X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6aa452a643c65a8df244013e05d41854531ec762..22b081deb7ab1d0ec7a279e5213fa7fdc2c85207:/lib/lbitset.c?ds=inline diff --git a/lib/lbitset.c b/lib/lbitset.c index 5ce9e903..ef7e216d 100644 --- a/lib/lbitset.c +++ b/lib/lbitset.c @@ -1,10 +1,12 @@ /* Functions to support link list bitsets. - 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 + 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 + 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, @@ -13,18 +15,17 @@ 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. -*/ + along with this program. If not, see . */ -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif +#include #include "lbitset.h" + #include "obstack.h" +#include #include #include +#include /* This file implements linked-list bitsets. These bitsets can be of arbitrary length and are more efficient than arrays of bits for @@ -39,7 +40,10 @@ /* Number of words to use for each element. The larger the value the greater the size of the cache and the shorter the time to find a given bit but the more memory wasted for sparse bitsets and the longer the time - to search for set bits. */ + to search for set bits. + + The routines that dominate timing profiles are lbitset_elt_find + and lbitset_elt_link, especially when accessing the bits randomly. */ #define LBITSET_ELT_WORDS 2 @@ -49,39 +53,20 @@ typedef bitset_word lbitset_word; /* Number of bits stored in each element. */ #define LBITSET_ELT_BITS \ - ((unsigned) (LBITSET_ELT_WORDS * LBITSET_WORD_BITS)) + ((unsigned int) (LBITSET_ELT_WORDS * LBITSET_WORD_BITS)) /* Lbitset element. We use an array of bits for each element. These are linked together in a doubly-linked list. */ typedef struct lbitset_elt_struct { - struct lbitset_elt_struct *next; /* Next element. */ - struct lbitset_elt_struct *prev; /* Previous element. */ - bitset_windex index; /* bitno / BITSET_WORD_BITS. */ - bitset_word words[LBITSET_ELT_WORDS]; /* Bits that are set. */ + struct lbitset_elt_struct *next; /* Next element. */ + struct lbitset_elt_struct *prev; /* Previous element. */ + bitset_windex index; /* bitno / BITSET_WORD_BITS. */ + bitset_word words[LBITSET_ELT_WORDS]; /* Bits that are set. */ } lbitset_elt; -/* Head of lbitset linked list. */ -typedef struct lbitset_struct -{ - lbitset_elt *head; /* First element in linked list. */ - lbitset_elt *tail; /* Last element in linked list. */ -} -*lbitset; - - -struct bitset_struct -{ - struct bbitset_struct b; - struct lbitset_struct l; -}; - - -typedef void(*PFV)(); - - enum lbitset_find_mode { LBITSET_FIND, LBITSET_CREATE, LBITSET_SUBST }; @@ -89,37 +74,13 @@ static lbitset_elt lbitset_zero_elts[3]; /* Elements of all zero bits. */ /* Obstack to allocate bitset elements from. */ static struct obstack lbitset_obstack; -static int lbitset_obstack_init = 0; -static lbitset_elt *lbitset_free_list; /* Free list of bitset elements. */ - -static lbitset_elt *lbitset_elt_alloc PARAMS ((void)); -static lbitset_elt *lbitset_elt_calloc PARAMS ((void)); -static void lbitset_elt_link PARAMS ((bitset, lbitset_elt *)); -static void lbitset_elt_unlink PARAMS ((bitset, lbitset_elt *)); -static void lbitset_elt_free PARAMS ((lbitset_elt *)); -static lbitset_elt *lbitset_elt_find PARAMS ((bitset, bitset_windex, - enum lbitset_find_mode)); -static int lbitset_elt_zero_p PARAMS ((lbitset_elt *)); - -static void lbitset_prune PARAMS ((bitset, lbitset_elt *)); -static void lbitset_weed PARAMS ((bitset)); -static void lbitset_zero PARAMS ((bitset)); -static int lbitset_equal_p PARAMS ((bitset, bitset)); -static void lbitset_copy PARAMS ((bitset, bitset)); -static int lbitset_copy_cmp PARAMS ((bitset, bitset)); -static void lbitset_set PARAMS ((bitset, bitset_bindex)); -static void lbitset_reset PARAMS ((bitset, bitset_bindex)); -static int lbitset_test PARAMS ((bitset, bitset_bindex)); -static int lbitset_size PARAMS ((bitset)); -static int lbitset_op3_cmp PARAMS ((bitset, bitset, bitset, enum bitset_ops)); -static int lbitset_list PARAMS ((bitset, bitset_bindex *, bitset_bindex, - bitset_bindex *)); -static int lbitset_list_reverse -PARAMS ((bitset, bitset_bindex *, bitset_bindex, bitset_bindex *)); -static void lbitset_free PARAMS ((bitset)); - - -#define LBITSET_CURRENT1(X) (lbitset_elt *)((char *)(X) + ((char *)&(((lbitset_elt *)(X))->next) - (char *)&(((lbitset_elt *)(X))->words))) +static bool lbitset_obstack_init = false; +static lbitset_elt *lbitset_free_list; /* Free list of bitset elements. */ + +extern void debug_lbitset (bitset); + +#define LBITSET_CURRENT1(X) \ + ((lbitset_elt *) (void *) ((char *) (X) - offsetof (lbitset_elt, words))) #define LBITSET_CURRENT(X) LBITSET_CURRENT1((X)->b.cdata) @@ -128,7 +89,7 @@ static void lbitset_free PARAMS ((bitset)); /* Allocate a lbitset element. The bits are not cleared. */ static inline lbitset_elt * -lbitset_elt_alloc () +lbitset_elt_alloc (void) { lbitset_elt *elt; @@ -140,16 +101,16 @@ lbitset_elt_alloc () else { if (!lbitset_obstack_init) - { - lbitset_obstack_init = 1; + { + lbitset_obstack_init = true; - /* Let particular systems override the size of a chunk. */ + /* Let particular systems override the size of a chunk. */ #ifndef OBSTACK_CHUNK_SIZE #define OBSTACK_CHUNK_SIZE 0 #endif - /* Let them override the alloc and free routines too. */ + /* Let them override the alloc and free routines too. */ #ifndef OBSTACK_CHUNK_ALLOC #define OBSTACK_CHUNK_ALLOC xmalloc @@ -159,22 +120,20 @@ lbitset_elt_alloc () #define OBSTACK_CHUNK_FREE free #endif -#if !defined(__GNUC__) || (__GNUC__ < 2) +#if ! defined __GNUC__ || __GNUC__ < 2 #define __alignof__(type) 0 #endif - obstack_specify_allocation (&lbitset_obstack, OBSTACK_CHUNK_SIZE, - __alignof__ (lbitset_elt), - (void *(*)PARAMS ((long))) - OBSTACK_CHUNK_ALLOC, - (void (*)PARAMS ((void *))) - OBSTACK_CHUNK_FREE); - } + obstack_specify_allocation (&lbitset_obstack, OBSTACK_CHUNK_SIZE, + __alignof__ (lbitset_elt), + OBSTACK_CHUNK_ALLOC, + OBSTACK_CHUNK_FREE); + } /* Perhaps we should add a number of new elements to the free - list. */ + list. */ elt = (lbitset_elt *) obstack_alloc (&lbitset_obstack, - sizeof (lbitset_elt)); + sizeof (lbitset_elt)); } return elt; @@ -183,7 +142,7 @@ lbitset_elt_alloc () /* Allocate a lbitset element. The bits are cleared. */ static inline lbitset_elt * -lbitset_elt_calloc () +lbitset_elt_calloc (void) { lbitset_elt *elt; @@ -194,8 +153,7 @@ lbitset_elt_calloc () static inline void -lbitset_elt_free (elt) - lbitset_elt *elt; +lbitset_elt_free (lbitset_elt *elt) { elt->next = lbitset_free_list; lbitset_free_list = elt; @@ -204,9 +162,7 @@ lbitset_elt_free (elt) /* Unlink element ELT from bitset BSET. */ static inline void -lbitset_elt_unlink (bset, elt) - bitset bset; - lbitset_elt *elt; +lbitset_elt_unlink (bitset bset, lbitset_elt *elt) { lbitset_elt *next = elt->next; lbitset_elt *prev = elt->prev; @@ -228,20 +184,20 @@ lbitset_elt_unlink (bset, elt) if (LBITSET_CURRENT (bset) == elt) { if (next) - { - bset->b.cdata = next->words; - bset->b.cindex = next->index; - } + { + bset->b.cdata = next->words; + bset->b.cindex = next->index; + } else if (prev) - { - bset->b.cdata = prev->words; - bset->b.cindex = prev->index; - } + { + bset->b.cdata = prev->words; + bset->b.cindex = prev->index; + } else - { - bset->b.csize = 0; - bset->b.cdata = 0; - } + { + bset->b.csize = 0; + bset->b.cdata = 0; + } } lbitset_elt_free (elt); @@ -251,9 +207,7 @@ lbitset_elt_unlink (bset, elt) /* Cut the chain of bitset BSET before element ELT and free the elements. */ static inline void -lbitset_prune (bset, elt) - bitset bset; - lbitset_elt *elt; +lbitset_prune (bitset bset, lbitset_elt *elt) { lbitset_elt *next; @@ -283,26 +237,23 @@ lbitset_prune (bset, elt) } -/* Return nonzero if all bits in an element are zero. */ -static inline int -lbitset_elt_zero_p (elt) - lbitset_elt *elt; +/* Are all bits in an element zero? */ +static inline bool +lbitset_elt_zero_p (lbitset_elt *elt) { int i; for (i = 0; i < LBITSET_ELT_WORDS; i++) if (elt->words[i]) - return 0; + return false; - return 1; + return true; } /* Link the bitset element into the current bitset linked list. */ static inline void -lbitset_elt_link (bset, elt) - bitset bset; - lbitset_elt *elt; +lbitset_elt_link (bitset bset, lbitset_elt *elt) { bitset_windex windex = elt->index; lbitset_elt *ptr; @@ -326,13 +277,13 @@ lbitset_elt_link (bset, elt) else if (windex < bset->b.cindex) { for (ptr = current; - ptr->prev && ptr->prev->index > windex; ptr = ptr->prev) - continue; + ptr->prev && ptr->prev->index > windex; ptr = ptr->prev) + continue; if (ptr->prev) - ptr->prev->next = elt; + ptr->prev->next = elt; else - LBITSET_HEAD (bset) = elt; + LBITSET_HEAD (bset) = elt; elt->prev = ptr->prev; elt->next = ptr; @@ -343,13 +294,13 @@ lbitset_elt_link (bset, elt) else { for (ptr = current; - ptr->next && ptr->next->index < windex; ptr = ptr->next) - continue; + ptr->next && ptr->next->index < windex; ptr = ptr->next) + continue; if (ptr->next) - ptr->next->prev = elt; + ptr->next->prev = elt; else - LBITSET_TAIL (bset) = elt; + LBITSET_TAIL (bset) = elt; elt->next = ptr->next; elt->prev = ptr; @@ -364,10 +315,8 @@ lbitset_elt_link (bset, elt) static lbitset_elt * -lbitset_elt_find (bset, windex, mode) - bitset bset; - bitset_windex windex; - enum lbitset_find_mode mode; +lbitset_elt_find (bitset bset, bitset_windex windex, + enum lbitset_find_mode mode) { lbitset_elt *elt; lbitset_elt *current; @@ -377,7 +326,7 @@ lbitset_elt_find (bset, windex, mode) current = LBITSET_CURRENT (bset); /* Check if element is the cached element. */ if ((windex - bset->b.cindex) < bset->b.csize) - return current; + return current; } else { @@ -387,37 +336,40 @@ lbitset_elt_find (bset, windex, mode) if (current) { if (windex < bset->b.cindex) - { - for (elt = current; - elt->prev && elt->index > windex; elt = elt->prev) - continue; - } + { + for (elt = current; + elt->prev && elt->index > windex; elt = elt->prev) + continue; + } else - { - for (elt = current; - elt->next && (elt->index + LBITSET_ELT_WORDS - 1) < windex; - elt = elt->next) - continue; - } + { + for (elt = current; + elt->next && (elt->index + LBITSET_ELT_WORDS - 1) < windex; + elt = elt->next) + continue; + } /* ELT is the nearest to the one we want. If it's not the one - we want, the one we want does not exist. */ - if (elt && (windex - elt->index) < LBITSET_ELT_WORDS) - { - bset->b.cindex = elt->index; - bset->b.csize = LBITSET_ELT_WORDS; - bset->b.cdata = elt->words; - return elt; - } + we want, the one we want does not exist. */ + if (windex - elt->index < LBITSET_ELT_WORDS) + { + bset->b.cindex = elt->index; + bset->b.csize = LBITSET_ELT_WORDS; + bset->b.cdata = elt->words; + return elt; + } } switch (mode) { + default: + abort (); + case LBITSET_FIND: return 0; case LBITSET_CREATE: - windex = (windex / (unsigned) LBITSET_ELT_WORDS) * LBITSET_ELT_WORDS; + windex -= windex % LBITSET_ELT_WORDS; elt = lbitset_elt_calloc (); elt->index = windex; @@ -426,17 +378,13 @@ lbitset_elt_find (bset, windex, mode) case LBITSET_SUBST: return &lbitset_zero_elts[0]; - - default: - abort (); } } /* Weed out the zero elements from the list. */ static inline void -lbitset_weed (bset) - bitset bset; +lbitset_weed (bitset bset) { lbitset_elt *elt; lbitset_elt *next; @@ -445,15 +393,14 @@ lbitset_weed (bset) { next = elt->next; if (lbitset_elt_zero_p (elt)) - lbitset_elt_unlink (bset, elt); + lbitset_elt_unlink (bset, elt); } } /* Set all bits in the bitset to zero. */ static void -lbitset_zero (bset) - bitset bset; +lbitset_zero (bitset bset) { lbitset_elt *head; @@ -466,18 +413,16 @@ lbitset_zero (bset) } -/* Return 1 if DST == SRC. */ -static inline int -lbitset_equal_p (dst, src) - bitset dst; - bitset src; +/* Is DST == SRC? */ +static inline bool +lbitset_equal_p (bitset dst, bitset src) { lbitset_elt *selt; lbitset_elt *delt; int j; if (src == dst) - return 1; + return true; lbitset_weed (src); lbitset_weed (dst); @@ -485,11 +430,11 @@ lbitset_equal_p (dst, src) selt && delt; selt = selt->next, delt = delt->next) { if (selt->index != delt->index) - return 0; + return false; for (j = 0; j < LBITSET_ELT_WORDS; j++) - if (delt->words[j] != selt->words[j]) - return 0; + if (delt->words[j] != selt->words[j]) + return false; } return !selt && !delt; } @@ -497,9 +442,7 @@ lbitset_equal_p (dst, src) /* Copy bits from bitset SRC to bitset DST. */ static inline void -lbitset_copy (dst, src) - bitset dst; - bitset src; +lbitset_copy (bitset dst, bitset src) { lbitset_elt *elt; lbitset_elt *head; @@ -523,9 +466,9 @@ lbitset_copy (dst, src) tmp->prev = prev; tmp->next = 0; if (prev) - prev->next = tmp; + prev->next = tmp; else - LBITSET_HEAD (dst) = tmp; + LBITSET_HEAD (dst) = tmp; prev = tmp; memcpy (tmp->words, elt->words, sizeof (elt->words)); @@ -538,15 +481,13 @@ lbitset_copy (dst, src) } -/* Copy bits from bitset SRC to bitset DST. Return non-zero if +/* Copy bits from bitset SRC to bitset DST. Return true if bitsets different. */ -static inline int -lbitset_copy_cmp (dst, src) - bitset dst; - bitset src; +static inline bool +lbitset_copy_cmp (bitset dst, bitset src) { if (src == dst) - return 0; + return false; if (!LBITSET_HEAD (dst)) { @@ -555,34 +496,25 @@ lbitset_copy_cmp (dst, src) } if (lbitset_equal_p (dst, src)) - return 0; + return false; lbitset_copy (dst, src); - return 1; + return true; } -/* Return size in bits of bitset SRC. */ -static int -lbitset_size (src) - bitset src; +static bitset_bindex +lbitset_resize (bitset src, bitset_bindex