* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
+ * modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
- * Library General Public License for more details.
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
- * Modified by the GLib Team and others 1997-1999. See the AUTHORS
+ * Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
* MT safe
*/
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
+#include "config.h"
+
+#include "gmem.h"
#include <stdlib.h>
#include <string.h>
-#include "glib.h"
-
-/* #define ENABLE_MEM_PROFILE */
-/* #define ENABLE_MEM_PROFILE_EXCLUDES_MEM_CHUNKS */
-/* #define ENABLE_MEM_CHECK */
-#define MEM_PROFILE_TABLE_SIZE 8192
+#include <signal.h>
-/*
- * This library can check for some attempts to do illegal things to
- * memory (ENABLE_MEM_CHECK), and can do profiling
- * (ENABLE_MEM_PROFILE). Both features are implemented by storing
- * words before the start of the memory chunk.
- *
- * The first, at offset -2*SIZEOF_LONG, is used only if
- * ENABLE_MEM_CHECK is set, and stores 0 after the memory has been
- * allocated and 1 when it has been freed. The second, at offset
- * -SIZEOF_LONG, is used if either flag is set and stores the size of
- * the block.
- *
- * The MEM_CHECK flag is checked when memory is realloc'd and free'd,
- * and it can be explicitly checked before using a block by calling
- * g_mem_check().
- */
+#include "gslice.h"
+#include "gbacktrace.h"
+#include "gtestutils.h"
+#include "gthread.h"
+#include "glib_trace.h"
-#if defined(ENABLE_MEM_PROFILE) && defined(ENABLE_MEM_PROFILE_EXCLUDES_MEM_CHUNKS)
-#define ENTER_MEM_CHUNK_ROUTINE() \
- g_static_set (allocating_for_mem_chunk, \
- g_static_get (allocating_for_mem_chunk) + 1)
-#define LEAVE_MEM_CHUNK_ROUTINE() \
- g_static_set (allocating_for_mem_chunk, \
- g_static_get (allocating_for_mem_chunk) - 1)
-#else
-#define ENTER_MEM_CHUNK_ROUTINE()
-#define LEAVE_MEM_CHUNK_ROUTINE()
-#endif
+#define MEM_PROFILE_TABLE_SIZE 4096
-#define MAX_MEM_AREA 65536L
-#define MEM_AREA_SIZE 4L
-
-#if SIZEOF_VOID_P > SIZEOF_LONG
-#define MEM_ALIGN SIZEOF_VOID_P
-#else
-#define MEM_ALIGN SIZEOF_LONG
-#endif
-
-
-typedef struct _GFreeAtom GFreeAtom;
-typedef struct _GMemArea GMemArea;
-typedef struct _GRealMemChunk GRealMemChunk;
+/* notes on macros:
+ * having G_DISABLE_CHECKS defined disables use of glib_mem_profiler_table and
+ * g_mem_profile().
+ * If g_mem_gc_friendly is TRUE, freed memory should be 0-wiped.
+ */
-struct _GFreeAtom
-{
- GFreeAtom *next;
+/* --- variables --- */
+static GMemVTable glib_mem_vtable = {
+ malloc,
+ realloc,
+ free,
+ calloc,
+ malloc,
+ realloc,
};
-struct _GMemArea
-{
- GMemArea *next; /* the next mem area */
- GMemArea *prev; /* the previous mem area */
- gulong index; /* the current index into the "mem" array */
- gulong free; /* the number of free bytes in this mem area */
- gulong allocated; /* the number of atoms allocated from this area */
- gulong mark; /* is this mem area marked for deletion */
- gchar mem[MEM_AREA_SIZE]; /* the mem array from which atoms get allocated
- * the actual size of this array is determined by
- * the mem chunk "area_size". ANSI says that it
- * must be declared to be the maximum size it
- * can possibly be (even though the actual size
- * may be less).
- */
-};
+/**
+ * SECTION:memory
+ * @Short_Description: general memory-handling
+ * @Title: Memory Allocation
+ *
+ * These functions provide support for allocating and freeing memory.
+ *
+ * If any call to allocate memory fails, the application is terminated.
+ * This also means that there is no need to check if the call succeeded.
+ *
+ * It's important to match g_malloc() (and wrappers such as g_new()) with
+ * g_free(), g_slice_alloc() (and wrappers such as g_slice_new()) with
+ * g_slice_free(), plain malloc() with free(), and (if you're using C++)
+ * new with delete and new[] with delete[]. Otherwise bad things can happen,
+ * since these allocators may use different memory pools (and new/delete call
+ * constructors and destructors). See also g_mem_set_vtable().
+ */
-struct _GRealMemChunk
+/* --- functions --- */
+/**
+ * g_malloc:
+ * @n_bytes: the number of bytes to allocate
+ *
+ * Allocates @n_bytes bytes of memory.
+ * If @n_bytes is 0 it returns %NULL.
+ *
+ * Returns: a pointer to the allocated memory
+ */
+gpointer
+g_malloc (gsize n_bytes)
{
- gchar *name; /* name of this MemChunk...used for debugging output */
- gint type; /* the type of MemChunk: ALLOC_ONLY or ALLOC_AND_FREE */
- gint num_mem_areas; /* the number of memory areas */
- gint num_marked_areas; /* the number of areas marked for deletion */
- guint atom_size; /* the size of an atom */
- gulong area_size; /* the size of a memory area */
- GMemArea *mem_area; /* the current memory area */
- GMemArea *mem_areas; /* a list of all the mem areas owned by this chunk */
- GMemArea *free_mem_area; /* the free area...which is about to be destroyed */
- GFreeAtom *free_atoms; /* the free atoms list */
- GTree *mem_tree; /* tree of mem areas sorted by memory address */
- GRealMemChunk *next; /* pointer to the next chunk */
- GRealMemChunk *prev; /* pointer to the previous chunk */
-};
+ if (G_LIKELY (n_bytes))
+ {
+ gpointer mem;
+ mem = glib_mem_vtable.malloc (n_bytes);
+ TRACE (GLIB_MEM_ALLOC((void*) mem, (unsigned int) n_bytes, 0, 0));
+ if (mem)
+ return mem;
-static gulong g_mem_chunk_compute_size (gulong size);
-static gint g_mem_chunk_area_compare (GMemArea *a,
- GMemArea *b);
-static gint g_mem_chunk_area_search (GMemArea *a,
- gchar *addr);
+ g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",
+ G_STRLOC, n_bytes);
+ }
+ TRACE(GLIB_MEM_ALLOC((void*) NULL, (int) n_bytes, 0, 0));
-/* here we can't use StaticMutexes, as they depend upon a working
- * g_malloc, the same holds true for StaticPrivate */
-static GMutex* mem_chunks_lock = NULL;
-static GRealMemChunk *mem_chunks = NULL;
+ return NULL;
+}
-#ifdef ENABLE_MEM_PROFILE
-static GMutex* mem_profile_lock;
-static gulong allocations[MEM_PROFILE_TABLE_SIZE] = { 0 };
-static gulong allocated_mem = 0;
-static gulong freed_mem = 0;
-static GPrivate* allocating_for_mem_chunk = NULL;
-#define IS_IN_MEM_CHUNK_ROUTINE() \
- GPOINTER_TO_UINT (g_static_get (allocating_for_mem_chunk))
-#endif /* ENABLE_MEM_PROFILE */
+/**
+ * g_malloc0:
+ * @n_bytes: the number of bytes to allocate
+ *
+ * Allocates @n_bytes bytes of memory, initialized to 0's.
