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 51 assert(this->is_Java_thread(), "must be JavaThread"); 52 53 JavaThread* jt = (JavaThread *)this; 54 55 // If we have a last_Java_frame, then we should use it even if 56 // isInJava == true. It should be more reliable than CONTEXT info. 57 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { 58 *fr_addr = jt->pd_last_frame(); 59 return true; 60 } 61 62 // At this point, we don't have a last_Java_frame, so 63 // we try to glean some information out of the CONTEXT 64 // if we were running Java code when SIGPROF came in. 65 if (isInJava) { 66 CONTEXT* uc = (CONTEXT*)ucontext; 67 68 #ifdef AMD64 69 intptr_t* ret_fp = (intptr_t*) uc->Rbp; 70 intptr_t* ret_sp = (intptr_t*) uc->Rsp; 71 ExtendedPC addr = ExtendedPC((address)uc->Rip); 72 #else 73 intptr_t* ret_fp = (intptr_t*) uc->Ebp; 74 intptr_t* ret_sp = (intptr_t*) uc->Esp; 75 ExtendedPC addr = ExtendedPC((address)uc->Eip); 76 #endif // AMD64 77 if (addr.pc() == NULL || ret_sp == NULL ) { 78 // CONTEXT wasn't useful 79 return false; 80 } 81 82 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) { 83 // In the middle of a trampoline call. Bail out for safety. 84 // This happens rarely so shouldn't affect profiling. 85 return false; 86 } 87 88 frame ret_frame(ret_sp, ret_fp, addr.pc()); 89 if (!ret_frame.safe_for_sender(jt)) { 90 #if COMPILER2_OR_JVMCI 91 // C2 and JVMCI use ebp as a general register see if NULL fp helps 92 frame ret_frame2(ret_sp, NULL, addr.pc()); 93 if (!ret_frame2.safe_for_sender(jt)) { 94 // nothing else to try if the frame isn't good 95 return false; 96 } 97 ret_frame = ret_frame2; 98 #else 99 // nothing else to try if the frame isn't good 100 return false; 101 #endif // COMPILER2_OR_JVMCI 102 } 103 *fr_addr = ret_frame; 104 return true; 105 } 106 107 // nothing else to try 108 return false; 109 } 110 111 void JavaThread::cache_global_variables() { }