[browser] host improvements

src/coreclr/hosts/corerun/corerun.cpp

@@ -365,20 +365,6 @@ static bool HOST_CONTRACT_CALLTYPE external_assembly_probe(
     return false;
 }
 
-#ifdef TARGET_BROWSER
-bool is_node()
-{
-    return EM_ASM_INT({
-        if (typeof process !== 'undefined' &&
-            process.versions &&
-            process.versions.node) {
-            return 1;
-        }
-        return 0;
-    });
-}
-#endif // TARGET_BROWSER
-
 static int run(const configuration& config)
 {
     platform_specific_actions actions;
@@ -620,12 +606,9 @@ static int run(const configuration& config)
     }
 
 #ifdef TARGET_BROWSER
-    if (!is_node())
-    {
-        // In browser we don't shutdown the runtime here as we want to keep it alive
-        return 0;
-    }
-#endif // TARGET_BROWSER
+    // In browser we don't shutdown the runtime here as we want to keep it alive
+    return 0;
+#else // TARGET_BROWSER
 
     int latched_exit_code = 0;
     result = coreclr_shutdown2_func(CurrentClrInstance, CurrentAppDomainId, &latched_exit_code);
@@ -641,6 +624,8 @@ static int run(const configuration& config)
     ::free((void*)s_core_libs_path);
     ::free((void*)s_core_root_path);
     return exit_code;
+
+#endif // TARGET_BROWSER
 }
 
 // Display the command line options

src/coreclr/hosts/corerun/wasm/libCorerun.extpost.js

@@ -8,6 +8,15 @@ var fetch = fetch || undefined; var dotnetNativeModuleLoaded = false; var dotnet
 export function selfRun() {
     const Module = {};
     const corePreRun = () => {
+
+        // drop windows drive letter for NODEFS cwd to pretend we are in unix
+        NODERAWFS.cwd = () => {
+            const path = process.cwd();
+            return NODEFS.isWindows
+                ? path.replace(/^[a-zA-Z]:/, "").replace(/\\/g, "/")
+                : path;
+        };
+
         // copy all node/shell env variables to emscripten env
         if (globalThis.process && globalThis.process.env) {
             for (const [key, value] of Object.entries(process.env)) {

src/coreclr/pal/src/arch/wasm/stubs.cpp

@@ -19,7 +19,15 @@ DBG_DebugBreak()
 #ifdef _DEBUG
     DBG_PrintInterpreterStack();
 #endif // _DEBUG
+    double start = emscripten_get_now();
     emscripten_debugger();
+    double end = emscripten_get_now();
+    // trying to guess if the debugger was attached
+    if(end - start < 100){
+        // If the debugger was not attached, abort the process
+        // to match other platforms and fail fast
+        emscripten_throw_string("Debugger not attached");
+    }
 }
 
 /* context */

src/coreclr/pal/src/debug/debug.cpp

@@ -65,6 +65,10 @@ SET_DEFAULT_DEBUG_CHANNEL(DEBUG); // some headers have code with asserts, so do
 #endif
 #endif // __APPLE__
 
+#ifdef __EMSCRIPTEN__
+#include <emscripten/heap.h>
+#endif // __EMSCRIPTEN__
+
 #if HAVE_MACH_EXCEPTIONS
 #include "../exception/machexception.h"
 #endif // HAVE_MACH_EXCEPTIONS
@@ -751,6 +755,13 @@ PAL_ProbeMemory(
     DWORD cbBuffer,
     BOOL fWriteAccess)
 {
+#if defined(__EMSCRIPTEN__)
+    if ((PBYTE)pBuffer + cbBuffer < (PVOID)emscripten_get_heap_size()) 
+    {
+        return TRUE;
+    }
+    return FALSE;
+#else // __EMSCRIPTEN__
     int fds[2];
     int flags;
 
@@ -807,6 +818,7 @@ PAL_ProbeMemory(
     close(fds[1]);
 
     return result;
+#endif // __EMSCRIPTEN__
 }
 
 } // extern "C"

src/coreclr/vm/precode_portable.cpp

@@ -32,7 +32,7 @@ void* PortableEntryPoint::GetActualCode(PCODE addr)
     STANDARD_VM_CONTRACT;
 
