X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/9703cc49e0f3518e136b435b6cbcae3263eb7b7a..78a00b7d7fad9a7b81cdf3d9cba4ca896a873502:/src/print_graph.c

diff --git a/src/print_graph.c b/src/print_graph.c
index a99af9c9..c92ae357 100644
--- a/src/print_graph.c
+++ b/src/print_graph.c
@@ -1,5 +1,6 @@
 /* Output a VCG description on generated parser, for Bison,
-   Copyright 2001 Free Software Foundation, Inc.
+
+   Copyright (C) 2001, 2002 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -19,235 +20,173 @@
    Boston, MA 02111-1307, USA.  */
 
 #include "system.h"
-#include "files.h"
-#include "gram.h"
+
+#include <obstack.h>
+#include <quotearg.h>
+
 #include "LR0.h"
-#include "lalr.h"
-#include "conflicts.h"
+#include "closure.h"
 #include "complain.h"
+#include "conflicts.h"
+#include "files.h"
 #include "getargs.h"
-#include "state.h"
-#include "reader.h"
-#include "obstack.h"
+#include "gram.h"
+#include "lalr.h"
 #include "print_graph.h"
+#include "reader.h"
+#include "state.h"
+#include "symtab.h"
 #include "vcg.h"
-#include "quotearg.h"
 
-static graph_t graph;
+static graph static_graph;
 static FILE *fgraph = NULL;
 
-static size_t node_output_size = 0;
 
-/* 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);
-}
+/*----------------------------.
+| Construct the node labels.  |
+`----------------------------*/
 
-/* This part will construct the label of nodes. */
 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].state;
-  k = statep->nitems;
+  item_number *sitems = s->items;
+  int 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 = nritemset;
+    }
 
-  for (i = 0; i < k; i++)
+  obstack_fgrow1 (oout, "state %2d\n", 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++;
 
-      rule = -(*sp);
+      r = item_number_as_rule_number (*sp);
+
+      if (i)
+	obstack_1grow (oout, '\n');
+      obstack_fgrow1 (oout, " %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 lookaheads. */
+      if (report_flag & report_lookaheads)
+	{
+	  /* 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->lookaheads && redno != -1)
+	    {
+	      bitset_iterator biter;
+	      int k;
+	      int not_first = 0;
+	      obstack_sgrow (oout, "[");
+	      BITSET_FOR_EACH (biter, reds->lookaheads[redno], k, 0)
+		obstack_fgrow2 (oout, "%s%s",
+				not_first++ ? ", " : "",
+				symbols[k]->tag);
+	      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
-print_actions (int state, const char *node_name, struct obstack *node_obstack)
+print_actions (state *s, const char *node_name)
 {
   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;
+  transitions *trans = s->transitions;
+  reductions *reds = s->reductions;
 
-      for (i = 0; i < k; i++)
-	{
-	  if (!shiftp->shifts[i])
-	    continue;
-	  state1 = shiftp->shifts[i];
-	  symbol = state_table[state1].accessing_symbol;
-
-	  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;
-    }
+  static char buff[10];
+  edge e;
 
-  if (errp)
-    {
-      int j, nerrs;
+  if (!trans->num && !reds)
+    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;
+
+	new_edge (&e);
+
+	if (s->number > s1->number)
+	  e.type = back_edge;
+	open_edge (&e, fgraph);
+	/* The edge source is the current node.  */
+	e.sourcename = node_name;
+	sprintf (buff, "%d", s1->number);
+	e.targetname = buff;
+	/* Shifts are blue, gotos are green, and error is red. */
+	if (TRANSITION_IS_ERROR (trans, i))
+	  e.color = red;
+	else
+	  e.color = TRANSITION_IS_SHIFT (trans, i) ? blue : green;
+	e.label = symbols[sym]->tag;
+	output_edge (&e, fgraph);
+	close_edge (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]);
-    }
-
-  if (i < k)
-    {
-      for (; i < k; i++)
-	{
-	  if (!shiftp->shifts[i])
-	    continue;
-	  state1 = shiftp->shifts[i];
-	  symbol = state_table[state1].accessing_symbol;
-
-	  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 FGRAPH the current node specifications and exiting |
+| edges.                                                       |
+`-------------------------------------------------------------*/
 
-/* Output in GRAPH_OBSTACK the current node specifications and edges
-   which go out from that node.  */
 static void
-print_state (int state)
+print_state (state *s)
 {
   static char name[10];
   struct obstack node_obstack;
-  node_t node;
+  node n;
 
+  /* The labels of the nodes are their the items.  */
   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.  */
-  }
+  new_node (&n);
+  sprintf (name, "%d", s->number);
+  n.title = name;
+  print_core (&node_obstack, s);
+  obstack_1grow (&node_obstack, '\0');
+  n.label = obstack_finish (&node_obstack);
 
   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);
+  output_node (&n, fgraph);
   close_node (fgraph);
 
+  /* Output the edges.  */
+  print_actions (s, name);
+
   obstack_free (&node_obstack, 0);
 }
 
@@ -255,41 +194,40 @@ print_state (int state)
 void
 print_graph (void)
 {
-  int i;
-
-  if (!graph_flag)
-    return;
+  state_number i;
 
   /* Output file.  */
   fgraph = xfopen (spec_graph_file, "w");
 
-  new_graph (&graph);
+  new_graph (&static_graph);
 
 #if 0
-  graph.smanhattan_edges = yes;
-  graph.manhattan_edges = yes;
+  static_graph.smanhattan_edges = yes;
+  static_graph.manhattan_edges = yes;
 #endif
 
-  graph.display_edge_labels = yes;
-  graph.layoutalgorithm = normal;
+  static_graph.display_edge_labels = yes;
+  static_graph.layoutalgorithm = normal;
 
-  graph.port_sharing = no;
-  graph.finetuning = yes;
-  graph.straight_phase = yes;
-  graph.priority_phase = yes;
-  graph.splines = yes;
+  static_graph.port_sharing = no;
+  static_graph.finetuning = yes;
+  static_graph.long_straight_phase = yes;
+  static_graph.priority_phase = yes;
+  static_graph.splines = yes;
 
-  graph.crossing_weight = median;
+  static_graph.crossing_weight = median;
 
   /* Output graph options. */
   open_graph (fgraph);
-  output_graph (&graph, fgraph);
+  output_graph (&static_graph, fgraph);
 
+  /* Output nodes and edges. */
+  new_closure (nritems);
   for (i = 0; i < nstates; i++)
-    /* Output nodes & edges. */
-    print_state (i);
+    print_state (states[i]);
+  free_closure ();
 
   /* Close graph. */
-  close_graph (&graph, fgraph);
+  close_graph (&static_graph, fgraph);
   xfclose (fgraph);
 }