thread.cc revision 21ecab6effd08ed781d55fbb53b0e71c526c25fa
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define ATRACE_TAG ATRACE_TAG_DALVIK 18 19#include "thread.h" 20 21#include <cutils/trace.h> 22#include <pthread.h> 23#include <signal.h> 24#include <sys/resource.h> 25#include <sys/time.h> 26 27#include <algorithm> 28#include <bitset> 29#include <cerrno> 30#include <iostream> 31#include <list> 32 33#include "arch/context.h" 34#include "base/mutex.h" 35#include "class_linker-inl.h" 36#include "class_linker.h" 37#include "debugger.h" 38#include "dex_file-inl.h" 39#include "entrypoints/entrypoint_utils.h" 40#include "entrypoints/quick/quick_alloc_entrypoints.h" 41#include "gc_map.h" 42#include "gc/accounting/card_table-inl.h" 43#include "gc/allocator/rosalloc.h" 44#include "gc/heap.h" 45#include "gc/space/space.h" 46#include "handle_scope-inl.h" 47#include "handle_scope.h" 48#include "indirect_reference_table-inl.h" 49#include "jni_internal.h" 50#include "mirror/art_field-inl.h" 51#include "mirror/art_method-inl.h" 52#include "mirror/class_loader.h" 53#include "mirror/class-inl.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/stack_trace_element.h" 56#include "monitor.h" 57#include "object_lock.h" 58#include "quick_exception_handler.h" 59#include "quick/quick_method_frame_info.h" 60#include "reflection.h" 61#include "runtime.h" 62#include "scoped_thread_state_change.h" 63#include "ScopedLocalRef.h" 64#include "ScopedUtfChars.h" 65#include "stack.h" 66#include "thread_list.h" 67#include "thread-inl.h" 68#include "utils.h" 69#include "verifier/dex_gc_map.h" 70#include "verify_object-inl.h" 71#include "vmap_table.h" 72#include "well_known_classes.h" 73 74namespace art { 75 76bool Thread::is_started_ = false; 77pthread_key_t Thread::pthread_key_self_; 78ConditionVariable* Thread::resume_cond_ = nullptr; 79const size_t Thread::kStackOverflowImplicitCheckSize = GetStackOverflowReservedBytes(kRuntimeISA); 80 81static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 82 83void Thread::InitCardTable() { 84 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 85} 86 87static void UnimplementedEntryPoint() { 88 UNIMPLEMENTED(FATAL); 89} 90 91void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 92 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 93 94void Thread::InitTlsEntryPoints() { 95 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 96 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 97 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + 98 sizeof(tlsPtr_.quick_entrypoints)); 99 for (uintptr_t* it = begin; it != end; ++it) { 100 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 101 } 102 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 103 &tlsPtr_.portable_entrypoints, &tlsPtr_.quick_entrypoints); 104} 105 106void Thread::ResetQuickAllocEntryPointsForThread() { 107 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 108} 109 110void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 111 tlsPtr_.deoptimization_shadow_frame = sf; 112} 113 114void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 115 tls64_.deoptimization_return_value.SetJ(ret_val.GetJ()); 116} 117 118ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 119 ShadowFrame* sf = tlsPtr_.deoptimization_shadow_frame; 120 tlsPtr_.deoptimization_shadow_frame = nullptr; 121 ret_val->SetJ(tls64_.deoptimization_return_value.GetJ()); 122 return sf; 123} 124 125void Thread::SetShadowFrameUnderConstruction(ShadowFrame* sf) { 126 sf->SetLink(tlsPtr_.shadow_frame_under_construction); 127 tlsPtr_.shadow_frame_under_construction = sf; 128} 129 130void Thread::ClearShadowFrameUnderConstruction() { 131 CHECK_NE(static_cast<ShadowFrame*>(nullptr), tlsPtr_.shadow_frame_under_construction); 132 tlsPtr_.shadow_frame_under_construction = tlsPtr_.shadow_frame_under_construction->GetLink(); 133} 134 135void Thread::InitTid() { 136 tls32_.tid = ::art::GetTid(); 137} 138 139void Thread::InitAfterFork() { 140 // One thread (us) survived the fork, but we have a new tid so we need to 141 // update the value stashed in this Thread*. 142 InitTid(); 143} 144 145void* Thread::CreateCallback(void* arg) { 146 Thread* self = reinterpret_cast<Thread*>(arg); 147 Runtime* runtime = Runtime::Current(); 148 if (runtime == nullptr) { 149 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 150 return nullptr; 151 } 152 { 153 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 154 // after self->Init(). 155 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 156 // Check that if we got here we cannot be shutting down (as shutdown should never have started 157 // while threads are being born). 158 CHECK(!runtime->IsShuttingDownLocked()); 159 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 160 Runtime::Current()->EndThreadBirth(); 161 } 162 { 163 ScopedObjectAccess soa(self); 164 165 // Copy peer into self, deleting global reference when done. 166 CHECK(self->tlsPtr_.jpeer != nullptr); 167 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 168 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 169 self->tlsPtr_.jpeer = nullptr; 170 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 171 Dbg::PostThreadStart(self); 172 173 // Invoke the 'run' method of our java.lang.Thread. 174 mirror::Object* receiver = self->tlsPtr_.opeer; 175 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 176 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 177 } 178 // Detach and delete self. 179 Runtime::Current()->GetThreadList()->Unregister(self); 180 181 return nullptr; 182} 183 184Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 185 mirror::Object* thread_peer) { 186 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 187 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 188 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 189 // to stop it from going away. 190 if (kIsDebugBuild) { 191 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 192 if (result != nullptr && !result->IsSuspended()) { 193 Locks::thread_list_lock_->AssertHeld(soa.Self()); 194 } 195 } 196 return result; 197} 198 199Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 200 jobject java_thread) { 201 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 202} 203 204static size_t FixStackSize(size_t stack_size) { 205 // A stack size of zero means "use the default". 206 if (stack_size == 0) { 207 stack_size = Runtime::Current()->GetDefaultStackSize(); 208 } 209 210 // Dalvik used the bionic pthread default stack size for native threads, 211 // so include that here to support apps that expect large native stacks. 212 stack_size += 1 * MB; 213 214 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 215 if (stack_size < PTHREAD_STACK_MIN) { 216 stack_size = PTHREAD_STACK_MIN; 217 } 218 219 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 220 // It's likely that callers are trying to ensure they have at least a certain amount of 221 // stack space, so we should add our reserved space on top of what they requested, rather 222 // than implicitly take it away from them. 223 stack_size += GetStackOverflowReservedBytes(kRuntimeISA); 224 } else { 225 // If we are going to use implicit stack checks, allocate space for the protected 226 // region at the bottom of the stack. 227 stack_size += Thread::kStackOverflowImplicitCheckSize + 228 GetStackOverflowReservedBytes(kRuntimeISA); 229 } 230 231 // Some systems require the stack size to be a multiple of the system page size, so round up. 232 stack_size = RoundUp(stack_size, kPageSize); 233 234 return stack_size; 235} 236 237// Global variable to prevent the compiler optimizing away the page reads for the stack. 238byte dont_optimize_this; 239 240// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 241// overflow is detected. It is located right below the stack_begin_. 242// 243// There is a little complexity here that deserves a special mention. On some 244// architectures, the stack created using a VM_GROWSDOWN flag 245// to prevent memory being allocated when it's not needed. This flag makes the 246// kernel only allocate memory for the stack by growing down in memory. Because we 247// want to put an mprotected region far away from that at the stack top, we need 248// to make sure the pages for the stack are mapped in before we call mprotect. We do 249// this by reading every page from the stack bottom (highest address) to the stack top. 250// We then madvise this away. 251void Thread::InstallImplicitProtection() { 252 byte* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 253 byte* stack_himem = tlsPtr_.stack_end; 254 byte* stack_top = reinterpret_cast<byte*>(reinterpret_cast<uintptr_t>(&stack_himem) & 255 ~(kPageSize - 1)); // Page containing current top of stack. 256 257 // First remove the protection on the protected region as will want to read and 258 // write it. This may fail (on the first attempt when the stack is not mapped) 259 // but we ignore that. 260 UnprotectStack(); 261 262 // Map in the stack. This must be done by reading from the 263 // current stack pointer downwards as the stack may be mapped using VM_GROWSDOWN 264 // in the kernel. Any access more than a page below the current SP might cause 265 // a segv. 266 267 // Read every page from the high address to the low. 268 for (byte* p = stack_top; p >= pregion; p -= kPageSize) { 269 dont_optimize_this = *p; 270 } 271 272 VLOG(threads) << "installing stack protected region at " << std::hex << 273 static_cast<void*>(pregion) << " to " << 274 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 275 276 // Protect the bottom of the stack to prevent read/write to it. 277 ProtectStack(); 278 279 // Tell the kernel that we won't be needing these pages any more. 280 // NB. madvise will probably write zeroes into the memory (on linux it does). 