print trace for potential cycle, #124723 (comment)

microsoft · May 31, 2021 · 692fb8a · 692fb8a
1 parent 8b04a82
commit 692fb8a
Showing 1 changed file with 8 additions and 4 deletions.
diff --git a/src/vs/base/common/map.ts b/src/vs/base/common/map.ts
@@ -497,21 +497,25 @@ export class TernarySearchTree<K, V> {
 		yield* this._entries(this._root);
 	}
 
-	private *_entries(node: TernarySearchTreeNode<K, V> | undefined): IterableIterator<[K, V]> {
+	private *_entries(node: TernarySearchTreeNode<K, V> | undefined, i: number = 0): IterableIterator<[K, V]> {
+		if (i > 5000) {
+			console.trace('potential CYCLE detected');
+			return;
+		}
 		if (node) {
 			// left
-			yield* this._entries(node.left);
+			yield* this._entries(node.left, i++);
 
 			// node
 			if (node.value) {
 				// callback(node.value, this._iter.join(parts));
 				yield [node.key, node.value];
 			}
 			// mid
-			yield* this._entries(node.mid);
+			yield* this._entries(node.mid, i++);
 
 			// right
-			yield* this._entries(node.right);
+			yield* this._entries(node.right, i++);
 		}
 	}
 }