gpython/repl/web/wasm_exec.js at main · go-python/gpython · GitHub

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// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Slightly modified by ncw to:

// * add empty implementation of fsyncSync

// See wasm_exec.js.patch for details

(() => {

// 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;

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);

fsyncSync(fd) {

};

}

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;

});

}

})();

gpython/repl/web/wasm_exec.js at main · go-python/gpython · GitHub

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