Move the loading code to shared prerunCode helpers

There's now three helpers `getBinary`/`getString`/`dynamicImport` that help fetch resources from blobs/paths in the various `benchmark.js`'s `init` functions.

All of the preloads in JetStream have been switched to using one of those, thus an AsyncBenchmark with the exception of WasmLegacyBenchmark (aka tfjs-wasm).

Lastly, there's also no more special casing for the wasmBinary preload, instead it's set in each relevant `benchmark.js`'s `init` function.

Author: kmiller68

8bitbench/benchmark.js

@@ -38,12 +38,8 @@ class Benchmark {
   romBinary;
 
   async init() {
-    if (isInBrowser) {
-      let response = await fetch(romBinary);
-      this.romBinary = new Int8Array(await response.arrayBuffer());
-    } else {
-      this.romBinary = new Int8Array(read(romBinary, "binary"));
-    }
+    Module.wasmBinary = await getBinary(wasmBinary);
+    this.romBinary = await getBinary(romBinary);
   }
 
   async runIteration() {

ARES-6/Babylon/benchmark.js

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2017 Apple Inc. All rights reserved.
+ * Copyright (C) 2017-2025 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,8 +26,7 @@
 "use strict";
 
 class Benchmark {
-    constructor(verbose = 0)
-    {
+    async init(verbose = 0) {
         let sources = [];
 
         const files = [
@@ -37,23 +36,8 @@ class Benchmark {
             , [babylonBlob, {sourceType: "module"}]
         ];
 
-        for (let [file, options] of files) {
-            function appendSource(s) {
-                sources.push([file, s, options]);
-            }
-
-            let s;
-            if (isInBrowser) {
-                let request = new XMLHttpRequest();
-                request.open('GET', file, false);
-                request.send(null);
-                if (!request.responseText.length)
-                    throw new Error("Expect non-empty sources");
-                appendSource(request.responseText);
-            } else {
-                appendSource(read(file));
-            }
-        }
+        for (let [file, options] of files)
+            sources.push([file, await getString(file), options]);
 
         this.sources = sources;
     }

Dart/benchmark.js

@@ -261,20 +261,9 @@ class Benchmark {
   async init() {
     // The generated JavaScript code from dart2wasm is an ES module, which we
     // can only load with a dynamic import (since this file is not a module.)
-    // TODO: Support ES6 modules in the driver instead of this one-off solution.
-    // This probably requires a new `Benchmark` field called `modules` that
-    // is a map from module variable name (which will hold the resulting module
-    // namespace object) to relative module URL, which is resolved in the
-    // `preRunnerCode`, similar to this code here.
 
-    try {
-      this.dart2wasmJsModule = await import(jsModule);
-    } catch {
-      // In shells, relative imports require different paths, so try with and
-      // without the "./" prefix (e.g., JSC requires it).
-      if (!isInBrowser)
-        this.dart2wasmJsModule = await import(jsModule.slice("./".length))
-    }
+    Module.wasmBinary = await getBinary(wasmBinary);
+    this.dart2wasmJsModule = await dynamicImport(jsModule);
   }
 
   async runIteration() {

JetStreamDriver.js

@@ -994,7 +994,6 @@ class Benchmark {
             return this._resourcesPromise;
 
         this.preloads = [];
-        this.blobs = [];
 
         if (isInBrowser) {
             this._resourcesPromise = Promise.resolve();
@@ -1137,6 +1136,51 @@ class DefaultBenchmark extends Benchmark {
 }
 
 class AsyncBenchmark extends DefaultBenchmark {
+    get prerunCode() {
+        let str = "";
+        // FIXME: It would be nice if these were available to any benchmark not just async ones but since these functions
+        // are async they would only work in a context where the benchmark is async anyway. Long term, we should do away
+        // with this class and make all benchmarks async.
+        if (isInBrowser) {
+            str += `
+                async function getBinary(blobURL) {
+                    const response = await fetch(blobURL);
+                    return new Int8Array(await response.arrayBuffer());
+                }
+
+                async function getString(blobURL) {
+                    const response = await fetch(blobURL);
+                    return response.text();
+                }
+
+                async function dynamicImport(blobURL) {
+                    return await import(blobURL);
+                }
+            `;
+        } else {
+            str += `
+                async function getBinary(path) {
+                    return new Int8Array(read(path, "binary"));
+                }
+
+                async function getString(path) {
+                    return read(path);
+                }
+
+                async function dynamicImport(path) {
+                    try {
+                        return await import(path);
+                    } catch (e) {
+                        // In shells, relative imports require different paths, so try with and
+                        // without the "./" prefix (e.g., JSC requires it).
+                        return await import(path.slice("./".length))
+                    }
+                }
+            `;
+        }
+        return str;
+    }
+
     get runnerCode() {
         return `
         async function doRun() {
@@ -1174,7 +1218,7 @@ class AsyncBenchmark extends DefaultBenchmark {
 // part of a larger project's build system or a wasm benchmark compiled from a language that doesn't compile with emcc.
 class WasmEMCCBenchmark extends AsyncBenchmark {
     get prerunCode() {
-        return `
+        let str = `
             let verbose = false;
 
             let globalObject = this;
@@ -1204,43 +1248,20 @@ class WasmEMCCBenchmark extends AsyncBenchmark {
                     Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
                 },
             };
+
             globalObject.Module = Module;
+            ${super.prerunCode};
         `;
-    }
 
