[browser][MT] JSType.OneWay -> JSType.DiscardNoWait

src/libraries/System.Runtime.InteropServices.JavaScript/gen/JSImportGenerator/JSGeneratorFactory.cs

@@ -42,8 +42,8 @@ ResolvedGenerator fail(string failReason)
                     return ResolvedGenerator.NotSupported(new(info, context));
 
                 // void
-                case { TypeInfo: JSSimpleTypeInfo(KnownManagedType.Void), JSType: JSTypeFlags.OneWay }:
-                    return ResolvedGenerator.Resolved(new VoidGenerator(MarshalerType.OneWay));
+                case { TypeInfo: JSSimpleTypeInfo(KnownManagedType.Void), JSType: JSTypeFlags.DiscardNoWait }:
+                    return ResolvedGenerator.Resolved(new VoidGenerator(MarshalerType.DiscardNoWait));
                 case { TypeInfo: JSSimpleTypeInfo(KnownManagedType.Void), JSType: JSTypeFlags.Discard }:
                 case { TypeInfo: JSSimpleTypeInfo(KnownManagedType.Void), JSType: JSTypeFlags.Void }:
                 case { TypeInfo: JSSimpleTypeInfo(KnownManagedType.Void), JSType: JSTypeFlags.None }:
@@ -55,8 +55,8 @@ ResolvedGenerator fail(string failReason)
                     return fail(SR.DiscardOnlyVoid);
 
                 // oneway no void
-                case { JSType: JSTypeFlags.OneWay }:
-                    return fail(SR.OneWayOnlyVoid);
+                case { JSType: JSTypeFlags.DiscardNoWait }:
+                    return fail(SR.DiscardNoWaitOnlyVoid);
 
                 // primitive
                 case { TypeInfo: JSSimpleTypeInfo simple }:

src/libraries/System.Runtime.InteropServices.JavaScript/gen/JSImportGenerator/JSTypeFlags.cs

@@ -22,7 +22,7 @@ internal enum JSTypeFlags : int
         MemoryView = 0x800,
         Any = 0x1000,
         Discard = 0x2000,
-        OneWay = 0x4000,
+        DiscardNoWait = 0x4000,
         Missing = 0x4000_0000,
     }
 }

src/libraries/System.Runtime.InteropServices.JavaScript/gen/JSImportGenerator/Resources/Strings.resx

@@ -184,8 +184,8 @@
   <data name="DiscardOnlyVoid" xml:space="preserve">
     <value>'JSType.Discard' could be only used with void return argument.</value>
   </data>
-  <data name="OneWayOnlyVoid" xml:space="preserve">
-    <value>'JSType.OneWay' could be only used with void returning method.</value>
+  <data name="DiscardNoWaitOnlyVoid" xml:space="preserve">
+    <value>'JSType.DiscardNoWait' could be only used with void returning method.</value>
   </data>
   <data name="FuncArgumentNotSupported" xml:space="preserve">
     <value>Type {0} is not supported as argument of marshaled function.</value>

src/libraries/System.Runtime.InteropServices.JavaScript/src/CompatibilitySuppressions.xml

@@ -14,13 +14,13 @@
   </Suppression>
   <Suppression>
     <DiagnosticId>CP0001</DiagnosticId>
-    <Target>T:System.Runtime.InteropServices.JavaScript.JSType.OneWay</Target>
+    <Target>T:System.Runtime.InteropServices.JavaScript.JSType.DiscardNoWait</Target>
     <Left>ref/net9.0/System.Runtime.InteropServices.JavaScript.dll</Left>
     <Right>runtimes/browser/lib/net9.0/System.Runtime.InteropServices.JavaScript.dll</Right>
   </Suppression>
   <Suppression>
     <DiagnosticId>CP0002</DiagnosticId>
-    <Target>M:System.Runtime.InteropServices.JavaScript.JSMarshalerType.get_OneWay</Target>
+    <Target>M:System.Runtime.InteropServices.JavaScript.JSMarshalerType.get_DiscardNoWait</Target>
     <Left>ref/net9.0/System.Runtime.InteropServices.JavaScript.dll</Left>
     <Right>runtimes/browser/lib/net9.0/System.Runtime.InteropServices.JavaScript.dll</Right>
   </Suppression>

src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Interop/JavaScriptImports.Generated.cs

