/* Functions to support a pool of allocatable objects.
- Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2003
+ Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007
Free Software Foundation, Inc.
Contributed by Daniel Berlin <dan@cgsoftware.com>
GCC 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
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "alloc-pool.h"
-
-/* Redefine abort to report an internal error w/o coredump, and
- reporting the location of the error in the source file. This logic
- is duplicated in rtl.h and tree.h because every file that needs the
- special abort includes one or both. toplev.h gets too few files,
- system.h gets too many. */
-
-extern void fancy_abort (const char *, int, const char *)
- ATTRIBUTE_NORETURN;
-#define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
+#include "hashtab.h"
#define align_eight(x) (((x+7) >> 3) << 3)
static ALLOC_POOL_ID_TYPE last_id;
#endif
+#ifdef GATHER_STATISTICS
+
+/* Store information about each particular alloc_pool. */
+struct alloc_pool_descriptor
+{
+ const char *name;
+ int allocated;
+ int created;
+ int peak;
+ int current;
+};
+
+/* Hashtable mapping alloc_pool names to descriptors. */
+static htab_t alloc_pool_hash;
+
+/* Hashtable helpers. */
+static hashval_t
+hash_descriptor (const void *p)
+{
+ const struct alloc_pool_descriptor *d = p;
+ return htab_hash_pointer (d->name);
+}
+static int
+eq_descriptor (const void *p1, const void *p2)
+{
+ const struct alloc_pool_descriptor *d = p1;
+ return d->name == p2;
+}
+
+/* For given name, return descriptor, create new if needed. */
+static struct alloc_pool_descriptor *
+alloc_pool_descriptor (const char *name)
+{
+ struct alloc_pool_descriptor **slot;
+
+ if (!alloc_pool_hash)
+ alloc_pool_hash = htab_create (10, hash_descriptor, eq_descriptor, NULL);
+
+ slot = (struct alloc_pool_descriptor **)
+ htab_find_slot_with_hash (alloc_pool_hash, name,
+ htab_hash_pointer (name),
+ 1);
+ if (*slot)
+ return *slot;
+ *slot = xcalloc (sizeof (**slot), 1);
+ (*slot)->name = name;
+ return *slot;
+}
+#endif
+
/* Create a pool of things of size SIZE, with NUM in each block we
allocate. */
{
alloc_pool pool;
size_t pool_size, header_size;
+#ifdef GATHER_STATISTICS
+ struct alloc_pool_descriptor *desc;
+#endif
- if (!name)
- abort ();
+ gcc_assert (name);
/* Make size large enough to store the list header. */
if (size < sizeof (alloc_pool_list))
#endif
/* Um, we can't really allocate 0 elements per block. */
- if (num == 0)
- abort ();
+ gcc_assert (num);
/* Find the size of the pool structure, and the name. */
pool_size = sizeof (struct alloc_pool_def);
pool = xmalloc (pool_size);
/* Now init the various pieces of our pool structure. */
- pool->name = xstrdup (name);
+ pool->name = /*xstrdup (name)*/name;
+#ifdef GATHER_STATISTICS
+ desc = alloc_pool_descriptor (name);
+ desc->created++;
+#endif
pool->elt_size = size;
pool->elts_per_block = num;
header_size = align_eight (sizeof (struct alloc_pool_list_def));
pool->block_size = (size * num) + header_size;
- pool->free_list = NULL;
+ pool->returned_free_list = NULL;
+ pool->virgin_free_list = NULL;
+ pool->virgin_elts_remaining = 0;
pool->elts_allocated = 0;
pool->elts_free = 0;
pool->blocks_allocated = 0;
/* Free all memory allocated for the given memory pool. */
void
