thread.cc revision d45a1f5d1dd5bc9badfab3a8aee90c934d9f2227
1464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com/* 2464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * Copyright (C) 2011 The Android Open Source Project 3464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * 4464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * Licensed under the Apache License, Version 2.0 (the "License"); 5464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * you may not use this file except in compliance with the License. 6464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * You may obtain a copy of the License at 7464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * 8464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * http://www.apache.org/licenses/LICENSE-2.0 9464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * 10464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * Unless required by applicable law or agreed to in writing, software 11464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * distributed under the License is distributed on an "AS IS" BASIS, 12464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * See the License for the specific language governing permissions and 14464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com * limitations under the License. 15464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com */ 16464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 175af34fd773f8cfee82321393504f558ddf67c628arthurhsu@google.com#define ATRACE_TAG ATRACE_TAG_DALVIK 185af34fd773f8cfee82321393504f558ddf67c628arthurhsu@google.com 19464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "thread.h" 20333edd91cb32d6acfd0307ba2ae8f60baed75ff4arthurhsu@google.com 21333edd91cb32d6acfd0307ba2ae8f60baed75ff4arthurhsu@google.com#include <cutils/trace.h> 22464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include <pthread.h> 23246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com#include <signal.h> 24464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include <sys/resource.h> 25464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include <sys/time.h> 26464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 27464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include <algorithm> 28464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include <bitset> 29464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include <cerrno> 30464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include <iostream> 3144bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include <list> 3244bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com 3344bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "arch/context.h" 3444bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "base/mutex.h" 3544bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "catch_finder.h" 3644bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "class_linker.h" 3744bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "class_linker-inl.h" 3844bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "cutils/atomic.h" 3944bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "cutils/atomic-inline.h" 4044bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "debugger.h" 4144bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "dex_file-inl.h" 4244bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "entrypoints/entrypoint_utils.h" 4344bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "gc_map.h" 4444bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "gc/accounting/card_table-inl.h" 4544bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "gc/heap.h" 4644bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "gc/space/space.h" 4744bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "invoke_arg_array_builder.h" 4844bcb4a1475aeb0c4bce1cba0c30f5ee01eb50d9arthurhsu@google.com#include "jni_internal.h" 49464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "mirror/art_field-inl.h" 50464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "mirror/art_method-inl.h" 51464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "mirror/class-inl.h" 52464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "mirror/class_loader.h" 5332a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com#include "mirror/object_array-inl.h" 54464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "mirror/stack_trace_element.h" 55464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "monitor.h" 5632a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com#include "object_utils.h" 57246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com#include "reflection.h" 58464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "runtime.h" 5932a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com#include "scoped_thread_state_change.h" 6032a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com#include "ScopedLocalRef.h" 61464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "ScopedUtfChars.h" 62464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "sirt_ref.h" 63464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "stack.h" 64246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com#include "stack_indirect_reference_table.h" 65464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "thread-inl.h" 66464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "thread_list.h" 67464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "utils.h" 68464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "verifier/dex_gc_map.h" 69464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "vmap_table.h" 70464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#include "well_known_classes.h" 71464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 72246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.comnamespace art { 73464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 74464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.combool Thread::is_started_ = false; 7532a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.compthread_key_t Thread::pthread_key_self_; 76464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.comConditionVariable* Thread::resume_cond_ = nullptr; 77464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 78464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.comstatic const char* kThreadNameDuringStartup = "<native thread without managed peer>"; 79246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com 80464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.comvoid Thread::InitCardTable() { 81464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com card_table_ = Runtime::Current()->GetHeap()->GetCardTable()->GetBiasedBegin(); 8232a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com} 83464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 84464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#if !defined(__APPLE__) 85246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.comstatic void UnimplementedEntryPoint() { 86464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com UNIMPLEMENTED(FATAL); 8732a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com} 88246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com#endif 89464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 90464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.comvoid InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints, 91464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com PortableEntryPoints* ppoints, QuickEntryPoints* qpoints); 92464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 93464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.comvoid Thread::InitTlsEntryPoints() { 94464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#if !defined(__APPLE__) // The Mac GCC is too old to accept this code. 95464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com // Insert a placeholder so we can easily tell if we call an unimplemented entry point. 96464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com uintptr_t* begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 97464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com uintptr_t* end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(quick_entrypoints_)); 98464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com for (uintptr_t* it = begin; it != end; ++it) { 99464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 100464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com } 101464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com begin = reinterpret_cast<uintptr_t*>(&interpreter_entrypoints_); 102464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com end = reinterpret_cast<uintptr_t*>(reinterpret_cast<uint8_t*>(begin) + sizeof(portable_entrypoints_)); 103464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com for (uintptr_t* it = begin; it != end; ++it) { 104464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com *it = reinterpret_cast<uintptr_t>(UnimplementedEntryPoint); 105246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com } 106464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com#endif 107246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com InitEntryPoints(&interpreter_entrypoints_, &jni_entrypoints_, &portable_entrypoints_, 10832a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com &quick_entrypoints_); 10932a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com} 11032a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com 11132a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.comvoid ResetQuickAllocEntryPoints(QuickEntryPoints* qpoints); 11232a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com 113246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.comvoid Thread::ResetQuickAllocEntryPointsForThread() { 11432a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com ResetQuickAllocEntryPoints(&quick_entrypoints_); 115333edd91cb32d6acfd0307ba2ae8f60baed75ff4arthurhsu@google.com} 116333edd91cb32d6acfd0307ba2ae8f60baed75ff4arthurhsu@google.com 11732a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.comvoid Thread::SetDeoptimizationShadowFrame(ShadowFrame* sf) { 11832a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com deoptimization_shadow_frame_ = sf; 11932a01c7c6e7be46dda9bfc78de9ce32d99e4c8b7arthurhsu@google.com} 120246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com 121464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.comvoid Thread::SetDeoptimizationReturnValue(const JValue& ret_val) { 122333edd91cb32d6acfd0307ba2ae8f60baed75ff4arthurhsu@google.com deoptimization_return_value_.SetJ(ret_val.GetJ()); 123333edd91cb32d6acfd0307ba2ae8f60baed75ff4arthurhsu@google.com} 124246300f7fab1f2539c3207ce5ec28cc355465be8arthurhsu@google.com 125464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.comShadowFrame* Thread::GetAndClearDeoptimizationShadowFrame(JValue* ret_val) { 126464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com ShadowFrame* sf = deoptimization_shadow_frame_; 127464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com deoptimization_shadow_frame_ = nullptr; 128464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com ret_val->SetJ(deoptimization_return_value_.GetJ()); 129464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com return sf; 130464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com} 131464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com 132464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.comvoid Thread::InitTid() { 133464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com tid_ = ::art::GetTid(); 134464987db923362e596195f9eebd34fc508c9a41arthurhsu@google.com} 1355af34fd773f8cfee82321393504f558ddf67c628arthurhsu@google.com 136void Thread::InitAfterFork() { 137 // One thread (us) survived the fork, but we have a new tid so we need to 138 // update the value stashed in this Thread*. 