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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_MINIC_VM_HPP)
- #define BOOST_SPIRIT_MINIC_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_not, // boolean negate the top stack entry
- op_eq, // compare the top two stack entries for ==
- op_neq, // compare the top two stack entries for !=
- op_lt, // compare the top two stack entries for <
- op_lte, // compare the top two stack entries for <=
- op_gt, // compare the top two stack entries for >
- op_gte, // compare the top two stack entries for >=
- op_and, // logical and top two stack entries
- op_or, // logical or top two stack entries
- op_load, // load a variable
- op_store, // store a variable
- op_int, // push constant integer into the stack
- op_true, // push constant 0 into the stack
- op_false, // push constant 1 into the stack
- op_jump_if, // jump to a relative position in the code if top stack
- // evaluates to false
- op_jump, // jump to a relative position in the code
- op_stk_adj, // adjust the stack (for args and locals)
- op_call, // function call
- op_return // return from function
- };
- class vmachine
- {
- public:
- vmachine(unsigned stackSize = 4096)
- : stack(stackSize)
- {
- }
- int execute(std::vector<int> const& code)
- {
- return execute(code, code.begin(), stack.begin());
- }
- std::vector<int> const& get_stack() const { return stack; };
- std::vector<int>& get_stack() { return stack; };
- private:
- int execute(
- std::vector<int> const& code // the program code
- , std::vector<int>::const_iterator pc // program counter
- , std::vector<int>::iterator frame_ptr // start of arguments and locals
- );
- std::vector<int> stack;
- };
- }
- #endif
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