thread.cc revision ef7d42fca18c16fbaf103822ad16f23246e2905d
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 "vmap_table.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74bool Thread::is_started_ = false; 75pthread_key_t Thread::pthread_key_self_; 76ConditionVariable* Thread::resume_cond_ = nullptr; 77 78static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 79 80void Thread::InitCardTable() { 81 card_table_ = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 82} 83 84#if !defined(__APPLE__) 85static void UnimplementedEntryPoint() { 86 UNIMPLEMENTED(FATAL); 87} 88#endif 89 90void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 91 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 92 93void Thread::InitTlsEntryPoints() { 94#if !defined(__APPLE__) // The Mac GCC is too old to accept this code. 95 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 96 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 97 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(quick_entrypoints_)); 98 for (uintptr_t* it = begin; it != end; ++it) { 99 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 100 } 101 begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 102 end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(portable_entrypoints_)); 103 for (uintptr_t* it = begin; it != end; ++it) { 104 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 105 } 106#endif 107 InitEntryPoints(&interpreter_entrypoints_, &jni_entrypoints_, &portable_entrypoints_, 108 &quick_entrypoints_); 109} 110 111void ResetQuickAllocEntryPoints(QuickEntryPoints* qpoints); 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 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 402 SetBoolean(opeer_, thread_is_daemon); 403 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 404 SetObject(opeer_, soa.Decode<mirror::Object*>(thread_group)); 405 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 406 SetObject(opeer_, soa.Decode<mirror::Object*>(thread_name.get())); 407 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 408 SetInt(opeer_, thread_priority); 409 peer_thread_name.reset(GetThreadName(soa)); 410 } 411 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 412 if (peer_thread_name.get() != nullptr) { 413 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 414 } 415} 416 417void Thread::SetThreadName(const char* name) { 418 name_->assign(name); 419 ::art::SetThreadName(name); 420 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 421} 422 423void Thread::InitStackHwm() { 424 void* stack_base; 425 size_t stack_size; 426 GetThreadStack(pthread_self_, &stack_base, &stack_size); 427 428 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 429 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", stack_base, PrettySize(stack_size).c_str()); 430 431 stack_begin_ = reinterpret_cast<byte*>(stack_base); 432 stack_size_ = stack_size; 433 434 if (stack_size_ <= kStackOverflowReservedBytes) { 435 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << stack_size_ << " bytes)"; 436 } 437 438 // TODO: move this into the Linux GetThreadStack implementation. 439#if !defined(__APPLE__) 440 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 441 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 442 // will be broken because we'll die long before we get close to 2GB. 443 bool is_main_thread = (::art::GetTid() == getpid()); 444 if (is_main_thread) { 445 rlimit stack_limit; 446 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 447 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 448 } 449 if (stack_limit.rlim_cur == RLIM_INFINITY) { 450 // Find the default stack size for new threads... 451 pthread_attr_t default_attributes; 452 size_t default_stack_size; 453 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 454 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 455 "default stack size query"); 456 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 457 458 // ...and use that as our limit. 459 size_t old_stack_size = stack_size_; 460 stack_size_ = default_stack_size; 461 stack_begin_ += (old_stack_size - stack_size_); 462 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 463 << " to " << PrettySize(stack_size_) 464 << " with base " << reinterpret_cast<void*>(stack_begin_); 465 } 466 } 467#endif 468 469 // Set stack_end_ to the bottom of the stack saving space of stack overflows 470 ResetDefaultStackEnd(); 471 472 // Sanity check. 473 int stack_variable; 474 CHECK_GT(&stack_variable, reinterpret_cast<void*>(stack_end_)); 475} 476 477void Thread::ShortDump(std::ostream& os) const { 478 os << "Thread["; 479 if (GetThreadId() != 0) { 480 // If we're in kStarting, we won't have a thin lock id or tid yet. 481 os << GetThreadId() 482 << ",tid=" << GetTid() << ','; 483 } 484 os << GetState() 485 << ",Thread*=" << this 486 << ",peer=" << opeer_ 487 << ",\"" << *name_ << "\"" 488 << "]"; 489} 490 491void Thread::Dump(std::ostream& os) const { 492 DumpState(os); 493 DumpStack(os); 494} 495 496mirror::String* Thread::GetThreadName(const ScopedObjectAccessUnchecked& soa) const { 497 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 498 return (opeer_ != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(opeer_)) : nullptr; 499} 500 501void Thread::GetThreadName(std::string& name) const { 502 name.assign(*name_); 503} 504 505uint64_t Thread::GetCpuMicroTime() const { 506#if defined(HAVE_POSIX_CLOCKS) 507 clockid_t cpu_clock_id; 508 pthread_getcpuclockid(pthread_self_, &cpu_clock_id); 509 timespec now; 510 clock_gettime(cpu_clock_id, &now); 511 return static_cast<uint64_t>(now.tv_sec) * 1000000LL + now.tv_nsec / 1000LL; 512#else 513 UNIMPLEMENTED(WARNING); 514 return -1; 515#endif 516} 517 518void Thread::AtomicSetFlag(ThreadFlag flag) { 519 android_atomic_or(flag, &state_and_flags_.as_int); 520} 521 522void Thread::AtomicClearFlag(ThreadFlag flag) { 523 android_atomic_and(-1 ^ flag, &state_and_flags_.as_int); 524} 525 526// Attempt to rectify locks so that we dump thread list with required locks before exiting. 527static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 528 LOG(ERROR) << *thread << " suspend count already zero."; 529 Locks::thread_suspend_count_lock_->Unlock(self); 530 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 531 Locks::mutator_lock_->SharedTryLock(self); 532 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 533 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 534 } 535 } 536 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 537 Locks::thread_list_lock_->TryLock(self); 538 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 539 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 540 } 541 } 542 std::ostringstream ss; 543 Runtime::Current()->GetThreadList()->DumpLocked(ss); 544 LOG(FATAL) << ss.str(); 545} 546 547void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 548 DCHECK(delta == -1 || delta == +1 || delta == -debug_suspend_count_) 549 << delta << " " << debug_suspend_count_ << " " << this; 550 DCHECK_GE(suspend_count_, debug_suspend_count_) << this; 551 Locks::thread_suspend_count_lock_->AssertHeld(self); 552 if (this != self && !IsSuspended()) { 553 Locks::thread_list_lock_->AssertHeld(self); 554 } 555 if (UNLIKELY(delta < 0 && suspend_count_ <= 0)) { 556 UnsafeLogFatalForSuspendCount(self, this); 557 return; 558 } 559 560 suspend_count_ += delta; 561 if (for_debugger) { 562 debug_suspend_count_ += delta; 563 } 564 565 if (suspend_count_ == 0) { 566 AtomicClearFlag(kSuspendRequest); 567 } else { 568 AtomicSetFlag(kSuspendRequest); 569 } 570} 571 572void Thread::RunCheckpointFunction() { 573 Closure *checkpoints[kMaxCheckpoints]; 574 575 // Grab the suspend_count lock and copy the current set of 576 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 577 // function will also grab this lock so we prevent a race between setting 578 // the kCheckpointRequest flag and clearing it. 579 { 580 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 581 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 582 checkpoints[i] = checkpoint_functions_[i]; 583 checkpoint_functions_[i] = nullptr; 584 } 585 AtomicClearFlag(kCheckpointRequest); 586 } 587 588 // Outside the lock, run all the checkpoint functions that 589 // we collected. 