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LibJS: Implement await properly for async functions

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Fixes #20275

```
Summary:
    Diff Tests:
        +4 ✅    -4 ❌   

Diff Tests:
    test/built-ins/Array/fromAsync/non-iterable-input-with-thenable
    -async-mapped-awaits-callback-result-once.js ❌ -> ✅
    test/language/expressions/await/async-await-interleaved.js ❌ -> ✅
    test/language/expressions/await/await-awaits-thenables-that-
    throw.js ❌ -> ✅
    test/language/expressions/await/await-awaits-thenables.js ❌ -> ✅
```
This commit is contained in:
Luke Wilde
2023-08-09 22:12:07 +01:00
committed by Andreas Kling
parent 5003b1a421
commit ae7a0c43a9
Notes: sideshowbarker 2024-07-16 20:21:48 +09:00 
Author: https://github.com/Lubrsi
Commit: https://github.com/SerenityOS/serenity/commit/ae7a0c43a9
Pull-request: https://github.com/SerenityOS/serenity/pull/20465
Issue: https://github.com/SerenityOS/serenity/issues/20275
5 changed files with 175 additions and 69 deletions
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12
Userland/Libraries/LibJS/Runtime/AsyncFunctionDriverWrapper.h
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@@ -18,23 +18,27 @@ class AsyncFunctionDriverWrapper final : public Promise {
JS_OBJECT(AsyncFunctionDriverWrapper, Promise);
public:
enum class IsInitialExecution {
No,
Yes,
};
static ThrowCompletionOr<Value> create(Realm&, GeneratorObject*);
virtual ~AsyncFunctionDriverWrapper() override = default;
void visit_edges(Cell::Visitor&) override;
void continue_async_execution(VM&, Value, bool is_successful);
void continue_async_execution(VM&, Value, bool is_successful, IsInitialExecution is_initial_execution = IsInitialExecution::No);
private:
AsyncFunctionDriverWrapper(Realm&, NonnullGCPtr<GeneratorObject>, NonnullGCPtr<Promise> top_level_promise);
ThrowCompletionOr<void> await(Value);
bool m_expect_promise { false };
NonnullGCPtr<GeneratorObject> m_generator_object;
NonnullGCPtr<NativeFunction> m_on_fulfillment;
NonnullGCPtr<NativeFunction> m_on_rejection;
NonnullGCPtr<Promise> m_top_level_promise;
GCPtr<Promise> m_current_promise { nullptr };
Handle<AsyncFunctionDriverWrapper> m_self_handle;
Optional<ExecutionContext> m_suspended_execution_context;
};
}