| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "trace.h" |
| |
| #include <sys/uio.h> |
| |
| #include "base/stl_util.h" |
| #include "base/unix_file/fd_file.h" |
| #include "class_linker.h" |
| #include "common_throws.h" |
| #include "debugger.h" |
| #include "dex_file-inl.h" |
| #include "instrumentation.h" |
| #include "mirror/art_method-inl.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/dex_cache.h" |
| #include "mirror/object_array-inl.h" |
| #include "mirror/object-inl.h" |
| #include "os.h" |
| #include "scoped_thread_state_change.h" |
| #include "ScopedLocalRef.h" |
| #include "thread.h" |
| #include "thread_list.h" |
| #if !defined(ART_USE_PORTABLE_COMPILER) |
| #include "entrypoints/quick/quick_entrypoints.h" |
| #endif |
| |
| namespace art { |
| |
| // File format: |
| // header |
| // record 0 |
| // record 1 |
| // ... |
| // |
| // Header format: |
| // u4 magic ('SLOW') |
| // u2 version |
| // u2 offset to data |
| // u8 start date/time in usec |
| // u2 record size in bytes (version >= 2 only) |
| // ... padding to 32 bytes |
| // |
| // Record format v1: |
| // u1 thread ID |
| // u4 method ID | method action |
| // u4 time delta since start, in usec |
| // |
| // Record format v2: |
| // u2 thread ID |
| // u4 method ID | method action |
| // u4 time delta since start, in usec |
| // |
| // Record format v3: |
| // u2 thread ID |
| // u4 method ID | method action |
| // u4 time delta since start, in usec |
| // u4 wall time since start, in usec (when clock == "dual" only) |
| // |
| // 32 bits of microseconds is 70 minutes. |
| // |
| // All values are stored in little-endian order. |
| |
| enum TraceAction { |
| kTraceMethodEnter = 0x00, // method entry |
| kTraceMethodExit = 0x01, // method exit |
| kTraceUnroll = 0x02, // method exited by exception unrolling |
| // 0x03 currently unused |
| kTraceMethodActionMask = 0x03, // two bits |
| }; |
| |
| class BuildStackTraceVisitor : public StackVisitor { |
| public: |
| explicit BuildStackTraceVisitor(Thread* thread) : StackVisitor(thread, NULL), |
| method_trace_(Trace::AllocStackTrace()) {} |
| |
| bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| mirror::ArtMethod* m = GetMethod(); |
| // Ignore runtime frames (in particular callee save). |
| if (!m->IsRuntimeMethod()) { |
| method_trace_->push_back(m); |
| } |
| return true; |
| } |
| |
| // Returns a stack trace where the topmost frame corresponds with the first element of the vector. |
| std::vector<mirror::ArtMethod*>* GetStackTrace() const { |
| return method_trace_; |
| } |
| |
| private: |
| std::vector<mirror::ArtMethod*>* const method_trace_; |
| }; |
| |
| static const char kTraceTokenChar = '*'; |
| static const uint16_t kTraceHeaderLength = 32; |
| static const uint32_t kTraceMagicValue = 0x574f4c53; |
| static const uint16_t kTraceVersionSingleClock = 2; |
| static const uint16_t kTraceVersionDualClock = 3; |
| static const uint16_t kTraceRecordSizeSingleClock = 10; // using v2 |
| static const uint16_t kTraceRecordSizeDualClock = 14; // using v3 with two timestamps |
| |
| TraceClockSource Trace::default_clock_source_ = kDefaultTraceClockSource; |
| |
| Trace* volatile Trace::the_trace_ = NULL; |
| pthread_t Trace::sampling_pthread_ = 0U; |
| std::unique_ptr<std::vector<mirror::ArtMethod*>> Trace::temp_stack_trace_; |
| |
| static mirror::ArtMethod* DecodeTraceMethodId(uint32_t tmid) { |
| return reinterpret_cast<mirror::ArtMethod*>(tmid & ~kTraceMethodActionMask); |
| } |
| |
| static TraceAction DecodeTraceAction(uint32_t tmid) { |
