thread.cc revision 564f58305961986591ccb2fff04b9ccdd430a6db
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 } 229 230 // Some systems require the stack size to be a multiple of the system page size, so round up. 231 stack_size = RoundUp(stack_size, kPageSize); 232 233 return stack_size; 234} 235 236// Global variable to prevent the compiler optimizing away the page reads for the stack. 237byte dont_optimize_this; 238 239// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 240// overflow is detected. It is located right below the stack_begin_. 241// 242// There is a little complexity here that deserves a special mention. On some 243// architectures, the stack created using a VM_GROWSDOWN flag 244// to prevent memory being allocated when it's not needed. This flag makes the 245// kernel only allocate memory for the stack by growing down in memory. Because we 246// want to put an mprotected region far away from that at the stack top, we need 247// to make sure the pages for the stack are mapped in before we call mprotect. We do 248// this by reading every page from the stack bottom (highest address) to the stack top. 249// We then madvise this away. 250void Thread::InstallImplicitProtection() { 251 byte* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 252 byte* stack_himem = tlsPtr_.stack_end; 253 byte* stack_top = reinterpret_cast<byte*>(reinterpret_cast<uintptr_t>(&stack_himem) & 254 ~(kPageSize - 1)); // Page containing current top of stack. 255 256 // First remove the protection on the protected region as will want to read and 257 // write it. This may fail (on the first attempt when the stack is not mapped) 258 // but we ignore that. 259 UnprotectStack(); 260 261 // Map in the stack. This must be done by reading from the 262 // current stack pointer downwards as the stack may be mapped using VM_GROWSDOWN 263 // in the kernel. Any access more than a page below the current SP might cause 264 // a segv. 265 266 // Read every page from the high address to the low. 267 for (byte* p = stack_top; p > pregion; p -= kPageSize) { 268 dont_optimize_this = *p; 269 } 270 271 VLOG(threads) << "installing stack protected region at " << std::hex << 272 static_cast<void*>(pregion) << " to " << 273 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 274 275 // Protect the bottom of the stack to prevent read/write to it. 276 ProtectStack(); 277 278 // Tell the kernel that we won't be needing these pages any more. 279 // NB. madvise will probably write zeroes into the memory (on linux it does). 280 uint32_t unwanted_size = stack_top - pregion - kPageSize; 281 madvise(pregion, unwanted_size, MADV_DONTNEED); 282} 283 284void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 285 CHECK(java_peer != nullptr); 286 Thread* self = static_cast<JNIEnvExt*>(env)->self; 287 Runtime* runtime = Runtime::Current(); 288 289 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 290 bool thread_start_during_shutdown = false; 291 { 292 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 293 if (runtime->IsShuttingDownLocked()) { 294 thread_start_during_shutdown = true; 295 } else { 296 runtime->StartThreadBirth(); 297 } 298 } 299 if (thread_start_during_shutdown) { 300 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 301 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 302 return; 303 } 304 305 Thread* child_thread = new Thread(is_daemon); 306 // Use global JNI ref to hold peer live while child thread starts. 307 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 308 stack_size = FixStackSize(stack_size); 309 310 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 311 // assign it. 312 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 313 reinterpret_cast<jlong>(child_thread)); 314 315 pthread_t new_pthread; 316 pthread_attr_t attr; 317 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 318 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 319 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 320 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 321 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 322 323 if (pthread_create_result != 0) { 324 // pthread_create(3) failed, so clean up. 325 { 326 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 327 runtime->EndThreadBirth(); 328 } 329 // Manually delete the global reference since Thread::Init will not have been run. 330 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 331 child_thread->tlsPtr_.jpeer = nullptr; 332 delete child_thread; 333 child_thread = nullptr; 334 // TODO: remove from thread group? 335 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 336 { 337 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 338 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 339 ScopedObjectAccess soa(env); 340 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 341 } 342 } 343} 344 345void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 346 // This function does all the initialization that must be run by the native thread it applies to. 347 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 348 // we can handshake with the corresponding native thread when it's ready.) Check this native 349 // thread hasn't been through here already... 350 CHECK(Thread::Current() == nullptr); 351 SetUpAlternateSignalStack(); 352 InitCpu(); 353 InitTlsEntryPoints(); 354 RemoveSuspendTrigger(); 355 InitCardTable(); 356 InitTid(); 357 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 358 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 359 tlsPtr_.pthread_self = pthread_self(); 360 CHECK(is_started_); 361 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 362 DCHECK_EQ(Thread::Current(), this); 363 364 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 365 InitStackHwm(); 366 367 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 368 thread_list->Register(this); 369} 370 371Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 372 bool create_peer) { 373 Thread* self; 374 Runtime* runtime = Runtime::Current(); 375 if (runtime == nullptr) { 376 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 377 return nullptr; 378 } 379 { 380 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 381 if (runtime->IsShuttingDownLocked()) { 382 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 383 return nullptr; 384 } else { 385 Runtime::Current()->StartThreadBirth(); 386 self = new Thread(as_daemon); 387 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 388 Runtime::Current()->EndThreadBirth(); 389 } 390 } 391 392 CHECK_NE(self->GetState(), kRunnable); 393 self->SetState(kNative); 394 395 // If we're the main thread, ClassLinker won't be created until after we're attached, 396 // so that thread needs a two-stage attach. Regular threads don't need this hack. 397 // In the compiler, all threads need this hack, because no-one's going to be getting 398 // a native peer! 399 if (create_peer) { 400 self->CreatePeer(thread_name, as_daemon, thread_group); 401 } else { 402 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 403 if (thread_name != nullptr) { 404 self->tlsPtr_.name->assign(thread_name); 405 ::art::SetThreadName(thread_name); 406 } 407 } 408 409 return self; 410} 411 412void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 413 Runtime* runtime = Runtime::Current(); 414 CHECK(runtime->IsStarted()); 415 JNIEnv* env = tlsPtr_.jni_env; 416 417 if (thread_group == nullptr) { 418 thread_group = runtime->GetMainThreadGroup(); 419 } 420 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 421 jint thread_priority = GetNativePriority(); 422 jboolean thread_is_daemon = as_daemon; 423 424 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 425 if (peer.get() == nullptr) { 426 CHECK(IsExceptionPending()); 427 return; 428 } 429 { 430 ScopedObjectAccess soa(this); 431 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 432 } 433 env->CallNonvirtualVoidMethod(peer.get(), 434 WellKnownClasses::java_lang_Thread, 435 WellKnownClasses::java_lang_Thread_init, 436 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 437 AssertNoPendingException(); 438 439 Thread* self = this; 440 DCHECK_EQ(self, Thread::Current()); 441 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 442 reinterpret_cast<jlong>(self)); 443 444 ScopedObjectAccess soa(self); 445 StackHandleScope<1> hs(self); 446 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 447 if (peer_thread_name.Get() == nullptr) { 448 // The Thread constructor should have set the Thread.name to a 449 // non-null value. However, because we can run without code 450 // available (in the compiler, in tests), we manually assign the 451 // fields the constructor should have set. 452 if (runtime->IsActiveTransaction()) { 453 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 454 } else { 455 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 456 } 457 peer_thread_name.Assign(GetThreadName(soa)); 458 } 459 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 460 if (peer_thread_name.Get() != nullptr) { 461 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 462 } 463} 464 465template<bool kTransactionActive> 466void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 467 jobject thread_name, jint