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diff --git a/include/sal/backtrace.hxx b/include/sal/backtrace.hxx
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+++ b/include/sal/backtrace.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_SAL_BACKTRACE_HXX
+#define INCLUDED_SAL_BACKTRACE_HXX
+
+#include "sal/config.h"
+#include "sal/saldllapi.h"
+#include "sal/types.h"
+#include "rtl/ustring.hxx"
+#include <memory>
+
+/// @cond INTERNAL
+/**
+  Two stage API for recording and then later decoding stack backtraces.
+  Useful for debugging facilities where we are only interested in decoding
+  a small handful of recorded stack traces.
+
+  @param backtraceDepth value indicating the maximum backtrace depth; must be > 0
+
+  @since LibreOffice 6.0
+*/
+#if defined LIBO_INTERNAL_ONLY
+
+namespace sal {
+
+struct BacktraceState {
+    void** buffer;
+    int nDepth;
+    ~BacktraceState() {delete[] buffer;}
+};
+
+SAL_DLLPUBLIC std::unique_ptr<BacktraceState> backtrace_get(
+    sal_uInt32 backtraceDepth);
+
+SAL_DLLPUBLIC OUString backtrace_to_string(BacktraceState* backtraceState);
+
+}
+
+#endif
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */