thread.cc revision e63db27db913f1a88e2095a1ee8239b2bb9124e8
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 "debugger.h" 38#include "dex_file-inl.h" 39#include "entrypoints/entrypoint_utils.h" 40#include "entrypoints/quick/quick_alloc_entrypoints.h" 41#include "gc_map.h" 42#include "gc/accounting/card_table-inl.h" 43#include "gc/allocator/rosalloc.h" 44#include "gc/heap.h" 45#include "gc/space/space.h" 46#include "handle_scope.h" 47#include "indirect_reference_table-inl.h" 48#include "jni_internal.h" 49#include "mirror/art_field-inl.h" 50#include "mirror/art_method-inl.h" 51#include "mirror/class-inl.h" 52#include "mirror/class_loader.h" 53#include "mirror/object_array-inl.h" 54#include "mirror/stack_trace_element.h" 55#include "monitor.h" 56#include "object_utils.h" 57#include "quick_exception_handler.h" 58#include "quick/quick_method_frame_info.h" 59#include "reflection.h" 60#include "runtime.h" 61#include "scoped_thread_state_change.h" 62#include "ScopedLocalRef.h" 63#include "ScopedUtfChars.h" 64#include "handle_scope-inl.h" 65#include "stack.h" 66#include "thread-inl.h" 67#include "thread_list.h" 68#include "utils.h" 69#include "verifier/dex_gc_map.h" 70#include "verify_object-inl.h" 71#include "vmap_table.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76bool Thread::is_started_ = false; 77pthread_key_t Thread::pthread_key_self_; 78ConditionVariable* Thread::resume_cond_ = nullptr; 79 80static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 81 82void Thread::InitCardTable() { 83 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 84} 85 86static void UnimplementedEntryPoint() { 87 UNIMPLEMENTED(FATAL); 88} 89 90void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 91 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 92 93void Thread::InitTlsEntryPoints() { 94 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 95 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 96 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + 97 sizeof(tlsPtr_.quick_entrypoints)); 98 for (uintptr_t* it = begin; it != end; ++it) { 99 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 100 } 101 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 102 &tlsPtr_.portable_entrypoints, &tlsPtr_.quick_entrypoints); 103} 104 105void Thread::ResetQuickAllocEntryPointsForThread() { 106 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 107} 108 109void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 110 tlsPtr_.deoptimization_shadow_frame = sf; 111} 112 113void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 114 tls64_.deoptimization_return_value.SetJ(ret_val.GetJ()); 115} 116 117ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 118 ShadowFrame* sf = tlsPtr_.deoptimization_shadow_frame; 119 tlsPtr_.deoptimization_shadow_frame = nullptr; 120 ret_val->SetJ(tls64_.deoptimization_return_value.GetJ()); 121 return sf; 122} 123 124void Thread::SetShadowFrameUnderConstruction(ShadowFrame* sf) { 125 sf->SetLink(tlsPtr_.shadow_frame_under_construction); 126 tlsPtr_.shadow_frame_under_construction = sf; 127} 128 129void Thread::ClearShadowFrameUnderConstruction() { 130 CHECK_NE(static_cast<ShadowFrame*>(nullptr), tlsPtr_.shadow_frame_under_construction); 131 tlsPtr_.shadow_frame_under_construction = tlsPtr_.shadow_frame_under_construction->GetLink(); 132} 133 134void Thread::InitTid() { 135 tls32_.tid = ::art::GetTid(); 136} 137 138void Thread::InitAfterFork() { 139 // One thread (us) survived the fork, but we have a new tid so we need to 140 // update the value stashed in this Thread*. 141 InitTid(); 142} 143 144void* Thread::CreateCallback(void* arg) { 145 Thread* self = reinterpret_cast<Thread*>(arg); 146 Runtime* runtime = Runtime::Current(); 147 if (runtime == nullptr) { 148 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 149 return nullptr; 150 } 151 { 152 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 153 // after self->Init(). 154 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 155 // Check that if we got here we cannot be shutting down (as shutdown should never have started 156 // while threads are being born). 157 CHECK(!runtime->IsShuttingDownLocked()); 158 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 159 Runtime::Current()->EndThreadBirth(); 160 } 161 { 162 ScopedObjectAccess soa(self); 163 164 // Copy peer into self, deleting global reference when done. 165 CHECK(self->tlsPtr_.jpeer != nullptr); 166 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 167 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 168 self->tlsPtr_.jpeer = nullptr; 169 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 170 Dbg::PostThreadStart(self); 171 172 // Invoke the 'run' method of our java.lang.Thread. 173 mirror::Object* receiver = self->tlsPtr_.opeer; 174 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 175 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 176 } 177 // Detach and delete self. 178 Runtime::Current()->GetThreadList()->Unregister(self); 179 180 return nullptr; 181} 182 183Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 184 mirror::Object* thread_peer) { 185 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 186 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 187 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 188 // to stop it from going away. 189 if (kIsDebugBuild) { 190 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 191 if (result != nullptr && !result->IsSuspended()) { 192 Locks::thread_list_lock_->AssertHeld(soa.Self()); 193 } 194 } 195 return result; 196} 197 198Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 199 jobject java_thread) { 200 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 201} 202 203static size_t FixStackSize(size_t stack_size) { 204 // A stack size of zero means "use the default". 205 if (stack_size == 0) { 206 stack_size = Runtime::Current()->GetDefaultStackSize(); 207 } 208 209 // Dalvik used the bionic pthread default stack size for native threads, 210 // so include that here to support apps that expect large native stacks. 211 stack_size += 1 * MB; 212 213 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 214 if (stack_size < PTHREAD_STACK_MIN) { 215 stack_size = PTHREAD_STACK_MIN; 216 } 217 218 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 219 // It's likely that callers are trying to ensure they have at least a certain amount of 220 // stack space, so we should add our reserved space on top of what they requested, rather 221 // than implicitly take it away from them. 222 stack_size += kRuntimeStackOverflowReservedBytes; 223 } else { 224 // If we are going to use implicit stack checks, allocate space for the protected 225 // region at the bottom of the stack. 226 stack_size += Thread::kStackOverflowImplicitCheckSize; 227 } 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} 234 235// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 236// overflow is detected. It is located right below the stack_end_. Just below that 237// is the StackOverflow reserved region used when creating the StackOverflow 238// exception. 239void Thread::InstallImplicitProtection(bool is_main_stack) { 240 byte* pregion = tlsPtr_.stack_end; 241 242 constexpr uint32_t kMarker = 0xdadadada; 243 uintptr_t *marker = reinterpret_cast<uintptr_t*>(pregion); 244 if (*marker == kMarker) { 245 // The region has already been set up. 246 return; 247 } 248 // Add marker so that we can detect a second attempt to do this. 249 *marker = kMarker; 250 251 pregion -= kStackOverflowProtectedSize; 252 253 // Touch the pages in the region to map them in. Otherwise mprotect fails. Only 254 // need to do this on the main stack. We only need to touch one byte per page. 255 if (is_main_stack) { 256 byte* start = pregion; 257 byte* end = pregion + kStackOverflowProtectedSize; 258 while (start < end) { 259 *start = static_cast<byte>(0); 260 start += kPageSize; 261 } 262 } 263 264 VLOG(threads) << "installing stack protected region at " << std::hex << 265 static_cast<void*>(pregion) << " to " << 266 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 267 268 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 269 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. Reason:" 270 << strerror(errno); 271 } 272 273 // Tell the kernel that we won't be needing these pages any more. 274 if (is_main_stack) { 275 madvise(pregion, kStackOverflowProtectedSize, MADV_DONTNEED); 276 } 277} 278 279void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 280 CHECK(java_peer != nullptr); 281 Thread* self = static_cast<JNIEnvExt*>(env)->self; 282 Runtime* runtime = Runtime::Current(); 283 284 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 285 bool thread_start_during_shutdown = false; 286 { 287 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 288 if (runtime->IsShuttingDownLocked()) { 289 thread_start_during_shutdown = true; 290 } else { 291 runtime->StartThreadBirth(); 292 } 293 } 294 if (thread_start_during_shutdown) { 295 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 296 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 297 return; 298 } 299 300 Thread* child_thread = new Thread(is_daemon); 301 // Use global JNI ref to hold peer live while child thread starts. 302 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 303 stack_size = FixStackSize(stack_size); 304 305 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 306 // assign it. 307 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 308 reinterpret_cast<jlong>(child_thread)); 309 310 pthread_t new_pthread; 311 pthread_attr_t attr; 312 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 313 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 314 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 315 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 316 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 317 318 if (pthread_create_result != 0) { 319 // pthread_create(3) failed, so clean up. 320 { 321 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 322 runtime->EndThreadBirth(); 323 } 324 // Manually delete the global reference since Thread::Init will not have been run. 325 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 326 child_thread->tlsPtr_.jpeer = nullptr; 327 delete child_thread; 328 child_thread = nullptr; 329 // TODO: remove from thread group? 330 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 331 { 332 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 333 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 334 ScopedObjectAccess soa(env); 335 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 336 } 337 } 338} 339 340void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 341 // This function does all the initialization that must be run by the native thread it applies to. 342 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 343 // we can handshake with the corresponding native thread when it's ready.) Check this native 344 // thread hasn't been through here already... 345 CHECK(Thread::Current() == nullptr); 346 SetUpAlternateSignalStack(); 347 InitCpu(); 348 InitTlsEntryPoints(); 349 RemoveSuspendTrigger(); 350 InitCardTable(); 351 InitTid(); 352 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 353 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 354 tlsPtr_.pthread_self = pthread_self(); 355 CHECK(is_started_); 356 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 357 DCHECK_EQ(Thread::Current(), this); 358 359 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 360 InitStackHwm(); 361 362 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 363 thread_list->Register(this); 364} 365 366Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 367 bool create_peer) { 368 Thread* self; 369 Runtime* runtime = Runtime::Current(); 370 if (runtime == nullptr) { 371 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 372 return nullptr; 373 } 374 { 375 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 376 if (runtime->IsShuttingDownLocked()) { 377 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 378 return nullptr; 379 } else { 380 Runtime::Current()->StartThreadBirth(); 381 self = new Thread(as_daemon); 382 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 383 Runtime::Current()->EndThreadBirth(); 384 } 385 } 386 387 CHECK_NE(self->GetState(), kRunnable); 388 self->SetState(kNative); 389 390 // If we're the main thread, ClassLinker won't be created until after we're attached, 391 // so that thread needs a two-stage attach. Regular threads don't need this hack. 392 // In the compiler, all threads need this hack, because no-one's going to be getting 393 // a native peer! 394 if (create_peer) { 395 self->CreatePeer(thread_name, as_daemon, thread_group); 396 } else { 397 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 398 if (thread_name != nullptr) { 399 self->tlsPtr_.name->assign(thread_name); 400 ::art::SetThreadName(thread_name); 401 } 402 } 403 404 return self; 405} 406 407void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 408 Runtime* runtime = Runtime::Current(); 409 CHECK(runtime->IsStarted()); 410 JNIEnv* env = tlsPtr_.jni_env; 411 412 if (thread_group == nullptr) { 413 thread_group = runtime->GetMainThreadGroup(); 414 } 415 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 416 jint thread_priority = GetNativePriority(); 417 jboolean thread_is_daemon = as_daemon; 418 419 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 420 if (peer.get() == nullptr) { 421 CHECK(IsExceptionPending()); 422 return; 423 } 424 { 425 ScopedObjectAccess soa(this); 426 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 427 } 428 env->CallNonvirtualVoidMethod(peer.get(), 429 WellKnownClasses::java_lang_Thread, 430 WellKnownClasses::java_lang_Thread_init, 431 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 432 AssertNoPendingException(); 433 434 Thread* self = this; 435 DCHECK_EQ(self, Thread::Current()); 436 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 437 reinterpret_cast<jlong>(self)); 438 439 ScopedObjectAccess soa(self); 440 StackHandleScope<1> hs(self); 441 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 442 if (peer_thread_name.Get() == nullptr) { 443 // The Thread constructor should have set the Thread.name to a 444 // non-null value. However, because we can run without code 445 // available (in the compiler, in tests), we manually assign the 446 // fields the constructor should have set. 447 if (runtime->IsActiveTransaction()) { 448 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 449 } else { 450 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 451 } 452 peer_thread_name.Assign(GetThreadName(soa)); 453 } 454 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 455 if (peer_thread_name.Get() != nullptr) { 456 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 457 } 458} 459 460template<bool kTransactionActive> 461void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 462 jobject thread_name, jint thread_priority) { 463 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 464 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 465 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 466 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 467 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 468 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 469 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 470 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 471} 472 473void Thread::SetThreadName(const char* name) { 474 tlsPtr_.name->assign(name); 475 ::art::SetThreadName(name); 476 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 477} 478 479void Thread::InitStackHwm() { 480 void* read_stack_base; 481 size_t read_stack_size; 482 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 483 484 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 485 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 486 PrettySize(read_stack_size).c_str()); 487 488 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 489 tlsPtr_.stack_size = read_stack_size; 490 491 if (read_stack_size <= kRuntimeStackOverflowReservedBytes) { 492 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 493 << " bytes)"; 494 } 495 496 // TODO: move this into the Linux GetThreadStack implementation. 497#if defined(__APPLE__) 498 bool is_main_thread = false; 499#else 500 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 501 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 502 // will be broken because we'll die long before we get close to 2GB. 503 bool is_main_thread = (::art::GetTid() == getpid()); 504 if (is_main_thread) { 505 rlimit stack_limit; 506 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 507 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 508 } 509 if (stack_limit.rlim_cur == RLIM_INFINITY) { 510 // Find the default stack size for new threads... 511 pthread_attr_t default_attributes; 512 size_t default_stack_size; 513 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 514 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 515 "default stack size query"); 516 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 517 518 // ...and use that as our limit. 519 size_t old_stack_size = read_stack_size; 520 tlsPtr_.stack_size = default_stack_size; 521 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 522 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 523 << " to " << PrettySize(default_stack_size) 524 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 525 } 526 } 527#endif 528 529 // Set stack_end_ to the bottom of the stack saving space of stack overflows 530 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 531 ResetDefaultStackEnd(implicit_stack_check); 532 533 // Install the protected region if we are doing implicit overflow checks. 534 if (implicit_stack_check) { 535 if (is_main_thread) { 536 // The main thread has a 16K protected region at the bottom. We need 537 // to install our own region so we need to move the limits 538 // of the stack to make room for it. 539 constexpr uint32_t kDelta = 16 * KB; 540 tlsPtr_.stack_begin += kDelta; 541 tlsPtr_.stack_end += kDelta; 542 tlsPtr_.stack_size -= kDelta; 543 } 544 InstallImplicitProtection(is_main_thread); 545 } 546 547 // Sanity check. 548 int stack_variable; 549 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 550} 551 552void Thread::ShortDump(std::ostream& os) const { 553 os << "Thread["; 554 if (GetThreadId() != 0) { 555 // If we're in kStarting, we won't have a thin lock id or tid yet. 556 os << GetThreadId() 557 << ",tid=" << GetTid() << ','; 558 } 559 os << GetState() 560 << ",Thread*=" << this 561 << ",peer=" << tlsPtr_.opeer 562 << ",\"" << *tlsPtr_.name << "\"" 563 << "]"; 564} 565 566void Thread::Dump(std::ostream& os) const { 567 DumpState(os); 568 DumpStack(os); 569} 570 571mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 572 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 573 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 574} 575 576void Thread::GetThreadName(std::string& name) const { 577 name.assign(*tlsPtr_.name); 578} 579 580uint64_t Thread::GetCpuMicroTime() const { 581#if defined(HAVE_POSIX_CLOCKS) 582 clockid_t cpu_clock_id; 583 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 584 timespec now; 585 clock_gettime(cpu_clock_id, &now); 586 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 587#else 588 UNIMPLEMENTED(WARNING); 589 return -1; 590#endif 591} 592 593// Attempt to rectify locks so that we dump thread list with required locks before exiting. 594static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 595 LOG(ERROR) << *thread << " suspend count already zero."; 596 Locks::thread_suspend_count_lock_->Unlock(self); 597 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 598 Locks::mutator_lock_->SharedTryLock(self); 599 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 600 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 601 } 602 } 603 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 604 Locks::thread_list_lock_->TryLock(self); 605 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 606 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 607 } 608 } 609 std::ostringstream ss; 610 Runtime::Current()->GetThreadList()->DumpLocked(ss); 611 LOG(FATAL) << ss.str(); 612} 613 614void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 615 if (kIsDebugBuild) { 616 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 617 << delta << " " << tls32_.debug_suspend_count << " " << this; 618 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 619 Locks::thread_suspend_count_lock_->AssertHeld(self); 620 if (this != self && !IsSuspended()) { 621 Locks::thread_list_lock_->AssertHeld(self); 622 } 623 } 624 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 625 UnsafeLogFatalForSuspendCount(self, this); 626 return; 627 } 628 629 tls32_.suspend_count += delta; 630 if (for_debugger) { 631 tls32_.debug_suspend_count += delta; 632 } 633 634 if (tls32_.suspend_count == 0) { 635 AtomicClearFlag(kSuspendRequest); 636 } else { 637 AtomicSetFlag(kSuspendRequest); 638 TriggerSuspend(); 639 } 640} 641 642void Thread::RunCheckpointFunction() { 643 Closure *checkpoints[kMaxCheckpoints]; 644 645 // Grab the suspend_count lock and copy the current set of 646 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 647 // function will also grab this lock so we prevent a race between setting 648 // the kCheckpointRequest flag and clearing it. 649 { 650 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 651 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 652 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 653 tlsPtr_.checkpoint_functions[i] = nullptr; 654 } 655 AtomicClearFlag(kCheckpointRequest); 656 } 657 658 // Outside the lock, run all the checkpoint functions that 659 // we collected. 660 bool found_checkpoint = false; 661 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 662 if (checkpoints[i] != nullptr) { 663 ATRACE_BEGIN("Checkpoint function"); 664 checkpoints[i]->Run(this); 665 ATRACE_END(); 666 found_checkpoint = true; 667 } 668 } 669 CHECK(found_checkpoint); 670} 671 672bool Thread::RequestCheckpoint(Closure* function) { 673 union StateAndFlags old_state_and_flags; 674 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 675 if (old_state_and_flags.as_struct.state != kRunnable) { 676 return false; // Fail, thread is suspended and so can't run a checkpoint. 677 } 678 679 uint32_t available_checkpoint = kMaxCheckpoints; 680 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 681 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 682 available_checkpoint = i; 683 break; 684 } 685 } 686 if (available_checkpoint == kMaxCheckpoints) { 687 // No checkpoint functions available, we can't run a checkpoint 688 return false; 689 } 690 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 691 692 // Checkpoint function installed now install flag bit. 693 // We must be runnable to request a checkpoint. 694 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 695 union StateAndFlags new_state_and_flags; 696 new_state_and_flags.as_int = old_state_and_flags.as_int; 697 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 698 bool success = 699 tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent(old_state_and_flags.as_int, 700 new_state_and_flags.as_int); 701 if (UNLIKELY(!success)) { 702 // The thread changed state before the checkpoint was installed. 703 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 704 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 705 } else { 706 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 707 TriggerSuspend(); 708 } 709 return success; 710} 711 712void Thread::FullSuspendCheck() { 713 VLOG(threads) << this << " self-suspending"; 714 ATRACE_BEGIN("Full suspend check"); 715 // Make thread appear suspended to other threads, release mutator_lock_. 716 TransitionFromRunnableToSuspended(kSuspended); 717 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 718 TransitionFromSuspendedToRunnable(); 719 ATRACE_END(); 720 VLOG(threads) << this << " self-reviving"; 721} 722 723void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 724 std::string group_name; 725 int priority; 726 bool is_daemon = false; 727 Thread* self = Thread::Current(); 728 729 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 730 // cause ScopedObjectAccessUnchecked to deadlock. 731 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 732 ScopedObjectAccessUnchecked soa(self); 733 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 734 ->GetInt(thread->tlsPtr_.opeer); 735 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 736 ->GetBoolean(thread->tlsPtr_.opeer); 737 738 mirror::Object* thread_group = 739 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 740 741 if (thread_group != nullptr) { 742 mirror::ArtField* group_name_field = 743 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 744 mirror::String* group_name_string = 745 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 746 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 747 } 748 } else { 749 priority = GetNativePriority(); 750 } 751 752 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 753 if (scheduler_group_name.empty()) { 754 scheduler_group_name = "default"; 755 } 756 757 if (thread != nullptr) { 758 os << '"' << *thread->tlsPtr_.name << '"'; 759 if (is_daemon) { 760 os << " daemon"; 761 } 762 os << " prio=" << priority 763 << " tid=" << thread->GetThreadId() 764 << " " << thread->GetState(); 765 if (thread->IsStillStarting()) { 766 os << " (still starting up)"; 767 } 768 os << "\n"; 769 } else { 770 os << '"' << ::art::GetThreadName(tid) << '"' 771 << " prio=" << priority 772 << " (not attached)\n"; 773 } 774 775 if (thread != nullptr) { 776 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 777 os << " | group=\"" << group_name << "\"" 778 << " sCount=" << thread->tls32_.suspend_count 779 << " dsCount=" << thread->tls32_.debug_suspend_count 780 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 781 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 782 } 783 784 os << " | sysTid=" << tid 785 << " nice=" << getpriority(PRIO_PROCESS, tid) 786 << " cgrp=" << scheduler_group_name; 787 if (thread != nullptr) { 788 int policy; 789 sched_param sp; 790 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 791 __FUNCTION__); 792 os << " sched=" << policy << "/" << sp.sched_priority 793 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 794 } 795 os << "\n"; 796 797 // Grab the scheduler stats for this thread. 798 std::string scheduler_stats; 799 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 800 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 801 } else { 802 scheduler_stats = "0 0 0"; 803 } 804 805 char native_thread_state = '?'; 806 int utime = 0; 807 int stime = 0; 808 int task_cpu = 0; 809 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 810 811 os << " | state=" << native_thread_state 812 << " schedstat=( " << scheduler_stats << " )" 813 << " utm=" << utime 814 << " stm=" << stime 815 << " core=" << task_cpu 816 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 817 if (thread != nullptr) { 818 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 819 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 820 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 821 // Dump the held mutexes. 822 os << " | held mutexes="; 823 for (size_t i = 0; i < kLockLevelCount; ++i) { 824 if (i != kMonitorLock) { 825 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 826 if (mutex != nullptr) { 827 os << " \"" << mutex->GetName() << "\""; 828 if (mutex->IsReaderWriterMutex()) { 829 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 830 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 831 os << "(exclusive held)"; 832 } else { 833 os << "(shared held)"; 834 } 835 } 836 } 837 } 838 } 839 os << "\n"; 840 } 841} 842 843void Thread::DumpState(std::ostream& os) const { 844 Thread::DumpState(os, this, GetTid()); 845} 846 847struct StackDumpVisitor : public StackVisitor { 848 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 849 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 850 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 851 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 852 } 853 854 virtual ~StackDumpVisitor() { 855 if (frame_count == 0) { 856 os << " (no managed stack frames)\n"; 857 } 858 } 859 860 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 861 mirror::ArtMethod* m = GetMethod(); 862 if (m->IsRuntimeMethod()) { 863 return true; 864 } 865 const int kMaxRepetition = 3; 866 mirror::Class* c = m->GetDeclaringClass(); 867 mirror::DexCache* dex_cache = c->GetDexCache(); 868 int line_number = -1; 869 if (dex_cache != nullptr) { // be tolerant of bad input 870 const DexFile& dex_file = *dex_cache->GetDexFile(); 871 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 872 } 873 if (line_number == last_line_number && last_method == m) { 874 ++repetition_count; 875 } else { 876 if (repetition_count >= kMaxRepetition) { 877 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 878 } 879 repetition_count = 0; 880 last_line_number = line_number; 881 last_method = m; 882 } 883 if (repetition_count < kMaxRepetition) { 884 os << " at " << PrettyMethod(m, false); 885 if (m->IsNative()) { 886 os << "(Native method)"; 887 } else { 888 const char* source_file(m->GetDeclaringClassSourceFile()); 889 os << "(" << (source_file != nullptr ? source_file : "unavailable") 890 << ":" << line_number << ")"; 891 } 892 os << "\n"; 893 if (frame_count == 0) { 894 Monitor::DescribeWait(os, thread); 895 } 896 if (can_allocate) { 897 Monitor::VisitLocks(this, DumpLockedObject, &os); 898 } 899 } 900 901 ++frame_count; 902 return true; 903 } 904 905 static void DumpLockedObject(mirror::Object* o, void* context) 906 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 907 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 908 os << " - locked "; 909 if (o == nullptr) { 910 os << "an unknown object"; 911 } else { 912 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 913 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 914 // Getting the identity hashcode here would result in lock inflation and suspension of the 915 // current thread, which isn't safe if this is the only runnable thread. 916 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 917 PrettyTypeOf(o).c_str()); 918 } else { 919 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 920 } 921 } 922 os << "\n"; 923 } 924 925 std::ostream& os; 926 const Thread* thread; 927 const bool can_allocate; 928 mirror::ArtMethod* method; 929 mirror::ArtMethod* last_method; 930 int last_line_number; 931 int repetition_count; 932 int frame_count; 933}; 934 935static bool ShouldShowNativeStack(const Thread* thread) 936 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 937 ThreadState state = thread->GetState(); 938 939 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 940 if (state > kWaiting && state < kStarting) { 941 return true; 942 } 943 944 // In an Object.wait variant or Thread.sleep? That's not interesting. 945 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 946 return false; 947 } 948 949 // In some other native method? That's interesting. 950 // We don't just check kNative because native methods will be in state kSuspended if they're 951 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 952 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 953 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 954 return current_method != nullptr && current_method->IsNative(); 955} 956 957void Thread::DumpJavaStack(std::ostream& os) const { 958 std::unique_ptr<Context> context(Context::Create()); 959 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 960 !tls32_.throwing_OutOfMemoryError); 961 dumper.WalkStack(); 962} 963 964void Thread::DumpStack(std::ostream& os) const { 965 // TODO: we call this code when dying but may not have suspended the thread ourself. The 966 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 967 // the race with the thread_suspend_count_lock_). 968 bool dump_for_abort = (gAborting > 0); 969 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 970 if (!kIsDebugBuild) { 971 // We always want to dump the stack for an abort, however, there is no point dumping another 972 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 973 safe_to_dump = (safe_to_dump || dump_for_abort); 974 } 975 if (safe_to_dump) { 976 // If we're currently in native code, dump that stack before dumping the managed stack. 977 if (dump_for_abort || ShouldShowNativeStack(this)) { 978 DumpKernelStack(os, GetTid(), " kernel: ", false); 979 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr)); 980 } 981 DumpJavaStack(os); 982 } else { 983 os << "Not able to dump stack of thread that isn't suspended"; 984 } 985} 986 987void Thread::ThreadExitCallback(void* arg) { 988 Thread* self = reinterpret_cast<Thread*>(arg); 989 if (self->tls32_.thread_exit_check_count == 0) { 990 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 991 "going to use a pthread_key_create destructor?): " << *self; 992 CHECK(is_started_); 993 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 994 self->tls32_.thread_exit_check_count = 1; 995 } else { 996 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 997 } 998} 999 1000void Thread::Startup() { 1001 CHECK(!is_started_); 1002 is_started_ = true; 1003 { 1004 // MutexLock to keep annotalysis happy. 1005 // 1006 // Note we use nullptr for the thread because Thread::Current can 1007 // return garbage since (is_started_ == true) and 1008 // Thread::pthread_key_self_ is not yet initialized. 1009 // This was seen on glibc. 1010 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1011 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1012 *Locks::thread_suspend_count_lock_); 1013 } 1014 1015 // Allocate a TLS slot. 1016 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1017 1018 // Double-check the TLS slot allocation. 1019 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1020 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1021 } 1022} 1023 1024void Thread::FinishStartup() { 1025 Runtime* runtime = Runtime::Current(); 1026 CHECK(runtime->IsStarted()); 1027 1028 // Finish attaching the main thread. 1029 ScopedObjectAccess soa(Thread::Current()); 1030 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1031 1032 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1033} 1034 1035void Thread::Shutdown() { 1036 CHECK(is_started_); 1037 is_started_ = false; 1038 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1039 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1040 if (resume_cond_ != nullptr) { 1041 delete resume_cond_; 1042 resume_cond_ = nullptr; 1043 } 1044} 1045 1046Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1047 wait_mutex_ = new Mutex("a thread wait mutex"); 1048 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1049 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1050 tlsPtr_.single_step_control = new SingleStepControl; 1051 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1052 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1053 1054 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1055 tls32_.state_and_flags.as_struct.flags = 0; 1056 tls32_.state_and_flags.as_struct.state = kNative; 1057 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1058 std::fill(tlsPtr_.rosalloc_runs, 1059 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1060 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1061 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1062 tlsPtr_.checkpoint_functions[i] = nullptr; 1063 } 1064} 1065 1066bool Thread::IsStillStarting() const { 1067 // You might think you can check whether the state is kStarting, but for much of thread startup, 1068 // the thread is in kNative; it might also be in kVmWait. 1069 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1070 // assigned fairly early on, and needs to be. 1071 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1072 // this thread _ever_ entered kRunnable". 1073 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1074 (*tlsPtr_.name == kThreadNameDuringStartup); 1075} 1076 1077void Thread::AssertNoPendingException() const { 1078 if (UNLIKELY(IsExceptionPending())) { 1079 ScopedObjectAccess soa(Thread::Current()); 1080 mirror::Throwable* exception = GetException(nullptr); 1081 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1082 } 1083} 1084 1085void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1086 if (UNLIKELY(IsExceptionPending())) { 1087 ScopedObjectAccess soa(Thread::Current()); 1088 mirror::Throwable* exception = GetException(nullptr); 1089 LOG(FATAL) << "Throwing new exception " << msg << " with unexpected pending exception: " 1090 << exception->Dump(); 1091 } 1092} 1093 1094static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1095 RootType /*root_type*/) 1096 NO_THREAD_SAFETY_ANALYSIS { 1097 Thread* self = reinterpret_cast<Thread*>(arg); 1098 mirror::Object* entered_monitor = *object; 1099 if (self->HoldsLock(entered_monitor)) { 1100 LOG(WARNING) << "Calling MonitorExit on object " 1101 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1102 << " left locked by native thread " 1103 << *Thread::Current() << " which is detaching"; 1104 entered_monitor->MonitorExit(self); 1105 } 1106} 1107 1108void Thread::Destroy() { 1109 Thread* self = this; 1110 DCHECK_EQ(self, Thread::Current()); 1111 1112 if (tlsPtr_.opeer != nullptr) { 1113 ScopedObjectAccess soa(self); 1114 // We may need to call user-supplied managed code, do this before final clean-up. 1115 HandleUncaughtExceptions(soa); 1116 RemoveFromThreadGroup(soa); 1117 1118 // this.nativePeer = 0; 1119 if (Runtime::Current()->IsActiveTransaction()) { 1120 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1121 ->SetLong<true>(tlsPtr_.opeer, 0); 1122 } else { 1123 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1124 ->SetLong<false>(tlsPtr_.opeer, 0); 1125 } 1126 Dbg::PostThreadDeath(self); 1127 1128 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1129 // who is waiting. 1130 mirror::Object* lock = 1131 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1132 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1133 if (lock != nullptr) { 1134 StackHandleScope<1> hs(self); 1135 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1136 ObjectLock<mirror::Object> locker(self, h_obj); 1137 locker.NotifyAll(); 1138 } 1139 } 1140 1141 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1142 if (tlsPtr_.jni_env != nullptr) { 1143 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1144 } 1145} 1146 1147Thread::~Thread() { 1148 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1149 // If pthread_create fails we don't have a jni env here. 1150 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1151 tlsPtr_.jpeer = nullptr; 1152 } 1153 tlsPtr_.opeer = nullptr; 1154 1155 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1156 if (initialized) { 1157 delete tlsPtr_.jni_env; 1158 tlsPtr_.jni_env = nullptr; 1159 } 1160 CHECK_NE(GetState(), kRunnable); 1161 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1162 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1163 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1164 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1165 1166 // We may be deleting a still born thread. 