@@ -57,7 +57,7 @@ internal static unsafe partial class JavaScriptImports
 
 #if DEBUG
         [JSImport("globalThis.console.log")]
-        [return: JSMarshalAs<JSType.OneWay>]
+        [return: JSMarshalAs<JSType.DiscardNoWait>] // this means that the message will arrive out of order, especially across threads.
         public static partial void Log([JSMarshalAs<JSType.String>] string message);
 #endif
     }

src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSFunctionBinding.cs

@@ -30,54 +30,51 @@ internal JSFunctionBinding() { }
         internal static volatile uint nextImportHandle = 1;
         internal int ImportHandle;
         internal bool IsAsync;
-        internal bool IsOneWay;
+        internal bool IsDiscardNoWait;
 #if DEBUG
         internal string? FunctionName;
 #endif
 
-        [StructLayout(LayoutKind.Sequential, Pack = 4)]
+        // keep in sync with JSBindingHeaderOffsets in marshal.ts
+        [StructLayout(LayoutKind.Explicit, Pack = 4)]
         internal struct JSBindingHeader
         {
             internal const int JSMarshalerSignatureHeaderSize = 4 * 8; // without Exception and Result
 
+            [FieldOffset(0)]
             public int Version;
+            [FieldOffset(4)]
             public int ArgumentCount;
+            [FieldOffset(8)]
             public int ImportHandle;
-            public int _Reserved;
+            [FieldOffset(16)]
             public int FunctionNameOffset;
+            [FieldOffset(20)]
             public int FunctionNameLength;
+            [FieldOffset(24)]
             public int ModuleNameOffset;
+            [FieldOffset(28)]
             public int ModuleNameLength;
+            [FieldOffset(32)]
             public JSBindingType Exception;
+            [FieldOffset(64)]
             public JSBindingType Result;
         }
 
-        [StructLayout(LayoutKind.Sequential, Pack = 4, Size = 32)]
+        // keep in sync with JSBindingTypeOffsets in marshal.ts
+        [StructLayout(LayoutKind.Explicit, Pack = 4, Size = 32)]
         internal struct JSBindingType
         {
+            [FieldOffset(0)]
             internal MarshalerType Type;
-            internal MarshalerType __ReservedB1;
-            internal MarshalerType __ReservedB2;
-            internal MarshalerType __ReservedB3;
-            internal IntPtr __Reserved;
-            internal IntPtr JSCustomMarshallerCode;
-            internal int JSCustomMarshallerCodeLength;
+            [FieldOffset(16)]
             internal MarshalerType ResultMarshalerType;
-            internal MarshalerType __ReservedB4;
-            internal MarshalerType __ReservedB5;
-            internal MarshalerType __ReservedB6;
+            [FieldOffset(20)]
             internal MarshalerType Arg1MarshalerType;
-            internal MarshalerType __ReservedB7;
-            internal MarshalerType __ReservedB8;
-            internal MarshalerType __ReservedB9;
+            [FieldOffset(24)]
             internal MarshalerType Arg2MarshalerType;
-            internal MarshalerType __ReservedB10;
-            internal MarshalerType __ReservedB11;
-            internal MarshalerType __ReservedB12;
+            [FieldOffset(28)]
             internal MarshalerType Arg3MarshalerType;
-            internal MarshalerType __ReservedB13;
-            internal MarshalerType __ReservedB14;
-            internal MarshalerType __ReservedB15;
         }
 
         internal unsafe int ArgumentCount
@@ -286,9 +283,9 @@ internal static unsafe void InvokeJSImportImpl(JSFunctionBinding signature, Span
                 arguments[1].slot.GCHandle = holder.GCHandle;
             }
 
-            if (signature.IsOneWay)
+            if (signature.IsDiscardNoWait)
             {
-                arguments[1].slot.Type = MarshalerType.OneWay;
+                arguments[1].slot.Type = MarshalerType.DiscardNoWait;
             }
 
 #if FEATURE_WASM_MANAGED_THREADS
@@ -305,7 +302,7 @@ internal static unsafe void InvokeJSImportImpl(JSFunctionBinding signature, Span
 #endif
 
