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yap-6.3/LGPL/chr/chr_translate.chr
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

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/* $Id: chr_translate.chr,v 1.1 2005-10-28 17:41:30 vsc Exp $
Part of CHR (Constraint Handling Rules)
Author: Tom Schrijvers
E-mail: 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.
*/
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% ____ _ _ ____ ____ _ _
%% / ___| | | | _ \ / ___|___ _ __ ___ _ __ (_) | ___ _ __
%% | | | |_| | |_) | | | / _ \| '_ ` _ \| '_ \| | |/ _ \ '__|
%% | |___| _ | _ < | |__| (_) | | | | | | |_) | | | __/ |
%% \____|_| |_|_| \_\ \____\___/|_| |_| |_| .__/|_|_|\___|_|
%% |_|
%%
%% hProlog CHR compiler:
%%
%% * by Tom Schrijvers, K.U. Leuven, Tom.Schrijvers@cs.kuleuven.ac.be
%%
%% * based on the SICStus CHR compilation by Christian Holzbaur
%%
%% First working version: 6 June 2003
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% URGENTLY TODO
%%
%% * add groundness info to a.i.-based observation analysis
%% * proper fd/index analysis
%% * re-add generation checking
%% * untangle CHR-level and traget source-level generation & optimization
%%
%% AGGRESSIVE OPTIMISATION IDEAS
%%
%% * continuation optimization
%% * analyze history usage to determine whether/when
%% cheaper suspension is possible
%% * store constraint unconditionally for unconditional propagation rule,
%% if first, i.e. without checking history and set trigger cont to next occ
%% * get rid of suspension passing for never triggered constraints,
%% up to allocation occurrence
%% * get rid of call indirection for never triggered constraints
%% up to first allocation occurrence.
%% * get rid of unnecessary indirection if last active occurrence
%% before unconditional removal is head2, e.g.
%% a \ b <=> true.
%% a <=> true.
%% * Eliminate last clause of never stored constraint, if its body
%% is fail.
%% * Specialize lookup operations and indexes for functional dependencies.
%%
%% MORE TODO
%%
%% * ground matching seems to be not optimized for compound terms
%% in case of simpagation_head2 and propagation occurrences
%% * Do not unnecessarily generate store operations.
%% * further specialize runtime predicates for special cases where
%% - none of the constraints contain any indexing variables, ...
%% - just one constraint requires some runtime predicate
%% * analysis for storage delaying (see primes for case)
%% * internal constraints declaration + analyses?
%% * Do not store in global variable store if not necessary
%% NOTE: affects show_store/1
%% * multi-level store: variable - ground
%% * Do not maintain/check unnecessary propagation history
%% for rules that cannot be applied more than once
%% for reasons of anti-monotony
%% * Strengthen storage analysis for propagation rules
%% reason about bodies of rules only containing constraints
%% -> fixpoint with overservation analysis
%% * SICStus compatibility
%% - options
%% - pragmas
%% - tell guard
%% * instantiation declarations
%% POTENTIAL GAIN:
%% VARIABLE (never bound)
%%
%% * make difference between cheap guards for reordering
%% and non-binding guards for lock removal
%% * unqiue -> once/[] transformation for propagation
%% * cheap guards interleaved with head retrieval + faster
%% via-retrieval + non-empty checking for propagation rules
%% redo for simpagation_head2 prelude
%% * intelligent backtracking for simplification/simpagation rule
%% generator_1(X),'_$savecp'(CP_1),
%% ...
%% if( (
%% generator_n(Y),
%% test(X,Y)
%% ),
%% true,
%% ('_$cutto'(CP_1), fail)
%% ),
%% ...
%%
%% or recently developped cascading-supported approach
%% * intelligent backtracking for propagation rule
%% use additional boolean argument for each possible smart backtracking
%% when boolean at end of list true -> no smart backtracking
%% false -> smart backtracking
%% only works for rules with at least 3 constraints in the head
%% * (set semantics + functional dependency) declaration + resolution
%%
%%
%% * identify cases where prefixes of partner lookups for subsequent occurrences can be
%% merged
%%
%% * map A \ B <=> true | true rules
%% onto efficient code that empties the constraint stores of B
%% in O(1) time for ground constraints where A and B do not share
%% any variables
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- module(chr_translate,
[ chr_translate/2 % +Decls, -TranslatedDecls
]).
:- use_module(library(lists)).
:- use_module(hprolog).
:- use_module(library(assoc)).
:- use_module(pairlist).
:- use_module(library(ordsets)).
:- use_module(a_star).
:- use_module(listmap).
:- use_module(clean_code).
:- use_module(builtins).
:- use_module(find).
:- use_module(guard_entailment).
:- use_module(chr_compiler_options).
:- use_module(chr_compiler_utility).
:- include(chr_op).
:- op(1150, fx, chr_type).
:- op(1130, xfx, --->).
:- op(1150, fx, (+)).
:- op(1150, fx, (-)).
:- op(1150, fx, (?)).
option(debug,off).
option(optimize,full).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- constraints
target_module/1, % target_module(Module)
get_target_module/1,
indexed_argument/2, % argument instantiation may enable applicability of rule
is_indexed_argument/2,
constraint_mode/2,
get_constraint_mode/2,
may_trigger/1,
store_type/2,
get_store_type/2,
update_store_type/2,
actual_store_types/2,
assumed_store_type/2,
validate_store_type_assumption/1,
rule_count/1,
inc_rule_count/1,
passive/2,
is_passive/2,
any_passive_head/1,
new_occurrence/3,
occurrence/4,
get_occurrence/4,
max_occurrence/2,
get_max_occurrence/2,
allocation_occurrence/2,
get_allocation_occurrence/2,
rule/2,
get_rule/2,
least_occurrence/2,
is_least_occurrence/1
.
option(check_guard_bindings,off).
option(mode,target_module(+)).
option(mode,indexed_argument(+,+)).
option(mode,constraint_mode(+,+)).
option(mode,may_trigger(+)).
option(mode,store_type(+,+)).
option(mode,actual_store_types(+,+)).
option(mode,assumed_store_type(+,+)).
option(mode,rule_count(+)).
option(mode,passive(+,+)).
option(mode,occurrence(+,+,+,+)).
option(mode,max_occurrence(+,+)).
option(mode,allocation_occurrence(+,+)).
option(mode,rule(+,+)).
option(mode,least_occurrence(+,+)).
option(mode,is_least_occurrence(+)).
option(type_definition,type(list,[ [], [any|list] ])).
option(type_definition,type(constraint,[ any / any ])).
option(type_declaration,constraint_mode(constraint,list)).
target_module(_) \ target_module(_) <=> true.
target_module(Mod) \ get_target_module(Query)
<=> Query = Mod .
get_target_module(Query)
<=> Query = user.
indexed_argument(FA,I) \ indexed_argument(FA,I) <=> true.
indexed_argument(FA,I) \ is_indexed_argument(FA,I) <=> true.
is_indexed_argument(_,_) <=> fail.
%%% C O N S T R A I N T M O D E %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
constraint_mode(FA,_) \ constraint_mode(FA,_) <=> true.
constraint_mode(FA,Mode) \ get_constraint_mode(FA,Q) <=>
Q = Mode.
get_constraint_mode(FA,Q) <=>
FA = _ / N,
replicate(N,(?),Q).
%%% M A Y T R I G G E R %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
constraint_mode(FA,Mode), indexed_argument(FA,I) \ may_trigger(FA) <=>
nth(I,Mode,M),
M \== (+) |
is_stored(FA).
may_trigger(FA) <=> chr_pp_flag(debugable,on). % in debug mode, we assume everything can be triggered
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
store_type(FA,atom_hash(Index)) <=> store_type(FA,multi_hash([Index])).
store_type(FA,Store) \ get_store_type(FA,Query)
<=> Query = Store.
assumed_store_type(FA,Store) \ get_store_type(FA,Query)
<=> Query = Store.
get_store_type(_,Query)
<=> Query = default.
actual_store_types(C,STs) \ update_store_type(C,ST)
<=> member(ST,STs) | true.
update_store_type(C,ST), actual_store_types(C,STs)
<=>
actual_store_types(C,[ST|STs]).
update_store_type(C,ST)
<=>
actual_store_types(C,[ST]).
% refine store type assumption
validate_store_type_assumption(C), actual_store_types(C,STs), assumed_store_type(C,_) % automatic assumption
<=>
store_type(C,multi_store(STs)).
validate_store_type_assumption(C), actual_store_types(C,STs), store_type(C,_) % user assumption
<=>
store_type(C,multi_store(STs)).
validate_store_type_assumption(_)
<=> true.
rule_count(C), inc_rule_count(NC)
<=> NC is C + 1, rule_count(NC).
inc_rule_count(NC)
<=> NC = 1, rule_count(NC).
%%% P A S S I V E %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
passive(R,ID) \ passive(R,ID) <=> true.
passive(RuleNb,ID) \ is_passive(RuleNb,ID) <=> true.
is_passive(_,_) <=> fail.
passive(RuleNb,_) \ any_passive_head(RuleNb)
<=> true.
any_passive_head(_)
<=> fail.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
max_occurrence(C,N) \ max_occurrence(C,M)
<=> N >= M | true.
max_occurrence(C,MO), new_occurrence(C,RuleNb,ID) <=>
NO is MO + 1,
occurrence(C,NO,RuleNb,ID),
max_occurrence(C,NO).
new_occurrence(C,RuleNb,ID) <=>
format('ERROR: new_occurrence: missing max_occurrence for ~w in rule ~w\n',[C,RuleNb]),
fail.
max_occurrence(C,MON) \ get_max_occurrence(C,Q)
<=> Q = MON.
get_max_occurrence(C,Q)
<=> format('WARNING: get_max_occurrence: missing max occurrence for ~w\n',[C]), Q = 0.
occurrence(C,ON,Rule,ID) \ get_occurrence(C,ON,QRule,QID)
<=> Rule = QRule, ID = QID.
get_occurrence(C,O,_,_)
<=> format('get_occurrence: missing occurrence ~w:~w\n',[C,O]), fail.
% A L L O C C A T I O N O C C U R R E N C E %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% cannot store constraint at passive occurrence
occurrence(C,O,RuleNb,ID), passive(RuleNb,ID) \ allocation_occurrence(C,O)
<=> NO is O + 1, allocation_occurrence(C,NO).
% need not store constraint that is removed
rule(RuleNb,Rule), occurrence(C,O,RuleNb,ID) \ allocation_occurrence(C,O)
<=> Rule = pragma(_,ids(IDs1,_),_,_,_), member(ID,IDs1)
| NO is O + 1, allocation_occurrence(C,NO).
% need not store constraint when body is true
rule(RuleNb,Rule), occurrence(C,O,RuleNb,_) \ allocation_occurrence(C,O)
<=> Rule = pragma(rule([_|_],_,_,true),_,_,_,_)
| NO is O + 1, allocation_occurrence(C,NO).
% need not store constraint if does not observe itself
rule(RuleNb,Rule), occurrence(C,O,RuleNb,_) \ allocation_occurrence(C,O)
<=> Rule = pragma(rule([_|_],_,_,_),_,_,_,_), \+ is_observed(C,O)
| NO is O + 1, allocation_occurrence(C,NO).
% need not store constraint if does not observe itself and cannot trigger
rule(RuleNb,Rule), occurrence(C,O,RuleNb,_), least_occurrence(RuleNb,[])
\ allocation_occurrence(C,O)
<=> Rule = pragma(rule([],Heads,_,_),_,_,_,_), \+ is_observed(C,O)
| NO is O + 1, allocation_occurrence(C,NO).
rule(RuleNb,Rule), occurrence(C,O,RuleNb,ID), allocation_occurrence(C,AO)
\ least_occurrence(RuleNb,[ID|IDs])
<=> AO >= O, \+ may_trigger(C) |
least_occurrence(RuleNb,IDs).
rule(RuleNb,Rule), passive(RuleNb,ID)
\ least_occurrence(RuleNb,[ID|IDs])
<=> least_occurrence(RuleNb,IDs).
rule(RuleNb,Rule)
==> Rule = pragma(rule([],_,_,_),ids([],IDs),_,_,_) |
least_occurrence(RuleNb,IDs).
least_occurrence(RuleNb,[]) \ is_least_occurrence(RuleNb)
<=> true.
is_least_occurrence(_)
<=> fail.
allocation_occurrence(C,O) \ get_allocation_occurrence(C,Q)
<=> Q = O.
get_allocation_occurrence(_,Q)
<=> chr_pp_flag(late_allocation,off), Q=0.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
rule(RuleNb,Rule) \ get_rule(RuleNb,Q)
<=> Q = Rule.
get_rule(_,_)
<=> fail.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% C O N S T R A I N T I N D E X %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
constraints
constraint_index/2, % constraint_index(F/A,DefaultStoreAndAttachedIndex)
get_constraint_index/2,
max_constraint_index/1, % max_constraint_index(MaxDefaultStoreAndAttachedIndex)
get_max_constraint_index/1.
option(mode,constraint_index(+,+)).
option(mode,max_constraint_index(+)).
constraint_index(C,Index) \ get_constraint_index(C,Query)
<=> Query = Index.
get_constraint_index(C,Query)
<=> fail.
max_constraint_index(Index) \ get_max_constraint_index(Query)
<=> Query = Index.
get_max_constraint_index(Query)
<=> Query = 0.
set_constraint_indices(Constraints) :-
set_constraint_indices(Constraints,1).
set_constraint_indices([],M) :-
N is M - 1,
max_constraint_index(N).
set_constraint_indices([C|Cs],N) :-
( ( chr_pp_flag(debugable, on) ; may_trigger(C) ; is_stored(C), get_store_type(C,default)) ->
constraint_index(C,N),
M is N + 1,
set_constraint_indices(Cs,M)
;
set_constraint_indices(Cs,N)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Translation
chr_translate(Declarations,NewDeclarations) :-
init_chr_pp_flags,
partition_clauses(Declarations,Constraints0,Rules0,OtherClauses),
check_declared_constraints(Constraints0),
( Constraints0 == [] ->
insert_declarations(OtherClauses, NewDeclarations)
;
generate_show_constraint(Constraints0,Constraints,Rules0,Rules),
add_constraints(Constraints),
add_rules(Rules),
% start analysis
check_rules(Rules,Constraints),
add_occurrences(Rules),
functional_dependency_analysis(Rules),
set_semantics_rules(Rules),
symmetry_analysis(Rules),
guard_simplification,
storage_analysis(Constraints),
observation_analysis(Constraints),
ai_observation_analysis(Constraints),
late_allocation(Constraints),
assume_constraint_stores(Constraints),
set_constraint_indices(Constraints),
% end analysis
constraints_code(Constraints,ConstraintClauses),
validate_store_type_assumptions(Constraints),
store_management_preds(Constraints,StoreClauses), % depends on actual code used
insert_declarations(OtherClauses, Clauses0),
chr_module_declaration(CHRModuleDeclaration),
append_lists([Clauses0,
StoreClauses,
ConstraintClauses,
CHRModuleDeclaration
],
NewDeclarations)
).
store_management_preds(Constraints,Clauses) :-
generate_attach_detach_a_constraint_all(Constraints,AttachAConstraintClauses),
generate_indexed_variables_clauses(Constraints,IndexedClauses),
generate_attach_increment(AttachIncrementClauses),
generate_attr_unify_hook(AttrUnifyHookClauses),
generate_extra_clauses(Constraints,ExtraClauses),
generate_insert_delete_constraints(Constraints,DeleteClauses),
generate_attach_code(Constraints,StoreClauses),
generate_counter_code(CounterClauses),
append_lists([AttachAConstraintClauses
,IndexedClauses
,AttachIncrementClauses
,AttrUnifyHookClauses
,ExtraClauses
,DeleteClauses
,StoreClauses
,CounterClauses
]
,Clauses).
insert_declarations(Clauses0, Clauses) :-
append(Clauses0,
[ (:- use_module(chr(chr_runtime)))
, (:- use_module(chr(chr_hashtable_store)))
, (:- use_module(library('clp/clp_events')))
],
Clauses).
generate_counter_code(Clauses) :-
( chr_pp_flag(store_counter,on) ->
Clauses = [
('$counter_init'(N1) :- nb_setval(N1,0)) ,
('$counter'(N2,X1) :- nb_getval(N2,X1)),
('$counter_inc'(N) :- nb_getval(N,X), Y is X + 1, nb_setval(N,Y)),
(:- '$counter_init'('$insert_counter')),
(:- '$counter_init'('$delete_counter')),
('$insert_counter_inc' :- '$counter_inc'('$insert_counter')),
('$delete_counter_inc' :- '$counter_inc'('$delete_counter')),
( counter_stats(I,D) :- '$counter'('$insert_counter',I),'$counter'('$delete_counter',D))
]
;
Clauses = []
).
% SWI-Prolog specific
chr_module_declaration(CHRModuleDeclaration) :-
get_target_module(Mod),
( Mod \== chr_translate ->
CHRModuleDeclaration = [
(:- multifile chr:'$chr_module'/1),
chr:'$chr_module'(Mod)
]
;
CHRModuleDeclaration = []
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Partitioning of clauses into constraint declarations, chr rules and other
%% clauses
partition_clauses([],[],[],[]).
partition_clauses([C|Cs],Ds,Rs,OCs) :-
( parse_rule(C,R) ->
Ds = RDs,
Rs = [R | RRs],
OCs = ROCs
; is_declaration(C,D) ->
append(D,RDs,Ds),
Rs = RRs,
OCs = ROCs
; is_module_declaration(C,Mod) ->
target_module(Mod),
Ds = RDs,
Rs = RRs,
OCs = [C|ROCs]
; is_type_definition(C) ->
Ds = RDs,
Rs = RRs,
OCs = ROCs
; C = (handler _) ->
format('CHR compiler WARNING: ~w.\n',[C]),
format(' `--> SICStus compatibility: ignoring handler/1 declaration.\n',[]),
Ds = RDs,
Rs = RRs,
OCs = ROCs
; C = (rules _) ->
format('CHR compiler WARNING: ~w.\n',[C]),
format(' `--> SICStus compatibility: ignoring rules/1 declaration.\n',[]),
Ds = RDs,
Rs = RRs,
OCs = ROCs
; C = option(OptionName,OptionValue) ->
handle_option(OptionName,OptionValue),
Ds = RDs,
Rs = RRs,
OCs = ROCs
; Ds = RDs,
Rs = RRs,
OCs = [C|ROCs]
),
partition_clauses(Cs,RDs,RRs,ROCs).
is_declaration(D, Constraints) :- %% constraint declaration
( D = (:- Decl) ->
true
;
D = Decl
),
Decl =.. [constraints,Cs],
conj2list(Cs,Constraints0),
extract_type_mode(Constraints0,Constraints).
extract_type_mode([],[]).
extract_type_mode([F/A|R],[F/A|R2]) :- !,extract_type_mode(R,R2).
extract_type_mode([C|R],[C2|R2]) :-
functor(C,F,A),C2=F/A,
C =.. [_|Args],
extract_types_and_modes(Args,ArgTypes,ArgModes),
constraint_type(F/A,ArgTypes),
constraint_mode(F/A,ArgModes),
extract_type_mode(R,R2).
extract_types_and_modes([],[],[]).
extract_types_and_modes([+(T)|R],[T|R2],[(+)|R3]) :- !,extract_types_and_modes(R,R2,R3).
extract_types_and_modes([?(T)|R],[T|R2],[(?)|R3]) :- !,extract_types_and_modes(R,R2,R3).
extract_types_and_modes([-(T)|R],[T|R2],[(?)|R3]) :- !,extract_types_and_modes(R,R2,R3).
extract_types_and_modes([Illegal|R],_,_) :-
format('CHR compiler ERROR: Illegal mode/type declaration "~w".\n',
[Illegal]),
format(' `--> correct syntax is +type, -type or ?type.\n',[]),
fail.
is_type_definition(D) :-
( D = (:- TDef) ->
true
;
D = TDef
),
TDef =.. [chr_type,TypeDef],
( TypeDef = (Name ---> Def) ->
tdisj2list(Def,DefList),
type_definition(Name,DefList)
;
format('CHR compiler WARNING: Illegal type definition "~w".\n',[TypeDef]),
format(' `--> Ignoring this malformed type definition.\n',[])
).
% no removal of fails, e.g. :- type bool ---> true ; fail.
tdisj2list(Conj,L) :-
tdisj2list(Conj,L,[]).
tdisj2list(Conj,L,T) :-
Conj = (G1;G2), !,
tdisj2list(G1,L,T1),
tdisj2list(G2,T1,T).
tdisj2list(G,[G | T],T).
%% Data Declaration
%%
%% pragma_rule
%% -> pragma(
%% rule,
%% ids,
%% list(pragma),
%% yesno(string), :: maybe rule nane
%% int :: rule number
%% )
%%
%% ids -> ids(
%% list(int),
%% list(int)
%% )
%%
%% rule -> rule(
%% list(constraint), :: constraints to be removed
%% list(constraint), :: surviving constraints
%% goal, :: guard
%% goal :: body
%% )
parse_rule(RI,R) :- %% name @ rule
RI = (Name @ RI2), !,
rule(RI2,yes(Name),R).
parse_rule(RI,R) :-
rule(RI,no,R).
rule(RI,Name,R) :-
RI = (RI2 pragma P), !, %% pragmas
is_rule(RI2,R1,IDs),
conj2list(P,Ps),
inc_rule_count(RuleCount),
R = pragma(R1,IDs,Ps,Name,RuleCount).
rule(RI,Name,R) :-
is_rule(RI,R1,IDs),
inc_rule_count(RuleCount),
R = pragma(R1,IDs,[],Name,RuleCount).
is_rule(RI,R,IDs) :- %% propagation rule
RI = (H ==> B), !,
conj2list(H,Head2i),
get_ids(Head2i,IDs2,Head2),
IDs = ids([],IDs2),
( B = (G | RB) ->
R = rule([],Head2,G,RB)
;
R = rule([],Head2,true,B)
).
is_rule(RI,R,IDs) :- %% simplification/simpagation rule
RI = (H <=> B), !,
( B = (G | RB) ->
Guard = G,
Body = RB
; Guard = true,
Body = B
),
( H = (H1 \ H2) ->
conj2list(H1,Head2i),
conj2list(H2,Head1i),
get_ids(Head2i,IDs2,Head2,0,N),
get_ids(Head1i,IDs1,Head1,N,_),
IDs = ids(IDs1,IDs2)
; conj2list(H,Head1i),
Head2 = [],
get_ids(Head1i,IDs1,Head1),
IDs = ids(IDs1,[])
),
R = rule(Head1,Head2,Guard,Body).
get_ids(Cs,IDs,NCs) :-
get_ids(Cs,IDs,NCs,0,_).
get_ids([],[],[],N,N).
get_ids([C|Cs],[N|IDs],[NC|NCs],N,NN) :-
( C = (NC # N) ->
true
;
NC = C
),
M is N + 1,
get_ids(Cs,IDs,NCs, M,NN).
is_module_declaration((:- module(Mod)),Mod).
is_module_declaration((:- module(Mod,_)),Mod).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Add constraints
add_constraints([]).
add_constraints([C|Cs]) :-
max_occurrence(C,0),
C = _/A,
length(Mode,A),
set_elems(Mode,?),
constraint_mode(C,Mode),
add_constraints(Cs).
% Add rules
add_rules([]).
add_rules([Rule|Rules]) :-
Rule = pragma(_,_,_,_,RuleNb),
rule(RuleNb,Rule),
add_rules(Rules).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Some input verification:
check_declared_constraints(Constraints) :-
check_declared_constraints(Constraints,[]).
check_declared_constraints([],_).
check_declared_constraints([C|Cs],Acc) :-
( memberchk_eq(C,Acc) ->
format('CHR compiler ERROR: constraint ~w multiply defined.\n',[C]),
format(' `--> Remove redundant declaration!\n',[]),
fail
;
true
),
check_declared_constraints(Cs,[C|Acc]).
