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yap-6.3/pl/utils.yap
vsc 540d9639cb fix bad change in utils.yap 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@787 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2003-02-21 19:27:40 +00:00

748 lines
23 KiB
Prolog
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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: utils.yap *
* Last rev: 8/2/88 *
* mods: *
* comments: Some utility predicates available in yap *
* *
*************************************************************************/
once(G) :- '$execute'(G), !.
if(X,Y,_Z) :-
CP is '$last_choice_pt',
'$execute'(X),
'$clean_ifcp'(CP),
'$execute'(Y).
if(_X,_Y,Z) :-
'$execute'(Z).
call_with_args(M:V) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V)).
call_with_args(M:A) :- !,
'$call_with_args'(A,M).
call_with_args(A) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,M).
call_with_args(A) :-
'$do_error'(type_error(atom,A),call_with_args(A)).
call_with_args(M:V,A1) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1)).
call_with_args(M:A,A1) :- !,
'$call_with_args'(A,A1,M).
call_with_args(A,A1) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,M).
call_with_args(A,A1) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1)).
call_with_args(M:V,A1,A2) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2)).
call_with_args(M:A,A1,A2) :- !,
'$call_with_args'(A,A1,A2,M).
call_with_args(A,A1,A2) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,M).
call_with_args(A,A1,A2) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2)).
call_with_args(M:V,A1,A2,A3) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3)).
call_with_args(M:A,A1,A2,A3) :- !,
'$call_with_args'(A,A1,A2,A3,M).
call_with_args(A,A1,A2,A3) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,M).
call_with_args(A,A1,A2,A3) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3)).
call_with_args(M:V,A1,A2,A3,A4) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4)).
call_with_args(M:A,A1,A2,A3,A4) :- !,
'$call_with_args'(A,A1,A2,A3,A4,M).
call_with_args(A,A1,A2,A3,A4) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,A4,M).
call_with_args(A,A1,A2,A3,A4) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4)).
call_with_args(M:V,A1,A2,A3,A4,A5) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5)).
call_with_args(M:A,A1,A2,A3,A4,A5) :- !,
'$call_with_args'(A,A1,A2,A3,A4,A5,M).
call_with_args(A,A1,A2,A3,A4,A5) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,A4,A5,M).
call_with_args(A,A1,A2,A3,A4,A5) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5)).
call_with_args(M:V,A1,A2,A3,A4,A5,A6) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6)).
call_with_args(M:A,A1,A2,A3,A4,A5,A6) :- !,
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,M).
call_with_args(A,A1,A2,A3,A4,A5,A6) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,M).
call_with_args(A,A1,A2,A3,A4,A5,A6) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6)).
call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7)).
call_with_args(M:A,A1,A2,A3,A4,A5,A6,A7) :- !,
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,M).
call_with_args(A,A1,A2,A3,A4,A5,A6,A7) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,M).
call_with_args(A,A1,A2,A3,A4,A5,A6,A7) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6,A7)).
call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8)).
call_with_args(M:A,A1,A2,A3,A4,A5,A6,A7,A8) :- !,
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,M).
call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,M).
call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8)).
call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8,A9) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8,A9)).
call_with_args(M:A,A1,A2,A3,A4,A5,A6,A7,A8,A9) :- !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,M).
call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,M).
call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9)).
call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :- var(V), !,
'$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10)).
call_with_args(M:A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :- !,
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,M).
call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :- atom(A), !,
'$current_module'(M),
'$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,M).
call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :-
'$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10)).
op(P,T,V) :- var(P), !,
'$do_error'(instantiation_error,op(P,T,V)).
op(P,T,V) :- \+integer(P), !,
'$do_error'(type_error(integer,P),op(P,T,V)).
op(P,T,V) :- (P < 0 ; P > 1200), !,
'$do_error'(domain_error(operator_priority,P),op(P,T,V)).
op(P,T,V) :- var(T), !,
'$do_error'(instantiation_error,op(P,T,V)).
op(P,T,V) :- \+atom(T), !,
'$do_error'(type_error(atom,T),op(P,T,V)).
op(P,T,V) :- var(V), !,
'$do_error'(instantiation_error,op(P,T,V)).
op(P,T,V) :-
\+ atom(V), \+ '$check_list_of_operators'(V, op(P,T,V)),
'$do_error'(type_error(list,V),op(P,T,V)).
op(P,T,V) :- '$op2'(P,T,V).
