d4691e641b
non-i386, non-unix, and generatable files have been trimmed, but can easily be added in later if needed. gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's handy to have both available for reference for such little cost. The freebsd-specific changes will then be committed, and once the dust has settled, the bmakefiles will be committed to use this code.
442 lines
12 KiB
C
442 lines
12 KiB
C
/* Sparse Arrays for Objective C dispatch tables
|
||
Copyright (C) 1993, 1995 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. */
|
||
|
||
/* As a special exception, if you link this library with files
|
||
compiled with GCC to produce an executable, this does not cause
|
||
the resulting executable to be covered by the GNU General Public License.
|
||
This exception does not however invalidate any other reasons why
|
||
the executable file might be covered by the GNU General Public License. */
|
||
|
||
#include "objc/sarray.h"
|
||
#include <stdio.h>
|
||
#include "assert.h"
|
||
|
||
int nbuckets = 0;
|
||
int nindices = 0;
|
||
int narrays = 0;
|
||
int idxsize = 0;
|
||
|
||
#ifdef OBJC_SPARSE2
|
||
const char* __objc_sparse2_id = "2 level sparse indices";
|
||
#endif
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
const char* __objc_sparse3_id = "3 level sparse indices";
|
||
#endif
|
||
|
||
#ifdef __alpha__
|
||
const void *memcpy (void*, const void*, size_t);
|
||
void free (const void*);
|
||
#endif
|
||
|
||
void
|
||
sarray_at_put(struct sarray* array, sidx index, void* element)
|
||
{
|
||
#ifdef OBJC_SPARSE3
|
||
struct sindex** the_index;
|
||
#endif
|
||
struct sbucket** the_bucket;
|
||
#ifdef OBJC_SPARSE3
|
||
size_t ioffset;
|
||
#endif
|
||
size_t boffset;
|
||
size_t eoffset;
|
||
#ifdef PRECOMPUTE_SELECTORS
|
||
union sofftype xx;
|
||
xx.idx = index;
|
||
#ifdef OBJC_SPARSE3
|
||
ioffset = xx.off.ioffset;
|
||
#endif
|
||
boffset = xx.off.boffset;
|
||
eoffset = xx.off.eoffset;
|
||
#else /* not PRECOMPUTE_SELECTORS */
|
||
#ifdef OBJC_SPARSE3
|
||
ioffset = index/INDEX_CAPACITY;
|
||
boffset = (index/BUCKET_SIZE)%INDEX_SIZE;
|
||
eoffset = index%BUCKET_SIZE;
|
||
#else
|
||
boffset = index/BUCKET_SIZE;
|
||
eoffset = index%BUCKET_SIZE;
|
||
#endif
|
||
#endif /* not PRECOMPUTE_SELECTORS */
|
||
|
||
assert(soffset_decode(index) < array->capacity); /* Range check */
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
the_index = &(array->indices[ioffset]);
|
||
the_bucket = &((*the_index)->buckets[boffset]);
|
||
#else
|
||
the_bucket = &(array->buckets[boffset]);
|
||
#endif
|
||
|
||
if ((*the_bucket)->elems[eoffset] == element)
|
||
return; /* great! we just avoided a lazy copy */
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
|
||
/* First, perform lazy copy/allocation of index if needed */
|
||
|
||
if ((*the_index) == array->empty_index) {
|
||
|
||
/* The index was previously empty, allocate a new */
|
||
*the_index = (struct sindex*)__objc_xmalloc(sizeof(struct sindex));
|
||
memcpy(*the_index, array->empty_index, sizeof(struct sindex));
|
||
(*the_index)->version = array->version;
|
||
the_bucket = &((*the_index)->buckets[boffset]);
|
||
nindices += 1;
|
||
|
||
} else if ((*the_index)->version != array->version) {
|
||
|
||
/* This index must be lazy copied */
|
||
struct sindex* old_index = *the_index;
