/*  $Id$

    Part of CHR (Constraint Handling Rules)

    Author:        Tom Schrijvers
    E-mail:        Tom.Schrijvers@cs.kuleuven.be
    WWW:           http://www.swi-prolog.org
    Copyright (C): 2005-2006, 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  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.
*/
:- module(chr_compiler_options,
	[ handle_option/2
	, init_chr_pp_flags/0
	, chr_pp_flag/2
	]).
	
%% SICStus begin
%% :- use_module(hprolog, [nb_setval/2,nb_getval/2]).
%% local_current_prolog_flag(_,_) :- fail.
%% SICStus end

%% SWI begin
local_current_prolog_flag(X,Y) :- current_prolog_flag(X,Y).
%% SWI end


:- use_module(chr_compiler_errors).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Global Options
%

handle_option(Name,Value) :- 
	var(Name), !,
	chr_error(syntax((:- chr_option(Name,Value))),'First argument should be an atom, not a variable.\n',[]).

handle_option(Name,Value) :- 
	var(Value), !,
	chr_error(syntax((:- chr_option(Name,Value))),'Second argument cannot be a variable.\n',[]).

handle_option(Name,Value) :-
	option_definition(Name,Value,Flags),
	!,
	set_chr_pp_flags(Flags).

handle_option(Name,Value) :- 
	\+ option_definition(Name,_,_), !,
	chr_error(syntax((:- chr_option(Name,Value))),'Invalid option name ~w: consult the manual for valid options.\n',[Name]).

handle_option(Name,Value) :- 
	chr_error(syntax((:- chr_option(Name,Value))),'Invalid option value ~w: consult the manual for valid option values.\n',[Value]).

option_definition(optimize,experimental,Flags) :-
	Flags = [ functional_dependency_analysis  - on,
                  check_unnecessary_active - full,
		  reorder_heads		   - on,
		  set_semantics_rule	   - on,
		  storage_analysis	   - on,
		  guard_via_reschedule     - on,
		  guard_simplification	   - on,
		  check_impossible_rules   - on,
		  occurrence_subsumption   - on,
		  observation_analysis	   - on,
		  ai_observation_analysis  - on,
		  late_allocation	   - on,
		  reduced_indexing	   - on,
		  term_indexing		   - on,
                  inline_insertremove      - on,
		  mixed_stores		   - on
		].
option_definition(optimize,full,Flags) :-
	Flags = [ functional_dependency_analysis  - on,
                  check_unnecessary_active - full,
		  reorder_heads		   - on,
		  set_semantics_rule	   - on,
		  storage_analysis	   - on,
		  guard_via_reschedule     - on,
		  guard_simplification	   - on,
		  check_impossible_rules   - on,
		  occurrence_subsumption   - on,
		  observation_analysis	   - on,
		  ai_observation_analysis  - on,
		  late_allocation	   - on,
		  reduced_indexing	   - on,
                  inline_insertremove      - on,
		  mixed_stores		   - off,
		  debugable		   - off
		].

option_definition(optimize,off,Flags) :-
	Flags = [ functional_dependency_analysis  - off,
                  check_unnecessary_active - off,
		  reorder_heads		   - off,
		  set_semantics_rule	   - off,
		  storage_analysis	   - off,
		  guard_via_reschedule     - off,
		  guard_simplification	   - off,
		  check_impossible_rules   - off,
		  occurrence_subsumption   - off,
		  observation_analysis     - off,
		  ai_observation_analysis  - off,
		  late_allocation	   - off,
		  reduced_indexing	   - off
		].

option_definition(functional_dependency_analysis,on,Flags) :-
	Flags = [ functional_dependency_analysis - on ].
option_definition(functional_dependency_analysis,off,Flags) :-
	Flags = [ functional_dependency_analysis - off ].

option_definition(set_semantics_rule,on,Flags) :-
	Flags = [ set_semantics_rule - on ].
option_definition(set_semantics_rule,off,Flags) :-
	Flags = [ set_semantics_rule - off ].

option_definition(check_unnecessary_active,full,Flags) :-
	Flags = [ check_unnecessary_active - full ].
option_definition(check_unnecessary_active,simplification,Flags) :-
	Flags = [ check_unnecessary_active - simplification ].
option_definition(check_unnecessary_active,off,Flags) :-
	Flags = [ check_unnecessary_active - off ].

option_definition(check_guard_bindings,on,Flags) :-
	Flags = [ guard_locks - on ].
option_definition(check_guard_bindings,off,Flags) :-
	Flags = [ guard_locks - off ].
option_definition(check_guard_bindings,error,Flags) :-
	Flags = [ guard_locks - error ].

