thread.cc revision 5662383511a550e428bcdee0cc1be28e464ceed4
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; 391 392 if (VLOG_IS_ON(threads)) { 393 ScopedObjectAccess soa(env); 394 395 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 396 mirror::String* java_name = reinterpret_cast<mirror::String*>(f->GetObject( 397 soa.Decode<mirror::Object*>(java_peer))); 398 std::string thread_name; 399 if (java_name != nullptr) { 400 thread_name = java_name->ToModifiedUtf8(); 401 } else { 402 thread_name = "(Unnamed)"; 403 } 404 405 VLOG(threads) << "Creating native thread for " << thread_name; 406 self->Dump(LOG(INFO)); 407 } 408 409 Runtime* runtime = Runtime::Current(); 410 411 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 412 bool thread_start_during_shutdown = false; 413 { 414 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 415 if (runtime->IsShuttingDownLocked()) { 416 thread_start_during_shutdown = true; 417 } else { 418 runtime->StartThreadBirth(); 419 } 420 } 421 if (thread_start_during_shutdown) { 422 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 423 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 424 return; 425 } 426 427 Thread* child_thread = new Thread(is_daemon); 428 // Use global JNI ref to hold peer live while child thread starts. 429 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 430 stack_size = FixStackSize(stack_size); 431 432 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 433 // assign it. 434 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 435 reinterpret_cast<jlong>(child_thread)); 436 437 // Try to allocate a JNIEnvExt for the thread. We do this here as we might be out of memory and 438 // do not have a good way to report this on the child's side. 439 std::unique_ptr<JNIEnvExt> child_jni_env_ext( 440 JNIEnvExt::Create(child_thread, Runtime::Current()->GetJavaVM())); 441 442 int pthread_create_result = 0; 443 if (child_jni_env_ext.get() != nullptr) { 444 pthread_t new_pthread; 445 pthread_attr_t attr; 446 child_thread->tlsPtr_.tmp_jni_env = child_jni_env_ext.get(); 447 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 448 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), 449 "PTHREAD_CREATE_DETACHED"); 450 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 451 pthread_create_result = pthread_create(&new_pthread, 452 &attr, 453 Thread::CreateCallback, 454 child_thread); 455 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 456 457 if (pthread_create_result == 0) { 458 // pthread_create started the new thread. The child is now responsible for managing the 459 // JNIEnvExt we created. 460 // Note: we can't check for tmp_jni_env == nullptr, as that would require synchronization 461 // between the threads. 462 child_jni_env_ext.release(); 463 return; 464 } 465 } 466 467 // Either JNIEnvExt::Create or pthread_create(3) failed, so clean up. 468 { 469 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 470 runtime->EndThreadBirth(); 471 } 472 // Manually delete the global reference since Thread::Init will not have been run. 473 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 474 child_thread->tlsPtr_.jpeer = nullptr; 475 delete child_thread; 476 child_thread = nullptr; 477 // TODO: remove from thread group? 478 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 479 { 480 std::string msg(child_jni_env_ext.get() == nullptr ? 481 "Could not allocate JNI Env" : 482 StringPrintf("pthread_create (%s stack) failed: %s", 483 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 484 ScopedObjectAccess soa(env); 485 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 486 } 487} 488 489bool Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm, JNIEnvExt* jni_env_ext) { 490 // This function does all the initialization that must be run by the native thread it applies to. 491 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 492 // we can handshake with the corresponding native thread when it's ready.) Check this native 493 // thread hasn't been through here already... 494 CHECK(Thread::Current() == nullptr); 495 496 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 497 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 498 tlsPtr_.pthread_self = pthread_self(); 499 CHECK(is_started_); 500 501 SetUpAlternateSignalStack(); 502 if (!InitStackHwm()) { 503 return false; 504 } 505 InitCpu(); 506 InitTlsEntryPoints(); 507 RemoveSuspendTrigger(); 508 InitCardTable(); 509 InitTid(); 510 511 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 512 DCHECK_EQ(Thread::Current(), this); 513 514 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 515 516 if (jni_env_ext != nullptr) { 517 DCHECK_EQ(jni_env_ext->vm, java_vm); 518 DCHECK_EQ(jni_env_ext->self, this); 519 tlsPtr_.jni_env = jni_env_ext; 520 } else { 521 tlsPtr_.jni_env = JNIEnvExt::Create(this, java_vm); 522 if (tlsPtr_.jni_env == nullptr) { 523 return false; 524 } 525 } 526 527 thread_list->Register(this); 528 return true; 529} 530 531Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 532 bool create_peer) { 533 Runtime* runtime = Runtime::Current(); 534 if (runtime == nullptr) { 535 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 536 return nullptr; 537 } 538 Thread* self; 539 { 540 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 541 if (runtime->IsShuttingDownLocked()) { 542 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 543 return nullptr; 544 } else { 545 Runtime::Current()->StartThreadBirth(); 546 self = new Thread(as_daemon); 547 bool init_success = self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 548 Runtime::Current()->EndThreadBirth(); 549 if (!init_success) { 550 delete self; 551 return nullptr; 552 } 553 } 554 } 555 556 self->InitStringEntryPoints(); 557 558 CHECK_NE(self->GetState(), kRunnable); 559 self->SetState(kNative); 560 561 // If we're the main thread, ClassLinker won't be created until after we're attached, 562 // so that thread needs a two-stage attach. Regular threads don't need this hack. 563 // In the compiler, all threads need this hack, because no-one's going to be getting 564 // a native peer! 565 if (create_peer) { 566 self->CreatePeer(thread_name, as_daemon, thread_group); 567 } else { 568 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 569 if (thread_name != nullptr) { 570 self->tlsPtr_.name->assign(thread_name); 571 ::art::SetThreadName(thread_name); 572 } else if (self->GetJniEnv()->check_jni) { 573 LOG(WARNING) << *Thread::Current() << " attached without supplying a name"; 574 } 575 } 576 577 if (VLOG_IS_ON(threads)) { 578 if (thread_name != nullptr) { 579 VLOG(threads) << "Attaching thread " << thread_name; 580 } else { 581 VLOG(threads) << "Attaching unnamed thread."; 582 } 583 ScopedObjectAccess soa(self); 584 self->Dump(LOG(INFO)); 585 } 586 587 { 588 ScopedObjectAccess soa(self); 589 Dbg::PostThreadStart(self); 590 } 591 592 return self; 593} 594 595void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 596 Runtime* runtime = Runtime::Current(); 597 CHECK(runtime->IsStarted()); 598 JNIEnv* env = tlsPtr_.jni_env; 599 600 if (thread_group == nullptr) { 601 thread_group = runtime->GetMainThreadGroup(); 602 } 603 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 604 // Add missing null check in case of OOM b/18297817 605 if (name != nullptr && thread_name.get() == nullptr) { 606 CHECK(IsExceptionPending()); 607 return; 608 } 609 jint thread_priority = GetNativePriority(); 610 jboolean thread_is_daemon = as_daemon; 611 612 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 613 if (peer.get() == nullptr) { 614 CHECK(IsExceptionPending()); 615 return; 616 } 617 { 618 ScopedObjectAccess soa(this); 619 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 620 } 621 env->CallNonvirtualVoidMethod(peer.get(), 622 WellKnownClasses::java_lang_Thread, 623 WellKnownClasses::java_lang_Thread_init, 624 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 625 AssertNoPendingException(); 626 627 Thread* self = this; 628 DCHECK_EQ(self, Thread::Current()); 629 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 630 reinterpret_cast<jlong>(self)); 631 632 ScopedObjectAccess soa(self); 633 StackHandleScope<1> hs(self); 634 MutableHandle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 635 if (peer_thread_name.Get() == nullptr) { 636 // The Thread constructor should have set the Thread.name to a 637 // non-null value. However, because we can run without code 638 // available (in the compiler, in tests), we manually assign the 639 // fields the constructor should have set. 640 if (runtime->IsActiveTransaction()) { 641 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 642 } else { 643 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 644 } 645 peer_thread_name.Assign(GetThreadName(soa)); 646 } 647 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 648 if (peer_thread_name.Get() != nullptr) { 649 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 650 } 651} 652 653template<bool kTransactionActive> 654void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 655 jobject thread_name, jint thread_priority) { 656 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 657 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 658 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 659 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 660 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 661 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 662 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 663 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 664} 665 666void Thread::SetThreadName(const char* name) { 667 tlsPtr_.name->assign(name); 668 ::art::SetThreadName(name); 669 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 670} 671 672bool Thread::InitStackHwm() { 673 void* read_stack_base; 674 size_t read_stack_size; 675 size_t read_guard_size; 676 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size, &read_guard_size); 677 678 tlsPtr_.stack_begin = reinterpret_cast<uint8_t*>(read_stack_base); 679 tlsPtr_.stack_size = read_stack_size; 680 681 // The minimum stack size we can cope with is the overflow reserved bytes (typically 682 // 8K) + the protected region size (4K) + another page (4K). Typically this will 683 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 684 // between 8K and 12K. 685 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 686 + 4 * KB; 687 if (read_stack_size <= min_stack) { 688 // Note, as we know the stack is small, avoid operations that could use a lot of stack. 