1 # Copyright (C) 2013 Google Inc. All rights reserved. 2 # 3 # Redistribution and use in source and binary forms, with or without 4 # modification, are permitted provided that the following conditions are 5 # met: 6 # 7 # * Redistributions of source code must retain the above copyright 8 # notice, this list of conditions and the following disclaimer. 9 # * Redistributions in binary form must reproduce the above 10 # copyright notice, this list of conditions and the following disclaimer 11 # in the documentation and/or other materials provided with the 12 # distribution. 13 # * Neither the name of Google Inc. nor the names of its 14 # contributors may be used to endorse or promote products derived from 15 # this software without specific prior written permission. 16 # 17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 """Generate Blink V8 bindings (.h and .cpp files). 30 31 If run itself, caches Jinja templates (and creates dummy file for build, 32 since cache filenames are unpredictable and opaque). 33 34 This module is *not* concurrency-safe without care: bytecode caching creates 35 a race condition on cache *write* (crashes if one process tries to read a 36 partially-written cache). However, if you pre-cache the templates (by running 37 the module itself), then you can parallelize compiling individual files, since 38 cache *reading* is safe. 39 40 Input: An object of class IdlDefinitions, containing an IDL interface X 41 Output: V8X.h and V8X.cpp 42 43 Design doc: http://www.chromium.org/developers/design-documents/idl-compiler 44 """ 45 46 import os 47 import posixpath 48 import re 49 import sys 50 51 # Path handling for libraries and templates 52 # Paths have to be normalized because Jinja uses the exact template path to 53 # determine the hash used in the cache filename, and we need a pre-caching step 54 # to be concurrency-safe. Use absolute path because __file__ is absolute if 55 # module is imported, and relative if executed directly. 56 # If paths differ between pre-caching and individual file compilation, the cache 57 # is regenerated, which causes a race condition and breaks concurrent build, 58 # since some compile processes will try to read the partially written cache. 59 module_path, module_filename = os.path.split(os.path.realpath(__file__)) 60 third_party_dir = os.path.normpath(os.path.join( 61 module_path, os.pardir, os.pardir, os.pardir, os.pardir)) 62 templates_dir = os.path.normpath(os.path.join( 63 module_path, os.pardir, 'templates')) 64 # Make sure extension is .py, not .pyc or .pyo, so doesn't depend on caching 65 module_pyname = os.path.splitext(module_filename)[0] + '.py' 66 67 # jinja2 is in chromium's third_party directory. 68 # Insert at 1 so at front to override system libraries, and 69 # after path[0] == invoking script dir 70 sys.path.insert(1, third_party_dir) 71 import jinja2 72 73 import idl_types 74 from idl_types import IdlType 75 import v8_callback_interface 76 from v8_globals import includes, interfaces 77 import v8_interface 78 import v8_types 79 from v8_utilities import capitalize, cpp_name, conditional_string, v8_class_name 80 81 82 class CodeGeneratorV8(object): 83 def __init__(self, interfaces_info, cache_dir): 84 interfaces_info = interfaces_info or {} 85 self.interfaces_info = interfaces_info 86 self.jinja_env = initialize_jinja_env(cache_dir) 87 88 # Set global type info 89 idl_types.set_ancestors(dict( 90 (interface_name, interface_info['ancestors']) 91 for interface_name, interface_info in interfaces_info.iteritems() 92 if interface_info['ancestors'])) 93 IdlType.set_callback_interfaces(set( 94 interface_name 95 for interface_name, interface_info in interfaces_info.iteritems() 96 if interface_info['is_callback_interface'])) 97 IdlType.set_implemented_as_interfaces(dict( 98 (interface_name, interface_info['implemented_as']) 99 for interface_name, interface_info in interfaces_info.iteritems() 100 if interface_info['implemented_as'])) 101 IdlType.set_garbage_collected_types(set( 102 interface_name 103 for interface_name, interface_info in interfaces_info.iteritems() 104 if 'GarbageCollected' in interface_info['inherited_extended_attributes'])) 105 IdlType.set_will_be_garbage_collected_types(set( 106 interface_name 107 for interface_name, interface_info in interfaces_info.iteritems() 108 if 'WillBeGarbageCollected' in interface_info['inherited_extended_attributes'])) 109 v8_types.set_component_dirs(dict( 110 (interface_name, interface_info['component_dir']) 111 for interface_name, interface_info in interfaces_info.iteritems())) 112 113 def generate_code(self, definitions, interface_name): 114 """Returns .h/.cpp code as (header_text, cpp_text).""" 