thread.cc revision 986c6fbb5f65006165f8b7fed1fd105fb3a83bd9
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-inl.h" 36#include "class_linker.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-inl.h" 47#include "handle_scope.h" 48#include "indirect_reference_table-inl.h" 49#include "jni_internal.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class_loader.h" 53#include "mirror/class-inl.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/stack_trace_element.h" 56#include "monitor.h" 57#include "object_lock.h" 58#include "quick_exception_handler.h" 59#include "quick/quick_method_frame_info.h" 60#include "reflection.h" 61#include "runtime.h" 62#include "scoped_thread_state_change.h" 63#include "ScopedLocalRef.h" 64#include "ScopedUtfChars.h" 65#include "stack.h" 66#include "thread_list.h" 67#include "thread-inl.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; 79const size_t Thread::kStackOverflowImplicitCheckSize = GetStackOverflowReservedBytes(kRuntimeISA); 80 81static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 82 83void Thread::InitCardTable() { 84 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 85} 86 87static void UnimplementedEntryPoint() { 88 UNIMPLEMENTED(FATAL); 89} 90 91void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 92 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 93 94void Thread::InitTlsEntryPoints() { 95 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 96 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 97 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + 98 sizeof(tlsPtr_.quick_entrypoints)); 99 for (uintptr_t* it = begin; it != end; ++it) { 100 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 101 } 102 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 103 &tlsPtr_.portable_entrypoints, &tlsPtr_.quick_entrypoints); 104} 105 106void Thread::ResetQuickAllocEntryPointsForThread() { 107 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 108} 109 110void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 111 tlsPtr_.deoptimization_shadow_frame = sf; 112} 113 114void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 115 tls64_.deoptimization_return_value.SetJ(ret_val.GetJ()); 116} 117 118ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 119 ShadowFrame* sf = tlsPtr_.deoptimization_shadow_frame; 120 tlsPtr_.deoptimization_shadow_frame = nullptr; 121 ret_val->SetJ(tls64_.deoptimization_return_value.GetJ()); 122 return sf; 123} 124 125void Thread::SetShadowFrameUnderConstruction(ShadowFrame* sf) { 126 sf->SetLink(tlsPtr_.shadow_frame_under_construction); 127 tlsPtr_.shadow_frame_under_construction = sf; 128} 129 130void Thread::ClearShadowFrameUnderConstruction() { 131 CHECK_NE(static_cast<ShadowFrame*>(nullptr), tlsPtr_.shadow_frame_under_construction); 132 tlsPtr_.shadow_frame_under_construction = tlsPtr_.shadow_frame_under_construction->GetLink(); 133} 134 135void Thread::InitTid() { 136 tls32_.tid = ::art::GetTid(); 137} 138 139void Thread::InitAfterFork() { 140 // One thread (us) survived the fork, but we have a new tid so we need to 141 // update the value stashed in this Thread*. 142 InitTid(); 143} 144 145void* Thread::CreateCallback(void* arg) { 146 Thread* self = reinterpret_cast<Thread*>(arg); 147 Runtime* runtime = Runtime::Current(); 148 if (runtime == nullptr) { 149 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 150 return nullptr; 151 } 152 { 153 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 154 // after self->Init(). 155 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 156 // Check that if we got here we cannot be shutting down (as shutdown should never have started 157 // while threads are being born). 158 CHECK(!runtime->IsShuttingDownLocked()); 159 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 160 Runtime::Current()->EndThreadBirth(); 161 } 162 { 163 ScopedObjectAccess soa(self); 164 165 // Copy peer into self, deleting global reference when done. 166 CHECK(self->tlsPtr_.jpeer != nullptr); 167 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 168 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 169 self->tlsPtr_.jpeer = nullptr; 170 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 171 Dbg::PostThreadStart(self); 172 173 // Invoke the 'run' method of our java.lang.Thread. 174 mirror::Object* receiver = self->tlsPtr_.opeer; 175 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 176 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 177 } 178 // Detach and delete self. 179 Runtime::Current()->GetThreadList()->Unregister(self); 180 181 return nullptr; 182} 183 184Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 185 mirror::Object* thread_peer) { 186 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 187 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 188 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 189 // to stop it from going away. 190 if (kIsDebugBuild) { 191 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 192 if (result != nullptr && !result->IsSuspended()) { 193 Locks::thread_list_lock_->AssertHeld(soa.Self()); 194 } 195 } 196 return result; 197} 198 199Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 200 jobject java_thread) { 201 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 202} 203 204static size_t FixStackSize(size_t stack_size) { 205 // A stack size of zero means "use the default". 206 if (stack_size == 0) { 207 stack_size = Runtime::Current()->GetDefaultStackSize(); 208 } 209 210 // Dalvik used the bionic pthread default stack size for native threads, 211 // so include that here to support apps that expect large native stacks. 212 stack_size += 1 * MB; 213 214 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 215 if (stack_size < PTHREAD_STACK_MIN) { 216 stack_size = PTHREAD_STACK_MIN; 217 } 218 219 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 220 // It's likely that callers are trying to ensure they have at least a certain amount of 221 // stack space, so we should add our reserved space on top of what they requested, rather 222 // than implicitly take it away from them. 223 stack_size += GetStackOverflowReservedBytes(kRuntimeISA); 224 } else { 225 // If we are going to use implicit stack checks, allocate space for the protected 226 // region at the bottom of the stack. 227 stack_size += Thread::kStackOverflowImplicitCheckSize + 228 GetStackOverflowReservedBytes(kRuntimeISA); 229 } 230 231 // Some systems require the stack size to be a multiple of the system page size, so round up. 232 stack_size = RoundUp(stack_size, kPageSize); 233 234 return stack_size; 235} 236 237// Global variable to prevent the compiler optimizing away the page reads for the stack. 238uint8_t dont_optimize_this; 239 240// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 241// overflow is detected. It is located right below the stack_begin_. 242// 243// There is a little complexity here that deserves a special mention. On some 244// architectures, the stack created using a VM_GROWSDOWN flag 245// to prevent memory being allocated when it's not needed. This flag makes the 246// kernel only allocate memory for the stack by growing down in memory. Because we 247// want to put an mprotected region far away from that at the stack top, we need 248// to make sure the pages for the stack are mapped in before we call mprotect. We do 249// this by reading every page from the stack bottom (highest address) to the stack top. 250// We then madvise this away. 251void Thread::InstallImplicitProtection() { 252 uint8_t* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 253 uint8_t* stack_himem = tlsPtr_.stack_end; 254 uint8_t* stack_top = reinterpret_cast<uint8_t*>(reinterpret_cast<uintptr_t>(&stack_himem) & 255 ~(kPageSize - 1)); // Page containing current top of stack. 256 257 // First remove the protection on the protected region as will want to read and 258 // write it. This may fail (on the first attempt when the stack is not mapped) 259 // but we ignore that. 260 UnprotectStack(); 261 262 // Map in the stack. This must be done by reading from the 263 // current stack pointer downwards as the stack may be mapped using VM_GROWSDOWN 264 // in the kernel. Any access more than a page below the current SP might cause 265 // a segv. 266 267 // Read every page from the high address to the low. 268 for (uint8_t* p = stack_top; p >= pregion; p -= kPageSize) { 269 dont_optimize_this = *p; 270 } 271 272 VLOG(threads) << "installing stack protected region at " << std::hex << 273 static_cast<void*>(pregion) << " to " << 274 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 275 276 // Protect the bottom of the stack to prevent read/write to it. 277 ProtectStack(); 278 279 // Tell the kernel that we won't be needing these pages any more. 280 // NB. madvise will probably write zeroes into the memory (on linux it does). 281 uint32_t unwanted_size = stack_top - pregion - kPageSize; 282 madvise(pregion, unwanted_size, MADV_DONTNEED); 283} 284 285void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 286 CHECK(java_peer != nullptr); 287 Thread* self = static_cast<JNIEnvExt*>(env)->self; 288 Runtime* runtime = Runtime::Current(); 289 290 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 291 bool thread_start_during_shutdown = false; 292 { 293 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 294 if (runtime->IsShuttingDownLocked()) { 295 thread_start_during_shutdown = true; 296 } else { 297 runtime->StartThreadBirth(); 298 } 299 } 300 if (thread_start_during_shutdown) { 301 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 302 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 303 return; 304 } 305 306 Thread* child_thread = new Thread(is_daemon); 307 // Use global JNI ref to hold peer live while child thread starts. 308 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 309 stack_size = FixStackSize(stack_size); 310 311 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 312 // assign it. 313 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 314 reinterpret_cast<jlong>(child_thread)); 315 316 pthread_t new_pthread; 317 pthread_attr_t attr; 318 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 319 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 320 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 321 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 322 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 323 324 if (pthread_create_result != 0) { 325 // pthread_create(3) failed, so clean up. 326 { 327 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 328 runtime->EndThreadBirth(); 329 } 330 // Manually delete the global reference since Thread::Init will not have been run. 331 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 332 child_thread->tlsPtr_.jpeer = nullptr; 333 delete child_thread; 334 child_thread = nullptr; 335 // TODO: remove from thread group? 336 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 337 { 338 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 339 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 340 ScopedObjectAccess soa(env); 341 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 342 } 343 } 344} 345 346void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 347 // This function does all the initialization that must be run by the native thread it applies to. 348 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 349 // we can handshake with the corresponding native thread when it's ready.) Check this native 350 // thread hasn't been through here already... 351 CHECK(Thread::Current() == nullptr); 352 SetUpAlternateSignalStack(); 353 InitCpu(); 354 InitTlsEntryPoints(); 355 RemoveSuspendTrigger(); 356 InitCardTable(); 357 InitTid(); 358 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 359 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 360 tlsPtr_.pthread_self = pthread_self(); 361 CHECK(is_started_); 362 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 363 DCHECK_EQ(Thread::Current(), this); 364 365 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 366 InitStackHwm(); 367 368 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 369 thread_list->Register(this); 370} 371 372Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 373 bool create_peer) { 374 Thread* self; 375 Runtime* runtime = Runtime::Current(); 376 if (runtime == nullptr) { 377 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 378 return nullptr; 379 } 380 { 381 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 382 if (runtime->IsShuttingDownLocked()) { 383 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 384 return nullptr; 385 } else { 386 Runtime::Current()->StartThreadBirth(); 387 self = new Thread(as_daemon); 388 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 389 Runtime::Current()->EndThreadBirth(); 390 } 391 } 392 393 CHECK_NE(self->GetState(), kRunnable); 394 self->SetState(kNative); 395 396 // If we're the main thread, ClassLinker won't be created until after we're attached, 397 // so that thread needs a two-stage attach. Regular threads don't need this hack. 398 // In the compiler, all threads need this hack, because no-one's going to be getting 399 // a native peer! 400 if (create_peer) { 401 self->CreatePeer(thread_name, as_daemon, thread_group); 402 } else { 403 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 404 if (thread_name != nullptr) { 405 self->tlsPtr_.name->assign(thread_name); 406 ::art::SetThreadName(thread_name); 407 } else if (self->GetJniEnv()->check_jni) { 408 LOG(WARNING) << *Thread::Current() << " attached without supplying a name"; 409 } 410 } 411 412 return self; 413} 414 415void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 416 Runtime* runtime = Runtime::Current(); 417 CHECK(runtime->IsStarted()); 418 JNIEnv* env = tlsPtr_.jni_env; 419 420 if (thread_group == nullptr) { 421 thread_group = runtime->GetMainThreadGroup(); 422 } 423 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 424 jint thread_priority = GetNativePriority(); 425 jboolean thread_is_daemon = as_daemon; 426 427 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 428 if (peer.get() == nullptr) { 429 CHECK(IsExceptionPending()); 430 return; 431 } 432 { 433 ScopedObjectAccess soa(this); 434 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 435 } 436 env->CallNonvirtualVoidMethod(peer.get(), 437 WellKnownClasses::java_lang_Thread, 438 WellKnownClasses::java_lang_Thread_init, 439 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 440 AssertNoPendingException(); 441 442 Thread* self = this; 443 DCHECK_EQ(self, Thread::Current()); 444 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 445 reinterpret_cast<jlong>(self)); 446 447 ScopedObjectAccess soa(self); 448 StackHandleScope<1> hs(self); 449 MutableHandle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 450 if (peer_thread_name.Get() == nullptr) { 451 // The Thread constructor should have set the Thread.name to a 452 // non-null value. However, because we can run without code 453 // available (in the compiler, in tests), we manually assign the 454 // fields the constructor should have set. 455 if (runtime->IsActiveTransaction()) { 456 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 457 } else { 458 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 459 } 460 peer_thread_name.Assign(GetThreadName(soa)); 461 } 462 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 463 if (peer_thread_name.Get() != nullptr) { 464 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 465 } 466} 467 468template<bool kTransactionActive> 469void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 470 jobject thread_name, jint thread_priority) { 471 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 472 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 473 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 474 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 475 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 476 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 477 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 478 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 479} 480 481void Thread::SetThreadName(const char* name) { 482 tlsPtr_.name->assign(name); 483 ::art::SetThreadName(name); 484 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 485} 486 487void Thread::InitStackHwm() { 488 void* read_stack_base; 489 size_t read_stack_size; 490 size_t read_guard_size; 491 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size, &read_guard_size); 492 493 // This is included in the SIGQUIT output, but it's useful here for thread debugging. 494 VLOG(threads) << StringPrintf("Native stack is at %p (%s with %s guard)", 495 read_stack_base, 496 PrettySize(read_stack_size).c_str(), 497 PrettySize(read_guard_size).c_str()); 498 499 tlsPtr_.stack_begin = reinterpret_cast<uint8_t*>(read_stack_base); 500 tlsPtr_.stack_size = read_stack_size; 501 502 // The minimum stack size we can cope with is the overflow reserved bytes (typically 503 // 8K) + the protected region size (4K) + another page (4K). Typically this will 504 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 505 // between 8K and 12K. 506 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 507 + 4 * KB; 508 if (read_stack_size <= min_stack) { 509 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 510 << " bytes)"; 511 } 512 513 // Set stack_end_ to the bottom of the stack saving space of stack overflows 514 515 Runtime* runtime = Runtime::Current(); 516 bool implicit_stack_check = !runtime->ExplicitStackOverflowChecks() && !runtime->IsCompiler(); 517 ResetDefaultStackEnd(); 518 519 // Install the protected region if we are doing implicit overflow checks. 520 if (implicit_stack_check) { 521 // The thread might have protected region at the bottom. We need 522 // to install our own region so we need to move the limits 523 // of the stack to make room for it. 524 525 tlsPtr_.stack_begin += read_guard_size + kStackOverflowProtectedSize; 526 tlsPtr_.stack_end += read_guard_size + kStackOverflowProtectedSize; 527 tlsPtr_.stack_size -= read_guard_size; 528 529 InstallImplicitProtection(); 530 } 531 532 // Sanity check. 533 int stack_variable; 534 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 535} 536 537void Thread::ShortDump(std::ostream& os) const { 538 os << "Thread["; 539 if (GetThreadId() != 0) { 540 // If we're in kStarting, we won't have a thin lock id or tid yet. 541 os << GetThreadId() 542 << ",tid=" << GetTid() << ','; 543 } 544 os << GetState() 545 << ",Thread*=" << this 546 << ",peer=" << tlsPtr_.opeer 547 << ",\"" << *tlsPtr_.name << "\"" 548 << "]"; 549} 550 551void Thread::Dump(std::ostream& os) const { 552 DumpState(os); 553 DumpStack(os); 554} 555 556mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 557 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 558 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 559} 560 561void Thread::GetThreadName(std::string& name) const { 562 name.assign(*tlsPtr_.name); 563} 564 565uint64_t Thread::GetCpuMicroTime() const { 566#if defined(HAVE_POSIX_CLOCKS) 567 clockid_t cpu_clock_id; 568 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 569 timespec now; 570 clock_gettime(cpu_clock_id, &now); 571 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 572#else 573 UNIMPLEMENTED(WARNING); 574 return -1; 575#endif 576} 577 578// Attempt to rectify locks so that we dump thread list with required locks before exiting. 