| // Copyright 2006-2008 the V8 project authors. 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. |
| |
| // Platform specific code for FreeBSD goes here. For the POSIX comaptible parts |
| // the implementation is in platform-posix.cc. |
| |
| #include <pthread.h> |
| #include <semaphore.h> |
| #include <signal.h> |
| #include <sys/time.h> |
| #include <sys/resource.h> |
| #include <sys/types.h> |
| #include <sys/ucontext.h> |
| #include <stdlib.h> |
| |
| #include <sys/types.h> // mmap & munmap |
| #include <sys/mman.h> // mmap & munmap |
| #include <sys/stat.h> // open |
| #include <sys/fcntl.h> // open |
| #include <unistd.h> // getpagesize |
| // If you don't have execinfo.h then you need devel/libexecinfo from ports. |
| #include <execinfo.h> // backtrace, backtrace_symbols |
| #include <strings.h> // index |
| #include <errno.h> |
| #include <stdarg.h> |
| #include <limits.h> |
| |
| #undef MAP_TYPE |
| |
| #include "v8.h" |
| |
| #include "platform.h" |
| #include "vm-state-inl.h" |
| |
| |
| namespace v8 { |
| namespace internal { |
| |
| // 0 is never a valid thread id on FreeBSD since tids and pids share a |
| // name space and pid 0 is used to kill the group (see man 2 kill). |
| static const pthread_t kNoThread = (pthread_t) 0; |
| |
| |
| double ceiling(double x) { |
| // Correct as on OS X |
| if (-1.0 < x && x < 0.0) { |
| return -0.0; |
| } else { |
| return ceil(x); |
| } |
| } |
| |
| |
| static Mutex* limit_mutex = NULL; |
| |
| |
| void OS::Setup() { |
| // Seed the random number generator. |
| // Convert the current time to a 64-bit integer first, before converting it |
| // to an unsigned. Going directly can cause an overflow and the seed to be |
| // set to all ones. The seed will be identical for different instances that |
| // call this setup code within the same millisecond. |
| uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); |
| srandom(static_cast<unsigned int>(seed)); |
| limit_mutex = CreateMutex(); |
| } |
| |
| |
| void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) { |
| __asm__ __volatile__("" : : : "memory"); |
| *ptr = value; |
| } |
| |
| |
| uint64_t OS::CpuFeaturesImpliedByPlatform() { |
| return 0; // FreeBSD runs on anything. |
| } |
| |
| |
| int OS::ActivationFrameAlignment() { |
| // 16 byte alignment on FreeBSD |
| return 16; |
| } |
| |
| |
| const char* OS::LocalTimezone(double time) { |
| if (isnan(time)) return ""; |
| time_t tv = static_cast<time_t>(floor(time/msPerSecond)); |
| struct tm* t = localtime(&tv); |
| if (NULL == t) return ""; |
| return t->tm_zone; |
| } |
| |
| |
| double OS::LocalTimeOffset() { |
| time_t tv = time(NULL); |
| struct tm* t = localtime(&tv); |
| // tm_gmtoff includes any daylight savings offset, so subtract it. |
| return static_cast<double>(t->tm_gmtoff * msPerSecond - |
| (t->tm_isdst > 0 ? 3600 * msPerSecond : 0)); |
| } |
| |
| |
| // We keep the lowest and highest addresses mapped as a quick way of |
| // determining that pointers are outside the heap (used mostly in assertions |
| // and verification). The estimate is conservative, ie, not all addresses in |
| // 'allocated' space are actually allocated to our heap. The range is |
| // [lowest, highest), inclusive on the low and and exclusive on the high end. |
| static void* lowest_ever_allocated = reinterpret_cast<void*>(-1); |
| static void* highest_ever_allocated = reinterpret_cast<void*>(0); |
| |
| |
| static void UpdateAllocatedSpaceLimits(void* address, int size) { |
| ASSERT(limit_mutex != NULL); |
| ScopedLock lock(limit_mutex); |
| |
| lowest_ever_allocated = Min(lowest_ever_allocated, address); |
| highest_ever_allocated = |
| Max(highest_ever_allocated, |
| reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size)); |
| } |
| |
| |
| bool OS::IsOutsideAllocatedSpace(void* address) { |
