thread.cc revision 4e30541a92381fb280cd0be9a1763b713ee4d64c
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 "gc_map.h" 44#include "gc/accounting/card_table-inl.h" 45#include "gc/heap.h" 46#include "gc/space/space.h" 47#include "invoke_arg_array_builder.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 ResetQuickAllocEntryPoints(QuickEntryPoints* qpoints); 113 114void Thread::ResetQuickAllocEntryPointsForThread() { 115 ResetQuickAllocEntryPoints(&quick_entrypoints_); 116} 117 118void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 119 deoptimization_shadow_frame_ = sf; 120} 121 122void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 123 deoptimization_return_value_.SetJ(ret_val.GetJ()); 124} 125 126ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 127 ShadowFrame* sf = deoptimization_shadow_frame_; 128 deoptimization_shadow_frame_ = nullptr; 129 ret_val->SetJ(deoptimization_return_value_.GetJ()); 130 return sf; 131} 132 133void Thread::InitTid() { 134 tid_ = ::art::GetTid(); 135} 136 137void Thread::InitAfterFork() { 138 // One thread (us) survived the fork, but we have a new tid so we need to 139 // update the value stashed in this Thread*. 140 InitTid(); 141} 142 143void* Thread::CreateCallback(void* arg) { 144 Thread* self = reinterpret_cast<Thread*>(arg); 145 Runtime* runtime = Runtime::Current(); 146 if (runtime == nullptr) { 147 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 148 return nullptr; 149 } 150 { 151 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 152 // after self->Init(). 153 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 154 // Check that if we got here we cannot be shutting down (as shutdown should never have started 155 // while threads are being born). 156 CHECK(!runtime->IsShuttingDownLocked()); 157 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 158 Runtime::Current()->EndThreadBirth(); 159 } 160 { 161 ScopedObjectAccess soa(self); 162 163 // Copy peer into self, deleting global reference when done. 164 CHECK(self->jpeer_ != nullptr); 165 self->opeer_ = soa.Decode<mirror::Object*>(self->jpeer_); 166 self->GetJniEnv()->DeleteGlobalRef(self->jpeer_); 167 self->jpeer_ = nullptr; 168 169 { 170 SirtRef<mirror::String> thread_name(self, self->GetThreadName(soa)); 171 self->SetThreadName(thread_name->ToModifiedUtf8().c_str()); 172 } 173 Dbg::PostThreadStart(self); 174 175 // Invoke the 'run' method of our java.lang.Thread. 176 mirror::Object* receiver = self->opeer_; 177 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 178 mirror::ArtMethod* m = 179 receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(soa.DecodeMethod(mid)); 180 JValue result; 181 ArgArray arg_array(nullptr, 0); 182 arg_array.Append(receiver); 183 m->Invoke(self, arg_array.GetArray(), arg_array.GetNumBytes(), &result, "V"); 184 } 185 // Detach and delete self. 186 Runtime::Current()->GetThreadList()->Unregister(self); 187 188 return nullptr; 189} 190 191Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, 192 mirror::Object* thread_peer) { 193 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 194 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 195 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 196 // to stop it from going away. 197 if (kIsDebugBuild) { 198 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 199 if (result != nullptr && !result->IsSuspended()) { 200 Locks::thread_list_lock_->AssertHeld(soa.Self()); 201 } 202 } 203 return result; 204} 205 206Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, jobject java_thread) { 207 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 208} 209 210static size_t FixStackSize(size_t stack_size) { 211 // A stack size of zero means "use the default". 212 if (stack_size == 0) { 213 stack_size = Runtime::Current()->GetDefaultStackSize(); 214 } 215 216 // Dalvik used the bionic pthread default stack size for native threads, 217 // so include that here to support apps that expect large native stacks. 218 stack_size += 1 * MB; 219 220 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 221 if (stack_size < PTHREAD_STACK_MIN) { 222 stack_size = PTHREAD_STACK_MIN; 223 } 224 225 // It's likely that callers are trying to ensure they have at least a certain amount of 226 // stack space, so we should add our reserved space on top of what they requested, rather 227 // than implicitly take it away from them. 228 stack_size += Thread::kStackOverflowReservedBytes; 229 230 // Some systems require the stack size to be a multiple of the system page size, so round up. 231 stack_size = RoundUp(stack_size, kPageSize); 232 233 return stack_size; 234} 235 236void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 237 CHECK(java_peer != nullptr); 238 Thread* self = static_cast<JNIEnvExt*>(env)->self; 239 Runtime* runtime = Runtime::Current(); 240 241 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 242 bool thread_start_during_shutdown = false; 243 { 244 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 245 if (runtime->IsShuttingDownLocked()) { 246 thread_start_during_shutdown = true; 247 } else { 248 runtime->StartThreadBirth(); 249 } 250 } 251 if (thread_start_during_shutdown) { 252 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 253 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 254 return; 255 } 256 257 Thread* child_thread = new Thread(is_daemon); 258 // Use global JNI ref to hold peer live while child thread starts. 259 child_thread->jpeer_ = env->NewGlobalRef(java_peer); 260 stack_size = FixStackSize(stack_size); 261 262 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 263 // assign it. 264 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 265 reinterpret_cast<jlong>(child_thread)); 266 267 pthread_t new_pthread; 268 pthread_attr_t attr; 269 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 270 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 271 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 272 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 273 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 274 275 if (pthread_create_result != 0) { 276 // pthread_create(3) failed, so clean up. 277 { 278 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 279 runtime->EndThreadBirth(); 280 } 281 // Manually delete the global reference since Thread::Init will not have been run. 282 env->DeleteGlobalRef(child_thread->jpeer_); 283 child_thread->jpeer_ = nullptr; 284 delete child_thread; 285 child_thread = nullptr; 286 // TODO: remove from thread group? 287 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 288 { 289 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 290 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 291 ScopedObjectAccess soa(env); 292 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 293 } 294 } 295} 296 297void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 298 // This function does all the initialization that must be run by the native thread it applies to. 299 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 300 // we can handshake with the corresponding native thread when it's ready.) Check this native 301 // thread hasn't been through here already... 