diff options
Diffstat (limited to 'deps/v8/build/toolchain/gcc_solink_wrapper.py')
-rwxr-xr-x | deps/v8/build/toolchain/gcc_solink_wrapper.py | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/deps/v8/build/toolchain/gcc_solink_wrapper.py b/deps/v8/build/toolchain/gcc_solink_wrapper.py new file mode 100755 index 0000000000..cb1c02d24e --- /dev/null +++ b/deps/v8/build/toolchain/gcc_solink_wrapper.py @@ -0,0 +1,123 @@ +#!/usr/bin/env python +# Copyright 2015 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. + +"""Runs 'ld -shared' and generates a .TOC file that's untouched when unchanged. + +This script exists to avoid using complex shell commands in +gcc_toolchain.gni's tool("solink"), in case the host running the compiler +does not have a POSIX-like shell (e.g. Windows). +""" + +import argparse +import os +import subprocess +import sys + +import wrapper_utils + + +def CollectSONAME(args): + """Replaces: readelf -d $sofile | grep SONAME""" + toc = '' + readelf = subprocess.Popen(wrapper_utils.CommandToRun( + [args.readelf, '-d', args.sofile]), stdout=subprocess.PIPE, bufsize=-1) + for line in readelf.stdout: + if 'SONAME' in line: + toc += line + return readelf.wait(), toc + + +def CollectDynSym(args): + """Replaces: nm --format=posix -g -D $sofile | cut -f1-2 -d' '""" + toc = '' + nm = subprocess.Popen(wrapper_utils.CommandToRun([ + args.nm, '--format=posix', '-g', '-D', args.sofile]), + stdout=subprocess.PIPE, bufsize=-1) + for line in nm.stdout: + toc += ' '.join(line.split(' ', 2)[:2]) + '\n' + return nm.wait(), toc + + +def CollectTOC(args): + result, toc = CollectSONAME(args) + if result == 0: + result, dynsym = CollectDynSym(args) + toc += dynsym + return result, toc + + +def UpdateTOC(tocfile, toc): + if os.path.exists(tocfile): + old_toc = open(tocfile, 'r').read() + else: + old_toc = None + if toc != old_toc: + open(tocfile, 'w').write(toc) + + +def main(): + parser = argparse.ArgumentParser(description=__doc__) + parser.add_argument('--readelf', + required=True, + help='The readelf binary to run', + metavar='PATH') + parser.add_argument('--nm', + required=True, + help='The nm binary to run', + metavar='PATH') + parser.add_argument('--strip', + help='The strip binary to run', + metavar='PATH') + parser.add_argument('--sofile', + required=True, + help='Shared object file produced by linking command', + metavar='FILE') + parser.add_argument('--tocfile', + required=True, + help='Output table-of-contents file', + metavar='FILE') + parser.add_argument('--map-file', + help=('Use --Wl,-Map to generate a map file. Will be ' + 'gzipped if extension ends with .gz'), + metavar='FILE') + parser.add_argument('--output', + required=True, + help='Final output shared object file', + metavar='FILE') + parser.add_argument('command', nargs='+', + help='Linking command') + args = parser.parse_args() + + # Work-around for gold being slow-by-default. http://crbug.com/632230 + fast_env = dict(os.environ) + fast_env['LC_ALL'] = 'C' + + # First, run the actual link. + command = wrapper_utils.CommandToRun(args.command) + result = wrapper_utils.RunLinkWithOptionalMapFile(command, env=fast_env, + map_file=args.map_file) + + if result != 0: + return result + + # Next, generate the contents of the TOC file. + result, toc = CollectTOC(args) + if result != 0: + return result + + # If there is an existing TOC file with identical contents, leave it alone. + # Otherwise, write out the TOC file. + UpdateTOC(args.tocfile, toc) + + # Finally, strip the linked shared object file (if desired). + if args.strip: + result = subprocess.call(wrapper_utils.CommandToRun( + [args.strip, '-o', args.output, args.sofile])) + + return result + + +if __name__ == "__main__": + sys.exit(main()) |