thread.cc revision 471b7cb6c1b8128bb343b49198f2654f9f5b8f86
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()); 171 172 mirror::ArtField* priorityField = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority); 173 self->SetNativePriority(priorityField->GetInt(self->tlsPtr_.opeer)); 174 Dbg::PostThreadStart(self); 175 176 // Invoke the 'run' method of our java.lang.Thread. 177 mirror::Object* receiver = self->tlsPtr_.opeer; 178 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 179 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 180 } 181 // Detach and delete self. 182 Runtime::Current()->GetThreadList()->Unregister(self); 183 184 return nullptr; 185} 186 187Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 188 mirror::Object* thread_peer) { 189 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 190 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 191 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 192 // to stop it from going away. 193 if (kIsDebugBuild) { 194 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 195 if (result != nullptr && !result->IsSuspended()) { 196 Locks::thread_list_lock_->AssertHeld(soa.Self()); 197 } 198 } 199 return result; 200} 201 202Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 203 jobject java_thread) { 204 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 205} 206 207static size_t FixStackSize(size_t stack_size) { 208 // A stack size of zero means "use the default". 209 if (stack_size == 0) { 210 stack_size = Runtime::Current()->GetDefaultStackSize(); 211 } 212 213 // Dalvik used the bionic pthread default stack size for native threads, 214 // so include that here to support apps that expect large native stacks. 215 stack_size += 1 * MB; 216 217 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 218 if (stack_size < PTHREAD_STACK_MIN) { 219 stack_size = PTHREAD_STACK_MIN; 220 } 221 222 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 223 // It's likely that callers are trying to ensure they have at least a certain amount of 224 // stack space, so we should add our reserved space on top of what they requested, rather 225 // than implicitly take it away from them. 226 stack_size += GetStackOverflowReservedBytes(kRuntimeISA); 227 } else { 228 // If we are going to use implicit stack checks, allocate space for the protected 229 // region at the bottom of the stack. 230 stack_size += Thread::kStackOverflowImplicitCheckSize + 231 GetStackOverflowReservedBytes(kRuntimeISA); 232 } 233 234 // Some systems require the stack size to be a multiple of the system page size, so round up. 235 stack_size = RoundUp(stack_size, kPageSize); 236 237 return stack_size; 238} 239 240// Global variable to prevent the compiler optimizing away the page reads for the stack. 241byte dont_optimize_this; 242 243// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 244// overflow is detected. It is located right below the stack_begin_. 245// 246// There is a little complexity here that deserves a special mention. On some 247// architectures, the stack created using a VM_GROWSDOWN flag 248// to prevent memory being allocated when it's not needed. This flag makes the 249// kernel only allocate memory for the stack by growing down in memory. Because we 250// want to put an mprotected region far away from that at the stack top, we need 251// to make sure the pages for the stack are mapped in before we call mprotect. We do 252// this by reading every page from the stack bottom (highest address) to the stack top. 253// We then madvise this away. 254void Thread::InstallImplicitProtection() { 255 byte* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 256 byte* stack_himem = tlsPtr_.stack_end; 257 byte* stack_top = reinterpret_cast<byte*>(reinterpret_cast<uintptr_t>(&stack_himem) & 258 ~(kPageSize - 1)); // Page containing current top of stack. 259 260 // First remove the protection on the protected region as will want to read and 261 // write it. This may fail (on the first attempt when the stack is not mapped) 262 // but we ignore that. 263 UnprotectStack(); 264 265 // Map in the stack. This must be done by reading from the 266 // current stack pointer downwards as the stack may be mapped using VM_GROWSDOWN 267 // in the kernel. Any access more than a page below the current SP might cause 268 // a segv. 269 270 // Read every page from the high address to the low. 271 for (byte* p = stack_top; p >= pregion; p -= kPageSize) { 272 dont_optimize_this = *p; 273 } 274 275 VLOG(threads) << "installing stack protected region at " << std::hex << 276 static_cast<void*>(pregion) << " to " << 277 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 278 279 // Protect the bottom of the stack to prevent read/write to it. 280 ProtectStack(); 281 282 // Tell the kernel that we won't be needing these pages any more. 283 // NB. madvise will probably write zeroes into the memory (on linux it does). 284 uint32_t unwanted_size = stack_top - pregion - kPageSize; 285 madvise(pregion, unwanted_size, MADV_DONTNEED); 286} 287 288void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 289 CHECK(java_peer != nullptr); 290 Thread* self = static_cast<JNIEnvExt*>(env)->self; 291 Runtime* runtime = Runtime::Current(); 292 293 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 294 bool thread_start_during_shutdown = false; 295 { 296 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 297 if (runtime->IsShuttingDownLocked()) { 298 thread_start_during_shutdown = true; 299 } else { 300 runtime->StartThreadBirth(); 301 } 302 } 303 if (thread_start_during_shutdown) { 304 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 305 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 306 return; 307 } 308 309 Thread* child_thread = new Thread(is_daemon); 310 // Use global JNI ref to hold peer live while child thread starts. 311 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 312 stack_size = FixStackSize(stack_size); 313 314 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 315 // assign it. 316 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 317 reinterpret_cast<jlong>(child_thread)); 318 319 pthread_t new_pthread; 320 pthread_attr_t attr; 321 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 322 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 323 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 324 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 325 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 326 327 if (pthread_create_result != 0) { 328 // pthread_create(3) failed, so clean up. 329 { 330 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 331 runtime->EndThreadBirth(); 332 } 333 // Manually delete the global reference since Thread::Init will not have been run. 334 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 335 child_thread->tlsPtr_.jpeer = nullptr; 336 delete child_thread; 337 child_thread = nullptr; 338 // TODO: remove from thread group? 339 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 340 { 341 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 342 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 343 ScopedObjectAccess soa(env); 344 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 345 } 346 } 347} 348 349void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 350 // This function does all the initialization that must be run by the native thread it applies to. 351 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 352 // we can handshake with the corresponding native thread when it's ready.) Check this native 353 // thread hasn't been through here already... 354 CHECK(Thread::Current() == nullptr); 355 SetUpAlternateSignalStack(); 356 InitCpu(); 357 InitTlsEntryPoints(); 358 RemoveSuspendTrigger(); 359 InitCardTable(); 360 InitTid(); 361 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 362 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 363 tlsPtr_.pthread_self = pthread_self(); 364 CHECK(is_started_); 365 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 366 DCHECK_EQ(Thread::Current(), this); 367 368 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 369 InitStackHwm(); 370 371 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 372 thread_list->Register(this); 373} 374 375Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 376 bool create_peer) { 377 Thread* self; 378 Runtime* runtime = Runtime::Current(); 379 if (runtime == nullptr) { 380 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 381 return nullptr; 382 } 383 { 384 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 385 if (runtime->IsShuttingDownLocked()) { 386 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 387 return nullptr; 388 } else { 389 Runtime::Current()->StartThreadBirth(); 390 self = new Thread(as_daemon); 391 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 392 Runtime::Current()->EndThreadBirth(); 393 } 394 } 395 396 CHECK_NE(self->GetState(), kRunnable); 397 self->SetState(kNative); 398 399 // If we're the main thread, ClassLinker won't be created until after we're attached, 400 // so that thread needs a two-stage attach. Regular threads don't need this hack. 401 // In the compiler, all threads need this hack, because no-one's going to be getting 402 // a native peer! 403 if (create_peer) { 404 self->CreatePeer(thread_name, as_daemon, thread_group); 405 } else { 406 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 407 if (thread_name != nullptr) { 408 self->tlsPtr_.name->assign(thread_name); 409 ::art::SetThreadName(thread_name); 410 } else if (self->GetJniEnv()->check_jni) { 411 LOG(WARNING) << *Thread::Current() << " attached without supplying a name"; 412 } 413 } 414 415 { 416 ScopedObjectAccess soa(self); 417 Dbg::PostThreadStart(self); 418 } 419 420 return self; 421} 422 423void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 424 Runtime* runtime = Runtime::Current(); 425 CHECK(runtime->IsStarted()); 426 JNIEnv* env = tlsPtr_.jni_env; 427 428 if (thread_group == nullptr) { 429 