| // 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 MacOS goes here. For the POSIX comaptible parts |
| // the implementation is in platform-posix.cc. |
| |
| #include <dlfcn.h> |
| #include <unistd.h> |
| #include <sys/mman.h> |
| #include <mach/mach_init.h> |
| #include <mach-o/dyld.h> |
| #include <mach-o/getsect.h> |
| |
| #include <AvailabilityMacros.h> |
| |
| #include <pthread.h> |
| #include <semaphore.h> |
| #include <signal.h> |
| #include <libkern/OSAtomic.h> |
| #include <mach/mach.h> |
| #include <mach/semaphore.h> |
| #include <mach/task.h> |
| #include <mach/vm_statistics.h> |
| #include <sys/time.h> |
| #include <sys/resource.h> |
| #include <sys/types.h> |
| #include <sys/sysctl.h> |
| #include <stdarg.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #undef MAP_TYPE |
| |
| #include "v8.h" |
| |
| #include "platform-posix.h" |
| #include "platform.h" |
| #include "vm-state-inl.h" |
| |
| // Manually define these here as weak imports, rather than including execinfo.h. |
| // This lets us launch on 10.4 which does not have these calls. |
| extern "C" { |
| extern int backtrace(void**, int) __attribute__((weak_import)); |
| extern char** backtrace_symbols(void* const*, int) |
| __attribute__((weak_import)); |
| extern void backtrace_symbols_fd(void* const*, int, int) |
| __attribute__((weak_import)); |
| } |
| |
| |
| namespace v8 { |
| namespace internal { |
| |
| // 0 is never a valid thread id on MacOSX since a pthread_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); |
| } |
| } |
| |
| |
| static Mutex* limit_mutex = NULL; |
| |
| |
| void OS::PostSetUp() { |
| POSIXPostSetUp(); |
| } |
| |
| |
| // 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 getpagesize(); |
| } |
| |
| |
| // Constants used for mmap. |
| // kMmapFd is used to pass vm_alloc flags to tag the region with the user |
| // defined tag 255 This helps identify V8-allocated regions in memory analysis |
| // tools like vmmap(1). |
| static const int kMmapFd = VM_MAKE_TAG(255); |
| static const off_t kMmapFdOffset = 0; |
| |
| |
| 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(OS::GetRandomMmapAddr(), |
| msize, |
| prot, |
| MAP_PRIVATE | MAP_ANON, |
| kMmapFd, |
| kMmapFdOffset); |
| if (mbase == MAP_FAILED) { |
| LOG(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) { |
| 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_; } |
| 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(OS::GetRandomMmapAddr(), |
| 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(OS::GetRandomMmapAddr(), |
| 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() { |
| unsigned int images_count = _dyld_image_count(); |
| for (unsigned int i = 0; i < images_count; ++i) { |
| const mach_header* header = _dyld_get_image_header(i); |
| if (header == NULL) continue; |
| #if V8_HOST_ARCH_X64 |
| uint64_t size; |
| char* code_ptr = getsectdatafromheader_64( |
| reinterpret_cast<const mach_header_64*>(header), |
| SEG_TEXT, |
| SECT_TEXT, |
| &size); |
| #else |
| unsigned int size; |
| char* code_ptr = getsectdatafromheader(header, SEG_TEXT, SECT_TEXT, &size); |
| #endif |
| if (code_ptr == NULL) continue; |
| const uintptr_t slide = _dyld_get_image_vmaddr_slide(i); |
| const uintptr_t start = reinterpret_cast<uintptr_t>(code_ptr) + slide; |
| LOG(Isolate::Current(), |
| SharedLibraryEvent(_dyld_get_image_name(i), start, start + size)); |
| } |
| } |
| |
| |
| void OS::SignalCodeMovingGC() { |
| } |
| |
| |
| uint64_t OS::CpuFeaturesImpliedByPlatform() { |
| // MacOSX requires all these to install so we can assume they are present. |
| // These constants are defined by the CPUid instructions. |
| const uint64_t one = 1; |
| return (one << SSE2) | (one << CMOV) | (one << RDTSC) | (one << CPUID); |
| } |
| |
| |
