thread.cc revision 10e5ea90e20375e5ad2ff26cb760c0e7c586cc16
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/memory_tool.h" 39#include "base/mutex.h" 40#include "base/timing_logger.h" 41#include "base/to_str.h" 42#include "class_linker-inl.h" 43#include "debugger.h" 44#include "dex_file-inl.h" 45#include "entrypoints/entrypoint_utils.h" 46#include "entrypoints/quick/quick_alloc_entrypoints.h" 47#include "gc_map.h" 48#include "gc/accounting/card_table-inl.h" 49#include "gc/allocator/rosalloc.h" 50#include "gc/heap.h" 51#include "gc/space/space.h" 52#include "handle_scope-inl.h" 53#include "indirect_reference_table-inl.h" 54#include "jni_internal.h" 55#include "mirror/class_loader.h" 56#include "mirror/class-inl.h" 57#include "mirror/object_array-inl.h" 58#include "mirror/stack_trace_element.h" 59#include "monitor.h" 60#include "object_lock.h" 61#include "quick_exception_handler.h" 62#include "quick/quick_method_frame_info.h" 63#include "reflection.h" 64#include "runtime.h" 65#include "scoped_thread_state_change.h" 66#include "ScopedLocalRef.h" 67#include "ScopedUtfChars.h" 68#include "stack.h" 69#include "thread_list.h" 70#include "thread-inl.h" 71#include "utils.h" 72#include "verifier/dex_gc_map.h" 73#include "verifier/method_verifier.h" 74#include "verify_object-inl.h" 75#include "vmap_table.h" 76#include "well_known_classes.h" 77 78#if ART_USE_FUTEXES 79#include "linux/futex.h" 80#include "sys/syscall.h" 81#ifndef SYS_futex 82#define SYS_futex __NR_futex 83#endif 84#endif // ART_USE_FUTEXES 85 86namespace art { 87 88bool Thread::is_started_ = false; 89pthread_key_t Thread::pthread_key_self_; 90ConditionVariable* Thread::resume_cond_ = nullptr; 91const size_t Thread::kStackOverflowImplicitCheckSize = GetStackOverflowReservedBytes(kRuntimeISA); 92 93// For implicit overflow checks we reserve an extra piece of memory at the bottom 94// of the stack (lowest memory). The higher portion of the memory 95// is protected against reads and the lower is available for use while 96// throwing the StackOverflow exception. 97constexpr size_t kStackOverflowProtectedSize = 4 * kMemoryToolStackGuardSizeScale * KB; 98 99static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 100 101void Thread::InitCardTable() { 102 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 103} 104 105static void UnimplementedEntryPoint() { 106 UNIMPLEMENTED(FATAL); 107} 108 109void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 110 QuickEntryPoints* qpoints); 111 112void Thread::InitTlsEntryPoints() { 113 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 114 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 115 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(&tlsPtr_.quick_entrypoints) + 116 sizeof(tlsPtr_.quick_entrypoints)); 117 for (uintptr_t* it = begin; it != end; ++it) { 118 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 119 } 120 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 121 &tlsPtr_.quick_entrypoints); 122} 123 124void Thread::InitStringEntryPoints() { 125 ScopedObjectAccess soa(this); 126 QuickEntryPoints* qpoints = &tlsPtr_.quick_entrypoints; 127 qpoints->pNewEmptyString = reinterpret_cast<void(*)()>( 128 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newEmptyString)); 129 qpoints->pNewStringFromBytes_B = reinterpret_cast<void(*)()>( 130 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_B)); 131 qpoints->pNewStringFromBytes_BI = reinterpret_cast<void(*)()>( 132 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BI)); 133 qpoints->pNewStringFromBytes_BII = reinterpret_cast<void(*)()>( 134 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BII)); 135 qpoints->pNewStringFromBytes_BIII = reinterpret_cast<void(*)()>( 136 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BIII)); 137 qpoints->pNewStringFromBytes_BIIString = reinterpret_cast<void(*)()>( 138 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BIIString)); 139 qpoints->pNewStringFromBytes_BString = reinterpret_cast<void(*)()>( 140 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BString)); 141 qpoints->pNewStringFromBytes_BIICharset = reinterpret_cast<void(*)()>( 142 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BIICharset)); 143 qpoints->pNewStringFromBytes_BCharset = reinterpret_cast<void(*)()>( 144 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromBytes_BCharset)); 145 qpoints->pNewStringFromChars_C = reinterpret_cast<void(*)()>( 146 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromChars_C)); 147 qpoints->pNewStringFromChars_CII = reinterpret_cast<void(*)()>( 148 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromChars_CII)); 149 qpoints->pNewStringFromChars_IIC = reinterpret_cast<void(*)()>( 150 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromChars_IIC)); 151 qpoints->pNewStringFromCodePoints = reinterpret_cast<void(*)()>( 152 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromCodePoints)); 153 qpoints->pNewStringFromString = reinterpret_cast<void(*)()>( 154 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromString)); 155 qpoints->pNewStringFromStringBuffer = reinterpret_cast<void(*)()>( 156 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromStringBuffer)); 157 qpoints->pNewStringFromStringBuilder = reinterpret_cast<void(*)()>( 158 soa.DecodeMethod(WellKnownClasses::java_lang_StringFactory_newStringFromStringBuilder)); 159} 160 161void Thread::ResetQuickAllocEntryPointsForThread() { 162 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 163} 164 165class DeoptimizationReturnValueRecord { 166 public: 167 DeoptimizationReturnValueRecord(const JValue& ret_val, 168 bool is_reference, 169 DeoptimizationReturnValueRecord* link) 170 : ret_val_(ret_val), is_reference_(is_reference), link_(link) {} 171 172 JValue GetReturnValue() const { return ret_val_; } 173 bool IsReference() const { return is_reference_; } 174 DeoptimizationReturnValueRecord* GetLink() const { return link_; } 175 mirror::Object** GetGCRoot() { 176 DCHECK(is_reference_); 177 return ret_val_.GetGCRoot(); 178 } 179 180 private: 181 JValue ret_val_; 182 const bool is_reference_; 183 DeoptimizationReturnValueRecord* const link_; 184 185 DISALLOW_COPY_AND_ASSIGN(DeoptimizationReturnValueRecord); 186}; 187 188class StackedShadowFrameRecord { 189 public: 190 StackedShadowFrameRecord(ShadowFrame* shadow_frame, 191 StackedShadowFrameType type, 192 StackedShadowFrameRecord* link) 193 : shadow_frame_(shadow_frame), 194 type_(type), 195 link_(link) {} 196 197 ShadowFrame* GetShadowFrame() const { return shadow_frame_; } 198 StackedShadowFrameType GetType() const { return type_; } 199 StackedShadowFrameRecord* GetLink() const { return link_; } 200 201 private: 202 ShadowFrame* const shadow_frame_; 203 const StackedShadowFrameType type_; 204 StackedShadowFrameRecord* const link_; 205 206 DISALLOW_COPY_AND_ASSIGN(StackedShadowFrameRecord); 207}; 208 209void Thread::PushAndClearDeoptimizationReturnValue() { 210 DeoptimizationReturnValueRecord* record = new DeoptimizationReturnValueRecord( 211 tls64_.deoptimization_return_value, 212 tls32_.deoptimization_return_value_is_reference, 213 tlsPtr_.deoptimization_return_value_stack); 214 tlsPtr_.deoptimization_return_value_stack = record; 215 ClearDeoptimizationReturnValue(); 216} 217 218JValue Thread::PopDeoptimizationReturnValue() { 219 DeoptimizationReturnValueRecord* record = tlsPtr_.deoptimization_return_value_stack; 220 DCHECK(record != nullptr); 221 tlsPtr_.deoptimization_return_value_stack = record->GetLink(); 222 JValue ret_val(record->GetReturnValue()); 223 delete record; 224 return ret_val; 225} 226 227void Thread::PushStackedShadowFrame(ShadowFrame* sf, StackedShadowFrameType type) { 228 StackedShadowFrameRecord* record = new StackedShadowFrameRecord( 229 sf, type, tlsPtr_.stacked_shadow_frame_record); 230 tlsPtr_.stacked_shadow_frame_record = record; 231} 232 233ShadowFrame* Thread::PopStackedShadowFrame(StackedShadowFrameType type) { 234 StackedShadowFrameRecord* record = tlsPtr_.stacked_shadow_frame_record; 235 DCHECK(record != nullptr); 236 DCHECK_EQ(record->GetType(), type); 237 tlsPtr_.stacked_shadow_frame_record = record->GetLink(); 238 ShadowFrame* shadow_frame = record->GetShadowFrame(); 239 delete record; 240 return shadow_frame; 241} 242 243void Thread::InitTid() { 244 tls32_.tid = ::art::GetTid(); 245} 246 247void Thread::InitAfterFork() { 248 // One thread (us) survived the fork, but we have a new tid so we need to 249 // update the value stashed in this Thread*. 250 InitTid(); 251} 252 253void* Thread::CreateCallback(void* arg) { 254 Thread* self = reinterpret_cast<Thread*>(arg); 255 Runtime* runtime = Runtime::Current(); 256 if (runtime == nullptr) { 257 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 258 return nullptr; 259 } 260 { 261 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 262 // after self->Init(). 263 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 264 // Check that if we got here we cannot be shutting down (as shutdown should never have started 265 // while threads are being born). 266 CHECK(!runtime->IsShuttingDownLocked()); 267 // Note: given that the JNIEnv is created in the parent thread, the only failure point here is 268 // a mess in InitStackHwm. We do not have a reasonable way to recover from that, so abort 269 // the runtime in such a case. In case this ever changes, we need to make sure here to 270 // delete the tmp_jni_env, as we own it at this point. 271 CHECK(self->Init(runtime->GetThreadList(), runtime->GetJavaVM(), self->tlsPtr_.tmp_jni_env)); 272 self->tlsPtr_.tmp_jni_env = nullptr; 273 Runtime::Current()->EndThreadBirth(); 274 } 275 { 276 ScopedObjectAccess soa(self); 277 self->InitStringEntryPoints(); 278 279 // Copy peer into self, deleting global reference when done. 280 CHECK(self->tlsPtr_.jpeer != nullptr); 281 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 282 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 283 self->tlsPtr_.jpeer = nullptr; 284 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 285 286 ArtField* priorityField = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority); 287 self->SetNativePriority(priorityField->GetInt(self->tlsPtr_.opeer)); 288 Dbg::PostThreadStart(self); 289 290 // Invoke the 'run' method of our java.lang.Thread. 291 mirror::Object* receiver = self->tlsPtr_.opeer; 292 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 293 ScopedLocalRef<jobject> ref(soa.Env(), soa.AddLocalReference<jobject>(receiver)); 294 InvokeVirtualOrInterfaceWithJValues(soa, ref.get(), mid, nullptr); 295 } 296 // Detach and delete self. 297 Runtime::Current()->GetThreadList()->Unregister(self); 298 299 return nullptr; 300} 301 302Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 303 mirror::Object* thread_peer) { 304 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 305 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 306 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 307 // to stop it from going away. 308 if (kIsDebugBuild) { 309 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 310 if (result != nullptr && !result->IsSuspended()) { 311 Locks::thread_list_lock_->AssertHeld(soa.Self()); 312 } 313 } 314 return result; 315} 316 317Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 318 jobject java_thread) { 319 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 320} 321 322static size_t FixStackSize(size_t stack_size) { 323 // A stack size of zero means "use the default". 324 if (stack_size == 0) { 325 stack_size = Runtime::Current()->GetDefaultStackSize(); 326 } 327 328 // Dalvik used the bionic pthread default stack size for native threads, 329 // so include that here to support apps that expect large native stacks. 330 stack_size += 1 * MB; 331 332 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 333 if (stack_size < PTHREAD_STACK_MIN) { 334 stack_size = PTHREAD_STACK_MIN; 335 } 336 337 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 338 // It's likely that callers are trying to ensure they have at least a certain amount of 339 // stack space, so we should add our reserved space on top of what they requested, rather 340 // than implicitly take it away from them. 341 stack_size += GetStackOverflowReservedBytes(kRuntimeISA); 342 } else { 343 // If we are going to use implicit stack checks, allocate space for the protected 344 // region at the bottom of the stack. 345 stack_size += Thread::kStackOverflowImplicitCheckSize + 346 GetStackOverflowReservedBytes(kRuntimeISA); 347 } 348 349 // Some systems require the stack size to be a multiple of the system page size, so round up. 350 stack_size = RoundUp(stack_size, kPageSize); 351 352 return stack_size; 353} 354 355// Global variable to prevent the compiler optimizing away the page reads for the stack. 