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ladybird/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
Linus Groh d5f90cf187 LibJS: Rename ECMAScriptFunctionObject members to match spec names 
Also add the internal slot names as comments, and separate them into
groups of spec and non-spec members.
This will make it easier to compare the implementation code with the
spec, as well as identify internal slots currently missing or only
present on FunctionObject.
2021-09-25 17:51:30 +02:00

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/*
* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <AK/Function.h>
#include <LibJS/AST.h>
#include <LibJS/Bytecode/BasicBlock.h>
#include <LibJS/Bytecode/Generator.h>
#include <LibJS/Bytecode/Interpreter.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/FunctionEnvironment.h>
#include <LibJS/Runtime/GeneratorObject.h>
#include <LibJS/Runtime/GeneratorObjectPrototype.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
ECMAScriptFunctionObject* ECMAScriptFunctionObject::create(GlobalObject& global_object, FlyString name, Statement const& ecmascript_code, Vector<FunctionNode::Parameter> parameters, i32 m_function_length, Environment* parent_scope, FunctionKind kind, bool is_strict, bool is_arrow_function)
{
Object* prototype = nullptr;
switch (kind) {
case FunctionKind::Regular:
prototype = global_object.function_prototype();
break;
case FunctionKind::Generator:
prototype = global_object.generator_function_prototype();
break;
}
return global_object.heap().allocate<ECMAScriptFunctionObject>(global_object, global_object, move(name), ecmascript_code, move(parameters), m_function_length, parent_scope, *prototype, kind, is_strict, is_arrow_function);
}
ECMAScriptFunctionObject::ECMAScriptFunctionObject(GlobalObject& global_object, FlyString name, Statement const& ecmascript_code, Vector<FunctionNode::Parameter> formal_parameters, i32 function_length, Environment* parent_scope, Object& prototype, FunctionKind kind, bool strict, bool is_arrow_function)
: FunctionObject(is_arrow_function ? vm().this_value(global_object) : Value(), {}, prototype)
, m_environment(parent_scope)
, m_formal_parameters(move(formal_parameters))
, m_ecmascript_code(ecmascript_code)
, m_realm(vm().interpreter_if_exists() ? &vm().interpreter().realm() : nullptr)
, m_strict(strict)
, m_name(move(name))
, m_function_length(function_length)
, m_kind(kind)
, m_is_arrow_function(is_arrow_function)
{
// NOTE: This logic is from OrdinaryFunctionCreate, https://tc39.es/ecma262/#sec-ordinaryfunctioncreate
if (m_is_arrow_function)
set_this_mode(ThisMode::Lexical);
else if (m_strict)
set_this_mode(ThisMode::Strict);
else
set_this_mode(ThisMode::Global);
// 15.1.3 Static Semantics: IsSimpleParameterList, https://tc39.es/ecma262/#sec-static-semantics-issimpleparameterlist
set_has_simple_parameter_list(all_of(m_formal_parameters, [&](auto& parameter) {
if (parameter.is_rest)
return false;
if (parameter.default_value)
return false;
if (!parameter.binding.template has<FlyString>())
return false;
return true;
}));
}
void ECMAScriptFunctionObject::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
Base::initialize(global_object);
if (!m_is_arrow_function) {
auto* prototype = vm.heap().allocate<Object>(global_object, *global_object.new_ordinary_function_prototype_object_shape());
switch (m_kind) {
case FunctionKind::Regular:
prototype->define_property_or_throw(vm.names.constructor, { .value = this, .writable = true, .enumerable = false, .configurable = true });
break;
case FunctionKind::Generator:
// prototype is "g1.prototype" in figure-2 (https://tc39.es/ecma262/img/figure-2.png)
prototype->internal_set_prototype_of(global_object.generator_object_prototype());
break;
}
define_direct_property(vm.names.prototype, prototype, Attribute::Writable);
}
define_property_or_throw(vm.names.length, { .value = Value(m_function_length), .writable = false, .enumerable = false, .configurable = true });
define_property_or_throw(vm.names.name, { .value = js_string(vm, m_name.is_null() ? "" : m_name), .writable = false, .enumerable = false, .configurable = true });
}
ECMAScriptFunctionObject::~ECMAScriptFunctionObject()
{
}
void ECMAScriptFunctionObject::visit_edges(Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_environment);
visitor.visit(m_realm);
}
FunctionEnvironment* ECMAScriptFunctionObject::create_environment(FunctionObject& function_being_invoked)
{
HashMap<FlyString, Variable> variables;
for (auto& parameter : m_formal_parameters) {
parameter.binding.visit(
[&](const FlyString& name) { variables.set(name, { js_undefined(), DeclarationKind::Var }); },
