[6a3a178] | 1 | // Copyright 2018 The Go Authors. All rights reserved.
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| 2 | // Use of this source code is governed by a BSD-style
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| 3 | // license that can be found in the LICENSE file.
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| 4 |
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| 5 | (() => {
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| 6 | // Map multiple JavaScript environments to a single common API,
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| 7 | // preferring web standards over Node.js API.
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| 8 | //
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| 9 | // Environments considered:
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| 10 | // - Browsers
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| 11 | // - Node.js
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| 12 | // - Electron
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| 13 | // - Parcel
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| 14 | // - Webpack
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| 15 |
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| 16 | if (typeof global !== "undefined") {
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| 17 | // global already exists
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| 18 | } else if (typeof window !== "undefined") {
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| 19 | window.global = window;
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| 20 | } else if (typeof self !== "undefined") {
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| 21 | self.global = self;
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| 22 | } else {
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| 23 | throw new Error("cannot export Go (neither global, window nor self is defined)");
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| 24 | }
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| 25 |
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| 26 | if (!global.require && typeof require !== "undefined") {
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| 27 | global.require = require;
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| 28 | }
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| 29 |
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| 30 | if (!global.fs && global.require) {
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| 31 | const fs = require("fs");
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| 32 | if (typeof fs === "object" && fs !== null && Object.keys(fs).length !== 0) {
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| 33 |
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| 34 | global.fs = Object.assign({}, fs, {
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| 35 | // Hack around a Unicode bug in node: https://github.com/nodejs/node/issues/24550
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| 36 | write(fd, buf, offset, length, position, callback) {
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| 37 | if (offset === 0 && length === buf.length && position === null) {
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| 38 | if (fd === process.stdout.fd) {
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| 39 | try {
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| 40 | process.stdout.write(buf, err => err ? callback(err, 0, null) : callback(null, length, buf));
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| 41 | } catch (err) {
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| 42 | callback(err, 0, null);
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| 43 | }
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| 44 | return;
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| 45 | }
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| 46 | if (fd === process.stderr.fd) {
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| 47 | try {
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| 48 | process.stderr.write(buf, err => err ? callback(err, 0, null) : callback(null, length, buf));
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| 49 | } catch (err) {
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| 50 | callback(err, 0, null);
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| 51 | }
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| 52 | return;
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| 53 | }
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| 54 | }
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| 55 | fs.write(fd, buf, offset, length, position, callback);
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| 56 | },
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| 57 | });
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| 58 |
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| 59 | }
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| 60 | }
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| 61 |
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| 62 | const enosys = () => {
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| 63 | const err = new Error("not implemented");
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| 64 | err.code = "ENOSYS";
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| 65 | return err;
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| 66 | };
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| 67 |
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| 68 | if (!global.fs) {
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| 69 | let outputBuf = "";
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| 70 | global.fs = {
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| 71 | constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
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| 72 | writeSync(fd, buf) {
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| 73 | outputBuf += decoder.decode(buf);
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| 74 | const nl = outputBuf.lastIndexOf("\n");
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| 75 | if (nl != -1) {
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| 76 | console.log(outputBuf.substr(0, nl));
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| 77 | outputBuf = outputBuf.substr(nl + 1);
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| 78 | }
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| 79 | return buf.length;
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| 80 | },
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| 81 | write(fd, buf, offset, length, position, callback) {
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| 82 | if (offset !== 0 || length !== buf.length || position !== null) {
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| 83 | callback(enosys());
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| 84 | return;
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| 85 | }
