Add wasm task

2023-04-28 00:43:03 +04:00 · 2023-04-28 00:43:03 +04:00 · b93565cd9e
commit b93565cd9e
parent eb4ca00c4d
16 changed files with 1511 additions and 0 deletions
--- a/.deadlines.yml
+++ b/.deadlines.yml
@ -10,6 +10,8 @@
      score: 200
      watch:
        - distbuild/pkg/scheduler
+    - task: wasm
+      score: 300

 # - group:    Analysis
 #   start:    05-05-2022 18:00
--- a/.private
+++ b/.private
@ -0,0 +1 @@
+wasm/flappygopher/main_solution.go
--- a/tools/testtool/commands/list.go
+++ b/tools/testtool/commands/list.go
@ -109,6 +109,22 @@ func listPrivateFiles(rootPackage string) []string {
 		log.Fatalf("filewalk failed: %v", err)
 	}

+	config, err := os.ReadFile(".private")
+	if err != nil && !os.IsNotExist(err) {
+		log.Fatalf("failed: %v", err)
+	}
+
+	for _, line := range strings.Split(string(config), "\n") {
+		line = strings.Trim(line, " ")
+		if line != "" {
+			fname, _ := filepath.Abs(line)
+			_, err := os.Stat(fname)
+			if err == nil {
+				files = append(files, fname)
+			}
+		}
+	}
+
 	sort.Strings(files)
 	return files
 }
--- a/wasm/README.md
+++ b/wasm/README.md
@ -0,0 +1,95 @@
+# wasm
+
+В этой задаче вам нужно научиться запускать go в браузере и работать с API браузера.
+
+Автоматических тестов в задаче нет, нужно решить задачу, поменять константу в файле `done.go`
+и послать код в систему. Мы проверим код глазами. Если задача не решена на самом деле,
+мы умножим оценку на -1.
+
+## Сборка и запуск
+
+Код нужно писать в файле `flappygopher/main.go`. Чтобы собрать код, нужно выставить переменные окружения
+`GOOS` и `GOARCH`. Обычно `GOOS` (читается как гус) задаёт операционную систему, под которую нужно собрать
+код. А `GOARCH` задаёт архитектуру процессора, под которую нужно собрать код.
+
+В данном случае, код собирается для браузера и сохраняется в формате WASM.
+
+```
+# Внутри директории wasm/flappygopher
+env GOOS=js GOARCH=wasm go build -o flappygopher.wasm
+```
+
+В директории `flappygopher` находится отдельный go модуль, чтобы его можно было открыть как отдельный проект.
+Отдельный проект позволяет настроить `GOOS` и `GOARCH`, так чтобы в IDE работал автокомплит.
+Чтобы настроить эти переменные в vscode, нужно выставить настройку `go.toolsEnvVars`.
+В других IDE, ищите инструкцию сами.
+
+```
+prime@fedora ~/C/s/w/flappygopher (master)> cat .vscode/settings.json
+{
+    "go.toolsEnvVars": {
+        "GOOS": "js",
+        "GOARCH": "wasm",
+    }
+}
+```
+
+После того как вы собрали код, нужно запустить web сервер для раздачи файлов. Проще всего
+воспользоваться питоном.
+
+```
+prime@fedora ~/C/s/w/flappygopher (master)> python3 -m http.server
+Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...
+```
+
+Перейдите по ссылке и откройте инструменты разработчика. В `javascript` консоли вы должны увидеть
+сообщение об ошибке. На линуксе консоль открывается комбинацией `Ctrl+Shift+i`.
+
+![error](./error.png)
+
+Если ошибка такая как на скриншоте (паника из го) - то все хорошо. Если какая-то другая, то
+значит у вас проблемы с окружением.
+
+Поправьте код, уберите панику и вставьте `fmt.Println("Hello, JS")`. Пересоберите код.
+Обновите страницу в браузере. (питон сервер должен работать в отдельной вкладке, перезапускать его не нужно). 
+Ошибка должна уйти и вместо неё появиться ваше сообщение.
+
+## Файлы с исходным кодом
+
+В проекте есть несколько файлов. Вам нужно понимать их смысл.
+
+ - `index.html` - эта та страница, которую открывает браузер. Этот файл менять не нужно.
+   В начале файла записан код, который загружает, инициализирует и запускает WASM файл.
