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| 1 // Copyright 2016 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 #include "src/libsampler/v8-sampler.h" | |
| 6 | |
| 7 #if V8_OS_POSIX && !V8_OS_CYGWIN | |
| 8 | |
| 9 #define USE_SIGNALS | |
| 10 | |
| 11 #include <errno.h> | |
| 12 #include <pthread.h> | |
| 13 #include <signal.h> | |
| 14 #include <sys/time.h> | |
| 15 | |
| 16 #if !V8_OS_QNX && !V8_OS_NACL && !V8_OS_AIX | |
| 17 #include <sys/syscall.h> // NOLINT | |
| 18 #endif | |
| 19 | |
| 20 #if V8_OS_MACOSX | |
| 21 #include <mach/mach.h> | |
| 22 // OpenBSD doesn't have <ucontext.h>. ucontext_t lives in <signal.h> | |
| 23 // and is a typedef for struct sigcontext. There is no uc_mcontext. | |
| 24 #elif(!V8_OS_ANDROID || defined(__BIONIC_HAVE_UCONTEXT_T)) && \ | |
| 25 !V8_OS_OPENBSD && !V8_OS_NACL | |
| 26 #include <ucontext.h> | |
| 27 #endif | |
| 28 | |
| 29 #include <unistd.h> | |
| 30 | |
| 31 // GLibc on ARM defines mcontext_t has a typedef for 'struct sigcontext'. | |
| 32 // Old versions of the C library <signal.h> didn't define the type. | |
| 33 #if V8_OS_ANDROID && !defined(__BIONIC_HAVE_UCONTEXT_T) && \ | |
| 34 (defined(__arm__) || defined(__aarch64__)) && \ | |
| 35 !defined(__BIONIC_HAVE_STRUCT_SIGCONTEXT) | |
| 36 #include <asm/sigcontext.h> // NOLINT | |
| 37 #endif | |
| 38 | |
| 39 #elif V8_OS_WIN || V8_OS_CYGWIN | |
| 40 | |
| 41 #include "src/base/win32-headers.h" | |
| 42 | |
| 43 #endif | |
| 44 | |
| 45 #include <algorithm> | |
| 46 #include <vector> | |
| 47 #include <map> | |
| 48 | |
| 49 #include "src/base/atomic-utils.h" | |
| 50 #include "src/base/platform/platform.h" | |
| 51 #include "src/libsampler/hashmap.h" | |
| 52 | |
| 53 | |
| 54 #if V8_OS_ANDROID && !defined(__BIONIC_HAVE_UCONTEXT_T) | |
| 55 | |
| 56 // Not all versions of Android's C library provide ucontext_t. | |
| 57 // Detect this and provide custom but compatible definitions. Note that these | |
| 58 // follow the GLibc naming convention to access register values from | |
| 59 // mcontext_t. | |
| 60 // | |
| 61 // See http://code.google.com/p/android/issues/detail?id=34784 | |
| 62 | |
| 63 #if defined(__arm__) | |
| 64 | |
| 65 typedef struct sigcontext mcontext_t; | |
| 66 | |
| 67 typedef struct ucontext { | |
| 68 uint32_t uc_flags; | |
| 69 struct ucontext* uc_link; | |
| 70 stack_t uc_stack; | |
| 71 mcontext_t uc_mcontext; | |
| 72 // Other fields are not used by V8, don't define them here. | |
| 73 } ucontext_t; | |
| 74 | |
| 75 #elif defined(__aarch64__) | |
| 76 | |
| 77 typedef struct sigcontext mcontext_t; | |
| 78 | |
| 79 typedef struct ucontext { | |
| 80 uint64_t uc_flags; | |
| 81 struct ucontext *uc_link; | |
| 82 stack_t uc_stack; | |
| 83 mcontext_t uc_mcontext; | |
| 84 // Other fields are not used by V8, don't define them here. | |
| 85 } ucontext_t; | |
| 86 | |
| 87 #elif defined(__mips__) | |
| 88 // MIPS version of sigcontext, for Android bionic. | |
| 89 typedef struct { | |
| 90 uint32_t regmask; | |
| 91 uint32_t status; | |
| 92 uint64_t pc; | |
| 93 uint64_t gregs[32]; | |
| 94 uint64_t fpregs[32]; | |
| 95 uint32_t acx; | |
| 96 uint32_t fpc_csr; | |
| 97 uint32_t fpc_eir; | |
