1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // Platform specific code for Cygwin goes here. For the POSIX comaptible parts 29 // the implementation is in platform-posix.cc. 30 31 #include <errno.h> 32 #include <pthread.h> 33 #include <semaphore.h> 34 #include <stdarg.h> 35 #include <strings.h> // index 36 #include <sys/time.h> 37 #include <sys/mman.h> // mmap & munmap 38 #include <unistd.h> // sysconf 39 40 #undef MAP_TYPE 41 42 #include "v8.h" 43 44 #include "platform-posix.h" 45 #include "platform.h" 46 #include "v8threads.h" 47 #include "vm-state-inl.h" 48 #include "win32-headers.h" 49 50 namespace v8 { 51 namespace internal { 52 53 // 0 is never a valid thread id 54 static const pthread_t kNoThread = (pthread_t) 0; 55 56 57 double ceiling(double x) { 58 return ceil(x); 59 } 60 61 62 static Mutex* limit_mutex = NULL; 63 64 65 void OS::SetUp() { 66 // Seed the random number generator. 67 // Convert the current time to a 64-bit integer first, before converting it 68 // to an unsigned. Going directly can cause an overflow and the seed to be 69 // set to all ones. The seed will be identical for different instances that 70 // call this setup code within the same millisecond. 71 uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()); 72 srandom(static_cast<unsigned int>(seed)); 73 limit_mutex = CreateMutex(); 74 } 75 76 77 void OS::PostSetUp() { 78 // Math functions depend on CPU features therefore they are initialized after 79 // CPU. 80 MathSetup(); 81 } 82 83 uint64_t OS::CpuFeaturesImpliedByPlatform() { 84 return 0; // Nothing special about Cygwin. 85 } 86 87 88 int OS::ActivationFrameAlignment() { 89 // With gcc 4.4 the tree vectorization optimizer can generate code 90 // that requires 16 byte alignment such as movdqa on x86. 91 return 16; 92 } 93 94 95 void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) { 96 __asm__ __volatile__("" : : : "memory"); 97 // An x86 store acts as a release barrier. 98 *ptr = value; 99 } 100 101 const char* OS::LocalTimezone(double time) { 102 if (isnan(time)) return ""; 103 time_t tv = static_cast<time_t>(floor(time/msPerSecond)); 104 struct tm* t = localtime(&tv); 105 if (NULL == t) return ""; 106 return tzname[0]; // The location of the timezone string on Cygwin. 107 } 108 109 110 double OS::LocalTimeOffset() { 111 // On Cygwin, struct tm does not contain a tm_gmtoff field. 112 time_t utc = time(NULL); 113 ASSERT(utc != -1); 114 struct tm* loc = localtime(&utc); 115 ASSERT(loc != NULL); 116 // time - localtime includes any daylight savings offset, so subtract it. 117 return static_cast<double>((mktime(loc) - utc) * msPerSecond - 118 (loc->tm_isdst > 0 ? 3600 * msPerSecond : 0)); 119 } 120 121 122 // We keep the lowest and highest addresses mapped as a quick way of 123 // determining that pointers are outside the heap (used mostly in assertions 124 // and verification). The estimate is conservative, i.e., not all addresses in 125 // 'allocated' space are actually allocated to our heap. The range is 126 // [lowest, highest), inclusive on the low and and exclusive on the high end. 127 static void* lowest_ever_allocated = reinterpret_cast<void*>(-1); 128 static void* highest_ever_allocated = reinterpret_cast<void*>(0); 129 130 131 static void UpdateAllocatedSpaceLimits(void* address, int size) { 132 ASSERT(limit_mutex != NULL); 133 ScopedLock lock(limit_mutex); 134 135 lowest_ever_allocated = Min(lowest_ever_allocated, address); 136 highest_ever_allocated = 137 Max(highest_ever_allocated, 138 reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size)); 139 } 140 141 142 bool OS::IsOutsideAllocatedSpace(void* address) { 143 return address < lowest_ever_allocated || address >= highest_ever_allocated; 144 } 145 146 147 size_t OS::AllocateAlignment() { 148 return sysconf(_SC_PAGESIZE); 149 } 150 151 152 void* OS::Allocate(const size_t requested, 153 size_t* allocated, 154 bool is_executable) { 155 const size_t msize = RoundUp(requested, sysconf(_SC_PAGESIZE)); 156 int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0); 157 void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 158 if (mbase == MAP_FAILED) { 159 LOG(ISOLATE, StringEvent("OS::Allocate", "mmap failed")); 160 return NULL; 161 } 162 *allocated = msize; 163 UpdateAllocatedSpaceLimits(mbase, msize); 164 return mbase; 165 } 166 167 168 void OS::Free(void* address, const size_t size) { 169 // TODO(1240712): munmap has a return value which is ignored here. 170 int result = munmap(address, size); 171 USE(result); 172 ASSERT(result == 0); 173 } 174 175 176 void OS::ProtectCode(void* address, const size_t size) { 177 DWORD old_protect; 178 VirtualProtect(address, size, PAGE_EXECUTE_READ, &old_protect); 179 } 180 181 182 void OS::Guard(void* address, const size_t size) { 183 DWORD oldprotect; 184 VirtualProtect(address, size, PAGE_READONLY | PAGE_GUARD, &oldprotect); 185 } 186 187 188 void OS::Sleep(int milliseconds) { 189 unsigned int ms = static_cast<unsigned int>(milliseconds); 190 usleep(1000 * ms); 191 } 192 193 194 void OS::Abort() { 195 // Redirect to std abort to signal abnormal program termination. 196 abort(); 197 } 198 199 200 void OS::DebugBreak() { 201 asm("int $3"); 202 } 203 204 205 class PosixMemoryMappedFile : public OS::MemoryMappedFile { 206 public: 207 PosixMemoryMappedFile(FILE* file, void* memory, int size) 208 : file_(file), memory_(memory), size_(size) { } 209 virtual ~PosixMemoryMappedFile(); 210 virtual void* memory() { return memory_; } 211 virtual int size() { return size_; } 212 private: 213 FILE* file_; 214 void* memory_; 215 int size_; 216 }; 217 218 219 OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) { 220 FILE* file = fopen(name, "r+"); 221 if (file == NULL) return NULL; 222 223 fseek(file, 0, SEEK_END); 224 int size = ftell(file); 225 226 void* memory = 227 mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); 228 return new PosixMemoryMappedFile(file, memory, size); 229 } 230 231 232 OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size, 233 void* initial) { 234 FILE* file = fopen(name, "w+"); 235 if (file == NULL) return NULL; 236 int result = fwrite(initial, size, 1, file); 237 if (result < 1) { 238 fclose(file); 239 return NULL; 240 } 241 void* memory = 242 mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0); 243 return new PosixMemoryMappedFile(file, memory, size); 244 } 245 246 247 PosixMemoryMappedFile::~PosixMemoryMappedFile() { 248 if (memory_) munmap(memory_, size_); 249 fclose(file_); 250 } 251 252 253 void OS::LogSharedLibraryAddresses() { 254 // This function assumes that the layout of the file is as follows: 255 // hex_start_addr-hex_end_addr rwxp <unused data> [binary_file_name] 256 // If we encounter an unexpected situation we abort scanning further entries. 257 FILE* fp = fopen("/proc/self/maps", "r"); 258 if (fp == NULL) return; 259 260 // Allocate enough room to be able to store a full file name. 261 const int kLibNameLen = FILENAME_MAX + 1; 262 char* lib_name = reinterpret_cast<char*>(malloc(kLibNameLen)); 263 264 i::Isolate* isolate = ISOLATE; 265 // This loop will terminate once the scanning hits an EOF. 266 while (true) { 267 uintptr_t start, end; 268 char attr_r, attr_w, attr_x, attr_p; 269 // Parse the addresses and permission bits at the beginning of the line. 270 if (fscanf(fp, "%" V8PRIxPTR "-%" V8PRIxPTR, &start, &end) != 2) break; 271 if (fscanf(fp, " %c%c%c%c", &attr_r, &attr_w, &attr_x, &attr_p) != 4) break; 272 273 int c; 274 if (attr_r == 'r' && attr_w != 'w' && attr_x == 'x') { 275 // Found a read-only executable entry. Skip characters until we reach 276 // the beginning of the filename or the end of the line. 277 do { 278 c = getc(fp); 279 } while ((c != EOF) && (c != '\n') && (c != '/')); 280 if (c == EOF) break; // EOF: Was unexpected, just exit. 281 282 // Process the filename if found. 