302 CHECK(Thread::Current() == nullptr); 303 SetUpAlternateSignalStack(); 304 InitCpu(); 305 InitTlsEntryPoints(); 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) * 1000000LL + now.tv_nsec / 1000LL; 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 } 581} 582 583void Thread::RunCheckpointFunction() { 584 Closure *checkpoints[kMaxCheckpoints]; 585 586 // Grab the suspend_count lock and copy the current set of 587 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 588 // function will also grab this lock so we prevent a race between setting 589 // the kCheckpointRequest flag and clearing it. 590 { 591 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 592 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 593 checkpoints[i] = checkpoint_functions_[i]; 594 checkpoint_functions_[i] = nullptr; 595 } 596 AtomicClearFlag(kCheckpointRequest); 597 } 598 599 // Outside the lock, run all the checkpoint functions that 600 // we collected. 601 bool found_checkpoint = false; 602 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 603 if (checkpoints[i] != nullptr) { 604 ATRACE_BEGIN("Checkpoint function"); 605 checkpoints[i]->Run(this); 606 ATRACE_END(); 607 found_checkpoint = true; 608 } 609 } 610 CHECK(found_checkpoint); 611} 612 613bool Thread::RequestCheckpoint(Closure* function) { 614 union StateAndFlags old_state_and_flags; 615 old_state_and_flags.as_int = state_and_flags_.as_int; 616 if (old_state_and_flags.as_struct.state != kRunnable) { 617 return false; // Fail, thread is suspended and so can't run a checkpoint. 618 } 619 620 uint32_t available_checkpoint = kMaxCheckpoints; 621 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 622 if (checkpoint_functions_[i] == nullptr) { 623 available_checkpoint = i; 624 break; 625 } 626 } 627 if (available_checkpoint == kMaxCheckpoints) { 628 // No checkpoint functions available, we can't run a checkpoint 629 return false; 630 } 631 checkpoint_functions_[available_checkpoint] = function; 632 633 // Checkpoint function installed now install flag bit. 634 // We must be runnable to request a checkpoint. 635 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 636 union StateAndFlags new_state_and_flags; 637 new_state_and_flags.as_int = old_state_and_flags.as_int; 638 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 639 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 640 &state_and_flags_.as_int); 641 if (UNLIKELY(succeeded != 0)) { 642 // The thread changed state before the checkpoint was installed. 643 CHECK_EQ(checkpoint_functions_[available_checkpoint], function); 644 checkpoint_functions_[available_checkpoint] = nullptr; 645 } else { 646 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 647 } 648 return succeeded == 0; 649} 650 651void Thread::FullSuspendCheck() { 652 VLOG(threads) << this << " self-suspending"; 653 ATRACE_BEGIN("Full suspend check"); 654 // Make thread appear suspended to other threads, release mutator_lock_. 655 TransitionFromRunnableToSuspended(kSuspended); 656 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 657 TransitionFromSuspendedToRunnable(); 658 ATRACE_END(); 659 VLOG(threads) << this << " self-reviving"; 660} 661 662void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 663 std::string group_name; 664 int priority; 665 bool is_daemon = false; 666 Thread* self = Thread::Current(); 667 668 if (self != nullptr && thread != nullptr && thread->opeer_ != nullptr) { 669 ScopedObjectAccessUnchecked soa(self); 670 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)->GetInt(thread->opeer_); 671 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)->GetBoolean(thread->opeer_); 672 673 mirror::Object* thread_group = 674 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->opeer_); 675 676 if (thread_group != nullptr) { 677 mirror::ArtField* group_name_field = 678 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 679 mirror::String* group_name_string = 680 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 681 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 682 } 683 } else { 684 priority = GetNativePriority(); 685 } 686 687 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 688 if (scheduler_group_name.empty()) { 689 scheduler_group_name = "default"; 690 } 691 692 if (thread != nullptr) { 693 os << '"' << *thread->name_ << '"'; 694 if (is_daemon) { 695 os << " daemon"; 696 } 697 os << " prio=" << priority 698 << " tid=" << thread->GetThreadId() 699 << " " << thread->GetState(); 700 if (thread->IsStillStarting()) { 701 os << " (still starting up)"; 702 } 703 os << "\n"; 704 } else { 705 os << '"' << ::art::GetThreadName(tid) << '"' 706 << " prio=" << priority 707 << " (not attached)\n"; 708 } 709 710 if (thread != nullptr) { 711 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 712 os << " | group=\"" << group_name << "\"" 713 << " sCount=" << thread->suspend_count_ 714 << " dsCount=" << thread->debug_suspend_count_ 715 << " obj=" << reinterpret_cast<void*>(thread->opeer_) 716 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 717 } 718 719 os << " | sysTid=" << tid 720 << " nice=" << getpriority(PRIO_PROCESS, tid) 721 << " cgrp=" << scheduler_group_name; 722 if (thread != nullptr) { 723 int policy; 724 sched_param sp; 725 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->pthread_self_, &policy, &sp), __FUNCTION__); 726 os << " sched=" << policy << "/" << sp.sched_priority 727 << " handle=" << reinterpret_cast<void*>(thread->pthread_self_); 728 } 729 os << "\n"; 730 731 // Grab the scheduler stats for this thread. 732 std::string scheduler_stats; 733 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 734 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 735 } else { 736 scheduler_stats = "0 0 0"; 737 } 738 739 char native_thread_state = '?'; 740 int utime = 0; 741 int stime = 0; 742 int task_cpu = 0; 743 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 744 745 os << " | state=" << native_thread_state 746 << " schedstat=( " << scheduler_stats << " )" 747 << " utm=" << utime 748 << " stm=" << stime 749 << " core=" << task_cpu 750 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 751 if (thread != nullptr) { 752 os << " | stack=" << reinterpret_cast<void*>(thread->stack_begin_) << "-" << reinterpret_cast<void*>(thread->stack_end_) 753 << " stackSize=" << PrettySize(thread->stack_size_) << "\n"; 754 } 755} 756 757void Thread::DumpState(std::ostream& os) const { 758 Thread::DumpState(os, this, GetTid()); 759} 760 761struct StackDumpVisitor : public StackVisitor { 762 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 763 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 764 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 765 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 766 } 767 768 virtual ~StackDumpVisitor() { 769 if (frame_count == 0) { 770 os << " (no managed stack frames)\n"; 771 } 772 } 773 774 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 775 mirror::ArtMethod* m = GetMethod(); 776 if (m->IsRuntimeMethod()) { 777 return true; 778 } 779 const int kMaxRepetition = 3; 780 mirror::Class* c = m->GetDeclaringClass(); 781 mirror::DexCache* dex_cache = c->GetDexCache(); 782 int line_number = -1; 783 if (dex_cache != nullptr) { // be tolerant of bad input 784 const DexFile& dex_file = *dex_cache->GetDexFile(); 785 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 786 } 787 if (line_number == last_line_number && last_method == m) { 788 ++repetition_count; 789 } else { 790 if (repetition_count >= kMaxRepetition) { 791 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 792 } 793 repetition_count = 0; 794 last_line_number = line_number; 795 last_method = m; 796 } 797 if (repetition_count < kMaxRepetition) { 798 os << " at " << PrettyMethod(m, false); 799 if (m->IsNative()) { 800 os << "(Native method)"; 