| 98 uint32_t used_math; | |
| 99 uint32_t dsp; | |
| 100 uint64_t mdhi; | |
| 101 uint64_t mdlo; | |
| 102 uint32_t hi1; | |
| 103 uint32_t lo1; | |
| 104 uint32_t hi2; | |
| 105 uint32_t lo2; | |
| 106 uint32_t hi3; | |
| 107 uint32_t lo3; | |
| 108 } mcontext_t; | |
| 109 | |
| 110 typedef struct ucontext { | |
| 111 uint32_t uc_flags; | |
| 112 struct ucontext* uc_link; | |
| 113 stack_t uc_stack; | |
| 114 mcontext_t uc_mcontext; | |
| 115 // Other fields are not used by V8, don't define them here. | |
| 116 } ucontext_t; | |
| 117 | |
| 118 #elif defined(__i386__) | |
| 119 // x86 version for Android. | |
| 120 typedef struct { | |
| 121 uint32_t gregs[19]; | |
| 122 void* fpregs; | |
| 123 uint32_t oldmask; | |
| 124 uint32_t cr2; | |
| 125 } mcontext_t; | |
| 126 | |
| 127 typedef uint32_t kernel_sigset_t[2]; // x86 kernel uses 64-bit signal masks | |
| 128 typedef struct ucontext { | |
| 129 uint32_t uc_flags; | |
| 130 struct ucontext* uc_link; | |
| 131 stack_t uc_stack; | |
| 132 mcontext_t uc_mcontext; | |
| 133 // Other fields are not used by V8, don't define them here. | |
| 134 } ucontext_t; | |
| 135 enum { REG_EBP = 6, REG_ESP = 7, REG_EIP = 14 }; | |
| 136 | |
| 137 #elif defined(__x86_64__) | |
| 138 // x64 version for Android. | |
| 139 typedef struct { | |
| 140 uint64_t gregs[23]; | |
| 141 void* fpregs; | |
| 142 uint64_t __reserved1[8]; | |
| 143 } mcontext_t; | |
| 144 | |
| 145 typedef struct ucontext { | |
| 146 uint64_t uc_flags; | |
| 147 struct ucontext *uc_link; | |
| 148 stack_t uc_stack; | |
| 149 mcontext_t uc_mcontext; | |
| 150 // Other fields are not used by V8, don't define them here. | |
| 151 } ucontext_t; | |
| 152 enum { REG_RBP = 10, REG_RSP = 15, REG_RIP = 16 }; | |
| 153 #endif | |
| 154 | |
| 155 #endif // V8_OS_ANDROID && !defined(__BIONIC_HAVE_UCONTEXT_T) | |
| 156 | |
| 157 | |
| 158 namespace v8 { | |
| 159 namespace sampler { | |
| 160 | |
| 161 namespace { | |
| 162 | |
| 163 #if defined(USE_SIGNALS) | |
| 164 typedef std::vector<Sampler*> SamplerList; | |
| 165 typedef SamplerList::iterator SamplerListIterator; | |
| 166 | |
| 167 class AtomicGuard { | |
| 168 public: | |
| 169 explicit AtomicGuard(base::AtomicValue<int>* atomic, bool is_block = true) | |
| 170 : atomic_(atomic), | |
| 171 is_success_(false) { | |
| 172 do { | |
| 173 // Use Acquire_Load to gain mutual exclusion. | |
| 174 USE(atomic_->Value()); | |
| 175 is_success_ = atomic_->TrySetValue(0, 1); | |
| 176 } while (is_block && !is_success_); | |
| 177 } | |
| 178 | |
| 179 bool is_success() { return is_success_; } | |
| 180 | |
| 181 ~AtomicGuard() { | |
| 182 if (is_success_) { | |
| 183 atomic_->SetValue(0); | |
| 184 } | |
| 185 atomic_ = NULL; | |
| 186 } | |
| 187 | |
| 188 private: | |
| 189 base::AtomicValue<int>* atomic_; | |
| 190 bool is_success_; | |
| 191 }; | |
| 192 | |
| 193 | |
| 194 // Returns key for hash map. | |
| 195 void* ThreadKey(pthread_t thread_id) { | |
| 196 return reinterpret_cast<void*>(thread_id); | |
| 197 } | |
| 198 | |
| 199 | |
| 200 // Returns hash value for hash map. | |
| 201 uint32_t ThreadHash(pthread_t thread_id) { | |
| 202 #if V8_OS_MACOSX | |
| 203 return static_cast<uint32_t>(reinterpret_cast<intptr_t>(thread_id)); | |
