Avoid empty-if warnings.

[bison.git] / src / print_graph.c

diff --git a/src/print_graph.c b/src/print_graph.c
index a00434db52c4b092062c2fbd369135cbade59256..9d7da18a173728f80c335df0a88c2f70673f3da4 100644 (file)
--- a/src/print_graph.c
+++ b/src/print_graph.c
@@ -1,295 +1,185 @@
-/* Output a VCG description on generated parser, for Bison,
-   Copyright 2001 Free Software Foundation, Inc.
+/* Output a graph of the generated parser, for Bison.
+
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
+   Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 

-   Bison is free software; you can redistribute it and/or modify
+   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
    it under the terms of the GNU General Public License as published by

-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.

 
 

-   Bison is distributed in the hope that it will be useful,
+   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 General Public License
    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 General Public License

-   along with Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 

+#include <config.h>

 #include "system.h"
 #include "system.h"

-#include "files.h"
-#include "gram.h"
+
+#include <quotearg.h>
+

 #include "LR0.h"
 #include "LR0.h"

-#include "lalr.h"
-#include "conflicts.h"
+#include "closure.h"

 #include "complain.h"
 #include "complain.h"

+#include "conflicts.h"
+#include "files.h"

 #include "getargs.h"
 #include "getargs.h"

-#include "state.h"
-#include "reader.h"
-#include "obstack.h"
+#include "gram.h"
+#include "graphviz.h"
+#include "lalr.h"

 #include "print_graph.h"
 #include "print_graph.h"

-#include "vcg.h"
-#include "quotearg.h"
+#include "reader.h"
+#include "state.h"
+#include "symtab.h"

 
 

-static graph_t graph;
-static FILE *fgraph = NULL;

 
 

-static size_t node_output_size = 0;
+/*----------------------------.
+| Construct the node labels.  |
+`----------------------------*/

 
 

-/* Return an unambiguous printable representated, allocated in slot 0,
-   for NAME, suitable for C strings.  */
-static char const *
-quote (char const *name)
-{
-  return quotearg_n_style (0, escape_quoting_style, name);
-}
-
-/* This part will construct the label of nodes. */

 static void
 static void

-print_core (int state, struct obstack *node_obstack)
+print_core (struct obstack *oout, state *s)

 {
 {

-  int i;
-  int k;
-  int rule;
-  core *statep;
-  short *sp;
-  short *sp1;
-
-  statep = state_table[state];
-  k = statep->nitems;
+  size_t i;
+  item_number *sitems = s->items;
+  size_t snritems = s->nitems;

 
 

-  if (k == 0)
-    return;
+  /* Output all the items of a state, not only its kernel.  */
+  if (report_flag & report_itemsets)
+    {
+      closure (sitems, snritems);
+      sitems = itemset;
+      snritems = nitemset;
+    }

 
 

-  for (i = 0; i < k; i++)
+  obstack_fgrow1 (oout, "%d", s->number);
+  for (i = 0; i < snritems; i++)

     {
     {

-      if (i)
-       obstack_sgrow (node_obstack, "\\n");
+      item_number *sp;
+      item_number *sp1;
+      rule_number r;

 
 

-      sp1 = sp = ritem + statep->items[i];
+      sp1 = sp = ritem + sitems[i];

 
 

-      while (*sp > 0)
+      while (*sp >= 0)

        sp++;
 
        sp++;
 

-      rule = -(*sp);
+      r = item_number_as_rule_number (*sp);
+
+      obstack_fgrow1 (oout, "\n%s -> ", rules[r].lhs->tag);

 
 

-      obstack_fgrow1 (node_obstack, "%d: ", rule);
-      obstack_fgrow1 (node_obstack, " %s  ->  ", quote (tags[rlhs[rule]]));
+      for (sp = rules[r].rhs; sp < sp1; sp++)
+       obstack_fgrow1 (oout, "%s ", symbols[*sp]->tag);

 
 

-      for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
-       obstack_fgrow1 (node_obstack, "%s ", quote (tags[*sp]));
+      obstack_1grow (oout, '.');

 
 

-      obstack_1grow (node_obstack, '.');
+      for (/* Nothing */; *sp >= 0; ++sp)
+       obstack_fgrow1 (oout, " %s", symbols[*sp]->tag);

 
 