281 uint32_t unwanted_size = stack_top - pregion - kPageSize; 282 madvise(pregion, unwanted_size, MADV_DONTNEED); 283} 284 285void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 286 CHECK(java_peer != nullptr); 287 Thread* self = static_cast<JNIEnvExt*>(env)->self; 288 Runtime* runtime = Runtime::Current(); 289 290 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 291 bool thread_start_during_shutdown = false; 292 { 293 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 294 if (runtime->IsShuttingDownLocked()) { 295 thread_start_during_shutdown = true; 296 } else { 297 runtime->StartThreadBirth(); 298 } 299 } 300 if (thread_start_during_shutdown) { 301 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 302 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 303 return; 304 } 305 306 Thread* child_thread = new Thread(is_daemon); 307 // Use global JNI ref to hold peer live while child thread starts. 308 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 309 stack_size = FixStackSize(stack_size); 310 311 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 312 // assign it. 313 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 314 reinterpret_cast<jlong>(child_thread)); 315 316 pthread_t new_pthread; 317 pthread_attr_t attr; 318 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 319 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 320 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 321 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 322 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 323 324 if (pthread_create_result != 0) { 325 // pthread_create(3) failed, so clean up. 326 { 327 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 328 runtime->EndThreadBirth(); 329 } 330 // Manually delete the global reference since Thread::Init will not have been run. 331 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 332 child_thread->tlsPtr_.jpeer = nullptr; 333 delete child_thread; 334 child_thread = nullptr; 335 // TODO: remove from thread group? 336 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 337 { 338 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 339 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 340 ScopedObjectAccess soa(env); 341 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 342 } 343 } 344} 345 346void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 347 // This function does all the initialization that must be run by the native thread it applies to. 348 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 349 // we can handshake with the corresponding native thread when it's ready.) Check this native 350 // thread hasn't been through here already... 351 CHECK(Thread::Current() == nullptr); 352 SetUpAlternateSignalStack(); 353 InitCpu(); 354 InitTlsEntryPoints(); 355 RemoveSuspendTrigger(); 356 InitCardTable(); 357 InitTid(); 358 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 359 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 360 tlsPtr_.pthread_self = pthread_self(); 361 CHECK(is_started_); 362 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 363 DCHECK_EQ(Thread::Current(), this); 364 365 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 366 InitStackHwm(); 367 368 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 369 thread_list->Register(this); 370} 371 372Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 373 bool create_peer) { 374 Thread* self; 375 Runtime* runtime = Runtime::Current(); 376 if (runtime == nullptr) { 377 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 378 return nullptr; 379 } 380 { 381 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 382 if (runtime->IsShuttingDownLocked()) { 383 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 384 return nullptr; 385 } else { 386 Runtime::Current()->StartThreadBirth(); 387 self = new Thread(as_daemon); 388 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 389 Runtime::Current()->EndThreadBirth(); 390 } 391 } 392 393 CHECK_NE(self->GetState(), kRunnable); 394 self->SetState(kNative); 395 396 // If we're the main thread, ClassLinker won't be created until after we're attached, 397 // so that thread needs a two-stage attach. Regular threads don't need this hack. 398 // In the compiler, all threads need this hack, because no-one's going to be getting 399 // a native peer! 400 if (create_peer) { 401 self->CreatePeer(thread_name, as_daemon, thread_group); 402 } else { 403 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 404 if (thread_name != nullptr) { 405 self->tlsPtr_.name->assign(thread_name); 406 ::art::SetThreadName(thread_name); 407 } else if (self->GetJniEnv()->check_jni) { 408 LOG(WARNING) << *Thread::Current() << " attached without supplying a name"; 409 } 410 } 411 412 return self; 413} 414 415void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 416 Runtime* runtime = Runtime::Current(); 417 CHECK(runtime->IsStarted()); 418 JNIEnv* env = tlsPtr_.jni_env; 419 420 if (thread_group == nullptr) { 421 thread_group = runtime->GetMainThreadGroup(); 422 } 423 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 424 jint thread_priority = GetNativePriority(); 425 jboolean thread_is_daemon = as_daemon; 426 427 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 428 if (peer.get() == nullptr) { 429 CHECK(IsExceptionPending()); 430 return; 431 } 432 { 433 ScopedObjectAccess soa(this); 434 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 435 } 436 env->CallNonvirtualVoidMethod(peer.get(), 437 WellKnownClasses::java_lang_Thread, 438 WellKnownClasses::java_lang_Thread_init, 439 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 440 AssertNoPendingException(); 441 442 Thread* self = this; 443 DCHECK_EQ(self, Thread::Current()); 444 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 445 reinterpret_cast<jlong>(self)); 446 447 ScopedObjectAccess soa(self); 448 StackHandleScope<1> hs(self); 449 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 450 if (peer_thread_name.Get() == nullptr) { 451 // The Thread constructor should have set the Thread.name to a 452 // non-null value. However, because we can run without code 453 // available (in the compiler, in tests), we manually assign the 454 // fields the constructor should have set. 455 if (runtime->IsActiveTransaction()) { 456 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 457 } else { 458 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 459 } 460 peer_thread_name.Assign(GetThreadName(soa)); 461 } 462 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 463 if (peer_thread_name.Get() != nullptr) { 464 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 465 } 466} 467 468template<bool kTransactionActive> 469void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 470 jobject thread_name, jint thread_priority) { 471 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 472 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 473 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 474 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 475 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 476 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 477 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 478 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 479} 480 481void Thread::SetThreadName(const char* name) { 482 tlsPtr_.name->assign(name); 483 ::art::SetThreadName(name); 484 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 485} 486 487void Thread::InitStackHwm() { 488 void* read_stack_base; 489 size_t read_stack_size; 490 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 491 492 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 493 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 494 PrettySize(read_stack_size).c_str()); 495 496 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 497 tlsPtr_.stack_size = read_stack_size; 498 499 // The minimum stack size we can cope with is the overflow reserved bytes (typically 500 // 8K) + the protected region size (4K) + another page (4K). Typically this will 501 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 502 // between 8K and 12K. 503 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 504 + 4 * KB; 505 if (read_stack_size <= min_stack) { 506 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 507 << " bytes)"; 508 } 509 510 // TODO: move this into the Linux GetThreadStack implementation. 511#if !defined(__APPLE__) 512 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 513 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 514 // will be broken because we'll die long before we get close to 2GB. 515 bool is_main_thread = (::art::GetTid() == getpid()); 516 if (is_main_thread) { 517 rlimit stack_limit; 518 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 519 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 520 } 521 if (stack_limit.rlim_cur == RLIM_INFINITY) { 522 // Find the default stack size for new threads... 523 pthread_attr_t default_attributes; 524 size_t default_stack_size; 525 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 526 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 527 "default stack size query"); 528 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 529 530 // ...and use that as our limit. 531 size_t old_stack_size = read_stack_size; 532 tlsPtr_.stack_size = default_stack_size; 533 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 534 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 535 << " to " << PrettySize(default_stack_size) 536 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 537 } 538 } 539#endif 540 541 // Set stack_end_ to the bottom of the stack saving space of stack overflows 542 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 543 ResetDefaultStackEnd(); 544 545 // Install the protected region if we are doing implicit overflow checks. 546 if (implicit_stack_check) { 547 size_t guardsize; 548 pthread_attr_t attributes; 549 CHECK_PTHREAD_CALL(pthread_attr_init, (&attributes), "guard size query"); 550 CHECK_PTHREAD_CALL(pthread_attr_getguardsize, (&attributes, &guardsize), "guard size query"); 551 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attributes), "guard size query"); 552 // The thread might have protected region at the bottom. We need 553 // to install our own region so we need to move the limits 554 // of the stack to make room for it. 555 tlsPtr_.stack_begin += guardsize + kStackOverflowProtectedSize; 556 tlsPtr_.stack_end += guardsize + kStackOverflowProtectedSize; 557 tlsPtr_.stack_size -= guardsize; 558 559 InstallImplicitProtection(); 560 } 561 562 // Sanity check. 