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annotate src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp @ 20152:cfd1c99206b9
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author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 03 Apr 2015 10:41:28 +0200 |
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133 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
133 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
133 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "runtime/frame.inline.hpp" | |
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27 #include "runtime/thread.inline.hpp" |
133 | 28 |
29 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
30 // currently interrupted by SIGPROF | |
31 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, | |
32 void* ucontext, | |
33 bool isInJava) { | |
34 assert(Thread::current() == this, "caller must be current thread"); | |
35 assert(this->is_Java_thread(), "must be JavaThread"); | |
36 | |
37 JavaThread* jt = (JavaThread *)this; | |
38 | |
39 if (!isInJava) { | |
40 // make_walkable flushes register windows and grabs last_Java_pc | |
41 // which can not be done if the ucontext sp matches last_Java_sp | |
42 // stack walking utilities assume last_Java_pc set if marked flushed | |
43 jt->frame_anchor()->make_walkable(jt); | |
44 } | |
45 | |
46 // If we have a walkable last_Java_frame, then we should use it | |
47 // even if isInJava == true. It should be more reliable than | |
48 // ucontext info. | |
49 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { | |
50 *fr_addr = jt->pd_last_frame(); | |
51 return true; | |
52 } | |
53 | |
54 ucontext_t* uc = (ucontext_t*) ucontext; | |
55 | |
56 // At this point, we don't have a walkable last_Java_frame, so | |
57 // we try to glean some information out of the ucontext. | |
58 intptr_t* ret_sp; | |
59 ExtendedPC addr = | |
60 os::fetch_frame_from_context(uc, &ret_sp, | |
61 NULL /* ret_fp only used on X86 */); | |
62 if (addr.pc() == NULL || ret_sp == NULL) { | |
63 // ucontext wasn't useful | |
64 return false; | |
65 } | |
66 | |
67 // we were running Java code when SIGPROF came in | |
68 if (isInJava) { | |
69 // If we have a last_Java_sp, then the SIGPROF signal caught us | |
70 // right when we were transitioning from _thread_in_Java to a new | |
71 // JavaThreadState. We use last_Java_sp instead of the sp from | |
72 // the ucontext since it should be more reliable. | |
73 if (jt->has_last_Java_frame()) { | |
74 ret_sp = jt->last_Java_sp(); | |
75 } | |
76 // Implied else: we don't have a last_Java_sp so we use what we | |
77 // got from the ucontext. | |
78 | |
79 frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); | |
80 if (!ret_frame.safe_for_sender(jt)) { | |
81 // nothing else to try if the frame isn't good | |
82 return false; | |
83 } | |
84 *fr_addr = ret_frame; | |
85 return true; | |
86 } | |
87 | |
88 // At this point, we know we weren't running Java code. We might | |
89 // have a last_Java_sp, but we don't have a walkable frame. | |
90 // However, we might still be able to construct something useful | |
91 // if the thread was running native code. | |
92 if (jt->has_last_Java_frame()) { | |
93 assert(!jt->frame_anchor()->walkable(), "case covered above"); | |
94 | |
95 if (jt->thread_state() == _thread_in_native) { | |
96 frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); | |
97 if (!ret_frame.safe_for_sender(jt)) { | |
98 // nothing else to try if the frame isn't good | |
99 return false; | |
100 } | |
101 *fr_addr = ret_frame; | |
102 return true; | |
103 } | |
104 } | |
105 | |
106 // nothing else to try | |
107 return false; | |
108 } | |
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109 |
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110 void JavaThread::cache_global_variables() { } |
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111 |