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+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_COMPILER_NODE_MARKER_H_
+#define V8_COMPILER_NODE_MARKER_H_
+
+#include "src/base/macros.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+// Forward declarations.
+class Graph;
+class Node;
+
+
+// Marks are used during traversal of the graph to distinguish states of nodes.
+// Each node has a mark which is a monotonically increasing integer, and a
+// {NodeMarker} has a range of values that indicate states of a node.
+typedef uint32_t Mark;
+
+
+// Base class for templatized NodeMarkers.
+class NodeMarkerBase {
+ public:
+ NodeMarkerBase(Graph* graph, uint32_t num_states);
+
+ Mark Get(Node* node);
+ void Set(Node* node, Mark mark);
+
+ private:
+ Mark mark_min_;
+ Mark mark_max_;
+
+ DISALLOW_COPY_AND_ASSIGN(NodeMarkerBase);
+};
+
+
+// A NodeMarker uses monotonically increasing marks to assign local "states"
+// to nodes. Only one NodeMarker per graph is valid at a given time.
+template <typename State>
+class NodeMarker : public NodeMarkerBase {
+ public:
+ NodeMarker(Graph* graph, uint32_t num_states)
+ : NodeMarkerBase(graph, num_states) {}
+
+ State Get(Node* node) {
+ return static_cast<State>(NodeMarkerBase::Get(node));
+ }
+
+ void Set(Node* node, State state) {
+ NodeMarkerBase::Set(node, static_cast<Mark>(state));
+ }
+};
+
+} // namespace compiler
+} // namespace internal
+} // namespace v8
+
+#endif // V8_COMPILER_NODE_MARKER_H_