Remove unused V8 integration code in Sky

sky/engine/bindings/scripts/v8_types.py

Index: sky/engine/bindings/scripts/v8_types.py
diff --git a/sky/engine/bindings/scripts/v8_types.py b/sky/engine/bindings/scripts/v8_types.py
deleted file mode 100644
index 1e5c803952e41b4b0eb9a3bf83305c85ba156475..0000000000000000000000000000000000000000
--- a/sky/engine/bindings/scripts/v8_types.py
+++ /dev/null
@@ -1,767 +0,0 @@
-# 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.
-
-"""Functions for type handling and type conversion (Blink/C++ <-> V8/JS).
-
-Extends IdlType and IdlUnionType with V8-specific properties, methods, and
-class methods.
-
-Spec:
-http://www.w3.org/TR/WebIDL/#es-type-mapping
-
-Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
-"""
-
-import posixpath
-
-from idl_types import IdlTypeBase, IdlType, IdlUnionType, IdlArrayOrSequenceType, IdlNullableType
-import v8_attributes  # for IdlType.constructor_type_name
-from v8_globals import includes
-
-
-################################################################################
-# V8-specific handling of IDL types
-################################################################################
-
-NON_WRAPPER_TYPES = frozenset([
-    'CompareHow',
-    'Dictionary',
-    'EventHandler',
-    'EventListener',
-    'NodeFilter',
-    'SerializedScriptValue',
-])
-TYPED_ARRAYS = {
-    # (cpp_type, v8_type), used by constructor templates
-    'ArrayBuffer': None,
-    'ArrayBufferView': None,
-    'Float32Array': ('float', 'v8::kExternalFloatArray'),
-    'Float64Array': ('double', 'v8::kExternalDoubleArray'),
-    'Int8Array': ('signed char', 'v8::kExternalByteArray'),
-    'Int16Array': ('short', 'v8::kExternalShortArray'),
-    'Int32Array': ('int', 'v8::kExternalIntArray'),
-    'Uint8Array': ('unsigned char', 'v8::kExternalUnsignedByteArray'),
-    'Uint8ClampedArray': ('unsigned char', 'v8::kExternalPixelArray'),
-    'Uint16Array': ('unsigned short', 'v8::kExternalUnsignedShortArray'),
-    'Uint32Array': ('unsigned int', 'v8::kExternalUnsignedIntArray'),
-}
-
-IdlType.is_typed_array_element_type = property(
-    lambda self: self.base_type in TYPED_ARRAYS)
-
-IdlType.is_wrapper_type = property(
-    lambda self: (self.is_interface_type and
-                  self.base_type not in NON_WRAPPER_TYPES))
-
-
-################################################################################
-# C++ types
-################################################################################
-
-CPP_TYPE_SAME_AS_IDL_TYPE = set([
-    'double',
-    'float',
-    'long long',
-    'unsigned long long',
-])
-CPP_INT_TYPES = set([
-    'byte',
-    'long',
-    'short',
-])
-CPP_UNSIGNED_TYPES = set([
-    'octet',
-    'unsigned int',
-    'unsigned long',
-    'unsigned short',
-])
-CPP_SPECIAL_CONVERSION_RULES = {
-    'CompareHow': 'Range::CompareHow',
-    'Date': 'double',
-    'Dictionary': 'Dictionary',
-    'EventHandler': 'EventListener*',
-    'NodeFilter': 'RefPtr<NodeFilter>',
-    'Promise': 'ScriptPromise',
-    'ScriptValue': 'ScriptValue',
-    'boolean': 'bool',
-    'unrestricted double': 'double',
-    'unrestricted float': 'float',
-}
-
-
-def cpp_type(idl_type, extended_attributes=None, raw_type=False, used_as_rvalue_type=False, used_as_variadic_argument=False, used_in_cpp_sequence=False):
-    """Returns C++ type corresponding to IDL type.
-
-    |idl_type| argument is of type IdlType, while return value is a string
-
-    Args:
-        idl_type:
-            IdlType
-        raw_type:
-            bool, True if idl_type's raw/primitive C++ type should be returned.
-        used_as_rvalue_type:
-            bool, True if the C++ type is used as an argument or the return
-            type of a method.
-        used_as_variadic_argument:
-            bool, True if the C++ type is used as a variadic argument of a method.
