debugger.cc revision 2cebb24bfc3247d3e9be138a3350106737455918
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 "art_field-inl.h" 25#include "class_linker.h" 26#include "class_linker-inl.h" 27#include "dex_file-inl.h" 28#include "dex_instruction.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 "mirror/art_method-inl.h" 35#include "mirror/class.h" 36#include "mirror/class-inl.h" 37#include "mirror/class_loader.h" 38#include "mirror/object-inl.h" 39#include "mirror/object_array-inl.h" 40#include "mirror/string-inl.h" 41#include "mirror/throwable.h" 42#include "quick/inline_method_analyser.h" 43#include "reflection.h" 44#include "safe_map.h" 45#include "scoped_thread_state_change.h" 46#include "ScopedLocalRef.h" 47#include "ScopedPrimitiveArray.h" 48#include "handle_scope-inl.h" 49#include "thread_list.h" 50#include "utf.h" 51#include "verifier/method_verifier-inl.h" 52#include "well_known_classes.h" 53 54#ifdef HAVE_ANDROID_OS 55#include "cutils/properties.h" 56#endif 57 58namespace art { 59 60static const size_t kMaxAllocRecordStackDepth = 16; // Max 255. 61static const size_t kDefaultNumAllocRecords = 64*1024; // Must be a power of 2. 2BE can hold 64k-1. 62 63// Limit alloc_record_count to the 2BE value that is the limit of the current protocol. 64static uint16_t CappedAllocRecordCount(size_t alloc_record_count) { 65 if (alloc_record_count > 0xffff) { 66 return 0xffff; 67 } 68 return alloc_record_count; 69} 70 71class AllocRecordStackTraceElement { 72 public: 73 AllocRecordStackTraceElement() : method_(nullptr), dex_pc_(0) { 74 } 75 76 int32_t LineNumber() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 77 mirror::ArtMethod* method = Method(); 78 DCHECK(method != nullptr); 79 return method->GetLineNumFromDexPC(DexPc()); 80 } 81 82 mirror::ArtMethod* Method() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 83 ScopedObjectAccessUnchecked soa(Thread::Current()); 84 return soa.DecodeMethod(method_); 85 } 86 87 void SetMethod(mirror::ArtMethod* m) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 88 ScopedObjectAccessUnchecked soa(Thread::Current()); 89 method_ = soa.EncodeMethod(m); 90 } 91 92 uint32_t DexPc() const { 93 return dex_pc_; 94 } 95 96 void SetDexPc(uint32_t pc) { 97 dex_pc_ = pc; 98 } 99 100 private: 101 jmethodID method_; 102 uint32_t dex_pc_; 103}; 104 105jobject Dbg::TypeCache::Add(mirror::Class* t) { 106 ScopedObjectAccessUnchecked soa(Thread::Current()); 107 JNIEnv* const env = soa.Env(); 108 ScopedLocalRef<jobject> local_ref(soa.Env(), soa.AddLocalReference<jobject>(t)); 109 const int32_t hash_code = soa.Decode<mirror::Class*>(local_ref.get())->IdentityHashCode(); 110 auto range = objects_.equal_range(hash_code); 111 for (auto it = range.first; it != range.second; ++it) { 112 if (soa.Decode<mirror::Class*>(it->second) == soa.Decode<mirror::Class*>(local_ref.get())) { 113 // Found a matching weak global, return it. 114 return it->second; 115 } 116 } 117 const jobject weak_global = env->NewWeakGlobalRef(local_ref.get()); 118 objects_.insert(std::make_pair(hash_code, weak_global)); 119 return weak_global; 120} 121 122void Dbg::TypeCache::Clear() { 123 JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 124 Thread* self = Thread::Current(); 125 for (const auto& p : objects_) { 126 vm->DeleteWeakGlobalRef(self, p.second); 127 } 128 objects_.clear(); 129} 130 131class AllocRecord { 132 public: 133 AllocRecord() : type_(nullptr), byte_count_(0), thin_lock_id_(0) {} 134 135 mirror::Class* Type() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 136 return down_cast<mirror::Class*>(Thread::Current()->DecodeJObject(type_)); 137 } 138 139 void SetType(mirror::Class* t) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, 140 Locks::alloc_tracker_lock_) { 141 type_ = Dbg::type_cache_.Add(t); 142 } 143 144 size_t GetDepth() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 145 size_t depth = 0; 146 while (depth < kMaxAllocRecordStackDepth && stack_[depth].Method() != nullptr) { 147 ++depth; 148 } 149 return depth; 150 } 151 152 size_t ByteCount() const { 153 return byte_count_; 154 } 155 156 void SetByteCount(size_t count) { 157 byte_count_ = count; 158 } 159 160 uint16_t ThinLockId() const { 161 return thin_lock_id_; 162 } 163 164 void SetThinLockId(uint16_t id) { 165 thin_lock_id_ = id; 166 } 167 168 AllocRecordStackTraceElement* StackElement(size_t index) { 169 DCHECK_LT(index, kMaxAllocRecordStackDepth); 170 return &stack_[index]; 171 } 172 173 private: 174 jobject type_; // This is a weak global. 175 size_t byte_count_; 176 uint16_t thin_lock_id_; 177 // Unused entries have null method. 178 AllocRecordStackTraceElement stack_[kMaxAllocRecordStackDepth]; 179}; 180 181class Breakpoint { 182 public: 183 Breakpoint(mirror::ArtMethod* method, uint32_t dex_pc, 184 DeoptimizationRequest::Kind deoptimization_kind) 185 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 186 : method_(nullptr), dex_pc_(dex_pc), deoptimization_kind_(deoptimization_kind) { 187 CHECK(deoptimization_kind_ == DeoptimizationRequest::kNothing || 188 deoptimization_kind_ == DeoptimizationRequest::kSelectiveDeoptimization || 189 deoptimization_kind_ == DeoptimizationRequest::kFullDeoptimization); 190 ScopedObjectAccessUnchecked soa(Thread::Current()); 191 method_ = soa.EncodeMethod(method); 192 } 193 194 Breakpoint(const Breakpoint& other) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 195 : method_(nullptr), dex_pc_(other.dex_pc_), 196 deoptimization_kind_(other.deoptimization_kind_) { 197 ScopedObjectAccessUnchecked soa(Thread::Current()); 198 method_ = soa.EncodeMethod(other.Method()); 199 } 200 201 mirror::ArtMethod* Method() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 202 ScopedObjectAccessUnchecked soa(Thread::Current()); 203 return soa.DecodeMethod(method_); 204 } 205 206 uint32_t DexPc() const { 207 return dex_pc_; 208 } 209 210 DeoptimizationRequest::Kind GetDeoptimizationKind() const { 211 return deoptimization_kind_; 212 } 213 214 private: 215 // The location of this breakpoint. 216 jmethodID method_; 217 uint32_t dex_pc_; 218 219 // Indicates whether breakpoint needs full deoptimization or selective deoptimization. 220 DeoptimizationRequest::Kind deoptimization_kind_; 221}; 222 223static std::ostream& operator<<(std::ostream& os, const Breakpoint& rhs) 224 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 225 os << StringPrintf("Breakpoint[%s @%#x]", PrettyMethod(rhs.Method()).c_str(), rhs.DexPc()); 226 return os; 227} 228 229class DebugInstrumentationListener FINAL : public instrumentation::InstrumentationListener { 230 public: 231 DebugInstrumentationListener() {} 232 virtual ~DebugInstrumentationListener() {} 233 234 void MethodEntered(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 235 uint32_t dex_pc ATTRIBUTE_UNUSED) 236 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 237 if (method->IsNative()) { 238 // TODO: post location events is a suspension point and native method entry stubs aren't. 239 return; 240 } 241 Dbg::UpdateDebugger(thread, this_object, method, 0, Dbg::kMethodEntry, nullptr); 242 } 243 244 void MethodExited(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 245 uint32_t dex_pc, const JValue& return_value) 246 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 247 if (method->IsNative()) { 248 // TODO: post location events is a suspension point and native method entry stubs aren't. 249 return; 250 } 251 Dbg::UpdateDebugger(thread, this_object, method, dex_pc, Dbg::kMethodExit, &return_value); 252 } 253 254 void MethodUnwind(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 255 uint32_t dex_pc) 256 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 257 // We're not recorded to listen to this kind of event, so complain. 258 UNUSED(thread, this_object, method, dex_pc); 259 LOG(ERROR) << "Unexpected method unwind event in debugger " << PrettyMethod(method) 260 << " " << dex_pc; 261 } 262 263 void DexPcMoved(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 264 uint32_t new_dex_pc) 265 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 266 Dbg::UpdateDebugger(thread, this_object, method, new_dex_pc, 0, nullptr); 267 } 268 269 void FieldRead(Thread* thread, mirror::Object* this_object, mirror::ArtMethod* method, 270 uint32_t dex_pc, ArtField* field) 271 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 272 UNUSED(thread); 273 Dbg::PostFieldAccessEvent(method, dex_pc, this_object, field); 274 } 275 276 void FieldWritten(Thread* thread ATTRIBUTE_UNUSED, mirror::Object* this_object, 277 mirror::ArtMethod* method, uint32_t dex_pc, ArtField* field, 278 const JValue& field_value) 279 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 280 Dbg::PostFieldModificationEvent(method, dex_pc, this_object, field, &field_value); 281 } 282 283 void ExceptionCaught(Thread* thread ATTRIBUTE_UNUSED, mirror::Throwable* exception_object) 284 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 285 Dbg::PostException(exception_object); 286 } 287 288 // We only care about how many backward branches were executed in the Jit. 289 void BackwardBranch(Thread* /*thread*/, mirror::ArtMethod* method, int32_t dex_pc_offset) 290 OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 291 LOG(ERROR) << "Unexpected backward branch event in debugger " << PrettyMethod(method) 292 << " " << dex_pc_offset; 293 } 294 295 private: 296 DISALLOW_COPY_AND_ASSIGN(DebugInstrumentationListener); 297} gDebugInstrumentationListener; 298 299// JDWP is allowed unless the Zygote forbids it. 300static bool gJdwpAllowed = true; 301 302// Was there a -Xrunjdwp or -agentlib:jdwp= argument on the command line? 303static bool gJdwpConfigured = false; 304 305// JDWP options for debugging. Only valid if IsJdwpConfigured() is true. 306static JDWP::JdwpOptions gJdwpOptions; 307 308// Runtime JDWP state. 309static JDWP::JdwpState* gJdwpState = nullptr; 310static bool gDebuggerConnected; // debugger or DDMS is connected. 311 312static bool gDdmThreadNotification = false; 313 314// DDMS GC-related settings. 315static Dbg::HpifWhen gDdmHpifWhen = Dbg::HPIF_WHEN_NEVER; 316static Dbg::HpsgWhen gDdmHpsgWhen = Dbg::HPSG_WHEN_NEVER; 317static Dbg::HpsgWhat gDdmHpsgWhat; 318static Dbg::HpsgWhen gDdmNhsgWhen = Dbg::HPSG_WHEN_NEVER; 319static Dbg::HpsgWhat gDdmNhsgWhat; 320 321bool Dbg::gDebuggerActive = false; 322bool Dbg::gDisposed = false; 323ObjectRegistry* Dbg::gRegistry = nullptr; 324 325// Recent allocation tracking. 326AllocRecord* Dbg::recent_allocation_records_ = nullptr; // TODO: CircularBuffer<AllocRecord> 327size_t Dbg::alloc_record_max_ = 0; 328size_t Dbg::alloc_record_head_ = 0; 329size_t Dbg::alloc_record_count_ = 0; 330Dbg::TypeCache Dbg::type_cache_; 331 332// Deoptimization support. 333std::vector<DeoptimizationRequest> Dbg::deoptimization_requests_; 334size_t Dbg::full_deoptimization_event_count_ = 0; 335 336// Instrumentation event reference counters. 337size_t Dbg::dex_pc_change_event_ref_count_ = 0; 338size_t Dbg::method_enter_event_ref_count_ = 0; 339size_t Dbg::method_exit_event_ref_count_ = 0; 340size_t Dbg::field_read_event_ref_count_ = 0; 341size_t Dbg::field_write_event_ref_count_ = 0; 342size_t Dbg::exception_catch_event_ref_count_ = 0; 343uint32_t Dbg::instrumentation_events_ = 0; 344 345// Breakpoints. 346static std::vector<Breakpoint> gBreakpoints GUARDED_BY(Locks::breakpoint_lock_); 347 348void DebugInvokeReq::VisitRoots(RootVisitor* visitor, const RootInfo& root_info) { 349 receiver.VisitRootIfNonNull(visitor, root_info); // null for static method call. 350 klass.VisitRoot(visitor, root_info); 351 method.VisitRoot(visitor, root_info); 352} 353 354void SingleStepControl::VisitRoots(RootVisitor* visitor, const RootInfo& root_info) { 355 visitor->VisitRootIfNonNull(reinterpret_cast<mirror::Object**>(&method_), root_info); 356} 357 358void SingleStepControl::AddDexPc(uint32_t dex_pc) { 359 dex_pcs_.insert(dex_pc); 360} 361 362bool SingleStepControl::ContainsDexPc(uint32_t dex_pc) const { 363 return dex_pcs_.find(dex_pc) == dex_pcs_.end(); 364} 365 366static bool IsBreakpoint(const mirror::ArtMethod* m, uint32_t dex_pc) 367 LOCKS_EXCLUDED(Locks::breakpoint_lock_) 368 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 369 ReaderMutexLock mu(Thread::Current(), *Locks::breakpoint_lock_); 370 for (size_t i = 0, e = gBreakpoints.size(); i < e; ++i) { 371 if (gBreakpoints[i].DexPc() == dex_pc && gBreakpoints[i].Method() == m) { 372 VLOG(jdwp) << "Hit breakpoint #" << i << ": " << gBreakpoints[i]; 373 return true; 374 } 375 } 376 return false; 377} 378 379static bool IsSuspendedForDebugger(ScopedObjectAccessUnchecked& soa, Thread* thread) 380 LOCKS_EXCLUDED(Locks::thread_suspend_count_lock_) { 381 MutexLock mu(soa.Self(), *Locks::thread_suspend_count_lock_); 382 // A thread may be suspended for GC; in this code, we really want to know whether 383 // there's a debugger suspension active. 384 return thread->IsSuspended() && thread->GetDebugSuspendCount() > 0; 385} 386 387static mirror::Array* DecodeNonNullArray(JDWP::RefTypeId id, JDWP::JdwpError* error) 388 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 389 mirror::Object* o = Dbg::GetObjectRegistry()->Get<mirror::Object*>(id, error); 390 if (o == nullptr) { 391 *error = JDWP::ERR_INVALID_OBJECT; 392 return nullptr; 393 } 394 if (!o->IsArrayInstance()) { 395 *error = JDWP::ERR_INVALID_ARRAY; 396 return nullptr; 397 } 398 *error = JDWP::ERR_NONE; 399 return o->AsArray(); 400} 401 402static mirror::Class* DecodeClass(JDWP::RefTypeId id, JDWP::JdwpError* error) 403 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 404 mirror::Object* o = Dbg::GetObjectRegistry()->Get<mirror::Object*>(id, error); 405 if (o == nullptr) { 406 *error = JDWP::ERR_INVALID_OBJECT; 407 return nullptr; 408 } 409 if (!o->IsClass()) { 410 *error = JDWP::ERR_INVALID_CLASS; 411 return nullptr; 412 } 413 *error = JDWP::ERR_NONE; 414 return o->AsClass(); 415} 416 417static Thread* DecodeThread(ScopedObjectAccessUnchecked& soa, JDWP::ObjectId thread_id, 418 JDWP::JdwpError* error) 419 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 420 LOCKS_EXCLUDED(Locks::thread_list_lock_, Locks::thread_suspend_count_lock_) { 421 mirror::Object* thread_peer = Dbg::GetObjectRegistry()->Get<mirror::Object*>(thread_id, error); 422 if (thread_peer == nullptr) { 423 // This isn't even an object. 424 *error = JDWP::ERR_INVALID_OBJECT; 425 return nullptr; 426 } 427 428 mirror::Class* java_lang_Thread = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread); 429 if (!java_lang_Thread->IsAssignableFrom(thread_peer->GetClass())) { 430 // This isn't a thread. 431 *error = JDWP::ERR_INVALID_THREAD; 432 return nullptr; 433 } 434 435 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 436 Thread* thread = Thread::FromManagedThread(soa, thread_peer); 437 // If thread is null then this a java.lang.Thread without a Thread*. Must be a un-started or a 438 // zombie. 439 *error = (thread == nullptr) ? JDWP::ERR_THREAD_NOT_ALIVE : JDWP::ERR_NONE; 440 return thread; 441} 442 443static JDWP::JdwpTag BasicTagFromDescriptor(const char* descriptor) { 444 // JDWP deliberately uses the descriptor characters' ASCII values for its enum. 445 // Note that by "basic" we mean that we don't get more specific than JT_OBJECT. 446 return static_cast<JDWP::JdwpTag>(descriptor[0]); 447} 448 449static JDWP::JdwpTag BasicTagFromClass(mirror::Class* klass) 450 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 451 std::string temp; 452 const char* descriptor = klass->GetDescriptor(&temp); 453 return BasicTagFromDescriptor(descriptor); 454} 455 456static JDWP::JdwpTag TagFromClass(const ScopedObjectAccessUnchecked& soa, mirror::Class* c) 457 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 458 CHECK(c != nullptr); 459 if (c->IsArrayClass()) { 460 return JDWP::JT_ARRAY; 461 } 462 if (c->IsStringClass()) { 463 return JDWP::JT_STRING; 464 } 465 if (c->IsClassClass()) { 466 return JDWP::JT_CLASS_OBJECT; 467 } 468 { 469 mirror::Class* thread_class = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread); 470 if (thread_class->IsAssignableFrom(c)) { 471 return JDWP::JT_THREAD; 472 } 473 } 474 { 475 mirror::Class* thread_group_class = 476 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ThreadGroup); 477 if (thread_group_class->IsAssignableFrom(c)) { 478 return JDWP::JT_THREAD_GROUP; 479 } 480 } 481 { 482 mirror::Class* class_loader_class = 483 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ClassLoader); 484 if (class_loader_class->IsAssignableFrom(c)) { 485 return JDWP::JT_CLASS_LOADER; 486 } 487 } 488 return JDWP::JT_OBJECT; 489} 490 491/* 492 * Objects declared to hold Object might actually hold a more specific 493 * type. The debugger may take a special interest in these (e.g. it 494 * wants to display the contents of Strings), so we want to return an 495 * appropriate tag. 496 * 497 * Null objects are tagged JT_OBJECT. 498 */ 499JDWP::JdwpTag Dbg::TagFromObject(const ScopedObjectAccessUnchecked& soa, mirror::Object* o) { 500 return (o == nullptr) ? JDWP::JT_OBJECT : TagFromClass(soa, o->GetClass()); 501} 502 503static bool IsPrimitiveTag(JDWP::JdwpTag tag) { 504 switch (tag) { 505 case JDWP::JT_BOOLEAN: 506 case JDWP::JT_BYTE: 507 case JDWP::JT_CHAR: 508 case JDWP::JT_FLOAT: 509 case JDWP::JT_DOUBLE: 510 case JDWP::JT_INT: 511 case JDWP::JT_LONG: 512 case JDWP::JT_SHORT: 513 case JDWP::JT_VOID: 514 return true; 515 default: 516 return false; 517 } 518} 519 520void Dbg::StartJdwp() { 521 if (!gJdwpAllowed || !IsJdwpConfigured()) { 522 // No JDWP for you! 523 return; 524 } 525 526 CHECK(gRegistry == nullptr); 527 gRegistry = new ObjectRegistry; 528 529 // Init JDWP if the debugger is enabled. This may connect out to a 530 // debugger, passively listen for a debugger, or block waiting for a 531 // debugger. 532 gJdwpState = JDWP::JdwpState::Create(&gJdwpOptions); 533 if (gJdwpState == nullptr) { 534 // We probably failed because some other process has the port already, which means that 535 // if we don't abort the user is likely to think they're talking to us when they're actually 536 // talking to that other process. 537 LOG(FATAL) << "Debugger thread failed to initialize"; 538 } 539 540 // If a debugger has already attached, send the "welcome" message. 541 // This may cause us to suspend all threads. 542 if (gJdwpState->IsActive()) { 543 ScopedObjectAccess soa(Thread::Current()); 544 gJdwpState->PostVMStart(); 545 } 546} 547 548void Dbg::StopJdwp() { 549 // Post VM_DEATH event before the JDWP connection is closed (either by the JDWP thread or the 550 // destruction of gJdwpState). 551 if (gJdwpState != nullptr && gJdwpState->IsActive()) { 552 gJdwpState->PostVMDeath(); 553 } 554 // Prevent the JDWP thread from processing JDWP incoming packets after we close the connection. 555 Dispose(); 556 delete gJdwpState; 557 gJdwpState = nullptr; 558 delete gRegistry; 559 gRegistry = nullptr; 560} 561 562void Dbg::GcDidFinish() { 563 if (gDdmHpifWhen != HPIF_WHEN_NEVER) { 564 ScopedObjectAccess soa(Thread::Current()); 565 VLOG(jdwp) << "Sending heap info to DDM"; 566 DdmSendHeapInfo(gDdmHpifWhen); 567 } 568 if (gDdmHpsgWhen != HPSG_WHEN_NEVER) { 569 ScopedObjectAccess soa(Thread::Current()); 570 VLOG(jdwp) << "Dumping heap to DDM"; 571 DdmSendHeapSegments(false); 572 } 573 if (gDdmNhsgWhen != HPSG_WHEN_NEVER) { 574 ScopedObjectAccess soa(Thread::Current()); 575 VLOG(jdwp) << "Dumping native heap to DDM"; 576 DdmSendHeapSegments(true); 577 } 578} 579 580void Dbg::SetJdwpAllowed(bool allowed) { 581 gJdwpAllowed = allowed; 582} 583 584DebugInvokeReq* Dbg::GetInvokeReq() { 585 return Thread::Current()->GetInvokeReq(); 586} 587 588Thread* Dbg::GetDebugThread() { 589 return (gJdwpState != nullptr) ? gJdwpState->GetDebugThread() : nullptr; 590} 591 592void Dbg::ClearWaitForEventThread() { 593 gJdwpState->ReleaseJdwpTokenForEvent(); 594} 595 596void Dbg::Connected() { 597 CHECK(!gDebuggerConnected); 598 VLOG(jdwp) << "JDWP has attached"; 599 gDebuggerConnected = true; 600 gDisposed = false; 601} 602 603bool Dbg::RequiresDeoptimization() { 604 // We don't need deoptimization if everything runs with interpreter after 605 // enabling -Xint mode. 606 return !Runtime::Current()->GetInstrumentation()->IsForcedInterpretOnly(); 607} 608 609void Dbg::GoActive() { 610 // Enable all debugging features, including scans for breakpoints. 