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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"
42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
/*
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* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/FunctionObject.h>
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namespace JS {
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// 9.5.1 JobCallback Records, https://tc39.es/ecma262/#sec-jobcallback-records
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struct JobCallback {
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struct CustomData {
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virtual ~CustomData() = default;
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};
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Handle<FunctionObject> callback;
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OwnPtr<CustomData> custom_data { nullptr };
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};
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// 9.5.2 HostMakeJobCallback ( callback ), https://tc39.es/ecma262/#sec-hostmakejobcallback
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inline JobCallback make_job_callback(FunctionObject& callback)
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{
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// 1. Return the JobCallback Record { [[Callback]]: callback, [[HostDefined]]: empty }.
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return { make_handle(&callback) };
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}
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// 9.5.3 HostCallJobCallback ( jobCallback, V, argumentsList ), https://tc39.es/ecma262/#sec-hostcalljobcallback
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inline ThrowCompletionOr<Value> call_job_callback(GlobalObject& global_object, JobCallback& job_callback, Value this_value, MarkedValueList arguments_list)
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{
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// 1. Assert: IsCallable(jobCallback.[[Callback]]) is true.
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VERIFY(!job_callback.callback.is_null());
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// 2. Return ? Call(jobCallback.[[Callback]], V, argumentsList).
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return call(global_object, job_callback.callback.cell(), this_value, move(arguments_list));
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}
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}
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