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Add JS infrastructure to ostensibly allow us to customize the wasm imports, which will hypothetically allow us to eliminate the dependency on EM_JS(), but the corresponding Emscripten glue-level feature currently breaks fatally with WASMFS builds so it's disabled.

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FossilOrigin-Name: 88d9253b0db5494bf1c9b6d24f22524eeec856b89e64a66ffb30d945f0df21d3
This commit is contained in:
stephan
2022-09-29 22:08:22 +00:00
parent b0ccf50cbd
commit f71c954cbc
11 changed files with 123 additions and 36 deletions
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2
ext/wasm/api/extern-post-js.js
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@ -1,4 +1,4 @@
/* emscripten-js-addenda.js must be appended to the resulting sqlite3.js
/* extern-post-js.js must be appended to the resulting sqlite3.js
file. */
(function(){
/**

4
ext/wasm/api/extern-pre-js.js Normal file
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/* extern-pre-js.js must be prepended to the resulting sqlite3.js
file. This file is currently only used for holding snippets during
test and development.
*/

40
ext/wasm/api/pre-js.js Normal file
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Module['locateFile'] = function(path, prefix) {
return prefix + path;
};
/**
Bug warning: this xInstantiateWasm bit must remain disabled
until this bug is resolved or wasmfs won't work:
https://github.com/emscripten-core/emscripten/issues/17951
*/
const xInstantiateWasm = 1
? 'emscripten-bug-17951'
: 'instantiateWasm';
Module[xInstantiateWasm] = function callee(imports,onSuccess){
imports.foo = function(){};
console.warn("instantiateWasm() uri =",callee.uri, self.location.href);
const wfetch = ()=>fetch(callee.uri, {credentials: 'same-origin'});
const loadWasm = WebAssembly.instantiateStreaming
? function loadWasmStreaming(){
return WebAssembly.instantiateStreaming(wfetch(), imports)
.then((arg)=>onSuccess(arg.instance, arg.module));
}
: function loadWasmOldSchool(){ // 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 get the name of a Worker's own script,
so impossible to derive X.wasm from script name X.js. Thus we need,
at build-time, to redifine Module['instantiateWasm'].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[xInstantiateWasm].uri = 'sqlite3.wasm';