/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: debug.pl *
* Last rev: *
* mods: *
* comments: YAP's debugger *
* *
*************************************************************************/
/*-----------------------------------------------------------------------------
Debugging / creating spy points
-----------------------------------------------------------------------------*/
:- op(900,fx,[spy,nospy]).
% First part : setting and reseting spy points
% $suspy does most of the work
'$suspy'(V,S,M) :- var(V) , !,
throw(error(instantiation_error,M:spy(V,S))).
'$suspy'((M:S),P,_) :- !,
'$suspy'(S,P,M).
'$suspy'([],_,_) :- !.
'$suspy'([F|L],S,M) :- !, ( '$suspy'(F,S,M) ; '$suspy'(L,S,M) ).
'$suspy'(F/N,S,M) :- !, functor(T,F,N),
( '$system_predicate'(T) ->
throw(error(permission_error(access,private_procedure,F/N),spy(F/N,S)));
'$undefined'(T,M) ->
throw(error(existence_error(procedure,F/N),spy(F/N,S)));
'$suspy2'(S,F,N,T,M) ).
'$suspy'(A,S,_) :- \+ atom(A) , !,
throw(error(type_error(predicate_indicator,A),spy(A,S))).
'$suspy'(A,spy,M) :- '$noclausesfor'(A,M), !,
throw(error(existence_error(procedure,A),spy(A))).
'$suspy'(A,nospy,M) :- '$noclausesfor'(A,M), !,
throw(error(existence_error(procedure,A),nospy(A))).
'$suspy'(A,S,M) :- current_predicate(A,M:T),
\+ '$undefined'(T,M), \+ '$system_predicate'(T),
functor(T,F,N),
'$suspy2'(S,F,N,T,M).
'$noclausesfor'(A,M) :- current_predicate(A,M:T),
\+ '$undefined'(T,M) , \+ '$system_predicate'(T) ,
!, fail .
'$noclausesfor'(_,_).
'$suspy2'(spy,F,N,T,M) :-
'$recorded'('$spy','$spy'(T,M),_), !,
'$format'(user_error, "[ Warning: there is already a spy point on ~w:~w/~w ]~n",[M,F,N]).
'$suspy2'(spy,F,N,T,M) :- !,
'$warn_if_undef'(T,F,N,M),
'$recorda'('$spy','$spy'(T,M),_),
'$set_value'('$spypoint_added', true),
'$set_spy'(T,M),
'$format'(user_error,"[ Spy point set on ~w:~w/~w ]~n", [M,F,N]).
'$suspy2'(nospy,F,N,T,M) :-
'$recorded'('$spy','$spy'(T,M),R), !,
erase(R),
'$rm_spy'(T,M),
'$format'(user_error,"[ Spy point on ~w:~w/~w removed ]~n", [M,F,N]).
'$suspy2'(nospy,F,N,_,M) :-
'$format'(user_error,"[ Warning: there is no spy point on ~w:~w/~w ]~n", [M,F,N]).
'$warn_if_undef'(T,F,N,M) :- '$undefined'(T,M), !,
write(user_error,'[ Warning: you have no clauses for '),
write(user_error,M:F/N), write(user_error,' ]'), nl(user_error).
'$warn_if_undef'(_,_,_,_).
'$pred_being_spied'(G, M) :-
'$recorded'('$spy','$spy'(G,M),_), !.
spy _ :- '$set_value'('$spypoint_added', false), fail.
spy L :-
'$current_module'(M),
'$suspy'(L, spy, M), fail.
spy _ :- '$get_value'('$spypoint_added', false), !.
spy _ :- debug.
nospy L :-
'$current_module'(M),
'$suspy'(L, nospy, M), fail.
nospy _.
nospyall :-
'$recorded'('$spy','$spy'(T,M),_), functor(T,F,N), '$suspy'(F/N,nospy,M), fail.
nospyall.
% debug mode -> debug flag = 1
debug :- '$get_value'(debug,1), !.
debug :- '$set_value'(debug,1), write(user_error,'[ Debug mode on ]'), nl(user_error).
nodebug :- nospyall,
'$set_value'(debug,0),
'$set_value'('$trace',0),
'$format'(user_error,"[ Debug mode off ]~n",[]).
trace :- '$get_value'('$trace',1), !.
trace :-
'$format'(user_error,"[ Trace mode on ]~n",[]),
'$set_value'('$trace',1),
'$set_value'(debug,1),
'$set_value'(spy_sl,0),
% start creep,
'$set_yap_flags'(10,1),
'$creep'.
notrace :-
'$set_value'('$trace',0),
'$set_value'(debug,0),
'$format'(user_error,"[ Trace and Debug mode off ]",[]).
/*-----------------------------------------------------------------------------
leash
-----------------------------------------------------------------------------*/
leash(X) :- var(X),
throw(error(instantiation_error,leash(X))).
leash(X) :- '$leashcode'(X,Code),
'$set_value'('$leash',Code),
'$show_leash'(Code), !.
leash(X) :-
throw(error(type_error(leash_mode,X),leash(X))).
'$show_leash'(0) :- write(user_error,'[ No leashing ]'), nl(user_error).
