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yap-6.3/LGPL/chr/chr_runtime.pl
vsc 4d94446c25 port of LGPLed CHR 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1416 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2005-10-28 17:41:30 +00:00

751 lines
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Prolog
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/* $Id: chr_runtime.pl,v 1.1 2005-10-28 17:41:30 vsc Exp $
Part of CHR (Constraint Handling Rules)
Author: Christian Holzbaur and Tom Schrijvers
E-mail: christian@ai.univie.ac.at
Tom.Schrijvers@cs.kuleuven.ac.be
WWW: http://www.swi-prolog.org
Copyright (C): 2003-2004, K.U. Leuven
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
Distributed with SWI-Prolog under the above conditions with
permission from the authors.
*/
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% _ _ _
%% ___| |__ _ __ _ __ _ _ _ __ | |_(_)_ __ ___ ___
%% / __| '_ \| '__| | '__| | | | '_ \| __| | '_ ` _ \ / _ \
%% | (__| | | | | | | | |_| | | | | |_| | | | | | | __/
%% \___|_| |_|_| |_| \__,_|_| |_|\__|_|_| |_| |_|\___|
%%
%% hProlog CHR runtime:
%%
%% * based on the SICStus CHR runtime by Christian Holzbaur
%%
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% % Constraint Handling Rules version 2.2 %
%% % %
%% % (c) Copyright 1996-98 %
%% % LMU, Muenchen %
%% % %
%% % File: chr.pl %
%% % Author: Christian Holzbaur christian@ai.univie.ac.at %
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%%
%% * modified by Tom Schrijvers, K.U.Leuven, Tom.Schrijvers@cs.kuleuven.ac.be
%% - ported to hProlog
%% - modified for eager suspension removal
%%
%% * First working version: 6 June 2003
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% SWI-Prolog changes
%%
%% * Added initialization directives for saved-states
%% * Renamed merge/3 --> sbag_merge/3 (name conflict)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- module(chr_runtime,
[ 'chr sbag_del_element'/3,
'chr sbag_member'/2,
'chr merge_attributes'/3,
'chr run_suspensions'/1,
'chr run_suspensions_loop'/1,
'chr run_suspensions_d'/1,
'chr run_suspensions_loop_d'/1,
'chr insert_constraint_internal'/5,
'chr remove_constraint_internal'/2,
'chr allocate_constraint'/4,
'chr activate_constraint'/3,
'chr global_term_ref_1'/1,
'chr via_1'/2,
'chr via_2'/3,
'chr via'/2,
'chr lock'/1,
'chr unlock'/1,
'chr not_locked'/1,
'chr none_locked'/1,
'chr update_mutable'/2,
'chr get_mutable'/2,
'chr novel_production'/2,
'chr extend_history'/2,
'chr empty_history'/1,
'chr gen_id'/1,
'chr debug_event'/1,
'chr debug command'/2, % Char, Command
'chr chr_indexed_variables'/2,
chr_trace/0,
chr_notrace/0,
chr_leash/1
]).
:- set_prolog_flag(generate_debug_info, false).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- use_module(library(assoc)).
:- use_module(hprolog).
%:- use_module(library(lists)).
:- include(chr_op).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% I N I T I A L I S A T I O N
chr_init :-
nb_setval(id,0),
nb_setval(chr_global,_),
nb_setval(chr_debug,mutable(off)),
nb_setval(chr_debug_history,mutable([],0)).
:- initialization chr_init.
show_store(Mod) :-
(
Mod:'$enumerate_suspensions'(Susp),
arg(6,Susp,C),
writeln(C),
fail
;
true
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr merge_attributes'( As, Bs, Cs) :-
sbag_union(As,Bs,Cs).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr run_suspensions'( Slots) :-
run_suspensions( Slots).
'chr run_suspensions_loop'([]).
