399 lines
9.8 KiB
Prolog
Executable File
399 lines
9.8 KiB
Prolog
Executable File
/*************************************************************************
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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: control.yap *
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* Last rev: 20/08/09 *
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* mods: *
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* comments: control predicates available in yap *
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* *
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*************************************************************************/
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:- system_module( '$_control', [at_halt/1,
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b_getval/2,
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break/0,
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call/2,
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call/3,
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call/4,
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call/5,
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call/6,
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call/7,
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call/8,
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call/9,
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call/10,
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call/11,
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call/12,
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call_cleanup/2,
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call_cleanup/3,
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forall/2,
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garbage_collect/0,
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garbage_collect_atoms/0,
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gc/0,
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grow_heap/1,
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grow_stack/1,
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halt/0,
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halt/1,
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if/3,
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ignore/1,
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nb_getval/2,
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nogc/0,
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notrace/1,
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once/1,
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prolog_current_frame/1,
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prolog_initialization/1,
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setup_call_catcher_cleanup/4,
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setup_call_cleanup/3,
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version/0,
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version/1], ['$run_atom_goal'/1,
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'$set_toplevel_hook'/1]).
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:- use_system_module( '$_boot', ['$call'/4,
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'$disable_debugging'/0,
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'$do_live'/0,
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'$enable_debugging'/0,
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'$system_catch'/4,
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'$version'/0]).
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:- use_system_module( '$_debug', ['$init_debugger'/0]).
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:- use_system_module( '$_errors', ['$do_error'/2]).
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:- use_system_module( '$_utils', ['$getval_exception'/3]).
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:- use_system_module( '$coroutining', [freeze_goal/2]).
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once(G) :- '$execute'(G), !.
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forall(Cond, Action) :- \+((Cond, \+(Action))).
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ignore(Goal) :- (Goal->true;true).
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notrace(G) :-
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strip_module(G, M, G1),
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( '$$save_by'(CP),
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'$debug_stop'( State ),
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'$call'(G1, CP, G, M),
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'$$save_by'(CP2),
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(CP == CP2 -> ! ; '$debug_state'( NState ), ( true ; '$debug_restart'(NStart), fail ) ),
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'$debug_restart'( State )
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;
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'$debug_restart'( State ),
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fail
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).
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if(X,Y,Z) :-
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yap_hacks:env_choice_point(CP0),
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(
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CP is '$last_choice_pt',
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'$call'(X,CP,if(X,Y,Z),M),
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'$execute'(X),
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'$clean_ifcp'(CP),
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'$call'(Y,CP,if(X,Y,Z),M)
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;
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'$call'(Z,CP,if(X,Y,Z),M)
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).
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call(X,A) :- '$execute'(X,A).
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call(X,A1,A2) :- '$execute'(X,A1,A2).
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call(X,A1,A2,A3) :- '$execute'(X,A1,A2,A3).
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call(X,A1,A2,A3,A4) :- '$execute'(X,A1,A2,A3,A4).
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call(X,A1,A2,A3,A4,A5) :- '$execute'(X,A1,A2,A3,A4,A5).
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call(X,A1,A2,A3,A4,A5,A6) :- '$execute'(X,A1,A2,A3,A4,A5,A6).
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call(X,A1,A2,A3,A4,A5,A6,A7) :- '$execute'(X,A1,A2,A3,A4,A5,A6,A7).
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call(X,A1,A2,A3,A4,A5,A6,A7,A8) :- '$execute'(X,A1,A2,A3,A4,A5,A6,A7,A8).
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call(X,A1,A2,A3,A4,A5,A6,A7,A8,A9) :- '$execute'(X,A1,A2,A3,A4,A5,A6,A7,A8,A9).
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call(X,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :- '$execute'(X,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10).
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call(X,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,A11) :- '$execute'(X,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,A11).
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call_cleanup(Goal, Cleanup) :-
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setup_call_catcher_cleanup(true, Goal, _Catcher, Cleanup).
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call_cleanup(Goal, Catcher, Cleanup) :-
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setup_call_catcher_cleanup(true, Goal, Catcher, Cleanup).
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setup_call_cleanup(Setup, Goal, Cleanup) :-
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setup_call_catcher_cleanup(Setup, Goal, _Catcher, Cleanup).
