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+ | + | // Copyright 2018 The Go Authors. All rights reserved. | +
| + | // Use of this source code is governed by a BSD-style | +
| + | // license that can be found in the LICENSE file. | +
| + | + | +
| + | (() => { | +
| + | if (typeof global !== "undefined") { | +
| + | // global already exists | +
| + | } else if (typeof window !== "undefined") { | +
| + | window.global = window; | +
| + | } else if (typeof self !== "undefined") { | +
| + | self.global = self; | +
| + | } else { | +
| + | throw new Error("cannot export Go (neither global, window nor self is defined)"); | +
| + | } | +
| + | + | +
| + | // Map web browser API and Node.js API to a single common API (preferring web standards over Node.js API). | +
| + | const isNodeJS = global.process && global.process.title === "node"; | +
| + | if (isNodeJS) { | +
| + | global.require = require; | +
| + | global.fs = require("fs"); | +
| + | + | +
| + | const nodeCrypto = require("crypto"); | +
| + | global.crypto = { | +
| + | getRandomValues(b) { | +
| + | nodeCrypto.randomFillSync(b); | +
| + | }, | +
| + | }; | +
| + | + | +
| + | global.performance = { | +
| + | now() { | +
| + | const [sec, nsec] = process.hrtime(); | +
| + | return sec * 1000 + nsec / 1000000; | +
| + | }, | +
| + | }; | +
| + | + | +
| + | const util = require("util"); | +
| + | global.TextEncoder = util.TextEncoder; | +
| + | global.TextDecoder = util.TextDecoder; | +
| + | } else { | +
| + | let outputBuf = ""; | +
| + | global.fs = { | +
| + | constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused | +
| + | writeSync(fd, buf) { | +
| + | outputBuf += decoder.decode(buf); | +
| + | const nl = outputBuf.lastIndexOf("\n"); | +
| + | if (nl != -1) { | +
| + | console.log(outputBuf.substr(0, nl)); | +
| + | outputBuf = outputBuf.substr(nl + 1); | +
| + | } | +
| + | return buf.length; | +
| + | }, | +
| + | write(fd, buf, offset, length, position, callback) { | +
| + | if (offset !== 0 || length !== buf.length || position !== null) { | +
| + | throw new Error("not implemented"); | +
| + | } | +
| + | const n = this.writeSync(fd, buf); | +
| + | callback(null, n); | +
| + | }, | +
| + | open(path, flags, mode, callback) { | +
| + | const err = new Error("not implemented"); | +
| + | err.code = "ENOSYS"; | +
| + | callback(err); | +
| + | }, | +
| + | fsync(fd, callback) { | +
| + | callback(null); | +
| + | }, | +
| + | }; | +
| + | } | +
| + | + | +
| + | const encoder = new TextEncoder("utf-8"); | +
| + | const decoder = new TextDecoder("utf-8"); | +
| + | + | +
| + | global.Go = class { | +
| + | constructor() { | +
| + | this.argv = ["js"]; | +
| + | this.env = {}; | +
| + | this.exit = (code) => { | +
| + | if (code !== 0) { | +
| + | console.warn("exit code:", code); | +
| + | } | +
| + | }; | +
| + | this._exitPromise = new Promise((resolve) => { | +
| + | this._resolveExitPromise = resolve; | +
| + | }); | +
| + | this._pendingCallback = null; | +
| + | this._callbackTimeouts = new Map(); | +
| + | this._nextCallbackTimeoutID = 1; | +
| + | + | +
| + | const mem = () => { | +
| + | // The buffer may change when requesting more memory. | +
| + | return new DataView(this._inst.exports.mem.buffer); | +
| + | } | +
| + | + | +
| + | const setInt64 = (addr, v) => { | +
| + | mem().setUint32(addr + 0, v, true); | +
| + | mem().setUint32(addr + 4, Math.floor(v / 4294967296), true); | +
| + | } | +
| + | + | +
| + | const getInt64 = (addr) => { | +
| + | const low = mem().getUint32(addr + 0, true); | +
| + | const high = mem().getInt32(addr + 4, true); | +
| + | return low + high * 4294967296; | +
| + | } | +
| + | + | +
| + | const loadValue = (addr) => { | +
| + | const f = mem().getFloat64(addr, true); | +
| + | if (f === 0) { | +
| + | return undefined; | +
| + | } | +
| + | if (!isNaN(f)) { | +
| + | return f; | +
| + | } | +
| + | + | +