+ - `wasm_exec.js` - код на js, который распространяется вместе с go тулчейном. Этот код настраивает
+   взаимодействие с go со стороны js. Внутрь wasm модуля нельзя положить js код,
+   а какой-то js код для bootstrap всего Go рантайма нужен. Поэтому этот код
+   распространяется как отдельный файл.
+ - `main.go` - ваш код на go, который будет загружен и запущен. Внутри будет вызвана
+   функция `main`. Код внутри `main.go` может использовать пакет [`syscall/js`](https://pkg.go.dev/syscall/js) для взаимодействия
+   с браузером. Также можно использовать пакеты [`honnef.co/go/js/dom/v2`](https://pkg.go.dev/honnef.co/go/js/dom/v2)
+   и [`console`](./console/console.go).
+
+## Задача
+
+![screen](./screenshot.png)
+
+Попробуйте написать игру flappybird, используя [Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API).
+
+Для этого нужно:
+
+  1. Создать `<canvas>` элемент на странице и получить на него ссылку.
+  2. Получить из элемента `2d` контекст для рисования.
+  3. Запустить цикл игры, используя `requestAnimationFrame`. Эта функция
+     просит браузер вызвать колбек перед отрисовкой следующего кадра.
+  4. В этом колбеке вы должны:
+     * Обновить состояние игры
+     * Очистить канвас и нарисовать на нём новый фрейм.
+     * Зашедулить следующий фрейм, используя `requestAnimationFrame`
+
+## Советы
+
+* В `js/dom` есть баг в функции [`drawImage`](https://github.com/dominikh/go-js-dom/pull/84/files#diff-93cd0c9358c072a082261eee3d3d83d5305dadabac1a2b25ba084d94ed8b3495R2394). Если вам потребуется
+эта функция, делайте вызов через нетипизированное API.
+* Чтобы разобраться с Canvas API, посмотрите [туториалы](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Basic_usage#a_simple_example). Транслировать их на го придётся самим.
+* Вы можете создавать `<canvas>` элемент из go, используя `document.createElement`, 
+  или вписать элемент в html и получить на него ссылку по id.
--- a/wasm/done.go
+++ b/wasm/done.go
@ -0,0 +1,5 @@
+//go:build !solution
+
+package wasm
+
+const done = false
--- a/wasm/done_test.go
+++ b/wasm/done_test.go
@ -0,0 +1,11 @@
+package wasm
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOK(t *testing.T) {
+	require.True(t, done)
+}
--- a/wasm/error.png
+++ b/wasm/error.png
--- a/wasm/flappygopher/.gitignore
+++ b/wasm/flappygopher/.gitignore
@ -0,0 +1 @@
+flappygopher.wasm
--- a/wasm/flappygopher/console/console.go
+++ b/wasm/flappygopher/console/console.go
@ -0,0 +1,172 @@
+// Package console provides wrapper to javascript console.
+//
+// Some functions support format specifiers. The following specifiers
+// are supported:
+//
+//	%s – Formats the value as a string
+//	%d – Formats the value as an integer
+//	%i – Same as %d
+//	%f – Formats the value as a floating point value.
+//	%o – Formats the value as an expandable DOM element (as in the Elements panel).
+//	%O – Formats the value as an expandable JavaScript object.
+//	%c – Formats the output string according to CSS styles you provide.
+//
+// This package does not provide functions for the aliases
+// console.debug and console.info – use Log instead.
+//
+// For a more detailed explanation of the APIs, see for example
+// Google's documentation at
+// https://developers.google.com/chrome-developer-tools/docs/console-api.
+//
+// Portions of this documentation are modifications based on work
+// created and shared by Google and used according to terms described
+// in the Creative Commons 3.0 Attribution License.
+package console
+
+import (
+	"bytes"
+	"syscall/js"
+)
+
+var c = js.Global().Get("console")
+
+// Assert writes msg to the console if b is false.
+func Assert(b bool, msg interface{}) {
+	c.Call("assert", b, msg)
+}
+
+// Clear clears the console.
+func Clear() {
+	c.Call("clear")
+}
+
+// Count writes the number of times that it has been invoked at the
+// same line and with the same label.
+func Count(label string) {
+	c.Call("count", label)
+}
+
+// Dir prints a JavaScript representation of the specified object. If
+// the object being logged is an HTML element, then the properties of
+// its DOM representation are displayed.
