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/*
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* Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "jfr/metadata/jfrSerializer.hpp"
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#include "jfr/recorder/checkpoint/types/traceid/jfrTraceId.inline.hpp"
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#include "jfr/recorder/repository/jfrChunkWriter.hpp"
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#include "jfr/recorder/service/jfrOptionSet.hpp"
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#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
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#include "jfr/utilities/jfrTypes.hpp"
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#include "memory/allocation.inline.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/task.hpp"
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#include "runtime/vframe.inline.hpp"
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class vframeStreamSamples : public vframeStreamCommon {
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public:
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// constructor that starts with sender of frame fr (top_frame)
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vframeStreamSamples(JavaThread *jt, frame fr, bool stop_at_java_call_stub);
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void samples_next();
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void stop() {}
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};
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vframeStreamSamples::vframeStreamSamples(JavaThread *jt, frame fr, bool stop_at_java_call_stub) : vframeStreamCommon(jt) {
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_stop_at_java_call_stub = stop_at_java_call_stub;
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_frame = fr;
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// We must always have a valid frame to start filling
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bool filled_in = fill_from_frame();
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assert(filled_in, "invariant");
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}
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// Solaris SPARC Compiler1 needs an additional check on the grandparent
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// of the top_frame when the parent of the top_frame is interpreted and
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// the grandparent is compiled. However, in this method we do not know
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// the relationship of the current _frame relative to the top_frame so
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// we implement a more broad sanity check. When the previous callee is
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// interpreted and the current sender is compiled, we verify that the
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// current sender is also walkable. If it is not walkable, then we mark
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// the current vframeStream as at the end.
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void vframeStreamSamples::samples_next() {
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// handle frames with inlining
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if (_mode == compiled_mode &&
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vframeStreamCommon::fill_in_compiled_inlined_sender()) {
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return;
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}
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// handle general case
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int loop_count = 0;
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int loop_max = MaxJavaStackTraceDepth * 2;
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do {
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loop_count++;
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// By the time we get here we should never see unsafe but better safe then segv'd
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if (loop_count > loop_max || !_frame.safe_for_sender(_thread)) {
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_mode = at_end_mode;
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return;
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}
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_frame = _frame.sender(&_reg_map);
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} while (!fill_from_frame());
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}
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static JfrStackTraceRepository* _instance = NULL;
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JfrStackTraceRepository& JfrStackTraceRepository::instance() {
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return *_instance;
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}
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JfrStackTraceRepository* JfrStackTraceRepository::create() {
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assert(_instance == NULL, "invariant");
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_instance = new JfrStackTraceRepository();
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return _instance;
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}
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void JfrStackTraceRepository::destroy() {
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assert(_instance != NULL, "invarinat");
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delete _instance;
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_instance = NULL;
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}
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JfrStackTraceRepository::JfrStackTraceRepository() : _next_id(0), _entries(0) {
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memset(_table, 0, sizeof(_table));
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}
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class JfrFrameType : public JfrSerializer {
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public:
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void serialize(JfrCheckpointWriter& writer) {
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writer.write_count(JfrStackFrame::NUM_FRAME_TYPES);
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writer.write_key(JfrStackFrame::FRAME_INTERPRETER);
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writer.write("Interpreted");
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writer.write_key(JfrStackFrame::FRAME_JIT);
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writer.write("JIT compiled");
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writer.write_key(JfrStackFrame::FRAME_INLINE);
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writer.write("Inlined");
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writer.write_key(JfrStackFrame::FRAME_NATIVE);
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writer.write("Native");
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}
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};
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bool JfrStackTraceRepository::initialize() {
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return JfrSerializer::register_serializer(TYPE_FRAMETYPE, false, true, new JfrFrameType());
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}
