thread.cc revision 03c9785a8a6d712775cf406c4371d0227c44148f
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 } 408 } 409 410 return self; 411} 412 413void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 414 Runtime* runtime = Runtime::Current(); 415 CHECK(runtime->IsStarted()); 416 JNIEnv* env = tlsPtr_.jni_env; 417 418 if (thread_group == nullptr) { 419 thread_group = runtime->GetMainThreadGroup(); 420 } 421 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 422 jint thread_priority = GetNativePriority(); 423 jboolean thread_is_daemon = as_daemon; 424 425 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 426 if (peer.get() == nullptr) { 427 CHECK(IsExceptionPending()); 428 return; 429 } 430 { 431 ScopedObjectAccess soa(this); 432 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 433 } 434 env->CallNonvirtualVoidMethod(peer.get(), 435 WellKnownClasses::java_lang_Thread, 436 WellKnownClasses::java_lang_Thread_init, 437 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 438 AssertNoPendingException(); 439 440 Thread* self = this; 441 DCHECK_EQ(self, Thread::Current()); 442 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 443 reinterpret_cast<jlong>(self)); 444 445 ScopedObjectAccess soa(self); 446 StackHandleScope<1> hs(self); 447 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 448 if (peer_thread_name.Get() == nullptr) { 449 // The Thread constructor should have set the Thread.name to a 450 // non-null value. However, because we can run without code 451 // available (in the compiler, in tests), we manually assign the 452 // fields the constructor should have set. 453 if (runtime->IsActiveTransaction()) { 454 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 455 } else { 456 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 457 } 458 peer_thread_name.Assign(GetThreadName(soa)); 459 } 460 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 461 if (peer_thread_name.Get() != nullptr) { 462 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 463 } 464} 465 466template<bool kTransactionActive> 467void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 468 jobject thread_name, jint thread_priority) { 469 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 470 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 471 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 472 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 473 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 474 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 475 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 476 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 477} 478 479void Thread::SetThreadName(const char* name) { 480 tlsPtr_.name->assign(name); 481 ::art::SetThreadName(name); 482 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 483} 484 485void Thread::InitStackHwm() { 486 void* read_stack_base; 487 size_t read_stack_size; 488 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 489 490 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 491 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 492 PrettySize(read_stack_size).c_str()); 493 494 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 495 tlsPtr_.stack_size = read_stack_size; 496 497 // The minimum stack size we can cope with is the overflow reserved bytes (typically 498 // 8K) + the protected region size (4K) + another page (4K). Typically this will 499 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 500 // between 8K and 12K. 501 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 502 + 4 * KB; 503 if (read_stack_size <= min_stack) { 504 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 505 << " bytes)"; 506 } 507 508 // TODO: move this into the Linux GetThreadStack implementation. 509#if defined(__APPLE__) 510 bool is_main_thread = false; 511#else 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 Monitor::VisitLocks(this, DumpLockedObject, &os); 913 } 914 } 915 916 ++frame_count; 917 return true; 918 } 919 920 static void DumpLockedObject(mirror::Object* o, void* context) 921 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 922 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 923 os << " - locked "; 924 if (o == nullptr) { 925 os << "an unknown object"; 926 } else { 927 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 928 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 929 // Getting the identity hashcode here would result in lock inflation and suspension of the 930 // current thread, which isn't safe if this is the only runnable thread. 931 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 932 PrettyTypeOf(o).c_str()); 933 } else { 934 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 935 } 936 } 937 os << "\n"; 938 } 939 940 std::ostream& os; 941 const Thread* thread; 942 const bool can_allocate; 943 mirror::ArtMethod* method; 944 mirror::ArtMethod* last_method; 945 int last_line_number; 946 int repetition_count; 947 int frame_count; 948}; 949 950static bool ShouldShowNativeStack(const Thread* thread) 951 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 952 ThreadState state = thread->GetState(); 953 954 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 955 if (state > kWaiting && state < kStarting) { 956 return true; 957 } 958 959 // In an Object.wait variant or Thread.sleep? That's not interesting. 960 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 961 return false; 962 } 963 964 // In some other native method? That's interesting. 965 // We don't just check kNative because native methods will be in state kSuspended if they're 966 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 967 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 968 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 969 return current_method != nullptr && current_method->IsNative(); 970} 971 972void Thread::DumpJavaStack(std::ostream& os) const { 973 std::unique_ptr<Context> context(Context::Create()); 974 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 975 !tls32_.throwing_OutOfMemoryError); 976 dumper.WalkStack(); 977} 978 979void Thread::DumpStack(std::ostream& os) const { 980 // TODO: we call this code when dying but may not have suspended the thread ourself. The 981 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 982 // the race with the thread_suspend_count_lock_). 983 bool dump_for_abort = (gAborting > 0); 984 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 985 if (!kIsDebugBuild) { 986 // We always want to dump the stack for an abort, however, there is no point dumping another 987 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 988 safe_to_dump = (safe_to_dump || dump_for_abort); 989 } 990 if (safe_to_dump) { 991 // If we're currently in native code, dump that stack before dumping the managed stack. 