| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Platform-specific code for POSIX goes here. This is not a platform on its |
| // own, but contains the parts which are the same across the POSIX platforms |
| // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX. |
| |
| #include <errno.h> |
| #include <limits.h> |
| #include <pthread.h> |
| #if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__) |
| #include <pthread_np.h> // for pthread_set_name_np |
| #endif |
| #include <sched.h> // for sched_yield |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include <sys/mman.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #if defined(__APPLE__) || defined(__DragonFly__) || defined(__FreeBSD__) || \ |
| defined(__NetBSD__) || defined(__OpenBSD__) |
| #include <sys/sysctl.h> // NOLINT, for sysctl |
| #endif |
| |
| #undef MAP_TYPE |
| |
| #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) |
| #define LOG_TAG "v8" |
| #include <android/log.h> // NOLINT |
| #endif |
| |
| #include <cmath> |
| #include <cstdlib> |
| |
| #include "src/base/lazy-instance.h" |
| #include "src/base/macros.h" |
| #include "src/base/platform/platform.h" |
| #include "src/base/platform/time.h" |
| #include "src/base/utils/random-number-generator.h" |
| |
| #ifdef V8_FAST_TLS_SUPPORTED |
| #include "src/base/atomicops.h" |
| #endif |
| |
| #if V8_OS_MACOSX |
| #include <dlfcn.h> |
| #endif |
| |
| #if V8_OS_LINUX |
| #include <sys/prctl.h> // NOLINT, for prctl |
| #endif |
| |
| #if !V8_OS_NACL |
| #include <sys/syscall.h> |
| #endif |
| |
| namespace v8 { |
| namespace base { |
| |
| namespace { |
| |
| // 0 is never a valid thread id. |
| const pthread_t kNoThread = (pthread_t) 0; |
| |
| bool g_hard_abort = false; |
| |
| const char* g_gc_fake_mmap = NULL; |
| |
| } // namespace |
| |
| |
| int OS::ActivationFrameAlignment() { |
| #if V8_TARGET_ARCH_ARM |
| // On EABI ARM targets this is required for fp correctness in the |
| // runtime system. |
| return 8; |
| #elif V8_TARGET_ARCH_MIPS |
| return 8; |
| #else |
| // Otherwise we just assume 16 byte alignment, i.e.: |
| // - With gcc 4.4 the tree vectorization optimizer can generate code |
| // that requires 16 byte alignment such as movdqa on x86. |
| // - Mac OS X and Solaris (64-bit) activation frames must be 16 byte-aligned; |
| // see "Mac OS X ABI Function Call Guide" |
| return 16; |
| #endif |
| } |
| |
| |
| intptr_t OS::CommitPageSize() { |
| static intptr_t page_size = getpagesize(); |
| return page_size; |
| } |
| |
| |
| 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); |
| DCHECK(result == 0); |
| } |
| |
| |
| // Get rid of writable permission on code allocations. |
| void OS::ProtectCode(void* address, const size_t size) { |
| #if V8_OS_CYGWIN |
| DWORD old_protect; |
| VirtualProtect(address, size, PAGE_EXECUTE_READ, &old_protect); |
| #elif V8_OS_NACL |
| // The Native Client port of V8 uses an interpreter, so |
| // code pages don't need PROT_EXEC. |
| mprotect(address, size, PROT_READ); |
| #else |
| mprotect(address, size, PROT_READ | PROT_EXEC); |
| #endif |
| } |
| |
| |
| // Create guard pages. |
| void OS::Guard(void* address, const size_t size) { |
| #if V8_OS_CYGWIN |
| DWORD oldprotect; |
| VirtualProtect(address, size, PAGE_NOACCESS, &oldprotect); |
| #else |
| mprotect(address, size, PROT_NONE); |
| #endif |
| } |
| |
| |
| static LazyInstance<RandomNumberGenerator>::type |
| platform_random_number_generator = LAZY_INSTANCE_INITIALIZER; |
| |
| |
| void OS::Initialize(int64_t random_seed, bool hard_abort, |
| const char* const gc_fake_mmap) { |
| if (random_seed) { |
| platform_random_number_generator.Pointer()->SetSeed(random_seed); |
| } |
| g_hard_abort = hard_abort; |
| g_gc_fake_mmap = gc_fake_mmap; |
| } |
| |
| |
| const char* OS::GetGCFakeMMapFile() { |
| return g_gc_fake_mmap; |
| } |
| |
| |
| void* OS::GetRandomMmapAddr() { |
| #if V8_OS_NACL |
| // TODO(bradchen): restore randomization once Native Client gets |
| // smarter about using mmap address hints. |
| // See http://code.google.com/p/nativeclient/issues/3341 |
