thread.cc revision 4cf00ba324f5f6884059796a6ba41937f32e1844
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 = kStackOverflowProtectedSize + 80 GetStackOverflowReservedBytes(kRuntimeISA); 81 82static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 83 84void Thread::InitCardTable() { 85 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 86} 87 88static void UnimplementedEntryPoint() { 89 UNIMPLEMENTED(FATAL); 90} 91 92void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 93 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 94 95void Thread::InitTlsEntryPoints() { 96 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 97 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 98 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + 99 sizeof(tlsPtr_.quick_entrypoints)); 100 for (uintptr_t* it = begin; it != end; ++it) { 101 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 102 } 103 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 104 &tlsPtr_.portable_entrypoints, &tlsPtr_.quick_entrypoints); 105} 106 107void Thread::ResetQuickAllocEntryPointsForThread() { 108 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 109} 110 111void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 112 tlsPtr_.deoptimization_shadow_frame = sf; 113} 114 115void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 116 tls64_.deoptimization_return_value.SetJ(ret_val.GetJ()); 117} 118 119ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 120 ShadowFrame* sf = tlsPtr_.deoptimization_shadow_frame; 121 tlsPtr_.deoptimization_shadow_frame = nullptr; 122 ret_val->SetJ(tls64_.deoptimization_return_value.GetJ()); 123 return sf; 124} 125 126void Thread::SetShadowFrameUnderConstruction(ShadowFrame* sf) { 127 sf->SetLink(tlsPtr_.shadow_frame_under_construction); 128 tlsPtr_.shadow_frame_under_construction = sf; 129} 130 131void Thread::ClearShadowFrameUnderConstruction() { 132 CHECK_NE(static_cast<ShadowFrame*>(nullptr), tlsPtr_.shadow_frame_under_construction); 133 tlsPtr_.shadow_frame_under_construction = tlsPtr_.shadow_frame_under_construction->GetLink(); 134} 135 136void Thread::InitTid() { 137 tls32_.tid = ::art::GetTid(); 138} 139 140void Thread::InitAfterFork() { 141 // One thread (us) survived the fork, but we have a new tid so we need to 142 // update the value stashed in this Thread*. 143 InitTid(); 144} 145 146void* Thread::CreateCallback(void* arg) { 147 Thread* self = reinterpret_cast<Thread*>(arg); 148 Runtime* runtime = Runtime::Current(); 149 if (runtime == nullptr) { 150 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 151 return nullptr; 152 } 153 { 154 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 155 // after self->Init(). 156 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 157 // Check that if we got here we cannot be shutting down (as shutdown should never have started 158 // while threads are being born). 159 CHECK(!runtime->IsShuttingDownLocked()); 160 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 161 Runtime::Current()->EndThreadBirth(); 162 } 163 { 164 ScopedObjectAccess soa(self); 165 166 // Copy peer into self, deleting global reference when done. 167 CHECK(self->tlsPtr_.jpeer != nullptr); 168 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 169 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 170 self->tlsPtr_.jpeer = nullptr; 171 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 172 Dbg::PostThreadStart(self); 173 174 // Invoke the 'run' method of our java.lang.Thread. 175 mirror::Object* receiver = self->tlsPtr_.opeer; 176 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 177 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 178 } 179 // Detach and delete self. 180 Runtime::Current()->GetThreadList()->Unregister(self); 181 182 return nullptr; 183} 184 185Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 186 mirror::Object* thread_peer) { 187 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 188 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 189 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 190 // to stop it from going away. 191 if (kIsDebugBuild) { 192 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 193 if (result != nullptr && !result->IsSuspended()) { 194 Locks::thread_list_lock_->AssertHeld(soa.Self()); 195 } 196 } 197 return result; 198} 199 200Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 201 jobject java_thread) { 202 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 203} 204 205static size_t FixStackSize(size_t stack_size) { 206 // A stack size of zero means "use the default". 207 if (stack_size == 0) { 208 stack_size = Runtime::Current()->GetDefaultStackSize(); 209 } 210 211 // Dalvik used the bionic pthread default stack size for native threads, 212 // so include that here to support apps that expect large native stacks. 213 stack_size += 1 * MB; 214 215 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 216 if (stack_size < PTHREAD_STACK_MIN) { 217 stack_size = PTHREAD_STACK_MIN; 218 } 219 220 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 221 // It's likely that callers are trying to ensure they have at least a certain amount of 222 // stack space, so we should add our reserved space on top of what they requested, rather 223 // than implicitly take it away from them. 224 stack_size += GetStackOverflowReservedBytes(kRuntimeISA); 225 } else { 226 // If we are going to use implicit stack checks, allocate space for the protected 227 // region at the bottom of the stack. 228 stack_size += Thread::kStackOverflowImplicitCheckSize; 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_end_. Just below that 242// is the StackOverflow reserved region used when creating the StackOverflow 243// exception. 244// 245// There is a little complexity here that deserves a special mention. When running on the 246// host (glibc), the process's main thread's stack is allocated with a special flag 247// to prevent memory being allocated when it's not needed. This flag makes the 248// kernel only allocate memory for the stack by growing down in memory. Because we 249// want to put an mprotected region far away from that at the stack top, we need 250// to make sure the pages for the stack are mapped in before we call mprotect. We do 251// this by reading every page from the stack bottom (highest address) to the stack top. 252// We then madvise this away. 253void Thread::InstallImplicitProtection(bool is_main_stack) { 254 byte* pregion = tlsPtr_.stack_end; 255 byte* stack_lowmem = tlsPtr_.stack_begin; 256 byte* stack_top = reinterpret_cast<byte*>(reinterpret_cast<uintptr_t>(&pregion) & 257 ~(kPageSize - 1)); // Page containing current top of stack. 258 259 const bool running_on_intel = (kRuntimeISA == kX86) || (kRuntimeISA == kX86_64); 260 261 if (running_on_intel) { 262 // On Intel, we need to map in the main stack. This must be done by reading from the 263 // current stack pointer downwards as the stack is mapped using VM_GROWSDOWN 264 // in the kernel. Any access more than a page below the current SP will cause 265 // a segv. 266 if (is_main_stack) { 267 // First we need to unprotect the protected region because this may 268 // be called more than once for a particular stack and we will crash 269 // if we try to read the protected page. 270 mprotect(pregion - kStackOverflowProtectedSize, kStackOverflowProtectedSize, PROT_READ); 271 272 // Read every page from the high address to the low. 273 for (byte* p = stack_top; p > stack_lowmem; p -= kPageSize) { 274 dont_optimize_this = *p; 275 } 276 } 277 } 278 279 // Check and place a marker word at the lowest usable address in the stack. This 280 // is used to prevent a double protection. 281 constexpr uint32_t kMarker = 0xdadadada; 282 uintptr_t *marker = reinterpret_cast<uintptr_t*>(pregion); 283 if (*marker == kMarker) { 284 // The region has already been set up. But on the main stack on the host we have 285 // removed the protected region in order to read the stack memory. We need to put 286 // this back again. 287 if (is_main_stack && running_on_intel) { 288 mprotect(pregion - kStackOverflowProtectedSize, kStackOverflowProtectedSize, PROT_NONE); 289 madvise(stack_lowmem, stack_top - stack_lowmem, MADV_DONTNEED); 290 } 291 return; 292 } 293 // Add marker so that we can detect a second attempt to do this. 294 *marker = kMarker; 295 296 if (!running_on_intel) { 297 // Running on !Intel, stacks are mapped cleanly. The protected region for the 298 // main stack just needs to be mapped in. We do this by writing one byte per page. 299 for (byte* p = pregion - kStackOverflowProtectedSize; p < pregion; p += kPageSize) { 300 *p = 0; 301 } 302 } 303 304 pregion -= kStackOverflowProtectedSize; 305 306 VLOG(threads) << "installing stack protected region at " << std::hex << 307 static_cast<void*>(pregion) << " to " << 308 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 309 310 311 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 312 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. Reason:" 313 << strerror(errno) << kStackOverflowProtectedSize; 314 } 315 316 // Tell the kernel that we won't be needing these pages any more. 317 // NB. madvise will probably write zeroes into the memory (on linux it does). 318 if (is_main_stack) { 319 if (running_on_intel) { 320 // On the host, it's the whole stack (minus a page to prevent overwrite of stack top). 321 madvise(stack_lowmem, stack_top - stack_lowmem - kPageSize, MADV_DONTNEED); 322 } else { 323 // On Android, just the protected region. 324 madvise(pregion, kStackOverflowProtectedSize, MADV_DONTNEED); 325 } 326 } 327} 328 329void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 330 CHECK(java_peer != nullptr); 331 Thread* self = static_cast<JNIEnvExt*>(env)->self; 332 Runtime* runtime = Runtime::Current(); 333 334 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 335 bool thread_start_during_shutdown = false; 336 { 337 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 338 if (runtime->IsShuttingDownLocked()) { 339 thread_start_during_shutdown = true; 340 } else { 341 runtime->StartThreadBirth(); 342 } 343 } 344 if (thread_start_during_shutdown) { 345 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 346 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 347 return; 348 } 349 350 Thread* child_thread = new Thread(is_daemon); 351 // Use global JNI ref to hold peer live while child thread starts. 