thread.cc revision 067d20fd2fddd947ce3a014d023e9de249082ebe
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 InitCardTable(); 306 InitTid(); 307 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 308 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 309 pthread_self_ = pthread_self(); 310 CHECK(is_started_); 311 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 312 DCHECK_EQ(Thread::Current(), this); 313 314 thin_lock_thread_id_ = thread_list->AllocThreadId(this); 315 InitStackHwm(); 316 317 jni_env_ = new JNIEnvExt(this, java_vm); 318 thread_list->Register(this); 319} 320 321Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 322 bool create_peer) { 323 Thread* self; 324 Runtime* runtime = Runtime::Current(); 325 if (runtime == nullptr) { 326 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 327 return nullptr; 328 } 329 { 330 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 331 if (runtime->IsShuttingDownLocked()) { 332 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 333 return nullptr; 334 } else { 335 Runtime::Current()->StartThreadBirth(); 336 self = new Thread(as_daemon); 337 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 338 Runtime::Current()->EndThreadBirth(); 339 } 340 } 341 342 CHECK_NE(self->GetState(), kRunnable); 343 self->SetState(kNative); 344 345 // If we're the main thread, ClassLinker won't be created until after we're attached, 346 // so that thread needs a two-stage attach. Regular threads don't need this hack. 347 // In the compiler, all threads need this hack, because no-one's going to be getting 348 // a native peer! 349 if (create_peer) { 350 self->CreatePeer(thread_name, as_daemon, thread_group); 351 } else { 352 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 353 if (thread_name != nullptr) { 354 self->name_->assign(thread_name); 355 ::art::SetThreadName(thread_name); 356 } 357 } 358 359 return self; 360} 361 362void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 363 Runtime* runtime = Runtime::Current(); 364 CHECK(runtime->IsStarted()); 365 JNIEnv* env = jni_env_; 366 367 if (thread_group == nullptr) { 368 thread_group = runtime->GetMainThreadGroup(); 369 } 370 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 371 jint thread_priority = GetNativePriority(); 372 jboolean thread_is_daemon = as_daemon; 373 374 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 375 if (peer.get() == nullptr) { 376 CHECK(IsExceptionPending()); 377 return; 378 } 379 { 380 ScopedObjectAccess soa(this); 381 opeer_ = soa.Decode<mirror::Object*>(peer.get()); 382 } 383 env->CallNonvirtualVoidMethod(peer.get(), 384 WellKnownClasses::java_lang_Thread, 385 WellKnownClasses::java_lang_Thread_init, 386 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 387 AssertNoPendingException(); 388 389 Thread* self = this; 390 DCHECK_EQ(self, Thread::Current()); 391 jni_env_->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 392 reinterpret_cast<jlong>(self)); 393 394 ScopedObjectAccess soa(self); 395 SirtRef<mirror::String> peer_thread_name(soa.Self(), GetThreadName(soa)); 396 if (peer_thread_name.get() == nullptr) { 397 // The Thread constructor should have set the Thread.name to a 398 // non-null value. However, because we can run without code 399 // available (in the compiler, in tests), we manually assign the 400 // fields the constructor should have set. 401 if (runtime->IsActiveTransaction()) { 402 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 403 } else { 404 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 405 } 406 peer_thread_name.reset(GetThreadName(soa)); 407 } 408 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 409 if (peer_thread_name.get() != nullptr) { 410 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 411 } 412} 413 414template<bool kTransactionActive> 415void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 416 jobject thread_name, jint thread_priority) { 417 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 418 SetBoolean<kTransactionActive>(opeer_, thread_is_daemon); 419 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 420 SetObject<kTransactionActive>(opeer_, soa.Decode<mirror::Object*>(thread_group)); 421 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 422 SetObject<kTransactionActive>(opeer_, soa.Decode<mirror::Object*>(thread_name)); 423 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 424 SetInt<kTransactionActive>(opeer_, thread_priority); 425} 426 427void Thread::SetThreadName(const char* name) { 428 name_->assign(name); 429 ::art::SetThreadName(name); 430 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 431} 432 433void Thread::InitStackHwm() { 434 void* stack_base; 435 size_t stack_size; 436 GetThreadStack(pthread_self_, &stack_base, &stack_size); 437 438 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 439 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", stack_base, PrettySize(stack_size).c_str()); 440 441 stack_begin_ = reinterpret_cast<byte*>(stack_base); 442 stack_size_ = stack_size; 443 444 if (stack_size_ <= kStackOverflowReservedBytes) { 445 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << stack_size_ << " bytes)"; 446 } 447 448 // TODO: move this into the Linux GetThreadStack implementation. 449#if !defined(__APPLE__) 450 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 451 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 452 // will be broken because we'll die long before we get close to 2GB. 453 bool is_main_thread = (::art::GetTid() == getpid()); 454 if (is_main_thread) { 455 rlimit stack_limit; 456 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 457 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 458 } 459 if (stack_limit.rlim_cur == RLIM_INFINITY) { 460 // Find the default stack size for new threads... 461 pthread_attr_t default_attributes; 462 size_t default_stack_size; 463 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 464 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 465 "default stack size query"); 466 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 467 468 // ...and use that as our limit. 469 size_t old_stack_size = stack_size_; 470 stack_size_ = default_stack_size; 471 stack_begin_ += (old_stack_size - stack_size_); 472 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 473 << " to " << PrettySize(stack_size_) 474 << " with base " << reinterpret_cast<void*>(stack_begin_); 475 } 476 } 477#endif 478 479 // Set stack_end_ to the bottom of the stack saving space of stack overflows 480 ResetDefaultStackEnd(); 481 482 // Sanity check. 483 int stack_variable; 484 CHECK_GT(&stack_variable, reinterpret_cast<void*>(stack_end_)); 485} 486 487void Thread::ShortDump(std::ostream& os) const { 488 os << "Thread["; 489 if (GetThreadId() != 0) { 490 // If we're in kStarting, we won't have a thin lock id or tid yet. 491 os << GetThreadId() 492 << ",tid=" << GetTid() << ','; 493 } 494 os << GetState() 495 << ",Thread*=" << this 496 << ",peer=" << opeer_ 497 << ",\"" << *name_ << "\"" 498 << "]"; 499} 500 501void Thread::Dump(std::ostream& os) const { 502 DumpState(os); 503 DumpStack(os); 504} 505 506mirror::String* Thread::GetThreadName(const ScopedObjectAccessUnchecked& soa) const { 507 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 508 return (opeer_ != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(opeer_)) : nullptr; 509} 510 511void Thread::GetThreadName(std::string& name) const { 512 name.assign(*name_); 513} 514 515uint64_t Thread::GetCpuMicroTime() const { 516#if defined(HAVE_POSIX_CLOCKS) 517 clockid_t cpu_clock_id; 518 pthread_getcpuclockid(pthread_self_, &cpu_clock_id); 519 timespec now; 520 clock_gettime(cpu_clock_id, &now); 521 return static_cast<uint64_t>(now.tv_sec) * 1000000LL + now.tv_nsec / 1000LL; 522#else 523 UNIMPLEMENTED(WARNING); 524 return -1; 525#endif 526} 527 528void Thread::AtomicSetFlag(ThreadFlag flag) { 529 android_atomic_or(flag, &state_and_flags_.as_int); 530} 531 532void Thread::AtomicClearFlag(ThreadFlag flag) { 533 android_atomic_and(-1 ^ flag, &state_and_flags_.as_int); 534} 535 536// Attempt to rectify locks so that we dump thread list with required locks before exiting. 537static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 538 LOG(ERROR) << *thread << " suspend count already zero."; 539 Locks::thread_suspend_count_lock_->Unlock(self); 540 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 541 Locks::mutator_lock_->SharedTryLock(self); 542 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 543 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 544 } 545 } 546 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 547 Locks::thread_list_lock_->TryLock(self); 548 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 549 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 550 } 551 } 552 std::ostringstream ss; 553 Runtime::Current()->GetThreadList()->DumpLocked(ss); 554 LOG(FATAL) << ss.str(); 555} 556 557void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 558 DCHECK(delta == -1 || delta == +1 || delta == -debug_suspend_count_) 559 << delta << " " << debug_suspend_count_ << " " << this; 560 DCHECK_GE(suspend_count_, debug_suspend_count_) << this; 561 Locks::thread_suspend_count_lock_->AssertHeld(self); 562 if (this != self && !IsSuspended()) { 563 Locks::thread_list_lock_->AssertHeld(self); 564 } 565 if (UNLIKELY(delta < 0 && suspend_count_ <= 0)) { 566 UnsafeLogFatalForSuspendCount(self, this); 567 return; 568 } 569 570 suspend_count_ += delta; 571 if (for_debugger) { 572 debug_suspend_count_ += delta; 573 } 574 575 if (suspend_count_ == 0) { 576 AtomicClearFlag(kSuspendRequest); 577 } else { 578 AtomicSetFlag(kSuspendRequest); 579 } 580} 581 582void Thread::RunCheckpointFunction() { 583 Closure *checkpoints[kMaxCheckpoints]; 584 585 // Grab the suspend_count lock and copy the current set of 586 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 587 // function will also grab this lock so we prevent a race between setting 588 // the kCheckpointRequest flag and clearing it. 589 { 590 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 591 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 592 checkpoints[i] = checkpoint_functions_[i]; 593 checkpoint_functions_[i] = nullptr; 594 } 595 AtomicClearFlag(kCheckpointRequest); 596 } 597 598 // Outside the lock, run all the checkpoint functions that 599 // we collected. 600 bool found_checkpoint = false; 601 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 602 if (checkpoints[i] != nullptr) { 603 ATRACE_BEGIN("Checkpoint function"); 604 checkpoints[i]->Run(this); 605 ATRACE_END(); 606 found_checkpoint = true; 607 } 608 } 609 CHECK(found_checkpoint); 610} 611 612bool Thread::RequestCheckpoint(Closure* function) { 613 union StateAndFlags old_state_and_flags; 614 old_state_and_flags.as_int = state_and_flags_.as_int; 615 if (old_state_and_flags.as_struct.state != kRunnable) { 616 return false; // Fail, thread is suspended and so can't run a checkpoint. 617 } 618 619 uint32_t available_checkpoint = kMaxCheckpoints; 620 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 621 if (checkpoint_functions_[i] == nullptr) { 622 available_checkpoint = i; 623 break; 624 } 625 } 626 if (available_checkpoint == kMaxCheckpoints) { 627 // No checkpoint functions available, we can't run a checkpoint 628 return false; 629 } 630 checkpoint_functions_[available_checkpoint] = function; 631 632 // Checkpoint function installed now install flag bit. 633 // We must be runnable to request a checkpoint. 634 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 635 union StateAndFlags new_state_and_flags; 636 new_state_and_flags.as_int = old_state_and_flags.as_int; 637 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 638 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 639 &state_and_flags_.as_int); 640 if (UNLIKELY(succeeded != 0)) { 641 // The thread changed state before the checkpoint was installed. 642 CHECK_EQ(checkpoint_functions_[available_checkpoint], function); 643 checkpoint_functions_[available_checkpoint] = nullptr; 644 } else { 645 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 646 } 647 return succeeded == 0; 648} 649 650void Thread::FullSuspendCheck() { 651 VLOG(threads) << this << " self-suspending"; 652 ATRACE_BEGIN("Full suspend check"); 653 // Make thread appear suspended to other threads, release mutator_lock_. 654 TransitionFromRunnableToSuspended(kSuspended); 655 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 656 TransitionFromSuspendedToRunnable(); 657 ATRACE_END(); 658 VLOG(threads) << this << " self-reviving"; 659} 660 661void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 662 std::string group_name; 663 int priority; 664 bool is_daemon = false; 665 Thread* self = Thread::Current(); 666 667 if (self != nullptr && thread != nullptr && thread->opeer_ != nullptr) { 668 ScopedObjectAccessUnchecked soa(self); 669 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)->GetInt(thread->opeer_); 670 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)->GetBoolean(thread->opeer_); 671 672 mirror::Object* thread_group = 673 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->opeer_); 674 675 if (thread_group != nullptr) { 676 mirror::ArtField* group_name_field = 677 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 678 mirror::String* group_name_string = 679 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 680 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 681 } 682 } else { 683 priority = GetNativePriority(); 684 } 685 686 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 687 if (scheduler_group_name.empty()) { 688 scheduler_group_name = "default"; 689 } 690 691 if (thread != nullptr) { 692 os << '"' << *thread->name_ << '"'; 693 if (is_daemon) { 694 os << " daemon"; 695 } 696 os << " prio=" << priority 697 << " tid=" << thread->GetThreadId() 698 << " " << thread->GetState(); 699 if (thread->IsStillStarting()) { 700 os << " (still starting up)"; 701 } 702 os << "\n"; 703 } else { 704 os << '"' << ::art::GetThreadName(tid) << '"' 705 << " prio=" << priority 706 << " (not attached)\n"; 707 } 708 709 if (thread != nullptr) { 710 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 711 os << " | group=\"" << group_name << "\"" 712 << " sCount=" << thread->suspend_count_ 713 << " dsCount=" << thread->debug_suspend_count_ 714 << " obj=" << reinterpret_cast<void*>(thread->opeer_) 715 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 716 } 717 718 os << " | sysTid=" << tid 719 << " nice=" << getpriority(PRIO_PROCESS, tid) 720 << " cgrp=" << scheduler_group_name; 721 if (thread != nullptr) { 722 int policy; 723 sched_param sp; 724 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->pthread_self_, &policy, &sp), __FUNCTION__); 725 os << " sched=" << policy << "/" << sp.sched_priority 726 << " handle=" << reinterpret_cast<void*>(thread->pthread_self_); 727 } 728 os << "\n"; 729 730 // Grab the scheduler stats for this thread. 