thread.cc revision 3b05e9ba874449dbff65b01b8781001f7d93eea6
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define ATRACE_TAG ATRACE_TAG_DALVIK 18 19#include "thread.h" 20 21#include <cutils/trace.h> 22#include <pthread.h> 23#include <signal.h> 24#include <sys/resource.h> 25#include <sys/time.h> 26 27#include <algorithm> 28#include <bitset> 29#include <cerrno> 30#include <iostream> 31#include <list> 32 33#include "arch/context.h" 34#include "base/mutex.h" 35#include "catch_finder.h" 36#include "class_linker.h" 37#include "class_linker-inl.h" 38#include "cutils/atomic.h" 39#include "cutils/atomic-inline.h" 40#include "debugger.h" 41#include "dex_file-inl.h" 42#include "entrypoints/entrypoint_utils.h" 43#include "entrypoints/quick/quick_alloc_entrypoints.h" 44#include "gc_map.h" 45#include "gc/accounting/card_table-inl.h" 46#include "gc/heap.h" 47#include "gc/space/space.h" 48#include "jni_internal.h" 49#include "mirror/art_field-inl.h" 50#include "mirror/art_method-inl.h" 51#include "mirror/class-inl.h" 52#include "mirror/class_loader.h" 53#include "mirror/object_array-inl.h" 54#include "mirror/stack_trace_element.h" 55#include "monitor.h" 56#include "object_utils.h" 57#include "reflection.h" 58#include "runtime.h" 59#include "scoped_thread_state_change.h" 60#include "ScopedLocalRef.h" 61#include "ScopedUtfChars.h" 62#include "sirt_ref.h" 63#include "stack.h" 64#include "stack_indirect_reference_table.h" 65#include "thread-inl.h" 66#include "thread_list.h" 67#include "utils.h" 68#include "verifier/dex_gc_map.h" 69#include "verify_object-inl.h" 70#include "vmap_table.h" 71#include "well_known_classes.h" 72 73namespace art { 74 75bool Thread::is_started_ = false; 76pthread_key_t Thread::pthread_key_self_; 77ConditionVariable* Thread::resume_cond_ = nullptr; 78 79static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 80 81void Thread::InitCardTable() { 82 card_table_ = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 83} 84 85#if !defined(__APPLE__) 86static void UnimplementedEntryPoint() { 87 UNIMPLEMENTED(FATAL); 88} 89#endif 90 91void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 92 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 93 94void Thread::InitTlsEntryPoints() { 95#if !defined(__APPLE__) // The Mac GCC is too old to accept this code. 96 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 97 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 98 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(quick_entrypoints_)); 99 for (uintptr_t* it = begin; it != end; ++it) { 100 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 101 } 102 begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 103 end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(portable_entrypoints_)); 104 for (uintptr_t* it = begin; it != end; ++it) { 105 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 106 } 107#endif 108 InitEntryPoints(&interpreter_entrypoints_, &jni_entrypoints_, &portable_entrypoints_, 109 &quick_entrypoints_); 110} 111 112void Thread::ResetQuickAllocEntryPointsForThread() { 113 ResetQuickAllocEntryPoints(&quick_entrypoints_); 114} 115 116void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 117 deoptimization_shadow_frame_ = sf; 118} 119 120void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 121 deoptimization_return_value_.SetJ(ret_val.GetJ()); 122} 123 124ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 125 ShadowFrame* sf = deoptimization_shadow_frame_; 126 deoptimization_shadow_frame_ = nullptr; 127 ret_val->SetJ(deoptimization_return_value_.GetJ()); 128 return sf; 129} 130 131void Thread::InitTid() { 132 tid_ = ::art::GetTid(); 133} 134 135void Thread::InitAfterFork() { 136 // One thread (us) survived the fork, but we have a new tid so we need to 137 // update the value stashed in this Thread*. 138 InitTid(); 139} 140 141void* Thread::CreateCallback(void* arg) { 142 Thread* self = reinterpret_cast<Thread*>(arg); 143 Runtime* runtime = Runtime::Current(); 144 if (runtime == nullptr) { 145 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 146 return nullptr; 147 } 148 { 149 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 150 // after self->Init(). 151 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 152 // Check that if we got here we cannot be shutting down (as shutdown should never have started 153 // while threads are being born). 154 CHECK(!runtime->IsShuttingDownLocked()); 155 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 156 Runtime::Current()->EndThreadBirth(); 157 } 158 { 159 ScopedObjectAccess soa(self); 160 161 // Copy peer into self, deleting global reference when done. 162 CHECK(self->jpeer_ != nullptr); 163 self->opeer_ = soa.Decode<mirror::Object*>(self->jpeer_); 164 self->GetJniEnv()->DeleteGlobalRef(self->jpeer_); 165 self->jpeer_ = nullptr; 166 167 { 168 SirtRef<mirror::String> thread_name(self, self->GetThreadName(soa)); 169 self->SetThreadName(thread_name->ToModifiedUtf8().c_str()); 170 } 171 Dbg::PostThreadStart(self); 172 173 // Invoke the 'run' method of our java.lang.Thread. 174 mirror::Object* receiver = self->opeer_; 175 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 176 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 177 } 178 // Detach and delete self. 179 Runtime::Current()->GetThreadList()->Unregister(self); 180 181 return nullptr; 182} 183 184Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, 185 mirror::Object* thread_peer) { 186 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 187 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 188 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 189 // to stop it from going away. 190 if (kIsDebugBuild) { 191 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 192 if (result != nullptr && !result->IsSuspended()) { 193 Locks::thread_list_lock_->AssertHeld(soa.Self()); 194 } 195 } 196 return result; 197} 198 199Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, jobject java_thread) { 200 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 201} 202 203static size_t FixStackSize(size_t stack_size) { 204 // A stack size of zero means "use the default". 205 if (stack_size == 0) { 206 stack_size = Runtime::Current()->GetDefaultStackSize(); 207 } 208 209 // Dalvik used the bionic pthread default stack size for native threads, 210 // so include that here to support apps that expect large native stacks. 211 stack_size += 1 * MB; 212 213 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 214 if (stack_size < PTHREAD_STACK_MIN) { 215 stack_size = PTHREAD_STACK_MIN; 216 } 217 218 // It's likely that callers are trying to ensure they have at least a certain amount of 219 // stack space, so we should add our reserved space on top of what they requested, rather 220 // than implicitly take it away from them. 221 stack_size += Thread::kStackOverflowReservedBytes; 222 223 // Some systems require the stack size to be a multiple of the system page size, so round up. 224 stack_size = RoundUp(stack_size, kPageSize); 225 226 return stack_size; 227} 228 229void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 230 CHECK(java_peer != nullptr); 231 Thread* self = static_cast<JNIEnvExt*>(env)->self; 232 Runtime* runtime = Runtime::Current(); 233 234 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 235 bool thread_start_during_shutdown = false; 236 { 237 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 238 if (runtime->IsShuttingDownLocked()) { 239 thread_start_during_shutdown = true; 240 } else { 241 runtime->StartThreadBirth(); 242 } 243 } 244 if (thread_start_during_shutdown) { 245 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 246 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 247 return; 248 } 249 250 Thread* child_thread = new Thread(is_daemon); 251 // Use global JNI ref to hold peer live while child thread starts. 252 child_thread->jpeer_ = env->NewGlobalRef(java_peer); 253 stack_size = FixStackSize(stack_size); 254 255 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 256 // assign it. 257 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 258 reinterpret_cast<jlong>(child_thread)); 259 260 pthread_t new_pthread; 261 pthread_attr_t attr; 262 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 263 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 264 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 265 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 266 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 267 268 if (pthread_create_result != 0) { 269 // pthread_create(3) failed, so clean up. 270 { 271 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 272 runtime->EndThreadBirth(); 273 } 274 // Manually delete the global reference since Thread::Init will not have been run. 275 env->DeleteGlobalRef(child_thread->jpeer_); 276 child_thread->jpeer_ = nullptr; 277 delete child_thread; 278 child_thread = nullptr; 279 // TODO: remove from thread group? 