115 try: 116 interface = definitions.interfaces[interface_name] 117 except KeyError: 118 raise Exception('%s not in IDL definitions' % interface_name) 119 120 # Store other interfaces for introspection 121 interfaces.update(definitions.interfaces) 122 123 # Set local type info 124 IdlType.set_callback_functions(definitions.callback_functions.keys()) 125 IdlType.set_enums((enum.name, enum.values) 126 for enum in definitions.enumerations.values()) 127 128 # Select appropriate Jinja template and contents function 129 if interface.is_callback: 130 header_template_filename = 'callback_interface.h' 131 cpp_template_filename = 'callback_interface.cpp' 132 generate_contents = v8_callback_interface.generate_callback_interface 133 else: 134 header_template_filename = 'interface.h' 135 cpp_template_filename = 'interface.cpp' 136 generate_contents = v8_interface.generate_interface 137 header_template = self.jinja_env.get_template(header_template_filename) 138 cpp_template = self.jinja_env.get_template(cpp_template_filename) 139 140 # Generate contents (input parameters for Jinja) 141 template_contents = generate_contents(interface) 142 template_contents['code_generator'] = module_pyname 143 144 # Add includes for interface itself and any dependencies 145 interface_info = self.interfaces_info[interface_name] 146 template_contents['header_includes'].add(interface_info['include_path']) 147 template_contents['header_includes'] = sorted(template_contents['header_includes']) 148 includes.update(interface_info.get('dependencies_include_paths', [])) 149 template_contents['cpp_includes'] = sorted(includes) 150 151 # Render Jinja templates 152 header_text = header_template.render(template_contents) 153 cpp_text = cpp_template.render(template_contents) 154 return header_text, cpp_text 155 156 157 def initialize_jinja_env(cache_dir): 158 jinja_env = jinja2.Environment( 159 loader=jinja2.FileSystemLoader(templates_dir), 160 # Bytecode cache is not concurrency-safe unless pre-cached: 161 # if pre-cached this is read-only, but writing creates a race condition. 162 bytecode_cache=jinja2.FileSystemBytecodeCache(cache_dir), 163 keep_trailing_newline=True, # newline-terminate generated files 164 lstrip_blocks=True, # so can indent control flow tags 165 trim_blocks=True) 166 jinja_env.filters.update({ 167 'blink_capitalize': capitalize, 168 'conditional': conditional_if_endif, 169 'runtime_enabled': runtime_enabled_if, 170 }) 171 return jinja_env 172 173 174 # [Conditional] 175 def conditional_if_endif(code, conditional_string): 176 # Jinja2 filter to generate if/endif directive blocks 177 if not conditional_string: 178 return code 179 return ('#if %s\n' % conditional_string + 180 code + 181 '#endif // %s\n' % conditional_string) 182 183 184 # [RuntimeEnabled] 185 def runtime_enabled_if(code, runtime_enabled_function_name): 186 if not runtime_enabled_function_name: 187 return code 188 # Indent if statement to level of original code 189 indent = re.match(' *', code).group(0) 190 return ('%sif (%s()) {\n' % (indent, runtime_enabled_function_name) + 191 ' %s\n' % '\n '.join(code.splitlines()) + 192 '%s}\n' % indent) 193 194 195 ################################################################################ 196 197 def main(argv): 198 # If file itself executed, cache templates 199 try: 200 cache_dir = argv[1] 201 dummy_filename = argv[2] 202 except IndexError as err: 203 print 'Usage: %s CACHE_DIR DUMMY_FILENAME' % argv[0] 204 return 1 205 206 # Cache templates 207 jinja_env = initialize_jinja_env(cache_dir) 208 template_filenames = [filename for filename in os.listdir(templates_dir) 209 # Skip .svn, directories, etc. 210 if filename.endswith(('.cpp', '.h'))] 211 for template_filename in template_filenames: 212 jinja_env.get_template(template_filename) 213 214 # Create a dummy file as output for the build system, 215 # since filenames of individual cache files are unpredictable and opaque 216 # (they are hashes of the template path, which varies based on environment) 217 with open(dummy_filename, 'w') as dummy_file: 218 pass # |open| creates or touches the file 219 220 221 if __name__ == '__main__': 222 sys.exit(main(sys.argv)) 223
