mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 17:22:43 +00:00
e1573991a3
Also added a large this value test (and strict variant) to ensure this values have no regressions.
246 lines
10 KiB
C++
246 lines
10 KiB
C++
/*
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* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@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 <AK/Debug.h>
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#include <AK/Function.h>
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#include <LibJS/AST.h>
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#include <LibJS/Bytecode/BasicBlock.h>
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#include <LibJS/Bytecode/Generator.h>
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#include <LibJS/Bytecode/Interpreter.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/FunctionEnvironment.h>
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#include <LibJS/Runtime/GeneratorObject.h>
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#include <LibJS/Runtime/GeneratorObjectPrototype.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/OrdinaryFunctionObject.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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OrdinaryFunctionObject* OrdinaryFunctionObject::create(GlobalObject& global_object, const FlyString& name, const Statement& body, Vector<FunctionNode::Parameter> parameters, i32 m_function_length, Environment* parent_scope, FunctionKind kind, bool is_strict, bool is_arrow_function)
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{
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Object* prototype = nullptr;
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switch (kind) {
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case FunctionKind::Regular:
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prototype = global_object.function_prototype();
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break;
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case FunctionKind::Generator:
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prototype = global_object.generator_function_prototype();
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break;
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}
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return global_object.heap().allocate<OrdinaryFunctionObject>(global_object, global_object, name, body, move(parameters), m_function_length, parent_scope, *prototype, kind, is_strict, is_arrow_function);
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}
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OrdinaryFunctionObject::OrdinaryFunctionObject(GlobalObject& global_object, const FlyString& name, const Statement& body, Vector<FunctionNode::Parameter> parameters, i32 function_length, Environment* parent_scope, Object& prototype, FunctionKind kind, bool is_strict, bool is_arrow_function)
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: FunctionObject(is_arrow_function ? vm().this_value(global_object) : Value(), {}, prototype)
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, m_name(name)
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, m_body(body)
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, m_parameters(move(parameters))
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, m_environment(parent_scope)
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, m_realm(&global_object)
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, m_function_length(function_length)
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, m_kind(kind)
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, m_is_strict(is_strict)
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, m_is_arrow_function(is_arrow_function)
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{
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// NOTE: This logic is from OrdinaryFunctionCreate, https://tc39.es/ecma262/#sec-ordinaryfunctioncreate
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if (m_is_arrow_function)
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set_this_mode(ThisMode::Lexical);
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else if (m_is_strict)
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set_this_mode(ThisMode::Strict);
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else
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set_this_mode(ThisMode::Global);
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// 15.1.3 Static Semantics: IsSimpleParameterList, https://tc39.es/ecma262/#sec-static-semantics-issimpleparameterlist
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set_has_simple_parameter_list(all_of(m_parameters, [&](auto& parameter) {
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if (parameter.is_rest)
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return false;
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if (parameter.default_value)
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return false;
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if (!parameter.binding.template has<FlyString>())
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return false;
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return true;
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}));
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}
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void OrdinaryFunctionObject::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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Base::initialize(global_object);
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if (!m_is_arrow_function) {
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auto* prototype = vm.heap().allocate<Object>(global_object, *global_object.new_ordinary_function_prototype_object_shape());
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switch (m_kind) {
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case FunctionKind::Regular:
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prototype->define_property_or_throw(vm.names.constructor, { .value = this, .writable = true, .enumerable = false, .configurable = true });
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break;
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case FunctionKind::Generator:
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// prototype is "g1.prototype" in figure-2 (https://tc39.es/ecma262/img/figure-2.png)
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prototype->internal_set_prototype_of(global_object.generator_object_prototype());
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break;
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}
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define_direct_property(vm.names.prototype, prototype, Attribute::Writable);
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}
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define_property_or_throw(vm.names.length, { .value = Value(m_function_length), .writable = false, .enumerable = false, .configurable = true });
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define_property_or_throw(vm.names.name, { .value = js_string(vm, m_name.is_null() ? "" : m_name), .writable = false, .enumerable = false, .configurable = true });
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}
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OrdinaryFunctionObject::~OrdinaryFunctionObject()
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{
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}
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void OrdinaryFunctionObject::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_environment);
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}
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FunctionEnvironment* OrdinaryFunctionObject::create_environment(FunctionObject& function_being_invoked)
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{
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HashMap<FlyString, Variable> variables;
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for (auto& parameter : m_parameters) {
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parameter.binding.visit(
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[&](const FlyString& name) { variables.set(name, { js_undefined(), DeclarationKind::Var }); },
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[&](const NonnullRefPtr<BindingPattern>& binding) {
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binding->for_each_bound_name([&](const auto& name) {
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variables.set(name, { js_undefined(), DeclarationKind::Var });
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});
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});
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}
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if (is<ScopeNode>(body())) {
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for (auto& declaration : static_cast<const ScopeNode&>(body()).variables()) {
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for (auto& declarator : declaration.declarations()) {
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declarator.target().visit(
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[&](const NonnullRefPtr<Identifier>& id) {
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variables.set(id->string(), { js_undefined(), declaration.declaration_kind() });
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},
