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