Scripts to generate Android.mk for framework Skia.

platform_tools/android/bin/gyp_to_android.py

Index: platform_tools/android/bin/gyp_to_android.py
diff --git a/platform_tools/android/bin/gyp_to_android.py b/platform_tools/android/bin/gyp_to_android.py
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+#!/usr/bin/python
+
+# Copyright 2014 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+    Script for generating the Android framework's verision of Skia from gyp
+    files.
+"""
+
+import os
+
+# Folder containing all gyp files and generated gypd files.
+GYP_FOLDER = 'gyp'
+
+def WriteGroup(f, name, items, append):
+  """
+  Helper function to list all names passed to a variable.
+  @param f File open for writing (Android.mk)
+  @param name Name of the makefile variable (e.g. LOCAL_CFLAGS)
+  @param items list of strings to be passed to the variable.
+  @param append Whether to append to the variable or overwrite it.
+  """
+  if len(items) == 0:
+    return
+  if append:
+    f.write('%s += \\\n' % name)
+  else:
+    f.write('%s := \\\n' % name)
+  for item in items:
+    f.write('\t%s \\\n' % item)
+  # Add an extra blank line since the last line ended in a \
+  f.write('\n')
+
+class VarsDict(dict):
+  """
+  Custom dict of lists for each makefile variable. Does not allow insertion of
+  new keys.
+  """
+  def __init__(self):
+    dict.__init__(self)
+    self.__allow_insert = True
+    self['cflags'] = []
+    self['cppflags'] = []
+    self['defines'] = []
+    self['sources'] = []
+    self['shared_libraries'] = []
+    self['static_libraries'] = []
+    self['include_dirs'] = []
+    self['export_include_dirs'] = []
+    self['known_targets'] = []
+    self.__allow_insert = False
+    self.__allow_convert = True
+
+  def __setitem__(self, k, v):
+    # Prevent the insertion of arbitrary keys.
+    assert self.__allow_insert
+    dict.__setitem__(self, k, v)
+
+  def ConvertDefines(self):
+    """
+    Add each string in 'defines' to 'cflags', prepended with '-D'. Can only
+    be done once.
+    """
+    assert self.__allow_convert
+    self.__allow_convert = False
+    for define in self['defines']:
+      define = '-D' + define
+      self['cflags'].append(define)
+
+def WriteLocalVars(f, var_dict, append):
+  """
+  Helper function to write all the members of var_dict to the makefile.
+  @param f File open for writing (Android.mk)
+  @param var_dict VarsDict holding the unique values for one configuration.
+  @param append Whether to append to each makefile variable or overwrite it.
+  """
+  var_dict.ConvertDefines()
+  # Always append LOCAL_CFLAGS. This allows us to define some early on in the
+  # makefile and not overwrite them.
+  WriteGroup(f, 'LOCAL_CFLAGS', var_dict['cflags'], True)
+  WriteGroup(f, 'LOCAL_CPPFLAGS', var_dict['cppflags'], append)
+  WriteGroup(f, 'LOCAL_SRC_FILES', var_dict['sources'], append)
+  WriteGroup(f, 'LOCAL_SHARED_LIBRARIES', var_dict['shared_libraries'], append)
+  WriteGroup(f, 'LOCAL_STATIC_LIBRARIES', var_dict['static_libraries'], append)
+  WriteGroup(f, 'LOCAL_C_INCLUDES', var_dict['include_dirs'], append)
+  WriteGroup(f, 'LOCAL_EXPORT_C_INCLUDE_DIRS', var_dict['export_include_dirs'],
+             append)
+
+DEBUGGING_HELP = (
+"""
+###############################################################################
+#
+# PROBLEMS WITH SKIA DEBUGGING?? READ THIS...
+#
+# The debug build results in changes to the Skia headers. This means that those
+# using libskia must also be built with the debug version of the Skia headers.
+# There are a few scenarios where this comes into play:
+#
+# (1) You're building debug code that depends on libskia.
+#   (a) If libskia is built in release, then define SK_RELEASE when building
+#       your sources.
