thread.cc revision 41f9cc28f2c9edd3903ba6ca1c75b022445552ad
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#include <sstream> 33 34#include "arch/context.h" 35#include "art_field-inl.h" 36#include "art_method-inl.h" 37#include "base/bit_utils.h" 38#include "base/mutex.h" 39#include "base/timing_logger.h" 40#include "base/to_str.h" 41#include "class_linker-inl.h" 42#include "debugger.h" 43#include "dex_file-inl.h" 44#include "entrypoints/entrypoint_utils.h" 45#include "entrypoints/quick/quick_alloc_entrypoints.h" 46#include "gc_map.h" 47#include "gc/accounting/card_table-inl.h" 48#include "gc/allocator/rosalloc.h" 49#include "gc/heap.h" 50#include "gc/space/space.h" 51#include "handle_scope-inl.h" 52#include "indirect_reference_table-inl.h" 53#include "jni_internal.h" 54#include "mirror/class_loader.h" 55#include "mirror/class-inl.h" 56#include "mirror/object_array-inl.h" 57#include "mirror/stack_trace_element.h" 58#include "monitor.h" 59#include "object_lock.h" 60#include "quick_exception_handler.h" 61#include "quick/quick_method_frame_info.h" 62#include "reflection.h" 63#include "runtime.h" 64#include "scoped_thread_state_change.h" 65#include "ScopedLocalRef.h" 66#include "ScopedUtfChars.h" 67#include "stack.h" 68#include "thread_list.h" 69#include "thread-inl.h" 70#include "utils.h" 71#include "verifier/dex_gc_map.h" 72#include "verifier/method_verifier.h" 73#include "verify_object-inl.h" 74#include "vmap_table.h" 75#include "well_known_classes.h" 76 77namespace art { 78 79bool Thread::is_started_ = false; 80pthread_key_t Thread::pthread_key_self_; 81ConditionVariable* Thread::resume_cond_ = nullptr; 82const size_t Thread::kStackOverflowImplicitCheckSize = GetStackOverflowReservedBytes(kRuntimeISA); 83 84static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 85 86void Thread::InitCardTable() { 87 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 88} 89 90static void UnimplementedEntryPoint() { 91 UNIMPLEMENTED(FATAL); 92} 93 94void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 95 QuickEntryPoints* qpoints); 96 97void Thread::InitTlsEntryPoints() { 98 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 99 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 100 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(&tlsPtr_.quick_entrypoints) + 101 sizeof(tlsPtr_.quick_entrypoints)); 102 for (uintptr_t* it = begin; it != end; ++it) { 103 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 104 } 105 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 106 &tlsPtr_.quick_entrypoints); 107} 108 109void Thread::InitStringEntryPoints() { 110 ScopedObjectAccess soa(this); 111 QuickEntryPoints* qpoints = &tlsPtr_.quick_entrypoints; 112 qpoints->pNewEmptyString = reinterpret_cast<void(*)()>( 113 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newEmptyString)); 114 qpoints->pNewStringFromBytes_B = reinterpret_cast<void(*)()>( 115 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_B)); 116 qpoints->pNewStringFromBytes_BI = reinterpret_cast<void(*)()>( 117 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BI)); 118 qpoints->pNewStringFromBytes_BII = reinterpret_cast<void(*)()>( 119 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BII)); 120 qpoints->pNewStringFromBytes_BIII = reinterpret_cast<void(*)()>( 121 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BIII)); 122 qpoints->pNewStringFromBytes_BIIString = reinterpret_cast<void(*)()>( 123 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BIIString)); 124 qpoints->pNewStringFromBytes_BString = reinterpret_cast<void(*)()>( 125 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BString)); 126 qpoints->pNewStringFromBytes_BIICharset = reinterpret_cast<void(*)()>( 127 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BIICharset)); 128 qpoints->pNewStringFromBytes_BCharset = reinterpret_cast<void(*)()>( 129 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BCharset)); 130 qpoints->pNewStringFromChars_C = reinterpret_cast<void(*)()>( 131 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromChars_C)); 132 qpoints->pNewStringFromChars_CII = reinterpret_cast<void(*)()>( 133 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromChars_CII)); 134 qpoints->pNewStringFromChars_IIC = reinterpret_cast<void(*)()>( 135 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromChars_IIC)); 136 qpoints->pNewStringFromCodePoints = reinterpret_cast<void(*)()>( 137 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromCodePoints)); 138 qpoints->pNewStringFromString = reinterpret_cast<void(*)()>( 139 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromString)); 140 qpoints->pNewStringFromStringBuffer = reinterpret_cast<void(*)()>( 141 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromStringBuffer)); 142 qpoints->pNewStringFromStringBuilder = reinterpret_cast<void(*)()>( 143 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromStringBuilder)); 144} 145 146void Thread::ResetQuickAllocEntryPointsForThread() { 147 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 148} 149 150class DeoptimizationReturnValueRecord { 151 public: 152 DeoptimizationReturnValueRecord(const JValue& ret_val, 153 bool is_reference, 154 DeoptimizationReturnValueRecord* link) 155 : ret_val_(ret_val), is_reference_(is_reference), link_(link) {} 156 157 JValue GetReturnValue() const { return ret_val_; } 158 bool IsReference() const { return is_reference_; } 159 DeoptimizationReturnValueRecord* GetLink() const { return link_; } 160 mirror::Object** GetGCRoot() { 161 DCHECK(is_reference_); 162 return ret_val_.GetGCRoot(); 163 } 164 165 private: 166 JValue ret_val_; 167 const bool is_reference_; 168 DeoptimizationReturnValueRecord* const link_; 169 170 DISALLOW_COPY_AND_ASSIGN(DeoptimizationReturnValueRecord); 171}; 172 173class StackedShadowFrameRecord { 174 public: 175 StackedShadowFrameRecord(ShadowFrame* shadow_frame, 176 StackedShadowFrameType type, 177 StackedShadowFrameRecord* link) 178 : shadow_frame_(shadow_frame), 179 type_(type), 180 link_(link) {} 181 182 ShadowFrame* GetShadowFrame() const { return shadow_frame_; } 183 StackedShadowFrameType GetType() const { return type_; } 184 StackedShadowFrameRecord* GetLink() const { return link_; } 185 186 private: 187 ShadowFrame* const shadow_frame_; 188 const StackedShadowFrameType type_; 189 StackedShadowFrameRecord* const link_; 190 191 DISALLOW_COPY_AND_ASSIGN(StackedShadowFrameRecord); 192}; 193 194void Thread::PushAndClearDeoptimizationReturnValue() { 195 DeoptimizationReturnValueRecord* record = new DeoptimizationReturnValueRecord( 196 tls64_.deoptimization_return_value, 197 tls32_.deoptimization_return_value_is_reference, 198 tlsPtr_.deoptimization_return_value_stack); 199 tlsPtr_.deoptimization_return_value_stack = record; 200 ClearDeoptimizationReturnValue(); 201} 202 203JValue Thread::PopDeoptimizationReturnValue() { 204 DeoptimizationReturnValueRecord* record = tlsPtr_.deoptimization_return_value_stack; 205 DCHECK(record != nullptr); 206 tlsPtr_.deoptimization_return_value_stack = record->GetLink(); 207 JValue ret_val(record->GetReturnValue()); 208 delete record; 209 return ret_val; 210} 211 212void Thread::PushStackedShadowFrame(ShadowFrame* sf, StackedShadowFrameType type) { 213 StackedShadowFrameRecord* record = new StackedShadowFrameRecord( 214 sf, type, tlsPtr_.stacked_shadow_frame_record); 215 tlsPtr_.stacked_shadow_frame_record = record; 216} 217 218ShadowFrame* Thread::PopStackedShadowFrame(StackedShadowFrameType type) { 219 StackedShadowFrameRecord* record = tlsPtr_.stacked_shadow_frame_record; 220 DCHECK(record != nullptr); 221 DCHECK_EQ(record->GetType(), type); 222 tlsPtr_.stacked_shadow_frame_record = record->GetLink(); 223 ShadowFrame* shadow_frame = record->GetShadowFrame(); 224 delete record; 225 return shadow_frame; 226} 227 228void Thread::InitTid() { 229 tls32_.tid = ::art::GetTid(); 230} 231 232void Thread::InitAfterFork() { 233 // One thread (us) survived the fork, but we have a new tid so we need to 234 // update the value stashed in this Thread*. 235 InitTid(); 236} 237 238void* Thread::CreateCallback(void* arg) { 239 Thread* self = reinterpret_cast<Thread*>(arg); 240 Runtime* runtime = Runtime::Current(); 241 if (runtime == nullptr) { 242 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 243 return nullptr; 244 } 245 { 246 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 247 // after self->Init(). 248 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 249 // Check that if we got here we cannot be shutting down (as shutdown should never have started 250 // while threads are being born). 251 CHECK(!runtime->IsShuttingDownLocked()); 252 // Note: given that the JNIEnv is created in the parent thread, the only failure point here is 253 // a mess in InitStackHwm. We do not have a reasonable way to recover from that, so abort 254 // the runtime in such a case. In case this ever changes, we need to make sure here to 255 // delete the tmp_jni_env, as we own it at this point. 256 CHECK(self->Init(runtime->GetThreadList(), runtime->GetJavaVM(), self->tlsPtr_.tmp_jni_env)); 257 self->tlsPtr_.tmp_jni_env = nullptr; 258 Runtime::Current()->EndThreadBirth(); 259 } 260 { 261 ScopedObjectAccess soa(self); 262 self->InitStringEntryPoints(); 263 264 // Copy peer into self, deleting global reference when done. 265 CHECK(self->tlsPtr_.jpeer != nullptr); 266 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 267 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 268 self->tlsPtr_.jpeer = nullptr; 269 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 270 271 ArtField* priorityField = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority); 272 self->SetNativePriority(priorityField->GetInt(self->tlsPtr_.opeer)); 273 Dbg::PostThreadStart(self); 274 275 // Invoke the 'run' method of our java.lang.Thread. 276 mirror::Object* receiver = self->tlsPtr_.opeer; 277 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 278 ScopedLocalRef<jobject> ref(soa.Env(), soa.AddLocalReference<jobject>(receiver)); 279 InvokeVirtualOrInterfaceWithJValues(soa, ref.get(), mid, nullptr); 280 } 281 // Detach and delete self. 282 Runtime::Current()->GetThreadList()->Unregister(self); 283 284 return nullptr; 285} 286 287Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 288 mirror::Object* thread_peer) { 289 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 290 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 291 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 292 // to stop it from going away. 293 if (kIsDebugBuild) { 294 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 295 if (result != nullptr && !result->IsSuspended()) { 296 Locks::thread_list_lock_->AssertHeld(soa.Self()); 297 } 298 } 299 return result; 300} 301 302Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 303 jobject java_thread) { 304 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 305} 306 307static size_t FixStackSize(size_t stack_size) { 308 // A stack size of zero means "use the default". 309 if (stack_size == 0) { 310 stack_size = Runtime::Current()->GetDefaultStackSize(); 311 } 312 313 // Dalvik used the bionic pthread default stack size for native threads, 314 // so include that here to support apps that expect large native stacks. 315 stack_size += 1 * MB; 316 317 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 318 if (stack_size < PTHREAD_STACK_MIN) { 319 stack_size = PTHREAD_STACK_MIN; 320 } 321 322 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 323 // It's likely that callers are trying to ensure they have at least a certain amount of 324 // stack space, so we should add our reserved space on top of what they requested, rather 325 // than implicitly take it away from them. 326 stack_size += GetStackOverflowReservedBytes(kRuntimeISA); 327 } else { 328 // If we are going to use implicit stack checks, allocate space for the protected 329 // region at the bottom of the stack. 