debugger.cc revision 4d6e48392771467b9e37fdeb32479ca29bf9c691
1/* 2 * Copyright (C) 2008 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#include "debugger.h" 18 19#include <sys/uio.h> 20 21#include <set> 22 23#include "arch/context.h" 24#include "class_linker.h" 25#include "class_linker-inl.h" 26#include "dex_file-inl.h" 27#include "dex_instruction.h" 28#include "field_helper.h" 29#include "gc/accounting/card_table-inl.h" 30#include "gc/space/large_object_space.h" 31#include "gc/space/space-inl.h" 32#include "handle_scope.h" 33#include "jdwp/object_registry.h" 34#include "method_helper.h" 35#include "mirror/art_field-inl.h" 36#include "mirror/art_method-inl.h" 37#include "mirror/class.h" 38#include "mirror/class-inl.h" 39#include "mirror/class_loader.h" 40#include "mirror/object-inl.h" 41#include "mirror/object_array-inl.h" 42#include "mirror/string-inl.h" 43#include "mirror/throwable.h" 44#include "quick/inline_method_analyser.h" 45#include "reflection.h" 46#include "safe_map.h" 47#include "scoped_thread_state_change.h" 48#include "ScopedLocalRef.h" 49#include "ScopedPrimitiveArray.h" 50#include "handle_scope-inl.h" 51#include "thread_list.h" 52#include "throw_location.h" 53#include "utf.h" 54#include "verifier/method_verifier-inl.h" 55#include "well_known_classes.h" 56 57#ifdef HAVE_ANDROID_OS 58#include "cutils/properties.h" 59#endif 60 61namespace art { 62 63static const size_t kMaxAllocRecordStackDepth = 16; // Max 255. 64static const size_t kDefaultNumAllocRecords = 64*1024; // Must be a power of 2. 2BE can hold 64k-1. 65 66// Limit alloc_record_count to the 2BE value that is the limit of the current protocol. 67static uint16_t CappedAllocRecordCount(size_t alloc_record_count) { 68 if (alloc_record_count > 0xffff) { 69 return 0xffff; 70 } 71 return alloc_record_count; 72} 73 74class AllocRecordStackTraceElement { 75 public: 76 AllocRecordStackTraceElement() : method_(nullptr), dex_pc_(0) { 77 } 78 79 int32_t LineNumber() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 80 mirror::ArtMethod* method = Method(); 81 DCHECK(method != nullptr); 82 return method->GetLineNumFromDexPC(DexPc()); 83 } 84 85 mirror::ArtMethod* Method() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 86 ScopedObjectAccessUnchecked soa(Thread::Current()); 87 return soa.DecodeMethod(method_); 88 } 89 90 void SetMethod(mirror::ArtMethod* m) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 91 ScopedObjectAccessUnchecked soa(Thread::Current()); 92 method_ = soa.EncodeMethod(m); 93 } 94 95 uint32_t DexPc() const { 96 return dex_pc_; 97 } 98 99 void SetDexPc(uint32_t pc) { 100 dex_pc_ = pc; 101 } 102 103 private: 104 jmethodID method_; 105 uint32_t dex_pc_; 106}; 107 108jobject Dbg::TypeCache::Add(mirror::Class* t) { 109 ScopedObjectAccessUnchecked soa(Thread::Current()); 110 int32_t hash_code = t->IdentityHashCode(); 111 auto range = objects_.equal_range(hash_code); 112 for (auto it = range.first; it != range.second; ++it) { 113 if (soa.Decode<mirror::Class*>(it->second) == t) { 114 // Found a matching weak global, return it. 115 return it->second; 116 } 117 } 118 JNIEnv* env = soa.Env(); 119 const jobject local_ref = soa.AddLocalReference<jobject>(t); 120 const jobject weak_global = env->NewWeakGlobalRef(local_ref); 121 env->DeleteLocalRef(local_ref); 122 objects_.insert(std::make_pair(hash_code, weak_global)); 123 return weak_global; 124} 125 126void Dbg::TypeCache::Clear() { 127 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 128 Thread* self = Thread::Current(); 129 for (const auto& p : objects_) { 130 vm->DeleteWeakGlobalRef(self, p.second); 131 } 132 objects_.clear(); 133} 134 135class AllocRecord { 136 public: 137 AllocRecord() : type_(nullptr), byte_count_(0), thin_lock_id_(0) {} 138 139 mirror::Class* Type() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 140 return down_cast<mirror::Class*>(Thread::Current()->DecodeJObject(type_)); 141 } 142 143 void SetType(mirror::Class* t) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, 144 Locks::alloc_tracker_lock_) { 145 type_ = Dbg::type_cache_.Add(t); 146 } 147 148 size_t GetDepth() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 149 size_t depth = 0; 150 while (depth < kMaxAllocRecordStackDepth && stack_[depth].Method() != NULL) { 151 ++depth; 152 } 153 return depth; 154 } 155 156 size_t ByteCount() const { 157 return byte_count_; 158 } 159 160 void SetByteCount(size_t count) { 161 byte_count_ = count; 162 } 163 164 uint16_t ThinLockId() const { 165 return thin_lock_id_; 166 } 167 168 void SetThinLockId(uint16_t id) { 169 thin_lock_id_ = id; 170 } 171 172 AllocRecordStackTraceElement* StackElement(size_t index) { 173 DCHECK_LT(index, kMaxAllocRecordStackDepth); 174 return &stack_[index]; 175 } 176 177 private: 178 jobject type_; // This is a weak global. 179 size_t byte_count_; 180 uint16_t thin_lock_id_; 181 AllocRecordStackTraceElement stack_[kMaxAllocRecordStackDepth]; // Unused entries have NULL method. 182}; 183 184class Breakpoint { 185 public: 186 Breakpoint(mirror::ArtMethod* method, uint32_t dex_pc, bool need_full_deoptimization) 187 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 188 : method_(nullptr), dex_pc_(dex_pc), need_full_deoptimization_(need_full_deoptimization) { 189 ScopedObjectAccessUnchecked soa(Thread::Current()); 190 method_ = soa.EncodeMethod(method); 191 } 192 193 Breakpoint(const Breakpoint& other) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 194 : method_(nullptr), dex_pc_(other.dex_pc_), 195 need_full_deoptimization_(other.need_full_deoptimization_) { 196 ScopedObjectAccessUnchecked soa(Thread::Current()); 197 method_ = soa.EncodeMethod(other.Method()); 198 } 199 200 mirror::ArtMethod* Method() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 201 ScopedObjectAccessUnchecked soa(Thread::Current()); 202 return soa.DecodeMethod(method_); 203 } 204 205 uint32_t DexPc() const { 206 return dex_pc_; 207 } 208 209 bool NeedFullDeoptimization() const { 210 return need_full_deoptimization_; 211 } 212 213 private: 214 // The location of this breakpoint. 215 jmethodID method_; 216 uint32_t dex_pc_; 217 218 // Indicates whether breakpoint needs full deoptimization or selective deoptimization. 219 bool need_full_deoptimization_; 220}; 221 222static std::ostream& operator<<(std::ostream& os, const Breakpoint& rhs) 223 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 224 os << StringPrintf("Breakpoint[%s @%#x]", PrettyMethod(rhs.Method()).c_str(), rhs.DexPc()); 225 return os; 226} 227 228class DebugInstrumentationListener FINAL : public instrumentation::InstrumentationListener { 229 public: 230 DebugInstrumentationListener() {} 231 virtual ~DebugInstrumentationListener() {} 232 233 void MethodEntered(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 234 uint32_t dex_pc) 235 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 236 if (method->IsNative()) { 237 // TODO: post location events is a suspension point and native method entry stubs aren't. 238 return; 239 } 240 Dbg::UpdateDebugger(thread, this_object, method, 0, Dbg::kMethodEntry, nullptr); 241 } 242 243 void MethodExited(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 244 uint32_t dex_pc, const JValue& return_value) 245 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 246 if (method->IsNative()) { 247 // TODO: post location events is a suspension point and native method entry stubs aren't. 248 return; 249 } 250 Dbg::UpdateDebugger(thread, this_object, method, dex_pc, Dbg::kMethodExit, &return_value); 251 } 252 253 void MethodUnwind(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 254 uint32_t dex_pc) 255 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 256 // We're not recorded to listen to this kind of event, so complain. 257 LOG(ERROR) << "Unexpected method unwind event in debugger " << PrettyMethod(method) 258 << " " << dex_pc; 259 } 260 261 void DexPcMoved(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 262 uint32_t new_dex_pc) 263 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 264 Dbg::UpdateDebugger(thread, this_object, method, new_dex_pc, 0, nullptr); 265 } 266 267 void FieldRead(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 268 uint32_t dex_pc, mirror::ArtField* field) 269 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 270 Dbg::PostFieldAccessEvent(method, dex_pc, this_object, field); 271 } 272 273 void FieldWritten(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 274 uint32_t dex_pc, mirror::ArtField* field, const JValue& field_value) 275 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 276 Dbg::PostFieldModificationEvent(method, dex_pc, this_object, field, &field_value); 277 } 278 279 void ExceptionCaught(Thread* thread, const ThrowLocation& throw_location, 280 mirror::ArtMethod* catch_method, uint32_t catch_dex_pc, 281 mirror::Throwable* exception_object) 282 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 283 Dbg::PostException(throw_location, catch_method, catch_dex_pc, exception_object); 284 } 285 286 private: 287 DISALLOW_COPY_AND_ASSIGN(DebugInstrumentationListener); 288} gDebugInstrumentationListener; 289 290// JDWP is allowed unless the Zygote forbids it. 291static bool gJdwpAllowed = true; 292 293// Was there a -Xrunjdwp or -agentlib:jdwp= argument on the command line? 294static bool gJdwpConfigured = false; 295 296// Broken-down JDWP options. (Only valid if IsJdwpConfigured() is true.) 297static JDWP::JdwpOptions gJdwpOptions; 298 299// Runtime JDWP state. 300static JDWP::JdwpState* gJdwpState = NULL; 301static bool gDebuggerConnected; // debugger or DDMS is connected. 302static bool gDebuggerActive; // debugger is making requests. 303static bool gDisposed; // debugger called VirtualMachine.Dispose, so we should drop the connection. 304 305static bool gDdmThreadNotification = false; 306 307// DDMS GC-related settings. 308static Dbg::HpifWhen gDdmHpifWhen = Dbg::HPIF_WHEN_NEVER; 309static Dbg::HpsgWhen gDdmHpsgWhen = Dbg::HPSG_WHEN_NEVER; 310static Dbg::HpsgWhat gDdmHpsgWhat; 311static Dbg::HpsgWhen gDdmNhsgWhen = Dbg::HPSG_WHEN_NEVER; 312static Dbg::HpsgWhat gDdmNhsgWhat; 313 314ObjectRegistry* Dbg::gRegistry = nullptr; 315 316// Recent allocation tracking. 317AllocRecord* Dbg::recent_allocation_records_ = nullptr; // TODO: CircularBuffer<AllocRecord> 318size_t Dbg::alloc_record_max_ = 0; 319size_t Dbg::alloc_record_head_ = 0; 320size_t Dbg::alloc_record_count_ = 0; 321Dbg::TypeCache Dbg::type_cache_; 322 323// Deoptimization support. 324std::vector<DeoptimizationRequest> Dbg::deoptimization_requests_; 325size_t Dbg::full_deoptimization_event_count_ = 0; 326size_t Dbg::delayed_full_undeoptimization_count_ = 0; 327 328// Instrumentation event reference counters. 329size_t Dbg::dex_pc_change_event_ref_count_ = 0; 330size_t Dbg::method_enter_event_ref_count_ = 0; 331size_t Dbg::method_exit_event_ref_count_ = 0; 332size_t Dbg::field_read_event_ref_count_ = 0; 333size_t Dbg::field_write_event_ref_count_ = 0; 334size_t Dbg::exception_catch_event_ref_count_ = 0; 335uint32_t Dbg::instrumentation_events_ = 0; 336 337// Breakpoints. 338static std::vector<Breakpoint> gBreakpoints GUARDED_BY(Locks::breakpoint_lock_); 339 340void DebugInvokeReq::VisitRoots(RootCallback* callback, void* arg, uint32_t tid, 341 RootType root_type) { 342 if (receiver != nullptr) { 343 callback(&receiver, arg, tid, root_type); 344 } 345 if (thread != nullptr) { 346 callback(&thread, arg, tid, root_type); 347 } 348 if (klass != nullptr) { 349 callback(reinterpret_cast<mirror::Object**>(&klass), arg, tid, root_type); 350 } 351 if (method != nullptr) { 352 callback(reinterpret_cast<mirror::Object**>(&method), arg, tid, root_type); 353 } 354} 355 356void DebugInvokeReq::Clear() { 357 invoke_needed = false; 358 receiver = nullptr; 359 thread = nullptr; 360 klass = nullptr; 361 method = nullptr; 362} 363 364void SingleStepControl::VisitRoots(RootCallback* callback, void* arg, uint32_t tid, 365 RootType root_type) { 366 if (method != nullptr) { 367 callback(reinterpret_cast<mirror::Object**>(&method), arg, tid, root_type); 368 } 369} 370 371bool SingleStepControl::ContainsDexPc(uint32_t dex_pc) const { 372 return dex_pcs.find(dex_pc) == dex_pcs.end(); 373} 374 375void SingleStepControl::Clear() { 376 is_active = false; 377 method = nullptr; 378 dex_pcs.clear(); 379} 380 381static bool IsBreakpoint(const mirror::ArtMethod* m, uint32_t dex_pc) 382 LOCKS_EXCLUDED(Locks::breakpoint_lock_) 383 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 384 ReaderMutexLock mu(Thread::Current(), *Locks::breakpoint_lock_); 385 for (size_t i = 0, e = gBreakpoints.size(); i < e; ++i) { 386 if (gBreakpoints[i].DexPc() == dex_pc && gBreakpoints[i].Method() == m) { 387 VLOG(jdwp) << "Hit breakpoint #" << i << ": " << gBreakpoints[i]; 388 return true; 389 } 390 } 391 return false; 392} 393 394static bool IsSuspendedForDebugger(ScopedObjectAccessUnchecked& soa, Thread* thread) 395 LOCKS_EXCLUDED(Locks::thread_suspend_count_lock_) { 396 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 397 // A thread may be suspended for GC; in this code, we really want to know whether 398 // there's a debugger suspension active. 399 return thread->IsSuspended() && thread->GetDebugSuspendCount() > 0; 400} 401 402static mirror::Array* DecodeArray(JDWP::RefTypeId id, JDWP::JdwpError& status) 403 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 404 mirror::Object* o = Dbg::GetObjectRegistry()->Get<mirror::Object*>(id); 405 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 406 status = JDWP::ERR_INVALID_OBJECT; 407 return NULL; 408 } 409 if (!o->IsArrayInstance()) { 410 status = JDWP::ERR_INVALID_ARRAY; 411 return NULL; 412 } 413 status = JDWP::ERR_NONE; 414 return o->AsArray(); 415} 416 417static mirror::Class* DecodeClass(JDWP::RefTypeId id, JDWP::JdwpError& status) 418 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 419 mirror::Object* o = Dbg::GetObjectRegistry()->Get<mirror::Object*>(id); 420 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 421 status = JDWP::ERR_INVALID_OBJECT; 422 return NULL; 423 } 424 if (!o->IsClass()) { 425 status = JDWP::ERR_INVALID_CLASS; 426 return NULL; 427 } 428 status = JDWP::ERR_NONE; 429 return o->AsClass(); 430} 431 432static JDWP::JdwpError DecodeThread(ScopedObjectAccessUnchecked& soa, JDWP::ObjectId thread_id, Thread*& thread) 433 EXCLUSIVE_LOCKS_REQUIRED(Locks::thread_list_lock_) 434 LOCKS_EXCLUDED(Locks::thread_suspend_count_lock_) 435 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 436 mirror::Object* thread_peer = Dbg::GetObjectRegistry()->Get<mirror::Object*>(thread_id); 437 if (thread_peer == NULL || thread_peer == ObjectRegistry::kInvalidObject) { 438 // This isn't even an object. 439 return JDWP::ERR_INVALID_OBJECT; 440 } 441 442 mirror::Class* java_lang_Thread = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread); 443 if (!java_lang_Thread->IsAssignableFrom(thread_peer->GetClass())) { 444 // This isn't a thread. 445 return JDWP::ERR_INVALID_THREAD; 446 } 447 448 thread = Thread::FromManagedThread(soa, thread_peer); 449 if (thread == NULL) { 450 // This is a java.lang.Thread without a Thread*. Must be a zombie. 451 return JDWP::ERR_THREAD_NOT_ALIVE; 452 } 453 return JDWP::ERR_NONE; 454} 455 456static JDWP::JdwpTag BasicTagFromDescriptor(const char* descriptor) { 457 // JDWP deliberately uses the descriptor characters' ASCII values for its enum. 458 // Note that by "basic" we mean that we don't get more specific than JT_OBJECT. 459 return static_cast<JDWP::JdwpTag>(descriptor[0]); 460} 461 462static JDWP::JdwpTag BasicTagFromClass(mirror::Class* klass) 463 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 464 std::string temp; 465 const char* descriptor = klass->GetDescriptor(&temp); 466 return BasicTagFromDescriptor(descriptor); 467} 468 469static JDWP::JdwpTag TagFromClass(const ScopedObjectAccessUnchecked& soa, mirror::Class* c) 470 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 471 CHECK(c != NULL); 472 if (c->IsArrayClass()) { 473 return JDWP::JT_ARRAY; 474 } 475 if (c->IsStringClass()) { 476 return JDWP::JT_STRING; 477 } 478 if (c->IsClassClass()) { 479 return JDWP::JT_CLASS_OBJECT; 480 } 481 { 482 mirror::Class* thread_class = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread); 483 if (thread_class->IsAssignableFrom(c)) { 484 return JDWP::JT_THREAD; 485 } 486 } 487 { 488 mirror::Class* thread_group_class = 489 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ThreadGroup); 490 if (thread_group_class->IsAssignableFrom(c)) { 491 return JDWP::JT_THREAD_GROUP; 492 } 493 } 494 { 495 mirror::Class* class_loader_class = 496 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ClassLoader); 497 if (class_loader_class->IsAssignableFrom(c)) { 498 return JDWP::JT_CLASS_LOADER; 499 } 500 } 501 return JDWP::JT_OBJECT; 502} 503 504/* 505 * Objects declared to hold Object might actually hold a more specific 506 * type. The debugger may take a special interest in these (e.g. it 507 * wants to display the contents of Strings), so we want to return an 508 * appropriate tag. 509 * 510 * Null objects are tagged JT_OBJECT. 511 */ 512JDWP::JdwpTag Dbg::TagFromObject(const ScopedObjectAccessUnchecked& soa, mirror::Object* o) { 513 return (o == NULL) ? JDWP::JT_OBJECT : TagFromClass(soa, o->GetClass()); 514} 515 516static bool IsPrimitiveTag(JDWP::JdwpTag tag) { 517 switch (tag) { 518 case JDWP::JT_BOOLEAN: 519 case JDWP::JT_BYTE: 520 case JDWP::JT_CHAR: 521 case JDWP::JT_FLOAT: 522 case JDWP::JT_DOUBLE: 523 case JDWP::JT_INT: 524 case JDWP::JT_LONG: 525 case JDWP::JT_SHORT: 526 case JDWP::JT_VOID: 527 return true; 528 default: 529 return false; 530 } 531} 532 533/* 534 * Handle one of the JDWP name/value pairs. 535 * 536 * JDWP options are: 537 * help: if specified, show help message and bail 538 * transport: may be dt_socket or dt_shmem 539 * address: for dt_socket, "host:port", or just "port" when listening 540 * server: if "y", wait for debugger to attach; if "n", attach to debugger 541 * timeout: how long to wait for debugger to connect / listen 542 * 543 * Useful with server=n (these aren't supported yet): 544 * onthrow=<exception-name>: connect to debugger when exception thrown 545 * onuncaught=y|n: connect to debugger when uncaught exception thrown 546 * launch=<command-line>: launch the debugger itself 547 * 548 * The "transport" option is required, as is "address" if server=n. 549 */ 550static bool ParseJdwpOption(const std::string& name, const std::string& value) { 551 if (name == "transport") { 552 if (value == "dt_socket") { 553 gJdwpOptions.transport = JDWP::kJdwpTransportSocket; 554 } else if (value == "dt_android_adb") { 555 gJdwpOptions.transport = JDWP::kJdwpTransportAndroidAdb; 556 } else { 557 LOG(ERROR) << "JDWP transport not supported: " << value; 558 return false; 559 } 560 } else if (name == "server") { 561 if (value == "n") { 562 gJdwpOptions.server = false; 563 } else if (value == "y") { 564 gJdwpOptions.server = true; 565 } else { 566 LOG(ERROR) << "JDWP option 'server' must be 'y' or 'n'"; 567 return false; 568 } 569 } else if (name == "suspend") { 570 if (value == "n") { 571 gJdwpOptions.suspend = false; 572 } else if (value == "y") { 573 gJdwpOptions.suspend = true; 574 } else { 575 LOG(ERROR) << "JDWP option 'suspend' must be 'y' or 'n'"; 576 return false; 577 } 578 } else if (name == "address") { 579 /* this is either <port> or <host>:<port> */ 580 std::string port_string; 581 gJdwpOptions.host.clear(); 582 std::string::size_type colon = value.find(':'); 583 if (colon != std::string::npos) { 584 gJdwpOptions.host = value.substr(0, colon); 585 port_string = value.substr(colon + 1); 586 } else { 587 port_string = value; 588 } 589 if (port_string.empty()) { 590 LOG(ERROR) << "JDWP address missing port: " << value; 591 return false; 592 } 593 char* end; 594 uint64_t port = strtoul(port_string.c_str(), &end, 10); 595 if (*end != '\0' || port > 0xffff) { 596 LOG(ERROR) << "JDWP address has junk in port field: " << value; 597 return false; 598 } 599 gJdwpOptions.port = port; 600 } else if (name == "launch" || name == "onthrow" || name == "oncaught" || name == "timeout") { 601 /* valid but unsupported */ 602 LOG(INFO) << "Ignoring JDWP option '" << name << "'='" << value << "'"; 603 } else { 604 LOG(INFO) << "Ignoring unrecognized JDWP option '" << name << "'='" << value << "'"; 605 } 606 607 return true; 608} 609 610/* 611 * Parse the latter half of a -Xrunjdwp/-agentlib:jdwp= string, e.g.: 612 * "transport=dt_socket,address=8000,server=y,suspend=n" 613 */ 614bool Dbg::ParseJdwpOptions(const std::string& options) { 615 VLOG(jdwp) << "ParseJdwpOptions: " << options; 616 617 std::vector<std::string> pairs; 618 Split(options, ',', pairs); 619 620 for (size_t i = 0; i < pairs.size(); ++i) { 621 std::string::size_type equals = pairs[i].find('='); 622 if (equals == std::string::npos) { 623 LOG(ERROR) << "Can't parse JDWP option '" << pairs[i] << "' in '" << options << "'"; 624 return false; 625 } 626 ParseJdwpOption(pairs[i].substr(0, equals), pairs[i].substr(equals + 1)); 627 } 628 629 if (gJdwpOptions.transport == JDWP::kJdwpTransportUnknown) { 630 LOG(ERROR) << "Must specify JDWP transport: " << options; 631 } 632 if (!gJdwpOptions.server && (gJdwpOptions.host.empty() || gJdwpOptions.port == 0)) { 633 LOG(ERROR) << "Must specify JDWP host and port when server=n: " << options; 634 return false; 635 } 636 637 gJdwpConfigured = true; 638 return true; 639} 640 641void Dbg::StartJdwp() { 642 if (!gJdwpAllowed || !IsJdwpConfigured()) { 643 // No JDWP for you! 644 return; 645 } 646 647 CHECK(gRegistry == nullptr); 648 gRegistry = new ObjectRegistry; 649 650 // Init JDWP if the debugger is enabled. This may connect out to a 651 // debugger, passively listen for a debugger, or block waiting for a 652 // debugger. 