139 InitTid(); 140} 141 142void* Thread::CreateCallback(void* arg) { 143 Thread* self = reinterpret_cast<Thread*>(arg); 144 Runtime* runtime = Runtime::Current(); 145 if (runtime == nullptr) { 146 LOG(ERROR) << "Thread attaching to non-existent runtime: " << *self; 147 return nullptr; 148 } 149 { 150 // TODO: pass self to MutexLock - requires self to equal Thread::Current(), which is only true 151 // after self->Init(). 152 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 153 // Check that if we got here we cannot be shutting down (as shutdown should never have started 154 // while threads are being born). 155 CHECK(!runtime->IsShuttingDownLocked()); 156 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 157 Runtime::Current()->EndThreadBirth(); 158 } 159 { 160 ScopedObjectAccess soa(self); 161 162 // Copy peer into self, deleting global reference when done. 163 CHECK(self->jpeer_ != nullptr); 164 self->opeer_ = soa.Decode<mirror::Object*>(self->jpeer_); 165 self->GetJniEnv()->DeleteGlobalRef(self->jpeer_); 166 self->jpeer_ = nullptr; 167 168 { 169 SirtRef<mirror::String> thread_name(self, self->GetThreadName(soa)); 170 self->SetThreadName(thread_name->ToModifiedUtf8().c_str()); 171 } 172 Dbg::PostThreadStart(self); 173 174 // Invoke the 'run' method of our java.lang.Thread. 175 mirror::Object* receiver = self->opeer_; 176 jmethodID mid = WellKnownClasses::java_lang_Thread_run; 177 mirror::ArtMethod* m = 178 receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(soa.DecodeMethod(mid)); 179 JValue result; 180 ArgArray arg_array(nullptr, 0); 181 arg_array.Append(reinterpret_cast<uint32_t>(receiver)); 182 m->Invoke(self, arg_array.GetArray(), arg_array.GetNumBytes(), &result, 'V'); 183 } 184 // Detach and delete self. 185 Runtime::Current()->GetThreadList()->Unregister(self); 186 187 return nullptr; 188} 189 190Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, 191 mirror::Object* thread_peer) { 192 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer); 193 Thread* result = reinterpret_cast<Thread*>(static_cast<uintptr_t>(f->GetInt(thread_peer))); 194 // Sanity check that if we have a result it is either suspended or we hold the thread_list_lock_ 195 // to stop it from going away. 196 if (kIsDebugBuild) { 197 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 198 if (result != nullptr && !result->IsSuspended()) { 199 Locks::thread_list_lock_->AssertHeld(soa.Self()); 200 } 201 } 202 return result; 203} 204 205Thread* Thread::FromManagedThread(const ScopedObjectAccessUnchecked& soa, jobject java_thread) { 206 return FromManagedThread(soa, soa.Decode<mirror::Object*>(java_thread)); 207} 208 209static size_t FixStackSize(size_t stack_size) { 210 // A stack size of zero means "use the default". 211 if (stack_size == 0) { 212 stack_size = Runtime::Current()->GetDefaultStackSize(); 213 } 214 215 // Dalvik used the bionic pthread default stack size for native threads, 216 // so include that here to support apps that expect large native stacks. 217 stack_size += 1 * MB; 218 219 // It's not possible to request a stack smaller than the system-defined PTHREAD_STACK_MIN. 220 if (stack_size < PTHREAD_STACK_MIN) { 221 stack_size = PTHREAD_STACK_MIN; 222 } 223 224 // It's likely that callers are trying to ensure they have at least a certain amount of 225 // stack space, so we should add our reserved space on top of what they requested, rather 226 // than implicitly take it away from them. 227 stack_size += Thread::kStackOverflowReservedBytes; 228 229 // Some systems require the stack size to be a multiple of the system page size, so round up. 230 stack_size = RoundUp(stack_size, kPageSize); 231 232 return stack_size; 233} 234 235void Thread::CreateNativeThread(JNIEnv* env, jobject java_peer, size_t stack_size, bool is_daemon) { 236 CHECK(java_peer != nullptr); 237 Thread* self = static_cast<JNIEnvExt*>(env)->self; 238 Runtime* runtime = Runtime::Current(); 239 240 // Atomically start the birth of the thread ensuring the runtime isn't shutting down. 241 bool thread_start_during_shutdown = false; 242 { 243 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 244 if (runtime->IsShuttingDownLocked()) { 245 thread_start_during_shutdown = true; 246 } else { 247 runtime->StartThreadBirth(); 248 } 249 } 250 if (thread_start_during_shutdown) { 251 ScopedLocalRef<jclass> error_class(env, env->FindClass("java/lang/InternalError")); 252 env->ThrowNew(error_class.get(), "Thread starting during runtime shutdown"); 253 return; 254 } 255 256 Thread* child_thread = new Thread(is_daemon); 257 // Use global JNI ref to hold peer live while child thread starts. 258 child_thread->jpeer_ = env->NewGlobalRef(java_peer); 259 stack_size = FixStackSize(stack_size); 260 261 // Thread.start is synchronized, so we know that nativePeer is 0, and know that we're not racing to 262 // assign it. 263 env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 264 reinterpret_cast<jint>(child_thread)); 265 266 pthread_t new_pthread; 267 pthread_attr_t attr; 268 CHECK_PTHREAD_CALL(pthread_attr_init, (&attr), "new thread"); 269 CHECK_PTHREAD_CALL(pthread_attr_setdetachstate, (&attr, PTHREAD_CREATE_DETACHED), "PTHREAD_CREATE_DETACHED"); 270 CHECK_PTHREAD_CALL(pthread_attr_setstacksize, (&attr, stack_size), stack_size); 271 int pthread_create_result = pthread_create(&new_pthread, &attr, Thread::CreateCallback, child_thread); 272 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&attr), "new thread"); 273 274 if (pthread_create_result != 0) { 275 // pthread_create(3) failed, so clean up. 276 { 277 MutexLock mu(self, *Locks::runtime_shutdown_lock_); 278 runtime->EndThreadBirth(); 279 } 280 // Manually delete the global reference since Thread::Init will not have been run. 281 env->DeleteGlobalRef(child_thread->jpeer_); 282 child_thread->jpeer_ = nullptr; 283 delete child_thread; 284 child_thread = nullptr; 285 // TODO: remove from thread group? 286 env->SetIntField(java_peer, WellKnownClasses::java_lang_Thread_nativePeer, 0); 287 { 288 std::string msg(StringPrintf("pthread_create (%s stack) failed: %s", 289 PrettySize(stack_size).c_str(), strerror(pthread_create_result))); 290 ScopedObjectAccess soa(env); 291 soa.Self()->ThrowOutOfMemoryError(msg.c_str()); 292 } 293 } 294} 295 296void Thread::Init(ThreadList* thread_list, JavaVMExt* java_vm) { 297 // This function does all the initialization that must be run by the native thread it applies to. 298 // (When we create a new thread from managed code, we allocate the Thread* in Thread::Create so 299 // we can handshake with the corresponding native thread when it's ready.) Check this native 300 // thread hasn't been through here already... 301 CHECK(Thread::Current() == nullptr); 302 SetUpAlternateSignalStack(); 303 InitCpu(); 304 InitTlsEntryPoints(); 305 InitCardTable(); 306 InitTid(); 307 // Set pthread_self_ ahead of pthread_setspecific, that makes Thread::Current function, this 308 // avoids pthread_self_ ever being invalid when discovered from Thread::Current(). 309 pthread_self_ = pthread_self(); 310 CHECK(is_started_); 311 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, this), "attach self"); 312 DCHECK_EQ(Thread::Current(), this); 313 314 thin_lock_thread_id_ = thread_list->AllocThreadId(this); 315 InitStackHwm(); 316 317 jni_env_ = new JNIEnvExt(this, java_vm); 318 thread_list->Register(this); 319} 320 321Thread* Thread::Attach(const char* thread_name, bool as_daemon, jobject thread_group, 322 bool create_peer) { 323 Thread* self; 324 Runtime* runtime = Runtime::Current(); 325 if (runtime == nullptr) { 326 LOG(ERROR) << "Thread attaching to non-existent runtime: " << thread_name; 327 return nullptr; 328 } 329 { 330 MutexLock mu(nullptr, *Locks::runtime_shutdown_lock_); 331 if (runtime->IsShuttingDownLocked()) { 332 LOG(ERROR) << "Thread attaching while runtime is shutting down: " << thread_name; 333 return nullptr; 334 } else { 335 Runtime::Current()->StartThreadBirth(); 336 self = new Thread(as_daemon); 337 self->Init(runtime->GetThreadList(), runtime->GetJavaVM()); 338 Runtime::Current()->EndThreadBirth(); 339 } 340 } 341 342 CHECK_NE(self->GetState(), kRunnable); 343 self->SetState(kNative); 344 345 // If we're the main thread, ClassLinker won't be created until after we're attached, 346 // so that thread needs a two-stage attach. Regular threads don't need this hack. 347 // In the compiler, all threads need this hack, because no-one's going to be getting 348 // a native peer! 349 if (create_peer) { 350 self->CreatePeer(thread_name, as_daemon, thread_group); 351 } else { 352 // These aren't necessary, but they improve diagnostics for unit tests & command-line tools. 