330 stack_size += Thread::kStackOverflowImplicitCheckSize + 331 GetStackOverflowReservedBytes(kRuntimeISA); 332 } 333 334 // Some systems require the stack size to be a multiple of the system page size, so round up. 335 stack_size = RoundUp(stack_size, kPageSize); 336 337 return stack_size; 338} 339 340// Global variable to prevent the compiler optimizing away the page reads for the stack. 341uint8_t dont_optimize_this; 342 343// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 344// overflow is detected. It is located right below the stack_begin_. 345// 346// There is a little complexity here that deserves a special mention. On some 347// architectures, the stack created using a VM_GROWSDOWN flag 348// to prevent memory being allocated when it's not needed. This flag makes the 349// kernel only allocate memory for the stack by growing down in memory. Because we 350// want to put an mprotected region far away from that at the stack top, we need 351// to make sure the pages for the stack are mapped in before we call mprotect. We do 352// this by reading every page from the stack bottom (highest address) to the stack top. 353// We then madvise this away. 354void Thread::InstallImplicitProtection() { 355 uint8_t* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 356 uint8_t* stack_himem = tlsPtr_.stack_end; 357 uint8_t* stack_top = reinterpret_cast<uint8_t*>(reinterpret_cast<uintptr_t>(&stack_himem) & 358 ~(kPageSize - 1)); // Page containing current top of stack. 359 360 // First remove the protection on the protected region as will want to read and 361 // write it. This may fail (on the first attempt when the stack is not mapped) 362 // but we ignore that. 363 UnprotectStack(); 364 365 // Map in the stack. This must be done by reading from the 366 // current stack pointer downwards as the stack may be mapped using VM_GROWSDOWN 367 // in the kernel. Any access more than a page below the current SP might cause 368 // a segv. 369 370 // Read every page from the high address to the low. 371 for (uint8_t* p = stack_top; p >= pregion; p -= kPageSize) { 372 dont_optimize_this = *p; 373 } 374 375 VLOG(threads) << "installing stack protected region at " << std::hex << 376 static_cast<void*>(pregion) << " to " << 377 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 378 379 // Protect the bottom of the stack to prevent read/write to it. 380 ProtectStack(); 381 382 // Tell the kernel that we won't be needing these pages any more. 383 // NB. madvise will probably write zeroes into the memory (on linux it does). 384 uint32_t unwanted_size = stack_top - pregion - kPageSize; 385 madvise(pregion, unwanted_size, MADV_DONTNEED); 386} 387 388void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 389 CHECK(java_peer != nullptr); 390 Thread* self = static_cast<JNIEnvExt*>(env)->self; 391 Runtime* runtime = Runtime::Current(); 392 393 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 394 bool thread_start_during_shutdown = false; 395 { 396 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 397 if (runtime->IsShuttingDownLocked()) { 398 thread_start_during_shutdown = true; 399 } else { 400 runtime->StartThreadBirth(); 401 } 402 } 403 if (thread_start_during_shutdown) { 404 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 405 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 406 return; 407 } 408 409 Thread* child_thread = new Thread(is_daemon); 410 // Use global JNI ref to hold peer live while child thread starts. 411 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 412 stack_size = FixStackSize(stack_size); 413 414 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 415 // assign it. 416 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 417 reinterpret_cast<jlong>(child_thread)); 418 419 // Try to allocate a JNIEnvExt for the thread. We do this here as we might be out of memory and 420 // do not have a good way to report this on the child's side. 421 std::unique_ptr<JNIEnvExt> child_jni_env_ext( 422 JNIEnvExt::Create(child_thread, Runtime::Current()->GetJavaVM())); 423 424 int pthread_create_result = 0; 425 if (child_jni_env_ext.get() != nullptr) { 426 pthread_t new_pthread; 427 pthread_attr_t attr; 428 child_thread->tlsPtr_.tmp_jni_env = child_jni_env_ext.get(); 429 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 430 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), 431 "PTHREAD_CREATE_DETACHED"); 432 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 433 pthread_create_result = pthread_create(&new_pthread, 434 &attr, 435 Thread::CreateCallback, 436 child_thread); 437 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 438 439 if (pthread_create_result == 0) { 440 // pthread_create started the new thread. The child is now responsible for managing the 441 // JNIEnvExt we created. 442 // Note: we can't check for tmp_jni_env == nullptr, as that would require synchronization 443 // between the threads. 444 child_jni_env_ext.release(); 445 return; 446 } 447 } 448 449 // Either JNIEnvExt::Create or pthread_create(3) failed, so clean up. 450 { 451 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 452 runtime->EndThreadBirth(); 453 } 454 // Manually delete the global reference since Thread::Init will not have been run. 455 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 456 child_thread->tlsPtr_.jpeer = nullptr; 457 delete child_thread; 458 child_thread = nullptr; 459 // TODO: remove from thread group? 460 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 461 { 462 std::string msg(child_jni_env_ext.get() == nullptr ? 463 "Could not allocate JNI Env" : 464 StringPrintf("pthread_create (%s stack) failed: %s", 465 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 466 ScopedObjectAccess soa(env); 467 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 468 } 469} 470 471bool Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm, JNIEnvExt* jni_env_ext) { 472 // This function does all the initialization that must be run by the native thread it applies to. 473 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 474 // we can handshake with the corresponding native thread when it's ready.) Check this native 475 // thread hasn't been through here already... 476 CHECK(Thread::Current() == nullptr); 477 478 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 479 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 480 tlsPtr_.pthread_self = pthread_self(); 481 CHECK(is_started_); 482 483 SetUpAlternateSignalStack(); 484 if (!InitStackHwm()) { 485 return false; 486 } 487 InitCpu(); 488 InitTlsEntryPoints(); 489 RemoveSuspendTrigger(); 490 InitCardTable(); 491 InitTid(); 492 493 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 494 DCHECK_EQ(Thread::Current(), this); 495 496 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 497 498 if (jni_env_ext != nullptr) { 499 DCHECK_EQ(jni_env_ext->vm, java_vm); 500 DCHECK_EQ(jni_env_ext->self, this); 501 tlsPtr_.jni_env = jni_env_ext; 502 } else { 503 tlsPtr_.jni_env = JNIEnvExt::Create(this, java_vm); 504 if (tlsPtr_.jni_env == nullptr) { 505 return false; 506 } 507 } 508 509 thread_list->Register(this); 510 return true; 511} 512 513Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 514 bool create_peer) { 515 Runtime* runtime = Runtime::Current(); 516 if (runtime == nullptr) { 517 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 518 return nullptr; 519 } 520 Thread* self; 521 { 522 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 523 if (runtime->IsShuttingDownLocked()) { 524 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 525 return nullptr; 526 } else { 527 Runtime::Current()->StartThreadBirth(); 528 self = new Thread(as_daemon); 529 bool init_success = self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 530 Runtime::Current()->EndThreadBirth(); 531 if (!init_success) { 532 delete self; 533 return nullptr; 534 } 535 } 536 } 537 538 self->InitStringEntryPoints(); 539 540 CHECK_NE(self->GetState(), kRunnable); 541 self->SetState(kNative); 542 543 // If we're the main thread, ClassLinker won't be created until after we're attached, 544 // so that thread needs a two-stage attach. Regular threads don't need this hack. 545 // In the compiler, all threads need this hack, because no-one's going to be getting 546 // a native peer! 547 if (create_peer) { 548 self->CreatePeer(thread_name, as_daemon, thread_group); 549 } else { 550 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 551 if (thread_name != nullptr) { 552 self->tlsPtr_.name->assign(thread_name); 553 ::art::SetThreadName(thread_name); 554 } else if (self->GetJniEnv()->check_jni) { 555 LOG(WARNING) << *Thread::Current() << " attached without supplying a name"; 556 } 557 } 558 559 { 560 ScopedObjectAccess soa(self); 561 Dbg::PostThreadStart(self); 562 } 563 564 return self; 565} 566 567void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 568 Runtime* runtime = Runtime::Current(); 569 CHECK(runtime->IsStarted()); 570 JNIEnv* env = tlsPtr_.jni_env; 571 572 if (thread_group == nullptr) { 573 thread_group = runtime->GetMainThreadGroup(); 574 } 575 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 576 // Add missing null check in case of OOM b/18297817 577 if (name != nullptr && thread_name.get() == nullptr) { 578 CHECK(IsExceptionPending()); 579 return; 580 } 581 jint thread_priority = GetNativePriority(); 582 jboolean thread_is_daemon = as_daemon; 583 584 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 585 if (peer.get() == nullptr) { 586 CHECK(IsExceptionPending()); 587 return; 588 } 589 { 590 ScopedObjectAccess soa(this); 591 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 592 } 593 env->CallNonvirtualVoidMethod(peer.get(), 594 WellKnownClasses::java_lang_Thread, 595 WellKnownClasses::java_lang_Thread_init, 596 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 597 AssertNoPendingException(); 598 599 Thread* self = this; 600 DCHECK_EQ(self, Thread::Current()); 601 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 602 reinterpret_cast<jlong>(self)); 603 604 ScopedObjectAccess soa(self); 605 StackHandleScope<1> hs(self); 606 MutableHandle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 607 if (peer_thread_name.Get() == nullptr) { 608 // The Thread constructor should have set the Thread.name to a 609 // non-null value. However, because we can run without code 610 // available (in the compiler, in tests), we manually assign the 611 // fields the constructor should have set. 612 if (runtime->IsActiveTransaction()) { 613 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 614 } else { 615 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 616 } 617 peer_thread_name.Assign(GetThreadName(soa)); 618 } 619 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 620 if (peer_thread_name.Get() != nullptr) { 621 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 622 } 623} 624 625template<bool kTransactionActive> 626void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 627 jobject thread_name, jint thread_priority) { 628 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 629 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 630 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 631 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 632 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 633 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 634 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 635 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 636} 637 638void Thread::SetThreadName(const char* name) { 639 tlsPtr_.name->assign(name); 640 ::art::SetThreadName(name); 641 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 642} 643 644bool Thread::InitStackHwm() { 645 void* read_stack_base; 646 size_t read_stack_size; 647 size_t read_guard_size; 648 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size, &read_guard_size); 649 650 tlsPtr_.stack_begin = reinterpret_cast<uint8_t*>(read_stack_base); 651 tlsPtr_.stack_size = read_stack_size; 652 653 // The minimum stack size we can cope with is the overflow reserved bytes (typically 654 // 8K) + the protected region size (4K) + another page (4K). Typically this will 655 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 656 // between 8K and 12K. 657 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 658 + 4 * KB; 659 if (read_stack_size <= min_stack) { 660 // Note, as we know the stack is small, avoid operations that could use a lot of stack. 