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/*=============================================================================
Copyright (c) 2001-2014 Joel de Guzman
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#if !defined(BOOST_SPIRIT_X3_CALC7_VM_HPP)
#define BOOST_SPIRIT_X3_CALC7_VM_HPP
#include <vector>
namespace client
{
///////////////////////////////////////////////////////////////////////////
// The Virtual Machine
///////////////////////////////////////////////////////////////////////////
enum byte_code
{
op_neg, // negate the top stack entry
op_add, // add top two stack entries
op_sub, // subtract top two stack entries
op_mul, // multiply top two stack entries
op_div, // divide top two stack entries
op_int, // push constant integer into the stack
};
class vmachine
{
public:
vmachine(unsigned stackSize = 4096)
: stack(stackSize)
, stack_ptr(stack.begin())
{
}
int top() const { return stack_ptr[-1]; };
void execute(std::vector<int> const& code);
private:
std::vector<int> stack;
std::vector<int>::iterator stack_ptr;
};
}
#endif
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