4d2a6d2bbe
Browsers previously didn't support the WebAssembly i64 type, so we had to work around that limitation by converting the LLVM i64 type to something else. Some people used a pair of i32 values, but we used a pointer to a stack allocated i64. Now however, all major browsers and Node.js do support WebAssembly BigInt integration so that i64 values can be passed back and forth between WebAssembly and JavaScript easily. Therefore, I think the time has come to drop support for this workaround. For more information: https://v8.dev/features/wasm-bigint (note that TinyGo has used a slightly different way of passing i64 values between JS and Wasm). For information on browser support: https://webassembly.org/roadmap/
525 строки
15 КиБ
JavaScript
525 строки
15 КиБ
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 file.
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//
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// This file has been modified for use by the TinyGo compiler.
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(() => {
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// Map multiple JavaScript environments to a single common API,
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// preferring web standards over Node.js API.
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//
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// Environments considered:
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// - Browsers
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// - Node.js
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// - Electron
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// - Parcel
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if (typeof global !== "undefined") {
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// global already exists
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} else if (typeof window !== "undefined") {
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window.global = window;
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} else if (typeof self !== "undefined") {
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self.global = self;
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} else {
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throw new Error("cannot export Go (neither global, window nor self is defined)");
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}
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if (!global.require && typeof require !== "undefined") {
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global.require = require;
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}
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if (!global.fs && global.require) {
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global.fs = require("fs");
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}
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const enosys = () => {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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return err;
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};
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if (!global.fs) {
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let outputBuf = "";
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global.fs = {
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constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
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writeSync(fd, buf) {
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outputBuf += decoder.decode(buf);
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const nl = outputBuf.lastIndexOf("\n");
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if (nl != -1) {
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console.log(outputBuf.substr(0, nl));
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outputBuf = outputBuf.substr(nl + 1);
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}
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return buf.length;
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},
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write(fd, buf, offset, length, position, callback) {
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if (offset !== 0 || length !== buf.length || position !== null) {
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callback(enosys());
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return;
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}
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const n = this.writeSync(fd, buf);
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callback(null, n);
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},
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chmod(path, mode, callback) { callback(enosys()); },
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chown(path, uid, gid, callback) { callback(enosys()); },
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close(fd, callback) { callback(enosys()); },
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fchmod(fd, mode, callback) { callback(enosys()); },
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fchown(fd, uid, gid, callback) { callback(enosys()); },
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fstat(fd, callback) { callback(enosys()); },
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fsync(fd, callback) { callback(null); },
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ftruncate(fd, length, callback) { callback(enosys()); },
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lchown(path, uid, gid, callback) { callback(enosys()); },
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link(path, link, callback) { callback(enosys()); },
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lstat(path, callback) { callback(enosys()); },
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mkdir(path, perm, callback) { callback(enosys()); },
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open(path, flags, mode, callback) { callback(enosys()); },
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read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
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readdir(path, callback) { callback(enosys()); },
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readlink(path, callback) { callback(enosys()); },
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rename(from, to, callback) { callback(enosys()); },
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rmdir(path, callback) { callback(enosys()); },
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stat(path, callback) { callback(enosys()); },
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symlink(path, link, callback) { callback(enosys()); },
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truncate(path, length, callback) { callback(enosys()); },
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unlink(path, callback) { callback(enosys()); },
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utimes(path, atime, mtime, callback) { callback(enosys()); },
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};
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}
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if (!global.process) {
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global.process = {
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getuid() { return -1; },
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getgid() { return -1; },
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geteuid() { return -1; },
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getegid() { return -1; },
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getgroups() { throw enosys(); },
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pid: -1,
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ppid: -1,
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umask() { throw enosys(); },
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cwd() { throw enosys(); },
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chdir() { throw enosys(); },
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}
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}
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if (!global.crypto) {
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const nodeCrypto = require("crypto");
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global.crypto = {
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getRandomValues(b) {
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nodeCrypto.randomFillSync(b);
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},
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};
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}
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if (!global.performance) {
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global.performance = {
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now() {
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const [sec, nsec] = process.hrtime();
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return sec * 1000 + nsec / 1000000;
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},
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};
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}
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if (!global.TextEncoder) {
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global.TextEncoder = require("util").TextEncoder;
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}
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if (!global.TextDecoder) {
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global.TextDecoder = require("util").TextDecoder;
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}
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// End of polyfills for common API.
