316 lines
10 KiB
C
316 lines
10 KiB
C
/* Functions to support general ended bitmaps.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Number of words to use for each element in the linked list. */
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#ifndef BITMAP_ELEMENT_WORDS
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#define BITMAP_ELEMENT_WORDS 2
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#endif
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/* Number of bits in each actual element of a bitmap. We get slightly better
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code for bit % BITMAP_ELEMENT_ALL_BITS and bit / BITMAP_ELEMENT_ALL_BITS if
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bits is unsigned, assuming it is a power of 2. */
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#define BITMAP_ELEMENT_ALL_BITS \
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((unsigned) (BITMAP_ELEMENT_WORDS * HOST_BITS_PER_WIDE_INT))
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/* Bitmap set element. We use a linked list to hold only the bits that
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are set. This allows for use to grow the bitset dynamically without
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having to realloc and copy a giant bit array. The `prev' field is
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undefined for an element on the free list. */
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typedef struct bitmap_element_def
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{
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struct bitmap_element_def *next; /* Next element. */
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struct bitmap_element_def *prev; /* Previous element. */
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unsigned int indx; /* regno/BITMAP_ELEMENT_ALL_BITS. */
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unsigned HOST_WIDE_INT bits[BITMAP_ELEMENT_WORDS]; /* Bits that are set. */
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} bitmap_element;
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/* Head of bitmap linked list. */
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typedef struct bitmap_head_def {
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bitmap_element *first; /* First element in linked list. */
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bitmap_element *current; /* Last element looked at. */
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int indx; /* Index of last element looked at. */
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} bitmap_head, *bitmap;
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/* Enumeration giving the various operations we support. */
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enum bitmap_bits {
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BITMAP_AND, /* TO = FROM1 & FROM2 */
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BITMAP_AND_COMPL, /* TO = FROM1 & ~ FROM2 */
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BITMAP_IOR /* TO = FROM1 | FROM2 */
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};
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/* Global data */
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extern bitmap_element *bitmap_free; /* Freelist of bitmap elements */
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extern bitmap_element bitmap_zero; /* Zero bitmap element */
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/* Clear a bitmap by freeing up the linked list. */
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extern void bitmap_clear PROTO((bitmap));
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/* Copy a bitmap to another bitmap. */
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extern void bitmap_copy PROTO((bitmap, bitmap));
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/* Perform an operation on two bitmaps, yielding a third. */
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extern void bitmap_operation PROTO((bitmap, bitmap, bitmap, enum bitmap_bits));
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/* `or' into one bitmap the `and' of a second bitmap witih the complement
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of a third. */
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extern void bitmap_ior_and_compl PROTO((bitmap, bitmap, bitmap));
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/* Clear a single register in a register set. */
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extern void bitmap_clear_bit PROTO((bitmap, int));
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/* Set a single register in a register set. */
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extern void bitmap_set_bit PROTO((bitmap, int));
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/* Return true if a register is set in a register set. */
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extern int bitmap_bit_p PROTO((bitmap, int));
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/* Debug functions to print a bitmap linked list. */
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extern void bitmap_debug PROTO((bitmap));
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extern void bitmap_debug_file STDIO_PROTO((FILE *, bitmap));
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/* Print a bitmap */
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extern void bitmap_print STDIO_PROTO((FILE *, bitmap, char *, char *));
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/* Initialize a bitmap header. */
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extern bitmap bitmap_initialize PROTO((bitmap));
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/* Release all memory held by bitmaps. */
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extern void bitmap_release_memory PROTO((void));
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/* Allocate a bitmap with oballoc. */
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#define BITMAP_OBSTACK_ALLOC(OBSTACK) \
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bitmap_initialize ((bitmap) obstack_alloc (OBSTACK, sizeof (bitmap_head)))
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/* Allocate a bitmap with alloca. */
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#define BITMAP_ALLOCA() \
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bitmap_initialize ((bitmap) alloca (sizeof (bitmap_head)))
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/* Do any cleanup needed on a bitmap when it is no longer used. */
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#define BITMAP_FREE(BITMAP) \
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do { \
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if (BITMAP) \
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{ \
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bitmap_clear (BITMAP); \
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(BITMAP) = 0; \
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} \
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} while (0)
