HasCustomAttributeTag.cs

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using System.Runtime.CompilerServices;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal static class HasCustomAttributeTag
{
    internal const int NumberOfBits = 5;
 
    internal const int LargeRowSize = 2048;
 
    internal const uint MethodDef = 0u;
 
    internal const uint Field = 1u;
 
    internal const uint TypeRef = 2u;
 
    internal const uint TypeDef = 3u;
 
    internal const uint Param = 4u;
 
    internal const uint InterfaceImpl = 5u;
 
    internal const uint MemberRef = 6u;
 
    internal const uint Module = 7u;
 
    internal const uint DeclSecurity = 8u;
 
    internal const uint Property = 9u;
 
    internal const uint Event = 10u;
 
    internal const uint StandAloneSig = 11u;
 
    internal const uint ModuleRef = 12u;
 
    internal const uint TypeSpec = 13u;
 
    internal const uint Assembly = 14u;
 
    internal const uint AssemblyRef = 15u;
 
    internal const uint File = 16u;
 
    internal const uint ExportedType = 17u;
 
    internal const uint ManifestResource = 18u;
 
    internal const uint GenericParam = 19u;
 
    internal const uint GenericParamConstraint = 20u;
 
    internal const uint MethodSpec = 21u;
 
    internal const uint TagMask = 31u;
 
    internal const uint InvalidTokenType = uint.MaxValue;
 
    internal static uint[] TagToTokenTypeArray = new uint[32]
    {
        100663296u, 67108864u, 16777216u, 33554432u, 134217728u, 150994944u, 167772160u, 0u, 234881024u, 385875968u,
        335544320u, 285212672u, 436207616u, 452984832u, 536870912u, 587202560u, 637534208u, 654311424u, 671088640u, 704643072u,
        738197504u, 721420288u, 4294967295u, 4294967295u, 4294967295u, 4294967295u, 4294967295u, 4294967295u, 4294967295u, 4294967295u,
        4294967295u, 4294967295u
    };
 
    internal const TableMask TablesReferenced = TableMask.Module | TableMask.TypeRef | TableMask.TypeDef | TableMask.Field | TableMask.MethodDef | TableMask.Param | TableMask.InterfaceImpl | TableMask.MemberRef | TableMask.DeclSecurity | TableMask.StandAloneSig | TableMask.Event | TableMask.Property | TableMask.ModuleRef | TableMask.TypeSpec | TableMask.Assembly | TableMask.AssemblyRef | TableMask.File | TableMask.ExportedType | TableMask.ManifestResource | TableMask.GenericParam | TableMask.MethodSpec | TableMask.GenericParamConstraint;
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal static EntityHandle ConvertToHandle(uint hasCustomAttribute)
    {
        uint num = TagToTokenTypeArray[hasCustomAttribute & 0x1F];
        uint num2 = hasCustomAttribute >> 5;
        if (num == uint.MaxValue || (num2 & 0xFF000000u) != 0)
        {
            Throw.InvalidCodedIndex();
        }
        return new EntityHandle(num | num2);
    }
 
    internal static uint ConvertToTag(EntityHandle handle)
    {
        uint type = handle.Type;
        uint rowId = (uint)handle.RowId;
        return (type >> 24) switch
        {
            6u => (rowId << 5) | 0u, 
            4u => (rowId << 5) | 1u, 
            1u => (rowId << 5) | 2u, 
            2u => (rowId << 5) | 3u, 
            8u => (rowId << 5) | 4u, 
            9u => (rowId << 5) | 5u, 
            10u => (rowId << 5) | 6u, 
            0u => (rowId << 5) | 7u, 
            14u => (rowId << 5) | 8u, 
            23u => (rowId << 5) | 9u, 
            20u => (rowId << 5) | 0xAu, 
            17u => (rowId << 5) | 0xBu, 
            26u => (rowId << 5) | 0xCu, 
            27u => (rowId << 5) | 0xDu, 
            32u => (rowId << 5) | 0xEu, 
            35u => (rowId << 5) | 0xFu, 
            38u => (rowId << 5) | 0x10u, 
            39u => (rowId << 5) | 0x11u, 
            40u => (rowId << 5) | 0x12u, 
            42u => (rowId << 5) | 0x13u, 
            44u => (rowId << 5) | 0x14u, 
            43u => (rowId << 5) | 0x15u, 
            _ => 0u, 
        };
    }
}