* data/lalr1.cc: Use temporary variables instead of casts to

[bison.git] / src / LR0.c

diff --git a/src/LR0.c b/src/LR0.c
index a7a62e5921478a59858eeef62047f9abad25c77b..ae39b7ce5033433d5d5d9e8748540de4e1396a71 100644 (file)
--- a/src/LR0.c
+++ b/src/LR0.c
@@ -1,5 +1,7 @@
-/* Generate the nondeterministic finite state machine for bison,
-   Copyright 1984, 1986, 1989, 2000, 2001, 2002  Free Software Foundation, Inc.
+/* Generate the nondeterministic finite state machine for Bison.
+
+   Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002 Free Software
+   Foundation, Inc.

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


@@ -23,28 +25,30 @@
    The entry point is generate_states.  */
 
 #include "system.h"
    The entry point is generate_states.  */
 
 #include "system.h"

-#include "bitset.h"
-#include "quotearg.h"
-#include "symtab.h"
-#include "gram.h"
+
+#include <bitset.h>
+#include <quotearg.h>
+
+#include "LR0.h"
+#include "closure.h"
+#include "complain.h"

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

-#include "reader.h"

 #include "gram.h"
 #include "gram.h"

-#include "state.h"
-#include "complain.h"
-#include "closure.h"
-#include "LR0.h"
+#include "gram.h"

 #include "lalr.h"
 #include "lalr.h"

+#include "reader.h"

 #include "reduce.h"
 #include "reduce.h"

+#include "state.h"
+#include "symtab.h"

 
 

-typedef struct state_list_s
+typedef struct state_list

 {
 {

-  struct state_list_s *next;
-  state_t *state;
-} state_list_t;
+  struct state_list *next;
+  state *state;
+} state_list;

 
 

-static state_list_t *first_state = NULL;
-static state_list_t *last_state = NULL;
+static state_list *first_state = NULL;
+static state_list *last_state = NULL;

 
 
 /*------------------------------------------------------------------.
 
 
 /*------------------------------------------------------------------.


@@ -52,24 +56,23 @@ static state_list_t *last_state = NULL;
 | later examination, in order to find its transitions.  Return it.  |
 `------------------------------------------------------------------*/
 
 | later examination, in order to find its transitions.  Return it.  |
 `------------------------------------------------------------------*/
 

-static state_t *
-state_list_append (symbol_number_t symbol,
-                  size_t core_size, item_number_t *core)
+static state *
+state_list_append (symbol_number sym, size_t core_size, item_number *core)

 {
 {

-  state_list_t *node = XMALLOC (state_list_t, 1);
-  state_t *state = state_new (symbol, core_size, core);
+  state_list *node = MALLOC (node, 1);
+  state *s = state_new (sym, core_size, core);

 
 

-  if (trace_flag)
+  if (trace_flag & trace_automaton)

     fprintf (stderr, "state_list_append (state = %d, symbol = %d (%s))\n",
     fprintf (stderr, "state_list_append (state = %d, symbol = %d (%s))\n",

-            nstates, symbol, symbols[symbol]->tag);
+            nstates, sym, symbols[sym]->tag);

 
 

-  /* If this is the eoftoken, and this is not the initial state, then
+  /* If this is the endtoken, and this is not the initial state, then

      this is the final state.  */
      this is the final state.  */

-  if (symbol == 0 && first_state)
-    final_state = state;
+  if (sym == 0 && first_state)
+    final_state = s;

 
   node->next = NULL;
 
   node->next = NULL;

-  node->state = state;
+  node->state = s;

 
   if (!first_state)
     first_state = node;
 
   if (!first_state)
     first_state = node;


@@ -77,35 +80,35 @@ state_list_append (symbol_number_t symbol,
     last_state->next = node;
   last_state = node;
 
     last_state->next = node;
   last_state = node;
 

-  return state;
+  return s;

 }
 
 static int nshifts;
 }
 
 static int nshifts;

-static symbol_number_t *shift_symbol = NULL;
+static symbol_number *shift_symbol = NULL;

 
 

-static short *redset = NULL;
-static state_number_t *shiftset = NULL;
+static rule **redset = NULL;
+static state **shiftset = NULL;

 
 

-static item_number_t **kernel_base = NULL;
+static item_number **kernel_base = NULL;

 static int *kernel_size = NULL;
 static int *kernel_size = NULL;

-static item_number_t *kernel_items = NULL;
+static item_number *kernel_items = NULL;

 
 \f
 static void
 allocate_itemsets (void)
 {
 
 \f
 static void
 allocate_itemsets (void)
 {

-  symbol_number_t i;
-  rule_number_t r;
-  item_number_t *rhsp;
+  symbol_number i;
+  rule_number r;
+  item_number *rhsp;