             }
-            else if (signature.IsAsync || signature.IsOneWay)
+            else if (signature.IsAsync || signature.IsDiscardNoWait)
             {
                 //async
                 DispatchJSImportAsyncPost(signature, targetContext, arguments);

src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSHostImplementation.cs

@@ -153,7 +153,7 @@ public static unsafe JSFunctionBinding GetMethodSignature(ReadOnlySpan<JSMarshal
                 var type = signature.Sigs[i] = types[i + 1]._signatureType;
             }
             signature.IsAsync = types[0]._signatureType.Type == MarshalerType.Task;
-            signature.IsOneWay = types[0]._signatureType.Type == MarshalerType.OneWay;
+            signature.IsDiscardNoWait = types[0]._signatureType.Type == MarshalerType.DiscardNoWait;
 
             signature.Header[0].ImportHandle = signature.ImportHandle;
             signature.Header[0].FunctionNameLength = functionNameBytes;

src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSMarshalerArgument.cs

@@ -20,6 +20,7 @@ public partial struct JSMarshalerArgument
     {
         internal JSMarshalerArgumentImpl slot;
 
+        // keep in sync with JSMarshalerArgumentOffsets in marshal.ts
         [StructLayout(LayoutKind.Explicit, Pack = 32, Size = 32)]
         internal struct JSMarshalerArgumentImpl
         {

src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSMarshalerType.cs

@@ -48,9 +48,9 @@ private JSMarshalerType(JSFunctionBinding.JSBindingType signatureType)
         /// Dispatches the call asynchronously and doesn't wait for result.
         /// </summary>
         /// <returns>The marshaler metadata.</returns>
-        public static JSMarshalerType OneWay { get; } = new JSMarshalerType(new JSFunctionBinding.JSBindingType
+        public static JSMarshalerType DiscardNoWait { get; } = new JSMarshalerType(new JSFunctionBinding.JSBindingType
         {
-            Type = MarshalerType.OneWay
+            Type = MarshalerType.DiscardNoWait
         });
 
         /// <summary>

src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSType.cs

@@ -32,9 +32,9 @@ internal Discard() { }
         /// Could return immediately without waiting for the execution to finish, when dispatching the call to another thread.
         /// Suppresses marshaling of the JavaScript function's return value.
         /// </summary>
-        public sealed class OneWay : JSType
+        public sealed class DiscardNoWait : JSType
         {
-            internal OneWay() { }
+            internal DiscardNoWait() { }
         }
 
         /// <summary>

src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/MarshalerType.cs

@@ -34,7 +34,7 @@ internal enum MarshalerType : byte
         Span,
         Action,
         Function,
-        OneWay,
+        DiscardNoWait,
 
 #if !JSIMPORTGENERATOR
         // only on runtime

src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Marshaling/JSMarshalerArgument.Func.cs

@@ -20,7 +20,7 @@ public void InvokeJS()
                 // and would also allow the JS function to be collected
 
 
-                Span<JSMarshalerArgument> arguments = stackalloc JSMarshalerArgument[4];
+                Span<JSMarshalerArgument> arguments = stackalloc JSMarshalerArgument[2];
                 ref JSMarshalerArgument args_exception = ref arguments[0];
                 ref JSMarshalerArgument args_return = ref arguments[1];
 #if FEATURE_WASM_MANAGED_THREADS
@@ -51,7 +51,7 @@ public ActionJS(JSObject holder, ArgumentToJSCallback<T> arg1Marshaler)
             public void InvokeJS(T arg1)
             {
 
-                Span<JSMarshalerArgument> arguments = stackalloc JSMarshalerArgument[4];
+                Span<JSMarshalerArgument> arguments = stackalloc JSMarshalerArgument[3];
                 ref JSMarshalerArgument args_exception = ref arguments[0];
                 ref JSMarshalerArgument args_return = ref arguments[1];
                 ref JSMarshalerArgument args_arg1 = ref arguments[2];
@@ -258,7 +258,7 @@ public TResult InvokeJS()
                 // JSObject (held by this lambda) would be collected by GC after the lambda is collected
                 // and would also allow the JS function to be collected
 