+ * If @n_bytes is 0 it returns %NULL.
+ *
+ * Returns: a pointer to the allocated memory
+ */
+gpointer
+g_malloc0 (gsize n_bytes)
+{
+ if (G_LIKELY (n_bytes))
+ {
+ gpointer mem;
+ mem = glib_mem_vtable.calloc (1, n_bytes);
+ TRACE (GLIB_MEM_ALLOC((void*) mem, (unsigned int) n_bytes, 1, 0));
+ if (mem)
+ return mem;
-#ifndef USE_DMALLOC
+ g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",
+ G_STRLOC, n_bytes);
+ }
-gpointer
-g_malloc (gulong size)
-{
- gpointer p;
-
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- gulong *t;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-
- if (size == 0)
- return NULL;
-
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- size += SIZEOF_LONG;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-#ifdef ENABLE_MEM_CHECK
- size += SIZEOF_LONG;
-#endif /* ENABLE_MEM_CHECK */
-
-
- p = (gpointer) malloc (size);
- if (!p)
- g_error ("could not allocate %ld bytes", size);
-
-
-#ifdef ENABLE_MEM_CHECK
- size -= SIZEOF_LONG;
-
- t = p;
- p = ((guchar*) p + SIZEOF_LONG);
- *t = 0;
-#endif /* ENABLE_MEM_CHECK */
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- size -= SIZEOF_LONG;
-
- t = p;
- p = ((guchar*) p + SIZEOF_LONG);
- *t = size;
-
-#ifdef ENABLE_MEM_PROFILE
- g_mutex_lock (mem_profile_lock);
-# ifdef ENABLE_MEM_PROFILE_EXCLUDES_MEM_CHUNKS
- if(!IS_IN_MEM_CHUNK_ROUTINE()) {
-# endif
- if (size <= MEM_PROFILE_TABLE_SIZE - 1)
- allocations[size-1] += 1;
- else
- allocations[MEM_PROFILE_TABLE_SIZE - 1] += 1;
- allocated_mem += size;
-# ifdef ENABLE_MEM_PROFILE_EXCLUDES_MEM_CHUNKS
- }
-# endif
- g_mutex_unlock (mem_profile_lock);
-#endif /* ENABLE_MEM_PROFILE */
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-
- return p;
-}
+ TRACE(GLIB_MEM_ALLOC((void*) NULL, (int) n_bytes, 1, 0));
-gpointer
-g_malloc0 (gulong size)
-{
- gpointer p;
-
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- gulong *t;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-
- if (size == 0)
- return NULL;
-
-
-#if defined (ENABLE_MEM_PROFILE) || defined (ENABLE_MEM_CHECK)
- size += SIZEOF_LONG;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-#ifdef ENABLE_MEM_CHECK
- size += SIZEOF_LONG;
-#endif /* ENABLE_MEM_CHECK */
-
-
- p = (gpointer) calloc (size, 1);
- if (!p)
- g_error ("could not allocate %ld bytes", size);
-
-
-#ifdef ENABLE_MEM_CHECK
- size -= SIZEOF_LONG;
-
- t = p;
- p = ((guchar*) p + SIZEOF_LONG);
- *t = 0;
-#endif /* ENABLE_MEM_CHECK */
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- size -= SIZEOF_LONG;
-
- t = p;
- p = ((guchar*) p + SIZEOF_LONG);
- *t = size;
-
-# ifdef ENABLE_MEM_PROFILE
- g_mutex_lock (mem_profile_lock);
-# ifdef ENABLE_MEM_PROFILE_EXCLUDES_MEM_CHUNKS
- if(!IS_IN_MEM_CHUNK_ROUTINE()) {
-# endif
- if (size <= (MEM_PROFILE_TABLE_SIZE - 1))
- allocations[size-1] += 1;
- else
- allocations[MEM_PROFILE_TABLE_SIZE - 1] += 1;
- allocated_mem += size;
-# ifdef ENABLE_MEM_PROFILE_EXCLUDES_MEM_CHUNKS
- }
-# endif
- g_mutex_unlock (mem_profile_lock);
-# endif /* ENABLE_MEM_PROFILE */
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-
- return p;
+ return NULL;
}
+/**
+ * g_realloc:
+ * @mem: (allow-none): the memory to reallocate
+ * @n_bytes: new size of the memory in bytes
+ *
+ * Reallocates the memory pointed to by @mem, so that it now has space for
+ * @n_bytes bytes of memory. It returns the new address of the memory, which may
+ * have been moved. @mem may be %NULL, in which case it's considered to
+ * have zero-length. @n_bytes may be 0, in which case %NULL will be returned
+ * and @mem will be freed unless it is %NULL.
+ *
+ * Returns: the new address of the allocated memory
+ */
gpointer
g_realloc (gpointer mem,
- gulong size)
+ gsize n_bytes)
{
- gpointer p;
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- gulong *t;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-
- if (size == 0)
- {
- g_free (mem);
-
- return NULL;
- }
-
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- size += SIZEOF_LONG;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-#ifdef ENABLE_MEM_CHECK
- size += SIZEOF_LONG;
-#endif /* ENABLE_MEM_CHECK */
-
-
- if (!mem)
- {
-#ifdef REALLOC_0_WORKS
- p = (gpointer) realloc (NULL, size);
-#else /* !REALLOC_0_WORKS */
- p = (gpointer) malloc (size);
-#endif /* !REALLOC_0_WORKS */
- }
- else
+ gpointer newmem;
+
+ if (G_LIKELY (n_bytes))
{
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- t = (gulong*) ((guchar*) mem - SIZEOF_LONG);
-#ifdef ENABLE_MEM_PROFILE
- g_mutex_lock (mem_profile_lock);
- freed_mem += *t;
- g_mutex_unlock (mem_profile_lock);
-#endif /* ENABLE_MEM_PROFILE */
- mem = t;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-#ifdef ENABLE_MEM_CHECK
- t = (gulong*) ((guchar*) mem - SIZEOF_LONG);
- if (*t >= 1)
- g_warning ("trying to realloc freed memory\n");
- mem = t;
-#endif /* ENABLE_MEM_CHECK */
-
- p = (gpointer) realloc (mem, size);
+ newmem = glib_mem_vtable.realloc (mem, n_bytes);
+ TRACE (GLIB_MEM_REALLOC((void*) newmem, (void*)mem, (unsigned int) n_bytes, 0));
+ if (newmem)
+ return newmem;
+
+ g_error ("%s: failed to allocate %"G_GSIZE_FORMAT" bytes",
+ G_STRLOC, n_bytes);
}
-
- if (!p)
- g_error ("could not reallocate %lu bytes", (gulong) size);
-
-
-#ifdef ENABLE_MEM_CHECK
- size -= SIZEOF_LONG;
-
- t = p;
- p = ((guchar*) p + SIZEOF_LONG);
- *t = 0;
-#endif /* ENABLE_MEM_CHECK */
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- size -= SIZEOF_LONG;
-
- t = p;
- p = ((guchar*) p + SIZEOF_LONG);
- *t = size;
-
-#ifdef ENABLE_MEM_PROFILE
- g_mutex_lock (mem_profile_lock);
-#ifdef ENABLE_MEM_PROFILE_EXCLUDES_MEM_CHUNKS
- if(!IS_IN_MEM_CHUNK_ROUTINE()) {
-#endif
- if (size <= (MEM_PROFILE_TABLE_SIZE - 1))
- allocations[size-1] += 1;
- else
- allocations[MEM_PROFILE_TABLE_SIZE - 1] += 1;
- allocated_mem += size;
-#ifdef ENABLE_MEM_PROFILE_EXCLUDES_MEM_CHUNKS
- }
-#endif
- g_mutex_unlock (mem_profile_lock);
-#endif /* ENABLE_MEM_PROFILE */
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-
- return p;
+
+ if (mem)
+ glib_mem_vtable.free (mem);
+
+ TRACE (GLIB_MEM_REALLOC((void*) NULL, (void*)mem, 0, 0));
+
+ return NULL;
}
+/**
+ * g_free:
+ * @mem: (allow-none): the memory to free
+ *
+ * Frees the memory pointed to by @mem.
