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      1 # Copyright 2014 the V8 project authors. All rights reserved.
      2 # Use of this source code is governed by a BSD-style license that can be
      3 # found in the LICENSE file.
      4 
      5 
      6 import functools
      7 import logging
      8 import os
      9 import shlex
     10 import sys
     11 
     12 
     13 def memoize(default=None):
     14   """This decorator caches the return value of a parameterless pure function"""
     15   def memoizer(func):
     16     val = []
     17     @functools.wraps(func)
     18     def inner():
     19       if not val:
     20         ret = func()
     21         val.append(ret if ret is not None else default)
     22         if logging.getLogger().isEnabledFor(logging.INFO):
     23           print '%s -> %r' % (func.__name__, val[0])
     24       return val[0]
     25     return inner
     26   return memoizer
     27 
     28 
     29 @memoize()
     30 def IsWindows():
     31   return sys.platform in ['win32', 'cygwin']
     32 
     33 
     34 @memoize()
     35 def IsLinux():
     36   return sys.platform.startswith(('linux', 'freebsd'))
     37 
     38 
     39 @memoize()
     40 def IsMac():
     41   return sys.platform == 'darwin'
     42 
     43 
     44 @memoize()
     45 def gyp_defines():
     46   """Parses and returns GYP_DEFINES env var as a dictionary."""
     47   return dict(arg.split('=', 1)
     48       for arg in shlex.split(os.environ.get('GYP_DEFINES', '')))
     49 
     50 
     51 @memoize()
     52 def gyp_generator_flags():
     53   """Parses and returns GYP_GENERATOR_FLAGS env var as a dictionary."""
     54   return dict(arg.split('=', 1)
     55       for arg in shlex.split(os.environ.get('GYP_GENERATOR_FLAGS', '')))
     56 
     57 
     58 @memoize()
     59 def gyp_msvs_version():
     60   return os.environ.get('GYP_MSVS_VERSION', '')
     61 
     62 
     63 @memoize()
     64 def distributor():
     65   """
     66   Returns a string which is the distributed build engine in use (if any).
     67   Possible values: 'goma', 'ib', ''
     68   """
     69   if 'goma' in gyp_defines():
     70     return 'goma'
     71   elif IsWindows():
     72     if 'CHROME_HEADLESS' in os.environ:
     73       return 'ib' # use (win and !goma and headless) as approximation of ib
     74 
     75 
     76 @memoize()
     77 def platform():
     78   """
     79   Returns a string representing the platform this build is targetted for.
     80   Possible values: 'win', 'mac', 'linux', 'ios', 'android'
     81   """
     82   if 'OS' in gyp_defines():
     83     if 'android' in gyp_defines()['OS']:
     84       return 'android'
     85     else:
     86       return gyp_defines()['OS']
     87   elif IsWindows():
     88     return 'win'
     89   elif IsLinux():
     90     return 'linux'
     91   else:
     92     return 'mac'
     93 
     94 
     95 @memoize()
     96 def builder():
     97   """
     98   Returns a string representing the build engine (not compiler) to use.
     99   Possible values: 'make', 'ninja', 'xcode', 'msvs', 'scons'
    100   """
    101   if 'GYP_GENERATORS' in os.environ:
    102     # for simplicity, only support the first explicit generator
    103     generator = os.environ['GYP_GENERATORS'].split(',')[0]
    104     if generator.endswith('-android'):
    105       return generator.split('-')[0]
    106     elif generator.endswith('-ninja'):
    107       return 'ninja'
    108     else:
    109       return generator
    110   else:
    111     if platform() == 'android':
    112       # Good enough for now? Do any android bots use make?
    113       return 'make'
    114     elif platform() == 'ios':
    115       return 'xcode'
    116     elif IsWindows():
    117       return 'msvs'
    118     elif IsLinux():
    119       return 'make'
    120     elif IsMac():
    121       return 'xcode'
    122     else:
    123       assert False, 'Don\'t know what builder we\'re using!'
    124