thread.cc revision 7940e44f4517de5e2634a7e07d58d0fb26160513
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 mu(Thread::Current(), *Locks::thread_suspend_count_lock_); // Keep GCC happy. 925 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 926 *Locks::thread_suspend_count_lock_); 927 } 928 929 // Allocate a TLS slot. 930 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 931 932 // Double-check the TLS slot allocation. 933 if (pthread_getspecific(pthread_key_self_) != NULL) { 934 LOG(FATAL) << "Newly-created pthread TLS slot is not NULL"; 935 } 936} 937 938void Thread::FinishStartup() { 939 Runtime* runtime = Runtime::Current(); 940 CHECK(runtime->IsStarted()); 941 942 // Finish attaching the main thread. 943 ScopedObjectAccess soa(Thread::Current()); 944 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 945 946 Runtime::Current()->GetClassLinker()->RunRootClinits(); 947} 948 949void Thread::Shutdown() { 950 CHECK(is_started_); 951 is_started_ = false; 952 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 953 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 954 if (resume_cond_ != NULL) { 955 delete resume_cond_; 956 resume_cond_ = NULL; 957 } 958} 959 960Thread::Thread(bool daemon) 961 : suspend_count_(0), 962 card_table_(NULL), 963 exception_(NULL), 964 stack_end_(NULL), 965 managed_stack_(), 966 jni_env_(NULL), 967 self_(NULL), 968 opeer_(NULL), 969 jpeer_(NULL), 970 stack_begin_(NULL), 971 stack_size_(0), 972 thin_lock_id_(0), 973 tid_(0), 974 wait_mutex_(new Mutex("a thread wait mutex")), 975 wait_cond_(new ConditionVariable("a thread wait condition variable", *wait_mutex_)), 976 wait_monitor_(NULL), 977 interrupted_(false), 978 wait_next_(NULL), 979 monitor_enter_object_(NULL), 980 top_sirt_(NULL), 981 runtime_(NULL), 982 class_loader_override_(NULL), 983 long_jump_context_(NULL), 984 throwing_OutOfMemoryError_(false), 985 debug_suspend_count_(0), 986 debug_invoke_req_(new DebugInvokeReq), 987 deoptimization_shadow_frame_(NULL), 988 instrumentation_stack_(new std::deque<instrumentation::InstrumentationStackFrame>), 989 name_(new std::string(kThreadNameDuringStartup)), 990 daemon_(daemon), 991 pthread_self_(0), 992 no_thread_suspension_(0), 993 last_no_thread_suspension_cause_(NULL), 994 checkpoint_function_(0), 995 thread_exit_check_count_(0) { 996 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 997 state_and_flags_.as_struct.flags = 0; 998 state_and_flags_.as_struct.state = kNative; 999 memset(&held_mutexes_[0], 0, sizeof(held_mutexes_)); 1000} 1001 1002bool Thread::IsStillStarting() const { 1003 // You might think you can check whether the state is kStarting, but for much of thread startup, 1004 // the thread is in kNative; it might also be in kVmWait. 1005 // You might think you can check whether the peer is NULL, but the peer is actually created and 1006 // assigned fairly early on, and needs to be. 1007 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1008 // this thread _ever_ entered kRunnable". 1009 return (jpeer_ == NULL && opeer_ == NULL) || (*name_ == kThreadNameDuringStartup); 1010} 1011 1012void Thread::AssertNoPendingException() const { 1013 if (UNLIKELY(IsExceptionPending())) { 1014 ScopedObjectAccess soa(Thread::Current()); 1015 mirror::Throwable* exception = GetException(NULL); 1016 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1017 } 1018} 1019 1020static void MonitorExitVisitor(const mirror::Object* object, void* arg) NO_THREAD_SAFETY_ANALYSIS { 1021 Thread* self = reinterpret_cast<Thread*>(arg); 1022 mirror::Object* entered_monitor = const_cast<mirror::Object*>(object); 1023 if (self->HoldsLock(entered_monitor)) { 1024 LOG(WARNING) << "Calling MonitorExit on object " 1025 << object << " (" << PrettyTypeOf(object) << ")" 1026 << " left locked by native thread " 1027 << *Thread::Current() << " which is detaching"; 1028 entered_monitor->MonitorExit(self); 1029 } 1030} 1031 1032void Thread::Destroy() { 1033 Thread* self = this; 1034 DCHECK_EQ(self, Thread::Current()); 1035 1036 if (opeer_ != NULL) { 1037 ScopedObjectAccess soa(self); 1038 // We may need to call user-supplied managed code, do this before final clean-up. 1039 HandleUncaughtExceptions(soa); 1040 RemoveFromThreadGroup(soa); 1041 1042 // this.nativePeer = 0; 1043 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetInt(opeer_, 0); 1044 Dbg::PostThreadDeath(self); 1045 1046 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1047 // who is waiting. 1048 mirror::Object* lock = 1049 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 1050 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1051 if (lock != NULL) { 1052 ObjectLock locker(self, lock); 1053 locker.Notify(); 1054 } 1055 } 1056 1057 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1058 if (jni_env_ != NULL) { 1059 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self); 1060 } 1061} 1062 1063Thread::~Thread() { 1064 if (jni_env_ != NULL && jpeer_ != NULL) { 1065 // If pthread_create fails we don't have a jni env here. 1066 jni_env_->DeleteGlobalRef(jpeer_); 1067 jpeer_ = NULL; 1068 } 1069 opeer_ = NULL; 1070 1071 delete jni_env_; 1072 jni_env_ = NULL; 1073 1074 CHECK_NE(GetState(), kRunnable); 1075 // We may be deleting a still born thread. 1076 SetStateUnsafe(kTerminated); 1077 1078 delete wait_cond_; 1079 delete wait_mutex_; 1080 1081 if (long_jump_context_ != NULL) { 1082 delete long_jump_context_; 1083 } 1084 1085 delete debug_invoke_req_; 1086 delete instrumentation_stack_; 1087 delete name_; 1088 1089 TearDownAlternateSignalStack(); 1090} 1091 1092void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1093 if (!IsExceptionPending()) { 1094 return; 1095 } 1096 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1097 ScopedThreadStateChange tsc(this, kNative); 1098 1099 // Get and clear the exception. 1100 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1101 jni_env_->ExceptionClear(); 1102 1103 // If the thread has its own handler, use that. 1104 ScopedLocalRef<jobject> handler(jni_env_, 1105 jni_env_->GetObjectField(peer.get(), 1106 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1107 if (handler.get() == NULL) { 1108 // Otherwise use the thread group's default handler. 1109 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1110 } 1111 1112 // Call the handler. 1113 jni_env_->CallVoidMethod(handler.get(), 1114 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1115 peer.get(), exception.get()); 1116 1117 // If the handler threw, clear that exception too. 1118 jni_env_->ExceptionClear(); 1119} 1120 1121void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1122 // this.group.removeThread(this); 1123 // group can be null if we're in the compiler or a test. 1124 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1125 if (ogroup != NULL) { 1126 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1127 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1128 ScopedThreadStateChange tsc(soa.Self(), kNative); 1129 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1130 peer.get()); 1131 } 1132} 1133 1134size_t Thread::NumSirtReferences() { 1135 size_t count = 0; 1136 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1137 count += cur->NumberOfReferences(); 1138 } 1139 return count; 1140} 1141 1142bool Thread::SirtContains(jobject obj) const { 1143 mirror::Object** sirt_entry = reinterpret_cast<mirror::Object**>(obj); 1144 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1145 if (cur->Contains(sirt_entry)) { 1146 return true; 1147 } 1148 } 1149 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1150 return managed_stack_.ShadowFramesContain(sirt_entry); 1151} 1152 1153void Thread::SirtVisitRoots(RootVisitor* visitor, void* arg) { 1154 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1155 size_t num_refs = cur->NumberOfReferences(); 1156 for (size_t j = 0; j < num_refs; j++) { 1157 mirror::Object* object = cur->GetReference(j); 1158 if (object != NULL) { 1159 visitor(object, arg); 1160 } 1161 } 1162 } 1163} 1164 1165mirror::Object* Thread::DecodeJObject(jobject obj) const { 1166 Locks::mutator_lock_->AssertSharedHeld(this); 1167 if (obj == NULL) { 1168 return NULL; 1169 } 1170 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1171 IndirectRefKind kind = GetIndirectRefKind(ref); 1172 mirror::Object* result; 1173 // The "kinds" below are sorted by the frequency we expect to encounter them. 1174 if (kind == kLocal) { 1175 IndirectReferenceTable& locals = jni_env_->locals; 1176 result = const_cast<mirror::Object*>(locals.Get(ref)); 1177 } else if (kind == kSirtOrInvalid) { 1178 // TODO: make stack indirect reference table lookup more efficient 1179 // Check if this is a local reference in the SIRT 1180 if (LIKELY(SirtContains(obj))) { 1181 result = *reinterpret_cast<mirror::Object**>(obj); // Read from SIRT 1182 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1183 // Assume an invalid local reference is actually a direct pointer. 1184 result = reinterpret_cast<mirror::Object*>(obj); 1185 } else { 1186 result = kInvalidIndirectRefObject; 1187 } 1188 } else if (kind == kGlobal) { 1189 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1190 IndirectReferenceTable& globals = vm->globals; 1191 MutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1192 result = const_cast<mirror::Object*>(globals.Get(ref)); 1193 } else { 1194 DCHECK_EQ(kind, kWeakGlobal); 1195 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1196 IndirectReferenceTable& weak_globals = vm->weak_globals; 1197 MutexLock mu(const_cast<Thread*>(this), vm->weak_globals_lock); 1198 result = const_cast<mirror::Object*>(weak_globals.Get(ref)); 1199 if (result == kClearedJniWeakGlobal) { 1200 // This is a special case where it's okay to return NULL. 1201 return NULL; 1202 } 1203 } 1204 1205 if (UNLIKELY(result == NULL)) { 1206 JniAbortF(NULL, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1207 } else { 1208 if (kIsDebugBuild && (result != kInvalidIndirectRefObject)) { 1209 Runtime::Current()->GetHeap()->VerifyObject(result); 1210 } 1211 } 1212 return result; 1213} 1214 1215// Implements java.lang.Thread.interrupted. 1216bool Thread::Interrupted() { 1217 MutexLock mu(Thread::Current(), *wait_mutex_); 1218 bool interrupted = interrupted_; 1219 interrupted_ = false; 1220 return interrupted; 1221} 1222 1223// Implements java.lang.Thread.isInterrupted. 1224bool Thread::IsInterrupted() { 1225 MutexLock mu(Thread::Current(), *wait_mutex_); 1226 return interrupted_; 1227} 1228 1229void Thread::Interrupt() { 1230 Thread* self = Thread::Current(); 1231 MutexLock mu(self, *wait_mutex_); 1232 if (interrupted_) { 1233 return; 1234 } 1235 interrupted_ = true; 1236 NotifyLocked(self); 1237} 1238 1239void Thread::Notify() { 1240 Thread* self = Thread::Current(); 1241 MutexLock mu(self, *wait_mutex_); 1242 NotifyLocked(self); 1243} 1244 1245void Thread::NotifyLocked(Thread* self) { 1246 if (wait_monitor_ != NULL) { 1247 wait_cond_->Signal(self); 1248 } 1249} 1250 1251class CountStackDepthVisitor : public StackVisitor { 1252 public: 1253 CountStackDepthVisitor(Thread* thread) 1254 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1255 : StackVisitor(thread, NULL), 1256 depth_(0), skip_depth_(0), skipping_(true) {} 1257 1258 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1259 // We want to skip frames up to and including the exception's constructor. 