Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 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/hashmap.h" |
| 51 | #include "src/base/platform/platform.h" |
| 52 | |
| 53 | #if V8_OS_ANDROID && !defined(__BIONIC_HAVE_UCONTEXT_T) |
| 54 | |
| 55 | // Not all versions of Android's C library provide ucontext_t. |
| 56 | // Detect this and provide custom but compatible definitions. Note that these |
| 57 | // follow the GLibc naming convention to access register values from |
| 58 | // mcontext_t. |
| 59 | // |
| 60 | // See http://code.google.com/p/android/issues/detail?id=34784 |
| 61 | |
| 62 | #if defined(__arm__) |
| 63 | |
| 64 | typedef struct sigcontext mcontext_t; |
| 65 | |
| 66 | typedef struct ucontext { |
| 67 | uint32_t uc_flags; |
| 68 | struct ucontext* uc_link; |
| 69 | stack_t uc_stack; |
| 70 | mcontext_t uc_mcontext; |
| 71 | // Other fields are not used by V8, don't define them here. |
| 72 | } ucontext_t; |
| 73 | |
| 74 | #elif defined(__aarch64__) |
| 75 | |
| 76 | typedef struct sigcontext mcontext_t; |
| 77 | |
| 78 | typedef struct ucontext { |
| 79 | uint64_t uc_flags; |
| 80 | struct ucontext *uc_link; |
| 81 | stack_t uc_stack; |
| 82 | mcontext_t uc_mcontext; |
| 83 | // Other fields are not used by V8, don't define them here. |
| 84 | } ucontext_t; |
| 85 | |
| 86 | #elif defined(__mips__) |
| 87 | // MIPS version of sigcontext, for Android bionic. |
| 88 | typedef struct { |
| 89 | uint32_t regmask; |
| 90 | uint32_t status; |
| 91 | uint64_t pc; |
| 92 | uint64_t gregs[32]; |
| 93 | uint64_t fpregs[32]; |
| 94 | uint32_t acx; |
| 95 | uint32_t fpc_csr; |
| 96 | uint32_t fpc_eir; |
| 97 | uint32_t used_math; |
| 98 | uint32_t dsp; |
| 99 | uint64_t mdhi; |
| 100 | uint64_t mdlo; |
| 101 | uint32_t hi1; |
| 102 | uint32_t lo1; |
| 103 | uint32_t hi2; |
| 104 | uint32_t lo2; |
| 105 | uint32_t hi3; |
| 106 | uint32_t lo3; |
| 107 | } mcontext_t; |
| 108 | |
| 109 | typedef struct ucontext { |
| 110 | uint32_t uc_flags; |
| 111 | struct ucontext* uc_link; |
| 112 | stack_t uc_stack; |
| 113 | mcontext_t uc_mcontext; |
| 114 | // Other fields are not used by V8, don't define them here. |
| 115 | } ucontext_t; |
| 116 | |
| 117 | #elif defined(__i386__) |
| 118 | // x86 version for Android. |
| 119 | typedef struct { |
| 120 | uint32_t gregs[19]; |
| 121 | void* fpregs; |
| 122 | uint32_t oldmask; |
| 123 | uint32_t cr2; |
| 124 | } mcontext_t; |
| 125 | |
| 126 | typedef uint32_t kernel_sigset_t[2]; // x86 kernel uses 64-bit signal masks |
| 127 | typedef struct ucontext { |
| 128 | uint32_t uc_flags; |
| 129 | struct ucontext* uc_link; |
| 130 | stack_t uc_stack; |
| 131 | mcontext_t uc_mcontext; |
| 132 | // Other fields are not used by V8, don't define them here. |
| 133 | } ucontext_t; |
| 134 | enum { REG_EBP = 6, REG_ESP = 7, REG_EIP = 14 }; |
| 135 | |
| 136 | #elif defined(__x86_64__) |
| 137 | // x64 version for Android. |
| 138 | typedef struct { |
| 139 | uint64_t gregs[23]; |
| 140 | void* fpregs; |
