thread.cc revision f1d666e1b48f8070ef1177fce156c08827f08eb8
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 DeoptimizationContextRecord { 166 public: 167 DeoptimizationContextRecord(const JValue& ret_val, bool is_reference, 168 mirror::Throwable* pending_exception, 169 DeoptimizationContextRecord* link) 170 : ret_val_(ret_val), is_reference_(is_reference), pending_exception_(pending_exception), 171 link_(link) {} 172 173 JValue GetReturnValue() const { return ret_val_; } 174 bool IsReference() const { return is_reference_; } 175 mirror::Throwable* GetPendingException() const { return pending_exception_; } 176 DeoptimizationContextRecord* GetLink() const { return link_; } 177 mirror::Object** GetReturnValueAsGCRoot() { 178 DCHECK(is_reference_); 179 return ret_val_.GetGCRoot(); 180 } 181 mirror::Object** GetPendingExceptionAsGCRoot() { 182 return reinterpret_cast<mirror::Object**>(&pending_exception_); 183 } 184 185 private: 186 // The value returned by the method at the top of the stack before deoptimization. 187 JValue ret_val_; 188 189 // Indicates whether the returned value is a reference. If so, the GC will visit it. 190 const bool is_reference_; 191 192 // The exception that was pending before deoptimization (or null if there was no pending 193 // exception). 194 mirror::Throwable* pending_exception_; 195 196 // A link to the previous DeoptimizationContextRecord. 197 DeoptimizationContextRecord* const link_; 198 199 DISALLOW_COPY_AND_ASSIGN(DeoptimizationContextRecord); 200}; 201 202class StackedShadowFrameRecord { 203 public: 204 StackedShadowFrameRecord(ShadowFrame* shadow_frame, 205 StackedShadowFrameType type, 206 StackedShadowFrameRecord* link) 207 : shadow_frame_(shadow_frame), 208 type_(type), 209 link_(link) {} 210 211 ShadowFrame* GetShadowFrame() const { return shadow_frame_; } 212 StackedShadowFrameType GetType() const { return type_; } 213 StackedShadowFrameRecord* GetLink() const { return link_; } 214 215 private: 216 ShadowFrame* const shadow_frame_; 217 const StackedShadowFrameType type_; 218 StackedShadowFrameRecord* const link_; 219 220 DISALLOW_COPY_AND_ASSIGN(StackedShadowFrameRecord); 221}; 222 223void Thread::PushDeoptimizationContext(const JValue& return_value, bool is_reference, 224 mirror::Throwable* exception) { 225 DeoptimizationContextRecord* record = new DeoptimizationContextRecord( 226 return_value, 227 is_reference, 228 exception, 229 tlsPtr_.deoptimization_context_stack); 230 tlsPtr_.deoptimization_context_stack = record; 231} 232 233void Thread::PopDeoptimizationContext(JValue* result, mirror::Throwable** exception) { 234 AssertHasDeoptimizationContext(); 235 DeoptimizationContextRecord* record = tlsPtr_.deoptimization_context_stack; 236 tlsPtr_.deoptimization_context_stack = record->GetLink(); 237 result->SetJ(record->GetReturnValue().GetJ()); 238 *exception = record->GetPendingException(); 239 delete record; 240} 241 242void Thread::AssertHasDeoptimizationContext() { 243 CHECK(tlsPtr_.deoptimization_context_stack != nullptr) 244 << "No deoptimization context for thread " << *this; 245} 246 247void Thread::PushStackedShadowFrame(ShadowFrame* sf, StackedShadowFrameType type) { 248 StackedShadowFrameRecord* record = new StackedShadowFrameRecord( 249 sf, type, tlsPtr_.stacked_shadow_frame_record); 250 tlsPtr_.stacked_shadow_frame_record = record; 251} 252 253ShadowFrame* Thread::PopStackedShadowFrame(StackedShadowFrameType type) { 254 StackedShadowFrameRecord* record = tlsPtr_.stacked_shadow_frame_record; 255 DCHECK(record != nullptr); 256 DCHECK_EQ(record->GetType(), type); 257 tlsPtr_.stacked_shadow_frame_record = record->GetLink(); 258 ShadowFrame* shadow_frame = record->GetShadowFrame(); 259 delete record; 260 return shadow_frame; 261} 262 263void Thread::InitTid() { 264 tls32_.tid = ::art::GetTid(); 265} 266 267void Thread::InitAfterFork() { 268 // One thread (us) survived the fork, but we have a new tid so we need to 269 // update the value stashed in this Thread*. 270 InitTid(); 271} 272 273void* Thread::CreateCallback(void* arg) { 274 Thread* self = reinterpret_cast<Thread*>(arg); 275 Runtime* runtime = Runtime::Current(); 276 if (runtime == nullptr) { 277 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 278 return nullptr; 279 } 280 { 281 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 282 // after self->Init(). 283 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 284 // Check that if we got here we cannot be shutting down (as shutdown should never have started 285 // while threads are being born). 286 CHECK(!runtime->IsShuttingDownLocked()); 287 // Note: given that the JNIEnv is created in the parent thread, the only failure point here is 288 // a mess in InitStackHwm. We do not have a reasonable way to recover from that, so abort 289 // the runtime in such a case. In case this ever changes, we need to make sure here to 290 // delete the tmp_jni_env, as we own it at this point. 291 CHECK(self->Init(runtime->GetThreadList(), runtime->GetJavaVM(), self->tlsPtr_.tmp_jni_env)); 292 self->tlsPtr_.tmp_jni_env = nullptr; 293 Runtime::Current()->EndThreadBirth(); 294 } 295 { 296 ScopedObjectAccess soa(self); 297 self->InitStringEntryPoints(); 298 299 // Copy peer into self, deleting global reference when done. 300 CHECK(self->tlsPtr_.jpeer != nullptr); 301 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 302 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 303 self->tlsPtr_.jpeer = nullptr; 304 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 305 306 ArtField* priorityField = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority); 307 self->SetNativePriority(priorityField->GetInt(self->tlsPtr_.opeer)); 308 Dbg::PostThreadStart(self); 309 310 // Invoke the 'run' method of our java.lang.Thread. 311 mirror::Object* receiver = self->tlsPtr_.opeer; 312 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 313 ScopedLocalRef<jobject> ref(soa.Env(), soa.AddLocalReference<jobject>(receiver)); 314 InvokeVirtualOrInterfaceWithJValues(soa, ref.get(), mid, nullptr); 315 } 316 // Detach and delete self. 317 Runtime::Current()->GetThreadList()->Unregister(self); 318 319 return nullptr; 320} 321 322Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 323 mirror::Object* thread_peer) { 324 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 325 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 326 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 327 // to stop it from going away. 328 if (kIsDebugBuild) { 329 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 330 if (result != nullptr && !result->IsSuspended()) { 331 Locks::thread_list_lock_->AssertHeld(soa.Self()); 332 } 333 } 334 return result; 335} 336 337Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 338 jobject java_thread) { 339 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 340} 341 342static size_t FixStackSize(size_t stack_size) { 343 // A stack size of zero means "use the default". 344 if (stack_size == 0) { 345 stack_size = Runtime::Current()->GetDefaultStackSize(); 346 } 347 348 // Dalvik used the bionic pthread default stack size for native threads, 349 // so include that here to support apps that expect large native stacks. 350 stack_size += 1 * MB; 351 352 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 353 if (stack_size < PTHREAD_STACK_MIN) { 354 stack_size = PTHREAD_STACK_MIN; 355 } 356 357 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 358 // It's likely that callers are trying to ensure they have at least a certain amount of 359 // stack space, so we should add our reserved space on top of what they requested, rather 360 // than implicitly take it away from them. 361 stack_size += GetStackOverflowReservedBytes(kRuntimeISA); 362 } else { 363 // If we are going to use implicit stack checks, allocate space for the protected 364 // region at the bottom of the stack. 365 stack_size += Thread::kStackOverflowImplicitCheckSize + 366 GetStackOverflowReservedBytes(kRuntimeISA); 367 } 368 369 // Some systems require the stack size to be a multiple of the system page size, so round up. 370 stack_size = RoundUp(stack_size, kPageSize); 371 372 return stack_size; 373} 374 375// Global variable to prevent the compiler optimizing away the page reads for the stack. 376uint8_t dont_optimize_this; 377 378// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 379// overflow is detected. It is located right below the stack_begin_. 380// 381// There is a little complexity here that deserves a special mention. On some 382// architectures, the stack created using a VM_GROWSDOWN flag 383// to prevent memory being allocated when it's not needed. This flag makes the 384// kernel only allocate memory for the stack by growing down in memory. Because we 385// want to put an mprotected region far away from that at the stack top, we need 386// to make sure the pages for the stack are mapped in before we call mprotect. We do 387// this by reading every page from the stack bottom (highest address) to the stack top. 388// We then madvise this away. 389 390// AddressSanitizer does not like the part of this functions that reads every stack page. 391// Looks a lot like an out-of-bounds access. 392ATTRIBUTE_NO_SANITIZE_ADDRESS 393void Thread::InstallImplicitProtection() { 394 uint8_t* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 395 uint8_t* stack_himem = tlsPtr_.stack_end; 396 uint8_t* stack_top = reinterpret_cast<uint8_t*>(reinterpret_cast<uintptr_t>(&stack_himem) & 397 ~(kPageSize - 1)); // Page containing current top of stack. 398 399 // First remove the protection on the protected region as will want to read and 400 // write it. This may fail (on the first attempt when the stack is not mapped) 401 // but we ignore that. 402 UnprotectStack(); 403 404 // Map in the stack. This must be done by reading from the 405 // current stack pointer downwards as the stack may be mapped using VM_GROWSDOWN 406 // in the kernel. Any access more than a page below the current SP might cause 407 // a segv. 408 409 // Read every page from the high address to the low. 410 for (uint8_t* p = stack_top; p >= pregion; p -= kPageSize) { 411 dont_optimize_this = *p; 412 } 413 414 VLOG(threads) << "installing stack protected region at " << std::hex << 415 static_cast<void*>(pregion) << " to " << 416 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 417 418 // Protect the bottom of the stack to prevent read/write to it. 419 ProtectStack(); 420 421 // Tell the kernel that we won't be needing these pages any more. 422 // NB. madvise will probably write zeroes into the memory (on linux it does). 423 uint32_t unwanted_size = stack_top - pregion - kPageSize; 424 madvise(pregion, unwanted_size, MADV_DONTNEED); 425} 426 427void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 428 CHECK(java_peer != nullptr); 429 Thread* self = static_cast<JNIEnvExt*>(env)->self; 430 431 if (VLOG_IS_ON(threads)) { 432 ScopedObjectAccess soa(env); 433 434 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 435 mirror::String* java_name = reinterpret_cast<mirror::String*>(f->GetObject( 436 soa.Decode<mirror::Object*>(java_peer))); 437 std::string thread_name; 438 if (java_name != nullptr) { 439 thread_name = java_name->ToModifiedUtf8(); 440 } else { 441 thread_name = "(Unnamed)"; 442 } 443 444 VLOG(threads) << "Creating native thread for " << thread_name; 445 self->Dump(LOG(INFO)); 446 } 447 448 Runtime* runtime = Runtime::Current(); 449 450 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 451 bool thread_start_during_shutdown = false; 452 { 453 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 454 if (runtime->IsShuttingDownLocked()) { 455 thread_start_during_shutdown = true; 456 } else { 457 runtime->StartThreadBirth(); 458 } 459 } 460 if (thread_start_during_shutdown) { 461 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 462 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 463 return; 464 } 465 466 Thread* child_thread = new Thread(is_daemon); 467 // Use global JNI ref to hold peer live while child thread starts. 