352 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 353 stack_size = FixStackSize(stack_size); 354 355 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 356 // assign it. 357 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 358 reinterpret_cast<jlong>(child_thread)); 359 360 pthread_t new_pthread; 361 pthread_attr_t attr; 362 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 363 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 364 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 365 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 366 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 367 368 if (pthread_create_result != 0) { 369 // pthread_create(3) failed, so clean up. 370 { 371 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 372 runtime->EndThreadBirth(); 373 } 374 // Manually delete the global reference since Thread::Init will not have been run. 375 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 376 child_thread->tlsPtr_.jpeer = nullptr; 377 delete child_thread; 378 child_thread = nullptr; 379 // TODO: remove from thread group? 380 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 381 { 382 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 383 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 384 ScopedObjectAccess soa(env); 385 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 386 } 387 } 388} 389 390void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 391 // This function does all the initialization that must be run by the native thread it applies to. 392 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 393 // we can handshake with the corresponding native thread when it's ready.) Check this native 394 // thread hasn't been through here already... 395 CHECK(Thread::Current() == nullptr); 396 SetUpAlternateSignalStack(); 397 InitCpu(); 398 InitTlsEntryPoints(); 399 RemoveSuspendTrigger(); 400 InitCardTable(); 401 InitTid(); 402 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 403 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 404 tlsPtr_.pthread_self = pthread_self(); 405 CHECK(is_started_); 406 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 407 DCHECK_EQ(Thread::Current(), this); 408 409 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 410 InitStackHwm(); 411 412 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 413 thread_list->Register(this); 414} 415 416Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 417 bool create_peer) { 418 Thread* self; 419 Runtime* runtime = Runtime::Current(); 420 if (runtime == nullptr) { 421 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 422 return nullptr; 423 } 424 { 425 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 426 if (runtime->IsShuttingDownLocked()) { 427 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 428 return nullptr; 429 } else { 430 Runtime::Current()->StartThreadBirth(); 431 self = new Thread(as_daemon); 432 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 433 Runtime::Current()->EndThreadBirth(); 434 } 435 } 436 437 CHECK_NE(self->GetState(), kRunnable); 438 self->SetState(kNative); 439 440 // If we're the main thread, ClassLinker won't be created until after we're attached, 441 // so that thread needs a two-stage attach. Regular threads don't need this hack. 442 // In the compiler, all threads need this hack, because no-one's going to be getting 443 // a native peer! 444 if (create_peer) { 445 self->CreatePeer(thread_name, as_daemon, thread_group); 446 } else { 447 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 448 if (thread_name != nullptr) { 449 self->tlsPtr_.name->assign(thread_name); 450 ::art::SetThreadName(thread_name); 451 } 452 } 453 454 return self; 455} 456 457void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 458 Runtime* runtime = Runtime::Current(); 459 CHECK(runtime->IsStarted()); 460 JNIEnv* env = tlsPtr_.jni_env; 461 462 if (thread_group == nullptr) { 463 thread_group = runtime->GetMainThreadGroup(); 464 } 465 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 466 jint thread_priority = GetNativePriority(); 467 jboolean thread_is_daemon = as_daemon; 468 469 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 470 if (peer.get() == nullptr) { 471 CHECK(IsExceptionPending()); 472 return; 473 } 474 { 475 ScopedObjectAccess soa(this); 476 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 477 } 478 env->CallNonvirtualVoidMethod(peer.get(), 479 WellKnownClasses::java_lang_Thread, 480 WellKnownClasses::java_lang_Thread_init, 481 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 482 AssertNoPendingException(); 483 484 Thread* self = this; 485 DCHECK_EQ(self, Thread::Current()); 486 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 487 reinterpret_cast<jlong>(self)); 488 489 ScopedObjectAccess soa(self); 490 StackHandleScope<1> hs(self); 491 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 492 if (peer_thread_name.Get() == nullptr) { 493 // The Thread constructor should have set the Thread.name to a 494 // non-null value. However, because we can run without code 495 // available (in the compiler, in tests), we manually assign the 496 // fields the constructor should have set. 497 if (runtime->IsActiveTransaction()) { 498 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 499 } else { 500 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 501 } 502 peer_thread_name.Assign(GetThreadName(soa)); 503 } 504 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 505 if (peer_thread_name.Get() != nullptr) { 506 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 507 } 508} 509 510template<bool kTransactionActive> 511void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 512 jobject thread_name, jint thread_priority) { 513 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 514 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 515 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 516 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 517 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 518 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 519 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 520 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 521} 522 523void Thread::SetThreadName(const char* name) { 524 tlsPtr_.name->assign(name); 525 ::art::SetThreadName(name); 526 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 527} 528 529void Thread::InitStackHwm() { 530 void* read_stack_base; 531 size_t read_stack_size; 532 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 533 534 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 535 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 536 PrettySize(read_stack_size).c_str()); 537 538 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 539 tlsPtr_.stack_size = read_stack_size; 540 541 if (read_stack_size <= GetStackOverflowReservedBytes(kRuntimeISA)) { 542 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 543 << " bytes)"; 544 } 545 546 // TODO: move this into the Linux GetThreadStack implementation. 547#if !defined(__APPLE__) 548 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 549 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 550 // will be broken because we'll die long before we get close to 2GB. 551 bool is_main_thread = (::art::GetTid() == getpid()); 552 if (is_main_thread) { 553 rlimit stack_limit; 554 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 555 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 556 } 557 if (stack_limit.rlim_cur == RLIM_INFINITY) { 558 // Find the default stack size for new threads... 559 pthread_attr_t default_attributes; 560 size_t default_stack_size; 561 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 562 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 563 "default stack size query"); 564 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 565 566 // ...and use that as our limit. 567 size_t old_stack_size = read_stack_size; 568 tlsPtr_.stack_size = default_stack_size; 569 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 570 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 571 << " to " << PrettySize(default_stack_size) 572 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 573 } 574 } 575#endif 576 577 // Set stack_end_ to the bottom of the stack saving space of stack overflows 578 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 579 ResetDefaultStackEnd(implicit_stack_check); 580 581 // Install the protected region if we are doing implicit overflow checks. 582 if (implicit_stack_check) { 583 if (is_main_thread) { 584 size_t guardsize; 585 pthread_attr_t attributes; 586 CHECK_PTHREAD_CALL(pthread_attr_init, (&attributes), "guard size query"); 587 CHECK_PTHREAD_CALL(pthread_attr_getguardsize, (&attributes, &guardsize), "guard size query"); 588 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attributes), "guard size query"); 589 // The main thread might have protected region at the bottom. We need 590 // to install our own region so we need to move the limits 591 // of the stack to make room for it. 592 tlsPtr_.stack_begin += guardsize; 593 tlsPtr_.stack_end += guardsize; 594 tlsPtr_.stack_size -= guardsize; 595 } 596 InstallImplicitProtection(is_main_thread); 597 } 598 599 // Sanity check. 