Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Platform-specific code for POSIX goes here. This is not a platform on its |
| 6 | // own, but contains the parts which are the same across the POSIX platforms |
| 7 | // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX. |
| 8 | |
| 9 | #include <errno.h> |
| 10 | #include <limits.h> |
| 11 | #include <pthread.h> |
| 12 | #if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__) |
| 13 | #include <pthread_np.h> // for pthread_set_name_np |
| 14 | #endif |
| 15 | #include <sched.h> // for sched_yield |
| 16 | #include <time.h> |
| 17 | #include <unistd.h> |
| 18 | |
| 19 | #include <sys/mman.h> |
| 20 | #include <sys/resource.h> |
| 21 | #include <sys/stat.h> |
| 22 | #include <sys/time.h> |
| 23 | #include <sys/types.h> |
| 24 | #if defined(__APPLE__) || defined(__DragonFly__) || defined(__FreeBSD__) || \ |
| 25 | defined(__NetBSD__) || defined(__OpenBSD__) |
| 26 | #include <sys/sysctl.h> // NOLINT, for sysctl |
| 27 | #endif |
| 28 | |
| 29 | #undef MAP_TYPE |
| 30 | |
| 31 | #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) |
| 32 | #define LOG_TAG "v8" |
| 33 | #include <android/log.h> // NOLINT |
| 34 | #endif |
| 35 | |
| 36 | #include <cmath> |
| 37 | #include <cstdlib> |
| 38 | |
| 39 | #include "src/base/lazy-instance.h" |
| 40 | #include "src/base/macros.h" |
| 41 | #include "src/base/platform/platform.h" |
| 42 | #include "src/base/platform/time.h" |
| 43 | #include "src/base/utils/random-number-generator.h" |
| 44 | |
| 45 | #ifdef V8_FAST_TLS_SUPPORTED |
| 46 | #include "src/base/atomicops.h" |
| 47 | #endif |
| 48 | |
| 49 | #if V8_OS_MACOSX |
| 50 | #include <dlfcn.h> |
| 51 | #endif |
| 52 | |
| 53 | #if V8_OS_LINUX |
| 54 | #include <sys/prctl.h> // NOLINT, for prctl |
| 55 | #endif |
| 56 | |
| 57 | #if !V8_OS_NACL |
| 58 | #include <sys/syscall.h> |
| 59 | #endif |
| 60 | |
| 61 | namespace v8 { |
| 62 | namespace base { |
| 63 | |
| 64 | namespace { |
| 65 | |
| 66 | // 0 is never a valid thread id. |
| 67 | const pthread_t kNoThread = (pthread_t) 0; |
| 68 | |
| 69 | bool g_hard_abort = false; |
| 70 | |
| 71 | const char* g_gc_fake_mmap = NULL; |
| 72 | |
| 73 | } // namespace |
| 74 | |
| 75 | |
| 76 | int OS::ActivationFrameAlignment() { |
| 77 | #if V8_TARGET_ARCH_ARM |
| 78 | // On EABI ARM targets this is required for fp correctness in the |
| 79 | // runtime system. |
| 80 | return 8; |
| 81 | #elif V8_TARGET_ARCH_MIPS |
| 82 | return 8; |
| 83 | #else |
| 84 | // Otherwise we just assume 16 byte alignment, i.e.: |
| 85 | // - With gcc 4.4 the tree vectorization optimizer can generate code |
| 86 | // that requires 16 byte alignment such as movdqa on x86. |
| 87 | // - Mac OS X and Solaris (64-bit) activation frames must be 16 byte-aligned; |
| 88 | // see "Mac OS X ABI Function Call Guide" |
| 89 | return 16; |
| 90 | #endif |
| 91 | } |
| 92 | |
| 93 | |
| 94 | intptr_t OS::CommitPageSize() { |
| 95 | static intptr_t page_size = getpagesize(); |
| 96 | return page_size; |
| 97 | } |
| 98 | |
| 99 | |
| 100 | void OS::Free(void* address, const size_t size) { |
| 101 | // TODO(1240712): munmap has a return value which is ignored here. |
| 102 | int result = munmap(address, size); |
| 103 | USE(result); |
| 104 | DCHECK(result == 0); |