+func Dir(obj interface{}) {
+	c.Call("dir", obj)
+}
+
+// DirXML Prints an XML representation of the specified object. For
+// HTML elements, calling this method is equivalent to calling Log.
+func DirXML(obj interface{}) {
+	c.Call("dirxml", obj)
+}
+
+// Error is like Log but also includes a stack trace.
+func Error(objs ...interface{}) {
+	c.Call("error", objs...)
+}
+
+// Group starts a new logging group with an optional title.
+//
+// All console output that occurs after calling this function appears
+// in the same visual group. Groups can be nested.
+//
+// The title will be generated according to the rules of the Log
+// function.
+func Group(objs ...interface{}) {
+	c.Call("group", objs...)
+}
+
+// GroupCollapsed is like Group, except that the newly created
+// group starts collapsed instead of open.
+func GroupCollapsed(objs ...interface{}) {
+	c.Call("groupCollapsed", objs...)
+}
+
+// GroupEnd closes the currently active logging group.
+func GroupEnd() {
+	c.Call("groupEnd")
+}
+
+// Log displays a message in the console. You pass one or more objects
+// to this method, each of which are evaluated and concatenated into a
+// space-delimited string. The first parameter you pass to Log may
+// contain format specifiers.
+func Log(objs ...interface{}) {
+	c.Call("log", objs...)
+}
+
+// Profile starts a new CPU profile with an optional label.
+func Profile(label interface{}) {
+	c.Call("profile", label)
+}
+
+// ProfileEnd stops the currently running CPU profile, if any.
+func ProfileEnd() {
+	c.Call("profileEnd")
+}
+
+// Time starts a new timer with an associated label. Calling TimeEnd
+// with the same label will stop the timer and print the elapsed time.
+func Time(label interface{}) {
+	c.Call("time", label)
+}
+
+// TimeEnd ends a timer that was started with Time and prints the
+// elapsed time.
+func TimeEnd(label interface{}) {
+	c.Call("timeEnd", label)
+}
+
+// Timestamp adds an event to the timeline during a recording session.
+func Timestamp(label interface{}) {
+	c.Call("timeStamp", label)
+}
+
+// Trace prints a stack trace, starting from the point where Trace was
+// called.
+func Trace() {
+	c.Call("trace")
+}
+
+// Warn is like Log but displays a different icon alongside the
+// message.
+func Warn(objs ...interface{}) {
+	c.Call("warn", objs...)
+}
+
+// Writer implements an io.Writer on top of the JavaScript console.
+// Writes will be buffered until a newline is encountered, which will
+// cause flushing up to the newline.
+type Writer struct {
+	buf *bytes.Buffer
+}
+
+func (w *Writer) Write(buf []byte) (n int, err error) {
+	if len(buf) == 0 {
+		return 0, nil
+	}
+
+	for i := len(buf); i >= 0; i-- {
+		if buf[i] == '\n' {
+			w.buf.Write(buf[:i])
+			Log(w.buf.String())
+			w.buf.Reset()
+			w.buf.Write(buf[i+1:])
+			break
+		}
+	}
+
+	return len(buf), nil
+}
+
+func (w *Writer) WriteString(s string) (n int, err error) {
+	return w.Write([]byte(s))
+}
+
+// Flush will flush the current line to the console.
