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Only works on Go 1.14 now

This commit is contained in:
Kegan Dougal 2020-07-03 10:45:26 +01:00
parent 7e15090364
commit 92fe2b8935
1 changed files with 138 additions and 83 deletions
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221
src/vector/wasm_exec.js
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@ -27,12 +27,15 @@
} }
if (!global.fs && global.require) { if (!global.fs && global.require) {
// XXX: require("fs") apparently returns {} in vector-web for webpack reasons // global.fs = require("fs");
// so remove this so the polyfill below kicks in.
//
//global.fs = require("fs");
} }
const enosys = () => {
const err = new Error("not implemented");
err.code = "ENOSYS";
return err;
};
if (!global.fs) { if (!global.fs) {
let outputBuf = ""; let outputBuf = "";
global.fs = { global.fs = {
@ -48,27 +51,53 @@
}, },
write(fd, buf, offset, length, position, callback) { write(fd, buf, offset, length, position, callback) {
if (offset !== 0 || length !== buf.length || position !== null) { if (offset !== 0 || length !== buf.length || position !== null) {
throw new Error("not implemented"); callback(enosys());
return;
} }
const n = this.writeSync(fd, buf); const n = this.writeSync(fd, buf);
callback(null, n); callback(null, n);
}, },
open(path, flags, mode, callback) { chmod(path, mode, callback) { callback(enosys()); },
const err = new Error("not implemented"); chown(path, uid, gid, callback) { callback(enosys()); },
err.code = "ENOSYS"; close(fd, callback) { callback(enosys()); },
callback(err); fchmod(fd, mode, callback) { callback(enosys()); },
}, fchown(fd, uid, gid, callback) { callback(enosys()); },
read(fd, buffer, offset, length, position, callback) { fstat(fd, callback) { callback(enosys()); },
const err = new Error("not implemented"); fsync(fd, callback) { callback(null); },
err.code = "ENOSYS"; ftruncate(fd, length, callback) { callback(enosys()); },
callback(err); lchown(path, uid, gid, callback) { callback(enosys()); },
}, link(path, link, callback) { callback(enosys()); },
fsync(fd, callback) { lstat(path, callback) { callback(enosys()); },
callback(null); 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) { if (!global.crypto) {
const nodeCrypto = require("crypto"); const nodeCrypto = require("crypto");
global.crypto = { global.crypto = {
@ -116,24 +145,19 @@
this._scheduledTimeouts = new Map(); this._scheduledTimeouts = new Map();
this._nextCallbackTimeoutID = 1; 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) => { const setInt64 = (addr, v) => {
mem().setUint32(addr + 0, v, true); this.mem.setUint32(addr + 0, v, true);
mem().setUint32(addr + 4, Math.floor(v / 4294967296), true); this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
} }
const getInt64 = (addr) => { const getInt64 = (addr) => {
const low = mem().getUint32(addr + 0, true); const low = this.mem.getUint32(addr + 0, true);
const high = mem().getInt32(addr + 4, true); const high = this.mem.getInt32(addr + 4, true);
return low + high * 4294967296; return low + high * 4294967296;
} }
const loadValue = (addr) => { const loadValue = (addr) => {
const f = mem().getFloat64(addr, true); const f = this.mem.getFloat64(addr, true);
if (f === 0) { if (f === 0) {
return undefined; return undefined;
} }
@ -141,7 +165,7 @@
return f; return f;
} }
const id = mem().getUint32(addr, true); const id = this.mem.getUint32(addr, true);
return this._values[id]; return this._values[id];
} }
@ -150,57 +174,62 @@
if (typeof v === "number") { if (typeof v === "number") {