| 141 | uint64_t __reserved1[8]; |
| 142 | } mcontext_t; |
| 143 | |
| 144 | typedef struct ucontext { |
| 145 | uint64_t uc_flags; |
| 146 | struct ucontext *uc_link; |
| 147 | stack_t uc_stack; |
| 148 | mcontext_t uc_mcontext; |
| 149 | // Other fields are not used by V8, don't define them here. |
| 150 | } ucontext_t; |
| 151 | enum { REG_RBP = 10, REG_RSP = 15, REG_RIP = 16 }; |
| 152 | #endif |
| 153 | |
| 154 | #endif // V8_OS_ANDROID && !defined(__BIONIC_HAVE_UCONTEXT_T) |
| 155 | |
| 156 | |
| 157 | namespace v8 { |
| 158 | namespace sampler { |
| 159 | |
| 160 | namespace { |
| 161 | |
| 162 | #if defined(USE_SIGNALS) |
| 163 | typedef std::vector<Sampler*> SamplerList; |
| 164 | typedef SamplerList::iterator SamplerListIterator; |
| 165 | typedef base::AtomicValue<bool> AtomicMutex; |
| 166 | |
| 167 | class AtomicGuard { |
| 168 | public: |
| 169 | explicit AtomicGuard(AtomicMutex* atomic, bool is_blocking = true) |
| 170 | : atomic_(atomic), is_success_(false) { |
| 171 | do { |
| 172 | // Use Acquire_Load to gain mutual exclusion. |
| 173 | USE(atomic_->Value()); |
| 174 | is_success_ = atomic_->TrySetValue(false, true); |
| 175 | } while (is_blocking && !is_success_); |
| 176 | } |
| 177 | |
| 178 | bool is_success() const { return is_success_; } |
| 179 | |
| 180 | ~AtomicGuard() { |
| 181 | if (!is_success_) return; |
| 182 | atomic_->SetValue(false); |
| 183 | } |
| 184 | |
| 185 | private: |
| 186 | AtomicMutex* const atomic_; |
| 187 | bool is_success_; |
| 188 | }; |
| 189 | |
| 190 | // Returns key for hash map. |
| 191 | void* ThreadKey(pthread_t thread_id) { |
| 192 | return reinterpret_cast<void*>(thread_id); |
| 193 | } |
| 194 | |
| 195 | // Returns hash value for hash map. |
| 196 | uint32_t ThreadHash(pthread_t thread_id) { |
| 197 | #if V8_OS_MACOSX |
| 198 | return static_cast<uint32_t>(reinterpret_cast<intptr_t>(thread_id)); |
| 199 | #else |
| 200 | return static_cast<uint32_t>(thread_id); |
| 201 | #endif |
| 202 | } |
| 203 | |
| 204 | #endif // USE_SIGNALS |
| 205 | |
| 206 | } // namespace |
| 207 | |
| 208 | #if defined(USE_SIGNALS) |
| 209 | |
| 210 | class Sampler::PlatformData { |
| 211 | public: |
| 212 | PlatformData() : vm_tid_(pthread_self()) {} |
| 213 | pthread_t vm_tid() const { return vm_tid_; } |
| 214 | |
| 215 | private: |
| 216 | pthread_t vm_tid_; |
| 217 | }; |
| 218 | |
| 219 | class SamplerManager { |
| 220 | public: |
| 221 | SamplerManager() : sampler_map_(base::HashMap::PointersMatch) {} |
| 222 | |
| 223 | void AddSampler(Sampler* sampler) { |
| 224 | AtomicGuard atomic_guard(&samplers_access_counter_); |
| 225 | DCHECK(sampler->IsActive() || !sampler->IsRegistered()); |
| 226 | // Add sampler into map if needed. |
| 227 | pthread_t thread_id = sampler->platform_data()->vm_tid(); |
| 228 | base::HashMap::Entry* entry = |
| 229 | sampler_map_.LookupOrInsert(ThreadKey(thread_id), |
| 230 | ThreadHash(thread_id)); |
| 231 | DCHECK(entry != nullptr); |
| 232 | if (entry->value == nullptr) { |