731 std::string scheduler_stats; 732 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 733 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 734 } else { 735 scheduler_stats = "0 0 0"; 736 } 737 738 char native_thread_state = '?'; 739 int utime = 0; 740 int stime = 0; 741 int task_cpu = 0; 742 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 743 744 os << " | state=" << native_thread_state 745 << " schedstat=( " << scheduler_stats << " )" 746 << " utm=" << utime 747 << " stm=" << stime 748 << " core=" << task_cpu 749 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 750 if (thread != nullptr) { 751 os << " | stack=" << reinterpret_cast<void*>(thread->stack_begin_) << "-" << reinterpret_cast<void*>(thread->stack_end_) 752 << " stackSize=" << PrettySize(thread->stack_size_) << "\n"; 753 } 754} 755 756void Thread::DumpState(std::ostream& os) const { 757 Thread::DumpState(os, this, GetTid()); 758} 759 760struct StackDumpVisitor : public StackVisitor { 761 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 762 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 763 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 764 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 765 } 766 767 virtual ~StackDumpVisitor() { 768 if (frame_count == 0) { 769 os << " (no managed stack frames)\n"; 770 } 771 } 772 773 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 774 mirror::ArtMethod* m = GetMethod(); 775 if (m->IsRuntimeMethod()) { 776 return true; 777 } 778 const int kMaxRepetition = 3; 779 mirror::Class* c = m->GetDeclaringClass(); 780 mirror::DexCache* dex_cache = c->GetDexCache(); 781 int line_number = -1; 782 if (dex_cache != nullptr) { // be tolerant of bad input 783 const DexFile& dex_file = *dex_cache->GetDexFile(); 784 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 785 } 786 if (line_number == last_line_number && last_method == m) { 787 ++repetition_count; 788 } else { 789 if (repetition_count >= kMaxRepetition) { 790 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 791 } 792 repetition_count = 0; 793 last_line_number = line_number; 794 last_method = m; 795 } 796 if (repetition_count < kMaxRepetition) { 797 os << " at " << PrettyMethod(m, false); 798 if (m->IsNative()) { 799 os << "(Native method)"; 800 } else { 801 mh.ChangeMethod(m); 802 const char* source_file(mh.GetDeclaringClassSourceFile()); 803 os << "(" << (source_file != nullptr ? source_file : "unavailable") 804 << ":" << line_number << ")"; 805 } 806 os << "\n"; 807 if (frame_count == 0) { 808 Monitor::DescribeWait(os, thread); 809 } 810 if (can_allocate) { 811 Monitor::VisitLocks(this, DumpLockedObject, &os); 812 } 813 } 814 815 ++frame_count; 816 return true; 817 } 818 819 static void DumpLockedObject(mirror::Object* o, void* context) 820 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 821 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 822 os << " - locked <" << o << "> (a " << PrettyTypeOf(o) << ")\n"; 823 } 824 825 std::ostream& os; 826 const Thread* thread; 827 const bool can_allocate; 828 MethodHelper mh; 829 mirror::ArtMethod* last_method; 830 int last_line_number; 831 int repetition_count; 832 int frame_count; 833}; 834 835static bool ShouldShowNativeStack(const Thread* thread) 836 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 837 ThreadState state = thread->GetState(); 838 839 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 840 if (state > kWaiting && state < kStarting) { 841 return true; 842 } 843 844 // In an Object.wait variant or Thread.sleep? That's not interesting. 845 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 846 return false; 847 } 848 849 // In some other native method? That's interesting. 850 // We don't just check kNative because native methods will be in state kSuspended if they're 851 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 852 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 853 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 854 return current_method != nullptr && current_method->IsNative(); 855} 856 857void Thread::DumpStack(std::ostream& os) const { 858 // TODO: we call this code when dying but may not have suspended the thread ourself. The 859 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 860 // the race with the thread_suspend_count_lock_). 861 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 862 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 863 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 864 // If we're currently in native code, dump that stack before dumping the managed stack. 865 if (dump_for_abort || ShouldShowNativeStack(this)) { 866 DumpKernelStack(os, GetTid(), " kernel: ", false); 867 SirtRef<mirror::ArtMethod> method_ref(Thread::Current(), GetCurrentMethod(nullptr)); 868 DumpNativeStack(os, GetTid(), " native: ", false, method_ref.get()); 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 1008void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1009 if (UNLIKELY(IsExceptionPending())) { 1010 ScopedObjectAccess soa(Thread::Current()); 1011 mirror::Throwable* exception = GetException(nullptr); 1012 LOG(FATAL) << "Throwing new exception " << msg << " with unexpected pending exception: " 1013 << exception->Dump(); 1014 } 1015} 1016 1017static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1018 RootType /*root_type*/) 1019 NO_THREAD_SAFETY_ANALYSIS { 1020 Thread* self = reinterpret_cast<Thread*>(arg); 1021 mirror::Object* entered_monitor = *object; 1022 if (self->HoldsLock(entered_monitor)) { 1023 LOG(WARNING) << "Calling MonitorExit on object " 1024 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1025 << " left locked by native thread " 1026 << *Thread::Current() << " which is detaching"; 1027 entered_monitor->MonitorExit(self); 1028 } 1029} 1030 1031void Thread::Destroy() { 1032 Thread* self = this; 1033 DCHECK_EQ(self, Thread::Current()); 1034 1035 if (opeer_ != nullptr) { 1036 ScopedObjectAccess soa(self); 1037 // We may need to call user-supplied managed code, do this before final clean-up. 1038 HandleUncaughtExceptions(soa); 1039 RemoveFromThreadGroup(soa); 1040 1041 // this.nativePeer = 0; 1042 if (Runtime::Current()->IsActiveTransaction()) { 1043 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong<true>(opeer_, 0); 1044 } else { 1045 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong<false>(opeer_, 0); 1046 } 1047 Dbg::PostThreadDeath(self); 1048 1049 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1050 // who is waiting. 