1167 SetStateUnsafe(kTerminated); 1168 1169 delete wait_cond_; 1170 delete wait_mutex_; 1171 1172 if (tlsPtr_.long_jump_context != nullptr) { 1173 delete tlsPtr_.long_jump_context; 1174 } 1175 1176 if (initialized) { 1177 CleanupCpu(); 1178 } 1179 1180 delete tlsPtr_.debug_invoke_req; 1181 delete tlsPtr_.single_step_control; 1182 delete tlsPtr_.instrumentation_stack; 1183 delete tlsPtr_.name; 1184 delete tlsPtr_.stack_trace_sample; 1185 1186 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1187 1188 TearDownAlternateSignalStack(); 1189} 1190 1191void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1192 if (!IsExceptionPending()) { 1193 return; 1194 } 1195 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1196 ScopedThreadStateChange tsc(this, kNative); 1197 1198 // Get and clear the exception. 1199 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1200 tlsPtr_.jni_env->ExceptionClear(); 1201 1202 // If the thread has its own handler, use that. 1203 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1204 tlsPtr_.jni_env->GetObjectField(peer.get(), 1205 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1206 if (handler.get() == nullptr) { 1207 // Otherwise use the thread group's default handler. 1208 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1209 WellKnownClasses::java_lang_Thread_group)); 1210 } 1211 1212 // Call the handler. 1213 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1214 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1215 peer.get(), exception.get()); 1216 1217 // If the handler threw, clear that exception too. 1218 tlsPtr_.jni_env->ExceptionClear(); 1219} 1220 1221void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1222 // this.group.removeThread(this); 1223 // group can be null if we're in the compiler or a test. 1224 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1225 ->GetObject(tlsPtr_.opeer); 1226 if (ogroup != nullptr) { 1227 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1228 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1229 ScopedThreadStateChange tsc(soa.Self(), kNative); 1230 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1231 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1232 peer.get()); 1233 } 1234} 1235 1236size_t Thread::NumHandleReferences() { 1237 size_t count = 0; 1238 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1239 count += cur->NumberOfReferences(); 1240 } 1241 return count; 1242} 1243 1244bool Thread::HandleScopeContains(jobject obj) const { 1245 StackReference<mirror::Object>* hs_entry = 1246 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1247 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1248 if (cur->Contains(hs_entry)) { 1249 return true; 1250 } 1251 } 1252 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1253 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1254} 1255 1256void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1257 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1258 size_t num_refs = cur->NumberOfReferences(); 1259 for (size_t j = 0; j < num_refs; ++j) { 1260 mirror::Object* object = cur->GetReference(j); 1261 if (object != nullptr) { 1262 mirror::Object* old_obj = object; 1263 visitor(&object, arg, thread_id, kRootNativeStack); 1264 if (old_obj != object) { 1265 cur->SetReference(j, object); 1266 } 1267 } 1268 } 1269 } 1270} 1271 1272mirror::Object* Thread::DecodeJObject(jobject obj) const { 1273 Locks::mutator_lock_->AssertSharedHeld(this); 1274 if (obj == nullptr) { 1275 return nullptr; 1276 } 1277 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1278 IndirectRefKind kind = GetIndirectRefKind(ref); 1279 mirror::Object* result; 1280 // The "kinds" below are sorted by the frequency we expect to encounter them. 1281 if (kind == kLocal) { 1282 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1283 // Local references do not need a read barrier. 1284 result = locals.Get<kWithoutReadBarrier>(ref); 1285 } else if (kind == kHandleScopeOrInvalid) { 1286 // TODO: make stack indirect reference table lookup more efficient. 1287 // Check if this is a local reference in the handle scope. 1288 if (LIKELY(HandleScopeContains(obj))) { 1289 // Read from handle scope. 1290 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1291 VerifyObject(result); 1292 } else { 1293 result = kInvalidIndirectRefObject; 1294 } 1295 } else if (kind == kGlobal) { 1296 JavaVMExt* const vm = Runtime::Current()->GetJavaVM(); 1297 result = vm->globals.SynchronizedGet(const_cast<Thread*>(this), &vm->globals_lock, ref); 1298 } else { 1299 DCHECK_EQ(kind, kWeakGlobal); 1300 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1301 if (result == kClearedJniWeakGlobal) { 1302 // This is a special case where it's okay to return nullptr. 1303 return nullptr; 1304 } 1305 } 1306 1307 if (UNLIKELY(result == nullptr)) { 1308 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1309 } 1310 return result; 1311} 1312 1313// Implements java.lang.Thread.interrupted. 1314bool Thread::Interrupted() { 1315 MutexLock mu(Thread::Current(), *wait_mutex_); 1316 bool interrupted = IsInterruptedLocked(); 1317 SetInterruptedLocked(false); 1318 return interrupted; 1319} 1320 1321// Implements java.lang.Thread.isInterrupted. 1322bool Thread::IsInterrupted() { 1323 MutexLock mu(Thread::Current(), *wait_mutex_); 1324 return IsInterruptedLocked(); 1325} 1326 1327void Thread::Interrupt(Thread* self) { 1328 MutexLock mu(self, *wait_mutex_); 1329 if (interrupted_) { 1330 return; 1331 } 1332 interrupted_ = true; 1333 NotifyLocked(self); 1334} 1335 1336void Thread::Notify() { 1337 Thread* self = Thread::Current(); 1338 MutexLock mu(self, *wait_mutex_); 1339 NotifyLocked(self); 1340} 1341 1342void Thread::NotifyLocked(Thread* self) { 1343 if (wait_monitor_ != nullptr) { 1344 wait_cond_->Signal(self); 1345 } 1346} 1347 1348class CountStackDepthVisitor : public StackVisitor { 1349 public: 1350 explicit CountStackDepthVisitor(Thread* thread) 1351 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1352 : StackVisitor(thread, nullptr), 1353 depth_(0), skip_depth_(0), skipping_(true) {} 1354 1355 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1356 // We want to skip frames up to and including the exception's constructor. 1357 // Note we also skip the frame if it doesn't have a method (namely the callee 1358 // save frame) 1359 mirror::ArtMethod* m = GetMethod(); 1360 if (skipping_ && !m->IsRuntimeMethod() && 1361 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1362 skipping_ = false; 1363 } 1364 if (!skipping_) { 1365 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1366 ++depth_; 1367 } 1368 } else { 1369 ++skip_depth_; 1370 } 1371 return true; 1372 } 1373 1374 int GetDepth() const { 1375 return depth_; 1376 } 1377 1378 int GetSkipDepth() const { 1379 return skip_depth_; 1380 } 1381 1382 private: 1383 uint32_t depth_; 1384 uint32_t skip_depth_; 1385 bool skipping_; 1386}; 1387 1388template<bool kTransactionActive> 1389class BuildInternalStackTraceVisitor : public StackVisitor { 1390 public: 1391 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1392 : StackVisitor(thread, nullptr), self_(self), 1393 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1394 1395 bool Init(int depth) 1396 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1397 // Allocate method trace with an extra slot that will hold the PC trace 1398 StackHandleScope<1> hs(self_); 1399 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1400 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1401 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1402 if (method_trace.Get() == nullptr) { 1403 return false; 1404 } 1405 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1406 if (dex_pc_trace == nullptr) { 1407 return false; 1408 } 1409 // Save PC trace in last element of method trace, also places it into the 1410 // object graph. 1411 // We are called from native: use non-transactional mode. 1412 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1413 // Set the Object*s and assert that no thread suspension is now possible. 1414 const char* last_no_suspend_cause = 1415 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1416 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1417 method_trace_ = method_trace.Get(); 1418 dex_pc_trace_ = dex_pc_trace; 1419 return true; 1420 } 1421 1422 virtual ~BuildInternalStackTraceVisitor() { 1423 if (method_trace_ != nullptr) { 1424 self_->EndAssertNoThreadSuspension(nullptr); 1425 } 1426 } 1427 1428 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1429 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1430 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1431 } 1432 if (skip_depth_ > 0) { 1433 skip_depth_--; 1434 return true; 1435 } 1436 mirror::ArtMethod* m = GetMethod(); 1437 if (m->IsRuntimeMethod()) { 1438 return true; // Ignore runtime frames (in particular callee save). 