661 LogMessage::LogLineLowStack(__PRETTY_FUNCTION__, __LINE__, ERROR, 662 "Attempt to attach a thread with a too-small stack"); 663 return false; 664 } 665 666 // This is included in the SIGQUIT output, but it's useful here for thread debugging. 667 VLOG(threads) << StringPrintf("Native stack is at %p (%s with %s guard)", 668 read_stack_base, 669 PrettySize(read_stack_size).c_str(), 670 PrettySize(read_guard_size).c_str()); 671 672 // Set stack_end_ to the bottom of the stack saving space of stack overflows 673 674 Runtime* runtime = Runtime::Current(); 675 bool implicit_stack_check = !runtime->ExplicitStackOverflowChecks() && !runtime->IsAotCompiler(); 676 ResetDefaultStackEnd(); 677 678 // Install the protected region if we are doing implicit overflow checks. 679 if (implicit_stack_check) { 680 // The thread might have protected region at the bottom. We need 681 // to install our own region so we need to move the limits 682 // of the stack to make room for it. 683 684 tlsPtr_.stack_begin += read_guard_size + kStackOverflowProtectedSize; 685 tlsPtr_.stack_end += read_guard_size + kStackOverflowProtectedSize; 686 tlsPtr_.stack_size -= read_guard_size; 687 688 InstallImplicitProtection(); 689 } 690 691 // Sanity check. 692 int stack_variable; 693 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 694 695 return true; 696} 697 698void Thread::ShortDump(std::ostream& os) const { 699 os << "Thread["; 700 if (GetThreadId() != 0) { 701 // If we're in kStarting, we won't have a thin lock id or tid yet. 702 os << GetThreadId() 703 << ",tid=" << GetTid() << ','; 704 } 705 os << GetState() 706 << ",Thread*=" << this 707 << ",peer=" << tlsPtr_.opeer 708 << ",\"" << (tlsPtr_.name != nullptr ? *tlsPtr_.name : "null") << "\"" 709 << "]"; 710} 711 712void Thread::Dump(std::ostream& os) const { 713 DumpState(os); 714 DumpStack(os); 715} 716 717mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 718 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 719 return (tlsPtr_.opeer != nullptr) ? 720 reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 721} 722 723void Thread::GetThreadName(std::string& name) const { 724 name.assign(*tlsPtr_.name); 725} 726 727uint64_t Thread::GetCpuMicroTime() const { 728#if defined(__linux__) 729 clockid_t cpu_clock_id; 730 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 731 timespec now; 732 clock_gettime(cpu_clock_id, &now); 733 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 734#else // __APPLE__ 735 UNIMPLEMENTED(WARNING); 736 return -1; 737#endif 738} 739 740// Attempt to rectify locks so that we dump thread list with required locks before exiting. 741static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 742 LOG(ERROR) << *thread << " suspend count already zero."; 743 Locks::thread_suspend_count_lock_->Unlock(self); 744 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 745 Locks::mutator_lock_->SharedTryLock(self); 746 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 747 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 748 } 749 } 750 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 751 Locks::thread_list_lock_->TryLock(self); 752 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 753 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 754 } 755 } 756 std::ostringstream ss; 757 Runtime::Current()->GetThreadList()->Dump(ss); 758 LOG(FATAL) << ss.str(); 759} 760 761void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 762 if (kIsDebugBuild) { 763 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 764 << delta << " " << tls32_.debug_suspend_count << " " << this; 765 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 766 Locks::thread_suspend_count_lock_->AssertHeld(self); 767 if (this != self && !IsSuspended()) { 768 Locks::thread_list_lock_->AssertHeld(self); 769 } 770 } 771 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 772 UnsafeLogFatalForSuspendCount(self, this); 773 return; 774 } 775 776 tls32_.suspend_count += delta; 777 if (for_debugger) { 778 tls32_.debug_suspend_count += delta; 779 } 780 781 if (tls32_.suspend_count == 0) { 782 AtomicClearFlag(kSuspendRequest); 783 } else { 784 AtomicSetFlag(kSuspendRequest); 785 TriggerSuspend(); 786 } 787} 788 789void Thread::RunCheckpointFunction() { 790 Closure *checkpoints[kMaxCheckpoints]; 791 792 // Grab the suspend_count lock and copy the current set of 793 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 794 // function will also grab this lock so we prevent a race between setting 795 // the kCheckpointRequest flag and clearing it. 796 { 797 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 798 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 799 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 800 tlsPtr_.checkpoint_functions[i] = nullptr; 801 } 802 AtomicClearFlag(kCheckpointRequest); 803 } 804 805 // Outside the lock, run all the checkpoint functions that 806 // we collected. 807 bool found_checkpoint = false; 808 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 809 if (checkpoints[i] != nullptr) { 810 ATRACE_BEGIN("Checkpoint function"); 811 checkpoints[i]->Run(this); 812 ATRACE_END(); 813 found_checkpoint = true; 814 } 815 } 816 CHECK(found_checkpoint); 817} 818 819bool Thread::RequestCheckpoint(Closure* function) { 820 union StateAndFlags old_state_and_flags; 821 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 822 if (old_state_and_flags.as_struct.state != kRunnable) { 823 return false; // Fail, thread is suspended and so can't run a checkpoint. 824 } 825 826 uint32_t available_checkpoint = kMaxCheckpoints; 827 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 828 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 829 available_checkpoint = i; 830 break; 831 } 832 } 833 if (available_checkpoint == kMaxCheckpoints) { 834 // No checkpoint functions available, we can't run a checkpoint 835 return false; 836 } 837 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 838 839 // Checkpoint function installed now install flag bit. 840 // We must be runnable to request a checkpoint. 841 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 842 union StateAndFlags new_state_and_flags; 843 new_state_and_flags.as_int = old_state_and_flags.as_int; 844 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 845 bool success = tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent( 846 old_state_and_flags.as_int, new_state_and_flags.as_int); 847 if (UNLIKELY(!success)) { 848 // The thread changed state before the checkpoint was installed. 849 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 850 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 851 } else { 852 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 853 TriggerSuspend(); 854 } 855 return success; 856} 857 858Closure* Thread::GetFlipFunction() { 859 Atomic<Closure*>* atomic_func = reinterpret_cast<Atomic<Closure*>*>(&tlsPtr_.flip_function); 860 Closure* func; 861 do { 862 func = atomic_func->LoadRelaxed(); 863 if (func == nullptr) { 864 return nullptr; 865 } 866 } while (!atomic_func->CompareExchangeWeakSequentiallyConsistent(func, nullptr)); 867 DCHECK(func != nullptr); 868 return func; 869} 870 871void Thread::SetFlipFunction(Closure* function) { 872 CHECK(function != nullptr); 873 Atomic<Closure*>* atomic_func = reinterpret_cast<Atomic<Closure*>*>(&tlsPtr_.flip_function); 874 atomic_func->StoreSequentiallyConsistent(function); 875} 876 877void Thread::FullSuspendCheck() { 878 VLOG(threads) << this << " self-suspending"; 879 ATRACE_BEGIN("Full suspend check"); 880 // Make thread appear suspended to other threads, release mutator_lock_. 881 tls32_.suspended_at_suspend_check = true; 882 TransitionFromRunnableToSuspended(kSuspended); 883 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 884 TransitionFromSuspendedToRunnable(); 885 tls32_.suspended_at_suspend_check = false; 886 ATRACE_END(); 887 VLOG(threads) << this << " self-reviving"; 888} 889 890void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 891 std::string group_name; 892 int priority; 893 bool is_daemon = false; 894 Thread* self = Thread::Current(); 895 896 // If flip_function is not null, it means we have run a checkpoint 897 // before the thread wakes up to execute the flip function and the 898 // thread roots haven't been forwarded. So the following access to 899 // the roots (opeer or methods in the frames) would be bad. Run it 900 // here. TODO: clean up. 901 if (thread != nullptr) { 902 ScopedObjectAccessUnchecked soa(self); 903 Thread* this_thread = const_cast<Thread*>(thread); 904 Closure* flip_func = this_thread->GetFlipFunction(); 905 if (flip_func != nullptr) { 906 flip_func->Run(this_thread); 907 } 908 } 909 910 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 911 // cause ScopedObjectAccessUnchecked to deadlock. 912 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 913 ScopedObjectAccessUnchecked soa(self); 914 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 915 ->GetInt(thread->tlsPtr_.opeer); 916 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 917 ->GetBoolean(thread->tlsPtr_.opeer); 918 919 mirror::Object* thread_group = 920 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 921 922 if (thread_group != nullptr) { 923 ArtField* group_name_field = 924 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 925 mirror::String* group_name_string = 926 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 927 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 928 } 929 } else { 930 priority = GetNativePriority(); 931 } 932 933 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 934 if (scheduler_group_name.empty()) { 935 scheduler_group_name = "default"; 936 } 937 938 if (thread != nullptr) { 939 os << '"' << *thread->tlsPtr_.name << '"'; 940 if (is_daemon) { 941 os << " daemon"; 942 } 943 os << " prio=" << priority 944 << " tid=" << thread->GetThreadId() 945 << " " << thread->GetState(); 946 if (thread->IsStillStarting()) { 947 os << " (still starting up)"; 948 } 949 os << "\n"; 950 } else { 951 os << '"' << ::art::GetThreadName(tid) << '"' 952 << " prio=" << priority 953 << " (not attached)\n"; 954 } 955 956 if (thread != nullptr) { 957 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 958 os << " | group=\"" << group_name << "\"" 959 << " sCount=" << thread->tls32_.suspend_count 960 << " dsCount=" << thread->tls32_.debug_suspend_count 961 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 962 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 963 } 964 965 os << " | sysTid=" << tid 966 << " nice=" << getpriority(PRIO_PROCESS, tid) 967 << " cgrp=" << scheduler_group_name; 968 if (thread != nullptr) { 969 int policy; 970 sched_param sp; 971 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 972 __FUNCTION__); 973 os << " sched=" << policy << "/" << sp.sched_priority 974 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 975 } 976 os << "\n"; 977 978 // Grab the scheduler stats for this thread. 979 std::string scheduler_stats; 980 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 981 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 982 } else { 983 scheduler_stats = "0 0 0"; 984 } 985 986 char native_thread_state = '?'; 987 int utime = 0; 988 int stime = 0; 989 int task_cpu = 0; 990 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 991 992 os << " | state=" << native_thread_state 993 << " schedstat=( " << scheduler_stats << " )" 994 << " utm=" << utime 995 << " stm=" << stime 996 << " core=" << task_cpu 997 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 998 if (thread != nullptr) { 999 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 1000 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 1001 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 1002 // Dump the held mutexes. 