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| 1 // Copyright 2013 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/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 "src/base/platform/platform.h" | |
| 46 #include "src/cpu-profiler-inl.h" | |
| 47 #include "src/flags.h" | |
| 48 #include "src/frames-inl.h" | |
| 49 #include "src/log.h" | |
| 50 #include "src/simulator.h" | |
| 51 #include "src/v8threads.h" | |
| 52 #include "src/vm-state-inl.h" | |
| 53 | |
| 54 | |
| 55 #if V8_OS_ANDROID && !defined(__BIONIC_HAVE_UCONTEXT_T) | |
| 56 | |
| 57 // Not all versions of Android's C library provide ucontext_t. | |
| 58 // Detect this and provide custom but compatible definitions. Note that these | |
| 59 // follow the GLibc naming convention to access register values from | |
| 60 // mcontext_t. | |
| 61 // | |
| 62 // See http://code.google.com/p/android/issues/detail?id=34784 | |
| 63 | |
| 64 #if defined(__arm__) | |
| 65 | |
| 66 typedef struct sigcontext mcontext_t; | |
| 67 | |
| 68 typedef struct ucontext { | |
| 69 uint32_t uc_flags; | |
| 70 struct ucontext* uc_link; | |
| 71 stack_t uc_stack; | |
| 72 mcontext_t uc_mcontext; | |
| 73 // Other fields are not used by V8, don't define them here. | |
| 74 } ucontext_t; | |
| 75 | |
| 76 #elif defined(__aarch64__) | |
| 77 | |
| 78 typedef struct sigcontext mcontext_t; | |
| 79 | |
| 80 typedef struct ucontext { | |
| 81 uint64_t uc_flags; | |
| 82 struct ucontext *uc_link; | |
| 83 stack_t uc_stack; | |
| 84 mcontext_t uc_mcontext; | |
| 85 // Other fields are not used by V8, don't define them here. | |
| 86 } ucontext_t; | |
| 87 | |
| 88 #elif defined(__mips__) | |
| 89 // MIPS version of sigcontext, for Android bionic. | |
| 90 typedef struct { | |
| 91 uint32_t regmask; | |
| 92 uint32_t status; | |
| 93 uint64_t pc; | |
| 94 uint64_t gregs[32]; | |
| 95 uint64_t fpregs[32]; | |
| 96 uint32_t acx; | |
| 97 uint32_t fpc_csr; | |
| 98 uint32_t fpc_eir; | |
| 99 uint32_t used_math; | |
| 100 uint32_t dsp; | |
| 101 uint64_t mdhi; | |
| 102 uint64_t mdlo; | |
| 103 uint32_t hi1; | |
| 104 uint32_t lo1; | |
| 105 uint32_t hi2; | |
| 106 uint32_t lo2; | |
| 107 uint32_t hi3; | |
| 108 uint32_t lo3; | |
| 109 } mcontext_t; | |
| 110 | |
| 111 typedef struct ucontext { | |
| 112 uint32_t uc_flags; | |
| 113 struct ucontext* uc_link; | |
| 114 stack_t uc_stack; | |
| 115 mcontext_t uc_mcontext; | |
| 116 // Other fields are not used by V8, don't define them here. | |
| 117 } ucontext_t; | |
| 118 | |
| 119 #elif defined(__i386__) | |
| 120 // x86 version for Android. | |
| 121 typedef struct { | |
| 122 uint32_t gregs[19]; | |
| 123 void* fpregs; | |
| 124 uint32_t oldmask; | |
| 125 uint32_t cr2; | |
| 126 } mcontext_t; | |
| 127 | |
| 128 typedef uint32_t kernel_sigset_t[2]; // x86 kernel uses 64-bit signal masks | |
| 129 typedef struct ucontext { | |
| 130 uint32_t uc_flags; | |
| 131 struct ucontext* uc_link; | |
| 132 stack_t uc_stack; | |
| 133 mcontext_t uc_mcontext; | |
| 134 // Other fields are not used by V8, don't define them here. | |
| 135 } ucontext_t; | |
| 136 enum { REG_EBP = 6, REG_ESP = 7, REG_EIP = 14 }; | |
| 137 | |
| 138 #elif defined(__x86_64__) | |
| 139 // x64 version for Android. | |
| 140 typedef struct { | |
| 141 uint64_t gregs[23]; | |
| 142 void* fpregs; | |
| 143 uint64_t __reserved1[8]; | |
| 144 } mcontext_t; | |
| 145 | |
| 146 typedef struct ucontext { | |
| 147 uint64_t uc_flags; | |
| 148 struct ucontext *uc_link; | |
| 149 stack_t uc_stack; | |
| 150 mcontext_t uc_mcontext; | |
| 151 // Other fields are not used by V8, don't define them here. | |
| 152 } ucontext_t; | |
| 153 enum { REG_RBP = 10, REG_RSP = 15, REG_RIP = 16 }; | |
| 154 #endif | |
| 155 | |
| 156 #endif // V8_OS_ANDROID && !defined(__BIONIC_HAVE_UCONTEXT_T) | |
| 157 | |
| 158 | |
| 159 namespace v8 { | |
| 160 namespace internal { | |
| 161 | |
| 162 namespace { | |
| 163 | |
| 164 class PlatformDataCommon : public Malloced { | |