thread_group = runtime->GetMainThreadGroup(); 430 } 431 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 432 if (name != nullptr && thread_name.get() == nullptr) { 433 CHECK(IsExceptionPending()); 434 return; 435 } 436 jint thread_priority = GetNativePriority(); 437 jboolean thread_is_daemon = as_daemon; 438 439 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 440 if (peer.get() == nullptr) { 441 CHECK(IsExceptionPending()); 442 return; 443 } 444 { 445 ScopedObjectAccess soa(this); 446 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 447 } 448 env->CallNonvirtualVoidMethod(peer.get(), 449 WellKnownClasses::java_lang_Thread, 450 WellKnownClasses::java_lang_Thread_init, 451 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 452 AssertNoPendingException(); 453 454 Thread* self = this; 455 DCHECK_EQ(self, Thread::Current()); 456 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 457 reinterpret_cast<jlong>(self)); 458 459 ScopedObjectAccess soa(self); 460 StackHandleScope<1> hs(self); 461 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 462 if (peer_thread_name.Get() == nullptr) { 463 // The Thread constructor should have set the Thread.name to a 464 // non-null value. However, because we can run without code 465 // available (in the compiler, in tests), we manually assign the 466 // fields the constructor should have set. 467 if (runtime->IsActiveTransaction()) { 468 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 469 } else { 470 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 471 } 472 peer_thread_name.Assign(GetThreadName(soa)); 473 } 474 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 475 if (peer_thread_name.Get() != nullptr) { 476 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 477 } 478} 479 480template<bool kTransactionActive> 481void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 482 jobject thread_name, jint thread_priority) { 483 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 484 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 485 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 486 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 487 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 488 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 489 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 490 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 491} 492 493void Thread::SetThreadName(const char* name) { 494 tlsPtr_.name->assign(name); 495 ::art::SetThreadName(name); 496 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 497} 498 499void Thread::InitStackHwm() { 500 void* read_stack_base; 501 size_t read_stack_size; 502 size_t read_guard_size; 503 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size, &read_guard_size); 504 505 // This is included in the SIGQUIT output, but it's useful here for thread debugging. 506 VLOG(threads) << StringPrintf("Native stack is at %p (%s with %s guard)", 507 read_stack_base, 508 PrettySize(read_stack_size).c_str(), 509 PrettySize(read_guard_size).c_str()); 510 511 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 512 tlsPtr_.stack_size = read_stack_size; 513 514 // The minimum stack size we can cope with is the overflow reserved bytes (typically 515 // 8K) + the protected region size (4K) + another page (4K). Typically this will 516 // be 8+4+4 = 16K. The thread won't be able to do much with this stack even the GC takes 517 // between 8K and 12K. 518 uint32_t min_stack = GetStackOverflowReservedBytes(kRuntimeISA) + kStackOverflowProtectedSize 519 + 4 * KB; 520 if (read_stack_size <= min_stack) { 521 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 522 << " bytes)"; 523 } 524 525 // TODO: move this into the Linux GetThreadStack implementation. 526#if !defined(__APPLE__) 527 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 528 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 529 // will be broken because we'll die long before we get close to 2GB. 530 bool is_main_thread = (::art::GetTid() == getpid()); 531 if (is_main_thread) { 532 rlimit stack_limit; 533 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 534 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 535 } 536 if (stack_limit.rlim_cur == RLIM_INFINITY) { 537 // Find the default stack size for new threads... 538 pthread_attr_t default_attributes; 539 size_t default_stack_size; 540 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 541 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 542 "default stack size query"); 543 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 544 545 // ...and use that as our limit. 546 size_t old_stack_size = read_stack_size; 547 tlsPtr_.stack_size = default_stack_size; 548 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 549 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 550 << " to " << PrettySize(default_stack_size) 551 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 552 } 553 } 554#endif 555 556 // Set stack_end_ to the bottom of the stack saving space of stack overflows 557 558 Runtime* runtime = Runtime::Current(); 559 bool implicit_stack_check = !runtime->ExplicitStackOverflowChecks() && !runtime->IsCompiler(); 560 ResetDefaultStackEnd(); 561 562 // Install the protected region if we are doing implicit overflow checks. 563 if (implicit_stack_check) { 564 // The thread might have protected region at the bottom. We need 565 // to install our own region so we need to move the limits 566 // of the stack to make room for it. 567 568 tlsPtr_.stack_begin += read_guard_size + kStackOverflowProtectedSize; 569 tlsPtr_.stack_end += read_guard_size + kStackOverflowProtectedSize; 570 tlsPtr_.stack_size -= read_guard_size; 571 572 InstallImplicitProtection(); 573 } 574 575 // Sanity check. 576 int stack_variable; 577 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 578} 579 580void Thread::ShortDump(std::ostream& os) const { 581 os << "Thread["; 582 if (GetThreadId() != 0) { 583 // If we're in kStarting, we won't have a thin lock id or tid yet. 584 os << GetThreadId() 585 << ",tid=" << GetTid() << ','; 586 } 587 os << GetState() 588 << ",Thread*=" << this 589 << ",peer=" << tlsPtr_.opeer 590 << ",\"" << *tlsPtr_.name << "\"" 591 << "]"; 592} 593 594void Thread::Dump(std::ostream& os) const { 595 DumpState(os); 596 DumpStack(os); 597} 598 599mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 600 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 601 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 602} 603 604void Thread::GetThreadName(std::string& name) const { 605 name.assign(*tlsPtr_.name); 606} 607 608uint64_t Thread::GetCpuMicroTime() const { 609#if defined(HAVE_POSIX_CLOCKS) 610 clockid_t cpu_clock_id; 611 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 612 timespec now; 613 clock_gettime(cpu_clock_id, &now); 614 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 615#else 616 UNIMPLEMENTED(WARNING); 617 return -1; 618#endif 619} 620 621// Attempt to rectify locks so that we dump thread list with required locks before exiting. 622static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 623 LOG(ERROR) << *thread << " suspend count already zero."; 624 Locks::thread_suspend_count_lock_->Unlock(self); 625 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 626 Locks::mutator_lock_->SharedTryLock(self); 627 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 628 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 629 } 630 } 631 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 632 Locks::thread_list_lock_->TryLock(self); 633 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 634 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 635 } 636 } 637 std::ostringstream ss; 638 Runtime::Current()->GetThreadList()->DumpLocked(ss); 639 LOG(FATAL) << ss.str(); 640} 641 642void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 643 if (kIsDebugBuild) { 644 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 645 << delta << " " << tls32_.debug_suspend_count << " " << this; 646 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 647 Locks::thread_suspend_count_lock_->AssertHeld(self); 648 if (this != self && !IsSuspended()) { 649 Locks::thread_list_lock_->AssertHeld(self); 650 } 651 } 652 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 653 UnsafeLogFatalForSuspendCount(self, this); 654 return; 655 } 656 657 tls32_.suspend_count += delta; 658 if (for_debugger) { 659 tls32_.debug_suspend_count += delta; 660 } 661 662 if (tls32_.suspend_count == 0) { 663 AtomicClearFlag(kSuspendRequest); 664 } else { 665 AtomicSetFlag(kSuspendRequest); 666 TriggerSuspend(); 667 } 668} 669 670void Thread::RunCheckpointFunction() { 671 Closure *checkpoints[kMaxCheckpoints]; 672 673 // Grab the suspend_count lock and copy the current set of 674 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 675 // function will also grab this lock so we prevent a race between setting 676 // the kCheckpointRequest flag and clearing it. 677 { 678 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 679 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 680 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 681 tlsPtr_.checkpoint_functions[i] = nullptr; 682 } 683 AtomicClearFlag(kCheckpointRequest); 684 } 685 686 // Outside the lock, run all the checkpoint functions that 687 // we collected. 688 bool found_checkpoint = false; 689 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 690 if (checkpoints[i] != nullptr) { 691 ATRACE_BEGIN("Checkpoint function"); 692 checkpoints[i]->Run(this); 693 ATRACE_END(); 694 found_checkpoint = true; 695 } 696 } 697 CHECK(found_checkpoint); 698} 699 700bool Thread::RequestCheckpoint(Closure* function) { 701 union StateAndFlags old_state_and_flags; 702 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 703 if (old_state_and_flags.as_struct.state != kRunnable) { 704 return false; // Fail, thread is suspended and so can't run a checkpoint. 