|[2 earlier articles]|
|Re: gawk memory leak email@example.com (1997-04-03)|
|Re: gawk memory leak firstname.lastname@example.org (1997-04-06)|
|Re: gawk memory leak pfoxSPAMOFF@lehman.com (Paul David Fox) (1997-04-13)|
|Purify patent (was Re: gawk memory leak) email@example.com (Elan Feingold) (1997-05-04)|
|Re: Purify patent (was Re: gawk memory leak) firstname.lastname@example.org (Sailesh Krishnamurthy) (1997-05-08)|
|Re: Purify patent (was Re: gawk memory leak) email@example.com (1997-05-08)|
|Re: Purify patent (was Re: gawk memory leak) firstname.lastname@example.org (Duncan Smith) (1997-05-09)|
|Re: Purify patent (was Re: gawk memory leak) email@example.com (Paul David Fox) (1997-05-13)|
|Re: Purify patent (was Re: gawk memory leak) firstname.lastname@example.org (Hans-Juergen Boehm) (1997-05-17)|
|From:||Duncan Smith <email@example.com>|
|Date:||9 May 1997 00:52:44 -0400|
|Organization:||Flavors Technology, Inc.|
|References:||97-03-165 97-04-020 97-04-022 97-04-037 97-04-070 97-05-019 97-05-090|
|Keywords:||legal, linker, debug|
Sailesh Krishnamurthy wrote:
> Paul David Fox wrote:
> >> I did some research into the Purify patent. There are
> >> actually 3 inter-related ones. I havent got the reference
> >> to hand but the substance of the patent is 'Use of object
> >> code modification to facilitate memory tracking and
> >> leakage detection'.
Anthony V. Ingenoso and I wrote a simple one of these in 1984 at the New
Technology Division of Interactive Data Corp, Waltham, MA. I am
surprised someone obtained a patent on somthing like this.
It was called the Pointer Checker and inserted bounds checks for FAR
pointer stores for Lattice C 2.5 object files. FAR writes and RMWs were
recognizable by their ES segment overrides. As a bonus it generated
optimized (packed and threaded) object files.
The reaching code walker had to understand the 3 different forms of
"switch" statements in order to walk the "case" branch tables embedded
in the code segments. It was a nice utility and saved the C programmers
a lot of debugging time. This right around the time of the PCAT and DOS
I wanted inline checks, but Tony opted for out of line which eliminated
motion of the surrounding code.
Flavors Technology, Inc.
[Software patents are a notorious morass, and one of the worst problems is
that the patent office completely unfamiliar with the prior art. -John]
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