1 /* 2 * Copyright (c) 2003, 2017, 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 "memory/metaspaceShared.hpp" 27 #include "runtime/frame.inline.hpp" 28 #include "runtime/thread.inline.hpp" 29 30 frame JavaThread::pd_last_frame() { 31 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended"); 32 vmassert(_anchor.last_Java_pc() != NULL, "not walkable"); 33 return frame(_anchor.last_Java_sp(), _anchor.last_Java_fp(), _anchor.last_Java_pc()); 34 } 35 36 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is 37 // currently interrupted by SIGPROF 38 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 39 void* ucontext, bool isInJava) { 40 assert(Thread::current() == this, "caller must be current thread"); 41 return pd_get_top_frame(fr_addr, ucontext, isInJava); 42 } 43 44 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, 45 void* ucontext, bool isInJava) { 46 return pd_get_top_frame(fr_addr, ucontext, isInJava); 47 } 48 49 bool JavaThread::pd_get_top_frame(frame* fr_addr, 50 void* ucontext, bool isInJava) { 51 assert(this->is_Java_thread(), "must be JavaThread"); 52 JavaThread* jt = (JavaThread *)this; 53 54 // There is small window where last_Java_frame is not walkable or safe 55 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { 56 *fr_addr = jt->pd_last_frame(); 57 return true; 58 } 59 60 ucontext_t* uc = (ucontext_t*) ucontext; 61 62 // We always want to use the initial frame we create from the ucontext as 63 // it certainly signals where we currently are. However that frame may not 64 // be safe for calling sender. In that case if we have a last_Java_frame 65 // then the forte walker will switch to that frame as the virtual sender 66 // for the frame we create here which is not sender safe. 67 68 intptr_t* ret_fp; 69 intptr_t* ret_sp; 70 ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc, &ret_sp, &ret_fp); 71 72 // Something would really have to be screwed up to get a NULL pc 73 74 if (addr.pc() == NULL) { 75 assert(false, "NULL pc from signal handler!"); 76 return false; 77 } 78 79 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) { 80 // In the middle of a trampoline call. Bail out for safety. 81 // This happens rarely so shouldn't affect profiling. 82 return false; 83 } 84 85 // If sp and fp are nonsense just leave them out 86 87 if (!jt->on_local_stack((address)ret_sp)) { 88 ret_sp = NULL; 89 ret_fp = NULL; 90 } else { 91 // sp is reasonable is fp reasonable? 92 if ((address)ret_fp >= jt->stack_base() || ret_fp < ret_sp) { 93 ret_fp = NULL; 94 } 95 } 96 97 frame ret_frame(ret_sp, ret_fp, addr.pc()); 98 99 *fr_addr = ret_frame; 100 return true; 101 102 } 103 104 void JavaThread::cache_global_variables() { } 105