705 } 706 707 uint32_t available_checkpoint = kMaxCheckpoints; 708 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 709 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 710 available_checkpoint = i; 711 break; 712 } 713 } 714 if (available_checkpoint == kMaxCheckpoints) { 715 // No checkpoint functions available, we can't run a checkpoint 716 return false; 717 } 718 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 719 720 // Checkpoint function installed now install flag bit. 721 // We must be runnable to request a checkpoint. 722 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 723 union StateAndFlags new_state_and_flags; 724 new_state_and_flags.as_int = old_state_and_flags.as_int; 725 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 726 bool success = 727 tls32_.state_and_flags.as_atomic_int.CompareExchangeStrongSequentiallyConsistent(old_state_and_flags.as_int, 728 new_state_and_flags.as_int); 729 if (UNLIKELY(!success)) { 730 // The thread changed state before the checkpoint was installed. 731 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 732 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 733 } else { 734 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 735 TriggerSuspend(); 736 } 737 return success; 738} 739 740void Thread::FullSuspendCheck() { 741 VLOG(threads) << this << " self-suspending"; 742 ATRACE_BEGIN("Full suspend check"); 743 // Make thread appear suspended to other threads, release mutator_lock_. 744 TransitionFromRunnableToSuspended(kSuspended); 745 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 746 TransitionFromSuspendedToRunnable(); 747 ATRACE_END(); 748 VLOG(threads) << this << " self-reviving"; 749} 750 751void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 752 std::string group_name; 753 int priority; 754 bool is_daemon = false; 755 Thread* self = Thread::Current(); 756 757 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 758 // cause ScopedObjectAccessUnchecked to deadlock. 759 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 760 ScopedObjectAccessUnchecked soa(self); 761 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 762 ->GetInt(thread->tlsPtr_.opeer); 763 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 764 ->GetBoolean(thread->tlsPtr_.opeer); 765 766 mirror::Object* thread_group = 767 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 768 769 if (thread_group != nullptr) { 770 mirror::ArtField* group_name_field = 771 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 772 mirror::String* group_name_string = 773 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 774 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 775 } 776 } else { 777 priority = GetNativePriority(); 778 } 779 780 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 781 if (scheduler_group_name.empty()) { 782 scheduler_group_name = "default"; 783 } 784 785 if (thread != nullptr) { 786 os << '"' << *thread->tlsPtr_.name << '"'; 787 if (is_daemon) { 788 os << " daemon"; 789 } 790 os << " prio=" << priority 791 << " tid=" << thread->GetThreadId() 792 << " " << thread->GetState(); 793 if (thread->IsStillStarting()) { 794 os << " (still starting up)"; 795 } 796 os << "\n"; 797 } else { 798 os << '"' << ::art::GetThreadName(tid) << '"' 799 << " prio=" << priority 800 << " (not attached)\n"; 801 } 802 803 if (thread != nullptr) { 804 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 805 os << " | group=\"" << group_name << "\"" 806 << " sCount=" << thread->tls32_.suspend_count 807 << " dsCount=" << thread->tls32_.debug_suspend_count 808 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 809 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 810 } 811 812 os << " | sysTid=" << tid 813 << " nice=" << getpriority(PRIO_PROCESS, tid) 814 << " cgrp=" << scheduler_group_name; 815 if (thread != nullptr) { 816 int policy; 817 sched_param sp; 818 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 819 __FUNCTION__); 820 os << " sched=" << policy << "/" << sp.sched_priority 821 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 822 } 823 os << "\n"; 824 825 // Grab the scheduler stats for this thread. 826 std::string scheduler_stats; 827 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 828 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 829 } else { 830 scheduler_stats = "0 0 0"; 831 } 832 833 char native_thread_state = '?'; 834 int utime = 0; 835 int stime = 0; 836 int task_cpu = 0; 837 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 838 839 os << " | state=" << native_thread_state 840 << " schedstat=( " << scheduler_stats << " )" 841 << " utm=" << utime 842 << " stm=" << stime 843 << " core=" << task_cpu 844 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 845 if (thread != nullptr) { 846 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 847 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 848 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 849 // Dump the held mutexes. 850 os << " | held mutexes="; 851 for (size_t i = 0; i < kLockLevelCount; ++i) { 852 if (i != kMonitorLock) { 853 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 854 if (mutex != nullptr) { 855 os << " \"" << mutex->GetName() << "\""; 856 if (mutex->IsReaderWriterMutex()) { 857 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 858 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 859 os << "(exclusive held)"; 860 } else { 861 os << "(shared held)"; 862 } 863 } 864 } 865 } 866 } 867 os << "\n"; 868 } 869} 870 871void Thread::DumpState(std::ostream& os) const { 872 Thread::DumpState(os, this, GetTid()); 873} 874 875struct StackDumpVisitor : public StackVisitor { 876 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 877 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 878 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 879 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 880 } 881 882 virtual ~StackDumpVisitor() { 883 if (frame_count == 0) { 884 os << " (no managed stack frames)\n"; 885 } 886 } 887 888 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 889 mirror::ArtMethod* m = GetMethod(); 890 if (m->IsRuntimeMethod()) { 891 return true; 892 } 893 const int kMaxRepetition = 3; 894 mirror::Class* c = m->GetDeclaringClass(); 895 mirror::DexCache* dex_cache = c->GetDexCache(); 896 int line_number = -1; 897 if (dex_cache != nullptr) { // be tolerant of bad input 898 const DexFile& dex_file = *dex_cache->GetDexFile(); 899 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 900 } 901 if (line_number == last_line_number && last_method == m) { 902 ++repetition_count; 903 } else { 904 if (repetition_count >= kMaxRepetition) { 905 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 906 } 907 repetition_count = 0; 908 last_line_number = line_number; 909 last_method = m; 910 } 911 if (repetition_count < kMaxRepetition) { 912 os << " at " << PrettyMethod(m, false); 913 if (m->IsNative()) { 914 os << "(Native method)"; 915 } else { 916 const char* source_file(m->GetDeclaringClassSourceFile()); 917 os << "(" << (source_file != nullptr ? source_file : "unavailable") 918 << ":" << line_number << ")"; 919 } 920 os << "\n"; 921 if (frame_count == 0) { 922 Monitor::DescribeWait(os, thread); 923 } 924 if (can_allocate) { 925 // Visit locks, but do not abort on errors. This would trigger a nested abort. 926 Monitor::VisitLocks(this, DumpLockedObject, &os, false); 927 } 928 } 929 930 ++frame_count; 931 return true; 932 } 933 934 static void DumpLockedObject(mirror::Object* o, void* context) 935 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 936 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 937 os << " - locked "; 938 if (o == nullptr) { 939 os << "an unknown object"; 940 } else { 941 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 942 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 943 // Getting the identity hashcode here would result in lock inflation and suspension of the 944 // current thread, which isn't safe if this is the only runnable thread. 945 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 946 PrettyTypeOf(o).c_str()); 947 } else { 948 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 949 } 950 } 951 os << "\n"; 952 } 953 954 std::ostream& os; 955 const Thread* thread; 956 const bool can_allocate; 957 mirror::ArtMethod* last_method; 958 int last_line_number; 959 int repetition_count; 960 int frame_count; 961}; 962 963static bool ShouldShowNativeStack(const Thread* thread) 964 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 965 ThreadState state = thread->GetState(); 966 967 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 968 if (state > kWaiting && state < kStarting) { 969 return true; 970 } 971 972 // In an Object.wait variant or Thread.sleep? That's not interesting. 973 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 974 return false; 975 } 976 977 // Threads with no managed stack frames should be shown. 978 const ManagedStack* managed_stack = thread->GetManagedStack(); 979 if (managed_stack == NULL || (managed_stack->GetTopQuickFrame() == NULL && 980 managed_stack->GetTopShadowFrame() == NULL)) { 981 return true; 982 } 983 984 // In some other native method? That's interesting. 985 // We don't just check kNative because native methods will be in state kSuspended if they're 986 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 987 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 988 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 989 return current_method != nullptr && current_method->IsNative(); 990} 991 992void Thread::DumpJavaStack(std::ostream& os) const { 993 // Dumping the Java stack involves the verifier for locks. The verifier operates under the 994 // assumption that there is no exception pending on entry. Thus, stash any pending exception. 