1051 mirror::Object* lock = 1052 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 1053 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1054 if (lock != nullptr) { 1055 SirtRef<mirror::Object> sirt_obj(self, lock); 1056 ObjectLock<mirror::Object> locker(self, &sirt_obj); 1057 locker.Notify(); 1058 } 1059 } 1060 1061 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1062 if (jni_env_ != nullptr) { 1063 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1064 } 1065} 1066 1067Thread::~Thread() { 1068 if (jni_env_ != nullptr && jpeer_ != nullptr) { 1069 // If pthread_create fails we don't have a jni env here. 1070 jni_env_->DeleteGlobalRef(jpeer_); 1071 jpeer_ = nullptr; 1072 } 1073 opeer_ = nullptr; 1074 1075 bool initialized = (jni_env_ != nullptr); // Did Thread::Init run? 1076 if (initialized) { 1077 delete jni_env_; 1078 jni_env_ = nullptr; 1079 } 1080 CHECK_NE(GetState(), kRunnable); 1081 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1082 CHECK(checkpoint_functions_[0] == nullptr); 1083 CHECK(checkpoint_functions_[1] == nullptr); 1084 CHECK(checkpoint_functions_[2] == nullptr); 1085 1086 // We may be deleting a still born thread. 1087 SetStateUnsafe(kTerminated); 1088 1089 delete wait_cond_; 1090 delete wait_mutex_; 1091 1092 if (long_jump_context_ != nullptr) { 1093 delete long_jump_context_; 1094 } 1095 1096 if (initialized) { 1097 CleanupCpu(); 1098 } 1099 1100 delete debug_invoke_req_; 1101 delete single_step_control_; 1102 delete instrumentation_stack_; 1103 delete name_; 1104 delete stack_trace_sample_; 1105 1106 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1107 1108 TearDownAlternateSignalStack(); 1109} 1110 1111void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1112 if (!IsExceptionPending()) { 1113 return; 1114 } 1115 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1116 ScopedThreadStateChange tsc(this, kNative); 1117 1118 // Get and clear the exception. 1119 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1120 jni_env_->ExceptionClear(); 1121 1122 // If the thread has its own handler, use that. 1123 ScopedLocalRef<jobject> handler(jni_env_, 1124 jni_env_->GetObjectField(peer.get(), 1125 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1126 if (handler.get() == nullptr) { 1127 // Otherwise use the thread group's default handler. 1128 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1129 } 1130 1131 // Call the handler. 1132 jni_env_->CallVoidMethod(handler.get(), 1133 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1134 peer.get(), exception.get()); 1135 1136 // If the handler threw, clear that exception too. 1137 jni_env_->ExceptionClear(); 1138} 1139 1140void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1141 // this.group.removeThread(this); 1142 // group can be null if we're in the compiler or a test. 1143 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1144 if (ogroup != nullptr) { 1145 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1146 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1147 ScopedThreadStateChange tsc(soa.Self(), kNative); 1148 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1149 peer.get()); 1150 } 1151} 1152 1153size_t Thread::NumSirtReferences() { 1154 size_t count = 0; 1155 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1156 count += cur->NumberOfReferences(); 1157 } 1158 return count; 1159} 1160 1161bool Thread::SirtContains(jobject obj) const { 1162 StackReference<mirror::Object>* sirt_entry = 1163 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1164 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1165 if (cur->Contains(sirt_entry)) { 1166 return true; 1167 } 1168 } 1169 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1170 return managed_stack_.ShadowFramesContain(sirt_entry); 1171} 1172 1173void Thread::SirtVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1174 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1175 size_t num_refs = cur->NumberOfReferences(); 1176 for (size_t j = 0; j < num_refs; ++j) { 1177 mirror::Object* object = cur->GetReference(j); 1178 if (object != nullptr) { 1179 mirror::Object* old_obj = object; 1180 visitor(&object, arg, thread_id, kRootNativeStack); 1181 if (old_obj != object) { 1182 cur->SetReference(j, object); 1183 } 1184 } 1185 } 1186 } 1187} 1188 1189mirror::Object* Thread::DecodeJObject(jobject obj) const { 1190 Locks::mutator_lock_->AssertSharedHeld(this); 1191 if (obj == nullptr) { 1192 return nullptr; 1193 } 1194 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1195 IndirectRefKind kind = GetIndirectRefKind(ref); 1196 mirror::Object* result; 1197 // The "kinds" below are sorted by the frequency we expect to encounter them. 1198 if (kind == kLocal) { 1199 IndirectReferenceTable& locals = jni_env_->locals; 1200 result = const_cast<mirror::Object*>(locals.Get(ref)); 1201 } else if (kind == kSirtOrInvalid) { 1202 // TODO: make stack indirect reference table lookup more efficient. 1203 // Check if this is a local reference in the SIRT. 1204 if (LIKELY(SirtContains(obj))) { 1205 // Read from SIRT. 1206 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1207 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1208 // Assume an invalid local reference is actually a direct pointer. 1209 result = reinterpret_cast<mirror::Object*>(obj); 1210 } else { 1211 result = kInvalidIndirectRefObject; 1212 } 1213 } else if (kind == kGlobal) { 1214 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1215 IndirectReferenceTable& globals = vm->globals; 1216 ReaderMutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1217 result = const_cast<mirror::Object*>(globals.Get(ref)); 1218 } else { 1219 DCHECK_EQ(kind, kWeakGlobal); 1220 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1221 if (result == kClearedJniWeakGlobal) { 1222 // This is a special case where it's okay to return nullptr. 1223 return nullptr; 1224 } 1225 } 1226 1227 if (UNLIKELY(result == nullptr)) { 1228 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1229 } else { 1230 if (result != kInvalidIndirectRefObject) { 1231 VerifyObject(result); 1232 } 1233 } 1234 return result; 1235} 1236 1237// Implements java.lang.Thread.interrupted. 1238bool Thread::Interrupted() { 1239 MutexLock mu(Thread::Current(), *wait_mutex_); 1240 bool interrupted = interrupted_; 1241 interrupted_ = false; 1242 return interrupted; 1243} 1244 1245// Implements java.lang.Thread.isInterrupted. 1246bool Thread::IsInterrupted() { 1247 MutexLock mu(Thread::Current(), *wait_mutex_); 1248 return interrupted_; 1249} 1250 1251void Thread::Interrupt() { 1252 Thread* self = Thread::Current(); 1253 MutexLock mu(self, *wait_mutex_); 1254 if (interrupted_) { 1255 return; 1256 } 1257 interrupted_ = true; 1258 NotifyLocked(self); 1259} 1260 1261void Thread::Notify() { 1262 Thread* self = Thread::Current(); 1263 MutexLock mu(self, *wait_mutex_); 1264 NotifyLocked(self); 1265} 1266 1267void Thread::NotifyLocked(Thread* self) { 1268 if (wait_monitor_ != nullptr) { 1269 wait_cond_->Signal(self); 1270 } 1271} 1272 1273class CountStackDepthVisitor : public StackVisitor { 1274 public: 1275 explicit CountStackDepthVisitor(Thread* thread) 1276 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1277 : StackVisitor(thread, nullptr), 1278 depth_(0), skip_depth_(0), skipping_(true) {} 1279 1280 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1281 // We want to skip frames up to and including the exception's constructor. 