1 /*============================================================================= 2 Copyright (c) 2001-2011 Joel de Guzman 3 4 Distributed under the Boost Software License, Version 1.0. (See accompanying 5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 =============================================================================*/ 7 #if !defined(BOOST_SPIRIT_CALC7_VM_HPP) 8 #define BOOST_SPIRIT_CALC7_VM_HPP 9 10 #include <vector> 11 12 namespace client 13 { 14 /////////////////////////////////////////////////////////////////////////// 15 // The Virtual Machine 16 /////////////////////////////////////////////////////////////////////////// 17 enum byte_code 18 { 19 op_neg, // negate the top stack entry 20 op_add, // add top two stack entries 21 op_sub, // subtract top two stack entries 22 op_mul, // multiply top two stack entries 23 op_div, // divide top two stack entries 24 25 op_load, // load a variable 26 op_store, // store a variable 27 op_int, // push constant integer into the stack 28 op_stk_adj // adjust the stack for local variables 29 }; 30 31 class vmachine 32 { 33 public: 34 vmachine(unsigned stackSize=4096)35 vmachine(unsigned stackSize = 4096) 36 : stack(stackSize) 37 , stack_ptr(stack.begin()) 38 { 39 } 40 41 void execute(std::vector<int> const& code); get_stack() const42 std::vector<int> const& get_stack() const { return stack; }; 43 44 private: 45 46 std::vector<int> stack; 47 std::vector<int>::iterator stack_ptr; 48 }; 49 } 50 51 #endif 52 53