thread.cc revision 93ba893c20532990a430741e0a97212900094e8c
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 "base/mutex.h" 34#include "class_linker.h" 35#include "class_linker-inl.h" 36#include "cutils/atomic.h" 37#include "cutils/atomic-inline.h" 38#include "debugger.h" 39#include "dex_file-inl.h" 40#include "gc_map.h" 41#include "gc/accounting/card_table-inl.h" 42#include "gc/heap.h" 43#include "gc/space/space.h" 44#include "invoke_arg_array_builder.h" 45#include "jni_internal.h" 46#include "mirror/abstract_method-inl.h" 47#include "mirror/class-inl.h" 48#include "mirror/class_loader.h" 49#include "mirror/field-inl.h" 50#include "mirror/object_array-inl.h" 51#include "mirror/stack_trace_element.h" 52#include "monitor.h" 53#include "oat/runtime/context.h" 54#include "object_utils.h" 55#include "reflection.h" 56#include "runtime.h" 57#include "runtime_support.h" 58#include "scoped_thread_state_change.h" 59#include "ScopedLocalRef.h" 60#include "ScopedUtfChars.h" 61#include "sirt_ref.h" 62#include "stack.h" 63#include "stack_indirect_reference_table.h" 64#include "thread-inl.h" 65#include "thread_list.h" 66#include "utils.h" 67#include "verifier/dex_gc_map.h" 68#include "verifier/method_verifier.h" 69#include "well_known_classes.h" 70 71namespace art { 72 73bool Thread::is_started_ = false; 74pthread_key_t Thread::pthread_key_self_; 75ConditionVariable* Thread::resume_cond_ = NULL; 76 77static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 78 79void Thread::InitCardTable() { 80 card_table_ = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 81} 82 83#if !defined(__APPLE__) 84static void UnimplementedEntryPoint() { 85 UNIMPLEMENTED(FATAL); 86} 87#endif 88 89void Thread::InitFunctionPointers() { 90#if !defined(__APPLE__) // The Mac GCC is too old to accept this code. 91 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 92 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&entrypoints_); 93 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(entrypoints_)); 94 for (uintptr_t* it = begin; it != end; ++it) { 95 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 96 } 97#endif 98 InitEntryPoints(&entrypoints_); 99} 100 101void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 102 deoptimization_shadow_frame_ = sf; 103} 104 105void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 106 deoptimization_return_value_.SetJ(ret_val.GetJ()); 107} 108 109ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 110 ShadowFrame* sf = deoptimization_shadow_frame_; 111 deoptimization_shadow_frame_ = NULL; 112 ret_val->SetJ(deoptimization_return_value_.GetJ()); 113 return sf; 114} 115 116void Thread::InitTid() { 117 tid_ = ::art::GetTid(); 118} 119 120void Thread::InitAfterFork() { 121 // One thread (us) survived the fork, but we have a new tid so we need to 122 // update the value stashed in this Thread*. 123 InitTid(); 124} 125 126void* Thread::CreateCallback(void* arg) { 127 Thread* self = reinterpret_cast<Thread*>(arg); 128 Runtime* runtime = Runtime::Current(); 129 if (runtime == NULL) { 130 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 131 return NULL; 132 } 133 { 134 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 135 // after self->Init(). 136 MutexLock mu(NULL, *Locks::runtime_shutdown_lock_); 137 // Check that if we got here we cannot be shutting down (as shutdown should never have started 138 // while threads are being born). 139 CHECK(!runtime->IsShuttingDown()); 140 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 141 Runtime::Current()->EndThreadBirth(); 142 } 143 { 144 ScopedObjectAccess soa(self); 145 146 // Copy peer into self, deleting global reference when done. 147 CHECK(self->jpeer_ != NULL); 148 self->opeer_ = soa.Decode<mirror::Object*>(self->jpeer_); 149 self->GetJniEnv()->DeleteGlobalRef(self->jpeer_); 150 self->jpeer_ = NULL; 151 152 { 153 SirtRef<mirror::String> thread_name(self, self->GetThreadName(soa)); 154 self->SetThreadName(thread_name->ToModifiedUtf8().c_str()); 155 } 156 Dbg::PostThreadStart(self); 157 158 // Invoke the 'run' method of our java.lang.Thread. 159 mirror::Object* receiver = self->opeer_; 160 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 161 mirror::AbstractMethod* m = 162 receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(soa.DecodeMethod(mid)); 163 JValue result; 164 ArgArray arg_array(NULL, 0); 165 arg_array.Append(reinterpret_cast<uint32_t>(receiver)); 166 m->Invoke(self, arg_array.GetArray(), arg_array.GetNumBytes(), &result, 'V'); 167 } 168 // Detach and delete self. 169 Runtime::Current()->GetThreadList()->Unregister(self); 170 171 return NULL; 172} 173 174Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, 175 mirror::Object* thread_peer) { 176 mirror::Field* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 177 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetInt(thread_peer))); 178 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 179 // to stop it from going away. 180 if (kIsDebugBuild) { 181 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 182 if (result != NULL && !result->IsSuspended()) { 183 Locks::thread_list_lock_->AssertHeld(soa.Self()); 184 } 185 } 186 return result; 187} 188 189Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, jobject java_thread) { 190 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 191} 192 193static size_t FixStackSize(size_t stack_size) { 194 // A stack size of zero means "use the default". 195 if (stack_size == 0) { 196 stack_size = Runtime::Current()->GetDefaultStackSize(); 197 } 198 199 // Dalvik used the bionic pthread default stack size for native threads, 200 // so include that here to support apps that expect large native stacks. 201 stack_size += 1 * MB; 202 203 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 204 if (stack_size < PTHREAD_STACK_MIN) { 205 stack_size = PTHREAD_STACK_MIN; 206 } 207 208 // It's likely that callers are trying to ensure they have at least a certain amount of 209 // stack space, so we should add our reserved space on top of what they requested, rather 210 // than implicitly take it away from them. 211 stack_size += Thread::kStackOverflowReservedBytes; 212 213 // Some systems require the stack size to be a multiple of the system page size, so round up. 214 stack_size = RoundUp(stack_size, kPageSize); 215 216 return stack_size; 217} 218 219static void SigAltStack(stack_t* new_stack, stack_t* old_stack) { 220 if (sigaltstack(new_stack, old_stack) == -1) { 221 PLOG(FATAL) << "sigaltstack failed"; 222 } 223} 224 225static void SetUpAlternateSignalStack() { 226 // Create and set an alternate signal stack. 227 stack_t ss; 228 ss.ss_sp = new uint8_t[SIGSTKSZ]; 229 ss.ss_size = SIGSTKSZ; 230 ss.ss_flags = 0; 231 CHECK(ss.ss_sp != NULL); 232 SigAltStack(&ss, NULL); 233 234 // Double-check that it worked. 235 ss.ss_sp = NULL; 236 SigAltStack(NULL, &ss); 237 VLOG(threads) << "Alternate signal stack is " << PrettySize(ss.ss_size) << " at " << ss.ss_sp; 238} 239 240static void TearDownAlternateSignalStack() { 241 // Get the pointer so we can free the memory. 242 stack_t ss; 243 SigAltStack(NULL, &ss); 244 uint8_t* allocated_signal_stack = reinterpret_cast<uint8_t*>(ss.ss_sp); 245 246 // Tell the kernel to stop using it. 247 ss.ss_sp = NULL; 248 ss.ss_flags = SS_DISABLE; 249 ss.ss_size = SIGSTKSZ; // Avoid ENOMEM failure with Mac OS' buggy libc. 250 SigAltStack(&ss, NULL); 251 252 // Free it. 253 delete[] allocated_signal_stack; 254} 255 256void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 257 CHECK(java_peer != NULL); 258 Thread* self = static_cast<JNIEnvExt*>(env)->self; 259 Runtime* runtime = Runtime::Current(); 260 261 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 262 bool thread_start_during_shutdown = false; 263 { 264 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 265 if (runtime->IsShuttingDown()) { 266 thread_start_during_shutdown = true; 267 } else { 268 runtime->StartThreadBirth(); 269 } 270 } 271 if (thread_start_during_shutdown) { 272 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 273 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 274 return; 275 } 276 277 Thread* child_thread = new Thread(is_daemon); 278 // Use global JNI ref to hold peer live while child thread starts. 279 child_thread->jpeer_ = env->NewGlobalRef(java_peer); 280 stack_size = FixStackSize(stack_size); 281 282 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 283 // assign it. 284 env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 285 reinterpret_cast<jint>(child_thread)); 286 287 pthread_t new_pthread; 288 pthread_attr_t attr; 289 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 290 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 291 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 292 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 293 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 294 295 if (pthread_create_result != 0) { 296 // pthread_create(3) failed, so clean up. 297 { 298 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 299 runtime->EndThreadBirth(); 300 } 301 // Manually delete the global reference since Thread::Init will not have been run. 302 env->DeleteGlobalRef(child_thread->jpeer_); 303 child_thread->jpeer_ = NULL; 304 delete child_thread; 305 child_thread = NULL; 306 // TODO: remove from thread group? 307 env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 308 { 309 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 310 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 311 ScopedObjectAccess soa(env); 312 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 313 } 314 } 315} 316 317void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 318 // This function does all the initialization that must be run by the native thread it applies to. 319 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 320 // we can handshake with the corresponding native thread when it's ready.) Check this native 321 // thread hasn't been through here already... 322 CHECK(Thread::Current() == NULL); 323 SetUpAlternateSignalStack(); 324 InitCpu(); 325 InitFunctionPointers(); 326 InitCardTable(); 327 InitTid(); 328 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 329 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 330 pthread_self_ = pthread_self(); 331 CHECK(is_started_); 332 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 333 DCHECK_EQ(Thread::Current(), this); 334 335 thin_lock_id_ = thread_list->AllocThreadId(this); 336 InitStackHwm(); 337 338 jni_env_ = new JNIEnvExt(this, java_vm); 339 thread_list->Register(this); 340} 341 342Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 343 bool create_peer) { 344 Thread* self; 345 Runtime* runtime = Runtime::Current(); 346 if (runtime == NULL) { 347 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 348 return NULL; 349 } 350 { 351 MutexLock mu(NULL, *Locks::runtime_shutdown_lock_); 352 if (runtime->IsShuttingDown()) { 353 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 354 return NULL; 355 } else { 356 Runtime::Current()->StartThreadBirth(); 357 self = new Thread(as_daemon); 358 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 359 Runtime::Current()->EndThreadBirth(); 360 } 361 } 362 363 CHECK_NE(self->GetState(), kRunnable); 364 self->SetState(kNative); 365 366 // If we're the main thread, ClassLinker won't be created until after we're attached, 367 // so that thread needs a two-stage attach. Regular threads don't need this hack. 368 // In the compiler, all threads need this hack, because no-one's going to be getting 369 // a native peer! 370 if (create_peer) { 371 self->CreatePeer(thread_name, as_daemon, thread_group); 372 } else { 373 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 374 if (thread_name != NULL) { 375 self->name_->assign(thread_name); 376 ::art::SetThreadName(thread_name); 377 } 378 } 379 380 return self; 381} 382 383void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 384 Runtime* runtime = Runtime::Current(); 385 CHECK(runtime->IsStarted()); 386 JNIEnv* env = jni_env_; 387 388 if (thread_group == NULL) { 389 thread_group = runtime->GetMainThreadGroup(); 390 } 391 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 392 jint thread_priority = GetNativePriority(); 393 jboolean thread_is_daemon = as_daemon; 394 395 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 396 if (peer.get() == NULL) { 397 CHECK(IsExceptionPending()); 398 return; 399 } 400 { 401 ScopedObjectAccess soa(this); 402 opeer_ = soa.Decode<mirror::Object*>(peer.get()); 403 } 404 env->CallNonvirtualVoidMethod(peer.get(), 405 WellKnownClasses::java_lang_Thread, 406 WellKnownClasses::java_lang_Thread_init, 407 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 408 AssertNoPendingException(); 409 410 Thread* self = this; 411 DCHECK_EQ(self, Thread::Current()); 412 jni_env_->SetIntField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 413 reinterpret_cast<jint>(self)); 414 415 ScopedObjectAccess soa(self); 416 SirtRef<mirror::String> peer_thread_name(soa.Self(), GetThreadName(soa)); 417 if (peer_thread_name.get() == NULL) { 418 // The Thread constructor should have set the Thread.name to a 419 // non-null value. However, because we can run without code 420 // available (in the compiler, in tests), we manually assign the 421 // fields the constructor should have set. 422 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 423 SetBoolean(opeer_, thread_is_daemon); 424 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 425 SetObject(opeer_, soa.Decode<mirror::Object*>(thread_group)); 426 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 427 SetObject(opeer_, soa.Decode<mirror::Object*>(thread_name.get())); 428 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 429 SetInt(opeer_, thread_priority); 430 peer_thread_name.reset(GetThreadName(soa)); 431 } 432 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 433 if (peer_thread_name.get() != NULL) { 434 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 435 } 436} 437 438void Thread::SetThreadName(const char* name) { 439 name_->assign(name); 440 ::art::SetThreadName(name); 441 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 442} 443 444void Thread::InitStackHwm() { 445 void* stack_base; 446 size_t stack_size; 447 GetThreadStack(pthread_self_, stack_base, stack_size); 448 449 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 450 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", stack_base, PrettySize(stack_size).c_str()); 451 452 stack_begin_ = reinterpret_cast<byte*>(stack_base); 453 stack_size_ = stack_size; 454 455 if (stack_size_ <= kStackOverflowReservedBytes) { 456 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << stack_size_ << " bytes)"; 457 } 458 459 // TODO: move this into the Linux GetThreadStack implementation. 460#if !defined(__APPLE__) 461 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 462 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 463 // will be broken because we'll die long before we get close to 2GB. 464 bool is_main_thread = (::art::GetTid() == getpid()); 465 if (is_main_thread) { 466 rlimit stack_limit; 467 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 468 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 469 } 470 if (stack_limit.rlim_cur == RLIM_INFINITY) { 471 // Find the default stack size for new threads... 472 pthread_attr_t default_attributes; 473 size_t default_stack_size; 474 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 475 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 476 "default stack size query"); 477 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 478 479 // ...and use that as our limit. 480 size_t old_stack_size = stack_size_; 481 stack_size_ = default_stack_size; 482 stack_begin_ += (old_stack_size - stack_size_); 483 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 484 << " to " << PrettySize(stack_size_) 485 << " with base " << reinterpret_cast<void*>(stack_begin_); 486 } 487 } 488#endif 489 490 // Set stack_end_ to the bottom of the stack saving space of stack overflows 491 ResetDefaultStackEnd(); 492 493 // Sanity check. 494 int stack_variable; 495 CHECK_GT(&stack_variable, reinterpret_cast<void*>(stack_end_)); 496} 497 498void Thread::ShortDump(std::ostream& os) const { 499 os << "Thread["; 500 if (GetThinLockId() != 0) { 501 // If we're in kStarting, we won't have a thin lock id or tid yet. 502 os << GetThinLockId() 503 << ",tid=" << GetTid() << ','; 504 } 505 os << GetState() 506 << ",Thread*=" << this 507 << ",peer=" << opeer_ 508 << ",\"" << *name_ << "\"" 509 << "]"; 510} 511 512void Thread::Dump(std::ostream& os) const { 513 DumpState(os); 514 DumpStack(os); 515} 516 517mirror::String* Thread::GetThreadName(const ScopedObjectAccessUnchecked& soa) const { 518 mirror::Field* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 519 return (opeer_ != NULL) ? reinterpret_cast<mirror::String*>(f->GetObject(opeer_)) : NULL; 520} 521 522void Thread::GetThreadName(std::string& name) const { 523 name.assign(*name_); 524} 525 526void Thread::AtomicSetFlag(ThreadFlag flag) { 527 android_atomic_or(flag, &state_and_flags_.as_int); 528} 529 530void Thread::AtomicClearFlag(ThreadFlag flag) { 531 android_atomic_and(-1 ^ flag, &state_and_flags_.as_int); 532} 533 534// Attempt to rectify locks so that we dump thread list with required locks before exiting. 535static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 536 LOG(ERROR) << *thread << " suspend count already zero."; 537 Locks::thread_suspend_count_lock_->Unlock(self); 538 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 539 Locks::mutator_lock_->SharedTryLock(self); 540 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 541 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 542 } 543 } 544 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 545 Locks::thread_list_lock_->TryLock(self); 546 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 547 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 548 } 549 } 550 std::ostringstream ss; 551 Runtime::Current()->GetThreadList()->DumpLocked(ss); 552 LOG(FATAL) << ss.str(); 553} 554 555void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 556 DCHECK(delta == -1 || delta == +1 || delta == -debug_suspend_count_) 557 << delta << " " << debug_suspend_count_ << " " << this; 558 DCHECK_GE(suspend_count_, debug_suspend_count_) << this; 559 Locks::thread_suspend_count_lock_->AssertHeld(self); 560 if (this != self && !IsSuspended()) { 561 Locks::thread_list_lock_->AssertHeld(self); 562 } 563 if (UNLIKELY(delta < 0 && suspend_count_ <= 0)) { 564 UnsafeLogFatalForSuspendCount(self, this); 565 return; 566 } 567 568 suspend_count_ += delta; 569 if (for_debugger) { 570 debug_suspend_count_ += delta; 571 } 572 573 if (suspend_count_ == 0) { 574 AtomicClearFlag(kSuspendRequest); 575 } else { 576 AtomicSetFlag(kSuspendRequest); 577 } 578} 579 580void Thread::RunCheckpointFunction() { 581 CHECK(checkpoint_function_ != NULL); 582 ATRACE_BEGIN("Checkpoint function"); 583 checkpoint_function_->Run(this); 584 ATRACE_END(); 585} 586 587bool Thread::RequestCheckpoint(Closure* function) { 588 CHECK(!ReadFlag(kCheckpointRequest)) << "Already have a pending checkpoint request"; 589 checkpoint_function_ = function; 590 union StateAndFlags old_state_and_flags = state_and_flags_; 591 // We must be runnable to request a checkpoint. 592 old_state_and_flags.as_struct.state = kRunnable; 593 union StateAndFlags new_state_and_flags = old_state_and_flags; 594 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 595 int succeeded = android_atomic_cmpxchg(old_state_and_flags.as_int, new_state_and_flags.as_int, 596 &state_and_flags_.as_int); 597 return succeeded == 0; 598} 599 600void Thread::FullSuspendCheck() { 601 VLOG(threads) << this << " self-suspending"; 602 ATRACE_BEGIN("Full suspend check"); 603 // Make thread appear suspended to other threads, release mutator_lock_. 604 TransitionFromRunnableToSuspended(kSuspended); 605 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 606 TransitionFromSuspendedToRunnable(); 607 ATRACE_END(); 608 VLOG(threads) << this << " self-reviving"; 609} 610 611Thread* Thread::SuspendForDebugger(jobject peer, bool request_suspension, bool* timed_out) { 612 static const useconds_t kTimeoutUs = 30 * 1000000; // 30s. 613 useconds_t total_delay_us = 0; 614 useconds_t delay_us = 0; 615 bool did_suspend_request = false; 616 *timed_out = false; 617 while (true) { 618 Thread* thread; 619 { 620 ScopedObjectAccess soa(Thread::Current()); 621 Thread* self = soa.Self(); 622 MutexLock mu(self, *Locks::thread_list_lock_); 623 thread = Thread::FromManagedThread(soa, peer); 624 if (thread == NULL) { 625 JNIEnv* env = self->GetJniEnv(); 626 ScopedLocalRef<jstring> scoped_name_string(env, 627 (jstring)env->GetObjectField(peer, 628 WellKnownClasses::java_lang_Thread_name)); 629 ScopedUtfChars scoped_name_chars(env, scoped_name_string.get()); 630 if (scoped_name_chars.c_str() == NULL) { 631 LOG(WARNING) << "No such thread for suspend: " << peer; 632 env->ExceptionClear(); 633 } else { 634 LOG(WARNING) << "No such thread for suspend: " << peer << ":" << scoped_name_chars.c_str(); 635 } 636 637 return NULL; 638 } 639 { 640 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 641 if (request_suspension) { 642 thread->ModifySuspendCount(soa.Self(), +1, true /* for_debugger */); 643 request_suspension = false; 644 did_suspend_request = true; 645 } 646 // IsSuspended on the current thread will fail as the current thread is changed into 647 // Runnable above. As the suspend count is now raised if this is the current thread 648 // it will self suspend on transition to Runnable, making it hard to work with. It's simpler 649 // to just explicitly handle the current thread in the callers to this code. 650 CHECK_NE(thread, soa.Self()) << "Attempt to suspend the current thread for the debugger"; 651 // If thread is suspended (perhaps it was already not Runnable but didn't have a suspend 652 // count, or else we've waited and it has self suspended) or is the current thread, we're 653 // done. 654 if (thread->IsSuspended()) { 655 return thread; 656 } 657 if (total_delay_us >= kTimeoutUs) { 658 LOG(ERROR) << "Thread suspension timed out: " << peer; 659 if (did_suspend_request) { 660 thread->ModifySuspendCount(soa.Self(), -1, true /* for_debugger */); 661 } 662 *timed_out = true; 663 return NULL; 664 } 665 } 666 // Release locks and come out of runnable state. 667 } 668 for (int i = kLockLevelCount - 1; i >= 0; --i) { 669 BaseMutex* held_mutex = Thread::Current()->GetHeldMutex(static_cast<LockLevel>(i)); 670 if (held_mutex != NULL) { 671 LOG(FATAL) << "Holding " << held_mutex->GetName() 672 << " while sleeping for thread suspension"; 673 } 674 } 675 { 676 useconds_t new_delay_us = delay_us * 2; 677 CHECK_GE(new_delay_us, delay_us); 678 if (new_delay_us < 500000) { // Don't allow sleeping to be more than 0.5s. 679 delay_us = new_delay_us; 680 } 681 } 682 if (delay_us == 0) { 683 sched_yield(); 684 // Default to 1 milliseconds (note that this gets multiplied by 2 before the first sleep). 685 delay_us = 500; 686 } else { 687 usleep(delay_us); 688 total_delay_us += delay_us; 689 } 690 } 691} 692 693void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 694 std::string group_name; 695 int priority; 696 bool is_daemon = false; 697 Thread* self = Thread::Current(); 698 699 if (self != NULL && thread != NULL && thread->opeer_ != NULL) { 700 ScopedObjectAccessUnchecked soa(self); 701 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)->GetInt(thread->opeer_); 702 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)->GetBoolean(thread->opeer_); 703 704 mirror::Object* thread_group = 705 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->opeer_); 706 707 if (thread_group != NULL) { 708 mirror::Field* group_name_field = 709 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 710 mirror::String* group_name_string = 711 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 712 group_name = (group_name_string != NULL) ? group_name_string->ToModifiedUtf8() : "<null>"; 713 } 714 } else { 715 priority = GetNativePriority(); 716 } 717 718 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 719 if (scheduler_group_name.empty()) { 720 scheduler_group_name = "default"; 721 } 722 723 if (thread != NULL) { 724 os << '"' << *thread->name_ << '"'; 725 if (is_daemon) { 726 os << " daemon"; 727 } 728 os << " prio=" << priority 729 << " tid=" << thread->GetThinLockId() 730 << " " << thread->GetState(); 731 if (thread->IsStillStarting()) { 732 os << " (still starting up)"; 733 } 734 os << "\n"; 735 } else { 736 os << '"' << ::art::GetThreadName(tid) << '"' 737 << " prio=" << priority 738 << " (not attached)\n"; 739 } 740 741 if (thread != NULL) { 742 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 743 os << " | group=\"" << group_name << "\"" 744 << " sCount=" << thread->suspend_count_ 745 << " dsCount=" << thread->debug_suspend_count_ 746 << " obj=" << reinterpret_cast<void*>(thread->opeer_) 747 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 748 } 749 750 os << " | sysTid=" << tid 751 << " nice=" << getpriority(PRIO_PROCESS, tid) 752 << " cgrp=" << scheduler_group_name; 753 if (thread != NULL) { 754 int policy; 755 sched_param sp; 756 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->pthread_self_, &policy, &sp), __FUNCTION__); 757 os << " sched=" << policy << "/" << sp.sched_priority 758 << " handle=" << reinterpret_cast<void*>(thread->pthread_self_); 759 } 760 os << "\n"; 761 762 // Grab the scheduler stats for this thread. 763 std::string scheduler_stats; 764 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 765 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 766 } else { 767 scheduler_stats = "0 0 0"; 768 } 769 770 char native_thread_state = '?'; 771 int utime = 0; 772 int stime = 0; 773 int task_cpu = 0; 774 GetTaskStats(tid, native_thread_state, utime, stime, task_cpu); 775 776 os << " | state=" << native_thread_state 777 << " schedstat=( " << scheduler_stats << " )" 778 << " utm=" << utime 779 << " stm=" << stime 780 << " core=" << task_cpu 781 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 782 if (thread != NULL) { 783 os << " | stack=" << reinterpret_cast<void*>(thread->stack_begin_) << "-" << reinterpret_cast<void*>(thread->stack_end_) 784 << " stackSize=" << PrettySize(thread->stack_size_) << "\n"; 785 } 786} 787 788void Thread::DumpState(std::ostream& os) const { 789 Thread::DumpState(os, this, GetTid()); 790} 791 792struct StackDumpVisitor : public StackVisitor { 793 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 794 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 795 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 796 last_method(NULL), last_line_number(0), repetition_count(0), frame_count(0) { 797 } 798 799 virtual ~StackDumpVisitor() { 800 if (frame_count == 0) { 801 os << " (no managed stack frames)\n"; 802 } 803 } 804 805 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 806 mirror::AbstractMethod* m = GetMethod(); 807 if (m->IsRuntimeMethod()) { 808 return true; 809 } 810 const int kMaxRepetition = 3; 811 mirror::Class* c = m->GetDeclaringClass(); 812 const mirror::DexCache* dex_cache = c->GetDexCache(); 813 int line_number = -1; 814 if (dex_cache != NULL) { // be tolerant of bad input 815 const DexFile& dex_file = *dex_cache->GetDexFile(); 816 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 817 } 818 if (line_number == last_line_number && last_method == m) { 819 repetition_count++; 820 } else { 821 if (repetition_count >= kMaxRepetition) { 822 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 823 } 824 repetition_count = 0; 825 last_line_number = line_number; 826 last_method = m; 827 } 828 if (repetition_count < kMaxRepetition) { 829 os << " at " << PrettyMethod(m, false); 830 if (m->IsNative()) { 831 os << "(Native method)"; 832 } else { 833 mh.ChangeMethod(m); 834 const char* source_file(mh.GetDeclaringClassSourceFile()); 835 os << "(" << (source_file != NULL ? source_file : "unavailable") 836 << ":" << line_number << ")"; 837 } 838 os << "\n"; 839 if (frame_count == 0) { 840 Monitor::DescribeWait(os, thread); 841 } 842 if (can_allocate) { 843 Monitor::VisitLocks(this, DumpLockedObject, &os); 844 } 845 } 846 847 ++frame_count; 848 return true; 849 } 850 851 static void DumpLockedObject(mirror::Object* o, void* context) 852 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 853 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 854 os << " - locked <" << o << "> (a " << PrettyTypeOf(o) << ")\n"; 855 } 856 857 std::ostream& os; 858 const Thread* thread; 859 const bool can_allocate; 860 MethodHelper mh; 861 mirror::AbstractMethod* last_method; 862 int last_line_number; 863 int repetition_count; 864 int frame_count; 865}; 866 867static bool ShouldShowNativeStack(const Thread* thread) 868 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 869 ThreadState state = thread->GetState(); 870 871 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 872 if (state > kWaiting && state < kStarting) { 873 return true; 874 } 875 876 // In an Object.wait variant or Thread.sleep? That's not interesting. 877 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 878 return false; 879 } 880 881 // In some other native method? That's interesting. 882 // We don't just check kNative because native methods will be in state kSuspended if they're 883 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 884 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 885 mirror::AbstractMethod* current_method = thread->GetCurrentMethod(NULL); 886 return current_method != NULL && current_method->IsNative(); 887} 888 889void Thread::DumpStack(std::ostream& os) const { 890 // TODO: we call this code when dying but may not have suspended the thread ourself. The 891 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 892 // the race with the thread_suspend_count_lock_). 893 bool dump_for_abort = (gAborting > 0); 894 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 895 // If we're currently in native code, dump that stack before dumping the managed stack. 896 if (dump_for_abort || ShouldShowNativeStack(this)) { 897 DumpKernelStack(os, GetTid(), " kernel: ", false); 898 DumpNativeStack(os, GetTid(), " native: ", false); 899 } 900 UniquePtr<Context> context(Context::Create()); 901 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), !throwing_OutOfMemoryError_); 902 dumper.WalkStack(); 903 } else { 904 os << "Not able to dump stack of thread that isn't suspended"; 905 } 906} 907 908void Thread::ThreadExitCallback(void* arg) { 909 Thread* self = reinterpret_cast<Thread*>(arg); 910 if (self->thread_exit_check_count_ == 0) { 911 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's going to use a pthread_key_create destructor?): " << *self; 912 CHECK(is_started_); 913 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 914 self->thread_exit_check_count_ = 1; 915 } else { 916 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 917 } 918} 919 920void Thread::Startup() { 921 CHECK(!is_started_); 922 is_started_ = true; 923 { 924 // MutexLock to keep annotalysis happy. 925 // 926 // Note we use NULL for the thread because Thread::Current can 927 // return garbage since (is_started_ == true) and 928 // Thread::pthread_key_self_ is not yet initialized. 929 // This was seen on glibc. 930 MutexLock mu(NULL, *Locks::thread_suspend_count_lock_); 931 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 932 *Locks::thread_suspend_count_lock_); 933 } 934 935 // Allocate a TLS slot. 936 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 937 938 // Double-check the TLS slot allocation. 939 if (pthread_getspecific(pthread_key_self_) != NULL) { 940 LOG(FATAL) << "Newly-created pthread TLS slot is not NULL"; 941 } 942} 943 944void Thread::FinishStartup() { 945 Runtime* runtime = Runtime::Current(); 946 CHECK(runtime->IsStarted()); 947 948 // Finish attaching the main thread. 949 ScopedObjectAccess soa(Thread::Current()); 950 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 951 952 Runtime::Current()->GetClassLinker()->RunRootClinits(); 953} 954 955void Thread::Shutdown() { 956 CHECK(is_started_); 957 is_started_ = false; 958 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 959 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 960 if (resume_cond_ != NULL) { 961 delete resume_cond_; 962 resume_cond_ = NULL; 963 } 964} 965 966Thread::Thread(bool daemon) 967 : suspend_count_(0), 968 card_table_(NULL), 969 exception_(NULL), 970 stack_end_(NULL), 971 managed_stack_(), 972 jni_env_(NULL), 973 self_(NULL), 974 opeer_(NULL), 975 jpeer_(NULL), 976 stack_begin_(NULL), 977 stack_size_(0), 978 thin_lock_id_(0), 979 tid_(0), 980 wait_mutex_(new Mutex("a thread wait mutex")), 981 wait_cond_(new ConditionVariable("a thread wait condition variable", *wait_mutex_)), 982 wait_monitor_(NULL), 983 interrupted_(false), 984 wait_next_(NULL), 985 monitor_enter_object_(NULL), 986 top_sirt_(NULL), 987 runtime_(NULL), 988 class_loader_override_(NULL), 989 long_jump_context_(NULL), 990 throwing_OutOfMemoryError_(false), 991 debug_suspend_count_(0), 992 debug_invoke_req_(new DebugInvokeReq), 993 deoptimization_shadow_frame_(NULL), 994 instrumentation_stack_(new std::deque<instrumentation::InstrumentationStackFrame>), 995 name_(new std::string(kThreadNameDuringStartup)), 996 daemon_(daemon), 997 pthread_self_(0), 998 no_thread_suspension_(0), 999 last_no_thread_suspension_cause_(NULL), 1000 checkpoint_function_(0), 1001 thread_exit_check_count_(0) { 1002 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1003 state_and_flags_.as_struct.flags = 0; 1004 state_and_flags_.as_struct.state = kNative; 1005 memset(&held_mutexes_[0], 0, sizeof(held_mutexes_)); 1006} 1007 1008bool Thread::IsStillStarting() const { 1009 // You might think you can check whether the state is kStarting, but for much of thread startup, 1010 // the thread is in kNative; it might also be in kVmWait. 1011 // You might think you can check whether the peer is NULL, but the peer is actually created and 1012 // assigned fairly early on, and needs to be. 1013 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1014 // this thread _ever_ entered kRunnable". 1015 return (jpeer_ == NULL && opeer_ == NULL) || (*name_ == kThreadNameDuringStartup); 1016} 1017 1018void Thread::AssertNoPendingException() const { 1019 if (UNLIKELY(IsExceptionPending())) { 1020 ScopedObjectAccess soa(Thread::Current()); 1021 mirror::Throwable* exception = GetException(NULL); 1022 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1023 } 1024} 1025 1026static void MonitorExitVisitor(const mirror::Object* object, void* arg) NO_THREAD_SAFETY_ANALYSIS { 1027 Thread* self = reinterpret_cast<Thread*>(arg); 1028 mirror::Object* entered_monitor = const_cast<mirror::Object*>(object); 1029 if (self->HoldsLock(entered_monitor)) { 1030 LOG(WARNING) << "Calling MonitorExit on object " 1031 << object << " (" << PrettyTypeOf(object) << ")" 1032 << " left locked by native thread " 1033 << *Thread::Current() << " which is detaching"; 1034 entered_monitor->MonitorExit(self); 1035 } 1036} 1037 1038void Thread::Destroy() { 1039 Thread* self = this; 1040 DCHECK_EQ(self, Thread::Current()); 1041 1042 if (opeer_ != NULL) { 1043 ScopedObjectAccess soa(self); 1044 // We may need to call user-supplied managed code, do this before final clean-up. 1045 HandleUncaughtExceptions(soa); 1046 RemoveFromThreadGroup(soa); 1047 1048 // this.nativePeer = 0; 1049 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetInt(opeer_, 0); 1050 Dbg::PostThreadDeath(self); 1051 1052 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1053 // who is waiting. 1054 mirror::Object* lock = 1055 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 1056 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1057 if (lock != NULL) { 1058 ObjectLock locker(self, lock); 1059 locker.Notify(); 1060 } 1061 } 1062 1063 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1064 if (jni_env_ != NULL) { 1065 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self); 1066 } 1067} 1068 1069Thread::~Thread() { 1070 if (jni_env_ != NULL && jpeer_ != NULL) { 1071 // If pthread_create fails we don't have a jni env here. 1072 jni_env_->DeleteGlobalRef(jpeer_); 1073 jpeer_ = NULL; 1074 } 1075 opeer_ = NULL; 1076 1077 delete jni_env_; 1078 jni_env_ = NULL; 1079 1080 CHECK_NE(GetState(), kRunnable); 1081 // We may be deleting a still born thread. 1082 SetStateUnsafe(kTerminated); 1083 1084 delete wait_cond_; 1085 delete wait_mutex_; 1086 1087 if (long_jump_context_ != NULL) { 1088 delete long_jump_context_; 1089 } 1090 1091 delete debug_invoke_req_; 1092 delete instrumentation_stack_; 1093 delete name_; 1094 1095 TearDownAlternateSignalStack(); 1096} 1097 1098void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1099 if (!IsExceptionPending()) { 1100 return; 1101 } 1102 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1103 ScopedThreadStateChange tsc(this, kNative); 1104 1105 // Get and clear the exception. 1106 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1107 jni_env_->ExceptionClear(); 1108 1109 // If the thread has its own handler, use that. 1110 ScopedLocalRef<jobject> handler(jni_env_, 1111 jni_env_->GetObjectField(peer.get(), 1112 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1113 if (handler.get() == NULL) { 1114 // Otherwise use the thread group's default handler. 1115 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1116 } 1117 1118 // Call the handler. 1119 jni_env_->CallVoidMethod(handler.get(), 1120 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1121 peer.get(), exception.get()); 1122 1123 // If the handler threw, clear that exception too. 1124 jni_env_->ExceptionClear(); 1125} 1126 1127void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1128 // this.group.removeThread(this); 1129 // group can be null if we're in the compiler or a test. 1130 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1131 if (ogroup != NULL) { 1132 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1133 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1134 ScopedThreadStateChange tsc(soa.Self(), kNative); 1135 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1136 peer.get()); 1137 } 1138} 1139 1140size_t Thread::NumSirtReferences() { 1141 size_t count = 0; 1142 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1143 count += cur->NumberOfReferences(); 1144 } 1145 return count; 1146} 1147 1148bool Thread::SirtContains(jobject obj) const { 1149 mirror::Object** sirt_entry = reinterpret_cast<mirror::Object**>(obj); 1150 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1151 if (cur->Contains(sirt_entry)) { 1152 return true; 1153 } 1154 } 1155 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1156 return managed_stack_.ShadowFramesContain(sirt_entry); 1157} 1158 1159void Thread::SirtVisitRoots(RootVisitor* visitor, void* arg) { 1160 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1161 size_t num_refs = cur->NumberOfReferences(); 1162 for (size_t j = 0; j < num_refs; j++) { 1163 mirror::Object* object = cur->GetReference(j); 1164 if (object != NULL) { 1165 visitor(object, arg); 1166 } 1167 } 1168 } 1169} 1170 1171mirror::Object* Thread::DecodeJObject(jobject obj) const { 1172 Locks::mutator_lock_->AssertSharedHeld(this); 1173 if (obj == NULL) { 1174 return NULL; 1175 } 1176 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1177 IndirectRefKind kind = GetIndirectRefKind(ref); 1178 mirror::Object* result; 1179 // The "kinds" below are sorted by the frequency we expect to encounter them. 1180 if (kind == kLocal) { 1181 IndirectReferenceTable& locals = jni_env_->locals; 1182 result = const_cast<mirror::Object*>(locals.Get(ref)); 1183 } else if (kind == kSirtOrInvalid) { 1184 // TODO: make stack indirect reference table lookup more efficient 1185 // Check if this is a local reference in the SIRT 1186 if (LIKELY(SirtContains(obj))) { 1187 result = *reinterpret_cast<mirror::Object**>(obj); // Read from SIRT 1188 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1189 // Assume an invalid local reference is actually a direct pointer. 