| 165 public: | |
| 166 PlatformDataCommon() : profiled_thread_id_(ThreadId::Current()) {} | |
| 167 ThreadId profiled_thread_id() { return profiled_thread_id_; } | |
| 168 | |
| 169 protected: | |
| 170 ~PlatformDataCommon() {} | |
| 171 | |
| 172 private: | |
| 173 ThreadId profiled_thread_id_; | |
| 174 }; | |
| 175 | |
| 176 | |
| 177 bool IsSamePage(byte* ptr1, byte* ptr2) { | |
| 178 const uint32_t kPageSize = 4096; | |
| 179 uintptr_t mask = ~static_cast<uintptr_t>(kPageSize - 1); | |
| 180 return (reinterpret_cast<uintptr_t>(ptr1) & mask) == | |
| 181 (reinterpret_cast<uintptr_t>(ptr2) & mask); | |
| 182 } | |
| 183 | |
| 184 | |
| 185 // Check if the code at specified address could potentially be a | |
| 186 // frame setup code. | |
| 187 bool IsNoFrameRegion(Address address) { | |
| 188 struct Pattern { | |
| 189 int bytes_count; | |
| 190 byte bytes[8]; | |
| 191 int offsets[4]; | |
| 192 }; | |
| 193 byte* pc = reinterpret_cast<byte*>(address); | |
| 194 static Pattern patterns[] = { | |
| 195 #if V8_HOST_ARCH_IA32 | |
| 196 // push %ebp | |
| 197 // mov %esp,%ebp | |
| 198 {3, {0x55, 0x89, 0xe5}, {0, 1, -1}}, | |
| 199 // pop %ebp | |
| 200 // ret N | |
| 201 {2, {0x5d, 0xc2}, {0, 1, -1}}, | |
| 202 // pop %ebp | |
| 203 // ret | |
| 204 {2, {0x5d, 0xc3}, {0, 1, -1}}, | |
| 205 #elif V8_HOST_ARCH_X64 | |
| 206 // pushq %rbp | |
| 207 // movq %rsp,%rbp | |
| 208 {4, {0x55, 0x48, 0x89, 0xe5}, {0, 1, -1}}, | |
| 209 // popq %rbp | |
| 210 // ret N | |
| 211 {2, {0x5d, 0xc2}, {0, 1, -1}}, | |
| 212 // popq %rbp | |
| 213 // ret | |
| 214 {2, {0x5d, 0xc3}, {0, 1, -1}}, | |
| 215 #endif | |
| 216 {0, {}, {}} | |
| 217 }; | |
| 218 for (Pattern* pattern = patterns; pattern->bytes_count; ++pattern) { | |
| 219 for (int* offset_ptr = pattern->offsets; *offset_ptr != -1; ++offset_ptr) { | |
| 220 int offset = *offset_ptr; | |
| 221 if (!offset || IsSamePage(pc, pc - offset)) { | |
| 222 MSAN_MEMORY_IS_INITIALIZED(pc - offset, pattern->bytes_count); | |
| 223 if (!memcmp(pc - offset, pattern->bytes, pattern->bytes_count)) | |
| 224 return true; | |
| 225 } else { | |
| 226 // It is not safe to examine bytes on another page as it might not be | |
| 227 // allocated thus causing a SEGFAULT. | |
| 228 // Check the pattern part that's on the same page and | |
| 229 // pessimistically assume it could be the entire pattern match. | |
| 230 MSAN_MEMORY_IS_INITIALIZED(pc, pattern->bytes_count - offset); | |
| 231 if (!memcmp(pc, pattern->bytes + offset, pattern->bytes_count - offset)) | |
| 232 return true; | |
| 233 } | |
| 234 } | |
| 235 } | |
| 236 return false; | |
| 237 } | |
| 238 | |
| 239 } // namespace | |
| 240 | |
| 241 #if defined(USE_SIGNALS) | |
| 242 | |
| 243 class Sampler::PlatformData : public PlatformDataCommon { | |
| 244 public: | |
| 245 PlatformData() : vm_tid_(pthread_self()) {} | |
| 246 pthread_t vm_tid() const { return vm_tid_; } | |
| 247 | |
| 248 private: | |
| 249 pthread_t vm_tid_; | |
| 250 }; | |
| 251 | |
| 252 #elif V8_OS_WIN || V8_OS_CYGWIN | |
| 253 | |
| 254 // ---------------------------------------------------------------------------- | |
| 255 // Win32 profiler support. On Cygwin we use the same sampler implementation as | |
| 256 // on Win32. | |
| 257 | |
| 258 class Sampler::PlatformData : public PlatformDataCommon { | |
| 259 public: | |
| 260 // Get a handle to the calling thread. This is the thread that we are | |
| 261 // going to profile. We need to make a copy of the handle because we are | |
| 262 // going to use it in the sampler thread. Using GetThreadHandle() will | |
| 263 // not work in this case. We're using OpenThread because DuplicateHandle | |
| 264 // for some reason doesn't work in Chrome's sandbox. | |
| 265 PlatformData() | |
| 266 : profiled_thread_(OpenThread(THREAD_GET_CONTEXT | | |
| 267 THREAD_SUSPEND_RESUME | | |
| 268 THREAD_QUERY_INFORMATION, | |
| 269 false, | |
| 270 GetCurrentThreadId())) {} | |
| 271 | |
| 272 ~PlatformData() { | |