%% - all constraints in heads are declared constraints
%% - all passive pragmas refer to actual head constraints
check_rules([],_).
check_rules([PragmaRule|Rest],Decls) :-
check_rule(PragmaRule,Decls),
check_rules(Rest,Decls).
check_rule(PragmaRule,Decls) :-
check_rule_indexing(PragmaRule),
PragmaRule = pragma(Rule,_IDs,Pragmas,_Name,_N),
Rule = rule(H1,H2,_,_),
append(H1,H2,HeadConstraints),
check_head_constraints(HeadConstraints,Decls,PragmaRule),
check_pragmas(Pragmas,PragmaRule).
check_head_constraints([],_,_).
check_head_constraints([Constr|Rest],Decls,PragmaRule) :-
functor(Constr,F,A),
( member(F/A,Decls) ->
check_head_constraints(Rest,Decls,PragmaRule)
;
format('CHR compiler ERROR: Undeclared constraint ~w in head of ~@.\n',
[F/A,format_rule(PragmaRule)]),
format(' `--> Constraint should be one of ~w.\n',[Decls]),
fail
).
check_pragmas([],_).
check_pragmas([Pragma|Pragmas],PragmaRule) :-
check_pragma(Pragma,PragmaRule),
check_pragmas(Pragmas,PragmaRule).
check_pragma(Pragma,PragmaRule) :-
var(Pragma), !,
format('CHR compiler ERROR: invalid pragma ~w in ~@.\n',
[Pragma,format_rule(PragmaRule)]),
format(' `--> Pragma should not be a variable!\n',[]),
fail.
check_pragma(passive(ID), PragmaRule) :-
!,
PragmaRule = pragma(_,ids(IDs1,IDs2),_,_,RuleNb),
( memberchk_eq(ID,IDs1) ->
true
; memberchk_eq(ID,IDs2) ->
true
;
format('CHR compiler ERROR: invalid identifier ~w in pragma passive in ~@.\n',
[ID,format_rule(PragmaRule)]),
fail
),
passive(RuleNb,ID).
check_pragma(Pragma, PragmaRule) :-
Pragma = already_in_heads,
!,
format('CHR compiler WARNING: currently unsupported pragma ~w in ~@.\n',[Pragma,format_rule(PragmaRule)]),
format(' `--> Pragma is ignored. Termination and correctness may be affected \n',[]).
check_pragma(Pragma, PragmaRule) :-
Pragma = already_in_head(_),
!,
format('CHR compiler WARNING: currently unsupported pragma ~w in ~@.\n',[Pragma,format_rule(PragmaRule)]),
format(' `--> Pragma is ignored. Termination and correctness may be affected \n',[]).
check_pragma(Pragma,PragmaRule) :-
format('CHR compiler ERROR: invalid pragma ~w in ~@.\n',[Pragma,format_rule(PragmaRule)]),
format(' `--> Pragma should be one of passive/1!\n',[]),
fail.
format_rule(PragmaRule) :-
PragmaRule = pragma(_,_,_,MaybeName,N),
( MaybeName = yes(Name) ->
write('rule '), write(Name)
;
write('rule number '), write(N)
).
check_rule_indexing(PragmaRule) :-
PragmaRule = pragma(Rule,_,_,_,_),
Rule = rule(H1,H2,G,_),
term_variables(H1-H2,HeadVars),
remove_anti_monotonic_guards(G,HeadVars,NG),
check_indexing(H1,NG-H2),
check_indexing(H2,NG-H1).
remove_anti_monotonic_guards(G,Vars,NG) :-
conj2list(G,GL),
remove_anti_monotonic_guard_list(GL,Vars,NGL),
list2conj(NGL,NG).
remove_anti_monotonic_guard_list([],_,[]).
remove_anti_monotonic_guard_list([G|Gs],Vars,NGs) :-
( G = var(X),
memberchk_eq(X,Vars) ->
NGs = RGs
;
NGs = [G|RGs]
),
remove_anti_monotonic_guard_list(Gs,Vars,RGs).
check_indexing([],_).
check_indexing([Head|Heads],Other) :-
functor(Head,F,A),
Head =.. [_|Args],
term_variables(Heads-Other,OtherVars),
check_indexing(Args,1,F/A,OtherVars),
check_indexing(Heads,[Head|Other]).
check_indexing([],_,_,_).
check_indexing([Arg|Args],I,FA,OtherVars) :-
( is_indexed_argument(FA,I) ->
true
; nonvar(Arg) ->
indexed_argument(FA,I)
; % var(Arg) ->
term_variables(Args,ArgsVars),
append(ArgsVars,OtherVars,RestVars),
( memberchk_eq(Arg,RestVars) ->
indexed_argument(FA,I)
;
true
)
),
J is I + 1,
term_variables(Arg,NVars),
append(NVars,OtherVars,NOtherVars),
check_indexing(Args,J,FA,NOtherVars).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Occurrences
add_occurrences([]).
add_occurrences([Rule|Rules]) :-
Rule = pragma(rule(H1,H2,_,_),ids(IDs1,IDs2),_,_,Nb),
add_occurrences(H1,IDs1,Nb),
add_occurrences(H2,IDs2,Nb),
add_occurrences(Rules).
add_occurrences([],[],_).
add_occurrences([H|Hs],[ID|IDs],RuleNb) :-
functor(H,F,A),
FA = F/A,
new_occurrence(FA,RuleNb,ID),
add_occurrences(Hs,IDs,RuleNb).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Observation Analysis
%
% CLASSIFICATION
% Legacy
%
% - approximative: should make decision in late allocation analysis per body
% TODO:
% remove
is_observed(C,O) :-
is_self_observer(C),
ai_is_observed(C,O).
constraints
observes/2,
spawns_observer/2,
observes_indirectly/2,
is_self_observer/1
.
option(mode,observes(+,+)).
option(mode,spawns_observer(+,+)).
option(mode,observes_indirectly(+,+)).
spawns_observer(C1,C2) \ spawns_observer(C1,C2) <=> true.
observes(C1,C2) \ observes(C1,C2) <=> true.
observes_indirectly(C1,C2) \ observes_indirectly(C1,C2) <=> true.
spawns_observer(C1,C2), observes(C2,C3) ==> observes_indirectly(C1,C3).
spawns_observer(C1,C2), observes_indirectly(C2,C3) ==> observes_indirectly(C1,C3).
observes_indirectly(C,C) \ is_self_observer(C) <=> true.
is_self_observer(_) <=> chr_pp_flag(observation_analysis,off).
% fails if analysis has not been run
observation_analysis(Cs) :-
( chr_pp_flag(observation,on) ->
observation_analysis(Cs,Cs)
;
true
).
observation_analysis([],_).
observation_analysis([C|Cs],Constraints) :-
get_max_occurrence(C,MO),
observation_analysis_occurrences(C,1,MO,Constraints),
observation_analysis(Cs,Constraints).
observation_analysis_occurrences(C,O,MO,Cs) :-
( O > MO ->
true
;
observation_analysis_occurrence(C,O,Cs),
NO is O + 1,
observation_analysis_occurrences(C,NO,MO,Cs)
).
observation_analysis_occurrence(C,O,Cs) :-
get_occurrence(C,O,RuleNb,ID),
( is_passive(RuleNb,ID) ->
true
;
get_rule(RuleNb,PragmaRule),
PragmaRule = pragma(rule(Heads1,Heads2,_,Body),ids(IDs1,IDs2),_,_,_),
( select2(ID,_Head,IDs1,Heads1,_RIDs1,RHeads1) ->
append(RHeads1,Heads2,OtherHeads)
; select2(ID,_Head,IDs2,Heads2,_RIDs2,RHeads2) ->
append(RHeads2,Heads1,OtherHeads)
),
observe_heads(C,OtherHeads),
observe_body(C,Body,Cs)
).
observe_heads(C,Heads) :-
findall(F/A,(member(H,Heads),functor(H,F,A)),Cs),
observe_all(C,Cs).
observe_all(C,Cs) :-
( Cs = [C1|Cr] ->
observes(C,C1),
observe_all(C,Cr)
;
true
).
spawn_all(C,Cs) :-
( Cs = [C1|Cr] ->
spawns_observer(C,C1),
spawn_all(C,Cr)
;
true
).
spawn_all_triggers(C,Cs) :-
( Cs = [C1|Cr] ->
( may_trigger(C1) ->
spawns_observer(C,C1)
;
true
),
spawn_all_triggers(C,Cr)
;
true
).
observe_body(C,Body,Cs) :-
( var(Body) ->
spawn_all(C,Cs)
; Body = true ->
true
; Body = fail ->
true
; Body = (B1,B2) ->
observe_body(C,B1,Cs),
observe_body(C,B2,Cs)
; Body = (B1;B2) ->
observe_body(C,B1,Cs),
observe_body(C,B2,Cs)
; Body = (B1->B2) ->
observe_body(C,B1,Cs),
observe_body(C,B2,Cs)
; functor(Body,F,A), member(F/A,Cs) ->
spawns_observer(C,F/A)
; Body = (_ = _) ->
spawn_all_triggers(C,Cs)
; Body = (_ is _) ->
spawn_all_triggers(C,Cs)
; binds_b(Body,Vars) ->
( Vars == [] ->
true
;
spawn_all_triggers(C,Cs)
)
;
spawn_all(C,Cs)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Late allocation
late_allocation_analysis(Cs) :-
( chr_pp_flag(late_allocation,on) ->
late_allocation(Cs)
;
true
).
late_allocation([]).
late_allocation([C|Cs]) :-
allocation_occurrence(C,1),
late_allocation(Cs).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Generated predicates
%% attach_$CONSTRAINT
%% attach_increment
%% detach_$CONSTRAINT
%% attr_unify_hook
%% attach_$CONSTRAINT
generate_attach_detach_a_constraint_all([],[]).
generate_attach_detach_a_constraint_all([Constraint|Constraints],Clauses) :-
( ( chr_pp_flag(debugable,on) ; may_trigger(Constraint)) ->
generate_attach_a_constraint(Constraint,Clauses1),
generate_detach_a_constraint(Constraint,Clauses2)
;
Clauses1 = [],
Clauses2 = []
),
generate_attach_detach_a_constraint_all(Constraints,Clauses3),
append_lists([Clauses1,Clauses2,Clauses3],Clauses).
generate_attach_a_constraint(Constraint,[Clause1,Clause2]) :-
generate_attach_a_constraint_empty_list(Constraint,Clause1),
get_max_constraint_index(N),
( N == 1 ->
generate_attach_a_constraint_1_1(Constraint,Clause2)
;
generate_attach_a_constraint_t_p(Constraint,Clause2)
).
generate_attach_a_constraint_skeleton(FA,Args,Body,Clause) :-
make_name('attach_',FA,Fct),
Head =.. [Fct | Args],
Clause = ( Head :- Body).
generate_attach_a_constraint_empty_list(FA,Clause) :-
generate_attach_a_constraint_skeleton(FA,[[],_],true,Clause).
generate_attach_a_constraint_1_1(FA,Clause) :-
Args = [[Var|Vars],Susp],
generate_attach_a_constraint_skeleton(FA,Args,Body,Clause),
generate_attach_body_1(FA,Var,Susp,AttachBody),
make_name('attach_',FA,Fct),
RecursiveCall =.. [Fct,Vars,Susp],
% SWI-Prolog specific code
chr_pp_flag(solver_events,NMod),
( NMod \== none ->
Args = [[Var|_],Susp],
get_target_module(Mod),
Subscribe = clp_events:subscribe(Var,NMod,Mod,chr_runtime:'chr run_suspensions'([Susp]))
;
Subscribe = true
),
Body =
(
AttachBody,
Subscribe,
RecursiveCall
).
generate_attach_body_1(FA,Var,Susp,Body) :-
get_target_module(Mod),
Body =
( get_attr(Var, Mod, Susps) ->
NewSusps=[Susp|Susps],
put_attr(Var, Mod, NewSusps)
;
put_attr(Var, Mod, [Susp])
).
generate_attach_a_constraint_t_p(FA,Clause) :-
Args = [[Var|Vars],Susp],
generate_attach_a_constraint_skeleton(FA,Args,Body,Clause),
make_name('attach_',FA,Fct),
RecursiveCall =.. [Fct,Vars,Susp],
generate_attach_body_n(FA,Var,Susp,AttachBody),
% SWI-Prolog specific code
chr_pp_flag(solver_events,NMod),
( NMod \== none ->
Args = [[Var|_],Susp],
get_target_module(Mod),
Subscribe = clp_events:subscribe(Var,NMod,Mod,chr_runtime:'chr run_suspensions'([Susp]))
;
Subscribe = true
),
Body =
(
AttachBody,
Subscribe,
RecursiveCall
).
generate_attach_body_n(F/A,Var,Susp,Body) :-
get_constraint_index(F/A,Position),
or_pattern(Position,Pattern),
get_max_constraint_index(Total),
make_attr(Total,Mask,SuspsList,Attr),
nth(Position,SuspsList,Susps),
substitute(Susps,SuspsList,[Susp|Susps],SuspsList1),
make_attr(Total,Mask,SuspsList1,NewAttr1),
substitute(Susps,SuspsList,[Susp],SuspsList2),
make_attr(Total,NewMask,SuspsList2,NewAttr2),
copy_term(SuspsList,SuspsList3),
nth(Position,SuspsList3,[Susp]),
chr_delete(SuspsList3,[Susp],RestSuspsList),
set_elems(RestSuspsList,[]),
make_attr(Total,Pattern,SuspsList3,NewAttr3),
get_target_module(Mod),
Body =
( get_attr(Var,Mod,TAttr) ->
TAttr = Attr,
( Mask /\ Pattern =:= Pattern ->
put_attr(Var, Mod, NewAttr1)
;
NewMask is Mask \/ Pattern,
put_attr(Var, Mod, NewAttr2)
)
;
put_attr(Var,Mod,NewAttr3)
).
%% detach_$CONSTRAINT
generate_detach_a_constraint(Constraint,[Clause1,Clause2]) :-
generate_detach_a_constraint_empty_list(Constraint,Clause1),
get_max_constraint_index(N),
( N == 1 ->
generate_detach_a_constraint_1_1(Constraint,Clause2)
;
generate_detach_a_constraint_t_p(Constraint,Clause2)
).
generate_detach_a_constraint_empty_list(FA,Clause) :-
make_name('detach_',FA,Fct),
Args = [[],_],
Head =.. [Fct | Args],
Clause = ( Head :- true).
generate_detach_a_constraint_1_1(FA,Clause) :-
make_name('detach_',FA,Fct),
Args = [[Var|Vars],Susp],
Head =.. [Fct | Args],
RecursiveCall =.. [Fct,Vars,Susp],
generate_detach_body_1(FA,Var,Susp,DetachBody),
Body =
(
DetachBody,
RecursiveCall
),
Clause = (Head :- Body).
generate_detach_body_1(FA,Var,Susp,Body) :-
get_target_module(Mod),
Body =
( get_attr(Var,Mod,Susps) ->
'chr sbag_del_element'(Susps,Susp,NewSusps),
( NewSusps == [] ->
del_attr(Var,Mod)
;
put_attr(Var,Mod,NewSusps)
)
;
true
).
generate_detach_a_constraint_t_p(FA,Clause) :-
make_name('detach_',FA,Fct),
Args = [[Var|Vars],Susp],
Head =.. [Fct | Args],
RecursiveCall =.. [Fct,Vars,Susp],
generate_detach_body_n(FA,Var,Susp,DetachBody),
Body =
(
DetachBody,
RecursiveCall
),
Clause = (Head :- Body).
generate_detach_body_n(F/A,Var,Susp,Body) :-
get_constraint_index(F/A,Position),
or_pattern(Position,Pattern),
and_pattern(Position,DelPattern),
get_max_constraint_index(Total),
make_attr(Total,Mask,SuspsList,Attr),
nth(Position,SuspsList,Susps),
substitute(Susps,SuspsList,[],SuspsList1),
make_attr(Total,NewMask,SuspsList1,Attr1),
substitute(Susps,SuspsList,NewSusps,SuspsList2),
make_attr(Total,Mask,SuspsList2,Attr2),
get_target_module(Mod),
Body =
( get_attr(Var,Mod,TAttr) ->
TAttr = Attr,
( Mask /\ Pattern =:= Pattern ->
'chr sbag_del_element'(Susps,Susp,NewSusps),
( NewSusps == [] ->
NewMask is Mask /\ DelPattern,
( NewMask == 0 ->
del_attr(Var,Mod)
;
put_attr(Var,Mod,Attr1)
)
;
put_attr(Var,Mod,Attr2)
)
;
true
)
;
true
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
generate_indexed_variables_clauses(Constraints,Clauses) :-
( forsome(C,Constraints,chr_translate:may_trigger(C)) ->
generate_indexed_variables_clauses_(Constraints,Clauses)
;
Clauses = []
).
generate_indexed_variables_clauses_([],[]).
generate_indexed_variables_clauses_([C|Cs],Clauses) :-
( is_stored(C) ->
Clauses = [Clause|RestClauses],
generate_indexed_variables_clause(C,Clause)
;
Clauses = RestClauses
),
generate_indexed_variables_clauses_(Cs,RestClauses).
%===============================================================================
constraints generate_indexed_variables_clause/2.
option(mode,generate_indexed_variables_clause(+,+)).
%-------------------------------------------------------------------------------
constraint_mode(F/A,ArgModes) \ generate_indexed_variables_clause(F/A,Clause) <=>
functor(Term,F,A),
Term =.. [_|Args],
create_indexed_variables_body(Args,ArgModes,Vars,1,F/A,MaybeBody,N),
( MaybeBody == empty ->
Body = (Vars = [])
; N == 0 ->
Body = term_variables(Susp,Vars)
;
MaybeBody = Body
),
Clause =
( '$indexed_variables'(Susp,Vars) :-
Susp = Term,
Body
).
generate_indexed_variables_clause(FA,_) <=>
format('ERROR: generate_indexed_variables_clause: missing mode info for ~w\n',[FA]),
fail.
%===============================================================================
create_indexed_variables_body([],[],_,_,_,empty,0).
create_indexed_variables_body([V|Vs],[Mode|Modes],Vars,I,FA,Body,N) :-
J is I + 1,
create_indexed_variables_body(Vs,Modes,Tail,J,FA,RBody,M),
( Mode \== (+),
is_indexed_argument(FA,I) ->
( RBody == empty ->
Body = term_variables(V,Vars)
;
Body = (term_variables(V,Vars,Tail),RBody)
),
N = M
;
Vars = Tail,
Body = RBody,
N is M + 1
).
generate_extra_clauses(Constraints,List) :-
generate_activate_clause(List,Tail0),
generate_remove_clause(Tail0,Tail1),
generate_allocate_clause(Tail1,Tail2),
generate_insert_constraint_internal(Tail2,Tail3),
global_indexed_variables_clause(Constraints,Tail3,[]).
generate_remove_clause(List,Tail) :-
( is_used_auxiliary_predicate(remove_constraint_internal) ->
List = [RemoveClause|Tail],
use_auxiliary_predicate(chr_indexed_variables),
RemoveClause =
(
remove_constraint_internal(Susp, Agenda, Delete) :-
arg( 2, Susp, Mref),
Mref = mutable(State), % get_mutable( State, Mref), % XXX Inlined
'chr update_mutable'( removed, Mref), % mark in any case
( compound(State) -> % passive/1
Agenda = [],
Delete = no
; State==removed ->
Agenda = [],
Delete = no
%; State==triggered ->
% Agenda = []
;
Delete = yes,
chr_indexed_variables(Susp,Agenda)
)
)
;
List = Tail
).
generate_activate_clause(List,Tail) :-
( is_used_auxiliary_predicate(activate_constraint) ->
List = [ActivateClause|Tail],
use_auxiliary_predicate(chr_indexed_variables),
ActivateClause =
(
activate_constraint(Store, Vars, Susp, Generation) :-
arg( 2, Susp, Mref),
Mref = mutable(State), % get_mutable( State, Mref), % XXX Inlined
'chr 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,
'chr update_mutable'( Generation, Gref)
),
( compound(State) -> % passive/1
term_variables( State, Vars),
'chr none_locked'( Vars),
Store = yes
; State == removed -> % the price for eager removal ...
chr_indexed_variables(Susp,Vars),
Store = yes
;
Vars = [],
Store = no
)
)
;
List = Tail
).
generate_allocate_clause(List,Tail) :-
( is_used_auxiliary_predicate(allocate_constraint) ->
List = [AllocateClause|Tail],
use_auxiliary_predicate(chr_indexed_variables),
AllocateClause =
(
allocate_constraint( Closure, Self, F, Args) :-
Self =.. [suspension,Id,Mref,Closure,Gref,Href,F|Args],
Gref = mutable(0),
'chr empty_history'(History),
Href = mutable(History),
chr_indexed_variables(Self,Vars),
Mref = mutable(passive(Vars)),
'chr gen_id'( Id)
)
;
List = Tail
).
generate_insert_constraint_internal(List,Tail) :-
( is_used_auxiliary_predicate(insert_constraint_internal) ->
List = [Clause|Tail],
use_auxiliary_predicate(chr_indexed_variables),
Clause =
(
insert_constraint_internal(yes, Vars, Self, Closure, F, Args) :-
Self =.. [suspension,Id,Mref,Closure,Gref,Href,F|Args],
chr_indexed_variables(Self,Vars),
'chr none_locked'(Vars),
Mref = mutable(active),
Gref = mutable(0),
Href = mutable(History),
'chr empty_history'(History),
'chr gen_id'(Id)
)
;
List = Tail
).
global_indexed_variables_clause(Constraints,List,Tail) :-
( is_used_auxiliary_predicate(chr_indexed_variables) ->
List = [Clause|Tail],
( chr_pp_flag(reduced_indexing,on) ->
( forsome(C,Constraints,chr_translate:may_trigger(C)) ->
Body = (Susp =.. [_,_,_,_,_,_,Term|_], '$indexed_variables'(Term,Vars))
;
Body = true,
Vars = []
),
Clause = ( chr_indexed_variables(Susp,Vars) :- Body )
;
Clause =
( chr_indexed_variables(Susp,Vars) :-
'chr chr_indexed_variables'(Susp,Vars)
)
)
;
List = Tail
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
generate_attach_increment(Clauses) :-
get_max_constraint_index(N),
( N > 0 ->
Clauses = [Clause1,Clause2],
generate_attach_increment_empty(Clause1),
( N == 1 ->
generate_attach_increment_one(Clause2)
;
generate_attach_increment_many(N,Clause2)
)
;
Clauses = []
).
generate_attach_increment_empty((attach_increment([],_) :- true)).
generate_attach_increment_one(Clause) :-
Head = attach_increment([Var|Vars],Susps),
get_target_module(Mod),
Body =
(
'chr not_locked'(Var),
( get_attr(Var,Mod,VarSusps) ->
sort(VarSusps,SortedVarSusps),
merge(Susps,SortedVarSusps,MergedSusps),
put_attr(Var,Mod,MergedSusps)
;
put_attr(Var,Mod,Susps)
),
attach_increment(Vars,Susps)
),
Clause = (Head :- Body).
generate_attach_increment_many(N,Clause) :-
make_attr(N,Mask,SuspsList,Attr),
make_attr(N,OtherMask,OtherSuspsList,OtherAttr),
Head = attach_increment([Var|Vars],Attr),
bagof(G,X ^ Y ^ SY ^ M ^ (member2(SuspsList,OtherSuspsList,X-Y),G = (sort(Y,SY),'chr merge_attributes'(X,SY,M))),Gs),
list2conj(Gs,SortGoals),
bagof(MS,A ^ B ^ C ^ member((A,'chr merge_attributes'(B,C,MS)),Gs), MergedSuspsList),
make_attr(N,MergedMask,MergedSuspsList,NewAttr),
get_target_module(Mod),
Body =
(
'chr not_locked'(Var),
( get_attr(Var,Mod,TOtherAttr) ->
TOtherAttr = OtherAttr,
SortGoals,
MergedMask is Mask \/ OtherMask,
put_attr(Var,Mod,NewAttr)
;
put_attr(Var,Mod,Attr)
),
attach_increment(Vars,Attr)
),
Clause = (Head :- Body).