689 LogMessage::LogLineLowStack(__PRETTY_FUNCTION__, __LINE__, ERROR, 690 "Attempt to attach a thread with a too-small stack"); 691 return false; 692 } 693 694 // This is included in the SIGQUIT output, but it's useful here for thread debugging. 695 VLOG(threads) << StringPrintf("Native stack is at %p (%s with %s guard)", 696 read_stack_base, 697 PrettySize(read_stack_size).c_str(), 698 PrettySize(read_guard_size).c_str()); 699 700 // Set stack_end_ to the bottom of the stack saving space of stack overflows 701 702 Runtime* runtime = Runtime::Current(); 703 bool implicit_stack_check = !runtime->ExplicitStackOverflowChecks() && !runtime->IsAotCompiler(); 704 ResetDefaultStackEnd(); 705 706 // Install the protected region if we are doing implicit overflow checks. 707 if (implicit_stack_check) { 708 // The thread might have protected region at the bottom. We need 709 // to install our own region so we need to move the limits 710 // of the stack to make room for it. 711 712 tlsPtr_.stack_begin += read_guard_size + kStackOverflowProtectedSize; 713 tlsPtr_.stack_end += read_guard_size + kStackOverflowProtectedSize; 714 tlsPtr_.stack_size -= read_guard_size; 715 716 InstallImplicitProtection(); 717 } 718 719 // Sanity check. 720 int stack_variable; 721 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 722 723 return true; 724} 725 726void Thread::ShortDump(std::ostream& os) const { 727 os << "Thread["; 728 if (GetThreadId() != 0) { 729 // If we're in kStarting, we won't have a thin lock id or tid yet. 730 os << GetThreadId() 731 << ",tid=" << GetTid() << ','; 732 } 733 os << GetState() 734 << ",Thread*=" << this 735 << ",peer=" << tlsPtr_.opeer 736 << ",\"" << (tlsPtr_.name != nullptr ? *tlsPtr_.name : "null") << "\"" 737 << "]"; 738} 739 740void Thread::Dump(std::ostream& os) const { 741 DumpState(os); 742 DumpStack(os); 743} 744 745mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 746 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 747 return (tlsPtr_.opeer != nullptr) ? 748 reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 749} 750 751void Thread::GetThreadName(std::string& name) const { 752 name.assign(*tlsPtr_.name); 753} 754 755uint64_t Thread::GetCpuMicroTime() const { 756#if defined(__linux__) 757 clockid_t cpu_clock_id; 758 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 759 timespec now; 760 clock_gettime(cpu_clock_id, &now); 761 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 762#else // __APPLE__ 763 UNIMPLEMENTED(WARNING); 764 return -1; 765#endif 766} 767 768// Attempt to rectify locks so that we dump thread list with required locks before exiting. 769static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 770 LOG(ERROR) << *thread << " suspend count already zero."; 771 Locks::thread_suspend_count_lock_->Unlock(self); 772 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 773 Locks::mutator_lock_->SharedTryLock(self); 774 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 775 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 776 } 777 } 778 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 779 Locks::thread_list_lock_->TryLock(self); 780 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 781 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 782 } 783 } 784 std::ostringstream ss; 785 Runtime::Current()->GetThreadList()->Dump(ss); 786 LOG(FATAL) << ss.str(); 787} 788 789void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 790 if (kIsDebugBuild) { 791 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 792 << delta << " " << tls32_.debug_suspend_count << " " << this; 793 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 794 Locks::thread_suspend_count_lock_->AssertHeld(self); 795 if (this != self && !IsSuspended()) { 796 Locks::thread_list_lock_->AssertHeld(self); 797 } 798 } 799 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 800 UnsafeLogFatalForSuspendCount(self, this); 801 return; 802 } 803 804 tls32_.suspend_count += delta; 805 if (for_debugger) { 806 tls32_.debug_suspend_count += delta; 807 } 808 809 if (tls32_.suspend_count == 0) { 810 AtomicClearFlag(kSuspendRequest); 811 } else { 812 AtomicSetFlag(kSuspendRequest); 813 TriggerSuspend(); 814 } 815} 816 817void Thread::RunCheckpointFunction() { 818 Closure *checkpoints[kMaxCheckpoints]; 819 820 // Grab the suspend_count lock and copy the current set of 821 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 822 // function will also grab this lock so we prevent a race between setting 823 // the kCheckpointRequest flag and clearing it. 824 { 825 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 826 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 827 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 828 tlsPtr_.checkpoint_functions[i] = nullptr; 829 } 830 AtomicClearFlag(kCheckpointRequest); 831 } 832 833 // Outside the lock, run all the checkpoint functions that 834 // we collected. 835 bool found_checkpoint = false; 836 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 837 if (checkpoints[i] != nullptr) { 838 ATRACE_BEGIN("Checkpoint function"); 839 checkpoints[i]->Run(this); 840 ATRACE_END(); 841 found_checkpoint = true; 842 } 843 } 844 CHECK(found_checkpoint); 845} 846 847bool Thread::RequestCheckpoint(Closure* function) { 848 union StateAndFlags old_state_and_flags; 849 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 850 if (old_state_and_flags.as_struct.state != kRunnable) { 851 return false; // Fail, thread is suspended and so can't run a checkpoint. 852 } 853 854 uint32_t available_checkpoint = kMaxCheckpoints; 855 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 856 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 857 available_checkpoint = i; 858 break; 859 } 860 } 861 if (available_checkpoint == kMaxCheckpoints) { 862 // No checkpoint functions available, we can't run a checkpoint 863 return false; 864 } 865 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 866 867 // Checkpoint function installed now install flag bit. 868 // We must be runnable to request a checkpoint. 869 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 870 union StateAndFlags new_state_and_flags; 871 new_state_and_flags.as_int = old_state_and_flags.as_int; 872 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 873 bool success = tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent( 874 old_state_and_flags.as_int, new_state_and_flags.as_int); 875 if (UNLIKELY(!success)) { 876 // The thread changed state before the checkpoint was installed. 877 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 878 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 879 } else { 880 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 881 TriggerSuspend(); 882 } 883 return success; 884} 885 886Closure* Thread::GetFlipFunction() { 887 Atomic<Closure*>* atomic_func = reinterpret_cast<Atomic<Closure*>*>(&tlsPtr_.flip_function); 888 Closure* func; 889 do { 890 func = atomic_func->LoadRelaxed(); 891 if (func == nullptr) { 892 return nullptr; 893 } 894 } while (!atomic_func->CompareExchangeWeakSequentiallyConsistent(func, nullptr)); 895 DCHECK(func != nullptr); 896 return func; 897} 898 899void Thread::SetFlipFunction(Closure* function) { 900 CHECK(function != nullptr); 901 Atomic<Closure*>* atomic_func = reinterpret_cast<Atomic<Closure*>*>(&tlsPtr_.flip_function); 902 atomic_func->StoreSequentiallyConsistent(function); 903} 904 905void Thread::FullSuspendCheck() { 906 VLOG(threads) << this << " self-suspending"; 907 ATRACE_BEGIN("Full suspend check"); 908 // Make thread appear suspended to other threads, release mutator_lock_. 909 tls32_.suspended_at_suspend_check = true; 910 TransitionFromRunnableToSuspended(kSuspended); 911 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 912 TransitionFromSuspendedToRunnable(); 913 tls32_.suspended_at_suspend_check = false; 914 ATRACE_END(); 915 VLOG(threads) << this << " self-reviving"; 916} 917 918void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 919 std::string group_name; 920 int priority; 921 bool is_daemon = false; 922 Thread* self = Thread::Current(); 923 924 // If flip_function is not null, it means we have run a checkpoint 925 // before the thread wakes up to execute the flip function and the 926 // thread roots haven't been forwarded. So the following access to 927 // the roots (opeer or methods in the frames) would be bad. Run it 928 // here. TODO: clean up. 929 if (thread != nullptr) { 930 ScopedObjectAccessUnchecked soa(self); 931 Thread* this_thread = const_cast<Thread*>(thread); 932 Closure* flip_func = this_thread->GetFlipFunction(); 933 if (flip_func != nullptr) { 934 flip_func->Run(this_thread); 935 } 936 } 937 938 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 939 // cause ScopedObjectAccessUnchecked to deadlock. 940 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 941 ScopedObjectAccessUnchecked soa(self); 942 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 943 ->GetInt(thread->tlsPtr_.opeer); 944 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 945 ->GetBoolean(thread->tlsPtr_.opeer); 946 947 mirror::Object* thread_group = 948 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 949 950 if (thread_group != nullptr) { 951 ArtField* group_name_field = 952 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 953 mirror::String* group_name_string = 954 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 955 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 956 } 957 } else { 958 priority = GetNativePriority(); 959 } 960 961 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 962 if (scheduler_group_name.empty()) { 963 scheduler_group_name = "default"; 964 } 965 966 if (thread != nullptr) { 967 os << '"' << *thread->tlsPtr_.name << '"'; 968 if (is_daemon) { 969 os << " daemon"; 970 } 971 os << " prio=" << priority 972 << " tid=" << thread->GetThreadId() 973 << " " << thread->GetState(); 974 if (thread->IsStillStarting()) { 975 os << " (still starting up)"; 976 } 977 os << "\n"; 978 } else { 979 os << '"' << ::art::GetThreadName(tid) << '"' 980 << " prio=" << priority 981 << " (not attached)\n"; 982 } 983 984 if (thread != nullptr) { 985 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 986 os << " | group=\"" << group_name << "\"" 987 << " sCount=" << thread->tls32_.suspend_count 988 << " dsCount=" << thread->tls32_.debug_suspend_count 989 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 990 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 991 } 992 993 os << " | sysTid=" << tid 994 << " nice=" << getpriority(PRIO_PROCESS, tid) 995 << " cgrp=" << scheduler_group_name; 996 if (thread != nullptr) { 997 int policy; 998 sched_param sp; 999 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 1000 __FUNCTION__); 1001 os << " sched=" << policy << "/" << sp.sched_priority 1002 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 1003 } 1004 os << "\n"; 1005 1006 // Grab the scheduler stats for this thread. 