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Viewing changes to libs/spirit/example/qi/compiler_tutorial/calc7/vm.cpp

  • Committer: Package Import Robot
  • Author(s): Steve M. Robbins
  • Date: 2012-02-26 00:31:44 UTC
  • Revision ID: package-import@ubuntu.com-20120226003144-eaytp12cbf6ubpms
Tags: upstream-1.49.0
Import upstream version 1.49.0

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libs/spirit/example/qi/compiler_tutorial/calc7/vm.cpp
 
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/*=============================================================================
 
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    Copyright (c) 2001-2011 Joel de Guzman
 
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    Distributed under the Boost Software License, Version 1.0. (See accompanying
 
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    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
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=============================================================================*/
 
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#include "vm.hpp"
 
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namespace client
 
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{
 
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    void vmachine::execute(std::vector<int> const& code)
 
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    {
 
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        std::vector<int>::const_iterator pc = code.begin();
 
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        std::vector<int>::iterator locals = stack.begin();
 
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        stack_ptr = stack.begin();
 
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        while (pc != code.end())
 
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        {
 
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            switch (*pc++)
 
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            {
 
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                case op_neg:
 
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                    stack_ptr[-1] = -stack_ptr[-1];
 
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                    break;
 
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                case op_add:
 
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                    --stack_ptr;
 
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                    stack_ptr[-1] += stack_ptr[0];
 
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                    break;
 
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                case op_sub:
 
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                    --stack_ptr;
 
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                    stack_ptr[-1] -= stack_ptr[0];
 
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                    break;
 
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                case op_mul:
 
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                    --stack_ptr;
 
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                    stack_ptr[-1] *= stack_ptr[0];
 
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                    break;
 
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                case op_div:
 
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                    --stack_ptr;
 
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                    stack_ptr[-1] /= stack_ptr[0];
 
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                    break;
 
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                case op_load:
 
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                    *stack_ptr++ = locals[*pc++];
 
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                    break;
 
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                case op_store:
 
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                    --stack_ptr;
 
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                    locals[*pc++] = stack_ptr[0];
 
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                    break;
 
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                case op_int:
 
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                    *stack_ptr++ = *pc++;
 
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                    break;
 
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                case op_stk_adj:
 
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                    stack_ptr = stack.begin() + *pc++;
 
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                    break;
 
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            }
 
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        }
 
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    }
 
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}
 
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