thread_priority) { 468 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 469 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 470 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 471 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 472 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 473 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 474 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 475 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 476} 477 478void Thread::SetThreadName(const char* name) { 479 tlsPtr_.name->assign(name); 480 ::art::SetThreadName(name); 481 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 482} 483 484void Thread::InitStackHwm() { 485 void* read_stack_base; 486 size_t read_stack_size; 487 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 488 489 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 490 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 491 PrettySize(read_stack_size).c_str()); 492 493 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 494 tlsPtr_.stack_size = read_stack_size; 495 496 // The minimum stack size we can cope with is the overflow reserved bytes (typically 497 // 8K) + the protected region size (4K) + another page (4K). Typically this will 498 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 499 // between 8K and 12K. 500 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 501 + 4 * KB; 502 if (read_stack_size <= min_stack) { 503 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 504 << " bytes)"; 505 } 506 507 // TODO: move this into the Linux GetThreadStack implementation. 508#if !defined(__APPLE__) 509 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 510 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 511 // will be broken because we'll die long before we get close to 2GB. 512 bool is_main_thread = (::art::GetTid() == getpid()); 513 if (is_main_thread) { 514 rlimit stack_limit; 515 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 516 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 517 } 518 if (stack_limit.rlim_cur == RLIM_INFINITY) { 519 // Find the default stack size for new threads... 520 pthread_attr_t default_attributes; 521 size_t default_stack_size; 522 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 523 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 524 "default stack size query"); 525 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 526 527 // ...and use that as our limit. 528 size_t old_stack_size = read_stack_size; 529 tlsPtr_.stack_size = default_stack_size; 530 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 531 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 532 << " to " << PrettySize(default_stack_size) 533 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 534 } 535 } 536#endif 537 538 // Set stack_end_ to the bottom of the stack saving space of stack overflows 539 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 540 ResetDefaultStackEnd(implicit_stack_check); 541 542 // Install the protected region if we are doing implicit overflow checks. 543 if (implicit_stack_check) { 544 size_t guardsize; 545 pthread_attr_t attributes; 546 CHECK_PTHREAD_CALL(pthread_attr_init, (&attributes), "guard size query"); 547 CHECK_PTHREAD_CALL(pthread_attr_getguardsize, (&attributes, &guardsize), "guard size query"); 548 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attributes), "guard size query"); 549 // The thread might have protected region at the bottom. We need 550 // to install our own region so we need to move the limits 551 // of the stack to make room for it. 552 tlsPtr_.stack_begin += guardsize; 553 tlsPtr_.stack_end += guardsize; 554 tlsPtr_.stack_size -= guardsize; 555 556 InstallImplicitProtection(); 557 } 558 559 // Sanity check. 560 int stack_variable; 561 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 562} 563 564void Thread::ShortDump(std::ostream& os) const { 565 os << "Thread["; 566 if (GetThreadId() != 0) { 567 // If we're in kStarting, we won't have a thin lock id or tid yet. 568 os << GetThreadId() 569 << ",tid=" << GetTid() << ','; 570 } 571 os << GetState() 572 << ",Thread*=" << this 573 << ",peer=" << tlsPtr_.opeer 574 << ",\"" << *tlsPtr_.name << "\"" 575 << "]"; 576} 577 578void Thread::Dump(std::ostream& os) const { 579 DumpState(os); 580 DumpStack(os); 581} 582 583mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 584 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 585 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 586} 587 588void Thread::GetThreadName(std::string& name) const { 589 name.assign(*tlsPtr_.name); 590} 591 592uint64_t Thread::GetCpuMicroTime() const { 593#if defined(HAVE_POSIX_CLOCKS) 594 clockid_t cpu_clock_id; 595 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 596 timespec now; 597 clock_gettime(cpu_clock_id, &now); 598 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 599#else 600 UNIMPLEMENTED(WARNING); 601 return -1; 602#endif 603} 604 605// Attempt to rectify locks so that we dump thread list with required locks before exiting. 606static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 607 LOG(ERROR) << *thread << " suspend count already zero."; 608 Locks::thread_suspend_count_lock_->Unlock(self); 609 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 610 Locks::mutator_lock_->SharedTryLock(self); 611 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 612 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 613 } 614 } 615 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 616 Locks::thread_list_lock_->TryLock(self); 617 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 618 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 619 } 620 } 621 std::ostringstream ss; 622 Runtime::Current()->GetThreadList()->DumpLocked(ss); 623 LOG(FATAL) << ss.str(); 624} 625 626void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 627 if (kIsDebugBuild) { 628 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 629 << delta << " " << tls32_.debug_suspend_count << " " << this; 630 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 631 Locks::thread_suspend_count_lock_->AssertHeld(self); 632 if (this != self && !IsSuspended()) { 633 Locks::thread_list_lock_->AssertHeld(self); 634 } 635 } 636 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 637 UnsafeLogFatalForSuspendCount(self, this); 638 return; 639 } 640 641 tls32_.suspend_count += delta; 642 if (for_debugger) { 643 tls32_.debug_suspend_count += delta; 644 } 645 646 if (tls32_.suspend_count == 0) { 647 AtomicClearFlag(kSuspendRequest); 648 } else { 649 AtomicSetFlag(kSuspendRequest); 650 TriggerSuspend(); 651 } 652} 653 654void Thread::RunCheckpointFunction() { 655 Closure *checkpoints[kMaxCheckpoints]; 656 657 // Grab the suspend_count lock and copy the current set of 658 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 659 // function will also grab this lock so we prevent a race between setting 660 // the kCheckpointRequest flag and clearing it. 661 { 662 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 663 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 664 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 665 tlsPtr_.checkpoint_functions[i] = nullptr; 666 } 667 AtomicClearFlag(kCheckpointRequest); 668 } 669 670 // Outside the lock, run all the checkpoint functions that 671 // we collected. 672 bool found_checkpoint = false; 673 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 674 if (checkpoints[i] != nullptr) { 675 ATRACE_BEGIN("Checkpoint function"); 676 checkpoints[i]->Run(this); 677 ATRACE_END(); 678 found_checkpoint = true; 679 } 680 } 681 CHECK(found_checkpoint); 682} 683 684bool Thread::RequestCheckpoint(Closure* function) { 685 union StateAndFlags old_state_and_flags; 686 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 687 if (old_state_and_flags.as_struct.state != kRunnable) { 688 return false; // Fail, thread is suspended and so can't run a checkpoint. 689 } 690 691 uint32_t available_checkpoint = kMaxCheckpoints; 692 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 693 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 694 available_checkpoint = i; 695 break; 696 } 697 } 698 if (available_checkpoint == kMaxCheckpoints) { 699 // No checkpoint functions available, we can't run a checkpoint 700 return false; 701 } 702 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 703 704 // Checkpoint function installed now install flag bit. 705 // We must be runnable to request a checkpoint. 706 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 707 union StateAndFlags new_state_and_flags; 708 new_state_and_flags.as_int = old_state_and_flags.as_int; 709 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 710 bool success = 711 tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent(old_state_and_flags.as_int, 712 new_state_and_flags.as_int); 713 if (UNLIKELY(!success)) { 714 // The thread changed state before the checkpoint was installed. 