thread.cc revision 34e826ccc80dc1cf7c4c045de6b7f8360d504ccf
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.h" 36#include "class_linker-inl.h" 37#include "cutils/atomic.h" 38#include "cutils/atomic-inline.h" 39#include "debugger.h" 40#include "dex_file-inl.h" 41#include "entrypoints/entrypoint_utils.h" 42#include "entrypoints/quick/quick_alloc_entrypoints.h" 43#include "gc_map.h" 44#include "gc/accounting/card_table-inl.h" 45#include "gc/heap.h" 46#include "gc/space/space.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-inl.h" 53#include "mirror/class_loader.h" 54#include "mirror/object_array-inl.h" 55#include "mirror/stack_trace_element.h" 56#include "monitor.h" 57#include "object_utils.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 "handle_scope-inl.h" 66#include "stack.h" 67#include "thread-inl.h" 68#include "thread_list.h" 69#include "utils.h" 70#include "verifier/dex_gc_map.h" 71#include "verify_object-inl.h" 72#include "vmap_table.h" 73#include "well_known_classes.h" 74 75namespace art { 76 77bool Thread::is_started_ = false; 78pthread_key_t Thread::pthread_key_self_; 79ConditionVariable* Thread::resume_cond_ = nullptr; 80 81static const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 82 83void Thread::InitCardTable() { 84 tlsPtr_.card_table = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 85} 86 87static void UnimplementedEntryPoint() { 88 UNIMPLEMENTED(FATAL); 89} 90 91void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 92 PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 93 94void Thread::InitTlsEntryPoints() { 95 // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 96 uintptr_t* begin = reinterpret_cast<uintptr_t*>(&tlsPtr_.interpreter_entrypoints); 97 uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + 98 sizeof(tlsPtr_.quick_entrypoints)); 99 for (uintptr_t* it = begin; it != end; ++it) { 100 *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 101 } 102 InitEntryPoints(&tlsPtr_.interpreter_entrypoints, &tlsPtr_.jni_entrypoints, 103 &tlsPtr_.portable_entrypoints, &tlsPtr_.quick_entrypoints); 104} 105 106void Thread::ResetQuickAllocEntryPointsForThread() { 107 ResetQuickAllocEntryPoints(&tlsPtr_.quick_entrypoints); 108} 109 110void Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 111 tlsPtr_.deoptimization_shadow_frame = sf; 112} 113 114void Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 115 tls64_.deoptimization_return_value.SetJ(ret_val.GetJ()); 116} 117 118ShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 119 ShadowFrame* sf = tlsPtr_.deoptimization_shadow_frame; 120 tlsPtr_.deoptimization_shadow_frame = nullptr; 121 ret_val->SetJ(tls64_.deoptimization_return_value.GetJ()); 122 return sf; 123} 124 125void Thread::SetShadowFrameUnderConstruction(ShadowFrame* sf) { 126 sf->SetLink(tlsPtr_.shadow_frame_under_construction); 127 tlsPtr_.shadow_frame_under_construction = sf; 128} 129 130void Thread::ClearShadowFrameUnderConstruction() { 131 CHECK_NE(static_cast<ShadowFrame*>(nullptr), tlsPtr_.shadow_frame_under_construction); 132 tlsPtr_.shadow_frame_under_construction = tlsPtr_.shadow_frame_under_construction->GetLink(); 133} 134 135void Thread::InitTid() { 136 tls32_.tid = ::art::GetTid(); 137} 138 139void Thread::InitAfterFork() { 140 // One thread (us) survived the fork, but we have a new tid so we need to 141 // update the value stashed in this Thread*. 142 InitTid(); 143} 144 145void* Thread::CreateCallback(void* arg) { 146 Thread* self = reinterpret_cast<Thread*>(arg); 147 Runtime* runtime = Runtime::Current(); 148 if (runtime == nullptr) { 149 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 150 return nullptr; 151 } 152 { 153 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 154 // after self->Init(). 155 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 156 // Check that if we got here we cannot be shutting down (as shutdown should never have started 157 // while threads are being born). 158 CHECK(!runtime->IsShuttingDownLocked()); 159 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 160 Runtime::Current()->EndThreadBirth(); 161 } 162 { 163 ScopedObjectAccess soa(self); 164 165 // Copy peer into self, deleting global reference when done. 166 CHECK(self->tlsPtr_.jpeer != nullptr); 167 self->tlsPtr_.opeer = soa.Decode<mirror::Object*>(self->tlsPtr_.jpeer); 168 self->GetJniEnv()->DeleteGlobalRef(self->tlsPtr_.jpeer); 169 self->tlsPtr_.jpeer = nullptr; 170 self->SetThreadName(self->GetThreadName(soa)->ToModifiedUtf8().c_str()); 171 Dbg::PostThreadStart(self); 172 173 // Invoke the 'run' method of our java.lang.Thread. 174 mirror::Object* receiver = self->tlsPtr_.opeer; 175 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 176 InvokeVirtualOrInterfaceWithJValues(soa, receiver, mid, nullptr); 177 } 178 // Detach and delete self. 179 Runtime::Current()->GetThreadList()->Unregister(self); 180 181 return nullptr; 182} 183 184Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 185 mirror::Object* thread_peer) { 186 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 187 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetLong(thread_peer))); 188 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 189 // to stop it from going away. 190 if (kIsDebugBuild) { 191 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 192 if (result != nullptr && !result->IsSuspended()) { 193 Locks::thread_list_lock_->AssertHeld(soa.Self()); 194 } 195 } 196 return result; 197} 198 199Thread* Thread::FromManagedThread(const ScopedObjectAccessAlreadyRunnable& soa, 200 jobject java_thread) { 201 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 202} 203 204static size_t FixStackSize(size_t stack_size) { 205 // A stack size of zero means "use the default". 206 if (stack_size == 0) { 207 stack_size = Runtime::Current()->GetDefaultStackSize(); 208 } 209 210 // Dalvik used the bionic pthread default stack size for native threads, 211 // so include that here to support apps that expect large native stacks. 212 stack_size += 1 * MB; 213 214 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 215 if (stack_size < PTHREAD_STACK_MIN) { 216 stack_size = PTHREAD_STACK_MIN; 217 } 218 219 if (Runtime::Current()->ExplicitStackOverflowChecks()) { 220 // It's likely that callers are trying to ensure they have at least a certain amount of 221 // stack space, so we should add our reserved space on top of what they requested, rather 222 // than implicitly take it away from them. 223 stack_size += kRuntimeStackOverflowReservedBytes; 224 } else { 225 // If we are going to use implicit stack checks, allocate space for the protected 226 // region at the bottom of the stack. 227 stack_size += Thread::kStackOverflowImplicitCheckSize; 228 } 229 230 // Some systems require the stack size to be a multiple of the system page size, so round up. 231 stack_size = RoundUp(stack_size, kPageSize); 232 233 return stack_size; 234} 235 236// Global variable to prevent the compiler optimizing away the page reads for the stack. 