992 if (dump_for_abort || ShouldShowNativeStack(this)) { 993 DumpKernelStack(os, GetTid(), " kernel: ", false); 994 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr)); 995 } 996 DumpJavaStack(os); 997 } else { 998 os << "Not able to dump stack of thread that isn't suspended"; 999 } 1000} 1001 1002void Thread::ThreadExitCallback(void* arg) { 1003 Thread* self = reinterpret_cast<Thread*>(arg); 1004 if (self->tls32_.thread_exit_check_count == 0) { 1005 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1006 "going to use a pthread_key_create destructor?): " << *self; 1007 CHECK(is_started_); 1008 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1009 self->tls32_.thread_exit_check_count = 1; 1010 } else { 1011 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1012 } 1013} 1014 1015void Thread::Startup() { 1016 CHECK(!is_started_); 1017 is_started_ = true; 1018 { 1019 // MutexLock to keep annotalysis happy. 1020 // 1021 // Note we use nullptr for the thread because Thread::Current can 1022 // return garbage since (is_started_ == true) and 1023 // Thread::pthread_key_self_ is not yet initialized. 1024 // This was seen on glibc. 1025 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1026 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1027 *Locks::thread_suspend_count_lock_); 1028 } 1029 1030 // Allocate a TLS slot. 1031 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1032 1033 // Double-check the TLS slot allocation. 1034 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1035 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1036 } 1037} 1038 1039void Thread::FinishStartup() { 1040 Runtime* runtime = Runtime::Current(); 1041 CHECK(runtime->IsStarted()); 1042 1043 // Finish attaching the main thread. 1044 ScopedObjectAccess soa(Thread::Current()); 1045 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1046 1047 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1048} 1049 1050void Thread::Shutdown() { 1051 CHECK(is_started_); 1052 is_started_ = false; 1053 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1054 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1055 if (resume_cond_ != nullptr) { 1056 delete resume_cond_; 1057 resume_cond_ = nullptr; 1058 } 1059} 1060 1061Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1062 wait_mutex_ = new Mutex("a thread wait mutex"); 1063 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1064 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1065 tlsPtr_.single_step_control = new SingleStepControl; 1066 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1067 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1068 1069 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1070 tls32_.state_and_flags.as_struct.flags = 0; 1071 tls32_.state_and_flags.as_struct.state = kNative; 1072 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1073 std::fill(tlsPtr_.rosalloc_runs, 1074 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1075 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1076 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1077 tlsPtr_.checkpoint_functions[i] = nullptr; 1078 } 1079} 1080 1081bool Thread::IsStillStarting() const { 1082 // You might think you can check whether the state is kStarting, but for much of thread startup, 1083 // the thread is in kNative; it might also be in kVmWait. 1084 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1085 // assigned fairly early on, and needs to be. 1086 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1087 // this thread _ever_ entered kRunnable". 1088 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1089 (*tlsPtr_.name == kThreadNameDuringStartup); 1090} 1091 1092void Thread::AssertNoPendingException() const { 1093 if (UNLIKELY(IsExceptionPending())) { 1094 ScopedObjectAccess soa(Thread::Current()); 1095 mirror::Throwable* exception = GetException(nullptr); 1096 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1097 } 1098} 1099 1100void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1101 if (UNLIKELY(IsExceptionPending())) { 1102 ScopedObjectAccess soa(Thread::Current()); 1103 mirror::Throwable* exception = GetException(nullptr); 1104 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1105 << exception->Dump(); 1106 } 1107} 1108 1109static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1110 RootType /*root_type*/) 1111 NO_THREAD_SAFETY_ANALYSIS { 1112 Thread* self = reinterpret_cast<Thread*>(arg); 1113 mirror::Object* entered_monitor = *object; 1114 if (self->HoldsLock(entered_monitor)) { 1115 LOG(WARNING) << "Calling MonitorExit on object " 1116 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1117 << " left locked by native thread " 1118 << *Thread::Current() << " which is detaching"; 1119 entered_monitor->MonitorExit(self); 1120 } 1121} 1122 1123void Thread::Destroy() { 1124 Thread* self = this; 1125 DCHECK_EQ(self, Thread::Current()); 1126 1127 if (tlsPtr_.opeer != nullptr) { 1128 ScopedObjectAccess soa(self); 1129 // We may need to call user-supplied managed code, do this before final clean-up. 1130 HandleUncaughtExceptions(soa); 1131 RemoveFromThreadGroup(soa); 1132 1133 // this.nativePeer = 0; 1134 if (Runtime::Current()->IsActiveTransaction()) { 1135 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1136 ->SetLong<true>(tlsPtr_.opeer, 0); 1137 } else { 1138 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1139 ->SetLong<false>(tlsPtr_.opeer, 0); 1140 } 1141 Dbg::PostThreadDeath(self); 1142 1143 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1144 // who is waiting. 1145 mirror::Object* lock = 1146 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1147 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1148 if (lock != nullptr) { 1149 StackHandleScope<1> hs(self); 1150 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1151 ObjectLock<mirror::Object> locker(self, h_obj); 1152 locker.NotifyAll(); 1153 } 1154 } 1155 1156 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1157 if (tlsPtr_.jni_env != nullptr) { 1158 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1159 } 1160} 1161 1162Thread::~Thread() { 1163 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1164 // If pthread_create fails we don't have a jni env here. 1165 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1166 tlsPtr_.jpeer = nullptr; 1167 } 1168 tlsPtr_.opeer = nullptr; 1169 1170 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1171 if (initialized) { 1172 delete tlsPtr_.jni_env; 1173 tlsPtr_.jni_env = nullptr; 1174 } 1175 CHECK_NE(GetState(), kRunnable); 1176 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1177 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1178 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1179 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1180 1181 // We may be deleting a still born thread. 