| return address < lowest_ever_allocated || address >= highest_ever_allocated; |
| } |
| |
| |
| size_t OS::AllocateAlignment() { |
| return getpagesize(); |
| } |
| |
| |
| void* OS::Allocate(const size_t requested, |
| size_t* allocated, |
| bool executable) { |
| const size_t msize = RoundUp(requested, getpagesize()); |
| int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0); |
| void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0); |
| |
| if (mbase == MAP_FAILED) { |
| LOG(ISOLATE, StringEvent("OS::Allocate", "mmap failed")); |
| return NULL; |
| } |
| *allocated = msize; |
| UpdateAllocatedSpaceLimits(mbase, msize); |
| return mbase; |
| } |
| |
| |
| void OS::Free(void* buf, const size_t length) { |
| // TODO(1240712): munmap has a return value which is ignored here. |
| int result = munmap(buf, length); |
| USE(result); |
| ASSERT(result == 0); |
| } |
| |
| |
| #ifdef ENABLE_HEAP_PROTECTION |
| |
| void OS::Protect(void* address, size_t size) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void OS::Unprotect(void* address, size_t size, bool is_executable) { |
| UNIMPLEMENTED(); |
| } |
| |
| #endif |
| |
| |
| void OS::Sleep(int milliseconds) { |
| unsigned int ms = static_cast<unsigned int>(milliseconds); |
| usleep(1000 * ms); |
| } |
| |
| |
| void OS::Abort() { |
| // Redirect to std abort to signal abnormal program termination. |
| abort(); |
| } |
| |
| |
| void OS::DebugBreak() { |
| #if (defined(__arm__) || defined(__thumb__)) |
| # if defined(CAN_USE_ARMV5_INSTRUCTIONS) |
| asm("bkpt 0"); |
| # endif |
| #else |
| asm("int $3"); |
| #endif |
| } |
| |
| |
| class PosixMemoryMappedFile : public OS::MemoryMappedFile { |
| public: |
| PosixMemoryMappedFile(FILE* file, void* memory, int size) |
| : file_(file), memory_(memory), size_(size) { } |
| virtual ~PosixMemoryMappedFile(); |
| virtual void* memory() { return memory_; } |
| virtual int size() { return size_; } |
| private: |
| FILE* file_; |
| void* memory_; |
| int size_; |
| }; |
| |
| |
| OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { |
| FILE* file = fopen(name, "r+"); |
| if (file == NULL) return NULL; |
| |
| fseek(file, 0, SEEK_END); |
| int size = ftell(file); |
| |
| void* memory = |
| mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| return new PosixMemoryMappedFile(file, memory, size); |
| } |
| |
| |
| OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, |
| void* initial) { |
| FILE* file = fopen(name, "w+"); |
| if (file == NULL) return NULL; |
| int result = fwrite(initial, size, 1, file); |
| if (result < 1) { |
| fclose(file); |
| return NULL; |
| } |
| void* memory = |
| mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| return new PosixMemoryMappedFile(file, memory, size); |
| } |
| |
| |
| PosixMemoryMappedFile::~PosixMemoryMappedFile() { |
| if (memory_) munmap(memory_, size_); |
| fclose(file_); |
| } |
| |
| |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| static unsigned StringToLong(char* buffer) { |
| return static_cast<unsigned>(strtol(buffer, NULL, 16)); // NOLINT |
| } |
| #endif |
| |
| |
| void OS::LogSharedLibraryAddresses() { |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| static const int MAP_LENGTH = 1024; |
| int fd = open("/proc/self/maps", O_RDONLY); |
| if (fd < 0) return; |
| while (true) { |
| char addr_buffer[11]; |
| addr_buffer[0] = '0'; |
| addr_buffer[1] = 'x'; |
| addr_buffer[10] = 0; |
| int result = read(fd, addr_buffer + 2, 8); |
| if (result < 8) break; |
| unsigned start = StringToLong(addr_buffer); |
| result = read(fd, addr_buffer + 2, 1); |
| if (result < 1) break; |
| if (addr_buffer[2] != '-') break; |
| result = read(fd, addr_buffer + 2, 8); |
| if (result < 8) break; |
| unsigned end = StringToLong(addr_buffer); |
| char buffer[MAP_LENGTH]; |
| int bytes_read = -1; |
| do { |