563 int stack_variable; 564 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 565} 566 567void Thread::ShortDump(std::ostream& os) const { 568 os << "Thread["; 569 if (GetThreadId() != 0) { 570 // If we're in kStarting, we won't have a thin lock id or tid yet. 571 os << GetThreadId() 572 << ",tid=" << GetTid() << ','; 573 } 574 os << GetState() 575 << ",Thread*=" << this 576 << ",peer=" << tlsPtr_.opeer 577 << ",\"" << *tlsPtr_.name << "\"" 578 << "]"; 579} 580 581void Thread::Dump(std::ostream& os) const { 582 DumpState(os); 583 DumpStack(os); 584} 585 586mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 587 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 588 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 589} 590 591void Thread::GetThreadName(std::string& name) const { 592 name.assign(*tlsPtr_.name); 593} 594 595uint64_t Thread::GetCpuMicroTime() const { 596#if defined(HAVE_POSIX_CLOCKS) 597 clockid_t cpu_clock_id; 598 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 599 timespec now; 600 clock_gettime(cpu_clock_id, &now); 601 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 602#else 603 UNIMPLEMENTED(WARNING); 604 return -1; 605#endif 606} 607 608// Attempt to rectify locks so that we dump thread list with required locks before exiting. 609static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 610 LOG(ERROR) << *thread << " suspend count already zero."; 611 Locks::thread_suspend_count_lock_->Unlock(self); 612 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 613 Locks::mutator_lock_->SharedTryLock(self); 614 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 615 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 616 } 617 } 618 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 619 Locks::thread_list_lock_->TryLock(self); 620 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 621 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 622 } 623 } 624 std::ostringstream ss; 625 Runtime::Current()->GetThreadList()->DumpLocked(ss); 626 LOG(FATAL) << ss.str(); 627} 628 629void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 630 if (kIsDebugBuild) { 631 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 632 << delta << " " << tls32_.debug_suspend_count << " " << this; 633 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 634 Locks::thread_suspend_count_lock_->AssertHeld(self); 635 if (this != self && !IsSuspended()) { 636 Locks::thread_list_lock_->AssertHeld(self); 637 } 638 } 639 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 640 UnsafeLogFatalForSuspendCount(self, this); 641 return; 642 } 643 644 tls32_.suspend_count += delta; 645 if (for_debugger) { 646 tls32_.debug_suspend_count += delta; 647 } 648 649 if (tls32_.suspend_count == 0) { 650 AtomicClearFlag(kSuspendRequest); 651 } else { 652 AtomicSetFlag(kSuspendRequest); 653 TriggerSuspend(); 654 } 655} 656 657void Thread::RunCheckpointFunction() { 658 Closure *checkpoints[kMaxCheckpoints]; 659 660 // Grab the suspend_count lock and copy the current set of 661 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 662 // function will also grab this lock so we prevent a race between setting 663 // the kCheckpointRequest flag and clearing it. 664 { 665 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 666 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 667 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 668 tlsPtr_.checkpoint_functions[i] = nullptr; 669 } 670 AtomicClearFlag(kCheckpointRequest); 671 } 672 673 // Outside the lock, run all the checkpoint functions that 674 // we collected. 675 bool found_checkpoint = false; 676 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 677 if (checkpoints[i] != nullptr) { 678 ATRACE_BEGIN("Checkpoint function"); 679 checkpoints[i]->Run(this); 680 ATRACE_END(); 681 found_checkpoint = true; 682 } 683 } 684 CHECK(found_checkpoint); 685} 686 687bool Thread::RequestCheckpoint(Closure* function) { 688 union StateAndFlags old_state_and_flags; 689 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 690 if (old_state_and_flags.as_struct.state != kRunnable) { 691 return false; // Fail, thread is suspended and so can't run a checkpoint. 692 } 693 694 uint32_t available_checkpoint = kMaxCheckpoints; 695 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 696 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 697 available_checkpoint = i; 698 break; 699 } 700 } 701 if (available_checkpoint == kMaxCheckpoints) { 702 // No checkpoint functions available, we can't run a checkpoint 703 return false; 704 } 705 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 706 707 // Checkpoint function installed now install flag bit. 708 // We must be runnable to request a checkpoint. 709 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 710 union StateAndFlags new_state_and_flags; 711 new_state_and_flags.as_int = old_state_and_flags.as_int; 712 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 713 bool success = 714 tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent(old_state_and_flags.as_int, 715 new_state_and_flags.as_int); 716 if (UNLIKELY(!success)) { 717 // The thread changed state before the checkpoint was installed. 718 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 719 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 720 } else { 721 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 722 TriggerSuspend(); 723 } 724 return success; 725} 726 727void Thread::FullSuspendCheck() { 728 VLOG(threads) << this << " self-suspending"; 729 ATRACE_BEGIN("Full suspend check"); 730 // Make thread appear suspended to other threads, release mutator_lock_. 731 TransitionFromRunnableToSuspended(kSuspended); 732 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 733 TransitionFromSuspendedToRunnable(); 734 ATRACE_END(); 735 VLOG(threads) << this << " self-reviving"; 736} 737 738void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 739 std::string group_name; 740 int priority; 741 bool is_daemon = false; 742 Thread* self = Thread::Current(); 743 744 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 745 // cause ScopedObjectAccessUnchecked to deadlock. 746 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 747 ScopedObjectAccessUnchecked soa(self); 748 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 749 ->GetInt(thread->tlsPtr_.opeer); 750 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 751 ->GetBoolean(thread->tlsPtr_.opeer); 752 753 mirror::Object* thread_group = 754 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 755 756 if (thread_group != nullptr) { 757 mirror::ArtField* group_name_field = 758 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 759 mirror::String* group_name_string = 760 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 761 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 762 } 763 } else { 764 priority = GetNativePriority(); 765 } 766 767 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 768 if (scheduler_group_name.empty()) { 769 scheduler_group_name = "default"; 770 } 771 772 if (thread != nullptr) { 773 os << '"' << *thread->tlsPtr_.name << '"'; 774 if (is_daemon) { 775 os << " daemon"; 776 } 777 os << " prio=" << priority 778 << " tid=" << thread->GetThreadId() 779 << " " << thread->GetState(); 780 if (thread->IsStillStarting()) { 781 os << " (still starting up)"; 782 } 783 os << "\n"; 784 } else { 785 os << '"' << ::art::GetThreadName(tid) << '"' 786 << " prio=" << priority 787 << " (not attached)\n"; 788 } 789 790 if (thread != nullptr) { 791 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 792 os << " | group=\"" << group_name << "\"" 793 << " sCount=" << thread->tls32_.suspend_count 794 << " dsCount=" << thread->tls32_.debug_suspend_count 795 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 796 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 797 } 798 799 os << " | sysTid=" << tid 800 << " nice=" << getpriority(PRIO_PROCESS, tid) 801 << " cgrp=" << scheduler_group_name; 802 if (thread != nullptr) { 803 int policy; 804 sched_param sp; 805 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 806 __FUNCTION__); 807 os << " sched=" << policy << "/" << sp.sched_priority 808 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 809 } 810 os << "\n"; 811 812 // Grab the scheduler stats for this thread. 813 std::string scheduler_stats; 814 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 815 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 816 } else { 817 scheduler_stats = "0 0 0"; 818 } 819 820 char native_thread_state = '?'; 821 int utime = 0; 822 int stime = 0; 823 int task_cpu = 0; 824 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 825 826 os << " | state=" << native_thread_state 827 << " schedstat=( " << scheduler_stats << " )" 828 << " utm=" << utime 829 << " stm=" << stime 830 << " core=" << task_cpu 831 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 832 if (thread != nullptr) { 833 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 834 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 835 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 836 // Dump the held mutexes. 