thread_linux_aarch64.cpp revision 11845:fefcad79cedf 
1/*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26#include "precompiled.hpp"
27#include "memory/metaspaceShared.hpp"
28#include "runtime/frame.inline.hpp"
29#include "runtime/thread.inline.hpp"
30
31// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
32// currently interrupted by SIGPROF
33bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
34  void* ucontext, bool isInJava) {
35
36  assert(Thread::current() == this, "caller must be current thread");
37  return pd_get_top_frame(fr_addr, ucontext, isInJava);
38}
39
40bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
41  return pd_get_top_frame(fr_addr, ucontext, isInJava);
42}
43
44bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
45  assert(this->is_Java_thread(), "must be JavaThread");
46  JavaThread* jt = (JavaThread *)this;
47
48  // If we have a last_Java_frame, then we should use it even if
49  // isInJava == true.  It should be more reliable than ucontext info.
50  if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
51    *fr_addr = jt->pd_last_frame();
52    return true;
53  }
54
55  // At this point, we don't have a last_Java_frame, so
56  // we try to glean some information out of the ucontext
57  // if we were running Java code when SIGPROF came in.
58  if (isInJava) {
59    ucontext_t* uc = (ucontext_t*) ucontext;
60
61    intptr_t* ret_fp;
62    intptr_t* ret_sp;
63    ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc,
64      &ret_sp, &ret_fp);
65    if (addr.pc() == NULL || ret_sp == NULL ) {
66      // ucontext wasn't useful
67      return false;
68    }
69
70#if INCLUDE_CDS
71    if (UseSharedSpaces && MetaspaceShared::is_in_shared_region(addr.pc(), MetaspaceShared::md)) {
72      // In the middle of a trampoline call. Bail out for safety.
73      // This happens rarely so shouldn't affect profiling.
74      return false;
75    }
76#endif
77
78    frame ret_frame(ret_sp, ret_fp, addr.pc());
79    if (!ret_frame.safe_for_sender(jt)) {
80#ifdef COMPILER2
81      frame ret_frame2(ret_sp, NULL, addr.pc());
82      if (!ret_frame2.safe_for_sender(jt)) {
83        // nothing else to try if the frame isn't good
84        return false;
85      }
86      ret_frame = ret_frame2;
87#else
88      // nothing else to try if the frame isn't good
89      return false;
90#endif /* COMPILER2 */
91    }
92    *fr_addr = ret_frame;
93    return true;
94  }
95
96  // nothing else to try
97  return false;
98}
99
100void JavaThread::cache_global_variables() { }
101
102