* data/glr.c: Correct typo in Emacs-mode directive. Slightly

[bison.git] / src / lalr.c

diff --git a/src/lalr.c b/src/lalr.c
index c16c6f52dafaea945a222c3f6103f32c6c312cf2..14a3e2318537301d4da4e722aa862fa59d4db3cc 100644 (file)
--- a/src/lalr.c
+++ b/src/lalr.c
@@ -1,5 +1,6 @@
 /* Compute look-ahead criteria for bison,
 /* 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.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -24,11 +25,14 @@
    tokens they accept.  */
 
 #include "system.h"
    tokens they accept.  */
 
 #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 "reader.h"
 #include "types.h"
 #include "LR0.h"

-#include "symtab.h"
-#include "gram.h"

 #include "complain.h"
 #include "lalr.h"
 #include "nullable.h"
 #include "complain.h"
 #include "lalr.h"
 #include "nullable.h"


@@ -38,20 +42,18 @@
 /* All the decorated states, indexed by the state number.  */
 state_t **states = NULL;
 
 /* All the decorated states, indexed by the state number.  */
 state_t **states = NULL;
 

-int tokensetsize;
-short *LAruleno;
-unsigned *LA;
+rule_t **LArule = NULL;
+bitsetv LA = NULL;

 size_t nLA;
 
 static int ngotos;
 size_t nLA;
 
 static int ngotos;

-short *goto_map;
-short *from_state;
-short *to_state;
+short *goto_map = NULL;
+short *from_state = NULL;
+short *to_state = NULL;

 
 /* And for the famous F variable, which name is so descriptive that a
    comment is hardly needed.  <grin>.  */
 
 /* 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;
 
 static short **includes;
 static shorts **lookback;


@@ -74,9 +76,7 @@ static void
 traverse (int i)
 {
   int j;
 traverse (int i)
 {
   int j;

-  size_t k;

   int height;
   int height;

-  size_t size = F (i + 1) - F(i);

 
   VERTICES[++top] = i;
   INDEX[i] = height = top;
 
   VERTICES[++top] = i;
   INDEX[i] = height = top;


@@ -90,8 +90,7 @@ traverse (int i)
        if (INDEX[i] > INDEX[R[i][j]])
          INDEX[i] = INDEX[R[i][j]];
 
        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)
       }
 
   if (INDEX[i] == height)


@@ -103,8 +102,7 @@ traverse (int i)
        if (i == j)
          break;
 
        if (i == j)
          break;
 

-       for (k = 0; k < size; ++k)
-         F (j)[k] = F (i)[k];
+       bitset_copy (F[j], F[i]);

       }
 }
 
       }
 }
 


@@ -136,30 +134,31 @@ digraph (short **relation)
 static void
 initialize_LA (void)
 {
 static void
 initialize_LA (void)
 {

-  int i;
+  size_t i;

   int j;
   int j;

-  short *np;
+  rule_t **np;

 
   /* Avoid having to special case 0.  */
   if (!nLA)
     nLA = 1;
 
 
   /* Avoid having to special case 0.  */
   if (!nLA)
     nLA = 1;
 

-  LA = XCALLOC (unsigned, nLA * tokensetsize);
-  LAruleno = XCALLOC (short, nLA);
+  LA = bitsetv_create (nLA, ntokens, BITSET_FIXED);
+  LArule = XCALLOC (rule_t *, nLA);

   lookback = XCALLOC (shorts *, 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++)
   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]];

 }
 
 
 static void
 set_goto_map (void)
 {
 }
 
 
 static void
 set_goto_map (void)
 {

-  int state, i;
+  size_t state;
+  int i;

   short *temp_map;
 
   goto_map = XCALLOC (short, nvars + 1) - ntokens;
   short *temp_map;
 
   goto_map = XCALLOC (short, nvars + 1) - ntokens;


@@ -171,8 +170,8 @@ set_goto_map (void)
       shifts *sp = states[state]->shifts;
       for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
        {
       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)]++;
 
          ngotos++;
          goto_map[SHIFT_SYMBOL (sp, i)]++;