600 int stack_variable; 601 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 602} 603 604void Thread::ShortDump(std::ostream& os) const { 605 os << "Thread["; 606 if (GetThreadId() != 0) { 607 // If we're in kStarting, we won't have a thin lock id or tid yet. 608 os << GetThreadId() 609 << ",tid=" << GetTid() << ','; 610 } 611 os << GetState() 612 << ",Thread*=" << this 613 << ",peer=" << tlsPtr_.opeer 614 << ",\"" << *tlsPtr_.name << "\"" 615 << "]"; 616} 617 618void Thread::Dump(std::ostream& os) const { 619 DumpState(os); 620 DumpStack(os); 621} 622 623mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 624 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 625 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 626} 627 628void Thread::GetThreadName(std::string& name) const { 629 name.assign(*tlsPtr_.name); 630} 631 632uint64_t Thread::GetCpuMicroTime() const { 633#if defined(HAVE_POSIX_CLOCKS) 634 clockid_t cpu_clock_id; 635 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 636 timespec now; 637 clock_gettime(cpu_clock_id, &now); 638 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 639#else 640 UNIMPLEMENTED(WARNING); 641 return -1; 642#endif 643} 644 645// Attempt to rectify locks so that we dump thread list with required locks before exiting. 646static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 647 LOG(ERROR) << *thread << " suspend count already zero."; 648 Locks::thread_suspend_count_lock_->Unlock(self); 649 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 650 Locks::mutator_lock_->SharedTryLock(self); 651 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 652 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 653 } 654 } 655 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 656 Locks::thread_list_lock_->TryLock(self); 657 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 658 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 659 } 660 } 661 std::ostringstream ss; 662 Runtime::Current()->GetThreadList()->DumpLocked(ss); 663 LOG(FATAL) << ss.str(); 664} 665 666void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 667 if (kIsDebugBuild) { 668 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 669 << delta << " " << tls32_.debug_suspend_count << " " << this; 670 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 671 Locks::thread_suspend_count_lock_->AssertHeld(self); 672 if (this != self && !IsSuspended()) { 673 Locks::thread_list_lock_->AssertHeld(self); 674 } 675 } 676 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 677 UnsafeLogFatalForSuspendCount(self, this); 678 return; 679 } 680 681 tls32_.suspend_count += delta; 682 if (for_debugger) { 683 tls32_.debug_suspend_count += delta; 684 } 685 686 if (tls32_.suspend_count == 0) { 687 AtomicClearFlag(kSuspendRequest); 688 } else { 689 AtomicSetFlag(kSuspendRequest); 690 TriggerSuspend(); 691 } 692} 693 694void Thread::RunCheckpointFunction() { 695 Closure *checkpoints[kMaxCheckpoints]; 696 697 // Grab the suspend_count lock and copy the current set of 698 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 699 // function will also grab this lock so we prevent a race between setting 700 // the kCheckpointRequest flag and clearing it. 701 { 702 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 703 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 704 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 705 tlsPtr_.checkpoint_functions[i] = nullptr; 706 } 707 AtomicClearFlag(kCheckpointRequest); 708 } 709 710 // Outside the lock, run all the checkpoint functions that 711 // we collected. 712 bool found_checkpoint = false; 713 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 714 if (checkpoints[i] != nullptr) { 715 ATRACE_BEGIN("Checkpoint function"); 716 checkpoints[i]->Run(this); 717 ATRACE_END(); 718 found_checkpoint = true; 719 } 720 } 721 CHECK(found_checkpoint); 722} 723 724bool Thread::RequestCheckpoint(Closure* function) { 725 union StateAndFlags old_state_and_flags; 726 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 727 if (old_state_and_flags.as_struct.state != kRunnable) { 728 return false; // Fail, thread is suspended and so can't run a checkpoint. 729 } 730 731 uint32_t available_checkpoint = kMaxCheckpoints; 732 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 733 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 734 available_checkpoint = i; 735 break; 736 } 737 } 738 if (available_checkpoint == kMaxCheckpoints) { 739 // No checkpoint functions available, we can't run a checkpoint 740 return false; 741 } 742 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 743 744 // Checkpoint function installed now install flag bit. 745 // We must be runnable to request a checkpoint. 746 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 747 union StateAndFlags new_state_and_flags; 748 new_state_and_flags.as_int = old_state_and_flags.as_int; 749 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 750 bool success = 751 tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent(old_state_and_flags.as_int, 752 new_state_and_flags.as_int); 753 if (UNLIKELY(!success)) { 754 // The thread changed state before the checkpoint was installed. 755 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 756 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 757 } else { 758 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 759 TriggerSuspend(); 760 } 761 return success; 762} 763 764void Thread::FullSuspendCheck() { 765 VLOG(threads) << this << " self-suspending"; 766 ATRACE_BEGIN("Full suspend check"); 767 // Make thread appear suspended to other threads, release mutator_lock_. 768 TransitionFromRunnableToSuspended(kSuspended); 769 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 770 TransitionFromSuspendedToRunnable(); 771 ATRACE_END(); 772 VLOG(threads) << this << " self-reviving"; 773} 774 775void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 776 std::string group_name; 777 int priority; 778 bool is_daemon = false; 779 Thread* self = Thread::Current(); 780 781 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 782 // cause ScopedObjectAccessUnchecked to deadlock. 783 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 784 ScopedObjectAccessUnchecked soa(self); 785 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 786 ->GetInt(thread->tlsPtr_.opeer); 787 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 788 ->GetBoolean(thread->tlsPtr_.opeer); 789 790 mirror::Object* thread_group = 791 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 792 793 if (thread_group != nullptr) { 794 mirror::ArtField* group_name_field = 795 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 796 mirror::String* group_name_string = 797 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 798 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 799 } 800 } else { 801 priority = GetNativePriority(); 802 } 803 804 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 805 if (scheduler_group_name.empty()) { 806 scheduler_group_name = "default"; 807 } 808 809 if (thread != nullptr) { 810 os << '"' << *thread->tlsPtr_.name << '"'; 811 if (is_daemon) { 812 os << " daemon"; 813 } 814 os << " prio=" << priority 815 << " tid=" << thread->GetThreadId() 816 << " " << thread->GetState(); 817 if (thread->IsStillStarting()) { 818 os << " (still starting up)"; 819 } 820 os << "\n"; 821 } else { 822 os << '"' << ::art::GetThreadName(tid) << '"' 823 << " prio=" << priority 824 << " (not attached)\n"; 825 } 826 827 if (thread != nullptr) { 828 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 829 os << " | group=\"" << group_name << "\"" 830 << " sCount=" << thread->tls32_.suspend_count 831 << " dsCount=" << thread->tls32_.debug_suspend_count 832 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 833 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 834 } 835 836 os << " | sysTid=" << tid 837 << " nice=" << getpriority(PRIO_PROCESS, tid) 838 << " cgrp=" << scheduler_group_name; 839 if (thread != nullptr) { 840 int policy; 841 sched_param sp; 842 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 843 __FUNCTION__); 844 os << " sched=" << policy << "/" << sp.sched_priority 845 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 846 } 847 os << "\n"; 848 849 // Grab the scheduler stats for this thread. 850 std::string scheduler_stats; 851 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 852 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 853 } else { 854 scheduler_stats = "0 0 0"; 855 } 856 857 char native_thread_state = '?'; 858 int utime = 0; 859 int stime = 0; 860 int task_cpu = 0; 861 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 862 863 os << " | state=" << native_thread_state 864 << " schedstat=( " << scheduler_stats << " )" 865 << " utm=" << utime 866 << " stm=" << stime 867 << " core=" << task_cpu 868 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 869 if (thread != nullptr) { 870 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 871 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 872 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 873 // Dump the held mutexes. 