1190 result = reinterpret_cast<mirror::Object*>(obj); 1191 } else { 1192 result = kInvalidIndirectRefObject; 1193 } 1194 } else if (kind == kGlobal) { 1195 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1196 IndirectReferenceTable& globals = vm->globals; 1197 MutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1198 result = const_cast<mirror::Object*>(globals.Get(ref)); 1199 } else { 1200 DCHECK_EQ(kind, kWeakGlobal); 1201 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1202 IndirectReferenceTable& weak_globals = vm->weak_globals; 1203 MutexLock mu(const_cast<Thread*>(this), vm->weak_globals_lock); 1204 result = const_cast<mirror::Object*>(weak_globals.Get(ref)); 1205 if (result == kClearedJniWeakGlobal) { 1206 // This is a special case where it's okay to return NULL. 1207 return NULL; 1208 } 1209 } 1210 1211 if (UNLIKELY(result == NULL)) { 1212 JniAbortF(NULL, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1213 } else { 1214 if (kIsDebugBuild && (result != kInvalidIndirectRefObject)) { 1215 Runtime::Current()->GetHeap()->VerifyObject(result); 1216 } 1217 } 1218 return result; 1219} 1220 1221// Implements java.lang.Thread.interrupted. 1222bool Thread::Interrupted() { 1223 MutexLock mu(Thread::Current(), *wait_mutex_); 1224 bool interrupted = interrupted_; 1225 interrupted_ = false; 1226 return interrupted; 1227} 1228 1229// Implements java.lang.Thread.isInterrupted. 1230bool Thread::IsInterrupted() { 1231 MutexLock mu(Thread::Current(), *wait_mutex_); 1232 return interrupted_; 1233} 1234 1235void Thread::Interrupt() { 1236 Thread* self = Thread::Current(); 1237 MutexLock mu(self, *wait_mutex_); 1238 if (interrupted_) { 1239 return; 1240 } 1241 interrupted_ = true; 1242 NotifyLocked(self); 1243} 1244 1245void Thread::Notify() { 1246 Thread* self = Thread::Current(); 1247 MutexLock mu(self, *wait_mutex_); 1248 NotifyLocked(self); 1249} 1250 1251void Thread::NotifyLocked(Thread* self) { 1252 if (wait_monitor_ != NULL) { 1253 wait_cond_->Signal(self); 1254 } 1255} 1256 1257class CountStackDepthVisitor : public StackVisitor { 1258 public: 1259 explicit CountStackDepthVisitor(Thread* thread) 1260 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1261 : StackVisitor(thread, NULL), 1262 depth_(0), skip_depth_(0), skipping_(true) {} 1263 1264 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1265 // We want to skip frames up to and including the exception's constructor. 1266 // Note we also skip the frame if it doesn't have a method (namely the callee 1267 // save frame) 1268 mirror::AbstractMethod* m = GetMethod(); 1269 if (skipping_ && !m->IsRuntimeMethod() && 1270 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1271 skipping_ = false; 1272 } 1273 if (!skipping_) { 1274 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1275 ++depth_; 1276 } 1277 } else { 1278 ++skip_depth_; 1279 } 1280 return true; 1281 } 1282 1283 int GetDepth() const { 1284 return depth_; 1285 } 1286 1287 int GetSkipDepth() const { 1288 return skip_depth_; 1289 } 1290 1291 private: 1292 uint32_t depth_; 1293 uint32_t skip_depth_; 1294 bool skipping_; 1295}; 1296 1297class BuildInternalStackTraceVisitor : public StackVisitor { 1298 public: 1299 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1300 : StackVisitor(thread, NULL), self_(self), 1301 skip_depth_(skip_depth), count_(0), dex_pc_trace_(NULL), method_trace_(NULL) {} 1302 1303 bool Init(int depth) 1304 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1305 // Allocate method trace with an extra slot that will hold the PC trace 1306 SirtRef<mirror::ObjectArray<mirror::Object> > 1307 method_trace(self_, 1308 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1309 depth + 1)); 1310 if (method_trace.get() == NULL) { 1311 return false; 1312 } 1313 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1314 if (dex_pc_trace == NULL) { 1315 return false; 1316 } 1317 // Save PC trace in last element of method trace, also places it into the 1318 // object graph. 1319 method_trace->Set(depth, dex_pc_trace); 1320 // Set the Object*s and assert that no thread suspension is now possible. 1321 const char* last_no_suspend_cause = 1322 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1323 CHECK(last_no_suspend_cause == NULL) << last_no_suspend_cause; 1324 method_trace_ = method_trace.get(); 1325 dex_pc_trace_ = dex_pc_trace; 1326 return true; 1327 } 1328 1329 virtual ~BuildInternalStackTraceVisitor() { 1330 if (method_trace_ != NULL) { 1331 self_->EndAssertNoThreadSuspension(NULL); 1332 } 1333 } 1334 1335 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1336 if (method_trace_ == NULL || dex_pc_trace_ == NULL) { 1337 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1338 } 1339 if (skip_depth_ > 0) { 1340 skip_depth_--; 1341 return true; 1342 } 1343 mirror::AbstractMethod* m = GetMethod(); 1344 if (m->IsRuntimeMethod()) { 1345 return true; // Ignore runtime frames (in particular callee save). 1346 } 1347 method_trace_->Set(count_, m); 1348 dex_pc_trace_->Set(count_, GetDexPc()); 1349 ++count_; 1350 return true; 1351 } 1352 1353 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1354 return method_trace_; 1355 } 1356 1357 private: 1358 Thread* const self_; 1359 // How many more frames to skip. 1360 int32_t skip_depth_; 1361 // Current position down stack trace. 1362 uint32_t count_; 1363 // Array of dex PC values. 1364 mirror::IntArray* dex_pc_trace_; 1365 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1366 mirror::ObjectArray<mirror::Object>* method_trace_; 1367}; 1368 1369jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1370 // Compute depth of stack 1371 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1372 count_visitor.WalkStack(); 1373 int32_t depth = count_visitor.GetDepth(); 1374 int32_t skip_depth = count_visitor.GetSkipDepth(); 1375 1376 // Build internal stack trace. 1377 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1378 skip_depth); 1379 if (!build_trace_visitor.Init(depth)) { 1380 return NULL; // Allocation failed. 1381 } 1382 build_trace_visitor.WalkStack(); 1383 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1384 if (kIsDebugBuild) { 1385 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1386 CHECK(trace->Get(i) != NULL); 1387 } 1388 } 1389 return soa.AddLocalReference<jobjectArray>(trace); 1390} 1391 1392jobjectArray Thread::InternalStackTraceToStackTraceElementArray(JNIEnv* env, jobject internal, 1393 jobjectArray output_array, int* stack_depth) { 1394 // Transition into runnable state to work on Object*/Array* 1395 ScopedObjectAccess soa(env); 1396 // Decode the internal stack trace into the depth, method trace and PC trace 1397 mirror::ObjectArray<mirror::Object>* method_trace = 1398 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1399 int32_t depth = method_trace->GetLength() - 1; 1400 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1401 1402 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1403 1404 jobjectArray result; 1405 mirror::ObjectArray<mirror::StackTraceElement>* java_traces; 1406 if (output_array != NULL) { 1407 // Reuse the array we were given. 1408 result = output_array; 1409 java_traces = soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(output_array); 1410 // ...adjusting the number of frames we'll write to not exceed the array length. 1411 depth = std::min(depth, java_traces->GetLength()); 1412 } else { 1413 // Create java_trace array and place in local reference table 1414 java_traces = class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1415 if (java_traces == NULL) { 1416 return NULL; 1417 } 1418 result = soa.AddLocalReference<jobjectArray>(java_traces); 1419 } 1420 1421 if (stack_depth != NULL) { 1422 *stack_depth = depth; 1423 } 1424 1425 MethodHelper mh; 1426 for (int32_t i = 0; i < depth; ++i) { 1427 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1428 mirror::AbstractMethod* method = down_cast<mirror::AbstractMethod*>(method_trace->Get(i)); 1429 mh.ChangeMethod(method); 1430 uint32_t dex_pc = pc_trace->Get(i); 1431 int32_t line_number = mh.GetLineNumFromDexPC(dex_pc); 1432 // Allocate element, potentially triggering GC 1433 // TODO: reuse class_name_object via Class::name_? 