diff options
Diffstat (limited to 'src/3rdparty/v8/src/platform-openbsd.cc')
| -rw-r--r-- | src/3rdparty/v8/src/platform-openbsd.cc | 975 |
1 files changed, 0 insertions, 975 deletions
diff --git a/src/3rdparty/v8/src/platform-openbsd.cc b/src/3rdparty/v8/src/platform-openbsd.cc deleted file mode 100644 index ccccedc..0000000 --- a/src/3rdparty/v8/src/platform-openbsd.cc +++ /dev/null @@ -1,975 +0,0 @@ -// Copyright 2012 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 OpenBSD and NetBSD 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/syscall.h> -#include <sys/types.h> -#include <stdlib.h> - -#include <sys/types.h> // mmap & munmap -#include <sys/mman.h> // mmap & munmap -#include <sys/stat.h> // open -#include <fcntl.h> // open -#include <unistd.h> // sysconf -#include <execinfo.h> // backtrace, backtrace_symbols -#include <strings.h> // index -#include <errno.h> -#include <stdarg.h> - -#undef MAP_TYPE - -#include "v8.h" - -#include "platform-posix.h" -#include "platform.h" -#include "v8threads.h" -#include "vm-state-inl.h" - - -namespace v8 { -namespace internal { - -// 0 is never a valid thread id on Linux and OpenBSD since tids and pids share a -// name space and pid 0 is reserved (see man 2 kill). -static const pthread_t kNoThread = (pthread_t) 0; - - -double ceiling(double x) { - return ceil(x); -} - - -static Mutex* limit_mutex = NULL; - - -static void* GetRandomMmapAddr() { - Isolate* isolate = Isolate::UncheckedCurrent(); - // Note that the current isolate isn't set up in a call path via - // CpuFeatures::Probe. We don't care about randomization in this case because - // the code page is immediately freed. - if (isolate != NULL) { -#ifdef V8_TARGET_ARCH_X64 - uint64_t rnd1 = V8::RandomPrivate(isolate); - uint64_t rnd2 = V8::RandomPrivate(isolate); - uint64_t raw_addr = (rnd1 << 32) ^ rnd2; - // Currently available CPUs have 48 bits of virtual addressing. Truncate - // the hint address to 46 bits to give the kernel a fighting chance of - // fulfilling our placement request. - raw_addr &= V8_UINT64_C(0x3ffffffff000); -#else - uint32_t raw_addr = V8::RandomPrivate(isolate); - // The range 0x20000000 - 0x60000000 is relatively unpopulated across a - // variety of ASLR modes (PAE kernel, NX compat mode, etc). - raw_addr &= 0x3ffff000; - raw_addr += 0x20000000; -#endif - return reinterpret_cast<void*>(raw_addr); - } - return NULL; -} - - -void OS::PostSetUp() { - POSIXPostSetUp(); -} - - -uint64_t OS::CpuFeaturesImpliedByPlatform() { - return 0; -} - - -int OS::ActivationFrameAlignment() { - // With gcc 4.4 the tree vectorization optimizer can generate code - // that requires 16 byte alignment such as movdqa on x86. - return 16; -} - - -void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) { - __asm__ __volatile__("" : : : "memory"); - // An x86 store acts as a release barrier. - *ptr = value; -} - - -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, i.e., 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 sysconf(_SC_PAGESIZE); -} - - -void* OS::Allocate(const size_t requested, - size_t* allocated, - bool is_executable) { - const size_t msize = RoundUp(requested, AllocateAlignment()); - int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); - void* addr = GetRandomMmapAddr(); - void* mbase = mmap(addr, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0); - if (mbase == MAP_FAILED) { - LOG(i::Isolate::Current(), - StringEvent("OS::Allocate", "mmap failed")); - return NULL; - } - *allocated = msize; - UpdateAllocatedSpaceLimits(mbase, msize); - return mbase; -} - - -void OS::Free(void* address, const size_t size) { - // TODO(1240712): munmap has a return value which is ignored here. - int result = munmap(address, size); - USE(result); - ASSERT(result == 0); -} - - -void OS::Sleep(int milliseconds) { - unsigned int ms = static_cast<unsigned int>(milliseconds); - usleep(1000 * ms); -} - - -int OS::NumberOfCores() { - return sysconf(_SC_NPROCESSORS_ONLN); -} - - -void OS::Abort() { - // Redirect to std abort to signal abnormal program termination. - abort(); -} - - -void OS::DebugBreak() { - asm("int $3"); -} - - -void OS::DumpBacktrace() { - // Currently unsupported. -} - - -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_) OS::Free(memory_, size_); - fclose(file_); -} - - -void OS::LogSharedLibraryAddresses() { - // This function assumes that the layout