| return static_cast<TraceAction>(tmid & kTraceMethodActionMask); |
| } |
| |
| static uint32_t EncodeTraceMethodAndAction(mirror::ArtMethod* method, |
| TraceAction action) { |
| uint32_t tmid = PointerToLowMemUInt32(method) | action; |
| DCHECK_EQ(method, DecodeTraceMethodId(tmid)); |
| return tmid; |
| } |
| |
| std::vector<mirror::ArtMethod*>* Trace::AllocStackTrace() { |
| if (temp_stack_trace_.get() != NULL) { |
| return temp_stack_trace_.release(); |
| } else { |
| return new std::vector<mirror::ArtMethod*>(); |
| } |
| } |
| |
| void Trace::FreeStackTrace(std::vector<mirror::ArtMethod*>* stack_trace) { |
| stack_trace->clear(); |
| temp_stack_trace_.reset(stack_trace); |
| } |
| |
| void Trace::SetDefaultClockSource(TraceClockSource clock_source) { |
| #if defined(HAVE_POSIX_CLOCKS) |
| default_clock_source_ = clock_source; |
| #else |
| if (clock_source != kTraceClockSourceWall) { |
| LOG(WARNING) << "Ignoring tracing request to use CPU time."; |
| } |
| #endif |
| } |
| |
| static uint16_t GetTraceVersion(TraceClockSource clock_source) { |
| return (clock_source == kTraceClockSourceDual) ? kTraceVersionDualClock |
| : kTraceVersionSingleClock; |
| } |
| |
| static uint16_t GetRecordSize(TraceClockSource clock_source) { |
| return (clock_source == kTraceClockSourceDual) ? kTraceRecordSizeDualClock |
| : kTraceRecordSizeSingleClock; |
| } |
| |
| bool Trace::UseThreadCpuClock() { |
| return (clock_source_ == kTraceClockSourceThreadCpu) || |
| (clock_source_ == kTraceClockSourceDual); |
| } |
| |
| bool Trace::UseWallClock() { |
| return (clock_source_ == kTraceClockSourceWall) || |
| (clock_source_ == kTraceClockSourceDual); |
| } |
| |
| static void MeasureClockOverhead(Trace* trace) { |
| if (trace->UseThreadCpuClock()) { |
| Thread::Current()->GetCpuMicroTime(); |
| } |
| if (trace->UseWallClock()) { |
| MicroTime(); |
| } |
| } |
| |
| // Compute an average time taken to measure clocks. |
| static uint32_t GetClockOverheadNanoSeconds(Trace* trace) { |
| Thread* self = Thread::Current(); |
| uint64_t start = self->GetCpuMicroTime(); |
| |
| for (int i = 4000; i > 0; i--) { |
| MeasureClockOverhead(trace); |
| MeasureClockOverhead(trace); |
| MeasureClockOverhead(trace); |
| MeasureClockOverhead(trace); |
| MeasureClockOverhead(trace); |
| MeasureClockOverhead(trace); |
| MeasureClockOverhead(trace); |
| MeasureClockOverhead(trace); |
| } |
| |
| uint64_t elapsed_us = self->GetCpuMicroTime() - start; |
| return static_cast<uint32_t>(elapsed_us / 32); |
| } |
| |
| // TODO: put this somewhere with the big-endian equivalent used by JDWP. |
| static void Append2LE(uint8_t* buf, uint16_t val) { |
| *buf++ = static_cast<uint8_t>(val); |
| *buf++ = static_cast<uint8_t>(val >> 8); |
| } |
| |
| // TODO: put this somewhere with the big-endian equivalent used by JDWP. |
| static void Append4LE(uint8_t* buf, uint32_t val) { |
| *buf++ = static_cast<uint8_t>(val); |
| *buf++ = static_cast<uint8_t>(val >> 8); |
| *buf++ = static_cast<uint8_t>(val >> 16); |
| *buf++ = static_cast<uint8_t>(val >> 24); |
| } |
| |
| // TODO: put this somewhere with the big-endian equivalent used by JDWP. |
| static void Append8LE(uint8_t* buf, uint64_t val) { |
| *buf++ = static_cast<uint8_t>(val); |
| *buf++ = static_cast<uint8_t>(val >> 8); |
| *buf++ = static_cast<uint8_t>(val >> 16); |
| *buf++ = static_cast<uint8_t>(val >> 24); |
| *buf++ = static_cast<uint8_t>(val >> 32); |
| *buf++ = static_cast<uint8_t>(val >> 40); |
| *buf++ = static_cast<uint8_t>(val >> 48); |