353 if (thread_name != nullptr) { 354 self->name_->assign(thread_name); 355 ::art::SetThreadName(thread_name); 356 } 357 } 358 359 return self; 360} 361 362void Thread::CreatePeer(const char* name, bool as_daemon, jobject thread_group) { 363 Runtime* runtime = Runtime::Current(); 364 CHECK(runtime->IsStarted()); 365 JNIEnv* env = jni_env_; 366 367 if (thread_group == nullptr) { 368 thread_group = runtime->GetMainThreadGroup(); 369 } 370 ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF(name)); 371 jint thread_priority = GetNativePriority(); 372 jboolean thread_is_daemon = as_daemon; 373 374 ScopedLocalRef<jobject> peer(env, env->AllocObject(WellKnownClasses::java_lang_Thread)); 375 if (peer.get() == nullptr) { 376 CHECK(IsExceptionPending()); 377 return; 378 } 379 { 380 ScopedObjectAccess soa(this); 381 opeer_ = soa.Decode<mirror::Object*>(peer.get()); 382 } 383 env->CallNonvirtualVoidMethod(peer.get(), 384 WellKnownClasses::java_lang_Thread, 385 WellKnownClasses::java_lang_Thread_init, 386 thread_group, thread_name.get(), thread_priority, thread_is_daemon); 387 AssertNoPendingException(); 388 389 Thread* self = this; 390 DCHECK_EQ(self, Thread::Current()); 391 jni_env_->SetIntField(peer.get(), WellKnownClasses::java_lang_Thread_nativePeer, 392 reinterpret_cast<jint>(self)); 393 394 ScopedObjectAccess soa(self); 395 SirtRef<mirror::String> peer_thread_name(soa.Self(), GetThreadName(soa)); 396 if (peer_thread_name.get() == nullptr) { 397 // The Thread constructor should have set the Thread.name to a 398 // non-null value. However, because we can run without code 399 // available (in the compiler, in tests), we manually assign the 400 // fields the constructor should have set. 401 soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)-> 402 SetBoolean(opeer_, thread_is_daemon); 403 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)-> 404 SetObject(opeer_, soa.Decode<mirror::Object*>(thread_group)); 405 soa.DecodeField(WellKnownClasses::java_lang_Thread_name)-> 406 SetObject(opeer_, soa.Decode<mirror::Object*>(thread_name.get())); 407 soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)-> 408 SetInt(opeer_, thread_priority); 409 peer_thread_name.reset(GetThreadName(soa)); 410 } 411 // 'thread_name' may have been null, so don't trust 'peer_thread_name' to be non-null. 412 if (peer_thread_name.get() != nullptr) { 413 SetThreadName(peer_thread_name->ToModifiedUtf8().c_str()); 414 } 415} 416 417void Thread::SetThreadName(const char* name) { 418 name_->assign(name); 419 ::art::SetThreadName(name); 420 Dbg::DdmSendThreadNotification(this, CHUNK_TYPE("THNM")); 421} 422 423void Thread::InitStackHwm() { 424 void* stack_base; 425 size_t stack_size; 426 GetThreadStack(pthread_self_, &stack_base, &stack_size); 427 428 // TODO: include this in the thread dumps; potentially useful in SIGQUIT output? 429 VLOG(threads) << StringPrintf("Native stack is at %p (%s)", stack_base, PrettySize(stack_size).c_str()); 430 431 stack_begin_ = reinterpret_cast<byte*>(stack_base); 432 stack_size_ = stack_size; 433 434 if (stack_size_ <= kStackOverflowReservedBytes) { 435 LOG(FATAL) << "Attempt to attach a thread with a too-small stack (" << stack_size_ << " bytes)"; 436 } 437 438 // TODO: move this into the Linux GetThreadStack implementation. 439#if !defined(__APPLE__) 440 // If we're the main thread, check whether we were run with an unlimited stack. In that case, 441 // glibc will have reported a 2GB stack for our 32-bit process, and our stack overflow detection 442 // will be broken because we'll die long before we get close to 2GB. 443 bool is_main_thread = (::art::GetTid() == getpid()); 444 if (is_main_thread) { 445 rlimit stack_limit; 446 if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) { 447 PLOG(FATAL) << "getrlimit(RLIMIT_STACK) failed"; 448 } 449 if (stack_limit.rlim_cur == RLIM_INFINITY) { 450 // Find the default stack size for new threads... 451 pthread_attr_t default_attributes; 452 size_t default_stack_size; 453 CHECK_PTHREAD_CALL(pthread_attr_init, (&default_attributes), "default stack size query"); 454 CHECK_PTHREAD_CALL(pthread_attr_getstacksize, (&default_attributes, &default_stack_size), 455 "default stack size query"); 456 CHECK_PTHREAD_CALL(pthread_attr_destroy, (&default_attributes), "default stack size query"); 457 458 // ...and use that as our limit. 459 size_t old_stack_size = stack_size_; 460 stack_size_ = default_stack_size; 461 stack_begin_ += (old_stack_size - stack_size_); 462 VLOG(threads) << "Limiting unlimited stack (reported as " << PrettySize(old_stack_size) << ")" 463 << " to " << PrettySize(stack_size_) 464 << " with base " << reinterpret_cast<void*>(stack_begin_); 465 } 466 } 467#endif 468 469 // Set stack_end_ to the bottom of the stack saving space of stack overflows 470 ResetDefaultStackEnd(); 471 472 // Sanity check. 473 int stack_variable; 474 CHECK_GT(&stack_variable, reinterpret_cast<void*>(stack_end_)); 475} 476 477void Thread::ShortDump(std::ostream& os) const { 478 os << "Thread["; 479 if (GetThreadId() != 0) { 480 // If we're in kStarting, we won't have a thin lock id or tid yet. 481 os << GetThreadId() 482 << ",tid=" << GetTid() << ','; 483 } 484 os << GetState() 485 << ",Thread*=" << this 486 << ",peer=" << opeer_ 487 << ",\"" << *name_ << "\"" 488 << "]"; 489} 490 491void Thread::Dump(std::ostream& os) const { 492 DumpState(os); 493 DumpStack(os); 494} 495 496mirror::String* Thread::GetThreadName(const ScopedObjectAccessUnchecked& soa) const { 497 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 498 return (opeer_ != nullptr) ? reinterpret_cast<mirror::String*>(f->GetObject(opeer_)) : nullptr; 499} 500 501void Thread::GetThreadName(std::string& name) const { 502 name.assign(*name_); 503} 504 505uint64_t Thread::GetCpuMicroTime() const { 506#if defined(HAVE_POSIX_CLOCKS) 507 clockid_t cpu_clock_id; 508 pthread_getcpuclockid(pthread_self_, &cpu_clock_id); 509 timespec now; 510 clock_gettime(cpu_clock_id, &now); 511 return static_cast<uint64_t>(now.tv_sec) * 1000000LL + now.tv_nsec / 1000LL; 512#else 513 UNIMPLEMENTED(WARNING); 514 return -1; 515#endif 516} 517 518void Thread::AtomicSetFlag(ThreadFlag flag) { 519 android_atomic_or(flag, &state_and_flags_.as_int); 520} 521 522void Thread::AtomicClearFlag(ThreadFlag flag) { 523 android_atomic_and(-1 ^ flag, &state_and_flags_.as_int); 524} 525 526// Attempt to rectify locks so that we dump thread list with required locks before exiting. 527static void UnsafeLogFatalForSuspendCount(Thread* self, Thread* thread) NO_THREAD_SAFETY_ANALYSIS { 528 LOG(ERROR) << *thread << " suspend count already zero."; 529 Locks::thread_suspend_count_lock_->Unlock(self); 530 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 531 Locks::mutator_lock_->SharedTryLock(self); 532 if (!Locks::mutator_lock_->IsSharedHeld(self)) { 533 LOG(WARNING) << "Dumping thread list without holding mutator_lock_"; 534 } 535 } 536 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 537 Locks::thread_list_lock_->TryLock(self); 538 if (!Locks::thread_list_lock_->IsExclusiveHeld(self)) { 539 LOG(WARNING) << "Dumping thread list without holding thread_list_lock_"; 540 } 541 } 542 std::ostringstream ss; 543 Runtime::Current()->GetThreadList()->DumpLocked(ss); 544 LOG(FATAL) << ss.str(); 545} 546 547void Thread::ModifySuspendCount(Thread* self, int delta, bool for_debugger) { 548 DCHECK(delta == -1 || delta == +1 || delta == -debug_suspend_count_) 549 << delta << " " << debug_suspend_count_ << " " << this; 550 DCHECK_GE(suspend_count_, debug_suspend_count_) << this; 551 Locks::thread_suspend_count_lock_->AssertHeld(self); 552 if (this != self && !IsSuspended()) { 553 Locks::thread_list_lock_->AssertHeld(self); 554 } 555 if (UNLIKELY(delta < 0 && suspend_count_ <= 0)) { 556 UnsafeLogFatalForSuspendCount(self, this); 557 return; 558 } 559 560 suspend_count_ += delta; 561 if (for_debugger) { 562 debug_suspend_count_ += delta; 563 } 564 565 if (suspend_count_ == 0) { 566 AtomicClearFlag(kSuspendRequest); 567 } else { 568 AtomicSetFlag(kSuspendRequest); 569 } 570} 571 572void Thread::RunCheckpointFunction() { 573 Closure *checkpoints[kMaxCheckpoints]; 574 575 // Grab the suspend_count lock and copy the current set of 576 // checkpoints. Then clear the list and the flag. The RequestCheckpoint 577 // function will also grab this lock so we prevent a race between setting 578 // the kCheckpointRequest flag and clearing it. 579 { 580 MutexLock mu(this, *Locks::thread_suspend_count_lock_); 581 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 582 checkpoints[i] = checkpoint_functions_[i]; 583 checkpoint_functions_[i] = nullptr; 584 } 585 AtomicClearFlag(kCheckpointRequest); 586 } 587 588 // Outside the lock, run all the checkpoint functions that 589 // we collected. 590 bool found_checkpoint = false; 591 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 592 if (checkpoints[i] != nullptr) { 593 ATRACE_BEGIN("Checkpoint function"); 594 checkpoints[i]->Run(this); 595 ATRACE_END(); 596 found_checkpoint = true; 597 } 598 } 599 CHECK(found_checkpoint); 600} 601 602bool Thread::RequestCheckpoint(Closure* function) { 603 union StateAndFlags old_state_and_flags; 604 old_state_and_flags.as_int = state_and_flags_.as_int; 605 if (old_state_and_flags.as_struct.state != kRunnable) { 606 return false; // Fail, thread is suspended and so can't run a checkpoint. 607 } 608 609 uint32_t available_checkpoint = kMaxCheckpoints; 610 for (uint32_t i = 0 ; i < kMaxCheckpoints; ++i) { 611 if (checkpoint_functions_[i] == nullptr) { 612 available_checkpoint = i; 613 break; 614 } 615 } 616 if (available_checkpoint == kMaxCheckpoints) { 617 // No checkpoint functions available, we can't run a checkpoint 618 return false; 619 } 620 checkpoint_functions_[available_checkpoint] = function; 621 622 // Checkpoint function installed now install flag bit. 623 // We must be runnable to request a checkpoint. 624 DCHECK_EQ(old_state_and_flags.as_struct.state, kRunnable); 625 union StateAndFlags new_state_and_flags; 626 new_state_and_flags.as_int = old_state_and_flags.as_int; 627 new_state_and_flags.as_struct.flags |= kCheckpointRequest; 628 int succeeded = android_atomic_acquire_cas(old_state_and_flags.as_int, new_state_and_flags.as_int, 629 &state_and_flags_.as_int); 630 if (UNLIKELY(succeeded != 0)) { 631 // The thread changed state before the checkpoint was installed. 632 CHECK_EQ(checkpoint_functions_[available_checkpoint], function); 633 checkpoint_functions_[available_checkpoint] = nullptr; 634 } else { 635 CHECK_EQ(ReadFlag(kCheckpointRequest), true); 636 } 637 return succeeded == 0; 638} 639 640void Thread::FullSuspendCheck() { 641 VLOG(threads) << this << " self-suspending"; 642 ATRACE_BEGIN("Full suspend check"); 643 // Make thread appear suspended to other threads, release mutator_lock_. 644 TransitionFromRunnableToSuspended(kSuspended); 645 // Transition back to runnable noting requests to suspend, re-acquire share on mutator_lock_. 