[wasm][debugger] Hide members from classes that don't have debug information

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

@@ -701,7 +701,9 @@ internal sealed class TypeInfo
         internal int Token { get; }
         internal string Namespace { get; }
         internal bool IsCompilerGenerated { get; }
+        private bool NonUserCode { get; }
         public string FullName { get; }
+        internal bool IsNonUserCode => assembly.pdbMetadataReader == null || NonUserCode;
         public List<MethodInfo> Methods { get; } = new();
         public Dictionary<string, DebuggerBrowsableState?> DebuggerBrowsableFields = new();
         public Dictionary<string, DebuggerBrowsableState?> DebuggerBrowsableProperties = new();
@@ -769,8 +771,15 @@ internal TypeInfo(AssemblyInfo assembly, TypeDefinitionHandle typeHandle, TypeDe
                     continue;
                 var container = metadataReader.GetMemberReference((MemberReferenceHandle)ctorHandle).Parent;
                 var attributeName = assembly.EnCGetString(metadataReader.GetTypeReference((TypeReferenceHandle)container).Name);
-                if (attributeName == nameof(CompilerGeneratedAttribute))
-                    IsCompilerGenerated = true;
+                switch (attributeName)
+                {
+                    case nameof(CompilerGeneratedAttribute):
+                        IsCompilerGenerated = true;
+                        break;
+                    case nameof(DebuggerNonUserCodeAttribute):
+                        NonUserCode = true;
+                        break;
+                }
             }
 
             void AppendToBrowsable(Dictionary<string, DebuggerBrowsableState?> dict, CustomAttributeHandleCollection customAttrs, string fieldName)

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

@@ -71,6 +71,7 @@ private static async Task<JObject> ReadFieldValue(
                 FieldAttributes.Public => "result",
                 _ => "internal"
             };
+
             if (field.IsBackingField)
             {
                 fieldValue["__isBackingField"] = true;
@@ -571,9 +572,15 @@ public static async Task<GetMembersResult> GetObjectMemberValues(
                 string typeName = await sdbHelper.GetTypeName(typeId, token);
                 // 0th id is for the object itself, and then its ancestors
                 bool isOwn = i == 0;
+                var typeInfo = await sdbHelper.GetTypeInfo(typeId, token);
+
+                if (typeInfo.Info.IsNonUserCode && getCommandType.HasFlag(GetObjectCommandOptions.JustMyCode))
+                    break;
+
                 IReadOnlyList<FieldTypeClass> thisTypeFields = await sdbHelper.GetTypeFields(typeId, token);
                 if (!includeStatic)
                     thisTypeFields = thisTypeFields.Where(f => !f.Attributes.HasFlag(FieldAttributes.Static)).ToList();
+
                 if (thisTypeFields.Count > 0)
                 {
                     var allFields = await ExpandFieldValues(

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

@@ -745,6 +745,8 @@ internal async Task<ValueOrError<GetMembersResult>> RuntimeGetObjectMembers(Sess
                 if (args["forDebuggerDisplayAttribute"]?.Value<bool>() == true)
                     getObjectOptions |= GetObjectCommandOptions.ForDebuggerDisplayAttribute;
             }
+            if (JustMyCode)
+                getObjectOptions |= GetObjectCommandOptions.JustMyCode;
             try
             {
                 switch (objectId.Scheme)

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

@@ -59,7 +59,8 @@ internal enum GetObjectCommandOptions
         OwnProperties = 4,
         ForDebuggerProxyAttribute = 8,
         ForDebuggerDisplayAttribute = 16,
-        WithProperties = 32
+        WithProperties = 32,
+        JustMyCode = 64
     }
 
     internal enum CommandSet {

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

@@ -1039,5 +1039,49 @@ await EvaluateAndCheck(
                 }
             );
         }
+
+        [Theory]
+        [InlineData("ClassInheritsFromClassWithoutDebugSymbols", 1287, true)]
+        [InlineData("ClassInheritsFromClassWithoutDebugSymbols", 1287, false)]
+        [InlineData("ClassInheritsFromNonUserCodeClass", 1335, true)]
+        [InlineData("ClassInheritsFromNonUserCodeClass", 1335, false)]
+        public async Task InspectThisThatInheritsFromClassNonUserCode(string class_name, int line, bool jmc)
+        {
+            await SetJustMyCode(jmc);
+            var expression = "{{ invoke_static_method('[debugger-test] " + class_name + ":Run'); }}";
+
+            await EvaluateAndCheck(
+                "window.setTimeout(function() {" + expression + "; }, 1);",
+                "dotnet://debugger-test.dll/debugger-test.cs", line, 8,
+                $"{class_name}.CallMethod",
+                locals_fn: async (locals) =>
+                {
+                    var this_props = await GetObjectOnLocals(locals, "this");
+                    if (jmc)
+                    {
+                        await CheckProps(this_props, new
+                        {
+                            myField = TNumber(0),
+                        }, "this_props", num_fields: 1);
+                    }
+                    else
+                    {
+                        Console.WriteLine(this_props);
+                        await CheckProps(this_props, new
+                        {
+                            propA = TNumber(10),
+                            propB = TNumber(20),
+                            propC = TNumber(30),
+                            d = TNumber(40),
+                            e = TNumber(50),
+                            f = TNumber(60),
+                            G = TGetter("G"),
+                            H = TGetter("H"),
+                            myField = TNumber(0),
+                        }, "this_props", num_fields: 9);
+                    }
+                }
+            );
+        }
     }
 }

src/mono/wasm/debugger/tests/debugger-test-without-debug-symbols-to-load/debugger-test-without-debug-symbols-to-load.csproj

