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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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16
Userland/Libraries/LibJS/Runtime/VM.h
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@ -176,16 +176,16 @@ public:
CommonPropertyNames names;
void run_queued_promise_jobs();
void enqueue_promise_job(NativeFunction&);
void enqueue_promise_job(Function<ThrowCompletionOr<Value>()> job, Realm*);
void run_queued_finalization_registry_cleanup_jobs();
void enqueue_finalization_registry_cleanup_job(FinalizationRegistry&);
void promise_rejection_tracker(const Promise&, Promise::RejectionOperation) const;
void promise_rejection_tracker(Promise&, Promise::RejectionOperation) const;
Function<void()> on_call_stack_emptied;
Function<void(const Promise&)> on_promise_unhandled_rejection;
Function<void(const Promise&)> on_promise_rejection_handled;
Function<void(Promise&)> on_promise_unhandled_rejection;
Function<void(Promise&)> on_promise_rejection_handled;
ThrowCompletionOr<void> initialize_instance_elements(Object& object, ECMAScriptFunctionObject& constructor);
@ -216,6 +216,12 @@ public:
void enable_default_host_import_module_dynamically_hook();
Function<void(Promise&, Promise::RejectionOperation)> host_promise_rejection_tracker;
Function<ThrowCompletionOr<Value>(GlobalObject&, JobCallback&, Value, MarkedValueList)> host_call_job_callback;
Function<void(FinalizationRegistry&)> host_enqueue_finalization_registry_cleanup_job;
Function<void(Function<ThrowCompletionOr<Value>()>, Realm*)> host_enqueue_promise_job;
Function<JobCallback(FunctionObject&)> host_make_job_callback;
private:
explicit VM(OwnPtr<CustomData>);
@ -241,7 +247,7 @@ private:
HashMap<String, Symbol*> m_global_symbol_map;
Vector<NativeFunction*> m_promise_jobs;
Vector<Function<ThrowCompletionOr<Value>()>> m_promise_jobs;
Vector<FinalizationRegistry*> m_finalization_registry_cleanup_jobs;