| 204 #else | |
| 205 return static_cast<uint32_t>(thread_id); | |
| 206 #endif | |
| 207 } | |
| 208 | |
| 209 #endif // USE_SIGNALS | |
| 210 | |
| 211 } // namespace | |
| 212 | |
| 213 #if defined(USE_SIGNALS) | |
| 214 | |
| 215 class Sampler::PlatformData { | |
| 216 public: | |
| 217 PlatformData() : vm_tid_(pthread_self()) {} | |
| 218 pthread_t vm_tid() const { return vm_tid_; } | |
| 219 | |
| 220 private: | |
| 221 pthread_t vm_tid_; | |
| 222 }; | |
| 223 | |
| 224 | |
| 225 class SamplerManager { | |
| 226 public: | |
| 227 static void AddSampler(Sampler* sampler) { | |
| 228 AtomicGuard atomic_guard(&samplers_access_counter_); | |
| 229 DCHECK(sampler->IsActive() || !sampler->IsRegistered()); | |
| 230 // Add sampler into map if needed. | |
| 231 pthread_t thread_id = sampler->platform_data()->vm_tid(); | |
| 232 HashMap::Entry* entry = | |
| 233 sampler_map_.Pointer()->LookupOrInsert(ThreadKey(thread_id), | |
| 234 ThreadHash(thread_id)); | |
| 235 DCHECK(entry != NULL); | |
| 236 if (entry->value == NULL) { | |
| 237 SamplerList* samplers = new SamplerList(); | |
| 238 samplers->push_back(sampler); | |
| 239 entry->value = samplers; | |
| 240 } else { | |
| 241 SamplerList* samplers = reinterpret_cast<SamplerList*>(entry->value); | |
| 242 bool exists = false; | |
| 243 for (SamplerListIterator iter = samplers->begin(); | |
| 244 iter != samplers->end(); ++iter) { | |
| 245 if (*iter == sampler) { | |
| 246 exists = true; | |
| 247 break; | |
| 248 } | |
| 249 } | |
| 250 if (!exists) { | |
| 251 samplers->push_back(sampler); | |
| 252 } | |
| 253 } | |
| 254 } | |
| 255 | |
| 256 static void RemoveSampler(Sampler* sampler) { | |
| 257 AtomicGuard atomic_guard(&samplers_access_counter_); | |
| 258 DCHECK(sampler->IsActive() || sampler->IsRegistered()); | |
| 259 // Remove sampler from map. | |
| 260 pthread_t thread_id = sampler->platform_data()->vm_tid(); | |
| 261 void* thread_key = ThreadKey(thread_id); | |
| 262 uint32_t thread_hash = ThreadHash(thread_id); | |
| 263 HashMap::Entry* entry = sampler_map_.Get().Lookup(thread_key, thread_hash); | |
| 264 DCHECK(entry != NULL); | |
| 265 SamplerList* samplers = reinterpret_cast<SamplerList*>(entry->value); | |
| 266 for (SamplerListIterator iter = samplers->begin(); iter != samplers->end(); | |
| 267 ++iter) { | |
| 268 if (*iter == sampler) { | |
| 269 samplers->erase(iter); | |
| 270 break; | |
| 271 } | |
| 272 } | |
| 273 if (samplers->empty()) { | |
| 274 sampler_map_.Pointer()->Remove(thread_key, thread_hash); | |
| 275 delete samplers; | |
| 276 } | |
| 277 } | |
| 278 | |
| 279 private: | |
| 280 struct HashMapCreateTrait { | |
| 281 static void Construct(HashMap* allocated_ptr) { | |
| 282 new (allocated_ptr) HashMap(HashMap::PointersMatch); | |
| 283 } | |
| 284 }; | |
| 285 friend class SignalHandler; | |
| 286 static base::LazyInstance<HashMap, HashMapCreateTrait>::type | |
| 287 sampler_map_; | |
| 288 static base::AtomicValue<int> samplers_access_counter_; | |
| 289 }; | |
| 290 | |
| 291 base::LazyInstance<HashMap, SamplerManager::HashMapCreateTrait>::type | |
| 292 SamplerManager::sampler_map_ = LAZY_INSTANCE_INITIALIZER; | |
