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1 /* |
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2 * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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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. |
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22 * |
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23 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "gc/shared/barrierSet.inline.hpp" |
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27 #include "gc/shared/cardTableModRefBS.inline.hpp" |
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28 #include "gc/shared/collectedHeap.hpp" |
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29 #include "memory/metaspaceShared.hpp" |
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30 #include "runtime/frame.inline.hpp" |
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31 |
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32 void JavaThread::cache_global_variables() { |
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33 BarrierSet* bs = Universe::heap()->barrier_set(); |
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34 |
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35 const bool allow_shared_alloc = |
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36 Universe::heap()->supports_inline_contig_alloc(); |
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37 |
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38 if (allow_shared_alloc) { |
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39 _heap_top_addr = (address) Universe::heap()->top_addr(); |
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40 } else { |
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41 _heap_top_addr = NULL; |
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42 } |
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43 |
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44 if (bs->is_a(BarrierSet::CardTableModRef)) { |
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45 _card_table_base = (address) (barrier_set_cast<CardTableModRefBS>(bs)->byte_map_base); |
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46 } else { |
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47 _card_table_base = NULL; |
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48 } |
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49 |
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50 } |
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51 |
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52 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is |
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53 // currently interrupted by SIGPROF |
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54 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, |
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55 void* ucontext, bool isInJava) { |
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56 assert(Thread::current() == this, "caller must be current thread"); |
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57 return pd_get_top_frame(fr_addr, ucontext, isInJava); |
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58 } |
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59 |
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60 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) { |
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61 return pd_get_top_frame(fr_addr, ucontext, isInJava); |
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62 } |
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63 |
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64 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) { |
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65 assert(this->is_Java_thread(), "must be JavaThread"); |
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66 |
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67 JavaThread* jt = (JavaThread *)this; |
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68 |
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69 // If we have a last_Java_frame, then we should use it even if |
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70 // isInJava == true. It should be more reliable than ucontext info. |
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71 if (jt->has_last_Java_frame() AARCH64_ONLY(&& jt->last_Java_pc() != NULL)) { |
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72 *fr_addr = jt->pd_last_frame(); |
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73 return true; |
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74 } |
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75 |
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76 // Could be in a code section that plays with the stack, like |
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77 // MacroAssembler::verify_heapbase() |
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78 if (jt->in_top_frame_unsafe_section()) { |
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79 return false; |
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80 } |
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81 |
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82 // At this point, we don't have a last_Java_frame, so |
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83 // we try to glean some information out of the ucontext |
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84 // if we were running Java code when SIGPROF came in. |
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85 if (isInJava) { |
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86 ucontext_t* uc = (ucontext_t*) ucontext; |
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87 |
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88 intptr_t* ret_fp; |
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89 intptr_t* ret_sp; |
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90 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc, |
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91 &ret_sp, &ret_fp); |
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92 if (addr.pc() == NULL || ret_sp == NULL ) { |
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93 // ucontext wasn't useful |
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94 return false; |
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95 } |
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96 |
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97 #if INCLUDE_CDS |
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98 if (UseSharedSpaces && MetaspaceShared::is_in_shared_region(addr.pc(), MetaspaceShared::md)) { |
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99 // In the middle of a trampoline call. Bail out for safety. |
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100 // This happens rarely so shouldn't affect profiling. |
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101 return false; |
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102 } |
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103 #endif |
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104 |
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105 frame ret_frame(ret_sp, ret_fp, addr.pc()); |
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106 if (!ret_frame.safe_for_sender(jt)) { |
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107 #ifdef COMPILER2 |
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108 // C2 uses ebp as a general register see if NULL fp helps |
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109 frame ret_frame2(ret_sp, NULL, addr.pc()); |
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110 if (!ret_frame2.safe_for_sender(jt)) { |
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111 // nothing else to try if the frame isn't good |
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112 return false; |
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113 } |
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114 ret_frame = ret_frame2; |
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115 #else |
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116 // nothing else to try if the frame isn't good |
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117 return false; |
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118 #endif /* COMPILER2 */ |
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119 } |
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120 *fr_addr = ret_frame; |
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121 return true; |
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122 } |
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123 |
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124 // nothing else to try |
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125 return false; |
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126 } |