| // 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 MacOS goes here. For the POSIX comaptible parts |
| // the implementation is in platform-posix.cc. |
| |
| #include <ucontext.h> |
| #include <unistd.h> |
| #include <sys/mman.h> |
| #include <mach/mach_init.h> |
| |
| #include <AvailabilityMacros.h> |
| |
| #ifdef MAC_OS_X_VERSION_10_5 |
| # include <execinfo.h> // backtrace, backtrace_symbols |
| #endif |
| |
| #include <pthread.h> |
| #include <semaphore.h> |
| #include <signal.h> |
| #include <mach/semaphore.h> |
| #include <mach/task.h> |
| #include <sys/time.h> |
| #include <sys/resource.h> |
| #include <sys/types.h> |
| #include <stdarg.h> |
| #include <stdlib.h> |
| |
| #include <errno.h> |
| |
| #undef MAP_TYPE |
| |
| #include "v8.h" |
| |
| #include "platform.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // 0 is never a valid thread id on MacOSX since a ptread_t is |
| // a pointer. |
| static const pthread_t kNoThread = (pthread_t) 0; |
| |
| |
| double ceiling(double x) { |
| // Correct Mac OS X Leopard 'ceil' behavior. |
| if (-1.0 < x && x < 0.0) { |
| return -0.0; |
| } else { |
| return ceil(x); |
| } |
| } |
| |
| |
| 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 will 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)); |
| } |
| |
| |
| // 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) { |
| 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 is_executable) { |
| const size_t msize = RoundUp(requested, getpagesize()); |
| int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); |
| void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0); |
| if (mbase == MAP_FAILED) { |
| LOG(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. |
| munmap(address, size); |
| } |
| |
| |
| #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) { |
| usleep(1000 * milliseconds); |
| } |
| |
| |
| void OS::Abort() { |
| // Redirect to std abort to signal abnormal program termination |
| abort(); |
| } |
| |
| |
| void OS::DebugBreak() { |
| asm("int $3"); |
| } |
| |
| |
| 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_; } |
| private: |
| FILE* file_; |
| void* memory_; |
| int size_; |
| }; |
| |
| |
| OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, |
| void* initial) { |
| FILE* file = fopen(name, "w+"); |
| if (file == NULL) return NULL; |
| fwrite(initial, size, 1, file); |
| 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_); |
| } |
| |
| |
| void OS::LogSharedLibraryAddresses() { |
| // TODO(1233579): Implement. |
| } |
| |
| |
| double OS::nan_value() { |
| return NAN; |
| } |
| |
| |
| int OS::ActivationFrameAlignment() { |
| // OS X activation frames must be 16 byte-aligned; see "Mac OS X ABI |
| // Function Call Guide". |
| return 16; |
| } |
| |
| |
| int OS::StackWalk(Vector<StackFrame> frames) { |
| #ifndef MAC_OS_X_VERSION_10_5 |
| return 0; |
| #else |
| int frames_size = frames.length(); |
| void** addresses = NewArray<void*>(frames_size); |
| int frames_count = backtrace(addresses, frames_size); |
| |
| char** symbols; |
| symbols = backtrace_symbols(addresses, frames_count); |
| if (symbols == NULL) { |
| DeleteArray(addresses); |
| 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'; |
| } |
| |
| DeleteArray(addresses); |
| free(symbols); |
| |
| return frames_count; |
| #endif |
| } |
| |
| |
| // 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 is_executable) { |
| int prot = PROT_READ | PROT_WRITE | (is_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, |
| 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() : ThreadHandle(ThreadHandle::INVALID) { |
| } |
| |
| |
| 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->Run(); |
| return NULL; |
| } |
| |
| |
| void Thread::Start() { |
| pthread_create(&thread_handle_data()->thread_, NULL, ThreadEntry, this); |
| } |
| |
| |
| 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 MacOSMutex : public Mutex { |
| public: |
| |
| MacOSMutex() { |
| // For some reason the compiler doesn't allow you to write |
| // "this->mutex_ = PTHREAD_..." directly on mac. |
| pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER; |
| pthread_mutexattr_t attr; |
| pthread_mutexattr_init(&attr); |
| pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
| pthread_mutex_init(&m, &attr); |
| mutex_ = m; |
| } |
| |
| ~MacOSMutex() { pthread_mutex_destroy(&mutex_); } |