| 105 | } |
| 106 | |
| 107 | |
| 108 | // Get rid of writable permission on code allocations. |
| 109 | void OS::ProtectCode(void* address, const size_t size) { |
| 110 | #if V8_OS_CYGWIN |
| 111 | DWORD old_protect; |
| 112 | VirtualProtect(address, size, PAGE_EXECUTE_READ, &old_protect); |
| 113 | #elif V8_OS_NACL |
| 114 | // The Native Client port of V8 uses an interpreter, so |
| 115 | // code pages don't need PROT_EXEC. |
| 116 | mprotect(address, size, PROT_READ); |
| 117 | #else |
| 118 | mprotect(address, size, PROT_READ | PROT_EXEC); |
| 119 | #endif |
| 120 | } |
| 121 | |
| 122 | |
| 123 | // Create guard pages. |
| 124 | void OS::Guard(void* address, const size_t size) { |
| 125 | #if V8_OS_CYGWIN |
| 126 | DWORD oldprotect; |
| 127 | VirtualProtect(address, size, PAGE_NOACCESS, &oldprotect); |
| 128 | #else |
| 129 | mprotect(address, size, PROT_NONE); |
| 130 | #endif |
| 131 | } |
| 132 | |
| 133 | |
| 134 | static LazyInstance<RandomNumberGenerator>::type |
| 135 | platform_random_number_generator = LAZY_INSTANCE_INITIALIZER; |
| 136 | |
| 137 | |
| 138 | void OS::Initialize(int64_t random_seed, bool hard_abort, |
| 139 | const char* const gc_fake_mmap) { |
| 140 | if (random_seed) { |
| 141 | platform_random_number_generator.Pointer()->SetSeed(random_seed); |
| 142 | } |
| 143 | g_hard_abort = hard_abort; |
| 144 | g_gc_fake_mmap = gc_fake_mmap; |
| 145 | } |
| 146 | |
| 147 | |
| 148 | const char* OS::GetGCFakeMMapFile() { |
| 149 | return g_gc_fake_mmap; |
| 150 | } |
| 151 | |
| 152 | |
| 153 | void* OS::GetRandomMmapAddr() { |
| 154 | #if V8_OS_NACL |
| 155 | // TODO(bradchen): restore randomization once Native Client gets |
| 156 | // smarter about using mmap address hints. |
| 157 | // See http://code.google.com/p/nativeclient/issues/3341 |
| 158 | return NULL; |
| 159 | #endif |
| 160 | #if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \ |
| 161 | defined(THREAD_SANITIZER) |
| 162 | // Dynamic tools do not support custom mmap addresses. |
| 163 | return NULL; |
| 164 | #endif |
| 165 | uintptr_t raw_addr; |
| 166 | platform_random_number_generator.Pointer()->NextBytes(&raw_addr, |
| 167 | sizeof(raw_addr)); |
| 168 | #if V8_TARGET_ARCH_X64 |
| 169 | // Currently available CPUs have 48 bits of virtual addressing. Truncate |
| 170 | // the hint address to 46 bits to give the kernel a fighting chance of |
| 171 | // fulfilling our placement request. |
| 172 | raw_addr &= V8_UINT64_C(0x3ffffffff000); |
| 173 | #else |
| 174 | raw_addr &= 0x3ffff000; |
| 175 | |
| 176 | # ifdef __sun |
| 177 | // For our Solaris/illumos mmap hint, we pick a random address in the bottom |
| 178 | // half of the top half of the address space (that is, the third quarter). |
| 179 | // Because we do not MAP_FIXED, this will be treated only as a hint -- the |
| 180 | // system will not fail to mmap() because something else happens to already |
| 181 | // be mapped at our random address. We deliberately set the hint high enough |
| 182 | // to get well above the system's break (that is, the heap); Solaris and |
| 183 | // illumos will try the hint and if that fails allocate as if there were |
| 184 | // no hint at all. The high hint prevents the break from getting hemmed in |
| 185 | // at low values, ceding half of the address space to the system heap. |