| return NULL; |
| #endif |
| #if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \ |
| defined(THREAD_SANITIZER) |
| // Dynamic tools do not support custom mmap addresses. |
| return NULL; |
| #endif |
| uintptr_t raw_addr; |
| platform_random_number_generator.Pointer()->NextBytes(&raw_addr, |
| sizeof(raw_addr)); |
| #if V8_TARGET_ARCH_X64 |
| // 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 |
| raw_addr &= 0x3ffff000; |
| |
| # ifdef __sun |
| // For our Solaris/illumos mmap hint, we pick a random address in the bottom |
| // half of the top half of the address space (that is, the third quarter). |
| // Because we do not MAP_FIXED, this will be treated only as a hint -- the |
| // system will not fail to mmap() because something else happens to already |
| // be mapped at our random address. We deliberately set the hint high enough |
| // to get well above the system's break (that is, the heap); Solaris and |
| // illumos will try the hint and if that fails allocate as if there were |
| // no hint at all. The high hint prevents the break from getting hemmed in |
| // at low values, ceding half of the address space to the system heap. |
| raw_addr += 0x80000000; |
| # else |
| // The range 0x20000000 - 0x60000000 is relatively unpopulated across a |
| // variety of ASLR modes (PAE kernel, NX compat mode, etc) and on macos |
| // 10.6 and 10.7. |
| raw_addr += 0x20000000; |
| # endif |
| #endif |
| return reinterpret_cast<void*>(raw_addr); |
| } |
| |
| |
| size_t OS::AllocateAlignment() { |
| return static_cast<size_t>(sysconf(_SC_PAGESIZE)); |
| } |
| |
| |
| void OS::Sleep(int milliseconds) { |
| useconds_t ms = static_cast<useconds_t>(milliseconds); |
| usleep(1000 * ms); |
| } |
| |
| |
| void OS::Abort() { |
| if (g_hard_abort) { |
| V8_IMMEDIATE_CRASH(); |
| } |
| // Redirect to std abort to signal abnormal program termination. |
| abort(); |
| } |
| |
| |
| void OS::DebugBreak() { |
| #if V8_HOST_ARCH_ARM |
| asm("bkpt 0"); |
| #elif V8_HOST_ARCH_ARM64 |
| asm("brk 0"); |
| #elif V8_HOST_ARCH_MIPS |
| asm("break"); |
| #elif V8_HOST_ARCH_MIPS64 |
| asm("break"); |
| #elif V8_HOST_ARCH_IA32 |
| #if V8_OS_NACL |
| asm("hlt"); |
| #else |
| asm("int $3"); |
| #endif // V8_OS_NACL |
| #elif V8_HOST_ARCH_X64 |
| asm("int $3"); |
| #else |
| #error Unsupported host architecture. |
| #endif |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Math functions |
| |
| double OS::nan_value() { |
| // NAN from math.h is defined in C99 and not in POSIX. |
| return NAN; |
| } |
| |
| |
| int OS::GetCurrentProcessId() { |
| return static_cast<int>(getpid()); |
| } |
| |
| |
| int OS::GetCurrentThreadId() { |
| #if defined(ANDROID) |
| #if defined(__APPLE__) |
| uint64_t owner; |
| pthread_threadid_np(NULL, &owner); // Requires Mac OS 10.6 |
| return owner; |
| #else |
| return static_cast<int>(syscall(__NR_gettid)); |
| #endif |
| #elif defined(SYS_gettid) |
| return static_cast<int>(syscall(SYS_gettid)); |
| #else |
| // PNaCL doesn't have a way to get an integral thread ID, but it doesn't |
| // really matter, because we only need it in PerfJitLogger::LogRecordedBuffer. |
| return 0; |
| #endif |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // POSIX date/time support. |
| // |
| |
| int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) { |
| #if V8_OS_NACL |
| // Optionally used in Logger::ResourceEvent. |
| return -1; |
| #else |
| struct rusage usage; |
| |
| if (getrusage(RUSAGE_SELF, &usage) < 0) return -1; |
| *secs = usage.ru_utime.tv_sec; |
| *usecs = usage.ru_utime.tv_usec; |
| return 0; |
| #endif |
| } |
| |
| |
| double OS::TimeCurrentMillis() { |
| return Time::Now().ToJsTime(); |
| } |
| |
| |
| class TimezoneCache {}; |
| |
| |
| TimezoneCache* OS::CreateTimezoneCache() { |
| return NULL; |
| } |
| |
| |
| void OS::DisposeTimezoneCache(TimezoneCache* cache) { |
| DCHECK(cache == NULL); |
| } |
| |
| |
| void OS::ClearTimezoneCache(TimezoneCache* cache) { |
| DCHECK(cache == NULL); |
| } |
| |
| |
| double OS::DaylightSavingsOffset(double time, TimezoneCache*) { |