611 // This is a no-op if we're already active. 612 // Only called from the JDWP handler thread. 613 if (IsDebuggerActive()) { 614 return; 615 } 616 617 { 618 // TODO: dalvik only warned if there were breakpoints left over. clear in Dbg::Disconnected? 619 ReaderMutexLock mu(Thread::Current(), *Locks::breakpoint_lock_); 620 CHECK_EQ(gBreakpoints.size(), 0U); 621 } 622 623 { 624 MutexLock mu(Thread::Current(), *Locks::deoptimization_lock_); 625 CHECK_EQ(deoptimization_requests_.size(), 0U); 626 CHECK_EQ(full_deoptimization_event_count_, 0U); 627 CHECK_EQ(dex_pc_change_event_ref_count_, 0U); 628 CHECK_EQ(method_enter_event_ref_count_, 0U); 629 CHECK_EQ(method_exit_event_ref_count_, 0U); 630 CHECK_EQ(field_read_event_ref_count_, 0U); 631 CHECK_EQ(field_write_event_ref_count_, 0U); 632 CHECK_EQ(exception_catch_event_ref_count_, 0U); 633 } 634 635 Runtime* runtime = Runtime::Current(); 636 runtime->GetThreadList()->SuspendAll(__FUNCTION__); 637 Thread* self = Thread::Current(); 638 ThreadState old_state = self->SetStateUnsafe(kRunnable); 639 CHECK_NE(old_state, kRunnable); 640 if (RequiresDeoptimization()) { 641 runtime->GetInstrumentation()->EnableDeoptimization(); 642 } 643 instrumentation_events_ = 0; 644 gDebuggerActive = true; 645 CHECK_EQ(self->SetStateUnsafe(old_state), kRunnable); 646 runtime->GetThreadList()->ResumeAll(); 647 648 LOG(INFO) << "Debugger is active"; 649} 650 651void Dbg::Disconnected() { 652 CHECK(gDebuggerConnected); 653 654 LOG(INFO) << "Debugger is no longer active"; 655 656 // Suspend all threads and exclusively acquire the mutator lock. Set the state of the thread 657 // to kRunnable to avoid scoped object access transitions. Remove the debugger as a listener 658 // and clear the object registry. 659 Runtime* runtime = Runtime::Current(); 660 runtime->GetThreadList()->SuspendAll(__FUNCTION__); 661 Thread* self = Thread::Current(); 662 ThreadState old_state = self->SetStateUnsafe(kRunnable); 663 664 // Debugger may not be active at this point. 665 if (IsDebuggerActive()) { 666 { 667 // Since we're going to disable deoptimization, we clear the deoptimization requests queue. 668 // This prevents us from having any pending deoptimization request when the debugger attaches 669 // to us again while no event has been requested yet. 670 MutexLock mu(Thread::Current(), *Locks::deoptimization_lock_); 671 deoptimization_requests_.clear(); 672 full_deoptimization_event_count_ = 0U; 673 } 674 if (instrumentation_events_ != 0) { 675 runtime->GetInstrumentation()->RemoveListener(&gDebugInstrumentationListener, 676 instrumentation_events_); 677 instrumentation_events_ = 0; 678 } 679 if (RequiresDeoptimization()) { 680 runtime->GetInstrumentation()->DisableDeoptimization(); 681 } 682 gDebuggerActive = false; 683 } 684 CHECK_EQ(self->SetStateUnsafe(old_state), kRunnable); 685 runtime->GetThreadList()->ResumeAll(); 686 687 { 688 ScopedObjectAccess soa(self); 689 gRegistry->Clear(); 690 } 691 692 gDebuggerConnected = false; 693} 694 695void Dbg::ConfigureJdwp(const JDWP::JdwpOptions& jdwp_options) { 696 CHECK_NE(jdwp_options.transport, JDWP::kJdwpTransportUnknown); 697 gJdwpOptions = jdwp_options; 698 gJdwpConfigured = true; 699} 700 701bool Dbg::IsJdwpConfigured() { 702 return gJdwpConfigured; 703} 704 705int64_t Dbg::LastDebuggerActivity() { 706 return gJdwpState->LastDebuggerActivity(); 707} 708 709void Dbg::UndoDebuggerSuspensions() { 710 Runtime::Current()->GetThreadList()->UndoDebuggerSuspensions(); 711} 712 713std::string Dbg::GetClassName(JDWP::RefTypeId class_id) { 714 JDWP::JdwpError error; 715 mirror::Object* o = gRegistry->Get<mirror::Object*>(class_id, &error); 716 if (o == nullptr) { 717 if (error == JDWP::ERR_NONE) { 718 return "null"; 719 } else { 720 return StringPrintf("invalid object %p", reinterpret_cast<void*>(class_id)); 721 } 722 } 723 if (!o->IsClass()) { 724 return StringPrintf("non-class %p", o); // This is only used for debugging output anyway. 725 } 726 return GetClassName(o->AsClass()); 727} 728 729std::string Dbg::GetClassName(mirror::Class* klass) { 730 if (klass == nullptr) { 731 return "null"; 732 } 733 std::string temp; 734 return DescriptorToName(klass->GetDescriptor(&temp)); 735} 736 737JDWP::JdwpError Dbg::GetClassObject(JDWP::RefTypeId id, JDWP::ObjectId* class_object_id) { 738 JDWP::JdwpError status; 739 mirror::Class* c = DecodeClass(id, &status); 740 if (c == nullptr) { 741 *class_object_id = 0; 742 return status; 743 } 744 *class_object_id = gRegistry->Add(c); 745 return JDWP::ERR_NONE; 746} 747 748JDWP::JdwpError Dbg::GetSuperclass(JDWP::RefTypeId id, JDWP::RefTypeId* superclass_id) { 749 JDWP::JdwpError status; 750 mirror::Class* c = DecodeClass(id, &status); 751 if (c == nullptr) { 752 *superclass_id = 0; 753 return status; 754 } 755 if (c->IsInterface()) { 756 // http://code.google.com/p/android/issues/detail?id=20856 757 *superclass_id = 0; 758 } else { 759 *superclass_id = gRegistry->Add(c->GetSuperClass()); 760 } 761 return JDWP::ERR_NONE; 762} 763 764JDWP::JdwpError Dbg::GetClassLoader(JDWP::RefTypeId id, JDWP::ExpandBuf* pReply) { 765 JDWP::JdwpError error; 766 mirror::Object* o = gRegistry->Get<mirror::Object*>(id, &error); 767 if (o == nullptr) { 768 return JDWP::ERR_INVALID_OBJECT; 769 } 770 expandBufAddObjectId(pReply, gRegistry->Add(o->GetClass()->GetClassLoader())); 771 return JDWP::ERR_NONE; 772} 773 774JDWP::JdwpError Dbg::GetModifiers(JDWP::RefTypeId id, JDWP::ExpandBuf* pReply) { 775 JDWP::JdwpError error; 776 mirror::Class* c = DecodeClass(id, &error); 777 if (c == nullptr) { 778 return error; 779 } 780 781 uint32_t access_flags = c->GetAccessFlags() & kAccJavaFlagsMask; 782 783 // Set ACC_SUPER. Dex files don't contain this flag but only classes are supposed to have it set, 784 // not interfaces. 785 // Class.getModifiers doesn't return it, but JDWP does, so we set it here. 786 if ((access_flags & kAccInterface) == 0) { 787 access_flags |= kAccSuper; 788 } 789 790 expandBufAdd4BE(pReply, access_flags); 791 792 return JDWP::ERR_NONE; 793} 794 795JDWP::JdwpError Dbg::GetMonitorInfo(JDWP::ObjectId object_id, JDWP::ExpandBuf* reply) { 796 JDWP::JdwpError error; 797 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id, &error); 798 if (o == nullptr) { 799 return JDWP::ERR_INVALID_OBJECT; 800 } 801 802 // Ensure all threads are suspended while we read objects' lock words. 803 Thread* self = Thread::Current(); 804 CHECK_EQ(self->GetState(), kRunnable); 805 self->TransitionFromRunnableToSuspended(kSuspended); 806 Runtime::Current()->GetThreadList()->SuspendAll(__FUNCTION__); 807 808 MonitorInfo monitor_info(o); 809 810 Runtime::Current()->GetThreadList()->ResumeAll(); 811 self->TransitionFromSuspendedToRunnable(); 812 813 if (monitor_info.owner_ != nullptr) { 814 expandBufAddObjectId(reply, gRegistry->Add(monitor_info.owner_->GetPeer())); 815 } else { 816 expandBufAddObjectId(reply, gRegistry->Add(nullptr)); 817 } 818 expandBufAdd4BE(reply, monitor_info.entry_count_); 819 expandBufAdd4BE(reply, monitor_info.waiters_.size()); 820 for (size_t i = 0; i < monitor_info.waiters_.size(); ++i) { 821 expandBufAddObjectId(reply, gRegistry->Add(monitor_info.waiters_[i]->GetPeer())); 822 } 823 return JDWP::ERR_NONE; 824} 825 826JDWP::JdwpError Dbg::GetOwnedMonitors(JDWP::ObjectId thread_id, 827 std::vector<JDWP::ObjectId>* monitors, 828 std::vector<uint32_t>* stack_depths) { 829 struct OwnedMonitorVisitor : public StackVisitor { 830 OwnedMonitorVisitor(Thread* thread, Context* context, 831 std::vector<JDWP::ObjectId>* monitor_vector, 832 std::vector<uint32_t>* stack_depth_vector) 833 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 834 : StackVisitor(thread, context), current_stack_depth(0), 835 monitors(monitor_vector), stack_depths(stack_depth_vector) {} 836 837 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 838 // annotalysis. 839 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 840 if (!GetMethod()->IsRuntimeMethod()) { 841 Monitor::VisitLocks(this, AppendOwnedMonitors, this); 842 ++current_stack_depth; 843 } 844 return true; 845 } 846 847 static void AppendOwnedMonitors(mirror::Object* owned_monitor, void* arg) 848 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 849 OwnedMonitorVisitor* visitor = reinterpret_cast<OwnedMonitorVisitor*>(arg); 850 visitor->monitors->push_back(gRegistry->Add(owned_monitor)); 851 visitor->stack_depths->push_back(visitor->current_stack_depth); 852 } 853 854 size_t current_stack_depth; 855 std::vector<JDWP::ObjectId>* const monitors; 856 std::vector<uint32_t>* const stack_depths; 857 }; 858 859 ScopedObjectAccessUnchecked soa(Thread::Current()); 860 JDWP::JdwpError error; 861 Thread* thread = DecodeThread(soa, thread_id, &error); 862 if (thread == nullptr) { 863 return error; 864 } 865 if (!IsSuspendedForDebugger(soa, thread)) { 866 return JDWP::ERR_THREAD_NOT_SUSPENDED; 867 } 868 std::unique_ptr<Context> context(Context::Create()); 869 OwnedMonitorVisitor visitor(thread, context.get(), monitors, stack_depths); 870 visitor.WalkStack(); 871 return JDWP::ERR_NONE; 872} 873 874JDWP::JdwpError Dbg::GetContendedMonitor(JDWP::ObjectId thread_id, 875 JDWP::ObjectId* contended_monitor) { 876 ScopedObjectAccessUnchecked soa(Thread::Current()); 877 *contended_monitor = 0; 878 JDWP::JdwpError error; 879 Thread* thread = DecodeThread(soa, thread_id, &error); 880 if (thread == nullptr) { 881 return error; 882 } 883 if (!IsSuspendedForDebugger(soa, thread)) { 884 return JDWP::ERR_THREAD_NOT_SUSPENDED; 885 } 886 mirror::Object* contended_monitor_obj = Monitor::GetContendedMonitor(thread); 887 // Add() requires the thread_list_lock_ not held to avoid the lock 888 // level violation. 889 *contended_monitor = gRegistry->Add(contended_monitor_obj); 890 return JDWP::ERR_NONE; 891} 892 893JDWP::JdwpError Dbg::GetInstanceCounts(const std::vector<JDWP::RefTypeId>& class_ids, 894 std::vector<uint64_t>* counts) { 895 gc::Heap* heap = Runtime::Current()->GetHeap(); 896 heap->CollectGarbage(false); 897 std::vector<mirror::Class*> classes; 898 counts->clear(); 899 for (size_t i = 0; i < class_ids.size(); ++i) { 900 JDWP::JdwpError error; 901 mirror::Class* c = DecodeClass(class_ids[i], &error); 902 if (c == nullptr) { 903 return error; 904 } 905 classes.push_back(c); 906 counts->push_back(0); 907 } 908 heap->CountInstances(classes, false, &(*counts)[0]); 909 return JDWP::ERR_NONE; 910} 911 912JDWP::JdwpError Dbg::GetInstances(JDWP::RefTypeId class_id, int32_t max_count, 913 std::vector<JDWP::ObjectId>* instances) { 914 gc::Heap* heap = Runtime::Current()->GetHeap(); 915 // We only want reachable instances, so do a GC. 916 heap->CollectGarbage(false); 917 JDWP::JdwpError error; 918 mirror::Class* c = DecodeClass(class_id, &error); 919 if (c == nullptr) { 920 return error; 921 } 922 std::vector<mirror::Object*> raw_instances; 923 Runtime::Current()->GetHeap()->GetInstances(c, max_count, raw_instances); 924 for (size_t i = 0; i < raw_instances.size(); ++i) { 925 instances->push_back(gRegistry->Add(raw_instances[i])); 926 } 927 return JDWP::ERR_NONE; 928} 929 930JDWP::JdwpError Dbg::GetReferringObjects(JDWP::ObjectId object_id, int32_t max_count, 931 std::vector<JDWP::ObjectId>* referring_objects) { 932 gc::Heap* heap = Runtime::Current()->GetHeap(); 933 heap->CollectGarbage(false); 934 JDWP::JdwpError error; 935 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id, &error); 936 if (o == nullptr) { 937 return JDWP::ERR_INVALID_OBJECT; 938 } 939 std::vector<mirror::Object*> raw_instances; 940 heap->GetReferringObjects(o, max_count, raw_instances); 941 for (size_t i = 0; i < raw_instances.size(); ++i) { 942 referring_objects->push_back(gRegistry->Add(raw_instances[i])); 943 } 944 return JDWP::ERR_NONE; 945} 946 947JDWP::JdwpError Dbg::DisableCollection(JDWP::ObjectId object_id) { 948 JDWP::JdwpError error; 949 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id, &error); 950 if (o == nullptr) { 951 return JDWP::ERR_INVALID_OBJECT; 952 } 953 gRegistry->DisableCollection(object_id); 954 return JDWP::ERR_NONE; 955} 956 957JDWP::JdwpError Dbg::EnableCollection(JDWP::ObjectId object_id) { 958 JDWP::JdwpError error; 959 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id, &error); 960 // Unlike DisableCollection, JDWP specs do not state an invalid object causes an error. The RI 961 // also ignores these cases and never return an error. However it's not obvious why this command 962 // should behave differently from DisableCollection and IsCollected commands. So let's be more 963 // strict and return an error if this happens. 964 if (o == nullptr) { 965 return JDWP::ERR_INVALID_OBJECT; 966 } 967 gRegistry->EnableCollection(object_id); 968 return JDWP::ERR_NONE; 969} 970 971JDWP::JdwpError Dbg::IsCollected(JDWP::ObjectId object_id, bool* is_collected) { 972 *is_collected = true; 973 if (object_id == 0) { 974 // Null object id is invalid. 975 return JDWP::ERR_INVALID_OBJECT; 976 } 977 // JDWP specs state an INVALID_OBJECT error is returned if the object ID is not valid. However 978 // the RI seems to ignore this and assume object has been collected. 979 JDWP::JdwpError error; 980 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id, &error); 981 if (o != nullptr) { 982 *is_collected = gRegistry->IsCollected(object_id); 983 } 984 return JDWP::ERR_NONE; 985} 986 987void Dbg::DisposeObject(JDWP::ObjectId object_id, uint32_t reference_count) { 988 gRegistry->DisposeObject(object_id, reference_count); 989} 990 991JDWP::JdwpTypeTag Dbg::GetTypeTag(mirror::Class* klass) { 992 DCHECK(klass != nullptr); 993 if (klass->IsArrayClass()) { 994 return JDWP::TT_ARRAY; 995 } else if (klass->IsInterface()) { 996 return JDWP::TT_INTERFACE; 997 } else { 998 return JDWP::TT_CLASS; 999 } 1000} 1001 1002JDWP::JdwpError Dbg::GetReflectedType(JDWP::RefTypeId class_id, JDWP::ExpandBuf* pReply) { 1003 JDWP::JdwpError error; 1004 mirror::Class* c = DecodeClass(class_id, &error); 1005 if (c == nullptr) { 1006 return error; 1007 } 1008 1009 JDWP::JdwpTypeTag type_tag = GetTypeTag(c); 1010 expandBufAdd1(pReply, type_tag); 1011 expandBufAddRefTypeId(pReply, class_id); 1012 return JDWP::ERR_NONE; 1013} 1014 1015void Dbg::GetClassList(std::vector<JDWP::RefTypeId>* classes) { 1016 // Get the complete list of reference classes (i.e. all classes except 1017 // the primitive types). 1018 // Returns a newly-allocated buffer full of RefTypeId values. 1019 struct ClassListCreator { 1020 explicit ClassListCreator(std::vector<JDWP::RefTypeId>* classes_in) : classes(classes_in) { 1021 } 1022 1023 static bool Visit(mirror::Class* c, void* arg) { 1024 return reinterpret_cast<ClassListCreator*>(arg)->Visit(c); 1025 } 1026 1027 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 1028 // annotalysis. 1029 bool Visit(mirror::Class* c) NO_THREAD_SAFETY_ANALYSIS { 1030 if (!c->IsPrimitive()) { 1031 classes->push_back(gRegistry->AddRefType(c)); 1032 } 1033 return true; 1034 } 1035 1036 std::vector<JDWP::RefTypeId>* const classes; 1037 }; 1038 1039 ClassListCreator clc(classes); 1040 Runtime::Current()->GetClassLinker()->VisitClassesWithoutClassesLock(ClassListCreator::Visit, 1041 &clc); 1042} 1043 1044JDWP::JdwpError Dbg::GetClassInfo(JDWP::RefTypeId class_id, JDWP::JdwpTypeTag* pTypeTag, 1045 uint32_t* pStatus, std::string* pDescriptor) { 1046 JDWP::JdwpError error; 1047 mirror::Class* c = DecodeClass(class_id, &error); 1048 if (c == nullptr) { 1049 return error; 1050 } 1051 1052 if (c->IsArrayClass()) { 1053 *pStatus = JDWP::CS_VERIFIED | JDWP::CS_PREPARED; 1054 *pTypeTag = JDWP::TT_ARRAY; 1055 } else { 1056 if (c->IsErroneous()) { 1057 *pStatus = JDWP::CS_ERROR; 1058 } else { 1059 *pStatus = JDWP::CS_VERIFIED | JDWP::CS_PREPARED | JDWP::CS_INITIALIZED; 1060 } 1061 *pTypeTag = c->IsInterface() ? JDWP::TT_INTERFACE : JDWP::TT_CLASS; 1062 } 1063 1064 if (pDescriptor != nullptr) { 1065 std::string temp; 1066 *pDescriptor = c->GetDescriptor(&temp); 1067 } 1068 return JDWP::ERR_NONE; 1069} 1070 1071void Dbg::FindLoadedClassBySignature(const char* descriptor, std::vector<JDWP::RefTypeId>* ids) { 1072 std::vector<mirror::Class*> classes; 1073 Runtime::Current()->GetClassLinker()->LookupClasses(descriptor, classes); 1074 ids->clear(); 1075 for (size_t i = 0; i < classes.size(); ++i) { 1076 ids->push_back(gRegistry->Add(classes[i])); 1077 } 1078} 1079 1080JDWP::JdwpError Dbg::GetReferenceType(JDWP::ObjectId object_id, JDWP::ExpandBuf* pReply) { 1081 JDWP::JdwpError error; 1082 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id, &error); 1083 if (o == nullptr) { 1084 return JDWP::ERR_INVALID_OBJECT; 1085 } 1086 1087 JDWP::JdwpTypeTag type_tag = GetTypeTag(o->GetClass()); 1088 JDWP::RefTypeId type_id = gRegistry->AddRefType(o->GetClass()); 1089 1090 expandBufAdd1(pReply, type_tag); 1091 expandBufAddRefTypeId(pReply, type_id); 1092 1093 return JDWP::ERR_NONE; 1094} 1095 1096JDWP::JdwpError Dbg::GetSignature(JDWP::RefTypeId class_id, std::string* signature) { 1097 JDWP::JdwpError error; 1098 mirror::Class* c = DecodeClass(class_id, &error); 1099 if (c == nullptr) { 1100 return error; 1101 } 1102 std::string temp; 1103 *signature = c->GetDescriptor(&temp); 1104 return JDWP::ERR_NONE; 1105} 1106 1107JDWP::JdwpError Dbg::GetSourceFile(JDWP::RefTypeId class_id, std::string* result) { 1108 JDWP::JdwpError error; 1109 mirror::Class* c = DecodeClass(class_id, &error); 1110 if (c == nullptr) { 1111 return error; 1112 } 1113 const char* source_file = c->GetSourceFile(); 1114 if (source_file == nullptr) { 1115 return JDWP::ERR_ABSENT_INFORMATION; 1116 } 1117 *result = source_file; 1118 return JDWP::ERR_NONE; 1119} 1120 1121JDWP::JdwpError Dbg::GetObjectTag(JDWP::ObjectId object_id, uint8_t* tag) { 1122 ScopedObjectAccessUnchecked soa(Thread::Current()); 1123 JDWP::JdwpError error; 1124 mirror::Object* o = gRegistry->Get<mirror::Object*>(object_id, &error); 1125 if (error != JDWP::ERR_NONE) { 1126 *tag = JDWP::JT_VOID; 1127 return error; 1128 } 1129 *tag = TagFromObject(soa, o); 1130 return JDWP::ERR_NONE; 1131} 1132 1133size_t Dbg::GetTagWidth(JDWP::JdwpTag tag) { 1134 switch (tag) { 1135 case JDWP::JT_VOID: 1136 return 0; 1137 case JDWP::JT_BYTE: 1138 case JDWP::JT_BOOLEAN: 1139 return 1; 1140 case JDWP::JT_CHAR: 1141 case JDWP::JT_SHORT: 1142 return 2; 1143 case JDWP::JT_FLOAT: 1144 case JDWP::JT_INT: 1145 return 4; 1146 case JDWP::JT_ARRAY: 1147 case JDWP::JT_OBJECT: 1148 case JDWP::JT_STRING: 1149 case JDWP::JT_THREAD: 1150 case JDWP::JT_THREAD_GROUP: 1151 case JDWP::JT_CLASS_LOADER: 1152 case JDWP::JT_CLASS_OBJECT: 1153 return sizeof(JDWP::ObjectId); 1154 case JDWP::JT_DOUBLE: 1155 case JDWP::JT_LONG: 1156 return 8; 1157 default: 1158 LOG(FATAL) << "Unknown tag " << tag; 1159 return -1; 1160 } 1161} 1162 1163JDWP::JdwpError Dbg::GetArrayLength(JDWP::ObjectId array_id, int32_t* length) { 1164 JDWP::JdwpError error; 1165 mirror::Array* a = DecodeNonNullArray(array_id, &error); 1166 if (a == nullptr) { 1167 return error; 1168 } 1169 *length = a->GetLength(); 1170 return JDWP::ERR_NONE; 1171} 1172 1173JDWP::JdwpError Dbg::OutputArray(JDWP::ObjectId array_id, int offset, int count, JDWP::ExpandBuf* pReply) { 1174 JDWP::JdwpError error; 1175 mirror::Array* a = DecodeNonNullArray(array_id, &error); 1176 if (a == nullptr) { 1177 return error; 1178 } 1179 1180 if (offset < 0 || count < 0 || offset > a->GetLength() || a->GetLength() - offset < count) { 1181 LOG(WARNING) << __FUNCTION__ << " access out of bounds: offset=" << offset << "; count=" << count; 1182 return JDWP::ERR_INVALID_LENGTH; 1183 } 1184 JDWP::JdwpTag element_tag = BasicTagFromClass(a->GetClass()->GetComponentType()); 1185 expandBufAdd1(pReply, element_tag); 1186 expandBufAdd4BE(pReply, count); 1187 1188 if (IsPrimitiveTag(element_tag)) { 1189 size_t width = GetTagWidth(element_tag); 1190 uint8_t* dst = expandBufAddSpace(pReply, count * width); 1191 if (width == 8) { 1192 const uint64_t* src8 = reinterpret_cast<uint64_t*>(a->GetRawData(sizeof(uint64_t), 0)); 1193 for (int i = 0; i < count; ++i) JDWP::Write8BE(&dst, src8[offset + i]); 1194 } else if (width == 4) { 1195 const uint32_t* src4 = reinterpret_cast<uint32_t*>(a->GetRawData(sizeof(uint32_t), 0)); 1196 for (int i = 0; i < count; ++i) JDWP::Write4BE(&dst, src4[offset + i]); 1197 } else if (width == 2) { 1198 const uint16_t* src2 = reinterpret_cast<uint16_t*>(a->GetRawData(sizeof(uint16_t), 0)); 1199 for (int i = 0; i < count; ++i) JDWP::Write2BE(&dst, src2[offset + i]); 1200 } else { 1201 const uint8_t* src = reinterpret_cast<uint8_t*>(a->GetRawData(sizeof(uint8_t), 0)); 1202 memcpy(dst, &src[offset * width], count * width); 1203 } 1204 } else { 1205 ScopedObjectAccessUnchecked soa(Thread::Current()); 1206 mirror::ObjectArray<mirror::Object>* oa = a->AsObjectArray<mirror::Object>(); 1207 for (int i = 0; i < count; ++i) { 1208 mirror::Object* element = oa->Get(offset + i); 1209 JDWP::JdwpTag specific_tag = (element != nullptr) ? TagFromObject(soa, element) 1210 : element_tag; 1211 expandBufAdd1(pReply, specific_tag); 1212 expandBufAddObjectId(pReply, gRegistry->Add(element)); 1213 } 1214 } 1215 1216 return JDWP::ERR_NONE; 1217} 1218 1219template <typename T> 1220static void CopyArrayData(mirror::Array* a, JDWP::Request* src, int offset, int count) 1221 NO_THREAD_SAFETY_ANALYSIS { 1222 // TODO: fix when annotalysis correctly handles non-member functions. 