size) { - lbitset_elt *elt; - - elt = LBITSET_TAIL (src); - if (!elt) - return 0; + BITSET_NBITS_ (src) = size; - /* Return current size of bitset in bits. */ - return (elt->index + LBITSET_ELT_WORDS) * BITSET_WORD_BITS; + /* Need to prune any excess bits. FIXME. */ + return size; } - /* Set bit BITNO in bitset DST. */ static void -lbitset_set (dst, bitno) - bitset dst; - bitset_bindex bitno; +lbitset_set (bitset dst, bitset_bindex bitno) { bitset_windex windex = bitno / BITSET_WORD_BITS; @@ -595,9 +527,7 @@ lbitset_set (dst, bitno) /* Reset bit BITNO in bitset DST. */ static void -lbitset_reset (dst, bitno) - bitset dst; - bitset_bindex bitno; +lbitset_reset (bitset dst, bitset_bindex bitno) { bitset_windex windex = bitno / BITSET_WORD_BITS; @@ -612,24 +542,20 @@ lbitset_reset (dst, bitno) /* Test bit BITNO in bitset SRC. */ -static int -lbitset_test (src, bitno) - bitset src; - bitset_bindex bitno; +static bool +lbitset_test (bitset src, bitset_bindex bitno) { bitset_windex windex = bitno / BITSET_WORD_BITS; - if (!lbitset_elt_find (src, windex, LBITSET_FIND)) - return 0; - - return (src->b.cdata[windex - src->b.cindex] - >> (bitno % BITSET_WORD_BITS)) & 1; + return (lbitset_elt_find (src, windex, LBITSET_FIND) + && ((src->b.cdata[windex - src->b.cindex] + >> (bitno % BITSET_WORD_BITS)) + & 1)); } static void -lbitset_free (bset) - bitset bset; +lbitset_free (bitset bset) { lbitset_zero (bset); } @@ -638,12 +564,9 @@ lbitset_free (bset) /* 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 -lbitset_list_reverse (bset, list, num, next) - bitset bset; - bitset_bindex *list; - bitset_bindex num; - bitset_bindex *next; +static bitset_bindex +lbitset_list_reverse (bitset bset, bitset_bindex *list, + bitset_bindex num, bitset_bindex *next) { bitset_bindex rbitno; bitset_bindex bitno; @@ -679,7 +602,7 @@ lbitset_list_reverse (bset, list, num, next) if (windex >= elt->index + LBITSET_ELT_WORDS) { /* We are trying to start in no-mans land so start - at end of current elt. */ + at end of current elt. */ bcount = BITSET_WORD_BITS - 1; windex = elt->index + LBITSET_ELT_WORDS - 1; } @@ -699,33 +622,33 @@ lbitset_list_reverse (bset, list, num, next) bitset_word *srcp = elt->words; for (; (windex - elt->index) < LBITSET_ELT_WORDS; - windex--, boffset -= BITSET_WORD_BITS, - bcount = BITSET_WORD_BITS - 1) - { - word = - srcp[windex - elt->index] << (BITSET_WORD_BITS - 1 - bcount); - - for (; word; bcount--) - { - if (word & BITSET_MSB) - { - list[count++] = boffset + bcount; - if (count >= num) - { - *next = n_bits - (boffset + bcount); - return count; - } - } - word <<= 1; - } - } + windex--, boffset -= BITSET_WORD_BITS, + bcount = BITSET_WORD_BITS - 1) + { + word = + srcp[windex - elt->index] << (BITSET_WORD_BITS - 1 - bcount); + + for (; word; bcount--) + { + if (word & BITSET_MSB) + { + list[count++] = boffset + bcount; + if (count >= num) + { + *next = n_bits - (boffset + bcount); + return count; + } + } + word <<= 1; + } + } elt = elt->prev; if (elt) - { - windex = elt->index + LBITSET_ELT_WORDS - 1; - boffset = windex * BITSET_WORD_BITS; - } + { + windex = elt->index + LBITSET_ELT_WORDS - 1; + boffset = windex * BITSET_WORD_BITS; + } } *next = n_bits - (boffset + 1); @@ -736,12 +659,9 @@ lbitset_list_reverse (bset, 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 -lbitset_list (bset, list, num, next) - bitset bset; - bitset_bindex *list; - bitset_bindex num; - bitset_bindex *next; +static bitset_bindex +lbitset_list (bitset bset, bitset_bindex *list, + bitset_bindex num, bitset_bindex *next) { bitset_bindex bitno; bitset_windex windex; @@ -772,51 +692,51 @@ lbitset_list (bset, list, num, next) /* Skip to starting element. */ for (elt = head; - elt && (elt->index + LBITSET_ELT_WORDS - 1) < windex; - elt = elt->next) - continue; + elt && (elt->index + LBITSET_ELT_WORDS - 1) < windex; + elt = elt->next) + continue; if (!elt) - return 0; + return 0; if (windex < elt->index) - { - windex = elt->index; - bitno = windex * BITSET_WORD_BITS; - } + { + windex = elt->index; + bitno = windex * BITSET_WORD_BITS; + } else - { - bitset_word *srcp = elt->words; - - /* We are starting within an element. */ - - for (; (windex - elt->index) < LBITSET_ELT_WORDS; windex++) - { - word = srcp[windex - elt->index] >> (bitno % BITSET_WORD_BITS); - - for (; word; bitno++) - { - if (word & 1) - { - list[count++] = bitno; - if (count >= num) - { - *next = bitno + 1; - return count; - } - } - word >>= 1; - } - bitno = (windex + 1) * BITSET_WORD_BITS; - } - - elt = elt->next; - if (elt) - { - windex = elt->index; - bitno = windex * BITSET_WORD_BITS; - } - } + { + bitset_word *srcp = elt->words; + + /* We are starting within an element. */ + + for (; (windex - elt->index) < LBITSET_ELT_WORDS; windex++) + { + word = srcp[windex - elt->index] >> (bitno % BITSET_WORD_BITS); + + for (; word; bitno++) + { + if (word & 1) + { + list[count++] = bitno; + if (count >= num) + { + *next = bitno + 1; + return count; + } + } + word >>= 1; + } + bitno = (windex + 1) * BITSET_WORD_BITS; + } + + elt = elt->next; + if (elt) + { + windex = elt->index; + bitno = windex * BITSET_WORD_BITS; + } + } } @@ -829,109 +749,109 @@ lbitset_list (bset, list, num, next) bitset_word *srcp = elt->words; if ((count + LBITSET_ELT_BITS) < num) - { - /* The coast is clear, plant boot! */ + { + /* The coast is clear, plant boot! */ #if LBITSET_ELT_WORDS == 2 - word = srcp[0]; - if (word) - { - if (!(word & 0xffff)) - { - word >>= 16; - bitno += 16; - } - if (!(word & 0xff)) - { - word >>= 8; - bitno += 8; - } - for (; word; bitno++) - { - if (word & 1) - list[count++] = bitno; - word >>= 1; - } - } - windex++; - bitno = windex * BITSET_WORD_BITS; - - word = srcp[1]; - if (word) - { - if (!(word & 0xffff)) - { - word >>= 16; - bitno += 16; - } - for (; word; bitno++) - { - if (word & 1) - list[count++] = bitno; - word >>= 1; - } - } - windex++; - bitno = windex * BITSET_WORD_BITS; + word = srcp[0]; + if (word) + { + if (!(word & 0xffff)) + { + word >>= 16; + bitno += 16; + } + if (!(word & 0xff)) + { + word >>= 8; + bitno += 8; + } + for (; word; bitno++) + { + if (word & 1) + list[count++] = bitno; + word >>= 1; + } + } + windex++; + bitno = windex * BITSET_WORD_BITS; + + word = srcp[1]; + if (word) + { + if (!(word & 0xffff)) + { + word >>= 16; + bitno += 16; + } + for (; word; bitno++) + { + if (word & 1) + list[count++] = bitno; + word >>= 1; + } + } + windex++; + bitno = windex * BITSET_WORD_BITS; #else - for (i = 0; i < LBITSET_ELT_WORDS; i++) - { - word = srcp[i]; - if (word) - { - if (!(word & 0xffff)) - { - word >>= 16; - bitno += 16; - } - if (!(word & 0xff)) - { - word >>= 8; - bitno += 8; - } - for (; word; bitno++) - { - if (word & 1) - list[count++] = bitno; - word >>= 1; - } - } - windex++; - bitno = windex * BITSET_WORD_BITS; - } + for (i = 0; i < LBITSET_ELT_WORDS; i++) + { + word = srcp[i]; + if (word) + { + if (!(word & 0xffff)) + { + word >>= 16; + bitno += 16; + } + if (!(word & 0xff)) + { + word >>= 8; + bitno += 8; + } + for (; word; bitno++) + { + if (word & 1) + list[count++] = bitno; + word >>= 1; + } + } + windex++; + bitno = windex * BITSET_WORD_BITS; + } #endif - } + } else - { - /* Tread more carefully since we need to check - if array overflows. */ - - for (i = 0; i < LBITSET_ELT_WORDS; i++) - { - for (word = srcp[i]; word; bitno++) - { - if (word & 1) - { - list[count++] = bitno; - if (count >= num) - { - *next = bitno + 1; - return count; - } - } - word >>= 1; - } - windex++; - bitno = windex * BITSET_WORD_BITS; - } - } + { + /* Tread more carefully since we need to check + if array overflows. */ + + for (i = 0; i < LBITSET_ELT_WORDS; i++) + { + for (word = srcp[i]; word; bitno++) + { + if (word & 1) + { + list[count++] = bitno; + if (count >= num) + { + *next = bitno + 1; + return count; + } + } + word >>= 1; + } + windex++; + bitno = windex * BITSET_WORD_BITS; + } + } elt = elt->next; if (elt) - { - windex = elt->index; - bitno = windex * BITSET_WORD_BITS; - } + { + windex = elt->index; + bitno = windex * BITSET_WORD_BITS; + } } *next = bitno; @@ -939,22 +859,58 @@ lbitset_list (bset, list, num, next) } -static int -lbitset_empty_p (dst) - bitset dst; +static bool +lbitset_empty_p (bitset dst) { - lbitset_weed (dst); - if (LBITSET_HEAD (dst)) - return 0; + lbitset_elt *elt; + lbitset_elt *next; + + for (elt = LBITSET_HEAD (dst); elt; elt = next) + { + next = elt->next; + if (!lbitset_elt_zero_p (elt)) + return 0; + /* Weed as we go. */ + lbitset_elt_unlink (dst, elt); + } + return 1; } +/* Ensure that any unused bits within the last element are clear. */ +static inline void +lbitset_unused_clear (bitset dst) +{ + unsigned int last_bit; + bitset_bindex n_bits; + + n_bits = BITSET_SIZE_ (dst); + last_bit = n_bits % LBITSET_ELT_BITS; + + if (last_bit) + { + lbitset_elt *elt; + bitset_windex windex; + bitset_word *srcp; + + elt = LBITSET_TAIL (dst); + srcp = elt->words; + windex = n_bits / BITSET_WORD_BITS; + + srcp[windex - elt->index] &= ((bitset_word) 1 << last_bit) - 