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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2007 Eric Seidel (eric@webkit.org)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "JSObject.h"
#include "DatePrototype.h"
#include "ErrorConstructor.h"
#include "GetterSetter.h"
#include "JSGlobalObject.h"
#include "NativeErrorConstructor.h"
#include "ObjectPrototype.h"
#include "PropertyNameArray.h"
#include "lookup.h"
#include "nodes.h"
#include "operations.h"
#include <math.h>
#include <wtf/Assertions.h>
#define JSOBJECT_MARK_TRACING 0
#if JSOBJECT_MARK_TRACING
#define JSOBJECT_MARK_BEGIN() \
static int markStackDepth = 0; \
for (int i = 0; i < markStackDepth; i++) \
putchar('-'); \
printf("%s (%p)\n", className().UTF8String().c_str(), this); \
markStackDepth++; \
#define JSOBJECT_MARK_END() \
markStackDepth--;
#else // JSOBJECT_MARK_TRACING
#define JSOBJECT_MARK_BEGIN()
#define JSOBJECT_MARK_END()
#endif // JSOBJECT_MARK_TRACING
namespace JSC {
ASSERT_CLASS_FITS_IN_CELL(JSObject);
void JSObject::mark()
{
JSOBJECT_MARK_BEGIN();
JSCell::mark();
m_structureID->mark();
size_t storageSize = m_structureID->propertyStorageSize();
for (size_t i = 0; i < storageSize; ++i) {
JSValue* v = m_propertyStorage[i];
if (!v->marked())
v->mark();
}
JSOBJECT_MARK_END();
}
UString JSObject::className() const
{
const ClassInfo* info = classInfo();
if (info)
return info->className;
return "Object";
}
bool JSObject::getOwnPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot)
{
return getOwnPropertySlot(exec, Identifier::from(exec, propertyName), slot);
}
static void throwSetterError(ExecState* exec)
{
throwError(exec, TypeError, "setting a property that has only a getter");
}
// ECMA 8.6.2.2
void JSObject::put(ExecState* exec, const Identifier& propertyName, JSValue* value, PutPropertySlot& slot)
{
ASSERT(value);
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
if (propertyName == exec->propertyNames().underscoreProto) {
JSObject* proto = value->getObject();
// Setting __proto__ to a non-object, non-null value is silently ignored to match Mozilla.
if (!proto && !value->isNull())
return;
while (proto) {
if (proto == this) {
throwError(exec, GeneralError, "cyclic __proto__ value");
return;
}
proto = proto->prototype() ? proto->prototype()->getObject() : 0;
}
setPrototype(value);
return;
}
// Check if there are any setters or getters in the prototype chain
JSValue* prototype;
for (JSObject* obj = this; !obj->structureID()->hasGetterSetterProperties(); obj = asObject(prototype)) {
prototype = obj->prototype();
if (prototype->isNull()) {
putDirect(propertyName, value, 0, true, slot);
return;
}
}
unsigned attributes;
if ((m_structureID->get(propertyName, attributes) != WTF::notFound) && attributes & ReadOnly)
return;
for (JSObject* obj = this; ; obj = asObject(prototype)) {
if (JSValue* gs = obj->getDirect(propertyName)) {
if (gs->isGetterSetter()) {
JSObject* setterFunc = asGetterSetter(gs)->setter();
if (!setterFunc) {
throwSetterError(exec);
return;
}
CallData callData;
CallType callType = setterFunc->getCallData(callData);
ArgList args;
args.append(value);
call(exec, setterFunc, callType, callData, this, args);
return;
}
// If there's an existing property on the object or one of its
// prototypes it should be replaced, so break here.
break;
}
prototype = obj->prototype();
if (prototype->isNull())
break;
}
putDirect(propertyName, value, 0, true, slot);
return;
}
void JSObject::put(ExecState* exec, unsigned propertyName, JSValue* value)
{
PutPropertySlot slot;
put(exec, Identifier::from(exec, propertyName), value, slot);
}
void JSObject::putWithAttributes(ExecState*, const Identifier& propertyName, JSValue* value, unsigned attributes)
{
putDirect(propertyName, value, attributes);
}
void JSObject::putWithAttributes(ExecState* exec, unsigned propertyName, JSValue* value, unsigned attributes)
{
putWithAttributes(exec, Identifier::from(exec, propertyName), value, attributes);
}
bool JSObject::hasProperty(ExecState* exec, const Identifier& propertyName) const
{
PropertySlot slot;
return const_cast<JSObject*>(this)->getPropertySlot(exec, propertyName, slot);
}
bool JSObject::hasProperty(ExecState* exec, unsigned propertyName) const
{
PropertySlot slot;
return const_cast<JSObject*>(this)->getPropertySlot(exec, propertyName, slot);
}
// ECMA 8.6.2.5
bool JSObject::deleteProperty(ExecState* exec, const Identifier& propertyName)
{
unsigned attributes;
if (m_structureID->get(propertyName, attributes) != WTF::notFound) {
if ((attributes & DontDelete))
return false;
removeDirect(propertyName);
return true;
}
// Look in the static hashtable of properties
const HashEntry* entry = findPropertyHashEntry(exec, propertyName);
if (entry && entry->attributes() & DontDelete)
return false; // this builtin property can't be deleted
// FIXME: Should the code here actually do some deletion?