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/* Do any one-time initializations needed for bitmaps. */
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#define BITMAP_INIT_ONCE()
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/* Loop over all bits in BITMAP, starting with MIN, setting BITNUM to the
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bit number and executing CODE for all bits that are set. */
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#define EXECUTE_IF_SET_IN_BITMAP(BITMAP, MIN, BITNUM, CODE) \
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do { \
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bitmap_element *ptr_ = (BITMAP)->first; \
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unsigned int indx_ = (MIN) / BITMAP_ELEMENT_ALL_BITS; \
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unsigned bit_num_ = (MIN) % ((unsigned) HOST_BITS_PER_WIDE_INT); \
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unsigned word_num_ = (((MIN) / ((unsigned) HOST_BITS_PER_WIDE_INT)) \
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% BITMAP_ELEMENT_WORDS); \
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\
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\
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/* Find the block the minimum bit is in. */ \
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while (ptr_ != 0 && ptr_->indx < indx_) \
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ptr_ = ptr_->next; \
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\
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if (ptr_ != 0 && ptr_->indx != indx_) \
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{ \
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bit_num_ = 0; \
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word_num_ = 0; \
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} \
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\
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for (; ptr_ != 0; ptr_ = ptr_->next) \
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{ \
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for (; word_num_ < BITMAP_ELEMENT_WORDS; word_num_++) \
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{ \
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unsigned HOST_WIDE_INT word_ = ptr_->bits[word_num_]; \
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\
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if (word_ != 0) \
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{ \
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for (; bit_num_ < HOST_BITS_PER_WIDE_INT; bit_num_++) \
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{ \
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unsigned HOST_WIDE_INT mask_ \
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= ((unsigned HOST_WIDE_INT) 1) << bit_num_; \
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\
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if ((word_ & mask_) != 0) \
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{ \
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word_ &= ~ mask_; \
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(BITNUM) = (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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CODE; \
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\
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if (word_ == 0) \
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break; \
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} \
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} \
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} \
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\
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bit_num_ = 0; \
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} \
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\
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word_num_ = 0; \
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} \
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} while (0)
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/* Loop over all bits in BITMAP1 and BITMAP2, starting with MIN, setting
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BITNUM to the bit number and executing CODE for all bits that are set in
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the first bitmap and not set in the second. */
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#define EXECUTE_IF_AND_COMPL_IN_BITMAP(BITMAP1, BITMAP2, MIN, BITNUM, CODE) \
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do { \
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bitmap_element *ptr1_ = (BITMAP1)->first; \
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bitmap_element *ptr2_ = (BITMAP2)->first; \
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unsigned int indx_ = (MIN) / BITMAP_ELEMENT_ALL_BITS; \
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unsigned bit_num_ = (MIN) % ((unsigned) HOST_BITS_PER_WIDE_INT); \
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unsigned word_num_ = (((MIN) / ((unsigned) HOST_BITS_PER_WIDE_INT)) \
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% BITMAP_ELEMENT_WORDS); \
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\
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/* Find the block the minimum bit is in in the first bitmap. */ \
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while (ptr1_ != 0 && ptr1_->indx < indx_) \
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ptr1_ = ptr1_->next; \
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\
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if (ptr1_ != 0 && ptr1_->indx != indx_) \
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{ \
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bit_num_ = 0; \
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word_num_ = 0; \
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} \
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\
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for (; ptr1_ != 0 ; ptr1_ = ptr1_->next) \
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{ \
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/* Advance BITMAP2 to the equivalent link, using an all \
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zero element if an equavialent link doesn't exist. */ \
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bitmap_element *tmp2_; \
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\
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while (ptr2_ != 0 && ptr2_->indx < ptr1_->indx) \
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ptr2_ = ptr2_->next; \
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\
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tmp2_ = ((ptr2_ != 0 && ptr2_->indx == ptr1_->indx) \
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? ptr2_ : &bitmap_zero); \
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\
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for (; word_num_ < BITMAP_ELEMENT_WORDS; word_num_++) \