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| 86 | const n = this.writeSync(fd, buf);
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| 87 | callback(null, n);
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| 88 | },
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| 89 | chmod(path, mode, callback) { callback(enosys()); },
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| 90 | chown(path, uid, gid, callback) { callback(enosys()); },
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| 91 | close(fd, callback) { callback(enosys()); },
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| 92 | fchmod(fd, mode, callback) { callback(enosys()); },
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| 93 | fchown(fd, uid, gid, callback) { callback(enosys()); },
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| 94 | fstat(fd, callback) { callback(enosys()); },
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| 95 | fsync(fd, callback) { callback(null); },
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| 96 | ftruncate(fd, length, callback) { callback(enosys()); },
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| 97 | lchown(path, uid, gid, callback) { callback(enosys()); },
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| 98 | link(path, link, callback) { callback(enosys()); },
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| 99 | lstat(path, callback) { callback(enosys()); },
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| 100 | mkdir(path, perm, callback) { callback(enosys()); },
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| 101 | open(path, flags, mode, callback) { callback(enosys()); },
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| 102 | read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
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| 103 | readdir(path, callback) { callback(enosys()); },
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| 104 | readlink(path, callback) { callback(enosys()); },
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| 105 | rename(from, to, callback) { callback(enosys()); },
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| 106 | rmdir(path, callback) { callback(enosys()); },
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| 107 | stat(path, callback) { callback(enosys()); },
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| 108 | symlink(path, link, callback) { callback(enosys()); },
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| 109 | truncate(path, length, callback) { callback(enosys()); },
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| 110 | unlink(path, callback) { callback(enosys()); },
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| 111 | utimes(path, atime, mtime, callback) { callback(enosys()); },
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| 112 | };
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| 113 | }
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| 114 |
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| 115 | if (!global.process) {
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| 116 | global.process = {
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| 117 | getuid() { return -1; },
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| 118 | getgid() { return -1; },
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| 119 | geteuid() { return -1; },
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| 120 | getegid() { return -1; },
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| 121 | getgroups() { throw enosys(); },
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| 122 | pid: -1,
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| 123 | ppid: -1,
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| 124 | umask() { throw enosys(); },
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| 125 | cwd() { throw enosys(); },
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| 126 | chdir() { throw enosys(); },
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| 127 | }
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| 128 | }
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| 129 |
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| 130 | if (!global.crypto && global.require) {
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| 131 | const nodeCrypto = require("crypto");
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| 132 | global.crypto = {
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| 133 | getRandomValues(b) {
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| 134 | nodeCrypto.randomFillSync(b);
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| 135 | },
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| 136 | };
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| 137 | }
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| 138 | if (!global.crypto) {
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| 139 | throw new Error("global.crypto is not available, polyfill required (getRandomValues only)");
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| 140 | }
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| 141 |
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| 142 | if (!global.performance) {
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| 143 | global.performance = {
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| 144 | now() {
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| 145 | const [sec, nsec] = process.hrtime();
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| 146 | return sec * 1000 + nsec / 1000000;
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| 147 | },
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| 148 | };
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| 149 | }
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| 150 |
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| 151 | if (!global.TextEncoder && global.require) {
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| 152 | global.TextEncoder = require("util").TextEncoder;
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| 153 | }
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| 154 | if (!global.TextEncoder) {
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| 155 | throw new Error("global.TextEncoder is not available, polyfill required");
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| 156 | }
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| 157 |
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| 158 | if (!global.TextDecoder && global.require) {
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| 159 | global.TextDecoder = require("util").TextDecoder;
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| 160 | }
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| 161 | if (!global.TextDecoder) {
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| 162 | throw new Error("global.TextDecoder is not available, polyfill required");
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| 163 | }
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| 164 |
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| 165 | // End of polyfills for common API.