283 if (c == '/') { 284 ungetc(c, fp); // Push the '/' back into the stream to be read below. 285 286 // Read to the end of the line. Exit if the read fails. 287 if (fgets(lib_name, kLibNameLen, fp) == NULL) break; 288 289 // Drop the newline character read by fgets. We do not need to check 290 // for a zero-length string because we know that we at least read the 291 // '/' character. 292 lib_name[strlen(lib_name) - 1] = '\0'; 293 } else { 294 // No library name found, just record the raw address range. 295 snprintf(lib_name, kLibNameLen, 296 "%08" V8PRIxPTR "-%08" V8PRIxPTR, start, end); 297 } 298 LOG(isolate, SharedLibraryEvent(lib_name, start, end)); 299 } else { 300 // Entry not describing executable data. Skip to end of line to set up 301 // reading the next entry. 302 do { 303 c = getc(fp); 304 } while ((c != EOF) && (c != '\n')); 305 if (c == EOF) break; 306 } 307 } 308 free(lib_name); 309 fclose(fp); 310 } 311 312 313 void OS::SignalCodeMovingGC() { 314 // Nothing to do on Cygwin. 315 } 316 317 318 int OS::StackWalk(Vector<OS::StackFrame> frames) { 319 // Not supported on Cygwin. 320 return 0; 321 } 322 323 324 // The VirtualMemory implementation is taken from platform-win32.cc. 325 // The mmap-based virtual memory implementation as it is used on most posix 326 // platforms does not work well because Cygwin does not support MAP_FIXED. 327 // This causes VirtualMemory::Commit to not always commit the memory region 328 // specified. 329 330 bool VirtualMemory::IsReserved() { 331 return address_ != NULL; 332 } 333 334 335 VirtualMemory::VirtualMemory(size_t size) { 336 address_ = VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS); 337 size_ = size; 338 } 339 340 341 VirtualMemory::~VirtualMemory() { 342 if (IsReserved()) { 343 if (0 == VirtualFree(address(), 0, MEM_RELEASE)) address_ = NULL; 344 } 345 } 346 347 348 bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) { 349 int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 350 if (NULL == VirtualAlloc(address, size, MEM_COMMIT, prot)) { 351 return false; 352 } 353 354 UpdateAllocatedSpaceLimits(address, static_cast<int>(size)); 355 return true; 356 } 357 358 359 bool VirtualMemory::Uncommit(void* address, size_t size) { 360 ASSERT(IsReserved()); 361 return VirtualFree(address, size, MEM_DECOMMIT) != false; 362 } 363 364 365 bool VirtualMemory::Guard(void* address) { 366 if (NULL == VirtualAlloc(address, 367 OS::CommitPageSize(), 368 MEM_COMMIT, 369 PAGE_READONLY | PAGE_GUARD)) { 370 return false; 371 } 372 return true; 373 } 374 375 376 class Thread::PlatformData : public Malloced { 377 public: 378 PlatformData() : thread_(kNoThread) {} 379 pthread_t thread_; // Thread handle for pthread. 