@convex-dev/geospatial
Version:
A geospatial index for Convex
360 lines • 15.8 kB
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.
//
// This file has been modified for use by the TinyGo compiler.
const encoder = new TextEncoder();
const decoder = new TextDecoder("utf-8");
const reinterpretBuf = new DataView(new ArrayBuffer(8));
let logLine = [];
export class Go {
importObject;
_inst;
_values;
_goRefCounts;
_ids;
_idPool;
exited;
_resolveExitPromise;
_resolveCallbackPromise;
_pendingEvent;
_callbackTimeouts;
_nextCallbackTimeoutID;
constructor() {
this._callbackTimeouts = new Map();
this._nextCallbackTimeoutID = 1;
const mem = () => {
// The buffer may change when requesting more memory.
return new DataView(this._inst.exports.memory.buffer);
};
const unboxValue = (v_ref) => {
reinterpretBuf.setBigInt64(0, v_ref, true);
const f = reinterpretBuf.getFloat64(0, true);
if (f === 0) {
return undefined;
}
if (!isNaN(f)) {
return f;
}
const id = v_ref & 0xffffffffn;
return this._values[id];
};
const loadValue = (addr) => {
const v_ref = mem().getBigUint64(addr, true);
return unboxValue(v_ref);
};
const boxValue = (v) => {
const nanHead = 0x7ff80000n;
if (typeof v === "number") {
if (isNaN(v)) {
return nanHead << 32n;
}
if (v === 0) {
return (nanHead << 32n) | 1n;
}
reinterpretBuf.setFloat64(0, v, true);
return reinterpretBuf.getBigInt64(0, true);
}
switch (v) {
case undefined:
return 0n;
case null:
return (nanHead << 32n) | 2n;
case true:
return (nanHead << 32n) | 3n;
case false:
return (nanHead << 32n) | 4n;
}
let id = this._ids.get(v);
if (id === undefined) {
id = this._idPool.pop();
if (id === undefined) {
id = BigInt(this._values.length);
}
this._values[id] = v;
this._goRefCounts[id] = 0;
this._ids.set(v, id);
}
this._goRefCounts[id]++;
let typeFlag = 1n;
switch (typeof v) {
case "string":
typeFlag = 2n;
break;
case "symbol":
typeFlag = 3n;
break;
case "function":
typeFlag = 4n;
break;
}
return id | ((nanHead | typeFlag) << 32n);
};
const storeValue = (addr, v) => {
const v_ref = boxValue(v);
mem().setBigUint64(addr, v_ref, true);
};
const loadSlice = (array, len, _cap) => {
return new Uint8Array(this._inst.exports.memory.buffer, array, len);
};
const loadSliceOfValues = (array, len, _cap) => {
const a = new Array(len);
for (let i = 0; i < len; i++) {
a[i] = loadValue(array + i * 8);
}
return a;
};
const loadString = (ptr, len) => {
return decoder.decode(new DataView(this._inst.exports.memory.buffer, ptr, len));
};
this.importObject = {
wasi_snapshot_preview1: {
// https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#fd_write
fd_write: function (fd, iovs_ptr, iovs_len, nwritten_ptr) {
let nwritten = 0;
if (fd == 1) {
for (let iovs_i = 0; iovs_i < iovs_len; iovs_i++) {
const iov_ptr = iovs_ptr + iovs_i * 8; // assuming wasm32
const ptr = mem().getUint32(iov_ptr + 0, true);
const len = mem().getUint32(iov_ptr + 4, true);
nwritten += len;
for (let i = 0; i < len; i++) {
const c = mem().getUint8(ptr + i);
if (c == 13) {
// CR
// ignore
}
else if (c == 10) {
// LF
// write line
const line = decoder.decode(new Uint8Array(logLine));
logLine = [];
console.log(line);
}
else {
logLine.push(c);
}
}
}
}
else {
console.error("invalid file descriptor:", fd);
}
mem().setUint32(nwritten_ptr, nwritten, true);
return 0;
},
fd_close: () => 0, // dummy
fd_fdstat_get: () => 0, // dummy
fd_seek: () => 0, // dummy
proc_exit: (code) => {
// Can't exit in a browser.