646 TransitionFromSuspendedToRunnable(); 647 ATRACE_END(); 648 VLOG(threads) << this << " self-reviving"; 649} 650 651void Thread::DumpState(std::ostream& os, const Thread* thread, pid_t tid) { 652 std::string group_name; 653 int priority; 654 bool is_daemon = false; 655 Thread* self = Thread::Current(); 656 657 if (self != nullptr && thread != nullptr && thread->opeer_ != nullptr) { 658 ScopedObjectAccessUnchecked soa(self); 659 priority = soa.DecodeField(WellKnownClasses::java_lang_Thread_priority)->GetInt(thread->opeer_); 660 is_daemon = soa.DecodeField(WellKnownClasses::java_lang_Thread_daemon)->GetBoolean(thread->opeer_); 661 662 mirror::Object* thread_group = 663 soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(thread->opeer_); 664 665 if (thread_group != nullptr) { 666 mirror::ArtField* group_name_field = 667 soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 668 mirror::String* group_name_string = 669 reinterpret_cast<mirror::String*>(group_name_field->GetObject(thread_group)); 670 group_name = (group_name_string != nullptr) ? group_name_string->ToModifiedUtf8() : "<null>"; 671 } 672 } else { 673 priority = GetNativePriority(); 674 } 675 676 std::string scheduler_group_name(GetSchedulerGroupName(tid)); 677 if (scheduler_group_name.empty()) { 678 scheduler_group_name = "default"; 679 } 680 681 if (thread != nullptr) { 682 os << '"' << *thread->name_ << '"'; 683 if (is_daemon) { 684 os << " daemon"; 685 } 686 os << " prio=" << priority 687 << " tid=" << thread->GetThreadId() 688 << " " << thread->GetState(); 689 if (thread->IsStillStarting()) { 690 os << " (still starting up)"; 691 } 692 os << "\n"; 693 } else { 694 os << '"' << ::art::GetThreadName(tid) << '"' 695 << " prio=" << priority 696 << " (not attached)\n"; 697 } 698 699 if (thread != nullptr) { 700 MutexLock mu(self, *Locks::thread_suspend_count_lock_); 701 os << " | group=\"" << group_name << "\"" 702 << " sCount=" << thread->suspend_count_ 703 << " dsCount=" << thread->debug_suspend_count_ 704 << " obj=" << reinterpret_cast<void*>(thread->opeer_) 705 << " self=" << reinterpret_cast<const void*>(thread) << "\n"; 706 } 707 708 os << " | sysTid=" << tid 709 << " nice=" << getpriority(PRIO_PROCESS, tid) 710 << " cgrp=" << scheduler_group_name; 711 if (thread != nullptr) { 712 int policy; 713 sched_param sp; 714 CHECK_PTHREAD_CALL(pthread_getschedparam, (thread->pthread_self_, &policy, &sp), __FUNCTION__); 715 os << " sched=" << policy << "/" << sp.sched_priority 716 << " handle=" << reinterpret_cast<void*>(thread->pthread_self_); 717 } 718 os << "\n"; 719 720 // Grab the scheduler stats for this thread. 721 std::string scheduler_stats; 722 if (ReadFileToString(StringPrintf("/proc/self/task/%d/schedstat", tid), &scheduler_stats)) { 723 scheduler_stats.resize(scheduler_stats.size() - 1); // Lose the trailing '\n'. 724 } else { 725 scheduler_stats = "0 0 0"; 726 } 727 728 char native_thread_state = '?'; 729 int utime = 0; 730 int stime = 0; 731 int task_cpu = 0; 732 GetTaskStats(tid, &native_thread_state, &utime, &stime, &task_cpu); 733 734 os << " | state=" << native_thread_state 735 << " schedstat=( " << scheduler_stats << " )" 736 << " utm=" << utime 737 << " stm=" << stime 738 << " core=" << task_cpu 739 << " HZ=" << sysconf(_SC_CLK_TCK) << "\n"; 740 if (thread != nullptr) { 741 os << " | stack=" << reinterpret_cast<void*>(thread->stack_begin_) << "-" << reinterpret_cast<void*>(thread->stack_end_) 742 << " stackSize=" << PrettySize(thread->stack_size_) << "\n"; 743 } 744} 745 746void Thread::DumpState(std::ostream& os) const { 747 Thread::DumpState(os, this, GetTid()); 748} 749 750struct StackDumpVisitor : public StackVisitor { 751 StackDumpVisitor(std::ostream& os, Thread* thread, Context* context, bool can_allocate) 752 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 753 : StackVisitor(thread, context), os(os), thread(thread), can_allocate(can_allocate), 754 last_method(nullptr), last_line_number(0), repetition_count(0), frame_count(0) { 755 } 756 757 virtual ~StackDumpVisitor() { 758 if (frame_count == 0) { 759 os << " (no managed stack frames)\n"; 760 } 761 } 762 763 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 764 mirror::ArtMethod* m = GetMethod(); 765 if (m->IsRuntimeMethod()) { 766 return true; 767 } 768 const int kMaxRepetition = 3; 769 mirror::Class* c = m->GetDeclaringClass(); 770 const mirror::DexCache* dex_cache = c->GetDexCache(); 771 int line_number = -1; 772 if (dex_cache != nullptr) { // be tolerant of bad input 773 const DexFile& dex_file = *dex_cache->GetDexFile(); 774 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 775 } 776 if (line_number == last_line_number && last_method == m) { 777 ++repetition_count; 778 } else { 779 if (repetition_count >= kMaxRepetition) { 780 os << " ... repeated " << (repetition_count - kMaxRepetition) << " times\n"; 781 } 782 repetition_count = 0; 783 last_line_number = line_number; 784 last_method = m; 785 } 786 if (repetition_count < kMaxRepetition) { 787 os << " at " << PrettyMethod(m, false); 788 if (m->IsNative()) { 789 os << "(Native method)"; 790 } else { 791 mh.ChangeMethod(m); 792 const char* source_file(mh.GetDeclaringClassSourceFile()); 793 os << "(" << (source_file != nullptr ? source_file : "unavailable") 794 << ":" << line_number << ")"; 795 } 796 os << "\n"; 797 if (frame_count == 0) { 798 Monitor::DescribeWait(os, thread); 799 } 800 if (can_allocate) { 801 Monitor::VisitLocks(this, DumpLockedObject, &os); 802 } 803 } 804 805 ++frame_count; 806 return true; 807 } 808 809 static void DumpLockedObject(mirror::Object* o, void* context) 810 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 811 std::ostream& os = *reinterpret_cast<std::ostream*>(context); 812 os << " - locked <" << o << "> (a " << PrettyTypeOf(o) << ")\n"; 813 } 814 815 std::ostream& os; 816 const Thread* thread; 817 const bool can_allocate; 818 MethodHelper mh; 819 mirror::ArtMethod* last_method; 820 int last_line_number; 821 int repetition_count; 822 int frame_count; 823}; 824 825static bool ShouldShowNativeStack(const Thread* thread) 826 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 827 ThreadState state = thread->GetState(); 828 829 // In native code somewhere in the VM (one of the kWaitingFor* states)? That's interesting. 830 if (state > kWaiting && state < kStarting) { 831 return true; 832 } 833 834 // In an Object.wait variant or Thread.sleep? That's not interesting. 835 if (state == kTimedWaiting || state == kSleeping || state == kWaiting) { 836 return false; 837 } 838 839 // In some other native method? That's interesting. 840 // We don't just check kNative because native methods will be in state kSuspended if they're 841 // calling back into the VM, or kBlocked if they're blocked on a monitor, or one of the 842 // thread-startup states if it's early enough in their life cycle (http://b/7432159). 843 mirror::ArtMethod* current_method = thread->GetCurrentMethod(nullptr); 844 return current_method != nullptr && current_method->IsNative(); 845} 846 847void Thread::DumpStack(std::ostream& os) const { 848 // TODO: we call this code when dying but may not have suspended the thread ourself. The 849 // IsSuspended check is therefore racy with the use for dumping (normally we inhibit 850 // the race with the thread_suspend_count_lock_). 851 // No point dumping for an abort in debug builds where we'll hit the not suspended check in stack. 852 bool dump_for_abort = (gAborting > 0) && !kIsDebugBuild; 853 if (this == Thread::Current() || IsSuspended() || dump_for_abort) { 854 // If we're currently in native code, dump that stack before dumping the managed stack. 855 if (dump_for_abort || ShouldShowNativeStack(this)) { 856 DumpKernelStack(os, GetTid(), " kernel: ", false); 857 DumpNativeStack(os, GetTid(), " native: ", false); 858 } 859 UniquePtr<Context> context(Context::Create()); 860 StackDumpVisitor dumper(os, const_cast<Thread*>(this), context.get(), !throwing_OutOfMemoryError_); 861 dumper.WalkStack(); 862 } else { 863 os << "Not able to dump stack of thread that isn't suspended"; 864 } 865} 866 867void Thread::ThreadExitCallback(void* arg) { 868 Thread* self = reinterpret_cast<Thread*>(arg); 869 if (self->thread_exit_check_count_ == 0) { 870 LOG(WARNING) << "Native thread exiting without having called DetachCurrentThread (maybe it's going to use a pthread_key_create destructor?): " << *self; 871 CHECK(is_started_); 872 CHECK_PTHREAD_CALL(pthread_setspecific, (Thread::pthread_key_self_, self), "reattach self"); 873 self->thread_exit_check_count_ = 1; 874 } else { 875 LOG(FATAL) << "Native thread exited without calling DetachCurrentThread: " << *self; 876 } 877} 878 879void Thread::Startup() { 880 CHECK(!is_started_); 881 is_started_ = true; 882 { 883 // MutexLock to keep annotalysis happy. 884 // 885 // Note we use nullptr for the thread because Thread::Current can 886 // return garbage since (is_started_ == true) and 887 // Thread::pthread_key_self_ is not yet initialized. 888 // This was seen on glibc. 889 MutexLock mu(nullptr, *Locks::thread_suspend_count_lock_); 890 resume_cond_ = new ConditionVariable("Thread resumption condition variable", 891 *Locks::thread_suspend_count_lock_); 892 } 893 894 // Allocate a TLS slot. 895 CHECK_PTHREAD_CALL(pthread_key_create, (&Thread::pthread_key_self_, Thread::ThreadExitCallback), "self key"); 896 897 // Double-check the TLS slot allocation. 898 if (pthread_getspecific(pthread_key_self_) != nullptr) { 899 LOG(FATAL) << "Newly-created pthread TLS slot is not nullptr"; 900 } 901} 902 903void Thread::FinishStartup() { 904 Runtime* runtime = Runtime::Current(); 905 CHECK(runtime->IsStarted()); 906 907 // Finish attaching the main thread. 