thread.cc revision b8e087e0dfd619df90cbb56534478a60bc859ebf
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define ATRACE_TAG ATRACE_TAG_DALVIK 18 19#include "thread.h" 20 21#include <cutils/trace.h> 22#include <pthread.h> 23#include <signal.h> 24#include <sys/resource.h> 25#include <sys/time.h> 26 27#include <algorithm> 28#include <bitset> 29#include <cerrno> 30#include <iostream> 31#include <list> 32 33#include "arch/context.h" 34#include "base/mutex.h" 35#include "class_linker.h" 36#include "class_linker-inl.h" 37#include "debugger.h" 38#include "dex_file-inl.h" 39#include "entrypoints/entrypoint_utils.h" 40#include "entrypoints/quick/quick_alloc_entrypoints.h" 41#include "gc_map.h" 42#include "gc/accounting/card_table-inl.h" 43#include "gc/heap.h" 44#include "gc/space/space.h" 45#include "handle_scope.h" 46#include "indirect_reference_table-inl.h" 47#include "jni_internal.h" 48#include "mirror/art_field-inl.h" 49#include "mirror/art_method-inl.h" 50#include "mirror/class-inl.h" 51#include "mirror/class_loader.h" 52#include "mirror/object_array-inl.h" 53#include "mirror/stack_trace_element.h" 54#include "monitor.h" 55#include "object_utils.h" 56#include "quick_exception_handler.h" 57#include "quick/quick_method_frame_info.h" 58#include "reflection.h" 59#include "runtime.h" 60#include "scoped_thread_state_change.h" 61#include "ScopedLocalRef.h" 62#include "ScopedUtfChars.h" 63#include "handle_scope-inl.h" 64#include "stack.h" 65#include "thread-inl.h" 66#include "thread_list.h" 67#include "utils.h" 68#include "verifier/dex_gc_map.h" 69#include "verify_object-inl.h" 70#include "vmap_table.h" 71#include "well_known_classes.h" 72 73namespace art { 74 75bool Thread::is_started_ = false; 76pthread_key_t Thread::pthread_key_self_; 77ConditionVariable* Thread::resume_cond_ = nullptr; 78 79static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 80 81void Thread::InitCardTable() { 82 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 83} 84 85static void UnimplementedEntryPoint() { 86 UNIMPLEMENTED(FATAL); 87} 88 89void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 90 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 91 92void Thread::InitTlsEntryPoints() { 93 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 94 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 95 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + 96 sizeof(tlsPtr_.quick_entrypoints)); 97 for (uintptr_t* it = begin; it != end; ++it) { 98 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 99 } 100 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 101 &tlsPtr_.portable_entrypoints, &tlsPtr_.quick_entrypoints); 102} 103 104void Thread::ResetQuickAllocEntryPointsForThread() { 105 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 106} 107 108void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 109 tlsPtr_.deoptimization_shadow_frame = sf; 110} 111 112void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 113 tls64_.deoptimization_return_value.SetJ(ret_val.GetJ()); 114} 115 116ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 117 ShadowFrame* sf = tlsPtr_.deoptimization_shadow_frame; 118 tlsPtr_.deoptimization_shadow_frame = nullptr; 119 ret_val->SetJ(tls64_.deoptimization_return_value.GetJ()); 120 return sf; 121} 122 123void Thread::SetShadowFrameUnderConstruction(ShadowFrame* sf) { 124 sf->SetLink(tlsPtr_.shadow_frame_under_construction); 125 tlsPtr_.shadow_frame_under_construction = sf; 126} 127 128void Thread::ClearShadowFrameUnderConstruction() { 129 CHECK_NE(static_cast<ShadowFrame*>(nullptr), tlsPtr_.shadow_frame_under_construction); 130 tlsPtr_.shadow_frame_under_construction = tlsPtr_.shadow_frame_under_construction->GetLink(); 131} 132 133void Thread::InitTid() { 134 tls32_.tid = ::art::GetTid(); 135} 136 137void Thread::InitAfterFork() { 138 // One thread (us) survived the fork, but we have a new tid so we need to 139 // update the value stashed in this Thread*. 140 InitTid(); 141} 142 143void* Thread::CreateCallback(void* arg) { 144 Thread* self = reinterpret_cast<Thread*>(arg); 145 Runtime* runtime = Runtime::Current(); 146 if (runtime == nullptr) { 147 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 148 return nullptr; 149 } 150 { 151 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 152 // after self->Init(). 153 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 154 // Check that if we got here we cannot be shutting down (as shutdown should never have started 155 // while threads are being born). 156 CHECK(!runtime->IsShuttingDownLocked()); 157 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 158 Runtime::Current()->EndThreadBirth(); 159 } 160 { 161 ScopedObjectAccess soa(self); 162 163 // Copy peer into self, deleting global reference when done. 164 CHECK(self->tlsPtr_.jpeer != nullptr); 165 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 166 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 167 self->tlsPtr_.jpeer = nullptr; 168 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 169 Dbg::PostThreadStart(self); 170 171 // Invoke the 'run' method of our java.lang.Thread. 172 mirror::Object* receiver = self->tlsPtr_.opeer; 173 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 174 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 175 } 176 // Detach and delete self. 177 Runtime::Current()->GetThreadList()->Unregister(self); 178 179 return nullptr; 180} 181 182Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 183 mirror::Object* thread_peer) { 184 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 185 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 186 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 187 // to stop it from going away. 188 if (kIsDebugBuild) { 189 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 190 if (result != nullptr && !result->IsSuspended()) { 191 Locks::thread_list_lock_->AssertHeld(soa.Self()); 192 } 193 } 194 return result; 195} 196 197Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 198 jobject java_thread) { 199 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 200} 201 202static size_t FixStackSize(size_t stack_size) { 203 // A stack size of zero means "use the default". 204 if (stack_size == 0) { 205 stack_size = Runtime::Current()->GetDefaultStackSize(); 206 } 207 208 // Dalvik used the bionic pthread default stack size for native threads, 209 // so include that here to support apps that expect large native stacks. 210 stack_size += 1 * MB; 211 212 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 213 if (stack_size < PTHREAD_STACK_MIN) { 214 stack_size = PTHREAD_STACK_MIN; 215 } 216 217 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 218 // It's likely that callers are trying to ensure they have at least a certain amount of 219 // stack space, so we should add our reserved space on top of what they requested, rather 220 // than implicitly take it away from them. 221 stack_size += kRuntimeStackOverflowReservedBytes; 222 } else { 223 // If we are going to use implicit stack checks, allocate space for the protected 224 // region at the bottom of the stack. 225 stack_size += Thread::kStackOverflowImplicitCheckSize; 226 } 227 228 // Some systems require the stack size to be a multiple of the system page size, so round up. 229 stack_size = RoundUp(stack_size, kPageSize); 230 231 return stack_size; 232} 233 234// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 235// overflow is detected. It is located right below the stack_end_. Just below that 236// is the StackOverflow reserved region used when creating the StackOverflow 237// exception. 238void Thread::InstallImplicitProtection(bool is_main_stack) { 239 byte* pregion = tlsPtr_.stack_end; 240 241 constexpr uint32_t kMarker = 0xdadadada; 242 uintptr_t *marker = reinterpret_cast<uintptr_t*>(pregion); 243 if (*marker == kMarker) { 244 // The region has already been set up. 245 return; 246 } 247 // Add marker so that we can detect a second attempt to do this. 248 *marker = kMarker; 249 250 pregion -= kStackOverflowProtectedSize; 251 252 // Touch the pages in the region to map them in. Otherwise mprotect fails. Only 253 // need to do this on the main stack. We only need to touch one byte per page. 254 if (is_main_stack) { 255 byte* start = pregion; 256 byte* end = pregion + kStackOverflowProtectedSize; 257 while (start < end) { 258 *start = static_cast<byte>(0); 259 start += kPageSize; 260 } 261 } 262 263 VLOG(threads) << "installing stack protected region at " << std::hex << 264 static_cast<void*>(pregion) << " to " << 265 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 266 267 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 268 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. Reason:" 269 << strerror(errno); 270 } 271 272 // Tell the kernel that we won't be needing these pages any more. 273 if (is_main_stack) { 274 madvise(pregion, kStackOverflowProtectedSize, MADV_DONTNEED); 275 } 276} 277 278void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 279 CHECK(java_peer != nullptr); 280 Thread* self = static_cast<JNIEnvExt*>(env)->self; 281 Runtime* runtime = Runtime::Current(); 282 283 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 284 bool thread_start_during_shutdown = false; 285 { 286 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 287 if (runtime->IsShuttingDownLocked()) { 288 thread_start_during_shutdown = true; 289 } else { 290 runtime->StartThreadBirth(); 291 } 292 } 293 if (thread_start_during_shutdown) { 294 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 295 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 296 return; 297 } 298 299 Thread* child_thread = new Thread(is_daemon); 300 // Use global JNI ref to hold peer live while child thread starts. 