157 lines
5.0 KiB
Prolog
157 lines
5.0 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: preds.yap *
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* Last rev: 8/2/88 *
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* mods: *
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* comments: Predicate Manipulation for YAP: declaration support *
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* *
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*************************************************************************/
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:- system_module( '$_preddecls', [(discontiguous)/1,
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(dynamic)/1,
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(multifile)/1,
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(discontiguous)/1], ['$check_multifile_pred'/3,
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'$discontiguous'/2,
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'$dynamic'/2]).
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:- use_system_module( '$_consult', ['$add_multifile'/3]).
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:- use_system_module( '$_errors', ['$do_error'/2]).
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%
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% can only do as goal in YAP mode.
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%
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dynamic(X) :- '$access_yap_flags'(8, 0), !,
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'$current_module'(M),
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'$dynamic'(X, M).
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dynamic(X) :-
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'$do_error'(context_error(dynamic(X),declaration),query).
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'$dynamic'(X,M) :- var(X), !,
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'$do_error'(instantiation_error,dynamic(M:X)).
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'$dynamic'(Mod:Spec,_) :- !,
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'$dynamic'(Spec,Mod).
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'$dynamic'([], _) :- !.
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'$dynamic'([H|L], M) :- !, '$dynamic'(H, M), '$dynamic'(L, M).
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'$dynamic'((A,B),M) :- !, '$dynamic'(A,M), '$dynamic'(B,M).
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'$dynamic'(X,M) :-
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'$dynamic2'(X,M).
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'$dynamic2'(X, Mod) :- '$log_upd'(Stat), Stat\=0, !,
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'$logical_updatable'(X, Mod).
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'$dynamic2'(A//N1, Mod) :-
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integer(N1),
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N is N1+2,
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'$dynamic2'(A/N, Mod).
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'$dynamic2'(A/N, Mod) :-
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integer(N), atom(A), !,
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functor(T,A,N), '$flags'(T,Mod,F,F),
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% LogUpd,BinaryTest,Safe,C,Dynamic,Compiled,Standard,Asm,
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( F/\ 0x19D1FA80 =:= 0, '$undefined'(T,Mod) -> NF is F \/ 0x00002000, '$flags'(T, Mod, F, NF), '$mk_d'(T,Mod);
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F /\ 0x00002000 =:= 0x00002000 -> '$mk_d'(T,Mod); % dynamic
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F /\ 0x08000000 =:= 0x08000000 -> '$mk_d'(T,Mod) ; % LU
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F /\ 0x00000400 =:= 0x00000400, '$undefined'(T,Mod) -> F1 is F /\ \(0x400), N1F is F1 \/ 0x00002000, NF is N1F /\ \(0x00400000), '$flags'(T,Mod,F,NF), '$mk_d'(T,Mod);
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'$do_error'(permission_error(modify,static_procedure,A/N),dynamic(Mod:A/N))
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).
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'$dynamic2'(X,Mod) :-
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'$do_error'(type_error(callable,X),dynamic(Mod:X)).
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'$logical_updatable'(A//N,Mod) :- integer(N), !,
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N1 is N+2,
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'$logical_updatable'(A/N1,Mod).
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'$logical_updatable'(A/N,Mod) :- integer(N), atom(A), !,
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functor(T,A,N), '$flags'(T,Mod,F,F),
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(
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F/\ 0x19D1FA80 =:= 0, '$undefined'(T,Mod) -> NF is F \/ 0x08000400, '$flags'(T,Mod,F,NF), '$mk_d'(T,Mod);
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F /\ 0x08000000 =:= 0x08000000 -> '$mk_d'(T,Mod) ; % LU
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F /\ 0x00002000 =:= 0x00002000 -> '$mk_d'(T,Mod); % dynamic
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F /\ 0x00000400 =:= 0x00000400 , '$undefined'(T,Mod) -> N1F is F \/ 0x08000000, NF is N1F /\ \(0x00400000), '$flags'(T,Mod,F,NF), '$mk_d'(T,Mod);
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'$do_error'(permission_error(modify,static_procedure,A/N),dynamic(Mod:A/N))
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).
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'$logical_updatable'(X,Mod) :-
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'$do_error'(type_error(callable,X),dynamic(Mod:X)).
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multifile(P) :-
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'$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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'$discontiguous'(N/A, M) :- !,
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'$new_discontiguous'(N,A,M).
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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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'$check_multifile_pred'(Hd, M, _) :-
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functor(Hd,Na,Ar),
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source_location(F, _),
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recorded('$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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