874 os << " | held mutexes="; 875 for (size_t i = 0; i < kLockLevelCount; ++i) { 876 if (i != kMonitorLock) { 877 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 878 if (mutex != nullptr) { 879 os << " \"" << mutex->GetName() << "\""; 880 if (mutex->IsReaderWriterMutex()) { 881 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 882 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 883 os << "(exclusive held)"; 884 } else { 885 os << "(shared held)"; 886 } 887 } 888 } 889 } 890 } 891 os << "\n"; 892 } 893} 894 895void Thread::DumpState(std::ostream& os) const { 896 Thread::DumpState(os, this, GetTid()); 897} 898 899struct StackDumpVisitor : public StackVisitor { 900 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 901 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 902 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 903 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 904 } 905 906 virtual ~StackDumpVisitor() { 907 if (frame_count == 0) { 908 os << " (no managed stack frames)\n"; 909 } 910 } 911 912 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 913 mirror::ArtMethod* m = GetMethod(); 914 if (m->IsRuntimeMethod()) { 915 return true; 916 } 917 const int kMaxRepetition = 3; 918 mirror::Class* c = m->GetDeclaringClass(); 919 mirror::DexCache* dex_cache = c->GetDexCache(); 920 int line_number = -1; 921 if (dex_cache != nullptr) { // be tolerant of bad input 922 const DexFile& dex_file = *dex_cache->GetDexFile(); 923 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 924 } 925 if (line_number == last_line_number && last_method == m) { 926 ++repetition_count; 927 } else { 928 if (repetition_count >= kMaxRepetition) { 929 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 930 } 931 repetition_count = 0; 932 last_line_number = line_number; 933 last_method = m; 934 } 935 if (repetition_count < kMaxRepetition) { 936 os << " at " << PrettyMethod(m, false); 937 if (m->IsNative()) { 938 os << "(Native method)"; 939 } else { 940 const char* source_file(m->GetDeclaringClassSourceFile()); 941 os << "(" << (source_file != nullptr ? source_file : "unavailable") 942 << ":" << line_number << ")"; 943 } 944 os << "\n"; 945 if (frame_count == 0) { 946 Monitor::DescribeWait(os, thread); 947 } 948 if (can_allocate) { 949 Monitor::VisitLocks(this, DumpLockedObject, &os); 950 } 951 } 952 953 ++frame_count; 954 return true; 955 } 956 957 static void DumpLockedObject(mirror::Object* o, void* context) 958 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 959 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 960 os << " - locked "; 961 if (o == nullptr) { 962 os << "an unknown object"; 963 } else { 964 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 965 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 966 // Getting the identity hashcode here would result in lock inflation and suspension of the 967 // current thread, which isn't safe if this is the only runnable thread. 968 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 969 PrettyTypeOf(o).c_str()); 970 } else { 971 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 972 } 973 } 974 os << "\n"; 975 } 976 977 std::ostream& os; 978 const Thread* thread; 979 const bool can_allocate; 980 mirror::ArtMethod* method; 981 mirror::ArtMethod* last_method; 982 int last_line_number; 983 int repetition_count; 984 int frame_count; 985}; 986 987static bool ShouldShowNativeStack(const Thread* thread) 988 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 989 ThreadState state = thread->GetState(); 990 991 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 992 if (state > kWaiting && state < kStarting) { 993 return true; 994 } 995 996 // In an Object.wait variant or Thread.sleep? That's not interesting. 997 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 998 return false; 999 } 1000 1001 // In some other native method? That's interesting. 1002 // We don't just check kNative because native methods will be in state kSuspended if they're 1003 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 1004 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 1005 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 1006 return current_method != nullptr && current_method->IsNative(); 1007} 1008 1009void Thread::DumpJavaStack(std::ostream& os) const { 1010 std::unique_ptr<Context> context(Context::Create()); 1011 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 1012 !tls32_.throwing_OutOfMemoryError); 1013 dumper.WalkStack(); 1014} 1015 1016void Thread::DumpStack(std::ostream& os) const { 1017 // TODO: we call this code when dying but may not have suspended the thread ourself. The 1018 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 1019 // the race with the thread_suspend_count_lock_). 1020 bool dump_for_abort = (gAborting > 0); 1021 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 1022 if (!kIsDebugBuild) { 1023 // We always want to dump the stack for an abort, however, there is no point dumping another 1024 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 1025 safe_to_dump = (safe_to_dump || dump_for_abort); 1026 } 1027 if (safe_to_dump) { 1028 // If we're currently in native code, dump that stack before dumping the managed stack. 1029 if (dump_for_abort || ShouldShowNativeStack(this)) { 1030 DumpKernelStack(os, GetTid(), " kernel: ", false); 1031 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr)); 1032 } 1033 DumpJavaStack(os); 1034 } else { 1035 os << "Not able to dump stack of thread that isn't suspended"; 1036 } 1037} 1038 1039void Thread::ThreadExitCallback(void* arg) { 1040 Thread* self = reinterpret_cast<Thread*>(arg); 1041 if (self->tls32_.thread_exit_check_count == 0) { 1042 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1043 "going to use a pthread_key_create destructor?): " << *self; 1044 CHECK(is_started_); 1045 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1046 self->tls32_.thread_exit_check_count = 1; 1047 } else { 1048 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1049 } 1050} 1051 1052void Thread::Startup() { 1053 CHECK(!is_started_); 1054 is_started_ = true; 1055 { 1056 // MutexLock to keep annotalysis happy. 1057 // 1058 // Note we use nullptr for the thread because Thread::Current can 1059 // return garbage since (is_started_ == true) and 1060 // Thread::pthread_key_self_ is not yet initialized. 1061 // This was seen on glibc. 1062 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1063 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1064 *Locks::thread_suspend_count_lock_); 1065 } 1066 1067 // Allocate a TLS slot. 1068 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1069 1070 // Double-check the TLS slot allocation. 1071 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1072 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1073 } 1074} 1075 1076void Thread::FinishStartup() { 1077 Runtime* runtime = Runtime::Current(); 1078 CHECK(runtime->IsStarted()); 1079 1080 // Finish attaching the main thread. 1081 ScopedObjectAccess soa(Thread::Current()); 1082 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1083 1084 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1085} 1086 1087void Thread::Shutdown() { 1088 CHECK(is_started_); 1089 is_started_ = false; 1090 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1091 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1092 if (resume_cond_ != nullptr) { 1093 delete resume_cond_; 1094 resume_cond_ = nullptr; 1095 } 1096} 1097 1098Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1099 wait_mutex_ = new Mutex("a thread wait mutex"); 1100 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1101 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1102 tlsPtr_.single_step_control = new SingleStepControl; 1103 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1104 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1105 1106 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1107 tls32_.state_and_flags.as_struct.flags = 0; 1108 tls32_.state_and_flags.as_struct.state = kNative; 1109 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1110 std::fill(tlsPtr_.rosalloc_runs, 1111 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1112 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1113 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1114 tlsPtr_.checkpoint_functions[i] = nullptr; 1115 } 1116} 1117 1118bool Thread::IsStillStarting() const { 1119 // You might think you can check whether the state is kStarting, but for much of thread startup, 1120 // the thread is in kNative; it might also be in kVmWait. 1121 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1122 // assigned fairly early on, and needs to be. 1123 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1124 // this thread _ever_ entered kRunnable". 1125 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1126 (*tlsPtr_.name == kThreadNameDuringStartup); 1127} 1128 1129void Thread::AssertNoPendingException() const { 1130 if (UNLIKELY(IsExceptionPending())) { 1131 ScopedObjectAccess soa(Thread::Current()); 1132 mirror::Throwable* exception = GetException(nullptr); 1133 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1134 } 1135} 1136 1137void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1138 if (UNLIKELY(IsExceptionPending())) { 1139 ScopedObjectAccess soa(Thread::Current()); 1140 mirror::Throwable* exception = GetException(nullptr); 1141 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1142 << exception->Dump(); 1143 } 1144} 1145 1146static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1147 RootType /*root_type*/) 1148 NO_THREAD_SAFETY_ANALYSIS { 1149 Thread* self = reinterpret_cast<Thread*>(arg); 1150 mirror::Object* entered_monitor = *object; 1151 if (self->HoldsLock(entered_monitor)) { 1152 LOG(WARNING) << "Calling MonitorExit on object " 1153 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1154 << " left locked by native thread " 1155 << *Thread::Current() << " which is detaching"; 1156 entered_monitor->MonitorExit(self); 1157 } 1158} 1159 1160void Thread::Destroy() { 1161 Thread* self = this; 1162 DCHECK_EQ(self, Thread::Current()); 1163 1164 if (tlsPtr_.jni_env != nullptr) { 1165 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1166 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1167 // Release locally held global references which releasing may require the mutator lock. 1168 if (tlsPtr_.jpeer != nullptr) { 1169 // If pthread_create fails we don't have a jni env here. 1170 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1171 tlsPtr_.jpeer = nullptr; 1172 } 1173 if (tlsPtr_.class_loader_override != nullptr) { 1174 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.class_loader_override); 1175 tlsPtr_.class_loader_override = nullptr; 1176 } 1177 } 1178 1179 if (tlsPtr_.opeer != nullptr) { 1180 ScopedObjectAccess soa(self); 1181 // We may need to call user-supplied managed code, do this before final clean-up. 1182 HandleUncaughtExceptions(soa); 1183 RemoveFromThreadGroup(soa); 1184 1185 // this.nativePeer = 0; 1186 if (Runtime::Current()->IsActiveTransaction()) { 1187 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1188 ->SetLong<true>(tlsPtr_.opeer, 0); 1189 } else { 1190 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1191 ->SetLong<false>(tlsPtr_.opeer, 0); 1192 } 1193 Dbg::PostThreadDeath(self); 1194 1195 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1196 // who is waiting. 