of the file is as follows: - // hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name] - // If we encounter an unexpected situation we abort scanning further entries. - FILE* fp = fopen("/proc/self/maps", "r"); - if (fp == NULL) return; - - // Allocate enough room to be able to store a full file name. - const int kLibNameLen = FILENAME_MAX + 1; - char* lib_name = reinterpret_cast<char*>(malloc(kLibNameLen)); - - i::Isolate* isolate = ISOLATE; - // This loop will terminate once the scanning hits an EOF. - while (true) { - uintptr_t start, end; - char attr_r, attr_w, attr_x, attr_p; - // Parse the addresses and permission bits at the beginning of the line. - if (fscanf(fp, "%" V8PRIxPTR "-%" V8PRIxPTR, &start, &end) != 2) break; - if (fscanf(fp, " %c%c%c%c", &attr_r, &attr_w, &attr_x, &attr_p) != 4) break; - - int c; - if (attr_r == 'r' && attr_w != 'w' && attr_x == 'x') { - // Found a read-only executable entry. Skip characters until we reach - // the beginning of the filename or the end of the line. - do { - c = getc(fp); - } while ((c != EOF) && (c != '\n') && (c != '/')); - if (c == EOF) break; // EOF: Was unexpected, just exit. - - // Process the filename if found. - if (c == '/') { - ungetc(c, fp); // Push the '/' back into the stream to be read below. - - // Read to the end of the line. Exit if the read fails. - if (fgets(lib_name, kLibNameLen, fp) == NULL) break; - - // Drop the newline character read by fgets. We do not need to check - // for a zero-length string because we know that we at least read the - // '/' character. - lib_name[strlen(lib_name) - 1] = '\0'; - } else { - // No library name found, just record the raw address range. - snprintf(lib_name, kLibNameLen, - "%08" V8PRIxPTR "-%08" V8PRIxPTR, start, end); - } - LOG(isolate, SharedLibraryEvent(lib_name, start, end)); - } else { - // Entry not describing executable data. Skip to end of line to set up - // reading the next entry. - do { - c = getc(fp); - } while ((c != EOF) && (c != '\n')); - if (c == EOF) break; - } - } - free(lib_name); - fclose(fp); -} - - -void OS::SignalCodeMovingGC() { - // Support for ll_prof.py. - // - // The Linux profiler built into the kernel logs all mmap's with - // PROT_EXEC so that analysis tools can properly attribute ticks. We - // do a mmap with a name known by ll_prof.py and immediately munmap - // it. This injects a GC marker into the stream of events generated - // by the kernel and allows us to synchronize V8 code log and the - // kernel log. - int size = sysconf(_SC_PAGESIZE); - FILE* f = fopen(FLAG_gc_fake_mmap, "w+"); - void* addr = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_PRIVATE, - fileno(f), 0); - ASSERT(addr != MAP_FAILED); - OS::Free(addr, size); - fclose(f); -} - - -int OS::StackWalk(Vector<OS::StackFrame> frames) { - // backtrace is a glibc extension. - 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() : address_(NULL), size_(0) { } - -VirtualMemory::VirtualMemory(size_t size) { - address_ = ReserveRegion(size); - size_ = size; -} - - -VirtualMemory::VirtualMemory(size_t size, size_t alignment) - : address_(NULL), size_(0) { - ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment()))); - size_t request_size = RoundUp(size + alignment, - static_cast<intptr_t>(OS::AllocateAlignment())); - void* reservation = mmap(GetRandomMmapAddr(), - request_size, - PROT_NONE, - MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, - kMmapFd, - kMmapFdOffset); - if (reservation == MAP_FAILED) return; - - Address base = static_cast<Address>(reservation); - Address aligned_base = RoundUp(base, alignment); - ASSERT_LE(base, aligned_base); - - // Unmap extra memory reserved before and after the desired block. - if (aligned_base != base) { - size_t prefix_size = static_cast<size_t>(aligned_base - base); - OS::Free(base, prefix_size); - request_size -= prefix_size; - } - - size_t aligned_size = RoundUp(size, OS::AllocateAlignment()); - ASSERT_LE(aligned_size, request_size); - - if (aligned_size != request_size) { - size_t suffix_size = request_size - aligned_size; - OS::Free(aligned_base + aligned_size, suffix_size); - request_size -= suffix_size; - } - - ASSERT(aligned_size == request_size); - - address_ = static_cast<void*>(aligned_base); - size_ = aligned_size; -} - - -VirtualMemory::~VirtualMemory() { - if (IsReserved()) { - bool result = ReleaseRegion(address(), size()); - ASSERT(result); - USE(result); - } -} - - -bool VirtualMemory::IsReserved() { - return address_ != NULL; -} - - -void VirtualMemory::Reset() { - address_ = NULL; - size_ = 0; -} - - -bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { - return CommitRegion(address, size, is_executable); -} - - -bool VirtualMemory::Uncommit(void* address, size_t size) { - return UncommitRegion(address, size); -} - - -bool VirtualMemory::Guard(void* address) { - OS::Guard(address, OS::CommitPageSize()); - return true; -} - - -void* VirtualMemory::ReserveRegion(size_t size) { - void* result = mmap(GetRandomMmapAddr(), - size, - PROT_NONE, - MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, - kMmapFd, - kMmapFdOffset); - - if (result == MAP_FAILED) return NULL; - - return result; -} - - -bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) { - int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); - if (MAP_FAILED == mmap(base, - size, - prot, - MAP_PRIVATE | MAP_ANON | MAP_FIXED, - kMmapFd, - kMmapFdOffset)) { - return false; - } - - UpdateAllocatedSpaceLimits(base, size); - return true; -} - - -bool VirtualMemory::UncommitRegion(void* base, size_t size) { - return mmap(base, - size, - PROT_NONE, - MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_FIXED, - kMmapFd, - kMmapFdOffset) != MAP_FAILED; -} - - -bool VirtualMemory::ReleaseRegion(void* base, size_t size) { - return munmap(base, size) == 0; -} - - -bool VirtualMemory::HasLazyCommits() { - // TODO(alph): implement for the platform. - return false; -} - - -class Thread::PlatformData : public Malloced { - public: - PlatformData() : thread_(kNoThread) {} - - pthread_t thread_; // Thread handle for pthread. -}; - -Thread::Thread(const Options& options) - : data_(new PlatformData()), - stack_size_(options.stack_size()) { - set_name(options.name()); -} - - -Thread::~Thread() { - delete data_; -} - - -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. -#ifdef PR_SET_NAME - prctl(PR_SET_NAME, - reinterpret_cast<unsigned long>(thread->name()), // NOLINT - 0, 0, 0); -#endif - thread->data()->thread_ = pthread_self(); - ASSERT(thread->data()->thread_ != kNoThread); - 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(&data_->thread_, attr_ptr, ThreadEntry, this); - ASSERT(data_->thread_ != kNoThread); -} - - -void Thread::Join() { - pthread_join(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 OpenBSDMutex : public Mutex { - public: - OpenBSDMutex() { - 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); - USE(result); - } - - virtual ~OpenBSDMutex() { 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 OpenBSDMutex(); -} - - -class OpenBSDSemaphore : public Semaphore { - public: - explicit OpenBSDSemaphore(int count) { sem_init(&sem_, 0, count); } - virtual ~OpenBSDSemaphore() { sem_destroy(&sem_); } - - virtual void Wait(); - virtual bool Wait(int timeout); - virtual void Signal() { sem_post(&sem_); } - private: - sem_t sem_; -}; - - -void OpenBSDSemaphore::Wait() { - while (true) { - int result = sem_wait(&sem_); - if (result == 0) return; // Successfully got semaphore. - CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. - } -} - - -#ifndef TIMEVAL_TO_TIMESPEC -#define TIMEVAL_TO_TIMESPEC(tv, ts) do { \ - (ts)->tv_sec = (tv)->tv_sec; \ - (ts)->tv_nsec = (tv)->tv_usec * 1000; \ -} while (false) -#endif - - -bool OpenBSDSemaphore::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); - - int to = ts.tv_sec; - - while (true) { - int result = sem_trywait(&sem_); - if (result == 0) return true; // Successfully got semaphore. - if (!to) return false; // Timeout. - CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. - usleep(ts.tv_nsec / 1000); - to--; - } -} - -Semaphore* OS::CreateSemaphore(int count) { - return new OpenBSDSemaphore(count); -} - - -static pthread_t GetThreadID() { - return pthread_self(); -} - -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; - } - if (v8::Locker::IsActive() && - !isolate->thread_manager()->IsLockedByCurrentThread()) { - 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. - sample->state = isolate->current_vm_state(); - ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); -#ifdef __NetBSD__ - mcontext_t& mcontext = ucontext->uc_mcontext; -#if V8_HOST_ARCH_IA32 - sample->pc = reinterpret_cast<Address>(mcontext.__gregs[_REG_EIP]); - sample->sp = reinterpret_cast<Address>(mcontext.