Move IDLs to 39 roll

bindings/scripts/v8_types.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 21 matching lines @@
 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
+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',
-    'MediaQueryListListener',
     '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'),
 }
 
-IdlTypeBase.is_typed_array_element_type = False
 IdlType.is_typed_array_element_type = property(
     lambda self: self.base_type in TYPED_ARRAYS)
 
-
-IdlTypeBase.is_wrapper_type = False
 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*',
-    'MediaQueryListListener': 'RefPtrWillBeRawPtr<MediaQueryListListener>',
     'NodeFilter': 'RefPtrWillBeRawPtr<NodeFilter>',
     'Promise': 'ScriptPromise',
     'ScriptValue': 'ScriptValue',
     # FIXME: Eliminate custom bindings for XPathNSResolver  http://crbug.com/345529
     'XPathNSResolver': 'RefPtrWillBeRawPtr<XPathNSResolver>',
     'boolean': 'bool',
     'unrestricted double': 'double',
     'unrestricted float': 'float',
 }
 
@@ skipping 73 matching lines @@
     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.
     """
 
-    if (idl_type.is_numeric_type):
+    base_idl_type = idl_type.base_type
+
+    if idl_type.native_array_element_type:
+        return ''
+    if idl_type.is_numeric_type:
         return ' = 0'
-    if idl_type.base_type == 'boolean':
+    if base_idl_type == 'boolean':
         return ' = false'
     if idl_type.base_type == 'Promise':
         return '(nullptr)'
-    return ''
+
+    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
 
 
-IdlTypeBase.native_array_element_type = None
 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}>'
@@ skipping 35 matching lines @@
 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))
 
 
 # [GarbageCollected]
 IdlType.garbage_collected_types = set()
 
-IdlTypeBase.is_garbage_collected = False
 IdlType.is_garbage_collected = property(
     lambda self: self.base_type in IdlType.garbage_collected_types)
 
 IdlType.set_garbage_collected_types = classmethod(
     lambda cls, new_garbage_collected_types:
         cls.garbage_collected_types.update(new_garbage_collected_types))
 
 
 # [WillBeGarbageCollected]
 IdlType.will_be_garbage_collected_types = set()
 
-IdlTypeBase.is_will_be_garbage_collected = False
 IdlType.is_will_be_garbage_collected = property(
     lambda self: self.base_type in IdlType.will_be_garbage_collected_types)
 
 IdlType.set_will_be_garbage_collected_types = classmethod(
     lambda cls, new_will_be_garbage_collected_types:
         cls.will_be_garbage_collected_types.update(new_will_be_garbage_collected_types))
 
 
 def gc_type(idl_type):
     if idl_type.is_garbage_collected:
         return 'GarbageCollectedObject'
     if idl_type.is_will_be_garbage_collected:
         return 'WillBeGarbageCollectedObject'
     return 'RefCountedObject'
 
 IdlTypeBase.gc_type = property(gc_type)
 
 
 ################################################################################
 # 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/common/BindingSecurity.h',
                           'bindings/core/v8/V8EventListenerList.h',
                           'core/frame/LocalDOMWindow.h']),
     'HTMLCollection': set(['bindings/core/v8/V8HTMLCollection.h',
                            'core/dom/ClassCollection.h',
                            'core/dom/TagCollection.h',
                            'core/html/HTMLCollection.h',
+                           'core/html/HTMLDataListOptionsCollection.h',
                            'core/html/HTMLFormControlsCollection.h',
                            'core/html/HTMLTableRowsCollection.h']),
-    'MediaQueryListListener': set(['core/css/MediaQueryListListener.h']),
     'NodeList': set(['bindings/core/v8/V8NodeList.h',
                      'core/dom/NameNodeList.h',
                      'core/dom/NodeList.h',
                      'core/dom/StaticNodeList.h',
                      'core/html/LabelsNodeList.h']),
     'Promise': set(['bindings/core/v8/V8ScriptPromise.h']),
     'SerializedScriptValue': set(['bindings/core/v8/SerializedScriptValue.h']),
     'ScriptValue': set(['bindings/common/ScriptValue.h']),
 }
 