+#   (b) If libskia is built with debugging (see step 2), then no changes are
+#       needed since your sources and libskia have been built with SK_DEBUG.
+# (2) You're building libskia in debug mode.
+#   (a) RECOMMENDED: You can build the entire system in debug mode. Do this by
+#       updating your build/config.mk to include -DSK_DEBUG on the line that
+#       defines COMMON_GLOBAL_CFLAGS
+#   (b) You can update all the users of libskia to define SK_DEBUG when they are
+#       building their sources.
+#
+# NOTE: If neither SK_DEBUG or SK_RELEASE are defined then Skia checks NDEBUG to
+#       determine which build type to use.
+###############################################################################
+
+"""
+)
+
+def WriteAndroidMk(common, arm, armNeon, x86, default):
+  """
+  Given all the variables, write the final make file.
+  @param common VarsDict holding variables definitions common to all
+                configurations.
+  @param arm VarsDict holding variable definitions unique to arm. Will be
+             written to the makefile inside an 'ifeq ($(TARGET_ARCH), arm)'
+             block.
+  @param armNeon VarsDict holding variable definitions unique to arm with neon.
+                 Will be written inside an 'ifeq ($(ARCH_ARM_HAVE_NEON),true)'
+                 block nested inside an 'ifeq ($(TARGET_ARCH), arm)' block.
+  @param x86 VarsDict holding variable definitions unique to x86. Will be
+             written inside an 'ifeq ($(TARGET_ARCH),x86)' block.
+  @param default VarsDict holding variable definitions for an architecture
+                 without custom optimizations.
+  TODO: Add mips.
+  """
+  with open('Android.mk', 'w') as f:
+    f.write('BASE_PATH := $(call my-dir)\n')
+    f.write('LOCAL_PATH:= $(call my-dir)\n')
+
+    f.write(DEBUGGING_HELP)
+
+    f.write('include $(CLEAR_VARS)\n')
+
+    f.write('LOCAL_ARM_MODE := thumb\n')
+
+    # need a flag to tell the C side when we're on devices with large memory
+    # budgets (i.e. larger than the low-end devices that initially shipped)
+    f.write('ifeq ($(ARCH_ARM_HAVE_VFP),true)\n')
+    f.write('\tLOCAL_CFLAGS += -DANDROID_LARGE_MEMORY_DEVICE\n')
+    f.write('endif\n\n')
+
+    f.write('ifeq ($(TARGET_ARCH),x86)\n')
+    f.write('\tLOCAL_CFLAGS += -DANDROID_LARGE_MEMORY_DEVICE\n')
+    f.write('endif\n\n')
+
+    f.write('# used for testing\n')
+    f.write('#LOCAL_CFLAGS += -g -O0\n\n')
+
+    f.write('ifeq ($(NO_FALLBACK_FONT),true)\n')
+    f.write('\tLOCAL_CFLAGS += -DNO_FALLBACK_FONT\n')
+    f.write('endif\n\n')
+
+    WriteLocalVars(f, common, False)
+
+    f.write('ifeq ($(TARGET_ARCH),arm)\n')
+    f.write('ifeq ($(ARCH_ARM_HAVE_NEON),true)\n')
+    WriteLocalVars(f, armNeon, True)
+    f.write('endif\n\n')
+    WriteLocalVars(f, arm, True)
+    # FIXME: Is 'else ifeq' the right way to do this?
+    # FIXME: Is x86 the right name?
+    f.write('else ifeq ($(TARGET_ARCH),x86)\n')
+    WriteLocalVars(f, x86, True)
+    f.write('else\n')
+    WriteLocalVars(f, default, True)
+    f.write('endif\n\n')
+
+    f.write('include external/stlport/libstlport.mk\n')
+    f.write('LOCAL_MODULE:= libskia\n')
+    f.write('include $(BUILD_SHARED_LIBRARY)\n')
+
+def AddToList(li, item):
+  """
+  Add item to li, but only if it is not already in li.
+  """
+  if item not in li:
+    li.append(item)
+
+def GetMembers(d, name):
+  """
+  Get the list corresponding to name in dictionary d.
