| // 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 <stdio.h> |
| #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 |
| |
| #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/platform/platform-posix.h" |
| |
| #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 !defined(_AIX) && !defined(V8_OS_FUCHSIA) |
| #include <sys/syscall.h> |
| #endif |
| |
| #if V8_OS_FREEBSD || V8_OS_MACOSX || V8_OS_OPENBSD || V8_OS_SOLARIS |
| #define MAP_ANONYMOUS MAP_ANON |
| #endif |
| |
| #if defined(V8_OS_SOLARIS) |
| #if (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE > 2) || defined(__EXTENSIONS__) |
| extern "C" int madvise(caddr_t, size_t, int); |
| #else |
| extern int madvise(caddr_t, size_t, int); |
| #endif |
| #endif |
| |
| #ifndef MADV_FREE |
| #define MADV_FREE MADV_DONTNEED |
| #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 = nullptr; |
| |
| static LazyInstance<RandomNumberGenerator>::type |
| platform_random_number_generator = LAZY_INSTANCE_INITIALIZER; |
| static LazyMutex rng_mutex = LAZY_MUTEX_INITIALIZER; |
| |
| #if !V8_OS_FUCHSIA |
| #if V8_OS_MACOSX |
| // 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). |
| const int kMmapFd = VM_MAKE_TAG(255); |
| #else // !V8_OS_MACOSX |
| const int kMmapFd = -1; |
| #endif // !V8_OS_MACOSX |
| |
| const int kMmapFdOffset = 0; |
| |
| int GetProtectionFromMemoryPermission(OS::MemoryPermission access) { |
| switch (access) { |
| case OS::MemoryPermission::kNoAccess: |
| return PROT_NONE; |
| case OS::MemoryPermission::kReadWrite: |
| return PROT_READ | PROT_WRITE; |
| case OS::MemoryPermission::kReadWriteExecute: |
| return PROT_READ | PROT_WRITE | PROT_EXEC; |
| case OS::MemoryPermission::kReadExecute: |
| return PROT_READ | PROT_EXEC; |
| } |
| UNREACHABLE(); |
| } |
| |
| int GetFlagsForMemoryPermission(OS::MemoryPermission access) { |
| int flags = MAP_PRIVATE | MAP_ANONYMOUS; |
| if (access == OS::MemoryPermission::kNoAccess) { |
| #if !V8_OS_AIX && !V8_OS_FREEBSD && !V8_OS_QNX |
| flags |= MAP_NORESERVE; |
| #endif // !V8_OS_AIX && !V8_OS_FREEBSD && !V8_OS_QNX |
| #if V8_OS_QNX |
| flags |= MAP_LAZY; |
| #endif // V8_OS_QNX |
| } |
| return flags; |
| } |
| |
| void* Allocate(void* address, size_t size, OS::MemoryPermission access) { |
| int prot = GetProtectionFromMemoryPermission(access); |
| int flags = GetFlagsForMemoryPermission(access); |
| void* result = mmap(address, size, prot, flags, kMmapFd, kMmapFdOffset); |
| if (result == MAP_FAILED) return nullptr; |
| return result; |
| } |
| |
| int ReclaimInaccessibleMemory(void* address, size_t size) { |
| #if defined(OS_MACOSX) |
| // On OSX, MADV_FREE_REUSABLE has comparable behavior to MADV_FREE, but also |
| // marks the pages with the reusable bit, which allows both Activity Monitor |
| // and memory-infra to correctly track the pages. |
| int ret = madvise(address, size, MADV_FREE_REUSABLE); |
| #elif defined(_AIX) || defined(V8_OS_SOLARIS) |
| int ret = madvise(reinterpret_cast<caddr_t>(address), size, MADV_FREE); |
| #else |
| int ret = madvise(address, size, MADV_FREE); |
| #endif |
| if (ret != 0 && errno == EINVAL) { |
| // MADV_FREE only works on Linux 4.5+ . If request failed, retry with older |
| // MADV_DONTNEED . Note that MADV_FREE being defined at compile time doesn't |
| // imply runtime support. |
| #if defined(_AIX) || defined(V8_OS_SOLARIS) |
| ret = madvise(reinterpret_cast<caddr_t>(address), size, MADV_DONTNEED); |
| #else |
| ret = madvise(address, size, MADV_DONTNEED); |
| #endif |
| } |
| return ret; |
| } |
| |
| #endif // !V8_OS_FUCHSIA |
| |
| } // namespace |
| |
| void OS::Initialize(bool hard_abort, const char* const gc_fake_mmap) { |
| g_hard_abort = hard_abort; |
| g_gc_fake_mmap = gc_fake_mmap; |