| 273 if (profiled_thread_ != NULL) { | |
| 274 CloseHandle(profiled_thread_); | |
| 275 profiled_thread_ = NULL; | |
| 276 } | |
| 277 } | |
| 278 | |
| 279 HANDLE profiled_thread() { return profiled_thread_; } | |
| 280 | |
| 281 private: | |
| 282 HANDLE profiled_thread_; | |
| 283 }; | |
| 284 #endif | |
| 285 | |
| 286 | |
| 287 #if defined(USE_SIMULATOR) | |
| 288 class SimulatorHelper { | |
| 289 public: | |
| 290 inline bool Init(Isolate* isolate) { | |
| 291 simulator_ = isolate->thread_local_top()->simulator_; | |
| 292 // Check if there is active simulator. | |
| 293 return simulator_ != NULL; | |
| 294 } | |
| 295 | |
| 296 inline void FillRegisters(v8::RegisterState* state) { | |
| 297 #if V8_TARGET_ARCH_ARM | |
| 298 if (!simulator_->has_bad_pc()) { | |
| 299 state->pc = reinterpret_cast<Address>(simulator_->get_pc()); | |
| 300 } | |
| 301 state->sp = reinterpret_cast<Address>(simulator_->get_register( | |
| 302 Simulator::sp)); | |
| 303 state->fp = reinterpret_cast<Address>(simulator_->get_register( | |
| 304 Simulator::r11)); | |
| 305 #elif V8_TARGET_ARCH_ARM64 | |
| 306 if (simulator_->sp() == 0 || simulator_->fp() == 0) { | |
| 307 // It's possible that the simulator is interrupted while it is updating | |
| 308 // the sp or fp register. ARM64 simulator does this in two steps: | |
| 309 // first setting it to zero and then setting it to a new value. | |
| 310 // Bailout if sp/fp doesn't contain the new value. | |
| 311 // | |
| 312 // FIXME: The above doesn't really solve the issue. | |
| 313 // If a 64-bit target is executed on a 32-bit host even the final | |
| 314 // write is non-atomic, so it might obtain a half of the result. | |
| 315 // Moreover as long as the register set code uses memcpy (as of now), | |
| 316 // it is not guaranteed to be atomic even when both host and target | |
| 317 // are of same bitness. | |
| 318 return; | |
| 319 } | |
| 320 state->pc = reinterpret_cast<Address>(simulator_->pc()); | |
| 321 state->sp = reinterpret_cast<Address>(simulator_->sp()); | |
| 322 state->fp = reinterpret_cast<Address>(simulator_->fp()); | |
| 323 #elif V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64 | |
| 324 if (!simulator_->has_bad_pc()) { | |
| 325 state->pc = reinterpret_cast<Address>(simulator_->get_pc()); | |
| 326 } | |
| 327 state->sp = reinterpret_cast<Address>(simulator_->get_register( | |
| 328 Simulator::sp)); | |
| 329 state->fp = reinterpret_cast<Address>(simulator_->get_register( | |
| 330 Simulator::fp)); | |
| 331 #elif V8_TARGET_ARCH_PPC | |
| 332 if (!simulator_->has_bad_pc()) { | |
| 333 state->pc = reinterpret_cast<Address>(simulator_->get_pc()); | |
| 334 } | |
| 335 state->sp = | |
| 336 reinterpret_cast<Address>(simulator_->get_register(Simulator::sp)); | |
| 337 state->fp = | |
| 338 reinterpret_cast<Address>(simulator_->get_register(Simulator::fp)); | |
| 339 #endif | |
| 340 } | |
| 341 | |
| 342 private: | |
| 343 Simulator* simulator_; | |
| 344 }; | |
| 345 #endif // USE_SIMULATOR | |
| 346 | |
| 347 | |
| 348 #if defined(USE_SIGNALS) | |
| 349 | |
| 350 class SignalHandler : public AllStatic { | |
| 351 public: | |
| 352 static void SetUp() { if (!mutex_) mutex_ = new base::Mutex(); } | |
| 353 static void TearDown() { delete mutex_; mutex_ = NULL; } | |
| 354 | |
| 355 static void IncreaseSamplerCount() { | |
| 356 base::LockGuard<base::Mutex> lock_guard(mutex_); | |
| 357 if (++client_count_ == 1) Install(); | |
| 358 } | |
| 359 | |
| 360 static void DecreaseSamplerCount() { | |
| 361 base::LockGuard<base::Mutex> lock_guard(mutex_); | |
| 362 if (--client_count_ == 0) Restore(); | |
| 363 } | |
| 364 | |
| 365 static bool Installed() { | |
| 366 return signal_handler_installed_; | |
| 367 } | |
| 368 | |
| 369 private: | |
| 370 static void Install() { | |
| 371 #if !V8_OS_NACL | |
| 372 struct sigaction sa; | |
| 373 sa.sa_sigaction = &HandleProfilerSignal; | |
| 374 sigemptyset(&sa.sa_mask); | |
| 375 #if V8_OS_QNX | |