579static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 580 LOG(ERROR) << *thread << " suspend count already zero."; 581 Locks::thread_suspend_count_lock_->Unlock(self); 582 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 583 Locks::mutator_lock_->SharedTryLock(self); 584 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 585 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 586 } 587 } 588 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 589 Locks::thread_list_lock_->TryLock(self); 590 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 591 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 592 } 593 } 594 std::ostringstream ss; 595 Runtime::Current()->GetThreadList()->Dump(ss); 596 LOG(FATAL) << ss.str(); 597} 598 599void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 600 if (kIsDebugBuild) { 601 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 602 << delta << " " << tls32_.debug_suspend_count << " " << this; 603 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 604 Locks::thread_suspend_count_lock_->AssertHeld(self); 605 if (this != self && !IsSuspended()) { 606 Locks::thread_list_lock_->AssertHeld(self); 607 } 608 } 609 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 610 UnsafeLogFatalForSuspendCount(self, this); 611 return; 612 } 613 614 tls32_.suspend_count += delta; 615 if (for_debugger) { 616 tls32_.debug_suspend_count += delta; 617 } 618 619 if (tls32_.suspend_count == 0) { 620 AtomicClearFlag(kSuspendRequest); 621 } else { 622 AtomicSetFlag(kSuspendRequest); 623 TriggerSuspend(); 624 } 625} 626 627void Thread::RunCheckpointFunction() { 628 Closure *checkpoints[kMaxCheckpoints]; 629 630 // Grab the suspend_count lock and copy the current set of 631 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 632 // function will also grab this lock so we prevent a race between setting 633 // the kCheckpointRequest flag and clearing it. 634 { 635 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 636 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 637 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 638 tlsPtr_.checkpoint_functions[i] = nullptr; 639 } 640 AtomicClearFlag(kCheckpointRequest); 641 } 642 643 // Outside the lock, run all the checkpoint functions that 644 // we collected. 645 bool found_checkpoint = false; 646 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 647 if (checkpoints[i] != nullptr) { 648 ATRACE_BEGIN("Checkpoint function"); 649 checkpoints[i]->Run(this); 650 ATRACE_END(); 651 found_checkpoint = true; 652 } 653 } 654 CHECK(found_checkpoint); 655} 656 657bool Thread::RequestCheckpoint(Closure* function) { 658 union StateAndFlags old_state_and_flags; 659 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 660 if (old_state_and_flags.as_struct.state != kRunnable) { 661 return false; // Fail, thread is suspended and so can't run a checkpoint. 662 } 663 664 uint32_t available_checkpoint = kMaxCheckpoints; 665 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 666 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 667 available_checkpoint = i; 668 break; 669 } 670 } 671 if (available_checkpoint == kMaxCheckpoints) { 672 // No checkpoint functions available, we can't run a checkpoint 673 return false; 674 } 675 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 676 677 // Checkpoint function installed now install flag bit. 678 // We must be runnable to request a checkpoint. 679 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 680 union StateAndFlags new_state_and_flags; 681 new_state_and_flags.as_int = old_state_and_flags.as_int; 682 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 683 bool success = 684 tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent(old_state_and_flags.as_int, 685 new_state_and_flags.as_int); 686 if (UNLIKELY(!success)) { 687 // The thread changed state before the checkpoint was installed. 688 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 689 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 690 } else { 691 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 692 TriggerSuspend(); 693 } 694 return success; 695} 696 697void Thread::FullSuspendCheck() { 698 VLOG(threads) << this << " self-suspending"; 699 ATRACE_BEGIN("Full suspend check"); 700 // Make thread appear suspended to other threads, release mutator_lock_. 701 TransitionFromRunnableToSuspended(kSuspended); 702 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 703 TransitionFromSuspendedToRunnable(); 704 ATRACE_END(); 705 VLOG(threads) << this << " self-reviving"; 706} 707 708void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 709 std::string group_name; 710 int priority; 711 bool is_daemon = false; 712 Thread* self = Thread::Current(); 713 714 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 715 // cause ScopedObjectAccessUnchecked to deadlock. 716 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 717 ScopedObjectAccessUnchecked soa(self); 718 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 719 ->GetInt(thread->tlsPtr_.opeer); 720 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 721 ->GetBoolean(thread->tlsPtr_.opeer); 722 723 mirror::Object* thread_group = 724 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 725 726 if (thread_group != nullptr) { 727 mirror::ArtField* group_name_field = 728 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 729 mirror::String* group_name_string = 730 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 731 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 732 } 733 } else { 734 priority = GetNativePriority(); 735 } 736 737 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 738 if (scheduler_group_name.empty()) { 739 scheduler_group_name = "default"; 740 } 741 742 if (thread != nullptr) { 743 os << '"' << *thread->tlsPtr_.name << '"'; 744 if (is_daemon) { 745 os << " daemon"; 746 } 747 os << " prio=" << priority 748 << " tid=" << thread->GetThreadId() 749 << " " << thread->GetState(); 750 if (thread->IsStillStarting()) { 751 os << " (still starting up)"; 752 } 753 os << "\n"; 754 } else { 755 os << '"' << ::art::GetThreadName(tid) << '"' 756 << " prio=" << priority 757 << " (not attached)\n"; 758 } 759 760 if (thread != nullptr) { 761 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 762 os << " | group=\"" << group_name << "\"" 763 << " sCount=" << thread->tls32_.suspend_count 764 << " dsCount=" << thread->tls32_.debug_suspend_count 765 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 766 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 767 } 768 769 os << " | sysTid=" << tid 770 << " nice=" << getpriority(PRIO_PROCESS, tid) 771 << " cgrp=" << scheduler_group_name; 772 if (thread != nullptr) { 773 int policy; 774 sched_param sp; 775 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 776 __FUNCTION__); 777 os << " sched=" << policy << "/" << sp.sched_priority 778 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 779 } 780 os << "\n"; 781 782 // Grab the scheduler stats for this thread. 783 std::string scheduler_stats; 784 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 785 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 786 } else { 787 scheduler_stats = "0 0 0"; 788 } 789 790 char native_thread_state = '?'; 791 int utime = 0; 792 int stime = 0; 793 int task_cpu = 0; 794 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 795 796 os << " | state=" << native_thread_state 797 << " schedstat=( " << scheduler_stats << " )" 798 << " utm=" << utime 799 << " stm=" << stime 800 << " core=" << task_cpu 801 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 802 if (thread != nullptr) { 803 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 804 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 805 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 806 // Dump the held mutexes. 807 os << " | held mutexes="; 808 for (size_t i = 0; i < kLockLevelCount; ++i) { 809 if (i != kMonitorLock) { 810 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 811 if (mutex != nullptr) { 812 os << " \"" << mutex->GetName() << "\""; 813 if (mutex->IsReaderWriterMutex()) { 814 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 815 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 816 os << "(exclusive held)"; 817 } else { 818 os << "(shared held)"; 819 } 820 } 821 } 822 } 823 } 824 os << "\n"; 825 } 826} 827 828void Thread::DumpState(std::ostream& os) const { 829 Thread::DumpState(os, this, GetTid()); 830} 831 832struct StackDumpVisitor : public StackVisitor { 833 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 834 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 835 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 836 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 837 } 838 839 virtual ~StackDumpVisitor() { 840 if (frame_count == 0) { 841 os << " (no managed stack frames)\n"; 842 } 843 } 844 845 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 846 mirror::ArtMethod* m = GetMethod(); 847 if (m->IsRuntimeMethod()) { 848 return true; 849 } 850 const int kMaxRepetition = 3; 851 mirror::Class* c = m->GetDeclaringClass(); 852 mirror::DexCache* dex_cache = c->GetDexCache(); 853 int line_number = -1; 854 if (dex_cache != nullptr) { // be tolerant of bad input 855 const DexFile& dex_file = *dex_cache->GetDexFile(); 856 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 857 } 858 if (line_number == last_line_number && last_method == m) { 859 ++repetition_count; 860 } else { 861 if (repetition_count >= kMaxRepetition) { 862 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 863 } 864 repetition_count = 0; 865 last_line_number = line_number; 866 last_method = m; 867 } 868 if (repetition_count < kMaxRepetition) { 869 os << " at " << PrettyMethod(m, false); 870 if (m->IsNative()) { 871 os << "(Native method)"; 872 } else { 873 const char* source_file(m->GetDeclaringClassSourceFile()); 874 os << "(" << (source_file != nullptr ? source_file : "unavailable") 875 << ":" << line_number << ")"; 876 } 877 os << "\n"; 878 if (frame_count == 0) { 879 Monitor::DescribeWait(os, thread); 880 } 881 if (can_allocate) { 882 // Visit locks, but do not abort on errors. This would trigger a nested abort. 883 Monitor::VisitLocks(this, DumpLockedObject, &os, false); 884 } 885 } 886 887 ++frame_count; 888 return true; 889 } 890 891 static void DumpLockedObject(mirror::Object* o, void* context) 892 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 893 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 894 os << " - locked "; 895 if (o == nullptr) { 896 os << "an unknown object"; 897 } else { 898 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 899 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 900 // Getting the identity hashcode here would result in lock inflation and suspension of the 901 // current thread, which isn't safe if this is the only runnable thread. 902 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 903 PrettyTypeOf(o).c_str()); 904 } else { 905 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 906 } 907 } 908 os << "\n"; 909 } 910 911 std::ostream& os; 912 const Thread* thread; 913 const bool can_allocate; 914 mirror::ArtMethod* last_method; 915 int last_line_number; 916 int repetition_count; 917 int frame_count; 918}; 919 920static bool ShouldShowNativeStack(const Thread* thread) 921 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 922 ThreadState state = thread->GetState(); 923 924 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 925 if (state > kWaiting && state < kStarting) { 926 return true; 927 } 928 929 // In an Object.wait variant or Thread.sleep? That's not interesting. 