468 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 469 stack_size = FixStackSize(stack_size); 470 471 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 472 // assign it. 473 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 474 reinterpret_cast<jlong>(child_thread)); 475 476 // Try to allocate a JNIEnvExt for the thread. We do this here as we might be out of memory and 477 // do not have a good way to report this on the child's side. 478 std::unique_ptr<JNIEnvExt> child_jni_env_ext( 479 JNIEnvExt::Create(child_thread, Runtime::Current()->GetJavaVM())); 480 481 int pthread_create_result = 0; 482 if (child_jni_env_ext.get() != nullptr) { 483 pthread_t new_pthread; 484 pthread_attr_t attr; 485 child_thread->tlsPtr_.tmp_jni_env = child_jni_env_ext.get(); 486 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 487 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), 488 "PTHREAD_CREATE_DETACHED"); 489 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 490 pthread_create_result = pthread_create(&new_pthread, 491 &attr, 492 Thread::CreateCallback, 493 child_thread); 494 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 495 496 if (pthread_create_result == 0) { 497 // pthread_create started the new thread. The child is now responsible for managing the 498 // JNIEnvExt we created. 499 // Note: we can't check for tmp_jni_env == nullptr, as that would require synchronization 500 // between the threads. 501 child_jni_env_ext.release(); 502 return; 503 } 504 } 505 506 // Either JNIEnvExt::Create or pthread_create(3) failed, so clean up. 507 { 508 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 509 runtime->EndThreadBirth(); 510 } 511 // Manually delete the global reference since Thread::Init will not have been run. 512 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 513 child_thread->tlsPtr_.jpeer = nullptr; 514 delete child_thread; 515 child_thread = nullptr; 516 // TODO: remove from thread group? 517 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 518 { 519 std::string msg(child_jni_env_ext.get() == nullptr ? 520 "Could not allocate JNI Env" : 521 StringPrintf("pthread_create (%s stack) failed: %s", 522 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 523 ScopedObjectAccess soa(env); 524 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 525 } 526} 527 528bool Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm, JNIEnvExt* jni_env_ext) { 529 // This function does all the initialization that must be run by the native thread it applies to. 530 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 531 // we can handshake with the corresponding native thread when it's ready.) Check this native 532 // thread hasn't been through here already... 533 CHECK(Thread::Current() == nullptr); 534 535 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 536 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 537 tlsPtr_.pthread_self = pthread_self(); 538 CHECK(is_started_); 539 540 SetUpAlternateSignalStack(); 541 if (!InitStackHwm()) { 542 return false; 543 } 544 InitCpu(); 545 InitTlsEntryPoints(); 546 RemoveSuspendTrigger(); 547 InitCardTable(); 548 InitTid(); 549 550#ifdef __ANDROID__ 551 __get_tls()[TLS_SLOT_ART_THREAD_SELF] = this; 552#else 553 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 554#endif 555 DCHECK_EQ(Thread::Current(), this); 556 557 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 558 559 if (jni_env_ext != nullptr) { 560 DCHECK_EQ(jni_env_ext->vm, java_vm); 561 DCHECK_EQ(jni_env_ext->self, this); 562 tlsPtr_.jni_env = jni_env_ext; 563 } else { 564 tlsPtr_.jni_env = JNIEnvExt::Create(this, java_vm); 565 if (tlsPtr_.jni_env == nullptr) { 566 return false; 567 } 568 } 569 570 thread_list->Register(this); 571 return true; 572} 573 574Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 575 bool create_peer) { 576 Runtime* runtime = Runtime::Current(); 577 if (runtime == nullptr) { 578 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 579 return nullptr; 580 } 581 Thread* self; 582 { 583 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 584 if (runtime->IsShuttingDownLocked()) { 585 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 586 return nullptr; 587 } else { 588 Runtime::Current()->StartThreadBirth(); 589 self = new Thread(as_daemon); 590 bool init_success = self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 591 Runtime::Current()->EndThreadBirth(); 592 if (!init_success) { 593 delete self; 594 return nullptr; 595 } 596 } 597 } 598 599 self->InitStringEntryPoints(); 600 601 CHECK_NE(self->GetState(), kRunnable); 602 self->SetState(kNative); 603 604 // If we're the main thread, ClassLinker won't be created until after we're attached, 605 // so that thread needs a two-stage attach. Regular threads don't need this hack. 606 // In the compiler, all threads need this hack, because no-one's going to be getting 607 // a native peer! 608 if (create_peer) { 609 self->CreatePeer(thread_name, as_daemon, thread_group); 610 } else { 611 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 612 if (thread_name != nullptr) { 613 self->tlsPtr_.name->assign(thread_name); 614 ::art::SetThreadName(thread_name); 615 } else if (self->GetJniEnv()->check_jni) { 616 LOG(WARNING) << *Thread::Current() << " attached without supplying a name"; 617 } 618 } 619 620 if (VLOG_IS_ON(threads)) { 621 if (thread_name != nullptr) { 622 VLOG(threads) << "Attaching thread " << thread_name; 623 } else { 624 VLOG(threads) << "Attaching unnamed thread."; 625 } 626 ScopedObjectAccess soa(self); 627 self->Dump(LOG(INFO)); 628 } 629 630 { 631 ScopedObjectAccess soa(self); 632 Dbg::PostThreadStart(self); 633 } 634 635 return self; 636} 637 638void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 639 Runtime* runtime = Runtime::Current(); 640 CHECK(runtime->IsStarted()); 641 JNIEnv* env = tlsPtr_.jni_env; 642 643 if (thread_group == nullptr) { 644 thread_group = runtime->GetMainThreadGroup(); 645 } 646 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 647 // Add missing null check in case of OOM b/18297817 648 if (name != nullptr && thread_name.get() == nullptr) { 649 CHECK(IsExceptionPending()); 650 return; 651 } 652 jint thread_priority = GetNativePriority(); 653 jboolean thread_is_daemon = as_daemon; 654 655 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 656 if (peer.get() == nullptr) { 657 CHECK(IsExceptionPending()); 658 return; 659 } 660 { 661 ScopedObjectAccess soa(this); 662 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 663 } 664 env->CallNonvirtualVoidMethod(peer.get(), 665 WellKnownClasses::java_lang_Thread, 666 WellKnownClasses::java_lang_Thread_init, 667 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 668 AssertNoPendingException(); 669 670 Thread* self = this; 671 DCHECK_EQ(self, Thread::Current()); 672 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 673 reinterpret_cast<jlong>(self)); 674 675 ScopedObjectAccess soa(self); 676 StackHandleScope<1> hs(self); 677 MutableHandle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 678 if (peer_thread_name.Get() == nullptr) { 679 // The Thread constructor should have set the Thread.name to a 680 // non-null value. However, because we can run without code 681 // available (in the compiler, in tests), we manually assign the 682 // fields the constructor should have set. 683 if (runtime->IsActiveTransaction()) { 684 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 685 } else { 686 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 687 } 688 peer_thread_name.Assign(GetThreadName(soa)); 689 } 690 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 691 if (peer_thread_name.Get() != nullptr) { 692 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 693 } 694} 695 696template<bool kTransactionActive> 697void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 698 jobject thread_name, jint thread_priority) { 699 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 700 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 701 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 702 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 703 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 704 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 705 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 706 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 707} 708 709void Thread::SetThreadName(const char* name) { 710 tlsPtr_.name->assign(name); 711 ::art::SetThreadName(name); 712 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 713} 714 715bool Thread::InitStackHwm() { 716 void* read_stack_base; 717 size_t read_stack_size; 718 size_t read_guard_size; 719 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size, &read_guard_size); 720 721 tlsPtr_.stack_begin = reinterpret_cast<uint8_t*>(read_stack_base); 722 tlsPtr_.stack_size = read_stack_size; 723 724 // The minimum stack size we can cope with is the overflow reserved bytes (typically 725 // 8K) + the protected region size (4K) + another page (4K). Typically this will 726 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 727 // between 8K and 12K. 728 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 729 + 4 * KB; 730 if (read_stack_size <= min_stack) { 731 // Note, as we know the stack is small, avoid operations that could use a lot of stack. 732 LogMessage::LogLineLowStack(__PRETTY_FUNCTION__, __LINE__, ERROR, 733 "Attempt to attach a thread with a too-small stack"); 734 return false; 735 } 736 737 // This is included in the SIGQUIT output, but it's useful here for thread debugging. 738 VLOG(threads) << StringPrintf("Native stack is at %p (%s with %s guard)", 739 read_stack_base, 740 PrettySize(read_stack_size).c_str(), 741 PrettySize(read_guard_size).c_str()); 742 743 // Set stack_end_ to the bottom of the stack saving space of stack overflows 744 745 Runtime* runtime = Runtime::Current(); 746 bool implicit_stack_check = !runtime->ExplicitStackOverflowChecks() && !runtime->IsAotCompiler(); 747 ResetDefaultStackEnd(); 748 749 // Install the protected region if we are doing implicit overflow checks. 750 if (implicit_stack_check) { 751 // The thread might have protected region at the bottom. We need 752 // to install our own region so we need to move the limits 753 // of the stack to make room for it. 754 755 tlsPtr_.stack_begin += read_guard_size + kStackOverflowProtectedSize; 756 tlsPtr_.stack_end += read_guard_size + kStackOverflowProtectedSize; 757 tlsPtr_.stack_size -= read_guard_size; 758 759 InstallImplicitProtection(); 760 } 761 762 // Sanity check. 763 int stack_variable; 764 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 765 766 return true; 767} 768 769void Thread::ShortDump(std::ostream& os) const { 770 os << "Thread["; 771 if (GetThreadId() != 0) { 772 // If we're in kStarting, we won't have a thin lock id or tid yet. 773 os << GetThreadId() 774 << ",tid=" << GetTid() << ','; 775 } 776 os << GetState() 777 << ",Thread*=" << this 778 << ",peer=" << tlsPtr_.opeer 779 << ",\"" << (tlsPtr_.name != nullptr ? *tlsPtr_.name : "null") << "\"" 780 << "]"; 781} 782 783void Thread::Dump(std::ostream& os) const { 784 DumpState(os); 785 DumpStack(os); 786} 787 788mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 789 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 790 return (tlsPtr_.opeer != nullptr) ? 791 reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 792} 793 794void Thread::GetThreadName(std::string& name) const { 795 name.assign(*tlsPtr_.name); 796} 797 798uint64_t Thread::GetCpuMicroTime() const { 799#if defined(__linux__) 800 clockid_t cpu_clock_id; 801 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 802 timespec now; 803 clock_gettime(cpu_clock_id, &now); 804 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 805#else // __APPLE__ 806 UNIMPLEMENTED(WARNING); 807 return -1; 808#endif 809} 810 811// Attempt to rectify locks so that we dump thread list with required locks before exiting. 