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setup_call_catcher_cleanup(Setup, Goal, Catcher, Cleanup) :-
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yap_hacks:disable_interrupts,
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'$check_goal_for_setup_call_cleanup'(Setup, setup_call_cleanup(Setup, Goal, Cleanup)),
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catch('$do_setup'(Setup),Exception,'$handle_broken_setup'(Exception)),
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'$check_goal_for_setup_call_cleanup'(Cleanup, setup_call_cleanup(Setup, Goal, Cleanup)),
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'$safe_call_cleanup'(Goal,Cleanup,Catcher,Exception).
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% make sure we don't lose interrupts if we get exceptions
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% with setup.
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'$handle_broken_setup'(Exception) :-
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yap_hacks:enable_interrupts,
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throw(Exception).
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'$check_goal_for_setup_call_cleanup'(Goal, G) :-
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strip_module(Goal, _, MG),
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(
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var(MG)
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->
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yap_hacks:enable_interrupts,
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'$do_error'(instantiation_error,G)
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;
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true
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).
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% this is simple, do nothing
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'$do_setup'(A:true) :- atom(A), !.
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% this is tricky: please don't forget that interrupts are disabled at this point
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% and that they will only be enabled after setting up Cleanup
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'$do_setup'(Setup) :-
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(
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'$execute'(Setup),
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% we don't need to care about enabling interrupts
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!
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;
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% reenable interrupts if Setup failed
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yap_hacks:enable_interrupts,
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fail
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).
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'$cleanup_exception'(Exception, exception(Exception), Cleanup) :- !,
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% whatever happens, let exception go through
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catch('$clean_call'(_,Cleanup),_,true),
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throw(Exception).
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'$cleanup_exception'(Exception, _, _) :-
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throw(Exception).
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'$safe_call_cleanup'(Goal, Cleanup, Catcher, Exception) :-
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'$current_choice_point'(MyCP1),
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'$coroutining':freeze_goal(Catcher, '$clean_call'(Active, Cleanup)),
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(
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yap_hacks:trail_suspension_marker(Catcher),
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yap_hacks:enable_interrupts,
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'$current_choice_point'(CP0),
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'$execute'(Goal),
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'$current_choice_point'(CPF),
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(
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CP0 =:= CPF
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->
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Catcher = exit,
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!
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;
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true
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)
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;
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Catcher = fail,
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fail
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).
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'$holds_true'.
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% The first argument is used by JumpEnv to verify if a throw
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% is going to be handled by the cleanup catcher. If it is so,
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% clean_call will not be called from JumpToEnv.
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'$clean_call'(_, Cleanup) :-
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'$execute'(Cleanup), !.
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'$clean_call'(_, _).
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'$cc_check_throw' :-
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'$nb_getval'('$catch', Ball, fail),
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throw(Ball).
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%%% Some "dirty" predicates
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% Only efective if yap compiled with -DDEBUG
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% this predicate shows the code produced by the compiler
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'$show_code' :- '$debug'(0'f). %' just make emacs happy
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grow_heap(X) :- '$grow_heap'(X).
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grow_stack(X) :- '$grow_stack'(X).
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%
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% gc() expects to be called from "call". Make sure it has an
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% environment to return to.
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%
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%garbage_collect :- save(dump), '$gc', save(dump2).
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garbage_collect :-
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'$gc'.
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gc :-
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yap_flag(gc,on).
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nogc :-
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yap_flag(gc,off).
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garbage_collect_atoms :-
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'$atom_gc'.
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'$force_environment_for_gc'.
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'$good_list_of_character_codes'(V) :- var(V), !.
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'$good_list_of_character_codes'([]).
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'$good_list_of_character_codes'([X|L]) :-
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'$good_character_code'(X),
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'$good_list_of_character_codes'(L).
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'$good_character_code'(X) :- var(X), !.
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'$good_character_code'(X) :- integer(X), X > -2, X < 256.
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prolog_initialization(G) :- var(G), !,
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'$do_error'(instantiation_error,initialization(G)).
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prolog_initialization(T) :- callable(T), !,
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'$assert_init'(T).
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prolog_initialization(T) :-
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'$do_error'(type_error(callable,T),initialization(T)).
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'$assert_init'(T) :- recordz('$startup_goal',T,_), fail.
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'$assert_init'(_).
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version :- '$version'.
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version(V) :- var(V), !,
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'$do_error'(instantiation_error,version(V)).
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version(T) :- atom(T), !, '$assert_version'(T).
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version(T) :-
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'$do_error'(type_error(atom,T),version(T)).
