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 41 assert(Thread::current() == this, "caller must be current thread"); 42 return pd_get_top_frame(fr_addr, ucontext, isInJava); 43 } 44 45 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, 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, void* ucontext, bool isInJava) { 50 assert(this->is_Java_thread(), "must be JavaThread"); 51 JavaThread* jt = (JavaThread *)this; 52 53 // If we have a last_Java_frame, then we should use it even if 54 // isInJava == true. It should be more reliable than ucontext info. 55 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { 56 *fr_addr = jt->pd_last_frame(); 57 return true; 58 } 59 60 // At this point, we don't have a last_Java_frame, so 61 // we try to glean some information out of the ucontext 62 // if we were running Java code when SIGPROF came in. 63 if (isInJava) { 64 ucontext_t* uc = (ucontext_t*) ucontext; 65 66 intptr_t* ret_fp; 67 intptr_t* ret_sp; 68 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc, 69 &ret_sp, &ret_fp); 70 if (addr.pc() == NULL || ret_sp == NULL ) { 71 // ucontext wasn't useful 72 return false; 73 } 74 75 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) { 76 // In the middle of a trampoline call. Bail out for safety. 77 // This happens rarely so shouldn't affect profiling. 78 return false; 79 } 80 81 frame ret_frame(ret_sp, ret_fp, addr.pc()); 82 if (!ret_frame.safe_for_sender(jt)) { 83 #if COMPILER2_OR_JVMCI 84 // C2 and JVMCI use ebp as a general register see if NULL fp helps 85 frame ret_frame2(ret_sp, NULL, addr.pc()); 86 if (!ret_frame2.safe_for_sender(jt)) { 87 // nothing else to try if the frame isn't good 88 return false; 89 } 90 ret_frame = ret_frame2; 91 #else 92 // nothing else to try if the frame isn't good 93 return false; 94 #endif // COMPILER2_OR_JVMCI 95 } 96 *fr_addr = ret_frame; 97 return true; 98 } 99 100 // nothing else to try 101 return false; 102 } 103 104 void JavaThread::cache_global_variables() { } 105