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- /*=============================================================================
- Copyright (c) 2001-2011 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_CALC7_VM_HPP)
- #define BOOST_SPIRIT_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_load, // load a variable
- op_store, // store a variable
- op_int, // push constant integer into the stack
- op_stk_adj // adjust the stack for local variables
- };
- class vmachine
- {
- public:
- vmachine(unsigned stackSize = 4096)
- : stack(stackSize)
- , stack_ptr(stack.begin())
- {
- }
- void execute(std::vector<int> const& code);
- std::vector<int> const& get_stack() const { return stack; };
- private:
- std::vector<int> stack;
- std::vector<int>::iterator stack_ptr;
- };
- }
- #endif
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