1197 mirror::Object* lock = 1198 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1199 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1200 if (lock != nullptr) { 1201 StackHandleScope<1> hs(self); 1202 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1203 ObjectLock<mirror::Object> locker(self, h_obj); 1204 locker.NotifyAll(); 1205 } 1206 tlsPtr_.opeer = nullptr; 1207 } 1208 1209 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1210} 1211 1212Thread::~Thread() { 1213 CHECK(tlsPtr_.class_loader_override == nullptr); 1214 CHECK(tlsPtr_.jpeer == nullptr); 1215 CHECK(tlsPtr_.opeer == nullptr); 1216 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1217 if (initialized) { 1218 delete tlsPtr_.jni_env; 1219 tlsPtr_.jni_env = nullptr; 1220 } 1221 CHECK_NE(GetState(), kRunnable); 1222 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1223 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1224 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1225 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1226 1227 // We may be deleting a still born thread. 1228 SetStateUnsafe(kTerminated); 1229 1230 delete wait_cond_; 1231 delete wait_mutex_; 1232 1233 if (tlsPtr_.long_jump_context != nullptr) { 1234 delete tlsPtr_.long_jump_context; 1235 } 1236 1237 if (initialized) { 1238 CleanupCpu(); 1239 } 1240 1241 delete tlsPtr_.debug_invoke_req; 1242 delete tlsPtr_.single_step_control; 1243 delete tlsPtr_.instrumentation_stack; 1244 delete tlsPtr_.name; 1245 delete tlsPtr_.stack_trace_sample; 1246 1247 Runtime::Current()->GetHeap()->AssertThreadLocalBuffersAreRevoked(this); 1248 1249 TearDownAlternateSignalStack(); 1250} 1251 1252void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1253 if (!IsExceptionPending()) { 1254 return; 1255 } 1256 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1257 ScopedThreadStateChange tsc(this, kNative); 1258 1259 // Get and clear the exception. 1260 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1261 tlsPtr_.jni_env->ExceptionClear(); 1262 1263 // If the thread has its own handler, use that. 1264 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1265 tlsPtr_.jni_env->GetObjectField(peer.get(), 1266 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1267 if (handler.get() == nullptr) { 1268 // Otherwise use the thread group's default handler. 1269 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1270 WellKnownClasses::java_lang_Thread_group)); 1271 } 1272 1273 // Call the handler. 1274 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1275 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1276 peer.get(), exception.get()); 1277 1278 // If the handler threw, clear that exception too. 1279 tlsPtr_.jni_env->ExceptionClear(); 1280} 1281 1282void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1283 // this.group.removeThread(this); 1284 // group can be null if we're in the compiler or a test. 1285 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1286 ->GetObject(tlsPtr_.opeer); 1287 if (ogroup != nullptr) { 1288 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1289 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1290 ScopedThreadStateChange tsc(soa.Self(), kNative); 1291 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1292 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1293 peer.get()); 1294 } 1295} 1296 1297size_t Thread::NumHandleReferences() { 1298 size_t count = 0; 1299 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1300 count += cur->NumberOfReferences(); 1301 } 1302 return count; 1303} 1304 1305bool Thread::HandleScopeContains(jobject obj) const { 1306 StackReference<mirror::Object>* hs_entry = 1307 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1308 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1309 if (cur->Contains(hs_entry)) { 1310 return true; 1311 } 1312 } 1313 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1314 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1315} 1316 1317void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1318 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1319 size_t num_refs = cur->NumberOfReferences(); 1320 for (size_t j = 0; j < num_refs; ++j) { 1321 mirror::Object* object = cur->GetReference(j); 1322 if (object != nullptr) { 1323 mirror::Object* old_obj = object; 1324 visitor(&object, arg, thread_id, kRootNativeStack); 1325 if (old_obj != object) { 1326 cur->SetReference(j, object); 1327 } 1328 } 1329 } 1330 } 1331} 1332 1333mirror::Object* Thread::DecodeJObject(jobject obj) const { 1334 Locks::mutator_lock_->AssertSharedHeld(this); 1335 if (obj == nullptr) { 1336 return nullptr; 1337 } 1338 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1339 IndirectRefKind kind = GetIndirectRefKind(ref); 1340 mirror::Object* result; 1341 // The "kinds" below are sorted by the frequency we expect to encounter them. 1342 if (kind == kLocal) { 1343 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1344 // Local references do not need a read barrier. 1345 result = locals.Get<kWithoutReadBarrier>(ref); 1346 } else if (kind == kHandleScopeOrInvalid) { 1347 // TODO: make stack indirect reference table lookup more efficient. 1348 // Check if this is a local reference in the handle scope. 1349 if (LIKELY(HandleScopeContains(obj))) { 1350 // Read from handle scope. 1351 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1352 VerifyObject(result); 1353 } else { 1354 result = kInvalidIndirectRefObject; 1355 } 1356 } else if (kind == kGlobal) { 1357 result = tlsPtr_.jni_env->vm->DecodeGlobal(const_cast<Thread*>(this), ref); 1358 } else { 1359 DCHECK_EQ(kind, kWeakGlobal); 1360 result = tlsPtr_.jni_env->vm->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1361 if (result == kClearedJniWeakGlobal) { 1362 // This is a special case where it's okay to return nullptr. 1363 return nullptr; 1364 } 1365 } 1366 1367 if (UNLIKELY(result == nullptr)) { 1368 tlsPtr_.jni_env->vm->JniAbortF(nullptr, "use of deleted %s %p", 1369 ToStr<IndirectRefKind>(kind).c_str(), obj); 1370 } 1371 return result; 1372} 1373 1374// Implements java.lang.Thread.interrupted. 1375bool Thread::Interrupted() { 1376 MutexLock mu(Thread::Current(), *wait_mutex_); 1377 bool interrupted = IsInterruptedLocked(); 1378 SetInterruptedLocked(false); 1379 return interrupted; 1380} 1381 1382// Implements java.lang.Thread.isInterrupted. 1383bool Thread::IsInterrupted() { 1384 MutexLock mu(Thread::Current(), *wait_mutex_); 1385 return IsInterruptedLocked(); 1386} 1387 1388void Thread::Interrupt(Thread* self) { 1389 MutexLock mu(self, *wait_mutex_); 1390 if (interrupted_) { 1391 return; 1392 } 1393 interrupted_ = true; 1394 NotifyLocked(self); 1395} 1396 1397void Thread::Notify() { 1398 Thread* self = Thread::Current(); 1399 MutexLock mu(self, *wait_mutex_); 1400 NotifyLocked(self); 1401} 1402 1403void Thread::NotifyLocked(Thread* self) { 1404 if (wait_monitor_ != nullptr) { 1405 wait_cond_->Signal(self); 1406 } 1407} 1408 1409void Thread::SetClassLoaderOverride(jobject class_loader_override) { 1410 if (tlsPtr_.class_loader_override != nullptr) { 1411 GetJniEnv()->DeleteGlobalRef(tlsPtr_.class_loader_override); 1412 } 1413 tlsPtr_.class_loader_override = GetJniEnv()->NewGlobalRef(class_loader_override); 1414} 1415 1416class CountStackDepthVisitor : public StackVisitor { 1417 public: 1418 explicit CountStackDepthVisitor(Thread* thread) 1419 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1420 : StackVisitor(thread, nullptr), 1421 depth_(0), skip_depth_(0), skipping_(true) {} 1422 1423 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1424 // We want to skip frames up to and including the exception's constructor. 1425 // Note we also skip the frame if it doesn't have a method (namely the callee 1426 // save frame) 1427 mirror::ArtMethod* m = GetMethod(); 1428 if (skipping_ && !m->IsRuntimeMethod() && 1429 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1430 skipping_ = false; 1431 } 1432 if (!skipping_) { 1433 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1434 ++depth_; 1435 } 1436 } else { 1437 ++skip_depth_; 1438 } 1439 return true; 1440 } 1441 1442 int GetDepth() const { 1443 return depth_; 1444 } 1445 1446 int GetSkipDepth() const { 1447 return skip_depth_; 1448 } 1449 1450 private: 1451 uint32_t depth_; 1452 uint32_t skip_depth_; 1453 bool skipping_; 1454}; 1455 1456template<bool kTransactionActive> 1457class BuildInternalStackTraceVisitor : public StackVisitor { 1458 public: 1459 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1460 : StackVisitor(thread, nullptr), self_(self), 1461 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1462 1463 bool Init(int depth) 1464 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1465 // Allocate method trace with an extra slot that will hold the PC trace 1466 StackHandleScope<1> hs(self_); 1467 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1468 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1469 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1470 if (method_trace.Get() == nullptr) { 1471 return false; 1472 } 1473 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1474 if (dex_pc_trace == nullptr) { 1475 return false; 1476 } 1477 // Save PC trace in last element of method trace, also places it into the 1478 // object graph. 1479 // We are called from native: use non-transactional mode. 1480 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1481 // Set the Object*s and assert that no thread suspension is now possible. 