237byte dont_optimize_this; 238 239// Install a protected region in the stack. This is used to trigger a SIGSEGV if a stack 240// overflow is detected. It is located right below the stack_end_. Just below that 241// is the StackOverflow reserved region used when creating the StackOverflow 242// exception. 243// 244// There is a little complexity here that deserves a special mention. When running on the 245// host (glibc), the process's main thread's stack is allocated with a special flag 246// to prevent memory being allocated when it's not needed. This flag makes the 247// kernel only allocate memory for the stack by growing down in memory. Because we 248// want to put an mprotected region far away from that at the stack top, we need 249// to make sure the pages for the stack are mapped in before we call mprotect. We do 250// this by reading every page from the stack bottom (highest address) to the stack top. 251// We then madvise this away. 252void Thread::InstallImplicitProtection(bool is_main_stack) { 253 byte* pregion = tlsPtr_.stack_end; 254 byte* stack_lowmem = tlsPtr_.stack_begin; 255 byte* stack_top = reinterpret_cast<byte*>(reinterpret_cast<uintptr_t>(&pregion) & 256 ~(kPageSize - 1)); // Page containing current top of stack. 257 258#ifndef HAVE_ANDROID_OS 259 bool running_on_host = true; 260#else 261 bool running_on_host = false; 262#endif 263 264 if (running_on_host) { 265 // On Host, we need to map in the main stack. This must be done by reading from the 266 // current stack pointer downwards as the stack is mapped using VM_GROWSDOWN 267 // in the kernel. Any access more than a page below the current SP will cause 268 // a segv. 269 if (is_main_stack) { 270 // First we need to unprotect the protected region because this may 271 // be called more than once for a particular stack and we will crash 272 // if we try to read the protected page. 273 mprotect(pregion - kStackOverflowProtectedSize, kStackOverflowProtectedSize, PROT_READ); 274 275 // Read every page from the high address to the low. 276 for (byte* p = stack_top; p > stack_lowmem; p -= kPageSize) { 277 dont_optimize_this = *p; 278 } 279 } 280 } 281 282 // Check and place a marker word at the lowest usable address in the stack. This 283 // is used to prevent a double protection. 284 constexpr uint32_t kMarker = 0xdadadada; 285 uintptr_t *marker = reinterpret_cast<uintptr_t*>(pregion); 286 if (*marker == kMarker) { 287 // The region has already been set up. But on the main stack on the host we have 288 // removed the protected region in order to read the stack memory. We need to put 289 // this back again. 290 if (is_main_stack && running_on_host) { 291 mprotect(pregion - kStackOverflowProtectedSize, kStackOverflowProtectedSize, PROT_NONE); 292 madvise(stack_lowmem, stack_top - stack_lowmem, MADV_DONTNEED); 293 } 294 return; 295 } 296 // Add marker so that we can detect a second attempt to do this. 297 *marker = kMarker; 298 299 if (!running_on_host) { 300 // Running on Android, stacks are mapped cleanly. The protected region for the 301 // main stack just needs to be mapped in. We do this by writing one byte per page. 302 for (byte* p = pregion - kStackOverflowProtectedSize; p < pregion; p += kPageSize) { 303 *p = 0; 304 } 305 } 306 307 pregion -= kStackOverflowProtectedSize; 308 309 VLOG(threads) << "installing stack protected region at " << std::hex << 310 static_cast<void*>(pregion) << " to " << 311 static_cast<void*>(pregion + kStackOverflowProtectedSize - 1); 312 313 314 if (mprotect(pregion, kStackOverflowProtectedSize, PROT_NONE) == -1) { 315 LOG(FATAL) << "Unable to create protected region in stack for implicit overflow check. Reason:" 316 << strerror(errno); 317 } 318 319 // Tell the kernel that we won't be needing these pages any more. 320 // NB. madvise will probably write zeroes into the memory (on linux it does). 321 if (is_main_stack) { 322 if (running_on_host) { 323 // On the host, it's the whole stack (minus a page to prevent overwrite of stack top). 324 madvise(stack_lowmem, stack_top - stack_lowmem - kPageSize, MADV_DONTNEED); 325 } else { 326 // On Android, just the protected region. 327 madvise(pregion, kStackOverflowProtectedSize, MADV_DONTNEED); 328 } 329 } 330} 331 332void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 333 CHECK(java_peer != nullptr); 334 Thread* self = static_cast<JNIEnvExt*>(env)->self; 335 Runtime* runtime = Runtime::Current(); 336 337 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 338 bool thread_start_during_shutdown = false; 339 { 340 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 341 if (runtime->IsShuttingDownLocked()) { 342 thread_start_during_shutdown = true; 343 } else { 344 runtime->StartThreadBirth(); 345 } 346 } 347 if (thread_start_during_shutdown) { 348 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 349 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 350 return; 351 } 352 353 Thread* child_thread = new Thread(is_daemon); 354 // Use global JNI ref to hold peer live while child thread starts. 355 child_thread->tlsPtr_.jpeer = env->NewGlobalRef(java_peer); 356 stack_size = FixStackSize(stack_size); 357 358 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 359 // assign it. 360 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 361 reinterpret_cast<jlong>(child_thread)); 362 363 pthread_t new_pthread; 364 pthread_attr_t attr; 365 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 366 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 367 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 368 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 369 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 370 371 if (pthread_create_result != 0) { 372 // pthread_create(3) failed, so clean up. 373 { 374 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 375 runtime->EndThreadBirth(); 376 } 377 // Manually delete the global reference since Thread::Init will not have been run. 378 env->DeleteGlobalRef(child_thread->tlsPtr_.jpeer); 379 child_thread->tlsPtr_.jpeer = nullptr; 380 delete child_thread; 381 child_thread = nullptr; 382 // TODO: remove from thread group? 383 env->SetLongField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 384 { 385 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 386 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 387 ScopedObjectAccess soa(env); 388 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 389 } 390 } 391} 392 393void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 394 // This function does all the initialization that must be run by the native thread it applies to. 395 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 396 // we can handshake with the corresponding native thread when it's ready.) Check this native 397 // thread hasn't been through here already... 