option_definition(reduced_indexing,on,Flags) :-
	Flags = [ reduced_indexing - on ].
option_definition(reduced_indexing,off,Flags) :-
	Flags = [ reduced_indexing - off ].

option_definition(storage_analysis,on,Flags) :-
	Flags = [ storage_analysis - on ].
option_definition(storage_analysis,off,Flags) :-
	Flags = [ storage_analysis - off ].

option_definition(guard_simplification,on,Flags) :-
	Flags = [ guard_simplification - on ].
option_definition(guard_simplification,off,Flags) :-
	Flags = [ guard_simplification - off ].

option_definition(check_impossible_rules,on,Flags) :-
	Flags = [ check_impossible_rules - on ].
option_definition(check_impossible_rules,off,Flags) :-
	Flags = [ check_impossible_rules - off ].

option_definition(occurrence_subsumption,on,Flags) :-
	Flags = [ occurrence_subsumption - on ].
option_definition(occurrence_subsumption,off,Flags) :-
	Flags = [ occurrence_subsumption - off ].

option_definition(late_allocation,on,Flags) :-
	Flags = [ late_allocation - on ].
option_definition(late_allocation,off,Flags) :-
	Flags = [ late_allocation - off ].

option_definition(inline_insertremove,on,Flags) :-
	Flags = [ inline_insertremove - on ].
option_definition(inline_insertremove,off,Flags) :-
	Flags = [ inline_insertremove - off ].

option_definition(type_definition,TypeDef,[]) :-
	( nonvar(TypeDef) ->
	TypeDef = type(T,D),
	chr_translate:type_definition(T,D)
	; true).
option_definition(type_declaration,TypeDecl,[]) :-
	( nonvar(TypeDecl) ->
	functor(TypeDecl,F,A),
	TypeDecl =.. [_|ArgTypes],
	chr_translate:constraint_type(F/A,ArgTypes)
	; true).
	
option_definition(mode,ModeDecl,[]) :-
	( nonvar(ModeDecl) ->
	functor(ModeDecl,F,A),
	ModeDecl =.. [_|ArgModes],
	chr_translate:constraint_mode(F/A,ArgModes)
	; true).
option_definition(store,FA-Store,[]) :-
	chr_translate:store_type(FA,Store).

%------------------------------------------------------------------------------%
option_definition(declare_stored_constraints,off,[declare_stored_constraints-off]).
option_definition(declare_stored_constraints,on ,[declare_stored_constraints-on]).

option_definition(stored,F/A,[]) :-
	chr_translate:stored_assertion(F/A).
%------------------------------------------------------------------------------%
option_definition(experiment,off,[experiment-off]).
option_definition(experiment,on,[experiment-on]).
option_definition(experimental,off,[experiment-off]).
option_definition(experimental,on,[experiment-on]).
option_definition(sss,off,[sss-off]).
option_definition(sss,on,[sss-on]).
%------------------------------------------------------------------------------%
option_definition(debug,off,Flags) :-
        option_definition(optimize,full,Flags2),
        Flags = [ debugable - off | Flags2].
option_definition(debug,on,Flags) :-
	( local_current_prolog_flag(generate_debug_info,false) ->
		% TODO: should not be allowed when nodebug flag is set in SWI-Prolog
		chr_warning(any,':- chr_option(debug,on) inconsistent with current_prolog_flag(generate_debug_info,off\n\tCHR option is ignored!\n)',[]),
		Flags = []
	;
       		Flags = [ debugable - on ]
	).

option_definition(store_counter,off,[]).
option_definition(store_counter,on,[store_counter-on]).

option_definition(observation,off,Flags) :-
	Flags = [
			observation_analysis - off,
			ai_observation_analysis - off,
			late_allocation - off,
			storage_analysis - off
		].
option_definition(observation,on,Flags) :-
	Flags = [
			observation_analysis - on,
			ai_observation_analysis - on
		].
option_definition(observation,regular,Flags) :-
	Flags = [
			observation_analysis - on,
			ai_observation_analysis - off
		].
option_definition(observation,ai,Flags) :-
	Flags = [
			observation_analysis - off,
			ai_observation_analysis - on
		].

option_definition(store_in_guards, on, [store_in_guards - on]).
option_definition(store_in_guards, off, [store_in_guards - off]).

option_definition(solver_events,NMod,Flags) :-
	Flags =	[solver_events - NMod].

option_definition(toplevel_show_store,on,Flags) :-
	Flags = [toplevel_show_store - on].

option_definition(toplevel_show_store,off,Flags) :-
	Flags = [toplevel_show_store - off].