| 293 base::AtomicValue<int> SamplerManager::samplers_access_counter_(0); | |
| 294 | |
| 295 | |
| 296 #elif V8_OS_WIN || V8_OS_CYGWIN | |
| 297 | |
| 298 // ---------------------------------------------------------------------------- | |
| 299 // Win32 profiler support. On Cygwin we use the same sampler implementation as | |
| 300 // on Win32. | |
| 301 | |
| 302 class Sampler::PlatformData { | |
| 303 public: | |
| 304 // Get a handle to the calling thread. This is the thread that we are | |
| 305 // going to profile. We need to make a copy of the handle because we are | |
| 306 // going to use it in the sampler thread. Using GetThreadHandle() will | |
| 307 // not work in this case. We're using OpenThread because DuplicateHandle | |
| 308 // for some reason doesn't work in Chrome's sandbox. | |
| 309 PlatformData() | |
| 310 : profiled_thread_(OpenThread(THREAD_GET_CONTEXT | | |
| 311 THREAD_SUSPEND_RESUME | | |
| 312 THREAD_QUERY_INFORMATION, | |
| 313 false, | |
| 314 GetCurrentThreadId())) {} | |
| 315 | |
| 316 ~PlatformData() { | |
| 317 if (profiled_thread_ != NULL) { | |
| 318 CloseHandle(profiled_thread_); | |
| 319 profiled_thread_ = NULL; | |
| 320 } | |
| 321 } | |
| 322 | |
| 323 HANDLE profiled_thread() { return profiled_thread_; } | |
| 324 | |
| 325 private: | |
| 326 HANDLE profiled_thread_; | |
| 327 }; | |
| 328 #endif // USE_SIGNALS | |
| 329 | |
| 330 | |
| 331 #if defined(USE_SIGNALS) | |
| 332 class SignalHandler { | |
| 333 public: | |
| 334 static void SetUp() { if (!mutex_) mutex_ = new base::Mutex(); } | |
| 335 static void TearDown() { delete mutex_; mutex_ = NULL; } | |
| 336 | |
| 337 static void IncreaseSamplerCount() { | |
| 338 base::LockGuard<base::Mutex> lock_guard(mutex_); | |
| 339 if (++client_count_ == 1) Install(); | |
| 340 } | |
| 341 | |
| 342 static void DecreaseSamplerCount() { | |
| 343 base::LockGuard<base::Mutex> lock_guard(mutex_); | |
| 344 if (--client_count_ == 0) Restore(); | |
| 345 } | |
| 346 | |
| 347 static bool Installed() { | |
| 348 return signal_handler_installed_; | |
| 349 } | |
| 350 | |
| 351 private: | |
| 352 static void Install() { | |
| 353 #if !V8_OS_NACL | |
| 354 struct sigaction sa; | |
| 355 sa.sa_sigaction = &HandleProfilerSignal; | |
| 356 sigemptyset(&sa.sa_mask); | |
| 357 #if V8_OS_QNX | |
| 358 sa.sa_flags = SA_SIGINFO; | |
| 359 #else | |
| 360 sa.sa_flags = SA_RESTART | SA_SIGINFO; | |
| 361 #endif | |
| 362 signal_handler_installed_ = | |
| 363 (sigaction(SIGPROF, &sa, &old_signal_handler_) == 0); | |
| 364 #endif // !V8_OS_NACL | |
| 365 } | |
| 366 | |
| 367 static void Restore() { | |
| 368 #if !V8_OS_NACL | |
| 369 if (signal_handler_installed_) { | |
| 370 sigaction(SIGPROF, &old_signal_handler_, 0); | |
| 371 signal_handler_installed_ = false; | |
| 372 } | |
| 373 #endif | |
| 374 } | |
| 375 | |
| 376 #if !V8_OS_NACL | |
| 377 static void FillRegisterState(void* context, RegisterState* regs); | |
| 378 static void HandleProfilerSignal(int signal, siginfo_t* info, void* context); | |
| 379 #endif | |
| 380 // Protects the process wide state below. | |
| 381 static base::Mutex* mutex_; | |
| 382 static int client_count_; | |
| 383 static bool signal_handler_installed_; | |
