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/*
* Copyright (C) 2009-2019 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 "PropertyDescriptor.h"
#include "GetterSetter.h"
#include "JSObject.h"
#include "JSCInlines.h"
namespace JSC {
unsigned PropertyDescriptor::defaultAttributes = PropertyAttribute::DontDelete | PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly;
bool PropertyDescriptor::writable() const
{
ASSERT(!isAccessorDescriptor());
return !(m_attributes & PropertyAttribute::ReadOnly);
}
bool PropertyDescriptor::enumerable() const
{
return !(m_attributes & PropertyAttribute::DontEnum);
}
bool PropertyDescriptor::configurable() const
{
return !(m_attributes & PropertyAttribute::DontDelete);
}
bool PropertyDescriptor::isDataDescriptor() const
{
return m_value || (m_seenAttributes & WritablePresent);
}
bool PropertyDescriptor::isGenericDescriptor() const
{
return !isAccessorDescriptor() && !isDataDescriptor();
}
bool PropertyDescriptor::isAccessorDescriptor() const
{
return m_getter || m_setter;
}
void PropertyDescriptor::setUndefined()
{
m_value = jsUndefined();
m_attributes = PropertyAttribute::ReadOnly | PropertyAttribute::DontDelete | PropertyAttribute::DontEnum;
}
GetterSetter* PropertyDescriptor::slowGetterSetter(ExecState* exec)
{
VM& vm = exec->vm();
JSGlobalObject* globalObject = exec->lexicalGlobalObject();
JSValue getter = m_getter && !m_getter.isUndefined() ? jsCast<JSObject*>(m_getter) : jsUndefined();
JSValue setter = m_setter && !m_setter.isUndefined() ? jsCast<JSObject*>(m_setter) : jsUndefined();
return GetterSetter::create(vm, globalObject, getter, setter);
}
JSValue PropertyDescriptor::getter() const
{
ASSERT(isAccessorDescriptor());
return m_getter;
}
JSValue PropertyDescriptor::setter() const
{
ASSERT(isAccessorDescriptor());
return m_setter;
}
JSObject* PropertyDescriptor::getterObject() const
{
ASSERT(isAccessorDescriptor() && getterPresent());
return m_getter.isObject() ? asObject(m_getter) : 0;
}
JSObject* PropertyDescriptor::setterObject() const
{
ASSERT(isAccessorDescriptor() && setterPresent());
return m_setter.isObject() ? asObject(m_setter) : 0;
}
void PropertyDescriptor::setDescriptor(JSValue value, unsigned attributes)
{
ASSERT(value);
// We need to mask off the PropertyAttribute::CustomValue bit because
// PropertyDescriptor::attributesEqual() does an equivalent test on
// m_attributes, and a property that has a CustomValue should be indistinguishable
// from a property that has a normal value as far as JS code is concerned.
// PropertyAttribute does not need knowledge of the underlying implementation
// actually being a CustomValue. So, we'll just mask it off up front here.
m_attributes = attributes & ~PropertyAttribute::CustomValue;
if (value.isGetterSetter()) {
m_attributes &= ~PropertyAttribute::ReadOnly; // FIXME: we should be able to ASSERT this!
GetterSetter* accessor = jsCast<GetterSetter*>(value);
m_getter = !accessor->isGetterNull() ? accessor->getter() : jsUndefined();
m_setter = !accessor->isSetterNull() ? accessor->setter() : jsUndefined();
m_seenAttributes = EnumerablePresent | ConfigurablePresent;
} else {
m_value = value;
m_seenAttributes = EnumerablePresent | ConfigurablePresent | WritablePresent;
}
}
void PropertyDescriptor::setCustomDescriptor(unsigned attributes)
{
ASSERT(!(attributes & PropertyAttribute::CustomValue));
m_attributes = attributes | PropertyAttribute::Accessor | PropertyAttribute::CustomAccessor;
m_attributes &= ~PropertyAttribute::ReadOnly;
m_seenAttributes = EnumerablePresent | ConfigurablePresent;
setGetter(jsUndefined());
setSetter(jsUndefined());
m_value = JSValue();
}
void PropertyDescriptor::setAccessorDescriptor(GetterSetter* accessor, unsigned attributes)
{
ASSERT(attributes & PropertyAttribute::Accessor);
ASSERT(!(attributes & PropertyAttribute::CustomValue));
attributes &= ~PropertyAttribute::ReadOnly; // FIXME: we should be able to ASSERT this!
