thread.cc revision b0fa5dc7769c1e054032f39de0a3f6d6dd06f8cf
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define ATRACE_TAG ATRACE_TAG_DALVIK 18 19#include "thread.h" 20 21#include <cutils/trace.h> 22#include <pthread.h> 23#include <signal.h> 24#include <sys/resource.h> 25#include <sys/time.h> 26 27#include <algorithm> 28#include <bitset> 29#include <cerrno> 30#include <iostream> 31#include <list> 32 33#include "arch/context.h" 34#include "base/mutex.h" 35#include "class_linker.h" 36#include "class_linker-inl.h" 37#include "cutils/atomic.h" 38#include "cutils/atomic-inline.h" 39#include "debugger.h" 40#include "dex_file-inl.h" 41#include "entrypoints/entrypoint_utils.h" 42#include "entrypoints/quick/quick_alloc_entrypoints.h" 43#include "gc_map.h" 44#include "gc/accounting/card_table-inl.h" 45#include "gc/heap.h" 46#include "gc/space/space.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 "reflection.h" 58#include "runtime.h" 59#include "scoped_thread_state_change.h" 60#include "ScopedLocalRef.h" 61#include "ScopedUtfChars.h" 62#include "sirt_ref.h" 63#include "stack.h" 64#include "stack_indirect_reference_table.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::InitTid() { 124 tls32_.tid = ::art::GetTid(); 125} 126 127void Thread::InitAfterFork() { 128 // One thread (us) survived the fork, but we have a new tid so we need to 129 // update the value stashed in this Thread*. 130 InitTid(); 131} 132 133void* Thread::CreateCallback(void* arg) { 134 Thread* self = reinterpret_cast<Thread*>(arg); 135 Runtime* runtime = Runtime::Current(); 136 if (runtime == nullptr) { 137 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 138 return nullptr; 139 } 140 { 141 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 142 // after self->Init(). 143 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 144 // Check that if we got here we cannot be shutting down (as shutdown should never have started 145 // while threads are being born). 146 CHECK(!runtime->IsShuttingDownLocked()); 147 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 148 Runtime::Current()->EndThreadBirth(); 149 } 150 { 151 ScopedObjectAccess soa(self); 152 153 // Copy peer into self, deleting global reference when done. 154 CHECK(self->tlsPtr_.jpeer != nullptr); 155 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 156 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 157 self->tlsPtr_.jpeer = nullptr; 158 159 { 160 SirtRef<mirror::String> thread_name(self, self->GetThreadName(soa)); 161 self->SetThreadName(thread_name->ToModifiedUtf8().c_str()); 162 } 163 Dbg::PostThreadStart(self); 164 165 // Invoke the 'run' method of our java.lang.Thread. 166 mirror::Object* receiver = self->tlsPtr_.opeer; 167 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 168 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 169 } 170 // Detach and delete self. 171 Runtime::Current()->GetThreadList()->Unregister(self); 172 173 return nullptr; 174} 175 176Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, 177 mirror::Object* thread_peer) { 178 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 179 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 180 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 181 // to stop it from going away. 182 if (kIsDebugBuild) { 183 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 184 if (result != nullptr && !result->IsSuspended()) { 185 Locks::thread_list_lock_->AssertHeld(soa.Self()); 186 } 187 } 188 return result; 189} 190 191Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, jobject java_thread) { 192 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 193} 194 195static size_t FixStackSize(size_t stack_size) { 196 // A stack size of zero means "use the default". 197 if (stack_size == 0) { 198 stack_size = Runtime::Current()->GetDefaultStackSize(); 199 } 200 201 // Dalvik used the bionic pthread default stack size for native threads, 202 // so include that here to support apps that expect large native stacks. 203 stack_size += 1 * MB; 204 205 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 206 if (stack_size < PTHREAD_STACK_MIN) { 207 stack_size = PTHREAD_STACK_MIN; 208 } 209 210 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 211 // It's likely that callers are trying to ensure they have at least a certain amount of 212 // stack space, so we should add our reserved space on top of what they requested, rather 213 // than implicitly take it away from them. 214 stack_size += Thread::kStackOverflowReservedBytes; 215 } else { 216 // If we are going to use implicit stack checks, allocate space for the protected 217 // region at the bottom of the stack. 218 stack_size += Thread::kStackOverflowImplicitCheckSize; 219 } 220 221 // Some systems require the stack size to be a multiple of the system page size, so round up. 222 stack_size = RoundUp(stack_size, kPageSize); 223 224 return stack_size; 225} 226 227// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 228// overflow is detected. It is located right below the stack_end_. Just below that 229// is the StackOverflow reserved region used when creating the StackOverflow 230// exception. 231void Thread::InstallImplicitProtection(bool is_main_stack) { 232 byte* pregion = tlsPtr_.stack_end; 233 234 constexpr uint32_t kMarker = 0xdadadada; 235 uintptr_t *marker = reinterpret_cast<uintptr_t*>(pregion); 236 if (*marker == kMarker) { 237 // The region has already been set up. 238 return; 239 } 240 // Add marker so that we can detect a second attempt to do this. 241 *marker = kMarker; 242 243 pregion -= kStackOverflowProtectedSize; 244 245 // Touch the pages in the region to map them in. Otherwise mprotect fails. Only 246 // need to do this on the main stack. 247 if (is_main_stack) { 248 memset(pregion, 0x55, kStackOverflowProtectedSize); 249 } 250 VLOG(threads) << "installing stack protected region at " << std::hex << 251 static_cast<void*>(pregion) << " to " << 252 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 253 254 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 255 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. Reason:" 256 << strerror(errno); 257 } 258} 259 260void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 261 CHECK(java_peer != nullptr); 262 Thread* self = static_cast<JNIEnvExt*>(env)->self; 263 Runtime* runtime = Runtime::Current(); 264 265 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 266 bool thread_start_during_shutdown = false; 267 { 268 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 269 if (runtime->IsShuttingDownLocked()) { 270 thread_start_during_shutdown = true; 271 } else { 272 runtime->StartThreadBirth(); 273 } 274 } 275 if (thread_start_during_shutdown) { 276 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 277 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 278 return; 279 } 280 281 Thread* child_thread = new Thread(is_daemon); 282 // Use global JNI ref to hold peer live while child thread starts. 283 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 284 stack_size = FixStackSize(stack_size); 285 286 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 287 // assign it. 288 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 289 reinterpret_cast<jlong>(child_thread)); 290 291 pthread_t new_pthread; 292 pthread_attr_t attr; 293 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 294 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 295 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 296 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 297 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 298 299 if (pthread_create_result != 0) { 300 // pthread_create(3) failed, so clean up. 301 { 302 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 303 runtime->EndThreadBirth(); 304 } 305 // Manually delete the global reference since Thread::Init will not have been run. 306 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 307 child_thread->tlsPtr_.jpeer = nullptr; 308 delete child_thread; 309 child_thread = nullptr; 310 // TODO: remove from thread group? 311 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 312 { 313 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 314 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 315 ScopedObjectAccess soa(env); 316 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 317 } 318 } 319} 320 321void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 322 // This function does all the initialization that must be run by the native thread it applies to. 323 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 324 // we can handshake with the corresponding native thread when it's ready.) Check this native 325 // thread hasn't been through here already... 