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
12namespace 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
35 vmachine(unsigned stackSize = 4096)
36 : stack(stackSize)
37 , stack_ptr(stack.begin())
38 {
39 }
40
41 void execute(std::vector<int> const& code);
42 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

source code of boost/libs/spirit/example/qi/compiler_tutorial/calc7/vm.hpp