+
+void nit_abort(const char* s, const char* msg, const char* loc, int line) {
+ PRINT_ERROR( "Runtime error: ");
+ PRINT_ERROR( s, msg);
+ PRINT_ERROR( " (%s", loc);
+ if (line != 0) PRINT_ERROR( ":%d", line);
+ PRINT_ERROR( ")\n");
+ nit_exit(1);
+}
+
+/* Register reference to Nit object with the latest extern method called. */
+void nitni_local_ref_add( struct nitni_ref *ref ) {
+ struct nitni_ref_array_link **link_p;
+ struct nitni_ref_array_link * link = NULL;
+
+ /* find usable link or link to create */
+ link_p = &( stack_frame_head->nitni_local_ref_head );
+ while ( (*link_p) != NULL &&
+ (*link_p)->count >= NITNI_REF_ARRAY_LINK_SIZE ) {
+ link_p = &((*link_p)->next);
+ }
+
+ /* create link if needed */
+ if ( *link_p == NULL ) {
+ link = malloc( sizeof(struct nitni_ref_array_link) );
+ link->count = 0;
+ link->next = NULL;
+
+ (*link_p) = link;
+ } else {
+ link = *link_p;
+ }
+
+ /* add to link */
+ link->reg[ link->count ] = ref;
+ link->count ++;
+}
+
+/* Clean all references associated to the current (but returning) extern method. */
+void nitni_local_ref_clean( void ) {
+ struct nitni_ref_array_link * link,
+ * last_link;
+ int i;
+
+ link = stack_frame_head->nitni_local_ref_head;
+ while ( link != NULL )
+ {
+ for ( i = 0; i < link->count; i ++ ) {
+ if ( link->reg[i]->count == 0 ) { /* not registered globally */
+ free( link->reg[ i ] );
+ }
+ }
+
+ last_link = link;
+ if ( link->count == NITNI_REF_ARRAY_LINK_SIZE )
+ link = link->next;
+ else
+ link = NULL;
+
+ free(last_link);
+ }
+
+ stack_frame_head->nitni_local_ref_head = NULL;
+}
+
+struct nitni_global_ref_list_t *nitni_global_ref_list;
+void nitni_global_ref_list_init() {
+ nitni_global_ref_list = (struct nitni_global_ref_list_t*)malloc(sizeof(struct nitni_global_ref_list_t));
+ nitni_global_ref_list->head = NULL;
+ nitni_global_ref_list->tail = NULL;
+}
+
+void nitni_global_ref_add( struct nitni_ref *ref ) {
+ if ( nitni_global_ref_list->head == NULL ) {
+ nitni_global_ref_list->head = ref;
+ ref->prev = NULL;
+ } else {
+ nitni_global_ref_list->tail->next = ref;
+ ref->prev = nitni_global_ref_list->tail;
+ }
+ nitni_global_ref_list->tail = ref;
+
+ ref->next = NULL;
+}
+
+void nitni_global_ref_remove( struct nitni_ref *ref ) {
+ if ( ref->prev == NULL ) {
+ nitni_global_ref_list->head = ref->next;
+ } else {
+ ref->prev->next = ref->next;
+ }
+
+ if ( ref->next == NULL ) {
+ nitni_global_ref_list->tail = ref->prev;
+ } else {
+ ref->next->prev = ref->prev;
+ }
+}
+
+extern void nitni_global_ref_incr( struct nitni_ref *ref ) {
+ if ( ref->count == 0 ) /* not registered */
+ {
+ /* add to list */
+ nitni_global_ref_add( ref );
+ }
+
+ ref->count ++;
+}
+
+extern void nitni_global_ref_decr( struct nitni_ref *ref ) {
+ if ( ref->count == 1 ) /* was last reference */
+ {
+ /* remove from list */
+ nitni_global_ref_remove( ref );
+ }
+
+ ref->count --;
+}