| int OS::ActivationFrameAlignment() { |
| // OS X activation frames must be 16 byte-aligned; see "Mac OS X ABI |
| // Function Call Guide". |
| return 16; |
| } |
| |
| |
| void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) { |
| OSMemoryBarrier(); |
| *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)); |
| } |
| |
| |
| int OS::StackWalk(Vector<StackFrame> frames) { |
| // If weak link to execinfo lib has failed, ie because we are on 10.4, abort. |
| if (backtrace == NULL) |
| return 0; |
| |
| 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; |
| } |
| |
| |
| 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(OS::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); |
| } |
| } |
| |
| |
| void VirtualMemory::Reset() { |
| address_ = NULL; |
| size_ = 0; |
| } |
| |
| |
| void* VirtualMemory::ReserveRegion(size_t size) { |
| void* result = mmap(OS::GetRandomMmapAddr(), |
| size, |
| PROT_NONE, |
| MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, |
| kMmapFd, |
| kMmapFdOffset); |
| |
| if (result == MAP_FAILED) return NULL; |
| |
| return result; |
| } |
| |
| |
| bool VirtualMemory::IsReserved() { |
| return address_ != NULL; |
| } |
| |
| |
| bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { |
| return CommitRegion(address, size, is_executable); |
| } |
| |
| |
| bool VirtualMemory::Guard(void* address) { |
| OS::Guard(address, OS::CommitPageSize()); |
| return true; |
| } |
| |
| |
| bool VirtualMemory::CommitRegion(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 UncommitRegion(address, size); |
| } |
| |
| |
| bool VirtualMemory::UncommitRegion(void* address, size_t size) { |
| return mmap(address, |
| size, |
| PROT_NONE, |
| MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_FIXED, |
| kMmapFd, |
| kMmapFdOffset) != MAP_FAILED; |
| } |
| |
| |
| bool VirtualMemory::ReleaseRegion(void* address, size_t size) { |
| return munmap(address, size) == 0; |
| } |
| |
| |
| bool VirtualMemory::HasLazyCommits() { |
| 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 SetThreadName(const char* name) { |
| // pthread_setname_np is only available in 10.6 or later, so test |
| // for it at runtime. |
| int (*dynamic_pthread_setname_np)(const char*); |
| *reinterpret_cast<void**>(&dynamic_pthread_setname_np) = |
| dlsym(RTLD_DEFAULT, "pthread_setname_np"); |
| if (!dynamic_pthread_setname_np) |
| return; |
| |
| // Mac OS X does not expose the length limit of the name, so hardcode it. |
| static const int kMaxNameLength = 63; |
| USE(kMaxNameLength); |
| ASSERT(Thread::kMaxThreadNameLength <= kMaxNameLength); |
| dynamic_pthread_setname_np(name); |
| } |
| |
| |
| 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->data()->thread_ = pthread_self(); |
| SetThreadName(thread->name()); |
| 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); |
| } |
| |
| |
| #ifdef V8_FAST_TLS_SUPPORTED |
| |
| static Atomic32 tls_base_offset_initialized = 0; |
| intptr_t kMacTlsBaseOffset = 0; |
| |
| // It's safe to do the initialization more that once, but it has to be |
| // done at least once. |
| static void InitializeTlsBaseOffset() { |
| const size_t kBufferSize = 128; |
| char buffer[kBufferSize]; |
| size_t buffer_size = kBufferSize; |
| int ctl_name[] = { CTL_KERN , KERN_OSRELEASE }; |
| if (sysctl(ctl_name, 2, buffer, &buffer_size, NULL, 0) != 0) { |
| V8_Fatal(__FILE__, __LINE__, "V8 failed to get kernel version"); |
| } |
| // The buffer now contains a string of the form XX.YY.ZZ, where |
| // XX is the major kernel version component. |
| // Make sure the buffer is 0-terminated. |
| buffer[kBufferSize - 1] = '\0'; |
| char* period_pos = strchr(buffer, '.'); |
| *period_pos = '\0'; |
| int kernel_version_major = |
| static_cast<int>(strtol(buffer, NULL, 10)); // NOLINT |