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| 166 |
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| 167 | const encoder = new TextEncoder("utf-8");
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| 168 | const decoder = new TextDecoder("utf-8");
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| 169 |
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| 170 | global.Go = class {
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| 171 | constructor() {
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| 172 | this.argv = ["js"];
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| 173 | this.env = {};
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| 174 | this.exit = (code) => {
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| 175 | if (code !== 0) {
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| 176 | console.warn("exit code:", code);
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| 177 | }
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| 178 | };
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| 179 | this._exitPromise = new Promise((resolve) => {
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| 180 | this._resolveExitPromise = resolve;
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| 181 | });
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| 182 | this._pendingEvent = null;
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| 183 | this._scheduledTimeouts = new Map();
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| 184 | this._nextCallbackTimeoutID = 1;
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| 185 |
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| 186 | const setInt64 = (addr, v) => {
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| 187 | this.mem.setUint32(addr + 0, v, true);
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| 188 | this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
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| 189 | }
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| 190 |
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| 191 | const getInt64 = (addr) => {
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| 192 | const low = this.mem.getUint32(addr + 0, true);
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| 193 | const high = this.mem.getInt32(addr + 4, true);
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| 194 | return low + high * 4294967296;
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| 195 | }
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| 196 |
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| 197 | const loadValue = (addr) => {
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| 198 | const f = this.mem.getFloat64(addr, true);
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| 199 | if (f === 0) {
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| 200 | return undefined;
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| 201 | }
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| 202 | if (!isNaN(f)) {
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| 203 | return f;
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| 204 | }
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| 205 |
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| 206 | const id = this.mem.getUint32(addr, true);
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| 207 | return this._values[id];
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| 208 | }
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| 209 |
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| 210 | const storeValue = (addr, v) => {
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| 211 | const nanHead = 0x7FF80000;
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| 212 |
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| 213 | if (typeof v === "number" && v !== 0) {
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| 214 | if (isNaN(v)) {
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| 215 | this.mem.setUint32(addr + 4, nanHead, true);
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| 216 | this.mem.setUint32(addr, 0, true);
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| 217 | return;
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| 218 | }
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| 219 | this.mem.setFloat64(addr, v, true);
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| 220 | return;
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| 221 | }
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| 222 |
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| 223 | if (v === undefined) {
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| 224 | this.mem.setFloat64(addr, 0, true);
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| 225 | return;
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| 226 | }
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| 227 |
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| 228 | let id = this._ids.get(v);
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| 229 | if (id === undefined) {
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| 230 | id = this._idPool.pop();
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| 231 | if (id === undefined) {
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| 232 | id = this._values.length;
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| 233 | }
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| 234 | this._values[id] = v;
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| 235 | this._goRefCounts[id] = 0;
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| 236 | this._ids.set(v, id);
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| 237 | }
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| 238 | this._goRefCounts[id]++;
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| 239 | let typeFlag = 0;
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| 240 | switch (typeof v) {
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| 241 | case "object":
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| 242 | if (v !== null) {
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| 243 | typeFlag = 1;
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| 244 | }
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| 245 | break;
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| 246 | case "string":
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| 247 | typeFlag = 2;
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| 248 | break;
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| 249 | case "symbol":
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| 250 | typeFlag = 3;
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| 251 | break;
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| 252 | case "function":
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| 253 | typeFlag = 4;
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| 254 | break;
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| 255 | }
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| 256 | this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
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| 257 | this.mem.setUint32(addr, id, true);
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| 258 | }
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| 259 |
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| 260 | const loadSlice = (addr) => {
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| 261 | const array = getInt64(addr + 0);
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| 262 | const len = getInt64(addr + 8);
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| 263 | return new Uint8Array(this._inst.exports.mem.buffer, array, len);
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| 264 | }
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| 265 |
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| 266 | const loadSliceOfValues = (addr) => {
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| 267 | const array = getInt64(addr + 0);
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| 268 | const len = getInt64(addr + 8);
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| 269 | const a = new Array(len);
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| 270 | for (let i = 0; i < len; i++) {
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| 271 | a[i] = loadValue(array + i * 8);
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| 272 | }
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| 273 | return a;
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| 274 | }
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| 275 |
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| 276 | const loadString = (addr) => {
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| 277 | const saddr = getInt64(addr + 0);
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| 278 | const len = getInt64(addr + 8);
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| 279 | return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
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| 280 | }
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| 281 |
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| 282 | const timeOrigin = Date.now() - performance.now();
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| 283 | this.importObject = {
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| 284 | go: {
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| 285 | // 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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| 286 | // may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
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| 287 | // function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
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| 288 | // This changes the SP, thus we have to update the SP used by the imported function.