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size_t JfrStackTraceRepository::clear() {
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MutexLockerEx lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
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if (_entries == 0) {
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return 0;
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}
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for (u4 i = 0; i < TABLE_SIZE; ++i) {
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JfrStackTraceRepository::StackTrace* stacktrace = _table[i];
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while (stacktrace != NULL) {
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JfrStackTraceRepository::StackTrace* next = stacktrace->next();
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delete stacktrace;
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stacktrace = next;
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}
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}
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memset(_table, 0, sizeof(_table));
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const size_t processed = _entries;
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_entries = 0;
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return processed;
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}
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traceid JfrStackTraceRepository::add_trace(const JfrStackTrace& stacktrace) {
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MutexLockerEx lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
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const size_t index = stacktrace._hash % TABLE_SIZE;
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const StackTrace* table_entry = _table[index];
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while (table_entry != NULL) {
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if (table_entry->equals(stacktrace)) {
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return table_entry->id();
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}
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table_entry = table_entry->next();
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}
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if (!stacktrace.have_lineno()) {
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return 0;
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}
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traceid id = ++_next_id;
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_table[index] = new StackTrace(id, stacktrace, _table[index]);
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++_entries;
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return id;
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}
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traceid JfrStackTraceRepository::add(const JfrStackTrace& stacktrace) {
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return instance().add_trace(stacktrace);
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}
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traceid JfrStackTraceRepository::record(Thread* thread, int skip /* 0 */) {
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assert(thread == Thread::current(), "invariant");
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JfrThreadLocal* const tl = thread->jfr_thread_local();
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assert(tl != NULL, "invariant");
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if (tl->has_cached_stack_trace()) {
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return tl->cached_stack_trace_id();
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}
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if (!thread->is_Java_thread() || thread->is_hidden_from_external_view()) {
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return 0;
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}
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JfrStackFrame* frames = tl->stackframes();
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if (frames == NULL) {
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// pending oom
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return 0;
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}
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assert(frames != NULL, "invariant");
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assert(tl->stackframes() == frames, "invariant");
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return instance().record_for((JavaThread*)thread, skip,frames, tl->stackdepth());
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}
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traceid JfrStackTraceRepository::record(Thread* thread, int skip, unsigned int* hash) {
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assert(thread == Thread::current(), "invariant");
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JfrThreadLocal* const tl = thread->jfr_thread_local();
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assert(tl != NULL, "invariant");
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if (tl->has_cached_stack_trace()) {
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*hash = tl->cached_stack_trace_hash();
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return tl->cached_stack_trace_id();
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}
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if (!thread->is_Java_thread() || thread->is_hidden_from_external_view()) {
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return 0;
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}
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JfrStackFrame* frames = tl->stackframes();
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if (frames == NULL) {
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// pending oom
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return 0;
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}
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assert(frames != NULL, "invariant");
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assert(tl->stackframes() == frames, "invariant");
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return instance().record_for((JavaThread*)thread, skip, frames, tl->stackdepth(), hash);
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}
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traceid JfrStackTraceRepository::record_for(JavaThread* thread, int skip, JfrStackFrame *frames, u4 max_frames) {
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JfrStackTrace stacktrace(frames, max_frames);
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if (!stacktrace.record_safe(thread, skip)) {
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return 0;
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}
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traceid tid = add(stacktrace);
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if (tid == 0) {
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stacktrace.resolve_linenos();
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tid = add(stacktrace);
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}
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return tid;
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}
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traceid JfrStackTraceRepository::record_for(JavaThread* thread, int skip, JfrStackFrame *frames, u4 max_frames, unsigned int* hash) {