801 } else { 802 mh.ChangeMethod(m); 803 const char* source_file(mh.GetDeclaringClassSourceFile()); 804 os << "(" << (source_file != nullptr ? source_file : "unavailable") 805 << ":" << line_number << ")"; 806 } 807 os << "\n"; 808 if (frame_count == 0) { 809 Monitor::DescribeWait(os, thread); 810 } 811 if (can_allocate) { 812 Monitor::VisitLocks(this, DumpLockedObject, &os); 813 } 814 } 815 816 ++frame_count; 817 return true; 818 } 819 820 static void DumpLockedObject(mirror::Object* o, void* context) 821 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 822 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 823 os << " - locked <" << o << "> (a " << PrettyTypeOf(o) << ")\n"; 824 } 825 826 std::ostream& os; 827 const Thread* thread; 828 const bool can_allocate; 829 MethodHelper mh; 830 mirror::ArtMethod* last_method; 831 int last_line_number; 832 int repetition_count; 833 int frame_count; 834}; 835 836static bool ShouldShowNativeStack(const Thread* thread) 837 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 838 ThreadState state = thread->GetState(); 839 840 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 841 if (state > kWaiting && state < kStarting) { 842 return true; 843 } 844 845 // In an Object.wait variant or Thread.sleep? That's not interesting. 846 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 847 return false; 848 } 849 850 // In some other native method? That's interesting. 851 // We don't just check kNative because native methods will be in state kSuspended if they're 852 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 853 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 854 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 855 return current_method != nullptr && current_method->IsNative(); 856} 857 858void Thread::DumpStack(std::ostream& os) const { 859 // TODO: we call this code when dying but may not have suspended the thread ourself. The 860 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 861 // the race with the thread_suspend_count_lock_). 862 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 863 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 864 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 865 // If we're currently in native code, dump that stack before dumping the managed stack. 866 if (dump_for_abort || ShouldShowNativeStack(this)) { 867 DumpKernelStack(os, GetTid(), " kernel: ", false); 868 DumpNativeStack(os, GetTid(), " native: ", false); 869 } 870 UniquePtr<Context> context(Context::Create()); 871 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), !throwing_OutOfMemoryError_); 872 dumper.WalkStack(); 873 } else { 874 os << "Not able to dump stack of thread that isn't suspended"; 875 } 876} 877 878void Thread::ThreadExitCallback(void* arg) { 879 Thread* self = reinterpret_cast<Thread*>(arg); 880 if (self->thread_exit_check_count_ == 0) { 881 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's going to use a pthread_key_create destructor?): " << *self; 882 CHECK(is_started_); 883 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 884 self->thread_exit_check_count_ = 1; 885 } else { 886 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 887 } 888} 889 890void Thread::Startup() { 891 CHECK(!is_started_); 892 is_started_ = true; 893 { 894 // MutexLock to keep annotalysis happy. 895 // 896 // Note we use nullptr for the thread because Thread::Current can 897 // return garbage since (is_started_ == true) and 898 // Thread::pthread_key_self_ is not yet initialized. 899 // This was seen on glibc. 900 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 901 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 902 *Locks::thread_suspend_count_lock_); 903 } 904 905 // Allocate a TLS slot. 906 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 907 908 // Double-check the TLS slot allocation. 909 if (pthread_getspecific(pthread_key_self_) != nullptr) { 910 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 911 } 912} 913 914void Thread::FinishStartup() { 915 Runtime* runtime = Runtime::Current(); 916 CHECK(runtime->IsStarted()); 917 918 // Finish attaching the main thread. 919 ScopedObjectAccess soa(Thread::Current()); 920 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 921 922 Runtime::Current()->GetClassLinker()->RunRootClinits(); 923} 924 925void Thread::Shutdown() { 926 CHECK(is_started_); 927 is_started_ = false; 928 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 929 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 930 if (resume_cond_ != nullptr) { 931 delete resume_cond_; 932 resume_cond_ = nullptr; 933 } 934} 935 936Thread::Thread(bool daemon) 937 : suspend_count_(0), 938 card_table_(nullptr), 939 exception_(nullptr), 940 stack_end_(nullptr), 941 managed_stack_(), 942 jni_env_(nullptr), 943 self_(nullptr), 944 opeer_(nullptr), 945 jpeer_(nullptr), 946 stack_begin_(nullptr), 947 stack_size_(0), 948 thin_lock_thread_id_(0), 949 stack_trace_sample_(nullptr), 950 trace_clock_base_(0), 951 tid_(0), 952 wait_mutex_(new Mutex("a thread wait mutex")), 953 wait_cond_(new ConditionVariable("a thread wait condition variable", *wait_mutex_)), 954 wait_monitor_(nullptr), 955 interrupted_(false), 956 wait_next_(nullptr), 957 monitor_enter_object_(nullptr), 958 top_sirt_(nullptr), 959 runtime_(nullptr), 960 class_loader_override_(nullptr), 961 long_jump_context_(nullptr), 962 throwing_OutOfMemoryError_(false), 963 debug_suspend_count_(0), 964 debug_invoke_req_(new DebugInvokeReq), 965 single_step_control_(new SingleStepControl), 966 deoptimization_shadow_frame_(nullptr), 967 instrumentation_stack_(new std::deque<instrumentation::InstrumentationStackFrame>), 968 name_(new std::string(kThreadNameDuringStartup)), 969 daemon_(daemon), 970 pthread_self_(0), 971 no_thread_suspension_(0), 972 last_no_thread_suspension_cause_(nullptr), 973 thread_exit_check_count_(0), 974 thread_local_start_(nullptr), 975 thread_local_pos_(nullptr), 976 thread_local_end_(nullptr), 977 thread_local_objects_(0), 978 thread_local_alloc_stack_top_(nullptr), 979 thread_local_alloc_stack_end_(nullptr) { 980 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 981 state_and_flags_.as_struct.flags = 0; 982 state_and_flags_.as_struct.state = kNative; 983 memset(&held_mutexes_[0], 0, sizeof(held_mutexes_)); 984 memset(rosalloc_runs_, 0, sizeof(rosalloc_runs_)); 985 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 986 checkpoint_functions_[i] = nullptr; 987 } 988} 989 990bool Thread::IsStillStarting() const { 991 // You might think you can check whether the state is kStarting, but for much of thread startup, 992 // the thread is in kNative; it might also be in kVmWait. 993 // You might think you can check whether the peer is nullptr, but the peer is actually created and 994 // assigned fairly early on, and needs to be. 995 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 996 // this thread _ever_ entered kRunnable". 