X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6aa452a643c65a8df244013e05d41854531ec762..f7737e2e16cb9a49c258ac4b82b2b5f4fa9d0f18:/lib/abitset.c

diff --git a/lib/abitset.c b/lib/abitset.c
index 9eb2eeb9..2d5ca293 100644
--- a/lib/abitset.c
+++ b/lib/abitset.c
@@ -14,7 +14,7 @@
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
 
 #ifdef HAVE_CONFIG_H
@@ -22,49 +22,21 @@
 #endif
 
 #include "abitset.h"
+#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 
 /* This file implements fixed size bitsets stored as an array
    of words.  Any unused bits in the last word must be zero.  */
 
-typedef struct abitset_struct
-{
-  unsigned int n_bits;	/* Number of bits.  */
-  bitset_word words[1];	/* The array of bits.  */
-}
-*abitset;
-
-
-struct bitset_struct
-{
-  struct bbitset_struct b;
-  struct abitset_struct a;
-};
-
-static void abitset_unused_clear PARAMS ((bitset));
-
-static int abitset_small_list PARAMS ((bitset, bitset_bindex *, bitset_bindex,
-				       bitset_bindex *));
-
-static void abitset_set PARAMS ((bitset, bitset_bindex));
-static void abitset_reset PARAMS ((bitset, bitset_bindex));
-static int abitset_test PARAMS ((bitset, bitset_bindex));
-static int abitset_size PARAMS ((bitset));
-static int abitset_list PARAMS ((bitset, bitset_bindex *, bitset_bindex,
-				 bitset_bindex *));
-static int abitset_list_reverse
-PARAMS ((bitset, bitset_bindex *, bitset_bindex, bitset_bindex *));
-
 #define ABITSET_N_WORDS(N) (((N) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS)
 #define ABITSET_WORDS(X) ((X)->a.words)
 #define ABITSET_N_BITS(X) ((X)->a.n_bits)
 
 
 /* Return size in bits of bitset SRC.  */
-static int
-abitset_size (src)
-     bitset src;
+static bitset_bindex
+abitset_size (bitset src)
 {
   return ABITSET_N_BITS (src);
 }
@@ -73,12 +45,9 @@ abitset_size (src)
 /* Find list of up to NUM bits set in BSET starting from and including
  *NEXT and store in array LIST.  Return with actual number of bits
  found and with *NEXT indicating where search stopped.  */
-static int
-abitset_small_list (src, list, num, next)
-     bitset src;
-     bitset_bindex *list;
-     bitset_bindex num;
-     bitset_bindex *next;
+static bitset_bindex
+abitset_small_list (bitset src, bitset_bindex *list,
+		    bitset_bindex num, bitset_bindex *next)
 {
   bitset_bindex bitno;
   bitset_bindex count;
@@ -134,9 +103,7 @@ abitset_small_list (src, list, num, next)
 
 /* Set bit BITNO in bitset DST.  */
 static void
-abitset_set (dst, bitno)
-     bitset dst ATTRIBUTE_UNUSED;
-     bitset_bindex bitno ATTRIBUTE_UNUSED;
+abitset_set (bitset dst ATTRIBUTE_UNUSED, bitset_bindex bitno ATTRIBUTE_UNUSED)
 {
   /* This should never occur for abitsets since we should always
      hit the cache.  */
@@ -146,9 +113,8 @@ abitset_set (dst, bitno)
 
 /* Reset bit BITNO in bitset DST.  */
 static void
-abitset_reset (dst, bitno)
-     bitset dst ATTRIBUTE_UNUSED;
-     bitset_bindex bitno ATTRIBUTE_UNUSED;
+abitset_reset (bitset dst ATTRIBUTE_UNUSED,
+	       bitset_bindex bitno ATTRIBUTE_UNUSED)
 {
   /* This should never occur for abitsets since we should always
      hit the cache.  */
@@ -158,9 +124,8 @@ abitset_reset (dst, bitno)
 
