forked from matrix/element-web
Only works on Go 1.14 now
This commit is contained in:
Kegan Dougal
parent
7e15090364
commit
92fe2b8935
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@ -27,12 +27,15 @@
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}
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if (!global.fs && global.require) {
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// XXX: require("fs") apparently returns {} in vector-web for webpack reasons
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// so remove this so the polyfill below kicks in.
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//
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//global.fs = require("fs");
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// global.fs = require("fs");
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}
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const enosys = () => {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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return err;
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};
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if (!global.fs) {
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let outputBuf = "";
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global.fs = {
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@ -48,27 +51,53 @@
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},
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write(fd, buf, offset, length, position, callback) {
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if (offset !== 0 || length !== buf.length || position !== null) {
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throw new Error("not implemented");
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callback(enosys());
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return;
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}
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const n = this.writeSync(fd, buf);
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callback(null, n);
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},
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open(path, flags, mode, callback) {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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callback(err);
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},
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read(fd, buffer, offset, length, position, callback) {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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callback(err);
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},
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fsync(fd, callback) {
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callback(null);
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},
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chmod(path, mode, callback) { callback(enosys()); },
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chown(path, uid, gid, callback) { callback(enosys()); },
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close(fd, callback) { callback(enosys()); },
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fchmod(fd, mode, callback) { callback(enosys()); },
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fchown(fd, uid, gid, callback) { callback(enosys()); },
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fstat(fd, callback) { callback(enosys()); },
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fsync(fd, callback) { callback(null); },
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ftruncate(fd, length, callback) { callback(enosys()); },
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lchown(path, uid, gid, callback) { callback(enosys()); },
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link(path, link, callback) { callback(enosys()); },
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lstat(path, callback) { callback(enosys()); },
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mkdir(path, perm, callback) { callback(enosys()); },
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open(path, flags, mode, callback) { callback(enosys()); },
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read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
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readdir(path, callback) { callback(enosys()); },
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readlink(path, callback) { callback(enosys()); },
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rename(from, to, callback) { callback(enosys()); },
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rmdir(path, callback) { callback(enosys()); },
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stat(path, callback) { callback(enosys()); },
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symlink(path, link, callback) { callback(enosys()); },
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truncate(path, length, callback) { callback(enosys()); },
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unlink(path, callback) { callback(enosys()); },
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utimes(path, atime, mtime, callback) { callback(enosys()); },
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};
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}
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if (!global.process) {
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global.process = {
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getuid() { return -1; },
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getgid() { return -1; },
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geteuid() { return -1; },
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getegid() { return -1; },
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getgroups() { throw enosys(); },
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pid: -1,
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ppid: -1,
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umask() { throw enosys(); },
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cwd() { throw enosys(); },
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chdir() { throw enosys(); },
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}
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}
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if (!global.crypto) {
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const nodeCrypto = require("crypto");
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global.crypto = {
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@ -116,24 +145,19 @@
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this._scheduledTimeouts = new Map();
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this._nextCallbackTimeoutID = 1;
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const mem = () => {
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// The buffer may change when requesting more memory.
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return new DataView(this._inst.exports.mem.buffer);
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}
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const setInt64 = (addr, v) => {
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mem().setUint32(addr + 0, v, true);
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mem().setUint32(addr + 4, Math.floor(v / 4294967296), true);
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this.mem.setUint32(addr + 0, v, true);
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this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
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}
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const getInt64 = (addr) => {
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const low = mem().getUint32(addr + 0, true);
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const high = mem().getInt32(addr + 4, true);
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const low = this.mem.getUint32(addr + 0, true);
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const high = this.mem.getInt32(addr + 4, true);
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return low + high * 4294967296;
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}
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const loadValue = (addr) => {
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const f = mem().getFloat64(addr, true);
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const f = this.mem.getFloat64(addr, true);
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if (f === 0) {
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return undefined;
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}
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@ -141,7 +165,7 @@
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return f;
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}
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const id = mem().getUint32(addr, true);
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const id = this.mem.getUint32(addr, true);
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return this._values[id];
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}
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@ -150,57 +174,62 @@
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if (typeof v === "number") {
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if (isNaN(v)) {
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mem().setUint32(addr + 4, nanHead, true);
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mem().setUint32(addr, 0, true);
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 0, true);
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return;
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}
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if (v === 0) {
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mem().setUint32(addr + 4, nanHead, true);
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mem().setUint32(addr, 1, true);
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 1, true);
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return;
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}
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mem().setFloat64(addr, v, true);
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this.mem.setFloat64(addr, v, true);
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return;
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}
