diff a/src/hotspot/share/gc/shenandoah/shenandoahStackChunkGCData.inline.hpp b/src/hotspot/share/gc/shenandoah/shenandoahStackChunkGCData.inline.hpp
--- /dev/null
+++ b/src/hotspot/share/gc/shenandoah/shenandoahStackChunkGCData.inline.hpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHSTACKCHUNKGCDATA_INLINE_HPP
+#define SHARE_GC_SHENANDOAH_SHENANDOAHSTACKCHUNKGCDATA_INLINE_HPP
+
+#include "gc/shenandoah/shenandoahStackChunkGCData.hpp"
+
+#include "oops/instanceStackChunkKlass.inline.hpp"
+#include "oops/stackChunkOop.inline.hpp"
+
+inline ShenandoahStackChunkGCData* ShenandoahStackChunkGCData::data(stackChunkOop chunk) {
+#ifdef ASSERT
+  size_t data_size = sizeof(ShenandoahStackChunkGCData);
+  size_t avail_size = InstanceStackChunkKlass::gc_data_size(chunk->stack_size()) * HeapWordSize;
+  assert(data_size <= avail_size, "Data of size %zu must fit in %zu space", data_size, avail_size);
+#endif
+  return reinterpret_cast<ShenandoahStackChunkGCData*>(chunk->gc_data());
+}
+
+inline void ShenandoahStackChunkGCData::initialize(stackChunkOop chunk) {
+  data(chunk)->_epoch = _epoch_id_counter.load_relaxed();
+}
+
+inline bool ShenandoahStackChunkGCData::is_different_epoch(stackChunkOop chunk) {
+  return data(chunk)->_epoch != _epoch_id_counter.load_relaxed();
+}
+
+#endif // SHARE_GC_SHENANDOAH_SHENANDOAHSTACKCHUNKGCDATA_INLINE_HPP