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1#!/usr/bin/env python
2#
3# Copyright 2018 Google Inc.
4#
5# Use of this source code is governed by a BSD-style license that can be
6# found in the LICENSE file.
7
8# Generate Android.bp for Skia from GN configuration.
9
10import argparse
11import json
12import os
13import pprint
14import string
15import subprocess
16import tempfile
17
18parser = argparse.ArgumentParser(description='Process some cmdline flags.')
19parser.add_argument('--gn', dest='gn_cmd', default='gn')
20args = parser.parse_args()
21
22def GenerateJSONFromGN(gn_args):
23  gn_args = ' '.join(sorted('%s=%s' % (k,v) for (k,v) in gn_args.iteritems()))
24  tmp = tempfile.mkdtemp()
25  subprocess.check_call([args.gn_cmd, 'gen', tmp, '--args=%s' % gn_args,
26                         '--ide=json'])
27  return json.load(open(os.path.join(tmp, 'project.json')))
28
29def _strip_slash(lst):
30  return {str(p.lstrip('/')) for p in lst}
31
32def GrabDependentValues(js, name, value_type, list_to_extend, exclude):
33  # Grab the values from other targets that $name depends on (e.g. optional
34  # Skia components, gms, tests, etc).
35  for dep in js['targets'][name]['deps']:
36    if 'modules' in dep:
37      continue   # Modules require special handling -- skip for now.
38    if 'third_party' in dep:
39      continue   # We've handled all third-party DEPS as static or shared_libs.
40    if 'none' in dep:
41      continue   # We'll handle all cpu-specific sources manually later.
42    if exclude and exclude in dep:
43      continue
44    list_to_extend.update(_strip_slash(js['targets'][dep].get(value_type, [])))
45    GrabDependentValues(js, dep, value_type, list_to_extend, exclude)
46
47def CleanupCFlags(cflags):
48  # Only use the generated flags related to warnings.
49  cflags = {s for s in cflags if s.startswith('-W')}
50  # Add additional warning suppressions so we can build
51  # third_party/vulkanmemoryallocator
52  cflags = cflags.union([
53    "-Wno-implicit-fallthrough",
54    "-Wno-missing-field-initializers",
55    "-Wno-thread-safety-analysis",
56    "-Wno-unused-variable",
57  ])
58  # Add the rest of the flags we want.
59  cflags = cflags.union([
60    "-fvisibility=hidden",
61    "-D_FORTIFY_SOURCE=1",
62    "-DSKIA_DLL",
63    "-DSKIA_IMPLEMENTATION=1",
64    "-DATRACE_TAG=ATRACE_TAG_VIEW",
65    "-DSK_PRINT_CODEC_MESSAGES",
66  ])
67
68  # We need to undefine FORTIFY_SOURCE before we define it. Insert it at the
69  # beginning after sorting.
70  cflags = sorted(cflags)
71  cflags.insert(0, "-U_FORTIFY_SOURCE")
72  return cflags
73
74def CleanupCCFlags(cflags_cc):
75  # Only use the generated flags related to warnings.
76  cflags_cc       = {s for s in cflags_cc      if s.startswith('-W')}
77  # Add the rest of the flags we want.
78  cflags_cc.add("-fexceptions")
79  return cflags_cc
80
81def _get_path_info(path, kind):
82  assert path == "../src"
83  assert kind == "abspath"
84  # While we want absolute paths in GN, relative paths work best here.
85  return "src"
86
87def GetArchSources(opts_file):
88  # For architecture specific files, it's easier to just read the same source
89  # that GN does (opts.gni) rather than re-run GN once for each architecture.
90
91  # This .gni file we want to read is close enough to Python syntax
92  # that we can use execfile() if we supply definitions for GN builtins.
93  builtins = { 'get_path_info': _get_path_info }
94  defs = {}
95  execfile(opts_file, builtins, defs)
96
97  # Perform any string substitutions.
98  for arch in defs:
99    defs[arch] = [ p.replace('$_src', 'src') for p in defs[arch]]
100
101  return defs
102
103def WriteUserConfig(userConfigPath, defines):
104  # Most defines go into SkUserConfig.h
105  defines.remove('NDEBUG')                 # Controlled by the Android build
106  defines.remove('SKIA_IMPLEMENTATION=1')  # don't export this define.
107  if 'WIN32_LEAN_AND_MEAN' in defines:     # Controlled by the Android build
108    defines.remove('WIN32_LEAN_AND_MEAN')
109  if '_HAS_EXCEPTIONS=0' in defines:       # Controlled by the Android build
110    defines.remove('_HAS_EXCEPTIONS=0')
111
112  #... and all the #defines we want to put in SkUserConfig.h.
113  with open(userConfigPath, 'w') as f:
114    print >>f, '// DO NOT MODIFY! This file is autogenerated by gn_to_bp.py.'
115    print >>f, '// If need to change a define, modify SkUserConfigManual.h'
116    print >>f, '#pragma once'
117    print >>f, '#include "SkUserConfigManual.h"'
118    for define in sorted(defines):
119      print >>f, '#define', define.replace('=', ' ')
120