+
+/* Hash a cgraph node set element. */
+
+static hashval_t
+hash_cgraph_node_set_element (const void *p)
+{
+ const_cgraph_node_set_element element = (const_cgraph_node_set_element) p;
+ return htab_hash_pointer (element->node);
+}
+
+/* Compare two cgraph node set elements. */
+
+static int
+eq_cgraph_node_set_element (const void *p1, const void *p2)
+{
+ const_cgraph_node_set_element e1 = (const_cgraph_node_set_element) p1;
+ const_cgraph_node_set_element e2 = (const_cgraph_node_set_element) p2;
+
+ return e1->node == e2->node;
+}
+
+/* Create a new cgraph node set. */
+
+cgraph_node_set
+cgraph_node_set_new (void)
+{
+ cgraph_node_set new_node_set;
+
+ new_node_set = GGC_NEW (struct cgraph_node_set_def);
+ new_node_set->hashtab = htab_create_ggc (10,
+ hash_cgraph_node_set_element,
+ eq_cgraph_node_set_element,
+ NULL);
+ new_node_set->nodes = NULL;
+ return new_node_set;
+}
+
+/* Add cgraph_node NODE to cgraph_node_set SET. */
+
+void
+cgraph_node_set_add (cgraph_node_set set, struct cgraph_node *node)
+{
+ void **slot;
+ cgraph_node_set_element element;
+ struct cgraph_node_set_element_def dummy;
+
+ dummy.node = node;
+ slot = htab_find_slot (set->hashtab, &dummy, INSERT);
+
+ if (*slot != HTAB_EMPTY_ENTRY)
+ {
+ element = (cgraph_node_set_element) *slot;
+ gcc_assert (node == element->node
+ && (VEC_index (cgraph_node_ptr, set->nodes, element->index)
+ == node));
+ return;
+ }
+
+ /* Insert node into hash table. */
+ element =
+ (cgraph_node_set_element) GGC_NEW (struct cgraph_node_set_element_def);
+ element->node = node;
+ element->index = VEC_length (cgraph_node_ptr, set->nodes);
+ *slot = element;
+
+ /* Insert into node vector. */
+ VEC_safe_push (cgraph_node_ptr, gc, set->nodes, node);
+}
+
+/* Remove cgraph_node NODE from cgraph_node_set SET. */
+
+void
+cgraph_node_set_remove (cgraph_node_set set, struct cgraph_node *node)
+{
+ void **slot, **last_slot;
+ cgraph_node_set_element element, last_element;
+ struct cgraph_node *last_node;
+ struct cgraph_node_set_element_def dummy;
+
+ dummy.node = node;
+ slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
+ if (slot == NULL)
+ return;
+
+ element = (cgraph_node_set_element) *slot;
+ gcc_assert (VEC_index (cgraph_node_ptr, set->nodes, element->index)
+ == node);
+
+ /* Remove from vector. We do this by swapping node with the last element
+ of the vector. */
+ last_node = VEC_pop (cgraph_node_ptr, set->nodes);
+ if (last_node != node)
+ {
+ dummy.node = last_node;
+ last_slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
+ last_element = (cgraph_node_set_element) *last_slot;
+ gcc_assert (last_element);
+
+ /* Move the last element to the original spot of NODE. */
+ last_element->index = element->index;
+ VEC_replace (cgraph_node_ptr, set->nodes, last_element->index,
+ last_node);
+ }
+
+ /* Remove element from hash table. */
+ htab_clear_slot (set->hashtab, slot);
+ ggc_free (element);
+}
+
+/* Find NODE in SET and return an iterator to it if found. A null iterator
+ is returned if NODE is not in SET. */
+
+cgraph_node_set_iterator
+cgraph_node_set_find (cgraph_node_set set, struct cgraph_node *node)
+{
+ void **slot;
+ struct cgraph_node_set_element_def dummy;
+ cgraph_node_set_element element;
+ cgraph_node_set_iterator csi;
+
+ dummy.node = node;
+ slot = htab_find_slot (set->hashtab, &dummy, NO_INSERT);
+ if (slot == NULL)
+ csi.index = (unsigned) ~0;
+ else
+ {
+ element = (cgraph_node_set_element) *slot;
+ gcc_assert (VEC_index (cgraph_node_ptr, set->nodes, element->index)
+ == node);
+ csi.index = element->index;
+ }
+ csi.set = set;
+
+ return csi;
+}
+
+/* Dump content of SET to file F. */
+
+void
+dump_cgraph_node_set (FILE *f, cgraph_node_set set)
+{
+ cgraph_node_set_iterator iter;
+
+ for (iter = csi_start (set); !csi_end_p (iter); csi_next (&iter))
+ {
+ struct cgraph_node *node = csi_node (iter);
+ dump_cgraph_node (f, node);
+ }
+}
+
+/* Dump content of SET to stderr. */
+
+void
+debug_cgraph_node_set (cgraph_node_set set)
+{
+ dump_cgraph_node_set (stderr, set);
+}
+
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