/* Functions to support a pool of allocatable objects.
- Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2003, 2004
- Free Software Foundation, Inc.
+ Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006,
+ 2007, 2008 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dan@cgsoftware.com>
This file is part of GCC.
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"
#include "hashtab.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__)
-
#define align_eight(x) (((x+7) >> 3) << 3)
/* The internal allocation object. */
#ifdef GATHER_STATISTICS
-/* Store infromation about each particular alloc_pool. */
+/* Store information about each particular alloc_pool. Note that this
+ will underestimate the amount the amount of storage used by a small amount:
+ 1) The overhead in a pool is not accounted for.
+ 2) The unallocated elements in a block are not accounted for. Note
+ that this can at worst case be one element smaller that the block
+ size for that pool. */
struct alloc_pool_descriptor
{
const char *name;
- int allocated;
- int created;
- int peak;
- int current;
+ /* Number of pools allocated. */
+ unsigned long created;
+ /* Gross allocated storage. */
+ unsigned long allocated;
+ /* Amount of currently active storage. */
+ unsigned long current;
+ /* Peak amount of storage used. */
+ unsigned long peak;
+ /* Size of element in the pool. */
+ int elt_size;
};
/* Hashtable mapping alloc_pool names to descriptors. */
static hashval_t
hash_descriptor (const void *p)
{
- const struct alloc_pool_descriptor *d = p;
+ const struct alloc_pool_descriptor *const d =
+ (const struct alloc_pool_descriptor * )p;
return htab_hash_pointer (d->name);
}
static int
eq_descriptor (const void *p1, const void *p2)
{
- const struct alloc_pool_descriptor *d = p1;
+ const struct alloc_pool_descriptor *const d =
+ (const struct alloc_pool_descriptor *) p1;
return d->name == p2;
}
slot = (struct alloc_pool_descriptor **)
htab_find_slot_with_hash (alloc_pool_hash, name,
- htab_hash_pointer (name),
- 1);
+ htab_hash_pointer (name),
+ INSERT);
if (*slot)
return *slot;
- *slot = xcalloc (sizeof (**slot), 1);
+ *slot = XCNEW (struct alloc_pool_descriptor);
(*slot)->name = name;
return *slot;
}
create_alloc_pool (const char *name, size_t size, size_t num)
{
alloc_pool pool;
- size_t pool_size, header_size;
+ size_t 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 ();
-
- /* Find the size of the pool structure, and the name. */
- pool_size = sizeof (struct alloc_pool_def);
+ gcc_assert (num);
- /* and allocate that much memory. */
- pool = xmalloc (pool_size);
+ /* Allocate memory for the pool structure. */
+ pool = XNEW (struct alloc_pool_def);
/* Now init the various pieces of our pool structure. */
pool->name = /*xstrdup (name)*/name;
#ifdef GATHER_STATISTICS
desc = alloc_pool_descriptor (name);
+ desc->elt_size = size;
desc->created++;
#endif
pool->elt_size = size;
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 GATHER_STATISTICS
struct alloc_pool_descriptor *desc = alloc_pool_descriptor (pool->name);
#endif
-#ifdef ENABLE_CHECKING
- if (!pool)
- abort ();
-#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;
+ desc->current -= (pool->elts_allocated - pool->elts_free) * pool->elt_size;
#endif
- }
+ 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
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);
- desc->allocated+=pool->elt_size;
+ desc->allocated += pool->elt_size;
+ desc->current += pool->elt_size;
+ if (desc->peak < desc->current)
+ desc->peak = desc->current;
#endif
-#ifdef ENABLE_CHECKING
- if (!pool)
- abort ();
-#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));
-#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;
-
- /* 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));
+
+ /* 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;
+ /* 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;
+ 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
pool_free (alloc_pool pool, void *ptr)
{
alloc_pool_list header;
+#ifdef GATHER_STATISTICS
+ struct alloc_pool_descriptor *desc = alloc_pool_descriptor (pool->name);
+#endif
+
+ 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++;
+
+#ifdef GATHER_STATISTICS
+ desc->current -= pool->elt_size;
+#endif
+
}
/* Output per-alloc_pool statistics. */
#ifdef GATHER_STATISTICS
/* Used to accumulate statistics about alloc_pool sizes. */
struct output_info
{
- int count;
- int size;
+ unsigned long total_created;
+ unsigned long total_allocated;
};
/* Called via htab_traverse. Output alloc_pool descriptor pointed out by SLOT
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;
+ fprintf (stderr, "%-22s %6d %10lu %10lu(%10lu) %10lu(%10lu) %10lu(%10lu)\n", d->name,
+ d->elt_size, d->created, d->allocated, d->allocated / d->elt_size,
+ d->peak, d->peak / d->elt_size,
+ d->current, d->current / d->elt_size);
+ i->total_allocated += d->allocated;
+ i->total_created += d->created;
}
return 1;
}
#endif
/* Output per-alloc_pool memory usage statistics. */
-void dump_alloc_pool_statistics (void)
+void
+dump_alloc_pool_statistics (void)
{
#ifdef GATHER_STATISTICS
struct output_info info;
- fprintf (stderr, "\nAlloc-pool Kind Pools Allocated Peak Leak\n");
- fprintf (stderr, "-------------------------------------------------------------\n");
- info.count = 0;
- info.size = 0;
+ if (!alloc_pool_hash)
+ return;
+
+ fprintf (stderr, "\nAlloc-pool Kind Elt size Pools Allocated (elts) Peak (elts) Leak (elts)\n");
+ fprintf (stderr, "--------------------------------------------------------------------------------------------------------------\n");
+ info.total_created = 0;
+ info.total_allocated = 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");
+ fprintf (stderr, "--------------------------------------------------------------------------------------------------------------\n");
+ fprintf (stderr, "%-22s %7lu %10lu\n",
+ "Total", info.total_created, info.total_allocated);
+ fprintf (stderr, "--------------------------------------------------------------------------------------------------------------\n");
#endif
}
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