| 233 | SamplerList* samplers = new SamplerList(); |
| 234 | samplers->push_back(sampler); |
| 235 | entry->value = samplers; |
| 236 | } else { |
| 237 | SamplerList* samplers = reinterpret_cast<SamplerList*>(entry->value); |
| 238 | bool exists = false; |
| 239 | for (SamplerListIterator iter = samplers->begin(); |
| 240 | iter != samplers->end(); ++iter) { |
| 241 | if (*iter == sampler) { |
| 242 | exists = true; |
| 243 | break; |
| 244 | } |
| 245 | } |
| 246 | if (!exists) { |
| 247 | samplers->push_back(sampler); |
| 248 | } |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | void RemoveSampler(Sampler* sampler) { |
| 253 | AtomicGuard atomic_guard(&samplers_access_counter_); |
| 254 | DCHECK(sampler->IsActive() || sampler->IsRegistered()); |
| 255 | // Remove sampler from map. |
| 256 | pthread_t thread_id = sampler->platform_data()->vm_tid(); |
| 257 | void* thread_key = ThreadKey(thread_id); |
| 258 | uint32_t thread_hash = ThreadHash(thread_id); |
| 259 | base::HashMap::Entry* entry = sampler_map_.Lookup(thread_key, thread_hash); |
| 260 | DCHECK(entry != nullptr); |
| 261 | SamplerList* samplers = reinterpret_cast<SamplerList*>(entry->value); |
| 262 | for (SamplerListIterator iter = samplers->begin(); iter != samplers->end(); |
| 263 | ++iter) { |
| 264 | if (*iter == sampler) { |
| 265 | samplers->erase(iter); |
| 266 | break; |
| 267 | } |
| 268 | } |
| 269 | if (samplers->empty()) { |
| 270 | sampler_map_.Remove(thread_key, thread_hash); |
| 271 | delete samplers; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | #if defined(USE_SIGNALS) |
| 276 | void DoSample(const v8::RegisterState& state) { |
| 277 | AtomicGuard atomic_guard(&SamplerManager::samplers_access_counter_, false); |
| 278 | if (!atomic_guard.is_success()) return; |
| 279 | pthread_t thread_id = pthread_self(); |
| 280 | base::HashMap::Entry* entry = |
| 281 | sampler_map_.Lookup(ThreadKey(thread_id), ThreadHash(thread_id)); |
| 282 | if (!entry) return; |
| 283 | SamplerList& samplers = *static_cast<SamplerList*>(entry->value); |
| 284 | |
| 285 | for (int i = 0; i < samplers.size(); ++i) { |
| 286 | Sampler* sampler = samplers[i]; |
| 287 | Isolate* isolate = sampler->isolate(); |
| 288 | // We require a fully initialized and entered isolate. |
| 289 | if (isolate == nullptr || !isolate->IsInUse()) continue; |
| 290 | if (v8::Locker::IsActive() && !Locker::IsLocked(isolate)) continue; |
| 291 | sampler->SampleStack(state); |
| 292 | } |
| 293 | } |
| 294 | #endif |
| 295 | |
| 296 | static SamplerManager* instance() { return instance_.Pointer(); } |
| 297 | |
| 298 | private: |
| 299 | base::HashMap sampler_map_; |
| 300 | static AtomicMutex samplers_access_counter_; |
| 301 | static base::LazyInstance<SamplerManager>::type instance_; |
| 302 | }; |
| 303 | |
| 304 | AtomicMutex SamplerManager::samplers_access_counter_; |
| 305 | base::LazyInstance<SamplerManager>::type SamplerManager::instance_ = |
| 306 | LAZY_INSTANCE_INITIALIZER; |
| 307 | |