1007 std::string scheduler_stats; 1008 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 1009 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 1010 } else { 1011 scheduler_stats = "0 0 0"; 1012 } 1013 1014 char native_thread_state = '?'; 1015 int utime = 0; 1016 int stime = 0; 1017 int task_cpu = 0; 1018 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 1019 1020 os << " | state=" << native_thread_state 1021 << " schedstat=( " << scheduler_stats << " )" 1022 << " utm=" << utime 1023 << " stm=" << stime 1024 << " core=" << task_cpu 1025 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 1026 if (thread != nullptr) { 1027 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 1028 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 1029 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 1030 // Dump the held mutexes. 1031 os << " | held mutexes="; 1032 for (size_t i = 0; i < kLockLevelCount; ++i) { 1033 if (i != kMonitorLock) { 1034 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 1035 if (mutex != nullptr) { 1036 os << " \"" << mutex->GetName() << "\""; 1037 if (mutex->IsReaderWriterMutex()) { 1038 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 1039 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 1040 os << "(exclusive held)"; 1041 } else { 1042 os << "(shared held)"; 1043 } 1044 } 1045 } 1046 } 1047 } 1048 os << "\n"; 1049 } 1050} 1051 1052void Thread::DumpState(std::ostream& os) const { 1053 Thread::DumpState(os, this, GetTid()); 1054} 1055 1056struct StackDumpVisitor : public StackVisitor { 1057 StackDumpVisitor(std::ostream& os_in, Thread* thread_in, Context* context, bool can_allocate_in) 1058 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1059 : StackVisitor(thread_in, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1060 os(os_in), 1061 thread(thread_in), 1062 can_allocate(can_allocate_in), 1063 last_method(nullptr), 1064 last_line_number(0), 1065 repetition_count(0), 1066 frame_count(0) {} 1067 1068 virtual ~StackDumpVisitor() { 1069 if (frame_count == 0) { 1070 os << " (no managed stack frames)\n"; 1071 } 1072 } 1073 1074 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1075 ArtMethod* m = GetMethod(); 1076 if (m->IsRuntimeMethod()) { 1077 return true; 1078 } 1079 const int kMaxRepetition = 3; 1080 mirror::Class* c = m->GetDeclaringClass(); 1081 mirror::DexCache* dex_cache = c->GetDexCache(); 1082 int line_number = -1; 1083 if (dex_cache != nullptr) { // be tolerant of bad input 1084 const DexFile& dex_file = *dex_cache->GetDexFile(); 1085 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 1086 } 1087 if (line_number == last_line_number && last_method == m) { 1088 ++repetition_count; 1089 } else { 1090 if (repetition_count >= kMaxRepetition) { 1091 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 1092 } 1093 repetition_count = 0; 1094 last_line_number = line_number; 1095 last_method = m; 1096 } 1097 if (repetition_count < kMaxRepetition) { 1098 os << " at " << PrettyMethod(m, false); 1099 if (m->IsNative()) { 1100 os << "(Native method)"; 1101 } else { 1102 const char* source_file(m->GetDeclaringClassSourceFile()); 1103 os << "(" << (source_file != nullptr ? source_file : "unavailable") 1104 << ":" << line_number << ")"; 1105 } 1106 os << "\n"; 1107 if (frame_count == 0) { 1108 Monitor::DescribeWait(os, thread); 1109 } 1110 if (can_allocate) { 1111 // Visit locks, but do not abort on errors. This would trigger a nested abort. 1112 Monitor::VisitLocks(this, DumpLockedObject, &os, false); 1113 } 1114 } 1115 1116 ++frame_count; 1117 return true; 1118 } 1119 1120 static void DumpLockedObject(mirror::Object* o, void* context) 1121 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1122 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 1123 os << " - locked "; 1124 if (o == nullptr) { 1125 os << "an unknown object"; 1126 } else { 1127 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 1128 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 1129 // Getting the identity hashcode here would result in lock inflation and suspension of the 1130 // current thread, which isn't safe if this is the only runnable thread. 1131 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 1132 PrettyTypeOf(o).c_str()); 1133 } else { 1134 // IdentityHashCode can cause thread suspension, which would invalidate o if it moved. So 1135 // we get the pretty type beofre we call IdentityHashCode. 1136 const std::string pretty_type(PrettyTypeOf(o)); 1137 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), pretty_type.c_str()); 1138 } 1139 } 1140 os << "\n"; 1141 } 1142 1143 std::ostream& os; 1144 const Thread* thread; 1145 const bool can_allocate; 1146 ArtMethod* last_method; 1147 int last_line_number; 1148 int repetition_count; 1149 int frame_count; 1150}; 1151 1152static bool ShouldShowNativeStack(const Thread* thread) 1153 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1154 ThreadState state = thread->GetState(); 1155 1156 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 1157 if (state > kWaiting && state < kStarting) { 1158 return true; 1159 } 1160 1161 // In an Object.wait variant or Thread.sleep? That's not interesting. 1162 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 1163 return false; 1164 } 1165 1166 // Threads with no managed stack frames should be shown. 1167 const ManagedStack* managed_stack = thread->GetManagedStack(); 1168 if (managed_stack == nullptr || (managed_stack->GetTopQuickFrame() == nullptr && 1169 managed_stack->GetTopShadowFrame() == nullptr)) { 1170 return true; 1171 } 1172 1173 // In some other native method? That's interesting. 1174 // We don't just check kNative because native methods will be in state kSuspended if they're 1175 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 1176 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 1177 ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 1178 return current_method != nullptr && current_method->IsNative(); 1179} 1180 1181void Thread::DumpJavaStack(std::ostream& os) const { 1182 // If flip_function is not null, it means we have run a checkpoint 1183 // before the thread wakes up to execute the flip function and the 1184 // thread roots haven't been forwarded. So the following access to 1185 // the roots (locks or methods in the frames) would be bad. Run it 1186 // here. TODO: clean up. 1187 { 1188 Thread* this_thread = const_cast<Thread*>(this); 1189 Closure* flip_func = this_thread->GetFlipFunction(); 1190 if (flip_func != nullptr) { 1191 flip_func->Run(this_thread); 1192 } 1193 } 1194 1195 // Dumping the Java stack involves the verifier for locks. The verifier operates under the 1196 // assumption that there is no exception pending on entry. Thus, stash any pending exception. 1197 // Thread::Current() instead of this in case a thread is dumping the stack of another suspended 1198 // thread. 1199 StackHandleScope<1> scope(Thread::Current()); 1200 Handle<mirror::Throwable> exc; 1201 bool have_exception = false; 1202 if (IsExceptionPending()) { 1203 exc = scope.NewHandle(GetException()); 1204 const_cast<Thread*>(this)->ClearException(); 1205 have_exception = true; 1206 } 1207 1208 std::unique_ptr<Context> context(Context::Create()); 1209 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 1210 !tls32_.throwing_OutOfMemoryError); 1211 dumper.WalkStack(); 1212 1213 if (have_exception) { 1214 const_cast<Thread*>(this)->SetException(exc.Get()); 1215 } 1216} 1217 1218void Thread::DumpStack(std::ostream& os) const { 1219 // TODO: we call this code when dying but may not have suspended the thread ourself. The 1220 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 1221 // the race with the thread_suspend_count_lock_). 1222 bool dump_for_abort = (gAborting > 0); 1223 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 1224 if (!kIsDebugBuild) { 1225 // We always want to dump the stack for an abort, however, there is no point dumping another 1226 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 1227 safe_to_dump = (safe_to_dump || dump_for_abort); 1228 } 1229 if (safe_to_dump) { 1230 // If we're currently in native code, dump that stack before dumping the managed stack. 1231 if (dump_for_abort || ShouldShowNativeStack(this)) { 1232 DumpKernelStack(os, GetTid(), " kernel: ", false); 1233 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr, !dump_for_abort)); 1234 } 1235 DumpJavaStack(os); 1236 } else { 1237 os << "Not able to dump stack of thread that isn't suspended"; 1238 } 1239} 1240 1241void Thread::ThreadExitCallback(void* arg) { 1242 Thread* self = reinterpret_cast<Thread*>(arg); 1243 if (self->tls32_.thread_exit_check_count == 0) { 1244 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1245 "going to use a pthread_key_create destructor?): " << *self; 1246 CHECK(is_started_); 1247 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1248 self->tls32_.thread_exit_check_count = 1; 1249 } else { 1250 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1251 } 1252} 1253 1254void Thread::Startup() { 1255 CHECK(!is_started_); 1256 is_started_ = true; 1257 { 1258 // MutexLock to keep annotalysis happy. 1259 // 1260 // Note we use null for the thread because Thread::Current can 1261 // return garbage since (is_started_ == true) and 1262 // Thread::pthread_key_self_ is not yet initialized. 