BranchInstruction.cs

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namespace System.Linq.Expressions.Interpreter;
 
internal sealed class BranchInstruction : OffsetInstruction
{
    private static Instruction[][][] s_caches;
 
    internal readonly bool _hasResult;
 
    internal readonly bool _hasValue;
 
    public override Instruction[] Cache
    {
        get
        {
            if (s_caches == null)
            {
                s_caches = new Instruction[2][][]
                {
                    new Instruction[2][],
                    new Instruction[2][]
                };
            }
            return s_caches[ConsumedStack][ProducedStack] ?? (s_caches[ConsumedStack][ProducedStack] = new Instruction[32]);
        }
    }
 
    public override string InstructionName => "Branch";
 
    public override int ConsumedStack
    {
        get
        {
            if (!_hasValue)
            {
                return 0;
            }
            return 1;
        }
    }
 
    public override int ProducedStack
    {
        get
        {
            if (!_hasResult)
            {
                return 0;
            }
            return 1;
        }
    }
 
    internal BranchInstruction()
        : this(hasResult: false, hasValue: false)
    {
    }
 
    public BranchInstruction(bool hasResult, bool hasValue)
    {
        _hasResult = hasResult;
        _hasValue = hasValue;
    }
 
    public override int Run(InterpretedFrame frame)
    {
        return _offset;
    }
}