%% attr_unify_hook
generate_attr_unify_hook(Clauses) :-
get_max_constraint_index(N),
( N == 0 ->
Clauses = []
;
Clauses = [Clause],
( N == 1 ->
generate_attr_unify_hook_one(Clause)
;
generate_attr_unify_hook_many(N,Clause)
)
).
generate_attr_unify_hook_one(Clause) :-
Head = attr_unify_hook(Susps,Other),
get_target_module(Mod),
make_run_suspensions(NewSusps,WakeNewSusps),
make_run_suspensions(Susps,WakeSusps),
Body =
(
sort(Susps, SortedSusps),
( var(Other) ->
( get_attr(Other,Mod,OtherSusps) ->
true
;
OtherSusps = []
),
sort(OtherSusps,SortedOtherSusps),
'chr merge_attributes'(SortedSusps,SortedOtherSusps,NewSusps),
put_attr(Other,Mod,NewSusps),
WakeNewSusps
;
( compound(Other) ->
term_variables(Other,OtherVars),
attach_increment(OtherVars, SortedSusps)
;
true
),
WakeSusps
)
),
Clause = (Head :- Body).
generate_attr_unify_hook_many(N,Clause) :-
make_attr(N,Mask,SuspsList,Attr),
make_attr(N,OtherMask,OtherSuspsList,OtherAttr),
bagof(Sort,A ^ B ^ ( member(A,SuspsList) , Sort = sort(A,B) ) , SortGoalList),
list2conj(SortGoalList,SortGoals),
bagof(B, A ^ member(sort(A,B),SortGoalList), SortedSuspsList),
bagof(C, D ^ E ^ F ^ G ^ (member2(SortedSuspsList,OtherSuspsList,D-E),
C = (sort(E,F),
'chr merge_attributes'(D,F,G)) ),
SortMergeGoalList),
bagof(G, D ^ F ^ H ^ member((H,'chr merge_attributes'(D,F,G)),SortMergeGoalList) , MergedSuspsList),
list2conj(SortMergeGoalList,SortMergeGoals),
make_attr(N,MergedMask,MergedSuspsList,MergedAttr),
make_attr(N,Mask,SortedSuspsList,SortedAttr),
Head = attr_unify_hook(Attr,Other),
get_target_module(Mod),
make_run_suspensions_loop(MergedSuspsList,WakeMergedSusps),
make_run_suspensions_loop(SortedSuspsList,WakeSortedSusps),
Body =
(
SortGoals,
( var(Other) ->
( get_attr(Other,Mod,TOtherAttr) ->
TOtherAttr = OtherAttr,
SortMergeGoals,
MergedMask is Mask \/ OtherMask,
put_attr(Other,Mod,MergedAttr),
WakeMergedSusps
;
put_attr(Other,Mod,SortedAttr),
WakeSortedSusps
)
;
( compound(Other) ->
term_variables(Other,OtherVars),
attach_increment(OtherVars,SortedAttr)
;
true
),
WakeSortedSusps
)
),
Clause = (Head :- Body).
make_run_suspensions(Susps,Goal) :-
( chr_pp_flag(debugable,on) ->
Goal = 'chr run_suspensions_d'(Susps)
;
Goal = 'chr run_suspensions'(Susps)
).
make_run_suspensions_loop(SuspsList,Goal) :-
( chr_pp_flag(debugable,on) ->
Goal = 'chr run_suspensions_loop_d'(SuspsList)
;
Goal = 'chr run_suspensions_loop'(SuspsList)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% $insert_in_store_F/A
% $delete_from_store_F/A
generate_insert_delete_constraints([],[]).
generate_insert_delete_constraints([FA|Rest],Clauses) :-
( is_stored(FA) ->
Clauses = [IClause,DClause|RestClauses],
generate_insert_delete_constraint(FA,IClause,DClause)
;
Clauses = RestClauses
),
generate_insert_delete_constraints(Rest,RestClauses).
generate_insert_delete_constraint(FA,IClause,DClause) :-
get_store_type(FA,StoreType),
generate_insert_constraint(StoreType,FA,IClause),
generate_delete_constraint(StoreType,FA,DClause).
generate_insert_constraint(StoreType,C,Clause) :-
make_name('$insert_in_store_',C,ClauseName),
Head =.. [ClauseName,Susp],
generate_insert_constraint_body(StoreType,C,Susp,Body),
( chr_pp_flag(store_counter,on) ->
InsertCounterInc = '$insert_counter_inc'
;
InsertCounterInc = true
),
Clause = (Head :- InsertCounterInc,Body).
generate_insert_constraint_body(default,C,Susp,Body) :-
get_target_module(Mod),
get_max_constraint_index(Total),
( Total == 1 ->
generate_attach_body_1(C,Store,Susp,AttachBody)
;
generate_attach_body_n(C,Store,Susp,AttachBody)
),
Body =
(
'chr global_term_ref_1'(Store),
AttachBody
).
generate_insert_constraint_body(multi_hash(Indexes),C,Susp,Body) :-
generate_multi_hash_insert_constraint_bodies(Indexes,C,Susp,Body).
generate_insert_constraint_body(global_ground,C,Susp,Body) :-
global_ground_store_name(C,StoreName),
Body =
(
nb_getval(StoreName,Store),
b_setval(StoreName,[Susp|Store])
).
generate_insert_constraint_body(global_singleton,C,Susp,Body) :-
global_singleton_store_name(C,StoreName),
Body =
(
b_setval(StoreName,Susp)
).
generate_insert_constraint_body(multi_store(StoreTypes),C,Susp,Body) :-
find_with_var_identity(
B,
[Susp],
(
member(ST,StoreTypes),
chr_translate:generate_insert_constraint_body(ST,C,Susp,B)
),
Bodies
),
list2conj(Bodies,Body).
generate_multi_hash_insert_constraint_bodies([],_,_,true).
generate_multi_hash_insert_constraint_bodies([Index|Indexes],FA,Susp,(Body,Bodies)) :-
multi_hash_store_name(FA,Index,StoreName),
multi_hash_key(FA,Index,Susp,KeyBody,Key),
Body =
(
KeyBody,
nb_getval(StoreName,Store),
insert_ht(Store,Key,Susp)
),
generate_multi_hash_insert_constraint_bodies(Indexes,FA,Susp,Bodies).
generate_delete_constraint(StoreType,FA,Clause) :-
make_name('$delete_from_store_',FA,ClauseName),
Head =.. [ClauseName,Susp],
generate_delete_constraint_body(StoreType,FA,Susp,Body),
( chr_pp_flag(store_counter,on) ->
DeleteCounterInc = '$delete_counter_inc'
;
DeleteCounterInc = true
),
Clause = (Head :- DeleteCounterInc, Body).
generate_delete_constraint_body(default,C,Susp,Body) :-
get_target_module(Mod),
get_max_constraint_index(Total),
( Total == 1 ->
generate_detach_body_1(C,Store,Susp,DetachBody),
Body =
(
'chr global_term_ref_1'(Store),
DetachBody
)
;
generate_detach_body_n(C,Store,Susp,DetachBody),
Body =
(
'chr global_term_ref_1'(Store),
DetachBody
)
).
generate_delete_constraint_body(multi_hash(Indexes),C,Susp,Body) :-
generate_multi_hash_delete_constraint_bodies(Indexes,C,Susp,Body).
generate_delete_constraint_body(global_ground,C,Susp,Body) :-
global_ground_store_name(C,StoreName),
Body =
(
nb_getval(StoreName,Store),
'chr sbag_del_element'(Store,Susp,NStore),
b_setval(StoreName,NStore)
).
generate_delete_constraint_body(global_singleton,C,_Susp,Body) :-
global_singleton_store_name(C,StoreName),
Body =
(
b_setval(StoreName,[])
).
generate_delete_constraint_body(multi_store(StoreTypes),C,Susp,Body) :-
find_with_var_identity(
B,
[Susp],
(
member(ST,StoreTypes),
chr_translate:generate_delete_constraint_body(ST,C,Susp,B)
),
Bodies
),
list2conj(Bodies,Body).
generate_multi_hash_delete_constraint_bodies([],_,_,true).
generate_multi_hash_delete_constraint_bodies([Index|Indexes],FA,Susp,(Body,Bodies)) :-
multi_hash_store_name(FA,Index,StoreName),
multi_hash_key(FA,Index,Susp,KeyBody,Key),
Body =
(
KeyBody,
nb_getval(StoreName,Store),
delete_ht(Store,Key,Susp)
),
generate_multi_hash_delete_constraint_bodies(Indexes,FA,Susp,Bodies).
generate_delete_constraint_call(FA,Susp,Call) :-
make_name('$delete_from_store_',FA,Functor),
Call =.. [Functor,Susp].
generate_insert_constraint_call(FA,Susp,Call) :-
make_name('$insert_in_store_',FA,Functor),
Call =.. [Functor,Susp].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
generate_attach_code(Constraints,[Enumerate|L]) :-
enumerate_stores_code(Constraints,Enumerate),
generate_attach_code(Constraints,L,[]).
generate_attach_code([],L,L).
generate_attach_code([C|Cs],L,T) :-
get_store_type(C,StoreType),
generate_attach_code(StoreType,C,L,L1),
generate_attach_code(Cs,L1,T).
generate_attach_code(default,_,L,L).
generate_attach_code(multi_hash(Indexes),C,L,T) :-
multi_hash_store_initialisations(Indexes,C,L,L1),
multi_hash_via_lookups(Indexes,C,L1,T).
generate_attach_code(global_ground,C,L,T) :-
global_ground_store_initialisation(C,L,T).
generate_attach_code(global_singleton,C,L,T) :-
global_singleton_store_initialisation(C,L,T).
generate_attach_code(multi_store(StoreTypes),C,L,T) :-
multi_store_generate_attach_code(StoreTypes,C,L,T).
multi_store_generate_attach_code([],_,L,L).
multi_store_generate_attach_code([ST|STs],C,L,T) :-
generate_attach_code(ST,C,L,L1),
multi_store_generate_attach_code(STs,C,L1,T).
multi_hash_store_initialisations([],_,L,L).
multi_hash_store_initialisations([Index|Indexes],FA,L,T) :-
multi_hash_store_name(FA,Index,StoreName),
L = [(:- (new_ht(HT),nb_setval(StoreName,HT)) )|L1],
multi_hash_store_initialisations(Indexes,FA,L1,T).
global_ground_store_initialisation(C,L,T) :-
global_ground_store_name(C,StoreName),
L = [(:- nb_setval(StoreName,[]))|T].
global_singleton_store_initialisation(C,L,T) :-
global_singleton_store_name(C,StoreName),
L = [(:- nb_setval(StoreName,[]))|T].
multi_hash_via_lookups([],_,L,L).
multi_hash_via_lookups([Index|Indexes],C,L,T) :-
multi_hash_via_lookup_name(C,Index,PredName),
Head =.. [PredName,Key,SuspsList],
multi_hash_store_name(C,Index,StoreName),
Body =
(
nb_getval(StoreName,HT),
lookup_ht(HT,Key,SuspsList)
),
L = [(Head :- Body)|L1],
multi_hash_via_lookups(Indexes,C,L1,T).
multi_hash_via_lookup_name(F/A,Index,Name) :-
( integer(Index) ->
IndexName = Index
; is_list(Index) ->
atom_concat_list(Index,IndexName)
),
atom_concat_list(['$via1_multi_hash_',F,(/),A,'-',IndexName],Name).
multi_hash_store_name(F/A,Index,Name) :-
get_target_module(Mod),
( integer(Index) ->
IndexName = Index
; is_list(Index) ->
atom_concat_list(Index,IndexName)
),
atom_concat_list(['$chr_store_multi_hash_',Mod,(:),F,(/),A,'-',IndexName],Name).
multi_hash_key(F/A,Index,Susp,KeyBody,Key) :-
( ( integer(Index) ->
I = Index
;
Index = [I]
) ->
SuspIndex is I + 6,
KeyBody = arg(SuspIndex,Susp,Key)
; is_list(Index) ->
sort(Index,Indexes),
find_with_var_identity(arg(J,Susp,KeyI)-KeyI,[Susp],(member(I,Indexes),J is I + 6),ArgKeyPairs),
pairup(Bodies,Keys,ArgKeyPairs),
Key =.. [k|Keys],
list2conj(Bodies,KeyBody)
).
multi_hash_key_args(Index,Head,KeyArgs) :-
( integer(Index) ->
arg(Index,Head,Arg),
KeyArgs = [Arg]
; is_list(Index) ->
sort(Index,Indexes),
term_variables(Head,Vars),
find_with_var_identity(Arg,Vars,(member(I,Indexes), arg(I,Head,Arg)),KeyArgs)
).
global_ground_store_name(F/A,Name) :-
get_target_module(Mod),
atom_concat_list(['$chr_store_global_ground_',Mod,(:),F,(/),A],Name).
global_singleton_store_name(F/A,Name) :-
get_target_module(Mod),
atom_concat_list(['$chr_store_global_singleton_',Mod,(:),F,(/),A],Name).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
enumerate_stores_code(Constraints,Clause) :-
Head = '$enumerate_suspensions'(Susp),
enumerate_store_bodies(Constraints,Susp,Bodies),
list2disj(Bodies,Body),
Clause = (Head :- Body).
enumerate_store_bodies([],_,[]).
enumerate_store_bodies([C|Cs],Susp,L) :-
( is_stored(C) ->
get_store_type(C,StoreType),
enumerate_store_body(StoreType,C,Susp,B),
L = [B|T]
;
L = T
),
enumerate_store_bodies(Cs,Susp,T).
enumerate_store_body(default,C,Susp,Body) :-
get_constraint_index(C,Index),
get_target_module(Mod),
get_max_constraint_index(MaxIndex),
Body1 =
(
'chr global_term_ref_1'(GlobalStore),
get_attr(GlobalStore,Mod,Attr)
),
( MaxIndex > 1 ->
NIndex is Index + 1,
Body2 =
(
arg(NIndex,Attr,List),
'chr sbag_member'(Susp,List)
)
;
Body2 = 'chr sbag_member'(Susp,Attr)
),
Body = (Body1,Body2).
enumerate_store_body(multi_hash([Index|_]),C,Susp,Body) :-
multi_hash_enumerate_store_body(Index,C,Susp,Body).
enumerate_store_body(global_ground,C,Susp,Body) :-
global_ground_store_name(C,StoreName),
Body =
(
nb_getval(StoreName,List),
'chr sbag_member'(Susp,List)
).
enumerate_store_body(global_singleton,C,Susp,Body) :-
global_singleton_store_name(C,StoreName),
Body =
(
nb_getval(StoreName,Susp),
Susp \== []
).
enumerate_store_body(multi_store(STs),C,Susp,Body) :-
once((
member(ST,STs),
enumerate_store_body(ST,C,Susp,Body)
)).
multi_hash_enumerate_store_body(I,C,Susp,B) :-
multi_hash_store_name(C,I,StoreName),
B =
(
nb_getval(StoreName,HT),
value_ht(HT,Susp)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- constraints
prev_guard_list/7,
simplify_guards/1,
set_all_passive/1.
option(mode,prev_guard_list(+,+,+,+,+,+,+)).
option(mode,simplify_guards(+)).
option(mode,set_all_passive(+)).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% GUARD SIMPLIFICATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% If the negation of the guards of earlier rules entails (part of)
% the current guard, the current guard can be simplified. We can only
% use earlier rules with a head that matches if the head of the current
% rule does, and which make it impossible for the current rule to match
% if they fire (i.e. they shouldn't be propagation rules and their
% head constraints must be subsets of those of the current rule).
% At this point, we know for sure that the negation of the guard
% of such a rule has to be true (otherwise the earlier rule would have
% fired, because of the refined operational semantics), so we can use
% that information to simplify the guard by replacing all entailed
% conditions by true/0. As a consequence, the never-stored analysis
% (in a further phase) will detect more cases of never-stored constraints.
%
% e.g. c(X),d(Y) <=> X > 0 | ...
% e(X) <=> X < 0 | ...
% c(X) \ d(Y),e(Z) <=> X =< 0, Z >= 0, ... | ...
% \____________/
% true
guard_simplification :-
( chr_pp_flag(guard_simplification,on) ->
multiple_occ_constraints_checked([]),
simplify_guards(1)
;
true
).
% for every rule, we create a prev_guard_list where the last argument
% eventually is a list of the negations of earlier guards
rule(RuleNb,Rule) \ simplify_guards(RuleNb) <=>
Rule = pragma(rule(Head1,Head2,G,_B),_Ids,_Pragmas,_Name,RuleNb),
append(Head1,Head2,Heads),
make_head_matchings_explicit_not_negated(Heads,UniqueVarsHeads,Matchings),
add_guard_to_head(Heads,G,GHeads),
PrevRule is RuleNb-1,
prev_guard_list(RuleNb,PrevRule,UniqueVarsHeads,G,[],Matchings,[GHeads]),
multiple_occ_constraints_checked([]),
NextRule is RuleNb+1, simplify_guards(NextRule).
simplify_guards(_) <=> true.
% the negation of the guard of a non-propagation rule is added
% if its kept head constraints are a subset of the kept constraints of
% the rule we're working on, and its removed head constraints (at least one)
% are a subset of the removed constraints
rule(N,Rule) \ prev_guard_list(RuleNb,N,H,G,GuardList,M,GH) <=>
Rule = pragma(rule(H1,H2,G2,_B),_Ids,_Pragmas,_Name,N),
H1 \== [],
append(H1,H2,Heads),
make_head_matchings_explicit(Heads,UniqueVarsHeads,Matchings),
term_variables(UniqueVarsHeads+H,HVars),
strip_attributes(HVars,HVarAttrs), % this seems to be necessairy to get past the setof
setof(Renaming,chr_translate:head_subset(UniqueVarsHeads,H,Renaming),Renamings),
restore_attributes(HVars,HVarAttrs),
Renamings \= []
|
compute_derived_info(Matchings,Renamings,UniqueVarsHeads,Heads,G2,M,H,GH,DerivedInfo,GH_New1),
append(GuardList,DerivedInfo,GL1),
list2conj(GL1,GL_),
conj2list(GL_,GL),
append(GH_New1,GH,GH1),
list2conj(GH1,GH_),
conj2list(GH_,GH_New),
N1 is N-1,
prev_guard_list(RuleNb,N1,H,G,GL,M,GH_New).
% if this isn't the case, we skip this one and try the next rule
prev_guard_list(RuleNb,N,H,G,GuardList,M,GH) <=> N > 0 |
N1 is N-1, prev_guard_list(RuleNb,N1,H,G,GuardList,M,GH).
prev_guard_list(RuleNb,0,H,G,GuardList,M,GH) <=>
GH \== [] |
add_type_information_(H,GH,TypeInfo),
conj2list(TypeInfo,TI),
term_variables(H,HeadVars),
append([chr_pp_headvariables(HeadVars)|TI],GuardList,Info),
list2conj(Info,InfoC),
conj2list(InfoC,InfoL),
prev_guard_list(RuleNb,0,H,G,InfoL,M,[]).
add_type_information_(H,[],true) :- !.
add_type_information_(H,[GH|GHs],TI) :- !,
add_type_information(H,GH,TI1),
TI = (TI1, TI2),
add_type_information_(H,GHs,TI2).
% when all earlier guards are added or skipped, we simplify the guard.
% if it's different from the original one, we change the rule
prev_guard_list(RuleNb,0,H,G,GuardList,M,[]), rule(RuleNb,Rule) <=>
Rule = pragma(rule(Head1,Head2,G,B),Ids,Pragmas,Name,RuleNb),
G \== true, % let's not try to simplify this ;)
append(M,GuardList,Info),
simplify_guard(G,B,Info,SimpleGuard,NB),
G \== SimpleGuard |
% ( prolog_flag(verbose,V), V == yes ->
% format(' * Guard simplification in ~@\n',[format_rule(Rule)]),
% format(' was: ~w\n',[G]),
% format(' now: ~w\n',[SimpleGuard]),
% (NB\==B -> format(' new body: ~w\n',[NB]) ; true)
% ;
% true
% ),
rule(RuleNb,pragma(rule(Head1,Head2,SimpleGuard,NB),Ids,Pragmas,Name,RuleNb)),
prev_guard_list(RuleNb,0,H,SimpleGuard,GuardList,M,[]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% AUXILIARY PREDICATES (GUARD SIMPLIFICATION)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
compute_derived_info(Matchings,[],UniqueVarsHeads,Heads,G2,M,H,GH,[],[]) :- !.
compute_derived_info(Matchings,[Renaming1|RR],UniqueVarsHeads,Heads,G2,M,H,GH,DerivedInfo,GH_New) :- !,
copy_term(Matchings-G2,FreshMatchings),
variable_replacement(Matchings-G2,FreshMatchings,ExtraRenaming),
append(Renaming1,ExtraRenaming,Renaming2),
list2conj(Matchings,Match),
negate_b(Match,HeadsDontMatch),
make_head_matchings_explicit_not_negated2(Heads,UniqueVarsHeads,HeadsMatch),
list2conj(HeadsMatch,HeadsMatchBut),
term_variables(Renaming2,RenVars),
term_variables(Matchings-G2-HeadsMatch,MGVars),
new_vars(MGVars,RenVars,ExtraRenaming2),
append(Renaming2,ExtraRenaming2,Renaming),
negate_b(G2,TheGuardFailed),
( G2 == true -> % true can't fail
Info_ = HeadsDontMatch
;
Info_ = (HeadsDontMatch ; (HeadsMatchBut, TheGuardFailed))
),
copy_with_variable_replacement(Info_,DerivedInfo1,Renaming),
copy_with_variable_replacement(G2,RenamedG2,Renaming),
copy_with_variable_replacement(Matchings,RenamedMatchings_,Renaming),
list2conj(RenamedMatchings_,RenamedMatchings),
add_guard_to_head(H,RenamedG2,GH2),
add_guard_to_head(GH2,RenamedMatchings,GH3),
compute_derived_info(Matchings,RR,UniqueVarsHeads,Heads,G2,M,H,GH,DerivedInfo2,GH_New2),
append([DerivedInfo1],DerivedInfo2,DerivedInfo),
append([GH3],GH_New2,GH_New).
simplify_guard(G,B,Info,SG,NB) :-
conj2list(G,LG),
guard_entailment:simplify_guards(Info,B,LG,SGL,NB),
list2conj(SGL,SG).
new_vars([],_,[]).
new_vars([A|As],RV,ER) :-
( memberchk_eq(A,RV) ->
new_vars(As,RV,ER)
;
ER = [A-NewA,NewA-A|ER2],
new_vars(As,RV,ER2)
).
% check if a list of constraints is a subset of another list of constraints
% (multiset-subset), meanwhile computing a variable renaming to convert
% one into the other.
head_subset(H,Head,Renaming) :-
head_subset(H,Head,Renaming,[],_).
% empty list is a subset of everything
head_subset([],Head,Renaming,Cumul,Headleft) :- !,
Renaming = Cumul,
Headleft = Head.
% first constraint has to be in the list, the rest has to be a subset
% of the list with one occurrence of the first constraint removed
% (has to be multiset-subset)
head_subset([A|B],Head,Renaming,Cumul,Headleft) :- !,
head_subset(A,Head,R1,Cumul,Headleft1),
head_subset(B,Headleft1,R2,R1,Headleft2),
Renaming = R2,
Headleft = Headleft2.
% check if A is in the list, remove it from Headleft
head_subset(A,[X|Y],Renaming,Cumul,Headleft) :- !,
( head_subset(A,X,R1,Cumul,HL1),
Renaming = R1,
Headleft = Y
;
head_subset(A,Y,R2,Cumul,HL2),
Renaming = R2,
Headleft = [X|HL2]
).
