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1 #!/usr/bin/env python
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2 #===----------------------------------------------------------------------===##
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3 #
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4 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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5 # See https://llvm.org/LICENSE.txt for license information.
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6 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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7 #
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8 #===----------------------------------------------------------------------===##
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9 """
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10 sym_diff - Compare two symbol lists and output the differences.
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11 """
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12
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13 from argparse import ArgumentParser
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14 import sys
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15 from libcxx.sym_check import diff, util
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16
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17
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18 def main():
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19 parser = ArgumentParser(
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20 description='Extract a list of symbols from a shared library.')
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21 parser.add_argument(
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22 '--names-only', dest='names_only',
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23 help='Only print symbol names',
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24 action='store_true', default=False)
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25 parser.add_argument(
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26 '--removed-only', dest='removed_only',
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27 help='Only print removed symbols',
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28 action='store_true', default=False)
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29 parser.add_argument('--only-stdlib-symbols', dest='only_stdlib',
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30 help="Filter all symbols not related to the stdlib",
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31 action='store_true', default=False)
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32 parser.add_argument('--strict', dest='strict',
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33 help="Exit with a non-zero status if any symbols "
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34 "differ",
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35 action='store_true', default=False)
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36 parser.add_argument(
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37 '-o', '--output', dest='output',
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38 help='The output file. stdout is used if not given',
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39 type=str, action='store', default=None)
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40 parser.add_argument(
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41 '--demangle', dest='demangle', action='store_true', default=False)
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42 parser.add_argument(
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43 'old_syms', metavar='old-syms', type=str,
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44 help='The file containing the old symbol list or a library')
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45 parser.add_argument(
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46 'new_syms', metavar='new-syms', type=str,
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47 help='The file containing the new symbol list or a library')
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48 args = parser.parse_args()
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49
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50 old_syms_list = util.extract_or_load(args.old_syms)
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51 new_syms_list = util.extract_or_load(args.new_syms)
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52
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53 if args.only_stdlib:
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54 old_syms_list, _ = util.filter_stdlib_symbols(old_syms_list)
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55 new_syms_list, _ = util.filter_stdlib_symbols(new_syms_list)
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56
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57 added, removed, changed = diff.diff(old_syms_list, new_syms_list)
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58 if args.removed_only:
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59 added = {}
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60 report, is_break, is_different = diff.report_diff(
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61 added, removed, changed, names_only=args.names_only,
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62 demangle=args.demangle)
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63 if args.output is None:
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64 print(report)
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65 else:
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66 with open(args.output, 'w') as f:
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67 f.write(report + '\n')
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68 exit_code = 1 if is_break or (args.strict and is_different) else 0
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69 sys.exit(exit_code)
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70
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71 if __name__ == '__main__':
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72 main()
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