590 bool found_checkpoint = false; 591 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 592 if (checkpoints[i] != nullptr) { 593 ATRACE_BEGIN("Checkpoint function"); 594 checkpoints[i]->Run(this); 595 ATRACE_END(); 596 found_checkpoint = true; 597 } 598 } 599 CHECK(found_checkpoint); 600} 601 602bool Thread::RequestCheckpoint(Closure* function) { 603 union StateAndFlags old_state_and_flags; 604 old_state_and_flags.as_int = state_and_flags_.as_int; 605 if (old_state_and_flags.as_struct.state != kRunnable) { 606 return false; // Fail, thread is suspended and so can't run a checkpoint. 607 } 608 609 uint32_t available_checkpoint = kMaxCheckpoints; 610 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 611 if (checkpoint_functions_[i] == nullptr) { 612 available_checkpoint = i; 613 break; 614 } 615 } 616 if (available_checkpoint == kMaxCheckpoints) { 617 // No checkpoint functions available, we can't run a checkpoint 618 return false; 619 } 620 checkpoint_functions_[available_checkpoint] = function; 621 622 // Checkpoint function installed now install flag bit. 623 // We must be runnable to request a checkpoint. 624 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 625 union StateAndFlags new_state_and_flags; 626 new_state_and_flags.as_int = old_state_and_flags.as_int; 627 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 628 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 629 &state_and_flags_.as_int); 630 if (UNLIKELY(succeeded != 0)) { 631 // The thread changed state before the checkpoint was installed. 632 CHECK_EQ(checkpoint_functions_[available_checkpoint], function); 633 checkpoint_functions_[available_checkpoint] = nullptr; 634 } else { 635 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 636 } 637 return succeeded == 0; 638} 639 640void Thread::FullSuspendCheck() { 641 VLOG(threads) << this << " self-suspending"; 642 ATRACE_BEGIN("Full suspend check"); 643 // Make thread appear suspended to other threads, release mutator_lock_. 644 TransitionFromRunnableToSuspended(kSuspended); 645 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 646 TransitionFromSuspendedToRunnable(); 647 ATRACE_END(); 648 VLOG(threads) << this << " self-reviving"; 649} 650 651void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 652 std::string group_name; 653 int priority; 654 bool is_daemon = false; 655 Thread* self = Thread::Current(); 656 657 if (self != nullptr && thread != nullptr && thread->opeer_ != nullptr) { 658 ScopedObjectAccessUnchecked soa(self); 659 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)->GetInt(thread->opeer_); 660 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)->GetBoolean(thread->opeer_); 661 662 mirror::Object* thread_group = 663 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->opeer_); 664 665 if (thread_group != nullptr) { 666 mirror::ArtField* group_name_field = 667 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 668 mirror::String* group_name_string = 669 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 670 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 671 } 672 } else { 673 priority = GetNativePriority(); 674 } 675 676 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 677 if (scheduler_group_name.empty()) { 678 scheduler_group_name = "default"; 679 } 680 681 if (thread != nullptr) { 682 os << '"' << *thread->name_ << '"'; 683 if (is_daemon) { 684 os << " daemon"; 685 } 686 os << " prio=" << priority 687 << " tid=" << thread->GetThreadId() 688 << " " << thread->GetState(); 689 if (thread->IsStillStarting()) { 690 os << " (still starting up)"; 691 } 692 os << "\n"; 693 } else { 694 os << '"' << ::art::GetThreadName(tid) << '"' 695 << " prio=" << priority 696 << " (not attached)\n"; 697 } 698 699 if (thread != nullptr) { 700 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 701 os << " | group=\"" << group_name << "\"" 702 << " sCount=" << thread->suspend_count_ 703 << " dsCount=" << thread->debug_suspend_count_ 704 << " obj=" << reinterpret_cast<void*>(thread->opeer_) 705 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 706 } 707 708 os << " | sysTid=" << tid 709 << " nice=" << getpriority(PRIO_PROCESS, tid) 710 << " cgrp=" << scheduler_group_name; 711 if (thread != nullptr) { 712 int policy; 713 sched_param sp; 714 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->pthread_self_, &policy, &sp), __FUNCTION__); 715 os << " sched=" << policy << "/" << sp.sched_priority 716 << " handle=" << reinterpret_cast<void*>(thread->pthread_self_); 717 } 718 os << "\n"; 719 720 // Grab the scheduler stats for this thread. 721 std::string scheduler_stats; 722 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 723 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 724 } else { 725 scheduler_stats = "0 0 0"; 726 } 727 728 char native_thread_state = '?'; 729 int utime = 0; 730 int stime = 0; 731 int task_cpu = 0; 732 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 733 734 os << " | state=" << native_thread_state 735 << " schedstat=( " << scheduler_stats << " )" 736 << " utm=" << utime 737 << " stm=" << stime 738 << " core=" << task_cpu 739 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 740 if (thread != nullptr) { 741 os << " | stack=" << reinterpret_cast<void*>(thread->stack_begin_) << "-" << reinterpret_cast<void*>(thread->stack_end_) 742 << " stackSize=" << PrettySize(thread->stack_size_) << "\n"; 743 } 744} 745 746void Thread::DumpState(std::ostream& os) const { 747 Thread::DumpState(os, this, GetTid()); 748} 749 750struct StackDumpVisitor : public StackVisitor { 751 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 752 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 753 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 754 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 755 } 756 757 virtual ~StackDumpVisitor() { 758 if (frame_count == 0) { 759 os << " (no managed stack frames)\n"; 760 } 761 } 762 763 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 764 mirror::ArtMethod* m = GetMethod(); 765 if (m->IsRuntimeMethod()) { 766 return true; 767 } 768 const int kMaxRepetition = 3; 769 mirror::Class* c = m->GetDeclaringClass(); 770 mirror::DexCache* dex_cache = c->GetDexCache(); 771 int line_number = -1; 772 if (dex_cache != nullptr) { // be tolerant of bad input 773 const DexFile& dex_file = *dex_cache->GetDexFile(); 774 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 775 } 776 if (line_number == last_line_number && last_method == m) { 777 ++repetition_count; 778 } else { 779 if (repetition_count >= kMaxRepetition) { 780 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 781 } 782 repetition_count = 0; 783 last_line_number = line_number; 784 last_method = m; 785 } 786 if (repetition_count < kMaxRepetition) { 787 os << " at " << PrettyMethod(m, false); 788 if (m->IsNative()) { 789 os << "(Native method)"; 790 } else { 791 