Difference between revisions of "Logic Programming"
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== Syntax/Semantics for Input/Output == | == Syntax/Semantics for Input/Output == | ||
| − | The set of queries, for which termination should be analyzed, is | + | The set of queries, for which termination should be analyzed, is |
| − | given by a comment in the first | + | given by a comment of the form "%query: <predicate>(<arguments>).". |
| + | Here, <predicate> is the root symbol of all queries to analyze | ||
| + | while <arguments> is a comma-separated list of argument indicators | ||
| + | which specify whether the argument at the particular position must | ||
| + | be a ground term or can be an arbitrary term. There are three pairs | ||
| + | of argument indicators in use (historically grown) where the first | ||
| + | indicator specifies ground arguments and the second specifies | ||
| + | arbitrary arguments: i and o (for input and output), b and f (for | ||
| + | bound and free), and g and a (for ground and any). | ||
| + | Example: | ||
%query: p(i,o). | %query: p(i,o). | ||
| Line 13: | Line 22: | ||
This means all queries :- p(s,t). where s is a ground term | This means all queries :- p(s,t). where s is a ground term | ||
and t can be any term. | and t can be any term. | ||
| + | If the root symbol has no arguments, the parantheses are omitted. | ||
| + | Example: | ||
| + | |||
| + | %query: p. | ||
== Problematic Examples == | == Problematic Examples == | ||
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* do we want to have a (sub-)category "pure logic programs"? | * do we want to have a (sub-)category "pure logic programs"? | ||
| − | == Unification with or without Occurs | + | == Unification with or without Occurs Check == |
Currently, there are some examples in the LP-Prolog category where | Currently, there are some examples in the LP-Prolog category where | ||
termination depends on whether unification is performed with or | termination depends on whether unification is performed with or | ||
| − | without the occurs | + | without the occurs check. Following the treatment of overflows in |
the Java categories, in such cases both YES and NO answers (with | the Java categories, in such cases both YES and NO answers (with | ||
consistent proofs) are valid. | consistent proofs) are valid. | ||
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The following is a list of participants to this category | The following is a list of participants to this category | ||
* [[Tools:AProVE]] | * [[Tools:AProVE]] | ||
| + | * [[Tools:NTI]] | ||
[[Category:Categories]] | [[Category:Categories]] | ||
Latest revision as of 04:56, 19 November 2020
This page is to record the current status of discussion on cleaning up the Logic Programming Category of the Termination Competition.
(Discussion should take place on the termtools mailing list.)
Contents
Syntax/Semantics for Input/Output
The set of queries, for which termination should be analyzed, is given by a comment of the form "%query: <predicate>(<arguments>).". Here, <predicate> is the root symbol of all queries to analyze while <arguments> is a comma-separated list of argument indicators which specify whether the argument at the particular position must be a ground term or can be an arbitrary term. There are three pairs of argument indicators in use (historically grown) where the first indicator specifies ground arguments and the second specifies arbitrary arguments: i and o (for input and output), b and f (for bound and free), and g and a (for ground and any). Example:
%query: p(i,o).
This means all queries :- p(s,t). where s is a ground term and t can be any term. If the root symbol has no arguments, the parantheses are omitted. Example:
%query: p.
Problematic Examples
The following examples are empty:
- LP/talp/apt/dc_mod.pl
- LP/talp/apt/gt_mod.pl
The following examples contain non-trivial built-in predicates that are potentially handled in very different ways by the individual tools (leading to potentially different termination status):
- LP/lpexamples/factorial.pl
- LP/lpexamples/fib-oi.pl
- LP/lpexamples/fib.pl
- LP/lpexamples/hanoi.pl
- LP/lpexamples/kay4.pl
- LP/lpexamples/numbervars.pl
- LP/lpexamples/primes.pl
- LP/lpexamples/tautology.pl
- LP/lpexamples/totient.pl
- LP/talp/apt/curry_ap.pl
- LP/talp/apt/dc_mod.pl
- LP/talp/apt/dc_schema.pl
- LP/talp/apt/gt_mod.pl
- LP/talp/apt/gtsolve.pl
- LP/talp/apt/mergesort_ap_variant.pl
- LP/talp/maria/aiakl.pl
- LP/talp/maria/ann.pl
- LP/talp/maria/bid.pl
- LP/talp/maria/boyer.pl
- LP/talp/maria/browse.pl
- LP/talp/maria/deriv-oii.pl
- LP/talp/maria/deriv.pl
- LP/talp/maria/fib.pl
- LP/talp/maria/grammar.pl
- LP/talp/maria/grammar2.pl
- LP/talp/maria/hanoiapp.pl
- LP/talp/maria/mmatrix.pl
- LP/talp/maria/money.pl
- LP/talp/maria/occur.pl
- LP/talp/maria/peephole.pl
- LP/talp/maria/progeom.pl
- LP/talp/maria/qplan.pl
- LP/talp/maria/qsortapp.pl
- LP/talp/maria/query.pl
- LP/talp/maria/rdtok.pl
- LP/talp/maria/read.pl
- LP/talp/maria/serialize.pl
- LP/talp/maria/tak.pl
- LP/talp/maria/tictactoe.pl
- LP/talp/maria/warplan.pl
- LP/talp/taboch/permute2.pl
- LP/talp/taboch/queens.pl
- LP/terminweb/old-terminweb/mergesort.pl
- LP/terminweb/old-terminweb/queens.pl
- LP/terminweb/old-terminweb/quicksort.pl
Questions
- should empty examples be removed?
- how to handle built-ins that the tool does not support?
- do we want to have a (sub-)category "pure logic programs"?
Unification with or without Occurs Check
Currently, there are some examples in the LP-Prolog category where termination depends on whether unification is performed with or without the occurs check. Following the treatment of overflows in the Java categories, in such cases both YES and NO answers (with consistent proofs) are valid.
Participants
The following is a list of participants to this category
