MethodSpecTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct MethodSpecTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _IsMethodDefOrRefRefSizeSmall;
 
    private readonly bool _IsBlobHeapRefSizeSmall;
 
    private readonly int _MethodOffset;
 
    private readonly int _InstantiationOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal MethodSpecTableReader(int numberOfRows, int methodDefOrRefRefSize, int blobHeapRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _IsMethodDefOrRefRefSizeSmall = methodDefOrRefRefSize == 2;
        _IsBlobHeapRefSizeSmall = blobHeapRefSize == 2;
        _MethodOffset = 0;
        _InstantiationOffset = _MethodOffset + methodDefOrRefRefSize;
        RowSize = _InstantiationOffset + blobHeapRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal EntityHandle GetMethod(MethodSpecificationHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return MethodDefOrRefTag.ConvertToHandle(Block.PeekTaggedReference(num + _MethodOffset, _IsMethodDefOrRefRefSizeSmall));
    }
 
    internal BlobHandle GetInstantiation(MethodSpecificationHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return BlobHandle.FromOffset(Block.PeekHeapReference(num + _InstantiationOffset, _IsBlobHeapRefSizeSmall));
    }
}