1223 DCHECK(a->GetClass()->IsPrimitiveArray()); 1224 1225 T* dst = reinterpret_cast<T*>(a->GetRawData(sizeof(T), offset)); 1226 for (int i = 0; i < count; ++i) { 1227 *dst++ = src->ReadValue(sizeof(T)); 1228 } 1229} 1230 1231JDWP::JdwpError Dbg::SetArrayElements(JDWP::ObjectId array_id, int offset, int count, 1232 JDWP::Request* request) { 1233 JDWP::JdwpError error; 1234 mirror::Array* dst = DecodeNonNullArray(array_id, &error); 1235 if (dst == nullptr) { 1236 return error; 1237 } 1238 1239 if (offset < 0 || count < 0 || offset > dst->GetLength() || dst->GetLength() - offset < count) { 1240 LOG(WARNING) << __FUNCTION__ << " access out of bounds: offset=" << offset << "; count=" << count; 1241 return JDWP::ERR_INVALID_LENGTH; 1242 } 1243 JDWP::JdwpTag element_tag = BasicTagFromClass(dst->GetClass()->GetComponentType()); 1244 1245 if (IsPrimitiveTag(element_tag)) { 1246 size_t width = GetTagWidth(element_tag); 1247 if (width == 8) { 1248 CopyArrayData<uint64_t>(dst, request, offset, count); 1249 } else if (width == 4) { 1250 CopyArrayData<uint32_t>(dst, request, offset, count); 1251 } else if (width == 2) { 1252 CopyArrayData<uint16_t>(dst, request, offset, count); 1253 } else { 1254 CopyArrayData<uint8_t>(dst, request, offset, count); 1255 } 1256 } else { 1257 mirror::ObjectArray<mirror::Object>* oa = dst->AsObjectArray<mirror::Object>(); 1258 for (int i = 0; i < count; ++i) { 1259 JDWP::ObjectId id = request->ReadObjectId(); 1260 mirror::Object* o = gRegistry->Get<mirror::Object*>(id, &error); 1261 if (error != JDWP::ERR_NONE) { 1262 return error; 1263 } 1264 oa->Set<false>(offset + i, o); 1265 } 1266 } 1267 1268 return JDWP::ERR_NONE; 1269} 1270 1271JDWP::JdwpError Dbg::CreateString(const std::string& str, JDWP::ObjectId* new_string_id) { 1272 Thread* self = Thread::Current(); 1273 mirror::String* new_string = mirror::String::AllocFromModifiedUtf8(self, str.c_str()); 1274 if (new_string == nullptr) { 1275 DCHECK(self->IsExceptionPending()); 1276 self->ClearException(); 1277 LOG(ERROR) << "Could not allocate string"; 1278 *new_string_id = 0; 1279 return JDWP::ERR_OUT_OF_MEMORY; 1280 } 1281 *new_string_id = gRegistry->Add(new_string); 1282 return JDWP::ERR_NONE; 1283} 1284 1285JDWP::JdwpError Dbg::CreateObject(JDWP::RefTypeId class_id, JDWP::ObjectId* new_object_id) { 1286 JDWP::JdwpError error; 1287 mirror::Class* c = DecodeClass(class_id, &error); 1288 if (c == nullptr) { 1289 *new_object_id = 0; 1290 return error; 1291 } 1292 Thread* self = Thread::Current(); 1293 mirror::Object* new_object = c->AllocObject(self); 1294 if (new_object == nullptr) { 1295 DCHECK(self->IsExceptionPending()); 1296 self->ClearException(); 1297 LOG(ERROR) << "Could not allocate object of type " << PrettyDescriptor(c); 1298 *new_object_id = 0; 1299 return JDWP::ERR_OUT_OF_MEMORY; 1300 } 1301 *new_object_id = gRegistry->Add(new_object); 1302 return JDWP::ERR_NONE; 1303} 1304 1305/* 1306 * Used by Eclipse's "Display" view to evaluate "new byte[5]" to get "(byte[]) [0, 0, 0, 0, 0]". 1307 */ 1308JDWP::JdwpError Dbg::CreateArrayObject(JDWP::RefTypeId array_class_id, uint32_t length, 1309 JDWP::ObjectId* new_array_id) { 1310 JDWP::JdwpError error; 1311 mirror::Class* c = DecodeClass(array_class_id, &error); 1312 if (c == nullptr) { 1313 *new_array_id = 0; 1314 return error; 1315 } 1316 Thread* self = Thread::Current(); 1317 gc::Heap* heap = Runtime::Current()->GetHeap(); 1318 mirror::Array* new_array = mirror::Array::Alloc<true>(self, c, length, 1319 c->GetComponentSizeShift(), 1320 heap->GetCurrentAllocator()); 1321 if (new_array == nullptr) { 1322 DCHECK(self->IsExceptionPending()); 1323 self->ClearException(); 1324 LOG(ERROR) << "Could not allocate array of type " << PrettyDescriptor(c); 1325 *new_array_id = 0; 1326 return JDWP::ERR_OUT_OF_MEMORY; 1327 } 1328 *new_array_id = gRegistry->Add(new_array); 1329 return JDWP::ERR_NONE; 1330} 1331 1332JDWP::FieldId Dbg::ToFieldId(const ArtField* f) { 1333 return static_cast<JDWP::FieldId>(reinterpret_cast<uintptr_t>(f)); 1334} 1335 1336static JDWP::MethodId ToMethodId(const mirror::ArtMethod* m) 1337 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1338 CHECK(!kMovingMethods); 1339 return static_cast<JDWP::MethodId>(reinterpret_cast<uintptr_t>(m)); 1340} 1341 1342static ArtField* FromFieldId(JDWP::FieldId fid) 1343 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1344 return reinterpret_cast<ArtField*>(static_cast<uintptr_t>(fid)); 1345} 1346 1347static mirror::ArtMethod* FromMethodId(JDWP::MethodId mid) 1348 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1349 CHECK(!kMovingMethods); 1350 return reinterpret_cast<mirror::ArtMethod*>(static_cast<uintptr_t>(mid)); 1351} 1352 1353bool Dbg::MatchThread(JDWP::ObjectId expected_thread_id, Thread* event_thread) { 1354 CHECK(event_thread != nullptr); 1355 JDWP::JdwpError error; 1356 mirror::Object* expected_thread_peer = gRegistry->Get<mirror::Object*>(expected_thread_id, 1357 &error); 1358 return expected_thread_peer == event_thread->GetPeer(); 1359} 1360 1361bool Dbg::MatchLocation(const JDWP::JdwpLocation& expected_location, 1362 const JDWP::EventLocation& event_location) { 1363 if (expected_location.dex_pc != event_location.dex_pc) { 1364 return false; 1365 } 1366 mirror::ArtMethod* m = FromMethodId(expected_location.method_id); 1367 return m == event_location.method; 1368} 1369 1370bool Dbg::MatchType(mirror::Class* event_class, JDWP::RefTypeId class_id) { 1371 if (event_class == nullptr) { 1372 return false; 1373 } 1374 JDWP::JdwpError error; 1375 mirror::Class* expected_class = DecodeClass(class_id, &error); 1376 CHECK(expected_class != nullptr); 1377 return expected_class->IsAssignableFrom(event_class); 1378} 1379 1380bool Dbg::MatchField(JDWP::RefTypeId expected_type_id, JDWP::FieldId expected_field_id, 1381 ArtField* event_field) { 1382 ArtField* expected_field = FromFieldId(expected_field_id); 1383 if (expected_field != event_field) { 1384 return false; 1385 } 1386 return Dbg::MatchType(event_field->GetDeclaringClass(), expected_type_id); 1387} 1388 1389bool Dbg::MatchInstance(JDWP::ObjectId expected_instance_id, mirror::Object* event_instance) { 1390 JDWP::JdwpError error; 1391 mirror::Object* modifier_instance = gRegistry->Get<mirror::Object*>(expected_instance_id, &error); 1392 return modifier_instance == event_instance; 1393} 1394 1395void Dbg::SetJdwpLocation(JDWP::JdwpLocation* location, mirror::ArtMethod* m, uint32_t dex_pc) 1396 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 1397 LOCKS_EXCLUDED(Locks::thread_list_lock_, 1398 Locks::thread_suspend_count_lock_) { 1399 if (m == nullptr) { 1400 memset(location, 0, sizeof(*location)); 1401 } else { 1402 mirror::Class* c = m->GetDeclaringClass(); 1403 location->type_tag = GetTypeTag(c); 1404 location->class_id = gRegistry->AddRefType(c); 1405 location->method_id = ToMethodId(m); 1406 location->dex_pc = (m->IsNative() || m->IsProxyMethod()) ? static_cast<uint64_t>(-1) : dex_pc; 1407 } 1408} 1409 1410std::string Dbg::GetMethodName(JDWP::MethodId method_id) { 1411 mirror::ArtMethod* m = FromMethodId(method_id); 1412 if (m == nullptr) { 1413 return "null"; 1414 } 1415 return m->GetName(); 1416} 1417 1418std::string Dbg::GetFieldName(JDWP::FieldId field_id) { 1419 ArtField* f = FromFieldId(field_id); 1420 if (f == nullptr) { 1421 return "null"; 1422 } 1423 return f->GetName(); 1424} 1425 1426/* 1427 * Augment the access flags for synthetic methods and fields by setting 1428 * the (as described by the spec) "0xf0000000 bit". Also, strip out any 1429 * flags not specified by the Java programming language. 1430 */ 1431static uint32_t MangleAccessFlags(uint32_t accessFlags) { 1432 accessFlags &= kAccJavaFlagsMask; 1433 if ((accessFlags & kAccSynthetic) != 0) { 1434 accessFlags |= 0xf0000000; 1435 } 1436 return accessFlags; 1437} 1438 1439/* 1440 * Circularly shifts registers so that arguments come first. Debuggers 1441 * expect slots to begin with arguments, but dex code places them at 1442 * the end. 1443 */ 1444static uint16_t MangleSlot(uint16_t slot, mirror::ArtMethod* m) 1445 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1446 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1447 if (code_item == nullptr) { 1448 // We should not get here for a method without code (native, proxy or abstract). Log it and 1449 // return the slot as is since all registers are arguments. 1450 LOG(WARNING) << "Trying to mangle slot for method without code " << PrettyMethod(m); 1451 return slot; 1452 } 1453 uint16_t ins_size = code_item->ins_size_; 1454 uint16_t locals_size = code_item->registers_size_ - ins_size; 1455 if (slot >= locals_size) { 1456 return slot - locals_size; 1457 } else { 1458 return slot + ins_size; 1459 } 1460} 1461 1462/* 1463 * Circularly shifts registers so that arguments come last. Reverts 1464 * slots to dex style argument placement. 1465 */ 1466static uint16_t DemangleSlot(uint16_t slot, mirror::ArtMethod* m, JDWP::JdwpError* error) 1467 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1468 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1469 if (code_item == nullptr) { 1470 // We should not get here for a method without code (native, proxy or abstract). Log it and 1471 // return the slot as is since all registers are arguments. 1472 LOG(WARNING) << "Trying to demangle slot for method without code " << PrettyMethod(m); 1473 uint16_t vreg_count = mirror::ArtMethod::NumArgRegisters(m->GetShorty()); 1474 if (slot < vreg_count) { 1475 *error = JDWP::ERR_NONE; 1476 return slot; 1477 } 1478 } else { 1479 if (slot < code_item->registers_size_) { 1480 uint16_t ins_size = code_item->ins_size_; 1481 uint16_t locals_size = code_item->registers_size_ - ins_size; 1482 *error = JDWP::ERR_NONE; 1483 return (slot < ins_size) ? slot + locals_size : slot - ins_size; 1484 } 1485 } 1486 1487 // Slot is invalid in the method. 1488 LOG(ERROR) << "Invalid local slot " << slot << " for method " << PrettyMethod(m); 1489 *error = JDWP::ERR_INVALID_SLOT; 1490 return DexFile::kDexNoIndex16; 1491} 1492 1493JDWP::JdwpError Dbg::OutputDeclaredFields(JDWP::RefTypeId class_id, bool with_generic, JDWP::ExpandBuf* pReply) { 1494 JDWP::JdwpError error; 1495 mirror::Class* c = DecodeClass(class_id, &error); 1496 if (c == nullptr) { 1497 return error; 1498 } 1499 1500 size_t instance_field_count = c->NumInstanceFields(); 1501 size_t static_field_count = c->NumStaticFields(); 1502 1503 expandBufAdd4BE(pReply, instance_field_count + static_field_count); 1504 1505 for (size_t i = 0; i < instance_field_count + static_field_count; ++i) { 1506 ArtField* f = (i < instance_field_count) ? c->GetInstanceField(i) : c->GetStaticField(i - instance_field_count); 1507 expandBufAddFieldId(pReply, ToFieldId(f)); 1508 expandBufAddUtf8String(pReply, f->GetName()); 1509 expandBufAddUtf8String(pReply, f->GetTypeDescriptor()); 1510 if (with_generic) { 1511 static const char genericSignature[1] = ""; 1512 expandBufAddUtf8String(pReply, genericSignature); 1513 } 1514 expandBufAdd4BE(pReply, MangleAccessFlags(f->GetAccessFlags())); 1515 } 1516 return JDWP::ERR_NONE; 1517} 1518 1519JDWP::JdwpError Dbg::OutputDeclaredMethods(JDWP::RefTypeId class_id, bool with_generic, 1520 JDWP::ExpandBuf* pReply) { 1521 JDWP::JdwpError error; 1522 mirror::Class* c = DecodeClass(class_id, &error); 1523 if (c == nullptr) { 1524 return error; 1525 } 1526 1527 size_t direct_method_count = c->NumDirectMethods(); 1528 size_t virtual_method_count = c->NumVirtualMethods(); 1529 1530 expandBufAdd4BE(pReply, direct_method_count + virtual_method_count); 1531 1532 for (size_t i = 0; i < direct_method_count + virtual_method_count; ++i) { 1533 mirror::ArtMethod* m = (i < direct_method_count) ? c->GetDirectMethod(i) : c->GetVirtualMethod(i - direct_method_count); 1534 expandBufAddMethodId(pReply, ToMethodId(m)); 1535 expandBufAddUtf8String(pReply, m->GetName()); 1536 expandBufAddUtf8String(pReply, m->GetSignature().ToString()); 1537 if (with_generic) { 1538 static const char genericSignature[1] = ""; 1539 expandBufAddUtf8String(pReply, genericSignature); 1540 } 1541 expandBufAdd4BE(pReply, MangleAccessFlags(m->GetAccessFlags())); 1542 } 1543 return JDWP::ERR_NONE; 1544} 1545 1546JDWP::JdwpError Dbg::OutputDeclaredInterfaces(JDWP::RefTypeId class_id, JDWP::ExpandBuf* pReply) { 1547 JDWP::JdwpError error; 1548 Thread* self = Thread::Current(); 1549 StackHandleScope<1> hs(self); 1550 Handle<mirror::Class> c(hs.NewHandle(DecodeClass(class_id, &error))); 1551 if (c.Get() == nullptr) { 1552 return error; 1553 } 1554 size_t interface_count = c->NumDirectInterfaces(); 1555 expandBufAdd4BE(pReply, interface_count); 1556 for (size_t i = 0; i < interface_count; ++i) { 1557 expandBufAddRefTypeId(pReply, 1558 gRegistry->AddRefType(mirror::Class::GetDirectInterface(self, c, i))); 1559 } 1560 return JDWP::ERR_NONE; 1561} 1562 1563void Dbg::OutputLineTable(JDWP::RefTypeId, JDWP::MethodId method_id, JDWP::ExpandBuf* pReply) { 1564 struct DebugCallbackContext { 1565 int numItems; 1566 JDWP::ExpandBuf* pReply; 1567 1568 static bool Callback(void* context, uint32_t address, uint32_t line_number) { 1569 DebugCallbackContext* pContext = reinterpret_cast<DebugCallbackContext*>(context); 1570 expandBufAdd8BE(pContext->pReply, address); 1571 expandBufAdd4BE(pContext->pReply, line_number); 1572 pContext->numItems++; 1573 return false; 1574 } 1575 }; 1576 mirror::ArtMethod* m = FromMethodId(method_id); 1577 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1578 uint64_t start, end; 1579 if (code_item == nullptr) { 1580 DCHECK(m->IsNative() || m->IsProxyMethod()); 1581 start = -1; 1582 end = -1; 1583 } else { 1584 start = 0; 1585 // Return the index of the last instruction 1586 end = code_item->insns_size_in_code_units_ - 1; 1587 } 1588 1589 expandBufAdd8BE(pReply, start); 1590 expandBufAdd8BE(pReply, end); 1591 1592 // Add numLines later 1593 size_t numLinesOffset = expandBufGetLength(pReply); 1594 expandBufAdd4BE(pReply, 0); 1595 1596 DebugCallbackContext context; 1597 context.numItems = 0; 1598 context.pReply = pReply; 1599 1600 if (code_item != nullptr) { 1601 m->GetDexFile()->DecodeDebugInfo(code_item, m->IsStatic(), m->GetDexMethodIndex(), 1602 DebugCallbackContext::Callback, nullptr, &context); 1603 } 1604 1605 JDWP::Set4BE(expandBufGetBuffer(pReply) + numLinesOffset, context.numItems); 1606} 1607 1608void Dbg::OutputVariableTable(JDWP::RefTypeId, JDWP::MethodId method_id, bool with_generic, 1609 JDWP::ExpandBuf* pReply) { 1610 struct DebugCallbackContext { 1611 mirror::ArtMethod* method; 1612 JDWP::ExpandBuf* pReply; 1613 size_t variable_count; 1614 bool with_generic; 1615 1616 static void Callback(void* context, uint16_t slot, uint32_t startAddress, uint32_t endAddress, 1617 const char* name, const char* descriptor, const char* signature) 1618 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1619 DebugCallbackContext* pContext = reinterpret_cast<DebugCallbackContext*>(context); 1620 1621 VLOG(jdwp) << StringPrintf(" %2zd: %d(%d) '%s' '%s' '%s' actual slot=%d mangled slot=%d", 1622 pContext->variable_count, startAddress, endAddress - startAddress, 1623 name, descriptor, signature, slot, 1624 MangleSlot(slot, pContext->method)); 1625 1626 slot = MangleSlot(slot, pContext->method); 1627 1628 expandBufAdd8BE(pContext->pReply, startAddress); 1629 expandBufAddUtf8String(pContext->pReply, name); 1630 expandBufAddUtf8String(pContext->pReply, descriptor); 1631 if (pContext->with_generic) { 1632 expandBufAddUtf8String(pContext->pReply, signature); 1633 } 1634 expandBufAdd4BE(pContext->pReply, endAddress - startAddress); 1635 expandBufAdd4BE(pContext->pReply, slot); 1636 1637 ++pContext->variable_count; 1638 } 1639 }; 1640 mirror::ArtMethod* m = FromMethodId(method_id); 1641 1642 // arg_count considers doubles and longs to take 2 units. 1643 // variable_count considers everything to take 1 unit. 1644 std::string shorty(m->GetShorty()); 1645 expandBufAdd4BE(pReply, mirror::ArtMethod::NumArgRegisters(shorty)); 1646 1647 // We don't know the total number of variables yet, so leave a blank and update it later. 1648 size_t variable_count_offset = expandBufGetLength(pReply); 1649 expandBufAdd4BE(pReply, 0); 1650 1651 DebugCallbackContext context; 1652 context.method = m; 1653 context.pReply = pReply; 1654 context.variable_count = 0; 1655 context.with_generic = with_generic; 1656 1657 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1658 if (code_item != nullptr) { 1659 m->GetDexFile()->DecodeDebugInfo( 1660 code_item, m->IsStatic(), m->GetDexMethodIndex(), nullptr, DebugCallbackContext::Callback, 1661 &context); 1662 } 1663 1664 JDWP::Set4BE(expandBufGetBuffer(pReply) + variable_count_offset, context.variable_count); 1665} 1666 1667void Dbg::OutputMethodReturnValue(JDWP::MethodId method_id, const JValue* return_value, 1668 JDWP::ExpandBuf* pReply) { 1669 mirror::ArtMethod* m = FromMethodId(method_id); 1670 JDWP::JdwpTag tag = BasicTagFromDescriptor(m->GetShorty()); 1671 OutputJValue(tag, return_value, pReply); 1672} 1673 1674void Dbg::OutputFieldValue(JDWP::FieldId field_id, const JValue* field_value, 1675 JDWP::ExpandBuf* pReply) { 1676 ArtField* f = FromFieldId(field_id); 1677 JDWP::JdwpTag tag = BasicTagFromDescriptor(f->GetTypeDescriptor()); 1678 OutputJValue(tag, field_value, pReply); 1679} 1680 1681JDWP::JdwpError Dbg::GetBytecodes(JDWP::RefTypeId, JDWP::MethodId method_id, 1682 std::vector<uint8_t>* bytecodes) { 1683 mirror::ArtMethod* m = FromMethodId(method_id); 1684 if (m == nullptr) { 1685 return JDWP::ERR_INVALID_METHODID; 1686 } 1687 const DexFile::CodeItem* code_item = m->GetCodeItem(); 1688 size_t byte_count = code_item->insns_size_in_code_units_ * 2; 1689 const uint8_t* begin = reinterpret_cast<const uint8_t*>(code_item->insns_); 1690 const uint8_t* end = begin + byte_count; 1691 for (const uint8_t* p = begin; p != end; ++p) { 1692 bytecodes->push_back(*p); 1693 } 1694 return JDWP::ERR_NONE; 1695} 1696 1697JDWP::JdwpTag Dbg::GetFieldBasicTag(JDWP::FieldId field_id) { 1698 return BasicTagFromDescriptor(FromFieldId(field_id)->GetTypeDescriptor()); 1699} 1700 1701JDWP::JdwpTag Dbg::GetStaticFieldBasicTag(JDWP::FieldId field_id) { 1702 return BasicTagFromDescriptor(FromFieldId(field_id)->GetTypeDescriptor()); 1703} 1704 1705static JDWP::JdwpError GetFieldValueImpl(JDWP::RefTypeId ref_type_id, JDWP::ObjectId object_id, 1706 JDWP::FieldId field_id, JDWP::ExpandBuf* pReply, 1707 bool is_static) 1708 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1709 JDWP::JdwpError error; 1710 mirror::Class* c = DecodeClass(ref_type_id, &error); 1711 if (ref_type_id != 0 && c == nullptr) { 1712 return error; 1713 } 1714 1715 mirror::Object* o = Dbg::GetObjectRegistry()->Get<mirror::Object*>(object_id, &error); 1716 if ((!is_static && o == nullptr) || error != JDWP::ERR_NONE) { 1717 return JDWP::ERR_INVALID_OBJECT; 1718 } 1719 ArtField* f = FromFieldId(field_id); 1720 1721 mirror::Class* receiver_class = c; 1722 if (receiver_class == nullptr && o != nullptr) { 1723 receiver_class = o->GetClass(); 1724 } 1725 // TODO: should we give up now if receiver_class is null? 1726 if (receiver_class != nullptr && !f->GetDeclaringClass()->IsAssignableFrom(receiver_class)) { 1727 LOG(INFO) << "ERR_INVALID_FIELDID: " << PrettyField(f) << " " << PrettyClass(receiver_class); 1728 return JDWP::ERR_INVALID_FIELDID; 1729 } 1730 1731 // The RI only enforces the static/non-static mismatch in one direction. 