'$show_leash'(L) :-
'$leashcode'(Code,L),
write(user_error,'[ Leashing set to '), write(user_error,Code),
write(user_error,' ('),
'$show_leash_bit'(WasWritten,2'1000,L,call),
'$show_leash_bit'(WasWritten,2'0100,L,exit),
'$show_leash_bit'(WasWritten,2'0010,L,redo),
'$show_leash_bit'(WasWritten,2'0001,L,fail),
write(user_error,') ]'), nl(user_error).
'$show_leash_bit'(_,Bit,Code,_) :- Bit /\ Code =:= 0, !.
'$show_leash_bit'(Was,_,_,Name) :- var(Was), !,
Was = yes, write(user_error,Name).
'$show_leash_bit'(_,_,_,Name) :-
write(user_error,','), write(user_error,Name).
'$leashcode'(full,2'1111) :- !.
'$leashcode'(on,2'1111) :- !.
'$leashcode'(half,2'1010) :- !.
'$leashcode'(loose,2'1000) :- !.
'$leashcode'(off,2'0000) :- !.
%'$leashcode'([L|M],Code) :- !, '$leashcode_list'([L|M],Code).
'$leashcode'([L|M],Code) :- !, ( var(Code) -> '$list2Code'([L|M],Code)
; '$code2List'(Code,[L|M]) ).
'$leashcode'(N,N) :- integer(N), N >= 0, N =< 2'1111.
'$list2Code'(V,_) :- var(V), !,
throw(error(instantiation_error,leash(V))).
'$list2Code'([],0) :- !.
'$list2Code'([V|L],_) :- var(V), !,
throw(error(instantiation_error,leash([V|L]))).
'$list2Code'([call|L],N) :- '$list2Code'(L,N1), N is 2'1000 + N1.
'$list2Code'([exit|L],N) :- '$list2Code'(L,N1), N is 2'0100 + N1.
'$list2Code'([redo|L],N) :- '$list2Code'(L,N1), N is 2'0010 + N1.
'$list2Code'([fail|L],N) :- '$list2Code'(L,N1), N is 2'0001 + N1.
'$code2List'(0,[]) :- !.
'$code2List'(N,[call|L]) :- X is N /\ 2'1000, X \= 0, !,
M is N-X, '$code2List'(M,L).
'$code2List'(N,[exit|L]) :- X is N /\ 2'0100, X \= 0, !,
M is N-X, '$code2List'(M,L).
'$code2List'(N,[redo|L]) :- X is N /\ 2'0010, X \= 0, !,
M is N-X, '$code2List'(M,L).
'$code2List'(N,[fail|L]) :- X is N /\ 2'0001, X \= 0, !,
M is N-X, '$code2List'(M,L).
/*-----------------------------------------------------------------------------
debugging
-----------------------------------------------------------------------------*/
debugging :-
'$get_value'(debug,1) ->
write(user_error,'[ Debug mode is switched on ]') ,
nl(user_error),
'$debugging_mode'
;
write(user_error,'[ Debug mode is switched off ]') ,
nl(user_error)
.
'$debugging_mode' :-
( '$recorded'('$spy',_,_) -> '$show_spies' ;
write(user_error,'[ Warning: there are no spy-points set ]') ,
nl(user_error) ),
'$get_value'('$leash',Leash),
'$show_leash'(Leash).
'$show_spies' :-
write(user_error,'[ Spy points set on :'), nl(user_error),
( '$recorded'('$spy','$spy'(T,M),_), functor(T,F,N),
write(user_error,' '),write(user_error,M:F/N),nl(user_error),
fail ;
write(user_error,' ]'), nl(user_error) ).
/*-----------------------------------------------------------------------------
spy
-----------------------------------------------------------------------------*/
% This is executed before from the abstract
% machine when the spy_flag is on
% these flags are used
% flag description initial/possible values
% spy_gn goal number 1 1...
% spy_creep creep 0 0, 1
% spy_sl skip level 0 0...
% spy_sp skip port 0 0, call, fail, redo, exit
% spy_leap leap 0 0...
% spy_cl clause number 1 1...
% spy_fs fast skip 0 0, 1
% spy_trace trace 0 0, 1
% a flip-flop is also used
% when 1 spying is enabled
%'$spy'(G) :- write(user_error,'$spy'(G)), nl, fail.
%
% handle suspended goals
% take care with hidden goals.
%
% $spy may be called from user code, so be careful.
'$spy'(G) :-
'$awoken_goals'(LG), !,
'$creep',
'$wake_up_goal'(G, LG).
'$spy'([_|Mod:G]) :- !,
'$spy'([Mod|G]).
'$spy'([Module|G]) :-
% '$format'(user_error,"$spym(~w,~w)~n",[Module,G]),
( '$hidden'(G)
;
'$parent_pred'(0,_,_),
'$system_predicate'(G)
),
!,
/* called from prolog module */
'$execute0'(G,Module),
'$creep'.
'$spy'([Mod|G]) :-
'$do_spy'(G,Mod).
'$direct_spy'(G) :-
'$awoken_goals'(LG), !,
'$creep',
'$wake_up_goal'(G, LG).
'$direct_spy'([M|G]) :-
'$hidden'(G),
!,
/* called from prolog module */
'$execute0'(G,M),
'$creep'.
