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1 # Copyright 2014 The Chromium Authors. All rights reserved. | |
2 # Use of this source code is governed by a BSD-style license that can be | |
3 # found in the LICENSE file. | |
4 | |
5 """Common utilities for tools that deal with binary size information. | |
6 | |
7 Copied from chromium/src/build/android/pylib/symbols/binary_size_tools.py. | |
8 """ | |
9 | |
10 import logging | |
11 import re | |
12 | |
13 | |
14 def ParseNm(nm_lines): | |
15 """Parse nm output, returning data for all relevant (to binary size) | |
16 symbols and ignoring the rest. | |
17 | |
18 Args: | |
19 nm_lines: an iterable over lines of nm output. | |
20 | |
21 Yields: | |
22 (symbol name, symbol type, symbol size, source file path). | |
23 | |
24 Path may be None if nm couldn't figure out the source file. | |
25 """ | |
26 | |
27 # Match lines with size, symbol, optional location, optional discriminator | |
28 sym_re = re.compile(r'^[0-9a-f]{8,} ' # address (8+ hex digits) | |
29 '([0-9a-f]{8,}) ' # size (8+ hex digits) | |
30 '(.) ' # symbol type, one character | |
31 '([^\t]+)' # symbol name, separated from next by tab | |
32 '(?:\t(.*):[\d\?]+)?.*$') # location | |
33 # Match lines with addr but no size. | |
34 addr_re = re.compile(r'^[0-9a-f]{8,} (.) ([^\t]+)(?:\t.*)?$') | |
35 # Match lines that don't have an address at all -- typically external symbols. | |
36 noaddr_re = re.compile(r'^ {8,} (.) (.*)$') | |
37 # Match lines with no symbol name, only addr and type | |
38 addr_only_re = re.compile(r'^[0-9a-f]{8,} (.)$') | |
39 | |
40 for line in nm_lines: | |
41 line = line.rstrip() | |
42 match = sym_re.match(line) | |
43 if match: | |
44 size, sym_type, sym = match.groups()[0:3] | |
45 size = int(size, 16) | |
46 if sym_type in ('B', 'b'): | |
47 continue # skip all BSS for now. | |
48 path = match.group(4) | |
49 yield sym, sym_type, size, path | |
50 continue | |
51 match = addr_re.match(line) | |
52 if match: | |
53 # sym_type, sym = match.groups()[0:2] | |
54 continue # No size == we don't care. | |
55 match = noaddr_re.match(line) | |
56 if match: | |
57 sym_type, sym = match.groups() | |
58 if sym_type in ('U', 'w'): | |
59 continue # external or weak symbol | |
60 match = addr_only_re.match(line) | |
61 if match: | |
62 continue # Nothing to do. | |
63 | |
64 | |
65 # If we reach this part of the loop, there was something in the | |
66 # line that we didn't expect or recognize. | |
67 logging.warning('nm output parser failed to parse: %s', repr(line)) | |
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