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187 lines (158 loc) · 7.39 KB
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/*
* Copyright (C) 2006, 2007 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#include "config.h"
#include "JSClassRef.h"
#include "APICast.h"
#include "InitializeThreading.h"
#include "JSCInlines.h"
#include "JSCallbackObject.h"
using namespace JSC;
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
const JSClassDefinition kJSClassDefinitionEmpty = { 0, 0, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr };
OpaqueJSClass::OpaqueJSClass(const JSClassDefinition* definition, OpaqueJSClass* protoClass)
: parentClass(nullptr)
, prototypeClass(nullptr)
, initialize(definition->initialize)
, finalize(definition->finalize)
, hasProperty(definition->hasProperty)
, getProperty(definition->getProperty)
, setProperty(definition->setProperty)
, deleteProperty(definition->deleteProperty)
, getPropertyNames(definition->getPropertyNames)
, callAsFunction(definition->callAsFunction)
, callAsConstructor(definition->callAsConstructor)
, hasInstance(definition->hasInstance)
, convertToType(definition->convertToType)
, m_className(String::fromUTF8(definition->className))
{
JSC::initialize();
if (const JSStaticValue* staticValue = definition->staticValues) {
while (staticValue->name) {
String valueName = String::fromUTF8(staticValue->name);
if (!valueName.isNull())
m_staticValues.add(valueName.impl(), makeUnique<StaticValueEntry>(staticValue->getProperty, staticValue->setProperty, staticValue->attributes, valueName));
++staticValue;
}
}
if (const JSStaticFunction* staticFunction = definition->staticFunctions) {
while (staticFunction->name) {
String functionName = String::fromUTF8(staticFunction->name);
if (!functionName.isNull())
m_staticFunctions.add(functionName.impl(), makeUnique<StaticFunctionEntry>(staticFunction->callAsFunction, staticFunction->attributes));
++staticFunction;
}
}
if (protoClass)
prototypeClass = JSClassRetain(protoClass);
if (definition->parentClass)
parentClass = JSClassRetain(definition->parentClass);
}
OpaqueJSClass::~OpaqueJSClass()
{
// The empty string is shared across threads & is an identifier, in all other cases we should have done a deep copy in className(), below.
ASSERT(!m_className.length() || !m_className.impl()->isAtom());
#if ASSERT_ENABLED
for (auto& key : m_staticValues.keys())
ASSERT(!key->isAtom());
for (auto& key : m_staticFunctions.keys())
ASSERT(!key->isAtom());
#endif
if (prototypeClass)
JSClassRelease(prototypeClass);
if (parentClass)
JSClassRelease(parentClass);
}
Ref<OpaqueJSClass> OpaqueJSClass::createNoAutomaticPrototype(const JSClassDefinition* definition)
{
return adoptRef(*new OpaqueJSClass(definition, nullptr));
}
Ref<OpaqueJSClass> OpaqueJSClass::create(const JSClassDefinition* clientDefinition)
{
JSClassDefinition definition = *clientDefinition; // Avoid modifying client copy.
JSClassDefinition protoDefinition = kJSClassDefinitionEmpty;
protoDefinition.finalize = nullptr;
std::swap(definition.staticFunctions, protoDefinition.staticFunctions); // Move static functions to the prototype.
// We are supposed to use JSClassRetain/Release but since we know that we currently have
// the only reference to this class object we cheat and use a RefPtr instead.
RefPtr<OpaqueJSClass> protoClass = adoptRef(new OpaqueJSClass(&protoDefinition, nullptr));
return adoptRef(*new OpaqueJSClass(&definition, protoClass.get()));
}
OpaqueJSClassContextData::OpaqueJSClassContextData(JSC::VM&, OpaqueJSClass* jsClass)
: m_class(jsClass)
{
for (auto& it : jsClass->m_staticValues) {
ASSERT(!it.key->isAtom());
String valueName = it.key->isolatedCopy();
staticValues.add(valueName.impl(), makeUnique<StaticValueEntry>(it.value->getProperty, it.value->setProperty, it.value->attributes, valueName));
}
for (auto& it : jsClass->m_staticFunctions) {
ASSERT(!it.key->isAtom());
staticFunctions.add(it.key->isolatedCopy(), makeUnique<StaticFunctionEntry>(it.value->callAsFunction, it.value->attributes));
}
}
OpaqueJSClassContextData& OpaqueJSClass::contextData(JSGlobalObject* globalObject)
{
auto& contextData = globalObject->contextData(this);
if (!contextData)
contextData = makeUnique<OpaqueJSClassContextData>(globalObject->vm(), this);
return *contextData;
}
String OpaqueJSClass::className()
{
// Make a deep copy, so that the caller has no chance to put the original into AtomStringTable.
return m_className.isolatedCopy();
}
OpaqueJSClassStaticValuesTable* OpaqueJSClass::staticValues(JSC::JSGlobalObject* globalObject)
{
return &contextData(globalObject).staticValues;
}
OpaqueJSClassStaticFunctionsTable* OpaqueJSClass::staticFunctions(JSC::JSGlobalObject* globalObject)
{
return &contextData(globalObject).staticFunctions;
}
JSObject* OpaqueJSClass::prototype(JSGlobalObject* globalObject)
{
/* Class (C++) and prototype (JS) inheritance are parallel, so:
* (C++) | (JS)
* ParentClass | ParentClassPrototype
* ^ | ^
* | | |
* DerivedClass | DerivedClassPrototype
*/
if (!prototypeClass)
return nullptr;
OpaqueJSClassContextData& jsClassData = contextData(globalObject);
if (JSObject* prototype = jsClassData.cachedPrototype.get())
return prototype;
// Recursive, but should be good enough for our purposes
JSObject* prototype = JSCallbackObject<JSNonFinalObject>::create(globalObject, globalObject->callbackObjectStructure(), prototypeClass, &jsClassData); // set jsClassData as the object's private data, so it can clear our reference on destruction
if (parentClass) {
if (JSObject* parentPrototype = parentClass->prototype(globalObject))
prototype->setPrototypeDirect(globalObject->vm(), parentPrototype);
}
jsClassData.cachedPrototype = Weak<JSObject>(prototype);
return prototype;
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END