'$direct_spy'([Mod|G]) :-
'$do_spy'(G, Mod).
'$do_spy'(true, _) :- !, '$creep'.
'$do_spy'('$cut_by'(M), _) :- !, '$cut_by'(M).
'$do_spy'(G, Module) :-
% write(user_error,$spy(G)), nl,
'$get_value'(debug,1), /* ditto if debug off */
'$get_value'(spy_fs,0), /* ditto if fast skipping */
( '$access_yap_flags'(10,0) -> /* if not creeping ... */
'$pred_being_spied'(G,M) /* ... spy only if at a spy-point */
; true
),
% ( \+ '$undefined'(user_error_spy(_), user) -> user_error_spy(G) ;
% true );
!, /* you sure want to spy this ... */
'$get_value'(spy_gn,L), /* get goal no. */
L1 is L+1, /* bump it */
'$set_value'(spy_gn,L1), /* and save it globaly */
'$access_yap_flags'(10,SC),
'$set_yap_flags'(10,1), /* set creep on */
'$get_value'(spy_cl,CL), /* save global clause no. */
repeat, /* we need this to be able to implement retry */
'$init_spy_cl'(G,Module),
'$trace'(call,G,Module,L), /* inform about call port */
/* the following choice point is where the predicate is called */
( '$get_value'(spy_sp,0), /* make sure we are not skipping*/
'$spycalls'(G,Module,Res) /* go execute the predicate */
; /* we get here when the predicate fails */
'$trace'(fail,G,Module,L), /* inform at fail port */
'$get_value'(spy_sl,L2),/* make sure we are not ... */
L2 \= L, /* ... skiping to this level */
!, /* if not prepare to exit spy */
'$set_value'(spy_cl,CL),/* restore global value of clause no */
'$setflop'(0),
'$set_creep'(SC), /* restore creep value */
'$cont_creep', fail ), /* and exit */
'$get_value'(spy_cl,Cla), /* save no. of clause to try */
( var(Res), /* check not redoing */
'$trace'(exit,G,Module,L), /* output message at exit */
'$get_value'(spy_sp,0), /* check not skipping */
'$set_creep'(SC), /* restore creep value */
'$set_value'(spy_cl,CL), /* restore clause no. */
'$setflop'(0),
'$cont_creep'; /* exit */
/* we get here when we want to redo a goal */
'$set_value'(spy_cl,Cla),/* restore clause no. to try */
'$trace'(redo,G,Module,L), /* inform user_error */
fail /* to backtrack to spycalls */
).
'$do_spy'(G,Mod) :-
'$execute0'(G,Mod). /* this clause applies when we do not want
to spy the goal */
'$cont_creep' :- '$get_value'('$trace',1), '$set_yap_flags'(10,1), fail.
'$cont_creep' :- '$access_yap_flags'(10,1), !, '$creep'.
'$cont_creep'.
'$set_creep'(0) :- !, '$set_yap_flags'(10,0).
'$set_creep'(_).
%'$spycalls'(G,_) :- write(user_error,'$spycalls'(G)), nl(user_error), fail.
'$spycalls'([_|_],_,_) :- !, fail.
'$spycalls'('!'(CP),Mod,_) :-
'$call'(!, CP, !,Mod).
'$spycalls'(Mod:G,_,Res) :-
!,
'$spycalls'(G,Mod,Res).
'$spycalls'(repeat,_,_) :-
!,
repeat.
'$spycalls'(fail,_,_) :-
!,
fail.
'$spycalls'(false,_,_) :-
!,
false.
'$spycalls'(true,_,_) :-
!.
'$spycalls'(otherwise,_,_) :-
!.
'$spycalls'(\+ G,Mod,Res) :-
!,
CP is '$last_choice_pt',
'$spycalls'('$call'((\+ G), CP, (\+ G),Mod),Mod,Res).
'$spycalls'(not(G),Mod,Res) :-
!,
CP is '$last_choice_pt',
'$spycalls'('$call'(not(G), CP, not(G),Mod),Mod,Res).
'$spycalls'(G,M,Res) :- % undefined predicate
'$undefined'(G, M), !,
functor(G,F,N),
( '$recorded'('$import','$import'(S,M,F,N),_) ->
'$spycalls'(G,S,Res) ;
'$undefp'([M|G])
).
'$spycalls'(G,M,_) :-
'$flags'(G,M,F,_), F /\ 8'50000 =\= 0, % Standard and C pred
!,
'$catch_spycall_stdpred'(G,M),
(true;
'$get_value'(spy_sp,P), P \= 0, !, fail),
( true;
'$get_value'(spy_sp,P1), P1 \= 0, !, fail)
.
'$spycalls'(G,M,Res) :- % asserts and retracts can complicate live
( '$get_value'(spy_sp,0) -> true ; !, fail ),
'$flags'(G,M,F,F),
F /\ 16'2000 =\= 0, !, % dynamic procedure, immediate semantics
repeat,
'$db_last_age'(M:G,Max),
'$get_value'(spy_cl,Cl),
'$get_value'(spy_gn,L),
Maxx is Max+1,
'$set_value'(spy_cl,Maxx),
( Cl > Max -> !, fail ; true ),
( '$spycall_dynamic'(G,M,Cl) ;
('$get_value'(spy_gn,L) -> '$leave_creep', fail ;
Res = redo )
),
( true ;
'$get_value'(spy_sp,P), P \= 0, !, fail )
.
