38247e38fc
simplification of module handling; new timestamp implementation git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@52 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
206 lines
5.9 KiB
Prolog
206 lines
5.9 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: corout.pl *
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* Last rev: *
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* mods: *
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* comments: Coroutines implementation *
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* *
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*************************************************************************/
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%depth_bound_call(A,D) :-
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%write(depth_bound_call(A,D)), nl, fail.
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depth_bound_call(A,D) :-
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'$execute_under_depth_limit'(A,D).
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$old_depth_bound_call(A,D) :-
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'$check_callable'(A,A),
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'$user_call_depth_limited'(A, D).
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'$user_call_depth_limited'(V,D) :- var(V), !,
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throw(error(instantiation_error,V)).
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'$user_call_depth_limited'(A,D) :- number(A), !,
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throw(error(type_error(callable,A),A,D)).
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'$user_call_depth_limited'(R,D) :- db_reference(R), !,
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throw(error(type_error(callable,R),R)).
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'$user_call_depth_limited'(A,D) :-
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'$access_yap_flags'(10,V),
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V \= 0, !,
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'$save_current_choice_point'(CP),
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'$spied_call_depth_limited'(A,CP,D).
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'$user_call_depth_limited'(A,D) :-
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'$save_current_choice_point'(CP),
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'$call_depth_limited'(A,CP,D).
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'$call_depth_limited'(M:G,CP,D) :- !,
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( '$current_module'(M) ->
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'$check_callable'(G,M:G),
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'$call_depth_limited'(G,CP,D)
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;
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'$check_callable'(G,M:G),
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'$mod_switch'(M,'$call_depth_limited'(G,CP,D) )
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).
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'$call_depth_limited'(fail,_,_) :- !, fail.
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'$call_depth_limited'(false,_,_) :- !, false.
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'$call_depth_limited'(true,_,_) :- !.
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'$call_depth_limited'(otherwise,_,_) :- !.
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'$call_depth_limited'((A,B),CP,D) :- !,
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'$check_callable'(A,(A,B)),
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D1 is D+1,
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'$call_depth_limited'(A,CP,D1),
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'$check_callable'(B,(A,B)),
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'$call_depth_limited'(B,CP,D1).
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'$call_depth_limited'((X->Y),CP,D) :- !,
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'$check_callable'(X,(X->Y)),
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CP1 is local_sp,
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D1 is D+1,
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'$call_depth_limited'(X,CP,D1),
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'$$cut_by'(CP1),
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'$check_callable'(Y,(X->Y)),
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'$call_depth_limited'(Y,CP,D1).
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'$call_depth_limited'((X->Y; Z),CP,D) :- !,
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'$check_callable'(X,(X->Y;Z)),
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D1 is D+1,
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(
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'$call_depth_limited'(X,CP,D1), !,
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'$check_callable'(Y,(X->Y;Z)),
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'$call_depth_limited'(Y,CP,D1)
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;
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'$check_callable'(Z,(X->Y;Z)),
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'$call_depth_limited'(Z,CP,D1)
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).
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'$call_depth_limited'((A;B),CP,D) :- !,
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'$check_callable'(A,(A;B)),
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D1 is D+1,
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(
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'$call_depth_limited'(A,CP,D1)
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;
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'$check_callable'(B,(A;B)),
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'$call_depth_limited'(B,CP,D1)
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).
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'$call_depth_limited'((A|B),CP,D) :- !,
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'$check_callable'(A,(A|B)),
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D1 is D+1,
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(
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'$call_depth_limited'(A,CP,D1)
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;
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'$check_callable'(B,(A|B)),
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'$call_depth_limited'(B,CP,D1)
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).
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'$call_depth_limited'(\+ X,CP,D) :- !,
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'$check_callable'(X, \+ X),
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\+ '$call_depth_limited'(X,CP,D).
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'$call_depth_limited'(not X,CP,D) :- !,
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'$check_callable'(X, not X),
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\+ '$call_depth_limited'(X,CP,D).
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'$call_depth_limited'(!,CP,_) :- $$cut_by(CP).
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'$call_depth_limited'(repeat,_,_) :- !, $repeat.
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'$call_depth_limited'([A|B],_,_) :- !, '$csult'([A|B]).
