[m-rev.] diff: improving the debugging of mode analysis

Zoltan Somogyi zs at cs.mu.OZ.AU
Thu Feb 24 11:40:58 AEDT 2005
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compiler/mode_debug.m:
	Streamline the facilities for debugging of the modechecking proces,
	to provide some hope of them being applicable to the debugging of
	performance problems that arise when modechecking large procedures.

	Do not print the list of variables whose instantiation state is
	unchanged unless asked to do so via the new option
	--debug-modes-verbose.

	Look up option values at fewer points.

	Allow the dumping of traces for the mode checking of a selected
	predicate only, via the new options --debug-modes-pred-id.

compiler/mode_info.m:
	Make the data structure we use to record the instmap at the last
	checkpoint be the instmap, which is searchable in log-n time,
	instead of an assoc list, which is searchable only in linear time.
	When N is the tens of thousands, this matters a lot.

	Extend the data structure to store the results of option lookups.
	Compensate for this by moving the rarely used parts of mode_info
	into a separate, rarely updated data structure.

compiler/handle_options.m:
	Make the two new options imply the old --debug-modes.

compiler/options.m:
doc/user_guide.texi:
	Handle and document the two new options.

Zoltan.

cvs diff: Diffing .
cvs diff: Diffing analysis
cvs diff: Diffing bindist
cvs diff: Diffing boehm_gc
cvs diff: Diffing boehm_gc/Mac_files
cvs diff: Diffing boehm_gc/cord
cvs diff: Diffing boehm_gc/cord/private
cvs diff: Diffing boehm_gc/doc
cvs diff: Diffing boehm_gc/include
cvs diff: Diffing boehm_gc/include/private
cvs diff: Diffing boehm_gc/tests
cvs diff: Diffing browser
cvs diff: Diffing bytecode
cvs diff: Diffing compiler
Index: compiler/handle_options.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/handle_options.m,v
retrieving revision 1.219
diff -u -b -r1.219 handle_options.m
--- compiler/handle_options.m	15 Feb 2005 05:22:16 -0000	1.219
+++ compiler/handle_options.m	23 Feb 2005 04:15:51 -0000
@@ -700,6 +700,14 @@
 		[]
 	),
 
+	option_implies(debug_modes_verbose, debug_modes, bool(yes)),
+	globals__io_lookup_int_option(debug_modes_pred_id, DebugModesPredId),
+	( { DebugModesPredId > 0 } ->
+		globals__io_set_option(debug_modes, bool(yes))
+	;
+		[]
+	),
+
 	globals__io_lookup_int_option(debug_opt_pred_id, DebugOptPredId),
 	( { DebugOptPredId > 0 } ->
 		globals__io_set_option(debug_opt, bool(yes))
Index: compiler/mode_debug.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/mode_debug.m,v
retrieving revision 1.18
diff -u -b -r1.18 mode_debug.m
--- compiler/mode_debug.m	23 Dec 2004 06:49:16 -0000	1.18
+++ compiler/mode_debug.m	17 Feb 2005 13:47:13 -0000
@@ -54,20 +54,19 @@
 	% This code is used to trace the actions of the mode checker.
 
 mode_checkpoint(Port, Msg, !ModeInfo, !IO) :-
-	mode_info_get_module_info(!.ModeInfo, ModuleInfo),
-	module_info_globals(ModuleInfo, Globals),
-	globals__lookup_bool_option(Globals, debug_modes, DoCheckPoint),
-	( DoCheckPoint = yes ->
-		mode_checkpoint_2(Port, Msg, !ModeInfo, !IO)
+	mode_info_get_debug_modes(!.ModeInfo, DebugModes),
+	(
+		DebugModes = yes(Verbose - Statistics),
+		mode_checkpoint_write(Verbose, Statistics, Port, Msg,
+			!ModeInfo, !IO)
 	;
-		true
+		DebugModes = no
 	).
 
-:- pred mode_checkpoint_2(port::in, string::in, mode_info::in, mode_info::out,
-	io::di, io::uo) is det.
+:- pred mode_checkpoint_write(bool::in, bool::in, port::in, string::in,
+	mode_info::in, mode_info::out, io::di, io::uo) is det.
 