653 gJdwpState = JDWP::JdwpState::Create(&gJdwpOptions); 654 if (gJdwpState == NULL) { 655 // We probably failed because some other process has the port already, which means that 656 // if we don't abort the user is likely to think they're talking to us when they're actually 657 // talking to that other process. 658 LOG(FATAL) << "Debugger thread failed to initialize"; 659 } 660 661 // If a debugger has already attached, send the "welcome" message. 662 // This may cause us to suspend all threads. 663 if (gJdwpState->IsActive()) { 664 ScopedObjectAccess soa(Thread::Current()); 665 if (!gJdwpState->PostVMStart()) { 666 LOG(WARNING) << "Failed to post 'start' message to debugger"; 667 } 668 } 669} 670 671void Dbg::StopJdwp() { 672 // Post VM_DEATH event before the JDWP connection is closed (either by the JDWP thread or the 673 // destruction of gJdwpState). 674 if (gJdwpState != nullptr && gJdwpState->IsActive()) { 675 gJdwpState->PostVMDeath(); 676 } 677 // Prevent the JDWP thread from processing JDWP incoming packets after we close the connection. 678 Disposed(); 679 delete gJdwpState; 680 gJdwpState = nullptr; 681 delete gRegistry; 682 gRegistry = nullptr; 683} 684 685void Dbg::GcDidFinish() { 686 if (gDdmHpifWhen != HPIF_WHEN_NEVER) { 687 ScopedObjectAccess soa(Thread::Current()); 688 VLOG(jdwp) << "Sending heap info to DDM"; 689 DdmSendHeapInfo(gDdmHpifWhen); 690 } 691 if (gDdmHpsgWhen != HPSG_WHEN_NEVER) { 692 ScopedObjectAccess soa(Thread::Current()); 693 VLOG(jdwp) << "Dumping heap to DDM"; 694 DdmSendHeapSegments(false); 695 } 696 if (gDdmNhsgWhen != HPSG_WHEN_NEVER) { 697 ScopedObjectAccess soa(Thread::Current()); 698 VLOG(jdwp) << "Dumping native heap to DDM"; 699 DdmSendHeapSegments(true); 700 } 701} 702 703void Dbg::SetJdwpAllowed(bool allowed) { 704 gJdwpAllowed = allowed; 705} 706 707DebugInvokeReq* Dbg::GetInvokeReq() { 708 return Thread::Current()->GetInvokeReq(); 709} 710 711Thread* Dbg::GetDebugThread() { 712 return (gJdwpState != NULL) ? gJdwpState->GetDebugThread() : NULL; 713} 714 715void Dbg::ClearWaitForEventThread() { 716 gJdwpState->ClearWaitForEventThread(); 717} 718 719void Dbg::Connected() { 720 CHECK(!gDebuggerConnected); 721 VLOG(jdwp) << "JDWP has attached"; 722 gDebuggerConnected = true; 723 gDisposed = false; 724} 725 726void Dbg::Disposed() { 727 gDisposed = true; 728} 729 730bool Dbg::IsDisposed() { 731 return gDisposed; 732} 733 734void Dbg::GoActive() { 735 // Enable all debugging features, including scans for breakpoints. 736 // This is a no-op if we're already active. 737 // Only called from the JDWP handler thread. 738 if (gDebuggerActive) { 739 return; 740 } 741 742 { 743 // TODO: dalvik only warned if there were breakpoints left over. clear in Dbg::Disconnected? 744 ReaderMutexLock mu(Thread::Current(), *Locks::breakpoint_lock_); 745 CHECK_EQ(gBreakpoints.size(), 0U); 746 } 747 748 { 749 MutexLock mu(Thread::Current(), *Locks::deoptimization_lock_); 750 CHECK_EQ(deoptimization_requests_.size(), 0U); 751 CHECK_EQ(full_deoptimization_event_count_, 0U); 752 CHECK_EQ(delayed_full_undeoptimization_count_, 0U); 753 CHECK_EQ(dex_pc_change_event_ref_count_, 0U); 754 CHECK_EQ(method_enter_event_ref_count_, 0U); 755 CHECK_EQ(method_exit_event_ref_count_, 0U); 756 CHECK_EQ(field_read_event_ref_count_, 0U); 757 CHECK_EQ(field_write_event_ref_count_, 0U); 758 CHECK_EQ(exception_catch_event_ref_count_, 0U); 759 } 760 761 Runtime* runtime = Runtime::Current(); 762 runtime->GetThreadList()->SuspendAll(); 763 Thread* self = Thread::Current(); 764 ThreadState old_state = self->SetStateUnsafe(kRunnable); 765 CHECK_NE(old_state, kRunnable); 766 runtime->GetInstrumentation()->EnableDeoptimization(); 767 instrumentation_events_ = 0; 768 gDebuggerActive = true; 769 CHECK_EQ(self->SetStateUnsafe(old_state), kRunnable); 770 runtime->GetThreadList()->ResumeAll(); 771 772 LOG(INFO) << "Debugger is active"; 773} 774 775void Dbg::Disconnected() { 776 CHECK(gDebuggerConnected); 777 778 LOG(INFO) << "Debugger is no longer active"; 779 780 // Suspend all threads and exclusively acquire the mutator lock. Set the state of the thread 781 // to kRunnable to avoid scoped object access transitions. Remove the debugger as a listener 782 // and clear the object registry. 783 Runtime* runtime = Runtime::Current(); 784 runtime->GetThreadList()->SuspendAll(); 785 Thread* self = Thread::Current(); 786 ThreadState old_state = self->SetStateUnsafe(kRunnable); 787 788 // Debugger may not be active at this point. 789 if (gDebuggerActive) { 790 { 791 // Since we're going to disable deoptimization, we clear the deoptimization requests queue. 792 // This prevents us from having any pending deoptimization request when the debugger attaches 793 // to us again while no event has been requested yet. 794 MutexLock mu(Thread::Current(), *Locks::deoptimization_lock_); 795 deoptimization_requests_.clear(); 796 full_deoptimization_event_count_ = 0U; 797 delayed_full_undeoptimization_count_ = 0U; 798 } 799 if (instrumentation_events_ != 0) { 800 runtime->GetInstrumentation()->RemoveListener(&gDebugInstrumentationListener, 801 instrumentation_events_); 802 instrumentation_events_ = 0; 803 } 804 runtime->GetInstrumentation()->DisableDeoptimization(); 805 gDebuggerActive = false; 806 } 807 gRegistry->Clear(); 808 gDebuggerConnected = false; 809 CHECK_EQ(self->SetStateUnsafe(old_state), kRunnable); 810 runtime->GetThreadList()->ResumeAll(); 811} 812 813bool Dbg::IsDebuggerActive() { 814 return gDebuggerActive; 815} 816 817bool Dbg::IsJdwpConfigured() { 818 return gJdwpConfigured; 819} 820 821int64_t Dbg::LastDebuggerActivity() { 822 return gJdwpState->LastDebuggerActivity(); 823} 824 825void Dbg::UndoDebuggerSuspensions() { 826 Runtime::Current()->GetThreadList()->UndoDebuggerSuspensions(); 827} 828 829std::string Dbg::GetClassName(JDWP::RefTypeId class_id) { 830 mirror::Object* o = gRegistry->Get<mirror::Object*>(class_id); 831 if (o == NULL) { 832 return "NULL"; 833 } 834 if (o == ObjectRegistry::kInvalidObject) { 835 return StringPrintf("invalid object %p", reinterpret_cast<void*>(class_id)); 836 } 837 if (!o->IsClass()) { 838 return StringPrintf("non-class %p", o); // This is only used for debugging output anyway. 839 } 840 return GetClassName(o->AsClass()); 841} 842 843std::string Dbg::GetClassName(mirror::Class* klass) { 844 if (klass == nullptr) { 845 return "NULL"; 846 } 847 std::string temp; 848 return DescriptorToName(klass->GetDescriptor(&temp)); 849} 850 851JDWP::JdwpError Dbg::GetClassObject(JDWP::RefTypeId id, JDWP::ObjectId& class_object_id) { 852 JDWP::JdwpError status; 853 mirror::Class* c = DecodeClass(id, status); 854 if (c == NULL) { 855 return status; 856 } 857 class_object_id = gRegistry->Add(c); 858 return JDWP::ERR_NONE; 859} 860 861JDWP::JdwpError Dbg::GetSuperclass(JDWP::RefTypeId id, JDWP::RefTypeId& superclass_id) { 862 JDWP::JdwpError status; 863 mirror::Class* c = DecodeClass(id, status); 864 if (c == NULL) { 865 return status; 866 } 867 if (c->IsInterface()) { 868 // http://code.google.com/p/android/issues/detail?id=20856 869 superclass_id = 0; 870 } else { 871 superclass_id = gRegistry->Add(c->GetSuperClass()); 872 } 873 return JDWP::ERR_NONE; 874} 875 876JDWP::JdwpError Dbg::GetClassLoader(JDWP::RefTypeId id, JDWP::ExpandBuf* pReply) { 877 mirror::Object* o = gRegistry->Get<mirror::Object*>(id); 878 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 879 return JDWP::ERR_INVALID_OBJECT; 880 } 881 expandBufAddObjectId(pReply, gRegistry->Add(o->GetClass()->GetClassLoader())); 882 return JDWP::ERR_NONE; 883} 884 885JDWP::JdwpError Dbg::GetModifiers(JDWP::RefTypeId id, JDWP::ExpandBuf* pReply) { 886 JDWP::JdwpError status; 887 mirror::Class* c = DecodeClass(id, status); 888 if (c == NULL) { 889 return status; 890 } 891 892 uint32_t access_flags = c->GetAccessFlags() & kAccJavaFlagsMask; 893 894 // Set ACC_SUPER. Dex files don't contain this flag but only classes are supposed to have it set, 895 // not interfaces. 896 // Class.getModifiers doesn't return it, but JDWP does, so we set it here. 897 if ((access_flags & kAccInterface) == 0) { 898 access_flags |= kAccSuper; 899 } 900 901 expandBufAdd4BE(pReply, access_flags); 902 903 return JDWP::ERR_NONE; 904} 905 906JDWP::JdwpError Dbg::GetMonitorInfo(JDWP::ObjectId object_id, JDWP::ExpandBuf* reply) 907 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 908 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id); 909 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 910 return JDWP::ERR_INVALID_OBJECT; 911 } 912 913 // Ensure all threads are suspended while we read objects' lock words. 914 Thread* self = Thread::Current(); 915 CHECK_EQ(self->GetState(), kRunnable); 916 self->TransitionFromRunnableToSuspended(kSuspended); 917 Runtime::Current()->GetThreadList()->SuspendAll(); 918 919 MonitorInfo monitor_info(o); 920 921 Runtime::Current()->GetThreadList()->ResumeAll(); 922 self->TransitionFromSuspendedToRunnable(); 923 924 if (monitor_info.owner_ != NULL) { 925 expandBufAddObjectId(reply, gRegistry->Add(monitor_info.owner_->GetPeer())); 926 } else { 927 expandBufAddObjectId(reply, gRegistry->Add(NULL)); 928 } 929 expandBufAdd4BE(reply, monitor_info.entry_count_); 930 expandBufAdd4BE(reply, monitor_info.waiters_.size()); 931 for (size_t i = 0; i < monitor_info.waiters_.size(); ++i) { 932 expandBufAddObjectId(reply, gRegistry->Add(monitor_info.waiters_[i]->GetPeer())); 933 } 934 return JDWP::ERR_NONE; 935} 936 937JDWP::JdwpError Dbg::GetOwnedMonitors(JDWP::ObjectId thread_id, 938 std::vector<JDWP::ObjectId>& monitors, 939 std::vector<uint32_t>& stack_depths) { 940 struct OwnedMonitorVisitor : public StackVisitor { 941 OwnedMonitorVisitor(Thread* thread, Context* context, 942 std::vector<JDWP::ObjectId>* monitor_vector, 943 std::vector<uint32_t>* stack_depth_vector) 944 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 945 : StackVisitor(thread, context), current_stack_depth(0), 946 monitors(monitor_vector), stack_depths(stack_depth_vector) {} 947 948 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 949 // annotalysis. 950 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 951 if (!GetMethod()->IsRuntimeMethod()) { 952 Monitor::VisitLocks(this, AppendOwnedMonitors, this); 953 ++current_stack_depth; 954 } 955 return true; 956 } 957 958 static void AppendOwnedMonitors(mirror::Object* owned_monitor, void* arg) 959 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 960 OwnedMonitorVisitor* visitor = reinterpret_cast<OwnedMonitorVisitor*>(arg); 961 visitor->monitors->push_back(gRegistry->Add(owned_monitor)); 962 visitor->stack_depths->push_back(visitor->current_stack_depth); 963 } 964 965 size_t current_stack_depth; 966 std::vector<JDWP::ObjectId>* monitors; 967 std::vector<uint32_t>* stack_depths; 968 }; 969 970 ScopedObjectAccessUnchecked soa(Thread::Current()); 971 Thread* thread; 972 { 973 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 974 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 975 if (error != JDWP::ERR_NONE) { 976 return error; 977 } 978 if (!IsSuspendedForDebugger(soa, thread)) { 979 return JDWP::ERR_THREAD_NOT_SUSPENDED; 980 } 981 } 982 std::unique_ptr<Context> context(Context::Create()); 983 OwnedMonitorVisitor visitor(thread, context.get(), &monitors, &stack_depths); 984 visitor.WalkStack(); 985 return JDWP::ERR_NONE; 986} 987 988JDWP::JdwpError Dbg::GetContendedMonitor(JDWP::ObjectId thread_id, 989 JDWP::ObjectId& contended_monitor) { 990 mirror::Object* contended_monitor_obj; 991 ScopedObjectAccessUnchecked soa(Thread::Current()); 992 { 993 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 994 Thread* thread; 995 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 996 if (error != JDWP::ERR_NONE) { 997 return error; 998 } 999 if (!IsSuspendedForDebugger(soa, thread)) { 1000 return JDWP::ERR_THREAD_NOT_SUSPENDED; 1001 } 1002 contended_monitor_obj = Monitor::GetContendedMonitor(thread); 1003 } 1004 // Add() requires the thread_list_lock_ not held to avoid the lock 1005 // level violation. 1006 contended_monitor = gRegistry->Add(contended_monitor_obj); 1007 return JDWP::ERR_NONE; 1008} 1009 1010JDWP::JdwpError Dbg::GetInstanceCounts(const std::vector<JDWP::RefTypeId>& class_ids, 1011 std::vector<uint64_t>& counts) 1012 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1013 gc::Heap* heap = Runtime::Current()->GetHeap(); 1014 heap->CollectGarbage(false); 1015 std::vector<mirror::Class*> classes; 1016 counts.clear(); 1017 for (size_t i = 0; i < class_ids.size(); ++i) { 1018 JDWP::JdwpError status; 1019 mirror::Class* c = DecodeClass(class_ids[i], status); 1020 if (c == NULL) { 1021 return status; 1022 } 1023 classes.push_back(c); 1024 counts.push_back(0); 1025 } 1026 heap->CountInstances(classes, false, &counts[0]); 1027 return JDWP::ERR_NONE; 1028} 1029 1030JDWP::JdwpError Dbg::GetInstances(JDWP::RefTypeId class_id, int32_t max_count, std::vector<JDWP::ObjectId>& instances) 1031 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1032 gc::Heap* heap = Runtime::Current()->GetHeap(); 1033 // We only want reachable instances, so do a GC. 1034 heap->CollectGarbage(false); 1035 JDWP::JdwpError status; 1036 mirror::Class* c = DecodeClass(class_id, status); 1037 if (c == nullptr) { 1038 return status; 1039 } 1040 std::vector<mirror::Object*> raw_instances; 1041 Runtime::Current()->GetHeap()->GetInstances(c, max_count, raw_instances); 1042 for (size_t i = 0; i < raw_instances.size(); ++i) { 1043 instances.push_back(gRegistry->Add(raw_instances[i])); 1044 } 1045 return JDWP::ERR_NONE; 1046} 1047 1048JDWP::JdwpError Dbg::GetReferringObjects(JDWP::ObjectId object_id, int32_t max_count, 1049 std::vector<JDWP::ObjectId>& referring_objects) 1050 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1051 gc::Heap* heap = Runtime::Current()->GetHeap(); 1052 heap->CollectGarbage(false); 1053 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id); 1054 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 1055 return JDWP::ERR_INVALID_OBJECT; 1056 } 1057 std::vector<mirror::Object*> raw_instances; 1058 heap->GetReferringObjects(o, max_count, raw_instances); 1059 for (size_t i = 0; i < raw_instances.size(); ++i) { 1060 referring_objects.push_back(gRegistry->Add(raw_instances[i])); 1061 } 1062 return JDWP::ERR_NONE; 1063} 1064 1065JDWP::JdwpError Dbg::DisableCollection(JDWP::ObjectId object_id) 1066 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1067 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id); 1068 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 1069 return JDWP::ERR_INVALID_OBJECT; 1070 } 1071 gRegistry->DisableCollection(object_id); 1072 return JDWP::ERR_NONE; 1073} 1074 1075JDWP::JdwpError Dbg::EnableCollection(JDWP::ObjectId object_id) 1076 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1077 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id); 1078 // Unlike DisableCollection, JDWP specs do not state an invalid object causes an error. The RI 1079 // also ignores these cases and never return an error. However it's not obvious why this command 1080 // should behave differently from DisableCollection and IsCollected commands. So let's be more 1081 // strict and return an error if this happens. 1082 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 1083 return JDWP::ERR_INVALID_OBJECT; 1084 } 1085 gRegistry->EnableCollection(object_id); 1086 return JDWP::ERR_NONE; 1087} 1088 1089JDWP::JdwpError Dbg::IsCollected(JDWP::ObjectId object_id, bool& is_collected) 1090 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1091 if (object_id == 0) { 1092 // Null object id is invalid. 1093 return JDWP::ERR_INVALID_OBJECT; 1094 } 1095 // JDWP specs state an INVALID_OBJECT error is returned if the object ID is not valid. However 1096 // the RI seems to ignore this and assume object has been collected. 1097 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id); 1098 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 1099 is_collected = true; 1100 } else { 1101 is_collected = gRegistry->IsCollected(object_id); 1102 } 1103 return JDWP::ERR_NONE; 1104} 1105 1106void Dbg::DisposeObject(JDWP::ObjectId object_id, uint32_t reference_count) 1107 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1108 gRegistry->DisposeObject(object_id, reference_count); 1109} 1110 1111JDWP::JdwpTypeTag Dbg::GetTypeTag(mirror::Class* klass) { 1112 DCHECK(klass != nullptr); 1113 if (klass->IsArrayClass()) { 1114 return JDWP::TT_ARRAY; 1115 } else if (klass->IsInterface()) { 1116 return JDWP::TT_INTERFACE; 1117 } else { 1118 return JDWP::TT_CLASS; 1119 } 1120} 1121 1122JDWP::JdwpError Dbg::GetReflectedType(JDWP::RefTypeId class_id, JDWP::ExpandBuf* pReply) { 1123 JDWP::JdwpError status; 1124 mirror::Class* c = DecodeClass(class_id, status); 1125 if (c == NULL) { 1126 return status; 1127 } 1128 1129 JDWP::JdwpTypeTag type_tag = GetTypeTag(c); 1130 expandBufAdd1(pReply, type_tag); 1131 expandBufAddRefTypeId(pReply, class_id); 1132 return JDWP::ERR_NONE; 1133} 1134 1135void Dbg::GetClassList(std::vector<JDWP::RefTypeId>& classes) { 1136 // Get the complete list of reference classes (i.e. all classes except 1137 // the primitive types). 1138 // Returns a newly-allocated buffer full of RefTypeId values. 1139 struct ClassListCreator { 1140 explicit ClassListCreator(std::vector<JDWP::RefTypeId>& classes) : classes(classes) { 1141 } 1142 1143 static bool Visit(mirror::Class* c, void* arg) { 1144 return reinterpret_cast<ClassListCreator*>(arg)->Visit(c); 1145 } 1146 1147 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 1148 // annotalysis. 1149 bool Visit(mirror::Class* c) NO_THREAD_SAFETY_ANALYSIS { 1150 if (!c->IsPrimitive()) { 1151 classes.push_back(gRegistry->AddRefType(c)); 1152 } 1153 return true; 1154 } 1155 1156 std::vector<JDWP::RefTypeId>& classes; 1157 }; 1158 1159 ClassListCreator clc(classes); 1160 Runtime::Current()->GetClassLinker()->VisitClassesWithoutClassesLock(ClassListCreator::Visit, 1161 &clc); 1162} 1163 1164JDWP::JdwpError Dbg::GetClassInfo(JDWP::RefTypeId class_id, JDWP::JdwpTypeTag* pTypeTag, 1165 uint32_t* pStatus, std::string* pDescriptor) { 1166 JDWP::JdwpError status; 1167 mirror::Class* c = DecodeClass(class_id, status); 1168 if (c == NULL) { 1169 return status; 1170 } 1171 1172 if (c->IsArrayClass()) { 1173 *pStatus = JDWP::CS_VERIFIED | JDWP::CS_PREPARED; 1174 *pTypeTag = JDWP::TT_ARRAY; 1175 } else { 1176 if (c->IsErroneous()) { 1177 *pStatus = JDWP::CS_ERROR; 1178 } else { 1179 *pStatus = JDWP::CS_VERIFIED | JDWP::CS_PREPARED | JDWP::CS_INITIALIZED; 1180 } 1181 *pTypeTag = c->IsInterface() ? JDWP::TT_INTERFACE : JDWP::TT_CLASS; 1182 } 1183 1184 if (pDescriptor != NULL) { 1185 std::string temp; 1186 *pDescriptor = c->GetDescriptor(&temp); 1187 } 1188 return JDWP::ERR_NONE; 1189} 1190 1191void Dbg::FindLoadedClassBySignature(const char* descriptor, std::vector<JDWP::RefTypeId>& ids) { 1192 std::vector<mirror::Class*> classes; 1193 Runtime::Current()->GetClassLinker()->LookupClasses(descriptor, classes); 1194 ids.clear(); 1195 for (size_t i = 0; i < classes.size(); ++i) { 1196 ids.push_back(gRegistry->Add(classes[i])); 1197 } 1198} 1199 1200JDWP::JdwpError Dbg::GetReferenceType(JDWP::ObjectId object_id, JDWP::ExpandBuf* pReply) 1201 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1202 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id); 1203 if (o == NULL || o == ObjectRegistry::kInvalidObject) { 1204 return JDWP::ERR_INVALID_OBJECT; 1205 } 1206 1207 JDWP::JdwpTypeTag type_tag = GetTypeTag(o->GetClass()); 1208 JDWP::RefTypeId type_id = gRegistry->AddRefType(o->GetClass()); 1209 1210 expandBufAdd1(pReply, type_tag); 1211 expandBufAddRefTypeId(pReply, type_id); 1212 1213 return JDWP::ERR_NONE; 1214} 1215 1216JDWP::JdwpError Dbg::GetSignature(JDWP::RefTypeId class_id, std::string* signature) { 1217 JDWP::JdwpError status; 1218 mirror::Class* c = DecodeClass(class_id, status); 1219 if (c == NULL) { 1220 return status; 1221 } 1222 std::string temp; 1223 *signature = c->GetDescriptor(&temp); 1224 return JDWP::ERR_NONE; 1225} 1226 1227JDWP::JdwpError Dbg::GetSourceFile(JDWP::RefTypeId class_id, std::string& result) { 1228 JDWP::JdwpError status; 1229 mirror::Class* c = DecodeClass(class_id, status); 1230 if (c == nullptr) { 1231 return status; 1232 } 1233 const char* source_file = c->GetSourceFile(); 1234 if (source_file == nullptr) { 1235 return JDWP::ERR_ABSENT_INFORMATION; 1236 } 1237 result = source_file; 1238 return JDWP::ERR_NONE; 1239} 1240 1241JDWP::JdwpError Dbg::GetObjectTag(JDWP::ObjectId object_id, uint8_t& tag) { 1242 ScopedObjectAccessUnchecked soa(Thread::Current()); 1243 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id); 1244 if (o == ObjectRegistry::kInvalidObject) { 1245 return JDWP::ERR_INVALID_OBJECT; 1246 } 1247 tag = TagFromObject(soa, o); 1248 return JDWP::ERR_NONE; 1249} 1250 1251size_t Dbg::GetTagWidth(JDWP::JdwpTag tag) { 1252 switch (tag) { 1253 case JDWP::JT_VOID: 1254 return 0; 1255 case JDWP::JT_BYTE: 1256 case JDWP::JT_BOOLEAN: 1257 return 1; 1258 case JDWP::JT_CHAR: 1259 case JDWP::JT_SHORT: 1260 return 2; 1261 case JDWP::JT_FLOAT: 1262 case JDWP::JT_INT: 1263 return 4; 1264 case JDWP::JT_ARRAY: 1265 case JDWP::JT_OBJECT: 1266 case JDWP::JT_STRING: 1267 case JDWP::JT_THREAD: 1268 case JDWP::JT_THREAD_GROUP: 1269 case JDWP::JT_CLASS_LOADER: 1270 case JDWP::JT_CLASS_OBJECT: 1271 return sizeof(JDWP::ObjectId); 1272 case JDWP::JT_DOUBLE: 1273 case JDWP::JT_LONG: 1274 return 8; 1275 default: 1276 LOG(FATAL) << "Unknown tag " << tag; 1277 return -1; 1278 } 1279} 1280 1281JDWP::JdwpError Dbg::GetArrayLength(JDWP::ObjectId array_id, int& length) { 1282 JDWP::JdwpError status; 1283 mirror::Array* a = DecodeArray(array_id, status); 1284 if (a == NULL) { 1285 return status; 1286 } 1287 length = a->GetLength(); 1288 return JDWP::ERR_NONE; 1289} 1290 1291JDWP::JdwpError Dbg::OutputArray(JDWP::ObjectId array_id, int offset, int count, JDWP::ExpandBuf* pReply) { 1292 JDWP::JdwpError status; 1293 mirror::Array* a = DecodeArray(array_id, status); 1294 if (a == nullptr) { 1295 return status; 1296 } 1297 1298 if (offset < 0 || count < 0 || offset > a->GetLength() || a->GetLength() - offset < count) { 1299 LOG(WARNING) << __FUNCTION__ << " access out of bounds: offset=" << offset << "; count=" << count; 1300 return JDWP::ERR_INVALID_LENGTH; 1301 } 1302 JDWP::JdwpTag element_tag = BasicTagFromClass(a->GetClass()->GetComponentType()); 1303 expandBufAdd1(pReply, element_tag); 1304 expandBufAdd4BE(pReply, count); 1305 1306 if (IsPrimitiveTag(element_tag)) { 1307 size_t width = GetTagWidth(element_tag); 1308 uint8_t* dst = expandBufAddSpace(pReply, count * width); 1309 if (width == 8) { 1310 const uint64_t* src8 = reinterpret_cast<uint64_t*>(a->GetRawData(sizeof(uint64_t), 0)); 1311 for (int i = 0; i < count; ++i) JDWP::Write8BE(&dst, src8[offset + i]); 1312 } else if (width == 4) { 1313 const uint32_t* src4 = reinterpret_cast<uint32_t*>(a->GetRawData(sizeof(uint32_t), 0)); 1314 for (int i = 0; i < count; ++i) JDWP::Write4BE(&dst, src4[offset + i]); 1315 } else if (width == 2) { 1316 const uint16_t* src2 = reinterpret_cast<uint16_t*>(a->GetRawData(sizeof(uint16_t), 0)); 1317 for (int i = 0; i < count; ++i) JDWP::Write2BE(&dst, src2[offset + i]); 1318 } else { 1319 const uint8_t* src = reinterpret_cast<uint8_t*>(a->GetRawData(sizeof(uint8_t), 0)); 1320 memcpy(dst, &src[offset * width], count * width); 1321 } 1322 } else { 1323 ScopedObjectAccessUnchecked soa(Thread::Current()); 1324 mirror::ObjectArray<mirror::Object>* oa = a->AsObjectArray<mirror::Object>(); 1325 for (int i = 0; i < count; ++i) { 1326 mirror::Object* element = oa->Get(offset + i); 1327 JDWP::JdwpTag specific_tag = (element != nullptr) ? TagFromObject(soa, element) 1328 : element_tag; 1329 expandBufAdd1(pReply, specific_tag); 1330 expandBufAddObjectId(pReply, gRegistry->Add(element)); 1331 } 1332 } 1333 1334 return JDWP::ERR_NONE; 1335} 1336 1337template <typename T> 1338static void CopyArrayData(mirror::Array* a, JDWP::Request& src, int offset, int count) 1339 NO_THREAD_SAFETY_ANALYSIS { 1340 // TODO: fix when annotalysis correctly handles non-member functions. 