if (isNaN(v)) { if (isNaN(v)) {
mem().setUint32(addr + 4, nanHead, true); this.mem.setUint32(addr + 4, nanHead, true);
mem().setUint32(addr, 0, true); this.mem.setUint32(addr, 0, true);
return; return;
} }
if (v === 0) { if (v === 0) {
mem().setUint32(addr + 4, nanHead, true); this.mem.setUint32(addr + 4, nanHead, true);
mem().setUint32(addr, 1, true); this.mem.setUint32(addr, 1, true);
return; return;
} }
mem().setFloat64(addr, v, true); this.mem.setFloat64(addr, v, true);
return; return;
} }
switch (v) { switch (v) {
case undefined: case undefined:
mem().setFloat64(addr, 0, true); this.mem.setFloat64(addr, 0, true);
return; return;
case null: case null:
mem().setUint32(addr + 4, nanHead, true); this.mem.setUint32(addr + 4, nanHead, true);
mem().setUint32(addr, 2, true); this.mem.setUint32(addr, 2, true);
return; return;
case true: case true:
mem().setUint32(addr + 4, nanHead, true); this.mem.setUint32(addr + 4, nanHead, true);
mem().setUint32(addr, 3, true); this.mem.setUint32(addr, 3, true);
return; return;
case false: case false:
mem().setUint32(addr + 4, nanHead, true); this.mem.setUint32(addr + 4, nanHead, true);
mem().setUint32(addr, 4, true); this.mem.setUint32(addr, 4, true);
return; return;
} }
let ref = this._refs.get(v); let id = this._ids.get(v);
if (ref === undefined) { if (id === undefined) {
ref = this._values.length; id = this._idPool.pop();
this._values.push(v); if (id === undefined) {
this._refs.set(v, ref); id = this._values.length;
}
this._values[id] = v;
this._goRefCounts[id] = 0;
this._ids.set(v, id);
} }
let typeFlag = 0; this._goRefCounts[id]++;
let typeFlag = 1;
switch (typeof v) { switch (typeof v) {
case "string": case "string":
typeFlag = 1;
break;
case "symbol":
typeFlag = 2; typeFlag = 2;
break; break;
case "function": case "symbol":
typeFlag = 3; typeFlag = 3;
break; break;
case "function":
typeFlag = 4;
break;
} }
mem().setUint32(addr + 4, nanHead | typeFlag, true); this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
mem().setUint32(addr, ref, true); this.mem.setUint32(addr, id, true);
} }
const loadSlice = (addr) => { const loadSlice = (addr) => {
@ -235,11 +264,13 @@
// func wasmExit(code int32) // func wasmExit(code int32)
"runtime.wasmExit": (sp) => { "runtime.wasmExit": (sp) => {
const code = mem().getInt32(sp + 8, true); const code = this.mem.getInt32(sp + 8, true);
this.exited = true; this.exited = true;
delete this._inst; delete this._inst;
delete this._values; delete this._values;
delete this._refs; delete this._goRefCounts;
delete this._ids;
delete this._idPool;
this.exit(code); this.exit(code);
}, },
@ -247,20 +278,25 @@
"runtime.wasmWrite": (sp) => { "runtime.wasmWrite": (sp) => {
const fd = getInt64(sp + 8); const fd = getInt64(sp + 8);
const p = getInt64(sp + 16); const p = getInt64(sp + 16);
const n = mem().getInt32(sp + 24, true); const n = this.mem.getInt32(sp + 24, true);
fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n)); fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
}, },
// func nanotime() int64 // func resetMemoryDataView()
"runtime.nanotime": (sp) => { "runtime.resetMemoryDataView": (sp) => {
this.mem = new DataView(this._inst.exports.mem.buffer);
},
// func nanotime1() int64
"runtime.nanotime1": (sp) => {
setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000); setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
}, },
// func walltime() (sec int64, nsec int32) // func walltime1() (sec int64, nsec int32)
"runtime.walltime": (sp) => { "runtime.walltime1": (sp) => {
