thread.cc revision acbb30867482986e02a7cc53c099b8d56d32acee
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*>(&tlsPtr_.quick_entrypoints) + 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<3> scope(const_cast<Thread*>(this)); 954 Handle<mirror::Throwable> exc; 955 Handle<mirror::Object> throw_location_this_object; 956 Handle<mirror::ArtMethod> throw_location_method; 957 uint32_t throw_location_dex_pc; 958 bool have_exception = false; 959 if (IsExceptionPending()) { 960 ThrowLocation exc_location; 961 exc = scope.NewHandle(GetException(&exc_location)); 962 throw_location_this_object = scope.NewHandle(exc_location.GetThis()); 963 throw_location_method = scope.NewHandle(exc_location.GetMethod()); 964 throw_location_dex_pc = exc_location.GetDexPc(); 965 const_cast<Thread*>(this)->ClearException(); 966 have_exception = true; 967 } 968 969 std::unique_ptr<Context> context(Context::Create()); 970 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 971 !tls32_.throwing_OutOfMemoryError); 972 dumper.WalkStack(); 973 974 if (have_exception) { 975 ThrowLocation exc_location(throw_location_this_object.Get(), 976 throw_location_method.Get(), 977 throw_location_dex_pc); 978 const_cast<Thread*>(this)->SetException(exc_location, exc.Get()); 979 } 980} 981 982void Thread::DumpStack(std::ostream& os) const { 983 // TODO: we call this code when dying but may not have suspended the thread ourself. The 984 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 985 // the race with the thread_suspend_count_lock_). 986 bool dump_for_abort = (gAborting > 0); 987 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 988 if (!kIsDebugBuild) { 989 // We always want to dump the stack for an abort, however, there is no point dumping another 990 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 991 safe_to_dump = (safe_to_dump || dump_for_abort); 992 } 993 if (safe_to_dump) { 994 // If we're currently in native code, dump that stack before dumping the managed stack. 995 if (dump_for_abort || ShouldShowNativeStack(this)) { 996 DumpKernelStack(os, GetTid(), " kernel: ", false); 997 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr, !dump_for_abort)); 998 } 999 DumpJavaStack(os); 1000 } else { 1001 os << "Not able to dump stack of thread that isn't suspended"; 1002 } 1003} 1004 1005void Thread::ThreadExitCallback(void* arg) { 1006 Thread* self = reinterpret_cast<Thread*>(arg); 1007 if (self->tls32_.thread_exit_check_count == 0) { 1008 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1009 "going to use a pthread_key_create destructor?): " << *self; 1010 CHECK(is_started_); 1011 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1012 self->tls32_.thread_exit_check_count = 1; 1013 } else { 1014 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1015 } 1016} 1017 1018void Thread::Startup() { 1019 CHECK(!is_started_); 1020 is_started_ = true; 1021 { 1022 // MutexLock to keep annotalysis happy. 1023 // 1024 // Note we use nullptr for the thread because Thread::Current can 1025 // return garbage since (is_started_ == true) and 1026 // Thread::pthread_key_self_ is not yet initialized. 1027 // This was seen on glibc. 1028 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1029 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1030 *Locks::thread_suspend_count_lock_); 1031 } 1032 1033 // Allocate a TLS slot. 1034 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1035 1036 // Double-check the TLS slot allocation. 1037 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1038 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1039 } 1040} 1041 1042void Thread::FinishStartup() { 1043 Runtime* runtime = Runtime::Current(); 1044 CHECK(runtime->IsStarted()); 1045 1046 // Finish attaching the main thread. 1047 ScopedObjectAccess soa(Thread::Current()); 1048 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1049 1050 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1051} 1052 1053void Thread::Shutdown() { 1054 CHECK(is_started_); 1055 is_started_ = false; 1056 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1057 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1058 if (resume_cond_ != nullptr) { 1059 delete resume_cond_; 1060 resume_cond_ = nullptr; 1061 } 1062} 1063 1064Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1065 wait_mutex_ = new Mutex("a thread wait mutex"); 1066 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1067 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1068 tlsPtr_.single_step_control = new SingleStepControl; 1069 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1070 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1071 tlsPtr_.nested_signal_state = static_cast<jmp_buf*>(malloc(sizeof(jmp_buf))); 1072 1073 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1074 tls32_.state_and_flags.as_struct.flags = 0; 1075 tls32_.state_and_flags.as_struct.state = kNative; 1076 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1077 std::fill(tlsPtr_.rosalloc_runs, 1078 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1079 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1080 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1081 tlsPtr_.checkpoint_functions[i] = nullptr; 1082 } 1083} 1084 1085bool Thread::IsStillStarting() const { 1086 // You might think you can check whether the state is kStarting, but for much of thread startup, 1087 // the thread is in kNative; it might also be in kVmWait. 1088 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1089 // assigned fairly early on, and needs to be. 1090 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1091 // this thread _ever_ entered kRunnable". 