1 /*
2 * Copyright (c) 2003, 2020, 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 */
24
25 #include "precompiled.hpp"
26 #include "memory/metaspaceShared.hpp"
27 #include "runtime/frame.inline.hpp"
28 #include "runtime/thread.inline.hpp"
29
pd_last_frame()30 frame JavaThread::pd_last_frame() {
31 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
32 vmassert(_anchor.last_Java_pc() != NULL, "not walkable");
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 assert(Thread::current() == this, "caller must be current thread");
41 return pd_get_top_frame(fr_addr, ucontext, isInJava);
42 }
43
pd_get_top_frame_for_profiling(frame * fr_addr,void * ucontext,bool isInJava)44 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
45 return pd_get_top_frame(fr_addr, ucontext, isInJava);
46 }
47
pd_get_top_frame(frame * fr_addr,void * ucontext,bool isInJava)48 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
49 // If we have a last_Java_frame, then we should use it even if
50 // isInJava == true. It should be more reliable than ucontext info.
51 if (has_last_Java_frame() && frame_anchor()->walkable()) {
52 *fr_addr = pd_last_frame();
53 return true;
54 }
55
56 // At this point, we don't have a last_Java_frame, so
57 // we try to glean some information out of the ucontext
58 // if we were running Java code when SIGPROF came in.
59 if (isInJava) {
60 ucontext_t* uc = (ucontext_t*) ucontext;
61
62 intptr_t* ret_fp;
63 intptr_t* ret_sp;
64 address addr = os::fetch_frame_from_context(uc, &ret_sp, &ret_fp);
65 if (addr == NULL || ret_sp == NULL ) {
66 // ucontext wasn't useful
67 return false;
68 }
69
70 if (MetaspaceShared::is_in_trampoline_frame(addr)) {
71 // In the middle of a trampoline call. Bail out for safety.
72 // This happens rarely so shouldn't affect profiling.
73 return false;
74 }
75
76 frame ret_frame(ret_sp, ret_fp, addr);
77 if (!ret_frame.safe_for_sender(this)) {
78 #if COMPILER2_OR_JVMCI
79 // C2 and JVMCI use ebp as a general register see if NULL fp helps
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_OR_JVMCI
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