380 }; 381 382 383 384 385 Thread::Thread(const Options& options) 386 : data_(new PlatformData()), 387 stack_size_(options.stack_size()) { 388 set_name(options.name()); 389 } 390 391 392 Thread::~Thread() { 393 delete data_; 394 } 395 396 397 static void* ThreadEntry(void* arg) { 398 Thread* thread = reinterpret_cast<Thread*>(arg); 399 // This is also initialized by the first argument to pthread_create() but we 400 // don't know which thread will run first (the original thread or the new 401 // one) so we initialize it here too. 402 thread->data()->thread_ = pthread_self(); 403 ASSERT(thread->data()->thread_ != kNoThread); 404 thread->Run(); 405 return NULL; 406 } 407 408 409 void Thread::set_name(const char* name) { 410 strncpy(name_, name, sizeof(name_)); 411 name_[sizeof(name_) - 1] = '\0'; 412 } 413 414 415 void Thread::Start() { 416 pthread_attr_t* attr_ptr = NULL; 417 pthread_attr_t attr; 418 if (stack_size_ > 0) { 419 pthread_attr_init(&attr); 420 pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_)); 421 attr_ptr = &attr; 422 } 423 pthread_create(&data_->thread_, attr_ptr, ThreadEntry, this); 424 ASSERT(data_->thread_ != kNoThread); 425 } 426 427 428 void Thread::Join() { 429 pthread_join(data_->thread_, NULL); 430 } 431 432 433 static inline Thread::LocalStorageKey PthreadKeyToLocalKey( 434 pthread_key_t pthread_key) { 435 // We need to cast pthread_key_t to Thread::LocalStorageKey in two steps 436 // because pthread_key_t is a pointer type on Cygwin. This will probably not 437 // work on 64-bit platforms, but Cygwin doesn't support 64-bit anyway. 438 STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t)); 439 intptr_t ptr_key = reinterpret_cast<intptr_t>(pthread_key); 440 return static_cast<Thread::LocalStorageKey>(ptr_key); 441 } 442 443 444 static inline pthread_key_t LocalKeyToPthreadKey( 445 Thread::LocalStorageKey local_key) { 446 STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t)); 447 intptr_t ptr_key = static_cast<intptr_t>(local_key); 448 return reinterpret_cast<pthread_key_t>(ptr_key); 449 } 450 451 452 Thread::LocalStorageKey Thread::CreateThreadLocalKey() { 453 pthread_key_t key; 454 int result = pthread_key_create(&key, NULL); 455 USE(result); 456 ASSERT(result == 0); 457 return PthreadKeyToLocalKey(key); 458 } 459 460 461 void Thread::DeleteThreadLocalKey(LocalStorageKey key) { 462 pthread_key_t pthread_key = LocalKeyToPthreadKey(key); 463 int result = pthread_key_delete(pthread_key); 464 USE(result); 465 ASSERT(result == 0); 466 } 467 468 469 void* Thread::GetThreadLocal(LocalStorageKey key) { 470 pthread_key_t pthread_key = LocalKeyToPthreadKey(key); 471 return pthread_getspecific(pthread_key); 472 } 473 474 475 void Thread::SetThreadLocal(LocalStorageKey key, void* value) { 476 pthread_key_t pthread_key = LocalKeyToPthreadKey(key); 477 pthread_setspecific(pthread_key, value); 478 } 479 480 481 void Thread::YieldCPU() { 482 sched_yield(); 483 } 484 485 486 class CygwinMutex : public Mutex { 487 public: 488 CygwinMutex() { 489 pthread_mutexattr_t attrs; 490 memset(&attrs, 0, sizeof(attrs)); 491 492 int result = pthread_mutexattr_init(&attrs); 493 ASSERT(result == 0); 494 result = pthread_mutexattr_settype(&attrs, PTHREAD_MUTEX_RECURSIVE); 495 ASSERT(result == 0); 496 result = pthread_mutex_init(&mutex_, &attrs); 497 ASSERT(result == 0); 498 } 499 500 virtual ~CygwinMutex() { pthread_mutex_destroy(&mutex_); } 501 502 virtual int Lock() { 503 int result = pthread_mutex_lock(&mutex_); 504 return result; 505 } 506 507 virtual int Unlock() { 508 int result = pthread_mutex_unlock(&mutex_); 509 return result; 510 } 511 512 virtual bool TryLock() { 513 int result = pthread_mutex_trylock(&mutex_); 514 // Return false if the lock is busy and locking failed. 515 if (result == EBUSY) { 516 return false; 517 } 518 ASSERT(result == 0); // Verify no other errors. 519 return true; 520 } 521 522 private: 523 pthread_mutex_t mutex_; // Pthread mutex for POSIX platforms. 