+ * If @mem is %NULL it simply returns.
+ */
void
g_free (gpointer mem)
{
- if (mem)
+ if (G_LIKELY (mem))
+ glib_mem_vtable.free (mem);
+ TRACE(GLIB_MEM_FREE((void*) mem));
+}
+
+/**
+ * g_clear_pointer: (skip)
+ * @pp: a pointer to a variable, struct member etc. holding a pointer
+ * @destroy: a function to which a gpointer can be passed, to destroy *@pp
+ *
+ * Clears a reference to a variable.
+ *
+ * @pp must not be %NULL.
+ *
+ * If the reference is %NULL then this function does nothing.
+ * Otherwise, the variable is destroyed using @destroy and the
+ * pointer is set to %NULL.
+ *
+ * A macro is also included that allows this function to be used without
+ * pointer casts.
+ *
+ * Since: 2.34
+ **/
+#undef g_clear_pointer
+void
+g_clear_pointer (gpointer *pp,
+ GDestroyNotify destroy)
+{
+ gpointer _p;
+
+ _p = *pp;
+ if (_p)
{
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- gulong *t;
- gulong size;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-#if defined(ENABLE_MEM_PROFILE) || defined(ENABLE_MEM_CHECK)
- t = (gulong*) ((guchar*) mem - SIZEOF_LONG);
- size = *t;
-#ifdef ENABLE_MEM_PROFILE
- g_mutex_lock (mem_profile_lock);
- freed_mem += size;
- g_mutex_unlock (mem_profile_lock);
-#endif /* ENABLE_MEM_PROFILE */
- mem = t;
-#endif /* ENABLE_MEM_PROFILE || ENABLE_MEM_CHECK */
-
-#ifdef ENABLE_MEM_CHECK
- t = (gulong*) ((guchar*) mem - SIZEOF_LONG);
- if (*t >= 1)
- g_warning ("freeing previously freed memory\n");
- *t += 1;
- mem = t;
-
- memset ((guchar*) mem + 8, 0, size);
-#else /* ENABLE_MEM_CHECK */
- free (mem);
-#endif /* ENABLE_MEM_CHECK */
+ *pp = NULL;
+ destroy (_p);
}
}
-#endif /* ! USE_DMALLOC */
+/**
+ * g_try_malloc:
+ * @n_bytes: number of bytes to allocate.
+ *
+ * Attempts to allocate @n_bytes, and returns %NULL on failure.
+ * Contrast with g_malloc(), which aborts the program on failure.
+ *
+ * Returns: the allocated memory, or %NULL.
+ */
+gpointer
+g_try_malloc (gsize n_bytes)
+{
+ gpointer mem;
+ if (G_LIKELY (n_bytes))
+ mem = glib_mem_vtable.try_malloc (n_bytes);
+ else
+ mem = NULL;
-void
-g_mem_profile (void)
-{
-#ifdef ENABLE_MEM_PROFILE
- gint i;
- gulong local_allocations[MEM_PROFILE_TABLE_SIZE];
- gulong local_allocated_mem;
- gulong local_freed_mem;
-
- g_mutex_lock (mem_profile_lock);
- for (i = 0; i < MEM_PROFILE_TABLE_SIZE; i++)
- local_allocations[i] = allocations[i];
- local_allocated_mem = allocated_mem;
- local_freed_mem = freed_mem;
- g_mutex_unlock (mem_profile_lock);
-
- for (i = 0; i < (MEM_PROFILE_TABLE_SIZE - 1); i++)
- if (local_allocations[i] > 0)
- g_log (g_log_domain_glib, G_LOG_LEVEL_INFO,
- "%lu allocations of %d bytes", local_allocations[i], i + 1);
-
- if (local_allocations[MEM_PROFILE_TABLE_SIZE - 1] > 0)
- g_log (g_log_domain_glib, G_LOG_LEVEL_INFO,
- "%lu allocations of greater than %d bytes",
- local_allocations[MEM_PROFILE_TABLE_SIZE - 1], MEM_PROFILE_TABLE_SIZE - 1);
- g_log (g_log_domain_glib, G_LOG_LEVEL_INFO, "%lu bytes allocated", local_allocated_mem);
- g_log (g_log_domain_glib, G_LOG_LEVEL_INFO, "%lu bytes freed", local_freed_mem);
- g_log (g_log_domain_glib, G_LOG_LEVEL_INFO, "%lu bytes in use", local_allocated_mem - local_freed_mem);
-#endif /* ENABLE_MEM_PROFILE */
+ TRACE (GLIB_MEM_ALLOC((void*) mem, (unsigned int) n_bytes, 0, 1));
+
+ return mem;
}
-void
-g_mem_check (gpointer mem)
+/**
+ * g_try_malloc0:
+ * @n_bytes: number of bytes to allocate
+ *
+ * Attempts to allocate @n_bytes, initialized to 0's, and returns %NULL on
+ * failure. Contrast with g_malloc0(), which aborts the program on failure.
+ *
+ * Since: 2.8
+ * Returns: the allocated memory, or %NULL
+ */
+gpointer
+g_try_malloc0 (gsize n_bytes)
{
-#ifdef ENABLE_MEM_CHECK
- gulong *t;
-
- t = (gulong*) ((guchar*) mem - SIZEOF_LONG - SIZEOF_LONG);
-
- if (*t >= 1)
- g_warning ("mem: 0x%08x has been freed %lu times\n", (gulong) mem, *t);
-#endif /* ENABLE_MEM_CHECK */
+ gpointer mem;
+
+ if (G_LIKELY (n_bytes))
+ mem = glib_mem_vtable.try_malloc (n_bytes);
+ else
+ mem = NULL;
+
+ if (mem)
+ memset (mem, 0, n_bytes);
+
+ return mem;
}
-GMemChunk*
-g_mem_chunk_new (gchar *name,
- gint atom_size,
- gulong area_size,
- gint type)
+/**
+ * g_try_realloc:
+ * @mem: (allow-none): previously-allocated memory, or %NULL.
