87 lines
2.0 KiB
Prolog
87 lines
2.0 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 1985-2010 *
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* *
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**************************************************************************
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* *
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* File: save.yap *
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* Last rev: 11/29/10 *
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* mods: *
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* comments: Some utility predicates to support save/restore in yap *
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* *
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*************************************************************************/
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:- system_module( '$_save', [], []).
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%%% Saving and restoring a computation
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/*
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save(A) :- save(A,_).
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save(A,_) :- var(A), !,
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'$do_error'(instantiation_error,save(A)).
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save(A,OUT) :- atom(A), !, atom_codes(A,S), '$save'(S,OUT).
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save(S,OUT) :- '$save'(S,OUT).
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save_program(A) :- var(A), !,
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'$do_error'(instantiation_error,save_program(A)).
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save_program(A) :- atom(A), !,
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atom_codes(A,S),
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'$save_program2'(S, true).
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save_program(S) :- '$save_program2'(S, true).
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save_program(A, G) :- var(A), !,
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'$do_error'(instantiation_error, save_program(A,G)).
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save_program(A, G) :- var(G), !,
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'$do_error'(instantiation_error, save_program(A,G)).
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save_program(A, G) :- \+ callable(G), !,
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'$do_error'(type_error(callable,G), save_program(A,G)).
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save_program(A, G) :-
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( atom(A) -> atom_codes(A,S) ; A = S),
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'$save_program2'(S, G),
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fail.
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save_program(_,_).
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'$save_program2'(S,G) :-
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(
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G == true
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->
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true
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;
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recorda('$restore_goal', G ,R)
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),
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(
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'$undefined'(reload_foreign_libraries, shlib)
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->
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true
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;
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recorda('$reload_foreign_libraries', true, R1)
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),
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'$save_program'(S),
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(
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var(R1)
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->
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true
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;
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erase(R1)
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),
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(
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var(R)
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->
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true
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;
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erase(R)
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),
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fail.
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'$save_program2'(_,_).
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restore(A) :- var(A), !,
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'$do_error'(instantiation_error,restore(A)).
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restore(A) :- atom(A), !, name(A,S), '$restore'(S).
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restore(S) :- '$restore'(S).
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*/
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