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