% A is X if there's a variable renaming to make them identical
head_subset(A,X,Renaming,Cumul,Headleft) :-
variable_replacement(A,X,Cumul,Renaming),
Headleft = [].
make_head_matchings_explicit(Heads,UniqueVarsHeads,Matchings) :-
extract_variables(Heads,VH1),
make_matchings_explicit(VH1,H1_,[],[],_,Matchings),
insert_variables(H1_,Heads,UniqueVarsHeads).
make_head_matchings_explicit_not_negated(Heads,UniqueVarsHeads,Matchings) :-
extract_variables(Heads,VH1),
make_matchings_explicit_not_negated(VH1,H1_,[],Matchings),
insert_variables(H1_,Heads,UniqueVarsHeads).
make_head_matchings_explicit_not_negated2(Heads,UniqueVarsHeads,Matchings) :-
extract_variables(Heads,VH1),
extract_variables(UniqueVarsHeads,UV),
make_matchings_explicit_not_negated(VH1,UV,[],Matchings).
extract_variables([],[]).
extract_variables([X|R],V) :-
X =.. [_|Args],
extract_variables(R,V2),
append(Args,V2,V).
insert_variables([],[],[]) :- !.
insert_variables(Vars,[C|R],[C2|R2]) :-
C =.. [F | Args],
length(Args,N),
take_first_N(Vars,N,Args2,RestVars),
C2 =.. [F | Args2],
insert_variables(RestVars,R,R2).
take_first_N(Vars,0,[],Vars) :- !.
take_first_N([X|R],N,[X|R2],RestVars) :-
N1 is N-1,
take_first_N(R,N1,R2,RestVars).
make_matchings_explicit([],[],_,MC,MC,[]).
make_matchings_explicit([X|R],[NewVar|R2],C,MC,MCO,M) :-
( var(X) ->
( memberchk_eq(X,C) ->
list2disj(MC,MC_disj),
M = [(MC_disj ; NewVar == X)|M2], % or only = ??
C2 = C
;
M = M2,
NewVar = X,
C2 = [X|C]
),
MC2 = MC
;
functor(X,F,A),
X =.. [F|Args],
make_matchings_explicit(Args,NewArgs,C,MC,MC_,ArgM),
X_ =.. [F|NewArgs],
(ArgM == [] ->
M = [functor(NewVar,F,A) |M2]
;
list2conj(ArgM,ArgM_conj),
list2disj(MC,MC_disj),
ArgM_ = (NewVar \= X_ ; MC_disj ; ArgM_conj),
M = [ functor(NewVar,F,A) , ArgM_|M2]
),
MC2 = [ NewVar \= X_ |MC_],
term_variables(Args,ArgVars),
append(C,ArgVars,C2)
),
make_matchings_explicit(R,R2,C2,MC2,MCO,M2).
make_matchings_explicit_not_negated([],[],_,[]).
make_matchings_explicit_not_negated([X|R],[NewVar|R2],C,M) :-
M = [NewVar = X|M2],
C2 = C,
make_matchings_explicit_not_negated(R,R2,C2,M2).
add_guard_to_head([],G,[]).
add_guard_to_head([H|RH],G,[GH|RGH]) :-
(var(H) ->
find_guard_info_for_var(H,G,GH)
;
functor(H,F,A),
H =.. [F|HArgs],
add_guard_to_head(HArgs,G,NewHArgs),
GH =.. [F|NewHArgs]
),
add_guard_to_head(RH,G,RGH).
find_guard_info_for_var(H,(G1,G2),GH) :- !,
find_guard_info_for_var(H,G1,GH1),
find_guard_info_for_var(GH1,G2,GH).
find_guard_info_for_var(H,G,GH) :-
(G = (H1 = A), H == H1 ->
GH = A
;
(G = functor(H2,HF,HA), H == H2, ground(HF), ground(HA) ->
length(GHArg,HA),
GH =.. [HF|GHArg]
;
GH = H
)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% ALWAYS FAILING HEADS
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
rule(RuleNb,Rule) \ prev_guard_list(RuleNb,0,H,G,GuardList,M,[]) <=>
chr_pp_flag(check_impossible_rules,on),
Rule = pragma(rule(Head1,Head2,G,B),Ids,Pragmas,Name,RuleNb),
append(M,GuardList,Info),
guard_entailment:entails_guard(Info,fail) |
format('CHR compiler WARNING: heads will never match in ~@.\n',[format_rule(Rule)]),
format(' `--> In the refined operational semantics (rules applied in textual order)\n',[]),
format(' this rule will never fire! (given the declared types/modes)\n',[]),
format(' Removing this redundant rule by making all its heads passive...\n',[]),
format(' ... next warning is caused by this ...\n',[]),
set_all_passive(RuleNb).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% HEAD SIMPLIFICATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% now we check the head matchings (guard may have been simplified meanwhile)
prev_guard_list(RuleNb,0,H,G,GuardList,M,[]) \ rule(RuleNb,Rule) <=>
Rule = pragma(rule(Head1,Head2,G,B),Ids,Pragmas,Name,RuleNb),
simplify_heads(M,GuardList,G,B,NewM,NewB),
NewM \== [],
extract_variables(Head1,VH1),
extract_variables(Head2,VH2),
extract_variables(H,VH),
replace_some_heads(VH1,VH2,VH,NewM,H1,H2,G,B,NewB_),
insert_variables(H1,Head1,NewH1),
insert_variables(H2,Head2,NewH2),
append(NewB,NewB_,NewBody),
list2conj(NewBody,BodyMatchings),
NewRule = pragma(rule(NewH1,NewH2,G,(BodyMatchings,B)),Ids,Pragmas,Name,RuleNb),
(Head1 \== NewH1 ; Head2 \== NewH2 )
|
% ( prolog_flag(verbose,V), V == yes ->
% format(' * Head simplification in ~@\n',[format_rule(Rule)]),
% format(' was: ~w \\ ~w \n',[Head2,Head1]),
% format(' now: ~w \\ ~w \n',[NewH2,NewH1]),
% format(' extra body: ~w \n',[BodyMatchings])
% ;
% true
% ),
rule(RuleNb,NewRule).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% AUXILIARY PREDICATES (HEAD SIMPLIFICATION)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
replace_some_heads(H1,H2,NH,[],H1,H2,G,Body,[]) :- !.
replace_some_heads([],[H2|RH2],[NH|RNH],[M|RM],[],[H2_|RH2_],G,Body,NewB) :- !,
( NH == M ->
H2_ = M,
replace_some_heads([],RH2,RNH,RM,[],RH2_,G,Body,NewB)
;
(M = functor(X,F,A), NH == X ->
length(A_args,A),
(var(H2) ->
NewB1 = [],
H2_ =.. [F|A_args]
;
H2 =.. [F|OrigArgs],
use_same_args(OrigArgs,A_args,A_args_,G,Body,NewB1),
H2_ =.. [F|A_args_]
),
replace_some_heads([],RH2,RNH,RM,[],RH2_,G,Body,NewB2),
append(NewB1,NewB2,NewB)
;
H2_ = H2,
replace_some_heads([],RH2,RNH,[M|RM],[],RH2_,G,Body,NewB)
)
).
replace_some_heads([H1|RH1],H2,[NH|RNH],[M|RM],[H1_|RH1_],H2_,G,Body,NewB) :- !,
( NH == M ->
H1_ = M,
replace_some_heads(RH1,H2,RNH,RM,RH1_,H2_,G,Body,NewB)
;
(M = functor(X,F,A), NH == X ->
length(A_args,A),
(var(H1) ->
NewB1 = [],
H1_ =.. [F|A_args]
;
H1 =.. [F|OrigArgs],
use_same_args(OrigArgs,A_args,A_args_,G,Body,NewB1),
H1_ =.. [F|A_args_]
),
replace_some_heads(RH1,H2,RNH,RM,RH1_,H2_,G,Body,NewB2),
append(NewB1,NewB2,NewB)
;
H1_ = H1,
replace_some_heads(RH1,H2,RNH,[M|RM],RH1_,H2_,G,Body,NewB)
)
).
use_same_args([],[],[],_,_,[]).
use_same_args([OA|ROA],[NA|RNA],[Out|ROut],G,Body,NewB) :-
var(OA),!,
Out = OA,
use_same_args(ROA,RNA,ROut,G,Body,NewB).
use_same_args([OA|ROA],[NA|RNA],[Out|ROut],G,Body,NewB) :-
nonvar(OA),!,
( vars_occur_in(OA,Body) ->
NewB = [NA = OA|NextB]
;
NewB = NextB
),
Out = NA,
use_same_args(ROA,RNA,ROut,G,Body,NextB).
simplify_heads([],_GuardList,_G,_Body,[],[]).
simplify_heads([M|RM],GuardList,G,Body,NewM,NewB) :-
M = (A = B),
( (nonvar(B) ; vars_occur_in(B,RM-GuardList)),
guard_entailment:entails_guard(GuardList,(A=B)) ->
( vars_occur_in(B,G-RM-GuardList) ->
NewB = NextB,
NewM = NextM
;
( vars_occur_in(B,Body) ->
NewB = [A = B|NextB]
;
NewB = NextB
),
NewM = [A|NextM]
)
;
( nonvar(B), functor(B,BFu,BAr),
guard_entailment:entails_guard([functor(A,BFu,BAr)|GuardList],(A=B)) ->
NewB = NextB,
( vars_occur_in(B,G-RM-GuardList) ->
NewM = NextM
;
NewM = [functor(A,BFu,BAr)|NextM]
)
;
NewM = NextM,
NewB = NextB
)
),
simplify_heads(RM,[M|GuardList],G,Body,NextM,NextB).
vars_occur_in(B,G) :-
term_variables(B,BVars),
term_variables(G,GVars),
intersect_eq(BVars,GVars,L),
L \== [].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% ALWAYS FAILING GUARDS
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
set_all_passive(RuleNb), occurrence(_,_,RuleNb,ID) ==> passive(RuleNb,ID).
set_all_passive(_) <=> true.
prev_guard_list(RuleNb,0,H,G,GuardList,M,[]),rule(RuleNb,Rule) ==>
chr_pp_flag(check_impossible_rules,on),
Rule = pragma(rule(_,_,G,_),_Ids,_Pragmas,_Name,RuleNb),
conj2list(G,GL),
guard_entailment:entails_guard(GL,fail) |
format('CHR compiler WARNING: guard will always fail in ~@.\n',[format_rule(Rule)]),
format(' Removing this redundant rule by making all its heads passive...\n',[]),
format(' ... next warning is caused by this ...\n',[]),
set_all_passive(RuleNb).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% OCCURRENCE SUBSUMPTION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- constraints
first_occ_in_rule/4,
next_occ_in_rule/6,
multiple_occ_constraints_checked/1.
option(mode,first_occ_in_rule(+,+,+,+)).
option(mode,next_occ_in_rule(+,+,+,+,+,+)).
option(mode,multiple_occ_constraints_checked(+)).
prev_guard_list(RuleNb,0,H,G,GuardList,M,[]),
occurrence(C,O,RuleNb,ID), occurrence(C,O2,RuleNb,ID2), rule(RuleNb,Rule)
\ multiple_occ_constraints_checked(Done) <=>
O < O2,
chr_pp_flag(occurrence_subsumption,on),
Rule = pragma(rule(H1,H2,_G,_B),_Ids,_Pragmas,_Name,RuleNb),
H1 \== [],
\+ memberchk_eq(C,Done) |
first_occ_in_rule(RuleNb,C,O,ID),
multiple_occ_constraints_checked([C|Done]).
occurrence(C,O,RuleNb,ID) \ first_occ_in_rule(RuleNb,C,O2,_) <=> O < O2 |
first_occ_in_rule(RuleNb,C,O,ID).
first_occ_in_rule(RuleNb,C,O,ID_o1) <=>
C = F/A,
functor(FreshHead,F,A),
next_occ_in_rule(RuleNb,C,O,ID_o1,[],FreshHead).
passive(RuleNb,ID_o2), occurrence(C,O2,RuleNb,ID_o2)
\ next_occ_in_rule(RuleNb,C,O,ID_o1,Cond,FH) <=> O2 is O+1 |
next_occ_in_rule(RuleNb,C,O2,ID_o1,NewCond,FH).
prev_guard_list(RuleNb,0,H,G,GuardList,M,[]),
occurrence(C,O2,RuleNb,ID_o2), rule(RuleNb,Rule) \
next_occ_in_rule(RuleNb,C,O,ID_o1,Cond,FH) <=>
O2 is O+1,
Rule = pragma(rule(H1,H2,G,B),ids(ID1,ID2),_Pragmas,_Name,RuleNb)
|
append(H1,H2,Heads),
add_failing_occ(Rule,Heads,H,ID_o1,ExtraCond,FH,M,C,Repl),
( ExtraCond == [chr_pp_void_info] ->
next_occ_in_rule(RuleNb,C,O2,ID_o2,Cond,FH)
;
append(ExtraCond,Cond,NewCond),
add_failing_occ(Rule,Heads,H,ID_o2,CheckCond,FH,M,C,Repl2),
copy_term(GuardList,FGuardList),
variable_replacement(GuardList,FGuardList,GLRepl),
copy_with_variable_replacement(GuardList,GuardList2,Repl),
copy_with_variable_replacement(GuardList,GuardList3_,Repl2),
copy_with_variable_replacement(GuardList3_,GuardList3,GLRepl),
append(NewCond,GuardList2,BigCond),
append(BigCond,GuardList3,BigCond2),
copy_with_variable_replacement(M,M2,Repl),
copy_with_variable_replacement(M,M3,Repl2),
append(M3,BigCond2,BigCond3),
append([chr_pp_active_constraint(FH)|M2],BigCond3,Info),
list2conj(CheckCond,OccSubsum),
copy_term((NewCond,BigCond2,Info,OccSubsum,FH),(NewCond2,BigCond2_,Info2,OccSubsum2,FH2)),
term_variables(NewCond2-FH2,InfoVars),
flatten_stuff(Info2,Info3),
flatten_stuff(OccSubsum2,OccSubsum3),
( OccSubsum \= chr_pp_void_info,
unify_stuff(InfoVars,Info3,OccSubsum3), !,
( guard_entailment:entails_guard(Info2,OccSubsum2) ->
% ( prolog_flag(verbose,V), V == yes ->
% format(' * Occurrence subsumption detected in ~@\n',[format_rule(Rule)]),
% format(' passive: constraint ~w, occurrence number ~w (id ~w)\n',[C,O2,ID_o2]),
% ;
% true
% ),
passive(RuleNb,ID_o2)
;
true
)
; true
),!,
next_occ_in_rule(RuleNb,C,O2,ID_o2,NewCond,FH)
).
next_occ_in_rule(RuleNb,C,O,ID,Cond,Args) <=> true.
prev_guard_list(RuleNb,0,H,G,GuardList,M,[]),
multiple_occ_constraints_checked(Done) <=> true.
flatten_stuff([A|B],C) :- !,
flatten_stuff(A,C1),
flatten_stuff(B,C2),
append(C1,C2,C).
flatten_stuff((A;B),C) :- !,
flatten_stuff(A,C1),
flatten_stuff(B,C2),
append(C1,C2,C).
flatten_stuff((A,B),C) :- !,
flatten_stuff(A,C1),
flatten_stuff(B,C2),
append(C1,C2,C).
flatten_stuff(chr_pp_not_in_store(A),[A]) :- !.
flatten_stuff(X,[]).
unify_stuff(AllInfo,[],[]).
unify_stuff(AllInfo,[H|RInfo],[I|ROS]) :-
H \== I,
term_variables(H,HVars),
term_variables(I,IVars),
intersect_eq(HVars,IVars,SharedVars),
check_safe_unif(H,I,SharedVars),
variable_replacement(H,I,Repl),
check_replacement(Repl),
term_variables(Repl,ReplVars),
list_difference_eq(ReplVars,HVars,LDiff),
intersect_eq(AllInfo,LDiff,LDiff2),
LDiff2 == [],
H = I,
unify_stuff(AllInfo,RInfo,ROS),!.
unify_stuff(AllInfo,X,[Y|ROS]) :-
unify_stuff(AllInfo,X,ROS).
unify_stuff(AllInfo,[Y|RInfo],X) :-
unify_stuff(AllInfo,RInfo,X).
check_safe_unif(H,I,SV) :- var(H), !, var(I),
( (memberchk_eq(H,SV);memberchk_eq(I,SV)) ->
H == I
;
true
).
check_safe_unif([],[],SV) :- !.
check_safe_unif([H|Hs],[I|Is],SV) :- !,
check_safe_unif(H,I,SV),!,
check_safe_unif(Hs,Is,SV).
check_safe_unif(H,I,SV) :-
nonvar(H),!,nonvar(I),
H =.. [F|HA],
I =.. [F|IA],
check_safe_unif(HA,IA,SV).
check_safe_unif2(H,I) :- var(H), !.
check_safe_unif2([],[]) :- !.
check_safe_unif2([H|Hs],[I|Is]) :- !,
check_safe_unif2(H,I),!,
check_safe_unif2(Hs,Is).
check_safe_unif2(H,I) :-
nonvar(H),!,nonvar(I),
H =.. [F|HA],
I =.. [F|IA],
check_safe_unif2(HA,IA).
check_replacement(Repl) :-
check_replacement(Repl,FirstVars),
sort(FirstVars,Sorted),
length(Sorted,L),!,
length(FirstVars,L).
check_replacement([],[]).
check_replacement([A-B|R],[A|RC]) :- check_replacement(R,RC).
add_failing_occ(Rule,Heads,NH,ID_o1,FailCond,FH,M,C,Repl) :-
Rule = pragma(rule(H1,H2,G,B),ids(ID1,ID2),_Pragmas,_Name,RuleNb),
append(ID2,ID1,IDs),
missing_partner_cond(Heads,NH,IDs,ID_o1,MPCond,H,C),
copy_term((H,Heads,NH),(FH2,FHeads,NH2)),
variable_replacement((H,Heads,NH),(FH2,FHeads,NH2),Repl),
copy_with_variable_replacement(G,FG,Repl),
extract_explicit_matchings(FG,FG2),
negate_b(FG2,NotFG),
copy_with_variable_replacement(MPCond,FMPCond,Repl),
( check_safe_unif2(FH,FH2), FH=FH2 ->
FailCond = [(NotFG;FMPCond)]
;
% in this case, not much can be done
% e.g. c(f(...)), c(g(...)) <=> ...
FailCond = [chr_pp_void_info]
).
missing_partner_cond([],[],[],ID_o1,fail,H2,C).
missing_partner_cond([H|Hs],[H2|H2s],[ID_o1|IDs],ID_o1,Cond,H,C) :- !,
missing_partner_cond(Hs,H2s,IDs,ID_o1,Cond,H,C).
missing_partner_cond([H|Hs],[NH|NHs],[ID|IDs],ID_o1,Cond,H2,F/A) :-
Cond = (chr_pp_not_in_store(H);Cond1),
missing_partner_cond(Hs,NHs,IDs,ID_o1,Cond1,H2,F/A).
extract_explicit_matchings(A=B) :-
var(A), var(B), !, A=B.
extract_explicit_matchings(A==B) :-
var(A), var(B), !, A=B.
extract_explicit_matchings((A,B),D) :- !,
( extract_explicit_matchings(A) ->
extract_explicit_matchings(B,D)
;
D = (A,E),
extract_explicit_matchings(B,E)
).
extract_explicit_matchings(A,D) :- !,
( extract_explicit_matchings(A) ->
D = true
;
D = A
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% TYPE INFORMATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- constraints
type_definition/2,
constraint_type/2,
get_type_definition/2,
get_constraint_type/2,
add_type_information/3.
option(mode,type_definition(?,?)).
option(mode,constraint_type(+,+)).
option(mode,add_type_information(+,+,?)).
option(type_declaration,add_type_information(list,list,any)).
type_definition(T,D) \ get_type_definition(T2,Def) <=>
nonvar(T),nonvar(T2),functor(T,F,A),functor(T2,F,A) |
copy_term((T,D),(T1,D1)),T1=T2,Def = D1.
get_type_definition(_,_) <=> fail.
constraint_type(C,T) \ get_constraint_type(C,Type) <=> Type = T.
get_constraint_type(_,_) <=> fail.
add_type_information([],[],T) <=> T=true.
constraint_mode(F/A,Modes)
\ add_type_information([Head|R],[RealHead|RRH],TypeInfo) <=>
functor(Head,F,A) |
Head =.. [_|Args],
RealHead =.. [_|RealArgs],
add_mode_info(Modes,Args,ModeInfo),
TypeInfo = (ModeInfo, TI),
(get_constraint_type(F/A,Types) ->
types2condition(Types,Args,RealArgs,Modes,TI2),
list2conj(TI2,ConjTI),
TI = (ConjTI,RTI),
add_type_information(R,RRH,RTI)
;
add_type_information(R,RRH,TI)
).
add_type_information([Head|R],_,TypeInfo) <=>
functor(Head,F,A),
format('CHR compiler ERROR: mode information missing for ~w.\n',[F/A]),
format(' `--> Most likely this is a bug in the compiler itself.\n',[]),
format(' Please contact the maintainers.\n',[]),
fail.
add_mode_info([],[],true).
add_mode_info([(+)|Modes],[A|Args],MI) :- !,
MI = (ground(A), ModeInfo),
add_mode_info(Modes,Args,ModeInfo).
add_mode_info([M|Modes],[A|Args],MI) :-
add_mode_info(Modes,Args,MI).
types2condition([],[],[],[],[]).
types2condition([Type|Types],[Arg|Args],[RealArg|RAs],[Mode|Modes],TI) :-
(get_type_definition(Type,Def) ->
type2condition(Def,Arg,RealArg,TC),
(Mode \== (+) ->
TC_ = [(\+ ground(Arg))|TC]
;
TC_ = TC
),
list2disj(TC_,DisjTC),
TI = [DisjTC|RTI],
types2condition(Types,Args,RAs,Modes,RTI)
;
( builtin_type(Type,Arg,C) ->
TI = [C|RTI],
types2condition(Types,Args,RAs,Modes,RTI)
;
format('CHR compiler ERROR: Undefined type ~w.\n',[Type]),
fail
)
).
type2condition([],Arg,_,[]).
type2condition([Def|Defs],Arg,RealArg,TC) :-
( builtin_type(Def,Arg,C) ->
true
;
real_type(Def,Arg,RealArg,C)
),
item2list(C,LC),
type2condition(Defs,Arg,RealArg,RTC),
append(LC,RTC,TC).
item2list([],[]) :- !.
item2list([X|Y],[X|Y]) :- !.
item2list(N,L) :- L = [N].
builtin_type(X,Arg,true) :- var(X),!.
builtin_type(any,Arg,true).
builtin_type(int,Arg,integer(Arg)).
builtin_type(number,Arg,number(Arg)).
builtin_type(float,Arg,float(Arg)).
builtin_type(natural,Arg,(integer(Arg),Arg>=0)).
real_type(Def,Arg,RealArg,C) :-
( nonvar(Def) ->
functor(Def,F,A),
( A == 0 ->
C = (Arg = F)
;
Def =.. [_|TArgs],
length(AA,A),
Def2 =.. [F|AA],
( var(RealArg) ->
C = functor(Arg,F,A)
;
( functor(RealArg,F,A) ->
RealArg =.. [_|RAArgs],
nested_types(TArgs,AA,RAArgs,ACond),
C = (functor(Arg,F,A),Arg=Def2,ACond)
;
C = functor(Arg,F,A)
)
)
)
;
format('CHR compiler ERROR: Illegal type definition (must be nonvar).\n',[]),
fail
).
nested_types([],[],[],true).
nested_types([T|RT],[A|RA],[RealA|RRA],C) :-
(get_type_definition(T,Def) ->
type2condition(Def,A,RealA,TC),
list2disj(TC,DisjTC),
C = (DisjTC, RC),
nested_types(RT,RA,RRA,RC)
;
( builtin_type(T,A,Cond) ->
C = (Cond, RC),
nested_types(RT,RA,RRA,RC)
;
format('CHR compiler ERROR: Undefined type ~w inside type definition.\n',[T]),
fail
)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- constraints
stored/3, % constraint,occurrence,(yes/no/maybe)
stored_completing/3,
stored_complete/3,
is_stored/1,
is_finally_stored/1,
check_all_passive/2.
option(mode,stored(+,+,+)).
option(type_declaration,stored(any,int,storedinfo)).
option(type_definition,type(storedinfo,[yes,no,maybe])).
option(mode,stored_complete(+,+,+)).
option(mode,maybe_complementary_guards(+,+,?,?)).
option(mode,guard_list(+,+,+,+)).
option(mode,check_all_passive(+,+)).