1282 // Note we also skip the frame if it doesn't have a method (namely the callee 1283 // save frame) 1284 mirror::ArtMethod* m = GetMethod(); 1285 if (skipping_ && !m->IsRuntimeMethod() && 1286 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1287 skipping_ = false; 1288 } 1289 if (!skipping_) { 1290 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1291 ++depth_; 1292 } 1293 } else { 1294 ++skip_depth_; 1295 } 1296 return true; 1297 } 1298 1299 int GetDepth() const { 1300 return depth_; 1301 } 1302 1303 int GetSkipDepth() const { 1304 return skip_depth_; 1305 } 1306 1307 private: 1308 uint32_t depth_; 1309 uint32_t skip_depth_; 1310 bool skipping_; 1311}; 1312 1313class BuildInternalStackTraceVisitor : public StackVisitor { 1314 public: 1315 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1316 : StackVisitor(thread, nullptr), self_(self), 1317 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1318 1319 bool Init(int depth) 1320 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1321 // Allocate method trace with an extra slot that will hold the PC trace 1322 SirtRef<mirror::ObjectArray<mirror::Object> > 1323 method_trace(self_, 1324 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1325 depth + 1)); 1326 if (method_trace.get() == nullptr) { 1327 return false; 1328 } 1329 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1330 if (dex_pc_trace == nullptr) { 1331 return false; 1332 } 1333 // Save PC trace in last element of method trace, also places it into the 1334 // object graph. 1335 // We are called from native: use non-transactional mode. 1336 method_trace->Set<false>(depth, dex_pc_trace); 1337 // Set the Object*s and assert that no thread suspension is now possible. 1338 const char* last_no_suspend_cause = 1339 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1340 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1341 method_trace_ = method_trace.get(); 1342 dex_pc_trace_ = dex_pc_trace; 1343 return true; 1344 } 1345 1346 virtual ~BuildInternalStackTraceVisitor() { 1347 if (method_trace_ != nullptr) { 1348 self_->EndAssertNoThreadSuspension(nullptr); 1349 } 1350 } 1351 1352 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1353 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1354 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1355 } 1356 if (skip_depth_ > 0) { 1357 skip_depth_--; 1358 return true; 1359 } 1360 mirror::ArtMethod* m = GetMethod(); 1361 if (m->IsRuntimeMethod()) { 1362 return true; // Ignore runtime frames (in particular callee save). 1363 } 1364 // TODO dedup this code. 1365 if (Runtime::Current()->IsActiveTransaction()) { 1366 method_trace_->Set<true>(count_, m); 1367 dex_pc_trace_->Set<true>(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1368 } else { 1369 method_trace_->Set<false>(count_, m); 1370 dex_pc_trace_->Set<false>(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1371 } 1372 ++count_; 1373 return true; 1374 } 1375 1376 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1377 return method_trace_; 1378 } 1379 1380 private: 1381 Thread* const self_; 1382 // How many more frames to skip. 1383 int32_t skip_depth_; 1384 // Current position down stack trace. 1385 uint32_t count_; 1386 // Array of dex PC values. 1387 mirror::IntArray* dex_pc_trace_; 1388 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1389 mirror::ObjectArray<mirror::Object>* method_trace_; 1390}; 1391 1392jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1393 // Compute depth of stack 1394 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1395 count_visitor.WalkStack(); 1396 int32_t depth = count_visitor.GetDepth(); 1397 int32_t skip_depth = count_visitor.GetSkipDepth(); 1398 1399 // Build internal stack trace. 1400 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1401 skip_depth); 1402 if (!build_trace_visitor.Init(depth)) { 1403 return nullptr; // Allocation failed. 1404 } 1405 build_trace_visitor.WalkStack(); 1406 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1407 if (kIsDebugBuild) { 1408 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1409 CHECK(trace->Get(i) != nullptr); 1410 } 1411 } 1412 return soa.AddLocalReference<jobjectArray>(trace); 1413} 1414 1415jobjectArray Thread::InternalStackTraceToStackTraceElementArray(JNIEnv* env, jobject internal, 1416 jobjectArray output_array, int* stack_depth) { 1417 // Transition into runnable state to work on Object*/Array* 1418 ScopedObjectAccess soa(env); 1419 // Decode the internal stack trace into the depth, method trace and PC trace 1420 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1421 1422 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1423 1424 jobjectArray result; 1425 1426 if (output_array != nullptr) { 1427 // Reuse the array we were given. 1428 result = output_array; 1429 // ...adjusting the number of frames we'll write to not exceed the array length. 1430 const int32_t traces_length = 1431 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1432 depth = std::min(depth, traces_length); 1433 } else { 1434 // Create java_trace array and place in local reference table 1435 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1436 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1437 if (java_traces == nullptr) { 1438 return nullptr; 1439 } 1440 result = soa.AddLocalReference<jobjectArray>(java_traces); 1441 } 1442 1443 if (stack_depth != nullptr) { 1444 *stack_depth = depth; 1445 } 1446 1447 for (int32_t i = 0; i < depth; ++i) { 1448 mirror::ObjectArray<mirror::Object>* method_trace = 1449 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1450 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1451 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1452 MethodHelper mh(method); 1453 int32_t line_number; 1454 SirtRef<mirror::String> class_name_object(soa.Self(), nullptr); 1455 SirtRef<mirror::String> source_name_object(soa.Self(), nullptr); 1456 if (method->IsProxyMethod()) { 1457 line_number = -1; 1458 class_name_object.reset(method->GetDeclaringClass()->GetName()); 1459 // source_name_object intentionally left null for proxy methods 1460 } else { 1461 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1462 uint32_t dex_pc = pc_trace->Get(i); 1463 line_number = mh.GetLineNumFromDexPC(dex_pc); 1464 // Allocate element, potentially triggering GC 1465 // TODO: reuse class_name_object via Class::name_? 1466 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1467 CHECK(descriptor != nullptr); 1468 std::string class_name(PrettyDescriptor(descriptor)); 1469 class_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1470 if (class_name_object.get() == nullptr) { 1471 return nullptr; 1472 } 1473 const char* source_file = mh.GetDeclaringClassSourceFile(); 1474 if (source_file != nullptr) { 1475 source_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1476 if (source_name_object.get() == nullptr) { 1477 return nullptr; 1478 } 1479 } 1480 } 1481 const char* method_name = mh.GetName(); 1482 CHECK(method_name != nullptr); 1483 SirtRef<mirror::String> method_name_object(soa.Self(), 1484 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1485 method_name)); 1486 if (method_name_object.get() == nullptr) { 1487 return nullptr; 1488 } 1489 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1490 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1491 if (obj == nullptr) { 1492 return nullptr; 1493 } 1494 // We are called from native: use non-transactional mode. 1495 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1496 } 1497 return result; 1498} 1499 1500void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1501 const char* exception_class_descriptor, const char* fmt, ...) { 1502 va_list args; 1503 va_start(args, fmt); 1504 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1505 fmt, args); 1506 va_end(args); 1507} 1508 1509void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1510 const char* exception_class_descriptor, 1511 const char* fmt, va_list ap) { 1512 std::string msg; 1513 StringAppendV(&msg, fmt, ap); 1514 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1515} 1516 1517void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1518 const char* msg) { 1519 // Callers should either clear or call ThrowNewWrappedException. 