'$check_list_of_operators'(V, T) :- var(V), !,
'$do_error'(instantiation_error,T).
'$check_list_of_operators'([], _).
'$check_list_of_operators'([H|L], T) :-
'$check_if_operator'(H,T),
'$check_list_of_operators'(L, T).
'$check_if_operator'(H,T) :- var(H), !,
'$do_error'(instantiation_error,T).
'$check_if_operator'(H,_) :- atom(H), !.
'$check_if_operator'(H,T) :-
'$do_error'(type_error(atom,H),T).
'$op2'(_,_,[]) :- !.
'$op2'(P,T,[A|L]) :- !, '$op'(P,T,A), '$op2'(P,T,L).
'$op2'(P,T,A) :- atom(A), '$op'(P,T,A).
'$op'(P,T,',') :- !,
'$do_error'(permission_error(modify,operator,','),op(P,T,',')).
'$op'(P,T,A) :- '$opdec'(P,T,A).
%%% Operating System utilities
cd(A) :- atom(A), !, atom_codes(A,S), '$cd'(S).
cd(S) :- '$cd'(S).
getcwd(D) :- '$getcwd'(SD), atom_codes(D, SD).
system(A) :- atom(A), !, atom_codes(A,S), '$system'(S).
system(S) :- '$system'(S).
rename(Old,New) :- atom(Old), atom(New), !,
name(Old,SOld), name(New,SNew),
'$rename'(SOld,SNew).
unix(V) :- var(V), !,
'$do_error'(instantiation_error,unix(V)).
unix(argv(L)) :- '$is_list_of_atoms'(L,L), !, '$argv'(L).
unix(argv(V)) :-
'$do_error'(type_error(atomic,V),unix(argv(V))).
unix(cd) :- cd('~').
unix(cd(V)) :- var(V), !,
'$do_error'(instantiation_error,unix(cd(V))).
unix(cd(A)) :- atomic(A), !, cd(A).
unix(cd(V)) :-
'$do_error'(type_error(atomic,V),unix(cd(V))).
unix(environ(X,Y)) :- '$do_environ'(X,Y).
unix(getcwd(X)) :- getcwd(X).
unix(shell(V)) :- var(V), !,
'$do_error'(instantiation_error,unix(shell(V))).
unix(shell(A)) :- atomic(A), !, '$shell'(A).
unix(shell(V)) :-
'$do_error'(type_error(atomic,V),unix(shell(V))).
unix(system(V)) :- var(V), !,
'$do_error'(instantiation_error,unix(system(V))).
unix(system(A)) :- atomic(A), !, system(A).
unix(system(V)) :-
'$do_error'(type_error(atom,V),unix(system(V))).
unix(shell) :- sh.
unix(putenv(X,Y)) :- '$putenv'(X,Y).
'$is_list_of_atoms'(V,_) :- var(V),!.
'$is_list_of_atoms'([],_) :- !.
'$is_list_of_atoms'([H|L],L0) :- !,
'$check_if_head_may_be_atom'(H,L0),
'$is_list_of_atoms'(L,L0).
'$is_list_of_atoms'(H,L0) :-
'$do_error'(type_error(list,H),unix(argv(L0))).
'$check_if_head_may_be_atom'(H,L0) :-
var(H), !.
'$check_if_head_may_be_atom'(H,L0) :-
atom(H), !.
'$check_if_head_may_be_atom'(H,L0) :-
'$do_error'(type_error(atom,H),unix(argv(L0))).
'$do_environ'(X, Y) :-
var(X), !,
'$do_error'(instantiation_error,unix(environ(X,Y))).
'$do_environ'(X, Y) :- atom(X), !,
'$getenv'(X,Y).
