src/cobalt/bindings/javascriptcore/templates/prototype-object.template

{#
 # Copyright 2016 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #}
// Class that defines a JS Object representing this interface's prototype
class {{binding_class}}::Prototype : public PrototypeBase {
 public:
  // Get the prototype. Will create a new prototype if necessary, otherwise it
  // will return a cached prototype.
  static JSC::JSObject* GetInstance(JSC::JSGlobalObject* global_object);
  DECLARE_CLASSINFO();

  // Needed when JSC::OverridesGetOwnPropertySlot StructureFlag is set
  // Must be public so that it can be accessible from getStaticValueSlot<>.
  static bool getOwnPropertySlot(JSC::JSCell*, JSC::ExecState*,
                                 JSC::PropertyName,
                                 JSC::PropertySlot&);

 private:
  typedef PrototypeBase BaseClass;

  static const unsigned StructureFlags =
      JSC::OverridesGetOwnPropertySlot |
      BaseClass::StructureFlags;

  Prototype(JSC::JSGlobalObject* global_object, JSC::Structure* structure)
      : BaseClass(global_object, structure) { }

{% if has_interface_object %}
  static JSC::JSValue GetConstructor(JSC::ExecState* exec_state,
      JSC::JSValue slot_base,
      JSC::PropertyName property_name);
{% endif %}
  static const JSC::HashTable* GetPropertyTable(JSC::ExecState* exec_state);

  static const JSC::HashTableValue property_table_values[];
  static const JSC::HashTable property_table_prototype;
};

const JSC::HashTableValue {{binding_class}}::Prototype::property_table_values[] = {
{% for operation in operations if not is_global_interface %}
{% if operation.conditional %}
#if defined({{operation.conditional}})
{% endif %}
    { "{{operation.idl_name}}",
        JSC::DontDelete | JSC::Function,
        reinterpret_cast<intptr_t>(functionJS{{operation.idl_name}}),
        static_cast<intptr_t>({{operation.length}}),
        JSC::NoIntrinsic
    },
{% if operation.conditional %}
#endif  // defined({{operation.conditional}})
{% endif %}
{% endfor %}
{% if stringifier %}
    { "toString",
        JSC::DontDelete | JSC::Function,
        reinterpret_cast<intptr_t>(StringifierJS),
        static_cast<intptr_t>(0),
        JSC::NoIntrinsic
    },
{% endif %}
{% for constant in constants %}
    { "{{constant.idl_name}}",
        JSC::DontDelete | JSC::ReadOnly,
        reinterpret_cast<intptr_t>(getJS{{constant.idl_name}}),
        0,
        JSC::NoIntrinsic
    },
{% endfor %}
{% if has_interface_object %}
    { "constructor",
        JSC::DontDelete | JSC::DontEnum,
        reinterpret_cast<intptr_t>({{binding_class}}::Prototype::GetConstructor),
        static_cast<intptr_t>(0),
        JSC::NoIntrinsic
    },
{% endif %}
    { 0, 0, 0, 0, static_cast<JSC::Intrinsic>(0) }
};  // {{binding_class}}::Prototype::property_table_values

// static
const JSC::HashTable {{binding_class}}::Prototype::property_table_prototype = {
{% set num_prototype_properties = constants|length %}
{% if not is_global_interface %}
{% set num_prototype_properties = num_prototype_properties + operations|length %}
{% endif %}
{% if has_interface_object %}
{% set num_prototype_properties = num_prototype_properties + 1 %}
{% endif %}
{% if stringifier %}
{% set num_prototype_properties = num_prototype_properties + 1 %}
{% endif %}
    {{ calculate_jsc_lookup_size(num_prototype_properties) }},  // compactSize
    {{ calculate_jsc_lookup_size_mask(num_prototype_properties) }},  // compactSizeMask
    property_table_values,
    NULL  // table allocated at runtime
};  // {{binding_class}}::Prototype::property_table_prototype

// static
const JSC::HashTable* {{binding_class}}::Prototype::GetPropertyTable(
    JSC::ExecState* exec_state) {
  return ThreadLocalHashTable::GetInstance()->GetHashTable(
      {{binding_class}}::Prototype::s_classinfo(), property_table_prototype);
}

const JSC::ClassInfo {{binding_class}}::Prototype::s_info = {
    "{{interface_name}}Prototype",  // className
    BaseClass::s_classinfo(),  // parentClass
    NULL,  // static hash-table of properties (not used)
    GetPropertyTable,  // function pointer to get hash-table of properties
    CREATE_METHOD_TABLE({{binding_class}}::Prototype)
};  // {{binding_class}}::Prototype::s_info

// Look up property slot for querying property values.
bool {{binding_class}}::Prototype::getOwnPropertySlot(JSC::JSCell* cell,
    JSC::ExecState* exec, JSC::PropertyName property_name,
    JSC::PropertySlot& slot) {
  Prototype* this_object = JSC::jsCast<Prototype*>(cell);
  ASSERT_GC_OBJECT_INHERITS(this_object, &s_info);
  return JSC::getStaticPropertySlot<Prototype, JSC::JSObject>(
      exec, GetPropertyTable(exec), this_object, property_name, slot);
}

// static
JSC::JSObject* {{binding_class}}::Prototype::GetInstance(
    JSC::JSGlobalObject* base_global_object) {
  JSCGlobalObject* global_object =
      static_cast<JSCGlobalObject*>(base_global_object);
  ASSERT_GC_OBJECT_INHERITS(global_object, JSCGlobalObject::s_classinfo());

  // Try to get the cached prototype, and create a new one if needed.
  JSC::JSObject* prototype = global_object->object_cache()->GetCachedPrototype(&s_info);
  if (prototype == NULL) {
    JSC::JSGlobalData& global_data = global_object->globalData();
    JSC::JSLockHolder lock(&global_data);

{% if parent_interface %}
    JSC::JSObject* parent_prototype =
        {{parent_interface}}::GetPrototype(global_object);
{% elif is_exception_interface %}
    JSC::JSObject* parent_prototype = global_object->errorPrototype();
{% else %}
    JSC::JSObject* parent_prototype = global_object->objectPrototype();
{% endif %}
    JSC::TypeInfo type_info(JSC::ObjectType, StructureFlags);
    JSC::Structure* structure = JSC::Structure::create(
        global_data,
        global_object,
        JSC::JSValue(parent_prototype),
        type_info,
        &s_info);

    // Create the new prototype object.
    Prototype* new_prototype =
        new (NotNull, JSC::allocateCell<Prototype>(
            global_data.heap))
        Prototype(global_object, structure);
    new_prototype->finishCreation(global_data);
    // Add the prototype to the cache.
    global_object->object_cache()->CachePrototype(&s_info, new_prototype);
    prototype = new_prototype;
  }
  DCHECK_EQ(global_object->object_cache()->GetCachedPrototype(&s_info), prototype);
  return prototype;
}

// End of {{binding_class}}::Prototype class