1341 DCHECK(a->GetClass()->IsPrimitiveArray()); 1342 1343 T* dst = reinterpret_cast<T*>(a->GetRawData(sizeof(T), offset)); 1344 for (int i = 0; i < count; ++i) { 1345 *dst++ = src.ReadValue(sizeof(T)); 1346 } 1347} 1348 1349JDWP::JdwpError Dbg::SetArrayElements(JDWP::ObjectId array_id, int offset, int count, 1350 JDWP::Request& request) 1351 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1352 JDWP::JdwpError status; 1353 mirror::Array* dst = DecodeArray(array_id, status); 1354 if (dst == NULL) { 1355 return status; 1356 } 1357 1358 if (offset < 0 || count < 0 || offset > dst->GetLength() || dst->GetLength() - offset < count) { 1359 LOG(WARNING) << __FUNCTION__ << " access out of bounds: offset=" << offset << "; count=" << count; 1360 return JDWP::ERR_INVALID_LENGTH; 1361 } 1362 JDWP::JdwpTag element_tag = BasicTagFromClass(dst->GetClass()->GetComponentType()); 1363 1364 if (IsPrimitiveTag(element_tag)) { 1365 size_t width = GetTagWidth(element_tag); 1366 if (width == 8) { 1367 CopyArrayData<uint64_t>(dst, request, offset, count); 1368 } else if (width == 4) { 1369 CopyArrayData<uint32_t>(dst, request, offset, count); 1370 } else if (width == 2) { 1371 CopyArrayData<uint16_t>(dst, request, offset, count); 1372 } else { 1373 CopyArrayData<uint8_t>(dst, request, offset, count); 1374 } 1375 } else { 1376 mirror::ObjectArray<mirror::Object>* oa = dst->AsObjectArray<mirror::Object>(); 1377 for (int i = 0; i < count; ++i) { 1378 JDWP::ObjectId id = request.ReadObjectId(); 1379 mirror::Object* o = gRegistry->Get<mirror::Object*>(id); 1380 if (o == ObjectRegistry::kInvalidObject) { 1381 return JDWP::ERR_INVALID_OBJECT; 1382 } 1383 oa->Set<false>(offset + i, o); 1384 } 1385 } 1386 1387 return JDWP::ERR_NONE; 1388} 1389 1390JDWP::ObjectId Dbg::CreateString(const std::string& str) { 1391 return gRegistry->Add(mirror::String::AllocFromModifiedUtf8(Thread::Current(), str.c_str())); 1392} 1393 1394JDWP::JdwpError Dbg::CreateObject(JDWP::RefTypeId class_id, JDWP::ObjectId& new_object) { 1395 JDWP::JdwpError status; 1396 mirror::Class* c = DecodeClass(class_id, status); 1397 if (c == NULL) { 1398 return status; 1399 } 1400 new_object = gRegistry->Add(c->AllocObject(Thread::Current())); 1401 return JDWP::ERR_NONE; 1402} 1403 1404/* 1405 * Used by Eclipse's "Display" view to evaluate "new byte[5]" to get "(byte[]) [0, 0, 0, 0, 0]". 1406 */ 1407JDWP::JdwpError Dbg::CreateArrayObject(JDWP::RefTypeId array_class_id, uint32_t length, 1408 JDWP::ObjectId& new_array) { 1409 JDWP::JdwpError status; 1410 mirror::Class* c = DecodeClass(array_class_id, status); 1411 if (c == NULL) { 1412 return status; 1413 } 1414 new_array = gRegistry->Add(mirror::Array::Alloc<true>(Thread::Current(), c, length, 1415 c->GetComponentSize(), 1416 Runtime::Current()->GetHeap()->GetCurrentAllocator())); 1417 return JDWP::ERR_NONE; 1418} 1419 1420JDWP::FieldId Dbg::ToFieldId(const mirror::ArtField* f) { 1421 CHECK(!kMovingFields); 1422 return static_cast<JDWP::FieldId>(reinterpret_cast<uintptr_t>(f)); 1423} 1424 1425static JDWP::MethodId ToMethodId(const mirror::ArtMethod* m) 1426 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1427 CHECK(!kMovingMethods); 1428 return static_cast<JDWP::MethodId>(reinterpret_cast<uintptr_t>(m)); 1429} 1430 1431static mirror::ArtField* FromFieldId(JDWP::FieldId fid) 1432 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1433 CHECK(!kMovingFields); 1434 return reinterpret_cast<mirror::ArtField*>(static_cast<uintptr_t>(fid)); 1435} 1436 1437static mirror::ArtMethod* FromMethodId(JDWP::MethodId mid) 1438 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1439 CHECK(!kMovingMethods); 1440 return reinterpret_cast<mirror::ArtMethod*>(static_cast<uintptr_t>(mid)); 1441} 1442 1443bool Dbg::MatchThread(JDWP::ObjectId expected_thread_id, Thread* event_thread) { 1444 CHECK(event_thread != nullptr); 1445 mirror::Object* expected_thread_peer = gRegistry->Get<mirror::Object*>(expected_thread_id); 1446 return expected_thread_peer == event_thread->GetPeer(); 1447} 1448 1449bool Dbg::MatchLocation(const JDWP::JdwpLocation& expected_location, 1450 const JDWP::EventLocation& event_location) { 1451 if (expected_location.dex_pc != event_location.dex_pc) { 1452 return false; 1453 } 1454 mirror::ArtMethod* m = FromMethodId(expected_location.method_id); 1455 return m == event_location.method; 1456} 1457 1458bool Dbg::MatchType(mirror::Class* event_class, JDWP::RefTypeId class_id) { 1459 if (event_class == nullptr) { 1460 return false; 1461 } 1462 JDWP::JdwpError status; 1463 mirror::Class* expected_class = DecodeClass(class_id, status); 1464 CHECK(expected_class != nullptr); 1465 return expected_class->IsAssignableFrom(event_class); 1466} 1467 1468bool Dbg::MatchField(JDWP::RefTypeId expected_type_id, JDWP::FieldId expected_field_id, 1469 mirror::ArtField* event_field) { 1470 mirror::ArtField* expected_field = FromFieldId(expected_field_id); 1471 if (expected_field != event_field) { 1472 return false; 1473 } 1474 return Dbg::MatchType(event_field->GetDeclaringClass(), expected_type_id); 1475} 1476 1477bool Dbg::MatchInstance(JDWP::ObjectId expected_instance_id, mirror::Object* event_instance) { 1478 mirror::Object* modifier_instance = gRegistry->Get<mirror::Object*>(expected_instance_id); 1479 return modifier_instance == event_instance; 1480} 1481 1482void Dbg::SetJdwpLocation(JDWP::JdwpLocation* location, mirror::ArtMethod* m, uint32_t dex_pc) 1483 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1484 if (m == nullptr) { 1485 memset(location, 0, sizeof(*location)); 1486 } else { 1487 mirror::Class* c = m->GetDeclaringClass(); 1488 location->type_tag = GetTypeTag(c); 1489 location->class_id = gRegistry->AddRefType(c); 1490 location->method_id = ToMethodId(m); 1491 location->dex_pc = (m->IsNative() || m->IsProxyMethod()) ? static_cast<uint64_t>(-1) : dex_pc; 1492 } 1493} 1494 1495std::string Dbg::GetMethodName(JDWP::MethodId method_id) 1496 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1497 mirror::ArtMethod* m = FromMethodId(method_id); 1498 if (m == nullptr) { 1499 return "NULL"; 1500 } 1501 return m->GetName(); 1502} 1503 1504std::string Dbg::GetFieldName(JDWP::FieldId field_id) 1505 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1506 mirror::ArtField* f = FromFieldId(field_id); 1507 if (f == nullptr) { 1508 return "NULL"; 1509 } 1510 return f->GetName(); 1511} 1512 1513/* 1514 * Augment the access flags for synthetic methods and fields by setting 1515 * the (as described by the spec) "0xf0000000 bit". Also, strip out any 1516 * flags not specified by the Java programming language. 1517 */ 1518static uint32_t MangleAccessFlags(uint32_t accessFlags) { 1519 accessFlags &= kAccJavaFlagsMask; 1520 if ((accessFlags & kAccSynthetic) != 0) { 1521 accessFlags |= 0xf0000000; 1522 } 1523 return accessFlags; 1524} 1525 1526/* 1527 * Circularly shifts registers so that arguments come first. Debuggers 1528 * expect slots to begin with arguments, but dex code places them at 1529 * the end. 1530 */ 1531static uint16_t MangleSlot(uint16_t slot, mirror::ArtMethod* m) 1532 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1533 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1534 if (code_item == nullptr) { 1535 // We should not get here for a method without code (native, proxy or abstract). Log it and 1536 // return the slot as is since all registers are arguments. 1537 LOG(WARNING) << "Trying to mangle slot for method without code " << PrettyMethod(m); 1538 return slot; 1539 } 1540 uint16_t ins_size = code_item->ins_size_; 1541 uint16_t locals_size = code_item->registers_size_ - ins_size; 1542 if (slot >= locals_size) { 1543 return slot - locals_size; 1544 } else { 1545 return slot + ins_size; 1546 } 1547} 1548 1549/* 1550 * Circularly shifts registers so that arguments come last. Reverts 1551 * slots to dex style argument placement. 1552 */ 1553static uint16_t DemangleSlot(uint16_t slot, mirror::ArtMethod* m) 1554 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1555 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1556 if (code_item == nullptr) { 1557 // We should not get here for a method without code (native, proxy or abstract). Log it and 1558 // return the slot as is since all registers are arguments. 1559 LOG(WARNING) << "Trying to demangle slot for method without code " << PrettyMethod(m); 1560 return slot; 1561 } 1562 uint16_t ins_size = code_item->ins_size_; 1563 uint16_t locals_size = code_item->registers_size_ - ins_size; 1564 if (slot < ins_size) { 1565 return slot + locals_size; 1566 } else { 1567 return slot - ins_size; 1568 } 1569} 1570 1571JDWP::JdwpError Dbg::OutputDeclaredFields(JDWP::RefTypeId class_id, bool with_generic, JDWP::ExpandBuf* pReply) { 1572 JDWP::JdwpError status; 1573 mirror::Class* c = DecodeClass(class_id, status); 1574 if (c == NULL) { 1575 return status; 1576 } 1577 1578 size_t instance_field_count = c->NumInstanceFields(); 1579 size_t static_field_count = c->NumStaticFields(); 1580 1581 expandBufAdd4BE(pReply, instance_field_count + static_field_count); 1582 1583 for (size_t i = 0; i < instance_field_count + static_field_count; ++i) { 1584 mirror::ArtField* f = (i < instance_field_count) ? c->GetInstanceField(i) : c->GetStaticField(i - instance_field_count); 1585 expandBufAddFieldId(pReply, ToFieldId(f)); 1586 expandBufAddUtf8String(pReply, f->GetName()); 1587 expandBufAddUtf8String(pReply, f->GetTypeDescriptor()); 1588 if (with_generic) { 1589 static const char genericSignature[1] = ""; 1590 expandBufAddUtf8String(pReply, genericSignature); 1591 } 1592 expandBufAdd4BE(pReply, MangleAccessFlags(f->GetAccessFlags())); 1593 } 1594 return JDWP::ERR_NONE; 1595} 1596 1597JDWP::JdwpError Dbg::OutputDeclaredMethods(JDWP::RefTypeId class_id, bool with_generic, 1598 JDWP::ExpandBuf* pReply) { 1599 JDWP::JdwpError status; 1600 mirror::Class* c = DecodeClass(class_id, status); 1601 if (c == NULL) { 1602 return status; 1603 } 1604 1605 size_t direct_method_count = c->NumDirectMethods(); 1606 size_t virtual_method_count = c->NumVirtualMethods(); 1607 1608 expandBufAdd4BE(pReply, direct_method_count + virtual_method_count); 1609 1610 for (size_t i = 0; i < direct_method_count + virtual_method_count; ++i) { 1611 mirror::ArtMethod* m = (i < direct_method_count) ? c->GetDirectMethod(i) : c->GetVirtualMethod(i - direct_method_count); 1612 expandBufAddMethodId(pReply, ToMethodId(m)); 1613 expandBufAddUtf8String(pReply, m->GetName()); 1614 expandBufAddUtf8String(pReply, m->GetSignature().ToString()); 1615 if (with_generic) { 1616 static const char genericSignature[1] = ""; 1617 expandBufAddUtf8String(pReply, genericSignature); 1618 } 1619 expandBufAdd4BE(pReply, MangleAccessFlags(m->GetAccessFlags())); 1620 } 1621 return JDWP::ERR_NONE; 1622} 1623 1624JDWP::JdwpError Dbg::OutputDeclaredInterfaces(JDWP::RefTypeId class_id, JDWP::ExpandBuf* pReply) { 1625 JDWP::JdwpError status; 1626 Thread* self = Thread::Current(); 1627 StackHandleScope<1> hs(self); 1628 Handle<mirror::Class> c(hs.NewHandle(DecodeClass(class_id, status))); 1629 if (c.Get() == nullptr) { 1630 return status; 1631 } 1632 size_t interface_count = c->NumDirectInterfaces(); 1633 expandBufAdd4BE(pReply, interface_count); 1634 for (size_t i = 0; i < interface_count; ++i) { 1635 expandBufAddRefTypeId(pReply, 1636 gRegistry->AddRefType(mirror::Class::GetDirectInterface(self, c, i))); 1637 } 1638 return JDWP::ERR_NONE; 1639} 1640 1641void Dbg::OutputLineTable(JDWP::RefTypeId, JDWP::MethodId method_id, JDWP::ExpandBuf* pReply) 1642 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1643 struct DebugCallbackContext { 1644 int numItems; 1645 JDWP::ExpandBuf* pReply; 1646 1647 static bool Callback(void* context, uint32_t address, uint32_t line_number) { 1648 DebugCallbackContext* pContext = reinterpret_cast<DebugCallbackContext*>(context); 1649 expandBufAdd8BE(pContext->pReply, address); 1650 expandBufAdd4BE(pContext->pReply, line_number); 1651 pContext->numItems++; 1652 return false; 1653 } 1654 }; 1655 mirror::ArtMethod* m = FromMethodId(method_id); 1656 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1657 uint64_t start, end; 1658 if (code_item == nullptr) { 1659 DCHECK(m->IsNative() || m->IsProxyMethod()); 1660 start = -1; 1661 end = -1; 1662 } else { 1663 start = 0; 1664 // Return the index of the last instruction 1665 end = code_item->insns_size_in_code_units_ - 1; 1666 } 1667 1668 expandBufAdd8BE(pReply, start); 1669 expandBufAdd8BE(pReply, end); 1670 1671 // Add numLines later 1672 size_t numLinesOffset = expandBufGetLength(pReply); 1673 expandBufAdd4BE(pReply, 0); 1674 1675 DebugCallbackContext context; 1676 context.numItems = 0; 1677 context.pReply = pReply; 1678 1679 if (code_item != nullptr) { 1680 m->GetDexFile()->DecodeDebugInfo(code_item, m->IsStatic(), m->GetDexMethodIndex(), 1681 DebugCallbackContext::Callback, NULL, &context); 1682 } 1683 1684 JDWP::Set4BE(expandBufGetBuffer(pReply) + numLinesOffset, context.numItems); 1685} 1686 1687void Dbg::OutputVariableTable(JDWP::RefTypeId, JDWP::MethodId method_id, bool with_generic, 1688 JDWP::ExpandBuf* pReply) { 1689 struct DebugCallbackContext { 1690 mirror::ArtMethod* method; 1691 JDWP::ExpandBuf* pReply; 1692 size_t variable_count; 1693 bool with_generic; 1694 1695 static void Callback(void* context, uint16_t slot, uint32_t startAddress, uint32_t endAddress, 1696 const char* name, const char* descriptor, const char* signature) 1697 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1698 DebugCallbackContext* pContext = reinterpret_cast<DebugCallbackContext*>(context); 1699 1700 VLOG(jdwp) << StringPrintf(" %2zd: %d(%d) '%s' '%s' '%s' actual slot=%d mangled slot=%d", 1701 pContext->variable_count, startAddress, endAddress - startAddress, 1702 name, descriptor, signature, slot, 1703 MangleSlot(slot, pContext->method)); 1704 1705 slot = MangleSlot(slot, pContext->method); 1706 1707 expandBufAdd8BE(pContext->pReply, startAddress); 1708 expandBufAddUtf8String(pContext->pReply, name); 1709 expandBufAddUtf8String(pContext->pReply, descriptor); 1710 if (pContext->with_generic) { 1711 expandBufAddUtf8String(pContext->pReply, signature); 1712 } 1713 expandBufAdd4BE(pContext->pReply, endAddress - startAddress); 1714 expandBufAdd4BE(pContext->pReply, slot); 1715 1716 ++pContext->variable_count; 1717 } 1718 }; 1719 mirror::ArtMethod* m = FromMethodId(method_id); 1720 1721 // arg_count considers doubles and longs to take 2 units. 1722 // variable_count considers everything to take 1 unit. 1723 std::string shorty(m->GetShorty()); 1724 expandBufAdd4BE(pReply, mirror::ArtMethod::NumArgRegisters(shorty)); 1725 1726 // We don't know the total number of variables yet, so leave a blank and update it later. 1727 size_t variable_count_offset = expandBufGetLength(pReply); 1728 expandBufAdd4BE(pReply, 0); 1729 1730 DebugCallbackContext context; 1731 context.method = m; 1732 context.pReply = pReply; 1733 context.variable_count = 0; 1734 context.with_generic = with_generic; 1735 1736 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1737 if (code_item != nullptr) { 1738 m->GetDexFile()->DecodeDebugInfo( 1739 code_item, m->IsStatic(), m->GetDexMethodIndex(), NULL, DebugCallbackContext::Callback, 1740 &context); 1741 } 1742 1743 JDWP::Set4BE(expandBufGetBuffer(pReply) + variable_count_offset, context.variable_count); 1744} 1745 1746void Dbg::OutputMethodReturnValue(JDWP::MethodId method_id, const JValue* return_value, 1747 JDWP::ExpandBuf* pReply) { 1748 mirror::ArtMethod* m = FromMethodId(method_id); 1749 JDWP::JdwpTag tag = BasicTagFromDescriptor(m->GetShorty()); 1750 OutputJValue(tag, return_value, pReply); 1751} 1752 1753void Dbg::OutputFieldValue(JDWP::FieldId field_id, const JValue* field_value, 1754 JDWP::ExpandBuf* pReply) { 1755 mirror::ArtField* f = FromFieldId(field_id); 1756 JDWP::JdwpTag tag = BasicTagFromDescriptor(f->GetTypeDescriptor()); 1757 OutputJValue(tag, field_value, pReply); 1758} 1759 1760JDWP::JdwpError Dbg::GetBytecodes(JDWP::RefTypeId, JDWP::MethodId method_id, 1761 std::vector<uint8_t>& bytecodes) 1762 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1763 mirror::ArtMethod* m = FromMethodId(method_id); 1764 if (m == NULL) { 1765 return JDWP::ERR_INVALID_METHODID; 1766 } 1767 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1768 size_t byte_count = code_item->insns_size_in_code_units_ * 2; 1769 const uint8_t* begin = reinterpret_cast<const uint8_t*>(code_item->insns_); 1770 const uint8_t* end = begin + byte_count; 1771 for (const uint8_t* p = begin; p != end; ++p) { 1772 bytecodes.push_back(*p); 1773 } 1774 return JDWP::ERR_NONE; 1775} 1776 1777JDWP::JdwpTag Dbg::GetFieldBasicTag(JDWP::FieldId field_id) { 1778 return BasicTagFromDescriptor(FromFieldId(field_id)->GetTypeDescriptor()); 1779} 1780 1781JDWP::JdwpTag Dbg::GetStaticFieldBasicTag(JDWP::FieldId field_id) { 1782 return BasicTagFromDescriptor(FromFieldId(field_id)->GetTypeDescriptor()); 1783} 1784 1785static JDWP::JdwpError GetFieldValueImpl(JDWP::RefTypeId ref_type_id, JDWP::ObjectId object_id, 1786 JDWP::FieldId field_id, JDWP::ExpandBuf* pReply, 1787 bool is_static) 1788 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1789 JDWP::JdwpError status; 1790 mirror::Class* c = DecodeClass(ref_type_id, status); 1791 if (ref_type_id != 0 && c == NULL) { 1792 return status; 1793 } 1794 1795 mirror::Object* o = Dbg::GetObjectRegistry()->Get<mirror::Object*>(object_id); 1796 if ((!is_static && o == NULL) || o == ObjectRegistry::kInvalidObject) { 1797 return JDWP::ERR_INVALID_OBJECT; 1798 } 1799 mirror::ArtField* f = FromFieldId(field_id); 1800 1801 mirror::Class* receiver_class = c; 1802 if (receiver_class == NULL && o != NULL) { 1803 receiver_class = o->GetClass(); 1804 } 1805 // TODO: should we give up now if receiver_class is NULL? 1806 if (receiver_class != NULL && !f->GetDeclaringClass()->IsAssignableFrom(receiver_class)) { 1807 LOG(INFO) << "ERR_INVALID_FIELDID: " << PrettyField(f) << " " << PrettyClass(receiver_class); 1808 return JDWP::ERR_INVALID_FIELDID; 1809 } 1810 1811 // The RI only enforces the static/non-static mismatch in one direction. 