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#ifndef fk_VM_HPP
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#define fk_VM_HPP
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#include "commons.hpp"
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#include "Program.hpp"
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#include "NativeFunction.hpp"
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namespace fk
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{
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using global_t = std::variant<std::shared_ptr<NativeFunction>>;
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struct Frame {
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std::shared_ptr<Program> program;
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std::unordered_map<addr_t, std::shared_ptr<Constant>> locals;
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};
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class VM
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{
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public:
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explicit VM();
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virtual ~VM();
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Frame& frame() { return m_frames.back(); }
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void mount(std::shared_ptr<Program> program);
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void run();
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global_t load_global(addr_t addr) const;
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void store_global(addr_t addr, global_t value);
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size_t store_global(global_t value);
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std::shared_ptr<Constant> load_local(addr_t addr);
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void store_local(addr_t addr, std::shared_ptr<Constant> constant);
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std::string string() const;
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private:
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addr_t m_pc = 0;
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std::vector<Frame> m_frames;
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std::vector<addr_t> m_stack;
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std::unordered_map<addr_t, global_t> m_globals;
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void push(addr_t addr);
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addr_t top();
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addr_t pop();
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};
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}
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#endif
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