| 186 | raw_addr += 0x80000000; |
| 187 | # else |
| 188 | // The range 0x20000000 - 0x60000000 is relatively unpopulated across a |
| 189 | // variety of ASLR modes (PAE kernel, NX compat mode, etc) and on macos |
| 190 | // 10.6 and 10.7. |
| 191 | raw_addr += 0x20000000; |
| 192 | # endif |
| 193 | #endif |
| 194 | return reinterpret_cast<void*>(raw_addr); |
| 195 | } |
| 196 | |
| 197 | |
| 198 | size_t OS::AllocateAlignment() { |
| 199 | return static_cast<size_t>(sysconf(_SC_PAGESIZE)); |
| 200 | } |
| 201 | |
| 202 | |
| 203 | void OS::Sleep(int milliseconds) { |
| 204 | useconds_t ms = static_cast<useconds_t>(milliseconds); |
| 205 | usleep(1000 * ms); |
| 206 | } |
| 207 | |
| 208 | |
| 209 | void OS::Abort() { |
| 210 | if (g_hard_abort) { |
| 211 | V8_IMMEDIATE_CRASH(); |
| 212 | } |
| 213 | // Redirect to std abort to signal abnormal program termination. |
| 214 | abort(); |
| 215 | } |
| 216 | |
| 217 | |
| 218 | void OS::DebugBreak() { |
| 219 | #if V8_HOST_ARCH_ARM |
| 220 | asm("bkpt 0"); |
| 221 | #elif V8_HOST_ARCH_ARM64 |
| 222 | asm("brk 0"); |
| 223 | #elif V8_HOST_ARCH_MIPS |
| 224 | asm("break"); |
| 225 | #elif V8_HOST_ARCH_MIPS64 |
| 226 | asm("break"); |
| 227 | #elif V8_HOST_ARCH_IA32 |
| 228 | #if V8_OS_NACL |
| 229 | asm("hlt"); |
| 230 | #else |
| 231 | asm("int $3"); |
| 232 | #endif // V8_OS_NACL |
| 233 | #elif V8_HOST_ARCH_X64 |
| 234 | asm("int $3"); |
| 235 | #else |
| 236 | #error Unsupported host architecture. |
| 237 | #endif |
| 238 | } |
| 239 | |
| 240 | |
| 241 | // ---------------------------------------------------------------------------- |
| 242 | // Math functions |
| 243 | |
| 244 | double OS::nan_value() { |
| 245 | // NAN from math.h is defined in C99 and not in POSIX. |
| 246 | return NAN; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | int OS::GetCurrentProcessId() { |
| 251 | return static_cast<int>(getpid()); |
| 252 | } |
| 253 | |
| 254 | |
| 255 | int OS::GetCurrentThreadId() { |
| 256 | #if defined(ANDROID) |
| 257 | return static_cast<int>(syscall(__NR_gettid)); |
| 258 | #elif defined(SYS_gettid) |
| 259 | return static_cast<int>(syscall(SYS_gettid)); |
| 260 | #else |
| 261 | // PNaCL doesn't have a way to get an integral thread ID, but it doesn't |
| 262 | // really matter, because we only need it in PerfJitLogger::LogRecordedBuffer. |
| 263 | return 0; |
| 264 | #endif |
| 265 | } |
| 266 | |
| 267 | |
| 268 | // ---------------------------------------------------------------------------- |
| 269 | // POSIX date/time support. |
| 270 | // |
| 271 | |
| 272 | int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) { |
| 273 | #if V8_OS_NACL |
| 274 | // Optionally used in Logger::ResourceEvent. |
| 275 | return -1; |
| 276 | #else |
| 277 | struct rusage usage; |
| 278 | |
| 279 | if (getrusage(RUSAGE_SELF, &usage) < 0) return -1; |
| 280 | *secs = usage.ru_utime.tv_sec; |
| 281 | *usecs = usage.ru_utime.tv_usec; |
| 282 | return 0; |
| 283 | #endif |
| 284 | } |
| 285 | |
| 286 | |
| 287 | double OS::TimeCurrentMillis() { |
| 288 | return Time::Now().ToJsTime(); |
| 289 | } |
| 290 | |
| 291 | |
| 292 | class TimezoneCache {}; |
| 293 | |
| 294 | |
| 295 | TimezoneCache* OS::CreateTimezoneCache() { |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | |
| 300 | void OS::DisposeTimezoneCache(TimezoneCache* cache) { |
| 301 | DCHECK(cache == NULL); |
| 302 | } |
| 303 | |
| 304 | |
| 305 | void OS::ClearTimezoneCache(TimezoneCache* cache) { |
| 306 | DCHECK(cache == NULL); |
| 307 | } |
| 308 | |
| 309 | |
| 310 | double OS::DaylightSavingsOffset(double time, TimezoneCache*) { |
| 311 | if (std::isnan(time)) return nan_value(); |
| 312 | time_t tv = static_cast<time_t>(std::floor(time/msPerSecond)); |
| 313 | struct tm* t = localtime(&tv); |
| 314 | if (NULL == t) return nan_value(); |
| 315 | return t->tm_isdst > 0 ? 3600 * msPerSecond : 0; |
| 316 | } |
| 317 | |
| 318 | |
| 319 | int OS::GetLastError() { |
| 320 | return errno; |
| 321 | } |
| 322 | |
| 323 | |
| 324 | // ---------------------------------------------------------------------------- |
| 325 | // POSIX stdio support. |
| 326 | // |
| 327 | |
| 328 | FILE* OS::FOpen(const char* path, const char* mode) { |
| 329 | FILE* file = fopen(path, mode); |
| 330 | if (file == NULL) return NULL; |
| 331 | struct stat file_stat; |
| 332 | if (fstat(fileno(file), &file_stat) != 0) return NULL; |
| 333 | bool is_regular_file = ((file_stat.st_mode & S_IFREG) != 0); |
| 334 | if (is_regular_file) return file; |
| 335 | fclose(file); |
| 336 | return NULL; |
| 337 | } |
| 338 | |
| 339 | |
| 340 | bool OS::Remove(const char* path) { |
| 341 | return (remove(path) == 0); |
| 342 | } |
| 343 | |
| 344 | |
| 345 | FILE* OS::OpenTemporaryFile() { |
| 346 | return tmpfile(); |
| 347 | } |
| 348 | |
| 349 | |
| 350 | const char* const OS::LogFileOpenMode = "w"; |
| 351 | |
| 352 | |
| 353 | void OS::Print(const char* format, ...) { |
| 354 | va_list args; |
| 355 | va_start(args, format); |
| 356 | VPrint(format, args); |
| 357 | va_end(args); |
| 358 | } |
| 359 | |
| 360 | |
| 361 | void OS::VPrint(const char* format, va_list args) { |
| 362 | #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) |
| 363 | __android_log_vprint(ANDROID_LOG_INFO, LOG_TAG, format, args); |
| 364 | #else |
| 365 | vprintf(format, args); |
| 366 | #endif |
| 367 | } |
| 368 | |
| 369 | |
| 370 | void OS::FPrint(FILE* out, const char* format, ...) { |
| 371 | va_list args; |
| 372 | va_start(args, format); |
| 373 | VFPrint(out, format, args); |
| 374 | va_end(args); |
| 375 | } |
| 376 | |
| 377 | |
| 378 | void OS::VFPrint(FILE* out, const char* format, va_list args) { |
| 379 | #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) |
| 380 | __android_log_vprint(ANDROID_LOG_INFO, LOG_TAG, format, args); |
| 381 | #else |
| 382 | vfprintf(out, format, args); |
| 383 | #endif |
| 384 | } |
| 385 | |
| 386 | |
| 387 | void OS::PrintError(const char* format, ...) { |
| 388 | va_list args; |
| 389 | va_start(args, format); |
| 390 | VPrintError(format, args); |
| 391 | va_end(args); |
| 392 | } |
| 393 | |
| 394 | |
| 395 | void OS::VPrintError(const char* format, va_list args) { |
| 396 | #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT) |
| 397 | __android_log_vprint(ANDROID_LOG_ERROR, LOG_TAG, format, args); |
| 398 | #else |
| 399 | vfprintf(stderr, format, args); |
| 400 | #endif |
| 401 | } |
| 402 | |
| 403 | |
| 404 | int OS::SNPrintF(char* str, int length, const char* format, ...) { |
| 405 | va_list args; |
| 406 | va_start(args, format); |
| 407 | int result = VSNPrintF(str, length, format, args); |
| 408 | va_end(args); |
| 409 | return result; |
| 410 | } |
| 411 | |
| 412 | |
| 413 | int OS::VSNPrintF(char* str, |
| 414 | int length, |
| 415 | const char* format, |
| 416 | va_list args) { |
| 417 | int n = vsnprintf(str, length, format, args); |
| 418 | if (n < 0 || n >= length) { |
| 419 | // If the length is zero, the assignment fails. |
| 420 | if (length > 0) |
| 421 | str[length - 1] = '\0'; |
| 422 | return -1; |
| 423 | } else { |
| 424 | return n; |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | |
| 429 | // ---------------------------------------------------------------------------- |
| 430 | // POSIX string support. |
| 431 | // |
| 432 | |
| 433 | char* OS::StrChr(char* str, int c) { |
| 434 | return strchr(str, c); |
| 435 | } |
| 436 | |
| 437 | |
| 438 | void OS::StrNCpy(char* dest, int length, const char* src, size_t n) { |
| 439 | strncpy(dest, src, n); |
| 440 | } |
| 441 | |
| 442 | |
| 443 | // ---------------------------------------------------------------------------- |
| 444 | // POSIX thread support. |
| 445 | // |
| 446 | |
| 447 | class Thread::PlatformData { |
| 448 | public: |
| 449 | PlatformData() : thread_(kNoThread) {} |
| 450 | pthread_t thread_; // Thread handle for pthread. |
| 451 | // Synchronizes thread creation |
| 452 | Mutex thread_creation_mutex_; |
| 453 | }; |
| 454 | |
| 455 | Thread::Thread(const Options& options) |
| 456 | : data_(new PlatformData), |
| 457 | stack_size_(options.stack_size()), |
| 458 | start_semaphore_(NULL) { |
| 459 | if (stack_size_ > 0 && static_cast<size_t>(stack_size_) < PTHREAD_STACK_MIN) { |
| 460 | stack_size_ = PTHREAD_STACK_MIN; |
| 461 | } |
| 462 | set_name(options.name()); |
| 463 | } |
| 464 | |
| 465 | |
| 466 | Thread::~Thread() { |
| 467 | delete data_; |
| 468 | } |
| 469 | |
| 470 | |
| 471 | static void SetThreadName(const char* name) { |
| 472 | #if V8_OS_DRAGONFLYBSD || V8_OS_FREEBSD || V8_OS_OPENBSD |
| 473 | pthread_set_name_np(pthread_self(), name); |
| 474 | #elif V8_OS_NETBSD |
| 475 | STATIC_ASSERT(Thread::kMaxThreadNameLength <= PTHREAD_MAX_NAMELEN_NP); |
| 476 | pthread_setname_np(pthread_self(), "%s", name); |
| 477 | #elif V8_OS_MACOSX |
| 478 | // pthread_setname_np is only available in 10.6 or later, so test |
| 479 | // for it at runtime. |
| 480 | int (*dynamic_pthread_setname_np)(const char*); |
| 481 | *reinterpret_cast<void**>(&dynamic_pthread_setname_np) = |
| 482 | dlsym(RTLD_DEFAULT, "pthread_setname_np"); |
| 483 | if (dynamic_pthread_setname_np == NULL) |
| 484 | return; |
| 485 | |
| 486 | // Mac OS X does not expose the length limit of the name, so hardcode it. |
| 487 | static const int kMaxNameLength = 63; |
| 488 | STATIC_ASSERT(Thread::kMaxThreadNameLength <= kMaxNameLength); |
| 489 | dynamic_pthread_setname_np(name); |
| 490 | #elif defined(PR_SET_NAME) |
| 491 | prctl(PR_SET_NAME, |
| 492 | reinterpret_cast<unsigned long>(name), // NOLINT |
| 493 | 0, 0, 0); |
| 494 | #endif |
| 495 | } |
| 496 | |
| 497 | |
| 498 | static void* ThreadEntry(void* arg) { |
| 499 | Thread* thread = reinterpret_cast<Thread*>(arg); |
| 500 | // We take the lock here to make sure that pthread_create finished first since |