-        used_in_cpp_sequence:
-            bool, True if the C++ type is used as an element of a container.
-            Containers can be an array, a sequence or a dictionary.
-    """
-    def string_mode():
-        if extended_attributes.get('TreatNullAs') == 'EmptyString':
-            return 'TreatNullAsEmptyString'
-        if idl_type.is_nullable or extended_attributes.get('TreatNullAs') == 'NullString':
-            if extended_attributes.get('TreatUndefinedAs') == 'NullString':
-                return 'TreatNullAndUndefinedAsNullString'
-            return 'TreatNullAsNullString'
-        return ''
-
-    extended_attributes = extended_attributes or {}
-    idl_type = idl_type.preprocessed_type
-
-    # Array or sequence types
-    if used_as_variadic_argument:
-        native_array_element_type = idl_type
-    else:
-        native_array_element_type = idl_type.native_array_element_type
-    if native_array_element_type:
-        vector_type = 'Vector'
-        vector_template_type = cpp_template_type(vector_type, native_array_element_type.cpp_type_args(used_in_cpp_sequence=True))
-        if used_as_rvalue_type:
-            return 'const %s&' % vector_template_type
-        return vector_template_type
-
-    # Simple types
-    base_idl_type = idl_type.base_type
-
-    if base_idl_type in CPP_TYPE_SAME_AS_IDL_TYPE:
-        return base_idl_type
-    if base_idl_type in CPP_INT_TYPES:
-        return 'int'
-    if base_idl_type in CPP_UNSIGNED_TYPES:
-        return 'unsigned'
-    if base_idl_type in CPP_SPECIAL_CONVERSION_RULES:
-        return CPP_SPECIAL_CONVERSION_RULES[base_idl_type]
-
-    if base_idl_type in NON_WRAPPER_TYPES:
-        return ('PassRefPtr<%s>' if used_as_rvalue_type else 'RefPtr<%s>') % base_idl_type
-    if idl_type.is_string_type:
-        if not raw_type:
-            return 'String'
-        return 'V8StringResource<%s>' % string_mode()
-
-    if idl_type.is_typed_array_element_type and raw_type:
-        return base_idl_type + '*'
-    if idl_type.is_interface_type:
-        implemented_as_class = idl_type.implemented_as
-        if raw_type:
-            return implemented_as_class + '*'
-        new_type = 'Member' if used_in_cpp_sequence else 'RawPtr'
-        ptr_type = ('PassRefPtr' if used_as_rvalue_type else 'RefPtr')
-        return cpp_template_type(ptr_type, implemented_as_class)
-    # Default, assume native type is a pointer with same type name as idl type
-    return base_idl_type + '*'
-
-
-def cpp_type_initializer(idl_type):
-    """Returns a string containing a C++ initialization statement for the
-    corresponding type.
-
-    |idl_type| argument is of type IdlType.
-    """
-
-    base_idl_type = idl_type.base_type
-
-    if idl_type.native_array_element_type:
-        return ''
-    if idl_type.is_numeric_type:
-        return ' = 0'
-    if base_idl_type == 'boolean':
-        return ' = false'
-    if (base_idl_type in NON_WRAPPER_TYPES or
-        base_idl_type in CPP_SPECIAL_CONVERSION_RULES or
-        base_idl_type == 'any' or
-        idl_type.is_string_type or
-        idl_type.is_enum):
-        return ''
-    return ' = nullptr'
-
-
-def cpp_type_union(idl_type, extended_attributes=None, raw_type=False):
-    # FIXME: Need to revisit the design of union support.
-    # http://crbug.com/240176
-    return None
-
-
-def cpp_type_initializer_union(idl_type):
-    return (member_type.cpp_type_initializer for member_type in idl_type.member_types)
-
-
-# Allow access as idl_type.cpp_type if no arguments
-IdlTypeBase.cpp_type = property(cpp_type)
-IdlTypeBase.cpp_type_initializer = property(cpp_type_initializer)
-IdlTypeBase.cpp_type_args = cpp_type
-IdlUnionType.cpp_type = property(cpp_type_union)
-IdlUnionType.cpp_type_initializer = property(cpp_type_initializer_union)
-IdlUnionType.cpp_type_args = cpp_type_union
-
-
-IdlArrayOrSequenceType.native_array_element_type = property(
-    lambda self: self.element_type)
-
-
-def cpp_template_type(template, inner_type):
-    """Returns C++ template specialized to type, with space added if needed."""