1182 SetStateUnsafe(kTerminated); 1183 1184 delete wait_cond_; 1185 delete wait_mutex_; 1186 1187 if (tlsPtr_.long_jump_context != nullptr) { 1188 delete tlsPtr_.long_jump_context; 1189 } 1190 1191 if (initialized) { 1192 CleanupCpu(); 1193 } 1194 1195 delete tlsPtr_.debug_invoke_req; 1196 delete tlsPtr_.single_step_control; 1197 delete tlsPtr_.instrumentation_stack; 1198 delete tlsPtr_.name; 1199 delete tlsPtr_.stack_trace_sample; 1200 1201 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1202 1203 TearDownAlternateSignalStack(); 1204} 1205 1206void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1207 if (!IsExceptionPending()) { 1208 return; 1209 } 1210 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1211 ScopedThreadStateChange tsc(this, kNative); 1212 1213 // Get and clear the exception. 1214 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1215 tlsPtr_.jni_env->ExceptionClear(); 1216 1217 // If the thread has its own handler, use that. 1218 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1219 tlsPtr_.jni_env->GetObjectField(peer.get(), 1220 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1221 if (handler.get() == nullptr) { 1222 // Otherwise use the thread group's default handler. 1223 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1224 WellKnownClasses::java_lang_Thread_group)); 1225 } 1226 1227 // Call the handler. 1228 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1229 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1230 peer.get(), exception.get()); 1231 1232 // If the handler threw, clear that exception too. 1233 tlsPtr_.jni_env->ExceptionClear(); 1234} 1235 1236void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1237 // this.group.removeThread(this); 1238 // group can be null if we're in the compiler or a test. 1239 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1240 ->GetObject(tlsPtr_.opeer); 1241 if (ogroup != nullptr) { 1242 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1243 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1244 ScopedThreadStateChange tsc(soa.Self(), kNative); 1245 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1246 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1247 peer.get()); 1248 } 1249} 1250 1251size_t Thread::NumHandleReferences() { 1252 size_t count = 0; 1253 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1254 count += cur->NumberOfReferences(); 1255 } 1256 return count; 1257} 1258 1259bool Thread::HandleScopeContains(jobject obj) const { 1260 StackReference<mirror::Object>* hs_entry = 1261 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1262 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1263 if (cur->Contains(hs_entry)) { 1264 return true; 1265 } 1266 } 1267 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1268 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1269} 1270 1271void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1272 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1273 size_t num_refs = cur->NumberOfReferences(); 1274 for (size_t j = 0; j < num_refs; ++j) { 1275 mirror::Object* object = cur->GetReference(j); 1276 if (object != nullptr) { 1277 mirror::Object* old_obj = object; 1278 visitor(&object, arg, thread_id, kRootNativeStack); 1279 if (old_obj != object) { 1280 cur->SetReference(j, object); 1281 } 1282 } 1283 } 1284 } 1285} 1286 1287mirror::Object* Thread::DecodeJObject(jobject obj) const { 1288 Locks::mutator_lock_->AssertSharedHeld(this); 1289 if (obj == nullptr) { 1290 return nullptr; 1291 } 1292 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1293 IndirectRefKind kind = GetIndirectRefKind(ref); 1294 mirror::Object* result; 1295 // The "kinds" below are sorted by the frequency we expect to encounter them. 1296 if (kind == kLocal) { 1297 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1298 // Local references do not need a read barrier. 1299 result = locals.Get<kWithoutReadBarrier>(ref); 1300 } else if (kind == kHandleScopeOrInvalid) { 1301 // TODO: make stack indirect reference table lookup more efficient. 1302 // Check if this is a local reference in the handle scope. 1303 if (LIKELY(HandleScopeContains(obj))) { 1304 // Read from handle scope. 1305 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1306 VerifyObject(result); 1307 } else { 1308 result = kInvalidIndirectRefObject; 1309 } 1310 } else if (kind == kGlobal) { 1311 JavaVMExt* const vm = Runtime::Current()->GetJavaVM(); 1312 result = vm->globals.SynchronizedGet(const_cast<Thread*>(this), &vm->globals_lock, ref); 1313 } else { 1314 DCHECK_EQ(kind, kWeakGlobal); 1315 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1316 if (result == kClearedJniWeakGlobal) { 1317 // This is a special case where it's okay to return nullptr. 1318 return nullptr; 1319 } 1320 } 1321 1322 if (UNLIKELY(result == nullptr)) { 1323 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1324 } 1325 return result; 1326} 1327 1328// Implements java.lang.Thread.interrupted. 1329bool Thread::Interrupted() { 1330 MutexLock mu(Thread::Current(), *wait_mutex_); 1331 bool interrupted = IsInterruptedLocked(); 1332 SetInterruptedLocked(false); 1333 return interrupted; 1334} 1335 1336// Implements java.lang.Thread.isInterrupted. 1337bool Thread::IsInterrupted() { 1338 MutexLock mu(Thread::Current(), *wait_mutex_); 1339 return IsInterruptedLocked(); 1340} 1341 1342void Thread::Interrupt(Thread* self) { 1343 MutexLock mu(self, *wait_mutex_); 1344 if (interrupted_) { 1345 return; 1346 } 1347 interrupted_ = true; 1348 NotifyLocked(self); 1349} 1350 1351void Thread::Notify() { 1352 Thread* self = Thread::Current(); 1353 MutexLock mu(self, *wait_mutex_); 1354 NotifyLocked(self); 1355} 1356 1357void Thread::NotifyLocked(Thread* self) { 1358 if (wait_monitor_ != nullptr) { 1359 wait_cond_->Signal(self); 1360 } 1361} 1362 1363class CountStackDepthVisitor : public StackVisitor { 1364 public: 1365 explicit CountStackDepthVisitor(Thread* thread) 1366 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1367 : StackVisitor(thread, nullptr), 1368 depth_(0), skip_depth_(0), skipping_(true) {} 1369 1370 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1371 // We want to skip frames up to and including the exception's constructor. 