997 return (jpeer_ == nullptr && opeer_ == nullptr) || (*name_ == kThreadNameDuringStartup); 998} 999 1000void Thread::AssertNoPendingException() const { 1001 if (UNLIKELY(IsExceptionPending())) { 1002 ScopedObjectAccess soa(Thread::Current()); 1003 mirror::Throwable* exception = GetException(nullptr); 1004 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1005 } 1006} 1007 1008static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1009 RootType /*root_type*/) 1010 NO_THREAD_SAFETY_ANALYSIS { 1011 Thread* self = reinterpret_cast<Thread*>(arg); 1012 mirror::Object* entered_monitor = *object; 1013 if (self->HoldsLock(entered_monitor)) { 1014 LOG(WARNING) << "Calling MonitorExit on object " 1015 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1016 << " left locked by native thread " 1017 << *Thread::Current() << " which is detaching"; 1018 entered_monitor->MonitorExit(self); 1019 } 1020} 1021 1022void Thread::Destroy() { 1023 Thread* self = this; 1024 DCHECK_EQ(self, Thread::Current()); 1025 1026 if (opeer_ != nullptr) { 1027 ScopedObjectAccess soa(self); 1028 // We may need to call user-supplied managed code, do this before final clean-up. 1029 HandleUncaughtExceptions(soa); 1030 RemoveFromThreadGroup(soa); 1031 1032 // this.nativePeer = 0; 1033 if (Runtime::Current()->IsActiveTransaction()) { 1034 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong<true>(opeer_, 0); 1035 } else { 1036 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong<false>(opeer_, 0); 1037 } 1038 Dbg::PostThreadDeath(self); 1039 1040 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1041 // who is waiting. 1042 mirror::Object* lock = 1043 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 1044 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1045 if (lock != nullptr) { 1046 SirtRef<mirror::Object> sirt_obj(self, lock); 1047 ObjectLock<mirror::Object> locker(self, &sirt_obj); 1048 locker.Notify(); 1049 } 1050 } 1051 1052 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1053 if (jni_env_ != nullptr) { 1054 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1055 } 1056} 1057 1058Thread::~Thread() { 1059 if (jni_env_ != nullptr && jpeer_ != nullptr) { 1060 // If pthread_create fails we don't have a jni env here. 1061 jni_env_->DeleteGlobalRef(jpeer_); 1062 jpeer_ = nullptr; 1063 } 1064 opeer_ = nullptr; 1065 1066 bool initialized = (jni_env_ != nullptr); // Did Thread::Init run? 1067 if (initialized) { 1068 delete jni_env_; 1069 jni_env_ = nullptr; 1070 } 1071 CHECK_NE(GetState(), kRunnable); 1072 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1073 CHECK(checkpoint_functions_[0] == nullptr); 1074 CHECK(checkpoint_functions_[1] == nullptr); 1075 CHECK(checkpoint_functions_[2] == nullptr); 1076 1077 // We may be deleting a still born thread. 1078 SetStateUnsafe(kTerminated); 1079 1080 delete wait_cond_; 1081 delete wait_mutex_; 1082 1083 if (long_jump_context_ != nullptr) { 1084 delete long_jump_context_; 1085 } 1086 1087 if (initialized) { 1088 CleanupCpu(); 1089 } 1090 1091 delete debug_invoke_req_; 1092 delete single_step_control_; 1093 delete instrumentation_stack_; 1094 delete name_; 1095 delete stack_trace_sample_; 1096 1097 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1098 1099 TearDownAlternateSignalStack(); 1100} 1101 1102void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1103 if (!IsExceptionPending()) { 1104 return; 1105 } 1106 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1107 ScopedThreadStateChange tsc(this, kNative); 1108 1109 // Get and clear the exception. 1110 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1111 jni_env_->ExceptionClear(); 1112 1113 // If the thread has its own handler, use that. 1114 ScopedLocalRef<jobject> handler(jni_env_, 1115 jni_env_->GetObjectField(peer.get(), 1116 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1117 if (handler.get() == nullptr) { 1118 // Otherwise use the thread group's default handler. 1119 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1120 } 1121 1122 // Call the handler. 1123 jni_env_->CallVoidMethod(handler.get(), 1124 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1125 peer.get(), exception.get()); 1126 1127 // If the handler threw, clear that exception too. 1128 jni_env_->ExceptionClear(); 1129} 1130 1131void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1132 // this.group.removeThread(this); 1133 // group can be null if we're in the compiler or a test. 1134 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1135 if (ogroup != nullptr) { 1136 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1137 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1138 ScopedThreadStateChange tsc(soa.Self(), kNative); 1139 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1140 peer.get()); 1141 } 1142} 1143 1144size_t Thread::NumSirtReferences() { 1145 size_t count = 0; 1146 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1147 count += cur->NumberOfReferences(); 1148 } 1149 return count; 1150} 1151 1152bool Thread::SirtContains(jobject obj) const { 1153 StackReference<mirror::Object>* sirt_entry = 1154 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1155 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1156 if (cur->Contains(sirt_entry)) { 1157 return true; 1158 } 1159 } 1160 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1161 return managed_stack_.ShadowFramesContain(sirt_entry); 1162} 1163 1164void Thread::SirtVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1165 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1166 size_t num_refs = cur->NumberOfReferences(); 1167 for (size_t j = 0; j < num_refs; ++j) { 1168 mirror::Object* object = cur->GetReference(j); 1169 if (object != nullptr) { 1170 mirror::Object* old_obj = object; 1171 visitor(&object, arg, thread_id, kRootNativeStack); 1172 if (old_obj != object) { 1173 cur->SetReference(j, object); 1174 } 1175 } 1176 } 1177 } 1178} 1179 1180mirror::Object* Thread::DecodeJObject(jobject obj) const { 1181 Locks::mutator_lock_->AssertSharedHeld(this); 1182 if (obj == nullptr) { 1183 return nullptr; 1184 } 1185 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1186 IndirectRefKind kind = GetIndirectRefKind(ref); 1187 mirror::Object* result; 1188 // The "kinds" below are sorted by the frequency we expect to encounter them. 1189 if (kind == kLocal) { 1190 IndirectReferenceTable& locals = jni_env_->locals; 1191 result = const_cast<mirror::Object*>(locals.Get(ref)); 1192 } else if (kind == kSirtOrInvalid) { 1193 // TODO: make stack indirect reference table lookup more efficient. 1194 // Check if this is a local reference in the SIRT. 1195 if (LIKELY(SirtContains(obj))) { 1196 // Read from SIRT. 1197 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1198 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1199 // Assume an invalid local reference is actually a direct pointer. 1200 result = reinterpret_cast<mirror::Object*>(obj); 1201 } else { 1202 result = kInvalidIndirectRefObject; 1203 } 1204 } else if (kind == kGlobal) { 1205 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1206 IndirectReferenceTable& globals = vm->globals; 1207 ReaderMutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1208 result = const_cast<mirror::Object*>(globals.Get(ref)); 1209 } else { 1210 DCHECK_EQ(kind, kWeakGlobal); 1211 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1212 if (result == kClearedJniWeakGlobal) { 1213 // This is a special case where it's okay to return nullptr. 1214 return nullptr; 1215 } 1216 } 1217 1218 if (UNLIKELY(result == nullptr)) { 1219 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1220 } else { 1221 if (result != kInvalidIndirectRefObject) { 1222 VerifyObject(result); 1223 } 1224 } 1225 return result; 1226} 1227 1228// Implements java.lang.Thread.interrupted. 1229bool Thread::Interrupted() { 1230 MutexLock mu(Thread::Current(), *wait_mutex_); 1231 bool interrupted = interrupted_; 1232 interrupted_ = false; 1233 return interrupted; 1234} 1235 1236// Implements java.lang.Thread.isInterrupted. 