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1# Copyright 2016 The Chromium Authors
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5
6import contextlib
7import os
8import sys
9
10from pylib import constants
11
12DIR_SOURCE_ROOT = os.environ.get(
13    'CHECKOUT_SOURCE_ROOT',
14    os.path.abspath(os.path.join(os.path.dirname(__file__),
15                                 os.pardir, os.pardir, os.pardir, os.pardir)))
16
17# third-party libraries
18ANDROID_PLATFORM_DEVELOPMENT_SCRIPTS_PATH = os.path.join(
19    DIR_SOURCE_ROOT, 'third_party', 'android_platform', 'development',
20    'scripts')
21BUILD_PATH = os.path.join(DIR_SOURCE_ROOT, 'build')
22BUILD_UTIL_PATH = os.path.join(DIR_SOURCE_ROOT, 'build', 'util')
23
24DEVIL_PATH = os.path.join(DIR_SOURCE_ROOT, 'third_party', 'catapult', 'devil')
25JAVA_PATH = os.path.join(DIR_SOURCE_ROOT, 'third_party', 'jdk', 'current',
26                         'bin')
27TRACING_PATH = os.path.join(
28    DIR_SOURCE_ROOT, 'third_party', 'catapult', 'tracing')
29
30@contextlib.contextmanager
31def SysPath(path, position=None):
32  if position is None:
33    sys.path.append(path)
34  else:
35    sys.path.insert(position, path)
36  try:
37    yield
38  finally:
39    if sys.path[-1] == path:
40      sys.path.pop()
41    else:
42      sys.path.remove(path)
43
44
45# Map of CPU architecture name to (toolchain_name, binprefix) pairs.
46# TODO(digit): Use the build_vars.json file generated by gn.
47_TOOL_ARCH_MAP = {
48  'arm': ('arm-linux-androideabi-4.9', 'arm-linux-androideabi'),
49  'arm64': ('aarch64-linux-android-4.9', 'aarch64-linux-android'),
50  'x86': ('x86-4.9', 'i686-linux-android'),
51  'x86_64': ('x86_64-4.9', 'x86_64-linux-android'),
52  'x64': ('x86_64-4.9', 'x86_64-linux-android'),
53  'mips': ('mipsel-linux-android-4.9', 'mipsel-linux-android'),
54}
55
56# Cache used to speed up the results of ToolPath()
57# Maps (arch, tool_name) pairs to fully qualified program paths.
58# Useful because ToolPath() is called repeatedly for demangling C++ symbols.
59_cached_tool_paths = {}
60
61
62def ToolPath(tool, cpu_arch):
63  """Return a fully qualifed path to an arch-specific toolchain program.
64
65  Args:
66    tool: Unprefixed toolchain program name (e.g. 'objdump')
67    cpu_arch: Target CPU architecture (e.g. 'arm64')
68  Returns:
69    Fully qualified path (e.g. ..../aarch64-linux-android-objdump')
70  Raises:
71    Exception if the toolchain could not be found.
72  """
73  tool_path = _cached_tool_paths.get((tool, cpu_arch))
74  if tool_path:
75    return tool_path
76
77  toolchain_source, toolchain_prefix = _TOOL_ARCH_MAP.get(
78      cpu_arch, (None, None))
79  if not toolchain_source:
80    raise Exception('Could not find tool chain for ' + cpu_arch)
81
82  toolchain_subdir = (
83      'toolchains/%s/prebuilt/linux-x86_64/bin' % toolchain_source)
84
85  tool_path = os.path.join(constants.ANDROID_NDK_ROOT,
86                           toolchain_subdir,
87                           toolchain_prefix + '-' + tool)
88
89  _cached_tool_paths[(tool, cpu_arch)] = tool_path
90  return tool_path
91
92
93def GetAaptPath():
94  """Returns the path to the 'aapt' executable."""
95  return os.path.join(constants.ANDROID_SDK_TOOLS, 'aapt')
96