ExecutionContext.hpp

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/**
 * @file ExecutionContext.hpp
 * @author Alexandre Plateau ([email protected])
 * @brief Keeping track of the internal data needed by the VM
 * @version 0.1
 * @date 2021-11-15
 * 
 * @copyright Copyright (c) 2021
 * 
 */
 
#ifndef ARK_VM_EXECUTIONCONTEXT_HPP
#define ARK_VM_EXECUTIONCONTEXT_HPP
 
#include <array>
#include <limits>
#include <optional>
#include <cinttypes>
 
#include <Ark/Constants.hpp>
#include <Ark/VM/Value.hpp>
#include <Ark/VM/Scope.hpp>
 
#ifdef max
#    undef max
#endif
 
namespace Ark::internal
{
    struct ExecutionContext
    {
        static inline unsigned Count = 0;
 
        const bool primary;  ///< Tells if the current ExecutionContext is the primary one or not
        int ip = 0;          ///< Instruction pointer
        std::size_t pp = 0;  ///< Page pointer
        uint16_t sp = 0;     ///< Stack pointer
        uint16_t fc = 0;     ///< Frame count
        uint16_t last_symbol = std::numeric_limits<uint16_t>::max();
 
        std::array<Value, VMStackSize> stack;
        std::vector<uint8_t> scope_count_to_delete;
        std::optional<Scope_t> saved_scope;
        std::vector<Scope_t> locals;
 
        ExecutionContext() noexcept :
            primary(ExecutionContext::Count == 0)
        {
            ExecutionContext::Count++;
        }
    };
}
 
#endif