1 files changed, 73 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGFlowIndexing.cpp b/Source/JavaScriptCore/dfg/DFGFlowIndexing.cpp
new file mode 100644
index 000000000..73c1869e8
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGFlowIndexing.cpp
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2016 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 "DFGFlowIndexing.h"
+
+#if ENABLE(DFG_JIT)
+
+namespace JSC { namespace DFG {
+
+FlowIndexing::FlowIndexing(Graph& graph)
+    : m_graph(graph)
+    , m_numIndices(0)
+{
+    recompute();
+}
+
+FlowIndexing::~FlowIndexing()
+{
+}
+
+void FlowIndexing::recompute()
+{
+    unsigned numNodeIndices = m_graph.maxNodeCount();
+    
+    m_nodeIndexToShadowIndex.resize(numNodeIndices);
+    m_nodeIndexToShadowIndex.fill(UINT_MAX);
+    
+    m_shadowIndexToNodeIndex.resize(0);
+
+    m_numIndices = numNodeIndices;
+
+    for (BasicBlock* block : m_graph.blocksInNaturalOrder()) {
+        for (Node* node : *block) {
+            if (node->op() != Phi)
+                continue;
+            
+            unsigned nodeIndex = node->index();
+            unsigned shadowIndex = m_numIndices++;
+            m_nodeIndexToShadowIndex[nodeIndex] = shadowIndex;
+            m_shadowIndexToNodeIndex.append(nodeIndex);
+            DFG_ASSERT(m_graph, nullptr, m_shadowIndexToNodeIndex.size() + numNodeIndices == m_numIndices);
+            DFG_ASSERT(m_graph, nullptr, m_shadowIndexToNodeIndex[shadowIndex - numNodeIndices] == nodeIndex);
+        }
+    }
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+