* src/symtab.h, src/symtab.c (symbol_t): printer and

[bison.git] / src / lalr.c

diff --git a/src/lalr.c b/src/lalr.c
index bd739dbf2b8ff69171acf56444d6c25bd4958181..14a3e2318537301d4da4e722aa862fa59d4db3cc 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.
 
@@ -26,11 +27,12 @@
 #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"
@@ -40,7 +42,7 @@
 /* All the decorated states, indexed by the state number.  */
 state_t **states = NULL;
 
-short *LAruleno = NULL;
+rule_t **LArule = NULL;
 bitsetv LA = NULL;
 size_t nLA;
 
@@ -134,21 +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 = bitsetv_create (nLA, ntokens, BITSET_FIXED);
-  LAruleno = XCALLOC (short, nLA);
+  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]];
 }
 
 
@@ -168,8 +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)]++;
@@ -215,7 +217,7 @@ set_goto_map (void)
 `----------------------------------------------------------*/
 
 static int
-map_goto (int state, int symbol)
+map_goto (int state, symbol_number_t symbol)
 {
   int high;
   int low;
@@ -265,7 +267,7 @@ initialize_F (void)
 
       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);
        }
@@ -273,7 +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;
        }
@@ -296,15 +298,15 @@ 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 (state->lookaheads_rule[i]->number == ruleno)
       break;
 
-  assert (LAruleno[state->lookaheadsp + i] == ruleno);
+  assert (state->lookaheads_rule[i]->number == ruleno);
 
   sp = XCALLOC (shorts, 1);
-  sp->next = lookback[state->lookaheadsp + i];
+  sp->next = lookback[(state->lookaheads - LA) + i];
   sp->value = gotono;
-  lookback[state->lookaheadsp + i] = sp;
+  lookback[(state->lookaheads - LA) + i] = sp;
 }
 
 
@@ -406,25 +408,26 @@ build_relations (void)
   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 *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_symbol_number (*rp))
                    break;
                }
 
@@ -443,7 +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 symbol_number_t. */
+                 edge[nedges++] = map_goto (states1[--length],
+                                            item_number_as_symbol_number (*rp));
                  if (nullable[*rp])
                    done = 0;
                }
@@ -501,15 +506,18 @@ compute_lookaheads (void)
 }
 
 
-/*--------------------------------------.
-| Initializing the lookaheads members.  |
-`--------------------------------------*/
+/*-------------------------------------------------------------.
+| Count the number of lookaheads required for each state       |
+| (NLOOKAHEADS member).  Compute the total number of LA, NLA.  |
+`-------------------------------------------------------------*/
 
 static void
-initialize_lookaheads (void)
+states_lookaheads_count (void)
 {
   size_t i;
   nLA = 0;
+
+  /* Count   */
   for (i = 0; i < nstates; i++)
     {
       int k;
@@ -535,12 +543,34 @@ initialize_lookaheads (void)
          }
 
       states[i]->nlookaheads = nlookaheads;
-      states[i]->lookaheadsp = nLA;
       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.  |
 `---------------------------------------*/
@@ -558,10 +588,10 @@ 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 (states[i]->lookaheads[j], k))
            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");
 }
@@ -569,8 +599,9 @@ lookaheads_print (FILE *out)
 void
 lalr (void)
 {
-  initialize_lookaheads ();
+  states_lookaheads_count ();
   initialize_LA ();
+  states_lookaheads_initialize ();
   set_goto_map ();
   initialize_F ();
   build_relations ();