1260 // Note we also skip the frame if it doesn't have a method (namely the callee 1261 // save frame) 1262 mirror::AbstractMethod* m = GetMethod(); 1263 if (skipping_ && !m->IsRuntimeMethod() && 1264 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1265 skipping_ = false; 1266 } 1267 if (!skipping_) { 1268 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1269 ++depth_; 1270 } 1271 } else { 1272 ++skip_depth_; 1273 } 1274 return true; 1275 } 1276 1277 int GetDepth() const { 1278 return depth_; 1279 } 1280 1281 int GetSkipDepth() const { 1282 return skip_depth_; 1283 } 1284 1285 private: 1286 uint32_t depth_; 1287 uint32_t skip_depth_; 1288 bool skipping_; 1289}; 1290 1291class BuildInternalStackTraceVisitor : public StackVisitor { 1292 public: 1293 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1294 : StackVisitor(thread, NULL), self_(self), 1295 skip_depth_(skip_depth), count_(0), dex_pc_trace_(NULL), method_trace_(NULL) {} 1296 1297 bool Init(int depth) 1298 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1299 // Allocate method trace with an extra slot that will hold the PC trace 1300 SirtRef<mirror::ObjectArray<mirror::Object> > 1301 method_trace(self_, 1302 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1303 depth + 1)); 1304 if (method_trace.get() == NULL) { 1305 return false; 1306 } 1307 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1308 if (dex_pc_trace == NULL) { 1309 return false; 1310 } 1311 // Save PC trace in last element of method trace, also places it into the 1312 // object graph. 1313 method_trace->Set(depth, dex_pc_trace); 1314 // Set the Object*s and assert that no thread suspension is now possible. 1315 const char* last_no_suspend_cause = 1316 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1317 CHECK(last_no_suspend_cause == NULL) << last_no_suspend_cause; 1318 method_trace_ = method_trace.get(); 1319 dex_pc_trace_ = dex_pc_trace; 1320 return true; 1321 } 1322 1323 virtual ~BuildInternalStackTraceVisitor() { 1324 if (method_trace_ != NULL) { 1325 self_->EndAssertNoThreadSuspension(NULL); 1326 } 1327 } 1328 1329 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1330 if (method_trace_ == NULL || dex_pc_trace_ == NULL) { 1331 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1332 } 1333 if (skip_depth_ > 0) { 1334 skip_depth_--; 1335 return true; 1336 } 1337 mirror::AbstractMethod* m = GetMethod(); 1338 if (m->IsRuntimeMethod()) { 1339 return true; // Ignore runtime frames (in particular callee save). 1340 } 1341 method_trace_->Set(count_, m); 1342 dex_pc_trace_->Set(count_, GetDexPc()); 1343 ++count_; 1344 return true; 1345 } 1346 1347 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1348 return method_trace_; 1349 } 1350 1351 private: 1352 Thread* const self_; 1353 // How many more frames to skip. 1354 int32_t skip_depth_; 1355 // Current position down stack trace. 1356 uint32_t count_; 1357 // Array of dex PC values. 1358 mirror::IntArray* dex_pc_trace_; 1359 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1360 mirror::ObjectArray<mirror::Object>* method_trace_; 1361}; 1362 1363jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1364 // Compute depth of stack 1365 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1366 count_visitor.WalkStack(); 1367 int32_t depth = count_visitor.GetDepth(); 1368 int32_t skip_depth = count_visitor.GetSkipDepth(); 1369 1370 // Build internal stack trace. 1371 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1372 skip_depth); 1373 if (!build_trace_visitor.Init(depth)) { 1374 return NULL; // Allocation failed. 1375 } 1376 build_trace_visitor.WalkStack(); 1377 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1378 if (kIsDebugBuild) { 1379 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1380 CHECK(trace->Get(i) != NULL); 1381 } 1382 } 1383 return soa.AddLocalReference<jobjectArray>(trace); 1384} 1385 1386jobjectArray Thread::InternalStackTraceToStackTraceElementArray(JNIEnv* env, jobject internal, 1387 jobjectArray output_array, int* stack_depth) { 1388 // Transition into runnable state to work on Object*/Array* 1389 ScopedObjectAccess soa(env); 1390 // Decode the internal stack trace into the depth, method trace and PC trace 1391 mirror::ObjectArray<mirror::Object>* method_trace = 1392 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1393 int32_t depth = method_trace->GetLength() - 1; 1394 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1395 1396 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1397 1398 jobjectArray result; 1399 mirror::ObjectArray<mirror::StackTraceElement>* java_traces; 1400 if (output_array != NULL) { 1401 // Reuse the array we were given. 1402 result = output_array; 1403 java_traces = soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(output_array); 1404 // ...adjusting the number of frames we'll write to not exceed the array length. 1405 depth = std::min(depth, java_traces->GetLength()); 1406 } else { 1407 // Create java_trace array and place in local reference table 1408 java_traces = class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1409 if (java_traces == NULL) { 1410 return NULL; 1411 } 1412 result = soa.AddLocalReference<jobjectArray>(java_traces); 1413 } 1414 1415 if (stack_depth != NULL) { 1416 *stack_depth = depth; 1417 } 1418 1419 MethodHelper mh; 1420 for (int32_t i = 0; i < depth; ++i) { 1421 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1422 mirror::AbstractMethod* method = down_cast<mirror::AbstractMethod*>(method_trace->Get(i)); 1423 mh.ChangeMethod(method); 1424 uint32_t dex_pc = pc_trace->Get(i); 1425 int32_t line_number = mh.GetLineNumFromDexPC(dex_pc); 1426 // Allocate element, potentially triggering GC 1427 // TODO: reuse class_name_object via Class::name_? 