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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_GLOBALISEL_INSTRUCTIONSELECTOR_H
#define RCC_CODEGEN_GLOBALISEL_INSTRUCTIONSELECTOR_H
#include "rcc/CodeGen/GlobalISel/GIMatchTableExecutor.h"
#include "rcc/Support/Error.h"
namespace rcc {
class MachineFunction;
class MachineInstr;
class TargetDescription;
class InstructionSelector : public GIMatchTableExecutor {
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 {};
}
[[nodiscard]] Expected<void> propagateSelectionFlags(MachineInstr &Output,
MachineInstrFlags InputFlags,
bool InputMayRaiseFPException,
const TargetDescription &Target) const;
[[nodiscard]] Expected<void> propagateSelectionFlags(MachineInstr &Output,
const MachineInstr &Input,
const TargetDescription &Target) const;
protected:
[[nodiscard]] Expected<void>
finalizeGeneratedInstruction(MachineInstr &Output, MachineFunction &Function,
const TargetDescription &Target, MachineInstrFlags InputFlags,
bool InputMayRaiseFPException) const override;
};
} // namespace rcc
#endif // RCC_CODEGEN_GLOBALISEL_INSTRUCTIONSELECTOR_H
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