thread.cc revision 59cde534aa295bad7de29472b3cce9576d7996a8
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define ATRACE_TAG ATRACE_TAG_DALVIK 18 19#include "thread.h" 20 21#include <cutils/trace.h> 22#include <pthread.h> 23#include <signal.h> 24#include <sys/resource.h> 25#include <sys/time.h> 26 27#include <algorithm> 28#include <bitset> 29#include <cerrno> 30#include <iostream> 31#include <list> 32 33#include "arch/context.h" 34#include "base/mutex.h" 35#include "class_linker.h" 36#include "class_linker-inl.h" 37#include "cutils/atomic.h" 38#include "cutils/atomic-inline.h" 39#include "debugger.h" 40#include "dex_file-inl.h" 41#include "entrypoints/entrypoint_utils.h" 42#include "gc_map.h" 43#include "gc/accounting/card_table-inl.h" 44#include "gc/heap.h" 45#include "gc/space/space.h" 46#include "invoke_arg_array_builder.h" 47#include "jni_internal.h" 48#include "mirror/art_field-inl.h" 49#include "mirror/art_method-inl.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/object_array-inl.h" 53#include "mirror/stack_trace_element.h" 54#include "monitor.h" 55#include "object_utils.h" 56#include "reflection.h" 57#include "runtime.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 "vmap_table.h" 70#include "well_known_classes.h" 71 72namespace art { 73 74bool Thread::is_started_ = false; 75pthread_key_t Thread::pthread_key_self_; 76ConditionVariable* Thread::resume_cond_ = NULL; 77 78static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 79 80void Thread::InitCardTable() { 81 card_table_ = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 82} 83 84#if !defined(__APPLE__) 85static void UnimplementedEntryPoint() { 86 UNIMPLEMENTED(FATAL); 87} 88#endif 89 90void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 91 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 92 93void Thread::InitTlsEntryPoints() { 94#if !defined(__APPLE__) // The Mac GCC is too old to accept this code. 95 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 96 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 97 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(quick_entrypoints_)); 98 for (uintptr_t* it = begin; it != end; ++it) { 99 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 100 } 101 begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 102 end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(portable_entrypoints_)); 103 for (uintptr_t* it = begin; it != end; ++it) { 104 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 105 } 106#endif 107 InitEntryPoints(&interpreter_entrypoints_, &jni_entrypoints_, &portable_entrypoints_, 108 &quick_entrypoints_); 109} 110 111void ResetQuickAllocEntryPoints(QuickEntryPoints* qpoints); 112 113void Thread::ResetQuickAllocEntryPointsForThread() { 114 ResetQuickAllocEntryPoints(&quick_entrypoints_); 115} 116 117void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 118 deoptimization_shadow_frame_ = sf; 119} 120 121void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 122 deoptimization_return_value_.SetJ(ret_val.GetJ()); 123} 124 125ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 126 ShadowFrame* sf = deoptimization_shadow_frame_; 127 deoptimization_shadow_frame_ = NULL; 128 ret_val->SetJ(deoptimization_return_value_.GetJ()); 129 return sf; 130} 131 132void Thread::InitTid() { 133 tid_ = ::art::GetTid(); 134} 135 136void Thread::InitAfterFork() { 137 // One thread (us) survived the fork, but we have a new tid so we need to 138 // update the value stashed in this Thread*. 139 InitTid(); 140} 141 142void* Thread::CreateCallback(void* arg) { 143 Thread* self = reinterpret_cast<Thread*>(arg); 144 Runtime* runtime = Runtime::Current(); 145 if (runtime == NULL) { 146 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 147 return NULL; 148 } 149 { 150 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 151 // after self->Init(). 152 MutexLock mu(NULL, *Locks::runtime_shutdown_lock_); 153 // Check that if we got here we cannot be shutting down (as shutdown should never have started 154 // while threads are being born). 155 CHECK(!runtime->IsShuttingDownLocked()); 156 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 157 Runtime::Current()->EndThreadBirth(); 158 } 159 { 160 ScopedObjectAccess soa(self); 161 162 // Copy peer into self, deleting global reference when done. 163 CHECK(self->jpeer_ != NULL); 164 self->opeer_ = soa.Decode<mirror::Object*>(self->jpeer_); 165 self->GetJniEnv()->DeleteGlobalRef(self->jpeer_); 166 self->jpeer_ = NULL; 167 168 { 169 SirtRef<mirror::String> thread_name(self, self->GetThreadName(soa)); 170 self->SetThreadName(thread_name->ToModifiedUtf8().c_str()); 171 } 172 Dbg::PostThreadStart(self); 173 174 // Invoke the 'run' method of our java.lang.Thread. 175 mirror::Object* receiver = self->opeer_; 176 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 177 mirror::ArtMethod* m = 178 receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(soa.DecodeMethod(mid)); 179 JValue result; 180 ArgArray arg_array(NULL, 0); 181 arg_array.Append(reinterpret_cast<uint32_t>(receiver)); 182 m->Invoke(self, arg_array.GetArray(), arg_array.GetNumBytes(), &result, 'V'); 183 } 184 // Detach and delete self. 185 Runtime::Current()->GetThreadList()->Unregister(self); 186 187 return NULL; 188} 189 190Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, 191 mirror::Object* thread_peer) { 192 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 193 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetInt(thread_peer))); 194 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 195 // to stop it from going away. 196 if (kIsDebugBuild) { 197 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 198 if (result != NULL && !result->IsSuspended()) { 199 Locks::thread_list_lock_->AssertHeld(soa.Self()); 200 } 201 } 202 return result; 203} 204 205Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, jobject java_thread) { 206 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 207} 208 209static size_t FixStackSize(size_t stack_size) { 210 // A stack size of zero means "use the default". 211 if (stack_size == 0) { 212 stack_size = Runtime::Current()->GetDefaultStackSize(); 213 } 214 215 // Dalvik used the bionic pthread default stack size for native threads, 216 // so include that here to support apps that expect large native stacks. 217 stack_size += 1 * MB; 218 219 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 220 if (stack_size < PTHREAD_STACK_MIN) { 221 stack_size = PTHREAD_STACK_MIN; 222 } 223 224 // It's likely that callers are trying to ensure they have at least a certain amount of 225 // stack space, so we should add our reserved space on top of what they requested, rather 226 // than implicitly take it away from them. 227 stack_size += Thread::kStackOverflowReservedBytes; 228 229 // Some systems require the stack size to be a multiple of the system page size, so round up. 230 stack_size = RoundUp(stack_size, kPageSize); 231 232 return stack_size; 233} 234 235void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 236 CHECK(java_peer != NULL); 237 Thread* self = static_cast<JNIEnvExt*>(env)->self; 238 Runtime* runtime = Runtime::Current(); 239 240 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 241 bool thread_start_during_shutdown = false; 242 { 243 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 244 if (runtime->IsShuttingDownLocked()) { 245 thread_start_during_shutdown = true; 246 } else { 247 runtime->StartThreadBirth(); 248 } 249 } 250 if (thread_start_during_shutdown) { 251 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 252 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 253 return; 254 } 255 256 Thread* child_thread = new Thread(is_daemon); 257 // Use global JNI ref to hold peer live while child thread starts. 258 child_thread->jpeer_ = env->NewGlobalRef(java_peer); 259 stack_size = FixStackSize(stack_size); 260 261 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 262 // assign it. 263 env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 264 reinterpret_cast<jint>(child_thread)); 265 266 pthread_t new_pthread; 267 pthread_attr_t attr; 268 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 269 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 270 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 271 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 272 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 273 274 if (pthread_create_result != 0) { 275 // pthread_create(3) failed, so clean up. 276 { 277 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 278 runtime->EndThreadBirth(); 279 } 280 // Manually delete the global reference since Thread::Init will not have been run. 281 env->DeleteGlobalRef(child_thread->jpeer_); 282 child_thread->jpeer_ = NULL; 283 delete child_thread; 284 child_thread = NULL; 285 // TODO: remove from thread group? 286 env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 287 { 288 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 289 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 290 ScopedObjectAccess soa(env); 291 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 292 } 293 } 294} 295 296void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 297 // This function does all the initialization that must be run by the native thread it applies to. 298 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 299 // we can handshake with the corresponding native thread when it's ready.) Check this native 300 // thread hasn't been through here already... 301 CHECK(Thread::Current() == NULL); 302 SetUpAlternateSignalStack(); 303 InitCpu(); 304 InitTlsEntryPoints(); 305 InitCardTable(); 306 InitTid(); 307 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 308 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 309 pthread_self_ = pthread_self(); 310 CHECK(is_started_); 311 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 312 DCHECK_EQ(Thread::Current(), this); 313 314 thin_lock_thread_id_ = thread_list->AllocThreadId(this); 315 InitStackHwm(); 316 317 jni_env_ = new JNIEnvExt(this, java_vm); 318 thread_list->Register(this); 319} 320 321Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 322 bool create_peer) { 323 Thread* self; 324 Runtime* runtime = Runtime::Current(); 325 if (runtime == NULL) { 326 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 327 return NULL; 328 } 329 { 330 MutexLock mu(NULL, *Locks::runtime_shutdown_lock_); 331 if (runtime->IsShuttingDownLocked()) { 332 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 333 return NULL; 334 } else { 335 Runtime::Current()->StartThreadBirth(); 336 self = new Thread(as_daemon); 337 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 338 Runtime::Current()->EndThreadBirth(); 339 } 340 } 341 342 CHECK_NE(self->GetState(), kRunnable); 343 self->SetState(kNative); 344 345 // If we're the main thread, ClassLinker won't be created until after we're attached, 346 // so that thread needs a two-stage attach. Regular threads don't need this hack. 347 // In the compiler, all threads need this hack, because no-one's going to be getting 348 // a native peer! 349 if (create_peer) { 350 self->CreatePeer(thread_name, as_daemon, thread_group); 351 } else { 352 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 353 if (thread_name != NULL) { 354 self->name_->assign(thread_name); 355 ::art::SetThreadName(thread_name); 356 } 357 } 358 359 return self; 360} 361 362void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 363 Runtime* runtime = Runtime::Current(); 364 CHECK(runtime->IsStarted()); 365 JNIEnv* env = jni_env_; 366 367 if (thread_group == NULL) { 368 thread_group = runtime->GetMainThreadGroup(); 369 } 370 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 371 jint thread_priority = GetNativePriority(); 372 jboolean thread_is_daemon = as_daemon; 373 374 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 375 if (peer.get() == NULL) { 376 CHECK(IsExceptionPending()); 377 return; 378 } 379 { 380 ScopedObjectAccess soa(this); 381 opeer_ = soa.Decode<mirror::Object*>(peer.get()); 382 } 383 env->CallNonvirtualVoidMethod(peer.get(), 384 WellKnownClasses::java_lang_Thread, 385 WellKnownClasses::java_lang_Thread_init, 386 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 387 AssertNoPendingException(); 388 389 Thread* self = this; 390 DCHECK_EQ(self, Thread::Current()); 391 jni_env_->SetIntField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 392 reinterpret_cast<jint>(self)); 393 394 ScopedObjectAccess soa(self); 395 SirtRef<mirror::String> peer_thread_name(soa.Self(), GetThreadName(soa)); 396 if (peer_thread_name.get() == NULL) { 397 // The Thread constructor should have set the Thread.name to a 398 // non-null value. However, because we can run without code 399 // available (in the compiler, in tests), we manually assign the 400 // fields the constructor should have set. 401 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 402 SetBoolean(opeer_, thread_is_daemon); 403 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 404 SetObject(opeer_, soa.Decode<mirror::Object*>(thread_group)); 405 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 406 SetObject(opeer_, soa.Decode<mirror::Object*>(thread_name.get())); 407 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 408 SetInt(opeer_, thread_priority); 409 peer_thread_name.reset(GetThreadName(soa)); 410 } 411 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 412 if (peer_thread_name.get() != NULL) { 413 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 414 } 415} 416 417void Thread::SetThreadName(const char* name) { 418 name_->assign(name); 419 ::art::SetThreadName(name); 420 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 421} 422 423void Thread::InitStackHwm() { 424 void* stack_base; 425 size_t stack_size; 426 GetThreadStack(pthread_self_, &stack_base, &stack_size); 427 428 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 429 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", stack_base, PrettySize(stack_size).c_str()); 430 431 stack_begin_ = reinterpret_cast<byte*>(stack_base); 432 stack_size_ = stack_size; 433 434 if (stack_size_ <= kStackOverflowReservedBytes) { 435 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << stack_size_ << " bytes)"; 436 } 437 438 // TODO: move this into the Linux GetThreadStack implementation. 439#if !defined(__APPLE__) 440 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 441 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 442 // will be broken because we'll die long before we get close to 2GB. 443 bool is_main_thread = (::art::GetTid() == getpid()); 444 if (is_main_thread) { 445 rlimit stack_limit; 446 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 447 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 448 } 449 if (stack_limit.rlim_cur == RLIM_INFINITY) { 450 // Find the default stack size for new threads... 451 pthread_attr_t default_attributes; 452 size_t default_stack_size; 453 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 454 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 455 "default stack size query"); 456 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 457 458 // ...and use that as our limit. 459 size_t old_stack_size = stack_size_; 460 stack_size_ = default_stack_size; 461 stack_begin_ += (old_stack_size - stack_size_); 462 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 463 << " to " << PrettySize(stack_size_) 464 << " with base " << reinterpret_cast<void*>(stack_begin_); 465 } 466 } 467#endif 468 469 // Set stack_end_ to the bottom of the stack saving space of stack overflows 470 ResetDefaultStackEnd(); 471 472 // Sanity check. 473 int stack_variable; 474 CHECK_GT(&stack_variable, reinterpret_cast<void*>(stack_end_)); 475} 476 477void Thread::ShortDump(std::ostream& os) const { 478 os << "Thread["; 479 if (GetThreadId() != 0) { 480 // If we're in kStarting, we won't have a thin lock id or tid yet. 481 os << GetThreadId() 482 << ",tid=" << GetTid() << ','; 483 } 484 os << GetState() 485 << ",Thread*=" << this 486 << ",peer=" << opeer_ 487 << ",\"" << *name_ << "\"" 488 << "]"; 489} 490 491void Thread::Dump(std::ostream& os) const { 492 DumpState(os); 493 DumpStack(os); 494} 495 496mirror::String* Thread::GetThreadName(const ScopedObjectAccessUnchecked& soa) const { 497 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 498 return (opeer_ != NULL) ? reinterpret_cast<mirror::String*>(f->GetObject(opeer_)) : NULL; 499} 500 501void Thread::GetThreadName(std::string& name) const { 502 name.assign(*name_); 503} 504 505uint64_t Thread::GetCpuMicroTime() const { 506#if defined(HAVE_POSIX_CLOCKS) 507 clockid_t cpu_clock_id; 508 pthread_getcpuclockid(pthread_self_, &cpu_clock_id); 509 timespec now; 510 clock_gettime(cpu_clock_id, &now); 511 return static_cast<uint64_t>(now.tv_sec) * 1000000LL + now.tv_nsec / 1000LL; 512#else 513 UNIMPLEMENTED(WARNING); 514 return -1; 515#endif 516} 517 518void Thread::AtomicSetFlag(ThreadFlag flag) { 519 android_atomic_or(flag, &state_and_flags_.as_int); 520} 521 522void Thread::AtomicClearFlag(ThreadFlag flag) { 523 android_atomic_and(-1 ^ flag, &state_and_flags_.as_int); 524} 525 526// Attempt to rectify locks so that we dump thread list with required locks before exiting. 527static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 528 LOG(ERROR) << *thread << " suspend count already zero."; 529 Locks::thread_suspend_count_lock_->Unlock(self); 530 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 531 Locks::mutator_lock_->SharedTryLock(self); 532 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 533 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 534 } 535 } 536 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 537 Locks::thread_list_lock_->TryLock(self); 538 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 539 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 540 } 541 } 542 std::ostringstream ss; 543 Runtime::Current()->GetThreadList()->DumpLocked(ss); 544 LOG(FATAL) << ss.str(); 545} 546 547void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 548 DCHECK(delta == -1 || delta == +1 || delta == -debug_suspend_count_) 549 << delta << " " << debug_suspend_count_ << " " << this; 550 DCHECK_GE(suspend_count_, debug_suspend_count_) << this; 551 Locks::thread_suspend_count_lock_->AssertHeld(self); 552 if (this != self && !IsSuspended()) { 553 Locks::thread_list_lock_->AssertHeld(self); 554 } 555 if (UNLIKELY(delta < 0 && suspend_count_ <= 0)) { 556 UnsafeLogFatalForSuspendCount(self, this); 557 return; 558 } 559 560 suspend_count_ += delta; 561 if (for_debugger) { 562 debug_suspend_count_ += delta; 563 } 564 565 if (suspend_count_ == 0) { 566 AtomicClearFlag(kSuspendRequest); 567 } else { 568 AtomicSetFlag(kSuspendRequest); 569 } 570} 571 572void Thread::RunCheckpointFunction() { 573 CHECK(checkpoint_function_ != NULL); 574 ATRACE_BEGIN("Checkpoint function"); 575 checkpoint_function_->Run(this); 576 ATRACE_END(); 577 checkpoint_function_ = NULL; 578 AtomicClearFlag(kCheckpointRequest); 579} 580 581bool Thread::RequestCheckpoint(Closure* function) { 582 union StateAndFlags old_state_and_flags; 583 old_state_and_flags.as_int = state_and_flags_.as_int; 584 if (old_state_and_flags.as_struct.state != kRunnable) { 585 return false; // Fail, thread is suspended and so can't run a checkpoint. 