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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "Generator.h"
#include <LibJS/Bytecode/Label.h>
#include <LibJS/Bytecode/Register.h>
#include <LibJS/Forward.h>
#include <LibJS/Heap/Cell.h>
#include <LibJS/Heap/Handle.h>
#include <LibJS/Runtime/Exception.h>
#include <LibJS/Runtime/Value.h>
namespace JS::Bytecode {
using RegisterWindow = Vector<Value>;
class Interpreter {
public:
explicit Interpreter(GlobalObject&);
~Interpreter();
// FIXME: Remove this thing once we don't need it anymore!
static Interpreter* current();
GlobalObject& global_object() { return m_global_object; }
VM& vm() { return m_vm; }
Value run(Bytecode::Executable const&, Bytecode::BasicBlock const* entry_point = nullptr);
ALWAYS_INLINE Value& accumulator() { return reg(Register::accumulator()); }
Value& reg(Register const& r) { return registers()[r.index()]; }
[[nodiscard]] RegisterWindow snapshot_frame() const { return m_register_windows.last(); }
void enter_frame(RegisterWindow const& frame)
{
++m_manually_entered_frames;
m_register_windows.append(make<RegisterWindow>(frame));
}
void leave_frame()
{
VERIFY(m_manually_entered_frames);
--m_manually_entered_frames;
m_register_windows.take_last();
}
void jump(Label const& label)
{
m_pending_jump = &label.block();
}
void do_return(Value return_value) { m_return_value = return_value; }
void enter_unwind_context(Optional<Label> handler_target, Optional<Label> finalizer_target);
void leave_unwind_context();
void continue_pending_unwind(Label const& resume_label);
Executable const& current_executable() { return *m_current_executable; }
private:
RegisterWindow& registers() { return m_register_windows.last(); }
VM& m_vm;
GlobalObject& m_global_object;
NonnullOwnPtrVector<RegisterWindow> m_register_windows;
Optional<BasicBlock const*> m_pending_jump;
Value m_return_value;
size_t m_manually_entered_frames { 0 };
Executable const* m_current_executable { nullptr };
Vector<UnwindInfo> m_unwind_contexts;
Handle<Exception> m_saved_exception;
};
}
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