560 lines
16 KiB
JavaScript
560 lines
16 KiB
JavaScript
// wasm_exec.js from tinygo
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// Copyright 2018 The Go Authors. All rights reserved.
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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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//
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// This file has been modified for use by the TinyGo compiler.
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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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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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global.fs = require("node:fs");
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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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let outputBuf = "";
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global.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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}
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return buf.length;
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},
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write(fd, buf, offset, length, position, callback) {
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if (offset !== 0 || length !== buf.length || position !== null) {
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callback(enosys());
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return;
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}
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const n = this.writeSync(fd, buf);
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callback(null, n);
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},
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chmod(path, mode, callback) { callback(enosys()); },
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chown(path, uid, gid, callback) { callback(enosys()); },
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close(fd, callback) { callback(enosys()); },
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fchmod(fd, mode, callback) { callback(enosys()); },
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fchown(fd, uid, gid, callback) { callback(enosys()); },
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fstat(fd, callback) { callback(enosys()); },
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fsync(fd, callback) { callback(null); },
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ftruncate(fd, length, callback) { callback(enosys()); },
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lchown(path, uid, gid, callback) { callback(enosys()); },
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link(path, link, callback) { callback(enosys()); },
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lstat(path, callback) { callback(enosys()); },
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mkdir(path, perm, callback) { callback(enosys()); },
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open(path, flags, mode, callback) { callback(enosys()); },
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read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
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readdir(path, callback) { callback(enosys()); },
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readlink(path, callback) { callback(enosys()); },
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rename(from, to, callback) { callback(enosys()); },
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rmdir(path, callback) { callback(enosys()); },
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stat(path, callback) { callback(enosys()); },
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symlink(path, link, callback) { callback(enosys()); },
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truncate(path, length, callback) { callback(enosys()); },
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unlink(path, callback) { callback(enosys()); },
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utimes(path, atime, mtime, callback) { callback(enosys()); },
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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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getuid() { return -1; },
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getgid() { return -1; },
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geteuid() { return -1; },
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getegid() { return -1; },
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getgroups() { throw enosys(); },
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pid: -1,
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ppid: -1,
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umask() { throw enosys(); },
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cwd() { throw enosys(); },
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chdir() { throw enosys(); },
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}
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}
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if (!global.crypto) {
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const nodeCrypto = require("node: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.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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}
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if (!global.TextEncoder) {
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global.TextEncoder = require("node:util").TextEncoder;
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}
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if (!global.TextDecoder) {
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global.TextDecoder = require("node:util").TextDecoder;
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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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let reinterpretBuf = new DataView(new ArrayBuffer(8));
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var logLine = [];
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global.Go = class {
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constructor() {
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this._callbackTimeouts = new Map();
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this._nextCallbackTimeoutID = 1;
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const mem = () => {
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// The buffer may change when requesting more memory.
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return new DataView(this._inst.exports.memory.buffer);
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}
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const unboxValue = (v_ref) => {
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reinterpretBuf.setBigInt64(0, v_ref, true);
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const f = reinterpretBuf.getFloat64(0, true);
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if (f === 0) {
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return undefined;
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}
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if (!isNaN(f)) {
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return f;
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}
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const id = v_ref & 0xffffffffn;
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return this._values[id];
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}
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const loadValue = (addr) => {
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let v_ref = mem().getBigUint64(addr, true);
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return unboxValue(v_ref);
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}
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const boxValue = (v) => {
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const nanHead = 0x7FF80000n;
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if (typeof v === "number") {
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if (isNaN(v)) {
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return nanHead << 32n;
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}
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if (v === 0) {