1263 // This was seen on glibc. 1264 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1265 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1266 *Locks::thread_suspend_count_lock_); 1267 } 1268 1269 // Allocate a TLS slot. 1270 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), 1271 "self key"); 1272 1273 // Double-check the TLS slot allocation. 1274 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1275 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1276 } 1277} 1278 1279void Thread::FinishStartup() { 1280 Runtime* runtime = Runtime::Current(); 1281 CHECK(runtime->IsStarted()); 1282 1283 // Finish attaching the main thread. 1284 ScopedObjectAccess soa(Thread::Current()); 1285 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1286 1287 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1288} 1289 1290void Thread::Shutdown() { 1291 CHECK(is_started_); 1292 is_started_ = false; 1293 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1294 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1295 if (resume_cond_ != nullptr) { 1296 delete resume_cond_; 1297 resume_cond_ = nullptr; 1298 } 1299} 1300 1301Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1302 wait_mutex_ = new Mutex("a thread wait mutex"); 1303 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1304 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1305 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1306 tlsPtr_.nested_signal_state = static_cast<jmp_buf*>(malloc(sizeof(jmp_buf))); 1307 1308 static_assert((sizeof(Thread) % 4) == 0U, 1309 "art::Thread has a size which is not a multiple of 4."); 1310 tls32_.state_and_flags.as_struct.flags = 0; 1311 tls32_.state_and_flags.as_struct.state = kNative; 1312 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1313 std::fill(tlsPtr_.rosalloc_runs, 1314 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1315 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1316 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1317 tlsPtr_.checkpoint_functions[i] = nullptr; 1318 } 1319 tlsPtr_.flip_function = nullptr; 1320 tls32_.suspended_at_suspend_check = false; 1321} 1322 1323bool Thread::IsStillStarting() const { 1324 // You might think you can check whether the state is kStarting, but for much of thread startup, 1325 // the thread is in kNative; it might also be in kVmWait. 1326 // You might think you can check whether the peer is null, but the peer is actually created and 1327 // assigned fairly early on, and needs to be. 1328 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1329 // this thread _ever_ entered kRunnable". 1330 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1331 (*tlsPtr_.name == kThreadNameDuringStartup); 1332} 1333 1334void Thread::AssertPendingException() const { 1335 CHECK(IsExceptionPending()) << "Pending exception expected."; 1336} 1337 1338void Thread::AssertPendingOOMException() const { 1339 AssertPendingException(); 1340 auto* e = GetException(); 1341 CHECK_EQ(e->GetClass(), DecodeJObject(WellKnownClasses::java_lang_OutOfMemoryError)->AsClass()) 1342 << e->Dump(); 1343} 1344 1345void Thread::AssertNoPendingException() const { 1346 if (UNLIKELY(IsExceptionPending())) { 1347 ScopedObjectAccess soa(Thread::Current()); 1348 mirror::Throwable* exception = GetException(); 1349 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1350 } 1351} 1352 1353void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1354 if (UNLIKELY(IsExceptionPending())) { 1355 ScopedObjectAccess soa(Thread::Current()); 1356 mirror::Throwable* exception = GetException(); 1357 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1358 << exception->Dump(); 1359 } 1360} 1361 1362class MonitorExitVisitor : public SingleRootVisitor { 1363 public: 1364 explicit MonitorExitVisitor(Thread* self) : self_(self) { } 1365 1366 // NO_THREAD_SAFETY_ANALYSIS due to MonitorExit. 1367 void VisitRoot(mirror::Object* entered_monitor, const RootInfo& info ATTRIBUTE_UNUSED) 1368 OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 1369 if (self_->HoldsLock(entered_monitor)) { 1370 LOG(WARNING) << "Calling MonitorExit on object " 1371 << entered_monitor << " (" << PrettyTypeOf(entered_monitor) << ")" 1372 << " left locked by native thread " 1373 << *Thread::Current() << " which is detaching"; 1374 entered_monitor->MonitorExit(self_); 1375 } 1376 } 1377 1378 private: 1379 Thread* const self_; 1380}; 1381 1382void Thread::Destroy() { 1383 Thread* self = this; 1384 DCHECK_EQ(self, Thread::Current()); 1385 1386 if (tlsPtr_.jni_env != nullptr) { 1387 { 1388 ScopedObjectAccess soa(self); 1389 MonitorExitVisitor visitor(self); 1390 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1391 tlsPtr_.jni_env->monitors.VisitRoots(&visitor, RootInfo(kRootVMInternal)); 1392 } 1393 // Release locally held global references which releasing may require the mutator lock. 1394 if (tlsPtr_.jpeer != nullptr) { 1395 // If pthread_create fails we don't have a jni env here. 1396 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1397 tlsPtr_.jpeer = nullptr; 1398 } 1399 if (tlsPtr_.class_loader_override != nullptr) { 1400 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.class_loader_override); 1401 tlsPtr_.class_loader_override = nullptr; 1402 } 1403 } 1404 1405 if (tlsPtr_.opeer != nullptr) { 1406 ScopedObjectAccess soa(self); 1407 // We may need to call user-supplied managed code, do this before final clean-up. 1408 HandleUncaughtExceptions(soa); 1409 RemoveFromThreadGroup(soa); 1410 1411 // this.nativePeer = 0; 1412 if (Runtime::Current()->IsActiveTransaction()) { 1413 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1414 ->SetLong<true>(tlsPtr_.opeer, 0); 1415 } else { 1416 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1417 ->SetLong<false>(tlsPtr_.opeer, 0); 1418 } 1419 Dbg::PostThreadDeath(self); 1420 1421 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1422 // who is waiting. 1423 mirror::Object* lock = 1424 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1425 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1426 if (lock != nullptr) { 1427 StackHandleScope<1> hs(self); 1428 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1429 ObjectLock<mirror::Object> locker(self, h_obj); 1430 locker.NotifyAll(); 1431 } 1432 tlsPtr_.opeer = nullptr; 1433 } 1434 1435 { 1436 ScopedObjectAccess soa(self); 1437 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1438 } 1439} 1440 1441Thread::~Thread() { 1442 CHECK(tlsPtr_.class_loader_override == nullptr); 1443 CHECK(tlsPtr_.jpeer == nullptr); 1444 CHECK(tlsPtr_.opeer == nullptr); 1445 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1446 if (initialized) { 1447 delete tlsPtr_.jni_env; 1448 tlsPtr_.jni_env = nullptr; 1449 } 1450 CHECK_NE(GetState(), kRunnable); 1451 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1452 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1453 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1454 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1455 CHECK(tlsPtr_.flip_function == nullptr); 1456 CHECK_EQ(tls32_.suspended_at_suspend_check, false); 1457 1458 // We may be deleting a still born thread. 1459 SetStateUnsafe(kTerminated); 1460 1461 delete wait_cond_; 1462 delete wait_mutex_; 1463 1464 if (tlsPtr_.long_jump_context != nullptr) { 1465 delete tlsPtr_.long_jump_context; 1466 } 1467 1468 if (initialized) { 1469 CleanupCpu(); 1470 } 1471 1472 if (tlsPtr_.single_step_control != nullptr) { 1473 delete tlsPtr_.single_step_control; 1474 } 1475 delete tlsPtr_.instrumentation_stack; 1476 delete tlsPtr_.name; 1477 delete tlsPtr_.stack_trace_sample; 1478 free(tlsPtr_.nested_signal_state); 1479 1480 Runtime::Current()->GetHeap()->AssertThreadLocalBuffersAreRevoked(this); 1481 1482 TearDownAlternateSignalStack(); 1483} 1484 1485void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1486 if (!IsExceptionPending()) { 1487 return; 1488 } 1489 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1490 ScopedThreadStateChange tsc(this, kNative); 1491 1492 // Get and clear the exception. 1493 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1494 tlsPtr_.jni_env->ExceptionClear(); 1495 1496 // If the thread has its own handler, use that. 1497 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1498 tlsPtr_.jni_env->GetObjectField(peer.get(), 1499 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1500 if (handler.get() == nullptr) { 1501 // Otherwise use the thread group's default handler. 1502 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1503 WellKnownClasses::java_lang_Thread_group)); 1504 } 1505 1506 // Call the handler. 1507 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1508 WellKnownClasses::java_lang_Thread__UncaughtExceptionHandler_uncaughtException, 1509 peer.get(), exception.get()); 1510 1511 // If the handler threw, clear that exception too. 1512 tlsPtr_.jni_env->ExceptionClear(); 1513} 1514 1515void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1516 // this.group.removeThread(this); 1517 // group can be null if we're in the compiler or a test. 1518 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1519 ->GetObject(tlsPtr_.opeer); 1520 if (ogroup != nullptr) { 1521 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1522 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1523 ScopedThreadStateChange tsc(soa.Self(), kNative); 1524 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1525 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1526 peer.get()); 1527 } 1528} 1529 1530size_t Thread::NumHandleReferences() { 1531 size_t count = 0; 1532 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur != nullptr; cur = cur->GetLink()) { 1533 count += cur->NumberOfReferences(); 1534 } 1535 return count; 1536} 1537 1538bool Thread::HandleScopeContains(jobject obj) const { 1539 StackReference<mirror::Object>* hs_entry = 1540 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1541 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur!= nullptr; cur = cur->GetLink()) { 1542 if (cur->Contains(hs_entry)) { 1543 return true; 1544 } 1545 } 1546 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1547 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1548} 1549 1550void Thread::HandleScopeVisitRoots(RootVisitor* visitor, uint32_t thread_id) { 1551 BufferedRootVisitor<kDefaultBufferedRootCount> buffered_visitor( 1552 visitor, RootInfo(kRootNativeStack, thread_id)); 1553 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1554 for (size_t j = 0, count = cur->NumberOfReferences(); j < count; ++j) { 1555 // GetReference returns a pointer to the stack reference within the handle scope. If this 1556 // needs to be updated, it will be done by the root visitor. 1557 buffered_visitor.VisitRootIfNonNull(cur->GetHandle(j).GetReference()); 1558 } 1559 } 1560} 1561 1562mirror::Object* Thread::DecodeJObject(jobject obj) const { 1563 if (obj == nullptr) { 1564 return nullptr; 1565 } 1566 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1567 IndirectRefKind kind = GetIndirectRefKind(ref); 1568 mirror::Object* result; 1569 bool expect_null = false; 1570 // The "kinds" below are sorted by the frequency we expect to encounter them. 1571 if (kind == kLocal) { 1572 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1573 // Local references do not need a read barrier. 1574 result = locals.Get<kWithoutReadBarrier>(ref); 1575 } else if (kind == kHandleScopeOrInvalid) { 1576 // TODO: make stack indirect reference table lookup more efficient. 1577 // Check if this is a local reference in the handle scope. 1578 if (LIKELY(HandleScopeContains(obj))) { 1579 // Read from handle scope. 1580 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1581 VerifyObject(result); 1582 } else { 1583 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of invalid jobject %p", obj); 1584 expect_null = true; 1585 result = nullptr; 1586 } 1587 } else if (kind == kGlobal) { 1588 result = tlsPtr_.jni_env->vm->DecodeGlobal(const_cast<Thread*>(this), ref); 1589 } else { 1590 DCHECK_EQ(kind, kWeakGlobal); 1591 result = tlsPtr_.jni_env->vm->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1592 if (Runtime::Current()->IsClearedJniWeakGlobal(result)) { 1593 // This is a special case where it's okay to return null. 1594 expect_null = true; 1595 result = nullptr; 1596 } 1597 } 1598 1599 if (UNLIKELY(!expect_null && result == nullptr)) { 1600 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of deleted %s %p", 1601 ToStr<IndirectRefKind>(kind).c_str(), obj); 1602 } 1603 return result; 1604} 1605 1606// Implements java.lang.Thread.interrupted. 1607bool Thread::Interrupted() { 1608 MutexLock mu(Thread::Current(), *wait_mutex_); 1609 bool interrupted = IsInterruptedLocked(); 1610 SetInterruptedLocked(false); 1611 return interrupted; 1612} 1613 1614// Implements java.lang.Thread.isInterrupted. 1615bool Thread::IsInterrupted() { 1616 MutexLock mu(Thread::Current(), *wait_mutex_); 1617 return IsInterruptedLocked(); 1618} 1619 1620void Thread::Interrupt(Thread* self) { 1621 MutexLock mu(self, *wait_mutex_); 1622 if (interrupted_) { 1623 return; 1624 } 1625 interrupted_ = true; 1626 NotifyLocked(self); 1627} 1628 1629void Thread::Notify() { 1630 Thread* self = Thread::Current(); 1631 MutexLock mu(self, *wait_mutex_); 1632 NotifyLocked(self); 1633} 1634 1635void Thread::NotifyLocked(Thread* self) { 1636 if (wait_monitor_ != nullptr) { 1637 wait_cond_->Signal(self); 1638 } 1639} 1640 1641void Thread::SetClassLoaderOverride(jobject class_loader_override) { 1642 if (tlsPtr_.class_loader_override != nullptr) { 1643 GetJniEnv()->DeleteGlobalRef(tlsPtr_.class_loader_override); 1644 } 1645 tlsPtr_.class_loader_override = GetJniEnv()->NewGlobalRef(class_loader_override); 1646} 1647 1648class CountStackDepthVisitor : public StackVisitor { 1649 public: 1650 explicit CountStackDepthVisitor(Thread* thread) 1651 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1652 : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1653 depth_(0), skip_depth_(0), skipping_(true) {} 1654 1655 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1656 // We want to skip frames up to and including the exception's constructor. 1657 // Note we also skip the frame if it doesn't have a method (namely the callee 1658 // save frame) 1659 ArtMethod* m = GetMethod(); 1660 if (skipping_ && !m->IsRuntimeMethod() && 1661 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1662 skipping_ = false; 1663 } 1664 if (!skipping_) { 1665 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1666 ++depth_; 1667 } 1668 } else { 1669 ++skip_depth_; 1670 } 1671 return true; 1672 } 1673 1674 int GetDepth() const { 1675 return depth_; 1676 } 1677 1678 int GetSkipDepth() const { 1679 return skip_depth_; 1680 } 1681 1682 private: 1683 uint32_t depth_; 1684 uint32_t skip_depth_; 1685 bool skipping_; 1686}; 1687 1688template<bool kTransactionActive> 1689class BuildInternalStackTraceVisitor : public StackVisitor { 1690 public: 1691 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1692 : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1693 self_(self), 1694 skip_depth_(skip_depth), 1695 count_(0), 1696 trace_(nullptr), 1697 pointer_size_(Runtime::Current()->GetClassLinker()->GetImagePointerSize()) {} 1698 1699 bool Init(int depth) 1700 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1701 // Allocate method trace with format [method pointers][pcs]. 1702 auto* cl = Runtime::Current()->GetClassLinker(); 1703 trace_ = cl->AllocPointerArray(self_, depth * 2); 1704 if (trace_ == nullptr) { 1705 self_->AssertPendingOOMException(); 1706 return false; 1707 } 1708 // If We are called from native, use non-transactional mode. 1709 const char* last_no_suspend_cause = 1710 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1711 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1712 return true; 1713 } 1714 1715 virtual ~BuildInternalStackTraceVisitor() { 1716 if (trace_ != nullptr) { 1717 self_->EndAssertNoThreadSuspension(nullptr); 1718 } 1719 } 1720 1721 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1722 if (trace_ == nullptr) { 1723 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1724 } 1725 if (skip_depth_ > 0) { 1726 skip_depth_--; 1727 return true; 1728 } 1729 ArtMethod* m = GetMethod(); 1730 if (m->IsRuntimeMethod()) { 1731 return true; // Ignore runtime frames (in particular callee save). 1732 } 1733 trace_->SetElementPtrSize<kTransactionActive>( 1734 count_, m, pointer_size_); 1735 trace_->SetElementPtrSize<kTransactionActive>( 1736 trace_->GetLength() / 2 + count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc(), 1737 pointer_size_); 1738 ++count_; 1739 return true; 1740 } 1741 1742 mirror::PointerArray* GetInternalStackTrace() const { 1743 return trace_; 1744 } 1745 1746 private: 1747 Thread* const self_; 1748 // How many more frames to skip. 1749 int32_t skip_depth_; 1750 // Current position down stack trace. 1751 uint32_t count_; 1752 // An array of the methods on the stack, the last entries are the dex PCs. 1753 mirror::PointerArray* trace_; 1754 // For cross compilation. 1755 size_t pointer_size_; 1756}; 1757 1758template<bool kTransactionActive> 1759jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1760 // Compute depth of stack 1761 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1762 count_visitor.WalkStack(); 1763 int32_t depth = count_visitor.GetDepth(); 1764 int32_t skip_depth = count_visitor.GetSkipDepth(); 1765 1766 // Build internal stack trace. 1767 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1768 const_cast<Thread*>(this), 1769 skip_depth); 1770 if (!build_trace_visitor.Init(depth)) { 1771 return nullptr; // Allocation failed. 1772 } 1773 build_trace_visitor.WalkStack(); 1774 mirror::PointerArray* trace = build_trace_visitor.GetInternalStackTrace(); 1775 if (kIsDebugBuild) { 1776 // Second half is dex PCs. 1777 for (uint32_t i = 0; i < static_cast<uint32_t>(trace->GetLength() / 2); ++i) { 1778 auto* method = trace->GetElementPtrSize<ArtMethod*>( 1779 i, Runtime::Current()->GetClassLinker()->GetImagePointerSize()); 1780 CHECK(method != nullptr); 1781 } 1782 } 1783 return soa.AddLocalReference<jobject>(trace); 1784} 1785template jobject Thread::CreateInternalStackTrace<false>( 1786 const ScopedObjectAccessAlreadyRunnable& soa) const; 1787template jobject Thread::CreateInternalStackTrace<true>( 1788 const ScopedObjectAccessAlreadyRunnable& soa) const; 1789 1790bool Thread::IsExceptionThrownByCurrentMethod(mirror::Throwable* exception) const { 1791 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1792 count_visitor.WalkStack(); 1793 return count_visitor.GetDepth() == exception->GetStackDepth(); 1794} 1795 1796jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1797 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1798 int* stack_depth) { 1799 // Decode the internal stack trace into the depth, method trace and PC trace 1800 int32_t depth = soa.Decode<mirror::PointerArray*>(internal)->GetLength() / 2; 1801 1802 auto* cl = Runtime::Current()->GetClassLinker(); 1803 1804 jobjectArray result; 1805 1806 if (output_array != nullptr) { 1807 // Reuse the array we were given. 1808 result = output_array; 1809 // ...adjusting the number of frames we'll write to not exceed the array length. 1810 const int32_t traces_length = 1811 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1812 depth = std::min(depth, traces_length); 1813 } else { 1814 // Create java_trace array and place in local reference table 1815 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1816 cl->AllocStackTraceElementArray(soa.Self(), depth); 1817 if (java_traces == nullptr) { 1818 return nullptr; 1819 } 1820 result = soa.AddLocalReference<jobjectArray>(java_traces); 1821 } 1822 1823 if (stack_depth != nullptr) { 1824 *stack_depth = depth; 1825 } 1826 1827 for (int32_t i = 0; i < depth; ++i) { 1828 auto* method_trace = soa.Decode<mirror::PointerArray*>(internal); 1829 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1830 ArtMethod* method = method_trace->GetElementPtrSize<ArtMethod*>(i, sizeof(void*)); 1831 uint32_t dex_pc = method_trace->GetElementPtrSize<uint32_t>( 1832 i + method_trace->GetLength() / 2, sizeof(void*)); 1833 int32_t line_number; 1834 StackHandleScope<3> hs(soa.Self()); 1835 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1836 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1837 if (method->IsProxyMethod()) { 1838 line_number = -1; 1839 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1840 // source_name_object intentionally left null for proxy methods 1841 } else { 1842 line_number = method->GetLineNumFromDexPC(dex_pc); 1843 // Allocate element, potentially triggering GC 1844 // TODO: reuse class_name_object via Class::name_? 