106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
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#!/usr/bin/env python
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from __future__ import absolute_import, division, print_function
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import argparse
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import difflib
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import filecmp
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import os
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import subprocess
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import sys
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disassembler = 'objdump'
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def keep_line(line):
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"""Returns true for lines that should be compared in the disassembly
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output."""
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return "file format" not in line
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def disassemble(objfile):
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"""Disassemble object to a file."""
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p = subprocess.Popen([disassembler, '-d', objfile],
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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(out, err) = p.communicate()
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if p.returncode or err:
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print("Disassemble failed: {}".format(objfile))
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sys.exit(1)
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return [line for line in out.split(os.linesep) if keep_line(line)]
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def dump_debug(objfile):
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"""Dump all of the debug info from a file."""
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p = subprocess.Popen([disassembler, '-WliaprmfsoRt', objfile], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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(out, err) = p.communicate()
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if p.returncode or err:
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print("Dump debug failed: {}".format(objfile))
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sys.exit(1)
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return [line for line in out.split(os.linesep) if keep_line(line)]
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def first_diff(a, b, fromfile, tofile):
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"""Returns the first few lines of a difference, if there is one. Python
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diff can be very slow with large objects and the most interesting changes
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are the first ones. Truncate data before sending to difflib. Returns None
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is there is no difference."""
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# Find first diff
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first_diff_idx = None
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for idx, val in enumerate(a):
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if val != b[idx]:
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first_diff_idx = idx
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break
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if first_diff_idx == None:
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# No difference
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return None
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# Diff to first line of diff plus some lines
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context = 3
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diff = difflib.unified_diff(a[:first_diff_idx+context],
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b[:first_diff_idx+context],
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fromfile,
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tofile)
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difference = "\n".join(diff)
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if first_diff_idx + context < len(a):
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difference += "\n*** Diff truncated ***"
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return difference
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def compare_object_files(objfilea, objfileb):
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"""Compare disassembly of two different files.
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Allowing unavoidable differences, such as filenames.
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Return the first difference if the disassembly differs, or None.
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"""
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disa = disassemble(objfilea)
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disb = disassemble(objfileb)
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return first_diff(disa, disb, objfilea, objfileb)
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def compare_debug_info(objfilea, objfileb):
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"""Compare debug info of two different files.
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Allowing unavoidable differences, such as filenames.
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Return the first difference if the debug info differs, or None.
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If there are differences in the code, there will almost certainly be differences in the debug info too.
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"""
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dbga = dump_debug(objfilea)
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dbgb = dump_debug(objfileb)
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return first_diff(dbga, dbgb, objfilea, objfileb)
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def compare_exact(objfilea, objfileb):
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"""Byte for byte comparison between object files.
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Returns True if equal, False otherwise.
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"""
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return filecmp.cmp(objfilea, objfileb)
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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parser.add_argument('objfilea', nargs=1)
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parser.add_argument('objfileb', nargs=1)
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parser.add_argument('-v', '--verbose', action='store_true')
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args = parser.parse_args()
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diff = compare_object_files(args.objfilea[0], args.objfileb[0])
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if diff:
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print("Difference detected")
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if args.verbose:
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print(diff)
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sys.exit(1)
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else:
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print("The same")
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