280 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 281 { 282 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 283 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 284 ScopedObjectAccess soa(env); 285 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 286 } 287 } 288} 289 290void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 291 // This function does all the initialization that must be run by the native thread it applies to. 292 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 293 // we can handshake with the corresponding native thread when it's ready.) Check this native 294 // thread hasn't been through here already... 295 CHECK(Thread::Current() == nullptr); 296 SetUpAlternateSignalStack(); 297 InitCpu(); 298 InitTlsEntryPoints(); 299 RemoveSuspendTrigger(); 300 InitCardTable(); 301 InitTid(); 302 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 303 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 304 pthread_self_ = pthread_self(); 305 CHECK(is_started_); 306 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 307 DCHECK_EQ(Thread::Current(), this); 308 309 thin_lock_thread_id_ = thread_list->AllocThreadId(this); 310 InitStackHwm(); 311 312 jni_env_ = new JNIEnvExt(this, java_vm); 313 thread_list->Register(this); 314} 315 316Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 317 bool create_peer) { 318 Thread* self; 319 Runtime* runtime = Runtime::Current(); 320 if (runtime == nullptr) { 321 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 322 return nullptr; 323 } 324 { 325 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 326 if (runtime->IsShuttingDownLocked()) { 327 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 328 return nullptr; 329 } else { 330 Runtime::Current()->StartThreadBirth(); 331 self = new Thread(as_daemon); 332 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 333 Runtime::Current()->EndThreadBirth(); 334 } 335 } 336 337 CHECK_NE(self->GetState(), kRunnable); 338 self->SetState(kNative); 339 340 // If we're the main thread, ClassLinker won't be created until after we're attached, 341 // so that thread needs a two-stage attach. Regular threads don't need this hack. 342 // In the compiler, all threads need this hack, because no-one's going to be getting 343 // a native peer! 344 if (create_peer) { 345 self->CreatePeer(thread_name, as_daemon, thread_group); 346 } else { 347 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 348 if (thread_name != nullptr) { 349 self->name_->assign(thread_name); 350 ::art::SetThreadName(thread_name); 351 } 352 } 353 354 return self; 355} 356 357void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 358 Runtime* runtime = Runtime::Current(); 359 CHECK(runtime->IsStarted()); 360 JNIEnv* env = jni_env_; 361 362 if (thread_group == nullptr) { 363 thread_group = runtime->GetMainThreadGroup(); 364 } 365 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 366 jint thread_priority = GetNativePriority(); 367 jboolean thread_is_daemon = as_daemon; 368 369 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 370 if (peer.get() == nullptr) { 371 CHECK(IsExceptionPending()); 372 return; 373 } 374 { 375 ScopedObjectAccess soa(this); 376 opeer_ = soa.Decode<mirror::Object*>(peer.get()); 377 } 378 env->CallNonvirtualVoidMethod(peer.get(), 379 WellKnownClasses::java_lang_Thread, 380 WellKnownClasses::java_lang_Thread_init, 381 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 382 AssertNoPendingException(); 383 384 Thread* self = this; 385 DCHECK_EQ(self, Thread::Current()); 386 jni_env_->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 387 reinterpret_cast<jlong>(self)); 388 389 ScopedObjectAccess soa(self); 390 SirtRef<mirror::String> peer_thread_name(soa.Self(), GetThreadName(soa)); 391 if (peer_thread_name.get() == nullptr) { 392 // The Thread constructor should have set the Thread.name to a 393 // non-null value. However, because we can run without code 394 // available (in the compiler, in tests), we manually assign the 395 // fields the constructor should have set. 396 if (runtime->IsActiveTransaction()) { 397 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 398 } else { 399 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 400 } 401 peer_thread_name.reset(GetThreadName(soa)); 402 } 403 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 404 if (peer_thread_name.get() != nullptr) { 405 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 406 } 407} 408 409template<bool kTransactionActive> 410void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 411 jobject thread_name, jint thread_priority) { 412 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 413 SetBoolean<kTransactionActive>(opeer_, thread_is_daemon); 414 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 415 SetObject<kTransactionActive>(opeer_, soa.Decode<mirror::Object*>(thread_group)); 416 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 417 SetObject<kTransactionActive>(opeer_, soa.Decode<mirror::Object*>(thread_name)); 418 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 419 SetInt<kTransactionActive>(opeer_, thread_priority); 420} 421 422void Thread::SetThreadName(const char* name) { 423 name_->assign(name); 424 ::art::SetThreadName(name); 425 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 426} 427 428void Thread::InitStackHwm() { 429 void* stack_base; 430 size_t stack_size; 431 GetThreadStack(pthread_self_, &stack_base, &stack_size); 432 433 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 434 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", stack_base, PrettySize(stack_size).c_str()); 435 436 stack_begin_ = reinterpret_cast<byte*>(stack_base); 437 stack_size_ = stack_size; 438 439 if (stack_size_ <= kStackOverflowReservedBytes) { 440 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << stack_size_ << " bytes)"; 441 } 442 443 // TODO: move this into the Linux GetThreadStack implementation. 444#if !defined(__APPLE__) 445 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 446 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 447 // will be broken because we'll die long before we get close to 2GB. 448 bool is_main_thread = (::art::GetTid() == getpid()); 449 if (is_main_thread) { 450 rlimit stack_limit; 451 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 452 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 453 } 454 if (stack_limit.rlim_cur == RLIM_INFINITY) { 455 // Find the default stack size for new threads... 456 pthread_attr_t default_attributes; 457 size_t default_stack_size; 458 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 459 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 460 "default stack size query"); 461 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 462 463 // ...and use that as our limit. 464 size_t old_stack_size = stack_size_; 465 stack_size_ = default_stack_size; 466 stack_begin_ += (old_stack_size - stack_size_); 467 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 468 << " to " << PrettySize(stack_size_) 469 << " with base " << reinterpret_cast<void*>(stack_begin_); 470 } 471 } 472#endif 473 474 // Set stack_end_ to the bottom of the stack saving space of stack overflows 475 ResetDefaultStackEnd(); 476 477 // Sanity check. 478 int stack_variable; 479 CHECK_GT(&stack_variable, reinterpret_cast<void*>(stack_end_)); 480} 481 482void Thread::ShortDump(std::ostream& os) const { 483 os << "Thread["; 484 if (GetThreadId() != 0) { 485 // If we're in kStarting, we won't have a thin lock id or tid yet. 486 os << GetThreadId() 487 << ",tid=" << GetTid() << ','; 488 } 489 os << GetState() 490 << ",Thread*=" << this 491 << ",peer=" << opeer_ 492 << ",\"" << *name_ << "\"" 493 << "]"; 494} 495 496void Thread::Dump(std::ostream& os) const { 497 DumpState(os); 498 DumpStack(os); 499} 500 501mirror::String* Thread::GetThreadName(const ScopedObjectAccessUnchecked& soa) const { 502 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 503 return (opeer_ != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(opeer_)) : nullptr; 504} 505 506void Thread::GetThreadName(std::string& name) const { 507 name.assign(*name_); 508} 509 510uint64_t Thread::GetCpuMicroTime() const { 511#if defined(HAVE_POSIX_CLOCKS) 512 clockid_t cpu_clock_id; 513 pthread_getcpuclockid(pthread_self_, &cpu_clock_id); 514 timespec now; 515 clock_gettime(cpu_clock_id, &now); 516 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 517#else 518 UNIMPLEMENTED(WARNING); 519 return -1; 520#endif 521} 522 523void Thread::AtomicSetFlag(ThreadFlag flag) { 524 android_atomic_or(flag, &state_and_flags_.as_int); 525} 526 527void Thread::AtomicClearFlag(ThreadFlag flag) { 528 android_atomic_and(-1 ^ flag, &state_and_flags_.as_int); 529} 530 531// Attempt to rectify locks so that we dump thread list with required locks before exiting. 