803 lines
18 KiB
C
803 lines
18 KiB
C
/* Functions to support general ended bitmaps.
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Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "rtl.h"
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#include "flags.h"
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#include "obstack.h"
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#include "bitmap.h"
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/* Obstack to allocate bitmap elements from. */
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static struct obstack bitmap_obstack;
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static int bitmap_obstack_init = FALSE;
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#ifndef INLINE
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#ifndef __GNUC__
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#define INLINE
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#else
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#define INLINE __inline__
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#endif
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#endif
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/* Global data */
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bitmap_element bitmap_zero_bits; /* An element of all zero bits. */
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static bitmap_element *bitmap_free; /* Freelist of bitmap elements. */
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static void bitmap_element_free PARAMS ((bitmap, bitmap_element *));
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static bitmap_element *bitmap_element_allocate PARAMS ((void));
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static int bitmap_element_zerop PARAMS ((bitmap_element *));
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static void bitmap_element_link PARAMS ((bitmap, bitmap_element *));
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static bitmap_element *bitmap_find_bit PARAMS ((bitmap, unsigned int));
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/* Free a bitmap element. Since these are allocated off the
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bitmap_obstack, "free" actually means "put onto the freelist". */
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static INLINE void
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bitmap_element_free (head, elt)
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bitmap head;
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bitmap_element *elt;
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{
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bitmap_element *next = elt->next;
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bitmap_element *prev = elt->prev;
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if (prev)
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prev->next = next;
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if (next)
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next->prev = prev;
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if (head->first == elt)
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head->first = next;
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/* Since the first thing we try is to insert before current,
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make current the next entry in preference to the previous. */
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if (head->current == elt)
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{
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head->current = next != 0 ? next : prev;
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if (head->current)
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head->indx = head->current->indx;
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}
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elt->next = bitmap_free;
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bitmap_free = elt;
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}
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/* Allocate a bitmap element. The bits are cleared, but nothing else is. */
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static INLINE bitmap_element *
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bitmap_element_allocate ()
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{
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bitmap_element *element;
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if (bitmap_free != 0)
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{
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element = bitmap_free;
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bitmap_free = element->next;
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}
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else
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{
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/* We can't use gcc_obstack_init to initialize the obstack since
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print-rtl.c now calls bitmap functions, and bitmap is linked
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into the gen* functions. */
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if (!bitmap_obstack_init)
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{
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bitmap_obstack_init = TRUE;
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/* Let particular systems override the size of a chunk. */
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#ifndef OBSTACK_CHUNK_SIZE
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#define OBSTACK_CHUNK_SIZE 0
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#endif
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/* Let them override the alloc and free routines too. */
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#ifndef OBSTACK_CHUNK_ALLOC
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#define OBSTACK_CHUNK_ALLOC xmalloc
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#endif
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#ifndef OBSTACK_CHUNK_FREE
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#define OBSTACK_CHUNK_FREE free
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#endif
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#if !defined(__GNUC__) || (__GNUC__ < 2)
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#define __alignof__(type) 0
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#endif
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obstack_specify_allocation (&bitmap_obstack, OBSTACK_CHUNK_SIZE,
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__alignof__ (bitmap_element),
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(void *(*) PARAMS ((long))) OBSTACK_CHUNK_ALLOC,
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(void (*) PARAMS ((void *))) OBSTACK_CHUNK_FREE);
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}
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element = (bitmap_element *) obstack_alloc (&bitmap_obstack,
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sizeof (bitmap_element));
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}
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memset (element->bits, 0, sizeof (element->bits));
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return element;
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}
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/* Release any memory allocated by bitmaps. */
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void
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bitmap_release_memory ()
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{
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bitmap_free = 0;
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if (bitmap_obstack_init)
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{
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bitmap_obstack_init = FALSE;
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obstack_free (&bitmap_obstack, NULL);
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}
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}
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/* Return nonzero if all bits in an element are zero. */
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static INLINE int
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bitmap_element_zerop (element)
