1 /*
2 * Copyright (c) 2003, 2020, 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
pd_last_frame()31 frame JavaThread::pd_last_frame() {
32 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
33 return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());
34 }
35
36 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is
37 // currently interrupted by SIGPROF
pd_get_top_frame_for_signal_handler(frame * fr_addr,void * ucontext,bool isInJava)38 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
39 void* ucontext, bool isInJava) {
40
41 assert(Thread::current() == this, "caller must be current thread");
42 return pd_get_top_frame(fr_addr, ucontext, isInJava);
43 }
44
pd_get_top_frame_for_profiling(frame * fr_addr,void * ucontext,bool isInJava)45 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
46 return pd_get_top_frame(fr_addr, ucontext, isInJava);
47 }
48
pd_get_top_frame(frame * fr_addr,void * ucontext,bool isInJava)49 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
50 // If we have a last_Java_frame, then we should use it even if
51 // isInJava == true. It should be more reliable than ucontext info.
52 if (has_last_Java_frame() && frame_anchor()->walkable()) {
53 *fr_addr = pd_last_frame();
54 return true;
55 }
56
57 // At this point, we don't have a last_Java_frame, so
58 // we try to glean some information out of the ucontext
59 // if we were running Java code when SIGPROF came in.
60 if (isInJava) {
61 ucontext_t* uc = (ucontext_t*) ucontext;
62
63 intptr_t* ret_fp;
64 intptr_t* ret_sp;
65 address addr = os::fetch_frame_from_context(uc, &ret_sp, &ret_fp);
66 if (addr == NULL || ret_sp == NULL ) {
67 // ucontext wasn't useful
68 return false;
69 }
70
71 if (MetaspaceShared::is_in_trampoline_frame(addr)) {
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
77 frame ret_frame(ret_sp, ret_fp, addr);
78 if (!ret_frame.safe_for_sender(this)) {
79 #ifdef COMPILER2
80 frame ret_frame2(ret_sp, NULL, addr);
81 if (!ret_frame2.safe_for_sender(this)) {
82 // nothing else to try if the frame isn't good
83 return false;
84 }
85 ret_frame = ret_frame2;
86 #else
87 // nothing else to try if the frame isn't good
88 return false;
89 #endif /* COMPILER2 */
90 }
91 *fr_addr = ret_frame;
92 return true;
93 }
94
95 // nothing else to try
96 return false;
97 }
98
cache_global_variables()99 void JavaThread::cache_global_variables() { }
100