| 308 | #elif V8_OS_WIN || V8_OS_CYGWIN |
| 309 | |
| 310 | // ---------------------------------------------------------------------------- |
| 311 | // Win32 profiler support. On Cygwin we use the same sampler implementation as |
| 312 | // on Win32. |
| 313 | |
| 314 | class Sampler::PlatformData { |
| 315 | public: |
| 316 | // Get a handle to the calling thread. This is the thread that we are |
| 317 | // going to profile. We need to make a copy of the handle because we are |
| 318 | // going to use it in the sampler thread. Using GetThreadHandle() will |
| 319 | // not work in this case. We're using OpenThread because DuplicateHandle |
| 320 | // for some reason doesn't work in Chrome's sandbox. |
| 321 | PlatformData() |
| 322 | : profiled_thread_(OpenThread(THREAD_GET_CONTEXT | |
| 323 | THREAD_SUSPEND_RESUME | |
| 324 | THREAD_QUERY_INFORMATION, |
| 325 | false, |
| 326 | GetCurrentThreadId())) {} |
| 327 | |
| 328 | ~PlatformData() { |
| 329 | if (profiled_thread_ != nullptr) { |
| 330 | CloseHandle(profiled_thread_); |
| 331 | profiled_thread_ = nullptr; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | HANDLE profiled_thread() { return profiled_thread_; } |
| 336 | |
| 337 | private: |
| 338 | HANDLE profiled_thread_; |
| 339 | }; |
| 340 | #endif // USE_SIGNALS |
| 341 | |
| 342 | |
| 343 | #if defined(USE_SIGNALS) |
| 344 | class SignalHandler { |
| 345 | public: |
| 346 | static void SetUp() { if (!mutex_) mutex_ = new base::Mutex(); } |
| 347 | static void TearDown() { |
| 348 | delete mutex_; |
| 349 | mutex_ = nullptr; |
| 350 | } |
| 351 | |
| 352 | static void IncreaseSamplerCount() { |
| 353 | base::LockGuard<base::Mutex> lock_guard(mutex_); |
| 354 | if (++client_count_ == 1) Install(); |
| 355 | } |
| 356 | |
| 357 | static void DecreaseSamplerCount() { |
| 358 | base::LockGuard<base::Mutex> lock_guard(mutex_); |
| 359 | if (--client_count_ == 0) Restore(); |
| 360 | } |
| 361 | |
| 362 | static bool Installed() { |
| 363 | base::LockGuard<base::Mutex> lock_guard(mutex_); |
| 364 | return signal_handler_installed_; |
| 365 | } |
| 366 | |
| 367 | private: |
| 368 | static void Install() { |
| 369 | #if !V8_OS_NACL |
| 370 | struct sigaction sa; |
| 371 | sa.sa_sigaction = &HandleProfilerSignal; |
| 372 | sigemptyset(&sa.sa_mask); |
| 373 | #if V8_OS_QNX |
| 374 | sa.sa_flags = SA_SIGINFO; |
| 375 | #else |
| 376 | sa.sa_flags = SA_RESTART | SA_SIGINFO; |
| 377 | #endif |
| 378 | signal_handler_installed_ = |
| 379 | (sigaction(SIGPROF, &sa, &old_signal_handler_) == 0); |
| 380 | #endif // !V8_OS_NACL |
| 381 | } |
| 382 | |
| 383 | static void Restore() { |
| 384 | #if !V8_OS_NACL |
| 385 | if (signal_handler_installed_) { |
| 386 | sigaction(SIGPROF, &old_signal_handler_, 0); |
| 387 | signal_handler_installed_ = false; |
| 388 | } |
| 389 | #endif |
| 390 | } |
| 391 | |
| 392 | #if !V8_OS_NACL |
| 393 | static void FillRegisterState(void* context, RegisterState* regs); |
| 394 | static void HandleProfilerSignal(int signal, siginfo_t* info, void* context); |
