1// Copyright 2014 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_COMPILER_GAP_RESOLVER_H_
6#define V8_COMPILER_GAP_RESOLVER_H_
7
8#include "src/compiler/instruction.h"
9
10namespace v8 {
11namespace internal {
12namespace compiler {
13
14class GapResolver FINAL {
15 public:
16  // Interface used by the gap resolver to emit moves and swaps.
17  class Assembler {
18   public:
19    virtual ~Assembler() {}
20
21    // Assemble move.
22    virtual void AssembleMove(InstructionOperand* source,
23                              InstructionOperand* destination) = 0;
24    // Assemble swap.
25    virtual void AssembleSwap(InstructionOperand* source,
26                              InstructionOperand* destination) = 0;
27  };
28
29  explicit GapResolver(Assembler* assembler) : assembler_(assembler) {}
30
31  // Resolve a set of parallel moves, emitting assembler instructions.
32  void Resolve(ParallelMove* parallel_move) const;
33
34 private:
35  // Perform the given move, possibly requiring other moves to satisfy
36  // dependencies.
37  void PerformMove(ZoneList<MoveOperands>* moves, MoveOperands* move) const;
38
39  // Assembler used to emit moves and save registers.
40  Assembler* const assembler_;
41};
42}
43}
44}  // namespace v8::internal::compiler
45
46#endif  // V8_COMPILER_GAP_RESOLVER_H_
47