586 } 587 if ((old_state_and_flags.as_struct.flags & kCheckpointRequest) != 0) { 588 return false; // Fail, already a checkpoint pending. 589 } 590 CHECK(checkpoint_function_ == nullptr); 591 checkpoint_function_ = function; 592 // Checkpoint function installed now install flag bit. 593 // We must be runnable to request a checkpoint. 594 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 595 union StateAndFlags new_state_and_flags; 596 new_state_and_flags.as_int = old_state_and_flags.as_int; 597 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 598 int succeeded = android_atomic_cmpxchg(old_state_and_flags.as_int, new_state_and_flags.as_int, 599 &state_and_flags_.as_int); 600 if (UNLIKELY(succeeded != 0)) { 601 // The thread changed state before the checkpoint was installed. 602 CHECK(checkpoint_function_ == function); 603 checkpoint_function_ = NULL; 604 } 605 return succeeded == 0; 606} 607 608void Thread::FullSuspendCheck() { 609 VLOG(threads) << this << " self-suspending"; 610 ATRACE_BEGIN("Full suspend check"); 611 // Make thread appear suspended to other threads, release mutator_lock_. 612 TransitionFromRunnableToSuspended(kSuspended); 613 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 614 TransitionFromSuspendedToRunnable(); 615 ATRACE_END(); 616 VLOG(threads) << this << " self-reviving"; 617} 618 619void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 620 std::string group_name; 621 int priority; 622 bool is_daemon = false; 623 Thread* self = Thread::Current(); 624 625 if (self != NULL && thread != NULL && thread->opeer_ != NULL) { 626 ScopedObjectAccessUnchecked soa(self); 627 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)->GetInt(thread->opeer_); 628 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)->GetBoolean(thread->opeer_); 629 630 mirror::Object* thread_group = 631 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->opeer_); 632 633 if (thread_group != NULL) { 634 mirror::ArtField* group_name_field = 635 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 636 mirror::String* group_name_string = 637 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 638 group_name = (group_name_string != NULL) ? group_name_string->ToModifiedUtf8() : "<null>"; 639 } 640 } else { 641 priority = GetNativePriority(); 642 } 643 644 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 645 if (scheduler_group_name.empty()) { 646 scheduler_group_name = "default"; 647 } 648 649 if (thread != NULL) { 650 os << '"' << *thread->name_ << '"'; 651 if (is_daemon) { 652 os << " daemon"; 653 } 654 os << " prio=" << priority 655 << " tid=" << thread->GetThreadId() 656 << " " << thread->GetState(); 657 if (thread->IsStillStarting()) { 658 os << " (still starting up)"; 659 } 660 os << "\n"; 661 } else { 662 os << '"' << ::art::GetThreadName(tid) << '"' 663 << " prio=" << priority 664 << " (not attached)\n"; 665 } 666 667 if (thread != NULL) { 668 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 669 os << " | group=\"" << group_name << "\"" 670 << " sCount=" << thread->suspend_count_ 671 << " dsCount=" << thread->debug_suspend_count_ 672 << " obj=" << reinterpret_cast<void*>(thread->opeer_) 673 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 674 } 675 676 os << " | sysTid=" << tid 677 << " nice=" << getpriority(PRIO_PROCESS, tid) 678 << " cgrp=" << scheduler_group_name; 679 if (thread != NULL) { 680 int policy; 681 sched_param sp; 682 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->pthread_self_, &policy, &sp), __FUNCTION__); 683 os << " sched=" << policy << "/" << sp.sched_priority 684 << " handle=" << reinterpret_cast<void*>(thread->pthread_self_); 685 } 686 os << "\n"; 687 688 // Grab the scheduler stats for this thread. 689 std::string scheduler_stats; 690 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 691 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 692 } else { 693 scheduler_stats = "0 0 0"; 694 } 695 696 char native_thread_state = '?'; 697 int utime = 0; 698 int stime = 0; 699 int task_cpu = 0; 700 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 701 702 os << " | state=" << native_thread_state 703 << " schedstat=( " << scheduler_stats << " )" 704 << " utm=" << utime 705 << " stm=" << stime 706 << " core=" << task_cpu 707 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 708 if (thread != NULL) { 709 os << " | stack=" << reinterpret_cast<void*>(thread->stack_begin_) << "-" << reinterpret_cast<void*>(thread->stack_end_) 710 << " stackSize=" << PrettySize(thread->stack_size_) << "\n"; 711 } 712} 713 714void Thread::DumpState(std::ostream& os) const { 715 Thread::DumpState(os, this, GetTid()); 716} 717 718struct StackDumpVisitor : public StackVisitor { 719 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 720 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 721 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 722 last_method(NULL), last_line_number(0), repetition_count(0), frame_count(0) { 723 } 724 725 virtual ~StackDumpVisitor() { 726 if (frame_count == 0) { 727 os << " (no managed stack frames)\n"; 728 } 729 } 730 731 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 732 mirror::ArtMethod* m = GetMethod(); 733 if (m->IsRuntimeMethod()) { 734 return true; 735 } 736 const int kMaxRepetition = 3; 737 mirror::Class* c = m->GetDeclaringClass(); 738 const mirror::DexCache* dex_cache = c->GetDexCache(); 739 int line_number = -1; 740 if (dex_cache != NULL) { // be tolerant of bad input 741 const DexFile& dex_file = *dex_cache->GetDexFile(); 742 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 743 } 744 if (line_number == last_line_number && last_method == m) { 745 repetition_count++; 746 } else { 747 if (repetition_count >= kMaxRepetition) { 748 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 749 } 750 repetition_count = 0; 751 last_line_number = line_number; 752 last_method = m; 753 } 754 if (repetition_count < kMaxRepetition) { 755 os << " at " << PrettyMethod(m, false); 756 if (m->IsNative()) { 757 os << "(Native method)"; 758 } else { 759 mh.ChangeMethod(m); 760 const char* source_file(mh.GetDeclaringClassSourceFile()); 761 os << "(" << (source_file != NULL ? source_file : "unavailable") 762 << ":" << line_number << ")"; 763 } 764 os << "\n"; 765 if (frame_count == 0) { 766 Monitor::DescribeWait(os, thread); 767 } 768 if (can_allocate) { 769 Monitor::VisitLocks(this, DumpLockedObject, &os); 770 } 771 } 772 773 ++frame_count; 774 return true; 775 } 776 777 static void DumpLockedObject(mirror::Object* o, void* context) 778 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 779 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 780 os << " - locked <" << o << "> (a " << PrettyTypeOf(o) << ")\n"; 781 } 782 783 std::ostream& os; 784 const Thread* thread; 785 const bool can_allocate; 786 MethodHelper mh; 787 mirror::ArtMethod* last_method; 788 int last_line_number; 789 int repetition_count; 790 int frame_count; 791}; 792 793static bool ShouldShowNativeStack(const Thread* thread) 794 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 795 ThreadState state = thread->GetState(); 796 797 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 798 if (state > kWaiting && state < kStarting) { 799 return true; 800 } 801 802 // In an Object.wait variant or Thread.sleep? That's not interesting. 803 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 804 return false; 805 } 806 807 // In some other native method? That's interesting. 808 // We don't just check kNative because native methods will be in state kSuspended if they're 809 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 810 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 811 mirror::ArtMethod* current_method = thread->GetCurrentMethod(NULL); 812 return current_method != NULL && current_method->IsNative(); 813} 814 815void Thread::DumpStack(std::ostream& os) const { 816 // TODO: we call this code when dying but may not have suspended the thread ourself. The 817 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 818 // the race with the thread_suspend_count_lock_). 819 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 820 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 821 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 822 // If we're currently in native code, dump that stack before dumping the managed stack. 823 if (dump_for_abort || ShouldShowNativeStack(this)) { 824 DumpKernelStack(os, GetTid(), " kernel: ", false); 825 DumpNativeStack(os, GetTid(), " native: ", false); 826 } 827 UniquePtr<Context> context(Context::Create()); 828 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), !throwing_OutOfMemoryError_); 829 dumper.WalkStack(); 830 } else { 831 os << "Not able to dump stack of thread that isn't suspended"; 832 } 833} 834 835void Thread::ThreadExitCallback(void* arg) { 836 Thread* self = reinterpret_cast<Thread*>(arg); 837 if (self->thread_exit_check_count_ == 0) { 838 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's going to use a pthread_key_create destructor?): " << *self; 839 CHECK(is_started_); 840 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 841 self->thread_exit_check_count_ = 1; 842 } else { 843 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 844 } 845} 846 847void Thread::Startup() { 848 CHECK(!is_started_); 849 is_started_ = true; 850 { 851 // MutexLock to keep annotalysis happy. 852 // 853 // Note we use NULL for the thread because Thread::Current can 854 // return garbage since (is_started_ == true) and 855 // Thread::pthread_key_self_ is not yet initialized. 856 // This was seen on glibc. 857 MutexLock mu(NULL, *Locks::thread_suspend_count_lock_); 858 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 859 *Locks::thread_suspend_count_lock_); 860 } 861 862 // Allocate a TLS slot. 863 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 864 865 // Double-check the TLS slot allocation. 866 if (pthread_getspecific(pthread_key_self_) != NULL) { 867 LOG(FATAL) << "Newly-created pthread TLS slot is not NULL"; 868 } 869} 870 871void Thread::FinishStartup() { 872 Runtime* runtime = Runtime::Current(); 873 CHECK(runtime->IsStarted()); 874 875 // Finish attaching the main thread. 876 ScopedObjectAccess soa(Thread::Current()); 877 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 878 879 Runtime::Current()->GetClassLinker()->RunRootClinits(); 880} 881 882void Thread::Shutdown() { 883 CHECK(is_started_); 884 is_started_ = false; 885 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 886 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 887 if (resume_cond_ != NULL) { 888 delete resume_cond_; 889 resume_cond_ = NULL; 890 } 891} 892 893Thread::Thread(bool daemon) 894 : suspend_count_(0), 895 card_table_(NULL), 896 exception_(NULL), 897 stack_end_(NULL), 898 managed_stack_(), 899 jni_env_(NULL), 900 self_(NULL), 901 opeer_(NULL), 902 jpeer_(NULL), 903 stack_begin_(NULL), 904 stack_size_(0), 905 thin_lock_thread_id_(0), 906 stack_trace_sample_(NULL), 907 trace_clock_base_(0), 908 tid_(0), 909 wait_mutex_(new Mutex("a thread wait mutex")), 910 wait_cond_(new ConditionVariable("a thread wait condition variable", *wait_mutex_)), 911 wait_monitor_(NULL), 912 interrupted_(false), 913 wait_next_(NULL), 914 monitor_enter_object_(NULL), 915 top_sirt_(NULL), 916 runtime_(NULL), 917 class_loader_override_(NULL), 918 long_jump_context_(NULL), 919 throwing_OutOfMemoryError_(false), 920 debug_suspend_count_(0), 921 debug_invoke_req_(new DebugInvokeReq), 922 single_step_control_(new SingleStepControl), 923 deoptimization_shadow_frame_(NULL), 924 instrumentation_stack_(new std::deque<instrumentation::InstrumentationStackFrame>), 925 name_(new std::string(kThreadNameDuringStartup)), 926 daemon_(daemon), 927 pthread_self_(0), 928 no_thread_suspension_(0), 929 last_no_thread_suspension_cause_(NULL), 930 checkpoint_function_(0), 931 thread_exit_check_count_(0) { 932 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 933 state_and_flags_.as_struct.flags = 0; 934 state_and_flags_.as_struct.state = kNative; 935 memset(&held_mutexes_[0], 0, sizeof(held_mutexes_)); 936 memset(rosalloc_runs_, 0, sizeof(rosalloc_runs_)); 937} 938 939bool Thread::IsStillStarting() const { 940 // You might think you can check whether the state is kStarting, but for much of thread startup, 941 // the thread is in kNative; it might also be in kVmWait. 942 // You might think you can check whether the peer is NULL, but the peer is actually created and 943 // assigned fairly early on, and needs to be. 944 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 945 // this thread _ever_ entered kRunnable". 946 return (jpeer_ == NULL && opeer_ == NULL) || (*name_ == kThreadNameDuringStartup); 947} 948 949void Thread::AssertNoPendingException() const { 950 if (UNLIKELY(IsExceptionPending())) { 951 ScopedObjectAccess soa(Thread::Current()); 952 mirror::Throwable* exception = GetException(NULL); 953 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 954 } 955} 956 957static mirror::Object* MonitorExitVisitor(mirror::Object* object, void* arg) 958 NO_THREAD_SAFETY_ANALYSIS { 959 Thread* self = reinterpret_cast<Thread*>(arg); 960 mirror::Object* entered_monitor = object; 961 if (self->HoldsLock(entered_monitor)) { 962 LOG(WARNING) << "Calling MonitorExit on object " 963 << object << " (" << PrettyTypeOf(object) << ")" 964 << " left locked by native thread " 965 << *Thread::Current() << " which is detaching"; 966 entered_monitor->MonitorExit(self); 967 } 968 return object; 969} 970 971void Thread::Destroy() { 972 Thread* self = this; 973 DCHECK_EQ(self, Thread::Current()); 974 975 if (opeer_ != NULL) { 976 ScopedObjectAccess soa(self); 977 // We may need to call user-supplied managed code, do this before final clean-up. 978 HandleUncaughtExceptions(soa); 979 RemoveFromThreadGroup(soa); 980 981 // this.nativePeer = 0; 982 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetInt(opeer_, 0); 983 Dbg::PostThreadDeath(self); 984 985 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 986 // who is waiting. 987 mirror::Object* lock = 988 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 989 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 990 if (lock != NULL) { 991 ObjectLock locker(self, lock); 992 locker.Notify(); 993 } 994 } 995 996 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 997 if (jni_env_ != NULL) { 998 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self); 999 } 1000} 1001 1002Thread::~Thread() { 1003 if (jni_env_ != NULL && jpeer_ != NULL) { 1004 // If pthread_create fails we don't have a jni env here. 1005 jni_env_->DeleteGlobalRef(jpeer_); 1006 jpeer_ = NULL; 1007 } 1008 opeer_ = NULL; 1009 1010 delete jni_env_; 1011 jni_env_ = NULL; 1012 1013 CHECK_NE(GetState(), kRunnable); 1014 // We may be deleting a still born thread. 1015 SetStateUnsafe(kTerminated); 1016 1017 delete wait_cond_; 1018 delete wait_mutex_; 1019 1020 if (long_jump_context_ != NULL) { 1021 delete long_jump_context_; 1022 } 1023 1024 delete debug_invoke_req_; 1025 delete single_step_control_; 1026 delete instrumentation_stack_; 1027 delete name_; 1028 delete stack_trace_sample_; 1029 1030 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1031 1032 TearDownAlternateSignalStack(); 1033} 1034 1035void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1036 if (!IsExceptionPending()) { 1037 return; 1038 } 1039 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1040 ScopedThreadStateChange tsc(this, kNative); 1041 1042 // Get and clear the exception. 1043 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1044 jni_env_->ExceptionClear(); 1045 1046 // If the thread has its own handler, use that. 1047 ScopedLocalRef<jobject> handler(jni_env_, 1048 jni_env_->GetObjectField(peer.get(), 1049 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1050 if (handler.get() == NULL) { 1051 // Otherwise use the thread group's default handler. 1052 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1053 } 1054 1055 // Call the handler. 1056 jni_env_->CallVoidMethod(handler.get(), 1057 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1058 peer.get(), exception.get()); 1059 1060 // If the handler threw, clear that exception too. 1061 jni_env_->ExceptionClear(); 1062} 1063 1064void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1065 // this.group.removeThread(this); 1066 // group can be null if we're in the compiler or a test. 1067 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1068 if (ogroup != NULL) { 1069 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1070 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1071 ScopedThreadStateChange tsc(soa.Self(), kNative); 1072 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1073 peer.get()); 1074 } 1075} 1076 1077size_t Thread::NumSirtReferences() { 1078 size_t count = 0; 1079 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1080 count += cur->NumberOfReferences(); 1081 } 1082 return count; 1083} 1084 1085bool Thread::SirtContains(jobject obj) const { 1086 mirror::Object** sirt_entry = reinterpret_cast<mirror::Object**>(obj); 1087 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1088 if (cur->Contains(sirt_entry)) { 1089 return true; 1090 } 1091 } 1092 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1093 return managed_stack_.ShadowFramesContain(sirt_entry); 1094} 1095 1096void Thread::SirtVisitRoots(RootVisitor* visitor, void* arg) { 1097 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1098 size_t num_refs = cur->NumberOfReferences(); 1099 for (size_t j = 0; j < num_refs; j++) { 1100 mirror::Object* object = cur->GetReference(j); 1101 if (object != nullptr) { 1102 const mirror::Object* new_obj = visitor(object, arg); 1103 DCHECK(new_obj != nullptr); 1104 if (new_obj != object) { 1105 cur->SetReference(j, const_cast<mirror::Object*>(new_obj)); 1106 } 1107 } 1108 } 1109 } 1110} 1111 1112mirror::Object* Thread::DecodeJObject(jobject obj) const { 1113 Locks::mutator_lock_->AssertSharedHeld(this); 1114 if (obj == NULL) { 1115 return NULL; 1116 } 1117 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1118 IndirectRefKind kind = GetIndirectRefKind(ref); 1119 mirror::Object* result; 1120 // The "kinds" below are sorted by the frequency we expect to encounter them. 1121 if (kind == kLocal) { 1122 IndirectReferenceTable& locals = jni_env_->locals; 1123 result = const_cast<mirror::Object*>(locals.Get(ref)); 1124 } else if (kind == kSirtOrInvalid) { 1125 // TODO: make stack indirect reference table lookup more efficient 1126 // Check if this is a local reference in the SIRT 1127 if (LIKELY(SirtContains(obj))) { 1128 result = *reinterpret_cast<mirror::Object**>(obj); // Read from SIRT 1129 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1130 // Assume an invalid local reference is actually a direct pointer. 1131 result = reinterpret_cast<mirror::Object*>(obj); 1132 } else { 1133 result = kInvalidIndirectRefObject; 1134 } 1135 } else if (kind == kGlobal) { 1136 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1137 IndirectReferenceTable& globals = vm->globals; 1138 ReaderMutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1139 result = const_cast<mirror::Object*>(globals.Get(ref)); 1140 } else { 1141 DCHECK_EQ(kind, kWeakGlobal); 1142 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1143 if (result == kClearedJniWeakGlobal) { 1144 // This is a special case where it's okay to return NULL. 1145 return NULL; 1146 } 1147 } 1148 1149 if (UNLIKELY(result == NULL)) { 1150 JniAbortF(NULL, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1151 } else { 1152 if (kIsDebugBuild && (result != kInvalidIndirectRefObject)) { 1153 Runtime::Current()->GetHeap()->VerifyObject(result); 1154 } 1155 } 1156 return result; 1157} 1158 1159// Implements java.lang.Thread.interrupted. 