|
||
*the_index = (struct sindex*)__objc_xmalloc(sizeof(struct sindex));
|
||
memcpy( *the_index,old_index, sizeof(struct sindex));
|
||
(*the_index)->version = array->version;
|
||
the_bucket = &((*the_index)->buckets[boffset]);
|
||
nindices += 1;
|
||
|
||
}
|
||
|
||
#endif /* OBJC_SPARSE3 */
|
||
|
||
/* next, perform lazy allocation/copy of the bucket if needed */
|
||
|
||
if ((*the_bucket) == array->empty_bucket) {
|
||
|
||
/* The bucket was previously empty (or something like that), */
|
||
/* allocate a new. This is the effect of `lazy' allocation */
|
||
*the_bucket = (struct sbucket*)__objc_xmalloc(sizeof(struct sbucket));
|
||
memcpy((void *) *the_bucket, (const void*)array->empty_bucket, sizeof(struct sbucket));
|
||
(*the_bucket)->version = array->version;
|
||
nbuckets += 1;
|
||
|
||
} else if ((*the_bucket)->version != array->version) {
|
||
|
||
/* Perform lazy copy. */
|
||
struct sbucket* old_bucket = *the_bucket;
|
||
*the_bucket = (struct sbucket*)__objc_xmalloc(sizeof(struct sbucket));
|
||
memcpy( *the_bucket,old_bucket, sizeof(struct sbucket));
|
||
(*the_bucket)->version = array->version;
|
||
nbuckets += 1;
|
||
|
||
}
|
||
(*the_bucket)->elems[eoffset] = element;
|
||
}
|
||
|
||
void
|
||
sarray_at_put_safe(struct sarray* array, sidx index, void* element)
|
||
{
|
||
if(soffset_decode(index) >= array->capacity)
|
||
sarray_realloc(array, soffset_decode(index)+1);
|
||
sarray_at_put(array, index, element);
|
||
}
|
||
|
||
struct sarray*
|
||
sarray_new (int size, void* default_element)
|
||
{
|
||
#ifdef OBJC_SPARSE3
|
||
size_t num_indices = ((size-1)/(INDEX_CAPACITY))+1;
|
||
#else /* OBJC_SPARSE2 */
|
||
size_t num_indices = ((size-1)/BUCKET_SIZE)+1;
|
||
#endif
|
||
int counter;
|
||
struct sarray* arr;
|
||
|
||
assert(size > 0);
|
||
|
||
/* Allocate core array */
|
||
arr = (struct sarray*) __objc_xmalloc(sizeof(struct sarray));
|
||
arr->version = 0;
|
||
narrays += 1;
|
||
|
||
/* Initialize members */
|
||
#ifdef OBJC_SPARSE3
|
||
arr->capacity = num_indices*INDEX_CAPACITY;
|
||
arr->indices = (struct sindex**)
|
||
__objc_xmalloc(sizeof(struct sindex*)*num_indices);
|
||
idxsize += num_indices;
|
||
|
||
arr->empty_index = (struct sindex*) __objc_xmalloc(sizeof(struct sindex));
|
||
arr->empty_index->version = 0;
|
||
nindices += 1;
|
||
|
||
#else /* OBJC_SPARSE2 */
|
||
arr->capacity = num_indices*BUCKET_SIZE;
|
||
arr->buckets = (struct sbucket**)
|
||
__objc_xmalloc(sizeof(struct sbucket*)*num_indices);
|
||
idxsize += num_indices;
|
||
|
||
#endif
|
||
|
||
arr->empty_bucket = (struct sbucket*) __objc_xmalloc(sizeof(struct sbucket));
|
||
arr->empty_bucket->version = 0;
|
||
nbuckets += 1;
|
||
|
||
arr->ref_count = 1;
|
||
arr->is_copy_of = (struct sarray*)0;
|
||
|
||
for (counter=0; counter<BUCKET_SIZE; counter++)
|
||
arr->empty_bucket->elems[counter] = default_element;
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
for (counter=0; counter<INDEX_SIZE; counter++)
|
||
arr->empty_index->buckets[counter] = arr->empty_bucket;
|
||
|
||
for (counter=0; counter<num_indices; counter++)
|
||
arr->indices[counter] = arr->empty_index;
|
||
|
||
#else /* OBJC_SPARSE2 */
|
||
|
||
for (counter=0; counter<num_indices; counter++)
|
||
arr->buckets[counter] = arr->empty_bucket;
|
||
|
||
#endif