715 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 716 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 717 } else { 718 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 719 TriggerSuspend(); 720 } 721 return success; 722} 723 724void Thread::FullSuspendCheck() { 725 VLOG(threads) << this << " self-suspending"; 726 ATRACE_BEGIN("Full suspend check"); 727 // Make thread appear suspended to other threads, release mutator_lock_. 728 TransitionFromRunnableToSuspended(kSuspended); 729 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 730 TransitionFromSuspendedToRunnable(); 731 ATRACE_END(); 732 VLOG(threads) << this << " self-reviving"; 733} 734 735void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 736 std::string group_name; 737 int priority; 738 bool is_daemon = false; 739 Thread* self = Thread::Current(); 740 741 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 742 // cause ScopedObjectAccessUnchecked to deadlock. 743 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 744 ScopedObjectAccessUnchecked soa(self); 745 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 746 ->GetInt(thread->tlsPtr_.opeer); 747 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 748 ->GetBoolean(thread->tlsPtr_.opeer); 749 750 mirror::Object* thread_group = 751 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 752 753 if (thread_group != nullptr) { 754 mirror::ArtField* group_name_field = 755 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 756 mirror::String* group_name_string = 757 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 758 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 759 } 760 } else { 761 priority = GetNativePriority(); 762 } 763 764 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 765 if (scheduler_group_name.empty()) { 766 scheduler_group_name = "default"; 767 } 768 769 if (thread != nullptr) { 770 os << '"' << *thread->tlsPtr_.name << '"'; 771 if (is_daemon) { 772 os << " daemon"; 773 } 774 os << " prio=" << priority 775 << " tid=" << thread->GetThreadId() 776 << " " << thread->GetState(); 777 if (thread->IsStillStarting()) { 778 os << " (still starting up)"; 779 } 780 os << "\n"; 781 } else { 782 os << '"' << ::art::GetThreadName(tid) << '"' 783 << " prio=" << priority 784 << " (not attached)\n"; 785 } 786 787 if (thread != nullptr) { 788 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 789 os << " | group=\"" << group_name << "\"" 790 << " sCount=" << thread->tls32_.suspend_count 791 << " dsCount=" << thread->tls32_.debug_suspend_count 792 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 793 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 794 } 795 796 os << " | sysTid=" << tid 797 << " nice=" << getpriority(PRIO_PROCESS, tid) 798 << " cgrp=" << scheduler_group_name; 799 if (thread != nullptr) { 800 int policy; 801 sched_param sp; 802 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 803 __FUNCTION__); 804 os << " sched=" << policy << "/" << sp.sched_priority 805 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 806 } 807 os << "\n"; 808 809 // Grab the scheduler stats for this thread. 810 std::string scheduler_stats; 811 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 812 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 813 } else { 814 scheduler_stats = "0 0 0"; 815 } 816 817 char native_thread_state = '?'; 818 int utime = 0; 819 int stime = 0; 820 int task_cpu = 0; 821 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 822 823 os << " | state=" << native_thread_state 824 << " schedstat=( " << scheduler_stats << " )" 825 << " utm=" << utime 826 << " stm=" << stime 827 << " core=" << task_cpu 828 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 829 if (thread != nullptr) { 830 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 831 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 832 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 833 // Dump the held mutexes. 834 os << " | held mutexes="; 835 for (size_t i = 0; i < kLockLevelCount; ++i) { 836 if (i != kMonitorLock) { 837 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 838 if (mutex != nullptr) { 839 os << " \"" << mutex->GetName() << "\""; 840 if (mutex->IsReaderWriterMutex()) { 841 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 842 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 843 os << "(exclusive held)"; 844 } else { 845 os << "(shared held)"; 846 } 847 } 848 } 849 } 850 } 851 os << "\n"; 852 } 853} 854 855void Thread::DumpState(std::ostream& os) const { 856 Thread::DumpState(os, this, GetTid()); 857} 858 859struct StackDumpVisitor : public StackVisitor { 860 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 861 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 862 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 863 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 864 } 865 866 virtual ~StackDumpVisitor() { 867 if (frame_count == 0) { 868 os << " (no managed stack frames)\n"; 869 } 870 } 871 872 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 873 mirror::ArtMethod* m = GetMethod(); 874 if (m->IsRuntimeMethod()) { 875 return true; 876 } 877 const int kMaxRepetition = 3; 878 mirror::Class* c = m->GetDeclaringClass(); 879 mirror::DexCache* dex_cache = c->GetDexCache(); 880 int line_number = -1; 881 if (dex_cache != nullptr) { // be tolerant of bad input 882 const DexFile& dex_file = *dex_cache->GetDexFile(); 883 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 884 } 885 if (line_number == last_line_number && last_method == m) { 886 ++repetition_count; 887 } else { 888 if (repetition_count >= kMaxRepetition) { 889 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 890 } 891 repetition_count = 0; 892 last_line_number = line_number; 893 last_method = m; 894 } 895 if (repetition_count < kMaxRepetition) { 896 os << " at " << PrettyMethod(m, false); 897 if (m->IsNative()) { 898 os << "(Native method)"; 899 } else { 900 const char* source_file(m->GetDeclaringClassSourceFile()); 901 os << "(" << (source_file != nullptr ? source_file : "unavailable") 902 << ":" << line_number << ")"; 903 } 904 os << "\n"; 905 if (frame_count == 0) { 906 Monitor::DescribeWait(os, thread); 907 } 908 if (can_allocate) { 909 Monitor::VisitLocks(this, DumpLockedObject, &os); 910 } 911 } 912 913 ++frame_count; 914 return true; 915 } 916 917 static void DumpLockedObject(mirror::Object* o, void* context) 918 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 919 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 920 os << " - locked "; 921 if (o == nullptr) { 922 os << "an unknown object"; 923 } else { 924 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 925 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 926 // Getting the identity hashcode here would result in lock inflation and suspension of the 927 // current thread, which isn't safe if this is the only runnable thread. 928 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 929 PrettyTypeOf(o).c_str()); 930 } else { 931 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 932 } 933 } 934 os << "\n"; 935 } 936 937 std::ostream& os; 938 const Thread* thread; 939 const bool can_allocate; 940 mirror::ArtMethod* method; 941 mirror::ArtMethod* last_method; 942 int last_line_number; 943 int repetition_count; 944 int frame_count; 945}; 946 947static bool ShouldShowNativeStack(const Thread* thread) 948 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 949 ThreadState state = thread->GetState(); 950 951 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 952 if (state > kWaiting && state < kStarting) { 953 return true; 954 } 955 956 // In an Object.wait variant or Thread.sleep? That's not interesting. 957 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 958 return false; 959 } 960 961 // In some other native method? That's interesting. 962 // We don't just check kNative because native methods will be in state kSuspended if they're 963 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 964 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 965 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 966 return current_method != nullptr && current_method->IsNative(); 967} 968 969void Thread::DumpJavaStack(std::ostream& os) const { 970 std::unique_ptr<Context> context(Context::Create()); 971 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 972 !tls32_.throwing_OutOfMemoryError); 973 dumper.WalkStack(); 974} 975 976void Thread::DumpStack(std::ostream& os) const { 977 // TODO: we call this code when dying but may not have suspended the thread ourself. The 978 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 979 // the race with the thread_suspend_count_lock_). 980 bool dump_for_abort = (gAborting > 0); 981 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 982 if (!kIsDebugBuild) { 983 // We always want to dump the stack for an abort, however, there is no point dumping another 984 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 985 safe_to_dump = (safe_to_dump || dump_for_abort); 986 } 987 if (safe_to_dump) { 988 // If we're currently in native code, dump that stack before dumping the managed stack. 