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[&](const NonnullRefPtr<BindingPattern>& binding) {
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binding->for_each_bound_name([&](const auto& name) {
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variables.set(name, { js_undefined(), declaration.declaration_kind() });
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});
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});
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}
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}
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}
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auto* environment = heap().allocate<FunctionEnvironment>(global_object(), m_environment, variables);
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environment->set_function_object(function_being_invoked);
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if (m_is_arrow_function) {
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environment->set_this_binding_status(FunctionEnvironment::ThisBindingStatus::Lexical);
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if (is<FunctionEnvironment>(m_environment))
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environment->set_new_target(static_cast<FunctionEnvironment*>(m_environment)->new_target());
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}
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return environment;
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}
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Value OrdinaryFunctionObject::execute_function_body()
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{
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auto& vm = this->vm();
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Interpreter* ast_interpreter = nullptr;
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auto* bytecode_interpreter = Bytecode::Interpreter::current();
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auto prepare_arguments = [&] {
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auto& execution_context_arguments = vm.running_execution_context().arguments;
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for (size_t i = 0; i < m_parameters.size(); ++i) {
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auto& parameter = m_parameters[i];
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parameter.binding.visit(
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[&](const auto& param) {
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Value argument_value;
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if (parameter.is_rest) {
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auto* array = Array::create(global_object(), 0);
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for (size_t rest_index = i; rest_index < execution_context_arguments.size(); ++rest_index)
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array->indexed_properties().append(execution_context_arguments[rest_index]);
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argument_value = move(array);
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} else if (i < execution_context_arguments.size() && !execution_context_arguments[i].is_undefined()) {
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argument_value = execution_context_arguments[i];
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} else if (parameter.default_value) {
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// FIXME: Support default arguments in the bytecode world!
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if (!bytecode_interpreter)
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argument_value = parameter.default_value->execute(*ast_interpreter, global_object());
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if (vm.exception())
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return;
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} else {
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argument_value = js_undefined();
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}
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vm.assign(param, argument_value, global_object(), true, vm.lexical_environment());
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});
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if (vm.exception())
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return;
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}
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};
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if (bytecode_interpreter) {
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prepare_arguments();
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if (!m_bytecode_executable.has_value()) {
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m_bytecode_executable = Bytecode::Generator::generate(m_body, m_kind == FunctionKind::Generator);
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auto& passes = JS::Bytecode::Interpreter::optimization_pipeline();
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passes.perform(*m_bytecode_executable);
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if constexpr (JS_BYTECODE_DEBUG) {
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dbgln("Optimisation passes took {}us", passes.elapsed());
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dbgln("Compiled Bytecode::Block for function '{}':", m_name);
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for (auto& block : m_bytecode_executable->basic_blocks)
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block.dump(*m_bytecode_executable);
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}
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}
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auto result = bytecode_interpreter->run(*m_bytecode_executable);
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if (m_kind != FunctionKind::Generator)
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return result;
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return GeneratorObject::create(global_object(), result, this, vm.running_execution_context().lexical_environment, bytecode_interpreter->snapshot_frame());
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} else {
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VERIFY(m_kind != FunctionKind::Generator);
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OwnPtr<Interpreter> local_interpreter;
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ast_interpreter = vm.interpreter_if_exists();
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if (!ast_interpreter) {
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local_interpreter = Interpreter::create_with_existing_global_object(global_object());
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ast_interpreter = local_interpreter.ptr();
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}
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VM::InterpreterExecutionScope scope(*ast_interpreter);
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prepare_arguments();
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if (vm.exception())
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return {};
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return ast_interpreter->execute_statement(global_object(), m_body, ScopeType::Function);
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}
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}
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Value OrdinaryFunctionObject::call()
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{
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if (m_is_class_constructor) {
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vm().throw_exception<TypeError>(global_object(), ErrorType::ClassConstructorWithoutNew, m_name);
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return {};
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}
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return execute_function_body();
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}
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Value OrdinaryFunctionObject::construct(FunctionObject&)
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{
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if (m_is_arrow_function || m_kind == FunctionKind::Generator) {
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vm().throw_exception<TypeError>(global_object(), ErrorType::NotAConstructor, m_name);
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return {};
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}
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return execute_function_body();
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}
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void OrdinaryFunctionObject::set_name(const FlyString& name)
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{
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VERIFY(!name.is_null());
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auto& vm = this->vm();
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m_name = name;
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auto success = define_property_or_throw(vm.names.name, { .value = js_string(vm, m_name), .writable = false, .enumerable = false, .configurable = true });
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VERIFY(success);
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}
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}
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