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bitmap_element *element;
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{
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#if BITMAP_ELEMENT_WORDS == 2
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return (element->bits[0] | element->bits[1]) == 0;
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#else
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int i;
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for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
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if (element->bits[i] != 0)
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return 0;
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return 1;
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#endif
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}
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/* Link the bitmap element into the current bitmap linked list. */
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static INLINE void
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bitmap_element_link (head, element)
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bitmap head;
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bitmap_element *element;
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{
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unsigned int indx = element->indx;
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bitmap_element *ptr;
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/* If this is the first and only element, set it in. */
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if (head->first == 0)
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{
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element->next = element->prev = 0;
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head->first = element;
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}
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/* If this index is less than that of the current element, it goes someplace
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before the current element. */
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else if (indx < head->indx)
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{
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for (ptr = head->current;
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ptr->prev != 0 && ptr->prev->indx > indx;
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ptr = ptr->prev)
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;
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if (ptr->prev)
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ptr->prev->next = element;
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else
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head->first = element;
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element->prev = ptr->prev;
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element->next = ptr;
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ptr->prev = element;
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}
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/* Otherwise, it must go someplace after the current element. */
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else
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{
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for (ptr = head->current;
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ptr->next != 0 && ptr->next->indx < indx;
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ptr = ptr->next)
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;
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if (ptr->next)
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ptr->next->prev = element;
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element->next = ptr->next;
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element->prev = ptr;
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ptr->next = element;
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}
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/* Set up so this is the first element searched. */
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head->current = element;
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head->indx = indx;
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}
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/* Clear a bitmap by freeing the linked list. */
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INLINE void
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bitmap_clear (head)
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bitmap head;
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{
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bitmap_element *element, *next;
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for (element = head->first; element != 0; element = next)
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{
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next = element->next;
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element->next = bitmap_free;
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bitmap_free = element;
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}
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head->first = head->current = 0;
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}
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/* Copy a bitmap to another bitmap. */
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void
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bitmap_copy (to, from)
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bitmap to;
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bitmap from;
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{
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bitmap_element *from_ptr, *to_ptr = 0;
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#if BITMAP_ELEMENT_WORDS != 2
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int i;
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#endif
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bitmap_clear (to);
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/* Copy elements in forward direction one at a time */
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for (from_ptr = from->first; from_ptr; from_ptr = from_ptr->next)
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{
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bitmap_element *to_elt = bitmap_element_allocate ();
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to_elt->indx = from_ptr->indx;
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#if BITMAP_ELEMENT_WORDS == 2
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to_elt->bits[0] = from_ptr->bits[0];
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to_elt->bits[1] = from_ptr->bits[1];
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#else
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for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
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to_elt->bits[i] = from_ptr->bits[i];
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#endif
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/* Here we have a special case of bitmap_element_link, for the case
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where we know the links are being entered in sequence. */
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if (to_ptr == 0)
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{
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to->first = to->current = to_elt;
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to->indx = from_ptr->indx;
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to_elt->next = to_elt->prev = 0;
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}
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else
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{
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to_elt->prev = to_ptr;
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to_elt->next = 0;
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to_ptr->next = to_elt;
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}
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to_ptr = to_elt;
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}
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}
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/* Find a bitmap element that would hold a bitmap's bit.