mh.ChangeMethod(m); 792 const char* source_file(mh.GetDeclaringClassSourceFile()); 793 os << "(" << (source_file != nullptr ? source_file : "unavailable") 794 << ":" << line_number << ")"; 795 } 796 os << "\n"; 797 if (frame_count == 0) { 798 Monitor::DescribeWait(os, thread); 799 } 800 if (can_allocate) { 801 Monitor::VisitLocks(this, DumpLockedObject, &os); 802 } 803 } 804 805 ++frame_count; 806 return true; 807 } 808 809 static void DumpLockedObject(mirror::Object* o, void* context) 810 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 811 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 812 os << " - locked <" << o << "> (a " << PrettyTypeOf(o) << ")\n"; 813 } 814 815 std::ostream& os; 816 const Thread* thread; 817 const bool can_allocate; 818 MethodHelper mh; 819 mirror::ArtMethod* last_method; 820 int last_line_number; 821 int repetition_count; 822 int frame_count; 823}; 824 825static bool ShouldShowNativeStack(const Thread* thread) 826 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 827 ThreadState state = thread->GetState(); 828 829 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 830 if (state > kWaiting && state < kStarting) { 831 return true; 832 } 833 834 // In an Object.wait variant or Thread.sleep? That's not interesting. 835 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 836 return false; 837 } 838 839 // In some other native method? That's interesting. 840 // We don't just check kNative because native methods will be in state kSuspended if they're 841 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 842 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 843 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 844 return current_method != nullptr && current_method->IsNative(); 845} 846 847void Thread::DumpStack(std::ostream& os) const { 848 // TODO: we call this code when dying but may not have suspended the thread ourself. The 849 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 850 // the race with the thread_suspend_count_lock_). 851 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 852 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 853 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 854 // If we're currently in native code, dump that stack before dumping the managed stack. 855 if (dump_for_abort || ShouldShowNativeStack(this)) { 856 DumpKernelStack(os, GetTid(), " kernel: ", false); 857 DumpNativeStack(os, GetTid(), " native: ", false); 858 } 859 UniquePtr<Context> context(Context::Create()); 860 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), !throwing_OutOfMemoryError_); 861 dumper.WalkStack(); 862 } else { 863 os << "Not able to dump stack of thread that isn't suspended"; 864 } 865} 866 867void Thread::ThreadExitCallback(void* arg) { 868 Thread* self = reinterpret_cast<Thread*>(arg); 869 if (self->thread_exit_check_count_ == 0) { 870 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's going to use a pthread_key_create destructor?): " << *self; 871 CHECK(is_started_); 872 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 873 self->thread_exit_check_count_ = 1; 874 } else { 875 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 876 } 877} 878 879void Thread::Startup() { 880 CHECK(!is_started_); 881 is_started_ = true; 882 { 883 // MutexLock to keep annotalysis happy. 884 // 885 // Note we use nullptr for the thread because Thread::Current can 886 // return garbage since (is_started_ == true) and 887 // Thread::pthread_key_self_ is not yet initialized. 888 // This was seen on glibc. 889 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 890 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 891 *Locks::thread_suspend_count_lock_); 892 } 893 894 // Allocate a TLS slot. 895 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 896 897 // Double-check the TLS slot allocation. 898 if (pthread_getspecific(pthread_key_self_) != nullptr) { 899 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 900 } 901} 902 903void Thread::FinishStartup() { 904 Runtime* runtime = Runtime::Current(); 905 CHECK(runtime->IsStarted()); 906 907 // Finish attaching the main thread. 908 ScopedObjectAccess soa(Thread::Current()); 909 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 910 911 Runtime::Current()->GetClassLinker()->RunRootClinits(); 912} 913 914void Thread::Shutdown() { 915 CHECK(is_started_); 916 is_started_ = false; 917 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 918 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 919 if (resume_cond_ != nullptr) { 920 delete resume_cond_; 921 resume_cond_ = nullptr; 922 } 923} 924 925Thread::Thread(bool daemon) 926 : suspend_count_(0), 927 card_table_(nullptr), 928 exception_(nullptr), 929 stack_end_(nullptr), 930 managed_stack_(), 931 jni_env_(nullptr), 932 self_(nullptr), 933 opeer_(nullptr), 934 jpeer_(nullptr), 935 stack_begin_(nullptr), 936 stack_size_(0), 937 thin_lock_thread_id_(0), 938 stack_trace_sample_(nullptr), 939 trace_clock_base_(0), 940 tid_(0), 941 wait_mutex_(new Mutex("a thread wait mutex")), 942 wait_cond_(new ConditionVariable("a thread wait condition variable", *wait_mutex_)), 943 wait_monitor_(nullptr), 944 interrupted_(false), 945 wait_next_(nullptr), 946 monitor_enter_object_(nullptr), 947 top_sirt_(nullptr), 948 runtime_(nullptr), 949 class_loader_override_(nullptr), 950 long_jump_context_(nullptr), 951 throwing_OutOfMemoryError_(false), 952 debug_suspend_count_(0), 953 debug_invoke_req_(new DebugInvokeReq), 954 single_step_control_(new SingleStepControl), 955 deoptimization_shadow_frame_(nullptr), 956 instrumentation_stack_(new std::deque<instrumentation::InstrumentationStackFrame>), 957 name_(new std::string(kThreadNameDuringStartup)), 958 daemon_(daemon), 959 pthread_self_(0), 960 no_thread_suspension_(0), 961 last_no_thread_suspension_cause_(nullptr), 962 thread_exit_check_count_(0), 963 thread_local_start_(nullptr), 964 thread_local_pos_(nullptr), 965 thread_local_end_(nullptr), 966 thread_local_objects_(0) { 967 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 968 state_and_flags_.as_struct.flags = 0; 969 state_and_flags_.as_struct.state = kNative; 970 memset(&held_mutexes_[0], 0, sizeof(held_mutexes_)); 971 memset(rosalloc_runs_, 0, sizeof(rosalloc_runs_)); 972 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 973 checkpoint_functions_[i] = nullptr; 974 } 975} 976 977bool Thread::IsStillStarting() const { 978 // You might think you can check whether the state is kStarting, but for much of thread startup, 979 // the thread is in kNative; it might also be in kVmWait. 980 // You might think you can check whether the peer is nullptr, but the peer is actually created and 981 // assigned fairly early on, and needs to be. 982 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 983 // this thread _ever_ entered kRunnable". 984 return (jpeer_ == nullptr && opeer_ == nullptr) || (*name_ == kThreadNameDuringStartup); 985} 986 987void Thread::AssertNoPendingException() const { 988 if (UNLIKELY(IsExceptionPending())) { 989 ScopedObjectAccess soa(Thread::Current()); 990 mirror::Throwable* exception = GetException(nullptr); 991 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 992 } 993} 994 995static mirror::Object* MonitorExitVisitor(mirror::Object* object, void* arg) 996 NO_THREAD_SAFETY_ANALYSIS { 997 Thread* self = reinterpret_cast<Thread*>(arg); 998 mirror::Object* entered_monitor = object; 999 if (self->HoldsLock(entered_monitor)) { 1000 LOG(WARNING) << "Calling MonitorExit on object " 1001 << object << " (" << PrettyTypeOf(object) << ")" 1002 << " left locked by native thread " 1003 << *Thread::Current() << " which is detaching"; 1004 entered_monitor->MonitorExit(self); 1005 } 1006 return object; 1007} 1008 1009void Thread::Destroy() { 1010 Thread* self = this; 1011 DCHECK_EQ(self, Thread::Current()); 1012 1013 if (opeer_ != nullptr) { 1014 ScopedObjectAccess soa(self); 1015 // We may need to call user-supplied managed code, do this before final clean-up. 1016 HandleUncaughtExceptions(soa); 1017 RemoveFromThreadGroup(soa); 1018 1019 // this.nativePeer = 0; 1020 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetLong(opeer_, 0); 1021 Dbg::PostThreadDeath(self); 1022 1023 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1024 // who is waiting. 