jdk
92 строки · 3.2 Кб
1/*
2* Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
3* Copyright (c) 2020, 2021, Huawei Technologies Co., Ltd. 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 "runtime/frame.inline.hpp"
28#include "runtime/javaThread.hpp"
29
30frame JavaThread::pd_last_frame() {
31assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
32return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc());
33}
34
35// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
36// currently interrupted by SIGPROF
37bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
38void* ucontext, bool isInJava) {
39
40assert(Thread::current() == this, "caller must be current thread");
41return pd_get_top_frame(fr_addr, ucontext, isInJava);
42}
43
44bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
45return pd_get_top_frame(fr_addr, ucontext, isInJava);
46}
47
48bool 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.
51if (has_last_Java_frame() && frame_anchor()->walkable()) {
52*fr_addr = pd_last_frame();
53return 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.
59if (isInJava) {
60ucontext_t* uc = (ucontext_t*) ucontext;
61
62intptr_t* ret_fp = nullptr;
63intptr_t* ret_sp = nullptr;
64address addr = os::fetch_frame_from_context(uc, &ret_sp, &ret_fp);
65if (addr == nullptr || ret_sp == nullptr ) {
66// ucontext wasn't useful
67return false;
68}
69
70frame ret_frame(ret_sp, ret_fp, addr);
71if (!ret_frame.safe_for_sender(this)) {
72#ifdef COMPILER2
73frame ret_frame2(ret_sp, nullptr, addr);
74if (!ret_frame2.safe_for_sender(this)) {
75// nothing else to try if the frame isn't good
76return false;
77}
78ret_frame = ret_frame2;
79#else
80// nothing else to try if the frame isn't good
81return false;
82#endif /* COMPILER2 */
83}
84*fr_addr = ret_frame;
85return true;
86}
87
88// nothing else to try
89return false;
90}
91
92void JavaThread::cache_global_variables() { }
93