| bytes_read++; |
| if (bytes_read >= MAP_LENGTH - 1) |
| break; |
| result = read(fd, buffer + bytes_read, 1); |
| if (result < 1) break; |
| } while (buffer[bytes_read] != '\n'); |
| buffer[bytes_read] = 0; |
| // Ignore mappings that are not executable. |
| if (buffer[3] != 'x') continue; |
| char* start_of_path = index(buffer, '/'); |
| // There may be no filename in this line. Skip to next. |
| if (start_of_path == NULL) continue; |
| buffer[bytes_read] = 0; |
| LOG(i::Isolate::Current(), SharedLibraryEvent(start_of_path, start, end)); |
| } |
| close(fd); |
| #endif |
| } |
| |
| |
| void OS::SignalCodeMovingGC() { |
| } |
| |
| |
| int OS::StackWalk(Vector<OS::StackFrame> frames) { |
| int frames_size = frames.length(); |
| ScopedVector<void*> addresses(frames_size); |
| |
| int frames_count = backtrace(addresses.start(), frames_size); |
| |
| char** symbols = backtrace_symbols(addresses.start(), frames_count); |
| if (symbols == NULL) { |
| return kStackWalkError; |
| } |
| |
| for (int i = 0; i < frames_count; i++) { |
| frames[i].address = addresses[i]; |
| // Format a text representation of the frame based on the information |
| // available. |
| SNPrintF(MutableCStrVector(frames[i].text, kStackWalkMaxTextLen), |
| "%s", |
| symbols[i]); |
| // Make sure line termination is in place. |
| frames[i].text[kStackWalkMaxTextLen - 1] = '\0'; |
| } |
| |
| free(symbols); |
| |
| return frames_count; |
| } |
| |
| |
| // Constants used for mmap. |
| static const int kMmapFd = -1; |
| static const int kMmapFdOffset = 0; |
| |
| |
| VirtualMemory::VirtualMemory(size_t size) { |
| address_ = mmap(NULL, size, PROT_NONE, |
| MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, |
| kMmapFd, kMmapFdOffset); |
| size_ = size; |
| } |
| |
| |
| VirtualMemory::~VirtualMemory() { |
| if (IsReserved()) { |
| if (0 == munmap(address(), size())) address_ = MAP_FAILED; |
| } |
| } |
| |
| |
| bool VirtualMemory::IsReserved() { |
| return address_ != MAP_FAILED; |
| } |
| |
| |
| bool VirtualMemory::Commit(void* address, size_t size, bool executable) { |
| int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0); |
| if (MAP_FAILED == mmap(address, size, prot, |
| MAP_PRIVATE | MAP_ANON | MAP_FIXED, |
| kMmapFd, kMmapFdOffset)) { |
| return false; |
| } |
| |
| UpdateAllocatedSpaceLimits(address, size); |
| return true; |
| } |
| |
| |
| bool VirtualMemory::Uncommit(void* address, size_t size) { |
| return mmap(address, size, PROT_NONE, |
| MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_FIXED, |
| kMmapFd, kMmapFdOffset) != MAP_FAILED; |
| } |
| |
| |
| class ThreadHandle::PlatformData : public Malloced { |
| public: |
| explicit PlatformData(ThreadHandle::Kind kind) { |
| Initialize(kind); |
| } |
| |
| void Initialize(ThreadHandle::Kind kind) { |
| switch (kind) { |
| case ThreadHandle::SELF: thread_ = pthread_self(); break; |
| case ThreadHandle::INVALID: thread_ = kNoThread; break; |
| } |
| } |
| pthread_t thread_; // Thread handle for pthread. |
| }; |
| |
| |
| ThreadHandle::ThreadHandle(Kind kind) { |
| data_ = new PlatformData(kind); |
| } |
| |
| |
| void ThreadHandle::Initialize(ThreadHandle::Kind kind) { |
| data_->Initialize(kind); |
| } |
| |
| |
| ThreadHandle::~ThreadHandle() { |
| delete data_; |
| } |
| |
| |
| bool ThreadHandle::IsSelf() const { |
| return pthread_equal(data_->thread_, pthread_self()); |
| } |
| |
| |
| bool ThreadHandle::IsValid() const { |
| return data_->thread_ != kNoThread; |
| } |
| |
| |
| Thread::Thread(Isolate* isolate, const Options& options) |
| : ThreadHandle(ThreadHandle::INVALID), |
| isolate_(isolate), |
| stack_size_(options.stack_size) { |
| set_name(options.name); |
| } |
| |
| |
| Thread::Thread(Isolate* isolate, const char* name) |
| : ThreadHandle(ThreadHandle::INVALID), |
| isolate_(isolate), |
| stack_size_(0) { |