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const encoder = new TextEncoder("utf-8");
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const decoder = new TextDecoder("utf-8");
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let reinterpretBuf = new DataView(new ArrayBuffer(8));
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var logLine = [];
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global.Go = class {
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constructor() {
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this._callbackTimeouts = new Map();
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this._nextCallbackTimeoutID = 1;
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const mem = () => {
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// The buffer may change when requesting more memory.
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return new DataView(this._inst.exports.memory.buffer);
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}
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const unboxValue = (v_ref) => {
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reinterpretBuf.setBigInt64(0, v_ref, true);
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const f = reinterpretBuf.getFloat64(0, true);
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if (f === 0) {
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return undefined;
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}
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if (!isNaN(f)) {
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return f;
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}
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const id = v_ref & 0xffffffffn;
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return this._values[id];
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}
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const loadValue = (addr) => {
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let v_ref = mem().getBigUint64(addr, true);
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return unboxValue(v_ref);
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}
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const boxValue = (v) => {
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const nanHead = 0x7FF80000n;
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if (typeof v === "number") {
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if (isNaN(v)) {
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return nanHead << 32n;
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}
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if (v === 0) {
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return (nanHead << 32n) | 1n;
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}
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reinterpretBuf.setFloat64(0, v, true);
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return reinterpretBuf.getBigInt64(0, true);
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}
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switch (v) {
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case undefined:
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return 0n;
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case null:
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return (nanHead << 32n) | 2n;
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case true:
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return (nanHead << 32n) | 3n;
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case false:
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return (nanHead << 32n) | 4n;
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}
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let id = this._ids.get(v);
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if (id === undefined) {
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id = this._idPool.pop();
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if (id === undefined) {
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id = BigInt(this._values.length);
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}
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this._values[id] = v;
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this._goRefCounts[id] = 0;
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this._ids.set(v, id);
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}
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this._goRefCounts[id]++;
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let typeFlag = 1n;
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switch (typeof v) {
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case "string":
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typeFlag = 2n;
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break;
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case "symbol":
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typeFlag = 3n;
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break;
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case "function":
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typeFlag = 4n;
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break;
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}
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return id | ((nanHead | typeFlag) << 32n);
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}
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const storeValue = (addr, v) => {
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let v_ref = boxValue(v);
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mem().setBigUint64(addr, v_ref, true);
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}
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const loadSlice = (array, len, cap) => {
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return new Uint8Array(this._inst.exports.memory.buffer, array, len);
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}
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const loadSliceOfValues = (array, len, cap) => {
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const a = new Array(len);
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for (let i = 0; i < len; i++) {
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a[i] = loadValue(array + i * 8);
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}
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return a;
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}
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const loadString = (ptr, len) => {
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return decoder.decode(new DataView(this._inst.exports.memory.buffer, ptr, len));
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}
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const timeOrigin = Date.now() - performance.now();
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this.importObject = {
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wasi_snapshot_preview1: {
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// https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#fd_write
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fd_write: function(fd, iovs_ptr, iovs_len, nwritten_ptr) {
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let nwritten = 0;
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if (fd == 1) {
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for (let iovs_i=0; iovs_i<iovs_len;iovs_i++) {
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let iov_ptr = iovs_ptr+iovs_i*8; // assuming wasm32
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let ptr = mem().getUint32(iov_ptr + 0, true);
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let len = mem().getUint32(iov_ptr + 4, true);
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nwritten += len;
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for (let i=0; i<len; i++) {
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let c = mem().getUint8(ptr+i);
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if (c == 13) { // CR
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// ignore
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} else if (c == 10) { // LF
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// write line
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let line = decoder.decode(new Uint8Array(logLine));
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logLine = [];
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console.log(line);
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} else {
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logLine.push(c);
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}
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}
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}
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} else {
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console.error('invalid file descriptor:', fd);
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}
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mem().setUint32(nwritten_ptr, nwritten, true);
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return 0;
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},
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fd_close: () => 0, // dummy
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fd_fdstat_get: () => 0, // dummy
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fd_seek: () => 0, // dummy
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"proc_exit": (code) => {
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if (global.process) {
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// Node.js
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process.exit(code);
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} else {
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// Can't exit in a browser.
