diff options
Diffstat (limited to 'Source/JavaScriptCore/runtime/PropertySlot.h')
| -rw-r--r-- | Source/JavaScriptCore/runtime/PropertySlot.h | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/PropertySlot.h b/Source/JavaScriptCore/runtime/PropertySlot.h new file mode 100644 index 000000000..7aefcd37f --- /dev/null +++ b/Source/JavaScriptCore/runtime/PropertySlot.h @@ -0,0 +1,270 @@ +/* + * Copyright (C) 2005, 2007, 2008, 2015 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 "JSCJSValue.h" +#include "PropertyName.h" +#include "PropertyOffset.h" +#include "Register.h" +#include <wtf/Assertions.h> + +namespace JSC { + +class ExecState; +class GetterSetter; +class JSObject; + +// ECMA 262-3 8.6.1 +// Property attributes +enum Attribute { + None = 0, + ReadOnly = 1 << 1, // property can be only read, not written + DontEnum = 1 << 2, // property doesn't appear in (for .. in ..) + DontDelete = 1 << 3, // property can't be deleted + Function = 1 << 4, // property is a function - only used by static hashtables + Accessor = 1 << 5, // property is a getter/setter + CustomAccessor = 1 << 6, + Builtin = 1 << 7, // property is a builtin function - only used by static hashtables + ConstantInteger = 1 << 8, // property is a constant integer - only used by static hashtables + BuiltinOrFunction = Builtin | Function, // helper only used by static hashtables + BuiltinOrFunctionOrAccessor = Builtin | Function | Accessor, // helper only used by static hashtables + BuiltinOrFunctionOrAccessorOrConstant = Builtin | Function | Accessor | ConstantInteger, // helper only used by static hashtables +}; + +class PropertySlot { + enum PropertyType { + TypeUnset, + TypeValue, + TypeGetter, + TypeCustom + }; + + enum CacheabilityType { + CachingDisallowed, + CachingAllowed + }; + +public: + explicit PropertySlot(const JSValue thisValue) + : m_propertyType(TypeUnset) + , m_offset(invalidOffset) + , m_thisValue(thisValue) + , m_slotBase(nullptr) + , m_watchpointSet(nullptr) + , m_cacheability(CachingAllowed) + { + } + + typedef EncodedJSValue (*GetValueFunc)(ExecState*, JSObject* slotBase, EncodedJSValue thisValue, PropertyName); + + JSValue getValue(ExecState*, PropertyName) const; + JSValue getValue(ExecState*, unsigned propertyName) const; + + bool isCacheable() const { return m_cacheability == CachingAllowed && m_offset != invalidOffset; } + bool isUnset() const { return m_propertyType == TypeUnset; } + bool isValue() const { return m_propertyType == TypeValue; } + bool isAccessor() const { return m_propertyType == TypeGetter; } + bool isCustom() const { return m_propertyType == TypeCustom; } + bool isCacheableValue() const { return isCacheable() && isValue(); } + bool isCacheableGetter() const { return isCacheable() && isAccessor(); } + bool isCacheableCustom() const { return isCacheable() && isCustom(); } + + void disableCaching() + { + m_cacheability = CachingDisallowed; + } + + unsigned attributes() const { return m_attributes; } + + PropertyOffset cachedOffset() const + { + ASSERT(isCacheable()); + return m_offset; + } + + GetterSetter* getterSetter() const + { + ASSERT(isAccessor()); + return m_data.getter.getterSetter; + } + + GetValueFunc customGetter() const + { + ASSERT(isCacheableCustom()); + return m_data.custom.getValue; + } + + JSObject* slotBase() const + { + return m_slotBase; + } + + WatchpointSet* watchpointSet() const + { + return m_watchpointSet; + } + + void setValue(JSObject* slotBase, unsigned attributes, JSValue value) + { + m_data.value = JSValue::encode(value); + m_attributes = attributes; + + ASSERT(slotBase); + m_slotBase = slotBase; + m_propertyType = TypeValue; + m_offset = invalidOffset; + } + + void setValue(JSObject* slotBase, unsigned attributes, JSValue value, PropertyOffset offset) + { + ASSERT(value); + m_data.value = JSValue::encode(value); + m_attributes = attributes; + + ASSERT(slotBase); + m_slotBase = slotBase; + m_propertyType = TypeValue; + m_offset = offset; + } + + void setValue(JSString*, unsigned attributes, JSValue value) + { + ASSERT(value); + m_data.value = JSValue::encode(value); + m_attributes = attributes; + + m_slotBase = 0; + m_propertyType = TypeValue; + m_offset = invalidOffset; + } + + void setCustom(JSObject* slotBase, unsigned attributes, GetValueFunc getValue) + { + ASSERT(getValue); + m_data.custom.getValue = getValue; + m_attributes = attributes; + + ASSERT(slotBase); + m_slotBase = slotBase; + m_propertyType = TypeCustom; + m_offset = invalidOffset; + } + + void setCacheableCustom(JSObject* slotBase, unsigned attributes, GetValueFunc getValue) + { + ASSERT(getValue); + m_data.custom.getValue = getValue; + m_attributes = attributes; + + ASSERT(slotBase); + m_slotBase = slotBase; + m_propertyType = TypeCustom; + m_offset = !invalidOffset; + } + + void setGetterSlot(JSObject* slotBase, unsigned attributes, GetterSetter* getterSetter) + { + ASSERT(getterSetter); + m_data.getter.getterSetter = getterSetter; + m_attributes = attributes; + + ASSERT(slotBase); + m_slotBase = slotBase; + m_propertyType = TypeGetter; + m_offset = invalidOffset; + } + + void setCacheableGetterSlot(JSObject* slotBase, unsigned attributes, GetterSetter* getterSetter, PropertyOffset offset) + { + ASSERT(getterSetter); + m_data.getter.getterSetter = getterSetter; + m_attributes = attributes; + + ASSERT(slotBase); + m_slotBase = slotBase; + m_propertyType = TypeGetter; + m_offset = offset; + } + + void setThisValue(JSValue thisValue) + { + m_thisValue = thisValue; + } + + void setUndefined() + { + m_data.value = JSValue::encode(jsUndefined()); + m_attributes = ReadOnly | DontDelete | DontEnum; + + m_slotBase = 0; + m_propertyType = TypeValue; + m_offset = invalidOffset; + } + + void setWatchpointSet(WatchpointSet& set) + { + m_watchpointSet = &set; + } + +private: + JS_EXPORT_PRIVATE JSValue functionGetter(ExecState*) const; + + unsigned m_attributes; + union { + EncodedJSValue value; + struct { + GetterSetter* getterSetter; + } getter; + struct { + GetValueFunc getValue; + } custom; + } m_data; + + PropertyType m_propertyType; + PropertyOffset m_offset; + JSValue m_thisValue; + JSObject* m_slotBase; + WatchpointSet* m_watchpointSet; + CacheabilityType m_cacheability; +}; + +ALWAYS_INLINE JSValue PropertySlot::getValue(ExecState* exec, PropertyName propertyName) const +{ + if (m_propertyType == TypeValue) + return JSValue::decode(m_data.value); + if (m_propertyType == TypeGetter) + return functionGetter(exec); + return JSValue::decode(m_data.custom.getValue(exec, slotBase(), JSValue::encode(m_thisValue), propertyName)); +} + +ALWAYS_INLINE JSValue PropertySlot::getValue(ExecState* exec, unsigned propertyName) const +{ + if (m_propertyType == TypeValue) + return JSValue::decode(m_data.value); + if (m_propertyType == TypeGetter) + return functionGetter(exec); + return JSValue::decode(m_data.custom.getValue(exec, slotBase(), JSValue::encode(m_thisValue), Identifier::from(exec, propertyName))); +} + +} // namespace JSC + +#endif // PropertySlot_h |