#endif
#endif
+/* Special macros that are no-ops except when run under Valgrind on
+ * x86. They've moved a little bit from valgrind 1.0.4 to 1.9.4 */
+#ifdef HAVE_VALGRIND_MEMCHECK_H
+ /* memcheck.h includes valgrind.h */
+#include <valgrind/memcheck.h>
+#elif defined(HAVE_VALGRIND_H)
+#include <valgrind.h>
+#endif
+
/* use this to force every realloc to change the pointer, to stress test
code that might not cope */
#define ALWAYS_REALLOC 0
static void *null_context;
static void *autofree_context;
+/* used to enable fill of memory on free, which can be useful for
+ * catching use after free errors when valgrind is too slow
+ */
+static struct {
+ bool initialised;
+ bool enabled;
+ uint8_t fill_value;
+} talloc_fill;
+
+#define TALLOC_FILL_ENV "TALLOC_FREE_FILL"
+
+/*
+ * do not wipe the header, to allow the
+ * double-free logic to still work
+ */
+#define TC_INVALIDATE_FULL_FILL_CHUNK(_tc) do { \
+ if (unlikely(talloc_fill.enabled)) { \
+ size_t _flen = (_tc)->size; \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ memset(_fptr, talloc_fill.fill_value, _flen); \
+ } \
+} while (0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
+/* Mark the whole chunk as not accessable */
+#define TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc) do { \
+ size_t _flen = TC_HDR_SIZE + (_tc)->size; \
+ char *_fptr = (char *)(_tc); \
+ VALGRIND_MAKE_MEM_NOACCESS(_fptr, _flen); \
+} while(0)
+#else
+#define TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc) do { } while (0)
+#endif
+
+#define TC_INVALIDATE_FULL_CHUNK(_tc) do { \
+ TC_INVALIDATE_FULL_FILL_CHUNK(_tc); \
+ TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc); \
+} while (0)
+
+#define TC_INVALIDATE_SHRINK_FILL_CHUNK(_tc, _new_size) do { \
+ if (unlikely(talloc_fill.enabled)) { \
+ size_t _flen = (_tc)->size - (_new_size); \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ _fptr += (_new_size); \
+ memset(_fptr, talloc_fill.fill_value, _flen); \
+ } \
+} while (0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
+/* Mark the unused bytes not accessable */
+#define TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { \
+ size_t _flen = (_tc)->size - (_new_size); \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ _fptr += (_new_size); \
+ VALGRIND_MAKE_MEM_NOACCESS(_fptr, _flen); \
+} while (0)
+#else
+#define TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { } while (0)
+#endif
+
+#define TC_INVALIDATE_SHRINK_CHUNK(_tc, _new_size) do { \
+ TC_INVALIDATE_SHRINK_FILL_CHUNK(_tc, _new_size); \
+ TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size); \
+} while (0)
+
+#define TC_UNDEFINE_SHRINK_FILL_CHUNK(_tc, _new_size) do { \
+ if (unlikely(talloc_fill.enabled)) { \
+ size_t _flen = (_tc)->size - (_new_size); \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ _fptr += (_new_size); \
+ memset(_fptr, talloc_fill.fill_value, _flen); \
+ } \
+} while (0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+/* Mark the unused bytes as undefined */
+#define TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { \
+ size_t _flen = (_tc)->size - (_new_size); \
+ char *_fptr = (char *)TC_PTR_FROM_CHUNK(_tc); \
+ _fptr += (_new_size); \
+ VALGRIND_MAKE_MEM_UNDEFINED(_fptr, _flen); \
+} while (0)
+#else
+#define TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { } while (0)
+#endif
+
+#define TC_UNDEFINE_SHRINK_CHUNK(_tc, _new_size) do { \
+ TC_UNDEFINE_SHRINK_FILL_CHUNK(_tc, _new_size); \
+ TC_UNDEFINE_SHRINK_VALGRIND_CHUNK(_tc, _new_size); \
+} while (0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+/* Mark the new bytes as undefined */
+#define TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size) do { \
+ size_t _old_used = TC_HDR_SIZE + (_tc)->size; \
+ size_t _new_used = TC_HDR_SIZE + (_new_size); \
+ size_t _flen = _new_used - _old_used; \
+ char *_fptr = _old_used + (char *)(_tc); \
+ VALGRIND_MAKE_MEM_UNDEFINED(_fptr, _flen); \
+} while (0)
+#else
+#define TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size) do { } while (0)
+#endif
+
+#define TC_UNDEFINE_GROW_CHUNK(_tc, _new_size) do { \
+ TC_UNDEFINE_GROW_VALGRIND_CHUNK(_tc, _new_size); \
+} while (0)
+
struct talloc_reference_handle {
struct talloc_reference_handle *next, *prev;
void *ptr;
};
/* 16 byte alignment seems to keep everyone happy */
-#define TC_HDR_SIZE ((sizeof(struct talloc_chunk)+15)&~15)
+#define TC_ALIGN16(s) (((s)+15)&~15)
+#define TC_HDR_SIZE TC_ALIGN16(sizeof(struct talloc_chunk))
#define TC_PTR_FROM_CHUNK(tc) ((void *)(TC_HDR_SIZE + (char*)tc))
-int talloc_version_major(void)
+_PUBLIC_ int talloc_version_major(void)