'chr run_suspensions_loop'([L|Ls]) :-
run_suspensions(L),
'chr run_suspensions_loop'(Ls).
run_suspensions([]).
run_suspensions([S|Next] ) :-
arg( 2, S, Mref),
Mref = mutable(Status), % get_mutable( Status, Mref), % XXX Inlined
( Status==active ->
update_mutable( triggered, Mref),
arg( 4, S, Gref),
Gref = mutable(Gen), % get_mutable( Gen, Gref), % XXX Inlined
Generation is Gen+1,
update_mutable( Generation, Gref),
arg( 3, S, Goal),
call( Goal),
% get_mutable( Post, Mref), % XXX Inlined
( Mref = mutable(triggered) -> % Post==triggered ->
update_mutable( removed, Mref)
;
true
)
;
true
),
run_suspensions( Next).
'chr run_suspensions_d'( Slots) :-
run_suspensions_d( Slots).
'chr run_suspensions_loop_d'([]).
'chr run_suspensions_loop_d'([L|Ls]) :-
run_suspensions_d(L),
'chr run_suspensions_loop_d'(Ls).
run_suspensions_d([]).
run_suspensions_d([S|Next] ) :-
arg( 2, S, Mref),
Mref = mutable(Status), % get_mutable( Status, Mref), % XXX Inlined
( Status==active ->
update_mutable( triggered, Mref),
arg( 4, S, Gref),
Gref = mutable(Gen), % get_mutable( Gen, Gref), % XXX Inlined
Generation is Gen+1,
update_mutable( Generation, Gref),
arg( 3, S, Goal),
(
'chr debug_event'(wake(S)),
call( Goal)
;
'chr debug_event'(fail(S)), !,
fail
),
(
'chr debug_event'(exit(S))
;
'chr debug_event'(redo(S)),
fail
),
% get_mutable( Post, Mref), % XXX Inlined
( Mref = mutable(triggered) -> % Post==triggered ->
update_mutable( removed, Mref)
;
true
)
;
true
),
run_suspensions_d( Next).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
locked:attr_unify_hook(_,_) :- fail.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr lock'(T) :-
lock(T).
'chr unlock'(T) :-
unlock(T).
'chr not_locked'(T) :-
not_locked(T).
lock(T) :-
( var(T)
-> put_attr(T, locked, x)
; term_variables(T,L),
lockv(L)
).
lockv([]).
lockv([T|R]) :- put_attr( T, locked, x), lockv(R).
unlock(T) :-
( var(T)
-> del_attr(T, locked)
; term_variables(T,L),
unlockv(L)
).
unlockv([]).
unlockv([T|R]) :- del_attr( T, locked), unlockv(R).
'chr none_locked'( []).
'chr none_locked'( [V|Vs]) :-
not_locked( V),
'chr none_locked'( Vs).
not_locked( V) :-
( var( V) ->
( get_attr( V, locked, _) ->
fail
;
true
)
;
true
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Eager removal from all chains.
%
'chr remove_constraint_internal'( Susp, Agenda) :-
arg( 2, Susp, Mref),
Mref = mutable(State), % get_mutable( State, Mref), % XXX Inlined
update_mutable( removed, Mref), % mark in any case
( compound(State) -> % passive/1
Agenda = []
; State==removed ->
Agenda = []
%; State==triggered ->
% Agenda = []
;
Susp =.. [_,_,_,_,_,_,_|Args],
term_variables( Args, Vars),
global_term_ref_1( Global),
Agenda = [Global|Vars]
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr via_1'(X,V) :-
( var(X) ->
X = V
; atomic(X) ->
global_term_ref_1(V)
; nonground(X,V) ->
true
;
global_term_ref_1(V)
).
% 'chr via_1'( X, V) :- var(X), !, X=V.
% 'chr via_1'( T, V) :- compound(T), nonground( T, V), ! .
% 'chr via_1'( _, V) :- global_term_ref_1( V).
'chr via_2'(X,Y,V) :-
( var(X) ->
X = V
; var(Y) ->
Y = V
; compound(X), nonground(X,V) ->
true
; compound(Y), nonground(Y,V) ->
true
;
global_term_ref_1(V)
).
% 'chr via_2'( X, _, V) :- var(X), !, X=V.
% 'chr via_2'( _, Y, V) :- var(Y), !, Y=V.
% 'chr via_2'( T, _, V) :- compound(T), nonground( T, V), ! .
% 'chr via_2'( _, T, V) :- compound(T), nonground( T, V), ! .
% 'chr via_2'( _, _, V) :- global_term_ref_1( V).
%
% The second arg is a witness.
