/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009 Apple Inc. All rights reserved.
*
* 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.
*
*/
#ifndef JSCell_h
#define JSCell_h
#include <wtf/Noncopyable.h>
#include "Structure.h"
#include "JSValue.h"
#include "JSImmediate.h"
#include "Collector.h"
namespace JSC {
class JSCell : public NoncopyableCustomAllocated {
friend class GetterSetter;
friend class Heap;
friend class JIT;
friend class JSNumberCell;
friend class JSObject;
friend class JSPropertyNameIterator;
friend class JSString;
friend class JSValue;
friend class JSAPIValueWrapper;
friend struct VPtrSet;
private:
explicit JSCell(Structure*);
virtual ~JSCell();
public:
// Querying the type.
#if USE(JSVALUE32)
bool isNumber() const;
#endif
bool isString() const;
bool isObject() const;
virtual bool isGetterSetter() const;
virtual bool isObject(const ClassInfo*) const;
virtual bool isAPIValueWrapper() const { return false; }
Structure* structure() const;
// Extracting the value.
bool getString(UString&) const;
UString getString() const; // null string if not a string
JSObject* getObject(); // NULL if not an object
const JSObject* getObject() const; // NULL if not an object
virtual CallType getCallData(CallData&);
virtual ConstructType getConstructData(ConstructData&);
// Extracting integer values.
// FIXME: remove these methods, can check isNumberCell in JSValue && then call asNumberCell::*.
virtual bool getUInt32(uint32_t&) const;
// Basic conversions.
virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const = 0;
virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue&) = 0;
virtual bool toBoolean(ExecState*) const = 0;
virtual double toNumber(ExecState*) const = 0;
virtual UString toString(ExecState*) const = 0;
virtual JSObject* toObject(ExecState*) const = 0;
// Garbage collection.
void* operator new(size_t, ExecState*);
void* operator new(size_t, JSGlobalData*);
void* operator new(size_t, void* placementNewDestination) { return placementNewDestination; }
void markCellDirect();
virtual void markChildren(MarkStack&);
bool marked() const;
// Object operations, with the toObject operation included.
virtual const ClassInfo* classInfo() const;
virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
virtual void put(ExecState*, unsigned propertyName, JSValue);
virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
virtual bool deleteProperty(ExecState*, unsigned propertyName);
virtual JSObject* toThisObject(ExecState*) const;
virtual UString toThisString(ExecState*) const;
virtual JSString* toThisJSString(ExecState*);
virtual JSValue getJSNumber();
void* vptr() { return *reinterpret_cast<void**>(this); }
private:
// Base implementation; for non-object classes implements getPropertySlot.
bool fastGetOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
Structure* m_structure;
};
JSCell* asCell(JSValue);
inline JSCell* asCell(JSValue value)
{
return value.asCell();
}
inline JSCell::JSCell(Structure* structure)
: m_structure(structure)
{
}
inline JSCell::~JSCell()
{
}
#if USE(JSVALUE32)
inline bool JSCell::isNumber() const
{
return Heap::isNumber(const_cast<JSCell*>(this));
}
#endif
inline bool JSCell::isObject() const
{
return m_structure->typeInfo().type() == ObjectType;
}
inline bool JSCell::isString() const
{
return m_structure->typeInfo().type() == StringType;
}
inline Structure* JSCell::structure() const
{
return m_structure;
}
inline bool JSCell::marked() const
{
return Heap::isCellMarked(this);
}
inline void JSCell::markCellDirect()
{
Heap::markCell(this);
}
inline void JSCell::markChildren(MarkStack&)
{
ASSERT(marked());
}
inline void* JSCell::operator new(size_t size, JSGlobalData* globalData)
{
#ifdef JAVASCRIPTCORE_BUILDING_ALL_IN_ONE_FILE
return globalData->heap.inlineAllocate(size);
#else
return globalData->heap.allocate(size);
#endif
}
// --- JSValue inlines ----------------------------
inline bool JSValue::isString() const
{
return isCell() && asCell()->isString();
}
inline bool JSValue::isGetterSetter() const
{
return isCell() && asCell()->isGetterSetter();
}
inline bool JSValue::isObject() const
{
return isCell() && asCell()->isObject();
}
inline bool JSValue::getString(UString& s) const
{
return isCell() && asCell()->getString(s);
}
inline UString JSValue::getString() const
{
