thread.cc revision b373e091eac39b1a79c11f2dcbd610af01e9e8a9
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 "invoke_arg_array_builder.h" 49#include "jni_internal.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class-inl.h" 53#include "mirror/class_loader.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/stack_trace_element.h" 56#include "monitor.h" 57#include "object_utils.h" 58#include "reflection.h" 59#include "runtime.h" 60#include "scoped_thread_state_change.h" 61#include "ScopedLocalRef.h" 62#include "ScopedUtfChars.h" 63#include "sirt_ref.h" 64#include "stack.h" 65#include "stack_indirect_reference_table.h" 66#include "thread-inl.h" 67#include "thread_list.h" 68#include "utils.h" 69#include "verifier/dex_gc_map.h" 70#include "verify_object-inl.h" 71#include "vmap_table.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76bool Thread::is_started_ = false; 77pthread_key_t Thread::pthread_key_self_; 78ConditionVariable* Thread::resume_cond_ = nullptr; 79 80static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 81 82void Thread::InitCardTable() { 83 card_table_ = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 84} 85 86#if !defined(__APPLE__) 87static void UnimplementedEntryPoint() { 88 UNIMPLEMENTED(FATAL); 89} 90#endif 91 92void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 93 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 94 95void Thread::InitTlsEntryPoints() { 96#if !defined(__APPLE__) // The Mac GCC is too old to accept this code. 97 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 98 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 99 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(quick_entrypoints_)); 100 for (uintptr_t* it = begin; it != end; ++it) { 101 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 102 } 103 begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 104 end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(portable_entrypoints_)); 105 for (uintptr_t* it = begin; it != end; ++it) { 106 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 107 } 108#endif 109 InitEntryPoints(&interpreter_entrypoints_, &jni_entrypoints_, &portable_entrypoints_, 110 &quick_entrypoints_); 111} 112 113void Thread::ResetQuickAllocEntryPointsForThread() { 114 ResetQuickAllocEntryPoints(&quick_entrypoints_); 115} 116 117void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 118 deoptimization_shadow_frame_ = sf; 119} 120 121void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 122 deoptimization_return_value_.SetJ(ret_val.GetJ()); 123} 124 125ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 126 ShadowFrame* sf = deoptimization_shadow_frame_; 127 deoptimization_shadow_frame_ = nullptr; 128 ret_val->SetJ(deoptimization_return_value_.GetJ()); 129 return sf; 130} 131 132void Thread::InitTid() { 133 tid_ = ::art::GetTid(); 134} 135 136void Thread::InitAfterFork() { 137 // One thread (us) survived the fork, but we have a new tid so we need to 138 // update the value stashed in this Thread*. 139 InitTid(); 140} 141 142void* Thread::CreateCallback(void* arg) { 143 Thread* self = reinterpret_cast<Thread*>(arg); 144 Runtime* runtime = Runtime::Current(); 145 if (runtime == nullptr) { 146 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 147 return nullptr; 148 } 149 { 150 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 151 // after self->Init(). 152 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 153 // Check that if we got here we cannot be shutting down (as shutdown should never have started 154 // while threads are being born). 155 CHECK(!runtime->IsShuttingDownLocked()); 156 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 157 Runtime::Current()->EndThreadBirth(); 158 } 159 { 160 ScopedObjectAccess soa(self); 161 162 // Copy peer into self, deleting global reference when done. 163 CHECK(self->jpeer_ != nullptr); 164 self->opeer_ = soa.Decode<mirror::Object*>(self->jpeer_); 165 self->GetJniEnv()->DeleteGlobalRef(self->jpeer_); 166 self->jpeer_ = nullptr; 167 168 { 169 SirtRef<mirror::String> thread_name(self, self->GetThreadName(soa)); 170 self->SetThreadName(thread_name->ToModifiedUtf8().c_str()); 171 } 172 Dbg::PostThreadStart(self); 173 174 // Invoke the 'run' method of our java.lang.Thread. 175 mirror::Object* receiver = self->opeer_; 176 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 177 mirror::ArtMethod* m = 178 receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(soa.DecodeMethod(mid)); 179 JValue result; 180 ArgArray arg_array(nullptr, 0); 181 arg_array.Append(receiver); 182 m->Invoke(self, arg_array.GetArray(), arg_array.GetNumBytes(), &result, "V"); 183 } 184 // Detach and delete self. 185 Runtime::Current()->GetThreadList()->Unregister(self); 186 187 return nullptr; 188} 189 190Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, 191 mirror::Object* thread_peer) { 192 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 193 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 194 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 195 // to stop it from going away. 196 if (kIsDebugBuild) { 197 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 198 if (result != nullptr && !result->IsSuspended()) { 199 Locks::thread_list_lock_->AssertHeld(soa.Self()); 200 } 201 } 202 return result; 203} 204 205Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, jobject java_thread) { 206 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 207} 208 209static size_t FixStackSize(size_t stack_size) { 210 // A stack size of zero means "use the default". 211 if (stack_size == 0) { 212 stack_size = Runtime::Current()->GetDefaultStackSize(); 213 } 214 215 // Dalvik used the bionic pthread default stack size for native threads, 216 // so include that here to support apps that expect large native stacks. 217 stack_size += 1 * MB; 218 219 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 220 if (stack_size < PTHREAD_STACK_MIN) { 221 stack_size = PTHREAD_STACK_MIN; 222 } 223 224 // It's likely that callers are trying to ensure they have at least a certain amount of 225 // stack space, so we should add our reserved space on top of what they requested, rather 226 // than implicitly take it away from them. 227 stack_size += Thread::kStackOverflowReservedBytes; 228 229 // Some systems require the stack size to be a multiple of the system page size, so round up. 230 stack_size = RoundUp(stack_size, kPageSize); 231 232 return stack_size; 233} 234 235void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 236 CHECK(java_peer != nullptr); 237 Thread* self = static_cast<JNIEnvExt*>(env)->self; 238 Runtime* runtime = Runtime::Current(); 239 240 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 241 bool thread_start_during_shutdown = false; 242 { 243 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 244 if (runtime->IsShuttingDownLocked()) { 245 thread_start_during_shutdown = true; 246 } else { 247 runtime->StartThreadBirth(); 248 } 249 } 250 if (thread_start_during_shutdown) { 251 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 252 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 253 return; 254 } 255 256 Thread* child_thread = new Thread(is_daemon); 257 // Use global JNI ref to hold peer live while child thread starts. 258 child_thread->jpeer_ = env->NewGlobalRef(java_peer); 259 stack_size = FixStackSize(stack_size); 260 261 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 262 // assign it. 263 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 264 reinterpret_cast<jlong>(child_thread)); 265 266 pthread_t new_pthread; 267 pthread_attr_t attr; 268 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 269 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 270 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 271 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 272 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 273 274 if (pthread_create_result != 0) { 275 // pthread_create(3) failed, so clean up. 276 { 277 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 278 runtime->EndThreadBirth(); 279 } 280 // Manually delete the global reference since Thread::Init will not have been run. 281 env->DeleteGlobalRef(child_thread->jpeer_); 282 child_thread->jpeer_ = nullptr; 283 delete child_thread; 284 child_thread = nullptr; 285 // TODO: remove from thread group? 286 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 287 { 288 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 289 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 290 ScopedObjectAccess soa(env); 291 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 292 } 293 } 294} 295 296void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 297 // This function does all the initialization that must be run by the native thread it applies to. 298 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 299 // we can handshake with the corresponding native thread when it's ready.) Check this native 300 // thread hasn't been through here already... 