1732 // TODO: should we change the tests and check both? 1733 if (is_static) { 1734 if (!f->IsStatic()) { 1735 return JDWP::ERR_INVALID_FIELDID; 1736 } 1737 } else { 1738 if (f->IsStatic()) { 1739 LOG(WARNING) << "Ignoring non-nullptr receiver for ObjectReference.SetValues on static field " 1740 << PrettyField(f); 1741 } 1742 } 1743 if (f->IsStatic()) { 1744 o = f->GetDeclaringClass(); 1745 } 1746 1747 JDWP::JdwpTag tag = BasicTagFromDescriptor(f->GetTypeDescriptor()); 1748 JValue field_value; 1749 if (tag == JDWP::JT_VOID) { 1750 LOG(FATAL) << "Unknown tag: " << tag; 1751 } else if (!IsPrimitiveTag(tag)) { 1752 field_value.SetL(f->GetObject(o)); 1753 } else if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) { 1754 field_value.SetJ(f->Get64(o)); 1755 } else { 1756 field_value.SetI(f->Get32(o)); 1757 } 1758 Dbg::OutputJValue(tag, &field_value, pReply); 1759 1760 return JDWP::ERR_NONE; 1761} 1762 1763JDWP::JdwpError Dbg::GetFieldValue(JDWP::ObjectId object_id, JDWP::FieldId field_id, 1764 JDWP::ExpandBuf* pReply) { 1765 return GetFieldValueImpl(0, object_id, field_id, pReply, false); 1766} 1767 1768JDWP::JdwpError Dbg::GetStaticFieldValue(JDWP::RefTypeId ref_type_id, JDWP::FieldId field_id, 1769 JDWP::ExpandBuf* pReply) { 1770 return GetFieldValueImpl(ref_type_id, 0, field_id, pReply, true); 1771} 1772 1773static JDWP::JdwpError SetFieldValueImpl(JDWP::ObjectId object_id, JDWP::FieldId field_id, 1774 uint64_t value, int width, bool is_static) 1775 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1776 JDWP::JdwpError error; 1777 mirror::Object* o = Dbg::GetObjectRegistry()->Get<mirror::Object*>(object_id, &error); 1778 if ((!is_static && o == nullptr) || error != JDWP::ERR_NONE) { 1779 return JDWP::ERR_INVALID_OBJECT; 1780 } 1781 ArtField* f = FromFieldId(field_id); 1782 1783 // The RI only enforces the static/non-static mismatch in one direction. 1784 // TODO: should we change the tests and check both? 1785 if (is_static) { 1786 if (!f->IsStatic()) { 1787 return JDWP::ERR_INVALID_FIELDID; 1788 } 1789 } else { 1790 if (f->IsStatic()) { 1791 LOG(WARNING) << "Ignoring non-nullptr receiver for ObjectReference.SetValues on static field " << PrettyField(f); 1792 } 1793 } 1794 if (f->IsStatic()) { 1795 o = f->GetDeclaringClass(); 1796 } 1797 1798 JDWP::JdwpTag tag = BasicTagFromDescriptor(f->GetTypeDescriptor()); 1799 1800 if (IsPrimitiveTag(tag)) { 1801 if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) { 1802 CHECK_EQ(width, 8); 1803 // Debugging can't use transactional mode (runtime only). 1804 f->Set64<false>(o, value); 1805 } else { 1806 CHECK_LE(width, 4); 1807 // Debugging can't use transactional mode (runtime only). 1808 f->Set32<false>(o, value); 1809 } 1810 } else { 1811 mirror::Object* v = Dbg::GetObjectRegistry()->Get<mirror::Object*>(value, &error); 1812 if (error != JDWP::ERR_NONE) { 1813 return JDWP::ERR_INVALID_OBJECT; 1814 } 1815 if (v != nullptr) { 1816 mirror::Class* field_type; 1817 { 1818 StackHandleScope<2> hs(Thread::Current()); 1819 HandleWrapper<mirror::Object> h_v(hs.NewHandleWrapper(&v)); 1820 HandleWrapper<mirror::Object> h_o(hs.NewHandleWrapper(&o)); 1821 field_type = f->GetType<true>(); 1822 } 1823 if (!field_type->IsAssignableFrom(v->GetClass())) { 1824 return JDWP::ERR_INVALID_OBJECT; 1825 } 1826 } 1827 // Debugging can't use transactional mode (runtime only). 1828 f->SetObject<false>(o, v); 1829 } 1830 1831 return JDWP::ERR_NONE; 1832} 1833 1834JDWP::JdwpError Dbg::SetFieldValue(JDWP::ObjectId object_id, JDWP::FieldId field_id, uint64_t value, 1835 int width) { 1836 return SetFieldValueImpl(object_id, field_id, value, width, false); 1837} 1838 1839JDWP::JdwpError Dbg::SetStaticFieldValue(JDWP::FieldId field_id, uint64_t value, int width) { 1840 return SetFieldValueImpl(0, field_id, value, width, true); 1841} 1842 1843JDWP::JdwpError Dbg::StringToUtf8(JDWP::ObjectId string_id, std::string* str) { 1844 JDWP::JdwpError error; 1845 mirror::Object* obj = gRegistry->Get<mirror::Object*>(string_id, &error); 1846 if (error != JDWP::ERR_NONE) { 1847 return error; 1848 } 1849 if (obj == nullptr) { 1850 return JDWP::ERR_INVALID_OBJECT; 1851 } 1852 { 1853 ScopedObjectAccessUnchecked soa(Thread::Current()); 1854 mirror::Class* java_lang_String = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_String); 1855 if (!java_lang_String->IsAssignableFrom(obj->GetClass())) { 1856 // This isn't a string. 1857 return JDWP::ERR_INVALID_STRING; 1858 } 1859 } 1860 *str = obj->AsString()->ToModifiedUtf8(); 1861 return JDWP::ERR_NONE; 1862} 1863 1864void Dbg::OutputJValue(JDWP::JdwpTag tag, const JValue* return_value, JDWP::ExpandBuf* pReply) { 1865 if (IsPrimitiveTag(tag)) { 1866 expandBufAdd1(pReply, tag); 1867 if (tag == JDWP::JT_BOOLEAN || tag == JDWP::JT_BYTE) { 1868 expandBufAdd1(pReply, return_value->GetI()); 1869 } else if (tag == JDWP::JT_CHAR || tag == JDWP::JT_SHORT) { 1870 expandBufAdd2BE(pReply, return_value->GetI()); 1871 } else if (tag == JDWP::JT_FLOAT || tag == JDWP::JT_INT) { 1872 expandBufAdd4BE(pReply, return_value->GetI()); 1873 } else if (tag == JDWP::JT_DOUBLE || tag == JDWP::JT_LONG) { 1874 expandBufAdd8BE(pReply, return_value->GetJ()); 1875 } else { 1876 CHECK_EQ(tag, JDWP::JT_VOID); 1877 } 1878 } else { 1879 ScopedObjectAccessUnchecked soa(Thread::Current()); 1880 mirror::Object* value = return_value->GetL(); 1881 expandBufAdd1(pReply, TagFromObject(soa, value)); 1882 expandBufAddObjectId(pReply, gRegistry->Add(value)); 1883 } 1884} 1885 1886JDWP::JdwpError Dbg::GetThreadName(JDWP::ObjectId thread_id, std::string* name) { 1887 ScopedObjectAccessUnchecked soa(Thread::Current()); 1888 JDWP::JdwpError error; 1889 Thread* thread = DecodeThread(soa, thread_id, &error); 1890 UNUSED(thread); 1891 if (error != JDWP::ERR_NONE && error != JDWP::ERR_THREAD_NOT_ALIVE) { 1892 return error; 1893 } 1894 1895 // We still need to report the zombie threads' names, so we can't just call Thread::GetThreadName. 1896 mirror::Object* thread_object = gRegistry->Get<mirror::Object*>(thread_id, &error); 1897 CHECK(thread_object != nullptr) << error; 1898 ArtField* java_lang_Thread_name_field = 1899 soa.DecodeField(WellKnownClasses::java_lang_Thread_name); 1900 mirror::String* s = 1901 reinterpret_cast<mirror::String*>(java_lang_Thread_name_field->GetObject(thread_object)); 1902 if (s != nullptr) { 1903 *name = s->ToModifiedUtf8(); 1904 } 1905 return JDWP::ERR_NONE; 1906} 1907 1908JDWP::JdwpError Dbg::GetThreadGroup(JDWP::ObjectId thread_id, JDWP::ExpandBuf* pReply) { 1909 ScopedObjectAccessUnchecked soa(Thread::Current()); 1910 JDWP::JdwpError error; 1911 mirror::Object* thread_object = gRegistry->Get<mirror::Object*>(thread_id, &error); 1912 if (error != JDWP::ERR_NONE) { 1913 return JDWP::ERR_INVALID_OBJECT; 1914 } 1915 ScopedAssertNoThreadSuspension ants(soa.Self(), "Debugger: GetThreadGroup"); 1916 // Okay, so it's an object, but is it actually a thread? 1917 Thread* thread = DecodeThread(soa, thread_id, &error); 1918 UNUSED(thread); 1919 if (error == JDWP::ERR_THREAD_NOT_ALIVE) { 1920 // Zombie threads are in the null group. 1921 expandBufAddObjectId(pReply, JDWP::ObjectId(0)); 1922 error = JDWP::ERR_NONE; 1923 } else if (error == JDWP::ERR_NONE) { 1924 mirror::Class* c = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_Thread); 1925 CHECK(c != nullptr); 1926 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_Thread_group); 1927 CHECK(f != nullptr); 1928 mirror::Object* group = f->GetObject(thread_object); 1929 CHECK(group != nullptr); 1930 JDWP::ObjectId thread_group_id = gRegistry->Add(group); 1931 expandBufAddObjectId(pReply, thread_group_id); 1932 } 1933 return error; 1934} 1935 1936static mirror::Object* DecodeThreadGroup(ScopedObjectAccessUnchecked& soa, 1937 JDWP::ObjectId thread_group_id, JDWP::JdwpError* error) 1938 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1939 mirror::Object* thread_group = Dbg::GetObjectRegistry()->Get<mirror::Object*>(thread_group_id, 1940 error); 1941 if (*error != JDWP::ERR_NONE) { 1942 return nullptr; 1943 } 1944 if (thread_group == nullptr) { 1945 *error = JDWP::ERR_INVALID_OBJECT; 1946 return nullptr; 1947 } 1948 mirror::Class* c = soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_ThreadGroup); 1949 CHECK(c != nullptr); 1950 if (!c->IsAssignableFrom(thread_group->GetClass())) { 1951 // This is not a java.lang.ThreadGroup. 1952 *error = JDWP::ERR_INVALID_THREAD_GROUP; 1953 return nullptr; 1954 } 1955 *error = JDWP::ERR_NONE; 1956 return thread_group; 1957} 1958 1959JDWP::JdwpError Dbg::GetThreadGroupName(JDWP::ObjectId thread_group_id, JDWP::ExpandBuf* pReply) { 1960 ScopedObjectAccessUnchecked soa(Thread::Current()); 1961 JDWP::JdwpError error; 1962 mirror::Object* thread_group = DecodeThreadGroup(soa, thread_group_id, &error); 1963 if (error != JDWP::ERR_NONE) { 1964 return error; 1965 } 1966 ScopedAssertNoThreadSuspension ants(soa.Self(), "Debugger: GetThreadGroupName"); 1967 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_name); 1968 CHECK(f != nullptr); 1969 mirror::String* s = reinterpret_cast<mirror::String*>(f->GetObject(thread_group)); 1970 1971 std::string thread_group_name(s->ToModifiedUtf8()); 1972 expandBufAddUtf8String(pReply, thread_group_name); 1973 return JDWP::ERR_NONE; 1974} 1975 1976JDWP::JdwpError Dbg::GetThreadGroupParent(JDWP::ObjectId thread_group_id, JDWP::ExpandBuf* pReply) { 1977 ScopedObjectAccessUnchecked soa(Thread::Current()); 1978 JDWP::JdwpError error; 1979 mirror::Object* thread_group = DecodeThreadGroup(soa, thread_group_id, &error); 1980 if (error != JDWP::ERR_NONE) { 1981 return error; 1982 } 1983 mirror::Object* parent; 1984 { 1985 ScopedAssertNoThreadSuspension ants(soa.Self(), "Debugger: GetThreadGroupParent"); 1986 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_parent); 1987 CHECK(f != nullptr); 1988 parent = f->GetObject(thread_group); 1989 } 1990 JDWP::ObjectId parent_group_id = gRegistry->Add(parent); 1991 expandBufAddObjectId(pReply, parent_group_id); 1992 return JDWP::ERR_NONE; 1993} 1994 1995static void GetChildThreadGroups(ScopedObjectAccessUnchecked& soa, mirror::Object* thread_group, 1996 std::vector<JDWP::ObjectId>* child_thread_group_ids) 1997 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1998 CHECK(thread_group != nullptr); 1999 2000 // Get the ArrayList<ThreadGroup> "groups" out of this thread group... 2001 ArtField* groups_field = soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_groups); 2002 mirror::Object* groups_array_list = groups_field->GetObject(thread_group); 2003 { 2004 // The "groups" field is declared as a java.util.List: check it really is 2005 // an instance of java.util.ArrayList. 2006 CHECK(groups_array_list != nullptr); 2007 mirror::Class* java_util_ArrayList_class = 2008 soa.Decode<mirror::Class*>(WellKnownClasses::java_util_ArrayList); 2009 CHECK(groups_array_list->InstanceOf(java_util_ArrayList_class)); 2010 } 2011 2012 // Get the array and size out of the ArrayList<ThreadGroup>... 2013 ArtField* array_field = soa.DecodeField(WellKnownClasses::java_util_ArrayList_array); 2014 ArtField* size_field = soa.DecodeField(WellKnownClasses::java_util_ArrayList_size); 2015 mirror::ObjectArray<mirror::Object>* groups_array = 2016 array_field->GetObject(groups_array_list)->AsObjectArray<mirror::Object>(); 2017 const int32_t size = size_field->GetInt(groups_array_list); 2018 2019 // Copy the first 'size' elements out of the array into the result. 2020 ObjectRegistry* registry = Dbg::GetObjectRegistry(); 2021 for (int32_t i = 0; i < size; ++i) { 2022 child_thread_group_ids->push_back(registry->Add(groups_array->Get(i))); 2023 } 2024} 2025 2026JDWP::JdwpError Dbg::GetThreadGroupChildren(JDWP::ObjectId thread_group_id, 2027 JDWP::ExpandBuf* pReply) { 2028 ScopedObjectAccessUnchecked soa(Thread::Current()); 2029 JDWP::JdwpError error; 2030 mirror::Object* thread_group = DecodeThreadGroup(soa, thread_group_id, &error); 2031 if (error != JDWP::ERR_NONE) { 2032 return error; 2033 } 2034 2035 // Add child threads. 2036 { 2037 std::vector<JDWP::ObjectId> child_thread_ids; 2038 GetThreads(thread_group, &child_thread_ids); 2039 expandBufAdd4BE(pReply, child_thread_ids.size()); 2040 for (JDWP::ObjectId child_thread_id : child_thread_ids) { 2041 expandBufAddObjectId(pReply, child_thread_id); 2042 } 2043 } 2044 2045 // Add child thread groups. 2046 { 2047 std::vector<JDWP::ObjectId> child_thread_groups_ids; 2048 GetChildThreadGroups(soa, thread_group, &child_thread_groups_ids); 2049 expandBufAdd4BE(pReply, child_thread_groups_ids.size()); 2050 for (JDWP::ObjectId child_thread_group_id : child_thread_groups_ids) { 2051 expandBufAddObjectId(pReply, child_thread_group_id); 2052 } 2053 } 2054 2055 return JDWP::ERR_NONE; 2056} 2057 2058JDWP::ObjectId Dbg::GetSystemThreadGroupId() { 2059 ScopedObjectAccessUnchecked soa(Thread::Current()); 2060 ArtField* f = soa.DecodeField(WellKnownClasses::java_lang_ThreadGroup_systemThreadGroup); 2061 mirror::Object* group = f->GetObject(f->GetDeclaringClass()); 2062 return gRegistry->Add(group); 2063} 2064 2065JDWP::JdwpThreadStatus Dbg::ToJdwpThreadStatus(ThreadState state) { 2066 switch (state) { 2067 case kBlocked: 2068 return JDWP::TS_MONITOR; 2069 case kNative: 2070 case kRunnable: 2071 case kSuspended: 2072 return JDWP::TS_RUNNING; 2073 case kSleeping: 2074 return JDWP::TS_SLEEPING; 2075 case kStarting: 2076 case kTerminated: 2077 return JDWP::TS_ZOMBIE; 2078 case kTimedWaiting: 2079 case kWaitingForCheckPointsToRun: 2080 case kWaitingForDebuggerSend: 2081 case kWaitingForDebuggerSuspension: 2082 case kWaitingForDebuggerToAttach: 2083 case kWaitingForDeoptimization: 2084 case kWaitingForGcToComplete: 2085 case kWaitingForJniOnLoad: 2086 case kWaitingForMethodTracingStart: 2087 case kWaitingForSignalCatcherOutput: 2088 case kWaitingForVisitObjects: 2089 case kWaitingInMainDebuggerLoop: 2090 case kWaitingInMainSignalCatcherLoop: 2091 case kWaitingPerformingGc: 2092 case kWaiting: 2093 return JDWP::TS_WAIT; 2094 // Don't add a 'default' here so the compiler can spot incompatible enum changes. 2095 } 2096 LOG(FATAL) << "Unknown thread state: " << state; 2097 return JDWP::TS_ZOMBIE; 2098} 2099 2100JDWP::JdwpError Dbg::GetThreadStatus(JDWP::ObjectId thread_id, JDWP::JdwpThreadStatus* pThreadStatus, 2101 JDWP::JdwpSuspendStatus* pSuspendStatus) { 2102 ScopedObjectAccess soa(Thread::Current()); 2103 2104 *pSuspendStatus = JDWP::SUSPEND_STATUS_NOT_SUSPENDED; 2105 2106 JDWP::JdwpError error; 2107 Thread* thread = DecodeThread(soa, thread_id, &error); 2108 if (error != JDWP::ERR_NONE) { 2109 if (error == JDWP::ERR_THREAD_NOT_ALIVE) { 2110 *pThreadStatus = JDWP::TS_ZOMBIE; 2111 return JDWP::ERR_NONE; 2112 } 2113 return error; 2114 } 2115 2116 if (IsSuspendedForDebugger(soa, thread)) { 2117 *pSuspendStatus = JDWP::SUSPEND_STATUS_SUSPENDED; 2118 } 2119 2120 *pThreadStatus = ToJdwpThreadStatus(thread->GetState()); 2121 return JDWP::ERR_NONE; 2122} 2123 2124JDWP::JdwpError Dbg::GetThreadDebugSuspendCount(JDWP::ObjectId thread_id, JDWP::ExpandBuf* pReply) { 2125 ScopedObjectAccess soa(Thread::Current()); 2126 JDWP::JdwpError error; 2127 Thread* thread = DecodeThread(soa, thread_id, &error); 2128 if (error != JDWP::ERR_NONE) { 2129 return error; 2130 } 2131 MutexLock mu2(soa.Self(), *Locks::thread_suspend_count_lock_); 2132 expandBufAdd4BE(pReply, thread->GetDebugSuspendCount()); 2133 return JDWP::ERR_NONE; 2134} 2135 2136JDWP::JdwpError Dbg::Interrupt(JDWP::ObjectId thread_id) { 2137 ScopedObjectAccess soa(Thread::Current()); 2138 JDWP::JdwpError error; 2139 Thread* thread = DecodeThread(soa, thread_id, &error); 2140 if (error != JDWP::ERR_NONE) { 2141 return error; 2142 } 2143 thread->Interrupt(soa.Self()); 2144 return JDWP::ERR_NONE; 2145} 2146 2147static bool IsInDesiredThreadGroup(ScopedObjectAccessUnchecked& soa, 2148 mirror::Object* desired_thread_group, mirror::Object* peer) 2149 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2150 // Do we want threads from all thread groups? 2151 if (desired_thread_group == nullptr) { 2152 return true; 2153 } 2154 ArtField* thread_group_field = soa.DecodeField(WellKnownClasses::java_lang_Thread_group); 2155 DCHECK(thread_group_field != nullptr); 2156 mirror::Object* group = thread_group_field->GetObject(peer); 2157 return (group == desired_thread_group); 2158} 2159 2160void Dbg::GetThreads(mirror::Object* thread_group, std::vector<JDWP::ObjectId>* thread_ids) { 2161 ScopedObjectAccessUnchecked soa(Thread::Current()); 2162 std::list<Thread*> all_threads_list; 2163 { 2164 MutexLock mu(Thread::Current(), *Locks::thread_list_lock_); 2165 all_threads_list = Runtime::Current()->GetThreadList()->GetList(); 2166 } 2167 for (Thread* t : all_threads_list) { 2168 if (t == Dbg::GetDebugThread()) { 2169 // Skip the JDWP thread. Some debuggers get bent out of shape when they can't suspend and 2170 // query all threads, so it's easier if we just don't tell them about this thread. 2171 continue; 2172 } 2173 if (t->IsStillStarting()) { 2174 // This thread is being started (and has been registered in the thread list). However, it is 2175 // not completely started yet so we must ignore it. 2176 continue; 2177 } 2178 mirror::Object* peer = t->GetPeer(); 2179 if (peer == nullptr) { 2180 // peer might be null if the thread is still starting up. We can't tell the debugger about 2181 // this thread yet. 2182 // TODO: if we identified threads to the debugger by their Thread* 2183 // rather than their peer's mirror::Object*, we could fix this. 2184 // Doing so might help us report ZOMBIE threads too. 2185 continue; 2186 } 2187 if (IsInDesiredThreadGroup(soa, thread_group, peer)) { 2188 thread_ids->push_back(gRegistry->Add(peer)); 2189 } 2190 } 2191} 2192 2193static int GetStackDepth(Thread* thread) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2194 struct CountStackDepthVisitor : public StackVisitor { 2195 explicit CountStackDepthVisitor(Thread* thread_in) 2196 : StackVisitor(thread_in, nullptr), depth(0) {} 2197 2198 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 2199 // annotalysis. 