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yap-6.3/pl/protect.yap
Vitor Santos Costa 46d997713f memory handling
2017-09-26 15:15:15 +01:00

80 lines
2.2 KiB
Prolog
Executable File

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: protect.yap *
* Last rev: *
* mods: *
* comments: protecting the system functions *
* *
*************************************************************************/
:- system_module( '$_protect', [], ['$protect'/0]).
/**
* @file protect.yap
* @addgroup ProtectCore Freeze System Configuration
* @ingroup CoreUtilities
*
* This protects current code from further changes
* and also makes it impossible for some predicates to be seen
* in user-space.
*
* Algorithm:
* - fix system modules
* - fix system predicates
* - hide atoms with `$`
*/
'$protect' :-
'$all_current_modules'(M),
( sub_atom(M,0,1,_, '$') ; M= prolog; M= system ),
new_system_module( M ),
fail.
'$protect' :-
'$current_predicate'(Name,M,P,_),
'$is_system_module'(M),
functor(P,Name,Arity),
'$new_system_predicate'(Name,Arity,M),
sub_atom(Name,0,1,_, '$'),
functor(P,Name,Arity),
'$hide_predicate'(P,M),
fail.
'$protect' :-
current_atom(Name),
sub_atom(Name,0,1,_, '$'),
\+ '$visible'(Name),
hide_atom(Name),
fail.
'$protect'.
% hide all atoms who start by '$'
'$visible'('$'). /* not $VAR */
'$visible'('$VAR'). /* not $VAR */
'$visible'('$dbref'). /* not stream position */
'$visible'('$stream'). /* not $STREAM */
'$visible'('$stream_position'). /* not stream position */
'$visible'('$hacks').
'$visible'('$source_location').
'$visible'('$messages').
'$visible'('$push_input_context').
'$visible'('$pop_input_context').
'$visible'('$set_source_module').
'$visible'('$declare_module').
'$visible'('$store_clause').
'$visible'('$skip_list').
'$visible'('$win_insert_menu_item').
'$visible'('$set_predicate_attribute').
'$visible'('$parse_quasi_quotations').
'$visible'('$quasi_quotation').
'$visible'('$qq_open').
'$visible'('$live').
'$visible'('$init_prolog').