mirror of
https://github.com/tursodatabase/libsql.git
synced 2024-12-16 05:38:47 +00:00
111 lines
3.8 KiB
JavaScript
111 lines
3.8 KiB
JavaScript
/**
|
|
BEGIN FILE: api/pre-js.js
|
|
|
|
This file is intended to be prepended to the sqlite3.js build using
|
|
Emscripten's --pre-js=THIS_FILE flag (or equivalent).
|
|
*/
|
|
|
|
// See notes in extern-post-js.js
|
|
const sqlite3InitModuleState = globalThis.sqlite3InitModuleState
|
|
|| Object.assign(Object.create(null),{
|
|
debugModule: ()=>{}
|
|
});
|
|
delete globalThis.sqlite3InitModuleState;
|
|
sqlite3InitModuleState.debugModule('globalThis.location =',globalThis.location);
|
|
|
|
//#ifnot target=es6-bundler-friendly
|
|
/**
|
|
This custom locateFile() tries to figure out where to load `path`
|
|
from. The intent is to provide a way for foo/bar/X.js loaded from a
|
|
Worker constructor or importScripts() to be able to resolve
|
|
foo/bar/X.wasm (in the latter case, with some help):
|
|
|
|
1) If URL param named the same as `path` is set, it is returned.
|
|
|
|
2) If sqlite3InitModuleState.sqlite3Dir is set, then (thatName + path)
|
|
is returned (note that it's assumed to end with '/').
|
|
|
|
3) If this code is running in the main UI thread AND it was loaded
|
|
from a SCRIPT tag, the directory part of that URL is used
|
|
as the prefix. (This form of resolution unfortunately does not
|
|
function for scripts loaded via importScripts().)
|
|
|
|
4) If none of the above apply, (prefix+path) is returned.
|
|
*/
|
|
Module['locateFile'] = function(path, prefix) {
|
|
//#if target=es6-module
|
|
return new URL(path, import.meta.url).href;
|
|
//#else
|
|
'use strict';
|
|
let theFile;
|
|
const up = this.urlParams;
|
|
if(up.has(path)){
|
|
theFile = up.get(path);
|
|
}else if(this.sqlite3Dir){
|
|
theFile = this.sqlite3Dir + path;
|
|
}else if(this.scriptDir){
|
|
theFile = this.scriptDir + path;
|
|
}else{
|
|
theFile = prefix + path;
|
|
}
|
|
sqlite3InitModuleState.debugModule(
|
|
"locateFile(",arguments[0], ',', arguments[1],")",
|
|
'sqlite3InitModuleState.scriptDir =',this.scriptDir,
|
|
'up.entries() =',Array.from(up.entries()),
|
|
"result =", theFile
|
|
);
|
|
return theFile;
|
|
//#endif target=es6-module
|
|
}.bind(sqlite3InitModuleState);
|
|
//#endif ifnot target=es6-bundler-friendly
|
|
|
|
/**
|
|
Bug warning: a custom Module.instantiateWasm() does not work
|
|
in WASMFS builds:
|
|
|
|
https://github.com/emscripten-core/emscripten/issues/17951
|
|
|
|
In such builds we must disable this.
|
|
*/
|
|
const xNameOfInstantiateWasm = false
|
|
? 'instantiateWasm'
|
|
: 'emscripten-bug-17951';
|
|
Module[xNameOfInstantiateWasm] = function callee(imports,onSuccess){
|
|
imports.env.foo = function(){};
|
|
const uri = Module.locateFile(
|
|
callee.uri, (
|
|
('undefined'===typeof scriptDirectory/*var defined by Emscripten glue*/)
|
|
? "" : scriptDirectory)
|
|
);
|
|
sqlite3InitModuleState.debugModule(
|
|
"instantiateWasm() uri =", uri
|
|
);
|
|
const wfetch = ()=>fetch(uri, {credentials: 'same-origin'});
|
|
const loadWasm = WebAssembly.instantiateStreaming
|
|
? async ()=>{
|
|
return WebAssembly.instantiateStreaming(wfetch(), imports)
|
|
.then((arg)=>onSuccess(arg.instance, arg.module));
|
|
}
|
|
: async ()=>{ // Safari < v15
|
|
return wfetch()
|
|
.then(response => response.arrayBuffer())
|
|
.then(bytes => WebAssembly.instantiate(bytes, imports))
|
|
.then((arg)=>onSuccess(arg.instance, arg.module));
|
|
};
|
|
loadWasm();
|
|
return {};
|
|
};
|
|
/*
|
|
It is literally impossible to reliably get the name of _this_ script
|
|
at runtime, so impossible to derive X.wasm from script name
|
|
X.js. Thus we need, at build-time, to redefine
|
|
Module[xNameOfInstantiateWasm].uri by appending it to a build-specific
|
|
copy of this file with the name of the wasm file. This is apparently
|
|
why Emscripten hard-codes the name of the wasm file into their glue
|
|
scripts.
|
|
*/
|
|
Module[xNameOfInstantiateWasm].uri = 'sqlite3.wasm';
|
|
/* END FILE: api/pre-js.js, noting that the build process may add a
|
|
line after this one to change the above .uri to a build-specific
|
|
one. */
|