989 if (dump_for_abort || ShouldShowNativeStack(this)) { 990 DumpKernelStack(os, GetTid(), " kernel: ", false); 991 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr)); 992 } 993 DumpJavaStack(os); 994 } else { 995 os << "Not able to dump stack of thread that isn't suspended"; 996 } 997} 998 999void Thread::ThreadExitCallback(void* arg) { 1000 Thread* self = reinterpret_cast<Thread*>(arg); 1001 if (self->tls32_.thread_exit_check_count == 0) { 1002 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1003 "going to use a pthread_key_create destructor?): " << *self; 1004 CHECK(is_started_); 1005 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1006 self->tls32_.thread_exit_check_count = 1; 1007 } else { 1008 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1009 } 1010} 1011 1012void Thread::Startup() { 1013 CHECK(!is_started_); 1014 is_started_ = true; 1015 { 1016 // MutexLock to keep annotalysis happy. 1017 // 1018 // Note we use nullptr for the thread because Thread::Current can 1019 // return garbage since (is_started_ == true) and 1020 // Thread::pthread_key_self_ is not yet initialized. 1021 // This was seen on glibc. 1022 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1023 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1024 *Locks::thread_suspend_count_lock_); 1025 } 1026 1027 // Allocate a TLS slot. 1028 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1029 1030 // Double-check the TLS slot allocation. 1031 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1032 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1033 } 1034} 1035 1036void Thread::FinishStartup() { 1037 Runtime* runtime = Runtime::Current(); 1038 CHECK(runtime->IsStarted()); 1039 1040 // Finish attaching the main thread. 1041 ScopedObjectAccess soa(Thread::Current()); 1042 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1043 1044 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1045} 1046 1047void Thread::Shutdown() { 1048 CHECK(is_started_); 1049 is_started_ = false; 1050 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1051 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1052 if (resume_cond_ != nullptr) { 1053 delete resume_cond_; 1054 resume_cond_ = nullptr; 1055 } 1056} 1057 1058Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1059 wait_mutex_ = new Mutex("a thread wait mutex"); 1060 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1061 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1062 tlsPtr_.single_step_control = new SingleStepControl; 1063 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1064 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1065 1066 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1067 tls32_.state_and_flags.as_struct.flags = 0; 1068 tls32_.state_and_flags.as_struct.state = kNative; 1069 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1070 std::fill(tlsPtr_.rosalloc_runs, 1071 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1072 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1073 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1074 tlsPtr_.checkpoint_functions[i] = nullptr; 1075 } 1076} 1077 1078bool Thread::IsStillStarting() const { 1079 // You might think you can check whether the state is kStarting, but for much of thread startup, 1080 // the thread is in kNative; it might also be in kVmWait. 1081 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1082 // assigned fairly early on, and needs to be. 1083 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1084 // this thread _ever_ entered kRunnable". 1085 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1086 (*tlsPtr_.name == kThreadNameDuringStartup); 1087} 1088 1089void Thread::AssertNoPendingException() const { 1090 if (UNLIKELY(IsExceptionPending())) { 1091 ScopedObjectAccess soa(Thread::Current()); 1092 mirror::Throwable* exception = GetException(nullptr); 1093 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1094 } 1095} 1096 1097void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1098 if (UNLIKELY(IsExceptionPending())) { 1099 ScopedObjectAccess soa(Thread::Current()); 1100 mirror::Throwable* exception = GetException(nullptr); 1101 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1102 << exception->Dump(); 1103 } 1104} 1105 1106static void MonitorExitVisitor(mirror::Object** object, void* arg, uint32_t /*thread_id*/, 1107 RootType /*root_type*/) 1108 NO_THREAD_SAFETY_ANALYSIS { 1109 Thread* self = reinterpret_cast<Thread*>(arg); 1110 mirror::Object* entered_monitor = *object; 1111 if (self->HoldsLock(entered_monitor)) { 1112 LOG(WARNING) << "Calling MonitorExit on object " 1113 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1114 << " left locked by native thread " 1115 << *Thread::Current() << " which is detaching"; 1116 entered_monitor->MonitorExit(self); 1117 } 1118} 1119 1120void Thread::Destroy() { 1121 Thread* self = this; 1122 DCHECK_EQ(self, Thread::Current()); 1123 1124 if (tlsPtr_.opeer != nullptr) { 1125 ScopedObjectAccess soa(self); 1126 // We may need to call user-supplied managed code, do this before final clean-up. 1127 HandleUncaughtExceptions(soa); 1128 RemoveFromThreadGroup(soa); 1129 1130 // this.nativePeer = 0; 1131 if (Runtime::Current()->IsActiveTransaction()) { 1132 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1133 ->SetLong<true>(tlsPtr_.opeer, 0); 1134 } else { 1135 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1136 ->SetLong<false>(tlsPtr_.opeer, 0); 1137 } 1138 Dbg::PostThreadDeath(self); 1139 1140 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1141 // who is waiting. 1142 mirror::Object* lock = 1143 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1144 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1145 if (lock != nullptr) { 1146 StackHandleScope<1> hs(self); 1147 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1148 ObjectLock<mirror::Object> locker(self, h_obj); 1149 locker.NotifyAll(); 1150 } 1151 } 1152 1153 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1154 if (tlsPtr_.jni_env != nullptr) { 1155 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1156 } 1157} 1158 1159Thread::~Thread() { 1160 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1161 // If pthread_create fails we don't have a jni env here. 1162 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1163 tlsPtr_.jpeer = nullptr; 1164 } 1165 tlsPtr_.opeer = nullptr; 1166 1167 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1168 if (initialized) { 1169 delete tlsPtr_.jni_env; 1170 tlsPtr_.jni_env = nullptr; 1171 } 1172 CHECK_NE(GetState(), kRunnable); 1173 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1174 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1175 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1176 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1177 1178 // We may be deleting a still born thread. 1179 SetStateUnsafe(kTerminated); 1180 1181 delete wait_cond_; 1182 delete wait_mutex_; 1183 1184 if (tlsPtr_.long_jump_context != nullptr) { 1185 delete tlsPtr_.long_jump_context; 1186 } 1187 1188 if (initialized) { 1189 CleanupCpu(); 1190 } 1191 1192 delete tlsPtr_.debug_invoke_req; 1193 delete tlsPtr_.single_step_control; 1194 delete tlsPtr_.instrumentation_stack; 1195 delete tlsPtr_.name; 1196 delete tlsPtr_.stack_trace_sample; 1197 1198 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1199 1200 TearDownAlternateSignalStack(); 1201} 1202 1203void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1204 if (!IsExceptionPending()) { 1205 return; 1206 } 1207 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1208 ScopedThreadStateChange tsc(this, kNative); 1209 1210 // Get and clear the exception. 1211 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1212 tlsPtr_.jni_env->ExceptionClear(); 1213 1214 // If the thread has its own handler, use that. 1215 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1216 tlsPtr_.jni_env->GetObjectField(peer.get(), 1217 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1218 if (handler.get() == nullptr) { 1219 // Otherwise use the thread group's default handler. 1220 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1221 WellKnownClasses::java_lang_Thread_group)); 1222 } 1223 1224 // Call the handler. 