930 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 931 return false; 932 } 933 934 // Threads with no managed stack frames should be shown. 935 const ManagedStack* managed_stack = thread->GetManagedStack(); 936 if (managed_stack == NULL || (managed_stack->GetTopQuickFrame() == NULL && 937 managed_stack->GetTopShadowFrame() == NULL)) { 938 return true; 939 } 940 941 // In some other native method? That's interesting. 942 // We don't just check kNative because native methods will be in state kSuspended if they're 943 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 944 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 945 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 946 return current_method != nullptr && current_method->IsNative(); 947} 948 949void Thread::DumpJavaStack(std::ostream& os) const { 950 // Dumping the Java stack involves the verifier for locks. The verifier operates under the 951 // assumption that there is no exception pending on entry. Thus, stash any pending exception. 952 // TODO: Find a way to avoid const_cast. 953 StackHandleScope<1> scope(const_cast<Thread*>(this)); 954 Handle<mirror::Throwable> exc; 955 ThrowLocation exc_location; 956 bool have_exception = false; 957 if (IsExceptionPending()) { 958 exc = scope.NewHandle(GetException(&exc_location)); 959 const_cast<Thread*>(this)->ClearException(); 960 have_exception = true; 961 } 962 963 std::unique_ptr<Context> context(Context::Create()); 964 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 965 !tls32_.throwing_OutOfMemoryError); 966 dumper.WalkStack(); 967 968 if (have_exception) { 969 const_cast<Thread*>(this)->SetException(exc_location, exc.Get()); 970 } 971} 972 973void Thread::DumpStack(std::ostream& os) const { 974 // TODO: we call this code when dying but may not have suspended the thread ourself. The 975 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 976 // the race with the thread_suspend_count_lock_). 977 bool dump_for_abort = (gAborting > 0); 978 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 979 if (!kIsDebugBuild) { 980 // We always want to dump the stack for an abort, however, there is no point dumping another 981 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 982 safe_to_dump = (safe_to_dump || dump_for_abort); 983 } 984 if (safe_to_dump) { 985 // If we're currently in native code, dump that stack before dumping the managed stack. 986 if (dump_for_abort || ShouldShowNativeStack(this)) { 987 DumpKernelStack(os, GetTid(), " kernel: ", false); 988 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr, !dump_for_abort)); 989 } 990 DumpJavaStack(os); 991 } else { 992 os << "Not able to dump stack of thread that isn't suspended"; 993 } 994} 995 996void Thread::ThreadExitCallback(void* arg) { 997 Thread* self = reinterpret_cast<Thread*>(arg); 998 if (self->tls32_.thread_exit_check_count == 0) { 999 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1000 "going to use a pthread_key_create destructor?): " << *self; 1001 CHECK(is_started_); 1002 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1003 self->tls32_.thread_exit_check_count = 1; 1004 } else { 1005 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1006 } 1007} 1008 1009void Thread::Startup() { 1010 CHECK(!is_started_); 1011 is_started_ = true; 1012 { 1013 // MutexLock to keep annotalysis happy. 1014 // 1015 // Note we use nullptr for the thread because Thread::Current can 1016 // return garbage since (is_started_ == true) and 1017 // Thread::pthread_key_self_ is not yet initialized. 1018 // This was seen on glibc. 1019 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1020 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1021 *Locks::thread_suspend_count_lock_); 1022 } 1023 1024 // Allocate a TLS slot. 1025 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1026 1027 // Double-check the TLS slot allocation. 1028 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1029 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1030 } 1031} 1032 1033void Thread::FinishStartup() { 1034 Runtime* runtime = Runtime::Current(); 1035 CHECK(runtime->IsStarted()); 1036 1037 // Finish attaching the main thread. 1038 ScopedObjectAccess soa(Thread::Current()); 1039 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1040 1041 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1042} 1043 1044void Thread::Shutdown() { 1045 CHECK(is_started_); 1046 is_started_ = false; 1047 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1048 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1049 if (resume_cond_ != nullptr) { 1050 delete resume_cond_; 1051 resume_cond_ = nullptr; 1052 } 1053} 1054 1055Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1056 wait_mutex_ = new Mutex("a thread wait mutex"); 1057 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1058 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1059 tlsPtr_.single_step_control = new SingleStepControl; 1060 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1061 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1062 tlsPtr_.nested_signal_state = static_cast<jmp_buf*>(malloc(sizeof(jmp_buf))); 1063 1064 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1065 tls32_.state_and_flags.as_struct.flags = 0; 1066 tls32_.state_and_flags.as_struct.state = kNative; 1067 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1068 std::fill(tlsPtr_.rosalloc_runs, 1069 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1070 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1071 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1072 tlsPtr_.checkpoint_functions[i] = nullptr; 1073 } 1074} 1075 1076bool Thread::IsStillStarting() const { 1077 // You might think you can check whether the state is kStarting, but for much of thread startup, 1078 // the thread is in kNative; it might also be in kVmWait. 1079 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1080 // assigned fairly early on, and needs to be. 1081 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1082 // this thread _ever_ entered kRunnable". 1083 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1084 (*tlsPtr_.name == kThreadNameDuringStartup); 1085} 1086 1087void Thread::AssertPendingException() const { 1088 if (UNLIKELY(!IsExceptionPending())) { 1089 LOG(FATAL) << "Pending exception expected."; 1090 } 1091} 1092 1093void Thread::AssertNoPendingException() const { 1094 if (UNLIKELY(IsExceptionPending())) { 1095 ScopedObjectAccess soa(Thread::Current()); 1096 mirror::Throwable* exception = GetException(nullptr); 1097 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1098 } 1099} 1100 1101void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1102 if (UNLIKELY(IsExceptionPending())) { 1103 ScopedObjectAccess soa(Thread::Current()); 1104 mirror::Throwable* exception = GetException(nullptr); 1105 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1106 << exception->Dump(); 1107 } 1108} 1109 1110static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1111 RootType /*root_type*/) 1112 NO_THREAD_SAFETY_ANALYSIS { 1113 Thread* self = reinterpret_cast<Thread*>(arg); 1114 mirror::Object* entered_monitor = *object; 1115 if (self->HoldsLock(entered_monitor)) { 1116 LOG(WARNING) << "Calling MonitorExit on object " 1117 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1118 << " left locked by native thread " 1119 << *Thread::Current() << " which is detaching"; 1120 entered_monitor->MonitorExit(self); 1121 } 1122} 1123 1124void Thread::Destroy() { 1125 Thread* self = this; 1126 DCHECK_EQ(self, Thread::Current()); 1127 1128 if (tlsPtr_.jni_env != nullptr) { 1129 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1130 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1131 // Release locally held global references which releasing may require the mutator lock. 1132 if (tlsPtr_.jpeer != nullptr) { 1133 // If pthread_create fails we don't have a jni env here. 1134 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1135 tlsPtr_.jpeer = nullptr; 1136 } 1137 if (tlsPtr_.class_loader_override != nullptr) { 1138 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.class_loader_override); 1139 tlsPtr_.class_loader_override = nullptr; 1140 } 1141 } 1142 1143 if (tlsPtr_.opeer != nullptr) { 1144 ScopedObjectAccess soa(self); 1145 // We may need to call user-supplied managed code, do this before final clean-up. 1146 HandleUncaughtExceptions(soa); 1147 RemoveFromThreadGroup(soa); 1148 1149 // this.nativePeer = 0; 1150 if (Runtime::Current()->IsActiveTransaction()) { 1151 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1152 ->SetLong<true>(tlsPtr_.opeer, 0); 1153 } else { 1154 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1155 ->SetLong<false>(tlsPtr_.opeer, 0); 1156 } 1157 Dbg::PostThreadDeath(self); 1158 1159 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1160 // who is waiting. 1161 mirror::Object* lock = 1162 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1163 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1164 if (lock != nullptr) { 1165 StackHandleScope<1> hs(self); 1166 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1167 ObjectLock<mirror::Object> locker(self, h_obj); 1168 locker.NotifyAll(); 1169 } 1170 tlsPtr_.opeer = nullptr; 1171 } 1172 1173 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1174} 1175 1176Thread::~Thread() { 1177 CHECK(tlsPtr_.class_loader_override == nullptr); 1178 CHECK(tlsPtr_.jpeer == nullptr); 1179 CHECK(tlsPtr_.opeer == nullptr); 1180 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1181 if (initialized) { 1182 delete tlsPtr_.jni_env; 1183 tlsPtr_.jni_env = nullptr; 1184 } 1185 CHECK_NE(GetState(), kRunnable); 1186 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1187 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1188 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1189 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1190 1191 // We may be deleting a still born thread. 