+func (w *Writer) Flush() {
+	w.Write([]byte{'\n'})
+}
+
+func New() *Writer {
+	return &Writer{buf: new(bytes.Buffer)}
+}
--- a/wasm/flappygopher/go.mod
+++ b/wasm/flappygopher/go.mod
@ -0,0 +1,7 @@
+module gitlab.com/slon/shad-go/wasm/flappygopher
+
+go 1.20
+
+require (
+	honnef.co/go/js/dom/v2 v2.0.0-20221001195520-26252dedbe70
+)
--- a/wasm/flappygopher/go.sum
+++ b/wasm/flappygopher/go.sum
@ -0,0 +1,590 @@
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--- a/wasm/flappygopher/gopher.png
+++ b/wasm/flappygopher/gopher.png
--- a/wasm/flappygopher/index.html
+++ b/wasm/flappygopher/index.html
@ -0,0 +1,47 @@
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Go wasm</title>
+
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inter&display=swap" rel="stylesheet">    
+    <script src="wasm_exec.js"></script>
+    <script>
+      if (!WebAssembly.instantiateStreaming) {
+        // polyfill
+        WebAssembly.instantiateStreaming = async (resp, importObject) => {
+          const source = await (await resp).arrayBuffer();
+          return await WebAssembly.instantiate(source, importObject);
+        };
+      }
+
+      async function run() {
+        try {
+          const go = new Go();
+
+          const result = await WebAssembly.instantiateStreaming(
+            fetch("flappygopher.wasm"),
+            go.importObject
+          );
+
+          await go.run(result.instance);
+        } catch (err) {
+          console.error(err);
+        }
+      }
+
+      run();
+    </script>
+
+    <style>
+      body {
+        margin: 0;
+        width: 100%;
+        height: 100%;
+      }
+    </style>
+  </head>
+
+  <body></body>
+</html>
--- a/wasm/flappygopher/main.go
+++ b/wasm/flappygopher/main.go
@ -0,0 +1,10 @@
+//go:build !solution
+
+package main
+
+func main() {
+	panic("implement me")
+
+	// main must keep running
+	select {}
+}
--- a/wasm/flappygopher/wasm_exec.js
+++ b/wasm/flappygopher/wasm_exec.js
@ -0,0 +1,554 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+"use strict";
+
+(() => {
+	const enosys = () => {
+		const err = new Error("not implemented");
+		err.code = "ENOSYS";
+		return err;
+	};
+
+	if (!globalThis.fs) {
+		let outputBuf = "";
+		globalThis.fs = {
+			constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
+			writeSync(fd, buf) {
+				outputBuf += decoder.decode(buf);
+				const nl = outputBuf.lastIndexOf("\n");
+				if (nl != -1) {
+					console.log(outputBuf.substring(0, nl));
+					outputBuf = outputBuf.substring(nl + 1);
+				}
+				return buf.length;
+			},
+			write(fd, buf, offset, length, position, callback) {
+				if (offset !== 0 || length !== buf.length || position !== null) {
+					callback(enosys());
+					return;
+				}
+				const n = this.writeSync(fd, buf);
+				callback(null, n);
+			},
+			chmod(path, mode, callback) { callback(enosys()); },
+			chown(path, uid, gid, callback) { callback(enosys()); },
+			close(fd, callback) { callback(enosys()); },
+			fchmod(fd, mode, callback) { callback(enosys()); },
+			fchown(fd, uid, gid, callback) { callback(enosys()); },
+			fstat(fd, callback) { callback(enosys()); },
+			fsync(fd, callback) { callback(null); },
+			ftruncate(fd, length, callback) { callback(enosys()); },
+			lchown(path, uid, gid, callback) { callback(enosys()); },
+			link(path, link, callback) { callback(enosys()); },
+			lstat(path, callback) { callback(enosys()); },
+			mkdir(path, perm, callback) { callback(enosys()); },
+			open(path, flags, mode, callback) { callback(enosys()); },
+			read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
+			readdir(path, callback) { callback(enosys()); },
+			readlink(path, callback) { callback(enosys()); },
+			rename(from, to, callback) { callback(enosys()); },
+			rmdir(path, callback) { callback(enosys()); },
+			stat(path, callback) { callback(enosys()); },
+			symlink(path, link, callback) { callback(enosys()); },
+			truncate(path, length, callback) { callback(enosys()); },
+			unlink(path, callback) { callback(enosys()); },
+			utimes(path, atime, mtime, callback) { callback(enosys()); },
+		};
+	}
+
+	if (!globalThis.process) {
+		globalThis.process = {
+			getuid() { return -1; },
+			getgid() { return -1; },
+			geteuid() { return -1; },
+			getegid() { return -1; },
+			getgroups() { throw enosys(); },
+			pid: -1,
+			ppid: -1,
+			umask() { throw enosys(); },
+			cwd() { throw enosys(); },
+			chdir() { throw enosys(); },
+		}
+	}
+
+	if (!globalThis.crypto) {
