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authorMarc Espie <espie@cvs.openbsd.org>1999-05-26 13:38:57 +0000
committerMarc Espie <espie@cvs.openbsd.org>1999-05-26 13:38:57 +0000
commit0126e157b87f137fc08dc7f46f6c291b9d06ac5d (patch)
treef8555e3e504eb82b4cd3cba5cec20ae4ce8124ff /gnu/egcs/libobjc/sarray.c
parentff8e9a4356e55ed142306c3a375fa280800abc86 (diff)
egcs projects compiler system
Exact copy of the snapshot, except for the removal of texinfo/ gcc/ch/ libchill/
Diffstat (limited to 'gnu/egcs/libobjc/sarray.c')
-rw-r--r--gnu/egcs/libobjc/sarray.c522
1 files changed, 522 insertions, 0 deletions
diff --git a/gnu/egcs/libobjc/sarray.c b/gnu/egcs/libobjc/sarray.c
new file mode 100644
index 00000000000..f5ace10bf09
--- /dev/null
+++ b/gnu/egcs/libobjc/sarray.c
@@ -0,0 +1,522 @@
+/* Sparse Arrays for Objective C dispatch tables
+ Copyright (C) 1993, 1995, 1996 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 "sarray.h"
+#include "runtime.h"
+#include <stdio.h>
+#include "assert.h"
+
+int nbuckets = 0; /* !T:MUTEX */
+int nindices = 0; /* !T:MUTEX */
+int narrays = 0; /* !T:MUTEX */
+int idxsize = 0; /* !T:MUTEX */
+
+static void * first_free_data = NULL; /* !T:MUTEX */
+
+#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);
+#endif
+
+/* This function removes any structures left over from free operations
+ that were not safe in a multi-threaded environment. */
+void
+sarray_remove_garbage(void)
+{
+ void **vp;
+ void *np;
+
+ objc_mutex_lock(__objc_runtime_mutex);
+
+ vp = first_free_data;
+ first_free_data = NULL;
+
+ while (vp) {
+ np = *vp;
+ objc_free(vp);
+ vp = np;
+ }
+
+ objc_mutex_unlock(__objc_runtime_mutex);
+}
+
+/* Free a block of dynamically allocated memory. If we are in multi-threaded
+ mode, it is ok to free it. If not, we add it to the garbage heap to be
+ freed later. */
+
+static void
+sarray_free_garbage(void *vp)
+{
+ objc_mutex_lock(__objc_runtime_mutex);
+
+ if (__objc_runtime_threads_alive == 1) {
+ objc_free(vp);
+ if (first_free_data)
+ sarray_remove_garbage();
+ }
+ else {
+ *(void **)vp = first_free_data;
+ first_free_data = vp;
+ }
+
+ objc_mutex_unlock(__objc_runtime_mutex);
+}
+
+/* sarray_at_put : copies data in such a way as to be thread reader safe. */
+void
+sarray_at_put(struct sarray* array, sidx index, void* element)
+{
+#ifdef OBJC_SPARSE3
+ struct sindex** the_index;
+ struct sindex* new_index;
+#endif
+ struct sbucket** the_bucket;
+ struct sbucket* new_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 */
+ new_index = (struct sindex*)objc_malloc(sizeof(struct sindex));
+ memcpy(new_index, array->empty_index, sizeof(struct sindex));
+ new_index->version.version = array->version.version;
+ *the_index = new_index; /* Prepared for install. */
+ the_bucket = &((*the_index)->buckets[boffset]);
+
+ nindices += 1;
+ } else if ((*the_index)->version.version != array->version.version) {
+
+ /* This index must be lazy copied */
+ struct sindex* old_index = *the_index;
+ new_index = (struct sindex*)objc_malloc(sizeof(struct sindex));
+ memcpy( new_index, old_index, sizeof(struct sindex));
+ new_index->version.version = array->version.version;
+ *the_index = new_index; /* Prepared for install. */
+ 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 */
+ new_bucket = (struct sbucket*)objc_malloc(sizeof(struct sbucket));
+ memcpy((void *) new_bucket, (const void*)array->empty_bucket,
+ sizeof(struct sbucket));
+ new_bucket->version.version = array->version.version;
+ *the_bucket = new_bucket; /* Prepared for install. */
+
+ nbuckets += 1;
+
+ } else if ((*the_bucket)->version.version != array->version.version) {
