67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
/*=============================================================================
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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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