     PortableEntryPoint* portableEntryPoint = ToPortableEntryPoint(addr);
-    _ASSERTE(portableEntryPoint->HasNativeCode());
+    _ASSERTE_ALL_BUILDS(portableEntryPoint->HasNativeCode());
     return portableEntryPoint->_pActualCode;
 }
 
@@ -41,7 +41,7 @@ void PortableEntryPoint::SetActualCode(PCODE addr, PCODE actualCode)
     STANDARD_VM_CONTRACT;
 
     PortableEntryPoint* portableEntryPoint = ToPortableEntryPoint(addr);
-    _ASSERTE(actualCode != (PCODE)NULL);
+    _ASSERTE_ALL_BUILDS(actualCode != (PCODE)NULL);
 
     // This is a lock free write. It can either be NULL or was already set to the same value.
     _ASSERTE(!portableEntryPoint->HasNativeCode() || portableEntryPoint->_pActualCode == (void*)PCODEToPINSTR(actualCode));

src/libraries/Common/tests/TestUtilities/System/AssemblyPathHelper.cs

@@ -13,9 +13,11 @@ public static string GetAssemblyLocation(Assembly a)
             // Note, in Browser, assemblies are loaded from memory and in that case, Assembly.Location will return an empty
             // string.  For these tests, the assemblies will also be available in the VFS, so just specify the assembly name
             // plus extension.
+            const string browserVirtualAppBase = "/managed"; // keep in sync other places that define browserVirtualAppBase
+
             return (PlatformDetection.IsNotBrowser) ?
                 a.Location
-                : "/" + a.GetName().Name + ".dll";
+                : browserVirtualAppBase + "/" + a.GetName().Name + ".dll";
         }
     }
 }

src/mono/browser/runtime/assets.ts

@@ -5,7 +5,7 @@ import type { AssetEntryInternal } from "./types/internal";
 
 import cwraps from "./cwraps";
 import { wasm_load_icu_data } from "./icu";
-import { Module, loaderHelpers, mono_assert, runtimeHelpers } from "./globals";
+import { Module, browserVirtualAppBase, loaderHelpers, mono_assert, runtimeHelpers } from "./globals";
 import { mono_log_info, mono_log_debug, parseSymbolMapFile } from "./logging";
 import { mono_wasm_load_bytes_into_heap_persistent } from "./memory";
 import { endMeasure, MeasuredBlock, startMeasure } from "./profiler";
@@ -44,31 +44,18 @@ export function instantiate_asset (asset: AssetEntry, url: string, bytes: Uint8A
             const lastSlash = virtualName.lastIndexOf("/");
             let parentDirectory = (lastSlash > 0)
                 ? virtualName.substring(0, lastSlash)
-                : null;
+                : browserVirtualAppBase;
             let fileName = (lastSlash > 0)
                 ? virtualName.substring(lastSlash + 1)
                 : virtualName;
             if (fileName.startsWith("/"))
                 fileName = fileName.substring(1);
-            if (parentDirectory) {
-                if (!parentDirectory.startsWith("/"))
-                    parentDirectory = "/" + parentDirectory;
-
-                mono_log_debug(`Creating directory '${parentDirectory}'`);
-
-                Module.FS_createPath(
-                    "/", parentDirectory, true, true // fixme: should canWrite be false?
-                );
-            } else {
-                parentDirectory = "/";
-            }
+            if (!parentDirectory.startsWith("/"))
+                parentDirectory = browserVirtualAppBase + "/" + parentDirectory;
 
             mono_log_debug(() => `Creating file '${fileName}' in directory '${parentDirectory}'`);
-
-            Module.FS_createDataFile(
-                parentDirectory, fileName,
-                bytes, true /* canRead */, true /* canWrite */, true /* canOwn */
-            );
+            Module.FS_createPath("/", parentDirectory, true, true);
+            Module.FS_createDataFile(parentDirectory, fileName, bytes, true /* canRead */, true /* canWrite */, true /* canOwn */);
             break;
         }
         default:

src/mono/browser/runtime/globals.ts

@@ -23,6 +23,7 @@ export const ENVIRONMENT_IS_SIDECAR = ENVIRONMENT_IS_WEB_WORKER && typeof dotnet
 export const ENVIRONMENT_IS_WORKER = ENVIRONMENT_IS_WEB_WORKER && !ENVIRONMENT_IS_SIDECAR; // we redefine what ENVIRONMENT_IS_WORKER, we replace it in emscripten internals, so that sidecar works
 export const ENVIRONMENT_IS_WEB = typeof window == "object" || (ENVIRONMENT_IS_WEB_WORKER && !ENVIRONMENT_IS_NODE);
 export const ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE;
+export const browserVirtualAppBase = "/managed"; // keep in sync other places that define browserVirtualAppBase
 
 // these are imported and re-exported from emscripten internals
 export let ENVIRONMENT_IS_PTHREAD: boolean;

src/mono/browser/runtime/loader/config.ts

@@ -12,6 +12,7 @@ import { importLibraryInitializers, invokeLibraryInitializers } from "./libraryI
 import { mono_exit } from "./exit";
 import { makeURLAbsoluteWithApplicationBase } from "./polyfills";
 import { appendUniqueQuery } from "./assets";
+import { browserVirtualAppBase } from "./globals";
 
 export function deep_merge_config (target: MonoConfigInternal, source: MonoConfigInternal): MonoConfigInternal {
     // no need to merge the same object
@@ -190,6 +191,10 @@ export function normalizeConfig () {
         config.debugLevel = -1;
     }
 
+    if (config.virtualWorkingDirectory === undefined) {
+        config.virtualWorkingDirectory = browserVirtualAppBase;
+    }
+
     if (!config.applicationEnvironment) {
         config.applicationEnvironment = "Production";
     }

src/mono/browser/runtime/loader/globals.ts

@@ -31,6 +31,7 @@ export const ENVIRONMENT_IS_SIDECAR = ENVIRONMENT_IS_WEB_WORKER && typeof dotnet
 export const ENVIRONMENT_IS_WORKER = ENVIRONMENT_IS_WEB_WORKER && !ENVIRONMENT_IS_SIDECAR; // we redefine what ENVIRONMENT_IS_WORKER, we replace it in emscripten internals, so that sidecar works
 export const ENVIRONMENT_IS_WEB = typeof window == "object" || (ENVIRONMENT_IS_WEB_WORKER && !ENVIRONMENT_IS_NODE);
 export const ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE;
+export const browserVirtualAppBase = "/managed"; // keep in sync other places that define browserVirtualAppBase
 
 export let runtimeHelpers: RuntimeHelpers = {} as any;
 export let loaderHelpers: LoaderHelpers = {} as any;

src/mono/browser/runtime/startup.ts

@@ -5,7 +5,7 @@ import WasmEnableThreads from "consts:wasmEnableThreads";
 import BuildConfiguration from "consts:configuration";
 
 import { DotnetModuleInternal, CharPtrNull, MainToWorkerMessageType } from "./types/internal";
-import { exportedRuntimeAPI, INTERNAL, loaderHelpers, Module, runtimeHelpers, createPromiseController, mono_assert } from "./globals";
+import { exportedRuntimeAPI, INTERNAL, loaderHelpers, Module, runtimeHelpers, createPromiseController, mono_assert, browserVirtualAppBase } from "./globals";
 import cwraps, { init_c_exports, threads_c_functions as tcwraps } from "./cwraps";
 import { mono_wasm_raise_debug_event, mono_wasm_runtime_ready } from "./debug";
 import { toBase64StringImpl } from "./base64";
@@ -218,18 +218,9 @@ async function onRuntimeInitializedAsync (userOnRuntimeInitialized: (module:Emsc
 