1845 const char* descriptor = method->GetDeclaringClassDescriptor(); 1846 CHECK(descriptor != nullptr); 1847 std::string class_name(PrettyDescriptor(descriptor)); 1848 class_name_object.Assign( 1849 mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1850 if (class_name_object.Get() == nullptr) { 1851 soa.Self()->AssertPendingOOMException(); 1852 return nullptr; 1853 } 1854 const char* source_file = method->GetDeclaringClassSourceFile(); 1855 if (source_file != nullptr) { 1856 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1857 if (source_name_object.Get() == nullptr) { 1858 soa.Self()->AssertPendingOOMException(); 1859 return nullptr; 1860 } 1861 } 1862 } 1863 const char* method_name = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetName(); 1864 CHECK(method_name != nullptr); 1865 Handle<mirror::String> method_name_object( 1866 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1867 if (method_name_object.Get() == nullptr) { 1868 return nullptr; 1869 } 1870 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1871 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1872 if (obj == nullptr) { 1873 return nullptr; 1874 } 1875 // We are called from native: use non-transactional mode. 1876 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1877 } 1878 return result; 1879} 1880 1881void Thread::ThrowNewExceptionF(const char* exception_class_descriptor, const char* fmt, ...) { 1882 va_list args; 1883 va_start(args, fmt); 1884 ThrowNewExceptionV(exception_class_descriptor, fmt, args); 1885 va_end(args); 1886} 1887 1888void Thread::ThrowNewExceptionV(const char* exception_class_descriptor, 1889 const char* fmt, va_list ap) { 1890 std::string msg; 1891 StringAppendV(&msg, fmt, ap); 1892 ThrowNewException(exception_class_descriptor, msg.c_str()); 1893} 1894 1895void Thread::ThrowNewException(const char* exception_class_descriptor, 1896 const char* msg) { 1897 // Callers should either clear or call ThrowNewWrappedException. 1898 AssertNoPendingExceptionForNewException(msg); 1899 ThrowNewWrappedException(exception_class_descriptor, msg); 1900} 1901 1902static mirror::ClassLoader* GetCurrentClassLoader(Thread* self) 1903 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1904 ArtMethod* method = self->GetCurrentMethod(nullptr); 1905 return method != nullptr 1906 ? method->GetDeclaringClass()->GetClassLoader() 1907 : nullptr; 1908} 1909 1910void Thread::ThrowNewWrappedException(const char* exception_class_descriptor, 1911 const char* msg) { 1912 DCHECK_EQ(this, Thread::Current()); 1913 ScopedObjectAccessUnchecked soa(this); 1914 StackHandleScope<3> hs(soa.Self()); 1915 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(GetCurrentClassLoader(soa.Self()))); 1916 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException())); 1917 ClearException(); 1918 Runtime* runtime = Runtime::Current(); 1919 auto* cl = runtime->GetClassLinker(); 1920 Handle<mirror::Class> exception_class( 1921 hs.NewHandle(cl->FindClass(this, exception_class_descriptor, class_loader))); 1922 if (UNLIKELY(exception_class.Get() == nullptr)) { 1923 CHECK(IsExceptionPending()); 1924 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1925 return; 1926 } 1927 1928 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(soa.Self(), exception_class, true, 1929 true))) { 1930 DCHECK(IsExceptionPending()); 1931 return; 1932 } 1933 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1934 Handle<mirror::Throwable> exception( 1935 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1936 1937 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1938 if (exception.Get() == nullptr) { 1939 SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1940 return; 1941 } 1942 1943 // Choose an appropriate constructor and set up the arguments. 1944 const char* signature; 1945 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1946 if (msg != nullptr) { 1947 // Ensure we remember this and the method over the String allocation. 1948 msg_string.reset( 1949 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1950 if (UNLIKELY(msg_string.get() == nullptr)) { 1951 CHECK(IsExceptionPending()); // OOME. 1952 return; 1953 } 1954 if (cause.get() == nullptr) { 1955 signature = "(Ljava/lang/String;)V"; 1956 } else { 1957 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1958 } 1959 } else { 1960 if (cause.get() == nullptr) { 1961 signature = "()V"; 1962 } else { 1963 signature = "(Ljava/lang/Throwable;)V"; 1964 } 1965 } 1966 ArtMethod* exception_init_method = 1967 exception_class->FindDeclaredDirectMethod("<init>", signature, cl->GetImagePointerSize()); 1968 1969 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1970 << PrettyDescriptor(exception_class_descriptor); 1971 1972 if (UNLIKELY(!runtime->IsStarted())) { 1973 // Something is trying to throw an exception without a started runtime, which is the common 1974 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1975 // the exception fields directly. 1976 if (msg != nullptr) { 1977 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1978 } 1979 if (cause.get() != nullptr) { 1980 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1981 } 1982 ScopedLocalRef<jobject> trace(GetJniEnv(), 1983 Runtime::Current()->IsActiveTransaction() 1984 ? CreateInternalStackTrace<true>(soa) 1985 : CreateInternalStackTrace<false>(soa)); 1986 if (trace.get() != nullptr) { 1987 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1988 } 1989 SetException(exception.Get()); 1990 } else { 1991 jvalue jv_args[2]; 1992 size_t i = 0; 1993 1994 if (msg != nullptr) { 1995 jv_args[i].l = msg_string.get(); 1996 ++i; 1997 } 1998 if (cause.get() != nullptr) { 1999 jv_args[i].l = cause.get(); 2000 ++i; 2001 } 2002 ScopedLocalRef<jobject> ref(soa.Env(), soa.AddLocalReference<jobject>(exception.Get())); 2003 InvokeWithJValues(soa, ref.get(), soa.EncodeMethod(exception_init_method), jv_args); 2004 if (LIKELY(!IsExceptionPending())) { 2005 SetException(exception.Get()); 2006 } 2007 } 2008} 2009 2010void Thread::ThrowOutOfMemoryError(const char* msg) { 2011 LOG(WARNING) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 2012 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 2013 if (!tls32_.throwing_OutOfMemoryError) { 2014 tls32_.throwing_OutOfMemoryError = true; 2015 ThrowNewException("Ljava/lang/OutOfMemoryError;", msg); 2016 tls32_.throwing_OutOfMemoryError = false; 2017 } else { 2018 Dump(LOG(WARNING)); // The pre-allocated OOME has no stack, so help out and log one. 2019 SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 2020 } 2021} 2022 2023Thread* Thread::CurrentFromGdb() { 2024 return Thread::Current(); 2025} 2026 2027void Thread::DumpFromGdb() const { 2028 std::ostringstream ss; 2029 Dump(ss); 2030 std::string str(ss.str()); 2031 // log to stderr for debugging command line processes 2032 std::cerr << str; 2033#ifdef HAVE_ANDROID_OS 2034 // log to logcat for debugging frameworks processes 2035 LOG(INFO) << str; 2036#endif 2037} 2038 2039// Explicitly instantiate 32 and 64bit thread offset dumping support. 2040template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 2041template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 2042 2043template<size_t ptr_size> 2044void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 2045#define DO_THREAD_OFFSET(x, y) \ 2046 if (offset == x.Uint32Value()) { \ 2047 os << y; \ 2048 return; \ 2049 } 2050 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 2051 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 2052 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 2053 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 2054 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 2055 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 2056 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 2057 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 2058 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 2059 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 2060 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 2061 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 2062#undef DO_THREAD_OFFSET 2063 2064#define INTERPRETER_ENTRY_POINT_INFO(x) \ 2065 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2066 os << #x; \ 2067 return; \ 2068 } 2069 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 2070 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 2071#undef INTERPRETER_ENTRY_POINT_INFO 2072 2073#define JNI_ENTRY_POINT_INFO(x) \ 2074 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2075 os << #x; \ 2076 return; \ 2077 } 2078 JNI_ENTRY_POINT_INFO(pDlsymLookup) 2079#undef JNI_ENTRY_POINT_INFO 2080 2081#define QUICK_ENTRY_POINT_INFO(x) \ 2082 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2083 os << #x; \ 2084 return; \ 2085 } 2086 QUICK_ENTRY_POINT_INFO(pAllocArray) 2087 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 2088 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 2089 QUICK_ENTRY_POINT_INFO(pAllocObject) 2090 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 2091 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 2092 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 2093 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 2094 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 2095 QUICK_ENTRY_POINT_INFO(pAllocStringFromBytes) 2096 QUICK_ENTRY_POINT_INFO(pAllocStringFromChars) 2097 QUICK_ENTRY_POINT_INFO(pAllocStringFromString) 2098 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 2099 QUICK_ENTRY_POINT_INFO(pCheckCast) 2100 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 2101 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 2102 QUICK_ENTRY_POINT_INFO(pInitializeType) 2103 QUICK_ENTRY_POINT_INFO(pResolveString) 2104 QUICK_ENTRY_POINT_INFO(pSet8Instance) 2105 QUICK_ENTRY_POINT_INFO(pSet8Static) 2106 QUICK_ENTRY_POINT_INFO(pSet16Instance) 2107 QUICK_ENTRY_POINT_INFO(pSet16Static) 2108 QUICK_ENTRY_POINT_INFO(pSet32Instance) 2109 