+
+ /* Perform lazy copy. */
+ struct sbucket* old_bucket = *the_bucket;
+ new_bucket = (struct sbucket*)objc_malloc(sizeof(struct sbucket));
+ memcpy( new_bucket, old_bucket, sizeof(struct sbucket));
+ new_bucket->version.version = array->version.version;
+ *the_bucket = new_bucket; /* Prepared for install. */
+
+ 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)
+{
+ struct sarray* arr;
+#ifdef OBJC_SPARSE3
+ size_t num_indices = ((size-1)/(INDEX_CAPACITY))+1;
+ struct sindex ** new_indices;
+#else /* OBJC_SPARSE2 */
+ size_t num_indices = ((size-1)/BUCKET_SIZE)+1;
+ struct sbucket ** new_buckets;
+#endif
+ int counter;
+
+ assert(size > 0);
+
+ /* Allocate core array */
+ arr = (struct sarray*) objc_malloc(sizeof(struct sarray));
+ arr->version.version = 0;
+
+ /* Initialize members */
+#ifdef OBJC_SPARSE3
+ arr->capacity = num_indices*INDEX_CAPACITY;
+ new_indices = (struct sindex**)
+ objc_malloc(sizeof(struct sindex*)*num_indices);
+
+ arr->empty_index = (struct sindex*) objc_malloc(sizeof(struct sindex));
+ arr->empty_index->version.version = 0;
+
+ narrays += 1;
+ idxsize += num_indices;
+ nindices += 1;
+
+#else /* OBJC_SPARSE2 */
+ arr->capacity = num_indices*BUCKET_SIZE;
+ new_buckets = (struct sbucket**)
+ objc_malloc(sizeof(struct sbucket*)*num_indices);
+
+ narrays += 1;
+ idxsize += num_indices;
+
+#endif
+
+ arr->empty_bucket = (struct sbucket*) objc_malloc(sizeof(struct sbucket));
+ arr->empty_bucket->version.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++)
+ new_indices[counter] = arr->empty_index;
+
+#else /* OBJC_SPARSE2 */
+
+ for (counter=0; counter<num_indices; counter++)
+ new_buckets[counter] = arr->empty_bucket;
+
+#endif
+
+#ifdef OBJC_SPARSE3
+ arr->indices = new_indices;
+#else /* OBJC_SPARSE2 */
+ arr->buckets = new_buckets;
+#endif
+
+ return arr;
+}
+
+
+/* Reallocate the sparse array to hold `newsize' entries
+ Note: We really allocate and then free. We have to do this to ensure that
+ any concurrent readers notice the update. */
+
+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;
+
+ struct sindex ** new_indices;
+ struct sindex ** old_indices;
+
+#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;
+
+ struct sbucket ** new_buckets;
+ struct sbucket ** old_buckets;
+
+#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... */
+
+ /* We are asked to extend the array -- allocate new bucket table, */
+ /* and insert empty_bucket in newly allocated places. */
+ if(rounded_size > array->capacity)
+ {
+
+#ifdef OBJC_SPARSE3
+ new_max_index += 4;
+ rounded_size = (new_max_index+1)*INDEX_CAPACITY;
+
+#else /* OBJC_SPARSE2 */
+ new_max_index += 4;
+ rounded_size = (new_max_index+1)*BUCKET_SIZE;
+#endif
+
+ /* update capacity */
+ array->capacity = rounded_size;
+
+#ifdef OBJC_SPARSE3
+ /* alloc to force re-read by any concurrent readers. */
+ old_indices = array->indices;
+ new_indices = (struct sindex**)
+ objc_malloc((new_max_index+1)*sizeof(struct sindex*));
+#else /* OBJC_SPARSE2 */
+ old_buckets = array->buckets;
+ new_buckets = (struct sbucket**)
+ objc_malloc((new_max_index+1)*sizeof(struct sbucket*));
+#endif
+
+ /* copy buckets below old_max_index (they are still valid) */
+ for(counter = 0; counter <= old_max_index; counter++ ) {
+#ifdef OBJC_SPARSE3
+ new_indices[counter] = old_indices[counter];
+#else /* OBJC_SPARSE2 */
+ new_buckets[counter] = old_buckets[counter];
+#endif
+ }
+
+#ifdef OBJC_SPARSE3
+ /* reset entries above old_max_index to empty_bucket */
+ for(counter = old_max_index+1; counter <= new_max_index; counter++)
+ new_indices[counter] = array->empty_index;