995 // TODO: Find a way to avoid const_cast. 996 StackHandleScope<3> scope(const_cast<Thread*>(this)); 997 Handle<mirror::Throwable> exc; 998 Handle<mirror::Object> throw_location_this_object; 999 Handle<mirror::ArtMethod> throw_location_method; 1000 uint32_t throw_location_dex_pc; 1001 bool have_exception = false; 1002 if (IsExceptionPending()) { 1003 ThrowLocation exc_location; 1004 exc = scope.NewHandle(GetException(&exc_location)); 1005 throw_location_this_object = scope.NewHandle(exc_location.GetThis()); 1006 throw_location_method = scope.NewHandle(exc_location.GetMethod()); 1007 throw_location_dex_pc = exc_location.GetDexPc(); 1008 const_cast<Thread*>(this)->ClearException(); 1009 have_exception = true; 1010 } 1011 1012 std::unique_ptr<Context> context(Context::Create()); 1013 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 1014 !tls32_.throwing_OutOfMemoryError); 1015 dumper.WalkStack(); 1016 1017 if (have_exception) { 1018 ThrowLocation exc_location(throw_location_this_object.Get(), 1019 throw_location_method.Get(), 1020 throw_location_dex_pc); 1021 const_cast<Thread*>(this)->SetException(exc_location, exc.Get()); 1022 } 1023} 1024 1025void Thread::DumpStack(std::ostream& os) const { 1026 // TODO: we call this code when dying but may not have suspended the thread ourself. The 1027 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 1028 // the race with the thread_suspend_count_lock_). 1029 bool dump_for_abort = (gAborting > 0); 1030 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 1031 if (!kIsDebugBuild) { 1032 // We always want to dump the stack for an abort, however, there is no point dumping another 1033 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 1034 safe_to_dump = (safe_to_dump || dump_for_abort); 1035 } 1036 if (safe_to_dump) { 1037 // If we're currently in native code, dump that stack before dumping the managed stack. 1038 if (dump_for_abort || ShouldShowNativeStack(this)) { 1039#ifndef NO_DUMP_NATIVE_STACKS 1040 DumpKernelStack(os, GetTid(), " kernel: ", false); 1041 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr, !dump_for_abort)); 1042#endif 1043 } 1044 DumpJavaStack(os); 1045 } else { 1046 os << "Not able to dump stack of thread that isn't suspended"; 1047 } 1048} 1049 1050void Thread::ThreadExitCallback(void* arg) { 1051 Thread* self = reinterpret_cast<Thread*>(arg); 1052 if (self->tls32_.thread_exit_check_count == 0) { 1053 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1054 "going to use a pthread_key_create destructor?): " << *self; 1055 CHECK(is_started_); 1056 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1057 self->tls32_.thread_exit_check_count = 1; 1058 } else { 1059 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1060 } 1061} 1062 1063void Thread::Startup() { 1064 CHECK(!is_started_); 1065 is_started_ = true; 1066 { 1067 // MutexLock to keep annotalysis happy. 1068 // 1069 // Note we use nullptr for the thread because Thread::Current can 1070 // return garbage since (is_started_ == true) and 1071 // Thread::pthread_key_self_ is not yet initialized. 1072 // This was seen on glibc. 1073 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1074 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1075 *Locks::thread_suspend_count_lock_); 1076 } 1077 1078 // Allocate a TLS slot. 1079 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1080 1081 // Double-check the TLS slot allocation. 1082 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1083 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1084 } 1085} 1086 1087void Thread::FinishStartup() { 1088 Runtime* runtime = Runtime::Current(); 1089 CHECK(runtime->IsStarted()); 1090 1091 // Finish attaching the main thread. 1092 ScopedObjectAccess soa(Thread::Current()); 1093 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1094 1095 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1096} 1097 1098void Thread::Shutdown() { 1099 CHECK(is_started_); 1100 is_started_ = false; 1101 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1102 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1103 if (resume_cond_ != nullptr) { 1104 delete resume_cond_; 1105 resume_cond_ = nullptr; 1106 } 1107} 1108 1109Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1110 wait_mutex_ = new Mutex("a thread wait mutex"); 1111 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1112 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1113 tlsPtr_.single_step_control = new SingleStepControl; 1114 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1115 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 1116 tlsPtr_.nested_signal_state = static_cast<jmp_buf*>(malloc(sizeof(jmp_buf))); 1117 1118 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 1119 tls32_.state_and_flags.as_struct.flags = 0; 1120 tls32_.state_and_flags.as_struct.state = kNative; 1121 memset(&tlsPtr_.held_mutexes[0], 0, sizeof(tlsPtr_.held_mutexes)); 1122 std::fill(tlsPtr_.rosalloc_runs, 1123 tlsPtr_.rosalloc_runs + kNumRosAllocThreadLocalSizeBrackets, 1124 gc::allocator::RosAlloc::GetDedicatedFullRun()); 1125 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 1126 tlsPtr_.checkpoint_functions[i] = nullptr; 1127 } 1128} 1129 1130bool Thread::IsStillStarting() const { 1131 // You might think you can check whether the state is kStarting, but for much of thread startup, 1132 // the thread is in kNative; it might also be in kVmWait. 1133 // You might think you can check whether the peer is nullptr, but the peer is actually created and 1134 // assigned fairly early on, and needs to be. 1135 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 1136 // this thread _ever_ entered kRunnable". 1137 return (tlsPtr_.jpeer == nullptr && tlsPtr_.opeer == nullptr) || 1138 (*tlsPtr_.name == kThreadNameDuringStartup); 1139} 1140 1141void Thread::AssertNoPendingException() const { 1142 if (UNLIKELY(IsExceptionPending())) { 1143 ScopedObjectAccess soa(Thread::Current()); 1144 mirror::Throwable* exception = GetException(nullptr); 1145 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 1146 } 1147} 1148 1149void Thread::AssertNoPendingExceptionForNewException(const char* msg) const { 1150 if (UNLIKELY(IsExceptionPending())) { 1151 ScopedObjectAccess soa(Thread::Current()); 1152 mirror::Throwable* exception = GetException(nullptr); 1153 LOG(FATAL) << "Throwing new exception '" << msg << "' with unexpected pending exception: " 1154 << exception->Dump(); 1155 } 1156} 1157 1158static void MonitorExitVisitor(mirror::Object** object, void* arg, const RootInfo& /*root_info*/) 1159 NO_THREAD_SAFETY_ANALYSIS { 1160 Thread* self = reinterpret_cast<Thread*>(arg); 1161 mirror::Object* entered_monitor = *object; 1162 if (self->HoldsLock(entered_monitor)) { 1163 LOG(WARNING) << "Calling MonitorExit on object " 1164 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1165 << " left locked by native thread " 1166 << *Thread::Current() << " which is detaching"; 1167 entered_monitor->MonitorExit(self); 1168 } 1169} 1170 1171void Thread::Destroy() { 1172 Thread* self = this; 1173 DCHECK_EQ(self, Thread::Current()); 1174 1175 if (tlsPtr_.opeer != nullptr) { 1176 ScopedObjectAccess soa(self); 1177 // We may need to call user-supplied managed code, do this before final clean-up. 1178 HandleUncaughtExceptions(soa); 1179 RemoveFromThreadGroup(soa); 1180 1181 // this.nativePeer = 0; 1182 if (Runtime::Current()->IsActiveTransaction()) { 1183 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1184 ->SetLong<true>(tlsPtr_.opeer, 0); 1185 } else { 1186 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1187 ->SetLong<false>(tlsPtr_.opeer, 0); 1188 } 1189 Dbg::PostThreadDeath(self); 1190 1191 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1192 // who is waiting. 1193 mirror::Object* lock = 1194 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1195 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1196 if (lock != nullptr) { 1197 StackHandleScope<1> hs(self); 1198 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1199 ObjectLock<mirror::Object> locker(self, h_obj); 1200 locker.NotifyAll(); 1201 } 1202 } 1203 1204 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1205 if (tlsPtr_.jni_env != nullptr) { 1206 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, RootInfo(kRootVMInternal)); 1207 } 1208} 1209 1210Thread::~Thread() { 1211 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1212 // If pthread_create fails we don't have a jni env here. 1213 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1214 tlsPtr_.jpeer = nullptr; 1215 } 1216 tlsPtr_.opeer = nullptr; 1217 1218 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1219 if (initialized) { 1220 delete tlsPtr_.jni_env; 1221 tlsPtr_.jni_env = nullptr; 1222 } 1223 CHECK_NE(GetState(), kRunnable); 1224 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1225 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1226 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1227 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1228 1229 // We may be deleting a still born thread. 1230 SetStateUnsafe(kTerminated); 1231 1232 delete wait_cond_; 1233 delete wait_mutex_; 1234 1235 if (tlsPtr_.long_jump_context != nullptr) { 1236 delete tlsPtr_.long_jump_context; 1237 } 1238 1239 if (initialized) { 1240 CleanupCpu(); 1241 } 1242 1243 delete tlsPtr_.debug_invoke_req; 1244 delete tlsPtr_.single_step_control; 1245 delete tlsPtr_.instrumentation_stack; 1246 delete tlsPtr_.name; 1247 delete tlsPtr_.stack_trace_sample; 1248 free(tlsPtr_.nested_signal_state); 1249 1250 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1251 1252 TearDownAlternateSignalStack(); 1253} 1254 1255void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1256 if (!IsExceptionPending()) { 1257 return; 1258 } 1259 ScopedLocalRef<jobject> peer(tlsPtr_.jni_env, soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1260 ScopedThreadStateChange tsc(this, kNative); 1261 1262 // Get and clear the exception. 1263 ScopedLocalRef<jthrowable> exception(tlsPtr_.jni_env, tlsPtr_.jni_env->ExceptionOccurred()); 1264 tlsPtr_.jni_env->ExceptionClear(); 1265 1266 // If the thread has its own handler, use that. 1267 ScopedLocalRef<jobject> handler(tlsPtr_.jni_env, 1268 tlsPtr_.jni_env->GetObjectField(peer.get(), 1269 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1270 if (handler.get() == nullptr) { 1271 // Otherwise use the thread group's default handler. 