1 /* 2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "memory/metaspaceShared.hpp" 28 #include "runtime/frame.inline.hpp" 29 #include "runtime/thread.inline.hpp" 30 31 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is 32 // currently interrupted by SIGPROF 33 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 34 void* ucontext, bool isInJava) { 35 36 assert(Thread::current() == this, "caller must be current thread"); 37 return pd_get_top_frame(fr_addr, ucontext, isInJava); 38 } 39 40 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) { 41 return pd_get_top_frame(fr_addr, ucontext, isInJava); 42 } 43 44 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) { 45 assert(this->is_Java_thread(), "must be JavaThread"); 46 JavaThread* jt = (JavaThread *)this; 47 48 // If we have a last_Java_frame, then we should use it even if 49 // isInJava == true. It should be more reliable than ucontext info. 50 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { 51 *fr_addr = jt->pd_last_frame(); 52 return true; 53 } 54 55 // At this point, we don't have a last_Java_frame, so 56 // we try to glean some information out of the ucontext 57 // if we were running Java code when SIGPROF came in. 58 if (isInJava) { 59 ucontext_t* uc = (ucontext_t*) ucontext; 60 61 intptr_t* ret_fp; 62 intptr_t* ret_sp; 63 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc, 64 &ret_sp, &ret_fp); 65 if (addr.pc() == NULL || ret_sp == NULL ) { 66 // ucontext wasn't useful 67 return false; 68 } 69 70 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) { 71 // In the middle of a trampoline call. Bail out for safety. 72 // This happens rarely so shouldn't affect profiling. 73 return false; 74 } 75 76 frame ret_frame(ret_sp, ret_fp, addr.pc()); 77 if (!ret_frame.safe_for_sender(jt)) { 78 #ifdef COMPILER2 79 frame ret_frame2(ret_sp, NULL, addr.pc()); 80 if (!ret_frame2.safe_for_sender(jt)) { 81 // nothing else to try if the frame isn't good 82 return false; 83 } 84 ret_frame = ret_frame2; 85 #else 86 // nothing else to try if the frame isn't good 87 return false; 88 #endif /* COMPILER2 */ 89 } 90 *fr_addr = ret_frame; 91 return true; 92 } 93 94 // nothing else to try 95 return false; 96 } 97 98 void JavaThread::cache_global_variables() { } 99