Enhanced stack unwind facility

Details Enhanced stack unwind facility Enhanced stack unwind facility

1997-05-29

2000-01-11

Oberley, Alvin E.

G06F 945

Patent

active

060145153

ABSTRACT:
An enhanced unwind facility is more extensible, much faster, and uses smaller tables than presently known schemes. In broad terms, the unwind facility trades bytes that are used for addresses and region lengths in known schemes for a stream of bit fields parallel to the instruction stream. This arrangement allows an unwind library to compute a current regions' attributes by indexing instead of by a binary search. This arrangement also leads to an extensible design that does not require significant effort on an occurrence-by-occurrence basis in both the linker and the unwind library when additional services are required, e.g. register use areas for the debugging of optimized code.

REFERENCES:
patent: 5428759 (1995-06-01), Smith et al.
patent: 5628016 (1997-05-01), Kukol
Himelstein et al., "A RISC Approach to Runtime Exceptions", Summer Usenix '88, San Francisco, Jun. 20-24, pp. 239-249.
HP 3000/930 and HP 9000/840 Comptuers, Procedure Calling Conventions Manual, "Stack Unwinding", Jan. 31, 1991.

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