837 os << " | held mutexes="; 838 for (size_t i = 0; i < kLockLevelCount; ++i) { 839 if (i != kMonitorLock) { 840 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 841 if (mutex != nullptr) { 842 os << " \"" << mutex->GetName() << "\""; 843 if (mutex->IsReaderWriterMutex()) { 844 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 845 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 846 os << "(exclusive held)"; 847 } else { 848 os << "(shared held)"; 849 } 850 } 851 } 852 } 853 } 854 os << "\n"; 855 } 856} 857 858void Thread::DumpState(std::ostream& os) const { 859 Thread::DumpState(os, this, GetTid()); 860} 861 862struct StackDumpVisitor : public StackVisitor { 863 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 864 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 865 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 866 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 867 } 868 869 virtual ~StackDumpVisitor() { 870 if (frame_count == 0) { 871 os << " (no managed stack frames)\n"; 872 } 873 } 874 875 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 876 mirror::ArtMethod* m = GetMethod(); 877 if (m->IsRuntimeMethod()) { 878 return true; 879 } 880 const int kMaxRepetition = 3; 881 mirror::Class* c = m->GetDeclaringClass(); 882 mirror::DexCache* dex_cache = c->GetDexCache(); 883 int line_number = -1; 884 if (dex_cache != nullptr) { // be tolerant of bad input 885 const DexFile& dex_file = *dex_cache->GetDexFile(); 886 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 887 } 888 if (line_number == last_line_number && last_method == m) { 889 ++repetition_count; 890 } else { 891 if (repetition_count >= kMaxRepetition) { 892 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 893 } 894 repetition_count = 0; 895 last_line_number = line_number; 896 last_method = m; 897 } 898 if (repetition_count < kMaxRepetition) { 899 os << " at " << PrettyMethod(m, false); 900 if (m->IsNative()) { 901 os << "(Native method)"; 902 } else { 903 const char* source_file(m->GetDeclaringClassSourceFile()); 904 os << "(" << (source_file != nullptr ? source_file : "unavailable") 905 << ":" << line_number << ")"; 906 } 907 os << "\n"; 908 if (frame_count == 0) { 909 Monitor::DescribeWait(os, thread); 910 } 911 if (can_allocate) { 912 // Visit locks, but do not abort on errors. This would trigger a nested abort. 913 Monitor::VisitLocks(this, DumpLockedObject, &os, false); 914 } 915 } 916 917 ++frame_count; 918 return true; 919 } 920 921 static void DumpLockedObject(mirror::Object* o, void* context) 922 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 923 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 924 os << " - locked "; 925 if (o == nullptr) { 926 os << "an unknown object"; 927 } else { 928 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 929 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 930 // Getting the identity hashcode here would result in lock inflation and suspension of the 931 // current thread, which isn't safe if this is the only runnable thread. 932 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 933 PrettyTypeOf(o).c_str()); 934 } else { 935 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 936 } 937 } 938 os << "\n"; 939 } 940 941 std::ostream& os; 942 const Thread* thread; 943 const bool can_allocate; 944 mirror::ArtMethod* method; 945 mirror::ArtMethod* last_method; 946 int last_line_number; 947 int repetition_count; 948 int frame_count; 949}; 950 951static bool ShouldShowNativeStack(const Thread* thread) 952 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 953 ThreadState state = thread->GetState(); 954 955 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 956 if (state > kWaiting && state < kStarting) { 957 return true; 958 } 959 960 // In an Object.wait variant or Thread.sleep? That's not interesting. 961 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 962 return false; 963 } 964 965 // In some other native method? That's interesting. 966 // We don't just check kNative because native methods will be in state kSuspended if they're 967 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 968 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 969 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 970 return current_method != nullptr && current_method->IsNative(); 971} 972 973void Thread::DumpJavaStack(std::ostream& os) const { 974 std::unique_ptr<Context> context(Context::Create()); 975 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 976 !tls32_.throwing_OutOfMemoryError); 977 dumper.WalkStack(); 978} 979 980void Thread::DumpStack(std::ostream& os) const { 981 // TODO: we call this code when dying but may not have suspended the thread ourself. The 982 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 983 // the race with the thread_suspend_count_lock_). 984 bool dump_for_abort = (gAborting > 0); 985 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 986 if (!kIsDebugBuild) { 987 // We always want to dump the stack for an abort, however, there is no point dumping another 988 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 989 safe_to_dump = (safe_to_dump || dump_for_abort); 990 } 991 if (safe_to_dump) { 992 // If we're currently in native code, dump that stack before dumping the managed stack. 993 if (dump_for_abort || ShouldShowNativeStack(this)) { 994 DumpKernelStack(os, GetTid(), " kernel: ", false); 995 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr)); 996 } 997 DumpJavaStack(os); 998 } else { 999 os << "Not able to dump stack of thread that isn't suspended"; 1000 } 1001} 1002 1003void Thread::ThreadExitCallback(void* arg) { 1004 Thread* self = reinterpret_cast<Thread*>(arg); 1005 if (self->tls32_.thread_exit_check_count == 0) { 1006 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1007 "going to use a pthread_key_create destructor?): " << *self; 1008 CHECK(is_started_); 1009 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1010 self->tls32_.thread_exit_check_count = 1; 1011 } else { 1012 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1013 } 1014} 1015 1016void Thread::Startup() { 1017 CHECK(!is_started_); 1018 is_started_ = true; 1019 { 1020 // MutexLock to keep annotalysis happy. 1021 // 1022 // Note we use nullptr for the thread because Thread::Current can 1023 // return garbage since (is_started_ == true) and 1024 // Thread::pthread_key_self_ is not yet initialized. 1025 // This was seen on glibc. 1026 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1027 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1028 *Locks::thread_suspend_count_lock_); 1029 } 1030 1031 // Allocate a TLS slot. 1032 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1033 1034 // Double-check the TLS slot allocation. 1035 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1036 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1037 } 1038} 1039 1040void Thread::FinishStartup() { 1041 Runtime* runtime = Runtime::Current(); 1042 CHECK(runtime->IsStarted()); 1043 1044 // Finish attaching the main thread. 1045 ScopedObjectAccess soa(Thread::Current()); 1046 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1047 1048 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1049} 1050 1051void Thread::Shutdown() { 1052 CHECK(is_started_); 1053 is_started_ = false; 1054 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1055 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1056 if (resume_cond_ != nullptr) { 1057 delete resume_cond_; 1058 resume_cond_ = nullptr; 1059 } 1060} 1061 1062Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1063 wait_mutex_ = new Mutex("a thread wait mutex"); 1064 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1065 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1066 tlsPtr_.single_step_control = new SingleStepControl; 1067 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1068 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1069 1070 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1071 tls32_.state_and_flags.as_struct.flags = 0; 1072 tls32_.state_and_flags.as_struct.state = kNative; 1073 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1074 std::fill(tlsPtr_.rosalloc_runs, 1075 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1076 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1077 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1078 tlsPtr_.checkpoint_functions[i] = nullptr; 1079 } 1080} 1081 1082bool Thread::IsStillStarting() const { 1083 // You might think you can check whether the state is kStarting, but for much of thread startup, 1084 // the thread is in kNative; it might also be in kVmWait. 1085 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1086 // assigned fairly early on, and needs to be. 1087 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1088 // this thread _ever_ entered kRunnable". 1089 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1090 (*tlsPtr_.name == kThreadNameDuringStartup); 1091} 1092 1093void Thread::AssertNoPendingException() const { 1094 if (UNLIKELY(IsExceptionPending())) { 1095 ScopedObjectAccess soa(Thread::Current()); 1096 mirror::Throwable* exception = GetException(nullptr); 1097 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1098 } 1099} 1100 1101void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1102 if (UNLIKELY(IsExceptionPending())) { 1103 ScopedObjectAccess soa(Thread::Current()); 1104 mirror::Throwable* exception = GetException(nullptr); 1105 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1106 << exception->Dump(); 1107 } 1108} 1109 1110static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1111 RootType /*root_type*/) 1112 NO_THREAD_SAFETY_ANALYSIS { 1113 Thread* self = reinterpret_cast<Thread*>(arg); 1114 mirror::Object* entered_monitor = *object; 1115 if (self->HoldsLock(entered_monitor)) { 1116 LOG(WARNING) << "Calling MonitorExit on object " 1117 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1118 << " left locked by native thread " 1119 << *Thread::Current() << " which is detaching"; 1120 entered_monitor->MonitorExit(self); 1121 } 1122} 1123 1124void Thread::Destroy() { 1125 Thread* self = this; 1126 DCHECK_EQ(self, Thread::Current()); 1127 1128 if (tlsPtr_.opeer != nullptr) { 1129 ScopedObjectAccess soa(self); 1130 // We may need to call user-supplied managed code, do this before final clean-up. 1131 HandleUncaughtExceptions(soa); 1132 RemoveFromThreadGroup(soa); 1133 1134 // this.nativePeer = 0; 1135 if (Runtime::Current()->IsActiveTransaction()) { 1136 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1137 ->SetLong<true>(tlsPtr_.opeer, 0); 1138 } else { 1139 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1140 ->SetLong<false>(tlsPtr_.opeer, 0); 1141 } 1142 Dbg::PostThreadDeath(self); 1143 1144 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1145 // who is waiting. 