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| 289 |
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| 290 | // func wasmExit(code int32)
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| 291 | "runtime.wasmExit": (sp) => {
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| 292 | sp >>>= 0;
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| 293 | const code = this.mem.getInt32(sp + 8, true);
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| 294 | this.exited = true;
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| 295 | delete this._inst;
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| 296 | delete this._values;
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| 297 | delete this._goRefCounts;
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| 298 | delete this._ids;
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| 299 | delete this._idPool;
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| 300 | this.exit(code);
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| 301 | },
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| 302 |
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| 303 | // func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
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| 304 | "runtime.wasmWrite": (sp) => {
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| 305 | sp >>>= 0;
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| 306 | const fd = getInt64(sp + 8);
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| 307 | const p = getInt64(sp + 16);
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| 308 | const n = this.mem.getInt32(sp + 24, true);
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| 309 | fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
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| 310 | },
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| 311 |
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| 312 | // func resetMemoryDataView()
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| 313 | "runtime.resetMemoryDataView": (sp) => {
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| 314 | sp >>>= 0;
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| 315 | this.mem = new DataView(this._inst.exports.mem.buffer);
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| 316 | },
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| 317 |
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| 318 | // func nanotime1() int64
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| 319 | "runtime.nanotime1": (sp) => {
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| 320 | sp >>>= 0;
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| 321 | setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
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| 322 | },
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| 323 |
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| 324 | // func walltime() (sec int64, nsec int32)
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| 325 | "runtime.walltime": (sp) => {
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| 326 | sp >>>= 0;
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| 327 | const msec = (new Date).getTime();
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| 328 | setInt64(sp + 8, msec / 1000);
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| 329 | this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
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| 330 | },
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| 331 |
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| 332 | // func scheduleTimeoutEvent(delay int64) int32
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| 333 | "runtime.scheduleTimeoutEvent": (sp) => {
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| 334 | sp >>>= 0;
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| 335 | const id = this._nextCallbackTimeoutID;
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| 336 | this._nextCallbackTimeoutID++;
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| 337 | this._scheduledTimeouts.set(id, setTimeout(
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| 338 | () => {
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| 339 | this._resume();
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| 340 | while (this._scheduledTimeouts.has(id)) {
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| 341 | // for some reason Go failed to register the timeout event, log and try again
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| 342 | // (temporary workaround for https://github.com/golang/go/issues/28975)
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| 343 | console.warn("scheduleTimeoutEvent: missed timeout event");
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| 344 | this._resume();
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| 345 | }
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| 346 | },
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| 347 | getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