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throw 'trying to exit with code ' + code;
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}
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},
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random_get: (bufPtr, bufLen) => {
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crypto.getRandomValues(loadSlice(bufPtr, bufLen));
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return 0;
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},
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},
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env: {
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// func ticks() float64
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"runtime.ticks": () => {
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return timeOrigin + performance.now();
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},
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// func sleepTicks(timeout float64)
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"runtime.sleepTicks": (timeout) => {
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// Do not sleep, only reactivate scheduler after the given timeout.
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setTimeout(this._inst.exports.go_scheduler, timeout);
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},
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// func finalizeRef(v ref)
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"syscall/js.finalizeRef": (v_ref) => {
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// Note: TinyGo does not support finalizers so this should never be
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// called.
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console.error('syscall/js.finalizeRef not implemented');
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},
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// func stringVal(value string) ref
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"syscall/js.stringVal": (value_ptr, value_len) => {
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const s = loadString(value_ptr, value_len);
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return boxValue(s);
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},
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// func valueGet(v ref, p string) ref
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"syscall/js.valueGet": (v_ref, p_ptr, p_len) => {
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let prop = loadString(p_ptr, p_len);
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let v = unboxValue(v_ref);
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let result = Reflect.get(v, prop);
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return boxValue(result);
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},
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// func valueSet(v ref, p string, x ref)
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"syscall/js.valueSet": (v_ref, p_ptr, p_len, x_ref) => {
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const v = unboxValue(v_ref);
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const p = loadString(p_ptr, p_len);
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const x = unboxValue(x_ref);
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Reflect.set(v, p, x);
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},
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// func valueDelete(v ref, p string)
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"syscall/js.valueDelete": (v_ref, p_ptr, p_len) => {
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const v = unboxValue(v_ref);
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const p = loadString(p_ptr, p_len);
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Reflect.deleteProperty(v, p);
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},
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// func valueIndex(v ref, i int) ref
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"syscall/js.valueIndex": (v_ref, i) => {
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return boxValue(Reflect.get(unboxValue(v_ref), i));
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},
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// valueSetIndex(v ref, i int, x ref)
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"syscall/js.valueSetIndex": (v_ref, i, x_ref) => {
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Reflect.set(unboxValue(v_ref), i, unboxValue(x_ref));
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},
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// func valueCall(v ref, m string, args []ref) (ref, bool)
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"syscall/js.valueCall": (ret_addr, v_ref, m_ptr, m_len, args_ptr, args_len, args_cap) => {
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const v = unboxValue(v_ref);
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const name = loadString(m_ptr, m_len);
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const args = loadSliceOfValues(args_ptr, args_len, args_cap);
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try {
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const m = Reflect.get(v, name);
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storeValue(ret_addr, Reflect.apply(m, v, args));
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mem().setUint8(ret_addr + 8, 1);
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} catch (err) {
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storeValue(ret_addr, err);
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mem().setUint8(ret_addr + 8, 0);
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}
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},
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// func valueInvoke(v ref, args []ref) (ref, bool)
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"syscall/js.valueInvoke": (ret_addr, v_ref, args_ptr, args_len, args_cap) => {
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try {
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const v = unboxValue(v_ref);
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const args = loadSliceOfValues(args_ptr, args_len, args_cap);
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storeValue(ret_addr, Reflect.apply(v, undefined, args));
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mem().setUint8(ret_addr + 8, 1);
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} catch (err) {
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storeValue(ret_addr, err);
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mem().setUint8(ret_addr + 8, 0);
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}
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},
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// func valueNew(v ref, args []ref) (ref, bool)
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"syscall/js.valueNew": (ret_addr, v_ref, args_ptr, args_len, args_cap) => {
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const v = unboxValue(v_ref);
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const args = loadSliceOfValues(args_ptr, args_len, args_cap);
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try {
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storeValue(ret_addr, Reflect.construct(v, args));
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mem().setUint8(ret_addr + 8, 1);
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} catch (err) {
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storeValue(ret_addr, err);
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mem().setUint8(ret_addr+ 8, 0);
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}
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},
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// func valueLength(v ref) int
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"syscall/js.valueLength": (v_ref) => {
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return unboxValue(v_ref).length;
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},
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// valuePrepareString(v ref) (ref, int)
