1/*  Part of SWI-Prolog
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        J.Wielemaker@vu.nl
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (c)  2017, VU University Amsterdam
    7			 CWI Amsterdam
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
   14    1. Redistributions of source code must retain the above copyright
   15       notice, this list of conditions and the following disclaimer.
   16
   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
   19       the documentation and/or other materials provided with the
   20       distribution.
   21
   22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   25    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   26    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   27    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   28    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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   33    POSSIBILITY OF SUCH DAMAGE.
   34*/
   35
   36:- module(prolog_jiti,
   37          [ jiti_list/0,
   38            jiti_list/1                         % +Spec
   39          ]).   40:- autoload(library(apply),[maplist/2]).   41:- autoload(library(dcg/basics),[number/3]).   42
   43
   44:- meta_predicate
   45    jiti_list(:).

 jiti_list is det

 jiti_list(:Spec) is det

List the JITI (Just In Time Indexes) of selected predicates. The predicate jiti_list/0 list all just-in-time indexed predicates. The predicate jiti_list/1 takes one of the patterns below. All parts except for Name can be variables. The last pattern takes an arbitrary number of arguments.

• Module:Head
• Module:Name/Arity
• Module:Name

The columns use the following notation:

• The Indexed column describes the argument(s) indexed:
  • A plain integer refers to a 1-based argument number
  • A+B is a multi-argument index on the arguments A and B.
  • A/B is a deep-index on sub-argument B of argument A.
• The Buckets specifies the number of buckets of the hash table
• The Speedup specifies the selectivity of the index
• The Flags describes additional properties, currently:
  • L denotes that the index contains multiple compound terms with the same name/arity that may be used to create deep indexes. The deep indexes themselves are created as just-in-time indexes.

   83jiti_list :-
   84    jiti_list(_:_).
   85
   86jiti_list(Module:Name/Arity) :-
   87    atom(Name),
   88    integer(Arity),
   89    !,
   90    functor(Head, Name, Arity),
   91    jiti_list(Module:Head).
   92jiti_list(Module:Name/Arity) :-
   93    atom(Name),
   94    var(Arity),
   95    !,
   96    freeze(Head, functor(Head, Name, _)),
   97    jiti_list(Module:Head).
   98jiti_list(Module:Name) :-
   99    atom(Name),
  100    !,
  101    freeze(Head, functor(Head, Name, _)),
  102    jiti_list(Module:Head).
  103jiti_list(Head) :-
  104    findall(Head-Indexed,
  105            (   predicate_property(Head, indexed(Indexed)),
  106                \+ predicate_property(Head, imported_from(_))
  107            ), Pairs),
  108    format('Predicate~46|~w ~t~8+ ~t~w~6+ ~t~w~6+ ~t~w~5+~n',
  109           ['Indexed','Buckets','Speedup','Flags']),
  110    format('~`=t~76|~n'),
  111    maplist(print_indexed, Pairs).
  112
  113print_indexed((M:Head)-[Args-hash(Buckets,Speedup,_Size,List)|More]) :-
  114    functor(Head, Name, Arity),
  115    phrase(iarg_spec(Args), ArgsS),
  116    phrase(iflags(List), Flags),
  117    format('~q ~t~48|~s ~t~8+ ~t~D~6+ ~t~1f~8+ ~t~s~3+~n',
  118           [M:Name/Arity, ArgsS,Buckets,Speedup,Flags]),
  119    maplist(print_secondary_index, More),
  120    !.
  121print_indexed(Pair) :-
  122    format('Failed: ~p~n', [Pair]).
  123
  124print_secondary_index(Args-hash(Buckets,Speedup,_Size,List)) :-
  125    phrase(iarg_spec(Args), ArgsS),
  126    phrase(iflags(List), Flags),
  127    format('~t~48|~s ~t~8+ ~t~D~6+ ~t~1f~8+ ~t~s~3+~n',
  128           [ArgsS,Buckets,Speedup,Flags]),
  129    !.
  130print_secondary_index(Pair) :-
  131    format('Secondary failed: ~p~n', [Pair]).
  132
  133iarg_spec(single(N)) -->
  134    number(N).
  135iarg_spec(multi(L)) -->
  136    plus_list(L).
  137iarg_spec(deep(List)) -->
  138    deep_list(List).
  139
  140plus_list([H|T]) -->
  141    number(H),
  142    (   {T==[]}
  143    ->  []
  144    ;   "+",
  145        plus_list(T)
  146    ).
  147
  148deep_list([Last]) -->
  149    !,
  150    iarg_spec(Last).
  151deep_list([H|T]) -->
  152    number(H),
  153    "/",
  154    deep_list(T).
  155
  156
  157iflags(true)  --> "L".
  158iflags(false) --> ""