'$spycalls'(G,M,Res) :-
( '$get_value'(spy_sp,0) -> true ; !, fail ),
'$flags'(G,M,F,F),
F /\ 16'8 =\= 0, !, % dynamic procedure, logical update semantics
'$hold_index'(M:G, Index, Max), % hold an index on the procedure state when we called this goal
repeat,
'$get_value'(spy_cl,Cl),
'$get_value'(spy_gn,L),
Maxx is Max+1,
'$set_value'(spy_cl,Maxx),
( Cl > Max -> !, fail ; true),
( '$log_upd_spycall'(G,M,Cl,Index) ;
('$get_value'(spy_gn,L) ->
'$leave_creep', fail ; % to backtrack to repeat
Res = redo )
),
( true ;
'$get_value'(spy_sp,P), P \= 0, !, fail
)
.
'$spycalls'(G,M,Res) :-
( '$get_value'(spy_sp,0) -> true ; !, fail ),
repeat,
'$number_of_clauses'(G,M,Max),
'$get_value'(spy_cl,Cl),
'$get_value'(spy_gn,L),
Maxx is Max+1,
'$set_value'(spy_cl,Maxx),
( Cl > Max -> !, fail ; true),
( '$spycall'(G,M,Cl) ;
('$get_value'(spy_gn,L) ->
'$leave_creep', fail ; % to backtrack to repeat
Res = redo )
),
( true ;
'$get_value'(spy_sp,P), P \= 0, !, fail )
.
'$spycall'(G,M,Cl) :-
'$access_yap_flags'(10,0),
!,
'$setflop'(0),
'$call_clause'(G,M,Cl).
'$spycall'(G,M,Cl) :-
'$setflop'(0),
'$creepcallclause'(G,M,Cl).
'$log_upd_spycall'(G,M,Cl,Index) :-
'$access_yap_flags'(10,0),
!,
'$setflop'(0),
'$call_log_updclause'(G,M,Cl,Index).
'$log_upd_spycall'(G,M,Cl,Index) :-
'$setflop'(0),
'$creepcall_log_upd_clause'(G,M,Cl,Index).
% this is to be used only for dynamic predicates
'$spycall_dynamic'(G,M,Cl) :-
'$access_yap_flags'(10,0),
!,
'$setflop'(0),
'$call_dynamic_clause'(G,M,Cl).
'$spycall_dynamic'(G,M,Cl) :-
'$setflop'(0),
'$creepcall_dynamic_clause'(G,M,Cl).
'$catch_spycall_stdpred'(G,M) :-
'$system_catch'('$spycall_stdpred'(G,M), Error, user:'$DebugError'(Error)).
'$spycall_stdpred'(G,M) :-
functor(G,F,N),
(
user:'$meta_predicate'(F,M,N,_) ->
'$setflop'(1),
'$creep',
'$execute0'(G,M)
;
'$setflop'(1),
'$execute0'(G,M)
),
'$setflop'(0).
'$call_clause'(G,M,Cl) :-
'$system_catch'('$do_execute_clause'(G,M,Cl),Error,user:'$DebugError'(Error)).
'$do_execute_clause'(G,M,Cl) :-
'$some_recordedp'(M:G), !,
'$check_depth_for_interpreter'(D),
('$undefined'('$set_depth_limit'(_),prolog) -> true ; '$set_depth_limit'(D)),
CP is '$last_choice_pt',
(
'$fetch_clause'(G,M,Cl,Clause),
(Clause = true -> true ; '$debug_catch_call'(Clause,M,CP) )
;
Next is Cl+1, '$set_value'(spy_cl,Next), fail
).
'$do_execute_clause'(G,M,Cl) :-
'$execute'(G,M,Cl) ; Next is Cl+1, '$set_value'(spy_cl,Next), fail.
'$call_log_updclause'(G,M,Cl,Index) :-
'$system_catch'('$do_execute_log_upd_clause'(G,M,Cl,Index),Error,user:'$DebugError'(Error)).
'$do_execute_log_upd_clause'(G,M,Cl,Index) :-
'$check_depth_for_interpreter'(D),
('$undefined'('$set_depth_limit'(_),prolog) -> true ; '$set_depth_limit'(D)),
CP is '$last_choice_pt',
(
(Index = [] ->
/* We have a single clause */
Cl = 1,
'$clause'(G, M, Clause)
;
Cl1 is Cl-1,
'$fetch_reference_from_index'(Index, Cl1, Ref),
instance(Ref, (G :- Clause))
),
(Clause = true -> true ; '$debug_catch_call'(Clause,M,CP) )
;
Next is Cl+1, '$set_value'(spy_cl,Next), fail
).
'$check_depth_for_interpreter'(10000000) :-
'$undefined'(get_depth_limit(_), prolog), !.
'$check_depth_for_interpreter'(D1) :-
get_depth_limit(D0),
D0 =\= 0,
D1 is D0-1.
'$debug_catch_call'(Clause,M,CP) :-
'$system_catch'('$call'(Clause,CP,Clause,M),Error,user:'$DebugError'(Error)).
