diff --git a/channels/main.go b/channels/main.go index ec5aab1..2bef5f3 100644 --- a/channels/main.go +++ b/channels/main.go @@ -13,7 +13,7 @@ func sum(s []int, c chan int) { } func main() { - s := []int{7, 2, 8, -9, 4, 0} + s := []int{7, 2, 8, 9, -4, 0} c := make(chan int) go sum(s[:len(s)/2], c) diff --git a/html/index.html b/html/index.html deleted file mode 100644 index 7623774..0000000 --- a/html/index.html +++ /dev/null @@ -1,43 +0,0 @@ - - - - - - - Go wasm - - - - - - - -
- - - \ No newline at end of file diff --git a/html/test.wasm b/html/test.wasm deleted file mode 100755 index 6e6467f..0000000 Binary files a/html/test.wasm and /dev/null differ diff --git a/html/wasm_exec.js b/html/wasm_exec.js deleted file mode 100644 index 94b9552..0000000 --- a/html/wasm_exec.js +++ /dev/null @@ -1,437 +0,0 @@ -// 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. - -(() => { - // Map web browser API and Node.js API to a single common API (preferring web standards over Node.js API). - const isNodeJS = typeof process !== "undefined"; - 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 { - if (typeof window !== "undefined") { - window.global = window; - } else if (typeof self !== "undefined") { - self.global = self; - } else { - throw new Error("cannot export Go (neither window nor self is defined)"); - } - - 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; - }, - openSync(path, flags, mode) { - const err = new Error("not implemented"); - err.code = "ENOSYS"; - throw err; - }, - }; - } - - 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._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 (!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; - } - mem().setFloat64(addr, v, true); - return; - } - - switch (v) { - case undefined: - mem().setUint32(addr + 4, nanHead, true); - mem().setUint32(addr, 1, 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: { - // 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._resolveCallbackPromise(); }, - 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) => { - storeValue(sp + 32, Reflect.get(loadValue(sp + 8), loadString(sp + 16))); - }, - - // 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); - storeValue(sp + 56, Reflect.apply(m, v, args)); - 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); - storeValue(sp + 40, Reflect.apply(v, undefined, args)); - 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); - storeValue(sp + 40, Reflect.construct(v, args)); - 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, - undefined, - null, - true, - false, - global, - this._inst.exports.mem, - this, - ]; - this._refs = new Map(); - this._callbackShutdown = false; - 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; - }); - - while (true) { - const callbackPromise = new Promise((resolve) => { - this._resolveCallbackPromise = () => { - if (this.exited) { - throw new Error("bad callback: Go program has already exited"); - } - setTimeout(resolve, 0); // make sure it is asynchronous - }; - }); - this._inst.exports.run(argc, argv); - if (this.exited) { - break; - } - await callbackPromise; - } - } - - static _makeCallbackHelper(id, pendingCallbacks, go) { - return function() { - pendingCallbacks.push({ id: id, args: arguments }); - go._resolveCallbackPromise(); - }; - } - - static _makeEventCallbackHelper(preventDefault, stopPropagation, stopImmediatePropagation, fn) { - return function(event) { - if (preventDefault) { - event.preventDefault(); - } - if (stopPropagation) { - event.stopPropagation(); - } - if (stopImmediatePropagation) { - event.stopImmediatePropagation(); - } - fn(event); - }; - } - } - - 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._callbackShutdown = true; - go._inst.exports.run(); - } - }); - return go.run(result.instance); - }).catch((err) => { - throw err; - }); - } -})();