| 1 | /*============================================================================= |
|---|---|
| 2 | Copyright (c) 2001-2014 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 | #include "vm.hpp" |
| 8 | |
| 9 | namespace client |
| 10 | { |
| 11 | void vmachine::execute(std::vector<int> const& code) |
| 12 | { |
| 13 | auto pc = code.begin(); |
| 14 | auto locals = stack.begin(); |
| 15 | stack_ptr = stack.begin(); |
| 16 | |
| 17 | while (pc != code.end()) |
| 18 | { |
| 19 | switch (*pc++) |
| 20 | { |
| 21 | case op_neg: |
| 22 | stack_ptr[-1] = -stack_ptr[-1]; |
| 23 | break; |
| 24 | |
| 25 | case op_add: |
| 26 | --stack_ptr; |
| 27 | stack_ptr[-1] += stack_ptr[0]; |
| 28 | break; |
| 29 | |
| 30 | case op_sub: |
| 31 | --stack_ptr; |
| 32 | stack_ptr[-1] -= stack_ptr[0]; |
| 33 | break; |
| 34 | |
| 35 | case op_mul: |
| 36 | --stack_ptr; |
| 37 | stack_ptr[-1] *= stack_ptr[0]; |
| 38 | break; |
| 39 | |
| 40 | case op_div: |
| 41 | --stack_ptr; |
| 42 | stack_ptr[-1] /= stack_ptr[0]; |
| 43 | break; |
| 44 | |
| 45 | case op_load: |
| 46 | *stack_ptr++ = locals[*pc++]; |
| 47 | break; |
| 48 | |
| 49 | case op_store: |
| 50 | --stack_ptr; |
| 51 | locals[*pc++] = stack_ptr[0]; |
| 52 | break; |
| 53 | |
| 54 | case op_int: |
| 55 | *stack_ptr++ = *pc++; |
| 56 | break; |
| 57 | |
| 58 | case op_stk_adj: |
| 59 | stack_ptr = stack.begin() + *pc++; |
| 60 | break; |
| 61 | } |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 |