| // Copyright 2006-2008 Google Inc. All Rights Reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include <stdarg.h> |
| |
| #include "v8.h" |
| |
| #include "log.h" |
| #include "platform.h" |
| |
| namespace v8 { namespace internal { |
| |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| |
| // |
| // Command line flags used by Logger. |
| // |
| DEFINE_bool(log, false, |
| "Minimal logging (no API, code, GC, suspect, or handles samples)."); |
| DEFINE_bool(log_all, false, "Log all events to the log file."); |
| DEFINE_bool(log_api, false, "Log API events to the log file."); |
| DEFINE_bool(log_code, false, |
| "Log code events to the log file without profiling."); |
| DEFINE_bool(log_gc, false, |
| "Log heap samples on garbage collection for the hp2ps tool."); |
| DEFINE_bool(log_suspect, false, "Log suspect operations."); |
| DEFINE_bool(log_handles, false, "Log global handle events."); |
| DEFINE_bool(log_state_changes, false, "Log state changes."); |
| DEFINE_bool(prof, false, |
| "Log statistical profiling information (implies --log-code)."); |
| DEFINE_bool(sliding_state_window, false, |
| "Update sliding state window counters."); |
| |
| DEFINE_string(logfile, "v8.log", "Specify the name of the log file."); |
| |
| |
| // |
| // Sliding state window. Updates counters to keep track of the last |
| // window of kBufferSize states. This is useful to track where we |
| // spent our time. |
| // |
| class SlidingStateWindow { |
| public: |
| SlidingStateWindow(); |
| ~SlidingStateWindow(); |
| void AddState(StateTag state); |
| |
| private: |
| static const int kBufferSize = 256; |
| int current_index_; |
| bool is_full_; |
| byte buffer_[kBufferSize]; |
| |
| |
| void IncrementStateCounter(StateTag state) { |
| Counters::state_counters[state].Increment(); |
| } |
| |
| |
| void DecrementStateCounter(StateTag state) { |
| Counters::state_counters[state].Decrement(); |
| } |
| }; |
| |
| |
| // |
| // The Profiler samples pc and sp values for the main thread. |
| // Each sample is appended to a circular buffer. |
| // An independent thread removes data and writes it to the log. |
| // This design minimizes the time spent in the sampler. |
| // |
| class Profiler: public Thread { |
| public: |
| Profiler(); |
| void Engage(); |
| void Disengage(); |
| |
| // Inserts collected profiling data into buffer. |
| void Insert(TickSample* sample) { |
| if (Succ(head_) == tail_) { |
| overflow_ = true; |
| } else { |
| buffer_[head_] = *sample; |
| head_ = Succ(head_); |
| buffer_semaphore_->Signal(); // Tell we have an element. |
| } |
| } |
| |
| // Waits for a signal and removes profiling data. |
| bool Remove(TickSample* sample) { |
| buffer_semaphore_->Wait(); // Wait for an element. |
| *sample = buffer_[tail_]; |
| bool result = overflow_; |
| tail_ = Succ(tail_); |
| overflow_ = false; |
| return result; |
| } |
| |
| void Run(); |
| |
| private: |
| // Returns the next index in the cyclic buffer. |
| int Succ(int index) { return (index + 1) % kBufferSize; } |
| |
| // Cyclic buffer for communicating profiling samples |
| // between the signal handler and the worker thread. |
| static const int kBufferSize = 128; |
| TickSample buffer_[kBufferSize]; // Buffer storage. |
| int head_; // Index to the buffer head. |
| int tail_; // Index to the buffer tail. |
| bool overflow_; // Tell whether a buffer overflow has occurred. |
| Semaphore* buffer_semaphore_; // Sempahore used for buffer synchronization. |
| |
| // Tells whether worker thread should continue running. |
| bool running_; |
| }; |
| |
| |
| // |
| // Ticker used to provide ticks to the profiler and the sliding state |
| // window. |
| // |
| class Ticker: public ProfileSampler { |
| public: |
| explicit Ticker(int interval): |
| ProfileSampler(interval), window_(NULL), profiler_(NULL) {} |
| |
| ~Ticker() { if (IsActive()) Stop(); } |