524 }; 525 526 527 Mutex* OS::CreateMutex() { 528 return new CygwinMutex(); 529 } 530 531 532 class CygwinSemaphore : public Semaphore { 533 public: 534 explicit CygwinSemaphore(int count) { sem_init(&sem_, 0, count); } 535 virtual ~CygwinSemaphore() { sem_destroy(&sem_); } 536 537 virtual void Wait(); 538 virtual bool Wait(int timeout); 539 virtual void Signal() { sem_post(&sem_); } 540 private: 541 sem_t sem_; 542 }; 543 544 545 void CygwinSemaphore::Wait() { 546 while (true) { 547 int result = sem_wait(&sem_); 548 if (result == 0) return; // Successfully got semaphore. 549 CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. 550 } 551 } 552 553 554 #ifndef TIMEVAL_TO_TIMESPEC 555 #define TIMEVAL_TO_TIMESPEC(tv, ts) do { \ 556 (ts)->tv_sec = (tv)->tv_sec; \ 557 (ts)->tv_nsec = (tv)->tv_usec * 1000; \ 558 } while (false) 559 #endif 560 561 562 bool CygwinSemaphore::Wait(int timeout) { 563 const long kOneSecondMicros = 1000000; // NOLINT 564 565 // Split timeout into second and nanosecond parts. 566 struct timeval delta; 567 delta.tv_usec = timeout % kOneSecondMicros; 568 delta.tv_sec = timeout / kOneSecondMicros; 569 570 struct timeval current_time; 571 // Get the current time. 572 if (gettimeofday(¤t_time, NULL) == -1) { 573 return false; 574 } 575 576 // Calculate time for end of timeout. 577 struct timeval end_time; 578 timeradd(¤t_time, &delta, &end_time); 579 580 struct timespec ts; 581 TIMEVAL_TO_TIMESPEC(&end_time, &ts); 582 // Wait for semaphore signalled or timeout. 583 while (true) { 584 int result = sem_timedwait(&sem_, &ts); 585 if (result == 0) return true; // Successfully got semaphore. 586 if (result == -1 && errno == ETIMEDOUT) return false; // Timeout. 587 CHECK(result == -1 && errno == EINTR); // Signal caused spurious wakeup. 588 } 589 } 590 591 592 Semaphore* OS::CreateSemaphore(int count) { 593 return new CygwinSemaphore(count); 594 } 595 596 597 // ---------------------------------------------------------------------------- 598 // Cygwin profiler support. 599 // 600 // On Cygwin we use the same sampler implementation as on win32. 601 602 class Sampler::PlatformData : public Malloced { 603 public: 604 // Get a handle to the calling thread. This is the thread that we are 605 // going to profile. We need to make a copy of the handle because we are 606 // going to use it in the sampler thread. Using GetThreadHandle() will 607 // not work in this case. We're using OpenThread because DuplicateHandle 608 // for some reason doesn't work in Chrome's sandbox. 609 PlatformData() : profiled_thread_(OpenThread(THREAD_GET_CONTEXT | 610 THREAD_SUSPEND_RESUME | 611 THREAD_QUERY_INFORMATION, 612 false, 613 GetCurrentThreadId())) {} 614 615 ~PlatformData() { 616 if (profiled_thread_ != NULL) { 617 CloseHandle(profiled_thread_); 618 profiled_thread_ = NULL; 619 } 620 } 621 622 HANDLE profiled_thread() { return profiled_thread_; } 623 624 private: 625 HANDLE profiled_thread_; 626 }; 627 628 629 class SamplerThread : public Thread { 630 public: 631 static const int kSamplerThreadStackSize = 64 * KB; 632 633 explicit SamplerThread(int interval) 634 : Thread(Thread::Options("SamplerThread", kSamplerThreadStackSize)), 635 interval_(interval) {} 636 637 static void AddActiveSampler(Sampler* sampler) { 638 ScopedLock lock(mutex_.Pointer()); 639 SamplerRegistry::AddActiveSampler(sampler); 640 if (instance_ == NULL) { 641 instance_ = new SamplerThread(sampler->interval()); 642 instance_->Start(); 643 } else { 644 ASSERT(instance_->interval_ == sampler->interval()); 645 } 646 } 647 648 static void RemoveActiveSampler(Sampler* sampler) { 649 ScopedLock lock(mutex_.Pointer()); 650 SamplerRegistry::RemoveActiveSampler(sampler); 651 if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) { 652 RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_); 653 delete instance_; 654 instance_ = NULL; 655 } 656 } 657 658 // Implement Thread::Run(). 