1272 handler.reset(tlsPtr_.jni_env->GetObjectField(peer.get(), 1273 WellKnownClasses::java_lang_Thread_group)); 1274 } 1275 1276 // Call the handler. 1277 tlsPtr_.jni_env->CallVoidMethod(handler.get(), 1278 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1279 peer.get(), exception.get()); 1280 1281 // If the handler threw, clear that exception too. 1282 tlsPtr_.jni_env->ExceptionClear(); 1283} 1284 1285void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1286 // this.group.removeThread(this); 1287 // group can be null if we're in the compiler or a test. 1288 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group) 1289 ->GetObject(tlsPtr_.opeer); 1290 if (ogroup != nullptr) { 1291 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1292 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(tlsPtr_.opeer)); 1293 ScopedThreadStateChange tsc(soa.Self(), kNative); 1294 tlsPtr_.jni_env->CallVoidMethod(group.get(), 1295 WellKnownClasses::java_lang_ThreadGroup_removeThread, 1296 peer.get()); 1297 } 1298} 1299 1300size_t Thread::NumHandleReferences() { 1301 size_t count = 0; 1302 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1303 count += cur->NumberOfReferences(); 1304 } 1305 return count; 1306} 1307 1308bool Thread::HandleScopeContains(jobject obj) const { 1309 StackReference<mirror::Object>* hs_entry = 1310 reinterpret_cast<StackReference<mirror::Object>*>(obj); 1311 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1312 if (cur->Contains(hs_entry)) { 1313 return true; 1314 } 1315 } 1316 // JNI code invoked from portable code uses shadow frames rather than the handle scope. 1317 return tlsPtr_.managed_stack.ShadowFramesContain(hs_entry); 1318} 1319 1320void Thread::HandleScopeVisitRoots(RootCallback* visitor, void* arg, uint32_t thread_id) { 1321 for (HandleScope* cur = tlsPtr_.top_handle_scope; cur; cur = cur->GetLink()) { 1322 size_t num_refs = cur->NumberOfReferences(); 1323 for (size_t j = 0; j < num_refs; ++j) { 1324 mirror::Object* object = cur->GetReference(j); 1325 if (object != nullptr) { 1326 mirror::Object* old_obj = object; 1327 visitor(&object, arg, RootInfo(kRootNativeStack, thread_id)); 1328 if (old_obj != object) { 1329 cur->SetReference(j, object); 1330 } 1331 } 1332 } 1333 } 1334} 1335 1336mirror::Object* Thread::DecodeJObject(jobject obj) const { 1337 Locks::mutator_lock_->AssertSharedHeld(this); 1338 if (obj == nullptr) { 1339 return nullptr; 1340 } 1341 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1342 IndirectRefKind kind = GetIndirectRefKind(ref); 1343 mirror::Object* result; 1344 // The "kinds" below are sorted by the frequency we expect to encounter them. 1345 if (kind == kLocal) { 1346 IndirectReferenceTable& locals = tlsPtr_.jni_env->locals; 1347 // Local references do not need a read barrier. 1348 result = locals.Get<kWithoutReadBarrier>(ref); 1349 } else if (kind == kHandleScopeOrInvalid) { 1350 // TODO: make stack indirect reference table lookup more efficient. 1351 // Check if this is a local reference in the handle scope. 1352 if (LIKELY(HandleScopeContains(obj))) { 1353 // Read from handle scope. 1354 result = reinterpret_cast<StackReference<mirror::Object>*>(obj)->AsMirrorPtr(); 1355 VerifyObject(result); 1356 } else { 1357 result = kInvalidIndirectRefObject; 1358 } 1359 } else if (kind == kGlobal) { 1360 JavaVMExt* const vm = Runtime::Current()->GetJavaVM(); 1361 result = vm->globals.SynchronizedGet(const_cast<Thread*>(this), &vm->globals_lock, ref); 1362 } else { 1363 DCHECK_EQ(kind, kWeakGlobal); 1364 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1365 if (result == kClearedJniWeakGlobal) { 1366 // This is a special case where it's okay to return nullptr. 1367 return nullptr; 1368 } 1369 } 1370 1371 if (UNLIKELY(result == nullptr)) { 1372 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1373 } 1374 return result; 1375} 1376 1377// Implements java.lang.Thread.interrupted. 1378bool Thread::Interrupted() { 1379 MutexLock mu(Thread::Current(), *wait_mutex_); 1380 bool interrupted = IsInterruptedLocked(); 1381 SetInterruptedLocked(false); 1382 return interrupted; 1383} 1384 1385// Implements java.lang.Thread.isInterrupted. 1386bool Thread::IsInterrupted() { 1387 MutexLock mu(Thread::Current(), *wait_mutex_); 1388 return IsInterruptedLocked(); 1389} 1390 1391void Thread::Interrupt(Thread* self) { 1392 MutexLock mu(self, *wait_mutex_); 1393 if (interrupted_) { 1394 return; 1395 } 1396 interrupted_ = true; 1397 NotifyLocked(self); 1398} 1399 1400void Thread::Notify() { 1401 Thread* self = Thread::Current(); 1402 MutexLock mu(self, *wait_mutex_); 1403 NotifyLocked(self); 1404} 1405 1406void Thread::NotifyLocked(Thread* self) { 1407 if (wait_monitor_ != nullptr) { 1408 wait_cond_->Signal(self); 1409 } 1410} 1411 1412class CountStackDepthVisitor : public StackVisitor { 1413 public: 1414 explicit CountStackDepthVisitor(Thread* thread) 1415 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1416 : StackVisitor(thread, nullptr), 1417 depth_(0), skip_depth_(0), skipping_(true) {} 1418 1419 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1420 // We want to skip frames up to and including the exception's constructor. 1421 // Note we also skip the frame if it doesn't have a method (namely the callee 1422 // save frame) 1423 mirror::ArtMethod* m = GetMethod(); 1424 if (skipping_ && !m->IsRuntimeMethod() && 1425 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1426 skipping_ = false; 1427 } 1428 if (!skipping_) { 1429 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1430 ++depth_; 1431 } 1432 } else { 1433 ++skip_depth_; 1434 } 1435 return true; 1436 } 1437 1438 int GetDepth() const { 1439 return depth_; 1440 } 1441 1442 int GetSkipDepth() const { 1443 return skip_depth_; 1444 } 1445 1446 private: 1447 uint32_t depth_; 1448 uint32_t skip_depth_; 1449 bool skipping_; 1450}; 1451 1452template<bool kTransactionActive> 1453class BuildInternalStackTraceVisitor : public StackVisitor { 1454 public: 1455 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1456 : StackVisitor(thread, nullptr), self_(self), 1457 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1458 1459 bool Init(int depth) 1460 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1461 // Allocate method trace with an extra slot that will hold the PC trace 1462 StackHandleScope<1> hs(self_); 1463 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1464 Handle<mirror::ObjectArray<mirror::Object>> method_trace( 1465 hs.NewHandle(class_linker->AllocObjectArray<mirror::Object>(self_, depth + 1))); 1466 if (method_trace.Get() == nullptr) { 1467 return false; 1468 } 1469 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1470 if (dex_pc_trace == nullptr) { 1471 return false; 1472 } 1473 // Save PC trace in last element of method trace, also places it into the 1474 // object graph. 1475 // We are called from native: use non-transactional mode. 1476 method_trace->Set<kTransactionActive>(depth, dex_pc_trace); 1477 // Set the Object*s and assert that no thread suspension is now possible. 1478 const char* last_no_suspend_cause = 1479 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1480 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1481 method_trace_ = method_trace.Get(); 1482 dex_pc_trace_ = dex_pc_trace; 1483 return true; 1484 } 1485 1486 virtual ~BuildInternalStackTraceVisitor() { 1487 if (method_trace_ != nullptr) { 1488 self_->EndAssertNoThreadSuspension(nullptr); 1489 } 1490 } 1491 1492 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1493 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1494 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1495 } 1496 if (skip_depth_ > 0) { 1497 skip_depth_--; 1498 return true; 1499 } 1500 mirror::ArtMethod* m = GetMethod(); 1501 if (m->IsRuntimeMethod()) { 1502 return true; // Ignore runtime frames (in particular callee save). 1503 } 1504 method_trace_->Set<kTransactionActive>(count_, m); 1505 dex_pc_trace_->Set<kTransactionActive>(count_, 1506 m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1507 ++count_; 1508 return true; 1509 } 1510 1511 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1512 return method_trace_; 1513 } 1514 1515 private: 1516 Thread* const self_; 1517 // How many more frames to skip. 1518 int32_t skip_depth_; 1519 // Current position down stack trace. 1520 uint32_t count_; 1521 // Array of dex PC values. 1522 mirror::IntArray* dex_pc_trace_; 1523 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1524 mirror::ObjectArray<mirror::Object>* method_trace_; 1525}; 1526 1527template<bool kTransactionActive> 1528jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessAlreadyRunnable& soa) const { 1529 // Compute depth of stack 1530 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1531 count_visitor.WalkStack(); 1532 int32_t depth = count_visitor.GetDepth(); 1533 int32_t skip_depth = count_visitor.GetSkipDepth(); 1534 1535 // Build internal stack trace. 1536 BuildInternalStackTraceVisitor<kTransactionActive> build_trace_visitor(soa.Self(), 1537 const_cast<Thread*>(this), 1538 skip_depth); 1539 if (!build_trace_visitor.Init(depth)) { 1540 return nullptr; // Allocation failed. 1541 } 1542 build_trace_visitor.WalkStack(); 1543 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1544 if (kIsDebugBuild) { 1545 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1546 CHECK(trace->Get(i) != nullptr); 1547 } 1548 } 1549 return soa.AddLocalReference<jobjectArray>(trace); 1550} 1551template jobject Thread::CreateInternalStackTrace<false>( 1552 const ScopedObjectAccessAlreadyRunnable& soa) const; 1553template jobject Thread::CreateInternalStackTrace<true>( 1554 const ScopedObjectAccessAlreadyRunnable& soa) const; 1555 1556jobjectArray Thread::InternalStackTraceToStackTraceElementArray( 1557 const ScopedObjectAccessAlreadyRunnable& soa, jobject internal, jobjectArray output_array, 1558 int* stack_depth) { 1559 // Decode the internal stack trace into the depth, method trace and PC trace 1560 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1561 1562 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1563 1564 jobjectArray result; 1565 1566 if (output_array != nullptr) { 1567 // Reuse the array we were given. 