| |
| void Tick(TickSample* sample) { |
| if (profiler_) profiler_->Insert(sample); |
| if (window_) window_->AddState(Logger::state()); |
| } |
| |
| void SetWindow(SlidingStateWindow* window) { |
| window_ = window; |
| if (!IsActive()) Start(); |
| } |
| |
| void ClearWindow() { |
| window_ = NULL; |
| if (!profiler_ && IsActive()) Stop(); |
| } |
| |
| void SetProfiler(Profiler* profiler) { |
| profiler_ = profiler; |
| if (!IsActive()) Start(); |
| } |
| |
| void ClearProfiler() { |
| profiler_ = NULL; |
| if (!window_ && IsActive()) Stop(); |
| } |
| |
| private: |
| SlidingStateWindow* window_; |
| Profiler* profiler_; |
| }; |
| |
| |
| // |
| // SlidingStateWindow implementation. |
| // |
| SlidingStateWindow::SlidingStateWindow(): current_index_(0), is_full_(false) { |
| for (int i = 0; i < kBufferSize; i++) { |
| buffer_[i] = static_cast<byte>(OTHER); |
| } |
| Logger::ticker_->SetWindow(this); |
| } |
| |
| |
| SlidingStateWindow::~SlidingStateWindow() { |
| Logger::ticker_->ClearWindow(); |
| } |
| |
| |
| void SlidingStateWindow::AddState(StateTag state) { |
| if (is_full_) { |
| DecrementStateCounter(static_cast<StateTag>(buffer_[current_index_])); |
| } else if (current_index_ == kBufferSize - 1) { |
| is_full_ = true; |
| } |
| buffer_[current_index_] = static_cast<byte>(state); |
| IncrementStateCounter(state); |
| ASSERT(IsPowerOf2(kBufferSize)); |
| current_index_ = (current_index_ + 1) & (kBufferSize - 1); |
| } |
| |
| |
| // |
| // Profiler implementation. |
| // |
| Profiler::Profiler() { |
| buffer_semaphore_ = OS::CreateSemaphore(0); |
| head_ = 0; |
| tail_ = 0; |
| overflow_ = false; |
| running_ = false; |
| } |
| |
| |
| void Profiler::Engage() { |
| OS::LogSharedLibraryAddresses(); |
| |
| // Start thread processing the profiler buffer. |
| running_ = true; |
| Start(); |
| |
| // Register to get ticks. |
| Logger::ticker_->SetProfiler(this); |
| |
| LOG(StringEvent("profiler", "begin")); |
| } |
| |
| |
| void Profiler::Disengage() { |
| // Stop receiving ticks. |
| Logger::ticker_->ClearProfiler(); |
| |
| // Terminate the worker thread by setting running_ to false, |
| // inserting a fake element in the queue and then wait for |
| // the thread to terminate. |
| running_ = false; |
| TickSample sample; |
| sample.pc = 0; |
| sample.sp = 0; |
| sample.state = OTHER; |
| Insert(&sample); |
| Join(); |
| |
| LOG(StringEvent("profiler", "end")); |
| } |
| |
| |
| void Profiler::Run() { |
| TickSample sample; |
| bool overflow = Logger::profiler_->Remove(&sample); |
| while (running_) { |
| LOG(TickEvent(&sample, overflow)); |
| overflow = Logger::profiler_->Remove(&sample); |
| } |
| } |
| |
| |
| // |
| // Synchronize class used for ensuring block structured |
| // locking for the Logger::*Event functions. |
| // |
| |
| class Synchronize { |
| public: |
| explicit Synchronize(Mutex* mutex) { |
| mutex_ = mutex; |
| mutex_->Lock(); |
| } |
| ~Synchronize() { |
| mutex_->Unlock(); |
| } |
| private: |
| // Mutex used for enforcing block structured access. |
| Mutex* mutex_; |
| }; |
| |
| |
| // |
| // Logger class implementation. |
| // |
| Ticker* Logger::ticker_ = NULL; |
| FILE* Logger::logfile_ = NULL; |
| Profiler* Logger::profiler_ = NULL; |
| Mutex* Logger::mutex_ = NULL; |
| VMState* Logger::current_state_ = NULL; |
| SlidingStateWindow* Logger::sliding_state_window_ = NULL; |
| |
| #endif // ENABLE_LOGGING_AND_PROFILING |
| |
| void Logger::Preamble(const char* content) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "%s", content); |
| #endif |
| } |
| |
| |
| void Logger::StringEvent(const char* name, const char* value) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "%s,\"%s\"\n", name, value); |
| #endif |
| } |
| |
| |
| void Logger::IntEvent(const char* name, int value) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "%s,%d\n", name, value); |
