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575 lines
17 KiB
575 lines
17 KiB
// 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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"use strict"; |
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|
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(() => { |
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const enosys = () => { |
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const err = new Error("not implemented"); |
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err.code = "ENOSYS"; |
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return err; |
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}; |
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|
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if (!globalThis.fs) { |
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let outputBuf = ""; |
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globalThis.fs = { |
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constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1, O_DIRECTORY: -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.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) { 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 (!globalThis.process) { |
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globalThis.process = { |
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getuid() { return -1; }, |
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getgid() { return -1; }, |
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geteuid() { return -1; }, |
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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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|
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if (!globalThis.path) { |
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globalThis.path = { |
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resolve(...pathSegments) { |
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return pathSegments.join("/"); |
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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("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)"); |
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} |
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if (!globalThis.performance) { |
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throw new Error("globalThis.performance is not available, polyfill required (performance.now only)"); |
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} |
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if (!globalThis.TextEncoder) { |
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throw new Error("globalThis.TextEncoder is not available, polyfill required"); |
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} |
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if (!globalThis.TextDecoder) { |
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throw new Error("globalThis.TextDecoder is not available, polyfill required"); |
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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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|
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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 setInt32 = (addr, v) => { |
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this.mem.setUint32(addr + 0, v, true); |
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} |
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const getInt64 = (addr) => { |
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const low = this.mem.getUint32(addr + 0, true); |
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const high = this.mem.getInt32(addr + 4, true); |
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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(new DataView(this._inst.exports.mem.buffer, saddr, len)); |
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} |
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const testCallExport = (a, b) => { |
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this._inst.exports.testExport0(); |
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return this._inst.exports.testExport(a, b); |
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} |
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const timeOrigin = Date.now() - performance.now(); |
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this.importObject = { |
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_gotest: { |
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add: (a, b) => a + b, |
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callExport: testCallExport, |
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}, |
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gojs: { |
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// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters) |
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// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported |
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// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function). |
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// 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(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n)); |
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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(id, 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), |
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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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|
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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(loadValue(sp + 8), loadString(sp + 16), 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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|
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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(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16))); |
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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(loadValue(sp + 8), getInt64(sp + 16), 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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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(sp + 24, (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 (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) { |
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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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|
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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)) { |
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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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|
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"debug": (value) => { |
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console.log(value); |
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}, |
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} |
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}; |
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} |
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|
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async run(instance) { |
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if (!(instance instanceof WebAssembly.Instance)) { |
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throw new Error("Go.run: WebAssembly.Instance expected"); |
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} |
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this._inst = instance; |
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this.mem = new DataView(this._inst.exports.mem.buffer); |
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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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globalThis, |
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this, |
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]; |
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this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id |
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this._ids = new Map([ // mapping from JS values to reference ids |
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[0, 1], |
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[null, 2], |
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[true, 3], |
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[false, 4], |
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[globalThis, 5], |
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[this, 6], |
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]); |
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this._idPool = []; // unused ids that have been garbage collected |
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this.exited = false; // whether the Go program has exited |
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|
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// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory. |
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let offset = 4096; |
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|
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const strPtr = (str) => { |
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const ptr = offset; |
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const bytes = encoder.encode(str + "\0"); |
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new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes); |
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offset += bytes.length; |
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if (offset % 8 !== 0) { |
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offset += 8 - (offset % 8); |
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} |
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return ptr; |
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}; |
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|
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const argc = this.argv.length; |
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|
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const argvPtrs = []; |
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this.argv.forEach((arg) => { |
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argvPtrs.push(strPtr(arg)); |
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}); |
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argvPtrs.push(0); |
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|
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const keys = Object.keys(this.env).sort(); |
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keys.forEach((key) => { |
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argvPtrs.push(strPtr(`${key}=${this.env[key]}`)); |
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}); |
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argvPtrs.push(0); |
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|
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const argv = offset; |
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argvPtrs.forEach((ptr) => { |
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this.mem.setUint32(offset, ptr, true); |
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this.mem.setUint32(offset + 4, 0, true); |
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offset += 8; |
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}); |
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|
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// The linker guarantees global data starts from at least wasmMinDataAddr. |
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// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr. |
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const wasmMinDataAddr = 4096 + 8192; |
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if (offset >= wasmMinDataAddr) { |
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throw new Error("total length of command line and environment variables exceeds limit"); |
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} |
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|
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this._inst.exports.run(argc, argv); |
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if (this.exited) { |
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this._resolveExitPromise(); |
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} |
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await this._exitPromise; |
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} |
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|
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_resume() { |
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if (this.exited) { |
|
throw new Error("Go program has already exited"); |
|
} |
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this._inst.exports.resume(); |
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if (this.exited) { |
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this._resolveExitPromise(); |
|
} |
|
} |
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|
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_makeFuncWrapper(id) { |
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const go = this; |
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return function () { |
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const event = { id: id, this: this, args: arguments }; |
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go._pendingEvent = event; |
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go._resume(); |
|
return event.result; |
|
}; |
|
} |
|
} |
|
})();
|
|
|