812static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 813 LOG(ERROR) << *thread << " suspend count already zero."; 814 Locks::thread_suspend_count_lock_->Unlock(self); 815 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 816 Locks::mutator_lock_->SharedTryLock(self); 817 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 818 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 819 } 820 } 821 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 822 Locks::thread_list_lock_->TryLock(self); 823 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 824 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 825 } 826 } 827 std::ostringstream ss; 828 Runtime::Current()->GetThreadList()->Dump(ss); 829 LOG(FATAL) << ss.str(); 830} 831 832bool Thread::ModifySuspendCount(Thread* self, int delta, AtomicInteger* suspend_barrier, 833 bool for_debugger) { 834 if (kIsDebugBuild) { 835 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 836 << delta << " " << tls32_.debug_suspend_count << " " << this; 837 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 838 Locks::thread_suspend_count_lock_->AssertHeld(self); 839 if (this != self && !IsSuspended()) { 840 Locks::thread_list_lock_->AssertHeld(self); 841 } 842 } 843 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 844 UnsafeLogFatalForSuspendCount(self, this); 845 return false; 846 } 847 848 uint16_t flags = kSuspendRequest; 849 if (delta > 0 && suspend_barrier != nullptr) { 850 uint32_t available_barrier = kMaxSuspendBarriers; 851 for (uint32_t i = 0; i < kMaxSuspendBarriers; ++i) { 852 if (tlsPtr_.active_suspend_barriers[i] == nullptr) { 853 available_barrier = i; 854 break; 855 } 856 } 857 if (available_barrier == kMaxSuspendBarriers) { 858 // No barrier spaces available, we can't add another. 859 return false; 860 } 861 tlsPtr_.active_suspend_barriers[available_barrier] = suspend_barrier; 862 flags |= kActiveSuspendBarrier; 863 } 864 865 tls32_.suspend_count += delta; 866 if (for_debugger) { 867 tls32_.debug_suspend_count += delta; 868 } 869 870 if (tls32_.suspend_count == 0) { 871 AtomicClearFlag(kSuspendRequest); 872 } else { 873 // Two bits might be set simultaneously. 874 tls32_.state_and_flags.as_atomic_int.FetchAndOrSequentiallyConsistent(flags); 875 TriggerSuspend(); 876 } 877 return true; 878} 879 880bool Thread::PassActiveSuspendBarriers(Thread* self) { 881 // Grab the suspend_count lock and copy the current set of 882 // barriers. Then clear the list and the flag. The ModifySuspendCount 883 // function requires the lock so we prevent a race between setting 884 // the kActiveSuspendBarrier flag and clearing it. 885 AtomicInteger* pass_barriers[kMaxSuspendBarriers]; 886 { 887 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 888 if (!ReadFlag(kActiveSuspendBarrier)) { 889 // quick exit test: the barriers have already been claimed - this is 890 // possible as there may be a race to claim and it doesn't matter 891 // who wins. 892 // All of the callers of this function (except the SuspendAllInternal) 893 // will first test the kActiveSuspendBarrier flag without lock. Here 894 // double-check whether the barrier has been passed with the 895 // suspend_count lock. 896 return false; 897 } 898 899 for (uint32_t i = 0; i < kMaxSuspendBarriers; ++i) { 900 pass_barriers[i] = tlsPtr_.active_suspend_barriers[i]; 901 tlsPtr_.active_suspend_barriers[i] = nullptr; 902 } 903 AtomicClearFlag(kActiveSuspendBarrier); 904 } 905 906 uint32_t barrier_count = 0; 907 for (uint32_t i = 0; i < kMaxSuspendBarriers; i++) { 908 AtomicInteger* pending_threads = pass_barriers[i]; 909 if (pending_threads != nullptr) { 910 bool done = false; 911 do { 912 int32_t cur_val = pending_threads->LoadRelaxed(); 913 CHECK_GT(cur_val, 0) << "Unexpected value for PassActiveSuspendBarriers(): " << cur_val; 914 // Reduce value by 1. 915 done = pending_threads->CompareExchangeWeakRelaxed(cur_val, cur_val - 1); 916#if ART_USE_FUTEXES 917 if (done && (cur_val - 1) == 0) { // Weak CAS may fail spuriously. 918 futex(pending_threads->Address(), FUTEX_WAKE, -1, nullptr, nullptr, 0); 919 } 920#endif 921 } while (!done); 922 ++barrier_count; 923 } 924 } 925 CHECK_GT(barrier_count, 0U); 926 return true; 927} 928 929void Thread::ClearSuspendBarrier(AtomicInteger* target) { 930 CHECK(ReadFlag(kActiveSuspendBarrier)); 931 bool clear_flag = true; 932 for (uint32_t i = 0; i < kMaxSuspendBarriers; ++i) { 933 AtomicInteger* ptr = tlsPtr_.active_suspend_barriers[i]; 934 if (ptr == target) { 935 tlsPtr_.active_suspend_barriers[i] = nullptr; 936 } else if (ptr != nullptr) { 937 clear_flag = false; 938 } 939 } 940 if (LIKELY(clear_flag)) { 941 AtomicClearFlag(kActiveSuspendBarrier); 942 } 943} 944 945void Thread::RunCheckpointFunction() { 946 Closure *checkpoints[kMaxCheckpoints]; 947 948 // Grab the suspend_count lock and copy the current set of 949 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 950 // function will also grab this lock so we prevent a race between setting 951 // the kCheckpointRequest flag and clearing it. 952 { 953 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 954 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 955 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 956 tlsPtr_.checkpoint_functions[i] = nullptr; 957 } 958 AtomicClearFlag(kCheckpointRequest); 959 } 960 961 // Outside the lock, run all the checkpoint functions that 962 // we collected. 963 bool found_checkpoint = false; 964 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 965 if (checkpoints[i] != nullptr) { 966 ATRACE_BEGIN("Checkpoint function"); 967 checkpoints[i]->Run(this); 968 ATRACE_END(); 969 found_checkpoint = true; 970 } 971 } 972 CHECK(found_checkpoint); 973} 974 975bool Thread::RequestCheckpoint(Closure* function) { 976 union StateAndFlags old_state_and_flags; 977 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 978 if (old_state_and_flags.as_struct.state != kRunnable) { 979 return false; // Fail, thread is suspended and so can't run a checkpoint. 980 } 981 982 uint32_t available_checkpoint = kMaxCheckpoints; 983 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 984 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 985 available_checkpoint = i; 986 break; 987 } 988 } 989 if (available_checkpoint == kMaxCheckpoints) { 990 // No checkpoint functions available, we can't run a checkpoint 991 return false; 992 } 993 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 994 995 // Checkpoint function installed now install flag bit. 996 // We must be runnable to request a checkpoint. 997 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 998 union StateAndFlags new_state_and_flags; 999 new_state_and_flags.as_int = old_state_and_flags.as_int; 1000 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 1001 bool success = tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent( 1002 old_state_and_flags.as_int, new_state_and_flags.as_int); 1003 if (UNLIKELY(!success)) { 1004 // The thread changed state before the checkpoint was installed. 1005 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 1006 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 1007 } else { 1008 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 1009 TriggerSuspend(); 1010 } 1011 return success; 1012} 1013 1014Closure* Thread::GetFlipFunction() { 1015 Atomic<Closure*>* atomic_func = reinterpret_cast<Atomic<Closure*>*>(&tlsPtr_.flip_function); 1016 Closure* func; 1017 do { 1018 func = atomic_func->LoadRelaxed(); 1019 if (func == nullptr) { 1020 return nullptr; 1021 } 1022 } while (!atomic_func->CompareExchangeWeakSequentiallyConsistent(func, nullptr)); 1023 DCHECK(func != nullptr); 1024 return func; 1025} 1026 1027void Thread::SetFlipFunction(Closure* function) { 1028 CHECK(function != nullptr); 1029 Atomic<Closure*>* atomic_func = reinterpret_cast<Atomic<Closure*>*>(&tlsPtr_.flip_function); 1030 atomic_func->StoreSequentiallyConsistent(function); 1031} 1032 1033void Thread::FullSuspendCheck() { 1034 VLOG(threads) << this << " self-suspending"; 1035 ATRACE_BEGIN("Full suspend check"); 1036 // Make thread appear suspended to other threads, release mutator_lock_. 1037 tls32_.suspended_at_suspend_check = true; 1038 // Transition to suspended and back to runnable, re-acquire share on mutator_lock_. 1039 ScopedThreadSuspension(this, kSuspended); 1040 tls32_.suspended_at_suspend_check = false; 1041 ATRACE_END(); 1042 VLOG(threads) << this << " self-reviving"; 1043} 1044 1045void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 1046 std::string group_name; 1047 int priority; 1048 bool is_daemon = false; 1049 Thread* self = Thread::Current(); 1050 1051 // If flip_function is not null, it means we have run a checkpoint 1052 // before the thread wakes up to execute the flip function and the 1053 // thread roots haven't been forwarded. So the following access to 1054 // the roots (opeer or methods in the frames) would be bad. Run it 1055 // here. TODO: clean up. 1056 if (thread != nullptr) { 1057 ScopedObjectAccessUnchecked soa(self); 1058 Thread* this_thread = const_cast<Thread*>(thread); 1059 Closure* flip_func = this_thread->GetFlipFunction(); 1060 if (flip_func != nullptr) { 1061 flip_func->Run(this_thread); 1062 } 1063 } 1064 1065 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 1066 // cause ScopedObjectAccessUnchecked to deadlock. 1067 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 1068 ScopedObjectAccessUnchecked soa(self); 1069 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 1070 ->GetInt(thread->tlsPtr_.opeer); 1071 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 1072 ->GetBoolean(thread->tlsPtr_.opeer); 1073 1074 mirror::Object* thread_group = 1075 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 1076 1077 if (thread_group != nullptr) { 1078 ArtField* group_name_field = 1079 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 1080 mirror::String* group_name_string = 1081 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 1082 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 1083 } 1084 } else { 1085 priority = GetNativePriority(); 1086 } 1087 1088 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 1089 if (scheduler_group_name.empty()) { 1090 scheduler_group_name = "default"; 1091 } 1092 1093 if (thread != nullptr) { 1094 os << '"' << *thread->tlsPtr_.name << '"'; 1095 if (is_daemon) { 1096 os << " daemon"; 1097 } 1098 os << " prio=" << priority 1099 << " tid=" << thread->GetThreadId() 1100 << " " << thread->GetState(); 1101 if (thread->IsStillStarting()) { 1102 os << " (still starting up)"; 1103 } 1104 os << "\n"; 1105 } else { 1106 os << '"' << ::art::GetThreadName(tid) << '"' 1107 << " prio=" << priority 1108 << " (not attached)\n"; 1109 } 1110 1111 if (thread != nullptr) { 1112 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 1113 os << " | group=\"" << group_name << "\"" 1114 << " sCount=" << thread->tls32_.suspend_count 1115 << " dsCount=" << thread->tls32_.debug_suspend_count 1116 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 1117 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 1118 } 1119 1120 os << " | sysTid=" << tid 1121 << " nice=" << getpriority(PRIO_PROCESS, tid) 1122 << " cgrp=" << scheduler_group_name; 1123 if (thread != nullptr) { 1124 int policy; 1125 sched_param sp; 1126 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 1127 __FUNCTION__); 1128 os << " sched=" << policy << "/" << sp.sched_priority 1129 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 1130 } 1131 os << "\n"; 1132 1133 // Grab the scheduler stats for this thread. 1134 std::string scheduler_stats; 1135 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 1136 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 1137 } else { 1138 scheduler_stats = "0 0 0"; 1139 } 1140 1141 char native_thread_state = '?'; 1142 int utime = 0; 1143 int stime = 0; 1144 int task_cpu = 0; 1145 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 1146 1147 os << " | state=" << native_thread_state 1148 << " schedstat=( " << scheduler_stats << " )" 1149 << " utm=" << utime 1150 << " stm=" << stime 1151 << " core=" << task_cpu 1152 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 1153 if (thread != nullptr) { 1154 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 1155 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 1156 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 1157 // Dump the held mutexes. 