+ * @n_bytes: number of bytes to allocate.
+ *
+ * Attempts to realloc @mem to a new size, @n_bytes, and returns %NULL
+ * on failure. Contrast with g_realloc(), which aborts the program
+ * on failure. If @mem is %NULL, behaves the same as g_try_malloc().
+ *
+ * Returns: the allocated memory, or %NULL.
+ */
+gpointer
+g_try_realloc (gpointer mem,
+ gsize n_bytes)
{
- GRealMemChunk *mem_chunk;
- gulong rarea_size;
-
- ENTER_MEM_CHUNK_ROUTINE();
-
- mem_chunk = g_new (struct _GRealMemChunk, 1);
- mem_chunk->name = name;
- mem_chunk->type = type;
- mem_chunk->num_mem_areas = 0;
- mem_chunk->num_marked_areas = 0;
- mem_chunk->mem_area = NULL;
- mem_chunk->free_mem_area = NULL;
- mem_chunk->free_atoms = NULL;
- mem_chunk->mem_tree = NULL;
- mem_chunk->mem_areas = NULL;
- mem_chunk->atom_size = atom_size;
-
- if (mem_chunk->type == G_ALLOC_AND_FREE)
- mem_chunk->mem_tree = g_tree_new ((GCompareFunc) g_mem_chunk_area_compare);
-
- if (mem_chunk->atom_size % MEM_ALIGN)
- mem_chunk->atom_size += MEM_ALIGN - (mem_chunk->atom_size % MEM_ALIGN);
-
- mem_chunk->area_size = area_size;
- if (mem_chunk->area_size > MAX_MEM_AREA)
- mem_chunk->area_size = MAX_MEM_AREA;
- while (mem_chunk->area_size < mem_chunk->atom_size)
- mem_chunk->area_size *= 2;
-
- rarea_size = mem_chunk->area_size + sizeof (GMemArea) - MEM_AREA_SIZE;
- rarea_size = g_mem_chunk_compute_size (rarea_size);
- mem_chunk->area_size = rarea_size - (sizeof (GMemArea) - MEM_AREA_SIZE);
-
- /*
- mem_chunk->area_size -= (sizeof (GMemArea) - MEM_AREA_SIZE);
- if (mem_chunk->area_size < mem_chunk->atom_size)
+ gpointer newmem;
+
+ if (G_LIKELY (n_bytes))
+ newmem = glib_mem_vtable.try_realloc (mem, n_bytes);
+ else
{
- mem_chunk->area_size = (mem_chunk->area_size + sizeof (GMemArea) - MEM_AREA_SIZE) * 2;
- mem_chunk->area_size -= (sizeof (GMemArea) - MEM_AREA_SIZE);
+ newmem = NULL;
+ if (mem)
+ glib_mem_vtable.free (mem);
}
-
- if (mem_chunk->area_size % mem_chunk->atom_size)
- mem_chunk->area_size += mem_chunk->atom_size - (mem_chunk->area_size % mem_chunk->atom_size);
- */
-
- g_mutex_lock (mem_chunks_lock);
- mem_chunk->next = mem_chunks;
- mem_chunk->prev = NULL;
- if (mem_chunks)
- mem_chunks->prev = mem_chunk;
- mem_chunks = mem_chunk;
- g_mutex_unlock (mem_chunks_lock);
- LEAVE_MEM_CHUNK_ROUTINE();
+ TRACE (GLIB_MEM_REALLOC((void*) newmem, (void*)mem, (unsigned int) n_bytes, 1));
- return ((GMemChunk*) mem_chunk);
+ return newmem;
}
-void
-g_mem_chunk_destroy (GMemChunk *mem_chunk)
-{
- GRealMemChunk *rmem_chunk;
- GMemArea *mem_areas;
- GMemArea *temp_area;
-
- g_return_if_fail (mem_chunk != NULL);
- ENTER_MEM_CHUNK_ROUTINE();
+#define SIZE_OVERFLOWS(a,b) (G_UNLIKELY ((b) > 0 && (a) > G_MAXSIZE / (b)))
- rmem_chunk = (GRealMemChunk*) mem_chunk;
-
- mem_areas = rmem_chunk->mem_areas;
- while (mem_areas)
+/**
+ * g_malloc_n:
+ * @n_blocks: the number of blocks to allocate
+ * @n_block_bytes: the size of each block in bytes
+ *
+ * This function is similar to g_malloc(), allocating (@n_blocks * @n_block_bytes) bytes,
+ * but care is taken to detect possible overflow during multiplication.
+ *
+ * Since: 2.24
+ * Returns: a pointer to the allocated memory
+ */
+gpointer
+g_malloc_n (gsize n_blocks,
+ gsize n_block_bytes)
+{
+ if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))
{
- temp_area = mem_areas;
- mem_areas = mem_areas->next;
- g_free (temp_area);
+ g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",
+ G_STRLOC, n_blocks, n_block_bytes);
}
-
- if (rmem_chunk->next)
- rmem_chunk->next->prev = rmem_chunk->prev;
- if (rmem_chunk->prev)
- rmem_chunk->prev->next = rmem_chunk->next;
-
- g_mutex_lock (mem_chunks_lock);
- if (rmem_chunk == mem_chunks)
- mem_chunks = mem_chunks->next;
- g_mutex_unlock (mem_chunks_lock);
-
- if (rmem_chunk->type == G_ALLOC_AND_FREE)
- g_tree_destroy (rmem_chunk->mem_tree);
-
- g_free (rmem_chunk);
- LEAVE_MEM_CHUNK_ROUTINE();
+ return g_malloc (n_blocks * n_block_bytes);
}
+/**
+ * g_malloc0_n:
+ * @n_blocks: the number of blocks to allocate
+ * @n_block_bytes: the size of each block in bytes
+ *
+ * This function is similar to g_malloc0(), allocating (@n_blocks * @n_block_bytes) bytes,
+ * but care is taken to detect possible overflow during multiplication.
+ *
+ * Since: 2.24
+ * Returns: a pointer to the allocated memory
+ */
gpointer
-g_mem_chunk_alloc (GMemChunk *mem_chunk)
+g_malloc0_n (gsize n_blocks,
+ gsize n_block_bytes)
{
- GRealMemChunk *rmem_chunk;
- GMemArea *temp_area;
- gpointer mem;
-
- ENTER_MEM_CHUNK_ROUTINE();
-
- g_return_val_if_fail (mem_chunk != NULL, NULL);
-
- rmem_chunk = (GRealMemChunk*) mem_chunk;
-
- while (rmem_chunk->free_atoms)
+ if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))
{
- /* Get the first piece of memory on the "free_atoms" list.
- * We can go ahead and destroy the list node we used to keep
- * track of it with and to update the "free_atoms" list to
- * point to its next element.
- */
- mem = rmem_chunk->free_atoms;
- rmem_chunk->free_atoms = rmem_chunk->free_atoms->next;
-
- /* Determine which area this piece of memory is allocated from */
- temp_area = g_tree_search (rmem_chunk->mem_tree,
- (GSearchFunc) g_mem_chunk_area_search,
- mem);
-
- /* If the area has been marked, then it is being destroyed.