1439 } 1440 method_trace_->Set<kTransactionActive>(count_, m); 1441 dex_pc_trace_->Set<kTransactionActive>(count_, 1442 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1443 ++count_; 1444 return true; 1445 } 1446 1447 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1448 return method_trace_; 1449 } 1450 1451 private: 1452 Thread* const self_; 1453 // How many more frames to skip. 1454 int32_t skip_depth_; 1455 // Current position down stack trace. 1456 uint32_t count_; 1457 // Array of dex PC values. 1458 mirror::IntArray* dex_pc_trace_; 1459 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1460 mirror::ObjectArray<mirror::Object>* method_trace_; 1461}; 1462 1463template<bool kTransactionActive> 1464jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1465 // Compute depth of stack 1466 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1467 count_visitor.WalkStack(); 1468 int32_t depth = count_visitor.GetDepth(); 1469 int32_t skip_depth = count_visitor.GetSkipDepth(); 1470 1471 // Build internal stack trace. 1472 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1473 const_cast<Thread*>(this), 1474 skip_depth); 1475 if (!build_trace_visitor.Init(depth)) { 1476 return nullptr; // Allocation failed. 1477 } 1478 build_trace_visitor.WalkStack(); 1479 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1480 if (kIsDebugBuild) { 1481 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1482 CHECK(trace->Get(i) != nullptr); 1483 } 1484 } 1485 return soa.AddLocalReference<jobjectArray>(trace); 1486} 1487template jobject Thread::CreateInternalStackTrace<false>( 1488 const ScopedObjectAccessAlreadyRunnable& soa) const; 1489template jobject Thread::CreateInternalStackTrace<true>( 1490 const ScopedObjectAccessAlreadyRunnable& soa) const; 1491 1492jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1493 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1494 int* stack_depth) { 1495 // Decode the internal stack trace into the depth, method trace and PC trace 1496 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1497 1498 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1499 1500 jobjectArray result; 1501 1502 if (output_array != nullptr) { 1503 // Reuse the array we were given. 1504 result = output_array; 1505 // ...adjusting the number of frames we'll write to not exceed the array length. 1506 const int32_t traces_length = 1507 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1508 depth = std::min(depth, traces_length); 1509 } else { 1510 // Create java_trace array and place in local reference table 1511 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1512 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1513 if (java_traces == nullptr) { 1514 return nullptr; 1515 } 1516 result = soa.AddLocalReference<jobjectArray>(java_traces); 1517 } 1518 1519 if (stack_depth != nullptr) { 1520 *stack_depth = depth; 1521 } 1522 1523 for (int32_t i = 0; i < depth; ++i) { 1524 mirror::ObjectArray<mirror::Object>* method_trace = 1525 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1526 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1527 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1528 int32_t line_number; 1529 StackHandleScope<3> hs(soa.Self()); 1530 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1531 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1532 if (method->IsProxyMethod()) { 1533 line_number = -1; 1534 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1535 // source_name_object intentionally left null for proxy methods 1536 } else { 1537 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1538 uint32_t dex_pc = pc_trace->Get(i); 1539 line_number = method->GetLineNumFromDexPC(dex_pc); 1540 // Allocate element, potentially triggering GC 1541 // TODO: reuse class_name_object via Class::name_? 1542 const char* descriptor = method->GetDeclaringClassDescriptor(); 1543 CHECK(descriptor != nullptr); 1544 std::string class_name(PrettyDescriptor(descriptor)); 1545 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1546 if (class_name_object.Get() == nullptr) { 1547 return nullptr; 1548 } 1549 const char* source_file = method->GetDeclaringClassSourceFile(); 1550 if (source_file != nullptr) { 1551 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1552 if (source_name_object.Get() == nullptr) { 1553 return nullptr; 1554 } 1555 } 1556 } 1557 const char* method_name = method->GetName(); 1558 CHECK(method_name != nullptr); 1559 Handle<mirror::String> method_name_object( 1560 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1561 if (method_name_object.Get() == nullptr) { 1562 return nullptr; 1563 } 1564 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1565 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1566 if (obj == nullptr) { 1567 return nullptr; 1568 } 1569 // We are called from native: use non-transactional mode. 1570 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1571 } 1572 return result; 1573} 1574 1575void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1576 const char* exception_class_descriptor, const char* fmt, ...) { 1577 va_list args; 1578 va_start(args, fmt); 1579 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1580 fmt, args); 1581 va_end(args); 1582} 1583 1584void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1585 const char* exception_class_descriptor, 1586 const char* fmt, va_list ap) { 1587 std::string msg; 1588 StringAppendV(&msg, fmt, ap); 1589 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1590} 1591 1592void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1593 const char* msg) { 1594 // Callers should either clear or call ThrowNewWrappedException. 1595 AssertNoPendingExceptionForNewException(msg); 1596 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1597} 1598 1599void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1600 const char* exception_class_descriptor, 1601 const char* msg) { 1602 DCHECK_EQ(this, Thread::Current()); 1603 ScopedObjectAccessUnchecked soa(this); 1604 StackHandleScope<5> hs(soa.Self()); 1605 // Ensure we don't forget arguments over object allocation. 1606 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1607 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1608 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1609 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1610 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1611 ClearException(); 1612 Runtime* runtime = Runtime::Current(); 1613 1614 mirror::ClassLoader* cl = nullptr; 1615 if (saved_throw_method.Get() != nullptr) { 1616 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1617 } 1618 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1619 Handle<mirror::Class> exception_class( 1620 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1621 class_loader))); 1622 if (UNLIKELY(exception_class.Get() == nullptr)) { 1623 CHECK(IsExceptionPending()); 1624 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1625 return; 1626 } 1627 1628 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1629 DCHECK(IsExceptionPending()); 1630 return; 1631 } 1632 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1633 Handle<mirror::Throwable> exception( 1634 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1635 1636 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1637 if (exception.Get() == nullptr) { 1638 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1639 throw_location.GetDexPc()); 1640 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1641 SetExceptionReportedToInstrumentation(is_exception_reported); 1642 return; 1643 } 1644 1645 // Choose an appropriate constructor and set up the arguments. 1646 const char* signature; 1647 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1648 if (msg != nullptr) { 1649 // Ensure we remember this and the method over the String allocation. 1650 msg_string.reset( 1651 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1652 if (UNLIKELY(msg_string.get() == nullptr)) { 1653 CHECK(IsExceptionPending()); // OOME. 1654 return; 1655 } 1656 if (cause.get() == nullptr) { 1657 signature = "(Ljava/lang/String;)V"; 1658 } else { 1659 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1660 } 1661 } else { 1662 if (cause.get() == nullptr) { 1663 signature = "()V"; 1664 } else { 1665 signature = "(Ljava/lang/Throwable;)V"; 1666 } 1667 } 1668 mirror::ArtMethod* exception_init_method = 1669 exception_class->FindDeclaredDirectMethod("<init>", signature); 1670 1671 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1672 << PrettyDescriptor(exception_class_descriptor); 1673 1674 if (UNLIKELY(!runtime->IsStarted())) { 1675 // Something is trying to throw an exception without a started runtime, which is the common 1676 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1677 // the exception fields directly. 