*/
typedef void tal_t;
-/**
- * TAL_TAKE - fake tal_t to indicate function will own arguments.
- *
- * Various functions take a context on which to allocate: if you use
- * TAL_TAKE there instead, it means that the argument(s) are actually
- * tal objects. The returned value will share the same parent; it may
- * even be the same pointer as the arguments. The arguments themselves
- * will be reused, freed, or made a child of the return value: they are
- * no longer valid for external use.
- */
-#define TAL_TAKE ((tal_t *)-2L)
-
/**
* tal - basic allocator function
* @ctx: NULL, or tal allocated object to be parent.
* int *p = tal(NULL, int);
* *p = 1;
*/
-#define tal(ctx, type) \
+#define tal(ctx, type) \
((type *)tal_alloc_((ctx), sizeof(type), false, TAL_LABEL(type, "")))
/**
* p = talz(NULL, int);
* assert(*p == 0);
*/
-#define talz(ctx, type) \
+#define talz(ctx, type) \
((type *)tal_alloc_((ctx), sizeof(type), true, TAL_LABEL(type, "")))
/**
* @p: NULL, or tal allocated object to free.
*
* This calls the destructors for p (if any), then does the same for all its
- * children (recursively) before finally freeing the memory.
+ * children (recursively) before finally freeing the memory. It returns
+ * NULL, for convenience.
*
* Note: errno is preserved by this call.
*
* Example:
- * tal_free(p);
+ * p = tal_free(p);
*/
-void tal_free(const tal_t *p);
+void *tal_free(const tal_t *p);
/**
* tal_arr - allocate an array of objects.
* @type: the type to allocate.
* @count: the number to allocate.
*
+ * Note that an object allocated with tal_arr() has a length property;
+ * see tal_count().
+ *
* Example:
* p = tal_arr(NULL, int, 2);
* p[0] = 0;
* p[1] = 1;
*/
-#define tal_arr(ctx, type, count) \
- ((type *)tal_alloc_((ctx), tal_sizeof_(sizeof(type), (count)), false, \
- TAL_LABEL(type, "[]")))
+#define tal_arr(ctx, type, count) \
+ ((type *)tal_alloc_arr_((ctx), sizeof(type), (count), false, \
+ true, TAL_LABEL(type, "[]")))
/**
* tal_arrz - allocate an array of zeroed objects.
* @type: the type to allocate.
* @count: the number to allocate.
*
+ * Note that an object allocated with tal_arrz() has a length property;
+ * see tal_count().
+ *
* Example:
* p = tal_arrz(NULL, int, 2);
* assert(p[0] == 0 && p[1] == 0);
*/
#define tal_arrz(ctx, type, count) \
- ((type *)tal_alloc_((ctx), tal_sizeof_(sizeof(type), (count)), true, \
- TAL_LABEL(type, "[]")))
+ ((type *)tal_alloc_arr_((ctx), sizeof(type), (count), true, \
+ true, TAL_LABEL(type, "[]")))
/**
* tal_resize - enlarge or reduce a tal_arr[z].
* @count: the number to allocate.
*
* This returns true on success (and may move *@p), or false on failure.
+ * If @p has a length property, it is updated on success.
*
* Example:
* tal_resize(&p, 100);
*/
#define tal_resize(p, count) \
- tal_resize_((void **)(p), tal_sizeof_(sizeof**(p), (count)))
+ tal_resize_((void **)(p), sizeof**(p), (count))
/**
* tal_steal - change the parent of a tal-allocated pointer.
*
* This may need to perform an allocation, in which case it may fail; thus
* it can return NULL, otherwise returns @ptr.
- *
- * Note: weird macro avoids gcc's 'warning: value computed is not used'.
*/
#if HAVE_STATEMENT_EXPR
+/* Weird macro avoids gcc's 'warning: value computed is not used'. */
#define tal_steal(ctx, ptr) \
({ (tal_typeof(ptr) tal_steal_((ctx),(ptr))); })
#else
* tal_add_destructor - add a callback function when this context is destroyed.
* @ptr: The tal allocated object.
* @function: the function to call before it's freed.
+ *
+ * This is a more convenient form of tal_add_notifier(@ptr,
+ * TAL_NOTIFY_FREE, ...), in that the function prototype takes only @ptr.
+ *
+ * Note that this can only fail if your allocfn fails and your errorfn returns.
*/
#define tal_add_destructor(ptr, function) \
tal_add_destructor_((ptr), typesafe_cb(void, void *, (function), (ptr)))
+/**
+ * tal_del_destructor - remove a destructor callback function.
+ * @ptr: The tal allocated object.
+ * @function: the function to call before it's freed.
+ *
+ * If @function has not been successfully added as a destructor, this returns
+ * false.