@@ skipping 19 matching lines @@
     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(*[includes_for_type(member_type)
+    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
 
@@ skipping 18 matching lines @@
     if idl_type.impl_should_use_nullable_container:
         includes_for_type.add('bindings/common/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')
 
+    base_idl_type = idl_type.base_type
     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]
+    if base_idl_type in interfaces_info:
+        interface_info = interfaces_info[idl_type.base_type]
         includes_for_type.add(interface_info['include_path'])
+    if base_idl_type in INCLUDES_FOR_TYPE:
+        includes_for_type.update(INCLUDES_FOR_TYPE[base_idl_type])
     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())',
+    'float': 'toFloat({arguments})',
+    'unrestricted float': 'toFloat({arguments})',
+    'double': 'toDouble({arguments})',
+    'unrestricted double': 'toDouble({arguments})',
     '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',
-    'MediaQueryListListener': 'MediaQueryListListener::create(V8ScriptState::current({isolate}), ScriptValue(V8ScriptState::current({isolate}), {v8_value}))',
     'NodeFilter': 'toNodeFilter({v8_value}, info.Holder(), V8ScriptState::current({isolate}))',
     'Promise': 'V8ScriptPromise::cast(V8ScriptState::current({isolate}), {v8_value})',
-    'SerializedScriptValue': 'SerializedScriptValue::create({v8_value}, {isolate})',
+    'SerializedScriptValue': 'SerializedScriptValue::create({v8_value}, 0, 0, exceptionState, {isolate})',
     'ScriptValue': 'ScriptValue(V8ScriptState::current({isolate}), {v8_value})',
     'Window': 'toDOMWindow({v8_value}, {isolate})',
     'XPathNSResolver': 'toXPathNSResolver({v8_value}, {isolate})',
 }
 
 
+def v8_conversion_needs_exception_state(idl_type):
+    return (idl_type.is_numeric_type or
+            idl_type.is_dictionary or
+            idl_type.name in ('ByteString', 'ScalarValueString', 'SerializedScriptValue'))
+
+IdlType.v8_conversion_needs_exception_state = property(v8_conversion_needs_exception_state)
+IdlArrayOrSequenceType.v8_conversion_needs_exception_state = True
+
+
+TRIVIAL_CONVERSIONS = frozenset([
+    'any',
+    'boolean',
+    'Date',
+    'Dictionary',
+    'NodeFilter',
+    'XPathNSResolver',
+    'Promise'
+])
+
+
+def v8_conversion_is_trivial(idl_type):
+    # The conversion is a simple expression that returns the converted value and
+    # cannot raise an exception.
+    return (idl_type.base_type in TRIVIAL_CONVERSIONS or
+            idl_type.is_wrapper_type)
+
+IdlType.v8_conversion_is_trivial = property(v8_conversion_is_trivial)
+
+
 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:
+    elif 'Clamp' in extended_attributes:
+        arguments = ', '.join([v8_value, 'Clamp', 'exceptionState'])
+    elif idl_type.v8_conversion_needs_exception_state:
         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')
+            'V8{idl_type}::toImpl(v8::Handle<v8::{idl_type}>::Cast({v8_value})) : 0')
     elif idl_type.is_dictionary:
-        cpp_expression_format = 'V8{idl_type}::toNative({isolate}, {v8_value})'
+        cpp_expression_format = 'V8{idl_type}::toImpl({isolate}, {v8_value}, exceptionState)'
     else:
         cpp_expression_format = (
-            'V8{idl_type}::toNativeWithTypeCheck({isolate}, {v8_value})')
+            'V8{idl_type}::toImplWithTypeCheck({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 = cpp_ptr_type('RefPtr', 'Member', native_array_element_type.gc_type)
-        expression_format = '(to{ref_ptr_type}NativeArray<{native_array_element_type}, V8{native_array_element_type}>({v8_value}, {index}, {isolate}))'
+        expression_format = '(to{ref_ptr_type}NativeArray<{native_array_element_type}, V8{native_array_element_type}>({v8_value}, {index}, {isolate}, exceptionState))'
         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_format = 'toImplArray<{cpp_type}>({v8_value}, {index}, {isolate}, exceptionState)'
     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 ''
+        return '/* no V8 -> C++ conversion for IDL union type: %s */' % idl_type.name
 
     this_cpp_type = idl_type.cpp_type_args(extended_attributes=extended_attributes, raw_type=True)
+    idl_type = idl_type.preprocessed_type
 