|
||
|
||
return arr;
|
||
}
|
||
|
||
|
||
/* Reallocate the sparse array to hold `newsize' entries */
|
||
|
||
void
|
||
sarray_realloc(struct sarray* array, int newsize)
|
||
{
|
||
#ifdef OBJC_SPARSE3
|
||
size_t old_max_index = (array->capacity-1)/INDEX_CAPACITY;
|
||
size_t new_max_index = ((newsize-1)/INDEX_CAPACITY);
|
||
size_t rounded_size = (new_max_index+1)*INDEX_CAPACITY;
|
||
|
||
#else /* OBJC_SPARSE2 */
|
||
size_t old_max_index = (array->capacity-1)/BUCKET_SIZE;
|
||
size_t new_max_index = ((newsize-1)/BUCKET_SIZE);
|
||
size_t rounded_size = (new_max_index+1)*BUCKET_SIZE;
|
||
|
||
#endif
|
||
|
||
int counter;
|
||
|
||
assert(newsize > 0);
|
||
|
||
/* The size is the same, just ignore the request */
|
||
if(rounded_size == array->capacity)
|
||
return;
|
||
|
||
assert(array->ref_count == 1); /* stop if lazy copied... */
|
||
|
||
if(rounded_size < array->capacity)
|
||
{
|
||
/* update capacity */
|
||
array->capacity = rounded_size;
|
||
|
||
/* free buckets above new_max_index */
|
||
for(counter = old_max_index; counter > new_max_index; counter-- ) {
|
||
#ifdef OBJC_SPARSE3
|
||
struct sindex* idx = array->indices[counter];
|
||
if((idx != array->empty_index) && (idx->version == array->version)) {
|
||
int c2;
|
||
for(c2=0; c2<INDEX_SIZE; c2++) {
|
||
struct sbucket* bkt = idx->buckets[c2];
|
||
if((bkt != array->empty_bucket) && (bkt->version == array->version))
|
||
{
|
||
free(bkt);
|
||
nbuckets -= 1;
|
||
}
|
||
}
|
||
free(idx);
|
||
nindices -= 1;
|
||
}
|
||
#else /* OBJC_SPARSE2 */
|
||
struct sbucket* bkt = array->buckets[counter];
|
||
if ((bkt != array->empty_bucket) && (bkt->version == array->version))
|
||
{
|
||
free(bkt);
|
||
nbuckets -= 1;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
/* realloc to free the space above new_max_index */
|
||
array->indices = (struct sindex**)
|
||
__objc_xrealloc(array->indices,
|
||
(new_max_index+1)*sizeof(struct sindex*));
|
||
#else /* OBJC_SPARSE2 */
|
||
array->buckets = (struct sbucket**)
|
||
__objc_xrealloc(array->buckets,
|
||
(new_max_index+1)*sizeof(struct sbucket*));
|
||
#endif
|
||
idxsize -= (old_max_index-new_max_index);
|
||
|
||
return;
|
||
}
|
||
|
||
/* We are asked to extend the array -- reallocate the bucket table, */
|
||
/* and insert empty_bucket in newly allocated places. */
|
||
if(rounded_size > array->capacity)
|
||
{
|
||
/* update capacity */
|
||
array->capacity = rounded_size;
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
/* realloc to make room in table above old_max_index */
|
||
array->indices = (struct sindex**)
|
||
__objc_xrealloc(array->indices,
|
||
(new_max_index+1)*sizeof(struct sindex*));
|
||
|
||
/* reset entries above old_max_index to empty_bucket */
|
||
for(counter = old_max_index+1; counter <= new_max_index; counter++)
|
||
array->indices[counter] = array->empty_index;
|
||
|
||
#else /* OBJC_SPARSE2 */
|
||
|
||
/* realloc to make room in table above old_max_index */
|
||
array->buckets = (struct sbucket**)
|
||
__objc_xrealloc(array->buckets,
|
||
(new_max_index+1)*sizeof(struct sbucket*));
|
||
|
||
/* reset entries above old_max_index to empty_bucket */
|
||
for(counter = old_max_index+1; counter <= new_max_index; counter++)
|
||
array->buckets[counter] = array->empty_bucket;
|
||
|
||
#endif
|
||
