Merge pull request #263 from sliemeobn/swift-embedded

Support for Embedded Swift (v2)

Author: kateinoigakukun

Examples/Basic/Package.swift

@@ -4,6 +4,9 @@ import PackageDescription
 
 let package = Package(
     name: "Basic",
+    platforms: [
+        .macOS(.v14)
+    ],
     dependencies: [.package(name: "JavaScriptKit", path: "../../")],
     targets: [
         .executableTarget(

Examples/Basic/build.sh

@@ -1 +1 @@
-swift build --swift-sdk DEVELOPMENT-SNAPSHOT-2024-07-09-a-wasm32-unknown-wasi -Xswiftc -Xclang-linker -Xswiftc -mexec-model=reactor -Xlinker --export=__main_argc_argv
+swift build --swift-sdk DEVELOPMENT-SNAPSHOT-2024-09-20-a-wasm32-unknown-wasi -Xswiftc -Xclang-linker -Xswiftc -mexec-model=reactor -Xlinker --export=__main_argc_argv

Examples/Embedded/.gitignore

@@ -0,0 +1,6 @@
+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+Package.resolved

Examples/Embedded/Package.swift

@@ -0,0 +1,20 @@
+// swift-tools-version:5.10
+
+import PackageDescription
+
+let package = Package(
+    name: "Embedded",
+    dependencies: [
+        .package(name: "JavaScriptKit", path: "../../"),
+        .package(url: "https://github.com/swifweb/EmbeddedFoundation", branch: "0.1.0")
+    ],
+    targets: [
+        .executableTarget(
+            name: "EmbeddedApp",
+            dependencies: [
+                "JavaScriptKit",
+                .product(name: "Foundation", package: "EmbeddedFoundation")
+            ]
+        )
+    ]
+)

Examples/Embedded/README.md

@@ -0,0 +1,8 @@
+# Embedded example
+
+Requires a recent DEVELOPMENT-SNAPSHOT toolchain. (tested with swift-DEVELOPMENT-SNAPSHOT-2024-09-25-a)
+
+```sh
+$ ./build.sh
+$ npx serve
+```

Examples/Embedded/Sources/EmbeddedApp/_thingsThatShouldNotBeNeeded.swift

@@ -0,0 +1,29 @@
+import JavaScriptKit
+
+// NOTE: it seems the embedded tree shaker gets rid of these exports if they are not used somewhere
+func _i_need_to_be_here_for_wasm_exports_to_work() {
+    _ = _swjs_library_features
+    _ = _swjs_call_host_function
+    _ = _swjs_free_host_function
+}
+
+// TODO: why do I need this? and surely this is not ideal... figure this out, or at least have this come from a C lib
+@_cdecl("strlen")
+func strlen(_ s: UnsafePointer<Int8>) -> Int {
+    var p = s
+    while p.pointee != 0 {
+        p += 1
+    }
+    return p - s
+}
+
+// TODO: why do I need this? and surely this is not ideal... figure this out, or at least have this come from a C lib
+@_cdecl("memmove")
+func memmove(_ dest: UnsafeMutableRawPointer, _ src: UnsafeRawPointer, _ n: Int) -> UnsafeMutableRawPointer {
+    let d = dest.assumingMemoryBound(to: UInt8.self)
+    let s = src.assumingMemoryBound(to: UInt8.self)
+    for i in 0..<n {
+        d[i] = s[i]
+    }
+    return dest
+}

Examples/Embedded/Sources/EmbeddedApp/main.swift

@@ -0,0 +1,26 @@
+import JavaScriptKit
+
+let alert = JSObject.global.alert.function!
+let document = JSObject.global.document
+
+print("Hello from WASM, document title: \(document.title.string ?? "")")
+
+var count = 0
+
+var divElement = document.createElement("div")
+divElement.innerText = .string("Count \(count)")
+_ = document.body.appendChild(divElement)
+
+var buttonElement = document.createElement("button")
+buttonElement.innerText = "Click me"
+buttonElement.onclick = JSValue.object(JSClosure { _ in
+    count += 1    
+    divElement.innerText = .string("Count \(count)")
+    return .undefined
+})
+
+_ = document.body.appendChild(buttonElement)
+
+func print(_ message: String) {
+    _ = JSObject.global.console.log(message)
+}