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5f463ed989
The arguments Span (pointer + size = 16 bytes) was always derivable from the tail array layout: data = values + (total_count - arg_count). Replace it with a u32 argument_count and derive the span on demand via arguments_span() / arguments_data() accessors. Shrinks ExecutionContext from 136 to 120 bytes.
61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
/*
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* Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
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#include <LibJS/Runtime/FunctionConstructor.h>
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#include <LibJS/Runtime/GeneratorFunctionConstructor.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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GC_DEFINE_ALLOCATOR(GeneratorFunctionConstructor);
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GeneratorFunctionConstructor::GeneratorFunctionConstructor(Realm& realm)
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: NativeFunction(static_cast<Object&>(realm.intrinsics().function_constructor()))
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{
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}
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void GeneratorFunctionConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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Base::initialize(realm);
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// 27.3.2.1 GeneratorFunction.length, https://tc39.es/ecma262/#sec-generatorfunction.length
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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// 27.3.2.2 GeneratorFunction.prototype, https://tc39.es/ecma262/#sec-generatorfunction.length
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define_direct_property(vm.names.prototype, realm.intrinsics().generator_function_prototype(), 0);
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}
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// 27.3.1.1 GeneratorFunction ( p1, p2, … , pn, body ), https://tc39.es/ecma262/#sec-generatorfunction
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ThrowCompletionOr<Value> GeneratorFunctionConstructor::call()
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{
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return TRY(construct(*this));
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}
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// 27.3.1.1 GeneratorFunction ( ...parameterArgs, bodyArg ), https://tc39.es/ecma262/#sec-generatorfunction
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ThrowCompletionOr<GC::Ref<Object>> GeneratorFunctionConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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ReadonlySpan<Value> arguments = vm.running_execution_context().arguments_span();
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ReadonlySpan<Value> parameter_args = arguments;
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if (!parameter_args.is_empty())
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parameter_args = parameter_args.slice(0, parameter_args.size() - 1);
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// 1. Let C be the active function object.
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auto* constructor = vm.active_function_object();
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// 2. If bodyArg is not present, set bodyArg to the empty String.
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Value body_arg = &vm.empty_string();
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if (!arguments.is_empty())
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body_arg = arguments.last();
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// 3. Return ? CreateDynamicFunction(C, NewTarget, generator, parameterArgs, bodyArg).
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return TRY(FunctionConstructor::create_dynamic_function(vm, *constructor, &new_target, FunctionKind::Generator, parameter_args, body_arg));
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}
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}
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