| // The constants below are taken from pthreads.s from the XNU kernel |
| // sources archive at www.opensource.apple.com. |
| if (kernel_version_major < 11) { |
| // 8.x.x (Tiger), 9.x.x (Leopard), 10.x.x (Snow Leopard) have the |
| // same offsets. |
| #if defined(V8_HOST_ARCH_IA32) |
| kMacTlsBaseOffset = 0x48; |
| #else |
| kMacTlsBaseOffset = 0x60; |
| #endif |
| } else { |
| // 11.x.x (Lion) changed the offset. |
| kMacTlsBaseOffset = 0; |
| } |
| |
| Release_Store(&tls_base_offset_initialized, 1); |
| } |
| |
| static void CheckFastTls(Thread::LocalStorageKey key) { |
| void* expected = reinterpret_cast<void*>(0x1234CAFE); |
| Thread::SetThreadLocal(key, expected); |
| void* actual = Thread::GetExistingThreadLocal(key); |
| if (expected != actual) { |
| V8_Fatal(__FILE__, __LINE__, |
| "V8 failed to initialize fast TLS on current kernel"); |
| } |
| Thread::SetThreadLocal(key, NULL); |
| } |
| |
| #endif // V8_FAST_TLS_SUPPORTED |
| |
| |
| Thread::LocalStorageKey Thread::CreateThreadLocalKey() { |
| #ifdef V8_FAST_TLS_SUPPORTED |
| bool check_fast_tls = false; |
| if (tls_base_offset_initialized == 0) { |
| check_fast_tls = true; |
| InitializeTlsBaseOffset(); |
| } |
| #endif |
| pthread_key_t key; |
| int result = pthread_key_create(&key, NULL); |
| USE(result); |
| ASSERT(result == 0); |
| LocalStorageKey typed_key = static_cast<LocalStorageKey>(key); |
| #ifdef V8_FAST_TLS_SUPPORTED |
| // If we just initialized fast TLS support, make sure it works. |
| if (check_fast_tls) CheckFastTls(typed_key); |
| #endif |
| return typed_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() { |
| pthread_mutexattr_t attr; |
| pthread_mutexattr_init(&attr); |
| pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
| pthread_mutex_init(&mutex_, &attr); |
| } |
| |
| virtual ~MacOSMutex() { pthread_mutex_destroy(&mutex_); } |
| |
| virtual int Lock() { return pthread_mutex_lock(&mutex_); } |
| virtual int Unlock() { return pthread_mutex_unlock(&mutex_); } |
| |
| 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_; |
| }; |
| |
| |
| Mutex* OS::CreateMutex() { |
| return new MacOSMutex(); |
| } |
| |
| |
| class MacOSSemaphore : public Semaphore { |
| public: |
| explicit MacOSSemaphore(int count) { |
| int r; |
| r = semaphore_create(mach_task_self(), |
| &semaphore_, |
| SYNC_POLICY_FIFO, |
| count); |
| ASSERT(r == KERN_SUCCESS); |
| } |
| |
| ~MacOSSemaphore() { |
| int r; |
| r = semaphore_destroy(mach_task_self(), semaphore_); |
| ASSERT(r == KERN_SUCCESS); |
| } |
| |
| void Wait() { |
| int r; |
| do { |
| r = semaphore_wait(semaphore_); |
| ASSERT(r == KERN_SUCCESS || r == KERN_ABORTED); |
| } while (r == KERN_ABORTED); |
| } |
| |
| 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); |
| } |
| |
| |
| class Sampler::PlatformData : public Malloced { |
| public: |
| PlatformData() : profiled_thread_(mach_thread_self()) {} |
| |
| ~PlatformData() { |
| // Deallocate Mach port for thread. |
| mach_port_deallocate(mach_task_self(), profiled_thread_); |
| } |
| |
| thread_act_t profiled_thread() { return profiled_thread_; } |
| |
| private: |
| // Note: for profiled_thread_ Mach primitives are used instead of PThread's |
| // because the latter doesn't provide thread manipulation primitives required. |
| // For details, consult "Mac OS X Internals" book, Section 7.3. |
| thread_act_t profiled_thread_; |
| }; |
| |
| |
| class SamplerThread : public Thread { |
| public: |
| static const int kSamplerThreadStackSize = 64 * KB; |
| |
| explicit SamplerThread(int interval) |
| : Thread(Thread::Options("SamplerThread", kSamplerThreadStackSize)), |
| interval_(interval) {} |
| |
| static void SetUp() { if (!mutex_) mutex_ = OS::CreateMutex(); } |
| static void TearDown() { delete mutex_; } |
| |
