X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6aa452a643c65a8df244013e05d41854531ec762..7287be84f10886ea3c38ac86da1d6642822b671e:/lib/bbitset.h

diff --git a/lib/bbitset.h b/lib/bbitset.h
index 059c3e44..f819b17a 100644
--- a/lib/bbitset.h
+++ b/lib/bbitset.h
@@ -1,81 +1,96 @@
 /* Base bitset stuff.
-   Copyright (C) 2002 Free Software Foundation, Inc.
+
+   Copyright (C) 2002-2004, 2006, 2009-2012 Free Software Foundation,
+   Inc.
+
    Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz).
 
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
 
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
 
-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.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #ifndef _BBITSET_H
 #define _BBITSET_H
 
 #include "libiberty.h"
 
-#ifdef HAVE_LIMITS_H
+#include <stdbool.h>
 #include <limits.h>
-#endif
+#include <stddef.h>
 
-/* Currently we support three flavours of bitsets:
+/* Currently we support five flavours of bitsets:
    BITSET_ARRAY:  Array of bits (fixed size, fast for dense bitsets).
-   BITSET_LIST:   Linked list of array of bits (variable size, least storage
-                  for large very sparse sets). 
-   BITSET_TABLE:  Expandable table of pointers to array of bits 
-                  (variable size, less storage for large sparse sets). 
-
-   BITSET_STATS:  Wrapper bitset for internal use only.
+                  Memory for bit array and bitset structure allocated
+                  contiguously.
+   BITSET_LIST:   Linked list of arrays of bits (variable size, least storage
+		  for large very sparse sets).
+   BITSET_TABLE:  Expandable table of pointers to arrays of bits
+		  (variable size, less storage for large sparse sets).
+                  Faster than BITSET_LIST for random access.
+   BITSET_VARRAY: Variable array of bits (variable size, fast for
+                  dense bitsets).
+   BITSET_STATS:  Wrapper bitset for internal use only.  Used for gathering
+                  statistics and/or better run-time checking.
 */
-enum bitset_type {BITSET_ARRAY, BITSET_LIST, BITSET_TABLE, BITSET_TYPE_NUM,
-		  BITSET_STATS};
-#define BITSET_TYPE_NAMES {"abitset", "lbitset", "ebitset"}
+enum bitset_type {BITSET_ARRAY, BITSET_LIST, BITSET_TABLE, BITSET_VARRAY,
+		  BITSET_TYPE_NUM, BITSET_STATS};
+#define BITSET_TYPE_NAMES {"abitset", "lbitset", "ebitset", "vbitset"}
 
 extern const char * const bitset_type_names[];
 
 enum bitset_alloc_type {BITSET_MALLOC, BITSET_OBALLOC};
 
-/* Non-zero to use inline functions instead of macros.  */
-#define BITSET_INLINE 0
-
 /* Data type used to store a word of bits.  */
-typedef unsigned long bitset_word;
-#define BITSET_WORD_BITS ((unsigned) (CHAR_BIT * sizeof (bitset_word)))
+typedef unsigned long int bitset_word;
+#define BITSET_WORD_BITS ((unsigned int) (CHAR_BIT * sizeof (bitset_word)))
 
 /* Bit index.  In theory we might need a type wider than size_t, but
    in practice we lose at most a factor of CHAR_BIT by going with
-   size_t, and that is good enough.  */
+   size_t, and that is good enough.  If this type is changed to be
+   wider than size_t, the code needs to be modified to check for
+   overflow when converting bit counts to byte or word counts.
+   The bit and word index types must be unsigned.  */
 typedef size_t bitset_bindex;
 
 /* Word index.  */
 typedef size_t bitset_windex;
 
-#define BITSET_INDEX_MAX ((bitset_word) 1 << (BITSET_WORD_BITS - 1))
+/* Maximum values for commonly-used unsigned types.  BITSET_SIZE_MAX
+   always equals SIZE_MAX, but some older systems lack SIZE_MAX.  */
+#define BITSET_BINDEX_MAX ((bitset_bindex) -1)
+
+/* Limit max word index to the maximum value of a signed integer
+   to simplify cache disabling.  */
+#define BITSET_WINDEX_MAX (((bitset_windex) -1) >> 1)
+#define BITSET_SIZE_MAX ((size_t) -1)
 
 #define BITSET_MSB ((bitset_word) 1 << (BITSET_WORD_BITS - 1))
 