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'$assert_version'(T) :- recordz('$version',T,_), fail.
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'$assert_version'(_).
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'$set_toplevel_hook'(_) :-
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recorded('$toplevel_hooks',_,R),
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erase(R),
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fail.
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'$set_toplevel_hook'(H) :-
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recorda('$toplevel_hooks',H,_),
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fail.
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'$set_toplevel_hook'(_).
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nb_getval(GlobalVariable, Val) :-
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'$nb_getval'(GlobalVariable, Val, Error),
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(var(Error)
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->
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true
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;
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'$getval_exception'(GlobalVariable, Val, nb_getval(GlobalVariable, Val)) ->
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nb_getval(GlobalVariable, Val)
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;
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'$do_error'(existence_error(variable, GlobalVariable),nb_getval(GlobalVariable, Val))
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).
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b_getval(GlobalVariable, Val) :-
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'$nb_getval'(GlobalVariable, Val, Error),
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(var(Error)
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->
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true
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;
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'$getval_exception'(GlobalVariable, Val, b_getval(GlobalVariable, Val)) ->
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true
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;
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'$do_error'(existence_error(variable, GlobalVariable),b_getval(GlobalVariable, Val))
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).
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/* This is the break predicate,
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it saves the importante data about current streams and
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debugger state */
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'$debug_state'(state(Trace, Debug, Jump, Run, SPY_GN, GList)) :-
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'$init_debugger',
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nb_getval('$trace',Trace),
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nb_getval('$debug_jump',Jump),
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nb_getval('$debug_run',Run),
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'$swi_current_prolog_flag'(debug, Debug),
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nb_getval('$spy_gn',SPY_GN),
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b_getval('$spy_glist',GList).
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'$debug_stop'( State ) :-
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'$debug_state'( State ),
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b_setval('$trace',off),
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'$swi_set_prolog_flag'(debug, false),
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b_setval('$spy_glist',[]),
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'$disable_debugging'.
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'$debug_restart'(state(Trace, Debug, Jump, Run, SPY_GN, GList)) :-
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b_setval('$spy_glist',GList),
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b_setval('$spy_gn',SPY_GN),
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'$swi_set_prolog_flag'(debug, Debug),
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b_setval('$debug_jump',Jump),
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b_setval('$debug_run',Run),
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b_setval('$trace',Trace),
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'$enable_debugging'.
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break :-
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'$init_debugger',
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nb_getval('$trace',Trace),
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nb_setval('$trace',off),
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nb_getval('$debug_jump',Jump),
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nb_getval('$debug_run',Run),
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'$swi_current_prolog_flag'(debug, Debug),
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'$swi_set_prolog_flag'(debug, false),
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'$break'( true ),
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nb_getval('$spy_gn',SPY_GN),
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b_getval('$spy_glist',GList),
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b_setval('$spy_glist',[]),
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current_output(OutStream), current_input(InpStream),
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'$swi_current_prolog_flag'(break_level, NBL ),
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format(user_error, '% Break (level ~w)~n', [NBL]),
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'$do_live',
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!,
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set_value('$live','$true'),
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b_setval('$spy_glist',GList),
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nb_setval('$spy_gn',SPY_GN),
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set_input(InpStream),
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set_output(OutStream),
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'$swi_set_prolog_flag'(debug, Debug),
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nb_setval('$debug_jump',Jump),
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nb_setval('$debug_run',Run),
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nb_setval('$trace',Trace),
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'$break'( false ).
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at_halt(G) :-
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recorda('$halt', G, _),
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fail.
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at_halt(_).
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halt :-
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print_message(informational, halt),
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fail.
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halt :-
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'$halt'(0).
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halt(_) :-
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recorded('$halt', G, _),
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call(G),
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fail.
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halt(X) :-
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'$sync_mmapped_arrays',
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set_value('$live','$false'),
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'$halt'(X).
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prolog_current_frame(Env) :-
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Env is '$env'.
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'$run_atom_goal'(GA) :-
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'$current_module'(Module),
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atom_to_term(GA, G, _),
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'$system_catch'('$query'(once(G), []),Module,Error,user:'$Error'(Error)).
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'$add_dot_to_atom_goal'([],[0'.]) :- !. %'
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'$add_dot_to_atom_goal'([0'.],[0'.]) :- !.
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'$add_dot_to_atom_goal'([C|Gs0],[C|Gs]) :-
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'$add_dot_to_atom_goal'(Gs0,Gs).
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