1372 // Note we also skip the frame if it doesn't have a method (namely the callee 1373 // save frame) 1374 mirror::ArtMethod* m = GetMethod(); 1375 if (skipping_ && !m->IsRuntimeMethod() && 1376 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1377 skipping_ = false; 1378 } 1379 if (!skipping_) { 1380 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1381 ++depth_; 1382 } 1383 } else { 1384 ++skip_depth_; 1385 } 1386 return true; 1387 } 1388 1389 int GetDepth() const { 1390 return depth_; 1391 } 1392 1393 int GetSkipDepth() const { 1394 return skip_depth_; 1395 } 1396 1397 private: 1398 uint32_t depth_; 1399 uint32_t skip_depth_; 1400 bool skipping_; 1401}; 1402 1403template<bool kTransactionActive> 1404class BuildInternalStackTraceVisitor : public StackVisitor { 1405 public: 1406 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1407 : StackVisitor(thread, nullptr), self_(self), 1408 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1409 1410 bool Init(int depth) 1411 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1412 // Allocate method trace with an extra slot that will hold the PC trace 1413 StackHandleScope<1> hs(self_); 1414 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1415 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1416 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1417 if (method_trace.Get() == nullptr) { 1418 return false; 1419 } 1420 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1421 if (dex_pc_trace == nullptr) { 1422 return false; 1423 } 1424 // Save PC trace in last element of method trace, also places it into the 1425 // object graph. 1426 // We are called from native: use non-transactional mode. 1427 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1428 // Set the Object*s and assert that no thread suspension is now possible. 1429 const char* last_no_suspend_cause = 1430 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1431 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1432 method_trace_ = method_trace.Get(); 1433 dex_pc_trace_ = dex_pc_trace; 1434 return true; 1435 } 1436 1437 virtual ~BuildInternalStackTraceVisitor() { 1438 if (method_trace_ != nullptr) { 1439 self_->EndAssertNoThreadSuspension(nullptr); 1440 } 1441 } 1442 1443 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1444 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1445 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1446 } 1447 if (skip_depth_ > 0) { 1448 skip_depth_--; 1449 return true; 1450 } 1451 mirror::ArtMethod* m = GetMethod(); 1452 if (m->IsRuntimeMethod()) { 1453 return true; // Ignore runtime frames (in particular callee save). 1454 } 1455 method_trace_->Set<kTransactionActive>(count_, m); 1456 dex_pc_trace_->Set<kTransactionActive>(count_, 1457 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1458 ++count_; 1459 return true; 1460 } 1461 1462 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1463 return method_trace_; 1464 } 1465 1466 private: 1467 Thread* const self_; 1468 // How many more frames to skip. 1469 int32_t skip_depth_; 1470 // Current position down stack trace. 1471 uint32_t count_; 1472 // Array of dex PC values. 1473 mirror::IntArray* dex_pc_trace_; 1474 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1475 mirror::ObjectArray<mirror::Object>* method_trace_; 1476}; 1477 1478template<bool kTransactionActive> 1479jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1480 // Compute depth of stack 1481 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1482 count_visitor.WalkStack(); 1483 int32_t depth = count_visitor.GetDepth(); 1484 int32_t skip_depth = count_visitor.GetSkipDepth(); 1485 1486 // Build internal stack trace. 1487 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1488 const_cast<Thread*>(this), 1489 skip_depth); 1490 if (!build_trace_visitor.Init(depth)) { 1491 return nullptr; // Allocation failed. 1492 } 1493 build_trace_visitor.WalkStack(); 1494 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1495 if (kIsDebugBuild) { 1496 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1497 CHECK(trace->Get(i) != nullptr); 1498 } 1499 } 1500 return soa.AddLocalReference<jobjectArray>(trace); 1501} 1502template jobject Thread::CreateInternalStackTrace<false>( 1503 const ScopedObjectAccessAlreadyRunnable& soa) const; 1504template jobject Thread::CreateInternalStackTrace<true>( 1505 const ScopedObjectAccessAlreadyRunnable& soa) const; 1506 1507jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1508 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1509 int* stack_depth) { 1510 // Decode the internal stack trace into the depth, method trace and PC trace 1511 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1512 1513 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1514 1515 jobjectArray result; 1516 1517 if (output_array != nullptr) { 1518 // Reuse the array we were given. 1519 result = output_array; 1520 // ...adjusting the number of frames we'll write to not exceed the array length. 1521 const int32_t traces_length = 1522 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1523 depth = std::min(depth, traces_length); 1524 } else { 1525 // Create java_trace array and place in local reference table 1526 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1527 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1528 if (java_traces == nullptr) { 1529 return nullptr; 1530 } 1531 result = soa.AddLocalReference<jobjectArray>(java_traces); 1532 } 1533 1534 if (stack_depth != nullptr) { 1535 *stack_depth = depth; 1536 } 1537 1538 for (int32_t i = 0; i < depth; ++i) { 1539 mirror::ObjectArray<mirror::Object>* method_trace = 1540 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1541 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1542 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1543 int32_t line_number; 1544 StackHandleScope<3> hs(soa.Self()); 1545 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1546 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1547 if (method->IsProxyMethod()) { 1548 line_number = -1; 1549 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1550 // source_name_object intentionally left null for proxy methods 1551 } else { 1552 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1553 uint32_t dex_pc = pc_trace->Get(i); 1554 line_number = method->GetLineNumFromDexPC(dex_pc); 1555 // Allocate element, potentially triggering GC 1556 // TODO: reuse class_name_object via Class::name_? 