Download Functional and Logic Programming: 5th International by Gopalan Nadathur (auth.), Herbert Kuchen, Kazunori Ueda PDF

Download Functional and Logic Programming: 5th International by Gopalan Nadathur (auth.), Herbert Kuchen, Kazunori Ueda PDF

By Gopalan Nadathur (auth.), Herbert Kuchen, Kazunori Ueda (eds.)

This publication constitutes the refereed court cases of the fifth overseas Symposium on useful and good judgment Programming, FLOPS 2001, held in Tokyo, Japan in March 2001.
The 21 revised complete papers offered including 3 invited papers have been rigorously reviewed and chosen from forty submissions. The booklet bargains topical sections on useful programming, common sense programming, practical good judgment programming, varieties, software research and transformation, and Lambda calculus.

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Extra info for Functional and Logic Programming: 5th International Symposium, FLOPS 2001 Tokyo, Japan, March 7–9, 2001 Proceedings

Example text

While oracles can be consumed a few bits at a time, the LFi syntactic representation of a proof must be entirely brought in memory for checking. While we have not measured precisely the memory usage we encountered examples whose oracles can be checked using less than 1Mbyte of memory while the checking of the corresponding LFi terms could not be performed even with 1Gbyte of virtual memory. 6 Conclusion We presented in this paper an architecture for Proof-Carrying Code where proofs are replaced by an oracle guiding a non-deterministic checker for a given safety policy.

In such a diverse environment there is a need for a general mechanism that can be used to allow even untrusted system extensions to be integrated into an existing software system without compromising the stability and security of the host system. Proof-Carrying Code (PCC) [NL96, Nec97] was designed to be a general mechanism that allows the receiver of code (referred to as the host) to check This research was supported in part by the National Science Foundation Grants No. CCR-9875171, CCR-0085949 and CCR-0081588 and by gifts from AT&T and Microsoft Corporation.

One is that in PCC the logic program is dynamic since assumptions (represented as logic facts) are added and retracted from the system as the symbolic execution follows different paths through the agent. However, this happens only in between two separate invocations of the Checker. The second and more important difference is that while a traditional interpreter selects clauses by trying them in order and backtracking on failure, the Checker is a non-deterministic logic interpreter meaning that it “guesses” the right clause to use at each step.

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