-    if inner_type.endswith('>'):
-        format_string = '{template}<{inner_type} >'
-    else:
-        format_string = '{template}<{inner_type}>'
-    return format_string.format(template=template, inner_type=inner_type)
-
-
-def v8_type(interface_name):
-    return 'V8' + interface_name
-
-
-# [ImplementedAs]
-# This handles [ImplementedAs] on interface types, not [ImplementedAs] in the
-# interface being generated. e.g., given:
-#   Foo.idl: interface Foo {attribute Bar bar};
-#   Bar.idl: [ImplementedAs=Zork] interface Bar {};
-# when generating bindings for Foo, the [ImplementedAs] on Bar is needed.
-# This data is external to Foo.idl, and hence computed as global information in
-# compute_interfaces_info.py to avoid having to parse IDLs of all used interfaces.
-IdlType.implemented_as_interfaces = {}
-
-
-def implemented_as(idl_type):
-    base_idl_type = idl_type.base_type
-    if base_idl_type in IdlType.implemented_as_interfaces:
-        return IdlType.implemented_as_interfaces[base_idl_type]
-    return base_idl_type
-
-
-IdlType.implemented_as = property(implemented_as)
-
-IdlType.set_implemented_as_interfaces = classmethod(
-    lambda cls, new_implemented_as_interfaces:
-        cls.implemented_as_interfaces.update(new_implemented_as_interfaces))
-
-
-################################################################################
-# Includes
-################################################################################
-
-def includes_for_cpp_class(class_name, relative_dir_posix):
-    return set([posixpath.join('bindings', relative_dir_posix, class_name + '.h')])
-
-
-INCLUDES_FOR_TYPE = {
-    'object': set(),
-    'CompareHow': set(),
-    'Dictionary': set(['bindings/core/v8/Dictionary.h']),
-    'EventHandler': set(['bindings/core/v8/V8AbstractEventListener.h',
-                         'bindings/core/v8/V8EventListenerList.h']),
-    'EventListener': set(['bindings/core/v8/BindingSecurity.h',
-                          'bindings/core/v8/V8EventListenerList.h',
-                          'core/frame/LocalDOMWindow.h']),
-    'NodeList': set(['bindings/core/v8/V8NodeList.h',
-                     'core/dom/NodeList.h',
-                     'core/dom/StaticNodeList.h']),
-    'Promise': set(['bindings/core/v8/ScriptPromise.h']),
-    'SerializedScriptValue': set(['bindings/core/v8/SerializedScriptValue.h']),
-    'ScriptValue': set(['bindings/core/v8/ScriptValue.h']),
-}
-
-
-def includes_for_type(idl_type):
-    idl_type = idl_type.preprocessed_type
-
-    # Simple types
-    base_idl_type = idl_type.base_type
-    if base_idl_type in INCLUDES_FOR_TYPE:
-        return INCLUDES_FOR_TYPE[base_idl_type]
-    if idl_type.is_basic_type:
-        return set()
-    if idl_type.is_typed_array_element_type:
-        return set(['bindings/core/v8/custom/V8%sCustom.h' % base_idl_type])
-    if base_idl_type.endswith('ConstructorConstructor'):
-        # FIXME: rename to NamedConstructor
-        # FIXME: replace with a [NamedConstructorAttribute] extended attribute
-        # Ending with 'ConstructorConstructor' indicates a named constructor,
-        # and these do not have header files, as they are part of the generated
-        # bindings for the interface
-        return set()
-    if base_idl_type.endswith('Constructor'):
-        # FIXME: replace with a [ConstructorAttribute] extended attribute
-        base_idl_type = idl_type.constructor_type_name
-    if base_idl_type not in component_dir:
-        return set()
-    return set(['bindings/%s/v8/V8%s.h' % (component_dir[base_idl_type],
-                                           base_idl_type)])
-
-IdlType.includes_for_type = property(includes_for_type)
-IdlUnionType.includes_for_type = property(
-    lambda self: set.union(*[member_type.includes_for_type