[&](const NonnullRefPtr<BindingPattern>& binding) {
binding->for_each_bound_name([&](const auto& name) {
variables.set(name, { js_undefined(), DeclarationKind::Var });
});
});
}
if (is<ScopeNode>(ecmascript_code())) {
for (auto& declaration : static_cast<const ScopeNode&>(ecmascript_code()).variables()) {
for (auto& declarator : declaration.declarations()) {
declarator.target().visit(
[&](const NonnullRefPtr<Identifier>& id) {
variables.set(id->string(), { js_undefined(), declaration.declaration_kind() });
},
[&](const NonnullRefPtr<BindingPattern>& binding) {
binding->for_each_bound_name([&](const auto& name) {
variables.set(name, { js_undefined(), declaration.declaration_kind() });
});
});
}
}
}
auto* environment = heap().allocate<FunctionEnvironment>(global_object(), m_environment, variables);
environment->set_function_object(function_being_invoked);
if (m_is_arrow_function) {
environment->set_this_binding_status(FunctionEnvironment::ThisBindingStatus::Lexical);
if (is<FunctionEnvironment>(m_environment))
environment->set_new_target(static_cast<FunctionEnvironment*>(m_environment)->new_target());
}
return environment;
}
Value ECMAScriptFunctionObject::execute_function_body()
{
auto& vm = this->vm();
Interpreter* ast_interpreter = nullptr;
auto* bytecode_interpreter = Bytecode::Interpreter::current();
auto prepare_arguments = [&] {
auto& execution_context_arguments = vm.running_execution_context().arguments;
for (size_t i = 0; i < m_formal_parameters.size(); ++i) {
auto& parameter = m_formal_parameters[i];
parameter.binding.visit(
[&](const auto& param) {
Value argument_value;
if (parameter.is_rest) {
auto* array = Array::create(global_object(), 0);
for (size_t rest_index = i; rest_index < execution_context_arguments.size(); ++rest_index)
array->indexed_properties().append(execution_context_arguments[rest_index]);
argument_value = move(array);
} else if (i < execution_context_arguments.size() && !execution_context_arguments[i].is_undefined()) {
argument_value = execution_context_arguments[i];
} else if (parameter.default_value) {
// FIXME: Support default arguments in the bytecode world!
if (!bytecode_interpreter)
argument_value = parameter.default_value->execute(*ast_interpreter, global_object());
if (vm.exception())
return;
} else {
argument_value = js_undefined();
}
vm.assign(param, argument_value, global_object(), true, vm.lexical_environment());
});
if (vm.exception())
return;
}
};
if (bytecode_interpreter) {
prepare_arguments();
if (!m_bytecode_executable.has_value()) {
m_bytecode_executable = Bytecode::Generator::generate(m_ecmascript_code, m_kind == FunctionKind::Generator);
auto& passes = JS::Bytecode::Interpreter::optimization_pipeline();
passes.perform(*m_bytecode_executable);
if constexpr (JS_BYTECODE_DEBUG) {
dbgln("Optimisation passes took {}us", passes.elapsed());
dbgln("Compiled Bytecode::Block for function '{}':", m_name);
for (auto& block : m_bytecode_executable->basic_blocks)
block.dump(*m_bytecode_executable);
}
}
auto result = bytecode_interpreter->run(*m_bytecode_executable);
if (m_kind != FunctionKind::Generator)
return result;
return GeneratorObject::create(global_object(), result, this, vm.running_execution_context().lexical_environment, bytecode_interpreter->snapshot_frame());
} else {
VERIFY(m_kind != FunctionKind::Generator);
OwnPtr<Interpreter> local_interpreter;
ast_interpreter = vm.interpreter_if_exists();
if (!ast_interpreter) {
local_interpreter = Interpreter::create_with_existing_realm(*realm());
ast_interpreter = local_interpreter.ptr();
}
VM::InterpreterExecutionScope scope(*ast_interpreter);
prepare_arguments();
if (vm.exception())
return {};
return ast_interpreter->execute_statement(global_object(), m_ecmascript_code, ScopeType::Function);
}
}
Value ECMAScriptFunctionObject::call()
{
if (m_is_class_constructor) {
vm().throw_exception<TypeError>(global_object(), ErrorType::ClassConstructorWithoutNew, m_name);
return {};
}
return execute_function_body();
}
Value ECMAScriptFunctionObject::construct(FunctionObject&)
{
if (m_is_arrow_function || m_kind == FunctionKind::Generator) {
vm().throw_exception<TypeError>(global_object(), ErrorType::NotAConstructor, m_name);
return {};
}
return execute_function_body();
}
void ECMAScriptFunctionObject::set_name(const FlyString& name)
{
VERIFY(!name.is_null());
auto& vm = this->vm();
m_name = name;
auto success = define_property_or_throw(vm.names.name, { .value = js_string(vm, m_name), .writable = false, .enumerable = false, .configurable = true });
VERIFY(success);
}
}
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