postproc: Add an option_map parameter

* src/tgbaalgos/postproc.cc: Add an option_map parameter, and use to get
extra options to pass to the degeneralization algorithm.
* src/tgbaalgos/postproc.hh: Adjust prototype, and store Boolean
variables for degeneralize() options.
* src/bin/ltl2tgba.cc: Add a -x option to fill the option map, and pass
it to the postprocessor.
* src/bin/man/ltl2tgba.x: Document the three degeneralization options.

src/bin/ltl2tgba.cc

@@ -1,6 +1,6 @@
 // -*- coding: utf-8 -*-
-// Copyright (C) 2012 Laboratoire de Recherche et Développement de
-// l'Epita (LRDE).
+// Copyright (C) 2012, 2013 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -39,6 +39,7 @@
 #include "tgbaalgos/save.hh"
 #include "tgbaalgos/stats.hh"
 #include "tgba/bddprint.hh"
+#include "misc/optionmap.hh"
 
 const char argp_program_doc[] ="\
 Translate linear-time formulas (LTL/PSL) into Büchi automata.\n\n\
@@ -91,6 +92,8 @@ static const argp_option options[] =
       "a single %", 0 },
     /**************************************************/
     { 0, 0, 0, 0, "Miscellaneous options:", -1 },
+    { "extra-options", 'x', "OPTS", 0,
+      "fine-tuning options (see man page)", 0 },
     { 0, 0, 0, 0, 0, 0 }
   };
 
@@ -105,6 +108,7 @@ const struct argp_child children[] =
 enum output_format { Dot, Lbtt, Spin, Spot, Stats } format = Dot;
 bool utf8 = false;
 const char* stats = "";
+spot::option_map extra_options;
 
 static int
 parse_opt(int key, char* arg, struct argp_state*)
@@ -126,6 +130,13 @@ parse_opt(int key, char* arg, struct argp_state*)
       if (type != spot::postprocessor::Monitor)
 	type = spot::postprocessor::BA;
       break;
+    case 'x':
+      {
+	const char* opt = extra_options.parse_options(arg);
+	if (opt)
+	  error(2, 0, "failed to parse --options near '%s'", opt);
+      }
+      break;
     case OPT_DOT:
       format = Dot;
       break;
@@ -258,7 +269,7 @@ main(int argc, char** argv)
 
   spot::ltl::ltl_simplifier simpl(simplifier_options());
 
-  spot::postprocessor postproc;
+  spot::postprocessor postproc(&extra_options);
   postproc.set_pref(pref);
   postproc.set_type(type);
   postproc.set_level(level);

src/bin/man/ltl2tgba.x

@@ -2,3 +2,27 @@
 ltl2tgba \- translate LTL/PSL formulas into Büchi automata
 [DESCRIPTION]
 .\" Add any additional description here
+[FINE-TUNING OPTIONS]
+
+The \fB\-\-extra\-options\fR argument is a comma-separated list of
+\fIKEY\fR=\fIINT\fR assignments that are passed to the post-processing
+routines (they may be passed to other algorithms in the future).
+These options are mostly used for benchmarking and debugging
+purpose.  \fIKEY\fR (without any value) is a
+shorthand for \fIKEY\fR=1, and !\fIKEY\fR is a shorthand for
+\fIKEY\fR=0.
+
+Supported options are:
+.TP
+\fBdegen\-reset\fR
+If non-zero (the default), the degeneralization algorithm will reset
+its level any time it exits a non-accepting SCC.
+.TP
+\fBdegen\-lcache\fR
+If non-zero (the default), whenever the degeneralization algorithm enters
+an SCC on a state that has already been associated to a level elsewhere,
+it should reuse that level.  The "lcache" stands for "level cache".
+.TP
+\fBdegen\-order\fR
+If non-zero, the degeneralization algorithm will compute one degeneralization
+order for each SCC it processes.  This is currently disabled by default.

src/tgbaalgos/postproc.cc

@@ -24,6 +24,8 @@
 #include "degen.hh"
 #include "stats.hh"
 #include "stripacc.hh"
+#include <cstdlib>
+#include "misc/optionmap.hh"
 
 namespace spot
 {
@@ -41,6 +43,18 @@ namespace spot
     return st.states;
   }
 
+  postprocessor::postprocessor(const option_map* opt)
+    : type_(TGBA), pref_(Small), level_(High),
+      degen_reset(true), degen_order(false), degen_cache(true)
+  {
+    if (opt)
+      {
+	degen_order = opt->get("degen-order", 0);
+	degen_reset = opt->get("degen-reset", 1);
+	degen_cache = opt->get("degen-lcache", 1);
+      }
+  }
+
   const tgba* postprocessor::run(const tgba* a, const ltl::formula* f)
   {
     if (type_ == TGBA && pref_ == Any && level_ == Low)
@@ -100,7 +114,10 @@ namespace spot
       {
 	if (type_ == BA)
 	  {
-	    const tgba* d = degeneralize(a);
+	    const tgba* d = degeneralize(a,
+					 degen_reset,
+					 degen_order,
+					 degen_cache);
 	    delete a;
 	    a = d;
 	  }
@@ -133,7 +150,10 @@ namespace spot
 	// Degeneralize the result of the simulation if needed.
 	if (type_ == BA)
 	  {
-	    const tgba* d = degeneralize(sim);
+	    const tgba* d = degeneralize(sim,
+					 degen_reset,
+					 degen_order,
+					 degen_cache);
 	    delete sim;
 	    sim = d;
 	  }

src/tgbaalgos/postproc.hh

@@ -24,6 +24,8 @@
 
 namespace spot
 {
+  class option_map;
+
   /// \addtogroup tgba_reduction
   /// @{
 
@@ -45,9 +47,9 @@ namespace spot
   /// deterministic automata or small automata.  If you don't care,
   /// less post processing will be done.
   ///
-  /// The set_level() method let you set the optimization level.
-  /// Higher level enable more costly postprocessign.  For instance
-  /// pref=Small,level=High will try two different postprocessings
+  /// The set_level() method lets you set the optimization level.
+  /// A higher level enables more costly post-processings.  For instance
+  /// pref=Small,level=High will try two different post-processings
   /// (one with minimize_obligation(), and one with
   /// iterated_simulations()) an keep the smallest result.
   /// pref=Small,level=Medium will only try the iterated_simulations()
@@ -57,10 +59,11 @@ namespace spot
   class postprocessor
   {
   public:
-    postprocessor()
-      : type_(TGBA), pref_(Small), level_(High)
-    {
-    }
+    /// \brief Construct a postprocessor.
+    ///
+    /// The \a opt argument can be used to pass extra fine-tuning
+    /// options used for debugging or benchmarking.
+    postprocessor(const option_map* opt = 0);
 
     enum output_type { TGBA, BA, Monitor };
     void
@@ -76,7 +79,6 @@ namespace spot
       pref_ = pref;
     }
 
-
     enum optimization_level { Low, Medium, High };
     void
     set_level(optimization_level level)
@@ -91,6 +93,10 @@ namespace spot
     output_type type_;
     output_pref pref_;
     optimization_level level_;
+    // Fine-tuning degeneralization options.
+    bool degen_reset;
+    bool degen_order;
+    bool degen_cache;
   };
   /// @}
 }