1025 mirror::Object* lock = 1026 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 1027 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1028 if (lock != nullptr) { 1029 SirtRef<mirror::Object> sirt_obj(self, lock); 1030 ObjectLock<mirror::Object> locker(self, &sirt_obj); 1031 locker.Notify(); 1032 } 1033 } 1034 1035 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1036 if (jni_env_ != nullptr) { 1037 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self); 1038 } 1039} 1040 1041Thread::~Thread() { 1042 if (jni_env_ != nullptr && jpeer_ != nullptr) { 1043 // If pthread_create fails we don't have a jni env here. 1044 jni_env_->DeleteGlobalRef(jpeer_); 1045 jpeer_ = nullptr; 1046 } 1047 opeer_ = nullptr; 1048 1049 bool initialized = (jni_env_ != nullptr); // Did Thread::Init run? 1050 if (initialized) { 1051 delete jni_env_; 1052 jni_env_ = nullptr; 1053 } 1054 CHECK_NE(GetState(), kRunnable); 1055 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1056 CHECK(checkpoint_functions_[0] == nullptr); 1057 CHECK(checkpoint_functions_[1] == nullptr); 1058 CHECK(checkpoint_functions_[2] == nullptr); 1059 1060 // We may be deleting a still born thread. 1061 SetStateUnsafe(kTerminated); 1062 1063 delete wait_cond_; 1064 delete wait_mutex_; 1065 1066 if (long_jump_context_ != nullptr) { 1067 delete long_jump_context_; 1068 } 1069 1070 if (initialized) { 1071 CleanupCpu(); 1072 } 1073 1074 delete debug_invoke_req_; 1075 delete single_step_control_; 1076 delete instrumentation_stack_; 1077 delete name_; 1078 delete stack_trace_sample_; 1079 1080 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1081 1082 TearDownAlternateSignalStack(); 1083} 1084 1085void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1086 if (!IsExceptionPending()) { 1087 return; 1088 } 1089 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1090 ScopedThreadStateChange tsc(this, kNative); 1091 1092 // Get and clear the exception. 1093 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1094 jni_env_->ExceptionClear(); 1095 1096 // If the thread has its own handler, use that. 1097 ScopedLocalRef<jobject> handler(jni_env_, 1098 jni_env_->GetObjectField(peer.get(), 1099 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1100 if (handler.get() == nullptr) { 1101 // Otherwise use the thread group's default handler. 1102 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1103 } 1104 1105 // Call the handler. 1106 jni_env_->CallVoidMethod(handler.get(), 1107 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1108 peer.get(), exception.get()); 1109 1110 // If the handler threw, clear that exception too. 1111 jni_env_->ExceptionClear(); 1112} 1113 1114void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1115 // this.group.removeThread(this); 1116 // group can be null if we're in the compiler or a test. 1117 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1118 if (ogroup != nullptr) { 1119 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1120 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1121 ScopedThreadStateChange tsc(soa.Self(), kNative); 1122 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1123 peer.get()); 1124 } 1125} 1126 1127size_t Thread::NumSirtReferences() { 1128 size_t count = 0; 1129 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1130 count += cur->NumberOfReferences(); 1131 } 1132 return count; 1133} 1134 1135bool Thread::SirtContains(jobject obj) const { 1136 StackReference<mirror::Object>* sirt_entry = 1137 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1138 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1139 if (cur->Contains(sirt_entry)) { 1140 return true; 1141 } 1142 } 1143 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1144 return managed_stack_.ShadowFramesContain(sirt_entry); 1145} 1146 1147void Thread::SirtVisitRoots(RootVisitor* visitor, void* arg) { 1148 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1149 size_t num_refs = cur->NumberOfReferences(); 1150 for (size_t j = 0; j < num_refs; ++j) { 1151 mirror::Object* object = cur->GetReference(j); 1152 if (object != nullptr) { 1153 const mirror::Object* new_obj = visitor(object, arg); 1154 DCHECK(new_obj != nullptr); 1155 if (new_obj != object) { 1156 cur->SetReference(j, const_cast<mirror::Object*>(new_obj)); 1157 } 1158 } 1159 } 1160 } 1161} 1162 1163mirror::Object* Thread::DecodeJObject(jobject obj) const { 1164 Locks::mutator_lock_->AssertSharedHeld(this); 1165 if (obj == nullptr) { 1166 return nullptr; 1167 } 1168 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1169 IndirectRefKind kind = GetIndirectRefKind(ref); 1170 mirror::Object* result; 1171 // The "kinds" below are sorted by the frequency we expect to encounter them. 1172 if (kind == kLocal) { 1173 IndirectReferenceTable& locals = jni_env_->locals; 1174 result = const_cast<mirror::Object*>(locals.Get(ref)); 1175 } else if (kind == kSirtOrInvalid) { 1176 // TODO: make stack indirect reference table lookup more efficient. 1177 // Check if this is a local reference in the SIRT. 1178 if (LIKELY(SirtContains(obj))) { 1179 // Read from SIRT. 1180 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1181 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1182 // Assume an invalid local reference is actually a direct pointer. 1183 result = reinterpret_cast<mirror::Object*>(obj); 1184 } else { 1185 result = kInvalidIndirectRefObject; 1186 } 1187 } else if (kind == kGlobal) { 1188 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1189 IndirectReferenceTable& globals = vm->globals; 1190 ReaderMutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1191 result = const_cast<mirror::Object*>(globals.Get(ref)); 1192 } else { 1193 DCHECK_EQ(kind, kWeakGlobal); 1194 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1195 if (result == kClearedJniWeakGlobal) { 1196 // This is a special case where it's okay to return nullptr. 1197 return nullptr; 1198 } 1199 } 1200 1201 if (UNLIKELY(result == nullptr)) { 1202 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1203 } else { 1204 if (kIsDebugBuild && (result != kInvalidIndirectRefObject)) { 1205 Runtime::Current()->GetHeap()->VerifyObject(result); 1206 } 1207 } 1208 return result; 1209} 1210 1211// Implements java.lang.Thread.interrupted. 1212bool Thread::Interrupted() { 1213 MutexLock mu(Thread::Current(), *wait_mutex_); 1214 bool interrupted = interrupted_; 1215 interrupted_ = false; 1216 return interrupted; 1217} 1218 1219// Implements java.lang.Thread.isInterrupted. 