356uint8_t dont_optimize_this; 357 358// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 359// overflow is detected. It is located right below the stack_begin_. 360// 361// There is a little complexity here that deserves a special mention. On some 362// architectures, the stack created using a VM_GROWSDOWN flag 363// to prevent memory being allocated when it's not needed. This flag makes the 364// kernel only allocate memory for the stack by growing down in memory. Because we 365// want to put an mprotected region far away from that at the stack top, we need 366// to make sure the pages for the stack are mapped in before we call mprotect. We do 367// this by reading every page from the stack bottom (highest address) to the stack top. 368// We then madvise this away. 369 370// AddressSanitizer does not like the part of this functions that reads every stack page. 371// Looks a lot like an out-of-bounds access. 372ATTRIBUTE_NO_SANITIZE_ADDRESS 373void Thread::InstallImplicitProtection() { 374 uint8_t* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 375 uint8_t* stack_himem = tlsPtr_.stack_end; 376 uint8_t* stack_top = reinterpret_cast<uint8_t*>(reinterpret_cast<uintptr_t>(&stack_himem) & 377 ~(kPageSize - 1)); // Page containing current top of stack. 378 379 // First remove the protection on the protected region as will want to read and 380 // write it. This may fail (on the first attempt when the stack is not mapped) 381 // but we ignore that. 382 UnprotectStack(); 383 384 // Map in the stack. This must be done by reading from the 385 // current stack pointer downwards as the stack may be mapped using VM_GROWSDOWN 386 // in the kernel. Any access more than a page below the current SP might cause 387 // a segv. 388 389 // Read every page from the high address to the low. 390 for (uint8_t* p = stack_top; p >= pregion; p -= kPageSize) { 391 dont_optimize_this = *p; 392 } 393 394 VLOG(threads) << "installing stack protected region at " << std::hex << 395 static_cast<void*>(pregion) << " to " << 396 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 397 398 // Protect the bottom of the stack to prevent read/write to it. 399 ProtectStack(); 400 401 // Tell the kernel that we won't be needing these pages any more. 402 // NB. madvise will probably write zeroes into the memory (on linux it does). 403 uint32_t unwanted_size = stack_top - pregion - kPageSize; 404 madvise(pregion, unwanted_size, MADV_DONTNEED); 405} 406 407void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 408 CHECK(java_peer != nullptr); 409 Thread* self = static_cast<JNIEnvExt*>(env)->self; 410 411 if (VLOG_IS_ON(threads)) { 412 ScopedObjectAccess soa(env); 413 414 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 415 mirror::String* java_name = reinterpret_cast<mirror::String*>(f->GetObject( 416 soa.Decode<mirror::Object*>(java_peer))); 417 std::string thread_name; 418 if (java_name != nullptr) { 419 thread_name = java_name->ToModifiedUtf8(); 420 } else { 421 thread_name = "(Unnamed)"; 422 } 423 424 VLOG(threads) << "Creating native thread for " << thread_name; 425 self->Dump(LOG(INFO)); 426 } 427 428 Runtime* runtime = Runtime::Current(); 429 430 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 431 bool thread_start_during_shutdown = false; 432 { 433 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 434 if (runtime->IsShuttingDownLocked()) { 435 thread_start_during_shutdown = true; 436 } else { 437 runtime->StartThreadBirth(); 438 } 439 } 440 if (thread_start_during_shutdown) { 441 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 442 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 443 return; 444 } 445 446 Thread* child_thread = new Thread(is_daemon); 447 // Use global JNI ref to hold peer live while child thread starts. 448 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 449 stack_size = FixStackSize(stack_size); 450 451 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 452 // assign it. 453 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 454 reinterpret_cast<jlong>(child_thread)); 455 456 // Try to allocate a JNIEnvExt for the thread. We do this here as we might be out of memory and 457 // do not have a good way to report this on the child's side. 458 std::unique_ptr<JNIEnvExt> child_jni_env_ext( 459 JNIEnvExt::Create(child_thread, Runtime::Current()->GetJavaVM())); 460 461 int pthread_create_result = 0; 462 if (child_jni_env_ext.get() != nullptr) { 463 pthread_t new_pthread; 464 pthread_attr_t attr; 465 child_thread->tlsPtr_.tmp_jni_env = child_jni_env_ext.get(); 466 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 467 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), 468 "PTHREAD_CREATE_DETACHED"); 469 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 470 pthread_create_result = pthread_create(&new_pthread, 471 &attr, 472 Thread::CreateCallback, 473 child_thread); 474 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 475 476 if (pthread_create_result == 0) { 477 // pthread_create started the new thread. The child is now responsible for managing the 478 // JNIEnvExt we created. 479 // Note: we can't check for tmp_jni_env == nullptr, as that would require synchronization 480 // between the threads. 481 child_jni_env_ext.release(); 482 return; 483 } 484 } 485 486 // Either JNIEnvExt::Create or pthread_create(3) failed, so clean up. 487 { 488 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 489 runtime->EndThreadBirth(); 490 } 491 // Manually delete the global reference since Thread::Init will not have been run. 492 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 493 child_thread->tlsPtr_.jpeer = nullptr; 494 delete child_thread; 495 child_thread = nullptr; 496 // TODO: remove from thread group? 497 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 498 { 499 std::string msg(child_jni_env_ext.get() == nullptr ? 500 "Could not allocate JNI Env" : 501 StringPrintf("pthread_create (%s stack) failed: %s", 502 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 503 ScopedObjectAccess soa(env); 504 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 505 } 506} 507 508bool Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm, JNIEnvExt* jni_env_ext) { 509 // This function does all the initialization that must be run by the native thread it applies to. 510 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 511 // we can handshake with the corresponding native thread when it's ready.) Check this native 512 // thread hasn't been through here already... 513 CHECK(Thread::Current() == nullptr); 514 515 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 516 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 517 tlsPtr_.pthread_self = pthread_self(); 518 CHECK(is_started_); 519 520 SetUpAlternateSignalStack(); 521 if (!InitStackHwm()) { 522 return false; 523 } 524 InitCpu(); 525 InitTlsEntryPoints(); 526 RemoveSuspendTrigger(); 527 InitCardTable(); 528 InitTid(); 529 530#ifdef __ANDROID__ 531 __get_tls()[TLS_SLOT_ART_THREAD_SELF] = this; 532#else 533 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 534#endif 535 DCHECK_EQ(Thread::Current(), this); 536 537 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 538 539 if (jni_env_ext != nullptr) { 540 DCHECK_EQ(jni_env_ext->vm, java_vm); 541 DCHECK_EQ(jni_env_ext->self, this); 542 tlsPtr_.jni_env = jni_env_ext; 543 } else { 544 tlsPtr_.jni_env = JNIEnvExt::Create(this, java_vm); 545 if (tlsPtr_.jni_env == nullptr) { 546 return false; 547 } 548 } 549 550 thread_list->Register(this); 551 return true; 552} 553 554Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 555 bool create_peer) { 556 Runtime* runtime = Runtime::Current(); 557 if (runtime == nullptr) { 558 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 559 return nullptr; 560 } 561 Thread* self; 562 { 563 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 564 if (runtime->IsShuttingDownLocked()) { 565 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 566 return nullptr; 567 } else { 568 Runtime::Current()->StartThreadBirth(); 569 self = new Thread(as_daemon); 570 bool init_success = self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 571 Runtime::Current()->EndThreadBirth(); 572 if (!init_success) { 573 delete self; 574 return nullptr; 575 } 576 } 577 } 578 579 self->InitStringEntryPoints(); 580 581 CHECK_NE(self->GetState(), kRunnable); 582 self->SetState(kNative); 583 584 // If we're the main thread, ClassLinker won't be created until after we're attached, 585 // so that thread needs a two-stage attach. Regular threads don't need this hack. 586 // In the compiler, all threads need this hack, because no-one's going to be getting 587 // a native peer! 588 if (create_peer) { 589 self->CreatePeer(thread_name, as_daemon, thread_group); 590 } else { 591 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 592 if (thread_name != nullptr) { 593 self->tlsPtr_.name->assign(thread_name); 594 ::art::SetThreadName(thread_name); 595 } else if (self->GetJniEnv()->check_jni) { 596 LOG(WARNING) << *Thread::Current() << " attached without supplying a name"; 597 } 598 } 599 600 if (VLOG_IS_ON(threads)) { 601 if (thread_name != nullptr) { 602 VLOG(threads) << "Attaching thread " << thread_name; 603 } else { 604 VLOG(threads) << "Attaching unnamed thread."; 605 } 606 ScopedObjectAccess soa(self); 607 self->Dump(LOG(INFO)); 608 } 609 610 { 611 ScopedObjectAccess soa(self); 612 Dbg::PostThreadStart(self); 613 } 614 615 return self; 616} 617 618void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 619 Runtime* runtime = Runtime::Current(); 620 CHECK(runtime->IsStarted()); 621 JNIEnv* env = tlsPtr_.jni_env; 622 623 if (thread_group == nullptr) { 624 thread_group = runtime->GetMainThreadGroup(); 625 } 626 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 627 // Add missing null check in case of OOM b/18297817 628 if (name != nullptr && thread_name.get() == nullptr) { 629 CHECK(IsExceptionPending()); 630 return; 631 } 632 jint thread_priority = GetNativePriority(); 633 jboolean thread_is_daemon = as_daemon; 634 635 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 636 if (peer.get() == nullptr) { 637 CHECK(IsExceptionPending()); 638 return; 639 } 640 { 641 ScopedObjectAccess soa(this); 642 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 643 } 644 env->CallNonvirtualVoidMethod(peer.get(), 645 WellKnownClasses::java_lang_Thread, 646 WellKnownClasses::java_lang_Thread_init, 647 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 648 AssertNoPendingException(); 649 650 Thread* self = this; 651 DCHECK_EQ(self, Thread::Current()); 652 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 653 reinterpret_cast<jlong>(self)); 654 655 ScopedObjectAccess soa(self); 656 StackHandleScope<1> hs(self); 657 MutableHandle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 658 if (peer_thread_name.Get() == nullptr) { 659 // The Thread constructor should have set the Thread.name to a 660 // non-null value. However, because we can run without code 661 // available (in the compiler, in tests), we manually assign the 662 // fields the constructor should have set. 663 if (runtime->IsActiveTransaction()) { 664 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 665 } else { 666 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 667 } 668 peer_thread_name.Assign(GetThreadName(soa)); 669 } 670 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 671 if (peer_thread_name.Get() != nullptr) { 672 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 673 } 674} 675 676template<bool kTransactionActive> 677void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 678 jobject thread_name, jint thread_priority) { 679 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 680 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 681 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 682 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 683 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 684 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 685 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 686 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 687} 688 689void Thread::SetThreadName(const char* name) { 690 tlsPtr_.name->assign(name); 691 ::art::SetThreadName(name); 692 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 693} 694 695bool Thread::InitStackHwm() { 696 void* read_stack_base; 697 size_t read_stack_size; 698 size_t read_guard_size; 699 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size, &read_guard_size); 700 701 tlsPtr_.stack_begin = reinterpret_cast<uint8_t*>(read_stack_base); 702 tlsPtr_.stack_size = read_stack_size; 703 704 // The minimum stack size we can cope with is the overflow reserved bytes (typically 705 // 8K) + the protected region size (4K) + another page (4K). Typically this will 706 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 707 // between 8K and 12K. 708 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 709 + 4 * KB; 710 if (read_stack_size <= min_stack) { 711 // Note, as we know the stack is small, avoid operations that could use a lot of stack. 