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switch (v) {
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case undefined:
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mem().setFloat64(addr, 0, true);
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this.mem.setFloat64(addr, 0, true);
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return;
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case null:
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mem().setUint32(addr + 4, nanHead, true);
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mem().setUint32(addr, 2, true);
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 2, true);
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return;
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case true:
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mem().setUint32(addr + 4, nanHead, true);
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mem().setUint32(addr, 3, true);
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 3, true);
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return;
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case false:
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mem().setUint32(addr + 4, nanHead, true);
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mem().setUint32(addr, 4, true);
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this.mem.setUint32(addr + 4, nanHead, true);
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this.mem.setUint32(addr, 4, true);
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return;
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}
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let ref = this._refs.get(v);
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if (ref === undefined) {
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ref = this._values.length;
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this._values.push(v);
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this._refs.set(v, ref);
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let id = this._ids.get(v);
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if (id === undefined) {
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id = this._idPool.pop();
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if (id === undefined) {
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id = this._values.length;
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}
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let typeFlag = 0;
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this._values[id] = v;
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this._goRefCounts[id] = 0;
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this._ids.set(v, id);
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}
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this._goRefCounts[id]++;
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let typeFlag = 1;
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switch (typeof v) {
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case "string":
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typeFlag = 1;
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break;
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case "symbol":
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typeFlag = 2;
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break;
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case "function":
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case "symbol":
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typeFlag = 3;
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break;
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case "function":
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typeFlag = 4;
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break;
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}
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mem().setUint32(addr + 4, nanHead | typeFlag, true);
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mem().setUint32(addr, ref, true);
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this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
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this.mem.setUint32(addr, id, true);
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}
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const loadSlice = (addr) => {
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@ -235,11 +264,13 @@
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// func wasmExit(code int32)
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"runtime.wasmExit": (sp) => {
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const code = mem().getInt32(sp + 8, true);
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const code = this.mem.getInt32(sp + 8, true);
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this.exited = true;
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delete this._inst;
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delete this._values;
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delete this._refs;
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delete this._goRefCounts;
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delete this._ids;
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delete this._idPool;
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this.exit(code);
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},
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@ -247,20 +278,25 @@
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"runtime.wasmWrite": (sp) => {
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const fd = getInt64(sp + 8);
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const p = getInt64(sp + 16);
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const n = mem().getInt32(sp + 24, true);
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const n = this.mem.getInt32(sp + 24, true);
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fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
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},
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// func nanotime() int64
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"runtime.nanotime": (sp) => {
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// func resetMemoryDataView()
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"runtime.resetMemoryDataView": (sp) => {
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this.mem = new DataView(this._inst.exports.mem.buffer);
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},
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// func nanotime1() int64
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"runtime.nanotime1": (sp) => {
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setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
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},
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// func walltime() (sec int64, nsec int32)
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"runtime.walltime": (sp) => {
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// func walltime1() (sec int64, nsec int32)
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"runtime.walltime1": (sp) => {
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const msec = (new Date).getTime();
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setInt64(sp + 8, msec / 1000);
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mem().setInt32(sp + 16, (msec % 1000) * 1000000, true);
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this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
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},
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// func scheduleTimeoutEvent(delay int64) int32
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@ -279,12 +315,12 @@
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},
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getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
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));
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mem().setInt32(sp + 16, id, true);
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this.mem.setInt32(sp + 16, id, true);
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},
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// func clearTimeoutEvent(id int32)
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"runtime.clearTimeoutEvent": (sp) => {
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const id = mem().getInt32(sp + 8, true);
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const id = this.mem.getInt32(sp + 8, true);
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clearTimeout(this._scheduledTimeouts.get(id));
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this._scheduledTimeouts.delete(id);
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},
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@ -294,6 +330,18 @@
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crypto.getRandomValues(loadSlice(sp + 8));
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},
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// func finalizeRef(v ref)
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"syscall/js.finalizeRef": (sp) => {
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const id = this.mem.getUint32(sp + 8, true);
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this._goRefCounts[id]--;
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if (this._goRefCounts[id] === 0) {
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const v = this._values[id];
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this._values[id] = null;
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this._ids.delete(v);
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this._idPool.push(id);
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}
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},
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// func stringVal(value string) ref
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"syscall/js.stringVal": (sp) => {
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storeValue(sp + 24, loadString(sp + 8));
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@ -311,6 +359,11 @@
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Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
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},