+ */
+#define tal_del_destructor(ptr, function) \
+ tal_del_destructor_((ptr), typesafe_cb(void, void *, (function), (ptr)))
+
+enum tal_notify_type {
+ TAL_NOTIFY_FREE = 1,
+ TAL_NOTIFY_STEAL = 2,
+ TAL_NOTIFY_MOVE = 4,
+ TAL_NOTIFY_RESIZE = 8,
+ TAL_NOTIFY_RENAME = 16,
+ TAL_NOTIFY_ADD_CHILD = 32,
+ TAL_NOTIFY_DEL_CHILD = 64,
+ TAL_NOTIFY_ADD_NOTIFIER = 128,
+ TAL_NOTIFY_DEL_NOTIFIER = 256
+};
+
+/**
+ * tal_add_notifier - add a callback function when this context changes.
+ * @ptr: The tal allocated object.
+ * @types: Bitwise OR of the types the callback is interested in.
+ * @callback: the function to call.
+ *
+ * Note that this can only fail if your allocfn fails and your errorfn
+ * returns. Also note that notifiers are not reliable in the case
+ * where an allocation fails, as they may be called before any
+ * allocation is actually done.
+ *
+ * TAL_NOTIFY_FREE is called when @ptr is freed, either directly or
+ * because an ancestor is freed: @info is the argument to tal_free().
+ * It is exactly equivalent to a destructor, with more information.
+ *
+ * TAL_NOTIFY_STEAL is called when @ptr's parent changes: @info is the
+ * new parent.
+ *
+ * TAL_NOTIFY_MOVE is called when @ptr is realloced (via tal_resize)
+ * and moved. In this case, @ptr arg here is the new memory, and
+ * @info is the old pointer.
+ *
+ * TAL_NOTIFY_RESIZE is called when @ptr is realloced via tal_resize:
+ * @info is the new size, in bytes. If the pointer has moved,
+ * TAL_NOTIFY_MOVE callbacks are called first.
+ *
+ * TAL_NOTIFY_ADD_CHILD/TAL_NOTIFY_DEL_CHILD are called when @ptr is
+ * the context for a tal() allocating call, or a direct child is
+ * tal_free()d: @info is the child. Note that TAL_NOTIFY_DEL_CHILD is
+ * not called when this context is tal_free()d: TAL_NOTIFY_FREE is
+ * considered sufficient for that case.
+ *
+ * TAL_NOTIFY_ADD_NOTIFIER/TAL_NOTIFIER_DEL_NOTIFIER are called when a
+ * notifier is added or removed (not for this notifier): @info is the
+ * callback. This is also called for tal_add_destructor and
+ * tal_del_destructor.
+ */
+#define tal_add_notifier(ptr, types, callback) \
+ tal_add_notifier_((ptr), (types), \
+ typesafe_cb_postargs(void, tal_t *, (callback), \
+ (ptr), \
+ enum tal_notify_type, void *))
+
+/**
+ * tal_del_notifier - remove a notifier callback function.
+ * @ptr: The tal allocated object.
+ * @callback: the function to call.
+ */
+#define tal_del_notifier(ptr, callback) \
+ tal_del_notifier_((ptr), \
+ typesafe_cb_postargs(void, void *, (callback), \
+ (ptr), \
+ enum tal_notify_type, void *))
+
/**
* tal_set_name - attach a name to a tal pointer.
* @ptr: The tal allocated object.
*/
const char *tal_name(const tal_t *ptr);
+/**
+ * tal_count - get the count of objects in a tal_arr.
+ * @ptr: The tal allocated object array.
+ *
+ * Returns 0 if @ptr has no length property, but we aware that that is
+ * also a valid size!
+ */
+size_t tal_count(const tal_t *ptr);
+
/**
* tal_first - get the first tal object child.
* @root: The tal allocated object to start with, or NULL.
tal_t *tal_parent(const tal_t *ctx);
/**
- * tal_memdup - duplicate memory.
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @p: the memory to copy
- * @n: the number of bytes.
- *
- */
-void *tal_memdup(const tal_t *ctx, const void *p, size_t n);
-
-/**
- * tal_strdup - duplicate a string
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @p: the string to copy
+ * tal_dup - duplicate an array.
+ * @ctx: The tal allocated object to be parent of the result (may be NULL).
+ * @type: the type (should match type of @p!)
+ * @p: the array to copy (or resized & reparented if take())
+ * @n: the number of sizeof(type) entries to copy.
+ * @extra: the number of extra sizeof(type) entries to allocate.
*/
-char *tal_strdup(const tal_t *ctx, const char *p);
-
-/**
- * tal_strndup - duplicate a limited amount of a string.
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @p: the string to copy
- * @n: the maximum length to copy.
- *
- * Always gives a nul-terminated string, with strlen() <= @n.
- */
-char *tal_strndup(const tal_t *ctx, const char *p, size_t n);
-
-/**
- * tal_asprintf - allocate a formatted string
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @fmt: the printf-style format.