1678 if (msg != nullptr) { 1679 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1680 } 1681 if (cause.get() != nullptr) { 1682 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1683 } 1684 ScopedLocalRef<jobject> trace(GetJniEnv(), 1685 Runtime::Current()->IsActiveTransaction() 1686 ? CreateInternalStackTrace<true>(soa) 1687 : CreateInternalStackTrace<false>(soa)); 1688 if (trace.get() != nullptr) { 1689 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1690 } 1691 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1692 throw_location.GetDexPc()); 1693 SetException(gc_safe_throw_location, exception.Get()); 1694 SetExceptionReportedToInstrumentation(is_exception_reported); 1695 } else { 1696 jvalue jv_args[2]; 1697 size_t i = 0; 1698 1699 if (msg != nullptr) { 1700 jv_args[i].l = msg_string.get(); 1701 ++i; 1702 } 1703 if (cause.get() != nullptr) { 1704 jv_args[i].l = cause.get(); 1705 ++i; 1706 } 1707 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1708 if (LIKELY(!IsExceptionPending())) { 1709 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1710 throw_location.GetDexPc()); 1711 SetException(gc_safe_throw_location, exception.Get()); 1712 SetExceptionReportedToInstrumentation(is_exception_reported); 1713 } 1714 } 1715} 1716 1717void Thread::ThrowOutOfMemoryError(const char* msg) { 1718 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1719 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1720 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1721 if (!tls32_.throwing_OutOfMemoryError) { 1722 tls32_.throwing_OutOfMemoryError = true; 1723 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1724 tls32_.throwing_OutOfMemoryError = false; 1725 } else { 1726 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1727 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1728 } 1729} 1730 1731Thread* Thread::CurrentFromGdb() { 1732 return Thread::Current(); 1733} 1734 1735void Thread::DumpFromGdb() const { 1736 std::ostringstream ss; 1737 Dump(ss); 1738 std::string str(ss.str()); 1739 // log to stderr for debugging command line processes 1740 std::cerr << str; 1741#ifdef HAVE_ANDROID_OS 1742 // log to logcat for debugging frameworks processes 1743 LOG(INFO) << str; 1744#endif 1745} 1746 1747// Explicitly instantiate 32 and 64bit thread offset dumping support. 1748template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1749template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1750 1751template<size_t ptr_size> 1752void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1753#define DO_THREAD_OFFSET(x, y) \ 1754 if (offset == x.Uint32Value()) { \ 1755 os << y; \ 1756 return; \ 1757 } 1758 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1759 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1760 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1761 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1762 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1763 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1764 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1765 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1766 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1767 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1768 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1769 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1770 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1771#undef DO_THREAD_OFFSET 1772 1773#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1774 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1775 os << #x; \ 1776 return; \ 1777 } 1778 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1779 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1780#undef INTERPRETER_ENTRY_POINT_INFO 1781 1782#define JNI_ENTRY_POINT_INFO(x) \ 1783 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1784 os << #x; \ 1785 return; \ 1786 } 1787 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1788#undef JNI_ENTRY_POINT_INFO 1789 1790#define PORTABLE_ENTRY_POINT_INFO(x) \ 1791 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1792 os << #x; \ 1793 return; \ 1794 } 1795 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1796 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1797 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1798#undef PORTABLE_ENTRY_POINT_INFO 1799 1800#define QUICK_ENTRY_POINT_INFO(x) \ 1801 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1802 os << #x; \ 1803 return; \ 1804 } 1805 QUICK_ENTRY_POINT_INFO(pAllocArray) 1806 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1807 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1808 QUICK_ENTRY_POINT_INFO(pAllocObject) 1809 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1810 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1811 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1812 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1813 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1814 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1815 QUICK_ENTRY_POINT_INFO(pCheckCast) 1816 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1817 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1818 QUICK_ENTRY_POINT_INFO(pInitializeType) 1819 QUICK_ENTRY_POINT_INFO(pResolveString) 1820 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1821 QUICK_ENTRY_POINT_INFO(pSet32Static) 1822 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1823 QUICK_ENTRY_POINT_INFO(pSet64Static) 1824 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1825 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1826 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1827 QUICK_ENTRY_POINT_INFO(pGet32Static) 1828 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1829 QUICK_ENTRY_POINT_INFO(pGet64Static) 1830 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1831 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1832 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1833 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1834 QUICK_ENTRY_POINT_INFO(pAputObject) 1835 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1836 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1837 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1838 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1839 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1840 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1841 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1842 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1843 QUICK_ENTRY_POINT_INFO(pLockObject) 1844 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1845 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1846 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1847 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1848 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1849 QUICK_ENTRY_POINT_INFO(pFmod) 1850 QUICK_ENTRY_POINT_INFO(pL2d) 1851 QUICK_ENTRY_POINT_INFO(pFmodf) 1852 QUICK_ENTRY_POINT_INFO(pL2f) 1853 QUICK_ENTRY_POINT_INFO(pD2iz) 1854 QUICK_ENTRY_POINT_INFO(pF2iz) 1855 QUICK_ENTRY_POINT_INFO(pIdivmod) 1856 QUICK_ENTRY_POINT_INFO(pD2l) 1857 QUICK_ENTRY_POINT_INFO(pF2l) 1858 QUICK_ENTRY_POINT_INFO(pLdiv) 1859 QUICK_ENTRY_POINT_INFO(pLmod) 1860 QUICK_ENTRY_POINT_INFO(pLmul) 1861 QUICK_ENTRY_POINT_INFO(pShlLong) 1862 QUICK_ENTRY_POINT_INFO(pShrLong) 1863 QUICK_ENTRY_POINT_INFO(pUshrLong) 1864 QUICK_ENTRY_POINT_INFO(pIndexOf) 1865 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1866 QUICK_ENTRY_POINT_INFO(pMemcpy) 1867 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1868 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1869 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1870 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1871 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1872 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1873 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1874 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1875 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1876 QUICK_ENTRY_POINT_INFO(pDeliverException) 1877 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1878 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1879 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1880 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1881 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1882#undef QUICK_ENTRY_POINT_INFO 1883 1884 os << offset; 1885} 1886 1887void Thread::QuickDeliverException() { 1888 // Get exception from thread. 1889 ThrowLocation throw_location; 1890 mirror::Throwable* exception = GetException(&throw_location); 1891 CHECK(exception != nullptr); 1892 // Don't leave exception visible while we try to find the handler, which may cause class 1893 // resolution. 1894 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1895 ClearException(); 1896 bool is_deoptimization = (exception == GetDeoptimizationException()); 1897 QuickExceptionHandler exception_handler(this, is_deoptimization); 1898 if (is_deoptimization) { 1899 exception_handler.DeoptimizeStack(); 1900 } else { 1901 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1902 } 1903 exception_handler.UpdateInstrumentationStack(); 1904 exception_handler.DoLongJump(); 1905 LOG(FATAL) << "UNREACHABLE"; 1906} 1907 1908Context* Thread::GetLongJumpContext() { 1909 Context* result = tlsPtr_.long_jump_context; 1910 if (result == nullptr) { 1911 result = Context::Create(); 1912 } else { 1913 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1914 result->Reset(); 1915 } 1916 return result; 1917} 1918 1919struct CurrentMethodVisitor FINAL : public StackVisitor { 1920 CurrentMethodVisitor(Thread* thread, Context* context) 1921 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1922 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1923 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1924 mirror::ArtMethod* m = GetMethod(); 1925 if (m->IsRuntimeMethod()) { 1926 // Continue if this is a runtime method. 