-    idl_type = idl_type.preprocessed_type
+    if idl_type.base_type in ('void', 'object', 'EventHandler', 'EventListener'):
+        return '/* no V8 -> C++ conversion for IDL type: %s */' % idl_type.name
+
     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 idl_type.is_string_type or idl_type.v8_conversion_needs_exception_state:
+        # Types that need error handling and use one of a group of (C++) macros
+        # to take care of this.
 
-    if used_in_private_script:
-        args.append('false')
+        args = [variable_name, cpp_value]
 
-    # Macros come in several variants, to minimize expensive creation of
-    # v8::TryCatch.
-    suffix = ''
+        if idl_type.v8_conversion_needs_exception_state:
+            macro = 'TONATIVE_DEFAULT_EXCEPTIONSTATE' if used_in_private_script else 'TONATIVE_VOID_EXCEPTIONSTATE'
+        elif return_promise:
+            macro = 'TOSTRING_VOID_EXCEPTIONSTATE'
+        else:
+            macro = 'TOSTRING_DEFAULT' if used_in_private_script else 'TOSTRING_VOID'
 
-    if return_promise:
-        suffix += '_PROMISE'
-        args.append('info')
-        if macro == 'TONATIVE_VOID_EXCEPTIONSTATE':
-            args.append('V8ScriptState::current(%s)' % isolate)
+        if macro.endswith('_EXCEPTIONSTATE'):
+            args.append('exceptionState')
 
+        if used_in_private_script:
+            args.append('false')
+
+        suffix = ''
+
+        if return_promise:
+            suffix += '_PROMISE'
+            args.append('info')
+            if macro.endswith('_EXCEPTIONSTATE'):
+                args.append('V8ScriptState::current(%s)' % isolate)
+
+        if declare_variable:
+            args.insert(0, this_cpp_type)
+        else:
+            suffix += '_INTERNAL'
+
+        return '%s(%s)' % (macro + suffix, ', '.join(args))
+
+    # Types that don't need error handling, and simply assign a value to the
+    # local variable.
+
+    if not idl_type.v8_conversion_is_trivial:
+        raise Exception('unclassified V8 -> C++ conversion for IDL type: %s' % idl_type.name)
+
+    assignment = '%s = %s' % (variable_name, cpp_value)
     if declare_variable:
-        args.insert(0, this_cpp_type)
-    else:
-        suffix += '_INTERNAL'
+        return '%s %s' % (this_cpp_type, assignment)
+    return assignment
 
-    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):
+    if (idl_type.name in ['Any', 'Object'] 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.
-        idl_type = IdlType('double', is_nullable=idl_type.is_nullable)
+        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
@@ skipping 116 matching lines @@
     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])
-IdlArrayOrSequenceType.release = False
 
 
 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})',
@@ skipping 40 matching lines @@
 
 
 ################################################################################
 # 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.
+    # - Enum types, as they are implemented as Strings.
     # - Wrapper types (raw pointer or RefPtr/PassRefPtr) represent null as
     #   a null pointer.
-    return idl_type.is_string_type or idl_type.is_wrapper_type
+    # - Dictionary types represent null as a null pointer. They are garbage
+    #   collected so their type is raw pointer.
+    # - 'Object' type. We use ScriptValue for object type.
+    return (idl_type.is_string_type or idl_type.is_wrapper_type or
+            idl_type.is_enum or idl_type.is_dictionary or idl_type.base_type == 'object')
 
 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)