* Therefore, if \c head->next is \c NULL or \c tail_prev->prev is \c NULL,
* the list is empty.
*
+ * Do note that this means that the list nodes will contain pointers into the
+ * list structure itself and as a result you may not \c realloc() an \c
+ * exec_list or any structure in which an \c exec_list is embedded.
+ *
* To anyone familiar with "exec lists" on the Amiga, this structure should
* be immediately recognizable. See the following link for the original Amiga
* operating system documentation on the subject.
#endif
#include <assert.h>
-#include "ralloc.h"
+#include "util/ralloc.h"
struct exec_node {
struct exec_node *next;
const exec_node *get_tail() const;
exec_node *get_tail();
+ unsigned length() const;
+
void push_head(exec_node *n);
void push_tail(exec_node *n);
void push_degenerate_list_at_head(exec_node *n);
void move_nodes_to(exec_list *target);
/**
- * Append all nodes from the source list to the target list
+ * Append all nodes from the source list to the end of the target list
*/
void append_list(exec_list *source);
+
+ /**
+ * Prepend all nodes from the source list to the beginning of the target
+ * list
+ */
+ void prepend_list(exec_list *source);
#endif
};
return !exec_list_is_empty(list) ? list->tail_pred : NULL;
}
+static inline unsigned
+exec_list_length(const struct exec_list *list)
+{
+ unsigned size = 0;
+ struct exec_node *node;
+
+ for (node = list->head; node->next != NULL; node = node->next) {
+ size++;
+ }
+
+ return size;
+}
+
static inline void
exec_list_push_head(struct exec_list *list, struct exec_node *n)
{
exec_list_make_empty(source);
}
+static inline void
+exec_list_prepend(struct exec_list *list, struct exec_list *source)
+{
+ exec_list_append(source, list);
+ exec_list_move_nodes_to(source, list);
+}
+
static inline void
exec_node_insert_list_before(struct exec_node *n, struct exec_list *before)
{
exec_list_make_empty(before);
}
+static inline void
+exec_list_validate(const struct exec_list *list)
+{
+ const struct exec_node *node;
+
+ assert(list->head->prev == (const struct exec_node *) &list->head);
+ assert(list->tail == NULL);
+ assert(list->tail_pred->next == (const struct exec_node *) &list->tail);
+
+ /* We could try to use one of the interators below for this but they all
+ * either require C++ or assume the exec_node is embedded in a structure
+ * which is not the case for this function.
+ */
+ for (node = list->head; node->next != NULL; node = node->next) {
+ assert(node->next->prev == node);
+ assert(node->prev->next == node);
+ }
+}
+
#ifdef __cplusplus
inline void exec_list::make_empty()
{
return exec_list_get_tail(this);
}
+inline unsigned exec_list::length() const
+{
+ return exec_list_length(this);
+}
+
inline void exec_list::push_head(exec_node *n)
{
exec_list_push_head(this, n);
exec_list_append(this, source);
}
+inline void exec_list::prepend_list(exec_list *source)
+{
+ exec_list_prepend(this, source);
+}
+
inline void exec_node::insert_before(exec_list *before)
{
exec_node_insert_list_before(this, before);
}
#endif
-/**
- * This version is safe even if the current node is removed.
- */
-#define foreach_list_safe(__node, __list) \
- for (struct exec_node * __node = (__list)->head, * __next = __node->next \
- ; __next != NULL \
- ; __node = __next, __next = __next->next)
-
-#define foreach_list(__node, __list) \
- for (struct exec_node * __node = (__list)->head \
- ; (__node)->next != NULL \
- ; (__node) = (__node)->next)
-
#define foreach_in_list(__type, __inst, __list) \
for (__type *(__inst) = (__type *)(__list)->head; \
!(__inst)->is_tail_sentinel(); \
(__inst) = (__type *)(__inst)->next)
-#define foreach_in_list_reverse(__type, __inst, __list) \
- for (__type *(__inst) = (__type *)(__list)->head; \
- !(__inst)->is_head_sentinel(); \
+#define foreach_in_list_reverse(__type, __inst, __list) \
+ for (__type *(__inst) = (__type *)(__list)->tail_pred; \
+ !(__inst)->is_head_sentinel(); \
(__inst) = (__type *)(__inst)->prev)
/**
__next != NULL; \
__node = __next, __next = (__type *)__next->next)
+#define foreach_in_list_reverse_safe(__type, __node, __list) \
+ for (__type *__node = (__type *)(__list)->tail_pred, \
+ *__prev = (__type *)__node->prev; \
+ __prev != NULL; \
+ __node = __prev, __prev = (__type *)__prev->prev)
+
+#define foreach_in_list_use_after(__type, __inst, __list) \
+ __type *(__inst); \
+ for ((__inst) = (__type *)(__list)->head; \
+ !(__inst)->is_tail_sentinel(); \
+ (__inst) = (__type *)(__inst)->next)
/**
* Iterate through two lists at once. Stops at the end of the shorter list.
*
__next1 = __next1->next, \
__next2 = __next2->next)
-#define foreach_list_const(__node, __list) \
- for (const struct exec_node * __node = (__list)->head \
- ; (__node)->next != NULL \
- ; (__node) = (__node)->next)
-
#define foreach_list_typed(__type, __node, __field, __list) \
for (__type * __node = \
exec_node_data(__type, (__list)->head, __field); \
(__node)->__field.next != NULL; \
(__node) = exec_node_data(__type, (__node)->__field.next, __field))
-#define foreach_list_typed_const(__type, __node, __field, __list) \
- for (const __type * __node = \
- exec_node_data(__type, (__list)->head, __field); \
- (__node)->__field.next != NULL; \
- (__node) = exec_node_data(__type, (__node)->__field.next, __field))
+#define foreach_list_typed_reverse(__type, __node, __field, __list) \
+ for (__type * __node = \
+ exec_node_data(__type, (__list)->tail_pred, __field); \
+ (__node)->__field.prev != NULL; \
+ (__node) = exec_node_data(__type, (__node)->__field.prev, __field))
+
+#define foreach_list_typed_safe(__type, __node, __field, __list) \
+ for (__type * __node = \
+ exec_node_data(__type, (__list)->head, __field), \
+ * __next = \
+ exec_node_data(__type, (__node)->__field.next, __field); \
+ (__node)->__field.next != NULL; \
+ __node = __next, __next = \
+ exec_node_data(__type, (__next)->__field.next, __field))
+
+#define foreach_list_typed_reverse_safe(__type, __node, __field, __list) \
+ for (__type * __node = \
+ exec_node_data(__type, (__list)->tail_pred, __field), \
+ * __prev = \
+ exec_node_data(__type, (__node)->__field.prev, __field); \
+ (__node)->__field.prev != NULL; \
+ __node = __prev, __prev = \
+ exec_node_data(__type, (__prev)->__field.prev, __field))
#endif /* LIST_CONTAINER_H */