option_definition(term_indexing,on,Flags) :-
	Flags = [term_indexing - on].
option_definition(term_indexing,off,Flags) :-
	Flags = [term_indexing - off].

option_definition(verbosity,on,Flags) :-
	Flags = [verbosity - on].
option_definition(verbosity,off,Flags) :-
	Flags = [verbosity - off].

option_definition(ht_removal,on,Flags) :-
	Flags = [ht_removal - on].
option_definition(ht_removal,off,Flags) :-
	Flags = [ht_removal - off].

option_definition(mixed_stores,on,Flags) :-
	Flags = [mixed_stores - on].
option_definition(mixed_stores,off,Flags) :-
	Flags = [mixed_stores - off].	

option_definition(line_numbers,on,Flags) :-
	Flags = [line_numbers - on].
option_definition(line_numbers,off,Flags) :-
	Flags = [line_numbers - off].

option_definition(dynattr,on,Flags) :-
	Flags = [dynattr - on].
option_definition(dynattr,off,Flags) :-
	Flags = [dynattr - off].

option_definition(verbose,off,[verbose-off]).
option_definition(verbose,on,[verbose-on]).

option_definition(dump,off,[dump-off]).
option_definition(dump,on,[dump-on]).

init_chr_pp_flags :-
	chr_pp_flag_definition(Name,[DefaultValue|_]),
	set_chr_pp_flag(Name,DefaultValue),
	fail.
init_chr_pp_flags.		

set_chr_pp_flags([]).
set_chr_pp_flags([Name-Value|Flags]) :-
	set_chr_pp_flag(Name,Value),
	set_chr_pp_flags(Flags).

set_chr_pp_flag(Name,Value) :-
	atom_concat('$chr_pp_',Name,GlobalVar),
	nb_setval(GlobalVar,Value).

chr_pp_flag_definition(functional_dependency_analysis,[off,on]).
chr_pp_flag_definition(check_unnecessary_active,[off,full,simplification]).
chr_pp_flag_definition(reorder_heads,[off,on]).
chr_pp_flag_definition(set_semantics_rule,[off,on]).
chr_pp_flag_definition(guard_via_reschedule,[off,on]).
chr_pp_flag_definition(guard_locks,[on,off,error]).
chr_pp_flag_definition(storage_analysis,[off,on]).
chr_pp_flag_definition(debugable,[on,off]).
chr_pp_flag_definition(reduced_indexing,[off,on]).
chr_pp_flag_definition(observation_analysis,[off,on]).
chr_pp_flag_definition(ai_observation_analysis,[off,on]).
chr_pp_flag_definition(store_in_guards,[off,on]).
chr_pp_flag_definition(late_allocation,[off,on]).
chr_pp_flag_definition(store_counter,[off,on]).
chr_pp_flag_definition(guard_simplification,[off,on]).
chr_pp_flag_definition(check_impossible_rules,[off,on]).
chr_pp_flag_definition(occurrence_subsumption,[off,on]).
chr_pp_flag_definition(observation,[off,on]).
chr_pp_flag_definition(show,[off,on]).
chr_pp_flag_definition(inline_insertremove,[on,off]).
chr_pp_flag_definition(solver_events,[none,_]).
chr_pp_flag_definition(toplevel_show_store,[on,off]).
chr_pp_flag_definition(term_indexing,[off,on]).
chr_pp_flag_definition(verbosity,[on,off]).
chr_pp_flag_definition(ht_removal,[off,on]).
chr_pp_flag_definition(mixed_stores,[on,off]).
chr_pp_flag_definition(line_numbers,[off,on]).
chr_pp_flag_definition(dynattr,[off,on]).
chr_pp_flag_definition(experiment,[off,on]).
chr_pp_flag_definition(sss,[off,on]).
	% emit compiler inferred code
chr_pp_flag_definition(verbose,[off,on]).
	% emit input code and output code
chr_pp_flag_definition(dump,[off,on]).

chr_pp_flag_definition(declare_stored_constraints,[off,on]).

chr_pp_flag(Name,Value) :-
	atom_concat('$chr_pp_',Name,GlobalVar),
	nb_getval(GlobalVar,V),
	( V == [] ->
		chr_pp_flag_definition(Name,[Value|_])
	;
		V = Value
	).
	

% TODO: add whatever goes wrong with (debug,on), (optimize,full) combo here!
% trivial example of what does go wrong:
%	b <=> true.
% !!!
sanity_check :-
	chr_pp_flag(store_in_guards, on),
	chr_pp_flag(ai_observation_analysis, on),
	chr_warning(any, 'ai_observation_analysis should be turned off when using store_in_guards\n', []),
	fail.
sanity_check.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%