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Diffstat (limited to 'JavaScriptCore/runtime/PropertySlot.h')
| -rw-r--r-- | JavaScriptCore/runtime/PropertySlot.h | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/JavaScriptCore/runtime/PropertySlot.h b/JavaScriptCore/runtime/PropertySlot.h new file mode 100644 index 0000000..29c19d4 --- /dev/null +++ b/JavaScriptCore/runtime/PropertySlot.h @@ -0,0 +1,212 @@ +/* + * Copyright (C) 2005, 2007, 2008 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 PropertySlot_h +#define PropertySlot_h + +#include "Register.h" +#include "JSValue.h" +#include "identifier.h" +#include <wtf/Assertions.h> +#include <wtf/NotFound.h> + +namespace JSC { + + class ExecState; + class JSObject; + +#define JSC_VALUE_SLOT_MARKER 0 +#define JSC_REGISTER_SLOT_MARKER reinterpret_cast<GetValueFunc>(1) + + class PropertySlot { + public: + PropertySlot() + : m_offset(WTF::notFound) + { + clearBase(); + clearValue(); + } + + explicit PropertySlot(const JSValue* base) + : m_slotBase(const_cast<JSValue*>(base)) + , m_offset(WTF::notFound) + { + clearValue(); + } + + typedef JSValue* (*GetValueFunc)(ExecState*, const Identifier&, const PropertySlot&); + + JSValue* getValue(ExecState* exec, const Identifier& propertyName) const + { + if (m_getValue == JSC_VALUE_SLOT_MARKER) + return *m_data.valueSlot; + if (m_getValue == JSC_REGISTER_SLOT_MARKER) + return (*m_data.registerSlot).jsValue(exec); + return m_getValue(exec, propertyName, *this); + } + + JSValue* getValue(ExecState* exec, unsigned propertyName) const + { + if (m_getValue == JSC_VALUE_SLOT_MARKER) + return *m_data.valueSlot; + if (m_getValue == JSC_REGISTER_SLOT_MARKER) + return (*m_data.registerSlot).jsValue(exec); + return m_getValue(exec, Identifier::from(exec, propertyName), *this); + } + + bool isCacheable() const { return m_offset != WTF::notFound; } + size_t cachedOffset() const + { + ASSERT(isCacheable()); + return m_offset; + } + + void putValue(JSValue* value) + { + if (m_getValue == JSC_VALUE_SLOT_MARKER) { + *m_data.valueSlot = value; + return; + } + ASSERT(m_getValue == JSC_REGISTER_SLOT_MARKER); + *m_data.registerSlot = value; + } + + void setValueSlot(JSValue** valueSlot) + { + ASSERT(valueSlot); + m_getValue = JSC_VALUE_SLOT_MARKER; + clearBase(); + m_data.valueSlot = valueSlot; + } + + void setValueSlot(JSValue* slotBase, JSValue** valueSlot) + { + ASSERT(valueSlot); + m_getValue = JSC_VALUE_SLOT_MARKER; + m_slotBase = slotBase; + m_data.valueSlot = valueSlot; + } + + void setValueSlot(JSValue* slotBase, JSValue** valueSlot, size_t offset) + { + ASSERT(valueSlot); + m_getValue = JSC_VALUE_SLOT_MARKER; + m_slotBase = slotBase; + m_data.valueSlot = valueSlot; + m_offset = offset; + } + + void setValue(JSValue* value) + { + ASSERT(value); + m_getValue = JSC_VALUE_SLOT_MARKER; + clearBase(); + m_value = value; + m_data.valueSlot = &m_value; + } + + void setRegisterSlot(Register* registerSlot) + { + ASSERT(registerSlot); + m_getValue = JSC_REGISTER_SLOT_MARKER; + clearBase(); + m_data.registerSlot = registerSlot; + } + + void setCustom(JSValue* slotBase, GetValueFunc getValue) + { + ASSERT(slotBase); + ASSERT(getValue); + m_getValue = getValue; + m_slotBase = slotBase; + } + + void setCustomIndex(JSValue* slotBase, unsigned index, GetValueFunc getValue) + { + ASSERT(slotBase); + ASSERT(getValue); + m_getValue = getValue; + m_slotBase = slotBase; + m_data.index = index; + } + + void setGetterSlot(JSObject* getterFunc) + { + ASSERT(getterFunc); + m_getValue = functionGetter; + m_data.getterFunc = getterFunc; + } + + void setUndefined() + { + clearBase(); + setValue(jsUndefined()); + } + + JSValue* slotBase() const + { + ASSERT(m_slotBase); + return m_slotBase; + } + + void setBase(JSValue* base) + { + ASSERT(m_slotBase); + ASSERT(base); + m_slotBase = base; + } + + void clearBase() + { +#ifndef NDEBUG + m_slotBase = noValue(); +#endif + } + + void clearValue() + { +#ifndef NDEBUG + m_value = noValue(); +#endif + } + + unsigned index() const { return m_data.index; } + + private: + static JSValue* functionGetter(ExecState*, const Identifier&, const PropertySlot&); + + GetValueFunc m_getValue; + + JSValue* m_slotBase; + union { + JSObject* getterFunc; + JSValue** valueSlot; + Register* registerSlot; + unsigned index; + } m_data; + + JSValue* m_value; + + size_t m_offset; + }; + +} // namespace JSC + +#endif // PropertySlot_h |