- * (ie marked to be destroyed).
- * We check to see if all of the segments on the free list that
- * reference this area have been removed. This occurs when
- * the ammount of free memory is less than the allocatable size.
- * If the chunk should be freed, then we place it in the "free_mem_area".
- * This is so we make sure not to free the mem area here and then
- * allocate it again a few lines down.
- * If we don't allocate a chunk a few lines down then the "free_mem_area"
- * will be freed.
- * If there is already a "free_mem_area" then we'll just free this mem area.
- */
- if (temp_area->mark)
- {
- /* Update the "free" memory available in that area */
- temp_area->free += rmem_chunk->atom_size;
-
- if (temp_area->free == rmem_chunk->area_size)
- {
- if (temp_area == rmem_chunk->mem_area)
- rmem_chunk->mem_area = NULL;
-
- if (rmem_chunk->free_mem_area)
- {
- rmem_chunk->num_mem_areas -= 1;
-
- if (temp_area->next)
- temp_area->next->prev = temp_area->prev;
- if (temp_area->prev)
- temp_area->prev->next = temp_area->next;
- if (temp_area == rmem_chunk->mem_areas)
- rmem_chunk->mem_areas = rmem_chunk->mem_areas->next;
-
- if (rmem_chunk->type == G_ALLOC_AND_FREE)
- g_tree_remove (rmem_chunk->mem_tree, temp_area);
- g_free (temp_area);
- }
- else
- rmem_chunk->free_mem_area = temp_area;
-
- rmem_chunk->num_marked_areas -= 1;
- }
- }
- else
- {
- /* Update the number of allocated atoms count.
- */
- temp_area->allocated += 1;
-
- /* The area wasn't marked...return the memory
- */
- goto outa_here;
- }
+ g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",
+ G_STRLOC, n_blocks, n_block_bytes);
}
-
- /* If there isn't a current mem area or the current mem area is out of space
- * then allocate a new mem area. We'll first check and see if we can use
- * the "free_mem_area". Otherwise we'll just malloc the mem area.
- */
- if ((!rmem_chunk->mem_area) ||
- ((rmem_chunk->mem_area->index + rmem_chunk->atom_size) > rmem_chunk->area_size))
+
+ return g_malloc0 (n_blocks * n_block_bytes);
+}
+
+/**
+ * g_realloc_n:
+ * @mem: (allow-none): the memory to reallocate
+ * @n_blocks: the number of blocks to allocate
+ * @n_block_bytes: the size of each block in bytes
+ *
+ * This function is similar to g_realloc(), allocating (@n_blocks * @n_block_bytes) bytes,
+ * but care is taken to detect possible overflow during multiplication.
+ *
+ * Since: 2.24
+ * Returns: the new address of the allocated memory
+ */
+gpointer
+g_realloc_n (gpointer mem,
+ gsize n_blocks,
+ gsize n_block_bytes)
+{
+ if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))
{
- if (rmem_chunk->free_mem_area)
- {
- rmem_chunk->mem_area = rmem_chunk->free_mem_area;
- rmem_chunk->free_mem_area = NULL;
- }
- else
- {
- rmem_chunk->mem_area = (GMemArea*) g_malloc (sizeof (GMemArea) -
- MEM_AREA_SIZE +
- rmem_chunk->area_size);
-
- rmem_chunk->num_mem_areas += 1;
- rmem_chunk->mem_area->next = rmem_chunk->mem_areas;
- rmem_chunk->mem_area->prev = NULL;
-
- if (rmem_chunk->mem_areas)
- rmem_chunk->mem_areas->prev = rmem_chunk->mem_area;
- rmem_chunk->mem_areas = rmem_chunk->mem_area;
-
- if (rmem_chunk->type == G_ALLOC_AND_FREE)
- g_tree_insert (rmem_chunk->mem_tree, rmem_chunk->mem_area, rmem_chunk->mem_area);
- }
-
- rmem_chunk->mem_area->index = 0;
- rmem_chunk->mem_area->free = rmem_chunk->area_size;
- rmem_chunk->mem_area->allocated = 0;
- rmem_chunk->mem_area->mark = 0;
+ g_error ("%s: overflow allocating %"G_GSIZE_FORMAT"*%"G_GSIZE_FORMAT" bytes",
+ G_STRLOC, n_blocks, n_block_bytes);
}
-
- /* Get the memory and modify the state variables appropriately.
- */
- mem = (gpointer) &rmem_chunk->mem_area->mem[rmem_chunk->mem_area->index];
- rmem_chunk->mem_area->index += rmem_chunk->atom_size;
- rmem_chunk->mem_area->free -= rmem_chunk->atom_size;
- rmem_chunk->mem_area->allocated += 1;
-outa_here:
+ return g_realloc (mem, n_blocks * n_block_bytes);
+}
- LEAVE_MEM_CHUNK_ROUTINE();
+/**
+ * g_try_malloc_n:
+ * @n_blocks: the number of blocks to allocate
+ * @n_block_bytes: the size of each block in bytes
+ *
+ * This function is similar to g_try_malloc(), allocating (@n_blocks * @n_block_bytes) bytes,
+ * but care is taken to detect possible overflow during multiplication.
+ *
+ * Since: 2.24
+ * Returns: the allocated memory, or %NULL.
+ */
+gpointer
+g_try_malloc_n (gsize n_blocks,
+ gsize n_block_bytes)
+{
+ if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))
+ return NULL;
- return mem;
+ return g_try_malloc (n_blocks * n_block_bytes);
}
+/**
+ * g_try_malloc0_n:
+ * @n_blocks: the number of blocks to allocate
+ * @n_block_bytes: the size of each block in bytes
+ *
+ * This function is similar to g_try_malloc0(), allocating (@n_blocks * @n_block_bytes) bytes,
+ * but care is taken to detect possible overflow during multiplication.
+ *
+ * Since: 2.24
+ * Returns: the allocated memory, or %NULL
+ */
gpointer
-g_mem_chunk_alloc0 (GMemChunk *mem_chunk)
+g_try_malloc0_n (gsize n_blocks,
+ gsize n_block_bytes)
{
- gpointer mem;
+ if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))
+ return NULL;
- mem = g_mem_chunk_alloc (mem_chunk);
- if (mem)
- {
- GRealMemChunk *rmem_chunk = (GRealMemChunk*) mem_chunk;
+ return g_try_malloc0 (n_blocks * n_block_bytes);
+}
- memset (mem, 0, rmem_chunk->atom_size);
- }
+/**
+ * g_try_realloc_n:
+ * @mem: (allow-none): previously-allocated memory, or %NULL.
+ * @n_blocks: the number of blocks to allocate
+ * @n_block_bytes: the size of each block in bytes
+ *
+ * This function is similar to g_try_realloc(), allocating (@n_blocks * @n_block_bytes) bytes,
+ * but care is taken to detect possible overflow during multiplication.
+ *
+ * Since: 2.24
+ * Returns: the allocated memory, or %NULL.
