[turbofan] Cleanup Graph and related classes.

src/compiler/node-marker.h

+// 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_