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