| 376 sa.sa_flags = SA_SIGINFO; | |
| 377 #else | |
| 378 sa.sa_flags = SA_RESTART | SA_SIGINFO; | |
| 379 #endif | |
| 380 signal_handler_installed_ = | |
| 381 (sigaction(SIGPROF, &sa, &old_signal_handler_) == 0); | |
| 382 #endif | |
| 383 } | |
| 384 | |
| 385 static void Restore() { | |
| 386 #if !V8_OS_NACL | |
| 387 if (signal_handler_installed_) { | |
| 388 sigaction(SIGPROF, &old_signal_handler_, 0); | |
| 389 signal_handler_installed_ = false; | |
| 390 } | |
| 391 #endif | |
| 392 } | |
| 393 | |
| 394 #if !V8_OS_NACL | |
| 395 static void HandleProfilerSignal(int signal, siginfo_t* info, void* context); | |
| 396 #endif | |
| 397 // Protects the process wide state below. | |
| 398 static base::Mutex* mutex_; | |
| 399 static int client_count_; | |
| 400 static bool signal_handler_installed_; | |
| 401 static struct sigaction old_signal_handler_; | |
| 402 }; | |
| 403 | |
| 404 | |
| 405 base::Mutex* SignalHandler::mutex_ = NULL; | |
| 406 int SignalHandler::client_count_ = 0; | |
| 407 struct sigaction SignalHandler::old_signal_handler_; | |
| 408 bool SignalHandler::signal_handler_installed_ = false; | |
| 409 | |
| 410 | |
| 411 // As Native Client does not support signal handling, profiling is disabled. | |
| 412 #if !V8_OS_NACL | |
| 413 void SignalHandler::HandleProfilerSignal(int signal, siginfo_t* info, | |
| 414 void* context) { | |
| 415 USE(info); | |
| 416 if (signal != SIGPROF) return; | |
| 417 Isolate* isolate = Isolate::UnsafeCurrent(); | |
| 418 if (isolate == NULL || !isolate->IsInUse()) { | |
| 419 // We require a fully initialized and entered isolate. | |
| 420 return; | |
| 421 } | |
| 422 if (v8::Locker::IsActive() && | |
| 423 !isolate->thread_manager()->IsLockedByCurrentThread()) { | |
| 424 return; | |
| 425 } | |
| 426 | |
| 427 Sampler* sampler = isolate->logger()->sampler(); | |
| 428 if (sampler == NULL) return; | |
| 429 | |
| 430 v8::RegisterState state; | |
| 431 | |
| 432 #if defined(USE_SIMULATOR) | |
| 433 SimulatorHelper helper; | |
| 434 if (!helper.Init(isolate)) return; | |
| 435 helper.FillRegisters(&state); | |
| 436 // It possible that the simulator is interrupted while it is updating | |
| 437 // the sp or fp register. ARM64 simulator does this in two steps: | |
| 438 // first setting it to zero and then setting it to the new value. | |
| 439 // Bailout if sp/fp doesn't contain the new value. | |
| 440 if (state.sp == 0 || state.fp == 0) return; | |
| 441 #else | |
| 442 // Extracting the sample from the context is extremely machine dependent. | |
| 443 ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context); | |
| 444 #if !(V8_OS_OPENBSD || (V8_OS_LINUX && V8_HOST_ARCH_PPC)) | |
| 445 mcontext_t& mcontext = ucontext->uc_mcontext; | |
| 446 #endif | |
| 447 #if V8_OS_LINUX | |
| 448 #if V8_HOST_ARCH_IA32 | |
| 449 state.pc = reinterpret_cast<Address>(mcontext.gregs[REG_EIP]); | |
| 450 state.sp = reinterpret_cast<Address>(mcontext.gregs[REG_ESP]); | |
| 451 state.fp = reinterpret_cast<Address>(mcontext.gregs[REG_EBP]); | |
| 452 #elif V8_HOST_ARCH_X64 | |
| 453 state.pc = reinterpret_cast<Address>(mcontext.gregs[REG_RIP]); | |
| 454 state.sp = reinterpret_cast<Address>(mcontext.gregs[REG_RSP]); | |
| 455 state.fp = reinterpret_cast<Address>(mcontext.gregs[REG_RBP]); | |
| 456 #elif V8_HOST_ARCH_ARM | |
| 457 #if V8_LIBC_GLIBC && !V8_GLIBC_PREREQ(2, 4) | |
| 458 // Old GLibc ARM versions used a gregs[] array to access the register | |
| 459 // values from mcontext_t. | |
| 460 state.pc = reinterpret_cast<Address>(mcontext.gregs[R15]); | |
| 461 state.sp = reinterpret_cast<Address>(mcontext.gregs[R13]); | |
| 462 state.fp = reinterpret_cast<Address>(mcontext.gregs[R11]); | |
| 463 #else | |
| 464 state.pc = reinterpret_cast<Address>(mcontext.arm_pc); | |
| 465 state.sp = reinterpret_cast<Address>(mcontext.arm_sp); | |
| 466 state.fp = reinterpret_cast<Address>(mcontext.arm_fp); | |
| 467 #endif // V8_LIBC_GLIBC && !V8_GLIBC_PREREQ(2, 4) | |
