1 files changed, 145 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/bytecode/GetByIdVariant.cpp b/Source/JavaScriptCore/bytecode/GetByIdVariant.cpp
new file mode 100644
index 000000000..a869d4a1c
--- /dev/null
+++ b/Source/JavaScriptCore/bytecode/GetByIdVariant.cpp
@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2014, 2015 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 "GetByIdVariant.h"
+
+#include "CallLinkStatus.h"
+#include "JSCInlines.h"
+#include <wtf/ListDump.h>
+
+namespace JSC {
+
+GetByIdVariant::GetByIdVariant(
+    const StructureSet& structureSet, PropertyOffset offset,
+    const ObjectPropertyConditionSet& conditionSet,
+    std::unique_ptr<CallLinkStatus> callLinkStatus,
+    JSFunction* intrinsicFunction)
+    : m_structureSet(structureSet)
+    , m_conditionSet(conditionSet)
+    , m_offset(offset)
+    , m_callLinkStatus(WTFMove(callLinkStatus))
+    , m_intrinsicFunction(intrinsicFunction)
+{
+    if (!structureSet.size()) {
+        ASSERT(offset == invalidOffset);
+        ASSERT(conditionSet.isEmpty());
+    }
+    if (intrinsicFunction)
+        ASSERT(intrinsic() != NoIntrinsic);
+}
+                     
+GetByIdVariant::~GetByIdVariant() { }
+
+GetByIdVariant::GetByIdVariant(const GetByIdVariant& other)
+    : GetByIdVariant()
+{
+    *this = other;
+}
+
+GetByIdVariant& GetByIdVariant::operator=(const GetByIdVariant& other)
+{
+    m_structureSet = other.m_structureSet;
+    m_conditionSet = other.m_conditionSet;
+    m_offset = other.m_offset;
+    m_intrinsicFunction = other.m_intrinsicFunction;
+    if (other.m_callLinkStatus)
+        m_callLinkStatus = std::make_unique<CallLinkStatus>(*other.m_callLinkStatus);
+    else
+        m_callLinkStatus = nullptr;
+    return *this;
+}
+
+inline bool GetByIdVariant::canMergeIntrinsicStructures(const GetByIdVariant& other) const
+{
+    if (m_intrinsicFunction != other.m_intrinsicFunction)
+        return false;
+    switch (intrinsic()) {
+    case TypedArrayByteLengthIntrinsic: {
+        // We can merge these sets as long as the element size of the two sets is the same.
+        TypedArrayType thisType = (*m_structureSet.begin())->classInfo()->typedArrayStorageType;
+        TypedArrayType otherType = (*other.m_structureSet.begin())->classInfo()->typedArrayStorageType;
+
+        ASSERT(isTypedView(thisType) && isTypedView(otherType));
+
+        return logElementSize(thisType) == logElementSize(otherType);
+    }
+
+    default:
+        return true;
+    }
+    RELEASE_ASSERT_NOT_REACHED();
+}
+
+bool GetByIdVariant::attemptToMerge(const GetByIdVariant& other)
+{
+    if (m_offset != other.m_offset)
+        return false;
+    if (m_callLinkStatus || other.m_callLinkStatus)
+        return false;
+
+    if (!canMergeIntrinsicStructures(other))
+        return false;
+
+    if (m_conditionSet.isEmpty() != other.m_conditionSet.isEmpty())
+        return false;
+    
+    ObjectPropertyConditionSet mergedConditionSet;
+    if (!m_conditionSet.isEmpty()) {
+        mergedConditionSet = m_conditionSet.mergedWith(other.m_conditionSet);
+        if (!mergedConditionSet.isValid() || !mergedConditionSet.hasOneSlotBaseCondition())
+            return false;
+    }
+    m_conditionSet = mergedConditionSet;
+    
+    m_structureSet.merge(other.m_structureSet);
+    
+    return true;
+}
+
+void GetByIdVariant::dump(PrintStream& out) const
+{
+    dumpInContext(out, 0);
+}
+
+void GetByIdVariant::dumpInContext(PrintStream& out, DumpContext* context) const
+{
+    if (!isSet()) {
+        out.print("<empty>");
+        return;
+    }
+    
+    out.print(
+        "<", inContext(structureSet(), context), ", ", inContext(m_conditionSet, context));
+    out.print(", offset = ", offset());
+    if (m_callLinkStatus)
+        out.print(", call = ", *m_callLinkStatus);
+    if (m_intrinsicFunction)
+        out.print(", intrinsic = ", *m_intrinsicFunction);
+    out.print(">");
+}
+
+} // namespace JSC
+