1220bool Thread::IsInterrupted() { 1221 MutexLock mu(Thread::Current(), *wait_mutex_); 1222 return interrupted_; 1223} 1224 1225void Thread::Interrupt() { 1226 Thread* self = Thread::Current(); 1227 MutexLock mu(self, *wait_mutex_); 1228 if (interrupted_) { 1229 return; 1230 } 1231 interrupted_ = true; 1232 NotifyLocked(self); 1233} 1234 1235void Thread::Notify() { 1236 Thread* self = Thread::Current(); 1237 MutexLock mu(self, *wait_mutex_); 1238 NotifyLocked(self); 1239} 1240 1241void Thread::NotifyLocked(Thread* self) { 1242 if (wait_monitor_ != nullptr) { 1243 wait_cond_->Signal(self); 1244 } 1245} 1246 1247class CountStackDepthVisitor : public StackVisitor { 1248 public: 1249 explicit CountStackDepthVisitor(Thread* thread) 1250 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1251 : StackVisitor(thread, nullptr), 1252 depth_(0), skip_depth_(0), skipping_(true) {} 1253 1254 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1255 // We want to skip frames up to and including the exception's constructor. 1256 // Note we also skip the frame if it doesn't have a method (namely the callee 1257 // save frame) 1258 mirror::ArtMethod* m = GetMethod(); 1259 if (skipping_ && !m->IsRuntimeMethod() && 1260 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1261 skipping_ = false; 1262 } 1263 if (!skipping_) { 1264 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1265 ++depth_; 1266 } 1267 } else { 1268 ++skip_depth_; 1269 } 1270 return true; 1271 } 1272 1273 int GetDepth() const { 1274 return depth_; 1275 } 1276 1277 int GetSkipDepth() const { 1278 return skip_depth_; 1279 } 1280 1281 private: 1282 uint32_t depth_; 1283 uint32_t skip_depth_; 1284 bool skipping_; 1285}; 1286 1287class BuildInternalStackTraceVisitor : public StackVisitor { 1288 public: 1289 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1290 : StackVisitor(thread, nullptr), self_(self), 1291 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1292 1293 bool Init(int depth) 1294 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1295 // Allocate method trace with an extra slot that will hold the PC trace 1296 SirtRef<mirror::ObjectArray<mirror::Object> > 1297 method_trace(self_, 1298 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1299 depth + 1)); 1300 if (method_trace.get() == nullptr) { 1301 return false; 1302 } 1303 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1304 if (dex_pc_trace == nullptr) { 1305 return false; 1306 } 1307 // Save PC trace in last element of method trace, also places it into the 1308 // object graph. 1309 method_trace->Set(depth, dex_pc_trace); 1310 // Set the Object*s and assert that no thread suspension is now possible. 1311 const char* last_no_suspend_cause = 1312 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1313 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1314 method_trace_ = method_trace.get(); 1315 dex_pc_trace_ = dex_pc_trace; 1316 return true; 1317 } 1318 1319 virtual ~BuildInternalStackTraceVisitor() { 1320 if (method_trace_ != nullptr) { 1321 self_->EndAssertNoThreadSuspension(nullptr); 1322 } 1323 } 1324 1325 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1326 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1327 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1328 } 1329 if (skip_depth_ > 0) { 1330 skip_depth_--; 1331 return true; 1332 } 1333 mirror::ArtMethod* m = GetMethod(); 1334 if (m->IsRuntimeMethod()) { 1335 return true; // Ignore runtime frames (in particular callee save). 1336 } 1337 method_trace_->Set(count_, m); 1338 dex_pc_trace_->Set(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1339 ++count_; 1340 return true; 1341 } 1342 1343 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1344 return method_trace_; 1345 } 1346 1347 private: 1348 Thread* const self_; 1349 // How many more frames to skip. 1350 int32_t skip_depth_; 1351 // Current position down stack trace. 1352 uint32_t count_; 1353 // Array of dex PC values. 1354 mirror::IntArray* dex_pc_trace_; 1355 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1356 mirror::ObjectArray<mirror::Object>* method_trace_; 1357}; 1358 1359jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1360 // Compute depth of stack 1361 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1362 count_visitor.WalkStack(); 1363 int32_t depth = count_visitor.GetDepth(); 1364 int32_t skip_depth = count_visitor.GetSkipDepth(); 1365 1366 // Build internal stack trace. 1367 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1368 skip_depth); 1369 if (!build_trace_visitor.Init(depth)) { 1370 return nullptr; // Allocation failed. 1371 } 1372 build_trace_visitor.WalkStack(); 1373 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1374 if (kIsDebugBuild) { 1375 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1376 CHECK(trace->Get(i) != nullptr); 1377 } 1378 } 1379 return soa.AddLocalReference<jobjectArray>(trace); 1380} 1381 1382jobjectArray Thread::InternalStackTraceToStackTraceElementArray(JNIEnv* env, jobject internal, 1383 jobjectArray output_array, int* stack_depth) { 1384 // Transition into runnable state to work on Object*/Array* 1385 ScopedObjectAccess soa(env); 1386 // Decode the internal stack trace into the depth, method trace and PC trace 1387 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1388 1389 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1390 1391 jobjectArray result; 1392 1393 if (output_array != nullptr) { 1394 // Reuse the array we were given. 1395 result = output_array; 1396 // ...adjusting the number of frames we'll write to not exceed the array length. 1397 const int32_t traces_length = 1398 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1399 depth = std::min(depth, traces_length); 1400 } else { 1401 // Create java_trace array and place in local reference table 1402 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1403 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1404 if (java_traces == nullptr) { 1405 return nullptr; 1406 } 1407 result = soa.AddLocalReference<jobjectArray>(java_traces); 1408 } 1409 1410 if (stack_depth != nullptr) { 1411 *stack_depth = depth; 1412 } 1413 1414 for (int32_t i = 0; i < depth; ++i) { 1415 mirror::ObjectArray<mirror::Object>* method_trace = 1416 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1417 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1418 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1419 MethodHelper mh(method); 1420 int32_t line_number; 1421 SirtRef<mirror::String> class_name_object(soa.Self(), nullptr); 1422 SirtRef<mirror::String> source_name_object(soa.Self(), nullptr); 1423 if (method->IsProxyMethod()) { 1424 line_number = -1; 1425 class_name_object.reset(method->GetDeclaringClass()->GetName()); 1426 // source_name_object intentionally left null for proxy methods 1427 } else { 1428 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1429 uint32_t dex_pc = pc_trace->Get(i); 1430 line_number = mh.GetLineNumFromDexPC(dex_pc); 1431 // Allocate element, potentially triggering GC 1432 // TODO: reuse class_name_object via Class::name_? 