 /* Test bit BITNO in bitset SRC.  */
 static int
-abitset_test (src, bitno)
-     bitset src ATTRIBUTE_UNUSED;
-     bitset_bindex bitno ATTRIBUTE_UNUSED;
+abitset_test (bitset src ATTRIBUTE_UNUSED,
+	      bitset_bindex bitno ATTRIBUTE_UNUSED)
 {
   /* This should never occur for abitsets since we should always
      hit the cache.  */
@@ -173,12 +138,9 @@ abitset_test (src, bitno)
    from and including NEXT and store in array LIST.  Return with
    actual number of bits found and with *NEXT indicating where search
    stopped.  */
-static int
-abitset_list_reverse (src, list, num, next)
-     bitset src;
-     bitset_bindex *list;
-     bitset_bindex num;
-     bitset_bindex *next;
+static bitset_bindex
+abitset_list_reverse (bitset src, bitset_bindex *list,
+		      bitset_bindex num, bitset_bindex *next)
 {
   bitset_bindex bitno;
   bitset_bindex rbitno;
@@ -236,12 +198,9 @@ abitset_list_reverse (src, list, num, next)
 /* Find list of up to NUM bits set in BSET starting from and including
  *NEXT and store in array LIST.  Return with actual number of bits
  found and with *NEXT indicating where search stopped.  */
-static int
-abitset_list (src, list, num, next)
-     bitset src;
-     bitset_bindex *list;
-     bitset_bindex num;
-     bitset_bindex *next;
+static bitset_bindex
+abitset_list (bitset src, bitset_bindex *list,
+	      bitset_bindex num, bitset_bindex *next)
 {
   bitset_bindex bitno;
   bitset_bindex count;
@@ -341,8 +300,7 @@ abitset_list (src, list, num, next)
 
 /* Ensure that any unused bits within the last word are clear.  */
 static inline void
-abitset_unused_clear (dst)
-     bitset dst;
+abitset_unused_clear (bitset dst)
 {
   unsigned int last_bit;
 
@@ -354,11 +312,10 @@ abitset_unused_clear (dst)
 
 
 static void
-abitset_ones (dst)
-     bitset dst;
+abitset_ones (bitset dst)
 {
   bitset_word *dstp = ABITSET_WORDS (dst);
-  unsigned int bytes;
+  size_t bytes;
 
   bytes = sizeof (bitset_word) * dst->b.csize;
 
@@ -368,11 +325,10 @@ abitset_ones (dst)
 
 
 static void
-abitset_zero (dst)
-     bitset dst;
+abitset_zero (bitset dst)
 {
   bitset_word *dstp = ABITSET_WORDS (dst);
-  unsigned int bytes;
+  size_t bytes;
 
   bytes = sizeof (bitset_word) * dst->b.csize;
 
@@ -381,10 +337,9 @@ abitset_zero (dst)
 
 
 static int
-abitset_empty_p (dst)
-     bitset dst;
+abitset_empty_p (bitset dst)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *dstp = ABITSET_WORDS (dst);
 
   for (i = 0; i < dst->b.csize; i++)
@@ -396,9 +351,7 @@ abitset_empty_p (dst)
 
 
 static void
-abitset_copy1 (dst, src)
-     bitset dst;
-     bitset src;
+abitset_copy1 (bitset dst, bitset src)
 {
   bitset_word *srcp = ABITSET_WORDS (src);
   bitset_word *dstp = ABITSET_WORDS (dst);
@@ -411,11 +364,9 @@ abitset_copy1 (dst, src)
 
 
 static void
-abitset_not (dst, src)
-     bitset dst;
-     bitset src;
+abitset_not (bitset dst, bitset src)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *srcp = ABITSET_WORDS (src);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
@@ -425,13 +376,11 @@ abitset_not (dst, src)
   abitset_unused_clear (dst);
 }
 
- 
+
 static int
-abitset_equal_p (dst, src)
-     bitset dst;
-     bitset src;
+abitset_equal_p (bitset dst, bitset src)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *srcp = ABITSET_WORDS (src);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
@@ -444,15 +393,13 @@ abitset_equal_p (dst, src)
 
 
 static int
-abitset_subset_p (dst, src)
-     bitset dst;
-     bitset src;
+abitset_subset_p (bitset dst, bitset src)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *srcp = ABITSET_WORDS (src);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
-  
+
   for (i = 0; i < size; i++, dstp++, srcp++)
       if (*dstp != (*srcp | *dstp))
 	  return 0;
@@ -461,11 +408,9 @@ abitset_subset_p (dst, src)
 
 
 static int
-abitset_disjoint_p (dst, src)
-     bitset dst;
-     bitset src;
+abitset_disjoint_p (bitset dst, bitset src)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *srcp = ABITSET_WORDS (src);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
@@ -479,12 +424,9 @@ abitset_disjoint_p (dst, src)
 
