android_external_webkit/JavaScriptCore/runtime/JSCell.cpp at froyo · madmack/android_external_webkit · GitHub

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* 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 "JSCell.h"

#include "JSFunction.h"

#include "JSString.h"

#include "JSObject.h"

#include <wtf/MathExtras.h>

namespace JSC {

#if defined NAN && defined INFINITY

extern const double NaN = NAN;

extern const double Inf = INFINITY;

#else // !(defined NAN && defined INFINITY)

// The trick is to define the NaN and Inf globals with a different type than the declaration.

// This trick works because the mangled name of the globals does not include the type, although

// I'm not sure that's guaranteed. There could be alignment issues with this, since arrays of

// characters don't necessarily need the same alignment doubles do, but for now it seems to work.

// It would be good to figure out a 100% clean way that still avoids code that runs at init time.

// Note, we have to use union to ensure alignment. Otherwise, NaN_Bytes can start anywhere,

// while NaN_double has to be 4-byte aligned for 32-bits.

// With -fstrict-aliasing enabled, unions are the only safe way to do type masquerading.

static const union {

struct {

unsigned char NaN_Bytes[8];

unsigned char Inf_Bytes[8];

} bytes;

struct {

double NaN_Double;

double Inf_Double;

} doubles;

} NaNInf = { {

#if CPU(BIG_ENDIAN)

{ 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 },

{ 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 }

#elif CPU(MIDDLE_ENDIAN)

{ 0, 0, 0xf8, 0x7f, 0, 0, 0, 0 },

{ 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 }

#else

{ 0, 0, 0, 0, 0, 0, 0xf8, 0x7f },

{ 0, 0, 0, 0, 0, 0, 0xf0, 0x7f }

#endif

} } ;

extern const double NaN = NaNInf.doubles.NaN_Double;

extern const double Inf = NaNInf.doubles.Inf_Double;

#endif // !(defined NAN && defined INFINITY)

bool JSCell::getUInt32(uint32_t&) const

{

return false;

}

bool JSCell::getString(ExecState* exec, UString&stringValue) const

{

if (!isString())

return false;

stringValue = static_cast<const JSString*>(this)->value(exec);

return true;

}

UString JSCell::getString(ExecState* exec) const

{

return isString() ? static_cast<const JSString*>(this)->value(exec) : UString();

}

JSObject* JSCell::getObject()

{

return isObject() ? asObject(this) : 0;

}

const JSObject* JSCell::getObject() const

{

return isObject() ? static_cast<const JSObject*>(this) : 0;

}

CallType JSCell::getCallData(CallData&)

{

return CallTypeNone;

}

ConstructType JSCell::getConstructData(ConstructData&)

{

return ConstructTypeNone;

}

bool JSCell::getOwnPropertySlot(ExecState* exec, const Identifier& identifier, PropertySlot& slot)

{

// This is not a general purpose implementation of getOwnPropertySlot.

// It should only be called by JSValue::get.

// It calls getPropertySlot, not getOwnPropertySlot.

JSObject* object = toObject(exec);

slot.setBase(object);

if (!object->getPropertySlot(exec, identifier, slot))

slot.setUndefined();

return true;

}

bool JSCell::getOwnPropertySlot(ExecState* exec, unsigned identifier, PropertySlot& slot)

{

// This is not a general purpose implementation of getOwnPropertySlot.

// It should only be called by JSValue::get.

// It calls getPropertySlot, not getOwnPropertySlot.

JSObject* object = toObject(exec);

slot.setBase(object);

if (!object->getPropertySlot(exec, identifier, slot))

slot.setUndefined();

return true;

}

void JSCell::put(ExecState* exec, const Identifier& identifier, JSValue value, PutPropertySlot& slot)

{

toObject(exec)->put(exec, identifier, value, slot);

}

void JSCell::put(ExecState* exec, unsigned identifier, JSValue value)

{

toObject(exec)->put(exec, identifier, value);

}

bool JSCell::deleteProperty(ExecState* exec, const Identifier& identifier)

{

return toObject(exec)->deleteProperty(exec, identifier);

}

bool JSCell::deleteProperty(ExecState* exec, unsigned identifier)

{

return toObject(exec)->deleteProperty(exec, identifier);

}

JSObject* JSCell::toThisObject(ExecState* exec) const

{

return toObject(exec);

}

UString JSCell::toThisString(ExecState* exec) const

{

return toThisObject(exec)->toString(exec);

}

JSString* JSCell::toThisJSString(ExecState* exec)

{

return jsString(exec, toThisString(exec));

}

const ClassInfo* JSCell::classInfo() const

{

return 0;

}

JSValue JSCell::getJSNumber()

{

return JSValue();

}

bool JSCell::isGetterSetter() const

{

return false;

}

JSValue JSCell::toPrimitive(ExecState*, PreferredPrimitiveType) const

{

ASSERT_NOT_REACHED();

return JSValue();

}

bool JSCell::getPrimitiveNumber(ExecState*, double&, JSValue&)

{

ASSERT_NOT_REACHED();

return false;

}

bool JSCell::toBoolean(ExecState*) const

{

ASSERT_NOT_REACHED();

return false;

}

double JSCell::toNumber(ExecState*) const

{

ASSERT_NOT_REACHED();

return 0;

}

UString JSCell::toString(ExecState*) const

{

ASSERT_NOT_REACHED();

return UString();

}

JSObject* JSCell::toObject(ExecState*) const

{

ASSERT_NOT_REACHED();

return 0;

}

} // namespace JSC

android_external_webkit/JavaScriptCore/runtime/JSCell.cpp at froyo · madmack/android_external_webkit · GitHub

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