* 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, "")))
/**
* @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.
* 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)))
#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.
*/
#define tal_dup(ctx, type, p, n, extra) \
((type *)tal_dup_((ctx), tal_typechk_(p, type *), \
- tal_sizeof_(sizeof(type), (n)), \
- tal_sizeof_(sizeof(type), (extra)), \
- TAL_LABEL(type, "[]")))
-
-/**
- * tal_strdup - duplicate a string
- * @ctx: NULL, or tal allocated object to be parent.
- * @p: the string to copy (can be take()).
- */
-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.
- * @p: the string to copy (can be take()).
- * @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.
- * @fmt: the printf-style format (can be take()).
- */
-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.
- * @fmt: the printf-style format (can be take()).
- * @va: the va_list containing the format args.
- */
-char *tal_vasprintf(const tal_t *ctx, const char *fmt, va_list ap)
- PRINTF_FMT(2,0);
+ 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_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
#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 n, size_t extra,
+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_del_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 */