| set_name(name); |
| } |
| |
| |
| Thread::~Thread() { |
| } |
| |
| |
| static void* ThreadEntry(void* arg) { |
| Thread* thread = reinterpret_cast<Thread*>(arg); |
| // This is also initialized by the first argument to pthread_create() but we |
| // don't know which thread will run first (the original thread or the new |
| // one) so we initialize it here too. |
| thread->thread_handle_data()->thread_ = pthread_self(); |
| ASSERT(thread->IsValid()); |
| Thread::SetThreadLocal(Isolate::isolate_key(), thread->isolate()); |
| thread->Run(); |
| return NULL; |
| } |
| |
| |
| void Thread::set_name(const char* name) { |
| strncpy(name_, name, sizeof(name_)); |
| name_[sizeof(name_) - 1] = '\0'; |
| } |
| |
| |
| void Thread::Start() { |
| pthread_attr_t* attr_ptr = NULL; |
| pthread_attr_t attr; |
| if (stack_size_ > 0) { |
| pthread_attr_init(&attr); |
| pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_)); |
| attr_ptr = &attr; |
| } |
| pthread_create(&thread_handle_data()->thread_, attr_ptr, ThreadEntry, this); |
| ASSERT(IsValid()); |
| } |
| |
| |
| void Thread::Join() { |
| pthread_join(thread_handle_data()->thread_, NULL); |
| } |
| |
| |
| Thread::LocalStorageKey Thread::CreateThreadLocalKey() { |
| pthread_key_t key; |
| int result = pthread_key_create(&key, NULL); |
| USE(result); |
| ASSERT(result == 0); |
| return static_cast<LocalStorageKey>(key); |
| } |
| |
| |
| void Thread::DeleteThreadLocalKey(LocalStorageKey key) { |
| pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| int result = pthread_key_delete(pthread_key); |
| USE(result); |
| ASSERT(result == 0); |
| } |
| |
| |
| void* Thread::GetThreadLocal(LocalStorageKey key) { |
| pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| return pthread_getspecific(pthread_key); |
| } |
| |
| |
| void Thread::SetThreadLocal(LocalStorageKey key, void* value) { |
| pthread_key_t pthread_key = static_cast<pthread_key_t>(key); |
| pthread_setspecific(pthread_key, value); |
| } |
| |
| |
| void Thread::YieldCPU() { |
| sched_yield(); |
| } |
| |
| |
| class FreeBSDMutex : public Mutex { |
| public: |
| |
| FreeBSDMutex() { |
| pthread_mutexattr_t attrs; |
| int result = pthread_mutexattr_init(&attrs); |
| ASSERT(result == 0); |
| result = pthread_mutexattr_settype(&attrs, PTHREAD_MUTEX_RECURSIVE); |
| ASSERT(result == 0); |
| result = pthread_mutex_init(&mutex_, &attrs); |
| ASSERT(result == 0); |
| } |
| |
| virtual ~FreeBSDMutex() { pthread_mutex_destroy(&mutex_); } |
| |
| virtual int Lock() { |
| int result = pthread_mutex_lock(&mutex_); |
| return result; |
| } |
| |
| virtual int Unlock() { |
| int result = pthread_mutex_unlock(&mutex_); |
| return result; |
| } |
| |
| virtual bool TryLock() { |
| int result = pthread_mutex_trylock(&mutex_); |
| // Return false if the lock is busy and locking failed. |
| if (result == EBUSY) { |
| return false; |
| } |
| ASSERT(result == 0); // Verify no other errors. |
| return true; |
| } |
| |
| private: |
| pthread_mutex_t mutex_; // Pthread mutex for POSIX platforms. |
| }; |
| |
| |
| Mutex* OS::CreateMutex() { |
| return new FreeBSDMutex(); |
| } |
| |
| |
| class FreeBSDSemaphore : public Semaphore { |
| public: |
| explicit FreeBSDSemaphore(int count) { sem_init(&sem_, 0, count); } |
| virtual ~FreeBSDSemaphore() { sem_destroy(&sem_); } |
| |
| virtual void Wait(); |
| virtual bool Wait(int timeout); |
| virtual void Signal() { sem_post(&sem_); } |
| private: |
| sem_t sem_; |
| }; |
| |
| |
| void FreeBSDSemaphore::Wait() { |
| while (true) { |
| int result = sem_wait(&sem_); |
| if (result == 0) return; // Successfully got semaphore. |
| CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| } |
| } |
| |
| |
| bool FreeBSDSemaphore::Wait(int timeout) { |
| const long kOneSecondMicros = 1000000; // NOLINT |
| |
| // Split timeout into second and nanosecond parts. |