-                Span<JSMarshalerArgument> arguments = stackalloc JSMarshalerArgument[4];
+                Span<JSMarshalerArgument> arguments = stackalloc JSMarshalerArgument[2];
                 ref JSMarshalerArgument args_exception = ref arguments[0];
                 ref JSMarshalerArgument args_return = ref arguments[1];
 #if FEATURE_WASM_MANAGED_THREADS
@@ -295,7 +295,7 @@ public FuncJS(JSObject holder, ArgumentToJSCallback<T> arg1Marshaler, ArgumentTo
             public TResult InvokeJS(T arg1)
             {
 
-                Span<JSMarshalerArgument> arguments = stackalloc JSMarshalerArgument[4];
+                Span<JSMarshalerArgument> arguments = stackalloc JSMarshalerArgument[3];
                 ref JSMarshalerArgument args_exception = ref arguments[0];
                 ref JSMarshalerArgument args_return = ref arguments[1];
                 ref JSMarshalerArgument args_arg1 = ref arguments[2];

src/libraries/System.Runtime.InteropServices.JavaScript/tests/System.Runtime.InteropServices.JavaScript.UnitTests/System/Runtime/InteropServices/JavaScript/JSExportTest.cs

@@ -26,12 +26,11 @@ await JsExportTestAsync(value,
 
         [Theory]
         [MemberData(nameof(MarshalInt32Cases))]
-        public async Task JsExportInt32OneWay(int value)
+        public async Task JsExportInt32DiscardNoWait(int value)
         {
             JavaScriptTestHelper.optimizedReached=0;
-
             JavaScriptTestHelper.invoke1O(value);
-            await Task.Yield();
+            await JavaScriptTestHelper.Delay(0);
             Assert.Equal(value, JavaScriptTestHelper.optimizedReached);
         }
 

src/libraries/System.Runtime.InteropServices.JavaScript/tests/System.Runtime.InteropServices.JavaScript.UnitTests/System/Runtime/InteropServices/JavaScript/JSImportTest.cs

@@ -529,10 +529,10 @@ public void JsImportInt16(short value)
         #region Int32
         [Theory]
         [MemberData(nameof(MarshalInt32Cases))]
-        public async Task JsImportInt32OneWay(int value)
+        public async Task JsImportInt32DiscardNoWait(int value)
         {
-            JavaScriptTestHelper.store1OneWay_Int32(value);
-            await Task.Yield();
+            JavaScriptTestHelper.store1DiscardNoWait_Int32(value);
+            await JavaScriptTestHelper.Delay(0);
             Assert.Equal(value, JavaScriptTestHelper.retrieve1_Int32());
         }
 

src/libraries/System.Runtime.InteropServices.JavaScript/tests/System.Runtime.InteropServices.JavaScript.UnitTests/System/Runtime/InteropServices/JavaScript/JavaScriptTestHelper.cs

@@ -15,7 +15,7 @@ namespace System.Runtime.InteropServices.JavaScript.Tests
     public partial class JavaScriptTestHelper
     {
         [JSImport("globalThis.console.log")]
-        [return: JSMarshalAs<JSType.OneWay>]
+        [return: JSMarshalAs<JSType.DiscardNoWait>]
         public static partial void Log([JSMarshalAs<JSType.String>] string message);
 
         [JSImport("globalThis.window.location.toString")]
@@ -28,12 +28,15 @@ public partial class JavaScriptTestHelper
         public static partial string ReboundMemberEcho(string message);
 
         [JSExport]
-        [return: JSMarshalAs<JSType.OneWay>]
+        [return: JSMarshalAs<JSType.DiscardNoWait>] // this means that the message will arrive out of order, especially across threads.
         public static void ConsoleWriteLine([JSMarshalAs<JSType.String>] string message)
         {
             Console.WriteLine(message);
         }
 
+        [JSImport("delay", "JavaScriptTestHelper")]
+        public static partial Task Delay(int ms);
+
         [JSImport("catch1toString", "JavaScriptTestHelper")]
         public static partial string catch1toString(string message, string functionName);
 
@@ -76,7 +79,7 @@ public static void Optimized1V(int a1)
         public static partial void invoke1V(int a1);
 