| 395 | #endif |
| 396 | // Protects the process wide state below. |
| 397 | static base::Mutex* mutex_; |
| 398 | static int client_count_; |
| 399 | static bool signal_handler_installed_; |
| 400 | static struct sigaction old_signal_handler_; |
| 401 | }; |
| 402 | |
| 403 | base::Mutex* SignalHandler::mutex_ = nullptr; |
| 404 | int SignalHandler::client_count_ = 0; |
| 405 | struct sigaction SignalHandler::old_signal_handler_; |
| 406 | bool SignalHandler::signal_handler_installed_ = false; |
| 407 | |
| 408 | |
| 409 | // As Native Client does not support signal handling, profiling is disabled. |
| 410 | #if !V8_OS_NACL |
| 411 | void SignalHandler::HandleProfilerSignal(int signal, siginfo_t* info, |
| 412 | void* context) { |
| 413 | USE(info); |
| 414 | if (signal != SIGPROF) return; |
| 415 | v8::RegisterState state; |
| 416 | FillRegisterState(context, &state); |
| 417 | SamplerManager::instance()->DoSample(state); |
| 418 | } |
| 419 | |
| 420 | void SignalHandler::FillRegisterState(void* context, RegisterState* state) { |
| 421 | // Extracting the sample from the context is extremely machine dependent. |
| 422 | ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); |
| 423 | #if !(V8_OS_OPENBSD || (V8_OS_LINUX && (V8_HOST_ARCH_PPC || V8_HOST_ARCH_S390))) |
| 424 | mcontext_t& mcontext = ucontext->uc_mcontext; |
| 425 | #endif |
| 426 | #if V8_OS_LINUX |
| 427 | #if V8_HOST_ARCH_IA32 |
| 428 | state->pc = reinterpret_cast<void*>(mcontext.gregs[REG_EIP]); |
| 429 | state->sp = reinterpret_cast<void*>(mcontext.gregs[REG_ESP]); |
| 430 | state->fp = reinterpret_cast<void*>(mcontext.gregs[REG_EBP]); |
| 431 | #elif V8_HOST_ARCH_X64 |
| 432 | state->pc = reinterpret_cast<void*>(mcontext.gregs[REG_RIP]); |
| 433 | state->sp = reinterpret_cast<void*>(mcontext.gregs[REG_RSP]); |
| 434 | state->fp = reinterpret_cast<void*>(mcontext.gregs[REG_RBP]); |
| 435 | #elif V8_HOST_ARCH_ARM |
| 436 | #if V8_LIBC_GLIBC && !V8_GLIBC_PREREQ(2, 4) |
| 437 | // Old GLibc ARM versions used a gregs[] array to access the register |
| 438 | // values from mcontext_t. |
| 439 | state->pc = reinterpret_cast<void*>(mcontext.gregs[R15]); |
| 440 | state->sp = reinterpret_cast<void*>(mcontext.gregs[R13]); |
| 441 | state->fp = reinterpret_cast<void*>(mcontext.gregs[R11]); |
| 442 | #else |
| 443 | state->pc = reinterpret_cast<void*>(mcontext.arm_pc); |
| 444 | state->sp = reinterpret_cast<void*>(mcontext.arm_sp); |
| 445 | state->fp = reinterpret_cast<void*>(mcontext.arm_fp); |
| 446 | #endif // V8_LIBC_GLIBC && !V8_GLIBC_PREREQ(2, 4) |
| 447 | #elif V8_HOST_ARCH_ARM64 |
| 448 | state->pc = reinterpret_cast<void*>(mcontext.pc); |
| 449 | state->sp = reinterpret_cast<void*>(mcontext.sp); |
| 450 | // FP is an alias for x29. |
| 451 | state->fp = reinterpret_cast<void*>(mcontext.regs[29]); |
| 452 | #elif V8_HOST_ARCH_MIPS |
| 453 | state->pc = reinterpret_cast<void*>(mcontext.pc); |
| 454 | state->sp = reinterpret_cast<void*>(mcontext.gregs[29]); |