398 CHECK(Thread::Current() == nullptr); 399 SetUpAlternateSignalStack(); 400 InitCpu(); 401 InitTlsEntryPoints(); 402 RemoveSuspendTrigger(); 403 InitCardTable(); 404 InitTid(); 405 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 406 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 407 tlsPtr_.pthread_self = pthread_self(); 408 CHECK(is_started_); 409 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 410 DCHECK_EQ(Thread::Current(), this); 411 412 tls32_.thin_lock_thread_id = thread_list->AllocThreadId(this); 413 InitStackHwm(); 414 415 tlsPtr_.jni_env = new JNIEnvExt(this, java_vm); 416 thread_list->Register(this); 417} 418 419Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 420 bool create_peer) { 421 Thread* self; 422 Runtime* runtime = Runtime::Current(); 423 if (runtime == nullptr) { 424 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 425 return nullptr; 426 } 427 { 428 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 429 if (runtime->IsShuttingDownLocked()) { 430 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 431 return nullptr; 432 } else { 433 Runtime::Current()->StartThreadBirth(); 434 self = new Thread(as_daemon); 435 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 436 Runtime::Current()->EndThreadBirth(); 437 } 438 } 439 440 CHECK_NE(self->GetState(), kRunnable); 441 self->SetState(kNative); 442 443 // If we're the main thread, ClassLinker won't be created until after we're attached, 444 // so that thread needs a two-stage attach. Regular threads don't need this hack. 445 // In the compiler, all threads need this hack, because no-one's going to be getting 446 // a native peer! 447 if (create_peer) { 448 self->CreatePeer(thread_name, as_daemon, thread_group); 449 } else { 450 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 451 if (thread_name != nullptr) { 452 self->tlsPtr_.name->assign(thread_name); 453 ::art::SetThreadName(thread_name); 454 } 455 } 456 457 return self; 458} 459 460void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 461 Runtime* runtime = Runtime::Current(); 462 CHECK(runtime->IsStarted()); 463 JNIEnv* env = tlsPtr_.jni_env; 464 465 if (thread_group == nullptr) { 466 thread_group = runtime->GetMainThreadGroup(); 467 } 468 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 469 jint thread_priority = GetNativePriority(); 470 jboolean thread_is_daemon = as_daemon; 471 472 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 473 if (peer.get() == nullptr) { 474 CHECK(IsExceptionPending()); 475 return; 476 } 477 { 478 ScopedObjectAccess soa(this); 479 tlsPtr_.opeer = soa.Decode<mirror::Object*>(peer.get()); 480 } 481 env->CallNonvirtualVoidMethod(peer.get(), 482 WellKnownClasses::java_lang_Thread, 483 WellKnownClasses::java_lang_Thread_init, 484 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 485 AssertNoPendingException(); 486 487 Thread* self = this; 488 DCHECK_EQ(self, Thread::Current()); 489 env->SetLongField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 490 reinterpret_cast<jlong>(self)); 491 492 ScopedObjectAccess soa(self); 493 StackHandleScope<1> hs(self); 494 Handle<mirror::String> peer_thread_name(hs.NewHandle(GetThreadName(soa))); 495 if (peer_thread_name.Get() == nullptr) { 496 // The Thread constructor should have set the Thread.name to a 497 // non-null value. However, because we can run without code 498 // available (in the compiler, in tests), we manually assign the 499 // fields the constructor should have set. 500 if (runtime->IsActiveTransaction()) { 501 InitPeer<true>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 502 } else { 503 InitPeer<false>(soa, thread_is_daemon, thread_group, thread_name.get(), thread_priority); 504 } 505 peer_thread_name.Assign(GetThreadName(soa)); 506 } 507 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 508 if (peer_thread_name.Get() != nullptr) { 509 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 510 } 511} 512 513template<bool kTransactionActive> 514void Thread::InitPeer(ScopedObjectAccess& soa, jboolean thread_is_daemon, jobject thread_group, 515 jobject thread_name, jint thread_priority) { 516 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 517 SetBoolean<kTransactionActive>(tlsPtr_.opeer, thread_is_daemon); 518 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 519 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_group)); 520 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 521 SetObject<kTransactionActive>(tlsPtr_.opeer, soa.Decode<mirror::Object*>(thread_name)); 522 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 523 SetInt<kTransactionActive>(tlsPtr_.opeer, thread_priority); 524} 525 526void Thread::SetThreadName(const char* name) { 527 tlsPtr_.name->assign(name); 528 ::art::SetThreadName(name); 529 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 530} 531 532void Thread::InitStackHwm() { 533 void* read_stack_base; 534 size_t read_stack_size; 535 GetThreadStack(tlsPtr_.pthread_self, &read_stack_base, &read_stack_size); 536 537 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 538 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", read_stack_base, 539 PrettySize(read_stack_size).c_str()); 540 541 tlsPtr_.stack_begin = reinterpret_cast<byte*>(read_stack_base); 542 tlsPtr_.stack_size = read_stack_size; 543 544 if (read_stack_size <= kRuntimeStackOverflowReservedBytes) { 545 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << read_stack_size 546 << " bytes)"; 547 } 548 549 // TODO: move this into the Linux GetThreadStack implementation. 550#if defined(__APPLE__) 551 bool is_main_thread = false; 552#else 553 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 554 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 555 // will be broken because we'll die long before we get close to 2GB. 556 bool is_main_thread = (::art::GetTid() == getpid()); 557 if (is_main_thread) { 558 rlimit stack_limit; 559 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 560 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 561 } 562 if (stack_limit.rlim_cur == RLIM_INFINITY) { 563 // Find the default stack size for new threads... 564 pthread_attr_t default_attributes; 565 size_t default_stack_size; 566 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 567 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 568 "default stack size query"); 569 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 570 571 // ...and use that as our limit. 572 size_t old_stack_size = read_stack_size; 573 tlsPtr_.stack_size = default_stack_size; 574 tlsPtr_.stack_begin += (old_stack_size - default_stack_size); 575 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 576 << " to " << PrettySize(default_stack_size) 577 << " with base " << reinterpret_cast<void*>(tlsPtr_.stack_begin); 578 } 579 } 580#endif 581 582 // Set stack_end_ to the bottom of the stack saving space of stack overflows 583 bool implicit_stack_check = !Runtime::Current()->ExplicitStackOverflowChecks(); 584 ResetDefaultStackEnd(implicit_stack_check); 585 586 // Install the protected region if we are doing implicit overflow checks. 