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LibJS: Setup host hooks and have promise jobs work out the realm

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This allows the host of LibJS (notably LibWeb in this case) to override
certain functions such as HostEnqueuePromiseJob, so it can do it's own
thing in certain situations. Notably, LibWeb will override
HostEnqueuePromiseJob to put promise jobs on the microtask queue.

This also makes promise jobs use AK::Function instead of
JS::NativeFunction. This removes the need to go through a JavaScript
function and it more closely matches the spec's idea of "abstract
closures"
This commit is contained in:
Luke Wilde 2022-02-06 03:46:45 +00:00 • committed by Linus Groh
parent 5aacec65ab
commit 4c1c6ef91c
12 changed files with 202 additions and 172 deletions
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12
Userland/Libraries/LibJS/Runtime/FinalizationRegistryConstructor.cpp
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@ -9,6 +9,7 @@
#include <LibJS/Runtime/FinalizationRegistry.h>
#include <LibJS/Runtime/FinalizationRegistryConstructor.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/JobCallback.h>
namespace JS {
@ -45,11 +46,20 @@ ThrowCompletionOr<Object*> FinalizationRegistryConstructor::construct(FunctionOb
auto& vm = this->vm();
auto& global_object = this->global_object();
// NOTE: Step 1 is implemented in FinalizationRegistryConstructor::call()
// 2. If IsCallable(cleanupCallback) is false, throw a TypeError exception.
auto cleanup_callback = vm.argument(0);
if (!cleanup_callback.is_function())
return vm.throw_completion<TypeError>(global_object, ErrorType::NotAFunction, cleanup_callback.to_string_without_side_effects());
return TRY(ordinary_create_from_constructor<FinalizationRegistry>(global_object, new_target, &GlobalObject::finalization_registry_prototype, cleanup_callback.as_function()));
// 3. Let finalizationRegistry be ? OrdinaryCreateFromConstructor(NewTarget, "%FinalizationRegistry.prototype%", « [[Realm]], [[CleanupCallback]], [[Cells]] »).
// 4. Let fn be the active function object. (NOTE: Not necessary. The active function object is `this`)
// 5. Set finalizationRegistry.[[Realm]] to fn.[[Realm]].
// 6. Set finalizationRegistry.[[CleanupCallback]] to HostMakeJobCallback(cleanupCallback).
// 7. Set finalizationRegistry.[[Cells]] to a new empty List. (NOTE: This is done inside FinalizationRegistry instead of here)
// 8. Return finalizationRegistry.
return TRY(ordinary_create_from_constructor<FinalizationRegistry>(global_object, new_target, &GlobalObject::finalization_registry_prototype, *realm(), vm.host_make_job_callback(cleanup_callback.as_function())));
}
}