532static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 533 LOG(ERROR) << *thread << " suspend count already zero."; 534 Locks::thread_suspend_count_lock_->Unlock(self); 535 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 536 Locks::mutator_lock_->SharedTryLock(self); 537 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 538 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 539 } 540 } 541 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 542 Locks::thread_list_lock_->TryLock(self); 543 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 544 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 545 } 546 } 547 std::ostringstream ss; 548 Runtime::Current()->GetThreadList()->DumpLocked(ss); 549 LOG(FATAL) << ss.str(); 550} 551 552void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 553 DCHECK(delta == -1 || delta == +1 || delta == -debug_suspend_count_) 554 << delta << " " << debug_suspend_count_ << " " << this; 555 DCHECK_GE(suspend_count_, debug_suspend_count_) << this; 556 Locks::thread_suspend_count_lock_->AssertHeld(self); 557 if (this != self && !IsSuspended()) { 558 Locks::thread_list_lock_->AssertHeld(self); 559 } 560 if (UNLIKELY(delta < 0 && suspend_count_ <= 0)) { 561 UnsafeLogFatalForSuspendCount(self, this); 562 return; 563 } 564 565 suspend_count_ += delta; 566 if (for_debugger) { 567 debug_suspend_count_ += delta; 568 } 569 570 if (suspend_count_ == 0) { 571 AtomicClearFlag(kSuspendRequest); 572 } else { 573 AtomicSetFlag(kSuspendRequest); 574 TriggerSuspend(); 575 } 576} 577 578void Thread::RunCheckpointFunction() { 579 Closure *checkpoints[kMaxCheckpoints]; 580 581 // Grab the suspend_count lock and copy the current set of 582 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 583 // function will also grab this lock so we prevent a race between setting 584 // the kCheckpointRequest flag and clearing it. 585 { 586 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 587 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 588 checkpoints[i] = checkpoint_functions_[i]; 589 checkpoint_functions_[i] = nullptr; 590 } 591 AtomicClearFlag(kCheckpointRequest); 592 } 593 594 // Outside the lock, run all the checkpoint functions that 595 // we collected. 596 bool found_checkpoint = false; 597 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 598 if (checkpoints[i] != nullptr) { 599 ATRACE_BEGIN("Checkpoint function"); 600 checkpoints[i]->Run(this); 601 ATRACE_END(); 602 found_checkpoint = true; 603 } 604 } 605 CHECK(found_checkpoint); 606} 607 608bool Thread::RequestCheckpoint(Closure* function) { 609 union StateAndFlags old_state_and_flags; 610 old_state_and_flags.as_int = state_and_flags_.as_int; 611 if (old_state_and_flags.as_struct.state != kRunnable) { 612 return false; // Fail, thread is suspended and so can't run a checkpoint. 613 } 614 615 uint32_t available_checkpoint = kMaxCheckpoints; 616 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 617 if (checkpoint_functions_[i] == nullptr) { 618 available_checkpoint = i; 619 break; 620 } 621 } 622 if (available_checkpoint == kMaxCheckpoints) { 623 // No checkpoint functions available, we can't run a checkpoint 624 return false; 625 } 626 checkpoint_functions_[available_checkpoint] = function; 627 628 // Checkpoint function installed now install flag bit. 629 // We must be runnable to request a checkpoint. 630 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 631 union StateAndFlags new_state_and_flags; 632 new_state_and_flags.as_int = old_state_and_flags.as_int; 633 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 634 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 635 &state_and_flags_.as_int); 636 if (UNLIKELY(succeeded != 0)) { 637 // The thread changed state before the checkpoint was installed. 638 CHECK_EQ(checkpoint_functions_[available_checkpoint], function); 639 checkpoint_functions_[available_checkpoint] = nullptr; 640 } else { 641 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 642 TriggerSuspend(); 643 } 644 return succeeded == 0; 645} 646 647void Thread::FullSuspendCheck() { 648 VLOG(threads) << this << " self-suspending"; 649 ATRACE_BEGIN("Full suspend check"); 650 // Make thread appear suspended to other threads, release mutator_lock_. 651 TransitionFromRunnableToSuspended(kSuspended); 652 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 653 TransitionFromSuspendedToRunnable(); 654 ATRACE_END(); 655 VLOG(threads) << this << " self-reviving"; 656} 657 658void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 659 std::string group_name; 660 int priority; 661 bool is_daemon = false; 662 Thread* self = Thread::Current(); 663 664 if (self != nullptr && thread != nullptr && thread->opeer_ != nullptr) { 665 ScopedObjectAccessUnchecked soa(self); 666 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)->GetInt(thread->opeer_); 667 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)->GetBoolean(thread->opeer_); 668 669 mirror::Object* thread_group = 670 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->opeer_); 671 672 if (thread_group != nullptr) { 673 mirror::ArtField* group_name_field = 674 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 675 mirror::String* group_name_string = 676 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 677 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 678 } 679 } else { 680 priority = GetNativePriority(); 681 } 682 683 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 684 if (scheduler_group_name.empty()) { 685 scheduler_group_name = "default"; 686 } 687 688 if (thread != nullptr) { 689 os << '"' << *thread->name_ << '"'; 690 if (is_daemon) { 691 os << " daemon"; 692 } 693 os << " prio=" << priority 694 << " tid=" << thread->GetThreadId() 695 << " " << thread->GetState(); 696 if (thread->IsStillStarting()) { 697 os << " (still starting up)"; 698 } 699 os << "\n"; 700 } else { 701 os << '"' << ::art::GetThreadName(tid) << '"' 702 << " prio=" << priority 703 << " (not attached)\n"; 704 } 705 706 if (thread != nullptr) { 707 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 708 os << " | group=\"" << group_name << "\"" 709 << " sCount=" << thread->suspend_count_ 710 << " dsCount=" << thread->debug_suspend_count_ 711 << " obj=" << reinterpret_cast<void*>(thread->opeer_) 712 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 713 } 714 715 os << " | sysTid=" << tid 716 << " nice=" << getpriority(PRIO_PROCESS, tid) 717 << " cgrp=" << scheduler_group_name; 718 if (thread != nullptr) { 719 int policy; 720 sched_param sp; 721 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->pthread_self_, &policy, &sp), __FUNCTION__); 722 os << " sched=" << policy << "/" << sp.sched_priority 723 << " handle=" << reinterpret_cast<void*>(thread->pthread_self_); 724 } 725 os << "\n"; 726 727 // Grab the scheduler stats for this thread. 728 std::string scheduler_stats; 729 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 730 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 731 } else { 732 scheduler_stats = "0 0 0"; 733 } 734 735 char native_thread_state = '?'; 736 int utime = 0; 737 int stime = 0; 738 int task_cpu = 0; 739 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 740 741 os << " | state=" << native_thread_state 742 << " schedstat=( " << scheduler_stats << " )" 743 << " utm=" << utime 744 << " stm=" << stime 745 << " core=" << task_cpu 746 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 747 if (thread != nullptr) { 748 os << " | stack=" << reinterpret_cast<void*>(thread->stack_begin_) << "-" << reinterpret_cast<void*>(thread->stack_end_) 749 << " stackSize=" << PrettySize(thread->stack_size_) << "\n"; 750 } 751} 752 753void Thread::DumpState(std::ostream& os) const { 754 Thread::DumpState(os, this, GetTid()); 755} 756 757struct StackDumpVisitor : public StackVisitor { 758 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 759 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 760 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 761 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 762 } 763 764 virtual ~StackDumpVisitor() { 765 if (frame_count == 0) { 766 os << " (no managed stack frames)\n"; 767 } 768 } 769 770 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 771 mirror::ArtMethod* m = GetMethod(); 772 if (m->IsRuntimeMethod()) { 773 return true; 774 } 775 const int kMaxRepetition = 3; 776 mirror::Class* c = m->GetDeclaringClass(); 777 mirror::DexCache* dex_cache = c->GetDexCache(); 778 int line_number = -1; 779 if (dex_cache != nullptr) { // be tolerant of bad input 780 const DexFile& dex_file = *dex_cache->GetDexFile(); 781 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 782 } 783 if (line_number == last_line_number && last_method == m) { 784 ++repetition_count; 785 } else { 786 if (repetition_count >= kMaxRepetition) { 787 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 788 } 789 repetition_count = 0; 790 last_line_number = line_number; 791 last_method = m; 792 } 793 if (repetition_count < kMaxRepetition) { 794 os << " at " << PrettyMethod(m, false); 795 if (m->IsNative()) { 796 os << "(Native method)"; 797 } else { 798 mh.ChangeMethod(m); 799 const char* source_file(mh.GetDeclaringClassSourceFile()); 800 os << "(" << (source_file != nullptr ? source_file : "unavailable") 801 << ":" << line_number << ")"; 802 } 803 os << "\n"; 804 if (frame_count == 0) { 805 Monitor::DescribeWait(os, thread); 806 } 807 if (can_allocate) { 808 Monitor::VisitLocks(this, DumpLockedObject, &os); 809 } 810 } 811 812 ++frame_count; 813 return true; 814 } 815 816 static void DumpLockedObject(mirror::Object* o, void* context) 817 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 818 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 819 os << " - locked <" << o << "> (a " << PrettyTypeOf(o) << ")\n"; 820 } 821 822 std::ostream& os; 823 const Thread* thread; 824 const bool can_allocate; 825 MethodHelper mh; 826 mirror::ArtMethod* last_method; 827 int last_line_number; 828 int repetition_count; 829 int frame_count; 830}; 831 832static bool ShouldShowNativeStack(const Thread* thread) 833 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 834 ThreadState state = thread->GetState(); 835 836 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 837 if (state > kWaiting && state < kStarting) { 838 return true; 839 } 840 841 // In an Object.wait variant or Thread.sleep? That's not interesting. 