{
return TALLOC_VERSION_MAJOR;
}
-int talloc_version_minor(void)
+_PUBLIC_ int talloc_version_minor(void)
{
return TALLOC_VERSION_MINOR;
}
static void (*talloc_log_fn)(const char *message);
-void talloc_set_log_fn(void (*log_fn)(const char *message))
+_PUBLIC_ void talloc_set_log_fn(void (*log_fn)(const char *message))
{
talloc_log_fn = log_fn;
}
fprintf(stderr, "%s", message);
}
-void talloc_set_log_stderr(void)
+_PUBLIC_ void talloc_set_log_stderr(void)
{
talloc_set_log_fn(talloc_log_stderr);
}
static void (*talloc_abort_fn)(const char *reason);
-void talloc_set_abort_fn(void (*abort_fn)(const char *reason))
+_PUBLIC_ void talloc_set_abort_fn(void (*abort_fn)(const char *reason))
{
talloc_abort_fn = abort_fn;
}
talloc_abort("Bad talloc magic value - wrong talloc version used/mixed");
}
-static void talloc_abort_double_free(void)
+static void talloc_abort_access_after_free(void)
{
- talloc_abort("Bad talloc magic value - double free");
+ talloc_abort("Bad talloc magic value - access after free");
}
static void talloc_abort_unknown_value(void)
}
if (tc->flags & TALLOC_FLAG_FREE) {
- talloc_log("talloc: double free error - first free may be at %s\n", tc->name);
- talloc_abort_double_free();
+ talloc_log("talloc: access after free error - first free may be at %s\n", tc->name);
+ talloc_abort_access_after_free();
return NULL;
} else {
talloc_abort_unknown_value();
return tc->parent;
}
-void *talloc_parent(const void *ptr)
+_PUBLIC_ void *talloc_parent(const void *ptr)
{
struct talloc_chunk *tc = talloc_parent_chunk(ptr);
return tc? TC_PTR_FROM_CHUNK(tc) : NULL;
/*
find parents name
*/
-const char *talloc_parent_name(const void *ptr)
+_PUBLIC_ const char *talloc_parent_name(const void *ptr)
{
struct talloc_chunk *tc = talloc_parent_chunk(ptr);
return tc? tc->name : NULL;
#define TALLOC_POOL_HDR_SIZE 16
+#define TC_POOL_SPACE_LEFT(_pool_tc) \
+ PTR_DIFF(TC_HDR_SIZE + (_pool_tc)->size + (char *)(_pool_tc), \
+ (_pool_tc)->pool)
+
+#define TC_POOL_FIRST_CHUNK(_pool_tc) \
+ ((void *)(TC_HDR_SIZE + TALLOC_POOL_HDR_SIZE + (char *)(_pool_tc)))
+
+#define TC_POOLMEM_CHUNK_SIZE(_tc) \
+ TC_ALIGN16(TC_HDR_SIZE + (_tc)->size)
+
+#define TC_POOLMEM_NEXT_CHUNK(_tc) \
+ ((void *)(TC_POOLMEM_CHUNK_SIZE(tc) + (char*)(_tc)))
+
+/* Mark the whole remaining pool as not accessable */
+#define TC_INVALIDATE_FILL_POOL(_pool_tc) do { \
+ if (unlikely(talloc_fill.enabled)) { \
+ size_t _flen = TC_POOL_SPACE_LEFT(_pool_tc); \
+ char *_fptr = (char *)(_pool_tc)->pool; \
+ memset(_fptr, talloc_fill.fill_value, _flen); \
+ } \
+} while(0)
+
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
+/* Mark the whole remaining pool as not accessable */
+#define TC_INVALIDATE_VALGRIND_POOL(_pool_tc) do { \
+ size_t _flen = TC_POOL_SPACE_LEFT(_pool_tc); \
+ char *_fptr = (char *)(_pool_tc)->pool; \
+ VALGRIND_MAKE_MEM_NOACCESS(_fptr, _flen); \
+} while(0)
+#else
+#define TC_INVALIDATE_VALGRIND_POOL(_pool_tc) do { } while (0)
+#endif
+
+#define TC_INVALIDATE_POOL(_pool_tc) do { \
+ TC_INVALIDATE_FILL_POOL(_pool_tc); \
+ TC_INVALIDATE_VALGRIND_POOL(_pool_tc); \
+} while (0)
+
static unsigned int *talloc_pool_objectcount(struct talloc_chunk *tc)
{
- return (unsigned int *)((char *)tc + sizeof(struct talloc_chunk));
+ return (unsigned int *)((char *)tc + TC_HDR_SIZE);
}
/*
return NULL;
}
- space_left = ((char *)pool_ctx + TC_HDR_SIZE + pool_ctx->size)
- - ((char *)pool_ctx->pool);
+ space_left = TC_POOL_SPACE_LEFT(pool_ctx);
/*
* Align size to 16 bytes
*/
- chunk_size = ((size + 15) & ~15);
+ chunk_size = TC_ALIGN16(size);
if (space_left < chunk_size) {
return NULL;
* Create a talloc pool
*/
-void *talloc_pool(const void *context, size_t size)
+_PUBLIC_ void *talloc_pool(const void *context, size_t size)
{
void *result = __talloc(context, size + TALLOC_POOL_HDR_SIZE);
struct talloc_chunk *tc;
tc = talloc_chunk_from_ptr(result);
tc->flags |= TALLOC_FLAG_POOL;
- tc->pool = (char *)result + TALLOC_POOL_HDR_SIZE;
+ tc->pool = TC_POOL_FIRST_CHUNK(tc);
*talloc_pool_objectcount(tc) = 1;
-#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
- VALGRIND_MAKE_MEM_NOACCESS(tc->pool, size);
-#endif
+ TC_INVALIDATE_POOL(tc);
return result;
}
if the destructor fails then the free is failed, and the memory can
be continued to be used
*/
-void _talloc_set_destructor(const void *ptr, int (*destructor)(void *))
+_PUBLIC_ void _talloc_set_destructor(const void *ptr, int (*destructor)(void *))
{
struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
tc->destructor = destructor;
/*
increase the reference count on a piece of memory.
