blob: 9dd09c8d03b80da4bc79c9e166a6ee983bff34ff [file] [log] [blame]
// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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 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_;
};
} } // namespace v8::internal
#endif // V8_ARM_LITHIUM_GAP_RESOLVER_ARM_H_