1520 AssertNoPendingExceptionForNewException(msg); 1521 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1522} 1523 1524void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1525 const char* exception_class_descriptor, 1526 const char* msg) { 1527 DCHECK_EQ(this, Thread::Current()); 1528 // Ensure we don't forget arguments over object allocation. 1529 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1530 SirtRef<mirror::ArtMethod> saved_throw_method(this, throw_location.GetMethod()); 1531 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1532 SirtRef<mirror::Throwable> cause(this, GetException(nullptr)); 1533 ClearException(); 1534 Runtime* runtime = Runtime::Current(); 1535 1536 mirror::ClassLoader* cl = nullptr; 1537 if (saved_throw_method.get() != nullptr) { 1538 cl = saved_throw_method.get()->GetDeclaringClass()->GetClassLoader(); 1539 } 1540 SirtRef<mirror::ClassLoader> class_loader(this, cl); 1541 SirtRef<mirror::Class> 1542 exception_class(this, runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1543 class_loader)); 1544 if (UNLIKELY(exception_class.get() == nullptr)) { 1545 CHECK(IsExceptionPending()); 1546 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1547 return; 1548 } 1549 1550 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1551 DCHECK(IsExceptionPending()); 1552 return; 1553 } 1554 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1555 SirtRef<mirror::Throwable> exception(this, 1556 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1557 1558 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1559 if (exception.get() == nullptr) { 1560 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1561 throw_location.GetDexPc()); 1562 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1563 return; 1564 } 1565 1566 // Choose an appropriate constructor and set up the arguments. 1567 const char* signature; 1568 const char* shorty; 1569 SirtRef<mirror::String> msg_string(this, nullptr); 1570 if (msg != nullptr) { 1571 // Ensure we remember this and the method over the String allocation. 1572 msg_string.reset(mirror::String::AllocFromModifiedUtf8(this, msg)); 1573 if (UNLIKELY(msg_string.get() == nullptr)) { 1574 CHECK(IsExceptionPending()); // OOME. 1575 return; 1576 } 1577 if (cause.get() == nullptr) { 1578 shorty = "VL"; 1579 signature = "(Ljava/lang/String;)V"; 1580 } else { 1581 shorty = "VLL"; 1582 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1583 } 1584 } else { 1585 if (cause.get() == nullptr) { 1586 shorty = "V"; 1587 signature = "()V"; 1588 } else { 1589 shorty = "VL"; 1590 signature = "(Ljava/lang/Throwable;)V"; 1591 } 1592 } 1593 mirror::ArtMethod* exception_init_method = 1594 exception_class->FindDeclaredDirectMethod("<init>", signature); 1595 1596 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1597 << PrettyDescriptor(exception_class_descriptor); 1598 1599 if (UNLIKELY(!runtime->IsStarted())) { 1600 // Something is trying to throw an exception without a started runtime, which is the common 1601 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1602 // the exception fields directly. 1603 if (msg != nullptr) { 1604 exception->SetDetailMessage(msg_string.get()); 1605 } 1606 if (cause.get() != nullptr) { 1607 exception->SetCause(cause.get()); 1608 } 1609 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1610 throw_location.GetDexPc()); 1611 SetException(gc_safe_throw_location, exception.get()); 1612 } else { 1613 ArgArray args(shorty, strlen(shorty)); 1614 args.Append(exception.get()); 1615 if (msg != nullptr) { 1616 args.Append(msg_string.get()); 1617 } 1618 if (cause.get() != nullptr) { 1619 args.Append(cause.get()); 1620 } 1621 JValue result; 1622 exception_init_method->Invoke(this, args.GetArray(), args.GetNumBytes(), &result, shorty); 1623 if (LIKELY(!IsExceptionPending())) { 1624 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1625 throw_location.GetDexPc()); 1626 SetException(gc_safe_throw_location, exception.get()); 1627 } 1628 } 1629} 1630 1631void Thread::ThrowOutOfMemoryError(const char* msg) { 1632 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1633 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1634 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1635 if (!throwing_OutOfMemoryError_) { 1636 throwing_OutOfMemoryError_ = true; 1637 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1638 throwing_OutOfMemoryError_ = false; 1639 } else { 1640 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1641 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1642 } 1643} 1644 1645Thread* Thread::CurrentFromGdb() { 1646 return Thread::Current(); 1647} 1648 1649void Thread::DumpFromGdb() const { 1650 std::ostringstream ss; 1651 Dump(ss); 1652 std::string str(ss.str()); 1653 // log to stderr for debugging command line processes 1654 std::cerr << str; 1655#ifdef HAVE_ANDROID_OS 1656 // log to logcat for debugging frameworks processes 1657 LOG(INFO) << str; 1658#endif 1659} 1660 1661struct EntryPointInfo { 1662 uint32_t offset; 1663 const char* name; 1664}; 1665#define INTERPRETER_ENTRY_POINT_INFO(x) { INTERPRETER_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1666#define JNI_ENTRY_POINT_INFO(x) { JNI_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1667#define PORTABLE_ENTRY_POINT_INFO(x) { PORTABLE_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1668#define QUICK_ENTRY_POINT_INFO(x) { QUICK_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1669static const EntryPointInfo gThreadEntryPointInfo[] = { 1670 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge), 1671 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge), 1672 JNI_ENTRY_POINT_INFO(pDlsymLookup), 1673 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline), 1674 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline), 1675 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge), 1676 QUICK_ENTRY_POINT_INFO(pAllocArray), 1677 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved), 1678 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck), 1679 QUICK_ENTRY_POINT_INFO(pAllocObject), 1680 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved), 1681 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized), 1682 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck), 1683 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray), 1684 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck), 1685 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial), 1686 QUICK_ENTRY_POINT_INFO(pCheckCast), 1687 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage), 1688 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess), 1689 QUICK_ENTRY_POINT_INFO(pInitializeType), 1690 QUICK_ENTRY_POINT_INFO(pResolveString), 1691 QUICK_ENTRY_POINT_INFO(pSet32Instance), 1692 QUICK_ENTRY_POINT_INFO(pSet32Static), 1693 