% change yes in maybe when yes becomes passive
passive(RuleNb,ID), occurrence(C,O,RuleNb,ID) \
stored(C,O,yes), stored_complete(C,RO,Yesses)
<=> O < RO | NYesses is Yesses - 1,
stored(C,O,maybe), stored_complete(C,RO,NYesses).
% change yes in maybe when not observed
ai_not_observed(C,O) \ stored(C,O,yes), stored_complete(C,RO,Yesses)
<=> O < RO |
NYesses is Yesses - 1,
stored(C,O,maybe), stored_complete(C,RO,NYesses).
occurrence(_,_,RuleNb,ID), occurrence(C2,_,RuleNb,_), stored_complete(C2,RO,0), max_occurrence(C2,MO2)
==> RO =< MO2 | % C2 is never stored
passive(RuleNb,ID).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
rule(RuleNb,Rule),passive(RuleNb,Id) ==>
Rule = pragma(rule(Head1,Head2,G,B),ids([Id|IDs1],IDs2),Pragmas,Name,RuleNb) |
append(IDs1,IDs2,I), check_all_passive(RuleNb,I).
rule(RuleNb,Rule),passive(RuleNb,Id) ==>
Rule = pragma(rule(Head1,Head2,G,B),ids([],[Id|IDs2]),Pragmas,Name,RuleNb) |
check_all_passive(RuleNb,IDs2).
passive(RuleNb,Id) \ check_all_passive(RuleNb,[Id|IDs]) <=>
check_all_passive(RuleNb,IDs).
rule(RuleNb,Rule) \ check_all_passive(RuleNb,[]) <=>
format('CHR compiler WARNING: all heads passive in ~@.\n',[format_rule(Rule)]),
format(' `--> Rule never fires. Check your program, this might be a bug!\n',[]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% collect the storage information
stored(C,O,yes) \ stored_completing(C,O,Yesses)
<=> NO is O + 1, NYesses is Yesses + 1,
stored_completing(C,NO,NYesses).
stored(C,O,maybe) \ stored_completing(C,O,Yesses)
<=> NO is O + 1,
stored_completing(C,NO,Yesses).
stored(C,O,no) \ stored_completing(C,O,Yesses)
<=> stored_complete(C,O,Yesses).
stored_completing(C,O,Yesses)
<=> stored_complete(C,O,Yesses).
stored_complete(C,O,Yesses), occurrence(C,O2,RuleNb,Id) ==>
O2 > O | passive(RuleNb,Id).
% decide whether a constraint is stored
max_occurrence(C,MO), stored_complete(C,RO,0) \ is_stored(C)
<=> RO =< MO | fail.
is_stored(C) <=> true.
% decide whether a constraint is suspends after occurrences
max_occurrence(C,MO), stored_complete(C,RO,_) \ is_finally_stored(C)
<=> RO =< MO | fail.
is_finally_stored(C) <=> true.
storage_analysis(Constraints) :-
( chr_pp_flag(storage_analysis,on) ->
check_constraint_storages(Constraints)
;
true
).
check_constraint_storages([]).
check_constraint_storages([C|Cs]) :-
check_constraint_storage(C),
check_constraint_storages(Cs).
check_constraint_storage(C) :-
get_max_occurrence(C,MO),
check_occurrences_storage(C,1,MO).
check_occurrences_storage(C,O,MO) :-
( O > MO ->
stored_completing(C,1,0)
;
check_occurrence_storage(C,O),
NO is O + 1,
check_occurrences_storage(C,NO,MO)
).
check_occurrence_storage(C,O) :-
get_occurrence(C,O,RuleNb,ID),
( is_passive(RuleNb,ID) ->
stored(C,O,maybe)
;
get_rule(RuleNb,PragmaRule),
PragmaRule = pragma(rule(Heads1,Heads2,Guard,Body),ids(IDs1,IDs2),_,_,_),
( select2(ID,Head1,IDs1,Heads1,RIDs1,RHeads1) ->
check_storage_head1(Head1,O,Heads1,Heads2,Guard)
; select2(ID,Head2,IDs2,Heads2,RIDs2,RHeads2) ->
check_storage_head2(Head2,O,Heads1,Body)
)
).
check_storage_head1(Head,O,H1,H2,G) :-
functor(Head,F,A),
C = F/A,
( H1 == [Head],
H2 == [],
guard_entailment:entails_guard([chr_pp_headvariables(Head)],G),
Head =.. [_|L],
no_matching(L,[]) ->
stored(C,O,no)
;
stored(C,O,maybe)
).
no_matching([],_).
no_matching([X|Xs],Prev) :-
var(X),
\+ memberchk_eq(X,Prev),
no_matching(Xs,[X|Prev]).
check_storage_head2(Head,O,H1,B) :-
functor(Head,F,A),
C = F/A,
( ( (H1 \== [], B == true ) ;
\+ is_observed(F/A,O) ) ->
stored(C,O,maybe)
;
stored(C,O,yes)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ____ _ ____ _ _ _ _
%% | _ \ _ _| | ___ / ___|___ _ __ ___ _ __ (_) | __ _| |_(_) ___ _ __
%% | |_) | | | | |/ _ \ | | / _ \| '_ ` _ \| '_ \| | |/ _` | __| |/ _ \| '_ \
%% | _ <| |_| | | __/ | |__| (_) | | | | | | |_) | | | (_| | |_| | (_) | | | |
%% |_| \_\\__,_|_|\___| \____\___/|_| |_| |_| .__/|_|_|\__,_|\__|_|\___/|_| |_|
%% |_|
constraints_code(Constraints,Clauses) :-
constraints_code1(Constraints,L,[]),
clean_clauses(L,Clauses).
%===============================================================================
constraints constraints_code1/3.
option(mode,constraints_code1(+,+,+)).
%-------------------------------------------------------------------------------
constraints_code1([],L,T) <=> L = T.
constraints_code1([C|RCs],L,T)
<=>
constraint_code(C,L,T1),
constraints_code1(RCs,T1,T).
%===============================================================================
constraints constraint_code/3.
option(mode,constraint_code(+,+,+)).
%-------------------------------------------------------------------------------
%% Generate code for a single CHR constraint
constraint_code(Constraint, L, T)
<=> true
| ( (chr_pp_flag(debugable,on) ;
is_stored(Constraint), ( has_active_occurrence(Constraint); chr_pp_flag(late_allocation,off)),
( may_trigger(Constraint) ;
get_allocation_occurrence(Constraint,AO),
get_max_occurrence(Constraint,MO), MO >= AO ) )
->
constraint_prelude(Constraint,Clause),
L = [Clause | L1]
;
L = L1
),
Id = [0],
occurrences_code(Constraint,1,Id,NId,L1,L2),
gen_cond_attach_clause(Constraint,NId,L2,T).
%===============================================================================
%% Generate prelude predicate for a constraint.
%% f(...) :- f/a_0(...,Susp).
constraint_prelude(F/A, Clause) :-
vars_susp(A,Vars,Susp,VarsSusp),
Head =.. [ F | Vars],
build_head(F,A,[0],VarsSusp,Delegate),
get_target_module(Mod),
FTerm =.. [F|Vars],
( chr_pp_flag(debugable,on) ->
use_auxiliary_predicate(insert_constraint_internal),
generate_insert_constraint_call(F/A,Susp,InsertCall),
make_name('attach_',F/A,AttachF),
AttachCall =.. [AttachF,Vars2,Susp],
Inactive = (arg(2,Susp,Mutable), 'chr update_mutable'(inactive,Mutable)),
Clause =
( Head :-
insert_constraint_internal(Stored,Vars2,Susp,Mod:Delegate,FTerm,Vars),
InsertCall,
AttachCall,
Inactive,
(
'chr debug_event'(call(Susp)),
Delegate
;
'chr debug_event'(fail(Susp)), !,
fail
),
(
'chr debug_event'(exit(Susp))
;
'chr debug_event'(redo(Susp)),
fail
)
)
; get_allocation_occurrence(F/A,0) ->
gen_insert_constraint_internal_goal(F/A,Goal,VarsSusp,Vars,Susp),
Inactive = (arg(2,Susp,Mutable), 'chr update_mutable'(inactive,Mutable)),
Clause = ( Head :- Goal, Inactive, Delegate )
;
Clause = ( Head :- Delegate )
).
%===============================================================================
constraints has_active_occurrence/1, has_active_occurrence/2.
%-------------------------------------------------------------------------------
has_active_occurrence(C) <=> has_active_occurrence(C,1).
max_occurrence(C,MO) \ has_active_occurrence(C,O) <=>
O > MO | fail.
passive(RuleNb,ID),occurrence(C,O,RuleNb,ID) \
has_active_occurrence(C,O) <=>
NO is O + 1,
has_active_occurrence(C,NO).
has_active_occurrence(C,O) <=> true.
%===============================================================================
gen_cond_attach_clause(F/A,Id,L,T) :-
( is_finally_stored(F/A) ->
get_allocation_occurrence(F/A,AllocationOccurrence),
get_max_occurrence(F/A,MaxOccurrence),
( chr_pp_flag(debugable,off), MaxOccurrence < AllocationOccurrence ->
( may_trigger(F/A) ->
gen_cond_attach_goal(F/A,Body,AllArgs,Args,Susp)
;
gen_insert_constraint_internal_goal(F/A,Body,AllArgs,Args,Susp)
)
; vars_susp(A,Args,Susp,AllArgs),
gen_uncond_attach_goal(F/A,Susp,Body,_)
),
( chr_pp_flag(debugable,on) ->
Constraint =.. [F|Args],
DebugEvent = 'chr debug_event'(insert(Constraint#Susp))
;
DebugEvent = true
),
build_head(F,A,Id,AllArgs,Head),
Clause = ( Head :- DebugEvent,Body ),
L = [Clause | T]
;
L = T
).
constraints
use_auxiliary_predicate/1,
is_used_auxiliary_predicate/1.
option(mode,use_auxiliary_predicate(+)).
use_auxiliary_predicate(P) \ use_auxiliary_predicate(P) <=> true.
use_auxiliary_predicate(P) \ is_used_auxiliary_predicate(P) <=> true.
is_used_auxiliary_predicate(P) <=> fail.
gen_cond_attach_goal(F/A,Goal,AllArgs,Args,Susp) :-
vars_susp(A,Args,Susp,AllArgs),
build_head(F,A,[0],AllArgs,Closure),
( may_trigger(F/A) ->
make_name('attach_',F/A,AttachF),
Attach =.. [AttachF,Vars,Susp]
;
Attach = true
),
get_target_module(Mod),
FTerm =.. [F|Args],
generate_insert_constraint_call(F/A,Susp,InsertCall),
use_auxiliary_predicate(insert_constraint_internal),
use_auxiliary_predicate(activate_constraint),
Goal =
(
( var(Susp) ->
insert_constraint_internal(Stored,Vars,Susp,Mod:Closure,FTerm,Args)
;
activate_constraint(Stored,Vars,Susp,_)
),
( Stored == yes ->
InsertCall,
Attach
;
true
)
).
gen_insert_constraint_internal_goal(F/A,Goal,AllArgs,Args,Susp) :-
vars_susp(A,Args,Susp,AllArgs),
( may_trigger(F/A) ->
make_name('attach_',F/A,AttachF),
Attach =.. [AttachF,Vars,Susp],
build_head(F,A,[0],AllArgs,Closure),
get_target_module(Mod),
Cont = Mod : Closure
;
Attach = true,
Cont = true
),
FTerm =.. [F|Args],
generate_insert_constraint_call(F/A,Susp,InsertCall),
use_auxiliary_predicate(insert_constraint_internal),
Goal =
(
insert_constraint_internal(_,Vars,Susp,Cont,FTerm,Args),
InsertCall,
Attach
).
gen_uncond_attach_goal(FA,Susp,AttachGoal,Generation) :-
( may_trigger(FA) ->
make_name('attach_',FA,AttachF),
Attach =.. [AttachF,Vars,Susp]
;
Attach = true
),
generate_insert_constraint_call(FA,Susp,InsertCall),
( chr_pp_flag(late_allocation,on) ->
use_auxiliary_predicate(activate_constraint),
AttachGoal =
(
activate_constraint(Stored,Vars, Susp, Generation),
( Stored == yes ->
InsertCall,
Attach
;
true
)
)
;
use_auxiliary_predicate(activate_constraint),
AttachGoal =
(
activate_constraint(Stored,Vars, Susp, Generation)
)
).
%-------------------------------------------------------------------------------
constraints occurrences_code/6.
option(mode,occurrences_code(+,+,+,+,+,+)).
%-------------------------------------------------------------------------------
max_occurrence(C,MO) \ occurrences_code(C,O,Id,NId,L,T)
<=> O > MO
| NId = Id, L = T.
occurrences_code(C,O,Id,NId,L,T)
<=> occurrence_code(C,O,Id,Id1,L,L1),
NO is O + 1,
occurrences_code(C,NO,Id1,NId,L1,T).
%-------------------------------------------------------------------------------
constraints occurrence_code/6.
option(mode,occurrence_code(+,+,+,+,+,+)).
%-------------------------------------------------------------------------------
occurrence(C,O,RuleNb,ID), passive(RuleNb,ID) \ occurrence_code(C,O,Id,NId,L,T)
<=> NId = Id, L = T.
occurrence(C,O,RuleNb,ID), rule(RuleNb,PragmaRule) \ occurrence_code(C,O,Id,NId,L,T)
<=> true |
PragmaRule = pragma(rule(Heads1,Heads2,_,_),ids(IDs1,IDs2),_,_,_),
( select2(ID,Head1,IDs1,Heads1,RIDs1,RHeads1) ->
NId = Id,
head1_code(Head1,RHeads1,RIDs1,PragmaRule,C,O,Id,L,T)
; select2(ID,Head2,IDs2,Heads2,RIDs2,RHeads2) ->
head2_code(Head2,RHeads2,RIDs2,PragmaRule,C,O,Id,L,L1),
inc_id(Id,NId),
( unconditional_occurrence(C,O) ->
L1 = T
;
gen_alloc_inc_clause(C,O,Id,L1,T)
)
).
occurrence_code(C,O,_,_,_,_)
<=>
format('occurrence_code/6: missing information to compile ~w:~w\n',[C,O]),fail.
%-------------------------------------------------------------------------------
%% Generate code based on one removed head of a CHR rule
head1_code(Head,OtherHeads,OtherIDs,PragmaRule,FA,O,Id,L,T) :-
PragmaRule = pragma(Rule,_,_,_Name,RuleNb),
Rule = rule(_,Head2,_,_),
( Head2 == [] ->
reorder_heads(RuleNb,Head,OtherHeads,OtherIDs,NOtherHeads,NOtherIDs),
simplification_code(Head,NOtherHeads,NOtherIDs,PragmaRule,FA,O,Id,L,T)
;
simpagation_head1_code(Head,OtherHeads,OtherIDs,PragmaRule,FA,Id,L,T)
).
%% Generate code based on one persistent head of a CHR rule
head2_code(Head,OtherHeads,OtherIDs,PragmaRule,FA,O,Id,L,T) :-
PragmaRule = pragma(Rule,_,_,_Name,RuleNb),
Rule = rule(Head1,_,_,_),
( Head1 == [] ->
reorder_heads(RuleNb,Head,OtherHeads,OtherIDs,NOtherHeads,NOtherIDs),
propagation_code(Head,NOtherHeads,NOtherIDs,Rule,RuleNb,FA,O,Id,L,T)
;
simpagation_head2_code(Head,OtherHeads,OtherIDs,PragmaRule,FA,O,Id,L,T)
).
gen_alloc_inc_clause(F/A,O,Id,L,T) :-
vars_susp(A,Vars,Susp,VarsSusp),
build_head(F,A,Id,VarsSusp,Head),
inc_id(Id,IncId),
build_head(F,A,IncId,VarsSusp,CallHead),
gen_occ_allocation(F/A,O,Vars,Susp,VarsSusp,ConditionalAlloc),
Clause =
(
Head :-
ConditionalAlloc,
CallHead
),
L = [Clause|T].
gen_cond_allocation(Vars,Susp,FA,VarsSusp,ConstraintAllocationGoal) :-
gen_allocation(Vars,Susp,FA,VarsSusp,UncondConstraintAllocationGoal),
ConstraintAllocationGoal =
( var(Susp) ->
UncondConstraintAllocationGoal
;
true
).
gen_allocation(Vars,Susp,F/A,VarsSusp,ConstraintAllocationGoal) :-
( may_trigger(F/A) ->
build_head(F,A,[0],VarsSusp,Term),
get_target_module(Mod),
Cont = Mod : Term
;
Cont = true
),
FTerm =.. [F|Vars],
use_auxiliary_predicate(allocate_constraint),
ConstraintAllocationGoal = allocate_constraint(Cont, Susp, FTerm, Vars).
gen_occ_allocation(FA,O,Vars,Susp,VarsSusp,ConstraintAllocationGoal) :-
get_allocation_occurrence(FA,AO),
( chr_pp_flag(debugable,off), O == AO ->
( may_trigger(FA) ->
gen_cond_allocation(Vars,Susp,FA,VarsSusp,ConstraintAllocationGoal)
;
gen_allocation(Vars,Susp,FA,VarsSusp,ConstraintAllocationGoal)
)
;
ConstraintAllocationGoal = true
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
guard_via_reschedule(Retrievals,GuardList,Prelude,Goal) :-
( chr_pp_flag(guard_via_reschedule,on) ->
guard_via_reschedule_main(Retrievals,GuardList,Prelude,Goal)
;
append(Retrievals,GuardList,GoalList),
list2conj(GoalList,Goal)
).
guard_via_reschedule_main(Retrievals,GuardList,Prelude,Goal) :-
initialize_unit_dictionary(Prelude,Dict),
build_units(Retrievals,GuardList,Dict,Units),
dependency_reorder(Units,NUnits),
units2goal(NUnits,Goal).
units2goal([],true).
units2goal([unit(_,Goal,_,_)|Units],(Goal,Goals)) :-
units2goal(Units,Goals).
dependency_reorder(Units,NUnits) :-
dependency_reorder(Units,[],NUnits).
dependency_reorder([],Acc,Result) :-
reverse(Acc,Result).
dependency_reorder([Unit|Units],Acc,Result) :-
Unit = unit(_GID,_Goal,Type,GIDs),
( Type == fixed ->
NAcc = [Unit|Acc]
;
dependency_insert(Acc,Unit,GIDs,NAcc)
),
dependency_reorder(Units,NAcc,Result).
dependency_insert([],Unit,_,[Unit]).
dependency_insert([X|Xs],Unit,GIDs,L) :-
X = unit(GID,_,_,_),
( memberchk(GID,GIDs) ->
L = [Unit,X|Xs]
;
L = [X | T],
dependency_insert(Xs,Unit,GIDs,T)
).
build_units(Retrievals,Guard,InitialDict,Units) :-
build_retrieval_units(Retrievals,1,N,InitialDict,Dict,Units,Tail),
build_guard_units(Guard,N,Dict,Tail).
build_retrieval_units([],N,N,Dict,Dict,L,L).
build_retrieval_units([U|Us],N,M,Dict,NDict,L,T) :-
term_variables(U,Vs),
update_unit_dictionary(Vs,N,Dict,Dict1,[],GIDs),
L = [unit(N,U,movable,GIDs)|L1],
N1 is N + 1,
build_retrieval_units2(Us,N1,M,Dict1,NDict,L1,T).
build_retrieval_units2([],N,N,Dict,Dict,L,L).
build_retrieval_units2([U|Us],N,M,Dict,NDict,L,T) :-
term_variables(U,Vs),
update_unit_dictionary(Vs,N,Dict,Dict1,[],GIDs),
L = [unit(N,U,fixed,GIDs)|L1],
N1 is N + 1,
build_retrieval_units(Us,N1,M,Dict1,NDict,L1,T).
initialize_unit_dictionary(Term,Dict) :-
term_variables(Term,Vars),
pair_all_with(Vars,0,Dict).
update_unit_dictionary([],_,Dict,Dict,GIDs,GIDs).
update_unit_dictionary([V|Vs],This,Dict,NDict,GIDs,NGIDs) :-
( lookup_eq(Dict,V,GID) ->
( (GID == This ; memberchk(GID,GIDs) ) ->
GIDs1 = GIDs
;
GIDs1 = [GID|GIDs]
),
Dict1 = Dict
;
Dict1 = [V - This|Dict],
GIDs1 = GIDs
),
update_unit_dictionary(Vs,This,Dict1,NDict,GIDs1,NGIDs).
build_guard_units(Guard,N,Dict,Units) :-
( Guard = [Goal] ->
Units = [unit(N,Goal,fixed,[])]
; Guard = [Goal|Goals] ->
term_variables(Goal,Vs),
update_unit_dictionary2(Vs,N,Dict,NDict,[],GIDs),
Units = [unit(N,Goal,movable,GIDs)|RUnits],
N1 is N + 1,
build_guard_units(Goals,N1,NDict,RUnits)
).
update_unit_dictionary2([],_,Dict,Dict,GIDs,GIDs).
update_unit_dictionary2([V|Vs],This,Dict,NDict,GIDs,NGIDs) :-
( lookup_eq(Dict,V,GID) ->
( (GID == This ; memberchk(GID,GIDs) ) ->
GIDs1 = GIDs
;
GIDs1 = [GID|GIDs]
),
Dict1 = [V - This|Dict]
;
Dict1 = [V - This|Dict],
GIDs1 = GIDs
),
update_unit_dictionary2(Vs,This,Dict1,NDict,GIDs1,NGIDs).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ____ _ ____ _ _
%% / ___| ___| |_ / ___| ___ _ __ ___ __ _ _ __ | |_(_) ___ ___ _
%% \___ \ / _ \ __| \___ \ / _ \ '_ ` _ \ / _` | '_ \| __| |/ __/ __(_)
%% ___) | __/ |_ ___) | __/ | | | | | (_| | | | | |_| | (__\__ \_
%% |____/ \___|\__| |____/ \___|_| |_| |_|\__,_|_| |_|\__|_|\___|___(_)
%%
%% _ _ _ ___ __
%% | | | |_ __ (_) __ _ _ _ ___ |_ _|_ __ / _| ___ _ __ ___ _ __ ___ ___
%% | | | | '_ \| |/ _` | | | |/ _ \ | || '_ \| |_ / _ \ '__/ _ \ '_ \ / __/ _ \
%% | |_| | | | | | (_| | |_| | __/ | || | | | _| __/ | | __/ | | | (_| __/
%% \___/|_| |_|_|\__, |\__,_|\___| |___|_| |_|_| \___|_| \___|_| |_|\___\___|
%% |_|
constraints
functional_dependency/4,
get_functional_dependency/4.
option(mode,functional_dependency(+,+,?,?)).
allocation_occurrence(C,AO), occurrence(C,O,RuleNb,_) \ functional_dependency(C,RuleNb,Pattern,Key)
<=>
RuleNb > 1, AO > O
|
functional_dependency(C,1,Pattern,Key).
functional_dependency(C,RuleNb1,Pattern,Key) \ get_functional_dependency(C,RuleNb2,QPattern,QKey)
<=>
RuleNb2 >= RuleNb1
|
QPattern = Pattern, QKey = Key.
get_functional_dependency(_,_,_,_)
<=>
fail.
functional_dependency_analysis(Rules) :-
( chr_pp_flag(functional_dependency_analysis,on) ->
functional_dependency_analysis_main(Rules)
;
true
).
functional_dependency_analysis_main([]).
functional_dependency_analysis_main([PRule|PRules]) :-
( discover_unique_pattern(PRule,C,RuleNb,Pattern,Key) ->
functional_dependency(C,RuleNb,Pattern,Key)
;
true
),
functional_dependency_analysis_main(PRules).
discover_unique_pattern(PragmaRule,F/A,RuleNb,Pattern,Key) :-
PragmaRule = pragma(Rule,_,_,Name,RuleNb),
Rule = rule(H1,H2,Guard,_),
( H1 = [C1],
H2 = [C2] ->
true
; H1 = [C1,C2],
H2 == [] ->
true
),
check_unique_constraints(C1,C2,Guard,RuleNb,List),
term_variables(C1,Vs),
select_pragma_unique_variables(Vs,List,Key1),
copy_term_nat(C1-Key1,Pattern-Key),
functor(C1,F,A).
select_pragma_unique_variables([],_,[]).
select_pragma_unique_variables([V|Vs],List,L) :-
( lookup_eq(List,V,_) ->
L = T
;
L = [V|T]
),
select_pragma_unique_variables(Vs,List,T).