1568 result = output_array; 1569 // ...adjusting the number of frames we'll write to not exceed the array length. 1570 const int32_t traces_length = 1571 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1572 depth = std::min(depth, traces_length); 1573 } else { 1574 // Create java_trace array and place in local reference table 1575 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1576 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1577 if (java_traces == nullptr) { 1578 return nullptr; 1579 } 1580 result = soa.AddLocalReference<jobjectArray>(java_traces); 1581 } 1582 1583 if (stack_depth != nullptr) { 1584 *stack_depth = depth; 1585 } 1586 1587 for (int32_t i = 0; i < depth; ++i) { 1588 mirror::ObjectArray<mirror::Object>* method_trace = 1589 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1590 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1591 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1592 int32_t line_number; 1593 StackHandleScope<3> hs(soa.Self()); 1594 auto class_name_object(hs.NewHandle<mirror::String>(nullptr)); 1595 auto source_name_object(hs.NewHandle<mirror::String>(nullptr)); 1596 if (method->IsProxyMethod()) { 1597 line_number = -1; 1598 class_name_object.Assign(method->GetDeclaringClass()->GetName()); 1599 // source_name_object intentionally left null for proxy methods 1600 } else { 1601 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1602 uint32_t dex_pc = pc_trace->Get(i); 1603 line_number = method->GetLineNumFromDexPC(dex_pc); 1604 // Allocate element, potentially triggering GC 1605 // TODO: reuse class_name_object via Class::name_? 1606 const char* descriptor = method->GetDeclaringClassDescriptor(); 1607 CHECK(descriptor != nullptr); 1608 std::string class_name(PrettyDescriptor(descriptor)); 1609 class_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1610 if (class_name_object.Get() == nullptr) { 1611 return nullptr; 1612 } 1613 const char* source_file = method->GetDeclaringClassSourceFile(); 1614 if (source_file != nullptr) { 1615 source_name_object.Assign(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1616 if (source_name_object.Get() == nullptr) { 1617 return nullptr; 1618 } 1619 } 1620 } 1621 const char* method_name = method->GetName(); 1622 CHECK(method_name != nullptr); 1623 Handle<mirror::String> method_name_object( 1624 hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), method_name))); 1625 if (method_name_object.Get() == nullptr) { 1626 return nullptr; 1627 } 1628 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1629 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1630 if (obj == nullptr) { 1631 return nullptr; 1632 } 1633 // We are called from native: use non-transactional mode. 1634 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set<false>(i, obj); 1635 } 1636 return result; 1637} 1638 1639void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1640 const char* exception_class_descriptor, const char* fmt, ...) { 1641 va_list args; 1642 va_start(args, fmt); 1643 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1644 fmt, args); 1645 va_end(args); 1646} 1647 1648void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1649 const char* exception_class_descriptor, 1650 const char* fmt, va_list ap) { 1651 std::string msg; 1652 StringAppendV(&msg, fmt, ap); 1653 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1654} 1655 1656void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1657 const char* msg) { 1658 // Callers should either clear or call ThrowNewWrappedException. 1659 AssertNoPendingExceptionForNewException(msg); 1660 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1661} 1662 1663void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1664 const char* exception_class_descriptor, 1665 const char* msg) { 1666 DCHECK_EQ(this, Thread::Current()); 1667 ScopedObjectAccessUnchecked soa(this); 1668 StackHandleScope<5> hs(soa.Self()); 1669 // Ensure we don't forget arguments over object allocation. 1670 Handle<mirror::Object> saved_throw_this(hs.NewHandle(throw_location.GetThis())); 1671 Handle<mirror::ArtMethod> saved_throw_method(hs.NewHandle(throw_location.GetMethod())); 1672 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1673 ScopedLocalRef<jobject> cause(GetJniEnv(), soa.AddLocalReference<jobject>(GetException(nullptr))); 1674 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1675 ClearException(); 1676 Runtime* runtime = Runtime::Current(); 1677 1678 mirror::ClassLoader* cl = nullptr; 1679 if (saved_throw_method.Get() != nullptr) { 1680 cl = saved_throw_method.Get()->GetDeclaringClass()->GetClassLoader(); 1681 } 1682 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(cl)); 1683 Handle<mirror::Class> exception_class( 1684 hs.NewHandle(runtime->GetClassLinker()->FindClass(this, exception_class_descriptor, 1685 class_loader))); 1686 if (UNLIKELY(exception_class.Get() == nullptr)) { 1687 CHECK(IsExceptionPending()); 1688 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1689 return; 1690 } 1691 1692 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1693 DCHECK(IsExceptionPending()); 1694 return; 1695 } 1696 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1697 Handle<mirror::Throwable> exception( 1698 hs.NewHandle(down_cast<mirror::Throwable*>(exception_class->AllocObject(this)))); 1699 1700 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1701 if (exception.Get() == nullptr) { 1702 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1703 throw_location.GetDexPc()); 1704 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1705 SetExceptionReportedToInstrumentation(is_exception_reported); 1706 return; 1707 } 1708 1709 // Choose an appropriate constructor and set up the arguments. 1710 const char* signature; 1711 ScopedLocalRef<jstring> msg_string(GetJniEnv(), nullptr); 1712 if (msg != nullptr) { 1713 // Ensure we remember this and the method over the String allocation. 1714 msg_string.reset( 1715 soa.AddLocalReference<jstring>(mirror::String::AllocFromModifiedUtf8(this, msg))); 1716 if (UNLIKELY(msg_string.get() == nullptr)) { 1717 CHECK(IsExceptionPending()); // OOME. 1718 return; 1719 } 1720 if (cause.get() == nullptr) { 1721 signature = "(Ljava/lang/String;)V"; 1722 } else { 1723 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1724 } 1725 } else { 1726 if (cause.get() == nullptr) { 1727 signature = "()V"; 1728 } else { 1729 signature = "(Ljava/lang/Throwable;)V"; 1730 } 1731 } 1732 mirror::ArtMethod* exception_init_method = 1733 exception_class->FindDeclaredDirectMethod("<init>", signature); 1734 1735 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1736 << PrettyDescriptor(exception_class_descriptor); 1737 1738 if (UNLIKELY(!runtime->IsStarted())) { 1739 // Something is trying to throw an exception without a started runtime, which is the common 1740 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1741 // the exception fields directly. 1742 if (msg != nullptr) { 1743 exception->SetDetailMessage(down_cast<mirror::String*>(DecodeJObject(msg_string.get()))); 1744 } 1745 if (cause.get() != nullptr) { 1746 exception->SetCause(down_cast<mirror::Throwable*>(DecodeJObject(cause.get()))); 1747 } 1748 ScopedLocalRef<jobject> trace(GetJniEnv(), 1749 Runtime::Current()->IsActiveTransaction() 1750 ? CreateInternalStackTrace<true>(soa) 1751 : CreateInternalStackTrace<false>(soa)); 1752 if (trace.get() != nullptr) { 1753 exception->SetStackState(down_cast<mirror::Throwable*>(DecodeJObject(trace.get()))); 1754 } 1755 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1756 throw_location.GetDexPc()); 1757 SetException(gc_safe_throw_location, exception.Get()); 1758 SetExceptionReportedToInstrumentation(is_exception_reported); 1759 } else { 1760 jvalue jv_args[2]; 1761 size_t i = 0; 1762 1763 if (msg != nullptr) { 1764 jv_args[i].l = msg_string.get(); 1765 ++i; 1766 } 1767 if (cause.get() != nullptr) { 1768 jv_args[i].l = cause.get(); 1769 ++i; 1770 } 1771 InvokeWithJValues(soa, exception.Get(), soa.EncodeMethod(exception_init_method), jv_args); 1772 if (LIKELY(!IsExceptionPending())) { 1773 ThrowLocation gc_safe_throw_location(saved_throw_this.Get(), saved_throw_method.Get(), 1774 throw_location.GetDexPc()); 1775 SetException(gc_safe_throw_location, exception.Get()); 1776 SetExceptionReportedToInstrumentation(is_exception_reported); 1777 } 1778 } 1779} 1780 1781void Thread::ThrowOutOfMemoryError(const char* msg) { 1782 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1783 msg, (tls32_.throwing_OutOfMemoryError ? " (recursive case)" : "")); 1784 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1785 if (!tls32_.throwing_OutOfMemoryError) { 1786 tls32_.throwing_OutOfMemoryError = true; 1787 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1788 tls32_.throwing_OutOfMemoryError = false; 1789 } else { 1790 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1791 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1792 } 1793} 1794 1795Thread* Thread::CurrentFromGdb() { 1796 return Thread::Current(); 1797} 1798 1799void Thread::DumpFromGdb() const { 1800 std::ostringstream ss; 1801 Dump(ss); 1802 std::string str(ss.str()); 1803 // log to stderr for debugging command line processes 1804 std::cerr << str; 1805#ifdef HAVE_ANDROID_OS 1806 // log to logcat for debugging frameworks processes 1807 LOG(INFO) << str; 1808#endif 1809} 1810 1811// Explicitly instantiate 32 and 64bit thread offset dumping support. 