| /* |
| * Copyright (C) 2009 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 "Operations.h" |
| |
| namespace JSC { |
| unsigned PropertyDescriptor::defaultAttributes = (DontDelete << 1) - 1; |
| |
| bool PropertyDescriptor::writable() const |
| { |
| ASSERT(!isAccessorDescriptor()); |
| return !(m_attributes & ReadOnly); |
| } |
| |
| bool PropertyDescriptor::enumerable() const |
| { |
| return !(m_attributes & DontEnum); |
| } |
| |
| bool PropertyDescriptor::configurable() const |
| { |
| return !(m_attributes & 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 = ReadOnly | DontDelete | DontEnum; |
| } |
| |
| JSValue PropertyDescriptor::getter() const |
| { |
| ASSERT(isAccessorDescriptor()); |
| return m_getter; |
| } |
| |
| JSValue PropertyDescriptor::setter() const |
| { |
| ASSERT(isAccessorDescriptor()); |
| return m_setter; |
| } |
| |
| void PropertyDescriptor::setDescriptor(JSValue value, unsigned attributes) |
| { |
| ASSERT(value); |
| m_attributes = attributes; |
| if (attributes & (Getter | Setter)) { |
| GetterSetter* accessor = asGetterSetter(value); |
| m_getter = accessor->getter(); |
| m_setter = accessor->setter(); |
| ASSERT(m_getter || m_setter); |
| m_seenAttributes = EnumerablePresent | ConfigurablePresent; |
| m_attributes &= ~ReadOnly; |
| } else { |
| m_value = value; |
| m_seenAttributes = EnumerablePresent | ConfigurablePresent | WritablePresent; |
| } |
| } |
| |
| void PropertyDescriptor::setAccessorDescriptor(JSValue getter, JSValue setter, unsigned attributes) |
| { |
| ASSERT(attributes & (Getter | Setter)); |
| ASSERT(getter || setter); |
| m_attributes = attributes; |
| m_getter = getter; |
| m_setter = setter; |
| m_attributes &= ~ReadOnly; |
| m_seenAttributes = EnumerablePresent | ConfigurablePresent; |
| } |
| |
| void PropertyDescriptor::setWritable(bool writable) |
| { |
| if (writable) |
| m_attributes &= ~ReadOnly; |
| else |
| m_attributes |= ReadOnly; |
| m_seenAttributes |= WritablePresent; |
| } |
| |
| void PropertyDescriptor::setEnumerable(bool enumerable) |
| { |
| if (enumerable) |
| m_attributes &= ~DontEnum; |
| else |
| m_attributes |= DontEnum; |
| m_seenAttributes |= EnumerablePresent; |
| } |
| |
| void PropertyDescriptor::setConfigurable(bool configurable) |
| { |
| if (configurable) |
| m_attributes &= ~DontDelete; |
| else |
| m_attributes |= DontDelete; |
| m_seenAttributes |= ConfigurablePresent; |
| } |
| |
| void PropertyDescriptor::setSetter(JSValue setter) |
| { |
| m_setter = setter; |
| m_attributes |= Setter; |
| m_attributes &= ~ReadOnly; |
| } |
| |
| void PropertyDescriptor::setGetter(JSValue getter) |
| { |
| m_getter = getter; |
| m_attributes |= Getter; |
| m_attributes &= ~ReadOnly; |
| } |
| |
| bool PropertyDescriptor::equalTo(ExecState* exec, const PropertyDescriptor& other) const |
| { |
| if (!other.m_value == m_value || |
| !other.m_getter == m_getter || |
| !other.m_setter == m_setter) |
| return false; |
| return (!m_value || JSValue::strictEqual(exec, other.m_value, m_value)) && |
| (!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 & ReadOnly) |
| return false; |
| if (sharedSeen & ConfigurablePresent && mismatch & DontDelete) |
| return false; |
| if (sharedSeen & EnumerablePresent && mismatch & DontEnum) |
| return false; |
| return true; |
| } |
| |
| unsigned PropertyDescriptor::attributesWithOverride(const PropertyDescriptor& other) const |
| { |
| unsigned mismatch = other.m_attributes ^ m_attributes; |
| unsigned sharedSeen = other.m_seenAttributes & m_seenAttributes; |
| unsigned newAttributes = m_attributes & defaultAttributes; |
| if (sharedSeen & WritablePresent && mismatch & ReadOnly) |
| newAttributes ^= ReadOnly; |
| if (sharedSeen & ConfigurablePresent && mismatch & DontDelete) |
| newAttributes ^= DontDelete; |
| if (sharedSeen & EnumerablePresent && mismatch & DontEnum) |
| newAttributes ^= DontEnum; |
| return newAttributes; |
| } |
| |
| } |