QUICK_ENTRY_POINT_INFO(pSet32Static) 2110 QUICK_ENTRY_POINT_INFO(pSet64Instance) 2111 QUICK_ENTRY_POINT_INFO(pSet64Static) 2112 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 2113 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 2114 QUICK_ENTRY_POINT_INFO(pGetByteInstance) 2115 QUICK_ENTRY_POINT_INFO(pGetBooleanInstance) 2116 QUICK_ENTRY_POINT_INFO(pGetByteStatic) 2117 QUICK_ENTRY_POINT_INFO(pGetBooleanStatic) 2118 QUICK_ENTRY_POINT_INFO(pGetShortInstance) 2119 QUICK_ENTRY_POINT_INFO(pGetCharInstance) 2120 QUICK_ENTRY_POINT_INFO(pGetShortStatic) 2121 QUICK_ENTRY_POINT_INFO(pGetCharStatic) 2122 QUICK_ENTRY_POINT_INFO(pGet32Instance) 2123 QUICK_ENTRY_POINT_INFO(pGet32Static) 2124 QUICK_ENTRY_POINT_INFO(pGet64Instance) 2125 QUICK_ENTRY_POINT_INFO(pGet64Static) 2126 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 2127 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 2128 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 2129 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 2130 QUICK_ENTRY_POINT_INFO(pAputObject) 2131 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 2132 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 2133 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 2134 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 2135 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 2136 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 2137 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 2138 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 2139 QUICK_ENTRY_POINT_INFO(pLockObject) 2140 QUICK_ENTRY_POINT_INFO(pUnlockObject) 2141 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 2142 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 2143 QUICK_ENTRY_POINT_INFO(pCmplDouble) 2144 QUICK_ENTRY_POINT_INFO(pCmplFloat) 2145 QUICK_ENTRY_POINT_INFO(pFmod) 2146 QUICK_ENTRY_POINT_INFO(pL2d) 2147 QUICK_ENTRY_POINT_INFO(pFmodf) 2148 QUICK_ENTRY_POINT_INFO(pL2f) 2149 QUICK_ENTRY_POINT_INFO(pD2iz) 2150 QUICK_ENTRY_POINT_INFO(pF2iz) 2151 QUICK_ENTRY_POINT_INFO(pIdivmod) 2152 QUICK_ENTRY_POINT_INFO(pD2l) 2153 QUICK_ENTRY_POINT_INFO(pF2l) 2154 QUICK_ENTRY_POINT_INFO(pLdiv) 2155 QUICK_ENTRY_POINT_INFO(pLmod) 2156 QUICK_ENTRY_POINT_INFO(pLmul) 2157 QUICK_ENTRY_POINT_INFO(pShlLong) 2158 QUICK_ENTRY_POINT_INFO(pShrLong) 2159 QUICK_ENTRY_POINT_INFO(pUshrLong) 2160 QUICK_ENTRY_POINT_INFO(pIndexOf) 2161 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 2162 QUICK_ENTRY_POINT_INFO(pMemcpy) 2163 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 2164 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 2165 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 2166 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 2167 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 2168 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 2169 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 2170 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 2171 QUICK_ENTRY_POINT_INFO(pTestSuspend) 2172 QUICK_ENTRY_POINT_INFO(pDeliverException) 2173 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 2174 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 2175 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 2176 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 2177 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 2178 QUICK_ENTRY_POINT_INFO(pDeoptimize) 2179 QUICK_ENTRY_POINT_INFO(pA64Load) 2180 QUICK_ENTRY_POINT_INFO(pA64Store) 2181 QUICK_ENTRY_POINT_INFO(pNewEmptyString) 2182 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_B) 2183 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BI) 2184 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BII) 2185 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIII) 2186 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIIString) 2187 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BString) 2188 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIICharset) 2189 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BCharset) 2190 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_C) 2191 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_CII) 2192 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_IIC) 2193 QUICK_ENTRY_POINT_INFO(pNewStringFromCodePoints) 2194 QUICK_ENTRY_POINT_INFO(pNewStringFromString) 2195 QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuffer) 2196 QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuilder) 2197 QUICK_ENTRY_POINT_INFO(pReadBarrierJni) 2198#undef QUICK_ENTRY_POINT_INFO 2199 2200 os << offset; 2201} 2202 2203void Thread::QuickDeliverException() { 2204 // Get exception from thread. 2205 mirror::Throwable* exception = GetException(); 2206 CHECK(exception != nullptr); 2207 // Don't leave exception visible while we try to find the handler, which may cause class 2208 // resolution. 2209 ClearException(); 2210 bool is_deoptimization = (exception == GetDeoptimizationException()); 2211 QuickExceptionHandler exception_handler(this, is_deoptimization); 2212 if (is_deoptimization) { 2213 exception_handler.DeoptimizeStack(); 2214 } else { 2215 exception_handler.FindCatch(exception); 2216 } 2217 exception_handler.UpdateInstrumentationStack(); 2218 exception_handler.DoLongJump(); 2219} 2220 2221Context* Thread::GetLongJumpContext() { 2222 Context* result = tlsPtr_.long_jump_context; 2223 if (result == nullptr) { 2224 result = Context::Create(); 2225 } else { 2226 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 2227 result->Reset(); 2228 } 2229 return result; 2230} 2231 2232// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 2233// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 2234struct CurrentMethodVisitor FINAL : public StackVisitor { 2235 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 2236 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2237 : StackVisitor(thread, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 2238 this_object_(nullptr), 2239 method_(nullptr), 2240 dex_pc_(0), 2241 abort_on_error_(abort_on_error) {} 2242 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2243 ArtMethod* m = GetMethod(); 2244 if (m->IsRuntimeMethod()) { 2245 // Continue if this is a runtime method. 2246 return true; 2247 } 2248 if (context_ != nullptr) { 2249 this_object_ = GetThisObject(); 2250 } 2251 method_ = m; 2252 dex_pc_ = GetDexPc(abort_on_error_); 2253 return false; 2254 } 2255 mirror::Object* this_object_; 2256 ArtMethod* method_; 2257 uint32_t dex_pc_; 2258 const bool abort_on_error_; 2259}; 2260 2261ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 2262 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 2263 visitor.WalkStack(false); 2264 if (dex_pc != nullptr) { 2265 *dex_pc = visitor.dex_pc_; 2266 } 2267 return visitor.method_; 2268} 2269 2270bool Thread::HoldsLock(mirror::Object* object) const { 2271 if (object == nullptr) { 2272 return false; 2273 } 2274 return object->GetLockOwnerThreadId() == GetThreadId(); 2275} 2276 2277// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2278template <typename RootVisitor> 2279class ReferenceMapVisitor : public StackVisitor { 2280 public: 2281 ReferenceMapVisitor(Thread* thread, Context* context, RootVisitor& visitor) 2282 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2283 // We are visiting the references in compiled frames, so we do not need 2284 // to know the inlined frames. 2285 : StackVisitor(thread, context, StackVisitor::StackWalkKind::kSkipInlinedFrames), 2286 visitor_(visitor) {} 2287 2288 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2289 if (false) { 2290 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2291 << StringPrintf("@ PC:%04x", GetDexPc()); 2292 } 2293 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2294 if (shadow_frame != nullptr) { 2295 VisitShadowFrame(shadow_frame); 2296 } else { 2297 VisitQuickFrame(); 2298 } 2299 return true; 2300 } 2301 2302 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2303 ArtMethod* m = shadow_frame->GetMethod(); 2304 DCHECK(m != nullptr); 2305 size_t num_regs = shadow_frame->NumberOfVRegs(); 2306 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2307 // handle scope for JNI or References for interpreter. 2308 for (size_t reg = 0; reg < num_regs; ++reg) { 2309 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2310 if (ref != nullptr) { 2311 mirror::Object* new_ref = ref; 2312 visitor_(&new_ref, reg, this); 2313 if (new_ref != ref) { 2314 shadow_frame->SetVRegReference(reg, new_ref); 2315 } 2316 } 2317 } 2318 } else { 2319 // Java method. 2320 // Portable path use DexGcMap and store in Method.native_gc_map_. 2321 const uint8_t* gc_map = m->GetNativeGcMap(sizeof(void*)); 2322 CHECK(gc_map != nullptr) << PrettyMethod(m); 2323 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2324 uint32_t dex_pc = shadow_frame->GetDexPC(); 2325 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2326 DCHECK(reg_bitmap != nullptr); 2327 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2328 for (size_t reg = 0; reg < num_regs; ++reg) { 2329 if (TestBitmap(reg, reg_bitmap)) { 2330 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2331 if (ref != nullptr) { 2332 mirror::Object* new_ref = ref; 2333 visitor_(&new_ref, reg, this); 2334 if (new_ref != ref) { 2335 shadow_frame->SetVRegReference(reg, new_ref); 2336 } 2337 } 2338 } 2339 } 2340 } 2341 } 2342 2343 private: 2344 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2345 auto* cur_quick_frame = GetCurrentQuickFrame(); 2346 DCHECK(cur_quick_frame != nullptr); 2347 auto* m = *cur_quick_frame; 2348 2349 // Process register map (which native and runtime methods don't have) 2350 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2351 if (m->IsOptimized(sizeof(void*))) { 2352 auto* vreg_base = reinterpret_cast<StackReference<mirror::Object>*>( 2353 reinterpret_cast<uintptr_t>(cur_quick_frame)); 2354 Runtime* runtime = Runtime::Current(); 2355 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2356 uintptr_t native_pc_offset = m->NativeQuickPcOffset(GetCurrentQuickFramePc(), entry_point); 2357 CodeInfo code_info = m->GetOptimizedCodeInfo(); 2358 StackMapEncoding encoding = code_info.ExtractEncoding(); 2359 StackMap map = code_info.GetStackMapForNativePcOffset(native_pc_offset, encoding); 2360 DCHECK(map.IsValid()); 2361 MemoryRegion mask = map.GetStackMask(encoding); 2362 // Visit stack entries that hold pointers. 