1146 mirror::Object* lock = 1147 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1148 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1149 if (lock != nullptr) { 1150 StackHandleScope<1> hs(self); 1151 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1152 ObjectLock<mirror::Object> locker(self, h_obj); 1153 locker.NotifyAll(); 1154 } 1155 } 1156 1157 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1158 if (tlsPtr_.jni_env != nullptr) { 1159 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1160 } 1161} 1162 1163Thread::~Thread() { 1164 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1165 // If pthread_create fails we don't have a jni env here. 1166 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1167 tlsPtr_.jpeer = nullptr; 1168 } 1169 tlsPtr_.opeer = nullptr; 1170 1171 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1172 if (initialized) { 1173 delete tlsPtr_.jni_env; 1174 tlsPtr_.jni_env = nullptr; 1175 } 1176 CHECK_NE(GetState(), kRunnable); 1177 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1178 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1179 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1180 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1181 1182 // We may be deleting a still born thread. 1183 SetStateUnsafe(kTerminated); 1184 1185 delete wait_cond_; 1186 delete wait_mutex_; 1187 1188 if (tlsPtr_.long_jump_context != nullptr) { 1189 delete tlsPtr_.long_jump_context; 1190 } 1191 1192 if (initialized) { 1193 CleanupCpu(); 1194 } 1195 1196 delete tlsPtr_.debug_invoke_req; 1197 delete tlsPtr_.single_step_control; 1198 delete tlsPtr_.instrumentation_stack; 1199 delete tlsPtr_.name; 1200 delete tlsPtr_.stack_trace_sample; 1201 1202 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1203 1204 TearDownAlternateSignalStack(); 1205} 1206 1207void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1208 if (!IsExceptionPending()) { 1209 return; 1210 } 1211 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1212 ScopedThreadStateChange tsc(this, kNative); 1213 1214 // Get and clear the exception. 1215 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1216 tlsPtr_.jni_env->ExceptionClear(); 1217 1218 // If the thread has its own handler, use that. 1219 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1220 tlsPtr_.jni_env->GetObjectField(peer.get(), 1221 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1222 if (handler.get() == nullptr) { 1223 // Otherwise use the thread group's default handler. 1224 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1225 WellKnownClasses::java_lang_Thread_group)); 1226 } 1227 1228 // Call the handler. 1229 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1230 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1231 peer.get(), exception.get()); 1232 1233 // If the handler threw, clear that exception too. 1234 tlsPtr_.jni_env->ExceptionClear(); 1235} 1236 1237void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1238 // this.group.removeThread(this); 1239 // group can be null if we're in the compiler or a test. 1240 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1241 ->GetObject(tlsPtr_.opeer); 1242 if (ogroup != nullptr) { 1243 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1244 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1245 ScopedThreadStateChange tsc(soa.Self(), kNative); 1246 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1247 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1248 peer.get()); 1249 } 1250} 1251 1252size_t Thread::NumHandleReferences() { 1253 size_t count = 0; 1254 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1255 count += cur->NumberOfReferences(); 1256 } 1257 return count; 1258} 1259 1260bool Thread::HandleScopeContains(jobject obj) const { 1261 StackReference<mirror::Object>* hs_entry = 1262 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1263 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1264 if (cur->Contains(hs_entry)) { 1265 return true; 1266 } 1267 } 1268 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1269 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1270} 1271 1272void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1273 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1274 size_t num_refs = cur->NumberOfReferences(); 1275 for (size_t j = 0; j < num_refs; ++j) { 1276 mirror::Object* object = cur->GetReference(j); 1277 if (object != nullptr) { 1278 mirror::Object* old_obj = object; 1279 visitor(&object, arg, thread_id, kRootNativeStack); 1280 if (old_obj != object) { 1281 cur->SetReference(j, object); 1282 } 1283 } 1284 } 1285 } 1286} 1287 1288mirror::Object* Thread::DecodeJObject(jobject obj) const { 1289 Locks::mutator_lock_->AssertSharedHeld(this); 1290 if (obj == nullptr) { 1291 return nullptr; 1292 } 1293 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1294 IndirectRefKind kind = GetIndirectRefKind(ref); 1295 mirror::Object* result; 1296 // The "kinds" below are sorted by the frequency we expect to encounter them. 1297 if (kind == kLocal) { 1298 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1299 // Local references do not need a read barrier. 1300 result = locals.Get<kWithoutReadBarrier>(ref); 1301 } else if (kind == kHandleScopeOrInvalid) { 1302 // TODO: make stack indirect reference table lookup more efficient. 1303 // Check if this is a local reference in the handle scope. 1304 if (LIKELY(HandleScopeContains(obj))) { 1305 // Read from handle scope. 1306 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1307 VerifyObject(result); 1308 } else { 1309 result = kInvalidIndirectRefObject; 1310 } 1311 } else if (kind == kGlobal) { 1312 JavaVMExt* const vm = Runtime::Current()->GetJavaVM(); 1313 result = vm->globals.SynchronizedGet(const_cast<Thread*>(this), &vm->globals_lock, ref); 1314 } else { 1315 DCHECK_EQ(kind, kWeakGlobal); 1316 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1317 if (result == kClearedJniWeakGlobal) { 1318 // This is a special case where it's okay to return nullptr. 1319 return nullptr; 1320 } 1321 } 1322 1323 if (UNLIKELY(result == nullptr)) { 1324 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1325 } 1326 return result; 1327} 1328 1329// Implements java.lang.Thread.interrupted. 1330bool Thread::Interrupted() { 1331 MutexLock mu(Thread::Current(), *wait_mutex_); 1332 bool interrupted = IsInterruptedLocked(); 1333 SetInterruptedLocked(false); 1334 return interrupted; 1335} 1336 1337// Implements java.lang.Thread.isInterrupted. 1338bool Thread::IsInterrupted() { 1339 MutexLock mu(Thread::Current(), *wait_mutex_); 1340 return IsInterruptedLocked(); 1341} 1342 1343void Thread::Interrupt(Thread* self) { 1344 MutexLock mu(self, *wait_mutex_); 1345 if (interrupted_) { 1346 return; 1347 } 1348 interrupted_ = true; 1349 NotifyLocked(self); 1350} 1351 1352void Thread::Notify() { 1353 Thread* self = Thread::Current(); 1354 MutexLock mu(self, *wait_mutex_); 1355 NotifyLocked(self); 1356} 1357 1358void Thread::NotifyLocked(Thread* self) { 1359 if (wait_monitor_ != nullptr) { 1360 wait_cond_->Signal(self); 1361 } 1362} 1363 1364class CountStackDepthVisitor : public StackVisitor { 1365 public: 1366 explicit CountStackDepthVisitor(Thread* thread) 1367 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1368 : StackVisitor(thread, nullptr), 1369 depth_(0), skip_depth_(0), skipping_(true) {} 1370 1371 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1372 // We want to skip frames up to and including the exception's constructor. 1373 // Note we also skip the frame if it doesn't have a method (namely the callee 1374 // save frame) 1375 mirror::ArtMethod* m = GetMethod(); 1376 if (skipping_ && !m->IsRuntimeMethod() && 1377 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1378 skipping_ = false; 1379 } 1380 if (!skipping_) { 1381 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1382 ++depth_; 1383 } 1384 } else { 1385 ++skip_depth_; 1386 } 1387 return true; 1388 } 1389 1390 int GetDepth() const { 1391 return depth_; 1392 } 1393 1394 int GetSkipDepth() const { 1395 return skip_depth_; 1396 } 1397 1398 private: 1399 uint32_t depth_; 1400 uint32_t skip_depth_; 1401 bool skipping_; 1402}; 1403 1404template<bool kTransactionActive> 1405class BuildInternalStackTraceVisitor : public StackVisitor { 1406 public: 1407 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1408 : StackVisitor(thread, nullptr), self_(self), 1409 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1410 1411 bool Init(int depth) 1412 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1413 // Allocate method trace with an extra slot that will hold the PC trace 1414 StackHandleScope<1> hs(self_); 1415 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1416 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1417 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1418 if (method_trace.Get() == nullptr) { 1419 return false; 1420 } 1421 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1422 if (dex_pc_trace == nullptr) { 1423 return false; 1424 } 1425 // Save PC trace in last element of method trace, also places it into the 1426 // object graph. 1427 // We are called from native: use non-transactional mode. 1428 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1429 // Set the Object*s and assert that no thread suspension is now possible. 1430 const char* last_no_suspend_cause = 1431 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1432 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1433 method_trace_ = method_trace.Get(); 1434 dex_pc_trace_ = dex_pc_trace; 1435 return true; 1436 } 1437 1438 virtual ~BuildInternalStackTraceVisitor() { 1439 if (method_trace_ != nullptr) { 1440 self_->EndAssertNoThreadSuspension(nullptr); 1441 } 1442 } 1443 1444 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1445 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1446 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1447 } 1448 if (skip_depth_ > 0) { 1449 skip_depth_--; 1450 return true; 1451 } 1452 mirror::ArtMethod* m = GetMethod(); 1453 if (m->IsRuntimeMethod()) { 1454 return true; // Ignore runtime frames (in particular callee save). 