587 if (implicit_stack_check) { 588 if (is_main_thread) { 589 size_t guardsize; 590 pthread_attr_t attributes; 591 CHECK_PTHREAD_CALL(pthread_attr_init, (&attributes), "guard size query"); 592 CHECK_PTHREAD_CALL(pthread_attr_getguardsize, (&attributes, &guardsize), "guard size query"); 593 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attributes), "guard size query"); 594 // The main thread might have protected region at the bottom. We need 595 // to install our own region so we need to move the limits 596 // of the stack to make room for it. 597 tlsPtr_.stack_begin += guardsize; 598 tlsPtr_.stack_end += guardsize; 599 tlsPtr_.stack_size -= guardsize; 600 } 601 InstallImplicitProtection(is_main_thread); 602 } 603 604 // Sanity check. 605 int stack_variable; 606 CHECK_GT(&stack_variable, reinterpret_cast<void*>(tlsPtr_.stack_end)); 607} 608 609void Thread::ShortDump(std::ostream& os) const { 610 os << "Thread["; 611 if (GetThreadId() != 0) { 612 // If we're in kStarting, we won't have a thin lock id or tid yet. 613 os << GetThreadId() 614 << ",tid=" << GetTid() << ','; 615 } 616 os << GetState() 617 << ",Thread*=" << this 618 << ",peer=" << tlsPtr_.opeer 619 << ",\"" << *tlsPtr_.name << "\"" 620 << "]"; 621} 622 623void Thread::Dump(std::ostream& os) const { 624 DumpState(os); 625 DumpStack(os); 626} 627 628mirror::String* Thread::GetThreadName(const ScopedObjectAccessAlreadyRunnable& soa) const { 629 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 630 return (tlsPtr_.opeer != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(tlsPtr_.opeer)) : nullptr; 631} 632 633void Thread::GetThreadName(std::string& name) const { 634 name.assign(*tlsPtr_.name); 635} 636 637uint64_t Thread::GetCpuMicroTime() const { 638#if defined(HAVE_POSIX_CLOCKS) 639 clockid_t cpu_clock_id; 640 pthread_getcpuclockid(tlsPtr_.pthread_self, &cpu_clock_id); 641 timespec now; 642 clock_gettime(cpu_clock_id, &now); 643 return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000) + now.tv_nsec / UINT64_C(1000); 644#else 645 UNIMPLEMENTED(WARNING); 646 return -1; 647#endif 648} 649 650void Thread::AtomicSetFlag(ThreadFlag flag) { 651 android_atomic_or(flag, &tls32_.state_and_flags.as_int); 652} 653 654void Thread::AtomicClearFlag(ThreadFlag flag) { 655 android_atomic_and(-1 ^ flag, &tls32_.state_and_flags.as_int); 656} 657 658// Attempt to rectify locks so that we dump thread list with required locks before exiting. 659static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 660 LOG(ERROR) << *thread << " suspend count already zero."; 661 Locks::thread_suspend_count_lock_->Unlock(self); 662 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 663 Locks::mutator_lock_->SharedTryLock(self); 664 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 665 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 666 } 667 } 668 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 669 Locks::thread_list_lock_->TryLock(self); 670 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 671 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 672 } 673 } 674 std::ostringstream ss; 675 Runtime::Current()->GetThreadList()->DumpLocked(ss); 676 LOG(FATAL) << ss.str(); 677} 678 679void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 680 if (kIsDebugBuild) { 681 DCHECK(delta == -1 || delta == +1 || delta == -tls32_.debug_suspend_count) 682 << delta << " " << tls32_.debug_suspend_count << " " << this; 683 DCHECK_GE(tls32_.suspend_count, tls32_.debug_suspend_count) << this; 684 Locks::thread_suspend_count_lock_->AssertHeld(self); 685 if (this != self && !IsSuspended()) { 686 Locks::thread_list_lock_->AssertHeld(self); 687 } 688 } 689 if (UNLIKELY(delta < 0 && tls32_.suspend_count <= 0)) { 690 UnsafeLogFatalForSuspendCount(self, this); 691 return; 692 } 693 694 tls32_.suspend_count += delta; 695 if (for_debugger) { 696 tls32_.debug_suspend_count += delta; 697 } 698 699 if (tls32_.suspend_count == 0) { 700 AtomicClearFlag(kSuspendRequest); 701 } else { 702 AtomicSetFlag(kSuspendRequest); 703 TriggerSuspend(); 704 } 705} 706 707void Thread::RunCheckpointFunction() { 708 Closure *checkpoints[kMaxCheckpoints]; 709 710 // Grab the suspend_count lock and copy the current set of 711 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 712 // function will also grab this lock so we prevent a race between setting 713 // the kCheckpointRequest flag and clearing it. 714 { 715 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 716 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 717 checkpoints[i] = tlsPtr_.checkpoint_functions[i]; 718 tlsPtr_.checkpoint_functions[i] = nullptr; 719 } 720 AtomicClearFlag(kCheckpointRequest); 721 } 722 723 // Outside the lock, run all the checkpoint functions that 724 // we collected. 725 bool found_checkpoint = false; 726 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 727 if (checkpoints[i] != nullptr) { 728 ATRACE_BEGIN("Checkpoint function"); 729 checkpoints[i]->Run(this); 730 ATRACE_END(); 731 found_checkpoint = true; 732 } 733 } 734 CHECK(found_checkpoint); 735} 736 737bool Thread::RequestCheckpoint(Closure* function) { 738 union StateAndFlags old_state_and_flags; 739 old_state_and_flags.as_int = tls32_.state_and_flags.as_int; 740 if (old_state_and_flags.as_struct.state != kRunnable) { 741 return false; // Fail, thread is suspended and so can't run a checkpoint. 742 } 743 744 uint32_t available_checkpoint = kMaxCheckpoints; 745 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 746 if (tlsPtr_.checkpoint_functions[i] == nullptr) { 747 available_checkpoint = i; 748 break; 749 } 750 } 751 if (available_checkpoint == kMaxCheckpoints) { 752 // No checkpoint functions available, we can't run a checkpoint 753 return false; 754 } 755 tlsPtr_.checkpoint_functions[available_checkpoint] = function; 756 757 // Checkpoint function installed now install flag bit. 758 // We must be runnable to request a checkpoint. 759 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 760 union StateAndFlags new_state_and_flags; 761 new_state_and_flags.as_int = old_state_and_flags.as_int; 762 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 763 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 764 &tls32_.state_and_flags.as_int); 765 if (UNLIKELY(succeeded != 0)) { 766 // The thread changed state before the checkpoint was installed. 767 CHECK_EQ(tlsPtr_.checkpoint_functions[available_checkpoint], function); 768 tlsPtr_.checkpoint_functions[available_checkpoint] = nullptr; 769 } else { 770 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 771 TriggerSuspend(); 772 } 773 return succeeded == 0; 774} 775 776void Thread::FullSuspendCheck() { 777 VLOG(threads) << this << " self-suspending"; 778 ATRACE_BEGIN("Full suspend check"); 779 // Make thread appear suspended to other threads, release mutator_lock_. 780 TransitionFromRunnableToSuspended(kSuspended); 781 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 782 TransitionFromSuspendedToRunnable(); 783 ATRACE_END(); 784 VLOG(threads) << this << " self-reviving"; 785} 786 787void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 788 std::string group_name; 789 int priority; 790 bool is_daemon = false; 791 Thread* self = Thread::Current(); 792 793 // Don't do this if we are aborting since the GC may have all the threads suspended. This will 794 // cause ScopedObjectAccessUnchecked to deadlock. 