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'$call_depth_limited'(A,CP,D) :-
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( '$undefined'(A) ->
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functor(A,F,N), $current_module(M),
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( '$recorded'($import,$import(S,M,F,N),_) ->
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'$call_depth_limited'(S:A,CP,D) ;
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get_depth_limit(D0),
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'$set_depth_limit'(D),
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'$undefp'([M|A]),
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'$set_depth_limit'(D0),
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'$ensure_env_for_call_depth_limited'
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)
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;
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get_depth_limit(D0),
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'$set_depth_limit'(D),
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'$execute0'(A),
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'$set_depth_limit'(D0),
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'$ensure_env_for_call_depth_limited'
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).
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'$spied_call_depth_limited'(M:G,CP,D) :- !,
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'$check_callable'(G,M:G),
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'$mod_switch'(M,'$spied_call_depth_limited'(G,CP,D)).
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'$spied_call_depth_limited'(fail,_,_) :- !, fail.
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'$spied_call_depth_limited'(false,_,_) :- !, false.
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'$spied_call_depth_limited'(true,_,_) :- !.
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'$spied_call_depth_limited'(otherwise,_,_) :- !.
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'$spied_call_depth_limited'((A,B),CP,D) :- !,
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'$check_callable'(A,(A,B)),
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D1 is D+1,
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'$spied_call_depth_limited'(A,CP,D1),
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'$check_callable'(B,(A,B)),
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'$spied_call_depth_limited'(B,CP,D1).
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'$spied_call_depth_limited'((X->Y),CP,D) :- !,
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'$check_callable'(X,(X->Y)),
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CP1 is local_sp,
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D1 is D+1,
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'$spied_call_depth_limited'(X,CP,D1),
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'$$cut_by'(CP1),
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'$check_callable'(Y,(X->Y)),
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'$spied_call_depth_limited'(Y,CP,D1).
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'$spied_call_depth_limited'((X->Y; Z),CP, D) :- !,
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'$check_callable'(X,(X->Y;Z)),
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D1 is D+1,
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(
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'$spied_call_depth_limited'(X,CP,D1), !,
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'$check_callable'(Y,(X->Y;Z)),
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'$spied_call_depth_limited'(Y,CP,D1)
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;
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'$check_callable'(Z,(X->Y;Z)),
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'$spied_call_depth_limited'(Z,CP,D1)
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).
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'$spied_call_depth_limited'((A;B),CP,D) :- !,
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'$check_callable'(A,(A;B)),
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D1 is D+1,
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(
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'$spied_call_depth_limited'(A,CP,D1)
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;
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'$check_callable'(B,(A;B)),
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'$spied_call_depth_limited'(B,CP,D1)
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).
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'$spied_call_depth_limited'((A|B),CP,D) :- !,
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'$check_callable'(A,(A|B)),
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D1 is D+1,
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(
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'$spied_call_depth_limited'(A,CP,D1)
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;
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'$check_callable'(B,(A|B)),
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'$spied_call_depth_limited'(B,CP,D1)
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).
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'$spied_call_depth_limited'(\+ X,CP,D) :- !,
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'$check_callable'(X, \+ X),
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\+ '$spied_call_depth_limited'(X,CP,D).
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'$spied_call_depth_limited'(not X,CP,D) :- !,
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'$check_callable'(X, not X),
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\+ '$spied_call_depth_limited'(X,CP,D).
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'$spied_call_depth_limited'(!,CP,_) :- $$cut_by(CP).
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'$spied_call_depth_limited'(repeat,_,_) :- !, '$repeat'.
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'$spied_call_depth_limited'([A|B],_,_) :- !, '$csult'([A|B]).
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'$spied_call_depth_limited'(A,CP,D) :-
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( '$undefined'(A) ->
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functor(A,F,N), $current_module(M),
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( '$recorded'($import,$import(S,M,F,N),_) ->
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'$spied_call_depth_limited'(S:A,CP,D) ;
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get_depth_limit(D0),
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'$set_depth_limit'(D),
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'$spy'(A),
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'$set_depth_limit'(D0),
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'$ensure_env_for_call_depth_limited'
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)
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;
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get_depth_limit(D0),
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'$set_depth_limit'(D),
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'$spy'(A),
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'$set_depth_limit'(D0),
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'$ensure_env_for_call_depth_limited'
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).
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'$ensure_env_for_call_depth_limited'.
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