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https://github.com/RGBCube/serenity
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LibJS: Add the CreateMappedArgumentsObject abstract operation
This patch adds a new ArgumentsObject class to represent what the spec calls "Arguments Exotic Objects" These are constructed by the new CreateMappedArgumentsObject when the `arguments` identifier is resolved in a callee context. The implementation is incomplete and doesn't yet support mapping of the parameter variables to the indexed properties of `arguments`.
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commit
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8 changed files with 95 additions and 10 deletions
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@ -26,6 +26,7 @@ set(SOURCES
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Runtime/AggregateError.cpp
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Runtime/AggregateErrorConstructor.cpp
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Runtime/AggregateErrorPrototype.cpp
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Runtime/ArgumentsObject.cpp
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Runtime/Array.cpp
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Runtime/ArrayBuffer.cpp
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Runtime/ArrayBufferConstructor.cpp
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@ -11,6 +11,7 @@
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#include <LibJS/Interpreter.h>
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#include <LibJS/Parser.h>
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/ArgumentsObject.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/ArrayPrototype.h>
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#include <LibJS/Runtime/BoundFunction.h>
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@ -214,6 +215,9 @@ Object* create_unmapped_arguments_object(GlobalObject& global_object, Vector<Val
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if (vm.exception())
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return nullptr;
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for (auto& argument : arguments)
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object->indexed_properties().append(argument);
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// 4. Perform DefinePropertyOrThrow(obj, "length", PropertyDescriptor { [[Value]]: 𝔽(len), [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
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auto length = arguments.size();
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object->define_property(vm.names.length, Value(length), Attribute::Writable | Attribute::Configurable);
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@ -222,9 +226,6 @@ Object* create_unmapped_arguments_object(GlobalObject& global_object, Vector<Val
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object->define_property(*vm.well_known_symbol_iterator(), global_object.array_prototype()->get(vm.names.values), Attribute::Writable | Attribute::Configurable);
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for (auto& argument : arguments)
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object->indexed_properties().append(argument);
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// 8. Perform ! DefinePropertyOrThrow(obj, "callee", PropertyDescriptor { [[Get]]: %ThrowTypeError%, [[Set]]: %ThrowTypeError%, [[Enumerable]]: false, [[Configurable]]: false }).
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object->define_accessor(vm.names.callee, global_object.throw_type_error_function(), global_object.throw_type_error_function(), 0);
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if (vm.exception())
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@ -233,4 +234,40 @@ Object* create_unmapped_arguments_object(GlobalObject& global_object, Vector<Val
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return object;
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}
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// 10.4.4.7 CreateMappedArgumentsObject ( func, formals, argumentsList, env ), https://tc39.es/ecma262/#sec-createmappedargumentsobject
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Object* create_mapped_arguments_object(GlobalObject& global_object, FunctionObject& function, Vector<FunctionNode::Parameter> const& formals, Vector<Value> const& arguments, EnvironmentRecord&)
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{
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// FIXME: This implementation is incomplete and doesn't support the actual identifier mappings yet.
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(void)formals;
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auto& vm = global_object.vm();
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auto* object = vm.heap().allocate<ArgumentsObject>(global_object, global_object);
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if (vm.exception())
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return nullptr;
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// 14. Let index be 0.
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// 15. Repeat, while index < len,
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// a. Let val be argumentsList[index].
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// b . Perform ! CreateDataPropertyOrThrow(obj, ! ToString(𝔽(index)), val).
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// c. Set index to index + 1.
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for (auto& argument : arguments)
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object->indexed_properties().append(argument);
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// 16. Perform ! DefinePropertyOrThrow(obj, "length", PropertyDescriptor { [[Value]]: 𝔽(len), [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
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auto length = arguments.size();
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object->define_property(vm.names.length, Value(length), Attribute::Writable | Attribute::Configurable);
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if (vm.exception())
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return nullptr;
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// 20. Perform ! DefinePropertyOrThrow(obj, @@iterator, PropertyDescriptor { [[Value]]: %Array.prototype.values%, [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
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object->define_property(*vm.well_known_symbol_iterator(), global_object.array_prototype()->get(vm.names.values), Attribute::Writable | Attribute::Configurable);
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// 21. Perform ! DefinePropertyOrThrow(obj, "callee", PropertyDescriptor { [[Value]]: func, [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true }).
