--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/runtime/PropertySlot.h Fri Sep 17 09:02:29 2010 +0300
@@ -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