| /*============================================================================= |
| 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_CALC8_VM_HPP) |
| #define BOOST_SPIRIT_CALC8_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 // the program code |
| , std::vector<int>::const_iterator pc // program counter |
| , std::vector<int>::iterator frame_ptr // start of arguments and locals |
| ); |
| |
| int execute(std::vector<int> const& code) |
| { |
| return execute(code, code.begin(), stack.begin()); |
| }; |
| |
| std::vector<int> stack; |
| }; |
| } |
| |
| #endif |
| |