1428 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1429 CHECK(descriptor != NULL); 1430 std::string class_name(PrettyDescriptor(descriptor)); 1431 SirtRef<mirror::String> class_name_object(soa.Self(), 1432 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1433 class_name.c_str())); 1434 if (class_name_object.get() == NULL) { 1435 return NULL; 1436 } 1437 const char* method_name = mh.GetName(); 1438 CHECK(method_name != NULL); 1439 SirtRef<mirror::String> method_name_object(soa.Self(), 1440 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1441 method_name)); 1442 if (method_name_object.get() == NULL) { 1443 return NULL; 1444 } 1445 const char* source_file = mh.GetDeclaringClassSourceFile(); 1446 SirtRef<mirror::String> source_name_object(soa.Self(), mirror::String::AllocFromModifiedUtf8(soa.Self(), 1447 source_file)); 1448 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc(soa.Self(), 1449 class_name_object.get(), 1450 method_name_object.get(), 1451 source_name_object.get(), 1452 line_number); 1453 if (obj == NULL) { 1454 return NULL; 1455 } 1456#ifdef MOVING_GARBAGE_COLLECTOR 1457 // Re-read after potential GC 1458 java_traces = Decode<ObjectArray<Object>*>(soa.Env(), result); 1459 method_trace = down_cast<ObjectArray<Object>*>(Decode<Object*>(soa.Env(), internal)); 1460 pc_trace = down_cast<IntArray*>(method_trace->Get(depth)); 1461#endif 1462 java_traces->Set(i, obj); 1463 } 1464 return result; 1465} 1466 1467void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1468 const char* exception_class_descriptor, const char* fmt, ...) { 1469 va_list args; 1470 va_start(args, fmt); 1471 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1472 fmt, args); 1473 va_end(args); 1474} 1475 1476void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1477 const char* exception_class_descriptor, 1478 const char* fmt, va_list ap) { 1479 std::string msg; 1480 StringAppendV(&msg, fmt, ap); 1481 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1482} 1483 1484void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1485 const char* msg) { 1486 AssertNoPendingException(); // Callers should either clear or call ThrowNewWrappedException. 1487 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1488} 1489 1490void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1491 const char* exception_class_descriptor, 1492 const char* msg) { 1493 DCHECK_EQ(this, Thread::Current()); 1494 // Ensure we don't forget arguments over object allocation. 1495 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1496 SirtRef<mirror::AbstractMethod> saved_throw_method(this, throw_location.GetMethod()); 1497 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1498 SirtRef<mirror::Throwable> cause(this, GetException(NULL)); 1499 ClearException(); 1500 Runtime* runtime = Runtime::Current(); 1501 1502 mirror::ClassLoader* cl = NULL; 1503 if (throw_location.GetMethod() != NULL) { 1504 cl = throw_location.GetMethod()->GetDeclaringClass()->GetClassLoader(); 1505 } 1506 SirtRef<mirror::Class> 1507 exception_class(this, runtime->GetClassLinker()->FindClass(exception_class_descriptor, cl)); 1508 if (UNLIKELY(exception_class.get() == NULL)) { 1509 CHECK(IsExceptionPending()); 1510 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1511 return; 1512 } 1513 1514 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class.get(), true, true))) { 1515 DCHECK(IsExceptionPending()); 1516 return; 1517 } 1518 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1519 SirtRef<mirror::Throwable> exception(this, 1520 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1521 1522 // Choose an appropriate constructor and set up the arguments. 1523 const char* signature; 1524 SirtRef<mirror::String> msg_string(this, NULL); 1525 if (msg != NULL) { 1526 // Ensure we remember this and the method over the String allocation. 1527 msg_string.reset(mirror::String::AllocFromModifiedUtf8(this, msg)); 1528 if (UNLIKELY(msg_string.get() == NULL)) { 1529 CHECK(IsExceptionPending()); // OOME. 1530 return; 1531 } 1532 if (cause.get() == NULL) { 1533 signature = "(Ljava/lang/String;)V"; 1534 } else { 1535 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1536 } 1537 } else { 1538 if (cause.get() == NULL) { 1539 signature = "()V"; 1540 } else { 1541 signature = "(Ljava/lang/Throwable;)V"; 1542 } 1543 } 1544 mirror::AbstractMethod* exception_init_method = 1545 exception_class->FindDeclaredDirectMethod("<init>", signature); 1546 1547 CHECK(exception_init_method != NULL) << "No <init>" << signature << " in " 1548 << PrettyDescriptor(exception_class_descriptor); 1549 1550 if (UNLIKELY(!runtime->IsStarted())) { 1551 // Something is trying to throw an exception without a started runtime, which is the common 1552 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1553 // the exception fields directly. 1554 if (msg != NULL) { 1555 exception->SetDetailMessage(msg_string.get()); 1556 } 1557 if (cause.get() != NULL) { 1558 exception->SetCause(cause.get()); 1559 } 1560 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1561 throw_location.GetDexPc()); 1562 SetException(gc_safe_throw_location, exception.get()); 1563 } else { 1564 ArgArray args("VLL", 3); 1565 args.Append(reinterpret_cast<uint32_t>(exception.get())); 1566 if (msg != NULL) { 1567 args.Append(reinterpret_cast<uint32_t>(msg_string.get())); 1568 } 1569 if (cause.get() != NULL) { 1570 args.Append(reinterpret_cast<uint32_t>(cause.get())); 1571 } 1572 JValue result; 1573 exception_init_method->Invoke(this, args.GetArray(), args.GetNumBytes(), &result, 'V'); 1574 if (LIKELY(!IsExceptionPending())) { 1575 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1576 throw_location.GetDexPc()); 1577 SetException(gc_safe_throw_location, exception.get()); 1578 } 1579 } 1580} 1581 1582void Thread::ThrowOutOfMemoryError(const char* msg) { 1583 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1584 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1585 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1586 if (!throwing_OutOfMemoryError_) { 1587 throwing_OutOfMemoryError_ = true; 1588 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1589 throwing_OutOfMemoryError_ = false; 1590 } else { 1591 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1592 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1593 } 1594} 1595 1596Thread* Thread::CurrentFromGdb() { 1597 return Thread::Current(); 1598} 1599 1600void Thread::DumpFromGdb() const { 1601 std::ostringstream ss; 1602 Dump(ss); 1603 std::string str(ss.str()); 1604 // log to stderr for debugging command line processes 1605 std::cerr << str; 1606#ifdef HAVE_ANDROID_OS 1607 // log to logcat for debugging frameworks processes 1608 LOG(INFO) << str; 1609#endif 1610} 1611 1612struct EntryPointInfo { 1613 uint32_t offset; 1614 const char* name; 1615}; 