1092 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1093 (*tlsPtr_.name == kThreadNameDuringStartup); 1094} 1095 1096void Thread::AssertPendingException() const { 1097 if (UNLIKELY(!IsExceptionPending())) { 1098 LOG(FATAL) << "Pending exception expected."; 1099 } 1100} 1101 1102void Thread::AssertNoPendingException() const { 1103 if (UNLIKELY(IsExceptionPending())) { 1104 ScopedObjectAccess soa(Thread::Current()); 1105 mirror::Throwable* exception = GetException(nullptr); 1106 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1107 } 1108} 1109 1110void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1111 if (UNLIKELY(IsExceptionPending())) { 1112 ScopedObjectAccess soa(Thread::Current()); 1113 mirror::Throwable* exception = GetException(nullptr); 1114 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1115 << exception->Dump(); 1116 } 1117} 1118 1119static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1120 RootType /*root_type*/) 1121 NO_THREAD_SAFETY_ANALYSIS { 1122 Thread* self = reinterpret_cast<Thread*>(arg); 1123 mirror::Object* entered_monitor = *object; 1124 if (self->HoldsLock(entered_monitor)) { 1125 LOG(WARNING) << "Calling MonitorExit on object " 1126 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1127 << " left locked by native thread " 1128 << *Thread::Current() << " which is detaching"; 1129 entered_monitor->MonitorExit(self); 1130 } 1131} 1132 1133void Thread::Destroy() { 1134 Thread* self = this; 1135 DCHECK_EQ(self, Thread::Current()); 1136 1137 if (tlsPtr_.jni_env != nullptr) { 1138 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1139 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1140 // Release locally held global references which releasing may require the mutator lock. 1141 if (tlsPtr_.jpeer != nullptr) { 1142 // If pthread_create fails we don't have a jni env here. 1143 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1144 tlsPtr_.jpeer = nullptr; 1145 } 1146 if (tlsPtr_.class_loader_override != nullptr) { 1147 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.class_loader_override); 1148 tlsPtr_.class_loader_override = nullptr; 1149 } 1150 } 1151 1152 if (tlsPtr_.opeer != nullptr) { 1153 ScopedObjectAccess soa(self); 1154 // We may need to call user-supplied managed code, do this before final clean-up. 1155 HandleUncaughtExceptions(soa); 1156 RemoveFromThreadGroup(soa); 1157 1158 // this.nativePeer = 0; 1159 if (Runtime::Current()->IsActiveTransaction()) { 1160 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1161 ->SetLong<true>(tlsPtr_.opeer, 0); 1162 } else { 1163 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1164 ->SetLong<false>(tlsPtr_.opeer, 0); 1165 } 1166 Dbg::PostThreadDeath(self); 1167 1168 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1169 // who is waiting. 1170 mirror::Object* lock = 1171 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1172 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1173 if (lock != nullptr) { 1174 StackHandleScope<1> hs(self); 1175 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1176 ObjectLock<mirror::Object> locker(self, h_obj); 1177 locker.NotifyAll(); 1178 } 1179 tlsPtr_.opeer = nullptr; 1180 } 1181 1182 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1183} 1184 1185Thread::~Thread() { 1186 CHECK(tlsPtr_.class_loader_override == nullptr); 1187 CHECK(tlsPtr_.jpeer == nullptr); 1188 CHECK(tlsPtr_.opeer == nullptr); 1189 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1190 if (initialized) { 1191 delete tlsPtr_.jni_env; 1192 tlsPtr_.jni_env = nullptr; 1193 } 1194 CHECK_NE(GetState(), kRunnable); 1195 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1196 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1197 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1198 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1199 1200 // We may be deleting a still born thread. 1201 SetStateUnsafe(kTerminated); 1202 1203 delete wait_cond_; 1204 delete wait_mutex_; 1205 1206 if (tlsPtr_.long_jump_context != nullptr) { 1207 delete tlsPtr_.long_jump_context; 1208 } 1209 1210 if (initialized) { 1211 CleanupCpu(); 1212 } 1213 1214 delete tlsPtr_.debug_invoke_req; 1215 delete tlsPtr_.single_step_control; 1216 delete tlsPtr_.instrumentation_stack; 1217 delete tlsPtr_.name; 1218 delete tlsPtr_.stack_trace_sample; 1219 free(tlsPtr_.nested_signal_state); 1220 1221 Runtime::Current()->GetHeap()->AssertThreadLocalBuffersAreRevoked(this); 1222 1223 TearDownAlternateSignalStack(); 1224} 1225 1226void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1227 if (!IsExceptionPending()) { 1228 return; 1229 } 1230 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1231 ScopedThreadStateChange tsc(this, kNative); 1232 1233 // Get and clear the exception. 1234 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1235 tlsPtr_.jni_env->ExceptionClear(); 1236 1237 // If the thread has its own handler, use that. 1238 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1239 tlsPtr_.jni_env->GetObjectField(peer.get(), 1240 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1241 if (handler.get() == nullptr) { 1242 // Otherwise use the thread group's default handler. 1243 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1244 WellKnownClasses::java_lang_Thread_group)); 1245 } 1246 1247 // Call the handler. 1248 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1249 WellKnownClasses::java_lang_Thread__UncaughtExceptionHandler_uncaughtException, 1250 peer.get(), exception.get()); 1251 1252 // If the handler threw, clear that exception too. 1253 tlsPtr_.jni_env->ExceptionClear(); 1254} 1255 1256void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1257 // this.group.removeThread(this); 1258 // group can be null if we're in the compiler or a test. 1259 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1260 ->GetObject(tlsPtr_.opeer); 1261 if (ogroup != nullptr) { 1262 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1263 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1264 ScopedThreadStateChange tsc(soa.Self(), kNative); 1265 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1266 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1267 peer.get()); 1268 } 1269} 1270 1271size_t Thread::NumHandleReferences() { 1272 size_t count = 0; 1273 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur != nullptr; cur = cur->GetLink()) { 1274 count += cur->NumberOfReferences(); 1275 } 1276 return count; 1277} 1278 1279bool Thread::HandleScopeContains(jobject obj) const { 1280 StackReference<mirror::Object>* hs_entry = 1281 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1282 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur!= nullptr; cur = cur->GetLink()) { 1283 if (cur->Contains(hs_entry)) { 1284 return true; 1285 } 1286 } 1287 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1288 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1289} 1290 1291void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1292 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1293 size_t num_refs = cur->NumberOfReferences(); 1294 for (size_t j = 0; j < num_refs; ++j) { 1295 mirror::Object* object = cur->GetReference(j); 1296 if (object != nullptr) { 1297 mirror::Object* old_obj = object; 1298 visitor(&object, arg, thread_id, kRootNativeStack); 1299 if (old_obj != object) { 1300 cur->SetReference(j, object); 1301 } 1302 } 1303 } 1304 } 1305} 1306 1307mirror::Object* Thread::DecodeJObject(jobject obj) const { 1308 Locks::mutator_lock_->AssertSharedHeld(this); 1309 if (obj == nullptr) { 1310 return nullptr; 1311 } 1312 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1313 IndirectRefKind kind = GetIndirectRefKind(ref); 1314 mirror::Object* result; 1315 bool expect_null = false; 1316 // The "kinds" below are sorted by the frequency we expect to encounter them. 1317 if (kind == kLocal) { 1318 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1319 // Local references do not need a read barrier. 1320 result = locals.Get<kWithoutReadBarrier>(ref); 1321 } else if (kind == kHandleScopeOrInvalid) { 1322 // TODO: make stack indirect reference table lookup more efficient. 1323 // Check if this is a local reference in the handle scope. 1324 if (LIKELY(HandleScopeContains(obj))) { 1325 // Read from handle scope. 1326 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1327 VerifyObject(result); 1328 } else { 1329 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of invalid jobject %p", obj); 1330 expect_null = true; 1331 result = nullptr; 1332 } 1333 } else if (kind == kGlobal) { 1334 result = tlsPtr_.jni_env->vm->DecodeGlobal(const_cast<Thread*>(this), ref); 1335 } else { 1336 DCHECK_EQ(kind, kWeakGlobal); 1337 result = tlsPtr_.jni_env->vm->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1338 if (Runtime::Current()->IsClearedJniWeakGlobal(result)) { 1339 // This is a special case where it's okay to return nullptr. 1340 expect_null = true; 1341 result = nullptr; 1342 } 1343 } 1344 1345 if (UNLIKELY(!expect_null && result == nullptr)) { 1346 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of deleted %s %p", 1347 ToStr<IndirectRefKind>(kind).c_str(), obj); 1348 } 1349 return result; 1350} 1351 1352// Implements java.lang.Thread.interrupted. 1353bool Thread::Interrupted() { 1354 MutexLock mu(Thread::Current(), *wait_mutex_); 1355 bool interrupted = IsInterruptedLocked(); 1356 SetInterruptedLocked(false); 1357 return interrupted; 1358} 1359 1360// Implements java.lang.Thread.isInterrupted. 1361bool Thread::IsInterrupted() { 1362 MutexLock mu(Thread::Current(), *wait_mutex_); 1363 return IsInterruptedLocked(); 1364} 1365 1366void Thread::Interrupt(Thread* self) { 1367 MutexLock mu(self, *wait_mutex_); 1368 if (interrupted_) { 1369 return; 1370 } 1371 interrupted_ = true; 1372 NotifyLocked(self); 1373} 1374 1375void Thread::Notify() { 1376 Thread* self = Thread::Current(); 1377 MutexLock mu(self, *wait_mutex_); 1378 NotifyLocked(self); 1379} 1380 1381void Thread::NotifyLocked(Thread* self) { 1382 if (wait_monitor_ != nullptr) { 1383 wait_cond_->Signal(self); 1384 } 1385} 1386 1387void Thread::SetClassLoaderOverride(jobject class_loader_override) { 1388 if (tlsPtr_.class_loader_override != nullptr) { 1389 GetJniEnv()->DeleteGlobalRef(tlsPtr_.class_loader_override); 1390 } 1391 tlsPtr_.class_loader_override = GetJniEnv()->NewGlobalRef(class_loader_override); 1392} 1393 1394class CountStackDepthVisitor : public StackVisitor { 1395 public: 1396 explicit CountStackDepthVisitor(Thread* thread) 1397 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1398 : StackVisitor(thread, nullptr), 1399 depth_(0), skip_depth_(0), skipping_(true) {} 1400 1401 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1402 // We want to skip frames up to and including the exception's constructor. 1403 // Note we also skip the frame if it doesn't have a method (namely the callee 1404 // save frame) 1405 mirror::ArtMethod* m = GetMethod(); 1406 if (skipping_ && !m->IsRuntimeMethod() && 1407 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1408 skipping_ = false; 1409 } 1410 if (!skipping_) { 1411 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1412 ++depth_; 1413 } 1414 } else { 1415 ++skip_depth_; 1416 } 1417 return true; 1418 } 1419 1420 int GetDepth() const { 1421 return depth_; 1422 } 1423 1424 int GetSkipDepth() const { 1425 return skip_depth_; 1426 } 1427 1428 private: 1429 uint32_t depth_; 1430 uint32_t skip_depth_; 1431 bool skipping_; 1432}; 1433 1434template<bool kTransactionActive> 1435class BuildInternalStackTraceVisitor : public StackVisitor { 1436 public: 1437 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1438 : StackVisitor(thread, nullptr), self_(self), 1439 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1440 1441 bool Init(int depth) 1442 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1443 // Allocate method trace with an extra slot that will hold the PC trace 1444 StackHandleScope<1> hs(self_); 1445 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1446 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1447 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1448 if (method_trace.Get() == nullptr) { 1449 return false; 1450 } 1451 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1452 if (dex_pc_trace == nullptr) { 1453 return false; 1454 } 1455 // Save PC trace in last element of method trace, also places it into the 1456 // object graph. 1457 // We are called from native: use non-transactional mode. 1458 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1459 // Set the Object*s and assert that no thread suspension is now possible. 1460 const char* last_no_suspend_cause = 1461 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1462 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1463 method_trace_ = method_trace.Get(); 1464 dex_pc_trace_ = dex_pc_trace; 1465 return true; 1466 } 1467 1468 virtual ~BuildInternalStackTraceVisitor() { 1469 if (method_trace_ != nullptr) { 1470 self_->EndAssertNoThreadSuspension(nullptr); 1471 } 1472 } 1473 1474 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1475 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1476 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1477 } 1478 if (skip_depth_ > 0) { 1479 skip_depth_--; 1480 return true; 1481 } 1482 mirror::ArtMethod* m = GetMethod(); 1483 if (m->IsRuntimeMethod()) { 1484 return true; // Ignore runtime frames (in particular callee save). 