| #endif |
| } |
| |
| |
| void Logger::HandleEvent(const char* name, Object** location) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_handles) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "%s,0x%x\n", name, |
| reinterpret_cast<unsigned int>(location)); |
| #endif |
| } |
| |
| |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| // ApiEvent is private so all the calls come from the Logger class. It is the |
| // caller's responsibility to ensure that logfile_ is not NULL and that |
| // FLAG_log_api is true. |
| void Logger::ApiEvent(const char* format, ...) { |
| ASSERT(logfile_ != NULL && FLAG_log_api); |
| Synchronize s(mutex_); |
| va_list ap; |
| va_start(ap, format); |
| vfprintf(logfile_, format, ap); |
| } |
| #endif |
| |
| |
| void Logger::ApiNamedSecurityCheck(Object* key) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_api) return; |
| if (key->IsString()) { |
| SmartPointer<char> str = |
| String::cast(key)->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL); |
| ApiEvent("api,check-security,\"%s\"\n", *str); |
| } else if (key->IsUndefined()) { |
| ApiEvent("api,check-security,undefined\n"); |
| } else { |
| ApiEvent("api,check-security,['no-name']\n"); |
| } |
| #endif |
| } |
| |
| |
| void Logger::SharedLibraryEvent(const char* library_path, |
| unsigned start, |
| unsigned end) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_prof) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "shared-library,\"%s\",0x%08x,0x%08x\n", library_path, |
| start, end); |
| #endif |
| } |
| |
| |
| void Logger::SharedLibraryEvent(const wchar_t* library_path, |
| unsigned start, |
| unsigned end) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_prof) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "shared-library,\"%ls\",0x%08x,0x%08x\n", library_path, |
| start, end); |
| #endif |
| } |
| |
| void Logger::ApiIndexedSecurityCheck(uint32_t index) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_api) return; |
| ApiEvent("api,check-security,%u\n", index); |
| #endif |
| } |
| |
| |
| void Logger::ApiNamedPropertyAccess(const char* tag, |
| JSObject* holder, |
| Object* name) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| ASSERT(name->IsString()); |
| if (logfile_ == NULL || !FLAG_log_api) return; |
| String* class_name_obj = holder->class_name(); |
| SmartPointer<char> class_name = |
| class_name_obj->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL); |
| SmartPointer<char> property_name = |
| String::cast(name)->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL); |
| Logger::ApiEvent("api,%s,\"%s\",\"%s\"\n", tag, *class_name, *property_name); |
| #endif |
| } |
| |
| void Logger::ApiIndexedPropertyAccess(const char* tag, |
| JSObject* holder, |
| uint32_t index) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_api) return; |
| String* class_name_obj = holder->class_name(); |
| SmartPointer<char> class_name = |
| class_name_obj->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL); |
| Logger::ApiEvent("api,%s,\"%s\",%u\n", tag, *class_name, index); |
| #endif |
| } |
| |
| void Logger::ApiObjectAccess(const char* tag, JSObject* object) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_api) return; |
| String* class_name_obj = object->class_name(); |
| SmartPointer<char> class_name = |
| class_name_obj->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL); |
| Logger::ApiEvent("api,%s,\"%s\"\n", tag, *class_name); |
| #endif |
| } |
| |
| |
| void Logger::ApiEntryCall(const char* name) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_api) return; |
| Logger::ApiEvent("api,%s\n", name); |
| #endif |
| } |
| |
| |
| void Logger::NewEvent(const char* name, void* object, size_t size) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "new,%s,0x%x,%u\n", name, |
| reinterpret_cast<unsigned int>(object), |
