| # Copyright (C) 2013 Google Inc. All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are |
| # met: |
| # |
| # * Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # * Redistributions in binary form must reproduce the above |
| # copyright notice, this list of conditions and the following disclaimer |
| # in the documentation and/or other materials provided with the |
| # distribution. |
| # * Neither the name of Google Inc. nor the names of its |
| # contributors may be used to endorse or promote products derived from |
| # this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| """Generate Blink V8 bindings (.h and .cpp files). |
| |
| If run itself, caches Jinja templates (and creates dummy file for build, |
| since cache filenames are unpredictable and opaque). |
| |
| This module is *not* concurrency-safe without care: bytecode caching creates |
| a race condition on cache *write* (crashes if one process tries to read a |
| partially-written cache). However, if you pre-cache the templates (by running |
| the module itself), then you can parallelize compiling individual files, since |
| cache *reading* is safe. |
| |
| Input: An object of class IdlDefinitions, containing an IDL interface X |
| Output: V8X.h and V8X.cpp |
| |
| Design doc: http://www.chromium.org/developers/design-documents/idl-compiler |
| """ |
| |
| import os |
| import posixpath |
| import re |
| import sys |
| |
| # Path handling for libraries and templates |
| # Paths have to be normalized because Jinja uses the exact template path to |
| # determine the hash used in the cache filename, and we need a pre-caching step |
| # to be concurrency-safe. Use absolute path because __file__ is absolute if |
| # module is imported, and relative if executed directly. |
| # If paths differ between pre-caching and individual file compilation, the cache |
| # is regenerated, which causes a race condition and breaks concurrent build, |
| # since some compile processes will try to read the partially written cache. |
| module_path, module_filename = os.path.split(os.path.realpath(__file__)) |
| third_party_dir = os.path.normpath(os.path.join( |
| module_path, os.pardir, os.pardir, os.pardir, os.pardir)) |
| templates_dir = os.path.normpath(os.path.join( |
| module_path, os.pardir, 'templates')) |
| # Make sure extension is .py, not .pyc or .pyo, so doesn't depend on caching |
| module_pyname = os.path.splitext(module_filename)[0] + '.py' |
| |
| # jinja2 is in chromium's third_party directory. |
| # Insert at 1 so at front to override system libraries, and |
| # after path[0] == invoking script dir |
| sys.path.insert(1, third_party_dir) |
| import jinja2 |
| |
| import idl_types |
| from idl_types import IdlType |
| import v8_callback_interface |
| from v8_globals import includes, interfaces |
| import v8_interface |
| import v8_types |
| from v8_utilities import capitalize, cpp_name, conditional_string, v8_class_name |
| |
| |
| class CodeGeneratorV8(object): |
| def __init__(self, interfaces_info, cache_dir): |
| interfaces_info = interfaces_info or {} |
| self.interfaces_info = interfaces_info |
| self.jinja_env = initialize_jinja_env(cache_dir) |
| |
| # Set global type info |
| idl_types.set_ancestors(dict( |
| (interface_name, interface_info['ancestors']) |
| for interface_name, interface_info in interfaces_info.iteritems() |
| if interface_info['ancestors'])) |
| IdlType.set_callback_interfaces(set( |
| interface_name |
| for interface_name, interface_info in interfaces_info.iteritems() |
| if interface_info['is_callback_interface'])) |
| IdlType.set_implemented_as_interfaces(dict( |
| (interface_name, interface_info['implemented_as']) |
| for interface_name, interface_info in interfaces_info.iteritems() |
| if interface_info['implemented_as'])) |
| IdlType.set_garbage_collected_types(set( |
| interface_name |
| for interface_name, interface_info in interfaces_info.iteritems() |
| if 'GarbageCollected' in interface_info['inherited_extended_attributes'])) |
| IdlType.set_will_be_garbage_collected_types(set( |
| interface_name |
| for interface_name, interface_info in interfaces_info.iteritems() |
| if 'WillBeGarbageCollected' in interface_info['inherited_extended_attributes'])) |
| v8_types.set_component_dirs(dict( |
| (interface_name, interface_info['component_dir']) |