-      while (*sp > 0)
-       obstack_fgrow1 (node_obstack, " %s", quote (tags[*sp++]));
+      /* Experimental feature: display the lookahead tokens. */
+      if (report_flag & report_lookahead_tokens
+          && item_number_is_rule_number (*sp1))
+       {
+         /* Find the reduction we are handling.  */
+         reductions *reds = s->reductions;
+         int redno = state_reduction_find (s, &rules[r]);
+
+         /* Print them if there are.  */
+         if (reds->lookahead_tokens && redno != -1)
+           {
+             bitset_iterator biter;
+             int k;
+             char const *sep = "";
+             obstack_sgrow (oout, "[");
+             BITSET_FOR_EACH (biter, reds->lookahead_tokens[redno], k, 0)
+               {
+                 obstack_fgrow2 (oout, "%s%s", sep, symbols[k]->tag);
+                 sep = ", ";
+               }
+             obstack_sgrow (oout, "]");
+           }
+       }

     }
 }
 
     }
 }
 

-/* Output in graph_obstack edges specifications in incidence with current 
-   node.  */
+
+/*---------------------------------------------------------------.
+| Output in graph_obstack edges specifications in incidence with |
+| current node.                                                  |
+`---------------------------------------------------------------*/
+

 static void
 static void

-print_actions (int state, const char *node_name, struct obstack *node_obstack)
+print_actions (state const *s, FILE *fgraph)

 {
   int i;
 {
   int i;

-  int k;
-  int state1;
-  int symbol;
-  shifts *shiftp;
-  errs *errp;
-  reductions *redp;
-  int rule;
-  static char buff[10];
-  edge_t edge;
-
-  shiftp = shift_table[state];
-  redp = reduction_table[state];
-  errp = err_table[state];
-
-  if (!shiftp && !redp)
-    {
-      if (final_state == state)
-       obstack_sgrow (node_obstack, "$default: accept");
-      else
-       obstack_sgrow (node_obstack, "NO ACTIONS");
-      return;
-    }
-
-  if (shiftp)
-    {
-      k = shiftp->nshifts;

 
 

-      for (i = 0; i < k; i++)
-       {
-         if (!shiftp->shifts[i])
-           continue;
-         state1 = shiftp->shifts[i];
-         symbol = accessing_symbol[state1];
-
-         if (ISVAR (symbol))
-           break;
-
-         {
-           new_edge (&edge);
-
-           if (state > state1)
-             edge.type = back_edge;
-           open_edge (&edge, fgraph);
-           /* The edge source is the current node.  */
-           edge.sourcename = node_name;
-           sprintf (buff, "%d", state1);
-           edge.targetname = buff;
-           edge.color = (symbol == 0) ? red : blue;
-           /* FIXME: Be aware that quote uses static memory.  The string
-              must be output immediately (which is the case here). */
-           edge.label = tags[symbol] ? quote (tags[symbol]) : NULL;
-           output_edge (&edge, fgraph);
-           close_edge (fgraph);
-         }
-       }
-    }
-  else
-    {
-      i = 0;
-      k = 0;
-    }
+  transitions const *trans = s->transitions;

 
 

-  if (errp)
-    {
-      int j, nerrs;
+  if (!trans->num && !s->reductions)
+    return;

 
 

-      nerrs = errp->nerrs;
+  for (i = 0; i < trans->num; i++)
+    if (!TRANSITION_IS_DISABLED (trans, i))
+      {
+       state *s1 = trans->states[i];
+       symbol_number sym = s1->accessing_symbol;
+
+       /* Shifts are solid, gotos are dashed, and error is dotted.  */
+       char const *style =
+         (TRANSITION_IS_ERROR (trans, i) ? "dotted"
+          : TRANSITION_IS_SHIFT (trans, i) ? "solid"
+          : "dashed");
+
+       if (TRANSITION_IS_ERROR (trans, i)
+           && strcmp (symbols[sym]->tag, "error") != 0)
+         abort ();
+       output_edge (s->number, s1->number,
+                    TRANSITION_IS_ERROR (trans, i) ? NULL : symbols[sym]->tag,
+                    style, fgraph);
+      }
+}

 
 

-      for (j = 0; j < nerrs; j++)
-       {
-         if (!errp->errs[j])
-           continue;
-         symbol = errp->errs[j];
-         /* If something has been added in the NODE_OBSTACK after
-            the declaration of the label, then we need a `\n'.  */
-         if (obstack_object_size (node_obstack) > node_output_size)
-           obstack_sgrow (node_obstack, "\\n");
-         obstack_fgrow1 (node_obstack, _("%-4s\terror (nonassociative)"),
-                         tags[symbol]);
-       }
-      if (j > 0)
-       obstack_sgrow (node_obstack, "\\n");
-    }

 
 