1616#define ENTRY_POINT_INFO(x) { ENTRYPOINT_OFFSET(x), #x } 1617static const EntryPointInfo gThreadEntryPointInfo[] = { 1618 ENTRY_POINT_INFO(pAllocArrayFromCode), 1619 ENTRY_POINT_INFO(pAllocArrayFromCodeWithAccessCheck), 1620 ENTRY_POINT_INFO(pAllocObjectFromCode), 1621 ENTRY_POINT_INFO(pAllocObjectFromCodeWithAccessCheck), 1622 ENTRY_POINT_INFO(pCheckAndAllocArrayFromCode), 1623 ENTRY_POINT_INFO(pCheckAndAllocArrayFromCodeWithAccessCheck), 1624 ENTRY_POINT_INFO(pInstanceofNonTrivialFromCode), 1625 ENTRY_POINT_INFO(pCanPutArrayElementFromCode), 1626 ENTRY_POINT_INFO(pCheckCastFromCode), 1627 ENTRY_POINT_INFO(pInitializeStaticStorage), 1628 ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccessFromCode), 1629 ENTRY_POINT_INFO(pInitializeTypeFromCode), 1630 ENTRY_POINT_INFO(pResolveStringFromCode), 1631 ENTRY_POINT_INFO(pSet32Instance), 1632 ENTRY_POINT_INFO(pSet32Static), 1633 ENTRY_POINT_INFO(pSet64Instance), 1634 ENTRY_POINT_INFO(pSet64Static), 1635 ENTRY_POINT_INFO(pSetObjInstance), 1636 ENTRY_POINT_INFO(pSetObjStatic), 1637 ENTRY_POINT_INFO(pGet32Instance), 1638 ENTRY_POINT_INFO(pGet32Static), 1639 ENTRY_POINT_INFO(pGet64Instance), 1640 ENTRY_POINT_INFO(pGet64Static), 1641 ENTRY_POINT_INFO(pGetObjInstance), 1642 ENTRY_POINT_INFO(pGetObjStatic), 1643 ENTRY_POINT_INFO(pHandleFillArrayDataFromCode), 1644 ENTRY_POINT_INFO(pJniMethodStart), 1645 ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1646 ENTRY_POINT_INFO(pJniMethodEnd), 1647 ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1648 ENTRY_POINT_INFO(pJniMethodEndWithReference), 1649 ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1650 ENTRY_POINT_INFO(pLockObjectFromCode), 1651 ENTRY_POINT_INFO(pUnlockObjectFromCode), 1652 ENTRY_POINT_INFO(pCmpgDouble), 1653 ENTRY_POINT_INFO(pCmpgFloat), 1654 ENTRY_POINT_INFO(pCmplDouble), 1655 ENTRY_POINT_INFO(pCmplFloat), 1656 ENTRY_POINT_INFO(pFmod), 1657 ENTRY_POINT_INFO(pSqrt), 1658 ENTRY_POINT_INFO(pL2d), 1659 ENTRY_POINT_INFO(pFmodf), 1660 ENTRY_POINT_INFO(pL2f), 1661 ENTRY_POINT_INFO(pD2iz), 1662 ENTRY_POINT_INFO(pF2iz), 1663 ENTRY_POINT_INFO(pIdivmod), 1664 ENTRY_POINT_INFO(pD2l), 1665 ENTRY_POINT_INFO(pF2l), 1666 ENTRY_POINT_INFO(pLdiv), 1667 ENTRY_POINT_INFO(pLdivmod), 1668 ENTRY_POINT_INFO(pLmul), 1669 ENTRY_POINT_INFO(pShlLong), 1670 ENTRY_POINT_INFO(pShrLong), 1671 ENTRY_POINT_INFO(pUshrLong), 1672 ENTRY_POINT_INFO(pInterpreterToInterpreterEntry), 1673 ENTRY_POINT_INFO(pInterpreterToQuickEntry), 1674 ENTRY_POINT_INFO(pIndexOf), 1675 ENTRY_POINT_INFO(pMemcmp16), 1676 ENTRY_POINT_INFO(pStringCompareTo), 1677 ENTRY_POINT_INFO(pMemcpy), 1678 ENTRY_POINT_INFO(pPortableResolutionTrampolineFromCode), 1679 ENTRY_POINT_INFO(pQuickResolutionTrampolineFromCode), 1680 ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1681 ENTRY_POINT_INFO(pInvokeInterfaceTrampoline), 1682 ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1683 ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1684 ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1685 ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1686 ENTRY_POINT_INFO(pCheckSuspendFromCode), 1687 ENTRY_POINT_INFO(pTestSuspendFromCode), 1688 ENTRY_POINT_INFO(pDeliverException), 1689 ENTRY_POINT_INFO(pThrowArrayBoundsFromCode), 1690 ENTRY_POINT_INFO(pThrowDivZeroFromCode), 1691 ENTRY_POINT_INFO(pThrowNoSuchMethodFromCode), 1692 ENTRY_POINT_INFO(pThrowNullPointerFromCode), 1693 ENTRY_POINT_INFO(pThrowStackOverflowFromCode), 1694}; 1695#undef ENTRY_POINT_INFO 1696 1697void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1698 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1699 1700#define DO_THREAD_OFFSET(x) if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { os << # x; return; } 1701 DO_THREAD_OFFSET(state_and_flags_); 1702 DO_THREAD_OFFSET(card_table_); 1703 DO_THREAD_OFFSET(exception_); 1704 DO_THREAD_OFFSET(opeer_); 1705 DO_THREAD_OFFSET(jni_env_); 1706 DO_THREAD_OFFSET(self_); 1707 DO_THREAD_OFFSET(stack_end_); 1708 DO_THREAD_OFFSET(suspend_count_); 1709 DO_THREAD_OFFSET(thin_lock_id_); 1710 //DO_THREAD_OFFSET(top_of_managed_stack_); 1711 //DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1712 DO_THREAD_OFFSET(top_sirt_); 1713#undef DO_THREAD_OFFSET 1714 1715 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1716 CHECK_EQ(entry_point_count * size_of_pointers, sizeof(EntryPoints)); 1717 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, entrypoints_); 1718 for (size_t i = 0; i < entry_point_count; ++i) { 1719 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1720 expected_offset += size_of_pointers; 1721 if (gThreadEntryPointInfo[i].offset == offset) { 1722 os << gThreadEntryPointInfo[i].name; 1723 return; 1724 } 1725 } 1726 os << offset; 1727} 1728 1729static const bool kDebugExceptionDelivery = false; 1730class CatchBlockStackVisitor : public StackVisitor { 1731 public: 1732 CatchBlockStackVisitor(Thread* self, const ThrowLocation& throw_location, 1733 mirror::Throwable* exception, bool is_deoptimization) 1734 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1735 : StackVisitor(self, self->GetLongJumpContext()), 1736 self_(self), exception_(exception), is_deoptimization_(is_deoptimization), 1737 to_find_(is_deoptimization ? NULL : exception->GetClass()), throw_location_(throw_location), 1738 handler_quick_frame_(NULL), handler_quick_frame_pc_(0), handler_dex_pc_(0), 1739 native_method_count_(0), 1740 method_tracing_active_(is_deoptimization || 1741 Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()), 1742 instrumentation_frames_to_pop_(0), top_shadow_frame_(NULL), prev_shadow_frame_(NULL) { 1743 // Exception not in root sets, can't allow GC. 1744 last_no_assert_suspension_cause_ = self->StartAssertNoThreadSuspension("Finding catch block"); 1745 } 1746 1747 ~CatchBlockStackVisitor() { 1748 LOG(FATAL) << "UNREACHABLE"; // Expected to take long jump. 1749 } 1750 1751 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1752 mirror::AbstractMethod* method = GetMethod(); 1753 if (method == NULL) { 1754 // This is the upcall, we remember the frame and last pc so that we may long jump to them. 1755 handler_quick_frame_pc_ = GetCurrentQuickFramePc(); 1756 handler_quick_frame_ = GetCurrentQuickFrame(); 1757 return false; // End stack walk. 1758 } else { 1759 if (UNLIKELY(method_tracing_active_ && 1760 GetInstrumentationExitPc() == GetReturnPc())) { 1761 // Keep count of the number of unwinds during instrumentation. 