795 if (gAborting == 0 && self != nullptr && thread != nullptr && thread->tlsPtr_.opeer != nullptr) { 796 ScopedObjectAccessUnchecked soa(self); 797 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority) 798 ->GetInt(thread->tlsPtr_.opeer); 799 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon) 800 ->GetBoolean(thread->tlsPtr_.opeer); 801 802 mirror::Object* thread_group = 803 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->tlsPtr_.opeer); 804 805 if (thread_group != nullptr) { 806 mirror::ArtField* group_name_field = 807 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 808 mirror::String* group_name_string = 809 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 810 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 811 } 812 } else { 813 priority = GetNativePriority(); 814 } 815 816 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 817 if (scheduler_group_name.empty()) { 818 scheduler_group_name = "default"; 819 } 820 821 if (thread != nullptr) { 822 os << '"' << *thread->tlsPtr_.name << '"'; 823 if (is_daemon) { 824 os << " daemon"; 825 } 826 os << " prio=" << priority 827 << " tid=" << thread->GetThreadId() 828 << " " << thread->GetState(); 829 if (thread->IsStillStarting()) { 830 os << " (still starting up)"; 831 } 832 os << "\n"; 833 } else { 834 os << '"' << ::art::GetThreadName(tid) << '"' 835 << " prio=" << priority 836 << " (not attached)\n"; 837 } 838 839 if (thread != nullptr) { 840 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 841 os << " | group=\"" << group_name << "\"" 842 << " sCount=" << thread->tls32_.suspend_count 843 << " dsCount=" << thread->tls32_.debug_suspend_count 844 << " obj=" << reinterpret_cast<void*>(thread->tlsPtr_.opeer) 845 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 846 } 847 848 os << " | sysTid=" << tid 849 << " nice=" << getpriority(PRIO_PROCESS, tid) 850 << " cgrp=" << scheduler_group_name; 851 if (thread != nullptr) { 852 int policy; 853 sched_param sp; 854 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->tlsPtr_.pthread_self, &policy, &sp), 855 __FUNCTION__); 856 os << " sched=" << policy << "/" << sp.sched_priority 857 << " handle=" << reinterpret_cast<void*>(thread->tlsPtr_.pthread_self); 858 } 859 os << "\n"; 860 861 // Grab the scheduler stats for this thread. 862 std::string scheduler_stats; 863 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 864 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 865 } else { 866 scheduler_stats = "0 0 0"; 867 } 868 869 char native_thread_state = '?'; 870 int utime = 0; 871 int stime = 0; 872 int task_cpu = 0; 873 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 874 875 os << " | state=" << native_thread_state 876 << " schedstat=( " << scheduler_stats << " )" 877 << " utm=" << utime 878 << " stm=" << stime 879 << " core=" << task_cpu 880 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 881 if (thread != nullptr) { 882 os << " | stack=" << reinterpret_cast<void*>(thread->tlsPtr_.stack_begin) << "-" 883 << reinterpret_cast<void*>(thread->tlsPtr_.stack_end) << " stackSize=" 884 << PrettySize(thread->tlsPtr_.stack_size) << "\n"; 885 // Dump the held mutexes. 886 os << " | held mutexes="; 887 for (size_t i = 0; i < kLockLevelCount; ++i) { 888 if (i != kMonitorLock) { 889 BaseMutex* mutex = thread->GetHeldMutex(static_cast<LockLevel>(i)); 890 if (mutex != nullptr) { 891 os << " \"" << mutex->GetName() << "\""; 892 if (mutex->IsReaderWriterMutex()) { 893 ReaderWriterMutex* rw_mutex = down_cast<ReaderWriterMutex*>(mutex); 894 if (rw_mutex->GetExclusiveOwnerTid() == static_cast<uint64_t>(tid)) { 895 os << "(exclusive held)"; 896 } else { 897 os << "(shared held)"; 898 } 899 } 900 } 901 } 902 } 903 os << "\n"; 904 } 905} 906 907void Thread::DumpState(std::ostream& os) const { 908 Thread::DumpState(os, this, GetTid()); 909} 910 911struct StackDumpVisitor : public StackVisitor { 912 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 913 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 914 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 915 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 916 } 917 918 virtual ~StackDumpVisitor() { 919 if (frame_count == 0) { 920 os << " (no managed stack frames)\n"; 921 } 922 } 923 924 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 925 mirror::ArtMethod* m = GetMethod(); 926 if (m->IsRuntimeMethod()) { 927 return true; 928 } 929 const int kMaxRepetition = 3; 930 mirror::Class* c = m->GetDeclaringClass(); 931 mirror::DexCache* dex_cache = c->GetDexCache(); 932 int line_number = -1; 933 if (dex_cache != nullptr) { // be tolerant of bad input 934 const DexFile& dex_file = *dex_cache->GetDexFile(); 935 line_number = dex_file.GetLineNumFromPC(m, GetDexPc(false)); 936 } 937 if (line_number == last_line_number && last_method == m) { 938 ++repetition_count; 939 } else { 940 if (repetition_count >= kMaxRepetition) { 941 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 942 } 943 repetition_count = 0; 944 last_line_number = line_number; 945 last_method = m; 946 } 947 if (repetition_count < kMaxRepetition) { 948 os << " at " << PrettyMethod(m, false); 949 if (m->IsNative()) { 950 os << "(Native method)"; 951 } else { 952 const char* source_file(m->GetDeclaringClassSourceFile()); 953 os << "(" << (source_file != nullptr ? source_file : "unavailable") 954 << ":" << line_number << ")"; 955 } 956 os << "\n"; 957 if (frame_count == 0) { 958 Monitor::DescribeWait(os, thread); 959 } 960 if (can_allocate) { 961 Monitor::VisitLocks(this, DumpLockedObject, &os); 962 } 963 } 964 965 ++frame_count; 966 return true; 967 } 968 969 static void DumpLockedObject(mirror::Object* o, void* context) 970 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 971 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 972 os << " - locked "; 973 if (o == nullptr) { 974 os << "an unknown object"; 975 } else { 976 if ((o->GetLockWord(false).GetState() == LockWord::kThinLocked) && 977 Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 978 // Getting the identity hashcode here would result in lock inflation and suspension of the 979 // current thread, which isn't safe if this is the only runnable thread. 980 os << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", reinterpret_cast<intptr_t>(o), 981 PrettyTypeOf(o).c_str()); 982 } else { 983 os << StringPrintf("<0x%08x> (a %s)", o->IdentityHashCode(), PrettyTypeOf(o).c_str()); 984 } 985 } 986 os << "\n"; 987 } 988 989 std::ostream& os; 990 const Thread* thread; 991 const bool can_allocate; 992 mirror::ArtMethod* method; 993 mirror::ArtMethod* last_method; 994 int last_line_number; 995 int repetition_count; 996 int frame_count; 997}; 998 999static bool ShouldShowNativeStack(const Thread* thread) 1000 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1001 ThreadState state = thread->GetState(); 1002 1003 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 1004 if (state > kWaiting && state < kStarting) { 1005 return true; 1006 } 1007 1008 // In an Object.wait variant or Thread.sleep? That's not interesting. 