-                             for member_type in self.member_types]))
-IdlArrayOrSequenceType.includes_for_type = property(
-    lambda self: self.element_type.includes_for_type)
-
-
-def add_includes_for_type(idl_type):
-    includes.update(idl_type.includes_for_type)
-
-IdlTypeBase.add_includes_for_type = add_includes_for_type
-
-
-def includes_for_interface(interface_name):
-    return IdlType(interface_name).includes_for_type
-
-
-def add_includes_for_interface(interface_name):
-    includes.update(includes_for_interface(interface_name))
-
-
-def impl_should_use_nullable_container(idl_type):
-    return not(idl_type.cpp_type_has_null_value)
-
-IdlTypeBase.impl_should_use_nullable_container = property(
-    impl_should_use_nullable_container)
-
-
-def impl_includes_for_type(idl_type, interfaces_info):
-    includes_for_type = set()
-    if idl_type.impl_should_use_nullable_container:
-        includes_for_type.add('bindings/core/v8/Nullable.h')
-
-    idl_type = idl_type.preprocessed_type
-    native_array_element_type = idl_type.native_array_element_type
-    if native_array_element_type:
-        includes_for_type.update(impl_includes_for_type(
-                native_array_element_type, interfaces_info))
-        includes_for_type.add('wtf/Vector.h')
-
-    if idl_type.is_string_type:
-        includes_for_type.add('wtf/text/WTFString.h')
-    if idl_type.name in interfaces_info:
-        interface_info = interfaces_info[idl_type.name]
-        includes_for_type.add(interface_info['include_path'])
-    return includes_for_type
-
-IdlTypeBase.impl_includes_for_type = impl_includes_for_type
-
-
-component_dir = {}
-
-
-def set_component_dirs(new_component_dirs):
-    component_dir.update(new_component_dirs)
-
-
-################################################################################
-# V8 -> C++
-################################################################################
-
-V8_VALUE_TO_CPP_VALUE = {
-    # Basic
-    'Date': 'toCoreDate({v8_value})',
-    'DOMString': '{v8_value}',
-    'ByteString': 'toByteString({arguments})',
-    'ScalarValueString': 'toScalarValueString({arguments})',
-    'boolean': '{v8_value}->BooleanValue()',
-    'float': 'static_cast<float>({v8_value}->NumberValue())',
-    'unrestricted float': 'static_cast<float>({v8_value}->NumberValue())',
-    'double': 'static_cast<double>({v8_value}->NumberValue())',
-    'unrestricted double': 'static_cast<double>({v8_value}->NumberValue())',
-    'byte': 'toInt8({arguments})',
-    'octet': 'toUInt8({arguments})',
-    'short': 'toInt16({arguments})',
-    'unsigned short': 'toUInt16({arguments})',
-    'long': 'toInt32({arguments})',
-    'unsigned long': 'toUInt32({arguments})',
-    'long long': 'toInt64({arguments})',
-    'unsigned long long': 'toUInt64({arguments})',
-    # Interface types
-    'CompareHow': 'static_cast<Range::CompareHow>({v8_value}->Int32Value())',
-    'Dictionary': 'Dictionary({v8_value}, {isolate})',
-    'EventTarget': 'V8DOMWrapper::isDOMWrapper({v8_value}) ? toWrapperTypeInfo(v8::Handle<v8::Object>::Cast({v8_value}))->toEventTarget(v8::Handle<v8::Object>::Cast({v8_value})) : 0',
-    'NodeFilter': 'toNodeFilter({v8_value}, info.Holder(), ScriptState::current({isolate}))',
-    'Promise': 'ScriptPromise::cast(ScriptState::current({isolate}), {v8_value})',
-    'SerializedScriptValue': 'SerializedScriptValue::create({v8_value}, {isolate})',
-    'ScriptValue': 'ScriptValue(ScriptState::current({isolate}), {v8_value})',
-    'Window': 'toDOMWindow({v8_value}, {isolate})',
-}
-
-
-def v8_value_to_cpp_value(idl_type, extended_attributes, v8_value, index, isolate):
-    if idl_type.name == 'void':
-        return ''
-
-    # Array or sequence types
