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-rw-r--r--src/glsl/list.h141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/glsl/list.h b/src/glsl/list.h
index ce7f81f4d23..a1200ac3542 100644
--- a/src/glsl/list.h
+++ b/src/glsl/list.h
@@ -360,6 +360,147 @@ struct exec_list {
#endif
};
+static inline void
+exec_list_make_empty(struct exec_list *list)
+{
+ list->head = (struct exec_node *) & list->tail;
+ list->tail = NULL;
+ list->tail_pred = (struct exec_node *) & list->head;
+}
+
+static inline bool
+exec_list_is_empty(const struct exec_list *list)
+{
+ /* There are three ways to test whether a list is empty or not.
+ *
+ * - Check to see if the \c head points to the \c tail.
+ * - Check to see if the \c tail_pred points to the \c head.
+ * - Check to see if the \c head is the sentinel node by test whether its
+ * \c next pointer is \c NULL.
+ *
+ * The first two methods tend to generate better code on modern systems
+ * because they save a pointer dereference.
+ */
+ return list->head == (struct exec_node *) &list->tail;
+}
+
+static inline const struct exec_node *
+exec_list_get_head_const(const struct exec_list *list)
+{
+ return !exec_list_is_empty(list) ? list->head : NULL;
+}
+
+static inline struct exec_node *
+exec_list_get_head(struct exec_list *list)
+{
+ return !exec_list_is_empty(list) ? list->head : NULL;
+}
+
+static inline const struct exec_node *
+exec_list_get_tail_const(const struct exec_list *list)
+{
+ return !exec_list_is_empty(list) ? list->tail_pred : NULL;
+}
+
+static inline struct exec_node *
+exec_list_get_tail(struct exec_list *list)
+{
+ return !exec_list_is_empty(list) ? list->tail_pred : NULL;
+}
+
+static inline void
+exec_list_push_head(struct exec_list *list, struct exec_node *n)
+{
+ n->next = list->head;
+ n->prev = (struct exec_node *) &list->head;
+
+ n->next->prev = n;
+ list->head = n;
+}
+
+static inline void
+exec_list_push_tail(struct exec_list *list, struct exec_node *n)
+{
+ n->next = (struct exec_node *) &list->tail;
+ n->prev = list->tail_pred;
+
+ n->prev->next = n;
+ list->tail_pred = n;
+}
+
+static inline void
+exec_list_push_degenerate_list_at_head(struct exec_list *list, struct exec_node *n)
+{
+ assert(n->prev->next == n);
+
+ n->prev->next = list->head;
+ list->head->prev = n->prev;
+ n->prev = (struct exec_node *) &list->head;
+ list->head = n;
+}
+
+static inline struct exec_node *
+exec_list_pop_head(struct exec_list *list)
+{
+ struct exec_node *const n = exec_list_get_head(list);
+ if (n != NULL)
+ exec_node_remove(n);
+
+ return n;
+}
+
+static inline void
+exec_list_move_nodes_to(struct exec_list *list, struct exec_list *target)
+{
+ if (exec_list_is_empty(list)) {
+ exec_list_make_empty(target);
+ } else {
+ target->head = list->head;
+ target->tail = NULL;
+ target->tail_pred = list->tail_pred;
+
+ target->head->prev = (struct exec_node *) &target->head;
+ target->tail_pred->next = (struct exec_node *) &target->tail;
+
+ exec_list_make_empty(list);
+ }
+}
+
+static inline void
+exec_list_append(struct exec_list *list, struct exec_list *source)
+{
+ if (exec_list_is_empty(source))
+ return;
+
+ /* Link the first node of the source with the last node of the target list.
+ */
+ list->tail_pred->next = source->head;
+ source->head->prev = list->tail_pred;
+
+ /* Make the tail of the source list be the tail of the target list.
+ */
+ list->tail_pred = source->tail_pred;
+ list->tail_pred->next = (struct exec_node *) &list->tail;
+
+ /* Make the source list empty for good measure.
+ */
+ exec_list_make_empty(source);
+}
+
+static inline void
+exec_node_insert_list_before(struct exec_node *n, struct exec_list *before)
+{
+ if (exec_list_is_empty(before))
+ return;
+
+ before->tail_pred->next = n;
+ before->head->prev = n->prev;
+
+ n->prev->next = before->head;
+ n->prev = before->tail_pred;
+
+ exec_list_make_empty(before);
+}
#ifdef __cplusplus
inline void exec_list::make_empty()