keys(), reverse=True):
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logging.info("%6u bytes: %s", size,
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' '.join(struct_names_by_size[size]))
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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parser.add_argument('-v', '--verbose', action='store_true')
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parser.add_argument('-o', '--logfile',
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help='Log file to output to. Output printed to console '
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'otherwise.')
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parser.add_argument('elf_file',
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help='Extracts all struct sizes from elf file.')
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args = parser.parse_args()
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level = logging.INFO
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if args.verbose:
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level = logging.DEBUG
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logging.basicConfig(level=level, filename=args.logfile)
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_process_elf(args.elf_file, verbose=args.verbose)
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