1812 // TODO: should we change the tests and check both? 1813 if (is_static) { 1814 if (!f->IsStatic()) { 1815 return JDWP::ERR_INVALID_FIELDID; 1816 } 1817 } else { 1818 if (f->IsStatic()) { 1819 LOG(WARNING) << "Ignoring non-NULL receiver for ObjectReference.SetValues on static field " << PrettyField(f); 1820 } 1821 } 1822 if (f->IsStatic()) { 1823 o = f->GetDeclaringClass(); 1824 } 1825 1826 JDWP::JdwpTag tag = BasicTagFromDescriptor(f->GetTypeDescriptor()); 1827 JValue field_value; 1828 if (tag == JDWP::JT_VOID) { 1829 LOG(FATAL) << "Unknown tag: " << tag; 1830 } else if (!IsPrimitiveTag(tag)) { 1831 field_value.SetL(f->GetObject(o)); 1832 } else if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) { 1833 field_value.SetJ(f->Get64(o)); 1834 } else { 1835 field_value.SetI(f->Get32(o)); 1836 } 1837 Dbg::OutputJValue(tag, &field_value, pReply); 1838 1839 return JDWP::ERR_NONE; 1840} 1841 1842JDWP::JdwpError Dbg::GetFieldValue(JDWP::ObjectId object_id, JDWP::FieldId field_id, 1843 JDWP::ExpandBuf* pReply) { 1844 return GetFieldValueImpl(0, object_id, field_id, pReply, false); 1845} 1846 1847JDWP::JdwpError Dbg::GetStaticFieldValue(JDWP::RefTypeId ref_type_id, JDWP::FieldId field_id, JDWP::ExpandBuf* pReply) { 1848 return GetFieldValueImpl(ref_type_id, 0, field_id, pReply, true); 1849} 1850 1851static JDWP::JdwpError SetFieldValueImpl(JDWP::ObjectId object_id, JDWP::FieldId field_id, 1852 uint64_t value, int width, bool is_static) 1853 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1854 mirror::Object* o = Dbg::GetObjectRegistry()->Get<mirror::Object*>(object_id); 1855 if ((!is_static && o == NULL) || o == ObjectRegistry::kInvalidObject) { 1856 return JDWP::ERR_INVALID_OBJECT; 1857 } 1858 mirror::ArtField* f = FromFieldId(field_id); 1859 1860 // The RI only enforces the static/non-static mismatch in one direction. 1861 // TODO: should we change the tests and check both? 1862 if (is_static) { 1863 if (!f->IsStatic()) { 1864 return JDWP::ERR_INVALID_FIELDID; 1865 } 1866 } else { 1867 if (f->IsStatic()) { 1868 LOG(WARNING) << "Ignoring non-NULL receiver for ObjectReference.SetValues on static field " << PrettyField(f); 1869 } 1870 } 1871 if (f->IsStatic()) { 1872 o = f->GetDeclaringClass(); 1873 } 1874 1875 JDWP::JdwpTag tag = BasicTagFromDescriptor(f->GetTypeDescriptor()); 1876 1877 if (IsPrimitiveTag(tag)) { 1878 if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) { 1879 CHECK_EQ(width, 8); 1880 // Debugging can't use transactional mode (runtime only). 1881 f->Set64<false>(o, value); 1882 } else { 1883 CHECK_LE(width, 4); 1884 // Debugging can't use transactional mode (runtime only). 1885 f->Set32<false>(o, value); 1886 } 1887 } else { 1888 mirror::Object* v = Dbg::GetObjectRegistry()->Get<mirror::Object*>(value); 1889 if (v == ObjectRegistry::kInvalidObject) { 1890 return JDWP::ERR_INVALID_OBJECT; 1891 } 1892 if (v != NULL) { 1893 mirror::Class* field_type; 1894 { 1895 StackHandleScope<3> hs(Thread::Current()); 1896 HandleWrapper<mirror::Object> h_v(hs.NewHandleWrapper(&v)); 1897 HandleWrapper<mirror::ArtField> h_f(hs.NewHandleWrapper(&f)); 1898 HandleWrapper<mirror::Object> h_o(hs.NewHandleWrapper(&o)); 1899 field_type = FieldHelper(h_f).GetType(); 1900 } 1901 if (!field_type->IsAssignableFrom(v->GetClass())) { 1902 return JDWP::ERR_INVALID_OBJECT; 1903 } 1904 } 1905 // Debugging can't use transactional mode (runtime only). 1906 f->SetObject<false>(o, v); 1907 } 1908 1909 return JDWP::ERR_NONE; 1910} 1911 1912JDWP::JdwpError Dbg::SetFieldValue(JDWP::ObjectId object_id, JDWP::FieldId field_id, uint64_t value, 1913 int width) { 1914 return SetFieldValueImpl(object_id, field_id, value, width, false); 1915} 1916 1917JDWP::JdwpError Dbg::SetStaticFieldValue(JDWP::FieldId field_id, uint64_t value, int width) { 1918 return SetFieldValueImpl(0, field_id, value, width, true); 1919} 1920 1921JDWP::JdwpError Dbg::StringToUtf8(JDWP::ObjectId string_id, std::string* str) { 1922 mirror::Object* obj = gRegistry->Get<mirror::Object*>(string_id); 1923 if (obj == nullptr || obj == ObjectRegistry::kInvalidObject) { 1924 return JDWP::ERR_INVALID_OBJECT; 1925 } 1926 { 1927 ScopedObjectAccessUnchecked soa(Thread::Current()); 1928 mirror::Class* java_lang_String = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_String); 1929 if (!java_lang_String->IsAssignableFrom(obj->GetClass())) { 1930 // This isn't a string. 1931 return JDWP::ERR_INVALID_STRING; 1932 } 1933 } 1934 *str = obj->AsString()->ToModifiedUtf8(); 1935 return JDWP::ERR_NONE; 1936} 1937 1938void Dbg::OutputJValue(JDWP::JdwpTag tag, const JValue* return_value, JDWP::ExpandBuf* pReply) { 1939 if (IsPrimitiveTag(tag)) { 1940 expandBufAdd1(pReply, tag); 1941 if (tag == JDWP::JT_BOOLEAN || tag == JDWP::JT_BYTE) { 1942 expandBufAdd1(pReply, return_value->GetI()); 1943 } else if (tag == JDWP::JT_CHAR || tag == JDWP::JT_SHORT) { 1944 expandBufAdd2BE(pReply, return_value->GetI()); 1945 } else if (tag == JDWP::JT_FLOAT || tag == JDWP::JT_INT) { 1946 expandBufAdd4BE(pReply, return_value->GetI()); 1947 } else if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) { 1948 expandBufAdd8BE(pReply, return_value->GetJ()); 1949 } else { 1950 CHECK_EQ(tag, JDWP::JT_VOID); 1951 } 1952 } else { 1953 ScopedObjectAccessUnchecked soa(Thread::Current()); 1954 mirror::Object* value = return_value->GetL(); 1955 expandBufAdd1(pReply, TagFromObject(soa, value)); 1956 expandBufAddObjectId(pReply, gRegistry->Add(value)); 1957 } 1958} 1959 1960JDWP::JdwpError Dbg::GetThreadName(JDWP::ObjectId thread_id, std::string& name) { 1961 ScopedObjectAccessUnchecked soa(Thread::Current()); 1962 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 1963 Thread* thread; 1964 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 1965 if (error != JDWP::ERR_NONE && error != JDWP::ERR_THREAD_NOT_ALIVE) { 1966 return error; 1967 } 1968 1969 // We still need to report the zombie threads' names, so we can't just call Thread::GetThreadName. 1970 mirror::Object* thread_object = gRegistry->Get<mirror::Object*>(thread_id); 1971 mirror::ArtField* java_lang_Thread_name_field = 1972 soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 1973 mirror::String* s = 1974 reinterpret_cast<mirror::String*>(java_lang_Thread_name_field->GetObject(thread_object)); 1975 if (s != NULL) { 1976 name = s->ToModifiedUtf8(); 1977 } 1978 return JDWP::ERR_NONE; 1979} 1980 1981JDWP::JdwpError Dbg::GetThreadGroup(JDWP::ObjectId thread_id, JDWP::ExpandBuf* pReply) { 1982 ScopedObjectAccess soa(Thread::Current()); 1983 mirror::Object* thread_object = gRegistry->Get<mirror::Object*>(thread_id); 1984 if (thread_object == ObjectRegistry::kInvalidObject) { 1985 return JDWP::ERR_INVALID_OBJECT; 1986 } 1987 const char* old_cause = soa.Self()->StartAssertNoThreadSuspension("Debugger: GetThreadGroup"); 1988 // Okay, so it's an object, but is it actually a thread? 1989 JDWP::JdwpError error; 1990 { 1991 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 1992 Thread* thread; 1993 error = DecodeThread(soa, thread_id, thread); 1994 } 1995 if (error == JDWP::ERR_THREAD_NOT_ALIVE) { 1996 // Zombie threads are in the null group. 1997 expandBufAddObjectId(pReply, JDWP::ObjectId(0)); 1998 error = JDWP::ERR_NONE; 1999 } else if (error == JDWP::ERR_NONE) { 2000 mirror::Class* c = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread); 2001 CHECK(c != nullptr); 2002 mirror::ArtField* f = c->FindInstanceField("group", "Ljava/lang/ThreadGroup;"); 2003 CHECK(f != nullptr); 2004 mirror::Object* group = f->GetObject(thread_object); 2005 CHECK(group != nullptr); 2006 JDWP::ObjectId thread_group_id = gRegistry->Add(group); 2007 expandBufAddObjectId(pReply, thread_group_id); 2008 } 2009 soa.Self()->EndAssertNoThreadSuspension(old_cause); 2010 return error; 2011} 2012 2013std::string Dbg::GetThreadGroupName(JDWP::ObjectId thread_group_id) { 2014 ScopedObjectAccess soa(Thread::Current()); 2015 mirror::Object* thread_group = gRegistry->Get<mirror::Object*>(thread_group_id); 2016 CHECK(thread_group != nullptr); 2017 const char* old_cause = soa.Self()->StartAssertNoThreadSuspension("Debugger: GetThreadGroupName"); 2018 mirror::Class* c = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ThreadGroup); 2019 CHECK(c != nullptr); 2020 mirror::ArtField* f = c->FindInstanceField("name", "Ljava/lang/String;"); 2021 CHECK(f != NULL); 2022 mirror::String* s = reinterpret_cast<mirror::String*>(f->GetObject(thread_group)); 2023 soa.Self()->EndAssertNoThreadSuspension(old_cause); 2024 return s->ToModifiedUtf8(); 2025} 2026 2027JDWP::ObjectId Dbg::GetThreadGroupParent(JDWP::ObjectId thread_group_id) { 2028 ScopedObjectAccessUnchecked soa(Thread::Current()); 2029 mirror::Object* thread_group = gRegistry->Get<mirror::Object*>(thread_group_id); 2030 CHECK(thread_group != nullptr); 2031 const char* old_cause = soa.Self()->StartAssertNoThreadSuspension("Debugger: GetThreadGroupParent"); 2032 mirror::Class* c = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ThreadGroup); 2033 CHECK(c != nullptr); 2034 mirror::ArtField* f = c->FindInstanceField("parent", "Ljava/lang/ThreadGroup;"); 2035 CHECK(f != NULL); 2036 mirror::Object* parent = f->GetObject(thread_group); 2037 soa.Self()->EndAssertNoThreadSuspension(old_cause); 2038 return gRegistry->Add(parent); 2039} 2040 2041JDWP::ObjectId Dbg::GetSystemThreadGroupId() { 2042 ScopedObjectAccessUnchecked soa(Thread::Current()); 2043 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_systemThreadGroup); 2044 mirror::Object* group = f->GetObject(f->GetDeclaringClass()); 2045 return gRegistry->Add(group); 2046} 2047 2048JDWP::ObjectId Dbg::GetMainThreadGroupId() { 2049 ScopedObjectAccess soa(Thread::Current()); 2050 mirror::ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_mainThreadGroup); 2051 mirror::Object* group = f->GetObject(f->GetDeclaringClass()); 2052 return gRegistry->Add(group); 2053} 2054 2055JDWP::JdwpThreadStatus Dbg::ToJdwpThreadStatus(ThreadState state) { 2056 switch (state) { 2057 case kBlocked: 2058 return JDWP::TS_MONITOR; 2059 case kNative: 2060 case kRunnable: 2061 case kSuspended: 2062 return JDWP::TS_RUNNING; 2063 case kSleeping: 2064 return JDWP::TS_SLEEPING; 2065 case kStarting: 2066 case kTerminated: 2067 return JDWP::TS_ZOMBIE; 2068 case kTimedWaiting: 2069 case kWaitingForCheckPointsToRun: 2070 case kWaitingForDebuggerSend: 2071 case kWaitingForDebuggerSuspension: 2072 case kWaitingForDebuggerToAttach: 2073 case kWaitingForDeoptimization: 2074 case kWaitingForGcToComplete: 2075 case kWaitingForJniOnLoad: 2076 case kWaitingForMethodTracingStart: 2077 case kWaitingForSignalCatcherOutput: 2078 case kWaitingInMainDebuggerLoop: 2079 case kWaitingInMainSignalCatcherLoop: 2080 case kWaitingPerformingGc: 2081 case kWaiting: 2082 return JDWP::TS_WAIT; 2083 // Don't add a 'default' here so the compiler can spot incompatible enum changes. 2084 } 2085 LOG(FATAL) << "Unknown thread state: " << state; 2086 return JDWP::TS_ZOMBIE; 2087} 2088 2089JDWP::JdwpError Dbg::GetThreadStatus(JDWP::ObjectId thread_id, JDWP::JdwpThreadStatus* pThreadStatus, 2090 JDWP::JdwpSuspendStatus* pSuspendStatus) { 2091 ScopedObjectAccess soa(Thread::Current()); 2092 2093 *pSuspendStatus = JDWP::SUSPEND_STATUS_NOT_SUSPENDED; 2094 2095 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2096 Thread* thread; 2097 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 2098 if (error != JDWP::ERR_NONE) { 2099 if (error == JDWP::ERR_THREAD_NOT_ALIVE) { 2100 *pThreadStatus = JDWP::TS_ZOMBIE; 2101 return JDWP::ERR_NONE; 2102 } 2103 return error; 2104 } 2105 2106 if (IsSuspendedForDebugger(soa, thread)) { 2107 *pSuspendStatus = JDWP::SUSPEND_STATUS_SUSPENDED; 2108 } 2109 2110 *pThreadStatus = ToJdwpThreadStatus(thread->GetState()); 2111 return JDWP::ERR_NONE; 2112} 2113 2114JDWP::JdwpError Dbg::GetThreadDebugSuspendCount(JDWP::ObjectId thread_id, JDWP::ExpandBuf* pReply) { 2115 ScopedObjectAccess soa(Thread::Current()); 2116 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2117 Thread* thread; 2118 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 2119 if (error != JDWP::ERR_NONE) { 2120 return error; 2121 } 2122 MutexLock mu2(soa.Self(), *Locks::thread_suspend_count_lock_); 2123 expandBufAdd4BE(pReply, thread->GetDebugSuspendCount()); 2124 return JDWP::ERR_NONE; 2125} 2126 2127JDWP::JdwpError Dbg::Interrupt(JDWP::ObjectId thread_id) { 2128 ScopedObjectAccess soa(Thread::Current()); 2129 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2130 Thread* thread; 2131 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 2132 if (error != JDWP::ERR_NONE) { 2133 return error; 2134 } 2135 thread->Interrupt(soa.Self()); 2136 return JDWP::ERR_NONE; 2137} 2138 2139static bool IsInDesiredThreadGroup(ScopedObjectAccessUnchecked& soa, 2140 mirror::Object* desired_thread_group, mirror::Object* peer) 2141 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2142 // Do we want threads from all thread groups? 2143 if (desired_thread_group == nullptr) { 2144 return true; 2145 } 2146 mirror::ArtField* thread_group_field = soa.DecodeField(WellKnownClasses::java_lang_Thread_group); 2147 DCHECK(thread_group_field != nullptr); 2148 mirror::Object* group = thread_group_field->GetObject(peer); 2149 return (group == desired_thread_group); 2150} 2151 2152void Dbg::GetThreads(JDWP::ObjectId thread_group_id, std::vector<JDWP::ObjectId>& thread_ids) { 2153 ScopedObjectAccessUnchecked soa(Thread::Current()); 2154 mirror::Object* thread_group = gRegistry->Get<mirror::Object*>(thread_group_id); 2155 std::list<Thread*> all_threads_list; 2156 { 2157 MutexLock mu(Thread::Current(), *Locks::thread_list_lock_); 2158 all_threads_list = Runtime::Current()->GetThreadList()->GetList(); 2159 } 2160 for (Thread* t : all_threads_list) { 2161 if (t == Dbg::GetDebugThread()) { 2162 // Skip the JDWP thread. Some debuggers get bent out of shape when they can't suspend and 2163 // query all threads, so it's easier if we just don't tell them about this thread. 2164 continue; 2165 } 2166 if (t->IsStillStarting()) { 2167 // This thread is being started (and has been registered in the thread list). However, it is 2168 // not completely started yet so we must ignore it. 2169 continue; 2170 } 2171 mirror::Object* peer = t->GetPeer(); 2172 if (peer == nullptr) { 2173 // peer might be NULL if the thread is still starting up. We can't tell the debugger about 2174 // this thread yet. 2175 // TODO: if we identified threads to the debugger by their Thread* 2176 // rather than their peer's mirror::Object*, we could fix this. 2177 // Doing so might help us report ZOMBIE threads too. 2178 continue; 2179 } 2180 if (IsInDesiredThreadGroup(soa, thread_group, peer)) { 2181 thread_ids.push_back(gRegistry->Add(peer)); 2182 } 2183 } 2184} 2185 2186void Dbg::GetChildThreadGroups(JDWP::ObjectId thread_group_id, std::vector<JDWP::ObjectId>& child_thread_group_ids) { 2187 ScopedObjectAccess soa(Thread::Current()); 2188 mirror::Object* thread_group = gRegistry->Get<mirror::Object*>(thread_group_id); 2189 2190 // Get the ArrayList<ThreadGroup> "groups" out of this thread group... 2191 mirror::ArtField* groups_field = thread_group->GetClass()->FindInstanceField("groups", "Ljava/util/List;"); 2192 mirror::Object* groups_array_list = groups_field->GetObject(thread_group); 2193 2194 // Get the array and size out of the ArrayList<ThreadGroup>... 2195 mirror::ArtField* array_field = groups_array_list->GetClass()->FindInstanceField("array", "[Ljava/lang/Object;"); 2196 mirror::ArtField* size_field = groups_array_list->GetClass()->FindInstanceField("size", "I"); 2197 mirror::ObjectArray<mirror::Object>* groups_array = 2198 array_field->GetObject(groups_array_list)->AsObjectArray<mirror::Object>(); 2199 const int32_t size = size_field->GetInt(groups_array_list); 2200 2201 // Copy the first 'size' elements out of the array into the result. 2202 for (int32_t i = 0; i < size; ++i) { 2203 child_thread_group_ids.push_back(gRegistry->Add(groups_array->Get(i))); 2204 } 2205} 2206 2207static int GetStackDepth(Thread* thread) 2208 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2209 struct CountStackDepthVisitor : public StackVisitor { 2210 explicit CountStackDepthVisitor(Thread* thread) 2211 : StackVisitor(thread, NULL), depth(0) {} 2212 2213 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 2214 // annotalysis. 2215 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 2216 if (!GetMethod()->IsRuntimeMethod()) { 2217 ++depth; 2218 } 2219 return true; 2220 } 2221 size_t depth; 2222 }; 2223 2224 CountStackDepthVisitor visitor(thread); 2225 visitor.WalkStack(); 2226 return visitor.depth; 2227} 2228 2229JDWP::JdwpError Dbg::GetThreadFrameCount(JDWP::ObjectId thread_id, size_t& result) { 2230 ScopedObjectAccess soa(Thread::Current()); 2231 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2232 Thread* thread; 2233 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 2234 if (error != JDWP::ERR_NONE) { 2235 return error; 2236 } 2237 if (!IsSuspendedForDebugger(soa, thread)) { 2238 return JDWP::ERR_THREAD_NOT_SUSPENDED; 2239 } 2240 result = GetStackDepth(thread); 2241 return JDWP::ERR_NONE; 2242} 2243 2244JDWP::JdwpError Dbg::GetThreadFrames(JDWP::ObjectId thread_id, size_t start_frame, 2245 size_t frame_count, JDWP::ExpandBuf* buf) { 2246 class GetFrameVisitor : public StackVisitor { 2247 public: 2248 GetFrameVisitor(Thread* thread, size_t start_frame, size_t frame_count, JDWP::ExpandBuf* buf) 2249 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2250 : StackVisitor(thread, NULL), depth_(0), 2251 start_frame_(start_frame), frame_count_(frame_count), buf_(buf) { 2252 expandBufAdd4BE(buf_, frame_count_); 2253 } 2254 2255 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 2256 // annotalysis. 2257 virtual bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 2258 if (GetMethod()->IsRuntimeMethod()) { 2259 return true; // The debugger can't do anything useful with a frame that has no Method*. 2260 } 2261 if (depth_ >= start_frame_ + frame_count_) { 2262 return false; 2263 } 2264 if (depth_ >= start_frame_) { 2265 JDWP::FrameId frame_id(GetFrameId()); 2266 JDWP::JdwpLocation location; 2267 SetJdwpLocation(&location, GetMethod(), GetDexPc()); 2268 VLOG(jdwp) << StringPrintf(" Frame %3zd: id=%3" PRIu64 " ", depth_, frame_id) << location; 2269 expandBufAdd8BE(buf_, frame_id); 2270 expandBufAddLocation(buf_, location); 2271 } 2272 ++depth_; 2273 return true; 2274 } 2275 2276 private: 2277 size_t depth_; 2278 const size_t start_frame_; 2279 const size_t frame_count_; 2280 JDWP::ExpandBuf* buf_; 2281 }; 2282 2283 ScopedObjectAccessUnchecked soa(Thread::Current()); 2284 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2285 Thread* thread; 2286 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 2287 if (error != JDWP::ERR_NONE) { 2288 return error; 2289 } 2290 if (!IsSuspendedForDebugger(soa, thread)) { 2291 return JDWP::ERR_THREAD_NOT_SUSPENDED; 2292 } 2293 GetFrameVisitor visitor(thread, start_frame, frame_count, buf); 2294 visitor.WalkStack(); 2295 return JDWP::ERR_NONE; 2296} 2297 2298JDWP::ObjectId Dbg::GetThreadSelfId() { 2299 return GetThreadId(Thread::Current()); 2300} 2301 2302JDWP::ObjectId Dbg::GetThreadId(Thread* thread) { 2303 ScopedObjectAccessUnchecked soa(Thread::Current()); 2304 return gRegistry->Add(thread->GetPeer()); 2305} 2306 2307void Dbg::SuspendVM() { 2308 Runtime::Current()->GetThreadList()->SuspendAllForDebugger(); 2309} 2310 2311void Dbg::ResumeVM() { 2312 Runtime::Current()->GetThreadList()->UndoDebuggerSuspensions(); 2313} 2314 2315JDWP::JdwpError Dbg::SuspendThread(JDWP::ObjectId thread_id, bool request_suspension) { 2316 Thread* self = Thread::Current(); 2317 ScopedLocalRef<jobject> peer(self->GetJniEnv(), NULL); 2318 { 2319 ScopedObjectAccess soa(self); 2320 peer.reset(soa.AddLocalReference<jobject>(gRegistry->Get<mirror::Object*>(thread_id))); 2321 } 2322 if (peer.get() == NULL) { 2323 return JDWP::ERR_THREAD_NOT_ALIVE; 2324 } 2325 // Suspend thread to build stack trace. Take suspend thread lock to avoid races with threads 2326 // trying to suspend this one. 2327 MutexLock mu(self, *Locks::thread_list_suspend_thread_lock_); 2328 bool timed_out; 2329 ThreadList* thread_list = Runtime::Current()->GetThreadList(); 2330 Thread* thread = thread_list->SuspendThreadByPeer(peer.get(), request_suspension, true, 2331 &timed_out); 2332 if (thread != NULL) { 2333 return JDWP::ERR_NONE; 2334 } else if (timed_out) { 2335 return JDWP::ERR_INTERNAL; 2336 } else { 2337 return JDWP::ERR_THREAD_NOT_ALIVE; 2338 } 2339} 2340 2341void Dbg::ResumeThread(JDWP::ObjectId thread_id) { 2342 ScopedObjectAccessUnchecked soa(Thread::Current()); 2343 mirror::Object* peer = gRegistry->Get<mirror::Object*>(thread_id); 2344 Thread* thread; 2345 { 2346 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2347 thread = Thread::FromManagedThread(soa, peer); 2348 } 2349 if (thread == NULL) { 2350 LOG(WARNING) << "No such thread for resume: " << peer; 2351 return; 2352 } 2353 bool needs_resume; 2354 { 2355 MutexLock mu2(soa.Self(), *Locks::thread_suspend_count_lock_); 2356 needs_resume = thread->GetSuspendCount() > 0; 2357 } 2358 if (needs_resume) { 2359 Runtime::Current()->GetThreadList()->Resume(thread, true); 2360 } 2361} 2362 2363void Dbg::SuspendSelf() { 2364 Runtime::Current()->GetThreadList()->SuspendSelfForDebugger(); 2365} 2366 2367struct GetThisVisitor : public StackVisitor { 2368 GetThisVisitor(Thread* thread, Context* context, JDWP::FrameId frame_id) 2369 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2370 : StackVisitor(thread, context), this_object(NULL), frame_id(frame_id) {} 2371 2372 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 2373 // annotalysis. 