src: track memory retainer fields

If retainers are embedded in retainers, direct tracking
those lead to double tracking. Instead, use a special tracker
that adjusts the tracking for the container object.

PR-URL: https://github.com/nodejs/node/pull/26161
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/memory_tracker-inl.h b/src/memory_tracker-inl.h
index 65bcbccdc0..95d623c2b4 100644
--- a/src/memory_tracker-inl.h
+++ b/src/memory_tracker-inl.h
@@ -241,6 +241,13 @@ void MemoryTracker::Track(const MemoryRetainer* retainer,
   PopNode();
 }
 
+void MemoryTracker::TrackInlineField(const MemoryRetainer* retainer,
+                                     const char* edge_name) {
+  Track(retainer, edge_name);
+  CHECK(CurrentNode());
+  CurrentNode()->size_ -= retainer->SelfSize();
+}
+
 MemoryRetainerNode* MemoryTracker::CurrentNode() const {
   if (node_stack_.empty()) return nullptr;
   return node_stack_.top();