1762 instrumentation_frames_to_pop_++; 1763 } 1764 if (method->IsRuntimeMethod()) { 1765 // Ignore callee save method. 1766 DCHECK(method->IsCalleeSaveMethod()); 1767 return true; 1768 } else if (is_deoptimization_) { 1769 return HandleDeoptimization(method); 1770 } else { 1771 return HandleTryItems(method); 1772 } 1773 } 1774 } 1775 1776 bool HandleTryItems(mirror::AbstractMethod* method) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1777 uint32_t dex_pc = DexFile::kDexNoIndex; 1778 if (method->IsNative()) { 1779 native_method_count_++; 1780 } else { 1781 dex_pc = GetDexPc(); 1782 } 1783 if (dex_pc != DexFile::kDexNoIndex) { 1784 uint32_t found_dex_pc = method->FindCatchBlock(to_find_, dex_pc); 1785 if (found_dex_pc != DexFile::kDexNoIndex) { 1786 handler_dex_pc_ = found_dex_pc; 1787 handler_quick_frame_pc_ = method->ToNativePc(found_dex_pc); 1788 handler_quick_frame_ = GetCurrentQuickFrame(); 1789 return false; // End stack walk. 1790 } 1791 } 1792 return true; // Continue stack walk. 1793 } 1794 1795 bool HandleDeoptimization(mirror::AbstractMethod* m) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1796 MethodHelper mh(m); 1797 const DexFile::CodeItem* code_item = mh.GetCodeItem(); 1798 CHECK(code_item != NULL); 1799 uint16_t num_regs = code_item->registers_size_; 1800 uint32_t dex_pc = GetDexPc(); 1801 const Instruction* inst = Instruction::At(code_item->insns_ + dex_pc); 1802 uint32_t new_dex_pc = dex_pc + inst->SizeInCodeUnits(); 1803 ShadowFrame* new_frame = ShadowFrame::Create(num_regs, NULL, m, new_dex_pc); 1804 verifier::MethodVerifier verifier(&mh.GetDexFile(), mh.GetDexCache(), mh.GetClassLoader(), 1805 mh.GetClassDefIndex(), code_item, 1806 m->GetDexMethodIndex(), m, m->GetAccessFlags(), false, true); 1807 verifier.Verify(); 1808 std::vector<int32_t> kinds = verifier.DescribeVRegs(dex_pc); 1809 for(uint16_t reg = 0; reg < num_regs; reg++) { 1810 VRegKind kind = static_cast<VRegKind>(kinds.at(reg * 2)); 1811 switch (kind) { 1812 case kUndefined: 1813 new_frame->SetVReg(reg, 0xEBADDE09); 1814 break; 1815 case kConstant: 1816 new_frame->SetVReg(reg, kinds.at((reg * 2) + 1)); 1817 break; 1818 case kReferenceVReg: 1819 new_frame->SetVRegReference(reg, 1820 reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kind))); 1821 break; 1822 default: 1823 new_frame->SetVReg(reg, GetVReg(m, reg, kind)); 1824 break; 1825 } 1826 } 1827 if (prev_shadow_frame_ != NULL) { 1828 prev_shadow_frame_->SetLink(new_frame); 1829 } else { 1830 top_shadow_frame_ = new_frame; 1831 } 1832 prev_shadow_frame_ = new_frame; 1833 return true; 1834 } 1835 1836 void DoLongJump() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1837 mirror::AbstractMethod* catch_method = *handler_quick_frame_; 1838 if (catch_method == NULL) { 1839 if (kDebugExceptionDelivery) { 1840 LOG(INFO) << "Handler is upcall"; 1841 } 1842 } else { 1843 CHECK(!is_deoptimization_); 1844 if (instrumentation_frames_to_pop_ > 0) { 1845 // Don't pop the instrumentation frame of the catch handler. 1846 instrumentation_frames_to_pop_--; 1847 } 1848 if (kDebugExceptionDelivery) { 1849 const DexFile& dex_file = *catch_method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1850 int line_number = dex_file.GetLineNumFromPC(catch_method, handler_dex_pc_); 1851 LOG(INFO) << "Handler: " << PrettyMethod(catch_method) << " (line: " << line_number << ")"; 1852 } 1853 } 1854 // Put exception back in root set and clear throw location. 1855 self_->SetException(ThrowLocation(), exception_); 1856 self_->EndAssertNoThreadSuspension(last_no_assert_suspension_cause_); 1857 // Do instrumentation events after allowing thread suspension again. 1858 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 1859 for (size_t i = 0; i < instrumentation_frames_to_pop_; ++i) { 1860 // We pop the instrumentation stack here so as not to corrupt it during the stack walk. 1861 instrumentation->PopMethodForUnwind(self_, is_deoptimization_); 1862 } 1863 if (!is_deoptimization_) { 1864 instrumentation->ExceptionCaughtEvent(self_, throw_location_, catch_method, handler_dex_pc_, 1865 exception_); 1866 } else { 1867 // TODO: proper return value. 1868 self_->SetDeoptimizationShadowFrame(top_shadow_frame_); 1869 } 1870 // Place context back on thread so it will be available when we continue. 1871 self_->ReleaseLongJumpContext(context_); 1872 context_->SetSP(reinterpret_cast<uintptr_t>(handler_quick_frame_)); 1873 CHECK_NE(handler_quick_frame_pc_, 0u); 1874 context_->SetPC(handler_quick_frame_pc_); 1875 context_->SmashCallerSaves(); 1876 context_->DoLongJump(); 1877 } 1878 1879 private: 1880 Thread* const self_; 1881 mirror::Throwable* const exception_; 1882 const bool is_deoptimization_; 1883 // The type of the exception catch block to find. 1884 mirror::Class* const to_find_; 1885 // Location of the throw. 1886 const ThrowLocation& throw_location_; 1887 // Quick frame with found handler or last frame if no handler found. 1888 mirror::AbstractMethod** handler_quick_frame_; 1889 // PC to branch to for the handler. 1890 uintptr_t handler_quick_frame_pc_; 1891 // Associated dex PC. 1892 uint32_t handler_dex_pc_; 1893 // Number of native methods passed in crawl (equates to number of SIRTs to pop) 1894 uint32_t native_method_count_; 1895 // Is method tracing active? 1896 const bool method_tracing_active_; 1897 // Support for nesting no thread suspension checks. 1898 const char* last_no_assert_suspension_cause_; 1899 // Number of frames to pop in long jump. 1900 size_t instrumentation_frames_to_pop_; 1901 ShadowFrame* top_shadow_frame_; 1902 ShadowFrame* prev_shadow_frame_; 1903}; 1904 1905void Thread::QuickDeliverException() { 1906 // Get exception from thread. 