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| 348 | ));
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| 349 | this.mem.setInt32(sp + 16, id, true);
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| 350 | },
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| 351 |
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| 352 | // func clearTimeoutEvent(id int32)
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| 353 | "runtime.clearTimeoutEvent": (sp) => {
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| 354 | sp >>>= 0;
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| 355 | const id = this.mem.getInt32(sp + 8, true);
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| 356 | clearTimeout(this._scheduledTimeouts.get(id));
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| 357 | this._scheduledTimeouts.delete(id);
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| 358 | },
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| 359 |
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| 360 | // func getRandomData(r []byte)
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| 361 | "runtime.getRandomData": (sp) => {
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| 362 | sp >>>= 0;
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| 363 | crypto.getRandomValues(loadSlice(sp + 8));
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| 364 | },
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| 365 |
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| 366 | // func finalizeRef(v ref)
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| 367 | "syscall/js.finalizeRef": (sp) => {
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| 368 | sp >>>= 0;
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| 369 | const id = this.mem.getUint32(sp + 8, true);
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| 370 | this._goRefCounts[id]--;
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| 371 | if (this._goRefCounts[id] === 0) {
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| 372 | const v = this._values[id];
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| 373 | this._values[id] = null;
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| 374 | this._ids.delete(v);
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| 375 | this._idPool.push(id);
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| 376 | }
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| 377 | },
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| 378 |
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| 379 | // func stringVal(value string) ref
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| 380 | "syscall/js.stringVal": (sp) => {
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| 381 | sp >>>= 0;
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| 382 | storeValue(sp + 24, loadString(sp + 8));
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| 383 | },
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| 384 |
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| 385 | // func valueGet(v ref, p string) ref
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| 386 | "syscall/js.valueGet": (sp) => {
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| 387 | sp >>>= 0;
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| 388 | const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
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| 389 | sp = this._inst.exports.getsp() >>> 0; // see comment above
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| 390 | storeValue(sp + 32, result);
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| 391 | },
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| 392 |
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| 393 | // func valueSet(v ref, p string, x ref)
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| 394 | "syscall/js.valueSet": (sp) => {
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| 395 | sp >>>= 0;
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| 396 | Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
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| 397 | },
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| 398 |
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| 399 | // func valueDelete(v ref, p string)
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| 400 | "syscall/js.valueDelete": (sp) => {
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| 401 | sp >>>= 0;
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| 402 | Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
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| 403 | },
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| 404 |
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| 405 | // func valueIndex(v ref, i int) ref
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| 406 | "syscall/js.valueIndex": (sp) => {
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| 407 | sp >>>= 0;
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| 408 | storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
