Point to an official beta.

[bison.git] / src / lalr.c

diff --git a/src/lalr.c b/src/lalr.c
index 30e9f31895b7ed6851ce44882dcc05b70ecb5544..643f8fd91d20ab78bf6f460dde57cd424e8f67d1 100644 (file)
--- a/src/lalr.c
+++ b/src/lalr.c
@@ -1,5 +1,6 @@
 /* Compute look-ahead criteria for bison,
-   Copyright 1984, 1986, 1989, 2000, 2001  Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002
+   Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -25,11 +26,13 @@
 
 #include "system.h"
 #include "bitset.h"
+#include "bitsetv.h"
+#include "quotearg.h"
+#include "symtab.h"
+#include "gram.h"
 #include "reader.h"
 #include "types.h"
 #include "LR0.h"
-#include "symtab.h"
-#include "gram.h"
 #include "complain.h"
 #include "lalr.h"
 #include "nullable.h"
@@ -39,9 +42,8 @@
 /* All the decorated states, indexed by the state number.  */
 state_t **states = NULL;
 
-int tokensetsize;
-short *LAruleno = NULL;
-bitset *LA = NULL;
+rule_t **LArule = NULL;
+bitsetv LA = NULL;
 size_t nLA;
 
 static int ngotos;
@@ -51,8 +53,7 @@ short *to_state = NULL;
 
 /* And for the famous F variable, which name is so descriptive that a
    comment is hardly needed.  <grin>.  */
-static unsigned *F = NULL;
-#define F(Rule)  (F + (Rule) * tokensetsize)
+static bitsetv F = NULL;
 
 static short **includes;
 static shorts **lookback;
@@ -75,9 +76,7 @@ static void
 traverse (int i)
 {
   int j;
-  size_t k;
   int height;
-  size_t size = F (i + 1) - F(i);
 
   VERTICES[++top] = i;
   INDEX[i] = height = top;
@@ -91,8 +90,7 @@ traverse (int i)
        if (INDEX[i] > INDEX[R[i][j]])
          INDEX[i] = INDEX[R[i][j]];
 
-       for (k = 0; k < size; ++k)
-         F (i)[k] |= F (R[i][j])[k];
+       bitset_or (F[i], F[i], F[R[i][j]]);
       }
 
   if (INDEX[i] == height)
@@ -104,8 +102,7 @@ traverse (int i)
        if (i == j)
          break;
 
-       for (k = 0; k < size; ++k)
-         F (j)[k] = F (i)[k];
+       bitset_copy (F[j], F[i]);
       }
 }
 
@@ -139,26 +136,21 @@ initialize_LA (void)
 {
   size_t i;
   int j;
-  short *np;
+  rule_t **np;
 
   /* Avoid having to special case 0.  */
   if (!nLA)
     nLA = 1;
 
-  LA = XCALLOC (bitset, nLA);
-  for (i = 0; i < nLA; ++i)
-    {
-      LA[i] = bitset_create (ntokens, BITSET_FIXED);
-      bitset_zero (LA[i]);
-    }
-  LAruleno = XCALLOC (short, nLA);
+  LA = bitsetv_create (nLA, ntokens, BITSET_FIXED);
+  LArule = XCALLOC (rule_t *, nLA);
   lookback = XCALLOC (shorts *, nLA);
 
-  np = LAruleno;
+  np = LArule;
   for (i = 0; i < nstates; i++)
     if (!states[i]->consistent)
       for (j = 0; j < states[i]->reductions->nreds; j++)
-       *np++ = states[i]->reductions->rules[j];
+       *np++ = &rules[states[i]->reductions->rules[j]];
 }
 
 
@@ -178,8 +170,8 @@ set_goto_map (void)
       shifts *sp = states[state]->shifts;
       for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
        {
-         if (ngotos == MAXSHORT)
-           fatal (_("too many gotos (max %d)"), MAXSHORT);
+         if (ngotos == SHRT_MAX)
+           fatal (_("too many gotos (max %d)"), SHRT_MAX);
 
          ngotos++;
          goto_map[SHIFT_SYMBOL (sp, i)]++;
@@ -225,7 +217,7 @@ set_goto_map (void)
 `----------------------------------------------------------*/
 
 static int
-map_goto (int state, int symbol)
+map_goto (int state, token_number_t symbol)
 {
   int high;
   int low;
@@ -262,7 +254,7 @@ initialize_F (void)
 
   int i;
 
