340 lines
9.8 KiB
Prolog
340 lines
9.8 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: checker.yap *
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* comments: style checker for Prolog *
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* *
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* Last rev: $Date: 2008-03-31 22:56:22 $,$Author: vsc $ *
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* $Log: not supported by cvs2svn $
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* Revision 1.23 2007/11/26 23:43:09 vsc
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* fixes to support threads and assert correctly, even if inefficiently.
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*
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* Revision 1.22 2006/11/17 12:10:46 vsc
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* style_checker was failing on DCGs
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*
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* Revision 1.21 2006/03/24 16:26:31 vsc
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* code review
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*
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* Revision 1.20 2005/11/05 23:56:10 vsc
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* should have meta-predicate definitions for calls,
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* multifile and discontiguous.
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* have discontiguous as a builtin, not just as a
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* declaration.
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*
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* Revision 1.19 2005/10/28 17:38:50 vsc
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* sveral updates
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*
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* Revision 1.18 2005/04/20 20:06:11 vsc
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* try to improve error handling and warnings from within consults.
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*
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* Revision 1.17 2005/04/20 04:08:20 vsc
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* fix warnings
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*
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* Revision 1.16 2005/01/13 05:47:27 vsc
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* lgamma broke arithmetic optimisation
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* integer_y has type y
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* pass original source to checker (and maybe even use option in parser)
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* use warning mechanism for checker messages.
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*
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* Revision 1.15 2004/06/29 19:12:01 vsc
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* fix checker messages
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*
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* Revision 1.14 2004/06/29 19:04:46 vsc
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* fix multithreaded version
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* include new version of Ricardo's profiler
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* new predicat atomic_concat
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* allow multithreaded-debugging
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* small fixes
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*
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* Revision 1.13 2004/03/19 11:35:42 vsc
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* trim_trail for default machine
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* be more aggressive about try-retry-trust chains.
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* - handle cases where block starts with a wait
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* - don't use _killed instructions, just let the thing rot by itself.
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* *
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* *
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*************************************************************************/
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%
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% A Small style checker for YAP
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:- op(1150, fx, multifile).
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style_check(V) :- var(V), !, fail.
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style_check(all) :- '$syntax_check_mode'(_,on),
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'$syntax_check_single_var'(_,on),
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'$syntax_check_discontiguous'(_,on),
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'$syntax_check_multiple'(_,on).
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style_check(single_var) :- '$syntax_check_mode'(_,on),
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'$syntax_check_single_var'(_,on).
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style_check(singleton) :-
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style_check(single_var).
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style_check(-single_var) :-
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no_style_check(single_var).
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style_check(-singleton) :-
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no_style_check(single_var).
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style_check(discontiguous) :- '$syntax_check_mode'(_,on),
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'$syntax_check_discontiguous'(_,on).
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style_check(-discontiguous) :-
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no_style_check(discontiguous).
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style_check(multiple) :- '$syntax_check_mode'(_,on),
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'$syntax_check_multiple'(_,on).
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style_check(-multiple) :-
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no_style_check(multiple).
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style_check([]).
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style_check([H|T]) :- style_check(H), style_check(T).
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no_style_check(V) :- var(V), !, fail.
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no_style_check(all) :- '$syntax_check_mode'(_,off),
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'$syntax_check_single_var'(_,off),
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'$syntax_check_discontiguous'(_,off),
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'$syntax_check_multiple'(_,off).
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no_style_check(single_var) :- '$syntax_check_mode'(_,off),
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'$syntax_check_single_var'(_,off).
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no_style_check(discontiguous) :- '$syntax_check_mode'(_,off),
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'$syntax_check_discontiguous'(_,off).
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no_style_check(multiple) :- '$syntax_check_mode'(_,on),
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'$syntax_check_multiple'(_,off).
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no_style_check([]).
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no_style_check([H|T]) :- no_style_check(H), no_style_check(T).
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'$syntax_check_mode'(O,N) :-
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'$values'('$syntaxcheckflag',O,N).
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'$syntax_check_single_var'(O,N) :-
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'$values'('$syntaxchecksinglevar',O,N).
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'$syntax_check_discontiguous'(O,N) :-
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'$values'('$syntaxcheckdiscontiguous',O,N).
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'$syntax_check_multiple'(O,N) :-
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'$values'('$syntaxcheckmultiple',O,N).
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% reset current state of style checker.