1557 const char* descriptor = method->GetDeclaringClassDescriptor(); 1558 CHECK(descriptor != nullptr); 1559 std::string class_name(PrettyDescriptor(descriptor)); 1560 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1561 if (class_name_object.Get() == nullptr) { 1562 return nullptr; 1563 } 1564 const char* source_file = method->GetDeclaringClassSourceFile(); 1565 if (source_file != nullptr) { 1566 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1567 if (source_name_object.Get() == nullptr) { 1568 return nullptr; 1569 } 1570 } 1571 } 1572 const char* method_name = method->GetName(); 1573 CHECK(method_name != nullptr); 1574 Handle<mirror::String> method_name_object( 1575 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1576 if (method_name_object.Get() == nullptr) { 1577 return nullptr; 1578 } 1579 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1580 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1581 if (obj == nullptr) { 1582 return nullptr; 1583 } 1584 // We are called from native: use non-transactional mode. 1585 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1586 } 1587 return result; 1588} 1589 1590void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1591 const char* exception_class_descriptor, const char* fmt, ...) { 1592 va_list args; 1593 va_start(args, fmt); 1594 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1595 fmt, args); 1596 va_end(args); 1597} 1598 1599void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1600 const char* exception_class_descriptor, 1601 const char* fmt, va_list ap) { 1602 std::string msg; 1603 StringAppendV(&msg, fmt, ap); 1604 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1605} 1606 1607void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1608 const char* msg) { 1609 // Callers should either clear or call ThrowNewWrappedException. 1610 AssertNoPendingExceptionForNewException(msg); 1611 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1612} 1613 1614void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1615 const char* exception_class_descriptor, 1616 const char* msg) { 1617 DCHECK_EQ(this, Thread::Current()); 1618 ScopedObjectAccessUnchecked soa(this); 1619 StackHandleScope<5> hs(soa.Self()); 1620 // Ensure we don't forget arguments over object allocation. 1621 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1622 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1623 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1624 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1625 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1626 ClearException(); 1627 Runtime* runtime = Runtime::Current(); 1628 1629 mirror::ClassLoader* cl = nullptr; 1630 if (saved_throw_method.Get() != nullptr) { 1631 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1632 } 1633 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1634 Handle<mirror::Class> exception_class( 1635 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1636 class_loader))); 1637 if (UNLIKELY(exception_class.Get() == nullptr)) { 1638 CHECK(IsExceptionPending()); 1639 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1640 return; 1641 } 1642 1643 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1644 DCHECK(IsExceptionPending()); 1645 return; 1646 } 1647 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1648 Handle<mirror::Throwable> exception( 1649 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1650 1651 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1652 if (exception.Get() == nullptr) { 1653 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1654 throw_location.GetDexPc()); 1655 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1656 SetExceptionReportedToInstrumentation(is_exception_reported); 1657 return; 1658 } 1659 1660 // Choose an appropriate constructor and set up the arguments. 1661 const char* signature; 1662 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1663 if (msg != nullptr) { 1664 // Ensure we remember this and the method over the String allocation. 1665 msg_string.reset( 1666 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1667 if (UNLIKELY(msg_string.get() == nullptr)) { 1668 CHECK(IsExceptionPending()); // OOME. 1669 return; 1670 } 1671 if (cause.get() == nullptr) { 1672 signature = "(Ljava/lang/String;)V"; 1673 } else { 1674 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1675 } 1676 } else { 1677 if (cause.get() == nullptr) { 1678 signature = "()V"; 1679 } else { 1680 signature = "(Ljava/lang/Throwable;)V"; 1681 } 1682 } 1683 mirror::ArtMethod* exception_init_method = 1684 exception_class->FindDeclaredDirectMethod("<init>", signature); 1685 1686 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1687 << PrettyDescriptor(exception_class_descriptor); 1688 1689 if (UNLIKELY(!runtime->IsStarted())) { 1690 // Something is trying to throw an exception without a started runtime, which is the common 1691 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1692 // the exception fields directly. 1693 if (msg != nullptr) { 1694 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1695 } 1696 if (cause.get() != nullptr) { 1697 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1698 } 1699 ScopedLocalRef<jobject> trace(GetJniEnv(), 1700 Runtime::Current()->IsActiveTransaction() 1701 ? CreateInternalStackTrace<true>(soa) 1702 : CreateInternalStackTrace<false>(soa)); 1703 if (trace.get() != nullptr) { 1704 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1705 } 1706 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1707 throw_location.GetDexPc()); 1708 SetException(gc_safe_throw_location, exception.Get()); 1709 SetExceptionReportedToInstrumentation(is_exception_reported); 1710 } else { 1711 jvalue jv_args[2]; 1712 size_t i = 0; 1713 1714 if (msg != nullptr) { 1715 jv_args[i].l = msg_string.get(); 1716 ++i; 1717 } 1718 if (cause.get() != nullptr) { 1719 jv_args[i].l = cause.get(); 1720 ++i; 1721 } 1722 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1723 if (LIKELY(!IsExceptionPending())) { 1724 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1725 throw_location.GetDexPc()); 1726 SetException(gc_safe_throw_location, exception.Get()); 1727 SetExceptionReportedToInstrumentation(is_exception_reported); 1728 } 1729 } 1730} 1731 1732void Thread::ThrowOutOfMemoryError(const char* msg) { 1733 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1734 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1735 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1736 if (!tls32_.throwing_OutOfMemoryError) { 1737 tls32_.throwing_OutOfMemoryError = true; 1738 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1739 tls32_.throwing_OutOfMemoryError = false; 1740 } else { 1741 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1742 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1743 } 1744} 1745 1746Thread* Thread::CurrentFromGdb() { 1747 return Thread::Current(); 1748} 1749 1750void Thread::DumpFromGdb() const { 1751 std::ostringstream ss; 1752 Dump(ss); 1753 std::string str(ss.str()); 1754 // log to stderr for debugging command line processes 1755 std::cerr << str; 1756#ifdef HAVE_ANDROID_OS 1757 // log to logcat for debugging frameworks processes 1758 LOG(INFO) << str; 1759#endif 1760} 1761 1762// Explicitly instantiate 32 and 64bit thread offset dumping support. 