842 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 843 return false; 844 } 845 846 // In some other native method? That's interesting. 847 // We don't just check kNative because native methods will be in state kSuspended if they're 848 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 849 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 850 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 851 return current_method != nullptr && current_method->IsNative(); 852} 853 854void Thread::DumpStack(std::ostream& os) const { 855 // TODO: we call this code when dying but may not have suspended the thread ourself. The 856 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 857 // the race with the thread_suspend_count_lock_). 858 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 859 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 860 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 861 // If we're currently in native code, dump that stack before dumping the managed stack. 862 if (dump_for_abort || ShouldShowNativeStack(this)) { 863 DumpKernelStack(os, GetTid(), " kernel: ", false); 864 SirtRef<mirror::ArtMethod> method_ref(Thread::Current(), GetCurrentMethod(nullptr)); 865 DumpNativeStack(os, GetTid(), " native: ", false, method_ref.get()); 866 } 867 UniquePtr<Context> context(Context::Create()); 868 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), !throwing_OutOfMemoryError_); 869 dumper.WalkStack(); 870 } else { 871 os << "Not able to dump stack of thread that isn't suspended"; 872 } 873} 874 875void Thread::ThreadExitCallback(void* arg) { 876 Thread* self = reinterpret_cast<Thread*>(arg); 877 if (self->thread_exit_check_count_ == 0) { 878 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's going to use a pthread_key_create destructor?): " << *self; 879 CHECK(is_started_); 880 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 881 self->thread_exit_check_count_ = 1; 882 } else { 883 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 884 } 885} 886 887void Thread::Startup() { 888 CHECK(!is_started_); 889 is_started_ = true; 890 { 891 // MutexLock to keep annotalysis happy. 892 // 893 // Note we use nullptr for the thread because Thread::Current can 894 // return garbage since (is_started_ == true) and 895 // Thread::pthread_key_self_ is not yet initialized. 896 // This was seen on glibc. 897 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 898 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 899 *Locks::thread_suspend_count_lock_); 900 } 901 902 // Allocate a TLS slot. 903 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 904 905 // Double-check the TLS slot allocation. 906 if (pthread_getspecific(pthread_key_self_) != nullptr) { 907 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 908 } 909} 910 911void Thread::FinishStartup() { 912 Runtime* runtime = Runtime::Current(); 913 CHECK(runtime->IsStarted()); 914 915 // Finish attaching the main thread. 916 ScopedObjectAccess soa(Thread::Current()); 917 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 918 919 Runtime::Current()->GetClassLinker()->RunRootClinits(); 920} 921 922void Thread::Shutdown() { 923 CHECK(is_started_); 924 is_started_ = false; 925 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 926 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 927 if (resume_cond_ != nullptr) { 928 delete resume_cond_; 929 resume_cond_ = nullptr; 930 } 931} 932 933Thread::Thread(bool daemon) 934 : suspend_count_(0), 935 card_table_(nullptr), 936 exception_(nullptr), 937 stack_end_(nullptr), 938 managed_stack_(), 939 jni_env_(nullptr), 940 self_(nullptr), 941 opeer_(nullptr), 942 jpeer_(nullptr), 943 stack_begin_(nullptr), 944 stack_size_(0), 945 thin_lock_thread_id_(0), 946 stack_trace_sample_(nullptr), 947 trace_clock_base_(0), 948 tid_(0), 949 wait_mutex_(new Mutex("a thread wait mutex")), 950 wait_cond_(new ConditionVariable("a thread wait condition variable", *wait_mutex_)), 951 wait_monitor_(nullptr), 952 interrupted_(false), 953 wait_next_(nullptr), 954 monitor_enter_object_(nullptr), 955 top_sirt_(nullptr), 956 runtime_(nullptr), 957 class_loader_override_(nullptr), 958 long_jump_context_(nullptr), 959 throwing_OutOfMemoryError_(false), 960 debug_suspend_count_(0), 961 debug_invoke_req_(new DebugInvokeReq), 962 single_step_control_(new SingleStepControl), 963 deoptimization_shadow_frame_(nullptr), 964 instrumentation_stack_(new std::deque<instrumentation::InstrumentationStackFrame>), 965 name_(new std::string(kThreadNameDuringStartup)), 966 daemon_(daemon), 967 pthread_self_(0), 968 no_thread_suspension_(0), 969 last_no_thread_suspension_cause_(nullptr), 970 thread_exit_check_count_(0), 971 thread_local_start_(nullptr), 972 thread_local_pos_(nullptr), 973 thread_local_end_(nullptr), 974 thread_local_objects_(0), 975 thread_local_alloc_stack_top_(nullptr), 976 thread_local_alloc_stack_end_(nullptr) { 977 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 978 state_and_flags_.as_struct.flags = 0; 979 state_and_flags_.as_struct.state = kNative; 980 memset(&held_mutexes_[0], 0, sizeof(held_mutexes_)); 981 memset(rosalloc_runs_, 0, sizeof(rosalloc_runs_)); 982 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 983 checkpoint_functions_[i] = nullptr; 984 } 985} 986 987bool Thread::IsStillStarting() const { 988 // You might think you can check whether the state is kStarting, but for much of thread startup, 989 // the thread is in kNative; it might also be in kVmWait. 990 // You might think you can check whether the peer is nullptr, but the peer is actually created and 991 // assigned fairly early on, and needs to be. 992 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 993 // this thread _ever_ entered kRunnable". 994 return (jpeer_ == nullptr && opeer_ == nullptr) || (*name_ == kThreadNameDuringStartup); 995} 996 997void Thread::AssertNoPendingException() const { 998 if (UNLIKELY(IsExceptionPending())) { 999 ScopedObjectAccess soa(Thread::Current()); 1000 mirror::Throwable* exception = GetException(nullptr); 1001 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1002 } 1003} 1004 1005void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1006 if (UNLIKELY(IsExceptionPending())) { 1007 ScopedObjectAccess soa(Thread::Current()); 1008 mirror::Throwable* exception = GetException(nullptr); 1009 LOG(FATAL) << "Throwing new exception " << msg << " with unexpected pending exception: " 1010 << exception->Dump(); 1011 } 1012} 1013 1014static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1015 RootType /*root_type*/) 1016 NO_THREAD_SAFETY_ANALYSIS { 1017 Thread* self = reinterpret_cast<Thread*>(arg); 1018 mirror::Object* entered_monitor = *object; 1019 if (self->HoldsLock(entered_monitor)) { 1020 LOG(WARNING) << "Calling MonitorExit on object " 1021 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1022 << " left locked by native thread " 1023 << *Thread::Current() << " which is detaching"; 1024 entered_monitor->MonitorExit(self); 1025 } 1026} 1027 1028void Thread::Destroy() { 1029 Thread* self = this; 1030 DCHECK_EQ(self, Thread::Current()); 1031 1032 if (opeer_ != nullptr) { 1033 ScopedObjectAccess soa(self); 1034 // We may need to call user-supplied managed code, do this before final clean-up. 1035 HandleUncaughtExceptions(soa); 1036 RemoveFromThreadGroup(soa); 1037 1038 // this.nativePeer = 0; 1039 if (Runtime::Current()->IsActiveTransaction()) { 1040 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong<true>(opeer_, 0); 1041 } else { 1042 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong<false>(opeer_, 0); 1043 } 1044 Dbg::PostThreadDeath(self); 1045 1046 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1047 // who is waiting. 1048 mirror::Object* lock = 1049 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 1050 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1051 if (lock != nullptr) { 1052 SirtRef<mirror::Object> sirt_obj(self, lock); 1053 ObjectLock<mirror::Object> locker(self, &sirt_obj); 1054 locker.Notify(); 1055 } 1056 } 1057 1058 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1059 if (jni_env_ != nullptr) { 1060 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1061 } 1062} 1063 1064Thread::~Thread() { 1065 if (jni_env_ != nullptr && jpeer_ != nullptr) { 1066 // If pthread_create fails we don't have a jni env here. 1067 jni_env_->DeleteGlobalRef(jpeer_); 1068 jpeer_ = nullptr; 1069 } 1070 opeer_ = nullptr; 1071 1072 bool initialized = (jni_env_ != nullptr); // Did Thread::Init run? 1073 if (initialized) { 1074 delete jni_env_; 1075 jni_env_ = nullptr; 1076 } 1077 CHECK_NE(GetState(), kRunnable); 1078 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1079 CHECK(checkpoint_functions_[0] == nullptr); 1080 CHECK(checkpoint_functions_[1] == nullptr); 1081 CHECK(checkpoint_functions_[2] == nullptr); 1082 1083 // We may be deleting a still born thread. 