326 CHECK(Thread::Current() == nullptr); 327 SetUpAlternateSignalStack(); 328 InitCpu(); 329 InitTlsEntryPoints(); 330 RemoveSuspendTrigger(); 331 InitCardTable(); 332 InitTid(); 333 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 334 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 335 tlsPtr_.pthread_self = pthread_self(); 336 CHECK(is_started_); 337 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 338 DCHECK_EQ(Thread::Current(), this); 339 340 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 341 InitStackHwm(); 342 343 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 344 thread_list->Register(this); 345} 346 347Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 348 bool create_peer) { 349 Thread* self; 350 Runtime* runtime = Runtime::Current(); 351 if (runtime == nullptr) { 352 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 353 return nullptr; 354 } 355 { 356 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 357 if (runtime->IsShuttingDownLocked()) { 358 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 359 return nullptr; 360 } else { 361 Runtime::Current()->StartThreadBirth(); 362 self = new Thread(as_daemon); 363 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 364 Runtime::Current()->EndThreadBirth(); 365 } 366 } 367 368 CHECK_NE(self->GetState(), kRunnable); 369 self->SetState(kNative); 370 371 // If we're the main thread, ClassLinker won't be created until after we're attached, 372 // so that thread needs a two-stage attach. Regular threads don't need this hack. 373 // In the compiler, all threads need this hack, because no-one's going to be getting 374 // a native peer! 375 if (create_peer) { 376 self->CreatePeer(thread_name, as_daemon, thread_group); 377 } else { 378 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 379 if (thread_name != nullptr) { 380 self->tlsPtr_.name->assign(thread_name); 381 ::art::SetThreadName(thread_name); 382 } 383 } 384 385 return self; 386} 387 388void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 389 Runtime* runtime = Runtime::Current(); 390 CHECK(runtime->IsStarted()); 391 JNIEnv* env = tlsPtr_.jni_env; 392 393 if (thread_group == nullptr) { 394 thread_group = runtime->GetMainThreadGroup(); 395 } 396 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 397 jint thread_priority = GetNativePriority(); 398 jboolean thread_is_daemon = as_daemon; 399 400 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 401 if (peer.get() == nullptr) { 402 CHECK(IsExceptionPending()); 403 return; 404 } 405 { 406 ScopedObjectAccess soa(this); 407 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 408 } 409 env->CallNonvirtualVoidMethod(peer.get(), 410 WellKnownClasses::java_lang_Thread, 411 WellKnownClasses::java_lang_Thread_init, 412 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 413 AssertNoPendingException(); 414 415 Thread* self = this; 416 DCHECK_EQ(self, Thread::Current()); 417 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 418 reinterpret_cast<jlong>(self)); 419 420 ScopedObjectAccess soa(self); 421 SirtRef<mirror::String> peer_thread_name(soa.Self(), GetThreadName(soa)); 422 if (peer_thread_name.get() == nullptr) { 423 // The Thread constructor should have set the Thread.name to a 424 // non-null value. However, because we can run without code 425 // available (in the compiler, in tests), we manually assign the 426 // fields the constructor should have set. 427 if (runtime->IsActiveTransaction()) { 428 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 429 } else { 430 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 431 } 432 peer_thread_name.reset(GetThreadName(soa)); 433 } 434 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 435 if (peer_thread_name.get() != nullptr) { 436 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 437 } 438} 439 440template<bool kTransactionActive> 441void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 442 jobject thread_name, jint thread_priority) { 443 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 444 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 445 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 446 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 447 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 448 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 449 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 450 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 451} 452 453void Thread::SetThreadName(const char* name) { 454 tlsPtr_.name->assign(name); 455 ::art::SetThreadName(name); 456 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 457} 458 459void Thread::InitStackHwm() { 460 void* read_stack_base; 461 size_t read_stack_size; 462 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 463 464 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 465 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 466 PrettySize(read_stack_size).c_str()); 467 468 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 469 tlsPtr_.stack_size = read_stack_size; 470 471 if (read_stack_size <= kStackOverflowReservedBytes) { 472 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 473 << " bytes)"; 474 } 475 476 // TODO: move this into the Linux GetThreadStack implementation. 477#if !defined(__APPLE__) 478 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 479 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 480 // will be broken because we'll die long before we get close to 2GB. 481 bool is_main_thread = (::art::GetTid() == getpid()); 482 if (is_main_thread) { 483 rlimit stack_limit; 484 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 485 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 486 } 487 if (stack_limit.rlim_cur == RLIM_INFINITY) { 488 // Find the default stack size for new threads... 489 pthread_attr_t default_attributes; 490 size_t default_stack_size; 491 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 492 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 493 "default stack size query"); 494 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 495 496 // ...and use that as our limit. 497 size_t old_stack_size = read_stack_size; 498 tlsPtr_.stack_size = default_stack_size; 499 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 500 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 501 << " to " << PrettySize(default_stack_size) 502 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 503 } 504 } 505#endif 506 507 // Set stack_end_ to the bottom of the stack saving space of stack overflows 508 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 509 ResetDefaultStackEnd(implicit_stack_check); 510 511 // Install the protected region if we are doing implicit overflow checks. 512 if (implicit_stack_check) { 513 if (is_main_thread) { 514 // The main thread has a 16K protected region at the bottom. We need 515 // to install our own region so we need to move the limits 516 // of the stack to make room for it. 517 constexpr uint32_t kDelta = 16 * KB; 518 tlsPtr_.stack_begin += kDelta; 519 tlsPtr_.stack_end += kDelta; 520 tlsPtr_.stack_size -= kDelta; 521 } 522 InstallImplicitProtection(is_main_thread); 523 } 524 525 // Sanity check. 526 int stack_variable; 527 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 528} 529 530void Thread::ShortDump(std::ostream& os) const { 531 os << "Thread["; 532 if (GetThreadId() != 0) { 533 // If we're in kStarting, we won't have a thin lock id or tid yet. 534 os << GetThreadId() 535 << ",tid=" << GetTid() << ','; 536 } 537 os << GetState() 538 << ",Thread*=" << this 539 << ",peer=" << tlsPtr_.opeer 540 << ",\"" << *tlsPtr_.name << "\"" 541 << "]"; 542} 543 544void Thread::Dump(std::ostream& os) const { 545 DumpState(os); 546 DumpStack(os); 547} 548 549mirror::String* Thread::GetThreadName(const ScopedObjectAccessUnchecked& soa) const { 550 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 551 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 552} 553 554void Thread::GetThreadName(std::string& name) const { 555 name.assign(*tlsPtr_.name); 556} 557 558uint64_t Thread::GetCpuMicroTime() const { 559#if defined(HAVE_POSIX_CLOCKS) 560 clockid_t cpu_clock_id; 561 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 562 timespec now; 563 clock_gettime(cpu_clock_id, &now); 564 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 565#else 566 UNIMPLEMENTED(WARNING); 567 return -1; 568#endif 569} 570 571void Thread::AtomicSetFlag(ThreadFlag flag) { 572 android_atomic_or(flag, &tls32_.state_and_flags.as_int); 573} 574 575void Thread::AtomicClearFlag(ThreadFlag flag) { 576 android_atomic_and(-1 ^ flag, &tls32_.state_and_flags.as_int); 577} 578 579// Attempt to rectify locks so that we dump thread list with required locks before exiting. 580static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 581 LOG(ERROR) << *thread << " suspend count already zero."; 582 Locks::thread_suspend_count_lock_->Unlock(self); 583 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 584 Locks::mutator_lock_->SharedTryLock(self); 585 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 586 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 587 } 588 } 589 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 590 Locks::thread_list_lock_->TryLock(self); 591 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 592 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 593 } 594 } 595 std::ostringstream ss; 596 Runtime::Current()->GetThreadList()->DumpLocked(ss); 597 LOG(FATAL) << ss.str(); 598} 599 600void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 601 if (kIsDebugBuild) { 602 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 603 << delta << " " << tls32_.debug_suspend_count << " " << this; 604 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 605 Locks::thread_suspend_count_lock_->AssertHeld(self); 606 if (this != self && !IsSuspended()) { 607 Locks::thread_list_lock_->AssertHeld(self); 608 } 609 } 610 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 611 UnsafeLogFatalForSuspendCount(self, this); 612 return; 613 } 614 615 tls32_.suspend_count += delta; 616 if (for_debugger) { 617 tls32_.debug_suspend_count += delta; 618 } 619 620 if (tls32_.suspend_count == 0) { 621 AtomicClearFlag(kSuspendRequest); 622 } else { 623 AtomicSetFlag(kSuspendRequest); 624 TriggerSuspend(); 625 } 626} 627 628void Thread::RunCheckpointFunction() { 629 Closure *checkpoints[kMaxCheckpoints]; 630 631 // Grab the suspend_count lock and copy the current set of 632 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 633 // function will also grab this lock so we prevent a race between setting 634 // the kCheckpointRequest flag and clearing it. 635 { 636 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 637 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 638 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 639 tlsPtr_.checkpoint_functions[i] = nullptr; 640 } 641 AtomicClearFlag(kCheckpointRequest); 642 } 643 644 // Outside the lock, run all the checkpoint functions that 645 // we collected. 646 bool found_checkpoint = false; 647 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 648 if (checkpoints[i] != nullptr) { 649 ATRACE_BEGIN("Checkpoint function"); 650 checkpoints[i]->Run(this); 651 ATRACE_END(); 652 found_checkpoint = true; 653 } 654 } 655 CHECK(found_checkpoint); 656} 657 658bool Thread::RequestCheckpoint(Closure* function) { 659 union StateAndFlags old_state_and_flags; 660 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 661 if (old_state_and_flags.as_struct.state != kRunnable) { 662 return false; // Fail, thread is suspended and so can't run a checkpoint. 663 } 664 665 uint32_t available_checkpoint = kMaxCheckpoints; 666 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 667 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 668 available_checkpoint = i; 669 break; 670 } 671 } 672 if (available_checkpoint == kMaxCheckpoints) { 673 // No checkpoint functions available, we can't run a checkpoint 674 return false; 675 } 676 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 677 678 // Checkpoint function installed now install flag bit. 679 // We must be runnable to request a checkpoint. 680 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 681 union StateAndFlags new_state_and_flags; 682 new_state_and_flags.as_int = old_state_and_flags.as_int; 683 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 684 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 685 &tls32_.state_and_flags.as_int); 686 if (UNLIKELY(succeeded != 0)) { 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 succeeded == 0; 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 } 807} 808 809void Thread::DumpState(std::ostream& os) const { 810 Thread::DumpState(os, this, GetTid()); 811} 812 813struct StackDumpVisitor : public StackVisitor { 814 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 815 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 816 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 817 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 818 } 819 820 virtual ~StackDumpVisitor() { 821 if (frame_count == 0) { 822 os << " (no managed stack frames)\n"; 823 } 824 } 825 826 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 827 mirror::ArtMethod* m = GetMethod(); 828 if (m->IsRuntimeMethod()) { 829 return true; 830 } 831 const int kMaxRepetition = 3; 832 mirror::Class* c = m->GetDeclaringClass(); 833 mirror::DexCache* dex_cache = c->GetDexCache(); 834 int line_number = -1; 835 if (dex_cache != nullptr) { // be tolerant of bad input 836 const DexFile& dex_file = *dex_cache->GetDexFile(); 837 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 838 } 839 if (line_number == last_line_number && last_method == m) { 840 ++repetition_count; 841 } else { 842 if (repetition_count >= kMaxRepetition) { 843 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 844 } 845 repetition_count = 0; 846 last_line_number = line_number; 847 last_method = m; 848 } 849 if (repetition_count < kMaxRepetition) { 850 os << " at " << PrettyMethod(m, false); 851 if (m->IsNative()) { 852 os << "(Native method)"; 853 } else { 854 mh.ChangeMethod(m); 855 const char* source_file(mh.GetDeclaringClassSourceFile()); 856 os << "(" << (source_file != nullptr ? source_file : "unavailable") 857 << ":" << line_number << ")"; 858 } 859 os << "\n"; 860 if (frame_count == 0) { 861 Monitor::DescribeWait(os, thread); 862 } 863 if (can_allocate) { 864 Monitor::VisitLocks(this, DumpLockedObject, &os); 865 } 866 } 867 868 ++frame_count; 869 return true; 870 } 871 872 static void DumpLockedObject(mirror::Object* o, void* context) 873 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 874 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 875 os << " - locked "; 876 if (o == nullptr) { 877 os << "an unknown object"; 878 } else { 879 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 880 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 881 // Getting the identity hashcode here would result in lock inflation and suspension of the 882 // current thread, which isn't safe if this is the only runnable thread. 883 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 884 PrettyTypeOf(o).c_str()); 885 } else { 886 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 887 } 888 } 889 os << "\n"; 890 } 891 892 std::ostream& os; 893 const Thread* thread; 894 const bool can_allocate; 895 MethodHelper mh; 896 mirror::ArtMethod* last_method; 897 int last_line_number; 898 int repetition_count; 899 int frame_count; 900}; 901 902static bool ShouldShowNativeStack(const Thread* thread) 903 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 904 ThreadState state = thread->GetState(); 905 906 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 907 if (state > kWaiting && state < kStarting) { 908 return true; 909 } 910 911 // In an Object.wait variant or Thread.sleep? That's not interesting. 912 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 913 return false; 914 } 915 916 // In some other native method? That's interesting. 917 // We don't just check kNative because native methods will be in state kSuspended if they're 918 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 919 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 920 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 921 return current_method != nullptr && current_method->IsNative(); 922} 923 924void Thread::DumpJavaStack(std::ostream& os) const { 925 UniquePtr<Context> context(Context::Create()); 926 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 927 !tls32_.throwing_OutOfMemoryError); 928 dumper.WalkStack(); 929} 930 931void Thread::DumpStack(std::ostream& os) const { 932 // TODO: we call this code when dying but may not have suspended the thread ourself. The 933 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 934 // the race with the thread_suspend_count_lock_). 935 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 936 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 937 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 938 // If we're currently in native code, dump that stack before dumping the managed stack. 939 if (dump_for_abort || ShouldShowNativeStack(this)) { 940 DumpKernelStack(os, GetTid(), " kernel: ", false); 941 SirtRef<mirror::ArtMethod> method_ref(Thread::Current(), GetCurrentMethod(nullptr)); 942 DumpNativeStack(os, GetTid(), " native: ", method_ref.get()); 943 } 944 DumpJavaStack(os); 945 } else { 946 os << "Not able to dump stack of thread that isn't suspended"; 947 } 948} 949 950void Thread::ThreadExitCallback(void* arg) { 951 Thread* self = reinterpret_cast<Thread*>(arg); 952 if (self->tls32_.thread_exit_check_count == 0) { 953 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 954 "going to use a pthread_key_create destructor?): " << *self; 955 CHECK(is_started_); 956 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 957 self->tls32_.thread_exit_check_count = 1; 958 } else { 959 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 960 } 961} 962 963void Thread::Startup() { 964 CHECK(!is_started_); 965 is_started_ = true; 966 { 967 // MutexLock to keep annotalysis happy. 968 // 969 // Note we use nullptr for the thread because Thread::Current can 970 // return garbage since (is_started_ == true) and 971 // Thread::pthread_key_self_ is not yet initialized. 972 // This was seen on glibc. 973 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 974 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 975 *Locks::thread_suspend_count_lock_); 976 } 977 978 // Allocate a TLS slot. 979 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 980 981 // Double-check the TLS slot allocation. 982 if (pthread_getspecific(pthread_key_self_) != nullptr) { 983 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 984 } 985} 986 987void Thread::FinishStartup() { 988 Runtime* runtime = Runtime::Current(); 989 CHECK(runtime->IsStarted()); 990 991 // Finish attaching the main thread. 992 ScopedObjectAccess soa(Thread::Current()); 993 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 994 995 Runtime::Current()->GetClassLinker()->RunRootClinits(); 996} 997 998void Thread::Shutdown() { 999 CHECK(is_started_); 1000 is_started_ = false; 1001 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1002 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1003 if (resume_cond_ != nullptr) { 1004 delete resume_cond_; 1005 resume_cond_ = nullptr; 1006 } 1007} 1008 1009Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1010 wait_mutex_ = new Mutex("a thread wait mutex"); 1011 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1012 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1013 tlsPtr_.single_step_control = new SingleStepControl; 1014 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1015 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1016 1017 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1018 tls32_.state_and_flags.as_struct.flags = 0; 1019 tls32_.state_and_flags.as_struct.state = kNative; 1020 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1021 std::fill(tlsPtr_.rosalloc_runs, tlsPtr_.rosalloc_runs + kRosAllocNumOfSizeBrackets, 1022 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1023 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1024 tlsPtr_.checkpoint_functions[i] = nullptr; 1025 } 1026} 1027 1028bool Thread::IsStillStarting() const { 1029 // You might think you can check whether the state is kStarting, but for much of thread startup, 1030 // the thread is in kNative; it might also be in kVmWait. 1031 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1032 // assigned fairly early on, and needs to be. 1033 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1034 // this thread _ever_ entered kRunnable". 1035 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1036 (*tlsPtr_.name == kThreadNameDuringStartup); 1037} 1038 1039void Thread::AssertNoPendingException() const { 1040 if (UNLIKELY(IsExceptionPending())) { 1041 ScopedObjectAccess soa(Thread::Current()); 1042 mirror::Throwable* exception = GetException(nullptr); 1043 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1044 } 1045} 1046 1047void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1048 if (UNLIKELY(IsExceptionPending())) { 1049 ScopedObjectAccess soa(Thread::Current()); 1050 mirror::Throwable* exception = GetException(nullptr); 1051 LOG(FATAL) << "Throwing new exception " << msg << " with unexpected pending exception: " 1052 << exception->Dump(); 1053 } 1054} 1055 1056static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1057 RootType /*root_type*/) 1058 NO_THREAD_SAFETY_ANALYSIS { 1059 Thread* self = reinterpret_cast<Thread*>(arg); 1060 mirror::Object* entered_monitor = *object; 1061 if (self->HoldsLock(entered_monitor)) { 1062 LOG(WARNING) << "Calling MonitorExit on object " 1063 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1064 << " left locked by native thread " 1065 << *Thread::Current() << " which is detaching"; 1066 entered_monitor->MonitorExit(self); 1067 } 1068} 1069 1070void Thread::Destroy() { 1071 Thread* self = this; 1072 DCHECK_EQ(self, Thread::Current()); 1073 1074 if (tlsPtr_.opeer != nullptr) { 1075 ScopedObjectAccess soa(self); 1076 // We may need to call user-supplied managed code, do this before final clean-up. 1077 HandleUncaughtExceptions(soa); 1078 RemoveFromThreadGroup(soa); 1079 1080 // this.nativePeer = 0; 1081 if (Runtime::Current()->IsActiveTransaction()) { 1082 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1083 ->SetLong<true>(tlsPtr_.opeer, 0); 1084 } else { 1085 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1086 ->SetLong<false>(tlsPtr_.opeer, 0); 1087 } 1088 Dbg::PostThreadDeath(self); 1089 1090 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1091 // who is waiting. 1092 mirror::Object* lock = 1093 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1094 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1095 if (lock != nullptr) { 1096 SirtRef<mirror::Object> sirt_obj(self, lock); 1097 ObjectLock<mirror::Object> locker(self, &sirt_obj); 1098 locker.NotifyAll(); 1099 } 1100 } 1101 1102 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1103 if (tlsPtr_.jni_env != nullptr) { 1104 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1105 } 1106} 1107 1108Thread::~Thread() { 1109 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1110 // If pthread_create fails we don't have a jni env here. 1111 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1112 tlsPtr_.jpeer = nullptr; 1113 } 1114 tlsPtr_.opeer = nullptr; 1115 1116 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1117 if (initialized) { 1118 delete tlsPtr_.jni_env; 1119 tlsPtr_.jni_env = nullptr; 1120 } 1121 CHECK_NE(GetState(), kRunnable); 1122 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1123 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1124 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1125 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1126 1127 // We may be deleting a still born thread. 1128 SetStateUnsafe(kTerminated); 1129 1130 delete wait_cond_; 1131 delete wait_mutex_; 1132 1133 if (tlsPtr_.long_jump_context != nullptr) { 1134 delete tlsPtr_.long_jump_context; 1135 } 1136 1137 if (initialized) { 1138 CleanupCpu(); 1139 } 1140 1141 delete tlsPtr_.debug_invoke_req; 1142 delete tlsPtr_.single_step_control; 1143 delete tlsPtr_.instrumentation_stack; 1144 delete tlsPtr_.name; 1145 delete tlsPtr_.stack_trace_sample; 1146 1147 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1148 1149 TearDownAlternateSignalStack(); 1150} 1151 1152void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1153 if (!IsExceptionPending()) { 1154 return; 1155 } 1156 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1157 ScopedThreadStateChange tsc(this, kNative); 1158 1159 // Get and clear the exception. 1160 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1161 tlsPtr_.jni_env->ExceptionClear(); 1162 1163 // If the thread has its own handler, use that. 1164 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1165 tlsPtr_.jni_env->GetObjectField(peer.get(), 1166 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1167 if (handler.get() == nullptr) { 1168 // Otherwise use the thread group's default handler. 1169 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1170 WellKnownClasses::java_lang_Thread_group)); 1171 } 1172 1173 // Call the handler. 1174 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1175 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1176 peer.get(), exception.get()); 1177 1178 // If the handler threw, clear that exception too. 1179 tlsPtr_.jni_env->ExceptionClear(); 1180} 1181 1182void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1183 // this.group.removeThread(this); 1184 // group can be null if we're in the compiler or a test. 1185 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1186 ->GetObject(tlsPtr_.opeer); 1187 if (ogroup != nullptr) { 1188 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1189 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1190 ScopedThreadStateChange tsc(soa.Self(), kNative); 1191 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1192 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1193 peer.get()); 1194 } 1195} 1196 1197size_t Thread::NumSirtReferences() { 1198 size_t count = 0; 1199 for (StackIndirectReferenceTable* cur = tlsPtr_.top_sirt; cur; cur = cur->GetLink()) { 1200 count += cur->NumberOfReferences(); 1201 } 1202 return count; 1203} 1204 1205bool Thread::SirtContains(jobject obj) const { 1206 StackReference<mirror::Object>* sirt_entry = 1207 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1208 for (StackIndirectReferenceTable* cur = tlsPtr_.top_sirt; cur; cur = cur->GetLink()) { 1209 if (cur->Contains(sirt_entry)) { 1210 return true; 1211 } 1212 } 1213 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1214 return tlsPtr_.managed_stack.ShadowFramesContain(sirt_entry); 1215} 1216 1217void Thread::SirtVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1218 for (StackIndirectReferenceTable* cur = tlsPtr_.top_sirt; cur; cur = cur->GetLink()) { 1219 size_t num_refs = cur->NumberOfReferences(); 1220 for (size_t j = 0; j < num_refs; ++j) { 1221 mirror::Object* object = cur->GetReference(j); 1222 if (object != nullptr) { 1223 mirror::Object* old_obj = object; 1224 visitor(&object, arg, thread_id, kRootNativeStack); 1225 if (old_obj != object) { 1226 cur->SetReference(j, object); 1227 } 1228 } 1229 } 1230 } 1231} 1232 1233mirror::Object* Thread::DecodeJObject(jobject obj) const { 1234 Locks::mutator_lock_->AssertSharedHeld(this); 1235 if (obj == nullptr) { 1236 return nullptr; 1237 } 1238 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1239 IndirectRefKind kind = GetIndirectRefKind(ref); 1240 mirror::Object* result; 1241 // The "kinds" below are sorted by the frequency we expect to encounter them. 1242 if (kind == kLocal) { 1243 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1244 result = locals.Get(ref); 1245 } else if (kind == kSirtOrInvalid) { 1246 // TODO: make stack indirect reference table lookup more efficient. 1247 // Check if this is a local reference in the SIRT. 1248 if (LIKELY(SirtContains(obj))) { 1249 // Read from SIRT. 1250 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1251 VerifyObject(result); 1252 } else { 1253 result = kInvalidIndirectRefObject; 1254 } 1255 } else if (kind == kGlobal) { 1256 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1257 IndirectReferenceTable& globals = vm->globals; 1258 ReaderMutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1259 result = const_cast<mirror::Object*>(globals.Get(ref)); 1260 } else { 1261 DCHECK_EQ(kind, kWeakGlobal); 1262 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1263 if (result == kClearedJniWeakGlobal) { 1264 // This is a special case where it's okay to return nullptr. 1265 return nullptr; 1266 } 1267 } 1268 1269 if (UNLIKELY(result == nullptr)) { 1270 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1271 } 1272 return result; 1273} 1274 1275// Implements java.lang.Thread.interrupted. 1276bool Thread::Interrupted() { 1277 MutexLock mu(Thread::Current(), *wait_mutex_); 1278 bool interrupted = IsInterruptedLocked(); 1279 SetInterruptedLocked(false); 1280 return interrupted; 1281} 1282 1283// Implements java.lang.Thread.isInterrupted. 1284bool Thread::IsInterrupted() { 1285 MutexLock mu(Thread::Current(), *wait_mutex_); 1286 return IsInterruptedLocked(); 1287} 1288 1289void Thread::Interrupt(Thread* self) { 1290 MutexLock mu(self, *wait_mutex_); 1291 if (interrupted_) { 1292 return; 1293 } 1294 interrupted_ = true; 1295 NotifyLocked(self); 1296} 1297 1298void Thread::Notify() { 1299 Thread* self = Thread::Current(); 1300 MutexLock mu(self, *wait_mutex_); 1301 NotifyLocked(self); 1302} 1303 1304void Thread::NotifyLocked(Thread* self) { 1305 if (wait_monitor_ != nullptr) { 1306 wait_cond_->Signal(self); 1307 } 1308} 1309 1310class CountStackDepthVisitor : public StackVisitor { 1311 public: 1312 explicit CountStackDepthVisitor(Thread* thread) 1313 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1314 : StackVisitor(thread, nullptr), 1315 depth_(0), skip_depth_(0), skipping_(true) {} 1316 1317 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1318 // We want to skip frames up to and including the exception's constructor. 1319 // Note we also skip the frame if it doesn't have a method (namely the callee 1320 // save frame) 1321 mirror::ArtMethod* m = GetMethod(); 1322 if (skipping_ && !m->IsRuntimeMethod() && 1323 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1324 skipping_ = false; 1325 } 1326 if (!skipping_) { 1327 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1328 ++depth_; 1329 } 1330 } else { 1331 ++skip_depth_; 1332 } 1333 return true; 1334 } 1335 1336 int GetDepth() const { 1337 return depth_; 1338 } 1339 1340 int GetSkipDepth() const { 1341 return skip_depth_; 1342 } 1343 1344 private: 1345 uint32_t depth_; 1346 uint32_t skip_depth_; 1347 bool skipping_; 1348}; 1349 1350template<bool kTransactionActive> 1351class BuildInternalStackTraceVisitor : public StackVisitor { 1352 public: 1353 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1354 : StackVisitor(thread, nullptr), self_(self), 1355 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1356 1357 bool Init(int depth) 1358 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1359 // Allocate method trace with an extra slot that will hold the PC trace 1360 SirtRef<mirror::ObjectArray<mirror::Object> > 1361 method_trace(self_, 1362 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1363 depth + 1)); 1364 if (method_trace.get() == nullptr) { 1365 return false; 1366 } 1367 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1368 if (dex_pc_trace == nullptr) { 1369 return false; 1370 } 1371 // Save PC trace in last element of method trace, also places it into the 1372 // object graph. 1373 // We are called from native: use non-transactional mode. 1374 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1375 // Set the Object*s and assert that no thread suspension is now possible. 1376 const char* last_no_suspend_cause = 1377 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1378 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1379 method_trace_ = method_trace.get(); 1380 dex_pc_trace_ = dex_pc_trace; 1381 return true; 1382 } 1383 1384 virtual ~BuildInternalStackTraceVisitor() { 1385 if (method_trace_ != nullptr) { 1386 self_->EndAssertNoThreadSuspension(nullptr); 1387 } 1388 } 1389 1390 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1391 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1392 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1393 } 1394 if (skip_depth_ > 0) { 1395 skip_depth_--; 1396 return true; 1397 } 1398 mirror::ArtMethod* m = GetMethod(); 1399 if (m->IsRuntimeMethod()) { 1400 return true; // Ignore runtime frames (in particular callee save). 1401 } 1402 method_trace_->Set<kTransactionActive>(count_, m); 1403 dex_pc_trace_->Set<kTransactionActive>(count_, 1404 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1405 ++count_; 1406 return true; 1407 } 1408 1409 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1410 return method_trace_; 1411 } 1412 1413 private: 1414 Thread* const self_; 1415 // How many more frames to skip. 1416 int32_t skip_depth_; 1417 // Current position down stack trace. 1418 uint32_t count_; 1419 // Array of dex PC values. 1420 mirror::IntArray* dex_pc_trace_; 1421 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1422 mirror::ObjectArray<mirror::Object>* method_trace_; 1423}; 1424 1425template<bool kTransactionActive> 1426jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1427 // Compute depth of stack 1428 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1429 count_visitor.WalkStack(); 1430 int32_t depth = count_visitor.GetDepth(); 1431 int32_t skip_depth = count_visitor.GetSkipDepth(); 1432 1433 // Build internal stack trace. 1434 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1435 const_cast<Thread*>(this), 1436 skip_depth); 1437 if (!build_trace_visitor.Init(depth)) { 1438 return nullptr; // Allocation failed. 1439 } 1440 build_trace_visitor.WalkStack(); 1441 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1442 if (kIsDebugBuild) { 1443 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1444 CHECK(trace->Get(i) != nullptr); 1445 } 1446 } 1447 return soa.AddLocalReference<jobjectArray>(trace); 1448} 1449template jobject Thread::CreateInternalStackTrace<false>(const ScopedObjectAccessUnchecked& soa) const; 1450template jobject Thread::CreateInternalStackTrace<true>(const ScopedObjectAccessUnchecked& soa) const; 1451 1452jobjectArray Thread::InternalStackTraceToStackTraceElementArray(const ScopedObjectAccess& soa, 1453 jobject internal, jobjectArray output_array, int* stack_depth) { 1454 // Decode the internal stack trace into the depth, method trace and PC trace 1455 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1456 1457 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1458 1459 jobjectArray result; 1460 1461 if (output_array != nullptr) { 1462 // Reuse the array we were given. 1463 result = output_array; 1464 // ...adjusting the number of frames we'll write to not exceed the array length. 1465 const int32_t traces_length = 1466 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1467 depth = std::min(depth, traces_length); 1468 } else { 1469 // Create java_trace array and place in local reference table 1470 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1471 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1472 if (java_traces == nullptr) { 1473 return nullptr; 1474 } 1475 result = soa.AddLocalReference<jobjectArray>(java_traces); 1476 } 1477 1478 if (stack_depth != nullptr) { 1479 *stack_depth = depth; 1480 } 1481 1482 for (int32_t i = 0; i < depth; ++i) { 1483 mirror::ObjectArray<mirror::Object>* method_trace = 1484 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1485 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1486 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1487 MethodHelper mh(method); 1488 int32_t line_number; 1489 SirtRef<mirror::String> class_name_object(soa.Self(), nullptr); 1490 SirtRef<mirror::String> source_name_object(soa.Self(), nullptr); 1491 if (method->IsProxyMethod()) { 1492 line_number = -1; 1493 class_name_object.reset(method->GetDeclaringClass()->GetName()); 1494 // source_name_object intentionally left null for proxy methods 1495 } else { 1496 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1497 uint32_t dex_pc = pc_trace->Get(i); 1498 line_number = mh.GetLineNumFromDexPC(dex_pc); 1499 // Allocate element, potentially triggering GC 1500 // TODO: reuse class_name_object via Class::name_? 1501 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1502 CHECK(descriptor != nullptr); 1503 std::string class_name(PrettyDescriptor(descriptor)); 1504 class_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1505 if (class_name_object.get() == nullptr) { 1506 return nullptr; 1507 } 1508 const char* source_file = mh.GetDeclaringClassSourceFile(); 1509 if (source_file != nullptr) { 1510 source_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1511 if (source_name_object.get() == nullptr) { 1512 return nullptr; 1513 } 1514 } 1515 } 1516 const char* method_name = mh.GetName(); 1517 CHECK(method_name != nullptr); 1518 SirtRef<mirror::String> method_name_object(soa.Self(), 1519 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1520 method_name)); 1521 if (method_name_object.get() == nullptr) { 1522 return nullptr; 1523 } 1524 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1525 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1526 if (obj == nullptr) { 1527 return nullptr; 1528 } 1529 // We are called from native: use non-transactional mode. 1530 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1531 } 1532 return result; 1533} 1534 1535void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1536 const char* exception_class_descriptor, const char* fmt, ...) { 1537 va_list args; 1538 va_start(args, fmt); 1539 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1540 fmt, args); 1541 va_end(args); 1542} 1543 1544void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1545 const char* exception_class_descriptor, 1546 const char* fmt, va_list ap) { 1547 std::string msg; 1548 StringAppendV(&msg, fmt, ap); 1549 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1550} 1551 1552void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1553 const char* msg) { 1554 // Callers should either clear or call ThrowNewWrappedException. 1555 AssertNoPendingExceptionForNewException(msg); 1556 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1557} 1558 1559void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1560 const char* exception_class_descriptor, 1561 const char* msg) { 1562 DCHECK_EQ(this, Thread::Current()); 1563 ScopedObjectAccessUnchecked soa(this); 1564 // Ensure we don't forget arguments over object allocation. 1565 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1566 SirtRef<mirror::ArtMethod> saved_throw_method(this, throw_location.GetMethod()); 1567 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1568 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1569 ClearException(); 1570 Runtime* runtime = Runtime::Current(); 1571 1572 mirror::ClassLoader* cl = nullptr; 1573 if (saved_throw_method.get() != nullptr) { 1574 cl = saved_throw_method.get()->GetDeclaringClass()->GetClassLoader(); 1575 } 1576 SirtRef<mirror::ClassLoader> class_loader(this, cl); 1577 SirtRef<mirror::Class> 1578 exception_class(this, runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1579 class_loader)); 1580 if (UNLIKELY(exception_class.get() == nullptr)) { 1581 CHECK(IsExceptionPending()); 1582 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1583 return; 1584 } 1585 1586 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1587 DCHECK(IsExceptionPending()); 1588 return; 1589 } 1590 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1591 SirtRef<mirror::Throwable> exception(this, 1592 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1593 1594 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1595 if (exception.get() == nullptr) { 1596 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1597 throw_location.GetDexPc()); 1598 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1599 return; 1600 } 1601 1602 // Choose an appropriate constructor and set up the arguments. 1603 const char* signature; 1604 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1605 if (msg != nullptr) { 1606 // Ensure we remember this and the method over the String allocation. 1607 msg_string.reset( 1608 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1609 if (UNLIKELY(msg_string.get() == nullptr)) { 1610 CHECK(IsExceptionPending()); // OOME. 1611 return; 1612 } 1613 if (cause.get() == nullptr) { 1614 signature = "(Ljava/lang/String;)V"; 1615 } else { 1616 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1617 } 1618 } else { 1619 if (cause.get() == nullptr) { 1620 signature = "()V"; 1621 } else { 1622 signature = "(Ljava/lang/Throwable;)V"; 1623 } 1624 } 1625 mirror::ArtMethod* exception_init_method = 1626 exception_class->FindDeclaredDirectMethod("<init>", signature); 1627 1628 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1629 << PrettyDescriptor(exception_class_descriptor); 1630 1631 if (UNLIKELY(!runtime->IsStarted())) { 1632 // Something is trying to throw an exception without a started runtime, which is the common 1633 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1634 // the exception fields directly. 1635 if (msg != nullptr) { 1636 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1637 } 1638 if (cause.get() != nullptr) { 1639 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1640 } 1641 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1642 throw_location.GetDexPc()); 1643 SetException(gc_safe_throw_location, exception.get()); 1644 } else { 1645 jvalue jv_args[2]; 1646 size_t i = 0; 1647 1648 if (msg != nullptr) { 1649 jv_args[i].l = msg_string.get(); 1650 ++i; 1651 } 1652 if (cause.get() != nullptr) { 1653 jv_args[i].l = cause.get(); 1654 ++i; 1655 } 1656 InvokeWithJValues(soa, exception.get(), soa.EncodeMethod(exception_init_method), jv_args); 1657 if (LIKELY(!IsExceptionPending())) { 1658 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1659 throw_location.GetDexPc()); 1660 SetException(gc_safe_throw_location, exception.get()); 1661 } 1662 } 1663} 1664 1665void Thread::ThrowOutOfMemoryError(const char* msg) { 1666 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1667 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1668 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1669 if (!tls32_.throwing_OutOfMemoryError) { 1670 tls32_.throwing_OutOfMemoryError = true; 1671 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1672 tls32_.throwing_OutOfMemoryError = false; 1673 } else { 1674 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1675 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1676 } 1677} 1678 1679Thread* Thread::CurrentFromGdb() { 1680 return Thread::Current(); 1681} 1682 1683void Thread::DumpFromGdb() const { 1684 std::ostringstream ss; 1685 Dump(ss); 1686 std::string str(ss.str()); 1687 // log to stderr for debugging command line processes 1688 std::cerr << str; 1689#ifdef HAVE_ANDROID_OS 1690 // log to logcat for debugging frameworks processes 1691 LOG(INFO) << str; 1692#endif 1693} 1694 1695// Explicitly instantiate 32 and 64bit thread offset dumping support. 1696template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1697template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1698 1699template<size_t ptr_size> 1700void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1701#define DO_THREAD_OFFSET(x, y) \ 1702 if (offset == x.Uint32Value()) { \ 1703 os << y; \ 1704 return; \ 1705 } 1706 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1707 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1708 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1709 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1710 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1711 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1712 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1713 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1714 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1715 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1716 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1717 DO_THREAD_OFFSET(TopSirtOffset<ptr_size>(), "top_sirt") 1718 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1719#undef DO_THREAD_OFFSET 1720 1721#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1722 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1723 os << #x; \ 1724 return; \ 1725 } 1726 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1727 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1728#undef INTERPRETER_ENTRY_POINT_INFO 1729 1730#define JNI_ENTRY_POINT_INFO(x) \ 1731 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1732 os << #x; \ 1733 return; \ 1734 } 1735 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1736#undef JNI_ENTRY_POINT_INFO 1737 1738#define PORTABLE_ENTRY_POINT_INFO(x) \ 1739 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1740 os << #x; \ 1741 return; \ 1742 } 1743 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1744 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1745 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1746#undef PORTABLE_ENTRY_POINT_INFO 1747 1748#define QUICK_ENTRY_POINT_INFO(x) \ 1749 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1750 os << #x; \ 1751 return; \ 1752 } 1753 QUICK_ENTRY_POINT_INFO(pAllocArray) 1754 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1755 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1756 QUICK_ENTRY_POINT_INFO(pAllocObject) 1757 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1758 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1759 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1760 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1761 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1762 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1763 QUICK_ENTRY_POINT_INFO(pCheckCast) 1764 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1765 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1766 QUICK_ENTRY_POINT_INFO(pInitializeType) 1767 QUICK_ENTRY_POINT_INFO(pResolveString) 1768 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1769 QUICK_ENTRY_POINT_INFO(pSet32Static) 1770 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1771 QUICK_ENTRY_POINT_INFO(pSet64Static) 1772 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1773 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1774 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1775 QUICK_ENTRY_POINT_INFO(pGet32Static) 1776 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1777 QUICK_ENTRY_POINT_INFO(pGet64Static) 1778 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1779 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1780 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1781 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1782 QUICK_ENTRY_POINT_INFO(pAputObject) 1783 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1784 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1785 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1786 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1787 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1788 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1789 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1790 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1791 QUICK_ENTRY_POINT_INFO(pLockObject) 1792 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1793 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1794 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1795 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1796 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1797 QUICK_ENTRY_POINT_INFO(pFmod) 1798 QUICK_ENTRY_POINT_INFO(pSqrt) 1799 QUICK_ENTRY_POINT_INFO(pL2d) 1800 QUICK_ENTRY_POINT_INFO(pFmodf) 1801 QUICK_ENTRY_POINT_INFO(pL2f) 1802 QUICK_ENTRY_POINT_INFO(pD2iz) 1803 QUICK_ENTRY_POINT_INFO(pF2iz) 1804 QUICK_ENTRY_POINT_INFO(pIdivmod) 1805 QUICK_ENTRY_POINT_INFO(pD2l) 1806 QUICK_ENTRY_POINT_INFO(pF2l) 1807 QUICK_ENTRY_POINT_INFO(pLdiv) 1808 QUICK_ENTRY_POINT_INFO(pLmod) 1809 QUICK_ENTRY_POINT_INFO(pLmul) 1810 QUICK_ENTRY_POINT_INFO(pShlLong) 1811 QUICK_ENTRY_POINT_INFO(pShrLong) 1812 QUICK_ENTRY_POINT_INFO(pUshrLong) 1813 QUICK_ENTRY_POINT_INFO(pIndexOf) 1814 QUICK_ENTRY_POINT_INFO(pMemcmp16) 1815 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1816 QUICK_ENTRY_POINT_INFO(pMemcpy) 1817 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1818 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1819 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1820 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1821 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1822 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1823 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1824 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1825 QUICK_ENTRY_POINT_INFO(pCheckSuspend) 1826 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1827 QUICK_ENTRY_POINT_INFO(pDeliverException) 1828 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1829 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1830 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1831 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1832 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1833#undef QUICK_ENTRY_POINT_INFO 1834 1835 os << offset; 1836} 1837 1838void Thread::QuickDeliverException() { 1839 // Get exception from thread. 1840 ThrowLocation throw_location; 1841 mirror::Throwable* exception = GetException(&throw_location); 1842 CHECK(exception != nullptr); 1843 // Don't leave exception visible while we try to find the handler, which may cause class 1844 // resolution. 1845 ClearException(); 1846 bool is_deoptimization = (exception == GetDeoptimizationException()); 1847 if (kDebugExceptionDelivery) { 1848 if (!is_deoptimization) { 1849 mirror::String* msg = exception->GetDetailMessage(); 1850 std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : ""); 1851 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1852 << ": " << str_msg << "\n"); 1853 } else { 1854 DumpStack(LOG(INFO) << "Deoptimizing: "); 1855 } 1856 } 1857 QuickExceptionHandler exception_handler(this, is_deoptimization); 1858 if (is_deoptimization) { 1859 exception_handler.DeoptimizeStack(); 1860 } else { 1861 exception_handler.FindCatch(throw_location, exception); 1862 } 1863 exception_handler.UpdateInstrumentationStack(); 1864 exception_handler.DoLongJump(); 1865 LOG(FATAL) << "UNREACHABLE"; 1866} 1867 1868Context* Thread::GetLongJumpContext() { 1869 Context* result = tlsPtr_.long_jump_context; 1870 if (result == nullptr) { 1871 result = Context::Create(); 1872 } else { 1873 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1874 result->Reset(); 1875 } 1876 return result; 1877} 1878 1879struct CurrentMethodVisitor FINAL : public StackVisitor { 1880 CurrentMethodVisitor(Thread* thread, Context* context) 1881 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1882 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1883 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1884 mirror::ArtMethod* m = GetMethod(); 1885 if (m->IsRuntimeMethod()) { 1886 // Continue if this is a runtime method. 1887 return true; 1888 } 1889 if (context_ != nullptr) { 1890 this_object_ = GetThisObject(); 1891 } 1892 method_ = m; 1893 dex_pc_ = GetDexPc(); 1894 return false; 1895 } 1896 mirror::Object* this_object_; 1897 mirror::ArtMethod* method_; 1898 uint32_t dex_pc_; 1899}; 1900 1901mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1902 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1903 visitor.WalkStack(false); 1904 if (dex_pc != nullptr) { 1905 *dex_pc = visitor.dex_pc_; 1906 } 1907 return visitor.method_; 1908} 1909 1910ThrowLocation Thread::GetCurrentLocationForThrow() { 1911 Context* context = GetLongJumpContext(); 1912 CurrentMethodVisitor visitor(this, context); 1913 visitor.WalkStack(false); 1914 ReleaseLongJumpContext(context); 1915 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1916} 1917 1918bool Thread::HoldsLock(mirror::Object* object) const { 1919 if (object == nullptr) { 1920 return false; 1921 } 1922 return object->GetLockOwnerThreadId() == GetThreadId(); 1923} 1924 1925// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1926template <typename RootVisitor> 1927class ReferenceMapVisitor : public StackVisitor { 1928 public: 1929 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1930 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1931 : StackVisitor(thread, context), visitor_(visitor) {} 1932 1933 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1934 if (false) { 1935 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1936 << StringPrintf("@ PC:%04x", GetDexPc()); 1937 } 1938 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1939 if (shadow_frame != nullptr) { 1940 VisitShadowFrame(shadow_frame); 1941 } else { 1942 VisitQuickFrame(); 1943 } 1944 return true; 1945 } 1946 1947 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1948 mirror::ArtMethod* m = shadow_frame->GetMethod(); 1949 size_t num_regs = shadow_frame->NumberOfVRegs(); 1950 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1951 // SIRT for JNI or References for interpreter. 1952 for (size_t reg = 0; reg < num_regs; ++reg) { 1953 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1954 if (ref != nullptr) { 1955 mirror::Object* new_ref = ref; 1956 visitor_(&new_ref, reg, this); 1957 if (new_ref != ref) { 1958 shadow_frame->SetVRegReference(reg, new_ref); 1959 } 1960 } 1961 } 1962 } else { 1963 // Java method. 1964 // Portable path use DexGcMap and store in Method.native_gc_map_. 1965 const uint8_t* gc_map = m->GetNativeGcMap(); 1966 CHECK(gc_map != nullptr) << PrettyMethod(m); 1967 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 1968 uint32_t dex_pc = shadow_frame->GetDexPC(); 1969 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 1970 DCHECK(reg_bitmap != nullptr); 1971 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 1972 for (size_t reg = 0; reg < num_regs; ++reg) { 1973 if (TestBitmap(reg, reg_bitmap)) { 1974 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1975 if (ref != nullptr) { 1976 mirror::Object* new_ref = ref; 1977 visitor_(&new_ref, reg, this); 1978 if (new_ref != ref) { 1979 shadow_frame->SetVRegReference(reg, new_ref); 1980 } 1981 } 1982 } 1983 } 1984 } 1985 } 1986 1987 private: 1988 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1989 mirror::ArtMethod* m = GetMethod(); 1990 // Process register map (which native and runtime methods don't have) 1991 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 1992 const uint8_t* native_gc_map = m->GetNativeGcMap(); 1993 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 1994 mh_.ChangeMethod(m); 1995 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 1996 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 1997 NativePcOffsetToReferenceMap map(native_gc_map); 1998 size_t num_regs = std::min(map.RegWidth() * 8, 1999 static_cast<size_t>(code_item->registers_size_)); 2000 if (num_regs > 0) { 2001 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 2002 DCHECK(reg_bitmap != nullptr); 2003 const VmapTable vmap_table(m->GetVmapTable()); 2004 uint32_t core_spills = m->GetCoreSpillMask(); 2005 uint32_t fp_spills = m->GetFpSpillMask(); 2006 size_t frame_size = m->GetFrameSizeInBytes(); 2007 // For all dex registers in the bitmap 2008 mirror::ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 2009 DCHECK(cur_quick_frame != nullptr); 2010 for (size_t reg = 0; reg < num_regs; ++reg) { 2011 // Does this register hold a reference? 2012 if (TestBitmap(reg, reg_bitmap)) { 2013 uint32_t vmap_offset; 2014 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2015 int vmap_reg = vmap_table.ComputeRegister(core_spills, vmap_offset, kReferenceVReg); 2016 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2017 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2018 if (*ref_addr != nullptr) { 2019 visitor_(ref_addr, reg, this); 2020 } 2021 } else { 2022 StackReference<mirror::Object>* ref_addr = 2023 reinterpret_cast<StackReference<mirror::Object>*>( 2024 GetVRegAddr(cur_quick_frame, code_item, core_spills, fp_spills, frame_size, 2025 reg)); 2026 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2027 if (ref != nullptr) { 2028 mirror::Object* new_ref = ref; 2029 visitor_(&new_ref, reg, this); 2030 if (ref != new_ref) { 2031 ref_addr->Assign(new_ref); 2032 } 2033 } 2034 } 2035 } 2036 } 2037 } 2038 } 2039 } 2040 2041 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2042 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2043 } 2044 2045 // Visitor for when we visit a root. 2046 const RootVisitor& visitor_; 2047 2048 // A method helper we keep around to avoid dex file/cache re-computations. 2049 MethodHelper mh_; 2050}; 2051 2052class RootCallbackVisitor { 2053 public: 2054 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2055 : callback_(callback), arg_(arg), tid_(tid) {} 2056 2057 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2058 callback_(obj, arg_, tid_, kRootJavaFrame); 2059 } 2060 2061 private: 2062 RootCallback* const callback_; 2063 void* const arg_; 2064 const uint32_t tid_; 2065}; 2066 2067void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2068 VerifyObject(class_loader_override); 2069 tlsPtr_.class_loader_override = class_loader_override; 2070} 2071 2072void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2073 uint32_t thread_id = GetThreadId(); 2074 if (tlsPtr_.opeer != nullptr) { 2075 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2076 } 2077 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2078 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2079 } 2080 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2081 if (tlsPtr_.class_loader_override != nullptr) { 2082 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, thread_id, 2083 kRootNativeStack); 2084 } 2085 if (tlsPtr_.monitor_enter_object != nullptr) { 2086 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2087 } 2088 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2089 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2090 SirtVisitRoots(visitor, arg, thread_id); 2091 if (tlsPtr_.debug_invoke_req != nullptr) { 2092 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2093 } 2094 if (tlsPtr_.single_step_control != nullptr) { 2095 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2096 } 2097 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2098 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2099 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2100 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2101 shadow_frame = shadow_frame->GetLink()) { 2102 mapper.VisitShadowFrame(shadow_frame); 2103 } 2104 } 2105 // Visit roots on this thread's stack 2106 Context* context = GetLongJumpContext(); 2107 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2108 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2109 mapper.WalkStack(); 2110 ReleaseLongJumpContext(context); 2111 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2112 if (frame.this_object_ != nullptr) { 2113 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2114 } 2115 DCHECK(frame.method_ != nullptr); 2116 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2117 } 2118} 2119 2120static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2121 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2122 VerifyObject(*root); 2123} 2124 2125void Thread::VerifyStackImpl() { 2126 UniquePtr<Context> context(Context::Create()); 2127 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2128 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2129 mapper.WalkStack(); 2130} 2131 2132// Set the stack end to that to be used during a stack overflow 2133void Thread::SetStackEndForStackOverflow() { 2134 // During stack overflow we allow use of the full stack. 2135 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2136 // However, we seem to have already extended to use the full stack. 2137 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2138 << kStackOverflowReservedBytes << ")?"; 2139 DumpStack(LOG(ERROR)); 2140 LOG(FATAL) << "Recursive stack overflow."; 2141 } 2142 2143 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2144} 2145 2146void Thread::SetTlab(byte* start, byte* end) { 2147 DCHECK_LE(start, end); 2148 tlsPtr_.thread_local_start = start; 2149 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2150 tlsPtr_.thread_local_end = end; 2151 tlsPtr_.thread_local_objects = 0; 2152} 2153 2154bool Thread::HasTlab() const { 2155 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2156 if (has_tlab) { 2157 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2158 } else { 2159 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2160 } 2161 return has_tlab; 2162} 2163 2164std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2165 thread.ShortDump(os); 2166 return os; 2167} 2168 2169} // namespace art 2170