2374 virtual bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 2375 if (frame_id != GetFrameId()) { 2376 return true; // continue 2377 } else { 2378 this_object = GetThisObject(); 2379 return false; 2380 } 2381 } 2382 2383 mirror::Object* this_object; 2384 JDWP::FrameId frame_id; 2385}; 2386 2387JDWP::JdwpError Dbg::GetThisObject(JDWP::ObjectId thread_id, JDWP::FrameId frame_id, 2388 JDWP::ObjectId* result) { 2389 ScopedObjectAccessUnchecked soa(Thread::Current()); 2390 Thread* thread; 2391 { 2392 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2393 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 2394 if (error != JDWP::ERR_NONE) { 2395 return error; 2396 } 2397 if (!IsSuspendedForDebugger(soa, thread)) { 2398 return JDWP::ERR_THREAD_NOT_SUSPENDED; 2399 } 2400 } 2401 std::unique_ptr<Context> context(Context::Create()); 2402 GetThisVisitor visitor(thread, context.get(), frame_id); 2403 visitor.WalkStack(); 2404 *result = gRegistry->Add(visitor.this_object); 2405 return JDWP::ERR_NONE; 2406} 2407 2408JDWP::JdwpError Dbg::GetLocalValue(JDWP::ObjectId thread_id, JDWP::FrameId frame_id, int slot, 2409 JDWP::JdwpTag tag, uint8_t* buf, size_t width) { 2410 struct GetLocalVisitor : public StackVisitor { 2411 GetLocalVisitor(const ScopedObjectAccessUnchecked& soa, Thread* thread, Context* context, 2412 JDWP::FrameId frame_id, int slot, JDWP::JdwpTag tag, uint8_t* buf, size_t width) 2413 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2414 : StackVisitor(thread, context), soa_(soa), frame_id_(frame_id), slot_(slot), tag_(tag), 2415 buf_(buf), width_(width), error_(JDWP::ERR_NONE) {} 2416 2417 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 2418 // annotalysis. 2419 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 2420 if (GetFrameId() != frame_id_) { 2421 return true; // Not our frame, carry on. 2422 } 2423 // TODO: check that the tag is compatible with the actual type of the slot! 2424 // TODO: check slot is valid for this method or return INVALID_SLOT error. 2425 mirror::ArtMethod* m = GetMethod(); 2426 if (m->IsNative()) { 2427 // We can't read local value from native method. 2428 error_ = JDWP::ERR_OPAQUE_FRAME; 2429 return false; 2430 } 2431 uint16_t reg = DemangleSlot(slot_, m); 2432 constexpr JDWP::JdwpError kFailureErrorCode = JDWP::ERR_ABSENT_INFORMATION; 2433 switch (tag_) { 2434 case JDWP::JT_BOOLEAN: { 2435 CHECK_EQ(width_, 1U); 2436 uint32_t intVal; 2437 if (GetVReg(m, reg, kIntVReg, &intVal)) { 2438 VLOG(jdwp) << "get boolean local " << reg << " = " << intVal; 2439 JDWP::Set1(buf_+1, intVal != 0); 2440 } else { 2441 VLOG(jdwp) << "failed to get boolean local " << reg; 2442 error_ = kFailureErrorCode; 2443 } 2444 break; 2445 } 2446 case JDWP::JT_BYTE: { 2447 CHECK_EQ(width_, 1U); 2448 uint32_t intVal; 2449 if (GetVReg(m, reg, kIntVReg, &intVal)) { 2450 VLOG(jdwp) << "get byte local " << reg << " = " << intVal; 2451 JDWP::Set1(buf_+1, intVal); 2452 } else { 2453 VLOG(jdwp) << "failed to get byte local " << reg; 2454 error_ = kFailureErrorCode; 2455 } 2456 break; 2457 } 2458 case JDWP::JT_SHORT: 2459 case JDWP::JT_CHAR: { 2460 CHECK_EQ(width_, 2U); 2461 uint32_t intVal; 2462 if (GetVReg(m, reg, kIntVReg, &intVal)) { 2463 VLOG(jdwp) << "get short/char local " << reg << " = " << intVal; 2464 JDWP::Set2BE(buf_+1, intVal); 2465 } else { 2466 VLOG(jdwp) << "failed to get short/char local " << reg; 2467 error_ = kFailureErrorCode; 2468 } 2469 break; 2470 } 2471 case JDWP::JT_INT: { 2472 CHECK_EQ(width_, 4U); 2473 uint32_t intVal; 2474 if (GetVReg(m, reg, kIntVReg, &intVal)) { 2475 VLOG(jdwp) << "get int local " << reg << " = " << intVal; 2476 JDWP::Set4BE(buf_+1, intVal); 2477 } else { 2478 VLOG(jdwp) << "failed to get int local " << reg; 2479 error_ = kFailureErrorCode; 2480 } 2481 break; 2482 } 2483 case JDWP::JT_FLOAT: { 2484 CHECK_EQ(width_, 4U); 2485 uint32_t intVal; 2486 if (GetVReg(m, reg, kFloatVReg, &intVal)) { 2487 VLOG(jdwp) << "get float local " << reg << " = " << intVal; 2488 JDWP::Set4BE(buf_+1, intVal); 2489 } else { 2490 VLOG(jdwp) << "failed to get float local " << reg; 2491 error_ = kFailureErrorCode; 2492 } 2493 break; 2494 } 2495 case JDWP::JT_ARRAY: 2496 case JDWP::JT_CLASS_LOADER: 2497 case JDWP::JT_CLASS_OBJECT: 2498 case JDWP::JT_OBJECT: 2499 case JDWP::JT_STRING: 2500 case JDWP::JT_THREAD: 2501 case JDWP::JT_THREAD_GROUP: { 2502 CHECK_EQ(width_, sizeof(JDWP::ObjectId)); 2503 uint32_t intVal; 2504 if (GetVReg(m, reg, kReferenceVReg, &intVal)) { 2505 mirror::Object* o = reinterpret_cast<mirror::Object*>(intVal); 2506 VLOG(jdwp) << "get " << tag_ << " object local " << reg << " = " << o; 2507 if (!Runtime::Current()->GetHeap()->IsValidObjectAddress(o)) { 2508 LOG(FATAL) << "Register " << reg << " expected to hold " << tag_ << " object: " << o; 2509 } 2510 tag_ = TagFromObject(soa_, o); 2511 JDWP::SetObjectId(buf_+1, gRegistry->Add(o)); 2512 } else { 2513 VLOG(jdwp) << "failed to get " << tag_ << " object local " << reg; 2514 error_ = kFailureErrorCode; 2515 } 2516 break; 2517 } 2518 case JDWP::JT_DOUBLE: { 2519 CHECK_EQ(width_, 8U); 2520 uint64_t longVal; 2521 if (GetVRegPair(m, reg, kDoubleLoVReg, kDoubleHiVReg, &longVal)) { 2522 VLOG(jdwp) << "get double local " << reg << " = " << longVal; 2523 JDWP::Set8BE(buf_+1, longVal); 2524 } else { 2525 VLOG(jdwp) << "failed to get double local " << reg; 2526 error_ = kFailureErrorCode; 2527 } 2528 break; 2529 } 2530 case JDWP::JT_LONG: { 2531 CHECK_EQ(width_, 8U); 2532 uint64_t longVal; 2533 if (GetVRegPair(m, reg, kLongLoVReg, kLongHiVReg, &longVal)) { 2534 VLOG(jdwp) << "get long local " << reg << " = " << longVal; 2535 JDWP::Set8BE(buf_+1, longVal); 2536 } else { 2537 VLOG(jdwp) << "failed to get long local " << reg; 2538 error_ = kFailureErrorCode; 2539 } 2540 break; 2541 } 2542 default: 2543 LOG(FATAL) << "Unknown tag " << tag_; 2544 break; 2545 } 2546 2547 // Prepend tag, which may have been updated. 2548 JDWP::Set1(buf_, tag_); 2549 return false; 2550 } 2551 const ScopedObjectAccessUnchecked& soa_; 2552 const JDWP::FrameId frame_id_; 2553 const int slot_; 2554 JDWP::JdwpTag tag_; 2555 uint8_t* const buf_; 2556 const size_t width_; 2557 JDWP::JdwpError error_; 2558 }; 2559 2560 ScopedObjectAccessUnchecked soa(Thread::Current()); 2561 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2562 Thread* thread; 2563 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 2564 if (error != JDWP::ERR_NONE) { 2565 return error; 2566 } 2567 // TODO check thread is suspended by the debugger ? 2568 std::unique_ptr<Context> context(Context::Create()); 2569 GetLocalVisitor visitor(soa, thread, context.get(), frame_id, slot, tag, buf, width); 2570 visitor.WalkStack(); 2571 return visitor.error_; 2572} 2573 2574JDWP::JdwpError Dbg::SetLocalValue(JDWP::ObjectId thread_id, JDWP::FrameId frame_id, int slot, 2575 JDWP::JdwpTag tag, uint64_t value, size_t width) { 2576 struct SetLocalVisitor : public StackVisitor { 2577 SetLocalVisitor(Thread* thread, Context* context, 2578 JDWP::FrameId frame_id, int slot, JDWP::JdwpTag tag, uint64_t value, 2579 size_t width) 2580 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2581 : StackVisitor(thread, context), 2582 frame_id_(frame_id), slot_(slot), tag_(tag), value_(value), width_(width), 2583 error_(JDWP::ERR_NONE) {} 2584 2585 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 2586 // annotalysis. 2587 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 2588 if (GetFrameId() != frame_id_) { 2589 return true; // Not our frame, carry on. 2590 } 2591 // TODO: check that the tag is compatible with the actual type of the slot! 2592 // TODO: check slot is valid for this method or return INVALID_SLOT error. 2593 mirror::ArtMethod* m = GetMethod(); 2594 if (m->IsNative()) { 2595 // We can't read local value from native method. 2596 error_ = JDWP::ERR_OPAQUE_FRAME; 2597 return false; 2598 } 2599 uint16_t reg = DemangleSlot(slot_, m); 2600 constexpr JDWP::JdwpError kFailureErrorCode = JDWP::ERR_ABSENT_INFORMATION; 2601 switch (tag_) { 2602 case JDWP::JT_BOOLEAN: 2603 case JDWP::JT_BYTE: 2604 CHECK_EQ(width_, 1U); 2605 if (!SetVReg(m, reg, static_cast<uint32_t>(value_), kIntVReg)) { 2606 VLOG(jdwp) << "failed to set boolean/byte local " << reg << " = " 2607 << static_cast<uint32_t>(value_); 2608 error_ = kFailureErrorCode; 2609 } 2610 break; 2611 case JDWP::JT_SHORT: 2612 case JDWP::JT_CHAR: 2613 CHECK_EQ(width_, 2U); 2614 if (!SetVReg(m, reg, static_cast<uint32_t>(value_), kIntVReg)) { 2615 VLOG(jdwp) << "failed to set short/char local " << reg << " = " 2616 << static_cast<uint32_t>(value_); 2617 error_ = kFailureErrorCode; 2618 } 2619 break; 2620 case JDWP::JT_INT: 2621 CHECK_EQ(width_, 4U); 2622 if (!SetVReg(m, reg, static_cast<uint32_t>(value_), kIntVReg)) { 2623 VLOG(jdwp) << "failed to set int local " << reg << " = " 2624 << static_cast<uint32_t>(value_); 2625 error_ = kFailureErrorCode; 2626 } 2627 break; 2628 case JDWP::JT_FLOAT: 2629 CHECK_EQ(width_, 4U); 2630 if (!SetVReg(m, reg, static_cast<uint32_t>(value_), kFloatVReg)) { 2631 VLOG(jdwp) << "failed to set float local " << reg << " = " 2632 << static_cast<uint32_t>(value_); 2633 error_ = kFailureErrorCode; 2634 } 2635 break; 2636 case JDWP::JT_ARRAY: 2637 case JDWP::JT_CLASS_LOADER: 2638 case JDWP::JT_CLASS_OBJECT: 2639 case JDWP::JT_OBJECT: 2640 case JDWP::JT_STRING: 2641 case JDWP::JT_THREAD: 2642 case JDWP::JT_THREAD_GROUP: { 2643 CHECK_EQ(width_, sizeof(JDWP::ObjectId)); 2644 mirror::Object* o = gRegistry->Get<mirror::Object*>(static_cast<JDWP::ObjectId>(value_)); 2645 if (o == ObjectRegistry::kInvalidObject) { 2646 VLOG(jdwp) << tag_ << " object " << o << " is an invalid object"; 2647 error_ = JDWP::ERR_INVALID_OBJECT; 2648 } else if (!SetVReg(m, reg, static_cast<uint32_t>(reinterpret_cast<uintptr_t>(o)), 2649 kReferenceVReg)) { 2650 VLOG(jdwp) << "failed to set " << tag_ << " object local " << reg << " = " << o; 2651 error_ = kFailureErrorCode; 2652 } 2653 break; 2654 } 2655 case JDWP::JT_DOUBLE: { 2656 CHECK_EQ(width_, 8U); 2657 bool success = SetVRegPair(m, reg, value_, kDoubleLoVReg, kDoubleHiVReg); 2658 if (!success) { 2659 VLOG(jdwp) << "failed to set double local " << reg << " = " << value_; 2660 error_ = kFailureErrorCode; 2661 } 2662 break; 2663 } 2664 case JDWP::JT_LONG: { 2665 CHECK_EQ(width_, 8U); 2666 bool success = SetVRegPair(m, reg, value_, kLongLoVReg, kLongHiVReg); 2667 if (!success) { 2668 VLOG(jdwp) << "failed to set double local " << reg << " = " << value_; 2669 error_ = kFailureErrorCode; 2670 } 2671 break; 2672 } 2673 default: 2674 LOG(FATAL) << "Unknown tag " << tag_; 2675 break; 2676 } 2677 return false; 2678 } 2679 2680 const JDWP::FrameId frame_id_; 2681 const int slot_; 2682 const JDWP::JdwpTag tag_; 2683 const uint64_t value_; 2684 const size_t width_; 2685 JDWP::JdwpError error_; 2686 }; 2687 2688 ScopedObjectAccessUnchecked soa(Thread::Current()); 2689 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2690 Thread* thread; 2691 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 2692 if (error != JDWP::ERR_NONE) { 2693 return error; 2694 } 2695 // TODO check thread is suspended by the debugger ? 2696 std::unique_ptr<Context> context(Context::Create()); 2697 SetLocalVisitor visitor(thread, context.get(), frame_id, slot, tag, value, width); 2698 visitor.WalkStack(); 2699 return visitor.error_; 2700} 2701 2702static void SetEventLocation(JDWP::EventLocation* location, mirror::ArtMethod* m, uint32_t dex_pc) 2703 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2704 DCHECK(location != nullptr); 2705 if (m == nullptr) { 2706 memset(location, 0, sizeof(*location)); 2707 } else { 2708 location->method = m; 2709 location->dex_pc = (m->IsNative() || m->IsProxyMethod()) ? static_cast<uint32_t>(-1) : dex_pc; 2710 } 2711} 2712 2713void Dbg::PostLocationEvent(mirror::ArtMethod* m, int dex_pc, mirror::Object* this_object, 2714 int event_flags, const JValue* return_value) { 2715 if (!IsDebuggerActive()) { 2716 return; 2717 } 2718 DCHECK(m != nullptr); 2719 DCHECK_EQ(m->IsStatic(), this_object == nullptr); 2720 JDWP::EventLocation location; 2721 SetEventLocation(&location, m, dex_pc); 2722 2723 gJdwpState->PostLocationEvent(&location, this_object, event_flags, return_value); 2724} 2725 2726void Dbg::PostFieldAccessEvent(mirror::ArtMethod* m, int dex_pc, 2727 mirror::Object* this_object, mirror::ArtField* f) { 2728 if (!IsDebuggerActive()) { 2729 return; 2730 } 2731 DCHECK(m != nullptr); 2732 DCHECK(f != nullptr); 2733 JDWP::EventLocation location; 2734 SetEventLocation(&location, m, dex_pc); 2735 2736 gJdwpState->PostFieldEvent(&location, f, this_object, nullptr, false); 2737} 2738 2739void Dbg::PostFieldModificationEvent(mirror::ArtMethod* m, int dex_pc, 2740 mirror::Object* this_object, mirror::ArtField* f, 2741 const JValue* field_value) { 2742 if (!IsDebuggerActive()) { 2743 return; 2744 } 2745 DCHECK(m != nullptr); 2746 DCHECK(f != nullptr); 2747 DCHECK(field_value != nullptr); 2748 JDWP::EventLocation location; 2749 SetEventLocation(&location, m, dex_pc); 2750 2751 gJdwpState->PostFieldEvent(&location, f, this_object, field_value, true); 2752} 2753 2754void Dbg::PostException(const ThrowLocation& throw_location, 2755 mirror::ArtMethod* catch_method, 2756 uint32_t catch_dex_pc, mirror::Throwable* exception_object) { 2757 if (!IsDebuggerActive()) { 2758 return; 2759 } 2760 JDWP::EventLocation exception_throw_location; 2761 SetEventLocation(&exception_throw_location, throw_location.GetMethod(), throw_location.GetDexPc()); 2762 JDWP::EventLocation exception_catch_location; 2763 SetEventLocation(&exception_catch_location, catch_method, catch_dex_pc); 2764 2765 gJdwpState->PostException(&exception_throw_location, exception_object, &exception_catch_location, 2766 throw_location.GetThis()); 2767} 2768 2769void Dbg::PostClassPrepare(mirror::Class* c) { 2770 if (!IsDebuggerActive()) { 2771 return; 2772 } 2773 gJdwpState->PostClassPrepare(c); 2774} 2775 2776void Dbg::UpdateDebugger(Thread* thread, mirror::Object* this_object, 2777 mirror::ArtMethod* m, uint32_t dex_pc, 2778 int event_flags, const JValue* return_value) { 2779 if (!IsDebuggerActive() || dex_pc == static_cast<uint32_t>(-2) /* fake method exit */) { 2780 return; 2781 } 2782 2783 if (IsBreakpoint(m, dex_pc)) { 2784 event_flags |= kBreakpoint; 2785 } 2786 2787 // If the debugger is single-stepping one of our threads, check to 2788 // see if we're that thread and we've reached a step point. 2789 const SingleStepControl* single_step_control = thread->GetSingleStepControl(); 2790 DCHECK(single_step_control != nullptr); 2791 if (single_step_control->is_active) { 2792 CHECK(!m->IsNative()); 2793 if (single_step_control->step_depth == JDWP::SD_INTO) { 2794 // Step into method calls. We break when the line number 2795 // or method pointer changes. If we're in SS_MIN mode, we 2796 // always stop. 2797 if (single_step_control->method != m) { 2798 event_flags |= kSingleStep; 2799 VLOG(jdwp) << "SS new method"; 2800 } else if (single_step_control->step_size == JDWP::SS_MIN) { 2801 event_flags |= kSingleStep; 2802 VLOG(jdwp) << "SS new instruction"; 2803 } else if (single_step_control->ContainsDexPc(dex_pc)) { 2804 event_flags |= kSingleStep; 2805 VLOG(jdwp) << "SS new line"; 2806 } 2807 } else if (single_step_control->step_depth == JDWP::SD_OVER) { 2808 // Step over method calls. We break when the line number is 2809 // different and the frame depth is <= the original frame 2810 // depth. (We can't just compare on the method, because we 2811 // might get unrolled past it by an exception, and it's tricky 2812 // to identify recursion.) 2813 2814 int stack_depth = GetStackDepth(thread); 2815 2816 if (stack_depth < single_step_control->stack_depth) { 2817 // Popped up one or more frames, always trigger. 2818 event_flags |= kSingleStep; 2819 VLOG(jdwp) << "SS method pop"; 2820 } else if (stack_depth == single_step_control->stack_depth) { 2821 // Same depth, see if we moved. 2822 if (single_step_control->step_size == JDWP::SS_MIN) { 2823 event_flags |= kSingleStep; 2824 VLOG(jdwp) << "SS new instruction"; 2825 } else if (single_step_control->ContainsDexPc(dex_pc)) { 2826 event_flags |= kSingleStep; 2827 VLOG(jdwp) << "SS new line"; 2828 } 2829 } 2830 } else { 2831 CHECK_EQ(single_step_control->step_depth, JDWP::SD_OUT); 2832 // Return from the current method. We break when the frame 2833 // depth pops up. 2834 2835 // This differs from the "method exit" break in that it stops 2836 // with the PC at the next instruction in the returned-to 2837 // function, rather than the end of the returning function. 2838 2839 int stack_depth = GetStackDepth(thread); 2840 if (stack_depth < single_step_control->stack_depth) { 2841 event_flags |= kSingleStep; 2842 VLOG(jdwp) << "SS method pop"; 2843 } 2844 } 2845 } 2846 2847 // If there's something interesting going on, see if it matches one 2848 // of the debugger filters. 2849 if (event_flags != 0) { 2850 Dbg::PostLocationEvent(m, dex_pc, this_object, event_flags, return_value); 2851 } 2852} 2853 2854size_t* Dbg::GetReferenceCounterForEvent(uint32_t instrumentation_event) { 2855 switch (instrumentation_event) { 2856 case instrumentation::Instrumentation::kMethodEntered: 2857 return &method_enter_event_ref_count_; 2858 case instrumentation::Instrumentation::kMethodExited: 2859 return &method_exit_event_ref_count_; 2860 case instrumentation::Instrumentation::kDexPcMoved: 2861 return &dex_pc_change_event_ref_count_; 2862 case instrumentation::Instrumentation::kFieldRead: 2863 return &field_read_event_ref_count_; 2864 case instrumentation::Instrumentation::kFieldWritten: 2865 return &field_write_event_ref_count_; 2866 case instrumentation::Instrumentation::kExceptionCaught: 2867 return &exception_catch_event_ref_count_; 2868 default: 2869 return nullptr; 2870 } 2871} 2872 2873// Process request while all mutator threads are suspended. 2874void Dbg::ProcessDeoptimizationRequest(const DeoptimizationRequest& request) { 2875 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 2876 switch (request.GetKind()) { 2877 case DeoptimizationRequest::kNothing: 2878 LOG(WARNING) << "Ignoring empty deoptimization request."; 2879 break; 2880 case DeoptimizationRequest::kRegisterForEvent: 2881 VLOG(jdwp) << StringPrintf("Add debugger as listener for instrumentation event 0x%x", 2882 request.InstrumentationEvent()); 2883 instrumentation->AddListener(&gDebugInstrumentationListener, request.InstrumentationEvent()); 2884 instrumentation_events_ |= request.InstrumentationEvent(); 2885 break; 2886 case DeoptimizationRequest::kUnregisterForEvent: 2887 VLOG(jdwp) << StringPrintf("Remove debugger as listener for instrumentation event 0x%x", 2888 request.InstrumentationEvent()); 2889 instrumentation->RemoveListener(&gDebugInstrumentationListener, 2890 request.InstrumentationEvent()); 2891 instrumentation_events_ &= ~request.InstrumentationEvent(); 2892 break; 2893 case DeoptimizationRequest::kFullDeoptimization: 2894 VLOG(jdwp) << "Deoptimize the world ..."; 2895 instrumentation->DeoptimizeEverything(); 2896 VLOG(jdwp) << "Deoptimize the world DONE"; 2897 break; 2898 case DeoptimizationRequest::kFullUndeoptimization: 2899 VLOG(jdwp) << "Undeoptimize the world ..."; 2900 instrumentation->UndeoptimizeEverything(); 2901 VLOG(jdwp) << "Undeoptimize the world DONE"; 2902 break; 2903 case DeoptimizationRequest::kSelectiveDeoptimization: 2904 VLOG(jdwp) << "Deoptimize method " << PrettyMethod(request.Method()) << " ..."; 2905 instrumentation->Deoptimize(request.Method()); 2906 VLOG(jdwp) << "Deoptimize method " << PrettyMethod(request.Method()) << " DONE"; 2907 break; 2908 case DeoptimizationRequest::kSelectiveUndeoptimization: 2909 VLOG(jdwp) << "Undeoptimize method " << PrettyMethod(request.Method()) << " ..."; 2910 instrumentation->Undeoptimize(request.Method()); 2911 VLOG(jdwp) << "Undeoptimize method " << PrettyMethod(request.Method()) << " DONE"; 2912 break; 2913 default: 2914 LOG(FATAL) << "Unsupported deoptimization request kind " << request.GetKind(); 2915 break; 2916 } 2917} 2918 2919void Dbg::DelayFullUndeoptimization() { 2920 MutexLock mu(Thread::Current(), *Locks::deoptimization_lock_); 2921 ++delayed_full_undeoptimization_count_; 2922 DCHECK_LE(delayed_full_undeoptimization_count_, full_deoptimization_event_count_); 2923} 2924 2925void Dbg::ProcessDelayedFullUndeoptimizations() { 2926 // TODO: avoid taking the lock twice (once here and once in ManageDeoptimization). 