1907 ThrowLocation throw_location; 1908 mirror::Throwable* exception = GetException(&throw_location); 1909 CHECK(exception != NULL); 1910 // Don't leave exception visible while we try to find the handler, which may cause class 1911 // resolution. 1912 ClearException(); 1913 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1914 if (kDebugExceptionDelivery) { 1915 if (!is_deoptimization) { 1916 mirror::String* msg = exception->GetDetailMessage(); 1917 std::string str_msg(msg != NULL ? msg->ToModifiedUtf8() : ""); 1918 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1919 << ": " << str_msg << "\n"); 1920 } else { 1921 DumpStack(LOG(INFO) << "Deoptimizing: "); 1922 } 1923 } 1924 CatchBlockStackVisitor catch_finder(this, throw_location, exception, is_deoptimization); 1925 catch_finder.WalkStack(true); 1926 catch_finder.DoLongJump(); 1927 LOG(FATAL) << "UNREACHABLE"; 1928} 1929 1930Context* Thread::GetLongJumpContext() { 1931 Context* result = long_jump_context_; 1932 if (result == NULL) { 1933 result = Context::Create(); 1934 } else { 1935 long_jump_context_ = NULL; // Avoid context being shared. 1936 result->Reset(); 1937 } 1938 return result; 1939} 1940 1941struct CurrentMethodVisitor : public StackVisitor { 1942 CurrentMethodVisitor(Thread* thread, Context* context) 1943 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1944 : StackVisitor(thread, context), this_object_(NULL), method_(NULL), dex_pc_(0) {} 1945 virtual bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1946 mirror::AbstractMethod* m = GetMethod(); 1947 if (m->IsRuntimeMethod()) { 1948 // Continue if this is a runtime method. 1949 return true; 1950 } 1951 if (context_ != NULL) { 1952 this_object_ = GetThisObject(); 1953 } 1954 method_ = m; 1955 dex_pc_ = GetDexPc(); 1956 return false; 1957 } 1958 mirror::Object* this_object_; 1959 mirror::AbstractMethod* method_; 1960 uint32_t dex_pc_; 1961}; 1962 1963mirror::AbstractMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1964 CurrentMethodVisitor visitor(const_cast<Thread*>(this), NULL); 1965 visitor.WalkStack(false); 1966 if (dex_pc != NULL) { 1967 *dex_pc = visitor.dex_pc_; 1968 } 1969 return visitor.method_; 1970} 1971 1972ThrowLocation Thread::GetCurrentLocationForThrow() { 1973 Context* context = GetLongJumpContext(); 1974 CurrentMethodVisitor visitor(this, context); 1975 visitor.WalkStack(false); 1976 ReleaseLongJumpContext(context); 1977 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1978} 1979 1980bool Thread::HoldsLock(mirror::Object* object) { 1981 if (object == NULL) { 1982 return false; 1983 } 1984 return object->GetThinLockId() == thin_lock_id_; 1985} 1986 1987// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1988template <typename RootVisitor> 1989class ReferenceMapVisitor : public StackVisitor { 1990 public: 1991 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1992 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1993 : StackVisitor(thread, context), visitor_(visitor) {} 1994 1995 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1996 if (false) { 1997 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1998 << StringPrintf("@ PC:%04x", GetDexPc()); 1999 } 2000 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2001 if (shadow_frame != NULL) { 2002 mirror::AbstractMethod* m = shadow_frame->GetMethod(); 2003 size_t num_regs = shadow_frame->NumberOfVRegs(); 2004 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2005 // SIRT for JNI or References for interpreter. 2006 for (size_t reg = 0; reg < num_regs; ++reg) { 2007 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2008 if (ref != NULL) { 2009 visitor_(ref, reg, this); 2010 } 2011 } 2012 } else { 2013 // Java method. 2014 // Portable path use DexGcMap and store in Method.native_gc_map_. 2015 const uint8_t* gc_map = m->GetNativeGcMap(); 2016 CHECK(gc_map != NULL) << PrettyMethod(m); 2017 uint32_t gc_map_length = static_cast<uint32_t>((gc_map[0] << 24) | 2018 (gc_map[1] << 16) | 2019 (gc_map[2] << 8) | 2020 (gc_map[3] << 0)); 2021 verifier::DexPcToReferenceMap dex_gc_map(gc_map + 4, gc_map_length); 2022 uint32_t dex_pc = GetDexPc(); 2023 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2024 DCHECK(reg_bitmap != NULL); 2025 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2026 for (size_t reg = 0; reg < num_regs; ++reg) { 2027 if (TestBitmap(reg, reg_bitmap)) { 2028 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2029 if (ref != NULL) { 2030 visitor_(ref, reg, this); 2031 } 2032 } 2033 } 2034 } 2035 } else { 2036 mirror::AbstractMethod* m = GetMethod(); 2037 // Process register map (which native and runtime methods don't have) 2038 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2039 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2040 CHECK(native_gc_map != NULL) << PrettyMethod(m); 2041 mh_.ChangeMethod(m); 2042 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 2043 DCHECK(code_item != NULL) << PrettyMethod(m); // Can't be NULL or how would we compile its instructions? 2044 NativePcOffsetToReferenceMap map(native_gc_map); 2045 size_t num_regs = std::min(map.RegWidth() * 8, 2046 static_cast<size_t>(code_item->registers_size_)); 2047 if (num_regs > 0) { 2048 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 2049 DCHECK(reg_bitmap != NULL); 2050 const VmapTable vmap_table(m->GetVmapTableRaw()); 2051 uint32_t core_spills = m->GetCoreSpillMask(); 2052 uint32_t fp_spills = m->GetFpSpillMask(); 2053 size_t frame_size = m->GetFrameSizeInBytes(); 2054 // For all dex registers in the bitmap 2055 mirror::AbstractMethod** cur_quick_frame = GetCurrentQuickFrame(); 2056 DCHECK(cur_quick_frame != NULL); 2057 for (size_t reg = 0; reg < num_regs; ++reg) { 2058 // Does this register hold a reference? 