396 lines
9.4 KiB
Prolog
396 lines
9.4 KiB
Prolog
:- system_module( '$_debug', [debug/0,
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debugging/0,
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leash/1,
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nodebug/0,
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(nospy)/1,
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nospyall/0,
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notrace/0,
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(spy)/1,
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trace/0], [
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'$init_debugger'/0]).
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:- use_system_module( '$_boot', ['$find_goal_definition'/4,
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'$system_catch'/4]).
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:- use_system_module( '$_errors', ['$Error'/1,
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'$do_error'/2]).
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:- use_system_module( '$_init', ['$system_module'/1]).
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:- use_system_module( '$_modules', ['$meta_expansion'/6]).
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:- use_system_module( '$_preds', ['$clause'/4]).
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/*-----------------------------------------------------------------------------
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Debugging / creating spy points
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-----------------------------------------------------------------------------*/
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/** @defgroup Deb_Preds Debugging Predicates
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@ingroup builtins
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@{
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The
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following predicates are available to control the debugging of
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programs:
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+ debug
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Switches the debugger on.
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+ debuggi=
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r
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g
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Outputs status information about the debugger which includes the leash
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mode and the existing spy-points, when the debugger is on.
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+ nodebug
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Switches the debugger off.
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*/
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:- op(900,fx,[spy,nospy]).
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'$init_debugger' :-
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'__NB_getval__'('$trace', _, fail), !.
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'$init_debugger' :-
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'$debugger_input',
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'__NB_setval__'('$trace',off),
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'__NB_setval__'('$if_skip_mode',no_skip),
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'__NB_setval__'('$spy_glist',[]),
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'__NB_setval__'('$spy_gn',1),
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'__NB_setval__'('$debug_run',off),
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'__NB_setval__'('$debug_jump',false).
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% First part : setting and reseting spy points
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% $suspy does most of the work
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'$suspy'(V,S,M) :- var(V) , !,
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'$do_error'(instantiation_error,M:spy(V,S)).
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'$suspy'((M:S),P,_) :- !,
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'$suspy'(S,P,M).
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'$suspy'([],_,_) :- !.
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'$suspy'([F|L],S,M) :- !, ( '$suspy'(F,S,M) ; '$suspy'(L,S,M) ).
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'$suspy'(F/N,S,M) :- !,
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functor(T,F,N),
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'$do_suspy'(S, F, N, T, M).
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'$suspy'(A,S,M) :- atom(A), !,
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'$suspy_predicates_by_name'(A,S,M).
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'$suspy'(P,spy,M) :- !,
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'$do_error'(domain_error(predicate_spec,P),spy(M:P)).
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'$suspy'(P,nospy,M) :-
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'$do_error'(domain_error(predicate_spec,P),nospy(M:P)).
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'$suspy_predicates_by_name'(A,S,M) :-
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% just check one such predicate exists
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(
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current_predicate(A,M:_)
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->
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M = EM,
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A = NA
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;
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recorded('$import','$import'(EM,M,GA,_,A,_),_),
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functor(GA,NA,_)
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),
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!,
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'$do_suspy_predicates_by_name'(NA,S,EM).
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'$suspy_predicates_by_name'(A,spy,M) :- !,
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print_message(warning,no_match(spy(M:A))).
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'$suspy_predicates_by_name'(A,nospy,M) :-
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print_message(warning,no_match(nospy(M:A))).
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'$do_suspy_predicates_by_name'(A,S,M) :-
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current_predicate(A,M:T),
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functor(T,A,N),
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'$do_suspy'(S, A, N, T, M).
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'$do_suspy_predicates_by_name'(A, S, M) :-
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recorded('$import','$import'(EM,M,_,T,A,N),_),
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'$do_suspy'(S, A, N, T, EM).
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%
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% protect against evil arguments.
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%
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'$do_suspy'(S, F, N, T, M) :-
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recorded('$import','$import'(EM,M,T0,_,F,N),_), !,
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functor(T0, F0, N0),
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'$do_suspy'(S, F0, N0, T, EM).
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'$do_suspy'(S, F, N, T, M) :-
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'$undefined'(T,M), !,
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( S = spy ->
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print_message(warning,no_match(spy(M:F/N)))
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;
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print_message(warning,no_match(nospy(M:F/N)))
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).
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'$do_suspy'(S, F, N, T, M) :-
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'$system_predicate'(T,M),
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'$predicate_flags'(T,M,F,F),
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F /\ 0x118dd080 =\= 0,
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( S = spy ->
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'$do_error'(permission_error(access,private_procedure,T),spy(M:F/N))
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;
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'$do_error'(permission_error(access,private_procedure,T),nospy(M:F/N))
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).
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'$do_suspy'(S, F, N, T, M) :-
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'$undefined'(T,M), !,
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( S = spy ->
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print_message(warning,no_match(spy(M:F/N)))
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;
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print_message(warning,no_match(nospy(M:F/N)))
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).
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'$do_suspy'(S,F,N,T,M) :-
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'$suspy2'(S,F,N,T,M).
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'$suspy2'(spy,F,N,T,M) :-
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recorded('$spy','$spy'(T,M),_), !,
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print_message(informational,breakp(bp(debugger,plain,M:T,M:F/N,N),add,already)).
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'$suspy2'(spy,F,N,T,M) :- !,
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recorda('$spy','$spy'(T,M),_),
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'$set_spy'(T,M),
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print_message(informational,breakp(bp(debugger,plain,M:T,M:F/N,N),add,ok)).
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'$suspy2'(nospy,F,N,T,M) :-
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recorded('$spy','$spy'(T,M),R), !,
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erase(R),
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'$rm_spy'(T,M),
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print_message(informational,breakp(bp(debugger,plain,M:T,M:F/N,N),remove,last)).
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'$suspy2'(nospy,F,N,_,M) :-
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print_message(informational,breakp(no,breakpoint_for,M:F/N)).
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'$pred_being_spied'(G, M) :-
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recorded('$spy','$spy'(G,M),_), !.
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/**
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@pred spy( + _P_ ).
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Sets spy-points on all the predicates represented by
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_P_. _P_ can either be a single specification or a list of
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specifications. Each one must be of the form _Name/Arity_
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or _Name_. In the last case all predicates with the name
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_Name_ will be spied. As in C-Prolog, system predicates and
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predicates written in C, cannot be spied.
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*/
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spy Spec :-
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'$init_debugger',
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prolog:debug_action_hook(spy(Spec)), !.
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spy L :-
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'$current_module'(M),
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'$suspy'(L, spy, M), fail.
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spy _ :- debug.
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/** @pred nospy( + _P_ )
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Removes spy-points from all predicates specified by _P_.
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The possible forms for _P_ are the same as in `spy P`.
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*/
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nospy Spec :-
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'$init_debugger',
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prolog:debug_action_hook(nospy(Spec)), !.
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nospy L :-
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'$current_module'(M),
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'$suspy'(L, nospy, M), fail.
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nospy _.
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/** @pred nospyall
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Removes all existing spy-points.
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*/
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nospyall :-
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'$init_debugger',
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prolog:debug_action_hook(nospyall), !.
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nospyall :-
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recorded('$spy','$spy'(T,M),_), functor(T,F,N), '$suspy'(F/N,nospy,M), fail.
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nospyall.
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% debug mode -> debug flag = 1
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debug :-
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'$init_debugger',
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( '__NB_getval__'('$spy_gn',_, fail) -> true ; '__NB_setval__'('$spy_gn',1) ),
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'$start_debugging'(on),
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print_message(informational,debug(debug)).
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'$start_debugging'(Mode) :-
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(Mode == on ->
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set_prolog_flag(debug, true)
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;
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set_prolog_flag(debug, false)
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),
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'__NB_setval__'('$debug_run',off),
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'__NB_setval__'('$debug_jump',false).
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nodebug :-
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'$init_debugger',
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set_prolog_flag(debug, false),
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'__NB_setval__'('$trace',off),
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print_message(informational,debug(off)).
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%
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% remove any debugging info after an abort.
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%
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/** @pred trace
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Switches on the debugger and enters tracing mode.
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*/
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trace :-
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'$init_debugger',
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'__NB_getval__'('$trace', on, fail), !.
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trace :-
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'__NB_setval__'('$trace',on),
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'$start_debugging'(on),
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print_message(informational,debug(trace)),
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'$creep'.
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/** @pred notrace
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Ends tracing and exits the debugger. This is the same as
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nodebug/0.
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*/
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notrace :-
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'$init_debugger',
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nodebug.
