add misc handlers, cleanup and fixes

X86Disassembler/X86/Handlers/Misc/IretHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Misc;
+
+/// <summary>
+/// Handler for IRET/IRETD instruction (0xCF)
+/// </summary>
+public class IretHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the IretHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public IretHandler(InstructionDecoder decoder)
+        : base(decoder)
+    {
+    }
+
+    /// <summary>
+    /// Checks if this handler can decode the given opcode
+    /// </summary>
+    /// <param name="opcode">The opcode to check</param>
+    /// <returns>True if this handler can decode the opcode</returns>
+    public override bool CanHandle(byte opcode)
+    {
+        // IRET/IRETD is encoded as 0xCF
+        return opcode == 0xCF;
+    }
+
+    /// <summary>
+    /// Decodes an IRET/IRETD instruction
+    /// </summary>
+    /// <param name="opcode">The opcode of the instruction</param>
+    /// <param name="instruction">The instruction object to populate</param>
+    /// <returns>True if the instruction was successfully decoded</returns>
+    public override bool Decode(byte opcode, Instruction instruction)
+    {
+        // Set the instruction type
+        instruction.Type = InstructionType.Iret;
+        
+        // IRET/IRETD has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}