*/
-int talloc_increase_ref_count(const void *ptr)
+_PUBLIC_ int talloc_increase_ref_count(const void *ptr)
{
if (unlikely(!talloc_reference(null_context, ptr))) {
return -1;
same underlying data, and you want to be able to free the two instances separately,
and in either order
*/
-void *_talloc_reference_loc(const void *context, const void *ptr, const char *location)
+_PUBLIC_ void *_talloc_reference_loc(const void *context, const void *ptr, const char *location)
{
struct talloc_chunk *tc;
struct talloc_reference_handle *handle;
static void *_talloc_steal_internal(const void *new_ctx, const void *ptr);
+static inline void _talloc_free_poolmem(struct talloc_chunk *tc,
+ const char *location)
+{
+ struct talloc_chunk *pool;
+ void *next_tc;
+ unsigned int *pool_object_count;
+
+ pool = (struct talloc_chunk *)tc->pool;
+ next_tc = TC_POOLMEM_NEXT_CHUNK(tc);
+
+ tc->flags |= TALLOC_FLAG_FREE;
+
+ /* we mark the freed memory with where we called the free
+ * from. This means on a double free error we can report where
+ * the first free came from
+ */
+ tc->name = location;
+
+ TC_INVALIDATE_FULL_CHUNK(tc);
+
+ pool_object_count = talloc_pool_objectcount(pool);
+
+ if (unlikely(*pool_object_count == 0)) {
+ talloc_abort("Pool object count zero!");
+ return;
+ }
+
+ *pool_object_count -= 1;
+
+ if (unlikely(*pool_object_count == 1 && !(pool->flags & TALLOC_FLAG_FREE))) {
+ /*
+ * if there is just one object left in the pool
+ * and pool->flags does not have TALLOC_FLAG_FREE,
+ * it means this is the pool itself and
+ * the rest is available for new objects
+ * again.
+ */
+ pool->pool = TC_POOL_FIRST_CHUNK(pool);
+ TC_INVALIDATE_POOL(pool);
+ } else if (unlikely(*pool_object_count == 0)) {
+ /*
+ * we mark the freed memory with where we called the free
+ * from. This means on a double free error we can report where
+ * the first free came from
+ */
+ pool->name = location;
+
+ TC_INVALIDATE_FULL_CHUNK(pool);
+ free(pool);
+ } else if (pool->pool == next_tc) {
+ /*
+ * if pool->pool still points to end of
+ * 'tc' (which is stored in the 'next_tc' variable),
+ * we can reclaim the memory of 'tc'.
+ */
+ pool->pool = tc;
+ }
+}
+
+static inline void _talloc_free_children_internal(struct talloc_chunk *tc,
+ void *ptr,
+ const char *location);
+
/*
internal talloc_free call
*/
return -1;
}
+ /* possibly initialised the talloc fill value */
+ if (unlikely(!talloc_fill.initialised)) {
+ const char *fill = getenv(TALLOC_FILL_ENV);
+ if (fill != NULL) {
+ talloc_fill.enabled = true;
+ talloc_fill.fill_value = strtoul(fill, NULL, 0);
+ }
+ talloc_fill.initialised = true;
+ }
+
tc = talloc_chunk_from_ptr(ptr);
if (unlikely(tc->refs)) {
int is_child;
- /* check this is a reference from a child or grantchild
- * back to it's parent or grantparent
+ /* check if this is a reference from a child or
+ * grandchild back to it's parent or grandparent
*
* in that case we need to remove the reference and
* call another instance of talloc_free() on the current
} else {
if (tc->prev) tc->prev->next = tc->next;
if (tc->next) tc->next->prev = tc->prev;
+ tc->prev = tc->next = NULL;
}
tc->flags |= TALLOC_FLAG_LOOP;
- while (tc->child) {
- /* we need to work out who will own an abandoned child
- if it cannot be freed. In priority order, the first
- choice is owner of any remaining reference to this
- pointer, the second choice is our parent, and the
- final choice is the null context. */
- void *child = TC_PTR_FROM_CHUNK(tc->child);
- const void *new_parent = null_context;
- if (unlikely(tc->child->refs)) {
- struct talloc_chunk *p = talloc_parent_chunk(tc->child->refs);
- if (p) new_parent = TC_PTR_FROM_CHUNK(p);
- }
- if (unlikely(_talloc_free_internal(child, location) == -1)) {
- if (new_parent == null_context) {
- struct talloc_chunk *p = talloc_parent_chunk(ptr);
- if (p) new_parent = TC_PTR_FROM_CHUNK(p);
- }
- _talloc_steal_internal(new_parent, child);
- }
- }
+ _talloc_free_children_internal(tc, ptr, location);
tc->flags |= TALLOC_FLAG_FREE;
*/
tc->name = location;
- if (tc->flags & (TALLOC_FLAG_POOL|TALLOC_FLAG_POOLMEM)) {
- struct talloc_chunk *pool;
+ if (tc->flags & TALLOC_FLAG_POOL) {
unsigned int *pool_object_count;
- pool = (tc->flags & TALLOC_FLAG_POOL)
- ? tc : (struct talloc_chunk *)tc->pool;
-
- pool_object_count = talloc_pool_objectcount(pool);
+ pool_object_count = talloc_pool_objectcount(tc);
- if (*pool_object_count == 0) {
+ if (unlikely(*pool_object_count == 0)) {
talloc_abort("Pool object count zero!");
return 0;
}
*pool_object_count -= 1;
- if (*pool_object_count == 0) {
- free(pool);
+ if (unlikely(*pool_object_count == 0)) {
+ TC_INVALIDATE_FULL_CHUNK(tc);
+ free(tc);
}
- }
- else {
+ } else if (tc->flags & TALLOC_FLAG_POOLMEM) {
+ _talloc_free_poolmem(tc, location);
+ } else {
+ TC_INVALIDATE_FULL_CHUNK(tc);
free(tc);
}
return 0;
} else {
if (tc->prev) tc->prev->next = tc->next;
if (tc->next) tc->next->prev = tc->prev;
+ tc->prev = tc->next = NULL;
}
tc->parent = new_tc;
ptr on success, or NULL if it could not be transferred.