1158 os << " | held mutexes="; 1159 for (size_t i = 0; i < kLockLevelCount; ++i) { 1160 if (i != kMonitorLock) { 1161 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 1162 if (mutex != nullptr) { 1163 os << " \"" << mutex->GetName() << "\""; 1164 if (mutex->IsReaderWriterMutex()) { 1165 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 1166 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 1167 os << "(exclusive held)"; 1168 } else { 1169 os << "(shared held)"; 1170 } 1171 } 1172 } 1173 } 1174 } 1175 os << "\n"; 1176 } 1177} 1178 1179void Thread::DumpState(std::ostream& os) const { 1180 Thread::DumpState(os, this, GetTid()); 1181} 1182 1183struct StackDumpVisitor : public StackVisitor { 1184 StackDumpVisitor(std::ostream& os_in, Thread* thread_in, Context* context, bool can_allocate_in) 1185 SHARED_REQUIRES(Locks::mutator_lock_) 1186 : StackVisitor(thread_in, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1187 os(os_in), 1188 thread(thread_in), 1189 can_allocate(can_allocate_in), 1190 last_method(nullptr), 1191 last_line_number(0), 1192 repetition_count(0), 1193 frame_count(0) {} 1194 1195 virtual ~StackDumpVisitor() { 1196 if (frame_count == 0) { 1197 os << " (no managed stack frames)\n"; 1198 } 1199 } 1200 1201 bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 1202 ArtMethod* m = GetMethod(); 1203 if (m->IsRuntimeMethod()) { 1204 return true; 1205 } 1206 m = m->GetInterfaceMethodIfProxy(sizeof(void*)); 1207 const int kMaxRepetition = 3; 1208 mirror::Class* c = m->GetDeclaringClass(); 1209 mirror::DexCache* dex_cache = c->GetDexCache(); 1210 int line_number = -1; 1211 if (dex_cache != nullptr) { // be tolerant of bad input 1212 const DexFile& dex_file = *dex_cache->GetDexFile(); 1213 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 1214 } 1215 if (line_number == last_line_number && last_method == m) { 1216 ++repetition_count; 1217 } else { 1218 if (repetition_count >= kMaxRepetition) { 1219 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 1220 } 1221 repetition_count = 0; 1222 last_line_number = line_number; 1223 last_method = m; 1224 } 1225 if (repetition_count < kMaxRepetition) { 1226 os << " at " << PrettyMethod(m, false); 1227 if (m->IsNative()) { 1228 os << "(Native method)"; 1229 } else { 1230 const char* source_file(m->GetDeclaringClassSourceFile()); 1231 os << "(" << (source_file != nullptr ? source_file : "unavailable") 1232 << ":" << line_number << ")"; 1233 } 1234 os << "\n"; 1235 if (frame_count == 0) { 1236 Monitor::DescribeWait(os, thread); 1237 } 1238 if (can_allocate) { 1239 // Visit locks, but do not abort on errors. This would trigger a nested abort. 1240 Monitor::VisitLocks(this, DumpLockedObject, &os, false); 1241 } 1242 } 1243 1244 ++frame_count; 1245 return true; 1246 } 1247 1248 static void DumpLockedObject(mirror::Object* o, void* context) 1249 SHARED_REQUIRES(Locks::mutator_lock_) { 1250 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 1251 os << " - locked "; 1252 if (o == nullptr) { 1253 os << "an unknown object"; 1254 } else { 1255 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 1256 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 1257 // Getting the identity hashcode here would result in lock inflation and suspension of the 1258 // current thread, which isn't safe if this is the only runnable thread. 1259 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 1260 PrettyTypeOf(o).c_str()); 1261 } else { 1262 // IdentityHashCode can cause thread suspension, which would invalidate o if it moved. So 1263 // we get the pretty type beofre we call IdentityHashCode. 1264 const std::string pretty_type(PrettyTypeOf(o)); 1265 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), pretty_type.c_str()); 1266 } 1267 } 1268 os << "\n"; 1269 } 1270 1271 std::ostream& os; 1272 const Thread* thread; 1273 const bool can_allocate; 1274 ArtMethod* last_method; 1275 int last_line_number; 1276 int repetition_count; 1277 int frame_count; 1278}; 1279 1280static bool ShouldShowNativeStack(const Thread* thread) 1281 SHARED_REQUIRES(Locks::mutator_lock_) { 1282 ThreadState state = thread->GetState(); 1283 1284 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 1285 if (state > kWaiting && state < kStarting) { 1286 return true; 1287 } 1288 1289 // In an Object.wait variant or Thread.sleep? That's not interesting. 1290 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 1291 return false; 1292 } 1293 1294 // Threads with no managed stack frames should be shown. 1295 const ManagedStack* managed_stack = thread->GetManagedStack(); 1296 if (managed_stack == nullptr || (managed_stack->GetTopQuickFrame() == nullptr && 1297 managed_stack->GetTopShadowFrame() == nullptr)) { 1298 return true; 1299 } 1300 1301 // In some other native method? That's interesting. 1302 // We don't just check kNative because native methods will be in state kSuspended if they're 1303 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 1304 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 1305 ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 1306 return current_method != nullptr && current_method->IsNative(); 1307} 1308 1309void Thread::DumpJavaStack(std::ostream& os) const { 1310 // If flip_function is not null, it means we have run a checkpoint 1311 // before the thread wakes up to execute the flip function and the 1312 // thread roots haven't been forwarded. So the following access to 1313 // the roots (locks or methods in the frames) would be bad. Run it 1314 // here. TODO: clean up. 1315 { 1316 Thread* this_thread = const_cast<Thread*>(this); 1317 Closure* flip_func = this_thread->GetFlipFunction(); 1318 if (flip_func != nullptr) { 1319 flip_func->Run(this_thread); 1320 } 1321 } 1322 1323 // Dumping the Java stack involves the verifier for locks. The verifier operates under the 1324 // assumption that there is no exception pending on entry. Thus, stash any pending exception. 1325 // Thread::Current() instead of this in case a thread is dumping the stack of another suspended 1326 // thread. 1327 StackHandleScope<1> scope(Thread::Current()); 1328 Handle<mirror::Throwable> exc; 1329 bool have_exception = false; 1330 if (IsExceptionPending()) { 1331 exc = scope.NewHandle(GetException()); 1332 const_cast<Thread*>(this)->ClearException(); 1333 have_exception = true; 1334 } 1335 1336 std::unique_ptr<Context> context(Context::Create()); 1337 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 1338 !tls32_.throwing_OutOfMemoryError); 1339 dumper.WalkStack(); 1340 1341 if (have_exception) { 1342 const_cast<Thread*>(this)->SetException(exc.Get()); 1343 } 1344} 1345 1346void Thread::DumpStack(std::ostream& os) const { 1347 // TODO: we call this code when dying but may not have suspended the thread ourself. The 1348 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 1349 // the race with the thread_suspend_count_lock_). 1350 bool dump_for_abort = (gAborting > 0); 1351 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 1352 if (!kIsDebugBuild) { 1353 // We always want to dump the stack for an abort, however, there is no point dumping another 1354 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 1355 safe_to_dump = (safe_to_dump || dump_for_abort); 1356 } 1357 if (safe_to_dump) { 1358 // If we're currently in native code, dump that stack before dumping the managed stack. 1359 if (dump_for_abort || ShouldShowNativeStack(this)) { 1360 DumpKernelStack(os, GetTid(), " kernel: ", false); 1361 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr, !dump_for_abort)); 1362 } 1363 DumpJavaStack(os); 1364 } else { 1365 os << "Not able to dump stack of thread that isn't suspended"; 1366 } 1367} 1368 1369void Thread::ThreadExitCallback(void* arg) { 1370 Thread* self = reinterpret_cast<Thread*>(arg); 1371 if (self->tls32_.thread_exit_check_count == 0) { 1372 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1373 "going to use a pthread_key_create destructor?): " << *self; 1374 CHECK(is_started_); 1375#ifdef __ANDROID__ 1376 __get_tls()[TLS_SLOT_ART_THREAD_SELF] = self; 1377#else 1378 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1379#endif 1380 self->tls32_.thread_exit_check_count = 1; 1381 } else { 1382 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1383 } 1384} 1385 1386void Thread::Startup() { 1387 CHECK(!is_started_); 1388 is_started_ = true; 1389 { 1390 // MutexLock to keep annotalysis happy. 1391 // 1392 // Note we use null for the thread because Thread::Current can 1393 // return garbage since (is_started_ == true) and 1394 // Thread::pthread_key_self_ is not yet initialized. 1395 // This was seen on glibc. 1396 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1397 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1398 *Locks::thread_suspend_count_lock_); 1399 } 1400 1401 // Allocate a TLS slot. 1402 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), 1403 "self key"); 1404 1405 // Double-check the TLS slot allocation. 1406 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1407 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1408 } 1409} 1410 1411void Thread::FinishStartup() { 1412 Runtime* runtime = Runtime::Current(); 1413 CHECK(runtime->IsStarted()); 1414 1415 // Finish attaching the main thread. 1416 ScopedObjectAccess soa(Thread::Current()); 1417 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1418 1419 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1420} 1421 1422void Thread::Shutdown() { 1423 CHECK(is_started_); 1424 is_started_ = false; 1425 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1426 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1427 if (resume_cond_ != nullptr) { 1428 delete resume_cond_; 1429 resume_cond_ = nullptr; 1430 } 1431} 1432 1433Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1434 wait_mutex_ = new Mutex("a thread wait mutex"); 1435 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1436 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1437 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1438 tlsPtr_.nested_signal_state = static_cast<jmp_buf*>(malloc(sizeof(jmp_buf))); 1439 1440 static_assert((sizeof(Thread) % 4) == 0U, 1441 "art::Thread has a size which is not a multiple of 4."); 1442 tls32_.state_and_flags.as_struct.flags = 0; 1443 tls32_.state_and_flags.as_struct.state = kNative; 1444 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1445 std::fill(tlsPtr_.rosalloc_runs, 1446 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1447 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1448 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1449 tlsPtr_.checkpoint_functions[i] = nullptr; 1450 } 1451 for (uint32_t i = 0; i < kMaxSuspendBarriers; ++i) { 1452 tlsPtr_.active_suspend_barriers[i] = nullptr; 1453 } 1454 tlsPtr_.flip_function = nullptr; 1455 tlsPtr_.thread_local_mark_stack = nullptr; 1456 tls32_.suspended_at_suspend_check = false; 1457} 1458 1459bool Thread::IsStillStarting() const { 1460 // You might think you can check whether the state is kStarting, but for much of thread startup, 1461 // the thread is in kNative; it might also be in kVmWait. 1462 // You might think you can check whether the peer is null, but the peer is actually created and 1463 // assigned fairly early on, and needs to be. 1464 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1465 // this thread _ever_ entered kRunnable". 1466 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1467 (*tlsPtr_.name == kThreadNameDuringStartup); 1468} 1469 1470void Thread::AssertPendingException() const { 1471 CHECK(IsExceptionPending()) << "Pending exception expected."; 1472} 1473 1474void Thread::AssertPendingOOMException() const { 1475 AssertPendingException(); 1476 auto* e = GetException(); 1477 CHECK_EQ(e->GetClass(), DecodeJObject(WellKnownClasses::java_lang_OutOfMemoryError)->AsClass()) 1478 << e->Dump(); 1479} 1480 1481void Thread::AssertNoPendingException() const { 1482 if (UNLIKELY(IsExceptionPending())) { 1483 ScopedObjectAccess soa(Thread::Current()); 1484 mirror::Throwable* exception = GetException(); 1485 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1486 } 1487} 1488 1489void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1490 if (UNLIKELY(IsExceptionPending())) { 1491 ScopedObjectAccess soa(Thread::Current()); 1492 mirror::Throwable* exception = GetException(); 1493 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1494 << exception->Dump(); 1495 } 1496} 1497 1498class MonitorExitVisitor : public SingleRootVisitor { 1499 public: 1500 explicit MonitorExitVisitor(Thread* self) : self_(self) { } 1501 1502 // NO_THREAD_SAFETY_ANALYSIS due to MonitorExit. 