thread.cc revision ffddfdf6fec0b9d98a692e27242eecb15af5ead2
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 "handle_scope.h" 48#include "indirect_reference_table-inl.h" 49#include "jni_internal.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class-inl.h" 53#include "mirror/class_loader.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/stack_trace_element.h" 56#include "monitor.h" 57#include "object_utils.h" 58#include "quick_exception_handler.h" 59#include "quick/quick_method_frame_info.h" 60#include "reflection.h" 61#include "runtime.h" 62#include "scoped_thread_state_change.h" 63#include "ScopedLocalRef.h" 64#include "ScopedUtfChars.h" 65#include "handle_scope-inl.h" 66#include "stack.h" 67#include "thread-inl.h" 68#include "thread_list.h" 69#include "utils.h" 70#include "verifier/dex_gc_map.h" 71#include "verify_object-inl.h" 72#include "vmap_table.h" 73#include "well_known_classes.h" 74 75namespace art { 76 77bool Thread::is_started_ = false; 78pthread_key_t Thread::pthread_key_self_; 79ConditionVariable* Thread::resume_cond_ = nullptr; 80 81static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 82 83void Thread::InitCardTable() { 84 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 85} 86 87static void UnimplementedEntryPoint() { 88 UNIMPLEMENTED(FATAL); 89} 90 91void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 92 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 93 94void Thread::InitTlsEntryPoints() { 95 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 96 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 97 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + 98 sizeof(tlsPtr_.quick_entrypoints)); 99 for (uintptr_t* it = begin; it != end; ++it) { 100 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 101 } 102 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 103 &tlsPtr_.portable_entrypoints, &tlsPtr_.quick_entrypoints); 104} 105 106void Thread::ResetQuickAllocEntryPointsForThread() { 107 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 108} 109 110void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 111 tlsPtr_.deoptimization_shadow_frame = sf; 112} 113 114void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 115 tls64_.deoptimization_return_value.SetJ(ret_val.GetJ()); 116} 117 118ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 119 ShadowFrame* sf = tlsPtr_.deoptimization_shadow_frame; 120 tlsPtr_.deoptimization_shadow_frame = nullptr; 121 ret_val->SetJ(tls64_.deoptimization_return_value.GetJ()); 122 return sf; 123} 124 125void Thread::InitTid() { 126 tls32_.tid = ::art::GetTid(); 127} 128 129void Thread::InitAfterFork() { 130 // One thread (us) survived the fork, but we have a new tid so we need to 131 // update the value stashed in this Thread*. 132 InitTid(); 133} 134 135void* Thread::CreateCallback(void* arg) { 136 Thread* self = reinterpret_cast<Thread*>(arg); 137 Runtime* runtime = Runtime::Current(); 138 if (runtime == nullptr) { 139 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 140 return nullptr; 141 } 142 { 143 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 144 // after self->Init(). 145 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 146 // Check that if we got here we cannot be shutting down (as shutdown should never have started 147 // while threads are being born). 148 CHECK(!runtime->IsShuttingDownLocked()); 149 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 150 Runtime::Current()->EndThreadBirth(); 151 } 152 { 153 ScopedObjectAccess soa(self); 154 155 // Copy peer into self, deleting global reference when done. 156 CHECK(self->tlsPtr_.jpeer != nullptr); 157 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 158 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 159 self->tlsPtr_.jpeer = nullptr; 160 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 161 Dbg::PostThreadStart(self); 162 163 // Invoke the 'run' method of our java.lang.Thread. 164 mirror::Object* receiver = self->tlsPtr_.opeer; 165 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 166 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 167 } 168 // Detach and delete self. 169 Runtime::Current()->GetThreadList()->Unregister(self); 170 171 return nullptr; 172} 173 174Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 175 mirror::Object* thread_peer) { 176 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 177 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 178 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 179 // to stop it from going away. 180 if (kIsDebugBuild) { 181 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 182 if (result != nullptr && !result->IsSuspended()) { 183 Locks::thread_list_lock_->AssertHeld(soa.Self()); 184 } 185 } 186 return result; 187} 188 189Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 190 jobject java_thread) { 191 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 192} 193 194static size_t FixStackSize(size_t stack_size) { 195 // A stack size of zero means "use the default". 196 if (stack_size == 0) { 197 stack_size = Runtime::Current()->GetDefaultStackSize(); 198 } 199 200 // Dalvik used the bionic pthread default stack size for native threads, 201 // so include that here to support apps that expect large native stacks. 202 stack_size += 1 * MB; 203 204 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 205 if (stack_size < PTHREAD_STACK_MIN) { 206 stack_size = PTHREAD_STACK_MIN; 207 } 208 209 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 210 // It's likely that callers are trying to ensure they have at least a certain amount of 211 // stack space, so we should add our reserved space on top of what they requested, rather 212 // than implicitly take it away from them. 213 stack_size += Thread::kStackOverflowReservedBytes; 214 } else { 215 // If we are going to use implicit stack checks, allocate space for the protected 216 // region at the bottom of the stack. 217 stack_size += Thread::kStackOverflowImplicitCheckSize; 218 } 219 220 // Some systems require the stack size to be a multiple of the system page size, so round up. 221 stack_size = RoundUp(stack_size, kPageSize); 222 223 return stack_size; 224} 225 226// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 227// overflow is detected. It is located right below the stack_end_. Just below that 228// is the StackOverflow reserved region used when creating the StackOverflow 229// exception. 230void Thread::InstallImplicitProtection(bool is_main_stack) { 231 byte* pregion = tlsPtr_.stack_end; 232 233 constexpr uint32_t kMarker = 0xdadadada; 234 uintptr_t *marker = reinterpret_cast<uintptr_t*>(pregion); 235 if (*marker == kMarker) { 236 // The region has already been set up. 237 return; 238 } 239 // Add marker so that we can detect a second attempt to do this. 240 *marker = kMarker; 241 242 pregion -= kStackOverflowProtectedSize; 243 244 // Touch the pages in the region to map them in. Otherwise mprotect fails. Only 245 // need to do this on the main stack. We only need to touch one byte per page. 246 if (is_main_stack) { 247 byte* start = pregion; 248 byte* end = pregion + kStackOverflowProtectedSize; 249 while (start < end) { 250 *start = static_cast<byte>(0); 251 start += kPageSize; 252 } 253 } 254 255 VLOG(threads) << "installing stack protected region at " << std::hex << 256 static_cast<void*>(pregion) << " to " << 257 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 258 259 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 260 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. Reason:" 261 << strerror(errno); 262 } 263 264 // Tell the kernel that we won't be needing these pages any more. 265 if (is_main_stack) { 266 madvise(pregion, kStackOverflowProtectedSize, MADV_DONTNEED); 267 } 268} 269 270void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 271 CHECK(java_peer != nullptr); 272 Thread* self = static_cast<JNIEnvExt*>(env)->self; 273 Runtime* runtime = Runtime::Current(); 274 275 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 276 bool thread_start_during_shutdown = false; 277 { 278 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 279 if (runtime->IsShuttingDownLocked()) { 280 thread_start_during_shutdown = true; 281 } else { 282 runtime->StartThreadBirth(); 283 } 284 } 285 if (thread_start_during_shutdown) { 286 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 287 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 288 return; 289 } 290 291 Thread* child_thread = new Thread(is_daemon); 292 // Use global JNI ref to hold peer live while child thread starts. 293 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 294 stack_size = FixStackSize(stack_size); 295 296 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 297 // assign it. 298 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 299 reinterpret_cast<jlong>(child_thread)); 300 301 pthread_t new_pthread; 302 pthread_attr_t attr; 303 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 304 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 305 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 306 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 307 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 308 309 if (pthread_create_result != 0) { 310 // pthread_create(3) failed, so clean up. 311 { 312 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 313 runtime->EndThreadBirth(); 314 } 315 // Manually delete the global reference since Thread::Init will not have been run. 316 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 317 child_thread->tlsPtr_.jpeer = nullptr; 318 delete child_thread; 319 child_thread = nullptr; 320 // TODO: remove from thread group? 