 #define BITSET_LIST_SIZE 1024
 
-enum bitset_ops {BITSET_OP_ZERO, BITSET_OP_ONES, 
-		 BITSET_OP_COPY, BITSET_OP_NOT, 
+enum bitset_ops {BITSET_OP_ZERO, BITSET_OP_ONES,
+		 BITSET_OP_COPY, BITSET_OP_NOT,
 		 BITSET_OP_EMPTY_P, BITSET_OP_EQUAL_P,
 		 BITSET_OP_SUBSET_P, BITSET_OP_DISJOINT_P,
-		 BITSET_OP_AND, BITSET_OP_OR, BITSET_OP_XOR, BITSET_OP_ANDN, 
+		 BITSET_OP_AND, BITSET_OP_OR, BITSET_OP_XOR, BITSET_OP_ANDN,
 		 BITSET_OP_OR_AND, BITSET_OP_AND_OR, BITSET_OP_ANDN_OR};
 
 struct bbitset_struct
 {
-  const struct bitset_vtable * vtable;
+  const struct bitset_vtable *vtable;
   bitset_windex cindex;		/* Cache word index.  */
   bitset_windex csize;		/* Cache size in words.  */
   bitset_word *cdata;		/* Cache data pointer.  */
+  bitset_bindex n_bits;		/* Number of bits.  */
   /* Perhaps we could sacrifice another word to indicate
      that the bitset is known to be zero, that a bit has been set
      in the cache, and that a bit has been cleared in the cache.
@@ -84,68 +99,64 @@ struct bbitset_struct
 };
 
 
-typedef struct bitset_struct *bitset;
+typedef union bitset_union *bitset;
+
+
+/* Private accessor macros to bitset structure.  */
+#define BITSET_VTABLE_(SRC) (SRC)->b.vtable
+#define BITSET_CINDEX_(SRC) (SRC)->b.cindex
+#define BITSET_CDATA_(SRC) (SRC)->b.cdata
+#define BITSET_CSIZE_(SRC) (SRC)->b.csize
+#define BITSET_NBITS_(SRC) (SRC)->b.n_bits
 
 
 /* The contents of this structure should be considered private.  */
 struct bitset_vtable
 {
-  void (*set) PARAMS ((struct bitset_struct *, bitset_bindex));
-  void (*reset) PARAMS ((struct bitset_struct *, bitset_bindex));
-  int (*toggle) PARAMS ((struct bitset_struct *, bitset_bindex));
-  int (*test) PARAMS ((struct bitset_struct *, bitset_bindex));
-  int (*size) PARAMS ((struct bitset_struct *));
-  int (*count) PARAMS ((struct bitset_struct *));
-
-  int (*empty_p) PARAMS ((struct bitset_struct *));
-  void (*ones) PARAMS ((struct bitset_struct *));
-  void (*zero) PARAMS ((struct bitset_struct *));
-
-  void (*copy) PARAMS ((struct bitset_struct *, struct bitset_struct *));
-  int (*disjoint_p) PARAMS ((struct bitset_struct *, struct bitset_struct *));
-  int (*equal_p) PARAMS ((struct bitset_struct *, struct bitset_struct *));
-  void (*not) PARAMS ((struct bitset_struct *, struct bitset_struct *));
-  int (*subset_p) PARAMS ((struct bitset_struct *, struct bitset_struct *));
-
-  void (*and) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-		       struct bitset_struct *));
-  int (*and_cmp) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			  struct bitset_struct *));
-  void (*andn) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-		       struct bitset_struct *));
-  int (*andn_cmp) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			   struct bitset_struct *));
-  void (*or) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-		      struct bitset_struct *));
-  int (*or_cmp) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			 struct bitset_struct *));
-  void (*xor) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-		      struct bitset_struct *));
-  int (*xor_cmp) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			  struct bitset_struct *));
-
-  void (*and_or) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			  struct bitset_struct *, struct bitset_struct *));
-  int (*and_or_cmp) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			 struct bitset_struct *, struct bitset_struct *));
-  void (*andn_or) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			  struct bitset_struct *, struct bitset_struct *));
-  int (*andn_or_cmp) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			      struct bitset_struct *, struct bitset_struct *));
-  void (*or_and) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			  struct bitset_struct *, struct bitset_struct *));
-  int (*or_and_cmp) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-			     struct bitset_struct *, struct bitset_struct *));
-
-  int (*list) PARAMS ((struct bitset_struct *, bitset_bindex *,
-		       bitset_bindex, bitset_bindex *));
-  int (*list_reverse) PARAMS ((struct bitset_struct *, bitset_bindex *,
-			       bitset_bindex, bitset_bindex *));
-  void (*free) PARAMS ((struct bitset_struct *));
+  void (*set) (bitset, bitset_bindex);
+  void (*reset) (bitset, bitset_bindex);
+  bool (*toggle) (bitset, bitset_bindex);
+  bool (*test) (bitset, bitset_bindex);
+  bitset_bindex (*resize) (bitset, bitset_bindex);
+  bitset_bindex (*size) (bitset);
+  bitset_bindex (*count) (bitset);
+
+  bool (*empty_p) (bitset);
+  void (*ones) (bitset);
+  void (*zero) (bitset);
+
+  void (*copy) (bitset, bitset);
+  bool (*disjoint_p) (bitset, bitset);
+  bool (*equal_p) (bitset, bitset);
+  void (*not_) (bitset, bitset);
+  bool (*subset_p) (bitset, bitset);
+
+  void (*and_) (bitset, bitset, bitset);
+  bool (*and_cmp) (bitset, bitset, bitset);
+  void (*andn) (bitset, bitset, bitset);
+  bool (*andn_cmp) (bitset, bitset, bitset);
+  void (*or_) (bitset, bitset, bitset);
+  bool (*or_cmp) (bitset, bitset, bitset);
+  void (*xor_) (bitset, bitset, bitset);
+  bool (*xor_cmp) (bitset, bitset, bitset);
+
+  void (*and_or) (bitset, bitset, bitset, bitset);
+  bool (*and_or_cmp) (bitset, bitset, bitset, bitset);
+  void (*andn_or) (bitset, bitset, bitset, bitset);
+  bool (*andn_or_cmp) (bitset, bitset, bitset, bitset);
+  void (*or_and) (bitset, bitset, bitset, bitset);
+  bool (*or_and_cmp) (bitset, bitset, bitset, bitset);
+
+  bitset_bindex (*list) (bitset, bitset_bindex *, bitset_bindex,
+			 bitset_bindex *);
+  bitset_bindex (*list_reverse) (bitset, bitset_bindex *, bitset_bindex,
+				 bitset_bindex *);
+  void (*free) (bitset);
   enum bitset_type type;
 };
 