-    // This is in runnerCode rather than prerunCode because prerunCode isn't currently structured to be async by default.
-    get runnerCode() {
-        let str = `(async function doRunWrapper() {`
-        if (isInBrowser) {
-            str += `
-                async function getBinary(key, blobURL) {
-                    const response = await fetch(blobURL);
-                    Module[key] = new Int8Array(await response.arrayBuffer());
-                }
-            `;
-        } else
+        if (isSpiderMonkey) {
             str += `
                 // Needed because SpiderMonkey shell doesn't have a setTimeout.
                 Module.setStatus = null;
                 Module.monitorRunDependencies = null;
-                function getBinary(key, path) {
-                    Module[key] = new Int8Array(read(path, "binary"));
-                }
             `;
-
-        for (let [ preloadKey, blobURLOrPath ] of this.preloads) {
-            if (preloadKey == "wasmBinary") {
-                str += `await getBinary("${preloadKey}", "${blobURLOrPath}");\n`
-                break;
-            }
         }
 
-        str += super.runnerCode;
-
-        str += "\n})().catch((error) => { top.currentReject(error); });"
-
         return str;
-
     }
 };
 
@@ -1576,7 +1597,7 @@ let BENCHMARKS = [
         iterations: 60,
         tags: ["ARES"],
     }),
-    new DefaultBenchmark({
+    new AsyncBenchmark({
         name: "Babylon",
         files: [
             "./ARES-6/Babylon/index.js"
@@ -1612,7 +1633,7 @@ let BENCHMARKS = [
         tags: ["CDJS"],
     }),
     // CodeLoad
-    new DefaultBenchmark({
+    new AsyncBenchmark({
         name: "first-inspector-code-load",
         files: [
             "./code-load/code-first-load.js"
@@ -1622,7 +1643,7 @@ let BENCHMARKS = [
         },
         tags: ["CodeLoad"],
     }),
-    new DefaultBenchmark({
+    new AsyncBenchmark({
         name: "multi-inspector-code-load",
         files: [
             "./code-load/code-multi-load.js"

code-load/code-first-load.js

@@ -25,21 +25,8 @@
 
 let indirectEval = eval;
 class Benchmark {
-    constructor(iterations) {
-
-        let inspectorText;
-        if (isInBrowser) {
-            let request = new XMLHttpRequest();
-            request.open('GET', inspectorPayloadBlob, false);
-            request.send(null);
-            if (!request.responseText.length)
-                throw new Error("Expect non-empty sources");
-
-            inspectorText = request.responseText;
-        } else
-            inspectorText = readFile(inspectorPayloadBlob);
-
-        this.inspectorText = `let _____top_level_____ = ${Math.random()}; ${inspectorText}`;
+    async init() {
+        this.inspectorText = `let _____top_level_____ = ${Math.random()}; ${await getString(inspectorPayloadBlob)}`;
 
         this.index = 0;
     }

code-load/code-multi-load.js

@@ -25,20 +25,8 @@
 
 let indirectEval = eval;
 class Benchmark {
-    constructor(iterations) {
-
-        let inspectorText;
-        if (isInBrowser) {
-            let request = new XMLHttpRequest();
-            request.open('GET', inspectorPayloadBlob, false);
-            request.send(null);
-            if (!request.responseText.length)
-                throw new Error("Expect non-empty sources");
-            inspectorText = request.responseText;
-        } else
-            inspectorText = readFile(inspectorPayloadBlob);
-
-        this.inspectorText = `let _____top_level_____ = ${Math.random()}; ${inspectorText}`;
+    async init() {
+        this.inspectorText = `let _____top_level_____ = ${Math.random()}; ${await getString(inspectorPayloadBlob)}`;
         this.index = 0;
     }
 

sqlite3/benchmark.js

@@ -1,4 +1,5 @@
 // Copyright 2024 the V8 project authors. All rights reserved.
+// Copyright 2025 Apple Inc. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -51,6 +52,10 @@ delete globalThis.FileSystemHandle;
 class Benchmark {
   sqlite3Module;
 
+  async init() {
+    Module.wasmBinary = await getBinary(wasmBinary);
+  }
+
   async runIteration() {
     if (!this.sqlite3Module) {
       // Defined in the generated SQLite JavaScript code.

wasm/HashSet/benchmark.js

@@ -1,8 +1,13 @@
 // Copyright 2025 the V8 project authors. All rights reserved.
+// Copyright 2025 Apple Inc. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 class Benchmark {
+    async init() {
+        Module.wasmBinary = await getBinary(wasmBinary);
+    }
+
     async runIteration() {
         if (!Module._main)
             await setupModule(Module);

wasm/TSF/benchmark.js

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024 Apple Inc. All rights reserved.
+ * Copyright (C) 2024-2025 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -24,6 +24,10 @@
 */
 
 class Benchmark {
+    async init() {
+        Module.wasmBinary = await getBinary(wasmBinary);
+    }
+
     async runIteration() {
         if (!Module._runIteration)
             await setupModule(Module);

wasm/argon2/benchmark.js

@@ -76,6 +76,10 @@ const version = 0x13;
 const saltLength = 12;
 
 class Benchmark {
+    async init() {
+        Module.wasmBinary = await getBinary(wasmBinary);
+    }
+
     async runIteration() {
         // Instantiate the Wasm module before the first run.
         if (!Module._argon2_hash) {