1160bool Thread::Interrupted() { 1161 MutexLock mu(Thread::Current(), *wait_mutex_); 1162 bool interrupted = interrupted_; 1163 interrupted_ = false; 1164 return interrupted; 1165} 1166 1167// Implements java.lang.Thread.isInterrupted. 1168bool Thread::IsInterrupted() { 1169 MutexLock mu(Thread::Current(), *wait_mutex_); 1170 return interrupted_; 1171} 1172 1173void Thread::Interrupt() { 1174 Thread* self = Thread::Current(); 1175 MutexLock mu(self, *wait_mutex_); 1176 if (interrupted_) { 1177 return; 1178 } 1179 interrupted_ = true; 1180 NotifyLocked(self); 1181} 1182 1183void Thread::Notify() { 1184 Thread* self = Thread::Current(); 1185 MutexLock mu(self, *wait_mutex_); 1186 NotifyLocked(self); 1187} 1188 1189void Thread::NotifyLocked(Thread* self) { 1190 if (wait_monitor_ != NULL) { 1191 wait_cond_->Signal(self); 1192 } 1193} 1194 1195class CountStackDepthVisitor : public StackVisitor { 1196 public: 1197 explicit CountStackDepthVisitor(Thread* thread) 1198 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1199 : StackVisitor(thread, NULL), 1200 depth_(0), skip_depth_(0), skipping_(true) {} 1201 1202 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1203 // We want to skip frames up to and including the exception's constructor. 1204 // Note we also skip the frame if it doesn't have a method (namely the callee 1205 // save frame) 1206 mirror::ArtMethod* m = GetMethod(); 1207 if (skipping_ && !m->IsRuntimeMethod() && 1208 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1209 skipping_ = false; 1210 } 1211 if (!skipping_) { 1212 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1213 ++depth_; 1214 } 1215 } else { 1216 ++skip_depth_; 1217 } 1218 return true; 1219 } 1220 1221 int GetDepth() const { 1222 return depth_; 1223 } 1224 1225 int GetSkipDepth() const { 1226 return skip_depth_; 1227 } 1228 1229 private: 1230 uint32_t depth_; 1231 uint32_t skip_depth_; 1232 bool skipping_; 1233}; 1234 1235class BuildInternalStackTraceVisitor : public StackVisitor { 1236 public: 1237 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1238 : StackVisitor(thread, NULL), self_(self), 1239 skip_depth_(skip_depth), count_(0), dex_pc_trace_(NULL), method_trace_(NULL) {} 1240 1241 bool Init(int depth) 1242 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1243 // Allocate method trace with an extra slot that will hold the PC trace 1244 SirtRef<mirror::ObjectArray<mirror::Object> > 1245 method_trace(self_, 1246 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1247 depth + 1)); 1248 if (method_trace.get() == NULL) { 1249 return false; 1250 } 1251 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1252 if (dex_pc_trace == NULL) { 1253 return false; 1254 } 1255 // Save PC trace in last element of method trace, also places it into the 1256 // object graph. 1257 method_trace->Set(depth, dex_pc_trace); 1258 // Set the Object*s and assert that no thread suspension is now possible. 1259 const char* last_no_suspend_cause = 1260 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1261 CHECK(last_no_suspend_cause == NULL) << last_no_suspend_cause; 1262 method_trace_ = method_trace.get(); 1263 dex_pc_trace_ = dex_pc_trace; 1264 return true; 1265 } 1266 1267 virtual ~BuildInternalStackTraceVisitor() { 1268 if (method_trace_ != NULL) { 1269 self_->EndAssertNoThreadSuspension(NULL); 1270 } 1271 } 1272 1273 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1274 if (method_trace_ == NULL || dex_pc_trace_ == NULL) { 1275 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1276 } 1277 if (skip_depth_ > 0) { 1278 skip_depth_--; 1279 return true; 1280 } 1281 mirror::ArtMethod* m = GetMethod(); 1282 if (m->IsRuntimeMethod()) { 1283 return true; // Ignore runtime frames (in particular callee save). 1284 } 1285 method_trace_->Set(count_, m); 1286 dex_pc_trace_->Set(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1287 ++count_; 1288 return true; 1289 } 1290 1291 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1292 return method_trace_; 1293 } 1294 1295 private: 1296 Thread* const self_; 1297 // How many more frames to skip. 1298 int32_t skip_depth_; 1299 // Current position down stack trace. 1300 uint32_t count_; 1301 // Array of dex PC values. 1302 mirror::IntArray* dex_pc_trace_; 1303 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1304 mirror::ObjectArray<mirror::Object>* method_trace_; 1305}; 1306 1307jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1308 // Compute depth of stack 1309 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1310 count_visitor.WalkStack(); 1311 int32_t depth = count_visitor.GetDepth(); 1312 int32_t skip_depth = count_visitor.GetSkipDepth(); 1313 1314 // Build internal stack trace. 1315 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1316 skip_depth); 1317 if (!build_trace_visitor.Init(depth)) { 1318 return NULL; // Allocation failed. 1319 } 1320 build_trace_visitor.WalkStack(); 1321 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1322 if (kIsDebugBuild) { 1323 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1324 CHECK(trace->Get(i) != NULL); 1325 } 1326 } 1327 return soa.AddLocalReference<jobjectArray>(trace); 1328} 1329 1330jobjectArray Thread::InternalStackTraceToStackTraceElementArray(JNIEnv* env, jobject internal, 1331 jobjectArray output_array, int* stack_depth) { 1332 // Transition into runnable state to work on Object*/Array* 1333 ScopedObjectAccess soa(env); 1334 // Decode the internal stack trace into the depth, method trace and PC trace 1335 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1336 1337 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1338 1339 jobjectArray result; 1340 1341 if (output_array != NULL) { 1342 // Reuse the array we were given. 1343 result = output_array; 1344 // ...adjusting the number of frames we'll write to not exceed the array length. 1345 const int32_t traces_length = 1346 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1347 depth = std::min(depth, traces_length); 1348 } else { 1349 // Create java_trace array and place in local reference table 1350 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1351 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1352 if (java_traces == NULL) { 1353 return NULL; 1354 } 1355 result = soa.AddLocalReference<jobjectArray>(java_traces); 1356 } 1357 1358 if (stack_depth != NULL) { 1359 *stack_depth = depth; 1360 } 1361 1362 for (int32_t i = 0; i < depth; ++i) { 1363 mirror::ObjectArray<mirror::Object>* method_trace = 1364 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1365 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1366 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1367 MethodHelper mh(method); 1368 int32_t line_number; 1369 SirtRef<mirror::String> class_name_object(soa.Self(), NULL); 1370 SirtRef<mirror::String> source_name_object(soa.Self(), NULL); 1371 if (method->IsProxyMethod()) { 1372 line_number = -1; 1373 class_name_object.reset(method->GetDeclaringClass()->GetName()); 1374 // source_name_object intentionally left null for proxy methods 1375 } else { 1376 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1377 uint32_t dex_pc = pc_trace->Get(i); 1378 line_number = mh.GetLineNumFromDexPC(dex_pc); 1379 // Allocate element, potentially triggering GC 1380 // TODO: reuse class_name_object via Class::name_? 1381 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1382 CHECK(descriptor != NULL); 1383 std::string class_name(PrettyDescriptor(descriptor)); 1384 class_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1385 if (class_name_object.get() == NULL) { 1386 return NULL; 1387 } 1388 const char* source_file = mh.GetDeclaringClassSourceFile(); 1389 source_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1390 if (source_name_object.get() == NULL) { 1391 return NULL; 1392 } 1393 } 1394 const char* method_name = mh.GetName(); 1395 CHECK(method_name != NULL); 1396 SirtRef<mirror::String> method_name_object(soa.Self(), 1397 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1398 method_name)); 1399 if (method_name_object.get() == NULL) { 1400 return NULL; 1401 } 1402 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1403 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1404 if (obj == NULL) { 1405 return NULL; 1406 } 1407 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set(i, obj); 1408 } 1409 return result; 1410} 1411 1412void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1413 const char* exception_class_descriptor, const char* fmt, ...) { 1414 va_list args; 1415 va_start(args, fmt); 1416 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1417 fmt, args); 1418 va_end(args); 1419} 1420 1421void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1422 const char* exception_class_descriptor, 1423 const char* fmt, va_list ap) { 1424 std::string msg; 1425 StringAppendV(&msg, fmt, ap); 1426 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1427} 1428 1429void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1430 const char* msg) { 1431 AssertNoPendingException(); // Callers should either clear or call ThrowNewWrappedException. 