// SPDX-License-Identifier: GPL-3.0-or-later

#ifndef RCC_CODEGEN_GLOBALISEL_INSTRUCTIONSELECTOR_H
#define RCC_CODEGEN_GLOBALISEL_INSTRUCTIONSELECTOR_H

#include "rcc/Support/Error.h"

namespace rcc {

class MachineFunction;
class MachineInstr;
class TargetDescription;

class InstructionSelector {
public:
  virtual ~InstructionSelector() = default;

  [[nodiscard]] virtual Expected<void> select(MachineInstr &Instruction, MachineFunction &Function,
                                              const TargetDescription &Target) const = 0;

  // Selection matching is read-only and completes before select() mutates MachineIR.
  [[nodiscard]] virtual Expected<void> canSelect(const MachineInstr &, const MachineFunction &,
                                                 const TargetDescription &) const {
    return {};
  }

  [[nodiscard]] virtual Expected<void>
  constrainSelectedInstruction(MachineInstr &, MachineFunction &, const TargetDescription &) const {
    return {};
  }
};

} // namespace rcc

#endif // RCC_CODEGEN_GLOBALISEL_INSTRUCTIONSELECTOR_H