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-rw-r--r--gnu/usr.bin/gcc/bitmap.c645
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diff --git a/gnu/usr.bin/gcc/bitmap.c b/gnu/usr.bin/gcc/bitmap.c
new file mode 100644
index 00000000000..f982f46392a
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+++ b/gnu/usr.bin/gcc/bitmap.c
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+/* Functions to support general ended bitmaps.
+ Copyright (C) 1997 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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, or (at your option)
+any later version.
+
+GNU CC 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 GNU CC; see the file COPYING. If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include "config.h"
+#include <stdio.h>
+#include "rtl.h"
+#include "flags.h"
+#include "obstack.h"
+#include "regs.h"
+#include "basic-block.h"
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#ifdef NEED_DECLARATION_FREE
+extern void free PROTO((void *));
+#endif
+
+/* Obstack to allocate bitmap elements from. */
+static struct obstack bitmap_obstack;
+static int bitmap_obstack_init = FALSE;
+
+
+#ifndef INLINE
+#ifndef __GNUC__
+#define INLINE
+#else
+#define INLINE __inline__
+#endif
+#endif
+
+/* Global data */
+bitmap_element bitmap_zero; /* An element of all zero bits. */
+bitmap_element *bitmap_free; /* Freelist of bitmap elements. */
+
+static void bitmap_element_free PROTO((bitmap, bitmap_element *));
+static bitmap_element *bitmap_element_allocate PROTO((bitmap));
+static int bitmap_element_zerop PROTO((bitmap_element *));
+static void bitmap_element_link PROTO((bitmap, bitmap_element *));
+static bitmap_element *bitmap_find_bit PROTO((bitmap, unsigned int));
+
+/* Free a bitmap element */
+
+static INLINE void
+bitmap_element_free (head, elt)
+ bitmap head;
+ bitmap_element *elt;
+{
+ bitmap_element *next = elt->next;
+ bitmap_element *prev = elt->prev;
+
+ if (prev)
+ prev->next = next;
+
+ if (next)
+ next->prev = prev;
+
+ if (head->first == elt)
+ head->first = next;
+
+ /* Since the first thing we try is to insert before current,
+ make current the next entry in preference to the previous. */
+ if (head->current == elt)
+ head->current = next != 0 ? next : prev;
+
+ elt->next = bitmap_free;
+ bitmap_free = elt;
+}
+
+/* Allocate a bitmap element. The bits are cleared, but nothing else is. */
+
+static INLINE bitmap_element *
+bitmap_element_allocate (head)
+ bitmap head;
+{
+ bitmap_element *element;
+ int i;
+
+ if (bitmap_free != 0)
+ {
+ element = bitmap_free;
+ bitmap_free = element->next;
+ }
+ else
+ {
+ /* We can't use gcc_obstack_init to initialize the obstack since
+ print-rtl.c now calls bitmap functions, and bitmap is linked
+ into the gen* functions. */
+ if (!bitmap_obstack_init)
+ {
+ bitmap_obstack_init = TRUE;
+
+ /* 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. */
+#ifndef OBSTACK_CHUNK_ALLOC
+#define OBSTACK_CHUNK_ALLOC xmalloc
+#endif
+#ifndef OBSTACK_CHUNK_FREE
+#define OBSTACK_CHUNK_FREE free
+#endif
+
+#if !defined(__GNUC__) || (__GNUC__ < 2)
+#define __alignof__(type) 0
+#endif
+
+ obstack_specify_allocation (&bitmap_obstack, OBSTACK_CHUNK_SIZE,
+ __alignof__ (bitmap_element),
+ (void *(*) ()) OBSTACK_CHUNK_ALLOC,
