1 /* 2 * Copyright (c) 2012, 2019, 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 "code/debugInfoRec.hpp" 27 #include "code/nmethod.hpp" 28 #include "code/pcDesc.hpp" 29 #include "jfr/periodic/sampling/jfrCallTrace.hpp" 30 #include "oops/method.hpp" 31 #include "runtime/javaCalls.hpp" 32 #include "runtime/frame.inline.hpp" 33 #include "runtime/registerMap.hpp" 34 #include "runtime/thread.inline.hpp" 35 36 bool JfrGetCallTrace::find_top_frame(frame& top_frame, Method** method, frame& first_frame) { 37 assert(top_frame.cb() != NULL, "invariant"); 38 RegisterMap map(_thread, false); 39 frame candidate = top_frame; 40 int loop_max = MaxJavaStackTraceDepth * 2; 41 for (int i = 0; (loop_max == 0) || (i < loop_max); ++i) { 42 if (candidate.is_entry_frame()) { 43 JavaCallWrapper *jcw = candidate.entry_frame_call_wrapper_if_safe(_thread); 44 if (jcw == NULL || jcw->is_first_frame()) { 45 return false; 46 } 47 } 48 49 if (candidate.is_interpreted_frame()) { 50 JavaThreadState state = _thread->thread_state(); 51 const bool known_valid = (state == _thread_in_native || state == _thread_in_vm || state == _thread_blocked); 52 if (known_valid || candidate.is_interpreted_frame_valid(_thread)) { 53 Method* im = candidate.interpreter_frame_method(); 54 if (known_valid && !Method::is_valid_method(im)) { 55 return false; 56 } 57 *method = im; 58 first_frame = candidate; 59 return true; 60 } 61 } 62 63 if (candidate.cb()->is_nmethod()) { 64 // first check to make sure that we have a sane stack, 65 // the PC is actually inside the code part of the codeBlob, 66 // and we are past is_frame_complete_at (stack has been setup) 67 if (!candidate.safe_for_sender(_thread)) { 68 return false; 69 } 70 nmethod* nm = (nmethod*)candidate.cb(); 71 *method = nm->method(); 72 73 if (_in_java) { 74 PcDesc* pc_desc = nm->pc_desc_near(candidate.pc() + 1); 75 if (pc_desc == NULL || pc_desc->scope_decode_offset() == DebugInformationRecorder::serialized_null) { 76 return false; 77 } 78 candidate.set_pc(pc_desc->real_pc(nm)); 79 assert(nm->pc_desc_at(candidate.pc()) != NULL, "invalid pc"); 80 } 81 first_frame = candidate; 82 return true; 83 } 84 85 if (!candidate.safe_for_sender(_thread) || 86 candidate.is_stub_frame() || 87 candidate.cb()->frame_size() <= 0) { 88 return false; 89 } 90 91 candidate = candidate.sender(&map); 92 if (candidate.cb() == NULL) { 93 return false; 94 } 95 } 96 return false; 97 } 98 99 bool JfrGetCallTrace::get_topframe(void* ucontext, frame& topframe) { 100 if (!_thread->pd_get_top_frame_for_profiling(&topframe, ucontext, _in_java)) { 101 return false; 102 } 103 104 if (topframe.cb() == NULL) { 105 return false; 106 } 107 108 frame first_java_frame; 109 Method* method = NULL; 110 if (find_top_frame(topframe, &method, first_java_frame)) { 111 if (method == NULL) { 112 return false; 113 } 114 topframe = first_java_frame; 115 return true; 116 } 117 return false; 118 }