         [JSExport]
-        [return: JSMarshalAs<JSType.OneWay>]
+        [return: JSMarshalAs<JSType.DiscardNoWait>] // this means that the message will arrive out of order, especially across threads.
         public static void Optimized1O(int a1)
         {
             optimizedReached += a1;
@@ -274,8 +277,8 @@ internal static partial void Relaxed(string a1, Exception ex,
         internal static partial void store1_Int32([JSMarshalAs<JSType.Number>] int value);
 
         [JSImport("store1", "JavaScriptTestHelper")]
-        [return: JSMarshalAs<JSType.OneWay>]
-        internal static partial void store1OneWay_Int32([JSMarshalAs<JSType.Number>] int value);
+        [return: JSMarshalAs<JSType.DiscardNoWait>] // this means that the message will arrive out of order, especially across threads.
+        internal static partial void store1DiscardNoWait_Int32([JSMarshalAs<JSType.Number>] int value);
 
         [JSImport("retrieve1", "JavaScriptTestHelper")]
         [return: JSMarshalAs<JSType.Number>]

src/mono/browser/runtime/driver.c

@@ -263,7 +263,8 @@ mono_wasm_invoke_jsexport_async_post_cb (MonoMethod *method, void* args)
 {
 	mono_wasm_invoke_jsexport (method, args);
 	// TODO assert receiver_should_free ?
-	free (args);
+	if (args)
+		free (args);
 }
 
 // async

src/mono/browser/runtime/invoke-cs.ts

@@ -39,15 +39,15 @@ export function mono_wasm_bind_cs_function(method: MonoMethod, assemblyName: str
     const res_sig = get_sig(signature, 1);
     let res_marshaler_type = get_signature_type(res_sig);
 
-    // hack until we have public API for JSType.OneWay
+    // hack until we have public API for JSType.DiscardNoWait
     if (WasmEnableThreads && shortClassName === "DefaultWebAssemblyJSRuntime"
         && namespaceName === "Microsoft.AspNetCore.Components.WebAssembly.Services"
         && (methodName === "BeginInvokeDotNet" || methodName === "EndInvokeJS")) {
-        res_marshaler_type = MarshalerType.OneWay;
+        res_marshaler_type = MarshalerType.DiscardNoWait;
     }
 
     const is_async = res_marshaler_type == MarshalerType.Task;
-    const is_oneway = res_marshaler_type == MarshalerType.OneWay;
+    const is_discard_no_wait = res_marshaler_type == MarshalerType.DiscardNoWait;
     if (is_async) {
         res_marshaler_type = MarshalerType.TaskPreCreated;
     }
@@ -60,7 +60,7 @@ export function mono_wasm_bind_cs_function(method: MonoMethod, assemblyName: str
         arg_marshalers,
         res_converter,
         is_async,
-        is_oneway,
+        is_discard_no_wait,
         isDisposed: false,
     };
     let bound_fn: Function;
@@ -75,7 +75,7 @@ export function mono_wasm_bind_cs_function(method: MonoMethod, assemblyName: str
         else {
             bound_fn = bind_fn(closure);
         }
-    } else if (is_oneway) {
+    } else if (is_discard_no_wait) {
         bound_fn = bind_fn(closure);
     } else {
         if (args_count == 0 && !res_converter) {
@@ -285,7 +285,7 @@ function bind_fn(closure: BindingClosure) {
     const method = closure.method;
     const fqn = closure.fullyQualifiedName;
     const is_async = closure.is_async;
-    const is_oneway = closure.is_oneway;
+    const is_discard_no_wait = closure.is_discard_no_wait;
     if (!WasmEnableThreads) (<any>closure) = null;
     return function bound_fn(...js_args: any[]) {
         const mark = startMeasure();
@@ -313,7 +313,7 @@ function bind_fn(closure: BindingClosure) {
                 // in case the C# side returned synchronously
                 js_result = end_marshal_task_to_js(args, undefined, js_result);
             }
-            else if (is_oneway) {
+            else if (is_discard_no_wait) {
                 // call C# side, fire and forget
                 invoke_async_jsexport(method, args, 2 + args_count);
             }
@@ -338,7 +338,7 @@ type BindingClosure = {
     arg_marshalers: (BoundMarshalerToCs)[],
     res_converter: BoundMarshalerToJs | undefined,
     is_async: boolean,
-    is_oneway: boolean,
+    is_discard_no_wait: boolean,
     isDisposed: boolean,
 }