-  if (consistent[state] && redp)
-    {
-      rule = redp->rules[0];
-      symbol = rlhs[rule];
-      if (obstack_object_size (node_obstack) > node_output_size)
-       obstack_sgrow (node_obstack, "\\n");
-      obstack_fgrow2 (node_obstack, _("$default\treduce using rule %d (%s)"),
-                     rule, tags[symbol]);
-    }
+/*-------------------------------------------------------------.
+| Output in FGRAPH the current node specifications and exiting |
+| edges.                                                       |
+`-------------------------------------------------------------*/

 
 

-  if (i < k)
-    {
-      for (; i < k; i++)
-       {
-         if (!shiftp->shifts[i])
-           continue;
-         state1 = shiftp->shifts[i];
-         symbol = accessing_symbol[state1];
-
-         new_edge (&edge);
-         open_edge (&edge, fgraph);
-         edge.sourcename = node_name;
-         sprintf (buff, "%d", state1);
-         edge.targetname = buff;
-         edge.color = red;
-         edge.label = tags[symbol] ? quote (tags[symbol]) : NULL;
-         output_edge (&edge, fgraph);
-         close_edge (fgraph);
-       }
-    }
-}
-
-/* Output in GRAPH_OBSTACK the current node specifications and edges 
-   which go out from that node.  */

 static void
 static void

-print_state (int state)
+print_state (state *s, FILE *fgraph)

 {
 {

-  static char name[10];

   struct obstack node_obstack;
   struct obstack node_obstack;

-  node_t node;

 
 

+  /* A node's label contains its items.  */

   obstack_init (&node_obstack);
   obstack_init (&node_obstack);

-  new_node (&node);    /* Set node attributs default value.  */
-  sprintf (name, "%d", state);
-  node.title = name;   /* Give a name to the node.  */
-  
-  { 
-    /* Here we begin to compute the node label. */  
-    obstack_sgrow (&node_obstack, "\t\tlabel:\t\"");   /* Open Label  */
-    
-    /* Keep the size of NODE_OBSTACK before computing the label. It is 
-       useful to format the label.  */
-    node_output_size = obstack_object_size (&node_obstack);
-    
-    /* Compute the labels of nodes on the fly.  */
-    print_core (state, &node_obstack);
-    /* Compute edges and additionnal parts of node label.  */
-    print_actions (state, node.title, &node_obstack);
-    
-    obstack_sgrow (&node_obstack, "\"\n");             /* Close Label.  */
-  }    
-
-  open_node (fgraph);
-  /* Output a VCG formatted attributs list.  */
-  output_node (&node, fgraph);
-  /* Save the node label.  */
-  fwrite (obstack_base (&node_obstack), 
-         obstack_object_size (&node_obstack), 1, fgraph);
-  close_node (fgraph);
-
+  print_core (&node_obstack, s);
+  obstack_1grow (&node_obstack, '\0');
+  output_node (s->number, obstack_finish (&node_obstack), fgraph);

   obstack_free (&node_obstack, 0);
   obstack_free (&node_obstack, 0);

+
+  /* Output the edges.  */
+  print_actions (s, fgraph);

 }
 \f
 
 void
 print_graph (void)
 {
 }
 \f
 
 void
 print_graph (void)
 {

-  int i;
-  
-  if (!graph_flag)
-    return;
-
-  /* Output file.  */
-  fgraph = xfopen (spec_graph_file, "w");
-
-  new_graph (&graph);
-
-#if 0
-  graph.smanhattan_edges = yes;
-  graph.manhattan_edges = yes; 
-#endif
-
-  graph.display_edge_labels = yes;
-  graph.layoutalgorithm = normal;
-
-  graph.port_sharing = no;
-  graph.finetuning = yes;
-  graph.straight_phase = yes;
-  graph.priority_phase = yes;
-  graph.splines = yes;
-
-  graph.crossing_weight = median;
-
-  /* Output graph options. */
-  open_graph (fgraph);
-  output_graph (&graph, fgraph);
+  state_number i;
+  FILE *fgraph = xfopen (spec_graph_file, "w");
+  start_graph (fgraph);

 
 

+  /* Output nodes and edges. */
+  new_closure (nritems);

   for (i = 0; i < nstates; i++)
   for (i = 0; i < nstates; i++)

-    /* Output nodes & edges. */
-    print_state (i);
+    print_state (states[i], fgraph);
+  free_closure ();

 
 

-  /* Close graph. */
-  close_graph (&graph, fgraph);
+  finish_graph (fgraph);

   xfclose (fgraph);
 }
   xfclose (fgraph);
 }