// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;

namespace Microsoft.Diagnostics.DataContractReader.Contracts.GCInfoHelpers;

internal class RISCV64GCInfoTraits : IGCInfoTraits
{
    public static uint DenormalizeStackBaseRegister(uint reg) => reg == 0 ? 8u : 2u;
    public static uint DenormalizeCodeLength(uint len) => len << 1;
    public static uint NormalizeCodeLength(uint len) => len >> 1;
    public static uint DenormalizeCodeOffset(uint offset) => offset << 1;
    public static uint NormalizeCodeOffset(uint offset) => offset >> 1;
    public static int DenormalizeStackSlot(int x) => x << 3;
    public static uint DenormalizeSizeOfStackArea(uint size) => size << 3;

    public static int GENERICS_INST_CONTEXT_STACK_SLOT_ENCBASE => 6;

    public static int GS_COOKIE_STACK_SLOT_ENCBASE => 6;
    public static int CODE_LENGTH_ENCBASE => 8;

    public static int STACK_BASE_REGISTER_ENCBASE => 2;
    public static int SIZE_OF_STACK_AREA_ENCBASE => 3;
    public static int SIZE_OF_EDIT_AND_CONTINUE_PRESERVED_AREA_ENCBASE => 4;
    public static int SIZE_OF_EDIT_AND_CONTINUE_FIXED_STACK_FRAME_ENCBASE => 4;
    public static int REVERSE_PINVOKE_FRAME_ENCBASE => 6;
    public static int NUM_REGISTERS_ENCBASE => 3;
    public static int NUM_STACK_SLOTS_ENCBASE => 2;
    public static int NUM_UNTRACKED_SLOTS_ENCBASE => 1;
    public static int NORM_PROLOG_SIZE_ENCBASE => 5;
    public static int NORM_EPILOG_SIZE_ENCBASE => 3;
    public static int INTERRUPTIBLE_RANGE_DELTA1_ENCBASE => 6;
    public static int INTERRUPTIBLE_RANGE_DELTA2_ENCBASE => 6;
    public static int REGISTER_ENCBASE => 3;
    public static int REGISTER_DELTA_ENCBASE => 2;
    public static int STACK_SLOT_ENCBASE => 6;
    public static int STACK_SLOT_DELTA_ENCBASE => 4;
    public static int NUM_SAFE_POINTS_ENCBASE => 3;
    public static int NUM_INTERRUPTIBLE_RANGES_ENCBASE => 1;

    public static bool HAS_FIXED_STACK_PARAMETER_SCRATCH_AREA => true;

    // RISCV64 scratch registers: RA (1), T0-T2 (5-7), A0-A7 (10-17), T3-T6 (28-31)
    // See gcinfodecoder.cpp IsScratchRegister for TARGET_RISCV64
    public static bool IsScratchRegister(uint regNum)
        => regNum == 1 || (regNum >= 5 && regNum <= 7) || (regNum >= 10 && regNum <= 17) || regNum >= 28;
}