Mercurial > hg > graal-compiler
annotate src/os_cpu/solaris_sparc/vm/thread_solaris_sparc.cpp @ 403:b744678d4d71
6752257: Use NOT instead of XOR -1 on x86
Summary: add match rule for xor -1
Reviewed-by: never, kvn
author | rasbold |
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date | Fri, 10 Oct 2008 09:47:56 -0700 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2003-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_thread_solaris_sparc.cpp.incl" | |
27 | |
28 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
29 // currently interrupted by SIGPROF | |
30 // | |
31 // NOTE: On Solaris, register windows are flushed in the signal handler | |
32 // except for possibly the top frame. | |
33 // | |
34 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, | |
35 void* ucontext, bool isInJava) { | |
36 | |
37 assert(Thread::current() == this, "caller must be current thread"); | |
38 assert(this->is_Java_thread(), "must be JavaThread"); | |
39 | |
40 JavaThread* jt = (JavaThread *)this; | |
41 | |
42 if (!isInJava) { | |
43 // make_walkable flushes register windows and grabs last_Java_pc | |
44 // which can not be done if the ucontext sp matches last_Java_sp | |
45 // stack walking utilities assume last_Java_pc set if marked flushed | |
46 jt->frame_anchor()->make_walkable(jt); | |
47 } | |
48 | |
49 // If we have a walkable last_Java_frame, then we should use it | |
50 // even if isInJava == true. It should be more reliable than | |
51 // ucontext info. | |
52 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { | |
53 *fr_addr = jt->pd_last_frame(); | |
54 return true; | |
55 } | |
56 | |
57 ucontext_t* uc = (ucontext_t*) ucontext; | |
58 | |
59 // At this point, we don't have a walkable last_Java_frame, so | |
60 // we try to glean some information out of the ucontext. | |
61 intptr_t* ret_sp; | |
62 ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc, | |
63 &ret_sp, NULL /* ret_fp only used on Solaris X86 */); | |
64 if (addr.pc() == NULL || ret_sp == NULL) { | |
65 // ucontext wasn't useful | |
66 return false; | |
67 } | |
68 | |
107
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69 frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); |
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70 |
0 | 71 // we were running Java code when SIGPROF came in |
72 if (isInJava) { | |
107
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73 |
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74 |
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75 // If the frame we got is safe then it is most certainly valid |
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76 if (ret_frame.safe_for_sender(jt)) { |
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77 *fr_addr = ret_frame; |
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78 return true; |
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79 } |
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80 |
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81 // If it isn't safe then we can try several things to try and get |
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82 // a good starting point. |
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83 // |
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84 // On sparc the frames are almost certainly walkable in the sense |
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85 // of sp/fp linkages. However because of recycling of windows if |
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86 // a piece of code does multiple save's where the initial save creates |
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87 // a real frame with a return pc and the succeeding save's are used to |
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88 // simply get free registers and have no real pc then the pc linkage on these |
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89 // "inner" temporary frames will be bogus. |
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90 // Since there is in general only a nesting level like |
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91 // this one deep in general we'll try and unwind such an "inner" frame |
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92 // here ourselves and see if it makes sense |
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93 |
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94 frame unwind_frame(ret_frame.fp(), frame::unpatchable, addr.pc()); |
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95 |
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96 if (unwind_frame.safe_for_sender(jt)) { |
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97 *fr_addr = unwind_frame; |
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98 return true; |
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99 } |
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100 |
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101 // Well that didn't work. Most likely we're toast on this tick |
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102 // The previous code would try this. I think it is dubious in light |
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103 // of changes to safe_for_sender and the unwind trick above but |
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104 // if it gets us a safe frame who wants to argue. |
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105 |
0 | 106 // If we have a last_Java_sp, then the SIGPROF signal caught us |
107 // right when we were transitioning from _thread_in_Java to a new | |
108 // JavaThreadState. We use last_Java_sp instead of the sp from | |
109 // the ucontext since it should be more reliable. | |
107
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110 |
0 | 111 if (jt->has_last_Java_frame()) { |
112 ret_sp = jt->last_Java_sp(); | |
107
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113 frame ret_frame2(ret_sp, frame::unpatchable, addr.pc()); |
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114 if (ret_frame2.safe_for_sender(jt)) { |
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115 *fr_addr = ret_frame2; |
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116 return true; |
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117 } |
0 | 118 } |
119 | |
107
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120 // This is the best we can do. We will only be able to decode the top frame |
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121 |
0 | 122 *fr_addr = ret_frame; |
123 return true; | |
124 } | |
125 | |
126 // At this point, we know we weren't running Java code. We might | |
127 // have a last_Java_sp, but we don't have a walkable frame. | |
128 // However, we might still be able to construct something useful | |
129 // if the thread was running native code. | |
130 if (jt->has_last_Java_frame()) { | |
131 assert(!jt->frame_anchor()->walkable(), "case covered above"); | |
132 | |
107
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133 frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); |
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134 *fr_addr = ret_frame; |
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135 return true; |
0 | 136 } |
137 | |
107
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138 // nothing else to try but what we found initially |
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139 |
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140 *fr_addr = ret_frame; |
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141 return true; |
0 | 142 } |