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Update the `current' field even if we can't find an element that
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would hold the bitmap's bit to make eventual allocation
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faster. */
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static INLINE bitmap_element *
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bitmap_find_bit (head, bit)
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bitmap head;
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unsigned int bit;
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{
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bitmap_element *element;
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unsigned HOST_WIDE_INT indx = bit / BITMAP_ELEMENT_ALL_BITS;
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if (head->current == 0
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|| head->indx == indx)
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return head->current;
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if (head->indx > indx)
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for (element = head->current;
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element->prev != 0 && element->indx > indx;
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element = element->prev)
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;
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else
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for (element = head->current;
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element->next != 0 && element->indx < indx;
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element = element->next)
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;
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/* `element' is the nearest to the one we want. If it's not the one we
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want, the one we want doesn't exist. */
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head->current = element;
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head->indx = element->indx;
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if (element != 0 && element->indx != indx)
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element = 0;
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return element;
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}
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/* Clear a single bit in a bitmap. */
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void
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bitmap_clear_bit (head, bit)
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bitmap head;
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int bit;
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{
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bitmap_element *ptr = bitmap_find_bit (head, bit);
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if (ptr != 0)
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{
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unsigned bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT;
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unsigned word_num = ((bit / (unsigned) HOST_BITS_PER_WIDE_INT)
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% BITMAP_ELEMENT_WORDS);
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ptr->bits[word_num] &= ~ (((unsigned HOST_WIDE_INT) 1) << bit_num);
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/* If we cleared the entire word, free up the element */
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if (bitmap_element_zerop (ptr))
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bitmap_element_free (head, ptr);
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}
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}
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/* Set a single bit in a bitmap. */
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void
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bitmap_set_bit (head, bit)
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bitmap head;
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int bit;
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{
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bitmap_element *ptr = bitmap_find_bit (head, bit);
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unsigned word_num
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= ((bit / (unsigned) HOST_BITS_PER_WIDE_INT) % BITMAP_ELEMENT_WORDS);
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unsigned bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT;
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unsigned HOST_WIDE_INT bit_val = ((unsigned HOST_WIDE_INT) 1) << bit_num;
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if (ptr == 0)
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{
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ptr = bitmap_element_allocate ();
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ptr->indx = bit / BITMAP_ELEMENT_ALL_BITS;
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ptr->bits[word_num] = bit_val;
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bitmap_element_link (head, ptr);
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}
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else
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ptr->bits[word_num] |= bit_val;
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}
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/* Return whether a bit is set within a bitmap. */
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int
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bitmap_bit_p (head, bit)
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bitmap head;
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int bit;
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{
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bitmap_element *ptr;
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unsigned bit_num;
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unsigned word_num;
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ptr = bitmap_find_bit (head, bit);
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if (ptr == 0)
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return 0;
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bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT;
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word_num
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= ((bit / (unsigned) HOST_BITS_PER_WIDE_INT) % BITMAP_ELEMENT_WORDS);
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return (ptr->bits[word_num] >> bit_num) & 1;
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}
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/* Return the bit number of the first set bit in the bitmap, or -1
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if the bitmap is empty. */
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int
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bitmap_first_set_bit (a)
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bitmap a;
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{
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bitmap_element *ptr = a->first;
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unsigned HOST_WIDE_INT word;
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unsigned word_num, bit_num;
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if (ptr == NULL)
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return -1;
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#if BITMAP_ELEMENT_WORDS == 2
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word_num = 0, word = ptr->bits[0];
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if (word == 0)
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word_num = 1, word = ptr->bits[1];
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#else
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for (word_num = 0; word_num < BITMAP_ELEMENT_WORDS; ++word_num)
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if ((word = ptr->bits[word_num]) != 0)
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break;
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#endif
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/* Binary search for the first set bit. */
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/* ??? It'd be nice to know if ffs or ffsl was available. */
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bit_num = 0;
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word = word & -word;
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#if HOST_BITS_PER_WIDE_INT > 64
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#error "Fill out the table."