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/*-----------------------------------------------------------------------------
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leash
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-----------------------------------------------------------------------------*/
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/** @pred leash(+ _M_)
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Sets leashing mode to _M_.
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The mode can be specified as:
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+ `full`
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prompt on Call, Exit, Redo and Fail
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+ `tight`
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prompt on Call, Redo and Fail
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+ `half`
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prompt on Call and Redo
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+ `loose`
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prompt on Call
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+ `off`
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never prompt
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+ `none`
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never prompt, same as `off`
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The initial leashing mode is `full`.
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The user may also specify directly the debugger ports
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where he wants to be prompted. If the argument for leash
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is a number _N_, each of lower four bits of the number is used to
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control prompting at one the ports of the box model. The debugger will
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prompt according to the following conditions:
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+ if `N/\ 1 =\= 0` prompt on fail
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+ if `N/\ 2 =\= 0` prompt on redo
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+ if `N/\ 4 =\= 0` prompt on exit
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+ if `N/\ 8 =\= 0` prompt on call
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Therefore, `leash(15)` is equivalent to `leash(full)` and
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`leash(0)` is equivalent to `leash(off)`.
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Another way of using `leash` is to give it a list with the names of
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the ports where the debugger should stop. For example,
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`leash([call,exit,redo,fail])` is the same as `leash(full)` or
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`leash(15)` and `leash([fail])` might be used instead of
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`leash(1)`.
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@}
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*/
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leash(X) :- var(X),
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'$do_error'(instantiation_error,leash(X)).
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leash(X) :-
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'$init_debugger',
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'$leashcode'(X,Code),
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set_value('$leash',Code),
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'$show_leash'(informational,Code), !.
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leash(X) :-
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'$do_error'(type_error(leash_mode,X),leash(X)).
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'$show_leash'(Msg,0) :-
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print_message(Msg,leash([])).
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'$show_leash'(Msg,Code) :-
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'$check_leash_bit'(Code,0x8,L3,call,LF),
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'$check_leash_bit'(Code,0x4,L2,exit,L3),
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'$check_leash_bit'(Code,0x2,L1,redo,L2),
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'$check_leash_bit'(Code,0x1,[],fail,L1),
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print_message(Msg,leash(LF)).
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'$check_leash_bit'(Code,Bit,L0,_,L0) :- Bit /\ Code =:= 0, !.
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'$check_leash_bit'(_,_,L0,Name,[Name|L0]).
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'$leashcode'(full,0xf) :- !.
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'$leashcode'(on,0xf) :- !.
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'$leashcode'(half,0xb) :- !.
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'$leashcode'(loose,0x8) :- !.
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'$leashcode'(off,0x0) :- !.
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'$leashcode'(none,0x0) :- !.
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%'$leashcode'([L|M],Code) :- !, '$leashcode_list'([L|M],Code).
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'$leashcode'([L|M],Code) :- !,
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'$list2Code'([L|M],Code).
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'$leashcode'(N,N) :- integer(N), N >= 0, N =< 0xf.
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'$list2Code'(V,_) :- var(V), !,
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'$do_error'(instantiation_error,leash(V)).
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'$list2Code'([],0) :- !.
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'$list2Code'([V|L],_) :- var(V), !,
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'$do_error'(instantiation_error,leash([V|L])).
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'$list2Code'([call|L],N) :- '$list2Code'(L,N1), N is 0x8 + N1.
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'$list2Code'([exit|L],N) :- '$list2Code'(L,N1), N is 0x4 + N1.
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'$list2Code'([redo|L],N) :- '$list2Code'(L,N1), N is 0x2 + N1.
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'$list2Code'([fail|L],N) :- '$list2Code'(L,N1), N is 0x1 + N1.
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/*-----------------------------------------------------------------------------
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debugging
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-----------------------------------------------------------------------------*/
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debugging :-
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'$init_debugger',
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prolog:debug_action_hook(nospyall), !.
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debugging :-
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( current_prolog_flag(debug, true) ->
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print_message(help,debug(debug))
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;
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print_message(help,debug(off))
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),
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findall(M:(N/A),(recorded('$spy','$spy'(T,M),_),functor(T,N,A)),L),
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print_message(help,breakpoints(L)),
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get_value('$leash',Leash),
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'$show_leash'(help,Leash).
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/*
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@}
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*/
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