-mode_checkpoint_2(Port, Msg, !ModeInfo, !IO) :-
-	mode_info_get_last_checkpoint_insts(!.ModeInfo, OldInsts),
+mode_checkpoint_write(Verbose, Statistics, Port, Msg, !ModeInfo, !IO) :-
 	mode_info_get_errors(!.ModeInfo, Errors),
 	( Port = enter ->
 		io__write_string("Enter ", !IO),
@@ -83,48 +82,58 @@
 		Detail = no
 	),
 	io__write_string(Msg, !IO),
-	( Detail = yes ->
+	(
+		Detail = yes,
 		io__write_string(":\n", !IO),
-		globals__io_lookup_bool_option(statistics, Statistics, !IO),
 		maybe_report_stats(Statistics, !IO),
 		maybe_flush_output(Statistics, !IO),
 		mode_info_get_instmap(!.ModeInfo, InstMap),
 		( instmap__is_reachable(InstMap) ->
 			instmap__to_assoc_list(InstMap, NewInsts),
+			mode_info_get_last_checkpoint_insts(!.ModeInfo,
+				OldInstMap),
 			mode_info_get_varset(!.ModeInfo, VarSet),
 			mode_info_get_instvarset(!.ModeInfo, InstVarSet),
-			write_var_insts(NewInsts, OldInsts, VarSet, InstVarSet,
-				!IO)
+			write_var_insts(NewInsts, OldInstMap, VarSet,
+				InstVarSet, Verbose, !IO)
 		;
-			NewInsts = [],
 			io__write_string("\tUnreachable\n", !IO)
 		),
-		mode_info_set_last_checkpoint_insts(NewInsts, !ModeInfo)
+		mode_info_set_last_checkpoint_insts(InstMap, !ModeInfo)
 	;
-		true
+		Detail = no
 	),
 	io__write_string("\n", !IO),
 	io__flush_output(!IO).
 
-:- pred write_var_insts(assoc_list(prog_var, inst)::in,
-	assoc_list(prog_var, inst)::in, prog_varset::in, inst_varset::in,
-	io::di, io::uo) is det.
+:- pred write_var_insts(assoc_list(prog_var, inst)::in, instmap::in,
+	prog_varset::in, inst_varset::in, bool::in, io::di, io::uo) is det.
 
-write_var_insts([], _, _, _, !IO).
-write_var_insts([Var - Inst | VarInsts], OldInsts, VarSet, InstVarSet, !IO) :-
-	io__write_string("\t", !IO),
-	mercury_output_var(Var, VarSet, no, !IO),
-	io__write_string(" ::", !IO),
+write_var_insts([], _, _, _, _, !IO).
+write_var_insts([Var - Inst | VarInsts], OldInstMap, VarSet, InstVarSet,
+		Verbose, !IO) :-
 	(
-		assoc_list__search(OldInsts, Var, OldInst),
+		instmap__lookup_var(OldInstMap, Var, OldInst),
 		Inst = OldInst
 	->
+		(
+			Verbose = yes,
+			io__write_string("\t", !IO),
+			mercury_output_var(Var, VarSet, no, !IO),
+			io__write_string(" ::", !IO),
 		io__write_string(" unchanged\n", !IO)
 	;
+			Verbose = no
+		)
+	;
+		io__write_string("\t", !IO),
+		mercury_output_var(Var, VarSet, no, !IO),
+		io__write_string(" ::", !IO),
 		io__write_string("\n", !IO),
 		mercury_output_structured_inst(Inst, 2, InstVarSet, !IO)
 	),
-	write_var_insts(VarInsts, OldInsts, VarSet, InstVarSet, !IO).
+	write_var_insts(VarInsts, OldInstMap, VarSet, InstVarSet, Verbose,
+		!IO).
 
 %-----------------------------------------------------------------------------%
 %-----------------------------------------------------------------------------%
Index: compiler/mode_info.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/mode_info.m,v
retrieving revision 1.69
diff -u -b -r1.69 mode_info.m
--- compiler/mode_info.m	19 Jan 2005 03:10:46 -0000	1.69
+++ compiler/mode_info.m	18 Feb 2005 00:52:54 -0000
@@ -45,14 +45,6 @@
 			unify_context,	% original source of the unification
 			side		% LHS or RHS
 		)
-/**** Not yet used
-	;	unify_arg(
-			unify_context,
-			side,
-			cons_id,
-			int
-		)
-****/
 	;	uninitialized.
 
