gap-resolver.h 1.65 KB
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// Copyright 2014 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.

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#ifndef V8_COMPILER_BACKEND_GAP_RESOLVER_H_
#define V8_COMPILER_BACKEND_GAP_RESOLVER_H_
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#include "src/compiler/backend/instruction.h"
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namespace v8 {
namespace internal {
namespace compiler {

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class GapResolver final {
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 public:
  // Interface used by the gap resolver to emit moves and swaps.
  class Assembler {
   public:
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    virtual ~Assembler() = default;
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    // Assemble move.
    virtual void AssembleMove(InstructionOperand* source,
                              InstructionOperand* destination) = 0;
    // Assemble swap.
    virtual void AssembleSwap(InstructionOperand* source,
                              InstructionOperand* destination) = 0;
  };

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  explicit GapResolver(Assembler* assembler)
      : assembler_(assembler), split_rep_(MachineRepresentation::kSimd128) {}
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  // Resolve a set of parallel moves, emitting assembler instructions.
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  V8_EXPORT_PRIVATE void Resolve(ParallelMove* parallel_move);
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 private:
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  // Performs the given move, possibly performing other moves to unblock the
  // destination operand.
  void PerformMove(ParallelMove* moves, MoveOperands* move);
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  // Assembler used to emit moves and save registers.
  Assembler* const assembler_;
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  // While resolving moves, the largest FP representation that can be moved.
  // Any larger moves must be split into an equivalent series of moves of this
  // representation.
  MachineRepresentation split_rep_;
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};
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}  // namespace compiler
}  // namespace internal
}  // namespace v8
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#endif  // V8_COMPILER_BACKEND_GAP_RESOLVER_H_