712 LogMessage::LogLineLowStack(__PRETTY_FUNCTION__, __LINE__, ERROR, 713 "Attempt to attach a thread with a too-small stack"); 714 return false; 715 } 716 717 // This is included in the SIGQUIT output, but it's useful here for thread debugging. 718 VLOG(threads) << StringPrintf("Native stack is at %p (%s with %s guard)", 719 read_stack_base, 720 PrettySize(read_stack_size).c_str(), 721 PrettySize(read_guard_size).c_str()); 722 723 // Set stack_end_ to the bottom of the stack saving space of stack overflows 724 725 Runtime* runtime = Runtime::Current(); 726 bool implicit_stack_check = !runtime->ExplicitStackOverflowChecks() && !runtime->IsAotCompiler(); 727 ResetDefaultStackEnd(); 728 729 // Install the protected region if we are doing implicit overflow checks. 730 if (implicit_stack_check) { 731 // The thread might have protected region at the bottom. We need 732 // to install our own region so we need to move the limits 733 // of the stack to make room for it. 734 735 tlsPtr_.stack_begin += read_guard_size + kStackOverflowProtectedSize; 736 tlsPtr_.stack_end += read_guard_size + kStackOverflowProtectedSize; 737 tlsPtr_.stack_size -= read_guard_size; 738 739 InstallImplicitProtection(); 740 } 741 742 // Sanity check. 743 int stack_variable; 744 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 745 746 return true; 747} 748 749void Thread::ShortDump(std::ostream& os) const { 750 os << "Thread["; 751 if (GetThreadId() != 0) { 752 // If we're in kStarting, we won't have a thin lock id or tid yet. 753 os << GetThreadId() 754 << ",tid=" << GetTid() << ','; 755 } 756 os << GetState() 757 << ",Thread*=" << this 758 << ",peer=" << tlsPtr_.opeer 759 << ",\"" << (tlsPtr_.name != nullptr ? *tlsPtr_.name : "null") << "\"" 760 << "]"; 761} 762 763void Thread::Dump(std::ostream& os) const { 764 DumpState(os); 765 DumpStack(os); 766} 767 768mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 769 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 770 return (tlsPtr_.opeer != nullptr) ? 771 reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 772} 773 774void Thread::GetThreadName(std::string& name) const { 775 name.assign(*tlsPtr_.name); 776} 777 778uint64_t Thread::GetCpuMicroTime() const { 779#if defined(__linux__) 780 clockid_t cpu_clock_id; 781 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 782 timespec now; 783 clock_gettime(cpu_clock_id, &now); 784 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 785#else // __APPLE__ 786 UNIMPLEMENTED(WARNING); 787 return -1; 788#endif 789} 790 791// Attempt to rectify locks so that we dump thread list with required locks before exiting. 792static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 793 LOG(ERROR) << *thread << " suspend count already zero."; 794 Locks::thread_suspend_count_lock_->Unlock(self); 795 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 796 Locks::mutator_lock_->SharedTryLock(self); 797 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 798 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 799 } 800 } 801 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 802 Locks::thread_list_lock_->TryLock(self); 803 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 804 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 805 } 806 } 807 std::ostringstream ss; 808 Runtime::Current()->GetThreadList()->Dump(ss); 809 LOG(FATAL) << ss.str(); 810} 811 812bool Thread::ModifySuspendCount(Thread* self, int delta, AtomicInteger* suspend_barrier, 813 bool for_debugger) { 814 if (kIsDebugBuild) { 815 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 816 << delta << " " << tls32_.debug_suspend_count << " " << this; 817 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 818 Locks::thread_suspend_count_lock_->AssertHeld(self); 819 if (this != self && !IsSuspended()) { 820 Locks::thread_list_lock_->AssertHeld(self); 821 } 822 } 823 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 824 UnsafeLogFatalForSuspendCount(self, this); 825 return false; 826 } 827 828 uint16_t flags = kSuspendRequest; 829 if (delta > 0 && suspend_barrier != nullptr) { 830 uint32_t available_barrier = kMaxSuspendBarriers; 831 for (uint32_t i = 0; i < kMaxSuspendBarriers; ++i) { 832 if (tlsPtr_.active_suspend_barriers[i] == nullptr) { 833 available_barrier = i; 834 break; 835 } 836 } 837 if (available_barrier == kMaxSuspendBarriers) { 838 // No barrier spaces available, we can't add another. 839 return false; 840 } 841 tlsPtr_.active_suspend_barriers[available_barrier] = suspend_barrier; 842 flags |= kActiveSuspendBarrier; 843 } 844 845 tls32_.suspend_count += delta; 846 if (for_debugger) { 847 tls32_.debug_suspend_count += delta; 848 } 849 850 if (tls32_.suspend_count == 0) { 851 AtomicClearFlag(kSuspendRequest); 852 } else { 853 // Two bits might be set simultaneously. 854 tls32_.state_and_flags.as_atomic_int.FetchAndOrSequentiallyConsistent(flags); 855 TriggerSuspend(); 856 } 857 return true; 858} 859 860bool Thread::PassActiveSuspendBarriers(Thread* self) { 861 // Grab the suspend_count lock and copy the current set of 862 // barriers. Then clear the list and the flag. The ModifySuspendCount 863 // function requires the lock so we prevent a race between setting 864 // the kActiveSuspendBarrier flag and clearing it. 865 AtomicInteger* pass_barriers[kMaxSuspendBarriers]; 866 { 867 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 868 if (!ReadFlag(kActiveSuspendBarrier)) { 869 // quick exit test: the barriers have already been claimed - this is 870 // possible as there may be a race to claim and it doesn't matter 871 // who wins. 872 // All of the callers of this function (except the SuspendAllInternal) 873 // will first test the kActiveSuspendBarrier flag without lock. Here 874 // double-check whether the barrier has been passed with the 875 // suspend_count lock. 876 return false; 877 } 878 879 for (uint32_t i = 0; i < kMaxSuspendBarriers; ++i) { 880 pass_barriers[i] = tlsPtr_.active_suspend_barriers[i]; 881 tlsPtr_.active_suspend_barriers[i] = nullptr; 882 } 883 AtomicClearFlag(kActiveSuspendBarrier); 884 } 885 886 uint32_t barrier_count = 0; 887 for (uint32_t i = 0; i < kMaxSuspendBarriers; i++) { 888 AtomicInteger* pending_threads = pass_barriers[i]; 889 if (pending_threads != nullptr) { 890 bool done = false; 891 do { 892 int32_t cur_val = pending_threads->LoadRelaxed(); 893 CHECK_GT(cur_val, 0) << "Unexpected value for PassActiveSuspendBarriers(): " << cur_val; 894 // Reduce value by 1. 895 done = pending_threads->CompareExchangeWeakRelaxed(cur_val, cur_val - 1); 896#if ART_USE_FUTEXES 897 if (done && (cur_val - 1) == 0) { // Weak CAS may fail spuriously. 898 futex(pending_threads->Address(), FUTEX_WAKE, -1, nullptr, nullptr, 0); 899 } 900#endif 901 } while (!done); 902 ++barrier_count; 903 } 904 } 905 CHECK_GT(barrier_count, 0U); 906 return true; 907} 908 909void Thread::ClearSuspendBarrier(AtomicInteger* target) { 910 CHECK(ReadFlag(kActiveSuspendBarrier)); 911 bool clear_flag = true; 912 for (uint32_t i = 0; i < kMaxSuspendBarriers; ++i) { 913 AtomicInteger* ptr = tlsPtr_.active_suspend_barriers[i]; 914 if (ptr == target) { 915 tlsPtr_.active_suspend_barriers[i] = nullptr; 916 } else if (ptr != nullptr) { 917 clear_flag = false; 918 } 919 } 920 if (LIKELY(clear_flag)) { 921 AtomicClearFlag(kActiveSuspendBarrier); 922 } 923} 924 925void Thread::RunCheckpointFunction() { 926 Closure *checkpoints[kMaxCheckpoints]; 927 928 // Grab the suspend_count lock and copy the current set of 929 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 930 // function will also grab this lock so we prevent a race between setting 931 // the kCheckpointRequest flag and clearing it. 932 { 933 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 934 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 935 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 936 tlsPtr_.checkpoint_functions[i] = nullptr; 937 } 938 AtomicClearFlag(kCheckpointRequest); 939 } 940 941 // Outside the lock, run all the checkpoint functions that 942 // we collected. 943 bool found_checkpoint = false; 944 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 945 if (checkpoints[i] != nullptr) { 946 ATRACE_BEGIN("Checkpoint function"); 947 checkpoints[i]->Run(this); 948 ATRACE_END(); 949 found_checkpoint = true; 950 } 951 } 952 CHECK(found_checkpoint); 953} 954 955bool Thread::RequestCheckpoint(Closure* function) { 956 union StateAndFlags old_state_and_flags; 957 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 958 if (old_state_and_flags.as_struct.state != kRunnable) { 959 return false; // Fail, thread is suspended and so can't run a checkpoint. 960 } 961 962 uint32_t available_checkpoint = kMaxCheckpoints; 963 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 964 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 965 available_checkpoint = i; 966 break; 967 } 968 } 969 if (available_checkpoint == kMaxCheckpoints) { 970 // No checkpoint functions available, we can't run a checkpoint 971 return false; 972 } 973 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 974 975 // Checkpoint function installed now install flag bit. 976 // We must be runnable to request a checkpoint. 977 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 978 union StateAndFlags new_state_and_flags; 979 new_state_and_flags.as_int = old_state_and_flags.as_int; 980 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 981 bool success = tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent( 982 old_state_and_flags.as_int, new_state_and_flags.as_int); 983 if (UNLIKELY(!success)) { 984 // The thread changed state before the checkpoint was installed. 985 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 986 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 987 } else { 988 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 989 TriggerSuspend(); 990 } 991 return success; 992} 993 994Closure* Thread::GetFlipFunction() { 995 Atomic<Closure*>* atomic_func = reinterpret_cast<Atomic<Closure*>*>(&tlsPtr_.flip_function); 996 Closure* func; 997 do { 998 func = atomic_func->LoadRelaxed(); 999 if (func == nullptr) { 1000 return nullptr; 1001 } 1002 } while (!atomic_func->CompareExchangeWeakSequentiallyConsistent(func, nullptr)); 1003 DCHECK(func != nullptr); 1004 return func; 1005} 1006 1007void Thread::SetFlipFunction(Closure* function) { 1008 CHECK(function != nullptr); 1009 Atomic<Closure*>* atomic_func = reinterpret_cast<Atomic<Closure*>*>(&tlsPtr_.flip_function); 1010 atomic_func->StoreSequentiallyConsistent(function); 1011} 1012 1013void Thread::FullSuspendCheck() { 1014 VLOG(threads) << this << " self-suspending"; 1015 ATRACE_BEGIN("Full suspend check"); 1016 // Make thread appear suspended to other threads, release mutator_lock_. 1017 tls32_.suspended_at_suspend_check = true; 1018 TransitionFromRunnableToSuspended(kSuspended); 1019 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 1020 TransitionFromSuspendedToRunnable(); 1021 tls32_.suspended_at_suspend_check = false; 1022 ATRACE_END(); 1023 VLOG(threads) << this << " self-reviving"; 1024} 1025 1026void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 1027 std::string group_name; 1028 int priority; 1029 bool is_daemon = false; 1030 Thread* self = Thread::Current(); 1031 1032 // If flip_function is not null, it means we have run a checkpoint 1033 // before the thread wakes up to execute the flip function and the 1034 // thread roots haven't been forwarded. So the following access to 1035 // the roots (opeer or methods in the frames) would be bad. Run it 1036 // here. TODO: clean up. 1037 if (thread != nullptr) { 1038 ScopedObjectAccessUnchecked soa(self); 1039 Thread* this_thread = const_cast<Thread*>(thread); 1040 Closure* flip_func = this_thread->GetFlipFunction(); 1041 if (flip_func != nullptr) { 1042 flip_func->Run(this_thread); 1043 } 1044 } 1045 1046 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 1047 // cause ScopedObjectAccessUnchecked to deadlock. 