321 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 322 { 323 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 324 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 325 ScopedObjectAccess soa(env); 326 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 327 } 328 } 329} 330 331void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 332 // This function does all the initialization that must be run by the native thread it applies to. 333 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 334 // we can handshake with the corresponding native thread when it's ready.) Check this native 335 // thread hasn't been through here already... 336 CHECK(Thread::Current() == nullptr); 337 SetUpAlternateSignalStack(); 338 InitCpu(); 339 InitTlsEntryPoints(); 340 RemoveSuspendTrigger(); 341 InitCardTable(); 342 InitTid(); 343 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 344 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 345 tlsPtr_.pthread_self = pthread_self(); 346 CHECK(is_started_); 347 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 348 DCHECK_EQ(Thread::Current(), this); 349 350 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 351 InitStackHwm(); 352 353 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 354 thread_list->Register(this); 355} 356 357Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 358 bool create_peer) { 359 Thread* self; 360 Runtime* runtime = Runtime::Current(); 361 if (runtime == nullptr) { 362 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 363 return nullptr; 364 } 365 { 366 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 367 if (runtime->IsShuttingDownLocked()) { 368 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 369 return nullptr; 370 } else { 371 Runtime::Current()->StartThreadBirth(); 372 self = new Thread(as_daemon); 373 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 374 Runtime::Current()->EndThreadBirth(); 375 } 376 } 377 378 CHECK_NE(self->GetState(), kRunnable); 379 self->SetState(kNative); 380 381 // If we're the main thread, ClassLinker won't be created until after we're attached, 382 // so that thread needs a two-stage attach. Regular threads don't need this hack. 383 // In the compiler, all threads need this hack, because no-one's going to be getting 384 // a native peer! 385 if (create_peer) { 386 self->CreatePeer(thread_name, as_daemon, thread_group); 387 } else { 388 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 389 if (thread_name != nullptr) { 390 self->tlsPtr_.name->assign(thread_name); 391 ::art::SetThreadName(thread_name); 392 } 393 } 394 395 return self; 396} 397 398void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 399 Runtime* runtime = Runtime::Current(); 400 CHECK(runtime->IsStarted()); 401 JNIEnv* env = tlsPtr_.jni_env; 402 403 if (thread_group == nullptr) { 404 thread_group = runtime->GetMainThreadGroup(); 405 } 406 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 407 jint thread_priority = GetNativePriority(); 408 jboolean thread_is_daemon = as_daemon; 409 410 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 411 if (peer.get() == nullptr) { 412 CHECK(IsExceptionPending()); 413 return; 414 } 415 { 416 ScopedObjectAccess soa(this); 417 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 418 } 419 env->CallNonvirtualVoidMethod(peer.get(), 420 WellKnownClasses::java_lang_Thread, 421 WellKnownClasses::java_lang_Thread_init, 422 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 423 AssertNoPendingException(); 424 425 Thread* self = this; 426 DCHECK_EQ(self, Thread::Current()); 427 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 428 reinterpret_cast<jlong>(self)); 429 430 ScopedObjectAccess soa(self); 431 StackHandleScope<1> hs(self); 432 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 433 if (peer_thread_name.Get() == nullptr) { 434 // The Thread constructor should have set the Thread.name to a 435 // non-null value. However, because we can run without code 436 // available (in the compiler, in tests), we manually assign the 437 // fields the constructor should have set. 438 if (runtime->IsActiveTransaction()) { 439 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 440 } else { 441 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 442 } 443 peer_thread_name.Assign(GetThreadName(soa)); 444 } 445 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 446 if (peer_thread_name.Get() != nullptr) { 447 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 448 } 449} 450 451template<bool kTransactionActive> 452void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 453 jobject thread_name, jint thread_priority) { 454 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 455 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 456 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 457 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 458 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 459 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 460 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 461 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 462} 463 464void Thread::SetThreadName(const char* name) { 465 tlsPtr_.name->assign(name); 466 ::art::SetThreadName(name); 467 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 468} 469 470void Thread::InitStackHwm() { 471 void* read_stack_base; 472 size_t read_stack_size; 473 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 474 475 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 476 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 477 PrettySize(read_stack_size).c_str()); 478 479 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 480 tlsPtr_.stack_size = read_stack_size; 481 482 if (read_stack_size <= kStackOverflowReservedBytes) { 483 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 484 << " bytes)"; 485 } 486 487 // TODO: move this into the Linux GetThreadStack implementation. 488#if !defined(__APPLE__) 489 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 490 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 491 // will be broken because we'll die long before we get close to 2GB. 492 bool is_main_thread = (::art::GetTid() == getpid()); 493 if (is_main_thread) { 494 rlimit stack_limit; 495 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 496 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 497 } 498 if (stack_limit.rlim_cur == RLIM_INFINITY) { 499 // Find the default stack size for new threads... 500 pthread_attr_t default_attributes; 501 size_t default_stack_size; 502 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 503 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 504 "default stack size query"); 505 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 506 507 // ...and use that as our limit. 508 size_t old_stack_size = read_stack_size; 509 tlsPtr_.stack_size = default_stack_size; 510 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 511 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 512 << " to " << PrettySize(default_stack_size) 513 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 514 } 515 } 516#endif 517 518 // Set stack_end_ to the bottom of the stack saving space of stack overflows 519 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 520 ResetDefaultStackEnd(implicit_stack_check); 521 522 // Install the protected region if we are doing implicit overflow checks. 523 if (implicit_stack_check) { 524 if (is_main_thread) { 525 // The main thread has a 16K protected region at the bottom. We need 526 // to install our own region so we need to move the limits 527 // of the stack to make room for it. 528 constexpr uint32_t kDelta = 16 * KB; 529 tlsPtr_.stack_begin += kDelta; 530 tlsPtr_.stack_end += kDelta; 531 tlsPtr_.stack_size -= kDelta; 532 } 533 InstallImplicitProtection(is_main_thread); 534 } 535 536 // Sanity check. 537 int stack_variable; 538 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 539} 540 541void Thread::ShortDump(std::ostream& os) const { 542 os << "Thread["; 543 if (GetThreadId() != 0) { 544 // If we're in kStarting, we won't have a thin lock id or tid yet. 545 os << GetThreadId() 546 << ",tid=" << GetTid() << ','; 547 } 548 os << GetState() 549 << ",Thread*=" << this 550 << ",peer=" << tlsPtr_.opeer 551 << ",\"" << *tlsPtr_.name << "\"" 552 << "]"; 553} 554 555void Thread::Dump(std::ostream& os) const { 556 DumpState(os); 557 DumpStack(os); 558} 559 560mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 561 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 562 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 563} 564 565void Thread::GetThreadName(std::string& name) const { 566 name.assign(*tlsPtr_.name); 567} 568 569uint64_t Thread::GetCpuMicroTime() const { 570#if defined(HAVE_POSIX_CLOCKS) 571 clockid_t cpu_clock_id; 572 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 573 timespec now; 574 clock_gettime(cpu_clock_id, &now); 575 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 576#else 577 UNIMPLEMENTED(WARNING); 578 return -1; 579#endif 580} 581 582void Thread::AtomicSetFlag(ThreadFlag flag) { 583 android_atomic_or(flag, &tls32_.state_and_flags.as_int); 584} 585 586void Thread::AtomicClearFlag(ThreadFlag flag) { 587 android_atomic_and(-1 ^ flag, &tls32_.state_and_flags.as_int); 588} 589 590// Attempt to rectify locks so that we dump thread list with required locks before exiting. 