author Mason Chang <>
Tue, 15 Aug 2017 15:32:21 -0700
changeset 375018 2241628188e42f3d716132e2388aa60f054bdf31
parent 326978 1f85e7bfe97d54892bc08f3d5a80e9bab52f0189
permissions -rwxr-xr-x
Bug 1390002 There are some paths to find out if dwrite is enabled, which inits gfxPlatform, which requires information from PopulateScreenInfo, which depends on the refresh driver existing. At this time however, we haven't initialized our vsync source so we crash. This moves vsync initialization earlier in the gfx pipeline. r=kats

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at

# The beginning of this script is both valid shell and valid python,
# such that the script starts with the shell and is reexecuted with
# the right python.
'''which' python2.7 > /dev/null && exec python2.7 "$0" "$@" || exec python "$0" "$@"

from __future__ import print_function, unicode_literals

import os
import sys

def ancestors(path):
    while path:
        yield path
        (path, child) = os.path.split(path)
        if child == "":

def load_mach(dir_path, mach_path):
    import imp
    with open(mach_path, 'r') as fh:
        imp.load_module('mach_bootstrap', fh, mach_path,
                        ('.py', 'r', imp.PY_SOURCE))
    import mach_bootstrap
    return mach_bootstrap.bootstrap(dir_path)

def check_and_get_mach(dir_path):
    bootstrap_paths = (
        # test package bootstrap
    for bootstrap_path in bootstrap_paths:
        mach_path = os.path.join(dir_path, bootstrap_path)
        if os.path.isfile(mach_path):
            return load_mach(dir_path, mach_path)
    return None

def get_mach():
    # Check whether the current directory is within a mach src or obj dir.
    for dir_path in ancestors(os.getcwd()):
        # If we find a "config.status" and "mozinfo.json" file, we are in the objdir.
        config_status_path = os.path.join(dir_path, 'config.status')
        mozinfo_path = os.path.join(dir_path, 'mozinfo.json')
        if os.path.isfile(config_status_path) and os.path.isfile(mozinfo_path):
            import json
            info = json.load(open(mozinfo_path))
            if 'mozconfig' in info and 'MOZCONFIG' not in os.environ:
                # If the MOZCONFIG environment variable is not already set, set it
                # to the value from mozinfo.json.  This will tell the build system
                # to look for a config file at the path in $MOZCONFIG rather than
                # its default locations.
                # Note: subprocess requires native strings in os.environ on Windows
                os.environ[b'MOZCONFIG'] = str(info['mozconfig'])

            if 'topsrcdir' in info:
                # Continue searching for mach_bootstrap in the source directory.
                dir_path = info['topsrcdir']

        mach = check_and_get_mach(dir_path)
        if mach:
            return mach

    # If we didn't find a source path by scanning for a mozinfo.json, check
    # whether the directory containing this script is a source directory. We
    # follow symlinks so mach can be run even if cwd is outside the srcdir.
    return check_and_get_mach(os.path.dirname(os.path.realpath(__file__)))

def main(args):
    mach = get_mach()
    if not mach:
        print('Could not run mach: No mach source directory found.')

if __name__ == '__main__':