1485 } 1486 method_trace_->Set<kTransactionActive>(count_, m); 1487 dex_pc_trace_->Set<kTransactionActive>(count_, 1488 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1489 ++count_; 1490 return true; 1491 } 1492 1493 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1494 return method_trace_; 1495 } 1496 1497 private: 1498 Thread* const self_; 1499 // How many more frames to skip. 1500 int32_t skip_depth_; 1501 // Current position down stack trace. 1502 uint32_t count_; 1503 // Array of dex PC values. 1504 mirror::IntArray* dex_pc_trace_; 1505 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1506 mirror::ObjectArray<mirror::Object>* method_trace_; 1507}; 1508 1509template<bool kTransactionActive> 1510jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1511 // Compute depth of stack 1512 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1513 count_visitor.WalkStack(); 1514 int32_t depth = count_visitor.GetDepth(); 1515 int32_t skip_depth = count_visitor.GetSkipDepth(); 1516 1517 // Build internal stack trace. 1518 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1519 const_cast<Thread*>(this), 1520 skip_depth); 1521 if (!build_trace_visitor.Init(depth)) { 1522 return nullptr; // Allocation failed. 1523 } 1524 build_trace_visitor.WalkStack(); 1525 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1526 if (kIsDebugBuild) { 1527 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1528 CHECK(trace->Get(i) != nullptr); 1529 } 1530 } 1531 return soa.AddLocalReference<jobjectArray>(trace); 1532} 1533template jobject Thread::CreateInternalStackTrace<false>( 1534 const ScopedObjectAccessAlreadyRunnable& soa) const; 1535template jobject Thread::CreateInternalStackTrace<true>( 1536 const ScopedObjectAccessAlreadyRunnable& soa) const; 1537 1538jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1539 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1540 int* stack_depth) { 1541 // Decode the internal stack trace into the depth, method trace and PC trace 1542 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1543 1544 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1545 1546 jobjectArray result; 1547 1548 if (output_array != nullptr) { 1549 // Reuse the array we were given. 1550 result = output_array; 1551 // ...adjusting the number of frames we'll write to not exceed the array length. 1552 const int32_t traces_length = 1553 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1554 depth = std::min(depth, traces_length); 1555 } else { 1556 // Create java_trace array and place in local reference table 1557 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1558 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1559 if (java_traces == nullptr) { 1560 return nullptr; 1561 } 1562 result = soa.AddLocalReference<jobjectArray>(java_traces); 1563 } 1564 1565 if (stack_depth != nullptr) { 1566 *stack_depth = depth; 1567 } 1568 1569 for (int32_t i = 0; i < depth; ++i) { 1570 mirror::ObjectArray<mirror::Object>* method_trace = 1571 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1572 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1573 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1574 int32_t line_number; 1575 StackHandleScope<3> hs(soa.Self()); 1576 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1577 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1578 if (method->IsProxyMethod()) { 1579 line_number = -1; 1580 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1581 // source_name_object intentionally left null for proxy methods 1582 } else { 1583 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1584 uint32_t dex_pc = pc_trace->Get(i); 1585 line_number = method->GetLineNumFromDexPC(dex_pc); 1586 // Allocate element, potentially triggering GC 1587 // TODO: reuse class_name_object via Class::name_? 1588 const char* descriptor = method->GetDeclaringClassDescriptor(); 1589 CHECK(descriptor != nullptr); 1590 std::string class_name(PrettyDescriptor(descriptor)); 1591 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1592 if (class_name_object.Get() == nullptr) { 1593 return nullptr; 1594 } 1595 const char* source_file = method->GetDeclaringClassSourceFile(); 1596 if (source_file != nullptr) { 1597 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1598 if (source_name_object.Get() == nullptr) { 1599 return nullptr; 1600 } 1601 } 1602 } 1603 const char* method_name = method->GetName(); 1604 CHECK(method_name != nullptr); 1605 Handle<mirror::String> method_name_object( 1606 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1607 if (method_name_object.Get() == nullptr) { 1608 return nullptr; 1609 } 1610 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1611 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1612 if (obj == nullptr) { 1613 return nullptr; 1614 } 1615 // We are called from native: use non-transactional mode. 1616 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1617 } 1618 return result; 1619} 1620 1621void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1622 const char* exception_class_descriptor, const char* fmt, ...) { 1623 va_list args; 1624 va_start(args, fmt); 1625 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1626 fmt, args); 1627 va_end(args); 1628} 1629 1630void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1631 const char* exception_class_descriptor, 1632 const char* fmt, va_list ap) { 1633 std::string msg; 1634 StringAppendV(&msg, fmt, ap); 1635 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1636} 1637 1638void Thread::ThrowNewException(const ThrowLocation& throw_location, 1639 const char* exception_class_descriptor, 1640 const char* msg) { 1641 // Callers should either clear or call ThrowNewWrappedException. 1642 AssertNoPendingExceptionForNewException(msg); 1643 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1644} 1645 1646void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1647 const char* exception_class_descriptor, 1648 const char* msg) { 1649 DCHECK_EQ(this, Thread::Current()); 1650 ScopedObjectAccessUnchecked soa(this); 1651 StackHandleScope<5> hs(soa.Self()); 1652 // Ensure we don't forget arguments over object allocation. 