1432 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1433} 1434 1435void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1436 const char* exception_class_descriptor, 1437 const char* msg) { 1438 DCHECK_EQ(this, Thread::Current()); 1439 // Ensure we don't forget arguments over object allocation. 1440 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1441 SirtRef<mirror::ArtMethod> saved_throw_method(this, throw_location.GetMethod()); 1442 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1443 SirtRef<mirror::Throwable> cause(this, GetException(NULL)); 1444 ClearException(); 1445 Runtime* runtime = Runtime::Current(); 1446 1447 mirror::ClassLoader* cl = NULL; 1448 if (throw_location.GetMethod() != NULL) { 1449 cl = throw_location.GetMethod()->GetDeclaringClass()->GetClassLoader(); 1450 } 1451 SirtRef<mirror::ClassLoader> class_loader(this, cl); 1452 SirtRef<mirror::Class> 1453 exception_class(this, runtime->GetClassLinker()->FindClass(exception_class_descriptor, 1454 class_loader)); 1455 if (UNLIKELY(exception_class.get() == NULL)) { 1456 CHECK(IsExceptionPending()); 1457 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1458 return; 1459 } 1460 1461 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class.get(), true, true))) { 1462 DCHECK(IsExceptionPending()); 1463 return; 1464 } 1465 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1466 SirtRef<mirror::Throwable> exception(this, 1467 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1468 1469 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1470 if (exception.get() == nullptr) { 1471 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1472 return; 1473 } 1474 1475 // Choose an appropriate constructor and set up the arguments. 1476 const char* signature; 1477 SirtRef<mirror::String> msg_string(this, NULL); 1478 if (msg != NULL) { 1479 // Ensure we remember this and the method over the String allocation. 1480 msg_string.reset(mirror::String::AllocFromModifiedUtf8(this, msg)); 1481 if (UNLIKELY(msg_string.get() == NULL)) { 1482 CHECK(IsExceptionPending()); // OOME. 1483 return; 1484 } 1485 if (cause.get() == NULL) { 1486 signature = "(Ljava/lang/String;)V"; 1487 } else { 1488 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1489 } 1490 } else { 1491 if (cause.get() == NULL) { 1492 signature = "()V"; 1493 } else { 1494 signature = "(Ljava/lang/Throwable;)V"; 1495 } 1496 } 1497 mirror::ArtMethod* exception_init_method = 1498 exception_class->FindDeclaredDirectMethod("<init>", signature); 1499 1500 CHECK(exception_init_method != NULL) << "No <init>" << signature << " in " 1501 << PrettyDescriptor(exception_class_descriptor); 1502 1503 if (UNLIKELY(!runtime->IsStarted())) { 1504 // Something is trying to throw an exception without a started runtime, which is the common 1505 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1506 // the exception fields directly. 1507 if (msg != NULL) { 1508 exception->SetDetailMessage(msg_string.get()); 1509 } 1510 if (cause.get() != NULL) { 1511 exception->SetCause(cause.get()); 1512 } 1513 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1514 throw_location.GetDexPc()); 1515 SetException(gc_safe_throw_location, exception.get()); 1516 } else { 1517 ArgArray args("VLL", 3); 1518 args.Append(reinterpret_cast<uint32_t>(exception.get())); 1519 if (msg != NULL) { 1520 args.Append(reinterpret_cast<uint32_t>(msg_string.get())); 1521 } 1522 if (cause.get() != NULL) { 1523 args.Append(reinterpret_cast<uint32_t>(cause.get())); 1524 } 1525 JValue result; 1526 exception_init_method->Invoke(this, args.GetArray(), args.GetNumBytes(), &result, 'V'); 1527 if (LIKELY(!IsExceptionPending())) { 1528 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1529 throw_location.GetDexPc()); 1530 SetException(gc_safe_throw_location, exception.get()); 1531 } 1532 } 1533} 1534 1535void Thread::ThrowOutOfMemoryError(const char* msg) { 1536 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1537 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1538 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1539 if (!throwing_OutOfMemoryError_) { 1540 throwing_OutOfMemoryError_ = true; 1541 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1542 throwing_OutOfMemoryError_ = false; 1543 } else { 1544 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1545 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1546 } 1547} 1548 1549Thread* Thread::CurrentFromGdb() { 1550 return Thread::Current(); 1551} 1552 1553void Thread::DumpFromGdb() const { 1554 std::ostringstream ss; 1555 Dump(ss); 1556 std::string str(ss.str()); 1557 // log to stderr for debugging command line processes 1558 std::cerr << str; 1559#ifdef HAVE_ANDROID_OS 1560 // log to logcat for debugging frameworks processes 1561 LOG(INFO) << str; 1562#endif 1563} 1564 1565struct EntryPointInfo { 1566 uint32_t offset; 1567 const char* name; 1568}; 1569#define INTERPRETER_ENTRY_POINT_INFO(x) { INTERPRETER_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1570#define JNI_ENTRY_POINT_INFO(x) { JNI_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1571#define PORTABLE_ENTRY_POINT_INFO(x) { PORTABLE_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1572#define QUICK_ENTRY_POINT_INFO(x) { QUICK_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1573static const EntryPointInfo gThreadEntryPointInfo[] = { 1574 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge), 1575 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge), 1576 JNI_ENTRY_POINT_INFO(pDlsymLookup), 1577 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline), 1578 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline), 1579 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge), 1580 QUICK_ENTRY_POINT_INFO(pAllocArray), 1581 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck), 1582 QUICK_ENTRY_POINT_INFO(pAllocObject), 1583 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck), 1584 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray), 1585 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck), 1586 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial), 1587 QUICK_ENTRY_POINT_INFO(pCheckCast), 1588 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage), 1589 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess), 1590 QUICK_ENTRY_POINT_INFO(pInitializeType), 1591 QUICK_ENTRY_POINT_INFO(pResolveString), 1592 QUICK_ENTRY_POINT_INFO(pSet32Instance), 1593 QUICK_ENTRY_POINT_INFO(pSet32Static), 1594 QUICK_ENTRY_POINT_INFO(pSet64Instance), 1595 QUICK_ENTRY_POINT_INFO(pSet64Static), 1596 QUICK_ENTRY_POINT_INFO(pSetObjInstance), 1597 QUICK_ENTRY_POINT_INFO(pSetObjStatic), 1598 QUICK_ENTRY_POINT_INFO(pGet32Instance), 1599 QUICK_ENTRY_POINT_INFO(pGet32Static), 1600 QUICK_ENTRY_POINT_INFO(pGet64Instance), 1601 QUICK_ENTRY_POINT_INFO(pGet64Static), 1602 QUICK_ENTRY_POINT_INFO(pGetObjInstance), 1603 QUICK_ENTRY_POINT_INFO(pGetObjStatic), 1604 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck), 1605 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck), 1606 QUICK_ENTRY_POINT_INFO(pAputObject), 1607 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData), 1608 QUICK_ENTRY_POINT_INFO(pJniMethodStart), 1609 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1610 QUICK_ENTRY_POINT_INFO(pJniMethodEnd), 1611 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1612 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference), 1613 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1614 QUICK_ENTRY_POINT_INFO(pLockObject), 1615 QUICK_ENTRY_POINT_INFO(pUnlockObject), 1616 QUICK_ENTRY_POINT_INFO(pCmpgDouble), 1617 QUICK_ENTRY_POINT_INFO(pCmpgFloat), 1618 QUICK_ENTRY_POINT_INFO(pCmplDouble), 1619 QUICK_ENTRY_POINT_INFO(pCmplFloat), 1620 QUICK_ENTRY_POINT_INFO(pFmod), 1621 QUICK_ENTRY_POINT_INFO(pSqrt), 1622 QUICK_ENTRY_POINT_INFO(pL2d), 1623 QUICK_ENTRY_POINT_INFO(pFmodf), 1624 QUICK_ENTRY_POINT_INFO(pL2f), 1625 QUICK_ENTRY_POINT_INFO(pD2iz), 1626 QUICK_ENTRY_POINT_INFO(pF2iz), 1627 QUICK_ENTRY_POINT_INFO(pIdivmod), 1628 QUICK_ENTRY_POINT_INFO(pD2l), 1629 QUICK_ENTRY_POINT_INFO(pF2l), 1630 QUICK_ENTRY_POINT_INFO(pLdiv), 1631 QUICK_ENTRY_POINT_INFO(pLmod), 1632 QUICK_ENTRY_POINT_INFO(pLmul), 1633 QUICK_ENTRY_POINT_INFO(pShlLong), 1634 QUICK_ENTRY_POINT_INFO(pShrLong), 1635 QUICK_ENTRY_POINT_INFO(pUshrLong), 1636 QUICK_ENTRY_POINT_INFO(pIndexOf), 1637 QUICK_ENTRY_POINT_INFO(pMemcmp16), 1638 QUICK_ENTRY_POINT_INFO(pStringCompareTo), 1639 QUICK_ENTRY_POINT_INFO(pMemcpy), 1640 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline), 1641 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline), 1642 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge), 1643 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1644 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1645 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1646 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1647 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1648 QUICK_ENTRY_POINT_INFO(pCheckSuspend), 1649 QUICK_ENTRY_POINT_INFO(pTestSuspend), 1650 QUICK_ENTRY_POINT_INFO(pDeliverException), 1651 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds), 1652 QUICK_ENTRY_POINT_INFO(pThrowDivZero), 1653 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod), 1654 QUICK_ENTRY_POINT_INFO(pThrowNullPointer), 1655 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow), 1656}; 1657#undef QUICK_ENTRY_POINT_INFO 1658 1659void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1660 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1661 1662#define DO_THREAD_OFFSET(x) \ 1663 if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { \ 1664 os << # x; \ 1665 return; \ 1666 } 1667 DO_THREAD_OFFSET(state_and_flags_); 1668 DO_THREAD_OFFSET(card_table_); 1669 DO_THREAD_OFFSET(exception_); 1670 