passing NULL as ptr will always return NULL with no side effects.
*/
-void *_talloc_steal_loc(const void *new_ctx, const void *ptr, const char *location)
+_PUBLIC_ void *_talloc_steal_loc(const void *new_ctx, const void *ptr, const char *location)
{
struct talloc_chunk *tc;
h->location);
}
}
+
+#if 0
+ /* this test is probably too expensive to have on in the
+ normal build, but it useful for debugging */
+ if (talloc_is_parent(new_ctx, ptr)) {
+ talloc_log("WARNING: stealing into talloc child at %s\n", location);
+ }
+#endif
return _talloc_steal_internal(new_ctx, ptr);
}
The old parent can be either a reference or a parent
*/
-void *talloc_reparent(const void *old_parent, const void *new_parent, const void *ptr)
+_PUBLIC_ void *talloc_reparent(const void *old_parent, const void *new_parent, const void *ptr)
{
struct talloc_chunk *tc;
struct talloc_reference_handle *h;
remove a specific parent context from a pointer. This is a more
controlled varient of talloc_free()
*/
-int talloc_unlink(const void *context, void *ptr)
+_PUBLIC_ int talloc_unlink(const void *context, void *ptr)
{
struct talloc_chunk *tc_p, *new_p;
void *new_parent;
/*
add a name to an existing pointer
*/
-const char *talloc_set_name(const void *ptr, const char *fmt, ...)
+_PUBLIC_ const char *talloc_set_name(const void *ptr, const char *fmt, ...)
{
const char *name;
va_list ap;
talloc_named() operates just like talloc() except that it allows you
to name the pointer.
*/
-void *talloc_named(const void *context, size_t size, const char *fmt, ...)
+_PUBLIC_ void *talloc_named(const void *context, size_t size, const char *fmt, ...)
{
va_list ap;
void *ptr;
/*
return the name of a talloc ptr, or "UNNAMED"
*/
-const char *talloc_get_name(const void *ptr)
+_PUBLIC_ const char *talloc_get_name(const void *ptr)
{
struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
if (unlikely(tc->name == TALLOC_MAGIC_REFERENCE)) {
check if a pointer has the given name. If it does, return the pointer,
otherwise return NULL
*/
-void *talloc_check_name(const void *ptr, const char *name)
+_PUBLIC_ void *talloc_check_name(const void *ptr, const char *name)
{
const char *pname;
if (unlikely(ptr == NULL)) return NULL;
talloc_abort(reason);
}
-void *_talloc_get_type_abort(const void *ptr, const char *name, const char *location)
+_PUBLIC_ void *_talloc_get_type_abort(const void *ptr, const char *name, const char *location)
{
const char *pname;
/*
this is for compatibility with older versions of talloc
*/
-void *talloc_init(const char *fmt, ...)
+_PUBLIC_ void *talloc_init(const char *fmt, ...)
{
va_list ap;
void *ptr;
const char *name;
- /*
- * samba3 expects talloc_report_depth_cb(NULL, ...)
- * reports all talloc'ed memory, so we need to enable
- * null_tracking
- */
- talloc_enable_null_tracking();
-
ptr = __talloc(NULL, 0);
if (unlikely(ptr == NULL)) return NULL;
return ptr;
}
-/*
- this is a replacement for the Samba3 talloc_destroy_pool functionality. It
- should probably not be used in new code. It's in here to keep the talloc
- code consistent across Samba 3 and 4.