| } |
| |
| 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; |
| #elif V8_TARGET_ARCH_S390 |
| 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, PPC and Solaris (64-bit) activation frames must |
| // be 16 byte-aligned; see "Mac OS X ABI Function Call Guide" |
| return 16; |
| #endif |
| } |
| |
| // static |
| size_t OS::AllocatePageSize() { |
| return static_cast<size_t>(sysconf(_SC_PAGESIZE)); |
| } |
| |
| // static |
| size_t OS::CommitPageSize() { |
| static size_t page_size = getpagesize(); |
| return page_size; |
| } |
| |
| // static |
| void OS::SetRandomMmapSeed(int64_t seed) { |
| if (seed) { |
| LockGuard<Mutex> guard(rng_mutex.Pointer()); |
| platform_random_number_generator.Pointer()->SetSeed(seed); |
| } |
| } |
| |
| // static |
| void* OS::GetRandomMmapAddr() { |
| uintptr_t raw_addr; |
| { |
| LockGuard<Mutex> guard(rng_mutex.Pointer()); |
| platform_random_number_generator.Pointer()->NextBytes(&raw_addr, |
| sizeof(raw_addr)); |
| } |
| #if defined(V8_USE_ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \ |
| defined(THREAD_SANITIZER) || defined(LEAK_SANITIZER) |
| // If random hint addresses interfere with address ranges hard coded in |
| // sanitizers, bad things happen. This address range is copied from TSAN |
| // source but works with all tools. |
| // See crbug.com/539863. |
| raw_addr &= 0x007fffff0000ULL; |
| raw_addr += 0x7e8000000000ULL; |
| #else |
| #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 &= uint64_t{0x3FFFFFFFF000}; |
| #elif V8_TARGET_ARCH_PPC64 |
| #if V8_OS_AIX |
| // AIX: 64 bits of virtual addressing, but we limit address range to: |
| // a) minimize Segment Lookaside Buffer (SLB) misses and |
| raw_addr &= uint64_t{0x3FFFF000}; |
| // Use extra address space to isolate the mmap regions. |
| raw_addr += uint64_t{0x400000000000}; |
| #elif V8_TARGET_BIG_ENDIAN |
| // Big-endian Linux: 44 bits of virtual addressing. |
| raw_addr &= uint64_t{0x03FFFFFFF000}; |
| #else |
| // Little-endian Linux: 48 bits of virtual addressing. |
| raw_addr &= uint64_t{0x3FFFFFFFF000}; |
| #endif |
| #elif V8_TARGET_ARCH_S390X |
| // Linux on Z uses bits 22-32 for Region Indexing, which translates to 42 bits |
| // of virtual addressing. Truncate to 40 bits to allow kernel chance to |
| // fulfill request. |
| raw_addr &= uint64_t{0xFFFFFFF000}; |
| #elif V8_TARGET_ARCH_S390 |
| // 31 bits of virtual addressing. Truncate to 29 bits to allow kernel chance |
| // to fulfill request. |
| raw_addr &= 0x1FFFF000; |
| #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; |
| #elif V8_OS_AIX |
| // The range 0x30000000 - 0xD0000000 is available on AIX; |
| // choose the upper range. |
| raw_addr += 0x90000000; |
| #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 |
| #endif |
| return reinterpret_cast<void*>(raw_addr); |
| } |
| |
| // TODO(bbudge) Move Cygwin and Fuschia stuff into platform-specific files. |
| #if !V8_OS_CYGWIN && !V8_OS_FUCHSIA |
| // static |
| void* OS::Allocate(void* address, size_t size, size_t alignment, |
| MemoryPermission access) { |
| size_t page_size = AllocatePageSize(); |
| DCHECK_EQ(0, size % page_size); |
| DCHECK_EQ(0, alignment % page_size); |
| address = AlignedAddress(address, alignment); |
| // Add the maximum misalignment so we are guaranteed an aligned base address. |
| size_t request_size = size + (alignment - page_size); |
| request_size = RoundUp(request_size, OS::AllocatePageSize()); |
| void* result = base::Allocate(address, request_size, access); |
| if (result == nullptr) return nullptr; |
| |
| // Unmap memory allocated before the aligned base address. |
| uint8_t* base = static_cast<uint8_t*>(result); |
| uint8_t* aligned_base = RoundUp(base, alignment); |
| if (aligned_base != base) { |