1455 } 1456 method_trace_->Set<kTransactionActive>(count_, m); 1457 dex_pc_trace_->Set<kTransactionActive>(count_, 1458 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1459 ++count_; 1460 return true; 1461 } 1462 1463 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1464 return method_trace_; 1465 } 1466 1467 private: 1468 Thread* const self_; 1469 // How many more frames to skip. 1470 int32_t skip_depth_; 1471 // Current position down stack trace. 1472 uint32_t count_; 1473 // Array of dex PC values. 1474 mirror::IntArray* dex_pc_trace_; 1475 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1476 mirror::ObjectArray<mirror::Object>* method_trace_; 1477}; 1478 1479template<bool kTransactionActive> 1480jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1481 // Compute depth of stack 1482 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1483 count_visitor.WalkStack(); 1484 int32_t depth = count_visitor.GetDepth(); 1485 int32_t skip_depth = count_visitor.GetSkipDepth(); 1486 1487 // Build internal stack trace. 1488 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1489 const_cast<Thread*>(this), 1490 skip_depth); 1491 if (!build_trace_visitor.Init(depth)) { 1492 return nullptr; // Allocation failed. 1493 } 1494 build_trace_visitor.WalkStack(); 1495 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1496 if (kIsDebugBuild) { 1497 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1498 CHECK(trace->Get(i) != nullptr); 1499 } 1500 } 1501 return soa.AddLocalReference<jobjectArray>(trace); 1502} 1503template jobject Thread::CreateInternalStackTrace<false>( 1504 const ScopedObjectAccessAlreadyRunnable& soa) const; 1505template jobject Thread::CreateInternalStackTrace<true>( 1506 const ScopedObjectAccessAlreadyRunnable& soa) const; 1507 1508jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1509 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1510 int* stack_depth) { 1511 // Decode the internal stack trace into the depth, method trace and PC trace 1512 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1513 1514 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1515 1516 jobjectArray result; 1517 1518 if (output_array != nullptr) { 1519 // Reuse the array we were given. 1520 result = output_array; 1521 // ...adjusting the number of frames we'll write to not exceed the array length. 1522 const int32_t traces_length = 1523 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1524 depth = std::min(depth, traces_length); 1525 } else { 1526 // Create java_trace array and place in local reference table 1527 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1528 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1529 if (java_traces == nullptr) { 1530 return nullptr; 1531 } 1532 result = soa.AddLocalReference<jobjectArray>(java_traces); 1533 } 1534 1535 if (stack_depth != nullptr) { 1536 *stack_depth = depth; 1537 } 1538 1539 for (int32_t i = 0; i < depth; ++i) { 1540 mirror::ObjectArray<mirror::Object>* method_trace = 1541 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1542 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1543 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1544 int32_t line_number; 1545 StackHandleScope<3> hs(soa.Self()); 1546 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1547 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1548 if (method->IsProxyMethod()) { 1549 line_number = -1; 1550 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1551 // source_name_object intentionally left null for proxy methods 1552 } else { 1553 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1554 uint32_t dex_pc = pc_trace->Get(i); 1555 line_number = method->GetLineNumFromDexPC(dex_pc); 1556 // Allocate element, potentially triggering GC 1557 // TODO: reuse class_name_object via Class::name_? 1558 const char* descriptor = method->GetDeclaringClassDescriptor(); 1559 CHECK(descriptor != nullptr); 1560 std::string class_name(PrettyDescriptor(descriptor)); 1561 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1562 if (class_name_object.Get() == nullptr) { 1563 return nullptr; 1564 } 1565 const char* source_file = method->GetDeclaringClassSourceFile(); 1566 if (source_file != nullptr) { 1567 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1568 if (source_name_object.Get() == nullptr) { 1569 return nullptr; 1570 } 1571 } 1572 } 1573 const char* method_name = method->GetName(); 1574 CHECK(method_name != nullptr); 1575 Handle<mirror::String> method_name_object( 1576 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1577 if (method_name_object.Get() == nullptr) { 1578 return nullptr; 1579 } 1580 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1581 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1582 if (obj == nullptr) { 1583 return nullptr; 1584 } 1585 // We are called from native: use non-transactional mode. 1586 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1587 } 1588 return result; 1589} 1590 1591void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1592 const char* exception_class_descriptor, const char* fmt, ...) { 1593 va_list args; 1594 va_start(args, fmt); 1595 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1596 fmt, args); 1597 va_end(args); 1598} 1599 1600void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1601 const char* exception_class_descriptor, 1602 const char* fmt, va_list ap) { 1603 std::string msg; 1604 StringAppendV(&msg, fmt, ap); 1605 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1606} 1607 1608void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1609 const char* msg) { 1610 // Callers should either clear or call ThrowNewWrappedException. 1611 AssertNoPendingExceptionForNewException(msg); 1612 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1613} 1614 1615void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1616 const char* exception_class_descriptor, 1617 const char* msg) { 1618 DCHECK_EQ(this, Thread::Current()); 1619 ScopedObjectAccessUnchecked soa(this); 1620 StackHandleScope<5> hs(soa.Self()); 1621 // Ensure we don't forget arguments over object allocation. 1622 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1623 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1624 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1625 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1626 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1627 ClearException(); 1628 Runtime* runtime = Runtime::Current(); 1629 1630 mirror::ClassLoader* cl = nullptr; 1631 if (saved_throw_method.Get() != nullptr) { 1632 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1633 } 1634 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1635 Handle<mirror::Class> exception_class( 1636 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1637 class_loader))); 1638 if (UNLIKELY(exception_class.Get() == nullptr)) { 1639 CHECK(IsExceptionPending()); 1640 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1641 return; 1642 } 1643 1644 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1645 DCHECK(IsExceptionPending()); 1646 return; 1647 } 1648 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1649 Handle<mirror::Throwable> exception( 1650 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1651 1652 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1653 if (exception.Get() == nullptr) { 1654 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1655 throw_location.GetDexPc()); 1656 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1657 SetExceptionReportedToInstrumentation(is_exception_reported); 1658 return; 1659 } 1660 1661 // Choose an appropriate constructor and set up the arguments. 1662 const char* signature; 1663 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1664 if (msg != nullptr) { 1665 // Ensure we remember this and the method over the String allocation. 1666 msg_string.reset( 1667 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1668 if (UNLIKELY(msg_string.get() == nullptr)) { 1669 CHECK(IsExceptionPending()); // OOME. 1670 return; 1671 } 1672 if (cause.get() == nullptr) { 1673 signature = "(Ljava/lang/String;)V"; 1674 } else { 1675 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1676 } 1677 } else { 1678 if (cause.get() == nullptr) { 1679 signature = "()V"; 1680 } else { 1681 signature = "(Ljava/lang/Throwable;)V"; 1682 } 1683 } 1684 mirror::ArtMethod* exception_init_method = 1685 exception_class->FindDeclaredDirectMethod("<init>", signature); 1686 1687 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1688 << PrettyDescriptor(exception_class_descriptor); 1689 1690 if (UNLIKELY(!runtime->IsStarted())) { 1691 // Something is trying to throw an exception without a started runtime, which is the common 1692 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1693 // the exception fields directly. 1694 if (msg != nullptr) { 1695 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1696 } 1697 if (cause.get() != nullptr) { 1698 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1699 } 1700 ScopedLocalRef<jobject> trace(GetJniEnv(), 1701 Runtime::Current()->IsActiveTransaction() 1702 ? CreateInternalStackTrace<true>(soa) 1703 : CreateInternalStackTrace<false>(soa)); 1704 if (trace.get() != nullptr) { 1705 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1706 } 1707 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1708 throw_location.GetDexPc()); 1709 SetException(gc_safe_throw_location, exception.Get()); 1710 SetExceptionReportedToInstrumentation(is_exception_reported); 1711 } else { 1712 jvalue jv_args[2]; 1713 size_t i = 0; 1714 1715 if (msg != nullptr) { 1716 jv_args[i].l = msg_string.get(); 1717 ++i; 1718 } 1719 if (cause.get() != nullptr) { 1720 jv_args[i].l = cause.get(); 1721 ++i; 1722 } 1723 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1724 if (LIKELY(!IsExceptionPending())) { 1725 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1726 throw_location.GetDexPc()); 1727 SetException(gc_safe_throw_location, exception.Get()); 1728 SetExceptionReportedToInstrumentation(is_exception_reported); 1729 } 1730 } 1731} 1732 1733void Thread::ThrowOutOfMemoryError(const char* msg) { 1734 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1735 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1736 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1737 if (!tls32_.throwing_OutOfMemoryError) { 1738 tls32_.throwing_OutOfMemoryError = true; 1739 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1740 tls32_.throwing_OutOfMemoryError = false; 1741 } else { 1742 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1743 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1744 } 1745} 1746 1747Thread* Thread::CurrentFromGdb() { 1748 return Thread::Current(); 1749} 1750 1751void Thread::DumpFromGdb() const { 1752 std::ostringstream ss; 1753 Dump(ss); 1754 std::string str(ss.str()); 1755 // log to stderr for debugging command line processes 1756 std::cerr << str; 1757#ifdef HAVE_ANDROID_OS 1758 // log to logcat for debugging frameworks processes 1759 LOG(INFO) << str; 1760#endif 1761} 1762 1763// Explicitly instantiate 32 and 64bit thread offset dumping support. 