 :- type side ---> left ; right.
@@ -101,6 +93,8 @@
 :- pred mode_info_get_insts(mode_info::in, inst_table::out) is det.
 :- pred mode_info_get_predid(mode_info::in, pred_id::out) is det.
 :- pred mode_info_get_procid(mode_info::in, proc_id::out) is det.
+:- pred mode_info_get_debug_modes(mode_info::in, maybe(pair(bool))::out)
+	is det.
 :- pred mode_info_get_context(mode_info::in, prog_context::out) is det.
 :- pred mode_info_get_mode_context(mode_info::in, mode_context::out) is det.
 :- pred mode_info_get_instmap(mode_info::in, instmap::out) is det.
@@ -116,8 +110,8 @@
 :- pred mode_info_get_live_vars(mode_info::in, bag(prog_var)::out) is det.
 :- pred mode_info_get_nondet_live_vars(mode_info::in, bag(prog_var)::out)
 	is det.
-:- pred mode_info_get_last_checkpoint_insts(mode_info::in,
-	assoc_list(prog_var, inst)::out) is det.
+:- pred mode_info_get_last_checkpoint_insts(mode_info::in, instmap::out)
+	is det.
 :- pred mode_info_get_parallel_vars(mode_info::in,
 	list(pair(set(prog_var)))::out) is det.
 :- pred mode_info_get_changed_flag(mode_info::in, bool::out) is det.
@@ -164,7 +158,7 @@
 	mode_info::in, mode_info::out) is det.
 :- pred mode_info_set_nondet_live_vars(bag(prog_var)::in,
 	mode_info::in, mode_info::out) is det.
-:- pred mode_info_set_last_checkpoint_insts(assoc_list(prog_var, inst)::in,
+:- pred mode_info_set_last_checkpoint_insts(instmap::in,
 	mode_info::in, mode_info::out) is det.
 :- pred mode_info_set_parallel_vars(list(pair(set(prog_var)))::in,
 	mode_info::in, mode_info::out) is det.
@@ -238,39 +232,82 @@
 :- import_module check_hlds__delay_info.
 :- import_module check_hlds__mode_errors.
 :- import_module check_hlds__mode_util.
+:- import_module libs__globals.
+:- import_module libs__options.
 
-:- import_module svbag, string, term, varset.
+:- import_module svbag, int, string, term, varset.
 :- import_module require, std_util, queue.
 
+:- type mode_sub_info --->
+	mode_sub_info(
+		procid		:: proc_id,
+				% The mode which we are checking.
+
+		varset		:: prog_varset,
+				% The variables in the current proc.
+
+		last_checkpoint_insts :: instmap,
+				% This field is used by the checkpoint
+				% code when debug_modes is on.  It has the
+				% instmap that was current at the last
+				% mode checkpoint, so that checkpoints
+				% do not print out the insts of variables
+				% whose insts have not changed since the
+				% last checkpoint.  This field will always
+				% contain an unreachable instmap if debug_modes
+				% is off, since its information is not
+				% needed then.
+
+		changed_flag	:: bool,
+				% Changed flag: if `yes', then we may need
+				% to repeat mode inference.
+
+		checking_extra_goals :: bool
+				% Are we rechecking a goal after introducing
+				% unifications for complicated sub-unifications
+				% or an implied mode? If so, redoing the
+				% mode check should not introduce more
+				% extra unifications.
+	).
+
 :- type mode_info --->
 	mode_info(
 		module_info	:: module_info,
+
 		predid		:: pred_id,
-				% The pred we are checking
-		procid		:: proc_id,
-				% The mode which we are checking
-		varset		:: prog_varset,
-				% The variables in the current proc
+				% The pred we are checking.
+
 		var_types	:: vartypes,
-				% The types of the variables
+				% The types of the variables.
+
+		debug		:: maybe(pair(bool)),
+				% Is mode debugging of this procedure enabled?
+				% If yes, is verbose mode debugging enabled,
+				% and is statistics printing enabled?
+
 		context		:: prog_context,
 				% The line number of the subgoal we
-				% are currently checking
+				% are currently checking.
+
 		mode_context	:: mode_context,
 				% A description of where in the
-				% goal the error occurred
+				% goal the error occurred.
+
 		instmap		:: instmap,
 				% The current instantiatedness
-				% of the variables
+				% of the variables.
+
 		locked_vars	:: locked_vars,
 				% The "locked" variables,
 				% i.e. variables which cannot be
 				% further instantiated inside a
-				% negated context
+				% negated context.
+
 		delay_info	:: delay_info,
-				% info about delayed goals
+				% Info about delayed goals.
+
 		errors		:: list(mode_error_info),
-				% The mode errors found
+				% The mode errors found.
 