+		throw new Error("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)");
+	}
+
+	if (!globalThis.performance) {
+		throw new Error("globalThis.performance is not available, polyfill required (performance.now only)");
+	}
+
+	if (!globalThis.TextEncoder) {
+		throw new Error("globalThis.TextEncoder is not available, polyfill required");
+	}
+
+	if (!globalThis.TextDecoder) {
+		throw new Error("globalThis.TextDecoder is not available, polyfill required");
+	}
+
+	const encoder = new TextEncoder("utf-8");
+	const decoder = new TextDecoder("utf-8");
+
+	globalThis.Go = class {
+		constructor() {
+			this.argv = ["js"];
+			this.env = {};
+			this.exit = (code) => {
+				if (code !== 0) {
+					console.warn("exit code:", code);
+				}
+			};
+			this._exitPromise = new Promise((resolve) => {
+				this._resolveExitPromise = resolve;
+			});
+			this._pendingEvent = null;
+			this._scheduledTimeouts = new Map();
+			this._nextCallbackTimeoutID = 1;
+
+			const setInt64 = (addr, v) => {
+				this.mem.setUint32(addr + 0, v, true);
+				this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
+			}
+
+			const getInt64 = (addr) => {
+				const low = this.mem.getUint32(addr + 0, true);
+				const high = this.mem.getInt32(addr + 4, true);
+				return low + high * 4294967296;
+			}
+
+			const loadValue = (addr) => {
+				const f = this.mem.getFloat64(addr, true);
+				if (f === 0) {
+					return undefined;
+				}
+				if (!isNaN(f)) {
+					return f;
+				}
+
+				const id = this.mem.getUint32(addr, true);
+				return this._values[id];
+			}
+
+			const storeValue = (addr, v) => {
+				const nanHead = 0x7FF80000;
+
+				if (typeof v === "number" && v !== 0) {
+					if (isNaN(v)) {
+						this.mem.setUint32(addr + 4, nanHead, true);
+						this.mem.setUint32(addr, 0, true);
+						return;
+					}
+					this.mem.setFloat64(addr, v, true);
+					return;
+				}
+
+				if (v === undefined) {
+					this.mem.setFloat64(addr, 0, true);
+					return;
+				}
+
+				let id = this._ids.get(v);
+				if (id === undefined) {
+					id = this._idPool.pop();
+					if (id === undefined) {
+						id = this._values.length;
+					}
+					this._values[id] = v;
+					this._goRefCounts[id] = 0;
+					this._ids.set(v, id);
+				}
+				this._goRefCounts[id]++;
+				let typeFlag = 0;
+				switch (typeof v) {
+					case "object":
+						if (v !== null) {
+							typeFlag = 1;
+						}
+						break;
+					case "string":
+						typeFlag = 2;
+						break;
+					case "symbol":
+						typeFlag = 3;
+						break;
+					case "function":
+						typeFlag = 4;
+						break;
+				}
+				this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
+				this.mem.setUint32(addr, id, true);
+			}
+
+			const loadSlice = (addr) => {
+				const array = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				return new Uint8Array(this._inst.exports.mem.buffer, array, len);
+			}
+
+			const loadSliceOfValues = (addr) => {
+				const array = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				const a = new Array(len);
+				for (let i = 0; i < len; i++) {
+					a[i] = loadValue(array + i * 8);
+				}
+				return a;
+			}
+
+			const loadString = (addr) => {
+				const saddr = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
+			}
+
+			const timeOrigin = Date.now() - performance.now();
+			this.importObject = {
+				go: {
+					// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
+					// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
+					// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
+					// This changes the SP, thus we have to update the SP used by the imported function.
+
+					// func wasmExit(code int32)
+					"runtime.wasmExit": (sp) => {
+						sp >>>= 0;
+						const code = this.mem.getInt32(sp + 8, true);
+						this.exited = true;
+						delete this._inst;
+						delete this._values;
+						delete this._goRefCounts;
+						delete this._ids;
+						delete this._idPool;
+						this.exit(code);
+					},
+
+					// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
+					"runtime.wasmWrite": (sp) => {
+						sp >>>= 0;
+						const fd = getInt64(sp + 8);
+						const p = getInt64(sp + 16);
+						const n = this.mem.getInt32(sp + 24, true);
+						fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
+					},
+
+					// func resetMemoryDataView()
+					"runtime.resetMemoryDataView": (sp) => {
+						sp >>>= 0;
+						this.mem = new DataView(this._inst.exports.mem.buffer);
+					},
+
+					// func nanotime1() int64