% depends on functional dependency analysis
% and shape of rule: C1 \ C2 <=> true.
set_semantics_rules(Rules) :-
( chr_pp_flag(set_semantics_rule,on) ->
set_semantics_rules_main(Rules)
;
true
).
set_semantics_rules_main([]).
set_semantics_rules_main([R|Rs]) :-
set_semantics_rule_main(R),
set_semantics_rules_main(Rs).
set_semantics_rule_main(PragmaRule) :-
PragmaRule = pragma(Rule,IDs,Pragmas,_,RuleNb),
( Rule = rule([C1],[C2],true,_),
IDs = ids([ID1],[ID2]),
\+ is_passive(RuleNb,ID1),
functor(C1,F,A),
get_functional_dependency(F/A,RuleNb,Pattern,Key),
copy_term_nat(Pattern-Key,C1-Key1),
copy_term_nat(Pattern-Key,C2-Key2),
Key1 == Key2 ->
passive(RuleNb,ID2)
;
true
).
check_unique_constraints(C1,C2,G,RuleNb,List) :-
\+ any_passive_head(RuleNb),
variable_replacement(C1-C2,C2-C1,List),
copy_with_variable_replacement(G,OtherG,List),
negate_b(G,NotG),
once(entails_b(NotG,OtherG)).
% checks for rules of the shape ...,C1,C2... (<|=)==> ...
% where C1 and C2 are symmteric constraints
symmetry_analysis(Rules) :-
( chr_pp_flag(check_unnecessary_active,off) ->
true
;
symmetry_analysis_main(Rules)
).
symmetry_analysis_main([]).
symmetry_analysis_main([R|Rs]) :-
R = pragma(Rule,ids(IDs1,IDs2),_,_,RuleNb),
Rule = rule(H1,H2,_,_),
( ( \+ chr_pp_flag(check_unnecessary_active,simplification)
; H2 == [] ), H1 \== [] ->
symmetry_analysis_heads(H1,IDs1,[],[],Rule,RuleNb),
symmetry_analysis_heads(H2,IDs2,[],[],Rule,RuleNb)
;
true
),
symmetry_analysis_main(Rs).
symmetry_analysis_heads([],[],_,_,_,_).
symmetry_analysis_heads([H|Hs],[ID|IDs],PreHs,PreIDs,Rule,RuleNb) :-
( \+ is_passive(RuleNb,ID),
member2(PreHs,PreIDs,PreH-PreID),
\+ is_passive(RuleNb,PreID),
variable_replacement(PreH,H,List),
copy_with_variable_replacement(Rule,Rule2,List),
identical_rules(Rule,Rule2) ->
passive(RuleNb,ID)
;
true
),
symmetry_analysis_heads(Hs,IDs,[H|PreHs],[ID|PreIDs],Rule,RuleNb).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ____ _ _ _ __ _ _ _
%% / ___|(_)_ __ ___ _ __ | (_)/ _(_) ___ __ _| |_(_) ___ _ __
%% \___ \| | '_ ` _ \| '_ \| | | |_| |/ __/ _` | __| |/ _ \| '_ \
%% ___) | | | | | | | |_) | | | _| | (_| (_| | |_| | (_) | | | |
%% |____/|_|_| |_| |_| .__/|_|_|_| |_|\___\__,_|\__|_|\___/|_| |_|
%% |_|
simplification_code(Head,RestHeads,RestIDs,PragmaRule,F/A,O,Id,L,T) :-
PragmaRule = pragma(Rule,_,Pragmas,_,_RuleNb),
head_info(Head,A,_Vars,Susp,HeadVars,HeadPairs),
build_head(F,A,Id,HeadVars,ClauseHead),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,[],FirstMatching,VarDict1,[],GroundVars),
rest_heads_retrieval_and_matching(RestHeads,RestIDs,Head,GetRestHeads,Susps,VarDict1,VarDict,[],[],[],GroundVars,_),
guard_body_copies2(Rule,VarDict,GuardCopyList,BodyCopy),
guard_via_reschedule(GetRestHeads,GuardCopyList,ClauseHead-FirstMatching,RescheduledTest),
gen_uncond_susps_detachments(Susps,RestHeads,SuspsDetachments),
gen_cond_susp_detachment(Id,Susp,F/A,SuspDetachment),
( chr_pp_flag(debugable,on) ->
Rule = rule(_,_,Guard,Body),
my_term_copy(Guard - Body, VarDict, DebugGuard - DebugBody),
DebugTry = 'chr debug_event'( try([Susp|RestSusps],[],DebugGuard,DebugBody)),
DebugApply = 'chr debug_event'(apply([Susp|RestSusps],[],DebugGuard,DebugBody)),
instrument_goal(ActualCut,DebugTry,DebugApply,Cut)
;
Cut = ActualCut
),
( unconditional_occurrence(F/A,O), chr_pp_flag(late_allocation,on) -> ActualCut = true ; ActualCut = (!) ),
Clause = ( ClauseHead :-
FirstMatching,
RescheduledTest,
Cut,
SuspsDetachments,
SuspDetachment,
BodyCopy
),
L = [Clause | T].
head_arg_matches(Pairs,Modes,VarDict,Goal,NVarDict) :-
head_arg_matches(Pairs,Modes,VarDict,Goal,NVarDict,[],_).
head_arg_matches(Pairs,Modes,VarDict,Goal,NVarDict,GroundVars,NGroundVars) :-
head_arg_matches_(Pairs,Modes,VarDict,GroundVars,GoalList,NVarDict,NGroundVars),
list2conj(GoalList,Goal).
head_arg_matches_([],[],VarDict,GroundVars,[],VarDict,GroundVars).
head_arg_matches_([Arg-Var| Rest],[Mode|Modes],VarDict,GroundVars,GoalList,NVarDict,NGroundVars) :-
( var(Arg) ->
( lookup_eq(VarDict,Arg,OtherVar) ->
( Mode = (+) ->
( memberchk_eq(Arg,GroundVars) ->
GoalList = [Var = OtherVar | RestGoalList],
GroundVars1 = GroundVars
;
GoalList = [Var == OtherVar | RestGoalList],
GroundVars1 = [Arg|GroundVars]
)
;
GoalList = [Var == OtherVar | RestGoalList],
GroundVars1 = GroundVars
),
VarDict1 = VarDict
; VarDict1 = [Arg-Var | VarDict],
GoalList = RestGoalList,
( Mode = (+) ->
GroundVars1 = [Arg|GroundVars]
;
GroundVars1 = GroundVars
)
),
Pairs = Rest,
RestModes = Modes
; atomic(Arg) ->
( Mode = (+) ->
GoalList = [ Var = Arg | RestGoalList]
;
GoalList = [ Var == Arg | RestGoalList]
),
VarDict = VarDict1,
GroundVars1 = GroundVars,
Pairs = Rest,
RestModes = Modes
; Mode == (+), is_ground(GroundVars,Arg) ->
copy_with_variable_replacement(Arg,ArgCopy,VarDict),
GoalList = [ Var = ArgCopy | RestGoalList],
VarDict = VarDict1,
GroundVars1 = GroundVars,
Pairs = Rest,
RestModes = Modes
; Arg =.. [_|Args],
functor(Arg,Fct,N),
functor(Term,Fct,N),
Term =.. [_|Vars],
( Mode = (+) ->
GoalList = [ Var = Term | RestGoalList ]
;
GoalList = [ nonvar(Var), Var = Term | RestGoalList ]
),
pairup(Args,Vars,NewPairs),
append(NewPairs,Rest,Pairs),
replicate(N,Mode,NewModes),
append(NewModes,Modes,RestModes),
VarDict1 = VarDict,
GroundVars1 = GroundVars
),
head_arg_matches_(Pairs,RestModes,VarDict1,GroundVars1,RestGoalList,NVarDict,NGroundVars).
is_ground(GroundVars,Term) :-
( ground(Term) ->
true
; compound(Term) ->
Term =.. [_|Args],
maplist(is_ground(GroundVars),Args)
;
memberchk_eq(Term,GroundVars)
).
rest_heads_retrieval_and_matching(Heads,IDs,ActiveHead,GoalList,Susps,VarDict,NVarDict):-
rest_heads_retrieval_and_matching(Heads,IDs,ActiveHead,GoalList,Susps,VarDict,NVarDict,[],[],[],[],_).
rest_heads_retrieval_and_matching(Heads,IDs,ActiveHead,GoalList,Susps,VarDict,NVarDict,PrevHs,PrevSusps,AttrDict) :-
rest_heads_retrieval_and_matching(Heads,IDs,ActiveHead,GoalList,Susps,VarDict,NVarDict,PrevHs,PrevSusps,AttrDict,[],_).
rest_heads_retrieval_and_matching(Heads,IDs,ActiveHead,GoalList,Susps,VarDict,NVarDict,PrevHs,PrevSusps,AttrDict,GroundVars,NGroundVars) :-
( Heads = [_|_] ->
rest_heads_retrieval_and_matching_n(Heads,IDs,PrevHs,PrevSusps,ActiveHead,GoalList,Susps,VarDict,NVarDict,AttrDict,GroundVars,NGroundVars)
;
GoalList = [],
Susps = [],
VarDict = NVarDict,
GroundVars = NGroundVars
).
rest_heads_retrieval_and_matching_n([],_,_,_,_,[],[],VarDict,VarDict,AttrDict,GroundVars,GroundVars) :-
instantiate_pattern_goals(AttrDict).
rest_heads_retrieval_and_matching_n([H|Hs],[ID|IDs],PrevHs,PrevSusps,ActiveHead,[Goal|Goals],[Susp|Susps],VarDict,NVarDict,AttrDict,GroundVars,NGroundVars) :-
functor(H,F,A),
head_info(H,A,Vars,_,_,Pairs),
get_store_type(F/A,StoreType),
( StoreType == default ->
passive_head_via(H,[ActiveHead|PrevHs],AttrDict,VarDict,ViaGoal,Attr,NewAttrDict),
get_max_constraint_index(N),
( N == 1 ->
VarSusps = Attr
;
get_constraint_index(F/A,Pos),
make_attr(N,_Mask,SuspsList,Attr),
nth(Pos,SuspsList,VarSusps)
),
create_get_mutable(active,State,GetMutable),
get_constraint_mode(F/A,Mode),
head_arg_matches(Pairs,Mode,VarDict,MatchingGoal,VarDict1,GroundVars,GroundVars1),
ExistentialLookup = (
ViaGoal,
'chr sbag_member'(Susp,VarSusps),
Susp = Suspension,
GetMutable
)
;
existential_lookup(StoreType,H,[ActiveHead|PrevHs],VarDict,Suspension,State,ExistentialLookup,Susp,Pairs,NPairs),
get_constraint_mode(F/A,Mode),
filter_mode(NPairs,Pairs,Mode,NMode),
head_arg_matches(NPairs,NMode,VarDict,MatchingGoal,VarDict1,GroundVars,GroundVars1),
NewAttrDict = AttrDict
),
Suspension =.. [suspension,_,State,_,_,_,_|Vars],
different_from_other_susps(H,Susp,PrevHs,PrevSusps,DiffSuspGoals),
Goal =
(
ExistentialLookup,
DiffSuspGoals,
MatchingGoal
),
rest_heads_retrieval_and_matching_n(Hs,IDs,[H|PrevHs],[Susp|PrevSusps],ActiveHead,Goals,Susps,VarDict1,NVarDict,NewAttrDict,GroundVars1,NGroundVars).
filter_mode([],_,_,[]).
filter_mode([Arg-Var|Rest],[_-V|R],[M|Ms],Modes) :-
( Var == V ->
Modes = [M|MT],
filter_mode(Rest,R,Ms,MT)
;
filter_mode([Arg-Var|Rest],R,Ms,Modes)
).
instantiate_pattern_goals([]).
instantiate_pattern_goals([_-attr(Attr,Bits,Goal)|Rest]) :-
get_max_constraint_index(N),
( N == 1 ->
Goal = true
;
make_attr(N,Mask,_,Attr),
or_list(Bits,Pattern), !,
Goal = (Mask /\ Pattern =:= Pattern)
),
instantiate_pattern_goals(Rest).
check_unique_keys([],_).
check_unique_keys([V|Vs],Dict) :-
lookup_eq(Dict,V,_),
check_unique_keys(Vs,Dict).
% Generates tests to ensure the found constraint differs from previously found constraints
% TODO: detect more cases where constraints need be different
different_from_other_susps(Head,Susp,Heads,Susps,DiffSuspGoals) :-
different_from_other_susps_(Heads,Susps,Head,Susp,DiffSuspGoalList),
list2conj(DiffSuspGoalList,DiffSuspGoals).
% ( bagof(DiffSuspGoal, Pos ^ ( nth(Pos,Heads,PreHead), \+ Head \= PreHead, nth(Pos,Susps,PreSusp), DiffSuspGoal = (Susp \== PreSusp) ),DiffSuspGoalList) ->
% list2conj(DiffSuspGoalList,DiffSuspGoals)
% ;
% DiffSuspGoals = true
% ).
different_from_other_susps_(_,[],_,_,[]) :- !.
different_from_other_susps_([PreHead|Heads],[PreSusp|Susps],Head,Susp,List) :-
( functor(Head,F,A), functor(PreHead,F,A),
copy_term_nat(PreHead-Head,PreHeadCopy-HeadCopy),
\+ \+ PreHeadCopy = HeadCopy ->
List = [Susp \== PreSusp | Tail]
;
List = Tail
),
different_from_other_susps_(Heads,Susps,Head,Susp,Tail).
passive_head_via(Head,PrevHeads,AttrDict,VarDict,Goal,Attr,NewAttrDict) :-
functor(Head,F,A),
get_constraint_index(F/A,Pos),
common_variables(Head,PrevHeads,CommonVars),
translate(CommonVars,VarDict,Vars),
or_pattern(Pos,Bit),
( permutation(Vars,PermutedVars),
lookup_eq(AttrDict,PermutedVars,attr(Attr,Positions,_)) ->
member(Bit,Positions), !,
NewAttrDict = AttrDict,
Goal = true
;
Goal = (Goal1, PatternGoal),
gen_get_mod_constraints(Vars,Goal1,Attr),
NewAttrDict = [Vars - attr(Attr,[Bit|_],PatternGoal) | AttrDict]
).
common_variables(T,Ts,Vs) :-
term_variables(T,V1),
term_variables(Ts,V2),
intersect_eq(V1,V2,Vs).
gen_get_mod_constraints(L,Goal,Susps) :-
get_target_module(Mod),
( L == [] ->
Goal =
( 'chr global_term_ref_1'(Global),
get_attr(Global,Mod,TSusps),
TSusps = Susps
)
;
( L = [A] ->
VIA = 'chr via_1'(A,V)
; ( L = [A,B] ->
VIA = 'chr via_2'(A,B,V)
; VIA = 'chr via'(L,V)
)
),
Goal =
( VIA,
get_attr(V,Mod,TSusps),
TSusps = Susps
)
).
guard_body_copies(Rule,VarDict,GuardCopy,BodyCopy) :-
guard_body_copies2(Rule,VarDict,GuardCopyList,BodyCopy),
list2conj(GuardCopyList,GuardCopy).
guard_body_copies2(Rule,VarDict,GuardCopyList,BodyCopy) :-
Rule = rule(_,_,Guard,Body),
conj2list(Guard,GuardList),
split_off_simple_guard(GuardList,VarDict,GuardPrefix,RestGuardList),
my_term_copy(GuardPrefix-RestGuardList,VarDict,VarDict2,GuardPrefixCopy-RestGuardListCopyCore),
append(GuardPrefixCopy,[RestGuardCopy],GuardCopyList),
term_variables(RestGuardList,GuardVars),
term_variables(RestGuardListCopyCore,GuardCopyVars),
( chr_pp_flag(guard_locks,on),
bagof(('chr lock'(Y)) - (chr_runtime:unlock(Y)),
X ^ (lists:member(X,GuardVars), % X is a variable appearing in the original guard
pairlist:lookup_eq(VarDict,X,Y), % translate X into new variable
memberchk_eq(Y,GuardCopyVars) % redundant check? or multiple entries for X possible?
),
LocksUnlocks) ->
once(pairup(Locks,Unlocks,LocksUnlocks))
;
Locks = [],
Unlocks = []
),
list2conj(Locks,LockPhase),
list2conj(Unlocks,UnlockPhase),
list2conj(RestGuardListCopyCore,RestGuardCopyCore),
RestGuardCopy = (LockPhase,(RestGuardCopyCore,UnlockPhase)),
my_term_copy(Body,VarDict2,BodyCopy).
split_off_simple_guard([],_,[],[]).
split_off_simple_guard([G|Gs],VarDict,S,C) :-
( simple_guard(G,VarDict) ->
S = [G|Ss],
split_off_simple_guard(Gs,VarDict,Ss,C)
;
S = [],
C = [G|Gs]
).
% simple guard: cheap and benign (does not bind variables)
simple_guard(G,VarDict) :-
binds_b(G,Vars),
\+ (( member(V,Vars),
lookup_eq(VarDict,V,_)
)).
gen_cond_susp_detachment(Id,Susp,FA,SuspDetachment) :-
( is_stored(FA) ->
( (Id == [0];
(get_allocation_occurrence(FA,AO),
get_max_occurrence(FA,MO),
MO < AO )),
\+ may_trigger(FA), chr_pp_flag(late_allocation,on) ->
SuspDetachment = true
;
gen_uncond_susp_detachment(Susp,FA,UnCondSuspDetachment),
( chr_pp_flag(late_allocation,on) ->
SuspDetachment =
( var(Susp) ->
true
; UnCondSuspDetachment
)
;
SuspDetachment = UnCondSuspDetachment
)
)
;
SuspDetachment = true
).
gen_uncond_susp_detachment(Susp,FA,SuspDetachment) :-
( is_stored(FA) ->
( may_trigger(FA) ->
make_name('detach_',FA,Fct),
Detach =.. [Fct,Vars,Susp]
;
Detach = true
),
( chr_pp_flag(debugable,on) ->
DebugEvent = 'chr debug_event'(remove(Susp))
;
DebugEvent = true
),
generate_delete_constraint_call(FA,Susp,DeleteCall),
use_auxiliary_predicate(remove_constraint_internal),
SuspDetachment =
(
DebugEvent,
remove_constraint_internal(Susp, Vars, Delete),
( Delete == yes ->
DeleteCall,
Detach
;
true
)
)
;
SuspDetachment = true
).
gen_uncond_susps_detachments([],[],true).
gen_uncond_susps_detachments([Susp|Susps],[Term|Terms],(SuspDetachment,SuspsDetachments)) :-
functor(Term,F,A),
gen_uncond_susp_detachment(Susp,F/A,SuspDetachment),
gen_uncond_susps_detachments(Susps,Terms,SuspsDetachments).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ____ _ _ _ _
%% / ___|(_)_ __ ___ _ __ __ _ __ _ __ _| |_(_) ___ _ __ / |
%% \___ \| | '_ ` _ \| '_ \ / _` |/ _` |/ _` | __| |/ _ \| '_ \ | |
%% ___) | | | | | | | |_) | (_| | (_| | (_| | |_| | (_) | | | | | |
%% |____/|_|_| |_| |_| .__/ \__,_|\__, |\__,_|\__|_|\___/|_| |_| |_|
%% |_| |___/
simpagation_head1_code(Head,RestHeads,OtherIDs,PragmaRule,F/A,Id,L,T) :-
PragmaRule = pragma(Rule,ids(_,Heads2IDs),Pragmas,_Name,_RuleNb),
Rule = rule(_Heads,Heads2,Guard,Body),
head_info(Head,A,_Vars,Susp,HeadVars,HeadPairs),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,[],FirstMatching,VarDict1,[],GroundVars),
build_head(F,A,Id,HeadVars,ClauseHead),
append(RestHeads,Heads2,Heads),
append(OtherIDs,Heads2IDs,IDs),
reorder_heads(RuleNb,Head,Heads,IDs,NHeads,NIDs),
rest_heads_retrieval_and_matching(NHeads,NIDs,Head,GetRestHeads,Susps,VarDict1,VarDict,[],[],[],GroundVars,_),
split_by_ids(NIDs,Susps,OtherIDs,Susps1,Susps2),
guard_body_copies2(Rule,VarDict,GuardCopyList,BodyCopy),
guard_via_reschedule(GetRestHeads,GuardCopyList,ClauseHead-FirstMatching,RescheduledTest),
gen_uncond_susps_detachments(Susps1,RestHeads,SuspsDetachments),
gen_cond_susp_detachment(Id,Susp,F/A,SuspDetachment),
( chr_pp_flag(debugable,on) ->
my_term_copy(Guard - Body, VarDict, DebugGuard - DebugBody),
DebugTry = 'chr debug_event'( try([Susp|Susps1],Susps2,DebugGuard,DebugBody)),
DebugApply = 'chr debug_event'(apply([Susp|Susps1],Susps2,DebugGuard,DebugBody)),
instrument_goal((!),DebugTry,DebugApply,Cut)
;
Cut = (!)