-    native_array_element_type = idl_type.native_array_element_type
-    if native_array_element_type:
-        return v8_value_to_cpp_value_array_or_sequence(native_array_element_type, v8_value, index)
-
-    # Simple types
-    idl_type = idl_type.preprocessed_type
-    add_includes_for_type(idl_type)
-    base_idl_type = idl_type.base_type
-
-    if 'EnforceRange' in extended_attributes:
-        arguments = ', '.join([v8_value, 'EnforceRange', 'exceptionState'])
-    elif idl_type.may_raise_exception_on_conversion:
-        arguments = ', '.join([v8_value, 'exceptionState'])
-    else:
-        arguments = v8_value
-
-    if base_idl_type in V8_VALUE_TO_CPP_VALUE:
-        cpp_expression_format = V8_VALUE_TO_CPP_VALUE[base_idl_type]
-    elif idl_type.is_typed_array_element_type:
-        cpp_expression_format = (
-            '{v8_value}->Is{idl_type}() ? '
-            'V8{idl_type}::toNative(v8::Handle<v8::{idl_type}>::Cast({v8_value})) : 0')
-    elif idl_type.is_dictionary:
-        cpp_expression_format = 'V8{idl_type}::toNative({isolate}, {v8_value})'
-    else:
-        cpp_expression_format = (
-            'V8{idl_type}::toNativeWithTypeCheck({isolate}, {v8_value})')
-
-    return cpp_expression_format.format(arguments=arguments, idl_type=base_idl_type, v8_value=v8_value, isolate=isolate)
-
-
-def v8_value_to_cpp_value_array_or_sequence(native_array_element_type, v8_value, index, isolate='info.GetIsolate()'):
-    # Index is None for setters, index (starting at 0) for method arguments,
-    # and is used to provide a human-readable exception message
-    if index is None:
-        index = 0  # special case, meaning "setter"
-    else:
-        index += 1  # human-readable index
-    if (native_array_element_type.is_interface_type and
-        native_array_element_type.name != 'Dictionary'):
-        this_cpp_type = None
-        ref_ptr_type = 'RefPtr'
-        expression_format = '(to{ref_ptr_type}NativeArray<{native_array_element_type}, V8{native_array_element_type}>({v8_value}, {index}, {isolate}))'
-        add_includes_for_type(native_array_element_type)
-    else:
-        ref_ptr_type = None
-        this_cpp_type = native_array_element_type.cpp_type
-        expression_format = 'toNativeArray<{cpp_type}>({v8_value}, {index}, {isolate})'
-    expression = expression_format.format(native_array_element_type=native_array_element_type.name, cpp_type=this_cpp_type, index=index, ref_ptr_type=ref_ptr_type, v8_value=v8_value, isolate=isolate)
-    return expression
-
-
-def v8_value_to_local_cpp_value(idl_type, extended_attributes, v8_value, variable_name, index=None, declare_variable=True, isolate='info.GetIsolate()', used_in_private_script=False, return_promise=False):
-    """Returns an expression that converts a V8 value to a C++ value and stores it as a local value."""
-
-    # FIXME: Support union type.
-    if idl_type.is_union_type:
-        return ''
-
-    this_cpp_type = idl_type.cpp_type_args(extended_attributes=extended_attributes, raw_type=True)
-
-    idl_type = idl_type.preprocessed_type
-    cpp_value = v8_value_to_cpp_value(idl_type, extended_attributes, v8_value, index, isolate)
-    args = [variable_name, cpp_value]
-    if idl_type.base_type == 'DOMString':
-        macro = 'TOSTRING_DEFAULT' if used_in_private_script else 'TOSTRING_VOID'
-    elif idl_type.may_raise_exception_on_conversion:
-        macro = 'TONATIVE_DEFAULT_EXCEPTIONSTATE' if used_in_private_script else 'TONATIVE_VOID_EXCEPTIONSTATE'
-        args.append('exceptionState')
-    else:
-        macro = 'TONATIVE_DEFAULT' if used_in_private_script else 'TONATIVE_VOID'
-
-    if used_in_private_script:
-        args.append('false')
-
-    # Macros come in several variants, to minimize expensive creation of
-    # v8::TryCatch.
