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)
30      : assembler_(assembler), split_rep_(MachineRepresentation::kSimd128) {}
31
32  // Resolve a set of parallel moves, emitting assembler instructions.
33  void Resolve(ParallelMove* parallel_move);
34
35 private:
36  // Performs the given move, possibly performing other moves to unblock the
37  // destination operand.
38  void PerformMove(ParallelMove* moves, MoveOperands* move);
39
40  // Assembler used to emit moves and save registers.
41  Assembler* const assembler_;
42
43  // While resolving moves, the largest FP representation that can be moved.
44  // Any larger moves must be split into an equivalent series of moves of this
45  // representation.
46  MachineRepresentation split_rep_;
47};
48
49}  // namespace compiler
50}  // namespace internal
51}  // namespace v8
52
53#endif  // V8_COMPILER_GAP_RESOLVER_H_
54