EnterTryFaultInstruction.cs

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namespace System.Linq.Expressions.Interpreter;
 
internal sealed class EnterTryFaultInstruction : IndexedBranchInstruction
{
    private TryFaultHandler _tryHandler;
 
    public override string InstructionName => "EnterTryFault";
 
    public override int ProducedContinuations => 1;
 
    internal TryFaultHandler Handler => _tryHandler;
 
    internal EnterTryFaultInstruction(int targetIndex)
        : base(targetIndex)
    {
    }
 
    internal void SetTryHandler(TryFaultHandler tryHandler)
    {
        _tryHandler = tryHandler;
    }
 
    public override int Run(InterpretedFrame frame)
    {
        frame.PushContinuation(_labelIndex);
        int instructionIndex = frame.InstructionIndex;
        frame.InstructionIndex++;
        Instruction[] instructions = frame.Interpreter.Instructions.Instructions;
        bool flag = false;
        try
        {
            int num = frame.InstructionIndex;
            while (num >= _tryHandler.TryStartIndex && num < _tryHandler.TryEndIndex)
            {
                num = (frame.InstructionIndex = num + instructions[num].Run(frame));
            }
            flag = true;
            frame.RemoveContinuation();
            frame.InstructionIndex += instructions[num].Run(frame);
        }
        finally
        {
            if (!flag)
            {
                int num2 = (frame.InstructionIndex = _tryHandler.FinallyStartIndex);
                while (num2 >= _tryHandler.FinallyStartIndex && num2 < _tryHandler.FinallyEndIndex)
                {
                    num2 = (frame.InstructionIndex = num2 + instructions[num2].Run(frame));
                }
            }
        }
        return frame.InstructionIndex - instructionIndex;
    }
}