'$do_environ'(X, Y) :-
'$do_error'(type_error(atom,X),unix(environ(X,Y))).
putenv(Na,Val) :-
'$putenv'(Na,Val).
getenv(Na,Val) :-
'$getenv'(Na,Val).
alarm(_, _, _) :-
recorded('$alarm_handler',_, Ref), erase(Ref), fail.
alarm(Interval, Goal, Left) :-
'$current_module'(M),
'$recordz'('$alarm_handler',M:Goal,_),
'$alarm'(Interval, Left).
on_signal(Signal,OldAction,default) :-
recorded('$sig_handler', default(Signal,Action), _Ref),
on_signal(Signal,OldAction,Action).
on_signal(Signal,OldAction,Action) :-
recorded('$sig_handler', action(Signal,OldAction), Ref),
erase(Ref),
'$current_module'(M),
'$recordz'('$sig_handler', action(Signal,M:Action), _).
%%% Saving and restoring a computation
save(A) :- var(A), !,
'$do_error'(instantiation_error,save(A)).
save(A) :- atom(A), !, name(A,S), '$save'(S).
save(S) :- '$save'(S).
save(A,_) :- var(A), !,
'$do_error'(instantiation_error,save(A)).
save(A,OUT) :- atom(A), !, name(A,S), '$save'(S,OUT).
save(S,OUT) :- '$save'(S,OUT).
save_program(A) :- var(A), !,
'$do_error'(instantiation_error,save_program(A)).
save_program(A) :- atom(A), !, name(A,S), '$save_program'(S).
save_program(S) :- '$save_program'(S).
save_program(A, G) :- var(A), !,
'$do_error'(instantiation_error,save_program(A,G)).
save_program(A, G) :- var(G), !,
'$do_error'(instantiation_error,save_program(A,G)).
save_program(A, G) :- \+ callable(G), !,
'$do_error'(type_error(callable,G),save_program(A,G)).
save_program(A, G) :-
( atom(A) -> name(A,S) ; A = S),
'$recorda'('$restore_goal',G,R),
'$save_program'(S),
erase(R),
fail.
save_program(_,_).
restore(A) :- var(A), !,
'$do_error'(instantiation_error,restore(A)).
restore(A) :- atom(A), !, name(A,S), '$restore'(S).
restore(S) :- '$restore'(S).
%%% Data base predicates -> the interface to the external world
recorda(Key,Term,Ref) :- '$recorda'(Key,Term,Ref).
recordz(Key,Term,Ref) :- '$recordz'(Key,Term,Ref).
recordaifnot(Key,Term,Ref) :- '$recordaifnot'(Key,Term,Ref).
recordzifnot(Key,Term,Ref) :- '$recordzifnot'(Key,Term,Ref).
%%% Atoms with value
get_value(X,Y) :- '$get_value'(X,Y).
set_value(X,Y) :- '$set_value'(X,Y).
%%% current ....
current_atom(A) :- % check
atom(A), !.
current_atom(A) :- % generate
'$current_atom'(A).
current_predicate(A,T) :- var(T), !, % only for the predicate
'$current_module'(M),
'$current_predicate_no_modules'(M,A,T).
current_predicate(A,M:T) :- % module specified
var(M), !,
current_module(M),
M \= prolog,
'$current_predicate_no_modules'(M,A,T).
current_predicate(A,M:T) :- % module specified
nonvar(T),
!,
functor(T,A,_),
'$pred_exists'(T,M).
current_predicate(A,M:T) :- % module specified
!,
'$current_predicate_no_modules'(M,A,T).
current_predicate(A,T) :- % only for the predicate
'$current_module'(M),
'$current_predicate_no_modules'(M,A,T).
current_predicate(F) :- var(F), !, % only for the predicate
'$current_module'(M),
'$current_predicate3'(M,F).
current_predicate(M:F) :- % module specified
var(M), !,
'$current_module'(M),
M \= prolog,
'$current_predicate3'(M,F).
current_predicate(M:F) :- % module specified
!,
'$current_predicate3'(M,F).
current_predicate(S) :- % only for the predicate
'$current_module'(M),
'$current_predicate3'(M,S).
system_predicate(A,P) :-
'$current_predicate_no_modules'(prolog,A,P),
\+ '$hidden'(A).
system_predicate(P) :-
'$current_module'(M),
'$system_predicate'(P,M).
'$current_predicate_no_modules'(M,A,T) :-
'$current_predicate'(M,A,Arity),
functor(T,A,Arity),
'$pred_exists'(T,M).
'$current_predicate3'(M,A/Arity) :- !,
'$current_predicate'(M,A,Arity),
functor(T,A,Arity),
'$pred_exists'(T,M).
