1 files changed, 36 insertions, 0 deletions
diff --git a/deps/v8/src/heap/cppgc-js/cross-heap-remembered-set.cc b/deps/v8/src/heap/cppgc-js/cross-heap-remembered-set.cc
new file mode 100644
index 0000000000..5c70fdeb22
--- /dev/null
+++ b/deps/v8/src/heap/cppgc-js/cross-heap-remembered-set.cc
@@ -0,0 +1,36 @@
+// Copyright 2022 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/heap/cppgc-js/cross-heap-remembered-set.h"
+
+#include "src/api/api-inl.h"
+#include "src/handles/global-handles-inl.h"
+#include "src/heap/cppgc/heap-page.h"
+
+namespace v8::internal {
+
+void CrossHeapRememberedSet::RememberReferenceIfNeeded(Isolate& isolate,
+                                                       JSObject host_obj,
+                                                       void* cppgc_object) {
+  DCHECK_NOT_NULL(cppgc_object);
+  // Any in-cage pointer must point to a vaild, not freed cppgc object.
+  auto* page =
+      cppgc::internal::BasePage::FromInnerAddress(&heap_base_, cppgc_object);
+  // TODO(v8:13475): Better filter with on-cage check.
+  if (!page) return;
+  auto& value_hoh = page->ObjectHeaderFromInnerAddress(cppgc_object);
+  if (!value_hoh.IsYoung()) return;
+  remembered_v8_to_cppgc_references_.push_back(
+      isolate.global_handles()->Create(host_obj));
+}
+
+void CrossHeapRememberedSet::Reset(Isolate& isolate) {
+  for (auto& h : remembered_v8_to_cppgc_references_) {
+    isolate.global_handles()->Destroy(h.location());
+  }
+  remembered_v8_to_cppgc_references_.clear();
+  remembered_v8_to_cppgc_references_.shrink_to_fit();
+}
+
+}  // namespace v8::internal