+ (void (*) ()) OBSTACK_CHUNK_FREE);
+ }
+
+ element = (bitmap_element *) obstack_alloc (&bitmap_obstack,
+ sizeof (bitmap_element));
+ }
+
+#if BITMAP_ELEMENT_WORDS == 2
+ element->bits[0] = element->bits[1] = 0;
+#else
+ for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
+ element->bits[i] = 0;
+#endif
+
+ return element;
+}
+
+/* Return nonzero if all bits in an element are zero. */
+
+static INLINE int
+bitmap_element_zerop (element)
+ bitmap_element *element;
+{
+#if BITMAP_ELEMENT_WORDS == 2
+ return (element->bits[0] | element->bits[1]) == 0;
+#else
+ int i;
+
+ for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
+ if (element->bits[i] != 0)
+ return 0;
+
+ return 1;
+#endif
+}
+
+/* Link the bitmap element into the current bitmap linked list. */
+
+static INLINE void
+bitmap_element_link (head, element)
+ bitmap head;
+ bitmap_element *element;
+{
+ unsigned int indx = element->indx;
+ bitmap_element *ptr;
+
+ /* If this is the first and only element, set it in. */
+ if (head->first == 0)
+ {
+ element->next = element->prev = 0;
+ head->first = element;
+ }
+
+ /* If this index is less than that of the current element, it goes someplace
+ before the current element. */
+ else if (indx < head->indx)
+ {
+ for (ptr = head->current;
+ ptr->prev != 0 && ptr->prev->indx > indx;
+ ptr = ptr->prev)
+ ;
+
+ if (ptr->prev)
+ ptr->prev->next = element;
+ else
+ head->first = element;
+
+ element->prev = ptr->prev;
+ element->next = ptr;
+ ptr->prev = element;
+ }
+
+ /* Otherwise, it must go someplace after the current element. */
+ else
+ {
+ for (ptr = head->current;
+ ptr->next != 0 && ptr->next->indx < indx;
+ ptr = ptr->next)
+ ;
+
+ if (ptr->next)
+ ptr->next->prev = element;
+
+ element->next = ptr->next;
+ element->prev = ptr;
+ ptr->next = element;
+ }
+
+ /* Set up so this is the first element searched. */
+ head->current = element;
+ head->indx = indx;
+}
+
+/* Clear a bitmap by freeing the linked list. */
+
+void INLINE
+bitmap_clear (head)
+ bitmap head;
+{
+ bitmap_element *element, *next;
+
+ for (element = head->first; element != 0; element = next)
+ {
+ next = element->next;
+ element->next = bitmap_free;
+ bitmap_free = element;
+ }
+
+ head->first = head->current = 0;
+}
+
+/* Copy a bitmap to another bitmap */
+
+void
+bitmap_copy (to, from)
+ bitmap to;
+ bitmap from;
+{
+ bitmap_element *from_ptr, *to_ptr = 0;
+ int i;
+
+ bitmap_clear (to);
+
+ /* Copy elements in forward direction one at a time */
+ for (from_ptr = from->first; from_ptr; from_ptr = from_ptr->next)
+ {
+ bitmap_element *to_elt = bitmap_element_allocate (to);
+
+ to_elt->indx = from_ptr->indx;
+
+#if BITMAP_ELEMENT_WORDS == 2
+ to_elt->bits[0] = from_ptr->bits[0];
+ to_elt->bits[1] = from_ptr->bits[1];
+#else
+ for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
+ to_elt->bits[i] = from_ptr->bits[i];
+#endif
+
+ /* Here we have a special case of bitmap_element_link, for the case
+ where we know the links are being entered in sequence. */
+ if (to_ptr == 0)
+ {
+ to->first = to->current = to_elt;
+ to->indx = from_ptr->indx;
+ to_elt->next = to_elt->prev = 0;
+ }
+ else
+ {
+ to_elt->prev = to_ptr;
+ to_elt->next = 0;
+ to_ptr->next = to_elt;
+ }
+
+ to_ptr = to_elt;
+ }
+}
+
+/* Find a bitmap element that would hold a bitmap's bit.