const msec = (new Date).getTime(); const msec = (new Date).getTime();
setInt64(sp + 8, msec / 1000); setInt64(sp + 8, msec / 1000);
mem().setInt32(sp + 16, (msec % 1000) * 1000000, true); this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
}, },
// func scheduleTimeoutEvent(delay int64) int32 // func scheduleTimeoutEvent(delay int64) int32
@ -279,12 +315,12 @@
}, },
getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
)); ));
mem().setInt32(sp + 16, id, true); this.mem.setInt32(sp + 16, id, true);
}, },
// func clearTimeoutEvent(id int32) // func clearTimeoutEvent(id int32)
"runtime.clearTimeoutEvent": (sp) => { "runtime.clearTimeoutEvent": (sp) => {
const id = mem().getInt32(sp + 8, true); const id = this.mem.getInt32(sp + 8, true);
clearTimeout(this._scheduledTimeouts.get(id)); clearTimeout(this._scheduledTimeouts.get(id));
this._scheduledTimeouts.delete(id); this._scheduledTimeouts.delete(id);
}, },
@ -294,6 +330,18 @@
crypto.getRandomValues(loadSlice(sp + 8)); crypto.getRandomValues(loadSlice(sp + 8));
}, },
// func finalizeRef(v ref)
"syscall/js.finalizeRef": (sp) => {
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 // func stringVal(value string) ref
"syscall/js.stringVal": (sp) => { "syscall/js.stringVal": (sp) => {
storeValue(sp + 24, loadString(sp + 8)); storeValue(sp + 24, loadString(sp + 8));
@ -311,6 +359,11 @@
Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32)); Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
}, },
// func valueDelete(v ref, p string)
"syscall/js.valueDelete": (sp) => {
Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
},
// func valueIndex(v ref, i int) ref // func valueIndex(v ref, i int) ref
"syscall/js.valueIndex": (sp) => { "syscall/js.valueIndex": (sp) => {
storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16))); storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
@ -330,10 +383,10 @@
const result = Reflect.apply(m, v, args); const result = Reflect.apply(m, v, args);
sp = this._inst.exports.getsp(); // see comment above sp = this._inst.exports.getsp(); // see comment above
storeValue(sp + 56, result); storeValue(sp + 56, result);
mem().setUint8(sp + 64, 1); this.mem.setUint8(sp + 64, 1);
} catch (err) { } catch (err) {
storeValue(sp + 56, err); storeValue(sp + 56, err);
mem().setUint8(sp + 64, 0); this.mem.setUint8(sp + 64, 0);
} }
}, },
@ -345,10 +398,10 @@
const result = Reflect.apply(v, undefined, args); const result = Reflect.apply(v, undefined, args);
sp = this._inst.exports.getsp(); // see comment above sp = this._inst.exports.getsp(); // see comment above
storeValue(sp + 40, result); storeValue(sp + 40, result);
mem().setUint8(sp + 48, 1); this.mem.setUint8(sp + 48, 1);
} catch (err) { } catch (err) {
storeValue(sp + 40, err); storeValue(sp + 40, err);
mem().setUint8(sp + 48, 0); this.mem.setUint8(sp + 48, 0);
} }
}, },
@ -360,10 +413,10 @@
const result = Reflect.construct(v, args); const result = Reflect.construct(v, args);
sp = this._inst.exports.getsp(); // see comment above sp = this._inst.exports.getsp(); // see comment above
storeValue(sp + 40, result); storeValue(sp + 40, result);
mem().setUint8(sp + 48, 1); this.mem.setUint8(sp + 48, 1);
} catch (err) { } catch (err) {
storeValue(sp + 40, err); storeValue(sp + 40, err);
mem().setUint8(sp + 48, 0); this.mem.setUint8(sp + 48, 0);
} }
}, },
@ -387,7 +440,7 @@
// func valueInstanceOf(v ref, t ref) bool // func valueInstanceOf(v ref, t ref) bool
"syscall/js.valueInstanceOf": (sp) => { "syscall/js.valueInstanceOf": (sp) => {
