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136 lines
4.9 KiB
Python
136 lines
4.9 KiB
Python
# Copyright 2017 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Logic for diffing two SizeInfo objects."""
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import collections
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import logging
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import re
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import models
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_STRIP_NUMBER_SUFFIX_PATTERN = re.compile(r'[.0-9]+$')
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_NORMALIZE_STAR_SYMBOLS_PATTERN = re.compile(r'\s+\d+( \(.*\))?$')
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def _ExactMatchKey(s):
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# Remove numbers and periods for symbols defined by macros that use __line__
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# in names, or for linker symbols like ".L.ref.tmp.2".
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name = _STRIP_NUMBER_SUFFIX_PATTERN.sub('', s.full_name)
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# Use section rather than section_name since clang & gcc use
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# .data.rel.ro vs. .data.rel.ro.local.
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return s.section, name, s.object_path, s.size_without_padding
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def _GoodMatchKey(symbol):
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"""Returns a tuple that can be used to see if two Symbol are the same.
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Keys are not guaranteed to be unique within a SymbolGroup. When multiple
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symbols have the same key, they will be matched up in order of appearance.
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We do this because the numbering of these generated symbols is not stable.
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Examples of symbols with shared keys:
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"** merge strings"
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"** symbol gap 3", "** symbol gap 5 (end of section)"
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"foo() [clone ##]"
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"CSWTCH.61", "CSWTCH.62"
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".L.ref.tmp.2", ".L.ref.tmp"
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"._468", "._467"
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".L__unnamed_1193", ".L__unnamed_712"
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"""
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if symbol.IsPak():
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# full_name looks like "about_ui_resources.grdp: IDR_ABOUT_UI_CREDITS_HTML".
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# name is just "IDR_ABOUT_UI_CREDITS_HTML".
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name = symbol.name
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else:
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name = _STRIP_NUMBER_SUFFIX_PATTERN.sub('', symbol.full_name)
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clone_idx = name.find(' [clone ')
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if clone_idx != -1:
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name = name[:clone_idx]
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if name.startswith('*'):
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# "symbol gap 3 (bar)" -> "symbol gaps"
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name = _NORMALIZE_STAR_SYMBOLS_PATTERN.sub('s', name)
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return symbol.section, symbol.object_path, name
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def _PoorMatchKey(symbol):
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section, _, name = _GoodMatchKey(symbol)
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return section, name
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def _MatchSymbols(before, after, key_func, padding_by_section_name):
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logging.debug('%s: Building symbol index', key_func.__name__)
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before_symbols_by_key = collections.defaultdict(list)
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for s in before:
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before_symbols_by_key[key_func(s)].append(s)
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logging.debug('%s: Creating delta symbols', key_func.__name__)
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unmatched_after = []
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delta_symbols = []
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for after_sym in after:
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before_sym = before_symbols_by_key.get(key_func(after_sym))
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if before_sym:
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before_sym = before_sym.pop(0)
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# Padding tracked in aggregate, except for padding-only symbols.
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if before_sym.size_without_padding != 0:
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padding_by_section_name[before_sym.section_name] += (
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after_sym.padding_pss - before_sym.padding_pss)
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delta_symbols.append(models.DeltaSymbol(before_sym, after_sym))
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else:
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unmatched_after.append(after_sym)
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logging.debug('%s: Matched %d of %d symbols', key_func.__name__,
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len(delta_symbols), len(after))
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unmatched_before = []
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for syms in before_symbols_by_key.itervalues():
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unmatched_before.extend(syms)
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return delta_symbols, unmatched_before, unmatched_after
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def _DiffSymbolGroups(before, after):
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# For changed symbols, padding is zeroed out. In order to not lose the
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# information entirely, store it in aggregate.
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padding_by_section_name = collections.defaultdict(int)
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# Usually >90% of symbols are exact matches, so all of the time is spent in
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# this first pass.
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all_deltas, before, after = _MatchSymbols(
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before, after, _ExactMatchKey, padding_by_section_name)
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for key_func in (_GoodMatchKey, _PoorMatchKey):
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delta_syms, before, after = _MatchSymbols(
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before, after, key_func, padding_by_section_name)
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all_deltas.extend(delta_syms)
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logging.debug('Creating %d unmatched symbols', len(after) + len(before))
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for after_sym in after:
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all_deltas.append(models.DeltaSymbol(None, after_sym))
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for before_sym in before:
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all_deltas.append(models.DeltaSymbol(before_sym, None))
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# Create a DeltaSymbol to represent the zero'd out padding of matched symbols.
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for section_name, padding in padding_by_section_name.iteritems():
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if padding != 0:
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after_sym = models.Symbol(section_name, padding,
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name="** aggregate padding of diff'ed symbols")
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after_sym.padding = padding
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all_deltas.append(models.DeltaSymbol(None, after_sym))
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return models.DeltaSymbolGroup(all_deltas)
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def Diff(before, after):
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"""Diffs two SizeInfo objects. Returns a DeltaSizeInfo."""
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assert isinstance(before, models.SizeInfo)
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assert isinstance(after, models.SizeInfo)
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section_sizes = {k: after.section_sizes.get(k, 0) - v
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for k, v in before.section_sizes.iteritems()}
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for k, v in after.section_sizes.iteritems():
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if k not in section_sizes:
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section_sizes[k] = v
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symbol_diff = _DiffSymbolGroups(before.raw_symbols, after.raw_symbols)
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return models.DeltaSizeInfo(before, after, section_sizes, symbol_diff)
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