-    suffix = ''
-
-    if return_promise:
-        suffix += '_PROMISE'
-        args.append('info')
-        if macro == 'TONATIVE_VOID_EXCEPTIONSTATE':
-            args.append('ScriptState::current(%s)' % isolate)
-
-    if declare_variable:
-        args.insert(0, this_cpp_type)
-    else:
-        suffix += '_INTERNAL'
-
-    return '%s(%s)' % (macro + suffix, ', '.join(args))
-
-IdlTypeBase.v8_value_to_local_cpp_value = v8_value_to_local_cpp_value
-
-
-################################################################################
-# C++ -> V8
-################################################################################
-
-def preprocess_idl_type(idl_type):
-    if idl_type.is_enum:
-        # Enumerations are internally DOMStrings
-        return IdlType('DOMString')
-    if (idl_type.name == 'Any' or idl_type.is_callback_function):
-        return IdlType('ScriptValue')
-    return idl_type
-
-IdlTypeBase.preprocessed_type = property(preprocess_idl_type)
-
-
-def preprocess_idl_type_and_value(idl_type, cpp_value, extended_attributes):
-    """Returns IDL type and value, with preliminary type conversions applied."""
-    idl_type = idl_type.preprocessed_type
-    if idl_type.name == 'Promise':
-        idl_type = IdlType('ScriptValue')
-    if idl_type.base_type in ['long long', 'unsigned long long']:
-        # long long and unsigned long long are not representable in ECMAScript;
-        # we represent them as doubles.
-        is_nullable = idl_type.is_nullable
-        idl_type = IdlType('double')
-        if is_nullable:
-            idl_type = IdlNullableType(idl_type)
-        cpp_value = 'static_cast<double>(%s)' % cpp_value
-    # HTML5 says that unsigned reflected attributes should be in the range
-    # [0, 2^31). When a value isn't in this range, a default value (or 0)
-    # should be returned instead.
-    extended_attributes = extended_attributes or {}
-    if ('Reflect' in extended_attributes and
-        idl_type.base_type in ['unsigned long', 'unsigned short']):
-        cpp_value = cpp_value.replace('getUnsignedIntegralAttribute',
-                                      'getIntegralAttribute')
-        cpp_value = 'std::max(0, static_cast<int>(%s))' % cpp_value
-    return idl_type, cpp_value
-
-
-def v8_conversion_type(idl_type, extended_attributes):
-    """Returns V8 conversion type, adding any additional includes.
-
-    The V8 conversion type is used to select the C++ -> V8 conversion function
-    or v8SetReturnValue* function; it can be an idl_type, a cpp_type, or a
-    separate name for the type of conversion (e.g., 'DOMWrapper').
-    """
-    extended_attributes = extended_attributes or {}
-
-    # FIXME: Support union type.
-    if idl_type.is_union_type:
-        return ''
-
-    # Array or sequence types
-    native_array_element_type = idl_type.native_array_element_type
-    if native_array_element_type:
-        if native_array_element_type.is_interface_type:
-            add_includes_for_type(native_array_element_type)
-        return 'array'
-
-    # Simple types
-    base_idl_type = idl_type.base_type
-    # Basic types, without additional includes
-    if base_idl_type in CPP_INT_TYPES:
-        return 'int'
-    if base_idl_type in CPP_UNSIGNED_TYPES:
-        return 'unsigned'
-    if idl_type.is_string_type:
-        if idl_type.is_nullable:
-            return 'StringOrNull'
-        if 'TreatReturnedNullStringAs' not in extended_attributes:
-            return base_idl_type
-        treat_returned_null_string_as = extended_attributes['TreatReturnedNullStringAs']
-        if treat_returned_null_string_as == 'Null':
-            return 'StringOrNull'
-        if treat_returned_null_string_as == 'Undefined':
-            return 'StringOrUndefined'
-        raise 'Unrecognized TreatReturnedNullStringAs value: "%s"' % treat_returned_null_string_as
-    if idl_type.is_basic_type or base_idl_type == 'ScriptValue':
-        return base_idl_type
-
-    # Data type with potential additional includes
-    add_includes_for_type(idl_type)
-    if base_idl_type in V8_SET_RETURN_VALUE:  # Special v8SetReturnValue treatment
-        return base_idl_type
-
-    # Pointer type
-    return 'DOMWrapper'
-
-IdlTypeBase.v8_conversion_type = v8_conversion_type
-
-
-V8_SET_RETURN_VALUE = {
-    'boolean': 'v8SetReturnValueBool(info, {cpp_value})',
-    'int': 'v8SetReturnValueInt(info, {cpp_value})',
-    'unsigned': 'v8SetReturnValueUnsigned(info, {cpp_value})',
-    'DOMString': 'v8SetReturnValueString(info, {cpp_value}, info.GetIsolate())',
-    'ByteString': 'v8SetReturnValueString(info, {cpp_value}, info.GetIsolate())',
-    'ScalarValueString': 'v8SetReturnValueString(info, {cpp_value}, info.GetIsolate())',
-    # [TreatReturnedNullStringAs]
-    'StringOrNull': 'v8SetReturnValueStringOrNull(info, {cpp_value}, info.GetIsolate())',
-    'StringOrUndefined': 'v8SetReturnValueStringOrUndefined(info, {cpp_value}, info.GetIsolate())',
-    'void': '',
-    # No special v8SetReturnValue* function (set value directly)
-    'float': 'v8SetReturnValue(info, {cpp_value})',
-    'unrestricted float': 'v8SetReturnValue(info, {cpp_value})',
-    'double': 'v8SetReturnValue(info, {cpp_value})',
-    'unrestricted double': 'v8SetReturnValue(info, {cpp_value})',
-    # No special v8SetReturnValue* function, but instead convert value to V8
-    # and then use general v8SetReturnValue.