1503 void VisitRoot(mirror::Object* entered_monitor, const RootInfo& info ATTRIBUTE_UNUSED) 1504 OVERRIDE NO_THREAD_SAFETY_ANALYSIS { 1505 if (self_->HoldsLock(entered_monitor)) { 1506 LOG(WARNING) << "Calling MonitorExit on object " 1507 << entered_monitor << " (" << PrettyTypeOf(entered_monitor) << ")" 1508 << " left locked by native thread " 1509 << *Thread::Current() << " which is detaching"; 1510 entered_monitor->MonitorExit(self_); 1511 } 1512 } 1513 1514 private: 1515 Thread* const self_; 1516}; 1517 1518void Thread::Destroy() { 1519 Thread* self = this; 1520 DCHECK_EQ(self, Thread::Current()); 1521 1522 if (tlsPtr_.jni_env != nullptr) { 1523 { 1524 ScopedObjectAccess soa(self); 1525 MonitorExitVisitor visitor(self); 1526 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1527 tlsPtr_.jni_env->monitors.VisitRoots(&visitor, RootInfo(kRootVMInternal)); 1528 } 1529 // Release locally held global references which releasing may require the mutator lock. 1530 if (tlsPtr_.jpeer != nullptr) { 1531 // If pthread_create fails we don't have a jni env here. 1532 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1533 tlsPtr_.jpeer = nullptr; 1534 } 1535 if (tlsPtr_.class_loader_override != nullptr) { 1536 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.class_loader_override); 1537 tlsPtr_.class_loader_override = nullptr; 1538 } 1539 } 1540 1541 if (tlsPtr_.opeer != nullptr) { 1542 ScopedObjectAccess soa(self); 1543 // We may need to call user-supplied managed code, do this before final clean-up. 1544 HandleUncaughtExceptions(soa); 1545 RemoveFromThreadGroup(soa); 1546 1547 // this.nativePeer = 0; 1548 if (Runtime::Current()->IsActiveTransaction()) { 1549 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1550 ->SetLong<true>(tlsPtr_.opeer, 0); 1551 } else { 1552 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1553 ->SetLong<false>(tlsPtr_.opeer, 0); 1554 } 1555 Dbg::PostThreadDeath(self); 1556 1557 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1558 // who is waiting. 1559 mirror::Object* lock = 1560 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1561 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1562 if (lock != nullptr) { 1563 StackHandleScope<1> hs(self); 1564 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1565 ObjectLock<mirror::Object> locker(self, h_obj); 1566 locker.NotifyAll(); 1567 } 1568 tlsPtr_.opeer = nullptr; 1569 } 1570 1571 { 1572 ScopedObjectAccess soa(self); 1573 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1574 if (kUseReadBarrier) { 1575 Runtime::Current()->GetHeap()->ConcurrentCopyingCollector()->RevokeThreadLocalMarkStack(this); 1576 } 1577 } 1578} 1579 1580Thread::~Thread() { 1581 CHECK(tlsPtr_.class_loader_override == nullptr); 1582 CHECK(tlsPtr_.jpeer == nullptr); 1583 CHECK(tlsPtr_.opeer == nullptr); 1584 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1585 if (initialized) { 1586 delete tlsPtr_.jni_env; 1587 tlsPtr_.jni_env = nullptr; 1588 } 1589 CHECK_NE(GetState(), kRunnable); 1590 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1591 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1592 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1593 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1594 CHECK(tlsPtr_.flip_function == nullptr); 1595 CHECK_EQ(tls32_.suspended_at_suspend_check, false); 1596 1597 // Make sure we processed all deoptimization requests. 1598 CHECK(tlsPtr_.deoptimization_context_stack == nullptr) << "Missed deoptimization"; 1599 1600 // We may be deleting a still born thread. 1601 SetStateUnsafe(kTerminated); 1602 1603 delete wait_cond_; 1604 delete wait_mutex_; 1605 1606 if (tlsPtr_.long_jump_context != nullptr) { 1607 delete tlsPtr_.long_jump_context; 1608 } 1609 1610 if (initialized) { 1611 CleanupCpu(); 1612 } 1613 1614 if (tlsPtr_.single_step_control != nullptr) { 1615 delete tlsPtr_.single_step_control; 1616 } 1617 delete tlsPtr_.instrumentation_stack; 1618 delete tlsPtr_.name; 1619 delete tlsPtr_.stack_trace_sample; 1620 free(tlsPtr_.nested_signal_state); 1621 1622 Runtime::Current()->GetHeap()->AssertThreadLocalBuffersAreRevoked(this); 1623 1624 TearDownAlternateSignalStack(); 1625} 1626 1627void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1628 if (!IsExceptionPending()) { 1629 return; 1630 } 1631 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1632 ScopedThreadStateChange tsc(this, kNative); 1633 1634 // Get and clear the exception. 1635 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1636 tlsPtr_.jni_env->ExceptionClear(); 1637 1638 // If the thread has its own handler, use that. 1639 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1640 tlsPtr_.jni_env->GetObjectField(peer.get(), 1641 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1642 if (handler.get() == nullptr) { 1643 // Otherwise use the thread group's default handler. 1644 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1645 WellKnownClasses::java_lang_Thread_group)); 1646 } 1647 1648 // Call the handler. 1649 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1650 WellKnownClasses::java_lang_Thread__UncaughtExceptionHandler_uncaughtException, 1651 peer.get(), exception.get()); 1652 1653 // If the handler threw, clear that exception too. 1654 tlsPtr_.jni_env->ExceptionClear(); 1655} 1656 1657void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1658 // this.group.removeThread(this); 1659 // group can be null if we're in the compiler or a test. 1660 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1661 ->GetObject(tlsPtr_.opeer); 1662 if (ogroup != nullptr) { 1663 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1664 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1665 ScopedThreadStateChange tsc(soa.Self(), kNative); 1666 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1667 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1668 peer.get()); 1669 } 1670} 1671 1672size_t Thread::NumHandleReferences() { 1673 size_t count = 0; 1674 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur != nullptr; cur = cur->GetLink()) { 1675 count += cur->NumberOfReferences(); 1676 } 1677 return count; 1678} 1679 1680bool Thread::HandleScopeContains(jobject obj) const { 1681 StackReference<mirror::Object>* hs_entry = 1682 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1683 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur!= nullptr; cur = cur->GetLink()) { 1684 if (cur->Contains(hs_entry)) { 1685 return true; 1686 } 1687 } 1688 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1689 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1690} 1691 1692void Thread::HandleScopeVisitRoots(RootVisitor* visitor, uint32_t thread_id) { 1693 BufferedRootVisitor<kDefaultBufferedRootCount> buffered_visitor( 1694 visitor, RootInfo(kRootNativeStack, thread_id)); 1695 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1696 for (size_t j = 0, count = cur->NumberOfReferences(); j < count; ++j) { 1697 // GetReference returns a pointer to the stack reference within the handle scope. If this 1698 // needs to be updated, it will be done by the root visitor. 1699 buffered_visitor.VisitRootIfNonNull(cur->GetHandle(j).GetReference()); 1700 } 1701 } 1702} 1703 1704mirror::Object* Thread::DecodeJObject(jobject obj) const { 1705 if (obj == nullptr) { 1706 return nullptr; 1707 } 1708 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1709 IndirectRefKind kind = GetIndirectRefKind(ref); 1710 mirror::Object* result; 1711 bool expect_null = false; 1712 // The "kinds" below are sorted by the frequency we expect to encounter them. 1713 if (kind == kLocal) { 1714 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1715 // Local references do not need a read barrier. 1716 result = locals.Get<kWithoutReadBarrier>(ref); 1717 } else if (kind == kHandleScopeOrInvalid) { 1718 // TODO: make stack indirect reference table lookup more efficient. 1719 // Check if this is a local reference in the handle scope. 1720 if (LIKELY(HandleScopeContains(obj))) { 1721 // Read from handle scope. 1722 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1723 VerifyObject(result); 1724 } else { 1725 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of invalid jobject %p", obj); 1726 expect_null = true; 1727 result = nullptr; 1728 } 1729 } else if (kind == kGlobal) { 1730 result = tlsPtr_.jni_env->vm->DecodeGlobal(ref); 1731 } else { 1732 DCHECK_EQ(kind, kWeakGlobal); 1733 result = tlsPtr_.jni_env->vm->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1734 if (Runtime::Current()->IsClearedJniWeakGlobal(result)) { 1735 // This is a special case where it's okay to return null. 1736 expect_null = true; 1737 result = nullptr; 1738 } 1739 } 1740 1741 if (UNLIKELY(!expect_null && result == nullptr)) { 1742 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of deleted %s %p", 1743 ToStr<IndirectRefKind>(kind).c_str(), obj); 1744 } 1745 return result; 1746} 1747 1748// Implements java.lang.Thread.interrupted. 1749bool Thread::Interrupted() { 1750 MutexLock mu(Thread::Current(), *wait_mutex_); 1751 bool interrupted = IsInterruptedLocked(); 1752 SetInterruptedLocked(false); 1753 return interrupted; 1754} 1755 1756// Implements java.lang.Thread.isInterrupted. 1757bool Thread::IsInterrupted() { 1758 MutexLock mu(Thread::Current(), *wait_mutex_); 1759 return IsInterruptedLocked(); 1760} 1761 1762void Thread::Interrupt(Thread* self) { 1763 MutexLock mu(self, *wait_mutex_); 1764 if (interrupted_) { 1765 return; 1766 } 1767 interrupted_ = true; 1768 NotifyLocked(self); 1769} 1770 1771void Thread::Notify() { 1772 Thread* self = Thread::Current(); 1773 MutexLock mu(self, *wait_mutex_); 1774 NotifyLocked(self); 1775} 1776 1777void Thread::NotifyLocked(Thread* self) { 1778 if (wait_monitor_ != nullptr) { 1779 wait_cond_->Signal(self); 1780 } 1781} 1782 1783void Thread::SetClassLoaderOverride(jobject class_loader_override) { 1784 if (tlsPtr_.class_loader_override != nullptr) { 1785 GetJniEnv()->DeleteGlobalRef(tlsPtr_.class_loader_override); 1786 } 1787 tlsPtr_.class_loader_override = GetJniEnv()->NewGlobalRef(class_loader_override); 1788} 1789 1790class CountStackDepthVisitor : public StackVisitor { 1791 public: 1792 explicit CountStackDepthVisitor(Thread* thread) 1793 SHARED_REQUIRES(Locks::mutator_lock_) 1794 : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1795 depth_(0), skip_depth_(0), skipping_(true) {} 1796 1797 bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 1798 // We want to skip frames up to and including the exception's constructor. 1799 // Note we also skip the frame if it doesn't have a method (namely the callee 1800 // save frame) 1801 ArtMethod* m = GetMethod(); 1802 if (skipping_ && !m->IsRuntimeMethod() && 1803 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1804 skipping_ = false; 1805 } 1806 if (!skipping_) { 1807 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1808 ++depth_; 1809 } 1810 } else { 1811 ++skip_depth_; 1812 } 1813 return true; 1814 } 1815 1816 int GetDepth() const { 1817 return depth_; 1818 } 1819 1820 int GetSkipDepth() const { 1821 return skip_depth_; 1822 } 1823 1824 private: 1825 uint32_t depth_; 1826 uint32_t skip_depth_; 1827 bool skipping_; 1828}; 1829 1830template<bool kTransactionActive> 1831class BuildInternalStackTraceVisitor : public StackVisitor { 1832 public: 1833 BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1834 : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 1835 self_(self), 1836 skip_depth_(skip_depth), 1837 count_(0), 1838 trace_(nullptr), 1839 pointer_size_(Runtime::Current()->GetClassLinker()->GetImagePointerSize()) {} 1840 1841 bool Init(int depth) SHARED_REQUIRES(Locks::mutator_lock_) ACQUIRE(Roles::uninterruptible_) { 1842 // Allocate method trace with format [method pointers][pcs]. 