1192 SetStateUnsafe(kTerminated); 1193 1194 delete wait_cond_; 1195 delete wait_mutex_; 1196 1197 if (tlsPtr_.long_jump_context != nullptr) { 1198 delete tlsPtr_.long_jump_context; 1199 } 1200 1201 if (initialized) { 1202 CleanupCpu(); 1203 } 1204 1205 delete tlsPtr_.debug_invoke_req; 1206 delete tlsPtr_.single_step_control; 1207 delete tlsPtr_.instrumentation_stack; 1208 delete tlsPtr_.name; 1209 delete tlsPtr_.stack_trace_sample; 1210 free(tlsPtr_.nested_signal_state); 1211 1212 Runtime::Current()->GetHeap()->AssertThreadLocalBuffersAreRevoked(this); 1213 1214 TearDownAlternateSignalStack(); 1215} 1216 1217void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1218 if (!IsExceptionPending()) { 1219 return; 1220 } 1221 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1222 ScopedThreadStateChange tsc(this, kNative); 1223 1224 // Get and clear the exception. 1225 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1226 tlsPtr_.jni_env->ExceptionClear(); 1227 1228 // If the thread has its own handler, use that. 1229 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1230 tlsPtr_.jni_env->GetObjectField(peer.get(), 1231 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1232 if (handler.get() == nullptr) { 1233 // Otherwise use the thread group's default handler. 1234 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1235 WellKnownClasses::java_lang_Thread_group)); 1236 } 1237 1238 // Call the handler. 1239 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1240 WellKnownClasses::java_lang_Thread__UncaughtExceptionHandler_uncaughtException, 1241 peer.get(), exception.get()); 1242 1243 // If the handler threw, clear that exception too. 1244 tlsPtr_.jni_env->ExceptionClear(); 1245} 1246 1247void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1248 // this.group.removeThread(this); 1249 // group can be null if we're in the compiler or a test. 1250 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1251 ->GetObject(tlsPtr_.opeer); 1252 if (ogroup != nullptr) { 1253 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1254 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1255 ScopedThreadStateChange tsc(soa.Self(), kNative); 1256 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1257 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1258 peer.get()); 1259 } 1260} 1261 1262size_t Thread::NumHandleReferences() { 1263 size_t count = 0; 1264 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur != nullptr; cur = cur->GetLink()) { 1265 count += cur->NumberOfReferences(); 1266 } 1267 return count; 1268} 1269 1270bool Thread::HandleScopeContains(jobject obj) const { 1271 StackReference<mirror::Object>* hs_entry = 1272 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1273 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur!= nullptr; cur = cur->GetLink()) { 1274 if (cur->Contains(hs_entry)) { 1275 return true; 1276 } 1277 } 1278 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1279 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1280} 1281 1282void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1283 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1284 size_t num_refs = cur->NumberOfReferences(); 1285 for (size_t j = 0; j < num_refs; ++j) { 1286 mirror::Object* object = cur->GetReference(j); 1287 if (object != nullptr) { 1288 mirror::Object* old_obj = object; 1289 visitor(&object, arg, thread_id, kRootNativeStack); 1290 if (old_obj != object) { 1291 cur->SetReference(j, object); 1292 } 1293 } 1294 } 1295 } 1296} 1297 1298mirror::Object* Thread::DecodeJObject(jobject obj) const { 1299 Locks::mutator_lock_->AssertSharedHeld(this); 1300 if (obj == nullptr) { 1301 return nullptr; 1302 } 1303 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1304 IndirectRefKind kind = GetIndirectRefKind(ref); 1305 mirror::Object* result; 1306 bool expect_null = false; 1307 // The "kinds" below are sorted by the frequency we expect to encounter them. 1308 if (kind == kLocal) { 1309 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1310 // Local references do not need a read barrier. 1311 result = locals.Get<kWithoutReadBarrier>(ref); 1312 } else if (kind == kHandleScopeOrInvalid) { 1313 // TODO: make stack indirect reference table lookup more efficient. 1314 // Check if this is a local reference in the handle scope. 1315 if (LIKELY(HandleScopeContains(obj))) { 1316 // Read from handle scope. 1317 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1318 VerifyObject(result); 1319 } else { 1320 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of invalid jobject %p", obj); 1321 expect_null = true; 1322 result = nullptr; 1323 } 1324 } else if (kind == kGlobal) { 1325 result = tlsPtr_.jni_env->vm->DecodeGlobal(const_cast<Thread*>(this), ref); 1326 } else { 1327 DCHECK_EQ(kind, kWeakGlobal); 1328 result = tlsPtr_.jni_env->vm->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1329 if (Runtime::Current()->IsClearedJniWeakGlobal(result)) { 1330 // This is a special case where it's okay to return nullptr. 1331 expect_null = true; 1332 result = nullptr; 1333 } 1334 } 1335 1336 if (UNLIKELY(!expect_null && result == nullptr)) { 1337 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of deleted %s %p", 1338 ToStr<IndirectRefKind>(kind).c_str(), obj); 1339 } 1340 return result; 1341} 1342 1343// Implements java.lang.Thread.interrupted. 1344bool Thread::Interrupted() { 1345 MutexLock mu(Thread::Current(), *wait_mutex_); 1346 bool interrupted = IsInterruptedLocked(); 1347 SetInterruptedLocked(false); 1348 return interrupted; 1349} 1350 1351// Implements java.lang.Thread.isInterrupted. 1352bool Thread::IsInterrupted() { 1353 MutexLock mu(Thread::Current(), *wait_mutex_); 1354 return IsInterruptedLocked(); 1355} 1356 1357void Thread::Interrupt(Thread* self) { 1358 MutexLock mu(self, *wait_mutex_); 1359 if (interrupted_) { 1360 return; 1361 } 1362 interrupted_ = true; 1363 NotifyLocked(self); 1364} 1365 1366void Thread::Notify() { 1367 Thread* self = Thread::Current(); 1368 MutexLock mu(self, *wait_mutex_); 1369 NotifyLocked(self); 1370} 1371 1372void Thread::NotifyLocked(Thread* self) { 1373 if (wait_monitor_ != nullptr) { 1374 wait_cond_->Signal(self); 1375 } 1376} 1377 1378void Thread::SetClassLoaderOverride(jobject class_loader_override) { 1379 if (tlsPtr_.class_loader_override != nullptr) { 1380 GetJniEnv()->DeleteGlobalRef(tlsPtr_.class_loader_override); 1381 } 1382 tlsPtr_.class_loader_override = GetJniEnv()->NewGlobalRef(class_loader_override); 1383} 1384 1385class CountStackDepthVisitor : public StackVisitor { 1386 public: 1387 explicit CountStackDepthVisitor(Thread* thread) 1388 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1389 : StackVisitor(thread, nullptr), 1390 depth_(0), skip_depth_(0), skipping_(true) {} 1391 1392 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1393 // We want to skip frames up to and including the exception's constructor. 1394 // Note we also skip the frame if it doesn't have a method (namely the callee 1395 // save frame) 1396 mirror::ArtMethod* m = GetMethod(); 1397 if (skipping_ && !m->IsRuntimeMethod() && 1398 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1399 skipping_ = false; 1400 } 1401 if (!skipping_) { 1402 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1403 ++depth_; 1404 } 1405 } else { 1406 ++skip_depth_; 1407 } 1408 return true; 1409 } 1410 1411 int GetDepth() const { 1412 return depth_; 1413 } 1414 1415 int GetSkipDepth() const { 1416 return skip_depth_; 1417 } 1418 1419 private: 1420 uint32_t depth_; 1421 uint32_t skip_depth_; 1422 bool skipping_; 1423}; 1424 1425template<bool kTransactionActive> 1426class BuildInternalStackTraceVisitor : public StackVisitor { 1427 public: 1428 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1429 : StackVisitor(thread, nullptr), self_(self), 1430 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1431 1432 bool Init(int depth) 1433 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1434 // Allocate method trace with an extra slot that will hold the PC trace 1435 StackHandleScope<1> hs(self_); 1436 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1437 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1438 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1439 if (method_trace.Get() == nullptr) { 1440 return false; 1441 } 1442 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1443 if (dex_pc_trace == nullptr) { 1444 return false; 1445 } 1446 // Save PC trace in last element of method trace, also places it into the 1447 // object graph. 1448 // We are called from native: use non-transactional mode. 1449 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1450 // Set the Object*s and assert that no thread suspension is now possible. 1451 const char* last_no_suspend_cause = 1452 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1453 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1454 method_trace_ = method_trace.Get(); 1455 dex_pc_trace_ = dex_pc_trace; 1456 return true; 1457 } 1458 1459 virtual ~BuildInternalStackTraceVisitor() { 1460 if (method_trace_ != nullptr) { 1461 self_->EndAssertNoThreadSuspension(nullptr); 1462 } 1463 } 1464 1465 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1466 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1467 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1468 } 1469 if (skip_depth_ > 0) { 1470 skip_depth_--; 1471 return true; 1472 } 1473 mirror::ArtMethod* m = GetMethod(); 1474 if (m->IsRuntimeMethod()) { 1475 return true; // Ignore runtime frames (in particular callee save). 1476 } 1477 method_trace_->Set<kTransactionActive>(count_, m); 1478 dex_pc_trace_->Set<kTransactionActive>(count_, 1479 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1480 ++count_; 1481 return true; 1482 } 1483 1484 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1485 return method_trace_; 1486 } 1487 1488 private: 1489 Thread* const self_; 1490 // How many more frames to skip. 1491 int32_t skip_depth_; 1492 // Current position down stack trace. 1493 uint32_t count_; 1494 // Array of dex PC values. 1495 mirror::IntArray* dex_pc_trace_; 1496 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1497 mirror::ObjectArray<mirror::Object>* method_trace_; 1498}; 1499 1500template<bool kTransactionActive> 1501jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1502 // Compute depth of stack 1503 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1504 count_visitor.WalkStack(); 1505 int32_t depth = count_visitor.GetDepth(); 1506 int32_t skip_depth = count_visitor.GetSkipDepth(); 1507 1508 // Build internal stack trace. 