1764template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1765template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1766 1767template<size_t ptr_size> 1768void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1769#define DO_THREAD_OFFSET(x, y) \ 1770 if (offset == x.Uint32Value()) { \ 1771 os << y; \ 1772 return; \ 1773 } 1774 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1775 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1776 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1777 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1778 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1779 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1780 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1781 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1782 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1783 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1784 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1785 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1786 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1787#undef DO_THREAD_OFFSET 1788 1789#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1790 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1791 os << #x; \ 1792 return; \ 1793 } 1794 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1795 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1796#undef INTERPRETER_ENTRY_POINT_INFO 1797 1798#define JNI_ENTRY_POINT_INFO(x) \ 1799 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1800 os << #x; \ 1801 return; \ 1802 } 1803 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1804#undef JNI_ENTRY_POINT_INFO 1805 1806#define PORTABLE_ENTRY_POINT_INFO(x) \ 1807 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1808 os << #x; \ 1809 return; \ 1810 } 1811 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1812 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1813 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1814#undef PORTABLE_ENTRY_POINT_INFO 1815 1816#define QUICK_ENTRY_POINT_INFO(x) \ 1817 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1818 os << #x; \ 1819 return; \ 1820 } 1821 QUICK_ENTRY_POINT_INFO(pAllocArray) 1822 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1823 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1824 QUICK_ENTRY_POINT_INFO(pAllocObject) 1825 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1826 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1827 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1828 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1829 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1830 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1831 QUICK_ENTRY_POINT_INFO(pCheckCast) 1832 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1833 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1834 QUICK_ENTRY_POINT_INFO(pInitializeType) 1835 QUICK_ENTRY_POINT_INFO(pResolveString) 1836 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1837 QUICK_ENTRY_POINT_INFO(pSet32Static) 1838 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1839 QUICK_ENTRY_POINT_INFO(pSet64Static) 1840 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1841 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1842 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1843 QUICK_ENTRY_POINT_INFO(pGet32Static) 1844 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1845 QUICK_ENTRY_POINT_INFO(pGet64Static) 1846 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1847 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1848 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1849 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1850 QUICK_ENTRY_POINT_INFO(pAputObject) 1851 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1852 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1853 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1854 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1855 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1856 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1857 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1858 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1859 QUICK_ENTRY_POINT_INFO(pLockObject) 1860 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1861 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1862 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1863 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1864 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1865 QUICK_ENTRY_POINT_INFO(pFmod) 1866 QUICK_ENTRY_POINT_INFO(pL2d) 1867 QUICK_ENTRY_POINT_INFO(pFmodf) 1868 QUICK_ENTRY_POINT_INFO(pL2f) 1869 QUICK_ENTRY_POINT_INFO(pD2iz) 1870 QUICK_ENTRY_POINT_INFO(pF2iz) 1871 QUICK_ENTRY_POINT_INFO(pIdivmod) 1872 QUICK_ENTRY_POINT_INFO(pD2l) 1873 QUICK_ENTRY_POINT_INFO(pF2l) 1874 QUICK_ENTRY_POINT_INFO(pLdiv) 1875 QUICK_ENTRY_POINT_INFO(pLmod) 1876 QUICK_ENTRY_POINT_INFO(pLmul) 1877 QUICK_ENTRY_POINT_INFO(pShlLong) 1878 QUICK_ENTRY_POINT_INFO(pShrLong) 1879 QUICK_ENTRY_POINT_INFO(pUshrLong) 1880 QUICK_ENTRY_POINT_INFO(pIndexOf) 1881 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1882 QUICK_ENTRY_POINT_INFO(pMemcpy) 1883 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1884 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1885 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1886 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1887 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1888 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1889 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1890 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1891 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1892 QUICK_ENTRY_POINT_INFO(pDeliverException) 1893 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1894 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1895 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1896 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1897 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1898 QUICK_ENTRY_POINT_INFO(pA64Load) 1899 QUICK_ENTRY_POINT_INFO(pA64Store) 1900#undef QUICK_ENTRY_POINT_INFO 1901 1902 os << offset; 1903} 1904 1905void Thread::QuickDeliverException() { 1906 // Get exception from thread. 1907 ThrowLocation throw_location; 1908 mirror::Throwable* exception = GetException(&throw_location); 1909 CHECK(exception != nullptr); 1910 // Don't leave exception visible while we try to find the handler, which may cause class 1911 // resolution. 1912 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1913 ClearException(); 1914 bool is_deoptimization = (exception == GetDeoptimizationException()); 1915 QuickExceptionHandler exception_handler(this, is_deoptimization); 1916 if (is_deoptimization) { 1917 exception_handler.DeoptimizeStack(); 1918 } else { 1919 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1920 } 1921 exception_handler.UpdateInstrumentationStack(); 1922 exception_handler.DoLongJump(); 1923 LOG(FATAL) << "UNREACHABLE"; 1924} 1925 1926Context* Thread::GetLongJumpContext() { 1927 Context* result = tlsPtr_.long_jump_context; 1928 if (result == nullptr) { 1929 result = Context::Create(); 1930 } else { 1931 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1932 result->Reset(); 1933 } 1934 return result; 1935} 1936 1937// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 1938// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 1939struct CurrentMethodVisitor FINAL : public StackVisitor { 1940 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 1941 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1942 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0), 1943 abort_on_error_(abort_on_error) {} 1944 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1945 mirror::ArtMethod* m = GetMethod(); 1946 if (m->IsRuntimeMethod()) { 1947 // Continue if this is a runtime method. 1948 return true; 1949 } 1950 if (context_ != nullptr) { 1951 this_object_ = GetThisObject(); 1952 } 1953 method_ = m; 1954 dex_pc_ = GetDexPc(abort_on_error_); 1955 return false; 1956 } 1957 mirror::Object* this_object_; 1958 mirror::ArtMethod* method_; 1959 uint32_t dex_pc_; 1960 const bool abort_on_error_; 1961}; 1962 1963mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 1964 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 1965 visitor.WalkStack(false); 1966 if (dex_pc != nullptr) { 1967 *dex_pc = visitor.dex_pc_; 1968 } 1969 return visitor.method_; 1970} 1971 1972ThrowLocation Thread::GetCurrentLocationForThrow() { 1973 Context* context = GetLongJumpContext(); 1974 CurrentMethodVisitor visitor(this, context, true); 1975 visitor.WalkStack(false); 1976 ReleaseLongJumpContext(context); 1977 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1978} 1979 1980bool Thread::HoldsLock(mirror::Object* object) const { 1981 if (object == nullptr) { 1982 return false; 1983 } 1984 return object->GetLockOwnerThreadId() == GetThreadId(); 1985} 1986 1987// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1988template <typename RootVisitor> 1989class ReferenceMapVisitor : public StackVisitor { 1990 public: 1991 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1992 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1993 : StackVisitor(thread, context), visitor_(visitor) {} 1994 1995 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1996 if (false) { 1997 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1998 << StringPrintf("@ PC:%04x", GetDexPc()); 1999 } 2000 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2001 if (shadow_frame != nullptr) { 2002 VisitShadowFrame(shadow_frame); 2003 } else { 2004 VisitQuickFrame(); 2005 } 2006 return true; 2007 } 2008 2009 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2010 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 2011 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 2012 mirror::ArtMethod* m = *method_addr; 2013 DCHECK(m != nullptr); 2014 size_t num_regs = shadow_frame->NumberOfVRegs(); 2015 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2016 // handle scope for JNI or References for interpreter. 