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- Path: sparky!uunet!pipex!unipalm!uknet!mcsun!sunic!liuida!henni
- From: henni@ida.liu.se (Henrik Nilsson)
- Newsgroups: comp.lang.functional
- Subject: Algorithmic Debugging for Lazy Functional Languages
- Message-ID: <1992Aug19.133753.7451@ida.liu.se>
- Date: 19 Aug 92 13:37:53 GMT
- References: <1992Jul12.061122.8943@eng.umd.edu> <NICKH.92Jul14151920@VOILA.VENARI.CS.CMU.EDU> <1992Jul14.205627.25659@eng.umd.edu> <DELACOUR.92Jul14152041@waxwing.parc.xerox.com> <SCHIEX.92Aug18143749@jupiter.cert.fr>
- Sender: news@ida.liu.se
- Organization: CIS Dept, Univ of Linkoping, Sweden
- Lines: 45
-
- schiex@cert.fr (Thomas Schiex) writes:
-
- [examples illustrating the usefulness of laziness deleted]
-
- >All these GOOD thing have too be payed in terms of time (small overhead, so
- >small it is negligible). But the main issue is DEBUGGING which is very
- >difficult. Sequencing is completly disturbed and the poor human is lost when
- >tracing ! (obvious relations with concurrent processing). However some
- >papers gives interesting debugging issues for lazy languages (for Daisy, see
- >"Lisp and symbolic computations", in the first numbers).
-
- Our group has been involved in research on algorithmic debugging for some time
- and recently we have applied this technique to lazy functional languages with
- some success. However, several difficult problems remain to be solved before
- this can be regared as a practical approach.
-
- In algorithmic debugging, the program to be debugged is first executed and a
- complete execution trace tree is built at the procedure/function level. This
- tree is then searched top-down for the procedure/function invocation that
- caused the entire program to misbehave, and once this invocation is found it
- is concluded that the bug is inside the corresponding procedure/function.
- The user must aid the debugger in this search by answering questions regarding
- whether or not invocations behaved correctly. Thus the user need not concern
- himself with operational aspects such as execution order but can concentrate
- on the declarative semantics of the program instead.
-
- I'm going to present a paper on this topic at PLILP'92 next week and I'll be
- happy to e-mail copies (postscript) of it to anyone who is interested.
-
-
-
- --
-
- Henrik Nilsson (henni@ida.liu.se)
- Department of Computer and Information Science
- Linkoping University
- S-581 83 Linkoping
- Sweden
- --
-
- Henrik Nilsson (henni@ida.liu.se)
- Department of Computer and Information Science
- Linkoping University
- S-581 83 Linkoping
- Sweden
-