2059 if (TestBitmap(reg, reg_bitmap)) { 2060 uint32_t vmap_offset; 2061 mirror::Object* ref; 2062 if (vmap_table.IsInContext(reg, vmap_offset, kReferenceVReg)) { 2063 uintptr_t val = GetGPR(vmap_table.ComputeRegister(core_spills, vmap_offset, 2064 kReferenceVReg)); 2065 ref = reinterpret_cast<mirror::Object*>(val); 2066 } else { 2067 ref = reinterpret_cast<mirror::Object*>(GetVReg(cur_quick_frame, code_item, 2068 core_spills, fp_spills, frame_size, 2069 reg)); 2070 } 2071 2072 if (ref != NULL) { 2073 visitor_(ref, reg, this); 2074 } 2075 } 2076 } 2077 } 2078 } 2079 } 2080 return true; 2081 } 2082 2083 private: 2084 static bool TestBitmap(int reg, const uint8_t* reg_vector) { 2085 return ((reg_vector[reg / 8] >> (reg % 8)) & 0x01) != 0; 2086 } 2087 2088 // Visitor for when we visit a root. 2089 const RootVisitor& visitor_; 2090 2091 // A method helper we keep around to avoid dex file/cache re-computations. 2092 MethodHelper mh_; 2093}; 2094 2095class RootCallbackVisitor { 2096 public: 2097 RootCallbackVisitor(RootVisitor* visitor, void* arg) : visitor_(visitor), arg_(arg) { 2098 2099 } 2100 2101 void operator()(const mirror::Object* obj, size_t, const StackVisitor*) const { 2102 visitor_(obj, arg_); 2103 } 2104 2105 private: 2106 RootVisitor* visitor_; 2107 void* arg_; 2108}; 2109 2110class VerifyCallbackVisitor { 2111 public: 2112 VerifyCallbackVisitor(VerifyRootVisitor* visitor, void* arg) 2113 : visitor_(visitor), 2114 arg_(arg) { 2115 } 2116 2117 void operator()(const mirror::Object* obj, size_t vreg, const StackVisitor* visitor) const { 2118 visitor_(obj, arg_, vreg, visitor); 2119 } 2120 2121 private: 2122 VerifyRootVisitor* const visitor_; 2123 void* const arg_; 2124}; 2125 2126struct VerifyRootWrapperArg { 2127 VerifyRootVisitor* visitor; 2128 void* arg; 2129}; 2130 2131static void VerifyRootWrapperCallback(const mirror::Object* root, void* arg) { 2132 VerifyRootWrapperArg* wrapperArg = reinterpret_cast<VerifyRootWrapperArg*>(arg); 2133 wrapperArg->visitor(root, wrapperArg->arg, 0, NULL); 2134} 2135 2136void Thread::VerifyRoots(VerifyRootVisitor* visitor, void* arg) { 2137 // We need to map from a RootVisitor to VerifyRootVisitor, so pass in nulls for arguments we 2138 // don't have. 2139 VerifyRootWrapperArg wrapperArg; 2140 wrapperArg.arg = arg; 2141 wrapperArg.visitor = visitor; 2142 2143 if (opeer_ != NULL) { 2144 VerifyRootWrapperCallback(opeer_, &wrapperArg); 2145 } 2146 if (exception_ != NULL) { 2147 VerifyRootWrapperCallback(exception_, &wrapperArg); 2148 } 2149 throw_location_.VisitRoots(VerifyRootWrapperCallback, &wrapperArg); 2150 if (class_loader_override_ != NULL) { 2151 VerifyRootWrapperCallback(class_loader_override_, &wrapperArg); 2152 } 2153 jni_env_->locals.VisitRoots(VerifyRootWrapperCallback, &wrapperArg); 2154 jni_env_->monitors.VisitRoots(VerifyRootWrapperCallback, &wrapperArg); 2155 2156 SirtVisitRoots(VerifyRootWrapperCallback, &wrapperArg); 2157 2158 // Visit roots on this thread's stack 2159 Context* context = GetLongJumpContext(); 2160 VerifyCallbackVisitor visitorToCallback(visitor, arg); 2161 ReferenceMapVisitor<VerifyCallbackVisitor> mapper(this, context, visitorToCallback); 2162 mapper.WalkStack(); 2163 ReleaseLongJumpContext(context); 2164 2165 std::deque<instrumentation::InstrumentationStackFrame>* instrumentation_stack = GetInstrumentationStack(); 2166 typedef std::deque<instrumentation::InstrumentationStackFrame>::const_iterator It; 2167 for (It it = instrumentation_stack->begin(), end = instrumentation_stack->end(); it != end; ++it) { 2168 mirror::Object* this_object = (*it).this_object_; 2169 if (this_object != NULL) { 2170 VerifyRootWrapperCallback(this_object, &wrapperArg); 2171 } 2172 mirror::AbstractMethod* method = (*it).method_; 2173 VerifyRootWrapperCallback(method, &wrapperArg); 2174 } 2175} 2176 2177void Thread::VisitRoots(RootVisitor* visitor, void* arg) { 2178 if (opeer_ != NULL) { 2179 visitor(opeer_, arg); 2180 } 2181 if (exception_ != NULL) { 2182 visitor(exception_, arg); 2183 } 2184 throw_location_.VisitRoots(visitor, arg); 2185 if (class_loader_override_ != NULL) { 2186 visitor(class_loader_override_, arg); 2187 } 2188 jni_env_->locals.VisitRoots(visitor, arg); 2189 jni_env_->monitors.VisitRoots(visitor, arg); 2190 2191 SirtVisitRoots(visitor, arg); 2192 2193 // Visit roots on this thread's stack 2194 Context* context = GetLongJumpContext(); 2195 RootCallbackVisitor visitorToCallback(visitor, arg); 2196 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2197 mapper.WalkStack(); 2198 ReleaseLongJumpContext(context); 2199 2200 std::deque<instrumentation::InstrumentationStackFrame>* instrumentation_stack = GetInstrumentationStack(); 2201 typedef std::deque<instrumentation::InstrumentationStackFrame>::const_iterator It; 2202 for (It it = instrumentation_stack->begin(), end = instrumentation_stack->end(); it != end; ++it) { 2203 mirror::Object* this_object = (*it).this_object_; 2204 if (this_object != NULL) { 2205 visitor(this_object, arg); 2206 } 2207 mirror::AbstractMethod* method = (*it).method_; 2208 visitor(method, arg); 2209 } 2210} 2211 2212static void VerifyObject(const mirror::Object* root, void* arg) { 2213 gc::Heap* heap = reinterpret_cast<gc::Heap*>(arg); 2214 heap->VerifyObject(root); 2215} 2216 2217void Thread::VerifyStackImpl() { 2218 UniquePtr<Context> context(Context::Create()); 2219 RootCallbackVisitor visitorToCallback(VerifyObject, Runtime::Current()->GetHeap()); 2220 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2221 mapper.WalkStack(); 2222} 2223 2224// Set the stack end to that to be used during a stack overflow 2225void Thread::SetStackEndForStackOverflow() { 2226 // During stack overflow we allow use of the full stack 2227 if (stack_end_ == stack_begin_) { 2228 DumpStack(std::cerr); 2229 LOG(FATAL) << "Need to increase kStackOverflowReservedBytes (currently " 2230 << kStackOverflowReservedBytes << ")"; 2231 } 2232 2233 stack_end_ = stack_begin_; 2234} 2235 2236std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2237 thread.ShortDump(os); 2238 return os; 2239} 2240 2241} // namespace art 2242