301 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 302 stack_size = FixStackSize(stack_size); 303 304 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 305 // assign it. 306 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 307 reinterpret_cast<jlong>(child_thread)); 308 309 pthread_t new_pthread; 310 pthread_attr_t attr; 311 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 312 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 313 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 314 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 315 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 316 317 if (pthread_create_result != 0) { 318 // pthread_create(3) failed, so clean up. 319 { 320 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 321 runtime->EndThreadBirth(); 322 } 323 // Manually delete the global reference since Thread::Init will not have been run. 324 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 325 child_thread->tlsPtr_.jpeer = nullptr; 326 delete child_thread; 327 child_thread = nullptr; 328 // TODO: remove from thread group? 329 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 330 { 331 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 332 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 333 ScopedObjectAccess soa(env); 334 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 335 } 336 } 337} 338 339void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 340 // This function does all the initialization that must be run by the native thread it applies to. 341 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 342 // we can handshake with the corresponding native thread when it's ready.) Check this native 343 // thread hasn't been through here already... 344 CHECK(Thread::Current() == nullptr); 345 SetUpAlternateSignalStack(); 346 InitCpu(); 347 InitTlsEntryPoints(); 348 RemoveSuspendTrigger(); 349 InitCardTable(); 350 InitTid(); 351 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 352 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 353 tlsPtr_.pthread_self = pthread_self(); 354 CHECK(is_started_); 355 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 356 DCHECK_EQ(Thread::Current(), this); 357 358 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 359 InitStackHwm(); 360 361 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 362 thread_list->Register(this); 363} 364 365Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 366 bool create_peer) { 367 Thread* self; 368 Runtime* runtime = Runtime::Current(); 369 if (runtime == nullptr) { 370 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 371 return nullptr; 372 } 373 { 374 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 375 if (runtime->IsShuttingDownLocked()) { 376 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 377 return nullptr; 378 } else { 379 Runtime::Current()->StartThreadBirth(); 380 self = new Thread(as_daemon); 381 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 382 Runtime::Current()->EndThreadBirth(); 383 } 384 } 385 386 CHECK_NE(self->GetState(), kRunnable); 387 self->SetState(kNative); 388 389 // If we're the main thread, ClassLinker won't be created until after we're attached, 390 // so that thread needs a two-stage attach. Regular threads don't need this hack. 391 // In the compiler, all threads need this hack, because no-one's going to be getting 392 // a native peer! 393 if (create_peer) { 394 self->CreatePeer(thread_name, as_daemon, thread_group); 395 } else { 396 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 397 if (thread_name != nullptr) { 398 self->tlsPtr_.name->assign(thread_name); 399 ::art::SetThreadName(thread_name); 400 } 401 } 402 403 return self; 404} 405 406void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 407 Runtime* runtime = Runtime::Current(); 408 CHECK(runtime->IsStarted()); 409 JNIEnv* env = tlsPtr_.jni_env; 410 411 if (thread_group == nullptr) { 412 thread_group = runtime->GetMainThreadGroup(); 413 } 414 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 415 jint thread_priority = GetNativePriority(); 416 jboolean thread_is_daemon = as_daemon; 417 418 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 419 if (peer.get() == nullptr) { 420 CHECK(IsExceptionPending()); 421 return; 422 } 423 { 424 ScopedObjectAccess soa(this); 425 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 426 } 427 env->CallNonvirtualVoidMethod(peer.get(), 428 WellKnownClasses::java_lang_Thread, 429 WellKnownClasses::java_lang_Thread_init, 430 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 431 AssertNoPendingException(); 432 433 Thread* self = this; 434 DCHECK_EQ(self, Thread::Current()); 435 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 436 reinterpret_cast<jlong>(self)); 437 438 ScopedObjectAccess soa(self); 439 StackHandleScope<1> hs(self); 440 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 441 if (peer_thread_name.Get() == nullptr) { 442 // The Thread constructor should have set the Thread.name to a 443 // non-null value. However, because we can run without code 444 // available (in the compiler, in tests), we manually assign the 445 // fields the constructor should have set. 446 if (runtime->IsActiveTransaction()) { 447 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 448 } else { 449 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 450 } 451 peer_thread_name.Assign(GetThreadName(soa)); 452 } 453 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 454 if (peer_thread_name.Get() != nullptr) { 455 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 456 } 457} 458 459template<bool kTransactionActive> 460void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 461 jobject thread_name, jint thread_priority) { 462 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 463 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 464 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 465 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 466 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 467 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 468 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 469 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 470} 471 472void Thread::SetThreadName(const char* name) { 473 tlsPtr_.name->assign(name); 474 ::art::SetThreadName(name); 475 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 476} 477 478void Thread::InitStackHwm() { 479 void* read_stack_base; 480 size_t read_stack_size; 481 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 482 483 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 484 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 485 PrettySize(read_stack_size).c_str()); 486 487 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 488 tlsPtr_.stack_size = read_stack_size; 489 490 if (read_stack_size <= kRuntimeStackOverflowReservedBytes) { 491 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 492 << " bytes)"; 493 } 494 495 // TODO: move this into the Linux GetThreadStack implementation. 496#if defined(__APPLE__) 497 bool is_main_thread = false; 498#else 499 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 500 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 501 // will be broken because we'll die long before we get close to 2GB. 502 bool is_main_thread = (::art::GetTid() == getpid()); 503 if (is_main_thread) { 504 rlimit stack_limit; 505 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 506 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 507 } 508 if (stack_limit.rlim_cur == RLIM_INFINITY) { 509 // Find the default stack size for new threads... 510 pthread_attr_t default_attributes; 511 size_t default_stack_size; 512 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 513 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 514 "default stack size query"); 515 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 516 517 // ...and use that as our limit. 518 size_t old_stack_size = read_stack_size; 519 tlsPtr_.stack_size = default_stack_size; 520 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 521 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 522 << " to " << PrettySize(default_stack_size) 523 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 524 } 525 } 526#endif 527 528 // Set stack_end_ to the bottom of the stack saving space of stack overflows 529 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 530 ResetDefaultStackEnd(implicit_stack_check); 531 532 // Install the protected region if we are doing implicit overflow checks. 533 if (implicit_stack_check) { 534 if (is_main_thread) { 535 // The main thread has a 16K protected region at the bottom. We need 536 // to install our own region so we need to move the limits 537 // of the stack to make room for it. 538 constexpr uint32_t kDelta = 16 * KB; 539 tlsPtr_.stack_begin += kDelta; 540 tlsPtr_.stack_end += kDelta; 541 tlsPtr_.stack_size -= kDelta; 542 } 543 InstallImplicitProtection(is_main_thread); 544 } 545 546 // Sanity check. 547 int stack_variable; 548 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 549} 550 551void Thread::ShortDump(std::ostream& os) const { 552 os << "Thread["; 553 if (GetThreadId() != 0) { 554 // If we're in kStarting, we won't have a thin lock id or tid yet. 555 os << GetThreadId() 556 << ",tid=" << GetTid() << ','; 557 } 558 os << GetState() 559 << ",Thread*=" << this 560 << ",peer=" << tlsPtr_.opeer 561 << ",\"" << *tlsPtr_.name << "\"" 562 << "]"; 563} 564 565void Thread::Dump(std::ostream& os) const { 566 DumpState(os); 567 DumpStack(os); 568} 569 570mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 571 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 572 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 573} 574 575void Thread::GetThreadName(std::string& name) const { 576 name.assign(*tlsPtr_.name); 577} 578 579uint64_t Thread::GetCpuMicroTime() const { 580#if defined(HAVE_POSIX_CLOCKS) 581 clockid_t cpu_clock_id; 582 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 583 timespec now; 584 clock_gettime(cpu_clock_id, &now); 585 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 586#else 587 UNIMPLEMENTED(WARNING); 588 return -1; 589#endif 590} 591 592void Thread::AtomicSetFlag(ThreadFlag flag) { 593 android_atomic_or(flag, &tls32_.state_and_flags.as_int); 594} 595 596void Thread::AtomicClearFlag(ThreadFlag flag) { 597 android_atomic_and(-1 ^ flag, &tls32_.state_and_flags.as_int); 598} 599 600// Attempt to rectify locks so that we dump thread list with required locks before exiting. 