% The formulation with term_variables/2 is
% cycle safe, but it finds a list of all vars.
% We need only one, and no list in particular.
%
'chr via'(L,V) :-
( nonground(L,V) ->
true
;
global_term_ref_1(V)
).
nonground( Term, V) :-
term_variables( Term, Vs),
Vs = [V|_].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr novel_production'( Self, Tuple) :-
arg( 5, Self, Ref),
Ref = mutable(History), % get_mutable( History, Ref), % XXX Inlined
( get_assoc( Tuple, History, _) ->
fail
;
true
).
%
% Not folded with novel_production/2 because guard checking
% goes in between the two calls.
%
'chr extend_history'( Self, Tuple) :-
arg( 5, Self, Ref),
Ref = mutable(History), % get_mutable( History, Ref), % XXX Inlined
put_assoc( Tuple, History, x, NewHistory),
update_mutable( NewHistory, Ref).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
constraint_generation( Susp, State, Generation) :-
arg( 2, Susp, Mref),
Mref = mutable(State), % get_mutable( State, Mref), % XXX Inlined
arg( 4, Susp, Gref),
Gref = mutable(Generation). % get_mutable( Generation, Gref). % not incremented meanwhile % XXX Inlined
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr allocate_constraint'( Closure, Self, F, Args) :-
'chr empty_history'( History),
create_mutable( passive(Args), Mref),
create_mutable( 0, Gref),
create_mutable( History, Href),
'chr gen_id'( Id),
Self =.. [suspension,Id,Mref,Closure,Gref,Href,F|Args].
%
% 'chr activate_constraint'( -, +, -).
%
% The transition gc->active should be rare
%
'chr activate_constraint'( Vars, Susp, Generation) :-
arg( 2, Susp, Mref),
Mref = mutable(State), % get_mutable( State, Mref), % XXX Inlined
update_mutable( active, Mref),
( nonvar(Generation) -> % aih
true
;
arg( 4, Susp, Gref),
Gref = mutable(Gen), % get_mutable( Gen, Gref), % XXX Inlined
Generation is Gen+1,
update_mutable( Generation, Gref)
),
( compound(State) -> % passive/1
term_variables( State, Vs),
'chr none_locked'( Vs),
global_term_ref_1( Global),
Vars = [Global|Vs]
; State==removed -> % the price for eager removal ...
Susp =.. [_,_,_,_,_,_,_|Args],
term_variables( Args, Vs),
global_term_ref_1( Global),
Vars = [Global|Vs]
;
Vars = []
).
'chr insert_constraint_internal'( [Global|Vars], Self, Closure, F, Args) :-
term_variables( Args, Vars),
'chr none_locked'( Vars),
global_term_ref_1( Global),
'chr empty_history'( History),
create_mutable( active, Mref),
create_mutable( 0, Gref),
create_mutable( History, Href),
'chr gen_id'( Id),
Self =.. [suspension,Id,Mref,Closure,Gref,Href,F|Args].
insert_constraint_internal( [Global|Vars], Self, Term, Closure, F, Args) :-
term_variables( Term, Vars),
'chr none_locked'( Vars),
global_term_ref_1( Global),
'chr empty_history'( History),
create_mutable( active, Mref),
create_mutable( 0, Gref),
create_mutable( History, Href),
'chr gen_id'( Id),
Self =.. [suspension,Id,Mref,Closure,Gref,Href,F|Args].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
change_state( Susp, State) :-
arg( 2, Susp, Mref),
update_mutable( State, Mref).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr empty_history'( E) :- empty_assoc( E).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr gen_id'( Id) :-
incval( id, Id).
incval(id,Id) :-
nb_getval(id,Id),
NextId is Id + 1,
nb_setval(id,NextId).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
create_mutable(V,mutable(V)).
'chr get_mutable'(V, mutable(V)).
'chr update_mutable'(V,M) :-
setarg(1,M,V).
get_mutable(V, mutable(V)).
update_mutable(V,M) :-
setarg(1,M,V).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr global_term_ref_1'(X) :-
global_term_ref_1(X).
global_term_ref_1(X) :-
nb_getval(chr_global,X).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
'chr sbag_member'( Element, [Head|Tail]) :-
sbag_member( Element, Tail, Head).