1009 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 1010 return false; 1011 } 1012 1013 // In some other native method? That's interesting. 1014 // We don't just check kNative because native methods will be in state kSuspended if they're 1015 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 1016 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 1017 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 1018 return current_method != nullptr && current_method->IsNative(); 1019} 1020 1021void Thread::DumpJavaStack(std::ostream& os) const { 1022 std::unique_ptr<Context> context(Context::Create()); 1023 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), 1024 !tls32_.throwing_OutOfMemoryError); 1025 dumper.WalkStack(); 1026} 1027 1028void Thread::DumpStack(std::ostream& os) const { 1029 // TODO: we call this code when dying but may not have suspended the thread ourself. The 1030 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 1031 // the race with the thread_suspend_count_lock_). 1032 bool dump_for_abort = (gAborting > 0); 1033 bool safe_to_dump = (this == Thread::Current() || IsSuspended()); 1034 if (!kIsDebugBuild) { 1035 // We always want to dump the stack for an abort, however, there is no point dumping another 1036 // thread's stack in debug builds where we'll hit the not suspended check in the stack walk. 1037 safe_to_dump = (safe_to_dump || dump_for_abort); 1038 } 1039 if (safe_to_dump) { 1040 // If we're currently in native code, dump that stack before dumping the managed stack. 1041 if (dump_for_abort || ShouldShowNativeStack(this)) { 1042 DumpKernelStack(os, GetTid(), " kernel: ", false); 1043 DumpNativeStack(os, GetTid(), " native: ", GetCurrentMethod(nullptr)); 1044 } 1045 DumpJavaStack(os); 1046 } else { 1047 os << "Not able to dump stack of thread that isn't suspended"; 1048 } 1049} 1050 1051void Thread::ThreadExitCallback(void* arg) { 1052 Thread* self = reinterpret_cast<Thread*>(arg); 1053 if (self->tls32_.thread_exit_check_count == 0) { 1054 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's " 1055 "going to use a pthread_key_create destructor?): " << *self; 1056 CHECK(is_started_); 1057 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 1058 self->tls32_.thread_exit_check_count = 1; 1059 } else { 1060 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 1061 } 1062} 1063 1064void Thread::Startup() { 1065 CHECK(!is_started_); 1066 is_started_ = true; 1067 { 1068 // MutexLock to keep annotalysis happy. 1069 // 1070 // Note we use nullptr for the thread because Thread::Current can 1071 // return garbage since (is_started_ == true) and 1072 // Thread::pthread_key_self_ is not yet initialized. 1073 // This was seen on glibc. 1074 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 1075 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 1076 *Locks::thread_suspend_count_lock_); 1077 } 1078 1079 // Allocate a TLS slot. 1080 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 1081 1082 // Double-check the TLS slot allocation. 1083 if (pthread_getspecific(pthread_key_self_) != nullptr) { 1084 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 1085 } 1086} 1087 1088void Thread::FinishStartup() { 1089 Runtime* runtime = Runtime::Current(); 1090 CHECK(runtime->IsStarted()); 1091 1092 // Finish attaching the main thread. 1093 ScopedObjectAccess soa(Thread::Current()); 1094 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 1095 1096 Runtime::Current()->GetClassLinker()->RunRootClinits(); 1097} 1098 1099void Thread::Shutdown() { 1100 CHECK(is_started_); 1101 is_started_ = false; 1102 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 1103 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 1104 if (resume_cond_ != nullptr) { 1105 delete resume_cond_; 1106 resume_cond_ = nullptr; 1107 } 1108} 1109 1110Thread::Thread(bool daemon) : tls32_(daemon), wait_monitor_(nullptr), interrupted_(false) { 1111 wait_mutex_ = new Mutex("a thread wait mutex"); 1112 wait_cond_ = new ConditionVariable("a thread wait condition variable", *wait_mutex_); 1113 tlsPtr_.debug_invoke_req = new DebugInvokeReq; 1114 tlsPtr_.single_step_control = new SingleStepControl; 1115 tlsPtr_.instrumentation_stack = new std::deque<instrumentation::InstrumentationStackFrame>; 1116 tlsPtr_.name = new std::string(kThreadNameDuringStartup); 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 + gc::allocator::RosAlloc::kNumThreadLocalSizeBrackets, 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, uint32_t /*thread_id*/, 1159 RootType /*root_type*/) 1160 NO_THREAD_SAFETY_ANALYSIS { 1161 Thread* self = reinterpret_cast<Thread*>(arg); 1162 mirror::Object* entered_monitor = *object; 1163 if (self->HoldsLock(entered_monitor)) { 1164 LOG(WARNING) << "Calling MonitorExit on object " 1165 << object << " (" << PrettyTypeOf(entered_monitor) << ")" 1166 << " left locked by native thread " 1167 << *Thread::Current() << " which is detaching"; 1168 entered_monitor->MonitorExit(self); 1169 } 1170} 1171 1172void Thread::Destroy() { 1173 Thread* self = this; 1174 DCHECK_EQ(self, Thread::Current()); 1175 1176 if (tlsPtr_.opeer != nullptr) { 1177 ScopedObjectAccess soa(self); 1178 // We may need to call user-supplied managed code, do this before final clean-up. 1179 HandleUncaughtExceptions(soa); 1180 RemoveFromThreadGroup(soa); 1181 1182 // this.nativePeer = 0; 1183 if (Runtime::Current()->IsActiveTransaction()) { 1184 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1185 ->SetLong<true>(tlsPtr_.opeer, 0); 1186 } else { 1187 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer) 1188 ->SetLong<false>(tlsPtr_.opeer, 0); 1189 } 1190 Dbg::PostThreadDeath(self); 1191 1192 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1193 // who is waiting. 1194 mirror::Object* lock = 1195 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(tlsPtr_.opeer); 1196 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1197 if (lock != nullptr) { 1198 StackHandleScope<1> hs(self); 1199 Handle<mirror::Object> h_obj(hs.NewHandle(lock)); 1200 ObjectLock<mirror::Object> locker(self, h_obj); 1201 locker.NotifyAll(); 1202 } 1203 } 1204 1205 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1206 if (tlsPtr_.jni_env != nullptr) { 1207 tlsPtr_.jni_env->monitors.VisitRoots(MonitorExitVisitor, self, 0, kRootVMInternal); 1208 } 1209} 1210 1211Thread::~Thread() { 1212 if (tlsPtr_.jni_env != nullptr && tlsPtr_.jpeer != nullptr) { 1213 // If pthread_create fails we don't have a jni env here. 1214 tlsPtr_.jni_env->DeleteGlobalRef(tlsPtr_.jpeer); 1215 tlsPtr_.jpeer = nullptr; 1216 } 1217 tlsPtr_.opeer = nullptr; 1218 1219 bool initialized = (tlsPtr_.jni_env != nullptr); // Did Thread::Init run? 1220 if (initialized) { 1221 delete tlsPtr_.jni_env; 1222 tlsPtr_.jni_env = nullptr; 1223 } 1224 CHECK_NE(GetState(), kRunnable); 1225 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1226 CHECK(tlsPtr_.checkpoint_functions[0] == nullptr); 1227 CHECK(tlsPtr_.checkpoint_functions[1] == nullptr); 1228 CHECK(tlsPtr_.checkpoint_functions[2] == nullptr); 1229 1230 // We may be deleting a still born thread. 