1482 const char* last_no_suspend_cause = 1483 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1484 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1485 method_trace_ = method_trace.Get(); 1486 dex_pc_trace_ = dex_pc_trace; 1487 return true; 1488 } 1489 1490 virtual ~BuildInternalStackTraceVisitor() { 1491 if (method_trace_ != nullptr) { 1492 self_->EndAssertNoThreadSuspension(nullptr); 1493 } 1494 } 1495 1496 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1497 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1498 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1499 } 1500 if (skip_depth_ > 0) { 1501 skip_depth_--; 1502 return true; 1503 } 1504 mirror::ArtMethod* m = GetMethod(); 1505 if (m->IsRuntimeMethod()) { 1506 return true; // Ignore runtime frames (in particular callee save). 1507 } 1508 method_trace_->Set<kTransactionActive>(count_, m); 1509 dex_pc_trace_->Set<kTransactionActive>(count_, 1510 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1511 ++count_; 1512 return true; 1513 } 1514 1515 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1516 return method_trace_; 1517 } 1518 1519 private: 1520 Thread* const self_; 1521 // How many more frames to skip. 1522 int32_t skip_depth_; 1523 // Current position down stack trace. 1524 uint32_t count_; 1525 // Array of dex PC values. 1526 mirror::IntArray* dex_pc_trace_; 1527 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1528 mirror::ObjectArray<mirror::Object>* method_trace_; 1529}; 1530 1531template<bool kTransactionActive> 1532jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1533 // Compute depth of stack 1534 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1535 count_visitor.WalkStack(); 1536 int32_t depth = count_visitor.GetDepth(); 1537 int32_t skip_depth = count_visitor.GetSkipDepth(); 1538 1539 // Build internal stack trace. 1540 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1541 const_cast<Thread*>(this), 1542 skip_depth); 1543 if (!build_trace_visitor.Init(depth)) { 1544 return nullptr; // Allocation failed. 1545 } 1546 build_trace_visitor.WalkStack(); 1547 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1548 if (kIsDebugBuild) { 1549 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1550 CHECK(trace->Get(i) != nullptr); 1551 } 1552 } 1553 return soa.AddLocalReference<jobjectArray>(trace); 1554} 1555template jobject Thread::CreateInternalStackTrace<false>( 1556 const ScopedObjectAccessAlreadyRunnable& soa) const; 1557template jobject Thread::CreateInternalStackTrace<true>( 1558 const ScopedObjectAccessAlreadyRunnable& soa) const; 1559 1560jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1561 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1562 int* stack_depth) { 1563 // Decode the internal stack trace into the depth, method trace and PC trace 1564 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1565 1566 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1567 1568 jobjectArray result; 1569 1570 if (output_array != nullptr) { 1571 // Reuse the array we were given. 1572 result = output_array; 1573 // ...adjusting the number of frames we'll write to not exceed the array length. 1574 const int32_t traces_length = 1575 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1576 depth = std::min(depth, traces_length); 1577 } else { 1578 // Create java_trace array and place in local reference table 1579 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1580 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1581 if (java_traces == nullptr) { 1582 return nullptr; 1583 } 1584 result = soa.AddLocalReference<jobjectArray>(java_traces); 1585 } 1586 1587 if (stack_depth != nullptr) { 1588 *stack_depth = depth; 1589 } 1590 1591 for (int32_t i = 0; i < depth; ++i) { 1592 mirror::ObjectArray<mirror::Object>* method_trace = 1593 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1594 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1595 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1596 int32_t line_number; 1597 StackHandleScope<3> hs(soa.Self()); 1598 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1599 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1600 if (method->IsProxyMethod()) { 1601 line_number = -1; 1602 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1603 // source_name_object intentionally left null for proxy methods 1604 } else { 1605 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1606 uint32_t dex_pc = pc_trace->Get(i); 1607 line_number = method->GetLineNumFromDexPC(dex_pc); 1608 // Allocate element, potentially triggering GC 1609 // TODO: reuse class_name_object via Class::name_? 1610 const char* descriptor = method->GetDeclaringClassDescriptor(); 1611 CHECK(descriptor != nullptr); 1612 std::string class_name(PrettyDescriptor(descriptor)); 1613 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1614 if (class_name_object.Get() == nullptr) { 1615 return nullptr; 1616 } 1617 const char* source_file = method->GetDeclaringClassSourceFile(); 1618 if (source_file != nullptr) { 1619 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1620 if (source_name_object.Get() == nullptr) { 1621 return nullptr; 1622 } 1623 } 1624 } 1625 const char* method_name = method->GetName(); 1626 CHECK(method_name != nullptr); 1627 Handle<mirror::String> method_name_object( 1628 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1629 if (method_name_object.Get() == nullptr) { 1630 return nullptr; 1631 } 1632 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1633 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1634 if (obj == nullptr) { 1635 return nullptr; 1636 } 1637 // We are called from native: use non-transactional mode. 1638 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1639 } 1640 return result; 1641} 1642 1643void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1644 const char* exception_class_descriptor, const char* fmt, ...) { 1645 va_list args; 1646 va_start(args, fmt); 1647 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1648 fmt, args); 1649 va_end(args); 1650} 1651 1652void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1653 const char* exception_class_descriptor, 1654 const char* fmt, va_list ap) { 1655 std::string msg; 1656 StringAppendV(&msg, fmt, ap); 1657 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1658} 1659 1660void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1661 const char* msg) { 1662 // Callers should either clear or call ThrowNewWrappedException. 1663 AssertNoPendingExceptionForNewException(msg); 1664 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1665} 1666 1667void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1668 const char* exception_class_descriptor, 1669 const char* msg) { 1670 DCHECK_EQ(this, Thread::Current()); 1671 ScopedObjectAccessUnchecked soa(this); 1672 StackHandleScope<5> hs(soa.Self()); 1673 // Ensure we don't forget arguments over object allocation. 1674 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1675 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1676 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1677 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1678 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1679 ClearException(); 1680 Runtime* runtime = Runtime::Current(); 1681 1682 mirror::ClassLoader* cl = nullptr; 1683 if (saved_throw_method.Get() != nullptr) { 1684 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1685 } 1686 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1687 Handle<mirror::Class> exception_class( 1688 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1689 class_loader))); 1690 if (UNLIKELY(exception_class.Get() == nullptr)) { 1691 CHECK(IsExceptionPending()); 1692 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1693 return; 1694 } 1695 1696 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1697 DCHECK(IsExceptionPending()); 1698 return; 1699 } 1700 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1701 Handle<mirror::Throwable> exception( 1702 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1703 1704 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1705 if (exception.Get() == nullptr) { 1706 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1707 throw_location.GetDexPc()); 1708 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1709 SetExceptionReportedToInstrumentation(is_exception_reported); 1710 return; 1711 } 1712 1713 // Choose an appropriate constructor and set up the arguments. 1714 const char* signature; 1715 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1716 if (msg != nullptr) { 1717 // Ensure we remember this and the method over the String allocation. 1718 msg_string.reset( 1719 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1720 if (UNLIKELY(msg_string.get() == nullptr)) { 1721 CHECK(IsExceptionPending()); // OOME. 1722 return; 1723 } 1724 if (cause.get() == nullptr) { 1725 signature = "(Ljava/lang/String;)V"; 1726 } else { 1727 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1728 } 1729 } else { 1730 if (cause.get() == nullptr) { 1731 signature = "()V"; 1732 } else { 1733 signature = "(Ljava/lang/Throwable;)V"; 1734 } 1735 } 1736 mirror::ArtMethod* exception_init_method = 1737 exception_class->FindDeclaredDirectMethod("<init>", signature); 1738 1739 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1740 << PrettyDescriptor(exception_class_descriptor); 1741 1742 if (UNLIKELY(!runtime->IsStarted())) { 1743 // Something is trying to throw an exception without a started runtime, which is the common 1744 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1745 // the exception fields directly. 