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// func valueDelete(v ref, p string)
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"syscall/js.valueDelete": (sp) => {
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Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
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},
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// func valueIndex(v ref, i int) ref
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"syscall/js.valueIndex": (sp) => {
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storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
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@ -330,10 +383,10 @@
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const result = Reflect.apply(m, v, args);
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sp = this._inst.exports.getsp(); // see comment above
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storeValue(sp + 56, result);
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mem().setUint8(sp + 64, 1);
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this.mem.setUint8(sp + 64, 1);
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} catch (err) {
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storeValue(sp + 56, err);
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mem().setUint8(sp + 64, 0);
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this.mem.setUint8(sp + 64, 0);
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}
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},
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@ -345,10 +398,10 @@
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const result = Reflect.apply(v, undefined, args);
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sp = this._inst.exports.getsp(); // see comment above
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storeValue(sp + 40, result);
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mem().setUint8(sp + 48, 1);
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this.mem.setUint8(sp + 48, 1);
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} catch (err) {
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storeValue(sp + 40, err);
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mem().setUint8(sp + 48, 0);
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this.mem.setUint8(sp + 48, 0);
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}
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},
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@ -360,10 +413,10 @@
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const result = Reflect.construct(v, args);
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sp = this._inst.exports.getsp(); // see comment above
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storeValue(sp + 40, result);
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mem().setUint8(sp + 48, 1);
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this.mem.setUint8(sp + 48, 1);
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} catch (err) {
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storeValue(sp + 40, err);
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mem().setUint8(sp + 48, 0);
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this.mem.setUint8(sp + 48, 0);
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}
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},
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@ -387,7 +440,7 @@
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// func valueInstanceOf(v ref, t ref) bool
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"syscall/js.valueInstanceOf": (sp) => {
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mem().setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16));
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this.mem.setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16));
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},
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// func copyBytesToGo(dst []byte, src ref) (int, bool)
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@ -395,13 +448,13 @@
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const dst = loadSlice(sp + 8);
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const src = loadValue(sp + 32);
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if (!(src instanceof Uint8Array)) {
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mem().setUint8(sp + 48, 0);
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this.mem.setUint8(sp + 48, 0);
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return;
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}
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const toCopy = src.subarray(0, dst.length);
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dst.set(toCopy);
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setInt64(sp + 40, toCopy.length);
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mem().setUint8(sp + 48, 1);
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this.mem.setUint8(sp + 48, 1);
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},
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// func copyBytesToJS(dst ref, src []byte) (int, bool)
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@ -409,13 +462,13 @@
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const dst = loadValue(sp + 8);
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const src = loadSlice(sp + 16);
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if (!(dst instanceof Uint8Array)) {
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mem().setUint8(sp + 48, 0);
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this.mem.setUint8(sp + 48, 0);
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return;
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}
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const toCopy = src.subarray(0, dst.length);
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dst.set(toCopy);
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setInt64(sp + 40, toCopy.length);
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mem().setUint8(sp + 48, 1);
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this.mem.setUint8(sp + 48, 1);
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},
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"debug": (value) => {
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@ -427,7 +480,8 @@
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async run(instance) {
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this._inst = instance;
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this._values = [ // TODO: garbage collection
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this.mem = new DataView(this._inst.exports.mem.buffer);
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this._values = [ // JS values that Go currently has references to, indexed by reference id
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NaN,
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0,
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null,
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@ -436,10 +490,10 @@
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global,
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this,
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];
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this._refs = new Map();
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this.exited = false;
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const mem = new DataView(this._inst.exports.mem.buffer)
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this._goRefCounts = []; // number of references that Go has to a JS value, indexed by reference id
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this._ids = new Map(); // mapping from JS values to reference ids
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this._idPool = []; // unused ids that have been garbage collected
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this.exited = false; // whether the Go program has exited
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// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
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let offset = 4096;
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@ -447,7 +501,7 @@
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const strPtr = (str) => {
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const ptr = offset;
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const bytes = encoder.encode(str + "\0");
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new Uint8Array(mem.buffer, offset, bytes.length).set(bytes);
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new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
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offset += bytes.length;
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if (offset % 8 !== 0) {
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offset += 8 - (offset % 8);
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@ -461,17 +515,18 @@
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this.argv.forEach((arg) => {
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argvPtrs.push(strPtr(arg));
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});
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argvPtrs.push(0);
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const keys = Object.keys(this.env).sort();
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argvPtrs.push(keys.length);
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keys.forEach((key) => {
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argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
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});
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argvPtrs.push(0);
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const argv = offset;
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argvPtrs.forEach((ptr) => {
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mem.setUint32(offset, ptr, true);
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mem.setUint32(offset + 4, 0, true);
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this.mem.setUint32(offset, ptr, true);
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this.mem.setUint32(offset + 4, 0, true);
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offset += 8;
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});
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