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Add a few todos.

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This commit is contained in:
JF Bastien 2016-01-30 14:12:19 -08:00
parent f11387c0bb
commit ae7274db9b
1 changed files with 14 additions and 4 deletions
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18
arch/wasm32/wasm.js
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@ -17,7 +17,8 @@
/*
* Support JavaScript code to run WebAssembly in a JavaScript shell.
*
* This is a giant hack which stands in for a real libc and runtime.
* This is a giant hack which stands in for a real libc and runtime. It acts
* both as a hobbling libc and a linker/loader, including dynamic linking.
*/
var HEAP_SIZE_BYTES = 1 << 20;
@ -810,6 +811,7 @@ var musl_hack = (function() {
// Syscall API with C libraries. In theory this is the only JavaScript
// implementation we need.
var syscall = (function() {
// TODO auto-generate syscall number from the header.
return {
__syscall0: function(n) { print('syscall(' + n + ')'); return -1; },
__syscall1: function(n, a) {
@ -857,13 +859,21 @@ var ffi = (function() {
if (arguments.length < 1)
throw new Error('Expected at least one wasm module to load.');
function load_wasm(file_path) {
// TODO this should be split up in load, check dependencies, and then resolve
// dependencies. That would make it easier to do lazy loading. We could do
// this by catching load exceptions + adding to ffi and trying again, but
// we're talking silly there: modules should just tell us what they want.
return _WASMEXP_.instantiateModule(readbuffer(file_path), ffi, heap);
}
// Load modules in reverse, adding their exports to the ffi object.
// This is analogous to how the linker resolves symbols: the later modules
// export symbols used by the earlier modules.
// export symbols used by the earlier modules, and allow shadowing.
// Note that all modules, as well as the main module, share a heap.
var modules = {};
for (var i = arguments.length - 1; i > 0; --i) {
modules[i] = _WASMEXP_.instantiateModule(readbuffer(arguments[i]), ffi, heap);
modules[i] = load_wasm(arguments[i]);
for (var f in modules[i]) {
if (modules[i].hasOwnProperty(f) && modules[i][f] instanceof Function)
ffi[f] = modules[i][f];
@ -871,7 +881,7 @@ for (var i = arguments.length - 1; i > 0; --i) {
}
// Load the main module once the ffi object has been fully populated.
modules[0] = _WASMEXP_.instantiateModule(readbuffer(arguments[0]), ffi, heap);
modules[0] = load_wasm(arguments[0]);
// TODO check that `main` exists in modules[0] and error out if not.