1 /*
2 * Copyright (c) 2003, 2018, 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,
45 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,
50 void* ucontext, bool isInJava) {
51 assert(this->is_Java_thread(), "must be JavaThread");
52 JavaThread* jt = (JavaThread *)this;
53
54 // There is small window where last_Java_frame is not walkable or safe
55 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
56 *fr_addr = jt->pd_last_frame();
57 return true;
58 }
59
60 ucontext_t* uc = (ucontext_t*) ucontext;
61
62 // We always want to use the initial frame we create from the ucontext as
63 // it certainly signals where we currently are. However that frame may not
64 // be safe for calling sender. In that case if we have a last_Java_frame
65 // then the forte walker will switch to that frame as the virtual sender
66 // for the frame we create here which is not sender safe.
67
68 intptr_t* ret_fp;
69 intptr_t* ret_sp;
70 ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc, &ret_sp, &ret_fp);
71
72 // Something would really have to be screwed up to get a NULL pc
73
74 if (addr.pc() == NULL) {
75 assert(false, "NULL pc from signal handler!");
76 return false;
77 }
78
79 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) {
80 // In the middle of a trampoline call. Bail out for safety.
81 // This happens rarely so shouldn't affect profiling.
82 return false;
83 }
84
85 // If sp and fp are nonsense just leave them out
86
87 if (!jt->on_local_stack((address)ret_sp)) {
88 ret_sp = NULL;
89 ret_fp = NULL;
90 } else {
91 // sp is reasonable is fp reasonable?
92 if ((address)ret_fp >= jt->stack_base() || ret_fp < ret_sp) {
93 ret_fp = NULL;
94 }
95 }
96
97 frame ret_frame(ret_sp, ret_fp, addr.pc());
98
99 *fr_addr = ret_frame;
100 return true;
101
102 }
103
cache_global_variables()104 void JavaThread::cache_global_variables() { }
105
106