'$call_dynamic_clause'(G,M,Cl) :-
'$system_catch'('$do_execute_dynamic_clause'(G,M,Cl),Error,user:'$DebugError'(Error)).
'$do_execute_dynamic_clause'(G,M,Cl) :-
'$check_depth_for_interpreter'(D),
('$undefined'('$set_depth_limit'(_),prolog) -> true ; '$set_depth_limit'(D)),
CP is '$last_choice_pt',
(
'$db_nb_to_ref'(Cl,M:G,Mod,Ref),
instance(Ref, (G :- Clause)),
(Clause = true -> true ; '$debug_catch_call'(Clause,M,CP) )
;
Next is Cl+1, '$set_value'(spy_cl,Next), fail
).
'$creepcallclause'(G,M,Cl) :-
'$system_catch'('$do_creep_execute'(G,M,Cl),Error,user:'$DebugError'(Error)).
'$do_creep_execute'(G,M,Cl) :-
% fast skip should ignore source mode
'$get_value'(spy_fs,0),
'$some_recordedp'(M:G),
!,
'$check_depth_for_interpreter'(D),
('$undefined'('$set_depth_limit'(_),prolog) -> true ; '$set_depth_limit'(D)),
CP is '$last_choice_pt',
(
'$fetch_clause'(G,M,Cl,Clause),
(Clause = true -> true ;
'$catch_creep_call'(Clause,M,CP)
)
;
Next is Cl+1, '$set_value'(spy_cl,Next), fail
).
'$do_creep_execute'(G,M,Cl) :-
'$creep_execute'(G,M,Cl) ;
Next is Cl+1, '$set_value'(spy_cl,Next), fail.
'$creepcall_log_upd_clause'(G,M,Cl,Index) :-
'$system_catch'('$do_creep_log_upd_execute'(G,M,Cl,Index),Error,user:'$DebugError'(Error)).
'$do_creep_log_upd_execute'(G,M,Cl,Index) :-
'$check_depth_for_interpreter'(D),
('$undefined'('$set_depth_limit'(_),prolog) -> true ; '$set_depth_limit'(D)),
( CP is '$last_choice_pt',
(Index = [] ->
/* We have a single clause */
Cl = 1,
'$clause'(G, M, Clause)
;
Cl1 is Cl-1,
'$fetch_reference_from_index'(Index, Cl1, Ref),
instance(Ref, (G :- Clause))
),
(Clause = true -> true ;
% otherwise fast skip may try to interpret assembly builtins.
'$get_value'(spy_fs,1) -> '$debug_catch_call'(Clause,M,CP) ;
'$catch_creep_call'(Clause,M,CP)
)
;
Next is Cl+1, '$set_value'(spy_cl,Next), fail
).
'$catch_creep_call'(Clause,M,CP) :-
'$system_catch'('$creep_call'(Clause,M,CP),Error,user:'$DebugError'(Error)).
'$creepcall_dynamic_clause'(G,M,Cl) :-
'$system_catch'('$do_creep_execute_dynamic'(G,M,Cl),Error,user:'$DebugError'(Error)).
'$do_creep_execute_dynamic'(G,M,Cl) :-
'$check_depth_for_interpreter'(D),
('$undefined'('$set_depth_limit'(_),prolog) -> true ; '$set_depth_limit'(D)),
CP is '$last_choice_pt',
(
'$db_nb_to_ref'(Cl,M:G,Ref),
instance(Ref, (G :- Clause)),
(Clause = true -> true ;
% otherwise fast skip may try to interpret assembly builtins.
'$get_value'(spy_fs,1) -> '$debug_catch_call'(Clause,M,CP) ;
'$catch_creep_call'(Clause,M,CP)
)
;
Next is Cl+1, '$set_value'(spy_cl,Next), fail
).
'$leave_creep'.
'$creep_execute'(G,M,Cl) :-
'$creep',
'$execute'(G,M,Cl).
'$fetch_clause'(G,M,ClNum,Body) :-
% I'd like an easier way to keep a counter
'$set_value'('$fetching_clauses',1),
'$recordedp'(M:G,Clause,_),
'$get_value'('$fetching_clauses',Num),
( Num = ClNum ->
!,
Clause = (G :- Body)
;
Num1 is Num+1,
'$set_value'('$fetching_clauses',Num1),
fail
).
%'$creep_call'(G,_) :- write(user_error,'$creepcall'(G)), nl(user_error), fail.
'$creep_call'(V,M,_) :- var(V), !,
throw(error(instantiation_error,meta_call(M:V))).
'$creep_call'(A,M,_) :- number(A), !,
throw(error(type_error(callable,A),meta_call(M:A))).
'$creep_call'(R,M,_) :- db_reference(R), !,
throw(error(type_error(callable,R),meta_call(M:R))).
'$creep_call'(M:G,_,CP) :- !,
'$creep_call'(G,M,CP).
'$creep_call'(fail,Module,_) :- !,
'$direct_spy'([Module|fail]).
'$creep_call'(false,Module,_) :- !,
'$direct_spy'([Module|false]).
'$creep_call'(true,Module,_) :- !,
'$direct_spy'([Module|true]).