1653 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1654 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1655 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1656 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1657 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1658 ClearException(); 1659 Runtime* runtime = Runtime::Current(); 1660 1661 mirror::ClassLoader* cl = nullptr; 1662 if (saved_throw_method.Get() != nullptr) { 1663 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1664 } 1665 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1666 Handle<mirror::Class> exception_class( 1667 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1668 class_loader))); 1669 if (UNLIKELY(exception_class.Get() == nullptr)) { 1670 CHECK(IsExceptionPending()); 1671 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1672 return; 1673 } 1674 1675 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(soa.Self(), exception_class, true, 1676 true))) { 1677 DCHECK(IsExceptionPending()); 1678 return; 1679 } 1680 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1681 Handle<mirror::Throwable> exception( 1682 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1683 1684 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1685 if (exception.Get() == nullptr) { 1686 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1687 throw_location.GetDexPc()); 1688 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1689 SetExceptionReportedToInstrumentation(is_exception_reported); 1690 return; 1691 } 1692 1693 // Choose an appropriate constructor and set up the arguments. 1694 const char* signature; 1695 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1696 if (msg != nullptr) { 1697 // Ensure we remember this and the method over the String allocation. 1698 msg_string.reset( 1699 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1700 if (UNLIKELY(msg_string.get() == nullptr)) { 1701 CHECK(IsExceptionPending()); // OOME. 1702 return; 1703 } 1704 if (cause.get() == nullptr) { 1705 signature = "(Ljava/lang/String;)V"; 1706 } else { 1707 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1708 } 1709 } else { 1710 if (cause.get() == nullptr) { 1711 signature = "()V"; 1712 } else { 1713 signature = "(Ljava/lang/Throwable;)V"; 1714 } 1715 } 1716 mirror::ArtMethod* exception_init_method = 1717 exception_class->FindDeclaredDirectMethod("<init>", signature); 1718 1719 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1720 << PrettyDescriptor(exception_class_descriptor); 1721 1722 if (UNLIKELY(!runtime->IsStarted())) { 1723 // Something is trying to throw an exception without a started runtime, which is the common 1724 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1725 // the exception fields directly. 1726 if (msg != nullptr) { 1727 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1728 } 1729 if (cause.get() != nullptr) { 1730 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1731 } 1732 ScopedLocalRef<jobject> trace(GetJniEnv(), 1733 Runtime::Current()->IsActiveTransaction() 1734 ? CreateInternalStackTrace<true>(soa) 1735 : CreateInternalStackTrace<false>(soa)); 1736 if (trace.get() != nullptr) { 1737 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1738 } 1739 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1740 throw_location.GetDexPc()); 1741 SetException(gc_safe_throw_location, exception.Get()); 1742 SetExceptionReportedToInstrumentation(is_exception_reported); 1743 } else { 1744 jvalue jv_args[2]; 1745 size_t i = 0; 1746 1747 if (msg != nullptr) { 1748 jv_args[i].l = msg_string.get(); 1749 ++i; 1750 } 1751 if (cause.get() != nullptr) { 1752 jv_args[i].l = cause.get(); 1753 ++i; 1754 } 1755 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1756 if (LIKELY(!IsExceptionPending())) { 1757 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1758 throw_location.GetDexPc()); 1759 SetException(gc_safe_throw_location, exception.Get()); 1760 SetExceptionReportedToInstrumentation(is_exception_reported); 1761 } 1762 } 1763} 1764 1765void Thread::ThrowOutOfMemoryError(const char* msg) { 1766 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1767 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1768 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1769 if (!tls32_.throwing_OutOfMemoryError) { 1770 tls32_.throwing_OutOfMemoryError = true; 1771 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1772 tls32_.throwing_OutOfMemoryError = false; 1773 } else { 1774 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1775 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1776 } 1777} 1778 1779Thread* Thread::CurrentFromGdb() { 1780 return Thread::Current(); 1781} 1782 1783void Thread::DumpFromGdb() const { 1784 std::ostringstream ss; 1785 Dump(ss); 1786 std::string str(ss.str()); 1787 // log to stderr for debugging command line processes 1788 std::cerr << str; 1789#ifdef HAVE_ANDROID_OS 1790 // log to logcat for debugging frameworks processes 1791 LOG(INFO) << str; 1792#endif 1793} 1794 1795// Explicitly instantiate 32 and 64bit thread offset dumping support. 1796template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1797template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1798 1799template<size_t ptr_size> 1800void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1801#define DO_THREAD_OFFSET(x, y) \ 1802 if (offset == x.Uint32Value()) { \ 1803 os << y; \ 1804 return; \ 1805 } 1806 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1807 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1808 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1809 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1810 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1811 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1812 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1813 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1814 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1815 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1816 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1817 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1818 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1819#undef DO_THREAD_OFFSET 1820 1821#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1822 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1823 os << #x; \ 1824 return; \ 1825 } 1826 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1827 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1828#undef