1509 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1510 const_cast<Thread*>(this), 1511 skip_depth); 1512 if (!build_trace_visitor.Init(depth)) { 1513 return nullptr; // Allocation failed. 1514 } 1515 build_trace_visitor.WalkStack(); 1516 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1517 if (kIsDebugBuild) { 1518 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1519 CHECK(trace->Get(i) != nullptr); 1520 } 1521 } 1522 return soa.AddLocalReference<jobjectArray>(trace); 1523} 1524template jobject Thread::CreateInternalStackTrace<false>( 1525 const ScopedObjectAccessAlreadyRunnable& soa) const; 1526template jobject Thread::CreateInternalStackTrace<true>( 1527 const ScopedObjectAccessAlreadyRunnable& soa) const; 1528 1529jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1530 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1531 int* stack_depth) { 1532 // Decode the internal stack trace into the depth, method trace and PC trace 1533 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1534 1535 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1536 1537 jobjectArray result; 1538 1539 if (output_array != nullptr) { 1540 // Reuse the array we were given. 1541 result = output_array; 1542 // ...adjusting the number of frames we'll write to not exceed the array length. 1543 const int32_t traces_length = 1544 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1545 depth = std::min(depth, traces_length); 1546 } else { 1547 // Create java_trace array and place in local reference table 1548 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1549 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1550 if (java_traces == nullptr) { 1551 return nullptr; 1552 } 1553 result = soa.AddLocalReference<jobjectArray>(java_traces); 1554 } 1555 1556 if (stack_depth != nullptr) { 1557 *stack_depth = depth; 1558 } 1559 1560 for (int32_t i = 0; i < depth; ++i) { 1561 mirror::ObjectArray<mirror::Object>* method_trace = 1562 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1563 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1564 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1565 int32_t line_number; 1566 StackHandleScope<3> hs(soa.Self()); 1567 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1568 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1569 if (method->IsProxyMethod()) { 1570 line_number = -1; 1571 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1572 // source_name_object intentionally left null for proxy methods 1573 } else { 1574 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1575 uint32_t dex_pc = pc_trace->Get(i); 1576 line_number = method->GetLineNumFromDexPC(dex_pc); 1577 // Allocate element, potentially triggering GC 1578 // TODO: reuse class_name_object via Class::name_? 1579 const char* descriptor = method->GetDeclaringClassDescriptor(); 1580 CHECK(descriptor != nullptr); 1581 std::string class_name(PrettyDescriptor(descriptor)); 1582 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1583 if (class_name_object.Get() == nullptr) { 1584 return nullptr; 1585 } 1586 const char* source_file = method->GetDeclaringClassSourceFile(); 1587 if (source_file != nullptr) { 1588 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1589 if (source_name_object.Get() == nullptr) { 1590 return nullptr; 1591 } 1592 } 1593 } 1594 const char* method_name = method->GetName(); 1595 CHECK(method_name != nullptr); 1596 Handle<mirror::String> method_name_object( 1597 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1598 if (method_name_object.Get() == nullptr) { 1599 return nullptr; 1600 } 1601 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1602 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1603 if (obj == nullptr) { 1604 return nullptr; 1605 } 1606 // We are called from native: use non-transactional mode. 1607 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1608 } 1609 return result; 1610} 1611 1612void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1613 const char* exception_class_descriptor, const char* fmt, ...) { 1614 va_list args; 1615 va_start(args, fmt); 1616 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1617 fmt, args); 1618 va_end(args); 1619} 1620 1621void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1622 const char* exception_class_descriptor, 1623 const char* fmt, va_list ap) { 1624 std::string msg; 1625 StringAppendV(&msg, fmt, ap); 1626 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1627} 1628 1629void Thread::ThrowNewException(const ThrowLocation& throw_location, 1630 const char* exception_class_descriptor, 1631 const char* msg) { 1632 // Callers should either clear or call ThrowNewWrappedException. 1633 AssertNoPendingExceptionForNewException(msg); 1634 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1635} 1636 1637void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1638 const char* exception_class_descriptor, 1639 const char* msg) { 1640 DCHECK_EQ(this, Thread::Current()); 1641 ScopedObjectAccessUnchecked soa(this); 1642 StackHandleScope<5> hs(soa.Self()); 1643 // Ensure we don't forget arguments over object allocation. 1644 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1645 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1646 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1647 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1648 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1649 ClearException(); 1650 Runtime* runtime = Runtime::Current(); 1651 1652 mirror::ClassLoader* cl = nullptr; 1653 if (saved_throw_method.Get() != nullptr) { 1654 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1655 } 1656 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1657 Handle<mirror::Class> exception_class( 1658 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1659 class_loader))); 1660 if (UNLIKELY(exception_class.Get() == nullptr)) { 1661 CHECK(IsExceptionPending()); 1662 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1663 return; 1664 } 1665 1666 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(soa.Self(), exception_class, true, 1667 true))) { 1668 DCHECK(IsExceptionPending()); 1669 return; 1670 } 1671 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1672 Handle<mirror::Throwable> exception( 1673 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1674 1675 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1676 if (exception.Get() == nullptr) { 1677 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1678 throw_location.GetDexPc()); 1679 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1680 SetExceptionReportedToInstrumentation(is_exception_reported); 1681 return; 1682 } 1683 1684 // Choose an appropriate constructor and set up the arguments. 1685 const char* signature; 1686 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1687 if (msg != nullptr) { 1688 // Ensure we remember this and the method over the String allocation. 1689 msg_string.reset( 1690 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1691 if (UNLIKELY(msg_string.get() == nullptr)) { 1692 CHECK(IsExceptionPending()); // OOME. 1693 return; 1694 } 1695 if (cause.get() == nullptr) { 1696 signature = "(Ljava/lang/String;)V"; 1697 } else { 1698 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1699 } 1700 } else { 1701 if (cause.get() == nullptr) { 1702 signature = "()V"; 1703 } else { 1704 signature = "(Ljava/lang/Throwable;)V"; 1705 } 1706 } 1707 mirror::ArtMethod* exception_init_method = 1708 exception_class->FindDeclaredDirectMethod("<init>", signature); 1709 1710 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1711 << PrettyDescriptor(exception_class_descriptor); 1712 1713 if (UNLIKELY(!runtime->IsStarted())) { 1714 // Something is trying to throw an exception without a started runtime, which is the common 1715 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1716 // the exception fields directly. 1717 if (msg != nullptr) { 1718 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1719 } 1720 if (cause.get() != nullptr) { 1721 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1722 } 1723 ScopedLocalRef<jobject> trace(GetJniEnv(), 1724 Runtime::Current()->IsActiveTransaction() 1725 ? CreateInternalStackTrace<true>(soa) 1726 : CreateInternalStackTrace<false>(soa)); 1727 if (trace.get() != nullptr) { 1728 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1729 } 1730 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1731 throw_location.GetDexPc()); 1732 SetException(gc_safe_throw_location, exception.Get()); 1733 SetExceptionReportedToInstrumentation(is_exception_reported); 1734 } else { 1735 jvalue jv_args[2]; 1736 size_t i = 0; 1737 1738 if (msg != nullptr) { 1739 jv_args[i].l = msg_string.get(); 1740 ++i; 1741 } 1742 if (cause.get() != nullptr) { 1743 jv_args[i].l = cause.get(); 1744 ++i; 1745 } 1746 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1747 if (LIKELY(!IsExceptionPending())) { 1748 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1749 throw_location.GetDexPc()); 1750 SetException(gc_safe_throw_location, exception.Get()); 1751 SetExceptionReportedToInstrumentation(is_exception_reported); 1752 } 1753 } 1754} 1755 1756void Thread::ThrowOutOfMemoryError(const char* msg) { 1757 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1758 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1759 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1760 if (!tls32_.throwing_OutOfMemoryError) { 1761 tls32_.throwing_OutOfMemoryError = true; 1762 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1763 tls32_.throwing_OutOfMemoryError = false; 1764 } else { 1765 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1766 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1767 } 1768} 1769 1770Thread* Thread::CurrentFromGdb() { 1771 return Thread::Current(); 1772} 1773 1774void Thread::DumpFromGdb() const { 1775 std::ostringstream ss; 1776 Dump(ss); 1777 std::string str(ss.str()); 1778 // log to stderr for debugging command line processes 1779 std::cerr << str; 1780#ifdef HAVE_ANDROID_OS 1781 // log to logcat for debugging frameworks processes 1782 LOG(INFO) << str; 1783#endif 1784} 1785 1786// Explicitly instantiate 32 and 64bit thread offset dumping support. 