+
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+ + /go + +

+ +
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+ + + + + Permalink + + + + + + +
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+ + + + + + weekly.2012-03-27 + + + + + + weekly.2012-03-22 + + + + + + weekly.2012-03-13 + + + + + + weekly.2012-03-04 + + + + + + weekly.2012-02-22 + + + + + + weekly.2012-02-14 + + + + + + weekly.2012-02-07 + + + + + + weekly.2012-01-27 + + + + + + weekly.2012-01-20 + + + + + + weekly.2012-01-15 + + + + + + weekly.2011-12-22 + + + + + + weekly.2011-12-14 + + + + + + weekly.2011-12-06 + + + + + + weekly.2011-12-02 + + + + + + weekly.2011-12-01 + + + + + + weekly.2011-11-18 + + + + + + weekly.2011-11-09 + + + + + + weekly.2011-11-08 + + + + + + weekly.2011-11-02 + + + + + + weekly.2011-11-01 + + + + + + weekly.2011-10-26 + + + + + + weekly.2011-10-25 + + + + + + weekly.2011-10-18 + + + + + + weekly.2011-10-06 + + + + + + weekly.2011-09-21 + + + + + + weekly.2011-09-16 + + + + + + weekly.2011-09-07 + + + + + + weekly.2011-09-01 + + + + + + weekly.2011-08-17 + + + + + + weekly.2011-08-10 + + + + + + weekly.2011-07-29 + + + + + + weekly.2011-07-19 + + + + + + weekly.2011-07-07 + + + + + + weekly.2011-06-23 + + + + + + weekly.2011-06-16 + + + + + + weekly.2011-06-09 + + + + + + weekly.2011-06-02 + + + + + + weekly.2011-05-22 + + + + + + weekly.2011-04-27 + + + + + + weekly.2011-04-13 + + + + + + weekly.2011-04-04 + + + + + + weekly.2011-03-28 + + + + + + weekly.2011-03-15 + + + + + + weekly.2011-03-07.1 + + + + + + weekly.2011-03-07 + + + + + + weekly.2011-02-24 + + + + + + weekly.2011-02-15 + + + + + + weekly.2011-02-01.1 + + + + + + weekly.2011-02-01 + + + + + + weekly.2011-01-20 + + + + + + weekly.2011-01-19 + + + + + + weekly.2011-01-12 + + + + + + weekly.2011-01-06 + + + + + + weekly.2010-12-22 + + + + + + weekly.2010-12-15.1 + + + + + + weekly.2010-12-15 + + + + + + weekly.2010-12-08 + + + + + + weekly.2010-12-02 + + + + + + weekly.2010-11-23 + + + + + + weekly.2010-11-10 + + + + + + weekly.2010-11-02 + + + + + + weekly.2010-10-27 + + + + + + weekly.2010-10-20 + + + + + + weekly.2010-10-13.1 + + + + + + weekly.2010-10-13 + + + + + + weekly.2010-09-29 + + + + + + weekly.2010-09-22 + + + + + + weekly.2010-09-15 + + + + + + weekly.2010-09-06 + + + + + + weekly.2010-08-25 + + + + + + weekly.2010-08-11 + + + + + + weekly.2010-08-04 + + + + + + weekly.2010-07-29 + + + + + + weekly.2010-07-14 + + + + + + weekly.2010-07-01 + + + + + + weekly.2010-06-21 + + + + + + weekly.2010-06-09 + + + + + + weekly.2010-05-27 + + + + + + weekly.2010-05-04 + + + + + + weekly.2010-04-27 + + + + + + weekly.2010-04-13 + + + + + + weekly.2010-03-30 + + + + + + weekly.2010-03-22 + + + + + + weekly.2010-03-15 + + + + + + weekly.2010-03-04 + + + + + + weekly.2010-02-23 + + + + + + weekly.2010-02-17 + + + + + + weekly.2010-02-04 + + + + + + weekly.2010-01-27 + + + + + + weekly.2010-01-13 + + + + + + weekly.2010-01-05 + + + + + + weekly.2009-12-22 + + + + + + weekly.2009-12-09 + + + + + + weekly.2009-12-07 + + + + + + weekly.2009-11-17 + + + + + + weekly.2009-11-12 + + + + + + weekly.2009-11-10.1 + + + + + + weekly.2009-11-10 + + + + + + weekly.2009-11-06 + + + + + + weekly + + +
+ +
Nothing to show
+
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+ + Find file + + + Copy path + +
+ +
+ + + +
+ + + 6dd70fc + + Nov 10, 2018 + + + +
+ +
+ + + 5 contributors + + +
+ +

Users who have contributed to this file

+
+ + + + +
+ + @neelance + + @myitcv + + @ncw + + @cherrymui + + @xudongzheng + + +
+
+ + + +
+
+
+ + +
+ Raw + Blame + History +
+ + + + +
+ +
+ 461 lines (407 sloc) + + 12.6 KB +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
// 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;
});
}
})();
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