| 384 static struct sigaction old_signal_handler_; | |
| 385 }; | |
| 386 | |
| 387 | |
| 388 base::Mutex* SignalHandler::mutex_ = NULL; | |
| 389 int SignalHandler::client_count_ = 0; | |
| 390 struct sigaction SignalHandler::old_signal_handler_; | |
| 391 bool SignalHandler::signal_handler_installed_ = false; | |
| 392 | |
| 393 | |
| 394 // As Native Client does not support signal handling, profiling is disabled. | |
| 395 #if !V8_OS_NACL | |
| 396 void SignalHandler::HandleProfilerSignal(int signal, siginfo_t* info, | |
| 397 void* context) { | |
| 398 USE(info); | |
| 399 if (signal != SIGPROF) return; | |
| 400 AtomicGuard atomic_guard(&SamplerManager::samplers_access_counter_, false); | |
| 401 if (!atomic_guard.is_success()) return; | |
| 402 pthread_t thread_id = pthread_self(); | |
| 403 HashMap::Entry* entry = | |
| 404 SamplerManager::sampler_map_.Pointer()->Lookup(ThreadKey(thread_id), | |
| 405 ThreadHash(thread_id)); | |
| 406 if (entry == NULL) return; | |
| 407 SamplerList* samplers = reinterpret_cast<SamplerList*>(entry->value); | |
| 408 | |
| 409 v8::RegisterState state; | |
| 410 FillRegisterState(context, &state); | |
| 411 | |
| 412 for (int i = 0; i < samplers->size(); ++i) { | |
| 413 Sampler* sampler = (*samplers)[i]; | |
| 414 Isolate* isolate = sampler->isolate(); | |
| 415 | |
| 416 // We require a fully initialized and entered isolate. | |
| 417 if (isolate == NULL || !isolate->IsInUse()) return; | |
| 418 | |
| 419 if (v8::Locker::IsActive() && !Locker::IsLocked(isolate)) return; | |
| 420 | |
| 421 sampler->SampleStack(state); | |
| 422 } | |
| 423 } | |
| 424 | |
| 425 void SignalHandler::FillRegisterState(void* context, RegisterState* state) { | |
| 426 // Extracting the sample from the context is extremely machine dependent. | |
| 427 ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); | |
| 428 #if !(V8_OS_OPENBSD || (V8_OS_LINUX && (V8_HOST_ARCH_PPC || V8_HOST_ARCH_S390))) | |
| 429 mcontext_t& mcontext = ucontext->uc_mcontext; | |
| 430 #endif | |
| 431 #if V8_OS_LINUX | |
| 432 #if V8_HOST_ARCH_IA32 | |
| 433 state->pc = reinterpret_cast<void*>(mcontext.gregs[REG_EIP]); | |
| 434 state->sp = reinterpret_cast<void*>(mcontext.gregs[REG_ESP]); | |
| 435 state->fp = reinterpret_cast<void*>(mcontext.gregs[REG_EBP]); | |
| 436 #elif V8_HOST_ARCH_X64 | |
| 437 state->pc = reinterpret_cast<void*>(mcontext.gregs[REG_RIP]); | |
| 438 state->sp = reinterpret_cast<void*>(mcontext.gregs[REG_RSP]); | |
| 439 state->fp = reinterpret_cast<void*>(mcontext.gregs[REG_RBP]); | |
| 440 #elif V8_HOST_ARCH_ARM | |
| 441 #if V8_LIBC_GLIBC && !V8_GLIBC_PREREQ(2, 4) | |
| 442 // Old GLibc ARM versions used a gregs[] array to access the register | |
| 443 // values from mcontext_t. | |
| 444 state->pc = reinterpret_cast<void*>(mcontext.gregs[R15]); | |
| 445 state->sp = reinterpret_cast<void*>(mcontext.gregs[R13]); | |
| 446 state->fp = reinterpret_cast<void*>(mcontext.gregs[R11]); | |
| 447 #else | |
| 448 state->pc = reinterpret_cast<void*>(mcontext.arm_pc); | |
| 449 state->sp = reinterpret_cast<void*>(mcontext.arm_sp); | |
| 450 state->fp = reinterpret_cast<void*>(mcontext.arm_fp); | |
