thread_linux_x86.cpp revision 11846:ef326749824a
1/* 2 * Copyright (c) 2003, 2013, 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// For Forte Analyzer AsyncGetCallTrace profiling support - thread is 31// currently interrupted by SIGPROF 32bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 33 void* ucontext, bool isInJava) { 34 35 assert(Thread::current() == this, "caller must be current thread"); 36 return pd_get_top_frame(fr_addr, ucontext, isInJava); 37} 38 39bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) { 40 return pd_get_top_frame(fr_addr, ucontext, isInJava); 41} 42 43bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) { 44 assert(this->is_Java_thread(), "must be JavaThread"); 45 JavaThread* jt = (JavaThread *)this; 46 47 // If we have a last_Java_frame, then we should use it even if 48 // isInJava == true. It should be more reliable than ucontext info. 49 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { 50 *fr_addr = jt->pd_last_frame(); 51 return true; 52 } 53 54 // At this point, we don't have a last_Java_frame, so 55 // we try to glean some information out of the ucontext 56 // if we were running Java code when SIGPROF came in. 57 if (isInJava) { 58 ucontext_t* uc = (ucontext_t*) ucontext; 59 60 intptr_t* ret_fp; 61 intptr_t* ret_sp; 62 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc, 63 &ret_sp, &ret_fp); 64 if (addr.pc() == NULL || ret_sp == NULL ) { 65 // ucontext wasn't useful 66 return false; 67 } 68 69#if INCLUDE_CDS 70 if (UseSharedSpaces && MetaspaceShared::is_in_shared_region(addr.pc(), MetaspaceShared::md)) { 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#endif 76 77 frame ret_frame(ret_sp, ret_fp, addr.pc()); 78 if (!ret_frame.safe_for_sender(jt)) { 79#if defined(COMPILER2) || INCLUDE_JVMCI 80 // C2 and JVMCI use ebp as a general register see if NULL fp helps 81 frame ret_frame2(ret_sp, NULL, addr.pc()); 82 if (!ret_frame2.safe_for_sender(jt)) { 83 // nothing else to try if the frame isn't good 84 return false; 85 } 86 ret_frame = ret_frame2; 87#else 88 // nothing else to try if the frame isn't good 89 return false; 90#endif /* COMPILER2 || INCLUDE_JVMCI */ 91 } 92 *fr_addr = ret_frame; 93 return true; 94 } 95 96 // nothing else to try 97 return false; 98} 99 100void JavaThread::cache_global_variables() { } 101 102