return isCell() ? asCell()->getString() : UString();
}
inline JSObject* JSValue::getObject() const
{
return isCell() ? asCell()->getObject() : 0;
}
inline CallType JSValue::getCallData(CallData& callData)
{
return isCell() ? asCell()->getCallData(callData) : CallTypeNone;
}
inline ConstructType JSValue::getConstructData(ConstructData& constructData)
{
return isCell() ? asCell()->getConstructData(constructData) : ConstructTypeNone;
}
ALWAYS_INLINE bool JSValue::getUInt32(uint32_t& v) const
{
if (isInt32()) {
int32_t i = asInt32();
v = static_cast<uint32_t>(i);
return i >= 0;
}
if (isDouble()) {
double d = asDouble();
v = static_cast<uint32_t>(d);
return v == d;
}
return false;
}
inline void JSValue::markDirect()
{
ASSERT(!marked());
asCell()->markCellDirect();
}
inline void JSValue::markChildren(MarkStack& markStack)
{
ASSERT(marked());
asCell()->markChildren(markStack);
}
inline bool JSValue::marked() const
{
return !isCell() || asCell()->marked();
}
#if !USE(JSVALUE32_64)
ALWAYS_INLINE JSCell* JSValue::asCell() const
{
ASSERT(isCell());
return m_ptr;
}
#endif // !USE(JSVALUE32_64)
inline JSValue JSValue::toPrimitive(ExecState* exec, PreferredPrimitiveType preferredType) const
{
return isCell() ? asCell()->toPrimitive(exec, preferredType) : asValue();
}
inline bool JSValue::getPrimitiveNumber(ExecState* exec, double& number, JSValue& value)
{
if (isInt32()) {
number = asInt32();
value = *this;
return true;
}
if (isDouble()) {
number = asDouble();
value = *this;
return true;
}
if (isCell())
return asCell()->getPrimitiveNumber(exec, number, value);
if (isTrue()) {
number = 1.0;
value = *this;
return true;
}
if (isFalse() || isNull()) {
number = 0.0;
value = *this;
return true;
}
ASSERT(isUndefined());
number = nonInlineNaN();
value = *this;
return true;
}
inline bool JSValue::toBoolean(ExecState* exec) const
{
if (isInt32())
return asInt32() != 0;
if (isDouble())
return asDouble() > 0.0 || asDouble() < 0.0; // false for NaN
if (isCell())
return asCell()->toBoolean(exec);
return isTrue(); // false, null, and undefined all convert to false.
}
ALWAYS_INLINE double JSValue::toNumber(ExecState* exec) const
{
if (isInt32())
return asInt32();
if (isDouble())
return asDouble();
if (isCell())
return asCell()->toNumber(exec);
if (isTrue())
return 1.0;
return isUndefined() ? nonInlineNaN() : 0; // null and false both convert to 0.
}
inline UString JSValue::toString(ExecState* exec) const
{
if (isCell())
return asCell()->toString(exec);
if (isInt32())
return UString::from(asInt32());
if (isDouble())
return asDouble() == 0.0 ? "0" : UString::from(asDouble());
if (isTrue())
return "true";
if (isFalse())
return "false";
if (isNull())
return "null";
ASSERT(isUndefined());
return "undefined";
}
inline bool JSValue::needsThisConversion() const
{
if (UNLIKELY(!isCell()))
return true;
return asCell()->structure()->typeInfo().needsThisConversion();
}
inline UString JSValue::toThisString(ExecState* exec) const
{
return isCell() ? asCell()->toThisString(exec) : toString(exec);
}
inline JSValue JSValue::getJSNumber()
{
if (isInt32() || isDouble())
return *this;
if (isCell())
return asCell()->getJSNumber();
return JSValue();
}
inline bool JSValue::hasChildren() const
{
return asCell()->structure()->typeInfo().type() >= CompoundType;
}
inline JSObject* JSValue::toObject(ExecState* exec) const
{
return isCell() ? asCell()->toObject(exec) : toObjectSlowCase(exec);
}
inline JSObject* JSValue::toThisObject(ExecState* exec) const
{
return isCell() ? asCell()->toThisObject(exec) : toThisObjectSlowCase(exec);
}
ALWAYS_INLINE void MarkStack::append(JSCell* cell)
{
ASSERT(cell);
if (cell->marked())
return;
cell->markCellDirect();
if (cell->structure()->typeInfo().type() >= CompoundType)
m_values.append(cell);
}
inline void MarkStack::drain() {
while (!m_markSets.isEmpty() || !m_values.isEmpty()) {
while ((!m_markSets.isEmpty()) && m_values.size() < 50) {
const MarkSet& current = m_markSets.removeLast();
JSValue* ptr = current.m_values;
JSValue* end = current.m_end;
if (current.m_properties == NoNullValues) {
while (ptr != end)
append(*ptr++);
} else {
while (ptr != end) {
if (JSValue value = *ptr++)
append(value);
}
}
}
while (!m_values.isEmpty()) {
JSCell* current = m_values.removeLast();
ASSERT(current->marked());
current->markChildren(*this);
}
}
}
} // namespace JSC
#endif // JSCell_h