Mercurial > hg > truffle
annotate src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp @ 15847:9e172511971d
make FixedNodeProbabilityCache behave better in the presence of dead code
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 22 May 2014 14:04:55 +0200 |
parents | f2110083203d |
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rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "runtime/frame.inline.hpp" | |
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27 #include "runtime/thread.inline.hpp" |
0 | 28 |
29 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
30 // currently interrupted by SIGPROF | |
31 // | |
32 // NOTE: On Solaris, register windows are flushed in the signal handler | |
33 // except for possibly the top frame. | |
34 // | |
35 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, | |
36 void* ucontext, bool isInJava) { | |
37 | |
38 assert(Thread::current() == this, "caller must be current thread"); | |
10405 | 39 return pd_get_top_frame(fr_addr, ucontext, isInJava, true); |
40 } | |
41 | |
42 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) { | |
43 // get ucontext somehow | |
44 return pd_get_top_frame(fr_addr, ucontext, isInJava, false); | |
45 } | |
46 | |
47 bool JavaThread::pd_get_top_frame(frame* fr_addr, | |
48 void* ucontext, bool isInJava, bool makeWalkable) { | |
0 | 49 assert(this->is_Java_thread(), "must be JavaThread"); |
50 | |
51 JavaThread* jt = (JavaThread *)this; | |
52 | |
10405 | 53 if (!isInJava && makeWalkable) { |
0 | 54 // make_walkable flushes register windows and grabs last_Java_pc |
55 // which can not be done if the ucontext sp matches last_Java_sp | |
56 // stack walking utilities assume last_Java_pc set if marked flushed | |
57 jt->frame_anchor()->make_walkable(jt); | |
58 } | |
59 | |
60 // If we have a walkable last_Java_frame, then we should use it | |
61 // even if isInJava == true. It should be more reliable than | |
62 // ucontext info. | |
63 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { | |
64 *fr_addr = jt->pd_last_frame(); | |
65 return true; | |
66 } | |
67 | |
68 ucontext_t* uc = (ucontext_t*) ucontext; | |
69 | |
70 // At this point, we don't have a walkable last_Java_frame, so | |
71 // we try to glean some information out of the ucontext. | |
72 intptr_t* ret_sp; | |
73 ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc, | |
74 &ret_sp, NULL /* ret_fp only used on Solaris X86 */); | |
75 if (addr.pc() == NULL || ret_sp == NULL) { | |
76 // ucontext wasn't useful | |
77 return false; | |
78 } | |
79 | |
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80 frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); |
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81 |
0 | 82 // we were running Java code when SIGPROF came in |
83 if (isInJava) { | |
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84 |
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85 |
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86 // If the frame we got is safe then it is most certainly valid |
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87 if (ret_frame.safe_for_sender(jt)) { |
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88 *fr_addr = ret_frame; |
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89 return true; |
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90 } |
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91 |
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92 // If it isn't safe then we can try several things to try and get |
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93 // a good starting point. |
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94 // |
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95 // On sparc the frames are almost certainly walkable in the sense |
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96 // of sp/fp linkages. However because of recycling of windows if |
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97 // a piece of code does multiple save's where the initial save creates |
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98 // a real frame with a return pc and the succeeding save's are used to |
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99 // simply get free registers and have no real pc then the pc linkage on these |
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100 // "inner" temporary frames will be bogus. |
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101 // Since there is in general only a nesting level like |
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102 // this one deep in general we'll try and unwind such an "inner" frame |
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103 // here ourselves and see if it makes sense |
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104 |
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105 frame unwind_frame(ret_frame.fp(), frame::unpatchable, addr.pc()); |
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106 |
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107 if (unwind_frame.safe_for_sender(jt)) { |
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108 *fr_addr = unwind_frame; |
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109 return true; |
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110 } |
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111 |
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112 // Well that didn't work. Most likely we're toast on this tick |
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113 // The previous code would try this. I think it is dubious in light |
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114 // of changes to safe_for_sender and the unwind trick above but |
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115 // if it gets us a safe frame who wants to argue. |
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116 |
0 | 117 // If we have a last_Java_sp, then the SIGPROF signal caught us |
118 // right when we were transitioning from _thread_in_Java to a new | |
119 // JavaThreadState. We use last_Java_sp instead of the sp from | |
120 // the ucontext since it should be more reliable. | |
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121 |
0 | 122 if (jt->has_last_Java_frame()) { |
123 ret_sp = jt->last_Java_sp(); | |
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124 frame ret_frame2(ret_sp, frame::unpatchable, addr.pc()); |
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125 if (ret_frame2.safe_for_sender(jt)) { |
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126 *fr_addr = ret_frame2; |
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127 return true; |
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128 } |
0 | 129 } |
130 | |
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131 // This is the best we can do. We will only be able to decode the top frame |
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132 |
0 | 133 *fr_addr = ret_frame; |
134 return true; | |
135 } | |
136 | |
137 // At this point, we know we weren't running Java code. We might | |
138 // have a last_Java_sp, but we don't have a walkable frame. | |
139 // However, we might still be able to construct something useful | |
140 // if the thread was running native code. | |
141 if (jt->has_last_Java_frame()) { | |
142 assert(!jt->frame_anchor()->walkable(), "case covered above"); | |
143 | |
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144 frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); |
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145 *fr_addr = ret_frame; |
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146 return true; |
0 | 147 } |
148 | |
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149 // nothing else to try but what we found initially |
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150 |
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151 *fr_addr = ret_frame; |
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152 return true; |
0 | 153 } |
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154 |
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155 void JavaThread::cache_global_variables() { } |
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156 |