1763template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1764template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1765 1766template<size_t ptr_size> 1767void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1768#define DO_THREAD_OFFSET(x, y) \ 1769 if (offset == x.Uint32Value()) { \ 1770 os << y; \ 1771 return; \ 1772 } 1773 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1774 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1775 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1776 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1777 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1778 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1779 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1780 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1781 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1782 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1783 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1784 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1785 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1786#undef DO_THREAD_OFFSET 1787 1788#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1789 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1790 os << #x; \ 1791 return; \ 1792 } 1793 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1794 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1795#undef INTERPRETER_ENTRY_POINT_INFO 1796 1797#define JNI_ENTRY_POINT_INFO(x) \ 1798 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1799 os << #x; \ 1800 return; \ 1801 } 1802 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1803#undef JNI_ENTRY_POINT_INFO 1804 1805#define PORTABLE_ENTRY_POINT_INFO(x) \ 1806 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1807 os << #x; \ 1808 return; \ 1809 } 1810 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1811 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1812 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1813#undef PORTABLE_ENTRY_POINT_INFO 1814 1815#define QUICK_ENTRY_POINT_INFO(x) \ 1816 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1817 os << #x; \ 1818 return; \ 1819 } 1820 QUICK_ENTRY_POINT_INFO(pAllocArray) 1821 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1822 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1823 QUICK_ENTRY_POINT_INFO(pAllocObject) 1824 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1825 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1826 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1827 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1828 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1829 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1830 QUICK_ENTRY_POINT_INFO(pCheckCast) 1831 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1832 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1833 QUICK_ENTRY_POINT_INFO(pInitializeType) 1834 QUICK_ENTRY_POINT_INFO(pResolveString) 1835 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1836 QUICK_ENTRY_POINT_INFO(pSet32Static) 1837 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1838 QUICK_ENTRY_POINT_INFO(pSet64Static) 1839 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1840 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1841 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1842 QUICK_ENTRY_POINT_INFO(pGet32Static) 1843 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1844 QUICK_ENTRY_POINT_INFO(pGet64Static) 1845 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1846 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1847 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1848 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1849 QUICK_ENTRY_POINT_INFO(pAputObject) 1850 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1851 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1852 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1853 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1854 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1855 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1856 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1857 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1858 QUICK_ENTRY_POINT_INFO(pLockObject) 1859 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1860 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1861 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1862 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1863 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1864 QUICK_ENTRY_POINT_INFO(pFmod) 1865 QUICK_ENTRY_POINT_INFO(pL2d) 1866 QUICK_ENTRY_POINT_INFO(pFmodf) 1867 QUICK_ENTRY_POINT_INFO(pL2f) 1868 QUICK_ENTRY_POINT_INFO(pD2iz) 1869 QUICK_ENTRY_POINT_INFO(pF2iz) 1870 QUICK_ENTRY_POINT_INFO(pIdivmod) 1871 QUICK_ENTRY_POINT_INFO(pD2l) 1872 QUICK_ENTRY_POINT_INFO(pF2l) 1873 QUICK_ENTRY_POINT_INFO(pLdiv) 1874 QUICK_ENTRY_POINT_INFO(pLmod) 1875 QUICK_ENTRY_POINT_INFO(pLmul) 1876 QUICK_ENTRY_POINT_INFO(pShlLong) 1877 QUICK_ENTRY_POINT_INFO(pShrLong) 1878 QUICK_ENTRY_POINT_INFO(pUshrLong) 1879 QUICK_ENTRY_POINT_INFO(pIndexOf) 1880 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1881 QUICK_ENTRY_POINT_INFO(pMemcpy) 1882 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1883 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1884 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1885 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1886 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1887 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1888 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1889 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1890 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1891 QUICK_ENTRY_POINT_INFO(pDeliverException) 1892 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1893 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1894 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1895 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1896 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1897 QUICK_ENTRY_POINT_INFO(pA64Load) 1898 QUICK_ENTRY_POINT_INFO(pA64Store) 1899#undef QUICK_ENTRY_POINT_INFO 1900 1901 os << offset; 1902} 1903 1904void Thread::QuickDeliverException() { 1905 // Get exception from thread. 