| + | const id = mem().getUint32(addr, true); | +
| + | return this._values[id]; | +
| + | } | +
| + | + | +
| + | const storeValue = (addr, v) => { | +
| + | const nanHead = 0x7FF80000; | +
| + | + | +
| + | if (typeof v === "number") { | +
| + | if (isNaN(v)) { | +
| + | mem().setUint32(addr + 4, nanHead, true); | +
| + | mem().setUint32(addr, 0, true); | +
| + | return; | +
| + | } | +
| + | if (v === 0) { | +
| + | mem().setUint32(addr + 4, nanHead, true); | +
| + | mem().setUint32(addr, 1, true); | +
| + | return; | +
| + | } | +
| + | mem().setFloat64(addr, v, true); | +
| + | return; | +
| + | } | +
| + | + | +
| + | switch (v) { | +
| + | case undefined: | +
| + | mem().setFloat64(addr, 0, true); | +
| + | return; | +
| + | case null: | +
| + | mem().setUint32(addr + 4, nanHead, true); | +
| + | mem().setUint32(addr, 2, true); | +
| + | return; | +
| + | case true: | +
| + | mem().setUint32(addr + 4, nanHead, true); | +
| + | mem().setUint32(addr, 3, true); | +
| + | return; | +
| + | case false: | +
| + | mem().setUint32(addr + 4, nanHead, true); | +
| + | mem().setUint32(addr, 4, true); | +
| + | return; | +
| + | } | +
| + | + | +
| + | let ref = this._refs.get(v); | +
| + | if (ref === undefined) { | +
| + | ref = this._values.length; | +
| + | this._values.push(v); | +
| + | this._refs.set(v, ref); | +
| + | } | +
| + | let typeFlag = 0; | +
| + | switch (typeof v) { | +
| + | case "string": | +
| + | typeFlag = 1; | +
| + | break; | +
| + | case "symbol": | +
| + | typeFlag = 2; | +
| + | break; | +
| + | case "function": | +
| + | typeFlag = 3; | +
| + | break; | +
| + | } | +
| + | mem().setUint32(addr + 4, nanHead | typeFlag, true); | +
| + | mem().setUint32(addr, ref, true); | +
| + | } | +
| + | + | +
| + | const loadSlice = (addr) => { | +
| + | const array = getInt64(addr + 0); | +
| + | const len = getInt64(addr + 8); | +
| + | return new Uint8Array(this._inst.exports.mem.buffer, array, len); | +
| + | } | +
| + | + | +
| + | const loadSliceOfValues = (addr) => { | +
| + | const array = getInt64(addr + 0); | +
| + | const len = getInt64(addr + 8); | +
| + | const a = new Array(len); | +
| + | for (let i = 0; i < len; i++) { | +
| + | a[i] = loadValue(array + i * 8); | +
| + | } | +
| + | return a; | +
| + | } | +
| + | + | +
| + | const loadString = (addr) => { | +
| + | const saddr = getInt64(addr + 0); | +
| + | const len = getInt64(addr + 8); | +
| + | return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len)); | +
| + | } | +
| + | + | +
| + | const timeOrigin = Date.now() - performance.now(); | +
| + | this.importObject = { | +
| + | go: { | +
| + | // Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters) | +
| + | // may trigger a synchronous callback to Go. This makes Go code get executed in the middle of the imported | +
| + | // function. A goroutine can switch to a new stack if the current stack is too small (see morestack function). | +
| + | // This changes the SP, thus we have to update the SP used by the imported function. | +
| + | + | +
| + | // func wasmExit(code int32) | +
| + | "runtime.wasmExit": (sp) => { | +
| + | const code = mem().getInt32(sp + 8, true); | +
| + | this.exited = true; | +
| + | delete this._inst; | +
| + | delete this._values; | +
| + | delete this._refs; | +
| + | this.exit(code); | +
| + | }, | +
| + | + | +
| + | // func wasmWrite(fd uintptr, p unsafe.Pointer, n int32) | +
| + | "runtime.wasmWrite": (sp) => { | +
| + | const fd = getInt64(sp + 8); | +
| + | const p = getInt64(sp + 16); | +
| + | const n = mem().getInt32(sp + 24, true); | +
| + | fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n)); | +
| + | }, | +
| + | + | +
| + | // func nanotime() int64 | +
| + | "runtime.nanotime": (sp) => { | +
| + | setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000); | +
| + | }, | +
| + | + | +
| + | // func walltime() (sec int64, nsec int32) | +