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#endif
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#if HOST_BITS_PER_WIDE_INT > 32
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if ((word & 0xffffffff) == 0)
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word >>= 32, bit_num += 32;
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#endif
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if ((word & 0xffff) == 0)
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word >>= 16, bit_num += 16;
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if ((word & 0xff) == 0)
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word >>= 8, bit_num += 8;
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if (word & 0xf0)
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bit_num += 4;
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if (word & 0xcc)
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bit_num += 2;
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if (word & 0xaa)
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bit_num += 1;
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return (ptr->indx * BITMAP_ELEMENT_ALL_BITS
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+ word_num * HOST_BITS_PER_WIDE_INT
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+ bit_num);
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}
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/* Return the bit number of the last set bit in the bitmap, or -1
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if the bitmap is empty. */
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int
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bitmap_last_set_bit (a)
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bitmap a;
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{
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bitmap_element *ptr = a->first;
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unsigned HOST_WIDE_INT word;
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unsigned word_num, bit_num;
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if (ptr == NULL)
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return -1;
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while (ptr->next != NULL)
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ptr = ptr->next;
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#if BITMAP_ELEMENT_WORDS == 2
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word_num = 1, word = ptr->bits[1];
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if (word == 0)
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word_num = 0, word = ptr->bits[0];
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#else
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for (word_num = BITMAP_ELEMENT_WORDS; word_num-- > 0; )
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if ((word = ptr->bits[word_num]) != 0)
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break;
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#endif
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/* Binary search for the last set bit. */
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bit_num = 0;
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#if HOST_BITS_PER_WIDE_INT > 64
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#error "Fill out the table."
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#endif
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#if HOST_BITS_PER_WIDE_INT > 32
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if (word & ~ (unsigned HOST_WIDE_INT) 0xffffffff)
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word >>= 32, bit_num += 32;
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#endif
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if (word & 0xffff0000)
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word >>= 16, bit_num += 16;
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if (word & 0xff00)
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word >>= 8, bit_num += 8;
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if (word & 0xf0)
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word >>= 4, bit_num += 4;
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if (word & 0xc)
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word >>= 2, bit_num += 2;
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if (word & 0x2)
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bit_num += 1;
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return (ptr->indx * BITMAP_ELEMENT_ALL_BITS
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+ word_num * HOST_BITS_PER_WIDE_INT