| *buf++ = static_cast<uint8_t>(val >> 56); |
| } |
| |
| static void GetSample(Thread* thread, void* arg) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| BuildStackTraceVisitor build_trace_visitor(thread); |
| build_trace_visitor.WalkStack(); |
| std::vector<mirror::ArtMethod*>* stack_trace = build_trace_visitor.GetStackTrace(); |
| Trace* the_trace = reinterpret_cast<Trace*>(arg); |
| the_trace->CompareAndUpdateStackTrace(thread, stack_trace); |
| } |
| |
| static void ClearThreadStackTraceAndClockBase(Thread* thread, void* arg) { |
| thread->SetTraceClockBase(0); |
| std::vector<mirror::ArtMethod*>* stack_trace = thread->GetStackTraceSample(); |
| thread->SetStackTraceSample(NULL); |
| delete stack_trace; |
| } |
| |
| void Trace::CompareAndUpdateStackTrace(Thread* thread, |
| std::vector<mirror::ArtMethod*>* stack_trace) { |
| CHECK_EQ(pthread_self(), sampling_pthread_); |
| std::vector<mirror::ArtMethod*>* old_stack_trace = thread->GetStackTraceSample(); |
| // Update the thread's stack trace sample. |
| thread->SetStackTraceSample(stack_trace); |
| // Read timer clocks to use for all events in this trace. |
| uint32_t thread_clock_diff = 0; |
| uint32_t wall_clock_diff = 0; |
| ReadClocks(thread, &thread_clock_diff, &wall_clock_diff); |
| if (old_stack_trace == NULL) { |
| // If there's no previous stack trace sample for this thread, log an entry event for all |
| // methods in the trace. |
| for (std::vector<mirror::ArtMethod*>::reverse_iterator rit = stack_trace->rbegin(); |
| rit != stack_trace->rend(); ++rit) { |
| LogMethodTraceEvent(thread, *rit, instrumentation::Instrumentation::kMethodEntered, |
| thread_clock_diff, wall_clock_diff); |
| } |
| } else { |
| // If there's a previous stack trace for this thread, diff the traces and emit entry and exit |
| // events accordingly. |
| std::vector<mirror::ArtMethod*>::reverse_iterator old_rit = old_stack_trace->rbegin(); |
| std::vector<mirror::ArtMethod*>::reverse_iterator rit = stack_trace->rbegin(); |
| // Iterate bottom-up over both traces until there's a difference between them. |
| while (old_rit != old_stack_trace->rend() && rit != stack_trace->rend() && *old_rit == *rit) { |
| old_rit++; |
| rit++; |
| } |
| // Iterate top-down over the old trace until the point where they differ, emitting exit events. |
| for (std::vector<mirror::ArtMethod*>::iterator old_it = old_stack_trace->begin(); |
| old_it != old_rit.base(); ++old_it) { |
| LogMethodTraceEvent(thread, *old_it, instrumentation::Instrumentation::kMethodExited, |
| thread_clock_diff, wall_clock_diff); |
| } |
| // Iterate bottom-up over the new trace from the point where they differ, emitting entry events. |
| for (; rit != stack_trace->rend(); ++rit) { |
| LogMethodTraceEvent(thread, *rit, instrumentation::Instrumentation::kMethodEntered, |
| thread_clock_diff, wall_clock_diff); |
| } |
| FreeStackTrace(old_stack_trace); |
| } |
| } |
| |
| void* Trace::RunSamplingThread(void* arg) { |
| Runtime* runtime = Runtime::Current(); |
| intptr_t interval_us = reinterpret_cast<intptr_t>(arg); |
| CHECK_GE(interval_us, 0); |
| CHECK(runtime->AttachCurrentThread("Sampling Profiler", true, runtime->GetSystemThreadGroup(), |
| !runtime->IsCompiler())); |
| |
| while (true) { |
| usleep(interval_us); |
| ATRACE_BEGIN("Profile sampling"); |
| Thread* self = Thread::Current(); |
| Trace* the_trace; |
| { |
| MutexLock mu(self, *Locks::trace_lock_); |
| the_trace = the_trace_; |
| if (the_trace == NULL) { |
| break; |
| } |
| } |
| |
| runtime->GetThreadList()->SuspendAll(); |
