IDL: Support [Unforgeable] on interface definitions

Source/bindings/scripts/v8_attributes.py

 # 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
@@ skipping 22 matching lines @@
 Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
 """
 
 import idl_types
 from idl_types import inherits_interface
 from v8_globals import includes, interfaces
 import v8_types
 import v8_utilities
 from v8_utilities import (cpp_name_or_partial, capitalize, cpp_name, has_extended_attribute,
                           has_extended_attribute_value, scoped_name, strip_suffix,
-                          uncapitalize, extended_attribute_value_as_list)
+                          uncapitalize, extended_attribute_value_as_list, is_unforgeable)
 
 
 def attribute_context(interface, attribute):
     idl_type = attribute.idl_type
     base_idl_type = idl_type.base_type
     extended_attributes = attribute.extended_attributes
 
     idl_type.add_includes_for_type()
 
     # [CheckSecurity]
@@ skipping 17 matching lines @@
 
     # [OnlyExposedToPrivateScript]
     is_only_exposed_to_private_script = 'OnlyExposedToPrivateScript' in extended_attributes
 
     if (base_idl_type == 'EventHandler' and
         interface.name in ['Window', 'WorkerGlobalScope'] and
         attribute.name == 'onerror'):
         includes.add('bindings/core/v8/V8ErrorHandler.h')
 
     context = {
-        'access_control_list': access_control_list(attribute),
+        'access_control_list': access_control_list(interface, attribute),
         'activity_logging_world_list_for_getter': v8_utilities.activity_logging_world_list(attribute, 'Getter'),  # [ActivityLogging]
         'activity_logging_world_list_for_setter': v8_utilities.activity_logging_world_list(attribute, 'Setter'),  # [ActivityLogging]
         'activity_logging_world_check': v8_utilities.activity_logging_world_check(attribute),  # [ActivityLogging]
         'argument_cpp_type': idl_type.cpp_type_args(used_as_rvalue_type=True),
         'cached_attribute_validation_method': extended_attributes.get('CachedAttribute'),
         'conditional_string': v8_utilities.conditional_string(attribute),
         'constructor_type': idl_type.constructor_type_name
                             if is_constructor_attribute(attribute) else None,
         'cpp_name': cpp_name(attribute),
         'cpp_type': idl_type.cpp_type,
@@ skipping 19 matching lines @@
         'is_nullable': idl_type.is_nullable,
         'is_explicit_nullable': idl_type.is_explicit_nullable,
         'is_partial_interface_member':
             'PartialInterfaceImplementedAs' in extended_attributes,
         'is_per_world_bindings': 'PerWorldBindings' in extended_attributes,
         'is_read_only': attribute.is_read_only,
         'is_reflect': is_reflect,
         'is_replaceable': 'Replaceable' in attribute.extended_attributes,
         'is_static': attribute.is_static,
         'is_url': 'URL' in extended_attributes,
-        'is_unforgeable': 'Unforgeable' in extended_attributes,
+        'is_unforgeable': is_unforgeable(interface, attribute),
         'use_output_parameter_for_result': idl_type.use_output_parameter_for_result,
         'measure_as': v8_utilities.measure_as(attribute),  # [MeasureAs]
         'name': attribute.name,
         'only_exposed_to_private_script': is_only_exposed_to_private_script,
         'per_context_enabled_function': v8_utilities.per_context_enabled_function_name(attribute),  # [PerContextEnabled]
         'private_script_v8_value_to_local_cpp_value': idl_type.v8_value_to_local_cpp_value(
             extended_attributes, 'v8Value', 'cppValue', isolate='scriptState->isolate()', used_in_private_script=True),
-        'property_attributes': property_attributes(attribute),
+        'property_attributes': property_attributes(interface, attribute),
         'put_forwards': 'PutForwards' in extended_attributes,
         'reflect_empty': extended_attributes.get('ReflectEmpty'),
         'reflect_invalid': extended_attributes.get('ReflectInvalid', ''),
         'reflect_missing': extended_attributes.get('ReflectMissing'),
         'reflect_only': extended_attribute_value_as_list(attribute, 'ReflectOnly'),
         'runtime_enabled_function': v8_utilities.runtime_enabled_function_name(attribute),  # [RuntimeEnabled]
         'setter_callback': setter_callback_name(interface, attribute),
         'should_be_exposed_to_script': not (is_implemented_in_private_script and is_only_exposed_to_private_script),
         'world_suffixes': ['', 'ForMainWorld']
                           if 'PerWorldBindings' in extended_attributes
@@ skipping 296 matching lines @@
          'PutForwards' not in extended_attributes) or
         is_constructor_attribute(attribute)):
         return '%sV8Internal::%sForceSetAttributeOnThisCallback' % (
             cpp_class_name_or_partial, cpp_class_name)
     if attribute.is_read_only and 'PutForwards' not in extended_attributes:
         return '0'
     return '%sV8Internal::%sAttributeSetterCallback' % (cpp_class_name_or_partial, attribute.name)
 
 
 # [DoNotCheckSecurity], [Unforgeable]
-def access_control_list(attribute):
+def access_control_list(interface, attribute):
     extended_attributes = attribute.extended_attributes
     access_control = []
     if 'DoNotCheckSecurity' in extended_attributes:
         do_not_check_security = extended_attributes['DoNotCheckSecurity']
         if do_not_check_security == 'Setter':
             access_control.append('v8::ALL_CAN_WRITE')
         else:
             access_control.append('v8::ALL_CAN_READ')
             if (not attribute.is_read_only or
                 'Replaceable' in extended_attributes):
                 access_control.append('v8::ALL_CAN_WRITE')
-    if 'Unforgeable' in extended_attributes:
+    if is_unforgeable(interface, attribute):
         access_control.append('v8::PROHIBITS_OVERWRITING')
     return access_control or ['v8::DEFAULT']
 
 
 # [NotEnumerable], [Unforgeable]
-def property_attributes(attribute):
+def property_attributes(interface, attribute):
     extended_attributes = attribute.extended_attributes
     property_attributes_list = []
     if ('NotEnumerable' in extended_attributes or
         is_constructor_attribute(attribute)):
         property_attributes_list.append('v8::DontEnum')
-    if 'Unforgeable' in extended_attributes:
+    if is_unforgeable(interface, attribute):
         property_attributes_list.append('v8::DontDelete')
     return property_attributes_list or ['v8::None']
 
 
 # [Custom], [Custom=Getter]
 def has_custom_getter(attribute):
     extended_attributes = attribute.extended_attributes
     return ('Custom' in extended_attributes and
             extended_attributes['Custom'] in [None, 'Getter'])
 
@@ skipping 15 matching lines @@
     lambda self: strip_suffix(self.base_type, 'Constructor'))
 
 
 def is_constructor_attribute(attribute):
     # FIXME: replace this with [ConstructorAttribute] extended attribute
     return attribute.idl_type.name.endswith('Constructor')
 
 
 def constructor_getter_context(interface, attribute, context):
     context['needs_constructor_getter_callback'] = context['measure_as'] or context['deprecate_as']