| 501 | // we don't know which thread will run first (the original thread or the new |
| 502 | // one). |
| 503 | { LockGuard<Mutex> lock_guard(&thread->data()->thread_creation_mutex_); } |
| 504 | SetThreadName(thread->name()); |
| 505 | DCHECK(thread->data()->thread_ != kNoThread); |
| 506 | thread->NotifyStartedAndRun(); |
| 507 | return NULL; |
| 508 | } |
| 509 | |
| 510 | |
| 511 | void Thread::set_name(const char* name) { |
| 512 | strncpy(name_, name, sizeof(name_)); |
| 513 | name_[sizeof(name_) - 1] = '\0'; |
| 514 | } |
| 515 | |
| 516 | |
| 517 | void Thread::Start() { |
| 518 | int result; |
| 519 | pthread_attr_t attr; |
| 520 | memset(&attr, 0, sizeof(attr)); |
| 521 | result = pthread_attr_init(&attr); |
| 522 | DCHECK_EQ(0, result); |
| 523 | // Native client uses default stack size. |
| 524 | #if !V8_OS_NACL |
| 525 | if (stack_size_ > 0) { |
| 526 | result = pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_)); |
| 527 | DCHECK_EQ(0, result); |
| 528 | } |
| 529 | #endif |
| 530 | { |
| 531 | LockGuard<Mutex> lock_guard(&data_->thread_creation_mutex_); |
| 532 | result = pthread_create(&data_->thread_, &attr, ThreadEntry, this); |
| 533 | } |
| 534 | DCHECK_EQ(0, result); |
| 535 | result = pthread_attr_destroy(&attr); |
| 536 | DCHECK_EQ(0, result); |
| 537 | DCHECK(data_->thread_ != kNoThread); |
| 538 | USE(result); |
| 539 | } |
| 540 | |
| 541 | |
| 542 | void Thread::Join() { |
| 543 | pthread_join(data_->thread_, NULL); |
| 544 | } |
| 545 | |
| 546 | |
| 547 | void Thread::YieldCPU() { |
| 548 | int result = sched_yield(); |
| 549 | DCHECK_EQ(0, result); |
| 550 | USE(result); |
| 551 | } |
| 552 | |
| 553 | |
| 554 | static Thread::LocalStorageKey PthreadKeyToLocalKey(pthread_key_t pthread_key) { |
| 555 | #if V8_OS_CYGWIN |
| 556 | // We need to cast pthread_key_t to Thread::LocalStorageKey in two steps |
| 557 | // because pthread_key_t is a pointer type on Cygwin. This will probably not |
| 558 | // work on 64-bit platforms, but Cygwin doesn't support 64-bit anyway. |
| 559 | STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t)); |
| 560 | intptr_t ptr_key = reinterpret_cast<intptr_t>(pthread_key); |
| 561 | return static_cast<Thread::LocalStorageKey>(ptr_key); |
| 562 | #else |
| 563 | return static_cast<Thread::LocalStorageKey>(pthread_key); |
| 564 | #endif |
| 565 | } |
| 566 | |
| 567 | |
| 568 | static pthread_key_t LocalKeyToPthreadKey(Thread::LocalStorageKey local_key) { |
| 569 | #if V8_OS_CYGWIN |
| 570 | STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t)); |
| 571 | intptr_t ptr_key = static_cast<intptr_t>(local_key); |
| 572 | return reinterpret_cast<pthread_key_t>(ptr_key); |
| 573 | #else |
| 574 | return static_cast<pthread_key_t>(local_key); |
| 575 | #endif |
| 576 | } |
| 577 | |
| 578 | |
| 579 | #ifdef V8_FAST_TLS_SUPPORTED |
| 580 | |
| 581 | static Atomic32 tls_base_offset_initialized = 0; |
| 582 | intptr_t kMacTlsBaseOffset = 0; |
| 583 | |
| 584 | // It's safe to do the initialization more that once, but it has to be |
| 585 | // done at least once. |
| 586 | static void InitializeTlsBaseOffset() { |
| 587 | const size_t kBufferSize = 128; |
| 588 | char buffer[kBufferSize]; |
| 589 | size_t buffer_size = kBufferSize; |
| 590 | int ctl_name[] = { CTL_KERN , KERN_OSRELEASE }; |