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"syscall/js.valuePrepareString": (ret_addr, v_ref) => {
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const s = String(unboxValue(v_ref));
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const str = encoder.encode(s);
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storeValue(ret_addr, str);
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mem().setInt32(ret_addr + 8, str.length, true);
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},
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// valueLoadString(v ref, b []byte)
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"syscall/js.valueLoadString": (v_ref, slice_ptr, slice_len, slice_cap) => {
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const str = unboxValue(v_ref);
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loadSlice(slice_ptr, slice_len, slice_cap).set(str);
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},
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// func valueInstanceOf(v ref, t ref) bool
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"syscall/js.valueInstanceOf": (v_ref, t_ref) => {
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return unboxValue(v_ref) instanceof unboxValue(t_ref);
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},
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// func copyBytesToGo(dst []byte, src ref) (int, bool)
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"syscall/js.copyBytesToGo": (ret_addr, dest_addr, dest_len, dest_cap, src_ref) => {
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let num_bytes_copied_addr = ret_addr;
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let returned_status_addr = ret_addr + 4; // Address of returned boolean status variable
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const dst = loadSlice(dest_addr, dest_len);
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const src = unboxValue(src_ref);
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if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
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mem().setUint8(returned_status_addr, 0); // Return "not ok" status
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return;
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}
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const toCopy = src.subarray(0, dst.length);
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dst.set(toCopy);
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mem().setUint32(num_bytes_copied_addr, toCopy.length, true);
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mem().setUint8(returned_status_addr, 1); // Return "ok" status
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},
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// copyBytesToJS(dst ref, src []byte) (int, bool)
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// Originally copied from upstream Go project, then modified:
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// https://github.com/golang/go/blob/3f995c3f3b43033013013e6c7ccc93a9b1411ca9/misc/wasm/wasm_exec.js#L404-L416
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"syscall/js.copyBytesToJS": (ret_addr, dst_ref, src_addr, src_len, src_cap) => {
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let num_bytes_copied_addr = ret_addr;
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let returned_status_addr = ret_addr + 4; // Address of returned boolean status variable
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const dst = unboxValue(dst_ref);
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const src = loadSlice(src_addr, src_len);
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if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
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mem().setUint8(returned_status_addr, 0); // Return "not ok" status
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return;
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}
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const toCopy = src.subarray(0, dst.length);
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dst.set(toCopy);
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mem().setUint32(num_bytes_copied_addr, toCopy.length, true);
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mem().setUint8(returned_status_addr, 1); // Return "ok" status
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},
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}
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};
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}
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async run(instance) {
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this._inst = instance;
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this._values = [ // JS values that Go currently has references to, indexed by reference id
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NaN,
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0,
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null,
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true,
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false,
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global,
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this,
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];
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this._goRefCounts = []; // number of references that Go has to a JS value, indexed by reference id
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this._ids = new Map(); // mapping from JS values to reference ids
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this._idPool = []; // unused ids that have been garbage collected
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this.exited = false; // whether the Go program has exited
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const mem = new DataView(this._inst.exports.memory.buffer)
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while (true) {
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const callbackPromise = new Promise((resolve) => {
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this._resolveCallbackPromise = () => {
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if (this.exited) {
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throw new Error("bad callback: Go program has already exited");
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}
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setTimeout(resolve, 0); // make sure it is asynchronous
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};
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});
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this._inst.exports._start();
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if (this.exited) {
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break;
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}
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await callbackPromise;
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}
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}
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_resume() {
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if (this.exited) {
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throw new Error("Go program has already exited");
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}
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|
this._inst.exports.resume();
|
|
if (this.exited) {
|
|
this._resolveExitPromise();
|
|
}
|
|
}
|
|
|
|
_makeFuncWrapper(id) {
|
|
const go = this;
|
|
return function () {
|
|
const event = { id: id, this: this, args: arguments };
|
|
go._pendingEvent = event;
|
|
go._resume();
|
|
return event.result;
|
|
};
|
|
}
|
|
}
|
|
|
|
if (
|
|
global.require &&
|
|
global.require.main === module &&
|
|
global.process &&
|
|
global.process.versions &&
|
|
!global.process.versions.electron
|
|
) {
|
|
if (process.argv.length != 3) {
|
|
console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
|
|
process.exit(1);
|
|
}
|
|
|
|
const go = new Go();
|
|
WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
|
|
return go.run(result.instance);
|
|
}).catch((err) => {
|
|
console.error(err);
|
|
process.exit(1);
|
|
});
|
|
}
|
|
})();
|