| if (std::isnan(time)) return nan_value(); |
| time_t tv = static_cast<time_t>(std::floor(time/msPerSecond)); |
| struct tm* t = localtime(&tv); |
| if (NULL == t) return nan_value(); |
| return t->tm_isdst > 0 ? 3600 * msPerSecond : 0; |
| } |
| |
| |
| int OS::GetLastError() { |
| return errno; |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // POSIX stdio support. |
| // |
| |
| FILE* OS::FOpen(const char* path, const char* mode) { |
| FILE* file = fopen(path, mode); |
| if (file == NULL) return NULL; |
| struct stat file_stat; |
| if (fstat(fileno(file), &file_stat) != 0) return NULL; |
| bool is_regular_file = ((file_stat.st_mode & S_IFREG) != 0); |
| if (is_regular_file) return file; |
| fclose(file); |
| return NULL; |
| } |
| |
| |
| bool OS::Remove(const char* path) { |
| return (remove(path) == 0); |
| } |
| |
| |
| FILE* OS::OpenTemporaryFile() { |
| return tmpfile(); |
| } |
| |
| |
| const char* const OS::LogFileOpenMode = "w"; |
| |
| |
| void OS::Print(const char* format, ...) { |
| va_list args; |
| va_start(args, format); |
| VPrint(format, args); |
| va_end(args); |
| } |
| |
| |
| void OS::VPrint(const char* format, va_list args) { |
| #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) |
| __android_log_vprint(ANDROID_LOG_INFO, LOG_TAG, format, args); |
| #else |
| vprintf(format, args); |
| #endif |
| } |
| |
| |
| void OS::FPrint(FILE* out, const char* format, ...) { |
| va_list args; |
| va_start(args, format); |
| VFPrint(out, format, args); |
| va_end(args); |
| } |
| |
| |
| void OS::VFPrint(FILE* out, const char* format, va_list args) { |
| #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) |
| __android_log_vprint(ANDROID_LOG_INFO, LOG_TAG, format, args); |
| #else |
| vfprintf(out, format, args); |
| #endif |
| } |
| |
| |
| void OS::PrintError(const char* format, ...) { |
| va_list args; |
| va_start(args, format); |
| VPrintError(format, args); |
| va_end(args); |
| } |
| |
| |
| void OS::VPrintError(const char* format, va_list args) { |
| #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) |
| __android_log_vprint(ANDROID_LOG_ERROR, LOG_TAG, format, args); |
| #else |
| vfprintf(stderr, format, args); |
| #endif |
| } |
| |
| |
| int OS::SNPrintF(char* str, int length, const char* format, ...) { |
| va_list args; |
| va_start(args, format); |
| int result = VSNPrintF(str, length, format, args); |
| va_end(args); |
| return result; |
| } |
| |
| |
| int OS::VSNPrintF(char* str, |
| int length, |
| const char* format, |
| va_list args) { |
| int n = vsnprintf(str, length, format, args); |
| if (n < 0 || n >= length) { |
| // If the length is zero, the assignment fails. |
| if (length > 0) |
| str[length - 1] = '\0'; |
| return -1; |
| } else { |
| return n; |
| } |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // POSIX string support. |
| // |
| |
| char* OS::StrChr(char* str, int c) { |
| return strchr(str, c); |
| } |
| |
| |
| void OS::StrNCpy(char* dest, int length, const char* src, size_t n) { |
| strncpy(dest, src, n); |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // POSIX thread support. |
| // |
| |
| class Thread::PlatformData { |
| public: |
| PlatformData() : thread_(kNoThread) {} |
| pthread_t thread_; // Thread handle for pthread. |
| // Synchronizes thread creation |
| Mutex thread_creation_mutex_; |
| }; |
| |
| Thread::Thread(const Options& options) |
| : data_(new PlatformData), |
| stack_size_(options.stack_size()), |
| start_semaphore_(NULL) { |
| if (stack_size_ > 0 && static_cast<size_t>(stack_size_) < PTHREAD_STACK_MIN) { |
| stack_size_ = PTHREAD_STACK_MIN; |
| } |
| set_name(options.name()); |
| } |
| |
| |
| Thread::~Thread() { |
| delete data_; |
| } |
| |
| |
| static void SetThreadName(const char* name) { |
| #if V8_OS_DRAGONFLYBSD || V8_OS_FREEBSD || V8_OS_OPENBSD |
| pthread_set_name_np(pthread_self(), name); |
| #elif V8_OS_NETBSD |
| STATIC_ASSERT(Thread::kMaxThreadNameLength <= PTHREAD_MAX_NAMELEN_NP); |
| pthread_setname_np(pthread_self(), "%s", name); |
| #elif V8_OS_MACOSX |
