1dbdc48a77
The BSD-style license that Go uses requires the license to be included with the source distribution; so add it as LICENSE.wasmexec (to avoid confusion with the other licenses in rclone) and note the location of the license in wasm_exec.js itself.
659 lines
19 KiB
JavaScript
659 lines
19 KiB
JavaScript
// 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.wasmexec file.
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"use strict";
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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 (!globalThis.fs) {
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let outputBuf = "";
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globalThis.fs = {
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constants: {
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O_WRONLY: -1,
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O_RDWR: -1,
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O_CREAT: -1,
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O_TRUNC: -1,
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O_APPEND: -1,
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O_EXCL: -1,
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}, // 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.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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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) {
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callback(enosys());
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},
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chown(path, uid, gid, callback) {
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callback(enosys());
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},
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close(fd, callback) {
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callback(enosys());
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},
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fchmod(fd, mode, callback) {
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callback(enosys());
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},
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fchown(fd, uid, gid, callback) {
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callback(enosys());
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},
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fstat(fd, callback) {
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callback(enosys());
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},
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fsync(fd, callback) {
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callback(null);
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},
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ftruncate(fd, length, callback) {
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callback(enosys());
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},
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lchown(path, uid, gid, callback) {
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callback(enosys());
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},
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link(path, link, callback) {
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callback(enosys());
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},
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lstat(path, callback) {
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callback(enosys());
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},
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mkdir(path, perm, callback) {
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callback(enosys());
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},
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open(path, flags, mode, callback) {
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callback(enosys());
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},
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read(fd, buffer, offset, length, position, callback) {
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callback(enosys());
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},
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readdir(path, callback) {
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callback(enosys());
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},
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readlink(path, callback) {
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callback(enosys());
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},
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rename(from, to, callback) {
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callback(enosys());
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},
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rmdir(path, callback) {
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callback(enosys());
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},
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stat(path, callback) {
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callback(enosys());
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},
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symlink(path, link, callback) {
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callback(enosys());
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},
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truncate(path, length, callback) {
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callback(enosys());
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},
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unlink(path, callback) {
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callback(enosys());
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},
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utimes(path, atime, mtime, callback) {
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callback(enosys());
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},
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};
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}
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if (!globalThis.process) {
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globalThis.process = {
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getuid() {
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return -1;
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},
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getgid() {
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return -1;
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},
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geteuid() {
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return -1;
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},
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getegid() {
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return -1;
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},
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getgroups() {
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throw enosys();
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},
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pid: -1,
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ppid: -1,
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umask() {
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throw enosys();
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},
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cwd() {
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throw enosys();
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},
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chdir() {
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throw enosys();
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},
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};
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}
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if (!globalThis.crypto) {
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throw new Error(
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"globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)",
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);
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}
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if (!globalThis.performance) {
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throw new Error(
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"globalThis.performance is not available, polyfill required (performance.now only)",
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);
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}
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if (!globalThis.TextEncoder) {
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throw new Error(
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"globalThis.TextEncoder is not available, polyfill required",
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);
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}
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if (!globalThis.TextDecoder) {
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throw new Error(
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"globalThis.TextDecoder is not available, polyfill required",
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);
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}
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const encoder = new TextEncoder("utf-8");
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const decoder = new TextDecoder("utf-8");
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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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this.exit = (code) => {
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if (code !== 0) {
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console.warn("exit code:", code);
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}
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};
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this._exitPromise = new Promise((resolve) => {
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this._resolveExitPromise = resolve;
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});
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this._pendingEvent = null;
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this._scheduledTimeouts = new Map();
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this._nextCallbackTimeoutID = 1;
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const setInt64 = (addr, v) => {
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this.mem.setUint32(addr + 0, v, true);
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this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), 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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return low + high * 4294967296;
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};
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const loadValue = (addr) => {
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const f = this.mem.getFloat64(addr, 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 = this.mem.getUint32(addr, true);
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return this._values[id];
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};
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const storeValue = (addr, v) => {
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const nanHead = 0x7FF80000;
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if (typeof v === "number" && v !== 0) {
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if (isNaN(v)) {
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 0, true);
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return;
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}
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this.mem.setFloat64(addr, v, true);
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return;
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}
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if (v === undefined) {
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this.mem.setFloat64(addr, 0, true);
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return;
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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 = 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 = 0;
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switch (typeof v) {
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case "object":
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if (v !== null) {
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typeFlag = 1;
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}
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break;
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case "string":
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typeFlag = 2;
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break;
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case "symbol":
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typeFlag = 3;
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break;
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case "function":
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typeFlag = 4;
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break;
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}
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this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
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this.mem.setUint32(addr, id, true);
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};
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const loadSlice = (addr) => {
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const array = getInt64(addr + 0);
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const len = getInt64(addr + 8);
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return new Uint8Array(this._inst.exports.mem.buffer, array, len);
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};
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const loadSliceOfValues = (addr) => {
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const array = getInt64(addr + 0);
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const len = getInt64(addr + 8);
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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 = (addr) => {
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const saddr = getInt64(addr + 0);
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const len = getInt64(addr + 8);
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return decoder.decode(
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new DataView(this._inst.exports.mem.buffer, saddr, len),
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);
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};
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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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// 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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// This changes the SP, thus we have to update the SP used by the imported function.
