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LibJS: Add successfully loaded modules to the VM's stored module list

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This ensures that repeated loads of the same module succeed. (There is a
specific criteria where the same exact module object has to be returned
for multiple loads of the same referrer + specifier.)

Note that we don't check the referrer at the moment, that's a FIXME.
This commit is contained in:
Andreas Kling 2023-12-03 14:22:05 +01:00
parent 99106df834
commit 58294db294
1 changed files with 14 additions and 6 deletions
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20
Userland/Libraries/LibJS/Runtime/VM.cpp
View file

@ -723,15 +723,16 @@ ScriptOrModule VM::get_active_script_or_module() const
VM::StoredModule* VM::get_stored_module(ImportedModuleReferrer const&, DeprecatedString const& filename, DeprecatedString const&)
{
// Note the spec says:
// Each time this operation is called with a specific referencingScriptOrModule, specifier pair as arguments
// it must return the same Module Record instance if it completes normally.
// Currently, we ignore the referencing script or module but this might not be correct in all cases.
// If this operation is called multiple times with the same (referrer, specifier) pair and it performs
// FinishLoadingImportedModule(referrer, specifier, payload, result) where result is a normal completion,
// then it must perform FinishLoadingImportedModule(referrer, specifier, payload, result) with the same result each time.
// Editor's Note from https://tc39.es/proposal-json-modules/#sec-hostresolveimportedmodule
// The above text implies that is recommended but not required that hosts do not use moduleRequest.[[Assertions]]
// as part of the module cache key. In either case, an exception thrown from an import with a given assertion list
// does not rule out success of another import with the same specifier but a different assertion list.
// FIXME: This should probably check referrer as well.
auto end_or_module = m_loaded_modules.find_if([&](StoredModule const& stored_module) {
return stored_module.filename == filename;
});
@ -950,10 +951,17 @@ void VM::load_imported_module(ImportedModuleReferrer referrer, ModuleRequest con
VERIFY(module_or_errors.error().size() > 0);
return throw_completion<SyntaxError>(module_or_errors.error().first().to_deprecated_string());
}
return module_or_errors.release_value();
}();
dbgln_if(JS_MODULE_DEBUG, "[JS MODULE] load_imported_module(...) parsed {} to {}", filename, module);
auto module = module_or_errors.release_value();
m_loaded_modules.empend(
referrer,
module->filename(),
DeprecatedString {}, // Null type
make_handle<Module>(*module),
true);
return module;
}();
finish_loading_imported_module(referrer, module_request, payload, module);
}