'$current_predicate3'(M,BadSpec) :- % only for the predicate
'$do_error'(type_error(predicate_indicator,BadSpec),current_predicate(M:BadSpec)).
%%% User interface for statistics
statistics :-
'$runtime'(Runtime,_),
'$cputime'(CPUtime,_),
'$walltime'(Walltime,_),
'$statistics_heap_info'(HpSpa, HpInUse),
'$statistics_heap_max'(HpMax),
'$statistics_trail_info'(TrlSpa, TrlInUse),
'$statistics_trail_max'(TrlMax),
'$statistics_stacks_info'(StkSpa, GlobInU, LocInU),
'$statistics_global_max'(GlobMax),
'$statistics_local_max'(LocMax),
'$inform_heap_overflows'(NOfHO,TotHOTime),
'$inform_stack_overflows'(NOfSO,TotSOTime),
'$inform_trail_overflows'(NOfTO,TotTOTime),
'$inform_gc'(NOfGC,TotGCTime,TotGCSize),
'$inform_agc'(NOfAGC,TotAGCTime,TotAGCSize),
'$statistics'(Runtime,CPUtime,Walltime,HpSpa,HpInUse,HpMax,TrlSpa, TrlInUse,TrlMax,StkSpa, GlobInU, LocInU,GlobMax,LocMax,NOfHO,TotHOTime,NOfSO,TotSOTime,NOfTO,TotTOTime,NOfGC,TotGCTime,TotGCSize,NOfAGC,TotAGCTime,TotAGCSize).
'$statistics'(Runtime,CPUtime,Walltime,HpSpa,HpInUse,HpMax,TrlSpa, TrlInUse,_TrlMax,StkSpa, GlobInU, LocInU,GlobMax,LocMax,NOfHO,TotHOTime,NOfSO,TotSOTime,NOfTO,TotTOTime,NOfGC,TotGCTime,TotGCSize,NOfAGC,TotAGCTime,TotAGCSize) :-
TotalMemory is HpSpa+StkSpa+TrlSpa,
'$format'(user_error,"memory (total)~t~d bytes~35+~n", [TotalMemory]),
'$format'(user_error," program space~t~d bytes~35+", [HpSpa]),
'$format'(user_error,":~t ~d in use~19+", [HpInUse]),
HpFree is HpSpa-HpInUse,
'$format'(user_error,",~t ~d free~19+~n", [HpFree]),
'$format'(user_error,"~t ~d max~73+~n", [HpMax]),
'$format'(user_error," stack space~t~d bytes~35+", [StkSpa]),
StackInUse is GlobInU+LocInU,
'$format'(user_error,":~t ~d in use~19+", [StackInUse]),
StackFree is StkSpa-StackInUse,
'$format'(user_error,",~t ~d free~19+~n", [StackFree]),
'$format'(user_error," global stack:~t~35+", []),
'$format'(user_error," ~t ~d in use~19+", [GlobInU]),
'$format'(user_error,",~t ~d max~19+~n", [GlobMax]),
'$format'(user_error," local stack:~t~35+", []),
'$format'(user_error," ~t ~d in use~19+", [LocInU]),
'$format'(user_error,",~t ~d max~19+~n", [LocMax]),
'$format'(user_error," trail stack~t~d bytes~35+", [TrlSpa]),
'$format'(user_error,":~t ~d in use~19+", [TrlInUse]),
TrlFree is TrlSpa-TrlInUse,
'$format'(user_error,",~t ~d free~19+~n", [TrlFree]),
OvfTime is (TotHOTime+TotSOTime+TotTOTime)/1000,
'$format'(user_error,"~n~t~3f~12+ sec. for ~w code, ~w stack, and ~w trail space overflows~n",
[OvfTime,NOfHO,NOfSO,NOfTO]),
TotGCTimeF is float(TotGCTime)/1000,
'$format'(user_error,"~t~3f~12+ sec. for ~w garbage collections which collected ~d bytes~n",
[TotGCTimeF,NOfGC,TotGCSize]),
TotAGCTimeF is float(TotAGCTime)/1000,
'$format'(user_error,"~t~3f~12+ sec. for ~w atom garbage collections which collected ~d bytes~n",
[TotAGCTimeF,NOfAGC,TotAGCSize]),
RTime is float(Runtime)/1000,
'$format'(user_error,"~t~3f~12+ sec. runtime~n", [RTime]),
CPUTime is float(CPUtime)/1000,
'$format'(user_error,"~t~3f~12+ sec. cputime~n", [CPUTime]),
WallTime is float(Walltime)/1000,
'$format'(user_error,"~t~3f~12+ sec. elapsed time~n~n", [WallTime]),
fail.