+  """
+  if not name in d:
+    return []
+  return d[name]
+
+def ParseDictionary(var_dict, d, current_target_name):
+  """
+  Helper function to get the meaningful entries in a dictionary.
+  @param var_dict VarsDict object for storing the results of the parsing.
+  @param d Dictionary object to parse.
+  @param current_target_name The current target being parsed. If this
+                             dictionary is a target, this will be its entry
+                             'target_name'. Otherwise, this will be the name of
+                             the target which contains this dictionary.
+  """
+  for source in GetMembers(d, 'sources'):
+    if source.endswith('.h'):
+      # Android.mk does not need the header files.
+      continue
+    if source.endswith('gypi'):
+      # The gypi files are included in sources, but the sources they included
+      # are also included. No need to parse them again.
+      continue
+    # The path is relative to the gyp folder, but Android wants the path
+    # relative to the root.
+    source = source.replace('../src', 'src', 1)
+    AddToList(var_dict['sources'], source)
+
+  for lib in GetMembers(d, 'libraries'):
+    if lib.endswith('.a'):
+      # Remove the '.a'
+      lib = lib[:-2]
+      # Add 'lib', if necessary
+      if not lib.startswith('lib'):
+        lib = 'lib' + lib
+      AddToList(var_dict['static_libraries'], lib)
+    else:
+      # lib will be in the form of '-l<name>'. Change it to 'lib<name>'
+      lib = lib.replace('-l', 'lib', 1)
+      AddToList(var_dict['shared_libraries'], lib)
+
+  for dependency in GetMembers(d, 'dependencies'):
+    # Each dependency is listed as
+    #   <path_to_file>:<target>#target
+    li = dependency.split(':')
+    assert(len(li) <= 2 and len(li) >= 1)
+    sub_targets = []
+    if len(li) == 2 and li[1] != '*':
+      sub_targets.append(li[1].split('#')[0])
+    sub_path = li[0]
+    assert(sub_path.endswith('.gyp'))
+    # Although the original reference is to a .gyp, parse the corresponding
+    # gypd file, which was constructed by gyp.
+    sub_path = sub_path + 'd'
+    ParseGypd(var_dict, sub_path, sub_targets)
+
+  if 'default_configuration' in d:
+    config_name = d['default_configuration']
+    # default_configuration is meaningless without configurations
+    assert('configurations' in d)
+    config = d['configurations'][config_name]
+    ParseDictionary(var_dict, config, current_target_name)
+
+  for flag in GetMembers(d, 'cflags'):
+    AddToList(var_dict['cflags'], flag)
+  for flag in GetMembers(d, 'cflags_cc'):
+    AddToList(var_dict['cppflags'], flag)
+
+  for include in GetMembers(d, 'include_dirs'):
+    # The input path will be relative to gyp/, but Android wants relative to
+    # LOCAL_PATH
+    include = include.replace('..', '$(LOCAL_PATH)', 1)
+    # Remove a trailing slash, if present.
+    if include.endswith('/'):
+      include = include[:-1]
+    AddToList(var_dict['include_dirs'], include)
+    # For the top level, libskia, include directories should be exported.
+    if current_target_name == 'libskia':
+      AddToList(var_dict['export_include_dirs'], include)
+
+  for define in GetMembers(d, 'defines'):
+    AddToList(var_dict['defines'], define)
+
+def ParseGypd(var_dict, path, desired_targets=None):
+  """
+  Parse a gypd file.
+  @param var_dict VarsDict object for storing the result of the parse.
+  @param path Path to gypd file.
+  @param desired_targets List of targets to be parsed from this file. If empty,
+                         parse all targets.
+  """
+  d = {}
+  with open(path, 'r') as f:
+    # Read the entire file as a dictionary
+    d = eval(f.read())
+  # The gypd file is structured such that the top level dictionary has an entry
+  # named 'targets'
+  if 'targets' not in d:
+    return
+  targets = d['targets']
+  for target in targets:
+    target_name = target['target_name']
+    if target_name in var_dict['known_targets']:
+      # Avoid circular dependencies
+      continue
+    if desired_targets and target_name not in desired_targets:
+      # Our caller does not depend on this one
+      continue
+    # Add it to our known targets so we don't parse it again
+    var_dict['known_targets'].append(target_name)
+
+    ParseDictionary(var_dict, target, target_name)
+
+def Intersect(var_dict_list):
+  """
+  Find the intersection of a list of VarsDicts and trim each input to its
+  unique entries.
