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LibJS: Add support for async functions

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This commit adds support for the most bare bones version of async
functions, support for async generator functions, async arrow functions
and await expressions are TODO.
This commit is contained in:
Idan Horowitz
2021-11-09 20:39:22 +02:00
committed by Linus Groh
parent 05c3320da3
commit 681787de76
Notes: sideshowbarker 2024-07-18 01:21:33 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/681787de765
Pull-request: https://github.com/SerenityOS/serenity/pull/10856
Reviewed-by: https://github.com/davidot
Reviewed-by: https://github.com/linusg ✅
17 changed files with 399 additions and 36 deletions
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60
Userland/Libraries/LibJS/Runtime/AsyncFunctionConstructor.cpp Normal file
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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/AsyncFunctionConstructor.h>
#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
#include <LibJS/Runtime/FunctionConstructor.h>
#include <LibJS/Runtime/FunctionObject.h>
#include <LibJS/Runtime/GlobalObject.h>
namespace JS {
AsyncFunctionConstructor::AsyncFunctionConstructor(GlobalObject& global_object)
: NativeFunction(vm().names.AsyncFunction.as_string(), *global_object.function_prototype())
{
}
void AsyncFunctionConstructor::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
NativeFunction::initialize(global_object);
// 27.7.2.2 AsyncFunction.prototype, https://tc39.es/ecma262/#sec-async-function-constructor-prototype
define_direct_property(vm.names.prototype, global_object.async_function_prototype(), 0);
define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
}
// 27.7.1.1 AsyncFunction ( p1, p2, … , pn, body ), https://tc39.es/ecma262/#sec-async-function-constructor-arguments
ThrowCompletionOr<Value> AsyncFunctionConstructor::call()
{
return TRY(construct(*this));
}
// 27.7.1.1 AsyncFunction ( p1, p2, … , pn, body ), https://tc39.es/ecma262/#sec-async-function-constructor-arguments
ThrowCompletionOr<Object*> AsyncFunctionConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
auto function = TRY(FunctionConstructor::create_dynamic_function_node(global_object(), new_target, FunctionKind::Async));
OwnPtr<Interpreter> local_interpreter;
Interpreter* interpreter = vm.interpreter_if_exists();
if (!interpreter) {
local_interpreter = Interpreter::create_with_existing_realm(*realm());
interpreter = local_interpreter.ptr();
}
VM::InterpreterExecutionScope scope(*interpreter);
auto result = function->execute(*interpreter, global_object());
if (auto* exception = vm.exception())
return throw_completion(exception->value());
VERIFY(result.is_object() && is<ECMAScriptFunctionObject>(result.as_object()));
return &result.as_object();
}
}