2200 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 2201 if (!GetMethod()->IsRuntimeMethod()) { 2202 ++depth; 2203 } 2204 return true; 2205 } 2206 size_t depth; 2207 }; 2208 2209 CountStackDepthVisitor visitor(thread); 2210 visitor.WalkStack(); 2211 return visitor.depth; 2212} 2213 2214JDWP::JdwpError Dbg::GetThreadFrameCount(JDWP::ObjectId thread_id, size_t* result) { 2215 ScopedObjectAccess soa(Thread::Current()); 2216 JDWP::JdwpError error; 2217 *result = 0; 2218 Thread* thread = DecodeThread(soa, thread_id, &error); 2219 if (error != JDWP::ERR_NONE) { 2220 return error; 2221 } 2222 if (!IsSuspendedForDebugger(soa, thread)) { 2223 return JDWP::ERR_THREAD_NOT_SUSPENDED; 2224 } 2225 *result = GetStackDepth(thread); 2226 return JDWP::ERR_NONE; 2227} 2228 2229JDWP::JdwpError Dbg::GetThreadFrames(JDWP::ObjectId thread_id, size_t start_frame, 2230 size_t frame_count, JDWP::ExpandBuf* buf) { 2231 class GetFrameVisitor : public StackVisitor { 2232 public: 2233 GetFrameVisitor(Thread* thread, size_t start_frame_in, size_t frame_count_in, 2234 JDWP::ExpandBuf* buf_in) 2235 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2236 : StackVisitor(thread, nullptr), depth_(0), 2237 start_frame_(start_frame_in), frame_count_(frame_count_in), buf_(buf_in) { 2238 expandBufAdd4BE(buf_, frame_count_); 2239 } 2240 2241 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2242 if (GetMethod()->IsRuntimeMethod()) { 2243 return true; // The debugger can't do anything useful with a frame that has no Method*. 2244 } 2245 if (depth_ >= start_frame_ + frame_count_) { 2246 return false; 2247 } 2248 if (depth_ >= start_frame_) { 2249 JDWP::FrameId frame_id(GetFrameId()); 2250 JDWP::JdwpLocation location; 2251 SetJdwpLocation(&location, GetMethod(), GetDexPc()); 2252 VLOG(jdwp) << StringPrintf(" Frame %3zd: id=%3" PRIu64 " ", depth_, frame_id) << location; 2253 expandBufAdd8BE(buf_, frame_id); 2254 expandBufAddLocation(buf_, location); 2255 } 2256 ++depth_; 2257 return true; 2258 } 2259 2260 private: 2261 size_t depth_; 2262 const size_t start_frame_; 2263 const size_t frame_count_; 2264 JDWP::ExpandBuf* buf_; 2265 }; 2266 2267 ScopedObjectAccessUnchecked soa(Thread::Current()); 2268 JDWP::JdwpError error; 2269 Thread* thread = DecodeThread(soa, thread_id, &error); 2270 if (error != JDWP::ERR_NONE) { 2271 return error; 2272 } 2273 if (!IsSuspendedForDebugger(soa, thread)) { 2274 return JDWP::ERR_THREAD_NOT_SUSPENDED; 2275 } 2276 GetFrameVisitor visitor(thread, start_frame, frame_count, buf); 2277 visitor.WalkStack(); 2278 return JDWP::ERR_NONE; 2279} 2280 2281JDWP::ObjectId Dbg::GetThreadSelfId() { 2282 return GetThreadId(Thread::Current()); 2283} 2284 2285JDWP::ObjectId Dbg::GetThreadId(Thread* thread) { 2286 ScopedObjectAccessUnchecked soa(Thread::Current()); 2287 return gRegistry->Add(thread->GetPeer()); 2288} 2289 2290void Dbg::SuspendVM() { 2291 Runtime::Current()->GetThreadList()->SuspendAllForDebugger(); 2292} 2293 2294void Dbg::ResumeVM() { 2295 Runtime::Current()->GetThreadList()->ResumeAllForDebugger(); 2296} 2297 2298JDWP::JdwpError Dbg::SuspendThread(JDWP::ObjectId thread_id, bool request_suspension) { 2299 Thread* self = Thread::Current(); 2300 ScopedLocalRef<jobject> peer(self->GetJniEnv(), nullptr); 2301 { 2302 ScopedObjectAccess soa(self); 2303 JDWP::JdwpError error; 2304 peer.reset(soa.AddLocalReference<jobject>(gRegistry->Get<mirror::Object*>(thread_id, &error))); 2305 } 2306 if (peer.get() == nullptr) { 2307 return JDWP::ERR_THREAD_NOT_ALIVE; 2308 } 2309 // Suspend thread to build stack trace. 2310 bool timed_out; 2311 ThreadList* thread_list = Runtime::Current()->GetThreadList(); 2312 Thread* thread = thread_list->SuspendThreadByPeer(peer.get(), request_suspension, true, 2313 &timed_out); 2314 if (thread != nullptr) { 2315 return JDWP::ERR_NONE; 2316 } else if (timed_out) { 2317 return JDWP::ERR_INTERNAL; 2318 } else { 2319 return JDWP::ERR_THREAD_NOT_ALIVE; 2320 } 2321} 2322 2323void Dbg::ResumeThread(JDWP::ObjectId thread_id) { 2324 ScopedObjectAccessUnchecked soa(Thread::Current()); 2325 JDWP::JdwpError error; 2326 mirror::Object* peer = gRegistry->Get<mirror::Object*>(thread_id, &error); 2327 CHECK(peer != nullptr) << error; 2328 Thread* thread; 2329 { 2330 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 2331 thread = Thread::FromManagedThread(soa, peer); 2332 } 2333 if (thread == nullptr) { 2334 LOG(WARNING) << "No such thread for resume: " << peer; 2335 return; 2336 } 2337 bool needs_resume; 2338 { 2339 MutexLock mu2(soa.Self(), *Locks::thread_suspend_count_lock_); 2340 needs_resume = thread->GetSuspendCount() > 0; 2341 } 2342 if (needs_resume) { 2343 Runtime::Current()->GetThreadList()->Resume(thread, true); 2344 } 2345} 2346 2347void Dbg::SuspendSelf() { 2348 Runtime::Current()->GetThreadList()->SuspendSelfForDebugger(); 2349} 2350 2351struct GetThisVisitor : public StackVisitor { 2352 GetThisVisitor(Thread* thread, Context* context, JDWP::FrameId frame_id_in) 2353 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2354 : StackVisitor(thread, context), this_object(nullptr), frame_id(frame_id_in) {} 2355 2356 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 2357 // annotalysis. 2358 virtual bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 2359 if (frame_id != GetFrameId()) { 2360 return true; // continue 2361 } else { 2362 this_object = GetThisObject(); 2363 return false; 2364 } 2365 } 2366 2367 mirror::Object* this_object; 2368 JDWP::FrameId frame_id; 2369}; 2370 2371JDWP::JdwpError Dbg::GetThisObject(JDWP::ObjectId thread_id, JDWP::FrameId frame_id, 2372 JDWP::ObjectId* result) { 2373 ScopedObjectAccessUnchecked soa(Thread::Current()); 2374 JDWP::JdwpError error; 2375 Thread* thread = DecodeThread(soa, thread_id, &error); 2376 if (error != JDWP::ERR_NONE) { 2377 return error; 2378 } 2379 if (!IsSuspendedForDebugger(soa, thread)) { 2380 return JDWP::ERR_THREAD_NOT_SUSPENDED; 2381 } 2382 std::unique_ptr<Context> context(Context::Create()); 2383 GetThisVisitor visitor(thread, context.get(), frame_id); 2384 visitor.WalkStack(); 2385 *result = gRegistry->Add(visitor.this_object); 2386 return JDWP::ERR_NONE; 2387} 2388 2389// Walks the stack until we find the frame with the given FrameId. 2390class FindFrameVisitor FINAL : public StackVisitor { 2391 public: 2392 FindFrameVisitor(Thread* thread, Context* context, JDWP::FrameId frame_id) 2393 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2394 : StackVisitor(thread, context), frame_id_(frame_id), error_(JDWP::ERR_INVALID_FRAMEID) {} 2395 2396 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 2397 // annotalysis. 2398 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 2399 if (GetFrameId() != frame_id_) { 2400 return true; // Not our frame, carry on. 2401 } 2402 mirror::ArtMethod* m = GetMethod(); 2403 if (m->IsNative()) { 2404 // We can't read/write local value from/into native method. 2405 error_ = JDWP::ERR_OPAQUE_FRAME; 2406 } else { 2407 // We found our frame. 2408 error_ = JDWP::ERR_NONE; 2409 } 2410 return false; 2411 } 2412 2413 JDWP::JdwpError GetError() const { 2414 return error_; 2415 } 2416 2417 private: 2418 const JDWP::FrameId frame_id_; 2419 JDWP::JdwpError error_; 2420}; 2421 2422JDWP::JdwpError Dbg::GetLocalValues(JDWP::Request* request, JDWP::ExpandBuf* pReply) { 2423 JDWP::ObjectId thread_id = request->ReadThreadId(); 2424 JDWP::FrameId frame_id = request->ReadFrameId(); 2425 2426 ScopedObjectAccessUnchecked soa(Thread::Current()); 2427 JDWP::JdwpError error; 2428 Thread* thread = DecodeThread(soa, thread_id, &error); 2429 if (error != JDWP::ERR_NONE) { 2430 return error; 2431 } 2432 if (!IsSuspendedForDebugger(soa, thread)) { 2433 return JDWP::ERR_THREAD_NOT_SUSPENDED; 2434 } 2435 // Find the frame with the given frame_id. 2436 std::unique_ptr<Context> context(Context::Create()); 2437 FindFrameVisitor visitor(thread, context.get(), frame_id); 2438 visitor.WalkStack(); 2439 if (visitor.GetError() != JDWP::ERR_NONE) { 2440 return visitor.GetError(); 2441 } 2442 2443 // Read the values from visitor's context. 2444 int32_t slot_count = request->ReadSigned32("slot count"); 2445 expandBufAdd4BE(pReply, slot_count); /* "int values" */ 2446 for (int32_t i = 0; i < slot_count; ++i) { 2447 uint32_t slot = request->ReadUnsigned32("slot"); 2448 JDWP::JdwpTag reqSigByte = request->ReadTag(); 2449 2450 VLOG(jdwp) << " --> slot " << slot << " " << reqSigByte; 2451 2452 size_t width = Dbg::GetTagWidth(reqSigByte); 2453 uint8_t* ptr = expandBufAddSpace(pReply, width + 1); 2454 error = Dbg::GetLocalValue(visitor, soa, slot, reqSigByte, ptr, width); 2455 if (error != JDWP::ERR_NONE) { 2456 return error; 2457 } 2458 } 2459 return JDWP::ERR_NONE; 2460} 2461 2462constexpr JDWP::JdwpError kStackFrameLocalAccessError = JDWP::ERR_ABSENT_INFORMATION; 2463 2464static std::string GetStackContextAsString(const StackVisitor& visitor) 2465 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2466 return StringPrintf(" at DEX pc 0x%08x in method %s", visitor.GetDexPc(false), 2467 PrettyMethod(visitor.GetMethod()).c_str()); 2468} 2469 2470static JDWP::JdwpError FailGetLocalValue(const StackVisitor& visitor, uint16_t vreg, 2471 JDWP::JdwpTag tag) 2472 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2473 LOG(ERROR) << "Failed to read " << tag << " local from register v" << vreg 2474 << GetStackContextAsString(visitor); 2475 return kStackFrameLocalAccessError; 2476} 2477 2478JDWP::JdwpError Dbg::GetLocalValue(const StackVisitor& visitor, ScopedObjectAccessUnchecked& soa, 2479 int slot, JDWP::JdwpTag tag, uint8_t* buf, size_t width) { 2480 mirror::ArtMethod* m = visitor.GetMethod(); 2481 JDWP::JdwpError error = JDWP::ERR_NONE; 2482 uint16_t vreg = DemangleSlot(slot, m, &error); 2483 if (error != JDWP::ERR_NONE) { 2484 return error; 2485 } 2486 // TODO: check that the tag is compatible with the actual type of the slot! 2487 switch (tag) { 2488 case JDWP::JT_BOOLEAN: { 2489 CHECK_EQ(width, 1U); 2490 uint32_t intVal; 2491 if (!visitor.GetVReg(m, vreg, kIntVReg, &intVal)) { 2492 return FailGetLocalValue(visitor, vreg, tag); 2493 } 2494 VLOG(jdwp) << "get boolean local " << vreg << " = " << intVal; 2495 JDWP::Set1(buf + 1, intVal != 0); 2496 break; 2497 } 2498 case JDWP::JT_BYTE: { 2499 CHECK_EQ(width, 1U); 2500 uint32_t intVal; 2501 if (!visitor.GetVReg(m, vreg, kIntVReg, &intVal)) { 2502 return FailGetLocalValue(visitor, vreg, tag); 2503 } 2504 VLOG(jdwp) << "get byte local " << vreg << " = " << intVal; 2505 JDWP::Set1(buf + 1, intVal); 2506 break; 2507 } 2508 case JDWP::JT_SHORT: 2509 case JDWP::JT_CHAR: { 2510 CHECK_EQ(width, 2U); 2511 uint32_t intVal; 2512 if (!visitor.GetVReg(m, vreg, kIntVReg, &intVal)) { 2513 return FailGetLocalValue(visitor, vreg, tag); 2514 } 2515 VLOG(jdwp) << "get short/char local " << vreg << " = " << intVal; 2516 JDWP::Set2BE(buf + 1, intVal); 2517 break; 2518 } 2519 case JDWP::JT_INT: { 2520 CHECK_EQ(width, 4U); 2521 uint32_t intVal; 2522 if (!visitor.GetVReg(m, vreg, kIntVReg, &intVal)) { 2523 return FailGetLocalValue(visitor, vreg, tag); 2524 } 2525 VLOG(jdwp) << "get int local " << vreg << " = " << intVal; 2526 JDWP::Set4BE(buf + 1, intVal); 2527 break; 2528 } 2529 case JDWP::JT_FLOAT: { 2530 CHECK_EQ(width, 4U); 2531 uint32_t intVal; 2532 if (!visitor.GetVReg(m, vreg, kFloatVReg, &intVal)) { 2533 return FailGetLocalValue(visitor, vreg, tag); 2534 } 2535 VLOG(jdwp) << "get float local " << vreg << " = " << intVal; 2536 JDWP::Set4BE(buf + 1, intVal); 2537 break; 2538 } 2539 case JDWP::JT_ARRAY: 2540 case JDWP::JT_CLASS_LOADER: 2541 case JDWP::JT_CLASS_OBJECT: 2542 case JDWP::JT_OBJECT: 2543 case JDWP::JT_STRING: 2544 case JDWP::JT_THREAD: 2545 case JDWP::JT_THREAD_GROUP: { 2546 CHECK_EQ(width, sizeof(JDWP::ObjectId)); 2547 uint32_t intVal; 2548 if (!visitor.GetVReg(m, vreg, kReferenceVReg, &intVal)) { 2549 return FailGetLocalValue(visitor, vreg, tag); 2550 } 2551 mirror::Object* o = reinterpret_cast<mirror::Object*>(intVal); 2552 VLOG(jdwp) << "get " << tag << " object local " << vreg << " = " << o; 2553 if (!Runtime::Current()->GetHeap()->IsValidObjectAddress(o)) { 2554 LOG(FATAL) << StringPrintf("Found invalid object %#" PRIxPTR " in register v%u", 2555 reinterpret_cast<uintptr_t>(o), vreg) 2556 << GetStackContextAsString(visitor); 2557 UNREACHABLE(); 2558 } 2559 tag = TagFromObject(soa, o); 2560 JDWP::SetObjectId(buf + 1, gRegistry->Add(o)); 2561 break; 2562 } 2563 case JDWP::JT_DOUBLE: { 2564 CHECK_EQ(width, 8U); 2565 uint64_t longVal; 2566 if (!visitor.GetVRegPair(m, vreg, kDoubleLoVReg, kDoubleHiVReg, &longVal)) { 2567 return FailGetLocalValue(visitor, vreg, tag); 2568 } 2569 VLOG(jdwp) << "get double local " << vreg << " = " << longVal; 2570 JDWP::Set8BE(buf + 1, longVal); 2571 break; 2572 } 2573 case JDWP::JT_LONG: { 2574 CHECK_EQ(width, 8U); 2575 uint64_t longVal; 2576 if (!visitor.GetVRegPair(m, vreg, kLongLoVReg, kLongHiVReg, &longVal)) { 2577 return FailGetLocalValue(visitor, vreg, tag); 2578 } 2579 VLOG(jdwp) << "get long local " << vreg << " = " << longVal; 2580 JDWP::Set8BE(buf + 1, longVal); 2581 break; 2582 } 2583 default: 2584 LOG(FATAL) << "Unknown tag " << tag; 2585 UNREACHABLE(); 2586 } 2587 2588 // Prepend tag, which may have been updated. 2589 JDWP::Set1(buf, tag); 2590 return JDWP::ERR_NONE; 2591} 2592 2593JDWP::JdwpError Dbg::SetLocalValues(JDWP::Request* request) { 2594 JDWP::ObjectId thread_id = request->ReadThreadId(); 2595 JDWP::FrameId frame_id = request->ReadFrameId(); 2596 2597 ScopedObjectAccessUnchecked soa(Thread::Current()); 2598 JDWP::JdwpError error; 2599 Thread* thread = DecodeThread(soa, thread_id, &error); 2600 if (error != JDWP::ERR_NONE) { 2601 return error; 2602 } 2603 if (!IsSuspendedForDebugger(soa, thread)) { 2604 return JDWP::ERR_THREAD_NOT_SUSPENDED; 2605 } 2606 // Find the frame with the given frame_id. 2607 std::unique_ptr<Context> context(Context::Create()); 2608 FindFrameVisitor visitor(thread, context.get(), frame_id); 2609 visitor.WalkStack(); 2610 if (visitor.GetError() != JDWP::ERR_NONE) { 2611 return visitor.GetError(); 2612 } 2613 2614 // Writes the values into visitor's context. 2615 int32_t slot_count = request->ReadSigned32("slot count"); 2616 for (int32_t i = 0; i < slot_count; ++i) { 2617 uint32_t slot = request->ReadUnsigned32("slot"); 2618 JDWP::JdwpTag sigByte = request->ReadTag(); 2619 size_t width = Dbg::GetTagWidth(sigByte); 2620 uint64_t value = request->ReadValue(width); 2621 2622 VLOG(jdwp) << " --> slot " << slot << " " << sigByte << " " << value; 2623 error = Dbg::SetLocalValue(visitor, slot, sigByte, value, width); 2624 if (error != JDWP::ERR_NONE) { 2625 return error; 2626 } 2627 } 2628 return JDWP::ERR_NONE; 2629} 2630 2631template<typename T> 2632static JDWP::JdwpError FailSetLocalValue(const StackVisitor& visitor, uint16_t vreg, 2633 JDWP::JdwpTag tag, T value) 2634 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2635 LOG(ERROR) << "Failed to write " << tag << " local " << value 2636 << " (0x" << std::hex << value << ") into register v" << vreg 2637 << GetStackContextAsString(visitor); 2638 return kStackFrameLocalAccessError; 2639} 2640 2641JDWP::JdwpError Dbg::SetLocalValue(StackVisitor& visitor, int slot, JDWP::JdwpTag tag, 2642 uint64_t value, size_t width) { 2643 mirror::ArtMethod* m = visitor.GetMethod(); 2644 JDWP::JdwpError error = JDWP::ERR_NONE; 2645 uint16_t vreg = DemangleSlot(slot, m, &error); 2646 if (error != JDWP::ERR_NONE) { 2647 return error; 2648 } 2649 // TODO: check that the tag is compatible with the actual type of the slot! 2650 switch (tag) { 2651 case JDWP::JT_BOOLEAN: 2652 case JDWP::JT_BYTE: 2653 CHECK_EQ(width, 1U); 2654 if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(value), kIntVReg)) { 2655 return FailSetLocalValue(visitor, vreg, tag, static_cast<uint32_t>(value)); 2656 } 2657 break; 2658 case JDWP::JT_SHORT: 2659 case JDWP::JT_CHAR: 2660 CHECK_EQ(width, 2U); 2661 if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(value), kIntVReg)) { 2662 return FailSetLocalValue(visitor, vreg, tag, static_cast<uint32_t>(value)); 2663 } 2664 break; 2665 case JDWP::JT_INT: 2666 CHECK_EQ(width, 4U); 2667 if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(value), kIntVReg)) { 2668 return FailSetLocalValue(visitor, vreg, tag, static_cast<uint32_t>(value)); 2669 } 2670 break; 2671 case JDWP::JT_FLOAT: 2672 CHECK_EQ(width, 4U); 2673 if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(value), kFloatVReg)) { 2674 return FailSetLocalValue(visitor, vreg, tag, static_cast<uint32_t>(value)); 2675 } 2676 break; 2677 case JDWP::JT_ARRAY: 2678 case JDWP::JT_CLASS_LOADER: 2679 case JDWP::JT_CLASS_OBJECT: 2680 case JDWP::JT_OBJECT: 2681 case JDWP::JT_STRING: 2682 case JDWP::JT_THREAD: 2683 case JDWP::JT_THREAD_GROUP: { 2684 CHECK_EQ(width, sizeof(JDWP::ObjectId)); 2685 mirror::Object* o = gRegistry->Get<mirror::Object*>(static_cast<JDWP::ObjectId>(value), 2686 &error); 2687 if (error != JDWP::ERR_NONE) { 2688 VLOG(jdwp) << tag << " object " << o << " is an invalid object"; 2689 return JDWP::ERR_INVALID_OBJECT; 2690 } 2691 if (!visitor.SetVReg(m, vreg, static_cast<uint32_t>(reinterpret_cast<uintptr_t>(o)), 2692 kReferenceVReg)) { 2693 return FailSetLocalValue(visitor, vreg, tag, reinterpret_cast<uintptr_t>(o)); 2694 } 2695 break; 2696 } 2697 case JDWP::JT_DOUBLE: { 2698 CHECK_EQ(width, 8U); 2699 if (!visitor.SetVRegPair(m, vreg, value, kDoubleLoVReg, kDoubleHiVReg)) { 2700 return FailSetLocalValue(visitor, vreg, tag, value); 2701 } 2702 break; 2703 } 2704 case JDWP::JT_LONG: { 2705 CHECK_EQ(width, 8U); 2706 if (!visitor.SetVRegPair(m, vreg, value, kLongLoVReg, kLongHiVReg)) { 2707 return FailSetLocalValue(visitor, vreg, tag, value); 2708 } 2709 break; 2710 } 2711 default: 2712 LOG(FATAL) << "Unknown tag " << tag; 2713 UNREACHABLE(); 2714 } 2715 return JDWP::ERR_NONE; 2716} 2717 2718static void SetEventLocation(JDWP::EventLocation* location, mirror::ArtMethod* m, uint32_t dex_pc) 2719 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2720 DCHECK(location != nullptr); 2721 if (m == nullptr) { 2722 memset(location, 0, sizeof(*location)); 2723 } else { 2724 location->method = m; 2725 location->dex_pc = (m->IsNative() || m->IsProxyMethod()) ? static_cast<uint32_t>(-1) : dex_pc; 2726 } 2727} 2728 2729void Dbg::PostLocationEvent(mirror::ArtMethod* m, int dex_pc, mirror::Object* this_object, 2730 int event_flags, const JValue* return_value) { 2731 if (!IsDebuggerActive()) { 2732 return; 2733 } 2734 DCHECK(m != nullptr); 2735 DCHECK_EQ(m->IsStatic(), this_object == nullptr); 2736 JDWP::EventLocation location; 2737 SetEventLocation(&location, m, dex_pc); 2738 2739 gJdwpState->PostLocationEvent(&location, this_object, event_flags, return_value); 2740} 2741 2742void Dbg::PostFieldAccessEvent(mirror::ArtMethod* m, int dex_pc, 2743 mirror::Object* this_object, ArtField* f) { 2744 if (!IsDebuggerActive()) { 2745 return; 2746 } 2747 DCHECK(m != nullptr); 2748 DCHECK(f != nullptr); 2749 JDWP::EventLocation location; 2750 SetEventLocation(&location, m, dex_pc); 2751 2752 gJdwpState->PostFieldEvent(&location, f, this_object, nullptr, false); 2753} 2754 2755void Dbg::PostFieldModificationEvent(mirror::ArtMethod* m, int dex_pc, 2756 mirror::Object* this_object, ArtField* f, 2757 const JValue* field_value) { 2758 if (!IsDebuggerActive()) { 2759 return; 2760 } 2761 DCHECK(m != nullptr); 2762 DCHECK(f != nullptr); 2763 DCHECK(field_value != nullptr); 2764 JDWP::EventLocation location; 2765 SetEventLocation(&location, m, dex_pc); 2766 2767 gJdwpState->PostFieldEvent(&location, f, this_object, field_value, true); 2768} 2769 2770/** 2771 * Finds the location where this exception will be caught. We search until we reach the top 2772 * frame, in which case this exception is considered uncaught. 2773 */ 2774class CatchLocationFinder : public StackVisitor { 2775 public: 2776 CatchLocationFinder(Thread* self, const Handle<mirror::Throwable>& exception, Context* context) 2777 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 2778 : StackVisitor(self, context), 2779 self_(self), 2780 exception_(exception), 2781 handle_scope_(self), 2782 this_at_throw_(handle_scope_.NewHandle<mirror::Object>(nullptr)), 2783 catch_method_(handle_scope_.NewHandle<mirror::ArtMethod>(nullptr)), 2784 throw_method_(handle_scope_.NewHandle<mirror::ArtMethod>(nullptr)), 2785 catch_dex_pc_(DexFile::kDexNoIndex), 2786 throw_dex_pc_(DexFile::kDexNoIndex) { 2787 } 2788 2789 bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2790 mirror::ArtMethod* method = GetMethod(); 2791 DCHECK(method != nullptr); 2792 if (method->IsRuntimeMethod()) { 2793 // Ignore callee save method. 