591static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 592 LOG(ERROR) << *thread << " suspend count already zero."; 593 Locks::thread_suspend_count_lock_->Unlock(self); 594 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 595 Locks::mutator_lock_->SharedTryLock(self); 596 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 597 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 598 } 599 } 600 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 601 Locks::thread_list_lock_->TryLock(self); 602 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 603 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 604 } 605 } 606 std::ostringstream ss; 607 Runtime::Current()->GetThreadList()->DumpLocked(ss); 608 LOG(FATAL) << ss.str(); 609} 610 611void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 612 if (kIsDebugBuild) { 613 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 614 << delta << " " << tls32_.debug_suspend_count << " " << this; 615 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 616 Locks::thread_suspend_count_lock_->AssertHeld(self); 617 if (this != self && !IsSuspended()) { 618 Locks::thread_list_lock_->AssertHeld(self); 619 } 620 } 621 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 622 UnsafeLogFatalForSuspendCount(self, this); 623 return; 624 } 625 626 tls32_.suspend_count += delta; 627 if (for_debugger) { 628 tls32_.debug_suspend_count += delta; 629 } 630 631 if (tls32_.suspend_count == 0) { 632 AtomicClearFlag(kSuspendRequest); 633 } else { 634 AtomicSetFlag(kSuspendRequest); 635 TriggerSuspend(); 636 } 637} 638 639void Thread::RunCheckpointFunction() { 640 Closure *checkpoints[kMaxCheckpoints]; 641 642 // Grab the suspend_count lock and copy the current set of 643 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 644 // function will also grab this lock so we prevent a race between setting 645 // the kCheckpointRequest flag and clearing it. 646 { 647 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 648 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 649 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 650 tlsPtr_.checkpoint_functions[i] = nullptr; 651 } 652 AtomicClearFlag(kCheckpointRequest); 653 } 654 655 // Outside the lock, run all the checkpoint functions that 656 // we collected. 657 bool found_checkpoint = false; 658 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 659 if (checkpoints[i] != nullptr) { 660 ATRACE_BEGIN("Checkpoint function"); 661 checkpoints[i]->Run(this); 662 ATRACE_END(); 663 found_checkpoint = true; 664 } 665 } 666 CHECK(found_checkpoint); 667} 668 669bool Thread::RequestCheckpoint(Closure* function) { 670 union StateAndFlags old_state_and_flags; 671 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 672 if (old_state_and_flags.as_struct.state != kRunnable) { 673 return false; // Fail, thread is suspended and so can't run a checkpoint. 674 } 675 676 uint32_t available_checkpoint = kMaxCheckpoints; 677 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 678 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 679 available_checkpoint = i; 680 break; 681 } 682 } 683 if (available_checkpoint == kMaxCheckpoints) { 684 // No checkpoint functions available, we can't run a checkpoint 685 return false; 686 } 687 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 688 689 // Checkpoint function installed now install flag bit. 690 // We must be runnable to request a checkpoint. 691 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 692 union StateAndFlags new_state_and_flags; 693 new_state_and_flags.as_int = old_state_and_flags.as_int; 694 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 695 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 696 &tls32_.state_and_flags.as_int); 697 if (UNLIKELY(succeeded != 0)) { 698 // The thread changed state before the checkpoint was installed. 699 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 700 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 701 } else { 702 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 703 TriggerSuspend(); 704 } 705 return succeeded == 0; 706} 707 708void Thread::FullSuspendCheck() { 709 VLOG(threads) << this << " self-suspending"; 710 ATRACE_BEGIN("Full suspend check"); 711 // Make thread appear suspended to other threads, release mutator_lock_. 712 TransitionFromRunnableToSuspended(kSuspended); 713 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 714 TransitionFromSuspendedToRunnable(); 715 ATRACE_END(); 716 VLOG(threads) << this << " self-reviving"; 717} 718 719void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 720 std::string group_name; 721 int priority; 722 bool is_daemon = false; 723 Thread* self = Thread::Current(); 724 725 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 726 // cause ScopedObjectAccessUnchecked to deadlock. 727 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 728 ScopedObjectAccessUnchecked soa(self); 729 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 730 ->GetInt(thread->tlsPtr_.opeer); 731 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 732 ->GetBoolean(thread->tlsPtr_.opeer); 733 734 mirror::Object* thread_group = 735 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 736 737 if (thread_group != nullptr) { 738 mirror::ArtField* group_name_field = 739 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 740 mirror::String* group_name_string = 741 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 742 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 743 } 744 } else { 745 priority = GetNativePriority(); 746 } 747 748 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 749 if (scheduler_group_name.empty()) { 750 scheduler_group_name = "default"; 751 } 752 753 if (thread != nullptr) { 754 os << '"' << *thread->tlsPtr_.name << '"'; 755 if (is_daemon) { 756 os << " daemon"; 757 } 758 os << " prio=" << priority 759 << " tid=" << thread->GetThreadId() 760 << " " << thread->GetState(); 761 if (thread->IsStillStarting()) { 762 os << " (still starting up)"; 763 } 764 os << "\n"; 765 } else { 766 os << '"' << ::art::GetThreadName(tid) << '"' 767 << " prio=" << priority 768 << " (not attached)\n"; 769 } 770 771 if (thread != nullptr) { 772 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 773 os << " | group=\"" << group_name << "\"" 774 << " sCount=" << thread->tls32_.suspend_count 775 << " dsCount=" << thread->tls32_.debug_suspend_count 776 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 777 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 778 } 779 780 os << " | sysTid=" << tid 781 << " nice=" << getpriority(PRIO_PROCESS, tid) 782 << " cgrp=" << scheduler_group_name; 783 if (thread != nullptr) { 784 int policy; 785 sched_param sp; 786 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 787 __FUNCTION__); 788 os << " sched=" << policy << "/" << sp.sched_priority 789 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 790 } 791 os << "\n"; 792 793 // Grab the scheduler stats for this thread. 794 std::string scheduler_stats; 795 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 796 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 797 } else { 798 scheduler_stats = "0 0 0"; 799 } 800 801 char native_thread_state = '?'; 802 int utime = 0; 803 int stime = 0; 804 int task_cpu = 0; 805 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 806 807 os << " | state=" << native_thread_state 808 << " schedstat=( " << scheduler_stats << " )" 809 << " utm=" << utime 810 << " stm=" << stime 811 << " core=" << task_cpu 812 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 813 if (thread != nullptr) { 814 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 815 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 816 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 817 } 818} 819 820void Thread::DumpState(std::ostream& os) const { 821 Thread::DumpState(os, this, GetTid()); 822} 823 824struct StackDumpVisitor : public StackVisitor { 825 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 826 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 827 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 828 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 829 } 830 831 virtual ~StackDumpVisitor() { 832 if (frame_count == 0) { 833 os << " (no managed stack frames)\n"; 834 } 835 } 836 837 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 838 mirror::ArtMethod* m = GetMethod(); 839 if (m->IsRuntimeMethod()) { 840 return true; 841 } 842 const int kMaxRepetition = 3; 843 mirror::Class* c = m->GetDeclaringClass(); 844 mirror::DexCache* dex_cache = c->GetDexCache(); 845 int line_number = -1; 846 if (dex_cache != nullptr) { // be tolerant of bad input 847 const DexFile& dex_file = *dex_cache->GetDexFile(); 848 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 849 } 850 if (line_number == last_line_number && last_method == m) { 851 ++repetition_count; 852 } else { 853 if (repetition_count >= kMaxRepetition) { 854 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 855 } 856 repetition_count = 0; 857 last_line_number = line_number; 858 last_method = m; 859 } 860 if (repetition_count < kMaxRepetition) { 861 os << " at " << PrettyMethod(m, false); 862 if (m->IsNative()) { 863 os << "(Native method)"; 864 } else { 865 mh.ChangeMethod(m); 866 const char* source_file(mh.GetDeclaringClassSourceFile()); 867 os << "(" << (source_file != nullptr ? source_file : "unavailable") 868 << ":" << line_number << ")"; 869 } 870 os << "\n"; 871 if (frame_count == 0) { 872 Monitor::DescribeWait(os, thread); 873 } 874 if (can_allocate) { 875 Monitor::VisitLocks(this, DumpLockedObject, &os); 876 } 877 } 878 879 ++frame_count; 880 return true; 881 } 882 883 static void DumpLockedObject(mirror::Object* o, void* context) 884 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 885 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 886 os << " - locked "; 887 if (o == nullptr) { 888 os << "an unknown object"; 889 } else { 890 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 891 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 892 // Getting the identity hashcode here would result in lock inflation and suspension of the 893 // current thread, which isn't safe if this is the only runnable thread. 