1048 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 1049 ScopedObjectAccessUnchecked soa(self); 1050 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 1051 ->GetInt(thread->tlsPtr_.opeer); 1052 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 1053 ->GetBoolean(thread->tlsPtr_.opeer); 1054 1055 mirror::Object* thread_group = 1056 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 1057 1058 if (thread_group != nullptr) { 1059 ArtField* group_name_field = 1060 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 1061 mirror::String* group_name_string = 1062 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 1063 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 1064 } 1065 } else { 1066 priority = GetNativePriority(); 1067 } 1068 1069 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 1070 if (scheduler_group_name.empty()) { 1071 scheduler_group_name = "default"; 1072 } 1073 1074 if (thread != nullptr) { 1075 os << '"' << *thread->tlsPtr_.name << '"'; 1076 if (is_daemon) { 1077 os << " daemon"; 1078 } 1079 os << " prio=" << priority 1080 << " tid=" << thread->GetThreadId() 1081 << " " << thread->GetState(); 1082 if (thread->IsStillStarting()) { 1083 os << " (still starting up)"; 1084 } 1085 os << "\n"; 1086 } else { 1087 os << '"' << ::art::GetThreadName(tid) << '"' 1088 << " prio=" << priority 1089 << " (not attached)\n"; 1090 } 1091 1092 if (thread != nullptr) { 1093 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 1094 os << " | group=\"" << group_name << "\"" 1095 << " sCount=" << thread->tls32_.suspend_count 1096 << " dsCount=" << thread->tls32_.debug_suspend_count 1097 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 1098 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 1099 } 1100 1101 os << " | sysTid=" << tid 1102 << " nice=" << getpriority(PRIO_PROCESS, tid) 1103 << " cgrp=" << scheduler_group_name; 1104 if (thread != nullptr) { 1105 int policy; 1106 sched_param sp; 1107 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 1108 __FUNCTION__); 1109 os << " sched=" << policy << "/" << sp.sched_priority 1110 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 1111 } 1112 os << "\n"; 1113 1114 // Grab the scheduler stats for this thread. 1115 std::string scheduler_stats; 1116 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 1117 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 1118 } else { 1119 scheduler_stats = "0 0 0"; 1120 } 1121 1122 char native_thread_state = '?'; 1123 int utime = 0; 1124 int stime = 0; 1125 int task_cpu = 0; 1126 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 1127 1128 os << " | state=" << native_thread_state 1129 << " schedstat=( " << scheduler_stats << " )" 1130 << " utm=" << utime 1131 << " stm=" << stime 1132 << " core=" << task_cpu 1133 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 1134 if (thread != nullptr) { 1135 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 1136 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 1137 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 1138 // Dump the held mutexes. 1139 os << " | held mutexes="; 1140 for (size_t i = 0; i < kLockLevelCount; ++i) { 1141 if (i != kMonitorLock) { 1142 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 1143 if (mutex != nullptr) { 1144 os << " \"" << mutex->GetName() << "\""; 1145 if (mutex->IsReaderWriterMutex()) { 1146 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 1147 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 1148 os << "(exclusive held)"; 1149 } else { 1150 os << "(shared held)"; 1151 } 1152 } 1153 } 1154 } 1155 } 1156 os << "\n"; 1157 } 1158} 1159 1160void Thread::DumpState(std::ostream& os) const { 1161 Thread::DumpState(os, this, GetTid()); 1162} 1163 1164struct StackDumpVisitor : public StackVisitor { 1165 StackDumpVisitor(std::ostream& os_in, Thread* thread_in, Context* context, bool can_allocate_in) 1166 SHARED_REQUIRES(Locks::mutator_lock_) 1167 : StackVisitor(thread_in, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1168 os(os_in), 1169 thread(thread_in), 1170 can_allocate(can_allocate_in), 1171 last_method(nullptr), 1172 last_line_number(0), 1173 repetition_count(0), 1174 frame_count(0) {} 1175 1176 virtual ~StackDumpVisitor() { 1177 if (frame_count == 0) { 1178 os << " (no managed stack frames)\n"; 1179 } 1180 } 1181 1182 bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 1183 ArtMethod* m = GetMethod(); 1184 if (m->IsRuntimeMethod()) { 1185 return true; 1186 } 1187 m = m->GetInterfaceMethodIfProxy(sizeof(void*)); 1188 const int kMaxRepetition = 3; 1189 mirror::Class* c = m->GetDeclaringClass(); 1190 mirror::DexCache* dex_cache = c->GetDexCache(); 1191 int line_number = -1; 1192 if (dex_cache != nullptr) { // be tolerant of bad input 1193 const DexFile& dex_file = *dex_cache->GetDexFile(); 1194 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 1195 } 1196 if (line_number == last_line_number && last_method == m) { 1197 ++repetition_count; 1198 } else { 1199 if (repetition_count >= kMaxRepetition) { 1200 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 1201 } 1202 repetition_count = 0; 1203 last_line_number = line_number; 1204 last_method = m; 1205 } 1206 if (repetition_count < kMaxRepetition) { 1207 os << " at " << PrettyMethod(m, false); 1208 if (m->IsNative()) { 1209 os << "(Native method)"; 1210 } else { 1211 const char* source_file(m->GetDeclaringClassSourceFile()); 1212 os << "(" << (source_file != nullptr ? source_file : "unavailable") 1213 << ":" << line_number << ")"; 1214 } 1215 os << "\n"; 1216 if (frame_count == 0) { 1217 Monitor::DescribeWait(os, thread); 1218 } 1219 if (can_allocate) { 1220 // Visit locks, but do not abort on errors. This would trigger a nested abort. 1221 Monitor::VisitLocks(this, DumpLockedObject, &os, false); 1222 } 1223 } 1224 1225 ++frame_count; 1226 return true; 1227 } 1228 1229 static void DumpLockedObject(mirror::Object* o, void* context) 1230 SHARED_REQUIRES(Locks::mutator_lock_) { 1231 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 1232 os << " - locked "; 1233 if (o == nullptr) { 1234 os << "an unknown object"; 1235 } else { 1236 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 1237 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 1238 // Getting the identity hashcode here would result in lock inflation and suspension of the 1239 // current thread, which isn't safe if this is the only runnable thread. 1240 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 1241 PrettyTypeOf(o).c_str()); 1242 } else { 1243 // IdentityHashCode can cause thread suspension, which would invalidate o if it moved. So 1244 // we get the pretty type beofre we call IdentityHashCode. 1245 const std::string pretty_type(PrettyTypeOf(o)); 1246 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), pretty_type.c_str()); 1247 } 1248 } 1249 os << "\n"; 1250 } 1251 1252 std::ostream& os; 1253 const Thread* thread; 1254 const bool can_allocate; 1255 ArtMethod* last_method; 1256 int last_line_number; 1257 int repetition_count; 1258 int frame_count; 1259}; 1260 1261static bool ShouldShowNativeStack(const Thread* thread) 1262 SHARED_REQUIRES(Locks::mutator_lock_) { 1263 ThreadState state = thread->GetState(); 1264 1265 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 1266 if (state > kWaiting && state < kStarting) { 1267 return true; 1268 } 1269 1270 // In an Object.wait variant or Thread.sleep? That's not interesting. 1271 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 1272 return false; 1273 } 1274 1275 // Threads with no managed stack frames should be shown. 1276 const ManagedStack* managed_stack = thread->GetManagedStack(); 1277 if (managed_stack == nullptr || (managed_stack->GetTopQuickFrame() == nullptr && 1278 managed_stack->GetTopShadowFrame() == nullptr)) { 1279 return true; 1280 } 1281 1282 // In some other native method? That's interesting. 1283 // We don't just check kNative because native methods will be in state kSuspended if they're 1284 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 1285 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 1286 ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 1287 return current_method != nullptr && current_method->IsNative(); 1288} 1289 1290void Thread::DumpJavaStack(std::ostream& os) const { 1291 // If flip_function is not null, it means we have run a checkpoint 1292 // before the thread wakes up to execute the flip function and the 1293 // thread roots haven't been forwarded. So the following access to 1294 // the roots (locks or methods in the frames) would be bad. Run it 1295 // here. TODO: clean up. 1296 { 1297 Thread* this_thread = const_cast<Thread*>(this); 1298 Closure* flip_func = this_thread->GetFlipFunction(); 1299 if (flip_func != nullptr) { 1300 flip_func->Run(this_thread); 1301 } 1302 } 1303 1304 // Dumping the Java stack involves the verifier for locks. The verifier operates under the 1305 // assumption that there is no exception pending on entry. Thus, stash any pending exception. 1306 // Thread::Current() instead of this in case a thread is dumping the stack of another suspended 1307 // thread. 1308 StackHandleScope<1> scope(Thread::Current()); 1309 Handle<mirror::Throwable> exc; 1310 bool have_exception = false; 1311 if (IsExceptionPending()) { 1312 exc = scope.NewHandle(GetException()); 1313 const_cast<Thread*>(this)->ClearException(); 1314 have_exception = true; 1315 } 1316 1317 std::unique_ptr<Context> context(Context::Create()); 1318 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 1319 !tls32_.throwing_OutOfMemoryError); 1320 dumper.WalkStack(); 1321 1322 if (have_exception) { 1323 const_cast<Thread*>(this)->SetException(exc.Get()); 1324 } 1325} 1326 1327void Thread::DumpStack(std::ostream& os) const { 1328 // TODO: we call this code when dying but may not have suspended the thread ourself. The 1329 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 1330 // the race with the thread_suspend_count_lock_). 1331 bool dump_for_abort = (gAborting > 0); 1332 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 1333 if (!kIsDebugBuild) { 1334 // We always want to dump the stack for an abort, however, there is no point dumping another 1335 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 1336 safe_to_dump = (safe_to_dump || dump_for_abort); 1337 } 1338 if (safe_to_dump) { 1339 // If we're currently in native code, dump that stack before dumping the managed stack. 1340 if (dump_for_abort || ShouldShowNativeStack(this)) { 1341 DumpKernelStack(os, GetTid(), " kernel: ", false); 1342 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr, !dump_for_abort)); 1343 } 1344 DumpJavaStack(os); 1345 } else { 1346 os << "Not able to dump stack of thread that isn't suspended"; 1347 } 1348} 1349 1350void Thread::ThreadExitCallback(void* arg) { 1351 Thread* self = reinterpret_cast<Thread*>(arg); 1352 if (self->tls32_.thread_exit_check_count == 0) { 1353 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1354 "going to use a pthread_key_create destructor?): " << *self; 1355 CHECK(is_started_); 1356#ifdef __ANDROID__ 1357 __get_tls()[TLS_SLOT_ART_THREAD_SELF] = self; 1358#else 1359 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1360#endif 1361 self->tls32_.thread_exit_check_count = 1; 1362 } else { 1363 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1364 } 1365} 1366 1367void Thread::Startup() { 1368 CHECK(!is_started_); 1369 is_started_ = true; 1370 { 1371 // MutexLock to keep annotalysis happy. 1372 // 1373 // Note we use null for the thread because Thread::Current can 1374 // return garbage since (is_started_ == true) and 1375 // Thread::pthread_key_self_ is not yet initialized. 1376 // This was seen on glibc. 1377 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1378 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1379 *Locks::thread_suspend_count_lock_); 1380 } 1381 1382 // Allocate a TLS slot. 1383 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), 1384 "self key"); 1385 1386 // Double-check the TLS slot allocation. 1387 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1388 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1389 } 1390} 1391 1392void Thread::FinishStartup() { 1393 Runtime* runtime = Runtime::Current(); 1394 CHECK(runtime->IsStarted()); 1395 1396 // Finish attaching the main thread. 