util: recover from maximum call stack size

Using util.inspect should still return values in case the maximum
call stack size is reached. This is important to inspect linked
lists and similar.

PR-URL: https://github.com/nodejs/node/pull/20725
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/test/parallel/test-util-inspect.js b/test/parallel/test-util-inspect.js
index 347f5046a8..1f05f4987e 100644
--- a/test/parallel/test-util-inspect.js
+++ b/test/parallel/test-util-inspect.js
@@ -1410,10 +1410,17 @@ util.inspect(process);
   // Test that a long linked list can be inspected without throwing an error.
   const list = {};
   let head = list;
-  // The real cutoff value is closer to 1400 stack frames as of May 2018,
-  // but let's be generous here – even a linked listed of length 100k should be
-  // inspectable in some way.
+  // A linked list of length 100k should be inspectable in some way, even though
+  // the real cutoff value is much lower than 100k.
   for (let i = 0; i < 100000; i++)
     head = head.next = {};
-  util.inspect(list);
+  assert.strictEqual(
+    util.inspect(list),
+    '{ next: { next: { next: [Object] } } }'
+  );
+  const longList = util.inspect(list, { depth: Infinity });
+  const match = longList.match(/next/g);
+  assert(match.length > 1000 && match.length < 10000);
+  assert(longList.includes('[Object: Inspection interrupted ' +
+    'prematurely. Maximum call stack size exceeded.]'));
 }