| { |
| MutexLock mu(self, *Locks::thread_list_lock_); |
| runtime->GetThreadList()->ForEach(GetSample, the_trace); |
| } |
| runtime->GetThreadList()->ResumeAll(); |
| ATRACE_END(); |
| } |
| |
| runtime->DetachCurrentThread(); |
| return NULL; |
| } |
| |
| void Trace::Start(const char* trace_filename, int trace_fd, int buffer_size, int flags, |
| bool direct_to_ddms, bool sampling_enabled, int interval_us) { |
| Thread* self = Thread::Current(); |
| { |
| MutexLock mu(self, *Locks::trace_lock_); |
| if (the_trace_ != NULL) { |
| LOG(ERROR) << "Trace already in progress, ignoring this request"; |
| return; |
| } |
| } |
| Runtime* runtime = Runtime::Current(); |
| runtime->GetThreadList()->SuspendAll(); |
| |
| // Open trace file if not going directly to ddms. |
| std::unique_ptr<File> trace_file; |
| if (!direct_to_ddms) { |
| if (trace_fd < 0) { |
| trace_file.reset(OS::CreateEmptyFile(trace_filename)); |
| } else { |
| trace_file.reset(new File(trace_fd, "tracefile")); |
| trace_file->DisableAutoClose(); |
| } |
| if (trace_file.get() == NULL) { |
| PLOG(ERROR) << "Unable to open trace file '" << trace_filename << "'"; |
| runtime->GetThreadList()->ResumeAll(); |
| ScopedObjectAccess soa(self); |
| ThrowRuntimeException("Unable to open trace file '%s'", trace_filename); |
| return; |
| } |
| } |
| |
| // Create Trace object. |
| { |
| MutexLock mu(self, *Locks::trace_lock_); |
| if (the_trace_ != NULL) { |
| LOG(ERROR) << "Trace already in progress, ignoring this request"; |
| } else { |
| the_trace_ = new Trace(trace_file.release(), buffer_size, flags, sampling_enabled); |
| |
| // Enable count of allocs if specified in the flags. |
| if ((flags && kTraceCountAllocs) != 0) { |
| runtime->SetStatsEnabled(true); |
| } |
| |
| |
| |
| if (sampling_enabled) { |
| CHECK_PTHREAD_CALL(pthread_create, (&sampling_pthread_, NULL, &RunSamplingThread, |
| reinterpret_cast<void*>(interval_us)), |
| "Sampling profiler thread"); |
| } else { |
| runtime->GetInstrumentation()->AddListener(the_trace_, |
| instrumentation::Instrumentation::kMethodEntered | |
| instrumentation::Instrumentation::kMethodExited | |
| instrumentation::Instrumentation::kMethodUnwind); |
| runtime->GetInstrumentation()->EnableMethodTracing(); |
| } |
| } |
| } |
| runtime->GetThreadList()->ResumeAll(); |
| } |
| |
| void Trace::Stop() { |
| Runtime* runtime = Runtime::Current(); |
| runtime->GetThreadList()->SuspendAll(); |
| Trace* the_trace = NULL; |
| pthread_t sampling_pthread = 0U; |
| { |
| MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
| if (the_trace_ == NULL) { |
| LOG(ERROR) << "Trace stop requested, but no trace currently running"; |
| } else { |
| the_trace = the_trace_; |
| the_trace_ = NULL; |
| sampling_pthread = sampling_pthread_; |
| sampling_pthread_ = 0U; |
| } |
| } |
| if (the_trace != NULL) { |
| the_trace->FinishTracing(); |
| |
| if (the_trace->sampling_enabled_) { |
| MutexLock mu(Thread::Current(), *Locks::thread_list_lock_); |
| runtime->GetThreadList()->ForEach(ClearThreadStackTraceAndClockBase, NULL); |
| } else { |
| runtime->GetInstrumentation()->DisableMethodTracing(); |
| runtime->GetInstrumentation()->RemoveListener(the_trace, |
| instrumentation::Instrumentation::kMethodEntered | |
| instrumentation::Instrumentation::kMethodExited | |
| instrumentation::Instrumentation::kMethodUnwind); |
| } |
| delete the_trace; |
| } |
| runtime->GetThreadList()->ResumeAll(); |
| |
| if (sampling_pthread != 0U) { |
| CHECK_PTHREAD_CALL(pthread_join, (sampling_pthread, NULL), "sampling thread shutdown"); |
