1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "runtime/frame.inline.hpp"
#include "thread_bsd.inline.hpp"
// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
// currently interrupted by SIGPROF
bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
void* ucontext, bool isInJava) {
assert(Thread::current() == this, "caller must be current thread");
assert(this->is_Java_thread(), "must be JavaThread");
JavaThread* jt = (JavaThread *)this;
// If we have a last_Java_frame, then we should use it even if
// isInJava == true. It should be more reliable than ucontext info.
if (jt->has_last_Java_frame()) {
*fr_addr = jt->pd_last_frame();
return true;
}
// At this point, we don't have a last_Java_frame, so
// we try to glean some information out of the ucontext
// if we were running Java code when SIGPROF came in.
if (isInJava) {
ucontext_t* uc = (ucontext_t*) ucontext;
intptr_t* ret_fp;
intptr_t* ret_sp;
ExtendedPC addr = os::Bsd::fetch_frame_from_ucontext(this, uc,
&ret_sp, &ret_fp);
if (addr.pc() == NULL || ret_sp == NULL ) {
// ucontext wasn't useful
return false;
}
frame ret_frame(ret_sp, ret_fp, addr.pc());
if (!ret_frame.safe_for_sender(jt)) {
#ifdef COMPILER2
// C2 uses ebp as a general register see if NULL fp helps
frame ret_frame2(ret_sp, NULL, addr.pc());
if (!ret_frame2.safe_for_sender(jt)) {
// nothing else to try if the frame isn't good
return false;
}
ret_frame = ret_frame2;
#else
// nothing else to try if the frame isn't good
return false;
#endif /* COMPILER2 */
}
*fr_addr = ret_frame;
return true;
}
// nothing else to try
return false;
}
void JavaThread::cache_global_variables() { }
|