+ */
+gpointer
+g_try_realloc_n (gpointer mem,
+ gsize n_blocks,
+ gsize n_block_bytes)
+{
+ if (SIZE_OVERFLOWS (n_blocks, n_block_bytes))
+ return NULL;
- return mem;
+ return g_try_realloc (mem, n_blocks * n_block_bytes);
}
-void
-g_mem_chunk_free (GMemChunk *mem_chunk,
- gpointer mem)
+
+
+static gpointer
+fallback_calloc (gsize n_blocks,
+ gsize n_block_bytes)
{
- GRealMemChunk *rmem_chunk;
- GMemArea *temp_area;
- GFreeAtom *free_atom;
-
- g_return_if_fail (mem_chunk != NULL);
- g_return_if_fail (mem != NULL);
+ gsize l = n_blocks * n_block_bytes;
+ gpointer mem = glib_mem_vtable.malloc (l);
- ENTER_MEM_CHUNK_ROUTINE();
+ if (mem)
+ memset (mem, 0, l);
- rmem_chunk = (GRealMemChunk*) mem_chunk;
-
- /* Don't do anything if this is an ALLOC_ONLY chunk
- */
- if (rmem_chunk->type == G_ALLOC_AND_FREE)
- {
- /* Place the memory on the "free_atoms" list
- */
- free_atom = (GFreeAtom*) mem;
- free_atom->next = rmem_chunk->free_atoms;
- rmem_chunk->free_atoms = free_atom;
-
- temp_area = g_tree_search (rmem_chunk->mem_tree,
- (GSearchFunc) g_mem_chunk_area_search,
- mem);
-
- temp_area->allocated -= 1;
-
- if (temp_area->allocated == 0)
- {
- temp_area->mark = 1;
- rmem_chunk->num_marked_areas += 1;
- }
- }
+ return mem;
+}
- LEAVE_MEM_CHUNK_ROUTINE();
+static gboolean vtable_set = FALSE;
+
+/**
+ * g_mem_is_system_malloc:
+ *
+ * Checks whether the allocator used by g_malloc() is the system's
+ * malloc implementation. If it returns %TRUE memory allocated with
+ * malloc() can be used interchangeable with memory allocated using g_malloc().
+ * This function is useful for avoiding an extra copy of allocated memory returned
+ * by a non-GLib-based API.
+ *
+ * A different allocator can be set using g_mem_set_vtable().
+ *
+ * Returns: if %TRUE, malloc() and g_malloc() can be mixed.
+ **/
+gboolean
+g_mem_is_system_malloc (void)
+{
+ return !vtable_set;
}
-/* This doesn't free the free_area if there is one */
+/**
+ * g_mem_set_vtable:
+ * @vtable: table of memory allocation routines.
+ *
+ * Sets the #GMemVTable to use for memory allocation. You can use this
+ * to provide custom memory allocation routines.
+ *
+ * The @vtable only needs to provide malloc(), realloc(), and free()
+ * functions; GLib can provide default implementations of the others.
+ * The malloc() and realloc() implementations should return %NULL on
+ * failure, GLib will handle error-checking for you. @vtable is copied,
+ * so need not persist after this function has been called.
+ *
+ * Note that this function must be called before using any other GLib
+ * functions.
+ */
void
-g_mem_chunk_clean (GMemChunk *mem_chunk)
+g_mem_set_vtable (GMemVTable *vtable)
{
- GRealMemChunk *rmem_chunk;
- GMemArea *mem_area;
- GFreeAtom *prev_free_atom;
- GFreeAtom *temp_free_atom;
- gpointer mem;
-
- g_return_if_fail (mem_chunk != NULL);
-
- rmem_chunk = (GRealMemChunk*) mem_chunk;
-
- if (rmem_chunk->type == G_ALLOC_AND_FREE)
+ if (!vtable_set)
{
- prev_free_atom = NULL;
- temp_free_atom = rmem_chunk->free_atoms;
-
- while (temp_free_atom)
+ if (vtable->malloc && vtable->realloc && vtable->free)
{
- mem = (gpointer) temp_free_atom;
-
- mem_area = g_tree_search (rmem_chunk->mem_tree,
- (GSearchFunc) g_mem_chunk_area_search,
- mem);
-
- /* If this mem area is marked for destruction then delete the
- * area and list node and decrement the free mem.
- */
- if (mem_area->mark)
- {
- if (prev_free_atom)
- prev_free_atom->next = temp_free_atom->next;
- else
- rmem_chunk->free_atoms = temp_free_atom->next;
- temp_free_atom = temp_free_atom->next;
-
- mem_area->free += rmem_chunk->atom_size;
- if (mem_area->free == rmem_chunk->area_size)
- {
- rmem_chunk->num_mem_areas -= 1;
- rmem_chunk->num_marked_areas -= 1;
-
- if (mem_area->next)
- mem_area->next->prev = mem_area->prev;
- if (mem_area->prev)
- mem_area->prev->next = mem_area->next;
- if (mem_area == rmem_chunk->mem_areas)
- rmem_chunk->mem_areas = rmem_chunk->mem_areas->next;
- if (mem_area == rmem_chunk->mem_area)
- rmem_chunk->mem_area = NULL;
-
- if (rmem_chunk->type == G_ALLOC_AND_FREE)
- g_tree_remove (rmem_chunk->mem_tree, mem_area);
- g_free (mem_area);
- }
- }
- else
- {
- prev_free_atom = temp_free_atom;
- temp_free_atom = temp_free_atom->next;
- }
+ glib_mem_vtable.malloc = vtable->malloc;
+ glib_mem_vtable.realloc = vtable->realloc;
+ glib_mem_vtable.free = vtable->free;
+ glib_mem_vtable.calloc = vtable->calloc ? vtable->calloc : fallback_calloc;
+ glib_mem_vtable.try_malloc = vtable->try_malloc ? vtable->try_malloc : glib_mem_vtable.malloc;
+ glib_mem_vtable.try_realloc = vtable->try_realloc ? vtable->try_realloc : glib_mem_vtable.realloc;
+ vtable_set = TRUE;
}
+ else
+ g_warning (G_STRLOC ": memory allocation vtable lacks one of malloc(), realloc() or free()");
}
+ else
+ g_warning (G_STRLOC ": memory allocation vtable can only be set once at startup");
}
+
+/* --- memory profiling and checking --- */
+#ifdef G_DISABLE_CHECKS
+/**
+ * glib_mem_profiler_table:
+ *
+ * A #GMemVTable containing profiling variants of the memory
+ * allocation functions. Use them together with g_mem_profile()
+ * in order to get information about the memory allocation pattern
+ * of your program.