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assert(hash != NULL && *hash == 0, "invariant");
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JfrStackTrace stacktrace(frames, max_frames);
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if (!stacktrace.record_safe(thread, skip, true)) {
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return 0;
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}
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traceid tid = add(stacktrace);
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if (tid == 0) {
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stacktrace.resolve_linenos();
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tid = add(stacktrace);
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}
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*hash = stacktrace._hash;
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return tid;
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}
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size_t JfrStackTraceRepository::write_impl(JfrChunkWriter& sw, bool clear) {
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MutexLockerEx lock(JfrStacktrace_lock, Mutex::_no_safepoint_check_flag);
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assert(_entries > 0, "invariant");
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int count = 0;
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for (u4 i = 0; i < TABLE_SIZE; ++i) {
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JfrStackTraceRepository::StackTrace* stacktrace = _table[i];
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while (stacktrace != NULL) {
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JfrStackTraceRepository::StackTrace* next = stacktrace->next();
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if (stacktrace->should_write()) {
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stacktrace->write(sw);
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++count;
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}
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if (clear) {
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delete stacktrace;
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}
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stacktrace = next;
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}
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}
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if (clear) {
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memset(_table, 0, sizeof(_table));
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_entries = 0;
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}
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return count;
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}
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size_t JfrStackTraceRepository::write(JfrChunkWriter& sw, bool clear) {
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return _entries > 0 ? write_impl(sw, clear) : 0;
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}
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traceid JfrStackTraceRepository::write(JfrCheckpointWriter& writer, traceid id, unsigned int hash) {
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assert(JfrStacktrace_lock->owned_by_self(), "invariant");
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const StackTrace* const trace = resolve_entry(hash, id);
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assert(trace != NULL, "invariant");
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assert(trace->hash() == hash, "invariant");
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assert(trace->id() == id, "invariant");
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trace->write(writer);
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return id;
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}
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JfrStackTraceRepository::StackTrace::StackTrace(traceid id, const JfrStackTrace& trace, JfrStackTraceRepository::StackTrace* next) :
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_next(next),
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_frames(NULL),
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_id(id),
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_nr_of_frames(trace._nr_of_frames),
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_hash(trace._hash),
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_reached_root(trace._reached_root),
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_written(false) {
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if (_nr_of_frames > 0) {
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_frames = NEW_C_HEAP_ARRAY(JfrStackFrame, _nr_of_frames, mtTracing);
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memcpy(_frames, trace._frames, _nr_of_frames * sizeof(JfrStackFrame));
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}
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}
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JfrStackTraceRepository::StackTrace::~StackTrace() {
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if (_frames != NULL) {
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FREE_C_HEAP_ARRAY(JfrStackFrame, _frames);
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}
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}
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bool JfrStackTraceRepository::StackTrace::equals(const JfrStackTrace& rhs) const {
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if (_reached_root != rhs._reached_root || _nr_of_frames != rhs._nr_of_frames || _hash != rhs._hash) {
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return false;
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}
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for (u4 i = 0; i < _nr_of_frames; ++i) {
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if (!_frames[i].equals(rhs._frames[i])) {
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return false;
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}
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}
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return true;
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}
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template <typename Writer>
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static void write_stacktrace(Writer& w, traceid id, bool reached_root, u4 nr_of_frames, const JfrStackFrame* frames) {
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w.write((u8)id);
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w.write((u1)!reached_root);
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w.write(nr_of_frames);
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for (u4 i = 0; i < nr_of_frames; ++i) {
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frames[i].write(w);
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}
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}
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void JfrStackTraceRepository::StackTrace::write(JfrChunkWriter& sw) const {
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assert(!_written, "invariant");
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write_stacktrace(sw, _id, _reached_root, _nr_of_frames, _frames);
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_written = true;
