src/Decoder.h

   1 #ifndef AVR_DECODER_H
   2 #define AVR_DECODER_H
   3
   4 #include <vector>
   5 #include "Types.h"
   6
   7 namespace avr {
   8
   9         class Instruction;
  10
  11         /**
  12          * @author Tom Haber
  13          * @date Apr 23, 2008
  14          * @brief Instruction Decoder
  15          *
  16          * The decoder can decode instruction opcodes and returns
  17          * Instruction classes capable of executing the instruction.
  18          *
  19          * For performance reasons, it contains a big table with all
  20          * possible opcodes and accompanying Instruction instance.
  21          */
  22         class Decoder {
  23                 public:
  24                         Decoder();
  25                         ~Decoder();
  26
  27                 public:
  28                         Instruction & decode( word opcode ) const;
  29                         bool is2WordInstruction( word opcode ) const;
  30
  31                 private:
  32                         Instruction *lookupOpcode( word opcode );
  33
  34                 private:
  35                         std::vector<Instruction *> lut;
  36         };
  37
  38         inline Instruction & Decoder::decode( word opcode ) const {
  39                 return *lut[opcode];
  40         }
  41
  42 }
  43
  44 #endif /*AVR_DECODER_H*/