programCode.hpp

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#ifndef _DATABASE_VIRTUAL_MACHINE_PROGRAM_CODE_HPP_INCLUDED
#define _DATABASE_VIRTUAL_MACHINE_PROGRAM_CODE_HPP_INCLUDED
#include "database/vm/instructionSet.hpp"
#include <vector>
#include <cstdlib>
#include <limits>
#include <boost/shared_ptr.hpp>

namespace _Wolframe {
namespace db {
namespace vm {

class ProgramCode
{
public:
        typedef InstructionSet::Instruction Instruction;
        typedef InstructionSet::CondCode CondCode;
        typedef InstructionSet::OpCode OpCode;
        typedef InstructionSet::Address Address;

public:
        ProgramCode(){}
        ProgramCode( const ProgramCode& o)
                :m_ar(o.m_ar){}

        void add( const Instruction& instr)
        {
                m_ar.push_back( instr);
                if (m_ar.size() >= InstructionSet::Max_ArgumentIndex)
                {
                        throw std::runtime_error( "program code size out of range");
                }
        }
        Instruction& operator[]( const Address& adr)
        {
                if (adr >= m_ar.size()) throw std::runtime_error( "address out of bounds");
                return m_ar[ adr];
        }
        const Instruction& operator[]( const Address& adr) const
        {
                if (adr >= m_ar.size()) throw std::runtime_error( "address out of bounds");
                return m_ar[ adr];
        }

        Address size() const
        {
                return (Address)m_ar.size();
        }

        ProgramCode& operator()( CondCode cond, OpCode opcode, unsigned int arg=0)
        {
                add( InstructionSet::instruction( cond, opcode, arg));
                return *this;
        }
        ProgramCode& operator()( OpCode opcode, unsigned int arg=0)
        {
                CondCode cond = InstructionSet::Co_ALWAYS;
                add( InstructionSet::instruction( cond, opcode, arg));
                return *this;
        }

        void append( const ProgramCode& prg)
        {
                m_ar.insert( m_ar.end(), prg.begin(), prg.end());
        }

        Instruction get( Address& ip) const
        {
                if (ip >= m_ar.size()) return InstructionSet::instruction( InstructionSet::Co_ALWAYS, InstructionSet::Op_EXIT);
                return m_ar.at(ip);
        }

        typedef std::vector<Instruction>::const_iterator const_iterator;
        typedef std::vector<Instruction>::iterator iterator;

        const_iterator begin() const                                    {return m_ar.begin();}
        const_iterator end() const                                      {return m_ar.end();}
        iterator begin()                                                {return m_ar.begin();}
        iterator end()                                                  {return m_ar.end();}
        const_iterator at( const Address& adr) const                    {return m_ar.begin() + adr;}
        iterator at( const Address& adr)                                {return m_ar.begin() + adr;}

        void printRaw( std::ostream& out) const
        {
                InstructionSet::printProgramRaw( out, m_ar);
        }

private:
        std::vector<Instruction> m_ar;          //< array of instructions
};

}}}//namespace
#endif