| /* |
| * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "code/debugInfoRec.hpp" |
| #include "code/nmethod.hpp" |
| #include "code/pcDesc.hpp" |
| #include "jfr/periodic/sampling/jfrCallTrace.hpp" |
| #include "jfr/utilities/jfrTypes.hpp" |
| #include "oops/method.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/frame.inline.hpp" |
| #include "runtime/registerMap.hpp" |
| #include "runtime/thread.inline.hpp" |
| |
| bool JfrGetCallTrace::find_top_frame(frame& top_frame, Method** method, frame& first_frame) { |
| assert(top_frame.cb() != NULL, "invariant"); |
| RegisterMap map(_thread, false); |
| frame candidate = top_frame; |
| for (u4 i = 0; i < MAX_STACK_DEPTH * 2; ++i) { |
| if (candidate.is_entry_frame()) { |
| JavaCallWrapper *jcw = candidate.entry_frame_call_wrapper_if_safe(_thread); |
| if (jcw == NULL || jcw->is_first_frame()) { |
| return false; |
| } |
| } |
| |
| if (candidate.is_interpreted_frame()) { |
| JavaThreadState state = _thread->thread_state(); |
| const bool known_valid = (state == _thread_in_native || state == _thread_in_vm || state == _thread_blocked); |
| if (known_valid || candidate.is_interpreted_frame_valid(_thread)) { |
| Method* im = candidate.interpreter_frame_method(); |
| if (known_valid && !Method::is_valid_method(im)) { |
| return false; |
| } |
| *method = im; |
| first_frame = candidate; |
| return true; |
| } |
| } |
| |
| if (candidate.cb()->is_nmethod()) { |
| // first check to make sure that we have a sane stack, |
| // the PC is actually inside the code part of the codeBlob, |
| // and we are past is_frame_complete_at (stack has been setup) |
| if (!candidate.safe_for_sender(_thread)) { |
| return false; |
| } |
| nmethod* nm = (nmethod*)candidate.cb(); |
| *method = nm->method(); |
| |
| if (_in_java) { |
| PcDesc* pc_desc = nm->pc_desc_near(candidate.pc() + 1); |
| if (pc_desc == NULL || pc_desc->scope_decode_offset() == DebugInformationRecorder::serialized_null) { |
| return false; |
| } |
| candidate.set_pc(pc_desc->real_pc(nm)); |
| assert(nm->pc_desc_at(candidate.pc()) != NULL, "invalid pc"); |
| } |
| first_frame = candidate; |
| return true; |
| } |
| |
| if (!candidate.safe_for_sender(_thread) || |
| candidate.is_stub_frame() || |
| candidate.cb()->frame_size() <= 0) { |
| return false; |
| } |
| |
| candidate = candidate.sender(&map); |
| if (candidate.cb() == NULL) { |
| return false; |
| } |
| } |
| return false; |
| } |
| |
| bool JfrGetCallTrace::get_topframe(void* ucontext, frame& topframe) { |
| if (!_thread->pd_get_top_frame_for_profiling(&topframe, ucontext, _in_java)) { |
| return false; |
| } |
| |
| if (topframe.cb() == NULL) { |
| return false; |
| } |
| |
| frame first_java_frame; |
| Method* method = NULL; |
| if (find_top_frame(topframe, &method, first_java_frame)) { |
| if (method == NULL) { |
| return false; |
| } |
| topframe = first_java_frame; |
| return true; |
| } |
| return false; |
| } |