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)) 68