1237bool Thread::IsInterrupted() { 1238 MutexLock mu(Thread::Current(), *wait_mutex_); 1239 return interrupted_; 1240} 1241 1242void Thread::Interrupt() { 1243 Thread* self = Thread::Current(); 1244 MutexLock mu(self, *wait_mutex_); 1245 if (interrupted_) { 1246 return; 1247 } 1248 interrupted_ = true; 1249 NotifyLocked(self); 1250} 1251 1252void Thread::Notify() { 1253 Thread* self = Thread::Current(); 1254 MutexLock mu(self, *wait_mutex_); 1255 NotifyLocked(self); 1256} 1257 1258void Thread::NotifyLocked(Thread* self) { 1259 if (wait_monitor_ != nullptr) { 1260 wait_cond_->Signal(self); 1261 } 1262} 1263 1264class CountStackDepthVisitor : public StackVisitor { 1265 public: 1266 explicit CountStackDepthVisitor(Thread* thread) 1267 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1268 : StackVisitor(thread, nullptr), 1269 depth_(0), skip_depth_(0), skipping_(true) {} 1270 1271 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1272 // We want to skip frames up to and including the exception's constructor. 1273 // Note we also skip the frame if it doesn't have a method (namely the callee 1274 // save frame) 1275 mirror::ArtMethod* m = GetMethod(); 1276 if (skipping_ && !m->IsRuntimeMethod() && 1277 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1278 skipping_ = false; 1279 } 1280 if (!skipping_) { 1281 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1282 ++depth_; 1283 } 1284 } else { 1285 ++skip_depth_; 1286 } 1287 return true; 1288 } 1289 1290 int GetDepth() const { 1291 return depth_; 1292 } 1293 1294 int GetSkipDepth() const { 1295 return skip_depth_; 1296 } 1297 1298 private: 1299 uint32_t depth_; 1300 uint32_t skip_depth_; 1301 bool skipping_; 1302}; 1303 1304class BuildInternalStackTraceVisitor : public StackVisitor { 1305 public: 1306 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1307 : StackVisitor(thread, nullptr), self_(self), 1308 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1309 1310 bool Init(int depth) 1311 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1312 // Allocate method trace with an extra slot that will hold the PC trace 1313 SirtRef<mirror::ObjectArray<mirror::Object> > 1314 method_trace(self_, 1315 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1316 depth + 1)); 1317 if (method_trace.get() == nullptr) { 1318 return false; 1319 } 1320 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1321 if (dex_pc_trace == nullptr) { 1322 return false; 1323 } 1324 // Save PC trace in last element of method trace, also places it into the 1325 // object graph. 1326 // We are called from native: use non-transactional mode. 1327 method_trace->Set<false>(depth, dex_pc_trace); 1328 // Set the Object*s and assert that no thread suspension is now possible. 1329 const char* last_no_suspend_cause = 1330 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1331 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1332 method_trace_ = method_trace.get(); 1333 dex_pc_trace_ = dex_pc_trace; 1334 return true; 1335 } 1336 1337 virtual ~BuildInternalStackTraceVisitor() { 1338 if (method_trace_ != nullptr) { 1339 self_->EndAssertNoThreadSuspension(nullptr); 1340 } 1341 } 1342 1343 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1344 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1345 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1346 } 1347 if (skip_depth_ > 0) { 1348 skip_depth_--; 1349 return true; 1350 } 1351 mirror::ArtMethod* m = GetMethod(); 1352 if (m->IsRuntimeMethod()) { 1353 return true; // Ignore runtime frames (in particular callee save). 1354 } 1355 // TODO dedup this code. 1356 if (Runtime::Current()->IsActiveTransaction()) { 1357 method_trace_->Set<true>(count_, m); 1358 dex_pc_trace_->Set<true>(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1359 } else { 1360 method_trace_->Set<false>(count_, m); 1361 dex_pc_trace_->Set<false>(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1362 } 1363 ++count_; 1364 return true; 1365 } 1366 1367 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1368 return method_trace_; 1369 } 1370 1371 private: 1372 Thread* const self_; 1373 // How many more frames to skip. 1374 int32_t skip_depth_; 1375 // Current position down stack trace. 1376 uint32_t count_; 1377 // Array of dex PC values. 1378 mirror::IntArray* dex_pc_trace_; 1379 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1380 mirror::ObjectArray<mirror::Object>* method_trace_; 1381}; 1382 1383jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1384 // Compute depth of stack 1385 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1386 count_visitor.WalkStack(); 1387 int32_t depth = count_visitor.GetDepth(); 1388 int32_t skip_depth = count_visitor.GetSkipDepth(); 1389 1390 // Build internal stack trace. 1391 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1392 skip_depth); 1393 if (!build_trace_visitor.Init(depth)) { 1394 return nullptr; // Allocation failed. 1395 } 1396 build_trace_visitor.WalkStack(); 1397 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1398 if (kIsDebugBuild) { 1399 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1400 CHECK(trace->Get(i) != nullptr); 1401 } 1402 } 1403 return soa.AddLocalReference<jobjectArray>(trace); 1404} 1405 1406jobjectArray Thread::InternalStackTraceToStackTraceElementArray(JNIEnv* env, jobject internal, 1407 jobjectArray output_array, int* stack_depth) { 1408 // Transition into runnable state to work on Object*/Array* 1409 ScopedObjectAccess soa(env); 1410 // Decode the internal stack trace into the depth, method trace and PC trace 1411 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1412 1413 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1414 1415 jobjectArray result; 1416 1417 if (output_array != nullptr) { 1418 // Reuse the array we were given. 1419 result = output_array; 1420 // ...adjusting the number of frames we'll write to not exceed the array length. 1421 const int32_t traces_length = 1422 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1423 depth = std::min(depth, traces_length); 1424 } else { 1425 // Create java_trace array and place in local reference table 1426 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1427 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1428 if (java_traces == nullptr) { 1429 return nullptr; 1430 } 1431 result = soa.AddLocalReference<jobjectArray>(java_traces); 1432 } 1433 1434 if (stack_depth != nullptr) { 1435 *stack_depth = depth; 1436 } 1437 1438 for (int32_t i = 0; i < depth; ++i) { 1439 mirror::ObjectArray<mirror::Object>* method_trace = 1440 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1441 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1442 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1443 MethodHelper mh(method); 1444 int32_t line_number; 1445 SirtRef<mirror::String> class_name_object(soa.Self(), nullptr); 1446 SirtRef<mirror::String> source_name_object(soa.Self(), nullptr); 1447 if (method->IsProxyMethod()) { 1448 line_number = -1; 1449 class_name_object.reset(method->GetDeclaringClass()->GetName()); 1450 // source_name_object intentionally left null for proxy methods 1451 } else { 1452 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1453 uint32_t dex_pc = pc_trace->Get(i); 1454 line_number = mh.GetLineNumFromDexPC(dex_pc); 1455 // Allocate element, potentially triggering GC 1456 // TODO: reuse class_name_object via Class::name_? 