'$statistics'(_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_).
statistics(runtime,[T,L]) :-
'$runtime'(T,L).
statistics(cputime,[T,L]) :-
'$cputime'(T,L).
statistics(walltime,[T,L]) :-
'$walltime'(T,L).
%statistics(core,[_]).
%statistics(memory,[_]).
statistics(heap,[Hp,HpF]) :-
'$statistics_heap_info'(HpM, Hp),
HpF is HpM-Hp.
statistics(program,Info) :-
statistics(heap,Info).
statistics(global_stack,[GlobInU,GlobFree]) :-
'$statistics_stacks_info'(StkSpa, GlobInU, LocInU),
GlobFree is StkSpa-GlobInU-LocInU.
statistics(local_stack,[LocInU,LocFree]) :-
'$statistics_stacks_info'(StkSpa, GlobInU, LocInU),
LocFree is StkSpa-GlobInU-LocInU.
statistics(trail,[TrlInUse,TrlFree]) :-
'$statistics_trail_info'(TrlSpa, TrlInUse),
TrlFree is TrlSpa-TrlInUse.
statistics(garbage_collection,[NOfGC,TotGCSize,TotGCTime]) :-
'$inform_gc'(NOfGC,TotGCTime,TotGCSize).
statistics(stack_shifts,[NOfHO,NOfSO,NOfTO]) :-
'$inform_heap_overflows'(NOfHO,_),
'$inform_stack_overflows'(NOfSO,_),
'$inform_trail_overflows'(NOfTO,_).
%%% The unknown predicate,
% informs about what the user wants to be done when
% there are no clauses for a certain predicate */
unknown(V0,V) :-
'$current_module'(M),
'$unknown'(V0,V,M).
% query mode
'$unknown'(V0,V,_) :- var(V), !,
'$ask_unknown_flag'(V),
V = V0.
% handle modules.
'$unknown'(V0,Mod:Handler,_) :-
'$unknown'(V0,Handler,Mod).
% check if we have one we like.
'$unknown'(_,New,Mod) :-
'$valid_unknown_handler'(New,Mod), fail.
% clean up previous unknown predicate handlers
'$unknown'(Old,New,Mod) :-
'$recorded'('$unknown','$unknown'(_,MyOld),Ref), !,
erase(Ref),
'$cleanup_unknown_handler'(MyOld,Old),
'$new_unknown'(New, Mod).
% store the new one.
'$unknown'(fail,New,Mod) :-
'$new_unknown'(New, Mod).
'$valid_unknown_handler'(V,_) :-
var(V), !,
'$do_error'(instantiation_error,yap_flag(unknown,V)).
'$valid_unknown_handler'(fail,_) :- !.
'$valid_unknown_handler'(error,_) :- !.
'$valid_unknown_handler'(warning,_) :- !.
'$valid_unknown_handler'(S,M) :-
functor(S,_,1),
arg(1,S,A),
var(A),
\+ '$undefined'(S,M),
!.
'$valid_unknown_handler'(S,_) :-
'$do_error'(domain_error(flag_value,unknown+S),yap_flag(unknown,S)).
'$ask_unknown_flag'(Old) :-
'$recorded'('$unknown','$unkonwn'(_,MyOld),_), !,
'$cleanup_unknwon_handler'(MyOld,Old).
'$ask_unknown_flag'(fail).
'$cleanup_unknown_handler'('$unknown_error'(_),error) :- !.
'$cleanup_unknown_handler'('$unknown_warning'(_),warning) :- !.
'$cleanup_unknown_handler'(Handler, Handler).
'$new_unknown'(fail,_) :- !.
'$new_unknown'(error,_) :- !,
'$recorda'('$unknown','$unknown'(P,'$unknown_error'(P)),_).
'$new_unknown'(warning,_) :- !,
'$recorda'('$unknown','$unknown'(P,'$unknown_warning'(P)),_).