| 455 | state->fp = reinterpret_cast<void*>(mcontext.gregs[30]); |
| 456 | #elif V8_HOST_ARCH_MIPS64 |
| 457 | state->pc = reinterpret_cast<void*>(mcontext.pc); |
| 458 | state->sp = reinterpret_cast<void*>(mcontext.gregs[29]); |
| 459 | state->fp = reinterpret_cast<void*>(mcontext.gregs[30]); |
| 460 | #elif V8_HOST_ARCH_PPC |
| 461 | state->pc = reinterpret_cast<void*>(ucontext->uc_mcontext.regs->nip); |
| 462 | state->sp = |
| 463 | reinterpret_cast<void*>(ucontext->uc_mcontext.regs->gpr[PT_R1]); |
| 464 | state->fp = |
| 465 | reinterpret_cast<void*>(ucontext->uc_mcontext.regs->gpr[PT_R31]); |
| 466 | #elif V8_HOST_ARCH_S390 |
| 467 | #if V8_TARGET_ARCH_32_BIT |
| 468 | // 31-bit target will have bit 0 (MSB) of the PSW set to denote addressing |
| 469 | // mode. This bit needs to be masked out to resolve actual address. |
| 470 | state->pc = |
| 471 | reinterpret_cast<void*>(ucontext->uc_mcontext.psw.addr & 0x7FFFFFFF); |
| 472 | #else |
| 473 | state->pc = reinterpret_cast<void*>(ucontext->uc_mcontext.psw.addr); |
| 474 | #endif // V8_TARGET_ARCH_32_BIT |
| 475 | state->sp = reinterpret_cast<void*>(ucontext->uc_mcontext.gregs[15]); |
| 476 | state->fp = reinterpret_cast<void*>(ucontext->uc_mcontext.gregs[11]); |
| 477 | #endif // V8_HOST_ARCH_* |
| 478 | #elif V8_OS_MACOSX |
| 479 | #if V8_HOST_ARCH_X64 |
| 480 | #if __DARWIN_UNIX03 |
| 481 | state->pc = reinterpret_cast<void*>(mcontext->__ss.__rip); |
| 482 | state->sp = reinterpret_cast<void*>(mcontext->__ss.__rsp); |
| 483 | state->fp = reinterpret_cast<void*>(mcontext->__ss.__rbp); |
| 484 | #else // !__DARWIN_UNIX03 |
| 485 | state->pc = reinterpret_cast<void*>(mcontext->ss.rip); |
| 486 | state->sp = reinterpret_cast<void*>(mcontext->ss.rsp); |
| 487 | state->fp = reinterpret_cast<void*>(mcontext->ss.rbp); |
| 488 | #endif // __DARWIN_UNIX03 |
| 489 | #elif V8_HOST_ARCH_IA32 |
| 490 | #if __DARWIN_UNIX03 |
| 491 | state->pc = reinterpret_cast<void*>(mcontext->__ss.__eip); |
| 492 | state->sp = reinterpret_cast<void*>(mcontext->__ss.__esp); |
| 493 | state->fp = reinterpret_cast<void*>(mcontext->__ss.__ebp); |
| 494 | #else // !__DARWIN_UNIX03 |
| 495 | state->pc = reinterpret_cast<void*>(mcontext->ss.eip); |
| 496 | state->sp = reinterpret_cast<void*>(mcontext->ss.esp); |
| 497 | state->fp = reinterpret_cast<void*>(mcontext->ss.ebp); |
| 498 | #endif // __DARWIN_UNIX03 |
| 499 | #endif // V8_HOST_ARCH_IA32 |
| 500 | #elif V8_OS_FREEBSD |
| 501 | #if V8_HOST_ARCH_IA32 |
| 502 | state->pc = reinterpret_cast<void*>(mcontext.mc_eip); |
| 503 | state->sp = reinterpret_cast<void*>(mcontext.mc_esp); |
| 504 | state->fp = reinterpret_cast<void*>(mcontext.mc_ebp); |
| 505 | #elif V8_HOST_ARCH_X64 |
| 506 | state->pc = reinterpret_cast<void*>(mcontext.mc_rip); |
| 507 | state->sp = reinterpret_cast<void*>(mcontext.mc_rsp); |
| 508 | state->fp = reinterpret_cast<void*>(mcontext.mc_rbp); |
| 509 | #elif V8_HOST_ARCH_ARM |
| 510 | state->pc = reinterpret_cast<void*>(mcontext.mc_r15); |