1906 ThrowLocation throw_location; 1907 mirror::Throwable* exception = GetException(&throw_location); 1908 CHECK(exception != nullptr); 1909 // Don't leave exception visible while we try to find the handler, which may cause class 1910 // resolution. 1911 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1912 ClearException(); 1913 bool is_deoptimization = (exception == GetDeoptimizationException()); 1914 QuickExceptionHandler exception_handler(this, is_deoptimization); 1915 if (is_deoptimization) { 1916 exception_handler.DeoptimizeStack(); 1917 } else { 1918 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1919 } 1920 exception_handler.UpdateInstrumentationStack(); 1921 exception_handler.DoLongJump(); 1922 LOG(FATAL) << "UNREACHABLE"; 1923} 1924 1925Context* Thread::GetLongJumpContext() { 1926 Context* result = tlsPtr_.long_jump_context; 1927 if (result == nullptr) { 1928 result = Context::Create(); 1929 } else { 1930 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1931 result->Reset(); 1932 } 1933 return result; 1934} 1935 1936// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 1937// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 1938struct CurrentMethodVisitor FINAL : public StackVisitor { 1939 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 1940 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1941 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0), 1942 abort_on_error_(abort_on_error) {} 1943 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1944 mirror::ArtMethod* m = GetMethod(); 1945 if (m->IsRuntimeMethod()) { 1946 // Continue if this is a runtime method. 1947 return true; 1948 } 1949 if (context_ != nullptr) { 1950 this_object_ = GetThisObject(); 1951 } 1952 method_ = m; 1953 dex_pc_ = GetDexPc(abort_on_error_); 1954 return false; 1955 } 1956 mirror::Object* this_object_; 1957 mirror::ArtMethod* method_; 1958 uint32_t dex_pc_; 1959 const bool abort_on_error_; 1960}; 1961 1962mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 1963 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 1964 visitor.WalkStack(false); 1965 if (dex_pc != nullptr) { 1966 *dex_pc = visitor.dex_pc_; 1967 } 1968 return visitor.method_; 1969} 1970 1971ThrowLocation Thread::GetCurrentLocationForThrow() { 1972 Context* context = GetLongJumpContext(); 1973 CurrentMethodVisitor visitor(this, context, true); 1974 visitor.WalkStack(false); 1975 ReleaseLongJumpContext(context); 1976 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1977} 1978 1979bool Thread::HoldsLock(mirror::Object* object) const { 1980 if (object == nullptr) { 1981 return false; 1982 } 1983 return object->GetLockOwnerThreadId() == GetThreadId(); 1984} 1985 1986// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1987template <typename RootVisitor> 1988class ReferenceMapVisitor : public StackVisitor { 1989 public: 1990 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1991 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1992 : StackVisitor(thread, context), visitor_(visitor) {} 1993 1994 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1995 if (false) { 1996 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1997 << StringPrintf("@ PC:%04x", GetDexPc()); 1998 } 1999 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2000 if (shadow_frame != nullptr) { 2001 VisitShadowFrame(shadow_frame); 2002 } else { 2003 VisitQuickFrame(); 2004 } 2005 return true; 2006 } 2007 2008 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2009 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 2010 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 2011 mirror::ArtMethod* m = *method_addr; 2012 DCHECK(m != nullptr); 2013 size_t num_regs = shadow_frame->NumberOfVRegs(); 2014 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2015 // handle scope for JNI or References for interpreter. 2016 for (size_t reg = 0; reg < num_regs; ++reg) { 2017 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2018 if (ref != nullptr) { 2019 mirror::Object* new_ref = ref; 2020 visitor_(&new_ref, reg, this); 2021 if (new_ref != ref) { 2022 shadow_frame->SetVRegReference(reg, new_ref); 2023 } 2024 } 2025 } 2026 } else { 2027 // Java method. 2028 // Portable path use DexGcMap and store in Method.native_gc_map_. 2029 const uint8_t* gc_map = m->GetNativeGcMap(); 2030 CHECK(gc_map != nullptr) << PrettyMethod(m); 2031 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2032 uint32_t dex_pc = shadow_frame->GetDexPC(); 2033 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2034 DCHECK(reg_bitmap != nullptr); 2035 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2036 for (size_t reg = 0; reg < num_regs; ++reg) { 2037 if (TestBitmap(reg, reg_bitmap)) { 2038 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2039 if (ref != nullptr) { 2040 mirror::Object* new_ref = ref; 2041 visitor_(&new_ref, reg, this); 2042 if (new_ref != ref) { 2043 shadow_frame->SetVRegReference(reg, new_ref); 2044 } 2045 } 2046 } 2047 } 2048 } 2049 } 2050 2051 private: 2052 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2053 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2054 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2055 mirror::ArtMethod* old_method = m; 2056 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2057 if (m != old_method) { 2058 cur_quick_frame->Assign(m); 2059 } 2060 2061 // Process register map (which native and runtime methods don't have) 2062 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2063 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2064 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2065 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2066 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2067 NativePcOffsetToReferenceMap map(native_gc_map); 2068 size_t num_regs = std::min(map.RegWidth() * 8, 2069 static_cast<size_t>(code_item->registers_size_)); 2070 if (num_regs > 0) { 2071 Runtime* runtime = Runtime::Current(); 2072 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2073 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2074 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2075 DCHECK(reg_bitmap != nullptr); 2076 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2077 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2078 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2079 // For all dex registers in the bitmap 2080 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2081 DCHECK(cur_quick_frame != nullptr); 2082 for (size_t reg = 0; reg < num_regs; ++reg) { 2083 // Does this register hold a reference? 