1457 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1458 CHECK(descriptor != nullptr); 1459 std::string class_name(PrettyDescriptor(descriptor)); 1460 class_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1461 if (class_name_object.get() == nullptr) { 1462 return nullptr; 1463 } 1464 const char* source_file = mh.GetDeclaringClassSourceFile(); 1465 if (source_file != nullptr) { 1466 source_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1467 if (source_name_object.get() == nullptr) { 1468 return nullptr; 1469 } 1470 } 1471 } 1472 const char* method_name = mh.GetName(); 1473 CHECK(method_name != nullptr); 1474 SirtRef<mirror::String> method_name_object(soa.Self(), 1475 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1476 method_name)); 1477 if (method_name_object.get() == nullptr) { 1478 return nullptr; 1479 } 1480 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1481 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1482 if (obj == nullptr) { 1483 return nullptr; 1484 } 1485 // We are called from native: use non-transactional mode. 1486 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1487 } 1488 return result; 1489} 1490 1491void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1492 const char* exception_class_descriptor, const char* fmt, ...) { 1493 va_list args; 1494 va_start(args, fmt); 1495 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1496 fmt, args); 1497 va_end(args); 1498} 1499 1500void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1501 const char* exception_class_descriptor, 1502 const char* fmt, va_list ap) { 1503 std::string msg; 1504 StringAppendV(&msg, fmt, ap); 1505 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1506} 1507 1508void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1509 const char* msg) { 1510 AssertNoPendingException(); // Callers should either clear or call ThrowNewWrappedException. 1511 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1512} 1513 1514void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1515 const char* exception_class_descriptor, 1516 const char* msg) { 1517 DCHECK_EQ(this, Thread::Current()); 1518 // Ensure we don't forget arguments over object allocation. 1519 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1520 SirtRef<mirror::ArtMethod> saved_throw_method(this, throw_location.GetMethod()); 1521 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1522 SirtRef<mirror::Throwable> cause(this, GetException(nullptr)); 1523 ClearException(); 1524 Runtime* runtime = Runtime::Current(); 1525 1526 mirror::ClassLoader* cl = nullptr; 1527 if (saved_throw_method.get() != nullptr) { 1528 cl = saved_throw_method.get()->GetDeclaringClass()->GetClassLoader(); 1529 } 1530 SirtRef<mirror::ClassLoader> class_loader(this, cl); 1531 SirtRef<mirror::Class> 1532 exception_class(this, runtime->GetClassLinker()->FindClass(exception_class_descriptor, 1533 class_loader)); 1534 if (UNLIKELY(exception_class.get() == nullptr)) { 1535 CHECK(IsExceptionPending()); 1536 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1537 return; 1538 } 1539 1540 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1541 DCHECK(IsExceptionPending()); 1542 return; 1543 } 1544 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1545 SirtRef<mirror::Throwable> exception(this, 1546 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1547 1548 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1549 if (exception.get() == nullptr) { 1550 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1551 throw_location.GetDexPc()); 1552 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1553 return; 1554 } 1555 1556 // Choose an appropriate constructor and set up the arguments. 1557 const char* signature; 1558 const char* shorty; 1559 SirtRef<mirror::String> msg_string(this, nullptr); 1560 if (msg != nullptr) { 1561 // Ensure we remember this and the method over the String allocation. 1562 msg_string.reset(mirror::String::AllocFromModifiedUtf8(this, msg)); 1563 if (UNLIKELY(msg_string.get() == nullptr)) { 1564 CHECK(IsExceptionPending()); // OOME. 1565 return; 1566 } 1567 if (cause.get() == nullptr) { 1568 shorty = "VL"; 1569 signature = "(Ljava/lang/String;)V"; 1570 } else { 1571 shorty = "VLL"; 1572 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1573 } 1574 } else { 1575 if (cause.get() == nullptr) { 1576 shorty = "V"; 1577 signature = "()V"; 1578 } else { 1579 shorty = "VL"; 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(msg_string.get()); 1595 } 1596 if (cause.get() != nullptr) { 1597 exception->SetCause(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 ArgArray args(shorty, strlen(shorty)); 1604 args.Append(exception.get()); 1605 if (msg != nullptr) { 1606 args.Append(msg_string.get()); 1607 } 1608 if (cause.get() != nullptr) { 1609 args.Append(cause.get()); 1610 } 1611 JValue result; 1612 exception_init_method->Invoke(this, args.GetArray(), args.GetNumBytes(), &result, shorty); 1613 if (LIKELY(!IsExceptionPending())) { 1614 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1615 throw_location.GetDexPc()); 1616 SetException(gc_safe_throw_location, exception.get()); 1617 } 1618 } 1619} 1620 1621void Thread::ThrowOutOfMemoryError(const char* msg) { 1622 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1623 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1624 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1625 if (!throwing_OutOfMemoryError_) { 1626 throwing_OutOfMemoryError_ = true; 1627 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1628 throwing_OutOfMemoryError_ = false; 1629 } else { 1630 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1631 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1632 } 1633} 1634 1635Thread* Thread::CurrentFromGdb() { 1636 return Thread::Current(); 1637} 1638 1639void Thread::DumpFromGdb() const { 1640 std::ostringstream ss; 1641 Dump(ss); 1642 std::string str(ss.str()); 1643 // log to stderr for debugging command line processes 1644 std::cerr << str; 1645#ifdef HAVE_ANDROID_OS 1646 // log to logcat for debugging frameworks processes 1647 LOG(INFO) << str; 1648#endif 1649} 1650 1651struct EntryPointInfo { 1652 uint32_t offset; 1653 const char* name; 1654}; 1655#define INTERPRETER_ENTRY_POINT_INFO(x) { INTERPRETER_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1656#define JNI_ENTRY_POINT_INFO(x) { JNI_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1657#define PORTABLE_ENTRY_POINT_INFO(x) { PORTABLE_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1658#define QUICK_ENTRY_POINT_INFO(x) { QUICK_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1659static const EntryPointInfo gThreadEntryPointInfo[] = { 1660 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge), 1661 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge), 1662 JNI_ENTRY_POINT_INFO(pDlsymLookup), 1663 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline), 1664 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline), 1665 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge), 1666 QUICK_ENTRY_POINT_INFO(pAllocArray), 1667 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved), 1668 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck), 1669 QUICK_ENTRY_POINT_INFO(pAllocObject), 1670 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved), 1671 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized), 1672 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck), 1673 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray), 1674 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck), 1675 