- *
- * If @ctx is TAL_TAKE, @fmt is freed and its parent will be the parent
- * of the return value.
- */
-char *tal_asprintf(const tal_t *ctx, const char *fmt, ...) PRINTF_FMT(2,3);
-
-/**
- * tal_vasprintf - allocate a formatted string (va_list version)
- * @ctx: NULL, or tal allocated object to be parent (or TAL_TAKE).
- * @fmt: the printf-style format.
- * @va: the va_list containing the format args.
- *
- * If @ctx is TAL_TAKE, @fmt is freed and its parent will be the parent
- * of the return value.
- */
-char *tal_vasprintf(const tal_t *ctx, const char *fmt, va_list ap)
- PRINTF_FMT(2,0);
+#define tal_dup(ctx, type, p, n, extra) \
+ ((type *)tal_dup_((ctx), tal_typechk_(p, type *), \
+ sizeof(type), (n), (extra), \
+ true, TAL_LABEL(type, "[]")))
/**
void (*free_fn)(void *),
void (*error_fn)(const char *msg));
+/**
+ * tal_expand - expand a tal array with contents.
+ * @a1p: a pointer to the tal array to expand.
+ * @a2: the second array (can be take()).
+ * @num2: the number of elements in the second array.
+ *
+ * Note that *@a1 and @a2 should be the same type. tal_count(@a1) will
+ * be increased by @num2.
+ *
+ * Example:
+ * int *arr1 = tal_arrz(NULL, int, 2);
+ * int arr2[2] = { 1, 3 };
+ *
+ * tal_expand(&arr1, arr2, 2);
+ * assert(tal_count(arr1) == 4);
+ * assert(arr1[2] == 1);
+ * assert(arr1[3] == 3);
+ */
+#define tal_expand(a1p, a2, num2) \
+ tal_expand_((void **)(a1p), (a2), sizeof**(a1p), \
+ (num2) + 0*sizeof(*(a1p) == (a2)))
+
+/**
+ * tal_cleanup - remove pointers from NULL node
+ *
+ * Internally, tal keeps a list of nodes allocated from @ctx NULL; this
+ * prevents valgrind from noticing memory leaks. This re-initializes
+ * that list to empty.
+ *
+ * It also calls take_cleanup() for you.
+ */
+void tal_cleanup(void);
+
/**
* tal_check - set the allocation or error functions to use
bool tal_set_name_(tal_t *ctx, const char *name, bool literal);
-static inline size_t tal_sizeof_(size_t size, size_t count)
-{
- /* Multiplication wrap */
- if (count && unlikely(size * count / size != count))
- return (size_t)-1024;
-
- size *= count;
-
- /* Make sure we don't wrap adding header. */
- if (size > (size_t)-1024)
- return (size_t)-1024;
-
- return size;
-}
-
#if HAVE_TYPEOF
#define tal_typeof(ptr) (__typeof__(ptr))
+#if HAVE_STATEMENT_EXPR
+/* Careful: ptr can be const foo *, ptype is foo *. Also, ptr could
+ * be an array, eg "hello". */
+#define tal_typechk_(ptr, ptype) ({ __typeof__((ptr)+0) _p = (ptype)(ptr); _p; })
#else
+#define tal_typechk_(ptr, ptype) (ptr)
+#endif
+#else /* !HAVE_TYPEOF */
#define tal_typeof(ptr)
+#define tal_typechk_(ptr, ptype) (ptr)
#endif
void *tal_alloc_(const tal_t *ctx, size_t bytes, bool clear, const char *label);
+void *tal_alloc_arr_(const tal_t *ctx, size_t bytes, size_t count, bool clear,
+ bool add_count, const char *label);
+
+void *tal_dup_(const tal_t *ctx, const void *p, size_t size,
+ size_t n, size_t extra, bool add_count,
+ const char *label);
tal_t *tal_steal_(const tal_t *new_parent, const tal_t *t);
-bool tal_resize_(tal_t **ctxp, size_t size);
+bool tal_resize_(tal_t **ctxp, size_t size, size_t count);
+bool tal_expand_(tal_t **ctxp, const void *src, size_t size, size_t count);
-bool tal_add_destructor_(tal_t *ctx, void (*destroy)(void *me));
+bool tal_add_destructor_(const tal_t *ctx, void (*destroy)(void *me));
+bool tal_del_destructor_(const tal_t *ctx, void (*destroy)(void *me));
+bool tal_add_notifier_(const tal_t *ctx, enum tal_notify_type types,
+ void (*notify)(tal_t *ctx, enum tal_notify_type,
+ void *info));
+bool tal_del_notifier_(const tal_t *ctx,
+ void (*notify)(tal_t *ctx, enum tal_notify_type,
+ void *info));
#endif /* CCAN_TAL_H */
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