908 ScopedObjectAccess soa(Thread::Current()); 909 Thread::Current()->CreatePeer("main", false, runtime->GetMainThreadGroup()); 910 911 Runtime::Current()->GetClassLinker()->RunRootClinits(); 912} 913 914void Thread::Shutdown() { 915 CHECK(is_started_); 916 is_started_ = false; 917 CHECK_PTHREAD_CALL(pthread_key_delete, (Thread::pthread_key_self_), "self key"); 918 MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_); 919 if (resume_cond_ != nullptr) { 920 delete resume_cond_; 921 resume_cond_ = nullptr; 922 } 923} 924 925Thread::Thread(bool daemon) 926 : suspend_count_(0), 927 card_table_(nullptr), 928 exception_(nullptr), 929 stack_end_(nullptr), 930 managed_stack_(), 931 jni_env_(nullptr), 932 self_(nullptr), 933 opeer_(nullptr), 934 jpeer_(nullptr), 935 stack_begin_(nullptr), 936 stack_size_(0), 937 thin_lock_thread_id_(0), 938 stack_trace_sample_(nullptr), 939 trace_clock_base_(0), 940 tid_(0), 941 wait_mutex_(new Mutex("a thread wait mutex")), 942 wait_cond_(new ConditionVariable("a thread wait condition variable", *wait_mutex_)), 943 wait_monitor_(nullptr), 944 interrupted_(false), 945 wait_next_(nullptr), 946 monitor_enter_object_(nullptr), 947 top_sirt_(nullptr), 948 runtime_(nullptr), 949 class_loader_override_(nullptr), 950 long_jump_context_(nullptr), 951 throwing_OutOfMemoryError_(false), 952 debug_suspend_count_(0), 953 debug_invoke_req_(new DebugInvokeReq), 954 single_step_control_(new SingleStepControl), 955 deoptimization_shadow_frame_(nullptr), 956 instrumentation_stack_(new std::deque<instrumentation::InstrumentationStackFrame>), 957 name_(new std::string(kThreadNameDuringStartup)), 958 daemon_(daemon), 959 pthread_self_(0), 960 no_thread_suspension_(0), 961 last_no_thread_suspension_cause_(nullptr), 962 thread_exit_check_count_(0), 963 thread_local_start_(nullptr), 964 thread_local_pos_(nullptr), 965 thread_local_end_(nullptr), 966 thread_local_objects_(0) { 967 CHECK_EQ((sizeof(Thread) % 4), 0U) << sizeof(Thread); 968 state_and_flags_.as_struct.flags = 0; 969 state_and_flags_.as_struct.state = kNative; 970 memset(&held_mutexes_[0], 0, sizeof(held_mutexes_)); 971 memset(rosalloc_runs_, 0, sizeof(rosalloc_runs_)); 972 for (uint32_t i = 0; i < kMaxCheckpoints; ++i) { 973 checkpoint_functions_[i] = nullptr; 974 } 975} 976 977bool Thread::IsStillStarting() const { 978 // You might think you can check whether the state is kStarting, but for much of thread startup, 979 // the thread is in kNative; it might also be in kVmWait. 980 // You might think you can check whether the peer is nullptr, but the peer is actually created and 981 // assigned fairly early on, and needs to be. 982 // It turns out that the last thing to change is the thread name; that's a good proxy for "has 983 // this thread _ever_ entered kRunnable". 984 return (jpeer_ == nullptr && opeer_ == nullptr) || (*name_ == kThreadNameDuringStartup); 985} 986 987void Thread::AssertNoPendingException() const { 988 if (UNLIKELY(IsExceptionPending())) { 989 ScopedObjectAccess soa(Thread::Current()); 990 mirror::Throwable* exception = GetException(nullptr); 991 LOG(FATAL) << "No pending exception expected: " << exception->Dump(); 992 } 993} 994 995static mirror::Object* MonitorExitVisitor(mirror::Object* object, void* arg) 996 NO_THREAD_SAFETY_ANALYSIS { 997 Thread* self = reinterpret_cast<Thread*>(arg); 998 mirror::Object* entered_monitor = object; 999 if (self->HoldsLock(entered_monitor)) { 1000 LOG(WARNING) << "Calling MonitorExit on object " 1001 << object << " (" << PrettyTypeOf(object) << ")" 1002 << " left locked by native thread " 1003 << *Thread::Current() << " which is detaching"; 1004 entered_monitor->MonitorExit(self); 1005 } 1006 return object; 1007} 1008 1009void Thread::Destroy() { 1010 Thread* self = this; 1011 DCHECK_EQ(self, Thread::Current()); 1012 1013 if (opeer_ != nullptr) { 1014 ScopedObjectAccess soa(self); 1015 // We may need to call user-supplied managed code, do this before final clean-up. 1016 HandleUncaughtExceptions(soa); 1017 RemoveFromThreadGroup(soa); 1018 1019 // this.nativePeer = 0; 1020 soa.DecodeField(WellKnownClasses::java_lang_Thread_nativePeer)->SetInt(opeer_, 0); 1021 Dbg::PostThreadDeath(self); 1022 1023 // Thread.join() is implemented as an Object.wait() on the Thread.lock object. Signal anyone 1024 // who is waiting. 1025 mirror::Object* lock = 1026 soa.DecodeField(WellKnownClasses::java_lang_Thread_lock)->GetObject(opeer_); 1027 // (This conditional is only needed for tests, where Thread.lock won't have been set.) 1028 if (lock != nullptr) { 1029 SirtRef<mirror::Object> sirt_obj(self, lock); 1030 ObjectLock<mirror::Object> locker(self, &sirt_obj); 1031 locker.Notify(); 1032 } 1033 } 1034 1035 // On thread detach, all monitors entered with JNI MonitorEnter are automatically exited. 1036 if (jni_env_ != nullptr) { 1037 jni_env_->monitors.VisitRoots(MonitorExitVisitor, self); 1038 } 1039} 1040 1041Thread::~Thread() { 1042 if (jni_env_ != nullptr && jpeer_ != nullptr) { 1043 // If pthread_create fails we don't have a jni env here. 1044 jni_env_->DeleteGlobalRef(jpeer_); 1045 jpeer_ = nullptr; 1046 } 1047 opeer_ = nullptr; 1048 1049 delete jni_env_; 1050 jni_env_ = nullptr; 1051 1052 CHECK_NE(GetState(), kRunnable); 1053 CHECK_NE(ReadFlag(kCheckpointRequest), true); 1054 CHECK(checkpoint_functions_[0] == nullptr); 1055 CHECK(checkpoint_functions_[1] == nullptr); 1056 CHECK(checkpoint_functions_[2] == nullptr); 1057 1058 // We may be deleting a still born thread. 1059 SetStateUnsafe(kTerminated); 1060 1061 delete wait_cond_; 1062 delete wait_mutex_; 1063 1064 if (long_jump_context_ != nullptr) { 1065 delete long_jump_context_; 1066 } 1067 1068 delete debug_invoke_req_; 1069 delete single_step_control_; 1070 delete instrumentation_stack_; 1071 delete name_; 1072 delete stack_trace_sample_; 1073 1074 Runtime::Current()->GetHeap()->RevokeThreadLocalBuffers(this); 1075 1076 TearDownAlternateSignalStack(); 1077} 1078 1079void Thread::HandleUncaughtExceptions(ScopedObjectAccess& soa) { 1080 if (!IsExceptionPending()) { 1081 return; 1082 } 1083 ScopedLocalRef<jobject> peer(jni_env_, soa.AddLocalReference<jobject>(opeer_)); 1084 ScopedThreadStateChange tsc(this, kNative); 1085 1086 // Get and clear the exception. 1087 ScopedLocalRef<jthrowable> exception(jni_env_, jni_env_->ExceptionOccurred()); 1088 jni_env_->ExceptionClear(); 1089 1090 // If the thread has its own handler, use that. 1091 ScopedLocalRef<jobject> handler(jni_env_, 1092 jni_env_->GetObjectField(peer.get(), 1093 WellKnownClasses::java_lang_Thread_uncaughtHandler)); 1094 if (handler.get() == nullptr) { 1095 // Otherwise use the thread group's default handler. 1096 handler.reset(jni_env_->GetObjectField(peer.get(), WellKnownClasses::java_lang_Thread_group)); 1097 } 1098 1099 // Call the handler. 1100 jni_env_->CallVoidMethod(handler.get(), 1101 WellKnownClasses::java_lang_Thread$UncaughtExceptionHandler_uncaughtException, 1102 peer.get(), exception.get()); 1103 1104 // If the handler threw, clear that exception too. 1105 jni_env_->ExceptionClear(); 1106} 1107 1108void Thread::RemoveFromThreadGroup(ScopedObjectAccess& soa) { 1109 // this.group.removeThread(this); 1110 // group can be null if we're in the compiler or a test. 1111 mirror::Object* ogroup = soa.DecodeField(WellKnownClasses::java_lang_Thread_group)->GetObject(opeer_); 1112 if (ogroup != nullptr) { 1113 ScopedLocalRef<jobject> group(soa.Env(), soa.AddLocalReference<jobject>(ogroup)); 1114 ScopedLocalRef<jobject> peer(soa.Env(), soa.AddLocalReference<jobject>(opeer_)); 1115 ScopedThreadStateChange tsc(soa.Self(), kNative); 1116 jni_env_->CallVoidMethod(group.get(), WellKnownClasses::java_lang_ThreadGroup_removeThread, 1117 peer.get()); 1118 } 1119} 1120 1121size_t Thread::NumSirtReferences() { 1122 size_t count = 0; 1123 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1124 count += cur->NumberOfReferences(); 1125 } 1126 return count; 1127} 1128 1129bool Thread::SirtContains(jobject obj) const { 1130 mirror::Object** sirt_entry = reinterpret_cast<mirror::Object**>(obj); 1131 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1132 if (cur->Contains(sirt_entry)) { 1133 return true; 1134 } 1135 } 1136 // JNI code invoked from portable code uses shadow frames rather than the SIRT. 1137 return managed_stack_.ShadowFramesContain(sirt_entry); 1138} 1139 1140void Thread::SirtVisitRoots(RootVisitor* visitor, void* arg) { 1141 for (StackIndirectReferenceTable* cur = top_sirt_; cur; cur = cur->GetLink()) { 1142 size_t num_refs = cur->NumberOfReferences(); 1143 for (size_t j = 0; j < num_refs; ++j) { 1144 mirror::Object* object = cur->GetReference(j); 1145 if (object != nullptr) { 1146 const mirror::Object* new_obj = visitor(object, arg); 1147 DCHECK(new_obj != nullptr); 1148 if (new_obj != object) { 1149 cur->SetReference(j, const_cast<mirror::Object*>(new_obj)); 1150 } 1151 } 1152 } 1153 } 1154} 1155 1156mirror::Object* Thread::DecodeJObject(jobject obj) const { 1157 Locks::mutator_lock_->AssertSharedHeld(this); 1158 if (obj == nullptr) { 1159 return nullptr; 1160 } 1161 IndirectRef ref = reinterpret_cast<IndirectRef>(obj); 1162 IndirectRefKind kind = GetIndirectRefKind(ref); 1163 mirror::Object* result; 1164 // The "kinds" below are sorted by the frequency we expect to encounter them. 1165 if (kind == kLocal) { 1166 IndirectReferenceTable& locals = jni_env_->locals; 1167 result = const_cast<mirror::Object*>(locals.Get(ref)); 1168 } else if (kind == kSirtOrInvalid) { 1169 // TODO: make stack indirect reference table lookup more efficient 1170 // Check if this is a local reference in the SIRT 1171 if (LIKELY(SirtContains(obj))) { 1172 result = *reinterpret_cast<mirror::Object**>(obj); // Read from SIRT 1173 } else if (Runtime::Current()->GetJavaVM()->work_around_app_jni_bugs) { 1174 // Assume an invalid local reference is actually a direct pointer. 1175 result = reinterpret_cast<mirror::Object*>(obj); 1176 } else { 1177 result = kInvalidIndirectRefObject; 1178 } 1179 } else if (kind == kGlobal) { 1180 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 1181 IndirectReferenceTable& globals = vm->globals; 1182 ReaderMutexLock mu(const_cast<Thread*>(this), vm->globals_lock); 1183 result = const_cast<mirror::Object*>(globals.Get(ref)); 1184 } else { 1185 DCHECK_EQ(kind, kWeakGlobal); 1186 result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref); 1187 if (result == kClearedJniWeakGlobal) { 1188 // This is a special case where it's okay to return nullptr. 1189 return nullptr; 1190 } 1191 } 1192 1193 if (UNLIKELY(result == nullptr)) { 1194 JniAbortF(nullptr, "use of deleted %s %p", ToStr<IndirectRefKind>(kind).c_str(), obj); 1195 } else { 1196 if (kIsDebugBuild && (result != kInvalidIndirectRefObject)) { 1197 Runtime::Current()->GetHeap()->VerifyObject(result); 1198 } 1199 } 1200 return result; 1201} 1202 1203// Implements java.lang.Thread.interrupted. 1204bool Thread::Interrupted() { 1205 MutexLock mu(Thread::Current(), *wait_mutex_); 1206 bool interrupted = interrupted_; 1207 interrupted_ = false; 1208 return interrupted; 1209} 1210 1211// Implements java.lang.Thread.isInterrupted. 1212bool Thread::IsInterrupted() { 1213 MutexLock mu(Thread::Current(), *wait_mutex_); 1214 return interrupted_; 1215} 1216 1217void Thread::Interrupt() { 1218 Thread* self = Thread::Current(); 1219 MutexLock mu(self, *wait_mutex_); 1220 if (interrupted_) { 1221 return; 1222 } 1223 interrupted_ = true; 1224 NotifyLocked(self); 1225} 1226 1227void Thread::Notify() { 1228 Thread* self = Thread::Current(); 1229 MutexLock mu(self, *wait_mutex_); 1230 NotifyLocked(self); 1231} 1232 1233void Thread::NotifyLocked(Thread* self) { 1234 if (wait_monitor_ != nullptr) { 1235 wait_cond_->Signal(self); 1236 } 1237} 1238 1239class CountStackDepthVisitor : public StackVisitor { 1240 public: 1241 explicit CountStackDepthVisitor(Thread* thread) 1242 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1243 : StackVisitor(thread, nullptr), 1244 depth_(0), skip_depth_(0), skipping_(true) {} 1245 1246 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1247 // We want to skip frames up to and including the exception's constructor. 