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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_LOOP_PEELING_H_
#define V8_COMPILER_LOOP_PEELING_H_
#include "src/base/compiler-specific.h"
#include "src/common/globals.h"
#include "src/compiler/loop-analysis.h"
namespace v8 {
namespace internal {
namespace compiler {
class NodeOriginTable;
class SourcePositionTable;
// Represents the output of peeling a loop, which is basically the mapping
// from the body of the loop to the corresponding nodes in the peeled
// iteration.
class V8_EXPORT_PRIVATE PeeledIteration : public NON_EXPORTED_BASE(ZoneObject) {
public:
// Maps {node} to its corresponding copy in the peeled iteration, if
// the node was part of the body of the loop. Returns {node} otherwise.
Node* map(Node* node);
protected:
PeeledIteration() = default;
};
class CommonOperatorBuilder;
// Implements loop peeling.
class V8_EXPORT_PRIVATE LoopPeeler {
public:
LoopPeeler(Graph* graph, CommonOperatorBuilder* common, LoopTree* loop_tree,
Zone* tmp_zone, SourcePositionTable* source_positions,
NodeOriginTable* node_origins)
: graph_(graph),
common_(common),
loop_tree_(loop_tree),
tmp_zone_(tmp_zone),
source_positions_(source_positions),
node_origins_(node_origins) {}
bool CanPeel(LoopTree::Loop* loop) {
return LoopFinder::HasMarkedExits(loop_tree_, loop);
}
PeeledIteration* Peel(LoopTree::Loop* loop);
void PeelInnerLoopsOfTree();
static void EliminateLoopExits(Graph* graph, Zone* tmp_zone);
static void EliminateLoopExit(Node* loop);
static const size_t kMaxPeeledNodes = 1000;
private:
Graph* const graph_;
CommonOperatorBuilder* const common_;
LoopTree* const loop_tree_;
Zone* const tmp_zone_;
SourcePositionTable* const source_positions_;
NodeOriginTable* const node_origins_;
void PeelInnerLoops(LoopTree::Loop* loop);
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_LOOP_PEELING_H_
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