| } |
| } |
| |
| void Trace::Shutdown() { |
| if (GetMethodTracingMode() != kTracingInactive) { |
| Stop(); |
| } |
| } |
| |
| TracingMode Trace::GetMethodTracingMode() { |
| MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
| if (the_trace_ == NULL) { |
| return kTracingInactive; |
| } else if (the_trace_->sampling_enabled_) { |
| return kSampleProfilingActive; |
| } else { |
| return kMethodTracingActive; |
| } |
| } |
| |
| Trace::Trace(File* trace_file, int buffer_size, int flags, bool sampling_enabled) |
| : trace_file_(trace_file), buf_(new uint8_t[buffer_size]()), flags_(flags), |
| sampling_enabled_(sampling_enabled), clock_source_(default_clock_source_), |
| buffer_size_(buffer_size), start_time_(MicroTime()), cur_offset_(0), overflow_(false) { |
| // Set up the beginning of the trace. |
| uint16_t trace_version = GetTraceVersion(clock_source_); |
| memset(buf_.get(), 0, kTraceHeaderLength); |
| Append4LE(buf_.get(), kTraceMagicValue); |
| Append2LE(buf_.get() + 4, trace_version); |
| Append2LE(buf_.get() + 6, kTraceHeaderLength); |
| Append8LE(buf_.get() + 8, start_time_); |
| if (trace_version >= kTraceVersionDualClock) { |
| uint16_t record_size = GetRecordSize(clock_source_); |
| Append2LE(buf_.get() + 16, record_size); |
| } |
| |
| // Update current offset. |
| cur_offset_.StoreRelaxed(kTraceHeaderLength); |
| } |
| |
| static void DumpBuf(uint8_t* buf, size_t buf_size, TraceClockSource clock_source) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| uint8_t* ptr = buf + kTraceHeaderLength; |
| uint8_t* end = buf + buf_size; |
| |
| while (ptr < end) { |
| uint32_t tmid = ptr[2] | (ptr[3] << 8) | (ptr[4] << 16) | (ptr[5] << 24); |
| mirror::ArtMethod* method = DecodeTraceMethodId(tmid); |
| TraceAction action = DecodeTraceAction(tmid); |
| LOG(INFO) << PrettyMethod(method) << " " << static_cast<int>(action); |
| ptr += GetRecordSize(clock_source); |
| } |
| } |
| |
| void Trace::FinishTracing() { |
| // Compute elapsed time. |
| uint64_t elapsed = MicroTime() - start_time_; |
| |
| size_t final_offset = cur_offset_.LoadRelaxed(); |
| uint32_t clock_overhead_ns = GetClockOverheadNanoSeconds(this); |
| |
| if ((flags_ & kTraceCountAllocs) != 0) { |
| Runtime::Current()->SetStatsEnabled(false); |
| } |
| |
| std::set<mirror::ArtMethod*> visited_methods; |
| GetVisitedMethods(final_offset, &visited_methods); |
| |
| std::ostringstream os; |
| |
| os << StringPrintf("%cversion\n", kTraceTokenChar); |
| os << StringPrintf("%d\n", GetTraceVersion(clock_source_)); |
| os << StringPrintf("data-file-overflow=%s\n", overflow_ ? "true" : "false"); |
| if (UseThreadCpuClock()) { |
| if (UseWallClock()) { |
| os << StringPrintf("clock=dual\n"); |
| } else { |
| os << StringPrintf("clock=thread-cpu\n"); |
| } |
| } else { |
| os << StringPrintf("clock=wall\n"); |
| } |
| os << StringPrintf("elapsed-time-usec=%" PRIu64 "\n", elapsed); |
| size_t num_records = (final_offset - kTraceHeaderLength) / GetRecordSize(clock_source_); |
| os << StringPrintf("num-method-calls=%zd\n", num_records); |
| os << StringPrintf("clock-call-overhead-nsec=%d\n", clock_overhead_ns); |
| os << StringPrintf("vm=art\n"); |
| if ((flags_ & kTraceCountAllocs) != 0) { |
| os << StringPrintf("alloc-count=%d\n", Runtime::Current()->GetStat(KIND_ALLOCATED_OBJECTS)); |
| os << StringPrintf("alloc-size=%d\n", Runtime::Current()->GetStat(KIND_ALLOCATED_BYTES)); |
| os << StringPrintf("gc-count=%d\n", Runtime::Current()->GetStat(KIND_GC_INVOCATIONS)); |