__gregs[_REG_ESP]); - sample->fp = reinterpret_cast<Address>(mcontext.__gregs[_REG_EBP]); -#elif V8_HOST_ARCH_X64 - sample->pc = reinterpret_cast<Address>(mcontext.__gregs[_REG_RIP]); - sample->sp = reinterpret_cast<Address>(mcontext.__gregs[_REG_RSP]); - sample->fp = reinterpret_cast<Address>(mcontext.__gregs[_REG_RBP]); -#endif // V8_HOST_ARCH -#else // OpenBSD -#if V8_HOST_ARCH_IA32 - sample->pc = reinterpret_cast<Address>(ucontext->sc_eip); - sample->sp = reinterpret_cast<Address>(ucontext->sc_esp); - sample->fp = reinterpret_cast<Address>(ucontext->sc_ebp); -#elif V8_HOST_ARCH_X64 - sample->pc = reinterpret_cast<Address>(ucontext->sc_rip); - sample->sp = reinterpret_cast<Address>(ucontext->sc_rsp); - sample->fp = reinterpret_cast<Address>(ucontext->sc_rbp); -#endif // V8_HOST_ARCH -#endif // __NetBSD__ - sampler->SampleStack(sample); - sampler->Tick(sample); -} - - -class Sampler::PlatformData : public Malloced { - public: - PlatformData() : vm_tid_(GetThreadID()) {} - - pthread_t vm_tid() const { return vm_tid_; } - - private: - pthread_t vm_tid_; -}; - - -class SignalSender : public Thread { - public: - static const int kSignalSenderStackSize = 64 * KB; - - explicit SignalSender(int interval) - : Thread(Thread::Options("SignalSender", kSignalSenderStackSize)), - vm_tgid_(getpid()), - interval_(interval) {} - - static void SetUp() { if (!mutex_) mutex_ = OS::CreateMutex(); } - static void TearDown() { delete mutex_; } - - static void InstallSignalHandler() { - 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); - } - - static void RestoreSignalHandler() { - if (signal_handler_installed_) { - sigaction(SIGPROF, &old_signal_handler_, 0); - signal_handler_installed_ = false; - } - } - - static void AddActiveSampler(Sampler* sampler) { - ScopedLock lock(mutex_); - SamplerRegistry::AddActiveSampler(sampler); - if (instance_ == NULL) { - // Start a thread that will send SIGPROF signal to VM threads, - // when CPU profiling will be enabled. - 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::StopRuntimeProfilerThreadBeforeShutdown(instance_); - delete instance_; - instance_ = NULL; - RestoreSignalHandler(); - } - } - - // Implement Thread::Run(). - virtual void Run() { - SamplerRegistry::State state; - while ((state = SamplerRegistry::GetState()) != - SamplerRegistry::HAS_NO_SAMPLERS) { - // When CPU profiling is enabled both JavaScript and C++ code is - // profiled. We must not suspend. - if (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS) { - if (!signal_handler_installed_) InstallSignalHandler(); - SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this); - } else { - if (signal_handler_installed_) RestoreSignalHandler(); - if (RuntimeProfiler::WaitForSomeIsolateToEnterJS()) continue; - } - Sleep(); // TODO(svenpanne) Figure out if OS:Sleep(interval_) is enough. - } - } - - 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()); - } - - void SendProfilingSignal(pthread_t tid) { - if (!signal_handler_installed_) return; - pthread_kill(tid, SIGPROF); - } - - void Sleep() { - // Convert ms to us and subtract 100 us to compensate delays - // occuring during signal delivery. - useconds_t interval = interval_ * 1000 - 100; - 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 vm_tgid_; - const int interval_; - - // Protects the process wide state below. - static Mutex* mutex_; - static SignalSender* instance_; - static bool signal_handler_installed_; - static struct sigaction old_signal_handler_; - - private: - DISALLOW_COPY_AND_ASSIGN(SignalSender); -}; - - -Mutex* SignalSender::mutex_ = NULL; -SignalSender* SignalSender::instance_ = NULL; -struct sigaction SignalSender::old_signal_handler_; -bool SignalSender::signal_handler_installed_ = false; - - -void OS::SetUp() { - // Seed the random number generator. We preserve microsecond resolution. - uint64_t seed = Ticks() ^ (getpid() << 16); - srandom(static_cast<unsigned int>(seed)); - limit_mutex = CreateMutex(); - SignalSender::SetUp(); -} - - -void OS::TearDown() { - SignalSender::TearDown(); - delete limit_mutex; -} - - -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); -} - - -bool Sampler::CanSampleOnProfilerEventsProcessorThread() { - return false; -} - - -void Sampler::DoSample() { -} - - -void Sampler::StartProfiling() { -} - - -void Sampler::StopProfiling() { -} - - -} } // namespace v8::internal |