+					"runtime.nanotime1": (sp) => {
+						sp >>>= 0;
+						setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
+					},
+
+					// func walltime() (sec int64, nsec int32)
+					"runtime.walltime": (sp) => {
+						sp >>>= 0;
+						const msec = (new Date).getTime();
+						setInt64(sp + 8, msec / 1000);
+						this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
+					},
+
+					// func scheduleTimeoutEvent(delay int64) int32
+					"runtime.scheduleTimeoutEvent": (sp) => {
+						sp >>>= 0;
+						const id = this._nextCallbackTimeoutID;
+						this._nextCallbackTimeoutID++;
+						this._scheduledTimeouts.set(id, setTimeout(
+							() => {
+								this._resume();
+								while (this._scheduledTimeouts.has(id)) {
+									// for some reason Go failed to register the timeout event, log and try again
+									// (temporary workaround for https://github.com/golang/go/issues/28975)
+									console.warn("scheduleTimeoutEvent: missed timeout event");
+									this._resume();
+								}
+							},
+							getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
+						));
+						this.mem.setInt32(sp + 16, id, true);
+					},
+
+					// func clearTimeoutEvent(id int32)
+					"runtime.clearTimeoutEvent": (sp) => {
+						sp >>>= 0;
+						const id = this.mem.getInt32(sp + 8, true);
+						clearTimeout(this._scheduledTimeouts.get(id));
+						this._scheduledTimeouts.delete(id);
+					},
+
+					// func getRandomData(r []byte)
+					"runtime.getRandomData": (sp) => {
+						sp >>>= 0;
+						crypto.getRandomValues(loadSlice(sp + 8));
+					},
+
+					// func finalizeRef(v ref)
+					"syscall/js.finalizeRef": (sp) => {
+						sp >>>= 0;
+						const id = this.mem.getUint32(sp + 8, true);
+						this._goRefCounts[id]--;
+						if (this._goRefCounts[id] === 0) {
+							const v = this._values[id];
+							this._values[id] = null;
+							this._ids.delete(v);
+							this._idPool.push(id);
+						}
+					},
+
+					// func stringVal(value string) ref
+					"syscall/js.stringVal": (sp) => {
+						sp >>>= 0;
+						storeValue(sp + 24, loadString(sp + 8));
+					},
+
+					// func valueGet(v ref, p string) ref
+					"syscall/js.valueGet": (sp) => {
+						sp >>>= 0;
+						const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
+						sp = this._inst.exports.getsp() >>> 0; // see comment above
+						storeValue(sp + 32, result);
+					},
+
+					// func valueSet(v ref, p string, x ref)
+					"syscall/js.valueSet": (sp) => {
+						sp >>>= 0;
+						Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
+					},
+
+					// func valueDelete(v ref, p string)
+					"syscall/js.valueDelete": (sp) => {
+						sp >>>= 0;
+						Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
+					},
+
+					// func valueIndex(v ref, i int) ref
+					"syscall/js.valueIndex": (sp) => {
+						sp >>>= 0;
+						storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
+					},
+
+					// valueSetIndex(v ref, i int, x ref)
+					"syscall/js.valueSetIndex": (sp) => {
+						sp >>>= 0;
+						Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
+					},
+
+					// func valueCall(v ref, m string, args []ref) (ref, bool)
+					"syscall/js.valueCall": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const m = Reflect.get(v, loadString(sp + 16));
+							const args = loadSliceOfValues(sp + 32);
+							const result = Reflect.apply(m, v, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 56, result);
+							this.mem.setUint8(sp + 64, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 56, err);
+							this.mem.setUint8(sp + 64, 0);
+						}
+					},
+
+					// func valueInvoke(v ref, args []ref) (ref, bool)
+					"syscall/js.valueInvoke": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const args = loadSliceOfValues(sp + 16);
+							const result = Reflect.apply(v, undefined, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, result);
+							this.mem.setUint8(sp + 48, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, err);
+							this.mem.setUint8(sp + 48, 0);
+						}
+					},
+
+					// func valueNew(v ref, args []ref) (ref, bool)
+					"syscall/js.valueNew": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const args = loadSliceOfValues(sp + 16);
+							const result = Reflect.construct(v, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, result);
+							this.mem.setUint8(sp + 48, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, err);
+							this.mem.setUint8(sp + 48, 0);
+						}
+					},
+
