maint: run "make update-copyright"

[bison.git] / src / state.c

diff --git a/src/state.c b/src/state.c
index bae3575e4881e3705c734ceb5fc6385fdb721f43..b2eef95ef4d6498d01488fee8569b52712199def 100644 (file)
--- a/src/state.c
+++ b/src/state.c
@@ -1,24 +1,22 @@
 /* Type definitions for nondeterministic finite state machine for Bison.
 
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Free Software
-   Foundation, Inc.
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009 Free
+   Software Foundation, Inc.
 
    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
-   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
-   along with Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 #include "system.h"
@@ -28,6 +26,7 @@
 #include "complain.h"
 #include "gram.h"
 #include "state.h"
+#include "print-xml.h"
 
 
                        /*-------------------.
@@ -145,7 +144,7 @@ state_new (symbol_number accessing_symbol,
   res->errs = NULL;
   res->consistent = 0;
   res->solved_conflicts = NULL;
-  res->reachable = false;
+  res->solved_conflicts_xml = NULL;
 
   res->nitems = nitems;
   memcpy (res->items, core, items_size);
@@ -247,6 +246,29 @@ state_rule_lookahead_tokens_print (state *s, rule *r, FILE *out)
     }
 }
 
+void
+state_rule_lookahead_tokens_print_xml (state *s, rule *r,
+                                      FILE *out, int level)
+{
+  /* Find the reduction we are handling.  */
+  reductions *reds = s->reductions;
+  int red = state_reduction_find (s, r);
+
+  /* Print them if there are.  */
+  if (reds->lookahead_tokens && red != -1)
+    {
+      bitset_iterator biter;
+      int k;
+      xml_puts (out, level, "<lookaheads>");
+      BITSET_FOR_EACH (biter, reds->lookahead_tokens[red], k, 0)
+       {
+         xml_printf (out, level + 1, "<symbol>%s</symbol>",
+                     xml_escape (symbols[k]->tag));
+       }
+      xml_puts (out, level, "</lookaheads>");
+    }
+}
+
 
 /*---------------------.
 | A state hash table.  |
@@ -330,7 +352,8 @@ state_hash_free (void)
 void
 state_hash_insert (state *s)
 {
-  hash_insert (state_table, s);
+  if (!hash_insert (state_table, s))
+    xalloc_die ();
 }
 
 
@@ -354,41 +377,49 @@ state_hash_lookup (size_t nitems, item_number *core)
 }
 
 
-/*------------------------------------------------------.
-| Mark S and all states reachable from S as reachable.  |
-`------------------------------------------------------*/
+/*--------------------------------------------------------.
+| Record S and all states reachable from S in REACHABLE.  |
+`--------------------------------------------------------*/
 
 static void
-state_mark_reachable_states (state *s)
+state_record_reachable_states (state *s, bitset reachable)
 {
-  if (s->reachable)
+  if (bitset_test (reachable, s->number))
     return;
-  s->reachable = true;
-  for (int i = 0; i < s->transitions->num; ++i)
-    if (!TRANSITION_IS_DISABLED (s->transitions, i))
-      state_mark_reachable_states (s->transitions->states[i]);
+  bitset_set (reachable, s->number);
+  {
+    int i;
+    for (i = 0; i < s->transitions->num; ++i)
+      if (!TRANSITION_IS_DISABLED (s->transitions, i))
+        state_record_reachable_states (s->transitions->states[i], reachable);
+  }
 }
 
 void
 state_remove_unreachable_states (state_number old_to_new[])
 {
   state_number nstates_reachable = 0;
-  state_mark_reachable_states (states[0]);
-  for (state_number i = 0; i < nstates; ++i)
-    {
-      if (states[i]->reachable)
-        {
-          states[nstates_reachable] = states[i];
-          states[nstates_reachable]->number = nstates_reachable;
-          old_to_new[i] = nstates_reachable++;
-        }
-      else
-        {
-          state_free (states[i]);
-          old_to_new[i] = nstates;
-        }
-    }
+  bitset reachable = bitset_create (nstates, BITSET_FIXED);
+  state_record_reachable_states (states[0], reachable);
+  {
+    state_number i;
+    for (i = 0; i < nstates; ++i)
+      {
+        if (bitset_test (reachable, states[i]->number))
+          {
+            states[nstates_reachable] = states[i];
+            states[nstates_reachable]->number = nstates_reachable;
+            old_to_new[i] = nstates_reachable++;
+          }
+        else
+          {
+            state_free (states[i]);
+            old_to_new[i] = nstates;
+          }
+      }
+  }
   nstates = nstates_reachable;
+  bitset_free (reachable);
 }
 
 /* All the decorated states, indexed by the state number.  */