+ */
+GMemVTable *glib_mem_profiler_table = &glib_mem_vtable;
void
-g_mem_chunk_reset (GMemChunk *mem_chunk)
+g_mem_profile (void)
{
- GRealMemChunk *rmem_chunk;
- GMemArea *mem_areas;
- GMemArea *temp_area;
-
- g_return_if_fail (mem_chunk != NULL);
-
- rmem_chunk = (GRealMemChunk*) mem_chunk;
-
- mem_areas = rmem_chunk->mem_areas;
- rmem_chunk->num_mem_areas = 0;
- rmem_chunk->mem_areas = NULL;
- rmem_chunk->mem_area = NULL;
-
- while (mem_areas)
+}
+#else /* !G_DISABLE_CHECKS */
+typedef enum {
+ PROFILER_FREE = 0,
+ PROFILER_ALLOC = 1,
+ PROFILER_RELOC = 2,
+ PROFILER_ZINIT = 4
+} ProfilerJob;
+static guint *profile_data = NULL;
+static gsize profile_allocs = 0;
+static gsize profile_zinit = 0;
+static gsize profile_frees = 0;
+static GMutex gmem_profile_mutex;
+
+#define PROFILE_TABLE(f1,f2,f3) ( ( ((f3) << 2) | ((f2) << 1) | (f1) ) * (MEM_PROFILE_TABLE_SIZE + 1))
+
+static void
+profiler_log (ProfilerJob job,
+ gsize n_bytes,
+ gboolean success)
+{
+ g_mutex_lock (&gmem_profile_mutex);
+ if (!profile_data)
{
- temp_area = mem_areas;
- mem_areas = mem_areas->next;
- g_free (temp_area);
+ profile_data = calloc ((MEM_PROFILE_TABLE_SIZE + 1) * 8,
+ sizeof (profile_data[0]));
+ if (!profile_data) /* memory system kiddin' me, eh? */
+ {
+ g_mutex_unlock (&gmem_profile_mutex);
+ return;
+ }
}
-
- rmem_chunk->free_atoms = NULL;
-
- if (rmem_chunk->mem_tree)
- g_tree_destroy (rmem_chunk->mem_tree);
- rmem_chunk->mem_tree = g_tree_new ((GCompareFunc) g_mem_chunk_area_compare);
+
+ if (n_bytes < MEM_PROFILE_TABLE_SIZE)
+ profile_data[n_bytes + PROFILE_TABLE ((job & PROFILER_ALLOC) != 0,
+ (job & PROFILER_RELOC) != 0,
+ success != 0)] += 1;
+ else
+ profile_data[MEM_PROFILE_TABLE_SIZE + PROFILE_TABLE ((job & PROFILER_ALLOC) != 0,
+ (job & PROFILER_RELOC) != 0,
+ success != 0)] += 1;
+ if (success)
+ {
+ if (job & PROFILER_ALLOC)
+ {
+ profile_allocs += n_bytes;
+ if (job & PROFILER_ZINIT)
+ profile_zinit += n_bytes;
+ }
+ else
+ profile_frees += n_bytes;
+ }
+ g_mutex_unlock (&gmem_profile_mutex);
}
-void
-g_mem_chunk_print (GMemChunk *mem_chunk)
+static void
+profile_print_locked (guint *local_data,
+ gboolean success)
{
- GRealMemChunk *rmem_chunk;
- GMemArea *mem_areas;
- gulong mem;
-
- g_return_if_fail (mem_chunk != NULL);
-
- rmem_chunk = (GRealMemChunk*) mem_chunk;
- mem_areas = rmem_chunk->mem_areas;
- mem = 0;
-
- while (mem_areas)
+ gboolean need_header = TRUE;
+ guint i;
+
+ for (i = 0; i <= MEM_PROFILE_TABLE_SIZE; i++)
{
- mem += rmem_chunk->area_size - mem_areas->free;
- mem_areas = mem_areas->next;
+ glong t_malloc = local_data[i + PROFILE_TABLE (1, 0, success)];
+ glong t_realloc = local_data[i + PROFILE_TABLE (1, 1, success)];
+ glong t_free = local_data[i + PROFILE_TABLE (0, 0, success)];
+ glong t_refree = local_data[i + PROFILE_TABLE (0, 1, success)];
+
+ if (!t_malloc && !t_realloc && !t_free && !t_refree)
+ continue;
+ else if (need_header)
+ {
+ need_header = FALSE;
+ g_print (" blocks of | allocated | freed | allocated | freed | n_bytes \n");
+ g_print (" n_bytes | n_times by | n_times by | n_times by | n_times by | remaining \n");
+ g_print (" | malloc() | free() | realloc() | realloc() | \n");
+ g_print ("===========|============|============|============|============|===========\n");
+ }
+ if (i < MEM_PROFILE_TABLE_SIZE)
+ g_print ("%10u | %10ld | %10ld | %10ld | %10ld |%+11ld\n",
+ i, t_malloc, t_free, t_realloc, t_refree,
+ (t_malloc - t_free + t_realloc - t_refree) * i);
+ else if (i >= MEM_PROFILE_TABLE_SIZE)
+ g_print (" >%6u | %10ld | %10ld | %10ld | %10ld | ***\n",
+ i, t_malloc, t_free, t_realloc, t_refree);
}
-
- g_log (g_log_domain_glib, G_LOG_LEVEL_INFO,
- "%s: %ld bytes using %d mem areas",
- rmem_chunk->name, mem, rmem_chunk->num_mem_areas);
+ if (need_header)
+ g_print (" --- none ---\n");
}
+/**
+ * g_mem_profile:
+ *
+ * Outputs a summary of memory usage.
+ *
+ * It outputs the frequency of allocations of different sizes,
+ * the total number of bytes which have been allocated,
+ * the total number of bytes which have been freed,
+ * and the difference between the previous two values, i.e. the number of bytes
+ * still in use.
+ *
+ * Note that this function will not output anything unless you have
+ * previously installed the #glib_mem_profiler_table with g_mem_set_vtable().