-*/
-void talloc_free_children(void *ptr)
+static inline void _talloc_free_children_internal(struct talloc_chunk *tc,
+ void *ptr,
+ const char *location)
{
- struct talloc_chunk *tc;
-
- if (unlikely(ptr == NULL)) {
- return;
- }
-
- tc = talloc_chunk_from_ptr(ptr);
-
while (tc->child) {
/* we need to work out who will own an abandoned child
if it cannot be freed. In priority order, the first
struct talloc_chunk *p = talloc_parent_chunk(tc->child->refs);
if (p) new_parent = TC_PTR_FROM_CHUNK(p);
}
- if (unlikely(talloc_free(child) == -1)) {
+ if (unlikely(_talloc_free_internal(child, location) == -1)) {
if (new_parent == null_context) {
struct talloc_chunk *p = talloc_parent_chunk(ptr);
if (p) new_parent = TC_PTR_FROM_CHUNK(p);
_talloc_steal_internal(new_parent, child);
}
}
+}
- if ((tc->flags & TALLOC_FLAG_POOL)
- && (*talloc_pool_objectcount(tc) == 1)) {
- tc->pool = ((char *)tc + TC_HDR_SIZE + TALLOC_POOL_HDR_SIZE);
-#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS)
- VALGRIND_MAKE_MEM_NOACCESS(
- tc->pool, tc->size - TALLOC_POOL_HDR_SIZE);
-#endif
+/*
+ this is a replacement for the Samba3 talloc_destroy_pool functionality. It
+ should probably not be used in new code. It's in here to keep the talloc
+ code consistent across Samba 3 and 4.
+*/
+_PUBLIC_ void talloc_free_children(void *ptr)
+{
+ struct talloc_chunk *tc_name = NULL;
+ struct talloc_chunk *tc;
+
+ if (unlikely(ptr == NULL)) {
+ return;
+ }
+
+ tc = talloc_chunk_from_ptr(ptr);
+
+ /* we do not want to free the context name if it is a child .. */
+ if (likely(tc->child)) {
+ for (tc_name = tc->child; tc_name; tc_name = tc_name->next) {
+ if (tc->name == TC_PTR_FROM_CHUNK(tc_name)) break;
+ }
+ if (tc_name) {
+ _TLIST_REMOVE(tc->child, tc_name);
+ if (tc->child) {
+ tc->child->parent = tc;
+ }
+ }
+ }
+
+ _talloc_free_children_internal(tc, ptr, __location__);
+
+ /* .. so we put it back after all other children have been freed */
+ if (tc_name) {
+ if (tc->child) {
+ tc->child->parent = NULL;
+ }
+ tc_name->parent = tc;
+ _TLIST_ADD(tc->child, tc_name);
}
}
/*
Allocate a bit of memory as a child of an existing pointer
*/
-void *_talloc(const void *context, size_t size)
+_PUBLIC_ void *_talloc(const void *context, size_t size)
{
return __talloc(context, size);
}
/*
externally callable talloc_set_name_const()
*/
-void talloc_set_name_const(const void *ptr, const char *name)
+_PUBLIC_ void talloc_set_name_const(const void *ptr, const char *name)
{
_talloc_set_name_const(ptr, name);
}
talloc_named() operates just like talloc() except that it allows you
to name the pointer.
*/
-void *talloc_named_const(const void *context, size_t size, const char *name)
+_PUBLIC_ void *talloc_named_const(const void *context, size_t size, const char *name)
{
return _talloc_named_const(context, size, name);
}
will not be freed if the ref_count is > 1 or the destructor (if
any) returns non-zero
*/
-int _talloc_free(void *ptr, const char *location)
+_PUBLIC_ int _talloc_free(void *ptr, const char *location)
{
struct talloc_chunk *tc;
if (unlikely(tc->refs != NULL)) {
struct talloc_reference_handle *h;
+ if (talloc_parent(ptr) == null_context && tc->refs->next == NULL) {
+ /* in this case we do know which parent should
+ get this pointer, as there is really only
+ one parent */
+ return talloc_unlink(null_context, ptr);
+ }
+
talloc_log("ERROR: talloc_free with references at %s\n",
location);
A talloc version of realloc. The context argument is only used if
ptr is NULL
*/
-void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *name)
+_PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *name)
{
struct talloc_chunk *tc;
void *new_ptr;
bool malloced = false;
+ struct talloc_chunk *pool_tc = NULL;
/* size zero is equivalent to free() */
if (unlikely(size == 0)) {
return NULL;
}
+ /* don't let anybody try to realloc a talloc_pool */
+ if (unlikely(tc->flags & TALLOC_FLAG_POOLMEM)) {
+ pool_tc = (struct talloc_chunk *)tc->pool;
+ }
+
+#if (ALWAYS_REALLOC == 0)
/* don't shrink if we have less than 1k to gain */
- if ((size < tc->size) && ((tc->size - size) < 1024)) {
- tc->size = size;
+ if (size < tc->size) {
+ if (pool_tc) {
+ void *next_tc = TC_POOLMEM_NEXT_CHUNK(tc);
+ TC_INVALIDATE_SHRINK_CHUNK(tc, size);
+ tc->size = size;
+ if (next_tc == pool_tc->pool) {
+ pool_tc->pool = TC_POOLMEM_NEXT_CHUNK(tc);
+ }
+ return ptr;
+ } else if ((tc->size - size) < 1024) {
+ /*
+ * if we call TC_INVALIDATE_SHRINK_CHUNK() here
+ * we would need to call TC_UNDEFINE_GROW_CHUNK()
+ * after each realloc call, which slows down
+ * testing a lot :-(.
+ *
+ * That is why we only mark memory as undefined here.
+ */
+ TC_UNDEFINE_SHRINK_CHUNK(tc, size);
+
+ /* do not shrink if we have less than 1k to gain */
+ tc->size = size;
+ return ptr;
+ }
+ } else if (tc->size == size) {
+ /*
+ * do not change the pointer if it is exactly
+ * the same size.