| 451 #endif // V8_LIBC_GLIBC && !V8_GLIBC_PREREQ(2, 4) | |
| 452 #elif V8_HOST_ARCH_ARM64 | |
| 453 state->pc = reinterpret_cast<void*>(mcontext.pc); | |
| 454 state->sp = reinterpret_cast<void*>(mcontext.sp); | |
| 455 // FP is an alias for x29. | |
| 456 state->fp = reinterpret_cast<void*>(mcontext.regs[29]); | |
| 457 #elif V8_HOST_ARCH_MIPS | |
| 458 state->pc = reinterpret_cast<void*>(mcontext.pc); | |
| 459 state->sp = reinterpret_cast<void*>(mcontext.gregs[29]); | |
| 460 state->fp = reinterpret_cast<void*>(mcontext.gregs[30]); | |
| 461 #elif V8_HOST_ARCH_MIPS64 | |
| 462 state->pc = reinterpret_cast<void*>(mcontext.pc); | |
| 463 state->sp = reinterpret_cast<void*>(mcontext.gregs[29]); | |
| 464 state->fp = reinterpret_cast<void*>(mcontext.gregs[30]); | |
| 465 #elif V8_HOST_ARCH_PPC | |
| 466 state->pc = reinterpret_cast<void*>(ucontext->uc_mcontext.regs->nip); | |
| 467 state->sp = | |
| 468 reinterpret_cast<void*>(ucontext->uc_mcontext.regs->gpr[PT_R1]); | |
| 469 state->fp = | |
| 470 reinterpret_cast<void*>(ucontext->uc_mcontext.regs->gpr[PT_R31]); | |
| 471 #elif V8_HOST_ARCH_S390 | |
| 472 #if V8_TARGET_ARCH_32_BIT | |
| 473 // 31-bit target will have bit 0 (MSB) of the PSW set to denote addressing | |
| 474 // mode. This bit needs to be masked out to resolve actual address. | |
| 475 state->pc = | |
| 476 reinterpret_cast<void*>(ucontext->uc_mcontext.psw.addr & 0x7FFFFFFF); | |
| 477 #else | |
| 478 state->pc = reinterpret_cast<void*>(ucontext->uc_mcontext.psw.addr); | |
| 479 #endif // V8_TARGET_ARCH_32_BIT | |
| 480 state->sp = reinterpret_cast<void*>(ucontext->uc_mcontext.gregs[15]); | |
| 481 state->fp = reinterpret_cast<void*>(ucontext->uc_mcontext.gregs[11]); | |
| 482 #endif // V8_HOST_ARCH_* | |
| 483 #elif V8_OS_MACOSX | |
| 484 #if V8_HOST_ARCH_X64 | |
| 485 #if __DARWIN_UNIX03 | |
| 486 state->pc = reinterpret_cast<void*>(mcontext->__ss.__rip); | |
| 487 state->sp = reinterpret_cast<void*>(mcontext->__ss.__rsp); | |
| 488 state->fp = reinterpret_cast<void*>(mcontext->__ss.__rbp); | |
| 489 #else // !__DARWIN_UNIX03 | |
| 490 state->pc = reinterpret_cast<void*>(mcontext->ss.rip); | |
| 491 state->sp = reinterpret_cast<void*>(mcontext->ss.rsp); | |
| 492 state->fp = reinterpret_cast<void*>(mcontext->ss.rbp); | |
| 493 #endif // __DARWIN_UNIX03 | |
| 494 #elif V8_HOST_ARCH_IA32 | |
| 495 #if __DARWIN_UNIX03 | |
| 496 state->pc = reinterpret_cast<void*>(mcontext->__ss.__eip); | |
| 497 state->sp = reinterpret_cast<void*>(mcontext->__ss.__esp); | |
| 498 state->fp = reinterpret_cast<void*>(mcontext->__ss.__ebp); | |
| 499 #else // !__DARWIN_UNIX03 | |
| 500 state->pc = reinterpret_cast<void*>(mcontext->ss.eip); | |
| 501 state->sp = reinterpret_cast<void*>(mcontext->ss.esp); | |
| 502 state->fp = reinterpret_cast<void*>(mcontext->ss.ebp); | |
| 503 #endif // __DARWIN_UNIX03 | |
| 504 #endif // V8_HOST_ARCH_IA32 | |
| 505 #elif V8_OS_FREEBSD | |
| 506 #if V8_HOST_ARCH_IA32 | |
| 507 state->pc = reinterpret_cast<void*>(mcontext.mc_eip); | |
| 508 state->sp = reinterpret_cast<void*>(mcontext.mc_esp); | |
| 509 state->fp = reinterpret_cast<void*>(mcontext.mc_ebp); | |
| 510 #elif V8_HOST_ARCH_X64 | |
| 511 state->pc = reinterpret_cast<void*>(mcontext.mc_rip); | |
