627 lines
18 KiB
JavaScript
627 lines
18 KiB
JavaScript
// 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 multiple JavaScript environments to a single common API,
|
|
// preferring web standards over Node.js API.
|
|
//
|
|
// Environments considered:
|
|
// - Browsers
|
|
// - Node.js
|
|
// - Electron
|
|
// - Parcel
|
|
// - Webpack
|
|
|
|
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)");
|
|
}
|
|
|
|
if (!global.require && typeof require !== "undefined") {
|
|
global.require = require;
|
|
}
|
|
|
|
if (!global.fs && global.require) {
|
|
const fs = require("fs");
|
|
if (typeof fs === "object" && fs !== null && Object.keys(fs).length !== 0) {
|
|
global.fs = fs;
|
|
}
|
|
}
|
|
|
|
const enosys = () => {
|
|
const err = new Error("not implemented");
|
|
err.code = "ENOSYS";
|
|
return err;
|
|
};
|
|
|
|
if (!global.fs) {
|
|
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) {
|
|
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 (!global.process) {
|
|
global.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 (!global.crypto && global.require) {
|
|
const nodeCrypto = require("crypto");
|
|
global.crypto = {
|
|
getRandomValues(b) {
|
|
nodeCrypto.randomFillSync(b);
|
|
},
|
|
};
|
|
}
|
|
if (!global.crypto) {
|
|
throw new Error("global.crypto is not available, polyfill required (getRandomValues only)");
|
|
}
|
|
|
|
if (!global.performance) {
|
|
global.performance = {
|
|
now() {
|
|
const [sec, nsec] = process.hrtime();
|
|
return sec * 1000 + nsec / 1000000;
|
|
},
|
|
};
|
|
}
|
|
|
|
if (!global.TextEncoder && global.require) {
|
|
global.TextEncoder = require("util").TextEncoder;
|
|
}
|
|
if (!global.TextEncoder) {
|
|
throw new Error("global.TextEncoder is not available, polyfill required");
|
|
}
|
|
|
|
if (!global.TextDecoder && global.require) {
|
|
global.TextDecoder = require("util").TextDecoder;
|
|
}
|
|
if (!global.TextDecoder) {
|
|
throw new Error("global.TextDecoder is not available, polyfill required");
|
|
}
|
|
|
|
// End of polyfills for common API.
|
|
|
|
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._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 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 = {
|
|
go: {
|
|
// 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 walltime1() (sec int64, nsec int32)
|
|
"runtime.walltime1": (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) + 1, // setTimeout has been seen to fire up to 1 millisecond early
|
|
));
|
|
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) {
|
|
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) {
|
|
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) {
|
|
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,
|
|
global,
|
|
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],
|
|
[global, 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;
|
|
});
|
|
|
|
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;
|
|
};
|
|
}
|
|
}
|
|
|
|
if (
|
|
typeof module !== "undefined" &&
|
|
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();
|
|
go.argv = process.argv.slice(2);
|
|
go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, 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 event handler is pending
|
|
if (code === 0 && !go.exited) {
|
|
// deadlock, make Go print error and stack traces
|
|
go._pendingEvent = { id: 0 };
|
|
go._resume();
|
|
}
|
|
});
|
|
return go.run(result.instance);
|
|
}).catch((err) => {
|
|
console.error(err);
|
|
process.exit(1);
|
|
});
|
|
}
|
|
})();
|