| 468 #elif V8_HOST_ARCH_ARM64 | |
| 469 state.pc = reinterpret_cast<Address>(mcontext.pc); | |
| 470 state.sp = reinterpret_cast<Address>(mcontext.sp); | |
| 471 // FP is an alias for x29. | |
| 472 state.fp = reinterpret_cast<Address>(mcontext.regs[29]); | |
| 473 #elif V8_HOST_ARCH_MIPS | |
| 474 state.pc = reinterpret_cast<Address>(mcontext.pc); | |
| 475 state.sp = reinterpret_cast<Address>(mcontext.gregs[29]); | |
| 476 state.fp = reinterpret_cast<Address>(mcontext.gregs[30]); | |
| 477 #elif V8_HOST_ARCH_MIPS64 | |
| 478 state.pc = reinterpret_cast<Address>(mcontext.pc); | |
| 479 state.sp = reinterpret_cast<Address>(mcontext.gregs[29]); | |
| 480 state.fp = reinterpret_cast<Address>(mcontext.gregs[30]); | |
| 481 #elif V8_HOST_ARCH_PPC | |
| 482 state.pc = reinterpret_cast<Address>(ucontext->uc_mcontext.regs->nip); | |
| 483 state.sp = reinterpret_cast<Address>(ucontext->uc_mcontext.regs->gpr[PT_R1]); | |
| 484 state.fp = reinterpret_cast<Address>(ucontext->uc_mcontext.regs->gpr[PT_R31]); | |
| 485 #endif // V8_HOST_ARCH_* | |
| 486 #elif V8_OS_MACOSX | |
| 487 #if V8_HOST_ARCH_X64 | |
| 488 #if __DARWIN_UNIX03 | |
| 489 state.pc = reinterpret_cast<Address>(mcontext->__ss.__rip); | |
| 490 state.sp = reinterpret_cast<Address>(mcontext->__ss.__rsp); | |
| 491 state.fp = reinterpret_cast<Address>(mcontext->__ss.__rbp); | |
| 492 #else // !__DARWIN_UNIX03 | |
| 493 state.pc = reinterpret_cast<Address>(mcontext->ss.rip); | |
| 494 state.sp = reinterpret_cast<Address>(mcontext->ss.rsp); | |
| 495 state.fp = reinterpret_cast<Address>(mcontext->ss.rbp); | |
| 496 #endif // __DARWIN_UNIX03 | |
| 497 #elif V8_HOST_ARCH_IA32 | |
| 498 #if __DARWIN_UNIX03 | |
| 499 state.pc = reinterpret_cast<Address>(mcontext->__ss.__eip); | |
| 500 state.sp = reinterpret_cast<Address>(mcontext->__ss.__esp); | |
| 501 state.fp = reinterpret_cast<Address>(mcontext->__ss.__ebp); | |
| 502 #else // !__DARWIN_UNIX03 | |
| 503 state.pc = reinterpret_cast<Address>(mcontext->ss.eip); | |
| 504 state.sp = reinterpret_cast<Address>(mcontext->ss.esp); | |
| 505 state.fp = reinterpret_cast<Address>(mcontext->ss.ebp); | |
| 506 #endif // __DARWIN_UNIX03 | |
| 507 #endif // V8_HOST_ARCH_IA32 | |
| 508 #elif V8_OS_FREEBSD | |
| 509 #if V8_HOST_ARCH_IA32 | |
| 510 state.pc = reinterpret_cast<Address>(mcontext.mc_eip); | |
| 511 state.sp = reinterpret_cast<Address>(mcontext.mc_esp); | |
| 512 state.fp = reinterpret_cast<Address>(mcontext.mc_ebp); | |
| 513 #elif V8_HOST_ARCH_X64 | |
| 514 state.pc = reinterpret_cast<Address>(mcontext.mc_rip); | |
| 515 state.sp = reinterpret_cast<Address>(mcontext.mc_rsp); | |
| 516 state.fp = reinterpret_cast<Address>(mcontext.mc_rbp); | |
| 517 #elif V8_HOST_ARCH_ARM | |
| 518 state.pc = reinterpret_cast<Address>(mcontext.mc_r15); | |
| 519 state.sp = reinterpret_cast<Address>(mcontext.mc_r13); | |
| 520 state.fp = reinterpret_cast<Address>(mcontext.mc_r11); | |
| 521 #endif // V8_HOST_ARCH_* | |
| 522 #elif V8_OS_NETBSD | |
| 523 #if V8_HOST_ARCH_IA32 | |
| 524 state.pc = reinterpret_cast<Address>(mcontext.__gregs[_REG_EIP]); | |
| 525 state.sp = reinterpret_cast<Address>(mcontext.__gregs[_REG_ESP]); | |
| 526 state.fp = reinterpret_cast<Address>(mcontext.__gregs[_REG_EBP]); | |
| 527 #elif V8_HOST_ARCH_X64 | |
| 528 state.pc = reinterpret_cast<Address>(mcontext.__gregs[_REG_RIP]); | |
| 529 state.sp = reinterpret_cast<Address>(mcontext.__gregs[_REG_RSP]); | |
| 530 state.fp = reinterpret_cast<Address>(mcontext.__gregs[_REG_RBP]); | |
| 531 #endif // V8_HOST_ARCH_* | |
| 532 #elif V8_OS_OPENBSD | |
| 533 #if V8_HOST_ARCH_IA32 | |
| 534 state.pc = reinterpret_cast<Address>(ucontext->sc_eip); | |
| 535 state.sp = reinterpret_cast<Address>(ucontext->sc_esp); | |
| 536 state.fp = reinterpret_cast<Address>(ucontext->sc_ebp); | |
| 537 #elif V8_HOST_ARCH_X64 | |
| 538 state.pc = reinterpret_cast<Address>(ucontext->sc_rip); | |
| 539 state.sp = reinterpret_cast<Address>(ucontext->sc_rsp); | |