301 CHECK(Thread::Current() == nullptr); 302 SetUpAlternateSignalStack(); 303 InitCpu(); 304 InitTlsEntryPoints(); 305 RemoveSuspendTrigger(); 306 InitCardTable(); 307 InitTid(); 308 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 309 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 310 pthread_self_ = pthread_self(); 311 CHECK(is_started_); 312 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 313 DCHECK_EQ(Thread::Current(), this); 314 315 thin_lock_thread_id_ = thread_list->AllocThreadId(this); 316 InitStackHwm(); 317 318 jni_env_ = new JNIEnvExt(this, java_vm); 319 thread_list->Register(this); 320} 321 322Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 323 bool create_peer) { 324 Thread* self; 325 Runtime* runtime = Runtime::Current(); 326 if (runtime == nullptr) { 327 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 328 return nullptr; 329 } 330 { 331 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 332 if (runtime->IsShuttingDownLocked()) { 333 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 334 return nullptr; 335 } else { 336 Runtime::Current()->StartThreadBirth(); 337 self = new Thread(as_daemon); 338 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 339 Runtime::Current()->EndThreadBirth(); 340 } 341 } 342 343 CHECK_NE(self->GetState(), kRunnable); 344 self->SetState(kNative); 345 346 // If we're the main thread, ClassLinker won't be created until after we're attached, 347 // so that thread needs a two-stage attach. Regular threads don't need this hack. 348 // In the compiler, all threads need this hack, because no-one's going to be getting 349 // a native peer! 350 if (create_peer) { 351 self->CreatePeer(thread_name, as_daemon, thread_group); 352 } else { 353 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 354 if (thread_name != nullptr) { 355 self->name_->assign(thread_name); 356 ::art::SetThreadName(thread_name); 357 } 358 } 359 360 return self; 361} 362 363void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 364 Runtime* runtime = Runtime::Current(); 365 CHECK(runtime->IsStarted()); 366 JNIEnv* env = jni_env_; 367 368 if (thread_group == nullptr) { 369 thread_group = runtime->GetMainThreadGroup(); 370 } 371 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 372 jint thread_priority = GetNativePriority(); 373 jboolean thread_is_daemon = as_daemon; 374 375 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 376 if (peer.get() == nullptr) { 377 CHECK(IsExceptionPending()); 378 return; 379 } 380 { 381 ScopedObjectAccess soa(this); 382 opeer_ = soa.Decode<mirror::Object*>(peer.get()); 383 } 384 env->CallNonvirtualVoidMethod(peer.get(), 385 WellKnownClasses::java_lang_Thread, 386 WellKnownClasses::java_lang_Thread_init, 387 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 388 AssertNoPendingException(); 389 390 Thread* self = this; 391 DCHECK_EQ(self, Thread::Current()); 392 jni_env_->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 393 reinterpret_cast<jlong>(self)); 394 395 ScopedObjectAccess soa(self); 396 SirtRef<mirror::String> peer_thread_name(soa.Self(), GetThreadName(soa)); 397 if (peer_thread_name.get() == nullptr) { 398 // The Thread constructor should have set the Thread.name to a 399 // non-null value. However, because we can run without code 400 // available (in the compiler, in tests), we manually assign the 401 // fields the constructor should have set. 402 if (runtime->IsActiveTransaction()) { 403 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 404 } else { 405 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 406 } 407 peer_thread_name.reset(GetThreadName(soa)); 408 } 409 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 410 if (peer_thread_name.get() != nullptr) { 411 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 412 } 413} 414 415template<bool kTransactionActive> 416void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 417 jobject thread_name, jint thread_priority) { 418 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 419 SetBoolean<kTransactionActive>(opeer_, thread_is_daemon); 420 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 421 SetObject<kTransactionActive>(opeer_, soa.Decode<mirror::Object*>(thread_group)); 422 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 423 SetObject<kTransactionActive>(opeer_, soa.Decode<mirror::Object*>(thread_name)); 424 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 425 SetInt<kTransactionActive>(opeer_, thread_priority); 426} 427 428void Thread::SetThreadName(const char* name) { 429 name_->assign(name); 430 ::art::SetThreadName(name); 431 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 432} 433 434void Thread::InitStackHwm() { 435 void* stack_base; 436 size_t stack_size; 437 GetThreadStack(pthread_self_, &stack_base, &stack_size); 438 439 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 440 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", stack_base, PrettySize(stack_size).c_str()); 441 442 stack_begin_ = reinterpret_cast<byte*>(stack_base); 443 stack_size_ = stack_size; 444 445 if (stack_size_ <= kStackOverflowReservedBytes) { 446 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << stack_size_ << " bytes)"; 447 } 448 449 // TODO: move this into the Linux GetThreadStack implementation. 450#if !defined(__APPLE__) 451 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 452 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 453 // will be broken because we'll die long before we get close to 2GB. 454 bool is_main_thread = (::art::GetTid() == getpid()); 455 if (is_main_thread) { 456 rlimit stack_limit; 457 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 458 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 459 } 460 if (stack_limit.rlim_cur == RLIM_INFINITY) { 461 // Find the default stack size for new threads... 462 pthread_attr_t default_attributes; 463 size_t default_stack_size; 464 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 465 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 466 "default stack size query"); 467 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 468 469 // ...and use that as our limit. 470 size_t old_stack_size = stack_size_; 471 stack_size_ = default_stack_size; 472 stack_begin_ += (old_stack_size - stack_size_); 473 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 474 << " to " << PrettySize(stack_size_) 475 << " with base " << reinterpret_cast<void*>(stack_begin_); 476 } 477 } 478#endif 479 480 // Set stack_end_ to the bottom of the stack saving space of stack overflows 481 ResetDefaultStackEnd(); 482 483 // Sanity check. 484 int stack_variable; 485 CHECK_GT(&stack_variable, reinterpret_cast<void*>(stack_end_)); 486} 487 488void Thread::ShortDump(std::ostream& os) const { 489 os << "Thread["; 490 if (GetThreadId() != 0) { 491 // If we're in kStarting, we won't have a thin lock id or tid yet. 492 os << GetThreadId() 493 << ",tid=" << GetTid() << ','; 494 } 495 os << GetState() 496 << ",Thread*=" << this 497 << ",peer=" << opeer_ 498 << ",\"" << *name_ << "\"" 499 << "]"; 500} 501 502void Thread::Dump(std::ostream& os) const { 503 DumpState(os); 504 DumpStack(os); 505} 506 507mirror::String* Thread::GetThreadName(const ScopedObjectAccessUnchecked& soa) const { 508 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 509 return (opeer_ != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(opeer_)) : nullptr; 510} 511 512void Thread::GetThreadName(std::string& name) const { 513 name.assign(*name_); 514} 515 516uint64_t Thread::GetCpuMicroTime() const { 517#if defined(HAVE_POSIX_CLOCKS) 518 clockid_t cpu_clock_id; 519 pthread_getcpuclockid(pthread_self_, &cpu_clock_id); 520 timespec now; 521 clock_gettime(cpu_clock_id, &now); 522 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 523#else 524 UNIMPLEMENTED(WARNING); 525 return -1; 526#endif 527} 528 529void Thread::AtomicSetFlag(ThreadFlag flag) { 530 android_atomic_or(flag, &state_and_flags_.as_int); 531} 532 533void Thread::AtomicClearFlag(ThreadFlag flag) { 534 android_atomic_and(-1 ^ flag, &state_and_flags_.as_int); 535} 536 537// Attempt to rectify locks so that we dump thread list with required locks before exiting. 