 
 static void
-abitset_and (dst, src1, src2)
-     bitset dst;
-     bitset src1;
-     bitset src2;
+abitset_and (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *dstp = ABITSET_WORDS (dst);
@@ -496,12 +438,9 @@ abitset_and (dst, src1, src2)
 
 
 static int
-abitset_and_cmp (dst, src1, src2)
-     bitset dst;
-     bitset src1;
-     bitset src2;
+abitset_and_cmp (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
+  bitset_windex i;
   int changed = 0;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
@@ -511,7 +450,7 @@ abitset_and_cmp (dst, src1, src2)
   for (i = 0; i < size; i++, dstp++)
     {
       bitset_word tmp = *src1p++ & *src2p++;
-      
+
       if (*dstp != tmp)
 	{
 	  changed = 1;
@@ -523,12 +462,9 @@ abitset_and_cmp (dst, src1, src2)
 
 
 static void
-abitset_andn (dst, src1, src2)
-     bitset dst;
-     bitset src1;
-     bitset src2;
+abitset_andn (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *dstp = ABITSET_WORDS (dst);
@@ -540,22 +476,19 @@ abitset_andn (dst, src1, src2)
 
 
 static int
-abitset_andn_cmp (dst, src1, src2)
-     bitset dst;
-     bitset src1;
-     bitset src2;
+abitset_andn_cmp (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
+  bitset_windex i;
   int changed = 0;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
-  
+
   for (i = 0; i < size; i++, dstp++)
     {
       bitset_word tmp = *src1p++ & ~(*src2p++);
-      
+
       if (*dstp != tmp)
 	{
 	  changed = 1;
@@ -567,12 +500,9 @@ abitset_andn_cmp (dst, src1, src2)
 
 
 static void
-abitset_or (dst, src1, src2)
-     bitset dst;
-     bitset src1;
-     bitset src2;
+abitset_or (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *dstp = ABITSET_WORDS (dst);
@@ -584,12 +514,9 @@ abitset_or (dst, src1, src2)
 
 
 static int
-abitset_or_cmp (dst, src1, src2)
-     bitset dst;
-     bitset src1;
-     bitset src2;
+abitset_or_cmp (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
+  bitset_windex i;
   int changed = 0;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
@@ -599,7 +526,7 @@ abitset_or_cmp (dst, src1, src2)
   for (i = 0; i < size; i++, dstp++)
     {
       bitset_word tmp = *src1p++ | *src2p++;
-      
+
       if (*dstp != tmp)
 	{
 	  changed = 1;
@@ -611,12 +538,9 @@ abitset_or_cmp (dst, src1, src2)
 
 
 static void
-abitset_xor (dst, src1, src2)
-     bitset dst;
-     bitset src1;
-     bitset src2;
+abitset_xor (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *dstp = ABITSET_WORDS (dst);
@@ -628,12 +552,9 @@ abitset_xor (dst, src1, src2)
 
 
 static int
-abitset_xor_cmp (dst, src1, src2)
-     bitset dst;
-     bitset src1;
-     bitset src2;
+abitset_xor_cmp (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
+  bitset_windex i;
   int changed = 0;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
@@ -643,7 +564,7 @@ abitset_xor_cmp (dst, src1, src2)
   for (i = 0; i < size; i++, dstp++)
     {
       bitset_word tmp = *src1p++ ^ *src2p++;
-      
+
       if (*dstp != tmp)
 	{
 	  changed = 1;
@@ -655,43 +576,35 @@ abitset_xor_cmp (dst, src1, src2)
 
 
 static void
-abitset_and_or (dst, src1, src2, src3)
-     bitset dst;
-     bitset src1;
-     bitset src2;
-     bitset src3;
+abitset_and_or (bitset dst, bitset src1, bitset src2, bitset src3)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *src3p = ABITSET_WORDS (src3);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
-  
+
   for (i = 0; i < size; i++)
       *dstp++ = (*src1p++ & *src2p++) | *src3p++;
 }
 