601static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 602 LOG(ERROR) << *thread << " suspend count already zero."; 603 Locks::thread_suspend_count_lock_->Unlock(self); 604 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 605 Locks::mutator_lock_->SharedTryLock(self); 606 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 607 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 608 } 609 } 610 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 611 Locks::thread_list_lock_->TryLock(self); 612 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 613 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 614 } 615 } 616 std::ostringstream ss; 617 Runtime::Current()->GetThreadList()->DumpLocked(ss); 618 LOG(FATAL) << ss.str(); 619} 620 621void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 622 if (kIsDebugBuild) { 623 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 624 << delta << " " << tls32_.debug_suspend_count << " " << this; 625 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 626 Locks::thread_suspend_count_lock_->AssertHeld(self); 627 if (this != self && !IsSuspended()) { 628 Locks::thread_list_lock_->AssertHeld(self); 629 } 630 } 631 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 632 UnsafeLogFatalForSuspendCount(self, this); 633 return; 634 } 635 636 tls32_.suspend_count += delta; 637 if (for_debugger) { 638 tls32_.debug_suspend_count += delta; 639 } 640 641 if (tls32_.suspend_count == 0) { 642 AtomicClearFlag(kSuspendRequest); 643 } else { 644 AtomicSetFlag(kSuspendRequest); 645 TriggerSuspend(); 646 } 647} 648 649void Thread::RunCheckpointFunction() { 650 Closure *checkpoints[kMaxCheckpoints]; 651 652 // Grab the suspend_count lock and copy the current set of 653 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 654 // function will also grab this lock so we prevent a race between setting 655 // the kCheckpointRequest flag and clearing it. 656 { 657 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 658 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 659 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 660 tlsPtr_.checkpoint_functions[i] = nullptr; 661 } 662 AtomicClearFlag(kCheckpointRequest); 663 } 664 665 // Outside the lock, run all the checkpoint functions that 666 // we collected. 667 bool found_checkpoint = false; 668 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 669 if (checkpoints[i] != nullptr) { 670 ATRACE_BEGIN("Checkpoint function"); 671 checkpoints[i]->Run(this); 672 ATRACE_END(); 673 found_checkpoint = true; 674 } 675 } 676 CHECK(found_checkpoint); 677} 678 679bool Thread::RequestCheckpoint(Closure* function) { 680 union StateAndFlags old_state_and_flags; 681 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 682 if (old_state_and_flags.as_struct.state != kRunnable) { 683 return false; // Fail, thread is suspended and so can't run a checkpoint. 684 } 685 686 uint32_t available_checkpoint = kMaxCheckpoints; 687 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 688 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 689 available_checkpoint = i; 690 break; 691 } 692 } 693 if (available_checkpoint == kMaxCheckpoints) { 694 // No checkpoint functions available, we can't run a checkpoint 695 return false; 696 } 697 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 698 699 // Checkpoint function installed now install flag bit. 700 // We must be runnable to request a checkpoint. 701 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 702 union StateAndFlags new_state_and_flags; 703 new_state_and_flags.as_int = old_state_and_flags.as_int; 704 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 705 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 706 &tls32_.state_and_flags.as_int); 707 if (UNLIKELY(succeeded != 0)) { 708 // The thread changed state before the checkpoint was installed. 709 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 710 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 711 } else { 712 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 713 TriggerSuspend(); 714 } 715 return succeeded == 0; 716} 717 718void Thread::FullSuspendCheck() { 719 VLOG(threads) << this << " self-suspending"; 720 ATRACE_BEGIN("Full suspend check"); 721 // Make thread appear suspended to other threads, release mutator_lock_. 722 TransitionFromRunnableToSuspended(kSuspended); 723 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 724 TransitionFromSuspendedToRunnable(); 725 ATRACE_END(); 726 VLOG(threads) << this << " self-reviving"; 727} 728 729void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 730 std::string group_name; 731 int priority; 732 bool is_daemon = false; 733 Thread* self = Thread::Current(); 734 735 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 736 // cause ScopedObjectAccessUnchecked to deadlock. 737 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 738 ScopedObjectAccessUnchecked soa(self); 739 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 740 ->GetInt(thread->tlsPtr_.opeer); 741 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 742 ->GetBoolean(thread->tlsPtr_.opeer); 743 744 mirror::Object* thread_group = 745 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 746 747 if (thread_group != nullptr) { 748 mirror::ArtField* group_name_field = 749 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 750 mirror::String* group_name_string = 751 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 752 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 753 } 754 } else { 755 priority = GetNativePriority(); 756 } 757 758 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 759 if (scheduler_group_name.empty()) { 760 scheduler_group_name = "default"; 761 } 762 763 if (thread != nullptr) { 764 os << '"' << *thread->tlsPtr_.name << '"'; 765 if (is_daemon) { 766 os << " daemon"; 767 } 768 os << " prio=" << priority 769 << " tid=" << thread->GetThreadId() 770 << " " << thread->GetState(); 771 if (thread->IsStillStarting()) { 772 os << " (still starting up)"; 773 } 774 os << "\n"; 775 } else { 776 os << '"' << ::art::GetThreadName(tid) << '"' 777 << " prio=" << priority 778 << " (not attached)\n"; 779 } 780 781 if (thread != nullptr) { 782 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 783 os << " | group=\"" << group_name << "\"" 784 << " sCount=" << thread->tls32_.suspend_count 785 << " dsCount=" << thread->tls32_.debug_suspend_count 786 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 787 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 788 } 789 790 os << " | sysTid=" << tid 791 << " nice=" << getpriority(PRIO_PROCESS, tid) 792 << " cgrp=" << scheduler_group_name; 793 if (thread != nullptr) { 794 int policy; 795 sched_param sp; 796 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 797 __FUNCTION__); 798 os << " sched=" << policy << "/" << sp.sched_priority 799 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 800 } 801 os << "\n"; 802 803 // Grab the scheduler stats for this thread. 804 std::string scheduler_stats; 805 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 806 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 807 } else { 808 scheduler_stats = "0 0 0"; 809 } 810 811 char native_thread_state = '?'; 812 int utime = 0; 813 int stime = 0; 814 int task_cpu = 0; 815 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 816 817 os << " | state=" << native_thread_state 818 << " schedstat=( " << scheduler_stats << " )" 819 << " utm=" << utime 820 << " stm=" << stime 821 << " core=" << task_cpu 822 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 823 if (thread != nullptr) { 824 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 825 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 826 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 827 // Dump the held mutexes. 