'$creep_call'(otherwise,Module,_) :- !,
'$direct_spy'([Module|otherwise]).
'$creep_call'((A,B),Module,CP) :- !,
'$creep_call'(A,Module,CP), '$creep_call'(B,Module,CP).
'$creep_call'((X->Y; Z),Module,CP) :- !,
( '$creep_call'(X,Module,CP), !, '$creep_call'(Y,Module,CP); '$creep_call'(Z,Module,CP)).
'$creep_call'((A;B),Module,CP) :- !,
('$creep_call'(A,Module,CP) ; '$creep_call'(B,Module,CP)).
'$creep_call'((A|B),Module,CP) :- !,
('$creep_call'(A,Module,CP) ; '$creep_call'(B,Module,CP)).
'$creep_call'(atom(A),Module,_) :- !,
'$direct_spy'([Module|atom(A)]).
'$creep_call'(atomic(A),Module,_) :- !,
'$direct_spy'([Module|atomic(A)]).
'$creep_call'(integer(A),Module,_) :- !,
'$direct_spy'([Module|integer(A)]).
'$creep_call'(nonvar(A),Module,_) :- !,
'$direct_spy'([Module|nonvar(A)]).
'$creep_call'(var(A),Module,_) :- !,
'$direct_spy'([Module|var(A)]).
'$creep_call'(number(A),Module,_) :- !,
'$direct_spy'([Module|number(A)]).
'$creep_call'(prismitive(A),Module,_) :- !,
'$direct_spy'([Module|primitive(A)]).
'$creep_call'(compound(A),Module,_) :- !,
'$direct_spy'([Module|compound(A)]).
'$creep_call'(float(A),Module,_) :- !,
'$direct_spy'([Module|float(A)]).
'$creep_call'(db_reference(A),Module,_) :- !,
'$direct_spy'([Module|db_reference(A)]).
'$creep_call'(\+ X,Module,_) :- !,
'$direct_spy'([Module|(\+ X)]).
'$creep_call'(not X,Module,_) :- !,
'$direct_spy'([Module|not(X)]).
'$creep_call'(X=Y,Module,_) :- !,
'$direct_spy'([Module|X=Y]).
'$creep_call'(X\=Y,Module,_) :- !,
'$direct_spy'([Module|X\=Y]).
'$creep_call'(X==Y,Module,_) :- !,
'$direct_spy'([Module|X==Y]).
'$creep_call'(X>Y,Module,_) :- !,
'$direct_spy'([Module|X>Y]).
'$creep_call'(X>=Y,Module,_) :- !,
'$direct_spy'([Module|X>=Y]).
'$creep_call'(X<Y,Module,_) :- !,
'$direct_spy'([Module|X<Y]).
'$creep_call'(X=<Y,Module,_) :- !,
'$direct_spy'([Module|X=<Y]).
'$creep_call'(X=:=Y,Module,_) :- !,
'$direct_spy'([Module|X=:=Y]).
'$creep_call'(X=\=Y,Module,_) :- !,
'$direct_spy'([Module|X=\=Y]).
'$creep_call'(arg(X,Y,Z),Module,_) :- !,
'$direct_spy'([Module|arg(X,Y,Z)]).
'$creep_call'(functor(X,Y,Z),Module,_) :- !,
'$direct_spy'([Module|functor(X,Y,Z)]).
'$creep_call'((X->Y),Module,CP) :- !,
CP1 is '$last_choice_pt',
'$creep_call'(X,Module,CP),
'$$cut_by'(CP1),
'$creep_call'(Y,Module,CP).
'$creep_call'(!,Module,CP) :- !,
'$direct_spy'([Module|'!'(CP)]),
% clean up any garbage left here by the debugger.
'$$cut_by'(CP).
'$creep_call'('$cut_by'(X),Module,_) :- !,
'$$cut_by'(X).
'$creep_call'(repeat,Module,_) :- !,
'$direct_spy'([Module|repeat]).
'$creep_call'([A|B],Module,_) :- !,
'$direct_spy'([Module|[A|B]]).
'$creep_call'(A,Module,CP) :-
'$undefined'(A,Module),
functor(A,F,N),
'$recorded'('$import','$import'(S,Module,F,N),_), !,
'$creep_call'(A,S,CP).
'$creep_call'(A,Module,_) :-
'$direct_spy'([Module|A]).
%'$creep'(G) :- $current_module(M),write(user_error,[creep,M,G]),nl(user_error),fail.
'$creep'(G) :-
'$get_value'('$alarm', true), !,
'$set_value'('$alarm', []),
( '$recorded'('$alarm_handler',A,_) ->
'$execute'(A),
G=[M|Goal]
;
true
),
'$execute'(M:Goal).
'$creep'(_) :-
'$get_value'('$throw', true), !,
'$set_value'('$throw', false),
abort.
'$creep'([_|'$trace'(P,G,Module,L)]) :- !,
'$trace'(P,G,Module,L).
'$creep'([_|'$creep_call'(G,Mod,CP)]) :- !,
'$creep_call'(G,Mod,CP).
'$creep'([_|'$leave_creep']) :- !.
'$creep'(G) :- '$direct_spy'(G).
'$trace'(P,'!'(_),Mod,L) :- !,
'$trace'(P,!,Mod,L).