1787template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1788template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1789 1790template<size_t ptr_size> 1791void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1792#define DO_THREAD_OFFSET(x, y) \ 1793 if (offset == x.Uint32Value()) { \ 1794 os << y; \ 1795 return; \ 1796 } 1797 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1798 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1799 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1800 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1801 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1802 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1803 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1804 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1805 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1806 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1807 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1808 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1809 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1810#undef DO_THREAD_OFFSET 1811 1812#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1813 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1814 os << #x; \ 1815 return; \ 1816 } 1817 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1818 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1819#undef INTERPRETER_ENTRY_POINT_INFO 1820 1821#define JNI_ENTRY_POINT_INFO(x) \ 1822 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1823 os << #x; \ 1824 return; \ 1825 } 1826 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1827#undef JNI_ENTRY_POINT_INFO 1828 1829#define PORTABLE_ENTRY_POINT_INFO(x) \ 1830 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1831 os << #x; \ 1832 return; \ 1833 } 1834 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1835 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1836 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1837#undef PORTABLE_ENTRY_POINT_INFO 1838 1839#define QUICK_ENTRY_POINT_INFO(x) \ 1840 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1841 os << #x; \ 1842 return; \ 1843 } 1844 QUICK_ENTRY_POINT_INFO(pAllocArray) 1845 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1846 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1847 QUICK_ENTRY_POINT_INFO(pAllocObject) 1848 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1849 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1850 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1851 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1852 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1853 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1854 QUICK_ENTRY_POINT_INFO(pCheckCast) 1855 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1856 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1857 QUICK_ENTRY_POINT_INFO(pInitializeType) 1858 QUICK_ENTRY_POINT_INFO(pResolveString) 1859 QUICK_ENTRY_POINT_INFO(pSet8Instance) 1860 QUICK_ENTRY_POINT_INFO(pSet8Static) 1861 QUICK_ENTRY_POINT_INFO(pSet16Instance) 1862 QUICK_ENTRY_POINT_INFO(pSet16Static) 1863 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1864 QUICK_ENTRY_POINT_INFO(pSet32Static) 1865 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1866 QUICK_ENTRY_POINT_INFO(pSet64Static) 1867 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1868 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1869 QUICK_ENTRY_POINT_INFO(pGetByteInstance) 1870 QUICK_ENTRY_POINT_INFO(pGetBooleanInstance) 1871 QUICK_ENTRY_POINT_INFO(pGetByteStatic) 1872 QUICK_ENTRY_POINT_INFO(pGetBooleanStatic) 1873 QUICK_ENTRY_POINT_INFO(pGetShortInstance) 1874 QUICK_ENTRY_POINT_INFO(pGetCharInstance) 1875 QUICK_ENTRY_POINT_INFO(pGetShortStatic) 1876 QUICK_ENTRY_POINT_INFO(pGetCharStatic) 1877 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1878 QUICK_ENTRY_POINT_INFO(pGet32Static) 1879 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1880 QUICK_ENTRY_POINT_INFO(pGet64Static) 1881 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1882 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1883 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1884 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1885 QUICK_ENTRY_POINT_INFO(pAputObject) 1886 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1887 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1888 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1889 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1890 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1891 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1892 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1893 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1894 QUICK_ENTRY_POINT_INFO(pLockObject) 1895 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1896 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1897 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1898 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1899 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1900 QUICK_ENTRY_POINT_INFO(pFmod) 1901 QUICK_ENTRY_POINT_INFO(pL2d) 1902 QUICK_ENTRY_POINT_INFO(pFmodf) 1903 QUICK_ENTRY_POINT_INFO(pL2f) 1904 QUICK_ENTRY_POINT_INFO(pD2iz) 1905 QUICK_ENTRY_POINT_INFO(pF2iz) 1906 QUICK_ENTRY_POINT_INFO(pIdivmod) 1907 QUICK_ENTRY_POINT_INFO(pD2l) 1908 QUICK_ENTRY_POINT_INFO(pF2l) 1909 QUICK_ENTRY_POINT_INFO(pLdiv) 1910 QUICK_ENTRY_POINT_INFO(pLmod) 1911 QUICK_ENTRY_POINT_INFO(pLmul) 1912 QUICK_ENTRY_POINT_INFO(pShlLong) 1913 QUICK_ENTRY_POINT_INFO(pShrLong) 1914 QUICK_ENTRY_POINT_INFO(pUshrLong) 1915 QUICK_ENTRY_POINT_INFO(pIndexOf) 1916 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1917 QUICK_ENTRY_POINT_INFO(pMemcpy) 1918 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1919 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1920 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1921 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1922 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1923 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1924 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1925 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1926 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1927 QUICK_ENTRY_POINT_INFO(pDeliverException) 1928 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1929 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1930 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1931 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1932 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1933 QUICK_ENTRY_POINT_INFO(pA64Load) 1934 QUICK_ENTRY_POINT_INFO(pA64Store) 1935#undef QUICK_ENTRY_POINT_INFO 1936 1937 os << offset; 1938} 1939 1940void Thread::QuickDeliverException() { 1941 // Get exception from thread. 1942 ThrowLocation throw_location; 1943 mirror::Throwable* exception = GetException(&throw_location); 1944 CHECK(exception != nullptr); 1945 // Don't leave exception visible while we try to find the handler, which may cause class 1946 // resolution. 1947 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1948 ClearException(); 1949 bool is_deoptimization = (exception == GetDeoptimizationException()); 1950 QuickExceptionHandler exception_handler(this, is_deoptimization); 1951 if (is_deoptimization) { 1952 exception_handler.DeoptimizeStack(); 1953 } else { 1954 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1955 } 1956 exception_handler.UpdateInstrumentationStack(); 1957 exception_handler.DoLongJump(); 1958 LOG(FATAL) << "UNREACHABLE"; 1959} 1960 1961Context* Thread::GetLongJumpContext() { 1962 Context* result = tlsPtr_.long_jump_context; 1963 if (result == nullptr) { 1964 result = Context::Create(); 1965 } else { 1966 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1967 result->Reset(); 1968 } 1969 return result; 1970} 1971 1972// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 1973// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 1974struct CurrentMethodVisitor FINAL : public StackVisitor { 1975 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 1976 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1977 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0), 1978 abort_on_error_(abort_on_error) {} 1979 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1980 mirror::ArtMethod* m = GetMethod(); 1981 if (m->IsRuntimeMethod()) { 1982 // Continue if this is a runtime method. 1983 return true; 1984 } 1985 if (context_ != nullptr) { 1986 this_object_ = GetThisObject(); 1987 } 1988 method_ = m; 1989 dex_pc_ = GetDexPc(abort_on_error_); 1990 return false; 1991 } 1992 mirror::Object* this_object_; 1993 mirror::ArtMethod* method_; 1994 uint32_t dex_pc_; 1995 const bool abort_on_error_; 1996}; 1997 1998mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 1999 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 2000 visitor.WalkStack(false); 2001 if (dex_pc != nullptr) { 2002 *dex_pc = visitor.dex_pc_; 2003 } 2004 return visitor.method_; 2005} 2006 2007ThrowLocation Thread::GetCurrentLocationForThrow() { 2008 Context* context = GetLongJumpContext(); 2009 CurrentMethodVisitor visitor(this, context, true); 2010 visitor.WalkStack(false); 2011 ReleaseLongJumpContext(context); 2012 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 2013} 2014 2015bool Thread::HoldsLock(mirror::Object* object) const { 2016 if (object == nullptr) { 2017 return false; 2018 } 2019 return object->GetLockOwnerThreadId() == GetThreadId(); 2020} 2021 2022// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2023template <typename RootVisitor> 2024class ReferenceMapVisitor : public StackVisitor { 2025 public: 2026 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 2027 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2028 : StackVisitor(thread, context), visitor_(visitor) {} 2029 2030 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2031 if (false) { 2032 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2033 << StringPrintf("@ PC:%04x", GetDexPc()); 2034 } 2035 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2036 if (shadow_frame != nullptr) { 2037 VisitShadowFrame(shadow_frame); 2038 } else { 2039 VisitQuickFrame(); 2040 } 2041 return true; 2042 } 2043 2044 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2045 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 2046 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 2047 mirror::ArtMethod* m = *method_addr; 2048 DCHECK(m != nullptr); 2049 size_t num_regs = shadow_frame->NumberOfVRegs(); 2050 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2051 // handle scope for JNI or References for interpreter. 