1248 // Note we also skip the frame if it doesn't have a method (namely the callee 1249 // save frame) 1250 mirror::ArtMethod* m = GetMethod(); 1251 if (skipping_ && !m->IsRuntimeMethod() && 1252 !mirror::Throwable::GetJavaLangThrowable()->IsAssignableFrom(m->GetDeclaringClass())) { 1253 skipping_ = false; 1254 } 1255 if (!skipping_) { 1256 if (!m->IsRuntimeMethod()) { // Ignore runtime frames (in particular callee save). 1257 ++depth_; 1258 } 1259 } else { 1260 ++skip_depth_; 1261 } 1262 return true; 1263 } 1264 1265 int GetDepth() const { 1266 return depth_; 1267 } 1268 1269 int GetSkipDepth() const { 1270 return skip_depth_; 1271 } 1272 1273 private: 1274 uint32_t depth_; 1275 uint32_t skip_depth_; 1276 bool skipping_; 1277}; 1278 1279class BuildInternalStackTraceVisitor : public StackVisitor { 1280 public: 1281 explicit BuildInternalStackTraceVisitor(Thread* self, Thread* thread, int skip_depth) 1282 : StackVisitor(thread, nullptr), self_(self), 1283 skip_depth_(skip_depth), count_(0), dex_pc_trace_(nullptr), method_trace_(nullptr) {} 1284 1285 bool Init(int depth) 1286 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1287 // Allocate method trace with an extra slot that will hold the PC trace 1288 SirtRef<mirror::ObjectArray<mirror::Object> > 1289 method_trace(self_, 1290 Runtime::Current()->GetClassLinker()->AllocObjectArray<mirror::Object>(self_, 1291 depth + 1)); 1292 if (method_trace.get() == nullptr) { 1293 return false; 1294 } 1295 mirror::IntArray* dex_pc_trace = mirror::IntArray::Alloc(self_, depth); 1296 if (dex_pc_trace == nullptr) { 1297 return false; 1298 } 1299 // Save PC trace in last element of method trace, also places it into the 1300 // object graph. 1301 method_trace->Set(depth, dex_pc_trace); 1302 // Set the Object*s and assert that no thread suspension is now possible. 1303 const char* last_no_suspend_cause = 1304 self_->StartAssertNoThreadSuspension("Building internal stack trace"); 1305 CHECK(last_no_suspend_cause == nullptr) << last_no_suspend_cause; 1306 method_trace_ = method_trace.get(); 1307 dex_pc_trace_ = dex_pc_trace; 1308 return true; 1309 } 1310 1311 virtual ~BuildInternalStackTraceVisitor() { 1312 if (method_trace_ != nullptr) { 1313 self_->EndAssertNoThreadSuspension(nullptr); 1314 } 1315 } 1316 1317 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1318 if (method_trace_ == nullptr || dex_pc_trace_ == nullptr) { 1319 return true; // We're probably trying to fillInStackTrace for an OutOfMemoryError. 1320 } 1321 if (skip_depth_ > 0) { 1322 skip_depth_--; 1323 return true; 1324 } 1325 mirror::ArtMethod* m = GetMethod(); 1326 if (m->IsRuntimeMethod()) { 1327 return true; // Ignore runtime frames (in particular callee save). 1328 } 1329 method_trace_->Set(count_, m); 1330 dex_pc_trace_->Set(count_, m->IsProxyMethod() ? DexFile::kDexNoIndex : GetDexPc()); 1331 ++count_; 1332 return true; 1333 } 1334 1335 mirror::ObjectArray<mirror::Object>* GetInternalStackTrace() const { 1336 return method_trace_; 1337 } 1338 1339 private: 1340 Thread* const self_; 1341 // How many more frames to skip. 1342 int32_t skip_depth_; 1343 // Current position down stack trace. 1344 uint32_t count_; 1345 // Array of dex PC values. 1346 mirror::IntArray* dex_pc_trace_; 1347 // An array of the methods on the stack, the last entry is a reference to the PC trace. 1348 mirror::ObjectArray<mirror::Object>* method_trace_; 1349}; 1350 1351jobject Thread::CreateInternalStackTrace(const ScopedObjectAccessUnchecked& soa) const { 1352 // Compute depth of stack 1353 CountStackDepthVisitor count_visitor(const_cast<Thread*>(this)); 1354 count_visitor.WalkStack(); 1355 int32_t depth = count_visitor.GetDepth(); 1356 int32_t skip_depth = count_visitor.GetSkipDepth(); 1357 1358 // Build internal stack trace. 1359 BuildInternalStackTraceVisitor build_trace_visitor(soa.Self(), const_cast<Thread*>(this), 1360 skip_depth); 1361 if (!build_trace_visitor.Init(depth)) { 1362 return nullptr; // Allocation failed. 1363 } 1364 build_trace_visitor.WalkStack(); 1365 mirror::ObjectArray<mirror::Object>* trace = build_trace_visitor.GetInternalStackTrace(); 1366 if (kIsDebugBuild) { 1367 for (int32_t i = 0; i < trace->GetLength(); ++i) { 1368 CHECK(trace->Get(i) != nullptr); 1369 } 1370 } 1371 return soa.AddLocalReference<jobjectArray>(trace); 1372} 1373 1374jobjectArray Thread::InternalStackTraceToStackTraceElementArray(JNIEnv* env, jobject internal, 1375 jobjectArray output_array, int* stack_depth) { 1376 // Transition into runnable state to work on Object*/Array* 1377 ScopedObjectAccess soa(env); 1378 // Decode the internal stack trace into the depth, method trace and PC trace 1379 int32_t depth = soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal)->GetLength() - 1; 1380 1381 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 1382 1383 jobjectArray result; 1384 1385 if (output_array != nullptr) { 1386 // Reuse the array we were given. 1387 result = output_array; 1388 // ...adjusting the number of frames we'll write to not exceed the array length. 1389 const int32_t traces_length = 1390 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->GetLength(); 1391 depth = std::min(depth, traces_length); 1392 } else { 1393 // Create java_trace array and place in local reference table 1394 mirror::ObjectArray<mirror::StackTraceElement>* java_traces = 1395 class_linker->AllocStackTraceElementArray(soa.Self(), depth); 1396 if (java_traces == nullptr) { 1397 return nullptr; 1398 } 1399 result = soa.AddLocalReference<jobjectArray>(java_traces); 1400 } 1401 1402 if (stack_depth != nullptr) { 1403 *stack_depth = depth; 1404 } 1405 1406 for (int32_t i = 0; i < depth; ++i) { 1407 mirror::ObjectArray<mirror::Object>* method_trace = 1408 soa.Decode<mirror::ObjectArray<mirror::Object>*>(internal); 1409 // Prepare parameters for StackTraceElement(String cls, String method, String file, int line) 1410 mirror::ArtMethod* method = down_cast<mirror::ArtMethod*>(method_trace->Get(i)); 1411 MethodHelper mh(method); 1412 int32_t line_number; 1413 SirtRef<mirror::String> class_name_object(soa.Self(), NULL); 1414 SirtRef<mirror::String> source_name_object(soa.Self(), NULL); 1415 if (method->IsProxyMethod()) { 1416 line_number = -1; 1417 class_name_object.reset(method->GetDeclaringClass()->GetName()); 1418 // source_name_object intentionally left null for proxy methods 1419 } else { 1420 mirror::IntArray* pc_trace = down_cast<mirror::IntArray*>(method_trace->Get(depth)); 1421 uint32_t dex_pc = pc_trace->Get(i); 1422 line_number = mh.GetLineNumFromDexPC(dex_pc); 1423 // Allocate element, potentially triggering GC 1424 // TODO: reuse class_name_object via Class::name_? 1425 const char* descriptor = mh.GetDeclaringClassDescriptor(); 1426 CHECK(descriptor != NULL); 1427 std::string class_name(PrettyDescriptor(descriptor)); 1428 class_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), class_name.c_str())); 1429 if (class_name_object.get() == NULL) { 1430 return NULL; 1431 } 1432 const char* source_file = mh.GetDeclaringClassSourceFile(); 1433 source_name_object.reset(mirror::String::AllocFromModifiedUtf8(soa.Self(), source_file)); 1434 if (source_name_object.get() == NULL) { 1435 return NULL; 1436 } 1437 } 1438 const char* method_name = mh.GetName(); 1439 CHECK(method_name != nullptr); 1440 SirtRef<mirror::String> method_name_object(soa.Self(), 1441 mirror::String::AllocFromModifiedUtf8(soa.Self(), 1442 method_name)); 1443 if (method_name_object.get() == nullptr) { 1444 return nullptr; 1445 } 1446 mirror::StackTraceElement* obj = mirror::StackTraceElement::Alloc( 1447 soa.Self(), class_name_object, method_name_object, source_name_object, line_number); 1448 if (obj == nullptr) { 1449 return nullptr; 1450 } 1451 soa.Decode<mirror::ObjectArray<mirror::StackTraceElement>*>(result)->Set(i, obj); 1452 } 1453 return result; 1454} 1455 1456void Thread::ThrowNewExceptionF(const ThrowLocation& throw_location, 1457 const char* exception_class_descriptor, const char* fmt, ...) { 1458 va_list args; 1459 va_start(args, fmt); 1460 ThrowNewExceptionV(throw_location, exception_class_descriptor, 1461 fmt, args); 1462 va_end(args); 1463} 1464 1465void Thread::ThrowNewExceptionV(const ThrowLocation& throw_location, 1466 const char* exception_class_descriptor, 1467 const char* fmt, va_list ap) { 1468 std::string msg; 1469 StringAppendV(&msg, fmt, ap); 1470 ThrowNewException(throw_location, exception_class_descriptor, msg.c_str()); 1471} 1472 1473void Thread::ThrowNewException(const ThrowLocation& throw_location, const char* exception_class_descriptor, 1474 const char* msg) { 1475 AssertNoPendingException(); // Callers should either clear or call ThrowNewWrappedException. 1476 ThrowNewWrappedException(throw_location, exception_class_descriptor, msg); 1477} 1478 1479void Thread::ThrowNewWrappedException(const ThrowLocation& throw_location, 1480 const char* exception_class_descriptor, 1481 const char* msg) { 1482 DCHECK_EQ(this, Thread::Current()); 1483 // Ensure we don't forget arguments over object allocation. 1484 SirtRef<mirror::Object> saved_throw_this(this, throw_location.GetThis()); 1485 SirtRef<mirror::ArtMethod> saved_throw_method(this, throw_location.GetMethod()); 1486 // Ignore the cause throw location. TODO: should we report this as a re-throw? 1487 SirtRef<mirror::Throwable> cause(this, GetException(nullptr)); 1488 ClearException(); 1489 Runtime* runtime = Runtime::Current(); 1490 1491 mirror::ClassLoader* cl = nullptr; 1492 if (saved_throw_method.get() != nullptr) { 1493 cl = saved_throw_method.get()->GetDeclaringClass()->GetClassLoader(); 1494 } 1495 SirtRef<mirror::ClassLoader> class_loader(this, cl); 1496 SirtRef<mirror::Class> 1497 exception_class(this, runtime->GetClassLinker()->FindClass(exception_class_descriptor, 1498 class_loader)); 1499 if (UNLIKELY(exception_class.get() == nullptr)) { 1500 CHECK(IsExceptionPending()); 1501 LOG(ERROR) << "No exception class " << PrettyDescriptor(exception_class_descriptor); 1502 return; 1503 } 1504 1505 if (UNLIKELY(!runtime->GetClassLinker()->EnsureInitialized(exception_class, true, true))) { 1506 DCHECK(IsExceptionPending()); 1507 return; 1508 } 1509 DCHECK(!runtime->IsStarted() || exception_class->IsThrowableClass()); 1510 SirtRef<mirror::Throwable> exception(this, 1511 down_cast<mirror::Throwable*>(exception_class->AllocObject(this))); 1512 1513 // If we couldn't allocate the exception, throw the pre-allocated out of memory exception. 