+  @param var_dict_list list of VarsDicts.
+  @return VarsDict containing list entries common to all VarsDicts in
+          var_dict_list
+  """
+  intersection = VarsDict()
+  # First VarsDict
+  var_dictA = var_dict_list[0]
+  # The rest.
+  otherVarDicts = var_dict_list[1:]
+
+  for key in var_dictA.keys():
+    # Copy A's list, so we can continue iterating after modifying the original.
+    aList = list(var_dictA[key])
+    for item in aList:
+      # If item is in all lists, add to intersection, and remove from all.
+      in_all_lists = True
+      for var_dict in otherVarDicts:
+        # Each dictionary must be a VarsDict, which always contains the same
+        # set of keys.
+        if not item in var_dict[key]:
+          in_all_lists = False
+          break
+      if in_all_lists:
+        intersection[key].append(item)
+        for var_dict in var_dict_list:
+          var_dict[key].remove(item)
+  return intersection
+
+def CleanGypdFiles():
+  """
+  Remove the gypd files generated by android_framework_gyp.main().
+  """
+  assert os.path.isdir(GYP_FOLDER)
+  files = os.listdir(GYP_FOLDER)
+  for f in files:
+    if f.endswith('gypd'):
+      os.remove(os.path.join(GYP_FOLDER, f))
+
+import android_framework_gyp
+
+def main():
+  # Move up to top of trunk
+  script_dir = os.path.dirname(__file__)
+  skia_dir = os.path.normpath(os.path.join(script_dir, os.pardir, os.pardir,
+                                           os.pardir))
+  os.chdir(skia_dir)
+
+  main_gypd_file = os.path.join(GYP_FOLDER, 'android_framework_lib.gypd')
+
+  print 'Creating Android.mk',
+
+  # Call the script to generate gypd files, first using a non-existant archtype.
+  android_framework_gyp.main('other', False)
+  # And store its variables in the default dict
+  default_var_dict = VarsDict()
+  ParseGypd(default_var_dict, main_gypd_file)
+  CleanGypdFiles()
+
+  print '.',
+
+  # Now do the same for Arm. arm_var_dict will contain all the variable
+  # definitions needed to build with arm (meaning that it will share most
+  # with default_var_dict).
+  android_framework_gyp.main('arm', False)
+  arm_var_dict = VarsDict()
+  ParseGypd(arm_var_dict, main_gypd_file)
+  CleanGypdFiles()
+
+  print '.',
+
+  # Now do the same for Arm/Neon.
+  android_framework_gyp.main('arm', True)
+  arm_neon_var_dict = VarsDict()
+  ParseGypd(arm_neon_var_dict, main_gypd_file)
+  CleanGypdFiles()
+
+  print '.',
+
+  # Now do the same for x86.
+  android_framework_gyp.main('x86', False)
+  x86_var_dict = VarsDict()
+  ParseGypd(x86_var_dict, main_gypd_file)
+  CleanGypdFiles()
+
+  # Compute the intersection of all targets. All the files in the intersection
+  # should be part of the makefile always. Each dict will now contain trimmed
+  # lists containing only variable definitions specific to that configuration.
+  common = Intersect([default_var_dict, arm_var_dict, arm_neon_var_dict,
+                      x86_var_dict])
+
+  # Further trim arm_neon_var_dict with arm_var_dict. After this call,
+  # arm_var_dict (which will now be the intersection) includes all definitions
+  # used by both arm and arm + neon, and arm_neon_var_dict will only contain
+  # those specific to arm + neon.
+  arm_var_dict = Intersect([arm_var_dict, arm_neon_var_dict])
+
+  WriteAndroidMk(common, arm_var_dict, arm_neon_var_dict, x86_var_dict,
+                 default_var_dict)
+
+if __name__ == '__main__':
+  main()