 
 static int
-abitset_and_or_cmp (dst, src1, src2, src3)
-     bitset dst;
-     bitset src1;
-     bitset src2;
-     bitset src3;
+abitset_and_or_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
 {
-  unsigned int i;
+  bitset_windex i;
   int changed = 0;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *src3p = ABITSET_WORDS (src3);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
-  
+
   for (i = 0; i < size; i++, dstp++)
     {
       bitset_word tmp = (*src1p++ & *src2p++) | *src3p++;
-      
+
       if (*dstp != tmp)
 	{
 	  changed = 1;
@@ -703,43 +616,35 @@ abitset_and_or_cmp (dst, src1, src2, src3)
 
 
 static void
-abitset_andn_or (dst, src1, src2, src3)
-     bitset dst;
-     bitset src1;
-     bitset src2;
-     bitset src3;
+abitset_andn_or (bitset dst, bitset src1, bitset src2, bitset src3)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *src3p = ABITSET_WORDS (src3);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
-  
+
   for (i = 0; i < size; i++)
       *dstp++ = (*src1p++ & ~(*src2p++)) | *src3p++;
 }
 
 
 static int
-abitset_andn_or_cmp (dst, src1, src2, src3)
-     bitset dst;
-     bitset src1;
-     bitset src2;
-     bitset src3;
+abitset_andn_or_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
 {
-  unsigned int i;
+  bitset_windex i;
   int changed = 0;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *src3p = ABITSET_WORDS (src3);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
-  
+
   for (i = 0; i < size; i++, dstp++)
     {
       bitset_word tmp = (*src1p++ & ~(*src2p++)) | *src3p++;
-      
+
       if (*dstp != tmp)
 	{
 	  changed = 1;
@@ -751,43 +656,35 @@ abitset_andn_or_cmp (dst, src1, src2, src3)
 
 
 static void
-abitset_or_and (dst, src1, src2, src3)
-     bitset dst;
-     bitset src1;
-     bitset src2;
-     bitset src3;
+abitset_or_and (bitset dst, bitset src1, bitset src2, bitset src3)
 {
-  unsigned int i;
+  bitset_windex i;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *src3p = ABITSET_WORDS (src3);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
-  
+
   for (i = 0; i < size; i++)
       *dstp++ = (*src1p++ | *src2p++) & *src3p++;
 }
 
 
 static int
-abitset_or_and_cmp (dst, src1, src2, src3)
-     bitset dst;
-     bitset src1;
-     bitset src2;
-     bitset src3;
+abitset_or_and_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
 {
-  unsigned int i;
+  bitset_windex i;
   int changed = 0;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *src3p = ABITSET_WORDS (src3);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
-  
+
   for (i = 0; i < size; i++, dstp++)
     {
       bitset_word tmp = (*src1p++ | *src2p++) & *src3p++;
-      
+
       if (*dstp != tmp)
 	{
 	  changed = 1;
@@ -798,10 +695,8 @@ abitset_or_and_cmp (dst, src1, src2, src3)
 }
 
 
-void
-abitset_copy (dst, src)
-     bitset dst;
-     bitset src;
+static void
+abitset_copy (bitset dst, bitset src)
 {
   if (BITSET_COMPATIBLE_ (dst, src))
       abitset_copy1 (dst, src);
@@ -884,22 +779,32 @@ struct bitset_vtable abitset_vtable = {
 };
 
 
-int
-abitset_bytes (n_bits)
-     bitset_bindex n_bits;
+size_t
+abitset_bytes (bitset_bindex n_bits)
 {
-  unsigned int bytes, size;
+  bitset_windex size;
+  size_t bytes;
+  size_t header_size = offsetof (union bitset_union, a.words);
+  struct bitset_align_struct { char a; union bitset_union b; };
+  size_t bitset_alignment = offsetof (struct bitset_align_struct, b);
 
   size = ABITSET_N_WORDS (n_bits);
-  bytes = size * sizeof (bitset_word);
-  return sizeof (struct bitset_struct) + bytes - sizeof (bitset_word);
+  bytes = header_size + size * sizeof (bitset_word);
+
+  /* Align the size properly for a vector of abitset objects.  */
+  if (header_size % bitset_alignment != 0
+      || sizeof (bitset_word) % bitset_alignment != 0)
+    {
+      bytes += bitset_alignment - 1;
+      bytes -= bytes % bitset_alignment;
+    }
+
+  return bytes;
 }
 
 
 bitset
-abitset_init (bset, n_bits)
-     bitset bset;
-     bitset_bindex n_bits;
+abitset_init (bitset bset, bitset_bindex n_bits)
 {
   bitset_windex size;