1225 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1226 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1227 peer.get(), exception.get()); 1228 1229 // If the handler threw, clear that exception too. 1230 tlsPtr_.jni_env->ExceptionClear(); 1231} 1232 1233void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1234 // this.group.removeThread(this); 1235 // group can be null if we're in the compiler or a test. 1236 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1237 ->GetObject(tlsPtr_.opeer); 1238 if (ogroup != nullptr) { 1239 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1240 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1241 ScopedThreadStateChange tsc(soa.Self(), kNative); 1242 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1243 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1244 peer.get()); 1245 } 1246} 1247 1248size_t Thread::NumHandleReferences() { 1249 size_t count = 0; 1250 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1251 count += cur->NumberOfReferences(); 1252 } 1253 return count; 1254} 1255 1256bool Thread::HandleScopeContains(jobject obj) const { 1257 StackReference<mirror::Object>* hs_entry = 1258 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1259 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1260 if (cur->Contains(hs_entry)) { 1261 return true; 1262 } 1263 } 1264 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1265 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1266} 1267 1268void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1269 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1270 size_t num_refs = cur->NumberOfReferences(); 1271 for (size_t j = 0; j < num_refs; ++j) { 1272 mirror::Object* object = cur->GetReference(j); 1273 if (object != nullptr) { 1274 mirror::Object* old_obj = object; 1275 visitor(&object, arg, thread_id, kRootNativeStack); 1276 if (old_obj != object) { 1277 cur->SetReference(j, object); 1278 } 1279 } 1280 } 1281 } 1282} 1283 1284mirror::Object* Thread::DecodeJObject(jobject obj) const { 1285 Locks::mutator_lock_->AssertSharedHeld(this); 1286 if (obj == nullptr) { 1287 return nullptr; 1288 } 1289 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1290 IndirectRefKind kind = GetIndirectRefKind(ref); 1291 mirror::Object* result; 1292 // The "kinds" below are sorted by the frequency we expect to encounter them. 1293 if (kind == kLocal) { 1294 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1295 // Local references do not need a read barrier. 1296 result = locals.Get<kWithoutReadBarrier>(ref); 1297 } else if (kind == kHandleScopeOrInvalid) { 1298 // TODO: make stack indirect reference table lookup more efficient. 1299 // Check if this is a local reference in the handle scope. 1300 if (LIKELY(HandleScopeContains(obj))) { 1301 // Read from handle scope. 1302 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1303 VerifyObject(result); 1304 } else { 1305 result = kInvalidIndirectRefObject; 1306 } 1307 } else if (kind == kGlobal) { 1308 JavaVMExt* const vm = Runtime::Current()->GetJavaVM(); 1309 result = vm->globals.SynchronizedGet(const_cast<Thread*>(this), &vm->globals_lock, ref); 1310 } else { 1311 DCHECK_EQ(kind, kWeakGlobal); 1312 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1313 if (result == kClearedJniWeakGlobal) { 1314 // This is a special case where it's okay to return nullptr. 1315 return nullptr; 1316 } 1317 } 1318 1319 if (UNLIKELY(result == nullptr)) { 1320 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1321 } 1322 return result; 1323} 1324 1325// Implements java.lang.Thread.interrupted. 1326bool Thread::Interrupted() { 1327 MutexLock mu(Thread::Current(), *wait_mutex_); 1328 bool interrupted = IsInterruptedLocked(); 1329 SetInterruptedLocked(false); 1330 return interrupted; 1331} 1332 1333// Implements java.lang.Thread.isInterrupted. 1334bool Thread::IsInterrupted() { 1335 MutexLock mu(Thread::Current(), *wait_mutex_); 1336 return IsInterruptedLocked(); 1337} 1338 1339void Thread::Interrupt(Thread* self) { 1340 MutexLock mu(self, *wait_mutex_); 1341 if (interrupted_) { 1342 return; 1343 } 1344 interrupted_ = true; 1345 NotifyLocked(self); 1346} 1347 1348void Thread::Notify() { 1349 Thread* self = Thread::Current(); 1350 MutexLock mu(self, *wait_mutex_); 1351 NotifyLocked(self); 1352} 1353 1354void Thread::NotifyLocked(Thread* self) { 1355 if (wait_monitor_ != nullptr) { 1356 wait_cond_->Signal(self); 1357 } 1358} 1359 1360class CountStackDepthVisitor : public StackVisitor { 1361 public: 1362 explicit CountStackDepthVisitor(Thread* thread) 1363 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1364 : StackVisitor(thread, nullptr), 1365 depth_(0), skip_depth_(0), skipping_(true) {} 1366 1367 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1368 // We want to skip frames up to and including the exception's constructor. 1369 // Note we also skip the frame if it doesn't have a method (namely the callee 1370 // save frame) 1371 mirror::ArtMethod* m = GetMethod(); 1372 if (skipping_ && !m->IsRuntimeMethod() && 1373 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1374 skipping_ = false; 1375 } 1376 if (!skipping_) { 1377 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1378 ++depth_; 1379 } 1380 } else { 1381 ++skip_depth_; 1382 } 1383 return true; 1384 } 1385 1386 int GetDepth() const { 1387 return depth_; 1388 } 1389 1390 int GetSkipDepth() const { 1391 return skip_depth_; 1392 } 1393 1394 private: 1395 uint32_t depth_; 1396 uint32_t skip_depth_; 1397 bool skipping_; 1398}; 1399 1400template<bool kTransactionActive> 1401class BuildInternalStackTraceVisitor : public StackVisitor { 1402 public: 1403 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1404 : StackVisitor(thread, nullptr), self_(self), 1405 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1406 1407 bool Init(int depth) 1408 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1409 // Allocate method trace with an extra slot that will hold the PC trace 1410 StackHandleScope<1> hs(self_); 1411 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1412 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1413 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1414 if (method_trace.Get() == nullptr) { 1415 return false; 1416 } 1417 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1418 if (dex_pc_trace == nullptr) { 1419 return false; 1420 } 1421 // Save PC trace in last element of method trace, also places it into the 1422 // object graph. 1423 // We are called from native: use non-transactional mode. 1424 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1425 // Set the Object*s and assert that no thread suspension is now possible. 1426 const char* last_no_suspend_cause = 1427 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1428 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1429 method_trace_ = method_trace.Get(); 1430 dex_pc_trace_ = dex_pc_trace; 1431 return true; 1432 } 1433 1434 virtual ~BuildInternalStackTraceVisitor() { 1435 if (method_trace_ != nullptr) { 1436 self_->EndAssertNoThreadSuspension(nullptr); 1437 } 1438 } 1439 1440 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1441 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1442 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1443 } 1444 if (skip_depth_ > 0) { 1445 skip_depth_--; 1446 return true; 1447 } 1448 mirror::ArtMethod* m = GetMethod(); 1449 if (m->IsRuntimeMethod()) { 1450 return true; // Ignore runtime frames (in particular callee save). 1451 } 1452 method_trace_->Set<kTransactionActive>(count_, m); 1453 dex_pc_trace_->Set<kTransactionActive>(count_, 1454 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1455 ++count_; 1456 return true; 1457 } 1458 1459 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1460 return method_trace_; 1461 } 1462 1463 private: 1464 Thread* const self_; 1465 // How many more frames to skip. 1466 int32_t skip_depth_; 1467 // Current position down stack trace. 1468 uint32_t count_; 1469 // Array of dex PC values. 1470 mirror::IntArray* dex_pc_trace_; 1471 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1472 mirror::ObjectArray<mirror::Object>* method_trace_; 1473}; 1474 1475template<bool kTransactionActive> 1476jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1477 // Compute depth of stack 1478 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1479 count_visitor.WalkStack(); 1480 int32_t depth = count_visitor.GetDepth(); 1481 int32_t skip_depth = count_visitor.GetSkipDepth(); 1482 1483 // Build internal stack trace. 1484 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1485 const_cast<Thread*>(this), 1486 skip_depth); 1487 if (!build_trace_visitor.Init(depth)) { 1488 return nullptr; // Allocation failed. 1489 } 1490 build_trace_visitor.WalkStack(); 1491 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1492 if (kIsDebugBuild) { 1493 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1494 CHECK(trace->Get(i) != nullptr); 1495 } 1496 } 1497 return soa.AddLocalReference<jobjectArray>(trace); 1498} 1499template jobject Thread::CreateInternalStackTrace<false>( 1500 const ScopedObjectAccessAlreadyRunnable& soa) const; 1501template jobject Thread::CreateInternalStackTrace<true>( 1502 const ScopedObjectAccessAlreadyRunnable& soa) const; 1503 1504jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1505 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1506 int* stack_depth) { 1507 // Decode the internal stack trace into the depth, method trace and PC trace 1508 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1509 1510 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1511 1512 jobjectArray result; 1513 1514 if (output_array != nullptr) { 1515 // Reuse the array we were given. 1516 result = output_array; 1517 // ...adjusting the number of frames we'll write to not exceed the array length. 