1084 SetStateUnsafe(kTerminated); 1085 1086 delete wait_cond_; 1087 delete wait_mutex_; 1088 1089 if (long_jump_context_ != nullptr) { 1090 delete long_jump_context_; 1091 } 1092 1093 if (initialized) { 1094 CleanupCpu(); 1095 } 1096 1097 delete debug_invoke_req_; 1098 delete single_step_control_; 1099 delete instrumentation_stack_; 1100 delete name_; 1101 delete stack_trace_sample_; 1102 1103 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1104 1105 TearDownAlternateSignalStack(); 1106} 1107 1108void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1109 if (!IsExceptionPending()) { 1110 return; 1111 } 1112 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1113 ScopedThreadStateChange tsc(this, kNative); 1114 1115 // Get and clear the exception. 1116 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1117 jni_env_->ExceptionClear(); 1118 1119 // If the thread has its own handler, use that. 1120 ScopedLocalRef<jobject> handler(jni_env_, 1121 jni_env_->GetObjectField(peer.get(), 1122 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1123 if (handler.get() == nullptr) { 1124 // Otherwise use the thread group's default handler. 1125 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1126 } 1127 1128 // Call the handler. 1129 jni_env_->CallVoidMethod(handler.get(), 1130 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1131 peer.get(), exception.get()); 1132 1133 // If the handler threw, clear that exception too. 1134 jni_env_->ExceptionClear(); 1135} 1136 1137void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1138 // this.group.removeThread(this); 1139 // group can be null if we're in the compiler or a test. 1140 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1141 if (ogroup != nullptr) { 1142 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1143 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1144 ScopedThreadStateChange tsc(soa.Self(), kNative); 1145 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1146 peer.get()); 1147 } 1148} 1149 1150size_t Thread::NumSirtReferences() { 1151 size_t count = 0; 1152 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1153 count += cur->NumberOfReferences(); 1154 } 1155 return count; 1156} 1157 1158bool Thread::SirtContains(jobject obj) const { 1159 StackReference<mirror::Object>* sirt_entry = 1160 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1161 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1162 if (cur->Contains(sirt_entry)) { 1163 return true; 1164 } 1165 } 1166 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1167 return managed_stack_.ShadowFramesContain(sirt_entry); 1168} 1169 1170void Thread::SirtVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1171 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1172 size_t num_refs = cur->NumberOfReferences(); 1173 for (size_t j = 0; j < num_refs; ++j) { 1174 mirror::Object* object = cur->GetReference(j); 1175 if (object != nullptr) { 1176 mirror::Object* old_obj = object; 1177 visitor(&object, arg, thread_id, kRootNativeStack); 1178 if (old_obj != object) { 1179 cur->SetReference(j, object); 1180 } 1181 } 1182 } 1183 } 1184} 1185 1186mirror::Object* Thread::DecodeJObject(jobject obj) const { 1187 Locks::mutator_lock_->AssertSharedHeld(this); 1188 if (obj == nullptr) { 1189 return nullptr; 1190 } 1191 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1192 IndirectRefKind kind = GetIndirectRefKind(ref); 1193 mirror::Object* result; 1194 // The "kinds" below are sorted by the frequency we expect to encounter them. 1195 if (kind == kLocal) { 1196 IndirectReferenceTable& locals = jni_env_->locals; 1197 result = locals.Get(ref); 1198 } else if (kind == kSirtOrInvalid) { 1199 // TODO: make stack indirect reference table lookup more efficient. 1200 // Check if this is a local reference in the SIRT. 1201 if (LIKELY(SirtContains(obj))) { 1202 // Read from SIRT. 1203 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1204 VerifyObject(result); 1205 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1206 // Assume an invalid local reference is actually a direct pointer. 1207 result = reinterpret_cast<mirror::Object*>(obj); 1208 VerifyObject(result); 1209 } else { 1210 result = kInvalidIndirectRefObject; 1211 } 1212 } else if (kind == kGlobal) { 1213 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1214 IndirectReferenceTable& globals = vm->globals; 1215 ReaderMutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1216 result = const_cast<mirror::Object*>(globals.Get(ref)); 1217 } else { 1218 DCHECK_EQ(kind, kWeakGlobal); 1219 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1220 if (result == kClearedJniWeakGlobal) { 1221 // This is a special case where it's okay to return nullptr. 1222 return nullptr; 1223 } 1224 } 1225 1226 if (UNLIKELY(result == nullptr)) { 1227 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1228 } 1229 return result; 1230} 1231 1232// Implements java.lang.Thread.interrupted. 1233bool Thread::Interrupted() { 1234 MutexLock mu(Thread::Current(), *wait_mutex_); 1235 bool interrupted = interrupted_; 1236 interrupted_ = false; 1237 return interrupted; 1238} 1239 1240// Implements java.lang.Thread.isInterrupted. 1241bool Thread::IsInterrupted() { 1242 MutexLock mu(Thread::Current(), *wait_mutex_); 1243 return interrupted_; 1244} 1245 1246void Thread::Interrupt() { 1247 Thread* self = Thread::Current(); 1248 MutexLock mu(self, *wait_mutex_); 1249 if (interrupted_) { 1250 return; 1251 } 1252 interrupted_ = true; 1253 NotifyLocked(self); 1254} 1255 1256void Thread::Notify() { 1257 Thread* self = Thread::Current(); 1258 MutexLock mu(self, *wait_mutex_); 1259 NotifyLocked(self); 1260} 1261 1262void Thread::NotifyLocked(Thread* self) { 1263 if (wait_monitor_ != nullptr) { 1264 wait_cond_->Signal(self); 1265 } 1266} 1267 1268class CountStackDepthVisitor : public StackVisitor { 1269 public: 1270 explicit CountStackDepthVisitor(Thread* thread) 1271 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1272 : StackVisitor(thread, nullptr), 1273 depth_(0), skip_depth_(0), skipping_(true) {} 1274 1275 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1276 // We want to skip frames up to and including the exception's constructor. 1277 // Note we also skip the frame if it doesn't have a method (namely the callee 1278 // save frame) 1279 mirror::ArtMethod* m = GetMethod(); 1280 if (skipping_ && !m->IsRuntimeMethod() && 1281 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1282 skipping_ = false; 1283 } 1284 if (!skipping_) { 1285 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1286 ++depth_; 1287 } 1288 } else { 1289 ++skip_depth_; 1290 } 1291 return true; 1292 } 1293 1294 int GetDepth() const { 1295 return depth_; 1296 } 1297 1298 int GetSkipDepth() const { 1299 return skip_depth_; 1300 } 1301 1302 private: 1303 uint32_t depth_; 1304 uint32_t skip_depth_; 1305 bool skipping_; 1306}; 1307 1308class BuildInternalStackTraceVisitor : public StackVisitor { 1309 public: 1310 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1311 : StackVisitor(thread, nullptr), self_(self), 1312 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1313 1314 bool Init(int depth) 1315 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1316 // Allocate method trace with an extra slot that will hold the PC trace 1317 SirtRef<mirror::ObjectArray<mirror::Object> > 1318 method_trace(self_, 1319 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1320 depth + 1)); 1321 if (method_trace.get() == nullptr) { 1322 return false; 1323 } 1324 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1325 if (dex_pc_trace == nullptr) { 1326 return false; 1327 } 1328 // Save PC trace in last element of method trace, also places it into the 1329 // object graph. 1330 // We are called from native: use non-transactional mode. 1331 method_trace->Set<false>(depth, dex_pc_trace); 1332 // Set the Object*s and assert that no thread suspension is now possible. 1333 const char* last_no_suspend_cause = 1334 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1335 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1336 method_trace_ = method_trace.get(); 1337 dex_pc_trace_ = dex_pc_trace; 1338 return true; 1339 } 1340 1341 virtual ~BuildInternalStackTraceVisitor() { 1342 if (method_trace_ != nullptr) { 1343 self_->EndAssertNoThreadSuspension(nullptr); 1344 } 1345 } 1346 1347 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1348 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1349 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1350 } 1351 if (skip_depth_ > 0) { 1352 skip_depth_--; 1353 return true; 1354 } 1355 mirror::ArtMethod* m = GetMethod(); 1356 if (m->IsRuntimeMethod()) { 1357 return true; // Ignore runtime frames (in particular callee save). 