-    'array': 'v8SetReturnValue(info, {cpp_value})',
-    'Date': 'v8SetReturnValue(info, {cpp_value})',
-    'EventHandler': 'v8SetReturnValue(info, {cpp_value})',
-    'ScriptValue': 'v8SetReturnValue(info, {cpp_value})',
-    'SerializedScriptValue': 'v8SetReturnValue(info, {cpp_value})',
-    # DOMWrapper
-    'DOMWrapperForMainWorld': 'v8SetReturnValueForMainWorld(info, WTF::getPtr({cpp_value}))',
-    'DOMWrapperFast': 'v8SetReturnValueFast(info, WTF::getPtr({cpp_value}), {script_wrappable})',
-    'DOMWrapperDefault': 'v8SetReturnValue(info, {cpp_value})',
-}
-
-
-def v8_set_return_value(idl_type, cpp_value, extended_attributes=None, script_wrappable='', release=False, for_main_world=False):
-    """Returns a statement that converts a C++ value to a V8 value and sets it as a return value.
-
-    """
-    def dom_wrapper_conversion_type():
-        if not script_wrappable:
-            return 'DOMWrapperDefault'
-        if for_main_world:
-            return 'DOMWrapperForMainWorld'
-        return 'DOMWrapperFast'
-
-    idl_type, cpp_value = preprocess_idl_type_and_value(idl_type, cpp_value, extended_attributes)
-    this_v8_conversion_type = idl_type.v8_conversion_type(extended_attributes)
-    # SetReturn-specific overrides
-    if this_v8_conversion_type in ['Date', 'EventHandler', 'ScriptValue', 'SerializedScriptValue', 'array']:
-        # Convert value to V8 and then use general v8SetReturnValue
-        cpp_value = idl_type.cpp_value_to_v8_value(cpp_value, extended_attributes=extended_attributes)
-    if this_v8_conversion_type == 'DOMWrapper':
-        this_v8_conversion_type = dom_wrapper_conversion_type()
-
-    format_string = V8_SET_RETURN_VALUE[this_v8_conversion_type]
-    # FIXME: oilpan: Remove .release() once we remove all RefPtrs from generated code.
-    if release:
-        cpp_value = '%s.release()' % cpp_value
-    statement = format_string.format(cpp_value=cpp_value, script_wrappable=script_wrappable)
-    return statement
-
-
-def v8_set_return_value_union(idl_type, cpp_value, extended_attributes=None, script_wrappable='', release=False, for_main_world=False):
-    # FIXME: Need to revisit the design of union support.