| static_cast<unsigned int>(size)); |
| #endif |
| } |
| |
| |
| void Logger::DeleteEvent(const char* name, void* object) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "delete,%s,0x%x\n", name, |
| reinterpret_cast<unsigned int>(object)); |
| #endif |
| } |
| |
| |
| void Logger::CodeCreateEvent(const char* tag, Code* code, const char* comment) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_code) return; |
| Synchronize s(mutex_); |
| |
| fprintf(logfile_, "code-creation,%s,0x%x,%d,\"", tag, |
| reinterpret_cast<unsigned int>(code->address()), |
| code->instruction_size()); |
| for (const char* p = comment; *p != '\0'; p++) { |
| if (*p == '\"') fprintf(logfile_, "\\"); |
| fprintf(logfile_, "%c", *p); |
| } |
| fprintf(logfile_, "\"\n"); |
| #endif |
| } |
| |
| |
| void Logger::CodeCreateEvent(const char* tag, Code* code, String* name) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_code) return; |
| Synchronize s(mutex_); |
| SmartPointer<char> str = |
| name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL); |
| fprintf(logfile_, "code-creation,%s,0x%x,%d,\"%s\"\n", tag, |
| reinterpret_cast<unsigned int>(code->address()), |
| code->instruction_size(), *str); |
| #endif |
| } |
| |
| |
| void Logger::CodeCreateEvent(const char* tag, Code* code, int args_count) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_code) return; |
| Synchronize s(mutex_); |
| |
| fprintf(logfile_, "code-creation,%s,0x%x,%d,\"args_count: %d\"\n", tag, |
| reinterpret_cast<unsigned int>(code->address()), |
| code->instruction_size(), |
| args_count); |
| #endif |
| } |
| |
| |
| void Logger::CodeMoveEvent(Address from, Address to) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_code) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "code-move,0x%x,0x%x\n", |
| reinterpret_cast<unsigned int>(from), |
| reinterpret_cast<unsigned int>(to)); |
| #endif |
| } |
| |
| |
| void Logger::CodeDeleteEvent(Address from) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_code) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "code-delete,0x%x\n", reinterpret_cast<unsigned int>(from)); |
| #endif |
| } |
| |
| |
| void Logger::ResourceEvent(const char* name, const char* tag) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "%s,%s,", name, tag); |
| |
| uint32_t sec, usec; |
| if (OS::GetUserTime(&sec, &usec) != -1) { |
| fprintf(logfile_, "%d,%d,", sec, usec); |
| } |
| fprintf(logfile_, "%.0f", OS::TimeCurrentMillis()); |
| |
| fprintf(logfile_, "\n"); |
| #endif |
| } |
| |
| |
| void Logger::SuspectReadEvent(String* name, String* obj) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_suspect) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "suspect-read,"); |
| obj->PrintOn(logfile_); |
| fprintf(logfile_, ",\""); |
| name->PrintOn(logfile_); |
| fprintf(logfile_, "\"\n"); |
| #endif |
| } |
| |
| |
| void Logger::HeapSampleBeginEvent(const char* space, const char* kind) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_gc) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "heap-sample-begin,\"%s\",\"%s\"\n", space, kind); |
| #endif |
| } |
| |
| |
| void Logger::HeapSampleEndEvent(const char* space, const char* kind) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_gc) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "heap-sample-end,\"%s\",\"%s\"\n", space, kind); |
| #endif |
| } |
| |
| |
| void Logger::HeapSampleItemEvent(const char* type, int number, int bytes) { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| if (logfile_ == NULL || !FLAG_log_gc) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "heap-sample-item,%s,%d,%d\n", type, number, bytes); |
| #endif |
| } |
| |
| |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| void Logger::TickEvent(TickSample* sample, bool overflow) { |
| if (logfile_ == NULL) return; |
