ERROR DETECTION METHOD OF SOFTWARE PROGRAM

摘要

PURPOSE: To permit a software program to detect an error for de-referring to an invalid pointer. CONSTITUTION: Pointer information containing the content of a pointer which is known last and the valid memory range of the pointer is stored in a cache memory 74 on the respective pointers. Whenever the software program detects that a new value is substituted for the pointer, pointer information is updated. Whenever the software program de-refers to the pointer, an execution time pointer inspection sub-routine is mounted. The sub-routine retrieves pointer information on the de-referred pointer, obtains the actual content of the pointer from a memory position where the pointer is stored and judges whether a memory space indicated by the content is within the valid memory range or not unless the actual content is equal to the content recorded in pointer information.