1434 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1435 CHECK(descriptor != NULL); 1436 std::string class_name(PrettyDescriptor(descriptor)); 1437 SirtRef<mirror::String> class_name_object(soa.Self(), 1438 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1439 class_name.c_str())); 1440 if (class_name_object.get() == NULL) { 1441 return NULL; 1442 } 1443 const char* method_name = mh.GetName(); 1444 CHECK(method_name != NULL); 1445 SirtRef<mirror::String> method_name_object(soa.Self(), 1446 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1447 method_name)); 1448 if (method_name_object.get() == NULL) { 1449 return NULL; 1450 } 1451 const char* source_file = mh.GetDeclaringClassSourceFile(); 1452 SirtRef<mirror::String> source_name_object(soa.Self(), mirror::String::AllocFromModifiedUtf8(soa.Self(), 1453 source_file)); 1454 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc(soa.Self(), 1455 class_name_object.get(), 1456 method_name_object.get(), 1457 source_name_object.get(), 1458 line_number); 1459 if (obj == NULL) { 1460 return NULL; 1461 } 1462#ifdef MOVING_GARBAGE_COLLECTOR 1463 // Re-read after potential GC 1464 java_traces = Decode<ObjectArray<Object>*>(soa.Env(), result); 1465 method_trace = down_cast<ObjectArray<Object>*>(Decode<Object*>(soa.Env(), internal)); 1466 pc_trace = down_cast<IntArray*>(method_trace->Get(depth)); 1467#endif 1468 java_traces->Set(i, obj); 1469 } 1470 return result; 1471} 1472 1473void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1474 const char* exception_class_descriptor, const char* fmt, ...) { 1475 va_list args; 1476 va_start(args, fmt); 1477 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1478 fmt, args); 1479 va_end(args); 1480} 1481 1482void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1483 const char* exception_class_descriptor, 1484 const char* fmt, va_list ap) { 1485 std::string msg; 1486 StringAppendV(&msg, fmt, ap); 1487 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1488} 1489 1490void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1491 const char* msg) { 1492 AssertNoPendingException(); // Callers should either clear or call ThrowNewWrappedException. 1493 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1494} 1495 1496void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1497 const char* exception_class_descriptor, 1498 const char* msg) { 1499 DCHECK_EQ(this, Thread::Current()); 1500 // Ensure we don't forget arguments over object allocation. 1501 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1502 SirtRef<mirror::AbstractMethod> saved_throw_method(this, throw_location.GetMethod()); 1503 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1504 SirtRef<mirror::Throwable> cause(this, GetException(NULL)); 1505 ClearException(); 1506 Runtime* runtime = Runtime::Current(); 1507 1508 mirror::ClassLoader* cl = NULL; 1509 if (throw_location.GetMethod() != NULL) { 1510 cl = throw_location.GetMethod()->GetDeclaringClass()->GetClassLoader(); 1511 } 1512 SirtRef<mirror::Class> 1513 exception_class(this, runtime->GetClassLinker()->FindClass(exception_class_descriptor, cl)); 1514 if (UNLIKELY(exception_class.get() == NULL)) { 1515 CHECK(IsExceptionPending()); 1516 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1517 return; 1518 } 1519 1520 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class.get(), true, true))) { 1521 DCHECK(IsExceptionPending()); 1522 return; 1523 } 1524 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1525 SirtRef<mirror::Throwable> exception(this, 1526 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1527 1528 // Choose an appropriate constructor and set up the arguments. 1529 const char* signature; 1530 SirtRef<mirror::String> msg_string(this, NULL); 1531 if (msg != NULL) { 1532 // Ensure we remember this and the method over the String allocation. 1533 msg_string.reset(mirror::String::AllocFromModifiedUtf8(this, msg)); 1534 if (UNLIKELY(msg_string.get() == NULL)) { 1535 CHECK(IsExceptionPending()); // OOME. 1536 return; 1537 } 1538 if (cause.get() == NULL) { 1539 signature = "(Ljava/lang/String;)V"; 1540 } else { 1541 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1542 } 1543 } else { 1544 if (cause.get() == NULL) { 1545 signature = "()V"; 1546 } else { 1547 signature = "(Ljava/lang/Throwable;)V"; 1548 } 1549 } 1550 mirror::AbstractMethod* exception_init_method = 1551 exception_class->FindDeclaredDirectMethod("<init>", signature); 1552 1553 CHECK(exception_init_method != NULL) << "No <init>" << signature << " in " 1554 << PrettyDescriptor(exception_class_descriptor); 1555 1556 if (UNLIKELY(!runtime->IsStarted())) { 1557 // Something is trying to throw an exception without a started runtime, which is the common 1558 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1559 // the exception fields directly. 1560 if (msg != NULL) { 1561 exception->SetDetailMessage(msg_string.get()); 1562 } 1563 if (cause.get() != NULL) { 1564 exception->SetCause(cause.get()); 1565 } 1566 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1567 throw_location.GetDexPc()); 1568 SetException(gc_safe_throw_location, exception.get()); 1569 } else { 1570 ArgArray args("VLL", 3); 1571 args.Append(reinterpret_cast<uint32_t>(exception.get())); 1572 if (msg != NULL) { 1573 args.Append(reinterpret_cast<uint32_t>(msg_string.get())); 1574 } 1575 if (cause.get() != NULL) { 1576 args.Append(reinterpret_cast<uint32_t>(cause.get())); 1577 } 1578 JValue result; 1579 exception_init_method->Invoke(this, args.GetArray(), args.GetNumBytes(), &result, 'V'); 1580 if (LIKELY(!IsExceptionPending())) { 1581 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1582 throw_location.GetDexPc()); 1583 SetException(gc_safe_throw_location, exception.get()); 1584 } 1585 } 1586} 1587 1588void Thread::ThrowOutOfMemoryError(const char* msg) { 1589 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1590 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1591 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1592 if (!throwing_OutOfMemoryError_) { 1593 throwing_OutOfMemoryError_ = true; 1594 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1595 throwing_OutOfMemoryError_ = false; 1596 } else { 1597 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1598 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1599 } 1600} 1601 1602Thread* Thread::CurrentFromGdb() { 1603 return Thread::Current(); 1604} 1605 1606void Thread::DumpFromGdb() const { 1607 std::ostringstream ss; 1608 Dump(ss); 1609 std::string str(ss.str()); 1610 // log to stderr for debugging command line processes 1611 std::cerr << str; 1612#ifdef HAVE_ANDROID_OS 1613 // log to logcat for debugging frameworks processes 1614 LOG(INFO) << str; 1615#endif 1616} 1617 1618struct EntryPointInfo { 1619 uint32_t offset; 1620 const char* name; 1621}; 1622#define ENTRY_POINT_INFO(x) { ENTRYPOINT_OFFSET(x), #x } 1623static const EntryPointInfo gThreadEntryPointInfo[] = { 1624 ENTRY_POINT_INFO(pAllocArrayFromCode), 1625 ENTRY_POINT_INFO(pAllocArrayFromCodeWithAccessCheck), 1626 ENTRY_POINT_INFO(pAllocObjectFromCode), 1627 ENTRY_POINT_INFO(pAllocObjectFromCodeWithAccessCheck), 1628 ENTRY_POINT_INFO(pCheckAndAllocArrayFromCode), 1629 ENTRY_POINT_INFO(pCheckAndAllocArrayFromCodeWithAccessCheck), 1630 ENTRY_POINT_INFO(pInstanceofNonTrivialFromCode), 1631 ENTRY_POINT_INFO(pCanPutArrayElementFromCode), 1632 ENTRY_POINT_INFO(pCheckCastFromCode), 1633 ENTRY_POINT_INFO(pInitializeStaticStorage), 1634 ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccessFromCode), 1635 ENTRY_POINT_INFO(pInitializeTypeFromCode), 1636 ENTRY_POINT_INFO(pResolveStringFromCode), 1637 ENTRY_POINT_INFO(pSet32Instance), 1638 ENTRY_POINT_INFO(pSet32Static), 1639 ENTRY_POINT_INFO(pSet64Instance), 1640 ENTRY_POINT_INFO(pSet64Static), 1641 ENTRY_POINT_INFO(pSetObjInstance), 1642 ENTRY_POINT_INFO(pSetObjStatic), 1643 ENTRY_POINT_INFO(pGet32Instance), 1644 ENTRY_POINT_INFO(pGet32Static), 1645 ENTRY_POINT_INFO(pGet64Instance), 1646 ENTRY_POINT_INFO(pGet64Static), 1647 ENTRY_POINT_INFO(pGetObjInstance), 1648 ENTRY_POINT_INFO(pGetObjStatic), 1649 ENTRY_POINT_INFO(pHandleFillArrayDataFromCode), 1650 ENTRY_POINT_INFO(pJniMethodStart), 1651 ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1652 ENTRY_POINT_INFO(pJniMethodEnd), 1653 ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1654 ENTRY_POINT_INFO(pJniMethodEndWithReference), 1655 ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1656 ENTRY_POINT_INFO(pLockObjectFromCode), 1657 ENTRY_POINT_INFO(pUnlockObjectFromCode), 1658 ENTRY_POINT_INFO(pCmpgDouble), 1659 ENTRY_POINT_INFO(pCmpgFloat), 1660 ENTRY_POINT_INFO(pCmplDouble), 1661 ENTRY_POINT_INFO(pCmplFloat), 1662 ENTRY_POINT_INFO(pFmod), 1663 ENTRY_POINT_INFO(pSqrt), 1664 ENTRY_POINT_INFO(pL2d), 1665 ENTRY_POINT_INFO(pFmodf), 1666 ENTRY_POINT_INFO(pL2f), 1667 ENTRY_POINT_INFO(pD2iz), 1668 ENTRY_POINT_INFO(pF2iz), 1669 ENTRY_POINT_INFO(pIdivmod), 1670 ENTRY_POINT_INFO(pD2l), 1671 ENTRY_POINT_INFO(pF2l), 1672 ENTRY_POINT_INFO(pLdiv), 1673 ENTRY_POINT_INFO(pLdivmod), 1674 ENTRY_POINT_INFO(pLmul), 1675 ENTRY_POINT_INFO(pShlLong), 1676 ENTRY_POINT_INFO(pShrLong), 1677 ENTRY_POINT_INFO(pUshrLong), 1678 ENTRY_POINT_INFO(pInterpreterToInterpreterEntry), 1679 ENTRY_POINT_INFO(pInterpreterToQuickEntry), 1680 ENTRY_POINT_INFO(pIndexOf), 1681 ENTRY_POINT_INFO(pMemcmp16), 1682 ENTRY_POINT_INFO(pStringCompareTo), 1683 ENTRY_POINT_INFO(pMemcpy), 1684 ENTRY_POINT_INFO(pPortableResolutionTrampolineFromCode), 1685 ENTRY_POINT_INFO(pQuickResolutionTrampolineFromCode), 1686 ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1687 ENTRY_POINT_INFO(pInvokeInterfaceTrampoline), 1688 ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1689 ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1690 ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1691 ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1692 ENTRY_POINT_INFO(pCheckSuspendFromCode), 1693 ENTRY_POINT_INFO(pTestSuspendFromCode), 1694 ENTRY_POINT_INFO(pDeliverException), 1695 ENTRY_POINT_INFO(pThrowArrayBoundsFromCode), 1696 ENTRY_POINT_INFO(pThrowDivZeroFromCode), 1697 ENTRY_POINT_INFO(pThrowNoSuchMethodFromCode), 1698 ENTRY_POINT_INFO(pThrowNullPointerFromCode), 1699 ENTRY_POINT_INFO(pThrowStackOverflowFromCode), 1700}; 1701#undef ENTRY_POINT_INFO 1702 1703void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1704 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1705 1706#define DO_THREAD_OFFSET(x) if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { os << # x; return; } 1707 DO_THREAD_OFFSET(state_and_flags_); 1708 DO_THREAD_OFFSET(card_table_); 1709 DO_THREAD_OFFSET(exception_); 1710 DO_THREAD_OFFSET(opeer_); 1711 DO_THREAD_OFFSET(jni_env_); 1712 DO_THREAD_OFFSET(self_); 1713 DO_THREAD_OFFSET(stack_end_); 1714 DO_THREAD_OFFSET(suspend_count_); 1715 DO_THREAD_OFFSET(thin_lock_id_); 1716 //DO_THREAD_OFFSET(top_of_managed_stack_); 1717 //DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1718 