return true;
}
bool JSObject::hasOwnProperty(ExecState* exec, const Identifier& propertyName) const
{
PropertySlot slot;
return const_cast<JSObject*>(this)->getOwnPropertySlot(exec, propertyName, slot);
}
bool JSObject::deleteProperty(ExecState* exec, unsigned propertyName)
{
return deleteProperty(exec, Identifier::from(exec, propertyName));
}
static ALWAYS_INLINE JSValue* callDefaultValueFunction(ExecState* exec, const JSObject* object, const Identifier& propertyName)
{
JSValue* function = object->get(exec, propertyName);
CallData callData;
CallType callType = function->getCallData(callData);
if (callType == CallTypeNone)
return exec->exception();
// Prevent "toString" and "valueOf" from observing execution if an exception
// is pending.
if (exec->hadException())
return exec->exception();
JSValue* result = call(exec, function, callType, callData, const_cast<JSObject*>(object), exec->emptyList());
ASSERT(!result->isGetterSetter());
if (exec->hadException())
return exec->exception();
if (result->isObject())
return noValue();
return result;
}
bool JSObject::getPrimitiveNumber(ExecState* exec, double& number, JSValue*& result)
{
result = defaultValue(exec, PreferNumber);
number = result->toNumber(exec);
return !result->isString();
}
// ECMA 8.6.2.6
JSValue* JSObject::defaultValue(ExecState* exec, PreferredPrimitiveType hint) const
{
// Must call toString first for Date objects.
if ((hint == PreferString) || (hint != PreferNumber && prototype() == exec->lexicalGlobalObject()->datePrototype())) {
if (JSValue* value = callDefaultValueFunction(exec, this, exec->propertyNames().toString))
return value;
if (JSValue* value = callDefaultValueFunction(exec, this, exec->propertyNames().valueOf))
return value;
} else {
if (JSValue* value = callDefaultValueFunction(exec, this, exec->propertyNames().valueOf))
return value;
if (JSValue* value = callDefaultValueFunction(exec, this, exec->propertyNames().toString))
return value;
}
ASSERT(!exec->hadException());
return throwError(exec, TypeError, "No default value");
}
const HashEntry* JSObject::findPropertyHashEntry(ExecState* exec, const Identifier& propertyName) const
{
for (const ClassInfo* info = classInfo(); info; info = info->parentClass) {
if (const HashTable* propHashTable = info->propHashTable(exec)) {
if (const HashEntry* entry = propHashTable->entry(exec, propertyName))
return entry;
}
}
return 0;
}
void JSObject::defineGetter(ExecState* exec, const Identifier& propertyName, JSObject* getterFunction)
{
JSValue* object = getDirect(propertyName);
if (object && object->isGetterSetter()) {
ASSERT(m_structureID->hasGetterSetterProperties());
asGetterSetter(object)->setGetter(getterFunction);
return;
}
PutPropertySlot slot;
GetterSetter* getterSetter = new (exec) GetterSetter;
putDirect(propertyName, getterSetter, None, true, slot);
// putDirect will change our StructureID if we add a new property. For
// getters and setters, though, we also need to change our StructureID
// if we override an existing non-getter or non-setter.
if (slot.type() != PutPropertySlot::NewProperty) {
if (!m_structureID->isDictionary()) {
RefPtr<StructureID> structureID = StructureID::getterSetterTransition(m_structureID);
setStructureID(structureID.release());
}
}
m_structureID->setHasGetterSetterProperties(true);
getterSetter->setGetter(getterFunction);
}
void JSObject::defineSetter(ExecState* exec, const Identifier& propertyName, JSObject* setterFunction)
{
JSValue* object = getDirect(propertyName);
if (object && object->isGetterSetter()) {
ASSERT(m_structureID->hasGetterSetterProperties());
asGetterSetter(object)->setSetter(setterFunction);
return;
}
PutPropertySlot slot;
GetterSetter* getterSetter = new (exec) GetterSetter;
putDirect(propertyName, getterSetter, None, true, slot);
// putDirect will change our StructureID if we add a new property. For
// getters and setters, though, we also need to change our StructureID
// if we override an existing non-getter or non-setter.