659 virtual void Run() { 660 SamplerRegistry::State state; 661 while ((state = SamplerRegistry::GetState()) != 662 SamplerRegistry::HAS_NO_SAMPLERS) { 663 bool cpu_profiling_enabled = 664 (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS); 665 bool runtime_profiler_enabled = RuntimeProfiler::IsEnabled(); 666 // When CPU profiling is enabled both JavaScript and C++ code is 667 // profiled. We must not suspend. 668 if (!cpu_profiling_enabled) { 669 if (rate_limiter_.SuspendIfNecessary()) continue; 670 } 671 if (cpu_profiling_enabled) { 672 if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) { 673 return; 674 } 675 } 676 if (runtime_profiler_enabled) { 677 if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) { 678 return; 679 } 680 } 681 OS::Sleep(interval_); 682 } 683 } 684 685 static void DoCpuProfile(Sampler* sampler, void* raw_sampler_thread) { 686 if (!sampler->isolate()->IsInitialized()) return; 687 if (!sampler->IsProfiling()) return; 688 SamplerThread* sampler_thread = 689 reinterpret_cast<SamplerThread*>(raw_sampler_thread); 690 sampler_thread->SampleContext(sampler); 691 } 692 693 static void DoRuntimeProfile(Sampler* sampler, void* ignored) { 694 if (!sampler->isolate()->IsInitialized()) return; 695 sampler->isolate()->runtime_profiler()->NotifyTick(); 696 } 697 698 void SampleContext(Sampler* sampler) { 699 HANDLE profiled_thread = sampler->platform_data()->profiled_thread(); 700 if (profiled_thread == NULL) return; 701 702 // Context used for sampling the register state of the profiled thread. 703 CONTEXT context; 704 memset(&context, 0, sizeof(context)); 705 706 TickSample sample_obj; 707 TickSample* sample = CpuProfiler::TickSampleEvent(sampler->isolate()); 708 if (sample == NULL) sample = &sample_obj; 709 710 static const DWORD kSuspendFailed = static_cast<DWORD>(-1); 711 if (SuspendThread(profiled_thread) == kSuspendFailed) return; 712 sample->state = sampler->isolate()->current_vm_state(); 713 714 context.ContextFlags = CONTEXT_FULL; 715 if (GetThreadContext(profiled_thread, &context) != 0) { 716 #if V8_HOST_ARCH_X64 717 sample->pc = reinterpret_cast<Address>(context.Rip); 718 sample->sp = reinterpret_cast<Address>(context.Rsp); 719 sample->fp = reinterpret_cast<Address>(context.Rbp); 720 #else 721 sample->pc = reinterpret_cast<Address>(context.Eip); 722 sample->sp = reinterpret_cast<Address>(context.Esp); 723 sample->fp = reinterpret_cast<Address>(context.Ebp); 724 #endif 725 sampler->SampleStack(sample); 726 sampler->Tick(sample); 727 } 728 ResumeThread(profiled_thread); 729 } 730 731 const int interval_; 732 RuntimeProfilerRateLimiter rate_limiter_; 733 734 // Protects the process wide state below. 735 static LazyMutex mutex_; 736 static SamplerThread* instance_; 737 738 private: 739 DISALLOW_COPY_AND_ASSIGN(SamplerThread); 740 }; 741 742 743 LazyMutex SamplerThread::mutex_ = LAZY_MUTEX_INITIALIZER; 744 SamplerThread* SamplerThread::instance_ = NULL; 745 746 747 Sampler::Sampler(Isolate* isolate, int interval) 748 : isolate_(isolate), 749 interval_(interval), 750 profiling_(false), 751 active_(false), 752 samples_taken_(0) { 753 data_ = new PlatformData; 754 } 755 756 757 Sampler::~Sampler() { 758 ASSERT(!IsActive()); 759 delete data_; 760 } 761 762 763 void Sampler::Start() { 764 ASSERT(!IsActive()); 765 SetActive(true); 766 SamplerThread::AddActiveSampler(this); 767 } 768 769 770 void Sampler::Stop() { 771 ASSERT(IsActive()); 772 SamplerThread::RemoveActiveSampler(this); 773 SetActive(false); 774 } 775 776 777 } } // namespace v8::internal 778