2084 if (TestBitmap(reg, reg_bitmap)) { 2085 uint32_t vmap_offset; 2086 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2087 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2088 kReferenceVReg); 2089 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2090 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2091 if (*ref_addr != nullptr) { 2092 visitor_(ref_addr, reg, this); 2093 } 2094 } else { 2095 StackReference<mirror::Object>* ref_addr = 2096 reinterpret_cast<StackReference<mirror::Object>*>( 2097 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2098 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2099 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2100 if (ref != nullptr) { 2101 mirror::Object* new_ref = ref; 2102 visitor_(&new_ref, reg, this); 2103 if (ref != new_ref) { 2104 ref_addr->Assign(new_ref); 2105 } 2106 } 2107 } 2108 } 2109 } 2110 } 2111 } 2112 } 2113 2114 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2115 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2116 } 2117 2118 // Visitor for when we visit a root. 2119 const RootVisitor& visitor_; 2120}; 2121 2122class RootCallbackVisitor { 2123 public: 2124 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2125 : callback_(callback), arg_(arg), tid_(tid) {} 2126 2127 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2128 callback_(obj, arg_, tid_, kRootJavaFrame); 2129 } 2130 2131 private: 2132 RootCallback* const callback_; 2133 void* const arg_; 2134 const uint32_t tid_; 2135}; 2136 2137void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2138 VerifyObject(class_loader_override); 2139 tlsPtr_.class_loader_override = class_loader_override; 2140} 2141 2142void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2143 uint32_t thread_id = GetThreadId(); 2144 if (tlsPtr_.opeer != nullptr) { 2145 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2146 } 2147 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2148 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2149 } 2150 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2151 if (tlsPtr_.class_loader_override != nullptr) { 2152 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, thread_id, 2153 kRootNativeStack); 2154 } 2155 if (tlsPtr_.monitor_enter_object != nullptr) { 2156 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2157 } 2158 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2159 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2160 HandleScopeVisitRoots(visitor, arg, thread_id); 2161 if (tlsPtr_.debug_invoke_req != nullptr) { 2162 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2163 } 2164 if (tlsPtr_.single_step_control != nullptr) { 2165 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2166 } 2167 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2168 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2169 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2170 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2171 shadow_frame = shadow_frame->GetLink()) { 2172 mapper.VisitShadowFrame(shadow_frame); 2173 } 2174 } 2175 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2176 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2177 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2178 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2179 shadow_frame != nullptr; 2180 shadow_frame = shadow_frame->GetLink()) { 2181 mapper.VisitShadowFrame(shadow_frame); 2182 } 2183 } 2184 // Visit roots on this thread's stack 2185 Context* context = GetLongJumpContext(); 2186 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2187 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2188 mapper.WalkStack(); 2189 ReleaseLongJumpContext(context); 2190 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2191 if (frame.this_object_ != nullptr) { 2192 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2193 } 2194 DCHECK(frame.method_ != nullptr); 2195 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2196 } 2197} 2198 2199static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2200 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2201 VerifyObject(*root); 2202} 2203 2204void Thread::VerifyStackImpl() { 2205 std::unique_ptr<Context> context(Context::Create()); 2206 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2207 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2208 mapper.WalkStack(); 2209} 2210 2211// Set the stack end to that to be used during a stack overflow 2212void Thread::SetStackEndForStackOverflow() { 2213 // During stack overflow we allow use of the full stack. 2214 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2215 // However, we seem to have already extended to use the full stack. 2216 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2217 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2218 DumpStack(LOG(ERROR)); 2219 LOG(FATAL) << "Recursive stack overflow."; 2220 } 2221 2222 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2223 2224 // Remove the stack overflow protection if is it set up. 2225 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2226 if (implicit_stack_check) { 2227 if (!UnprotectStack()) { 2228 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2229 } 2230 } 2231} 2232 2233void Thread::SetTlab(byte* start, byte* end) { 2234 DCHECK_LE(start, end); 2235 tlsPtr_.thread_local_start = start; 2236 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2237 tlsPtr_.thread_local_end = end; 2238 tlsPtr_.thread_local_objects = 0; 2239} 2240 2241bool Thread::HasTlab() const { 2242 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2243 if (has_tlab) { 2244 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2245 } else { 2246 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2247 } 2248 return has_tlab; 2249} 2250 2251std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2252 thread.ShortDump(os); 2253 return os; 2254} 2255 2256void Thread::ProtectStack() { 2257 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2258 VLOG(threads) << "Protecting stack at " << pregion; 2259 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2260 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2261 "Reason: " 2262 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2263 } 2264} 2265 2266bool Thread::UnprotectStack() { 2267 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2268 VLOG(threads) << "Unprotecting stack at " << pregion; 2269 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2270} 2271 2272 2273} // namespace art 2274