| } |
| os << StringPrintf("%cthreads\n", kTraceTokenChar); |
| DumpThreadList(os); |
| os << StringPrintf("%cmethods\n", kTraceTokenChar); |
| DumpMethodList(os, visited_methods); |
| os << StringPrintf("%cend\n", kTraceTokenChar); |
| |
| std::string header(os.str()); |
| if (trace_file_.get() == NULL) { |
| iovec iov[2]; |
| iov[0].iov_base = reinterpret_cast<void*>(const_cast<char*>(header.c_str())); |
| iov[0].iov_len = header.length(); |
| iov[1].iov_base = buf_.get(); |
| iov[1].iov_len = final_offset; |
| Dbg::DdmSendChunkV(CHUNK_TYPE("MPSE"), iov, 2); |
| const bool kDumpTraceInfo = false; |
| if (kDumpTraceInfo) { |
| LOG(INFO) << "Trace sent:\n" << header; |
| DumpBuf(buf_.get(), final_offset, clock_source_); |
| } |
| } else { |
| if (!trace_file_->WriteFully(header.c_str(), header.length()) || |
| !trace_file_->WriteFully(buf_.get(), final_offset)) { |
| std::string detail(StringPrintf("Trace data write failed: %s", strerror(errno))); |
| PLOG(ERROR) << detail; |
| ThrowRuntimeException("%s", detail.c_str()); |
| } |
| } |
| } |
| |
| void Trace::DexPcMoved(Thread* thread, mirror::Object* this_object, |
| mirror::ArtMethod* method, uint32_t new_dex_pc) { |
| // We're not recorded to listen to this kind of event, so complain. |
| LOG(ERROR) << "Unexpected dex PC event in tracing " << PrettyMethod(method) << " " << new_dex_pc; |
| }; |
| |
| void Trace::FieldRead(Thread* /*thread*/, mirror::Object* this_object, |
| mirror::ArtMethod* method, uint32_t dex_pc, mirror::ArtField* field) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| // We're not recorded to listen to this kind of event, so complain. |
| LOG(ERROR) << "Unexpected field read event in tracing " << PrettyMethod(method) << " " << dex_pc; |
| } |
| |
| void Trace::FieldWritten(Thread* /*thread*/, mirror::Object* this_object, |
| mirror::ArtMethod* method, uint32_t dex_pc, mirror::ArtField* field, |
| const JValue& field_value) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| // We're not recorded to listen to this kind of event, so complain. |
| LOG(ERROR) << "Unexpected field write event in tracing " << PrettyMethod(method) << " " << dex_pc; |
| } |
| |
| void Trace::MethodEntered(Thread* thread, mirror::Object* this_object, |
| mirror::ArtMethod* method, uint32_t dex_pc) { |
| uint32_t thread_clock_diff = 0; |
| uint32_t wall_clock_diff = 0; |
| ReadClocks(thread, &thread_clock_diff, &wall_clock_diff); |
| LogMethodTraceEvent(thread, method, instrumentation::Instrumentation::kMethodEntered, |
| thread_clock_diff, wall_clock_diff); |
| } |
| |
| void Trace::MethodExited(Thread* thread, mirror::Object* this_object, |
| mirror::ArtMethod* method, uint32_t dex_pc, |
| const JValue& return_value) { |
| UNUSED(return_value); |
| uint32_t thread_clock_diff = 0; |
| uint32_t wall_clock_diff = 0; |
| ReadClocks(thread, &thread_clock_diff, &wall_clock_diff); |
| LogMethodTraceEvent(thread, method, instrumentation::Instrumentation::kMethodExited, |
| thread_clock_diff, wall_clock_diff); |
| } |
| |
| void Trace::MethodUnwind(Thread* thread, mirror::Object* this_object, |
| mirror::ArtMethod* method, uint32_t dex_pc) { |
| uint32_t thread_clock_diff = 0; |
| uint32_t wall_clock_diff = 0; |
| ReadClocks(thread, &thread_clock_diff, &wall_clock_diff); |
| LogMethodTraceEvent(thread, method, instrumentation::Instrumentation::kMethodUnwind, |
| thread_clock_diff, wall_clock_diff); |
| } |
| |
| void Trace::ExceptionCaught(Thread* thread, const ThrowLocation& throw_location, |