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}
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void JfrStackTraceRepository::StackTrace::write(JfrCheckpointWriter& cpw) const {
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write_stacktrace(cpw, _id, _reached_root, _nr_of_frames, _frames);
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}
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// JfrStackFrame
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bool JfrStackFrame::equals(const JfrStackFrame& rhs) const {
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return _methodid == rhs._methodid && _bci == rhs._bci && _type == rhs._type;
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}
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template <typename Writer>
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static void write_frame(Writer& w, traceid methodid, int line, int bci, u1 type) {
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w.write((u8)methodid);
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w.write((u4)line);
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w.write((u4)bci);
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w.write((u8)type);
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}
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void JfrStackFrame::write(JfrChunkWriter& cw) const {
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write_frame(cw, _methodid, _line, _bci, _type);
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}
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void JfrStackFrame::write(JfrCheckpointWriter& cpw) const {
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write_frame(cpw, _methodid, _line, _bci, _type);
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}
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// invariant is that the entry to be resolved actually exists in the table
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const JfrStackTraceRepository::StackTrace* JfrStackTraceRepository::resolve_entry(unsigned int hash, traceid id) const {
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const size_t index = (hash % TABLE_SIZE);
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const StackTrace* trace = _table[index];
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while (trace != NULL && trace->id() != id) {
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trace = trace->next();
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}
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assert(trace != NULL, "invariant");
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assert(trace->hash() == hash, "invariant");
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assert(trace->id() == id, "invariant");
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return trace;
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}
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void JfrStackFrame::resolve_lineno() {
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assert(_method, "no method pointer");
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assert(_line == 0, "already have linenumber");
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_line = _method->line_number_from_bci(_bci);
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_method = NULL;
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}
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void JfrStackTrace::set_frame(u4 frame_pos, JfrStackFrame& frame) {
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assert(frame_pos < _max_frames, "illegal frame_pos");
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_frames[frame_pos] = frame;
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}
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void JfrStackTrace::resolve_linenos() {
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for(unsigned int i = 0; i < _nr_of_frames; i++) {
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_frames[i].resolve_lineno();
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}
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_lineno = true;
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}
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bool JfrStackTrace::record_safe(JavaThread* thread, int skip, bool leakp /* false */) {
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assert(SafepointSynchronize::safepoint_safe(thread, thread->thread_state())
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|| thread == Thread::current(), "Thread stack needs to be walkable");
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vframeStream vfs(thread);
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u4 count = 0;
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_reached_root = true;
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for(int i = 0; i < skip; i++) {
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if (vfs.at_end()) {
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break;
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}
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vfs.next();
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395 |
}
|
|
396 |
|
|
397 |
while (!vfs.at_end()) {
|
|
398 |
if (count >= _max_frames) {
|
|
399 |
_reached_root = false;
|
|
400 |
break;
|
|
401 |
}
|
|
402 |
const Method* method = vfs.method();
|
|
403 |
const traceid mid = JfrTraceId::use(method, leakp);
|
|
404 |
int type = vfs.is_interpreted_frame() ? JfrStackFrame::FRAME_INTERPRETER : JfrStackFrame::FRAME_JIT;
|
|
405 |
int bci = 0;
|
|
406 |
if (method->is_native()) {
|
|
407 |
type = JfrStackFrame::FRAME_NATIVE;
|
|
408 |
} else {
|
|
409 |
bci = vfs.bci();
|
|
410 |
}
|
|
411 |
// Can we determine if it's inlined?
|
|
412 |
_hash = (_hash << 2) + (unsigned int)(((size_t)mid >> 2) + (bci << 4) + type);
|
|
413 |
_frames[count] = JfrStackFrame(mid, bci, type, method);
|
|
414 |
vfs.next();
|
|
415 |
count++;
|
|
416 |
}
|
|
417 |
|
|
418 |
_nr_of_frames = count;
|
|
419 |
return true;
|
|
420 |
}
|
|
421 |
|
|
422 |
bool JfrStackTrace::record_thread(JavaThread& thread, frame& frame) {
|
|
423 |
vframeStreamSamples st(&thread, frame, false);
|
|
424 |
u4 count = 0;
|
|
425 |
_reached_root = true;
|
|
426 |
|
|
427 |
while (!st.at_end()) {
|
|
428 |
if (count >= _max_frames) {
|
|
429 |
_reached_root = false;
|
|
430 |
break;
|
|
431 |
}
|
|
432 |
const Method* method = st.method();
|
|
433 |
if (!method->is_valid_method()) {
|
|
434 |
// we throw away everything we've gathered in this sample since
|
|
435 |
// none of it is safe
|
|
436 |
return false;
|
|
437 |
}
|
|
438 |
const traceid mid = JfrTraceId::use(method);
|
|
439 |
int type = st.is_interpreted_frame() ? JfrStackFrame::FRAME_INTERPRETER : JfrStackFrame::FRAME_JIT;
|
|
440 |
int bci = 0;
|
|
441 |
if (method->is_native()) {
|
|
442 |
type = JfrStackFrame::FRAME_NATIVE;
|
|
443 |
} else {
|
|
444 |
bci = st.bci();
|
|
445 |
}
|
|
446 |
const int lineno = method->line_number_from_bci(bci);
|
|
447 |
// Can we determine if it's inlined?
|
|
448 |
_hash = (_hash << 2) + (unsigned int)(((size_t)mid >> 2) + (bci << 4) + type);
|
|
449 |
_frames[count] = JfrStackFrame(mid, bci, type, lineno);
|
|
450 |
st.samples_next();
|
|
451 |
count++;
|
|
452 |
}
|
|
453 |
|
|
454 |
_lineno = true;
|
|
455 |
_nr_of_frames = count;
|
|
456 |
return true;
|
|
457 |
}
|
|
458 |
|
|
459 |
void JfrStackTraceRepository::write_metadata(JfrCheckpointWriter& writer) {
|
|
460 |
JfrFrameType fct;
|
|
461 |
writer.write_type(TYPE_FRAMETYPE);
|
|
462 |
fct.serialize(writer);
|
|
463 |
}
|