DO_THREAD_OFFSET(opeer_); 1671 DO_THREAD_OFFSET(jni_env_); 1672 DO_THREAD_OFFSET(self_); 1673 DO_THREAD_OFFSET(stack_end_); 1674 DO_THREAD_OFFSET(suspend_count_); 1675 DO_THREAD_OFFSET(thin_lock_thread_id_); 1676 // DO_THREAD_OFFSET(top_of_managed_stack_); 1677 // DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1678 DO_THREAD_OFFSET(top_sirt_); 1679#undef DO_THREAD_OFFSET 1680 1681 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1682 CHECK_EQ(entry_point_count * size_of_pointers, 1683 sizeof(InterpreterEntryPoints) + sizeof(JniEntryPoints) + sizeof(PortableEntryPoints) + 1684 sizeof(QuickEntryPoints)); 1685 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, interpreter_entrypoints_); 1686 for (size_t i = 0; i < entry_point_count; ++i) { 1687 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1688 expected_offset += size_of_pointers; 1689 if (gThreadEntryPointInfo[i].offset == offset) { 1690 os << gThreadEntryPointInfo[i].name; 1691 return; 1692 } 1693 } 1694 os << offset; 1695} 1696 1697static const bool kDebugExceptionDelivery = false; 1698class CatchBlockStackVisitor : public StackVisitor { 1699 public: 1700 CatchBlockStackVisitor(Thread* self, const ThrowLocation& throw_location, 1701 mirror::Throwable* exception, bool is_deoptimization) 1702 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1703 : StackVisitor(self, self->GetLongJumpContext()), 1704 self_(self), exception_(exception), is_deoptimization_(is_deoptimization), 1705 to_find_(is_deoptimization ? NULL : exception->GetClass()), throw_location_(throw_location), 1706 handler_quick_frame_(NULL), handler_quick_frame_pc_(0), handler_dex_pc_(0), 1707 native_method_count_(0), clear_exception_(false), 1708 method_tracing_active_(is_deoptimization || 1709 Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()), 1710 instrumentation_frames_to_pop_(0), top_shadow_frame_(NULL), prev_shadow_frame_(NULL) { 1711 // Exception not in root sets, can't allow GC. 1712 last_no_assert_suspension_cause_ = self->StartAssertNoThreadSuspension("Finding catch block"); 1713 } 1714 1715 ~CatchBlockStackVisitor() { 1716 LOG(FATAL) << "UNREACHABLE"; // Expected to take long jump. 1717 } 1718 1719 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1720 mirror::ArtMethod* method = GetMethod(); 1721 if (method == NULL) { 1722 // This is the upcall, we remember the frame and last pc so that we may long jump to them. 1723 handler_quick_frame_pc_ = GetCurrentQuickFramePc(); 1724 handler_quick_frame_ = GetCurrentQuickFrame(); 1725 return false; // End stack walk. 1726 } else { 1727 if (UNLIKELY(method_tracing_active_ && 1728 GetQuickInstrumentationExitPc() == GetReturnPc())) { 1729 // Keep count of the number of unwinds during instrumentation. 1730 instrumentation_frames_to_pop_++; 1731 } 1732 if (method->IsRuntimeMethod()) { 1733 // Ignore callee save method. 1734 DCHECK(method->IsCalleeSaveMethod()); 1735 return true; 1736 } else if (is_deoptimization_) { 1737 return HandleDeoptimization(method); 1738 } else { 1739 return HandleTryItems(method); 1740 } 1741 } 1742 } 1743 1744 bool HandleTryItems(mirror::ArtMethod* method) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1745 uint32_t dex_pc = DexFile::kDexNoIndex; 1746 if (method->IsNative()) { 1747 native_method_count_++; 1748 } else { 1749 dex_pc = GetDexPc(); 1750 } 1751 if (dex_pc != DexFile::kDexNoIndex) { 1752 uint32_t found_dex_pc = method->FindCatchBlock(to_find_, dex_pc, &clear_exception_); 1753 if (found_dex_pc != DexFile::kDexNoIndex) { 1754 handler_dex_pc_ = found_dex_pc; 1755 handler_quick_frame_pc_ = method->ToNativePc(found_dex_pc); 1756 handler_quick_frame_ = GetCurrentQuickFrame(); 1757 return false; // End stack walk. 1758 } 1759 } 1760 return true; // Continue stack walk. 1761 } 1762 1763 bool HandleDeoptimization(mirror::ArtMethod* m) 1764 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1765 MethodHelper mh(m); 1766 const DexFile::CodeItem* code_item = mh.GetCodeItem(); 1767 CHECK(code_item != NULL); 1768 uint16_t num_regs = code_item->registers_size_; 1769 uint32_t dex_pc = GetDexPc(); 1770 const Instruction* inst = Instruction::At(code_item->insns_ + dex_pc); 1771 uint32_t new_dex_pc = dex_pc + inst->SizeInCodeUnits(); 1772 ShadowFrame* new_frame = ShadowFrame::Create(num_regs, NULL, m, new_dex_pc); 1773 SirtRef<mirror::DexCache> dex_cache(self_, mh.GetDexCache()); 1774 SirtRef<mirror::ClassLoader> class_loader(self_, mh.GetClassLoader()); 1775 verifier::MethodVerifier verifier(&mh.GetDexFile(), &dex_cache, &class_loader, 1776 &mh.GetClassDef(), code_item, m->GetDexMethodIndex(), m, 1777 m->GetAccessFlags(), false, true); 1778 verifier.Verify(); 1779 std::vector<int32_t> kinds = verifier.DescribeVRegs(dex_pc); 1780 for (uint16_t reg = 0; reg < num_regs; reg++) { 1781 VRegKind kind = static_cast<VRegKind>(kinds.at(reg * 2)); 1782 switch (kind) { 1783 case kUndefined: 1784 new_frame->SetVReg(reg, 0xEBADDE09); 1785 break; 1786 case kConstant: 1787 new_frame->SetVReg(reg, kinds.at((reg * 2) + 1)); 1788 break; 1789 case kReferenceVReg: 1790 new_frame->SetVRegReference(reg, 1791 reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kind))); 1792 break; 1793 default: 1794 new_frame->SetVReg(reg, GetVReg(m, reg, kind)); 1795 break; 1796 } 1797 } 1798 if (prev_shadow_frame_ != NULL) { 1799 prev_shadow_frame_->SetLink(new_frame); 1800 } else { 1801 top_shadow_frame_ = new_frame; 1802 } 1803 prev_shadow_frame_ = new_frame; 1804 return true; 1805 } 1806 1807 void DoLongJump() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1808 mirror::ArtMethod* catch_method = *handler_quick_frame_; 1809 if (catch_method == NULL) { 1810 if (kDebugExceptionDelivery) { 1811 LOG(INFO) << "Handler is upcall"; 1812 } 1813 } else { 1814 CHECK(!is_deoptimization_); 1815 if (kDebugExceptionDelivery) { 1816 const DexFile& dex_file = *catch_method->GetDeclaringClass()->GetDexCache()->GetDexFile(); 1817 int line_number = dex_file.GetLineNumFromPC(catch_method, handler_dex_pc_); 1818 LOG(INFO) << "Handler: " << PrettyMethod(catch_method) << " (line: " << line_number << ")"; 1819 } 1820 } 1821 if (clear_exception_) { 1822 // Exception was cleared as part of delivery. 1823 DCHECK(!self_->IsExceptionPending()); 1824 } else { 1825 // Put exception back in root set with clear throw location. 1826 self_->SetException(ThrowLocation(), exception_); 1827 } 1828 self_->EndAssertNoThreadSuspension(last_no_assert_suspension_cause_); 1829 // Do instrumentation events after allowing thread suspension again. 1830 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 1831 for (size_t i = 0; i < instrumentation_frames_to_pop_; ++i) { 1832 // We pop the instrumentation stack here so as not to corrupt it during the stack walk. 1833 if (i != instrumentation_frames_to_pop_ - 1 || self_->GetInstrumentationStack()->front().method_ != catch_method) { 1834 // Don't pop the instrumentation frame of the catch handler. 1835 instrumentation->PopMethodForUnwind(self_, is_deoptimization_); 1836 } 1837 } 1838 if (!is_deoptimization_) { 1839 instrumentation->ExceptionCaughtEvent(self_, throw_location_, catch_method, handler_dex_pc_, 1840 exception_); 1841 } else { 1842 // TODO: proper return value. 1843 self_->SetDeoptimizationShadowFrame(top_shadow_frame_); 1844 } 1845 // Place context back on thread so it will be available when we continue. 1846 self_->ReleaseLongJumpContext(context_); 1847 context_->SetSP(reinterpret_cast<uintptr_t>(handler_quick_frame_)); 1848 CHECK_NE(handler_quick_frame_pc_, 0u); 1849 context_->SetPC(handler_quick_frame_pc_); 1850 context_->SmashCallerSaves(); 1851 context_->DoLongJump(); 1852 } 1853 1854 private: 1855 Thread* const self_; 1856 mirror::Throwable* const exception_; 1857 const bool is_deoptimization_; 1858 // The type of the exception catch block to find. 1859 mirror::Class* const to_find_; 1860 // Location of the throw. 1861 const ThrowLocation& throw_location_; 1862 // Quick frame with found handler or last frame if no handler found. 1863 mirror::ArtMethod** handler_quick_frame_; 1864 // PC to branch to for the handler. 1865 uintptr_t handler_quick_frame_pc_; 1866 // Associated dex PC. 1867 uint32_t handler_dex_pc_; 1868 // Number of native methods passed in crawl (equates to number of SIRTs to pop) 1869 uint32_t native_method_count_; 1870 // Should the exception be cleared as the catch block has no move-exception? 1871 bool clear_exception_; 1872 // Is method tracing active? 1873 const bool method_tracing_active_; 1874 // Support for nesting no thread suspension checks. 1875 const char* last_no_assert_suspension_cause_; 1876 // Number of frames to pop in long jump. 1877 size_t instrumentation_frames_to_pop_; 1878 ShadowFrame* top_shadow_frame_; 1879 ShadowFrame* prev_shadow_frame_; 1880}; 1881 1882void Thread::QuickDeliverException() { 1883 // Get exception from thread. 1884 ThrowLocation throw_location; 1885 mirror::Throwable* exception = GetException(&throw_location); 1886 CHECK(exception != NULL); 1887 // Don't leave exception visible while we try to find the handler, which may cause class 1888 // resolution. 1889 ClearException(); 1890 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1891 if (kDebugExceptionDelivery) { 1892 if (!is_deoptimization) { 1893 mirror::String* msg = exception->GetDetailMessage(); 1894 std::string str_msg(msg != NULL ? msg->ToModifiedUtf8() : ""); 1895 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1896 << ": " << str_msg << "\n"); 1897 } else { 1898 DumpStack(LOG(INFO) << "Deoptimizing: "); 1899 } 1900 } 1901 CatchBlockStackVisitor catch_finder(this, throw_location, exception, is_deoptimization); 1902 catch_finder.WalkStack(true); 1903 catch_finder.DoLongJump(); 1904 LOG(FATAL) << "UNREACHABLE"; 1905} 1906 1907Context* Thread::GetLongJumpContext() { 1908 Context* result = long_jump_context_; 1909 if (result == NULL) { 1910 result = Context::Create(); 1911 } else { 1912 long_jump_context_ = NULL; // Avoid context being shared. 