538static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 539 LOG(ERROR) << *thread << " suspend count already zero."; 540 Locks::thread_suspend_count_lock_->Unlock(self); 541 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 542 Locks::mutator_lock_->SharedTryLock(self); 543 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 544 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 545 } 546 } 547 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 548 Locks::thread_list_lock_->TryLock(self); 549 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 550 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 551 } 552 } 553 std::ostringstream ss; 554 Runtime::Current()->GetThreadList()->DumpLocked(ss); 555 LOG(FATAL) << ss.str(); 556} 557 558void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 559 DCHECK(delta == -1 || delta == +1 || delta == -debug_suspend_count_) 560 << delta << " " << debug_suspend_count_ << " " << this; 561 DCHECK_GE(suspend_count_, debug_suspend_count_) << this; 562 Locks::thread_suspend_count_lock_->AssertHeld(self); 563 if (this != self && !IsSuspended()) { 564 Locks::thread_list_lock_->AssertHeld(self); 565 } 566 if (UNLIKELY(delta < 0 && suspend_count_ <= 0)) { 567 UnsafeLogFatalForSuspendCount(self, this); 568 return; 569 } 570 571 suspend_count_ += delta; 572 if (for_debugger) { 573 debug_suspend_count_ += delta; 574 } 575 576 if (suspend_count_ == 0) { 577 AtomicClearFlag(kSuspendRequest); 578 } else { 579 AtomicSetFlag(kSuspendRequest); 580 TriggerSuspend(); 581 } 582} 583 584void Thread::RunCheckpointFunction() { 585 Closure *checkpoints[kMaxCheckpoints]; 586 587 // Grab the suspend_count lock and copy the current set of 588 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 589 // function will also grab this lock so we prevent a race between setting 590 // the kCheckpointRequest flag and clearing it. 591 { 592 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 593 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 594 checkpoints[i] = checkpoint_functions_[i]; 595 checkpoint_functions_[i] = nullptr; 596 } 597 AtomicClearFlag(kCheckpointRequest); 598 } 599 600 // Outside the lock, run all the checkpoint functions that 601 // we collected. 602 bool found_checkpoint = false; 603 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 604 if (checkpoints[i] != nullptr) { 605 ATRACE_BEGIN("Checkpoint function"); 606 checkpoints[i]->Run(this); 607 ATRACE_END(); 608 found_checkpoint = true; 609 } 610 } 611 CHECK(found_checkpoint); 612} 613 614bool Thread::RequestCheckpoint(Closure* function) { 615 union StateAndFlags old_state_and_flags; 616 old_state_and_flags.as_int = state_and_flags_.as_int; 617 if (old_state_and_flags.as_struct.state != kRunnable) { 618 return false; // Fail, thread is suspended and so can't run a checkpoint. 619 } 620 621 uint32_t available_checkpoint = kMaxCheckpoints; 622 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 623 if (checkpoint_functions_[i] == nullptr) { 624 available_checkpoint = i; 625 break; 626 } 627 } 628 if (available_checkpoint == kMaxCheckpoints) { 629 // No checkpoint functions available, we can't run a checkpoint 630 return false; 631 } 632 checkpoint_functions_[available_checkpoint] = function; 633 634 // Checkpoint function installed now install flag bit. 635 // We must be runnable to request a checkpoint. 636 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 637 union StateAndFlags new_state_and_flags; 638 new_state_and_flags.as_int = old_state_and_flags.as_int; 639 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 640 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 641 &state_and_flags_.as_int); 642 if (UNLIKELY(succeeded != 0)) { 643 // The thread changed state before the checkpoint was installed. 644 CHECK_EQ(checkpoint_functions_[available_checkpoint], function); 645 checkpoint_functions_[available_checkpoint] = nullptr; 646 } else { 647 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 648 TriggerSuspend(); 649 } 650 return succeeded == 0; 651} 652 653void Thread::FullSuspendCheck() { 654 VLOG(threads) << this << " self-suspending"; 655 ATRACE_BEGIN("Full suspend check"); 656 // Make thread appear suspended to other threads, release mutator_lock_. 657 TransitionFromRunnableToSuspended(kSuspended); 658 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 659 TransitionFromSuspendedToRunnable(); 660 ATRACE_END(); 661 VLOG(threads) << this << " self-reviving"; 662} 663 664void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 665 std::string group_name; 666 int priority; 667 bool is_daemon = false; 668 Thread* self = Thread::Current(); 669 670 if (self != nullptr && thread != nullptr && thread->opeer_ != nullptr) { 671 ScopedObjectAccessUnchecked soa(self); 672 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)->GetInt(thread->opeer_); 673 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)->GetBoolean(thread->opeer_); 674 675 mirror::Object* thread_group = 676 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->opeer_); 677 678 if (thread_group != nullptr) { 679 mirror::ArtField* group_name_field = 680 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 681 mirror::String* group_name_string = 682 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 683 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 684 } 685 } else { 686 priority = GetNativePriority(); 687 } 688 689 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 690 if (scheduler_group_name.empty()) { 691 scheduler_group_name = "default"; 692 } 693 694 if (thread != nullptr) { 695 os << '"' << *thread->name_ << '"'; 696 if (is_daemon) { 697 os << " daemon"; 698 } 699 os << " prio=" << priority 700 << " tid=" << thread->GetThreadId() 701 << " " << thread->GetState(); 702 if (thread->IsStillStarting()) { 703 os << " (still starting up)"; 704 } 705 os << "\n"; 706 } else { 707 os << '"' << ::art::GetThreadName(tid) << '"' 708 << " prio=" << priority 709 << " (not attached)\n"; 710 } 711 712 if (thread != nullptr) { 713 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 714 os << " | group=\"" << group_name << "\"" 715 << " sCount=" << thread->suspend_count_ 716 << " dsCount=" << thread->debug_suspend_count_ 717 << " obj=" << reinterpret_cast<void*>(thread->opeer_) 718 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 719 } 720 721 os << " | sysTid=" << tid 722 << " nice=" << getpriority(PRIO_PROCESS, tid) 723 << " cgrp=" << scheduler_group_name; 724 if (thread != nullptr) { 725 int policy; 726 sched_param sp; 727 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->pthread_self_, &policy, &sp), __FUNCTION__); 728 os << " sched=" << policy << "/" << sp.sched_priority 729 << " handle=" << reinterpret_cast<void*>(thread->pthread_self_); 730 } 731 os << "\n"; 732 733 // Grab the scheduler stats for this thread. 734 std::string scheduler_stats; 735 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 736 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 737 } else { 738 scheduler_stats = "0 0 0"; 739 } 740 741 char native_thread_state = '?'; 742 int utime = 0; 743 int stime = 0; 744 int task_cpu = 0; 745 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 746 747 os << " | state=" << native_thread_state 748 << " schedstat=( " << scheduler_stats << " )" 749 << " utm=" << utime 750 << " stm=" << stime 751 << " core=" << task_cpu 752 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 753 if (thread != nullptr) { 754 os << " | stack=" << reinterpret_cast<void*>(thread->stack_begin_) << "-" << reinterpret_cast<void*>(thread->stack_end_) 755 << " stackSize=" << PrettySize(thread->stack_size_) << "\n"; 756 } 757} 758 759void Thread::DumpState(std::ostream& os) const { 760 Thread::DumpState(os, this, GetTid()); 761} 762 763struct StackDumpVisitor : public StackVisitor { 764 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 765 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 766 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 767 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 768 } 769 770 virtual ~StackDumpVisitor() { 771 if (frame_count == 0) { 772 os << " (no managed stack frames)\n"; 773 } 774 } 775 776 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 777 mirror::ArtMethod* m = GetMethod(); 778 if (m->IsRuntimeMethod()) { 779 return true; 780 } 781 const int kMaxRepetition = 3; 782 mirror::Class* c = m->GetDeclaringClass(); 783 mirror::DexCache* dex_cache = c->GetDexCache(); 784 int line_number = -1; 785 if (dex_cache != nullptr) { // be tolerant of bad input 786 const DexFile& dex_file = *dex_cache->GetDexFile(); 787 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 788 } 789 if (line_number == last_line_number && last_method == m) { 790 ++repetition_count; 791 } else { 792 if (repetition_count >= kMaxRepetition) { 793 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 794 } 795 repetition_count = 0; 796 last_line_number = line_number; 797 last_method = m; 798 } 799 if (repetition_count < kMaxRepetition) { 800 os << " at " << PrettyMethod(m, false); 801 if (m->IsNative()) { 802 os << "(Native method)"; 803 } else { 804 mh.ChangeMethod(m); 805 const char* source_file(mh.GetDeclaringClassSourceFile()); 806 os << "(" << (source_file != nullptr ? source_file : "unavailable") 807 << ":" << line_number << ")"; 808 } 809 os << "\n"; 810 if (frame_count == 0) { 811 Monitor::DescribeWait(os, thread); 812 } 813 if (can_allocate) { 814 Monitor::VisitLocks(this, DumpLockedObject, &os); 815 } 816 } 817 818 ++frame_count; 819 return true; 820 } 821 822 static void DumpLockedObject(mirror::Object* o, void* context) 823 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 824 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 825 os << " - locked <" << o << "> (a " << PrettyTypeOf(o) << ")\n"; 826 } 827 828 std::ostream& os; 829 const Thread* thread; 830 const bool can_allocate; 831 MethodHelper mh; 832 mirror::ArtMethod* last_method; 833 int last_line_number; 834 int repetition_count; 835 int frame_count; 836}; 837 838static bool ShouldShowNativeStack(const Thread* thread) 839 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 840 ThreadState state = thread->GetState(); 841 842 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 843 if (state > kWaiting && state < kStarting) { 844 return true; 845 } 846 847 // In an Object.wait variant or Thread.sleep? That's not interesting. 