'$trace'(P,G,Mod,L) :-
'$chk'(P,L,G,Mod,SL),
'$msg'(P,G,Mod,L,SL).
'$trace'(_,_,_,_).
'$msg'(P,G,Module,L,SL):-
flush_output(user_output),
flush_output(user_error),
'$get_value'(debug,1),
repeat,
('$pred_being_spied'(G,Module) -> write(user_error,'*') ; write(user_error,' ')),
( SL = L -> write(user_error,'>') ; write(user_error,' ')),
write(user_error,' ('), write(user_error,L), write(user_error,') '),
write(user_error,P), write(user_error,': '),
( Module\=prolog,
Module\=user -> write(user_error,Module),write(user_error,':');
true
),
'$debugger_write'(user_error,G),
(
'$unleashed'(P),
nl(user_error)
;
write(user_error,' ? '), get0(user_input,C),
'$action'(C,P,L,G),
'$skipeol'(C)
) ,
!, fail.
'$unleashed'(call) :- '$get_value'('$leash',L), L /\ 2'1000 =:= 0.
'$unleashed'(exit) :- '$get_value'('$leash',L), L /\ 2'0100 =:= 0.
'$unleashed'(redo) :- '$get_value'('$leash',L), L /\ 2'0010 =:= 0.
'$unleashed'(fail) :- '$get_value'('$leash',L), L /\ 2'0001 =:= 0.
'$debugger_write'(Stream,G) :-
'$recorded'('$debug_depth',D,_), !,
write_depth(OS,OL),
write_depth(D,D),
'$write_deb2'(Stream,G),
write_depth(OS,OL).
'$debugger_write'(Stream,G) :- '$write_deb2'(Stream,G).
'$write_deb2'(Stream, G) :-
'$recorded'('$print_options','$debugger'(OUT),_), !,
write_term(Stream, G, OUT).
'$write_deb2'(Stream, G) :-
writeq(Stream, G).
/*
'$chk'(P,L,G,_) :-
'$get_value'(spy_leap,Leap),
'$get_value'(spy_sp,SP),
'$access_yap_flags'(10,SC),
'$get_value'(spy_sl,SL),
'$get_value'(spy_fs,FS),
'$get_value'(spy_cl,CL),
write(user_error,[chk,L,P,Leap,SP,SC,SL,FS,CL,G]), nl(user_error),
fail.
*/
'$chk'(_,_,[_|_],_,_) :- !, fail.
'$chk'(P,L,G,Mod,SL) :-
'$get_value'(spy_leap,Leap),
(Leap = 0 -> true; % not leaping
('$pred_being_spied'(G,Mod) ; Leap = L), % leaping or quasileaping
'$set_value'(spy_leap,0) ),
'$get_value'(spy_sp,SP),
(SP = 0; SP = P), % the current skipport or no skipport
'$access_yap_flags'(10,SC),
(SC = 1; '$pred_being_spied'(G,Mod)),
'$get_value'(spy_sl,SL),
(SL = 0; SL = L, '$set_value'(spy_sl,0), '$set_value'(spy_fs,0)),
'$set_value'(spy_sp,0), !.
'$skipeol'(10) :- !.
'$skipeol'(_) :- get0(user,C), '$skipeol'(C).
'$action'(10,_,_,_) :- !, % newline creep
'$set_yap_flags'(10,1).
'$action'(33,_,_,_) :- !, % ! g execute
read(user,G),
% don't allow yourself to be caught by creep.
'$access_yap_flags'(10, CL),
'$set_yap_flags'(10, 0),
( '$execute'(G) -> true ; true),
'$set_yap_flags'(10, CL),
!, fail.
'$action'(60,_,_,_) :- !, % <Depth
'$new_deb_depth'.
'$action'(94,_,_,G) :- !,
'$print_deb_sterm'(G), fail.
'$action'(97,_,_,_) :- !, abort. % a abort
'$action'(98,_,_,_) :- !, break, % b break
fail.
'$action'(99,call,_,_) :- !, % c creep
'$set_yap_flags'(10,1).
'$action'(101,_,_,_) :- !, % e exit
halt.
'$action'(102,P,L,_) :- !, % f fail
( \+ P = fail, !; '$ilgl'(102) ),
'$set_value'(spy_sp,fail),
'$set_value'(spy_sl,L).
'$action'(104,_,_,_) :- !, % h help
write(user_error,'newline creep a abort'), nl(user_error),
write(user_error,'c creep e exit'), nl(user_error),
write(user_error,'f fail h help'), nl(user_error),
write(user_error,'l leap r retry'), nl(user_error),
write(user_error,'s skip t fastskip'), nl(user_error),
write(user_error,'q quasiskip k quasileap'), nl(user_error),
write(user_error,'b break n no debug'), nl(user_error),
write(user_error,'p print d display'), nl(user_error),
write(user_error,'<D depth D < full term'), nl(user_error),
write(user_error,'+ spy this - nospy this'), nl(user_error),
write(user_error,'^ view subg ^^ view using'), nl(user_error),
write(user_error,'! g execute goal'), nl(user_error),
'$skipeol'(104), fail.