| + | "runtime.walltime": (sp) => { | +
| + | const msec = (new Date).getTime(); | +
| + | setInt64(sp + 8, msec / 1000); | +
| + | mem().setInt32(sp + 16, (msec % 1000) * 1000000, true); | +
| + | }, | +
| + | + | +
| + | // func scheduleCallback(delay int64) int32 | +
| + | "runtime.scheduleCallback": (sp) => { | +
| + | const id = this._nextCallbackTimeoutID; | +
| + | this._nextCallbackTimeoutID++; | +
| + | this._callbackTimeouts.set(id, setTimeout( | +
| + | () => { this._resume(); }, | +
| + | getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early | +
| + | )); | +
| + | mem().setInt32(sp + 16, id, true); | +
| + | }, | +
| + | + | +
| + | // func clearScheduledCallback(id int32) | +
| + | "runtime.clearScheduledCallback": (sp) => { | +
| + | const id = mem().getInt32(sp + 8, true); | +
| + | clearTimeout(this._callbackTimeouts.get(id)); | +
| + | this._callbackTimeouts.delete(id); | +
| + | }, | +
| + | + | +
| + | // func getRandomData(r []byte) | +
| + | "runtime.getRandomData": (sp) => { | +
| + | crypto.getRandomValues(loadSlice(sp + 8)); | +
| + | }, | +
| + | + | +
| + | // func stringVal(value string) ref | +
| + | "syscall/js.stringVal": (sp) => { | +
| + | storeValue(sp + 24, loadString(sp + 8)); | +
| + | }, | +
| + | + | +
| + | // func valueGet(v ref, p string) ref | +
| + | "syscall/js.valueGet": (sp) => { | +
| + | const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16)); | +
| + | sp = this._inst.exports.getsp(); // see comment above | +
| + | storeValue(sp + 32, result); | +
| + | }, | +
| + | + | +
| + | // func valueSet(v ref, p string, x ref) | +
| + | "syscall/js.valueSet": (sp) => { | +
| + | Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32)); | +
| + | }, | +
| + | + | +
| + | // func valueIndex(v ref, i int) ref | +
| + | "syscall/js.valueIndex": (sp) => { | +
| + | storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16))); | +
| + | }, | +
| + | + | +
| + | // valueSetIndex(v ref, i int, x ref) | +
| + | "syscall/js.valueSetIndex": (sp) => { | +
| + | Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24)); | +
| + | }, | +
| + | + | +
| + | // func valueCall(v ref, m string, args []ref) (ref, bool) | +
| + | "syscall/js.valueCall": (sp) => { | +
| + | try { | +
| + | const v = loadValue(sp + 8); | +
| + | const m = Reflect.get(v, loadString(sp + 16)); | +
| + | const args = loadSliceOfValues(sp + 32); | +
| + | const result = Reflect.apply(m, v, args); | +
| + | sp = this._inst.exports.getsp(); // see comment above | +
| + | storeValue(sp + 56, result); | +
| + | mem().setUint8(sp + 64, 1); | +
| + | } catch (err) { | +
| + | storeValue(sp + 56, err); | +
| + | mem().setUint8(sp + 64, 0); | +
| + | } | +
| + | }, | +
| + | + | +
| + | // func valueInvoke(v ref, args []ref) (ref, bool) | +
| + | "syscall/js.valueInvoke": (sp) => { | +
| + | try { | +
| + | const v = loadValue(sp + 8); | +
| + | const args = loadSliceOfValues(sp + 16); | +
| + | const result = Reflect.apply(v, undefined, args); | +
| + | sp = this._inst.exports.getsp(); // see comment above | +
| + | storeValue(sp + 40, result); | +
| + | mem().setUint8(sp + 48, 1); | +
| + | } catch (err) { | +
| + | storeValue(sp + 40, err); | +
| + | mem().setUint8(sp + 48, 0); | +
| + | } | +
| + | }, | +
| + | + | +
| + | // func valueNew(v ref, args []ref) (ref, bool) | +
| + | "syscall/js.valueNew": (sp) => { | +
| + | try { | +
| + | const v = loadValue(sp + 8); | +
| + | const args = loadSliceOfValues(sp + 16); | +
| + | const result = Reflect.construct(v, args); | +
| + | sp = this._inst.exports.getsp(); // see comment above | +
| + | storeValue(sp + 40, result); | +
| + | mem().setUint8(sp + 48, 1); | +
| + | } catch (err) { | +
| + | storeValue(sp + 40, err); | +
| + | mem().setUint8(sp + 48, 0); | +
| + | } | +
| + | }, | +
| + | + | +
| + | // func valueLength(v ref) int | +
| + | "syscall/js.valueLength": (sp) => { | +
