Add: print out the stack

src/Neo.VM/EvaluationStack.cs

@@ -1,10 +1,10 @@
 // Copyright (C) 2016-2023 The Neo Project.
-// 
-// The neo-vm is free software distributed under the MIT software license, 
+//
+// The neo-vm is free software distributed under the MIT software license,
 // see the accompanying file LICENSE in the main directory of the
-// project or http://www.opensource.org/licenses/mit-license.php 
+// project or http://www.opensource.org/licenses/mit-license.php
 // for more details.
-// 
+//
 // Redistribution and use in source and binary forms with or without
 // modifications are permitted.
 
@@ -35,6 +35,26 @@ internal EvaluationStack(ReferenceCounter referenceCounter)
         /// </summary>
         public int Count => innerList.Count;
 
+        public override string ToString()
+        {
+            return $@"[{string.Join(", ", innerList.Select(p =>
+                    {
+                        var value = p.Type switch
+                        {
+                            StackItemType.Pointer => $"({((Pointer)p).Position})",
+                            StackItemType.Boolean => $"({p.GetBoolean()})",
+                            StackItemType.Integer => $"({p.GetInteger()})",
+                            StackItemType.ByteString => $"(\"{p.GetString()}\")",
+                            StackItemType.Array
+                                or StackItemType.Map
+                                or StackItemType.Struct => $"({((CompoundType)p).Count})",
+                            _ => ""
+                        };
+                        return $"{p.Type.ToString()}{value}";
+                    }
+                    ))}]";
+        }
+
         internal void Clear()
         {
             foreach (StackItem item in innerList)

tests/Neo.VM.Tests/UtEvaluationStack.cs

@@ -187,5 +187,18 @@ public void TestReverse()
             Assert.IsTrue(stack.Pop<Integer>().Equals(1));
             Assert.ThrowsException<ArgumentOutOfRangeException>(() => stack.Pop<Integer>().Equals(0));
         }
+
+        [TestMethod]
+        public void TestToString()
+        {
+            var stack = new EvaluationStack(new ReferenceCounter());
+
+            stack.Insert(0, 3);
+            stack.Insert(1, 1);
+            stack.Insert(2, "test");
+            stack.Insert(3, true);
+
+            Assert.AreEqual("[Boolean(True), ByteString(\"test\"), Integer(1), Integer(3)]", stack.ToString());
+        }
     }
 }