 		live_vars	:: bag(prog_var),
 				% The live variables, i.e. those variables
@@ -298,18 +335,6 @@
 
 		instvarset	:: inst_varset,
 
-		last_checkpoint_insts :: assoc_list(prog_var, inst),
-				% This field is used by the checkpoint
-				% code when debug_modes is on.  It has the
-				% instmap that was current at the last
-				% mode checkpoint, so that checkpoints
-				% do not print out the insts of variables
-				% whose insts have not changed since the
-				% last checkpoint.  This field will always
-				% contain an empty list if debug_modes
-				% is off, since its information is not
-				% needed then.
-
 		parallel_vars	:: list(pair(set(prog_var), set(prog_var))),
 				% A stack of pairs of sets of variables used
 				% to mode-check parallel conjunctions. The
@@ -321,32 +346,19 @@
 				% the stack is for the correct handling
 				% of nested parallel conjunctions.
 
-		changed_flag	:: bool,
-				% Changed flag
-				% If `yes', then we may need
-				% to repeat mode inference.
-
 		how_to_check	:: how_to_check_goal,
 
 		may_change_called_proc :: may_change_called_proc,
-				% Is mode analysis allowed
-				% to change which procedure
-				% is called?
-
-		checking_extra_goals :: bool,
-				% Are we rechecking a goal after
-				% introducing unifications for
-				% complicated sub-unifications
-				% or an implied mode?
-				% If so, redoing the mode check
-				% should not introduce more
-				% extra unifications.
+				% Is mode analysis allowed to change
+				% which procedure is called?
 
-		may_initialise_solver_vars :: bool
+		may_initialise_solver_vars :: bool,
 				% `yes' if calls to the initialisation
 				% predicates for solver vars can be
 				% inserted during mode analysis in order
 				% to make goals schedulable.
+
+		mode_sub_info	:: mode_sub_info
 	).
 
 %-----------------------------------------------------------------------------%
@@ -355,6 +367,25 @@
 
 mode_info_init(ModuleInfo, PredId, ProcId, Context, LiveVars, InstMapping0,
 		HowToCheck, MayChangeProc, ModeInfo) :-
+	module_info_globals(ModuleInfo, Globals),
+	globals__lookup_bool_option(Globals, debug_modes, DebugModes),
+	globals__lookup_int_option(Globals, debug_modes_pred_id,
+	DebugModesPredId),
+	pred_id_to_int(PredId, PredIdInt),
+	(
+		DebugModes = yes,
+		( DebugModesPredId >= 0 => DebugModesPredId = PredIdInt )
+	->
+		globals__lookup_bool_option(Globals, debug_modes_verbose,
+			DebugVerbose),
+		globals__lookup_bool_option(Globals, statistics,
+			Statistics),
+		Debug = yes(DebugVerbose - Statistics)
+	;
+		Debug = no
+	),
+
+	instmap__init_unreachable(Unreachable),
 	mode_context_init(ModeContext),
 	LockedVars = [],
 	delay_info__init(DelayInfo),
@@ -375,38 +406,45 @@
 	CheckingExtraGoals = no,
 	MayInitSolverVars = yes,
 
-	ModeInfo = mode_info(ModuleInfo, PredId, ProcId, VarSet, VarTypes,
+	ModeSubInfo = mode_sub_info(ProcId, VarSet, Unreachable, Changed,
+		CheckingExtraGoals
+	),
+
+	ModeInfo = mode_info(ModuleInfo, PredId, VarTypes, Debug,
 		Context, ModeContext, InstMapping0, LockedVars, DelayInfo,
-		ErrorList, LiveVarsBag, NondetLiveVarsBag, InstVarSet,
-		[], [], Changed, HowToCheck, MayChangeProc,
-		CheckingExtraGoals, MayInitSolverVars
+		ErrorList, LiveVarsBag, NondetLiveVarsBag, InstVarSet, [],
+		HowToCheck, MayChangeProc, MayInitSolverVars, ModeSubInfo
 	).
 