INTERPRETER_ENTRY_POINT_INFO 1829 1830#define JNI_ENTRY_POINT_INFO(x) \ 1831 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1832 os << #x; \ 1833 return; \ 1834 } 1835 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1836#undef JNI_ENTRY_POINT_INFO 1837 1838#define PORTABLE_ENTRY_POINT_INFO(x) \ 1839 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1840 os << #x; \ 1841 return; \ 1842 } 1843 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1844 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1845 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1846#undef PORTABLE_ENTRY_POINT_INFO 1847 1848#define QUICK_ENTRY_POINT_INFO(x) \ 1849 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1850 os << #x; \ 1851 return; \ 1852 } 1853 QUICK_ENTRY_POINT_INFO(pAllocArray) 1854 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1855 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1856 QUICK_ENTRY_POINT_INFO(pAllocObject) 1857 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1858 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1859 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1860 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1861 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1862 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1863 QUICK_ENTRY_POINT_INFO(pCheckCast) 1864 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1865 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1866 QUICK_ENTRY_POINT_INFO(pInitializeType) 1867 QUICK_ENTRY_POINT_INFO(pResolveString) 1868 QUICK_ENTRY_POINT_INFO(pSet8Instance) 1869 QUICK_ENTRY_POINT_INFO(pSet8Static) 1870 QUICK_ENTRY_POINT_INFO(pSet16Instance) 1871 QUICK_ENTRY_POINT_INFO(pSet16Static) 1872 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1873 QUICK_ENTRY_POINT_INFO(pSet32Static) 1874 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1875 QUICK_ENTRY_POINT_INFO(pSet64Static) 1876 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1877 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1878 QUICK_ENTRY_POINT_INFO(pGetByteInstance) 1879 QUICK_ENTRY_POINT_INFO(pGetBooleanInstance) 1880 QUICK_ENTRY_POINT_INFO(pGetByteStatic) 1881 QUICK_ENTRY_POINT_INFO(pGetBooleanStatic) 1882 QUICK_ENTRY_POINT_INFO(pGetShortInstance) 1883 QUICK_ENTRY_POINT_INFO(pGetCharInstance) 1884 QUICK_ENTRY_POINT_INFO(pGetShortStatic) 1885 QUICK_ENTRY_POINT_INFO(pGetCharStatic) 1886 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1887 QUICK_ENTRY_POINT_INFO(pGet32Static) 1888 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1889 QUICK_ENTRY_POINT_INFO(pGet64Static) 1890 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1891 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1892 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1893 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1894 QUICK_ENTRY_POINT_INFO(pAputObject) 1895 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1896 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1897 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1898 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1899 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1900 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1901 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1902 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1903 QUICK_ENTRY_POINT_INFO(pLockObject) 1904 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1905 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1906 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1907 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1908 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1909 QUICK_ENTRY_POINT_INFO(pFmod) 1910 QUICK_ENTRY_POINT_INFO(pL2d) 1911 QUICK_ENTRY_POINT_INFO(pFmodf) 1912 QUICK_ENTRY_POINT_INFO(pL2f) 1913 QUICK_ENTRY_POINT_INFO(pD2iz) 1914 QUICK_ENTRY_POINT_INFO(pF2iz) 1915 QUICK_ENTRY_POINT_INFO(pIdivmod) 1916 QUICK_ENTRY_POINT_INFO(pD2l) 1917 QUICK_ENTRY_POINT_INFO(pF2l) 1918 QUICK_ENTRY_POINT_INFO(pLdiv) 1919 QUICK_ENTRY_POINT_INFO(pLmod) 1920 QUICK_ENTRY_POINT_INFO(pLmul) 1921 QUICK_ENTRY_POINT_INFO(pShlLong) 1922 QUICK_ENTRY_POINT_INFO(pShrLong) 1923 QUICK_ENTRY_POINT_INFO(pUshrLong) 1924 QUICK_ENTRY_POINT_INFO(pIndexOf) 1925 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1926 QUICK_ENTRY_POINT_INFO(pMemcpy) 1927 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1928 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1929 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1930 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1931 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1932 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1933 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1934 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1935 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1936 QUICK_ENTRY_POINT_INFO(pDeliverException) 1937 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1938 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1939 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1940 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1941 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1942 QUICK_ENTRY_POINT_INFO(pA64Load) 1943 QUICK_ENTRY_POINT_INFO(pA64Store) 1944#undef QUICK_ENTRY_POINT_INFO 1945 1946 os << offset; 1947} 1948 1949void Thread::QuickDeliverException() { 1950 // Get exception from thread. 1951 ThrowLocation throw_location; 1952 mirror::Throwable* exception = GetException(&throw_location); 1953 CHECK(exception != nullptr); 1954 // Don't leave exception visible while we try to find the handler, which may cause class 1955 // resolution. 