mem().setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16)); this.mem.setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16));
}, },
// func copyBytesToGo(dst []byte, src ref) (int, bool) // func copyBytesToGo(dst []byte, src ref) (int, bool)
@ -395,13 +448,13 @@
const dst = loadSlice(sp + 8); const dst = loadSlice(sp + 8);
const src = loadValue(sp + 32); const src = loadValue(sp + 32);
if (!(src instanceof Uint8Array)) { if (!(src instanceof Uint8Array)) {
mem().setUint8(sp + 48, 0); this.mem.setUint8(sp + 48, 0);
return; return;
} }
const toCopy = src.subarray(0, dst.length); const toCopy = src.subarray(0, dst.length);
dst.set(toCopy); dst.set(toCopy);
setInt64(sp + 40, toCopy.length); setInt64(sp + 40, toCopy.length);
mem().setUint8(sp + 48, 1); this.mem.setUint8(sp + 48, 1);
}, },
// func copyBytesToJS(dst ref, src []byte) (int, bool) // func copyBytesToJS(dst ref, src []byte) (int, bool)
@ -409,13 +462,13 @@
const dst = loadValue(sp + 8); const dst = loadValue(sp + 8);
const src = loadSlice(sp + 16); const src = loadSlice(sp + 16);
if (!(dst instanceof Uint8Array)) { if (!(dst instanceof Uint8Array)) {
mem().setUint8(sp + 48, 0); this.mem.setUint8(sp + 48, 0);
return; return;
} }
const toCopy = src.subarray(0, dst.length); const toCopy = src.subarray(0, dst.length);
dst.set(toCopy); dst.set(toCopy);
setInt64(sp + 40, toCopy.length); setInt64(sp + 40, toCopy.length);
mem().setUint8(sp + 48, 1); this.mem.setUint8(sp + 48, 1);
}, },
"debug": (value) => { "debug": (value) => {
@ -427,7 +480,8 @@
async run(instance) { async run(instance) {
this._inst = instance; this._inst = instance;
this._values = [ // TODO: garbage collection this.mem = new DataView(this._inst.exports.mem.buffer);
this._values = [ // JS values that Go currently has references to, indexed by reference id
NaN, NaN,
0, 0,
null, null,
@ -436,10 +490,10 @@
global, global,
this, this,
]; ];
this._refs = new Map(); this._goRefCounts = []; // number of references that Go has to a JS value, indexed by reference id
this.exited = false; this._ids = new Map(); // mapping from JS values to reference ids
this._idPool = []; // unused ids that have been garbage collected
const mem = new DataView(this._inst.exports.mem.buffer) 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. // Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
let offset = 4096; let offset = 4096;
@ -447,7 +501,7 @@
const strPtr = (str) => { const strPtr = (str) => {
const ptr = offset; const ptr = offset;
const bytes = encoder.encode(str + "\0"); const bytes = encoder.encode(str + "\0");
new Uint8Array(mem.buffer, offset, bytes.length).set(bytes); new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
offset += bytes.length; offset += bytes.length;
if (offset % 8 !== 0) { if (offset % 8 !== 0) {
offset += 8 - (offset % 8); offset += 8 - (offset % 8);
@ -461,17 +515,18 @@
this.argv.forEach((arg) => { this.argv.forEach((arg) => {
argvPtrs.push(strPtr(arg)); argvPtrs.push(strPtr(arg));
}); });
argvPtrs.push(0);
const keys = Object.keys(this.env).sort(); const keys = Object.keys(this.env).sort();
argvPtrs.push(keys.length);
keys.forEach((key) => { keys.forEach((key) => {
argvPtrs.push(strPtr(`${key}=${this.env[key]}`)); argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
}); });
argvPtrs.push(0);
const argv = offset; const argv = offset;
argvPtrs.forEach((ptr) => { argvPtrs.forEach((ptr) => {
mem.setUint32(offset, ptr, true); this.mem.setUint32(offset, ptr, true);
mem.setUint32(offset + 4, 0, true); this.mem.setUint32(offset + 4, 0, true);
offset += 8; offset += 8;
}); });