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| 409 | },
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| 410 |
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| 411 | // valueSetIndex(v ref, i int, x ref)
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| 412 | "syscall/js.valueSetIndex": (sp) => {
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| 413 | sp >>>= 0;
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| 414 | Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
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| 415 | },
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| 416 |
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| 417 | // func valueCall(v ref, m string, args []ref) (ref, bool)
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| 418 | "syscall/js.valueCall": (sp) => {
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| 419 | sp >>>= 0;
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| 420 | try {
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| 421 | const v = loadValue(sp + 8);
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| 422 | const m = Reflect.get(v, loadString(sp + 16));
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| 423 | const args = loadSliceOfValues(sp + 32);
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| 424 | const result = Reflect.apply(m, v, args);
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| 425 | sp = this._inst.exports.getsp() >>> 0; // see comment above
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| 426 | storeValue(sp + 56, result);
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| 427 | this.mem.setUint8(sp + 64, 1);
|
---|
| 428 | } catch (err) {
|
---|
| 429 | sp = this._inst.exports.getsp() >>> 0; // see comment above
|
---|
| 430 | storeValue(sp + 56, err);
|
---|
| 431 | this.mem.setUint8(sp + 64, 0);
|
---|
| 432 | }
|
---|
| 433 | },
|
---|
| 434 |
|
---|
| 435 | // func valueInvoke(v ref, args []ref) (ref, bool)
|
---|
| 436 | "syscall/js.valueInvoke": (sp) => {
|
---|
| 437 | sp >>>= 0;
|
---|
| 438 | try {
|
---|
| 439 | const v = loadValue(sp + 8);
|
---|
| 440 | const args = loadSliceOfValues(sp + 16);
|
---|
| 441 | const result = Reflect.apply(v, undefined, args);
|
---|
| 442 | sp = this._inst.exports.getsp() >>> 0; // see comment above
|
---|
| 443 | storeValue(sp + 40, result);
|
---|
| 444 | this.mem.setUint8(sp + 48, 1);
|
---|
| 445 | } catch (err) {
|
---|
| 446 | sp = this._inst.exports.getsp() >>> 0; // see comment above
|
---|
| 447 | storeValue(sp + 40, err);
|
---|
| 448 | this.mem.setUint8(sp + 48, 0);
|
---|
| 449 | }
|
---|
| 450 | },
|
---|
| 451 |
|
---|
| 452 | // func valueNew(v ref, args []ref) (ref, bool)
|
---|
| 453 | "syscall/js.valueNew": (sp) => {
|
---|
| 454 | sp >>>= 0;
|
---|
| 455 | try {
|
---|
| 456 | const v = loadValue(sp + 8);
|
---|
| 457 | const args = loadSliceOfValues(sp + 16);
|
---|
| 458 | const result = Reflect.construct(v, args);
|
---|
| 459 | sp = this._inst.exports.getsp() >>> 0; // see comment above
|
---|
| 460 | storeValue(sp + 40, result);
|
---|
| 461 | this.mem.setUint8(sp + 48, 1);
|
---|
| 462 | } catch (err) {
|
---|
| 463 | sp = this._inst.exports.getsp() >>> 0; // see comment above
|
---|
| 464 | storeValue(sp + 40, err);
|
---|
| 465 | this.mem.setUint8(sp + 48, 0);
|
---|
| 466 | }
|
---|
| 467 | },
|
---|
| 468 |
|
---|
| 469 | // func valueLength(v ref) int
|
---|
| 470 | "syscall/js.valueLength": (sp) => {
|
---|
| 471 | sp >>>= 0;
|
---|
| 472 | setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
|
---|
| 473 | },
|
---|
| 474 |
|
---|
| 475 | // valuePrepareString(v ref) (ref, int)
|
---|
| 476 | "syscall/js.valuePrepareString": (sp) => {
|
---|
| 477 | sp >>>= 0;
|
---|
| 478 | const str = encoder.encode(String(loadValue(sp + 8)));
|
---|
| 479 | storeValue(sp + 16, str);
|
---|
| 480 | setInt64(sp + 24, str.length);
|
---|
| 481 | },
|
---|
| 482 |
|
---|
| 483 | // valueLoadString(v ref, b []byte)
|
---|
| 484 | "syscall/js.valueLoadString": (sp) => {
|
---|
| 485 | sp >>>= 0;
|
---|
| 486 | const str = loadValue(sp + 8);
|
---|
| 487 | loadSlice(sp + 16).set(str);
|
---|
| 488 | },
|
---|
| 489 |
|
---|
| 490 | // func valueInstanceOf(v ref, t ref) bool
|
---|
| 491 | "syscall/js.valueInstanceOf": (sp) => {
|
---|
| 492 | sp >>>= 0;
|
---|
| 493 | this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
|
---|
| 494 | },
|
---|
| 495 |
|
---|
| 496 | // func copyBytesToGo(dst []byte, src ref) (int, bool)
|
---|
| 497 | "syscall/js.copyBytesToGo": (sp) => {
|
---|
| 498 | sp >>>= 0;
|
---|
| 499 | const dst = loadSlice(sp + 8);
|
---|
| 500 | const src = loadValue(sp + 32);
|
---|
| 501 | if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
|
---|
| 502 | this.mem.setUint8(sp + 48, 0);
|
---|
| 503 | return;
|
---|
| 504 | }
|
---|
| 505 | const toCopy = src.subarray(0, dst.length);
|
---|
| 506 | dst.set(toCopy);
|
---|
| 507 | setInt64(sp + 40, toCopy.length);
|
---|
| 508 | this.mem.setUint8(sp + 48, 1);
|
---|
| 509 | },
|
---|
| 510 |
|
---|
| 511 | // func copyBytesToJS(dst ref, src []byte) (int, bool)
|
---|