1518 const int32_t traces_length = 1519 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1520 depth = std::min(depth, traces_length); 1521 } else { 1522 // Create java_trace array and place in local reference table 1523 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1524 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1525 if (java_traces == nullptr) { 1526 return nullptr; 1527 } 1528 result = soa.AddLocalReference<jobjectArray>(java_traces); 1529 } 1530 1531 if (stack_depth != nullptr) { 1532 *stack_depth = depth; 1533 } 1534 1535 for (int32_t i = 0; i < depth; ++i) { 1536 mirror::ObjectArray<mirror::Object>* method_trace = 1537 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1538 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1539 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1540 int32_t line_number; 1541 StackHandleScope<3> hs(soa.Self()); 1542 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1543 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1544 if (method->IsProxyMethod()) { 1545 line_number = -1; 1546 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1547 // source_name_object intentionally left null for proxy methods 1548 } else { 1549 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1550 uint32_t dex_pc = pc_trace->Get(i); 1551 line_number = method->GetLineNumFromDexPC(dex_pc); 1552 // Allocate element, potentially triggering GC 1553 // TODO: reuse class_name_object via Class::name_? 1554 const char* descriptor = method->GetDeclaringClassDescriptor(); 1555 CHECK(descriptor != nullptr); 1556 std::string class_name(PrettyDescriptor(descriptor)); 1557 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1558 if (class_name_object.Get() == nullptr) { 1559 return nullptr; 1560 } 1561 const char* source_file = method->GetDeclaringClassSourceFile(); 1562 if (source_file != nullptr) { 1563 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1564 if (source_name_object.Get() == nullptr) { 1565 return nullptr; 1566 } 1567 } 1568 } 1569 const char* method_name = method->GetName(); 1570 CHECK(method_name != nullptr); 1571 Handle<mirror::String> method_name_object( 1572 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1573 if (method_name_object.Get() == nullptr) { 1574 return nullptr; 1575 } 1576 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1577 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1578 if (obj == nullptr) { 1579 return nullptr; 1580 } 1581 // We are called from native: use non-transactional mode. 1582 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1583 } 1584 return result; 1585} 1586 1587void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1588 const char* exception_class_descriptor, const char* fmt, ...) { 1589 va_list args; 1590 va_start(args, fmt); 1591 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1592 fmt, args); 1593 va_end(args); 1594} 1595 1596void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1597 const char* exception_class_descriptor, 1598 const char* fmt, va_list ap) { 1599 std::string msg; 1600 StringAppendV(&msg, fmt, ap); 1601 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1602} 1603 1604void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1605 const char* msg) { 1606 // Callers should either clear or call ThrowNewWrappedException. 1607 AssertNoPendingExceptionForNewException(msg); 1608 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1609} 1610 1611void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1612 const char* exception_class_descriptor, 1613 const char* msg) { 1614 DCHECK_EQ(this, Thread::Current()); 1615 ScopedObjectAccessUnchecked soa(this); 1616 StackHandleScope<5> hs(soa.Self()); 1617 // Ensure we don't forget arguments over object allocation. 1618 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1619 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1620 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1621 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1622 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1623 ClearException(); 1624 Runtime* runtime = Runtime::Current(); 1625 1626 mirror::ClassLoader* cl = nullptr; 1627 if (saved_throw_method.Get() != nullptr) { 1628 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1629 } 1630 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1631 Handle<mirror::Class> exception_class( 1632 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1633 class_loader))); 1634 if (UNLIKELY(exception_class.Get() == nullptr)) { 1635 CHECK(IsExceptionPending()); 1636 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1637 return; 1638 } 1639 1640 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1641 DCHECK(IsExceptionPending()); 1642 return; 1643 } 1644 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1645 Handle<mirror::Throwable> exception( 1646 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1647 1648 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1649 if (exception.Get() == nullptr) { 1650 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1651 throw_location.GetDexPc()); 1652 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1653 SetExceptionReportedToInstrumentation(is_exception_reported); 1654 return; 1655 } 1656 1657 // Choose an appropriate constructor and set up the arguments. 1658 const char* signature; 1659 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1660 if (msg != nullptr) { 1661 // Ensure we remember this and the method over the String allocation. 1662 msg_string.reset( 1663 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1664 if (UNLIKELY(msg_string.get() == nullptr)) { 1665 CHECK(IsExceptionPending()); // OOME. 1666 return; 1667 } 1668 if (cause.get() == nullptr) { 1669 signature = "(Ljava/lang/String;)V"; 1670 } else { 1671 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1672 } 1673 } else { 1674 if (cause.get() == nullptr) { 1675 signature = "()V"; 1676 } else { 1677 signature = "(Ljava/lang/Throwable;)V"; 1678 } 1679 } 1680 mirror::ArtMethod* exception_init_method = 1681 exception_class->FindDeclaredDirectMethod("<init>", signature); 1682 1683 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1684 << PrettyDescriptor(exception_class_descriptor); 1685 1686 if (UNLIKELY(!runtime->IsStarted())) { 1687 // Something is trying to throw an exception without a started runtime, which is the common 1688 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1689 // the exception fields directly. 1690 if (msg != nullptr) { 1691 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1692 } 1693 if (cause.get() != nullptr) { 1694 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1695 } 1696 ScopedLocalRef<jobject> trace(GetJniEnv(), 1697 Runtime::Current()->IsActiveTransaction() 1698 ? CreateInternalStackTrace<true>(soa) 1699 : CreateInternalStackTrace<false>(soa)); 1700 if (trace.get() != nullptr) { 1701 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1702 } 1703 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1704 throw_location.GetDexPc()); 1705 SetException(gc_safe_throw_location, exception.Get()); 1706 SetExceptionReportedToInstrumentation(is_exception_reported); 1707 } else { 1708 jvalue jv_args[2]; 1709 size_t i = 0; 1710 1711 if (msg != nullptr) { 1712 jv_args[i].l = msg_string.get(); 1713 ++i; 1714 } 1715 if (cause.get() != nullptr) { 1716 jv_args[i].l = cause.get(); 1717 ++i; 1718 } 1719 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1720 if (LIKELY(!IsExceptionPending())) { 1721 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1722 throw_location.GetDexPc()); 1723 SetException(gc_safe_throw_location, exception.Get()); 1724 SetExceptionReportedToInstrumentation(is_exception_reported); 1725 } 1726 } 1727} 1728 1729void Thread::ThrowOutOfMemoryError(const char* msg) { 1730 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1731 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1732 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1733 if (!tls32_.throwing_OutOfMemoryError) { 1734 tls32_.throwing_OutOfMemoryError = true; 1735 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1736 tls32_.throwing_OutOfMemoryError = false; 1737 } else { 1738 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1739 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1740 } 1741} 1742 1743Thread* Thread::CurrentFromGdb() { 1744 return Thread::Current(); 1745} 1746 1747void Thread::DumpFromGdb() const { 1748 std::ostringstream ss; 1749 Dump(ss); 1750 std::string str(ss.str()); 1751 // log to stderr for debugging command line processes 1752 std::cerr << str; 1753#ifdef HAVE_ANDROID_OS 1754 // log to logcat for debugging frameworks processes 1755 LOG(INFO) << str; 1756#endif 1757} 1758 1759// Explicitly instantiate 32 and 64bit thread offset dumping support. 