m_attributes = attributes;
m_getter = !accessor->isGetterNull() ? accessor->getter() : jsUndefined();
m_setter = !accessor->isSetterNull() ? accessor->setter() : jsUndefined();
m_seenAttributes = EnumerablePresent | ConfigurablePresent;
}
void PropertyDescriptor::setWritable(bool writable)
{
if (writable)
m_attributes &= ~PropertyAttribute::ReadOnly;
else
m_attributes |= PropertyAttribute::ReadOnly;
m_seenAttributes |= WritablePresent;
}
void PropertyDescriptor::setEnumerable(bool enumerable)
{
if (enumerable)
m_attributes &= ~PropertyAttribute::DontEnum;
else
m_attributes |= PropertyAttribute::DontEnum;
m_seenAttributes |= EnumerablePresent;
}
void PropertyDescriptor::setConfigurable(bool configurable)
{
if (configurable)
m_attributes &= ~PropertyAttribute::DontDelete;
else
m_attributes |= PropertyAttribute::DontDelete;
m_seenAttributes |= ConfigurablePresent;
}
void PropertyDescriptor::setSetter(JSValue setter)
{
m_setter = setter;
m_attributes |= PropertyAttribute::Accessor;
m_attributes &= ~PropertyAttribute::ReadOnly;
}
void PropertyDescriptor::setGetter(JSValue getter)
{
m_getter = getter;
m_attributes |= PropertyAttribute::Accessor;
m_attributes &= ~PropertyAttribute::ReadOnly;
}
bool PropertyDescriptor::equalTo(ExecState* exec, const PropertyDescriptor& other) const
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (other.m_value.isEmpty() != m_value.isEmpty()
|| other.m_getter.isEmpty() != m_getter.isEmpty()
|| other.m_setter.isEmpty() != m_setter.isEmpty())
return false;
if (m_value) {
bool isSame = sameValue(exec, other.m_value, m_value);
RETURN_IF_EXCEPTION(scope, false);
if (!isSame)
return false;
}
return (!m_getter || JSValue::strictEqual(exec, other.m_getter, m_getter))
&& (!m_setter || JSValue::strictEqual(exec, other.m_setter, m_setter))
&& attributesEqual(other);
}
bool PropertyDescriptor::attributesEqual(const PropertyDescriptor& other) const
{
unsigned mismatch = other.m_attributes ^ m_attributes;
unsigned sharedSeen = other.m_seenAttributes & m_seenAttributes;
if (sharedSeen & WritablePresent && mismatch & PropertyAttribute::ReadOnly)
return false;
if (sharedSeen & ConfigurablePresent && mismatch & PropertyAttribute::DontDelete)
return false;
if (sharedSeen & EnumerablePresent && mismatch & PropertyAttribute::DontEnum)
return false;
return true;
}
unsigned PropertyDescriptor::attributesOverridingCurrent(const PropertyDescriptor& current) const
{
unsigned currentAttributes = current.m_attributes;
if (isDataDescriptor() && current.isAccessorDescriptor())
currentAttributes |= PropertyAttribute::ReadOnly;
unsigned overrideMask = 0;
if (writablePresent())
overrideMask |= PropertyAttribute::ReadOnly;
if (enumerablePresent())
overrideMask |= PropertyAttribute::DontEnum;
if (configurablePresent())
overrideMask |= PropertyAttribute::DontDelete;
if (isAccessorDescriptor())
overrideMask |= PropertyAttribute::Accessor;
return (m_attributes & overrideMask) | (currentAttributes & ~overrideMask & ~PropertyAttribute::CustomAccessor);
}
}