1 files changed, 189 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/SparseArrayValueMap.cpp b/Source/JavaScriptCore/runtime/SparseArrayValueMap.cpp
new file mode 100644
index 000000000..62d34baaf
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+++ b/Source/JavaScriptCore/runtime/SparseArrayValueMap.cpp
@@ -0,0 +1,189 @@
+/*
+ * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "SparseArrayValueMap.h"
+
+#include "ClassInfo.h"
+#include "GetterSetter.h"
+#include "JSObject.h"
+#include "JSCInlines.h"
+#include "PropertySlot.h"
+#include "Reject.h"
+#include "SlotVisitor.h"
+#include "Structure.h"
+
+namespace JSC {
+
+const ClassInfo SparseArrayValueMap::s_info = { "SparseArrayValueMap", 0, 0, CREATE_METHOD_TABLE(SparseArrayValueMap) };
+
+SparseArrayValueMap::SparseArrayValueMap(VM& vm)
+    : Base(vm, vm.sparseArrayValueMapStructure.get())
+    , m_flags(Normal)
+    , m_reportedCapacity(0)
+{
+}
+
+SparseArrayValueMap::~SparseArrayValueMap()
+{
+}
+
+void SparseArrayValueMap::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+}
+
+SparseArrayValueMap* SparseArrayValueMap::create(VM& vm)
+{
+    SparseArrayValueMap* result = new (NotNull, allocateCell<SparseArrayValueMap>(vm.heap)) SparseArrayValueMap(vm);
+    result->finishCreation(vm);
+    return result;
+}
+
+void SparseArrayValueMap::destroy(JSCell* cell)
+{
+    static_cast<SparseArrayValueMap*>(cell)->SparseArrayValueMap::~SparseArrayValueMap();
+}
+
+Structure* SparseArrayValueMap::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+{
+    return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
+}
+
+SparseArrayValueMap::AddResult SparseArrayValueMap::add(JSObject* array, unsigned i)
+{
+    SparseArrayEntry entry;
+    entry.setWithoutWriteBarrier(jsUndefined());
+
+    AddResult result = m_map.add(i, entry);
+    size_t capacity = m_map.capacity();
+    if (capacity != m_reportedCapacity) {
+        // FIXME: Adopt reportExtraMemoryVisited, and switch to reportExtraMemoryAllocated.
+        // https://bugs.webkit.org/show_bug.cgi?id=142595
+        Heap::heap(array)->deprecatedReportExtraMemory((capacity - m_reportedCapacity) * (sizeof(unsigned) + sizeof(WriteBarrier<Unknown>)));
+        m_reportedCapacity = capacity;
+    }
+    return result;
+}
+
+void SparseArrayValueMap::putEntry(ExecState* exec, JSObject* array, unsigned i, JSValue value, bool shouldThrow)
+{
+    AddResult result = add(array, i);
+    SparseArrayEntry& entry = result.iterator->value;
+
+    // To save a separate find & add, we first always add to the sparse map.
+    // In the uncommon case that this is a new property, and the array is not
+    // extensible, this is not the right thing to have done - so remove again.
+    if (result.isNewEntry && !array->isExtensible()) {
+        remove(result.iterator);
+        if (shouldThrow)
+            throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
+        return;
+    }
+    
+    entry.put(exec, array, this, value, shouldThrow);
+}
+
+bool SparseArrayValueMap::putDirect(ExecState* exec, JSObject* array, unsigned i, JSValue value, unsigned attributes, PutDirectIndexMode mode)
+{
+    AddResult result = add(array, i);
+    SparseArrayEntry& entry = result.iterator->value;
+
+    // To save a separate find & add, we first always add to the sparse map.
+    // In the uncommon case that this is a new property, and the array is not
+    // extensible, this is not the right thing to have done - so remove again.
+    if (mode != PutDirectIndexLikePutDirect && result.isNewEntry && !array->isExtensible()) {
+        remove(result.iterator);
+        return reject(exec, mode == PutDirectIndexShouldThrow, "Attempting to define property on object that is not extensible.");
+    }
+
+    entry.attributes = attributes;
+    entry.set(exec->vm(), this, value);
+    return true;
+}
+
+void SparseArrayEntry::get(JSObject* thisObject, PropertySlot& slot) const
+{
+    JSValue value = Base::get();
+    ASSERT(value);
+
+    if (LIKELY(!value.isGetterSetter())) {
+        slot.setValue(thisObject, attributes, value);
+        return;
+    }
+
+    slot.setGetterSlot(thisObject, attributes, jsCast<GetterSetter*>(value));
+}
+
+void SparseArrayEntry::get(PropertyDescriptor& descriptor) const
+{
+    descriptor.setDescriptor(Base::get(), attributes);
+}
+
+JSValue SparseArrayEntry::get(ExecState* exec, JSObject* array) const
+{
+    JSValue value = Base::get();
+    ASSERT(value);
+
+    if (LIKELY(!value.isGetterSetter()))
+        return value;
+
+    return callGetter(exec, array, jsCast<GetterSetter*>(value));
+}
+
+void SparseArrayEntry::put(ExecState* exec, JSValue thisValue, SparseArrayValueMap* map, JSValue value, bool shouldThrow)
+{
+    if (!(attributes & Accessor)) {
+        if (attributes & ReadOnly) {
+            if (shouldThrow)
+                throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
+            return;
+        }
+
+        set(exec->vm(), map, value);
+        return;
+    }
+
+    callSetter(exec, thisValue, Base::get(), value, shouldThrow ? StrictMode : NotStrictMode);
+}
+
+JSValue SparseArrayEntry::getNonSparseMode() const
+{
+    ASSERT(!attributes);
+    return Base::get();
+}
+
+void SparseArrayValueMap::visitChildren(JSCell* thisObject, SlotVisitor& visitor)
+{
+    Base::visitChildren(thisObject, visitor);
+    
+    SparseArrayValueMap* thisMap = jsCast<SparseArrayValueMap*>(thisObject);
+    iterator end = thisMap->m_map.end();
+    for (iterator it = thisMap->m_map.begin(); it != end; ++it)
+        visitor.append(&it->value);
+}
+
+} // namespace JSC
+