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67 lines
1.6 KiB
67 lines
1.6 KiB
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_COMPILER_NODE_MARKER_H_
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#define V8_COMPILER_NODE_MARKER_H_
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#include "src/compiler/node.h"
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namespace v8 {
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namespace internal {
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namespace compiler {
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// Forward declarations.
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class Graph;
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// Base class for templatized NodeMarkers.
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class NodeMarkerBase {
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public:
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NodeMarkerBase(Graph* graph, uint32_t num_states);
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V8_INLINE Mark Get(Node* node) {
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Mark mark = node->mark();
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if (mark < mark_min_) {
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mark = mark_min_;
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node->set_mark(mark_min_);
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}
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DCHECK_LT(mark, mark_max_);
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return mark - mark_min_;
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}
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V8_INLINE void Set(Node* node, Mark mark) {
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DCHECK_LT(mark, mark_max_ - mark_min_);
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DCHECK_LT(node->mark(), mark_max_);
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node->set_mark(mark + mark_min_);
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}
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private:
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Mark const mark_min_;
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Mark const mark_max_;
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DISALLOW_COPY_AND_ASSIGN(NodeMarkerBase);
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};
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// A NodeMarker uses monotonically increasing marks to assign local "states"
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// to nodes. Only one NodeMarker per graph is valid at a given time.
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template <typename State>
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class NodeMarker : public NodeMarkerBase {
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public:
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V8_INLINE NodeMarker(Graph* graph, uint32_t num_states)
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: NodeMarkerBase(graph, num_states) {}
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V8_INLINE State Get(Node* node) {
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return static_cast<State>(NodeMarkerBase::Get(node));
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}
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V8_INLINE void Set(Node* node, State state) {
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NodeMarkerBase::Set(node, static_cast<Mark>(state));
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}
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};
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} // namespace compiler
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} // namespace internal
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} // namespace v8
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#endif // V8_COMPILER_NODE_MARKER_H_
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