848 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 849 return false; 850 } 851 852 // In some other native method? That's interesting. 853 // We don't just check kNative because native methods will be in state kSuspended if they're 854 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 855 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 856 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 857 return current_method != nullptr && current_method->IsNative(); 858} 859 860void Thread::DumpStack(std::ostream& os) const { 861 // TODO: we call this code when dying but may not have suspended the thread ourself. The 862 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 863 // the race with the thread_suspend_count_lock_). 864 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 865 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 866 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 867 // If we're currently in native code, dump that stack before dumping the managed stack. 868 if (dump_for_abort || ShouldShowNativeStack(this)) { 869 DumpKernelStack(os, GetTid(), " kernel: ", false); 870 SirtRef<mirror::ArtMethod> method_ref(Thread::Current(), GetCurrentMethod(nullptr)); 871 DumpNativeStack(os, GetTid(), " native: ", false, method_ref.get()); 872 } 873 UniquePtr<Context> context(Context::Create()); 874 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), !throwing_OutOfMemoryError_); 875 dumper.WalkStack(); 876 } else { 877 os << "Not able to dump stack of thread that isn't suspended"; 878 } 879} 880 881void Thread::ThreadExitCallback(void* arg) { 882 Thread* self = reinterpret_cast<Thread*>(arg); 883 if (self->thread_exit_check_count_ == 0) { 884 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's going to use a pthread_key_create destructor?): " << *self; 885 CHECK(is_started_); 886 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 887 self->thread_exit_check_count_ = 1; 888 } else { 889 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 890 } 891} 892 893void Thread::Startup() { 894 CHECK(!is_started_); 895 is_started_ = true; 896 { 897 // MutexLock to keep annotalysis happy. 898 // 899 // Note we use nullptr for the thread because Thread::Current can 900 // return garbage since (is_started_ == true) and 901 // Thread::pthread_key_self_ is not yet initialized. 902 // This was seen on glibc. 903 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 904 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 905 *Locks::thread_suspend_count_lock_); 906 } 907 908 // Allocate a TLS slot. 909 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 910 911 // Double-check the TLS slot allocation. 912 if (pthread_getspecific(pthread_key_self_) != nullptr) { 913 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 914 } 915} 916 917void Thread::FinishStartup() { 918 Runtime* runtime = Runtime::Current(); 919 CHECK(runtime->IsStarted()); 920 921 // Finish attaching the main thread. 922 ScopedObjectAccess soa(Thread::Current()); 923 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 924 925 Runtime::Current()->GetClassLinker()->RunRootClinits(); 926} 927 928void Thread::Shutdown() { 929 CHECK(is_started_); 930 is_started_ = false; 931 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 932 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 933 if (resume_cond_ != nullptr) { 934 delete resume_cond_; 935 resume_cond_ = nullptr; 936 } 937} 938 939Thread::Thread(bool daemon) 940 : suspend_count_(0), 941 card_table_(nullptr), 942 exception_(nullptr), 943 stack_end_(nullptr), 944 managed_stack_(), 945 jni_env_(nullptr), 946 self_(nullptr), 947 opeer_(nullptr), 948 jpeer_(nullptr), 949 stack_begin_(nullptr), 950 stack_size_(0), 951 thin_lock_thread_id_(0), 952 stack_trace_sample_(nullptr), 953 trace_clock_base_(0), 954 tid_(0), 955 wait_mutex_(new Mutex("a thread wait mutex")), 956 wait_cond_(new ConditionVariable("a thread wait condition variable", *wait_mutex_)), 957 wait_monitor_(nullptr), 958 interrupted_(false), 959 wait_next_(nullptr), 960 monitor_enter_object_(nullptr), 961 top_sirt_(nullptr), 962 runtime_(nullptr), 963 class_loader_override_(nullptr), 964 long_jump_context_(nullptr), 965 throwing_OutOfMemoryError_(false), 966 debug_suspend_count_(0), 967 debug_invoke_req_(new DebugInvokeReq), 968 single_step_control_(new SingleStepControl), 969 deoptimization_shadow_frame_(nullptr), 970 instrumentation_stack_(new std::deque<instrumentation::InstrumentationStackFrame>), 971 name_(new std::string(kThreadNameDuringStartup)), 972 daemon_(daemon), 973 pthread_self_(0), 974 no_thread_suspension_(0), 975 last_no_thread_suspension_cause_(nullptr), 976 thread_exit_check_count_(0), 977 thread_local_start_(nullptr), 978 thread_local_pos_(nullptr), 979 thread_local_end_(nullptr), 980 thread_local_objects_(0), 981 thread_local_alloc_stack_top_(nullptr), 982 thread_local_alloc_stack_end_(nullptr) { 983 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 984 state_and_flags_.as_struct.flags = 0; 985 state_and_flags_.as_struct.state = kNative; 986 memset(&held_mutexes_[0], 0, sizeof(held_mutexes_)); 987 memset(rosalloc_runs_, 0, sizeof(rosalloc_runs_)); 988 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 989 checkpoint_functions_[i] = nullptr; 990 } 991} 992 993bool Thread::IsStillStarting() const { 994 // You might think you can check whether the state is kStarting, but for much of thread startup, 995 // the thread is in kNative; it might also be in kVmWait. 996 // You might think you can check whether the peer is nullptr, but the peer is actually created and 997 // assigned fairly early on, and needs to be. 998 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 999 // this thread _ever_ entered kRunnable". 1000 return (jpeer_ == nullptr && opeer_ == nullptr) || (*name_ == kThreadNameDuringStartup); 1001} 1002 1003void Thread::AssertNoPendingException() const { 1004 if (UNLIKELY(IsExceptionPending())) { 1005 ScopedObjectAccess soa(Thread::Current()); 1006 mirror::Throwable* exception = GetException(nullptr); 1007 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1008 } 1009} 1010 1011void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1012 if (UNLIKELY(IsExceptionPending())) { 1013 ScopedObjectAccess soa(Thread::Current()); 1014 mirror::Throwable* exception = GetException(nullptr); 1015 LOG(FATAL) << "Throwing new exception " << msg << " with unexpected pending exception: " 1016 << exception->Dump(); 1017 } 1018} 1019 1020static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1021 RootType /*root_type*/) 1022 NO_THREAD_SAFETY_ANALYSIS { 1023 Thread* self = reinterpret_cast<Thread*>(arg); 1024 mirror::Object* entered_monitor = *object; 1025 if (self->HoldsLock(entered_monitor)) { 1026 LOG(WARNING) << "Calling MonitorExit on object " 1027 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1028 << " left locked by native thread " 1029 << *Thread::Current() << " which is detaching"; 1030 entered_monitor->MonitorExit(self); 1031 } 1032} 1033 1034void Thread::Destroy() { 1035 Thread* self = this; 1036 DCHECK_EQ(self, Thread::Current()); 1037 1038 if (opeer_ != nullptr) { 1039 ScopedObjectAccess soa(self); 1040 // We may need to call user-supplied managed code, do this before final clean-up. 1041 HandleUncaughtExceptions(soa); 1042 RemoveFromThreadGroup(soa); 1043 1044 // this.nativePeer = 0; 1045 if (Runtime::Current()->IsActiveTransaction()) { 1046 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong<true>(opeer_, 0); 1047 } else { 1048 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong<false>(opeer_, 0); 1049 } 1050 Dbg::PostThreadDeath(self); 1051 1052 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1053 // who is waiting. 1054 mirror::Object* lock = 1055 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 1056 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1057 if (lock != nullptr) { 1058 SirtRef<mirror::Object> sirt_obj(self, lock); 1059 ObjectLock<mirror::Object> locker(self, &sirt_obj); 1060 locker.Notify(); 1061 } 1062 } 1063 1064 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1065 if (jni_env_ != nullptr) { 1066 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1067 } 1068} 1069 1070Thread::~Thread() { 1071 if (jni_env_ != nullptr && jpeer_ != nullptr) { 1072 // If pthread_create fails we don't have a jni env here. 1073 jni_env_->DeleteGlobalRef(jpeer_); 1074 jpeer_ = nullptr; 1075 } 1076 opeer_ = nullptr; 1077 1078 bool initialized = (jni_env_ != nullptr); // Did Thread::Init run? 1079 if (initialized) { 1080 delete jni_env_; 1081 jni_env_ = nullptr; 1082 } 1083 CHECK_NE(GetState(), kRunnable); 1084 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1085 CHECK(checkpoint_functions_[0] == nullptr); 1086 CHECK(checkpoint_functions_[1] == nullptr); 1087 CHECK(checkpoint_functions_[2] == nullptr); 1088 1089 // We may be deleting a still born thread. 