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial), 1676 QUICK_ENTRY_POINT_INFO(pCheckCast), 1677 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage), 1678 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess), 1679 QUICK_ENTRY_POINT_INFO(pInitializeType), 1680 QUICK_ENTRY_POINT_INFO(pResolveString), 1681 QUICK_ENTRY_POINT_INFO(pSet32Instance), 1682 QUICK_ENTRY_POINT_INFO(pSet32Static), 1683 QUICK_ENTRY_POINT_INFO(pSet64Instance), 1684 QUICK_ENTRY_POINT_INFO(pSet64Static), 1685 QUICK_ENTRY_POINT_INFO(pSetObjInstance), 1686 QUICK_ENTRY_POINT_INFO(pSetObjStatic), 1687 QUICK_ENTRY_POINT_INFO(pGet32Instance), 1688 QUICK_ENTRY_POINT_INFO(pGet32Static), 1689 QUICK_ENTRY_POINT_INFO(pGet64Instance), 1690 QUICK_ENTRY_POINT_INFO(pGet64Static), 1691 QUICK_ENTRY_POINT_INFO(pGetObjInstance), 1692 QUICK_ENTRY_POINT_INFO(pGetObjStatic), 1693 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck), 1694 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck), 1695 QUICK_ENTRY_POINT_INFO(pAputObject), 1696 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData), 1697 QUICK_ENTRY_POINT_INFO(pJniMethodStart), 1698 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1699 QUICK_ENTRY_POINT_INFO(pJniMethodEnd), 1700 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1701 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference), 1702 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1703 QUICK_ENTRY_POINT_INFO(pLockObject), 1704 QUICK_ENTRY_POINT_INFO(pUnlockObject), 1705 QUICK_ENTRY_POINT_INFO(pCmpgDouble), 1706 QUICK_ENTRY_POINT_INFO(pCmpgFloat), 1707 QUICK_ENTRY_POINT_INFO(pCmplDouble), 1708 QUICK_ENTRY_POINT_INFO(pCmplFloat), 1709 QUICK_ENTRY_POINT_INFO(pFmod), 1710 QUICK_ENTRY_POINT_INFO(pSqrt), 1711 QUICK_ENTRY_POINT_INFO(pL2d), 1712 QUICK_ENTRY_POINT_INFO(pFmodf), 1713 QUICK_ENTRY_POINT_INFO(pL2f), 1714 QUICK_ENTRY_POINT_INFO(pD2iz), 1715 QUICK_ENTRY_POINT_INFO(pF2iz), 1716 QUICK_ENTRY_POINT_INFO(pIdivmod), 1717 QUICK_ENTRY_POINT_INFO(pD2l), 1718 QUICK_ENTRY_POINT_INFO(pF2l), 1719 QUICK_ENTRY_POINT_INFO(pLdiv), 1720 QUICK_ENTRY_POINT_INFO(pLmod), 1721 QUICK_ENTRY_POINT_INFO(pLmul), 1722 QUICK_ENTRY_POINT_INFO(pShlLong), 1723 QUICK_ENTRY_POINT_INFO(pShrLong), 1724 QUICK_ENTRY_POINT_INFO(pUshrLong), 1725 QUICK_ENTRY_POINT_INFO(pIndexOf), 1726 QUICK_ENTRY_POINT_INFO(pMemcmp16), 1727 QUICK_ENTRY_POINT_INFO(pStringCompareTo), 1728 QUICK_ENTRY_POINT_INFO(pMemcpy), 1729 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline), 1730 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline), 1731 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge), 1732 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1733 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1734 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1735 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1736 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1737 QUICK_ENTRY_POINT_INFO(pCheckSuspend), 1738 QUICK_ENTRY_POINT_INFO(pTestSuspend), 1739 QUICK_ENTRY_POINT_INFO(pDeliverException), 1740 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds), 1741 QUICK_ENTRY_POINT_INFO(pThrowDivZero), 1742 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod), 1743 QUICK_ENTRY_POINT_INFO(pThrowNullPointer), 1744 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow), 1745}; 1746#undef QUICK_ENTRY_POINT_INFO 1747 1748void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1749 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1750 1751#define DO_THREAD_OFFSET(x) \ 1752 if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { \ 1753 os << # x; \ 1754 return; \ 1755 } 1756 DO_THREAD_OFFSET(state_and_flags_); 1757 DO_THREAD_OFFSET(card_table_); 1758 DO_THREAD_OFFSET(exception_); 1759 DO_THREAD_OFFSET(opeer_); 1760 DO_THREAD_OFFSET(jni_env_); 1761 DO_THREAD_OFFSET(self_); 1762 DO_THREAD_OFFSET(stack_end_); 1763 DO_THREAD_OFFSET(suspend_count_); 1764 DO_THREAD_OFFSET(thin_lock_thread_id_); 1765 // DO_THREAD_OFFSET(top_of_managed_stack_); 1766 // DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1767 DO_THREAD_OFFSET(top_sirt_); 1768#undef DO_THREAD_OFFSET 1769 1770 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1771 CHECK_EQ(entry_point_count * size_of_pointers, 1772 sizeof(InterpreterEntryPoints) + sizeof(JniEntryPoints) + sizeof(PortableEntryPoints) + 1773 sizeof(QuickEntryPoints)); 1774 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, interpreter_entrypoints_); 1775 for (size_t i = 0; i < entry_point_count; ++i) { 1776 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1777 expected_offset += size_of_pointers; 1778 if (gThreadEntryPointInfo[i].offset == offset) { 1779 os << gThreadEntryPointInfo[i].name; 1780 return; 1781 } 1782 } 1783 os << offset; 1784} 1785 1786void Thread::QuickDeliverException() { 1787 // Get exception from thread. 1788 ThrowLocation throw_location; 1789 mirror::Throwable* exception = GetException(&throw_location); 1790 CHECK(exception != nullptr); 1791 // Don't leave exception visible while we try to find the handler, which may cause class 1792 // resolution. 1793 ClearException(); 1794 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1795 if (kDebugExceptionDelivery) { 1796 if (!is_deoptimization) { 1797 mirror::String* msg = exception->GetDetailMessage(); 1798 std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : ""); 1799 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1800 << ": " << str_msg << "\n"); 1801 } else { 1802 DumpStack(LOG(INFO) << "Deoptimizing: "); 1803 } 1804 } 1805 CatchFinder catch_finder(this, throw_location, exception, is_deoptimization); 1806 catch_finder.FindCatch(); 1807 catch_finder.UpdateInstrumentationStack(); 1808 catch_finder.DoLongJump(); 1809 LOG(FATAL) << "UNREACHABLE"; 1810} 1811 1812Context* Thread::GetLongJumpContext() { 1813 Context* result = long_jump_context_; 1814 if (result == nullptr) { 1815 result = Context::Create(); 1816 } else { 1817 long_jump_context_ = nullptr; // Avoid context being shared. 1818 result->Reset(); 1819 } 1820 return result; 1821} 1822 1823struct CurrentMethodVisitor : public StackVisitor { 1824 CurrentMethodVisitor(Thread* thread, Context* context) 1825 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1826 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1827 virtual bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1828 mirror::ArtMethod* m = GetMethod(); 1829 if (m->IsRuntimeMethod()) { 1830 // Continue if this is a runtime method. 1831 return true; 1832 } 1833 if (context_ != nullptr) { 1834 this_object_ = GetThisObject(); 1835 } 1836 method_ = m; 1837 dex_pc_ = GetDexPc(); 1838 return false; 1839 } 1840 mirror::Object* this_object_; 1841 mirror::ArtMethod* method_; 1842 uint32_t dex_pc_; 1843}; 1844 1845mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1846 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1847 visitor.WalkStack(false); 1848 if (dex_pc != nullptr) { 1849 *dex_pc = visitor.dex_pc_; 1850 } 1851 return visitor.method_; 1852} 1853 1854ThrowLocation Thread::GetCurrentLocationForThrow() { 1855 Context* context = GetLongJumpContext(); 1856 CurrentMethodVisitor visitor(this, context); 1857 visitor.WalkStack(false); 1858 ReleaseLongJumpContext(context); 1859 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1860} 1861 1862bool Thread::HoldsLock(mirror::Object* object) { 1863 if (object == nullptr) { 1864 return false; 1865 } 1866 return object->GetLockOwnerThreadId() == thin_lock_thread_id_; 1867} 1868 1869// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1870template <typename RootVisitor> 1871class ReferenceMapVisitor : public StackVisitor { 1872 public: 1873 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1874 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1875 : StackVisitor(thread, context), visitor_(visitor) {} 1876 1877 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1878 if (false) { 1879 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1880 << StringPrintf("@ PC:%04x", GetDexPc()); 1881 } 1882 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1883 if (shadow_frame != nullptr) { 1884 mirror::ArtMethod* m = shadow_frame->GetMethod(); 1885 size_t num_regs = shadow_frame->NumberOfVRegs(); 1886 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1887 // SIRT for JNI or References for interpreter. 