src/print_graph.c

   1 /* Output a VCG description on generated parser, for Bison,
   2    Copyright 2001 Free Software Foundation, Inc.
   3
   4    This file is part of Bison, the GNU Compiler Compiler.
   5
   6    Bison is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    Bison is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with Bison; see the file COPYING.  If not, write to
  18    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "system.h"
  22 #include "quotearg.h"
  23 #include "files.h"
  24 #include "symtab.h"
  25 #include "gram.h"
  26 #include "LR0.h"
  27 #include "lalr.h"
  28 #include "conflicts.h"
  29 #include "complain.h"
  30 #include "getargs.h"
  31 #include "state.h"
  32 #include "reader.h"
  33 #include "closure.h"
  34 #include "obstack.h"
  35 #include "print_graph.h"
  36 #include "vcg.h"
  37
  38 static graph_t graph;
  39 static FILE *fgraph = NULL;
  40
  41 static inline const char *
  42 escape (const char *s)
  43 {
  44   return quotearg_n_style (1, escape_quoting_style, s);
  45 }
  46
  47
  48 /* This part will construct the label of nodes. */
  49 static void
  50 print_core (state_t *state, struct obstack *node_obstack)
  51 {
  52   int i;
  53   short *sitems = state->items;
  54   int snitems   = state->nitems;
  55
  56   /* Output all the items of a state, not only its kernel.  */
  57   if (trace_flag)
  58     {
  59       closure (sitems, snitems);
  60       sitems = itemset;
  61       snitems = nitemset;
  62     }
  63
  64   obstack_fgrow1 (node_obstack, "state %2d\n", state->number);
  65   for (i = 0; i < snitems; i++)
  66     {
  67       short *sp;
  68       short *sp1;
  69       int rule;
  70
  71       sp1 = sp = ritem + sitems[i];
  72
  73       while (*sp >= 0)
  74         sp++;
  75
  76       rule = -(*sp);
  77
  78       if (i)
  79         obstack_1grow (node_obstack, '\n');
  80       obstack_fgrow1 (node_obstack, " %s -> ",
  81                       escape (symbols[rules[rule].lhs]->tag));
  82
  83       for (sp = ritem + rules[rule].rhs; sp < sp1; sp++)
  84         obstack_fgrow1 (node_obstack, "%s ", escape (symbols[*sp]->tag));
  85
  86       obstack_1grow (node_obstack, '.');
  87
  88       for (/* Nothing */; *sp >= 0; ++sp)
  89         obstack_fgrow1 (node_obstack, " %s", escape (symbols[*sp]->tag));
  90     }
  91 }
  92
  93
  94 /*---------------------------------------------------------------.
  95 | Output in graph_obstack edges specifications in incidence with |
  96 | current node.                                                  |
  97 `---------------------------------------------------------------*/
  98
  99 static void
 100 print_actions (state_t *state, const char *node_name)
 101 {
 102   int i;
 103
 104   shifts   *shiftp = state->shifts;
 105   reductions *redp = state->reductions;
 106
 107   static char buff[10];
 108   edge_t edge;
 109
 110   if (!shiftp->nshifts && !redp)
 111     return;
 112
 113   for (i = 0; i < shiftp->nshifts; i++)
 114     if (!SHIFT_IS_DISABLED (shiftp, i))
 115       {
 116         int state1 = shiftp->shifts[i];
 117         int symbol = states[state1]->accessing_symbol;
 118
 119         new_edge (&edge);
 120
 121         if (state->number > state1)
 122           edge.type = back_edge;
 123         open_edge (&edge, fgraph);
 124         /* The edge source is the current node.  */
 125         edge.sourcename = node_name;
 126         sprintf (buff, "%d", state1);
 127         edge.targetname = buff;
 128         /* Shifts are blue, gotos are green, and error is red. */
 129         if (SHIFT_IS_ERROR (shiftp, i))
 130           edge.color = red;
 131         else
 132           edge.color = SHIFT_IS_SHIFT(shiftp, i) ? blue : green;
 133         edge.label = escape (symbols[symbol]->tag);
 134         output_edge (&edge, fgraph);
 135         close_edge (fgraph);
 136       }
 137 }
 138
 139
 140 /*-------------------------------------------------------------.
 141 | Output in FGRAPH the current node specifications and exiting |
 142 | edges.                                                       |
 143 `-------------------------------------------------------------*/
 144
 145 static void
 146 print_state (state_t *state)
 147 {
 148   static char name[10];
 149   struct obstack node_obstack;
 150   node_t node;
 151
 152   /* The labels of the nodes are their the items.  */
 153   obstack_init (&node_obstack);
 154   new_node (&node);
 155   sprintf (name, "%d", state->number);
 156   node.title = name;
 157   print_core (state, &node_obstack);
 158   obstack_1grow (&node_obstack, '\0');
 159   node.label = obstack_finish (&node_obstack);
 160
 161   open_node (fgraph);
 162   output_node (&node, fgraph);
 163   close_node (fgraph);
 164
 165   /* Output the edges.  */
 166   print_actions (state, name);
 167
 168   obstack_free (&node_obstack, 0);
 169 }
 170 \f
 171
 172 void
 173 print_graph (void)
 174 {
 175   int i;
 176
 177   /* Output file.  */
 178   fgraph = xfopen (spec_graph_file, "w");
 179
 180   new_graph (&graph);
 181
 182 #if 0
 183   graph.smanhattan_edges = yes;
 184   graph.manhattan_edges = yes;
 185 #endif
 186
 187   graph.display_edge_labels = yes;
 188   graph.layoutalgorithm = normal;
 189
 190   graph.port_sharing = no;
 191   graph.finetuning = yes;
 192   graph.straight_phase = yes;
 193   graph.priority_phase = yes;
 194   graph.splines = yes;
 195
 196   graph.crossing_weight = median;
 197
 198   /* Output graph options. */
 199   open_graph (fgraph);
 200   output_graph (&graph, fgraph);
 201
 202   /* Output nodes and edges. */
 203   new_closure (nritems);
 204   for (i = 0; i < nstates; i++)
 205     print_state (states[i]);
 206   free_closure ();
 207
 208   /* Close graph. */
 209   close_graph (&graph, fgraph);
 210   xfclose (fgraph);
 211 }