 
   /* Count the number of occurrences of all the symbols in RITEMS.
      Note that useless productions (hence useless nonterminals) are
      browsed too, hence we need to allocate room for _all_ the
      symbols.  */
   int count = 0;
 
   /* Count the number of occurrences of all the symbols in RITEMS.
      Note that useless productions (hence useless nonterminals) are
      browsed too, hence we need to allocate room for _all_ the
      symbols.  */
   int count = 0;

-  short *symbol_count = XCALLOC (short, nsyms + nuseless_nonterminals);
+  short *symbol_count = CALLOC (symbol_count, nsyms + nuseless_nonterminals);

 
 

-  for (r = 1; r < nrules + 1; ++r)
+  for (r = 0; r < nrules; ++r)

     for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
       {
        count++;
     for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
       {
        count++;


@@ -114,13 +117,13 @@ allocate_itemsets (void)
 
   /* See comments before new_itemsets.  All the vectors of items
      live inside KERNEL_ITEMS.  The number of active items after
 
   /* See comments before new_itemsets.  All the vectors of items
      live inside KERNEL_ITEMS.  The number of active items after

-     some symbol cannot be more than the number of times that symbol
-     appears as an item, which is SYMBOL_COUNT[SYMBOL].
+     some symbol S cannot be more than the number of times that S
+     appears as an item, which is SYMBOL_COUNT[S].

      We allocate that much space for each symbol.  */
 
      We allocate that much space for each symbol.  */
 

-  kernel_base = XCALLOC (item_number_t *, nsyms);
+  CALLOC (kernel_base, nsyms);

   if (count)
   if (count)

-    kernel_items = XCALLOC (item_number_t, count);
+    CALLOC (kernel_items, count);

 
   count = 0;
   for (i = 0; i < nsyms; i++)
 
   count = 0;
   for (i = 0; i < nsyms; i++)


@@ -130,7 +133,7 @@ allocate_itemsets (void)
     }
 
   free (symbol_count);
     }
 
   free (symbol_count);

-  kernel_size = XCALLOC (int, nsyms);
+  CALLOC (kernel_size, nsyms);

 }
 
 
 }
 
 


@@ -139,10 +142,10 @@ allocate_storage (void)
 {
   allocate_itemsets ();
 
 {
   allocate_itemsets ();
 

-  shiftset = XCALLOC (state_number_t, nsyms);
-  redset = XCALLOC (short, nrules + 1);
+  CALLOC (shiftset, nsyms);
+  CALLOC (redset, nrules);

   state_hash_new ();
   state_hash_new ();

-  shift_symbol = XCALLOC (symbol_number_t, nsyms);
+  CALLOC (shift_symbol, nsyms);

 }
 
 
 }
 
 


@@ -162,7 +165,7 @@ free_storage (void)
 
 
 /*---------------------------------------------------------------.
 
 
 /*---------------------------------------------------------------.

-| Find which symbols can be shifted in STATE, and for each one   |
+| Find which symbols can be shifted in S, and for each one       |

 | record which items would be active after that shift.  Uses the |
 | contents of itemset.                                           |
 |                                                                |
 | record which items would be active after that shift.  Uses the |
 | contents of itemset.                                           |
 |                                                                |


@@ -173,13 +176,12 @@ free_storage (void)
 `---------------------------------------------------------------*/
 
 static void
 `---------------------------------------------------------------*/
 
 static void

-new_itemsets (state_t *state)
+new_itemsets (state *s)

 {
   int i;
 
 {
   int i;
 

-  if (trace_flag)
-    fprintf (stderr, "Entering new_itemsets, state = %d\n",
-            state->number);
+  if (trace_flag & trace_automaton)
+    fprintf (stderr, "Entering new_itemsets, state = %d\n", s->number);

 
   for (i = 0; i < nsyms; i++)
     kernel_size[i] = 0;
 
   for (i = 0; i < nsyms; i++)
     kernel_size[i] = 0;


@@ -189,83 +191,75 @@ new_itemsets (state_t *state)
   for (i = 0; i < nritemset; ++i)
     if (ritem[itemset[i]] >= 0)
       {
   for (i = 0; i < nritemset; ++i)
     if (ritem[itemset[i]] >= 0)
       {

-       symbol_number_t symbol
-         = item_number_as_symbol_number (ritem[itemset[i]]);
-       if (!kernel_size[symbol])
+       symbol_number sym = item_number_as_symbol_number (ritem[itemset[i]]);
+       if (!kernel_size[sym])

          {
          {

-           shift_symbol[nshifts] = symbol;
+           shift_symbol[nshifts] = sym;

            nshifts++;
          }
 
            nshifts++;
          }
 

-       kernel_base[symbol][kernel_size[symbol]] = itemset[i] + 1;
-       kernel_size[symbol]++;
+       kernel_base[sym][kernel_size[sym]] = itemset[i] + 1;
+       kernel_size[sym]++;

       }
 }
 
 
 
 /*--------------------------------------------------------------.
       }
 }
 
 
 
 /*--------------------------------------------------------------.