1003 os << " | held mutexes="; 1004 for (size_t i = 0; i < kLockLevelCount; ++i) { 1005 if (i != kMonitorLock) { 1006 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 1007 if (mutex != nullptr) { 1008 os << " \"" << mutex->GetName() << "\""; 1009 if (mutex->IsReaderWriterMutex()) { 1010 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 1011 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 1012 os << "(exclusive held)"; 1013 } else { 1014 os << "(shared held)"; 1015 } 1016 } 1017 } 1018 } 1019 } 1020 os << "\n"; 1021 } 1022} 1023 1024void Thread::DumpState(std::ostream& os) const { 1025 Thread::DumpState(os, this, GetTid()); 1026} 1027 1028struct StackDumpVisitor : public StackVisitor { 1029 StackDumpVisitor(std::ostream& os_in, Thread* thread_in, Context* context, bool can_allocate_in) 1030 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1031 : StackVisitor(thread_in, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1032 os(os_in), 1033 thread(thread_in), 1034 can_allocate(can_allocate_in), 1035 last_method(nullptr), 1036 last_line_number(0), 1037 repetition_count(0), 1038 frame_count(0) {} 1039 1040 virtual ~StackDumpVisitor() { 1041 if (frame_count == 0) { 1042 os << " (no managed stack frames)\n"; 1043 } 1044 } 1045 1046 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1047 ArtMethod* m = GetMethod(); 1048 if (m->IsRuntimeMethod()) { 1049 return true; 1050 } 1051 const int kMaxRepetition = 3; 1052 mirror::Class* c = m->GetDeclaringClass(); 1053 mirror::DexCache* dex_cache = c->GetDexCache(); 1054 int line_number = -1; 1055 if (dex_cache != nullptr) { // be tolerant of bad input 1056 const DexFile& dex_file = *dex_cache->GetDexFile(); 1057 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 1058 } 1059 if (line_number == last_line_number && last_method == m) { 1060 ++repetition_count; 1061 } else { 1062 if (repetition_count >= kMaxRepetition) { 1063 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 1064 } 1065 repetition_count = 0; 1066 last_line_number = line_number; 1067 last_method = m; 1068 } 1069 if (repetition_count < kMaxRepetition) { 1070 os << " at " << PrettyMethod(m, false); 1071 if (m->IsNative()) { 1072 os << "(Native method)"; 1073 } else { 1074 const char* source_file(m->GetDeclaringClassSourceFile()); 1075 os << "(" << (source_file != nullptr ? source_file : "unavailable") 1076 << ":" << line_number << ")"; 1077 } 1078 os << "\n"; 1079 if (frame_count == 0) { 1080 Monitor::DescribeWait(os, thread); 1081 } 1082 if (can_allocate) { 1083 // Visit locks, but do not abort on errors. This would trigger a nested abort. 1084 Monitor::VisitLocks(this, DumpLockedObject, &os, false); 1085 } 1086 } 1087 1088 ++frame_count; 1089 return true; 1090 } 1091 1092 static void DumpLockedObject(mirror::Object* o, void* context) 1093 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1094 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 1095 os << " - locked "; 1096 if (o == nullptr) { 1097 os << "an unknown object"; 1098 } else { 1099 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 1100 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 1101 // Getting the identity hashcode here would result in lock inflation and suspension of the 1102 // current thread, which isn't safe if this is the only runnable thread. 1103 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 1104 PrettyTypeOf(o).c_str()); 1105 } else { 1106 // IdentityHashCode can cause thread suspension, which would invalidate o if it moved. So 1107 // we get the pretty type beofre we call IdentityHashCode. 1108 const std::string pretty_type(PrettyTypeOf(o)); 1109 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), pretty_type.c_str()); 1110 } 1111 } 1112 os << "\n"; 1113 } 1114 1115 std::ostream& os; 1116 const Thread* thread; 1117 const bool can_allocate; 1118 ArtMethod* last_method; 1119 int last_line_number; 1120 int repetition_count; 1121 int frame_count; 1122}; 1123 1124static bool ShouldShowNativeStack(const Thread* thread) 1125 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1126 ThreadState state = thread->GetState(); 1127 1128 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 1129 if (state > kWaiting && state < kStarting) { 1130 return true; 1131 } 1132 1133 // In an Object.wait variant or Thread.sleep? That's not interesting. 1134 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 1135 return false; 1136 } 1137 1138 // Threads with no managed stack frames should be shown. 1139 const ManagedStack* managed_stack = thread->GetManagedStack(); 1140 if (managed_stack == nullptr || (managed_stack->GetTopQuickFrame() == nullptr && 1141 managed_stack->GetTopShadowFrame() == nullptr)) { 1142 return true; 1143 } 1144 1145 // In some other native method? That's interesting. 1146 // We don't just check kNative because native methods will be in state kSuspended if they're 1147 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 1148 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 1149 ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 1150 return current_method != nullptr && current_method->IsNative(); 1151} 1152 1153void Thread::DumpJavaStack(std::ostream& os) const { 1154 // If flip_function is not null, it means we have run a checkpoint 1155 // before the thread wakes up to execute the flip function and the 1156 // thread roots haven't been forwarded. So the following access to 1157 // the roots (locks or methods in the frames) would be bad. Run it 1158 // here. TODO: clean up. 1159 { 1160 Thread* this_thread = const_cast<Thread*>(this); 1161 Closure* flip_func = this_thread->GetFlipFunction(); 1162 if (flip_func != nullptr) { 1163 flip_func->Run(this_thread); 1164 } 1165 } 1166 1167 // Dumping the Java stack involves the verifier for locks. The verifier operates under the 1168 // assumption that there is no exception pending on entry. Thus, stash any pending exception. 1169 // Thread::Current() instead of this in case a thread is dumping the stack of another suspended 1170 // thread. 1171 StackHandleScope<1> scope(Thread::Current()); 1172 Handle<mirror::Throwable> exc; 1173 bool have_exception = false; 1174 if (IsExceptionPending()) { 1175 exc = scope.NewHandle(GetException()); 1176 const_cast<Thread*>(this)->ClearException(); 1177 have_exception = true; 1178 } 1179 1180 std::unique_ptr<Context> context(Context::Create()); 1181 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 1182 !tls32_.throwing_OutOfMemoryError); 1183 dumper.WalkStack(); 1184 1185 if (have_exception) { 1186 const_cast<Thread*>(this)->SetException(exc.Get()); 1187 } 1188} 1189 1190void Thread::DumpStack(std::ostream& os) const { 1191 // TODO: we call this code when dying but may not have suspended the thread ourself. The 1192 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 1193 // the race with the thread_suspend_count_lock_). 1194 bool dump_for_abort = (gAborting > 0); 1195 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 1196 if (!kIsDebugBuild) { 1197 // We always want to dump the stack for an abort, however, there is no point dumping another 1198 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 1199 safe_to_dump = (safe_to_dump || dump_for_abort); 1200 } 1201 if (safe_to_dump) { 1202 // If we're currently in native code, dump that stack before dumping the managed stack. 1203 if (dump_for_abort || ShouldShowNativeStack(this)) { 1204 DumpKernelStack(os, GetTid(), " kernel: ", false); 1205 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr, !dump_for_abort)); 1206 } 1207 DumpJavaStack(os); 1208 } else { 1209 os << "Not able to dump stack of thread that isn't suspended"; 1210 } 1211} 1212 1213void Thread::ThreadExitCallback(void* arg) { 1214 Thread* self = reinterpret_cast<Thread*>(arg); 1215 if (self->tls32_.thread_exit_check_count == 0) { 1216 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1217 "going to use a pthread_key_create destructor?): " << *self; 1218 CHECK(is_started_); 1219 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1220 self->tls32_.thread_exit_check_count = 1; 1221 } else { 1222 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1223 } 1224} 1225 1226void Thread::Startup() { 1227 CHECK(!is_started_); 1228 is_started_ = true; 1229 { 1230 // MutexLock to keep annotalysis happy. 1231 // 1232 // Note we use null for the thread because Thread::Current can 1233 // return garbage since (is_started_ == true) and 1234 // Thread::pthread_key_self_ is not yet initialized. 1235 // This was seen on glibc. 1236 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1237 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1238 *Locks::thread_suspend_count_lock_); 1239 } 1240 1241 // Allocate a TLS slot. 1242 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), 1243 "self key"); 1244 1245 // Double-check the TLS slot allocation. 1246 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1247 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1248 } 1249} 1250 1251void Thread::FinishStartup() { 1252 Runtime* runtime = Runtime::Current(); 1253 CHECK(runtime->IsStarted()); 1254 1255 // Finish attaching the main thread. 1256 ScopedObjectAccess soa(Thread::Current()); 1257 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1258 1259 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1260} 1261 1262void Thread::Shutdown() { 1263 CHECK(is_started_); 1264 is_started_ = false; 1265 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1266 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1267 if (resume_cond_ != nullptr) { 1268 delete resume_cond_; 1269 resume_cond_ = nullptr; 1270 } 1271} 1272 1273Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1274 wait_mutex_ = new Mutex("a thread wait mutex"); 1275 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1276 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1277 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1278 tlsPtr_.nested_signal_state = static_cast<jmp_buf*>(malloc(sizeof(jmp_buf))); 1279 1280 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1281 tls32_.state_and_flags.as_struct.flags = 0; 1282 tls32_.state_and_flags.as_struct.state = kNative; 1283 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1284 std::fill(tlsPtr_.rosalloc_runs, 1285 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1286 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1287 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1288 tlsPtr_.checkpoint_functions[i] = nullptr; 1289 } 1290 tlsPtr_.flip_function = nullptr; 1291 tls32_.suspended_at_suspend_check = false; 1292} 1293 1294bool Thread::IsStillStarting() const { 1295 // You might think you can check whether the state is kStarting, but for much of thread startup, 1296 // the thread is in kNative; it might also be in kVmWait. 1297 // You might think you can check whether the peer is null, but the peer is actually created and 1298 // assigned fairly early on, and needs to be. 1299 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1300 // this thread _ever_ entered kRunnable". 1301 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1302 (*tlsPtr_.name == kThreadNameDuringStartup); 1303} 1304 1305void Thread::AssertPendingException() const { 1306 CHECK(IsExceptionPending()) << "Pending exception expected."; 1307} 1308 1309void Thread::AssertPendingOOMException() const { 1310 AssertPendingException(); 1311 auto* e = GetException(); 1312 CHECK_EQ(e->GetClass(), DecodeJObject(WellKnownClasses::java_lang_OutOfMemoryError)->AsClass()) 1313 << e->Dump(); 1314} 1315 1316void Thread::AssertNoPendingException() const { 1317 if (UNLIKELY(IsExceptionPending())) { 1318 ScopedObjectAccess soa(Thread::Current()); 1319 mirror::Throwable* exception = GetException(); 1320 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1321 } 1322} 1323 1324void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1325 if (UNLIKELY(IsExceptionPending())) { 1326 ScopedObjectAccess soa(Thread::Current()); 1327 mirror::Throwable* exception = GetException(); 1328 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1329 << exception->Dump(); 1330 } 1331} 1332 1333class MonitorExitVisitor : public SingleRootVisitor { 1334 public: 1335 explicit MonitorExitVisitor(Thread* self) : self_(self) { } 1336 1337 // NO_THREAD_SAFETY_ANALYSIS due to MonitorExit. 