1760template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1761template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1762 1763template<size_t ptr_size> 1764void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1765#define DO_THREAD_OFFSET(x, y) \ 1766 if (offset == x.Uint32Value()) { \ 1767 os << y; \ 1768 return; \ 1769 } 1770 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1771 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1772 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1773 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1774 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1775 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1776 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1777 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1778 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1779 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1780 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1781 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1782 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1783#undef DO_THREAD_OFFSET 1784 1785#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1786 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1787 os << #x; \ 1788 return; \ 1789 } 1790 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1791 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1792#undef INTERPRETER_ENTRY_POINT_INFO 1793 1794#define JNI_ENTRY_POINT_INFO(x) \ 1795 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1796 os << #x; \ 1797 return; \ 1798 } 1799 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1800#undef JNI_ENTRY_POINT_INFO 1801 1802#define PORTABLE_ENTRY_POINT_INFO(x) \ 1803 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1804 os << #x; \ 1805 return; \ 1806 } 1807 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1808 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1809 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1810#undef PORTABLE_ENTRY_POINT_INFO 1811 1812#define QUICK_ENTRY_POINT_INFO(x) \ 1813 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1814 os << #x; \ 1815 return; \ 1816 } 1817 QUICK_ENTRY_POINT_INFO(pAllocArray) 1818 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1819 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1820 QUICK_ENTRY_POINT_INFO(pAllocObject) 1821 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1822 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1823 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1824 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1825 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1826 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1827 QUICK_ENTRY_POINT_INFO(pCheckCast) 1828 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1829 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1830 QUICK_ENTRY_POINT_INFO(pInitializeType) 1831 QUICK_ENTRY_POINT_INFO(pResolveString) 1832 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1833 QUICK_ENTRY_POINT_INFO(pSet32Static) 1834 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1835 QUICK_ENTRY_POINT_INFO(pSet64Static) 1836 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1837 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1838 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1839 QUICK_ENTRY_POINT_INFO(pGet32Static) 1840 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1841 QUICK_ENTRY_POINT_INFO(pGet64Static) 1842 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1843 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1844 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1845 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1846 QUICK_ENTRY_POINT_INFO(pAputObject) 1847 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1848 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1849 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1850 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1851 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1852 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1853 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1854 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1855 QUICK_ENTRY_POINT_INFO(pLockObject) 1856 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1857 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1858 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1859 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1860 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1861 QUICK_ENTRY_POINT_INFO(pFmod) 1862 QUICK_ENTRY_POINT_INFO(pL2d) 1863 QUICK_ENTRY_POINT_INFO(pFmodf) 1864 QUICK_ENTRY_POINT_INFO(pL2f) 1865 QUICK_ENTRY_POINT_INFO(pD2iz) 1866 QUICK_ENTRY_POINT_INFO(pF2iz) 1867 QUICK_ENTRY_POINT_INFO(pIdivmod) 1868 QUICK_ENTRY_POINT_INFO(pD2l) 1869 QUICK_ENTRY_POINT_INFO(pF2l) 1870 QUICK_ENTRY_POINT_INFO(pLdiv) 1871 QUICK_ENTRY_POINT_INFO(pLmod) 1872 QUICK_ENTRY_POINT_INFO(pLmul) 1873 QUICK_ENTRY_POINT_INFO(pShlLong) 1874 QUICK_ENTRY_POINT_INFO(pShrLong) 1875 QUICK_ENTRY_POINT_INFO(pUshrLong) 1876 QUICK_ENTRY_POINT_INFO(pIndexOf) 1877 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1878 QUICK_ENTRY_POINT_INFO(pMemcpy) 1879 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1880 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1881 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1882 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1883 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1884 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1885 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1886 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1887 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1888 QUICK_ENTRY_POINT_INFO(pDeliverException) 1889 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1890 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1891 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1892 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1893 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1894 QUICK_ENTRY_POINT_INFO(pA64Load) 1895 QUICK_ENTRY_POINT_INFO(pA64Store) 1896#undef QUICK_ENTRY_POINT_INFO 1897 1898 os << offset; 1899} 1900 1901void Thread::QuickDeliverException() { 1902 // Get exception from thread. 1903 ThrowLocation throw_location; 1904 mirror::Throwable* exception = GetException(&throw_location); 1905 CHECK(exception != nullptr); 1906 // Don't leave exception visible while we try to find the handler, which may cause class 1907 // resolution. 1908 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1909 ClearException(); 1910 bool is_deoptimization = (exception == GetDeoptimizationException()); 1911 QuickExceptionHandler exception_handler(this, is_deoptimization); 1912 if (is_deoptimization) { 1913 exception_handler.DeoptimizeStack(); 1914 } else { 1915 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1916 } 1917 exception_handler.UpdateInstrumentationStack(); 1918 exception_handler.DoLongJump(); 1919 LOG(FATAL) << "UNREACHABLE"; 1920} 1921 1922Context* Thread::GetLongJumpContext() { 1923 Context* result = tlsPtr_.long_jump_context; 1924 if (result == nullptr) { 1925 result = Context::Create(); 1926 } else { 1927 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1928 result->Reset(); 1929 } 1930 return result; 1931} 1932 1933// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 1934// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 1935struct CurrentMethodVisitor FINAL : public StackVisitor { 1936 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 1937 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1938 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0), 1939 abort_on_error_(abort_on_error) {} 1940 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1941 mirror::ArtMethod* m = GetMethod(); 1942 if (m->IsRuntimeMethod()) { 1943 // Continue if this is a runtime method. 1944 return true; 1945 } 1946 if (context_ != nullptr) { 1947 this_object_ = GetThisObject(); 1948 } 1949 method_ = m; 1950 dex_pc_ = GetDexPc(abort_on_error_); 1951 return false; 1952 } 1953 mirror::Object* this_object_; 1954 mirror::ArtMethod* method_; 1955 uint32_t dex_pc_; 1956 const bool abort_on_error_; 1957}; 1958 1959mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 1960 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 1961 visitor.WalkStack(false); 1962 if (dex_pc != nullptr) { 1963 *dex_pc = visitor.dex_pc_; 1964 } 1965 return visitor.method_; 1966} 1967 1968ThrowLocation Thread::GetCurrentLocationForThrow() { 1969 Context* context = GetLongJumpContext(); 1970 CurrentMethodVisitor visitor(this, context, true); 1971 visitor.WalkStack(false); 1972 ReleaseLongJumpContext(context); 1973 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1974} 1975 1976bool Thread::HoldsLock(mirror::Object* object) const { 1977 if (object == nullptr) { 1978 return false; 1979 } 1980 return object->GetLockOwnerThreadId() == GetThreadId(); 1981} 1982 1983// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1984template <typename RootVisitor> 1985class ReferenceMapVisitor : public StackVisitor { 1986 public: 1987 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1988 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1989 : StackVisitor(thread, context), visitor_(visitor) {} 1990 1991 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1992 if (false) { 1993 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1994 << StringPrintf("@ PC:%04x", GetDexPc()); 1995 } 1996 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1997 if (shadow_frame != nullptr) { 1998 VisitShadowFrame(shadow_frame); 1999 } else { 2000 VisitQuickFrame(); 2001 } 2002 return true; 2003 } 2004 2005 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2006 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 2007 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 2008 mirror::ArtMethod* m = *method_addr; 2009 DCHECK(m != nullptr); 2010 size_t num_regs = shadow_frame->NumberOfVRegs(); 2011 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2012 // handle scope for JNI or References for interpreter. 