| // 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 == NULL) |
| return; |
| |
| // Mac OS X does not expose the length limit of the name, so hardcode it. |
| static const int kMaxNameLength = 63; |
| STATIC_ASSERT(Thread::kMaxThreadNameLength <= kMaxNameLength); |
| dynamic_pthread_setname_np(name); |
| #elif defined(PR_SET_NAME) |
| prctl(PR_SET_NAME, |
| reinterpret_cast<unsigned long>(name), // NOLINT |
| 0, 0, 0); |
| #endif |
| } |
| |
| |
| static void* ThreadEntry(void* arg) { |
| Thread* thread = reinterpret_cast<Thread*>(arg); |
| // We take the lock here to make sure that pthread_create finished first since |
| // we don't know which thread will run first (the original thread or the new |
| // one). |
| { LockGuard<Mutex> lock_guard(&thread->data()->thread_creation_mutex_); } |
| SetThreadName(thread->name()); |
| DCHECK(thread->data()->thread_ != kNoThread); |
| thread->NotifyStartedAndRun(); |
| return NULL; |
| } |
| |
| |
| void Thread::set_name(const char* name) { |
| strncpy(name_, name, sizeof(name_)); |
| name_[sizeof(name_) - 1] = '\0'; |
| } |
| |
| |
| void Thread::Start() { |
| int result; |
| pthread_attr_t attr; |
| memset(&attr, 0, sizeof(attr)); |
| result = pthread_attr_init(&attr); |
| DCHECK_EQ(0, result); |
| // Native client uses default stack size. |
| #if !V8_OS_NACL |
| if (stack_size_ > 0) { |
| result = pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_)); |
| DCHECK_EQ(0, result); |
| } |
| #endif |
| { |
| LockGuard<Mutex> lock_guard(&data_->thread_creation_mutex_); |
| result = pthread_create(&data_->thread_, &attr, ThreadEntry, this); |
| } |
| DCHECK_EQ(0, result); |
| result = pthread_attr_destroy(&attr); |
| DCHECK_EQ(0, result); |
| DCHECK(data_->thread_ != kNoThread); |
| USE(result); |
| } |
| |
| |
| void Thread::Join() { |
| pthread_join(data_->thread_, NULL); |
| } |
| |
| |
| void Thread::YieldCPU() { |
| int result = sched_yield(); |
| DCHECK_EQ(0, result); |
| USE(result); |
| } |
| |
| |
| static Thread::LocalStorageKey PthreadKeyToLocalKey(pthread_key_t pthread_key) { |
| #if V8_OS_CYGWIN |
| // We need to cast pthread_key_t to Thread::LocalStorageKey in two steps |
| // because pthread_key_t is a pointer type on Cygwin. This will probably not |
| // work on 64-bit platforms, but Cygwin doesn't support 64-bit anyway. |
| STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t)); |
| intptr_t ptr_key = reinterpret_cast<intptr_t>(pthread_key); |
| return static_cast<Thread::LocalStorageKey>(ptr_key); |
| #else |
| return static_cast<Thread::LocalStorageKey>(pthread_key); |
| #endif |
| } |
| |
| |
| static pthread_key_t LocalKeyToPthreadKey(Thread::LocalStorageKey local_key) { |
| #if V8_OS_CYGWIN |
| STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t)); |
| intptr_t ptr_key = static_cast<intptr_t>(local_key); |
| return reinterpret_cast<pthread_key_t>(ptr_key); |
| #else |
| return static_cast<pthread_key_t>(local_key); |
| #endif |
| } |
| |
| |
| #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 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); |
| DCHECK_EQ(0, result); |
| USE(result); |
| LocalStorageKey local_key = PthreadKeyToLocalKey(key); |
| #ifdef V8_FAST_TLS_SUPPORTED |
| // If we just initialized fast TLS support, make sure it works. |
| if (check_fast_tls) CheckFastTls(local_key); |
| #endif |
| return local_key; |
| } |
| |
| |
| void Thread::DeleteThreadLocalKey(LocalStorageKey key) { |
| pthread_key_t pthread_key = LocalKeyToPthreadKey(key); |
| int result = pthread_key_delete(pthread_key); |
| DCHECK_EQ(0, result); |
| USE(result); |
| } |
| |
| |
| void* Thread::GetThreadLocal(LocalStorageKey key) { |
| pthread_key_t pthread_key = LocalKeyToPthreadKey(key); |
| return pthread_getspecific(pthread_key); |
| } |
| |
| |
| void Thread::SetThreadLocal(LocalStorageKey key, void* value) { |
| pthread_key_t pthread_key = LocalKeyToPthreadKey(key); |
| int result = pthread_setspecific(pthread_key, value); |
| DCHECK_EQ(0, result); |
| USE(result); |
| } |
| |
| |
| } } // namespace v8::base |