+ Update the `current' field even if we can't find an element that
+ would hold the bitmap's bit to make eventual allocation
+ faster. */
+
+static INLINE bitmap_element *
+bitmap_find_bit (head, bit)
+ bitmap head;
+ unsigned int bit;
+{
+ bitmap_element *element;
+ unsigned HOST_WIDE_INT indx = bit / BITMAP_ELEMENT_ALL_BITS;
+
+ if (head->current == 0)
+ return 0;
+
+ if (head->indx > indx)
+ for (element = head->current;
+ element->prev != 0 && element->indx > indx;
+ element = element->prev)
+ ;
+
+ else
+ for (element = head->current;
+ element->next != 0 && element->indx < indx;
+ element = element->next)
+ ;
+
+ /* `element' is the nearest to the one we want. If it's not the one we
+ want, the one we want doesn't exist. */
+ head->current = element;
+ head->indx = element->indx;
+ if (element != 0 && element->indx != indx)
+ element = 0;
+
+ return element;
+}
+
+/* Clear a single bit in a bitmap. */
+
+void
+bitmap_clear_bit (head, bit)
+ bitmap head;
+ int bit;
+{
+ bitmap_element *ptr = bitmap_find_bit (head, bit);
+
+ if (ptr != 0)
+ {
+ unsigned bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT;
+ unsigned word_num = ((bit / (unsigned) HOST_BITS_PER_WIDE_INT)
+ % BITMAP_ELEMENT_WORDS);
+ ptr->bits[word_num] &= ~ (((unsigned HOST_WIDE_INT) 1) << bit_num);
+
+ /* If we cleared the entire word, free up the element */
+ if (bitmap_element_zerop (ptr))
+ bitmap_element_free (head, ptr);
+ }
+}
+
+
+/* Set a single bit in a bitmap. */
+
+void
+bitmap_set_bit (head, bit)
+ bitmap head;
+ int bit;
+{
+ bitmap_element *ptr = bitmap_find_bit (head, bit);
+ unsigned word_num
+ = ((bit / (unsigned) HOST_BITS_PER_WIDE_INT) % BITMAP_ELEMENT_WORDS);
+ unsigned bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT;
+ unsigned HOST_WIDE_INT bit_val = ((unsigned HOST_WIDE_INT) 1) << bit_num;
+
+ if (ptr == 0)
+ {
+ ptr = bitmap_element_allocate (head);
+ ptr->indx = bit / BITMAP_ELEMENT_ALL_BITS;
+ ptr->bits[word_num] = bit_val;
+ bitmap_element_link (head, ptr);
+ }
+ else
+ ptr->bits[word_num] |= bit_val;
+}
+
+/* Return whether a bit is set within a bitmap. */
+
+int
+bitmap_bit_p (head, bit)
+ bitmap head;
+ int bit;
+{
+ bitmap_element *ptr;
+ unsigned bit_num;
+ unsigned word_num;
+
+ ptr = bitmap_find_bit (head, bit);
+ if (ptr == 0)
+ return 0;
+
+ bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT;
+ word_num
+ = ((bit / (unsigned) HOST_BITS_PER_WIDE_INT) % BITMAP_ELEMENT_WORDS);
+
+ return
+ (ptr->bits[word_num] & (((unsigned HOST_WIDE_INT) 1) << bit_num)) != 0;
+}
+
+/* Store in bitmap TO the result of combining bitmap FROM1 and
+ FROM2 using a specific bit manipulation. */
+
+void
+bitmap_operation (to, from1, from2, operation)
+ bitmap to;
+ bitmap from1;
+ bitmap from2;
+ enum bitmap_bits operation;
+{
+ bitmap_element *delete_list = 0;
+ bitmap_element *from1_ptr = from1->first;
+ bitmap_element *from2_ptr = from2->first;
+ unsigned int indx1
+ = (from1_ptr) ? from1_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0;
+ unsigned int indx2
+ = (from2_ptr) ? from2_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0;
+ bitmap_element *to_ptr = 0;
+ bitmap_element *from1_tmp;
+ bitmap_element *from2_tmp;
+ unsigned int indx;
+ int i;
+
+ /* To simplify things, always create a new list. If the old list was one
+ of the inputs, free it later. Otherwise, free it now. */
+ if (to == from1 || to == from2)
+ {
+ delete_list = to->first;
+ to->first = to->current = 0;
+ }
+ else
+ bitmap_clear (to);
+
+ 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 : ~ (unsigned HOST_WIDE_INT) 0;
+ from2_ptr = from2_ptr->next;
+ indx2 = (from2_ptr) ? from2_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0;