'$new_unknown'(X,M) :-
arg(1,X,A),
'$recorda'('$unknown','$unknown'(A,M:X),_).
'$unknown_error'(P) :-
'$do_error'(unknown,P).
'$unknown_warning'(P) :-
P=M:F,
functor(F,Na,Ar),
'$format'(user_error,"[ EXISTENCE ERROR: ~w, procedure ~w:~w/~w undefined ]~n",
[P,M,Na,Ar]),
fail.
%%% Some "dirty" predicates
% Only efective if yap compiled with -DDEBUG
% this predicate shows the code produced by the compiler
'$show_code' :- '$debug'(0'f).
grow_heap(X) :- '$grow_heap'(X).
grow_stack(X) :- '$grow_stack'(X).
%
% gc() expects to be called from "call". Make sure it has an
% environment to return to.
%
%garbage_collect :- save(dump), '$gc', save(dump2).
garbage_collect :-
'$gc'.
gc :-
yap_flag(gc,on).
nogc :-
yap_flag(gc,off).
garbage_collect_atoms :-
'$atom_gc'.
'$force_environment_for_gc'.
'$good_list_of_character_codes'(V) :- var(V), !.
'$good_list_of_character_codes'([]).
'$good_list_of_character_codes'([X|L]) :-
'$good_character_code'(X),
'$good_list_of_character_codes'(L).
'$good_character_code'(X) :- var(X), !.
'$good_character_code'(X) :- integer(X), X > -2, X < 256.
atom_concat(X,Y,At) :-
atom(At), !,
atom_length(At,Len),
'$atom_contact_split'(At,0,Len,X,Y).
/* Let atom_chars do our error handling */
atom_concat(X,Y,At) :-
atom_codes(X,S1),
atom_codes(Y,S2),
'$append'(S1,S2,S),
atom_codes(At,S).
'$atom_contact_split'(At,Len,Len,X,Y) :- !,
'$atom_split'(At,Len,X,Y).
'$atom_contact_split'(At,Len1,_,X,Y) :-
'$atom_split'(At,Len1,X,Y).
'$atom_contact_split'(At,Len1,Len,X,Y) :-
Len2 is Len1+1,
'$atom_contact_split'(At,Len2,Len,X,Y).
sub_atom(At, Bef, Size, After, SubAt) :-
var(At), !,
'$do_error'(instantiation_error,sub_atom(At, Bef, Size,After, SubAt)).
sub_atom(At, Bef, Size, After, SubAt) :-
\+ atom(At), !,
'$do_error'(type_error(atom,At),sub_atom(At, Bef, Size,After, SubAt)).
sub_atom(At, Bef, Size, After, SubAt) :-
nonvar(SubAt), \+ atom(SubAt), !,
'$do_error'(type_error(atom,SubAt),sub_atom(At, Bef, Size,After, SubAt)).
sub_atom(At, Bef, Size, After, SubAt) :-
'$check_type_sub_atom'(Bef, sub_atom(At, Bef, Size,After, SubAt)),
'$check_type_sub_atom'(Size, sub_atom(At, Bef, Size,After, SubAt)),
'$check_type_sub_atom'(After, sub_atom(At, Bef, Size,After, SubAt)),
atom_codes(At, Atl),
'$$_length1'(Atl,0,Len),
'$split_len_in_parts'(Atl, Len, Bef, Size, After, SubAtl),
atom_codes(SubAt, SubAtl).
'$check_type_sub_atom'(I, _) :-
var(I), !.
'$check_type_sub_atom'(I, P) :-
integer(I), I < 0, !,
'$do_error'(domain_error(not_less_than_zero,I),P).
'$check_type_sub_atom'(I, P) :-
\+ integer(I), !,
'$do_error'(type_error(integer,I),P).
'$check_type_sub_atom'(_, _).
'$split_len_in_parts'(Atl, Len, Bef, Size, After, SubAt) :-
var(Bef), !,
'$range_var'(0, Len, Bef),
'$split_len_in_parts2'(Atl, Len, Bef, Size, After, SubAt).
'$split_len_in_parts'(Atl, Len, Bef, Size, After, SubAt) :-
'$split_len_in_parts2'(Atl, Len, Bef, Size, After, SubAt).