1090 SetStateUnsafe(kTerminated); 1091 1092 delete wait_cond_; 1093 delete wait_mutex_; 1094 1095 if (long_jump_context_ != nullptr) { 1096 delete long_jump_context_; 1097 } 1098 1099 if (initialized) { 1100 CleanupCpu(); 1101 } 1102 1103 delete debug_invoke_req_; 1104 delete single_step_control_; 1105 delete instrumentation_stack_; 1106 delete name_; 1107 delete stack_trace_sample_; 1108 1109 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1110 1111 TearDownAlternateSignalStack(); 1112} 1113 1114void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1115 if (!IsExceptionPending()) { 1116 return; 1117 } 1118 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1119 ScopedThreadStateChange tsc(this, kNative); 1120 1121 // Get and clear the exception. 1122 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1123 jni_env_->ExceptionClear(); 1124 1125 // If the thread has its own handler, use that. 1126 ScopedLocalRef<jobject> handler(jni_env_, 1127 jni_env_->GetObjectField(peer.get(), 1128 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1129 if (handler.get() == nullptr) { 1130 // Otherwise use the thread group's default handler. 1131 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1132 } 1133 1134 // Call the handler. 1135 jni_env_->CallVoidMethod(handler.get(), 1136 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1137 peer.get(), exception.get()); 1138 1139 // If the handler threw, clear that exception too. 1140 jni_env_->ExceptionClear(); 1141} 1142 1143void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1144 // this.group.removeThread(this); 1145 // group can be null if we're in the compiler or a test. 1146 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1147 if (ogroup != nullptr) { 1148 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1149 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1150 ScopedThreadStateChange tsc(soa.Self(), kNative); 1151 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1152 peer.get()); 1153 } 1154} 1155 1156size_t Thread::NumSirtReferences() { 1157 size_t count = 0; 1158 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1159 count += cur->NumberOfReferences(); 1160 } 1161 return count; 1162} 1163 1164bool Thread::SirtContains(jobject obj) const { 1165 StackReference<mirror::Object>* sirt_entry = 1166 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1167 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1168 if (cur->Contains(sirt_entry)) { 1169 return true; 1170 } 1171 } 1172 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1173 return managed_stack_.ShadowFramesContain(sirt_entry); 1174} 1175 1176void Thread::SirtVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1177 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1178 size_t num_refs = cur->NumberOfReferences(); 1179 for (size_t j = 0; j < num_refs; ++j) { 1180 mirror::Object* object = cur->GetReference(j); 1181 if (object != nullptr) { 1182 mirror::Object* old_obj = object; 1183 visitor(&object, arg, thread_id, kRootNativeStack); 1184 if (old_obj != object) { 1185 cur->SetReference(j, object); 1186 } 1187 } 1188 } 1189 } 1190} 1191 1192mirror::Object* Thread::DecodeJObject(jobject obj) const { 1193 Locks::mutator_lock_->AssertSharedHeld(this); 1194 if (obj == nullptr) { 1195 return nullptr; 1196 } 1197 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1198 IndirectRefKind kind = GetIndirectRefKind(ref); 1199 mirror::Object* result; 1200 // The "kinds" below are sorted by the frequency we expect to encounter them. 1201 if (kind == kLocal) { 1202 IndirectReferenceTable& locals = jni_env_->locals; 1203 result = locals.Get(ref); 1204 } else if (kind == kSirtOrInvalid) { 1205 // TODO: make stack indirect reference table lookup more efficient. 1206 // Check if this is a local reference in the SIRT. 1207 if (LIKELY(SirtContains(obj))) { 1208 // Read from SIRT. 1209 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1210 VerifyObject(result); 1211 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1212 // Assume an invalid local reference is actually a direct pointer. 1213 result = reinterpret_cast<mirror::Object*>(obj); 1214 VerifyObject(result); 1215 } else { 1216 result = kInvalidIndirectRefObject; 1217 } 1218 } else if (kind == kGlobal) { 1219 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1220 IndirectReferenceTable& globals = vm->globals; 1221 ReaderMutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1222 result = const_cast<mirror::Object*>(globals.Get(ref)); 1223 } else { 1224 DCHECK_EQ(kind, kWeakGlobal); 1225 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1226 if (result == kClearedJniWeakGlobal) { 1227 // This is a special case where it's okay to return nullptr. 1228 return nullptr; 1229 } 1230 } 1231 1232 if (UNLIKELY(result == nullptr)) { 1233 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1234 } 1235 return result; 1236} 1237 1238// Implements java.lang.Thread.interrupted. 1239bool Thread::Interrupted() { 1240 MutexLock mu(Thread::Current(), *wait_mutex_); 1241 bool interrupted = interrupted_; 1242 interrupted_ = false; 1243 return interrupted; 1244} 1245 1246// Implements java.lang.Thread.isInterrupted. 1247bool Thread::IsInterrupted() { 1248 MutexLock mu(Thread::Current(), *wait_mutex_); 1249 return interrupted_; 1250} 1251 1252void Thread::Interrupt() { 1253 Thread* self = Thread::Current(); 1254 MutexLock mu(self, *wait_mutex_); 1255 if (interrupted_) { 1256 return; 1257 } 1258 interrupted_ = true; 1259 NotifyLocked(self); 1260} 1261 1262void Thread::Notify() { 1263 Thread* self = Thread::Current(); 1264 MutexLock mu(self, *wait_mutex_); 1265 NotifyLocked(self); 1266} 1267 1268void Thread::NotifyLocked(Thread* self) { 1269 if (wait_monitor_ != nullptr) { 1270 wait_cond_->Signal(self); 1271 } 1272} 1273 1274class CountStackDepthVisitor : public StackVisitor { 1275 public: 1276 explicit CountStackDepthVisitor(Thread* thread) 1277 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1278 : StackVisitor(thread, nullptr), 1279 depth_(0), skip_depth_(0), skipping_(true) {} 1280 1281 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1282 // We want to skip frames up to and including the exception's constructor. 1283 // Note we also skip the frame if it doesn't have a method (namely the callee 1284 // save frame) 1285 mirror::ArtMethod* m = GetMethod(); 1286 if (skipping_ && !m->IsRuntimeMethod() && 1287 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1288 skipping_ = false; 1289 } 1290 if (!skipping_) { 1291 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1292 ++depth_; 1293 } 1294 } else { 1295 ++skip_depth_; 1296 } 1297 return true; 1298 } 1299 1300 int GetDepth() const { 1301 return depth_; 1302 } 1303 1304 int GetSkipDepth() const { 1305 return skip_depth_; 1306 } 1307 1308 private: 1309 uint32_t depth_; 1310 uint32_t skip_depth_; 1311 bool skipping_; 1312}; 1313 1314class BuildInternalStackTraceVisitor : public StackVisitor { 1315 public: 1316 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1317 : StackVisitor(thread, nullptr), self_(self), 1318 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1319 1320 bool Init(int depth) 1321 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1322 // Allocate method trace with an extra slot that will hold the PC trace 1323 SirtRef<mirror::ObjectArray<mirror::Object> > 1324 method_trace(self_, 1325 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1326 depth + 1)); 1327 if (method_trace.get() == nullptr) { 1328 return false; 1329 } 1330 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1331 if (dex_pc_trace == nullptr) { 1332 return false; 1333 } 1334 // Save PC trace in last element of method trace, also places it into the 1335 // object graph. 1336 // We are called from native: use non-transactional mode. 1337 method_trace->Set<false>(depth, dex_pc_trace); 1338 // Set the Object*s and assert that no thread suspension is now possible. 1339 const char* last_no_suspend_cause = 1340 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1341 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1342 method_trace_ = method_trace.get(); 1343 dex_pc_trace_ = dex_pc_trace; 1344 return true; 1345 } 1346 1347 virtual ~BuildInternalStackTraceVisitor() { 1348 if (method_trace_ != nullptr) { 1349 self_->EndAssertNoThreadSuspension(nullptr); 1350 } 1351 } 1352 1353 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1354 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1355 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1356 } 1357 if (skip_depth_ > 0) { 1358 skip_depth_--; 1359 return true; 1360 } 1361 mirror::ArtMethod* m = GetMethod(); 1362 if (m->IsRuntimeMethod()) { 1363 return true; // Ignore runtime frames (in particular callee save). 