| + | setInt64(sp + 16, parseInt(loadValue(sp + 8).length)); | +
| + | }, | +
| + | + | +
| + | // valuePrepareString(v ref) (ref, int) | +
| + | "syscall/js.valuePrepareString": (sp) => { | +
| + | const str = encoder.encode(String(loadValue(sp + 8))); | +
| + | storeValue(sp + 16, str); | +
| + | setInt64(sp + 24, str.length); | +
| + | }, | +
| + | + | +
| + | // valueLoadString(v ref, b []byte) | +
| + | "syscall/js.valueLoadString": (sp) => { | +
| + | const str = loadValue(sp + 8); | +
| + | loadSlice(sp + 16).set(str); | +
| + | }, | +
| + | + | +
| + | // func valueInstanceOf(v ref, t ref) bool | +
| + | "syscall/js.valueInstanceOf": (sp) => { | +
| + | mem().setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16)); | +
| + | }, | +
| + | + | +
| + | "debug": (value) => { | +
| + | console.log(value); | +
| + | }, | +
| + | } | +
| + | }; | +
| + | } | +
| + | + | +
| + | async run(instance) { | +
| + | this._inst = instance; | +
| + | this._values = [ // TODO: garbage collection | +
| + | NaN, | +
| + | 0, | +
| + | null, | +
| + | true, | +
| + | false, | +
| + | global, | +
| + | this._inst.exports.mem, | +
| + | this, | +
| + | ]; | +
| + | this._refs = new Map(); | +
| + | this.exited = false; | +
| + | + | +
| + | const mem = new DataView(this._inst.exports.mem.buffer) | +
| + | + | +
| + | // Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory. | +
| + | let offset = 4096; | +
| + | + | +
| + | const strPtr = (str) => { | +
| + | let ptr = offset; | +
| + | new Uint8Array(mem.buffer, offset, str.length + 1).set(encoder.encode(str + "\0")); | +
| + | offset += str.length + (8 - (str.length % 8)); | +
| + | return ptr; | +
| + | }; | +
| + | + | +
| + | const argc = this.argv.length; | +
| + | + | +
| + | const argvPtrs = []; | +
| + | this.argv.forEach((arg) => { | +
| + | argvPtrs.push(strPtr(arg)); | +
| + | }); | +
| + | + | +
| + | const keys = Object.keys(this.env).sort(); | +
| + | argvPtrs.push(keys.length); | +
| + | keys.forEach((key) => { | +
| + | argvPtrs.push(strPtr(`${key}=${this.env[key]}`)); | +
| + | }); | +
| + | + | +
| + | const argv = offset; | +
| + | argvPtrs.forEach((ptr) => { | +
| + | mem.setUint32(offset, ptr, true); | +
| + | mem.setUint32(offset + 4, 0, true); | +
| + | offset += 8; | +
| + | }); | +
| + | + | +
| + | this._inst.exports.run(argc, argv); | +
| + | if (this.exited) { | +
| + | this._resolveExitPromise(); | +
| + | } | +
| + | await this._exitPromise; | +
| + | } | +
| + | + | +
| + | _resume() { | +
| + | if (this.exited) { | +
| + | throw new Error("bad callback: Go program has already exited"); | +
| + | } | +
| + | this._inst.exports.resume(); | +
| + | if (this.exited) { | +
| + | this._resolveExitPromise(); | +
| + | } | +
| + | } | +
| + | + | +
| + | _makeCallbackHelper(id) { | +
| + | const go = this; | +
| + | return function () { | +
| + | const cb = { id: id, this: this, args: arguments }; | +
| + | go._pendingCallback = cb; | +
| + | go._resume(); | +
| + | return cb.result; | +
| + | }; | +
| + | } | +
| + | } | +
| + | + | +
| + | if (isNodeJS) { | +
| + | if (process.argv.length < 3) { | +
| + | process.stderr.write("usage: go_js_wasm_exec [wasm binary] [arguments]\n"); | +
| + | process.exit(1); | +
| + | } | +
| + | + | +
| + | const go = new Go(); | +
| + | go.argv = process.argv.slice(2); | +
| + | go.env = process.env; | +
| + | go.exit = process.exit; | +
| + | WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => { | +
| + | process.on("exit", (code) => { // Node.js exits if no callback is pending | +
| + | if (code === 0 && !go.exited) { | +
| + | // deadlock, make Go print error and stack traces | +
| + | go._pendingCallback = { id: 0 }; | +
| + | go._resume(); | +
| + | } | +
| + | }); | +
| + | return go.run(result.instance); | +
| + | }).catch((err) => { | +
| + | throw err; | +
| + | }); | +
| + | } | +
| + | })(); | +