2794 DCHECK(method->IsCalleeSaveMethod()); 2795 return true; 2796 } 2797 2798 uint32_t dex_pc = GetDexPc(); 2799 if (throw_method_.Get() == nullptr) { 2800 // First Java method found. It is either the method that threw the exception, 2801 // or the Java native method that is reporting an exception thrown by 2802 // native code. 2803 this_at_throw_.Assign(GetThisObject()); 2804 throw_method_.Assign(method); 2805 throw_dex_pc_ = dex_pc; 2806 } 2807 2808 if (dex_pc != DexFile::kDexNoIndex) { 2809 StackHandleScope<2> hs(self_); 2810 uint32_t found_dex_pc; 2811 Handle<mirror::Class> exception_class(hs.NewHandle(exception_->GetClass())); 2812 Handle<mirror::ArtMethod> h_method(hs.NewHandle(method)); 2813 bool unused_clear_exception; 2814 found_dex_pc = mirror::ArtMethod::FindCatchBlock( 2815 h_method, exception_class, dex_pc, &unused_clear_exception); 2816 if (found_dex_pc != DexFile::kDexNoIndex) { 2817 catch_method_.Assign(method); 2818 catch_dex_pc_ = found_dex_pc; 2819 return false; // End stack walk. 2820 } 2821 } 2822 return true; // Continue stack walk. 2823 } 2824 2825 mirror::ArtMethod* GetCatchMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2826 return catch_method_.Get(); 2827 } 2828 2829 mirror::ArtMethod* GetThrowMethod() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2830 return throw_method_.Get(); 2831 } 2832 2833 mirror::Object* GetThisAtThrow() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2834 return this_at_throw_.Get(); 2835 } 2836 2837 uint32_t GetCatchDexPc() const { 2838 return catch_dex_pc_; 2839 } 2840 2841 uint32_t GetThrowDexPc() const { 2842 return throw_dex_pc_; 2843 } 2844 2845 private: 2846 Thread* const self_; 2847 const Handle<mirror::Throwable>& exception_; 2848 StackHandleScope<3> handle_scope_; 2849 MutableHandle<mirror::Object> this_at_throw_; 2850 MutableHandle<mirror::ArtMethod> catch_method_; 2851 MutableHandle<mirror::ArtMethod> throw_method_; 2852 uint32_t catch_dex_pc_; 2853 uint32_t throw_dex_pc_; 2854 2855 DISALLOW_COPY_AND_ASSIGN(CatchLocationFinder); 2856}; 2857 2858void Dbg::PostException(mirror::Throwable* exception_object) { 2859 if (!IsDebuggerActive()) { 2860 return; 2861 } 2862 StackHandleScope<1> handle_scope(Thread::Current()); 2863 Handle<mirror::Throwable> h_exception(handle_scope.NewHandle(exception_object)); 2864 std::unique_ptr<Context> context(Context::Create()); 2865 CatchLocationFinder clf(Thread::Current(), h_exception, context.get()); 2866 clf.WalkStack(/* include_transitions */ false); 2867 JDWP::EventLocation exception_throw_location; 2868 SetEventLocation(&exception_throw_location, clf.GetThrowMethod(), clf.GetThrowDexPc()); 2869 JDWP::EventLocation exception_catch_location; 2870 SetEventLocation(&exception_catch_location, clf.GetCatchMethod(), clf.GetCatchDexPc()); 2871 2872 gJdwpState->PostException(&exception_throw_location, h_exception.Get(), &exception_catch_location, 2873 clf.GetThisAtThrow()); 2874} 2875 2876void Dbg::PostClassPrepare(mirror::Class* c) { 2877 if (!IsDebuggerActive()) { 2878 return; 2879 } 2880 gJdwpState->PostClassPrepare(c); 2881} 2882 2883void Dbg::UpdateDebugger(Thread* thread, mirror::Object* this_object, 2884 mirror::ArtMethod* m, uint32_t dex_pc, 2885 int event_flags, const JValue* return_value) { 2886 if (!IsDebuggerActive() || dex_pc == static_cast<uint32_t>(-2) /* fake method exit */) { 2887 return; 2888 } 2889 2890 if (IsBreakpoint(m, dex_pc)) { 2891 event_flags |= kBreakpoint; 2892 } 2893 2894 // If the debugger is single-stepping one of our threads, check to 2895 // see if we're that thread and we've reached a step point. 2896 const SingleStepControl* single_step_control = thread->GetSingleStepControl(); 2897 if (single_step_control != nullptr) { 2898 CHECK(!m->IsNative()); 2899 if (single_step_control->GetStepDepth() == JDWP::SD_INTO) { 2900 // Step into method calls. We break when the line number 2901 // or method pointer changes. If we're in SS_MIN mode, we 2902 // always stop. 2903 if (single_step_control->GetMethod() != m) { 2904 event_flags |= kSingleStep; 2905 VLOG(jdwp) << "SS new method"; 2906 } else if (single_step_control->GetStepSize() == JDWP::SS_MIN) { 2907 event_flags |= kSingleStep; 2908 VLOG(jdwp) << "SS new instruction"; 2909 } else if (single_step_control->ContainsDexPc(dex_pc)) { 2910 event_flags |= kSingleStep; 2911 VLOG(jdwp) << "SS new line"; 2912 } 2913 } else if (single_step_control->GetStepDepth() == JDWP::SD_OVER) { 2914 // Step over method calls. We break when the line number is 2915 // different and the frame depth is <= the original frame 2916 // depth. (We can't just compare on the method, because we 2917 // might get unrolled past it by an exception, and it's tricky 2918 // to identify recursion.) 2919 2920 int stack_depth = GetStackDepth(thread); 2921 2922 if (stack_depth < single_step_control->GetStackDepth()) { 2923 // Popped up one or more frames, always trigger. 2924 event_flags |= kSingleStep; 2925 VLOG(jdwp) << "SS method pop"; 2926 } else if (stack_depth == single_step_control->GetStackDepth()) { 2927 // Same depth, see if we moved. 2928 if (single_step_control->GetStepSize() == JDWP::SS_MIN) { 2929 event_flags |= kSingleStep; 2930 VLOG(jdwp) << "SS new instruction"; 2931 } else if (single_step_control->ContainsDexPc(dex_pc)) { 2932 event_flags |= kSingleStep; 2933 VLOG(jdwp) << "SS new line"; 2934 } 2935 } 2936 } else { 2937 CHECK_EQ(single_step_control->GetStepDepth(), JDWP::SD_OUT); 2938 // Return from the current method. We break when the frame 2939 // depth pops up. 2940 2941 // This differs from the "method exit" break in that it stops 2942 // with the PC at the next instruction in the returned-to 2943 // function, rather than the end of the returning function. 2944 2945 int stack_depth = GetStackDepth(thread); 2946 if (stack_depth < single_step_control->GetStackDepth()) { 2947 event_flags |= kSingleStep; 2948 VLOG(jdwp) << "SS method pop"; 2949 } 2950 } 2951 } 2952 2953 // If there's something interesting going on, see if it matches one 2954 // of the debugger filters. 2955 if (event_flags != 0) { 2956 Dbg::PostLocationEvent(m, dex_pc, this_object, event_flags, return_value); 2957 } 2958} 2959 2960size_t* Dbg::GetReferenceCounterForEvent(uint32_t instrumentation_event) { 2961 switch (instrumentation_event) { 2962 case instrumentation::Instrumentation::kMethodEntered: 2963 return &method_enter_event_ref_count_; 2964 case instrumentation::Instrumentation::kMethodExited: 2965 return &method_exit_event_ref_count_; 2966 case instrumentation::Instrumentation::kDexPcMoved: 2967 return &dex_pc_change_event_ref_count_; 2968 case instrumentation::Instrumentation::kFieldRead: 2969 return &field_read_event_ref_count_; 2970 case instrumentation::Instrumentation::kFieldWritten: 2971 return &field_write_event_ref_count_; 2972 case instrumentation::Instrumentation::kExceptionCaught: 2973 return &exception_catch_event_ref_count_; 2974 default: 2975 return nullptr; 2976 } 2977} 2978 2979// Process request while all mutator threads are suspended. 2980void Dbg::ProcessDeoptimizationRequest(const DeoptimizationRequest& request) { 2981 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 2982 switch (request.GetKind()) { 2983 case DeoptimizationRequest::kNothing: 2984 LOG(WARNING) << "Ignoring empty deoptimization request."; 2985 break; 2986 case DeoptimizationRequest::kRegisterForEvent: 2987 VLOG(jdwp) << StringPrintf("Add debugger as listener for instrumentation event 0x%x", 2988 request.InstrumentationEvent()); 2989 instrumentation->AddListener(&gDebugInstrumentationListener, request.InstrumentationEvent()); 2990 instrumentation_events_ |= request.InstrumentationEvent(); 2991 break; 2992 case DeoptimizationRequest::kUnregisterForEvent: 2993 VLOG(jdwp) << StringPrintf("Remove debugger as listener for instrumentation event 0x%x", 2994 request.InstrumentationEvent()); 2995 instrumentation->RemoveListener(&gDebugInstrumentationListener, 2996 request.InstrumentationEvent()); 2997 instrumentation_events_ &= ~request.InstrumentationEvent(); 2998 break; 2999 case DeoptimizationRequest::kFullDeoptimization: 3000 VLOG(jdwp) << "Deoptimize the world ..."; 3001 instrumentation->DeoptimizeEverything(); 3002 VLOG(jdwp) << "Deoptimize the world DONE"; 3003 break; 3004 case DeoptimizationRequest::kFullUndeoptimization: 3005 VLOG(jdwp) << "Undeoptimize the world ..."; 3006 instrumentation->UndeoptimizeEverything(); 3007 VLOG(jdwp) << "Undeoptimize the world DONE"; 3008 break; 3009 case DeoptimizationRequest::kSelectiveDeoptimization: 3010 VLOG(jdwp) << "Deoptimize method " << PrettyMethod(request.Method()) << " ..."; 3011 instrumentation->Deoptimize(request.Method()); 3012 VLOG(jdwp) << "Deoptimize method " << PrettyMethod(request.Method()) << " DONE"; 3013 break; 3014 case DeoptimizationRequest::kSelectiveUndeoptimization: 3015 VLOG(jdwp) << "Undeoptimize method " << PrettyMethod(request.Method()) << " ..."; 3016 instrumentation->Undeoptimize(request.Method()); 3017 VLOG(jdwp) << "Undeoptimize method " << PrettyMethod(request.Method()) << " DONE"; 3018 break; 3019 default: 3020 LOG(FATAL) << "Unsupported deoptimization request kind " << request.GetKind(); 3021 break; 3022 } 3023} 3024 3025void Dbg::RequestDeoptimization(const DeoptimizationRequest& req) { 3026 if (req.GetKind() == DeoptimizationRequest::kNothing) { 3027 // Nothing to do. 3028 return; 3029 } 3030 MutexLock mu(Thread::Current(), *Locks::deoptimization_lock_); 3031 RequestDeoptimizationLocked(req); 3032} 3033 3034void Dbg::RequestDeoptimizationLocked(const DeoptimizationRequest& req) { 3035 switch (req.GetKind()) { 3036 case DeoptimizationRequest::kRegisterForEvent: { 3037 DCHECK_NE(req.InstrumentationEvent(), 0u); 3038 size_t* counter = GetReferenceCounterForEvent(req.InstrumentationEvent()); 3039 CHECK(counter != nullptr) << StringPrintf("No counter for instrumentation event 0x%x", 3040 req.InstrumentationEvent()); 3041 if (*counter == 0) { 3042 VLOG(jdwp) << StringPrintf("Queue request #%zd to start listening to instrumentation event 0x%x", 3043 deoptimization_requests_.size(), req.InstrumentationEvent()); 3044 deoptimization_requests_.push_back(req); 3045 } 3046 *counter = *counter + 1; 3047 break; 3048 } 3049 case DeoptimizationRequest::kUnregisterForEvent: { 3050 DCHECK_NE(req.InstrumentationEvent(), 0u); 3051 size_t* counter = GetReferenceCounterForEvent(req.InstrumentationEvent()); 3052 CHECK(counter != nullptr) << StringPrintf("No counter for instrumentation event 0x%x", 3053 req.InstrumentationEvent()); 3054 *counter = *counter - 1; 3055 if (*counter == 0) { 3056 VLOG(jdwp) << StringPrintf("Queue request #%zd to stop listening to instrumentation event 0x%x", 3057 deoptimization_requests_.size(), req.InstrumentationEvent()); 3058 deoptimization_requests_.push_back(req); 3059 } 3060 break; 3061 } 3062 case DeoptimizationRequest::kFullDeoptimization: { 3063 DCHECK(req.Method() == nullptr); 3064 if (full_deoptimization_event_count_ == 0) { 3065 VLOG(jdwp) << "Queue request #" << deoptimization_requests_.size() 3066 << " for full deoptimization"; 3067 deoptimization_requests_.push_back(req); 3068 } 3069 ++full_deoptimization_event_count_; 3070 break; 3071 } 3072 case DeoptimizationRequest::kFullUndeoptimization: { 3073 DCHECK(req.Method() == nullptr); 3074 DCHECK_GT(full_deoptimization_event_count_, 0U); 3075 --full_deoptimization_event_count_; 3076 if (full_deoptimization_event_count_ == 0) { 3077 VLOG(jdwp) << "Queue request #" << deoptimization_requests_.size() 3078 << " for full undeoptimization"; 3079 deoptimization_requests_.push_back(req); 3080 } 3081 break; 3082 } 3083 case DeoptimizationRequest::kSelectiveDeoptimization: { 3084 DCHECK(req.Method() != nullptr); 3085 VLOG(jdwp) << "Queue request #" << deoptimization_requests_.size() 3086 << " for deoptimization of " << PrettyMethod(req.Method()); 3087 deoptimization_requests_.push_back(req); 3088 break; 3089 } 3090 case DeoptimizationRequest::kSelectiveUndeoptimization: { 3091 DCHECK(req.Method() != nullptr); 3092 VLOG(jdwp) << "Queue request #" << deoptimization_requests_.size() 3093 << " for undeoptimization of " << PrettyMethod(req.Method()); 3094 deoptimization_requests_.push_back(req); 3095 break; 3096 } 3097 default: { 3098 LOG(FATAL) << "Unknown deoptimization request kind " << req.GetKind(); 3099 break; 3100 } 3101 } 3102} 3103 3104void Dbg::ManageDeoptimization() { 3105 Thread* const self = Thread::Current(); 3106 { 3107 // Avoid suspend/resume if there is no pending request. 3108 MutexLock mu(self, *Locks::deoptimization_lock_); 3109 if (deoptimization_requests_.empty()) { 3110 return; 3111 } 3112 } 3113 CHECK_EQ(self->GetState(), kRunnable); 3114 self->TransitionFromRunnableToSuspended(kWaitingForDeoptimization); 3115 // We need to suspend mutator threads first. 3116 Runtime* const runtime = Runtime::Current(); 3117 runtime->GetThreadList()->SuspendAll(__FUNCTION__); 3118 const ThreadState old_state = self->SetStateUnsafe(kRunnable); 3119 { 3120 MutexLock mu(self, *Locks::deoptimization_lock_); 3121 size_t req_index = 0; 3122 for (DeoptimizationRequest& request : deoptimization_requests_) { 3123 VLOG(jdwp) << "Process deoptimization request #" << req_index++; 3124 ProcessDeoptimizationRequest(request); 3125 } 3126 deoptimization_requests_.clear(); 3127 } 3128 CHECK_EQ(self->SetStateUnsafe(old_state), kRunnable); 3129 runtime->GetThreadList()->ResumeAll(); 3130 self->TransitionFromSuspendedToRunnable(); 3131} 3132 3133static bool IsMethodPossiblyInlined(Thread* self, mirror::ArtMethod* m) 3134 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3135 const DexFile::CodeItem* code_item = m->GetCodeItem(); 3136 if (code_item == nullptr) { 3137 // TODO We should not be asked to watch location in a native or abstract method so the code item 3138 // should never be null. We could just check we never encounter this case. 3139 return false; 3140 } 3141 // Note: method verifier may cause thread suspension. 3142 self->AssertThreadSuspensionIsAllowable(); 3143 StackHandleScope<3> hs(self); 3144 mirror::Class* declaring_class = m->GetDeclaringClass(); 3145 Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache())); 3146 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader())); 3147 Handle<mirror::ArtMethod> method(hs.NewHandle(m)); 3148 verifier::MethodVerifier verifier(self, dex_cache->GetDexFile(), dex_cache, class_loader, 3149 &m->GetClassDef(), code_item, m->GetDexMethodIndex(), method, 3150 m->GetAccessFlags(), false, true, false, true); 3151 // Note: we don't need to verify the method. 3152 return InlineMethodAnalyser::AnalyseMethodCode(&verifier, nullptr); 3153} 3154 3155static const Breakpoint* FindFirstBreakpointForMethod(mirror::ArtMethod* m) 3156 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, Locks::breakpoint_lock_) { 3157 for (Breakpoint& breakpoint : gBreakpoints) { 3158 if (breakpoint.Method() == m) { 3159 return &breakpoint; 3160 } 3161 } 3162 return nullptr; 3163} 3164 3165bool Dbg::MethodHasAnyBreakpoints(mirror::ArtMethod* method) { 3166 ReaderMutexLock mu(Thread::Current(), *Locks::breakpoint_lock_); 3167 return FindFirstBreakpointForMethod(method) != nullptr; 3168} 3169 3170// Sanity checks all existing breakpoints on the same method. 3171static void SanityCheckExistingBreakpoints(mirror::ArtMethod* m, 3172 DeoptimizationRequest::Kind deoptimization_kind) 3173 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, Locks::breakpoint_lock_) { 3174 for (const Breakpoint& breakpoint : gBreakpoints) { 3175 if (breakpoint.Method() == m) { 3176 CHECK_EQ(deoptimization_kind, breakpoint.GetDeoptimizationKind()); 3177 } 3178 } 3179 instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); 3180 if (deoptimization_kind == DeoptimizationRequest::kFullDeoptimization) { 3181 // We should have deoptimized everything but not "selectively" deoptimized this method. 3182 CHECK(instrumentation->AreAllMethodsDeoptimized()); 3183 CHECK(!instrumentation->IsDeoptimized(m)); 3184 } else if (deoptimization_kind == DeoptimizationRequest::kSelectiveDeoptimization) { 3185 // We should have "selectively" deoptimized this method. 3186 // Note: while we have not deoptimized everything for this method, we may have done it for 3187 // another event. 3188 CHECK(instrumentation->IsDeoptimized(m)); 3189 } else { 3190 // This method does not require deoptimization. 3191 CHECK_EQ(deoptimization_kind, DeoptimizationRequest::kNothing); 3192 CHECK(!instrumentation->IsDeoptimized(m)); 3193 } 3194} 3195 3196// Returns the deoptimization kind required to set a breakpoint in a method. 3197// If a breakpoint has already been set, we also return the first breakpoint 3198// through the given 'existing_brkpt' pointer. 3199static DeoptimizationRequest::Kind GetRequiredDeoptimizationKind(Thread* self, 3200 mirror::ArtMethod* m, 3201 const Breakpoint** existing_brkpt) 3202 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 3203 if (!Dbg::RequiresDeoptimization()) { 3204 // We already run in interpreter-only mode so we don't need to deoptimize anything. 3205 VLOG(jdwp) << "No need for deoptimization when fully running with interpreter for method " 3206 << PrettyMethod(m); 3207 return DeoptimizationRequest::kNothing; 3208 } 3209 const Breakpoint* first_breakpoint; 3210 { 3211 ReaderMutexLock mu(self, *Locks::breakpoint_lock_); 3212 first_breakpoint = FindFirstBreakpointForMethod(m); 3213 *existing_brkpt = first_breakpoint; 3214 } 3215 3216 if (first_breakpoint == nullptr) { 3217 // There is no breakpoint on this method yet: we need to deoptimize. If this method may be 3218 // inlined, we deoptimize everything; otherwise we deoptimize only this method. 3219 // Note: IsMethodPossiblyInlined goes into the method verifier and may cause thread suspension. 3220 // Therefore we must not hold any lock when we call it. 3221 bool need_full_deoptimization = IsMethodPossiblyInlined(self, m); 3222 if (need_full_deoptimization) { 3223 VLOG(jdwp) << "Need full deoptimization because of possible inlining of method " 3224 << PrettyMethod(m); 3225 return DeoptimizationRequest::kFullDeoptimization; 3226 } else { 3227 // We don't need to deoptimize if the method has not been compiled. 3228 ClassLinker* const class_linker = Runtime::Current()->GetClassLinker(); 3229 const bool is_compiled = class_linker->GetOatMethodQuickCodeFor(m) != nullptr; 3230 if (is_compiled) { 3231 // If the method may be called through its direct code pointer (without loading 3232 // its updated entrypoint), we need full deoptimization to not miss the breakpoint. 3233 if (class_linker->MayBeCalledWithDirectCodePointer(m)) { 3234 VLOG(jdwp) << "Need full deoptimization because of possible direct code call " 3235 << "into image for compiled method " << PrettyMethod(m); 3236 return DeoptimizationRequest::kFullDeoptimization; 3237 } else { 3238 VLOG(jdwp) << "Need selective deoptimization for compiled method " << PrettyMethod(m); 3239 return DeoptimizationRequest::kSelectiveDeoptimization; 3240 } 3241 } else { 3242 // Method is not compiled: we don't need to deoptimize. 3243 VLOG(jdwp) << "No need for deoptimization for non-compiled method " << PrettyMethod(m); 3244 return DeoptimizationRequest::kNothing; 3245 } 3246 } 3247 } else { 3248 // There is at least one breakpoint for this method: we don't need to deoptimize. 3249 // Let's check that all breakpoints are configured the same way for deoptimization. 