2363 for (size_t i = 0; i < mask.size_in_bits(); ++i) { 2364 if (mask.LoadBit(i)) { 2365 auto* ref_addr = vreg_base + i; 2366 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2367 if (ref != nullptr) { 2368 mirror::Object* new_ref = ref; 2369 visitor_(&new_ref, -1, this); 2370 if (ref != new_ref) { 2371 ref_addr->Assign(new_ref); 2372 } 2373 } 2374 } 2375 } 2376 // Visit callee-save registers that hold pointers. 2377 uint32_t register_mask = map.GetRegisterMask(encoding); 2378 for (size_t i = 0; i < BitSizeOf<uint32_t>(); ++i) { 2379 if (register_mask & (1 << i)) { 2380 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(i)); 2381 if (*ref_addr != nullptr) { 2382 visitor_(ref_addr, -1, this); 2383 } 2384 } 2385 } 2386 } else { 2387 const uint8_t* native_gc_map = m->GetNativeGcMap(sizeof(void*)); 2388 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2389 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2390 // Can't be null or how would we compile its instructions? 2391 DCHECK(code_item != nullptr) << PrettyMethod(m); 2392 NativePcOffsetToReferenceMap map(native_gc_map); 2393 size_t num_regs = map.RegWidth() * 8; 2394 if (num_regs > 0) { 2395 Runtime* runtime = Runtime::Current(); 2396 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2397 uintptr_t native_pc_offset = m->NativeQuickPcOffset(GetCurrentQuickFramePc(), entry_point); 2398 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2399 DCHECK(reg_bitmap != nullptr); 2400 const void* code_pointer = ArtMethod::EntryPointToCodePointer(entry_point); 2401 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 2402 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2403 // For all dex registers in the bitmap 2404 DCHECK(cur_quick_frame != nullptr); 2405 for (size_t reg = 0; reg < num_regs; ++reg) { 2406 // Does this register hold a reference? 2407 if (TestBitmap(reg, reg_bitmap)) { 2408 uint32_t vmap_offset; 2409 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2410 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2411 kReferenceVReg); 2412 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2413 mirror::Object** ref_addr = 2414 reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2415 if (*ref_addr != nullptr) { 2416 visitor_(ref_addr, reg, this); 2417 } 2418 } else { 2419 StackReference<mirror::Object>* ref_addr = 2420 reinterpret_cast<StackReference<mirror::Object>*>(GetVRegAddrFromQuickCode( 2421 cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2422 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2423 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2424 if (ref != nullptr) { 2425 mirror::Object* new_ref = ref; 2426 visitor_(&new_ref, reg, this); 2427 if (ref != new_ref) { 2428 ref_addr->Assign(new_ref); 2429 } 2430 } 2431 } 2432 } 2433 } 2434 } 2435 } 2436 } 2437 } 2438 2439 // Visitor for when we visit a root. 2440 RootVisitor& visitor_; 2441}; 2442 2443class RootCallbackVisitor { 2444 public: 2445 RootCallbackVisitor(RootVisitor* visitor, uint32_t tid) : visitor_(visitor), tid_(tid) {} 2446 2447 void operator()(mirror::Object** obj, size_t vreg, const StackVisitor* stack_visitor) const 2448 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2449 visitor_->VisitRoot(obj, JavaFrameRootInfo(tid_, stack_visitor, vreg)); 2450 } 2451 2452 private: 2453 RootVisitor* const visitor_; 2454 const uint32_t tid_; 2455}; 2456 2457void Thread::VisitRoots(RootVisitor* visitor) { 2458 const uint32_t thread_id = GetThreadId(); 2459 visitor->VisitRootIfNonNull(&tlsPtr_.opeer, RootInfo(kRootThreadObject, thread_id)); 2460 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2461 visitor->VisitRoot(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), 2462 RootInfo(kRootNativeStack, thread_id)); 2463 } 2464 visitor->VisitRootIfNonNull(&tlsPtr_.monitor_enter_object, RootInfo(kRootNativeStack, thread_id)); 2465 tlsPtr_.jni_env->locals.VisitRoots(visitor, RootInfo(kRootJNILocal, thread_id)); 2466 tlsPtr_.jni_env->monitors.VisitRoots(visitor, RootInfo(kRootJNIMonitor, thread_id)); 2467 HandleScopeVisitRoots(visitor, thread_id); 2468 if (tlsPtr_.debug_invoke_req != nullptr) { 2469 tlsPtr_.debug_invoke_req->VisitRoots(visitor, RootInfo(kRootDebugger, thread_id)); 2470 } 2471 if (tlsPtr_.stacked_shadow_frame_record != nullptr) { 2472 RootCallbackVisitor visitor_to_callback(visitor, thread_id); 2473 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitor_to_callback); 2474 for (StackedShadowFrameRecord* record = tlsPtr_.stacked_shadow_frame_record; 2475 record != nullptr; 2476 record = record->GetLink()) { 2477 for (ShadowFrame* shadow_frame = record->GetShadowFrame(); 2478 shadow_frame != nullptr; 2479 shadow_frame = shadow_frame->GetLink()) { 2480 mapper.VisitShadowFrame(shadow_frame); 2481 } 2482 } 2483 } 2484 if (tlsPtr_.deoptimization_return_value_stack != nullptr) { 2485 for (DeoptimizationReturnValueRecord* record = tlsPtr_.deoptimization_return_value_stack; 2486 record != nullptr; 2487 record = record->GetLink()) { 2488 if (record->IsReference()) { 2489 visitor->VisitRootIfNonNull(record->GetGCRoot(), 2490 RootInfo(kRootThreadObject, thread_id)); 2491 } 2492 } 2493 } 2494 for (auto* verifier = tlsPtr_.method_verifier; verifier != nullptr; verifier = verifier->link_) { 2495 verifier->VisitRoots(visitor, RootInfo(kRootNativeStack, thread_id)); 2496 } 2497 // Visit roots on this thread's stack 2498 Context* context = GetLongJumpContext(); 2499 RootCallbackVisitor visitor_to_callback(visitor, thread_id); 2500 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitor_to_callback); 2501 mapper.WalkStack(); 2502 ReleaseLongJumpContext(context); 2503 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2504 visitor->VisitRootIfNonNull(&frame.this_object_, RootInfo(kRootVMInternal, thread_id)); 2505 } 2506} 2507 2508class VerifyRootVisitor : public SingleRootVisitor { 2509 public: 2510 void VisitRoot(mirror::Object* root, const RootInfo& info ATTRIBUTE_UNUSED) 2511 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2512 VerifyObject(root); 2513 } 2514}; 2515 2516void Thread::VerifyStackImpl() { 2517 VerifyRootVisitor visitor; 2518 std::unique_ptr<Context> context(Context::Create()); 2519 RootCallbackVisitor visitor_to_callback(&visitor, GetThreadId()); 2520 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitor_to_callback); 2521 mapper.WalkStack(); 2522} 2523 2524// Set the stack end to that to be used during a stack overflow 2525void Thread::SetStackEndForStackOverflow() { 2526 // During stack overflow we allow use of the full stack. 2527 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2528 // However, we seem to have already extended to use the full stack. 2529 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2530 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2531 DumpStack(LOG(ERROR)); 2532 LOG(FATAL) << "Recursive stack overflow."; 2533 } 2534 2535 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2536 2537 // Remove the stack overflow protection if is it set up. 2538 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2539 if (implicit_stack_check) { 2540 if (!UnprotectStack()) { 2541 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2542 } 2543 } 2544} 2545 2546void Thread::SetTlab(uint8_t* start, uint8_t* end) { 2547 DCHECK_LE(start, end); 2548 tlsPtr_.thread_local_start = start; 2549 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2550 tlsPtr_.thread_local_end = end; 2551 tlsPtr_.thread_local_objects = 0; 2552} 2553 2554bool Thread::HasTlab() const { 2555 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2556 if (has_tlab) { 2557 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2558 } else { 2559 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2560 } 2561 return has_tlab; 2562} 2563 2564std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2565 thread.ShortDump(os); 2566 return os; 2567} 2568 2569void Thread::ProtectStack() { 2570 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2571 VLOG(threads) << "Protecting stack at " << pregion; 2572 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2573 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2574 "Reason: " 2575 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2576 } 2577} 2578 2579bool Thread::UnprotectStack() { 2580 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2581 VLOG(threads) << "Unprotecting stack at " << pregion; 2582 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2583} 2584 2585void Thread::ActivateSingleStepControl(SingleStepControl* ssc) { 2586 CHECK(Dbg::IsDebuggerActive()); 2587 CHECK(GetSingleStepControl() == nullptr) << "Single step already active in thread " << *this; 2588 CHECK(ssc != nullptr); 2589 tlsPtr_.single_step_control = ssc; 2590} 2591 2592void Thread::DeactivateSingleStepControl() { 2593 CHECK(Dbg::IsDebuggerActive()); 2594 CHECK(GetSingleStepControl() != nullptr) << "Single step not active in thread " << *this; 2595 SingleStepControl* ssc = GetSingleStepControl(); 2596 tlsPtr_.single_step_control = nullptr; 2597 delete ssc; 2598} 2599 2600void Thread::SetDebugInvokeReq(DebugInvokeReq* req) { 2601 CHECK(Dbg::IsDebuggerActive()); 2602 CHECK(GetInvokeReq() == nullptr) << "Debug invoke req already active in thread " << *this; 2603 CHECK(Thread::Current() != this) << "Debug invoke can't be dispatched by the thread itself"; 2604 CHECK(req != nullptr); 2605 tlsPtr_.debug_invoke_req = req; 2606} 2607 2608void Thread::ClearDebugInvokeReq() { 2609 CHECK(GetInvokeReq() != nullptr) << "Debug invoke req not active in thread " << *this; 2610 CHECK(Thread::Current() == this) << "Debug invoke must be finished by the thread itself"; 2611 DebugInvokeReq* req = tlsPtr_.debug_invoke_req; 2612 tlsPtr_.debug_invoke_req = nullptr; 2613 delete req; 2614} 2615 2616void Thread::PushVerifier(verifier::MethodVerifier* verifier) { 2617 verifier->link_ = tlsPtr_.method_verifier; 2618 tlsPtr_.method_verifier = verifier; 2619} 2620 2621void Thread::PopVerifier(verifier::MethodVerifier* verifier) { 2622 CHECK_EQ(tlsPtr_.method_verifier, verifier); 2623 tlsPtr_.method_verifier = verifier->link_; 2624} 2625 2626} // namespace art 2627