| 512 state->sp = reinterpret_cast<void*>(mcontext.mc_rsp); | |
| 513 state->fp = reinterpret_cast<void*>(mcontext.mc_rbp); | |
| 514 #elif V8_HOST_ARCH_ARM | |
| 515 state->pc = reinterpret_cast<void*>(mcontext.mc_r15); | |
| 516 state->sp = reinterpret_cast<void*>(mcontext.mc_r13); | |
| 517 state->fp = reinterpret_cast<void*>(mcontext.mc_r11); | |
| 518 #endif // V8_HOST_ARCH_* | |
| 519 #elif V8_OS_NETBSD | |
| 520 #if V8_HOST_ARCH_IA32 | |
| 521 state->pc = reinterpret_cast<void*>(mcontext.__gregs[_REG_EIP]); | |
| 522 state->sp = reinterpret_cast<void*>(mcontext.__gregs[_REG_ESP]); | |
| 523 state->fp = reinterpret_cast<void*>(mcontext.__gregs[_REG_EBP]); | |
| 524 #elif V8_HOST_ARCH_X64 | |
| 525 state->pc = reinterpret_cast<void*>(mcontext.__gregs[_REG_RIP]); | |
| 526 state->sp = reinterpret_cast<void*>(mcontext.__gregs[_REG_RSP]); | |
| 527 state->fp = reinterpret_cast<void*>(mcontext.__gregs[_REG_RBP]); | |
| 528 #endif // V8_HOST_ARCH_* | |
| 529 #elif V8_OS_OPENBSD | |
| 530 #if V8_HOST_ARCH_IA32 | |
| 531 state->pc = reinterpret_cast<void*>(ucontext->sc_eip); | |
| 532 state->sp = reinterpret_cast<void*>(ucontext->sc_esp); | |
| 533 state->fp = reinterpret_cast<void*>(ucontext->sc_ebp); | |
| 534 #elif V8_HOST_ARCH_X64 | |
| 535 state->pc = reinterpret_cast<void*>(ucontext->sc_rip); | |
| 536 state->sp = reinterpret_cast<void*>(ucontext->sc_rsp); | |
| 537 state->fp = reinterpret_cast<void*>(ucontext->sc_rbp); | |
| 538 #endif // V8_HOST_ARCH_* | |
| 539 #elif V8_OS_SOLARIS | |
| 540 state->pc = reinterpret_cast<void*>(mcontext.gregs[REG_PC]); | |
| 541 state->sp = reinterpret_cast<void*>(mcontext.gregs[REG_SP]); | |
| 542 state->fp = reinterpret_cast<void*>(mcontext.gregs[REG_FP]); | |
| 543 #elif V8_OS_QNX | |
| 544 #if V8_HOST_ARCH_IA32 | |
| 545 state->pc = reinterpret_cast<void*>(mcontext.cpu.eip); | |
| 546 state->sp = reinterpret_cast<void*>(mcontext.cpu.esp); | |
| 547 state->fp = reinterpret_cast<void*>(mcontext.cpu.ebp); | |
| 548 #elif V8_HOST_ARCH_ARM | |
| 549 state->pc = reinterpret_cast<void*>(mcontext.cpu.gpr[ARM_REG_PC]); | |
| 550 state->sp = reinterpret_cast<void*>(mcontext.cpu.gpr[ARM_REG_SP]); | |
| 551 state->fp = reinterpret_cast<void*>(mcontext.cpu.gpr[ARM_REG_FP]); | |
| 552 #endif // V8_HOST_ARCH_* | |
| 553 #elif V8_OS_AIX | |
| 554 state->pc = reinterpret_cast<void*>(mcontext.jmp_context.iar); | |
| 555 state->sp = reinterpret_cast<void*>(mcontext.jmp_context.gpr[1]); | |
| 556 state->fp = reinterpret_cast<void*>(mcontext.jmp_context.gpr[31]); | |
| 557 #endif // V8_OS_AIX | |
| 558 } | |
| 559 | |
| 560 #endif // !V8_OS_NACL | |
| 561 | |
| 562 #endif // USE_SIGNALS | |
| 563 | |
| 564 | |
| 565 void Sampler::SetUp() { | |
| 566 #if defined(USE_SIGNALS) | |
| 567 SignalHandler::SetUp(); | |
| 568 #endif | |
| 569 } | |
| 570 | |
| 571 | |
| 572 void Sampler::TearDown() { | |
| 573 #if defined(USE_SIGNALS) | |
| 574 SignalHandler::TearDown(); | |
| 575 #endif | |
| 576 } | |
| 577 | |
| 578 Sampler::Sampler(Isolate* isolate) | |
| 579 : is_counting_samples_(false), | |
| 580 js_sample_count_(0), | |
| 581 external_sample_count_(0), | |
| 582 isolate_(isolate), | |