1514 if (exception.get() == nullptr) { 1515 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1516 throw_location.GetDexPc()); 1517 SetException(gc_safe_throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1518 return; 1519 } 1520 1521 // Choose an appropriate constructor and set up the arguments. 1522 const char* signature; 1523 SirtRef<mirror::String> msg_string(this, nullptr); 1524 if (msg != nullptr) { 1525 // Ensure we remember this and the method over the String allocation. 1526 msg_string.reset(mirror::String::AllocFromModifiedUtf8(this, msg)); 1527 if (UNLIKELY(msg_string.get() == nullptr)) { 1528 CHECK(IsExceptionPending()); // OOME. 1529 return; 1530 } 1531 if (cause.get() == nullptr) { 1532 signature = "(Ljava/lang/String;)V"; 1533 } else { 1534 signature = "(Ljava/lang/String;Ljava/lang/Throwable;)V"; 1535 } 1536 } else { 1537 if (cause.get() == nullptr) { 1538 signature = "()V"; 1539 } else { 1540 signature = "(Ljava/lang/Throwable;)V"; 1541 } 1542 } 1543 mirror::ArtMethod* exception_init_method = 1544 exception_class->FindDeclaredDirectMethod("<init>", signature); 1545 1546 CHECK(exception_init_method != nullptr) << "No <init>" << signature << " in " 1547 << PrettyDescriptor(exception_class_descriptor); 1548 1549 if (UNLIKELY(!runtime->IsStarted())) { 1550 // Something is trying to throw an exception without a started runtime, which is the common 1551 // case in the compiler. We won't be able to invoke the constructor of the exception, so set 1552 // the exception fields directly. 1553 if (msg != nullptr) { 1554 exception->SetDetailMessage(msg_string.get()); 1555 } 1556 if (cause.get() != nullptr) { 1557 exception->SetCause(cause.get()); 1558 } 1559 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1560 throw_location.GetDexPc()); 1561 SetException(gc_safe_throw_location, exception.get()); 1562 } else { 1563 ArgArray args("VLL", 3); 1564 args.Append(reinterpret_cast<uint32_t>(exception.get())); 1565 if (msg != nullptr) { 1566 args.Append(reinterpret_cast<uint32_t>(msg_string.get())); 1567 } 1568 if (cause.get() != nullptr) { 1569 args.Append(reinterpret_cast<uint32_t>(cause.get())); 1570 } 1571 JValue result; 1572 exception_init_method->Invoke(this, args.GetArray(), args.GetNumBytes(), &result, 'V'); 1573 if (LIKELY(!IsExceptionPending())) { 1574 ThrowLocation gc_safe_throw_location(saved_throw_this.get(), saved_throw_method.get(), 1575 throw_location.GetDexPc()); 1576 SetException(gc_safe_throw_location, exception.get()); 1577 } 1578 } 1579} 1580 1581void Thread::ThrowOutOfMemoryError(const char* msg) { 1582 LOG(ERROR) << StringPrintf("Throwing OutOfMemoryError \"%s\"%s", 1583 msg, (throwing_OutOfMemoryError_ ? " (recursive case)" : "")); 1584 ThrowLocation throw_location = GetCurrentLocationForThrow(); 1585 if (!throwing_OutOfMemoryError_) { 1586 throwing_OutOfMemoryError_ = true; 1587 ThrowNewException(throw_location, "Ljava/lang/OutOfMemoryError;", msg); 1588 throwing_OutOfMemoryError_ = false; 1589 } else { 1590 Dump(LOG(ERROR)); // The pre-allocated OOME has no stack, so help out and log one. 1591 SetException(throw_location, Runtime::Current()->GetPreAllocatedOutOfMemoryError()); 1592 } 1593} 1594 1595Thread* Thread::CurrentFromGdb() { 1596 return Thread::Current(); 1597} 1598 1599void Thread::DumpFromGdb() const { 1600 std::ostringstream ss; 1601 Dump(ss); 1602 std::string str(ss.str()); 1603 // log to stderr for debugging command line processes 1604 std::cerr << str; 1605#ifdef HAVE_ANDROID_OS 1606 // log to logcat for debugging frameworks processes 1607 LOG(INFO) << str; 1608#endif 1609} 1610 1611struct EntryPointInfo { 1612 uint32_t offset; 1613 const char* name; 1614}; 1615#define INTERPRETER_ENTRY_POINT_INFO(x) { INTERPRETER_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1616#define JNI_ENTRY_POINT_INFO(x) { JNI_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1617#define PORTABLE_ENTRY_POINT_INFO(x) { PORTABLE_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1618#define QUICK_ENTRY_POINT_INFO(x) { QUICK_ENTRYPOINT_OFFSET(x).Uint32Value(), #x } 1619static const EntryPointInfo gThreadEntryPointInfo[] = { 1620 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToInterpreterBridge), 1621 INTERPRETER_ENTRY_POINT_INFO(pInterpreterToCompiledCodeBridge), 1622 JNI_ENTRY_POINT_INFO(pDlsymLookup), 1623 PORTABLE_ENTRY_POINT_INFO(pPortableImtConflictTrampoline), 1624 PORTABLE_ENTRY_POINT_INFO(pPortableResolutionTrampoline), 1625 PORTABLE_ENTRY_POINT_INFO(pPortableToInterpreterBridge), 1626 QUICK_ENTRY_POINT_INFO(pAllocArray), 1627 QUICK_ENTRY_POINT_INFO(pAllocArrayWithAccessCheck), 1628 QUICK_ENTRY_POINT_INFO(pAllocObject), 1629 QUICK_ENTRY_POINT_INFO(pAllocObjectWithAccessCheck), 1630 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArray), 1631 QUICK_ENTRY_POINT_INFO(pCheckAndAllocArrayWithAccessCheck), 1632 QUICK_ENTRY_POINT_INFO(pInstanceofNonTrivial), 1633 QUICK_ENTRY_POINT_INFO(pCheckCast), 1634 QUICK_ENTRY_POINT_INFO(pInitializeStaticStorage), 1635 QUICK_ENTRY_POINT_INFO(pInitializeTypeAndVerifyAccess), 1636 QUICK_ENTRY_POINT_INFO(pInitializeType), 1637 QUICK_ENTRY_POINT_INFO(pResolveString), 1638 QUICK_ENTRY_POINT_INFO(pSet32Instance), 1639 QUICK_ENTRY_POINT_INFO(pSet32Static), 1640 QUICK_ENTRY_POINT_INFO(pSet64Instance), 1641 QUICK_ENTRY_POINT_INFO(pSet64Static), 1642 QUICK_ENTRY_POINT_INFO(pSetObjInstance), 1643 QUICK_ENTRY_POINT_INFO(pSetObjStatic), 1644 QUICK_ENTRY_POINT_INFO(pGet32Instance), 1645 QUICK_ENTRY_POINT_INFO(pGet32Static), 1646 QUICK_ENTRY_POINT_INFO(pGet64Instance), 1647 QUICK_ENTRY_POINT_INFO(pGet64Static), 1648 QUICK_ENTRY_POINT_INFO(pGetObjInstance), 1649 QUICK_ENTRY_POINT_INFO(pGetObjStatic), 1650 QUICK_ENTRY_POINT_INFO(pAputObjectWithNullAndBoundCheck), 1651 QUICK_ENTRY_POINT_INFO(pAputObjectWithBoundCheck), 1652 QUICK_ENTRY_POINT_INFO(pAputObject), 1653 QUICK_ENTRY_POINT_INFO(pHandleFillArrayData), 1654 QUICK_ENTRY_POINT_INFO(pJniMethodStart), 1655 QUICK_ENTRY_POINT_INFO(pJniMethodStartSynchronized), 1656 QUICK_ENTRY_POINT_INFO(pJniMethodEnd), 1657 QUICK_ENTRY_POINT_INFO(pJniMethodEndSynchronized), 1658 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReference), 1659 QUICK_ENTRY_POINT_INFO(pJniMethodEndWithReferenceSynchronized), 1660 QUICK_ENTRY_POINT_INFO(pLockObject), 1661 QUICK_ENTRY_POINT_INFO(pUnlockObject), 1662 QUICK_ENTRY_POINT_INFO(pCmpgDouble), 1663 QUICK_ENTRY_POINT_INFO(pCmpgFloat), 1664 QUICK_ENTRY_POINT_INFO(pCmplDouble), 1665 QUICK_ENTRY_POINT_INFO(pCmplFloat), 1666 QUICK_ENTRY_POINT_INFO(pFmod), 1667 QUICK_ENTRY_POINT_INFO(pSqrt), 1668 QUICK_ENTRY_POINT_INFO(pL2d), 1669 QUICK_ENTRY_POINT_INFO(pFmodf), 1670 QUICK_ENTRY_POINT_INFO(pL2f), 1671 QUICK_ENTRY_POINT_INFO(pD2iz), 1672 QUICK_ENTRY_POINT_INFO(pF2iz), 1673 QUICK_ENTRY_POINT_INFO(pIdivmod), 1674 QUICK_ENTRY_POINT_INFO(pD2l), 1675 QUICK_ENTRY_POINT_INFO(pF2l), 1676 QUICK_ENTRY_POINT_INFO(pLdiv), 1677 QUICK_ENTRY_POINT_INFO(pLmod), 1678 QUICK_ENTRY_POINT_INFO(pLmul), 1679 QUICK_ENTRY_POINT_INFO(pShlLong), 1680 QUICK_ENTRY_POINT_INFO(pShrLong), 1681 QUICK_ENTRY_POINT_INFO(pUshrLong), 1682 QUICK_ENTRY_POINT_INFO(pIndexOf), 1683 QUICK_ENTRY_POINT_INFO(pMemcmp16), 1684 QUICK_ENTRY_POINT_INFO(pStringCompareTo), 1685 QUICK_ENTRY_POINT_INFO(pMemcpy), 1686 QUICK_ENTRY_POINT_INFO(pQuickImtConflictTrampoline), 1687 QUICK_ENTRY_POINT_INFO(pQuickResolutionTrampoline), 1688 QUICK_ENTRY_POINT_INFO(pQuickToInterpreterBridge), 1689 QUICK_ENTRY_POINT_INFO(pInvokeDirectTrampolineWithAccessCheck), 1690 QUICK_ENTRY_POINT_INFO(pInvokeInterfaceTrampolineWithAccessCheck), 1691 QUICK_ENTRY_POINT_INFO(pInvokeStaticTrampolineWithAccessCheck), 1692 QUICK_ENTRY_POINT_INFO(pInvokeSuperTrampolineWithAccessCheck), 1693 QUICK_ENTRY_POINT_INFO(pInvokeVirtualTrampolineWithAccessCheck), 1694 QUICK_ENTRY_POINT_INFO(pCheckSuspend), 1695 QUICK_ENTRY_POINT_INFO(pTestSuspend), 1696 QUICK_ENTRY_POINT_INFO(pDeliverException), 1697 QUICK_ENTRY_POINT_INFO(pThrowArrayBounds), 1698 QUICK_ENTRY_POINT_INFO(pThrowDivZero), 1699 QUICK_ENTRY_POINT_INFO(pThrowNoSuchMethod), 1700 QUICK_ENTRY_POINT_INFO(pThrowNullPointer), 1701 QUICK_ENTRY_POINT_INFO(pThrowStackOverflow), 1702}; 1703#undef QUICK_ENTRY_POINT_INFO 1704 1705void Thread::DumpThreadOffset(std::ostream& os, uint32_t offset, size_t size_of_pointers) { 1706 CHECK_EQ(size_of_pointers, 4U); // TODO: support 64-bit targets. 1707 1708#define DO_THREAD_OFFSET(x) \ 1709 if (offset == static_cast<uint32_t>(OFFSETOF_VOLATILE_MEMBER(Thread, x))) { \ 1710 os << # x; \ 1711 return; \ 1712 } 1713 DO_THREAD_OFFSET(state_and_flags_); 1714 DO_THREAD_OFFSET(card_table_); 1715 DO_THREAD_OFFSET(exception_); 1716 DO_THREAD_OFFSET(opeer_); 1717 DO_THREAD_OFFSET(jni_env_); 1718 DO_THREAD_OFFSET(self_); 1719 DO_THREAD_OFFSET(stack_end_); 1720 DO_THREAD_OFFSET(suspend_count_); 1721 DO_THREAD_OFFSET(thin_lock_thread_id_); 1722 // DO_THREAD_OFFSET(top_of_managed_stack_); 1723 // DO_THREAD_OFFSET(top_of_managed_stack_pc_); 1724 DO_THREAD_OFFSET(top_sirt_); 1725#undef DO_THREAD_OFFSET 1726 1727 size_t entry_point_count = arraysize(gThreadEntryPointInfo); 1728 CHECK_EQ(entry_point_count * size_of_pointers, 1729 sizeof(InterpreterEntryPoints) + sizeof(JniEntryPoints) + sizeof(PortableEntryPoints) + 1730 sizeof(QuickEntryPoints)); 1731 uint32_t expected_offset = OFFSETOF_MEMBER(Thread, interpreter_entrypoints_); 1732 for (size_t i = 0; i < entry_point_count; ++i) { 1733 CHECK_EQ(gThreadEntryPointInfo[i].offset, expected_offset) << gThreadEntryPointInfo[i].name; 1734 expected_offset += size_of_pointers; 1735 if (gThreadEntryPointInfo[i].offset == offset) { 1736 os << gThreadEntryPointInfo[i].name; 1737 return; 1738 } 1739 } 1740 os << offset; 1741} 1742 1743void Thread::QuickDeliverException() { 1744 // Get exception from thread. 1745 ThrowLocation throw_location; 1746 mirror::Throwable* exception = GetException(&throw_location); 1747 CHECK(exception != nullptr); 1748 // Don't leave exception visible while we try to find the handler, which may cause class 1749 // resolution. 