-| Find the state number for the state we would get to (from the |
-| current state) by shifting symbol.  Create a new state if no  |
-| equivalent one exists already.  Used by append_states.        |
+| Find the state we would get to (from the current state) by    |
+| shifting SYM.  Create a new state if no equivalent one exists |
+| already.  Used by append_states.                              |

 `--------------------------------------------------------------*/
 
 `--------------------------------------------------------------*/
 

-static state_number_t
-get_state (symbol_number_t symbol, size_t core_size, item_number_t *core)
+static state *
+get_state (symbol_number sym, size_t core_size, item_number *core)

 {
 {

-  state_t *sp;
+  state *sp;

 
 

-  if (trace_flag)
+  if (trace_flag & trace_automaton)

     fprintf (stderr, "Entering get_state, symbol = %d (%s)\n",
     fprintf (stderr, "Entering get_state, symbol = %d (%s)\n",

-            symbol, symbols[symbol]->tag);
+            sym, symbols[sym]->tag);

 
   sp = state_hash_lookup (core_size, core);
   if (!sp)
 
   sp = state_hash_lookup (core_size, core);
   if (!sp)

-    sp = state_list_append (symbol, core_size, core);
+    sp = state_list_append (sym, core_size, core);

 
 

-  if (trace_flag)
+  if (trace_flag & trace_automaton)

     fprintf (stderr, "Exiting get_state => %d\n", sp->number);
 
     fprintf (stderr, "Exiting get_state => %d\n", sp->number);
 

-  return sp->number;
+  return sp;

 }
 
 }
 

-/*------------------------------------------------------------------.
-| Use the information computed by new_itemsets to find the state    |
-| numbers reached by each shift transition from STATE.              |
-|                                                                   |
-| TRANSITIONSET is set up as a vector of state numbers of those states.  |
-`------------------------------------------------------------------*/
+/*---------------------------------------------------------------.
+| Use the information computed by new_itemsets to find the state |
+| numbers reached by each shift transition from S.              |
+|                                                                |
+| SHIFTSET is set up as a vector of those states.                |
+`---------------------------------------------------------------*/

 
 static void
 
 static void

-append_states (state_t *state)
+append_states (state *s)

 {
   int i;
 {
   int i;

-  int j;
-  symbol_number_t symbol;

 
 

-  if (trace_flag)
-    fprintf (stderr, "Entering append_states, state = %d\n",
-            state->number);
+  if (trace_flag & trace_automaton)
+    fprintf (stderr, "Entering append_states, state = %d\n", s->number);

 
 

-  /* first sort shift_symbol into increasing order */
+  /* First sort shift_symbol into increasing order.  */

 
   for (i = 1; i < nshifts; i++)
     {
 
   for (i = 1; i < nshifts; i++)
     {

-      symbol = shift_symbol[i];
-      j = i;
-      while (j > 0 && shift_symbol[j - 1] > symbol)
-       {
-         shift_symbol[j] = shift_symbol[j - 1];
-         j--;
-       }
-      shift_symbol[j] = symbol;
+      symbol_number sym = shift_symbol[i];
+      int j;
+      for (j = i; 0 < j && sym < shift_symbol [j - 1]; j--)
+       shift_symbol[j] = shift_symbol[j - 1];
+      shift_symbol[j] = sym;

     }
 
   for (i = 0; i < nshifts; i++)
     {
     }
 
   for (i = 0; i < nshifts; i++)
     {

-      symbol = shift_symbol[i];
-      shiftset[i] = get_state (symbol,
-                              kernel_size[symbol], kernel_base[symbol]);
+      symbol_number sym = shift_symbol[i];
+      shiftset[i] = get_state (sym, kernel_size[sym], kernel_base[sym]);

     }
 }
 
     }
 }
 


@@ -277,26 +271,21 @@ append_states (state_t *state)
 `----------------------------------------------------------------*/
 
 static void
 `----------------------------------------------------------------*/
 
 static void

-save_reductions (state_t *state)
+save_reductions (state *s)