894 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 895 PrettyTypeOf(o).c_str()); 896 } else { 897 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 898 } 899 } 900 os << "\n"; 901 } 902 903 std::ostream& os; 904 const Thread* thread; 905 const bool can_allocate; 906 MethodHelper mh; 907 mirror::ArtMethod* last_method; 908 int last_line_number; 909 int repetition_count; 910 int frame_count; 911}; 912 913static bool ShouldShowNativeStack(const Thread* thread) 914 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 915 ThreadState state = thread->GetState(); 916 917 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 918 if (state > kWaiting && state < kStarting) { 919 return true; 920 } 921 922 // In an Object.wait variant or Thread.sleep? That's not interesting. 923 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 924 return false; 925 } 926 927 // In some other native method? That's interesting. 928 // We don't just check kNative because native methods will be in state kSuspended if they're 929 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 930 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 931 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 932 return current_method != nullptr && current_method->IsNative(); 933} 934 935void Thread::DumpJavaStack(std::ostream& os) const { 936 std::unique_ptr<Context> context(Context::Create()); 937 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 938 !tls32_.throwing_OutOfMemoryError); 939 dumper.WalkStack(); 940} 941 942void Thread::DumpStack(std::ostream& os) const { 943 // TODO: we call this code when dying but may not have suspended the thread ourself. The 944 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 945 // the race with the thread_suspend_count_lock_). 946 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 947 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 948 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 949 // If we're currently in native code, dump that stack before dumping the managed stack. 950 if (dump_for_abort || ShouldShowNativeStack(this)) { 951 DumpKernelStack(os, GetTid(), " kernel: ", false); 952 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr)); 953 } 954 DumpJavaStack(os); 955 } else { 956 os << "Not able to dump stack of thread that isn't suspended"; 957 } 958} 959 960void Thread::ThreadExitCallback(void* arg) { 961 Thread* self = reinterpret_cast<Thread*>(arg); 962 if (self->tls32_.thread_exit_check_count == 0) { 963 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 964 "going to use a pthread_key_create destructor?): " << *self; 965 CHECK(is_started_); 966 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 967 self->tls32_.thread_exit_check_count = 1; 968 } else { 969 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 970 } 971} 972 973void Thread::Startup() { 974 CHECK(!is_started_); 975 is_started_ = true; 976 { 977 // MutexLock to keep annotalysis happy. 978 // 979 // Note we use nullptr for the thread because Thread::Current can 980 // return garbage since (is_started_ == true) and 981 // Thread::pthread_key_self_ is not yet initialized. 982 // This was seen on glibc. 983 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 984 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 985 *Locks::thread_suspend_count_lock_); 986 } 987 988 // Allocate a TLS slot. 989 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 990 991 // Double-check the TLS slot allocation. 992 if (pthread_getspecific(pthread_key_self_) != nullptr) { 993 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 994 } 995} 996 997void Thread::FinishStartup() { 998 Runtime* runtime = Runtime::Current(); 999 CHECK(runtime->IsStarted()); 1000 1001 // Finish attaching the main thread. 1002 ScopedObjectAccess soa(Thread::Current()); 1003 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1004 1005 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1006} 1007 1008void Thread::Shutdown() { 1009 CHECK(is_started_); 1010 is_started_ = false; 1011 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1012 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1013 if (resume_cond_ != nullptr) { 1014 delete resume_cond_; 1015 resume_cond_ = nullptr; 1016 } 1017} 1018 1019Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1020 wait_mutex_ = new Mutex("a thread wait mutex"); 1021 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1022 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1023 tlsPtr_.single_step_control = new SingleStepControl; 1024 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1025 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1026 1027 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1028 tls32_.state_and_flags.as_struct.flags = 0; 1029 tls32_.state_and_flags.as_struct.state = kNative; 1030 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1031 std::fill(tlsPtr_.rosalloc_runs, 1032 tlsPtr_.rosalloc_runs + gc::allocator::RosAlloc::kNumThreadLocalSizeBrackets, 1033 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1034 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1035 tlsPtr_.checkpoint_functions[i] = nullptr; 1036 } 1037} 1038 1039bool Thread::IsStillStarting() const { 1040 // You might think you can check whether the state is kStarting, but for much of thread startup, 1041 // the thread is in kNative; it might also be in kVmWait. 1042 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1043 // assigned fairly early on, and needs to be. 1044 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1045 // this thread _ever_ entered kRunnable". 1046 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1047 (*tlsPtr_.name == kThreadNameDuringStartup); 1048} 1049 1050void Thread::AssertNoPendingException() const { 1051 if (UNLIKELY(IsExceptionPending())) { 1052 ScopedObjectAccess soa(Thread::Current()); 1053 mirror::Throwable* exception = GetException(nullptr); 1054 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1055 } 1056} 1057 1058void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1059 if (UNLIKELY(IsExceptionPending())) { 1060 ScopedObjectAccess soa(Thread::Current()); 1061 mirror::Throwable* exception = GetException(nullptr); 1062 LOG(FATAL) << "Throwing new exception " << msg << " with unexpected pending exception: " 1063 << exception->Dump(); 1064 } 1065} 1066 1067static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1068 RootType /*root_type*/) 1069 NO_THREAD_SAFETY_ANALYSIS { 1070 Thread* self = reinterpret_cast<Thread*>(arg); 1071 mirror::Object* entered_monitor = *object; 1072 if (self->HoldsLock(entered_monitor)) { 1073 LOG(WARNING) << "Calling MonitorExit on object " 1074 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1075 << " left locked by native thread " 1076 << *Thread::Current() << " which is detaching"; 1077 entered_monitor->MonitorExit(self); 1078 } 1079} 1080 1081void Thread::Destroy() { 1082 Thread* self = this; 1083 DCHECK_EQ(self, Thread::Current()); 1084 1085 if (tlsPtr_.opeer != nullptr) { 1086 ScopedObjectAccess soa(self); 1087 // We may need to call user-supplied managed code, do this before final clean-up. 1088 HandleUncaughtExceptions(soa); 1089 RemoveFromThreadGroup(soa); 1090 1091 // this.nativePeer = 0; 1092 if (Runtime::Current()->IsActiveTransaction()) { 1093 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1094 ->SetLong<true>(tlsPtr_.opeer, 0); 1095 } else { 1096 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1097 ->SetLong<false>(tlsPtr_.opeer, 0); 1098 } 1099 Dbg::PostThreadDeath(self); 1100 1101 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1102 // who is waiting. 1103 mirror::Object* lock = 1104 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1105 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1106 if (lock != nullptr) { 1107 StackHandleScope<1> hs(self); 1108 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1109 ObjectLock<mirror::Object> locker(self, h_obj); 1110 locker.NotifyAll(); 1111 } 1112 } 1113 1114 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1115 if (tlsPtr_.jni_env != nullptr) { 1116 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1117 } 1118} 1119 1120Thread::~Thread() { 1121 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1122 // If pthread_create fails we don't have a jni env here. 1123 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1124 tlsPtr_.jpeer = nullptr; 1125 } 1126 tlsPtr_.opeer = nullptr; 1127 1128 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1129 if (initialized) { 1130 delete tlsPtr_.jni_env; 1131 tlsPtr_.jni_env = nullptr; 1132 } 1133 CHECK_NE(GetState(), kRunnable); 1134 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1135 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1136 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1137 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1138 1139 // We may be deleting a still born thread. 1140 SetStateUnsafe(kTerminated); 1141 1142 delete wait_cond_; 1143 delete wait_mutex_; 1144 1145 if (tlsPtr_.long_jump_context != nullptr) { 1146 delete tlsPtr_.long_jump_context; 1147 } 1148 1149 if (initialized) { 1150 CleanupCpu(); 1151 } 1152 1153 delete tlsPtr_.debug_invoke_req; 1154 delete tlsPtr_.single_step_control; 1155 delete tlsPtr_.instrumentation_stack; 1156 delete tlsPtr_.name; 1157 delete tlsPtr_.stack_trace_sample; 1158 1159 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1160 1161 TearDownAlternateSignalStack(); 1162} 1163 1164void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1165 if (!IsExceptionPending()) { 1166 return; 1167 } 1168 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1169 ScopedThreadStateChange tsc(this, kNative); 1170 1171 // Get and clear the exception. 1172 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1173 tlsPtr_.jni_env->ExceptionClear(); 1174 1175 // If the thread has its own handler, use that. 1176 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1177 tlsPtr_.jni_env->GetObjectField(peer.get(), 1178 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1179 if (handler.get() == nullptr) { 1180 // Otherwise use the thread group's default handler. 1181 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1182 WellKnownClasses::java_lang_Thread_group)); 1183 } 1184 1185 // Call the handler. 1186 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1187 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1188 peer.get(), exception.get()); 1189 1190 // If the handler threw, clear that exception too. 1191 tlsPtr_.jni_env->ExceptionClear(); 1192} 1193 1194void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1195 // this.group.removeThread(this); 1196 // group can be null if we're in the compiler or a test. 1197 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1198 ->GetObject(tlsPtr_.opeer); 1199 if (ogroup != nullptr) { 1200 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1201 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1202 ScopedThreadStateChange tsc(soa.Self(), kNative); 1203 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1204 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1205 peer.get()); 1206 } 1207} 1208 1209size_t Thread::NumHandleReferences() { 1210 size_t count = 0; 1211 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1212 count += cur->NumberOfReferences(); 1213 } 1214 return count; 1215} 1216 1217bool Thread::HandleScopeContains(jobject obj) const { 1218 StackReference<mirror::Object>* hs_entry = 1219 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1220 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1221 if (cur->Contains(hs_entry)) { 1222 return true; 1223 } 1224 } 1225 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1226 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1227} 1228 1229void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1230 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1231 size_t num_refs = cur->NumberOfReferences(); 1232 for (size_t j = 0; j < num_refs; ++j) { 1233 mirror::Object* object = cur->GetReference(j); 1234 if (object != nullptr) { 1235 mirror::Object* old_obj = object; 1236 visitor(&object, arg, thread_id, kRootNativeStack); 1237 if (old_obj != object) { 1238 cur->SetReference(j, object); 1239 } 1240 } 1241 } 1242 } 1243} 1244 1245mirror::Object* Thread::DecodeJObject(jobject obj) const { 1246 Locks::mutator_lock_->AssertSharedHeld(this); 1247 if (obj == nullptr) { 1248 return nullptr; 1249 } 1250 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1251 IndirectRefKind kind = GetIndirectRefKind(ref); 1252 mirror::Object* result; 1253 // The "kinds" below are sorted by the frequency we expect to encounter them. 1254 if (kind == kLocal) { 1255 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1256 // Local references do not need a read barrier. 1257 result = locals.Get<kWithoutReadBarrier>(ref); 1258 } else if (kind == kHandleScopeOrInvalid) { 1259 // TODO: make stack indirect reference table lookup more efficient. 1260 // Check if this is a local reference in the handle scope. 1261 if (LIKELY(HandleScopeContains(obj))) { 1262 // Read from handle scope. 1263 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1264 VerifyObject(result); 1265 } else { 1266 result = kInvalidIndirectRefObject; 1267 } 1268 } else if (kind == kGlobal) { 1269 JavaVMExt* const vm = Runtime::Current()->GetJavaVM(); 1270 // Strong global references do not need a read barrier. 1271 result = vm->globals.SynchronizedGet<kWithoutReadBarrier>( 1272 const_cast<Thread*>(this), &vm->globals_lock, ref); 1273 } else { 1274 DCHECK_EQ(kind, kWeakGlobal); 1275 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1276 if (result == kClearedJniWeakGlobal) { 1277 // This is a special case where it's okay to return nullptr. 1278 return nullptr; 1279 } 1280 } 1281 1282 if (UNLIKELY(result == nullptr)) { 1283 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1284 } 1285 return result; 1286} 1287 1288// Implements java.lang.Thread.interrupted. 1289bool Thread::Interrupted() { 1290 MutexLock mu(Thread::Current(), *wait_mutex_); 1291 bool interrupted = IsInterruptedLocked(); 1292 SetInterruptedLocked(false); 1293 return interrupted; 1294} 1295 1296// Implements java.lang.Thread.isInterrupted. 1297bool Thread::IsInterrupted() { 1298 MutexLock mu(Thread::Current(), *wait_mutex_); 1299 return IsInterruptedLocked(); 1300} 1301 1302void Thread::Interrupt(Thread* self) { 1303 MutexLock mu(self, *wait_mutex_); 1304 if (interrupted_) { 1305 return; 1306 } 1307 interrupted_ = true; 1308 NotifyLocked(self); 1309} 1310 1311void Thread::Notify() { 1312 Thread* self = Thread::Current(); 1313 MutexLock mu(self, *wait_mutex_); 1314 NotifyLocked(self); 1315} 1316 1317void Thread::NotifyLocked(Thread* self) { 1318 if (wait_monitor_ != nullptr) { 1319 wait_cond_->Signal(self); 1320 } 1321} 1322 1323class CountStackDepthVisitor : public StackVisitor { 1324 public: 1325 explicit CountStackDepthVisitor(Thread* thread) 1326 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1327 : StackVisitor(thread, nullptr), 1328 depth_(0), skip_depth_(0), skipping_(true) {} 1329 1330 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1331 // We want to skip frames up to and including the exception's constructor. 1332 // Note we also skip the frame if it doesn't have a method (namely the callee 1333 // save frame) 1334 mirror::ArtMethod* m = GetMethod(); 1335 if (skipping_ && !m->IsRuntimeMethod() && 1336 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1337 skipping_ = false; 1338 } 1339 if (!skipping_) { 1340 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1341 ++depth_; 1342 } 1343 } else { 1344 ++skip_depth_; 1345 } 1346 return true; 1347 } 1348 1349 int GetDepth() const { 1350 return depth_; 1351 } 1352 1353 int GetSkipDepth() const { 1354 return skip_depth_; 1355 } 1356 1357 private: 1358 uint32_t depth_; 1359 uint32_t skip_depth_; 1360 bool skipping_; 1361}; 1362 1363template<bool kTransactionActive> 1364class BuildInternalStackTraceVisitor : public StackVisitor { 1365 public: 1366 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1367 : StackVisitor(thread, nullptr), self_(self), 1368 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1369 1370 bool Init(int depth) 1371 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1372 // Allocate method trace with an extra slot that will hold the PC trace 1373 StackHandleScope<1> hs(self_); 1374 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1375 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1376 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1377 if (method_trace.Get() == nullptr) { 1378 return false; 1379 } 1380 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1381 if (dex_pc_trace == nullptr) { 1382 return false; 1383 } 1384 // Save PC trace in last element of method trace, also places it into the 1385 // object graph. 1386 // We are called from native: use non-transactional mode. 1387 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1388 // Set the Object*s and assert that no thread suspension is now possible. 1389 const char* last_no_suspend_cause = 1390 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1391 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1392 method_trace_ = method_trace.Get(); 1393 dex_pc_trace_ = dex_pc_trace; 1394 return true; 1395 } 1396 1397 virtual ~BuildInternalStackTraceVisitor() { 1398 if (method_trace_ != nullptr) { 1399 self_->EndAssertNoThreadSuspension(nullptr); 1400 } 1401 } 1402 1403 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1404 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1405 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1406 } 1407 if (skip_depth_ > 0) { 1408 skip_depth_--; 1409 return true; 1410 } 1411 mirror::ArtMethod* m = GetMethod(); 1412 if (m->IsRuntimeMethod()) { 1413 return true; // Ignore runtime frames (in particular callee save). 1414 } 1415 method_trace_->Set<kTransactionActive>(count_, m); 1416 dex_pc_trace_->Set<kTransactionActive>(count_, 1417 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1418 ++count_; 1419 return true; 1420 } 1421 1422 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1423 return method_trace_; 1424 } 1425 1426 private: 1427 Thread* const self_; 1428 // How many more frames to skip. 1429 int32_t skip_depth_; 1430 // Current position down stack trace. 1431 uint32_t count_; 1432 // Array of dex PC values. 1433 mirror::IntArray* dex_pc_trace_; 1434 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1435 mirror::ObjectArray<mirror::Object>* method_trace_; 1436}; 1437 1438template<bool kTransactionActive> 1439jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1440 // Compute depth of stack 1441 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1442 count_visitor.WalkStack(); 1443 int32_t depth = count_visitor.GetDepth(); 1444 int32_t skip_depth = count_visitor.GetSkipDepth(); 1445 1446 // Build internal stack trace. 1447 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1448 const_cast<Thread*>(this), 1449 skip_depth); 1450 if (!build_trace_visitor.Init(depth)) { 1451 return nullptr; // Allocation failed. 1452 } 1453 build_trace_visitor.WalkStack(); 1454 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1455 if (kIsDebugBuild) { 1456 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1457 CHECK(trace->Get(i) != nullptr); 1458 } 1459 } 1460 return soa.AddLocalReference<jobjectArray>(trace); 1461} 1462template jobject Thread::CreateInternalStackTrace<false>( 1463 const ScopedObjectAccessAlreadyRunnable& soa) const; 1464template jobject Thread::CreateInternalStackTrace<true>( 1465 const ScopedObjectAccessAlreadyRunnable& soa) const; 1466 1467jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1468 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1469 int* stack_depth) { 1470 // Decode the internal stack trace into the depth, method trace and PC trace 1471 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1472 1473 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1474 1475 jobjectArray result; 1476 1477 if (output_array != nullptr) { 1478 // Reuse the array we were given. 1479 result = output_array; 1480 // ...adjusting the number of frames we'll write to not exceed the array length. 1481 const int32_t traces_length = 1482 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1483 depth = std::min(depth, traces_length); 1484 } else { 1485 // Create java_trace array and place in local reference table 1486 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1487 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1488 if (java_traces == nullptr) { 1489 return nullptr; 1490 } 1491 result = soa.AddLocalReference<jobjectArray>(java_traces); 1492 } 1493 1494 if (stack_depth != nullptr) { 1495 *stack_depth = depth; 1496 } 1497 1498 for (int32_t i = 0; i < depth; ++i) { 1499 mirror::ObjectArray<mirror::Object>* method_trace = 1500 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1501 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1502 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1503 MethodHelper mh(method); 1504 int32_t line_number; 1505 StackHandleScope<3> hs(soa.Self()); 1506 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1507 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1508 if (method->IsProxyMethod()) { 1509 line_number = -1; 1510 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1511 // source_name_object intentionally left null for proxy methods 1512 } else { 1513 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1514 uint32_t dex_pc = pc_trace->Get(i); 1515 line_number = mh.GetLineNumFromDexPC(dex_pc); 1516 // Allocate element, potentially triggering GC 1517 // TODO: reuse class_name_object via Class::name_? 1518 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1519 CHECK(descriptor != nullptr); 1520 std::string class_name(PrettyDescriptor(descriptor)); 1521 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1522 if (class_name_object.Get() == nullptr) { 1523 return nullptr; 1524 } 1525 const char* source_file = mh.GetDeclaringClassSourceFile(); 1526 if (source_file != nullptr) { 1527 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1528 if (source_name_object.Get() == nullptr) { 1529 return nullptr; 1530 } 1531 } 1532 } 1533 const char* method_name = mh.GetName(); 1534 CHECK(method_name != nullptr); 1535 Handle<mirror::String> method_name_object( 1536 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1537 if (method_name_object.Get() == nullptr) { 1538 return nullptr; 1539 } 1540 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1541 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1542 if (obj == nullptr) { 1543 return nullptr; 1544 } 1545 // We are called from native: use non-transactional mode. 1546 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1547 } 1548 return result; 1549} 1550 1551void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1552 const char* exception_class_descriptor, const char* fmt, ...) { 1553 va_list args; 1554 va_start(args, fmt); 1555 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1556 fmt, args); 1557 va_end(args); 1558} 1559 1560void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1561 const char* exception_class_descriptor, 1562 const char* fmt, va_list ap) { 1563 std::string msg; 1564 StringAppendV(&msg, fmt, ap); 1565 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1566} 1567 1568void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1569 const char* msg) { 1570 // Callers should either clear or call ThrowNewWrappedException. 1571 AssertNoPendingExceptionForNewException(msg); 1572 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1573} 1574 1575void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1576 const char* exception_class_descriptor, 1577 const char* msg) { 1578 DCHECK_EQ(this, Thread::Current()); 1579 ScopedObjectAccessUnchecked soa(this); 1580 StackHandleScope<5> hs(soa.Self()); 1581 // Ensure we don't forget arguments over object allocation. 1582 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1583 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1584 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1585 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1586 ClearException(); 1587 Runtime* runtime = Runtime::Current(); 1588 1589 mirror::ClassLoader* cl = nullptr; 1590 if (saved_throw_method.Get() != nullptr) { 1591 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1592 } 1593 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1594 Handle<mirror::Class> exception_class( 1595 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1596 class_loader))); 1597 if (UNLIKELY(exception_class.Get() == nullptr)) { 1598 CHECK(IsExceptionPending()); 1599 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1600 return; 1601 } 1602 1603 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1604 DCHECK(IsExceptionPending()); 1605 return; 1606 } 1607 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1608 Handle<mirror::Throwable> exception( 1609 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1610 1611 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1612 if (exception.Get() == nullptr) { 1613 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1614 throw_location.GetDexPc()); 1615 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1616 return; 1617 } 1618 1619 // Choose an appropriate constructor and set up the arguments. 1620 const char* signature; 1621 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1622 if (msg != nullptr) { 1623 // Ensure we remember this and the method over the String allocation. 1624 msg_string.reset( 1625 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1626 if (UNLIKELY(msg_string.get() == nullptr)) { 1627 CHECK(IsExceptionPending()); // OOME. 1628 return; 1629 } 1630 if (cause.get() == nullptr) { 1631 signature = "(Ljava/lang/String;)V"; 1632 } else { 1633 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1634 } 1635 } else { 1636 if (cause.get() == nullptr) { 1637 signature = "()V"; 1638 } else { 1639 signature = "(Ljava/lang/Throwable;)V"; 1640 } 1641 } 1642 mirror::ArtMethod* exception_init_method = 1643 exception_class->FindDeclaredDirectMethod("<init>", signature); 1644 1645 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1646 << PrettyDescriptor(exception_class_descriptor); 1647 1648 if (UNLIKELY(!runtime->IsStarted())) { 1649 // Something is trying to throw an exception without a started runtime, which is the common 1650 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1651 // the exception fields directly. 1652 if (msg != nullptr) { 1653 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1654 } 1655 if (cause.get() != nullptr) { 1656 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1657 } 1658 ScopedLocalRef<jobject> trace(GetJniEnv(), 1659 Runtime::Current()->IsActiveTransaction() 1660 ? CreateInternalStackTrace<true>(soa) 1661 : CreateInternalStackTrace<false>(soa)); 1662 if (trace.get() != nullptr) { 1663 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1664 } 1665 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1666 throw_location.GetDexPc()); 1667 SetException(gc_safe_throw_location, exception.Get()); 1668 } else { 1669 jvalue jv_args[2]; 1670 size_t i = 0; 1671 1672 if (msg != nullptr) { 1673 jv_args[i].l = msg_string.get(); 1674 ++i; 1675 } 1676 if (cause.get() != nullptr) { 1677 jv_args[i].l = cause.get(); 1678 ++i; 1679 } 1680 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1681 if (LIKELY(!IsExceptionPending())) { 1682 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1683 throw_location.GetDexPc()); 1684 SetException(gc_safe_throw_location, exception.Get()); 1685 } 1686 } 1687} 1688 1689void Thread::ThrowOutOfMemoryError(const char* msg) { 1690 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1691 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1692 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1693 if (!tls32_.throwing_OutOfMemoryError) { 1694 tls32_.throwing_OutOfMemoryError = true; 1695 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1696 tls32_.throwing_OutOfMemoryError = false; 1697 } else { 1698 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1699 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1700 } 1701} 1702 1703Thread* Thread::CurrentFromGdb() { 1704 return Thread::Current(); 1705} 1706 1707void Thread::DumpFromGdb() const { 1708 std::ostringstream ss; 1709 Dump(ss); 1710 std::string str(ss.str()); 1711 // log to stderr for debugging command line processes 1712 std::cerr << str; 1713#ifdef HAVE_ANDROID_OS 1714 // log to logcat for debugging frameworks processes 1715 LOG(INFO) << str; 1716#endif 1717} 1718 1719// Explicitly instantiate 32 and 64bit thread offset dumping support. 1720template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1721template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1722 1723template<size_t ptr_size> 1724void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1725#define DO_THREAD_OFFSET(x, y) \ 1726 if (offset == x.Uint32Value()) { \ 1727 os << y; \ 1728 return; \ 1729 } 1730 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1731 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1732 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1733 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1734 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1735 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1736 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1737 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1738 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1739 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1740 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1741 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1742 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1743#undef DO_THREAD_OFFSET 1744 1745#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1746 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1747 os << #x; \ 1748 return; \ 1749 } 1750 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1751 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1752#undef INTERPRETER_ENTRY_POINT_INFO 1753 1754#define JNI_ENTRY_POINT_INFO(x) \ 1755 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1756 os << #x; \ 1757 return; \ 1758 } 1759 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1760#undef JNI_ENTRY_POINT_INFO 1761 1762#define PORTABLE_ENTRY_POINT_INFO(x) \ 1763 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1764 os << #x; \ 1765 return; \ 1766 } 1767 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1768 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1769 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1770#undef PORTABLE_ENTRY_POINT_INFO 1771 1772#define QUICK_ENTRY_POINT_INFO(x) \ 1773 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1774 os << #x; \ 1775 return; \ 1776 } 1777 QUICK_ENTRY_POINT_INFO(pAllocArray) 1778 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1779 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1780 QUICK_ENTRY_POINT_INFO(pAllocObject) 1781 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1782 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1783 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1784 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1785 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1786 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1787 QUICK_ENTRY_POINT_INFO(pCheckCast) 1788 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1789 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1790 QUICK_ENTRY_POINT_INFO(pInitializeType) 1791 QUICK_ENTRY_POINT_INFO(pResolveString) 1792 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1793 QUICK_ENTRY_POINT_INFO(pSet32Static) 1794 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1795 QUICK_ENTRY_POINT_INFO(pSet64Static) 1796 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1797 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1798 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1799 QUICK_ENTRY_POINT_INFO(pGet32Static) 1800 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1801 QUICK_ENTRY_POINT_INFO(pGet64Static) 1802 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1803 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1804 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1805 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1806 QUICK_ENTRY_POINT_INFO(pAputObject) 1807 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1808 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1809 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1810 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1811 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1812 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1813 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1814 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1815 QUICK_ENTRY_POINT_INFO(pLockObject) 1816 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1817 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1818 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1819 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1820 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1821 QUICK_ENTRY_POINT_INFO(pFmod) 1822 QUICK_ENTRY_POINT_INFO(pL2d) 1823 QUICK_ENTRY_POINT_INFO(pFmodf) 1824 QUICK_ENTRY_POINT_INFO(pL2f) 1825 QUICK_ENTRY_POINT_INFO(pD2iz) 1826 QUICK_ENTRY_POINT_INFO(pF2iz) 1827 QUICK_ENTRY_POINT_INFO(pIdivmod) 1828 QUICK_ENTRY_POINT_INFO(pD2l) 1829 QUICK_ENTRY_POINT_INFO(pF2l) 1830 QUICK_ENTRY_POINT_INFO(pLdiv) 1831 QUICK_ENTRY_POINT_INFO(pLmod) 1832 QUICK_ENTRY_POINT_INFO(pLmul) 1833 QUICK_ENTRY_POINT_INFO(pShlLong) 1834 QUICK_ENTRY_POINT_INFO(pShrLong) 1835 QUICK_ENTRY_POINT_INFO(pUshrLong) 1836 QUICK_ENTRY_POINT_INFO(pIndexOf) 1837 QUICK_ENTRY_POINT_INFO(pMemcmp16) 1838 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1839 QUICK_ENTRY_POINT_INFO(pMemcpy) 1840 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1841 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1842 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1843 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1844 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1845 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1846 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1847 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1848 QUICK_ENTRY_POINT_INFO(pCheckSuspend) 1849 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1850 QUICK_ENTRY_POINT_INFO(pDeliverException) 1851 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1852 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1853 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1854 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1855 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1856#undef QUICK_ENTRY_POINT_INFO 1857 1858 os << offset; 1859} 1860 1861void Thread::QuickDeliverException() { 1862 // Get exception from thread. 1863 ThrowLocation throw_location; 1864 mirror::Throwable* exception = GetException(&throw_location); 1865 CHECK(exception != nullptr); 1866 // Don't leave exception visible while we try to find the handler, which may cause class 1867 // resolution. 1868 ClearException(); 1869 bool is_deoptimization = (exception == GetDeoptimizationException()); 1870 QuickExceptionHandler exception_handler(this, is_deoptimization); 1871 if (is_deoptimization) { 1872 exception_handler.DeoptimizeStack(); 1873 } else { 1874 exception_handler.FindCatch(throw_location, exception); 1875 } 1876 exception_handler.UpdateInstrumentationStack(); 1877 exception_handler.DoLongJump(); 1878 LOG(FATAL) << "UNREACHABLE"; 1879} 1880 1881Context* Thread::GetLongJumpContext() { 1882 Context* result = tlsPtr_.long_jump_context; 1883 if (result == nullptr) { 1884 result = Context::Create(); 1885 } else { 1886 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1887 result->Reset(); 1888 } 1889 return result; 1890} 1891 1892struct CurrentMethodVisitor FINAL : public StackVisitor { 1893 CurrentMethodVisitor(Thread* thread, Context* context) 1894 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1895 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1896 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1897 mirror::ArtMethod* m = GetMethod(); 1898 if (m->IsRuntimeMethod()) { 1899 // Continue if this is a runtime method. 1900 return true; 1901 } 1902 if (context_ != nullptr) { 1903 this_object_ = GetThisObject(); 1904 } 1905 method_ = m; 1906 dex_pc_ = GetDexPc(); 1907 return false; 1908 } 1909 mirror::Object* this_object_; 1910 mirror::ArtMethod* method_; 1911 uint32_t dex_pc_; 1912}; 1913 1914mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1915 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1916 visitor.WalkStack(false); 1917 if (dex_pc != nullptr) { 1918 *dex_pc = visitor.dex_pc_; 1919 } 1920 return visitor.method_; 1921} 1922 1923ThrowLocation Thread::GetCurrentLocationForThrow() { 1924 Context* context = GetLongJumpContext(); 1925 CurrentMethodVisitor visitor(this, context); 1926 visitor.WalkStack(false); 1927 ReleaseLongJumpContext(context); 1928 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1929} 1930 1931bool Thread::HoldsLock(mirror::Object* object) const { 1932 if (object == nullptr) { 1933 return false; 1934 } 1935 return object->GetLockOwnerThreadId() == GetThreadId(); 1936} 1937 1938// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1939template <typename RootVisitor> 1940class ReferenceMapVisitor : public StackVisitor { 1941 public: 1942 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1943 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1944 : StackVisitor(thread, context), visitor_(visitor) {} 1945 1946 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1947 if (false) { 1948 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1949 << StringPrintf("@ PC:%04x", GetDexPc()); 1950 } 1951 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1952 if (shadow_frame != nullptr) { 1953 VisitShadowFrame(shadow_frame); 1954 } else { 1955 VisitQuickFrame(); 1956 } 1957 return true; 1958 } 1959 1960 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1961 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 1962 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 1963 mirror::ArtMethod* m = *method_addr; 1964 DCHECK(m != nullptr); 1965 size_t num_regs = shadow_frame->NumberOfVRegs(); 1966 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1967 // handle scope for JNI or References for interpreter. 1968 for (size_t reg = 0; reg < num_regs; ++reg) { 1969 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1970 if (ref != nullptr) { 1971 mirror::Object* new_ref = ref; 1972 visitor_(&new_ref, reg, this); 1973 if (new_ref != ref) { 1974 shadow_frame->SetVRegReference(reg, new_ref); 1975 } 1976 } 1977 } 1978 } else { 1979 // Java method. 1980 // Portable path use DexGcMap and store in Method.native_gc_map_. 1981 const uint8_t* gc_map = m->GetNativeGcMap(); 1982 CHECK(gc_map != nullptr) << PrettyMethod(m); 1983 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 1984 uint32_t dex_pc = shadow_frame->GetDexPC(); 1985 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 1986 DCHECK(reg_bitmap != nullptr); 1987 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 1988 for (size_t reg = 0; reg < num_regs; ++reg) { 1989 if (TestBitmap(reg, reg_bitmap)) { 1990 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1991 if (ref != nullptr) { 1992 mirror::Object* new_ref = ref; 1993 visitor_(&new_ref, reg, this); 1994 if (new_ref != ref) { 1995 shadow_frame->SetVRegReference(reg, new_ref); 1996 } 1997 } 1998 } 1999 } 2000 } 2001 } 2002 2003 private: 2004 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2005 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2006 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2007 mirror::ArtMethod* old_method = m; 2008 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2009 if (m != old_method) { 2010 cur_quick_frame->Assign(m); 2011 } 2012 2013 // Process register map (which native and runtime methods don't have) 2014 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2015 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2016 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2017 mh_.ChangeMethod(m); 2018 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 2019 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2020 NativePcOffsetToReferenceMap map(native_gc_map); 2021 size_t num_regs = std::min(map.RegWidth() * 8, 2022 static_cast<size_t>(code_item->registers_size_)); 2023 if (num_regs > 0) { 2024 Runtime* runtime = Runtime::Current(); 2025 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2026 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2027 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2028 DCHECK(reg_bitmap != nullptr); 2029 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2030 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2031 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2032 // For all dex registers in the bitmap 2033 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2034 DCHECK(cur_quick_frame != nullptr); 2035 for (size_t reg = 0; reg < num_regs; ++reg) { 2036 // Does this register hold a reference? 2037 if (TestBitmap(reg, reg_bitmap)) { 2038 uint32_t vmap_offset; 2039 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2040 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2041 kReferenceVReg); 2042 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2043 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2044 if (*ref_addr != nullptr) { 2045 visitor_(ref_addr, reg, this); 2046 } 2047 } else { 2048 StackReference<mirror::Object>* ref_addr = 2049 reinterpret_cast<StackReference<mirror::Object>*>( 2050 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2051 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2052 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2053 if (ref != nullptr) { 2054 mirror::Object* new_ref = ref; 2055 visitor_(&new_ref, reg, this); 2056 if (ref != new_ref) { 2057 ref_addr->Assign(new_ref); 2058 } 2059 } 2060 } 2061 } 2062 } 2063 } 2064 } 2065 } 2066 2067 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2068 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2069 } 2070 2071 // Visitor for when we visit a root. 2072 const RootVisitor& visitor_; 2073 2074 // A method helper we keep around to avoid dex file/cache re-computations. 2075 MethodHelper mh_; 2076}; 2077 2078class RootCallbackVisitor { 2079 public: 2080 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2081 : callback_(callback), arg_(arg), tid_(tid) {} 2082 2083 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2084 callback_(obj, arg_, tid_, kRootJavaFrame); 2085 } 2086 2087 private: 2088 RootCallback* const callback_; 2089 void* const arg_; 2090 const uint32_t tid_; 2091}; 2092 2093void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2094 VerifyObject(class_loader_override); 2095 tlsPtr_.class_loader_override = class_loader_override; 2096} 2097 2098void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2099 uint32_t thread_id = GetThreadId(); 2100 if (tlsPtr_.opeer != nullptr) { 2101 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2102 } 2103 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2104 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2105 } 2106 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2107 if (tlsPtr_.class_loader_override != nullptr) { 2108 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, thread_id, 2109 kRootNativeStack); 2110 } 2111 if (tlsPtr_.monitor_enter_object != nullptr) { 2112 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2113 } 2114 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2115 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2116 HandleScopeVisitRoots(visitor, arg, thread_id); 2117 if (tlsPtr_.debug_invoke_req != nullptr) { 2118 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2119 } 2120 if (tlsPtr_.single_step_control != nullptr) { 2121 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2122 } 2123 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2124 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2125 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2126 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2127 shadow_frame = shadow_frame->GetLink()) { 2128 mapper.VisitShadowFrame(shadow_frame); 2129 } 2130 } 2131 // Visit roots on this thread's stack 2132 Context* context = GetLongJumpContext(); 2133 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2134 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2135 mapper.WalkStack(); 2136 ReleaseLongJumpContext(context); 2137 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2138 if (frame.this_object_ != nullptr) { 2139 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2140 } 2141 DCHECK(frame.method_ != nullptr); 2142 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2143 } 2144} 2145 2146static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2147 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2148 VerifyObject(*root); 2149} 2150 2151void Thread::VerifyStackImpl() { 2152 std::unique_ptr<Context> context(Context::Create()); 2153 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2154 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2155 mapper.WalkStack(); 2156} 2157 2158// Set the stack end to that to be used during a stack overflow 2159void Thread::SetStackEndForStackOverflow() { 2160 // During stack overflow we allow use of the full stack. 2161 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2162 // However, we seem to have already extended to use the full stack. 2163 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2164 << kStackOverflowReservedBytes << ")?"; 2165 DumpStack(LOG(ERROR)); 2166 LOG(FATAL) << "Recursive stack overflow."; 2167 } 2168 2169 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2170} 2171 2172void Thread::SetTlab(byte* start, byte* end) { 2173 DCHECK_LE(start, end); 2174 tlsPtr_.thread_local_start = start; 2175 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2176 tlsPtr_.thread_local_end = end; 2177 tlsPtr_.thread_local_objects = 0; 2178} 2179 2180bool Thread::HasTlab() const { 2181 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2182 if (has_tlab) { 2183 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2184 } else { 2185 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2186 } 2187 return has_tlab; 2188} 2189 2190std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2191 thread.ShortDump(os); 2192 return os; 2193} 2194 2195} // namespace art 2196