1397 ScopedObjectAccess soa(Thread::Current()); 1398 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1399 1400 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1401} 1402 1403void Thread::Shutdown() { 1404 CHECK(is_started_); 1405 is_started_ = false; 1406 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1407 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1408 if (resume_cond_ != nullptr) { 1409 delete resume_cond_; 1410 resume_cond_ = nullptr; 1411 } 1412} 1413 1414Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1415 wait_mutex_ = new Mutex("a thread wait mutex"); 1416 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1417 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1418 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1419 tlsPtr_.nested_signal_state = static_cast<jmp_buf*>(malloc(sizeof(jmp_buf))); 1420 1421 static_assert((sizeof(Thread) % 4) == 0U, 1422 "art::Thread has a size which is not a multiple of 4."); 1423 tls32_.state_and_flags.as_struct.flags = 0; 1424 tls32_.state_and_flags.as_struct.state = kNative; 1425 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1426 std::fill(tlsPtr_.rosalloc_runs, 1427 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1428 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1429 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1430 tlsPtr_.checkpoint_functions[i] = nullptr; 1431 } 1432 for (uint32_t i = 0; i < kMaxSuspendBarriers; ++i) { 1433 tlsPtr_.active_suspend_barriers[i] = nullptr; 1434 } 1435 tlsPtr_.flip_function = nullptr; 1436 tlsPtr_.thread_local_mark_stack = nullptr; 1437 tls32_.suspended_at_suspend_check = false; 1438} 1439 1440bool Thread::IsStillStarting() const { 1441 // You might think you can check whether the state is kStarting, but for much of thread startup, 1442 // the thread is in kNative; it might also be in kVmWait. 1443 // You might think you can check whether the peer is null, but the peer is actually created and 1444 // assigned fairly early on, and needs to be. 1445 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1446 // this thread _ever_ entered kRunnable". 1447 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1448 (*tlsPtr_.name == kThreadNameDuringStartup); 1449} 1450 1451void Thread::AssertPendingException() const { 1452 CHECK(IsExceptionPending()) << "Pending exception expected."; 1453} 1454 1455void Thread::AssertPendingOOMException() const { 1456 AssertPendingException(); 1457 auto* e = GetException(); 1458 CHECK_EQ(e->GetClass(), DecodeJObject(WellKnownClasses::java_lang_OutOfMemoryError)->AsClass()) 1459 << e->Dump(); 1460} 1461 1462void Thread::AssertNoPendingException() const { 1463 if (UNLIKELY(IsExceptionPending())) { 1464 ScopedObjectAccess soa(Thread::Current()); 1465 mirror::Throwable* exception = GetException(); 1466 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1467 } 1468} 1469 1470void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1471 if (UNLIKELY(IsExceptionPending())) { 1472 ScopedObjectAccess soa(Thread::Current()); 1473 mirror::Throwable* exception = GetException(); 1474 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1475 << exception->Dump(); 1476 } 1477} 1478 1479class MonitorExitVisitor : public SingleRootVisitor { 1480 public: 1481 explicit MonitorExitVisitor(Thread* self) : self_(self) { } 1482 1483 // NO_THREAD_SAFETY_ANALYSIS due to MonitorExit. 1484 void VisitRoot(mirror::Object* entered_monitor, const RootInfo& info ATTRIBUTE_UNUSED) 1485 OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 1486 if (self_->HoldsLock(entered_monitor)) { 1487 LOG(WARNING) << "Calling MonitorExit on object " 1488 << entered_monitor << " (" << PrettyTypeOf(entered_monitor) << ")" 1489 << " left locked by native thread " 1490 << *Thread::Current() << " which is detaching"; 1491 entered_monitor->MonitorExit(self_); 1492 } 1493 } 1494 1495 private: 1496 Thread* const self_; 1497}; 1498 1499void Thread::Destroy() { 1500 Thread* self = this; 1501 DCHECK_EQ(self, Thread::Current()); 1502 1503 if (tlsPtr_.jni_env != nullptr) { 1504 { 1505 ScopedObjectAccess soa(self); 1506 MonitorExitVisitor visitor(self); 1507 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1508 tlsPtr_.jni_env->monitors.VisitRoots(&visitor, RootInfo(kRootVMInternal)); 1509 } 1510 // Release locally held global references which releasing may require the mutator lock. 1511 if (tlsPtr_.jpeer != nullptr) { 1512 // If pthread_create fails we don't have a jni env here. 1513 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1514 tlsPtr_.jpeer = nullptr; 1515 } 1516 if (tlsPtr_.class_loader_override != nullptr) { 1517 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.class_loader_override); 1518 tlsPtr_.class_loader_override = nullptr; 1519 } 1520 } 1521 1522 if (tlsPtr_.opeer != nullptr) { 1523 ScopedObjectAccess soa(self); 1524 // We may need to call user-supplied managed code, do this before final clean-up. 1525 HandleUncaughtExceptions(soa); 1526 RemoveFromThreadGroup(soa); 1527 1528 // this.nativePeer = 0; 1529 if (Runtime::Current()->IsActiveTransaction()) { 1530 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1531 ->SetLong<true>(tlsPtr_.opeer, 0); 1532 } else { 1533 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1534 ->SetLong<false>(tlsPtr_.opeer, 0); 1535 } 1536 Dbg::PostThreadDeath(self); 1537 1538 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1539 // who is waiting. 1540 mirror::Object* lock = 1541 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1542 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1543 if (lock != nullptr) { 1544 StackHandleScope<1> hs(self); 1545 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1546 ObjectLock<mirror::Object> locker(self, h_obj); 1547 locker.NotifyAll(); 1548 } 1549 tlsPtr_.opeer = nullptr; 1550 } 1551 1552 { 1553 ScopedObjectAccess soa(self); 1554 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1555 if (kUseReadBarrier) { 1556 Runtime::Current()->GetHeap()->ConcurrentCopyingCollector()->RevokeThreadLocalMarkStack(this); 1557 } 1558 } 1559} 1560 1561Thread::~Thread() { 1562 CHECK(tlsPtr_.class_loader_override == nullptr); 1563 CHECK(tlsPtr_.jpeer == nullptr); 1564 CHECK(tlsPtr_.opeer == nullptr); 1565 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1566 if (initialized) { 1567 delete tlsPtr_.jni_env; 1568 tlsPtr_.jni_env = nullptr; 1569 } 1570 CHECK_NE(GetState(), kRunnable); 1571 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1572 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1573 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1574 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1575 CHECK(tlsPtr_.flip_function == nullptr); 1576 CHECK_EQ(tls32_.suspended_at_suspend_check, false); 1577 1578 // We may be deleting a still born thread. 1579 SetStateUnsafe(kTerminated); 1580 1581 delete wait_cond_; 1582 delete wait_mutex_; 1583 1584 if (tlsPtr_.long_jump_context != nullptr) { 1585 delete tlsPtr_.long_jump_context; 1586 } 1587 1588 if (initialized) { 1589 CleanupCpu(); 1590 } 1591 1592 if (tlsPtr_.single_step_control != nullptr) { 1593 delete tlsPtr_.single_step_control; 1594 } 1595 delete tlsPtr_.instrumentation_stack; 1596 delete tlsPtr_.name; 1597 delete tlsPtr_.stack_trace_sample; 1598 free(tlsPtr_.nested_signal_state); 1599 1600 Runtime::Current()->GetHeap()->AssertThreadLocalBuffersAreRevoked(this); 1601 1602 TearDownAlternateSignalStack(); 1603} 1604 1605void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1606 if (!IsExceptionPending()) { 1607 return; 1608 } 1609 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1610 ScopedThreadStateChange tsc(this, kNative); 1611 1612 // Get and clear the exception. 1613 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1614 tlsPtr_.jni_env->ExceptionClear(); 1615 1616 // If the thread has its own handler, use that. 1617 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1618 tlsPtr_.jni_env->GetObjectField(peer.get(), 1619 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1620 if (handler.get() == nullptr) { 1621 // Otherwise use the thread group's default handler. 1622 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1623 WellKnownClasses::java_lang_Thread_group)); 1624 } 1625 1626 // Call the handler. 1627 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1628 WellKnownClasses::java_lang_Thread__UncaughtExceptionHandler_uncaughtException, 1629 peer.get(), exception.get()); 1630 1631 // If the handler threw, clear that exception too. 1632 tlsPtr_.jni_env->ExceptionClear(); 1633} 1634 1635void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1636 // this.group.removeThread(this); 1637 // group can be null if we're in the compiler or a test. 1638 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1639 ->GetObject(tlsPtr_.opeer); 1640 if (ogroup != nullptr) { 1641 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1642 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1643 ScopedThreadStateChange tsc(soa.Self(), kNative); 1644 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1645 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1646 peer.get()); 1647 } 1648} 1649 1650size_t Thread::NumHandleReferences() { 1651 size_t count = 0; 1652 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur != nullptr; cur = cur->GetLink()) { 1653 count += cur->NumberOfReferences(); 1654 } 1655 return count; 1656} 1657 1658bool Thread::HandleScopeContains(jobject obj) const { 1659 StackReference<mirror::Object>* hs_entry = 1660 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1661 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur!= nullptr; cur = cur->GetLink()) { 1662 if (cur->Contains(hs_entry)) { 1663 return true; 1664 } 1665 } 1666 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1667 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1668} 1669 1670void Thread::HandleScopeVisitRoots(RootVisitor* visitor, uint32_t thread_id) { 1671 BufferedRootVisitor<kDefaultBufferedRootCount> buffered_visitor( 1672 visitor, RootInfo(kRootNativeStack, thread_id)); 1673 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1674 for (size_t j = 0, count = cur->NumberOfReferences(); j < count; ++j) { 1675 // GetReference returns a pointer to the stack reference within the handle scope. If this 1676 // needs to be updated, it will be done by the root visitor. 1677 buffered_visitor.VisitRootIfNonNull(cur->GetHandle(j).GetReference()); 1678 } 1679 } 1680} 1681 1682mirror::Object* Thread::DecodeJObject(jobject obj) const { 1683 if (obj == nullptr) { 1684 return nullptr; 1685 } 1686 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1687 IndirectRefKind kind = GetIndirectRefKind(ref); 1688 mirror::Object* result; 1689 bool expect_null = false; 1690 // The "kinds" below are sorted by the frequency we expect to encounter them. 1691 if (kind == kLocal) { 1692 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1693 // Local references do not need a read barrier. 1694 result = locals.Get<kWithoutReadBarrier>(ref); 1695 } else if (kind == kHandleScopeOrInvalid) { 1696 // TODO: make stack indirect reference table lookup more efficient. 1697 // Check if this is a local reference in the handle scope. 1698 if (LIKELY(HandleScopeContains(obj))) { 1699 // Read from handle scope. 1700 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1701 VerifyObject(result); 1702 } else { 1703 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of invalid jobject %p", obj); 1704 expect_null = true; 1705 result = nullptr; 1706 } 1707 } else if (kind == kGlobal) { 1708 result = tlsPtr_.jni_env->vm->DecodeGlobal(const_cast<Thread*>(this), ref); 1709 } else { 1710 DCHECK_EQ(kind, kWeakGlobal); 1711 result = tlsPtr_.jni_env->vm->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1712 if (Runtime::Current()->IsClearedJniWeakGlobal(result)) { 1713 // This is a special case where it's okay to return null. 1714 expect_null = true; 1715 result = nullptr; 1716 } 1717 } 1718 1719 if (UNLIKELY(!expect_null && result == nullptr)) { 1720 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of deleted %s %p", 1721 ToStr<IndirectRefKind>(kind).c_str(), obj); 1722 } 1723 return result; 1724} 1725 1726// Implements java.lang.Thread.interrupted. 1727bool Thread::Interrupted() { 1728 MutexLock mu(Thread::Current(), *wait_mutex_); 1729 bool interrupted = IsInterruptedLocked(); 1730 SetInterruptedLocked(false); 1731 return interrupted; 1732} 1733 1734// Implements java.lang.Thread.isInterrupted. 1735bool Thread::IsInterrupted() { 1736 MutexLock mu(Thread::Current(), *wait_mutex_); 1737 return IsInterruptedLocked(); 1738} 1739 1740void Thread::Interrupt(Thread* self) { 1741 MutexLock mu(self, *wait_mutex_); 1742 if (interrupted_) { 1743 return; 1744 } 1745 interrupted_ = true; 1746 NotifyLocked(self); 1747} 1748 1749void Thread::Notify() { 1750 Thread* self = Thread::Current(); 1751 MutexLock mu(self, *wait_mutex_); 1752 NotifyLocked(self); 1753} 1754 1755void Thread::NotifyLocked(Thread* self) { 1756 if (wait_monitor_ != nullptr) { 1757 wait_cond_->Signal(self); 1758 } 1759} 1760 1761void Thread::SetClassLoaderOverride(jobject class_loader_override) { 1762 if (tlsPtr_.class_loader_override != nullptr) { 1763 GetJniEnv()->DeleteGlobalRef(tlsPtr_.class_loader_override); 1764 } 1765 tlsPtr_.class_loader_override = GetJniEnv()->NewGlobalRef(class_loader_override); 1766} 1767 1768class CountStackDepthVisitor : public StackVisitor { 1769 public: 1770 explicit CountStackDepthVisitor(Thread* thread) 1771 SHARED_REQUIRES(Locks::mutator_lock_) 1772 : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1773 depth_(0), skip_depth_(0), skipping_(true) {} 1774 1775 bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 1776 // We want to skip frames up to and including the exception's constructor. 