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https://github.com/LadybirdBrowser/ladybird.git
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c3fe9b4df8
Both GlobalObject and LexicalEnvironment now inherit from ScopeObject, and the VM's call frames point to a ScopeObject chain rather than just a LexicalEnvironment chain. This gives us much more flexibility to implement things like "with", and also unifies some of the code paths that previously required special handling of the global object. There's a bunch of more cleanup that can be done in the wake of this change, and there might be some oversights in the handling of the "super" keyword, but this generally seems like a good architectural improvement. :^)
134 lines
4.4 KiB
C++
134 lines
4.4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/Function.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/LexicalEnvironment.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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LexicalEnvironment::LexicalEnvironment()
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: ScopeObject(nullptr)
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{
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}
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LexicalEnvironment::LexicalEnvironment(EnvironmentRecordType environment_record_type)
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: ScopeObject(nullptr)
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, m_environment_record_type(environment_record_type)
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{
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}
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LexicalEnvironment::LexicalEnvironment(HashMap<FlyString, Variable> variables, ScopeObject* parent_scope)
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: ScopeObject(parent_scope)
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, m_variables(move(variables))
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{
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}
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LexicalEnvironment::LexicalEnvironment(HashMap<FlyString, Variable> variables, ScopeObject* parent_scope, EnvironmentRecordType environment_record_type)
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: ScopeObject(parent_scope)
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, m_environment_record_type(environment_record_type)
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, m_variables(move(variables))
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{
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}
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LexicalEnvironment::~LexicalEnvironment()
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{
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}
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void LexicalEnvironment::visit_edges(Visitor& visitor)
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{
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Cell::visit_edges(visitor);
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visitor.visit(m_this_value);
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visitor.visit(m_home_object);
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visitor.visit(m_new_target);
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visitor.visit(m_current_function);
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for (auto& it : m_variables)
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visitor.visit(it.value.value);
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}
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Optional<Variable> LexicalEnvironment::get_from_scope(const FlyString& name) const
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{
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return m_variables.get(name);
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}
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void LexicalEnvironment::put_to_scope(const FlyString& name, Variable variable)
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{
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m_variables.set(name, variable);
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}
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bool LexicalEnvironment::has_super_binding() const
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{
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return m_environment_record_type == EnvironmentRecordType::Function && this_binding_status() != ThisBindingStatus::Lexical && m_home_object.is_object();
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}
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Value LexicalEnvironment::get_super_base()
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{
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ASSERT(has_super_binding());
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if (m_home_object.is_object())
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return m_home_object.as_object().prototype();
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return {};
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}
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bool LexicalEnvironment::has_this_binding() const
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{
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// More like "is_capable_of_having_a_this_binding".
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switch (m_environment_record_type) {
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case EnvironmentRecordType::Declarative:
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case EnvironmentRecordType::Object:
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return false;
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case EnvironmentRecordType::Function:
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return this_binding_status() != ThisBindingStatus::Lexical;
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case EnvironmentRecordType::Module:
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return true;
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}
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ASSERT_NOT_REACHED();
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}
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Value LexicalEnvironment::get_this_binding(GlobalObject& global_object) const
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{
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ASSERT(has_this_binding());
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if (this_binding_status() == ThisBindingStatus::Uninitialized) {
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vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisHasNotBeenInitialized);
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return {};
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}
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return m_this_value;
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}
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void LexicalEnvironment::bind_this_value(GlobalObject& global_object, Value this_value)
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{
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ASSERT(has_this_binding());
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if (m_this_binding_status == ThisBindingStatus::Initialized) {
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vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisIsAlreadyInitialized);
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return;
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}
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m_this_value = this_value;
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m_this_binding_status = ThisBindingStatus::Initialized;
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}
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}
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