QUICK_ENTRY_POINT_INFO(pSet64Instance), 1694 QUICK_ENTRY_POINT_INFO(pSet64Static), 1695 QUICK_ENTRY_POINT_INFO(pSetObjInstance), 1696 QUICK_ENTRY_POINT_INFO(pSetObjStatic), 1697 QUICK_ENTRY_POINT_INFO(pGet32Instance), 1698 QUICK_ENTRY_POINT_INFO(pGet32Static), 1699 QUICK_ENTRY_POINT_INFO(pGet64Instance), 1700 QUICK_ENTRY_POINT_INFO(pGet64Static), 1701 QUICK_ENTRY_POINT_INFO(pGetObjInstance), 1702 QUICK_ENTRY_POINT_INFO(pGetObjStatic), 1703 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck), 1704 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck), 1705 QUICK_ENTRY_POINT_INFO(pAputObject), 1706 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData), 1707 QUICK_ENTRY_POINT_INFO(pJniMethodStart), 1708 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1709 QUICK_ENTRY_POINT_INFO(pJniMethodEnd), 1710 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1711 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference), 1712 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1713 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline), 1714 QUICK_ENTRY_POINT_INFO(pLockObject), 1715 QUICK_ENTRY_POINT_INFO(pUnlockObject), 1716 QUICK_ENTRY_POINT_INFO(pCmpgDouble), 1717 QUICK_ENTRY_POINT_INFO(pCmpgFloat), 1718 QUICK_ENTRY_POINT_INFO(pCmplDouble), 1719 QUICK_ENTRY_POINT_INFO(pCmplFloat), 1720 QUICK_ENTRY_POINT_INFO(pFmod), 1721 QUICK_ENTRY_POINT_INFO(pSqrt), 1722 QUICK_ENTRY_POINT_INFO(pL2d), 1723 QUICK_ENTRY_POINT_INFO(pFmodf), 1724 QUICK_ENTRY_POINT_INFO(pL2f), 1725 QUICK_ENTRY_POINT_INFO(pD2iz), 1726 QUICK_ENTRY_POINT_INFO(pF2iz), 1727 QUICK_ENTRY_POINT_INFO(pIdivmod), 1728 QUICK_ENTRY_POINT_INFO(pD2l), 1729 QUICK_ENTRY_POINT_INFO(pF2l), 1730 QUICK_ENTRY_POINT_INFO(pLdiv), 1731 QUICK_ENTRY_POINT_INFO(pLmod), 1732 QUICK_ENTRY_POINT_INFO(pLmul), 1733 QUICK_ENTRY_POINT_INFO(pShlLong), 1734 QUICK_ENTRY_POINT_INFO(pShrLong), 1735 QUICK_ENTRY_POINT_INFO(pUshrLong), 1736 QUICK_ENTRY_POINT_INFO(pIndexOf), 1737 QUICK_ENTRY_POINT_INFO(pMemcmp16), 1738 QUICK_ENTRY_POINT_INFO(pStringCompareTo), 1739 QUICK_ENTRY_POINT_INFO(pMemcpy), 1740 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline), 1741 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline), 1742 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge), 1743 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1744 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1745 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1746 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1747 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1748 QUICK_ENTRY_POINT_INFO(pCheckSuspend), 1749 QUICK_ENTRY_POINT_INFO(pTestSuspend), 1750 QUICK_ENTRY_POINT_INFO(pDeliverException), 1751 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds), 1752 QUICK_ENTRY_POINT_INFO(pThrowDivZero), 1753 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod), 1754 QUICK_ENTRY_POINT_INFO(pThrowNullPointer), 1755 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow), 1756}; 1757#undef QUICK_ENTRY_POINT_INFO 1758 1759void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1760 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1761 1762#define DO_THREAD_OFFSET(x) \ 1763 if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { \ 1764 os << # x; \ 1765 return; \ 1766 } 1767 DO_THREAD_OFFSET(state_and_flags_); 1768 DO_THREAD_OFFSET(card_table_); 1769 DO_THREAD_OFFSET(exception_); 1770 DO_THREAD_OFFSET(opeer_); 1771 DO_THREAD_OFFSET(jni_env_); 1772 DO_THREAD_OFFSET(self_); 1773 DO_THREAD_OFFSET(stack_end_); 1774 DO_THREAD_OFFSET(suspend_count_); 1775 DO_THREAD_OFFSET(thin_lock_thread_id_); 1776 // DO_THREAD_OFFSET(top_of_managed_stack_); 1777 // DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1778 DO_THREAD_OFFSET(top_sirt_); 1779#undef DO_THREAD_OFFSET 1780 1781 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1782 CHECK_EQ(entry_point_count * size_of_pointers, 1783 sizeof(InterpreterEntryPoints) + sizeof(JniEntryPoints) + sizeof(PortableEntryPoints) + 1784 sizeof(QuickEntryPoints)); 1785 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, interpreter_entrypoints_); 1786 for (size_t i = 0; i < entry_point_count; ++i) { 1787 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1788 expected_offset += size_of_pointers; 1789 if (gThreadEntryPointInfo[i].offset == offset) { 1790 os << gThreadEntryPointInfo[i].name; 1791 return; 1792 } 1793 } 1794 os << offset; 1795} 1796 1797void Thread::QuickDeliverException() { 1798 // Get exception from thread. 1799 ThrowLocation throw_location; 1800 mirror::Throwable* exception = GetException(&throw_location); 1801 CHECK(exception != nullptr); 1802 // Don't leave exception visible while we try to find the handler, which may cause class 1803 // resolution. 1804 ClearException(); 1805 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1806 if (kDebugExceptionDelivery) { 1807 if (!is_deoptimization) { 1808 mirror::String* msg = exception->GetDetailMessage(); 1809 std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : ""); 1810 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1811 << ": " << str_msg << "\n"); 1812 } else { 1813 DumpStack(LOG(INFO) << "Deoptimizing: "); 1814 } 1815 } 1816 CatchFinder catch_finder(this, throw_location, exception, is_deoptimization); 1817 catch_finder.FindCatch(); 1818 catch_finder.UpdateInstrumentationStack(); 1819 catch_finder.DoLongJump(); 1820 LOG(FATAL) << "UNREACHABLE"; 1821} 1822 1823Context* Thread::GetLongJumpContext() { 1824 Context* result = long_jump_context_; 1825 if (result == nullptr) { 1826 result = Context::Create(); 1827 } else { 1828 long_jump_context_ = nullptr; // Avoid context being shared. 1829 result->Reset(); 1830 } 1831 return result; 1832} 1833 1834struct CurrentMethodVisitor : public StackVisitor { 1835 CurrentMethodVisitor(Thread* thread, Context* context) 1836 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1837 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1838 virtual bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1839 mirror::ArtMethod* m = GetMethod(); 1840 if (m->IsRuntimeMethod()) { 1841 // Continue if this is a runtime method. 1842 return true; 1843 } 1844 if (context_ != nullptr) { 1845 this_object_ = GetThisObject(); 1846 } 1847 method_ = m; 1848 dex_pc_ = GetDexPc(); 1849 return false; 1850 } 1851 mirror::Object* this_object_; 1852 mirror::ArtMethod* method_; 1853 uint32_t dex_pc_; 1854}; 1855 1856mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1857 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1858 visitor.WalkStack(false); 1859 if (dex_pc != nullptr) { 1860 *dex_pc = visitor.dex_pc_; 1861 } 1862 return visitor.method_; 1863} 1864 1865ThrowLocation Thread::GetCurrentLocationForThrow() { 1866 Context* context = GetLongJumpContext(); 1867 CurrentMethodVisitor visitor(this, context); 1868 visitor.WalkStack(false); 1869 ReleaseLongJumpContext(context); 1870 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1871} 1872 1873bool Thread::HoldsLock(mirror::Object* object) { 1874 if (object == nullptr) { 1875 return false; 1876 } 1877 return object->GetLockOwnerThreadId() == thin_lock_thread_id_; 1878} 1879 1880// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1881template <typename RootVisitor> 1882class ReferenceMapVisitor : public StackVisitor { 1883 public: 1884 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1885 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1886 : StackVisitor(thread, context), visitor_(visitor) {} 1887 1888 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1889 if (false) { 1890 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1891 << StringPrintf("@ PC:%04x", GetDexPc()); 1892 } 1893 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1894 if (shadow_frame != nullptr) { 1895 mirror::ArtMethod* m = shadow_frame->GetMethod(); 1896 size_t num_regs = shadow_frame->NumberOfVRegs(); 1897 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1898 // SIRT for JNI or References for interpreter. 