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# Copyright (c) 2016 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.
"""Helper functions for gcc_toolchain.gni wrappers."""
import gzip
import os
import re
import subprocess
import shlex
import shutil
import sys
import threading
_BAT_PREFIX = 'cmd /c call '
def _GzipThenDelete(src_path, dest_path):
# Results for Android map file with GCC on a z620:
# Uncompressed: 207MB
# gzip -9: 16.4MB, takes 8.7 seconds.
# gzip -1: 21.8MB, takes 2.0 seconds.
# Piping directly from the linker via -print-map (or via -Map with a fifo)
# adds a whopping 30-45 seconds!
with open(src_path, 'rb') as f_in, gzip.GzipFile(dest_path, 'wb', 1) as f_out:
shutil.copyfileobj(f_in, f_out)
os.unlink(src_path)
def CommandToRun(command):
"""Generates commands compatible with Windows.
When running on a Windows host and using a toolchain whose tools are
actually wrapper scripts (i.e. .bat files on Windows) rather than binary
executables, the |command| to run has to be prefixed with this magic.
The GN toolchain definitions take care of that for when GN/Ninja is
running the tool directly. When that command is passed in to this
script, it appears as a unitary string but needs to be split up so that
just 'cmd' is the actual command given to Python's subprocess module.
Args:
command: List containing the UNIX style |command|.
Returns:
A list containing the Windows version of the |command|.
"""
if command[0].startswith(_BAT_PREFIX):
command = command[0].split(None, 3) + command[1:]
return command
def RunLinkWithOptionalMapFile(command, env=None, map_file=None):
"""Runs the given command, adding in -Wl,-Map when |map_file| is given.
Also takes care of gzipping when |map_file| ends with .gz.
Args:
command: List of arguments comprising the command.
env: Environment variables.
map_file: Path to output map_file.
Returns:
The exit code of running |command|.
"""
tmp_map_path = None
if map_file and map_file.endswith('.gz'):
tmp_map_path = map_file + '.tmp'
command.append('-Wl,-Map,' + tmp_map_path)
elif map_file:
command.append('-Wl,-Map,' + map_file)
result = subprocess.call(command, env=env)
if tmp_map_path and result == 0:
threading.Thread(
target=lambda: _GzipThenDelete(tmp_map_path, map_file)).start()
elif tmp_map_path and os.path.exists(tmp_map_path):
os.unlink(tmp_map_path)
return result
def CaptureCommandStderr(command, env=None):
"""Returns the stderr of a command.
Args:
command: A list containing the command and arguments.
env: Environment variables for the new process.
"""
child = subprocess.Popen(command, stderr=subprocess.PIPE, env=env)
_, stderr = child.communicate()
return child.returncode, stderr
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