1956 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1957 ClearException(); 1958 bool is_deoptimization = (exception == GetDeoptimizationException()); 1959 QuickExceptionHandler exception_handler(this, is_deoptimization); 1960 if (is_deoptimization) { 1961 exception_handler.DeoptimizeStack(); 1962 } else { 1963 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1964 } 1965 exception_handler.UpdateInstrumentationStack(); 1966 exception_handler.DoLongJump(); 1967 LOG(FATAL) << "UNREACHABLE"; 1968} 1969 1970Context* Thread::GetLongJumpContext() { 1971 Context* result = tlsPtr_.long_jump_context; 1972 if (result == nullptr) { 1973 result = Context::Create(); 1974 } else { 1975 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1976 result->Reset(); 1977 } 1978 return result; 1979} 1980 1981// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 1982// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 1983struct CurrentMethodVisitor FINAL : public StackVisitor { 1984 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 1985 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1986 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0), 1987 abort_on_error_(abort_on_error) {} 1988 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1989 mirror::ArtMethod* m = GetMethod(); 1990 if (m->IsRuntimeMethod()) { 1991 // Continue if this is a runtime method. 1992 return true; 1993 } 1994 if (context_ != nullptr) { 1995 this_object_ = GetThisObject(); 1996 } 1997 method_ = m; 1998 dex_pc_ = GetDexPc(abort_on_error_); 1999 return false; 2000 } 2001 mirror::Object* this_object_; 2002 mirror::ArtMethod* method_; 2003 uint32_t dex_pc_; 2004 const bool abort_on_error_; 2005}; 2006 2007mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 2008 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 2009 visitor.WalkStack(false); 2010 if (dex_pc != nullptr) { 2011 *dex_pc = visitor.dex_pc_; 2012 } 2013 return visitor.method_; 2014} 2015 2016ThrowLocation Thread::GetCurrentLocationForThrow() { 2017 Context* context = GetLongJumpContext(); 2018 CurrentMethodVisitor visitor(this, context, true); 2019 visitor.WalkStack(false); 2020 ReleaseLongJumpContext(context); 2021 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 2022} 2023 2024bool Thread::HoldsLock(mirror::Object* object) const { 2025 if (object == nullptr) { 2026 return false; 2027 } 2028 return object->GetLockOwnerThreadId() == GetThreadId(); 2029} 2030 2031// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2032template <typename RootVisitor> 2033class ReferenceMapVisitor : public StackVisitor { 2034 public: 2035 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 2036 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2037 : StackVisitor(thread, context), visitor_(visitor) {} 2038 2039 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2040 if (false) { 2041 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2042 << StringPrintf("@ PC:%04x", GetDexPc()); 2043 } 2044 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2045 if (shadow_frame != nullptr) { 2046 VisitShadowFrame(shadow_frame); 2047 } else { 2048 VisitQuickFrame(); 2049 } 2050 return true; 2051 } 2052 2053 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2054 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 2055 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 2056 mirror::ArtMethod* m = *method_addr; 2057 DCHECK(m != nullptr); 2058 size_t num_regs = shadow_frame->NumberOfVRegs(); 2059 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2060 // handle scope for JNI or References for interpreter. 2061 for (size_t reg = 0; reg < num_regs; ++reg) { 2062 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2063 if (ref != nullptr) { 2064 mirror::Object* new_ref = ref; 2065 visitor_(&new_ref, reg, this); 2066 if (new_ref != ref) { 2067 shadow_frame->SetVRegReference(reg, new_ref); 2068 } 2069 } 2070 } 2071 } else { 2072 // Java method. 2073 // Portable path use DexGcMap and store in Method.native_gc_map_. 2074 const uint8_t* gc_map = m->GetNativeGcMap(); 2075 CHECK(gc_map != nullptr) << PrettyMethod(m); 2076 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2077 uint32_t dex_pc = shadow_frame->GetDexPC(); 2078 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2079 DCHECK(reg_bitmap != nullptr); 2080 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2081 for (size_t reg = 0; reg < num_regs; ++reg) { 2082 if (TestBitmap(reg, reg_bitmap)) { 2083 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2084 if (ref != nullptr) { 2085 mirror::Object* new_ref = ref; 2086 visitor_(&new_ref, reg, this); 2087 if (new_ref != ref) { 2088 shadow_frame->SetVRegReference(reg, new_ref); 2089 } 2090 } 2091 } 2092 } 2093 } 2094 } 2095 2096 private: 2097 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2098 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2099 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2100 mirror::ArtMethod* old_method = m; 2101 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2102 if (m != old_method) { 2103 cur_quick_frame->Assign(m); 2104 } 2105 2106 // Process register map (which native and runtime methods don't have) 2107 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2108 if (m->IsOptimized()) { 2109 Runtime* runtime = Runtime::Current(); 2110 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2111 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2112 StackMap map = m->GetStackMap(native_pc_offset); 2113 MemoryRegion mask = map.GetStackMask(); 2114 for (size_t i = 0; i < mask.size_in_bits(); ++i) { 2115 if (mask.LoadBit(i)) { 2116 StackReference<mirror::Object>* ref_addr = 2117 reinterpret_cast<StackReference<mirror::Object>*>(cur_quick_frame) + i; 2118 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2119 if (ref != nullptr) { 2120 mirror::Object* new_ref = ref; 2121 visitor_(&new_ref, -1, this); 2122 if (ref != new_ref) { 2123 ref_addr->Assign(new_ref); 2124 } 2125 } 2126 } 2127 } 2128 } else { 2129 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2130 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2131 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2132 // Can't be nullptr or how would we compile its instructions? 2133 DCHECK(code_item != nullptr) << PrettyMethod(m); 2134 NativePcOffsetToReferenceMap map(native_gc_map); 2135 size_t num_regs = std::min(map.RegWidth() * 8, 2136 static_cast<size_t>(code_item->registers_size_)); 2137 if (num_regs > 0) { 2138 Runtime* runtime = Runtime::Current(); 2139 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2140 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2141 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2142 DCHECK(reg_bitmap != nullptr); 2143 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2144 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2145 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2146 // For all dex registers in the bitmap 2147 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2148 DCHECK(cur_quick_frame != nullptr); 2149 for (size_t reg = 0; reg < num_regs; ++reg) { 2150 // Does this register hold a reference? 