[browser][MT] fix feature detection on webworker (dotnet#107452)

src/mono/browser/runtime/jiterpreter-jit-call.ts

@@ -61,7 +61,6 @@ const maxJitQueueLength = 6,
 
 let trampBuilder: WasmBuilder;
 let fnTable: WebAssembly.Table;
-let wasmEhSupported: boolean | undefined = undefined;
 let nextDisambiguateIndex = 0;
 const fnCache: Array<Function | undefined> = [];
 const targetCache: { [target: number]: TrampolineInfo } = {};
@@ -276,18 +275,6 @@ export function mono_interp_jit_wasm_jit_call_trampoline (
         mono_interp_flush_jitcall_queue();
 }
 
-function getIsWasmEhSupported (): boolean {
-    if (wasmEhSupported !== undefined)
-        return wasmEhSupported;
-
-    // Probe whether the current environment can handle wasm exceptions
-    wasmEhSupported = runtimeHelpers.featureWasmEh === true;
-    if (!wasmEhSupported)
-        mono_log_info("Disabling Jiterpreter Exception Handling");
-
-    return wasmEhSupported;
-}
-
 export function mono_interp_flush_jitcall_queue (): void {
     const jitQueue: TrampolineInfo[] = [];
     let methodPtr = <MonoMethod><any>0;
@@ -336,7 +323,7 @@ export function mono_interp_flush_jitcall_queue (): void {
     }
 
     if (builder.options.enableWasmEh) {
-        if (!getIsWasmEhSupported()) {
+        if (!runtimeHelpers.featureWasmEh) {
             // The user requested to enable wasm EH but it's not supported, so turn the option back off
             applyOptions(<any>{ enableWasmEh: false });
             builder.options.enableWasmEh = false;

src/mono/browser/runtime/jiterpreter-trace-generator.ts

@@ -3526,19 +3526,6 @@ function emit_arrayop (builder: WasmBuilder, frame: NativePointer, ip: MintOpcod
     return true;
 }
 
-let wasmSimdSupported: boolean | undefined;
-
-function getIsWasmSimdSupported (): boolean {
-    if (wasmSimdSupported !== undefined)
-        return wasmSimdSupported;
-
-    wasmSimdSupported = runtimeHelpers.featureWasmSimd === true;
-    if (!wasmSimdSupported)
-        mono_log_info("Disabling Jiterpreter SIMD");
-
-    return wasmSimdSupported;
-}
-
 function get_import_name (
     builder: WasmBuilder, typeName: string,
     functionPtr: number
@@ -3557,7 +3544,7 @@ function emit_simd (
 ): boolean {
     // First, if compiling an intrinsic attempt to emit the special vectorized implementation
     // We only do this if SIMD is enabled since we'll be using the v128 opcodes.
-    if (builder.options.enableSimd && getIsWasmSimdSupported()) {
+    if (builder.options.enableSimd && runtimeHelpers.featureWasmSimd) {
         switch (argCount) {
             case 2:
                 if (emit_simd_2(builder, ip, <SimdIntrinsic2>index))
@@ -3577,7 +3564,7 @@ function emit_simd (
     // Fall back to a mix of non-vectorized wasm and the interpreter's implementation of the opcodes
     switch (opcode) {
         case MintOpcode.MINT_SIMD_V128_LDC: {
-            if (builder.options.enableSimd && getIsWasmSimdSupported()) {
+            if (builder.options.enableSimd && runtimeHelpers.featureWasmSimd) {
                 builder.local("pLocals");
                 const view = localHeapViewU8().slice(<any>ip + 4, <any>ip + 4 + sizeOfV128);
                 builder.v128_const(view);

src/mono/browser/runtime/startup.ts

@@ -128,6 +128,9 @@ async function instantiateWasmWorker (
     successCallback: InstantiateWasmSuccessCallback
 ): Promise<void> {
     if (!WasmEnableThreads) return;
+
+    await ensureUsedWasmFeatures();
+
     // wait for the config to arrive by message from the main thread
     await loaderHelpers.afterConfigLoaded.promise;