1812template void Thread::DumpThreadOffset<4>(std::ostream& os, uint32_t offset); 1813template void Thread::DumpThreadOffset<8>(std::ostream& os, uint32_t offset); 1814 1815template<size_t ptr_size> 1816void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset) { 1817#define DO_THREAD_OFFSET(x, y) \ 1818 if (offset == x.Uint32Value()) { \ 1819 os << y; \ 1820 return; \ 1821 } 1822 DO_THREAD_OFFSET(ThreadFlagsOffset<ptr_size>(), "state_and_flags") 1823 DO_THREAD_OFFSET(CardTableOffset<ptr_size>(), "card_table") 1824 DO_THREAD_OFFSET(ExceptionOffset<ptr_size>(), "exception") 1825 DO_THREAD_OFFSET(PeerOffset<ptr_size>(), "peer"); 1826 DO_THREAD_OFFSET(JniEnvOffset<ptr_size>(), "jni_env") 1827 DO_THREAD_OFFSET(SelfOffset<ptr_size>(), "self") 1828 DO_THREAD_OFFSET(StackEndOffset<ptr_size>(), "stack_end") 1829 DO_THREAD_OFFSET(ThinLockIdOffset<ptr_size>(), "thin_lock_thread_id") 1830 DO_THREAD_OFFSET(TopOfManagedStackOffset<ptr_size>(), "top_quick_frame_method") 1831 DO_THREAD_OFFSET(TopOfManagedStackPcOffset<ptr_size>(), "top_quick_frame_pc") 1832 DO_THREAD_OFFSET(TopShadowFrameOffset<ptr_size>(), "top_shadow_frame") 1833 DO_THREAD_OFFSET(TopHandleScopeOffset<ptr_size>(), "top_handle_scope") 1834 DO_THREAD_OFFSET(ThreadSuspendTriggerOffset<ptr_size>(), "suspend_trigger") 1835#undef DO_THREAD_OFFSET 1836 1837#define INTERPRETER_ENTRY_POINT_INFO(x) \ 1838 if (INTERPRETER_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1839 os << #x; \ 1840 return; \ 1841 } 1842 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge) 1843 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge) 1844#undef INTERPRETER_ENTRY_POINT_INFO 1845 1846#define JNI_ENTRY_POINT_INFO(x) \ 1847 if (JNI_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1848 os << #x; \ 1849 return; \ 1850 } 1851 JNI_ENTRY_POINT_INFO(pDlsymLookup) 1852#undef JNI_ENTRY_POINT_INFO 1853 1854#define PORTABLE_ENTRY_POINT_INFO(x) \ 1855 if (PORTABLE_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1856 os << #x; \ 1857 return; \ 1858 } 1859 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline) 1860 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline) 1861 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge) 1862#undef PORTABLE_ENTRY_POINT_INFO 1863 1864#define QUICK_ENTRY_POINT_INFO(x) \ 1865 if (QUICK_ENTRYPOINT_OFFSET(ptr_size, x).Uint32Value() == offset) { \ 1866 os << #x; \ 1867 return; \ 1868 } 1869 QUICK_ENTRY_POINT_INFO(pAllocArray) 1870 QUICK_ENTRY_POINT_INFO(pAllocArrayResolved) 1871 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck) 1872 QUICK_ENTRY_POINT_INFO(pAllocObject) 1873 QUICK_ENTRY_POINT_INFO(pAllocObjectResolved) 1874 QUICK_ENTRY_POINT_INFO(pAllocObjectInitialized) 1875 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck) 1876 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray) 1877 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck) 1878 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial) 1879 QUICK_ENTRY_POINT_INFO(pCheckCast) 1880 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage) 1881 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess) 1882 QUICK_ENTRY_POINT_INFO(pInitializeType) 1883 QUICK_ENTRY_POINT_INFO(pResolveString) 1884 QUICK_ENTRY_POINT_INFO(pSet32Instance) 1885 QUICK_ENTRY_POINT_INFO(pSet32Static) 1886 QUICK_ENTRY_POINT_INFO(pSet64Instance) 1887 QUICK_ENTRY_POINT_INFO(pSet64Static) 1888 QUICK_ENTRY_POINT_INFO(pSetObjInstance) 1889 QUICK_ENTRY_POINT_INFO(pSetObjStatic) 1890 QUICK_ENTRY_POINT_INFO(pGet32Instance) 1891 QUICK_ENTRY_POINT_INFO(pGet32Static) 1892 QUICK_ENTRY_POINT_INFO(pGet64Instance) 1893 QUICK_ENTRY_POINT_INFO(pGet64Static) 1894 QUICK_ENTRY_POINT_INFO(pGetObjInstance) 1895 QUICK_ENTRY_POINT_INFO(pGetObjStatic) 1896 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck) 1897 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck) 1898 QUICK_ENTRY_POINT_INFO(pAputObject) 1899 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData) 1900 QUICK_ENTRY_POINT_INFO(pJniMethodStart) 1901 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized) 1902 QUICK_ENTRY_POINT_INFO(pJniMethodEnd) 1903 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized) 1904 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference) 1905 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized) 1906 QUICK_ENTRY_POINT_INFO(pQuickGenericJniTrampoline) 1907 QUICK_ENTRY_POINT_INFO(pLockObject) 1908 QUICK_ENTRY_POINT_INFO(pUnlockObject) 1909 QUICK_ENTRY_POINT_INFO(pCmpgDouble) 1910 QUICK_ENTRY_POINT_INFO(pCmpgFloat) 1911 QUICK_ENTRY_POINT_INFO(pCmplDouble) 1912 QUICK_ENTRY_POINT_INFO(pCmplFloat) 1913 QUICK_ENTRY_POINT_INFO(pFmod) 1914 QUICK_ENTRY_POINT_INFO(pL2d) 1915 QUICK_ENTRY_POINT_INFO(pFmodf) 1916 QUICK_ENTRY_POINT_INFO(pL2f) 1917 QUICK_ENTRY_POINT_INFO(pD2iz) 1918 QUICK_ENTRY_POINT_INFO(pF2iz) 1919 QUICK_ENTRY_POINT_INFO(pIdivmod) 1920 QUICK_ENTRY_POINT_INFO(pD2l) 1921 QUICK_ENTRY_POINT_INFO(pF2l) 1922 QUICK_ENTRY_POINT_INFO(pLdiv) 1923 QUICK_ENTRY_POINT_INFO(pLmod) 1924 QUICK_ENTRY_POINT_INFO(pLmul) 1925 QUICK_ENTRY_POINT_INFO(pShlLong) 1926 QUICK_ENTRY_POINT_INFO(pShrLong) 1927 QUICK_ENTRY_POINT_INFO(pUshrLong) 1928 QUICK_ENTRY_POINT_INFO(pIndexOf) 1929 QUICK_ENTRY_POINT_INFO(pStringCompareTo) 1930 QUICK_ENTRY_POINT_INFO(pMemcpy) 1931 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline) 1932 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline) 1933 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge) 1934 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck) 1935 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck) 1936 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck) 1937 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck) 1938 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck) 1939 QUICK_ENTRY_POINT_INFO(pTestSuspend) 1940 QUICK_ENTRY_POINT_INFO(pDeliverException) 1941 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds) 1942 QUICK_ENTRY_POINT_INFO(pThrowDivZero) 1943 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod) 1944 QUICK_ENTRY_POINT_INFO(pThrowNullPointer) 1945 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow) 1946 QUICK_ENTRY_POINT_INFO(pA64Load) 1947 QUICK_ENTRY_POINT_INFO(pA64Store) 1948#undef QUICK_ENTRY_POINT_INFO 1949 1950 os << offset; 1951} 1952 1953void Thread::QuickDeliverException() { 1954 // Get exception from thread. 1955 ThrowLocation throw_location; 1956 mirror::Throwable* exception = GetException(&throw_location); 1957 CHECK(exception != nullptr); 1958 // Don't leave exception visible while we try to find the handler, which may cause class 1959 // resolution. 1960 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1961 ClearException(); 1962 bool is_deoptimization = (exception == GetDeoptimizationException()); 1963 QuickExceptionHandler exception_handler(this, is_deoptimization); 1964 if (is_deoptimization) { 1965 exception_handler.DeoptimizeStack(); 1966 } else { 1967 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1968 } 1969 exception_handler.UpdateInstrumentationStack(); 1970 exception_handler.DoLongJump(); 1971 LOG(FATAL) << "UNREACHABLE"; 1972} 1973 1974Context* Thread::GetLongJumpContext() { 1975 Context* result = tlsPtr_.long_jump_context; 1976 if (result == nullptr) { 1977 result = Context::Create(); 1978 } else { 1979 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1980 result->Reset(); 1981 } 1982 return result; 1983} 1984 1985// Note: this visitor may return with a method set, but dex_pc_ being DexFile:kDexNoIndex. This is 1986// so we don't abort in a special situation (thinlocked monitor) when dumping the Java stack. 1987struct CurrentMethodVisitor FINAL : public StackVisitor { 1988 CurrentMethodVisitor(Thread* thread, Context* context, bool abort_on_error) 1989 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1990 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0), 1991 abort_on_error_(abort_on_error) {} 1992 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1993 mirror::ArtMethod* m = GetMethod(); 1994 if (m->IsRuntimeMethod()) { 1995 // Continue if this is a runtime method. 1996 return true; 1997 } 1998 if (context_ != nullptr) { 1999 this_object_ = GetThisObject(); 2000 } 2001 method_ = m; 2002 dex_pc_ = GetDexPc(abort_on_error_); 2003 return false; 2004 } 2005 mirror::Object* this_object_; 2006 mirror::ArtMethod* method_; 2007 uint32_t dex_pc_; 2008 const bool abort_on_error_; 2009}; 2010 2011mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc, bool abort_on_error) const { 2012 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr, abort_on_error); 2013 visitor.WalkStack(false); 2014 if (dex_pc != nullptr) { 2015 *dex_pc = visitor.dex_pc_; 2016 } 2017 return visitor.method_; 2018} 2019 2020ThrowLocation Thread::GetCurrentLocationForThrow() { 2021 Context* context = GetLongJumpContext(); 2022 CurrentMethodVisitor visitor(this, context, true); 2023 visitor.WalkStack(false); 2024 ReleaseLongJumpContext(context); 2025 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 2026} 2027 2028bool Thread::HoldsLock(mirror::Object* object) const { 2029 if (object == nullptr) { 2030 return false; 2031 } 2032 return object->GetLockOwnerThreadId() == GetThreadId(); 2033} 2034 2035// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2036template <typename RootVisitor> 2037class ReferenceMapVisitor : public StackVisitor { 2038 public: 2039 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 2040 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2041 : StackVisitor(thread, context), visitor_(visitor) {} 2042 2043 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2044 if (false) { 2045 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2046 << StringPrintf("@ PC:%04x", GetDexPc()); 2047 } 2048 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2049 if (shadow_frame != nullptr) { 2050 VisitShadowFrame(shadow_frame); 2051 } else { 2052 VisitQuickFrame(); 2053 } 2054 return true; 2055 } 2056 2057 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2058 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 2059 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 2060 mirror::ArtMethod* m = *method_addr; 2061 DCHECK(m != nullptr); 2062 size_t num_regs = shadow_frame->NumberOfVRegs(); 2063 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2064 // handle scope for JNI or References for interpreter. 