StateMachineMethodTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct StateMachineMethodTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _isMethodRefSizeSmall;
 
    private readonly int _kickoffMethodOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal StateMachineMethodTableReader(int numberOfRows, bool declaredSorted, int methodRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _isMethodRefSizeSmall = methodRefSize == 2;
        _kickoffMethodOffset = methodRefSize;
        RowSize = _kickoffMethodOffset + methodRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
        if (numberOfRows > 0 && !declaredSorted)
        {
            Throw.TableNotSorted(TableIndex.StateMachineMethod);
        }
    }
 
    internal MethodDefinitionHandle FindKickoffMethod(int moveNextMethodRowId)
    {
        int num = Block.BinarySearchReference(NumberOfRows, RowSize, 0, (uint)moveNextMethodRowId, _isMethodRefSizeSmall);
        if (num < 0)
        {
            return default(MethodDefinitionHandle);
        }
        return GetKickoffMethod(num + 1);
    }
 
    private MethodDefinitionHandle GetKickoffMethod(int rowId)
    {
        int num = (rowId - 1) * RowSize;
        return MethodDefinitionHandle.FromRowId(Block.PeekReference(num + _kickoffMethodOffset, _isMethodRefSizeSmall));
    }
}