2013 for (size_t reg = 0; reg < num_regs; ++reg) { 2014 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2015 if (ref != nullptr) { 2016 mirror::Object* new_ref = ref; 2017 visitor_(&new_ref, reg, this); 2018 if (new_ref != ref) { 2019 shadow_frame->SetVRegReference(reg, new_ref); 2020 } 2021 } 2022 } 2023 } else { 2024 // Java method. 2025 // Portable path use DexGcMap and store in Method.native_gc_map_. 2026 const uint8_t* gc_map = m->GetNativeGcMap(); 2027 CHECK(gc_map != nullptr) << PrettyMethod(m); 2028 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2029 uint32_t dex_pc = shadow_frame->GetDexPC(); 2030 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2031 DCHECK(reg_bitmap != nullptr); 2032 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2033 for (size_t reg = 0; reg < num_regs; ++reg) { 2034 if (TestBitmap(reg, reg_bitmap)) { 2035 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2036 if (ref != nullptr) { 2037 mirror::Object* new_ref = ref; 2038 visitor_(&new_ref, reg, this); 2039 if (new_ref != ref) { 2040 shadow_frame->SetVRegReference(reg, new_ref); 2041 } 2042 } 2043 } 2044 } 2045 } 2046 } 2047 2048 private: 2049 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2050 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2051 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2052 mirror::ArtMethod* old_method = m; 2053 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2054 if (m != old_method) { 2055 cur_quick_frame->Assign(m); 2056 } 2057 2058 // Process register map (which native and runtime methods don't have) 2059 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2060 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2061 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2062 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2063 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2064 NativePcOffsetToReferenceMap map(native_gc_map); 2065 size_t num_regs = std::min(map.RegWidth() * 8, 2066 static_cast<size_t>(code_item->registers_size_)); 2067 if (num_regs > 0) { 2068 Runtime* runtime = Runtime::Current(); 2069 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2070 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2071 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2072 DCHECK(reg_bitmap != nullptr); 2073 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2074 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2075 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2076 // For all dex registers in the bitmap 2077 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2078 DCHECK(cur_quick_frame != nullptr); 2079 for (size_t reg = 0; reg < num_regs; ++reg) { 2080 // Does this register hold a reference? 2081 if (TestBitmap(reg, reg_bitmap)) { 2082 uint32_t vmap_offset; 2083 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2084 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2085 kReferenceVReg); 2086 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2087 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2088 if (*ref_addr != nullptr) { 2089 visitor_(ref_addr, reg, this); 2090 } 2091 } else { 2092 StackReference<mirror::Object>* ref_addr = 2093 reinterpret_cast<StackReference<mirror::Object>*>( 2094 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2095 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2096 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2097 if (ref != nullptr) { 2098 mirror::Object* new_ref = ref; 2099 visitor_(&new_ref, reg, this); 2100 if (ref != new_ref) { 2101 ref_addr->Assign(new_ref); 2102 } 2103 } 2104 } 2105 } 2106 } 2107 } 2108 } 2109 } 2110 2111 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2112 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2113 } 2114 2115 // Visitor for when we visit a root. 2116 const RootVisitor& visitor_; 2117}; 2118 2119class RootCallbackVisitor { 2120 public: 2121 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2122 : callback_(callback), arg_(arg), tid_(tid) {} 2123 2124 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2125 callback_(obj, arg_, tid_, kRootJavaFrame); 2126 } 2127 2128 private: 2129 RootCallback* const callback_; 2130 void* const arg_; 2131 const uint32_t tid_; 2132}; 2133 2134void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2135 VerifyObject(class_loader_override); 2136 tlsPtr_.class_loader_override = class_loader_override; 2137} 2138 2139void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2140 uint32_t thread_id = GetThreadId(); 2141 if (tlsPtr_.opeer != nullptr) { 2142 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2143 } 2144 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2145 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2146 } 2147 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2148 if (tlsPtr_.class_loader_override != nullptr) { 2149 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, thread_id, 2150 kRootNativeStack); 2151 } 2152 if (tlsPtr_.monitor_enter_object != nullptr) { 2153 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2154 } 2155 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2156 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2157 HandleScopeVisitRoots(visitor, arg, thread_id); 2158 if (tlsPtr_.debug_invoke_req != nullptr) { 2159 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2160 } 2161 if (tlsPtr_.single_step_control != nullptr) { 2162 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2163 } 2164 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2165 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2166 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2167 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2168 shadow_frame = shadow_frame->GetLink()) { 2169 mapper.VisitShadowFrame(shadow_frame); 2170 } 2171 } 2172 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2173 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2174 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2175 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2176 shadow_frame != nullptr; 2177 shadow_frame = shadow_frame->GetLink()) { 2178 mapper.VisitShadowFrame(shadow_frame); 2179 } 2180 } 2181 // Visit roots on this thread's stack 2182 Context* context = GetLongJumpContext(); 2183 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2184 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2185 mapper.WalkStack(); 2186 ReleaseLongJumpContext(context); 2187 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2188 if (frame.this_object_ != nullptr) { 2189 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2190 } 2191 DCHECK(frame.method_ != nullptr); 2192 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2193 } 2194} 2195 2196static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2197 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2198 VerifyObject(*root); 2199} 2200 2201void Thread::VerifyStackImpl() { 2202 std::unique_ptr<Context> context(Context::Create()); 2203 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2204 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2205 mapper.WalkStack(); 2206} 2207 2208// Set the stack end to that to be used during a stack overflow 2209void Thread::SetStackEndForStackOverflow() { 2210 // During stack overflow we allow use of the full stack. 2211 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2212 // However, we seem to have already extended to use the full stack. 2213 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2214 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2215 DumpStack(LOG(ERROR)); 2216 LOG(FATAL) << "Recursive stack overflow."; 2217 } 2218 2219 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2220 2221 // Remove the stack overflow protection if is it set up. 2222 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2223 if (implicit_stack_check) { 2224 if (!UnprotectStack()) { 2225 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2226 } 2227 } 2228} 2229 2230void Thread::SetTlab(byte* start, byte* end) { 2231 DCHECK_LE(start, end); 2232 tlsPtr_.thread_local_start = start; 2233 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2234 tlsPtr_.thread_local_end = end; 2235 tlsPtr_.thread_local_objects = 0; 2236} 2237 2238bool Thread::HasTlab() const { 2239 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2240 if (has_tlab) { 2241 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2242 } else { 2243 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2244 } 2245 return has_tlab; 2246} 2247 2248std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2249 thread.ShortDump(os); 2250 return os; 2251} 2252 2253void Thread::ProtectStack() { 2254 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2255 VLOG(threads) << "Protecting stack at " << pregion; 2256 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2257 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2258 "Reason: " 2259 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2260 } 2261} 2262 2263bool Thread::UnprotectStack() { 2264 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2265 VLOG(threads) << "Unprotecting stack at " << pregion; 2266 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2267} 2268 2269 2270} // namespace art 2271