+ */
return ptr;
}
+#endif
/* by resetting magic we catch users of the old memory */
tc->flags |= TALLOC_FLAG_FREE;
#if ALWAYS_REALLOC
- new_ptr = malloc(size + TC_HDR_SIZE);
- if (new_ptr) {
- memcpy(new_ptr, tc, MIN(tc->size, size) + TC_HDR_SIZE);
- free(tc);
+ if (pool_tc) {
+ new_ptr = talloc_alloc_pool(tc, size + TC_HDR_SIZE);
+ *talloc_pool_objectcount(pool_tc) -= 1;
+
+ if (new_ptr == NULL) {
+ new_ptr = malloc(TC_HDR_SIZE+size);
+ malloced = true;
+ }
+
+ if (new_ptr) {
+ memcpy(new_ptr, tc, MIN(tc->size,size) + TC_HDR_SIZE);
+ TC_INVALIDATE_FULL_CHUNK(tc);
+ }
+ } else {
+ new_ptr = malloc(size + TC_HDR_SIZE);
+ if (new_ptr) {
+ memcpy(new_ptr, tc, MIN(tc->size, size) + TC_HDR_SIZE);
+ free(tc);
+ }
}
#else
- if (tc->flags & TALLOC_FLAG_POOLMEM) {
+ if (pool_tc) {
+ void *next_tc = TC_POOLMEM_NEXT_CHUNK(tc);
+ size_t old_chunk_size = TC_POOLMEM_CHUNK_SIZE(tc);
+ size_t new_chunk_size = TC_ALIGN16(TC_HDR_SIZE + size);
+ size_t space_needed;
+ size_t space_left;
+ unsigned int chunk_count = *talloc_pool_objectcount(pool_tc);
+
+ if (!(pool_tc->flags & TALLOC_FLAG_FREE)) {
+ chunk_count -= 1;
+ }
+
+ if (chunk_count == 1) {
+ /*
+ * optimize for the case where 'tc' is the only
+ * chunk in the pool.
+ */
+ space_needed = new_chunk_size;
+ space_left = pool_tc->size - TALLOC_POOL_HDR_SIZE;
+
+ if (space_left >= space_needed) {
+ size_t old_used = TC_HDR_SIZE + tc->size;
+ size_t new_used = TC_HDR_SIZE + size;
+ pool_tc->pool = TC_POOL_FIRST_CHUNK(pool_tc);
+#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_UNDEFINED)
+ /*
+ * we need to prepare the memmove into
+ * the unaccessable area.
+ */
+ {
+ size_t diff = PTR_DIFF(tc, pool_tc->pool);
+ size_t flen = MIN(diff, old_used);
+ char *fptr = (char *)pool_tc->pool;
+ VALGRIND_MAKE_MEM_UNDEFINED(fptr, flen);
+ }
+#endif
+ memmove(pool_tc->pool, tc, old_used);
+ new_ptr = pool_tc->pool;
+
+ tc = (struct talloc_chunk *)new_ptr;
+ TC_UNDEFINE_GROW_CHUNK(tc, size);
+
+ /*
+ * first we do not align the pool pointer
+ * because we want to invalidate the padding
+ * too.
+ */
+ pool_tc->pool = new_used + (char *)new_ptr;
+ TC_INVALIDATE_POOL(pool_tc);
+
+ /* now the aligned pointer */
+ pool_tc->pool = new_chunk_size + (char *)new_ptr;
+ goto got_new_ptr;
+ }
+
+ next_tc = NULL;
+ }
+
+ if (new_chunk_size == old_chunk_size) {
+ TC_UNDEFINE_GROW_CHUNK(tc, size);
+ tc->flags &= ~TALLOC_FLAG_FREE;
+ tc->size = size;
+ return ptr;
+ }
+
+ if (next_tc == pool_tc->pool) {
+ /*
+ * optimize for the case where 'tc' is the last
+ * chunk in the pool.