| 540 state.fp = reinterpret_cast<Address>(ucontext->sc_rbp); | |
| 541 #endif // V8_HOST_ARCH_* | |
| 542 #elif V8_OS_SOLARIS | |
| 543 state.pc = reinterpret_cast<Address>(mcontext.gregs[REG_PC]); | |
| 544 state.sp = reinterpret_cast<Address>(mcontext.gregs[REG_SP]); | |
| 545 state.fp = reinterpret_cast<Address>(mcontext.gregs[REG_FP]); | |
| 546 #elif V8_OS_QNX | |
| 547 #if V8_HOST_ARCH_IA32 | |
| 548 state.pc = reinterpret_cast<Address>(mcontext.cpu.eip); | |
| 549 state.sp = reinterpret_cast<Address>(mcontext.cpu.esp); | |
| 550 state.fp = reinterpret_cast<Address>(mcontext.cpu.ebp); | |
| 551 #elif V8_HOST_ARCH_ARM | |
| 552 state.pc = reinterpret_cast<Address>(mcontext.cpu.gpr[ARM_REG_PC]); | |
| 553 state.sp = reinterpret_cast<Address>(mcontext.cpu.gpr[ARM_REG_SP]); | |
| 554 state.fp = reinterpret_cast<Address>(mcontext.cpu.gpr[ARM_REG_FP]); | |
| 555 #endif // V8_HOST_ARCH_* | |
| 556 #elif V8_OS_AIX | |
| 557 state.pc = reinterpret_cast<Address>(mcontext.jmp_context.iar); | |
| 558 state.sp = reinterpret_cast<Address>(mcontext.jmp_context.gpr[1]); | |
| 559 state.fp = reinterpret_cast<Address>(mcontext.jmp_context.gpr[31]); | |
| 560 #endif // V8_OS_AIX | |
| 561 #endif // USE_SIMULATOR | |
| 562 sampler->SampleStack(state); | |
| 563 } | |
| 564 #endif // V8_OS_NACL | |
| 565 | |
| 566 #endif | |
| 567 | |
| 568 | |
| 569 class SamplerThread : public base::Thread { | |
| 570 public: | |
| 571 static const int kSamplerThreadStackSize = 64 * KB; | |
| 572 | |
| 573 explicit SamplerThread(int interval) | |
| 574 : Thread(base::Thread::Options("SamplerThread", kSamplerThreadStackSize)), | |
| 575 interval_(interval) {} | |
| 576 | |
| 577 static void SetUp() { if (!mutex_) mutex_ = new base::Mutex(); } | |
| 578 static void TearDown() { delete mutex_; mutex_ = NULL; } | |
| 579 | |
| 580 static void AddActiveSampler(Sampler* sampler) { | |
| 581 bool need_to_start = false; | |
| 582 base::LockGuard<base::Mutex> lock_guard(mutex_); | |
| 583 if (instance_ == NULL) { | |
| 584 // Start a thread that will send SIGPROF signal to VM threads, | |
| 585 // when CPU profiling will be enabled. | |
| 586 instance_ = new SamplerThread(sampler->interval()); | |
| 587 need_to_start = true; | |
| 588 } | |
| 589 | |
| 590 DCHECK(sampler->IsActive()); | |
| 591 DCHECK(!instance_->active_samplers_.Contains(sampler)); | |
| 592 DCHECK(instance_->interval_ == sampler->interval()); | |
| 593 instance_->active_samplers_.Add(sampler); | |
| 594 | |
| 595 if (need_to_start) instance_->StartSynchronously(); | |
| 596 } | |
| 597 | |
| 598 static void RemoveActiveSampler(Sampler* sampler) { | |
| 599 SamplerThread* instance_to_remove = NULL; | |
| 600 { | |
| 601 base::LockGuard<base::Mutex> lock_guard(mutex_); | |
| 602 | |
| 603 DCHECK(sampler->IsActive()); | |
| 604 bool removed = instance_->active_samplers_.RemoveElement(sampler); | |
| 605 DCHECK(removed); | |
| 606 USE(removed); | |
| 607 | |
| 608 // We cannot delete the instance immediately as we need to Join() the | |
| 609 // thread but we are holding mutex_ and the thread may try to acquire it. | |
| 610 if (instance_->active_samplers_.is_empty()) { | |
| 611 instance_to_remove = instance_; | |
| 612 instance_ = NULL; | |
| 613 } | |
| 614 } | |
| 615 | |
| 616 if (!instance_to_remove) return; | |
| 617 instance_to_remove->Join(); | |
| 618 delete instance_to_remove; | |
| 619 } | |
| 620 | |
| 621 // Implement Thread::Run(). | |
| 622 virtual void Run() { | |
| 623 while (true) { | |
| 624 { | |
| 625 base::LockGuard<base::Mutex> lock_guard(mutex_); | |
| 626 if (active_samplers_.is_empty()) break; | |
| 627 // When CPU profiling is enabled both JavaScript and C++ code is | |
| 628 // profiled. We must not suspend. | |
| 629 for (int i = 0; i < active_samplers_.length(); ++i) { | |
| 630 Sampler* sampler = active_samplers_.at(i); | |
| 631 if (!sampler->IsProfiling()) continue; | |
| 632 sampler->DoSample(); | |
| 633 } | |
| 634 } | |