| DCHECK_LT(base, aligned_base); |
| size_t prefix_size = static_cast<size_t>(aligned_base - base); |
| CHECK(Free(base, prefix_size)); |
| request_size -= prefix_size; |
| } |
| // Unmap memory allocated after the potentially unaligned end. |
| if (size != request_size) { |
| DCHECK_LT(size, request_size); |
| size_t suffix_size = request_size - size; |
| CHECK(Free(aligned_base + size, suffix_size)); |
| request_size -= suffix_size; |
| } |
| |
| DCHECK_EQ(size, request_size); |
| return static_cast<void*>(aligned_base); |
| } |
| |
| // static |
| bool OS::Free(void* address, const size_t size) { |
| DCHECK_EQ(0, reinterpret_cast<uintptr_t>(address) % AllocatePageSize()); |
| DCHECK_EQ(0, size % AllocatePageSize()); |
| return munmap(address, size) == 0; |
| } |
| |
| // static |
| bool OS::Release(void* address, size_t size) { |
| DCHECK_EQ(0, reinterpret_cast<uintptr_t>(address) % CommitPageSize()); |
| DCHECK_EQ(0, size % CommitPageSize()); |
| return munmap(address, size) == 0; |
| } |
| |
| // static |
| bool OS::SetPermissions(void* address, size_t size, MemoryPermission access) { |
| DCHECK_EQ(0, reinterpret_cast<uintptr_t>(address) % CommitPageSize()); |
| DCHECK_EQ(0, size % CommitPageSize()); |
| |
| int prot = GetProtectionFromMemoryPermission(access); |
| int ret = mprotect(address, size, prot); |
| if (ret == 0 && access == OS::MemoryPermission::kNoAccess) { |
| ret = ReclaimInaccessibleMemory(address, size); |
| } |
| return ret == 0; |
| } |
| |
| // static |
| bool OS::HasLazyCommits() { |
| #if V8_OS_AIX || V8_OS_LINUX || V8_OS_MACOSX |
| return true; |
| #else |
| // TODO(bbudge) Return true for all POSIX platforms. |
| return false; |
| #endif |
| } |
| #endif // !V8_OS_CYGWIN && !V8_OS_FUCHSIA |
| |
| const char* OS::GetGCFakeMMapFile() { |
| return g_gc_fake_mmap; |
| } |
| |
| |
| void OS::Sleep(TimeDelta interval) { |
| usleep(static_cast<useconds_t>(interval.InMicroseconds())); |
| } |
| |
| |
| 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_PPC |
| asm("twge 2,2"); |
| #elif V8_HOST_ARCH_IA32 |
| asm("int $3"); |
| #elif V8_HOST_ARCH_X64 |
| asm("int $3"); |
| #elif V8_HOST_ARCH_S390 |
| // Software breakpoint instruction is 0x0001 |
| asm volatile(".word 0x0001"); |
| #else |
| #error Unsupported host architecture. |
| #endif |
| } |
| |
| |
| class PosixMemoryMappedFile final : public OS::MemoryMappedFile { |
| public: |
| PosixMemoryMappedFile(FILE* file, void* memory, size_t size) |
| : file_(file), memory_(memory), size_(size) {} |
| ~PosixMemoryMappedFile() final; |
| void* memory() const final { return memory_; } |
| size_t size() const final { return size_; } |
| |
| private: |
| FILE* const file_; |
| void* const memory_; |
| size_t const size_; |
| }; |
| |
| |
| // static |
| OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { |
| if (FILE* file = fopen(name, "r+")) { |
| if (fseek(file, 0, SEEK_END) == 0) { |
| long size = ftell(file); // NOLINT(runtime/int) |
| if (size >= 0) { |
| void* const memory = |
| mmap(OS::GetRandomMmapAddr(), size, PROT_READ | PROT_WRITE, |
| MAP_SHARED, fileno(file), 0); |
| if (memory != MAP_FAILED) { |
| return new PosixMemoryMappedFile(file, memory, size); |
| } |
| } |
| } |
| fclose(file); |
| } |
| return nullptr; |
| } |
| |
| |
| // static |
| OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, |
| size_t size, void* initial) { |
| if (FILE* file = fopen(name, "w+")) { |
| size_t result = fwrite(initial, 1, size, file); |
| if (result == size && !ferror(file)) { |
| void* memory = mmap(OS::GetRandomMmapAddr(), result, |
| PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); |
| if (memory != MAP_FAILED) { |
| return new PosixMemoryMappedFile(file, memory, result); |