1777 // Note we also skip the frame if it doesn't have a method (namely the callee 1778 // save frame) 1779 ArtMethod* m = GetMethod(); 1780 if (skipping_ && !m->IsRuntimeMethod() && 1781 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1782 skipping_ = false; 1783 } 1784 if (!skipping_) { 1785 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1786 ++depth_; 1787 } 1788 } else { 1789 ++skip_depth_; 1790 } 1791 return true; 1792 } 1793 1794 int GetDepth() const { 1795 return depth_; 1796 } 1797 1798 int GetSkipDepth() const { 1799 return skip_depth_; 1800 } 1801 1802 private: 1803 uint32_t depth_; 1804 uint32_t skip_depth_; 1805 bool skipping_; 1806}; 1807 1808template<bool kTransactionActive> 1809class BuildInternalStackTraceVisitor : public StackVisitor { 1810 public: 1811 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1812 : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1813 self_(self), 1814 skip_depth_(skip_depth), 1815 count_(0), 1816 trace_(nullptr), 1817 pointer_size_(Runtime::Current()->GetClassLinker()->GetImagePointerSize()) {} 1818 1819 bool Init(int depth) SHARED_REQUIRES(Locks::mutator_lock_) ACQUIRE(Roles::uninterruptible_) { 1820 // Allocate method trace with format [method pointers][pcs]. 1821 auto* cl = Runtime::Current()->GetClassLinker(); 1822 trace_ = cl->AllocPointerArray(self_, depth * 2); 1823 const char* last_no_suspend_cause = 1824 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1825 if (trace_ == nullptr) { 1826 self_->AssertPendingOOMException(); 1827 return false; 1828 } 1829 // If We are called from native, use non-transactional mode. 1830 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1831 return true; 1832 } 1833 1834 virtual ~BuildInternalStackTraceVisitor() RELEASE(Roles::uninterruptible_) { 1835 self_->EndAssertNoThreadSuspension(nullptr); 1836 } 1837 1838 bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 1839 if (trace_ == nullptr) { 1840 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1841 } 1842 if (skip_depth_ > 0) { 1843 skip_depth_--; 1844 return true; 1845 } 1846 ArtMethod* m = GetMethod(); 1847 if (m->IsRuntimeMethod()) { 1848 return true; // Ignore runtime frames (in particular callee save). 1849 } 1850 trace_->SetElementPtrSize<kTransactionActive>( 1851 count_, m, pointer_size_); 1852 trace_->SetElementPtrSize<kTransactionActive>( 1853 trace_->GetLength() / 2 + count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc(), 1854 pointer_size_); 1855 ++count_; 1856 return true; 1857 } 1858 1859 mirror::PointerArray* GetInternalStackTrace() const { 1860 return trace_; 1861 } 1862 1863 private: 1864 Thread* const self_; 1865 // How many more frames to skip. 1866 int32_t skip_depth_; 1867 // Current position down stack trace. 1868 uint32_t count_; 1869 // An array of the methods on the stack, the last entries are the dex PCs. 1870 mirror::PointerArray* trace_; 1871 // For cross compilation. 1872 size_t pointer_size_; 1873}; 1874 1875template<bool kTransactionActive> 1876jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1877 // Compute depth of stack 1878 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1879 count_visitor.WalkStack(); 1880 int32_t depth = count_visitor.GetDepth(); 1881 int32_t skip_depth = count_visitor.GetSkipDepth(); 1882 1883 // Build internal stack trace. 1884 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1885 const_cast<Thread*>(this), 1886 skip_depth); 1887 if (!build_trace_visitor.Init(depth)) { 1888 return nullptr; // Allocation failed. 1889 } 1890 build_trace_visitor.WalkStack(); 1891 mirror::PointerArray* trace = build_trace_visitor.GetInternalStackTrace(); 1892 if (kIsDebugBuild) { 1893 // Second half is dex PCs. 1894 for (uint32_t i = 0; i < static_cast<uint32_t>(trace->GetLength() / 2); ++i) { 1895 auto* method = trace->GetElementPtrSize<ArtMethod*>( 1896 i, Runtime::Current()->GetClassLinker()->GetImagePointerSize()); 1897 CHECK(method != nullptr); 1898 } 1899 } 1900 return soa.AddLocalReference<jobject>(trace); 1901} 1902template jobject Thread::CreateInternalStackTrace<false>( 1903 const ScopedObjectAccessAlreadyRunnable& soa) const; 1904template jobject Thread::CreateInternalStackTrace<true>( 1905 const ScopedObjectAccessAlreadyRunnable& soa) const; 1906 1907bool Thread::IsExceptionThrownByCurrentMethod(mirror::Throwable* exception) const { 1908 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1909 count_visitor.WalkStack(); 1910 return count_visitor.GetDepth() == exception->GetStackDepth(); 1911} 1912 1913jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1914 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1915 int* stack_depth) { 1916 // Decode the internal stack trace into the depth, method trace and PC trace 1917 int32_t depth = soa.Decode<mirror::PointerArray*>(internal)->GetLength() / 2; 1918 1919 auto* cl = Runtime::Current()->GetClassLinker(); 1920 1921 jobjectArray result; 1922 1923 if (output_array != nullptr) { 1924 // Reuse the array we were given. 1925 result = output_array; 1926 // ...adjusting the number of frames we'll write to not exceed the array length. 1927 const int32_t traces_length = 1928 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1929 depth = std::min(depth, traces_length); 1930 } else { 1931 // Create java_trace array and place in local reference table 1932 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1933 cl->AllocStackTraceElementArray(soa.Self(), depth); 1934 if (java_traces == nullptr) { 1935 return nullptr; 1936 } 1937 result = soa.AddLocalReference<jobjectArray>(java_traces); 1938 } 1939 1940 if (stack_depth != nullptr) { 1941 *stack_depth = depth; 1942 } 1943 1944 for (int32_t i = 0; i < depth; ++i) { 1945 auto* method_trace = soa.Decode<mirror::PointerArray*>(internal); 1946 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1947 ArtMethod* method = method_trace->GetElementPtrSize<ArtMethod*>(i, sizeof(void*)); 1948 uint32_t dex_pc = method_trace->GetElementPtrSize<uint32_t>( 1949 i + method_trace->GetLength() / 2, sizeof(void*)); 1950 int32_t line_number; 1951 StackHandleScope<3> hs(soa.Self()); 1952 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1953 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1954 if (method->IsProxyMethod()) { 1955 line_number = -1; 1956 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1957 // source_name_object intentionally left null for proxy methods 1958 } else { 1959 line_number = method->GetLineNumFromDexPC(dex_pc); 1960 // Allocate element, potentially triggering GC 1961 // TODO: reuse class_name_object via Class::name_? 1962 const char* descriptor = method->GetDeclaringClassDescriptor(); 1963 CHECK(descriptor != nullptr); 1964 std::string class_name(PrettyDescriptor(descriptor)); 1965 class_name_object.Assign( 1966 mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1967 if (class_name_object.Get() == nullptr) { 1968 soa.Self()->AssertPendingOOMException(); 1969 return nullptr; 1970 } 1971 const char* source_file = method->GetDeclaringClassSourceFile(); 1972 if (source_file != nullptr) { 1973 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1974 if (source_name_object.Get() == nullptr) { 1975 soa.Self()->AssertPendingOOMException(); 1976 return nullptr; 1977 } 1978 } 1979 } 1980 const char* method_name = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetName(); 1981 CHECK(method_name != nullptr); 1982 Handle<mirror::String> method_name_object( 1983 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1984 if (method_name_object.Get() == nullptr) { 1985 return nullptr; 1986 } 1987 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1988 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1989 if (obj == nullptr) { 1990 return nullptr; 1991 } 1992 // We are called from native: use non-transactional mode. 1993 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1994 } 1995 return result; 1996} 1997 1998void Thread::ThrowNewExceptionF(const char* exception_class_descriptor, const char* fmt, ...) { 1999 va_list args; 2000 va_start(args, fmt); 2001 ThrowNewExceptionV(exception_class_descriptor, fmt, args); 2002 va_end(args); 2003} 2004 2005void Thread::ThrowNewExceptionV(const char* exception_class_descriptor, 2006 const char* fmt, va_list ap) { 2007 std::string msg; 2008 StringAppendV(&msg, fmt, ap); 2009 ThrowNewException(exception_class_descriptor, msg.c_str()); 2010} 2011 2012void Thread::ThrowNewException(const char* exception_class_descriptor, 2013 const char* msg) { 2014 // Callers should either clear or call ThrowNewWrappedException. 2015 AssertNoPendingExceptionForNewException(msg); 2016 ThrowNewWrappedException(exception_class_descriptor, msg); 2017} 2018 2019static mirror::ClassLoader* GetCurrentClassLoader(Thread* self) 2020 SHARED_REQUIRES(Locks::mutator_lock_) { 2021 ArtMethod* method = self->GetCurrentMethod(nullptr); 2022 return method != nullptr 2023 ? method->GetDeclaringClass()->GetClassLoader() 2024 : nullptr; 2025} 2026 2027void Thread::ThrowNewWrappedException(const char* exception_class_descriptor, 2028 const char* msg) { 2029 DCHECK_EQ(this, Thread::Current()); 2030 ScopedObjectAccessUnchecked soa(this); 2031 StackHandleScope<3> hs(soa.Self()); 2032 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(GetCurrentClassLoader(soa.Self()))); 2033 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException())); 2034 ClearException(); 2035 Runtime* runtime = Runtime::Current(); 2036 auto* cl = runtime->GetClassLinker(); 2037 Handle<mirror::Class> exception_class( 2038 hs.NewHandle(cl->FindClass(this, exception_class_descriptor, class_loader))); 2039 if (UNLIKELY(exception_class.Get() == nullptr)) { 2040 CHECK(IsExceptionPending()); 2041 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 2042 return; 2043 } 2044 2045 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(soa.Self(), exception_class, true, 2046 true))) { 2047 DCHECK(IsExceptionPending()); 2048 return; 2049 } 2050 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 2051 Handle<mirror::Throwable> exception( 2052 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 2053 2054 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 2055 if (exception.Get() == nullptr) { 2056 SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 2057 return; 2058 } 2059 2060 // Choose an appropriate constructor and set up the arguments. 2061 const char* signature; 2062 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 2063 if (msg != nullptr) { 2064 // Ensure we remember this and the method over the String allocation. 2065 msg_string.reset( 2066 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 2067 if (UNLIKELY(msg_string.get() == nullptr)) { 2068 CHECK(IsExceptionPending()); // OOME. 2069 return; 2070 } 2071 if (cause.get() == nullptr) { 2072 signature = "(Ljava/lang/String;)V"; 2073 } else { 2074 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 2075 } 2076 } else { 2077 if (cause.get() == nullptr) { 2078 signature = "()V"; 2079 } else { 2080 signature = "(Ljava/lang/Throwable;)V"; 2081 } 2082 } 2083 ArtMethod* exception_init_method = 2084 exception_class->FindDeclaredDirectMethod("<init>", signature, cl->GetImagePointerSize()); 2085 2086 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 2087 << PrettyDescriptor(exception_class_descriptor); 2088 2089 if (UNLIKELY(!runtime->IsStarted())) { 2090 // Something is trying to throw an exception without a started runtime, which is the common 2091 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 2092 // the exception fields directly. 