| 511 | state->sp = reinterpret_cast<void*>(mcontext.mc_r13); |
| 512 | state->fp = reinterpret_cast<void*>(mcontext.mc_r11); |
| 513 | #endif // V8_HOST_ARCH_* |
| 514 | #elif V8_OS_NETBSD |
| 515 | #if V8_HOST_ARCH_IA32 |
| 516 | state->pc = reinterpret_cast<void*>(mcontext.__gregs[_REG_EIP]); |
| 517 | state->sp = reinterpret_cast<void*>(mcontext.__gregs[_REG_ESP]); |
| 518 | state->fp = reinterpret_cast<void*>(mcontext.__gregs[_REG_EBP]); |
| 519 | #elif V8_HOST_ARCH_X64 |
| 520 | state->pc = reinterpret_cast<void*>(mcontext.__gregs[_REG_RIP]); |
| 521 | state->sp = reinterpret_cast<void*>(mcontext.__gregs[_REG_RSP]); |
| 522 | state->fp = reinterpret_cast<void*>(mcontext.__gregs[_REG_RBP]); |
| 523 | #endif // V8_HOST_ARCH_* |
| 524 | #elif V8_OS_OPENBSD |
| 525 | #if V8_HOST_ARCH_IA32 |
| 526 | state->pc = reinterpret_cast<void*>(ucontext->sc_eip); |
| 527 | state->sp = reinterpret_cast<void*>(ucontext->sc_esp); |
| 528 | state->fp = reinterpret_cast<void*>(ucontext->sc_ebp); |
| 529 | #elif V8_HOST_ARCH_X64 |
| 530 | state->pc = reinterpret_cast<void*>(ucontext->sc_rip); |
| 531 | state->sp = reinterpret_cast<void*>(ucontext->sc_rsp); |
| 532 | state->fp = reinterpret_cast<void*>(ucontext->sc_rbp); |
| 533 | #endif // V8_HOST_ARCH_* |
| 534 | #elif V8_OS_SOLARIS |
| 535 | state->pc = reinterpret_cast<void*>(mcontext.gregs[REG_PC]); |
| 536 | state->sp = reinterpret_cast<void*>(mcontext.gregs[REG_SP]); |
| 537 | state->fp = reinterpret_cast<void*>(mcontext.gregs[REG_FP]); |
| 538 | #elif V8_OS_QNX |
| 539 | #if V8_HOST_ARCH_IA32 |
| 540 | state->pc = reinterpret_cast<void*>(mcontext.cpu.eip); |
| 541 | state->sp = reinterpret_cast<void*>(mcontext.cpu.esp); |
| 542 | state->fp = reinterpret_cast<void*>(mcontext.cpu.ebp); |
| 543 | #elif V8_HOST_ARCH_ARM |
| 544 | state->pc = reinterpret_cast<void*>(mcontext.cpu.gpr[ARM_REG_PC]); |
| 545 | state->sp = reinterpret_cast<void*>(mcontext.cpu.gpr[ARM_REG_SP]); |
| 546 | state->fp = reinterpret_cast<void*>(mcontext.cpu.gpr[ARM_REG_FP]); |
| 547 | #endif // V8_HOST_ARCH_* |
| 548 | #elif V8_OS_AIX |
| 549 | state->pc = reinterpret_cast<void*>(mcontext.jmp_context.iar); |
| 550 | state->sp = reinterpret_cast<void*>(mcontext.jmp_context.gpr[1]); |
| 551 | state->fp = reinterpret_cast<void*>(mcontext.jmp_context.gpr[31]); |
| 552 | #endif // V8_OS_AIX |
| 553 | } |
| 554 | |
| 555 | #endif // !V8_OS_NACL |
| 556 | |
| 557 | #endif // USE_SIGNALS |
| 558 | |
| 559 | |
| 560 | void Sampler::SetUp() { |
| 561 | #if defined(USE_SIGNALS) |
| 562 | SignalHandler::SetUp(); |
| 563 | #endif |
| 564 | } |
| 565 | |
| 566 | |
| 567 | void Sampler::TearDown() { |
| 568 | #if defined(USE_SIGNALS) |
| 569 | SignalHandler::TearDown(); |
| 570 | #endif |
| 571 | } |
| 572 | |
| 573 | Sampler::Sampler(Isolate* isolate) |
| 574 | : is_counting_samples_(false), |
| 575 | js_sample_count_(0), |
| 576 | external_sample_count_(0), |
| 577 | isolate_(isolate), |
| 578 | profiling_(false), |
| 579 | has_processing_thread_(false), |
| 580 | active_(false), |