throw "trying to exit with code " + code;
},
random_get: (bufPtr, bufLen) => {
crypto.getRandomValues(loadSlice(bufPtr, bufLen));
return 0;
},
},
gojs: {
// func ticks() float64
"runtime.ticks": () => {
return Date.now();
},
// func sleepTicks(timeout float64)
"runtime.sleepTicks": (timeout) => {
// Do not sleep, only reactivate scheduler after the given timeout.
setTimeout(this._inst.exports.go_scheduler, timeout);
},
// func finalizeRef(v ref)
"syscall/js.finalizeRef": (_v_ref) => {
// Note: TinyGo does not support finalizers so this should never be
// called.
console.error("syscall/js.finalizeRef not implemented");
},
// func stringVal(value string) ref
"syscall/js.stringVal": (value_ptr, value_len) => {
const s = loadString(value_ptr, value_len);
return boxValue(s);
},
// func valueGet(v ref, p string) ref
"syscall/js.valueGet": (v_ref, p_ptr, p_len) => {
const prop = loadString(p_ptr, p_len);
const v = unboxValue(v_ref);
const result = Reflect.get(v, prop);
return boxValue(result);
},
// func valueSet(v ref, p string, x ref)
"syscall/js.valueSet": (v_ref, p_ptr, p_len, x_ref) => {
const v = unboxValue(v_ref);
const p = loadString(p_ptr, p_len);
const x = unboxValue(x_ref);
Reflect.set(v, p, x);
},
// func valueDelete(v ref, p string)
"syscall/js.valueDelete": (v_ref, p_ptr, p_len) => {
const v = unboxValue(v_ref);
const p = loadString(p_ptr, p_len);
Reflect.deleteProperty(v, p);
},
// func valueIndex(v ref, i int) ref
"syscall/js.valueIndex": (v_ref, i) => {
return boxValue(Reflect.get(unboxValue(v_ref), i));
},
// valueSetIndex(v ref, i int, x ref)
"syscall/js.valueSetIndex": (v_ref, i, x_ref) => {
Reflect.set(unboxValue(v_ref), i, unboxValue(x_ref));
},
// func valueCall(v ref, m string, args []ref) (ref, bool)
"syscall/js.valueCall": (ret_addr, v_ref, m_ptr, m_len, args_ptr, args_len, args_cap) => {
const v = unboxValue(v_ref);
const name = loadString(m_ptr, m_len);
const args = loadSliceOfValues(args_ptr, args_len, args_cap);
try {
const m = Reflect.get(v, name);
storeValue(ret_addr, Reflect.apply(m, v, args));
mem().setUint8(ret_addr + 8, 1);
}
catch (err) {
storeValue(ret_addr, err);
mem().setUint8(ret_addr + 8, 0);
}
},
// func valueInvoke(v ref, args []ref) (ref, bool)
"syscall/js.valueInvoke": (ret_addr, v_ref, args_ptr, args_len, args_cap) => {
try {
const v = unboxValue(v_ref);
const args = loadSliceOfValues(args_ptr, args_len, args_cap);
storeValue(ret_addr, Reflect.apply(v, undefined, args));
mem().setUint8(ret_addr + 8, 1);
}
catch (err) {
storeValue(ret_addr, err);
mem().setUint8(ret_addr + 8, 0);
}
},
// func valueNew(v ref, args []ref) (ref, bool)
"syscall/js.valueNew": (ret_addr, v_ref, args_ptr, args_len, args_cap) => {
const v = unboxValue(v_ref);
const args = loadSliceOfValues(args_ptr, args_len, args_cap);
try {
storeValue(ret_addr, Reflect.construct(v, args));
mem().setUint8(ret_addr + 8, 1);
}
catch (err) {
storeValue(ret_addr, err);
mem().setUint8(ret_addr + 8, 0);
}
},
// func valueLength(v ref) int
"syscall/js.valueLength": (v_ref) => {
return unboxValue(v_ref).length;
},
// valuePrepareString(v ref) (ref, int)
"syscall/js.valuePrepareString": (ret_addr, v_ref) => {
const s = String(unboxValue(v_ref));