1358 } 1359 // TODO dedup this code. 1360 if (Runtime::Current()->IsActiveTransaction()) { 1361 method_trace_->Set<true>(count_, m); 1362 dex_pc_trace_->Set<true>(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1363 } else { 1364 method_trace_->Set<false>(count_, m); 1365 dex_pc_trace_->Set<false>(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1366 } 1367 ++count_; 1368 return true; 1369 } 1370 1371 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1372 return method_trace_; 1373 } 1374 1375 private: 1376 Thread* const self_; 1377 // How many more frames to skip. 1378 int32_t skip_depth_; 1379 // Current position down stack trace. 1380 uint32_t count_; 1381 // Array of dex PC values. 1382 mirror::IntArray* dex_pc_trace_; 1383 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1384 mirror::ObjectArray<mirror::Object>* method_trace_; 1385}; 1386 1387jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1388 // Compute depth of stack 1389 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1390 count_visitor.WalkStack(); 1391 int32_t depth = count_visitor.GetDepth(); 1392 int32_t skip_depth = count_visitor.GetSkipDepth(); 1393 1394 // Build internal stack trace. 1395 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1396 skip_depth); 1397 if (!build_trace_visitor.Init(depth)) { 1398 return nullptr; // Allocation failed. 1399 } 1400 build_trace_visitor.WalkStack(); 1401 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1402 if (kIsDebugBuild) { 1403 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1404 CHECK(trace->Get(i) != nullptr); 1405 } 1406 } 1407 return soa.AddLocalReference<jobjectArray>(trace); 1408} 1409 1410jobjectArray Thread::InternalStackTraceToStackTraceElementArray(const ScopedObjectAccess& soa, 1411 jobject internal, jobjectArray output_array, int* stack_depth) { 1412 // Decode the internal stack trace into the depth, method trace and PC trace 1413 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1414 1415 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1416 1417 jobjectArray result; 1418 1419 if (output_array != nullptr) { 1420 // Reuse the array we were given. 1421 result = output_array; 1422 // ...adjusting the number of frames we'll write to not exceed the array length. 1423 const int32_t traces_length = 1424 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1425 depth = std::min(depth, traces_length); 1426 } else { 1427 // Create java_trace array and place in local reference table 1428 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1429 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1430 if (java_traces == nullptr) { 1431 return nullptr; 1432 } 1433 result = soa.AddLocalReference<jobjectArray>(java_traces); 1434 } 1435 1436 if (stack_depth != nullptr) { 1437 *stack_depth = depth; 1438 } 1439 1440 for (int32_t i = 0; i < depth; ++i) { 1441 mirror::ObjectArray<mirror::Object>* method_trace = 1442 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1443 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1444 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1445 MethodHelper mh(method); 1446 int32_t line_number; 1447 SirtRef<mirror::String> class_name_object(soa.Self(), nullptr); 1448 SirtRef<mirror::String> source_name_object(soa.Self(), nullptr); 1449 if (method->IsProxyMethod()) { 1450 line_number = -1; 1451 class_name_object.reset(method->GetDeclaringClass()->GetName()); 1452 // source_name_object intentionally left null for proxy methods 1453 } else { 1454 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1455 uint32_t dex_pc = pc_trace->Get(i); 1456 line_number = mh.GetLineNumFromDexPC(dex_pc); 1457 // Allocate element, potentially triggering GC 1458 // TODO: reuse class_name_object via Class::name_? 1459 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1460 CHECK(descriptor != nullptr); 1461 std::string class_name(PrettyDescriptor(descriptor)); 1462 class_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1463 if (class_name_object.get() == nullptr) { 1464 return nullptr; 1465 } 1466 const char* source_file = mh.GetDeclaringClassSourceFile(); 1467 if (source_file != nullptr) { 1468 source_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1469 if (source_name_object.get() == nullptr) { 1470 return nullptr; 1471 } 1472 } 1473 } 1474 const char* method_name = mh.GetName(); 1475 CHECK(method_name != nullptr); 1476 SirtRef<mirror::String> method_name_object(soa.Self(), 1477 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1478 method_name)); 1479 if (method_name_object.get() == nullptr) { 1480 return nullptr; 1481 } 1482 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1483 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1484 if (obj == nullptr) { 1485 return nullptr; 1486 } 1487 // We are called from native: use non-transactional mode. 1488 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1489 } 1490 return result; 1491} 1492 1493void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1494 const char* exception_class_descriptor, const char* fmt, ...) { 1495 va_list args; 1496 va_start(args, fmt); 1497 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1498 fmt, args); 1499 va_end(args); 1500} 1501 1502void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1503 const char* exception_class_descriptor, 1504 const char* fmt, va_list ap) { 1505 std::string msg; 1506 StringAppendV(&msg, fmt, ap); 1507 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1508} 1509 1510void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1511 const char* msg) { 1512 // Callers should either clear or call ThrowNewWrappedException. 1513 AssertNoPendingExceptionForNewException(msg); 1514 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1515} 1516 1517void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1518 const char* exception_class_descriptor, 1519 const char* msg) { 1520 DCHECK_EQ(this, Thread::Current()); 1521 ScopedObjectAccessUnchecked soa(this); 1522 // Ensure we don't forget arguments over object allocation. 1523 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1524 SirtRef<mirror::ArtMethod> saved_throw_method(this, throw_location.GetMethod()); 1525 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1526 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1527 ClearException(); 1528 Runtime* runtime = Runtime::Current(); 1529 1530 mirror::ClassLoader* cl = nullptr; 1531 if (saved_throw_method.get() != nullptr) { 1532 cl = saved_throw_method.get()->GetDeclaringClass()->GetClassLoader(); 1533 } 1534 SirtRef<mirror::ClassLoader> class_loader(this, cl); 1535 SirtRef<mirror::Class> 1536 exception_class(this, runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1537 class_loader)); 1538 if (UNLIKELY(exception_class.get() == nullptr)) { 1539 CHECK(IsExceptionPending()); 1540 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1541 return; 1542 } 1543 1544 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1545 DCHECK(IsExceptionPending()); 1546 return; 1547 } 1548 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1549 SirtRef<mirror::Throwable> exception(this, 1550 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1551 1552 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1553 if (exception.get() == nullptr) { 1554 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1555 throw_location.GetDexPc()); 1556 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1557 return; 1558 } 1559 1560 // Choose an appropriate constructor and set up the arguments. 1561 const char* signature; 1562 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1563 if (msg != nullptr) { 1564 // Ensure we remember this and the method over the String allocation. 1565 msg_string.reset( 1566 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1567 if (UNLIKELY(msg_string.get() == nullptr)) { 1568 CHECK(IsExceptionPending()); // OOME. 1569 return; 1570 } 1571 if (cause.get() == nullptr) { 1572 signature = "(Ljava/lang/String;)V"; 1573 } else { 1574 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1575 } 1576 } else { 1577 if (cause.get() == nullptr) { 1578 signature = "()V"; 1579 } else { 1580 signature = "(Ljava/lang/Throwable;)V"; 1581 } 1582 } 1583 mirror::ArtMethod* exception_init_method = 1584 exception_class->FindDeclaredDirectMethod("<init>", signature); 1585 1586 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1587 << PrettyDescriptor(exception_class_descriptor); 1588 1589 if (UNLIKELY(!runtime->IsStarted())) { 1590 // Something is trying to throw an exception without a started runtime, which is the common 1591 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1592 // the exception fields directly. 