172 lines
4.7 KiB
Python
172 lines
4.7 KiB
Python
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#!/usr/bin/env python
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# Copyright (c) 2011 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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"""Prints a report of symbols stripped by the linker due to being unused.
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To use, build with these linker flags:
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-Wl,--gc-sections
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-Wl,--print-gc-sections
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the first one is the default in Release; search build/common.gypi for it
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and to see where to add the other.
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Then build, saving the output into a file:
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make chrome 2>&1 | tee buildlog
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and run this script on it:
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./tools/unused-symbols-report.py buildlog > report.html
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"""
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import cgi
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import optparse
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import os
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import re
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import subprocess
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import sys
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cppfilt_proc = None
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def Demangle(sym):
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"""Demangle a C++ symbol by passing it through c++filt."""
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global cppfilt_proc
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if cppfilt_proc is None:
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cppfilt_proc = subprocess.Popen(['c++filt'], stdin=subprocess.PIPE,
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stdout=subprocess.PIPE)
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print >>cppfilt_proc.stdin, sym
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return cppfilt_proc.stdout.readline().strip()
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def Unyuck(sym):
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"""Attempt to prettify a C++ symbol by some basic heuristics."""
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sym = sym.replace('std::basic_string<char, std::char_traits<char>, '
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'std::allocator<char> >', 'std::string')
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sym = sym.replace('std::basic_string<wchar_t, std::char_traits<wchar_t>, '
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'std::allocator<wchar_t> >', 'std::wstring')
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sym = sym.replace('std::basic_string<unsigned short, '
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'base::string16_char_traits, '
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'std::allocator<unsigned short> >', 'string16')
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sym = re.sub(r', std::allocator<\S+\s+>', '', sym)
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return sym
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def Parse(input, skip_paths=None, only_paths=None):
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"""Parse the --print-gc-sections build output.
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Args:
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input: iterable over the lines of the build output
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Yields:
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(target name, path to .o file, demangled symbol)
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"""
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symbol_re = re.compile(r"'\.text\.(\S+)' in file '(\S+)'$")
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path_re = re.compile(r"^out/[^/]+/[^/]+/([^/]+)/(.*)$")
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for line in input:
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match = symbol_re.search(line)
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if not match:
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continue
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symbol, path = match.groups()
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symbol = Unyuck(Demangle(symbol))
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path = os.path.normpath(path)
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if skip_paths and skip_paths in path:
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continue
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if only_paths and only_paths not in path:
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continue
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match = path_re.match(path)
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if not match:
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print >>sys.stderr, "Skipping weird path", path
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continue
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target, path = match.groups()
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yield target, path, symbol
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# HTML header for our output page.
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TEMPLATE_HEADER = """<!DOCTYPE html>
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<head>
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<style>
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body {
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font-family: sans-serif;
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font-size: 0.8em;
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}
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h1, h2 {
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font-weight: normal;
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margin: 0.5em 0;
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}
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h2 {
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margin-top: 1em;
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}
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tr:hover {
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background: #eee;
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}
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.permalink {
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padding-left: 1ex;
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font-size: 80%;
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text-decoration: none;
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color: #ccc;
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}
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.symbol {
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font-family: WebKitWorkAround, monospace;
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margin-left: 4ex;
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text-indent: -4ex;
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padding: 0.5ex 1ex;
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}
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.file {
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padding: 0.5ex 1ex;
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padding-left: 2ex;
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font-family: WebKitWorkAround, monospace;
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font-size: 90%;
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color: #777;
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}
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</style>
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</head>
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<body>
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<h1>chrome symbols deleted at link time</h1>
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"""
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def Output(iter):
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"""Print HTML given an iterable of (target, path, symbol) tuples."""
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targets = {}
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for target, path, symbol in iter:
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entries = targets.setdefault(target, [])
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entries.append((symbol, path))
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print TEMPLATE_HEADER
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print "<p>jump to target:"
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print "<select onchange='document.location.hash = this.value'>"
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for target in sorted(targets.keys()):
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print "<option>%s</option>" % target
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print "</select></p>"
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for target in sorted(targets.keys()):
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print "<h2>%s" % target
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print "<a class=permalink href='#%s' name='%s'>#</a>" % (target, target)
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print "</h2>"
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print "<table width=100% cellspacing=0>"
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for symbol, path in sorted(targets[target]):
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htmlsymbol = cgi.escape(symbol).replace('::', '::<wbr>')
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print "<tr><td><div class=symbol>%s</div></td>" % htmlsymbol
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print "<td valign=top><div class=file>%s</div></td></tr>" % path
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print "</table>"
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def main():
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parser = optparse.OptionParser(usage='%prog [options] buildoutput\n\n' +
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__doc__)
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parser.add_option("--skip-paths", metavar="STR", default="third_party",
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help="skip paths matching STR [default=%default]")
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parser.add_option("--only-paths", metavar="STR",
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help="only include paths matching STR [default=%default]")
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opts, args = parser.parse_args()
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if len(args) < 1:
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parser.print_help()
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sys.exit(1)
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iter = Parse(open(args[0]),
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skip_paths=opts.skip_paths,
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only_paths=opts.only_paths)
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Output(iter)
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if __name__ == '__main__':
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main()
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