| 581 | registered_(false) { |
| 582 | data_ = new PlatformData; |
| 583 | } |
| 584 | |
| 585 | Sampler::~Sampler() { |
| 586 | DCHECK(!IsActive()); |
| 587 | #if defined(USE_SIGNALS) |
| 588 | if (IsRegistered()) { |
| 589 | SamplerManager::instance()->RemoveSampler(this); |
| 590 | } |
| 591 | #endif |
| 592 | delete data_; |
| 593 | } |
| 594 | |
| 595 | void Sampler::Start() { |
| 596 | DCHECK(!IsActive()); |
| 597 | SetActive(true); |
| 598 | #if defined(USE_SIGNALS) |
| 599 | SamplerManager::instance()->AddSampler(this); |
| 600 | #endif |
| 601 | } |
| 602 | |
| 603 | |
| 604 | void Sampler::Stop() { |
| 605 | #if defined(USE_SIGNALS) |
| 606 | SamplerManager::instance()->RemoveSampler(this); |
| 607 | #endif |
| 608 | DCHECK(IsActive()); |
| 609 | SetActive(false); |
| 610 | SetRegistered(false); |
| 611 | } |
| 612 | |
| 613 | |
| 614 | void Sampler::IncreaseProfilingDepth() { |
| 615 | base::NoBarrier_AtomicIncrement(&profiling_, 1); |
| 616 | #if defined(USE_SIGNALS) |
| 617 | SignalHandler::IncreaseSamplerCount(); |
| 618 | #endif |
| 619 | } |
| 620 | |
| 621 | |
| 622 | void Sampler::DecreaseProfilingDepth() { |
| 623 | #if defined(USE_SIGNALS) |
| 624 | SignalHandler::DecreaseSamplerCount(); |
| 625 | #endif |
| 626 | base::NoBarrier_AtomicIncrement(&profiling_, -1); |
| 627 | } |
| 628 | |
| 629 | |
| 630 | #if defined(USE_SIGNALS) |
| 631 | |
| 632 | void Sampler::DoSample() { |
| 633 | if (!SignalHandler::Installed()) return; |
| 634 | if (!IsActive() && !IsRegistered()) { |
| 635 | SamplerManager::instance()->AddSampler(this); |
| 636 | SetRegistered(true); |
| 637 | } |
| 638 | pthread_kill(platform_data()->vm_tid(), SIGPROF); |
| 639 | } |
| 640 | |
| 641 | #elif V8_OS_WIN || V8_OS_CYGWIN |
| 642 | |
| 643 | void Sampler::DoSample() { |
| 644 | HANDLE profiled_thread = platform_data()->profiled_thread(); |
| 645 | if (profiled_thread == nullptr) return; |
| 646 | |
| 647 | const DWORD kSuspendFailed = static_cast<DWORD>(-1); |
| 648 | if (SuspendThread(profiled_thread) == kSuspendFailed) return; |
| 649 | |
| 650 | // Context used for sampling the register state of the profiled thread. |
| 651 | CONTEXT context; |
| 652 | memset(&context, 0, sizeof(context)); |
| 653 | context.ContextFlags = CONTEXT_FULL; |
| 654 | if (GetThreadContext(profiled_thread, &context) != 0) { |
| 655 | v8::RegisterState state; |
| 656 | #if V8_HOST_ARCH_X64 |
| 657 | state.pc = reinterpret_cast<void*>(context.Rip); |
| 658 | state.sp = reinterpret_cast<void*>(context.Rsp); |
| 659 | state.fp = reinterpret_cast<void*>(context.Rbp); |
| 660 | #else |
| 661 | state.pc = reinterpret_cast<void*>(context.Eip); |
| 662 | state.sp = reinterpret_cast<void*>(context.Esp); |
| 663 | state.fp = reinterpret_cast<void*>(context.Ebp); |
| 664 | #endif |
| 665 | SampleStack(state); |
| 666 | } |
| 667 | ResumeThread(profiled_thread); |
| 668 | } |
| 669 | |
| 670 | #endif // USE_SIGNALS |
| 671 | |
| 672 | } // namespace sampler |
| 673 | } // namespace v8 |