3250 VLOG(jdwp) << "Breakpoint already set: no deoptimization is required"; 3251 DeoptimizationRequest::Kind deoptimization_kind = first_breakpoint->GetDeoptimizationKind(); 3252 if (kIsDebugBuild) { 3253 ReaderMutexLock mu(self, *Locks::breakpoint_lock_); 3254 SanityCheckExistingBreakpoints(m, deoptimization_kind); 3255 } 3256 return DeoptimizationRequest::kNothing; 3257 } 3258} 3259 3260// Installs a breakpoint at the specified location. Also indicates through the deoptimization 3261// request if we need to deoptimize. 3262void Dbg::WatchLocation(const JDWP::JdwpLocation* location, DeoptimizationRequest* req) { 3263 Thread* const self = Thread::Current(); 3264 mirror::ArtMethod* m = FromMethodId(location->method_id); 3265 DCHECK(m != nullptr) << "No method for method id " << location->method_id; 3266 3267 const Breakpoint* existing_breakpoint = nullptr; 3268 const DeoptimizationRequest::Kind deoptimization_kind = 3269 GetRequiredDeoptimizationKind(self, m, &existing_breakpoint); 3270 req->SetKind(deoptimization_kind); 3271 if (deoptimization_kind == DeoptimizationRequest::kSelectiveDeoptimization) { 3272 req->SetMethod(m); 3273 } else { 3274 CHECK(deoptimization_kind == DeoptimizationRequest::kNothing || 3275 deoptimization_kind == DeoptimizationRequest::kFullDeoptimization); 3276 req->SetMethod(nullptr); 3277 } 3278 3279 { 3280 WriterMutexLock mu(self, *Locks::breakpoint_lock_); 3281 // If there is at least one existing breakpoint on the same method, the new breakpoint 3282 // must have the same deoptimization kind than the existing breakpoint(s). 3283 DeoptimizationRequest::Kind breakpoint_deoptimization_kind; 3284 if (existing_breakpoint != nullptr) { 3285 breakpoint_deoptimization_kind = existing_breakpoint->GetDeoptimizationKind(); 3286 } else { 3287 breakpoint_deoptimization_kind = deoptimization_kind; 3288 } 3289 gBreakpoints.push_back(Breakpoint(m, location->dex_pc, breakpoint_deoptimization_kind)); 3290 VLOG(jdwp) << "Set breakpoint #" << (gBreakpoints.size() - 1) << ": " 3291 << gBreakpoints[gBreakpoints.size() - 1]; 3292 } 3293} 3294 3295// Uninstalls a breakpoint at the specified location. Also indicates through the deoptimization 3296// request if we need to undeoptimize. 3297void Dbg::UnwatchLocation(const JDWP::JdwpLocation* location, DeoptimizationRequest* req) { 3298 WriterMutexLock mu(Thread::Current(), *Locks::breakpoint_lock_); 3299 mirror::ArtMethod* m = FromMethodId(location->method_id); 3300 DCHECK(m != nullptr) << "No method for method id " << location->method_id; 3301 DeoptimizationRequest::Kind deoptimization_kind = DeoptimizationRequest::kNothing; 3302 for (size_t i = 0, e = gBreakpoints.size(); i < e; ++i) { 3303 if (gBreakpoints[i].DexPc() == location->dex_pc && gBreakpoints[i].Method() == m) { 3304 VLOG(jdwp) << "Removed breakpoint #" << i << ": " << gBreakpoints[i]; 3305 deoptimization_kind = gBreakpoints[i].GetDeoptimizationKind(); 3306 DCHECK_EQ(deoptimization_kind == DeoptimizationRequest::kSelectiveDeoptimization, 3307 Runtime::Current()->GetInstrumentation()->IsDeoptimized(m)); 3308 gBreakpoints.erase(gBreakpoints.begin() + i); 3309 break; 3310 } 3311 } 3312 const Breakpoint* const existing_breakpoint = FindFirstBreakpointForMethod(m); 3313 if (existing_breakpoint == nullptr) { 3314 // There is no more breakpoint on this method: we need to undeoptimize. 3315 if (deoptimization_kind == DeoptimizationRequest::kFullDeoptimization) { 3316 // This method required full deoptimization: we need to undeoptimize everything. 3317 req->SetKind(DeoptimizationRequest::kFullUndeoptimization); 3318 req->SetMethod(nullptr); 3319 } else if (deoptimization_kind == DeoptimizationRequest::kSelectiveDeoptimization) { 3320 // This method required selective deoptimization: we need to undeoptimize only that method. 3321 req->SetKind(DeoptimizationRequest::kSelectiveUndeoptimization); 3322 req->SetMethod(m); 3323 } else { 3324 // This method had no need for deoptimization: do nothing. 3325 CHECK_EQ(deoptimization_kind, DeoptimizationRequest::kNothing); 3326 req->SetKind(DeoptimizationRequest::kNothing); 3327 req->SetMethod(nullptr); 3328 } 3329 } else { 3330 // There is at least one breakpoint for this method: we don't need to undeoptimize. 3331 req->SetKind(DeoptimizationRequest::kNothing); 3332 req->SetMethod(nullptr); 3333 if (kIsDebugBuild) { 3334 SanityCheckExistingBreakpoints(m, deoptimization_kind); 3335 } 3336 } 3337} 3338 3339bool Dbg::IsForcedInterpreterNeededForCallingImpl(Thread* thread, mirror::ArtMethod* m) { 3340 const SingleStepControl* const ssc = thread->GetSingleStepControl(); 3341 if (ssc == nullptr) { 3342 // If we are not single-stepping, then we don't have to force interpreter. 3343 return false; 3344 } 3345 if (Runtime::Current()->GetInstrumentation()->InterpretOnly()) { 3346 // If we are in interpreter only mode, then we don't have to force interpreter. 3347 return false; 3348 } 3349 3350 if (!m->IsNative() && !m->IsProxyMethod()) { 3351 // If we want to step into a method, then we have to force interpreter on that call. 3352 if (ssc->GetStepDepth() == JDWP::SD_INTO) { 3353 return true; 3354 } 3355 } 3356 return false; 3357} 3358 3359bool Dbg::IsForcedInterpreterNeededForResolutionImpl(Thread* thread, mirror::ArtMethod* m) { 3360 instrumentation::Instrumentation* const instrumentation = 3361 Runtime::Current()->GetInstrumentation(); 3362 // If we are in interpreter only mode, then we don't have to force interpreter. 3363 if (instrumentation->InterpretOnly()) { 3364 return false; 3365 } 3366 // We can only interpret pure Java method. 3367 if (m->IsNative() || m->IsProxyMethod()) { 3368 return false; 3369 } 3370 const SingleStepControl* const ssc = thread->GetSingleStepControl(); 3371 if (ssc != nullptr) { 3372 // If we want to step into a method, then we have to force interpreter on that call. 3373 if (ssc->GetStepDepth() == JDWP::SD_INTO) { 3374 return true; 3375 } 3376 // If we are stepping out from a static initializer, by issuing a step 3377 // in or step over, that was implicitly invoked by calling a static method, 3378 // then we need to step into that method. Having a lower stack depth than 3379 // the one the single step control has indicates that the step originates 3380 // from the static initializer. 3381 if (ssc->GetStepDepth() != JDWP::SD_OUT && 3382 ssc->GetStackDepth() > GetStackDepth(thread)) { 3383 return true; 3384 } 3385 } 3386 // There are cases where we have to force interpreter on deoptimized methods, 3387 // because in some cases the call will not be performed by invoking an entry 3388 // point that has been replaced by the deoptimization, but instead by directly 3389 // invoking the compiled code of the method, for example. 3390 return instrumentation->IsDeoptimized(m); 3391} 3392 3393bool Dbg::IsForcedInstrumentationNeededForResolutionImpl(Thread* thread, mirror::ArtMethod* m) { 3394 // The upcall can be null and in that case we don't need to do anything. 3395 if (m == nullptr) { 3396 return false; 3397 } 3398 instrumentation::Instrumentation* const instrumentation = 3399 Runtime::Current()->GetInstrumentation(); 3400 // If we are in interpreter only mode, then we don't have to force interpreter. 3401 if (instrumentation->InterpretOnly()) { 3402 return false; 3403 } 3404 // We can only interpret pure Java method. 3405 if (m->IsNative() || m->IsProxyMethod()) { 3406 return false; 3407 } 3408 const SingleStepControl* const ssc = thread->GetSingleStepControl(); 3409 if (ssc != nullptr) { 3410 // If we are stepping out from a static initializer, by issuing a step 3411 // out, that was implicitly invoked by calling a static method, then we 3412 // need to step into the caller of that method. Having a lower stack 3413 // depth than the one the single step control has indicates that the 3414 // step originates from the static initializer. 3415 if (ssc->GetStepDepth() == JDWP::SD_OUT && 3416 ssc->GetStackDepth() > GetStackDepth(thread)) { 3417 return true; 3418 } 3419 } 3420 // If we are returning from a static intializer, that was implicitly 3421 // invoked by calling a static method and the caller is deoptimized, 3422 // then we have to deoptimize the stack without forcing interpreter 3423 // on the static method that was called originally. This problem can 3424 // be solved easily by forcing instrumentation on the called method, 3425 // because the instrumentation exit hook will recognise the need of 3426 // stack deoptimization by calling IsForcedInterpreterNeededForUpcall. 3427 return instrumentation->IsDeoptimized(m); 3428} 3429 3430bool Dbg::IsForcedInterpreterNeededForUpcallImpl(Thread* thread, mirror::ArtMethod* m) { 3431 // The upcall can be null and in that case we don't need to do anything. 3432 if (m == nullptr) { 3433 return false; 3434 } 3435 instrumentation::Instrumentation* const instrumentation = 3436 Runtime::Current()->GetInstrumentation(); 3437 // If we are in interpreter only mode, then we don't have to force interpreter. 3438 if (instrumentation->InterpretOnly()) { 3439 return false; 3440 } 3441 // We can only interpret pure Java method. 3442 if (m->IsNative() || m->IsProxyMethod()) { 3443 return false; 3444 } 3445 const SingleStepControl* const ssc = thread->GetSingleStepControl(); 3446 if (ssc != nullptr) { 3447 // The debugger is not interested in what is happening under the level 3448 // of the step, thus we only force interpreter when we are not below of 3449 // the step. 3450 if (ssc->GetStackDepth() >= GetStackDepth(thread)) { 3451 return true; 3452 } 3453 } 3454 // We have to require stack deoptimization if the upcall is deoptimized. 3455 return instrumentation->IsDeoptimized(m); 3456} 3457 3458// Scoped utility class to suspend a thread so that we may do tasks such as walk its stack. Doesn't 3459// cause suspension if the thread is the current thread. 3460class ScopedThreadSuspension { 3461 public: 3462 ScopedThreadSuspension(Thread* self, JDWP::ObjectId thread_id) 3463 LOCKS_EXCLUDED(Locks::thread_list_lock_) 3464 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : 3465 thread_(nullptr), 3466 error_(JDWP::ERR_NONE), 3467 self_suspend_(false), 3468 other_suspend_(false) { 3469 ScopedObjectAccessUnchecked soa(self); 3470 thread_ = DecodeThread(soa, thread_id, &error_); 3471 if (error_ == JDWP::ERR_NONE) { 3472 if (thread_ == soa.Self()) { 3473 self_suspend_ = true; 3474 } else { 3475 soa.Self()->TransitionFromRunnableToSuspended(kWaitingForDebuggerSuspension); 3476 jobject thread_peer = Dbg::GetObjectRegistry()->GetJObject(thread_id); 3477 bool timed_out; 3478 ThreadList* thread_list = Runtime::Current()->GetThreadList(); 3479 Thread* suspended_thread = thread_list->SuspendThreadByPeer(thread_peer, true, true, 3480 &timed_out); 3481 CHECK_EQ(soa.Self()->TransitionFromSuspendedToRunnable(), kWaitingForDebuggerSuspension); 3482 if (suspended_thread == nullptr) { 3483 // Thread terminated from under us while suspending. 3484 error_ = JDWP::ERR_INVALID_THREAD; 3485 } else { 3486 CHECK_EQ(suspended_thread, thread_); 3487 other_suspend_ = true; 3488 } 3489 } 3490 } 3491 } 3492 3493 Thread* GetThread() const { 3494 return thread_; 3495 } 3496 3497 JDWP::JdwpError GetError() const { 3498 return error_; 3499 } 3500 3501 ~ScopedThreadSuspension() { 3502 if (other_suspend_) { 3503 Runtime::Current()->GetThreadList()->Resume(thread_, true); 3504 } 3505 } 3506 3507 private: 3508 Thread* thread_; 3509 JDWP::JdwpError error_; 3510 bool self_suspend_; 3511 bool other_suspend_; 3512}; 3513 3514JDWP::JdwpError Dbg::ConfigureStep(JDWP::ObjectId thread_id, JDWP::JdwpStepSize step_size, 3515 JDWP::JdwpStepDepth step_depth) { 3516 Thread* self = Thread::Current(); 3517 ScopedThreadSuspension sts(self, thread_id); 3518 if (sts.GetError() != JDWP::ERR_NONE) { 3519 return sts.GetError(); 3520 } 3521 3522 // Work out what ArtMethod* we're in, the current line number, and how deep the stack currently 3523 // is for step-out. 3524 struct SingleStepStackVisitor : public StackVisitor { 3525 explicit SingleStepStackVisitor(Thread* thread) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 3526 : StackVisitor(thread, nullptr), stack_depth(0), method(nullptr), line_number(-1) { 3527 } 3528 3529 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 3530 // annotalysis. 3531 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 3532 mirror::ArtMethod* m = GetMethod(); 3533 if (!m->IsRuntimeMethod()) { 3534 ++stack_depth; 3535 if (method == nullptr) { 3536 mirror::DexCache* dex_cache = m->GetDeclaringClass()->GetDexCache(); 3537 method = m; 3538 if (dex_cache != nullptr) { 3539 const DexFile& dex_file = *dex_cache->GetDexFile(); 3540 line_number = dex_file.GetLineNumFromPC(m, GetDexPc()); 3541 } 3542 } 3543 } 3544 return true; 3545 } 3546 3547 int stack_depth; 3548 mirror::ArtMethod* method; 3549 int32_t line_number; 3550 }; 3551 3552 Thread* const thread = sts.GetThread(); 3553 SingleStepStackVisitor visitor(thread); 3554 visitor.WalkStack(); 3555 3556 // Find the dex_pc values that correspond to the current line, for line-based single-stepping. 3557 struct DebugCallbackContext { 3558 explicit DebugCallbackContext(SingleStepControl* single_step_control_cb, 3559 int32_t line_number_cb, const DexFile::CodeItem* code_item) 3560 : single_step_control_(single_step_control_cb), line_number_(line_number_cb), 3561 code_item_(code_item), last_pc_valid(false), last_pc(0) { 3562 } 3563 3564 static bool Callback(void* raw_context, uint32_t address, uint32_t line_number_cb) { 3565 DebugCallbackContext* context = reinterpret_cast<DebugCallbackContext*>(raw_context); 3566 if (static_cast<int32_t>(line_number_cb) == context->line_number_) { 3567 if (!context->last_pc_valid) { 3568 // Everything from this address until the next line change is ours. 3569 context->last_pc = address; 3570 context->last_pc_valid = true; 3571 } 3572 // Otherwise, if we're already in a valid range for this line, 3573 // just keep going (shouldn't really happen)... 3574 } else if (context->last_pc_valid) { // and the line number is new 3575 // Add everything from the last entry up until here to the set 3576 for (uint32_t dex_pc = context->last_pc; dex_pc < address; ++dex_pc) { 3577 context->single_step_control_->AddDexPc(dex_pc); 3578 } 3579 context->last_pc_valid = false; 3580 } 3581 return false; // There may be multiple entries for any given line. 3582 } 3583 3584 ~DebugCallbackContext() { 3585 // If the line number was the last in the position table... 3586 if (last_pc_valid) { 3587 size_t end = code_item_->insns_size_in_code_units_; 3588 for (uint32_t dex_pc = last_pc; dex_pc < end; ++dex_pc) { 3589 single_step_control_->AddDexPc(dex_pc); 3590 } 3591 } 3592 } 3593 3594 SingleStepControl* const single_step_control_; 3595 const int32_t line_number_; 3596 const DexFile::CodeItem* const code_item_; 3597 bool last_pc_valid; 3598 uint32_t last_pc; 3599 }; 3600 3601 // Allocate single step. 3602 SingleStepControl* single_step_control = 3603 new (std::nothrow) SingleStepControl(step_size, step_depth, 3604 visitor.stack_depth, visitor.method); 3605 if (single_step_control == nullptr) { 3606 LOG(ERROR) << "Failed to allocate SingleStepControl"; 3607 return JDWP::ERR_OUT_OF_MEMORY; 3608 } 3609 3610 mirror::ArtMethod* m = single_step_control->GetMethod(); 3611 const int32_t line_number = visitor.line_number; 3612 if (!m->IsNative()) { 3613 const DexFile::CodeItem* const code_item = m->GetCodeItem(); 3614 DebugCallbackContext context(single_step_control, line_number, code_item); 3615 m->GetDexFile()->DecodeDebugInfo(code_item, m->IsStatic(), m->GetDexMethodIndex(), 3616 DebugCallbackContext::Callback, nullptr, &context); 3617 } 3618 3619 // Activate single-step in the thread. 3620 thread->ActivateSingleStepControl(single_step_control); 3621 3622 if (VLOG_IS_ON(jdwp)) { 3623 VLOG(jdwp) << "Single-step thread: " << *thread; 3624 VLOG(jdwp) << "Single-step step size: " << single_step_control->GetStepSize(); 3625 VLOG(jdwp) << "Single-step step depth: " << single_step_control->GetStepDepth(); 3626 VLOG(jdwp) << "Single-step current method: " << PrettyMethod(single_step_control->GetMethod()); 3627 VLOG(jdwp) << "Single-step current line: " << line_number; 3628 VLOG(jdwp) << "Single-step current stack depth: " << single_step_control->GetStackDepth(); 3629 VLOG(jdwp) << "Single-step dex_pc values:"; 3630 for (uint32_t dex_pc : single_step_control->GetDexPcs()) { 3631 VLOG(jdwp) << StringPrintf(" %#x", dex_pc); 3632 } 3633 } 3634 3635 return JDWP::ERR_NONE; 3636} 3637 3638void Dbg::UnconfigureStep(JDWP::ObjectId thread_id) { 3639 ScopedObjectAccessUnchecked soa(Thread::Current()); 3640 JDWP::JdwpError error; 3641 Thread* thread = DecodeThread(soa, thread_id, &error); 3642 if (error == JDWP::ERR_NONE) { 3643 thread->DeactivateSingleStepControl(); 3644 } 3645} 3646 3647static char JdwpTagToShortyChar(JDWP::JdwpTag tag) { 3648 switch (tag) { 3649 default: 3650 LOG(FATAL) << "unknown JDWP tag: " << PrintableChar(tag); 3651 UNREACHABLE(); 3652 3653 // Primitives. 3654 case JDWP::JT_BYTE: return 'B'; 3655 case JDWP::JT_CHAR: return 'C'; 3656 case JDWP::JT_FLOAT: return 'F'; 3657 case JDWP::JT_DOUBLE: return 'D'; 3658 case JDWP::JT_INT: return 'I'; 3659 case JDWP::JT_LONG: return 'J'; 3660 case JDWP::JT_SHORT: return 'S'; 3661 case JDWP::JT_VOID: return 'V'; 3662 case JDWP::JT_BOOLEAN: return 'Z'; 3663 3664 // Reference types. 3665 case JDWP::JT_ARRAY: 3666 case JDWP::JT_OBJECT: 3667 case JDWP::JT_STRING: 3668 case JDWP::JT_THREAD: 3669 case JDWP::JT_THREAD_GROUP: 3670 case JDWP::JT_CLASS_LOADER: 3671 case JDWP::JT_CLASS_OBJECT: 3672 return 'L'; 3673 } 3674} 3675 3676JDWP::JdwpError Dbg::InvokeMethod(JDWP::ObjectId thread_id, JDWP::ObjectId object_id, 3677 JDWP::RefTypeId class_id, JDWP::MethodId method_id, 3678 uint32_t arg_count, uint64_t* arg_values, 3679 JDWP::JdwpTag* arg_types, uint32_t options, 3680 JDWP::JdwpTag* pResultTag, uint64_t* pResultValue, 3681 JDWP::ObjectId* pExceptionId) { 3682 ThreadList* thread_list = Runtime::Current()->GetThreadList(); 3683 3684 Thread* targetThread = nullptr; 3685 std::unique_ptr<DebugInvokeReq> req; 3686 Thread* self = Thread::Current(); 3687 { 3688 ScopedObjectAccessUnchecked soa(self); 3689 JDWP::JdwpError error; 3690 targetThread = DecodeThread(soa, thread_id, &error); 3691 if (error != JDWP::ERR_NONE) { 3692 LOG(ERROR) << "InvokeMethod request for invalid thread id " << thread_id; 3693 return error; 3694 } 3695 if (targetThread->GetInvokeReq() != nullptr) { 3696 // Thread is already invoking a method on behalf of the debugger. 3697 LOG(ERROR) << "InvokeMethod request for thread already invoking a method: " << *targetThread; 3698 return JDWP::ERR_ALREADY_INVOKING; 3699 } 3700 if (!targetThread->IsReadyForDebugInvoke()) { 3701 // Thread is not suspended by an event so it cannot invoke a method. 3702 LOG(ERROR) << "InvokeMethod request for thread not stopped by event: " << *targetThread; 3703 return JDWP::ERR_INVALID_THREAD; 3704 } 3705 3706 /* 3707 * We currently have a bug where we don't successfully resume the 3708 * target thread if the suspend count is too deep. We're expected to 3709 * require one "resume" for each "suspend", but when asked to execute 3710 * a method we have to resume fully and then re-suspend it back to the 3711 * same level. (The easiest way to cause this is to type "suspend" 3712 * multiple times in jdb.) 3713 * 3714 * It's unclear what this means when the event specifies "resume all" 3715 * and some threads are suspended more deeply than others. This is 3716 * a rare problem, so for now we just prevent it from hanging forever 3717 * by rejecting the method invocation request. Without this, we will 3718 * be stuck waiting on a suspended thread. 