1338 void VisitRoot(mirror::Object* entered_monitor, const RootInfo& info ATTRIBUTE_UNUSED) 1339 OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 1340 if (self_->HoldsLock(entered_monitor)) { 1341 LOG(WARNING) << "Calling MonitorExit on object " 1342 << entered_monitor << " (" << PrettyTypeOf(entered_monitor) << ")" 1343 << " left locked by native thread " 1344 << *Thread::Current() << " which is detaching"; 1345 entered_monitor->MonitorExit(self_); 1346 } 1347 } 1348 1349 private: 1350 Thread* const self_; 1351}; 1352 1353void Thread::Destroy() { 1354 Thread* self = this; 1355 DCHECK_EQ(self, Thread::Current()); 1356 1357 if (tlsPtr_.jni_env != nullptr) { 1358 { 1359 ScopedObjectAccess soa(self); 1360 MonitorExitVisitor visitor(self); 1361 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1362 tlsPtr_.jni_env->monitors.VisitRoots(&visitor, RootInfo(kRootVMInternal)); 1363 } 1364 // Release locally held global references which releasing may require the mutator lock. 1365 if (tlsPtr_.jpeer != nullptr) { 1366 // If pthread_create fails we don't have a jni env here. 1367 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1368 tlsPtr_.jpeer = nullptr; 1369 } 1370 if (tlsPtr_.class_loader_override != nullptr) { 1371 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.class_loader_override); 1372 tlsPtr_.class_loader_override = nullptr; 1373 } 1374 } 1375 1376 if (tlsPtr_.opeer != nullptr) { 1377 ScopedObjectAccess soa(self); 1378 // We may need to call user-supplied managed code, do this before final clean-up. 1379 HandleUncaughtExceptions(soa); 1380 RemoveFromThreadGroup(soa); 1381 1382 // this.nativePeer = 0; 1383 if (Runtime::Current()->IsActiveTransaction()) { 1384 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1385 ->SetLong<true>(tlsPtr_.opeer, 0); 1386 } else { 1387 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1388 ->SetLong<false>(tlsPtr_.opeer, 0); 1389 } 1390 Dbg::PostThreadDeath(self); 1391 1392 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1393 // who is waiting. 1394 mirror::Object* lock = 1395 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1396 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1397 if (lock != nullptr) { 1398 StackHandleScope<1> hs(self); 1399 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1400 ObjectLock<mirror::Object> locker(self, h_obj); 1401 locker.NotifyAll(); 1402 } 1403 tlsPtr_.opeer = nullptr; 1404 } 1405 1406 { 1407 ScopedObjectAccess soa(self); 1408 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1409 } 1410} 1411 1412Thread::~Thread() { 1413 CHECK(tlsPtr_.class_loader_override == nullptr); 1414 CHECK(tlsPtr_.jpeer == nullptr); 1415 CHECK(tlsPtr_.opeer == nullptr); 1416 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1417 if (initialized) { 1418 delete tlsPtr_.jni_env; 1419 tlsPtr_.jni_env = nullptr; 1420 } 1421 CHECK_NE(GetState(), kRunnable); 1422 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1423 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1424 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1425 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1426 CHECK(tlsPtr_.flip_function == nullptr); 1427 CHECK_EQ(tls32_.suspended_at_suspend_check, false); 1428 1429 // We may be deleting a still born thread. 1430 SetStateUnsafe(kTerminated); 1431 1432 delete wait_cond_; 1433 delete wait_mutex_; 1434 1435 if (tlsPtr_.long_jump_context != nullptr) { 1436 delete tlsPtr_.long_jump_context; 1437 } 1438 1439 if (initialized) { 1440 CleanupCpu(); 1441 } 1442 1443 if (tlsPtr_.single_step_control != nullptr) { 1444 delete tlsPtr_.single_step_control; 1445 } 1446 delete tlsPtr_.instrumentation_stack; 1447 delete tlsPtr_.name; 1448 delete tlsPtr_.stack_trace_sample; 1449 free(tlsPtr_.nested_signal_state); 1450 1451 Runtime::Current()->GetHeap()->AssertThreadLocalBuffersAreRevoked(this); 1452 1453 TearDownAlternateSignalStack(); 1454} 1455 1456void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1457 if (!IsExceptionPending()) { 1458 return; 1459 } 1460 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1461 ScopedThreadStateChange tsc(this, kNative); 1462 1463 // Get and clear the exception. 1464 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1465 tlsPtr_.jni_env->ExceptionClear(); 1466 1467 // If the thread has its own handler, use that. 1468 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1469 tlsPtr_.jni_env->GetObjectField(peer.get(), 1470 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1471 if (handler.get() == nullptr) { 1472 // Otherwise use the thread group's default handler. 1473 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1474 WellKnownClasses::java_lang_Thread_group)); 1475 } 1476 1477 // Call the handler. 1478 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1479 WellKnownClasses::java_lang_Thread__UncaughtExceptionHandler_uncaughtException, 1480 peer.get(), exception.get()); 1481 1482 // If the handler threw, clear that exception too. 1483 tlsPtr_.jni_env->ExceptionClear(); 1484} 1485 1486void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1487 // this.group.removeThread(this); 1488 // group can be null if we're in the compiler or a test. 1489 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1490 ->GetObject(tlsPtr_.opeer); 1491 if (ogroup != nullptr) { 1492 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1493 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1494 ScopedThreadStateChange tsc(soa.Self(), kNative); 1495 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1496 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1497 peer.get()); 1498 } 1499} 1500 1501size_t Thread::NumHandleReferences() { 1502 size_t count = 0; 1503 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur != nullptr; cur = cur->GetLink()) { 1504 count += cur->NumberOfReferences(); 1505 } 1506 return count; 1507} 1508 1509bool Thread::HandleScopeContains(jobject obj) const { 1510 StackReference<mirror::Object>* hs_entry = 1511 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1512 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur!= nullptr; cur = cur->GetLink()) { 1513 if (cur->Contains(hs_entry)) { 1514 return true; 1515 } 1516 } 1517 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1518 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1519} 1520 1521void Thread::HandleScopeVisitRoots(RootVisitor* visitor, uint32_t thread_id) { 1522 BufferedRootVisitor<kDefaultBufferedRootCount> buffered_visitor( 1523 visitor, RootInfo(kRootNativeStack, thread_id)); 1524 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1525 for (size_t j = 0, count = cur->NumberOfReferences(); j < count; ++j) { 1526 // GetReference returns a pointer to the stack reference within the handle scope. If this 1527 // needs to be updated, it will be done by the root visitor. 1528 buffered_visitor.VisitRootIfNonNull(cur->GetHandle(j).GetReference()); 1529 } 1530 } 1531} 1532 1533mirror::Object* Thread::DecodeJObject(jobject obj) const { 1534 if (obj == nullptr) { 1535 return nullptr; 1536 } 1537 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1538 IndirectRefKind kind = GetIndirectRefKind(ref); 1539 mirror::Object* result; 1540 bool expect_null = false; 1541 // The "kinds" below are sorted by the frequency we expect to encounter them. 1542 if (kind == kLocal) { 1543 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1544 // Local references do not need a read barrier. 1545 result = locals.Get<kWithoutReadBarrier>(ref); 1546 } else if (kind == kHandleScopeOrInvalid) { 1547 // TODO: make stack indirect reference table lookup more efficient. 1548 // Check if this is a local reference in the handle scope. 1549 if (LIKELY(HandleScopeContains(obj))) { 1550 // Read from handle scope. 1551 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1552 VerifyObject(result); 1553 } else { 1554 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of invalid jobject %p", obj); 1555 expect_null = true; 1556 result = nullptr; 1557 } 1558 } else if (kind == kGlobal) { 1559 result = tlsPtr_.jni_env->vm->DecodeGlobal(const_cast<Thread*>(this), ref); 1560 } else { 1561 DCHECK_EQ(kind, kWeakGlobal); 1562 result = tlsPtr_.jni_env->vm->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1563 if (Runtime::Current()->IsClearedJniWeakGlobal(result)) { 1564 // This is a special case where it's okay to return null. 1565 expect_null = true; 1566 result = nullptr; 1567 } 1568 } 1569 1570 if (UNLIKELY(!expect_null && result == nullptr)) { 1571 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of deleted %s %p", 1572 ToStr<IndirectRefKind>(kind).c_str(), obj); 1573 } 1574 return result; 1575} 1576 1577// Implements java.lang.Thread.interrupted. 1578bool Thread::Interrupted() { 1579 MutexLock mu(Thread::Current(), *wait_mutex_); 1580 bool interrupted = IsInterruptedLocked(); 1581 SetInterruptedLocked(false); 1582 return interrupted; 1583} 1584 1585// Implements java.lang.Thread.isInterrupted. 1586bool Thread::IsInterrupted() { 1587 MutexLock mu(Thread::Current(), *wait_mutex_); 1588 return IsInterruptedLocked(); 1589} 1590 1591void Thread::Interrupt(Thread* self) { 1592 MutexLock mu(self, *wait_mutex_); 1593 if (interrupted_) { 1594 return; 1595 } 1596 interrupted_ = true; 1597 NotifyLocked(self); 1598} 1599 1600void Thread::Notify() { 1601 Thread* self = Thread::Current(); 1602 MutexLock mu(self, *wait_mutex_); 1603 NotifyLocked(self); 1604} 1605 1606void Thread::NotifyLocked(Thread* self) { 1607 if (wait_monitor_ != nullptr) { 1608 wait_cond_->Signal(self); 1609 } 1610} 1611 1612void Thread::SetClassLoaderOverride(jobject class_loader_override) { 1613 if (tlsPtr_.class_loader_override != nullptr) { 1614 GetJniEnv()->DeleteGlobalRef(tlsPtr_.class_loader_override); 1615 } 1616 tlsPtr_.class_loader_override = GetJniEnv()->NewGlobalRef(class_loader_override); 1617} 1618 1619class CountStackDepthVisitor : public StackVisitor { 1620 public: 1621 explicit CountStackDepthVisitor(Thread* thread) 1622 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1623 : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1624 depth_(0), skip_depth_(0), skipping_(true) {} 1625 1626 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1627 // We want to skip frames up to and including the exception's constructor. 1628 // Note we also skip the frame if it doesn't have a method (namely the callee 1629 // save frame) 1630 ArtMethod* m = GetMethod(); 1631 if (skipping_ && !m->IsRuntimeMethod() && 1632 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1633 skipping_ = false; 1634 } 1635 if (!skipping_) { 1636 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1637 ++depth_; 1638 } 1639 } else { 1640 ++skip_depth_; 1641 } 1642 return true; 1643 } 1644 1645 int GetDepth() const { 1646 return depth_; 1647 } 1648 1649 int GetSkipDepth() const { 1650 return skip_depth_; 1651 } 1652 1653 private: 1654 uint32_t depth_; 1655 uint32_t skip_depth_; 1656 bool skipping_; 1657}; 1658 1659template<bool kTransactionActive> 1660class BuildInternalStackTraceVisitor : public StackVisitor { 1661 public: 1662 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1663 : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1664 self_(self), 1665 skip_depth_(skip_depth), 1666 count_(0), 1667 trace_(nullptr), 1668 pointer_size_(Runtime::Current()->GetClassLinker()->GetImagePointerSize()) {} 1669 1670 bool Init(int depth) 1671 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1672 // Allocate method trace with format [method pointers][pcs]. 1673 auto* cl = Runtime::Current()->GetClassLinker(); 1674 trace_ = cl->AllocPointerArray(self_, depth * 2); 1675 if (trace_ == nullptr) { 1676 self_->AssertPendingOOMException(); 1677 return false; 1678 } 1679 // If We are called from native, use non-transactional mode. 1680 const char* last_no_suspend_cause = 1681 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1682 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1683 return true; 1684 } 1685 1686 virtual ~BuildInternalStackTraceVisitor() { 1687 if (trace_ != nullptr) { 1688 self_->EndAssertNoThreadSuspension(nullptr); 1689 } 1690 } 1691 1692 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1693 if (trace_ == nullptr) { 1694 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1695 } 1696 if (skip_depth_ > 0) { 1697 skip_depth_--; 1698 return true; 1699 } 1700 ArtMethod* m = GetMethod(); 1701 if (m->IsRuntimeMethod()) { 1702 return true; // Ignore runtime frames (in particular callee save). 1703 } 1704 trace_->SetElementPtrSize<kTransactionActive>( 1705 count_, m, pointer_size_); 1706 trace_->SetElementPtrSize<kTransactionActive>( 1707 trace_->GetLength() / 2 + count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc(), 1708 pointer_size_); 1709 ++count_; 1710 return true; 1711 } 1712 1713 mirror::PointerArray* GetInternalStackTrace() const { 1714 return trace_; 1715 } 1716 1717 private: 1718 Thread* const self_; 1719 // How many more frames to skip. 1720 int32_t skip_depth_; 1721 // Current position down stack trace. 1722 uint32_t count_; 1723 // An array of the methods on the stack, the last entries are the dex PCs. 1724 mirror::PointerArray* trace_; 1725 // For cross compilation. 1726 size_t pointer_size_; 1727}; 1728 1729template<bool kTransactionActive> 1730jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1731 // Compute depth of stack 1732 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1733 count_visitor.WalkStack(); 1734 int32_t depth = count_visitor.GetDepth(); 1735 int32_t skip_depth = count_visitor.GetSkipDepth(); 1736 1737 // Build internal stack trace. 1738 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1739 const_cast<Thread*>(this), 1740 skip_depth); 1741 if (!build_trace_visitor.Init(depth)) { 1742 return nullptr; // Allocation failed. 1743 } 1744 build_trace_visitor.WalkStack(); 1745 mirror::PointerArray* trace = build_trace_visitor.GetInternalStackTrace(); 1746 if (kIsDebugBuild) { 1747 // Second half is dex PCs. 1748 for (uint32_t i = 0; i < static_cast<uint32_t>(trace->GetLength() / 2); ++i) { 1749 auto* method = trace->GetElementPtrSize<ArtMethod*>( 1750 i, Runtime::Current()->GetClassLinker()->GetImagePointerSize()); 1751 CHECK(method != nullptr); 1752 } 1753 } 1754 return soa.AddLocalReference<jobject>(trace); 1755} 1756template jobject Thread::CreateInternalStackTrace<false>( 1757 const ScopedObjectAccessAlreadyRunnable& soa) const; 1758template jobject Thread::CreateInternalStackTrace<true>( 1759 const ScopedObjectAccessAlreadyRunnable& soa) const; 1760 1761bool Thread::IsExceptionThrownByCurrentMethod(mirror::Throwable* exception) const { 1762 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1763 count_visitor.WalkStack(); 1764 return count_visitor.GetDepth() == exception->GetStackDepth(); 1765} 1766 1767jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1768 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1769 int* stack_depth) { 1770 // Decode the internal stack trace into the depth, method trace and PC trace 1771 int32_t depth = soa.Decode<mirror::PointerArray*>(internal)->GetLength() / 2; 1772 1773 auto* cl = Runtime::Current()->GetClassLinker(); 1774 1775 jobjectArray result; 1776 1777 if (output_array != nullptr) { 1778 // Reuse the array we were given. 1779 result = output_array; 1780 // ...adjusting the number of frames we'll write to not exceed the array length. 1781 const int32_t traces_length = 1782 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1783 depth = std::min(depth, traces_length); 1784 } else { 1785 // Create java_trace array and place in local reference table 1786 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1787 cl->AllocStackTraceElementArray(soa.Self(), depth); 1788 if (java_traces == nullptr) { 1789 return nullptr; 1790 } 1791 result = soa.AddLocalReference<jobjectArray>(java_traces); 1792 } 1793 1794 if (stack_depth != nullptr) { 1795 *stack_depth = depth; 1796 } 1797 1798 for (int32_t i = 0; i < depth; ++i) { 1799 auto* method_trace = soa.Decode<mirror::PointerArray*>(internal); 1800 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1801 ArtMethod* method = method_trace->GetElementPtrSize<ArtMethod*>(i, sizeof(void*)); 1802 uint32_t dex_pc = method_trace->GetElementPtrSize<uint32_t>( 1803 i + method_trace->GetLength() / 2, sizeof(void*)); 1804 int32_t line_number; 1805 StackHandleScope<3> hs(soa.Self()); 1806 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1807 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1808 if (method->IsProxyMethod()) { 1809 line_number = -1; 1810 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1811 // source_name_object intentionally left null for proxy methods 1812 } else { 1813 line_number = method->GetLineNumFromDexPC(dex_pc); 1814 // Allocate element, potentially triggering GC 1815 // TODO: reuse class_name_object via Class::name_? 1816 const char* descriptor = method->GetDeclaringClassDescriptor(); 1817 CHECK(descriptor != nullptr); 1818 std::string class_name(PrettyDescriptor(descriptor)); 1819 class_name_object.Assign( 1820 mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1821 if (class_name_object.Get() == nullptr) { 1822 soa.Self()->AssertPendingOOMException(); 1823 return nullptr; 1824 } 1825 const char* source_file = method->GetDeclaringClassSourceFile(); 1826 if (source_file != nullptr) { 1827 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1828 if (source_name_object.Get() == nullptr) { 1829 soa.Self()->AssertPendingOOMException(); 1830 return nullptr; 1831 } 1832 } 1833 } 1834 const char* method_name = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetName(); 1835 CHECK(method_name != nullptr); 1836 Handle<mirror::String> method_name_object( 1837 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1838 if (method_name_object.Get() == nullptr) { 1839 return nullptr; 1840 } 1841 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1842 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1843 if (obj == nullptr) { 1844 return nullptr; 1845 } 1846 // We are called from native: use non-transactional mode. 1847 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1848 } 1849 return result; 1850} 1851 1852void Thread::ThrowNewExceptionF(const char* exception_class_descriptor, const char* fmt, ...) { 1853 va_list args; 1854 va_start(args, fmt); 1855 ThrowNewExceptionV(exception_class_descriptor, fmt, args); 1856 va_end(args); 1857} 1858 1859void Thread::ThrowNewExceptionV(const char* exception_class_descriptor, 1860 const char* fmt, va_list ap) { 1861 std::string msg; 1862 StringAppendV(&msg, fmt, ap); 1863 ThrowNewException(exception_class_descriptor, msg.c_str()); 1864} 1865 1866void Thread::ThrowNewException(const char* exception_class_descriptor, 1867 const char* msg) { 1868 // Callers should either clear or call ThrowNewWrappedException. 1869 AssertNoPendingExceptionForNewException(msg); 1870 ThrowNewWrappedException(exception_class_descriptor, msg); 1871} 1872 1873static mirror::ClassLoader* GetCurrentClassLoader(Thread* self) 1874 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1875 ArtMethod* method = self->GetCurrentMethod(nullptr); 1876 return method != nullptr 1877 ? method->GetDeclaringClass()->GetClassLoader() 1878 : nullptr; 1879} 1880 1881void Thread::ThrowNewWrappedException(const char* exception_class_descriptor, 1882 const char* msg) { 1883 DCHECK_EQ(this, Thread::Current()); 1884 ScopedObjectAccessUnchecked soa(this); 1885 StackHandleScope<3> hs(soa.Self()); 1886 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(GetCurrentClassLoader(soa.Self()))); 1887 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException())); 1888 ClearException(); 1889 Runtime* runtime = Runtime::Current(); 1890 auto* cl = runtime->GetClassLinker(); 1891 Handle<mirror::Class> exception_class( 1892 hs.NewHandle(cl->FindClass(this, exception_class_descriptor, class_loader))); 1893 if (UNLIKELY(exception_class.Get() == nullptr)) { 1894 CHECK(IsExceptionPending()); 1895 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1896 return; 1897 } 1898 1899 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(soa.Self(), exception_class, true, 1900 true))) { 1901 DCHECK(IsExceptionPending()); 1902 return; 1903 } 1904 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1905 Handle<mirror::Throwable> exception( 1906 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1907 1908 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1909 if (exception.Get() == nullptr) { 1910 SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1911 return; 1912 } 1913 1914 // Choose an appropriate constructor and set up the arguments. 1915 const char* signature; 1916 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1917 if (msg != nullptr) { 1918 // Ensure we remember this and the method over the String allocation. 1919 msg_string.reset( 1920 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1921 if (UNLIKELY(msg_string.get() == nullptr)) { 1922 CHECK(IsExceptionPending()); // OOME. 1923 return; 1924 } 1925 if (cause.get() == nullptr) { 1926 signature = "(Ljava/lang/String;)V"; 1927 } else { 1928 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1929 } 1930 } else { 1931 if (cause.get() == nullptr) { 1932 signature = "()V"; 1933 } else { 1934 signature = "(Ljava/lang/Throwable;)V"; 1935 } 1936 } 1937 ArtMethod* exception_init_method = 1938 exception_class->FindDeclaredDirectMethod("<init>", signature, cl->GetImagePointerSize()); 1939 1940 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1941 << PrettyDescriptor(exception_class_descriptor); 1942 1943 if (UNLIKELY(!runtime->IsStarted())) { 1944 // Something is trying to throw an exception without a started runtime, which is the common 1945 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1946 // the exception fields directly. 1947 if (msg != nullptr) { 1948 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1949 } 1950 if (cause.get() != nullptr) { 1951 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1952 } 1953 ScopedLocalRef<jobject> trace(GetJniEnv(), 1954 Runtime::Current()->IsActiveTransaction() 1955 ? CreateInternalStackTrace<true>(soa) 1956 : CreateInternalStackTrace<false>(soa)); 1957 if (trace.get() != nullptr) { 1958 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1959 } 1960 SetException(exception.Get()); 1961 } else { 1962 jvalue jv_args[2]; 1963 size_t i = 0; 1964 1965 if (msg != nullptr) { 1966 jv_args[i].l = msg_string.get(); 1967 ++i; 1968 } 1969 if (cause.get() != nullptr) { 1970 jv_args[i].l = cause.get(); 1971 ++i; 1972 } 1973 ScopedLocalRef<jobject> ref(soa.Env(), soa.AddLocalReference<jobject>(exception.Get())); 1974 InvokeWithJValues(soa, ref.get(), soa.EncodeMethod(exception_init_method), jv_args); 1975 if (LIKELY(!IsExceptionPending())) { 1976 SetException(exception.Get()); 1977 } 1978 } 1979} 1980 1981void Thread::ThrowOutOfMemoryError(const char* msg) { 1982 LOG(WARNING) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1983 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1984 if (!tls32_.throwing_OutOfMemoryError) { 1985 tls32_.throwing_OutOfMemoryError = true; 1986 ThrowNewException("Ljava/lang/OutOfMemoryError;", msg); 1987 tls32_.throwing_OutOfMemoryError = false; 1988 } else { 1989 Dump(LOG(WARNING)); // The pre-allocated OOME has no stack, so help out and log one. 1990 SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1991 } 1992} 1993 1994Thread* Thread::CurrentFromGdb() { 1995 return Thread::Current(); 1996} 1997 1998void Thread::DumpFromGdb() const { 1999 std::ostringstream ss; 2000 Dump(ss); 2001 std::string str(ss.str()); 2002 // log to stderr for debugging command line processes 2003 std::cerr << str; 2004#ifdef HAVE_ANDROID_OS 2005 // log to logcat for debugging frameworks processes 2006 LOG(INFO) << str; 2007#endif 2008} 2009 2010// Explicitly instantiate 32 and 64bit thread offset dumping support. 2011template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 2012template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 2013 2014template<size_t ptr_size> 2015void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 2016#define DO_THREAD_OFFSET(x, y) \ 2017 if (offset == x.Uint32Value()) { \ 2018 os << y; \ 2019 return; \ 2020 } 2021 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 2022 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 2023 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 2024 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 2025 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 2026 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 2027 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 2028 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 2029 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 2030 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 2031 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 2032 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 2033#undef DO_THREAD_OFFSET 2034 2035#define INTERPRETER_ENTRY_POINT_INFO(x) \ 2036 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2037 os << #x; \ 2038 return; \ 2039 } 2040 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 2041 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 2042#undef INTERPRETER_ENTRY_POINT_INFO 2043 2044#define JNI_ENTRY_POINT_INFO(x) \ 2045 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2046 os << #x; \ 2047 return; \ 2048 } 2049 JNI_ENTRY_POINT_INFO(pDlsymLookup) 2050#undef JNI_ENTRY_POINT_INFO 2051 2052#define QUICK_ENTRY_POINT_INFO(x) \ 2053 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2054 os << #x; \ 2055 return; \ 2056 } 2057 QUICK_ENTRY_POINT_INFO(pAllocArray) 2058 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 2059 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 2060 QUICK_ENTRY_POINT_INFO(pAllocObject) 2061 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 2062 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 2063 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 2064 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 2065 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 2066 QUICK_ENTRY_POINT_INFO(pAllocStringFromBytes) 2067 QUICK_ENTRY_POINT_INFO(pAllocStringFromChars) 2068 QUICK_ENTRY_POINT_INFO(pAllocStringFromString) 2069 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 2070 QUICK_ENTRY_POINT_INFO(pCheckCast) 2071 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 2072 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 2073 QUICK_ENTRY_POINT_INFO(pInitializeType) 2074 QUICK_ENTRY_POINT_INFO(pResolveString) 2075 QUICK_ENTRY_POINT_INFO(pSet8Instance) 2076 QUICK_ENTRY_POINT_INFO(pSet8Static) 2077 QUICK_ENTRY_POINT_INFO(pSet16Instance) 2078 QUICK_ENTRY_POINT_INFO(pSet16Static) 2079 QUICK_ENTRY_POINT_INFO(pSet32Instance) 2080 QUICK_ENTRY_POINT_INFO(pSet32Static) 2081 QUICK_ENTRY_POINT_INFO(pSet64Instance) 2082 QUICK_ENTRY_POINT_INFO(pSet64Static) 2083 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 2084 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 2085 QUICK_ENTRY_POINT_INFO(pGetByteInstance) 2086 QUICK_ENTRY_POINT_INFO(pGetBooleanInstance) 2087 QUICK_ENTRY_POINT_INFO(pGetByteStatic) 2088 QUICK_ENTRY_POINT_INFO(pGetBooleanStatic) 2089 QUICK_ENTRY_POINT_INFO(pGetShortInstance) 2090 QUICK_ENTRY_POINT_INFO(pGetCharInstance) 2091 QUICK_ENTRY_POINT_INFO(pGetShortStatic) 2092 QUICK_ENTRY_POINT_INFO(pGetCharStatic) 2093 QUICK_ENTRY_POINT_INFO(pGet32Instance) 2094 QUICK_ENTRY_POINT_INFO(pGet32Static) 2095 QUICK_ENTRY_POINT_INFO(pGet64Instance) 2096 QUICK_ENTRY_POINT_INFO(pGet64Static) 2097 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 2098 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 2099 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 2100 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 2101 QUICK_ENTRY_POINT_INFO(pAputObject) 2102 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 2103 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 2104 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 2105 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 2106 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 2107 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 2108 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 2109 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 2110 QUICK_ENTRY_POINT_INFO(pLockObject) 2111 QUICK_ENTRY_POINT_INFO(pUnlockObject) 2112 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 2113 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 2114 QUICK_ENTRY_POINT_INFO(pCmplDouble) 2115 QUICK_ENTRY_POINT_INFO(pCmplFloat) 2116 QUICK_ENTRY_POINT_INFO(pFmod) 2117 QUICK_ENTRY_POINT_INFO(pL2d) 2118 QUICK_ENTRY_POINT_INFO(pFmodf) 2119 QUICK_ENTRY_POINT_INFO(pL2f) 2120 QUICK_ENTRY_POINT_INFO(pD2iz) 2121 QUICK_ENTRY_POINT_INFO(pF2iz) 2122 QUICK_ENTRY_POINT_INFO(pIdivmod) 2123 QUICK_ENTRY_POINT_INFO(pD2l) 2124 QUICK_ENTRY_POINT_INFO(pF2l) 2125 QUICK_ENTRY_POINT_INFO(pLdiv) 2126 QUICK_ENTRY_POINT_INFO(pLmod) 2127 QUICK_ENTRY_POINT_INFO(pLmul) 2128 QUICK_ENTRY_POINT_INFO(pShlLong) 2129 QUICK_ENTRY_POINT_INFO(pShrLong) 2130 QUICK_ENTRY_POINT_INFO(pUshrLong) 2131 QUICK_ENTRY_POINT_INFO(pIndexOf) 2132 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 2133 QUICK_ENTRY_POINT_INFO(pMemcpy) 2134 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 2135 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 2136 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 2137 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 2138 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 2139 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 2140 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 2141 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 2142 QUICK_ENTRY_POINT_INFO(pTestSuspend) 2143 QUICK_ENTRY_POINT_INFO(pDeliverException) 2144 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 2145 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 2146 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 2147 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 2148 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 2149 QUICK_ENTRY_POINT_INFO(pDeoptimize) 2150 QUICK_ENTRY_POINT_INFO(pA64Load) 2151 QUICK_ENTRY_POINT_INFO(pA64Store) 2152 QUICK_ENTRY_POINT_INFO(pNewEmptyString) 2153 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_B) 2154 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BI) 2155 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BII) 2156 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIII) 2157 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIIString) 2158 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BString) 2159 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIICharset) 2160 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BCharset) 2161 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_C) 2162 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_CII) 2163 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_IIC) 2164 QUICK_ENTRY_POINT_INFO(pNewStringFromCodePoints) 2165 QUICK_ENTRY_POINT_INFO(pNewStringFromString) 2166 QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuffer) 2167 QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuilder) 2168 QUICK_ENTRY_POINT_INFO(pReadBarrierJni) 2169#undef QUICK_ENTRY_POINT_INFO 2170 2171 os << offset; 2172} 2173 2174void Thread::QuickDeliverException() { 2175 // Get exception from thread. 2176 mirror::Throwable* exception = GetException(); 2177 CHECK(exception != nullptr); 2178 // Don't leave exception visible while we try to find the handler, which may cause class 2179 // resolution. 2180 ClearException(); 2181 bool is_deoptimization = (exception == GetDeoptimizationException()); 2182 QuickExceptionHandler exception_handler(this, is_deoptimization); 2183 if (is_deoptimization) { 2184 exception_handler.DeoptimizeStack(); 2185 } else { 2186 exception_handler.FindCatch(exception); 2187 } 2188 exception_handler.UpdateInstrumentationStack(); 2189 exception_handler.DoLongJump(); 2190} 2191 2192Context* Thread::GetLongJumpContext() { 2193 Context* result = tlsPtr_.long_jump_context; 2194 if (result == nullptr) { 2195 result = Context::Create(); 2196 } else { 2197 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 2198 result->Reset(); 2199 } 2200 return result; 2201} 2202 2203// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 2204// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 2205struct CurrentMethodVisitor FINAL : public StackVisitor { 2206 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 2207 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2208 : StackVisitor(thread, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 2209 this_object_(nullptr), 2210 method_(nullptr), 2211 dex_pc_(0), 2212 abort_on_error_(abort_on_error) {} 2213 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2214 ArtMethod* m = GetMethod(); 2215 if (m->IsRuntimeMethod()) { 2216 // Continue if this is a runtime method. 2217 return true; 2218 } 2219 if (context_ != nullptr) { 2220 this_object_ = GetThisObject(); 2221 } 2222 method_ = m; 2223 dex_pc_ = GetDexPc(abort_on_error_); 2224 return false; 2225 } 2226 mirror::Object* this_object_; 2227 ArtMethod* method_; 2228 uint32_t dex_pc_; 2229 const bool abort_on_error_; 2230}; 2231 2232ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 2233 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 2234 visitor.WalkStack(false); 2235 if (dex_pc != nullptr) { 2236 *dex_pc = visitor.dex_pc_; 2237 } 2238 return visitor.method_; 2239} 2240 2241bool Thread::HoldsLock(mirror::Object* object) const { 2242 if (object == nullptr) { 2243 return false; 2244 } 2245 return object->GetLockOwnerThreadId() == GetThreadId(); 2246} 2247 2248// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2249template <typename RootVisitor> 2250class ReferenceMapVisitor : public StackVisitor { 2251 public: 2252 ReferenceMapVisitor(Thread* thread, Context* context, RootVisitor& visitor) 2253 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2254 // We are visiting the references in compiled frames, so we do not need 2255 // to know the inlined frames. 2256 : StackVisitor(thread, context, StackVisitor::StackWalkKind::kSkipInlinedFrames), 2257 visitor_(visitor) {} 2258 2259 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2260 if (false) { 2261 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2262 << StringPrintf("@ PC:%04x", GetDexPc()); 2263 } 2264 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2265 if (shadow_frame != nullptr) { 2266 VisitShadowFrame(shadow_frame); 2267 } else { 2268 VisitQuickFrame(); 2269 } 2270 return true; 2271 } 2272 2273 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2274 ArtMethod* m = shadow_frame->GetMethod(); 2275 DCHECK(m != nullptr); 2276 size_t num_regs = shadow_frame->NumberOfVRegs(); 2277 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2278 // handle scope for JNI or References for interpreter. 2279 for (size_t reg = 0; reg < num_regs; ++reg) { 2280 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2281 if (ref != nullptr) { 2282 mirror::Object* new_ref = ref; 2283 visitor_(&new_ref, reg, this); 2284 if (new_ref != ref) { 2285 shadow_frame->SetVRegReference(reg, new_ref); 2286 } 2287 } 2288 } 2289 } else { 2290 // Java method. 2291 // Portable path use DexGcMap and store in Method.native_gc_map_. 2292 const uint8_t* gc_map = m->GetNativeGcMap(sizeof(void*)); 2293 CHECK(gc_map != nullptr) << PrettyMethod(m); 2294 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2295 uint32_t dex_pc = shadow_frame->GetDexPC(); 2296 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2297 DCHECK(reg_bitmap != nullptr); 2298 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2299 for (size_t reg = 0; reg < num_regs; ++reg) { 2300 if (TestBitmap(reg, reg_bitmap)) { 2301 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2302 if (ref != nullptr) { 2303 mirror::Object* new_ref = ref; 2304 visitor_(&new_ref, reg, this); 2305 if (new_ref != ref) { 2306 shadow_frame->SetVRegReference(reg, new_ref); 2307 } 2308 } 2309 } 2310 } 2311 } 2312 } 2313 2314 private: 2315 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2316 auto* cur_quick_frame = GetCurrentQuickFrame(); 2317 DCHECK(cur_quick_frame != nullptr); 2318 auto* m = *cur_quick_frame; 2319 2320 // Process register map (which native and runtime methods don't have) 2321 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2322 if (m->IsOptimized(sizeof(void*))) { 2323 auto* vreg_base = reinterpret_cast<StackReference<mirror::Object>*>( 2324 reinterpret_cast<uintptr_t>(cur_quick_frame)); 2325 Runtime* runtime = Runtime::Current(); 2326 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2327 uintptr_t native_pc_offset = m->NativeQuickPcOffset(GetCurrentQuickFramePc(), entry_point); 2328 CodeInfo code_info = m->GetOptimizedCodeInfo(); 2329 StackMapEncoding encoding = code_info.ExtractEncoding(); 2330 StackMap map = code_info.GetStackMapForNativePcOffset(native_pc_offset, encoding); 2331 DCHECK(map.IsValid()); 2332 MemoryRegion mask = map.GetStackMask(encoding); 2333 // Visit stack entries that hold pointers. 2334 for (size_t i = 0; i < mask.size_in_bits(); ++i) { 2335 if (mask.LoadBit(i)) { 2336 auto* ref_addr = vreg_base + i; 2337 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2338 if (ref != nullptr) { 2339 mirror::Object* new_ref = ref; 2340 visitor_(&new_ref, -1, this); 2341 if (ref != new_ref) { 2342 ref_addr->Assign(new_ref); 2343 } 2344 } 2345 } 2346 } 2347 // Visit callee-save registers that hold pointers. 2348 uint32_t register_mask = map.GetRegisterMask(encoding); 2349 for (size_t i = 0; i < BitSizeOf<uint32_t>(); ++i) { 2350 if (register_mask & (1 << i)) { 2351 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(i)); 2352 if (*ref_addr != nullptr) { 2353 visitor_(ref_addr, -1, this); 2354 } 2355 } 2356 } 2357 } else { 2358 const uint8_t* native_gc_map = m->GetNativeGcMap(sizeof(void*)); 2359 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2360 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2361 // Can't be null or how would we compile its instructions? 2362 DCHECK(code_item != nullptr) << PrettyMethod(m); 2363 NativePcOffsetToReferenceMap map(native_gc_map); 2364 size_t num_regs = map.RegWidth() * 8; 2365 if (num_regs > 0) { 2366 Runtime* runtime = Runtime::Current(); 2367 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2368 uintptr_t native_pc_offset = m->NativeQuickPcOffset(GetCurrentQuickFramePc(), entry_point); 2369 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2370 DCHECK(reg_bitmap != nullptr); 2371 const void* code_pointer = ArtMethod::EntryPointToCodePointer(entry_point); 2372 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 2373 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2374 // For all dex registers in the bitmap 2375 DCHECK(cur_quick_frame != nullptr); 2376 for (size_t reg = 0; reg < num_regs; ++reg) { 2377 // Does this register hold a reference? 2378 if (TestBitmap(reg, reg_bitmap)) { 2379 uint32_t vmap_offset; 2380 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2381 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2382 kReferenceVReg); 2383 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2384 mirror::Object** ref_addr = 2385 reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2386 if (*ref_addr != nullptr) { 2387 visitor_(ref_addr, reg, this); 2388 } 2389 } else { 2390 StackReference<mirror::Object>* ref_addr = 2391 reinterpret_cast<StackReference<mirror::Object>*>(GetVRegAddrFromQuickCode( 2392 cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2393 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2394 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2395 if (ref != nullptr) { 2396 mirror::Object* new_ref = ref; 2397 visitor_(&new_ref, reg, this); 2398 if (ref != new_ref) { 2399 ref_addr->Assign(new_ref); 2400 } 2401 } 2402 } 2403 } 2404 } 2405 } 2406 } 2407 } 2408 } 2409 2410 // Visitor for when we visit a root. 2411 RootVisitor& visitor_; 2412}; 2413 2414class RootCallbackVisitor { 2415 public: 2416 RootCallbackVisitor(RootVisitor* visitor, uint32_t tid) : visitor_(visitor), tid_(tid) {} 2417 2418 void operator()(mirror::Object** obj, size_t vreg, const StackVisitor* stack_visitor) const 2419 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2420 visitor_->VisitRoot(obj, JavaFrameRootInfo(tid_, stack_visitor, vreg)); 2421 } 2422 2423 private: 2424 RootVisitor* const visitor_; 2425 const uint32_t tid_; 2426}; 2427 2428void Thread::VisitRoots(RootVisitor* visitor) { 2429 const uint32_t thread_id = GetThreadId(); 2430 visitor->VisitRootIfNonNull(&tlsPtr_.opeer, RootInfo(kRootThreadObject, thread_id)); 2431 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2432 visitor->VisitRoot(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), 2433 RootInfo(kRootNativeStack, thread_id)); 2434 } 2435 visitor->VisitRootIfNonNull(&tlsPtr_.monitor_enter_object, RootInfo(kRootNativeStack, thread_id)); 2436 tlsPtr_.jni_env->locals.VisitRoots(visitor, RootInfo(kRootJNILocal, thread_id)); 2437 tlsPtr_.jni_env->monitors.VisitRoots(visitor, RootInfo(kRootJNIMonitor, thread_id)); 2438 HandleScopeVisitRoots(visitor, thread_id); 2439 if (tlsPtr_.debug_invoke_req != nullptr) { 2440 tlsPtr_.debug_invoke_req->VisitRoots(visitor, RootInfo(kRootDebugger, thread_id)); 2441 } 2442 if (tlsPtr_.stacked_shadow_frame_record != nullptr) { 2443 RootCallbackVisitor visitor_to_callback(visitor, thread_id); 2444 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitor_to_callback); 2445 for (StackedShadowFrameRecord* record = tlsPtr_.stacked_shadow_frame_record; 2446 record != nullptr; 2447 record = record->GetLink()) { 2448 for (ShadowFrame* shadow_frame = record->GetShadowFrame(); 2449 shadow_frame != nullptr; 2450 shadow_frame = shadow_frame->GetLink()) { 2451 mapper.VisitShadowFrame(shadow_frame); 2452 } 2453 } 2454 } 2455 if (tlsPtr_.deoptimization_return_value_stack != nullptr) { 2456 for (DeoptimizationReturnValueRecord* record = tlsPtr_.deoptimization_return_value_stack; 2457 record != nullptr; 2458 record = record->GetLink()) { 2459 if (record->IsReference()) { 2460 visitor->VisitRootIfNonNull(record->GetGCRoot(), 2461 RootInfo(kRootThreadObject, thread_id)); 2462 } 2463 } 2464 } 2465 for (auto* verifier = tlsPtr_.method_verifier; verifier != nullptr; verifier = verifier->link_) { 2466 verifier->VisitRoots(visitor, RootInfo(kRootNativeStack, thread_id)); 2467 } 2468 // Visit roots on this thread's stack 2469 Context* context = GetLongJumpContext(); 2470 RootCallbackVisitor visitor_to_callback(visitor, thread_id); 2471 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitor_to_callback); 2472 mapper.WalkStack(); 2473 ReleaseLongJumpContext(context); 2474 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2475 visitor->VisitRootIfNonNull(&frame.this_object_, RootInfo(kRootVMInternal, thread_id)); 2476 } 2477} 2478 2479class VerifyRootVisitor : public SingleRootVisitor { 2480 public: 2481 void VisitRoot(mirror::Object* root, const RootInfo& info ATTRIBUTE_UNUSED) 2482 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2483 VerifyObject(root); 2484 } 2485}; 2486 2487void Thread::VerifyStackImpl() { 2488 VerifyRootVisitor visitor; 2489 std::unique_ptr<Context> context(Context::Create()); 2490 RootCallbackVisitor visitor_to_callback(&visitor, GetThreadId()); 2491 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitor_to_callback); 2492 mapper.WalkStack(); 2493} 2494 2495// Set the stack end to that to be used during a stack overflow 2496void Thread::SetStackEndForStackOverflow() { 2497 // During stack overflow we allow use of the full stack. 2498 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2499 // However, we seem to have already extended to use the full stack. 2500 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2501 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2502 DumpStack(LOG(ERROR)); 2503 LOG(FATAL) << "Recursive stack overflow."; 2504 } 2505 2506 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2507 2508 // Remove the stack overflow protection if is it set up. 2509 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2510 if (implicit_stack_check) { 2511 if (!UnprotectStack()) { 2512 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2513 } 2514 } 2515} 2516 2517void Thread::SetTlab(uint8_t* start, uint8_t* end) { 2518 DCHECK_LE(start, end); 2519 tlsPtr_.thread_local_start = start; 2520 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2521 tlsPtr_.thread_local_end = end; 2522 tlsPtr_.thread_local_objects = 0; 2523} 2524 2525bool Thread::HasTlab() const { 2526 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2527 if (has_tlab) { 2528 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2529 } else { 2530 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2531 } 2532 return has_tlab; 2533} 2534 2535std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2536 thread.ShortDump(os); 2537 return os; 2538} 2539 2540void Thread::ProtectStack() { 2541 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2542 VLOG(threads) << "Protecting stack at " << pregion; 2543 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2544 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2545 "Reason: " 2546 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2547 } 2548} 2549 2550bool Thread::UnprotectStack() { 2551 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2552 VLOG(threads) << "Unprotecting stack at " << pregion; 2553 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2554} 2555 2556void Thread::ActivateSingleStepControl(SingleStepControl* ssc) { 2557 CHECK(Dbg::IsDebuggerActive()); 2558 CHECK(GetSingleStepControl() == nullptr) << "Single step already active in thread " << *this; 2559 CHECK(ssc != nullptr); 2560 tlsPtr_.single_step_control = ssc; 2561} 2562 2563void Thread::DeactivateSingleStepControl() { 2564 CHECK(Dbg::IsDebuggerActive()); 2565 CHECK(GetSingleStepControl() != nullptr) << "Single step not active in thread " << *this; 2566 SingleStepControl* ssc = GetSingleStepControl(); 2567 tlsPtr_.single_step_control = nullptr; 2568 delete ssc; 2569} 2570 2571void Thread::SetDebugInvokeReq(DebugInvokeReq* req) { 2572 CHECK(Dbg::IsDebuggerActive()); 2573 CHECK(GetInvokeReq() == nullptr) << "Debug invoke req already active in thread " << *this; 2574 CHECK(Thread::Current() != this) << "Debug invoke can't be dispatched by the thread itself"; 2575 CHECK(req != nullptr); 2576 tlsPtr_.debug_invoke_req = req; 2577} 2578 2579void Thread::ClearDebugInvokeReq() { 2580 CHECK(GetInvokeReq() != nullptr) << "Debug invoke req not active in thread " << *this; 2581 CHECK(Thread::Current() == this) << "Debug invoke must be finished by the thread itself"; 2582 DebugInvokeReq* req = tlsPtr_.debug_invoke_req; 2583 tlsPtr_.debug_invoke_req = nullptr; 2584 delete req; 2585} 2586 2587void Thread::PushVerifier(verifier::MethodVerifier* verifier) { 2588 verifier->link_ = tlsPtr_.method_verifier; 2589 tlsPtr_.method_verifier = verifier; 2590} 2591 2592void Thread::PopVerifier(verifier::MethodVerifier* verifier) { 2593 CHECK_EQ(tlsPtr_.method_verifier, verifier); 2594 tlsPtr_.method_verifier = verifier->link_; 2595} 2596 2597} // namespace art 2598