1433 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1434 CHECK(descriptor != nullptr); 1435 std::string class_name(PrettyDescriptor(descriptor)); 1436 class_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1437 if (class_name_object.get() == nullptr) { 1438 return nullptr; 1439 } 1440 const char* source_file = mh.GetDeclaringClassSourceFile(); 1441 if (source_file != nullptr) { 1442 source_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1443 if (source_name_object.get() == nullptr) { 1444 return nullptr; 1445 } 1446 } 1447 } 1448 const char* method_name = mh.GetName(); 1449 CHECK(method_name != nullptr); 1450 SirtRef<mirror::String> method_name_object(soa.Self(), 1451 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1452 method_name)); 1453 if (method_name_object.get() == nullptr) { 1454 return nullptr; 1455 } 1456 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1457 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1458 if (obj == nullptr) { 1459 return nullptr; 1460 } 1461 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set(i, obj); 1462 } 1463 return result; 1464} 1465 1466void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1467 const char* exception_class_descriptor, const char* fmt, ...) { 1468 va_list args; 1469 va_start(args, fmt); 1470 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1471 fmt, args); 1472 va_end(args); 1473} 1474 1475void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1476 const char* exception_class_descriptor, 1477 const char* fmt, va_list ap) { 1478 std::string msg; 1479 StringAppendV(&msg, fmt, ap); 1480 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1481} 1482 1483void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1484 const char* msg) { 1485 AssertNoPendingException(); // Callers should either clear or call ThrowNewWrappedException. 1486 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1487} 1488 1489void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1490 const char* exception_class_descriptor, 1491 const char* msg) { 1492 DCHECK_EQ(this, Thread::Current()); 1493 // Ensure we don't forget arguments over object allocation. 1494 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1495 SirtRef<mirror::ArtMethod> saved_throw_method(this, throw_location.GetMethod()); 1496 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1497 SirtRef<mirror::Throwable> cause(this, GetException(nullptr)); 1498 ClearException(); 1499 Runtime* runtime = Runtime::Current(); 1500 1501 mirror::ClassLoader* cl = nullptr; 1502 if (saved_throw_method.get() != nullptr) { 1503 cl = saved_throw_method.get()->GetDeclaringClass()->GetClassLoader(); 1504 } 1505 SirtRef<mirror::ClassLoader> class_loader(this, cl); 1506 SirtRef<mirror::Class> 1507 exception_class(this, runtime->GetClassLinker()->FindClass(exception_class_descriptor, 1508 class_loader)); 1509 if (UNLIKELY(exception_class.get() == nullptr)) { 1510 CHECK(IsExceptionPending()); 1511 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1512 return; 1513 } 1514 1515 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1516 DCHECK(IsExceptionPending()); 1517 return; 1518 } 1519 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1520 SirtRef<mirror::Throwable> exception(this, 1521 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1522 1523 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1524 if (exception.get() == nullptr) { 1525 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1526 throw_location.GetDexPc()); 1527 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1528 return; 1529 } 1530 1531 // Choose an appropriate constructor and set up the arguments. 1532 const char* signature; 1533 SirtRef<mirror::String> msg_string(this, nullptr); 1534 if (msg != nullptr) { 1535 // Ensure we remember this and the method over the String allocation. 1536 msg_string.reset(mirror::String::AllocFromModifiedUtf8(this, msg)); 1537 if (UNLIKELY(msg_string.get() == nullptr)) { 1538 CHECK(IsExceptionPending()); // OOME. 1539 return; 1540 } 1541 if (cause.get() == nullptr) { 1542 signature = "(Ljava/lang/String;)V"; 1543 } else { 1544 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1545 } 1546 } else { 1547 if (cause.get() == nullptr) { 1548 signature = "()V"; 1549 } else { 1550 signature = "(Ljava/lang/Throwable;)V"; 1551 } 1552 } 1553 mirror::ArtMethod* exception_init_method = 1554 exception_class->FindDeclaredDirectMethod("<init>", signature); 1555 1556 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1557 << PrettyDescriptor(exception_class_descriptor); 1558 1559 if (UNLIKELY(!runtime->IsStarted())) { 1560 // Something is trying to throw an exception without a started runtime, which is the common 1561 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1562 // the exception fields directly. 1563 if (msg != nullptr) { 1564 exception->SetDetailMessage(msg_string.get()); 1565 } 1566 if (cause.get() != nullptr) { 1567 exception->SetCause(cause.get()); 1568 } 1569 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1570 throw_location.GetDexPc()); 1571 SetException(gc_safe_throw_location, exception.get()); 1572 } else { 1573 ArgArray args("VLL", 3); 1574 args.Append(exception.get()); 1575 if (msg != nullptr) { 1576 args.Append(msg_string.get()); 1577 } 1578 if (cause.get() != nullptr) { 1579 args.Append(cause.get()); 1580 } 1581 JValue result; 1582 exception_init_method->Invoke(this, args.GetArray(), args.GetNumBytes(), &result, 'V'); 1583 if (LIKELY(!IsExceptionPending())) { 1584 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1585 throw_location.GetDexPc()); 1586 SetException(gc_safe_throw_location, exception.get()); 1587 } 1588 } 1589} 1590 1591void Thread::ThrowOutOfMemoryError(const char* msg) { 1592 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1593 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1594 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1595 if (!throwing_OutOfMemoryError_) { 1596 throwing_OutOfMemoryError_ = true; 1597 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1598 throwing_OutOfMemoryError_ = false; 1599 } else { 1600 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1601 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1602 } 1603} 1604 1605Thread* Thread::CurrentFromGdb() { 1606 return Thread::Current(); 1607} 1608 1609void Thread::DumpFromGdb() const { 1610 std::ostringstream ss; 1611 Dump(ss); 1612 std::string str(ss.str()); 1613 // log to stderr for debugging command line processes 1614 std::cerr << str; 1615#ifdef HAVE_ANDROID_OS 1616 // log to logcat for debugging frameworks processes 1617 LOG(INFO) << str; 1618#endif 1619} 1620 1621struct EntryPointInfo { 1622 uint32_t offset; 1623 const char* name; 1624}; 1625#define INTERPRETER_ENTRY_POINT_INFO(x) { INTERPRETER_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1626#define JNI_ENTRY_POINT_INFO(x) { JNI_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1627#define PORTABLE_ENTRY_POINT_INFO(x) { PORTABLE_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1628#define QUICK_ENTRY_POINT_INFO(x) { QUICK_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1629static const EntryPointInfo gThreadEntryPointInfo[] = { 1630 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge), 1631 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge), 1632 JNI_ENTRY_POINT_INFO(pDlsymLookup), 1633 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline), 1634 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline), 1635 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge), 1636 QUICK_ENTRY_POINT_INFO(pAllocArray), 1637 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved), 1638 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck), 1639 QUICK_ENTRY_POINT_INFO(pAllocObject), 1640 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved), 1641 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized), 1642 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck), 1643 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray), 1644 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck), 1645 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial), 1646 QUICK_ENTRY_POINT_INFO(pCheckCast), 1647 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage), 1648 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess), 1649 QUICK_ENTRY_POINT_INFO(pInitializeType), 1650 QUICK_ENTRY_POINT_INFO(pResolveString), 