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Import of 2003-06-08 libbitset <http://mail.gnu.org/archive/html/bison-patches/2003-06/msg00005.html>

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This commit is contained in:
Paul Eggert
2003-06-05 10:40:45 +00:00
parent 711f40b715
commit 25e845d1be
2 changed files with 40 additions and 63 deletions
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43
lib/bbitset.h
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@@ -19,23 +19,30 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef _BBITSET_H
#define _BBITSET_H
#include "config.h"
#include "libiberty.h"
#include <stdbool.h>
#include <limits.h>
#include <sys/types.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
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 array of bits
BITSET_TABLE: Expandable table of pointers to arrays of bits
(variable size, less storage for large sparse sets).
BITSET_STATS: Wrapper bitset for internal use only.
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[];
@@ -78,10 +85,11 @@ enum bitset_ops {BITSET_OP_ZERO, BITSET_OP_ONES,
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.
@@ -93,6 +101,14 @@ struct bbitset_struct
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
{
@@ -100,6 +116,7 @@ struct bitset_vtable
void (*reset) PARAMS ((bitset, bitset_bindex));
bool (*toggle) PARAMS ((bitset, bitset_bindex));
bool (*test) PARAMS ((bitset, bitset_bindex));
bitset_bindex (*resize) PARAMS ((bitset, bitset_bindex));
bitset_bindex (*size) PARAMS ((bitset));
bitset_bindex (*count) PARAMS ((bitset));
@@ -138,7 +155,8 @@ struct bitset_vtable
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 ();
@@ -152,6 +170,9 @@ 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)
@@ -264,6 +285,8 @@ extern bool bitset_toggle_ PARAMS ((bitset, bitset_bindex));
extern bitset_bindex bitset_count_ PARAMS ((bitset));
extern bitset_bindex bitset_size_ PARAMS ((bitset));
extern bool bitset_copy_ PARAMS ((bitset, bitset));
extern void bitset_and_or_ PARAMS ((bitset, bitset, bitset, bitset));