2093 if (msg != nullptr) { 2094 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 2095 } 2096 if (cause.get() != nullptr) { 2097 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 2098 } 2099 ScopedLocalRef<jobject> trace(GetJniEnv(), 2100 Runtime::Current()->IsActiveTransaction() 2101 ? CreateInternalStackTrace<true>(soa) 2102 : CreateInternalStackTrace<false>(soa)); 2103 if (trace.get() != nullptr) { 2104 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 2105 } 2106 SetException(exception.Get()); 2107 } else { 2108 jvalue jv_args[2]; 2109 size_t i = 0; 2110 2111 if (msg != nullptr) { 2112 jv_args[i].l = msg_string.get(); 2113 ++i; 2114 } 2115 if (cause.get() != nullptr) { 2116 jv_args[i].l = cause.get(); 2117 ++i; 2118 } 2119 ScopedLocalRef<jobject> ref(soa.Env(), soa.AddLocalReference<jobject>(exception.Get())); 2120 InvokeWithJValues(soa, ref.get(), soa.EncodeMethod(exception_init_method), jv_args); 2121 if (LIKELY(!IsExceptionPending())) { 2122 SetException(exception.Get()); 2123 } 2124 } 2125} 2126 2127void Thread::ThrowOutOfMemoryError(const char* msg) { 2128 LOG(WARNING) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 2129 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 2130 if (!tls32_.throwing_OutOfMemoryError) { 2131 tls32_.throwing_OutOfMemoryError = true; 2132 ThrowNewException("Ljava/lang/OutOfMemoryError;", msg); 2133 tls32_.throwing_OutOfMemoryError = false; 2134 } else { 2135 Dump(LOG(WARNING)); // The pre-allocated OOME has no stack, so help out and log one. 2136 SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 2137 } 2138} 2139 2140Thread* Thread::CurrentFromGdb() { 2141 return Thread::Current(); 2142} 2143 2144void Thread::DumpFromGdb() const { 2145 std::ostringstream ss; 2146 Dump(ss); 2147 std::string str(ss.str()); 2148 // log to stderr for debugging command line processes 2149 std::cerr << str; 2150#ifdef __ANDROID__ 2151 // log to logcat for debugging frameworks processes 2152 LOG(INFO) << str; 2153#endif 2154} 2155 2156// Explicitly instantiate 32 and 64bit thread offset dumping support. 2157template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 2158template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 2159 2160template<size_t ptr_size> 2161void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 2162#define DO_THREAD_OFFSET(x, y) \ 2163 if (offset == x.Uint32Value()) { \ 2164 os << y; \ 2165 return; \ 2166 } 2167 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 2168 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 2169 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 2170 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 2171 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 2172 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 2173 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 2174 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 2175 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 2176 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 2177 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 2178 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 2179#undef DO_THREAD_OFFSET 2180 2181#define INTERPRETER_ENTRY_POINT_INFO(x) \ 2182 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2183 os << #x; \ 2184 return; \ 2185 } 2186 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 2187 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 2188#undef INTERPRETER_ENTRY_POINT_INFO 2189 2190#define JNI_ENTRY_POINT_INFO(x) \ 2191 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2192 os << #x; \ 2193 return; \ 2194 } 2195 JNI_ENTRY_POINT_INFO(pDlsymLookup) 2196#undef JNI_ENTRY_POINT_INFO 2197 2198#define QUICK_ENTRY_POINT_INFO(x) \ 2199 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2200 os << #x; \ 2201 return; \ 2202 } 2203 QUICK_ENTRY_POINT_INFO(pAllocArray) 2204 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 2205 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 2206 QUICK_ENTRY_POINT_INFO(pAllocObject) 2207 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 2208 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 2209 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 2210 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 2211 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 2212 QUICK_ENTRY_POINT_INFO(pAllocStringFromBytes) 2213 QUICK_ENTRY_POINT_INFO(pAllocStringFromChars) 2214 QUICK_ENTRY_POINT_INFO(pAllocStringFromString) 2215 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 2216 QUICK_ENTRY_POINT_INFO(pCheckCast) 2217 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 2218 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 2219 QUICK_ENTRY_POINT_INFO(pInitializeType) 2220 QUICK_ENTRY_POINT_INFO(pResolveString) 2221 QUICK_ENTRY_POINT_INFO(pSet8Instance) 2222 QUICK_ENTRY_POINT_INFO(pSet8Static) 2223 QUICK_ENTRY_POINT_INFO(pSet16Instance) 2224 QUICK_ENTRY_POINT_INFO(pSet16Static) 2225 QUICK_ENTRY_POINT_INFO(pSet32Instance) 2226 QUICK_ENTRY_POINT_INFO(pSet32Static) 2227 QUICK_ENTRY_POINT_INFO(pSet64Instance) 2228 QUICK_ENTRY_POINT_INFO(pSet64Static) 2229 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 2230 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 2231 QUICK_ENTRY_POINT_INFO(pGetByteInstance) 2232 QUICK_ENTRY_POINT_INFO(pGetBooleanInstance) 2233 QUICK_ENTRY_POINT_INFO(pGetByteStatic) 2234 QUICK_ENTRY_POINT_INFO(pGetBooleanStatic) 2235 QUICK_ENTRY_POINT_INFO(pGetShortInstance) 2236 QUICK_ENTRY_POINT_INFO(pGetCharInstance) 2237 QUICK_ENTRY_POINT_INFO(pGetShortStatic) 2238 QUICK_ENTRY_POINT_INFO(pGetCharStatic) 2239 QUICK_ENTRY_POINT_INFO(pGet32Instance) 2240 QUICK_ENTRY_POINT_INFO(pGet32Static) 2241 QUICK_ENTRY_POINT_INFO(pGet64Instance) 2242 QUICK_ENTRY_POINT_INFO(pGet64Static) 2243 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 2244 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 2245 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 2246 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 2247 QUICK_ENTRY_POINT_INFO(pAputObject) 2248 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 2249 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 2250 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 2251 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 2252 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 2253 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 2254 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 2255 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 2256 QUICK_ENTRY_POINT_INFO(pLockObject) 2257 QUICK_ENTRY_POINT_INFO(pUnlockObject) 2258 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 2259 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 2260 QUICK_ENTRY_POINT_INFO(pCmplDouble) 2261 QUICK_ENTRY_POINT_INFO(pCmplFloat) 2262 QUICK_ENTRY_POINT_INFO(pFmod) 2263 QUICK_ENTRY_POINT_INFO(pL2d) 2264 QUICK_ENTRY_POINT_INFO(pFmodf) 2265 QUICK_ENTRY_POINT_INFO(pL2f) 2266 QUICK_ENTRY_POINT_INFO(pD2iz) 2267 QUICK_ENTRY_POINT_INFO(pF2iz) 2268 QUICK_ENTRY_POINT_INFO(pIdivmod) 2269 QUICK_ENTRY_POINT_INFO(pD2l) 2270 QUICK_ENTRY_POINT_INFO(pF2l) 2271 QUICK_ENTRY_POINT_INFO(pLdiv) 2272 QUICK_ENTRY_POINT_INFO(pLmod) 2273 QUICK_ENTRY_POINT_INFO(pLmul) 2274 QUICK_ENTRY_POINT_INFO(pShlLong) 2275 QUICK_ENTRY_POINT_INFO(pShrLong) 2276 QUICK_ENTRY_POINT_INFO(pUshrLong) 2277 QUICK_ENTRY_POINT_INFO(pIndexOf) 2278 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 2279 QUICK_ENTRY_POINT_INFO(pMemcpy) 2280 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 2281 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 2282 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 2283 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 2284 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 2285 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 2286 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 2287 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 2288 QUICK_ENTRY_POINT_INFO(pTestSuspend) 2289 QUICK_ENTRY_POINT_INFO(pDeliverException) 2290 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 2291 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 2292 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 2293 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 2294 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 2295 QUICK_ENTRY_POINT_INFO(pDeoptimize) 2296 QUICK_ENTRY_POINT_INFO(pA64Load) 2297 QUICK_ENTRY_POINT_INFO(pA64Store) 2298 QUICK_ENTRY_POINT_INFO(pNewEmptyString) 2299 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_B) 2300 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BI) 2301 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BII) 2302 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIII) 2303 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIIString) 2304 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BString) 2305 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIICharset) 2306 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BCharset) 2307 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_C) 2308 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_CII) 2309 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_IIC) 2310 QUICK_ENTRY_POINT_INFO(pNewStringFromCodePoints) 2311 QUICK_ENTRY_POINT_INFO(pNewStringFromString) 2312 QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuffer) 2313 QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuilder) 2314 QUICK_ENTRY_POINT_INFO(pReadBarrierJni) 2315 QUICK_ENTRY_POINT_INFO(pReadBarrierSlow) 2316#undef QUICK_ENTRY_POINT_INFO 2317 2318 os << offset; 2319} 2320 2321void Thread::QuickDeliverException() { 2322 // Get exception from thread. 2323 mirror::Throwable* exception = GetException(); 2324 CHECK(exception != nullptr); 2325 // Don't leave exception visible while we try to find the handler, which may cause class 2326 // resolution. 2327 ClearException(); 2328 bool is_deoptimization = (exception == GetDeoptimizationException()); 2329 QuickExceptionHandler exception_handler(this, is_deoptimization); 2330 if (is_deoptimization) { 2331 exception_handler.DeoptimizeStack(); 2332 } else { 2333 exception_handler.FindCatch(exception); 2334 } 2335 exception_handler.UpdateInstrumentationStack(); 2336 exception_handler.DoLongJump(); 2337} 2338 2339Context* Thread::GetLongJumpContext() { 2340 Context* result = tlsPtr_.long_jump_context; 2341 if (result == nullptr) { 2342 result = Context::Create(); 2343 } else { 2344 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 2345 result->Reset(); 2346 } 2347 return result; 2348} 2349 2350// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 2351// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 2352struct CurrentMethodVisitor FINAL : public StackVisitor { 2353 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 2354 SHARED_REQUIRES(Locks::mutator_lock_) 2355 : StackVisitor(thread, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 2356 this_object_(nullptr), 2357 method_(nullptr), 2358 dex_pc_(0), 2359 abort_on_error_(abort_on_error) {} 2360 bool VisitFrame() OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) { 2361 ArtMethod* m = GetMethod(); 2362 if (m->IsRuntimeMethod()) { 2363 // Continue if this is a runtime method. 2364 return true; 2365 } 2366 if (context_ != nullptr) { 2367 this_object_ = GetThisObject(); 2368 } 2369 method_ = m; 2370 dex_pc_ = GetDexPc(abort_on_error_); 2371 return false; 2372 } 2373 mirror::Object* this_object_; 2374 ArtMethod* method_; 2375 uint32_t dex_pc_; 2376 const bool abort_on_error_; 2377}; 2378 2379ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 2380 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 2381 visitor.WalkStack(false); 2382 if (dex_pc != nullptr) { 2383 *dex_pc = visitor.dex_pc_; 2384 } 2385 return visitor.method_; 2386} 2387 2388bool Thread::HoldsLock(mirror::Object* object) const { 2389 if (object == nullptr) { 2390 return false; 2391 } 2392 return object->GetLockOwnerThreadId() == GetThreadId(); 2393} 2394 2395// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2396template <typename RootVisitor> 2397class ReferenceMapVisitor : public StackVisitor { 2398 public: 2399 ReferenceMapVisitor(Thread* thread, Context* context, RootVisitor& visitor) 2400 SHARED_REQUIRES(Locks::mutator_lock_) 2401 // We are visiting the references in compiled frames, so we do not need 2402 // to know the inlined frames. 2403 : StackVisitor(thread, context, StackVisitor::StackWalkKind::kSkipInlinedFrames), 2404 visitor_(visitor) {} 2405 2406 bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 2407 if (false) { 2408 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2409 << StringPrintf("@ PC:%04x", GetDexPc()); 2410 } 2411 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2412 if (shadow_frame != nullptr) { 2413 VisitShadowFrame(shadow_frame); 2414 } else { 2415 VisitQuickFrame(); 2416 } 2417 return true; 2418 } 2419 2420 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_REQUIRES(Locks::mutator_lock_) { 2421 ArtMethod* m = shadow_frame->GetMethod(); 2422 VisitDeclaringClass(m); 2423 DCHECK(m != nullptr); 2424 size_t num_regs = shadow_frame->NumberOfVRegs(); 2425 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2426 // handle scope for JNI or References for interpreter. 2427 for (size_t reg = 0; reg < num_regs; ++reg) { 2428 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2429 if (ref != nullptr) { 2430 mirror::Object* new_ref = ref; 2431 visitor_(&new_ref, reg, this); 2432 if (new_ref != ref) { 2433 shadow_frame->SetVRegReference(reg, new_ref); 2434 } 2435 } 2436 } 2437 } else { 2438 // Java method. 2439 // Portable path use DexGcMap and store in Method.native_gc_map_. 