--- /dev/null	2019-01-28 17:46:38.000000000 +0800
+++ new/src/share/vm/jfr/periodic/sampling/jfrCallTrace.cpp	2019-01-28 17:46:38.000000000 +0800
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2012, 2019, Oracle and/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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "code/debugInfoRec.hpp"
+#include "code/nmethod.hpp"
+#include "code/pcDesc.hpp"
+#include "jfr/periodic/sampling/jfrCallTrace.hpp"
+#include "oops/method.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/frame.inline.hpp"
+#include "runtime/registerMap.hpp"
+#include "runtime/thread.inline.hpp"
+
+bool JfrGetCallTrace::find_top_frame(frame& top_frame, Method** method, frame& first_frame) {
+  assert(top_frame.cb() != NULL, "invariant");
+  RegisterMap map(_thread, false);
+  frame candidate = top_frame;
+  for (int i = 0; i < MaxJavaStackTraceDepth * 2; ++i) {
+    if (candidate.is_entry_frame()) {
+      JavaCallWrapper *jcw = candidate.entry_frame_call_wrapper_if_safe(_thread);
+      if (jcw == NULL || jcw->is_first_frame()) {
+        return false;
+      }
+    }
+
+    if (candidate.is_interpreted_frame()) {
+      JavaThreadState state = _thread->thread_state();
+      const bool known_valid = (state == _thread_in_native || state == _thread_in_vm || state == _thread_blocked);
+      if (known_valid || candidate.is_interpreted_frame_valid(_thread)) {
+        Method* im = candidate.interpreter_frame_method();
+        if (known_valid && !im->is_valid_method()) {
+          return false;
+        }
+        *method = im;
+        first_frame = candidate;
+        return true;
+      }
+    }
+
+    if (candidate.cb()->is_nmethod()) {
+      // first check to make sure that we have a sane stack,
+      // the PC is actually inside the code part of the codeBlob,
+      // and we are past is_frame_complete_at (stack has been setup)
+      if (!candidate.safe_for_sender(_thread)) {
+        return false;
+      }
+      nmethod* nm = (nmethod*)candidate.cb();
+      *method = nm->method();
+
+      if (_in_java) {
+        PcDesc* pc_desc = nm->pc_desc_near(candidate.pc() + 1);
+        if (pc_desc == NULL || pc_desc->scope_decode_offset() == DebugInformationRecorder::serialized_null) {
+          return false;
+        }
+        candidate.set_pc(pc_desc->real_pc(nm));
+        assert(nm->pc_desc_at(candidate.pc()) != NULL, "invalid pc");
+      }
+      first_frame = candidate;
+      return true;
+    }
+
+    if (!candidate.safe_for_sender(_thread) ||
+      candidate.is_stub_frame() ||
+      candidate.cb()->frame_size() <= 0) {
+      return false;
+    }
+
+    candidate = candidate.sender(&map);
+    if (candidate.cb() == NULL) {
+      return false;
+    }
+  }
+  return false;
+}
+
+bool JfrGetCallTrace::get_topframe(void* ucontext, frame& topframe) {
+  if (!_thread->pd_get_top_frame_for_profiling(&topframe, ucontext, _in_java)) {
+    return false;
+  }
+
+  if (topframe.cb() == NULL) {
+    return false;
+  }
+
+  frame first_java_frame;
+  Method* method = NULL;
+  if (find_top_frame(topframe, &method, first_java_frame)) {
+    if (method == NULL) {
+      return false;
+    }
+    topframe = first_java_frame;
+    return true;
+  }
+  return false;
+}