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