| Synchronize s(mutex_); |
| fprintf(logfile_, "tick,0x%x,0x%x,%d", sample->pc, sample->sp, |
| static_cast<int>(sample->state)); |
| if (overflow) fprintf(logfile_, ",overflow"); |
| fprintf(logfile_, "\n"); |
| } |
| #endif |
| |
| |
| bool Logger::Setup() { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| // --log-all enables all the log flags. |
| if (FLAG_log_all) { |
| FLAG_log_api = true; |
| FLAG_log_code = true; |
| FLAG_log_gc = true; |
| FLAG_log_suspect = true; |
| FLAG_log_handles = true; |
| } |
| |
| // --prof implies --log-code. |
| if (FLAG_prof) FLAG_log_code = true; |
| |
| // Each of the individual log flags implies --log. Check after |
| // checking --log-all and --prof in case they set --log-code. |
| if (FLAG_log_api || FLAG_log_code || FLAG_log_gc || |
| FLAG_log_handles || FLAG_log_suspect) { |
| FLAG_log = true; |
| } |
| |
| // If we're logging anything, we need to open the log file. |
| if (FLAG_log) { |
| if (strcmp(FLAG_logfile, "-") == 0) { |
| logfile_ = stdout; |
| } else { |
| logfile_ = fopen(FLAG_logfile, "w"); |
| } |
| mutex_ = OS::CreateMutex(); |
| } |
| |
| current_state_ = new VMState(OTHER); |
| |
| ticker_ = new Ticker(10); |
| |
| if (FLAG_sliding_state_window && sliding_state_window_ == NULL) { |
| sliding_state_window_ = new SlidingStateWindow(); |
| } |
| |
| if (FLAG_prof) { |
| profiler_ = new Profiler(); |
| profiler_->Engage(); |
| } |
| |
| return true; |
| |
| #else |
| return false; |
| #endif |
| } |
| |
| |
| void Logger::TearDown() { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| // Stop the profiler before closing the file. |
| if (profiler_ != NULL) { |
| profiler_->Disengage(); |
| delete profiler_; |
| profiler_ = NULL; |
| } |
| |
| // Deleting the current_state_ has the side effect of assigning to it(!). |
| while (current_state_) delete current_state_; |
| delete sliding_state_window_; |
| |
| delete ticker_; |
| |
| if (logfile_ != NULL) { |
| fclose(logfile_); |
| logfile_ = NULL; |
| delete mutex_; |
| mutex_ = NULL; |
| } |
| #endif |
| } |
| |
| |
| void Logger::EnableSlidingStateWindow() { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| // If the ticker is NULL, Logger::Setup has not been called yet. In |
| // that case, we set the sliding_state_window flag so that the |
| // sliding window computation will be started when Logger::Setup is |
| // called. |
| if (ticker_ == NULL) { |
| FLAG_sliding_state_window = true; |
| return; |
| } |
| // Otherwise, if the sliding state window computation has not been |
| // started we do it now. |
| if (sliding_state_window_ == NULL) { |
| sliding_state_window_ = new SlidingStateWindow(); |
| } |
| #endif |
| } |
| |
| |
| // |
| // VMState class implementation. A simple stack of VM states held by the |
| // logger and partially threaded through the call stack. States are pushed by |
| // VMState construction and popped by destruction. |
| // |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| static const char* StateToString(StateTag state) { |
| switch (state) { |
| case GC: |
| return "GC"; |
| case COMPILER: |
| return "COMPILER"; |
| case OTHER: |
| return "OTHER"; |
| default: |
| UNREACHABLE(); |
| return NULL; |
| } |
| } |
| |
| VMState::VMState(StateTag state) { |
| state_ = state; |
| previous_ = Logger::current_state_; |
| Logger::current_state_ = this; |
| |
| if (FLAG_log_state_changes) { |
| LOG(StringEvent("Entering", StateToString(state_))); |
| if (previous_) { |
| LOG(StringEvent("From", StateToString(previous_->state_))); |
| } |
| } |
| } |
| |
| |
| VMState::~VMState() { |
| Logger::current_state_ = previous_; |
| |
| if (FLAG_log_state_changes) { |
| LOG(StringEvent("Leaving", StateToString(state_))); |
| if (previous_) { |
| LOG(StringEvent("To", StateToString(previous_->state_))); |
| } |
| } |
| } |
| #endif |
| |
| } } // namespace v8::internal |