+ */
+ space_needed = new_chunk_size - old_chunk_size;
+ space_left = TC_POOL_SPACE_LEFT(pool_tc);
+
+ if (space_left >= space_needed) {
+ TC_UNDEFINE_GROW_CHUNK(tc, size);
+ tc->flags &= ~TALLOC_FLAG_FREE;
+ tc->size = size;
+ pool_tc->pool = TC_POOLMEM_NEXT_CHUNK(tc);
+ return ptr;
+ }
+ }
new_ptr = talloc_alloc_pool(tc, size + TC_HDR_SIZE);
- *talloc_pool_objectcount((struct talloc_chunk *)
- (tc->pool)) -= 1;
if (new_ptr == NULL) {
new_ptr = malloc(TC_HDR_SIZE+size);
if (new_ptr) {
memcpy(new_ptr, tc, MIN(tc->size,size) + TC_HDR_SIZE);
+
+ _talloc_free_poolmem(tc, __location__ "_talloc_realloc");
}
}
else {
new_ptr = realloc(tc, size + TC_HDR_SIZE);
}
+got_new_ptr:
#endif
if (unlikely(!new_ptr)) {
tc->flags &= ~TALLOC_FLAG_FREE;
a wrapper around talloc_steal() for situations where you are moving a pointer
between two structures, and want the old pointer to be set to NULL
*/
-void *_talloc_move(const void *new_ctx, const void *_pptr)
+_PUBLIC_ void *_talloc_move(const void *new_ctx, const void *_pptr)
{
const void **pptr = discard_const_p(const void *,_pptr);
void *ret = talloc_steal(new_ctx, discard_const_p(void, *pptr));
/*
return the total size of a talloc pool (subtree)
*/
-size_t talloc_total_size(const void *ptr)
+_PUBLIC_ size_t talloc_total_size(const void *ptr)
{
size_t total = 0;
struct talloc_chunk *c, *tc;
/*
return the total number of blocks in a talloc pool (subtree)
*/
-size_t talloc_total_blocks(const void *ptr)
+_PUBLIC_ size_t talloc_total_blocks(const void *ptr)
{
size_t total = 0;
struct talloc_chunk *c, *tc;
/*
return the number of external references to a pointer
*/
-size_t talloc_reference_count(const void *ptr)
+_PUBLIC_ size_t talloc_reference_count(const void *ptr)
{
struct talloc_chunk *tc = talloc_chunk_from_ptr(ptr);
struct talloc_reference_handle *h;
/*
report on memory usage by all children of a pointer, giving a full tree view
*/
-void talloc_report_depth_cb(const void *ptr, int depth, int max_depth,
+_PUBLIC_ void talloc_report_depth_cb(const void *ptr, int depth, int max_depth,
void (*callback)(const void *ptr,
int depth, int max_depth,
int is_ref,
/*
report on memory usage by all children of a pointer, giving a full tree view
*/
-void talloc_report_depth_file(const void *ptr, int depth, int max_depth, FILE *f)
+_PUBLIC_ void talloc_report_depth_file(const void *ptr, int depth, int max_depth, FILE *f)
{
if (f) {
talloc_report_depth_cb(ptr, depth, max_depth, talloc_report_depth_FILE_helper, f);
/*
report on memory usage by all children of a pointer, giving a full tree view
*/
-void talloc_report_full(const void *ptr, FILE *f)
+_PUBLIC_ void talloc_report_full(const void *ptr, FILE *f)
{
talloc_report_depth_file(ptr, 0, -1, f);
}
/*
report on memory usage by all children of a pointer
*/
-void talloc_report(const void *ptr, FILE *f)
+_PUBLIC_ void talloc_report(const void *ptr, FILE *f)
{
talloc_report_depth_file(ptr, 0, 1, f);
}
/*
enable tracking of the NULL context
*/
-void talloc_enable_null_tracking(void)
+_PUBLIC_ void talloc_enable_null_tracking(void)
{
if (null_context == NULL) {
null_context = _talloc_named_const(NULL, 0, "null_context");
enable tracking of the NULL context, not moving the autofree context
into the NULL context. This is needed for the talloc testsuite
*/
-void talloc_enable_null_tracking_no_autofree(void)
+_PUBLIC_ void talloc_enable_null_tracking_no_autofree(void)
{
if (null_context == NULL) {
null_context = _talloc_named_const(NULL, 0, "null_context");
/*
disable tracking of the NULL context
*/
-void talloc_disable_null_tracking(void)
+_PUBLIC_ void talloc_disable_null_tracking(void)
{
if (null_context != NULL) {
/* we have to move any children onto the real NULL
/*
enable leak reporting on exit
*/
-void talloc_enable_leak_report(void)
+_PUBLIC_ void talloc_enable_leak_report(void)
{
talloc_enable_null_tracking();
atexit(talloc_report_null);
/*
enable full leak reporting on exit
*/
-void talloc_enable_leak_report_full(void)
+_PUBLIC_ void talloc_enable_leak_report_full(void)
{
talloc_enable_null_tracking();
atexit(talloc_report_null_full);
/*
talloc and zero memory.
*/
-void *_talloc_zero(const void *ctx, size_t size, const char *name)
+_PUBLIC_ void *_talloc_zero(const void *ctx, size_t size, const char *name)
{
void *p = _talloc_named_const(ctx, size, name);
/*
memdup with a talloc.
*/
-void *_talloc_memdup(const void *t, const void *p, size_t size, const char *name)
+_PUBLIC_ void *_talloc_memdup(const void *t, const void *p, size_t size, const char *name)
{
void *newp = _talloc_named_const(t, size, name);
/*
strdup with a talloc
*/
-char *talloc_strdup(const void *t, const char *p)
+_PUBLIC_ char *talloc_strdup(const void *t, const char *p)
{
if (unlikely(!p)) return NULL;
return __talloc_strlendup(t, p, strlen(p));
/*
strndup with a talloc
*/
-char *talloc_strndup(const void *t, const char *p, size_t n)
+_PUBLIC_ char *talloc_strndup(const void *t, const char *p, size_t n)
{
if (unlikely(!p)) return NULL;
return __talloc_strlendup(t, p, strnlen(p, n));
/*
* Appends at the end of the string.
*/
-char *talloc_strdup_append(char *s, const char *a)
+_PUBLIC_ char *talloc_strdup_append(char *s, const char *a)
{
if (unlikely(!s)) {
return talloc_strdup(NULL, a);
* Appends at the end of the talloc'ed buffer,
* not the end of the string.
*/
-char *talloc_strdup_append_buffer(char *s, const char *a)
+_PUBLIC_ char *talloc_strdup_append_buffer(char *s, const char *a)
{
size_t slen;
/*
* Appends at the end of the string.