1750 ClearException(); 1751 bool is_deoptimization = (exception == reinterpret_cast<mirror::Throwable*>(-1)); 1752 if (kDebugExceptionDelivery) { 1753 if (!is_deoptimization) { 1754 mirror::String* msg = exception->GetDetailMessage(); 1755 std::string str_msg(msg != nullptr ? msg->ToModifiedUtf8() : ""); 1756 DumpStack(LOG(INFO) << "Delivering exception: " << PrettyTypeOf(exception) 1757 << ": " << str_msg << "\n"); 1758 } else { 1759 DumpStack(LOG(INFO) << "Deoptimizing: "); 1760 } 1761 } 1762 CatchFinder catch_finder(this, throw_location, exception, is_deoptimization); 1763 catch_finder.FindCatch(); 1764 catch_finder.UpdateInstrumentationStack(); 1765 catch_finder.DoLongJump(); 1766 LOG(FATAL) << "UNREACHABLE"; 1767} 1768 1769Context* Thread::GetLongJumpContext() { 1770 Context* result = long_jump_context_; 1771 if (result == nullptr) { 1772 result = Context::Create(); 1773 } else { 1774 long_jump_context_ = nullptr; // Avoid context being shared. 1775 result->Reset(); 1776 } 1777 return result; 1778} 1779 1780struct CurrentMethodVisitor : public StackVisitor { 1781 CurrentMethodVisitor(Thread* thread, Context* context) 1782 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1783 : StackVisitor(thread, context), this_object_(nullptr), method_(nullptr), dex_pc_(0) {} 1784 virtual bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1785 mirror::ArtMethod* m = GetMethod(); 1786 if (m->IsRuntimeMethod()) { 1787 // Continue if this is a runtime method. 1788 return true; 1789 } 1790 if (context_ != nullptr) { 1791 this_object_ = GetThisObject(); 1792 } 1793 method_ = m; 1794 dex_pc_ = GetDexPc(); 1795 return false; 1796 } 1797 mirror::Object* this_object_; 1798 mirror::ArtMethod* method_; 1799 uint32_t dex_pc_; 1800}; 1801 1802mirror::ArtMethod* Thread::GetCurrentMethod(uint32_t* dex_pc) const { 1803 CurrentMethodVisitor visitor(const_cast<Thread*>(this), nullptr); 1804 visitor.WalkStack(false); 1805 if (dex_pc != nullptr) { 1806 *dex_pc = visitor.dex_pc_; 1807 } 1808 return visitor.method_; 1809} 1810 1811ThrowLocation Thread::GetCurrentLocationForThrow() { 1812 Context* context = GetLongJumpContext(); 1813 CurrentMethodVisitor visitor(this, context); 1814 visitor.WalkStack(false); 1815 ReleaseLongJumpContext(context); 1816 return ThrowLocation(visitor.this_object_, visitor.method_, visitor.dex_pc_); 1817} 1818 1819bool Thread::HoldsLock(mirror::Object* object) { 1820 if (object == nullptr) { 1821 return false; 1822 } 1823 return object->GetLockOwnerThreadId() == thin_lock_thread_id_; 1824} 1825 1826// RootVisitor parameters are: (const Object* obj, size_t vreg, const StackVisitor* visitor). 1827template <typename RootVisitor> 1828class ReferenceMapVisitor : public StackVisitor { 1829 public: 1830 ReferenceMapVisitor(Thread* thread, Context* context, const RootVisitor& visitor) 1831 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1832 : StackVisitor(thread, context), visitor_(visitor) {} 1833 1834 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1835 if (false) { 1836 LOG(INFO) << "Visiting stack roots in " << PrettyMethod(GetMethod()) 1837 << StringPrintf("@ PC:%04x", GetDexPc()); 1838 } 1839 ShadowFrame* shadow_frame = GetCurrentShadowFrame(); 1840 if (shadow_frame != nullptr) { 1841 mirror::ArtMethod* m = shadow_frame->GetMethod(); 1842 size_t num_regs = shadow_frame->NumberOfVRegs(); 1843 if (m->IsNative() || shadow_frame->HasReferenceArray()) { 1844 // SIRT for JNI or References for interpreter. 1845 for (size_t reg = 0; reg < num_regs; ++reg) { 1846 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1847 if (ref != nullptr) { 1848 mirror::Object* new_ref = visitor_(ref, reg, this); 1849 if (new_ref != ref) { 1850 shadow_frame->SetVRegReference(reg, new_ref); 1851 } 1852 } 1853 } 1854 } else { 1855 // Java method. 1856 // Portable path use DexGcMap and store in Method.native_gc_map_. 1857 const uint8_t* gc_map = m->GetNativeGcMap(); 1858 CHECK(gc_map != NULL) << PrettyMethod(m); 1859 verifier::DexPcToReferenceMap dex_gc_map(gc_map); 1860 uint32_t dex_pc = GetDexPc(); 1861 const uint8_t* reg_bitmap = dex_gc_map.FindBitMap(dex_pc); 1862 DCHECK(reg_bitmap != nullptr); 1863 num_regs = std::min(dex_gc_map.RegWidth() * 8, num_regs); 1864 for (size_t reg = 0; reg < num_regs; ++reg) { 1865 if (TestBitmap(reg, reg_bitmap)) { 1866 mirror::Object* ref = shadow_frame->GetVRegReference(reg); 1867 if (ref != nullptr) { 1868 mirror::Object* new_ref = visitor_(ref, reg, this); 1869 if (new_ref != ref) { 1870 shadow_frame->SetVRegReference(reg, new_ref); 1871 } 1872 } 1873 } 1874 } 1875 } 1876 } else { 1877 mirror::ArtMethod* m = GetMethod(); 1878 // Process register map (which native and runtime methods don't have) 1879 if (!m->IsNative() && !m->IsRuntimeMethod() && !m->IsProxyMethod()) { 1880 const uint8_t* native_gc_map = m->GetNativeGcMap(); 1881 CHECK(native_gc_map != nullptr) << PrettyMethod(m); 1882 mh_.ChangeMethod(m); 1883 const DexFile::CodeItem* code_item = mh_.GetCodeItem(); 1884 DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be nullptr or how would we compile its instructions? 1885 NativePcOffsetToReferenceMap map(native_gc_map); 1886 size_t num_regs = std::min(map.RegWidth() * 8, 1887 static_cast<size_t>(code_item->registers_size_)); 1888 if (num_regs > 0) { 1889 const uint8_t* reg_bitmap = map.FindBitMap(GetNativePcOffset()); 1890 DCHECK(reg_bitmap != nullptr); 1891 const VmapTable vmap_table(m->GetVmapTable()); 1892 uint32_t core_spills = m->GetCoreSpillMask(); 1893 uint32_t fp_spills = m->GetFpSpillMask(); 1894 size_t frame_size = m->GetFrameSizeInBytes(); 1895 // For all dex registers in the bitmap 1896 mirror::ArtMethod** cur_quick_frame = GetCurrentQuickFrame(); 1897 DCHECK(cur_quick_frame != nullptr); 1898 for (size_t reg = 0; reg < num_regs; ++reg) { 1899 // Does this register hold a reference? 1900 if (TestBitmap(reg, reg_bitmap)) { 1901 uint32_t vmap_offset; 1902 if (vmap_table.IsInContext(reg, kReferenceVReg, &vmap_offset)) { 1903 int vmap_reg = vmap_table.ComputeRegister(core_spills, vmap_offset, kReferenceVReg); 1904 mirror::Object* ref = reinterpret_cast<mirror::Object*>(GetGPR(vmap_reg)); 1905 if (ref != nullptr) { 1906 mirror::Object* new_ref = visitor_(ref, reg, this); 1907 if (ref != new_ref) { 1908 SetGPR(vmap_reg, reinterpret_cast<uintptr_t>(new_ref)); 1909 } 1910 } 1911 } else { 1912 uint32_t* reg_addr = 1913 GetVRegAddr(cur_quick_frame, code_item, core_spills, fp_spills, frame_size, reg); 1914 mirror::Object* ref = reinterpret_cast<mirror::Object*>(*reg_addr); 1915 if (ref != nullptr) { 1916 mirror::Object* new_ref = visitor_(ref, reg, this); 1917 if (ref != new_ref) { 1918 *reg_addr = reinterpret_cast<uint32_t>(new_ref); 1919 } 1920 } 1921 } 1922 } 1923 } 1924 } 1925 } 1926 } 1927 return true; 1928 } 1929 1930 private: 1931 static bool TestBitmap(int reg, const uint8_t* reg_vector) { 1932 return ((reg_vector[reg / 8] >> (reg % 8)) & 0x01) != 0; 1933 } 1934 1935 // Visitor for when we visit a root. 1936 const RootVisitor& visitor_; 1937 1938 // A method helper we keep around to avoid dex file/cache re-computations. 1939 MethodHelper mh_; 1940}; 1941 1942class RootCallbackVisitor { 1943 public: 1944 RootCallbackVisitor(RootVisitor* visitor, void* arg) : visitor_(visitor), arg_(arg) {} 1945 1946 mirror::Object* operator()(mirror::Object* obj, size_t, const StackVisitor*) const { 1947 return visitor_(obj, arg_); 1948 } 1949 1950 private: 1951 RootVisitor* visitor_; 1952 void* arg_; 1953}; 1954 1955class VerifyCallbackVisitor { 1956 public: 1957 VerifyCallbackVisitor(VerifyRootVisitor* visitor, void* arg) 1958 : visitor_(visitor), 1959 arg_(arg) { 1960 } 1961 1962 void operator()(const mirror::Object* obj, size_t vreg, const StackVisitor* visitor) const { 1963 visitor_(obj, arg_, vreg, visitor); 1964 } 1965 1966 private: 1967 VerifyRootVisitor* const visitor_; 1968 void* const arg_; 1969}; 1970 1971void Thread::SetClassLoaderOverride(mirror::ClassLoader* class_loader_override) { 1972 if (kIsDebugBuild) { 1973 Runtime::Current()->GetHeap()->VerifyObject(class_loader_override); 1974 } 1975 class_loader_override_ = class_loader_override; 1976} 1977 1978void Thread::VisitRoots(RootVisitor* visitor, void* arg) { 1979 if (opeer_ != nullptr) { 1980 opeer_ = visitor(opeer_, arg); 1981 } 1982 if (exception_ != nullptr) { 1983 exception_ = down_cast<mirror::Throwable*>(visitor(exception_, arg)); 1984 } 1985 throw_location_.VisitRoots(visitor, arg); 1986 if (class_loader_override_ != nullptr) { 1987 class_loader_override_ = down_cast<mirror::ClassLoader*>(visitor(class_loader_override_, arg)); 1988 } 1989 jni_env_->locals.VisitRoots(visitor, arg); 1990 jni_env_->monitors.VisitRoots(visitor, arg); 1991 1992 SirtVisitRoots(visitor, arg); 1993 1994 // Visit roots on this thread's stack 1995 Context* context = GetLongJumpContext(); 1996 RootCallbackVisitor visitorToCallback(visitor, arg); 1997 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context, visitorToCallback); 1998 mapper.WalkStack(); 1999 ReleaseLongJumpContext(context); 2000 2001 for (instrumentation::InstrumentationStackFrame& frame : *GetInstrumentationStack()) { 2002 if (frame.this_object_ != nullptr) { 2003 frame.this_object_ = visitor(frame.this_object_, arg); 2004 } 2005 DCHECK(frame.method_ != nullptr); 2006 frame.method_ = down_cast<mirror::ArtMethod*>(visitor(frame.method_, arg)); 2007 } 2008} 2009 2010static mirror::Object* VerifyRoot(mirror::Object* root, void* arg) { 2011 DCHECK(root != nullptr); 2012 DCHECK(arg != nullptr); 2013 reinterpret_cast<gc::Heap*>(arg)->VerifyObject(root); 2014 return root; 2015} 2016 2017void Thread::VerifyStackImpl() { 2018 UniquePtr<Context> context(Context::Create()); 2019 RootCallbackVisitor visitorToCallback(VerifyRoot, Runtime::Current()->GetHeap()); 2020 ReferenceMapVisitor<RootCallbackVisitor> mapper(this, context.get(), visitorToCallback); 2021 mapper.WalkStack(); 2022} 2023 2024// Set the stack end to that to be used during a stack overflow 2025void Thread::SetStackEndForStackOverflow() { 2026 // During stack overflow we allow use of the full stack. 2027 if (stack_end_ == stack_begin_) { 2028 // However, we seem to have already extended to use the full stack. 2029 LOG(ERROR) << "Need to increase kStackOverflowReservedBytes (currently " 2030 << kStackOverflowReservedBytes << ")?"; 2031 DumpStack(LOG(ERROR)); 2032 LOG(FATAL) << "Recursive stack overflow."; 2033 } 2034 2035 stack_end_ = stack_begin_; 2036} 2037 2038void Thread::SetTlab(byte* start, byte* end) { 2039 DCHECK_LE(start, end); 2040 thread_local_start_ = start; 2041 thread_local_pos_ = thread_local_start_; 2042 thread_local_end_ = end; 2043 thread_local_objects_ = 0; 2044} 2045 2046std::ostream& operator<<(std::ostream& os, const Thread& thread) { 2047 thread.ShortDump(os); 2048 return os; 2049} 2050 2051} // namespace art 2052