2927 { 2928 MutexLock mu(Thread::Current(), *Locks::deoptimization_lock_); 2929 while (delayed_full_undeoptimization_count_ > 0) { 2930 DeoptimizationRequest req; 2931 req.SetKind(DeoptimizationRequest::kFullUndeoptimization); 2932 req.SetMethod(nullptr); 2933 RequestDeoptimizationLocked(req); 2934 --delayed_full_undeoptimization_count_; 2935 } 2936 } 2937 ManageDeoptimization(); 2938} 2939 2940void Dbg::RequestDeoptimization(const DeoptimizationRequest& req) { 2941 if (req.GetKind() == DeoptimizationRequest::kNothing) { 2942 // Nothing to do. 2943 return; 2944 } 2945 MutexLock mu(Thread::Current(), *Locks::deoptimization_lock_); 2946 RequestDeoptimizationLocked(req); 2947} 2948 2949void Dbg::RequestDeoptimizationLocked(const DeoptimizationRequest& req) { 2950 switch (req.GetKind()) { 2951 case DeoptimizationRequest::kRegisterForEvent: { 2952 DCHECK_NE(req.InstrumentationEvent(), 0u); 2953 size_t* counter = GetReferenceCounterForEvent(req.InstrumentationEvent()); 2954 CHECK(counter != nullptr) << StringPrintf("No counter for instrumentation event 0x%x", 2955 req.InstrumentationEvent()); 2956 if (*counter == 0) { 2957 VLOG(jdwp) << StringPrintf("Queue request #%zd to start listening to instrumentation event 0x%x", 2958 deoptimization_requests_.size(), req.InstrumentationEvent()); 2959 deoptimization_requests_.push_back(req); 2960 } 2961 *counter = *counter + 1; 2962 break; 2963 } 2964 case DeoptimizationRequest::kUnregisterForEvent: { 2965 DCHECK_NE(req.InstrumentationEvent(), 0u); 2966 size_t* counter = GetReferenceCounterForEvent(req.InstrumentationEvent()); 2967 CHECK(counter != nullptr) << StringPrintf("No counter for instrumentation event 0x%x", 2968 req.InstrumentationEvent()); 2969 *counter = *counter - 1; 2970 if (*counter == 0) { 2971 VLOG(jdwp) << StringPrintf("Queue request #%zd to stop listening to instrumentation event 0x%x", 2972 deoptimization_requests_.size(), req.InstrumentationEvent()); 2973 deoptimization_requests_.push_back(req); 2974 } 2975 break; 2976 } 2977 case DeoptimizationRequest::kFullDeoptimization: { 2978 DCHECK(req.Method() == nullptr); 2979 if (full_deoptimization_event_count_ == 0) { 2980 VLOG(jdwp) << "Queue request #" << deoptimization_requests_.size() 2981 << " for full deoptimization"; 2982 deoptimization_requests_.push_back(req); 2983 } 2984 ++full_deoptimization_event_count_; 2985 break; 2986 } 2987 case DeoptimizationRequest::kFullUndeoptimization: { 2988 DCHECK(req.Method() == nullptr); 2989 DCHECK_GT(full_deoptimization_event_count_, 0U); 2990 --full_deoptimization_event_count_; 2991 if (full_deoptimization_event_count_ == 0) { 2992 VLOG(jdwp) << "Queue request #" << deoptimization_requests_.size() 2993 << " for full undeoptimization"; 2994 deoptimization_requests_.push_back(req); 2995 } 2996 break; 2997 } 2998 case DeoptimizationRequest::kSelectiveDeoptimization: { 2999 DCHECK(req.Method() != nullptr); 3000 VLOG(jdwp) << "Queue request #" << deoptimization_requests_.size() 3001 << " for deoptimization of " << PrettyMethod(req.Method()); 3002 deoptimization_requests_.push_back(req); 3003 break; 3004 } 3005 case DeoptimizationRequest::kSelectiveUndeoptimization: { 3006 DCHECK(req.Method() != nullptr); 3007 VLOG(jdwp) << "Queue request #" << deoptimization_requests_.size() 3008 << " for undeoptimization of " << PrettyMethod(req.Method()); 3009 deoptimization_requests_.push_back(req); 3010 break; 3011 } 3012 default: { 3013 LOG(FATAL) << "Unknown deoptimization request kind " << req.GetKind(); 3014 break; 3015 } 3016 } 3017} 3018 3019void Dbg::ManageDeoptimization() { 3020 Thread* const self = Thread::Current(); 3021 { 3022 // Avoid suspend/resume if there is no pending request. 3023 MutexLock mu(self, *Locks::deoptimization_lock_); 3024 if (deoptimization_requests_.empty()) { 3025 return; 3026 } 3027 } 3028 CHECK_EQ(self->GetState(), kRunnable); 3029 self->TransitionFromRunnableToSuspended(kWaitingForDeoptimization); 3030 // We need to suspend mutator threads first. 3031 Runtime* const runtime = Runtime::Current(); 3032 runtime->GetThreadList()->SuspendAll(); 3033 const ThreadState old_state = self->SetStateUnsafe(kRunnable); 3034 { 3035 MutexLock mu(self, *Locks::deoptimization_lock_); 3036 size_t req_index = 0; 3037 for (DeoptimizationRequest& request : deoptimization_requests_) { 3038 VLOG(jdwp) << "Process deoptimization request #" << req_index++; 3039 ProcessDeoptimizationRequest(request); 3040 } 3041 deoptimization_requests_.clear(); 3042 } 3043 CHECK_EQ(self->SetStateUnsafe(old_state), kRunnable); 3044 runtime->GetThreadList()->ResumeAll(); 3045 self->TransitionFromSuspendedToRunnable(); 3046} 3047 3048static bool IsMethodPossiblyInlined(Thread* self, mirror::ArtMethod* m) 3049 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3050 const DexFile::CodeItem* code_item = m->GetCodeItem(); 3051 if (code_item == nullptr) { 3052 // TODO We should not be asked to watch location in a native or abstract method so the code item 3053 // should never be null. We could just check we never encounter this case. 3054 return false; 3055 } 3056 // Note: method verifier may cause thread suspension. 3057 self->AssertThreadSuspensionIsAllowable(); 3058 StackHandleScope<2> hs(self); 3059 mirror::Class* declaring_class = m->GetDeclaringClass(); 3060 Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache())); 3061 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader())); 3062 verifier::MethodVerifier verifier(dex_cache->GetDexFile(), &dex_cache, &class_loader, 3063 &m->GetClassDef(), code_item, m->GetDexMethodIndex(), m, 3064 m->GetAccessFlags(), false, true, false); 3065 // Note: we don't need to verify the method. 3066 return InlineMethodAnalyser::AnalyseMethodCode(&verifier, nullptr); 3067} 3068 3069static const Breakpoint* FindFirstBreakpointForMethod(mirror::ArtMethod* m) 3070 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, Locks::breakpoint_lock_) { 3071 for (Breakpoint& breakpoint : gBreakpoints) { 3072 if (breakpoint.Method() == m) { 3073 return &breakpoint; 3074 } 3075 } 3076 return nullptr; 3077} 3078 3079// Sanity checks all existing breakpoints on the same method. 3080static void SanityCheckExistingBreakpoints(mirror::ArtMethod* m, bool need_full_deoptimization) 3081 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, Locks::breakpoint_lock_) { 3082 for (const Breakpoint& breakpoint : gBreakpoints) { 3083 CHECK_EQ(need_full_deoptimization, breakpoint.NeedFullDeoptimization()); 3084 } 3085 if (need_full_deoptimization) { 3086 // We should have deoptimized everything but not "selectively" deoptimized this method. 3087 CHECK(Runtime::Current()->GetInstrumentation()->AreAllMethodsDeoptimized()); 3088 CHECK(!Runtime::Current()->GetInstrumentation()->IsDeoptimized(m)); 3089 } else { 3090 // We should have "selectively" deoptimized this method. 3091 // Note: while we have not deoptimized everything for this method, we may have done it for 3092 // another event. 3093 CHECK(Runtime::Current()->GetInstrumentation()->IsDeoptimized(m)); 3094 } 3095} 3096 3097// Installs a breakpoint at the specified location. Also indicates through the deoptimization 3098// request if we need to deoptimize. 3099void Dbg::WatchLocation(const JDWP::JdwpLocation* location, DeoptimizationRequest* req) { 3100 Thread* const self = Thread::Current(); 3101 mirror::ArtMethod* m = FromMethodId(location->method_id); 3102 DCHECK(m != nullptr) << "No method for method id " << location->method_id; 3103 3104 const Breakpoint* existing_breakpoint; 3105 { 3106 ReaderMutexLock mu(self, *Locks::breakpoint_lock_); 3107 existing_breakpoint = FindFirstBreakpointForMethod(m); 3108 } 3109 bool need_full_deoptimization; 3110 if (existing_breakpoint == nullptr) { 3111 // There is no breakpoint on this method yet: we need to deoptimize. If this method may be 3112 // inlined, we deoptimize everything; otherwise we deoptimize only this method. 3113 // Note: IsMethodPossiblyInlined goes into the method verifier and may cause thread suspension. 3114 // Therefore we must not hold any lock when we call it. 3115 need_full_deoptimization = IsMethodPossiblyInlined(self, m); 3116 if (need_full_deoptimization) { 3117 req->SetKind(DeoptimizationRequest::kFullDeoptimization); 3118 req->SetMethod(nullptr); 3119 } else { 3120 req->SetKind(DeoptimizationRequest::kSelectiveDeoptimization); 3121 req->SetMethod(m); 3122 } 3123 } else { 3124 // There is at least one breakpoint for this method: we don't need to deoptimize. 3125 req->SetKind(DeoptimizationRequest::kNothing); 3126 req->SetMethod(nullptr); 3127 3128 need_full_deoptimization = existing_breakpoint->NeedFullDeoptimization(); 3129 if (kIsDebugBuild) { 3130 ReaderMutexLock mu(self, *Locks::breakpoint_lock_); 3131 SanityCheckExistingBreakpoints(m, need_full_deoptimization); 3132 } 3133 } 3134 3135 { 3136 WriterMutexLock mu(self, *Locks::breakpoint_lock_); 3137 gBreakpoints.push_back(Breakpoint(m, location->dex_pc, need_full_deoptimization)); 3138 VLOG(jdwp) << "Set breakpoint #" << (gBreakpoints.size() - 1) << ": " 3139 << gBreakpoints[gBreakpoints.size() - 1]; 3140 } 3141} 3142 3143// Uninstalls a breakpoint at the specified location. Also indicates through the deoptimization 3144// request if we need to undeoptimize. 3145void Dbg::UnwatchLocation(const JDWP::JdwpLocation* location, DeoptimizationRequest* req) { 3146 WriterMutexLock mu(Thread::Current(), *Locks::breakpoint_lock_); 3147 mirror::ArtMethod* m = FromMethodId(location->method_id); 3148 DCHECK(m != nullptr) << "No method for method id " << location->method_id; 3149 bool need_full_deoptimization = false; 3150 for (size_t i = 0, e = gBreakpoints.size(); i < e; ++i) { 3151 if (gBreakpoints[i].DexPc() == location->dex_pc && gBreakpoints[i].Method() == m) { 3152 VLOG(jdwp) << "Removed breakpoint #" << i << ": " << gBreakpoints[i]; 3153 need_full_deoptimization = gBreakpoints[i].NeedFullDeoptimization(); 3154 DCHECK_NE(need_full_deoptimization, Runtime::Current()->GetInstrumentation()->IsDeoptimized(m)); 3155 gBreakpoints.erase(gBreakpoints.begin() + i); 3156 break; 3157 } 3158 } 3159 const Breakpoint* const existing_breakpoint = FindFirstBreakpointForMethod(m); 3160 if (existing_breakpoint == nullptr) { 3161 // There is no more breakpoint on this method: we need to undeoptimize. 3162 if (need_full_deoptimization) { 3163 // This method required full deoptimization: we need to undeoptimize everything. 3164 req->SetKind(DeoptimizationRequest::kFullUndeoptimization); 3165 req->SetMethod(nullptr); 3166 } else { 3167 // This method required selective deoptimization: we need to undeoptimize only that method. 3168 req->SetKind(DeoptimizationRequest::kSelectiveUndeoptimization); 3169 req->SetMethod(m); 3170 } 3171 } else { 3172 // There is at least one breakpoint for this method: we don't need to undeoptimize. 3173 req->SetKind(DeoptimizationRequest::kNothing); 3174 req->SetMethod(nullptr); 3175 if (kIsDebugBuild) { 3176 SanityCheckExistingBreakpoints(m, need_full_deoptimization); 3177 } 3178 } 3179} 3180 3181// Scoped utility class to suspend a thread so that we may do tasks such as walk its stack. Doesn't 3182// cause suspension if the thread is the current thread. 3183class ScopedThreadSuspension { 3184 public: 3185 ScopedThreadSuspension(Thread* self, JDWP::ObjectId thread_id) 3186 LOCKS_EXCLUDED(Locks::thread_list_lock_) 3187 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 3188 thread_(nullptr), 3189 error_(JDWP::ERR_NONE), 3190 self_suspend_(false), 3191 other_suspend_(false) { 3192 ScopedObjectAccessUnchecked soa(self); 3193 { 3194 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 3195 error_ = DecodeThread(soa, thread_id, thread_); 3196 } 3197 if (error_ == JDWP::ERR_NONE) { 3198 if (thread_ == soa.Self()) { 3199 self_suspend_ = true; 3200 } else { 3201 soa.Self()->TransitionFromRunnableToSuspended(kWaitingForDebuggerSuspension); 3202 jobject thread_peer = Dbg::GetObjectRegistry()->GetJObject(thread_id); 3203 bool timed_out; 3204 Thread* suspended_thread; 3205 { 3206 // Take suspend thread lock to avoid races with threads trying to suspend this one. 3207 MutexLock mu(soa.Self(), *Locks::thread_list_suspend_thread_lock_); 3208 ThreadList* thread_list = Runtime::Current()->GetThreadList(); 3209 suspended_thread = thread_list->SuspendThreadByPeer(thread_peer, true, true, &timed_out); 3210 } 3211 CHECK_EQ(soa.Self()->TransitionFromSuspendedToRunnable(), kWaitingForDebuggerSuspension); 3212 if (suspended_thread == nullptr) { 3213 // Thread terminated from under us while suspending. 3214 error_ = JDWP::ERR_INVALID_THREAD; 3215 } else { 3216 CHECK_EQ(suspended_thread, thread_); 3217 other_suspend_ = true; 3218 } 3219 } 3220 } 3221 } 3222 3223 Thread* GetThread() const { 3224 return thread_; 3225 } 3226 3227 JDWP::JdwpError GetError() const { 3228 return error_; 3229 } 3230 3231 ~ScopedThreadSuspension() { 3232 if (other_suspend_) { 3233 Runtime::Current()->GetThreadList()->Resume(thread_, true); 3234 } 3235 } 3236 3237 private: 3238 Thread* thread_; 3239 JDWP::JdwpError error_; 3240 bool self_suspend_; 3241 bool other_suspend_; 3242}; 3243 3244JDWP::JdwpError Dbg::ConfigureStep(JDWP::ObjectId thread_id, JDWP::JdwpStepSize step_size, 3245 JDWP::JdwpStepDepth step_depth) { 3246 Thread* self = Thread::Current(); 3247 ScopedThreadSuspension sts(self, thread_id); 3248 if (sts.GetError() != JDWP::ERR_NONE) { 3249 return sts.GetError(); 3250 } 3251 3252 // 3253 // Work out what Method* we're in, the current line number, and how deep the stack currently 3254 // is for step-out. 3255 // 3256 3257 struct SingleStepStackVisitor : public StackVisitor { 3258 explicit SingleStepStackVisitor(Thread* thread, SingleStepControl* single_step_control, 3259 int32_t* line_number) 3260 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3261 : StackVisitor(thread, NULL), single_step_control_(single_step_control), 3262 line_number_(line_number) { 3263 DCHECK_EQ(single_step_control_, thread->GetSingleStepControl()); 3264 single_step_control_->method = NULL; 3265 single_step_control_->stack_depth = 0; 3266 } 3267 3268 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 3269 // annotalysis. 3270 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 3271 mirror::ArtMethod* m = GetMethod(); 3272 if (!m->IsRuntimeMethod()) { 3273 ++single_step_control_->stack_depth; 3274 if (single_step_control_->method == NULL) { 3275 mirror::DexCache* dex_cache = m->GetDeclaringClass()->GetDexCache(); 3276 single_step_control_->method = m; 3277 *line_number_ = -1; 3278 if (dex_cache != NULL) { 3279 const DexFile& dex_file = *dex_cache->GetDexFile(); 3280 *line_number_ = dex_file.GetLineNumFromPC(m, GetDexPc()); 3281 } 3282 } 3283 } 3284 return true; 3285 } 3286 3287 SingleStepControl* const single_step_control_; 3288 int32_t* const line_number_; 3289 }; 3290 3291 Thread* const thread = sts.GetThread(); 3292 SingleStepControl* const single_step_control = thread->GetSingleStepControl(); 3293 DCHECK(single_step_control != nullptr); 3294 int32_t line_number = -1; 3295 SingleStepStackVisitor visitor(thread, single_step_control, &line_number); 3296 visitor.WalkStack(); 3297 3298 // 3299 // Find the dex_pc values that correspond to the current line, for line-based single-stepping. 3300 // 3301 3302 struct DebugCallbackContext { 3303 explicit DebugCallbackContext(SingleStepControl* single_step_control, int32_t line_number, 3304 const DexFile::CodeItem* code_item) 3305 : single_step_control_(single_step_control), line_number_(line_number), code_item_(code_item), 3306 last_pc_valid(false), last_pc(0) { 3307 } 3308 3309 static bool Callback(void* raw_context, uint32_t address, uint32_t line_number) { 3310 DebugCallbackContext* context = reinterpret_cast<DebugCallbackContext*>(raw_context); 3311 if (static_cast<int32_t>(line_number) == context->line_number_) { 3312 if (!context->last_pc_valid) { 3313 // Everything from this address until the next line change is ours. 3314 context->last_pc = address; 3315 context->last_pc_valid = true; 3316 } 3317 // Otherwise, if we're already in a valid range for this line, 3318 // just keep going (shouldn't really happen)... 3319 } else if (context->last_pc_valid) { // and the line number is new 3320 // Add everything from the last entry up until here to the set 3321 for (uint32_t dex_pc = context->last_pc; dex_pc < address; ++dex_pc) { 3322 context->single_step_control_->dex_pcs.insert(dex_pc); 3323 } 3324 context->last_pc_valid = false; 3325 } 3326 return false; // There may be multiple entries for any given line. 3327 } 3328 3329 ~DebugCallbackContext() { 3330 // If the line number was the last in the position table... 3331 if (last_pc_valid) { 3332 size_t end = code_item_->insns_size_in_code_units_; 3333 for (uint32_t dex_pc = last_pc; dex_pc < end; ++dex_pc) { 3334 single_step_control_->dex_pcs.insert(dex_pc); 3335 } 3336 } 3337 } 3338 3339 SingleStepControl* const single_step_control_; 3340 const int32_t line_number_; 3341 const DexFile::CodeItem* const code_item_; 3342 bool last_pc_valid; 3343 uint32_t last_pc; 3344 }; 3345 single_step_control->dex_pcs.clear(); 3346 mirror::ArtMethod* m = single_step_control->method; 3347 if (!m->IsNative()) { 3348 const DexFile::CodeItem* const code_item = m->GetCodeItem(); 3349 DebugCallbackContext context(single_step_control, line_number, code_item); 3350 m->GetDexFile()->DecodeDebugInfo(code_item, m->IsStatic(), m->GetDexMethodIndex(), 3351 DebugCallbackContext::Callback, NULL, &context); 3352 } 3353 3354 // 3355 // Everything else... 3356 // 3357 3358 single_step_control->step_size = step_size; 3359 single_step_control->step_depth = step_depth; 3360 single_step_control->is_active = true; 3361 3362 if (VLOG_IS_ON(jdwp)) { 3363 VLOG(jdwp) << "Single-step thread: " << *thread; 3364 VLOG(jdwp) << "Single-step step size: " << single_step_control->step_size; 3365 VLOG(jdwp) << "Single-step step depth: " << single_step_control->step_depth; 3366 VLOG(jdwp) << "Single-step current method: " << PrettyMethod(single_step_control->method); 3367 VLOG(jdwp) << "Single-step current line: " << line_number; 3368 VLOG(jdwp) << "Single-step current stack depth: " << single_step_control->stack_depth; 3369 VLOG(jdwp) << "Single-step dex_pc values:"; 3370 for (uint32_t dex_pc : single_step_control->dex_pcs) { 3371 VLOG(jdwp) << StringPrintf(" %#x", dex_pc); 3372 } 3373 } 3374 3375 return JDWP::ERR_NONE; 3376} 3377 3378void Dbg::UnconfigureStep(JDWP::ObjectId thread_id) { 3379 ScopedObjectAccessUnchecked soa(Thread::Current()); 3380 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 3381 Thread* thread; 3382 JDWP::JdwpError error = DecodeThread(soa, thread_id, thread); 3383 if (error == JDWP::ERR_NONE) { 3384 SingleStepControl* single_step_control = thread->GetSingleStepControl(); 3385 DCHECK(single_step_control != nullptr); 3386 single_step_control->Clear(); 3387 } 3388} 3389 3390static char JdwpTagToShortyChar(JDWP::JdwpTag tag) { 3391 switch (tag) { 3392 default: 3393 LOG(FATAL) << "unknown JDWP tag: " << PrintableChar(tag); 3394 3395 // Primitives. 3396 case JDWP::JT_BYTE: return 'B'; 3397 case JDWP::JT_CHAR: return 'C'; 3398 case JDWP::JT_FLOAT: return 'F'; 3399 case JDWP::JT_DOUBLE: return 'D'; 3400 case JDWP::JT_INT: return 'I'; 3401 case JDWP::JT_LONG: return 'J'; 3402 case JDWP::JT_SHORT: return 'S'; 3403 case JDWP::JT_VOID: return 'V'; 3404 case JDWP::JT_BOOLEAN: return 'Z'; 3405 3406 // Reference types. 3407 case JDWP::JT_ARRAY: 3408 case JDWP::JT_OBJECT: 3409 case JDWP::JT_STRING: 3410 case JDWP::JT_THREAD: 3411 case JDWP::JT_THREAD_GROUP: 3412 case JDWP::JT_CLASS_LOADER: 3413 case JDWP::JT_CLASS_OBJECT: 3414 return 'L'; 3415 } 3416} 3417 3418JDWP::JdwpError Dbg::InvokeMethod(JDWP::ObjectId thread_id, JDWP::ObjectId object_id, 3419 JDWP::RefTypeId class_id, JDWP::MethodId method_id, 3420 uint32_t arg_count, uint64_t* arg_values, 3421 JDWP::JdwpTag* arg_types, uint32_t options, 3422 JDWP::JdwpTag* pResultTag, uint64_t* pResultValue, 3423 JDWP::ObjectId* pExceptionId) { 3424 ThreadList* thread_list = Runtime::Current()->GetThreadList(); 3425 3426 Thread* targetThread = NULL; 3427 DebugInvokeReq* req = NULL; 3428 Thread* self = Thread::Current(); 3429 { 3430 ScopedObjectAccessUnchecked soa(self); 3431 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 3432 JDWP::JdwpError error = DecodeThread(soa, thread_id, targetThread); 3433 if (error != JDWP::ERR_NONE) { 3434 LOG(ERROR) << "InvokeMethod request for invalid thread id " << thread_id; 3435 return error; 3436 } 3437 req = targetThread->GetInvokeReq(); 3438 if (!req->ready) { 3439 LOG(ERROR) << "InvokeMethod request for thread not stopped by event: " << *targetThread; 3440 return JDWP::ERR_INVALID_THREAD; 3441 } 3442 3443 /* 3444 * We currently have a bug where we don't successfully resume the 3445 * target thread if the suspend count is too deep. We're expected to 3446 * require one "resume" for each "suspend", but when asked to execute 3447 * a method we have to resume fully and then re-suspend it back to the 3448 * same level. (The easiest way to cause this is to type "suspend" 3449 * multiple times in jdb.) 3450 * 3451 * It's unclear what this means when the event specifies "resume all" 3452 * and some threads are suspended more deeply than others. This is 3453 * a rare problem, so for now we just prevent it from hanging forever 3454 * by rejecting the method invocation request. Without this, we will 3455 * be stuck waiting on a suspended thread. 3456 */ 3457 int suspend_count; 3458 { 3459 MutexLock mu2(soa.Self(), *Locks::thread_suspend_count_lock_); 3460 suspend_count = targetThread->GetSuspendCount(); 3461 } 3462 if (suspend_count > 1) { 3463 LOG(ERROR) << *targetThread << " suspend count too deep for method invocation: " << suspend_count; 3464 return JDWP::ERR_THREAD_SUSPENDED; // Probably not expected here. 3465 } 3466 3467 JDWP::JdwpError status; 3468 mirror::Object* receiver = gRegistry->Get<mirror::Object*>(object_id); 3469 if (receiver == ObjectRegistry::kInvalidObject) { 3470 return JDWP::ERR_INVALID_OBJECT; 3471 } 3472 3473 mirror::Object* thread = gRegistry->Get<mirror::Object*>(thread_id); 3474 if (thread == ObjectRegistry::kInvalidObject) { 3475 return JDWP::ERR_INVALID_OBJECT; 3476 } 3477 // TODO: check that 'thread' is actually a java.lang.Thread! 3478 3479 mirror::Class* c = DecodeClass(class_id, status); 3480 if (c == NULL) { 3481 return status; 3482 } 3483 3484 mirror::ArtMethod* m = FromMethodId(method_id); 3485 if (m->IsStatic() != (receiver == NULL)) { 3486 return JDWP::ERR_INVALID_METHODID; 3487 } 3488 if (m->IsStatic()) { 3489 if (m->GetDeclaringClass() != c) { 3490 return JDWP::ERR_INVALID_METHODID; 3491 } 3492 } else { 3493 if (!m->GetDeclaringClass()->IsAssignableFrom(c)) { 3494 return JDWP::ERR_INVALID_METHODID; 3495 } 3496 } 3497 3498 // Check the argument list matches the method. 