1888 for (size_t reg = 0; reg < num_regs; ++reg) { 1889 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1890 if (ref != nullptr) { 1891 mirror::Object* new_ref = ref; 1892 visitor_(&new_ref, reg, this); 1893 if (new_ref != ref) { 1894 shadow_frame->SetVRegReference(reg, new_ref); 1895 } 1896 } 1897 } 1898 } else { 1899 // Java method. 1900 // Portable path use DexGcMap and store in Method.native_gc_map_. 1901 const uint8_t* gc_map = m->GetNativeGcMap(); 1902 CHECK(gc_map != nullptr) << PrettyMethod(m); 1903 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 1904 uint32_t dex_pc = GetDexPc(); 1905 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 1906 DCHECK(reg_bitmap != nullptr); 1907 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 1908 for (size_t reg = 0; reg < num_regs; ++reg) { 1909 if (TestBitmap(reg, reg_bitmap)) { 1910 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1911 if (ref != nullptr) { 1912 mirror::Object* new_ref = ref; 1913 visitor_(&new_ref, reg, this); 1914 if (new_ref != ref) { 1915 shadow_frame->SetVRegReference(reg, new_ref); 1916 } 1917 } 1918 } 1919 } 1920 } 1921 } else { 1922 mirror::ArtMethod* m = GetMethod(); 1923 // Process register map (which native and runtime methods don't have) 1924 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 1925 const uint8_t* native_gc_map = m->GetNativeGcMap(); 1926 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 1927 mh_.ChangeMethod(m); 1928 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 1929 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 1930 NativePcOffsetToReferenceMap map(native_gc_map); 1931 size_t num_regs = std::min(map.RegWidth() * 8, 1932 static_cast<size_t>(code_item->registers_size_)); 1933 if (num_regs > 0) { 1934 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 1935 DCHECK(reg_bitmap != nullptr); 1936 const VmapTable vmap_table(m->GetVmapTable()); 1937 uint32_t core_spills = m->GetCoreSpillMask(); 1938 uint32_t fp_spills = m->GetFpSpillMask(); 1939 size_t frame_size = m->GetFrameSizeInBytes(); 1940 // For all dex registers in the bitmap 1941 mirror::ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 1942 DCHECK(cur_quick_frame != nullptr); 1943 for (size_t reg = 0; reg < num_regs; ++reg) { 1944 // Does this register hold a reference? 1945 if (TestBitmap(reg, reg_bitmap)) { 1946 uint32_t vmap_offset; 1947 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 1948 int vmap_reg = vmap_table.ComputeRegister(core_spills, vmap_offset, kReferenceVReg); 1949 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 1950 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 1951 if (*ref_addr != nullptr) { 1952 visitor_(ref_addr, reg, this); 1953 } 1954 } else { 1955 StackReference<mirror::Object>* ref_addr = 1956 reinterpret_cast<StackReference<mirror::Object>*>( 1957 GetVRegAddr(cur_quick_frame, code_item, core_spills, fp_spills, frame_size, 1958 reg)); 1959 mirror::Object* ref = ref_addr->AsMirrorPtr(); 1960 if (ref != nullptr) { 1961 mirror::Object* new_ref = ref; 1962 visitor_(&new_ref, reg, this); 1963 if (ref != new_ref) { 1964 ref_addr->Assign(new_ref); 1965 } 1966 } 1967 } 1968 } 1969 } 1970 } 1971 } 1972 } 1973 return true; 1974 } 1975 1976 private: 1977 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 1978 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 1979 } 1980 1981 // Visitor for when we visit a root. 1982 const RootVisitor& visitor_; 1983 1984 // A method helper we keep around to avoid dex file/cache re-computations. 1985 MethodHelper mh_; 1986}; 1987 1988class RootCallbackVisitor { 1989 public: 1990 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 1991 : callback_(callback), arg_(arg), tid_(tid) {} 1992 1993 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 1994 callback_(obj, arg_, tid_, kRootJavaFrame); 1995 } 1996 1997 private: 1998 RootCallback* const callback_; 1999 void* const arg_; 2000 const uint32_t tid_; 2001}; 2002 2003void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2004 VerifyObject(class_loader_override); 2005 class_loader_override_ = class_loader_override; 2006} 2007 2008void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2009 uint32_t thread_id = GetThreadId(); 2010 if (opeer_ != nullptr) { 2011 visitor(&opeer_, arg, thread_id, kRootThreadObject); 2012 } 2013 if (exception_ != nullptr) { 2014 visitor(reinterpret_cast<mirror::Object**>(&exception_), arg, thread_id, kRootNativeStack); 2015 } 2016 throw_location_.VisitRoots(visitor, arg); 2017 if (class_loader_override_ != nullptr) { 2018 visitor(reinterpret_cast<mirror::Object**>(&class_loader_override_), arg, thread_id, 2019 kRootNativeStack); 2020 } 2021 jni_env_->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2022 jni_env_->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2023 SirtVisitRoots(visitor, arg, thread_id); 2024 // Visit roots on this thread's stack 2025 Context* context = GetLongJumpContext(); 2026 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2027 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2028 mapper.WalkStack(); 2029 ReleaseLongJumpContext(context); 2030 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2031 if (frame.this_object_ != nullptr) { 2032 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2033 } 2034 DCHECK(frame.method_ != nullptr); 2035 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2036 } 2037} 2038 2039static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2040 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2041 VerifyObject(*root); 2042} 2043 2044void Thread::VerifyStackImpl() { 2045 UniquePtr<Context> context(Context::Create()); 2046 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2047 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2048 mapper.WalkStack(); 2049} 2050 2051// Set the stack end to that to be used during a stack overflow 2052void Thread::SetStackEndForStackOverflow() { 2053 // During stack overflow we allow use of the full stack. 2054 if (stack_end_ == stack_begin_) { 2055 // However, we seem to have already extended to use the full stack. 2056 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2057 << kStackOverflowReservedBytes << ")?"; 2058 DumpStack(LOG(ERROR)); 2059 LOG(FATAL) << "Recursive stack overflow."; 2060 } 2061 2062 stack_end_ = stack_begin_; 2063} 2064 2065void Thread::SetTlab(byte* start, byte* end) { 2066 DCHECK_LE(start, end); 2067 thread_local_start_ = start; 2068 thread_local_pos_ = thread_local_start_; 2069 thread_local_end_ = end; 2070 thread_local_objects_ = 0; 2071} 2072 2073std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2074 thread.ShortDump(os); 2075 return os; 2076} 2077 2078} // namespace art 2079