1231 SetStateUnsafe(kTerminated); 1232 1233 delete wait_cond_; 1234 delete wait_mutex_; 1235 1236 if (tlsPtr_.long_jump_context != nullptr) { 1237 delete tlsPtr_.long_jump_context; 1238 } 1239 1240 if (initialized) { 1241 CleanupCpu(); 1242 } 1243 1244 delete tlsPtr_.debug_invoke_req; 1245 delete tlsPtr_.single_step_control; 1246 delete tlsPtr_.instrumentation_stack; 1247 delete tlsPtr_.name; 1248 delete tlsPtr_.stack_trace_sample; 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, thread_id, kRootNativeStack); 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#undef QUICK_ENTRY_POINT_INFO 1947 1948 os << offset; 1949} 1950 1951void Thread::QuickDeliverException() { 1952 // Get exception from thread. 1953 ThrowLocation throw_location; 1954 mirror::Throwable* exception = GetException(&throw_location); 1955 CHECK(exception != nullptr); 1956 // Don't leave exception visible while we try to find the handler, which may cause class 1957 // resolution. 1958 bool is_exception_reported = IsExceptionReportedToInstrumentation(); 1959 ClearException(); 1960 bool is_deoptimization = (exception == GetDeoptimizationException()); 1961 QuickExceptionHandler exception_handler(this, is_deoptimization); 1962 if (is_deoptimization) { 1963 exception_handler.DeoptimizeStack(); 1964 } else { 1965 exception_handler.FindCatch(throw_location, exception, is_exception_reported); 1966 } 1967 exception_handler.UpdateInstrumentationStack(); 1968 exception_handler.DoLongJump(); 1969 LOG(FATAL) << "UNREACHABLE"; 1970} 1971 1972Context* Thread::GetLongJumpContext() { 1973 Context* result = tlsPtr_.long_jump_context; 1974 if (result == nullptr) { 1975 result = Context::Create(); 1976 } else { 1977 tlsPtr_.long_jump_context = nullptr; // Avoid context being shared. 1978 result->Reset(); 1979 } 1980 return result; 1981} 1982 1983struct CurrentMethodVisitor FINAL : public StackVisitor { 1984 CurrentMethodVisitor(Thread* thread, Context* context) 1985 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1986 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1987 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1988 mirror::ArtMethod* m = GetMethod(); 1989 if (m->IsRuntimeMethod()) { 1990 // Continue if this is a runtime method. 1991 return true; 1992 } 1993 if (context_ != nullptr) { 1994 this_object_ = GetThisObject(); 1995 } 1996 method_ = m; 1997 dex_pc_ = GetDexPc(); 1998 return false; 1999 } 2000 mirror::Object* this_object_; 2001 mirror::ArtMethod* method_; 2002 uint32_t dex_pc_; 2003}; 2004 2005mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 2006 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 2007 visitor.WalkStack(false); 2008 if (dex_pc != nullptr) { 2009 *dex_pc = visitor.dex_pc_; 2010 } 2011 return visitor.method_; 2012} 2013 2014ThrowLocation Thread::GetCurrentLocationForThrow() { 2015 Context* context = GetLongJumpContext(); 2016 CurrentMethodVisitor visitor(this, context); 2017 visitor.WalkStack(false); 2018 ReleaseLongJumpContext(context); 2019 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 2020} 2021 2022bool Thread::HoldsLock(mirror::Object* object) const { 2023 if (object == nullptr) { 2024 return false; 2025 } 2026 return object->GetLockOwnerThreadId() == GetThreadId(); 2027} 2028 2029// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 2030template <typename RootVisitor> 2031class ReferenceMapVisitor : public StackVisitor { 2032 public: 2033 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 2034 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2035 : StackVisitor(thread, context), visitor_(visitor) {} 2036 2037 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2038 if (false) { 2039 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 2040 << StringPrintf("@ PC:%04x", GetDexPc()); 2041 } 2042 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 2043 if (shadow_frame != nullptr) { 2044 VisitShadowFrame(shadow_frame); 2045 } else { 2046 VisitQuickFrame(); 2047 } 2048 return true; 2049 } 2050 2051 void VisitShadowFrame(ShadowFrame* shadow_frame) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2052 mirror::ArtMethod** method_addr = shadow_frame->GetMethodAddress(); 2053 visitor_(reinterpret_cast<mirror::Object**>(method_addr), 0 /*ignored*/, this); 2054 mirror::ArtMethod* m = *method_addr; 2055 DCHECK(m != nullptr); 2056 size_t num_regs = shadow_frame->NumberOfVRegs(); 2057 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 2058 // handle scope for JNI or References for interpreter. 2059 for (size_t reg = 0; reg < num_regs; ++reg) { 2060 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2061 if (ref != nullptr) { 2062 mirror::Object* new_ref = ref; 2063 visitor_(&new_ref, reg, this); 2064 if (new_ref != ref) { 2065 shadow_frame->SetVRegReference(reg, new_ref); 2066 } 2067 } 2068 } 2069 } else { 2070 // Java method. 2071 // Portable path use DexGcMap and store in Method.native_gc_map_. 2072 const uint8_t* gc_map = m->GetNativeGcMap(); 2073 CHECK(gc_map != nullptr) << PrettyMethod(m); 2074 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 2075 uint32_t dex_pc = shadow_frame->GetDexPC(); 2076 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 2077 DCHECK(reg_bitmap != nullptr); 2078 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 2079 for (size_t reg = 0; reg < num_regs; ++reg) { 2080 if (TestBitmap(reg, reg_bitmap)) { 2081 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 2082 if (ref != nullptr) { 2083 mirror::Object* new_ref = ref; 2084 visitor_(&new_ref, reg, this); 2085 if (new_ref != ref) { 2086 shadow_frame->SetVRegReference(reg, new_ref); 2087 } 2088 } 2089 } 2090 } 2091 } 2092 } 2093 2094 private: 2095 void VisitQuickFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2096 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2097 mirror::ArtMethod* m = cur_quick_frame->AsMirrorPtr(); 2098 mirror::ArtMethod* old_method = m; 2099 visitor_(reinterpret_cast<mirror::Object**>(&m), 0 /*ignored*/, this); 2100 if (m != old_method) { 2101 cur_quick_frame->Assign(m); 2102 } 2103 2104 // Process register map (which native and runtime methods don't have) 2105 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 2106 const uint8_t* native_gc_map = m->GetNativeGcMap(); 2107 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 2108 const DexFile::CodeItem* code_item = m->GetCodeItem(); 2109 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 2110 NativePcOffsetToReferenceMap map(native_gc_map); 2111 size_t num_regs = std::min(map.RegWidth() * 8, 2112 static_cast<size_t>(code_item->registers_size_)); 2113 if (num_regs > 0) { 2114 Runtime* runtime = Runtime::Current(); 2115 const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(m); 2116 uintptr_t native_pc_offset = m->NativePcOffset(GetCurrentQuickFramePc(), entry_point); 2117 const uint8_t* reg_bitmap = map.FindBitMap(native_pc_offset); 2118 DCHECK(reg_bitmap != nullptr); 2119 const void* code_pointer = mirror::ArtMethod::EntryPointToCodePointer(entry_point); 2120 const VmapTable vmap_table(m->GetVmapTable(code_pointer)); 2121 QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); 2122 // For all dex registers in the bitmap 2123 StackReference<mirror::ArtMethod>* cur_quick_frame = GetCurrentQuickFrame(); 2124 DCHECK(cur_quick_frame != nullptr); 2125 for (size_t reg = 0; reg < num_regs; ++reg) { 2126 // Does this register hold a reference? 2127 if (TestBitmap(reg, reg_bitmap)) { 2128 uint32_t vmap_offset; 2129 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 2130 int vmap_reg = vmap_table.ComputeRegister(frame_info.CoreSpillMask(), vmap_offset, 2131 kReferenceVReg); 2132 // This is sound as spilled GPRs will be word sized (ie 32 or 64bit). 2133 mirror::Object** ref_addr = reinterpret_cast<mirror::Object**>(GetGPRAddress(vmap_reg)); 2134 if (*ref_addr != nullptr) { 2135 visitor_(ref_addr, reg, this); 2136 } 2137 } else { 2138 StackReference<mirror::Object>* ref_addr = 2139 reinterpret_cast<StackReference<mirror::Object>*>( 2140 GetVRegAddr(cur_quick_frame, code_item, frame_info.CoreSpillMask(), 2141 frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), reg)); 2142 mirror::Object* ref = ref_addr->AsMirrorPtr(); 2143 if (ref != nullptr) { 2144 mirror::Object* new_ref = ref; 2145 visitor_(&new_ref, reg, this); 2146 if (ref != new_ref) { 2147 ref_addr->Assign(new_ref); 2148 } 2149 } 2150 } 2151 } 2152 } 2153 } 2154 } 2155 } 2156 2157 static bool TestBitmap(size_t reg, const uint8_t* reg_vector) { 2158 return ((reg_vector[reg / kBitsPerByte] >> (reg % kBitsPerByte)) & 0x01) != 0; 2159 } 2160 2161 // Visitor for when we visit a root. 2162 const RootVisitor& visitor_; 2163}; 2164 2165class RootCallbackVisitor { 2166 public: 2167 RootCallbackVisitor(RootCallback* callback, void* arg, uint32_t tid) 2168 : callback_(callback), arg_(arg), tid_(tid) {} 2169 2170 void operator()(mirror::Object** obj, size_t, const StackVisitor*) const { 2171 callback_(obj, arg_, tid_, kRootJavaFrame); 2172 } 2173 2174 private: 2175 RootCallback* const callback_; 2176 void* const arg_; 2177 const uint32_t tid_; 2178}; 2179 2180void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 2181 VerifyObject(class_loader_override); 2182 tlsPtr_.class_loader_override = class_loader_override; 2183} 2184 2185void Thread::VisitRoots(RootCallback* visitor, void* arg) { 2186 uint32_t thread_id = GetThreadId(); 2187 if (tlsPtr_.opeer != nullptr) { 2188 visitor(&tlsPtr_.opeer, arg, thread_id, kRootThreadObject); 2189 } 2190 if (tlsPtr_.exception != nullptr && tlsPtr_.exception != GetDeoptimizationException()) { 2191 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.exception), arg, thread_id, kRootNativeStack); 2192 } 2193 tlsPtr_.throw_location.VisitRoots(visitor, arg); 2194 if (tlsPtr_.class_loader_override != nullptr) { 2195 visitor(reinterpret_cast<mirror::Object**>(&tlsPtr_.class_loader_override), arg, thread_id, 2196 kRootNativeStack); 2197 } 2198 if (tlsPtr_.monitor_enter_object != nullptr) { 2199 visitor(&tlsPtr_.monitor_enter_object, arg, thread_id, kRootNativeStack); 2200 } 2201 tlsPtr_.jni_env->locals.VisitRoots(visitor, arg, thread_id, kRootJNILocal); 2202 tlsPtr_.jni_env->monitors.VisitRoots(visitor, arg, thread_id, kRootJNIMonitor); 2203 HandleScopeVisitRoots(visitor, arg, thread_id); 2204 if (tlsPtr_.debug_invoke_req != nullptr) { 2205 tlsPtr_.debug_invoke_req->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2206 } 2207 if (tlsPtr_.single_step_control != nullptr) { 2208 tlsPtr_.single_step_control->VisitRoots(visitor, arg, thread_id, kRootDebugger); 2209 } 2210 if (tlsPtr_.deoptimization_shadow_frame != nullptr) { 2211 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2212 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2213 for (ShadowFrame* shadow_frame = tlsPtr_.deoptimization_shadow_frame; shadow_frame != nullptr; 2214 shadow_frame = shadow_frame->GetLink()) { 2215 mapper.VisitShadowFrame(shadow_frame); 2216 } 2217 } 2218 if (tlsPtr_.shadow_frame_under_construction != nullptr) { 2219 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2220 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, nullptr, visitorToCallback); 2221 for (ShadowFrame* shadow_frame = tlsPtr_.shadow_frame_under_construction; 2222 shadow_frame != nullptr; 2223 shadow_frame = shadow_frame->GetLink()) { 2224 mapper.VisitShadowFrame(shadow_frame); 2225 } 2226 } 2227 // Visit roots on this thread's stack 2228 Context* context = GetLongJumpContext(); 2229 RootCallbackVisitor visitorToCallback(visitor, arg, thread_id); 2230 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 2231 mapper.WalkStack(); 2232 ReleaseLongJumpContext(context); 2233 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2234 if (frame.this_object_ != nullptr) { 2235 visitor(&frame.this_object_, arg, thread_id, kRootJavaFrame); 2236 } 2237 DCHECK(frame.method_ != nullptr); 2238 visitor(reinterpret_cast<mirror::Object**>(&frame.method_), arg, thread_id, kRootJavaFrame); 2239 } 2240} 2241 2242static void VerifyRoot(mirror::Object** root, void* /*arg*/, uint32_t /*thread_id*/, 2243 RootType /*root_type*/) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2244 VerifyObject(*root); 2245} 2246 2247void Thread::VerifyStackImpl() { 2248 std::unique_ptr<Context> context(Context::Create()); 2249 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap(), GetThreadId()); 2250 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2251 mapper.WalkStack(); 2252} 2253 2254// Set the stack end to that to be used during a stack overflow 2255void Thread::SetStackEndForStackOverflow() { 2256 // During stack overflow we allow use of the full stack. 2257 if (tlsPtr_.stack_end == tlsPtr_.stack_begin) { 2258 // However, we seem to have already extended to use the full stack. 2259 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2260 << kRuntimeStackOverflowReservedBytes << ")?"; 2261 DumpStack(LOG(ERROR)); 2262 LOG(FATAL) << "Recursive stack overflow."; 2263 } 2264 2265 tlsPtr_.stack_end = tlsPtr_.stack_begin; 2266} 2267 2268void Thread::SetTlab(byte* start, byte* end) { 2269 DCHECK_LE(start, end); 2270 tlsPtr_.thread_local_start = start; 2271 tlsPtr_.thread_local_pos = tlsPtr_.thread_local_start; 2272 tlsPtr_.thread_local_end = end; 2273 tlsPtr_.thread_local_objects = 0; 2274} 2275 2276bool Thread::HasTlab() const { 2277 bool has_tlab = tlsPtr_.thread_local_pos != nullptr; 2278 if (has_tlab) { 2279 DCHECK(tlsPtr_.thread_local_start != nullptr && tlsPtr_.thread_local_end != nullptr); 2280 } else { 2281 DCHECK(tlsPtr_.thread_local_start == nullptr && tlsPtr_.thread_local_end == nullptr); 2282 } 2283 return has_tlab; 2284} 2285 2286std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2287 thread.ShortDump(os); 2288 return os; 2289} 2290 2291} // namespace art 2292