         if (runtimeHelpers.config.virtualWorkingDirectory) {
             const FS = Module.FS;
-            const cwd = runtimeHelpers.config.virtualWorkingDirectory;
-            try {
-                const wds = FS.stat(cwd);
-                if (!wds) {
-                    Module.FS_createPath("/", cwd, true, true);
-                } else {
-                    mono_assert(wds && FS.isDir(wds.mode), () => `FS.chdir: ${cwd} is not a directory`);
-                }
-            } catch (e) {
-                Module.FS_createPath("/", cwd, true, true);
-            }
-            FS.chdir(cwd);
+            FS.createPath("/", browserVirtualAppBase, true, true);
+            FS.createPath("/", runtimeHelpers.config.virtualWorkingDirectory, true, true);
+            FS.chdir(runtimeHelpers.config.virtualWorkingDirectory);
         }
 
         if (runtimeHelpers.config.interpreterPgo)

src/mono/browser/test-main.js

@@ -24,6 +24,7 @@ export const ENVIRONMENT_IS_SIDECAR = ENVIRONMENT_IS_WEB_WORKER && typeof dotnet
 export const ENVIRONMENT_IS_WORKER = ENVIRONMENT_IS_WEB_WORKER && !ENVIRONMENT_IS_SIDECAR; // we redefine what ENVIRONMENT_IS_WORKER, we replace it in emscripten internals, so that sidecar works
 export const ENVIRONMENT_IS_WEB = typeof window == "object" || (ENVIRONMENT_IS_WEB_WORKER && !ENVIRONMENT_IS_NODE);
 export const ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE;
+export const browserVirtualAppBase = "/managed"; // keep in sync other places that define browserVirtualAppBase
 export const isFirefox = !!(ENVIRONMENT_IS_WEB && navigator.userAgent.includes("Firefox"));
 export const isChromium = !!(ENVIRONMENT_IS_WEB && navigator.userAgentData && navigator.userAgentData.brands.some(b => b.brand === "Google Chrome" || b.brand === "Microsoft Edge" || b.brand === "Chromium"));
 
@@ -111,7 +112,7 @@ function initRunArgs(runArgs) {
     // set defaults
     runArgs.applicationArguments = runArgs.applicationArguments === undefined ? [] : runArgs.applicationArguments;
     runArgs.profilers = runArgs.profilers === undefined ? [] : runArgs.profilers;
-    runArgs.workingDirectory = runArgs.workingDirectory === undefined ? '/' : runArgs.workingDirectory;
+    runArgs.workingDirectory = runArgs.workingDirectory === undefined ? browserVirtualAppBase : runArgs.workingDirectory;
     runArgs.environmentVariables = runArgs.environmentVariables === undefined ? {} : runArgs.environmentVariables;
     runArgs.runtimeArgs = runArgs.runtimeArgs === undefined ? [] : runArgs.runtimeArgs;
     runArgs.enableGC = runArgs.enableGC === undefined ? true : runArgs.enableGC;

src/mono/nuget/Microsoft.NET.Sdk.WebAssembly.Pack/build/Microsoft.NET.Sdk.WebAssembly.Browser.targets

@@ -241,7 +241,7 @@ Copyright (c) .NET Foundation. All rights reserved.
   <Target Name="ComputeWasmVfs">
     <ItemGroup>
       <WasmFilesToIncludeInFileSystem Condition="'%(WasmFilesToIncludeInFileSystem.TargetPath)' == ''">
-        <TargetPath>/%(WasmFilesToIncludeInFileSystem.Identity)</TargetPath>
+        <TargetPath>%(WasmFilesToIncludeInFileSystem.Identity)</TargetPath>
       </WasmFilesToIncludeInFileSystem>
     </ItemGroup>
 

src/mono/sample/mbr/browser/WasmDelta.csproj

@@ -31,7 +31,7 @@
   <Target Name="PrepareDeltasForWasmApp" DependsOnTargets="Build;CompileDiff;ComputeDeltaFileOutputNames">
     <ItemGroup>
       <WasmFilesToIncludeInFileSystem Include="@(_DeltaFileForPublish)">
-        <TargetPath>\%(_DeltaFileForPublish.Filename)%(_DeltaFileForPublish.Extension)</TargetPath>
+        <TargetPath>%(_DeltaFileForPublish.Filename)%(_DeltaFileForPublish.Extension)</TargetPath>
       </WasmFilesToIncludeInFileSystem>
     </ItemGroup>
   </Target>

