diff options
author | Marc Espie <espie@cvs.openbsd.org> | 1999-05-26 13:38:57 +0000 |
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committer | Marc Espie <espie@cvs.openbsd.org> | 1999-05-26 13:38:57 +0000 |
commit | 0126e157b87f137fc08dc7f46f6c291b9d06ac5d (patch) | |
tree | f8555e3e504eb82b4cd3cba5cec20ae4ce8124ff /gnu/egcs/libobjc/sarray.c | |
parent | ff8e9a4356e55ed142306c3a375fa280800abc86 (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.c | 522 |
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; +} |