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object->define_property(vm.names.callee, Value(&function), Attribute::Writable | Attribute::Configurable);
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if (vm.exception())
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return nullptr;
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return object;
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}
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}
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@ -7,6 +7,7 @@
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#pragma once
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#include <AK/Forward.h>
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#include <LibJS/AST.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Value.h>
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@ -24,6 +25,7 @@ FunctionObject* species_constructor(GlobalObject&, Object const&, FunctionObject
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GlobalObject* get_function_realm(GlobalObject&, FunctionObject const&);
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Object* get_prototype_from_constructor(GlobalObject&, FunctionObject const& constructor, Object* (GlobalObject::*intrinsic_default_prototype)());
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Object* create_unmapped_arguments_object(GlobalObject&, Vector<Value> const& arguments);
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Object* create_mapped_arguments_object(GlobalObject&, FunctionObject&, Vector<FunctionNode::Parameter> const&, Vector<Value> const& arguments, EnvironmentRecord&);
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enum class CallerMode {
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Strict,
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26
Userland/Libraries/LibJS/Runtime/ArgumentsObject.cpp
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26
Userland/Libraries/LibJS/Runtime/ArgumentsObject.cpp
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@ -0,0 +1,26 @@
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/*
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* Copyright (c) 2021, Andreas Kling <kling@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/ArgumentsObject.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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ArgumentsObject::ArgumentsObject(GlobalObject& global_object)
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: Object(*global_object.object_prototype())
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{
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}
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void ArgumentsObject::initialize(GlobalObject& global_object)
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{
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Base::initialize(global_object);
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}
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ArgumentsObject::~ArgumentsObject()
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{
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}
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}
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23
Userland/Libraries/LibJS/Runtime/ArgumentsObject.h
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23
Userland/Libraries/LibJS/Runtime/ArgumentsObject.h
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@ -0,0 +1,23 @@
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/*
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* Copyright (c) 2021, Andreas Kling <kling@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/Object.h>
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namespace JS {
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class ArgumentsObject final : public Object {
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JS_OBJECT(ArgumentsObject, Object);
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public:
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explicit ArgumentsObject(GlobalObject&);
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virtual void initialize(GlobalObject&) override;
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virtual ~ArgumentsObject() override;
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};
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}
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@ -108,6 +108,7 @@ public:
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virtual bool is_global_object() const { return false; }
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virtual bool is_proxy_object() const { return false; }
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virtual bool is_native_function() const { return false; }
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virtual bool is_ordinary_function_object() const { return false; }
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// B.3.7 The [[IsHTMLDDA]] Internal Slot, https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot
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virtual bool is_htmldda() const { return false; }
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@ -41,6 +41,7 @@ protected:
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virtual bool is_strict_mode() const final { return m_is_strict; }
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private:
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virtual bool is_ordinary_function_object() const { return true; }
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virtual FunctionEnvironmentRecord* create_environment_record(FunctionObject&) override;
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virtual void visit_edges(Visitor&) override;
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@ -372,13 +372,7 @@ Value VM::get_variable(const FlyString& name, GlobalObject& global_object)
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if (context.function->is_strict_mode() || !context.function->has_simple_parameter_list()) {
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context.arguments_object = create_unmapped_arguments_object(global_object, context.arguments);
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} else {
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// FIXME: This code path is completely ad-hoc.
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context.arguments_object = Array::create(global_object);
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context.arguments_object->put(names.callee, context.function);
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for (auto argument : context.arguments) {
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context.arguments_object->indexed_properties().append(argument);
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}
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context.arguments_object = create_mapped_arguments_object(global_object, *context.function, verify_cast<OrdinaryFunctionObject>(context.function)->parameters(), context.arguments, *lexical_environment());
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}
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}
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return context.arguments_object;
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