* src/state.h (CORE_ALLOC, SHIFTS_ALLOC, ERRS_ALLOC)

[bison.git] / src / LR0.c

diff --git a/src/LR0.c b/src/LR0.c
index b8837ac682eba186a230292e852facf103dfd038..e3db49aa4562f30cd1dd756bb9805641ebd67bb5 100644 (file)
--- a/src/LR0.c
+++ b/src/LR0.c
@@ -1,5 +1,5 @@
 /* Generate the nondeterministic finite state machine for bison,
-   Copyright (C) 1984, 1986, 1989, 2000 Free Software Foundation, Inc.
+   Copyright 1984, 1986, 1989, 2000 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -23,7 +23,6 @@
    The entry point is generate_states.  */
 
 #include "system.h"
-#include "xalloc.h"
 #include "gram.h"
 #include "state.h"
 #include "complain.h"
@@ -33,39 +32,39 @@
 
 int nstates;
 int final_state;
-core *first_state;
-shifts *first_shift;
-reductions *first_reduction;
+core *first_state = NULL;
+shifts *first_shift = NULL;
+reductions *first_reduction = NULL;
 
-static core *this_state;
-static core *last_state;
-static shifts *last_shift;
-static reductions *last_reduction;
+static core *this_state = NULL;
+static core *last_state = NULL;
+static shifts *last_shift = NULL;
+static reductions *last_reduction = NULL;
 
 static int nshifts;
-static short *shift_symbol;
+static short *shift_symbol = NULL;
 
-static short *redset;
-static short *shiftset;
+static short *redset = NULL;
+static short *shiftset = NULL;
 
-static short **kernel_base;
-static short **kernel_end;
-static short *kernel_items;
+static short **kernel_base = NULL;
+static short **kernel_end = NULL;
+static short *kernel_items = NULL;
 
 /* hash table for states, to recognize equivalent ones.  */
 
 #define        STATE_TABLE_SIZE        1009
-static core **state_table;
+static core **state_table = NULL;
 
 \f
 static void
 allocate_itemsets (void)
 {
-  short *itemp;
+  short *itemp = NULL;
   int symbol;
   int i;
   int count;
-  short *symbol_count;
+  short *symbol_count = NULL;
 
   count = 0;
   symbol_count = XCALLOC (short, nsyms);
@@ -89,7 +88,8 @@ allocate_itemsets (void)
      We allocate that much space for each symbol.  */
 
   kernel_base = XCALLOC (short *, nsyms);
-  kernel_items = XCALLOC (short, count);
+  if (count)
+    kernel_items = XCALLOC (short, count);
 
   count = 0;
   for (i = 0; i < nsyms; i++)
@@ -151,7 +151,8 @@ new_itemsets (void)
   int symbol;
 
 #if TRACE
-  fprintf (stderr, "Entering new_itemsets\n");
+  fprintf (stderr, "Entering new_itemsets, state = %d\n",
+          this_state->number);
 #endif
 
   for (i = 0; i < nsyms; i++)
@@ -200,7 +201,8 @@ new_state (int symbol)
   short *iend;
 
 #if TRACE
-  fprintf (stderr, "Entering new_state, symbol = %d\n", symbol);
+  fprintf (stderr, "Entering new_state, symbol = %d, state = %d\n",
+          symbol, nstates);
 #endif
 
   if (nstates >= MAXSHORT)
@@ -210,8 +212,7 @@ new_state (int symbol)
   iend = kernel_end[symbol];
   n = iend - isp1;
 
-  p =
-    (core *) xcalloc ((unsigned) (sizeof (core) + (n - 1) * sizeof (short)), 1);
+  p = CORE_ALLOC (n);
   p->accessing_symbol = symbol;
   p->number = nstates;
   p->nitems = n;
@@ -349,7 +350,7 @@ new_states (void)
 {
   core *p;
 
-  p = (core *) xcalloc ((unsigned) (sizeof (core) - sizeof (short)), 1);
+  p = CORE_ALLOC (0);
   first_state = last_state = this_state = p;
   nstates = 1;
 }
@@ -363,8 +364,7 @@ save_shifts (void)
   short *sp2;
   short *send;
 