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return (nanHead << 32n) | 1n;
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}
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reinterpretBuf.setFloat64(0, v, true);
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return reinterpretBuf.getBigInt64(0, true);
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}
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switch (v) {
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case undefined:
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return 0n;
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case null:
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return (nanHead << 32n) | 2n;
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case true:
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return (nanHead << 32n) | 3n;
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case false:
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return (nanHead << 32n) | 4n;
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}
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let id = this._ids.get(v);
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if (id === undefined) {
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id = this._idPool.pop();
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if (id === undefined) {
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id = BigInt(this._values.length);
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}
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this._values[id] = v;
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this._goRefCounts[id] = 0;
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this._ids.set(v, id);
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}
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this._goRefCounts[id]++;
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let typeFlag = 1n;
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switch (typeof v) {
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case "string":
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typeFlag = 2n;
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break;
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case "symbol":
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typeFlag = 3n;
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break;
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case "function":
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typeFlag = 4n;
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break;
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}
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return id | ((nanHead | typeFlag) << 32n);
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}
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const storeValue = (addr, v) => {
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let v_ref = boxValue(v);
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mem().setBigUint64(addr, v_ref, true);
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}
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const loadSlice = (array, len, cap) => {
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return new Uint8Array(this._inst.exports.memory.buffer, array, len);
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}
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const loadSliceOfValues = (array, len, cap) => {
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const a = new Array(len);
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for (let i = 0; i < len; i++) {
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a[i] = loadValue(array + i * 8);
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}
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return a;
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}
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const loadString = (ptr, len) => {
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return decoder.decode(new DataView(this._inst.exports.memory.buffer, ptr, len));
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}
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const timeOrigin = Date.now() - performance.now();
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this.importObject = {
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wasi_snapshot_preview1: {
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// https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#fd_write
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fd_write: function(fd, iovs_ptr, iovs_len, nwritten_ptr) {
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let nwritten = 0;
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if (fd == 1) {
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for (let iovs_i=0; iovs_i<iovs_len;iovs_i++) {
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let iov_ptr = iovs_ptr+iovs_i*8; // assuming wasm32
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let ptr = mem().getUint32(iov_ptr + 0, true);
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let len = mem().getUint32(iov_ptr + 4, true);
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nwritten += len;
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for (let i=0; i<len; i++) {
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let c = mem().getUint8(ptr+i);
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if (c == 13) { // CR
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// ignore
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} else if (c == 10) { // LF
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// write line
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let line = decoder.decode(new Uint8Array(logLine));
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logLine = [];
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console.log(line);
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} else {
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logLine.push(c);
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}
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}
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}
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} else {
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console.error('invalid file descriptor:', fd);
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}
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mem().setUint32(nwritten_ptr, nwritten, true);
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return 0;
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},
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fd_close: () => 0, // dummy
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fd_fdstat_get: () => 0, // dummy
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fd_seek: () => 0, // dummy
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"proc_exit": (code) => {
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if (global.process) {
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// Node.js
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process.exit(code);
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} else {
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// Can't exit in a browser.
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throw 'trying to exit with code ' + code;
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}
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},
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random_get: (bufPtr, bufLen) => {
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crypto.getRandomValues(loadSlice(bufPtr, bufLen));
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return 0;
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},
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},
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gojs: {
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// func ticks() float64
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"runtime.ticks": () => {
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return timeOrigin + performance.now();
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},
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// func sleepTicks(timeout float64)
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"runtime.sleepTicks": (timeout) => {
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// Do not sleep, only reactivate scheduler after the given timeout.