1927 return true; 1928 } 1929 if (context_ != nullptr) { 1930 this_object_ = GetThisObject(); 1931 } 1932 method_ = m; 1933 dex_pc_ = GetDexPc(); 1934 return false; 1935 } 1936 mirror::Object* this_object_; 1937 mirror::ArtMethod* method_; 1938 uint32_t dex_pc_; 1939}; 1940 1941mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1942 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1943 visitor.WalkStack(false); 1944 if (dex_pc != nullptr) { 1945 *dex_pc = visitor.dex_pc_; 1946 } 1947 return visitor.method_; 1948} 1949 1950ThrowLocation Thread::GetCurrentLocationForThrow() { 1951 Context* context = GetLongJumpContext(); 1952 CurrentMethodVisitor visitor(this, context); 1953 visitor.WalkStack(false); 1954 ReleaseLongJumpContext(context); 1955 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1956} 1957 1958bool Thread::HoldsLock(mirror::Object* object) const { 1959 if (object == nullptr) { 1960 return false; 1961 } 1962 return object->GetLockOwnerThreadId() == GetThreadId(); 1963} 1964 1965// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1966template <typename RootVisitor> 1967class ReferenceMapVisitor : public StackVisitor { 1968 public: 1969 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1970 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1971 : StackVisitor(thread, context), visitor_(visitor) {} 1972 1973 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1974 if (false) { 1975 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1976 << StringPrintf("@ PC:%04x", GetDexPc()); 1977 } 1978 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1979 if (shadow_frame != nullptr) { 1980 VisitShadowFrame(shadow_frame); 1981 } else { 1982 VisitQuickFrame(); 1983 } 1984 return true; 1985 } 1986 1987 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1988 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 1989 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 1990 mirror::ArtMethod* m = *method_addr; 1991 DCHECK(m != nullptr); 1992 size_t num_regs = shadow_frame->NumberOfVRegs(); 1993 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1994 // handle scope for JNI or References for interpreter. 1995 for (size_t reg = 0; reg < num_regs; ++reg) { 1996 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1997 if (ref != nullptr) { 1998 mirror::Object* new_ref = ref; 1999 visitor_(&new_ref, reg, this); 2000 if (new_ref != ref) { 2001 shadow_frame->SetVRegReference(reg, new_ref); 2002 } 2003 } 2004 } 2005 } else { 2006 // Java method. 2007 // Portable path use DexGcMap and store in Method.native_gc_map_. 2008 const uint8_t* gc_map = m->GetNativeGcMap(); 2009 CHECK(gc_map != nullptr) << PrettyMethod(m); 2010 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2011 uint32_t dex_pc = shadow_frame->GetDexPC(); 2012 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2013 DCHECK(reg_bitmap != nullptr); 2014 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2015 for (size_t reg = 0; reg < num_regs; ++reg) { 2016 if (TestBitmap(reg, reg_bitmap)) { 2017 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2018 if (ref != nullptr) { 2019 mirror::Object* new_ref = ref; 2020 visitor_(&new_ref, reg, this); 2021 if (new_ref != ref) { 2022 shadow_frame->SetVRegReference(reg, new_ref); 2023 } 2024 } 2025 } 2026 } 2027 } 2028 } 2029 2030 private: 2031 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2032 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2033 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2034 mirror::ArtMethod* old_method = m; 2035 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2036 if (m != old_method) { 2037 cur_quick_frame->Assign(m); 2038 } 2039 2040 // Process register map (which native and runtime methods don't have) 2041 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2042 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2043 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2044 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2045 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2046 NativePcOffsetToReferenceMap map(native_gc_map); 2047 size_t num_regs = std::min(map.RegWidth() * 8, 2048 static_cast<size_t>(code_item->registers_size_)); 2049 if (num_regs > 0) { 2050 Runtime* runtime = Runtime::Current(); 2051 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2052 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2053 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2054 DCHECK(reg_bitmap != nullptr); 2055 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2056 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2057 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2058 // For all dex registers in the bitmap 2059 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2060 DCHECK(cur_quick_frame != nullptr); 2061 for (size_t reg = 0; reg < num_regs; ++reg) { 2062 // Does this register hold a reference? 2063 if (TestBitmap(reg, reg_bitmap)) { 2064 uint32_t vmap_offset; 2065 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2066 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2067 kReferenceVReg); 2068 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2069 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2070 if (*ref_addr != nullptr) { 2071 visitor_(ref_addr, reg, this); 2072 } 2073 } else { 2074 StackReference<mirror::Object>* ref_addr = 2075 reinterpret_cast<StackReference<mirror::Object>*>( 2076 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2077 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2078 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2079 if (ref != nullptr) { 2080 mirror::Object* new_ref = ref; 2081 visitor_(&new_ref, reg, this); 2082 if (ref != new_ref) { 2083 ref_addr->Assign(new_ref); 2084 } 2085 } 2086 } 2087 } 2088 } 2089 } 2090 } 2091 } 2092 2093 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2094 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2095 } 2096 2097 // Visitor for when we visit a root. 2098 const RootVisitor& visitor_; 2099}; 2100 2101class RootCallbackVisitor { 2102 public: 2103 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2104 : callback_(callback), arg_(arg), tid_(tid) {} 2105 2106 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2107 callback_(obj, arg_, tid_, kRootJavaFrame); 2108 } 2109 2110 private: 2111 RootCallback* const callback_; 2112 void* const arg_; 2113 const uint32_t tid_; 2114}; 2115 2116void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2117 VerifyObject(class_loader_override); 2118 tlsPtr_.class_loader_override = class_loader_override; 2119} 2120 2121void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2122 uint32_t thread_id = GetThreadId(); 2123 if (tlsPtr_.opeer != nullptr) { 2124 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2125 } 2126 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2127 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2128 } 2129 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2130 if (tlsPtr_.class_loader_override != nullptr) { 2131 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, thread_id, 2132 kRootNativeStack); 2133 } 2134 if (tlsPtr_.monitor_enter_object != nullptr) { 2135 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2136 } 2137 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2138 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2139 HandleScopeVisitRoots(visitor, arg, thread_id); 2140 if (tlsPtr_.debug_invoke_req != nullptr) { 2141 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2142 } 2143 if (tlsPtr_.single_step_control != nullptr) { 2144 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2145 } 2146 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2147 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2148 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2149 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2150 shadow_frame = shadow_frame->GetLink()) { 2151 mapper.VisitShadowFrame(shadow_frame); 2152 } 2153 } 2154 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2155 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2156 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2157 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2158 shadow_frame != nullptr; 2159 shadow_frame = shadow_frame->GetLink()) { 2160 mapper.VisitShadowFrame(shadow_frame); 2161 } 2162 } 2163 // Visit roots on this thread's stack 2164 Context* context = GetLongJumpContext(); 2165 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2166 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2167 mapper.WalkStack(); 2168 ReleaseLongJumpContext(context); 2169 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2170 if (frame.this_object_ != nullptr) { 2171 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2172 } 2173 DCHECK(frame.method_ != nullptr); 2174 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2175 } 2176} 2177 2178static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2179 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2180 VerifyObject(*root); 2181} 2182 2183void Thread::VerifyStackImpl() { 2184 std::unique_ptr<Context> context(Context::Create()); 2185 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2186 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2187 mapper.WalkStack(); 2188} 2189 2190// Set the stack end to that to be used during a stack overflow 2191void Thread::SetStackEndForStackOverflow() { 2192 // During stack overflow we allow use of the full stack. 2193 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2194 // However, we seem to have already extended to use the full stack. 2195 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2196 << kRuntimeStackOverflowReservedBytes << ")?"; 2197 DumpStack(LOG(ERROR)); 2198 LOG(FATAL) << "Recursive stack overflow."; 2199 } 2200 2201 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2202} 2203 2204void Thread::SetTlab(byte* start, byte* end) { 2205 DCHECK_LE(start, end); 2206 tlsPtr_.thread_local_start = start; 2207 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2208 tlsPtr_.thread_local_end = end; 2209 tlsPtr_.thread_local_objects = 0; 2210} 2211 2212bool Thread::HasTlab() const { 2213 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2214 if (has_tlab) { 2215 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2216 } else { 2217 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2218 } 2219 return has_tlab; 2220} 2221 2222std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2223 thread.ShortDump(os); 2224 return os; 2225} 2226 2227} // namespace art 2228