X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/6fe7ccc865dc7d7541b93c5bcaf6368d2c98a174..refs/heads/master:/runtime/PropertySlot.h diff --git a/runtime/PropertySlot.h b/runtime/PropertySlot.h index cfedf78..9a68372 100644 --- a/runtime/PropertySlot.h +++ b/runtime/PropertySlot.h @@ -21,221 +21,251 @@ #ifndef PropertySlot_h #define PropertySlot_h -#include "Identifier.h" -#include "JSValue.h" +#include "JSCJSValue.h" +#include "PropertyName.h" +#include "PropertyOffset.h" #include "Register.h" #include -#include namespace JSC { - class ExecState; - class JSObject; - -#define JSC_VALUE_MARKER 0 -#define INDEX_GETTER_MARKER reinterpret_cast(2) -#define GETTER_FUNCTION_MARKER reinterpret_cast(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_MARKER) - return m_value; - 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_MARKER) - return m_value; - 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 setValue(JSValue slotBase, JSValue value) - { - ASSERT(value); - clearOffset(); - m_getValue = JSC_VALUE_MARKER; - m_slotBase = slotBase; - m_value = value; - } - - void setValue(JSValue slotBase, JSValue value, size_t offset) - { - ASSERT(value); - m_getValue = JSC_VALUE_MARKER; - m_slotBase = slotBase; - m_value = value; - m_offset = offset; - m_cachedPropertyType = Value; - } - - void setValue(JSValue value) - { - ASSERT(value); - clearBase(); - clearOffset(); - m_getValue = JSC_VALUE_MARKER; - m_value = value; - } - - 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; } - - GetValueFunc customGetter() const - { - ASSERT(m_cachedPropertyType == Custom); - return m_getValue; - } - private: - JS_EXPORT_PRIVATE JSValue functionGetter(ExecState*) const; - - GetValueFunc m_getValue; - GetIndexValueFunc m_getIndexValue; - - JSValue m_slotBase; - union { - JSObject* getterFunc; - unsigned index; - } m_data; - - JSValue m_value; - JSValue m_thisValue; - - size_t m_offset; - CachedPropertyType m_cachedPropertyType; +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_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 + { + ASSERT(m_propertyType != TypeUnset); + return m_slotBase; + } + + WatchpointSet* watchpointSet() const + { + return m_watchpointSet; + } + + void setValue(JSObject* slotBase, unsigned attributes, JSValue value) + { + ASSERT(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