1; + windex++; + + for (; (windex - elt->index) < LBITSET_ELT_WORDS; windex++) + srcp[windex - elt->index] = 0; + } +} + + static void -lbitset_ones (dst) - bitset dst; +lbitset_ones (bitset dst) { - unsigned int i; + bitset_windex i; bitset_windex windex; lbitset_elt *elt; @@ -962,61 +918,50 @@ lbitset_ones (dst) bitset! It makes a sparse bitset become dense. An alternative is to have a flag that indicates that the bitset stores the complement of what it indicates. */ - elt = LBITSET_TAIL (dst); - /* Ignore empty set. */ - if (!elt) - return; - - windex = elt->index; + + windex = (BITSET_SIZE_ (dst) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS; + for (i = 0; i < windex; i += LBITSET_ELT_WORDS) { /* Create new elements if they cannot be found. */ elt = lbitset_elt_find (dst, i, LBITSET_CREATE); memset (elt->words, -1, sizeof (elt->words)); } + + lbitset_unused_clear (dst); } static void -lbitset_not (dst, src) - bitset dst; - bitset src; +lbitset_not (bitset dst, bitset src) { - lbitset_elt *elt; lbitset_elt *selt; lbitset_elt *delt; - unsigned int i; + bitset_windex i; unsigned int j; bitset_windex windex; - /* This is another unfriendly operation for a linked list - bitset! */ - elt = LBITSET_TAIL (dst); - /* Ignore empty set. */ - if (!elt) - return; - - windex = elt->index; + windex = (BITSET_SIZE_ (dst) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS; + for (i = 0; i < windex; i += LBITSET_ELT_WORDS) { /* Create new elements for dst if they cannot be found - or substitute zero elements if src elements not found. */ + or substitute zero elements if src elements not found. */ selt = lbitset_elt_find (src, i, LBITSET_SUBST); delt = lbitset_elt_find (dst, i, LBITSET_CREATE); - + for (j = 0; j < LBITSET_ELT_WORDS; j++) - delt->words[j] = ~selt->words[j]; + delt->words[j] = ~selt->words[j]; } + lbitset_unused_clear (dst); lbitset_weed (dst); return; } -/* Return 1 if DST == DST | SRC. */ -static int -lbitset_subset_p (dst, src) - bitset dst; - bitset src; +/* Is DST == DST | SRC? */ +static bool +lbitset_subset_p (bitset dst, bitset src) { lbitset_elt *selt; lbitset_elt *delt; @@ -1026,36 +971,34 @@ lbitset_subset_p (dst, src) selt || delt; selt = selt->next, delt = delt->next) { if (!selt) - selt = &lbitset_zero_elts[0]; + selt = &lbitset_zero_elts[0]; else if (!delt) - delt = &lbitset_zero_elts[0]; + delt = &lbitset_zero_elts[0]; else if (selt->index != delt->index) - { - if (selt->index < delt->index) - { - lbitset_zero_elts[2].next = delt; - delt = &lbitset_zero_elts[2]; - } - else - { - lbitset_zero_elts[1].next = selt; - selt = &lbitset_zero_elts[1]; - } - } - + { + if (selt->index < delt->index) + { + lbitset_zero_elts[2].next = delt; + delt = &lbitset_zero_elts[2]; + } + else + { + lbitset_zero_elts[1].next = selt; + selt = &lbitset_zero_elts[1]; + } + } + for (j = 0; j < LBITSET_ELT_WORDS; j++) - if (delt->words[j] != (selt->words[j] | delt->words[j])) - return 0; + if (delt->words[j] != (selt->words[j] | delt->words[j])) + return false; } - return 1; + return true; } -/* Return 1 if DST & SRC == 0. */ -static int -lbitset_disjoint_p (dst, src) - bitset dst; - bitset src; +/* Is DST & SRC == 0? */ +static bool +lbitset_disjoint_p (bitset dst, bitset src) { lbitset_elt *selt; lbitset_elt *delt; @@ -1065,36 +1008,32 @@ lbitset_disjoint_p (dst, src) selt && delt; selt = selt->next, delt = delt->next) { if (selt->index != delt->index) - { - if (selt->index < delt->index) - { - lbitset_zero_elts[2].next = delt; - delt = &lbitset_zero_elts[2]; - } - else - { - lbitset_zero_elts[1].next = selt; - selt = &lbitset_zero_elts[1]; - } - /* Since the elements are different, there is no - intersection of these elements. */ - continue; - } - + { + if (selt->index < delt->index) + { + lbitset_zero_elts[2].next = delt; + delt = &lbitset_zero_elts[2]; + } + else + { + lbitset_zero_elts[1].next = selt; + selt = &lbitset_zero_elts[1]; + } + /* Since the elements are different, there is no + intersection of these elements. */ + continue; + } + for (j = 0; j < LBITSET_ELT_WORDS; j++) - if (selt->words[j] & delt->words[j]) - return 0; + if (selt->words[j] & delt->words[j]) + return false; } - return 1; + return true; } -static int -lbitset_op3_cmp (dst, src1, src2, op) - bitset dst; - bitset src1; - bitset src2; - enum bitset_ops op; +static bool +lbitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op) { lbitset_elt *selt1 = LBITSET_HEAD (src1); lbitset_elt *selt2 = LBITSET_HEAD (src2); @@ -1108,142 +1047,142 @@ lbitset_op3_cmp (dst, src1, src2, op) bitset_word *srcp1; bitset_word *srcp2; bitset_word *dstp; - int changed = 0; + bool changed = false; unsigned int i; LBITSET_HEAD (dst) = 0; dst->b.csize = 0; - windex1 = (selt1) ? selt1->index : BITSET_INDEX_MAX; - windex2 = (selt2) ? selt2->index : BITSET_INDEX_MAX; + windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX; + windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX; while (selt1 || selt2) { /* Figure out whether we need to substitute zero elements for - missing links. */ + missing links. */ if (windex1 == windex2) - { - windex = windex1; - stmp1 = selt1; - stmp2 = selt2; - selt1 = selt1->next; - windex1 = (selt1) ? selt1->index : BITSET_INDEX_MAX; - selt2 = selt2->next; - windex2 = (selt2) ? selt2->index : BITSET_INDEX_MAX; - } + { + windex = windex1; + stmp1 = selt1; + stmp2 = selt2; + selt1 = selt1->next; + windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX; + selt2 = selt2->next; + windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX; + } else if (windex1 < windex2) - { - windex = windex1; - stmp1 = selt1; - stmp2 = &lbitset_zero_elts[0]; - selt1 = selt1->next; - windex1 = (selt1) ? selt1->index : BITSET_INDEX_MAX; - } + { + windex = windex1; + stmp1 = selt1; + stmp2 = &lbitset_zero_elts[0]; + selt1 = selt1->next; + windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX; + } else - { - windex = windex2; - stmp1 = &lbitset_zero_elts[0]; - stmp2 = selt2; - selt2 = selt2->next; - windex2 = (selt2) ? selt2->index : BITSET_INDEX_MAX; - } + { + windex = windex2; + stmp1 = &lbitset_zero_elts[0]; + stmp2 = selt2; + selt2 = selt2->next; + windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX; + } /* Find the appropriate element from DST. Begin by discarding - elements that we've skipped. */ + elements that we've skipped. */ while (delt && delt->index < windex) - { - changed = 1; - dtmp = delt; - delt = delt->next; - lbitset_elt_free (dtmp); - } + { + changed = true; + dtmp = delt; + delt = delt->next; + lbitset_elt_free (dtmp); + } if (delt && delt->index == windex) - { - dtmp = delt; - delt = delt->next; - } + { + dtmp = delt; + delt = delt->next; + } else - dtmp = lbitset_elt_calloc (); + dtmp = lbitset_elt_calloc (); /* Do the operation, and if any bits are set, link it into the - linked list. */ + linked list. */ srcp1 = stmp1->words; srcp2 = stmp2->words; dstp = dtmp->words; switch (op) - { - case BITSET_OP_OR: - for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++) - { - bitset_word tmp = *srcp1++ | *srcp2++; - - if (*dstp != tmp) - { - changed = 1; - *dstp = tmp; - } - } - break; - - case BITSET_OP_AND: - for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++) - { - bitset_word tmp = *srcp1++ & *srcp2++; - - if (*dstp != tmp) - { - changed = 1; - *dstp = tmp; - } - } - break; - - case BITSET_OP_XOR: - for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++) - { - bitset_word tmp = *srcp1++ ^ *srcp2++; - - if (*dstp != tmp) - { - changed = 1; - *dstp = tmp; - } - } - break; - - case BITSET_OP_ANDN: - for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++) - { - bitset_word tmp = *srcp1++ & ~(*srcp2++); - - if (*dstp != tmp) - { - changed = 1; - *dstp = tmp; - } - } - break; - - default: - abort (); - } + { + default: + abort (); + + case BITSET_OP_OR: + for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++) + { + bitset_word tmp = *srcp1++ | *srcp2++; + + if (*dstp != tmp) + { + changed = true; + *dstp = tmp; + } + } + break; + + case BITSET_OP_AND: + for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++) + { + bitset_word tmp = *srcp1++ & *srcp2++; + + if (*dstp != tmp) + { + changed = true; + *dstp = tmp; + } + } + break; + + case BITSET_OP_XOR: + for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++) + { + bitset_word tmp = *srcp1++ ^ *srcp2++; + + if (*dstp != tmp) + { + changed = true; + *dstp = tmp; + } + } + break; + + case BITSET_OP_ANDN: + for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++) + { + bitset_word tmp = *srcp1++ & ~(*srcp2++); + + if (*dstp != tmp) + { + changed = true; + *dstp = tmp; + } + } + break; + } if (!lbitset_elt_zero_p (dtmp)) - { - dtmp->index = windex; - /* Perhaps this could be optimised... */ - lbitset_elt_link (dst, dtmp); - } + { + dtmp->index = windex; + /* Perhaps this could be optimised... */ + lbitset_elt_link (dst, dtmp); + } else - { - lbitset_elt_free (dtmp); - } + { + lbitset_elt_free (dtmp); + } } /* If we have elements of DST left over, free them all. */ if (delt) { - changed = 1; + changed = true; lbitset_prune (dst, delt); } @@ -1251,15 +1190,12 @@ lbitset_op3_cmp (dst, src1, src2, op) } -static int -lbitset_and_cmp (dst, src1, src2) - bitset dst; - bitset src1; - bitset src2; +static bool +lbitset_and_cmp (bitset dst, bitset src1, bitset src2) { lbitset_elt *selt1 = LBITSET_HEAD (src1); lbitset_elt *selt2 = LBITSET_HEAD (src2); - int changed; + bool changed; if (!selt2) { @@ -1279,15 +1215,19 @@ lbitset_and_cmp (dst, src1, src2) } -static int -lbitset_andn_cmp (dst, src1, src2) - bitset dst; - bitset src1; - bitset src2; +static void +lbitset_and (bitset dst, bitset src1, bitset src2) +{ + lbitset_and_cmp (dst, src1, src2); +} + + +static bool +lbitset_andn_cmp (bitset dst, bitset src1, bitset src2) { lbitset_elt *selt1 = LBITSET_HEAD (src1); lbitset_elt *selt2 = LBITSET_HEAD (src2); - int changed; + bool changed; if (!selt2) { @@ -1304,11 +1244,15 @@ lbitset_andn_cmp (dst, src1, src2) } -static int -lbitset_or_cmp (dst, src1, src2) - bitset dst; - bitset src1; - bitset src2; +static void +lbitset_andn (bitset dst, bitset src1, bitset src2) +{ + lbitset_andn_cmp (dst, src1, src2); +} + + +static bool +lbitset_or_cmp (bitset dst, bitset src1, bitset src2) { lbitset_elt *selt1 = LBITSET_HEAD (src1); lbitset_elt *selt2 = LBITSET_HEAD (src2); @@ -1325,11 +1269,15 @@ lbitset_or_cmp (dst, src1, src2) } -static int -lbitset_xor_cmp (dst, src1, src2) - bitset dst; - bitset src1; - bitset src2; +static void +lbitset_or (bitset dst, bitset src1, bitset src2) +{ + lbitset_or_cmp (dst, src1, src2); +} + + +static bool +lbitset_xor_cmp (bitset dst, bitset src1, bitset src2) { lbitset_elt *selt1 = LBITSET_HEAD (src1); lbitset_elt *selt2 = LBITSET_HEAD (src2); @@ -1346,6 +1294,13 @@ lbitset_xor_cmp (dst, src1, src2) } +static void +lbitset_xor (bitset dst, bitset src1, bitset src2) +{ + lbitset_xor_cmp (dst, src1, src2); +} + + /* Vector of operations for linked-list bitsets. */ struct bitset_vtable lbitset_vtable = { @@ -1353,7 +1308,8 @@ struct bitset_vtable lbitset_vtable = { lbitset_reset, bitset_toggle_, lbitset_test, - lbitset_size, + lbitset_resize, + bitset_size_, bitset_count_, lbitset_empty_p, lbitset_ones, @@ -1363,19 +1319,19 @@ struct bitset_vtable lbitset_vtable = { lbitset_equal_p, lbitset_not, lbitset_subset_p, - (PFV) lbitset_and_cmp, + lbitset_and, lbitset_and_cmp, - (PFV) lbitset_andn_cmp, + lbitset_andn, lbitset_andn_cmp, - (PFV) lbitset_or_cmp, + lbitset_or, lbitset_or_cmp, - (PFV) lbitset_xor_cmp, + lbitset_xor, lbitset_xor_cmp, - (PFV) bitset_and_or_cmp_, + bitset_and_or_, bitset_and_or_cmp_, - (PFV) bitset_andn_or_cmp_, + bitset_andn_or_, bitset_andn_or_cmp_, - (PFV) bitset_or_and_cmp_, + bitset_or_and_, bitset_or_and_cmp_, lbitset_list, lbitset_list_reverse, @@ -1385,32 +1341,30 @@ struct bitset_vtable lbitset_vtable = { /* Return size of initial structure. */ -int -lbitset_bytes (n_bits) - bitset_bindex n_bits ATTRIBUTE_UNUSED; +size_t +lbitset_bytes (bitset_bindex n_bits ATTRIBUTE_UNUSED) { - return sizeof (struct bitset_struct); + return sizeof (struct lbitset_struct); } /* Initialize a bitset. */ bitset -lbitset_init (bset, n_bits) - bitset bset; - bitset_bindex n_bits ATTRIBUTE_UNUSED; +lbitset_init (bitset bset, bitset_bindex n_bits ATTRIBUTE_UNUSED) { + BITSET_NBITS_ (bset) = n_bits; bset->b.vtable = &lbitset_vtable; return bset; } void -lbitset_release_memory () +lbitset_release_memory (void) { lbitset_free_list = 0; if (lbitset_obstack_init) { - lbitset_obstack_init = 0; + lbitset_obstack_init = false; obstack_free (&lbitset_obstack, NULL); } } @@ -1418,30 +1372,29 @@ lbitset_release_memory () /* Function to be called from debugger to debug lbitset. */ void -debug_lbitset (bset) - bitset bset; +debug_lbitset (bitset bset) { lbitset_elt *elt; unsigned int i; if (!bset) return; - + for (elt = LBITSET_HEAD (bset); elt; elt = elt->next) { - fprintf (stderr, "Elt %d\n", elt->index); + fprintf (stderr, "Elt %lu\n", (unsigned long int) elt->index); for (i = 0; i < LBITSET_ELT_WORDS; i++) - { - unsigned int j; - bitset_word word; - - word = elt->words[i]; - - fprintf (stderr, " Word %d:", i); - for (j = 0; j < LBITSET_WORD_BITS; j++) - if ((word & (1 << j))) - fprintf (stderr, " %d", j); - fprintf (stderr, "\n"); - } + { + unsigned int j; + bitset_word word; + + word = elt->words[i]; + + fprintf (stderr, " Word %u:", i); + for (j = 0; j < LBITSET_WORD_BITS; j++) + if ((word & ((bitset_word) 1 << j))) + fprintf (stderr, " %u", j); + fprintf (stderr, "\n"); + } } }