| 583 profiling_(false), | |
| 584 has_processing_thread_(false), | |
| 585 active_(false), | |
| 586 registered_(false) { | |
| 587 data_ = new PlatformData; | |
| 588 } | |
| 589 | |
| 590 Sampler::~Sampler() { | |
| 591 DCHECK(!IsActive()); | |
| 592 #if defined(USE_SIGNALS) | |
| 593 if (IsRegistered()) { | |
| 594 SamplerManager::RemoveSampler(this); | |
| 595 } | |
| 596 #endif | |
| 597 delete data_; | |
| 598 } | |
| 599 | |
| 600 void Sampler::Start() { | |
| 601 DCHECK(!IsActive()); | |
| 602 SetActive(true); | |
| 603 #if defined(USE_SIGNALS) | |
| 604 SamplerManager::AddSampler(this); | |
| 605 #endif | |
| 606 } | |
| 607 | |
| 608 | |
| 609 void Sampler::Stop() { | |
| 610 #if defined(USE_SIGNALS) | |
| 611 SamplerManager::RemoveSampler(this); | |
| 612 #endif | |
| 613 DCHECK(IsActive()); | |
| 614 SetActive(false); | |
| 615 SetRegistered(false); | |
| 616 } | |
| 617 | |
| 618 | |
| 619 void Sampler::IncreaseProfilingDepth() { | |
| 620 base::NoBarrier_AtomicIncrement(&profiling_, 1); | |
| 621 #if defined(USE_SIGNALS) | |
| 622 SignalHandler::IncreaseSamplerCount(); | |
| 623 #endif | |
| 624 } | |
| 625 | |
| 626 | |
| 627 void Sampler::DecreaseProfilingDepth() { | |
| 628 #if defined(USE_SIGNALS) | |
| 629 SignalHandler::DecreaseSamplerCount(); | |
| 630 #endif | |
| 631 base::NoBarrier_AtomicIncrement(&profiling_, -1); | |
| 632 } | |
| 633 | |
| 634 | |
| 635 #if defined(USE_SIGNALS) | |
| 636 | |
| 637 void Sampler::DoSample() { | |
| 638 if (!SignalHandler::Installed()) return; | |
| 639 if (!IsActive() && !IsRegistered()) { | |
| 640 SamplerManager::AddSampler(this); | |
| 641 SetRegistered(true); | |
| 642 } | |
| 643 pthread_kill(platform_data()->vm_tid(), SIGPROF); | |
| 644 } | |
| 645 | |
| 646 #elif V8_OS_WIN || V8_OS_CYGWIN | |
| 647 | |
| 648 void Sampler::DoSample() { | |
| 649 HANDLE profiled_thread = platform_data()->profiled_thread(); | |
| 650 if (profiled_thread == NULL) return; | |
| 651 | |
| 652 const DWORD kSuspendFailed = static_cast<DWORD>(-1); | |
| 653 if (SuspendThread(profiled_thread) == kSuspendFailed) return; | |
| 654 | |
| 655 // Context used for sampling the register state of the profiled thread. | |
| 656 CONTEXT context; | |
| 657 memset(&context, 0, sizeof(context)); | |
| 658 context.ContextFlags = CONTEXT_FULL; | |
| 659 if (GetThreadContext(profiled_thread, &context) != 0) { | |
| 660 v8::RegisterState state; | |
| 661 #if V8_HOST_ARCH_X64 | |
| 662 state.pc = reinterpret_cast<void*>(context.Rip); | |
| 663 state.sp = reinterpret_cast<void*>(context.Rsp); | |
| 664 state.fp = reinterpret_cast<void*>(context.Rbp); | |
| 665 #else | |
| 666 state.pc = reinterpret_cast<void*>(context.Eip); | |
| 667 state.sp = reinterpret_cast<void*>(context.Esp); | |
| 668 state.fp = reinterpret_cast<void*>(context.Ebp); | |
| 669 #endif | |
| 670 SampleStack(state); | |
| 671 } | |
| 672 ResumeThread(profiled_thread); | |
| 673 } | |
| 674 | |
| 675 #endif // USE_SIGNALS | |
| 676 | |
| 677 } // namespace sampler | |
| 678 } // namespace v8 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2000323007:
Revert of Create libsampler as V8 sampler library. (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master