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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. :^)
101 lines
3.8 KiB
C++
101 lines
3.8 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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#pragma once
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#include <AK/FlyString.h>
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#include <AK/HashMap.h>
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#include <LibJS/Runtime/ScopeObject.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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class LexicalEnvironment final : public ScopeObject {
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JS_OBJECT(LexicalEnvironment, ScopeObject);
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public:
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enum class ThisBindingStatus {
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Lexical,
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Initialized,
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Uninitialized,
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};
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enum class EnvironmentRecordType {
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Declarative,
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Function,
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Object,
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Module,
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};
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LexicalEnvironment();
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LexicalEnvironment(EnvironmentRecordType);
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LexicalEnvironment(HashMap<FlyString, Variable> variables, ScopeObject* parent_scope);
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LexicalEnvironment(HashMap<FlyString, Variable> variables, ScopeObject* parent_scope, EnvironmentRecordType);
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virtual ~LexicalEnvironment() override;
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// ^ScopeObject
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virtual Optional<Variable> get_from_scope(const FlyString&) const override;
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virtual void put_to_scope(const FlyString&, Variable) override;
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virtual bool has_this_binding() const override;
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virtual Value get_this_binding(GlobalObject&) const override;
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void clear();
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const HashMap<FlyString, Variable>& variables() const { return m_variables; }
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void set_home_object(Value object) { m_home_object = object; }
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bool has_super_binding() const;
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Value get_super_base();
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ThisBindingStatus this_binding_status() const { return m_this_binding_status; }
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void bind_this_value(GlobalObject&, Value this_value);
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// Not a standard operation.
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void replace_this_binding(Value this_value) { m_this_value = this_value; }
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Value new_target() const { return m_new_target; };
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void set_new_target(Value new_target) { m_new_target = new_target; }
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Function* current_function() const { return m_current_function; }
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void set_current_function(Function& function) { m_current_function = &function; }
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EnvironmentRecordType type() const { return m_environment_record_type; }
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private:
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virtual bool is_lexical_environment() const final { return true; }
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virtual void visit_edges(Visitor&) override;
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EnvironmentRecordType m_environment_record_type : 8 { EnvironmentRecordType::Declarative };
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ThisBindingStatus m_this_binding_status : 8 { ThisBindingStatus::Uninitialized };
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HashMap<FlyString, Variable> m_variables;
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Value m_home_object;
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Value m_this_value;
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Value m_new_target;
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// Corresponds to [[FunctionObject]]
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Function* m_current_function { nullptr };
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};
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}
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