@@ -218,7 +217,7 @@ set_goto_map (void)
 `----------------------------------------------------------*/
 
 static int
 `----------------------------------------------------------*/
 
 static int

-map_goto (int state, int symbol)
+map_goto (int state, symbol_number_t symbol)

 {
   int high;
   int low;
 {
   int high;
   int low;


@@ -255,7 +254,7 @@ initialize_F (void)
 
   int i;
 
 
   int i;
 

-  F = XCALLOC (unsigned, ngotos * tokensetsize);
+  F = bitsetv_create (ngotos, ntokens, BITSET_FIXED);

 
   for (i = 0; i < ngotos; i++)
     {
 
   for (i = 0; i < ngotos; i++)
     {


@@ -264,11 +263,11 @@ initialize_F (void)
 
       int j;
       for (j = 0; j < sp->nshifts && SHIFT_IS_SHIFT (sp, j); j++)
 
       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++)
        {
 
       for (; j < sp->nshifts; j++)
        {

-         int symbol = SHIFT_SYMBOL (sp, j);
+         symbol_number_t symbol = SHIFT_SYMBOL (sp, j);

          if (nullable[symbol])
            edge[nedges++] = map_goto (stateno, symbol);
        }
          if (nullable[symbol])
            edge[nedges++] = map_goto (stateno, symbol);
        }


@@ -276,7 +275,7 @@ initialize_F (void)
       if (nedges)
        {
          reads[i] = XCALLOC (short, nedges + 1);
       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;
        }
          reads[i][nedges] = -1;
          nedges = 0;
        }


@@ -299,15 +298,15 @@ add_lookback_edge (state_t *state, int ruleno, int gotono)
   shorts *sp;
 
   for (i = 0; i < state->nlookaheads; ++i)
   shorts *sp;
 
   for (i = 0; i < state->nlookaheads; ++i)

-    if (LAruleno[state->lookaheadsp + i] == ruleno)
+    if (state->lookaheads_rule[i]->number == ruleno)

       break;
 
       break;
 

-  assert (LAruleno[state->lookaheadsp + i] == ruleno);
+  assert (state->lookaheads_rule[i]->number == ruleno);

 
   sp = XCALLOC (shorts, 1);
 
   sp = XCALLOC (shorts, 1);

-  sp->next = lookback[state->lookaheadsp + i];
+  sp->next = lookback[(state->lookaheads - LA) + i];

   sp->value = gotono;
   sp->value = gotono;

-  lookback[state->lookaheadsp + i] = sp;
+  lookback[(state->lookaheads - LA) + i] = sp;

 }
 
 
 }
 
 


@@ -409,25 +408,26 @@ build_relations (void)
   for (i = 0; i < ngotos; i++)
     {
       int nedges = 0;
   for (i = 0; i < ngotos; i++)
     {
       int nedges = 0;

-      int symbol1 = states[to_state[i]]->accessing_symbol;
+      symbol_number_t symbol1 = states[to_state[i]]->accessing_symbol;

       short *rulep;
 
       for (rulep = derives[symbol1]; *rulep > 0; rulep++)
        {
          int done;
          int length = 1;
       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;
 
          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]];
            {
              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_symbol_number (*rp))

                    break;
                }
 
                    break;
                }
 


@@ -446,7 +446,9 @@ build_relations (void)
              /* JF added rp>=ritem &&   I hope to god its right! */
              if (rp >= ritem && ISVAR (*rp))
                {
              /* 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 symbol_number_t. */
+                 edge[nedges++] = map_goto (states1[--length],
+                                            item_number_as_symbol_number (*rp));

                  if (nullable[*rp])
                    done = 0;
                }
                  if (nullable[*rp])
                    done = 0;
                }


@@ -493,31 +495,29 @@ compute_lookaheads (void)
 
   for (i = 0; i < nLA; i++)
     for (sp = lookback[i]; sp; sp = sp->next)
 
   for (i = 0; i < nLA; i++)
     for (sp = lookback[i]; sp; sp = sp->next)

-      {
-       int size = LA (i + 1) - LA (i);
-       int j;
-       for (j = 0; j < size; ++j)
-         LA (i)[j] |= F (sp->value)[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);
 