1593 if (msg != nullptr) { 1594 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1595 } 1596 if (cause.get() != nullptr) { 1597 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1598 } 1599 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1600 throw_location.GetDexPc()); 1601 SetException(gc_safe_throw_location, exception.get()); 1602 } else { 1603 jvalue jv_args[2]; 1604 size_t i = 0; 1605 1606 if (msg != nullptr) { 1607 jv_args[i].l = msg_string.get(); 1608 ++i; 1609 } 1610 if (cause.get() != nullptr) { 1611 jv_args[i].l = cause.get(); 1612 ++i; 1613 } 1614 InvokeWithJValues(soa, exception.get(), soa.EncodeMethod(exception_init_method), jv_args); 1615 if (LIKELY(!IsExceptionPending())) { 1616 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1617 throw_location.GetDexPc()); 1618 SetException(gc_safe_throw_location, exception.get()); 1619 } 1620 } 1621} 1622 1623void Thread::ThrowOutOfMemoryError(const char* msg) { 1624 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1625 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1626 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1627 if (!throwing_OutOfMemoryError_) { 1628 throwing_OutOfMemoryError_ = true; 1629 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1630 throwing_OutOfMemoryError_ = false; 1631 } else { 1632 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1633 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1634 } 1635} 1636 1637Thread* Thread::CurrentFromGdb() { 1638 return Thread::Current(); 1639} 1640 1641void Thread::DumpFromGdb() const { 1642 std::ostringstream ss; 1643 Dump(ss); 1644 std::string str(ss.str()); 1645 // log to stderr for debugging command line processes 1646 std::cerr << str; 1647#ifdef HAVE_ANDROID_OS 1648 // log to logcat for debugging frameworks processes 1649 LOG(INFO) << str; 1650#endif 1651} 1652 1653struct EntryPointInfo { 1654 uint32_t offset; 1655 const char* name; 1656}; 1657#define INTERPRETER_ENTRY_POINT_INFO(x) { INTERPRETER_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1658#define JNI_ENTRY_POINT_INFO(x) { JNI_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1659#define PORTABLE_ENTRY_POINT_INFO(x) { PORTABLE_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1660#define QUICK_ENTRY_POINT_INFO(x) { QUICK_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1661static const EntryPointInfo gThreadEntryPointInfo[] = { 1662 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge), 1663 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge), 1664 JNI_ENTRY_POINT_INFO(pDlsymLookup), 1665 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline), 1666 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline), 1667 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge), 1668 QUICK_ENTRY_POINT_INFO(pAllocArray), 1669 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved), 1670 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck), 1671 QUICK_ENTRY_POINT_INFO(pAllocObject), 1672 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved), 1673 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized), 1674 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck), 1675 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray), 1676 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck), 1677 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial), 1678 QUICK_ENTRY_POINT_INFO(pCheckCast), 1679 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage), 1680 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess), 1681 QUICK_ENTRY_POINT_INFO(pInitializeType), 1682 QUICK_ENTRY_POINT_INFO(pResolveString), 1683 QUICK_ENTRY_POINT_INFO(pSet32Instance), 1684 QUICK_ENTRY_POINT_INFO(pSet32Static), 1685 QUICK_ENTRY_POINT_INFO(pSet64Instance), 1686 QUICK_ENTRY_POINT_INFO(pSet64Static), 1687 QUICK_ENTRY_POINT_INFO(pSetObjInstance), 1688 QUICK_ENTRY_POINT_INFO(pSetObjStatic), 1689 QUICK_ENTRY_POINT_INFO(pGet32Instance), 1690 QUICK_ENTRY_POINT_INFO(pGet32Static), 1691 QUICK_ENTRY_POINT_INFO(pGet64Instance), 1692 QUICK_ENTRY_POINT_INFO(pGet64Static), 1693 QUICK_ENTRY_POINT_INFO(pGetObjInstance), 1694 QUICK_ENTRY_POINT_INFO(pGetObjStatic), 1695 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck), 1696 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck), 1697 QUICK_ENTRY_POINT_INFO(pAputObject), 1698 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData), 1699 QUICK_ENTRY_POINT_INFO(pJniMethodStart), 1700 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1701 QUICK_ENTRY_POINT_INFO(pJniMethodEnd), 1702 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1703 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference), 1704 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1705 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline), 1706 QUICK_ENTRY_POINT_INFO(pLockObject), 1707 QUICK_ENTRY_POINT_INFO(pUnlockObject), 1708 QUICK_ENTRY_POINT_INFO(pCmpgDouble), 1709 QUICK_ENTRY_POINT_INFO(pCmpgFloat), 1710 QUICK_ENTRY_POINT_INFO(pCmplDouble), 1711 QUICK_ENTRY_POINT_INFO(pCmplFloat), 1712 QUICK_ENTRY_POINT_INFO(pFmod), 1713 QUICK_ENTRY_POINT_INFO(pSqrt), 1714 QUICK_ENTRY_POINT_INFO(pL2d), 1715 QUICK_ENTRY_POINT_INFO(pFmodf), 1716 QUICK_ENTRY_POINT_INFO(pL2f), 1717 QUICK_ENTRY_POINT_INFO(pD2iz), 1718 QUICK_ENTRY_POINT_INFO(pF2iz), 1719 QUICK_ENTRY_POINT_INFO(pIdivmod), 1720 QUICK_ENTRY_POINT_INFO(pD2l), 1721 QUICK_ENTRY_POINT_INFO(pF2l), 1722 QUICK_ENTRY_POINT_INFO(pLdiv), 1723 QUICK_ENTRY_POINT_INFO(pLmod), 1724 QUICK_ENTRY_POINT_INFO(pLmul), 1725 QUICK_ENTRY_POINT_INFO(pShlLong), 1726 QUICK_ENTRY_POINT_INFO(pShrLong), 1727 QUICK_ENTRY_POINT_INFO(pUshrLong), 1728 QUICK_ENTRY_POINT_INFO(pIndexOf), 1729 QUICK_ENTRY_POINT_INFO(pMemcmp16), 1730 QUICK_ENTRY_POINT_INFO(pStringCompareTo), 1731 QUICK_ENTRY_POINT_INFO(pMemcpy), 1732 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline), 1733 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline), 1734 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge), 1735 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1736 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1737 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1738 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1739 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1740 QUICK_ENTRY_POINT_INFO(pCheckSuspend), 1741 QUICK_ENTRY_POINT_INFO(pTestSuspend), 1742 QUICK_ENTRY_POINT_INFO(pDeliverException), 1743 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds), 1744 QUICK_ENTRY_POINT_INFO(pThrowDivZero), 1745 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod), 1746 QUICK_ENTRY_POINT_INFO(pThrowNullPointer), 1747 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow), 1748}; 1749#undef QUICK_ENTRY_POINT_INFO 1750 1751void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1752 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1753 1754#define DO_THREAD_OFFSET(x) \ 1755 if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { \ 1756 os << # x; \ 1757 return; \ 1758 } 1759 DO_THREAD_OFFSET(state_and_flags_); 1760 DO_THREAD_OFFSET(card_table_); 1761 DO_THREAD_OFFSET(exception_); 1762 DO_THREAD_OFFSET(opeer_); 1763 DO_THREAD_OFFSET(jni_env_); 1764 DO_THREAD_OFFSET(self_); 1765 DO_THREAD_OFFSET(stack_end_); 1766 DO_THREAD_OFFSET(suspend_count_); 1767 DO_THREAD_OFFSET(thin_lock_thread_id_); 1768 // DO_THREAD_OFFSET(top_of_managed_stack_); 1769 // DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1770 DO_THREAD_OFFSET(top_sirt_); 1771 DO_THREAD_OFFSET(suspend_trigger_); 1772#undef DO_THREAD_OFFSET 1773 1774 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1775 CHECK_EQ(entry_point_count * size_of_pointers, 1776 sizeof(InterpreterEntryPoints) + sizeof(JniEntryPoints) + sizeof(PortableEntryPoints) + 1777 sizeof(QuickEntryPoints)); 1778 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, interpreter_entrypoints_); 1779 for (size_t i = 0; i < entry_point_count; ++i) { 1780 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1781 expected_offset += size_of_pointers; 1782 if (gThreadEntryPointInfo[i].offset == offset) { 1783 os << gThreadEntryPointInfo[i].name; 1784 return; 1785 } 1786 } 1787 os << offset; 1788} 1789 1790void Thread::QuickDeliverException() { 1791 // Get exception from thread. 1792 ThrowLocation throw_location; 1793 mirror::Throwable* exception = GetException(&throw_location); 1794 CHECK(exception != nullptr); 1795 // Don't leave exception visible while we try to find the handler, which may cause class 1796 // resolution. 1797 ClearException(); 1798 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1799 if (kDebugExceptionDelivery) { 1800 if (!is_deoptimization) { 1801 mirror::String* msg = exception->GetDetailMessage(); 1802 std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : ""); 1803 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1804 << ": " << str_msg << "\n"); 1805 } else { 1806 DumpStack(LOG(INFO) << "Deoptimizing: "); 1807 } 1808 } 1809 CatchFinder catch_finder(this, throw_location, exception, is_deoptimization); 1810 catch_finder.FindCatch(); 1811 catch_finder.UpdateInstrumentationStack(); 1812 catch_finder.DoLongJump(); 1813 LOG(FATAL) << "UNREACHABLE"; 1814} 1815 1816Context* Thread::GetLongJumpContext() { 1817 Context* result = long_jump_context_; 1818 if (result == nullptr) { 1819 result = Context::Create(); 1820 } else { 1821 long_jump_context_ = nullptr; // Avoid context being shared. 1822 result->Reset(); 1823 } 1824 return result; 1825} 1826 1827struct CurrentMethodVisitor FINAL : public StackVisitor { 1828 CurrentMethodVisitor(Thread* thread, Context* context) 1829 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1830 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1831 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1832 mirror::ArtMethod* m = GetMethod(); 1833 if (m->IsRuntimeMethod()) { 1834 // Continue if this is a runtime method. 