Implement Ldelem etc (#72)

WoofWare.PawPrint.Test/sourcesPure/Ldelema.cs

@@ -0,0 +1,66 @@
+using System;
+
+/// <summary>
+/// A simple value type used for testing ldelema.
+/// </summary>
+public struct TestStruct
+{
+    public int Value;
+}
+
+public class Program
+{
+    /// <summary>
+    /// Modifies a TestStruct instance by reference. Calling this with an array element
+    /// (e.g., `ModifyStruct(ref array[i], ...)` ) will cause the C# compiler to
+    /// generate an `ldelema` instruction.
+    /// </summary>
+    /// <param name="s">A reference to the TestStruct to modify.</param>
+    /// <param name="newValue">The new value to assign.</param>
+    public static void ModifyStruct(ref TestStruct s, int newValue)
+    {
+        s.Value = newValue;
+    }
+
+    /// <summary>
+    /// Modifies a string reference.
+    /// </summary>
+    /// <param name="s">A reference to a string variable.</param>
+    /// <param name="newValue">The new string to assign.</param>
+    public static void ModifyStringRef(ref string s, string newValue)
+    {
+        s = newValue;
+    }
+
+    /// <summary>
+    /// Main entry point for the ldelema test.
+    /// </summary>
+    /// <returns>0 if all tests pass, otherwise a non-zero error code.</returns>
+    public static int Main(string[] args)
+    {
+        // --- Test 1: Modifying a value type element in an array ---
+        TestStruct[] structArray = new TestStruct[5];
+        structArray[2].Value = 100;
+
+        // This call should generate an `ldelema` instruction to get the address of structArray[2].
+        ModifyStruct(ref structArray[2], 999);
+
+        if (structArray[2].Value != 999)
+        {
+            return 301; // Unique error code for this test
+        }
+
+        // --- Test 2: Modifying a reference type element in an array ---
+        string[] stringArray = new string[] { "alpha", "beta", "gamma" };
+
+        // This call should also generate an `ldelema` instruction.
+        ModifyStringRef(ref stringArray[1], "zeta");
+
+        if (stringArray[1] != "zeta")
+        {
+            return 302; // Unique error code for this test
+        }
+
+        return 0; // Success
+    }
+}