'$action'(63,_,_,_) :- !, % ? help
write(user_error,'newline creep a abort'), nl(user_error),
write(user_error,'c creep e exit'), nl(user_error),
write(user_error,'f fail h help'), nl(user_error),
write(user_error,'l leap r retry'), nl(user_error),
write(user_error,'s skip t fastskip'), nl(user_error),
write(user_error,'q quasiskip k quasileap'), nl(user_error),
write(user_error,'b break n no debug'), nl(user_error),
write(user_error,'p print d display'), nl(user_error),
write(user_error,'<D depth D < full term'), nl(user_error),
write(user_error,'+ spy this - nospy this'), nl(user_error),
write(user_error,'^ view subg ^^ view using'), nl(user_error),
write(user_error,'! g execute goal'), nl(user_error),
'$skipeol'(104), fail.
'$action'(112,_,_,G) :- !, % p print
print(user_error,G), nl(user_error),
'$skipeol'(112), fail.
'$action'(100,_,_,G) :- !, % d display
display(user_error,G), nl(user_error),
'$skipeol'(100), fail.
'$action'(113,_,L,_) :- !, % k quasi skip
'$set_value'(spy_leap,L).
'$action'(108,_,_,_) :- !, % l leap
'$set_value'(spy_leap,1).
'$action'(110,_,_,_) :- !, % n nodebug
nodebug.
'$action'(107,_,_,_) :- !, % k quasi leap
'$set_yap_flags'(10,0).
'$action'(114,P,L,_) :- !, % r retry
( P=call, !, '$ilgl'(114); true),
'$set_value'(spy_sp,call),
'$set_value'(spy_sl,L),
write(user_error,'[ retry ]'), nl(user_error).
'$action'(115,P,L,_) :- !, % s skip
( P=call; P=redo; '$ilgl'(115) ), !,
'$set_value'(spy_sl,L).
'$action'(116,P,L,_) :- !, % t fast skip
( P=call; P=redo; '$ilgl'(116) ), !,
'$set_value'(spy_sl,L), '$set_value'(spy_fs,1).
'$action'(43,_,_,G) :- !, % + spy this
functor(G,F,N), spy(F/N),
'$skipeol'(43), fail.
'$action'(45,_,_,G) :- !, % - nospy this
functor(G,F,N), nospy(F/N),
'$skipeol'(45), fail.
'$action'(C,_,_,_) :- '$ilgl'(C).
'$ilgl'(C) :- '$skipeol'(C), write(user_error,'[ Illegal option. Use h for help. ]'),
nl(user_error), fail.
'$print_deb_sterm'(G) :-
'$get_sterm_list'(L), !,
'$deb_get_sterm_in_g'(L,G,A),
recorda('$debug_sub_skel',L,_),
nl(user_error), write(user_error,A), nl(user_error), nl(user_error).
'$print_deb_sterm'(_) :- '$skipeol'(94).
'$get_sterm_list'(L) :-
get0(user_input,C),
'$deb_inc_in_sterm_oldie'(C,L0,CN),
'$get_sterm_list'(L0,CN,0,L).
'$deb_inc_in_sterm_oldie'(94,L0,CN) :- !,
get0(user_input,CN),
( '$recorded'('$debug_sub_skel',L0,_) -> true ;
CN = [] ).
'$deb_inc_in_sterm_oldie'(C,[],C).
'$get_sterm_list'(L0,C,N,L) :-
( C =:= "^", N \== 0 -> get0(CN),
'$get_sterm_list'([N|L0],CN,0,L) ;
C >= "0", C =< "9" -> NN is 10*N+C-"0", get0(CN),
'$get_sterm_list'(L0,CN,NN,L);
C =:= 10 -> (N =:= 0 -> L = L0 ; L=[N|L0]) ).
'$deb_get_sterm_in_g'([],G,G).
'$deb_get_sterm_in_g'([H|T],G,A) :-
'$deb_get_sterm_in_g'(T,G,A1),
arg(H,A1,A).
'$new_deb_depth' :- '$get_deb_depth'(0,D),
( '$recorded'('$debug_depth',_,R) -> erase(R) ; true ),
( D \= 0 -> recorda('$debug_depth',D,_) ),
fail.
'$get_deb_depth'(X0,XF) :-
get0(user_input,C),
'$get_depth_handle_char'(C,X0,XF).
'$get_depth_handle_char'(10,X,X) :- !.
'$get_depth_handle_char'(C,X0,XF) :-
C >= "0", C =< "9", !,
XI is X0*10+C-"0",
'$get_deb_depth'(XI,XF).
'$get_depth_handle_char'(C,X,X) :- '$skipeol'(C).
'$DebugError'(error(Msg, Where )) :- !,
'$output_error_message'(Msg, Where), !,
fail.
%
% do not try to handle other throws or aborts.
%
'$DebugError'(T) :- !,
throw(T).
'$init_spy_cl'(G,M) :-
% dynamic, immediate update procedure.
'$flags'(G,M,F,F), F /\ 16'2000 =\= 0, !,
( '$db_first_age'(M:G,A) ->
'$set_value'(spy_cl, A) ;
% no clauses for pred.
'$set_value'(spy_cl, 1) ).
'$init_spy_cl'(_,_) :-
'$set_value'(spy_cl, 1).