1746 if (msg != nullptr) { 1747 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1748 } 1749 if (cause.get() != nullptr) { 1750 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1751 } 1752 ScopedLocalRef<jobject> trace(GetJniEnv(), 1753 Runtime::Current()->IsActiveTransaction() 1754 ? CreateInternalStackTrace<true>(soa) 1755 : CreateInternalStackTrace<false>(soa)); 1756 if (trace.get() != nullptr) { 1757 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1758 } 1759 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1760 throw_location.GetDexPc()); 1761 SetException(gc_safe_throw_location, exception.Get()); 1762 SetExceptionReportedToInstrumentation(is_exception_reported); 1763 } else { 1764 jvalue jv_args[2]; 1765 size_t i = 0; 1766 1767 if (msg != nullptr) { 1768 jv_args[i].l = msg_string.get(); 1769 ++i; 1770 } 1771 if (cause.get() != nullptr) { 1772 jv_args[i].l = cause.get(); 1773 ++i; 1774 } 1775 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1776 if (LIKELY(!IsExceptionPending())) { 1777 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1778 throw_location.GetDexPc()); 1779 SetException(gc_safe_throw_location, exception.Get()); 1780 SetExceptionReportedToInstrumentation(is_exception_reported); 1781 } 1782 } 1783} 1784 1785void Thread::ThrowOutOfMemoryError(const char* msg) { 1786 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1787 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1788 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1789 if (!tls32_.throwing_OutOfMemoryError) { 1790 tls32_.throwing_OutOfMemoryError = true; 1791 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1792 tls32_.throwing_OutOfMemoryError = false; 1793 } else { 1794 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1795 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1796 } 1797} 1798 1799Thread* Thread::CurrentFromGdb() { 1800 return Thread::Current(); 1801} 1802 1803void Thread::DumpFromGdb() const { 1804 std::ostringstream ss; 1805 Dump(ss); 1806 std::string str(ss.str()); 1807 // log to stderr for debugging command line processes 1808 std::cerr << str; 1809#ifdef HAVE_ANDROID_OS 1810 // log to logcat for debugging frameworks processes 1811 LOG(INFO) << str; 1812#endif 1813} 1814 1815// Explicitly instantiate 32 and 64bit thread offset dumping support. 1816template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1817template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1818 1819template<size_t ptr_size> 1820void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1821#define DO_THREAD_OFFSET(x, y) \ 1822 if (offset == x.Uint32Value()) { \ 1823 os << y; \ 1824 return; \ 1825 } 1826 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1827 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1828 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1829 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1830 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1831 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1832 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1833 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1834 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1835 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1836 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1837 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1838 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1839#undef DO_THREAD_OFFSET 1840 1841#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1842 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1843 os << #x; \ 1844 return; \ 1845 } 1846 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1847 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1848#undef INTERPRETER_ENTRY_POINT_INFO 1849 1850#define JNI_ENTRY_POINT_INFO(x) \ 1851 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1852 os << #x; \ 1853 return; \ 1854 } 1855 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1856#undef JNI_ENTRY_POINT_INFO 1857 1858#define PORTABLE_ENTRY_POINT_INFO(x) \ 1859 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1860 os << #x; \ 1861 return; \ 1862 } 1863 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1864 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1865 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1866#undef PORTABLE_ENTRY_POINT_INFO 1867 1868#define QUICK_ENTRY_POINT_INFO(x) \ 1869 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1870 os << #x; \ 1871 return; \ 1872 } 1873 QUICK_ENTRY_POINT_INFO(pAllocArray) 1874 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1875 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1876 QUICK_ENTRY_POINT_INFO(pAllocObject) 1877 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1878 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1879 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1880 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1881 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1882 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1883 QUICK_ENTRY_POINT_INFO(pCheckCast) 1884 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1885 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1886 QUICK_ENTRY_POINT_INFO(pInitializeType) 1887 QUICK_ENTRY_POINT_INFO(pResolveString) 1888 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1889 QUICK_ENTRY_POINT_INFO(pSet32Static) 1890 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1891 QUICK_ENTRY_POINT_INFO(pSet64Static) 1892 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1893 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1894 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1895 QUICK_ENTRY_POINT_INFO(pGet32Static) 1896 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1897 QUICK_ENTRY_POINT_INFO(pGet64Static) 1898 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1899 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1900 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1901 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1902 QUICK_ENTRY_POINT_INFO(pAputObject) 1903 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1904 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1905 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1906 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1907 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1908 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1909 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1910 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1911 QUICK_ENTRY_POINT_INFO(pLockObject) 1912 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1913 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1914 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1915 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1916 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1917 QUICK_ENTRY_POINT_INFO(pFmod) 1918 QUICK_ENTRY_POINT_INFO(pL2d) 1919 QUICK_ENTRY_POINT_INFO(pFmodf) 1920 QUICK_ENTRY_POINT_INFO(pL2f) 1921 QUICK_ENTRY_POINT_INFO(pD2iz) 1922 QUICK_ENTRY_POINT_INFO(pF2iz) 1923 QUICK_ENTRY_POINT_INFO(pIdivmod) 1924 QUICK_ENTRY_POINT_INFO(pD2l) 1925 QUICK_ENTRY_POINT_INFO(pF2l) 1926 QUICK_ENTRY_POINT_INFO(pLdiv) 1927 QUICK_ENTRY_POINT_INFO(pLmod) 1928 QUICK_ENTRY_POINT_INFO(pLmul) 1929 QUICK_ENTRY_POINT_INFO(pShlLong) 1930 QUICK_ENTRY_POINT_INFO(pShrLong) 1931 QUICK_ENTRY_POINT_INFO(pUshrLong) 1932 QUICK_ENTRY_POINT_INFO(pIndexOf) 1933 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1934 QUICK_ENTRY_POINT_INFO(pMemcpy) 1935 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1936 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1937 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1938 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1939 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1940 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1941 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1942 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1943 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1944 QUICK_ENTRY_POINT_INFO(pDeliverException) 1945 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1946 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1947 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1948 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1949 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1950 QUICK_ENTRY_POINT_INFO(pA64Load) 1951 QUICK_ENTRY_POINT_INFO(pA64Store) 1952#undef QUICK_ENTRY_POINT_INFO 1953 1954 os << offset; 1955} 1956 1957void Thread::QuickDeliverException() { 1958 // Get exception from thread. 1959 ThrowLocation throw_location; 1960 mirror::Throwable* exception = GetException(&throw_location); 1961 CHECK(exception != nullptr); 1962 // Don't leave exception visible while we try to find the handler, which may cause class 1963 // resolution. 1964 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1965 ClearException(); 1966 bool is_deoptimization = (exception == GetDeoptimizationException()); 1967 QuickExceptionHandler exception_handler(this, is_deoptimization); 1968 if (is_deoptimization) { 1969 exception_handler.DeoptimizeStack(); 1970 } else { 1971 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1972 } 1973 exception_handler.UpdateInstrumentationStack(); 1974 exception_handler.DoLongJump(); 1975 LOG(FATAL) << "UNREACHABLE"; 1976} 1977 1978Context* Thread::GetLongJumpContext() { 1979 Context* result = tlsPtr_.long_jump_context; 1980 if (result == nullptr) { 1981 result = Context::Create(); 1982 } else { 1983 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1984 result->Reset(); 1985 } 1986 return result; 1987} 1988 1989// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 1990// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 1991struct CurrentMethodVisitor FINAL : public StackVisitor { 1992 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 1993 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1994 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0), 1995 abort_on_error_(abort_on_error) {} 1996 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1997 mirror::ArtMethod* m = GetMethod(); 1998 if (m->IsRuntimeMethod()) { 1999 // Continue if this is a runtime method. 