idxsize += (new_max_index-old_max_index);
|
||
return;
|
||
}
|
||
}
|
||
|
||
|
||
/* Free a sparse array allocated with sarray_new */
|
||
|
||
void
|
||
sarray_free(struct sarray* array) {
|
||
#ifdef OBJC_SPARSE3
|
||
size_t old_max_index = (array->capacity-1)/INDEX_CAPACITY;
|
||
#else
|
||
size_t old_max_index = (array->capacity-1)/BUCKET_SIZE;
|
||
#endif
|
||
int counter = 0;
|
||
|
||
assert(array->ref_count != 0); /* Freed multiple times!!! */
|
||
|
||
if(--(array->ref_count) != 0) /* There exists copies of me */
|
||
return;
|
||
|
||
if((array->is_copy_of) && ((array->is_copy_of->ref_count - 1) == 0))
|
||
sarray_free(array->is_copy_of);
|
||
|
||
/* Free all entries that do not point to empty_bucket */
|
||
for(counter = 0; counter <= old_max_index; counter++ ) {
|
||
#ifdef OBJC_SPARSE3
|
||
struct sindex* idx = array->indices[counter];
|
||
if((idx != array->empty_index) && (idx->version == array->version)) {
|
||
int c2;
|
||
for(c2=0; c2<INDEX_SIZE; c2++) {
|
||
struct sbucket* bkt = idx->buckets[c2];
|
||
if((bkt != array->empty_bucket) && (bkt->version == array->version))
|
||
{
|
||
free(bkt);
|
||
nbuckets -= 1;
|
||
}
|
||
}
|
||
free(idx);
|
||
nindices -= 1;
|
||
}
|
||
#else /* OBJC_SPARSE2 */
|
||
struct sbucket* bkt = array->buckets[counter];
|
||
if ((bkt != array->empty_bucket) && (bkt->version == array->version))
|
||
{
|
||
free(bkt);
|
||
nbuckets -= 1;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
/* free empty_index */
|
||
if(array->empty_index->version == array->version) {
|
||
free(array->empty_index);
|
||
nindices -= 1;
|
||
}
|
||
#endif
|
||
|
||
/* free empty_bucket */
|
||
if(array->empty_bucket->version == array->version) {
|
||
free(array->empty_bucket);
|
||
nbuckets -= 1;
|
||
}
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
/* free bucket table */
|
||
free(array->indices);
|
||
idxsize -= (old_max_index+1);
|
||
|
||
#else
|
||
/* free bucket table */
|
||
free(array->buckets);
|
||
idxsize -= (old_max_index+1);
|
||
|
||
#endif
|
||
|
||
/* free array */
|
||
free(array);
|
||
narrays -= 1;
|
||
}
|
||
|
||
/* This is a lazy copy. Only the core of the structure is actually */
|
||
/* copied. */
|
||
|
||
struct sarray*
|
||
sarray_lazy_copy(struct sarray* oarr)
|
||
{
|
||
#ifdef OBJC_SPARSE3
|
||
size_t num_indices = ((oarr->capacity-1)/INDEX_CAPACITY)+1;
|
||
#else /* OBJC_SPARSE2 */
|
||
size_t num_indices = ((oarr->capacity-1)/BUCKET_SIZE)+1;
|
||
#endif
|
||
struct sarray* arr;
|
||
|
||
/* Allocate core array */
|
||
arr = (struct sarray*) __objc_xmalloc(sizeof(struct sarray));
|
||
memcpy( arr,oarr, sizeof(struct sarray));
|
||
arr->version = oarr->version + 1;
|
||
arr->is_copy_of = oarr;
|
||
oarr->ref_count += 1;
|
||
arr->ref_count = 1;
|
||
|
||
#ifdef OBJC_SPARSE3
|
||
/* Copy bucket table */
|
||
arr->indices = (struct sindex**)
|
||
__objc_xmalloc(sizeof(struct sindex*)*num_indices);
|
||
memcpy( arr->indices,oarr->indices,
|
||
sizeof(struct sindex*)*num_indices);
|
||
#else
|
||
/* Copy bucket table */
|
||
arr->buckets = (struct sbucket**)
|
||
__objc_xmalloc(sizeof(struct sbucket*)*num_indices);
|
||
memcpy( arr->buckets,oarr->buckets,
|
||
sizeof(struct sbucket*)*num_indices);
|
||
#endif
|
||
|
||
idxsize += num_indices;
|
||
narrays += 1;
|
||
|
||
return arr;
|
||
}
|