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

#ifndef RCC_LIB_TARGET_RISCV_GISEL_RISCVCALLLOWERING_H
#define RCC_LIB_TARGET_RISCV_GISEL_RISCVCALLLOWERING_H

#include "../RISCVCallingConv.h"
#include "rcc/CodeGen/TargetCallLowering.h"
#include "rcc/Target/RISCV/RISCVInstructions.h"

#include <cstdint>

namespace rcc::riscv {

enum class CallTargetFlag : std::uint32_t {
  DirectCall = 1U << 0U,
};

enum class CallStackObjectFlag : std::uint64_t {
  IncomingArgument = 1ULL << 0U,
  OutgoingArgument = 1ULL << 1U,
  ByValCopy = 1ULL << 2U,
  VarArgSaveArea = 1ULL << 3U,
  VarArgAlignmentPadding = 1ULL << 4U,
};

enum class CallValueTransform : std::uint8_t {
  Full,
  AnyExtend,
  SignExtend,
  ZeroExtend,
  Truncate,
  Bitcast,
};

class RISCVCallLowering final : public TargetCallLowering {
public:
  [[nodiscard]] Expected<CallLoweringPlan>
  planFormalArguments(const FormalArgumentRequest &Request) const override;
  [[nodiscard]] Expected<CallLoweringPlan>
  planCall(const CallLoweringRequest &Request) const override;
  [[nodiscard]] Expected<CallLoweringPlan>
  planReturn(const ReturnLoweringRequest &Request) const override;
  [[nodiscard]] Expected<void> emitPlan(MachineIRBuilder &Builder,
                                        const CallLoweringPlan &Plan) const override;
};

} // namespace rcc::riscv

#endif // RCC_LIB_TARGET_RISCV_GISEL_RISCVCALLLOWERING_H