1651 QUICK_ENTRY_POINT_INFO(pSet32Instance), 1652 QUICK_ENTRY_POINT_INFO(pSet32Static), 1653 QUICK_ENTRY_POINT_INFO(pSet64Instance), 1654 QUICK_ENTRY_POINT_INFO(pSet64Static), 1655 QUICK_ENTRY_POINT_INFO(pSetObjInstance), 1656 QUICK_ENTRY_POINT_INFO(pSetObjStatic), 1657 QUICK_ENTRY_POINT_INFO(pGet32Instance), 1658 QUICK_ENTRY_POINT_INFO(pGet32Static), 1659 QUICK_ENTRY_POINT_INFO(pGet64Instance), 1660 QUICK_ENTRY_POINT_INFO(pGet64Static), 1661 QUICK_ENTRY_POINT_INFO(pGetObjInstance), 1662 QUICK_ENTRY_POINT_INFO(pGetObjStatic), 1663 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck), 1664 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck), 1665 QUICK_ENTRY_POINT_INFO(pAputObject), 1666 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData), 1667 QUICK_ENTRY_POINT_INFO(pJniMethodStart), 1668 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1669 QUICK_ENTRY_POINT_INFO(pJniMethodEnd), 1670 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1671 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference), 1672 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1673 QUICK_ENTRY_POINT_INFO(pLockObject), 1674 QUICK_ENTRY_POINT_INFO(pUnlockObject), 1675 QUICK_ENTRY_POINT_INFO(pCmpgDouble), 1676 QUICK_ENTRY_POINT_INFO(pCmpgFloat), 1677 QUICK_ENTRY_POINT_INFO(pCmplDouble), 1678 QUICK_ENTRY_POINT_INFO(pCmplFloat), 1679 QUICK_ENTRY_POINT_INFO(pFmod), 1680 QUICK_ENTRY_POINT_INFO(pSqrt), 1681 QUICK_ENTRY_POINT_INFO(pL2d), 1682 QUICK_ENTRY_POINT_INFO(pFmodf), 1683 QUICK_ENTRY_POINT_INFO(pL2f), 1684 QUICK_ENTRY_POINT_INFO(pD2iz), 1685 QUICK_ENTRY_POINT_INFO(pF2iz), 1686 QUICK_ENTRY_POINT_INFO(pIdivmod), 1687 QUICK_ENTRY_POINT_INFO(pD2l), 1688 QUICK_ENTRY_POINT_INFO(pF2l), 1689 QUICK_ENTRY_POINT_INFO(pLdiv), 1690 QUICK_ENTRY_POINT_INFO(pLmod), 1691 QUICK_ENTRY_POINT_INFO(pLmul), 1692 QUICK_ENTRY_POINT_INFO(pShlLong), 1693 QUICK_ENTRY_POINT_INFO(pShrLong), 1694 QUICK_ENTRY_POINT_INFO(pUshrLong), 1695 QUICK_ENTRY_POINT_INFO(pIndexOf), 1696 QUICK_ENTRY_POINT_INFO(pMemcmp16), 1697 QUICK_ENTRY_POINT_INFO(pStringCompareTo), 1698 QUICK_ENTRY_POINT_INFO(pMemcpy), 1699 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline), 1700 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline), 1701 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge), 1702 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1703 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1704 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1705 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1706 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1707 QUICK_ENTRY_POINT_INFO(pCheckSuspend), 1708 QUICK_ENTRY_POINT_INFO(pTestSuspend), 1709 QUICK_ENTRY_POINT_INFO(pDeliverException), 1710 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds), 1711 QUICK_ENTRY_POINT_INFO(pThrowDivZero), 1712 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod), 1713 QUICK_ENTRY_POINT_INFO(pThrowNullPointer), 1714 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow), 1715}; 1716#undef QUICK_ENTRY_POINT_INFO 1717 1718void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1719 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1720 1721#define DO_THREAD_OFFSET(x) \ 1722 if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { \ 1723 os << # x; \ 1724 return; \ 1725 } 1726 DO_THREAD_OFFSET(state_and_flags_); 1727 DO_THREAD_OFFSET(card_table_); 1728 DO_THREAD_OFFSET(exception_); 1729 DO_THREAD_OFFSET(opeer_); 1730 DO_THREAD_OFFSET(jni_env_); 1731 DO_THREAD_OFFSET(self_); 1732 DO_THREAD_OFFSET(stack_end_); 1733 DO_THREAD_OFFSET(suspend_count_); 1734 DO_THREAD_OFFSET(thin_lock_thread_id_); 1735 // DO_THREAD_OFFSET(top_of_managed_stack_); 1736 // DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1737 DO_THREAD_OFFSET(top_sirt_); 1738#undef DO_THREAD_OFFSET 1739 1740 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1741 CHECK_EQ(entry_point_count * size_of_pointers, 1742 sizeof(InterpreterEntryPoints) + sizeof(JniEntryPoints) + sizeof(PortableEntryPoints) + 1743 sizeof(QuickEntryPoints)); 1744 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, interpreter_entrypoints_); 1745 for (size_t i = 0; i < entry_point_count; ++i) { 1746 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1747 expected_offset += size_of_pointers; 1748 if (gThreadEntryPointInfo[i].offset == offset) { 1749 os << gThreadEntryPointInfo[i].name; 1750 return; 1751 } 1752 } 1753 os << offset; 1754} 1755 1756void Thread::QuickDeliverException() { 1757 // Get exception from thread. 1758 ThrowLocation throw_location; 1759 mirror::Throwable* exception = GetException(&throw_location); 1760 CHECK(exception != nullptr); 1761 // Don't leave exception visible while we try to find the handler, which may cause class 1762 // resolution. 1763 ClearException(); 1764 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1765 if (kDebugExceptionDelivery) { 1766 if (!is_deoptimization) { 1767 mirror::String* msg = exception->GetDetailMessage(); 1768 std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : ""); 1769 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1770 << ": " << str_msg << "\n"); 1771 } else { 1772 DumpStack(LOG(INFO) << "Deoptimizing: "); 1773 } 1774 } 1775 CatchFinder catch_finder(this, throw_location, exception, is_deoptimization); 1776 catch_finder.FindCatch(); 1777 catch_finder.UpdateInstrumentationStack(); 1778 catch_finder.DoLongJump(); 1779 LOG(FATAL) << "UNREACHABLE"; 1780} 1781 1782Context* Thread::GetLongJumpContext() { 1783 Context* result = long_jump_context_; 1784 if (result == nullptr) { 1785 result = Context::Create(); 1786 } else { 1787 long_jump_context_ = nullptr; // Avoid context being shared. 1788 result->Reset(); 1789 } 1790 return result; 1791} 1792 1793struct CurrentMethodVisitor : public StackVisitor { 1794 CurrentMethodVisitor(Thread* thread, Context* context) 1795 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1796 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1797 virtual bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1798 mirror::ArtMethod* m = GetMethod(); 1799 if (m->IsRuntimeMethod()) { 1800 // Continue if this is a runtime method. 1801 return true; 1802 } 1803 if (context_ != nullptr) { 1804 this_object_ = GetThisObject(); 1805 } 1806 method_ = m; 1807 dex_pc_ = GetDexPc(); 1808 return false; 1809 } 1810 mirror::Object* this_object_; 1811 mirror::ArtMethod* method_; 1812 uint32_t dex_pc_; 1813}; 1814 1815mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1816 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1817 visitor.WalkStack(false); 1818 if (dex_pc != nullptr) { 1819 *dex_pc = visitor.dex_pc_; 1820 } 1821 return visitor.method_; 1822} 1823 1824ThrowLocation Thread::GetCurrentLocationForThrow() { 1825 Context* context = GetLongJumpContext(); 1826 CurrentMethodVisitor visitor(this, context); 1827 visitor.WalkStack(false); 1828 ReleaseLongJumpContext(context); 1829 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1830} 1831 1832bool Thread::HoldsLock(mirror::Object* object) { 1833 if (object == nullptr) { 1834 return false; 1835 } 1836 return object->GetLockOwnerThreadId() == thin_lock_thread_id_; 1837} 1838 1839// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1840template <typename RootVisitor> 1841class ReferenceMapVisitor : public StackVisitor { 1842 public: 1843 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1844 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1845 : StackVisitor(thread, context), visitor_(visitor) {} 1846 1847 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1848 if (false) { 1849 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1850 << StringPrintf("@ PC:%04x", GetDexPc()); 1851 } 1852 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1853 if (shadow_frame != nullptr) { 1854 mirror::ArtMethod* m = shadow_frame->GetMethod(); 1855 size_t num_regs = shadow_frame->NumberOfVRegs(); 1856 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1857 // SIRT for JNI or References for interpreter. 