| struct timeval delta; |
| delta.tv_usec = timeout % kOneSecondMicros; |
| delta.tv_sec = timeout / kOneSecondMicros; |
| |
| struct timeval current_time; |
| // Get the current time. |
| if (gettimeofday(¤t_time, NULL) == -1) { |
| return false; |
| } |
| |
| // Calculate time for end of timeout. |
| struct timeval end_time; |
| timeradd(¤t_time, &delta, &end_time); |
| |
| struct timespec ts; |
| TIMEVAL_TO_TIMESPEC(&end_time, &ts); |
| while (true) { |
| int result = sem_timedwait(&sem_, &ts); |
| if (result == 0) return true; // Successfully got semaphore. |
| if (result == -1 && errno == ETIMEDOUT) return false; // Timeout. |
| CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. |
| } |
| } |
| |
| |
| Semaphore* OS::CreateSemaphore(int count) { |
| return new FreeBSDSemaphore(count); |
| } |
| |
| |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| |
| static pthread_t GetThreadID() { |
| pthread_t thread_id = pthread_self(); |
| return thread_id; |
| } |
| |
| |
| class Sampler::PlatformData : public Malloced { |
| public: |
| PlatformData() : vm_tid_(GetThreadID()) {} |
| |
| pthread_t vm_tid() const { return vm_tid_; } |
| |
| private: |
| pthread_t vm_tid_; |
| }; |
| |
| |
| static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) { |
| USE(info); |
| if (signal != SIGPROF) return; |
| Isolate* isolate = Isolate::UncheckedCurrent(); |
| if (isolate == NULL || !isolate->IsInitialized() || !isolate->IsInUse()) { |
| // We require a fully initialized and entered isolate. |
| return; |
| } |
| Sampler* sampler = isolate->logger()->sampler(); |
| if (sampler == NULL || !sampler->IsActive()) return; |
| |
| TickSample sample_obj; |
| TickSample* sample = CpuProfiler::TickSampleEvent(isolate); |
| if (sample == NULL) sample = &sample_obj; |
| |
| // Extracting the sample from the context is extremely machine dependent. |
| ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); |
| mcontext_t& mcontext = ucontext->uc_mcontext; |
| sample->state = isolate->current_vm_state(); |
| #if V8_HOST_ARCH_IA32 |
| sample->pc = reinterpret_cast<Address>(mcontext.mc_eip); |
| sample->sp = reinterpret_cast<Address>(mcontext.mc_esp); |
| sample->fp = reinterpret_cast<Address>(mcontext.mc_ebp); |
| #elif V8_HOST_ARCH_X64 |
| sample->pc = reinterpret_cast<Address>(mcontext.mc_rip); |
| sample->sp = reinterpret_cast<Address>(mcontext.mc_rsp); |
| sample->fp = reinterpret_cast<Address>(mcontext.mc_rbp); |
| #elif V8_HOST_ARCH_ARM |
| sample->pc = reinterpret_cast<Address>(mcontext.mc_r15); |
| sample->sp = reinterpret_cast<Address>(mcontext.mc_r13); |
| sample->fp = reinterpret_cast<Address>(mcontext.mc_r11); |
| #endif |
| sampler->SampleStack(sample); |
| sampler->Tick(sample); |
| } |
| |
| |
| class SignalSender : public Thread { |
| public: |
| enum SleepInterval { |
| HALF_INTERVAL, |
| FULL_INTERVAL |
| }; |
| |
| explicit SignalSender(int interval) |
| : Thread(NULL, "SignalSender"), |
| interval_(interval) {} |
| |
| static void AddActiveSampler(Sampler* sampler) { |
| ScopedLock lock(mutex_); |
| SamplerRegistry::AddActiveSampler(sampler); |
| if (instance_ == NULL) { |
| // Install a signal handler. |
| struct sigaction sa; |
| sa.sa_sigaction = ProfilerSignalHandler; |
| sigemptyset(&sa.sa_mask); |
| sa.sa_flags = SA_RESTART | SA_SIGINFO; |
| signal_handler_installed_ = |
| (sigaction(SIGPROF, &sa, &old_signal_handler_) == 0); |
| |
| // Start a thread that sends SIGPROF signal to VM threads. |
| instance_ = new SignalSender(sampler->interval()); |
| instance_->Start(); |
| } else { |
| ASSERT(instance_->interval_ == sampler->interval()); |
| } |
| } |
| |
| static void RemoveActiveSampler(Sampler* sampler) { |
| ScopedLock lock(mutex_); |
| SamplerRegistry::RemoveActiveSampler(sampler); |
| if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) { |