DO_THREAD_OFFSET(top_sirt_); 1719#undef DO_THREAD_OFFSET 1720 1721 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1722 CHECK_EQ(entry_point_count * size_of_pointers, sizeof(EntryPoints)); 1723 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, entrypoints_); 1724 for (size_t i = 0; i < entry_point_count; ++i) { 1725 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1726 expected_offset += size_of_pointers; 1727 if (gThreadEntryPointInfo[i].offset == offset) { 1728 os << gThreadEntryPointInfo[i].name; 1729 return; 1730 } 1731 } 1732 os << offset; 1733} 1734 1735static const bool kDebugExceptionDelivery = false; 1736class CatchBlockStackVisitor : public StackVisitor { 1737 public: 1738 CatchBlockStackVisitor(Thread* self, const ThrowLocation& throw_location, 1739 mirror::Throwable* exception, bool is_deoptimization) 1740 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1741 : StackVisitor(self, self->GetLongJumpContext()), 1742 self_(self), exception_(exception), is_deoptimization_(is_deoptimization), 1743 to_find_(is_deoptimization ? NULL : exception->GetClass()), throw_location_(throw_location), 1744 handler_quick_frame_(NULL), handler_quick_frame_pc_(0), handler_dex_pc_(0), 1745 native_method_count_(0), 1746 method_tracing_active_(is_deoptimization || 1747 Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()), 1748 instrumentation_frames_to_pop_(0), top_shadow_frame_(NULL), prev_shadow_frame_(NULL) { 1749 // Exception not in root sets, can't allow GC. 1750 last_no_assert_suspension_cause_ = self->StartAssertNoThreadSuspension("Finding catch block"); 1751 } 1752 1753 ~CatchBlockStackVisitor() { 1754 LOG(FATAL) << "UNREACHABLE"; // Expected to take long jump. 1755 } 1756 1757 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1758 mirror::AbstractMethod* method = GetMethod(); 1759 if (method == NULL) { 1760 // This is the upcall, we remember the frame and last pc so that we may long jump to them. 1761 handler_quick_frame_pc_ = GetCurrentQuickFramePc(); 1762 handler_quick_frame_ = GetCurrentQuickFrame(); 1763 return false; // End stack walk. 1764 } else { 1765 if (UNLIKELY(method_tracing_active_ && 1766 GetInstrumentationExitPc() == GetReturnPc())) { 1767 // Keep count of the number of unwinds during instrumentation. 1768 instrumentation_frames_to_pop_++; 1769 } 1770 if (method->IsRuntimeMethod()) { 1771 // Ignore callee save method. 1772 DCHECK(method->IsCalleeSaveMethod()); 1773 return true; 1774 } else if (is_deoptimization_) { 1775 return HandleDeoptimization(method); 1776 } else { 1777 return HandleTryItems(method); 1778 } 1779 } 1780 } 1781 1782 bool HandleTryItems(mirror::AbstractMethod* method) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1783 uint32_t dex_pc = DexFile::kDexNoIndex; 1784 if (method->IsNative()) { 1785 native_method_count_++; 1786 } else { 1787 dex_pc = GetDexPc(); 1788 } 1789 if (dex_pc != DexFile::kDexNoIndex) { 1790 uint32_t found_dex_pc = method->FindCatchBlock(to_find_, dex_pc); 1791 if (found_dex_pc != DexFile::kDexNoIndex) { 1792 handler_dex_pc_ = found_dex_pc; 1793 handler_quick_frame_pc_ = method->ToNativePc(found_dex_pc); 1794 handler_quick_frame_ = GetCurrentQuickFrame(); 1795 return false; // End stack walk. 1796 } 1797 } 1798 return true; // Continue stack walk. 1799 } 1800 1801 bool HandleDeoptimization(mirror::AbstractMethod* m) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1802 MethodHelper mh(m); 1803 const DexFile::CodeItem* code_item = mh.GetCodeItem(); 1804 CHECK(code_item != NULL); 1805 uint16_t num_regs = code_item->registers_size_; 1806 uint32_t dex_pc = GetDexPc(); 1807 const Instruction* inst = Instruction::At(code_item->insns_ + dex_pc); 1808 uint32_t new_dex_pc = dex_pc + inst->SizeInCodeUnits(); 1809 ShadowFrame* new_frame = ShadowFrame::Create(num_regs, NULL, m, new_dex_pc); 1810 verifier::MethodVerifier verifier(&mh.GetDexFile(), mh.GetDexCache(), mh.GetClassLoader(), 1811 mh.GetClassDefIndex(), code_item, 1812 m->GetDexMethodIndex(), m, m->GetAccessFlags(), false, true); 1813 verifier.Verify(); 1814 std::vector<int32_t> kinds = verifier.DescribeVRegs(dex_pc); 1815 for(uint16_t reg = 0; reg < num_regs; reg++) { 1816 VRegKind kind = static_cast<VRegKind>(kinds.at(reg * 2)); 1817 switch (kind) { 1818 case kUndefined: 1819 new_frame->SetVReg(reg, 0xEBADDE09); 1820 break; 1821 case kConstant: 1822 new_frame->SetVReg(reg, kinds.at((reg * 2) + 1)); 1823 break; 1824 case kReferenceVReg: 1825 new_frame->SetVRegReference(reg, 1826 reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kind))); 1827 break; 1828 default: 1829 new_frame->SetVReg(reg, GetVReg(m, reg, kind)); 1830 break; 1831 } 1832 } 1833 if (prev_shadow_frame_ != NULL) { 1834 prev_shadow_frame_->SetLink(new_frame); 1835 } else { 1836 top_shadow_frame_ = new_frame; 1837 } 1838 prev_shadow_frame_ = new_frame; 1839 return true; 1840 } 1841 1842 void DoLongJump() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1843 mirror::AbstractMethod* catch_method = *handler_quick_frame_; 1844 if (catch_method == NULL) { 1845 if (kDebugExceptionDelivery) { 1846 LOG(INFO) << "Handler is upcall"; 1847 } 1848 } else { 1849 CHECK(!is_deoptimization_); 1850 if (instrumentation_frames_to_pop_ > 0) { 1851 // Don't pop the instrumentation frame of the catch handler. 1852 instrumentation_frames_to_pop_--; 1853 } 1854 if (kDebugExceptionDelivery) { 1855 const DexFile& dex_file = *catch_method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1856 int line_number = dex_file.GetLineNumFromPC(catch_method, handler_dex_pc_); 1857 LOG(INFO) << "Handler: " << PrettyMethod(catch_method) << " (line: " << line_number << ")"; 1858 } 1859 } 1860 // Put exception back in root set and clear throw location. 1861 self_->SetException(ThrowLocation(), exception_); 1862 self_->EndAssertNoThreadSuspension(last_no_assert_suspension_cause_); 1863 // Do instrumentation events after allowing thread suspension again. 1864 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 1865 for (size_t i = 0; i < instrumentation_frames_to_pop_; ++i) { 1866 // We pop the instrumentation stack here so as not to corrupt it during the stack walk. 1867 instrumentation->PopMethodForUnwind(self_, is_deoptimization_); 1868 } 1869 if (!is_deoptimization_) { 1870 instrumentation->ExceptionCaughtEvent(self_, throw_location_, catch_method, handler_dex_pc_, 1871 exception_); 1872 } else { 1873 // TODO: proper return value. 1874 self_->SetDeoptimizationShadowFrame(top_shadow_frame_); 1875 } 1876 // Place context back on thread so it will be available when we continue. 1877 self_->ReleaseLongJumpContext(context_); 1878 context_->SetSP(reinterpret_cast<uintptr_t>(handler_quick_frame_)); 1879 CHECK_NE(handler_quick_frame_pc_, 0u); 1880 context_->SetPC(handler_quick_frame_pc_); 1881 context_->SmashCallerSaves(); 1882 context_->DoLongJump(); 1883 } 1884 1885 private: 1886 Thread* const self_; 1887 mirror::Throwable* const exception_; 1888 const bool is_deoptimization_; 1889 // The type of the exception catch block to find. 1890 mirror::Class* const to_find_; 1891 // Location of the throw. 1892 const ThrowLocation& throw_location_; 1893 // Quick frame with found handler or last frame if no handler found. 1894 mirror::AbstractMethod** handler_quick_frame_; 1895 // PC to branch to for the handler. 1896 uintptr_t handler_quick_frame_pc_; 1897 // Associated dex PC. 1898 uint32_t handler_dex_pc_; 1899 // Number of native methods passed in crawl (equates to number of SIRTs to pop) 1900 uint32_t native_method_count_; 1901 // Is method tracing active? 1902 const bool method_tracing_active_; 1903 // Support for nesting no thread suspension checks. 1904 const char* last_no_assert_suspension_cause_; 1905 // Number of frames to pop in long jump. 1906 size_t instrumentation_frames_to_pop_; 1907 ShadowFrame* top_shadow_frame_; 1908 ShadowFrame* prev_shadow_frame_; 1909}; 1910 1911void Thread::QuickDeliverException() { 1912 // Get exception from thread. 1913 ThrowLocation throw_location; 1914 mirror::Throwable* exception = GetException(&throw_location); 1915 CHECK(exception != NULL); 1916 // Don't leave exception visible while we try to find the handler, which may cause class 1917 // resolution. 1918 ClearException(); 1919 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1920 if (kDebugExceptionDelivery) { 1921 if (!is_deoptimization) { 1922 mirror::String* msg = exception->GetDetailMessage(); 1923 std::string str_msg(msg != NULL ? msg->ToModifiedUtf8() : ""); 1924 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1925 << ": " << str_msg << "\n"); 1926 } else { 1927 DumpStack(LOG(INFO) << "Deoptimizing: "); 1928 } 1929 } 1930 CatchBlockStackVisitor catch_finder(this, throw_location, exception, is_deoptimization); 1931 catch_finder.WalkStack(true); 1932 catch_finder.DoLongJump(); 1933 LOG(FATAL) << "UNREACHABLE"; 1934} 1935 1936Context* Thread::GetLongJumpContext() { 1937 Context* result = long_jump_context_; 1938 if (result == NULL) { 1939 result = Context::Create(); 1940 } else { 1941 long_jump_context_ = NULL; // Avoid context being shared. 1942 result->Reset(); 1943 } 1944 return result; 1945} 1946 1947struct CurrentMethodVisitor : public StackVisitor { 1948 CurrentMethodVisitor(Thread* thread, Context* context) 1949 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1950 : StackVisitor(thread, context), this_object_(NULL), method_(NULL), dex_pc_(0) {} 1951 virtual bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1952 mirror::AbstractMethod* m = GetMethod(); 1953 if (m->IsRuntimeMethod()) { 1954 // Continue if this is a runtime method. 