MethodDebugInformationTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct MethodDebugInformationTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _isDocumentRefSmall;
 
    private readonly bool _isBlobHeapRefSizeSmall;
 
    private readonly int _sequencePointsOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal MethodDebugInformationTableReader(int numberOfRows, int documentRefSize, int blobHeapRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _isDocumentRefSmall = documentRefSize == 2;
        _isBlobHeapRefSizeSmall = blobHeapRefSize == 2;
        _sequencePointsOffset = documentRefSize;
        RowSize = _sequencePointsOffset + blobHeapRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal DocumentHandle GetDocument(MethodDebugInformationHandle handle)
    {
        int offset = (handle.RowId - 1) * RowSize;
        return DocumentHandle.FromRowId(Block.PeekReference(offset, _isDocumentRefSmall));
    }
 
    internal BlobHandle GetSequencePoints(MethodDebugInformationHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return BlobHandle.FromOffset(Block.PeekHeapReference(num + _sequencePointsOffset, _isBlobHeapRefSizeSmall));
    }
}