1843 auto* cl = Runtime::Current()->GetClassLinker(); 1844 trace_ = cl->AllocPointerArray(self_, depth * 2); 1845 const char* last_no_suspend_cause = 1846 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1847 if (trace_ == nullptr) { 1848 self_->AssertPendingOOMException(); 1849 return false; 1850 } 1851 // If We are called from native, use non-transactional mode. 1852 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1853 return true; 1854 } 1855 1856 virtual ~BuildInternalStackTraceVisitor() RELEASE(Roles::uninterruptible_) { 1857 self_->EndAssertNoThreadSuspension(nullptr); 1858 } 1859 1860 bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 1861 if (trace_ == nullptr) { 1862 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1863 } 1864 if (skip_depth_ > 0) { 1865 skip_depth_--; 1866 return true; 1867 } 1868 ArtMethod* m = GetMethod(); 1869 if (m->IsRuntimeMethod()) { 1870 return true; // Ignore runtime frames (in particular callee save). 1871 } 1872 trace_->SetElementPtrSize<kTransactionActive>( 1873 count_, m, pointer_size_); 1874 trace_->SetElementPtrSize<kTransactionActive>( 1875 trace_->GetLength() / 2 + count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc(), 1876 pointer_size_); 1877 ++count_; 1878 return true; 1879 } 1880 1881 mirror::PointerArray* GetInternalStackTrace() const { 1882 return trace_; 1883 } 1884 1885 private: 1886 Thread* const self_; 1887 // How many more frames to skip. 1888 int32_t skip_depth_; 1889 // Current position down stack trace. 1890 uint32_t count_; 1891 // An array of the methods on the stack, the last entries are the dex PCs. 1892 mirror::PointerArray* trace_; 1893 // For cross compilation. 1894 size_t pointer_size_; 1895}; 1896 1897template<bool kTransactionActive> 1898jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1899 // Compute depth of stack 1900 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1901 count_visitor.WalkStack(); 1902 int32_t depth = count_visitor.GetDepth(); 1903 int32_t skip_depth = count_visitor.GetSkipDepth(); 1904 1905 // Build internal stack trace. 1906 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1907 const_cast<Thread*>(this), 1908 skip_depth); 1909 if (!build_trace_visitor.Init(depth)) { 1910 return nullptr; // Allocation failed. 1911 } 1912 build_trace_visitor.WalkStack(); 1913 mirror::PointerArray* trace = build_trace_visitor.GetInternalStackTrace(); 1914 if (kIsDebugBuild) { 1915 // Second half is dex PCs. 1916 for (uint32_t i = 0; i < static_cast<uint32_t>(trace->GetLength() / 2); ++i) { 1917 auto* method = trace->GetElementPtrSize<ArtMethod*>( 1918 i, Runtime::Current()->GetClassLinker()->GetImagePointerSize()); 1919 CHECK(method != nullptr); 1920 } 1921 } 1922 return soa.AddLocalReference<jobject>(trace); 1923} 1924template jobject Thread::CreateInternalStackTrace<false>( 1925 const ScopedObjectAccessAlreadyRunnable& soa) const; 1926template jobject Thread::CreateInternalStackTrace<true>( 1927 const ScopedObjectAccessAlreadyRunnable& soa) const; 1928 1929bool Thread::IsExceptionThrownByCurrentMethod(mirror::Throwable* exception) const { 1930 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1931 count_visitor.WalkStack(); 1932 return count_visitor.GetDepth() == exception->GetStackDepth(); 1933} 1934 1935jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1936 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1937 int* stack_depth) { 1938 // Decode the internal stack trace into the depth, method trace and PC trace 1939 int32_t depth = soa.Decode<mirror::PointerArray*>(internal)->GetLength() / 2; 1940 1941 auto* cl = Runtime::Current()->GetClassLinker(); 1942 1943 jobjectArray result; 1944 1945 if (output_array != nullptr) { 1946 // Reuse the array we were given. 1947 result = output_array; 1948 // ...adjusting the number of frames we'll write to not exceed the array length. 1949 const int32_t traces_length = 1950 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1951 depth = std::min(depth, traces_length); 1952 } else { 1953 // Create java_trace array and place in local reference table 1954 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1955 cl->AllocStackTraceElementArray(soa.Self(), depth); 1956 if (java_traces == nullptr) { 1957 return nullptr; 1958 } 1959 result = soa.AddLocalReference<jobjectArray>(java_traces); 1960 } 1961 1962 if (stack_depth != nullptr) { 1963 *stack_depth = depth; 1964 } 1965 1966 for (int32_t i = 0; i < depth; ++i) { 1967 auto* method_trace = soa.Decode<mirror::PointerArray*>(internal); 1968 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1969 ArtMethod* method = method_trace->GetElementPtrSize<ArtMethod*>(i, sizeof(void*)); 1970 uint32_t dex_pc = method_trace->GetElementPtrSize<uint32_t>( 1971 i + method_trace->GetLength() / 2, sizeof(void*)); 1972 int32_t line_number; 1973 StackHandleScope<3> hs(soa.Self()); 1974 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1975 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1976 if (method->IsProxyMethod()) { 1977 line_number = -1; 1978 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1979 // source_name_object intentionally left null for proxy methods 1980 } else { 1981 line_number = method->GetLineNumFromDexPC(dex_pc); 1982 // Allocate element, potentially triggering GC 1983 // TODO: reuse class_name_object via Class::name_? 1984 const char* descriptor = method->GetDeclaringClassDescriptor(); 1985 CHECK(descriptor != nullptr); 1986 std::string class_name(PrettyDescriptor(descriptor)); 1987 class_name_object.Assign( 1988 mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1989 if (class_name_object.Get() == nullptr) { 1990 soa.Self()->AssertPendingOOMException(); 1991 return nullptr; 1992 } 1993 const char* source_file = method->GetDeclaringClassSourceFile(); 1994 if (source_file != nullptr) { 1995 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1996 if (source_name_object.Get() == nullptr) { 1997 soa.Self()->AssertPendingOOMException(); 1998 return nullptr; 1999 } 2000 } 2001 } 2002 const char* method_name = method->GetInterfaceMethodIfProxy(sizeof(void*))->GetName(); 2003 CHECK(method_name != nullptr); 2004 Handle<mirror::String> method_name_object( 2005 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 2006 if (method_name_object.Get() == nullptr) { 2007 return nullptr; 2008 } 2009 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 2010 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 2011 if (obj == nullptr) { 2012 return nullptr; 2013 } 2014 // We are called from native: use non-transactional mode. 2015 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 2016 } 2017 return result; 2018} 2019 2020void Thread::ThrowNewExceptionF(const char* exception_class_descriptor, const char* fmt, ...) { 2021 va_list args; 2022 va_start(args, fmt); 2023 ThrowNewExceptionV(exception_class_descriptor, fmt, args); 2024 va_end(args); 2025} 2026 2027void Thread::ThrowNewExceptionV(const char* exception_class_descriptor, 2028 const char* fmt, va_list ap) { 2029 std::string msg; 2030 StringAppendV(&msg, fmt, ap); 2031 ThrowNewException(exception_class_descriptor, msg.c_str()); 2032} 2033 2034void Thread::ThrowNewException(const char* exception_class_descriptor, 2035 const char* msg) { 2036 // Callers should either clear or call ThrowNewWrappedException. 2037 AssertNoPendingExceptionForNewException(msg); 2038 ThrowNewWrappedException(exception_class_descriptor, msg); 2039} 2040 2041static mirror::ClassLoader* GetCurrentClassLoader(Thread* self) 2042 SHARED_REQUIRES(Locks::mutator_lock_) { 2043 ArtMethod* method = self->GetCurrentMethod(nullptr); 2044 return method != nullptr 2045 ? method->GetDeclaringClass()->GetClassLoader() 2046 : nullptr; 2047} 2048 2049void Thread::ThrowNewWrappedException(const char* exception_class_descriptor, 2050 const char* msg) { 2051 DCHECK_EQ(this, Thread::Current()); 2052 ScopedObjectAccessUnchecked soa(this); 2053 StackHandleScope<3> hs(soa.Self()); 2054 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(GetCurrentClassLoader(soa.Self()))); 2055 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException())); 2056 ClearException(); 2057 Runtime* runtime = Runtime::Current(); 2058 auto* cl = runtime->GetClassLinker(); 2059 Handle<mirror::Class> exception_class( 2060 hs.NewHandle(cl->FindClass(this, exception_class_descriptor, class_loader))); 2061 if (UNLIKELY(exception_class.Get() == nullptr)) { 2062 CHECK(IsExceptionPending()); 2063 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 2064 return; 2065 } 2066 2067 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(soa.Self(), exception_class, true, 2068 true))) { 2069 DCHECK(IsExceptionPending()); 2070 return; 2071 } 2072 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 2073 Handle<mirror::Throwable> exception( 2074 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 2075 2076 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 2077 if (exception.Get() == nullptr) { 2078 SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 2079 return; 2080 } 2081 2082 // Choose an appropriate constructor and set up the arguments. 2083 const char* signature; 2084 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 2085 if (msg != nullptr) { 2086 // Ensure we remember this and the method over the String allocation. 2087 msg_string.reset( 2088 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 2089 if (UNLIKELY(msg_string.get() == nullptr)) { 2090 CHECK(IsExceptionPending()); // OOME. 2091 return; 2092 } 2093 if (cause.get() == nullptr) { 2094 signature = "(Ljava/lang/String;)V"; 2095 } else { 2096 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 2097 } 2098 } else { 2099 if (cause.get() == nullptr) { 2100 signature = "()V"; 2101 } else { 2102 signature = "(Ljava/lang/Throwable;)V"; 2103 } 2104 } 2105 ArtMethod* exception_init_method = 2106 exception_class->FindDeclaredDirectMethod("<init>", signature, cl->GetImagePointerSize()); 2107 2108 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 2109 << PrettyDescriptor(exception_class_descriptor); 2110 2111 if (UNLIKELY(!runtime->IsStarted())) { 2112 // Something is trying to throw an exception without a started runtime, which is the common 2113 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 2114 // the exception fields directly. 2115 if (msg != nullptr) { 2116 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 2117 } 2118 if (cause.get() != nullptr) { 2119 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 2120 } 2121 ScopedLocalRef<jobject> trace(GetJniEnv(), 2122 Runtime::Current()->IsActiveTransaction() 2123 ? CreateInternalStackTrace<true>(soa) 2124 : CreateInternalStackTrace<false>(soa)); 2125 if (trace.get() != nullptr) { 2126 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 2127 } 2128 SetException(exception.Get()); 2129 } else { 2130 jvalue jv_args[2]; 2131 size_t i = 0; 2132 2133 if (msg != nullptr) { 2134 jv_args[i].l = msg_string.get(); 2135 ++i; 2136 } 2137 if (cause.get() != nullptr) { 2138 jv_args[i].l = cause.get(); 2139 ++i; 2140 } 2141 ScopedLocalRef<jobject> ref(soa.Env(), soa.AddLocalReference<jobject>(exception.Get())); 2142 InvokeWithJValues(soa, ref.get(), soa.EncodeMethod(exception_init_method), jv_args); 2143 if (LIKELY(!IsExceptionPending())) { 2144 SetException(exception.Get()); 2145 } 2146 } 2147} 2148 2149void Thread::ThrowOutOfMemoryError(const char* msg) { 2150 LOG(WARNING) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 2151 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 2152 if (!tls32_.throwing_OutOfMemoryError) { 2153 tls32_.throwing_OutOfMemoryError = true; 2154 ThrowNewException("Ljava/lang/OutOfMemoryError;", msg); 2155 tls32_.throwing_OutOfMemoryError = false; 2156 } else { 2157 Dump(LOG(WARNING)); // The pre-allocated OOME has no stack, so help out and log one. 2158 SetException(Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 2159 } 2160} 2161 2162Thread* Thread::CurrentFromGdb() { 2163 return Thread::Current(); 2164} 2165 2166void Thread::DumpFromGdb() const { 2167 std::ostringstream ss; 2168 Dump(ss); 2169 std::string str(ss.str()); 2170 // log to stderr for debugging command line processes 2171 std::cerr << str; 2172#ifdef __ANDROID__ 2173 // log to logcat for debugging frameworks processes 2174 LOG(INFO) << str; 2175#endif 2176} 2177 2178// Explicitly instantiate 32 and 64bit thread offset dumping support. 