 {
   int count = 0;
   int i;
 
 {
   int count = 0;
   int i;
 

-  /* If this is the final state, we want it to have no reductions at
-     all, although it has one for `START_SYMBOL EOF .'.  */
-  if (final_state && state->number == final_state->number)
-    return;
-

   /* Find and count the active items that represent ends of rules. */
   for (i = 0; i < nritemset; ++i)
     {
       int item = ritem[itemset[i]];
       if (item < 0)
   /* Find and count the active items that represent ends of rules. */
   for (i = 0; i < nritemset; ++i)
     {
       int item = ritem[itemset[i]];
       if (item < 0)

-       redset[count++] = -item;
+       redset[count++] = &rules[item_number_as_rule_number (item)];

     }
 
   /* Make a reductions structure and copy the data into it.  */
     }
 
   /* Make a reductions structure and copy the data into it.  */

-  state_reductions_set (state, count, redset);
+  state_reductions_set (s, count, redset);

 }
 
 \f
 }
 
 \f


@@ -307,23 +296,23 @@ save_reductions (state_t *state)
 static void
 set_states (void)
 {
 static void
 set_states (void)
 {

-  states = XCALLOC (state_t *, nstates);
+  CALLOC (states, nstates);

 
   while (first_state)
     {
 
   while (first_state)
     {

-      state_list_t *this = first_state;
+      state_list *this = first_state;

 
       /* Pessimization, but simplification of the code: make sure all
         the states have valid transitions and reductions members,
         even if reduced to 0.  It is too soon for errs, which are
         computed later, but set_conflicts.  */
 
       /* Pessimization, but simplification of the code: make sure all
         the states have valid transitions and reductions members,
         even if reduced to 0.  It is too soon for errs, which are
         computed later, but set_conflicts.  */

-      state_t *state = this->state;
-      if (!state->transitions)
-       state_transitions_set (state, 0, 0);
-      if (!state->reductions)
-       state_reductions_set (state, 0, 0);
+      state *s = this->state;
+      if (!s->transitions)
+       state_transitions_set (s, 0, 0);
+      if (!s->reductions)
+       state_reductions_set (s, 0, 0);

 
 

-      states[state->number] = state;
+      states[s->number] = s;

 
       first_state = this->next;
       free (this);
 
       first_state = this->next;
       free (this);


@@ -341,7 +330,7 @@ set_states (void)
 void
 generate_states (void)
 {
 void
 generate_states (void)
 {

-  state_list_t *list = NULL;
+  state_list *list = NULL;

   allocate_storage ();
   new_closure (nritems);
 
   allocate_storage ();
   new_closure (nritems);
 


@@ -355,28 +344,28 @@ generate_states (void)
 
   while (list)
     {
 
   while (list)
     {

-      state_t *state = list->state;
-      if (trace_flag)
+      state *s = list->state;
+      if (trace_flag & trace_automaton)

        fprintf (stderr, "Processing state %d (reached by %s)\n",
        fprintf (stderr, "Processing state %d (reached by %s)\n",

-                state->number,
-                symbols[state->accessing_symbol]->tag);
+                s->number,
+                symbols[s->accessing_symbol]->tag);

       /* Set up ruleset and itemset for the transitions out of this
          state.  ruleset gets a 1 bit for each rule that could reduce
          now.  itemset gets a vector of all the items that could be
          accepted next.  */
       /* Set up ruleset and itemset for the transitions out of this
          state.  ruleset gets a 1 bit for each rule that could reduce
          now.  itemset gets a vector of all the items that could be
          accepted next.  */

-      closure (state->items, state->nitems);
+      closure (s->items, s->nitems);

       /* Record the reductions allowed out of this state.  */
       /* Record the reductions allowed out of this state.  */

-      save_reductions (state);
+      save_reductions (s);

       /* Find the itemsets of the states that shifts can reach.  */
       /* Find the itemsets of the states that shifts can reach.  */

-      new_itemsets (state);
+      new_itemsets (s);

       /* Find or create the core structures for those states.  */
       /* Find or create the core structures for those states.  */

-      append_states (state);
+      append_states (s);

 
       /* Create the shifts structures for the shifts to those states,
         now that the state numbers transitioning to are known.  */
 
       /* Create the shifts structures for the shifts to those states,
         now that the state numbers transitioning to are known.  */

-      state_transitions_set (state, nshifts, shiftset);
+      state_transitions_set (s, nshifts, shiftset);

 
 

-      /* States are queued when they are created; process them all.
+      /* states are queued when they are created; process them all.

         */
       list = list->next;
     }
         */
       list = list->next;
     }