src/mono/sample/wasm/Directory.Build.targets

@@ -94,7 +94,7 @@
   </Target>
 
   <Target Name="RunSampleWithV8" DependsOnTargets="BuildSampleInTree;_ComputeMainJSFileName">
-    <Exec WorkingDirectory="bin/publish/wwwroot" Command="v8 $(_WasmMainJSFileName) $(Args)" IgnoreExitCode="true" />
+    <Exec WorkingDirectory="bin/publish/wwwroot" Command="v8 --module $(_WasmMainJSFileName) $(Args)" IgnoreExitCode="true" />
   </Target>
   <Target Name="RunSampleWithNode" DependsOnTargets="BuildSampleInTree;_ComputeMainJSFileName">
     <Exec WorkingDirectory="bin/publish/wwwroot" Command="node $(_WasmMainJSFileName) $(Args)" IgnoreExitCode="true" />

src/mono/wasm/Wasm.Build.Tests/Common/BuildEnvironment.cs

@@ -111,7 +111,7 @@ public BuildEnvironment()
                             $" {nameof(IsRunningOnCI)} is true but {nameof(IsWorkloadWithMultiThreadingForDefaultFramework)} is false.");
             }
 
-            UseWebcil = EnvironmentVariables.UseWebcil && EnvironmentVariables.RuntimeFlavor != "CoreCLR"; // TODO-WASM: CoreCLR support for Webcil
+            UseWebcil = EnvironmentVariables.UseWebcil && EnvironmentVariables.RuntimeFlavor != "CoreCLR"; // TODO-WASM: CoreCLR support for Webcil https://github.com/dotnet/runtime/issues/120248
 
             if (EnvironmentVariables.BuiltNuGetsPath is null || !Directory.Exists(EnvironmentVariables.BuiltNuGetsPath))
                 throw new Exception($"Cannot find 'BUILT_NUGETS_PATH={EnvironmentVariables.BuiltNuGetsPath}'");

src/mono/wasm/Wasm.Build.Tests/FilesToIncludeInFileSystemTests.cs

@@ -51,6 +51,6 @@ public async Task LoadFilesToVfs(bool publish)
 
         Assert.Contains(result.TestOutput, m => m.Contains("'/myfiles/Vfs1.txt' exists 'True' with content 'Vfs1.txt'"));
         Assert.Contains(result.TestOutput, m => m.Contains("'/myfiles/Vfs2.txt' exists 'True' with content 'Vfs2.txt'"));
-        Assert.Contains(result.TestOutput, m => m.Contains("'/subdir/subsubdir/Vfs3.txt' exists 'True' with content 'Vfs3.txt'"));
+        Assert.Contains(result.TestOutput, m => m.Contains("'subdir/subsubdir/Vfs3.txt' exists 'True' with content 'Vfs3.txt'"));
     }
 }

src/mono/wasm/testassets/WasmBasicTestApp/App/FilesToIncludeInFileSystemTest.cs

@@ -14,7 +14,7 @@ public static void Run()
         // Check file presence in VFS based on application environment
         PrintFileExistence("/myfiles/Vfs1.txt");
         PrintFileExistence("/myfiles/Vfs2.txt");
-        PrintFileExistence("/subdir/subsubdir/Vfs3.txt");
+        PrintFileExistence("subdir/subsubdir/Vfs3.txt");
     }
 
     // Synchronize with FilesToIncludeInFileSystemTests

src/native/corehost/browserhost/CMakeLists.txt

@@ -116,11 +116,11 @@ target_link_options(browserhost PRIVATE
     -sMODULARIZE=1
     -sEXPORT_ES6=1
     -sEXIT_RUNTIME=1
+    -sALLOW_TABLE_GROWTH=1
     -sEXPORTED_RUNTIME_METHODS=BROWSER_HOST,${CMAKE_EMCC_EXPORTED_RUNTIME_METHODS}
     -sEXPORTED_FUNCTIONS=${CMAKE_EMCC_EXPORTED_FUNCTIONS}
     -sEXPORT_NAME=createDotnetRuntime
     -sENVIRONMENT=web,webview,worker,node,shell
-    -lnodefs.js
     -Wl,-error-limit=0)
 
 target_link_libraries(browserhost PRIVATE