@@ -0,0 +1,6 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <DebugType>none</DebugType>
+    <DebugSymbols>false</DebugSymbols>  
+  </PropertyGroup>
+</Project>

src/mono/wasm/debugger/tests/debugger-test-without-debug-symbols-to-load/test.cs

@@ -0,0 +1,35 @@
+using System;
+
+namespace DebuggerTests
+{
+    public class ClassWithoutDebugSymbolsToInherit
+    {
+        private int propA {get;}
+        public int propB {get;}
+        protected int propC {get;}
+        private int d;
+        public int e;
+        protected int f;
+        public int G 
+        { 
+            get {return f + 1;} 
+        }
+        public int H => f;
+
+        public ClassWithoutDebugSymbolsToInherit()
+        {
+            propA = 10;
+            propB = 20;
+            propC = 30;
+            d = 40;
+            e = 50;
+            f = 60;
+            Console.WriteLine(propA);
+            Console.WriteLine(propB);
+            Console.WriteLine(propC);
+            Console.WriteLine(d);
+            Console.WriteLine(e);
+            Console.WriteLine(f);
+        }
+    }
+}

src/mono/wasm/debugger/tests/debugger-test/debugger-test.cs

@@ -1275,3 +1275,66 @@ public static void MethodWithHiddenLinesAtTheEnd3()
 #line default
 }
 
+public class ClassInheritsFromClassWithoutDebugSymbols : DebuggerTests.ClassWithoutDebugSymbolsToInherit
+{
+    public static void Run()
+    {
+        var myVar = new ClassInheritsFromClassWithoutDebugSymbols();
+        myVar.CallMethod();
+    }
+
+    public void CallMethod()
+    {
+        System.Diagnostics.Debugger.Break();
+    }
+
+    public int myField;
+}
+
+[System.Diagnostics.DebuggerNonUserCode]
+public class ClassNonUserCodeToInherit
+{
+    private int propA {get;}
+    public int propB {get;}
+    protected int propC {get;}
+    private int d;
+    public int e;
+    protected int f;
+    public int G 
+    { 
+        get {return f + 1;} 
+    }
+    public int H => f;
+
+    public ClassNonUserCodeToInherit()
+    {
+        propA = 10;
+        propB = 20;
+        propC = 30;
+        d = 40;
+        e = 50;
+        f = 60;
+        Console.WriteLine(propA);
+        Console.WriteLine(propB);
+        Console.WriteLine(propC);
+        Console.WriteLine(d);
+        Console.WriteLine(e);
+        Console.WriteLine(f);
+    }
+}
+
+public class ClassInheritsFromNonUserCodeClass : ClassNonUserCodeToInherit
+{
+    public static void Run()
+    {
+        var myVar = new ClassInheritsFromNonUserCodeClass();
+        myVar.CallMethod();
+    }
+
+    public void CallMethod()
+    {
+        System.Diagnostics.Debugger.Break();
+    }
+
+    public int myField;
+}

src/mono/wasm/debugger/tests/debugger-test/debugger-test.csproj

@@ -21,6 +21,7 @@
     <ProjectReference Include="..\ApplyUpdateReferencedAssembly\ApplyUpdateReferencedAssembly.csproj" />
     <ProjectReference Include="..\debugger-test-special-char-in-path-#@\debugger-test-special-char-in-path.csproj" ReferenceOutputAssembly="false" />
     <ProjectReference Include="..\debugger-test-with-source-link\debugger-test-with-source-link.csproj" ReferenceOutputAssembly="false" Private="true" />
+    <ProjectReference Include="..\debugger-test-without-debug-symbols-to-load\debugger-test-without-debug-symbols-to-load.csproj" Private="true" />
     <!-- loaded by *tests*, and not the test app -->
     <ProjectReference Include="..\lazy-debugger-test-embedded\lazy-debugger-test-embedded.csproj" ReferenceOutputAssembly="false" Private="true" />
 
@@ -44,14 +45,14 @@
       <WasmMainJSPath>debugger-main.js</WasmMainJSPath>
       <!-- -1 enabled debugging and disables debug logging. -->
       <WasmDebugLevel Condition="'$(WasmDebugLevel)'==''">-1</WasmDebugLevel>
-
       <WasmResolveAssembliesBeforeBuild>true</WasmResolveAssembliesBeforeBuild>
     </PropertyGroup>
 
     <ItemGroup>
       <WasmAssembliesToBundle Include="$(OutDir)\$(TargetFileName)" />
       <WasmAssembliesToBundle Include="$(OutDir)\debugger-test-special-char-in-path.dll" />
       <WasmAssembliesToBundle Include="$(OutDir)\debugger-test-with-source-link.dll" />
+      <WasmAssembliesToBundle Include="$(OutDir)\debugger-test-without-debug-symbols-to-load.dll" />
       <WasmAssembliesToBundle Include="$(MicrosoftNetCoreAppRuntimePackRidDir)\lib\$(NetCoreappCurrent)\System.Runtime.InteropServices.JavaScript.dll" />
 
       <!-- Assemblies only dynamically loaded -->
@@ -63,6 +64,7 @@
 
       <WasmAssemblySearchPaths Include="$(MicrosoftNetCoreAppRuntimePackRidDir)native"/>
       <WasmAssemblySearchPaths Include="$(MicrosoftNetCoreAppRuntimePackRidDir)lib\$(NetCoreAppCurrent)"/>
+      <WasmAssemblySearchPaths Include="$(OutDir)"/>
     </ItemGroup>
   </Target>
   <Target Name="PreserveEnCAssembliesFromLinking"