3499 uint32_t shorty_len = 0; 3500 const char* shorty = m->GetShorty(&shorty_len); 3501 if (shorty_len - 1 != arg_count) { 3502 return JDWP::ERR_ILLEGAL_ARGUMENT; 3503 } 3504 3505 { 3506 StackHandleScope<3> hs(soa.Self()); 3507 MethodHelper mh(hs.NewHandle(m)); 3508 HandleWrapper<mirror::Object> h_obj(hs.NewHandleWrapper(&receiver)); 3509 HandleWrapper<mirror::Class> h_klass(hs.NewHandleWrapper(&c)); 3510 const DexFile::TypeList* types = m->GetParameterTypeList(); 3511 for (size_t i = 0; i < arg_count; ++i) { 3512 if (shorty[i + 1] != JdwpTagToShortyChar(arg_types[i])) { 3513 return JDWP::ERR_ILLEGAL_ARGUMENT; 3514 } 3515 3516 if (shorty[i + 1] == 'L') { 3517 // Did we really get an argument of an appropriate reference type? 3518 mirror::Class* parameter_type = mh.GetClassFromTypeIdx(types->GetTypeItem(i).type_idx_); 3519 mirror::Object* argument = gRegistry->Get<mirror::Object*>(arg_values[i]); 3520 if (argument == ObjectRegistry::kInvalidObject) { 3521 return JDWP::ERR_INVALID_OBJECT; 3522 } 3523 if (argument != NULL && !argument->InstanceOf(parameter_type)) { 3524 return JDWP::ERR_ILLEGAL_ARGUMENT; 3525 } 3526 3527 // Turn the on-the-wire ObjectId into a jobject. 3528 jvalue& v = reinterpret_cast<jvalue&>(arg_values[i]); 3529 v.l = gRegistry->GetJObject(arg_values[i]); 3530 } 3531 } 3532 // Update in case it moved. 3533 m = mh.GetMethod(); 3534 } 3535 3536 req->receiver = receiver; 3537 req->thread = thread; 3538 req->klass = c; 3539 req->method = m; 3540 req->arg_count = arg_count; 3541 req->arg_values = arg_values; 3542 req->options = options; 3543 req->invoke_needed = true; 3544 } 3545 3546 // The fact that we've released the thread list lock is a bit risky --- if the thread goes 3547 // away we're sitting high and dry -- but we must release this before the ResumeAllThreads 3548 // call, and it's unwise to hold it during WaitForSuspend. 3549 3550 { 3551 /* 3552 * We change our (JDWP thread) status, which should be THREAD_RUNNING, 3553 * so we can suspend for a GC if the invoke request causes us to 3554 * run out of memory. It's also a good idea to change it before locking 3555 * the invokeReq mutex, although that should never be held for long. 3556 */ 3557 self->TransitionFromRunnableToSuspended(kWaitingForDebuggerSend); 3558 3559 VLOG(jdwp) << " Transferring control to event thread"; 3560 { 3561 MutexLock mu(self, req->lock); 3562 3563 if ((options & JDWP::INVOKE_SINGLE_THREADED) == 0) { 3564 VLOG(jdwp) << " Resuming all threads"; 3565 thread_list->UndoDebuggerSuspensions(); 3566 } else { 3567 VLOG(jdwp) << " Resuming event thread only"; 3568 thread_list->Resume(targetThread, true); 3569 } 3570 3571 // Wait for the request to finish executing. 3572 while (req->invoke_needed) { 3573 req->cond.Wait(self); 3574 } 3575 } 3576 VLOG(jdwp) << " Control has returned from event thread"; 3577 3578 /* wait for thread to re-suspend itself */ 3579 SuspendThread(thread_id, false /* request_suspension */); 3580 self->TransitionFromSuspendedToRunnable(); 3581 } 3582 3583 /* 3584 * Suspend the threads. We waited for the target thread to suspend 3585 * itself, so all we need to do is suspend the others. 3586 * 3587 * The suspendAllThreads() call will double-suspend the event thread, 3588 * so we want to resume the target thread once to keep the books straight. 3589 */ 3590 if ((options & JDWP::INVOKE_SINGLE_THREADED) == 0) { 3591 self->TransitionFromRunnableToSuspended(kWaitingForDebuggerSuspension); 3592 VLOG(jdwp) << " Suspending all threads"; 3593 thread_list->SuspendAllForDebugger(); 3594 self->TransitionFromSuspendedToRunnable(); 3595 VLOG(jdwp) << " Resuming event thread to balance the count"; 3596 thread_list->Resume(targetThread, true); 3597 } 3598 3599 // Copy the result. 3600 *pResultTag = req->result_tag; 3601 if (IsPrimitiveTag(req->result_tag)) { 3602 *pResultValue = req->result_value.GetJ(); 3603 } else { 3604 *pResultValue = gRegistry->Add(req->result_value.GetL()); 3605 } 3606 *pExceptionId = req->exception; 3607 return req->error; 3608} 3609 3610void Dbg::ExecuteMethod(DebugInvokeReq* pReq) { 3611 ScopedObjectAccess soa(Thread::Current()); 3612 3613 // We can be called while an exception is pending. We need 3614 // to preserve that across the method invocation. 3615 StackHandleScope<4> hs(soa.Self()); 3616 auto old_throw_this_object = hs.NewHandle<mirror::Object>(nullptr); 3617 auto old_throw_method = hs.NewHandle<mirror::ArtMethod>(nullptr); 3618 auto old_exception = hs.NewHandle<mirror::Throwable>(nullptr); 3619 uint32_t old_throw_dex_pc; 3620 bool old_exception_report_flag; 3621 { 3622 ThrowLocation old_throw_location; 3623 mirror::Throwable* old_exception_obj = soa.Self()->GetException(&old_throw_location); 3624 old_throw_this_object.Assign(old_throw_location.GetThis()); 3625 old_throw_method.Assign(old_throw_location.GetMethod()); 3626 old_exception.Assign(old_exception_obj); 3627 old_throw_dex_pc = old_throw_location.GetDexPc(); 3628 old_exception_report_flag = soa.Self()->IsExceptionReportedToInstrumentation(); 3629 soa.Self()->ClearException(); 3630 } 3631 3632 // Translate the method through the vtable, unless the debugger wants to suppress it. 3633 Handle<mirror::ArtMethod> m(hs.NewHandle(pReq->method)); 3634 if ((pReq->options & JDWP::INVOKE_NONVIRTUAL) == 0 && pReq->receiver != NULL) { 3635 mirror::ArtMethod* actual_method = pReq->klass->FindVirtualMethodForVirtualOrInterface(m.Get()); 3636 if (actual_method != m.Get()) { 3637 VLOG(jdwp) << "ExecuteMethod translated " << PrettyMethod(m.Get()) << " to " << PrettyMethod(actual_method); 3638 m.Assign(actual_method); 3639 } 3640 } 3641 VLOG(jdwp) << "ExecuteMethod " << PrettyMethod(m.Get()) 3642 << " receiver=" << pReq->receiver 3643 << " arg_count=" << pReq->arg_count; 3644 CHECK(m.Get() != nullptr); 3645 3646 CHECK_EQ(sizeof(jvalue), sizeof(uint64_t)); 3647 3648 pReq->result_value = InvokeWithJValues(soa, pReq->receiver, soa.EncodeMethod(m.Get()), 3649 reinterpret_cast<jvalue*>(pReq->arg_values)); 3650 3651 mirror::Throwable* exception = soa.Self()->GetException(NULL); 3652 soa.Self()->ClearException(); 3653 pReq->exception = gRegistry->Add(exception); 3654 pReq->result_tag = BasicTagFromDescriptor(m.Get()->GetShorty()); 3655 if (pReq->exception != 0) { 3656 VLOG(jdwp) << " JDWP invocation returning with exception=" << exception 3657 << " " << exception->Dump(); 3658 pReq->result_value.SetJ(0); 3659 } else if (pReq->result_tag == JDWP::JT_OBJECT) { 3660 /* if no exception thrown, examine object result more closely */ 3661 JDWP::JdwpTag new_tag = TagFromObject(soa, pReq->result_value.GetL()); 3662 if (new_tag != pReq->result_tag) { 3663 VLOG(jdwp) << " JDWP promoted result from " << pReq->result_tag << " to " << new_tag; 3664 pReq->result_tag = new_tag; 3665 } 3666 3667 /* 3668 * Register the object. We don't actually need an ObjectId yet, 3669 * but we do need to be sure that the GC won't move or discard the 3670 * object when we switch out of RUNNING. The ObjectId conversion 3671 * will add the object to the "do not touch" list. 3672 * 3673 * We can't use the "tracked allocation" mechanism here because 3674 * the object is going to be handed off to a different thread. 3675 */ 3676 gRegistry->Add(pReq->result_value.GetL()); 3677 } 3678 3679 if (old_exception.Get() != NULL) { 3680 ThrowLocation gc_safe_throw_location(old_throw_this_object.Get(), old_throw_method.Get(), 3681 old_throw_dex_pc); 3682 soa.Self()->SetException(gc_safe_throw_location, old_exception.Get()); 3683 soa.Self()->SetExceptionReportedToInstrumentation(old_exception_report_flag); 3684 } 3685} 3686 3687/* 3688 * "request" contains a full JDWP packet, possibly with multiple chunks. We 3689 * need to process each, accumulate the replies, and ship the whole thing 3690 * back. 3691 * 3692 * Returns "true" if we have a reply. The reply buffer is newly allocated, 3693 * and includes the chunk type/length, followed by the data. 3694 * 3695 * OLD-TODO: we currently assume that the request and reply include a single 3696 * chunk. If this becomes inconvenient we will need to adapt. 3697 */ 3698bool Dbg::DdmHandlePacket(JDWP::Request& request, uint8_t** pReplyBuf, int* pReplyLen) { 3699 Thread* self = Thread::Current(); 3700 JNIEnv* env = self->GetJniEnv(); 3701 3702 uint32_t type = request.ReadUnsigned32("type"); 3703 uint32_t length = request.ReadUnsigned32("length"); 3704 3705 // Create a byte[] corresponding to 'request'. 3706 size_t request_length = request.size(); 3707 ScopedLocalRef<jbyteArray> dataArray(env, env->NewByteArray(request_length)); 3708 if (dataArray.get() == NULL) { 3709 LOG(WARNING) << "byte[] allocation failed: " << request_length; 3710 env->ExceptionClear(); 3711 return false; 3712 } 3713 env->SetByteArrayRegion(dataArray.get(), 0, request_length, reinterpret_cast<const jbyte*>(request.data())); 3714 request.Skip(request_length); 3715 3716 // Run through and find all chunks. [Currently just find the first.] 3717 ScopedByteArrayRO contents(env, dataArray.get()); 3718 if (length != request_length) { 3719 LOG(WARNING) << StringPrintf("bad chunk found (len=%u pktLen=%zd)", length, request_length); 3720 return false; 3721 } 3722 3723 // Call "private static Chunk dispatch(int type, byte[] data, int offset, int length)". 3724 ScopedLocalRef<jobject> chunk(env, env->CallStaticObjectMethod(WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer, 3725 WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer_dispatch, 3726 type, dataArray.get(), 0, length)); 3727 if (env->ExceptionCheck()) { 3728 LOG(INFO) << StringPrintf("Exception thrown by dispatcher for 0x%08x", type); 3729 env->ExceptionDescribe(); 3730 env->ExceptionClear(); 3731 return false; 3732 } 3733 3734 if (chunk.get() == NULL) { 3735 return false; 3736 } 3737 3738 /* 3739 * Pull the pieces out of the chunk. We copy the results into a 3740 * newly-allocated buffer that the caller can free. We don't want to 3741 * continue using the Chunk object because nothing has a reference to it. 3742 * 3743 * We could avoid this by returning type/data/offset/length and having 3744 * the caller be aware of the object lifetime issues, but that 3745 * integrates the JDWP code more tightly into the rest of the runtime, and doesn't work 3746 * if we have responses for multiple chunks. 3747 * 3748 * So we're pretty much stuck with copying data around multiple times. 3749 */ 3750 ScopedLocalRef<jbyteArray> replyData(env, reinterpret_cast<jbyteArray>(env->GetObjectField(chunk.get(), WellKnownClasses::org_apache_harmony_dalvik_ddmc_Chunk_data))); 3751 jint offset = env->GetIntField(chunk.get(), WellKnownClasses::org_apache_harmony_dalvik_ddmc_Chunk_offset); 3752 length = env->GetIntField(chunk.get(), WellKnownClasses::org_apache_harmony_dalvik_ddmc_Chunk_length); 3753 type = env->GetIntField(chunk.get(), WellKnownClasses::org_apache_harmony_dalvik_ddmc_Chunk_type); 3754 3755 VLOG(jdwp) << StringPrintf("DDM reply: type=0x%08x data=%p offset=%d length=%d", type, replyData.get(), offset, length); 3756 if (length == 0 || replyData.get() == NULL) { 3757 return false; 3758 } 3759 3760 const int kChunkHdrLen = 8; 3761 uint8_t* reply = new uint8_t[length + kChunkHdrLen]; 3762 if (reply == NULL) { 3763 LOG(WARNING) << "malloc failed: " << (length + kChunkHdrLen); 3764 return false; 3765 } 3766 JDWP::Set4BE(reply + 0, type); 3767 JDWP::Set4BE(reply + 4, length); 3768 env->GetByteArrayRegion(replyData.get(), offset, length, reinterpret_cast<jbyte*>(reply + kChunkHdrLen)); 3769 3770 *pReplyBuf = reply; 3771 *pReplyLen = length + kChunkHdrLen; 3772 3773 VLOG(jdwp) << StringPrintf("dvmHandleDdm returning type=%.4s %p len=%d", reinterpret_cast<char*>(reply), reply, length); 3774 return true; 3775} 3776 3777void Dbg::DdmBroadcast(bool connect) { 3778 VLOG(jdwp) << "Broadcasting DDM " << (connect ? "connect" : "disconnect") << "..."; 3779 3780 Thread* self = Thread::Current(); 3781 if (self->GetState() != kRunnable) { 3782 LOG(ERROR) << "DDM broadcast in thread state " << self->GetState(); 3783 /* try anyway? */ 3784 } 3785 3786 JNIEnv* env = self->GetJniEnv(); 3787 jint event = connect ? 1 /*DdmServer.CONNECTED*/ : 2 /*DdmServer.DISCONNECTED*/; 3788 env->CallStaticVoidMethod(WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer, 3789 WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer_broadcast, 3790 event); 3791 if (env->ExceptionCheck()) { 3792 LOG(ERROR) << "DdmServer.broadcast " << event << " failed"; 3793 env->ExceptionDescribe(); 3794 env->ExceptionClear(); 3795 } 3796} 3797 3798void Dbg::DdmConnected() { 3799 Dbg::DdmBroadcast(true); 3800} 3801 3802void Dbg::DdmDisconnected() { 3803 Dbg::DdmBroadcast(false); 3804 gDdmThreadNotification = false; 3805} 3806 3807/* 3808 * Send a notification when a thread starts, stops, or changes its name. 3809 * 3810 * Because we broadcast the full set of threads when the notifications are 3811 * first enabled, it's possible for "thread" to be actively executing. 3812 */ 3813void Dbg::DdmSendThreadNotification(Thread* t, uint32_t type) { 3814 if (!gDdmThreadNotification) { 3815 return; 3816 } 3817 3818 if (type == CHUNK_TYPE("THDE")) { 3819 uint8_t buf[4]; 3820 JDWP::Set4BE(&buf[0], t->GetThreadId()); 3821 Dbg::DdmSendChunk(CHUNK_TYPE("THDE"), 4, buf); 3822 } else { 3823 CHECK(type == CHUNK_TYPE("THCR") || type == CHUNK_TYPE("THNM")) << type; 3824 ScopedObjectAccessUnchecked soa(Thread::Current()); 3825 StackHandleScope<1> hs(soa.Self()); 3826 Handle<mirror::String> name(hs.NewHandle(t->GetThreadName(soa))); 3827 size_t char_count = (name.Get() != NULL) ? name->GetLength() : 0; 3828 const jchar* chars = (name.Get() != NULL) ? name->GetCharArray()->GetData() : NULL; 3829 3830 std::vector<uint8_t> bytes; 3831 JDWP::Append4BE(bytes, t->GetThreadId()); 3832 JDWP::AppendUtf16BE(bytes, chars, char_count); 3833 CHECK_EQ(bytes.size(), char_count*2 + sizeof(uint32_t)*2); 3834 Dbg::DdmSendChunk(type, bytes); 3835 } 3836} 3837 3838void Dbg::DdmSetThreadNotification(bool enable) { 3839 // Enable/disable thread notifications. 3840 gDdmThreadNotification = enable; 3841 if (enable) { 3842 // Suspend the VM then post thread start notifications for all threads. Threads attaching will 3843 // see a suspension in progress and block until that ends. They then post their own start 3844 // notification. 3845 SuspendVM(); 3846 std::list<Thread*> threads; 3847 Thread* self = Thread::Current(); 3848 { 3849 MutexLock mu(self, *Locks::thread_list_lock_); 3850 threads = Runtime::Current()->GetThreadList()->GetList(); 3851 } 3852 { 3853 ScopedObjectAccess soa(self); 3854 for (Thread* thread : threads) { 3855 Dbg::DdmSendThreadNotification(thread, CHUNK_TYPE("THCR")); 3856 } 3857 } 3858 ResumeVM(); 3859 } 3860} 3861 3862void Dbg::PostThreadStartOrStop(Thread* t, uint32_t type) { 3863 if (IsDebuggerActive()) { 3864 gJdwpState->PostThreadChange(t, type == CHUNK_TYPE("THCR")); 3865 } 3866 Dbg::DdmSendThreadNotification(t, type); 3867} 3868 3869void Dbg::PostThreadStart(Thread* t) { 3870 Dbg::PostThreadStartOrStop(t, CHUNK_TYPE("THCR")); 3871} 3872 3873void Dbg::PostThreadDeath(Thread* t) { 3874 Dbg::PostThreadStartOrStop(t, CHUNK_TYPE("THDE")); 3875} 3876 3877void Dbg::DdmSendChunk(uint32_t type, size_t byte_count, const uint8_t* buf) { 3878 CHECK(buf != NULL); 3879 iovec vec[1]; 3880 vec[0].iov_base = reinterpret_cast<void*>(const_cast<uint8_t*>(buf)); 3881 vec[0].iov_len = byte_count; 3882 Dbg::DdmSendChunkV(type, vec, 1); 3883} 3884 3885void Dbg::DdmSendChunk(uint32_t type, const std::vector<uint8_t>& bytes) { 3886 DdmSendChunk(type, bytes.size(), &bytes[0]); 3887} 3888 3889void Dbg::DdmSendChunkV(uint32_t type, const iovec* iov, int iov_count) { 3890 if (gJdwpState == NULL) { 3891 VLOG(jdwp) << "Debugger thread not active, ignoring DDM send: " << type; 3892 } else { 3893 gJdwpState->DdmSendChunkV(type, iov, iov_count); 3894 } 3895} 3896 3897int Dbg::DdmHandleHpifChunk(HpifWhen when) { 3898 if (when == HPIF_WHEN_NOW) { 3899 DdmSendHeapInfo(when); 3900 return true; 3901 } 3902 3903 if (when != HPIF_WHEN_NEVER && when != HPIF_WHEN_NEXT_GC && when != HPIF_WHEN_EVERY_GC) { 3904 LOG(ERROR) << "invalid HpifWhen value: " << static_cast<int>(when); 3905 return false; 3906 } 3907 3908 gDdmHpifWhen = when; 3909 return true; 3910} 3911 3912bool Dbg::DdmHandleHpsgNhsgChunk(Dbg::HpsgWhen when, Dbg::HpsgWhat what, bool native) { 3913 if (when != HPSG_WHEN_NEVER && when != HPSG_WHEN_EVERY_GC) { 3914 LOG(ERROR) << "invalid HpsgWhen value: " << static_cast<int>(when); 3915 return false; 3916 } 3917 3918 if (what != HPSG_WHAT_MERGED_OBJECTS && what != HPSG_WHAT_DISTINCT_OBJECTS) { 3919 LOG(ERROR) << "invalid HpsgWhat value: " << static_cast<int>(what); 3920 return false; 3921 } 3922 3923 if (native) { 3924 gDdmNhsgWhen = when; 3925 gDdmNhsgWhat = what; 3926 } else { 3927 gDdmHpsgWhen = when; 3928 gDdmHpsgWhat = what; 3929 } 3930 return true; 3931} 3932 3933void Dbg::DdmSendHeapInfo(HpifWhen reason) { 3934 // If there's a one-shot 'when', reset it. 3935 if (reason == gDdmHpifWhen) { 3936 if (gDdmHpifWhen == HPIF_WHEN_NEXT_GC) { 3937 gDdmHpifWhen = HPIF_WHEN_NEVER; 3938 } 3939 } 3940 3941 /* 3942 * Chunk HPIF (client --> server) 3943 * 3944 * Heap Info. General information about the heap, 3945 * suitable for a summary display. 3946 * 3947 * [u4]: number of heaps 3948 * 3949 * For each heap: 3950 * [u4]: heap ID 3951 * [u8]: timestamp in ms since Unix epoch 3952 * [u1]: capture reason (same as 'when' value from server) 3953 * [u4]: max heap size in bytes (-Xmx) 3954 * [u4]: current heap size in bytes 3955 * [u4]: current number of bytes allocated 3956 * [u4]: current number of objects allocated 3957 */ 3958 uint8_t heap_count = 1; 3959 gc::Heap* heap = Runtime::Current()->GetHeap(); 3960 std::vector<uint8_t> bytes; 3961 JDWP::Append4BE(bytes, heap_count); 3962 JDWP::Append4BE(bytes, 1); // Heap id (bogus; we only have one heap). 3963 JDWP::Append8BE(bytes, MilliTime()); 3964 JDWP::Append1BE(bytes, reason); 3965 JDWP::Append4BE(bytes, heap->GetMaxMemory()); // Max allowed heap size in bytes. 3966 JDWP::Append4BE(bytes, heap->GetTotalMemory()); // Current heap size in bytes. 3967 JDWP::Append4BE(bytes, heap->GetBytesAllocated()); 3968 JDWP::Append4BE(bytes, heap->GetObjectsAllocated()); 3969 CHECK_EQ(bytes.size(), 4U + (heap_count * (4 + 8 + 1 + 4 + 4 + 4 + 4))); 3970 Dbg::DdmSendChunk(CHUNK_TYPE("HPIF"), bytes); 3971} 3972 3973enum HpsgSolidity { 3974 SOLIDITY_FREE = 0, 3975 SOLIDITY_HARD = 1, 3976 SOLIDITY_SOFT = 2, 3977 SOLIDITY_WEAK = 3, 3978 SOLIDITY_PHANTOM = 4, 3979 SOLIDITY_FINALIZABLE = 5, 3980 SOLIDITY_SWEEP = 6, 3981}; 3982 3983enum HpsgKind { 3984 KIND_OBJECT = 0, 3985 KIND_CLASS_OBJECT = 1, 3986 KIND_ARRAY_1 = 2, 3987 KIND_ARRAY_2 = 3, 3988 KIND_ARRAY_4 = 4, 3989 KIND_ARRAY_8 = 5, 3990 KIND_UNKNOWN = 6, 3991 KIND_NATIVE = 7, 3992}; 3993 3994#define HPSG_PARTIAL (1<<7) 3995#define HPSG_STATE(solidity, kind) ((uint8_t)((((kind) & 0x7) << 3) | ((solidity) & 0x7))) 3996 3997class HeapChunkContext { 3998 public: 3999 // Maximum chunk size. Obtain this from the formula: 4000 // (((maximum_heap_size / ALLOCATION_UNIT_SIZE) + 255) / 256) * 2 4001 HeapChunkContext(bool merge, bool native) 4002 : buf_(16384 - 16), 4003 type_(0), 4004 merge_(merge), 4005 chunk_overhead_(0) { 4006 Reset(); 4007 if (native) { 4008 type_ = CHUNK_TYPE("NHSG"); 4009 } else { 4010 type_ = merge ? CHUNK_TYPE("HPSG") : CHUNK_TYPE("HPSO"); 4011 } 4012 } 4013 4014 ~HeapChunkContext() { 4015 if (p_ > &buf_[0]) { 4016 Flush(); 4017 } 4018 } 4019 4020 void SetChunkOverhead(size_t chunk_overhead) { 4021 chunk_overhead_ = chunk_overhead; 4022 } 4023 4024 void ResetStartOfNextChunk() { 4025 startOfNextMemoryChunk_ = nullptr; 4026 } 4027 4028 void EnsureHeader(const void* chunk_ptr) { 4029 if (!needHeader_) { 4030 return; 4031 } 4032 4033 // Start a new HPSx chunk. 4034 JDWP::Write4BE(&p_, 1); // Heap id (bogus; we only have one heap). 4035 JDWP::Write1BE(&p_, 8); // Size of allocation unit, in bytes. 4036 4037 JDWP::Write4BE(&p_, reinterpret_cast<uintptr_t>(chunk_ptr)); // virtual address of segment start. 4038 JDWP::Write4BE(&p_, 0); // offset of this piece (relative to the virtual address). 4039 // [u4]: length of piece, in allocation units 4040 // We won't know this until we're done, so save the offset and stuff in a dummy value. 4041 pieceLenField_ = p_; 4042 JDWP::Write4BE(&p_, 0x55555555); 4043 needHeader_ = false; 4044 } 4045 4046 void Flush() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4047 if (pieceLenField_ == NULL) { 4048 // Flush immediately post Reset (maybe back-to-back Flush). Ignore. 4049 CHECK(needHeader_); 4050 return; 4051 } 4052 // Patch the "length of piece" field. 4053 CHECK_LE(&buf_[0], pieceLenField_); 4054 CHECK_LE(pieceLenField_, p_); 4055 JDWP::Set4BE(pieceLenField_, totalAllocationUnits_); 4056 4057 Dbg::DdmSendChunk(type_, p_ - &buf_[0], &buf_[0]); 4058 Reset(); 4059 } 4060 4061 static void HeapChunkCallback(void* start, void* end, size_t used_bytes, void* arg) 4062 SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, 4063 Locks::mutator_lock_) { 4064 reinterpret_cast<HeapChunkContext*>(arg)->HeapChunkCallback(start, end, used_bytes); 4065 } 4066 4067 private: 4068 enum { ALLOCATION_UNIT_SIZE = 8 }; 4069 4070 void Reset() { 4071 p_ = &buf_[0]; 4072 ResetStartOfNextChunk(); 4073 totalAllocationUnits_ = 0; 4074 needHeader_ = true; 4075 pieceLenField_ = NULL; 4076 } 4077 4078 void HeapChunkCallback(void* start, void* /*end*/, size_t used_bytes) 4079 SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, 4080 Locks::mutator_lock_) { 4081 // Note: heap call backs cannot manipulate the heap upon which they are crawling, care is taken 4082 // in the following code not to allocate memory, by ensuring buf_ is of the correct size 4083 if (used_bytes == 0) { 4084 if (start == NULL) { 4085 // Reset for start of new heap. 4086 startOfNextMemoryChunk_ = NULL; 4087 Flush(); 4088 } 4089 // Only process in use memory so that free region information 4090 // also includes dlmalloc book keeping. 