Update wasm_exec.js
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6C9D970C50D26A25
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@ -1 +1,2 @@
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dist/
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assets/main.wasm
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2
Makefile
2
Makefile
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@ -1,4 +1,4 @@
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build:
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mkdir -p dist/
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GOOS=js GOARCH=wasm go build -o assets/json.wasm ./cmd/wasm
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GOOS=js GOARCH=wasm go build -o assets/main.wasm ./cmd/wasm
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go build -o dist/wasm-example-server .
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@ -4,7 +4,7 @@
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<script src="wasm_exec.js"></script>
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<script>
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const go = new Go();
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WebAssembly.instantiateStreaming(fetch("json.wasm"), go.importObject).then((result) => {
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WebAssembly.instantiateStreaming(fetch("main.wasm"), go.importObject).then((result) => {
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go.run(result.instance);
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});
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</script>
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BIN
assets/json.wasm
BIN
assets/json.wasm
Binary file not shown.
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@ -2,54 +2,25 @@
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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"use strict";
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(() => {
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// Map multiple JavaScript environments to a single common API,
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// preferring web standards over Node.js API.
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//
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// Environments considered:
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// - Browsers
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// - Node.js
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// - Electron
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// - Parcel
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// - Webpack
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if (typeof global !== "undefined") {
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// global already exists
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} else if (typeof window !== "undefined") {
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window.global = window;
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} else if (typeof self !== "undefined") {
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self.global = self;
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} else {
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throw new Error("cannot export Go (neither global, window nor self is defined)");
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}
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if (!global.require && typeof require !== "undefined") {
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global.require = require;
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}
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if (!global.fs && global.require) {
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const fs = require("fs");
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if (typeof fs === "object" && fs !== null && Object.keys(fs).length !== 0) {
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global.fs = fs;
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}
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}
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const enosys = () => {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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return err;
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};
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if (!global.fs) {
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if (!globalThis.fs) {
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let outputBuf = "";
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global.fs = {
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globalThis.fs = {
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constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
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writeSync(fd, buf) {
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outputBuf += decoder.decode(buf);
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const nl = outputBuf.lastIndexOf("\n");
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if (nl != -1) {
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console.log(outputBuf.substr(0, nl));
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outputBuf = outputBuf.substr(nl + 1);
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console.log(outputBuf.substring(0, nl));
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outputBuf = outputBuf.substring(nl + 1);
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}
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return buf.length;
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},
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@ -87,8 +58,8 @@
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};
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}
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if (!global.process) {
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global.process = {
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if (!globalThis.process) {
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globalThis.process = {
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getuid() { return -1; },
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getgid() { return -1; },
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geteuid() { return -1; },
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@ -102,47 +73,26 @@
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}
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}
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if (!global.crypto && global.require) {
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const nodeCrypto = require("crypto");
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global.crypto = {
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getRandomValues(b) {
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nodeCrypto.randomFillSync(b);
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},
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};
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}
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if (!global.crypto) {
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throw new Error("global.crypto is not available, polyfill required (getRandomValues only)");
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if (!globalThis.crypto) {
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throw new Error("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)");
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}
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if (!global.performance) {
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global.performance = {
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now() {
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const [sec, nsec] = process.hrtime();
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return sec * 1000 + nsec / 1000000;
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},
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};
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if (!globalThis.performance) {
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throw new Error("globalThis.performance is not available, polyfill required (performance.now only)");
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}
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if (!global.TextEncoder && global.require) {
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global.TextEncoder = require("util").TextEncoder;
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}
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if (!global.TextEncoder) {
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throw new Error("global.TextEncoder is not available, polyfill required");
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if (!globalThis.TextEncoder) {
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throw new Error("globalThis.TextEncoder is not available, polyfill required");
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}
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if (!global.TextDecoder && global.require) {
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global.TextDecoder = require("util").TextDecoder;
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if (!globalThis.TextDecoder) {
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throw new Error("globalThis.TextDecoder is not available, polyfill required");
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}
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if (!global.TextDecoder) {
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throw new Error("global.TextDecoder is not available, polyfill required");
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}
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// End of polyfills for common API.
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const encoder = new TextEncoder("utf-8");
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const decoder = new TextDecoder("utf-8");
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global.Go = class {
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globalThis.Go = class {
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constructor() {
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this.argv = ["js"];
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this.env = {};
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@ -163,6 +113,10 @@
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this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
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}
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const setInt32 = (addr, v) => {
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this.mem.setUint32(addr + 0, v, true);
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}
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const getInt64 = (addr) => {
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const low = this.mem.getUint32(addr + 0, true);
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const high = this.mem.getInt32(addr + 4, true);
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@ -256,7 +210,10 @@
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const timeOrigin = Date.now() - performance.now();
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this.importObject = {
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go: {
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_gotest: {
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add: (a, b) => a + b,
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},
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gojs: {
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// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
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// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
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// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
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@ -319,7 +276,7 @@
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this._resume();
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}
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},
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getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
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getInt64(sp + 8),
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));
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this.mem.setInt32(sp + 16, id, true);
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},
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@ -517,7 +474,7 @@
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null,
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true,
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false,
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global,
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globalThis,
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this,
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];
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this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
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@ -526,7 +483,7 @@
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[null, 2],
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[true, 3],
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[false, 4],
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[global, 5],
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[globalThis, 5],
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[this, 6],
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]);
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this._idPool = []; // unused ids that have been garbage collected
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@ -601,36 +558,4 @@
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};
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}
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}
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if (
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typeof module !== "undefined" &&
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global.require &&
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global.require.main === module &&
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global.process &&
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global.process.versions &&
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!global.process.versions.electron
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) {
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if (process.argv.length < 3) {
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console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
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process.exit(1);
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}
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const go = new Go();
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go.argv = process.argv.slice(2);
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go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
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go.exit = process.exit;
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WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
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process.on("exit", (code) => { // Node.js exits if no event handler is pending
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if (code === 0 && !go.exited) {
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// deadlock, make Go print error and stack traces
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go._pendingEvent = { id: 0 };
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go._resume();
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}
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});
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return go.run(result.instance);
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}).catch((err) => {
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console.error(err);
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process.exit(1);
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});
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}
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})();
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2
go.mod
2
go.mod
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@ -1,6 +1,6 @@
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module wasm-canvas-example
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go 1.17
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go 1.21.3
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require (
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github.com/llgcode/draw2d v0.0.0-20210904075650-80aa0a2a901d
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