Add EvaluationResult Scheme for arrays.

src/mono/wasm/debugger/BrowserDebugProxy/DevToolsHelper.cs

@@ -473,6 +473,7 @@ internal sealed class PerScopeCache
         public Dictionary<string, JObject> Locals { get; } = new Dictionary<string, JObject>();
         public Dictionary<string, JObject> MemberReferences { get; } = new Dictionary<string, JObject>();
         public Dictionary<string, JObject> ObjectFields { get; } = new Dictionary<string, JObject>();
+        public Dictionary<string, JObject> EvaluationResults { get; } = new();
         public PerScopeCache(JArray objectValues)
         {
             foreach (var objectValue in objectValues)

src/mono/wasm/debugger/BrowserDebugProxy/EvaluateExpression.cs

@@ -453,7 +453,7 @@ internal static async Task<JObject> CompileAndRunTheExpression(
                 newScript = script.ContinueWith(
                 string.Join("\n", replacer.variableDefinitions) + "\nreturn " + syntaxTree.ToString());
                 var state = await newScript.RunAsync(cancellationToken: token);
-                return JObject.FromObject(ConvertCLRToJSType(state.ReturnValue));
+                return JObject.FromObject(resolver.ConvertCSharpToJSType(state.ReturnValue, state.ReturnValue.GetType()));
             }
             catch (CompilationErrorException cee)
             {

src/mono/wasm/debugger/BrowserDebugProxy/MemberReferenceResolver.cs

@@ -12,11 +12,13 @@
 using System.Collections.Generic;
 using System.Net.WebSockets;
 using BrowserDebugProxy;
+using System.Globalization;
 
 namespace Microsoft.WebAssembly.Diagnostics
 {
     internal sealed class MemberReferenceResolver
     {
+        private static int evaluationResultObjectId;
         private SessionId sessionId;
         private int scopeId;
         private MonoProxy proxy;
@@ -543,5 +545,88 @@ async Task<int> FindMethodIdOnLinqEnumerable(IList<int> typeIds, string methodNa
                 return 0;
             }
         }
+
+        private static readonly HashSet<Type> NumericTypes = new HashSet<Type>
+        {
+            typeof(decimal), typeof(byte), typeof(sbyte),
+            typeof(short), typeof(ushort),
+            typeof(int), typeof(uint),
+            typeof(float), typeof(double)
+        };
+
+        public object ConvertCSharpToJSType(object v, Type type)
+        {
+            if (v == null)
+                return new { type = "object", subtype = "null", className = type?.ToString(), description = type?.ToString() };
+            if (v is string s)
+                return new { type = "string", value = s, description = s };
+            if (v is char c)
+                return new { type = "symbol", value = c, description = $"{(int)c} '{c}'" };
+            if (NumericTypes.Contains(v.GetType()))
+                return new { type = "number", value = v, description = Convert.ToDouble(v).ToString(CultureInfo.InvariantCulture) };
+            if (v is bool)
+                return new { type = "boolean", value = v, description = v.ToString().ToLowerInvariant(), className = type.ToString() };
+            if (v is JObject)
+                return v;
+            if (v is Array arr)
+            {
+                return CacheEvaluationResult(
+                    JObject.FromObject(
+                        new
+                        {
+                            type = "object",
+                            subtype = "array",
+                            value = new JArray(arr.Cast<object>().Select((val, idx) => JObject.FromObject(
+                                new
+                                {
+                                    value = ConvertCSharpToJSType(val, val.GetType()),
+                                    name = $"{idx}"
+                                }))),
+                            description = v.ToString(),
+                            className = type.ToString()
+                        }));
+            }
+            return new { type = "object", value = v, description = v.ToString(), className = type.ToString() };
+        }
+
+        private JObject CacheEvaluationResult(JObject value)
+        {
+            if (IsDuplicated(value, out JObject duplicate))
+                return value;
+
+            var evalResultId = Interlocked.Increment(ref evaluationResultObjectId);
+            string id = $"dotnet:evaluationResult:{evalResultId}";
+            if (!value.TryAdd("objectId", id))
+            {
+                logger.LogWarning($"EvaluationResult cache request passed with ID: {value["objectId"].Value<string>()}. Overwritting it with a automatically assigned ID: {id}.");
+                value["objectId"] = id;
+            }
+            scopeCache.EvaluationResults.Add(id, value);
+            return value;
+
+            bool IsDuplicated(JObject er, out JObject duplicate)
+            {
+                var type = er["type"].Value<string>();
+                var subtype = er["subtype"].Value<string>();
+                var value = er["value"];
+                var description = er["description"].Value<string>();
+                var className = er["className"].Value<string>();
+                duplicate = scopeCache.EvaluationResults.FirstOrDefault(
+                    pair => pair.Value["type"].Value<string>() == type
+                    && pair.Value["subtype"].Value<string>() == subtype
+                    && pair.Value["description"].Value<string>() == description
+                    && pair.Value["className"].Value<string>() == className
+                    && JToken.DeepEquals(pair.Value["value"], value)).Value;
+                return duplicate != null;
+            }
+        }
+
+        public JObject TryGetEvaluationResult(string id)
+        {
+            JObject val;
+            if (!scopeCache.EvaluationResults.TryGetValue(id, out val))
+                logger.LogError($"EvaluationResult of ID: {id} does not exist in the cache.");
+            return val;
+        }
     }
 }