 %-----------------------------------------------------------------------------%
 
 mode_info_get_module_info(MI, MI ^ module_info).
 mode_info_get_predid(MI, MI ^ predid).
-mode_info_get_procid(MI, MI ^ procid).
-mode_info_get_varset(MI, MI ^ varset).
+mode_info_get_procid(MI, MI ^ mode_sub_info ^ procid).
+mode_info_get_debug_modes(MI, MI ^ debug).
+mode_info_get_varset(MI, MI ^ mode_sub_info ^ varset).
 mode_info_get_var_types(MI, MI ^ var_types).
 mode_info_get_context(MI, MI ^ context).
 mode_info_get_mode_context(MI, MI ^ mode_context).
 mode_info_get_instmap(MI, MI ^ instmap).
+mode_info_get_instvarset(ModeInfo, ModeInfo ^ instvarset).
 mode_info_get_locked_vars(MI, MI ^ locked_vars).
 mode_info_get_errors(MI, MI ^ errors).
 mode_info_get_delay_info(MI, MI ^ delay_info).
 mode_info_get_live_vars(MI, MI ^ live_vars).
 mode_info_get_nondet_live_vars(MI, MI ^ nondet_live_vars).
-mode_info_get_last_checkpoint_insts(MI, MI ^ last_checkpoint_insts).
+mode_info_get_last_checkpoint_insts(MI,
+	MI ^ mode_sub_info ^ last_checkpoint_insts).
 mode_info_get_parallel_vars(MI, MI ^  parallel_vars).
-mode_info_get_changed_flag(MI, MI ^ changed_flag).
+mode_info_get_changed_flag(MI, MI ^ mode_sub_info ^ changed_flag).
 mode_info_get_how_to_check(MI, MI ^ how_to_check).
-mode_info_get_may_change_called_proc(MI, MI ^ may_change_called_proc).
+mode_info_get_may_change_called_proc(MI,
+	MI ^ may_change_called_proc).
 
 mode_info_set_module_info(ModuleInfo, MI, MI ^ module_info := ModuleInfo).
 mode_info_set_predid(PredId, MI, MI ^ predid := PredId).
-mode_info_set_procid(ProcId, MI, MI ^ procid := ProcId).
-mode_info_set_varset(VarSet, MI, MI ^ varset := VarSet).
+mode_info_set_procid(ProcId, MI, MI ^ mode_sub_info ^ procid := ProcId).
+mode_info_set_varset(VarSet, MI, MI ^ mode_sub_info ^ varset := VarSet).
 mode_info_set_var_types(VTypes, MI, MI ^ var_types := VTypes).
 mode_info_set_context(Context, MI, MI ^ context := Context).
 mode_info_set_mode_context(ModeContext, MI, MI ^ mode_context := ModeContext).
@@ -417,9 +455,10 @@
 mode_info_set_nondet_live_vars(NondetLiveVars, MI,
 	MI ^ nondet_live_vars := NondetLiveVars).
 mode_info_set_last_checkpoint_insts(LastCheckpointInsts, MI,
-	MI ^ last_checkpoint_insts := LastCheckpointInsts).
+	MI ^ mode_sub_info ^ last_checkpoint_insts := LastCheckpointInsts).
 mode_info_set_parallel_vars(PVars, MI, MI ^ parallel_vars := PVars).
-mode_info_set_changed_flag(Changed, MI, MI ^ changed_flag := Changed).
+mode_info_set_changed_flag(Changed, MI,
+	MI ^ mode_sub_info ^ changed_flag := Changed).
 mode_info_set_how_to_check(How, MI, MI ^ how_to_check := How).
 mode_info_set_may_change_called_proc(MayChange, MI,
 	MI ^ may_change_called_proc := MayChange).
@@ -544,8 +583,6 @@
 