1364 } 1365 // TODO dedup this code. 1366 if (Runtime::Current()->IsActiveTransaction()) { 1367 method_trace_->Set<true>(count_, m); 1368 dex_pc_trace_->Set<true>(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1369 } else { 1370 method_trace_->Set<false>(count_, m); 1371 dex_pc_trace_->Set<false>(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1372 } 1373 ++count_; 1374 return true; 1375 } 1376 1377 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1378 return method_trace_; 1379 } 1380 1381 private: 1382 Thread* const self_; 1383 // How many more frames to skip. 1384 int32_t skip_depth_; 1385 // Current position down stack trace. 1386 uint32_t count_; 1387 // Array of dex PC values. 1388 mirror::IntArray* dex_pc_trace_; 1389 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1390 mirror::ObjectArray<mirror::Object>* method_trace_; 1391}; 1392 1393jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1394 // Compute depth of stack 1395 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1396 count_visitor.WalkStack(); 1397 int32_t depth = count_visitor.GetDepth(); 1398 int32_t skip_depth = count_visitor.GetSkipDepth(); 1399 1400 // Build internal stack trace. 1401 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1402 skip_depth); 1403 if (!build_trace_visitor.Init(depth)) { 1404 return nullptr; // Allocation failed. 1405 } 1406 build_trace_visitor.WalkStack(); 1407 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1408 if (kIsDebugBuild) { 1409 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1410 CHECK(trace->Get(i) != nullptr); 1411 } 1412 } 1413 return soa.AddLocalReference<jobjectArray>(trace); 1414} 1415 1416jobjectArray Thread::InternalStackTraceToStackTraceElementArray(JNIEnv* env, jobject internal, 1417 jobjectArray output_array, int* stack_depth) { 1418 // Transition into runnable state to work on Object*/Array* 1419 ScopedObjectAccess soa(env); 1420 // Decode the internal stack trace into the depth, method trace and PC trace 1421 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1422 1423 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1424 1425 jobjectArray result; 1426 1427 if (output_array != nullptr) { 1428 // Reuse the array we were given. 1429 result = output_array; 1430 // ...adjusting the number of frames we'll write to not exceed the array length. 1431 const int32_t traces_length = 1432 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1433 depth = std::min(depth, traces_length); 1434 } else { 1435 // Create java_trace array and place in local reference table 1436 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1437 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1438 if (java_traces == nullptr) { 1439 return nullptr; 1440 } 1441 result = soa.AddLocalReference<jobjectArray>(java_traces); 1442 } 1443 1444 if (stack_depth != nullptr) { 1445 *stack_depth = depth; 1446 } 1447 1448 for (int32_t i = 0; i < depth; ++i) { 1449 mirror::ObjectArray<mirror::Object>* method_trace = 1450 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1451 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1452 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1453 MethodHelper mh(method); 1454 int32_t line_number; 1455 SirtRef<mirror::String> class_name_object(soa.Self(), nullptr); 1456 SirtRef<mirror::String> source_name_object(soa.Self(), nullptr); 1457 if (method->IsProxyMethod()) { 1458 line_number = -1; 1459 class_name_object.reset(method->GetDeclaringClass()->GetName()); 1460 // source_name_object intentionally left null for proxy methods 1461 } else { 1462 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1463 uint32_t dex_pc = pc_trace->Get(i); 1464 line_number = mh.GetLineNumFromDexPC(dex_pc); 1465 // Allocate element, potentially triggering GC 1466 // TODO: reuse class_name_object via Class::name_? 1467 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1468 CHECK(descriptor != nullptr); 1469 std::string class_name(PrettyDescriptor(descriptor)); 1470 class_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1471 if (class_name_object.get() == nullptr) { 1472 return nullptr; 1473 } 1474 const char* source_file = mh.GetDeclaringClassSourceFile(); 1475 if (source_file != nullptr) { 1476 source_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1477 if (source_name_object.get() == nullptr) { 1478 return nullptr; 1479 } 1480 } 1481 } 1482 const char* method_name = mh.GetName(); 1483 CHECK(method_name != nullptr); 1484 SirtRef<mirror::String> method_name_object(soa.Self(), 1485 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1486 method_name)); 1487 if (method_name_object.get() == nullptr) { 1488 return nullptr; 1489 } 1490 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1491 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1492 if (obj == nullptr) { 1493 return nullptr; 1494 } 1495 // We are called from native: use non-transactional mode. 1496 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1497 } 1498 return result; 1499} 1500 1501void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1502 const char* exception_class_descriptor, const char* fmt, ...) { 1503 va_list args; 1504 va_start(args, fmt); 1505 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1506 fmt, args); 1507 va_end(args); 1508} 1509 1510void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1511 const char* exception_class_descriptor, 1512 const char* fmt, va_list ap) { 1513 std::string msg; 1514 StringAppendV(&msg, fmt, ap); 1515 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1516} 1517 1518void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1519 const char* msg) { 1520 // Callers should either clear or call ThrowNewWrappedException. 1521 AssertNoPendingExceptionForNewException(msg); 1522 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1523} 1524 1525void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1526 const char* exception_class_descriptor, 1527 const char* msg) { 1528 DCHECK_EQ(this, Thread::Current()); 1529 // Ensure we don't forget arguments over object allocation. 1530 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1531 SirtRef<mirror::ArtMethod> saved_throw_method(this, throw_location.GetMethod()); 1532 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1533 SirtRef<mirror::Throwable> cause(this, GetException(nullptr)); 1534 ClearException(); 1535 Runtime* runtime = Runtime::Current(); 1536 1537 mirror::ClassLoader* cl = nullptr; 1538 if (saved_throw_method.get() != nullptr) { 1539 cl = saved_throw_method.get()->GetDeclaringClass()->GetClassLoader(); 1540 } 1541 SirtRef<mirror::ClassLoader> class_loader(this, cl); 1542 SirtRef<mirror::Class> 1543 exception_class(this, runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1544 class_loader)); 1545 if (UNLIKELY(exception_class.get() == nullptr)) { 1546 CHECK(IsExceptionPending()); 1547 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1548 return; 1549 } 1550 1551 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1552 DCHECK(IsExceptionPending()); 1553 return; 1554 } 1555 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1556 SirtRef<mirror::Throwable> exception(this, 1557 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1558 1559 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1560 if (exception.get() == nullptr) { 1561 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1562 throw_location.GetDexPc()); 1563 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1564 return; 1565 } 1566 1567 // Choose an appropriate constructor and set up the arguments. 1568 const char* signature; 1569 const char* shorty; 1570 SirtRef<mirror::String> msg_string(this, nullptr); 1571 if (msg != nullptr) { 1572 // Ensure we remember this and the method over the String allocation. 1573 msg_string.reset(mirror::String::AllocFromModifiedUtf8(this, msg)); 1574 if (UNLIKELY(msg_string.get() == nullptr)) { 1575 CHECK(IsExceptionPending()); // OOME. 1576 return; 1577 } 1578 if (cause.get() == nullptr) { 1579 shorty = "VL"; 1580 signature = "(Ljava/lang/String;)V"; 1581 } else { 1582 shorty = "VLL"; 1583 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1584 } 1585 } else { 1586 if (cause.get() == nullptr) { 1587 shorty = "V"; 1588 signature = "()V"; 1589 } else { 1590 shorty = "VL"; 1591 signature = "(Ljava/lang/Throwable;)V"; 1592 } 1593 } 1594 mirror::ArtMethod* exception_init_method = 1595 exception_class->FindDeclaredDirectMethod("<init>", signature); 1596 1597 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1598 << PrettyDescriptor(exception_class_descriptor); 1599 1600 if (UNLIKELY(!runtime->IsStarted())) { 1601 // Something is trying to throw an exception without a started runtime, which is the common 1602 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1603 // the exception fields directly. 