| |
| int Lock() { return pthread_mutex_lock(&mutex_); } |
| |
| int Unlock() { return pthread_mutex_unlock(&mutex_); } |
| |
| private: |
| pthread_mutex_t mutex_; |
| }; |
| |
| |
| Mutex* OS::CreateMutex() { |
| return new MacOSMutex(); |
| } |
| |
| |
| class MacOSSemaphore : public Semaphore { |
| public: |
| explicit MacOSSemaphore(int count) { |
| semaphore_create(mach_task_self(), &semaphore_, SYNC_POLICY_FIFO, count); |
| } |
| |
| ~MacOSSemaphore() { |
| semaphore_destroy(mach_task_self(), semaphore_); |
| } |
| |
| // The MacOS mach semaphore documentation claims it does not have spurious |
| // wakeups, the way pthreads semaphores do. So the code from the linux |
| // platform is not needed here. |
| void Wait() { semaphore_wait(semaphore_); } |
| |
| bool Wait(int timeout); |
| |
| void Signal() { semaphore_signal(semaphore_); } |
| |
| private: |
| semaphore_t semaphore_; |
| }; |
| |
| |
| bool MacOSSemaphore::Wait(int timeout) { |
| mach_timespec_t ts; |
| ts.tv_sec = timeout / 1000000; |
| ts.tv_nsec = (timeout % 1000000) * 1000; |
| return semaphore_timedwait(semaphore_, ts) != KERN_OPERATION_TIMED_OUT; |
| } |
| |
| |
| Semaphore* OS::CreateSemaphore(int count) { |
| return new MacOSSemaphore(count); |
| } |
| |
| |
| #ifdef ENABLE_LOGGING_AND_PROFILING |
| |
| static Sampler* active_sampler_ = NULL; |
| |
| static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) { |
| USE(info); |
| if (signal != SIGPROF) return; |
| if (active_sampler_ == NULL) return; |
| |
| TickSample sample; |
| |
| // If profiling, we extract the current pc and sp. |
| if (active_sampler_->IsProfiling()) { |
| // Extracting the sample from the context is extremely machine dependent. |
| ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); |
| mcontext_t& mcontext = ucontext->uc_mcontext; |
| #if V8_HOST_ARCH_X64 |
| UNIMPLEMENTED(); |
| USE(mcontext); |
| sample.pc = 0; |
| sample.sp = 0; |
| sample.fp = 0; |
| #elif V8_HOST_ARCH_IA32 |
| #if __DARWIN_UNIX03 |
| sample.pc = mcontext->__ss.__eip; |
| sample.sp = mcontext->__ss.__esp; |
| sample.fp = mcontext->__ss.__ebp; |
| #else // !__DARWIN_UNIX03 |
| sample.pc = mcontext->ss.eip; |
| sample.sp = mcontext->ss.esp; |
| sample.fp = mcontext->ss.ebp; |
| #endif // __DARWIN_UNIX03 |
| #else |
| #error Unsupported Mac OS X host architecture. |
| #endif // V8_TARGET_ARCH_IA32 |
| } |
| |
| // We always sample the VM state. |
| sample.state = Logger::state(); |
| |
| active_sampler_->Tick(&sample); |
| } |
| |
| |
| class Sampler::PlatformData : public Malloced { |
| public: |
| PlatformData() { |
| signal_handler_installed_ = false; |
| } |
| |
| bool signal_handler_installed_; |
| struct sigaction old_signal_handler_; |
| struct itimerval old_timer_value_; |
| }; |
| |
| |
| Sampler::Sampler(int interval, bool profiling) |
| : interval_(interval), profiling_(profiling), active_(false) { |
| data_ = new PlatformData(); |
| } |
| |
| |
| Sampler::~Sampler() { |
| delete data_; |
| } |
| |
| |
| void Sampler::Start() { |
| // There can only be one active sampler at the time on POSIX |
| // platforms. |
| if (active_sampler_ != NULL) return; |
| |
| // Request profiling signals. |
| struct sigaction sa; |
| sa.sa_sigaction = ProfilerSignalHandler; |
| sigemptyset(&sa.sa_mask); |
| sa.sa_flags = SA_SIGINFO; |
| if (sigaction(SIGPROF, &sa, &data_->old_signal_handler_) != 0) return; |
| data_->signal_handler_installed_ = true; |
| |
| // Set the itimer to generate a tick for each interval. |
| itimerval itimer; |
| itimer.it_interval.tv_sec = interval_ / 1000; |
| itimer.it_interval.tv_usec = (interval_ % 1000) * 1000; |
| itimer.it_value.tv_sec = itimer.it_interval.tv_sec; |
| itimer.it_value.tv_usec = itimer.it_interval.tv_usec; |
| setitimer(ITIMER_PROF, &itimer, &data_->old_timer_value_); |
| |
| // Set this sampler as the active sampler. |
| active_sampler_ = this; |
| active_ = true; |
| } |
| |
| |
| void Sampler::Stop() { |
| // Restore old signal handler |
| if (data_->signal_handler_installed_) { |
| setitimer(ITIMER_PROF, &data_->old_timer_value_, NULL); |
| sigaction(SIGPROF, &data_->old_signal_handler_, 0); |
| data_->signal_handler_installed_ = false; |
| } |
| |
| // This sampler is no longer the active sampler. |
| active_sampler_ = NULL; |
| active_ = false; |
| } |
| |
| #endif // ENABLE_LOGGING_AND_PROFILING |
| |
| } } // namespace v8::internal |