2179template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 2180template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 2181 2182template<size_t ptr_size> 2183void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 2184#define DO_THREAD_OFFSET(x, y) \ 2185 if (offset == x.Uint32Value()) { \ 2186 os << y; \ 2187 return; \ 2188 } 2189 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 2190 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 2191 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 2192 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 2193 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 2194 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 2195 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 2196 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 2197 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 2198 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 2199 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 2200 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 2201#undef DO_THREAD_OFFSET 2202 2203#define INTERPRETER_ENTRY_POINT_INFO(x) \ 2204 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2205 os << #x; \ 2206 return; \ 2207 } 2208 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 2209 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 2210#undef INTERPRETER_ENTRY_POINT_INFO 2211 2212#define JNI_ENTRY_POINT_INFO(x) \ 2213 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2214 os << #x; \ 2215 return; \ 2216 } 2217 JNI_ENTRY_POINT_INFO(pDlsymLookup) 2218#undef JNI_ENTRY_POINT_INFO 2219 2220#define QUICK_ENTRY_POINT_INFO(x) \ 2221 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 2222 os << #x; \ 2223 return; \ 2224 } 2225 QUICK_ENTRY_POINT_INFO(pAllocArray) 2226 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 2227 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 2228 QUICK_ENTRY_POINT_INFO(pAllocObject) 2229 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 2230 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 2231 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 2232 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 2233 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 2234 QUICK_ENTRY_POINT_INFO(pAllocStringFromBytes) 2235 QUICK_ENTRY_POINT_INFO(pAllocStringFromChars) 2236 QUICK_ENTRY_POINT_INFO(pAllocStringFromString) 2237 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 2238 QUICK_ENTRY_POINT_INFO(pCheckCast) 2239 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 2240 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 2241 QUICK_ENTRY_POINT_INFO(pInitializeType) 2242 QUICK_ENTRY_POINT_INFO(pResolveString) 2243 QUICK_ENTRY_POINT_INFO(pSet8Instance) 2244 QUICK_ENTRY_POINT_INFO(pSet8Static) 2245 QUICK_ENTRY_POINT_INFO(pSet16Instance) 2246 QUICK_ENTRY_POINT_INFO(pSet16Static) 2247 QUICK_ENTRY_POINT_INFO(pSet32Instance) 2248 QUICK_ENTRY_POINT_INFO(pSet32Static) 2249 QUICK_ENTRY_POINT_INFO(pSet64Instance) 2250 QUICK_ENTRY_POINT_INFO(pSet64Static) 2251 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 2252 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 2253 QUICK_ENTRY_POINT_INFO(pGetByteInstance) 2254 QUICK_ENTRY_POINT_INFO(pGetBooleanInstance) 2255 QUICK_ENTRY_POINT_INFO(pGetByteStatic) 2256 QUICK_ENTRY_POINT_INFO(pGetBooleanStatic) 2257 QUICK_ENTRY_POINT_INFO(pGetShortInstance) 2258 QUICK_ENTRY_POINT_INFO(pGetCharInstance) 2259 QUICK_ENTRY_POINT_INFO(pGetShortStatic) 2260 QUICK_ENTRY_POINT_INFO(pGetCharStatic) 2261 QUICK_ENTRY_POINT_INFO(pGet32Instance) 2262 QUICK_ENTRY_POINT_INFO(pGet32Static) 2263 QUICK_ENTRY_POINT_INFO(pGet64Instance) 2264 QUICK_ENTRY_POINT_INFO(pGet64Static) 2265 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 2266 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 2267 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 2268 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 2269 QUICK_ENTRY_POINT_INFO(pAputObject) 2270 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 2271 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 2272 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 2273 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 2274 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 2275 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 2276 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 2277 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 2278 QUICK_ENTRY_POINT_INFO(pLockObject) 2279 QUICK_ENTRY_POINT_INFO(pUnlockObject) 2280 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 2281 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 2282 QUICK_ENTRY_POINT_INFO(pCmplDouble) 2283 QUICK_ENTRY_POINT_INFO(pCmplFloat) 2284 QUICK_ENTRY_POINT_INFO(pFmod) 2285 QUICK_ENTRY_POINT_INFO(pL2d) 2286 QUICK_ENTRY_POINT_INFO(pFmodf) 2287 QUICK_ENTRY_POINT_INFO(pL2f) 2288 QUICK_ENTRY_POINT_INFO(pD2iz) 2289 QUICK_ENTRY_POINT_INFO(pF2iz) 2290 QUICK_ENTRY_POINT_INFO(pIdivmod) 2291 QUICK_ENTRY_POINT_INFO(pD2l) 2292 QUICK_ENTRY_POINT_INFO(pF2l) 2293 QUICK_ENTRY_POINT_INFO(pLdiv) 2294 QUICK_ENTRY_POINT_INFO(pLmod) 2295 QUICK_ENTRY_POINT_INFO(pLmul) 2296 QUICK_ENTRY_POINT_INFO(pShlLong) 2297 QUICK_ENTRY_POINT_INFO(pShrLong) 2298 QUICK_ENTRY_POINT_INFO(pUshrLong) 2299 QUICK_ENTRY_POINT_INFO(pIndexOf) 2300 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 2301 QUICK_ENTRY_POINT_INFO(pMemcpy) 2302 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 2303 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 2304 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 2305 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 2306 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 2307 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 2308 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 2309 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 2310 QUICK_ENTRY_POINT_INFO(pTestSuspend) 2311 QUICK_ENTRY_POINT_INFO(pDeliverException) 2312 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 2313 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 2314 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 2315 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 2316 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 2317 QUICK_ENTRY_POINT_INFO(pDeoptimize) 2318 QUICK_ENTRY_POINT_INFO(pA64Load) 2319 QUICK_ENTRY_POINT_INFO(pA64Store) 2320 QUICK_ENTRY_POINT_INFO(pNewEmptyString) 2321 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_B) 2322 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BI) 2323 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BII) 2324 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIII) 2325 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIIString) 2326 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BString) 2327 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BIICharset) 2328 QUICK_ENTRY_POINT_INFO(pNewStringFromBytes_BCharset) 2329 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_C) 2330 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_CII) 2331 QUICK_ENTRY_POINT_INFO(pNewStringFromChars_IIC) 2332 QUICK_ENTRY_POINT_INFO(pNewStringFromCodePoints) 2333 QUICK_ENTRY_POINT_INFO(pNewStringFromString) 2334 QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuffer) 2335 QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuilder) 2336 QUICK_ENTRY_POINT_INFO(pReadBarrierJni) 2337 QUICK_ENTRY_POINT_INFO(pReadBarrierSlow) 2338#undef QUICK_ENTRY_POINT_INFO 2339 2340 os << offset; 2341} 2342 2343void Thread::QuickDeliverException() { 2344 // Get exception from thread. 2345 mirror::Throwable* exception = GetException(); 2346 CHECK(exception != nullptr); 2347 // Don't leave exception visible while we try to find the handler, which may cause class 2348 // resolution. 2349 ClearException(); 2350 bool is_deoptimization = (exception == GetDeoptimizationException()); 2351 QuickExceptionHandler exception_handler(this, is_deoptimization); 2352 if (is_deoptimization) { 2353 exception_handler.DeoptimizeStack(); 2354 } else { 2355 exception_handler.FindCatch(exception); 2356 } 2357 exception_handler.UpdateInstrumentationStack(); 2358 exception_handler.DoLongJump(); 2359} 2360 2361Context* Thread::GetLongJumpContext() { 2362 Context* result = tlsPtr_.long_jump_context; 2363 if (result == nullptr) { 2364 result = Context::Create(); 2365 } else { 2366 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 2367 result->Reset(); 2368 } 2369 return result; 2370} 2371 2372// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 2373// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 2374struct CurrentMethodVisitor FINAL : public StackVisitor { 2375 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 2376 SHARED_REQUIRES(Locks::mutator_lock_) 2377 : StackVisitor(thread, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames), 2378 this_object_(nullptr), 2379 method_(nullptr), 2380 dex_pc_(0), 2381 abort_on_error_(abort_on_error) {} 2382 bool VisitFrame() OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) { 2383 ArtMethod* m = GetMethod(); 2384 if (m->IsRuntimeMethod()) { 2385 // Continue if this is a runtime method. 2386 return true; 2387 } 2388 if (context_ != nullptr) { 2389 this_object_ = GetThisObject(); 2390 } 2391 method_ = m; 2392 dex_pc_ = GetDexPc(abort_on_error_); 2393 return false; 2394 } 2395 mirror::Object* this_object_; 2396 ArtMethod* method_; 2397 uint32_t dex_pc_; 2398 const bool abort_on_error_; 2399}; 2400 2401ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 2402 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 2403 visitor.WalkStack(false); 2404 if (dex_pc != nullptr) { 2405 *dex_pc = visitor.dex_pc_; 2406 } 2407 return visitor.method_; 2408} 2409 2410bool Thread::HoldsLock(mirror::Object* object) const { 2411 if (object == nullptr) { 2412 return false; 2413 } 2414 return object->GetLockOwnerThreadId() == GetThreadId(); 2415} 2416 2417// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2418template <typename RootVisitor> 2419class ReferenceMapVisitor : public StackVisitor { 2420 public: 2421 ReferenceMapVisitor(Thread* thread, Context* context, RootVisitor& visitor) 2422 SHARED_REQUIRES(Locks::mutator_lock_) 2423 // We are visiting the references in compiled frames, so we do not need 2424 // to know the inlined frames. 2425 : StackVisitor(thread, context, StackVisitor::StackWalkKind::kSkipInlinedFrames), 2426 visitor_(visitor) {} 2427 2428 bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 2429 if (false) { 2430 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2431 << StringPrintf("@ PC:%04x", GetDexPc()); 2432 } 2433 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2434 if (shadow_frame != nullptr) { 2435 VisitShadowFrame(shadow_frame); 2436 } else { 2437 VisitQuickFrame(); 2438 } 2439 return true; 2440 } 2441 2442 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_REQUIRES(Locks::mutator_lock_) { 2443 ArtMethod* m = shadow_frame->GetMethod(); 2444 VisitDeclaringClass(m); 2445 DCHECK(m != nullptr); 2446 size_t num_regs = shadow_frame->NumberOfVRegs(); 2447 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2448 // handle scope for JNI or References for interpreter. 2449 for (size_t reg = 0; reg < num_regs; ++reg) { 2450 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2451 if (ref != nullptr) { 2452 mirror::Object* new_ref = ref; 2453 visitor_(&new_ref, reg, this); 2454 if (new_ref != ref) { 2455 shadow_frame->SetVRegReference(reg, new_ref); 2456 } 2457 } 2458 } 2459 } else { 2460 // Java method. 2461 // Portable path use DexGcMap and store in Method.native_gc_map_. 2462 const uint8_t* gc_map = m->GetNativeGcMap(sizeof(void*)); 2463 CHECK(gc_map != nullptr) << PrettyMethod(m); 2464 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2465 uint32_t dex_pc = shadow_frame->GetDexPC(); 2466 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2467 DCHECK(reg_bitmap != nullptr); 2468 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2469 for (size_t reg = 0; reg < num_regs; ++reg) { 2470 if (TestBitmap(reg, reg_bitmap)) { 2471 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2472 if (ref != nullptr) { 2473 mirror::Object* new_ref = ref; 2474 visitor_(&new_ref, reg, this); 2475 if (new_ref != ref) { 2476 shadow_frame->SetVRegReference(reg, new_ref); 2477 } 2478 } 2479 } 2480 } 2481 } 2482 } 2483 2484 private: 2485 // Visiting the declaring class is necessary so that we don't unload the class of a method that 2486 // is executing. We need to ensure that the code stays mapped. 