-  F = XCALLOC (unsigned, ngotos * tokensetsize);
+  F = bitsetv_create (ngotos, ntokens, BITSET_FIXED);
 
   for (i = 0; i < ngotos; i++)
     {
@@ -271,11 +263,11 @@ initialize_F (void)
 
       int j;
       for (j = 0; j < sp->nshifts && SHIFT_IS_SHIFT (sp, j); j++)
-       SETBIT (F (i), SHIFT_SYMBOL (sp, j));
+       bitset_set (F[i], SHIFT_SYMBOL (sp, j));
 
       for (; j < sp->nshifts; j++)
        {
-         int symbol = SHIFT_SYMBOL (sp, j);
+         token_number_t symbol = SHIFT_SYMBOL (sp, j);
          if (nullable[symbol])
            edge[nedges++] = map_goto (stateno, symbol);
        }
@@ -283,7 +275,7 @@ initialize_F (void)
       if (nedges)
        {
          reads[i] = XCALLOC (short, nedges + 1);
-         shortcpy (reads[i], edge, nedges);
+         memcpy (reads[i], edge, nedges * sizeof (edge[0]));
          reads[i][nedges] = -1;
          nedges = 0;
        }
@@ -306,10 +298,10 @@ add_lookback_edge (state_t *state, int ruleno, int gotono)
   shorts *sp;
 
   for (i = 0; i < state->nlookaheads; ++i)
-    if (LAruleno[state->lookaheadsp + i] == ruleno)
+    if (LArule[state->lookaheadsp + i]->number == ruleno)
       break;
 
-  assert (LAruleno[state->lookaheadsp + i] == ruleno);
+  assert (LArule[state->lookaheadsp + i]->number == ruleno);
 
   sp = XCALLOC (shorts, 1);
   sp->next = lookback[state->lookaheadsp + i];
@@ -416,25 +408,26 @@ build_relations (void)
   for (i = 0; i < ngotos; i++)
     {
       int nedges = 0;
-      int symbol1 = states[to_state[i]]->accessing_symbol;
+      token_number_t symbol1 = states[to_state[i]]->accessing_symbol;
       short *rulep;
 
       for (rulep = derives[symbol1]; *rulep > 0; rulep++)
        {
          int done;
          int length = 1;
-         short *rp;
+         item_number_t *rp;
          state_t *state = states[from_state[i]];
          states1[0] = state->number;
 
-         for (rp = &ritem[rules[*rulep].rhs]; *rp >= 0; rp++)
+         for (rp = rules[*rulep].rhs; *rp >= 0; rp++)
            {
              shifts *sp = state->shifts;
              int j;
              for (j = 0; j < sp->nshifts; j++)
                {
                  state = states[sp->shifts[j]];
-                 if (state->accessing_symbol == *rp)
+                 if (state->accessing_symbol
+                     == item_number_as_token_number (*rp))
                    break;
                }
 
@@ -453,7 +446,9 @@ build_relations (void)
              /* JF added rp>=ritem &&   I hope to god its right! */
              if (rp >= ritem && ISVAR (*rp))
                {
-                 edge[nedges++] = map_goto (states1[--length], *rp);
+                 /* Downcasting from item_number_t to token_number_t. */
+                 edge[nedges++] = map_goto (states1[--length],
+                                            item_number_as_token_number (*rp));
                  if (nullable[*rp])
                    done = 0;
                }
@@ -500,19 +495,14 @@ compute_lookaheads (void)
 
   for (i = 0; i < nLA; i++)
     for (sp = lookback[i]; sp; sp = sp->next)
-      {
-       int j;
-       for (j = 0; j < ntokens; ++j)
-         if (BITISSET (F (sp->value), j))
-           bitset_set (LA[i], j);
-      }
+      bitset_or (LA[i], LA[i], F[sp->value]);
 
   /* Free LOOKBACK. */
   for (i = 0; i < nLA; i++)
     LIST_FREE (shorts, lookback[i]);
 
   XFREE (lookback);
-  XFREE (F);
+  bitsetv_free (F);
 }
 
 
@@ -573,10 +563,10 @@ lookaheads_print (FILE *out)
 
       for (j = 0; j < states[i]->nlookaheads; ++j)
        for (k = 0; k < ntokens; ++k)
-         if (bitset_test (LA[states[i]->lookaheadsp + j], j))
+         if (bitset_test (LA[states[i]->lookaheadsp + j], k))
            fprintf (out, "   on %d (%s) -> rule %d\n",
-                    k, symbols[k]->tag,
-                    -LAruleno[states[i]->lookaheadsp + j] - 1);
+                    k, quotearg_style (escape_quoting_style, symbols[k]->tag),
+                    LArule[states[i]->lookaheadsp + j]->number - 1);
     }
   fprintf (out, "Lookaheads: END\n");
 }
@@ -584,8 +574,6 @@ lookaheads_print (FILE *out)
 void
 lalr (void)
 {
-  tokensetsize = WORDSIZE (ntokens);
-
   initialize_lookaheads ();
   initialize_LA ();
   set_goto_map ();