| 635 base::OS::Sleep(base::TimeDelta::FromMilliseconds(interval_)); | |
| 636 } | |
| 637 } | |
| 638 | |
| 639 private: | |
| 640 // Protects the process wide state below. | |
| 641 static base::Mutex* mutex_; | |
| 642 static SamplerThread* instance_; | |
| 643 | |
| 644 const int interval_; | |
| 645 List<Sampler*> active_samplers_; | |
| 646 | |
| 647 DISALLOW_COPY_AND_ASSIGN(SamplerThread); | |
| 648 }; | |
| 649 | |
| 650 | |
| 651 base::Mutex* SamplerThread::mutex_ = NULL; | |
| 652 SamplerThread* SamplerThread::instance_ = NULL; | |
| 653 | |
| 654 | |
| 655 // | |
| 656 // StackTracer implementation | |
| 657 // | |
| 658 DISABLE_ASAN void TickSample::Init(Isolate* isolate, | |
| 659 const v8::RegisterState& regs, | |
| 660 RecordCEntryFrame record_c_entry_frame) { | |
| 661 timestamp = base::TimeTicks::HighResolutionNow(); | |
| 662 pc = reinterpret_cast<Address>(regs.pc); | |
| 663 state = isolate->current_vm_state(); | |
| 664 | |
| 665 // Avoid collecting traces while doing GC. | |
| 666 if (state == GC) return; | |
| 667 | |
| 668 Address js_entry_sp = isolate->js_entry_sp(); | |
| 669 if (js_entry_sp == 0) return; // Not executing JS now. | |
| 670 | |
| 671 if (pc && IsNoFrameRegion(pc)) { | |
| 672 pc = 0; | |
| 673 return; | |
| 674 } | |
| 675 | |
| 676 ExternalCallbackScope* scope = isolate->external_callback_scope(); | |
| 677 Address handler = Isolate::handler(isolate->thread_local_top()); | |
| 678 // If there is a handler on top of the external callback scope then | |
| 679 // we have already entrered JavaScript again and the external callback | |
| 680 // is not the top function. | |
| 681 if (scope && scope->scope_address() < handler) { | |
| 682 external_callback = scope->callback(); | |
| 683 has_external_callback = true; | |
| 684 } else { | |
| 685 // Sample potential return address value for frameless invocation of | |
| 686 // stubs (we'll figure out later, if this value makes sense). | |
| 687 tos = Memory::Address_at(reinterpret_cast<Address>(regs.sp)); | |
| 688 has_external_callback = false; | |
| 689 } | |
| 690 | |
| 691 SafeStackFrameIterator it(isolate, reinterpret_cast<Address>(regs.fp), | |
| 692 reinterpret_cast<Address>(regs.sp), js_entry_sp); | |
| 693 top_frame_type = it.top_frame_type(); | |
| 694 | |
| 695 SampleInfo info; | |
| 696 GetStackSample(isolate, regs, record_c_entry_frame, | |
| 697 reinterpret_cast<void**>(&stack[0]), kMaxFramesCount, &info); | |
| 698 frames_count = static_cast<unsigned>(info.frames_count); | |
| 699 } | |
| 700 | |
| 701 | |
| 702 void TickSample::GetStackSample(Isolate* isolate, const v8::RegisterState& regs, | |
| 703 RecordCEntryFrame record_c_entry_frame, | |
| 704 void** frames, size_t frames_limit, | |
| 705 v8::SampleInfo* sample_info) { | |
| 706 sample_info->frames_count = 0; | |
| 707 sample_info->vm_state = isolate->current_vm_state(); | |
| 708 if (sample_info->vm_state == GC) return; | |
| 709 | |
| 710 Address js_entry_sp = isolate->js_entry_sp(); | |
| 711 if (js_entry_sp == 0) return; // Not executing JS now. | |
| 712 | |
| 713 SafeStackFrameIterator it(isolate, reinterpret_cast<Address>(regs.fp), | |
| 714 reinterpret_cast<Address>(regs.sp), js_entry_sp); | |
| 715 size_t i = 0; | |
| 716 if (record_c_entry_frame == kIncludeCEntryFrame && !it.done() && | |
| 717 it.top_frame_type() == StackFrame::EXIT) { | |
| 718 frames[i++] = isolate->c_function(); | |
| 719 } | |
| 720 while (!it.done() && i < frames_limit) { | |
| 721 frames[i++] = it.frame()->pc(); | |
| 722 it.Advance(); | |
| 723 } | |
| 724 sample_info->frames_count = i; | |
| 725 } | |
| 726 | |
| 727 | |
| 728 void Sampler::SetUp() { | |
| 729 #if defined(USE_SIGNALS) | |
| 730 SignalHandler::SetUp(); | |
| 731 #endif | |
| 732 SamplerThread::SetUp(); | |
| 733 } | |
| 734 | |
| 735 | |
| 736 void Sampler::TearDown() { | |
| 737 SamplerThread::TearDown(); | |
| 738 #if defined(USE_SIGNALS) | |
| 739 SignalHandler::TearDown(); | |
| 740 #endif | |
