[browser][coreCLR] async main, thread pool, timers

docs/workflow/building/coreclr/wasm.md

@@ -128,6 +128,9 @@ In config below please replace `/path/to/runtime/` by a **absolute unix path** t
                 "env": {
                     "CORE_ROOT":"/path/to/runtime/artifacts/bin/coreclr/browser.wasm.Debug/IL/"
                 },
+                "runtimeArgs": [
+                    "--stack-trace-limit=1000"
+                ],
                 "args": [
                     "/path/to/runtime/artifacts/bin/coreclr/browser.wasm.Debug/IL/helloworld.dll"
                 ],
@@ -140,6 +143,9 @@ In config below please replace `/path/to/runtime/` by a **absolute unix path** t
                 "skipFiles": [
                     "<node_internals>/**"
                 ],
+                "runtimeArgs": [
+                    "--stack-trace-limit=1000"
+                ],
                 "args": [
                     "HelloWorld.dll"
                 ],

src/coreclr/System.Private.CoreLib/System.Private.CoreLib.csproj

@@ -205,6 +205,7 @@
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\GenericsHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\InitHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\AsyncHelpers.CoreCLR.cs" />
+    <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\AsyncHelpers.Browser.cs" Condition="'$(TargetsBrowser)' == 'true'" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\RuntimeHelpers.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\StaticsHelpers.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Runtime\CompilerServices\VirtualDispatchHelpers.cs" />

src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncHelpers.Browser.cs

@@ -0,0 +1,57 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+
+namespace System.Runtime.CompilerServices
+{
+    public static partial class AsyncHelpers
+    {
+        [DynamicDependency(nameof(MainWrapper))]
+        [DynamicDependency(nameof(MainWrapperVoid))]
+        static AsyncHelpers()
+        {
+        }
+
+        private static void MainWrapper(object exitCodeTask)
+        {
+            var task = (Task<int>)exitCodeTask;
+            task.ContinueWith(t =>
+            {
+                if (t.IsFaulted)
+                {
+                    SystemJS_RejectMainPromise(t.Exception.Message);
+                }
+                else
+                {
+                    SystemJS_ResolveMainPromise(t.Result);
+                }
+            }, TaskScheduler.Default);
+        }
+
+        private static void MainWrapperVoid(object exitCodeTask)
+        {
+            var task = (Task)exitCodeTask;
+            task.ContinueWith(t =>
+            {
+                if (t.IsFaulted)
+                {
+                    SystemJS_RejectMainPromise(t.Exception.Message);
+                }
+                else
+                {
+                    SystemJS_ResolveMainPromise(0);
+                }
+            }, TaskScheduler.Default);
+        }
+
+        [LibraryImport(RuntimeHelpers.QCall)]
+        private static unsafe partial void SystemJS_RejectMainPromise([MarshalAs(UnmanagedType.LPWStr)] string pMessage);
+
+        [LibraryImport(RuntimeHelpers.QCall)]
+        private static partial void SystemJS_ResolveMainPromise(int exitCode);
+    }
+}

src/coreclr/hosts/corerun/CMakeLists.txt

@@ -74,11 +74,12 @@ else()
                 RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
             target_link_options(corerun PRIVATE
                 -fwasm-exceptions
-                -sEXIT_RUNTIME=1
+                -sEXIT_RUNTIME=0
                 -sINITIAL_MEMORY=134217728
                 -sMAXIMUM_MEMORY=2147483648
                 -sALLOW_MEMORY_GROWTH=1
                 -sSTACK_SIZE=5MB
+                -sEXPORTED_RUNTIME_METHODS=UTF8ToString,cwrap,ccall,HEAPU8,HEAPU32,HEAPU64,safeSetTimeout,maybeExit
                 -sEXPORTED_FUNCTIONS=_main,_GetDotNetRuntimeContractDescriptor
                 -sENVIRONMENT=node,shell,web
                 -Wl,-error-limit=0)

src/coreclr/hosts/corerun/corerun.cpp

@@ -539,6 +539,7 @@ static int run(const configuration& config)
         actions.after_execute_assembly();
     }
 
+#if !defined(TARGET_BROWSER)
     int latched_exit_code = 0;
     result = coreclr_shutdown2_func(CurrentClrInstance, CurrentAppDomainId, &latched_exit_code);
     if (FAILED(result))
@@ -553,6 +554,10 @@ static int run(const configuration& config)
     ::free((void*)s_core_libs_path);
     ::free((void*)s_core_root_path);
     return exit_code;
+#else // TARGET_BROWSER
+    // In browser we don't shutdown the runtime here as we want to keep it alive
+    return 0;
+#endif // TARGET_BROWSER
 }
 
 // Display the command line options

src/coreclr/vm/CMakeLists.txt

@@ -921,6 +921,9 @@ elseif(CLR_CMAKE_TARGET_ARCH_RISCV64)
         gcinfodecoder.cpp
     )
 elseif(CLR_CMAKE_TARGET_ARCH_WASM)
+    set(VM_HEADERS_WKS_ARCH_ASM
+        ${ARCH_SOURCES_DIR}/entrypoints.h
+    )
     set(VM_SOURCES_WKS_ARCH
         ${ARCH_SOURCES_DIR}/calldescrworkerwasm.cpp
         ${ARCH_SOURCES_DIR}/profiler.cpp