'$split_len_in_parts2'(Atl, Len, 0, Size, After, SubAt) :- !,
'$split_len_in_parts3'(Atl, Len, Size, After, SubAt).
'$split_len_in_parts2'([_|Atl], Len0, Bef0, Size, After, SubAt) :-
Bef is Bef0-1 ,
Len is Len0-1,
'$split_len_in_parts2'(Atl, Len, Bef, Size, After, SubAt).
'$split_len_in_parts3'(Atl, Len, Size, After, SubAt) :-
var(Size), !,
'$range_var'(0, Len, Size),
'$split_len_in_parts4'(Atl, Len, Size, After, SubAt).
'$split_len_in_parts3'(Atl, Len, Size, After, SubAt) :-
'$split_len_in_parts4'(Atl, Len, Size, After, SubAt).
'$split_len_in_parts4'(_, Len, 0, After, SubAt) :- !,
After = Len,
SubAt = [].
'$split_len_in_parts4'([Code|Atl], Len0, Size0, After, [Code|SubAt]) :-
Size is Size0-1,
Len is Len0-1,
'$split_len_in_parts4'(Atl, Len, Size, After, SubAt).
'$range_var'(X,X,S) :- !, S = X.
'$range_var'(X1,_,X1).
'$range_var'(X1,X2,XF) :-
X11 is X1+1,
'$range_var'(X11,X2,XF).
'$singletons_in_term'(T,VL) :-
'$variables_in_term'(T,[],V10),
'$sort'(V10, V1),
'$non_singletons_in_term'(T,[],V20),
'$sort'(V20, V2),
'$subtract_lists_of_variables'(V2,V1,VL).
'$subtract_lists_of_variables'([],VL,VL).
'$subtract_lists_of_variables'([_|_],[],[]) :- !.
'$subtract_lists_of_variables'([V1|VL1],[V2|VL2],VL) :-
V1 == V2, !,
'$subtract_lists_of_variables'(VL1,VL2,VL).
'$subtract_lists_of_variables'([V1|VL1],[V2|VL2],[V2|VL]) :-
'$subtract_lists_of_variables'([V1|VL1],VL2,VL).
simple(V) :- var(V), !.
simple(A) :- atom(A), !.
simple(N) :- number(N).
callable(V) :- var(V), !, fail.
callable(V) :- atom(V), !.
callable(V) :- functor(V,_,Ar), Ar > 0.
initialization :-
'$initialisation_goals'.
prolog_initialization(G) :- var(G), !,
'$do_error'(instantiation_error,initialization(G)).
prolog_initialization(T) :- callable(T), !,
'$assert_init'(T).
prolog_initialization(T) :-
'$do_error'(type_error(callable,T),initialization(T)).
'$assert_init'(T) :- '$recordz'('$startup_goal',T,_), fail.
'$assert_init'(_).
version :- '$version'.
version(V) :- var(V), !,
'$do_error'(instantiation_error,version(V)).
version(T) :- atom(T), !, '$assert_version'(T).
version(T) :-
'$do_error'(type_error(atom,T),version(T)).
'$assert_version'(T) :- '$recordz'('$version',T,_), fail.
'$assert_version'(_).
term_variables(Term, L) :-
'$variables_in_term'(Term, [], L).
term_hash(X,Y) :-
term_hash(X,-1,16'1000000,Y).
%
% allow users to define their own directives.
%
user_defined_directive(Dir,_) :-
'$directive'(Dir), !.
user_defined_directive(Dir,Action) :-
functor(Dir,Na,Ar),
functor(NDir,Na,Ar),
'$current_module'(M, prolog),
assert_static('$directive'(NDir)),
assert_static(('$exec_directive'(Dir, _, _) :- Action)),
'$current_module'(_, M).
'$set_toplevel_hook'(_) :-
'$recorded'('$toplevel_hooks',_,R),
erase(R),
fail.
'$set_toplevel_hook'(H) :-
'$recorda'('$toplevel_hooks',H,_),
fail.
'$set_toplevel_hook'(_).
raise_exception(Ball) :- throw(Ball).
on_exception(Pat, G, H) :- catch(G, Pat, H).
'$append'([], L, L) .
'$append'([H|T], L, [H|R]) :-
'$append'(T, L, R).
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