1 /* 2 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "gc/shared/barrierSet.inline.hpp" 27 #include "gc/shared/cardTable.hpp" 28 #include "gc/shared/cardTableBarrierSet.inline.hpp" 29 #include "gc/shared/collectedHeap.hpp" 30 #include "memory/metaspaceShared.hpp" 31 #include "runtime/frame.inline.hpp" 32 33 void JavaThread::cache_global_variables() { 34 BarrierSet* bs = Universe::heap()->barrier_set(); 35 36 const bool allow_shared_alloc = 37 Universe::heap()->supports_inline_contig_alloc(); 38 39 if (allow_shared_alloc) { 40 _heap_top_addr = (address) Universe::heap()->top_addr(); 41 } else { 42 _heap_top_addr = NULL; 43 } 44 45 if (bs->is_a(BarrierSet::CardTableBarrierSet)) { 46 _card_table_base = (address) (barrier_set_cast<CardTableBarrierSet>(bs)->card_table()->byte_map_base()); 47 } else { 48 _card_table_base = NULL; 49 } 50 51 } 52 53 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is 54 // currently interrupted by SIGPROF 55 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 56 void* ucontext, bool isInJava) { 57 assert(Thread::current() == this, "caller must be current thread"); 58 return pd_get_top_frame(fr_addr, ucontext, isInJava); 59 } 60 61 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) { 62 return pd_get_top_frame(fr_addr, ucontext, isInJava); 63 } 64 65 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) { 66 assert(this->is_Java_thread(), "must be JavaThread"); 67 68 JavaThread* jt = (JavaThread *)this; 69 70 // If we have a last_Java_frame, then we should use it even if 71 // isInJava == true. It should be more reliable than ucontext info. 72 if (jt->has_last_Java_frame() AARCH64_ONLY(&& jt->last_Java_pc() != NULL)) { 73 *fr_addr = jt->pd_last_frame(); 74 return true; 75 } 76 77 // Could be in a code section that plays with the stack, like 78 // MacroAssembler::verify_heapbase() 79 if (jt->in_top_frame_unsafe_section()) { 80 return false; 81 } 82 83 // At this point, we don't have a last_Java_frame, so 84 // we try to glean some information out of the ucontext 85 // if we were running Java code when SIGPROF came in. 86 if (isInJava) { 87 ucontext_t* uc = (ucontext_t*) ucontext; 88 89 intptr_t* ret_fp; 90 intptr_t* ret_sp; 91 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc, 92 &ret_sp, &ret_fp); 93 if (addr.pc() == NULL || ret_sp == NULL ) { 94 // ucontext wasn't useful 95 return false; 96 } 97 98 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) { 99 // In the middle of a trampoline call. Bail out for safety. 100 // This happens rarely so shouldn't affect profiling. 101 return false; 102 } 103 104 frame ret_frame(ret_sp, ret_fp, addr.pc()); 105 if (!ret_frame.safe_for_sender(jt)) { 106 #ifdef COMPILER2 107 // C2 uses ebp as a general register see if NULL fp helps 108 frame ret_frame2(ret_sp, NULL, addr.pc()); 109 if (!ret_frame2.safe_for_sender(jt)) { 110 // nothing else to try if the frame isn't good 111 return false; 112 } 113 ret_frame = ret_frame2; 114 #else 115 // nothing else to try if the frame isn't good 116 return false; 117 #endif /* COMPILER2 */ 118 } 119 *fr_addr = ret_frame; 120 return true; 121 } 122 123 // nothing else to try 124 return false; 125 }