-#define BITSET_COMPATIBLE_(BSET1, BSET2) ((BSET1)->b.vtable == (BSET2)->b.vtable)
+#define BITSET_COMPATIBLE_(BSET1, BSET2) \
+((BSET1)->b.vtable == (BSET2)->b.vtable)
 
 #define BITSET_CHECK2_(DST, SRC) \
 if (!BITSET_COMPATIBLE_ (DST, SRC)) abort ();
@@ -159,26 +170,29 @@ if (!BITSET_COMPATIBLE_ (DST, SRC1) || !BITSET_COMPATIBLE_ (DST, SRC2) \
     || !BITSET_COMPATIBLE_ (DST, SRC3)) abort ();
 
 
+/* Redefine number of bits in bitset DST.  */
+#define BITSET_RESIZE_(DST, SIZE) (DST)->b.vtable->resize (DST, SIZE)
+
 /* Return size in bits of bitset SRC.  */
-#define BITSET_SIZE_(SRC) (SRC)->b.vtable->size (SRC) 
+#define BITSET_SIZE_(SRC) (SRC)->b.vtable->size (SRC)
 
 /* Return number of bits set in bitset SRC.  */
-#define BITSET_COUNT_(SRC) (SRC)->b.vtable->count (SRC) 
+#define BITSET_COUNT_(SRC) (SRC)->b.vtable->count (SRC)
 
 /* Return type of bitset SRC.  */
-#define BITSET_TYPE_(DST) (DST)->b.vtable->type 
+#define BITSET_TYPE_(DST) (DST)->b.vtable->type
 
 /* Set bit BITNO in bitset DST.  */
-#define BITSET_SET_(DST, BITNO) (DST)->b.vtable->set (DST, BITNO) 
+#define BITSET_SET_(DST, BITNO) (DST)->b.vtable->set (DST, BITNO)
 
 /* Reset bit BITNO in bitset DST.  */
-#define BITSET_RESET_(DST, BITNO) (DST)->b.vtable->reset (DST, BITNO) 
+#define BITSET_RESET_(DST, BITNO) (DST)->b.vtable->reset (DST, BITNO)
 
 /* Toggle bit BITNO in bitset DST.  */
-#define BITSET_TOGGLE_(DST, BITNO) (DST)->b.vtable->toggle (DST, BITNO) 
+#define BITSET_TOGGLE_(DST, BITNO) (DST)->b.vtable->toggle (DST, BITNO)
 
 /* Return non-zero if bit BITNO in bitset SRC is set.  */
-#define BITSET_TEST_(SRC, BITNO) (SRC)->b.vtable->test (SRC, BITNO) 
+#define BITSET_TEST_(SRC, BITNO) (SRC)->b.vtable->test (SRC, BITNO)
 
 /* Free bitset SRC.  */
 #define BITSET_FREE_(SRC)\
@@ -206,14 +220,14 @@ if (!BITSET_COMPATIBLE_ (DST, SRC1) || !BITSET_COMPATIBLE_ (DST, SRC2) \
 #define BITSET_EQUAL_P_(DST, SRC) (SRC)->b.vtable->equal_p (DST, SRC)
 