),
Clause = ( ClauseHead :-
FirstMatching,
RescheduledTest,
Cut,
SuspsDetachments,
SuspDetachment,
BodyCopy
),
L = [Clause | T].
split_by_ids([],[],_,[],[]).
split_by_ids([I|Is],[S|Ss],I1s,S1s,S2s) :-
( memberchk_eq(I,I1s) ->
S1s = [S | R1s],
S2s = R2s
;
S1s = R1s,
S2s = [S | R2s]
),
split_by_ids(Is,Ss,I1s,R1s,R2s).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ____ _ _ _ ____
%% / ___|(_)_ __ ___ _ __ __ _ __ _ __ _| |_(_) ___ _ __ |___ \
%% \___ \| | '_ ` _ \| '_ \ / _` |/ _` |/ _` | __| |/ _ \| '_ \ __) |
%% ___) | | | | | | | |_) | (_| | (_| | (_| | |_| | (_) | | | | / __/
%% |____/|_|_| |_| |_| .__/ \__,_|\__, |\__,_|\__|_|\___/|_| |_| |_____|
%% |_| |___/
%% Genereate prelude + worker predicate
%% prelude calls worker
%% worker iterates over one type of removed constraints
simpagation_head2_code(Head2,RestHeads2,RestIDs,PragmaRule,FA,O,Id,L,T) :-
PragmaRule = pragma(Rule,ids(IDs1,IDs2),Pragmas,_Name,RuleNb),
Rule = rule(Heads1,_,Guard,Body),
append(Heads1,RestHeads2,Heads),
append(IDs1,RestIDs,IDs),
reorder_heads(RuleNb,Head2,Heads,IDs,[NHead|NHeads],[NID|NIDs]),
simpagation_head2_prelude(Head2,NHead,[NHeads,Guard,Body],FA,O,Id,L,L1),
extend_id(Id,Id1),
( memberchk_eq(NID,IDs2) ->
simpagation_universal_searches(NHeads,NIDs,IDs2,[NHead,Head2],Rule,FA,NextHeads,PreHeads,NextIDs,Id1,Id2,L1,L2)
;
L1 = L2, Id1 = Id2,NextHeads = NHeads, PreHeads = [NHead,Head2], NextIDs = NIDs
),
universal_search_iterator_end(PreHeads,NextHeads,Rule,FA,Id2,L2,L3),
simpagation_head2_new_worker(PreHeads,NextHeads,NextIDs,PragmaRule,FA,O,Id2,L3,T).
simpagation_universal_searches([],[],_,PreHeads,_,_,[],PreHeads,[],Id,Id,L,L).
simpagation_universal_searches(Heads,[ID|IDs],IDs2,PreHeads,Rule,C,OutHeads,OutPreHeads,OutIDs,Id,NId,L,T) :-
Heads = [Head|RHeads],
inc_id(Id,Id1),
universal_search_iterator_end(PreHeads,Heads,Rule,C,Id,L,L0),
universal_search_iterator(Heads,PreHeads,Rule,C,Id,L0,L1),
( memberchk_eq(ID,IDs2) ->
simpagation_universal_searches(RHeads,IDs,IDs2,[Head|PreHeads],Rule,C,OutHeads,OutPreHeads,OutIDs,Id1,NId,L1,T)
;
NId = Id1, L1 = T, OutHeads = RHeads, OutPreHeads = [Head|PreHeads], IDs = OutIDs
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
simpagation_head2_prelude(Head,Head1,Rest,F/A,O,Id1,L,T) :-
head_info(Head,A,Vars,Susp,VarsSusp,HeadPairs),
build_head(F,A,Id1,VarsSusp,ClauseHead),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,[],FirstMatching,VarDict),
lookup_passive_head(Head1,[Head],VarDict,ModConstraintsGoal,AllSusps),
gen_occ_allocation(F/A,O,Vars,Susp,VarsSusp,ConstraintAllocationGoal),
extend_id(Id1,DelegateId),
extra_active_delegate_variables(Head,[Head1|Rest],VarDict,ExtraVars),
append([AllSusps|VarsSusp],ExtraVars,DelegateCallVars),
build_head(F,A,DelegateId,DelegateCallVars,Delegate),
PreludeClause =
( ClauseHead :-
FirstMatching,
ModConstraintsGoal,
!,
ConstraintAllocationGoal,
Delegate
),
L = [PreludeClause|T].
extra_active_delegate_variables(Term,Terms,VarDict,Vars) :-
Term =.. [_|Args],
delegate_variables(Term,Terms,VarDict,Args,Vars).
passive_delegate_variables(Term,PrevTerms,NextTerms,VarDict,Vars) :-
term_variables(PrevTerms,PrevVars),
delegate_variables(Term,NextTerms,VarDict,PrevVars,Vars).
delegate_variables(Term,Terms,VarDict,PrevVars,Vars) :-
term_variables(Term,V1),
term_variables(Terms,V2),
intersect_eq(V1,V2,V3),
list_difference_eq(V3,PrevVars,V4),
translate(V4,VarDict,Vars).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
simpagation_head2_new_worker([CurrentHead|PreHeads],NextHeads,NextIDs,PragmaRule,F/A,O,Id,L,T) :-
PragmaRule = pragma(Rule,ids(IDs1,_),Pragmas,_,RuleNb),
Rule = rule(_,_,Guard,Body),
get_prop_inner_loop_vars(PreHeads,[CurrentHead,NextHeads,Guard,Body],PreVarsAndSusps,VarDict,Susp,PreSusps),
gen_var(OtherSusp),
gen_var(OtherSusps),
functor(CurrentHead,OtherF,OtherA),
gen_vars(OtherA,OtherVars),
head_info(CurrentHead,OtherA,OtherVars,OtherSusp,_VarsSusp,HeadPairs),
get_constraint_mode(OtherF/OtherA,Mode),
head_arg_matches(HeadPairs,Mode,VarDict,FirstMatching,VarDict1),
OtherSuspension =.. [suspension,_,State,_,_,_,_|OtherVars],
different_from_other_susps(CurrentHead,OtherSusp,PreHeads,PreSusps,DiffSuspGoals),
create_get_mutable(active,State,GetMutable),
CurrentSuspTest = (
OtherSusp = OtherSuspension,
GetMutable,
DiffSuspGoals,
FirstMatching
),
ClauseVars = [[OtherSusp|OtherSusps]|PreVarsAndSusps],
build_head(F,A,Id,ClauseVars,ClauseHead),
rest_heads_retrieval_and_matching(NextHeads,NextIDs,[CurrentHead|PreHeads],RestSuspsRetrieval,Susps,VarDict1,VarDict2,[CurrentHead|PreHeads],[OtherSusp|PreSusps],[]),
split_by_ids(NextIDs,Susps,IDs1,Susps1,Susps2),
split_by_ids(NextIDs,NextHeads,IDs1,RestHeads1,_),
gen_uncond_susps_detachments([OtherSusp | Susps1],[CurrentHead|RestHeads1],Susps1Detachments),
RecursiveVars = [OtherSusps|PreVarsAndSusps],
build_head(F,A,Id,RecursiveVars,RecursiveCall),
RecursiveVars2 = [[]|PreVarsAndSusps],
build_head(F,A,Id,RecursiveVars2,RecursiveCall2),
guard_body_copies2(Rule,VarDict2,GuardCopyList,BodyCopy),
guard_via_reschedule(RestSuspsRetrieval,GuardCopyList,v(ClauseHead,CurrentSuspTest),RescheduledTest),
( BodyCopy \== true, is_observed(F/A,O) ->
gen_uncond_attach_goal(F/A,Susp,Attachment,Generation),
gen_state_cond_call(Susp,A,RecursiveCall,Generation,ConditionalRecursiveCall),
gen_state_cond_call(Susp,A,RecursiveCall2,Generation,ConditionalRecursiveCall2)
; Attachment = true,
ConditionalRecursiveCall = RecursiveCall,
ConditionalRecursiveCall2 = RecursiveCall2
),
( chr_pp_flag(debugable,on) ->
my_term_copy(Guard - Body, VarDict, DebugGuard - DebugBody),
DebugTry = 'chr debug_event'( try([OtherSusp|Susps1],[Susp|Susps2],DebugGuard,DebugBody)),
DebugApply = 'chr debug_event'(apply([OtherSusp|Susps1],[Susp|Susps2],DebugGuard,DebugBody))
;
DebugTry = true,
DebugApply = true
),
( member(unique(ID1,UniqueKeys), Pragmas),
check_unique_keys(UniqueKeys,VarDict) ->
Clause =
( ClauseHead :-
( CurrentSuspTest ->
( RescheduledTest,
DebugTry ->
DebugApply,
Susps1Detachments,
Attachment,
BodyCopy,
ConditionalRecursiveCall2
;
RecursiveCall2
)
;
RecursiveCall
)
)
;
Clause =
( ClauseHead :-
( CurrentSuspTest,
RescheduledTest,
DebugTry ->
DebugApply,
Susps1Detachments,
Attachment,
BodyCopy,
ConditionalRecursiveCall
;
RecursiveCall
)
)
),
L = [Clause | T].
gen_state_cond_call(Susp,N,Call,Generation,ConditionalCall) :-
length(Args,N),
Suspension =.. [suspension,_,State,_,NewGeneration,_,_|Args],
create_get_mutable(active,State,GetState),
create_get_mutable(Generation,NewGeneration,GetGeneration),
ConditionalCall =
( Susp = Suspension,
GetState,
GetGeneration ->
'chr update_mutable'(inactive,State),
Call
; true
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ____ _ _
%% | _ \ _ __ ___ _ __ __ _ __ _ __ _| |_(_) ___ _ __
%% | |_) | '__/ _ \| '_ \ / _` |/ _` |/ _` | __| |/ _ \| '_ \
%% | __/| | | (_) | |_) | (_| | (_| | (_| | |_| | (_) | | | |
%% |_| |_| \___/| .__/ \__,_|\__, |\__,_|\__|_|\___/|_| |_|
%% |_| |___/
propagation_code(Head,RestHeads,RestIDs,Rule,RuleNb,FA,O,Id,L,T) :-
( RestHeads == [] ->
propagation_single_headed(Head,Rule,RuleNb,FA,O,Id,L,T)
;
propagation_multi_headed(Head,RestHeads,RestIDs,Rule,RuleNb,FA,O,Id,L,T)
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Single headed propagation
%% everything in a single clause
propagation_single_headed(Head,Rule,RuleNb,F/A,O,Id,ProgramList,ProgramTail) :-
head_info(Head,A,Vars,Susp,VarsSusp,HeadPairs),
build_head(F,A,Id,VarsSusp,ClauseHead),
inc_id(Id,NextId),
build_head(F,A,NextId,VarsSusp,NextHead),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,[],HeadMatching,VarDict),
guard_body_copies(Rule,VarDict,GuardCopy,BodyCopy),
gen_occ_allocation(F/A,O,Vars,Susp,VarsSusp,Allocation),
% - recursive call -
RecursiveCall = NextHead,
( BodyCopy \== true, is_observed(F/A,O) ->
gen_uncond_attach_goal(F/A,Susp,Attachment,Generation),
gen_state_cond_call(Susp,A,RecursiveCall,Generation,ConditionalRecursiveCall)
; Attachment = true,
ConditionalRecursiveCall = RecursiveCall
),
( unconditional_occurrence(F/A,O), chr_pp_flag(late_allocation,on) ->
ActualCut = true
;
ActualCut = !
),
( chr_pp_flag(debugable,on) ->
Rule = rule(_,_,Guard,Body),
my_term_copy(Guard - Body, VarDict, DebugGuard - DebugBody),
DebugTry = 'chr debug_event'( try([],[Susp],DebugGuard,DebugBody)),
DebugApply = 'chr debug_event'(apply([],[Susp],DebugGuard,DebugBody)),
instrument_goal(ActualCut,DebugTry,DebugApply,Cut)
;
Cut = ActualCut
),
( may_trigger(F/A) ->
NovelProduction = 'chr novel_production'(Susp,RuleNb), % optimisation of t(RuleNb,Susp)
ExtendHistory = 'chr extend_history'(Susp,RuleNb)
;
NovelProduction = true,
ExtendHistory = true
),
Clause = (
ClauseHead :-
HeadMatching,
Allocation,
NovelProduction,
GuardCopy,
Cut,
ExtendHistory,
Attachment,
BodyCopy,
ConditionalRecursiveCall
),
ProgramList = [Clause | ProgramTail].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% multi headed propagation
%% prelude + predicates to accumulate the necessary combinations of suspended
%% constraints + predicate to execute the body
propagation_multi_headed(Head,RestHeads,RestIDs,Rule,RuleNb,FA,O,Id,L,T) :-
RestHeads = [First|Rest],
propagation_prelude(Head,RestHeads,Rule,FA,O,Id,L,L1),
extend_id(Id,ExtendedId),
propagation_nested_code(Rest,[First,Head],RestIDs,Rule,RuleNb,FA,O,ExtendedId,L1,T).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
propagation_prelude(Head,[First|Rest],Rule,F/A,O,Id,L,T) :-
head_info(Head,A,Vars,Susp,VarsSusp,HeadPairs),
build_head(F,A,Id,VarsSusp,PreludeHead),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,[],FirstMatching,VarDict),
Rule = rule(_,_,Guard,Body),
extra_active_delegate_variables(Head,[First,Rest,Guard,Body],VarDict,ExtraVars),
lookup_passive_head(First,[Head],VarDict,FirstSuspGoal,Susps),
gen_occ_allocation(F/A,O,Vars,Susp,VarsSusp,CondAllocation),
extend_id(Id,NestedId),
append([Susps|VarsSusp],ExtraVars,NestedVars),
build_head(F,A,NestedId,NestedVars,NestedHead),
NestedCall = NestedHead,
Prelude = (
PreludeHead :-
FirstMatching,
FirstSuspGoal,
!,
CondAllocation,
NestedCall
),
L = [Prelude|T].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
propagation_nested_code([],[CurrentHead|PreHeads],RestIDs,Rule,RuleNb,FA,O,Id,L,T) :-
universal_search_iterator_end([CurrentHead|PreHeads],[],Rule,FA,Id,L,L1),
propagation_body(CurrentHead,PreHeads,RestIDs,Rule,RuleNb,FA,O,Id,L1,T).
propagation_nested_code([Head|RestHeads],PreHeads,RestIDs,Rule,RuleNb,FA,O,Id,L,T) :-
universal_search_iterator_end(PreHeads,[Head|RestHeads],Rule,FA,Id,L,L1),
universal_search_iterator([Head|RestHeads],PreHeads,Rule,FA,Id,L1,L2),
inc_id(Id,IncId),
propagation_nested_code(RestHeads,[Head|PreHeads],RestIDs,Rule,RuleNb,FA,O,IncId,L2,T).
propagation_body(CurrentHead,PreHeads,RestIDs,Rule,RuleNb,F/A,O,Id,L,T) :-
Rule = rule(_,_,Guard,Body),
get_prop_inner_loop_vars(PreHeads,[CurrentHead,Guard,Body],PreVarsAndSusps,VarDict1,Susp,RestSusps),
gen_var(OtherSusp),
gen_var(OtherSusps),
functor(CurrentHead,OtherF,OtherA),
gen_vars(OtherA,OtherVars),
Suspension =.. [suspension,_,State,_,_,_,_|OtherVars],
create_get_mutable(active,State,GetMutable),
CurrentSuspTest = (
OtherSusp = Suspension,
GetMutable
),
ClauseVars = [[OtherSusp|OtherSusps]|PreVarsAndSusps],
build_head(F,A,Id,ClauseVars,ClauseHead),
RecursiveVars = [OtherSusps|PreVarsAndSusps],
build_head(F,A,Id,RecursiveVars,RecursiveHead),
RecursiveCall = RecursiveHead,
CurrentHead =.. [_|OtherArgs],
pairup(OtherArgs,OtherVars,OtherPairs),
get_constraint_mode(OtherF/OtherA,Mode),
head_arg_matches(OtherPairs,Mode,VarDict1,Matching,VarDict),
different_from_other_susps(CurrentHead,OtherSusp,PreHeads,RestSusps,DiffSuspGoals),
guard_body_copies(Rule,VarDict,GuardCopy,BodyCopy),
( BodyCopy \== true, is_observed(F/A,O) ->
gen_uncond_attach_goal(F/A,Susp,Attach,Generation),
gen_state_cond_call(Susp,A,RecursiveCall,Generation,ConditionalRecursiveCall)
; Attach = true,
ConditionalRecursiveCall = RecursiveCall
),
( is_least_occurrence(RuleNb) ->
NovelProduction = true,
ExtendHistory = true
;
get_occurrence(F/A,O,_,ID),
history_susps(RestIDs,[OtherSusp|RestSusps],Susp,ID,HistorySusps),
Tuple =.. [t,RuleNb|HistorySusps],
bagof('chr novel_production'(X,Y),( lists:member(X,HistorySusps), Y = TupleVar) ,NovelProductionsList),
list2conj(NovelProductionsList,NovelProductions),
NovelProduction = ( TupleVar = Tuple, NovelProductions),
ExtendHistory = 'chr extend_history'(Susp,TupleVar)
),
( chr_pp_flag(debugable,on) ->
Rule = rule(_,_,Guard,Body),
my_term_copy(Guard - Body, VarDict, DebugGuard - DebugBody),
DebugTry = 'chr debug_event'( try([],[Susp,OtherSusp|RestSusps],DebugGuard,DebugBody)),
DebugApply = 'chr debug_event'(apply([],[Susp,OtherSusp|RestSusps],DebugGuard,DebugBody))
;
DebugTry = true,
DebugApply = true
),
Clause = (
ClauseHead :-
( CurrentSuspTest,
DiffSuspGoals,
Matching,
NovelProduction,
GuardCopy,
DebugTry ->
DebugApply,
ExtendHistory,
Attach,
BodyCopy,
ConditionalRecursiveCall
; RecursiveCall
)
),
L = [Clause|T].
history_susps(RestIDs,ReversedRestSusps,Susp,ID,HistorySusps) :-
reverse(ReversedRestSusps,RestSusps),
pairup([ID|RestIDs],[Susp|RestSusps],IDSusps),
sort(IDSusps,SortedIDSusps),
pairup(_,HistorySusps,SortedIDSusps).
get_prop_inner_loop_vars([Head],Terms,HeadVars,VarDict,Susp,[]) :-
!,
functor(Head,F,A),
head_info(Head,A,_Vars,Susp,VarsSusp,Pairs),
get_constraint_mode(F/A,Mode),
head_arg_matches(Pairs,Mode,[],_,VarDict),
extra_active_delegate_variables(Head,Terms,VarDict,ExtraVars),
append(VarsSusp,ExtraVars,HeadVars).
get_prop_inner_loop_vars([Head|Heads],Terms,VarsSusps,NVarDict,MainSusp,[Susp|RestSusps]) :-
get_prop_inner_loop_vars(Heads,[Head|Terms],RestVarsSusp,VarDict,MainSusp,RestSusps),
functor(Head,F,A),
gen_var(Susps),
head_info(Head,A,_Vars,Susp,_VarsSusp,Pairs),
get_constraint_mode(F/A,Mode),
head_arg_matches(Pairs,Mode,VarDict,_,NVarDict),
passive_delegate_variables(Head,Heads,Terms,NVarDict,HeadVars),
append(HeadVars,[Susp,Susps|RestVarsSusp],VarsSusps).
gen_var_susp_list_for([Head],Terms,VarDict,HeadVars,VarsSusp,Susp) :-
!,
functor(Head,F,A),
head_info(Head,A,_Vars,Susp,VarsSusp,HeadPairs),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,[],_,VarDict),
extra_active_delegate_variables(Head,Terms,VarDict,ExtraVars),
append(VarsSusp,ExtraVars,HeadVars).
gen_var_susp_list_for([Head|Heads],Terms,NVarDict,VarsSusps,Rest,Susps) :-
gen_var_susp_list_for(Heads,[Head|Terms],VarDict,Rest,_,_),
functor(Head,F,A),
gen_var(Susps),
head_info(Head,A,_Vars,Susp,_VarsSusp,HeadPairs),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,VarDict,_,NVarDict),
passive_delegate_variables(Head,Heads,Terms,NVarDict,HeadVars),
append(HeadVars,[Susp,Susps|Rest],VarsSusps).
pre_vars_and_susps([Head],Terms,HeadVars,VarDict,[]) :-
!,
functor(Head,F,A),
head_info(Head,A,_Vars,_Susp,VarsSusp,HeadPairs),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,[],_,VarDict),
extra_active_delegate_variables(Head,Terms,VarDict,ExtraVars),
append(VarsSusp,ExtraVars,HeadVars).
pre_vars_and_susps([Head|Heads],Terms,NVSs,NVarDict,[Susp|Susps]) :-
pre_vars_and_susps(Heads,[Head|Terms],VSs,VarDict,Susps),
functor(Head,F,A),
gen_var(NextSusps),
head_info(Head,A,_Vars,Susp,_VarsSusp,HeadPairs),
get_constraint_mode(F/A,Mode),
head_arg_matches(HeadPairs,Mode,VarDict,_,NVarDict),
passive_delegate_variables(Head,Heads,Terms,NVarDict,HeadVars),
append(HeadVars,[Susp,NextSusps|VSs],NVSs).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ____ _ _ _ _
%% | _ \ __ _ ___ ___(_)_ _____ | | | | ___ __ _ __| |
%% | |_) / _` / __/ __| \ \ / / _ \ | |_| |/ _ \/ _` |/ _` |
%% | __/ (_| \__ \__ \ |\ V / __/ | _ | __/ (_| | (_| |
%% |_| \__,_|___/___/_| \_/ \___| |_| |_|\___|\__,_|\__,_|
%%
%% ____ _ _ _
%% | _ \ ___| |_ _ __(_) _____ ____ _| |
%% | |_) / _ \ __| '__| |/ _ \ \ / / _` | |
%% | _ < __/ |_| | | | __/\ V / (_| | |
%% |_| \_\___|\__|_| |_|\___| \_/ \__,_|_|
%%
%% ____ _ _
%% | _ \ ___ ___ _ __ __| | ___ _ __(_)_ __ __ _
%% | |_) / _ \/ _ \| '__/ _` |/ _ \ '__| | '_ \ / _` |
%% | _ < __/ (_) | | | (_| | __/ | | | | | | (_| |
%% |_| \_\___|\___/|_| \__,_|\___|_| |_|_| |_|\__, |
%% |___/
reorder_heads(RuleNb,Head,RestHeads,RestIDs,NRestHeads,NRestIDs) :-
( chr_pp_flag(reorder_heads,on) ->
reorder_heads_main(RuleNb,Head,RestHeads,RestIDs,NRestHeads,NRestIDs)
;
NRestHeads = RestHeads,
NRestIDs = RestIDs
).
reorder_heads_main(RuleNb,Head,RestHeads,RestIDs,NRestHeads,NRestIDs) :-
term_variables(Head,Vars),
InitialData = entry([],[],Vars,RestHeads,RestIDs,RuleNb),
copy_term_nat(InitialData,InitialDataCopy),
a_star(InitialDataCopy,FD^(chr_translate:final_data(FD)),N^EN^C^(chr_translate:expand_data(N,EN,C)),FinalData),
InitialDataCopy = InitialData,
FinalData = entry(RNRestHeads,RNRestIDs,_,_,_,_),
reverse(RNRestHeads,NRestHeads),
reverse(RNRestIDs,NRestIDs).
final_data(Entry) :-
Entry = entry(_,_,_,_,[],_).
expand_data(Entry,NEntry,Cost) :-
Entry = entry(Heads,IDs,Vars,NHeads,NIDs,RuleNb),
select2(Head1,ID1,NHeads,NIDs,NHeads1,NIDs1),
term_variables([Head1|Vars],Vars1),
NEntry = entry([Head1|Heads],[ID1|IDs],Vars1,NHeads1,NIDs1,RuleNb),
order_score(Head1,ID1,Vars,NHeads1,RuleNb,Cost).
% Assigns score to head based on known variables and heads to lookup
order_score(Head,ID,KnownVars,RestHeads,RuleNb,Score) :-
functor(Head,F,A),
get_store_type(F/A,StoreType),
order_score(StoreType,Head,ID,KnownVars,RestHeads,RuleNb,Score).
order_score(default,Head,_ID,KnownVars,RestHeads,RuleNb,Score) :-
term_variables(Head,HeadVars),
term_variables(RestHeads,RestVars),
order_score_vars(HeadVars,KnownVars,RestVars,Score).
order_score(multi_hash(Indexes),Head,_ID,KnownVars,RestHeads,RuleNb,Score) :-
order_score_indexes(Indexes,Head,KnownVars,0,Score).
order_score(global_ground,Head,ID,_KnownVars,_RestHeads,RuleNb,Score) :-
functor(Head,F,A),
( Vars == [] ->
Score = 10 % guaranteed O(1)
; A == 0 -> % flag constraint
Score = 1000 % O(1)? [CHECK: no deleted/triggered/... constraints in store?]