1955 return true; 1956 } 1957 if (context_ != NULL) { 1958 this_object_ = GetThisObject(); 1959 } 1960 method_ = m; 1961 dex_pc_ = GetDexPc(); 1962 return false; 1963 } 1964 mirror::Object* this_object_; 1965 mirror::AbstractMethod* method_; 1966 uint32_t dex_pc_; 1967}; 1968 1969mirror::AbstractMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1970 CurrentMethodVisitor visitor(const_cast<Thread*>(this), NULL); 1971 visitor.WalkStack(false); 1972 if (dex_pc != NULL) { 1973 *dex_pc = visitor.dex_pc_; 1974 } 1975 return visitor.method_; 1976} 1977 1978ThrowLocation Thread::GetCurrentLocationForThrow() { 1979 Context* context = GetLongJumpContext(); 1980 CurrentMethodVisitor visitor(this, context); 1981 visitor.WalkStack(false); 1982 ReleaseLongJumpContext(context); 1983 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1984} 1985 1986bool Thread::HoldsLock(mirror::Object* object) { 1987 if (object == NULL) { 1988 return false; 1989 } 1990 return object->GetThinLockId() == thin_lock_id_; 1991} 1992 1993// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1994template <typename RootVisitor> 1995class ReferenceMapVisitor : public StackVisitor { 1996 public: 1997 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1998 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1999 : StackVisitor(thread, context), visitor_(visitor) {} 2000 2001 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2002 if (false) { 2003 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2004 << StringPrintf("@ PC:%04x", GetDexPc()); 2005 } 2006 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2007 if (shadow_frame != NULL) { 2008 mirror::AbstractMethod* m = shadow_frame->GetMethod(); 2009 size_t num_regs = shadow_frame->NumberOfVRegs(); 2010 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2011 // SIRT for JNI or References for interpreter. 2012 for (size_t reg = 0; reg < num_regs; ++reg) { 2013 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2014 if (ref != NULL) { 2015 visitor_(ref, reg, this); 2016 } 2017 } 2018 } else { 2019 // Java method. 2020 // Portable path use DexGcMap and store in Method.native_gc_map_. 2021 const uint8_t* gc_map = m->GetNativeGcMap(); 2022 CHECK(gc_map != NULL) << PrettyMethod(m); 2023 uint32_t gc_map_length = static_cast<uint32_t>((gc_map[0] << 24) | 2024 (gc_map[1] << 16) | 2025 (gc_map[2] << 8) | 2026 (gc_map[3] << 0)); 2027 verifier::DexPcToReferenceMap dex_gc_map(gc_map + 4, gc_map_length); 2028 uint32_t dex_pc = GetDexPc(); 2029 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2030 DCHECK(reg_bitmap != NULL); 2031 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2032 for (size_t reg = 0; reg < num_regs; ++reg) { 2033 if (TestBitmap(reg, reg_bitmap)) { 2034 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2035 if (ref != NULL) { 2036 visitor_(ref, reg, this); 2037 } 2038 } 2039 } 2040 } 2041 } else { 2042 mirror::AbstractMethod* m = GetMethod(); 2043 // Process register map (which native and runtime methods don't have) 2044 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2045 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2046 CHECK(native_gc_map != NULL) << PrettyMethod(m); 2047 mh_.ChangeMethod(m); 2048 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 2049 DCHECK(code_item != NULL) << PrettyMethod(m); // Can't be NULL or how would we compile its instructions? 2050 NativePcOffsetToReferenceMap map(native_gc_map); 2051 size_t num_regs = std::min(map.RegWidth() * 8, 2052 static_cast<size_t>(code_item->registers_size_)); 2053 if (num_regs > 0) { 2054 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 2055 DCHECK(reg_bitmap != NULL); 2056 const VmapTable vmap_table(m->GetVmapTableRaw()); 2057 uint32_t core_spills = m->GetCoreSpillMask(); 2058 uint32_t fp_spills = m->GetFpSpillMask(); 2059 size_t frame_size = m->GetFrameSizeInBytes(); 2060 // For all dex registers in the bitmap 2061 mirror::AbstractMethod** cur_quick_frame = GetCurrentQuickFrame(); 2062 DCHECK(cur_quick_frame != NULL); 2063 for (size_t reg = 0; reg < num_regs; ++reg) { 2064 // Does this register hold a reference? 2065 if (TestBitmap(reg, reg_bitmap)) { 2066 uint32_t vmap_offset; 2067 mirror::Object* ref; 2068 if (vmap_table.IsInContext(reg, vmap_offset, kReferenceVReg)) { 2069 uintptr_t val = GetGPR(vmap_table.ComputeRegister(core_spills, vmap_offset, 2070 kReferenceVReg)); 2071 ref = reinterpret_cast<mirror::Object*>(val); 2072 } else { 2073 ref = reinterpret_cast<mirror::Object*>(GetVReg(cur_quick_frame, code_item, 2074 core_spills, fp_spills, frame_size, 2075 reg)); 2076 } 2077 2078 if (ref != NULL) { 2079 visitor_(ref, reg, this); 2080 } 2081 } 2082 } 2083 } 2084 } 2085 } 2086 return true; 2087 } 2088 2089 private: 2090 static bool TestBitmap(int reg, const uint8_t* reg_vector) { 2091 return ((reg_vector[reg / 8] >> (reg % 8)) & 0x01) != 0; 2092 } 2093 2094 // Visitor for when we visit a root. 2095 const RootVisitor& visitor_; 2096 2097 // A method helper we keep around to avoid dex file/cache re-computations. 2098 MethodHelper mh_; 2099}; 2100 2101class RootCallbackVisitor { 2102 public: 2103 RootCallbackVisitor(RootVisitor* visitor, void* arg) : visitor_(visitor), arg_(arg) { 2104 2105 } 2106 2107 void operator()(const mirror::Object* obj, size_t, const StackVisitor*) const { 2108 visitor_(obj, arg_); 2109 } 2110 2111 private: 2112 RootVisitor* visitor_; 2113 void* arg_; 2114}; 2115 2116class VerifyCallbackVisitor { 2117 public: 2118 VerifyCallbackVisitor(VerifyRootVisitor* visitor, void* arg) 2119 : visitor_(visitor), 2120 arg_(arg) { 2121 } 2122 2123 void operator()(const mirror::Object* obj, size_t vreg, const StackVisitor* visitor) const { 2124 visitor_(obj, arg_, vreg, visitor); 2125 } 2126 2127 private: 2128 VerifyRootVisitor* const visitor_; 2129 void* const arg_; 2130}; 2131 2132struct VerifyRootWrapperArg { 2133 VerifyRootVisitor* visitor; 2134 void* arg; 2135}; 2136 2137static void VerifyRootWrapperCallback(const mirror::Object* root, void* arg) { 2138 VerifyRootWrapperArg* wrapperArg = reinterpret_cast<VerifyRootWrapperArg*>(arg); 2139 wrapperArg->visitor(root, wrapperArg->arg, 0, NULL); 2140} 2141 2142void Thread::VerifyRoots(VerifyRootVisitor* visitor, void* arg) { 2143 // We need to map from a RootVisitor to VerifyRootVisitor, so pass in nulls for arguments we 2144 // don't have. 2145 VerifyRootWrapperArg wrapperArg; 2146 wrapperArg.arg = arg; 2147 wrapperArg.visitor = visitor; 2148 2149 if (opeer_ != NULL) { 2150 VerifyRootWrapperCallback(opeer_, &wrapperArg); 2151 } 2152 if (exception_ != NULL) { 2153 VerifyRootWrapperCallback(exception_, &wrapperArg); 2154 } 2155 throw_location_.VisitRoots(VerifyRootWrapperCallback, &wrapperArg); 2156 if (class_loader_override_ != NULL) { 2157 VerifyRootWrapperCallback(class_loader_override_, &wrapperArg); 2158 } 2159 jni_env_->locals.VisitRoots(VerifyRootWrapperCallback, &wrapperArg); 2160 jni_env_->monitors.VisitRoots(VerifyRootWrapperCallback, &wrapperArg); 2161 2162 SirtVisitRoots(VerifyRootWrapperCallback, &wrapperArg); 2163 2164 // Visit roots on this thread's stack 2165 Context* context = GetLongJumpContext(); 2166 VerifyCallbackVisitor visitorToCallback(visitor, arg); 2167 ReferenceMapVisitor<VerifyCallbackVisitor> mapper(this, context, visitorToCallback); 2168 mapper.WalkStack(); 2169 ReleaseLongJumpContext(context); 2170 2171 std::deque<instrumentation::InstrumentationStackFrame>* instrumentation_stack = GetInstrumentationStack(); 2172 typedef std::deque<instrumentation::InstrumentationStackFrame>::const_iterator It; 2173 for (It it = instrumentation_stack->begin(), end = instrumentation_stack->end(); it != end; ++it) { 2174 mirror::Object* this_object = (*it).this_object_; 2175 if (this_object != NULL) { 2176 VerifyRootWrapperCallback(this_object, &wrapperArg); 2177 } 2178 mirror::AbstractMethod* method = (*it).method_; 2179 VerifyRootWrapperCallback(method, &wrapperArg); 2180 } 2181} 2182 2183void Thread::VisitRoots(RootVisitor* visitor, void* arg) { 2184 if (opeer_ != NULL) { 2185 visitor(opeer_, arg); 2186 } 2187 if (exception_ != NULL) { 2188 visitor(exception_, arg); 2189 } 2190 throw_location_.VisitRoots(visitor, arg); 2191 if (class_loader_override_ != NULL) { 2192 visitor(class_loader_override_, arg); 2193 } 2194 jni_env_->locals.VisitRoots(visitor, arg); 2195 jni_env_->monitors.VisitRoots(visitor, arg); 2196 2197 SirtVisitRoots(visitor, arg); 2198 2199 // Visit roots on this thread's stack 2200 Context* context = GetLongJumpContext(); 2201 RootCallbackVisitor visitorToCallback(visitor, arg); 2202 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2203 mapper.WalkStack(); 2204 ReleaseLongJumpContext(context); 2205 2206 std::deque<instrumentation::InstrumentationStackFrame>* instrumentation_stack = GetInstrumentationStack(); 2207 typedef std::deque<instrumentation::InstrumentationStackFrame>::const_iterator It; 2208 for (It it = instrumentation_stack->begin(), end = instrumentation_stack->end(); it != end; ++it) { 2209 mirror::Object* this_object = (*it).this_object_; 2210 if (this_object != NULL) { 2211 visitor(this_object, arg); 2212 } 2213 mirror::AbstractMethod* method = (*it).method_; 2214 visitor(method, arg); 2215 } 2216} 2217 2218static void VerifyObject(const mirror::Object* root, void* arg) { 2219 gc::Heap* heap = reinterpret_cast<gc::Heap*>(arg); 2220 heap->VerifyObject(root); 2221} 2222 2223void Thread::VerifyStackImpl() { 2224 UniquePtr<Context> context(Context::Create()); 2225 RootCallbackVisitor visitorToCallback(VerifyObject, Runtime::Current()->GetHeap()); 2226 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2227 mapper.WalkStack(); 2228} 2229 2230// Set the stack end to that to be used during a stack overflow 2231void Thread::SetStackEndForStackOverflow() { 2232 // During stack overflow we allow use of the full stack 2233 if (stack_end_ == stack_begin_) { 2234 DumpStack(std::cerr); 2235 LOG(FATAL) << "Need to increase kStackOverflowReservedBytes (currently " 2236 << kStackOverflowReservedBytes << ")"; 2237 } 2238 2239 stack_end_ = stack_begin_; 2240} 2241 2242std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2243 thread.ShortDump(os); 2244 return os; 2245} 2246 2247} // namespace art 2248