OffsetInstruction.cs

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using System.Collections.Generic;
 
namespace System.Linq.Expressions.Interpreter;
 
internal abstract class OffsetInstruction : Instruction
{
    protected int _offset = int.MinValue;
 
    public abstract Instruction[] Cache { get; }
 
    public Instruction Fixup(int offset)
    {
        _offset = offset;
        Instruction[] cache = Cache;
        if (cache != null && offset >= 0 && offset < cache.Length)
        {
            return cache[offset] ?? (cache[offset] = this);
        }
        return this;
    }
 
    public override string ToDebugString(int instructionIndex, object cookie, Func<int, int> labelIndexer, IReadOnlyList<object> objects)
    {
        return ToString() + ((_offset != int.MinValue) ? (" -> " + (instructionIndex + _offset)) : "");
    }
 
    public override string ToString()
    {
        return InstructionName + ((_offset == int.MinValue) ? "(?)" : ("(" + _offset + ")"));
    }
}