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+ bit_num);
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}
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/* Store in bitmap TO the result of combining bitmap FROM1 and FROM2 using
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a specific bit manipulation. Return true if TO changes. */
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int
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bitmap_operation (to, from1, from2, operation)
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bitmap to;
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bitmap from1;
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bitmap from2;
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enum bitmap_bits operation;
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{
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#define HIGHEST_INDEX (unsigned int) ~0
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bitmap_element *from1_ptr = from1->first;
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bitmap_element *from2_ptr = from2->first;
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unsigned int indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
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unsigned int indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
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bitmap_element *to_ptr = to->first;
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bitmap_element *from1_tmp;
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bitmap_element *from2_tmp;
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bitmap_element *to_tmp;
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unsigned int indx;
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int changed = 0;
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#if BITMAP_ELEMENT_WORDS == 2
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#define DOIT(OP) \
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do { \
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unsigned HOST_WIDE_INT t0, t1, f10, f11, f20, f21; \
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f10 = from1_tmp->bits[0]; \
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f20 = from2_tmp->bits[0]; \
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t0 = f10 OP f20; \
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changed |= (t0 != to_tmp->bits[0]); \
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f11 = from1_tmp->bits[1]; \
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f21 = from2_tmp->bits[1]; \
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t1 = f11 OP f21; \
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changed |= (t1 != to_tmp->bits[1]); \
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to_tmp->bits[0] = t0; \
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to_tmp->bits[1] = t1; \
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} while (0)
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#else
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#define DOIT(OP) \
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do { \
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unsigned HOST_WIDE_INT t, f1, f2; \
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int i; \
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for (i = 0; i < BITMAP_ELEMENT_WORDS; ++i) \
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{ \
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f1 = from1_tmp->bits[i]; \
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f2 = from2_tmp->bits[i]; \
|
||
t = f1 OP f2; \
|
||
changed |= (t != to_tmp->bits[i]); \
|
||
to_tmp->bits[i] = t; \
|
||
} \
|
||
} while (0)
|
||
#endif
|
||
|
||
to->first = to->current = 0;
|
||
|
||
while (from1_ptr != 0 || from2_ptr != 0)
|
||
{
|
||
/* Figure out whether we need to substitute zero elements for
|
||
missing links. */
|
||
if (indx1 == indx2)
|
||
{
|
||
indx = indx1;
|
||
from1_tmp = from1_ptr;
|
||
from2_tmp = from2_ptr;
|
||
from1_ptr = from1_ptr->next;
|
||
indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
|
||
from2_ptr = from2_ptr->next;
|
||
indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
|
||
}
|
||
else if (indx1 < indx2)
|
||
{
|
||
indx = indx1;
|
||
from1_tmp = from1_ptr;
|
||
from2_tmp = &bitmap_zero_bits;
|
||
from1_ptr = from1_ptr->next;
|
||
indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
|
||
}
|
||
else
|
||
{
|
||
indx = indx2;
|
||
from1_tmp = &bitmap_zero_bits;
|
||
from2_tmp = from2_ptr;
|
||
from2_ptr = from2_ptr->next;
|
||
indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
