PLI object handles

Many of the object handles returned by the PLI ACC routines are pointers to objects that naturally exist in the simulation data structures, and the handles to these objects are valid throughout the simulation, even after the acc_close() routine is called. However, some of the objects are created on demand, and the handles to these objects become invalid after acc_close() is called. The following object types are created on demand in ModelSim Verilog:

accOperator (acc_handle_condition)
accWirePath (acc_handle_path)
accTerminal (acc_handle_terminal, acc_next_cell_load, acc_next_driver, and
	acc_next_load)
accPathTerminal (acc_next_input and acc_next_output)
accTchkTerminal (acc_handle_tchkarg1 and acc_handle_tchkarg2)
accPartSelect (acc_handle_conn, acc_handle_pathin, and acc_handle_pathout)
accRegBit (acc_handle_by_name, acc_handle_tfarg, and acc_handle_itfarg) 

If your PLI application uses these types of objects, then it is important to call acc_close() to free the memory allocated for these objects when the application is done using them.

If your PLI application places value change callbacks on accRegBit or accTerminal objects, do not call acc_close() while these callbacks are in effect.

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