// Dispatch code executed in the prolog of a bytecode which does not do it's
// own dispatch. The dispatch address is computed and placed in IdispatchAddress

void InterpreterMacroAssembler::dispatch_prolog(TosState state, int bcp_incr) {

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      assert_not_delayed();

  {- -------------------------------------------
  (1) コード生成:
      「次のバイトコード, および実行後の TosState に基づいて
        dispatch table から次のバイトコードに対応するテンプレートのエントリポイントアドレスを取得し, 
        IdispatchAddress レジスタに格納する」
      ---------------------------------------- -}

    #ifdef FAST_DISPATCH
      // FAST_DISPATCH and ProfileInterpreter are mutually exclusive since
      // they both use I2.
      assert(!ProfileInterpreter, "FAST_DISPATCH and +ProfileInterpreter are mutually exclusive");
      ldub(Lbcp, bcp_incr, Lbyte_code);                     // load next bytecode
      add(Lbyte_code, Interpreter::distance_from_dispatch_table(state), Lbyte_code);
                                                            // add offset to correct dispatch table
      sll(Lbyte_code, LogBytesPerWord, Lbyte_code);         // multiply by wordSize
      ld_ptr(IdispatchTables, Lbyte_code, IdispatchAddress);// get entry addr
    #else
      ldub( Lbcp, bcp_incr, Lbyte_code);                    // load next bytecode
      // dispatch table to use
      AddressLiteral tbl(Interpreter::dispatch_table(state));
      sll(Lbyte_code, LogBytesPerWord, Lbyte_code);         // multiply by wordSize
      set(tbl, G3_scratch);                                 // compute addr of table
      ld_ptr(G3_scratch, Lbyte_code, IdispatchAddress);     // get entry addr
    #endif
    }