Appeal No. 95-3042
Application No. 08/098,501
information to a user; said data processor having a plurality of
registers; said computer program including a sequence of
instructions; said method comprising the steps of:
a) executing said sequence of instructions in a
forward direction in order to create a current state of
said memory and said registers for said computer program,
maintaining said current state, and, for each instruction
that is executed, recording in a main log pre-existing
values of any registers and memory locations that are
changed by said each instruction, whereby said main log
does not include said current state; and
b) after said step a), simulating reverse execution of
said computer program by displaying to said user contents
of specified ones of said registers and memory locations
that existed during forward execution of the computer
program at a specified time in the past; wherein the
contents of the specified ones of said registers and memory
locations are reconstructed for said computer program by
performing the steps comprising
i) forward searching in said main log for entries
that include values of said specified ones of said
registers and memory locations; wherein, for each of
said specified ones of said registers and memory
locations, said main log is searched beginning at a
location corresponding to said specified time in the
past and continuing until either a value is found for
said each of said specified ones of said registers and
memory locations or until an end of said main log is
reached, and
ii) when the end of said main log is reached,
obtaining a value from said current state for said
each of said specified ones of said registers and
memory locations for which a value had not been found
in said main log.
The examiner relies on the following references:
Padawer et al. (Padawer) 5,124,989 Jun. 23, 1992
2
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007