| for interface_name, interface_info in interfaces_info.iteritems())) |
| |
| def generate_code(self, definitions, interface_name): |
| """Returns .h/.cpp code as (header_text, cpp_text).""" |
| try: |
| interface = definitions.interfaces[interface_name] |
| except KeyError: |
| raise Exception('%s not in IDL definitions' % interface_name) |
| |
| # Store other interfaces for introspection |
| interfaces.update(definitions.interfaces) |
| |
| # Set local type info |
| IdlType.set_callback_functions(definitions.callback_functions.keys()) |
| IdlType.set_enums((enum.name, enum.values) |
| for enum in definitions.enumerations.values()) |
| |
| # Select appropriate Jinja template and contents function |
| if interface.is_callback: |
| header_template_filename = 'callback_interface.h' |
| cpp_template_filename = 'callback_interface.cpp' |
| generate_contents = v8_callback_interface.generate_callback_interface |
| else: |
| header_template_filename = 'interface.h' |
| cpp_template_filename = 'interface.cpp' |
| generate_contents = v8_interface.generate_interface |
| header_template = self.jinja_env.get_template(header_template_filename) |
| cpp_template = self.jinja_env.get_template(cpp_template_filename) |
| |
| # Generate contents (input parameters for Jinja) |
| template_contents = generate_contents(interface) |
| template_contents['code_generator'] = module_pyname |
| |
| # Add includes for interface itself and any dependencies |
| interface_info = self.interfaces_info[interface_name] |
| template_contents['header_includes'].add(interface_info['include_path']) |
| template_contents['header_includes'] = sorted(template_contents['header_includes']) |
| includes.update(interface_info.get('dependencies_include_paths', [])) |
| template_contents['cpp_includes'] = sorted(includes) |
| |
| # Render Jinja templates |
| header_text = header_template.render(template_contents) |
| cpp_text = cpp_template.render(template_contents) |
| return header_text, cpp_text |
| |
| |
| def initialize_jinja_env(cache_dir): |
| jinja_env = jinja2.Environment( |
| loader=jinja2.FileSystemLoader(templates_dir), |
| # Bytecode cache is not concurrency-safe unless pre-cached: |
| # if pre-cached this is read-only, but writing creates a race condition. |
| bytecode_cache=jinja2.FileSystemBytecodeCache(cache_dir), |
| keep_trailing_newline=True, # newline-terminate generated files |
| lstrip_blocks=True, # so can indent control flow tags |
| trim_blocks=True) |
| jinja_env.filters.update({ |
| 'blink_capitalize': capitalize, |
| 'conditional': conditional_if_endif, |
| 'runtime_enabled': runtime_enabled_if, |
| }) |
| return jinja_env |
| |
| |
| # [Conditional] |
| def conditional_if_endif(code, conditional_string): |
| # Jinja2 filter to generate if/endif directive blocks |
| if not conditional_string: |
| return code |
| return ('#if %s\n' % conditional_string + |
| code + |
| '#endif // %s\n' % conditional_string) |
| |
| |
| # [RuntimeEnabled] |
| def runtime_enabled_if(code, runtime_enabled_function_name): |
| if not runtime_enabled_function_name: |
| return code |
| # Indent if statement to level of original code |
| indent = re.match(' *', code).group(0) |
| return ('%sif (%s()) {\n' % (indent, runtime_enabled_function_name) + |
| ' %s\n' % '\n '.join(code.splitlines()) + |
| '%s}\n' % indent) |
| |
| |
| ################################################################################ |
| |
| def main(argv): |
| # If file itself executed, cache templates |
| try: |
| cache_dir = argv[1] |
| dummy_filename = argv[2] |
| except IndexError as err: |
| print 'Usage: %s CACHE_DIR DUMMY_FILENAME' % argv[0] |
| return 1 |
| |
| # Cache templates |
| jinja_env = initialize_jinja_env(cache_dir) |
| template_filenames = [filename for filename in os.listdir(templates_dir) |
| # Skip .svn, directories, etc. |
| if filename.endswith(('.cpp', '.h'))] |
| for template_filename in template_filenames: |
| jinja_env.get_template(template_filename) |
| |
| # Create a dummy file as output for the build system, |
| # since filenames of individual cache files are unpredictable and opaque |
| # (they are hashes of the template path, which varies based on environment) |
| with open(dummy_filename, 'w') as dummy_file: |
| pass # |open| creates or touches the file |
| |
| |
| if __name__ == '__main__': |
| sys.exit(main(sys.argv)) |