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setTimeout(this._inst.exports.go_scheduler, timeout);
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},
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// func finalizeRef(v ref)
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"syscall/js.finalizeRef": (v_ref) => {
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const id = mem().getUint32(unboxValue(v_ref), true);
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this._goRefCounts[id]--;
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if (this._goRefCounts[id] === 0) {
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const v = this._values[id];
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this._values[id] = null;
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this._ids.delete(v);
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this._idPool.push(id);
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}
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},
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// func stringVal(value string) ref
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"syscall/js.stringVal": (value_ptr, value_len) => {
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const s = loadString(value_ptr, value_len);
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return boxValue(s);
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},
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// func valueGet(v ref, p string) ref
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"syscall/js.valueGet": (v_ref, p_ptr, p_len) => {
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let prop = loadString(p_ptr, p_len);
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let v = unboxValue(v_ref);
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let result = Reflect.get(v, prop);
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return boxValue(result);
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},
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// func valueSet(v ref, p string, x ref)
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"syscall/js.valueSet": (v_ref, p_ptr, p_len, x_ref) => {
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const v = unboxValue(v_ref);
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const p = loadString(p_ptr, p_len);
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const x = unboxValue(x_ref);
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Reflect.set(v, p, x);
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},
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// func valueDelete(v ref, p string)
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"syscall/js.valueDelete": (v_ref, p_ptr, p_len) => {
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const v = unboxValue(v_ref);
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const p = loadString(p_ptr, p_len);
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Reflect.deleteProperty(v, p);
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},
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// func valueIndex(v ref, i int) ref
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"syscall/js.valueIndex": (v_ref, i) => {
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return boxValue(Reflect.get(unboxValue(v_ref), i));
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},
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// valueSetIndex(v ref, i int, x ref)
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"syscall/js.valueSetIndex": (v_ref, i, x_ref) => {
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Reflect.set(unboxValue(v_ref), i, unboxValue(x_ref));
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},
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// func valueCall(v ref, m string, args []ref) (ref, bool)
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"syscall/js.valueCall": (ret_addr, v_ref, m_ptr, m_len, args_ptr, args_len, args_cap) => {
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const v = unboxValue(v_ref);
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const name = loadString(m_ptr, m_len);
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const args = loadSliceOfValues(args_ptr, args_len, args_cap);
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try {
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const m = Reflect.get(v, name);
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storeValue(ret_addr, Reflect.apply(m, v, args));
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mem().setUint8(ret_addr + 8, 1);
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} catch (err) {
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storeValue(ret_addr, err);
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mem().setUint8(ret_addr + 8, 0);
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}
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},
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// func valueInvoke(v ref, args []ref) (ref, bool)
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"syscall/js.valueInvoke": (ret_addr, v_ref, args_ptr, args_len, args_cap) => {
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try {
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const v = unboxValue(v_ref);
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const args = loadSliceOfValues(args_ptr, args_len, args_cap);
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storeValue(ret_addr, Reflect.apply(v, undefined, args));
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mem().setUint8(ret_addr + 8, 1);
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} catch (err) {
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storeValue(ret_addr, err);
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mem().setUint8(ret_addr + 8, 0);
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}
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},
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// func valueNew(v ref, args []ref) (ref, bool)
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"syscall/js.valueNew": (ret_addr, v_ref, args_ptr, args_len, args_cap) => {
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const v = unboxValue(v_ref);
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const args = loadSliceOfValues(args_ptr, args_len, args_cap);
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try {
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storeValue(ret_addr, Reflect.construct(v, args));
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mem().setUint8(ret_addr + 8, 1);
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} catch (err) {
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storeValue(ret_addr, err);
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mem().setUint8(ret_addr+ 8, 0);
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}
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},
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// func valueLength(v ref) int
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"syscall/js.valueLength": (v_ref) => {
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return unboxValue(v_ref).length;
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},
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// valuePrepareString(v ref) (ref, int)
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"syscall/js.valuePrepareString": (ret_addr, v_ref) => {
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const s = String(unboxValue(v_ref));
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const str = encoder.encode(s);
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storeValue(ret_addr, str);
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mem().setInt32(ret_addr + 8, str.length, true);
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},
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// valueLoadString(v ref, b []byte)
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"syscall/js.valueLoadString": (v_ref, slice_ptr, slice_len, slice_cap) => {