1858 for (size_t reg = 0; reg < num_regs; ++reg) { 1859 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1860 if (ref != nullptr) { 1861 mirror::Object* new_ref = visitor_(ref, reg, this); 1862 if (new_ref != ref) { 1863 shadow_frame->SetVRegReference(reg, new_ref); 1864 } 1865 } 1866 } 1867 } else { 1868 // Java method. 1869 // Portable path use DexGcMap and store in Method.native_gc_map_. 1870 const uint8_t* gc_map = m->GetNativeGcMap(); 1871 CHECK(gc_map != nullptr) << PrettyMethod(m); 1872 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 1873 uint32_t dex_pc = GetDexPc(); 1874 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 1875 DCHECK(reg_bitmap != nullptr); 1876 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 1877 for (size_t reg = 0; reg < num_regs; ++reg) { 1878 if (TestBitmap(reg, reg_bitmap)) { 1879 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1880 if (ref != nullptr) { 1881 mirror::Object* new_ref = visitor_(ref, reg, this); 1882 if (new_ref != ref) { 1883 shadow_frame->SetVRegReference(reg, new_ref); 1884 } 1885 } 1886 } 1887 } 1888 } 1889 } else { 1890 mirror::ArtMethod* m = GetMethod(); 1891 // Process register map (which native and runtime methods don't have) 1892 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 1893 const uint8_t* native_gc_map = m->GetNativeGcMap(); 1894 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 1895 mh_.ChangeMethod(m); 1896 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 1897 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 1898 NativePcOffsetToReferenceMap map(native_gc_map); 1899 size_t num_regs = std::min(map.RegWidth() * 8, 1900 static_cast<size_t>(code_item->registers_size_)); 1901 if (num_regs > 0) { 1902 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 1903 DCHECK(reg_bitmap != nullptr); 1904 const VmapTable vmap_table(m->GetVmapTable()); 1905 uint32_t core_spills = m->GetCoreSpillMask(); 1906 uint32_t fp_spills = m->GetFpSpillMask(); 1907 size_t frame_size = m->GetFrameSizeInBytes(); 1908 // For all dex registers in the bitmap 1909 mirror::ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 1910 DCHECK(cur_quick_frame != nullptr); 1911 for (size_t reg = 0; reg < num_regs; ++reg) { 1912 // Does this register hold a reference? 1913 if (TestBitmap(reg, reg_bitmap)) { 1914 uint32_t vmap_offset; 1915 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 1916 int vmap_reg = vmap_table.ComputeRegister(core_spills, vmap_offset, kReferenceVReg); 1917 mirror::Object* ref = reinterpret_cast<mirror::Object*>(GetGPR(vmap_reg)); 1918 if (ref != nullptr) { 1919 mirror::Object* new_ref = visitor_(ref, reg, this); 1920 if (ref != new_ref) { 1921 SetGPR(vmap_reg, reinterpret_cast<uintptr_t>(new_ref)); 1922 } 1923 } 1924 } else { 1925 uintptr_t* reg_addr = reinterpret_cast<uintptr_t*>( 1926 GetVRegAddr(cur_quick_frame, code_item, core_spills, fp_spills, frame_size, reg)); 1927 mirror::Object* ref = reinterpret_cast<mirror::Object*>(*reg_addr); 1928 if (ref != nullptr) { 1929 mirror::Object* new_ref = visitor_(ref, reg, this); 1930 if (ref != new_ref) { 1931 *reg_addr = reinterpret_cast<uintptr_t>(new_ref); 1932 } 1933 } 1934 } 1935 } 1936 } 1937 } 1938 } 1939 } 1940 return true; 1941 } 1942 1943 private: 1944 static bool TestBitmap(int reg, const uint8_t* reg_vector) { 1945 return ((reg_vector[reg / 8] >> (reg % 8)) & 0x01) != 0; 1946 } 1947 1948 // Visitor for when we visit a root. 1949 const RootVisitor& visitor_; 1950 1951 // A method helper we keep around to avoid dex file/cache re-computations. 1952 MethodHelper mh_; 1953}; 1954 1955class RootCallbackVisitor { 1956 public: 1957 RootCallbackVisitor(RootVisitor* visitor, void* arg) : visitor_(visitor), arg_(arg) {} 1958 1959 mirror::Object* operator()(mirror::Object* obj, size_t, const StackVisitor*) const { 1960 return visitor_(obj, arg_); 1961 } 1962 1963 private: 1964 RootVisitor* visitor_; 1965 void* arg_; 1966}; 1967 1968class VerifyCallbackVisitor { 1969 public: 1970 VerifyCallbackVisitor(VerifyRootVisitor* visitor, void* arg) 1971 : visitor_(visitor), 1972 arg_(arg) { 1973 } 1974 1975 void operator()(const mirror::Object* obj, size_t vreg, const StackVisitor* visitor) const { 1976 visitor_(obj, arg_, vreg, visitor); 1977 } 1978 1979 private: 1980 VerifyRootVisitor* const visitor_; 1981 void* const arg_; 1982}; 1983 1984void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 1985 if (kIsDebugBuild) { 1986 Runtime::Current()->GetHeap()->VerifyObject(class_loader_override); 1987 } 1988 class_loader_override_ = class_loader_override; 1989} 1990 1991void Thread::VisitRoots(RootVisitor* visitor, void* arg) { 1992 if (opeer_ != nullptr) { 1993 opeer_ = visitor(opeer_, arg); 1994 } 1995 if (exception_ != nullptr) { 1996 exception_ = down_cast<mirror::Throwable*>(visitor(exception_, arg)); 1997 } 1998 throw_location_.VisitRoots(visitor, arg); 1999 if (class_loader_override_ != nullptr) { 2000 class_loader_override_ = down_cast<mirror::ClassLoader*>(visitor(class_loader_override_, arg)); 2001 } 2002 jni_env_->locals.VisitRoots(visitor, arg); 2003 jni_env_->monitors.VisitRoots(visitor, arg); 2004 2005 SirtVisitRoots(visitor, arg); 2006 2007 // Visit roots on this thread's stack 2008 Context* context = GetLongJumpContext(); 2009 RootCallbackVisitor visitorToCallback(visitor, arg); 2010 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2011 mapper.WalkStack(); 2012 ReleaseLongJumpContext(context); 2013 2014 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2015 if (frame.this_object_ != nullptr) { 2016 frame.this_object_ = visitor(frame.this_object_, arg); 2017 } 2018 DCHECK(frame.method_ != nullptr); 2019 frame.method_ = down_cast<mirror::ArtMethod*>(visitor(frame.method_, arg)); 2020 } 2021} 2022 2023static mirror::Object* VerifyRoot(mirror::Object* root, void* arg) { 2024 DCHECK(root != nullptr); 2025 DCHECK(arg != nullptr); 2026 reinterpret_cast<gc::Heap*>(arg)->VerifyObject(root); 2027 return root; 2028} 2029 2030void Thread::VerifyStackImpl() { 2031 UniquePtr<Context> context(Context::Create()); 2032 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap()); 2033 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2034 mapper.WalkStack(); 2035} 2036 2037// Set the stack end to that to be used during a stack overflow 2038void Thread::SetStackEndForStackOverflow() { 2039 // During stack overflow we allow use of the full stack. 2040 if (stack_end_ == stack_begin_) { 2041 // However, we seem to have already extended to use the full stack. 2042 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2043 << kStackOverflowReservedBytes << ")?"; 2044 DumpStack(LOG(ERROR)); 2045 LOG(FATAL) << "Recursive stack overflow."; 2046 } 2047 2048 stack_end_ = stack_begin_; 2049} 2050 2051void Thread::SetTlab(byte* start, byte* end) { 2052 DCHECK_LE(start, end); 2053 thread_local_start_ = start; 2054 thread_local_pos_ = thread_local_start_; 2055 thread_local_end_ = end; 2056 thread_local_objects_ = 0; 2057} 2058 2059std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2060 thread.ShortDump(os); 2061 return os; 2062} 2063 2064} // namespace art 2065