-free_alloc_pool (alloc_pool pool)
+empty_alloc_pool (alloc_pool pool)
{
alloc_pool_list block, next_block;
-
-#ifdef ENABLE_CHECKING
- if (!pool)
- abort ();
+#ifdef GATHER_STATISTICS
+ struct alloc_pool_descriptor *desc = alloc_pool_descriptor (pool->name);
#endif
+ gcc_assert (pool);
+
/* Free each block allocated to the pool. */
for (block = pool->block_list; block != NULL; block = next_block)
{
next_block = block->next;
free (block);
+#ifdef GATHER_STATISTICS
+ desc->current -= pool->block_size;
+#endif
}
- /* Lastly, free the pool and the name. */
- free (pool->name);
+
+ pool->returned_free_list = NULL;
+ pool->virgin_free_list = NULL;
+ pool->virgin_elts_remaining = 0;
+ pool->elts_allocated = 0;
+ pool->elts_free = 0;
+ pool->blocks_allocated = 0;
+ pool->block_list = NULL;
+}
+
+/* Free all memory allocated for the given memory pool and the pool itself. */
+void
+free_alloc_pool (alloc_pool pool)
+{
+ /* First empty the pool. */
+ empty_alloc_pool (pool);
#ifdef ENABLE_CHECKING
memset (pool, 0xaf, sizeof (*pool));
#endif
+ /* Lastly, free the pool. */
free (pool);
}
+/* Frees the alloc_pool, if it is empty and zero *POOL in this case. */
+void
+free_alloc_pool_if_empty (alloc_pool *pool)
+{
+ if ((*pool)->elts_free == (*pool)->elts_allocated)
+ {
+ free_alloc_pool (*pool);
+ *pool = NULL;
+ }
+}
+
/* Allocates one element from the pool specified. */
void *
pool_alloc (alloc_pool pool)
{
alloc_pool_list header;
- char *block;
+#ifdef GATHER_STATISTICS
+ struct alloc_pool_descriptor *desc = alloc_pool_descriptor (pool->name);
-#ifdef ENABLE_CHECKING
- if (!pool)
- abort ();
+ desc->allocated+=pool->elt_size;
#endif
+ gcc_assert (pool);
+
/* If there are no more free elements, make some more!. */
- if (!pool->free_list)
+ if (!pool->returned_free_list)
{
- size_t i;
- alloc_pool_list block_header;
-
- /* Make the block. */
- block = xmalloc (pool->block_size);
- block_header = (alloc_pool_list) block;
- block += align_eight (sizeof (struct alloc_pool_list_def));
-
- /* Throw it on the block list. */
- block_header->next = pool->block_list;
- pool->block_list = block_header;
-
- /* Now put the actual block pieces onto the free list. */
- for (i = 0; i < pool->elts_per_block; i++, block += pool->elt_size)
- {
+ char *block;
+ if (!pool->virgin_elts_remaining)
+ {
+ alloc_pool_list block_header;
+
+ /* Make the block. */
+ block = XNEWVEC (char, pool->block_size);
+ block_header = (alloc_pool_list) block;
+ block += align_eight (sizeof (struct alloc_pool_list_def));
+#ifdef GATHER_STATISTICS
+ desc->current += pool->block_size;
+ if (desc->peak < desc->current)
+ desc->peak = desc->current;
+#endif
+
+ /* Throw it on the block list. */
+ block_header->next = pool->block_list;
+ pool->block_list = block_header;
+
+ /* Make the block available for allocation. */
+ pool->virgin_free_list = block;
+ pool->virgin_elts_remaining = pool->elts_per_block;
+
+ /* Also update the number of elements we have free/allocated, and
+ increment the allocated block count. */
+ pool->elts_allocated += pool->elts_per_block;
+ pool->elts_free += pool->elts_per_block;
+ pool->blocks_allocated += 1;
+ }
+
+
+ /* We now know that we can take the first elt off the virgin list and
+ put it on the returned list. */
+ block = pool->virgin_free_list;
+ header = (alloc_pool_list) USER_PTR_FROM_ALLOCATION_OBJECT_PTR (block);
+ header->next = NULL;
#ifdef ENABLE_CHECKING
- /* Mark the element to be free. */
- ((allocation_object *) block)->id = 0;
-#endif
- header = (alloc_pool_list) USER_PTR_FROM_ALLOCATION_OBJECT_PTR (block);
- header->next = pool->free_list;
- pool->free_list = header;
- }
- /* Also update the number of elements we have free/allocated, and
- increment the allocated block count. */
- pool->elts_allocated += pool->elts_per_block;
- pool->elts_free += pool->elts_per_block;
- pool->blocks_allocated += 1;
+ /* Mark the element to be free. */
+ ((allocation_object *) block)->id = 0;
+#endif
+ pool->returned_free_list = header;
+ pool->virgin_free_list += pool->elt_size;
+ pool->virgin_elts_remaining--;
+
}
/* Pull the first free element from the free list, and return it. */
- header = pool->free_list;
- pool->free_list = header->next;
+ header = pool->returned_free_list;
+ pool->returned_free_list = header->next;
pool->elts_free--;
#ifdef ENABLE_CHECKING
{
alloc_pool_list header;
+ gcc_assert (ptr);
+
#ifdef ENABLE_CHECKING
- if (!ptr)
- abort ();
+ /* Check whether the PTR was allocated from POOL. */
+ gcc_assert (pool->id == ALLOCATION_OBJECT_PTR_FROM_USER_PTR (ptr)->id);
memset (ptr, 0xaf, pool->elt_size - offsetof (allocation_object, u.data));
- /* Check whether the PTR was allocated from POOL. */
- if (pool->id != ALLOCATION_OBJECT_PTR_FROM_USER_PTR (ptr)->id)
- abort ();
-
/* Mark the element to be free. */
ALLOCATION_OBJECT_PTR_FROM_USER_PTR (ptr)->id = 0;
#else
/* Check if we free more than we allocated, which is Bad (TM). */
- if (pool->elts_free + 1 > pool->elts_allocated)
- abort ();
+ gcc_assert (pool->elts_free < pool->elts_allocated);
#endif
header = (alloc_pool_list) ptr;
- header->next = pool->free_list;
- pool->free_list = header;
+ header->next = pool->returned_free_list;
+ pool->returned_free_list = header;
pool->elts_free++;
}
+/* Output per-alloc_pool statistics. */
+#ifdef GATHER_STATISTICS
+
+/* Used to accumulate statistics about alloc_pool sizes. */
+struct output_info
+{
+ int count;
+ int size;
+};
+
+/* Called via htab_traverse. Output alloc_pool descriptor pointed out by SLOT
+ and update statistics. */
+static int
+print_statistics (void **slot, void *b)
+{
+ struct alloc_pool_descriptor *d = (struct alloc_pool_descriptor *) *slot;
+ struct output_info *i = (struct output_info *) b;
+
+ if (d->allocated)
+ {
+ fprintf (stderr, "%-21s %6d %10d %10d %10d\n", d->name,
+ d->created, d->allocated, d->peak, d->current);
+ i->size += d->allocated;
+ i->count += d->created;
+ }
+ return 1;
+}
+#endif
+
+/* Output per-alloc_pool memory usage statistics. */
+void
+dump_alloc_pool_statistics (void)
+{
+#ifdef GATHER_STATISTICS
+ struct output_info info;
+
+ if (!alloc_pool_hash)
+ return;
+
+ fprintf (stderr, "\nAlloc-pool Kind Pools Allocated Peak Leak\n");
+ fprintf (stderr, "-------------------------------------------------------------\n");
+ info.count = 0;
+ info.size = 0;
+ htab_traverse (alloc_pool_hash, print_statistics, &info);
+ fprintf (stderr, "-------------------------------------------------------------\n");
+ fprintf (stderr, "%-20s %7d %10d\n",
+ "Total", info.count, info.size);
+ fprintf (stderr, "-------------------------------------------------------------\n");
+#endif
+}