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// func wasmExit(code int32)
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"runtime.wasmExit": (sp) => {
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sp >>>= 0;
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const code = this.mem.getInt32(sp + 8, true);
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this.exited = true;
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delete this._inst;
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delete this._values;
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delete this._goRefCounts;
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delete this._ids;
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delete this._idPool;
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this.exit(code);
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},
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// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
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"runtime.wasmWrite": (sp) => {
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sp >>>= 0;
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const fd = getInt64(sp + 8);
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const p = getInt64(sp + 16);
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const n = this.mem.getInt32(sp + 24, true);
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fs.writeSync(
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fd,
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new Uint8Array(this._inst.exports.mem.buffer, p, n),
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);
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},
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// func resetMemoryDataView()
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"runtime.resetMemoryDataView": (sp) => {
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sp >>>= 0;
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this.mem = new DataView(this._inst.exports.mem.buffer);
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},
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// func nanotime1() int64
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"runtime.nanotime1": (sp) => {
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sp >>>= 0;
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setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
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},
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// func walltime() (sec int64, nsec int32)
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"runtime.walltime": (sp) => {
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sp >>>= 0;
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const msec = (new Date()).getTime();
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setInt64(sp + 8, msec / 1000);
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this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
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},
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// func scheduleTimeoutEvent(delay int64) int32
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"runtime.scheduleTimeoutEvent": (sp) => {
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sp >>>= 0;
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const id = this._nextCallbackTimeoutID;
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this._nextCallbackTimeoutID++;
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this._scheduledTimeouts.set(
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id,
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setTimeout(
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() => {
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this._resume();
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while (this._scheduledTimeouts.has(id)) {
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// for some reason Go failed to register the timeout event, log and try again
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// (temporary workaround for https://github.com/golang/go/issues/28975)
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console.warn("scheduleTimeoutEvent: missed timeout event");
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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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),
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);
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this.mem.setInt32(sp + 16, id, true);
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},
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// func clearTimeoutEvent(id int32)
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"runtime.clearTimeoutEvent": (sp) => {
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sp >>>= 0;
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const id = this.mem.getInt32(sp + 8, true);
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clearTimeout(this._scheduledTimeouts.get(id));
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this._scheduledTimeouts.delete(id);
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},
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// func getRandomData(r []byte)
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"runtime.getRandomData": (sp) => {
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sp >>>= 0;
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crypto.getRandomValues(loadSlice(sp + 8));
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},
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// func finalizeRef(v ref)
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"syscall/js.finalizeRef": (sp) => {
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sp >>>= 0;
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const id = this.mem.getUint32(sp + 8, 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": (sp) => {
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sp >>>= 0;
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storeValue(sp + 24, loadString(sp + 8));
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},
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// func valueGet(v ref, p string) ref
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"syscall/js.valueGet": (sp) => {
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sp >>>= 0;
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const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 32, result);
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},
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// func valueSet(v ref, p string, x ref)
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"syscall/js.valueSet": (sp) => {
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sp >>>= 0;
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Reflect.set(
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loadValue(sp + 8),
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loadString(sp + 16),
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loadValue(sp + 32),
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);
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},
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// func valueDelete(v ref, p string)
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"syscall/js.valueDelete": (sp) => {
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sp >>>= 0;
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Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
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},
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// func valueIndex(v ref, i int) ref
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"syscall/js.valueIndex": (sp) => {
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sp >>>= 0;
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storeValue(
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sp + 24,
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Reflect.get(loadValue(sp + 8), getInt64(sp + 16)),
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);
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},
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// valueSetIndex(v ref, i int, x ref)
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"syscall/js.valueSetIndex": (sp) => {
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sp >>>= 0;
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Reflect.set(
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loadValue(sp + 8),
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getInt64(sp + 16),
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loadValue(sp + 24),
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);