| 591 | if (sysctl(ctl_name, 2, buffer, &buffer_size, NULL, 0) != 0) { |
| 592 | V8_Fatal(__FILE__, __LINE__, "V8 failed to get kernel version"); |
| 593 | } |
| 594 | // The buffer now contains a string of the form XX.YY.ZZ, where |
| 595 | // XX is the major kernel version component. |
| 596 | // Make sure the buffer is 0-terminated. |
| 597 | buffer[kBufferSize - 1] = '\0'; |
| 598 | char* period_pos = strchr(buffer, '.'); |
| 599 | *period_pos = '\0'; |
| 600 | int kernel_version_major = |
| 601 | static_cast<int>(strtol(buffer, NULL, 10)); // NOLINT |
| 602 | // The constants below are taken from pthreads.s from the XNU kernel |
| 603 | // sources archive at www.opensource.apple.com. |
| 604 | if (kernel_version_major < 11) { |
| 605 | // 8.x.x (Tiger), 9.x.x (Leopard), 10.x.x (Snow Leopard) have the |
| 606 | // same offsets. |
| 607 | #if V8_HOST_ARCH_IA32 |
| 608 | kMacTlsBaseOffset = 0x48; |
| 609 | #else |
| 610 | kMacTlsBaseOffset = 0x60; |
| 611 | #endif |
| 612 | } else { |
| 613 | // 11.x.x (Lion) changed the offset. |
| 614 | kMacTlsBaseOffset = 0; |
| 615 | } |
| 616 | |
| 617 | Release_Store(&tls_base_offset_initialized, 1); |
| 618 | } |
| 619 | |
| 620 | |
| 621 | static void CheckFastTls(Thread::LocalStorageKey key) { |
| 622 | void* expected = reinterpret_cast<void*>(0x1234CAFE); |
| 623 | Thread::SetThreadLocal(key, expected); |
| 624 | void* actual = Thread::GetExistingThreadLocal(key); |
| 625 | if (expected != actual) { |
| 626 | V8_Fatal(__FILE__, __LINE__, |
| 627 | "V8 failed to initialize fast TLS on current kernel"); |
| 628 | } |
| 629 | Thread::SetThreadLocal(key, NULL); |
| 630 | } |
| 631 | |
| 632 | #endif // V8_FAST_TLS_SUPPORTED |
| 633 | |
| 634 | |
| 635 | Thread::LocalStorageKey Thread::CreateThreadLocalKey() { |
| 636 | #ifdef V8_FAST_TLS_SUPPORTED |
| 637 | bool check_fast_tls = false; |
| 638 | if (tls_base_offset_initialized == 0) { |
| 639 | check_fast_tls = true; |
| 640 | InitializeTlsBaseOffset(); |
| 641 | } |
| 642 | #endif |
| 643 | pthread_key_t key; |
| 644 | int result = pthread_key_create(&key, NULL); |
| 645 | DCHECK_EQ(0, result); |
| 646 | USE(result); |
| 647 | LocalStorageKey local_key = PthreadKeyToLocalKey(key); |
| 648 | #ifdef V8_FAST_TLS_SUPPORTED |
| 649 | // If we just initialized fast TLS support, make sure it works. |
| 650 | if (check_fast_tls) CheckFastTls(local_key); |
| 651 | #endif |
| 652 | return local_key; |
| 653 | } |
| 654 | |
| 655 | |
| 656 | void Thread::DeleteThreadLocalKey(LocalStorageKey key) { |
| 657 | pthread_key_t pthread_key = LocalKeyToPthreadKey(key); |
| 658 | int result = pthread_key_delete(pthread_key); |
| 659 | DCHECK_EQ(0, result); |
| 660 | USE(result); |
| 661 | } |
| 662 | |
| 663 | |
| 664 | void* Thread::GetThreadLocal(LocalStorageKey key) { |
| 665 | pthread_key_t pthread_key = LocalKeyToPthreadKey(key); |
| 666 | return pthread_getspecific(pthread_key); |
| 667 | } |
| 668 | |
| 669 | |
| 670 | void Thread::SetThreadLocal(LocalStorageKey key, void* value) { |
| 671 | pthread_key_t pthread_key = LocalKeyToPthreadKey(key); |
| 672 | int result = pthread_setspecific(pthread_key, value); |
| 673 | DCHECK_EQ(0, result); |
| 674 | USE(result); |
| 675 | } |
| 676 | |
| 677 | |
| 678 | } } // namespace v8::base |