-    # http://crbug.com/240176
-    return None
-
-
-IdlTypeBase.v8_set_return_value = v8_set_return_value
-IdlUnionType.v8_set_return_value = v8_set_return_value_union
-
-IdlType.release = property(lambda self: self.is_interface_type)
-IdlUnionType.release = property(
-    lambda self: [member_type.is_interface_type
-                  for member_type in self.member_types])
-
-
-CPP_VALUE_TO_V8_VALUE = {
-    # Built-in types
-    'Date': 'v8DateOrNaN({cpp_value}, {isolate})',
-    'DOMString': 'v8String({isolate}, {cpp_value})',
-    'ByteString': 'v8String({isolate}, {cpp_value})',
-    'ScalarValueString': 'v8String({isolate}, {cpp_value})',
-    'boolean': 'v8Boolean({cpp_value}, {isolate})',
-    'int': 'v8::Integer::New({isolate}, {cpp_value})',
-    'unsigned': 'v8::Integer::NewFromUnsigned({isolate}, {cpp_value})',
-    'float': 'v8::Number::New({isolate}, {cpp_value})',
-    'unrestricted float': 'v8::Number::New({isolate}, {cpp_value})',
-    'double': 'v8::Number::New({isolate}, {cpp_value})',
-    'unrestricted double': 'v8::Number::New({isolate}, {cpp_value})',
-    'void': 'v8Undefined()',
-    # [TreatReturnedNullStringAs]
-    'StringOrNull': '{cpp_value}.isNull() ? v8::Handle<v8::Value>(v8::Null({isolate})) : v8String({isolate}, {cpp_value})',
-    'StringOrUndefined': '{cpp_value}.isNull() ? v8Undefined() : v8String({isolate}, {cpp_value})',
-    # Special cases
-    'EventHandler': '{cpp_value} ? v8::Handle<v8::Value>(V8AbstractEventListener::cast({cpp_value})->getListenerObject(impl->executionContext())) : v8::Handle<v8::Value>(v8::Null({isolate}))',
-    'ScriptValue': '{cpp_value}.v8Value()',
-    'SerializedScriptValue': '{cpp_value} ? {cpp_value}->deserialize() : v8::Handle<v8::Value>(v8::Null({isolate}))',
-    # General
-    'array': 'v8Array({cpp_value}, {creation_context}, {isolate})',
-    'DOMWrapper': 'toV8({cpp_value}, {creation_context}, {isolate})',
-}
-
-
-def cpp_value_to_v8_value(idl_type, cpp_value, isolate='info.GetIsolate()', creation_context='info.Holder()', extended_attributes=None):
-    """Returns an expression that converts a C++ value to a V8 value."""
-    # the isolate parameter is needed for callback interfaces
-    idl_type, cpp_value = preprocess_idl_type_and_value(idl_type, cpp_value, extended_attributes)
-    this_v8_conversion_type = idl_type.v8_conversion_type(extended_attributes)
-    format_string = CPP_VALUE_TO_V8_VALUE[this_v8_conversion_type]
-    statement = format_string.format(cpp_value=cpp_value, isolate=isolate, creation_context=creation_context)
-    return statement
-
-IdlTypeBase.cpp_value_to_v8_value = cpp_value_to_v8_value
-
-
-def literal_cpp_value(idl_type, idl_literal):
-    """Converts an expression that is a valid C++ literal for this type."""
-    # FIXME: add validation that idl_type and idl_literal are compatible
-    literal_value = str(idl_literal)
-    if idl_type.base_type in CPP_UNSIGNED_TYPES:
-        return literal_value + 'u'
-    return literal_value
-
-IdlType.literal_cpp_value = literal_cpp_value
-
-
-################################################################################
-# Utility properties for nullable types
-################################################################################
-
-
-def cpp_type_has_null_value(idl_type):
-    # - String types (String/AtomicString) represent null as a null string,
-    #   i.e. one for which String::isNull() returns true.
-    # - Wrapper types (raw pointer or RefPtr/PassRefPtr) represent null as
-    #   a null pointer.
-    # - Dictionary types represent null as a null pointer. They are garbage
-    #   collected so their type is raw pointer.
-    return (idl_type.is_string_type or idl_type.is_wrapper_type or
-            idl_type.is_dictionary)
-
-IdlTypeBase.cpp_type_has_null_value = property(cpp_type_has_null_value)
-
-
-def is_implicit_nullable(idl_type):
-    # Nullable type where the corresponding C++ type supports a null value.
-    return idl_type.is_nullable and idl_type.cpp_type_has_null_value
-
-
-def is_explicit_nullable(idl_type):
-    # Nullable type that isn't implicit nullable (see above.) For such types,
-    # we use Nullable<T> or similar explicit ways to represent a null value.
-    return idl_type.is_nullable and not idl_type.is_implicit_nullable
-
-IdlTypeBase.is_implicit_nullable = property(is_implicit_nullable)
-IdlUnionType.is_implicit_nullable = False
-IdlTypeBase.is_explicit_nullable = property(is_explicit_nullable)