if (slot.type() != PutPropertySlot::NewProperty) {
if (!m_structureID->isDictionary()) {
RefPtr<StructureID> structureID = StructureID::getterSetterTransition(m_structureID);
setStructureID(structureID.release());
}
}
m_structureID->setHasGetterSetterProperties(true);
getterSetter->setSetter(setterFunction);
}
JSValue* JSObject::lookupGetter(ExecState*, const Identifier& propertyName)
{
JSObject* object = this;
while (true) {
JSValue* value = object->getDirect(propertyName);
if (value) {
if (!value->isGetterSetter())
return jsUndefined();
JSObject* functionObject = asGetterSetter(value)->getter();
if (!functionObject)
return jsUndefined();
return functionObject;
}
if (!object->prototype() || !object->prototype()->isObject())
return jsUndefined();
object = asObject(object->prototype());
}
}
JSValue* JSObject::lookupSetter(ExecState*, const Identifier& propertyName)
{
JSObject* object = this;
while (true) {
JSValue* value = object->getDirect(propertyName);
if (value) {
if (!value->isGetterSetter())
return jsUndefined();
JSObject* functionObject = asGetterSetter(value)->setter();
if (!functionObject)
return jsUndefined();
return functionObject;
}
if (!object->prototype() || !object->prototype()->isObject())
return jsUndefined();
object = asObject(object->prototype());
}
}
bool JSObject::hasInstance(ExecState* exec, JSValue* value, JSValue* proto)
{
if (!proto->isObject()) {
throwError(exec, TypeError, "instanceof called on an object with an invalid prototype property.");
return false;
}
if (!value->isObject())
return false;
JSObject* object = asObject(value);
while ((object = object->prototype()->getObject())) {
if (object == proto)
return true;
}
return false;
}
bool JSObject::propertyIsEnumerable(ExecState* exec, const Identifier& propertyName) const
{
unsigned attributes;
if (!getPropertyAttributes(exec, propertyName, attributes))
return false;
return !(attributes & DontEnum);
}
bool JSObject::getPropertyAttributes(ExecState* exec, const Identifier& propertyName, unsigned& attributes) const
{
if (m_structureID->get(propertyName, attributes) != WTF::notFound)
return true;
// Look in the static hashtable of properties
const HashEntry* entry = findPropertyHashEntry(exec, propertyName);
if (entry) {
attributes = entry->attributes();
return true;
}
return false;
}
void JSObject::getPropertyNames(ExecState* exec, PropertyNameArray& propertyNames)
{
m_structureID->getEnumerablePropertyNames(exec, propertyNames, this);
}
bool JSObject::toBoolean(ExecState*) const
{
return true;
}
double JSObject::toNumber(ExecState* exec) const
{
JSValue* primitive = toPrimitive(exec, PreferNumber);
if (exec->hadException()) // should be picked up soon in nodes.cpp
return 0.0;
return primitive->toNumber(exec);
}
UString JSObject::toString(ExecState* exec) const
{
JSValue* primitive = toPrimitive(exec, PreferString);
if (exec->hadException())
return "";
return primitive->toString(exec);
}
JSObject* JSObject::toObject(ExecState*) const
{
return const_cast<JSObject*>(this);
}
JSObject* JSObject::toThisObject(ExecState*) const
{
return const_cast<JSObject*>(this);
}
JSGlobalObject* JSObject::toGlobalObject(ExecState*) const
{
return 0;
}
void JSObject::removeDirect(const Identifier& propertyName)
{
size_t offset;
if (m_structureID->isDictionary()) {
offset = m_structureID->removePropertyWithoutTransition(propertyName);
if (offset != WTF::notFound)
m_propertyStorage[offset] = jsUndefined();
return;
}
RefPtr<StructureID> structureID = StructureID::removePropertyTransition(m_structureID, propertyName, offset);
if (offset != WTF::notFound)
m_propertyStorage[offset] = jsUndefined();
setStructureID(structureID.release());
}
void JSObject::putDirectFunction(ExecState* exec, InternalFunction* function, unsigned attr)
{
putDirect(Identifier(exec, function->name(&exec->globalData())), function, attr);
}
void JSObject::putDirectFunctionWithoutTransition(ExecState* exec, InternalFunction* function, unsigned attr)
{
putDirectWithoutTransition(Identifier(exec, function->name(&exec->globalData())), function, attr);
}
NEVER_INLINE void JSObject::fillGetterPropertySlot(PropertySlot& slot, JSValue** location)
{
if (JSObject* getterFunction = asGetterSetter(*location)->getter())
slot.setGetterSlot(getterFunction);
else
slot.setUndefined();
}
StructureID* JSObject::createInheritorID()
{
m_inheritorID = JSObject::createStructureID(this);
return m_inheritorID.get();
}
void JSObject::allocatePropertyStorage(size_t oldSize, size_t newSize)
{
allocatePropertyStorageInline(oldSize, newSize);
}
JSObject* constructEmptyObject(ExecState* exec)
{
return new (exec) JSObject(exec->lexicalGlobalObject()->emptyObjectStructure());
}
} // namespace JSC
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