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{ \
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unsigned HOST_WIDE_INT word_ = (ptr1_->bits[word_num_] \
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& ~ tmp2_->bits[word_num_]); \
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if (word_ != 0) \
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{ \
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for (; bit_num_ < HOST_BITS_PER_WIDE_INT; bit_num_++) \
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{ \
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unsigned HOST_WIDE_INT mask_ \
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= ((unsigned HOST_WIDE_INT)1) << bit_num_; \
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\
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if ((word_ & mask_) != 0) \
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{ \
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word_ &= ~ mask_; \
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(BITNUM) = (ptr1_->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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CODE; \
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if (word_ == 0) \
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break; \
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} \
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} \
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} \
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\
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bit_num_ = 0; \
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} \
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\
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word_num_ = 0; \
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} \
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} while (0)
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/* Loop over all bits in BITMAP1 and BITMAP2, starting with MIN, setting
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BITNUM to the bit number and executing CODE for all bits that are set in
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the both bitmaps. */
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#define EXECUTE_IF_AND_IN_BITMAP(BITMAP1, BITMAP2, MIN, BITNUM, CODE) \
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do { \
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bitmap_element *ptr1_ = (BITMAP1)->first; \
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bitmap_element *ptr2_ = (BITMAP2)->first; \
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unsigned int indx_ = (MIN) / BITMAP_ELEMENT_ALL_BITS; \
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unsigned bit_num_ = (MIN) % ((unsigned) HOST_BITS_PER_WIDE_INT); \
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unsigned word_num_ = (((MIN) / ((unsigned) HOST_BITS_PER_WIDE_INT)) \
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% BITMAP_ELEMENT_WORDS); \
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\
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/* Find the block the minimum bit is in in the first bitmap. */ \
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while (ptr1_ != 0 && ptr1_->indx < indx_) \
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ptr1_ = ptr1_->next; \
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\
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if (ptr1_ != 0 && ptr1_->indx != indx_) \
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{ \
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bit_num_ = 0; \
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word_num_ = 0; \
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} \
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\
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for (; ptr1_ != 0 ; ptr1_ = ptr1_->next) \
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{ \
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/* Advance BITMAP2 to the equivalent link */ \
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while (ptr2_ != 0 && ptr2_->indx < ptr1_->indx) \
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ptr2_ = ptr2_->next; \
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\
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if (ptr2_ == 0) \
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{ \
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/* If there are no more elements in BITMAP2, exit loop now.*/ \
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ptr1_ = (bitmap_element *)0; \
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break; \
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} \
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else if (ptr2_->indx > ptr1_->indx) \
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{ \
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bit_num_ = word_num_ = 0; \
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continue; \
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} \
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\
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for (; word_num_ < BITMAP_ELEMENT_WORDS; word_num_++) \
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{ \
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unsigned HOST_WIDE_INT word_ = (ptr1_->bits[word_num_] \
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& ptr2_->bits[word_num_]); \
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if (word_ != 0) \
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{ \
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for (; bit_num_ < HOST_BITS_PER_WIDE_INT; bit_num_++) \
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{ \
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unsigned HOST_WIDE_INT mask_ \
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= ((unsigned HOST_WIDE_INT)1) << bit_num_; \
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\
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if ((word_ & mask_) != 0) \
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{ \
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word_ &= ~ mask_; \
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(BITNUM) = (ptr1_->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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CODE; \
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if (word_ == 0) \
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break; \
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} \
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} \
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} \
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\
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bit_num_ = 0; \
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} \
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\
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word_num_ = 0; \
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} \
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} while (0)
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