53 lines
1.5 KiB
C++
53 lines
1.5 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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#if !defined(BOOST_SPIRIT_CALC7_VM_HPP)
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#define BOOST_SPIRIT_CALC7_VM_HPP
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#include <vector>
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namespace client
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{
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///////////////////////////////////////////////////////////////////////////
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// The Virtual Machine
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///////////////////////////////////////////////////////////////////////////
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enum byte_code
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{
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op_neg, // negate the top stack entry
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op_add, // add top two stack entries
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op_sub, // subtract top two stack entries
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op_mul, // multiply top two stack entries
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op_div, // divide top two stack entries
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op_load, // load a variable
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op_store, // store a variable
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op_int, // push constant integer into the stack
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op_stk_adj // adjust the stack for local variables
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};
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class vmachine
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{
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public:
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vmachine(unsigned stackSize = 4096)
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: stack(stackSize)
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, stack_ptr(stack.begin())
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{
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}
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void execute(std::vector<int> const& code);
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std::vector<int> const& get_stack() const { return stack; };
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private:
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std::vector<int> stack;
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std::vector<int>::iterator stack_ptr;
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};
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}
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#endif
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