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Diffstat (limited to 'Source/JavaScriptCore/runtime/PropertySlot.h')
| -rw-r--r-- | Source/JavaScriptCore/runtime/PropertySlot.h | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/PropertySlot.h b/Source/JavaScriptCore/runtime/PropertySlot.h new file mode 100644 index 0000000..de9ddc9 --- /dev/null +++ b/Source/JavaScriptCore/runtime/PropertySlot.h @@ -0,0 +1,268 @@ +/* + * 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 "Identifier.h" +#include "JSValue.h" +#include "Register.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) +#define INDEX_GETTER_MARKER reinterpret_cast<GetValueFunc>(2) +#define GETTER_FUNCTION_MARKER reinterpret_cast<GetValueFunc>(3) + + class PropertySlot { + public: + enum CachedPropertyType { + Uncacheable, + Getter, + Custom, + Value + }; + + PropertySlot() + : m_cachedPropertyType(Uncacheable) + { + clearBase(); + clearOffset(); + clearValue(); + } + + explicit PropertySlot(const JSValue base) + : m_slotBase(base) + , m_cachedPropertyType(Uncacheable) + { + clearOffset(); + clearValue(); + } + + typedef JSValue (*GetValueFunc)(ExecState*, JSValue slotBase, const Identifier&); + typedef JSValue (*GetIndexValueFunc)(ExecState*, JSValue slotBase, unsigned); + + 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(); + if (m_getValue == INDEX_GETTER_MARKER) + return m_getIndexValue(exec, slotBase(), index()); + if (m_getValue == GETTER_FUNCTION_MARKER) + return functionGetter(exec); + return m_getValue(exec, slotBase(), propertyName); + } + + 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(); + if (m_getValue == INDEX_GETTER_MARKER) + return m_getIndexValue(exec, m_slotBase, m_data.index); + if (m_getValue == GETTER_FUNCTION_MARKER) + return functionGetter(exec); + return m_getValue(exec, slotBase(), Identifier::from(exec, propertyName)); + } + + CachedPropertyType cachedPropertyType() const { return m_cachedPropertyType; } + bool isCacheable() const { return m_cachedPropertyType != Uncacheable; } + bool isCacheableValue() const { return m_cachedPropertyType == Value; } + size_t cachedOffset() const + { + ASSERT(isCacheable()); + return m_offset; + } + + void setValueSlot(JSValue* valueSlot) + { + ASSERT(valueSlot); + clearBase(); + clearOffset(); + m_getValue = JSC_VALUE_SLOT_MARKER; + 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; + m_cachedPropertyType = Value; + } + + void setValue(JSValue value) + { + ASSERT(value); + clearBase(); + clearOffset(); + m_getValue = JSC_VALUE_SLOT_MARKER; + m_value = value; + m_data.valueSlot = &m_value; + } + + void setRegisterSlot(Register* registerSlot) + { + ASSERT(registerSlot); + clearBase(); + clearOffset(); + m_getValue = JSC_REGISTER_SLOT_MARKER; + m_data.registerSlot = registerSlot; + } + + void setCustom(JSValue slotBase, GetValueFunc getValue) + { + ASSERT(slotBase); + ASSERT(getValue); + m_getValue = getValue; + m_getIndexValue = 0; + m_slotBase = slotBase; + } + + void setCacheableCustom(JSValue slotBase, GetValueFunc getValue) + { + ASSERT(slotBase); + ASSERT(getValue); + m_getValue = getValue; + m_getIndexValue = 0; + m_slotBase = slotBase; + m_cachedPropertyType = Custom; + } + + void setCustomIndex(JSValue slotBase, unsigned index, GetIndexValueFunc getIndexValue) + { + ASSERT(slotBase); + ASSERT(getIndexValue); + m_getValue = INDEX_GETTER_MARKER; + m_getIndexValue = getIndexValue; + m_slotBase = slotBase; + m_data.index = index; + } + + void setGetterSlot(JSObject* getterFunc) + { + ASSERT(getterFunc); + m_thisValue = m_slotBase; + m_getValue = GETTER_FUNCTION_MARKER; + m_data.getterFunc = getterFunc; + } + + void setCacheableGetterSlot(JSValue slotBase, JSObject* getterFunc, unsigned offset) + { + ASSERT(getterFunc); + m_getValue = GETTER_FUNCTION_MARKER; + m_thisValue = m_slotBase; + m_slotBase = slotBase; + m_data.getterFunc = getterFunc; + m_offset = offset; + m_cachedPropertyType = Getter; + } + + void setUndefined() + { + setValue(jsUndefined()); + } + + JSValue slotBase() const + { + return m_slotBase; + } + + void setBase(JSValue base) + { + ASSERT(m_slotBase); + ASSERT(base); + m_slotBase = base; + } + + void clearBase() + { +#ifndef NDEBUG + m_slotBase = JSValue(); +#endif + } + + void clearValue() + { +#ifndef NDEBUG + m_value = JSValue(); +#endif + } + + void clearOffset() + { + // Clear offset even in release builds, in case this PropertySlot has been used before. + // (For other data members, we don't need to clear anything because reuse would meaningfully overwrite them.) + m_offset = 0; + m_cachedPropertyType = Uncacheable; + } + + unsigned index() const { return m_data.index; } + + JSValue thisValue() const { return m_thisValue; } + + GetValueFunc customGetter() const + { + ASSERT(m_cachedPropertyType == Custom); + return m_getValue; + } + private: + JSValue functionGetter(ExecState*) const; + + GetValueFunc m_getValue; + GetIndexValueFunc m_getIndexValue; + + JSValue m_slotBase; + union { + JSObject* getterFunc; + JSValue* valueSlot; + Register* registerSlot; + unsigned index; + } m_data; + + JSValue m_value; + JSValue m_thisValue; + + size_t m_offset; + CachedPropertyType m_cachedPropertyType; + }; + +} // namespace JSC + +#endif // PropertySlot_h |