*/
-char *talloc_strndup_append(char *s, const char *a, size_t n)
+_PUBLIC_ char *talloc_strndup_append(char *s, const char *a, size_t n)
{
if (unlikely(!s)) {
return talloc_strdup(NULL, a);
* Appends at the end of the talloc'ed buffer,
* not the end of the string.
*/
-char *talloc_strndup_append_buffer(char *s, const char *a, size_t n)
+_PUBLIC_ char *talloc_strndup_append_buffer(char *s, const char *a, size_t n)
{
size_t slen;
#endif
#endif
-char *talloc_vasprintf(const void *t, const char *fmt, va_list ap)
+_PUBLIC_ char *talloc_vasprintf(const void *t, const char *fmt, va_list ap)
{
int len;
char *ret;
Perform string formatting, and return a pointer to newly allocated
memory holding the result, inside a memory pool.
*/
-char *talloc_asprintf(const void *t, const char *fmt, ...)
+_PUBLIC_ char *talloc_asprintf(const void *t, const char *fmt, ...)
{
va_list ap;
char *ret;
* accumulating output into a string buffer. Appends at the end
* of the string.
**/
-char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap)
+_PUBLIC_ char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap)
{
if (unlikely(!s)) {
return talloc_vasprintf(NULL, fmt, ap);
* and return @p s, which may have moved. Always appends at the
* end of the talloc'ed buffer, not the end of the string.
**/
-char *talloc_vasprintf_append_buffer(char *s, const char *fmt, va_list ap)
+_PUBLIC_ char *talloc_vasprintf_append_buffer(char *s, const char *fmt, va_list ap)
{
size_t slen;
s, which may have moved. Good for gradually accumulating output
into a string buffer.
*/
-char *talloc_asprintf_append(char *s, const char *fmt, ...)
+_PUBLIC_ char *talloc_asprintf_append(char *s, const char *fmt, ...)
{
va_list ap;
s, which may have moved. Good for gradually accumulating output
into a buffer.
*/
-char *talloc_asprintf_append_buffer(char *s, const char *fmt, ...)
+_PUBLIC_ char *talloc_asprintf_append_buffer(char *s, const char *fmt, ...)
{
va_list ap;
/*
alloc an array, checking for integer overflow in the array size
*/
-void *_talloc_array(const void *ctx, size_t el_size, unsigned count, const char *name)
+_PUBLIC_ void *_talloc_array(const void *ctx, size_t el_size, unsigned count, const char *name)
{
if (count >= MAX_TALLOC_SIZE/el_size) {
return NULL;
/*
alloc an zero array, checking for integer overflow in the array size
*/
-void *_talloc_zero_array(const void *ctx, size_t el_size, unsigned count, const char *name)
+_PUBLIC_ void *_talloc_zero_array(const void *ctx, size_t el_size, unsigned count, const char *name)
{
if (count >= MAX_TALLOC_SIZE/el_size) {
return NULL;
/*
realloc an array, checking for integer overflow in the array size
*/
-void *_talloc_realloc_array(const void *ctx, void *ptr, size_t el_size, unsigned count, const char *name)
+_PUBLIC_ void *_talloc_realloc_array(const void *ctx, void *ptr, size_t el_size, unsigned count, const char *name)
{
if (count >= MAX_TALLOC_SIZE/el_size) {
return NULL;
to libraries that want a realloc function (a realloc function encapsulates
all the basic capabilities of an allocation library, which is why this is useful)
*/
-void *talloc_realloc_fn(const void *context, void *ptr, size_t size)
+_PUBLIC_ void *talloc_realloc_fn(const void *context, void *ptr, size_t size)
{
return _talloc_realloc(context, ptr, size, NULL);
}
return a context which will be auto-freed on exit
this is useful for reducing the noise in leak reports
*/
-void *talloc_autofree_context(void)
+_PUBLIC_ void *talloc_autofree_context(void)
{
if (autofree_context == NULL) {
autofree_context = _talloc_named_const(NULL, 0, "autofree_context");
return autofree_context;
}
-size_t talloc_get_size(const void *context)
+_PUBLIC_ size_t talloc_get_size(const void *context)
{
struct talloc_chunk *tc;
/*
find a parent of this context that has the given name, if any
*/
-void *talloc_find_parent_byname(const void *context, const char *name)
+_PUBLIC_ void *talloc_find_parent_byname(const void *context, const char *name)
{
struct talloc_chunk *tc;
/*
show the parentage of a context
*/
-void talloc_show_parents(const void *context, FILE *file)
+_PUBLIC_ void talloc_show_parents(const void *context, FILE *file)
{
struct talloc_chunk *tc;
/*
return 1 if ptr is a parent of context
*/
-int talloc_is_parent(const void *context, const void *ptr)
+static int _talloc_is_parent(const void *context, const void *ptr, int depth)
{
struct talloc_chunk *tc;
}
tc = talloc_chunk_from_ptr(context);
- while (tc) {
+ while (tc && depth > 0) {
if (TC_PTR_FROM_CHUNK(tc) == ptr) return 1;
while (tc && tc->prev) tc = tc->prev;
if (tc) {
tc = tc->parent;
+ depth--;
}
}
return 0;
}
+
+/*
+ return 1 if ptr is a parent of context
+*/
+_PUBLIC_ int talloc_is_parent(const void *context, const void *ptr)
+{
+ return _talloc_is_parent(context, ptr, TALLOC_MAX_DEPTH);
+}
git.samba.org / sfrench / samba-autobuild / .git / blobdiff