1913 result->Reset(); 1914 } 1915 return result; 1916} 1917 1918struct CurrentMethodVisitor : public StackVisitor { 1919 CurrentMethodVisitor(Thread* thread, Context* context) 1920 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1921 : StackVisitor(thread, context), this_object_(NULL), method_(NULL), dex_pc_(0) {} 1922 virtual bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1923 mirror::ArtMethod* m = GetMethod(); 1924 if (m->IsRuntimeMethod()) { 1925 // Continue if this is a runtime method. 1926 return true; 1927 } 1928 if (context_ != NULL) { 1929 this_object_ = GetThisObject(); 1930 } 1931 method_ = m; 1932 dex_pc_ = GetDexPc(); 1933 return false; 1934 } 1935 mirror::Object* this_object_; 1936 mirror::ArtMethod* method_; 1937 uint32_t dex_pc_; 1938}; 1939 1940mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1941 CurrentMethodVisitor visitor(const_cast<Thread*>(this), NULL); 1942 visitor.WalkStack(false); 1943 if (dex_pc != NULL) { 1944 *dex_pc = visitor.dex_pc_; 1945 } 1946 return visitor.method_; 1947} 1948 1949ThrowLocation Thread::GetCurrentLocationForThrow() { 1950 Context* context = GetLongJumpContext(); 1951 CurrentMethodVisitor visitor(this, context); 1952 visitor.WalkStack(false); 1953 ReleaseLongJumpContext(context); 1954 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1955} 1956 1957bool Thread::HoldsLock(mirror::Object* object) { 1958 if (object == NULL) { 1959 return false; 1960 } 1961 return object->GetLockOwnerThreadId() == thin_lock_thread_id_; 1962} 1963 1964// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1965template <typename RootVisitor> 1966class ReferenceMapVisitor : public StackVisitor { 1967 public: 1968 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1969 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1970 : StackVisitor(thread, context), visitor_(visitor) {} 1971 1972 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1973 if (false) { 1974 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1975 << StringPrintf("@ PC:%04x", GetDexPc()); 1976 } 1977 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1978 if (shadow_frame != NULL) { 1979 mirror::ArtMethod* m = shadow_frame->GetMethod(); 1980 size_t num_regs = shadow_frame->NumberOfVRegs(); 1981 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1982 // SIRT for JNI or References for interpreter. 1983 for (size_t reg = 0; reg < num_regs; ++reg) { 1984 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1985 if (ref != nullptr) { 1986 mirror::Object* new_ref = visitor_(ref, reg, this); 1987 if (new_ref != ref) { 1988 shadow_frame->SetVRegReference(reg, new_ref); 1989 } 1990 } 1991 } 1992 } else { 1993 // Java method. 1994 // Portable path use DexGcMap and store in Method.native_gc_map_. 1995 const uint8_t* gc_map = m->GetNativeGcMap(); 1996 CHECK(gc_map != NULL) << PrettyMethod(m); 1997 uint32_t gc_map_length = static_cast<uint32_t>((gc_map[0] << 24) | 1998 (gc_map[1] << 16) | 1999 (gc_map[2] << 8) | 2000 (gc_map[3] << 0)); 2001 verifier::DexPcToReferenceMap dex_gc_map(gc_map + 4, gc_map_length); 2002 uint32_t dex_pc = GetDexPc(); 2003 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2004 DCHECK(reg_bitmap != NULL); 2005 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2006 for (size_t reg = 0; reg < num_regs; ++reg) { 2007 if (TestBitmap(reg, reg_bitmap)) { 2008 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2009 if (ref != nullptr) { 2010 mirror::Object* new_ref = visitor_(ref, reg, this); 2011 if (new_ref != ref) { 2012 shadow_frame->SetVRegReference(reg, new_ref); 2013 } 2014 } 2015 } 2016 } 2017 } 2018 } else { 2019 mirror::ArtMethod* m = GetMethod(); 2020 // Process register map (which native and runtime methods don't have) 2021 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2022 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2023 CHECK(native_gc_map != NULL) << PrettyMethod(m); 2024 mh_.ChangeMethod(m); 2025 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 2026 DCHECK(code_item != NULL) << PrettyMethod(m); // Can't be NULL or how would we compile its instructions? 2027 NativePcOffsetToReferenceMap map(native_gc_map); 2028 size_t num_regs = std::min(map.RegWidth() * 8, 2029 static_cast<size_t>(code_item->registers_size_)); 2030 if (num_regs > 0) { 2031 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 2032 DCHECK(reg_bitmap != NULL); 2033 const VmapTable vmap_table(m->GetVmapTable()); 2034 uint32_t core_spills = m->GetCoreSpillMask(); 2035 uint32_t fp_spills = m->GetFpSpillMask(); 2036 size_t frame_size = m->GetFrameSizeInBytes(); 2037 // For all dex registers in the bitmap 2038 mirror::ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 2039 DCHECK(cur_quick_frame != NULL); 2040 for (size_t reg = 0; reg < num_regs; ++reg) { 2041 // Does this register hold a reference? 2042 if (TestBitmap(reg, reg_bitmap)) { 2043 uint32_t vmap_offset; 2044 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2045 int vmap_reg = vmap_table.ComputeRegister(core_spills, vmap_offset, kReferenceVReg); 2046 mirror::Object* ref = reinterpret_cast<mirror::Object*>(GetGPR(vmap_reg)); 2047 if (ref != nullptr) { 2048 mirror::Object* new_ref = visitor_(ref, reg, this); 2049 if (ref != new_ref) { 2050 SetGPR(vmap_reg, reinterpret_cast<uintptr_t>(new_ref)); 2051 } 2052 } 2053 } else { 2054 uint32_t* reg_addr = 2055 GetVRegAddr(cur_quick_frame, code_item, core_spills, fp_spills, frame_size, reg); 2056 mirror::Object* ref = reinterpret_cast<mirror::Object*>(*reg_addr); 2057 if (ref != nullptr) { 2058 mirror::Object* new_ref = visitor_(ref, reg, this); 2059 if (ref != new_ref) { 2060 *reg_addr = reinterpret_cast<uint32_t>(new_ref); 2061 } 2062 } 2063 } 2064 } 2065 } 2066 } 2067 } 2068 } 2069 return true; 2070 } 2071 2072 private: 2073 static bool TestBitmap(int reg, const uint8_t* reg_vector) { 2074 return ((reg_vector[reg / 8] >> (reg % 8)) & 0x01) != 0; 2075 } 2076 2077 // Visitor for when we visit a root. 2078 const RootVisitor& visitor_; 2079 2080 // A method helper we keep around to avoid dex file/cache re-computations. 2081 MethodHelper mh_; 2082}; 2083 2084class RootCallbackVisitor { 2085 public: 2086 RootCallbackVisitor(RootVisitor* visitor, void* arg) : visitor_(visitor), arg_(arg) {} 2087 2088 mirror::Object* operator()(mirror::Object* obj, size_t, const StackVisitor*) const { 2089 return visitor_(obj, arg_); 2090 } 2091 2092 private: 2093 RootVisitor* visitor_; 2094 void* arg_; 2095}; 2096 2097class VerifyCallbackVisitor { 2098 public: 2099 VerifyCallbackVisitor(VerifyRootVisitor* visitor, void* arg) 2100 : visitor_(visitor), 2101 arg_(arg) { 2102 } 2103 2104 void operator()(const mirror::Object* obj, size_t vreg, const StackVisitor* visitor) const { 2105 visitor_(obj, arg_, vreg, visitor); 2106 } 2107 2108 private: 2109 VerifyRootVisitor* const visitor_; 2110 void* const arg_; 2111}; 2112 2113void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2114 if (kIsDebugBuild) { 2115 Runtime::Current()->GetHeap()->VerifyObject(class_loader_override); 2116 } 2117 class_loader_override_ = class_loader_override; 2118} 2119 2120void Thread::VisitRoots(RootVisitor* visitor, void* arg) { 2121 if (opeer_ != nullptr) { 2122 opeer_ = visitor(opeer_, arg); 2123 } 2124 if (exception_ != nullptr) { 2125 exception_ = down_cast<mirror::Throwable*>(visitor(exception_, arg)); 2126 } 2127 throw_location_.VisitRoots(visitor, arg); 2128 if (class_loader_override_ != nullptr) { 2129 class_loader_override_ = down_cast<mirror::ClassLoader*>(visitor(class_loader_override_, arg)); 2130 } 2131 jni_env_->locals.VisitRoots(visitor, arg); 2132 jni_env_->monitors.VisitRoots(visitor, arg); 2133 2134 SirtVisitRoots(visitor, arg); 2135 2136 // Visit roots on this thread's stack 2137 Context* context = GetLongJumpContext(); 2138 RootCallbackVisitor visitorToCallback(visitor, arg); 2139 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2140 mapper.WalkStack(); 2141 ReleaseLongJumpContext(context); 2142 2143 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2144 if (frame.this_object_ != nullptr) { 2145 frame.this_object_ = visitor(frame.this_object_, arg); 2146 } 2147 DCHECK(frame.method_ != nullptr); 2148 frame.method_ = down_cast<mirror::ArtMethod*>(visitor(frame.method_, arg)); 2149 } 2150} 2151 2152static mirror::Object* VerifyRoot(mirror::Object* root, void* arg) { 2153 DCHECK(root != nullptr); 2154 DCHECK(arg != nullptr); 2155 reinterpret_cast<gc::Heap*>(arg)->VerifyObject(root); 2156 return root; 2157} 2158 2159void Thread::VerifyStackImpl() { 2160 UniquePtr<Context> context(Context::Create()); 2161 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap()); 2162 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2163 mapper.WalkStack(); 2164} 2165 2166// Set the stack end to that to be used during a stack overflow 2167void Thread::SetStackEndForStackOverflow() { 2168 // During stack overflow we allow use of the full stack. 2169 if (stack_end_ == stack_begin_) { 2170 // However, we seem to have already extended to use the full stack. 2171 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2172 << kStackOverflowReservedBytes << ")?"; 2173 DumpStack(LOG(ERROR)); 2174 LOG(FATAL) << "Recursive stack overflow."; 2175 } 2176 2177 stack_end_ = stack_begin_; 2178} 2179 2180std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2181 thread.ShortDump(os); 2182 return os; 2183} 2184 2185} // namespace art 2186