2440 const uint8_t* gc_map = m->GetNativeGcMap(sizeof(void*)); 2441 CHECK(gc_map != nullptr) << PrettyMethod(m); 2442 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2443 uint32_t dex_pc = shadow_frame->GetDexPC(); 2444 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2445 DCHECK(reg_bitmap != nullptr); 2446 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2447 for (size_t reg = 0; reg < num_regs; ++reg) { 2448 if (TestBitmap(reg, reg_bitmap)) { 2449 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2450 if (ref != nullptr) { 2451 mirror::Object* new_ref = ref; 2452 visitor_(&new_ref, reg, this); 2453 if (new_ref != ref) { 2454 shadow_frame->SetVRegReference(reg, new_ref); 2455 } 2456 } 2457 } 2458 } 2459 } 2460 } 2461 2462 private: 2463 // Visiting the declaring class is necessary so that we don't unload the class of a method that 2464 // is executing. We need to ensure that the code stays mapped. 2465 void VisitDeclaringClass(ArtMethod* method) SHARED_REQUIRES(Locks::mutator_lock_) { 2466 mirror::Class* klass = method->GetDeclaringClassNoBarrier(); 2467 // klass can be null for runtime methods. 2468 if (klass != nullptr) { 2469 mirror::Object* new_ref = klass; 2470 visitor_(&new_ref, -1, this); 2471 if (new_ref != klass) { 2472 method->CASDeclaringClass(klass, new_ref->AsClass()); 2473 } 2474 } 2475 } 2476 2477 void VisitQuickFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 2478 ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 2479 DCHECK(cur_quick_frame != nullptr); 2480 ArtMethod* m = *cur_quick_frame; 2481 VisitDeclaringClass(m); 2482 2483 // Process register map (which native and runtime methods don't have) 2484 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2485 if (m->IsOptimized(sizeof(void*))) { 2486 auto* vreg_base = reinterpret_cast<StackReference<mirror::Object>*>( 2487 reinterpret_cast<uintptr_t>(cur_quick_frame)); 2488 Runtime* runtime = Runtime::Current(); 2489 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2490 uintptr_t native_pc_offset = m->NativeQuickPcOffset(GetCurrentQuickFramePc(), entry_point); 2491 CodeInfo code_info = m->GetOptimizedCodeInfo(); 2492 StackMapEncoding encoding = code_info.ExtractEncoding(); 2493 StackMap map = code_info.GetStackMapForNativePcOffset(native_pc_offset, encoding); 2494 DCHECK(map.IsValid()); 2495 MemoryRegion mask = map.GetStackMask(encoding); 2496 // Visit stack entries that hold pointers. 2497 for (size_t i = 0; i < mask.size_in_bits(); ++i) { 2498 if (mask.LoadBit(i)) { 2499 auto* ref_addr = vreg_base + i; 2500 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2501 if (ref != nullptr) { 2502 mirror::Object* new_ref = ref; 2503 visitor_(&new_ref, -1, this); 2504 if (ref != new_ref) { 2505 ref_addr->Assign(new_ref); 2506 } 2507 } 2508 } 2509 } 2510 // Visit callee-save registers that hold pointers. 2511 uint32_t register_mask = map.GetRegisterMask(encoding); 2512 for (size_t i = 0; i < BitSizeOf<uint32_t>(); ++i) { 2513 if (register_mask & (1 << i)) { 2514 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(i)); 2515 if (*ref_addr != nullptr) { 2516 visitor_(ref_addr, -1, this); 2517 } 2518 } 2519 } 2520 } else { 2521 const uint8_t* native_gc_map = m->GetNativeGcMap(sizeof(void*)); 2522 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2523 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2524 // Can't be null or how would we compile its instructions? 2525 DCHECK(code_item != nullptr) << PrettyMethod(m); 2526 NativePcOffsetToReferenceMap map(native_gc_map); 2527 size_t num_regs = map.RegWidth() * 8; 2528 if (num_regs > 0) { 2529 Runtime* runtime = Runtime::Current(); 2530 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2531 uintptr_t native_pc_offset = m->NativeQuickPcOffset(GetCurrentQuickFramePc(), entry_point); 2532 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2533 DCHECK(reg_bitmap != nullptr); 2534 const void* code_pointer = ArtMethod::EntryPointToCodePointer(entry_point); 2535 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 2536 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2537 // For all dex registers in the bitmap 2538 DCHECK(cur_quick_frame != nullptr); 2539 for (size_t reg = 0; reg < num_regs; ++reg) { 2540 // Does this register hold a reference? 2541 if (TestBitmap(reg, reg_bitmap)) { 2542 uint32_t vmap_offset; 2543 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2544 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2545 kReferenceVReg); 2546 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2547 mirror::Object** ref_addr = 2548 reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2549 if (*ref_addr != nullptr) { 2550 visitor_(ref_addr, reg, this); 2551 } 2552 } else { 2553 StackReference<mirror::Object>* ref_addr = 2554 reinterpret_cast<StackReference<mirror::Object>*>(GetVRegAddrFromQuickCode( 2555 cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2556 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2557 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2558 if (ref != nullptr) { 2559 mirror::Object* new_ref = ref; 2560 visitor_(&new_ref, reg, this); 2561 if (ref != new_ref) { 2562 ref_addr->Assign(new_ref); 2563 } 2564 } 2565 } 2566 } 2567 } 2568 } 2569 } 2570 } 2571 } 2572 2573 // Visitor for when we visit a root. 2574 RootVisitor& visitor_; 2575}; 2576 2577class RootCallbackVisitor { 2578 public: 2579 RootCallbackVisitor(RootVisitor* visitor, uint32_t tid) : visitor_(visitor), tid_(tid) {} 2580 2581 void operator()(mirror::Object** obj, size_t vreg, const StackVisitor* stack_visitor) const 2582 SHARED_REQUIRES(Locks::mutator_lock_) { 2583 visitor_->VisitRoot(obj, JavaFrameRootInfo(tid_, stack_visitor, vreg)); 2584 } 2585 2586 private: 2587 RootVisitor* const visitor_; 2588 const uint32_t tid_; 2589}; 2590 2591void Thread::VisitRoots(RootVisitor* visitor) { 2592 const uint32_t thread_id = GetThreadId(); 2593 visitor->VisitRootIfNonNull(&tlsPtr_.opeer, RootInfo(kRootThreadObject, thread_id)); 2594 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2595 visitor->VisitRoot(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), 2596 RootInfo(kRootNativeStack, thread_id)); 2597 } 2598 visitor->VisitRootIfNonNull(&tlsPtr_.monitor_enter_object, RootInfo(kRootNativeStack, thread_id)); 2599 tlsPtr_.jni_env->locals.VisitRoots(visitor, RootInfo(kRootJNILocal, thread_id)); 2600 tlsPtr_.jni_env->monitors.VisitRoots(visitor, RootInfo(kRootJNIMonitor, thread_id)); 2601 HandleScopeVisitRoots(visitor, thread_id); 2602 if (tlsPtr_.debug_invoke_req != nullptr) { 2603 tlsPtr_.debug_invoke_req->VisitRoots(visitor, RootInfo(kRootDebugger, thread_id)); 2604 } 2605 if (tlsPtr_.stacked_shadow_frame_record != nullptr) { 2606 RootCallbackVisitor visitor_to_callback(visitor, thread_id); 2607 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitor_to_callback); 2608 for (StackedShadowFrameRecord* record = tlsPtr_.stacked_shadow_frame_record; 2609 record != nullptr; 2610 record = record->GetLink()) { 2611 for (ShadowFrame* shadow_frame = record->GetShadowFrame(); 2612 shadow_frame != nullptr; 2613 shadow_frame = shadow_frame->GetLink()) { 2614 mapper.VisitShadowFrame(shadow_frame); 2615 } 2616 } 2617 } 2618 if (tlsPtr_.deoptimization_return_value_stack != nullptr) { 2619 for (DeoptimizationReturnValueRecord* record = tlsPtr_.deoptimization_return_value_stack; 2620 record != nullptr; 2621 record = record->GetLink()) { 2622 if (record->IsReference()) { 2623 visitor->VisitRootIfNonNull(record->GetGCRoot(), 2624 RootInfo(kRootThreadObject, thread_id)); 2625 } 2626 } 2627 } 2628 for (auto* verifier = tlsPtr_.method_verifier; verifier != nullptr; verifier = verifier->link_) { 2629 verifier->VisitRoots(visitor, RootInfo(kRootNativeStack, thread_id)); 2630 } 2631 // Visit roots on this thread's stack 2632 Context* context = GetLongJumpContext(); 2633 RootCallbackVisitor visitor_to_callback(visitor, thread_id); 2634 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitor_to_callback); 2635 mapper.WalkStack(); 2636 ReleaseLongJumpContext(context); 2637 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2638 visitor->VisitRootIfNonNull(&frame.this_object_, RootInfo(kRootVMInternal, thread_id)); 2639 } 2640} 2641 2642class VerifyRootVisitor : public SingleRootVisitor { 2643 public: 2644 void VisitRoot(mirror::Object* root, const RootInfo& info ATTRIBUTE_UNUSED) 2645 OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) { 2646 VerifyObject(root); 2647 } 2648}; 2649 2650void Thread::VerifyStackImpl() { 2651 VerifyRootVisitor visitor; 2652 std::unique_ptr<Context> context(Context::Create()); 2653 RootCallbackVisitor visitor_to_callback(&visitor, GetThreadId()); 2654 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitor_to_callback); 2655 mapper.WalkStack(); 2656} 2657 2658// Set the stack end to that to be used during a stack overflow 2659void Thread::SetStackEndForStackOverflow() { 2660 // During stack overflow we allow use of the full stack. 2661 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2662 // However, we seem to have already extended to use the full stack. 2663 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2664 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2665 DumpStack(LOG(ERROR)); 2666 LOG(FATAL) << "Recursive stack overflow."; 2667 } 2668 2669 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2670 2671 // Remove the stack overflow protection if is it set up. 2672 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2673 if (implicit_stack_check) { 2674 if (!UnprotectStack()) { 2675 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2676 } 2677 } 2678} 2679 2680void Thread::SetTlab(uint8_t* start, uint8_t* end) { 2681 DCHECK_LE(start, end); 2682 tlsPtr_.thread_local_start = start; 2683 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2684 tlsPtr_.thread_local_end = end; 2685 tlsPtr_.thread_local_objects = 0; 2686} 2687 2688bool Thread::HasTlab() const { 2689 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2690 if (has_tlab) { 2691 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2692 } else { 2693 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2694 } 2695 return has_tlab; 2696} 2697 2698std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2699 thread.ShortDump(os); 2700 return os; 2701} 2702 2703void Thread::ProtectStack() { 2704 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2705 VLOG(threads) << "Protecting stack at " << pregion; 2706 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2707 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2708 "Reason: " 2709 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2710 } 2711} 2712 2713bool Thread::UnprotectStack() { 2714 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2715 VLOG(threads) << "Unprotecting stack at " << pregion; 2716 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2717} 2718 2719void Thread::ActivateSingleStepControl(SingleStepControl* ssc) { 2720 CHECK(Dbg::IsDebuggerActive()); 2721 CHECK(GetSingleStepControl() == nullptr) << "Single step already active in thread " << *this; 2722 CHECK(ssc != nullptr); 2723 tlsPtr_.single_step_control = ssc; 2724} 2725 2726void Thread::DeactivateSingleStepControl() { 2727 CHECK(Dbg::IsDebuggerActive()); 2728 CHECK(GetSingleStepControl() != nullptr) << "Single step not active in thread " << *this; 2729 SingleStepControl* ssc = GetSingleStepControl(); 2730 tlsPtr_.single_step_control = nullptr; 2731 delete ssc; 2732} 2733 2734void Thread::SetDebugInvokeReq(DebugInvokeReq* req) { 2735 CHECK(Dbg::IsDebuggerActive()); 2736 CHECK(GetInvokeReq() == nullptr) << "Debug invoke req already active in thread " << *this; 2737 CHECK(Thread::Current() != this) << "Debug invoke can't be dispatched by the thread itself"; 2738 CHECK(req != nullptr); 2739 tlsPtr_.debug_invoke_req = req; 2740} 2741 2742void Thread::ClearDebugInvokeReq() { 2743 CHECK(GetInvokeReq() != nullptr) << "Debug invoke req not active in thread " << *this; 2744 CHECK(Thread::Current() == this) << "Debug invoke must be finished by the thread itself"; 2745 DebugInvokeReq* req = tlsPtr_.debug_invoke_req; 2746 tlsPtr_.debug_invoke_req = nullptr; 2747 delete req; 2748} 2749 2750void Thread::PushVerifier(verifier::MethodVerifier* verifier) { 2751 verifier->link_ = tlsPtr_.method_verifier; 2752 tlsPtr_.method_verifier = verifier; 2753} 2754 2755void Thread::PopVerifier(verifier::MethodVerifier* verifier) { 2756 CHECK_EQ(tlsPtr_.method_verifier, verifier); 2757 tlsPtr_.method_verifier = verifier->link_; 2758} 2759 2760size_t Thread::NumberOfHeldMutexes() const { 2761 size_t count = 0; 2762 for (BaseMutex* mu : tlsPtr_.held_mutexes) { 2763 count += mu != nullptr ? 1 : 0; 2764 } 2765 return count; 2766} 2767 2768} // namespace art 2769