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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_ALL_NODES_H_
#define V8_COMPILER_ALL_NODES_H_
#include "src/compiler/node.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
namespace compiler {
// A helper utility that traverses the graph and gathers all nodes reachable
// from end.
class AllNodes {
public:
// Constructor. Traverses the graph and builds the {reachable} set of nodes
// reachable from {end}. When {only_inputs} is true, find the nodes
// reachable through input edges; these are all live nodes.
AllNodes(Zone* local_zone, Node* end, const Graph* graph,
bool only_inputs = true);
// Constructor. Traverses the graph and builds the {reachable} set of nodes
// reachable from the End node.
AllNodes(Zone* local_zone, const Graph* graph, bool only_inputs = true);
bool IsLive(const Node* node) const {
CHECK(only_inputs_);
return IsReachable(node);
}
bool IsReachable(const Node* node) const {
if (!node) return false;
size_t id = node->id();
return id < is_reachable_.size() && is_reachable_[id];
}
NodeVector reachable; // Nodes reachable from end.
private:
void Mark(Zone* local_zone, Node* end, const Graph* graph);
BoolVector is_reachable_;
const bool only_inputs_;
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_ALL_NODES_H_