| static void AddActiveSampler(Sampler* sampler) { |
| ScopedLock lock(mutex_); |
| SamplerRegistry::AddActiveSampler(sampler); |
| if (instance_ == NULL) { |
| instance_ = new SamplerThread(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; |
| } |
| } |
| |
| // 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) { |
| if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) { |
| return; |
| } |
| } |
| if (runtime_profiler_enabled) { |
| if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) { |
| return; |
| } |
| } |
| OS::Sleep(interval_); |
| } |
| } |
| |
| static void DoCpuProfile(Sampler* sampler, void* raw_sampler_thread) { |
| if (!sampler->isolate()->IsInitialized()) return; |
| if (!sampler->IsProfiling()) return; |
| SamplerThread* sampler_thread = |
| reinterpret_cast<SamplerThread*>(raw_sampler_thread); |
| sampler_thread->SampleContext(sampler); |
| } |
| |
| static void DoRuntimeProfile(Sampler* sampler, void* ignored) { |
| if (!sampler->isolate()->IsInitialized()) return; |
| sampler->isolate()->runtime_profiler()->NotifyTick(); |
| } |
| |
| void SampleContext(Sampler* sampler) { |
| thread_act_t profiled_thread = sampler->platform_data()->profiled_thread(); |
| TickSample sample_obj; |
| TickSample* sample = CpuProfiler::StartTickSampleEvent(sampler->isolate()); |
| if (sample == NULL) sample = &sample_obj; |
| |
| if (KERN_SUCCESS != thread_suspend(profiled_thread)) return; |
| |
| #if V8_HOST_ARCH_X64 |
| thread_state_flavor_t flavor = x86_THREAD_STATE64; |
| x86_thread_state64_t state; |
| mach_msg_type_number_t count = x86_THREAD_STATE64_COUNT; |
| #if __DARWIN_UNIX03 |
| #define REGISTER_FIELD(name) __r ## name |
| #else |
| #define REGISTER_FIELD(name) r ## name |
| #endif // __DARWIN_UNIX03 |
| #elif V8_HOST_ARCH_IA32 |
| thread_state_flavor_t flavor = i386_THREAD_STATE; |
| i386_thread_state_t state; |
| mach_msg_type_number_t count = i386_THREAD_STATE_COUNT; |
| #if __DARWIN_UNIX03 |
| #define REGISTER_FIELD(name) __e ## name |
| #else |
| #define REGISTER_FIELD(name) e ## name |
| #endif // __DARWIN_UNIX03 |
| #else |
| #error Unsupported Mac OS X host architecture. |
| #endif // V8_HOST_ARCH |
| |
| if (thread_get_state(profiled_thread, |
| flavor, |
| reinterpret_cast<natural_t*>(&state), |
| &count) == KERN_SUCCESS) { |
| sample->state = sampler->isolate()->current_vm_state(); |
| sample->pc = reinterpret_cast<Address>(state.REGISTER_FIELD(ip)); |
| sample->sp = reinterpret_cast<Address>(state.REGISTER_FIELD(sp)); |
| sample->fp = reinterpret_cast<Address>(state.REGISTER_FIELD(bp)); |
| sampler->SampleStack(sample); |
| sampler->Tick(sample); |
| } |
| CpuProfiler::FinishTickSampleEvent(sampler->isolate()); |
| thread_resume(profiled_thread); |
| } |
| |
| const int interval_; |
| RuntimeProfilerRateLimiter rate_limiter_; |
| |
| // Protects the process wide state below. |
| static Mutex* mutex_; |
| static SamplerThread* instance_; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(SamplerThread); |
| }; |
| |
| #undef REGISTER_FIELD |
| |
| |
| Mutex* SamplerThread::mutex_ = NULL; |
| SamplerThread* SamplerThread::instance_ = NULL; |
| |
| |
| 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(); |
| SamplerThread::SetUp(); |
| } |
| |
| |
| void OS::TearDown() { |
| SamplerThread::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::DoSample() { |
| // TODO(rogulenko): implement |
| } |
| |
| |
| void Sampler::Start() { |
| ASSERT(!IsActive()); |
| SetActive(true); |
| SamplerThread::AddActiveSampler(this); |
| } |
| |
| |
| void Sampler::Stop() { |
| ASSERT(IsActive()); |
| SamplerThread::RemoveActiveSampler(this); |
| SetActive(false); |
| } |
| |
| |
| void Sampler::StartSampling() { |
| } |
| |
| |
| void Sampler::StopSampling() { |
| } |
| |
| |
| } } // namespace v8::internal |