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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Function.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/LexicalEnvironment.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
LexicalEnvironment::LexicalEnvironment()
: ScopeObject(nullptr)
{
}
LexicalEnvironment::LexicalEnvironment(EnvironmentRecordType environment_record_type)
: ScopeObject(nullptr)
, m_environment_record_type(environment_record_type)
{
}
LexicalEnvironment::LexicalEnvironment(HashMap<FlyString, Variable> variables, ScopeObject* parent_scope)
: ScopeObject(parent_scope)
, m_variables(move(variables))
{
}
LexicalEnvironment::LexicalEnvironment(HashMap<FlyString, Variable> variables, ScopeObject* parent_scope, EnvironmentRecordType environment_record_type)
: ScopeObject(parent_scope)
, m_environment_record_type(environment_record_type)
, m_variables(move(variables))
{
}
LexicalEnvironment::~LexicalEnvironment()
{
}
void LexicalEnvironment::visit_edges(Visitor& visitor)
{
Cell::visit_edges(visitor);
visitor.visit(m_this_value);
visitor.visit(m_home_object);
visitor.visit(m_new_target);
visitor.visit(m_current_function);
for (auto& it : m_variables)
visitor.visit(it.value.value);
}
Optional<Variable> LexicalEnvironment::get_from_scope(const FlyString& name) const
{
return m_variables.get(name);
}
void LexicalEnvironment::put_to_scope(const FlyString& name, Variable variable)
{
m_variables.set(name, variable);
}
bool LexicalEnvironment::has_super_binding() const
{
return m_environment_record_type == EnvironmentRecordType::Function && this_binding_status() != ThisBindingStatus::Lexical && m_home_object.is_object();
}
Value LexicalEnvironment::get_super_base()
{
ASSERT(has_super_binding());
if (m_home_object.is_object())
return m_home_object.as_object().prototype();
return {};
}
bool LexicalEnvironment::has_this_binding() const
{
// More like "is_capable_of_having_a_this_binding".
switch (m_environment_record_type) {
case EnvironmentRecordType::Declarative:
case EnvironmentRecordType::Object:
return false;
case EnvironmentRecordType::Function:
return this_binding_status() != ThisBindingStatus::Lexical;
case EnvironmentRecordType::Module:
return true;
}
ASSERT_NOT_REACHED();
}
Value LexicalEnvironment::get_this_binding(GlobalObject& global_object) const
{
ASSERT(has_this_binding());
if (this_binding_status() == ThisBindingStatus::Uninitialized) {
vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisHasNotBeenInitialized);
return {};
}
return m_this_value;
}
void LexicalEnvironment::bind_this_value(GlobalObject& global_object, Value this_value)
{
ASSERT(has_this_binding());
if (m_this_binding_status == ThisBindingStatus::Initialized) {
vm().throw_exception<ReferenceError>(global_object, ErrorType::ThisIsAlreadyInitialized);
return;
}
m_this_value = this_value;
m_this_binding_status = ThisBindingStatus::Initialized;
}
}
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