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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": (sp) => {
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sp >>>= 0;
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try {
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const v = loadValue(sp + 8);
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const m = Reflect.get(v, loadString(sp + 16));
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const args = loadSliceOfValues(sp + 32);
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const result = Reflect.apply(m, v, args);
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 56, result);
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this.mem.setUint8(sp + 64, 1);
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} catch (err) {
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 56, err);
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this.mem.setUint8(sp + 64, 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": (sp) => {
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sp >>>= 0;
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try {
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const v = loadValue(sp + 8);
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const args = loadSliceOfValues(sp + 16);
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const result = Reflect.apply(v, undefined, args);
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 40, result);
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this.mem.setUint8(sp + 48, 1);
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} catch (err) {
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 40, err);
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this.mem.setUint8(sp + 48, 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": (sp) => {
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sp >>>= 0;
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try {
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const v = loadValue(sp + 8);
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const args = loadSliceOfValues(sp + 16);
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const result = Reflect.construct(v, args);
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 40, result);
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this.mem.setUint8(sp + 48, 1);
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} catch (err) {
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 40, err);
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this.mem.setUint8(sp + 48, 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": (sp) => {
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sp >>>= 0;
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setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
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},
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// valuePrepareString(v ref) (ref, int)
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"syscall/js.valuePrepareString": (sp) => {
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sp >>>= 0;
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const str = encoder.encode(String(loadValue(sp + 8)));
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storeValue(sp + 16, str);
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setInt64(sp + 24, str.length);
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},
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// valueLoadString(v ref, b []byte)
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"syscall/js.valueLoadString": (sp) => {
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sp >>>= 0;
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const str = loadValue(sp + 8);
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loadSlice(sp + 16).set(str);
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},
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// func valueInstanceOf(v ref, t ref) bool
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"syscall/js.valueInstanceOf": (sp) => {
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sp >>>= 0;
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this.mem.setUint8(
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sp + 24,
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(loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0,
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);
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},
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// func copyBytesToGo(dst []byte, src ref) (int, bool)
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"syscall/js.copyBytesToGo": (sp) => {
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sp >>>= 0;
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const dst = loadSlice(sp + 8);
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const src = loadValue(sp + 32);
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if (
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!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)
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) {
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this.mem.setUint8(sp + 48, 0);
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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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setInt64(sp + 40, toCopy.length);
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this.mem.setUint8(sp + 48, 1);
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},
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// func copyBytesToJS(dst ref, src []byte) (int, bool)
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|
"syscall/js.copyBytesToJS": (sp) => {
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sp >>>= 0;
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const dst = loadValue(sp + 8);
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const src = loadSlice(sp + 16);
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if (
|
|
!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)
|
|
) {
|
|
this.mem.setUint8(sp + 48, 0);
|
|
return;
|
|
}
|
|
const toCopy = src.subarray(0, dst.length);
|
|
dst.set(toCopy);
|
|
setInt64(sp + 40, toCopy.length);
|
|
this.mem.setUint8(sp + 48, 1);
|
|
},
|
|
|
|
"debug": (value) => {
|
|
console.log(value);
|
|
},
|
|
},
|
|
};
|
|
}
|
|
|
|
async run(instance) {
|
|
if (!(instance instanceof WebAssembly.Instance)) {
|
|
throw new Error("Go.run: WebAssembly.Instance expected");
|
|
}
|
|
this._inst = instance;
|
|
this.mem = new DataView(this._inst.exports.mem.buffer);
|
|
this._values = [ // JS values that Go currently has references to, indexed by reference id
|
|
NaN,
|
|
0,
|
|
null,
|
|
true,
|
|
false,
|
|
globalThis,
|
|
this,
|
|
];
|
|
this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
|
|
this._ids = new Map([ // mapping from JS values to reference ids
|
|
[0, 1],
|
|
[null, 2],
|
|
[true, 3],
|
|
[false, 4],
|
|
[globalThis, 5],
|
|
[this, 6],
|
|
]);
|
|
this._idPool = []; // unused ids that have been garbage collected
|
|
this.exited = false; // whether the Go program has exited
|
|
|
|
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
|
|
let offset = 4096;
|
|
|
|
const strPtr = (str) => {
|
|
const ptr = offset;
|
|
const bytes = encoder.encode(str + "\0");
|
|
new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
|
|
offset += bytes.length;
|
|
if (offset % 8 !== 0) {
|
|
offset += 8 - (offset % 8);
|
|
}
|
|
return ptr;
|
|
};
|
|
|
|
const argc = this.argv.length;
|
|
|
|
const argvPtrs = [];
|
|
this.argv.forEach((arg) => {
|
|
argvPtrs.push(strPtr(arg));
|
|
});
|
|
argvPtrs.push(0);
|
|
|
|
const keys = Object.keys(this.env).sort();
|
|
keys.forEach((key) => {
|
|
argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
|
|
});
|
|
argvPtrs.push(0);
|
|
|
|
const argv = offset;
|
|
argvPtrs.forEach((ptr) => {
|
|
this.mem.setUint32(offset, ptr, true);
|
|
this.mem.setUint32(offset + 4, 0, true);
|
|
offset += 8;
|
|
});
|
|
|
|
// The linker guarantees global data starts from at least wasmMinDataAddr.
|
|
// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
|
|
const wasmMinDataAddr = 4096 + 8192;
|
|
if (offset >= wasmMinDataAddr) {
|
|
throw new Error(
|
|
"total length of command line and environment variables exceeds limit",
|
|
);
|
|
}
|
|
|
|
this._inst.exports.run(argc, argv);
|
|
if (this.exited) {
|
|
this._resolveExitPromise();
|
|
}
|
|
await this._exitPromise;
|
|
}
|
|
|
|
_resume() {
|
|
if (this.exited) {
|
|
throw new Error("Go program has already exited");
|
|
}
|
|
this._inst.exports.resume();
|
|
if (this.exited) {
|
|
this._resolveExitPromise();
|
|
}
|
|
}
|
|
|
|
_makeFuncWrapper(id) {
|
|
const go = this;
|
|
return function () {
|
|
const event = { id: id, this: this, args: arguments };
|
|
go._pendingEvent = event;
|
|
go._resume();
|
|
return event.result;
|
|
};
|
|
}
|
|
};
|
|
})();
|