-  p = (shifts *) xcalloc ((unsigned) (sizeof (shifts) +
-                                     (nshifts - 1) * sizeof (short)), 1);
+  p = SHIFTS_ALLOC (nshifts);
 
   p->number = this_state->number;
   p->nshifts = nshifts;
@@ -400,7 +400,7 @@ insert_start_shift (void)
   core *statep;
   shifts *sp;
 
-  statep = (core *) xcalloc ((unsigned) (sizeof (core) - sizeof (short)), 1);
+  statep = CORE_ALLOC (0);
   statep->number = nstates;
   statep->accessing_symbol = start_symbol;
 
@@ -408,7 +408,7 @@ insert_start_shift (void)
   last_state = statep;
 
   /* Make a shift from this state to (what will be) the final state.  */
-  sp = XCALLOC (shifts, 1);
+  sp = SHIFTS_ALLOC (1);
   sp->number = nstates++;
   sp->nshifts = 1;
   sp->shifts[0] = nstates;
@@ -465,10 +465,7 @@ augment_automaton (void)
 
              if (sp && sp->number == k)
                {
-                 sp2 = (shifts *) xcalloc ((unsigned) (sizeof (shifts)
-                                                       +
-                                                       sp->nshifts *
-                                                       sizeof (short)), 1);
+                 sp2 = SHIFTS_ALLOC (sp->nshifts + 1);
                  sp2->number = k;
                  sp2->nshifts = sp->nshifts + 1;
                  sp2->shifts[0] = nstates;
@@ -485,7 +482,7 @@ augment_automaton (void)
                }
              else
                {
-                 sp2 = XCALLOC (shifts, 1);
+                 sp2 = SHIFTS_ALLOC (1);
                  sp2->number = k;
                  sp2->nshifts = 1;
                  sp2->shifts[0] = nstates;
@@ -504,8 +501,7 @@ augment_automaton (void)
                 going to the next-to-final state (yet to be made).  */
              sp = first_shift;
 
-             sp2 = (shifts *) xcalloc (sizeof (shifts)
-                                       + sp->nshifts * sizeof (short), 1);
+             sp2 = SHIFTS_ALLOC (sp->nshifts + 1);
              sp2->nshifts = sp->nshifts + 1;
 
              /* Stick this shift into the vector at the proper place.  */
@@ -538,7 +534,7 @@ augment_automaton (void)
        {
          /* The initial state didn't even have any shifts.
             Give it one shift, to the next-to-final state.  */
-         sp = XCALLOC (shifts, 1);
+         sp = SHIFTS_ALLOC (1);
          sp->nshifts = 1;
          sp->shifts[0] = nstates;
 
@@ -556,7 +552,7 @@ augment_automaton (void)
       /* There are no shifts for any state.
          Make one shift, from the initial state to the next-to-final state.  */
 
-      sp = XCALLOC (shifts, 1);
+      sp = SHIFTS_ALLOC (1);
       sp->nshifts = 1;
       sp->shifts[0] = nstates;
 
@@ -572,13 +568,13 @@ augment_automaton (void)
   /* Make the final state--the one that follows a shift from the
      next-to-final state.
      The symbol for that shift is 0 (end-of-file).  */
-  statep = (core *) xcalloc ((unsigned) (sizeof (core) - sizeof (short)), 1);
+  statep = CORE_ALLOC (0);
   statep->number = nstates;
   last_state->next = statep;
   last_state = statep;
 
   /* Make the shift from the final state to the termination state.  */
-  sp = XCALLOC (shifts, 1);
+  sp = SHIFTS_ALLOC (1);
   sp->number = nstates++;
   sp->nshifts = 1;
   sp->shifts[0] = nstates;
@@ -590,7 +586,7 @@ augment_automaton (void)
   final_state = nstates;
 
   /* Make the termination state.  */
-  statep = (core *) xcalloc ((unsigned) (sizeof (core) - sizeof (short)), 1);
+  statep = CORE_ALLOC (0);
   statep->number = nstates++;
   last_state->next = statep;
   last_state = statep;
@@ -629,8 +625,7 @@ save_reductions (void)
 
   if (count)
     {
-      p = (reductions *) xcalloc ((unsigned) (sizeof (reductions) +
-                                             (count - 1) * sizeof (short)), 1);
+      p = REDUCTIONS_ALLOC (count);
 
       p->number = this_state->number;
       p->nreds = count;