+ */
+
void
-g_mem_chunk_info (void)
+g_mem_profile (void)
{
- GRealMemChunk *mem_chunk;
- gint count;
-
- count = 0;
- g_mutex_lock (mem_chunks_lock);
- mem_chunk = mem_chunks;
- while (mem_chunk)
+ guint local_data[(MEM_PROFILE_TABLE_SIZE + 1) * 8];
+ gsize local_allocs;
+ gsize local_zinit;
+ gsize local_frees;
+
+ g_mutex_lock (&gmem_profile_mutex);
+
+ local_allocs = profile_allocs;
+ local_zinit = profile_zinit;
+ local_frees = profile_frees;
+
+ if (!profile_data)
{
- count += 1;
- mem_chunk = mem_chunk->next;
+ g_mutex_unlock (&gmem_profile_mutex);
+ return;
}
- g_mutex_unlock (mem_chunks_lock);
-
- g_log (g_log_domain_glib, G_LOG_LEVEL_INFO, "%d mem chunks", count);
-
- g_mutex_lock (mem_chunks_lock);
- mem_chunk = mem_chunks;
- g_mutex_unlock (mem_chunks_lock);
- while (mem_chunk)
- {
- g_mem_chunk_print ((GMemChunk*) mem_chunk);
- mem_chunk = mem_chunk->next;
- }
+ memcpy (local_data, profile_data,
+ (MEM_PROFILE_TABLE_SIZE + 1) * 8 * sizeof (profile_data[0]));
+
+ g_mutex_unlock (&gmem_profile_mutex);
+
+ g_print ("GLib Memory statistics (successful operations):\n");
+ profile_print_locked (local_data, TRUE);
+ g_print ("GLib Memory statistics (failing operations):\n");
+ profile_print_locked (local_data, FALSE);
+ g_print ("Total bytes: allocated=%"G_GSIZE_FORMAT", "
+ "zero-initialized=%"G_GSIZE_FORMAT" (%.2f%%), "
+ "freed=%"G_GSIZE_FORMAT" (%.2f%%), "
+ "remaining=%"G_GSIZE_FORMAT"\n",
+ local_allocs,
+ local_zinit,
+ ((gdouble) local_zinit) / local_allocs * 100.0,
+ local_frees,
+ ((gdouble) local_frees) / local_allocs * 100.0,
+ local_allocs - local_frees);
}
-void
-g_blow_chunks (void)
+static gpointer
+profiler_try_malloc (gsize n_bytes)
{
- GRealMemChunk *mem_chunk;
-
- g_mutex_lock (mem_chunks_lock);
- mem_chunk = mem_chunks;
- g_mutex_unlock (mem_chunks_lock);
- while (mem_chunk)
+ gsize *p;
+
+ p = malloc (sizeof (gsize) * 2 + n_bytes);
+
+ if (p)
{
- g_mem_chunk_clean ((GMemChunk*) mem_chunk);
- mem_chunk = mem_chunk->next;
+ p[0] = 0; /* free count */
+ p[1] = n_bytes; /* length */
+ profiler_log (PROFILER_ALLOC, n_bytes, TRUE);
+ p += 2;
}
+ else
+ profiler_log (PROFILER_ALLOC, n_bytes, FALSE);
+
+ return p;
}
-
-static gulong
-g_mem_chunk_compute_size (gulong size)
+static gpointer
+profiler_malloc (gsize n_bytes)
{
- gulong power_of_2;
- gulong lower, upper;
-
- power_of_2 = 16;
- while (power_of_2 < size)
- power_of_2 <<= 1;
-
- lower = power_of_2 >> 1;
- upper = power_of_2;
-
- if ((size - lower) < (upper - size))
- return lower;
- return upper;
+ gpointer mem = profiler_try_malloc (n_bytes);
+
+ if (!mem)
+ g_mem_profile ();
+
+ return mem;
}
-static gint
-g_mem_chunk_area_compare (GMemArea *a,
- GMemArea *b)
+static gpointer
+profiler_calloc (gsize n_blocks,
+ gsize n_block_bytes)
{
- return (a->mem - b->mem);
+ gsize l = n_blocks * n_block_bytes;
+ gsize *p;
+
+ p = calloc (1, sizeof (gsize) * 2 + l);
+
+ if (p)
+ {
+ p[0] = 0; /* free count */
+ p[1] = l; /* length */
+ profiler_log (PROFILER_ALLOC | PROFILER_ZINIT, l, TRUE);
+ p += 2;
+ }
+ else
+ {
+ profiler_log (PROFILER_ALLOC | PROFILER_ZINIT, l, FALSE);
+ g_mem_profile ();
+ }
+
+ return p;
}
-static gint
-g_mem_chunk_area_search (GMemArea *a,
- gchar *addr)
+static void
+profiler_free (gpointer mem)
{
- if (a->mem <= addr)
+ gsize *p = mem;
+
+ p -= 2;
+ if (p[0]) /* free count */
{
- if (addr < &a->mem[a->index])
- return 0;
- return 1;
+ g_warning ("free(%p): memory has been freed %"G_GSIZE_FORMAT" times already",
+ p + 2, p[0]);
+ profiler_log (PROFILER_FREE,
+ p[1], /* length */
+ FALSE);
}
- return -1;
+ else
+ {
+ profiler_log (PROFILER_FREE,
+ p[1], /* length */
+ TRUE);
+ memset (p + 2, 0xaa, p[1]);
+
+ /* for all those that miss free (p); in this place, yes,
+ * we do leak all memory when profiling, and that is intentional
+ * to catch double frees. patch submissions are futile.
+ */
+ }
+ p[0] += 1;
}
-/* generic allocators
- */
-struct _GAllocator /* from gmem.c */
+static gpointer
+profiler_try_realloc (gpointer mem,
+ gsize n_bytes)
{
- gchar *name;
- guint16 n_preallocs;
- guint is_unused : 1;
- guint type : 4;
- GAllocator *last;
- GMemChunk *mem_chunk;
- gpointer dummy; /* implementation specific */
-};
+ gsize *p = mem;
-GAllocator*
-g_allocator_new (const gchar *name,
- guint n_preallocs)
-{
- GAllocator *allocator;
+ p -= 2;
+
+ if (mem && p[0]) /* free count */
+ {
+ g_warning ("realloc(%p, %"G_GSIZE_FORMAT"): "
+ "memory has been freed %"G_GSIZE_FORMAT" times already",
+ p + 2, (gsize) n_bytes, p[0]);
+ profiler_log (PROFILER_ALLOC | PROFILER_RELOC, n_bytes, FALSE);
- g_return_val_if_fail (name != NULL, NULL);
+ return NULL;
+ }
+ else
+ {
+ p = realloc (mem ? p : NULL, sizeof (gsize) * 2 + n_bytes);
- allocator = g_new0 (GAllocator, 1);
- allocator->name = g_strdup (name);
- allocator->n_preallocs = CLAMP (n_preallocs, 1, 65535);
- allocator->is_unused = TRUE;
- allocator->type = 0;
- allocator->last = NULL;
- allocator->mem_chunk = NULL;
- allocator->dummy = NULL;
+ if (p)
+ {
+ if (mem)
+ profiler_log (PROFILER_FREE | PROFILER_RELOC, p[1], TRUE);
+ p[0] = 0;
+ p[1] = n_bytes;
+ profiler_log (PROFILER_ALLOC | PROFILER_RELOC, p[1], TRUE);
+ p += 2;
+ }
+ else
+ profiler_log (PROFILER_ALLOC | PROFILER_RELOC, n_bytes, FALSE);
- return allocator;
+ return p;
+ }
}
-void
-g_allocator_free (GAllocator *allocator)
+static gpointer
+profiler_realloc (gpointer mem,
+ gsize n_bytes)
{
- g_return_if_fail (allocator != NULL);
- g_return_if_fail (allocator->is_unused == TRUE);
+ mem = profiler_try_realloc (mem, n_bytes);
- g_free (allocator->name);
- if (allocator->mem_chunk)
- g_mem_chunk_destroy (allocator->mem_chunk);
+ if (!mem)
+ g_mem_profile ();
- g_free (allocator);
+ return mem;
}
-void
-g_mem_init (void)
-{
- mem_chunks_lock = g_mutex_new();
-#ifdef ENABLE_MEM_PROFILE
- mem_profile_lock = g_mutex_new();
- allocating_for_mem_chunk = g_private_new(NULL);
-#endif
-}
+static GMemVTable profiler_table = {
+ profiler_malloc,
+ profiler_realloc,
+ profiler_free,
+ profiler_calloc,
+ profiler_try_malloc,
+ profiler_try_realloc,
+};
+GMemVTable *glib_mem_profiler_table = &profiler_table;
+
+#endif /* !G_DISABLE_CHECKS */
projects / platform / upstream / glib.git / blobdiff