2487 void VisitDeclaringClass(ArtMethod* method) SHARED_REQUIRES(Locks::mutator_lock_) { 2488 mirror::Class* klass = method->GetDeclaringClassNoBarrier(); 2489 // klass can be null for runtime methods. 2490 if (klass != nullptr) { 2491 mirror::Object* new_ref = klass; 2492 visitor_(&new_ref, -1, this); 2493 if (new_ref != klass) { 2494 method->CASDeclaringClass(klass, new_ref->AsClass()); 2495 } 2496 } 2497 } 2498 2499 void VisitQuickFrame() SHARED_REQUIRES(Locks::mutator_lock_) { 2500 ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 2501 DCHECK(cur_quick_frame != nullptr); 2502 ArtMethod* m = *cur_quick_frame; 2503 VisitDeclaringClass(m); 2504 2505 // Process register map (which native and runtime methods don't have) 2506 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2507 if (m->IsOptimized(sizeof(void*))) { 2508 auto* vreg_base = reinterpret_cast<StackReference<mirror::Object>*>( 2509 reinterpret_cast<uintptr_t>(cur_quick_frame)); 2510 Runtime* runtime = Runtime::Current(); 2511 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2512 uintptr_t native_pc_offset = m->NativeQuickPcOffset(GetCurrentQuickFramePc(), entry_point); 2513 CodeInfo code_info = m->GetOptimizedCodeInfo(); 2514 StackMapEncoding encoding = code_info.ExtractEncoding(); 2515 StackMap map = code_info.GetStackMapForNativePcOffset(native_pc_offset, encoding); 2516 DCHECK(map.IsValid()); 2517 MemoryRegion mask = map.GetStackMask(encoding); 2518 // Visit stack entries that hold pointers. 2519 for (size_t i = 0; i < mask.size_in_bits(); ++i) { 2520 if (mask.LoadBit(i)) { 2521 auto* ref_addr = vreg_base + i; 2522 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2523 if (ref != nullptr) { 2524 mirror::Object* new_ref = ref; 2525 visitor_(&new_ref, -1, this); 2526 if (ref != new_ref) { 2527 ref_addr->Assign(new_ref); 2528 } 2529 } 2530 } 2531 } 2532 // Visit callee-save registers that hold pointers. 2533 uint32_t register_mask = map.GetRegisterMask(encoding); 2534 for (size_t i = 0; i < BitSizeOf<uint32_t>(); ++i) { 2535 if (register_mask & (1 << i)) { 2536 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(i)); 2537 if (*ref_addr != nullptr) { 2538 visitor_(ref_addr, -1, this); 2539 } 2540 } 2541 } 2542 } else { 2543 const uint8_t* native_gc_map = m->GetNativeGcMap(sizeof(void*)); 2544 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2545 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2546 // Can't be null or how would we compile its instructions? 2547 DCHECK(code_item != nullptr) << PrettyMethod(m); 2548 NativePcOffsetToReferenceMap map(native_gc_map); 2549 size_t num_regs = map.RegWidth() * 8; 2550 if (num_regs > 0) { 2551 Runtime* runtime = Runtime::Current(); 2552 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2553 uintptr_t native_pc_offset = m->NativeQuickPcOffset(GetCurrentQuickFramePc(), entry_point); 2554 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2555 DCHECK(reg_bitmap != nullptr); 2556 const void* code_pointer = ArtMethod::EntryPointToCodePointer(entry_point); 2557 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 2558 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2559 // For all dex registers in the bitmap 2560 DCHECK(cur_quick_frame != nullptr); 2561 for (size_t reg = 0; reg < num_regs; ++reg) { 2562 // Does this register hold a reference? 2563 if (TestBitmap(reg, reg_bitmap)) { 2564 uint32_t vmap_offset; 2565 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2566 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2567 kReferenceVReg); 2568 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2569 mirror::Object** ref_addr = 2570 reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2571 if (*ref_addr != nullptr) { 2572 visitor_(ref_addr, reg, this); 2573 } 2574 } else { 2575 StackReference<mirror::Object>* ref_addr = 2576 reinterpret_cast<StackReference<mirror::Object>*>(GetVRegAddrFromQuickCode( 2577 cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2578 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2579 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2580 if (ref != nullptr) { 2581 mirror::Object* new_ref = ref; 2582 visitor_(&new_ref, reg, this); 2583 if (ref != new_ref) { 2584 ref_addr->Assign(new_ref); 2585 } 2586 } 2587 } 2588 } 2589 } 2590 } 2591 } 2592 } 2593 } 2594 2595 // Visitor for when we visit a root. 2596 RootVisitor& visitor_; 2597}; 2598 2599class RootCallbackVisitor { 2600 public: 2601 RootCallbackVisitor(RootVisitor* visitor, uint32_t tid) : visitor_(visitor), tid_(tid) {} 2602 2603 void operator()(mirror::Object** obj, size_t vreg, const StackVisitor* stack_visitor) const 2604 SHARED_REQUIRES(Locks::mutator_lock_) { 2605 visitor_->VisitRoot(obj, JavaFrameRootInfo(tid_, stack_visitor, vreg)); 2606 } 2607 2608 private: 2609 RootVisitor* const visitor_; 2610 const uint32_t tid_; 2611}; 2612 2613void Thread::VisitRoots(RootVisitor* visitor) { 2614 const uint32_t thread_id = GetThreadId(); 2615 visitor->VisitRootIfNonNull(&tlsPtr_.opeer, RootInfo(kRootThreadObject, thread_id)); 2616 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2617 visitor->VisitRoot(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), 2618 RootInfo(kRootNativeStack, thread_id)); 2619 } 2620 visitor->VisitRootIfNonNull(&tlsPtr_.monitor_enter_object, RootInfo(kRootNativeStack, thread_id)); 2621 tlsPtr_.jni_env->locals.VisitRoots(visitor, RootInfo(kRootJNILocal, thread_id)); 2622 tlsPtr_.jni_env->monitors.VisitRoots(visitor, RootInfo(kRootJNIMonitor, thread_id)); 2623 HandleScopeVisitRoots(visitor, thread_id); 2624 if (tlsPtr_.debug_invoke_req != nullptr) { 2625 tlsPtr_.debug_invoke_req->VisitRoots(visitor, RootInfo(kRootDebugger, thread_id)); 2626 } 2627 // Visit roots for deoptimization. 2628 if (tlsPtr_.stacked_shadow_frame_record != nullptr) { 2629 RootCallbackVisitor visitor_to_callback(visitor, thread_id); 2630 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitor_to_callback); 2631 for (StackedShadowFrameRecord* record = tlsPtr_.stacked_shadow_frame_record; 2632 record != nullptr; 2633 record = record->GetLink()) { 2634 for (ShadowFrame* shadow_frame = record->GetShadowFrame(); 2635 shadow_frame != nullptr; 2636 shadow_frame = shadow_frame->GetLink()) { 2637 mapper.VisitShadowFrame(shadow_frame); 2638 } 2639 } 2640 } 2641 if (tlsPtr_.deoptimization_context_stack != nullptr) { 2642 for (DeoptimizationContextRecord* record = tlsPtr_.deoptimization_context_stack; 2643 record != nullptr; 2644 record = record->GetLink()) { 2645 if (record->IsReference()) { 2646 visitor->VisitRootIfNonNull(record->GetReturnValueAsGCRoot(), 2647 RootInfo(kRootThreadObject, thread_id)); 2648 } 2649 visitor->VisitRootIfNonNull(record->GetPendingExceptionAsGCRoot(), 2650 RootInfo(kRootThreadObject, thread_id)); 2651 } 2652 } 2653 for (auto* verifier = tlsPtr_.method_verifier; verifier != nullptr; verifier = verifier->link_) { 2654 verifier->VisitRoots(visitor, RootInfo(kRootNativeStack, thread_id)); 2655 } 2656 // Visit roots on this thread's stack 2657 Context* context = GetLongJumpContext(); 2658 RootCallbackVisitor visitor_to_callback(visitor, thread_id); 2659 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitor_to_callback); 2660 mapper.WalkStack(); 2661 ReleaseLongJumpContext(context); 2662 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2663 visitor->VisitRootIfNonNull(&frame.this_object_, RootInfo(kRootVMInternal, thread_id)); 2664 } 2665} 2666 2667class VerifyRootVisitor : public SingleRootVisitor { 2668 public: 2669 void VisitRoot(mirror::Object* root, const RootInfo& info ATTRIBUTE_UNUSED) 2670 OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) { 2671 VerifyObject(root); 2672 } 2673}; 2674 2675void Thread::VerifyStackImpl() { 2676 VerifyRootVisitor visitor; 2677 std::unique_ptr<Context> context(Context::Create()); 2678 RootCallbackVisitor visitor_to_callback(&visitor, GetThreadId()); 2679 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitor_to_callback); 2680 mapper.WalkStack(); 2681} 2682 2683// Set the stack end to that to be used during a stack overflow 2684void Thread::SetStackEndForStackOverflow() { 2685 // During stack overflow we allow use of the full stack. 2686 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2687 // However, we seem to have already extended to use the full stack. 2688 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2689 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2690 DumpStack(LOG(ERROR)); 2691 LOG(FATAL) << "Recursive stack overflow."; 2692 } 2693 2694 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2695 2696 // Remove the stack overflow protection if is it set up. 2697 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2698 if (implicit_stack_check) { 2699 if (!UnprotectStack()) { 2700 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2701 } 2702 } 2703} 2704 2705void Thread::SetTlab(uint8_t* start, uint8_t* end) { 2706 DCHECK_LE(start, end); 2707 tlsPtr_.thread_local_start = start; 2708 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2709 tlsPtr_.thread_local_end = end; 2710 tlsPtr_.thread_local_objects = 0; 2711} 2712 2713bool Thread::HasTlab() const { 2714 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2715 if (has_tlab) { 2716 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2717 } else { 2718 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2719 } 2720 return has_tlab; 2721} 2722 2723std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2724 thread.ShortDump(os); 2725 return os; 2726} 2727 2728void Thread::ProtectStack() { 2729 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2730 VLOG(threads) << "Protecting stack at " << pregion; 2731 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2732 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2733 "Reason: " 2734 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2735 } 2736} 2737 2738bool Thread::UnprotectStack() { 2739 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2740 VLOG(threads) << "Unprotecting stack at " << pregion; 2741 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2742} 2743 2744void Thread::ActivateSingleStepControl(SingleStepControl* ssc) { 2745 CHECK(Dbg::IsDebuggerActive()); 2746 CHECK(GetSingleStepControl() == nullptr) << "Single step already active in thread " << *this; 2747 CHECK(ssc != nullptr); 2748 tlsPtr_.single_step_control = ssc; 2749} 2750 2751void Thread::DeactivateSingleStepControl() { 2752 CHECK(Dbg::IsDebuggerActive()); 2753 CHECK(GetSingleStepControl() != nullptr) << "Single step not active in thread " << *this; 2754 SingleStepControl* ssc = GetSingleStepControl(); 2755 tlsPtr_.single_step_control = nullptr; 2756 delete ssc; 2757} 2758 2759void Thread::SetDebugInvokeReq(DebugInvokeReq* req) { 2760 CHECK(Dbg::IsDebuggerActive()); 2761 CHECK(GetInvokeReq() == nullptr) << "Debug invoke req already active in thread " << *this; 2762 CHECK(Thread::Current() != this) << "Debug invoke can't be dispatched by the thread itself"; 2763 CHECK(req != nullptr); 2764 tlsPtr_.debug_invoke_req = req; 2765} 2766 2767void Thread::ClearDebugInvokeReq() { 2768 CHECK(GetInvokeReq() != nullptr) << "Debug invoke req not active in thread " << *this; 2769 CHECK(Thread::Current() == this) << "Debug invoke must be finished by the thread itself"; 2770 DebugInvokeReq* req = tlsPtr_.debug_invoke_req; 2771 tlsPtr_.debug_invoke_req = nullptr; 2772 delete req; 2773} 2774 2775void Thread::PushVerifier(verifier::MethodVerifier* verifier) { 2776 verifier->link_ = tlsPtr_.method_verifier; 2777 tlsPtr_.method_verifier = verifier; 2778} 2779 2780void Thread::PopVerifier(verifier::MethodVerifier* verifier) { 2781 CHECK_EQ(tlsPtr_.method_verifier, verifier); 2782 tlsPtr_.method_verifier = verifier->link_; 2783} 2784 2785size_t Thread::NumberOfHeldMutexes() const { 2786 size_t count = 0; 2787 for (BaseMutex* mu : tlsPtr_.held_mutexes) { 2788 count += mu != nullptr ? 1 : 0; 2789 } 2790 return count; 2791} 2792 2793} // namespace art 2794