+					// func valueLength(v ref) int
+					"syscall/js.valueLength": (sp) => {
+						sp >>>= 0;
+						setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
+					},
+
+					// valuePrepareString(v ref) (ref, int)
+					"syscall/js.valuePrepareString": (sp) => {
+						sp >>>= 0;
+						const str = encoder.encode(String(loadValue(sp + 8)));
+						storeValue(sp + 16, str);
+						setInt64(sp + 24, str.length);
+					},
+
+					// valueLoadString(v ref, b []byte)
+					"syscall/js.valueLoadString": (sp) => {
+						sp >>>= 0;
+						const str = loadValue(sp + 8);
+						loadSlice(sp + 16).set(str);
+					},
+
+					// func valueInstanceOf(v ref, t ref) bool
+					"syscall/js.valueInstanceOf": (sp) => {
+						sp >>>= 0;
+						this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
+					},
+
+					// func copyBytesToGo(dst []byte, src ref) (int, bool)
+					"syscall/js.copyBytesToGo": (sp) => {
+						sp >>>= 0;
+						const dst = loadSlice(sp + 8);
+						const src = loadValue(sp + 32);
+						if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
+							this.mem.setUint8(sp + 48, 0);
+							return;
+						}
+						const toCopy = src.subarray(0, dst.length);
+						dst.set(toCopy);
+						setInt64(sp + 40, toCopy.length);
+						this.mem.setUint8(sp + 48, 1);
+					},
+
+					// func copyBytesToJS(dst ref, src []byte) (int, bool)
+					"syscall/js.copyBytesToJS": (sp) => {
+						sp >>>= 0;
+						const dst = loadValue(sp + 8);
+						const src = loadSlice(sp + 16);
+						if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
+							this.mem.setUint8(sp + 48, 0);
+							return;
+						}
+						const toCopy = src.subarray(0, dst.length);
+						dst.set(toCopy);
+						setInt64(sp + 40, toCopy.length);
+						this.mem.setUint8(sp + 48, 1);
+					},
+
+					"debug": (value) => {
+						console.log(value);
+					},
+				}
+			};
+		}
+
+		async run(instance) {
+			if (!(instance instanceof WebAssembly.Instance)) {
+				throw new Error("Go.run: WebAssembly.Instance expected");
+			}
+			this._inst = instance;
+			this.mem = new DataView(this._inst.exports.mem.buffer);
+			this._values = [ // JS values that Go currently has references to, indexed by reference id
+				NaN,
+				0,
+				null,
+				true,
+				false,
+				globalThis,
+				this,
+			];
+			this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
+			this._ids = new Map([ // mapping from JS values to reference ids
+				[0, 1],
+				[null, 2],
+				[true, 3],
+				[false, 4],
+				[globalThis, 5],
+				[this, 6],
+			]);
+			this._idPool = [];   // unused ids that have been garbage collected
+			this.exited = false; // whether the Go program has exited
+
+			// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
+			let offset = 4096;
+
+			const strPtr = (str) => {
+				const ptr = offset;
+				const bytes = encoder.encode(str + "\0");
+				new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
+				offset += bytes.length;
+				if (offset % 8 !== 0) {
+					offset += 8 - (offset % 8);
+				}
+				return ptr;
+			};
+
+			const argc = this.argv.length;
+
+			const argvPtrs = [];
+			this.argv.forEach((arg) => {
+				argvPtrs.push(strPtr(arg));
+			});
+			argvPtrs.push(0);
+
+			const keys = Object.keys(this.env).sort();
+			keys.forEach((key) => {
+				argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
+			});
+			argvPtrs.push(0);
+
+			const argv = offset;
+			argvPtrs.forEach((ptr) => {
+				this.mem.setUint32(offset, ptr, true);
+				this.mem.setUint32(offset + 4, 0, true);
+				offset += 8;
+			});
+
+			// The linker guarantees global data starts from at least wasmMinDataAddr.
+			// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
+			const wasmMinDataAddr = 4096 + 8192;
+			if (offset >= wasmMinDataAddr) {
+				throw new Error("total length of command line and environment variables exceeds limit");
+			}
+
+			this._inst.exports.run(argc, argv);
+			if (this.exited) {
+				this._resolveExitPromise();
+			}
+			await this._exitPromise;
+		}
+
+		_resume() {
+			if (this.exited) {
+				throw new Error("Go program has already exited");
+			}
+			this._inst.exports.resume();
+			if (this.exited) {
+				this._resolveExitPromise();
+			}
+		}
+
+		_makeFuncWrapper(id) {
+			const go = this;
+			return function () {
+				const event = { id: id, this: this, args: arguments };
+				go._pendingEvent = event;
+				go._resume();
+				return event.result;
+			};
+		}
+	}
+})();
--- a/wasm/screenshot.png
+++ b/wasm/screenshot.png