1604 if (msg != nullptr) { 1605 exception->SetDetailMessage(msg_string.get()); 1606 } 1607 if (cause.get() != nullptr) { 1608 exception->SetCause(cause.get()); 1609 } 1610 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1611 throw_location.GetDexPc()); 1612 SetException(gc_safe_throw_location, exception.get()); 1613 } else { 1614 ArgArray args(shorty, strlen(shorty)); 1615 args.Append(exception.get()); 1616 if (msg != nullptr) { 1617 args.Append(msg_string.get()); 1618 } 1619 if (cause.get() != nullptr) { 1620 args.Append(cause.get()); 1621 } 1622 JValue result; 1623 exception_init_method->Invoke(this, args.GetArray(), args.GetNumBytes(), &result, shorty); 1624 if (LIKELY(!IsExceptionPending())) { 1625 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1626 throw_location.GetDexPc()); 1627 SetException(gc_safe_throw_location, exception.get()); 1628 } 1629 } 1630} 1631 1632void Thread::ThrowOutOfMemoryError(const char* msg) { 1633 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1634 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1635 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1636 if (!throwing_OutOfMemoryError_) { 1637 throwing_OutOfMemoryError_ = true; 1638 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1639 throwing_OutOfMemoryError_ = false; 1640 } else { 1641 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1642 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1643 } 1644} 1645 1646Thread* Thread::CurrentFromGdb() { 1647 return Thread::Current(); 1648} 1649 1650void Thread::DumpFromGdb() const { 1651 std::ostringstream ss; 1652 Dump(ss); 1653 std::string str(ss.str()); 1654 // log to stderr for debugging command line processes 1655 std::cerr << str; 1656#ifdef HAVE_ANDROID_OS 1657 // log to logcat for debugging frameworks processes 1658 LOG(INFO) << str; 1659#endif 1660} 1661 1662struct EntryPointInfo { 1663 uint32_t offset; 1664 const char* name; 1665}; 1666#define INTERPRETER_ENTRY_POINT_INFO(x) { INTERPRETER_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1667#define JNI_ENTRY_POINT_INFO(x) { JNI_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1668#define PORTABLE_ENTRY_POINT_INFO(x) { PORTABLE_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1669#define QUICK_ENTRY_POINT_INFO(x) { QUICK_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1670static const EntryPointInfo gThreadEntryPointInfo[] = { 1671 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge), 1672 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge), 1673 JNI_ENTRY_POINT_INFO(pDlsymLookup), 1674 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline), 1675 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline), 1676 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge), 1677 QUICK_ENTRY_POINT_INFO(pAllocArray), 1678 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved), 1679 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck), 1680 QUICK_ENTRY_POINT_INFO(pAllocObject), 1681 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved), 1682 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized), 1683 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck), 1684 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray), 1685 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck), 1686 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial), 1687 QUICK_ENTRY_POINT_INFO(pCheckCast), 1688 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage), 1689 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess), 1690 QUICK_ENTRY_POINT_INFO(pInitializeType), 1691 QUICK_ENTRY_POINT_INFO(pResolveString), 1692 QUICK_ENTRY_POINT_INFO(pSet32Instance), 1693 QUICK_ENTRY_POINT_INFO(pSet32Static), 1694 QUICK_ENTRY_POINT_INFO(pSet64Instance), 1695 QUICK_ENTRY_POINT_INFO(pSet64Static), 1696 QUICK_ENTRY_POINT_INFO(pSetObjInstance), 1697 QUICK_ENTRY_POINT_INFO(pSetObjStatic), 1698 QUICK_ENTRY_POINT_INFO(pGet32Instance), 1699 QUICK_ENTRY_POINT_INFO(pGet32Static), 1700 QUICK_ENTRY_POINT_INFO(pGet64Instance), 1701 QUICK_ENTRY_POINT_INFO(pGet64Static), 1702 QUICK_ENTRY_POINT_INFO(pGetObjInstance), 1703 QUICK_ENTRY_POINT_INFO(pGetObjStatic), 1704 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck), 1705 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck), 1706 QUICK_ENTRY_POINT_INFO(pAputObject), 1707 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData), 1708 QUICK_ENTRY_POINT_INFO(pJniMethodStart), 1709 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1710 QUICK_ENTRY_POINT_INFO(pJniMethodEnd), 1711 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1712 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference), 1713 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1714 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline), 1715 QUICK_ENTRY_POINT_INFO(pLockObject), 1716 QUICK_ENTRY_POINT_INFO(pUnlockObject), 1717 QUICK_ENTRY_POINT_INFO(pCmpgDouble), 1718 QUICK_ENTRY_POINT_INFO(pCmpgFloat), 1719 QUICK_ENTRY_POINT_INFO(pCmplDouble), 1720 QUICK_ENTRY_POINT_INFO(pCmplFloat), 1721 QUICK_ENTRY_POINT_INFO(pFmod), 1722 QUICK_ENTRY_POINT_INFO(pSqrt), 1723 QUICK_ENTRY_POINT_INFO(pL2d), 1724 QUICK_ENTRY_POINT_INFO(pFmodf), 1725 QUICK_ENTRY_POINT_INFO(pL2f), 1726 QUICK_ENTRY_POINT_INFO(pD2iz), 1727 QUICK_ENTRY_POINT_INFO(pF2iz), 1728 QUICK_ENTRY_POINT_INFO(pIdivmod), 1729 QUICK_ENTRY_POINT_INFO(pD2l), 1730 QUICK_ENTRY_POINT_INFO(pF2l), 1731 QUICK_ENTRY_POINT_INFO(pLdiv), 1732 QUICK_ENTRY_POINT_INFO(pLmod), 1733 QUICK_ENTRY_POINT_INFO(pLmul), 1734 QUICK_ENTRY_POINT_INFO(pShlLong), 1735 QUICK_ENTRY_POINT_INFO(pShrLong), 1736 QUICK_ENTRY_POINT_INFO(pUshrLong), 1737 QUICK_ENTRY_POINT_INFO(pIndexOf), 1738 QUICK_ENTRY_POINT_INFO(pMemcmp16), 1739 QUICK_ENTRY_POINT_INFO(pStringCompareTo), 1740 QUICK_ENTRY_POINT_INFO(pMemcpy), 1741 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline), 1742 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline), 1743 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge), 1744 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1745 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1746 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1747 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1748 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1749 QUICK_ENTRY_POINT_INFO(pCheckSuspend), 1750 QUICK_ENTRY_POINT_INFO(pTestSuspend), 1751 QUICK_ENTRY_POINT_INFO(pDeliverException), 1752 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds), 1753 QUICK_ENTRY_POINT_INFO(pThrowDivZero), 1754 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod), 1755 QUICK_ENTRY_POINT_INFO(pThrowNullPointer), 1756 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow), 1757}; 1758#undef QUICK_ENTRY_POINT_INFO 1759 1760void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1761 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1762 1763#define DO_THREAD_OFFSET(x) \ 1764 if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { \ 1765 os << # x; \ 1766 return; \ 1767 } 1768 DO_THREAD_OFFSET(state_and_flags_); 1769 DO_THREAD_OFFSET(card_table_); 1770 DO_THREAD_OFFSET(exception_); 1771 DO_THREAD_OFFSET(opeer_); 1772 DO_THREAD_OFFSET(jni_env_); 1773 DO_THREAD_OFFSET(self_); 1774 DO_THREAD_OFFSET(stack_end_); 1775 DO_THREAD_OFFSET(suspend_count_); 1776 DO_THREAD_OFFSET(thin_lock_thread_id_); 1777 // DO_THREAD_OFFSET(top_of_managed_stack_); 1778 // DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1779 DO_THREAD_OFFSET(top_sirt_); 1780 DO_THREAD_OFFSET(suspend_trigger_); 1781#undef DO_THREAD_OFFSET 1782 1783 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1784 CHECK_EQ(entry_point_count * size_of_pointers, 1785 sizeof(InterpreterEntryPoints) + sizeof(JniEntryPoints) + sizeof(PortableEntryPoints) + 1786 sizeof(QuickEntryPoints)); 1787 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, interpreter_entrypoints_); 1788 for (size_t i = 0; i < entry_point_count; ++i) { 1789 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1790 expected_offset += size_of_pointers; 1791 if (gThreadEntryPointInfo[i].offset == offset) { 1792 os << gThreadEntryPointInfo[i].name; 1793 return; 1794 } 1795 } 1796 os << offset; 1797} 1798 1799void Thread::QuickDeliverException() { 1800 // Get exception from thread. 1801 ThrowLocation throw_location; 1802 mirror::Throwable* exception = GetException(&throw_location); 1803 CHECK(exception != nullptr); 1804 // Don't leave exception visible while we try to find the handler, which may cause class 1805 // resolution. 1806 ClearException(); 1807 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1808 if (kDebugExceptionDelivery) { 1809 if (!is_deoptimization) { 1810 mirror::String* msg = exception->GetDetailMessage(); 1811 std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : ""); 1812 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1813 << ": " << str_msg << "\n"); 1814 } else { 1815 DumpStack(LOG(INFO) << "Deoptimizing: "); 1816 } 1817 } 1818 CatchFinder catch_finder(this, throw_location, exception, is_deoptimization); 1819 catch_finder.FindCatch(); 1820 catch_finder.UpdateInstrumentationStack(); 1821 catch_finder.DoLongJump(); 1822 LOG(FATAL) << "UNREACHABLE"; 1823} 1824 1825Context* Thread::GetLongJumpContext() { 1826 Context* result = long_jump_context_; 1827 if (result == nullptr) { 1828 result = Context::Create(); 1829 } else { 1830 long_jump_context_ = nullptr; // Avoid context being shared. 