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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.
*/
#pragma once
#include <AK/FlyString.h>
#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibJS/Forward.h>
#include <LibJS/Heap/Heap.h>
#include <LibJS/Runtime/Exception.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
enum class ScopeType {
None,
Function,
Block,
Try,
};
struct Variable {
Value value;
DeclarationType declaration_type;
};
struct ScopeFrame {
ScopeType type;
NonnullRefPtr<ScopeNode> scope_node;
HashMap<FlyString, Variable> variables;
};
struct CallFrame {
Value this_value;
Vector<Value> arguments;
};
struct Argument {
FlyString name;
Value value;
};
class Interpreter {
public:
Interpreter();
~Interpreter();
Value run(const Statement&, Vector<Argument> = {}, ScopeType = ScopeType::Block);
Object& global_object() { return *m_global_object; }
const Object& global_object() const { return *m_global_object; }
Heap& heap() { return m_heap; }
void unwind(ScopeType type) { m_unwind_until = type; }
Value get_variable(const FlyString& name);
void set_variable(const FlyString& name, Value, bool first_assignment = false);
void declare_variable(const FlyString& name, DeclarationType);
void gather_roots(Badge<Heap>, HashTable<Cell*>&);
void enter_scope(const ScopeNode&, Vector<Argument>, ScopeType);
void exit_scope(const ScopeNode&);
Value call(Function*, Value this_value, const Vector<Value>& arguments);
CallFrame& push_call_frame()
{
m_call_stack.append({ js_undefined(), {} });
return m_call_stack.last();
}
void pop_call_frame() { m_call_stack.take_last(); }
Value this_value() const
{
if (m_call_stack.is_empty())
return m_global_object;
return m_call_stack.last().this_value;
}
Object* string_prototype() { return m_string_prototype; }
Object* object_prototype() { return m_object_prototype; }
Object* array_prototype() { return m_array_prototype; }
Object* error_prototype() { return m_error_prototype; }
Exception* exception() { return m_exception; }
void clear_exception() { m_exception = nullptr; }
template<typename T, typename... Args>
Value throw_exception(Args&&... args)
{
return throw_exception(heap().allocate<T>(forward<Args>(args)...));
}
Value throw_exception(Exception*);
Value throw_exception(Value value)
{
return throw_exception(heap().allocate<Exception>(value));
}
private:
Heap m_heap;
Vector<ScopeFrame> m_scope_stack;
Vector<CallFrame> m_call_stack;
Object* m_global_object { nullptr };
Object* m_string_prototype { nullptr };
Object* m_object_prototype { nullptr };
Object* m_array_prototype { nullptr };
Object* m_error_prototype { nullptr };
Exception* m_exception { nullptr };
ScopeType m_unwind_until { ScopeType::None };
};
}
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