828 os << " | held mutexes="; 829 for (size_t i = 0; i < kLockLevelCount; ++i) { 830 if (i != kMonitorLock) { 831 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 832 if (mutex != nullptr) { 833 os << " \"" << mutex->GetName() << "\""; 834 if (mutex->IsReaderWriterMutex()) { 835 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 836 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 837 os << "(exclusive held)"; 838 } else { 839 os << "(shared held)"; 840 } 841 } 842 } 843 } 844 } 845 os << "\n"; 846 } 847} 848 849void Thread::DumpState(std::ostream& os) const { 850 Thread::DumpState(os, this, GetTid()); 851} 852 853struct StackDumpVisitor : public StackVisitor { 854 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 855 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 856 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 857 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 858 } 859 860 virtual ~StackDumpVisitor() { 861 if (frame_count == 0) { 862 os << " (no managed stack frames)\n"; 863 } 864 } 865 866 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 867 mirror::ArtMethod* m = GetMethod(); 868 if (m->IsRuntimeMethod()) { 869 return true; 870 } 871 const int kMaxRepetition = 3; 872 mirror::Class* c = m->GetDeclaringClass(); 873 mirror::DexCache* dex_cache = c->GetDexCache(); 874 int line_number = -1; 875 if (dex_cache != nullptr) { // be tolerant of bad input 876 const DexFile& dex_file = *dex_cache->GetDexFile(); 877 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 878 } 879 if (line_number == last_line_number && last_method == m) { 880 ++repetition_count; 881 } else { 882 if (repetition_count >= kMaxRepetition) { 883 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 884 } 885 repetition_count = 0; 886 last_line_number = line_number; 887 last_method = m; 888 } 889 if (repetition_count < kMaxRepetition) { 890 os << " at " << PrettyMethod(m, false); 891 if (m->IsNative()) { 892 os << "(Native method)"; 893 } else { 894 const char* source_file(m->GetDeclaringClassSourceFile()); 895 os << "(" << (source_file != nullptr ? source_file : "unavailable") 896 << ":" << line_number << ")"; 897 } 898 os << "\n"; 899 if (frame_count == 0) { 900 Monitor::DescribeWait(os, thread); 901 } 902 if (can_allocate) { 903 Monitor::VisitLocks(this, DumpLockedObject, &os); 904 } 905 } 906 907 ++frame_count; 908 return true; 909 } 910 911 static void DumpLockedObject(mirror::Object* o, void* context) 912 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 913 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 914 os << " - locked "; 915 if (o == nullptr) { 916 os << "an unknown object"; 917 } else { 918 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 919 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 920 // Getting the identity hashcode here would result in lock inflation and suspension of the 921 // current thread, which isn't safe if this is the only runnable thread. 922 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 923 PrettyTypeOf(o).c_str()); 924 } else { 925 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 926 } 927 } 928 os << "\n"; 929 } 930 931 std::ostream& os; 932 const Thread* thread; 933 const bool can_allocate; 934 mirror::ArtMethod* method; 935 mirror::ArtMethod* last_method; 936 int last_line_number; 937 int repetition_count; 938 int frame_count; 939}; 940 941static bool ShouldShowNativeStack(const Thread* thread) 942 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 943 ThreadState state = thread->GetState(); 944 945 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 946 if (state > kWaiting && state < kStarting) { 947 return true; 948 } 949 950 // In an Object.wait variant or Thread.sleep? That's not interesting. 951 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 952 return false; 953 } 954 955 // In some other native method? That's interesting. 956 // We don't just check kNative because native methods will be in state kSuspended if they're 957 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 958 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 959 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 960 return current_method != nullptr && current_method->IsNative(); 961} 962 963void Thread::DumpJavaStack(std::ostream& os) const { 964 std::unique_ptr<Context> context(Context::Create()); 965 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 966 !tls32_.throwing_OutOfMemoryError); 967 dumper.WalkStack(); 968} 969 970void Thread::DumpStack(std::ostream& os) const { 971 // TODO: we call this code when dying but may not have suspended the thread ourself. The 972 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 973 // the race with the thread_suspend_count_lock_). 974 bool dump_for_abort = (gAborting > 0); 975 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 976 if (!kIsDebugBuild) { 977 // We always want to dump the stack for an abort, however, there is no point dumping another 978 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 979 safe_to_dump = (safe_to_dump || dump_for_abort); 980 } 981 if (safe_to_dump) { 982 // If we're currently in native code, dump that stack before dumping the managed stack. 983 if (dump_for_abort || ShouldShowNativeStack(this)) { 984 DumpKernelStack(os, GetTid(), " kernel: ", false); 985 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr)); 986 } 987 DumpJavaStack(os); 988 } else { 989 os << "Not able to dump stack of thread that isn't suspended"; 990 } 991} 992 993void Thread::ThreadExitCallback(void* arg) { 994 Thread* self = reinterpret_cast<Thread*>(arg); 995 if (self->tls32_.thread_exit_check_count == 0) { 996 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 997 "going to use a pthread_key_create destructor?): " << *self; 998 CHECK(is_started_); 999 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1000 self->tls32_.thread_exit_check_count = 1; 1001 } else { 1002 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1003 } 1004} 1005 1006void Thread::Startup() { 1007 CHECK(!is_started_); 1008 is_started_ = true; 1009 { 1010 // MutexLock to keep annotalysis happy. 1011 // 1012 // Note we use nullptr for the thread because Thread::Current can 1013 // return garbage since (is_started_ == true) and 1014 // Thread::pthread_key_self_ is not yet initialized. 1015 // This was seen on glibc. 1016 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1017 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1018 *Locks::thread_suspend_count_lock_); 1019 } 1020 1021 // Allocate a TLS slot. 1022 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1023 1024 // Double-check the TLS slot allocation. 1025 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1026 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1027 } 1028} 1029 1030void Thread::FinishStartup() { 1031 Runtime* runtime = Runtime::Current(); 1032 CHECK(runtime->IsStarted()); 1033 1034 // Finish attaching the main thread. 1035 ScopedObjectAccess soa(Thread::Current()); 1036 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1037 1038 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1039} 1040 1041void Thread::Shutdown() { 1042 CHECK(is_started_); 1043 is_started_ = false; 1044 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1045 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1046 if (resume_cond_ != nullptr) { 1047 delete resume_cond_; 1048 resume_cond_ = nullptr; 1049 } 1050} 1051 1052Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1053 wait_mutex_ = new Mutex("a thread wait mutex"); 1054 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1055 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1056 tlsPtr_.single_step_control = new SingleStepControl; 1057 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1058 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1059 1060 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1061 tls32_.state_and_flags.as_struct.flags = 0; 1062 tls32_.state_and_flags.as_struct.state = kNative; 1063 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1064 std::fill(tlsPtr_.rosalloc_runs, 1065 tlsPtr_.rosalloc_runs + gc::allocator::RosAlloc::kNumThreadLocalSizeBrackets, 1066 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1067 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1068 tlsPtr_.checkpoint_functions[i] = nullptr; 1069 } 1070} 1071 1072bool Thread::IsStillStarting() const { 1073 // You might think you can check whether the state is kStarting, but for much of thread startup, 1074 // the thread is in kNative; it might also be in kVmWait. 1075 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1076 // assigned fairly early on, and needs to be. 1077 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1078 // this thread _ever_ entered kRunnable". 1079 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1080 (*tlsPtr_.name == kThreadNameDuringStartup); 1081} 1082 1083void Thread::AssertNoPendingException() const { 1084 if (UNLIKELY(IsExceptionPending())) { 1085 ScopedObjectAccess soa(Thread::Current()); 1086 mirror::Throwable* exception = GetException(nullptr); 1087 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1088 } 1089} 1090 1091void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1092 if (UNLIKELY(IsExceptionPending())) { 1093 ScopedObjectAccess soa(Thread::Current()); 1094 mirror::Throwable* exception = GetException(nullptr); 1095 LOG(FATAL) << "Throwing new exception " << msg << " with unexpected pending exception: " 1096 << exception->Dump(); 1097 } 1098} 1099 1100static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1101 RootType /*root_type*/) 1102 NO_THREAD_SAFETY_ANALYSIS { 1103 Thread* self = reinterpret_cast<Thread*>(arg); 1104 mirror::Object* entered_monitor = *object; 1105 if (self->HoldsLock(entered_monitor)) { 1106 LOG(WARNING) << "Calling MonitorExit on object " 1107 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1108 << " left locked by native thread " 1109 << *Thread::Current() << " which is detaching"; 1110 entered_monitor->MonitorExit(self); 1111 } 1112} 1113 1114void Thread::Destroy() { 1115 Thread* self = this; 1116 DCHECK_EQ(self, Thread::Current()); 1117 1118 if (tlsPtr_.opeer != nullptr) { 1119 ScopedObjectAccess soa(self); 1120 // We may need to call user-supplied managed code, do this before final clean-up. 1121 HandleUncaughtExceptions(soa); 1122 RemoveFromThreadGroup(soa); 1123 1124 // this.nativePeer = 0; 1125 if (Runtime::Current()->IsActiveTransaction()) { 1126 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1127 ->SetLong<true>(tlsPtr_.opeer, 0); 1128 } else { 1129 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1130 ->SetLong<false>(tlsPtr_.opeer, 0); 1131 } 1132 Dbg::PostThreadDeath(self); 1133 1134 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1135 // who is waiting. 1136 mirror::Object* lock = 1137 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1138 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1139 if (lock != nullptr) { 1140 StackHandleScope<1> hs(self); 1141 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1142 ObjectLock<mirror::Object> locker(self, h_obj); 1143 locker.NotifyAll(); 1144 } 1145 } 1146 1147 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1148 if (tlsPtr_.jni_env != nullptr) { 1149 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1150 } 1151} 1152 1153Thread::~Thread() { 1154 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1155 // If pthread_create fails we don't have a jni env here. 1156 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1157 tlsPtr_.jpeer = nullptr; 1158 } 1159 tlsPtr_.opeer = nullptr; 1160 1161 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1162 if (initialized) { 1163 delete tlsPtr_.jni_env; 1164 tlsPtr_.jni_env = nullptr; 1165 } 1166 CHECK_NE(GetState(), kRunnable); 1167 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1168 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1169 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1170 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1171 1172 // We may be deleting a still born thread. 1173 SetStateUnsafe(kTerminated); 1174 1175 delete wait_cond_; 1176 delete wait_mutex_; 1177 1178 if (tlsPtr_.long_jump_context != nullptr) { 1179 delete tlsPtr_.long_jump_context; 1180 } 1181 1182 if (initialized) { 1183 CleanupCpu(); 1184 } 1185 1186 delete tlsPtr_.debug_invoke_req; 1187 delete tlsPtr_.single_step_control; 1188 delete tlsPtr_.instrumentation_stack; 1189 delete tlsPtr_.name; 1190 delete tlsPtr_.stack_trace_sample; 1191 1192 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1193 1194 TearDownAlternateSignalStack(); 1195} 1196 1197void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1198 if (!IsExceptionPending()) { 1199 return; 1200 } 1201 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1202 ScopedThreadStateChange tsc(this, kNative); 1203 1204 // Get and clear the exception. 1205 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1206 tlsPtr_.jni_env->ExceptionClear(); 1207 1208 // If the thread has its own handler, use that. 1209 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1210 tlsPtr_.jni_env->GetObjectField(peer.get(), 1211 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1212 if (handler.get() == nullptr) { 1213 // Otherwise use the thread group's default handler. 1214 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1215 WellKnownClasses::java_lang_Thread_group)); 1216 } 1217 1218 // Call the handler. 1219 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1220 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1221 peer.get(), exception.get()); 1222 1223 // If the handler threw, clear that exception too. 1224 tlsPtr_.jni_env->ExceptionClear(); 1225} 1226 1227void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1228 // this.group.removeThread(this); 1229 // group can be null if we're in the compiler or a test. 1230 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1231 ->GetObject(tlsPtr_.opeer); 1232 if (ogroup != nullptr) { 1233 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1234 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1235 ScopedThreadStateChange tsc(soa.Self(), kNative); 1236 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1237 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1238 peer.get()); 1239 } 1240} 1241 1242size_t Thread::NumHandleReferences() { 1243 size_t count = 0; 1244 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1245 count += cur->NumberOfReferences(); 1246 } 1247 return count; 1248} 1249 1250bool Thread::HandleScopeContains(jobject obj) const { 1251 StackReference<mirror::Object>* hs_entry = 1252 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1253 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1254 if (cur->Contains(hs_entry)) { 1255 return true; 1256 } 1257 } 1258 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1259 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1260} 1261 1262void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1263 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1264 size_t num_refs = cur->NumberOfReferences(); 1265 for (size_t j = 0; j < num_refs; ++j) { 1266 mirror::Object* object = cur->GetReference(j); 1267 if (object != nullptr) { 1268 mirror::Object* old_obj = object; 1269 visitor(&object, arg, thread_id, kRootNativeStack); 1270 if (old_obj != object) { 1271 cur->SetReference(j, object); 1272 } 1273 } 1274 } 1275 } 1276} 1277 1278mirror::Object* Thread::DecodeJObject(jobject obj) const { 1279 Locks::mutator_lock_->AssertSharedHeld(this); 1280 if (obj == nullptr) { 1281 return nullptr; 1282 } 1283 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1284 IndirectRefKind kind = GetIndirectRefKind(ref); 1285 mirror::Object* result; 1286 // The "kinds" below are sorted by the frequency we expect to encounter them. 1287 if (kind == kLocal) { 1288 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1289 // Local references do not need a read barrier. 1290 result = locals.Get<kWithoutReadBarrier>(ref); 1291 } else if (kind == kHandleScopeOrInvalid) { 1292 // TODO: make stack indirect reference table lookup more efficient. 1293 // Check if this is a local reference in the handle scope. 1294 if (LIKELY(HandleScopeContains(obj))) { 1295 // Read from handle scope. 1296 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1297 VerifyObject(result); 1298 } else { 1299 result = kInvalidIndirectRefObject; 1300 } 1301 } else if (kind == kGlobal) { 1302 JavaVMExt* const vm = Runtime::Current()->GetJavaVM(); 1303 result = vm->globals.SynchronizedGet(const_cast<Thread*>(this), &vm->globals_lock, ref); 1304 } else { 1305 DCHECK_EQ(kind, kWeakGlobal); 1306 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1307 if (result == kClearedJniWeakGlobal) { 1308 // This is a special case where it's okay to return nullptr. 1309 return nullptr; 1310 } 1311 } 1312 1313 if (UNLIKELY(result == nullptr)) { 1314 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1315 } 1316 return result; 1317} 1318 1319// Implements java.lang.Thread.interrupted. 1320bool Thread::Interrupted() { 1321 MutexLock mu(Thread::Current(), *wait_mutex_); 1322 bool interrupted = IsInterruptedLocked(); 1323 SetInterruptedLocked(false); 1324 return interrupted; 1325} 1326 1327// Implements java.lang.Thread.isInterrupted. 1328bool Thread::IsInterrupted() { 1329 MutexLock mu(Thread::Current(), *wait_mutex_); 1330 return IsInterruptedLocked(); 1331} 1332 1333void Thread::Interrupt(Thread* self) { 1334 MutexLock mu(self, *wait_mutex_); 1335 if (interrupted_) { 1336 return; 1337 } 1338 interrupted_ = true; 1339 NotifyLocked(self); 1340} 1341 1342void Thread::Notify() { 1343 Thread* self = Thread::Current(); 1344 MutexLock mu(self, *wait_mutex_); 1345 NotifyLocked(self); 1346} 1347 1348void Thread::NotifyLocked(Thread* self) { 1349 if (wait_monitor_ != nullptr) { 1350 wait_cond_->Signal(self); 1351 } 1352} 1353 1354class CountStackDepthVisitor : public StackVisitor { 1355 public: 1356 explicit CountStackDepthVisitor(Thread* thread) 1357 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1358 : StackVisitor(thread, nullptr), 1359 depth_(0), skip_depth_(0), skipping_(true) {} 1360 1361 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1362 // We want to skip frames up to and including the exception's constructor. 1363 // Note we also skip the frame if it doesn't have a method (namely the callee 1364 // save frame) 1365 mirror::ArtMethod* m = GetMethod(); 1366 if (skipping_ && !m->IsRuntimeMethod() && 1367 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1368 skipping_ = false; 1369 } 1370 if (!skipping_) { 1371 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1372 ++depth_; 1373 } 1374 } else { 1375 ++skip_depth_; 1376 } 1377 return true; 1378 } 1379 1380 int GetDepth() const { 1381 return depth_; 1382 } 1383 1384 int GetSkipDepth() const { 1385 return skip_depth_; 1386 } 1387 1388 private: 1389 uint32_t depth_; 1390 uint32_t skip_depth_; 1391 bool skipping_; 1392}; 1393 1394template<bool kTransactionActive> 1395class BuildInternalStackTraceVisitor : public StackVisitor { 1396 public: 1397 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1398 : StackVisitor(thread, nullptr), self_(self), 1399 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1400 1401 bool Init(int depth) 1402 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1403 // Allocate method trace with an extra slot that will hold the PC trace 1404 StackHandleScope<1> hs(self_); 1405 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1406 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1407 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1408 if (method_trace.Get() == nullptr) { 1409 return false; 1410 } 1411 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1412 if (dex_pc_trace == nullptr) { 1413 return false; 1414 } 1415 // Save PC trace in last element of method trace, also places it into the 1416 // object graph. 1417 // We are called from native: use non-transactional mode. 1418 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1419 // Set the Object*s and assert that no thread suspension is now possible. 1420 const char* last_no_suspend_cause = 1421 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1422 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1423 method_trace_ = method_trace.Get(); 1424 dex_pc_trace_ = dex_pc_trace; 1425 return true; 1426 } 1427 1428 virtual ~BuildInternalStackTraceVisitor() { 1429 if (method_trace_ != nullptr) { 1430 self_->EndAssertNoThreadSuspension(nullptr); 1431 } 1432 } 1433 1434 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1435 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1436 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1437 } 1438 if (skip_depth_ > 0) { 1439 skip_depth_--; 1440 return true; 1441 } 1442 mirror::ArtMethod* m = GetMethod(); 1443 if (m->IsRuntimeMethod()) { 1444 return true; // Ignore runtime frames (in particular callee save). 1445 } 1446 method_trace_->Set<kTransactionActive>(count_, m); 1447 dex_pc_trace_->Set<kTransactionActive>(count_, 1448 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1449 ++count_; 1450 return true; 1451 } 1452 1453 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1454 return method_trace_; 1455 } 1456 1457 private: 1458 Thread* const self_; 1459 // How many more frames to skip. 1460 int32_t skip_depth_; 1461 // Current position down stack trace. 1462 uint32_t count_; 1463 // Array of dex PC values. 1464 mirror::IntArray* dex_pc_trace_; 1465 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1466 mirror::ObjectArray<mirror::Object>* method_trace_; 1467}; 1468 1469template<bool kTransactionActive> 1470jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1471 // Compute depth of stack 1472 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1473 count_visitor.WalkStack(); 1474 int32_t depth = count_visitor.GetDepth(); 1475 int32_t skip_depth = count_visitor.GetSkipDepth(); 1476 1477 // Build internal stack trace. 1478 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1479 const_cast<Thread*>(this), 1480 skip_depth); 1481 if (!build_trace_visitor.Init(depth)) { 1482 return nullptr; // Allocation failed. 1483 } 1484 build_trace_visitor.WalkStack(); 1485 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1486 if (kIsDebugBuild) { 1487 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1488 CHECK(trace->Get(i) != nullptr); 1489 } 1490 } 1491 return soa.AddLocalReference<jobjectArray>(trace); 1492} 1493template jobject Thread::CreateInternalStackTrace<false>( 1494 const ScopedObjectAccessAlreadyRunnable& soa) const; 1495template jobject Thread::CreateInternalStackTrace<true>( 1496 const ScopedObjectAccessAlreadyRunnable& soa) const; 1497 1498jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1499 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1500 int* stack_depth) { 1501 // Decode the internal stack trace into the depth, method trace and PC trace 1502 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1503 1504 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1505 1506 jobjectArray result; 1507 1508 if (output_array != nullptr) { 1509 // Reuse the array we were given. 1510 result = output_array; 1511 // ...adjusting the number of frames we'll write to not exceed the array length. 1512 const int32_t traces_length = 1513 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1514 depth = std::min(depth, traces_length); 1515 } else { 1516 // Create java_trace array and place in local reference table 1517 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1518 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1519 if (java_traces == nullptr) { 1520 return nullptr; 1521 } 1522 result = soa.AddLocalReference<jobjectArray>(java_traces); 1523 } 1524 1525 if (stack_depth != nullptr) { 1526 *stack_depth = depth; 1527 } 1528 1529 for (int32_t i = 0; i < depth; ++i) { 1530 mirror::ObjectArray<mirror::Object>* method_trace = 1531 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1532 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1533 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1534 int32_t line_number; 1535 StackHandleScope<3> hs(soa.Self()); 1536 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1537 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1538 if (method->IsProxyMethod()) { 1539 line_number = -1; 1540 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1541 // source_name_object intentionally left null for proxy methods 1542 } else { 1543 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1544 uint32_t dex_pc = pc_trace->Get(i); 1545 line_number = method->GetLineNumFromDexPC(dex_pc); 1546 // Allocate element, potentially triggering GC 1547 // TODO: reuse class_name_object via Class::name_? 1548 const char* descriptor = method->GetDeclaringClassDescriptor(); 1549 CHECK(descriptor != nullptr); 1550 std::string class_name(PrettyDescriptor(descriptor)); 1551 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1552 if (class_name_object.Get() == nullptr) { 1553 return nullptr; 1554 } 1555 const char* source_file = method->GetDeclaringClassSourceFile(); 1556 if (source_file != nullptr) { 1557 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1558 if (source_name_object.Get() == nullptr) { 1559 return nullptr; 1560 } 1561 } 1562 } 1563 const char* method_name = method->GetName(); 1564 CHECK(method_name != nullptr); 1565 Handle<mirror::String> method_name_object( 1566 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1567 if (method_name_object.Get() == nullptr) { 1568 return nullptr; 1569 } 1570 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1571 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1572 if (obj == nullptr) { 1573 return nullptr; 1574 } 1575 // We are called from native: use non-transactional mode. 1576 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1577 } 1578 return result; 1579} 1580 1581void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1582 const char* exception_class_descriptor, const char* fmt, ...) { 1583 va_list args; 1584 va_start(args, fmt); 1585 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1586 fmt, args); 1587 va_end(args); 1588} 1589 1590void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1591 const char* exception_class_descriptor, 1592 const char* fmt, va_list ap) { 1593 std::string msg; 1594 StringAppendV(&msg, fmt, ap); 1595 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1596} 1597 1598void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1599 const char* msg) { 1600 // Callers should either clear or call ThrowNewWrappedException. 1601 AssertNoPendingExceptionForNewException(msg); 1602 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1603} 1604 1605void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1606 const char* exception_class_descriptor, 1607 const char* msg) { 1608 DCHECK_EQ(this, Thread::Current()); 1609 ScopedObjectAccessUnchecked soa(this); 1610 StackHandleScope<5> hs(soa.Self()); 1611 // Ensure we don't forget arguments over object allocation. 1612 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1613 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1614 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1615 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1616 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1617 ClearException(); 1618 Runtime* runtime = Runtime::Current(); 1619 1620 mirror::ClassLoader* cl = nullptr; 1621 if (saved_throw_method.Get() != nullptr) { 1622 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1623 } 1624 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1625 Handle<mirror::Class> exception_class( 1626 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1627 class_loader))); 1628 if (UNLIKELY(exception_class.Get() == nullptr)) { 1629 CHECK(IsExceptionPending()); 1630 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1631 return; 1632 } 1633 1634 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1635 DCHECK(IsExceptionPending()); 1636 return; 1637 } 1638 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1639 Handle<mirror::Throwable> exception( 1640 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1641 1642 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1643 if (exception.Get() == nullptr) { 1644 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1645 throw_location.GetDexPc()); 1646 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1647 SetExceptionReportedToInstrumentation(is_exception_reported); 1648 return; 1649 } 1650 1651 // Choose an appropriate constructor and set up the arguments. 1652 const char* signature; 1653 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1654 if (msg != nullptr) { 1655 // Ensure we remember this and the method over the String allocation. 1656 msg_string.reset( 1657 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1658 if (UNLIKELY(msg_string.get() == nullptr)) { 1659 CHECK(IsExceptionPending()); // OOME. 1660 return; 1661 } 1662 if (cause.get() == nullptr) { 1663 signature = "(Ljava/lang/String;)V"; 1664 } else { 1665 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1666 } 1667 } else { 1668 if (cause.get() == nullptr) { 1669 signature = "()V"; 1670 } else { 1671 signature = "(Ljava/lang/Throwable;)V"; 1672 } 1673 } 1674 mirror::ArtMethod* exception_init_method = 1675 exception_class->FindDeclaredDirectMethod("<init>", signature); 1676 1677 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1678 << PrettyDescriptor(exception_class_descriptor); 1679 1680 if (UNLIKELY(!runtime->IsStarted())) { 1681 // Something is trying to throw an exception without a started runtime, which is the common 1682 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1683 // the exception fields directly. 1684 if (msg != nullptr) { 1685 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1686 } 1687 if (cause.get() != nullptr) { 1688 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1689 } 1690 ScopedLocalRef<jobject> trace(GetJniEnv(), 1691 Runtime::Current()->IsActiveTransaction() 1692 ? CreateInternalStackTrace<true>(soa) 1693 : CreateInternalStackTrace<false>(soa)); 1694 if (trace.get() != nullptr) { 1695 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1696 } 1697 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1698 throw_location.GetDexPc()); 1699 SetException(gc_safe_throw_location, exception.Get()); 1700 SetExceptionReportedToInstrumentation(is_exception_reported); 1701 } else { 1702 jvalue jv_args[2]; 1703 size_t i = 0; 1704 1705 if (msg != nullptr) { 1706 jv_args[i].l = msg_string.get(); 1707 ++i; 1708 } 1709 if (cause.get() != nullptr) { 1710 jv_args[i].l = cause.get(); 1711 ++i; 1712 } 1713 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1714 if (LIKELY(!IsExceptionPending())) { 1715 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1716 throw_location.GetDexPc()); 1717 SetException(gc_safe_throw_location, exception.Get()); 1718 SetExceptionReportedToInstrumentation(is_exception_reported); 1719 } 1720 } 1721} 1722 1723void Thread::ThrowOutOfMemoryError(const char* msg) { 1724 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1725 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1726 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1727 if (!tls32_.throwing_OutOfMemoryError) { 1728 tls32_.throwing_OutOfMemoryError = true; 1729 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1730 tls32_.throwing_OutOfMemoryError = false; 1731 } else { 1732 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1733 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1734 } 1735} 1736 1737Thread* Thread::CurrentFromGdb() { 1738 return Thread::Current(); 1739} 1740 1741void Thread::DumpFromGdb() const { 1742 std::ostringstream ss; 1743 Dump(ss); 1744 std::string str(ss.str()); 1745 // log to stderr for debugging command line processes 1746 std::cerr << str; 1747#ifdef HAVE_ANDROID_OS 1748 // log to logcat for debugging frameworks processes 1749 LOG(INFO) << str; 1750#endif 1751} 1752 1753// Explicitly instantiate 32 and 64bit thread offset dumping support. 1754template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1755template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1756 1757template<size_t ptr_size> 1758void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1759#define DO_THREAD_OFFSET(x, y) \ 1760 if (offset == x.Uint32Value()) { \ 1761 os << y; \ 1762 return; \ 1763 } 1764 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1765 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1766 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1767 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1768 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1769 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1770 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1771 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1772 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1773 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1774 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1775 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1776 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1777#undef DO_THREAD_OFFSET 1778 1779#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1780 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1781 os << #x; \ 1782 return; \ 1783 } 1784 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1785 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1786#undef INTERPRETER_ENTRY_POINT_INFO 1787 1788#define JNI_ENTRY_POINT_INFO(x) \ 1789 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1790 os << #x; \ 1791 return; \ 1792 } 1793 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1794#undef JNI_ENTRY_POINT_INFO 1795 1796#define PORTABLE_ENTRY_POINT_INFO(x) \ 1797 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1798 os << #x; \ 1799 return; \ 1800 } 1801 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1802 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1803 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1804#undef PORTABLE_ENTRY_POINT_INFO 1805 1806#define QUICK_ENTRY_POINT_INFO(x) \ 1807 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1808 os << #x; \ 1809 return; \ 1810 } 1811 QUICK_ENTRY_POINT_INFO(pAllocArray) 1812 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1813 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1814 QUICK_ENTRY_POINT_INFO(pAllocObject) 1815 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1816 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1817 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1818 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1819 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1820 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1821 QUICK_ENTRY_POINT_INFO(pCheckCast) 1822 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1823 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1824 QUICK_ENTRY_POINT_INFO(pInitializeType) 1825 QUICK_ENTRY_POINT_INFO(pResolveString) 1826 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1827 QUICK_ENTRY_POINT_INFO(pSet32Static) 1828 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1829 QUICK_ENTRY_POINT_INFO(pSet64Static) 1830 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1831 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1832 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1833 QUICK_ENTRY_POINT_INFO(pGet32Static) 1834 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1835 QUICK_ENTRY_POINT_INFO(pGet64Static) 1836 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1837 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1838 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1839 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1840 QUICK_ENTRY_POINT_INFO(pAputObject) 1841 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1842 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1843 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1844 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1845 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1846 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1847 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1848 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1849 QUICK_ENTRY_POINT_INFO(pLockObject) 1850 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1851 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1852 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1853 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1854 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1855 QUICK_ENTRY_POINT_INFO(pFmod) 1856 QUICK_ENTRY_POINT_INFO(pL2d) 1857 QUICK_ENTRY_POINT_INFO(pFmodf) 1858 QUICK_ENTRY_POINT_INFO(pL2f) 1859 QUICK_ENTRY_POINT_INFO(pD2iz) 1860 QUICK_ENTRY_POINT_INFO(pF2iz) 1861 QUICK_ENTRY_POINT_INFO(pIdivmod) 1862 QUICK_ENTRY_POINT_INFO(pD2l) 1863 QUICK_ENTRY_POINT_INFO(pF2l) 1864 QUICK_ENTRY_POINT_INFO(pLdiv) 1865 QUICK_ENTRY_POINT_INFO(pLmod) 1866 QUICK_ENTRY_POINT_INFO(pLmul) 1867 QUICK_ENTRY_POINT_INFO(pShlLong) 1868 QUICK_ENTRY_POINT_INFO(pShrLong) 1869 QUICK_ENTRY_POINT_INFO(pUshrLong) 1870 QUICK_ENTRY_POINT_INFO(pIndexOf) 1871 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1872 QUICK_ENTRY_POINT_INFO(pMemcpy) 1873 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1874 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1875 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1876 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1877 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1878 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1879 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1880 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1881 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1882 QUICK_ENTRY_POINT_INFO(pDeliverException) 1883 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1884 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1885 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1886 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1887 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1888#undef QUICK_ENTRY_POINT_INFO 1889 1890 os << offset; 1891} 1892 1893void Thread::QuickDeliverException() { 1894 // Get exception from thread. 1895 ThrowLocation throw_location; 1896 mirror::Throwable* exception = GetException(&throw_location); 1897 CHECK(exception != nullptr); 1898 // Don't leave exception visible while we try to find the handler, which may cause class 1899 // resolution. 1900 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1901 ClearException(); 1902 bool is_deoptimization = (exception == GetDeoptimizationException()); 1903 QuickExceptionHandler exception_handler(this, is_deoptimization); 1904 if (is_deoptimization) { 1905 exception_handler.DeoptimizeStack(); 1906 } else { 1907 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1908 } 1909 exception_handler.UpdateInstrumentationStack(); 1910 exception_handler.DoLongJump(); 1911 LOG(FATAL) << "UNREACHABLE"; 1912} 1913 1914Context* Thread::GetLongJumpContext() { 1915 Context* result = tlsPtr_.long_jump_context; 1916 if (result == nullptr) { 1917 result = Context::Create(); 1918 } else { 1919 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1920 result->Reset(); 1921 } 1922 return result; 1923} 1924 1925struct CurrentMethodVisitor FINAL : public StackVisitor { 1926 CurrentMethodVisitor(Thread* thread, Context* context) 1927 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1928 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1929 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1930 mirror::ArtMethod* m = GetMethod(); 1931 if (m->IsRuntimeMethod()) { 1932 // Continue if this is a runtime method. 1933 return true; 1934 } 1935 if (context_ != nullptr) { 1936 this_object_ = GetThisObject(); 1937 } 1938 method_ = m; 1939 dex_pc_ = GetDexPc(); 1940 return false; 1941 } 1942 mirror::Object* this_object_; 1943 mirror::ArtMethod* method_; 1944 uint32_t dex_pc_; 1945}; 1946 1947mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1948 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1949 visitor.WalkStack(false); 1950 if (dex_pc != nullptr) { 1951 *dex_pc = visitor.dex_pc_; 1952 } 1953 return visitor.method_; 1954} 1955 1956ThrowLocation Thread::GetCurrentLocationForThrow() { 1957 Context* context = GetLongJumpContext(); 1958 CurrentMethodVisitor visitor(this, context); 1959 visitor.WalkStack(false); 1960 ReleaseLongJumpContext(context); 1961 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1962} 1963 1964bool Thread::HoldsLock(mirror::Object* object) const { 1965 if (object == nullptr) { 1966 return false; 1967 } 1968 return object->GetLockOwnerThreadId() == GetThreadId(); 1969} 1970 1971// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1972template <typename RootVisitor> 1973class ReferenceMapVisitor : public StackVisitor { 1974 public: 1975 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1976 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1977 : StackVisitor(thread, context), visitor_(visitor) {} 1978 1979 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1980 if (false) { 1981 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1982 << StringPrintf("@ PC:%04x", GetDexPc()); 1983 } 1984 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1985 if (shadow_frame != nullptr) { 1986 VisitShadowFrame(shadow_frame); 1987 } else { 1988 VisitQuickFrame(); 1989 } 1990 return true; 1991 } 1992 1993 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1994 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 1995 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 1996 mirror::ArtMethod* m = *method_addr; 1997 DCHECK(m != nullptr); 1998 size_t num_regs = shadow_frame->NumberOfVRegs(); 1999 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2000 // handle scope for JNI or References for interpreter. 2001 for (size_t reg = 0; reg < num_regs; ++reg) { 2002 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2003 if (ref != nullptr) { 2004 mirror::Object* new_ref = ref; 2005 visitor_(&new_ref, reg, this); 2006 if (new_ref != ref) { 2007 shadow_frame->SetVRegReference(reg, new_ref); 2008 } 2009 } 2010 } 2011 } else { 2012 // Java method. 2013 // Portable path use DexGcMap and store in Method.native_gc_map_. 2014 const uint8_t* gc_map = m->GetNativeGcMap(); 2015 CHECK(gc_map != nullptr) << PrettyMethod(m); 2016 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2017 uint32_t dex_pc = shadow_frame->GetDexPC(); 2018 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2019 DCHECK(reg_bitmap != nullptr); 2020 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2021 for (size_t reg = 0; reg < num_regs; ++reg) { 2022 if (TestBitmap(reg, reg_bitmap)) { 2023 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2024 if (ref != nullptr) { 2025 mirror::Object* new_ref = ref; 2026 visitor_(&new_ref, reg, this); 2027 if (new_ref != ref) { 2028 shadow_frame->SetVRegReference(reg, new_ref); 2029 } 2030 } 2031 } 2032 } 2033 } 2034 } 2035 2036 private: 2037 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2038 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2039 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2040 mirror::ArtMethod* old_method = m; 2041 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2042 if (m != old_method) { 2043 cur_quick_frame->Assign(m); 2044 } 2045 2046 // Process register map (which native and runtime methods don't have) 2047 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2048 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2049 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2050 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2051 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2052 NativePcOffsetToReferenceMap map(native_gc_map); 2053 size_t num_regs = std::min(map.RegWidth() * 8, 2054 static_cast<size_t>(code_item->registers_size_)); 2055 if (num_regs > 0) { 2056 Runtime* runtime = Runtime::Current(); 2057 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2058 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2059 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2060 DCHECK(reg_bitmap != nullptr); 2061 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2062 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2063 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2064 // For all dex registers in the bitmap 2065 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2066 DCHECK(cur_quick_frame != nullptr); 2067 for (size_t reg = 0; reg < num_regs; ++reg) { 2068 // Does this register hold a reference? 2069 if (TestBitmap(reg, reg_bitmap)) { 2070 uint32_t vmap_offset; 2071 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2072 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2073 kReferenceVReg); 2074 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2075 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2076 if (*ref_addr != nullptr) { 2077 visitor_(ref_addr, reg, this); 2078 } 2079 } else { 2080 StackReference<mirror::Object>* ref_addr = 2081 reinterpret_cast<StackReference<mirror::Object>*>( 2082 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2083 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2084 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2085 if (ref != nullptr) { 2086 mirror::Object* new_ref = ref; 2087 visitor_(&new_ref, reg, this); 2088 if (ref != new_ref) { 2089 ref_addr->Assign(new_ref); 2090 } 2091 } 2092 } 2093 } 2094 } 2095 } 2096 } 2097 } 2098 2099 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2100 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2101 } 2102 2103 // Visitor for when we visit a root. 2104 const RootVisitor& visitor_; 2105}; 2106 2107class RootCallbackVisitor { 2108 public: 2109 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2110 : callback_(callback), arg_(arg), tid_(tid) {} 2111 2112 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2113 callback_(obj, arg_, tid_, kRootJavaFrame); 2114 } 2115 2116 private: 2117 RootCallback* const callback_; 2118 void* const arg_; 2119 const uint32_t tid_; 2120}; 2121 2122void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2123 VerifyObject(class_loader_override); 2124 tlsPtr_.class_loader_override = class_loader_override; 2125} 2126 2127void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2128 uint32_t thread_id = GetThreadId(); 2129 if (tlsPtr_.opeer != nullptr) { 2130 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2131 } 2132 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2133 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2134 } 2135 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2136 if (tlsPtr_.class_loader_override != nullptr) { 2137 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, thread_id, 2138 kRootNativeStack); 2139 } 2140 if (tlsPtr_.monitor_enter_object != nullptr) { 2141 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2142 } 2143 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2144 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2145 HandleScopeVisitRoots(visitor, arg, thread_id); 2146 if (tlsPtr_.debug_invoke_req != nullptr) { 2147 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2148 } 2149 if (tlsPtr_.single_step_control != nullptr) { 2150 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2151 } 2152 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2153 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2154 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2155 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2156 shadow_frame = shadow_frame->GetLink()) { 2157 mapper.VisitShadowFrame(shadow_frame); 2158 } 2159 } 2160 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2161 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2162 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2163 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2164 shadow_frame != nullptr; 2165 shadow_frame = shadow_frame->GetLink()) { 2166 mapper.VisitShadowFrame(shadow_frame); 2167 } 2168 } 2169 // Visit roots on this thread's stack 2170 Context* context = GetLongJumpContext(); 2171 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2172 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2173 mapper.WalkStack(); 2174 ReleaseLongJumpContext(context); 2175 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2176 if (frame.this_object_ != nullptr) { 2177 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2178 } 2179 DCHECK(frame.method_ != nullptr); 2180 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2181 } 2182} 2183 2184static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2185 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2186 VerifyObject(*root); 2187} 2188 2189void Thread::VerifyStackImpl() { 2190 std::unique_ptr<Context> context(Context::Create()); 2191 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2192 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2193 mapper.WalkStack(); 2194} 2195 2196// Set the stack end to that to be used during a stack overflow 2197void Thread::SetStackEndForStackOverflow() { 2198 // During stack overflow we allow use of the full stack. 2199 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2200 // However, we seem to have already extended to use the full stack. 2201 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2202 << kRuntimeStackOverflowReservedBytes << ")?"; 2203 DumpStack(LOG(ERROR)); 2204 LOG(FATAL) << "Recursive stack overflow."; 2205 } 2206 2207 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2208} 2209 2210void Thread::SetTlab(byte* start, byte* end) { 2211 DCHECK_LE(start, end); 2212 tlsPtr_.thread_local_start = start; 2213 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2214 tlsPtr_.thread_local_end = end; 2215 tlsPtr_.thread_local_objects = 0; 2216} 2217 2218bool Thread::HasTlab() const { 2219 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2220 if (has_tlab) { 2221 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2222 } else { 2223 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2224 } 2225 return has_tlab; 2226} 2227 2228std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2229 thread.ShortDump(os); 2230 return os; 2231} 2232 2233} // namespace art 2234