1831 result->Reset(); 1832 } 1833 return result; 1834} 1835 1836struct CurrentMethodVisitor FINAL : public StackVisitor { 1837 CurrentMethodVisitor(Thread* thread, Context* context) 1838 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1839 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1840 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1841 mirror::ArtMethod* m = GetMethod(); 1842 if (m->IsRuntimeMethod()) { 1843 // Continue if this is a runtime method. 1844 return true; 1845 } 1846 if (context_ != nullptr) { 1847 this_object_ = GetThisObject(); 1848 } 1849 method_ = m; 1850 dex_pc_ = GetDexPc(); 1851 return false; 1852 } 1853 mirror::Object* this_object_; 1854 mirror::ArtMethod* method_; 1855 uint32_t dex_pc_; 1856}; 1857 1858mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1859 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1860 visitor.WalkStack(false); 1861 if (dex_pc != nullptr) { 1862 *dex_pc = visitor.dex_pc_; 1863 } 1864 return visitor.method_; 1865} 1866 1867ThrowLocation Thread::GetCurrentLocationForThrow() { 1868 Context* context = GetLongJumpContext(); 1869 CurrentMethodVisitor visitor(this, context); 1870 visitor.WalkStack(false); 1871 ReleaseLongJumpContext(context); 1872 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1873} 1874 1875bool Thread::HoldsLock(mirror::Object* object) { 1876 if (object == nullptr) { 1877 return false; 1878 } 1879 return object->GetLockOwnerThreadId() == thin_lock_thread_id_; 1880} 1881 1882// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1883template <typename RootVisitor> 1884class ReferenceMapVisitor : public StackVisitor { 1885 public: 1886 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1887 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1888 : StackVisitor(thread, context), visitor_(visitor) {} 1889 1890 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1891 if (false) { 1892 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1893 << StringPrintf("@ PC:%04x", GetDexPc()); 1894 } 1895 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1896 if (shadow_frame != nullptr) { 1897 mirror::ArtMethod* m = shadow_frame->GetMethod(); 1898 size_t num_regs = shadow_frame->NumberOfVRegs(); 1899 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1900 // SIRT for JNI or References for interpreter. 1901 for (size_t reg = 0; reg < num_regs; ++reg) { 1902 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1903 if (ref != nullptr) { 1904 mirror::Object* new_ref = ref; 1905 visitor_(&new_ref, reg, this); 1906 if (new_ref != ref) { 1907 shadow_frame->SetVRegReference(reg, new_ref); 1908 } 1909 } 1910 } 1911 } else { 1912 // Java method. 1913 // Portable path use DexGcMap and store in Method.native_gc_map_. 1914 const uint8_t* gc_map = m->GetNativeGcMap(); 1915 CHECK(gc_map != nullptr) << PrettyMethod(m); 1916 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 1917 uint32_t dex_pc = GetDexPc(); 1918 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 1919 DCHECK(reg_bitmap != nullptr); 1920 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 1921 for (size_t reg = 0; reg < num_regs; ++reg) { 1922 if (TestBitmap(reg, reg_bitmap)) { 1923 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1924 if (ref != nullptr) { 1925 mirror::Object* new_ref = ref; 1926 visitor_(&new_ref, reg, this); 1927 if (new_ref != ref) { 1928 shadow_frame->SetVRegReference(reg, new_ref); 1929 } 1930 } 1931 } 1932 } 1933 } 1934 } else { 1935 mirror::ArtMethod* m = GetMethod(); 1936 // Process register map (which native and runtime methods don't have) 1937 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 1938 const uint8_t* native_gc_map = m->GetNativeGcMap(); 1939 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 1940 mh_.ChangeMethod(m); 1941 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 1942 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 1943 NativePcOffsetToReferenceMap map(native_gc_map); 1944 size_t num_regs = std::min(map.RegWidth() * 8, 1945 static_cast<size_t>(code_item->registers_size_)); 1946 if (num_regs > 0) { 1947 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 1948 DCHECK(reg_bitmap != nullptr); 1949 const VmapTable vmap_table(m->GetVmapTable()); 1950 uint32_t core_spills = m->GetCoreSpillMask(); 1951 uint32_t fp_spills = m->GetFpSpillMask(); 1952 size_t frame_size = m->GetFrameSizeInBytes(); 1953 // For all dex registers in the bitmap 1954 mirror::ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 1955 DCHECK(cur_quick_frame != nullptr); 1956 for (size_t reg = 0; reg < num_regs; ++reg) { 1957 // Does this register hold a reference? 1958 if (TestBitmap(reg, reg_bitmap)) { 1959 uint32_t vmap_offset; 1960 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 1961 int vmap_reg = vmap_table.ComputeRegister(core_spills, vmap_offset, kReferenceVReg); 1962 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 1963 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 1964 if (*ref_addr != nullptr) { 1965 visitor_(ref_addr, reg, this); 1966 } 1967 } else { 1968 StackReference<mirror::Object>* ref_addr = 1969 reinterpret_cast<StackReference<mirror::Object>*>( 1970 GetVRegAddr(cur_quick_frame, code_item, core_spills, fp_spills, frame_size, 1971 reg)); 1972 mirror::Object* ref = ref_addr->AsMirrorPtr(); 1973 if (ref != nullptr) { 1974 mirror::Object* new_ref = ref; 1975 visitor_(&new_ref, reg, this); 1976 if (ref != new_ref) { 1977 ref_addr->Assign(new_ref); 1978 } 1979 } 1980 } 1981 } 1982 } 1983 } 1984 } 1985 } 1986 return true; 1987 } 1988 1989 private: 1990 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 1991 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 1992 } 1993 1994 // Visitor for when we visit a root. 1995 const RootVisitor& visitor_; 1996 1997 // A method helper we keep around to avoid dex file/cache re-computations. 1998 MethodHelper mh_; 1999}; 2000 2001class RootCallbackVisitor { 2002 public: 2003 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2004 : callback_(callback), arg_(arg), tid_(tid) {} 2005 2006 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2007 callback_(obj, arg_, tid_, kRootJavaFrame); 2008 } 2009 2010 private: 2011 RootCallback* const callback_; 2012 void* const arg_; 2013 const uint32_t tid_; 2014}; 2015 2016void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2017 VerifyObject(class_loader_override); 2018 class_loader_override_ = class_loader_override; 2019} 2020 2021void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2022 uint32_t thread_id = GetThreadId(); 2023 if (opeer_ != nullptr) { 2024 visitor(&opeer_, arg, thread_id, kRootThreadObject); 2025 } 2026 if (exception_ != nullptr) { 2027 visitor(reinterpret_cast<mirror::Object**>(&exception_), arg, thread_id, kRootNativeStack); 2028 } 2029 throw_location_.VisitRoots(visitor, arg); 2030 if (class_loader_override_ != nullptr) { 2031 visitor(reinterpret_cast<mirror::Object**>(&class_loader_override_), arg, thread_id, 2032 kRootNativeStack); 2033 } 2034 jni_env_->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2035 jni_env_->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2036 SirtVisitRoots(visitor, arg, thread_id); 2037 // Visit roots on this thread's stack 2038 Context* context = GetLongJumpContext(); 2039 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2040 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2041 mapper.WalkStack(); 2042 ReleaseLongJumpContext(context); 2043 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2044 if (frame.this_object_ != nullptr) { 2045 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2046 } 2047 DCHECK(frame.method_ != nullptr); 2048 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2049 } 2050} 2051 2052static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2053 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2054 VerifyObject(*root); 2055} 2056 2057void Thread::VerifyStackImpl() { 2058 UniquePtr<Context> context(Context::Create()); 2059 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2060 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2061 mapper.WalkStack(); 2062} 2063 2064// Set the stack end to that to be used during a stack overflow 2065void Thread::SetStackEndForStackOverflow() { 2066 // During stack overflow we allow use of the full stack. 2067 if (stack_end_ == stack_begin_) { 2068 // However, we seem to have already extended to use the full stack. 2069 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2070 << kStackOverflowReservedBytes << ")?"; 2071 DumpStack(LOG(ERROR)); 2072 LOG(FATAL) << "Recursive stack overflow."; 2073 } 2074 2075 stack_end_ = stack_begin_; 2076} 2077 2078void Thread::SetTlab(byte* start, byte* end) { 2079 DCHECK_LE(start, end); 2080 thread_local_start_ = start; 2081 thread_local_pos_ = thread_local_start_; 2082 thread_local_end_ = end; 2083 thread_local_objects_ = 0; 2084} 2085 2086std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2087 thread.ShortDump(os); 2088 return os; 2089} 2090 2091} // namespace art 2092