|
||
}
|
||
|
||
/* Find the appropriate element from TO. Begin by discarding
|
||
elements that we've skipped. */
|
||
while (to_ptr && to_ptr->indx < indx)
|
||
{
|
||
changed = 1;
|
||
to_tmp = to_ptr;
|
||
to_ptr = to_ptr->next;
|
||
to_tmp->next = bitmap_free;
|
||
bitmap_free = to_tmp;
|
||
}
|
||
if (to_ptr && to_ptr->indx == indx)
|
||
{
|
||
to_tmp = to_ptr;
|
||
to_ptr = to_ptr->next;
|
||
}
|
||
else
|
||
to_tmp = bitmap_element_allocate ();
|
||
|
||
/* Do the operation, and if any bits are set, link it into the
|
||
linked list. */
|
||
switch (operation)
|
||
{
|
||
default:
|
||
abort ();
|
||
|
||
case BITMAP_AND:
|
||
DOIT (&);
|
||
break;
|
||
|
||
case BITMAP_AND_COMPL:
|
||
DOIT (&~);
|
||
break;
|
||
|
||
case BITMAP_IOR:
|
||
DOIT (|);
|
||
break;
|
||
case BITMAP_IOR_COMPL:
|
||
DOIT (|~);
|
||
break;
|
||
case BITMAP_XOR:
|
||
DOIT (^);
|
||
break;
|
||
}
|
||
|
||
if (! bitmap_element_zerop (to_tmp))
|
||
{
|
||
to_tmp->indx = indx;
|
||
bitmap_element_link (to, to_tmp);
|
||
}
|
||
else
|
||
{
|
||
to_tmp->next = bitmap_free;
|
||
bitmap_free = to_tmp;
|
||
}
|
||
}
|
||
|
||
/* If we have elements of TO left over, free the lot. */
|
||
if (to_ptr)
|
||
{
|
||
changed = 1;
|
||
for (to_tmp = to_ptr; to_tmp->next ; to_tmp = to_tmp->next)
|
||
continue;
|
||
to_tmp->next = bitmap_free;
|
||
bitmap_free = to_ptr;
|
||
}
|
||
|
||
#undef DOIT
|
||
|
||
return changed;
|
||
}
|
||
|
||
/* Return true if two bitmaps are identical. */
|
||
|
||
int
|
||
bitmap_equal_p (a, b)
|
||
bitmap a;
|
||
bitmap b;
|
||
{
|
||
bitmap_head c;
|
||
int ret;
|
||
|
||
c.first = c.current = 0;
|
||
ret = ! bitmap_operation (&c, a, b, BITMAP_XOR);
|
||
bitmap_clear (&c);
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Or into bitmap TO bitmap FROM1 and'ed with the complement of
|
||
bitmap FROM2. */
|
||
|
||
void
|
||
bitmap_ior_and_compl (to, from1, from2)
|
||
bitmap to;
|
||
bitmap from1;
|
||
bitmap from2;
|
||
{
|
||
bitmap_head tmp;
|
||
|
||
tmp.first = tmp.current = 0;
|
||
|
||
bitmap_operation (&tmp, from1, from2, BITMAP_AND_COMPL);
|
||
bitmap_operation (to, to, &tmp, BITMAP_IOR);
|
||
bitmap_clear (&tmp);
|
||
}
|
||
|
||
int
|
||
bitmap_union_of_diff (dst, a, b, c)
|
||
bitmap dst;
|
||
bitmap a;
|
||
bitmap b;
|
||
bitmap c;
|
||
{
|
||
bitmap_head tmp;
|
||
int changed;
|
||
|
||
tmp.first = tmp.current = 0;
|
||
|
||
bitmap_operation (&tmp, b, c, BITMAP_AND_COMPL);
|
||
changed = bitmap_operation (dst, &tmp, a, BITMAP_IOR);
|
||
bitmap_clear (&tmp);
|
||
|
||
return changed;
|
||
}
|
||
|
||
/* Initialize a bitmap header. */
|
||
|
||
bitmap
|
||
bitmap_initialize (head)
|
||
bitmap head;
|
||
{
|
||
head->first = head->current = 0;
|
||
|
||
return head;
|
||
}
|
||
|
||
/* Debugging function to print out the contents of a bitmap. */
|
||
|
||
void
|
||
debug_bitmap_file (file, head)
|
||
FILE *file;
|
||
bitmap head;
|
||
{
|
||
bitmap_element *ptr;
|
||
|
||
fprintf (file, "\nfirst = ");
|
||
fprintf (file, HOST_PTR_PRINTF, (PTR) head->first);
|
||
fprintf (file, " current = ");
|
||
fprintf (file, HOST_PTR_PRINTF, (PTR) head->current);
|
||
fprintf (file, " indx = %u\n", head->indx);
|
||
|
||
for (ptr = head->first; ptr; ptr = ptr->next)
|
||
{
|
||
int i, j, col = 26;
|
||
|
||
fprintf (file, "\t");
|
||
fprintf (file, HOST_PTR_PRINTF, (PTR) ptr);
|
||
fprintf (file, " next = ");
|
||
fprintf (file, HOST_PTR_PRINTF, (PTR) ptr->next);
|
||
fprintf (file, " prev = ");
|
||
fprintf (file, HOST_PTR_PRINTF, (PTR) ptr->prev);
|
||
fprintf (file, " indx = %u\n\t\tbits = {", ptr->indx);
|
||
|
||
for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
|
||
for (j = 0; j < HOST_BITS_PER_WIDE_INT; j++)
|
||
if ((ptr->bits[i] >> j) & 1)
|
||
{
|
||
if (col > 70)
|
||
{
|
||
fprintf (file, "\n\t\t\t");
|
||
col = 24;
|
||
}
|
||
|
||
fprintf (file, " %u", (ptr->indx * BITMAP_ELEMENT_ALL_BITS
|
||
+ i * HOST_BITS_PER_WIDE_INT + j));
|
||
col += 4;
|
||
}
|
||
|
||
fprintf (file, " }\n");
|
||
}
|
||
}
|
||
|
||
/* Function to be called from the debugger to print the contents
|
||
of a bitmap. */
|
||
|
||
void
|
||
debug_bitmap (head)
|
||
bitmap head;
|
||
{
|
||
debug_bitmap_file (stdout, head);
|
||
}
|
||
|
||
/* Function to print out the contents of a bitmap. Unlike debug_bitmap_file,
|
||
it does not print anything but the bits. */
|
||
|
||
void
|
||
bitmap_print (file, head, prefix, suffix)
|
||
FILE *file;
|
||
bitmap head;
|
||
const char *prefix;
|
||
const char *suffix;
|
||
{
|
||
const char *comma = "";
|
||
int i;
|
||
|
||
fputs (prefix, file);
|
||
EXECUTE_IF_SET_IN_BITMAP (head, 0, i,
|
||
{
|
||
fprintf (file, "%s%d", comma, i);
|
||
comma = ", ";
|
||
});
|
||
fputs (suffix, file);
|
||
}
|