Mon, 28 May 2018 10:33:52 +0800
Merge
1 /*
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "runtime/frame.inline.hpp"
27 #include "runtime/thread.inline.hpp"
29 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is
30 // currently interrupted by SIGPROF
31 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
32 void* ucontext, bool isInJava) {
33 assert(Thread::current() == this, "caller must be current thread");
34 return pd_get_top_frame(fr_addr, ucontext, isInJava);
35 }
37 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
38 return pd_get_top_frame(fr_addr, ucontext, isInJava);
39 }
41 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
42 assert(this->is_Java_thread(), "must be JavaThread");
43 JavaThread* jt = (JavaThread *)this;
45 // If we have a last_Java_frame, then we should use it even if
46 // isInJava == true. It should be more reliable than ucontext info.
47 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
48 *fr_addr = jt->pd_last_frame();
49 return true;
50 }
52 // At this point, we don't have a last_Java_frame, so
53 // we try to glean some information out of the ucontext
54 // if we were running Java code when SIGPROF came in.
55 if (isInJava) {
56 ucontext_t* uc = (ucontext_t*) ucontext;
58 intptr_t* ret_fp;
59 intptr_t* ret_sp;
60 ExtendedPC addr = os::Bsd::fetch_frame_from_ucontext(this, uc,
61 &ret_sp, &ret_fp);
62 if (addr.pc() == NULL || ret_sp == NULL ) {
63 // ucontext wasn't useful
64 return false;
65 }
67 frame ret_frame(ret_sp, ret_fp, addr.pc());
68 if (!ret_frame.safe_for_sender(jt)) {
69 #ifdef COMPILER2
70 // C2 uses ebp as a general register see if NULL fp helps
71 frame ret_frame2(ret_sp, NULL, addr.pc());
72 if (!ret_frame2.safe_for_sender(jt)) {
73 // nothing else to try if the frame isn't good
74 return false;
75 }
76 ret_frame = ret_frame2;
77 #else
78 // nothing else to try if the frame isn't good
79 return false;
80 #endif /* COMPILER2 */
81 }
82 *fr_addr = ret_frame;
83 return true;
84 }
86 // nothing else to try
87 return false;
88 }
90 void JavaThread::cache_global_variables() { }