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'$init_style_check'(File) :-
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recorded('$predicate_defs','$predicate_defs'(_,_,_,File),R),
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erase(R),
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fail.
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'$init_style_check'(_).
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% style checker proper..
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'$check_term'(T,VL,P,_) :-
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get_value('$syntaxchecksinglevar',on),
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'$singletons_in_clause'(T, VL, Sv),
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Sv = [_|_],
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'$sv_warning'(Sv,T),
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fail.
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'$check_term'(T,_,P,M) :-
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get_value('$syntaxcheckdiscontiguous',on),
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'$xtract_head'(T,M,NM,_,F,A),
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% should always fail
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'$handle_discontiguous'(F,A,NM),
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fail.
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'$check_term'(T,_,P,M) :-
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get_value('$syntaxcheckmultiple',on),
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'$xtract_head'(T,M,NM,_,F,A),
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'$handle_multiple'(F,A,NM),
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fail.
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'$check_term'(T,_,_,M) :-
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once((
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get_value('$syntaxcheckdiscontiguous',on)
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;
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get_value('$syntaxcheckmultiple',on)
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)),
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nb_getval('$consulting_file',File),
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'$xtract_head'(T,M,NM,_,F,A),
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\+ (
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% allow duplicates if we are not the last predicate to have
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% been asserted.
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once(recorded('$predicate_defs','$predicate_defs'(F0,A0,M0,File),_)),
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F0 = F, A0 = A, M0 = NM
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),
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recorda('$predicate_defs','$predicate_defs'(F,A,NM,File),_),
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fail.
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'$check_term'(_,_,_,_).
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%
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% output a list of singleton variables...
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%
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'$singletons_in_clause'(T, VL, Sv) :-
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% first check which variables are not singleton
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'$non_singletons_in_term'(T,[],V2L),
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% bound them
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'$ground_vars'(V2L),
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% the remainder which do not start by _ are our target!
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'$sv_list'(VL, Sv).
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'$ground_vars'([]).
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'$ground_vars'(ground.V2L) :-
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'$ground_vars'(V2L).
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'$sv_list'([],[]).
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'$sv_list'([[95|_]._|T],L) :- !,
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'$sv_list'(T,L).
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'$sv_list'([_|V].T,L) :- nonvar(V), !,
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'$sv_list'(T,L).
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'$sv_list'([Name|_].T, Name.L) :-
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'$sv_list'(T,L).
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'$sv_warning'([], _) :- !.
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'$sv_warning'(SVs, T) :-
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'$current_module'(OM),
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'$xtract_head'(T, OM, M, H, Name, Arity),
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print_message(warning,singletons(SVs,(M:Name/Arity))).
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'$xtract_head'(V,M,M,V,call,1) :- var(V), !.
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'$xtract_head'((H:-_),OM,M,NH,Name,Arity) :- !,
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'$xtract_head'(H,OM,M,NH,Name,Arity).
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'$xtract_head'((H,_),OM,M,H1,Name,Arity) :- !,
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'$xtract_head'(H,OM,M,H1,Name,Arity).
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'$xtract_head'((H-->_),OM,M,HL,Name,Arity) :- !,
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'$xtract_head'(H,M,OM,_,Name,A1),
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Arity is A1+2,
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functor(HL,Name,Arity).
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'$xtract_head'(M:H,_,NM,NH,Name,Arity) :- !,
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'$xtract_head'(H,M,NM,NH,Name,Arity).
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'$xtract_head'(H,M,M,H,Name,Arity) :-
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functor(H,Name,Arity).
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% check if a predicate is discontiguous.
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'$handle_discontiguous'(F,A,M) :-
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recorded('$discontiguous_defs','$df'(F,A,M),_), !,
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fail.
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'$handle_discontiguous'(F,A,M) :-
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functor(Head, F, A),
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'$is_multifile'(Head, M), !,
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fail.
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'$handle_discontiguous'((:-),1,_) :- !,
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fail.
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'$handle_discontiguous'(F,A,M) :-
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nb_getval('$consulting_file', FileName),
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% we have been there before
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once(recorded('$predicate_defs','$predicate_defs'(F, A, M, FileName),_)),
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% and we are not
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\+ (
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% the last predicate to have been asserted
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once(recorded('$predicate_defs','$predicate_defs'(F0,A0,M0,FileName),_)),
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F0 = F, A0 = A, M0 = M
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),
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print_message(warning,clauses_not_together((M:F/A))),
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fail.
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% never complain the second time
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'$handle_multiple'(F,A,M) :-
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nb_getval('$consulting_file', FileName),
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recorded('$predicate_defs','$predicate_defs'(F,A,M,FileName),_), !.
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% first time we have a definition
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'$handle_multiple'(F,A,M) :-
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nb_getval('$consulting_file', FileName0),
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recorded('$predicate_defs','$predicate_defs'(F,A,M,FileName),_),
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FileName \= FileName0,
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'$multiple_has_been_defined'(FileName, F/A, M), !.
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% be careful about these cases.
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% consult does not count
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'$multiple_has_been_defined'(_, _, _) :-
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nb_getval('$consulting',true), !.
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% multifile does not count
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'$multiple_has_been_defined'(_, F/A, M) :-
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functor(S, F, A),
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'$is_multifile'(S, M), !.
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'$multiple_has_been_defined'(Fil,F/A,M) :-
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% first, clean up all definitions in other files
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% don't forget, we just removed everything.
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recorded('$predicate_defs','$predicate_defs'(F,A,M,FileName),R),
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erase(R),
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fail.
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'$multiple_has_been_defined'(Fil,P,M) :-
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print_message(warning,defined_elsewhere(M:P,Fil)).
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multifile(P) :-
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'$current_module'(OM),
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'$multifile'(P, M).
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'$multifile'(V, _) :- var(V), !,
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'$do_error'(instantiation_error,multifile(V)).
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'$multifile'((X,Y), M) :- !, '$multifile'(X, M), '$multifile'(Y, M).
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'$multifile'(Mod:PredSpec, _) :- !,
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'$multifile'(PredSpec, Mod).
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'$multifile'(N//A, M) :- !,
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integer(A),
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A1 is A+2,
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'$multifile'(N/A1, M).
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'$multifile'(N/A, M) :-
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'$add_multifile'(N,A,M),
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fail.
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'$multifile'(N/A, M) :-
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functor(S,N,A),
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'$is_multifile'(S, M), !.
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'$multifile'(N/A, M) :- !,
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'$new_multifile'(N,A,M).
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'$multifile'([H|T], M) :- !,
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'$multifile'(H,M),
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'$multifile'(T,M).
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'$multifile'(P, M) :-
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'$do_error'(type_error(predicate_indicator,P),multifile(M:P)).
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discontiguous(V) :-
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var(V), !,
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'$do_error'(instantiation_error,discontiguous(V)).
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discontiguous(M:F) :- !,
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'$discontiguous'(F,M).
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discontiguous(F) :-
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'$current_module'(M),
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'$discontiguous'(F,M).
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'$discontiguous'(V,M) :- var(V), !,
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'$do_error'(instantiation_error,M:discontiguous(V)).
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'$discontiguous'((X,Y),M) :- !,
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'$discontiguous'(X,M),
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'$discontiguous'(Y,M).
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'$discontiguous'(M:A,_) :- !,
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'$discontiguous'(A,M).
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'$discontiguous'(N//A1, M) :- !,
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integer(A1), !,
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A is A1+2,
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'$discontiguous'(N/A, M).
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'$discontiguous'(N/A, M) :- !,
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( recordzifnot('$discontiguous_defs','$df'(N,A,M),_) ->
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true
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;
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true
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).
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'$discontiguous'(P,M) :-
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'$do_error'(type_error(predicate_indicator,P),M:discontiguous(P)).
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%
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% did we declare multifile properly?
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%
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'$check_multifile_pred'(Hd, M, _) :-
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functor(Hd,Na,Ar),
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nb_getval('$consulting_file',F),
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recorded('$multifile_defs','$defined'(F,Na,Ar,M),_), !.
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% oops, we did not.
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'$check_multifile_pred'(Hd, M, Fl) :-
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% so this is not a multi-file predicate any longer.
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functor(Hd,Na,Ar),
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NFl is \(0x20000000) /\ Fl,
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'$flags'(Hd,M,Fl,NFl),
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'$warn_mfile'(Na,Ar).
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'$warn_mfile'(F,A) :-
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write(user_error,'% Warning: predicate '),
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write(user_error,F/A), write(user_error,' was a multifile predicate '),
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write(user_error,' (line '),
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'$start_line'(LN), write(user_error,LN),
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write(user_error,')'),
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nl(user_error).
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