const str = encoder.encode(s);
storeValue(ret_addr, str);
mem().setInt32(ret_addr + 8, str.length, true);
},
// valueLoadString(v ref, b []byte)
"syscall/js.valueLoadString": (v_ref, slice_ptr, slice_len, slice_cap) => {
const str = unboxValue(v_ref);
loadSlice(slice_ptr, slice_len, slice_cap).set(str);
},
// func valueInstanceOf(v ref, t ref) bool
"syscall/js.valueInstanceOf": (v_ref, t_ref) => {
return unboxValue(v_ref) instanceof unboxValue(t_ref);
},
// func copyBytesToGo(dst []byte, src ref) (int, bool)
"syscall/js.copyBytesToGo": (ret_addr, dest_addr, dest_len, dest_cap, src_ref) => {
const num_bytes_copied_addr = ret_addr;
const returned_status_addr = ret_addr + 4; // Address of returned boolean status variable
const dst = loadSlice(dest_addr, dest_len);
const src = unboxValue(src_ref);
if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
mem().setUint8(returned_status_addr, 0); // Return "not ok" status
return;
}
const toCopy = src.subarray(0, dst.length);
dst.set(toCopy);
mem().setUint32(num_bytes_copied_addr, toCopy.length, true);
mem().setUint8(returned_status_addr, 1); // Return "ok" status
},
// copyBytesToJS(dst ref, src []byte) (int, bool)
// Originally copied from upstream Go project, then modified:
// https://github.com/golang/go/blob/3f995c3f3b43033013013e6c7ccc93a9b1411ca9/misc/wasm/wasm_exec.js#L404-L416
"syscall/js.copyBytesToJS": (ret_addr, dst_ref, src_addr, src_len, _src_cap) => {
const num_bytes_copied_addr = ret_addr;
const returned_status_addr = ret_addr + 4; // Address of returned boolean status variable
const dst = unboxValue(dst_ref);
const src = loadSlice(src_addr, src_len);
if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
mem().setUint8(returned_status_addr, 0); // Return "not ok" status
return;
}
const toCopy = src.subarray(0, dst.length);
dst.set(toCopy);
mem().setUint32(num_bytes_copied_addr, toCopy.length, true);
mem().setUint8(returned_status_addr, 1); // Return "ok" status
},
},
};
// Go 1.20 uses 'env'. Go 1.21 uses 'gojs'.
// For compatibility, we use both as long as Go 1.20 is supported.
this.importObject.env = this.importObject.gojs;
}
async run(instance) {
this._inst = instance;
this._values = [
// JS values that Go currently has references to, indexed by reference id
NaN,
0,
null,
true,
false,
globalThis,
this,
];
this._goRefCounts = []; // 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
this._idPool = []; // unused ids that have been garbage collected
this.exited = false; // whether the Go program has exited
// 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
// };
// });
// console.log(this._inst)
// this._inst.exports._start();
// if (this.exited) {
// break;
// }
// await callbackPromise;
// }
this._inst.exports._start();
}
_resume() {
if (this.exited) {
throw new Error("Go program has already exited");
}
this._inst.exports.resume();
if (this.exited) {
this._resolveExitPromise();
}
}
_makeFuncWrapper(id) {
// eslint-disable-next-line @typescript-eslint/no-this-alias
const go = this;
return function (...args) {
const event = { id: id, this: this, args };
go._pendingEvent = event;
go._resume();
return event.result;
};
}
}
//# sourceMappingURL=goRuntime.js.map