2017 for (size_t reg = 0; reg < num_regs; ++reg) { 2018 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2019 if (ref != nullptr) { 2020 mirror::Object* new_ref = ref; 2021 visitor_(&new_ref, reg, this); 2022 if (new_ref != ref) { 2023 shadow_frame->SetVRegReference(reg, new_ref); 2024 } 2025 } 2026 } 2027 } else { 2028 // Java method. 2029 // Portable path use DexGcMap and store in Method.native_gc_map_. 2030 const uint8_t* gc_map = m->GetNativeGcMap(); 2031 CHECK(gc_map != nullptr) << PrettyMethod(m); 2032 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2033 uint32_t dex_pc = shadow_frame->GetDexPC(); 2034 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2035 DCHECK(reg_bitmap != nullptr); 2036 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2037 for (size_t reg = 0; reg < num_regs; ++reg) { 2038 if (TestBitmap(reg, reg_bitmap)) { 2039 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2040 if (ref != nullptr) { 2041 mirror::Object* new_ref = ref; 2042 visitor_(&new_ref, reg, this); 2043 if (new_ref != ref) { 2044 shadow_frame->SetVRegReference(reg, new_ref); 2045 } 2046 } 2047 } 2048 } 2049 } 2050 } 2051 2052 private: 2053 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2054 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2055 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2056 mirror::ArtMethod* old_method = m; 2057 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2058 if (m != old_method) { 2059 cur_quick_frame->Assign(m); 2060 } 2061 2062 // Process register map (which native and runtime methods don't have) 2063 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2064 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2065 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2066 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2067 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2068 NativePcOffsetToReferenceMap map(native_gc_map); 2069 size_t num_regs = std::min(map.RegWidth() * 8, 2070 static_cast<size_t>(code_item->registers_size_)); 2071 if (num_regs > 0) { 2072 Runtime* runtime = Runtime::Current(); 2073 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2074 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2075 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2076 DCHECK(reg_bitmap != nullptr); 2077 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2078 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2079 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2080 // For all dex registers in the bitmap 2081 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2082 DCHECK(cur_quick_frame != nullptr); 2083 for (size_t reg = 0; reg < num_regs; ++reg) { 2084 // Does this register hold a reference? 2085 if (TestBitmap(reg, reg_bitmap)) { 2086 uint32_t vmap_offset; 2087 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2088 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2089 kReferenceVReg); 2090 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2091 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2092 if (*ref_addr != nullptr) { 2093 visitor_(ref_addr, reg, this); 2094 } 2095 } else { 2096 StackReference<mirror::Object>* ref_addr = 2097 reinterpret_cast<StackReference<mirror::Object>*>( 2098 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2099 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2100 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2101 if (ref != nullptr) { 2102 mirror::Object* new_ref = ref; 2103 visitor_(&new_ref, reg, this); 2104 if (ref != new_ref) { 2105 ref_addr->Assign(new_ref); 2106 } 2107 } 2108 } 2109 } 2110 } 2111 } 2112 } 2113 } 2114 2115 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2116 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2117 } 2118 2119 // Visitor for when we visit a root. 2120 const RootVisitor& visitor_; 2121}; 2122 2123class RootCallbackVisitor { 2124 public: 2125 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2126 : callback_(callback), arg_(arg), tid_(tid) {} 2127 2128 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2129 callback_(obj, arg_, tid_, kRootJavaFrame); 2130 } 2131 2132 private: 2133 RootCallback* const callback_; 2134 void* const arg_; 2135 const uint32_t tid_; 2136}; 2137 2138void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2139 VerifyObject(class_loader_override); 2140 tlsPtr_.class_loader_override = class_loader_override; 2141} 2142 2143void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2144 uint32_t thread_id = GetThreadId(); 2145 if (tlsPtr_.opeer != nullptr) { 2146 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2147 } 2148 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2149 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2150 } 2151 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2152 if (tlsPtr_.class_loader_override != nullptr) { 2153 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, thread_id, 2154 kRootNativeStack); 2155 } 2156 if (tlsPtr_.monitor_enter_object != nullptr) { 2157 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2158 } 2159 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2160 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2161 HandleScopeVisitRoots(visitor, arg, thread_id); 2162 if (tlsPtr_.debug_invoke_req != nullptr) { 2163 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2164 } 2165 if (tlsPtr_.single_step_control != nullptr) { 2166 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2167 } 2168 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2169 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2170 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2171 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2172 shadow_frame = shadow_frame->GetLink()) { 2173 mapper.VisitShadowFrame(shadow_frame); 2174 } 2175 } 2176 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2177 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2178 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2179 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2180 shadow_frame != nullptr; 2181 shadow_frame = shadow_frame->GetLink()) { 2182 mapper.VisitShadowFrame(shadow_frame); 2183 } 2184 } 2185 // Visit roots on this thread's stack 2186 Context* context = GetLongJumpContext(); 2187 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2188 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2189 mapper.WalkStack(); 2190 ReleaseLongJumpContext(context); 2191 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2192 if (frame.this_object_ != nullptr) { 2193 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2194 } 2195 DCHECK(frame.method_ != nullptr); 2196 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2197 } 2198} 2199 2200static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2201 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2202 VerifyObject(*root); 2203} 2204 2205void Thread::VerifyStackImpl() { 2206 std::unique_ptr<Context> context(Context::Create()); 2207 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2208 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2209 mapper.WalkStack(); 2210} 2211 2212// Set the stack end to that to be used during a stack overflow 2213void Thread::SetStackEndForStackOverflow() { 2214 // During stack overflow we allow use of the full stack. 2215 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2216 // However, we seem to have already extended to use the full stack. 2217 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2218 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2219 DumpStack(LOG(ERROR)); 2220 LOG(FATAL) << "Recursive stack overflow."; 2221 } 2222 2223 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2224 2225 // Remove the stack overflow protection if is it set up. 2226 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2227 if (implicit_stack_check) { 2228 if (!UnprotectStack()) { 2229 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2230 } 2231 } 2232} 2233 2234void Thread::SetTlab(byte* start, byte* end) { 2235 DCHECK_LE(start, end); 2236 tlsPtr_.thread_local_start = start; 2237 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2238 tlsPtr_.thread_local_end = end; 2239 tlsPtr_.thread_local_objects = 0; 2240} 2241 2242bool Thread::HasTlab() const { 2243 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2244 if (has_tlab) { 2245 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2246 } else { 2247 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2248 } 2249 return has_tlab; 2250} 2251 2252std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2253 thread.ShortDump(os); 2254 return os; 2255} 2256 2257void Thread::ProtectStack() { 2258 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2259 VLOG(threads) << "Protecting stack at " << pregion; 2260 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2261 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2262 "Reason: " 2263 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2264 } 2265} 2266 2267bool Thread::UnprotectStack() { 2268 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2269 VLOG(threads) << "Unprotecting stack at " << pregion; 2270 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2271} 2272 2273 2274} // namespace art 2275