2151 if (TestBitmap(reg, reg_bitmap)) { 2152 uint32_t vmap_offset; 2153 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2154 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2155 kReferenceVReg); 2156 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2157 mirror::Object** ref_addr = 2158 reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2159 if (*ref_addr != nullptr) { 2160 visitor_(ref_addr, reg, this); 2161 } 2162 } else { 2163 StackReference<mirror::Object>* ref_addr = 2164 reinterpret_cast<StackReference<mirror::Object>*>( 2165 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2166 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2167 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2168 if (ref != nullptr) { 2169 mirror::Object* new_ref = ref; 2170 visitor_(&new_ref, reg, this); 2171 if (ref != new_ref) { 2172 ref_addr->Assign(new_ref); 2173 } 2174 } 2175 } 2176 } 2177 } 2178 } 2179 } 2180 } 2181 } 2182 2183 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2184 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2185 } 2186 2187 // Visitor for when we visit a root. 2188 const RootVisitor& visitor_; 2189}; 2190 2191class RootCallbackVisitor { 2192 public: 2193 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2194 : callback_(callback), arg_(arg), tid_(tid) {} 2195 2196 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2197 callback_(obj, arg_, tid_, kRootJavaFrame); 2198 } 2199 2200 private: 2201 RootCallback* const callback_; 2202 void* const arg_; 2203 const uint32_t tid_; 2204}; 2205 2206void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2207 uint32_t thread_id = GetThreadId(); 2208 if (tlsPtr_.opeer != nullptr) { 2209 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2210 } 2211 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2212 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2213 } 2214 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2215 if (tlsPtr_.monitor_enter_object != nullptr) { 2216 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2217 } 2218 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2219 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2220 HandleScopeVisitRoots(visitor, arg, thread_id); 2221 if (tlsPtr_.debug_invoke_req != nullptr) { 2222 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2223 } 2224 if (tlsPtr_.single_step_control != nullptr) { 2225 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2226 } 2227 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2228 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2229 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2230 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2231 shadow_frame = shadow_frame->GetLink()) { 2232 mapper.VisitShadowFrame(shadow_frame); 2233 } 2234 } 2235 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2236 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2237 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2238 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2239 shadow_frame != nullptr; 2240 shadow_frame = shadow_frame->GetLink()) { 2241 mapper.VisitShadowFrame(shadow_frame); 2242 } 2243 } 2244 // Visit roots on this thread's stack 2245 Context* context = GetLongJumpContext(); 2246 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2247 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2248 mapper.WalkStack(); 2249 ReleaseLongJumpContext(context); 2250 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2251 if (frame.this_object_ != nullptr) { 2252 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2253 } 2254 DCHECK(frame.method_ != nullptr); 2255 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2256 } 2257} 2258 2259static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2260 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2261 VerifyObject(*root); 2262} 2263 2264void Thread::VerifyStackImpl() { 2265 std::unique_ptr<Context> context(Context::Create()); 2266 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2267 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2268 mapper.WalkStack(); 2269} 2270 2271// Set the stack end to that to be used during a stack overflow 2272void Thread::SetStackEndForStackOverflow() { 2273 // During stack overflow we allow use of the full stack. 2274 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2275 // However, we seem to have already extended to use the full stack. 2276 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2277 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2278 DumpStack(LOG(ERROR)); 2279 LOG(FATAL) << "Recursive stack overflow."; 2280 } 2281 2282 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2283 2284 // Remove the stack overflow protection if is it set up. 2285 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2286 if (implicit_stack_check) { 2287 if (!UnprotectStack()) { 2288 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2289 } 2290 } 2291} 2292 2293void Thread::SetTlab(uint8_t* start, uint8_t* end) { 2294 DCHECK_LE(start, end); 2295 tlsPtr_.thread_local_start = start; 2296 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2297 tlsPtr_.thread_local_end = end; 2298 tlsPtr_.thread_local_objects = 0; 2299} 2300 2301bool Thread::HasTlab() const { 2302 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2303 if (has_tlab) { 2304 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2305 } else { 2306 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2307 } 2308 return has_tlab; 2309} 2310 2311std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2312 thread.ShortDump(os); 2313 return os; 2314} 2315 2316void Thread::ProtectStack() { 2317 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2318 VLOG(threads) << "Protecting stack at " << pregion; 2319 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2320 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2321 "Reason: " 2322 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2323 } 2324} 2325 2326bool Thread::UnprotectStack() { 2327 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2328 VLOG(threads) << "Unprotecting stack at " << pregion; 2329 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2330} 2331 2332 2333} // namespace art 2334