JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / runtime / JSPropertyNameIterator.cpp

diff --git a/runtime/JSPropertyNameIterator.cpp b/runtime/JSPropertyNameIterator.cpp
index 8c7b53d5319bb0d4e6d05d71f66d3240308d015a..b595980a7021485575ad90805482f05b4ef6990b 100644 (file)
--- a/runtime/JSPropertyNameIterator.cpp
+++ b/runtime/JSPropertyNameIterator.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -10,7 +10,7 @@
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
@@ -29,62 +29,86 @@
 #include "config.h"
 #include "JSPropertyNameIterator.h"
 
+#include "JSCInlines.h"
+#include "JSGlobalObject.h"
+#include <wtf/StdLibExtras.h>
+
 namespace JSC {
 
-ASSERT_CLASS_FITS_IN_CELL(JSPropertyNameIterator);
+const ClassInfo JSPropertyNameIterator::s_info = { "JSPropertyNameIterator", 0, 0, 0, CREATE_METHOD_TABLE(JSPropertyNameIterator) };
 
-JSPropertyNameIterator::~JSPropertyNameIterator()
+inline JSPropertyNameIterator::JSPropertyNameIterator(ExecState* exec, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlots)
+    : JSCell(exec->vm(), exec->vm().propertyNameIteratorStructure.get())
+    , m_numCacheableSlots(numCacheableSlots)
+    , m_jsStringsSize(propertyNameArrayData->propertyNameVector().size())
+    , m_jsStrings(m_jsStringsSize ? std::make_unique<WriteBarrier<Unknown>[]>(m_jsStringsSize) : nullptr)
 {
 }
 
-JSValue JSPropertyNameIterator::toPrimitive(ExecState*, PreferredPrimitiveType) const
+JSPropertyNameIterator* JSPropertyNameIterator::create(ExecState* exec, JSObject* o)
 {
-    ASSERT_NOT_REACHED();
-    return JSValue();
-}
+    ASSERT(!o->structure()->enumerationCache() ||
+            o->structure()->enumerationCache()->cachedStructure() != o->structure() ||
+            o->structure()->enumerationCache()->cachedPrototypeChain() != o->structure()->prototypeChain(exec));
 
-bool JSPropertyNameIterator::getPrimitiveNumber(ExecState*, double&, JSValue&)
-{
-    ASSERT_NOT_REACHED();
-    return false;
-}
+    VM& vm = exec->vm();
 
-bool JSPropertyNameIterator::toBoolean(ExecState*) const
-{
-    ASSERT_NOT_REACHED();
-    return false;
-}
+    PropertyNameArray propertyNames(exec);
+    o->methodTable()->getPropertyNames(o, exec, propertyNames, ExcludeDontEnumProperties);
+    size_t numCacheableSlots = 0;
+    if (!o->structure()->hasNonEnumerableProperties() && !o->structure()->hasGetterSetterProperties()
+        && !o->structure()->isUncacheableDictionary() && !o->structure()->typeInfo().overridesGetPropertyNames())
+        numCacheableSlots = propertyNames.numCacheableSlots();
+    
+    JSPropertyNameIterator* jsPropertyNameIterator = new (NotNull, allocateCell<JSPropertyNameIterator>(vm.heap)) JSPropertyNameIterator(exec, propertyNames.data(), numCacheableSlots);
+    jsPropertyNameIterator->finishCreation(vm, propertyNames.data(), o);
 
-double JSPropertyNameIterator::toNumber(ExecState*) const
-{
-    ASSERT_NOT_REACHED();
-    return 0;
-}
+    if (o->structure()->isDictionary())
+        return jsPropertyNameIterator;
 
-UString JSPropertyNameIterator::toString(ExecState*) const
-{
-    ASSERT_NOT_REACHED();
-    return "";
+    if (o->structure()->typeInfo().overridesGetPropertyNames())
+        return jsPropertyNameIterator;
+    
+    if (hasIndexedProperties(o->indexingType()))
+        return jsPropertyNameIterator;
+    
+    size_t count = normalizePrototypeChain(exec, o);
+    StructureChain* structureChain = o->structure()->prototypeChain(exec);
+    WriteBarrier<Structure>* structure = structureChain->head();
+    for (size_t i = 0; i < count; ++i) {
+        if (structure[i]->typeInfo().overridesGetPropertyNames())
+            return jsPropertyNameIterator;
+    }
+
+    jsPropertyNameIterator->setCachedPrototypeChain(vm, structureChain);
+    jsPropertyNameIterator->setCachedStructure(vm, o->structure());
+    o->structure()->setEnumerationCache(vm, jsPropertyNameIterator);
+    return jsPropertyNameIterator;
 }
 
-JSObject* JSPropertyNameIterator::toObject(ExecState*) const
+void JSPropertyNameIterator::destroy(JSCell* cell)
 {
-    ASSERT_NOT_REACHED();
-    return 0;
+    static_cast<JSPropertyNameIterator*>(cell)->JSPropertyNameIterator::~JSPropertyNameIterator();
 }
 
-void JSPropertyNameIterator::mark()
+JSValue JSPropertyNameIterator::get(ExecState* exec, JSObject* base, size_t i)
 {
-    JSCell::mark();
-    if (m_object && !m_object->marked())
-        m_object->mark();
+    JSValue identifier = m_jsStrings[i].get();
+    if (m_cachedStructure.get() == base->structure() && m_cachedPrototypeChain.get() == base->structure()->prototypeChain(exec))
+        return identifier;
+
+    if (!base->hasProperty(exec, Identifier(exec, asString(identifier)->value(exec))))
+        return JSValue();
+    return identifier;
 }
 
-void JSPropertyNameIterator::invalidate()
+void JSPropertyNameIterator::visitChildren(JSCell* cell, SlotVisitor& visitor)
 {
-    ASSERT(m_position == m_end);
-    m_object = 0;
-    m_data.clear();
+    JSPropertyNameIterator* thisObject = jsCast<JSPropertyNameIterator*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
+    visitor.appendValues(thisObject->m_jsStrings.get(), thisObject->m_jsStringsSize);
+    visitor.append(&thisObject->m_cachedPrototypeChain);
 }
 
 } // namespace JSC