src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs

@@ -801,6 +801,9 @@ internal async Task<ValueOrError<GetMembersResult>> RuntimeGetObjectMembers(Sess
                         return value_json_str != null
                                     ? ValueOrError<GetMembersResult>.WithValue(GetMembersResult.FromValues(JArray.Parse(value_json_str)))
                                     : ValueOrError<GetMembersResult>.WithError(res);
+                    case "evaluationResult":
+                        JArray evaluationRes = (JArray)context.SdbAgent.GetEvaluationResultProperties(objectId.ToString());
+                        return ValueOrError<GetMembersResult>.WithValue(GetMembersResult.FromValues(evaluationRes));
                     default:
                         return ValueOrError<GetMembersResult>.WithError($"RuntimeGetProperties: unknown object id scheme: {objectId.Scheme}");
                 }

src/mono/wasm/debugger/BrowserDebugProxy/MonoSDBHelper.cs

@@ -1387,6 +1387,14 @@ public async Task<int> GetAssemblyFromType(int type_id, CancellationToken token)
             return retDebuggerCmdReader.ReadInt32();
         }
 
+        public JToken GetEvaluationResultProperties(string id)
+        {
+            ExecutionContext context = proxy.GetContext(sessionId);
+            var resolver = new MemberReferenceResolver(proxy, context, sessionId, context.CallStack.First().Id, logger);
+            var evaluationResult = resolver.TryGetEvaluationResult(id);
+            return evaluationResult["value"];
+        }
+
         public async Task<string> GetValueFromDebuggerDisplayAttribute(DotnetObjectId dotnetObjectId, int typeId, CancellationToken token)
         {
             string expr = "";

src/mono/wasm/debugger/DebuggerTestSuite/DebuggerTestFirefox.cs

@@ -313,7 +313,7 @@ internal override async Task<JToken> GetProperties(string id, JToken fn_args = n
             }
             return ret;
         }
-        if (id.StartsWith("dotnet:valuetype:") || id.StartsWith("dotnet:object:") || id.StartsWith("dotnet:array:") || id.StartsWith("dotnet:pointer:"))
+        if (id.StartsWith("dotnet:evaluationResult:") || id.StartsWith("dotnet:valuetype:") || id.StartsWith("dotnet:object:") || id.StartsWith("dotnet:array:") || id.StartsWith("dotnet:pointer:"))
         {
             JArray ret = new ();
             var o = JObject.FromObject(new

src/mono/wasm/debugger/DebuggerTestSuite/EvaluateOnCallFrameTests.cs

@@ -1201,5 +1201,24 @@ await EvaluateOnCallFrameAndCheck(id,
                     ("localFloat.ToString()", TString(floatLocalVal["description"]?.Value<string>())),
                     ("localDouble.ToString()", TString(doubleLocalVal["description"]?.Value<string>())));
              });
+
+        [Fact]
+        public async Task EvaluateMethodsOnPrimitiveTypesReturningObjects() =>  await CheckInspectLocalsAtBreakpointSite(
+            "DebuggerTests.PrimitiveTypeMethods", "Evaluate", 11, "Evaluate",
+            "window.setTimeout(function() { invoke_static_method ('[debugger-test] DebuggerTests.PrimitiveTypeMethods:Evaluate'); })",
+            wait_for_event_fn: async (pause_location) =>
+            {
+                var id = pause_location["callFrames"][0]["callFrameId"].Value<string>();
+
+                var (res, _) = await EvaluateOnCallFrame(id, "test.propString.Split('_', 3, System.StringSplitOptions.TrimEntries)");
+                var props = res["value"] ?? await GetProperties(res["objectId"]?.Value<string>()); // in firefox getProps is necessary
+                var expected_props = new [] { TString("s"), TString("t"), TString("r") };
+                await CheckProps(props, expected_props, "props#1");
+
+                (res, _) = await EvaluateOnCallFrame(id, "localString.Split('*', 3, System.StringSplitOptions.RemoveEmptyEntries)");
+                props = res["value"] ?? await GetProperties(res["objectId"]?.Value<string>());
+                expected_props = new [] { TString("S"), TString("T"), TString("R") };
+                await CheckProps(props, expected_props, "props#2");
+             });
     }
 }