% auxiliary to avoid choicepoint for last element
sbag_member( E, _, E).
sbag_member( E, [Head|Tail], _) :-
sbag_member( E, Tail, Head).
'chr sbag_del_element'( [], _, []).
'chr sbag_del_element'( [X|Xs], Elem, Set2) :-
( X==Elem ->
Set2 = Xs
;
Set2 = [X|Xss],
'chr sbag_del_element'( Xs, Elem, Xss)
).
sbag_union( A, B, C) :-
sbag_merge( A, B, C).
sbag_merge([],Ys,Ys).
sbag_merge([X | Xs],YL,R) :-
( YL = [Y | Ys] ->
arg(1,X,XId),
arg(1,Y,YId),
( XId < YId ->
R = [X | T],
sbag_merge(Xs,YL,T)
; XId > YId ->
R = [Y | T],
sbag_merge([X|Xs],Ys,T)
;
R = [X | T],
sbag_merge(Xs,Ys,T)
)
;
R = [X | Xs]
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- multifile
chr:debug_event/2, % +State, +Event
chr:debug_interact/3. % +Event, +Depth, -Command
'chr debug_event'(Event) :-
nb_getval(chr_debug,mutable(State)),
( State == off ->
true
; chr:debug_event(State, Event) ->
true
; debug_event(State,Event)
).
chr_trace :-
nb_setval(chr_debug,mutable(trace)).
chr_notrace :-
nb_setval(chr_debug,mutable(off)).
% chr_leash(+Spec)
%
% Define the set of ports at which we prompt for user interaction
chr_leash(Spec) :-
leashed_ports(Spec, Ports),
nb_setval(chr_leash,mutable(Ports)).
leashed_ports(none, []).
leashed_ports(off, []).
leashed_ports(all, [call, exit, redo, fail, wake, try, apply, insert, remove]).
leashed_ports(default, [call,exit,fail,wake,apply]).
leashed_ports(One, Ports) :-
atom(One), One \== [], !,
leashed_ports([One], Ports).
leashed_ports(Set, Ports) :-
sort(Set, Ports), % make unique
leashed_ports(all, All),
valid_ports(Ports, All).
valid_ports([], _).
valid_ports([H|T], Valid) :-
( memberchk(H, Valid)
-> true
; throw(error(domain_error(chr_port, H), _))
),
valid_ports(T, Valid).
:- initialization
leashed_ports(default, Ports),
nb_setval(chr_leash, mutable(Ports)).
% debug_event(+State, +Event)
%debug_event(trace, Event) :-
% functor(Event, Name, Arity),
% writeln(Name/Arity), fail.
debug_event(trace,Event) :-
Event = call(_), !,
get_debug_history(History,Depth),
NDepth is Depth + 1,
chr_debug_interact(Event,NDepth),
set_debug_history([Event|History],NDepth).
debug_event(trace,Event) :-
Event = wake(_), !,
get_debug_history(History,Depth),
NDepth is Depth + 1,
chr_debug_interact(Event,NDepth),
set_debug_history([Event|History],NDepth).
debug_event(trace,Event) :-
Event = redo(_), !,
get_debug_history(_History, Depth),
chr_debug_interact(Event, Depth).
debug_event(trace,Event) :-
Event = exit(_),!,
get_debug_history([_|History],Depth),
chr_debug_interact(Event,Depth),
NDepth is Depth - 1,
set_debug_history(History,NDepth).
debug_event(trace,Event) :-
Event = fail(_),!,
get_debug_history(_,Depth),
chr_debug_interact(Event,Depth).
debug_event(trace, Event) :-
Event = remove(_), !,
get_debug_history(_,Depth),
chr_debug_interact(Event, Depth).
debug_event(trace, Event) :-
Event = insert(_), !,
get_debug_history(_,Depth),
chr_debug_interact(Event, Depth).
debug_event(trace, Event) :-
Event = try(_,_,_,_), !,
get_debug_history(_,Depth),
chr_debug_interact(Event, Depth).
debug_event(trace, Event) :-
Event = apply(_,_,_,_), !,
get_debug_history(_,Depth),
chr_debug_interact(Event,Depth).