+#else /* OBJC_SPARSE2 */
+ /* reset entries above old_max_index to empty_bucket */
+ for(counter = old_max_index+1; counter <= new_max_index; counter++)
+ new_buckets[counter] = array->empty_bucket;
+#endif
+
+#ifdef OBJC_SPARSE3
+ /* install the new indices */
+ array->indices = new_indices;
+#else /* OBJC_SPARSE2 */
+ array->buckets = new_buckets;
+#endif
+
+#ifdef OBJC_SPARSE3
+ /* free the old indices */
+ sarray_free_garbage(old_indices);
+#else /* OBJC_SPARSE2 */
+ sarray_free_garbage(old_buckets);
+#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;
+ struct sindex ** old_indices;
+#else
+ size_t old_max_index = (array->capacity-1)/BUCKET_SIZE;
+ struct sbucket ** old_buckets;
+#endif
+ int counter = 0;
+
+ assert(array->ref_count != 0); /* Freed multiple times!!! */
+
+ if(--(array->ref_count) != 0) /* There exists copies of me */
+ return;
+
+#ifdef OBJC_SPARSE3
+ old_indices = array->indices;
+#else
+ old_buckets = array->buckets;
+#endif
+
+ 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 = old_indices[counter];
+ if((idx != array->empty_index) &&
+ (idx->version.version == array->version.version)) {
+ int c2;
+ for(c2=0; c2<INDEX_SIZE; c2++) {
+ struct sbucket* bkt = idx->buckets[c2];
+ if((bkt != array->empty_bucket) &&
+ (bkt->version.version == array->version.version))
+ {
+ sarray_free_garbage(bkt);
+ nbuckets -= 1;
+ }
+ }
+ sarray_free_garbage(idx);
+ nindices -= 1;
+ }
+#else /* OBJC_SPARSE2 */
+ struct sbucket* bkt = array->buckets[counter];
+ if ((bkt != array->empty_bucket) &&
+ (bkt->version.version == array->version.version))
+ {
+ sarray_free_garbage(bkt);
+ nbuckets -= 1;
+ }
+#endif
+ }
+
+#ifdef OBJC_SPARSE3
+ /* free empty_index */
+ if(array->empty_index->version.version == array->version.version) {
+ sarray_free_garbage(array->empty_index);
+ nindices -= 1;
+ }
+#endif
+
+ /* free empty_bucket */
+ if(array->empty_bucket->version.version == array->version.version) {
+ sarray_free_garbage(array->empty_bucket);
+ nbuckets -= 1;
+ }
+ idxsize -= (old_max_index+1);
+ narrays -= 1;
+
+#ifdef OBJC_SPARSE3
+ /* free bucket table */
+ sarray_free_garbage(array->indices);
+
+#else
+ /* free bucket table */
+ sarray_free_garbage(array->buckets);
+
+#endif
+
+ /* free array */
+ sarray_free_garbage(array);
+}
+
+/* This is a lazy copy. Only the core of the structure is actually */
+/* copied. */
+
+struct sarray*
+sarray_lazy_copy(struct sarray* oarr)
+{
+ struct sarray* arr;
+
+#ifdef OBJC_SPARSE3
+ size_t num_indices = ((oarr->capacity-1)/INDEX_CAPACITY)+1;
+ struct sindex ** new_indices;
+#else /* OBJC_SPARSE2 */
+ size_t num_indices = ((oarr->capacity-1)/BUCKET_SIZE)+1;
+ struct sbucket ** new_buckets;
+#endif
+
+ /* Allocate core array */
+ arr = (struct sarray*) objc_malloc(sizeof(struct sarray)); /* !!! */
+ arr->version.version = oarr->version.version + 1;
+#ifdef OBJC_SPARSE3
+ arr->empty_index = oarr->empty_index;
+#endif
+ arr->empty_bucket = oarr->empty_bucket;
+ arr->ref_count = 1;
+ oarr->ref_count += 1;
+ arr->is_copy_of = oarr;
+ arr->capacity = oarr->capacity;
+
+#ifdef OBJC_SPARSE3
+ /* Copy bucket table */
+ new_indices = (struct sindex**)
+ objc_malloc(sizeof(struct sindex*)*num_indices);
+ memcpy( new_indices,oarr->indices,
+ sizeof(struct sindex*)*num_indices);
+ arr->indices = new_indices;
+#else
+ /* Copy bucket table */
+ new_buckets = (struct sbucket**)
+ objc_malloc(sizeof(struct sbucket*)*num_indices);
+ memcpy( new_buckets,oarr->buckets,
+ sizeof(struct sbucket*)*num_indices);
+ arr->buckets = new_buckets;
+#endif
+
+ idxsize += num_indices;
+ narrays += 1;
+
+ return arr;
+}