| RuntimeProfiler::WakeUpRuntimeProfilerThreadBeforeShutdown(); |
| instance_->Join(); |
| delete instance_; |
| instance_ = NULL; |
| |
| // Restore the old signal handler. |
| if (signal_handler_installed_) { |
| sigaction(SIGPROF, &old_signal_handler_, 0); |
| signal_handler_installed_ = false; |
| } |
| } |
| } |
| |
| // Implement Thread::Run(). |
| virtual void Run() { |
| SamplerRegistry::State state; |
| while ((state = SamplerRegistry::GetState()) != |
| SamplerRegistry::HAS_NO_SAMPLERS) { |
| bool cpu_profiling_enabled = |
| (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS); |
| bool runtime_profiler_enabled = RuntimeProfiler::IsEnabled(); |
| // When CPU profiling is enabled both JavaScript and C++ code is |
| // profiled. We must not suspend. |
| if (!cpu_profiling_enabled) { |
| if (rate_limiter_.SuspendIfNecessary()) continue; |
| } |
| if (cpu_profiling_enabled && runtime_profiler_enabled) { |
| if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) { |
| return; |
| } |
| Sleep(HALF_INTERVAL); |
| if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) { |
| return; |
| } |
| Sleep(HALF_INTERVAL); |
| } else { |
| if (cpu_profiling_enabled) { |
| if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, |
| this)) { |
| return; |
| } |
| } |
| if (runtime_profiler_enabled) { |
| if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, |
| NULL)) { |
| return; |
| } |
| } |
| Sleep(FULL_INTERVAL); |
| } |
| } |
| } |
| |
| static void DoCpuProfile(Sampler* sampler, void* raw_sender) { |
| if (!sampler->IsProfiling()) return; |
| SignalSender* sender = reinterpret_cast<SignalSender*>(raw_sender); |
| sender->SendProfilingSignal(sampler->platform_data()->vm_tid()); |
| } |
| |
| static void DoRuntimeProfile(Sampler* sampler, void* ignored) { |
| if (!sampler->isolate()->IsInitialized()) return; |
| sampler->isolate()->runtime_profiler()->NotifyTick(); |
| } |
| |
| void SendProfilingSignal(pthread_t tid) { |
| if (!signal_handler_installed_) return; |
| pthread_kill(tid, SIGPROF); |
| } |
| |
| void Sleep(SleepInterval full_or_half) { |
| // Convert ms to us and subtract 100 us to compensate delays |
| // occuring during signal delivery. |
| useconds_t interval = interval_ * 1000 - 100; |
| if (full_or_half == HALF_INTERVAL) interval /= 2; |
| int result = usleep(interval); |
| #ifdef DEBUG |
| if (result != 0 && errno != EINTR) { |
| fprintf(stderr, |
| "SignalSender usleep error; interval = %u, errno = %d\n", |
| interval, |
| errno); |
| ASSERT(result == 0 || errno == EINTR); |
| } |
| #endif |
| USE(result); |
| } |
| |
| const int interval_; |
| RuntimeProfilerRateLimiter rate_limiter_; |
| |
| // Protects the process wide state below. |
| static Mutex* mutex_; |
| static SignalSender* instance_; |
| static bool signal_handler_installed_; |
| static struct sigaction old_signal_handler_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SignalSender); |
| }; |
| |
| Mutex* SignalSender::mutex_ = OS::CreateMutex(); |
| SignalSender* SignalSender::instance_ = NULL; |
| struct sigaction SignalSender::old_signal_handler_; |
| bool SignalSender::signal_handler_installed_ = false; |
| |
| |
| Sampler::Sampler(Isolate* isolate, int interval) |
| : isolate_(isolate), |
| interval_(interval), |
| profiling_(false), |
| active_(false), |
| samples_taken_(0) { |
| data_ = new PlatformData; |
| } |
| |
| |
| Sampler::~Sampler() { |
| ASSERT(!IsActive()); |
| delete data_; |
| } |
| |
| |
| void Sampler::Start() { |
| ASSERT(!IsActive()); |
| SetActive(true); |
| SignalSender::AddActiveSampler(this); |
| } |
| |
| |
| void Sampler::Stop() { |
| ASSERT(IsActive()); |
| SignalSender::RemoveActiveSampler(this); |
| SetActive(false); |
| } |
| |
| #endif // ENABLE_LOGGING_AND_PROFILING |
| |
| } } // namespace v8::internal |