debug_event(skip(_,_),Event) :-
Event = call(_), !,
get_debug_history(History,Depth),
NDepth is Depth + 1,
set_debug_history([Event|History],NDepth).
debug_event(skip(_,_),Event) :-
Event = wake(_), !,
get_debug_history(History,Depth),
NDepth is Depth + 1,
set_debug_history([Event|History],NDepth).
debug_event(skip(SkipSusp,SkipDepth),Event) :-
Event = exit(Susp),!,
get_debug_history([_|History],Depth),
( SkipDepth == Depth,
SkipSusp == Susp ->
set_chr_debug(trace),
chr_debug_interact(Event,Depth)
;
true
),
NDepth is Depth - 1,
set_debug_history(History,NDepth).
debug_event(skip(_,_),_) :- !,
true.
% chr_debug_interact(+Event, +Depth)
%
% Interact with the user on Event that took place at Depth. First
% calls chr:debug_interact(+Event, +Depth, -Command) hook. If this
% fails the event is printed and the system prompts for a command.
chr_debug_interact(Event, Depth) :-
chr:debug_interact(Event, Depth, Command), !,
handle_debug_command(Command,Event,Depth).
chr_debug_interact(Event, Depth) :-
print_event(Event, Depth),
( leashed(Event)
-> ask_continue(Command)
; Command = creep
),
handle_debug_command(Command,Event,Depth).
leashed(Event) :-
functor(Event, Port, _),
nb_getval(chr_leash, mutable(Ports)),
memberchk(Port, Ports).
ask_continue(Command) :-
print_message(debug, chr(prompt)),
get_single_char(CharCode),
( CharCode == -1
-> Char = end_of_file
; char_code(Char, CharCode)
),
( debug_command(Char, Command)
-> print_message(debug, chr(command(Command)))
; print_message(help, chr(invalid_command)),
ask_continue(Command)
).
'chr debug command'(Char, Command) :-
debug_command(Char, Command).
debug_command(c, creep).
debug_command(' ', creep).
debug_command('\r', creep).
debug_command(s, skip).
debug_command(g, ancestors).
debug_command(n, nodebug).
debug_command(a, abort).
debug_command(f, fail).
debug_command(b, break).
debug_command(?, help).
debug_command(h, help).
debug_command(end_of_file, exit).
handle_debug_command(creep,_,_) :- !.
handle_debug_command(skip, Event, Depth) :- !,
Event =.. [Type|Rest],
( Type \== call,
Type \== wake ->
handle_debug_command('c',Event,Depth)
;
Rest = [Susp],
set_chr_debug(skip(Susp,Depth))
).
handle_debug_command(ancestors,Event,Depth) :- !,
print_chr_debug_history,
chr_debug_interact(Event,Depth).
handle_debug_command(nodebug,_,_) :- !,
chr_notrace.
handle_debug_command(abort,_,_) :- !,
abort.
handle_debug_command(exit,_,_) :- !,
halt.
handle_debug_command(fail,_,_) :- !,
fail.
handle_debug_command(break,Event,Depth) :- !,
break,
chr_debug_interact(Event,Depth).
handle_debug_command(help,Event,Depth) :- !,
print_message(help, chr(debug_options)),
chr_debug_interact(Event,Depth).
handle_debug_command(Cmd, _, _) :-
throw(error(domain_error(chr_debug_command, Cmd), _)).
print_chr_debug_history :-
get_debug_history(History,Depth),
print_message(debug, chr(ancestors(History, Depth))).
print_event(Event, Depth) :-
print_message(debug, chr(event(Event, Depth))).
% {set,get}_debug_history(Ancestors, Depth)
%
% Set/get the list of ancestors and the depth of the current goal.
get_debug_history(History,Depth) :-
nb_getval(chr_debug_history,mutable(History,Depth)).
set_debug_history(History,Depth) :-
nb_getval(chr_debug_history,Mutable),
setarg(1,Mutable,History),
setarg(2,Mutable,Depth).
set_chr_debug(State) :-
nb_getval(chr_debug,Mutable),
setarg(1,Mutable,State).
'chr chr_indexed_variables'(Susp,Vars) :-
Susp =.. [_,_,_,_,_,_,_|Args],
term_variables(Args,Vars).
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