Add sharedMemory option to allow threads with shared memory (#247)

* Add `sharedMemory` option to allow threads with shared memory

* Enable thread enabled Swift SDK testing in CI

* Support shared memory in test harness

* Don't use symlink directory in the path of the program name

This is a workaround for the issue that the argv0 program path
containing a symlink directory in the path causes `Bundle.main` to
crash.

Author: kateinoigakukun

.github/workflows/test.yml

@@ -27,13 +27,12 @@ jobs:
               id: DEVELOPMENT-SNAPSHOT-2024-05-25-a-wasm32-unknown-wasi
               download-url: "https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2024-05-25-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2024-05-25-a-wasm32-unknown-wasi.artifactbundle.zip"
             wasi-backend: Node
-          # TODO: Enable this once we support threads in JavaScriptKit
-          # - os: ubuntu-22.04
-          #   toolchain: DEVELOPMENT-SNAPSHOT-2024-05-01-a
-          #   swift-sdk:
-          #     id: DEVELOPMENT-SNAPSHOT-2024-05-25-a-wasm32-unknown-wasip1-threads
-          #     download-url: "https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2024-05-25-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2024-05-25-a-wasm32-unknown-wasip1-threads.artifactbundle.zip"
-          #   wasi-backend: Node
+          - os: ubuntu-22.04
+            toolchain: DEVELOPMENT-SNAPSHOT-2024-05-01-a
+            swift-sdk:
+              id: DEVELOPMENT-SNAPSHOT-2024-05-25-a-wasm32-unknown-wasip1-threads
+              download-url: "https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2024-05-25-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2024-05-25-a-wasm32-unknown-wasip1-threads.artifactbundle.zip"
+            wasi-backend: Node
 
     runs-on: ${{ matrix.entry.os }}
     env:

IntegrationTests/lib.js

@@ -2,11 +2,12 @@ import { SwiftRuntime } from "javascript-kit-swift"
 import { WASI as NodeWASI } from "wasi"
 import { WASI as MicroWASI, useAll } from "uwasi"
 import * as fs from "fs/promises"
+import path from "path";
 
 const WASI = {
     MicroWASI: ({ programName }) => {
         const wasi = new MicroWASI({
-            args: [programName],
+            args: [path.basename(programName)],
             env: {},
             features: [useAll()],
         })
@@ -21,7 +22,7 @@ const WASI = {
     },
     Node: ({ programName }) => {
         const wasi = new NodeWASI({
-            args: [programName],
+            args: [path.basename(programName)],
             env: {},
             preopens: {
               "/": "./",
@@ -51,21 +52,49 @@ const selectWASIBackend = () => {
     return WASI.Node;
 };
 
+function isUsingSharedMemory(module) {
+    const imports = WebAssembly.Module.imports(module);
+    for (const entry of imports) {
+        if (entry.module === "env" && entry.name === "memory" && entry.kind == "memory") {
+            return true;
+        }
+    }
+    return false;
+}
+
 export const startWasiTask = async (wasmPath, wasiConstructor = selectWASIBackend()) => {
     const swift = new SwiftRuntime();
     // Fetch our Wasm File
     const wasmBinary = await fs.readFile(wasmPath);
     const wasi = wasiConstructor({ programName: wasmPath });
 
-    // Instantiate the WebAssembly file
-    let { instance } = await WebAssembly.instantiate(wasmBinary, {
+    const module = await WebAssembly.compile(wasmBinary);
+
+    const importObject = {
         wasi_snapshot_preview1: wasi.wasiImport,
         javascript_kit: swift.importObjects(),
         benchmark_helper: {
             noop: () => {},
             noop_with_int: (_) => {},
         }
-    });
+    };
+
+    if (isUsingSharedMemory(module)) {
+        importObject["env"] = {
+          // We don't have JS API to get memory descriptor of imported memory
+          // at this moment, so we assume 256 pages (16MB) memory is enough
+          // large for initial memory size.
+          memory: new WebAssembly.Memory({ initial: 256, maximum: 16384, shared: true }),
+        };
+        importObject["wasi"] = {
+          "thread-spawn": () => {
+            throw new Error("thread-spawn not implemented");
+          }
+        }
+    }
+
+    // Instantiate the WebAssembly file
+    const instance = await WebAssembly.instantiate(module, importObject);
 
     swift.setInstance(instance);
     // Start the WebAssembly WASI instance!

Makefile

@@ -28,7 +28,7 @@ test:
 unittest:
 	@echo Running unit tests
 	swift build --build-tests -Xswiftc -Xclang-linker -Xswiftc -mexec-model=reactor -Xlinker --export-if-defined=main -Xlinker --export-if-defined=__main_argc_argv --static-swift-stdlib -Xswiftc -static-stdlib $(SWIFT_BUILD_FLAGS)
-	node --experimental-wasi-unstable-preview1 scripts/test-harness.mjs ./.build/wasm32-unknown-wasi/debug/JavaScriptKitPackageTests.wasm
+	node --experimental-wasi-unstable-preview1 scripts/test-harness.mjs ./.build/debug/JavaScriptKitPackageTests.wasm
 
 .PHONY: benchmark_setup
 benchmark_setup: