#define MEM_ALIGN 8
#define MONO_MEMPOOL_PAGESIZE 8192
+#define MONO_MEMPOOL_MINSIZE 512
+
+#ifndef G_LIKELY
+#define G_LIKELY(a) (a)
+#define G_UNLIKELY(a) (a)
+#endif
struct _MonoMemPool {
MonoMemPool *next;
gint rest;
- gpointer pos;
- double pad; /* to assure proper alignment */
+ guint8 *pos, *end;
+ guint32 size;
+ union {
+ double pad; /* to assure proper alignment */
+ guint32 allocated;
+ } d;
};
/**
* Returns: a new memory pool.
*/
MonoMemPool *
-mono_mempool_new ()
+mono_mempool_new (void)
+{
+ return mono_mempool_new_size (MONO_MEMPOOL_PAGESIZE);
+}
+
+MonoMemPool *
+mono_mempool_new_size (int initial_size)
{
- MonoMemPool *pool = g_malloc (MONO_MEMPOOL_PAGESIZE);
+ MonoMemPool *pool;
+ if (initial_size < MONO_MEMPOOL_MINSIZE)
+ initial_size = MONO_MEMPOOL_MINSIZE;
+ pool = g_malloc (initial_size);
pool->next = NULL;
- pool->pos = (char *)pool + sizeof (MonoMemPool);
- pool->rest = MONO_MEMPOOL_PAGESIZE - sizeof (MonoMemPool);
+ pool->pos = (guint8*)pool + sizeof (MonoMemPool);
+ pool->end = pool->pos + initial_size - sizeof (MonoMemPool);
+ pool->d.allocated = pool->size = initial_size;
return pool;
}
/**
* mono_mempool_destroy:
- * @pool: the momory pool to destroy
+ * @pool: the memory pool to destroy
*
* Free all memory associated with this pool.
*/
}
}
+/**
+ * mono_mempool_invalidate:
+ * @pool: the memory pool to invalidate
+ *
+ * Fill the memory associated with this pool to 0x2a (42). Useful for debugging.
+ */
+void
+mono_mempool_invalidate (MonoMemPool *pool)
+{
+ MonoMemPool *p, *n;
+
+ p = pool;
+ while (p) {
+ n = p->next;
+ memset (p, 42, p->size);
+ p = n;
+ }
+}
+
+void
+mono_mempool_empty (MonoMemPool *pool)
+{
+ pool->pos = (guint8*)pool + sizeof (MonoMemPool);
+ pool->end = pool->pos + pool->size - sizeof (MonoMemPool);
+}
+
+/**
+ * mono_mempool_stats:
+ * @pool: the momory pool we need stats for
+ *
+ * Print a few stats about the mempool
+ */
+void
+mono_mempool_stats (MonoMemPool *pool)
+{
+ MonoMemPool *p;
+ int count = 0;
+ guint32 still_free = 0;
+
+ p = pool;
+ while (p) {
+ still_free += p->end - p->pos;
+ p = p->next;
+ count++;
+ }
+ if (pool) {
+ g_print ("Mempool %p stats:\n", pool);
+ g_print ("Total mem allocated: %d\n", pool->d.allocated);
+ g_print ("Num chunks: %d\n", count);
+ g_print ("Free memory: %d\n", still_free);
+ }
+}
+
+#ifdef TRACE_ALLOCATIONS
+#include <execinfo.h>
+#include "metadata/appdomain.h"
+#include "metadata/metadata-internals.h"
+
+static void
+mono_backtrace (int limit)
+{
+ void *array[limit];
+ char **names;
+ int i;
+ backtrace (array, limit);
+ names = backtrace_symbols (array, limit);
+ for (i = 1; i < limit; ++i) {
+ g_print ("\t%s\n", names [i]);
+ }
+ g_free (names);
+}
+
+#endif
+
+static int
+get_next_size (MonoMemPool *pool, int size)
+{
+ int target = pool->next? pool->next->size: pool->size;
+ size += sizeof (MonoMemPool);
+ /* increase the size */
+ target += target / 2;
+ while (target < size) {
+ target += target / 2;
+ }
+ if (target > MONO_MEMPOOL_PAGESIZE)
+ target = MONO_MEMPOOL_PAGESIZE;
+ /* we are called with size smaller than 4096 */
+ g_assert (size <= MONO_MEMPOOL_PAGESIZE);
+ return target;
+}
+
/**
* mono_mempool_alloc:
* @pool: the momory pool to destroy
* @size: size of the momory block
*
- * Allocates a new block of memory in @pool. @size must
- * be smaller than 256.
+ * Allocates a new block of memory in @pool.
*
* Returns: the address of a newly allocated memory block.
*/
{
gpointer rval;
- g_assert (pool != NULL);
-
size = (size + MEM_ALIGN - 1) & ~(MEM_ALIGN - 1);
- if (pool->rest < size) {
+ rval = pool->pos;
+ pool->pos = (guint8*)rval + size;
+
+#ifdef TRACE_ALLOCATIONS
+ if (pool == mono_get_corlib ()->mempool) {
+ g_print ("Allocating %d bytes\n", size);
+ mono_backtrace (7);
+ }
+#endif
+ if (G_UNLIKELY (pool->pos >= pool->end)) {
+ pool->pos -= size;
if (size >= 4096) {
MonoMemPool *np = g_malloc (sizeof (MonoMemPool) + size);
np->next = pool->next;
pool->next = np;
- return (char *)np + sizeof (MonoMemPool);
+ np->pos = (guint8*)np + sizeof (MonoMemPool);
+ np->size = sizeof (MonoMemPool) + size;
+ np->end = np->pos + np->size - sizeof (MonoMemPool);
+ pool->d.allocated += sizeof (MonoMemPool) + size;
+ return (guint8*)np + sizeof (MonoMemPool);
} else {
- MonoMemPool *np = g_malloc (MONO_MEMPOOL_PAGESIZE);
+ int new_size = get_next_size (pool, size);
+ MonoMemPool *np = g_malloc (new_size);
np->next = pool->next;
pool->next = np;
- pool->pos = (char *)np + sizeof (MonoMemPool);
- pool->rest = MONO_MEMPOOL_PAGESIZE - sizeof (MonoMemPool);
+ pool->pos = (guint8*)np + sizeof (MonoMemPool);
+ np->pos = (guint8*)np + sizeof (MonoMemPool);
+ np->size = new_size;
+ np->end = np->pos;
+ pool->end = pool->pos + new_size - sizeof (MonoMemPool);
+ pool->d.allocated += new_size;
+
+ rval = pool->pos;
+ pool->pos += size;
}
}
- rval = pool->pos;
- pool->rest -= size;
- pool->pos = (char *)pool->pos + size;
-
return rval;
}
gpointer
mono_mempool_alloc0 (MonoMemPool *pool, guint size)
{
- gpointer rval = mono_mempool_alloc (pool, size);
+ gpointer rval;
+
+ size = (size + MEM_ALIGN - 1) & ~(MEM_ALIGN - 1);
+
+ rval = pool->pos;
+ pool->pos = (guint8*)rval + size;
+
+ if (G_UNLIKELY (pool->pos >= pool->end)) {
+ rval = mono_mempool_alloc (pool, size);
+ }
+
memset (rval, 0, size);
return rval;
}
+/**
+ * mono_mempool_contains_addr:
+ *
+ * Determines whenever ADDR is inside the memory used by the mempool.
+ */
+gboolean
+mono_mempool_contains_addr (MonoMemPool *pool,
+ gpointer addr)
+{
+ MonoMemPool *p;
+
+ p = pool;
+ while (p) {
+ if (addr > (gpointer)p && addr <= (gpointer)((guint8*)p + p->size))
+ return TRUE;
+ p = p->next;
+ }
+
+ return FALSE;
+}
+
+/**
+ * mono_mempool_strdup:
+ *
+ * Same as strdup, but allocates memory from the mempool.
+ * Returns: a pointer to the newly allocated string data inside the mempool.
+ */
+char*
+mono_mempool_strdup (MonoMemPool *pool,
+ const char *s)
+{
+ int l;
+ char *res;
+
+ if (s == NULL)
+ return NULL;
+
+ l = strlen (s);
+ res = mono_mempool_alloc (pool, l + 1);
+ memcpy (res, s, l + 1);
+
+ return res;
+}
+
+/**
+ * mono_mempool_get_allocated:
+ *
+ * Return the amount of memory allocated for this mempool.
+ */
+guint32
+mono_mempool_get_allocated (MonoMemPool *pool)
+{
+ return pool->d.allocated;
+}
projects / mono.git / blobdiff