 %-----------------------------------------------------------------------------%
 
-mode_info_get_instvarset(ModeInfo, ModeInfo ^ instvarset).
-
 mode_info_get_types_of_vars(ModeInfo, Vars, TypesOfVars) :-
 	mode_info_get_var_types(ModeInfo, VarTypes),
 	map__apply_to_list(Vars, VarTypes, TypesOfVars).
@@ -591,7 +628,7 @@
 
 mode_info_set_checking_extra_goals(Checking, !MI) :-
 	(
-		yes = !.MI ^ checking_extra_goals,
+		yes = !.MI ^ mode_sub_info ^ checking_extra_goals,
 		Checking = yes
 	->
 		% This should never happen - once the extra goals are
@@ -600,7 +637,7 @@
 		error("mode analysis: rechecking extra goals " ++
 			"adds more extra goals")
 	;
-		!:MI = !.MI ^ checking_extra_goals := Checking
+		!:MI = !.MI ^ mode_sub_info ^ checking_extra_goals := Checking
 	).
 
 %-----------------------------------------------------------------------------%
Index: compiler/options.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/options.m,v
retrieving revision 1.445
diff -u -b -r1.445 options.m
--- compiler/options.m	22 Feb 2005 12:32:10 -0000	1.445
+++ compiler/options.m	23 Feb 2005 03:55:49 -0000
@@ -110,6 +110,8 @@
 		;	statistics
 		;	debug_types
 		;	debug_modes
+		;	debug_modes_verbose
+		;	debug_modes_pred_id
 		;	debug_det
 		;	debug_opt
 		;	debug_opt_pred_id
@@ -785,6 +787,8 @@
 	statistics		-	bool(no),
 	debug_types		- 	bool(no),
 	debug_modes		- 	bool(no),
+	debug_modes_verbose	- 	bool(no),
+	debug_modes_pred_id	- 	int(-1),
 	debug_det		- 	bool(no),
 	debug_opt		- 	bool(no),
 	debug_opt_pred_id	- 	int(-1),
@@ -1426,6 +1430,8 @@
 long_option("statistics",		statistics).
 long_option("debug-types",		debug_types).
 long_option("debug-modes",		debug_modes).
+long_option("debug-modes-verbose",	debug_modes_verbose).
+long_option("debug-modes-pred-id",	debug_modes_pred_id).
 long_option("debug-determinism",	debug_det).
 long_option("debug-det",		debug_det).
 long_option("debug-opt",		debug_opt).
@@ -2689,7 +2695,12 @@
 		"-T, --debug-types",
 		"\tOutput detailed debugging traces of the type checking.",
 		"-N, --debug-modes",
+		"\tOutput debugging traces of the mode checking.",
+		"--debug-modes-verbose",
 		"\tOutput detailed debugging traces of the mode checking.",
+		"--debug-modes-pred-id <n>",
+		"\tWith --debug-modes, restrict the debugging traces to the",
+		"\tmode checking of the predicate or function with the specified pred id.",
 		"--debug-det, --debug-determinism",
 		"\tOutput detailed debugging traces of determinism analysis.",
 		"--debug-opt",
cvs diff: Diffing compiler/notes
cvs diff: Diffing debian
cvs diff: Diffing deep_profiler
cvs diff: Diffing deep_profiler/notes
cvs diff: Diffing doc
Index: doc/user_guide.texi
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/doc/user_guide.texi,v
retrieving revision 1.421
diff -u -b -r1.421 user_guide.texi
--- doc/user_guide.texi	18 Feb 2005 04:05:33 -0000	1.421
+++ doc/user_guide.texi	23 Feb 2005 03:52:18 -0000
@@ -5137,7 +5137,18 @@
 @itemx --debug-modes
 @findex -N
 @findex --debug-modes
+Output debugging traces of the mode checking.
+
+ at sp 1
+ at item --debug-modes-verbose
+ at findex --debug-modes-verbose
 Output detailed debugging traces of the mode checking.
+
+ at sp 1
+ at item --debug-modes-pred-id @var{predid}
+ at findex --debug-modes-pred-id
+With @samp{--debug-modes}, restrict the debugging traces
+to the mode checking of the predicate or function with the specified pred id.
 
 @sp 1
 @item --debug-det
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