2000 return true; 2001 } 2002 if (context_ != nullptr) { 2003 this_object_ = GetThisObject(); 2004 } 2005 method_ = m; 2006 dex_pc_ = GetDexPc(abort_on_error_); 2007 return false; 2008 } 2009 mirror::Object* this_object_; 2010 mirror::ArtMethod* method_; 2011 uint32_t dex_pc_; 2012 const bool abort_on_error_; 2013}; 2014 2015mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 2016 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 2017 visitor.WalkStack(false); 2018 if (dex_pc != nullptr) { 2019 *dex_pc = visitor.dex_pc_; 2020 } 2021 return visitor.method_; 2022} 2023 2024ThrowLocation Thread::GetCurrentLocationForThrow() { 2025 Context* context = GetLongJumpContext(); 2026 CurrentMethodVisitor visitor(this, context, true); 2027 visitor.WalkStack(false); 2028 ReleaseLongJumpContext(context); 2029 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 2030} 2031 2032bool Thread::HoldsLock(mirror::Object* object) const { 2033 if (object == nullptr) { 2034 return false; 2035 } 2036 return object->GetLockOwnerThreadId() == GetThreadId(); 2037} 2038 2039// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2040template <typename RootVisitor> 2041class ReferenceMapVisitor : public StackVisitor { 2042 public: 2043 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 2044 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2045 : StackVisitor(thread, context), visitor_(visitor) {} 2046 2047 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2048 if (false) { 2049 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2050 << StringPrintf("@ PC:%04x", GetDexPc()); 2051 } 2052 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2053 if (shadow_frame != nullptr) { 2054 VisitShadowFrame(shadow_frame); 2055 } else { 2056 VisitQuickFrame(); 2057 } 2058 return true; 2059 } 2060 2061 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2062 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 2063 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 2064 mirror::ArtMethod* m = *method_addr; 2065 DCHECK(m != nullptr); 2066 size_t num_regs = shadow_frame->NumberOfVRegs(); 2067 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2068 // handle scope for JNI or References for interpreter. 2069 for (size_t reg = 0; reg < num_regs; ++reg) { 2070 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2071 if (ref != nullptr) { 2072 mirror::Object* new_ref = ref; 2073 visitor_(&new_ref, reg, this); 2074 if (new_ref != ref) { 2075 shadow_frame->SetVRegReference(reg, new_ref); 2076 } 2077 } 2078 } 2079 } else { 2080 // Java method. 2081 // Portable path use DexGcMap and store in Method.native_gc_map_. 2082 const uint8_t* gc_map = m->GetNativeGcMap(); 2083 CHECK(gc_map != nullptr) << PrettyMethod(m); 2084 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2085 uint32_t dex_pc = shadow_frame->GetDexPC(); 2086 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2087 DCHECK(reg_bitmap != nullptr); 2088 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2089 for (size_t reg = 0; reg < num_regs; ++reg) { 2090 if (TestBitmap(reg, reg_bitmap)) { 2091 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2092 if (ref != nullptr) { 2093 mirror::Object* new_ref = ref; 2094 visitor_(&new_ref, reg, this); 2095 if (new_ref != ref) { 2096 shadow_frame->SetVRegReference(reg, new_ref); 2097 } 2098 } 2099 } 2100 } 2101 } 2102 } 2103 2104 private: 2105 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2106 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2107 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2108 mirror::ArtMethod* old_method = m; 2109 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2110 if (m != old_method) { 2111 cur_quick_frame->Assign(m); 2112 } 2113 2114 // Process register map (which native and runtime methods don't have) 2115 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2116 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2117 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2118 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2119 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2120 NativePcOffsetToReferenceMap map(native_gc_map); 2121 size_t num_regs = std::min(map.RegWidth() * 8, 2122 static_cast<size_t>(code_item->registers_size_)); 2123 if (num_regs > 0) { 2124 Runtime* runtime = Runtime::Current(); 2125 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2126 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2127 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2128 DCHECK(reg_bitmap != nullptr); 2129 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2130 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2131 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2132 // For all dex registers in the bitmap 2133 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2134 DCHECK(cur_quick_frame != nullptr); 2135 for (size_t reg = 0; reg < num_regs; ++reg) { 2136 // Does this register hold a reference? 2137 if (TestBitmap(reg, reg_bitmap)) { 2138 uint32_t vmap_offset; 2139 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2140 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2141 kReferenceVReg); 2142 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2143 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2144 if (*ref_addr != nullptr) { 2145 visitor_(ref_addr, reg, this); 2146 } 2147 } else { 2148 StackReference<mirror::Object>* ref_addr = 2149 reinterpret_cast<StackReference<mirror::Object>*>( 2150 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2151 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2152 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2153 if (ref != nullptr) { 2154 mirror::Object* new_ref = ref; 2155 visitor_(&new_ref, reg, this); 2156 if (ref != new_ref) { 2157 ref_addr->Assign(new_ref); 2158 } 2159 } 2160 } 2161 } 2162 } 2163 } 2164 } 2165 } 2166 2167 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2168 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2169 } 2170 2171 // Visitor for when we visit a root. 2172 const RootVisitor& visitor_; 2173}; 2174 2175class RootCallbackVisitor { 2176 public: 2177 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2178 : callback_(callback), arg_(arg), tid_(tid) {} 2179 2180 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2181 callback_(obj, arg_, tid_, kRootJavaFrame); 2182 } 2183 2184 private: 2185 RootCallback* const callback_; 2186 void* const arg_; 2187 const uint32_t tid_; 2188}; 2189 2190void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2191 uint32_t thread_id = GetThreadId(); 2192 if (tlsPtr_.opeer != nullptr) { 2193 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2194 } 2195 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2196 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2197 } 2198 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2199 if (tlsPtr_.monitor_enter_object != nullptr) { 2200 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2201 } 2202 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2203 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2204 HandleScopeVisitRoots(visitor, arg, thread_id); 2205 if (tlsPtr_.debug_invoke_req != nullptr) { 2206 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2207 } 2208 if (tlsPtr_.single_step_control != nullptr) { 2209 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2210 } 2211 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2212 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2213 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2214 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2215 shadow_frame = shadow_frame->GetLink()) { 2216 mapper.VisitShadowFrame(shadow_frame); 2217 } 2218 } 2219 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2220 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2221 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2222 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2223 shadow_frame != nullptr; 2224 shadow_frame = shadow_frame->GetLink()) { 2225 mapper.VisitShadowFrame(shadow_frame); 2226 } 2227 } 2228 // Visit roots on this thread's stack 2229 Context* context = GetLongJumpContext(); 2230 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2231 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2232 mapper.WalkStack(); 2233 ReleaseLongJumpContext(context); 2234 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2235 if (frame.this_object_ != nullptr) { 2236 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2237 } 2238 DCHECK(frame.method_ != nullptr); 2239 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2240 } 2241} 2242 2243static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2244 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2245 VerifyObject(*root); 2246} 2247 2248void Thread::VerifyStackImpl() { 2249 std::unique_ptr<Context> context(Context::Create()); 2250 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2251 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2252 mapper.WalkStack(); 2253} 2254 2255// Set the stack end to that to be used during a stack overflow 2256void Thread::SetStackEndForStackOverflow() { 2257 // During stack overflow we allow use of the full stack. 2258 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2259 // However, we seem to have already extended to use the full stack. 2260 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2261 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2262 DumpStack(LOG(ERROR)); 2263 LOG(FATAL) << "Recursive stack overflow."; 2264 } 2265 2266 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2267} 2268 2269void Thread::SetTlab(byte* start, byte* end) { 2270 DCHECK_LE(start, end); 2271 tlsPtr_.thread_local_start = start; 2272 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2273 tlsPtr_.thread_local_end = end; 2274 tlsPtr_.thread_local_objects = 0; 2275} 2276 2277bool Thread::HasTlab() const { 2278 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2279 if (has_tlab) { 2280 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2281 } else { 2282 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2283 } 2284 return has_tlab; 2285} 2286 2287std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2288 thread.ShortDump(os); 2289 return os; 2290} 2291 2292} // namespace art 2293