| } |
| } |
| fclose(file); |
| } |
| return nullptr; |
| } |
| |
| |
| PosixMemoryMappedFile::~PosixMemoryMappedFile() { |
| if (memory_) CHECK(OS::Free(memory_, size_)); |
| fclose(file_); |
| } |
| |
| |
| int OS::GetCurrentProcessId() { |
| return static_cast<int>(getpid()); |
| } |
| |
| |
| int OS::GetCurrentThreadId() { |
| #if V8_OS_MACOSX || (V8_OS_ANDROID && defined(__APPLE__)) |
| return static_cast<int>(pthread_mach_thread_np(pthread_self())); |
| #elif V8_OS_LINUX |
| return static_cast<int>(syscall(__NR_gettid)); |
| #elif V8_OS_ANDROID |
| return static_cast<int>(gettid()); |
| #elif V8_OS_AIX |
| return static_cast<int>(thread_self()); |
| #elif V8_OS_FUCHSIA |
| return static_cast<int>(pthread_self()); |
| #elif V8_OS_SOLARIS |
| return static_cast<int>(pthread_self()); |
| #else |
| return static_cast<int>(reinterpret_cast<intptr_t>(pthread_self())); |
| #endif |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // POSIX date/time support. |
| // |
| |
| int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) { |
| struct rusage usage; |
| |
| if (getrusage(RUSAGE_SELF, &usage) < 0) return -1; |
| *secs = static_cast<uint32_t>(usage.ru_utime.tv_sec); |
| *usecs = static_cast<uint32_t>(usage.ru_utime.tv_usec); |
| return 0; |
| } |
| |
| |
| double OS::TimeCurrentMillis() { |
| return Time::Now().ToJsTime(); |
| } |
| |
| double PosixTimezoneCache::DaylightSavingsOffset(double time) { |
| if (std::isnan(time)) return std::numeric_limits<double>::quiet_NaN(); |
| time_t tv = static_cast<time_t>(std::floor(time/msPerSecond)); |
| struct tm tm; |
| struct tm* t = localtime_r(&tv, &tm); |
| if (nullptr == t) return std::numeric_limits<double>::quiet_NaN(); |
| 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 == nullptr) return nullptr; |
| struct stat file_stat; |
| if (fstat(fileno(file), &file_stat) != 0) { |
| fclose(file); |
| return nullptr; |
| } |
| bool is_regular_file = ((file_stat.st_mode & S_IFREG) != 0); |
| if (is_regular_file) return file; |
| fclose(file); |
| return nullptr; |
| } |
| |
| |
| bool OS::Remove(const char* path) { |
| return (remove(path) == 0); |
| } |
| |
| char OS::DirectorySeparator() { return '/'; } |
| |
| bool OS::isDirectorySeparator(const char ch) { |
| return ch == DirectorySeparator(); |
| } |
| |
| |
| 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_(nullptr) { |
| 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 == nullptr) 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_NE(thread->data()->thread_, kNoThread); |
| thread->NotifyStartedAndRun(); |
| return nullptr; |
| } |
| |
| |
| 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); |
| size_t stack_size = stack_size_; |
| if (stack_size == 0) { |
| #if V8_OS_MACOSX |
| // Default on Mac OS X is 512kB -- bump up to 1MB |
| stack_size = 1 * 1024 * 1024; |
| #elif V8_OS_AIX |
| // Default on AIX is 96kB -- bump up to 2MB |
| stack_size = 2 * 1024 * 1024; |
| #endif |
| } |
| if (stack_size > 0) { |
| result = pthread_attr_setstacksize(&attr, stack_size); |
| DCHECK_EQ(0, result); |
| } |
| { |
| 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_NE(data_->thread_, kNoThread); |
| USE(result); |
| } |
| |
| void Thread::Join() { pthread_join(data_->thread_, nullptr); } |
| |
| 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, nullptr, 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, nullptr, 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, nullptr); |
| } |
| |
| #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, nullptr); |
| 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); |
| } |
| |
| #undef LOG_TAG |
| #undef MAP_ANONYMOUS |
| #undef MADV_FREE |
| |
| } // namespace base |
| } // namespace v8 |