+ }
+ else if (indx1 < indx2)
+ {
+ indx = indx1;
+ from1_tmp = from1_ptr;
+ from2_tmp = &bitmap_zero;
+ from1_ptr = from1_ptr->next;
+ indx1 = (from1_ptr) ? from1_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0;
+ }
+ else
+ {
+ indx = indx2;
+ from1_tmp = &bitmap_zero;
+ from2_tmp = from2_ptr;
+ from2_ptr = from2_ptr->next;
+ indx2 = (from2_ptr) ? from2_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0;
+ }
+
+ if (to_ptr == 0)
+ to_ptr = bitmap_element_allocate (to);
+
+ /* Do the operation, and if any bits are set, link it into the
+ linked list. */
+ switch (operation)
+ {
+ default:
+ abort ();
+
+ case BITMAP_AND:
+#if BITMAP_ELEMENT_WORDS == 2
+ to_ptr->bits[0] = from1_tmp->bits[0] & from2_tmp->bits[0];
+ to_ptr->bits[1] = from1_tmp->bits[1] & from2_tmp->bits[1];
+#else
+ for (i = BITMAP_ELEMENT_WORDS - 1; i >= 0; i--)
+ to_ptr->bits[i] = from1_tmp->bits[i] & from2_tmp->bits[i];
+#endif
+ break;
+
+ case BITMAP_AND_COMPL:
+#if BITMAP_ELEMENT_WORDS == 2
+ to_ptr->bits[0] = from1_tmp->bits[0] & ~ from2_tmp->bits[0];
+ to_ptr->bits[1] = from1_tmp->bits[1] & ~ from2_tmp->bits[1];
+#else
+ for (i = BITMAP_ELEMENT_WORDS - 1; i >= 0; i--)
+ to_ptr->bits[i] = from1_tmp->bits[i] & ~ from2_tmp->bits[i];
+#endif
+ break;
+
+ case BITMAP_IOR:
+#if BITMAP_ELEMENT_WORDS == 2
+ to_ptr->bits[0] = from1_tmp->bits[0] | from2_tmp->bits[0];
+ to_ptr->bits[1] = from1_tmp->bits[1] | from2_tmp->bits[1];
+#else
+ for (i = BITMAP_ELEMENT_WORDS - 1; i >= 0; i--)
+ to_ptr->bits[i] = from1_tmp->bits[i] | from2_tmp->bits[i];
+#endif
+ break;
+ }
+
+ if (! bitmap_element_zerop (to_ptr))
+ {
+ to_ptr->indx = indx;
+ bitmap_element_link (to, to_ptr);
+ to_ptr = 0;
+ }
+ }
+
+ /* If we have an unallocated element due to the last element being 0,
+ release it back to the free pool. Don't bother calling
+ bitmap_element_free since it was never linked into a bitmap. */
+ if (to_ptr != 0)
+ {
+ to_ptr->next = bitmap_free;
+ bitmap_free = to_ptr;
+ }
+
+ /* If the output bitmap was one of the inputs, free up its
+ elements now that we're done. */
+ for (; delete_list != 0; delete_list = to_ptr)
+ {
+ to_ptr = delete_list->next;
+ delete_list->next = bitmap_free;
+ bitmap_free = delete_list;
+ }
+}
+
+/* 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);
+}
+
+/* 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
+bitmap_debug_file (file, head)
+ FILE *file;
+ bitmap head;
+{
+ bitmap_element *ptr;
+
+ fprintf (file, "\nfirst = ");
+ fprintf (file, HOST_PTR_PRINTF, (HOST_WIDE_INT) head->first);
+ fprintf (file, " current = ");
+ fprintf (file, HOST_PTR_PRINTF, (HOST_WIDE_INT) 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, (HOST_WIDE_INT) ptr);
+ fprintf (file, " next = ");
+ fprintf (file, HOST_PTR_PRINTF, (HOST_WIDE_INT) ptr->next);
+ fprintf (file, " prev = ");
+ fprintf (file, HOST_PTR_PRINTF, (HOST_WIDE_INT) 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] & (((unsigned HOST_WIDE_INT) 1) << j)) != 0)
+ {
+ 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;
+{
+ bitmap_debug_file (stdout, head);
+}
+
+/* Function to print out the contents of a bitmap. Unlike bitmap_debug_file,
+ it does not print anything but the bits. */
+
+void
+bitmap_print (file, head, prefix, suffix)
+ FILE *file;
+ bitmap head;
+ char *prefix;
+ char *suffix;
+{
+ 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);
+}
+
+/* Release any memory allocated by bitmaps. */
+
+void
+bitmap_release_memory ()
+{
+ bitmap_free = 0;
+ if (bitmap_obstack_init)
+ {
+ bitmap_obstack_init = FALSE;
+ obstack_free (&bitmap_obstack, NULL_PTR);
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-04 22:10:32 +0000