1835 return true; 1836 } 1837 if (context_ != nullptr) { 1838 this_object_ = GetThisObject(); 1839 } 1840 method_ = m; 1841 dex_pc_ = GetDexPc(); 1842 return false; 1843 } 1844 mirror::Object* this_object_; 1845 mirror::ArtMethod* method_; 1846 uint32_t dex_pc_; 1847}; 1848 1849mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1850 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1851 visitor.WalkStack(false); 1852 if (dex_pc != nullptr) { 1853 *dex_pc = visitor.dex_pc_; 1854 } 1855 return visitor.method_; 1856} 1857 1858ThrowLocation Thread::GetCurrentLocationForThrow() { 1859 Context* context = GetLongJumpContext(); 1860 CurrentMethodVisitor visitor(this, context); 1861 visitor.WalkStack(false); 1862 ReleaseLongJumpContext(context); 1863 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1864} 1865 1866bool Thread::HoldsLock(mirror::Object* object) { 1867 if (object == nullptr) { 1868 return false; 1869 } 1870 return object->GetLockOwnerThreadId() == thin_lock_thread_id_; 1871} 1872 1873// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1874template <typename RootVisitor> 1875class ReferenceMapVisitor : public StackVisitor { 1876 public: 1877 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1878 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1879 : StackVisitor(thread, context), visitor_(visitor) {} 1880 1881 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1882 if (false) { 1883 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1884 << StringPrintf("@ PC:%04x", GetDexPc()); 1885 } 1886 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1887 if (shadow_frame != nullptr) { 1888 mirror::ArtMethod* m = shadow_frame->GetMethod(); 1889 size_t num_regs = shadow_frame->NumberOfVRegs(); 1890 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1891 // SIRT for JNI or References for interpreter. 1892 for (size_t reg = 0; reg < num_regs; ++reg) { 1893 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1894 if (ref != nullptr) { 1895 mirror::Object* new_ref = ref; 1896 visitor_(&new_ref, reg, this); 1897 if (new_ref != ref) { 1898 shadow_frame->SetVRegReference(reg, new_ref); 1899 } 1900 } 1901 } 1902 } else { 1903 // Java method. 1904 // Portable path use DexGcMap and store in Method.native_gc_map_. 1905 const uint8_t* gc_map = m->GetNativeGcMap(); 1906 CHECK(gc_map != nullptr) << PrettyMethod(m); 1907 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 1908 uint32_t dex_pc = GetDexPc(); 1909 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 1910 DCHECK(reg_bitmap != nullptr); 1911 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 1912 for (size_t reg = 0; reg < num_regs; ++reg) { 1913 if (TestBitmap(reg, reg_bitmap)) { 1914 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1915 if (ref != nullptr) { 1916 mirror::Object* new_ref = ref; 1917 visitor_(&new_ref, reg, this); 1918 if (new_ref != ref) { 1919 shadow_frame->SetVRegReference(reg, new_ref); 1920 } 1921 } 1922 } 1923 } 1924 } 1925 } else { 1926 mirror::ArtMethod* m = GetMethod(); 1927 // Process register map (which native and runtime methods don't have) 1928 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 1929 const uint8_t* native_gc_map = m->GetNativeGcMap(); 1930 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 1931 mh_.ChangeMethod(m); 1932 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 1933 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 1934 NativePcOffsetToReferenceMap map(native_gc_map); 1935 size_t num_regs = std::min(map.RegWidth() * 8, 1936 static_cast<size_t>(code_item->registers_size_)); 1937 if (num_regs > 0) { 1938 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 1939 DCHECK(reg_bitmap != nullptr); 1940 const VmapTable vmap_table(m->GetVmapTable()); 1941 uint32_t core_spills = m->GetCoreSpillMask(); 1942 uint32_t fp_spills = m->GetFpSpillMask(); 1943 size_t frame_size = m->GetFrameSizeInBytes(); 1944 // For all dex registers in the bitmap 1945 mirror::ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 1946 DCHECK(cur_quick_frame != nullptr); 1947 for (size_t reg = 0; reg < num_regs; ++reg) { 1948 // Does this register hold a reference? 1949 if (TestBitmap(reg, reg_bitmap)) { 1950 uint32_t vmap_offset; 1951 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 1952 int vmap_reg = vmap_table.ComputeRegister(core_spills, vmap_offset, kReferenceVReg); 1953 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 1954 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 1955 if (*ref_addr != nullptr) { 1956 visitor_(ref_addr, reg, this); 1957 } 1958 } else { 1959 StackReference<mirror::Object>* ref_addr = 1960 reinterpret_cast<StackReference<mirror::Object>*>( 1961 GetVRegAddr(cur_quick_frame, code_item, core_spills, fp_spills, frame_size, 1962 reg)); 1963 mirror::Object* ref = ref_addr->AsMirrorPtr(); 1964 if (ref != nullptr) { 1965 mirror::Object* new_ref = ref; 1966 visitor_(&new_ref, reg, this); 1967 if (ref != new_ref) { 1968 ref_addr->Assign(new_ref); 1969 } 1970 } 1971 } 1972 } 1973 } 1974 } 1975 } 1976 } 1977 return true; 1978 } 1979 1980 private: 1981 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 1982 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 1983 } 1984 1985 // Visitor for when we visit a root. 1986 const RootVisitor& visitor_; 1987 1988 // A method helper we keep around to avoid dex file/cache re-computations. 1989 MethodHelper mh_; 1990}; 1991 1992class RootCallbackVisitor { 1993 public: 1994 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 1995 : callback_(callback), arg_(arg), tid_(tid) {} 1996 1997 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 1998 callback_(obj, arg_, tid_, kRootJavaFrame); 1999 } 2000 2001 private: 2002 RootCallback* const callback_; 2003 void* const arg_; 2004 const uint32_t tid_; 2005}; 2006 2007void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2008 VerifyObject(class_loader_override); 2009 class_loader_override_ = class_loader_override; 2010} 2011 2012void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2013 uint32_t thread_id = GetThreadId(); 2014 if (opeer_ != nullptr) { 2015 visitor(&opeer_, arg, thread_id, kRootThreadObject); 2016 } 2017 if (exception_ != nullptr) { 2018 visitor(reinterpret_cast<mirror::Object**>(&exception_), arg, thread_id, kRootNativeStack); 2019 } 2020 throw_location_.VisitRoots(visitor, arg); 2021 if (class_loader_override_ != nullptr) { 2022 visitor(reinterpret_cast<mirror::Object**>(&class_loader_override_), arg, thread_id, 2023 kRootNativeStack); 2024 } 2025 jni_env_->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2026 jni_env_->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2027 SirtVisitRoots(visitor, arg, thread_id); 2028 if (debug_invoke_req_ != nullptr) { 2029 debug_invoke_req_->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2030 } 2031 if (single_step_control_ != nullptr) { 2032 single_step_control_->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2033 } 2034 // Visit roots on this thread's stack 2035 Context* context = GetLongJumpContext(); 2036 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2037 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2038 mapper.WalkStack(); 2039 ReleaseLongJumpContext(context); 2040 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2041 if (frame.this_object_ != nullptr) { 2042 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2043 } 2044 DCHECK(frame.method_ != nullptr); 2045 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2046 } 2047} 2048 2049static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2050 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2051 VerifyObject(*root); 2052} 2053 2054void Thread::VerifyStackImpl() { 2055 UniquePtr<Context> context(Context::Create()); 2056 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2057 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2058 mapper.WalkStack(); 2059} 2060 2061// Set the stack end to that to be used during a stack overflow 2062void Thread::SetStackEndForStackOverflow() { 2063 // During stack overflow we allow use of the full stack. 2064 if (stack_end_ == stack_begin_) { 2065 // However, we seem to have already extended to use the full stack. 2066 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2067 << kStackOverflowReservedBytes << ")?"; 2068 DumpStack(LOG(ERROR)); 2069 LOG(FATAL) << "Recursive stack overflow."; 2070 } 2071 2072 stack_end_ = stack_begin_; 2073} 2074 2075void Thread::SetTlab(byte* start, byte* end) { 2076 DCHECK_LE(start, end); 2077 thread_local_start_ = start; 2078 thread_local_pos_ = thread_local_start_; 2079 thread_local_end_ = end; 2080 thread_local_objects_ = 0; 2081} 2082 2083bool Thread::HasTlab() const { 2084 bool has_tlab = thread_local_pos_ != nullptr; 2085 if (has_tlab) { 2086 DCHECK(thread_local_start_ != nullptr && thread_local_end_ != nullptr); 2087 } else { 2088 DCHECK(thread_local_start_ == nullptr && thread_local_end_ == nullptr); 2089 } 2090 return has_tlab; 2091} 2092 2093std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2094 thread.ShortDump(os); 2095 return os; 2096} 2097 2098} // namespace art 2099