| mirror::ArtMethod* catch_method, uint32_t catch_dex_pc, |
| mirror::Throwable* exception_object) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| LOG(ERROR) << "Unexpected exception caught event in tracing"; |
| } |
| |
| void Trace::ReadClocks(Thread* thread, uint32_t* thread_clock_diff, uint32_t* wall_clock_diff) { |
| if (UseThreadCpuClock()) { |
| uint64_t clock_base = thread->GetTraceClockBase(); |
| if (UNLIKELY(clock_base == 0)) { |
| // First event, record the base time in the map. |
| uint64_t time = thread->GetCpuMicroTime(); |
| thread->SetTraceClockBase(time); |
| } else { |
| *thread_clock_diff = thread->GetCpuMicroTime() - clock_base; |
| } |
| } |
| if (UseWallClock()) { |
| *wall_clock_diff = MicroTime() - start_time_; |
| } |
| } |
| |
| void Trace::LogMethodTraceEvent(Thread* thread, mirror::ArtMethod* method, |
| instrumentation::Instrumentation::InstrumentationEvent event, |
| uint32_t thread_clock_diff, uint32_t wall_clock_diff) { |
| // Advance cur_offset_ atomically. |
| int32_t new_offset; |
| int32_t old_offset; |
| do { |
| old_offset = cur_offset_.LoadRelaxed(); |
| new_offset = old_offset + GetRecordSize(clock_source_); |
| if (new_offset > buffer_size_) { |
| overflow_ = true; |
| return; |
| } |
| } while (!cur_offset_.CompareExchangeWeakSequentiallyConsistent(old_offset, new_offset)); |
| |
| TraceAction action = kTraceMethodEnter; |
| switch (event) { |
| case instrumentation::Instrumentation::kMethodEntered: |
| action = kTraceMethodEnter; |
| break; |
| case instrumentation::Instrumentation::kMethodExited: |
| action = kTraceMethodExit; |
| break; |
| case instrumentation::Instrumentation::kMethodUnwind: |
| action = kTraceUnroll; |
| break; |
| default: |
| UNIMPLEMENTED(FATAL) << "Unexpected event: " << event; |
| } |
| |
| uint32_t method_value = EncodeTraceMethodAndAction(method, action); |
| |
| // Write data |
| uint8_t* ptr = buf_.get() + old_offset; |
| Append2LE(ptr, thread->GetTid()); |
| Append4LE(ptr + 2, method_value); |
| ptr += 6; |
| |
| if (UseThreadCpuClock()) { |
| Append4LE(ptr, thread_clock_diff); |
| ptr += 4; |
| } |
| if (UseWallClock()) { |
| Append4LE(ptr, wall_clock_diff); |
| } |
| } |
| |
| void Trace::GetVisitedMethods(size_t buf_size, |
| std::set<mirror::ArtMethod*>* visited_methods) { |
| uint8_t* ptr = buf_.get() + kTraceHeaderLength; |
| uint8_t* end = buf_.get() + buf_size; |
| |
| while (ptr < end) { |
| uint32_t tmid = ptr[2] | (ptr[3] << 8) | (ptr[4] << 16) | (ptr[5] << 24); |
| mirror::ArtMethod* method = DecodeTraceMethodId(tmid); |
| visited_methods->insert(method); |
| ptr += GetRecordSize(clock_source_); |
| } |
| } |
| |
| void Trace::DumpMethodList(std::ostream& os, const std::set<mirror::ArtMethod*>& visited_methods) { |
| for (const auto& method : visited_methods) { |
| os << StringPrintf("%p\t%s\t%s\t%s\t%s\n", method, |
| PrettyDescriptor(method->GetDeclaringClassDescriptor()).c_str(), method->GetName(), |
| method->GetSignature().ToString().c_str(), method->GetDeclaringClassSourceFile()); |
| } |
| } |
| |
| static void DumpThread(Thread* t, void* arg) { |
| std::ostream& os = *reinterpret_cast<std::ostream*>(arg); |
| std::string name; |
| t->GetThreadName(name); |
| os << t->GetTid() << "\t" << name << "\n"; |
| } |
| |
| void Trace::DumpThreadList(std::ostream& os) { |
| Thread* self = Thread::Current(); |
| Locks::thread_list_lock_->AssertNotHeld(self); |
| MutexLock mu(self, *Locks::thread_list_lock_); |
| Runtime::Current()->GetThreadList()->ForEach(DumpThread, &os); |
| } |
| |
| } // namespace art |