| 512 | "syscall/js.copyBytesToJS": (sp) => {
|
---|
| 513 | sp >>>= 0;
|
---|
| 514 | const dst = loadValue(sp + 8);
|
---|
| 515 | const src = loadSlice(sp + 16);
|
---|
| 516 | if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
|
---|
| 517 | this.mem.setUint8(sp + 48, 0);
|
---|
| 518 | return;
|
---|
| 519 | }
|
---|
| 520 | const toCopy = src.subarray(0, dst.length);
|
---|
| 521 | dst.set(toCopy);
|
---|
| 522 | setInt64(sp + 40, toCopy.length);
|
---|
| 523 | this.mem.setUint8(sp + 48, 1);
|
---|
| 524 | },
|
---|
| 525 |
|
---|
| 526 | "debug": (value) => {
|
---|
| 527 | console.log(value);
|
---|
| 528 | },
|
---|
| 529 | }
|
---|
| 530 | };
|
---|
| 531 | }
|
---|
| 532 |
|
---|
| 533 | async run(instance) {
|
---|
| 534 | if (!(instance instanceof WebAssembly.Instance)) {
|
---|
| 535 | throw new Error("Go.run: WebAssembly.Instance expected");
|
---|
| 536 | }
|
---|
| 537 | this._inst = instance;
|
---|
| 538 | this.mem = new DataView(this._inst.exports.mem.buffer);
|
---|
| 539 | this._values = [ // JS values that Go currently has references to, indexed by reference id
|
---|
| 540 | NaN,
|
---|
| 541 | 0,
|
---|
| 542 | null,
|
---|
| 543 | true,
|
---|
| 544 | false,
|
---|
| 545 | global,
|
---|
| 546 | this,
|
---|
| 547 | ];
|
---|
| 548 | this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
|
---|
| 549 | this._ids = new Map([ // mapping from JS values to reference ids
|
---|
| 550 | [0, 1],
|
---|
| 551 | [null, 2],
|
---|
| 552 | [true, 3],
|
---|
| 553 | [false, 4],
|
---|
| 554 | [global, 5],
|
---|
| 555 | [this, 6],
|
---|
| 556 | ]);
|
---|
| 557 | this._idPool = []; // unused ids that have been garbage collected
|
---|
| 558 | this.exited = false; // whether the Go program has exited
|
---|
| 559 |
|
---|
| 560 | // Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
|
---|
| 561 | let offset = 4096;
|
---|
| 562 |
|
---|
| 563 | const strPtr = (str) => {
|
---|
| 564 | const ptr = offset;
|
---|
| 565 | const bytes = encoder.encode(str + "\0");
|
---|
| 566 | new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
|
---|
| 567 | offset += bytes.length;
|
---|
| 568 | if (offset % 8 !== 0) {
|
---|
| 569 | offset += 8 - (offset % 8);
|
---|
| 570 | }
|
---|
| 571 | return ptr;
|
---|
| 572 | };
|
---|
| 573 |
|
---|
| 574 | const argc = this.argv.length;
|
---|
| 575 |
|
---|
| 576 | const argvPtrs = [];
|
---|
| 577 | this.argv.forEach((arg) => {
|
---|
| 578 | argvPtrs.push(strPtr(arg));
|
---|
| 579 | });
|
---|
| 580 | argvPtrs.push(0);
|
---|
| 581 |
|
---|
| 582 | const keys = Object.keys(this.env).sort();
|
---|
| 583 | keys.forEach((key) => {
|
---|
| 584 | argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
|
---|
| 585 | });
|
---|
| 586 | argvPtrs.push(0);
|
---|
| 587 |
|
---|
| 588 | const argv = offset;
|
---|
| 589 | argvPtrs.forEach((ptr) => {
|
---|
| 590 | this.mem.setUint32(offset, ptr, true);
|
---|
| 591 | this.mem.setUint32(offset + 4, 0, true);
|
---|
| 592 | offset += 8;
|
---|
| 593 | });
|
---|
| 594 |
|
---|
| 595 | this._inst.exports.run(argc, argv);
|
---|
| 596 | if (this.exited) {
|
---|
| 597 | this._resolveExitPromise();
|
---|
| 598 | }
|
---|
| 599 | await this._exitPromise;
|
---|
| 600 | }
|
---|
| 601 |
|
---|
| 602 | _resume() {
|
---|
| 603 | if (this.exited) {
|
---|
| 604 | throw new Error("Go program has already exited");
|
---|
| 605 | }
|
---|
| 606 | this._inst.exports.resume();
|
---|
| 607 | if (this.exited) {
|
---|
| 608 | this._resolveExitPromise();
|
---|
| 609 | }
|
---|
| 610 | }
|
---|
| 611 |
|
---|
| 612 | _makeFuncWrapper(id) {
|
---|
| 613 | const go = this;
|
---|
| 614 | return function () {
|
---|
| 615 | const event = { id: id, this: this, args: arguments };
|
---|
| 616 | go._pendingEvent = event;
|
---|
| 617 | go._resume();
|
---|
| 618 | return event.result;
|
---|
| 619 | };
|
---|
| 620 | }
|
---|
| 621 | }
|
---|
| 622 |
|
---|
| 623 | if (
|
---|
| 624 | typeof module !== "undefined" &&
|
---|
| 625 | global.require &&
|
---|
| 626 | global.require.main === module &&
|
---|
| 627 | global.process &&
|
---|
| 628 | global.process.versions &&
|
---|
| 629 | !global.process.versions.electron
|
---|
| 630 | ) {
|
---|
| 631 | if (process.argv.length < 3) {
|
---|
| 632 | console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
|
---|
| 633 | process.exit(1);
|
---|
| 634 | }
|
---|
| 635 |
|
---|
| 636 | const go = new Go();
|
---|
| 637 | go.argv = process.argv.slice(2);
|
---|
| 638 | go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
|
---|
| 639 | go.exit = process.exit;
|
---|
| 640 | WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
|
---|
| 641 | process.on("exit", (code) => { // Node.js exits if no event handler is pending
|
---|
| 642 | if (code === 0 && !go.exited) {
|
---|
| 643 | // deadlock, make Go print error and stack traces
|
---|
| 644 | go._pendingEvent = { id: 0 };
|
---|
| 645 | go._resume();
|
---|
| 646 | }
|
---|
| 647 | });
|
---|
| 648 | return go.run(result.instance);
|
---|
| 649 | }).catch((err) => {
|
---|
| 650 | console.error(err);
|
---|
| 651 | process.exit(1);
|
---|
| 652 | });
|
---|
| 653 | }
|
---|
| 654 | })();
|
---|