LeaveExceptionHandlerInstruction.cs

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namespace System.Linq.Expressions.Interpreter;
 
internal sealed class LeaveExceptionHandlerInstruction : IndexedBranchInstruction
{
    private static readonly LeaveExceptionHandlerInstruction[] s_cache = new LeaveExceptionHandlerInstruction[64];
 
    private readonly bool _hasValue;
 
    public override string InstructionName => "LeaveExceptionHandler";
 
    public override int ConsumedStack
    {
        get
        {
            if (!_hasValue)
            {
                return 0;
            }
            return 1;
        }
    }
 
    public override int ProducedStack
    {
        get
        {
            if (!_hasValue)
            {
                return 0;
            }
            return 1;
        }
    }
 
    private LeaveExceptionHandlerInstruction(int labelIndex, bool hasValue)
        : base(labelIndex)
    {
        _hasValue = hasValue;
    }
 
    internal static LeaveExceptionHandlerInstruction Create(int labelIndex, bool hasValue)
    {
        if (labelIndex < 32)
        {
            int num = (2 * labelIndex) | (hasValue ? 1 : 0);
            return s_cache[num] ?? (s_cache[num] = new LeaveExceptionHandlerInstruction(labelIndex, hasValue));
        }
        return new LeaveExceptionHandlerInstruction(labelIndex, hasValue);
    }
 
    public override int Run(InterpretedFrame frame)
    {
        return GetLabel(frame).Index - frame.InstructionIndex;
    }
}