2052 for (size_t reg = 0; reg < num_regs; ++reg) { 2053 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2054 if (ref != nullptr) { 2055 mirror::Object* new_ref = ref; 2056 visitor_(&new_ref, reg, this); 2057 if (new_ref != ref) { 2058 shadow_frame->SetVRegReference(reg, new_ref); 2059 } 2060 } 2061 } 2062 } else { 2063 // Java method. 2064 // Portable path use DexGcMap and store in Method.native_gc_map_. 2065 const uint8_t* gc_map = m->GetNativeGcMap(); 2066 CHECK(gc_map != nullptr) << PrettyMethod(m); 2067 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2068 uint32_t dex_pc = shadow_frame->GetDexPC(); 2069 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2070 DCHECK(reg_bitmap != nullptr); 2071 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2072 for (size_t reg = 0; reg < num_regs; ++reg) { 2073 if (TestBitmap(reg, reg_bitmap)) { 2074 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2075 if (ref != nullptr) { 2076 mirror::Object* new_ref = ref; 2077 visitor_(&new_ref, reg, this); 2078 if (new_ref != ref) { 2079 shadow_frame->SetVRegReference(reg, new_ref); 2080 } 2081 } 2082 } 2083 } 2084 } 2085 } 2086 2087 private: 2088 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2089 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2090 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2091 mirror::ArtMethod* old_method = m; 2092 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2093 if (m != old_method) { 2094 cur_quick_frame->Assign(m); 2095 } 2096 2097 // Process register map (which native and runtime methods don't have) 2098 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2099 if (m->IsOptimized()) { 2100 Runtime* runtime = Runtime::Current(); 2101 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2102 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2103 StackMap map = m->GetStackMap(native_pc_offset); 2104 MemoryRegion mask = map.GetStackMask(); 2105 for (size_t i = 0; i < mask.size_in_bits(); ++i) { 2106 if (mask.LoadBit(i)) { 2107 StackReference<mirror::Object>* ref_addr = 2108 reinterpret_cast<StackReference<mirror::Object>*>(cur_quick_frame) + i; 2109 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2110 if (ref != nullptr) { 2111 mirror::Object* new_ref = ref; 2112 visitor_(&new_ref, -1, this); 2113 if (ref != new_ref) { 2114 ref_addr->Assign(new_ref); 2115 } 2116 } 2117 } 2118 } 2119 } else { 2120 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2121 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2122 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2123 // Can't be nullptr or how would we compile its instructions? 2124 DCHECK(code_item != nullptr) << PrettyMethod(m); 2125 NativePcOffsetToReferenceMap map(native_gc_map); 2126 size_t num_regs = std::min(map.RegWidth() * 8, 2127 static_cast<size_t>(code_item->registers_size_)); 2128 if (num_regs > 0) { 2129 Runtime* runtime = Runtime::Current(); 2130 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2131 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2132 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2133 DCHECK(reg_bitmap != nullptr); 2134 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2135 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2136 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2137 // For all dex registers in the bitmap 2138 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2139 DCHECK(cur_quick_frame != nullptr); 2140 for (size_t reg = 0; reg < num_regs; ++reg) { 2141 // Does this register hold a reference? 2142 if (TestBitmap(reg, reg_bitmap)) { 2143 uint32_t vmap_offset; 2144 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2145 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2146 kReferenceVReg); 2147 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2148 mirror::Object** ref_addr = 2149 reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2150 if (*ref_addr != nullptr) { 2151 visitor_(ref_addr, reg, this); 2152 } 2153 } else { 2154 StackReference<mirror::Object>* ref_addr = 2155 reinterpret_cast<StackReference<mirror::Object>*>( 2156 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2157 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2158 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2159 if (ref != nullptr) { 2160 mirror::Object* new_ref = ref; 2161 visitor_(&new_ref, reg, this); 2162 if (ref != new_ref) { 2163 ref_addr->Assign(new_ref); 2164 } 2165 } 2166 } 2167 } 2168 } 2169 } 2170 } 2171 } 2172 } 2173 2174 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2175 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2176 } 2177 2178 // Visitor for when we visit a root. 2179 const RootVisitor& visitor_; 2180}; 2181 2182class RootCallbackVisitor { 2183 public: 2184 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2185 : callback_(callback), arg_(arg), tid_(tid) {} 2186 2187 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2188 callback_(obj, arg_, tid_, kRootJavaFrame); 2189 } 2190 2191 private: 2192 RootCallback* const callback_; 2193 void* const arg_; 2194 const uint32_t tid_; 2195}; 2196 2197void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2198 uint32_t thread_id = GetThreadId(); 2199 if (tlsPtr_.opeer != nullptr) { 2200 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2201 } 2202 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2203 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2204 } 2205 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2206 if (tlsPtr_.monitor_enter_object != nullptr) { 2207 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2208 } 2209 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2210 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2211 HandleScopeVisitRoots(visitor, arg, thread_id); 2212 if (tlsPtr_.debug_invoke_req != nullptr) { 2213 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2214 } 2215 if (tlsPtr_.single_step_control != nullptr) { 2216 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2217 } 2218 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2219 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2220 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2221 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2222 shadow_frame = shadow_frame->GetLink()) { 2223 mapper.VisitShadowFrame(shadow_frame); 2224 } 2225 } 2226 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2227 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2228 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2229 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2230 shadow_frame != nullptr; 2231 shadow_frame = shadow_frame->GetLink()) { 2232 mapper.VisitShadowFrame(shadow_frame); 2233 } 2234 } 2235 // Visit roots on this thread's stack 2236 Context* context = GetLongJumpContext(); 2237 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2238 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2239 mapper.WalkStack(); 2240 ReleaseLongJumpContext(context); 2241 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2242 if (frame.this_object_ != nullptr) { 2243 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2244 } 2245 DCHECK(frame.method_ != nullptr); 2246 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2247 } 2248} 2249 2250static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2251 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2252 VerifyObject(*root); 2253} 2254 2255void Thread::VerifyStackImpl() { 2256 std::unique_ptr<Context> context(Context::Create()); 2257 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2258 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2259 mapper.WalkStack(); 2260} 2261 2262// Set the stack end to that to be used during a stack overflow 2263void Thread::SetStackEndForStackOverflow() { 2264 // During stack overflow we allow use of the full stack. 2265 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2266 // However, we seem to have already extended to use the full stack. 2267 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2268 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2269 DumpStack(LOG(ERROR)); 2270 LOG(FATAL) << "Recursive stack overflow."; 2271 } 2272 2273 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2274 2275 // Remove the stack overflow protection if is it set up. 2276 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2277 if (implicit_stack_check) { 2278 if (!UnprotectStack()) { 2279 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2280 } 2281 } 2282} 2283 2284void Thread::SetTlab(uint8_t* start, uint8_t* end) { 2285 DCHECK_LE(start, end); 2286 tlsPtr_.thread_local_start = start; 2287 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2288 tlsPtr_.thread_local_end = end; 2289 tlsPtr_.thread_local_objects = 0; 2290} 2291 2292bool Thread::HasTlab() const { 2293 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2294 if (has_tlab) { 2295 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2296 } else { 2297 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2298 } 2299 return has_tlab; 2300} 2301 2302std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2303 thread.ShortDump(os); 2304 return os; 2305} 2306 2307void Thread::ProtectStack() { 2308 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2309 VLOG(threads) << "Protecting stack at " << pregion; 2310 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2311 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2312 "Reason: " 2313 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2314 } 2315} 2316 2317bool Thread::UnprotectStack() { 2318 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2319 VLOG(threads) << "Unprotecting stack at " << pregion; 2320 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2321} 2322 2323 2324} // namespace art 2325