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const str = unboxValue(v_ref);
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loadSlice(slice_ptr, slice_len, slice_cap).set(str);
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},
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// func valueInstanceOf(v ref, t ref) bool
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"syscall/js.valueInstanceOf": (v_ref, t_ref) => {
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return unboxValue(v_ref) instanceof unboxValue(t_ref);
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},
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// func copyBytesToGo(dst []byte, src ref) (int, bool)
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"syscall/js.copyBytesToGo": (ret_addr, dest_addr, dest_len, dest_cap, src_ref) => {
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let num_bytes_copied_addr = ret_addr;
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let returned_status_addr = ret_addr + 4; // Address of returned boolean status variable
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const dst = loadSlice(dest_addr, dest_len);
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const src = unboxValue(src_ref);
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if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
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mem().setUint8(returned_status_addr, 0); // Return "not ok" status
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return;
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}
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const toCopy = src.subarray(0, dst.length);
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dst.set(toCopy);
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mem().setUint32(num_bytes_copied_addr, toCopy.length, true);
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mem().setUint8(returned_status_addr, 1); // Return "ok" status
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},
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// copyBytesToJS(dst ref, src []byte) (int, bool)
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// Originally copied from upstream Go project, then modified:
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// https://github.com/golang/go/blob/3f995c3f3b43033013013e6c7ccc93a9b1411ca9/misc/wasm/wasm_exec.js#L404-L416
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"syscall/js.copyBytesToJS": (ret_addr, dst_ref, src_addr, src_len, src_cap) => {
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let num_bytes_copied_addr = ret_addr;
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let returned_status_addr = ret_addr + 4; // Address of returned boolean status variable
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const dst = unboxValue(dst_ref);
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const src = loadSlice(src_addr, src_len);
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if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
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mem().setUint8(returned_status_addr, 0); // Return "not ok" status
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return;
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}
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const toCopy = src.subarray(0, dst.length);
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dst.set(toCopy);
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mem().setUint32(num_bytes_copied_addr, toCopy.length, true);
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mem().setUint8(returned_status_addr, 1); // Return "ok" status
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},
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}
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};
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// Go 1.20 uses 'env'. Go 1.21 uses 'gojs'.
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// For compatibility, we use both as long as Go 1.20 is supported.
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this.importObject.env = this.importObject.gojs;
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}
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async run(instance) {
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this._inst = instance;
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this._values = [ // JS values that Go currently has references to, indexed by reference id
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NaN,
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0,
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null,
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true,
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false,
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global,
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this,
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];
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this._goRefCounts = []; // number of references that Go has to a JS value, indexed by reference id
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this._ids = new Map(); // mapping from JS values to reference ids
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this._idPool = []; // unused ids that have been garbage collected
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this.exited = false; // whether the Go program has exited
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while (true) {
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const callbackPromise = new Promise((resolve) => {
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this._resolveCallbackPromise = () => {
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if (this.exited) {
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throw new Error("bad callback: Go program has already exited");
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}
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setTimeout(resolve, 0); // make sure it is asynchronous
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};
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});
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this._inst.exports._start();
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if (this.exited) {
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break;
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}
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await callbackPromise;
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}
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}
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_resume() {
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if (this.exited) {
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throw new Error("Go program has already exited");
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}
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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;
|
|
};
|
|
}
|
|
}
|
|
|
|
if (
|
|
global.require &&
|
|
global.require.main === module &&
|
|
global.process &&
|
|
global.process.versions &&
|
|
!global.process.versions.electron
|
|
) {
|
|
if (process.argv.length != 3) {
|
|
console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
|
|
process.exit(1);
|
|
}
|
|
|
|
const go = new Go();
|
|
WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
|
|
return go.run(result.instance);
|
|
}).catch((err) => {
|
|
console.error(err);
|
|
process.exit(1);
|
|
});
|
|
}
|
|
})();
|
|
|
|
// wasm setup code
|
|
export default function init (path) {
|
|
return new Promise ((res) => {
|
|
const go = new Go();
|
|
var wasm;
|
|
|
|
if ('instantiateStreaming' in WebAssembly) {
|
|
WebAssembly.instantiateStreaming(fetch(path), go.importObject).then(function (obj) {
|
|
wasm = obj.instance;
|
|
go.run(wasm);
|
|
res()
|
|
})
|
|
} else {
|
|
fetch(path).then(resp =>
|
|
resp.arrayBuffer()
|
|
).then(bytes =>
|
|
WebAssembly.instantiate(bytes, go.importObject).then(function (obj) {
|
|
wasm = obj.instance;
|
|
go.run(wasm);
|
|
res()
|
|
})
|
|
)
|
|
}
|
|
})
|
|
} |