| 741 } | |
| 742 | |
| 743 | |
| 744 Sampler::Sampler(Isolate* isolate, int interval) | |
| 745 : isolate_(isolate), | |
| 746 interval_(interval), | |
| 747 profiling_(false), | |
| 748 has_processing_thread_(false), | |
| 749 active_(false), | |
| 750 is_counting_samples_(false), | |
| 751 js_and_external_sample_count_(0) { | |
| 752 data_ = new PlatformData; | |
| 753 } | |
| 754 | |
| 755 | |
| 756 Sampler::~Sampler() { | |
| 757 DCHECK(!IsActive()); | |
| 758 delete data_; | |
| 759 } | |
| 760 | |
| 761 | |
| 762 void Sampler::Start() { | |
| 763 DCHECK(!IsActive()); | |
| 764 SetActive(true); | |
| 765 SamplerThread::AddActiveSampler(this); | |
| 766 } | |
| 767 | |
| 768 | |
| 769 void Sampler::Stop() { | |
| 770 DCHECK(IsActive()); | |
| 771 SamplerThread::RemoveActiveSampler(this); | |
| 772 SetActive(false); | |
| 773 } | |
| 774 | |
| 775 | |
| 776 void Sampler::IncreaseProfilingDepth() { | |
| 777 base::NoBarrier_AtomicIncrement(&profiling_, 1); | |
| 778 #if defined(USE_SIGNALS) | |
| 779 SignalHandler::IncreaseSamplerCount(); | |
| 780 #endif | |
| 781 } | |
| 782 | |
| 783 | |
| 784 void Sampler::DecreaseProfilingDepth() { | |
| 785 #if defined(USE_SIGNALS) | |
| 786 SignalHandler::DecreaseSamplerCount(); | |
| 787 #endif | |
| 788 base::NoBarrier_AtomicIncrement(&profiling_, -1); | |
| 789 } | |
| 790 | |
| 791 | |
| 792 void Sampler::SampleStack(const v8::RegisterState& state) { | |
| 793 TickSample* sample = isolate_->cpu_profiler()->StartTickSample(); | |
| 794 TickSample sample_obj; | |
| 795 if (sample == NULL) sample = &sample_obj; | |
| 796 sample->Init(isolate_, state, TickSample::kIncludeCEntryFrame); | |
| 797 if (is_counting_samples_) { | |
| 798 if (sample->state == JS || sample->state == EXTERNAL) { | |
| 799 ++js_and_external_sample_count_; | |
| 800 } | |
| 801 } | |
| 802 Tick(sample); | |
| 803 if (sample != &sample_obj) { | |
| 804 isolate_->cpu_profiler()->FinishTickSample(); | |
| 805 } | |
| 806 } | |
| 807 | |
| 808 | |
| 809 #if defined(USE_SIGNALS) | |
| 810 | |
| 811 void Sampler::DoSample() { | |
| 812 if (!SignalHandler::Installed()) return; | |
| 813 pthread_kill(platform_data()->vm_tid(), SIGPROF); | |
| 814 } | |
| 815 | |
| 816 #elif V8_OS_WIN || V8_OS_CYGWIN | |
| 817 | |
| 818 void Sampler::DoSample() { | |
| 819 HANDLE profiled_thread = platform_data()->profiled_thread(); | |
| 820 if (profiled_thread == NULL) return; | |
| 821 | |
| 822 #if defined(USE_SIMULATOR) | |
| 823 SimulatorHelper helper; | |
| 824 if (!helper.Init(isolate())) return; | |
| 825 #endif | |
| 826 | |
| 827 const DWORD kSuspendFailed = static_cast<DWORD>(-1); | |
| 828 if (SuspendThread(profiled_thread) == kSuspendFailed) return; | |
| 829 | |
| 830 // Context used for sampling the register state of the profiled thread. | |
| 831 CONTEXT context; | |
| 832 memset(&context, 0, sizeof(context)); | |
| 833 context.ContextFlags = CONTEXT_FULL; | |
| 834 if (GetThreadContext(profiled_thread, &context) != 0) { | |
| 835 v8::RegisterState state; | |
| 836 #if defined(USE_SIMULATOR) | |
| 837 helper.FillRegisters(&state); | |
| 838 #else | |
| 839 #if V8_HOST_ARCH_X64 | |
| 840 state.pc = reinterpret_cast<Address>(context.Rip); | |
| 841 state.sp = reinterpret_cast<Address>(context.Rsp); | |
| 842 state.fp = reinterpret_cast<Address>(context.Rbp); | |
| 843 #else | |
| 844 state.pc = reinterpret_cast<Address>(context.Eip); | |
| 845 state.sp = reinterpret_cast<Address>(context.Esp); | |
| 846 state.fp = reinterpret_cast<Address>(context.Ebp); | |
| 847 #endif | |
| 848 #endif // USE_SIMULATOR | |
| 849 SampleStack(state); | |
| 850 } | |
| 851 ResumeThread(profiled_thread); | |
| 852 } | |
| 853 | |
| 854 #endif // USE_SIGNALS | |
| 855 | |
| 856 | |
| 857 } // namespace internal | |
| 858 } // namespace v8 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1356223004:
Move heap and CPU profilers into a dedicated directory. (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master