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// Copyright 2011 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_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
#define V8_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
#include "v8.h"
#include "lithium.h"
namespace v8 {
namespace internal {
class LCodeGen;
class LGapResolver;
class LGapResolver V8_FINAL BASE_EMBEDDED {
public:
explicit LGapResolver(LCodeGen* owner);
// Resolve a set of parallel moves, emitting assembler instructions.
void Resolve(LParallelMove* parallel_move);
private:
// Build the initial list of moves.
void BuildInitialMoveList(LParallelMove* parallel_move);
// Perform the move at the moves_ index in question (possibly requiring
// other moves to satisfy dependencies).
void PerformMove(int index);
// If a cycle is found in the series of moves, save the blocking value to
// a scratch register. The cycle must be found by hitting the root of the
// depth-first search.
void BreakCycle(int index);
// After a cycle has been resolved, restore the value from the scratch
// register to its proper destination.
void RestoreValue();
// Emit a move and remove it from the move graph.
void EmitMove(int index);
// Verify the move list before performing moves.
void Verify();
LCodeGen* cgen_;
// List of moves not yet resolved.
ZoneList<LMoveOperands> moves_;
int root_index_;
bool in_cycle_;
LOperand* saved_destination_;
// We use the root register as a scratch in a few places. When that happens,
// this flag is set to indicate that it needs to be restored.
bool need_to_restore_root_;
};
} } // namespace v8::internal
#endif // V8_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
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