1899 for (size_t reg = 0; reg < num_regs; ++reg) { 1900 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1901 if (ref != nullptr) { 1902 mirror::Object* new_ref = ref; 1903 visitor_(&new_ref, reg, this); 1904 if (new_ref != ref) { 1905 shadow_frame->SetVRegReference(reg, new_ref); 1906 } 1907 } 1908 } 1909 } else { 1910 // Java method. 1911 // Portable path use DexGcMap and store in Method.native_gc_map_. 1912 const uint8_t* gc_map = m->GetNativeGcMap(); 1913 CHECK(gc_map != nullptr) << PrettyMethod(m); 1914 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 1915 uint32_t dex_pc = GetDexPc(); 1916 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 1917 DCHECK(reg_bitmap != nullptr); 1918 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 1919 for (size_t reg = 0; reg < num_regs; ++reg) { 1920 if (TestBitmap(reg, reg_bitmap)) { 1921 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1922 if (ref != nullptr) { 1923 mirror::Object* new_ref = ref; 1924 visitor_(&new_ref, reg, this); 1925 if (new_ref != ref) { 1926 shadow_frame->SetVRegReference(reg, new_ref); 1927 } 1928 } 1929 } 1930 } 1931 } 1932 } else { 1933 mirror::ArtMethod* m = GetMethod(); 1934 // Process register map (which native and runtime methods don't have) 1935 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 1936 const uint8_t* native_gc_map = m->GetNativeGcMap(); 1937 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 1938 mh_.ChangeMethod(m); 1939 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 1940 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 1941 NativePcOffsetToReferenceMap map(native_gc_map); 1942 size_t num_regs = std::min(map.RegWidth() * 8, 1943 static_cast<size_t>(code_item->registers_size_)); 1944 if (num_regs > 0) { 1945 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 1946 DCHECK(reg_bitmap != nullptr); 1947 const VmapTable vmap_table(m->GetVmapTable()); 1948 uint32_t core_spills = m->GetCoreSpillMask(); 1949 uint32_t fp_spills = m->GetFpSpillMask(); 1950 size_t frame_size = m->GetFrameSizeInBytes(); 1951 // For all dex registers in the bitmap 1952 mirror::ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 1953 DCHECK(cur_quick_frame != nullptr); 1954 for (size_t reg = 0; reg < num_regs; ++reg) { 1955 // Does this register hold a reference? 1956 if (TestBitmap(reg, reg_bitmap)) { 1957 uint32_t vmap_offset; 1958 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 1959 int vmap_reg = vmap_table.ComputeRegister(core_spills, vmap_offset, kReferenceVReg); 1960 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 1961 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 1962 if (*ref_addr != nullptr) { 1963 visitor_(ref_addr, reg, this); 1964 } 1965 } else { 1966 StackReference<mirror::Object>* ref_addr = 1967 reinterpret_cast<StackReference<mirror::Object>*>( 1968 GetVRegAddr(cur_quick_frame, code_item, core_spills, fp_spills, frame_size, 1969 reg)); 1970 mirror::Object* ref = ref_addr->AsMirrorPtr(); 1971 if (ref != nullptr) { 1972 mirror::Object* new_ref = ref; 1973 visitor_(&new_ref, reg, this); 1974 if (ref != new_ref) { 1975 ref_addr->Assign(new_ref); 1976 } 1977 } 1978 } 1979 } 1980 } 1981 } 1982 } 1983 } 1984 return true; 1985 } 1986 1987 private: 1988 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 1989 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 1990 } 1991 1992 // Visitor for when we visit a root. 1993 const RootVisitor& visitor_; 1994 1995 // A method helper we keep around to avoid dex file/cache re-computations. 1996 MethodHelper mh_; 1997}; 1998 1999class RootCallbackVisitor { 2000 public: 2001 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2002 : callback_(callback), arg_(arg), tid_(tid) {} 2003 2004 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2005 callback_(obj, arg_, tid_, kRootJavaFrame); 2006 } 2007 2008 private: 2009 RootCallback* const callback_; 2010 void* const arg_; 2011 const uint32_t tid_; 2012}; 2013 2014void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2015 VerifyObject(class_loader_override); 2016 class_loader_override_ = class_loader_override; 2017} 2018 2019void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2020 uint32_t thread_id = GetThreadId(); 2021 if (opeer_ != nullptr) { 2022 visitor(&opeer_, arg, thread_id, kRootThreadObject); 2023 } 2024 if (exception_ != nullptr) { 2025 visitor(reinterpret_cast<mirror::Object**>(&exception_), arg, thread_id, kRootNativeStack); 2026 } 2027 throw_location_.VisitRoots(visitor, arg); 2028 if (class_loader_override_ != nullptr) { 2029 visitor(reinterpret_cast<mirror::Object**>(&class_loader_override_), arg, thread_id, 2030 kRootNativeStack); 2031 } 2032 jni_env_->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2033 jni_env_->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2034 SirtVisitRoots(visitor, arg, thread_id); 2035 // Visit roots on this thread's stack 2036 Context* context = GetLongJumpContext(); 2037 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2038 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2039 mapper.WalkStack(); 2040 ReleaseLongJumpContext(context); 2041 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2042 if (frame.this_object_ != nullptr) { 2043 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2044 } 2045 DCHECK(frame.method_ != nullptr); 2046 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2047 } 2048} 2049 2050static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2051 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2052 VerifyObject(*root); 2053} 2054 2055void Thread::VerifyStackImpl() { 2056 UniquePtr<Context> context(Context::Create()); 2057 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2058 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2059 mapper.WalkStack(); 2060} 2061 2062// Set the stack end to that to be used during a stack overflow 2063void Thread::SetStackEndForStackOverflow() { 2064 // During stack overflow we allow use of the full stack. 2065 if (stack_end_ == stack_begin_) { 2066 // However, we seem to have already extended to use the full stack. 2067 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2068 << kStackOverflowReservedBytes << ")?"; 2069 DumpStack(LOG(ERROR)); 2070 LOG(FATAL) << "Recursive stack overflow."; 2071 } 2072 2073 stack_end_ = stack_begin_; 2074} 2075 2076void Thread::SetTlab(byte* start, byte* end) { 2077 DCHECK_LE(start, end); 2078 thread_local_start_ = start; 2079 thread_local_pos_ = thread_local_start_; 2080 thread_local_end_ = end; 2081 thread_local_objects_ = 0; 2082} 2083 2084std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2085 thread.ShortDump(os); 2086 return os; 2087} 2088 2089} // namespace art 2090