2065 for (size_t reg = 0; reg < num_regs; ++reg) { 2066 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2067 if (ref != nullptr) { 2068 mirror::Object* new_ref = ref; 2069 visitor_(&new_ref, reg, this); 2070 if (new_ref != ref) { 2071 shadow_frame->SetVRegReference(reg, new_ref); 2072 } 2073 } 2074 } 2075 } else { 2076 // Java method. 2077 // Portable path use DexGcMap and store in Method.native_gc_map_. 2078 const uint8_t* gc_map = m->GetNativeGcMap(sizeof(void*)); 2079 CHECK(gc_map != nullptr) << PrettyMethod(m); 2080 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2081 uint32_t dex_pc = shadow_frame->GetDexPC(); 2082 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2083 DCHECK(reg_bitmap != nullptr); 2084 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2085 for (size_t reg = 0; reg < num_regs; ++reg) { 2086 if (TestBitmap(reg, reg_bitmap)) { 2087 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2088 if (ref != nullptr) { 2089 mirror::Object* new_ref = ref; 2090 visitor_(&new_ref, reg, this); 2091 if (new_ref != ref) { 2092 shadow_frame->SetVRegReference(reg, new_ref); 2093 } 2094 } 2095 } 2096 } 2097 } 2098 } 2099 2100 private: 2101 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2102 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2103 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2104 mirror::ArtMethod* old_method = m; 2105 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2106 if (m != old_method) { 2107 cur_quick_frame->Assign(m); 2108 } 2109 2110 // Process register map (which native and runtime methods don't have) 2111 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2112 const uint8_t* native_gc_map = m->GetNativeGcMap(sizeof(void*)); 2113 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2114 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2115 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2116 NativePcOffsetToReferenceMap map(native_gc_map); 2117 size_t num_regs = std::min(map.RegWidth() * 8, 2118 static_cast<size_t>(code_item->registers_size_)); 2119 if (num_regs > 0) { 2120 Runtime* runtime = Runtime::Current(); 2121 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m, sizeof(void*)); 2122 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2123 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2124 DCHECK(reg_bitmap != nullptr); 2125 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2126 const VmapTable vmap_table(m->GetVmapTable(code_pointer, sizeof(void*))); 2127 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2128 // For all dex registers in the bitmap 2129 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2130 DCHECK(cur_quick_frame != nullptr); 2131 for (size_t reg = 0; reg < num_regs; ++reg) { 2132 // Does this register hold a reference? 2133 if (TestBitmap(reg, reg_bitmap)) { 2134 uint32_t vmap_offset; 2135 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2136 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2137 kReferenceVReg); 2138 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2139 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2140 if (*ref_addr != nullptr) { 2141 visitor_(ref_addr, reg, this); 2142 } 2143 } else { 2144 StackReference<mirror::Object>* ref_addr = 2145 reinterpret_cast<StackReference<mirror::Object>*>( 2146 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2147 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2148 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2149 if (ref != nullptr) { 2150 mirror::Object* new_ref = ref; 2151 visitor_(&new_ref, reg, this); 2152 if (ref != new_ref) { 2153 ref_addr->Assign(new_ref); 2154 } 2155 } 2156 } 2157 } 2158 } 2159 } 2160 } 2161 } 2162 2163 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2164 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2165 } 2166 2167 // Visitor for when we visit a root. 2168 const RootVisitor& visitor_; 2169}; 2170 2171class RootCallbackVisitor { 2172 public: 2173 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2174 : callback_(callback), arg_(arg), tid_(tid) {} 2175 2176 void operator()(mirror::Object** obj, size_t vreg, const StackVisitor* stack_visitor) const { 2177 callback_(obj, arg_, JavaFrameRootInfo(tid_, stack_visitor, vreg)); 2178 } 2179 2180 private: 2181 RootCallback* const callback_; 2182 void* const arg_; 2183 const uint32_t tid_; 2184}; 2185 2186void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2187 VerifyObject(class_loader_override); 2188 tlsPtr_.class_loader_override = class_loader_override; 2189} 2190 2191void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2192 uint32_t thread_id = GetThreadId(); 2193 if (tlsPtr_.opeer != nullptr) { 2194 visitor(&tlsPtr_.opeer, arg, RootInfo(kRootThreadObject, thread_id)); 2195 } 2196 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2197 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, 2198 RootInfo(kRootNativeStack, thread_id)); 2199 } 2200 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2201 if (tlsPtr_.class_loader_override != nullptr) { 2202 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, 2203 RootInfo(kRootNativeStack, thread_id)); 2204 } 2205 if (tlsPtr_.monitor_enter_object != nullptr) { 2206 visitor(&tlsPtr_.monitor_enter_object, arg, RootInfo(kRootNativeStack, thread_id)); 2207 } 2208 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, RootInfo(kRootJNILocal, thread_id)); 2209 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, RootInfo(kRootJNIMonitor, thread_id)); 2210 HandleScopeVisitRoots(visitor, arg, thread_id); 2211 if (tlsPtr_.debug_invoke_req != nullptr) { 2212 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, RootInfo(kRootDebugger, thread_id)); 2213 } 2214 if (tlsPtr_.single_step_control != nullptr) { 2215 tlsPtr_.single_step_control->VisitRoots(visitor, arg, RootInfo(kRootDebugger, thread_id)); 2216 } 2217 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2218 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2219 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2220 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2221 shadow_frame = shadow_frame->GetLink()) { 2222 mapper.VisitShadowFrame(shadow_frame); 2223 } 2224 } 2225 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2226 RootCallbackVisitor visitor_to_callback(visitor, arg, thread_id); 2227 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitor_to_callback); 2228 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2229 shadow_frame != nullptr; 2230 shadow_frame = shadow_frame->GetLink()) { 2231 mapper.VisitShadowFrame(shadow_frame); 2232 } 2233 } 2234 // Visit roots on this thread's stack 2235 Context* context = GetLongJumpContext(); 2236 RootCallbackVisitor visitor_to_callback(visitor, arg, thread_id); 2237 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitor_to_callback); 2238 mapper.WalkStack(); 2239 ReleaseLongJumpContext(context); 2240 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2241 if (frame.this_object_ != nullptr) { 2242 visitor(&frame.this_object_, arg, RootInfo(kRootVMInternal, thread_id)); 2243 } 2244 DCHECK(frame.method_ != nullptr); 2245 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, 2246 RootInfo(kRootVMInternal, thread_id)); 2247 } 2248} 2249 2250static void VerifyRoot(mirror::Object** root, void* /*arg*/, const RootInfo& /*root_info*/) 2251 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2252 VerifyObject(*root); 2253} 2254 2255void Thread::VerifyStackImpl() { 2256 std::unique_ptr<Context> context(Context::Create()); 2257 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2258 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2259 mapper.WalkStack(); 2260} 2261 2262// Set the stack end to that to be used during a stack overflow 2263void Thread::SetStackEndForStackOverflow() { 2264 // During stack overflow we allow use of the full stack. 2265 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2266 // However, we seem to have already extended to use the full stack. 2267 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2268 << GetStackOverflowReservedBytes(kRuntimeISA) << ")?"; 2269 DumpStack(LOG(ERROR)); 2270 LOG(FATAL) << "Recursive stack overflow."; 2271 } 2272 2273 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2274 2275 // Remove the stack overflow protection if is it set up. 2276 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 2277 if (implicit_stack_check) { 2278 if (!UnprotectStack()) { 2279 LOG(ERROR) << "Unable to remove stack protection for stack overflow"; 2280 } 2281 } 2282} 2283 2284void Thread::SetTlab(byte* start, byte* end) { 2285 DCHECK_LE(start, end); 2286 tlsPtr_.thread_local_start = start; 2287 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2288 tlsPtr_.thread_local_end = end; 2289 tlsPtr_.thread_local_objects = 0; 2290} 2291 2292bool Thread::HasTlab() const { 2293 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2294 if (has_tlab) { 2295 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2296 } else { 2297 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2298 } 2299 return has_tlab; 2300} 2301 2302std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2303 thread.ShortDump(os); 2304 return os; 2305} 2306 2307void Thread::ProtectStack() { 2308 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2309 VLOG(threads) << "Protecting stack at " << pregion; 2310 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 2311 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. " 2312 "Reason: " 2313 << strerror(errno) << " size: " << kStackOverflowProtectedSize; 2314 } 2315} 2316 2317bool Thread::UnprotectStack() { 2318 void* pregion = tlsPtr_.stack_begin - kStackOverflowProtectedSize; 2319 VLOG(threads) << "Unprotecting stack at " << pregion; 2320 return mprotect(pregion, kStackOverflowProtectedSize, PROT_READ|PROT_WRITE) == 0; 2321} 2322 2323 2324} // namespace art 2325