   /* Free LOOKBACK. */
   for (i = 0; i < nLA; i++)
     LIST_FREE (shorts, lookback[i]);
 
   XFREE (lookback);

-  XFREE (F);
+  bitsetv_free (F);

 }
 
 
 }
 
 

-/*--------------------------------------.
-| Initializing the lookaheads members.  |
-`--------------------------------------*/
+/*-------------------------------------------------------------.
+| Count the number of lookaheads required for each state       |
+| (NLOOKAHEADS member).  Compute the total number of LA, NLA.  |
+`-------------------------------------------------------------*/

 
 static void
 
 static void

-initialize_lookaheads (void)
+states_lookaheads_count (void)

 {
 {

-  int i;
+  size_t i;

   nLA = 0;
   nLA = 0;

+
+  /* Count   */

   for (i = 0; i < nstates; i++)
     {
       int k;
   for (i = 0; i < nstates; i++)
     {
       int k;


@@ -543,12 +543,34 @@ initialize_lookaheads (void)
          }
 
       states[i]->nlookaheads = nlookaheads;
          }
 
       states[i]->nlookaheads = nlookaheads;

-      states[i]->lookaheadsp = nLA;

       nLA += nlookaheads;
     }
 }
 
 
       nLA += nlookaheads;
     }
 }
 
 

+/*--------------------------------------.
+| Initializing the lookaheads members.  |
+`--------------------------------------*/
+
+static void
+states_lookaheads_initialize (void)
+{
+  size_t i;
+  bitsetv pLA = LA;
+  rule_t **pLArule = LArule;
+
+  /* Initialize the members LOOKAHEADS and LOOKAHEADS_RULE for each
+     state.  */
+  for (i = 0; i < nstates; i++)
+    {
+      states[i]->lookaheads = pLA;
+      states[i]->lookaheads_rule = pLArule;
+      pLA += states[i]->nlookaheads;
+      pLArule += states[i]->nlookaheads;
+    }
+}
+
+

 /*---------------------------------------.
 | Output the lookaheads for each state.  |
 `---------------------------------------*/
 /*---------------------------------------.
 | Output the lookaheads for each state.  |
 `---------------------------------------*/


@@ -556,7 +578,8 @@ initialize_lookaheads (void)
 static void
 lookaheads_print (FILE *out)
 {
 static void
 lookaheads_print (FILE *out)
 {

-  int i, j, k;
+  size_t i;
+  int j, k;

   fprintf (out, "Lookaheads: BEGIN\n");
   for (i = 0; i < nstates; ++i)
     {
   fprintf (out, "Lookaheads: BEGIN\n");
   for (i = 0; i < nstates; ++i)
     {


@@ -565,10 +588,10 @@ lookaheads_print (FILE *out)
 
       for (j = 0; j < states[i]->nlookaheads; ++j)
        for (k = 0; k < ntokens; ++k)
 
       for (j = 0; j < states[i]->nlookaheads; ++j)
        for (k = 0; k < ntokens; ++k)

-         if (BITISSET (LA (states[i]->lookaheadsp + j), j))
+         if (bitset_test (states[i]->lookaheads[j], k))

            fprintf (out, "   on %d (%s) -> rule %d\n",
            fprintf (out, "   on %d (%s) -> rule %d\n",

-                    k, symbols[k]->tag,
-                    -LAruleno[states[i]->lookaheadsp + j] - 1);
+                    k, symbol_tag_get (symbols[k]),
+                    states[i]->lookaheads_rule[j]->number - 1);

     }
   fprintf (out, "Lookaheads: END\n");
 }
     }
   fprintf (out, "Lookaheads: END\n");
 }


@@ -576,10 +599,9 @@ lookaheads_print (FILE *out)
 void
 lalr (void)
 {
 void
 lalr (void)
 {

-  tokensetsize = WORDSIZE (ntokens);
-
-  initialize_lookaheads ();
+  states_lookaheads_count ();

   initialize_LA ();
   initialize_LA ();

+  states_lookaheads_initialize ();

   set_goto_map ();
   initialize_F ();
   build_relations ();
   set_goto_map ();
   initialize_F ();
   build_relations ();