; A > 0 ->
Score = 10000
).
order_score(global_singleton,_Head,ID,_KnownVars,_RestHeads,_RuleNb,Score) :-
Score = 1. % guaranteed O(1)
order_score(multi_store(StoreTypes),Head,ID,KnownVars,RestHeads,RuleNb,Score) :-
find_with_var_identity(
S,
t(Head,KnownVars,RestHeads),
( lists:member(ST,StoreTypes), chr_translate:order_score(ST,Head,ID,KnownVars,RestHeads,RuleNb,S) ),
Scores
),
min_list(Scores,Score).
order_score_indexes([],_,_,Score,NScore) :-
Score > 0, NScore = 100.
order_score_indexes([I|Is],Head,KnownVars,Score,NScore) :-
multi_hash_key_args(I,Head,Args),
( forall(Arg,Args,memberchk_eq(Arg,KnownVars)) ->
Score1 is Score + 1
;
Score1 = Score
),
order_score_indexes(Is,Head,KnownVars,Score1,NScore).
order_score_vars(Vars,KnownVars,RestVars,Score) :-
order_score_count_vars(Vars,KnownVars,RestVars,K-R-O),
( K-R-O == 0-0-0 ->
Score = 0
; K > 0 ->
Score is max(10 - K,0)
; R > 0 ->
Score is max(10 - R,1) * 10
;
Score is max(10-O,1) * 100
).
order_score_count_vars([],_,_,0-0-0).
order_score_count_vars([V|Vs],KnownVars,RestVars,NK-NR-NO) :-
order_score_count_vars(Vs,KnownVars,RestVars,K-R-O),
( memberchk_eq(V,KnownVars) ->
NK is K + 1,
NR = R, NO = O
; memberchk_eq(V,RestVars) ->
NR is R + 1,
NK = K, NO = O
;
NO is O + 1,
NK = K, NR = R
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% ___ _ _ _
%% |_ _|_ __ | (_)_ __ (_)_ __ __ _
%% | || '_ \| | | '_ \| | '_ \ / _` |
%% | || | | | | | | | | | | | | (_| |
%% |___|_| |_|_|_|_| |_|_|_| |_|\__, |
%% |___/
create_get_mutable(V,M,GM) :-
M = mutable(V),
GM = true.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% _ _ _ _ _ _ _
%% | | | | |_(_) (_) |_ _ _
%% | | | | __| | | | __| | | |
%% | |_| | |_| | | | |_| |_| |
%% \___/ \__|_|_|_|\__|\__, |
%% |___/
gen_var(_).
gen_vars(N,Xs) :-
length(Xs,N).
head_info(Head,A,Vars,Susp,VarsSusp,HeadPairs) :-
vars_susp(A,Vars,Susp,VarsSusp),
Head =.. [_|Args],
pairup(Args,Vars,HeadPairs).
inc_id([N|Ns],[O|Ns]) :-
O is N + 1.
dec_id([N|Ns],[M|Ns]) :-
M is N - 1.
extend_id(Id,[0|Id]).
next_id([_,N|Ns],[O|Ns]) :-
O is N + 1.
build_head(F,A,Id,Args,Head) :-
buildName(F,A,Id,Name),
( (chr_pp_flag(debugable,on) ; is_stored(F/A), has_active_occurrence(F/A),
( may_trigger(F/A) ;
get_allocation_occurrence(F/A,AO),
get_max_occurrence(F/A,MO),
MO >= AO ) ) ->
Head =.. [Name|Args]
;
init(Args,ArgsWOSusp), % XXX not entirely correct!
Head =.. [Name|ArgsWOSusp]
).
buildName(Fct,Aty,List,Result) :-
( (chr_pp_flag(debugable,on) ; (once((is_stored(Fct/Aty), ( has_active_occurrence(Fct/Aty) ; chr_pp_flag(late_allocation,off)),
( may_trigger(Fct/Aty) ; get_allocation_occurrence(Fct/Aty,AO), get_max_occurrence(Fct/Aty,MO),
MO >= AO ) ; List \= [0])) ) ) ->
atom_concat(Fct, (/) ,FctSlash),
atom_concat(FctSlash,Aty,FctSlashAty),
buildName_(List,FctSlashAty,Result)
;
Result = Fct
).
buildName_([],Name,Name).
buildName_([N|Ns],Name,Result) :-
buildName_(Ns,Name,Name1),
atom_concat(Name1,'__',NameDash), % '_' is a char :-(
atom_concat(NameDash,N,Result).
vars_susp(A,Vars,Susp,VarsSusp) :-
length(Vars,A),
append(Vars,[Susp],VarsSusp).
make_attr(N,Mask,SuspsList,Attr) :-
length(SuspsList,N),
Attr =.. [v,Mask|SuspsList].
or_pattern(Pos,Pat) :-
Pow is Pos - 1,
Pat is 1 << Pow. % was 2 ** X
and_pattern(Pos,Pat) :-
X is Pos - 1,
Y is 1 << X, % was 2 ** X
Pat is (-1)*(Y + 1).
make_name(Prefix,F/A,Name) :-
atom_concat_list([Prefix,F,(/),A],Name).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Storetype dependent lookup
lookup_passive_head(Head,PreJoin,VarDict,Goal,AllSusps) :-
functor(Head,F,A),
get_store_type(F/A,StoreType),
lookup_passive_head(StoreType,Head,PreJoin,VarDict,Goal,AllSusps).
lookup_passive_head(default,Head,PreJoin,VarDict,Goal,AllSusps) :-
passive_head_via(Head,PreJoin,[],VarDict,Goal,Attr,AttrDict),
instantiate_pattern_goals(AttrDict),
get_max_constraint_index(N),
( N == 1 ->
AllSusps = Attr
;
functor(Head,F,A),
get_constraint_index(F/A,Pos),
make_attr(N,_,SuspsList,Attr),
nth(Pos,SuspsList,AllSusps)
).
lookup_passive_head(multi_hash(Indexes),Head,_PreJoin,VarDict,Goal,AllSusps) :-
once((
member(Index,Indexes),
multi_hash_key_args(Index,Head,KeyArgs),
translate(KeyArgs,VarDict,KeyArgCopies)
)),
( KeyArgCopies = [KeyCopy] ->
true
;
KeyCopy =.. [k|KeyArgCopies]
),
functor(Head,F,A),
multi_hash_via_lookup_name(F/A,Index,ViaName),
Goal =.. [ViaName,KeyCopy,AllSusps],
update_store_type(F/A,multi_hash([Index])).
lookup_passive_head(global_ground,Head,_PreJoin,_VarDict,Goal,AllSusps) :-
functor(Head,F,A),
global_ground_store_name(F/A,StoreName),
Goal = nb_getval(StoreName,AllSusps),
update_store_type(F/A,global_ground).
lookup_passive_head(global_singleton,Head,_PreJoin,_VarDict,Goal,AllSusps) :-
functor(Head,F,A),
global_singleton_store_name(F/A,StoreName),
Goal = (nb_getval(StoreName,Susp),Susp \== [],AllSusps = [Susp]),
update_store_type(F/A,global_singleton).
lookup_passive_head(multi_store(StoreTypes),Head,PreJoin,VarDict,Goal,AllSusps) :-
once((
member(ST,StoreTypes),
lookup_passive_head(ST,Head,PreJoin,VarDict,Goal,AllSusps)
)).
existential_lookup(global_singleton,Head,_PreJoin,_VarDict,SuspTerm,State,Goal,Susp,Pairs,Pairs) :- !,
functor(Head,F,A),
global_singleton_store_name(F/A,StoreName),
Goal = (
nb_getval(StoreName,Susp),
Susp \== [],
Susp = SuspTerm
),
update_store_type(F/A,global_singleton).
existential_lookup(multi_store(StoreTypes),Head,PreJoin,VarDict,SuspTerm,State,Goal,Susp,Pairs,NPairs) :- !,
once((
member(ST,StoreTypes),
existential_lookup(ST,Head,PreJoin,VarDict,SuspTerm,State,Goal,Susp,Pairs,NPairs)
)).
existential_lookup(multi_hash(Indexes),Head,_PreJoin,VarDict,SuspTerm,State,Goal,Susp,Pairs,NPairs) :- !,
once((
member(Index,Indexes),
multi_hash_key_args(Index,Head,KeyArgs),
translate(KeyArgs,VarDict,KeyArgCopies)
)),
( KeyArgCopies = [KeyCopy] ->
true
;
KeyCopy =.. [k|KeyArgCopies]
),
functor(Head,F,A),
multi_hash_via_lookup_name(F/A,Index,ViaName),
LookupGoal =.. [ViaName,KeyCopy,AllSusps],
create_get_mutable(active,State,GetMutable),
Goal = (
LookupGoal,
'chr sbag_member'(Susp,AllSusps),
Susp = SuspTerm,
GetMutable
),
hash_index_filter(Pairs,Index,NPairs),
update_store_type(F/A,multi_hash([Index])).
existential_lookup(StoreType,Head,PreJoin,VarDict,SuspTerm,State,Goal,Susp,Pairs,Pairs) :-
lookup_passive_head(StoreType,Head,PreJoin,VarDict,UGoal,Susps),
create_get_mutable(active,State,GetMutable),
Goal = (
UGoal,
'chr sbag_member'(Susp,Susps),
Susp = SuspTerm,
GetMutable
).
hash_index_filter(Pairs,Index,NPairs) :-
( integer(Index) ->
NIndex = [Index]
;
NIndex = Index
),
hash_index_filter(Pairs,NIndex,1,NPairs).
hash_index_filter([],_,_,[]).
hash_index_filter([P|Ps],Index,N,NPairs) :-
( Index = [I|Is] ->
NN is N + 1,
( I > N ->
NPairs = [P|NPs],
hash_index_filter(Ps,[I|Is],NN,NPs)
; I == N ->
NPairs = NPs,
hash_index_filter(Ps,Is,NN,NPs)
)
;
NPairs = [P|Ps]
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
assume_constraint_stores([]).
assume_constraint_stores([C|Cs]) :-
( \+ may_trigger(C),
is_stored(C),
get_store_type(C,default) ->
get_indexed_arguments(C,IndexedArgs),
findall(Index,(sublist(Index,IndexedArgs), Index \== []),Indexes),
( get_functional_dependency(C,1,Pattern,Key),
all_distinct_var_args(Pattern), Key == [] ->
assumed_store_type(C,global_singleton)
;
assumed_store_type(C,multi_store([multi_hash(Indexes),global_ground]))
)
;
true
),
assume_constraint_stores(Cs).
all_distinct_var_args(Term) :-
Term =.. [_|Args],
copy_term_nat(Args,NArgs),
all_distinct_var_args_(NArgs).
all_distinct_var_args_([]).
all_distinct_var_args_([X|Xs]) :-
var(X),
X = t,
all_distinct_var_args_(Xs).
get_indexed_arguments(C,IndexedArgs) :-
C = F/A,
get_indexed_arguments(1,A,C,IndexedArgs).
get_indexed_arguments(I,N,C,L) :-
( I > N ->
L = []
; ( is_indexed_argument(C,I) ->
L = [I|T]
;
L = T
),
J is I + 1,
get_indexed_arguments(J,N,C,T)
).
validate_store_type_assumptions([]).
validate_store_type_assumptions([C|Cs]) :-
validate_store_type_assumption(C),
validate_store_type_assumptions(Cs).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% new code generation
universal_search_iterator_end([CurrentHead|PrevHeads],NextHeads,Rule,F/A,Id,L,T) :-
Rule = rule(_,_,Guard,Body),
gen_var_susp_list_for(PrevHeads,[CurrentHead,NextHeads,Guard,Body],_,VarsAndSusps,AllButFirst,FirstSusp),
Vars = [ [] | VarsAndSusps],
build_head(F,A,Id,Vars,Head),
( Id = [0|_] ->
next_id(Id,PrevId),
PrevVarsAndSusps = AllButFirst
;
dec_id(Id,PrevId),
PrevVarsAndSusps = [FirstSusp|AllButFirst]
),
build_head(F,A,PrevId,PrevVarsAndSusps,PredecessorCall),
Clause = ( Head :- PredecessorCall),
L = [Clause | T].
universal_search_iterator([NextHead|RestHeads],[CurrentHead|PreHeads],Rule,F/A,Id,L,T) :-
Rule = rule(_,_,Guard,Body),
pre_vars_and_susps(PreHeads,[CurrentHead,NextHead,RestHeads,Guard,Body],PreVarsAndSusps,VarDict,PreSusps),
gen_var(OtherSusps),
functor(CurrentHead,OtherF,OtherA),
gen_vars(OtherA,OtherVars),
head_info(CurrentHead,OtherA,OtherVars,OtherSusp,_VarsSusp,HeadPairs),
get_constraint_mode(OtherF/OtherA,Mode),
head_arg_matches(HeadPairs,Mode,VarDict,FirstMatching,VarDict1),
OtherSuspension =.. [suspension,_,State,_,_,_,_|OtherVars],
different_from_other_susps(CurrentHead,OtherSusp,PreHeads,PreSusps,DiffSuspGoals),
create_get_mutable(active,State,GetMutable),
CurrentSuspTest = (
OtherSusp = OtherSuspension,
GetMutable,
DiffSuspGoals,
FirstMatching
),
lookup_passive_head(NextHead,[CurrentHead|PreHeads],VarDict1,NextSuspGoal,NextSusps),
inc_id(Id,NestedId),
ClauseVars = [[OtherSusp|OtherSusps]|PreVarsAndSusps],
build_head(F,A,Id,ClauseVars,ClauseHead),
passive_delegate_variables(CurrentHead,PreHeads,[NextHead,RestHeads,Guard,Body],VarDict1,CurrentHeadVars),
append([NextSusps|CurrentHeadVars],[OtherSusp,OtherSusps|PreVarsAndSusps],NestedVars),
build_head(F,A,NestedId,NestedVars,NestedHead),
RecursiveVars = [OtherSusps|PreVarsAndSusps],
build_head(F,A,Id,RecursiveVars,RecursiveHead),
Clause = (
ClauseHead :-
( CurrentSuspTest,
NextSuspGoal
->
NestedHead
; RecursiveHead
)
),
L = [Clause|T].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Observation Analysis
%
% CLASSIFICATION
% Enabled
%
% Analysis based on Abstract Interpretation paper.
%
% TODO:
% stronger analysis domain [research]
constraints
initial_call_pattern/1,
call_pattern/1,
final_answer_pattern/2,
abstract_constraints/1,
depends_on/2,
depends_on_ap/4,
depends_on_goal/2,
ai_observed/2,
ai_not_observed/2,
ai_is_observed/2,
depends_on_as/3.
option(mode,initial_call_pattern(+)).
option(mode,call_pattern(+)).
option(mode,final_answer_pattern(+,+)).
option(mode,abstract_constraints(+)).
option(mode,depends_on(+,+)).
option(mode,depends_on_as(+,+,+)).
option(mode,depends_on_ap(+,+,+,+)).
option(mode,depends_on_goal(+,+)).
option(mode,ai_observed(+,+)).
option(mode,ai_is_observed(+,+)).
option(mode,ai_not_observed(+,+)).
ai_observed(C,O) \ ai_not_observed(C,O) <=> true.
ai_not_observed(C,O) \ ai_not_observed(C,O) <=> true.
ai_observed(C,O) \ ai_observed(C,O) <=> true.
ai_not_observed(C,O) \ ai_is_observed(C,O) <=> fail.
ai_is_observed(_,_) <=> true.
ai_observation_analysis(ACs) :-
( chr_pp_flag(ai_observation_analysis,on) ->
list_to_ord_set(ACs,ACSet),
abstract_constraints(ACs),
ai_observation_schedule_initial_calls(ACs)
;
true
).
ai_observation_schedule_initial_calls([]).
ai_observation_schedule_initial_calls([AC|ACs]) :-
ai_observation_schedule_initial_call(AC),
ai_observation_schedule_initial_calls(ACs).
ai_observation_schedule_initial_call(AC) :-
ai_observation_top(AC,CallPattern),
initial_call_pattern(CallPattern).
ai_observation_schedule_new_calls([],AP).
ai_observation_schedule_new_calls([AC|ACs],AP) :-
AP = odom(_,Set),
initial_call_pattern(odom(AC,Set)),
ai_observation_schedule_new_calls(ACs,AP).
final_answer_pattern(CP,AP1) \ final_answer_pattern(CP,AP2)
<=>
ai_observation_leq(AP2,AP1)
|
true.
initial_call_pattern(CP) \ initial_call_pattern(CP) <=> true.
initial_call_pattern(CP) ==> call_pattern(CP).
initial_call_pattern(CP), final_answer_pattern(CP,AP),
abstract_constraints(ACs) ==>
ai_observation_schedule_new_calls(ACs,AP).
call_pattern(CP) \ call_pattern(CP) <=> true.
depends_on(CP1,CP2), final_answer_pattern(CP2,AP) ==>
final_answer_pattern(CP1,AP).
% AbstractGoala
call_pattern(odom([],Set)) ==>
final_answer_pattern(odom([],Set),odom([],Set)).
% AbstractGoalb
call_pattern(odom([G|Gs],Set)) ==>
CP1 = odom(G,Set),
depends_on_goal(odom([G|Gs],Set),CP1),
call_pattern(CP1).
depends_on_goal(CP1,CP2), final_answer_pattern(CP2,AP2) \ depends_on(CP1,_)
<=> true.
depends_on_goal(CP1,CP2), final_answer_pattern(CP2,AP2)
==>
CP1 = odom([_|Gs],_),
AP2 = odom([],Set),
CCP = odom(Gs,Set),
call_pattern(CCP),
depends_on(CP1,CCP).
% AbstractSolve
call_pattern(odom(builtin,Set)) ==>
% writeln(' - AbstractSolve'),
ord_empty(EmptySet),
final_answer_pattern(odom(builtin,Set),odom([],EmptySet)).
% AbstractDrop
call_pattern(odom(occ(C,O),Set)), max_occurrence(C,MO) ==>
O > MO |
% writeln(' - AbstractDrop'),
final_answer_pattern(odom(occ(C,O),Set),odom([],Set)).
% AbstractActivate
call_pattern(odom(AC,Set)), abstract_constraints(ACs)
==>
memberchk_eq(AC,ACs)
|
% writeln(' - AbstractActivate'),
CP = odom(occ(AC,1),Set),
call_pattern(CP),
depends_on(odom(AC,Set),CP).
% AbstractSimplify
call_pattern(odom(occ(C,O),Set)), abstract_constraints(ACs), occurrence(C,O,RuleNb,ID), rule(RuleNb,Rule) ==>
Rule = pragma(rule(H1,H2,G,Body),ids(IDs1,_),_,_,_),
memberchk_eq(ID,IDs1) |
% writeln(' - AbstractSimplify'),
% SIMPLIFICATION
select2(ID,_,IDs1,H1,_,RestH1),
ai_observation_abstract_constraints(RestH1,ACs,ARestHeads),
ai_observation_observe_list(odom([],Set),ARestHeads,odom([],Set1)),
ai_observation_abstract_constraints(H2,ACs,AH2),
ai_observation_observe_list(odom([],Set1),AH2,odom([],Set2)),
ai_observation_abstract_goal(Body,ACs,AG),
call_pattern(odom(AG,Set2)),
% DEFAULT
NO is O + 1,
DCP = odom(occ(C,NO),Set),
call_pattern(DCP),
depends_on_as(odom(occ(C,O),Set),odom(AG,Set2),DCP).
depends_on_as(CP,CPS,CPD),
final_answer_pattern(CPS,APS),
final_answer_pattern(CPD,APD) ==>
ai_observation_lub(APS,APD,AP),
final_answer_pattern(CP,AP).
% AbstractPropagate
call_pattern(odom(occ(C,O),Set)), abstract_constraints(ACs), occurrence(C,O,RuleNb,ID), rule(RuleNb,Rule) ==>
Rule = pragma(rule(H1,H2,G,Body),ids(_,IDs2),_,_,_),
memberchk_eq(ID,IDs2)
|
% writeln(' - AbstractPropagate'),
% observe partners
select2(ID,_,IDs2,H2,_,RestH2),
ai_observation_abstract_constraints(RestH2,ACs,ARestHeads),
ai_observation_observe_list(odom([],Set),ARestHeads,odom([],Set1)),
ai_observation_abstract_constraints(H1,ACs,AH1),
ai_observation_observe_list(odom([],Set1),AH1,odom([],Set2)),
ord_add_element(Set2,C,Set3),
ai_observation_abstract_goal(Body,ACs,AG),
call_pattern(odom(AG,Set3)),
( ord_memberchk(C,Set2) ->
Delete = no
;
Delete = yes
),
% DEFAULT
NO is O + 1,
DCP = odom(occ(C,NO),Set),
call_pattern(DCP),
depends_on_ap(odom(occ(C,O),Set),odom(AG,Set3),DCP,Delete).
depends_on_ap(CP,CPP,CPD,Delete), final_answer_pattern(CPD,APD) ==>
true |
final_answer_pattern(CP,APD).
depends_on_ap(CP,CPP,CPD,Delete), final_answer_pattern(CPP,APP),
final_answer_pattern(CPD,APD) ==>
true |
CP = odom(occ(C,O),_),
( ai_observation_is_observed(APP,C) ->
ai_observed(C,O)
;
ai_not_observed(C,O)
),
( Delete == yes ->
APP = odom([],Set0),
ord_del_element(Set0,C,Set),
NAPP = odom([],Set)
;
NAPP = APP
),
ai_observation_lub(NAPP,APD,AP),
final_answer_pattern(CP,AP).
ai_observation_lub(odom(AG,S1),odom(AG,S2),odom(AG,S3)) :-
ord_intersect(S1,S2,S3).
ai_observation_top(AG,odom(AG,EmptyS)) :-
ord_empty(EmptyS).
ai_observation_leq(odom(AG,S1),odom(AG,S2)) :-
ord_subset(S2,S1).
ai_observation_observe(odom(AG,S),AC,odom(AG,NS)) :-
ord_del_element(S,AC,NS).
ai_observation_observe_list(odom(AG,S),ACs,odom(AG,NS)) :-
list_to_ord_set(ACs,ACSet),
ord_subtract(S,ACSet,NS).
ai_observation_abstract_constraint(C,ACs,AC) :-
functor(C,F,A),
AC = F / A,
member(AC,ACs).
ai_observation_abstract_constraints(Cs,ACs,NACs) :-
findall(NAC,(member(C,Cs),ai_observation_abstract_constraint(C,ACs,NAC)),NACs).
ai_observation_abstract_goal(G,ACs,AG) :-
ai_observation_abstract_goal(G,ACs,AG,[]).
ai_observation_abstract_goal((G1,G2),ACs,List,Tail) :- !, % conjunction
ai_observation_abstract_goal(G1,ACs,List,IntermediateList),
ai_observation_abstract_goal(G2,ACs,IntermediateList,Tail).
ai_observation_abstract_goal((G1;G2),ACs,List,Tail) :- !, % disjunction
ai_observation_abstract_goal(G1,ACs,List,IntermediateList),
ai_observation_abstract_goal(G2,ACs,IntermediateList,Tail).
ai_observation_abstract_goal((G1->G2),ACs,List,Tail) :- !, % if-then
ai_observation_abstract_goal(G1,ACs,List,IntermediateList),
ai_observation_abstract_goal(G2,ACs,IntermediateList,Tail).
ai_observation_abstract_goal(C,ACs,[AC|Tail],Tail) :-
ai_observation_abstract_constraint(C,ACs,AC), !. % CHR constraint
ai_observation_abstract_goal(true,_,Tail,Tail) :- !.
ai_observation_abstract_goal(writeln(_),_,Tail,Tail) :- !.
ai_observation_abstract_goal(G,_,[AG|Tail],Tail) :-
AG = builtin. % default case if goal is not recognized
ai_observation_is_observed(odom(_,ACSet),AC) :-
\+ ord_memberchk(AC,ACSet).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
unconditional_occurrence(C,O) :-
get_occurrence(C,O,RuleNb,ID),
get_rule(RuleNb,PRule),
PRule = pragma(ORule,_,_,_,_),
copy_term_nat(ORule,Rule),
Rule = rule(H1,H2,Guard,_),
guard_entailment:entails_guard([chr_pp_headvariables(H1,H2)],Guard),
once((
H1 = [Head], H2 == []
;
H2 = [Head], H1 == [], \+ may_trigger(C)
)),
functor(Head,F,A),
Head =.. [_|Args],
unconditional_occurrence_args(Args).
unconditional_occurrence_args([]).
unconditional_occurrence_args([X|Xs]) :-
var(X),
X = x,
unconditional_occurrence_args(Xs).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Generate rules that implement chr_show_store/1 functionality.
%
% CLASSIFICATION
% Experimental
% Unused
%
% Generates additional rules:
%
% $show, C1 # ID ==> writeln(C1) pragma passive(ID).
% ...
% $show, Cn # ID ==> writeln(Cn) pragma passive(ID).
% $show <=> true.
generate_show_constraint(Constraints0,Constraints,Rules0,Rules) :-
( chr_pp_flag(show,on) ->
Constraints = ['$show'/0|Constraints0],
generate_show_rules(Constraints0,Rules,[Rule|Rules0]),
inc_rule_count(RuleNb),
Rule = pragma(
rule(['$show'],[],true,true),
ids([0],[]),
[],
no,
RuleNb
)
;
Constraints = Constraints0,
Rules = Rules0
).
generate_show_rules([],Rules,Rules).
generate_show_rules([F/A|Rest],[Rule|Tail],Rules) :-
functor(C,F,A),
inc_rule_count(RuleNb),
Rule = pragma(
rule([],['$show',C],true,writeln(C)),
ids([],[0,1]),
[passive(1)],
no,
RuleNb
),
generate_show_rules(Rest,Tail,Rules).
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