[turbofan] Cleanup Graph and related classes.

src/compiler/node-marker.cc

+// 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.
+
+#include "src/compiler/node-marker.h"
+
+#include "src/compiler/graph.h"
+#include "src/compiler/node.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+NodeMarkerBase::NodeMarkerBase(Graph* graph, uint32_t num_states)
+    : mark_min_(graph->mark_max_), mark_max_(graph->mark_max_ += num_states) {
+  DCHECK(num_states > 0);         // user error!
+  DCHECK(mark_max_ > mark_min_);  // check for wraparound.
+}
+
+
+Mark NodeMarkerBase::Get(Node* node) {
+  Mark mark = node->mark();
+  if (mark < mark_min_) {
+    mark = mark_min_;
+    node->set_mark(mark_min_);
+  }
+  DCHECK_LT(mark, mark_max_);
+  return mark - mark_min_;
+}
+
+
+void NodeMarkerBase::Set(Node* node, Mark mark) {
+  DCHECK_LT(mark, mark_max_ - mark_min_);
+  DCHECK_LT(node->mark(), mark_max_);
+  node->set_mark(mark + mark_min_);
+}
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8