 /* DST = ~SRC.  */
-#define BITSET_NOT_(DST, SRC) (SRC)->b.vtable->not (DST, SRC)
+#define BITSET_NOT_(DST, SRC) (SRC)->b.vtable->not_ (DST, SRC)
 
 /* Return DST == DST | SRC.  */
 #define BITSET_SUBSET_P_(DST, SRC) (SRC)->b.vtable->subset_p (DST, SRC)
 
 
 /* DST = SRC1 & SRC2.  */
-#define BITSET_AND_(DST, SRC1, SRC2) (SRC1)->b.vtable->and (DST, SRC1, SRC2)
+#define BITSET_AND_(DST, SRC1, SRC2) (SRC1)->b.vtable->and_ (DST, SRC1, SRC2)
 #define BITSET_AND_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->and_cmp (DST, SRC1, SRC2)
 
 /* DST = SRC1 & ~SRC2.  */
@@ -221,11 +235,11 @@ if (!BITSET_COMPATIBLE_ (DST, SRC1) || !BITSET_COMPATIBLE_ (DST, SRC2) \
 #define BITSET_ANDN_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->andn_cmp (DST, SRC1, SRC2)
 
 /* DST = SRC1 | SRC2.  */
-#define BITSET_OR_(DST, SRC1, SRC2) (SRC1)->b.vtable->or (DST, SRC1, SRC2)
+#define BITSET_OR_(DST, SRC1, SRC2) (SRC1)->b.vtable->or_ (DST, SRC1, SRC2)
 #define BITSET_OR_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->or_cmp (DST, SRC1, SRC2)
 
 /* DST = SRC1 ^ SRC2.  */
-#define BITSET_XOR_(DST, SRC1, SRC2) (SRC1)->b.vtable->xor (DST, SRC1, SRC2)
+#define BITSET_XOR_(DST, SRC1, SRC2) (SRC1)->b.vtable->xor_ (DST, SRC1, SRC2)
 #define BITSET_XOR_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->xor_cmp (DST, SRC1, SRC2)
 
 
@@ -252,31 +266,39 @@ if (!BITSET_COMPATIBLE_ (DST, SRC1) || !BITSET_COMPATIBLE_ (DST, SRC2) \
  (SRC1)->b.vtable->or_and_cmp (DST, SRC1, SRC2, SRC3)
 
 
-/* Find list of up to NUM bits set in BSET starting from and including 
+/* Find list of up to NUM bits set in BSET starting from and including
    *NEXT.  Return with actual number of bits found and with *NEXT
    indicating where search stopped.  */
 #define BITSET_LIST_(BSET, LIST, NUM, NEXT) \
- (BSET)->b.vtable->list (BSET, LIST, NUM, NEXT) 
+ (BSET)->b.vtable->list (BSET, LIST, NUM, NEXT)
 
 /* Find reverse list of up to NUM bits set in BSET starting from and
    including NEXT.  Return with actual number of bits found and with
    *NEXT indicating where search stopped.  */
 #define BITSET_LIST_REVERSE_(BSET, LIST, NUM, NEXT) \
- (BSET)->b.vtable->list_reverse (BSET, LIST, NUM, NEXT) 
+ (BSET)->b.vtable->list_reverse (BSET, LIST, NUM, NEXT)
 
 
 /* Private functions for bitset implementations.  */
- 
-extern int bitset_toggle_ PARAMS ((bitset, bitset_bindex));
 
-extern int bitset_count_ PARAMS ((bitset));
+extern bool bitset_toggle_ (bitset, bitset_bindex);
+
+extern bitset_bindex bitset_count_ (bitset);
+
+extern bitset_bindex bitset_size_ (bitset);
+
+extern bool bitset_copy_ (bitset, bitset);
+
+extern void bitset_and_or_ (bitset, bitset, bitset, bitset);
+
+extern bool bitset_and_or_cmp_ (bitset, bitset, bitset, bitset);
 
-extern int bitset_copy_ PARAMS ((bitset, bitset));
+extern void bitset_andn_or_ (bitset, bitset, bitset, bitset);
 
-extern int bitset_and_or_cmp_ PARAMS ((bitset, bitset, bitset, bitset));
+extern bool bitset_andn_or_cmp_ (bitset, bitset, bitset, bitset);
 
-extern int bitset_andn_or_cmp_ PARAMS ((bitset, bitset, bitset, bitset));
+extern void bitset_or_and_ (bitset, bitset, bitset, bitset);
 
-extern int bitset_or_and_cmp_ PARAMS ((bitset, bitset, bitset, bitset));
+extern bool bitset_or_and_cmp_ (bitset, bitset, bitset, bitset);
 
 #endif /* _BBITSET_H  */