4091 return; 4092 } 4093 4094 /* If we're looking at the native heap, we'll just return 4095 * (SOLIDITY_HARD, KIND_NATIVE) for all allocated chunks 4096 */ 4097 bool native = type_ == CHUNK_TYPE("NHSG"); 4098 4099 // TODO: I'm not sure using start of next chunk works well with multiple spaces. We shouldn't 4100 // count gaps inbetween spaces as free memory. 4101 if (startOfNextMemoryChunk_ != NULL) { 4102 // Transmit any pending free memory. Native free memory of 4103 // over kMaxFreeLen could be because of the use of mmaps, so 4104 // don't report. If not free memory then start a new segment. 4105 bool flush = true; 4106 if (start > startOfNextMemoryChunk_) { 4107 const size_t kMaxFreeLen = 2 * kPageSize; 4108 void* freeStart = startOfNextMemoryChunk_; 4109 void* freeEnd = start; 4110 size_t freeLen = reinterpret_cast<char*>(freeEnd) - reinterpret_cast<char*>(freeStart); 4111 if (!native || freeLen < kMaxFreeLen) { 4112 AppendChunk(HPSG_STATE(SOLIDITY_FREE, 0), freeStart, freeLen); 4113 flush = false; 4114 } 4115 } 4116 if (flush) { 4117 startOfNextMemoryChunk_ = NULL; 4118 Flush(); 4119 } 4120 } 4121 mirror::Object* obj = reinterpret_cast<mirror::Object*>(start); 4122 4123 // Determine the type of this chunk. 4124 // OLD-TODO: if context.merge, see if this chunk is different from the last chunk. 4125 // If it's the same, we should combine them. 4126 uint8_t state = ExamineObject(obj, native); 4127 AppendChunk(state, start, used_bytes + chunk_overhead_); 4128 startOfNextMemoryChunk_ = reinterpret_cast<char*>(start) + used_bytes + chunk_overhead_; 4129 } 4130 4131 void AppendChunk(uint8_t state, void* ptr, size_t length) 4132 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4133 // Make sure there's enough room left in the buffer. 4134 // We need to use two bytes for every fractional 256 allocation units used by the chunk plus 4135 // 17 bytes for any header. 4136 size_t needed = (((length/ALLOCATION_UNIT_SIZE + 255) / 256) * 2) + 17; 4137 size_t bytesLeft = buf_.size() - (size_t)(p_ - &buf_[0]); 4138 if (bytesLeft < needed) { 4139 Flush(); 4140 } 4141 4142 bytesLeft = buf_.size() - (size_t)(p_ - &buf_[0]); 4143 if (bytesLeft < needed) { 4144 LOG(WARNING) << "Chunk is too big to transmit (chunk_len=" << length << ", " 4145 << needed << " bytes)"; 4146 return; 4147 } 4148 EnsureHeader(ptr); 4149 // Write out the chunk description. 4150 length /= ALLOCATION_UNIT_SIZE; // Convert to allocation units. 4151 totalAllocationUnits_ += length; 4152 while (length > 256) { 4153 *p_++ = state | HPSG_PARTIAL; 4154 *p_++ = 255; // length - 1 4155 length -= 256; 4156 } 4157 *p_++ = state; 4158 *p_++ = length - 1; 4159 } 4160 4161 uint8_t ExamineObject(mirror::Object* o, bool is_native_heap) 4162 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 4163 if (o == NULL) { 4164 return HPSG_STATE(SOLIDITY_FREE, 0); 4165 } 4166 4167 // It's an allocated chunk. Figure out what it is. 4168 4169 // If we're looking at the native heap, we'll just return 4170 // (SOLIDITY_HARD, KIND_NATIVE) for all allocated chunks. 4171 if (is_native_heap) { 4172 return HPSG_STATE(SOLIDITY_HARD, KIND_NATIVE); 4173 } 4174 4175 if (!Runtime::Current()->GetHeap()->IsLiveObjectLocked(o)) { 4176 return HPSG_STATE(SOLIDITY_HARD, KIND_NATIVE); 4177 } 4178 4179 mirror::Class* c = o->GetClass(); 4180 if (c == NULL) { 4181 // The object was probably just created but hasn't been initialized yet. 4182 return HPSG_STATE(SOLIDITY_HARD, KIND_OBJECT); 4183 } 4184 4185 if (!Runtime::Current()->GetHeap()->IsValidObjectAddress(c)) { 4186 LOG(ERROR) << "Invalid class for managed heap object: " << o << " " << c; 4187 return HPSG_STATE(SOLIDITY_HARD, KIND_UNKNOWN); 4188 } 4189 4190 if (c->IsClassClass()) { 4191 return HPSG_STATE(SOLIDITY_HARD, KIND_CLASS_OBJECT); 4192 } 4193 4194 if (c->IsArrayClass()) { 4195 if (o->IsObjectArray()) { 4196 return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_4); 4197 } 4198 switch (c->GetComponentSize()) { 4199 case 1: return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_1); 4200 case 2: return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_2); 4201 case 4: return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_4); 4202 case 8: return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_8); 4203 } 4204 } 4205 4206 return HPSG_STATE(SOLIDITY_HARD, KIND_OBJECT); 4207 } 4208 4209 std::vector<uint8_t> buf_; 4210 uint8_t* p_; 4211 uint8_t* pieceLenField_; 4212 void* startOfNextMemoryChunk_; 4213 size_t totalAllocationUnits_; 4214 uint32_t type_; 4215 bool merge_; 4216 bool needHeader_; 4217 size_t chunk_overhead_; 4218 4219 DISALLOW_COPY_AND_ASSIGN(HeapChunkContext); 4220}; 4221 4222static void BumpPointerSpaceCallback(mirror::Object* obj, void* arg) 4223 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 4224 const size_t size = RoundUp(obj->SizeOf(), kObjectAlignment); 4225 HeapChunkContext::HeapChunkCallback( 4226 obj, reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(obj) + size), size, arg); 4227} 4228 4229void Dbg::DdmSendHeapSegments(bool native) { 4230 Dbg::HpsgWhen when; 4231 Dbg::HpsgWhat what; 4232 if (!native) { 4233 when = gDdmHpsgWhen; 4234 what = gDdmHpsgWhat; 4235 } else { 4236 when = gDdmNhsgWhen; 4237 what = gDdmNhsgWhat; 4238 } 4239 if (when == HPSG_WHEN_NEVER) { 4240 return; 4241 } 4242 4243 // Figure out what kind of chunks we'll be sending. 4244 CHECK(what == HPSG_WHAT_MERGED_OBJECTS || what == HPSG_WHAT_DISTINCT_OBJECTS) << static_cast<int>(what); 4245 4246 // First, send a heap start chunk. 4247 uint8_t heap_id[4]; 4248 JDWP::Set4BE(&heap_id[0], 1); // Heap id (bogus; we only have one heap). 4249 Dbg::DdmSendChunk(native ? CHUNK_TYPE("NHST") : CHUNK_TYPE("HPST"), sizeof(heap_id), heap_id); 4250 4251 Thread* self = Thread::Current(); 4252 4253 // To allow the Walk/InspectAll() below to exclusively-lock the 4254 // mutator lock, temporarily release the shared access to the 4255 // mutator lock here by transitioning to the suspended state. 4256 Locks::mutator_lock_->AssertSharedHeld(self); 4257 self->TransitionFromRunnableToSuspended(kSuspended); 4258 4259 // Send a series of heap segment chunks. 4260 HeapChunkContext context((what == HPSG_WHAT_MERGED_OBJECTS), native); 4261 if (native) { 4262#ifdef USE_DLMALLOC 4263 dlmalloc_inspect_all(HeapChunkContext::HeapChunkCallback, &context); 4264#else 4265 UNIMPLEMENTED(WARNING) << "Native heap inspection is only supported with dlmalloc"; 4266#endif 4267 } else { 4268 gc::Heap* heap = Runtime::Current()->GetHeap(); 4269 for (const auto& space : heap->GetContinuousSpaces()) { 4270 if (space->IsDlMallocSpace()) { 4271 // dlmalloc's chunk header is 2 * sizeof(size_t), but if the previous chunk is in use for an 4272 // allocation then the first sizeof(size_t) may belong to it. 4273 context.SetChunkOverhead(sizeof(size_t)); 4274 space->AsDlMallocSpace()->Walk(HeapChunkContext::HeapChunkCallback, &context); 4275 } else if (space->IsRosAllocSpace()) { 4276 context.SetChunkOverhead(0); 4277 space->AsRosAllocSpace()->Walk(HeapChunkContext::HeapChunkCallback, &context); 4278 } else if (space->IsBumpPointerSpace()) { 4279 context.SetChunkOverhead(0); 4280 ReaderMutexLock mu(self, *Locks::mutator_lock_); 4281 WriterMutexLock mu2(self, *Locks::heap_bitmap_lock_); 4282 space->AsBumpPointerSpace()->Walk(BumpPointerSpaceCallback, &context); 4283 } else { 4284 UNIMPLEMENTED(WARNING) << "Not counting objects in space " << *space; 4285 } 4286 context.ResetStartOfNextChunk(); 4287 } 4288 // Walk the large objects, these are not in the AllocSpace. 4289 context.SetChunkOverhead(0); 4290 heap->GetLargeObjectsSpace()->Walk(HeapChunkContext::HeapChunkCallback, &context); 4291 } 4292 4293 // Shared-lock the mutator lock back. 4294 self->TransitionFromSuspendedToRunnable(); 4295 Locks::mutator_lock_->AssertSharedHeld(self); 4296 4297 // Finally, send a heap end chunk. 4298 Dbg::DdmSendChunk(native ? CHUNK_TYPE("NHEN") : CHUNK_TYPE("HPEN"), sizeof(heap_id), heap_id); 4299} 4300 4301static size_t GetAllocTrackerMax() { 4302#ifdef HAVE_ANDROID_OS 4303 // Check whether there's a system property overriding the number of records. 4304 const char* propertyName = "dalvik.vm.allocTrackerMax"; 4305 char allocRecordMaxString[PROPERTY_VALUE_MAX]; 4306 if (property_get(propertyName, allocRecordMaxString, "") > 0) { 4307 char* end; 4308 size_t value = strtoul(allocRecordMaxString, &end, 10); 4309 if (*end != '\0') { 4310 LOG(ERROR) << "Ignoring " << propertyName << " '" << allocRecordMaxString 4311 << "' --- invalid"; 4312 return kDefaultNumAllocRecords; 4313 } 4314 if (!IsPowerOfTwo(value)) { 4315 LOG(ERROR) << "Ignoring " << propertyName << " '" << allocRecordMaxString 4316 << "' --- not power of two"; 4317 return kDefaultNumAllocRecords; 4318 } 4319 return value; 4320 } 4321#endif 4322 return kDefaultNumAllocRecords; 4323} 4324 4325void Dbg::SetAllocTrackingEnabled(bool enable) { 4326 Thread* self = Thread::Current(); 4327 if (enable) { 4328 { 4329 MutexLock mu(self, *Locks::alloc_tracker_lock_); 4330 if (recent_allocation_records_ != NULL) { 4331 return; // Already enabled, bail. 4332 } 4333 alloc_record_max_ = GetAllocTrackerMax(); 4334 LOG(INFO) << "Enabling alloc tracker (" << alloc_record_max_ << " entries of " 4335 << kMaxAllocRecordStackDepth << " frames, taking " 4336 << PrettySize(sizeof(AllocRecord) * alloc_record_max_) << ")"; 4337 DCHECK_EQ(alloc_record_head_, 0U); 4338 DCHECK_EQ(alloc_record_count_, 0U); 4339 recent_allocation_records_ = new AllocRecord[alloc_record_max_]; 4340 CHECK(recent_allocation_records_ != NULL); 4341 } 4342 Runtime::Current()->GetInstrumentation()->InstrumentQuickAllocEntryPoints(false); 4343 } else { 4344 { 4345 ScopedObjectAccess soa(self); // For type_cache_.Clear(); 4346 MutexLock mu(self, *Locks::alloc_tracker_lock_); 4347 if (recent_allocation_records_ == NULL) { 4348 return; // Already disabled, bail. 4349 } 4350 LOG(INFO) << "Disabling alloc tracker"; 4351 delete[] recent_allocation_records_; 4352 recent_allocation_records_ = NULL; 4353 alloc_record_head_ = 0; 4354 alloc_record_count_ = 0; 4355 type_cache_.Clear(); 4356 } 4357 // If an allocation comes in before we uninstrument, we will safely drop it on the floor. 4358 Runtime::Current()->GetInstrumentation()->UninstrumentQuickAllocEntryPoints(false); 4359 } 4360} 4361 4362struct AllocRecordStackVisitor : public StackVisitor { 4363 AllocRecordStackVisitor(Thread* thread, AllocRecord* record) 4364 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 4365 : StackVisitor(thread, NULL), record(record), depth(0) {} 4366 4367 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 4368 // annotalysis. 4369 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 4370 if (depth >= kMaxAllocRecordStackDepth) { 4371 return false; 4372 } 4373 mirror::ArtMethod* m = GetMethod(); 4374 if (!m->IsRuntimeMethod()) { 4375 record->StackElement(depth)->SetMethod(m); 4376 record->StackElement(depth)->SetDexPc(GetDexPc()); 4377 ++depth; 4378 } 4379 return true; 4380 } 4381 4382 ~AllocRecordStackVisitor() { 4383 // Clear out any unused stack trace elements. 4384 for (; depth < kMaxAllocRecordStackDepth; ++depth) { 4385 record->StackElement(depth)->SetMethod(nullptr); 4386 record->StackElement(depth)->SetDexPc(0); 4387 } 4388 } 4389 4390 AllocRecord* record; 4391 size_t depth; 4392}; 4393 4394void Dbg::RecordAllocation(mirror::Class* type, size_t byte_count) { 4395 Thread* self = Thread::Current(); 4396 CHECK(self != NULL); 4397 4398 MutexLock mu(self, *Locks::alloc_tracker_lock_); 4399 if (recent_allocation_records_ == NULL) { 4400 // In the process of shutting down recording, bail. 4401 return; 4402 } 4403 4404 // Advance and clip. 4405 if (++alloc_record_head_ == alloc_record_max_) { 4406 alloc_record_head_ = 0; 4407 } 4408 4409 // Fill in the basics. 4410 AllocRecord* record = &recent_allocation_records_[alloc_record_head_]; 4411 record->SetType(type); 4412 record->SetByteCount(byte_count); 4413 record->SetThinLockId(self->GetThreadId()); 4414 4415 // Fill in the stack trace. 4416 AllocRecordStackVisitor visitor(self, record); 4417 visitor.WalkStack(); 4418 4419 if (alloc_record_count_ < alloc_record_max_) { 4420 ++alloc_record_count_; 4421 } 4422} 4423 4424// Returns the index of the head element. 4425// 4426// We point at the most-recently-written record, so if alloc_record_count_ is 1 4427// we want to use the current element. Take "head+1" and subtract count 4428// from it. 4429// 4430// We need to handle underflow in our circular buffer, so we add 4431// alloc_record_max_ and then mask it back down. 4432size_t Dbg::HeadIndex() { 4433 return (Dbg::alloc_record_head_ + 1 + Dbg::alloc_record_max_ - Dbg::alloc_record_count_) & 4434 (Dbg::alloc_record_max_ - 1); 4435} 4436 4437void Dbg::DumpRecentAllocations() { 4438 ScopedObjectAccess soa(Thread::Current()); 4439 MutexLock mu(soa.Self(), *Locks::alloc_tracker_lock_); 4440 if (recent_allocation_records_ == NULL) { 4441 LOG(INFO) << "Not recording tracked allocations"; 4442 return; 4443 } 4444 4445 // "i" is the head of the list. We want to start at the end of the 4446 // list and move forward to the tail. 4447 size_t i = HeadIndex(); 4448 const uint16_t capped_count = CappedAllocRecordCount(Dbg::alloc_record_count_); 4449 uint16_t count = capped_count; 4450 4451 LOG(INFO) << "Tracked allocations, (head=" << alloc_record_head_ << " count=" << count << ")"; 4452 while (count--) { 4453 AllocRecord* record = &recent_allocation_records_[i]; 4454 4455 LOG(INFO) << StringPrintf(" Thread %-2d %6zd bytes ", record->ThinLockId(), record->ByteCount()) 4456 << PrettyClass(record->Type()); 4457 4458 for (size_t stack_frame = 0; stack_frame < kMaxAllocRecordStackDepth; ++stack_frame) { 4459 AllocRecordStackTraceElement* stack_element = record->StackElement(stack_frame); 4460 mirror::ArtMethod* m = stack_element->Method(); 4461 if (m == NULL) { 4462 break; 4463 } 4464 LOG(INFO) << " " << PrettyMethod(m) << " line " << stack_element->LineNumber(); 4465 } 4466 4467 // pause periodically to help logcat catch up 4468 if ((count % 5) == 0) { 4469 usleep(40000); 4470 } 4471 4472 i = (i + 1) & (alloc_record_max_ - 1); 4473 } 4474} 4475 4476class StringTable { 4477 public: 4478 StringTable() { 4479 } 4480 4481 void Add(const std::string& str) { 4482 table_.insert(str); 4483 } 4484 4485 void Add(const char* str) { 4486 table_.insert(str); 4487 } 4488 4489 size_t IndexOf(const char* s) const { 4490 auto it = table_.find(s); 4491 if (it == table_.end()) { 4492 LOG(FATAL) << "IndexOf(\"" << s << "\") failed"; 4493 } 4494 return std::distance(table_.begin(), it); 4495 } 4496 4497 size_t Size() const { 4498 return table_.size(); 4499 } 4500 4501 void WriteTo(std::vector<uint8_t>& bytes) const { 4502 for (const std::string& str : table_) { 4503 const char* s = str.c_str(); 4504 size_t s_len = CountModifiedUtf8Chars(s); 4505 std::unique_ptr<uint16_t> s_utf16(new uint16_t[s_len]); 4506 ConvertModifiedUtf8ToUtf16(s_utf16.get(), s); 4507 JDWP::AppendUtf16BE(bytes, s_utf16.get(), s_len); 4508 } 4509 } 4510 4511 private: 4512 std::set<std::string> table_; 4513 DISALLOW_COPY_AND_ASSIGN(StringTable); 4514}; 4515 4516static const char* GetMethodSourceFile(mirror::ArtMethod* method) 4517 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4518 DCHECK(method != nullptr); 4519 const char* source_file = method->GetDeclaringClassSourceFile(); 4520 return (source_file != nullptr) ? source_file : ""; 4521} 4522 4523/* 4524 * The data we send to DDMS contains everything we have recorded. 4525 * 4526 * Message header (all values big-endian): 4527 * (1b) message header len (to allow future expansion); includes itself 4528 * (1b) entry header len 4529 * (1b) stack frame len 4530 * (2b) number of entries 4531 * (4b) offset to string table from start of message 4532 * (2b) number of class name strings 4533 * (2b) number of method name strings 4534 * (2b) number of source file name strings 4535 * For each entry: 4536 * (4b) total allocation size 4537 * (2b) thread id 4538 * (2b) allocated object's class name index 4539 * (1b) stack depth 4540 * For each stack frame: 4541 * (2b) method's class name 4542 * (2b) method name 4543 * (2b) method source file 4544 * (2b) line number, clipped to 32767; -2 if native; -1 if no source 4545 * (xb) class name strings 4546 * (xb) method name strings 4547 * (xb) source file strings 4548 * 4549 * As with other DDM traffic, strings are sent as a 4-byte length 4550 * followed by UTF-16 data. 4551 * 4552 * We send up 16-bit unsigned indexes into string tables. In theory there 4553 * can be (kMaxAllocRecordStackDepth * alloc_record_max_) unique strings in 4554 * each table, but in practice there should be far fewer. 4555 * 4556 * The chief reason for using a string table here is to keep the size of 4557 * the DDMS message to a minimum. This is partly to make the protocol 4558 * efficient, but also because we have to form the whole thing up all at 4559 * once in a memory buffer. 4560 * 4561 * We use separate string tables for class names, method names, and source 4562 * files to keep the indexes small. There will generally be no overlap 4563 * between the contents of these tables. 4564 */ 4565jbyteArray Dbg::GetRecentAllocations() { 4566 if (false) { 4567 DumpRecentAllocations(); 4568 } 4569 4570 Thread* self = Thread::Current(); 4571 std::vector<uint8_t> bytes; 4572 { 4573 MutexLock mu(self, *Locks::alloc_tracker_lock_); 4574 // 4575 // Part 1: generate string tables. 4576 // 4577 StringTable class_names; 4578 StringTable method_names; 4579 StringTable filenames; 4580 4581 const uint16_t capped_count = CappedAllocRecordCount(Dbg::alloc_record_count_); 4582 uint16_t count = capped_count; 4583 size_t idx = HeadIndex(); 4584 while (count--) { 4585 AllocRecord* record = &recent_allocation_records_[idx]; 4586 std::string temp; 4587 class_names.Add(record->Type()->GetDescriptor(&temp)); 4588 for (size_t i = 0; i < kMaxAllocRecordStackDepth; i++) { 4589 mirror::ArtMethod* m = record->StackElement(i)->Method(); 4590 if (m != NULL) { 4591 class_names.Add(m->GetDeclaringClassDescriptor()); 4592 method_names.Add(m->GetName()); 4593 filenames.Add(GetMethodSourceFile(m)); 4594 } 4595 } 4596 4597 idx = (idx + 1) & (alloc_record_max_ - 1); 4598 } 4599 4600 LOG(INFO) << "allocation records: " << capped_count; 4601 4602 // 4603 // Part 2: Generate the output and store it in the buffer. 4604 // 4605 4606 // (1b) message header len (to allow future expansion); includes itself 4607 // (1b) entry header len 4608 // (1b) stack frame len 4609 const int kMessageHeaderLen = 15; 4610 const int kEntryHeaderLen = 9; 4611 const int kStackFrameLen = 8; 4612 JDWP::Append1BE(bytes, kMessageHeaderLen); 4613 JDWP::Append1BE(bytes, kEntryHeaderLen); 4614 JDWP::Append1BE(bytes, kStackFrameLen); 4615 4616 // (2b) number of entries 4617 // (4b) offset to string table from start of message 4618 // (2b) number of class name strings 4619 // (2b) number of method name strings 4620 // (2b) number of source file name strings 4621 JDWP::Append2BE(bytes, capped_count); 4622 size_t string_table_offset = bytes.size(); 4623 JDWP::Append4BE(bytes, 0); // We'll patch this later... 4624 JDWP::Append2BE(bytes, class_names.Size()); 4625 JDWP::Append2BE(bytes, method_names.Size()); 4626 JDWP::Append2BE(bytes, filenames.Size()); 4627 4628 idx = HeadIndex(); 4629 std::string temp; 4630 for (count = capped_count; count != 0; --count) { 4631 // For each entry: 4632 // (4b) total allocation size 4633 // (2b) thread id 4634 // (2b) allocated object's class name index 4635 // (1b) stack depth 4636 AllocRecord* record = &recent_allocation_records_[idx]; 4637 size_t stack_depth = record->GetDepth(); 4638 size_t allocated_object_class_name_index = 4639 class_names.IndexOf(record->Type()->GetDescriptor(&temp)); 4640 JDWP::Append4BE(bytes, record->ByteCount()); 4641 JDWP::Append2BE(bytes, record->ThinLockId()); 4642 JDWP::Append2BE(bytes, allocated_object_class_name_index); 4643 JDWP::Append1BE(bytes, stack_depth); 4644 4645 for (size_t stack_frame = 0; stack_frame < stack_depth; ++stack_frame) { 4646 // For each stack frame: 4647 // (2b) method's class name 4648 // (2b) method name 4649 // (2b) method source file 4650 // (2b) line number, clipped to 32767; -2 if native; -1 if no source 4651 mirror::ArtMethod* m = record->StackElement(stack_frame)->Method(); 4652 size_t class_name_index = class_names.IndexOf(m->GetDeclaringClassDescriptor()); 4653 size_t method_name_index = method_names.IndexOf(m->GetName()); 4654 size_t file_name_index = filenames.IndexOf(GetMethodSourceFile(m)); 4655 JDWP::Append2BE(bytes, class_name_index); 4656 JDWP::Append2BE(bytes, method_name_index); 4657 JDWP::Append2BE(bytes, file_name_index); 4658 JDWP::Append2BE(bytes, record->StackElement(stack_frame)->LineNumber()); 4659 } 4660 idx = (idx + 1) & (alloc_record_max_ - 1); 4661 } 4662 4663 // (xb) class name strings 4664 // (xb) method name strings 4665 // (xb) source file strings 4666 JDWP::Set4BE(&bytes[string_table_offset], bytes.size()); 4667 class_names.WriteTo(bytes); 4668 method_names.WriteTo(bytes); 4669 filenames.WriteTo(bytes); 4670 } 4671 JNIEnv* env = self->GetJniEnv(); 4672 jbyteArray result = env->NewByteArray(bytes.size()); 4673 if (result != NULL) { 4674 env->SetByteArrayRegion(result, 0, bytes.size(), reinterpret_cast<const jbyte*>(&bytes[0])); 4675 } 4676 return result; 4677} 4678 4679mirror::ArtMethod* DeoptimizationRequest::Method() const { 4680 ScopedObjectAccessUnchecked soa(Thread::Current()); 4681 return soa.DecodeMethod(method_); 4682} 4683 4684void DeoptimizationRequest::SetMethod(mirror::ArtMethod* m) { 4685 ScopedObjectAccessUnchecked soa(Thread::Current()); 4686 method_ = soa.EncodeMethod(m); 4687} 4688 4689} // namespace art 4690