3719 */ 3720 int suspend_count; 3721 { 3722 MutexLock mu2(soa.Self(), *Locks::thread_suspend_count_lock_); 3723 suspend_count = targetThread->GetSuspendCount(); 3724 } 3725 if (suspend_count > 1) { 3726 LOG(ERROR) << *targetThread << " suspend count too deep for method invocation: " << suspend_count; 3727 return JDWP::ERR_THREAD_SUSPENDED; // Probably not expected here. 3728 } 3729 3730 mirror::Object* receiver = gRegistry->Get<mirror::Object*>(object_id, &error); 3731 if (error != JDWP::ERR_NONE) { 3732 return JDWP::ERR_INVALID_OBJECT; 3733 } 3734 3735 gRegistry->Get<mirror::Object*>(thread_id, &error); 3736 if (error != JDWP::ERR_NONE) { 3737 return JDWP::ERR_INVALID_OBJECT; 3738 } 3739 3740 mirror::Class* c = DecodeClass(class_id, &error); 3741 if (c == nullptr) { 3742 return error; 3743 } 3744 3745 mirror::ArtMethod* m = FromMethodId(method_id); 3746 if (m->IsStatic() != (receiver == nullptr)) { 3747 return JDWP::ERR_INVALID_METHODID; 3748 } 3749 if (m->IsStatic()) { 3750 if (m->GetDeclaringClass() != c) { 3751 return JDWP::ERR_INVALID_METHODID; 3752 } 3753 } else { 3754 if (!m->GetDeclaringClass()->IsAssignableFrom(c)) { 3755 return JDWP::ERR_INVALID_METHODID; 3756 } 3757 } 3758 3759 // Check the argument list matches the method. 3760 uint32_t shorty_len = 0; 3761 const char* shorty = m->GetShorty(&shorty_len); 3762 if (shorty_len - 1 != arg_count) { 3763 return JDWP::ERR_ILLEGAL_ARGUMENT; 3764 } 3765 3766 { 3767 StackHandleScope<3> hs(soa.Self()); 3768 HandleWrapper<mirror::ArtMethod> h_m(hs.NewHandleWrapper(&m)); 3769 HandleWrapper<mirror::Object> h_obj(hs.NewHandleWrapper(&receiver)); 3770 HandleWrapper<mirror::Class> h_klass(hs.NewHandleWrapper(&c)); 3771 const DexFile::TypeList* types = m->GetParameterTypeList(); 3772 for (size_t i = 0; i < arg_count; ++i) { 3773 if (shorty[i + 1] != JdwpTagToShortyChar(arg_types[i])) { 3774 return JDWP::ERR_ILLEGAL_ARGUMENT; 3775 } 3776 3777 if (shorty[i + 1] == 'L') { 3778 // Did we really get an argument of an appropriate reference type? 3779 mirror::Class* parameter_type = 3780 h_m->GetClassFromTypeIndex(types->GetTypeItem(i).type_idx_, true); 3781 mirror::Object* argument = gRegistry->Get<mirror::Object*>(arg_values[i], &error); 3782 if (error != JDWP::ERR_NONE) { 3783 return JDWP::ERR_INVALID_OBJECT; 3784 } 3785 if (argument != nullptr && !argument->InstanceOf(parameter_type)) { 3786 return JDWP::ERR_ILLEGAL_ARGUMENT; 3787 } 3788 3789 // Turn the on-the-wire ObjectId into a jobject. 3790 jvalue& v = reinterpret_cast<jvalue&>(arg_values[i]); 3791 v.l = gRegistry->GetJObject(arg_values[i]); 3792 } 3793 } 3794 } 3795 3796 // Allocates a DebugInvokeReq. 3797 req.reset(new (std::nothrow) DebugInvokeReq(receiver, c, m, options, arg_values, arg_count)); 3798 if (req.get() == nullptr) { 3799 LOG(ERROR) << "Failed to allocate DebugInvokeReq"; 3800 return JDWP::ERR_OUT_OF_MEMORY; 3801 } 3802 3803 // Attach the DebugInvokeReq to the target thread so it executes the method when 3804 // it is resumed. Once the invocation completes, it will detach it and signal us 3805 // before suspending itself. 3806 targetThread->SetDebugInvokeReq(req.get()); 3807 } 3808 3809 // The fact that we've released the thread list lock is a bit risky --- if the thread goes 3810 // away we're sitting high and dry -- but we must release this before the ResumeAllThreads 3811 // call, and it's unwise to hold it during WaitForSuspend. 3812 3813 { 3814 /* 3815 * We change our (JDWP thread) status, which should be THREAD_RUNNING, 3816 * so we can suspend for a GC if the invoke request causes us to 3817 * run out of memory. It's also a good idea to change it before locking 3818 * the invokeReq mutex, although that should never be held for long. 3819 */ 3820 self->TransitionFromRunnableToSuspended(kWaitingForDebuggerSend); 3821 3822 VLOG(jdwp) << " Transferring control to event thread"; 3823 { 3824 MutexLock mu(self, req->lock); 3825 3826 if ((options & JDWP::INVOKE_SINGLE_THREADED) == 0) { 3827 VLOG(jdwp) << " Resuming all threads"; 3828 thread_list->UndoDebuggerSuspensions(); 3829 } else { 3830 VLOG(jdwp) << " Resuming event thread only"; 3831 thread_list->Resume(targetThread, true); 3832 } 3833 3834 // The target thread is resumed but needs the JDWP token we're holding. 3835 // We release it now and will acquire it again when the invocation is 3836 // complete and the target thread suspends itself. 3837 gJdwpState->ReleaseJdwpTokenForCommand(); 3838 3839 // Wait for the request to finish executing. 3840 while (targetThread->GetInvokeReq() != nullptr) { 3841 req->cond.Wait(self); 3842 } 3843 } 3844 VLOG(jdwp) << " Control has returned from event thread"; 3845 3846 /* wait for thread to re-suspend itself */ 3847 SuspendThread(thread_id, false /* request_suspension */); 3848 3849 // Now the thread is suspended again, we can re-acquire the JDWP token. 3850 gJdwpState->AcquireJdwpTokenForCommand(); 3851 3852 self->TransitionFromSuspendedToRunnable(); 3853 } 3854 3855 /* 3856 * Suspend the threads. We waited for the target thread to suspend 3857 * itself, so all we need to do is suspend the others. 3858 * 3859 * The SuspendAllForDebugger() call will double-suspend the event thread, 3860 * so we want to resume the target thread once to keep the books straight. 3861 */ 3862 if ((options & JDWP::INVOKE_SINGLE_THREADED) == 0) { 3863 self->TransitionFromRunnableToSuspended(kWaitingForDebuggerSuspension); 3864 VLOG(jdwp) << " Suspending all threads"; 3865 thread_list->SuspendAllForDebugger(); 3866 self->TransitionFromSuspendedToRunnable(); 3867 VLOG(jdwp) << " Resuming event thread to balance the count"; 3868 thread_list->Resume(targetThread, true); 3869 } 3870 3871 // Copy the result. 3872 *pResultTag = req->result_tag; 3873 *pResultValue = req->result_value; 3874 *pExceptionId = req->exception; 3875 return req->error; 3876} 3877 3878void Dbg::ExecuteMethod(DebugInvokeReq* pReq) { 3879 ScopedObjectAccess soa(Thread::Current()); 3880 3881 // We can be called while an exception is pending. We need 3882 // to preserve that across the method invocation. 3883 StackHandleScope<4> hs(soa.Self()); 3884 auto old_exception = hs.NewHandle<mirror::Throwable>(soa.Self()->GetException()); 3885 soa.Self()->ClearException(); 3886 3887 // Translate the method through the vtable, unless the debugger wants to suppress it. 3888 MutableHandle<mirror::ArtMethod> m(hs.NewHandle(pReq->method.Read())); 3889 if ((pReq->options & JDWP::INVOKE_NONVIRTUAL) == 0 && pReq->receiver.Read() != nullptr) { 3890 mirror::ArtMethod* actual_method = pReq->klass.Read()->FindVirtualMethodForVirtualOrInterface(m.Get()); 3891 if (actual_method != m.Get()) { 3892 VLOG(jdwp) << "ExecuteMethod translated " << PrettyMethod(m.Get()) 3893 << " to " << PrettyMethod(actual_method); 3894 m.Assign(actual_method); 3895 } 3896 } 3897 VLOG(jdwp) << "ExecuteMethod " << PrettyMethod(m.Get()) 3898 << " receiver=" << pReq->receiver.Read() 3899 << " arg_count=" << pReq->arg_count; 3900 CHECK(m.Get() != nullptr); 3901 3902 CHECK_EQ(sizeof(jvalue), sizeof(uint64_t)); 3903 3904 JValue result = InvokeWithJValues(soa, pReq->receiver.Read(), soa.EncodeMethod(m.Get()), 3905 reinterpret_cast<jvalue*>(pReq->arg_values)); 3906 3907 pReq->result_tag = BasicTagFromDescriptor(m.Get()->GetShorty()); 3908 const bool is_object_result = (pReq->result_tag == JDWP::JT_OBJECT); 3909 Handle<mirror::Object> object_result = hs.NewHandle(is_object_result ? result.GetL() : nullptr); 3910 Handle<mirror::Throwable> exception = hs.NewHandle(soa.Self()->GetException()); 3911 soa.Self()->ClearException(); 3912 pReq->exception = gRegistry->Add(exception.Get()); 3913 if (pReq->exception != 0) { 3914 VLOG(jdwp) << " JDWP invocation returning with exception=" << exception.Get() 3915 << " " << exception->Dump(); 3916 pReq->result_value = 0; 3917 } else if (is_object_result) { 3918 /* if no exception thrown, examine object result more closely */ 3919 JDWP::JdwpTag new_tag = TagFromObject(soa, object_result.Get()); 3920 if (new_tag != pReq->result_tag) { 3921 VLOG(jdwp) << " JDWP promoted result from " << pReq->result_tag << " to " << new_tag; 3922 pReq->result_tag = new_tag; 3923 } 3924 3925 // Register the object in the registry and reference its ObjectId. This ensures 3926 // GC safety and prevents from accessing stale reference if the object is moved. 3927 pReq->result_value = gRegistry->Add(object_result.Get()); 3928 } else { 3929 // Primitive result. 3930 DCHECK(IsPrimitiveTag(pReq->result_tag)); 3931 pReq->result_value = result.GetJ(); 3932 } 3933 3934 if (old_exception.Get() != nullptr) { 3935 soa.Self()->SetException(old_exception.Get()); 3936 } 3937} 3938 3939/* 3940 * "request" contains a full JDWP packet, possibly with multiple chunks. We 3941 * need to process each, accumulate the replies, and ship the whole thing 3942 * back. 3943 * 3944 * Returns "true" if we have a reply. The reply buffer is newly allocated, 3945 * and includes the chunk type/length, followed by the data. 3946 * 3947 * OLD-TODO: we currently assume that the request and reply include a single 3948 * chunk. If this becomes inconvenient we will need to adapt. 3949 */ 3950bool Dbg::DdmHandlePacket(JDWP::Request* request, uint8_t** pReplyBuf, int* pReplyLen) { 3951 Thread* self = Thread::Current(); 3952 JNIEnv* env = self->GetJniEnv(); 3953 3954 uint32_t type = request->ReadUnsigned32("type"); 3955 uint32_t length = request->ReadUnsigned32("length"); 3956 3957 // Create a byte[] corresponding to 'request'. 3958 size_t request_length = request->size(); 3959 ScopedLocalRef<jbyteArray> dataArray(env, env->NewByteArray(request_length)); 3960 if (dataArray.get() == nullptr) { 3961 LOG(WARNING) << "byte[] allocation failed: " << request_length; 3962 env->ExceptionClear(); 3963 return false; 3964 } 3965 env->SetByteArrayRegion(dataArray.get(), 0, request_length, 3966 reinterpret_cast<const jbyte*>(request->data())); 3967 request->Skip(request_length); 3968 3969 // Run through and find all chunks. [Currently just find the first.] 3970 ScopedByteArrayRO contents(env, dataArray.get()); 3971 if (length != request_length) { 3972 LOG(WARNING) << StringPrintf("bad chunk found (len=%u pktLen=%zd)", length, request_length); 3973 return false; 3974 } 3975 3976 // Call "private static Chunk dispatch(int type, byte[] data, int offset, int length)". 3977 ScopedLocalRef<jobject> chunk(env, env->CallStaticObjectMethod(WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer, 3978 WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer_dispatch, 3979 type, dataArray.get(), 0, length)); 3980 if (env->ExceptionCheck()) { 3981 LOG(INFO) << StringPrintf("Exception thrown by dispatcher for 0x%08x", type); 3982 env->ExceptionDescribe(); 3983 env->ExceptionClear(); 3984 return false; 3985 } 3986 3987 if (chunk.get() == nullptr) { 3988 return false; 3989 } 3990 3991 /* 3992 * Pull the pieces out of the chunk. We copy the results into a 3993 * newly-allocated buffer that the caller can free. We don't want to 3994 * continue using the Chunk object because nothing has a reference to it. 3995 * 3996 * We could avoid this by returning type/data/offset/length and having 3997 * the caller be aware of the object lifetime issues, but that 3998 * integrates the JDWP code more tightly into the rest of the runtime, and doesn't work 3999 * if we have responses for multiple chunks. 4000 * 4001 * So we're pretty much stuck with copying data around multiple times. 4002 */ 4003 ScopedLocalRef<jbyteArray> replyData(env, reinterpret_cast<jbyteArray>(env->GetObjectField(chunk.get(), WellKnownClasses::org_apache_harmony_dalvik_ddmc_Chunk_data))); 4004 jint offset = env->GetIntField(chunk.get(), WellKnownClasses::org_apache_harmony_dalvik_ddmc_Chunk_offset); 4005 length = env->GetIntField(chunk.get(), WellKnownClasses::org_apache_harmony_dalvik_ddmc_Chunk_length); 4006 type = env->GetIntField(chunk.get(), WellKnownClasses::org_apache_harmony_dalvik_ddmc_Chunk_type); 4007 4008 VLOG(jdwp) << StringPrintf("DDM reply: type=0x%08x data=%p offset=%d length=%d", type, replyData.get(), offset, length); 4009 if (length == 0 || replyData.get() == nullptr) { 4010 return false; 4011 } 4012 4013 const int kChunkHdrLen = 8; 4014 uint8_t* reply = new uint8_t[length + kChunkHdrLen]; 4015 if (reply == nullptr) { 4016 LOG(WARNING) << "malloc failed: " << (length + kChunkHdrLen); 4017 return false; 4018 } 4019 JDWP::Set4BE(reply + 0, type); 4020 JDWP::Set4BE(reply + 4, length); 4021 env->GetByteArrayRegion(replyData.get(), offset, length, reinterpret_cast<jbyte*>(reply + kChunkHdrLen)); 4022 4023 *pReplyBuf = reply; 4024 *pReplyLen = length + kChunkHdrLen; 4025 4026 VLOG(jdwp) << StringPrintf("dvmHandleDdm returning type=%.4s %p len=%d", reinterpret_cast<char*>(reply), reply, length); 4027 return true; 4028} 4029 4030void Dbg::DdmBroadcast(bool connect) { 4031 VLOG(jdwp) << "Broadcasting DDM " << (connect ? "connect" : "disconnect") << "..."; 4032 4033 Thread* self = Thread::Current(); 4034 if (self->GetState() != kRunnable) { 4035 LOG(ERROR) << "DDM broadcast in thread state " << self->GetState(); 4036 /* try anyway? */ 4037 } 4038 4039 JNIEnv* env = self->GetJniEnv(); 4040 jint event = connect ? 1 /*DdmServer.CONNECTED*/ : 2 /*DdmServer.DISCONNECTED*/; 4041 env->CallStaticVoidMethod(WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer, 4042 WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer_broadcast, 4043 event); 4044 if (env->ExceptionCheck()) { 4045 LOG(ERROR) << "DdmServer.broadcast " << event << " failed"; 4046 env->ExceptionDescribe(); 4047 env->ExceptionClear(); 4048 } 4049} 4050 4051void Dbg::DdmConnected() { 4052 Dbg::DdmBroadcast(true); 4053} 4054 4055void Dbg::DdmDisconnected() { 4056 Dbg::DdmBroadcast(false); 4057 gDdmThreadNotification = false; 4058} 4059 4060/* 4061 * Send a notification when a thread starts, stops, or changes its name. 4062 * 4063 * Because we broadcast the full set of threads when the notifications are 4064 * first enabled, it's possible for "thread" to be actively executing. 4065 */ 4066void Dbg::DdmSendThreadNotification(Thread* t, uint32_t type) { 4067 if (!gDdmThreadNotification) { 4068 return; 4069 } 4070 4071 if (type == CHUNK_TYPE("THDE")) { 4072 uint8_t buf[4]; 4073 JDWP::Set4BE(&buf[0], t->GetThreadId()); 4074 Dbg::DdmSendChunk(CHUNK_TYPE("THDE"), 4, buf); 4075 } else { 4076 CHECK(type == CHUNK_TYPE("THCR") || type == CHUNK_TYPE("THNM")) << type; 4077 ScopedObjectAccessUnchecked soa(Thread::Current()); 4078 StackHandleScope<1> hs(soa.Self()); 4079 Handle<mirror::String> name(hs.NewHandle(t->GetThreadName(soa))); 4080 size_t char_count = (name.Get() != nullptr) ? name->GetLength() : 0; 4081 const jchar* chars = (name.Get() != nullptr) ? name->GetCharArray()->GetData() : nullptr; 4082 4083 std::vector<uint8_t> bytes; 4084 JDWP::Append4BE(bytes, t->GetThreadId()); 4085 JDWP::AppendUtf16BE(bytes, chars, char_count); 4086 CHECK_EQ(bytes.size(), char_count*2 + sizeof(uint32_t)*2); 4087 Dbg::DdmSendChunk(type, bytes); 4088 } 4089} 4090 4091void Dbg::DdmSetThreadNotification(bool enable) { 4092 // Enable/disable thread notifications. 4093 gDdmThreadNotification = enable; 4094 if (enable) { 4095 // Suspend the VM then post thread start notifications for all threads. Threads attaching will 4096 // see a suspension in progress and block until that ends. They then post their own start 4097 // notification. 4098 SuspendVM(); 4099 std::list<Thread*> threads; 4100 Thread* self = Thread::Current(); 4101 { 4102 MutexLock mu(self, *Locks::thread_list_lock_); 4103 threads = Runtime::Current()->GetThreadList()->GetList(); 4104 } 4105 { 4106 ScopedObjectAccess soa(self); 4107 for (Thread* thread : threads) { 4108 Dbg::DdmSendThreadNotification(thread, CHUNK_TYPE("THCR")); 4109 } 4110 } 4111 ResumeVM(); 4112 } 4113} 4114 4115void Dbg::PostThreadStartOrStop(Thread* t, uint32_t type) { 4116 if (IsDebuggerActive()) { 4117 gJdwpState->PostThreadChange(t, type == CHUNK_TYPE("THCR")); 4118 } 4119 Dbg::DdmSendThreadNotification(t, type); 4120} 4121 4122void Dbg::PostThreadStart(Thread* t) { 4123 Dbg::PostThreadStartOrStop(t, CHUNK_TYPE("THCR")); 4124} 4125 4126void Dbg::PostThreadDeath(Thread* t) { 4127 Dbg::PostThreadStartOrStop(t, CHUNK_TYPE("THDE")); 4128} 4129 4130void Dbg::DdmSendChunk(uint32_t type, size_t byte_count, const uint8_t* buf) { 4131 CHECK(buf != nullptr); 4132 iovec vec[1]; 4133 vec[0].iov_base = reinterpret_cast<void*>(const_cast<uint8_t*>(buf)); 4134 vec[0].iov_len = byte_count; 4135 Dbg::DdmSendChunkV(type, vec, 1); 4136} 4137 4138void Dbg::DdmSendChunk(uint32_t type, const std::vector<uint8_t>& bytes) { 4139 DdmSendChunk(type, bytes.size(), &bytes[0]); 4140} 4141 4142void Dbg::DdmSendChunkV(uint32_t type, const iovec* iov, int iov_count) { 4143 if (gJdwpState == nullptr) { 4144 VLOG(jdwp) << "Debugger thread not active, ignoring DDM send: " << type; 4145 } else { 4146 gJdwpState->DdmSendChunkV(type, iov, iov_count); 4147 } 4148} 4149 4150JDWP::JdwpState* Dbg::GetJdwpState() { 4151 return gJdwpState; 4152} 4153 4154int Dbg::DdmHandleHpifChunk(HpifWhen when) { 4155 if (when == HPIF_WHEN_NOW) { 4156 DdmSendHeapInfo(when); 4157 return true; 4158 } 4159 4160 if (when != HPIF_WHEN_NEVER && when != HPIF_WHEN_NEXT_GC && when != HPIF_WHEN_EVERY_GC) { 4161 LOG(ERROR) << "invalid HpifWhen value: " << static_cast<int>(when); 4162 return false; 4163 } 4164 4165 gDdmHpifWhen = when; 4166 return true; 4167} 4168 4169bool Dbg::DdmHandleHpsgNhsgChunk(Dbg::HpsgWhen when, Dbg::HpsgWhat what, bool native) { 4170 if (when != HPSG_WHEN_NEVER && when != HPSG_WHEN_EVERY_GC) { 4171 LOG(ERROR) << "invalid HpsgWhen value: " << static_cast<int>(when); 4172 return false; 4173 } 4174 4175 if (what != HPSG_WHAT_MERGED_OBJECTS && what != HPSG_WHAT_DISTINCT_OBJECTS) { 4176 LOG(ERROR) << "invalid HpsgWhat value: " << static_cast<int>(what); 4177 return false; 4178 } 4179 4180 if (native) { 4181 gDdmNhsgWhen = when; 4182 gDdmNhsgWhat = what; 4183 } else { 4184 gDdmHpsgWhen = when; 4185 gDdmHpsgWhat = what; 4186 } 4187 return true; 4188} 4189 4190void Dbg::DdmSendHeapInfo(HpifWhen reason) { 4191 // If there's a one-shot 'when', reset it. 4192 if (reason == gDdmHpifWhen) { 4193 if (gDdmHpifWhen == HPIF_WHEN_NEXT_GC) { 4194 gDdmHpifWhen = HPIF_WHEN_NEVER; 4195 } 4196 } 4197 4198 /* 4199 * Chunk HPIF (client --> server) 4200 * 4201 * Heap Info. General information about the heap, 4202 * suitable for a summary display. 4203 * 4204 * [u4]: number of heaps 4205 * 4206 * For each heap: 4207 * [u4]: heap ID 4208 * [u8]: timestamp in ms since Unix epoch 4209 * [u1]: capture reason (same as 'when' value from server) 4210 * [u4]: max heap size in bytes (-Xmx) 4211 * [u4]: current heap size in bytes 4212 * [u4]: current number of bytes allocated 4213 * [u4]: current number of objects allocated 4214 */ 4215 uint8_t heap_count = 1; 4216 gc::Heap* heap = Runtime::Current()->GetHeap(); 4217 std::vector<uint8_t> bytes; 4218 JDWP::Append4BE(bytes, heap_count); 4219 JDWP::Append4BE(bytes, 1); // Heap id (bogus; we only have one heap). 4220 JDWP::Append8BE(bytes, MilliTime()); 4221 JDWP::Append1BE(bytes, reason); 4222 JDWP::Append4BE(bytes, heap->GetMaxMemory()); // Max allowed heap size in bytes. 4223 JDWP::Append4BE(bytes, heap->GetTotalMemory()); // Current heap size in bytes. 4224 JDWP::Append4BE(bytes, heap->GetBytesAllocated()); 4225 JDWP::Append4BE(bytes, heap->GetObjectsAllocated()); 4226 CHECK_EQ(bytes.size(), 4U + (heap_count * (4 + 8 + 1 + 4 + 4 + 4 + 4))); 4227 Dbg::DdmSendChunk(CHUNK_TYPE("HPIF"), bytes); 4228} 4229 4230enum HpsgSolidity { 4231 SOLIDITY_FREE = 0, 4232 SOLIDITY_HARD = 1, 4233 SOLIDITY_SOFT = 2, 4234 SOLIDITY_WEAK = 3, 4235 SOLIDITY_PHANTOM = 4, 4236 SOLIDITY_FINALIZABLE = 5, 4237 SOLIDITY_SWEEP = 6, 4238}; 4239 4240enum HpsgKind { 4241 KIND_OBJECT = 0, 4242 KIND_CLASS_OBJECT = 1, 4243 KIND_ARRAY_1 = 2, 4244 KIND_ARRAY_2 = 3, 4245 KIND_ARRAY_4 = 4, 4246 KIND_ARRAY_8 = 5, 4247 KIND_UNKNOWN = 6, 4248 KIND_NATIVE = 7, 4249}; 4250 4251#define HPSG_PARTIAL (1<<7) 4252#define HPSG_STATE(solidity, kind) ((uint8_t)((((kind) & 0x7) << 3) | ((solidity) & 0x7))) 4253 4254class HeapChunkContext { 4255 public: 4256 // Maximum chunk size. Obtain this from the formula: 4257 // (((maximum_heap_size / ALLOCATION_UNIT_SIZE) + 255) / 256) * 2 4258 HeapChunkContext(bool merge, bool native) 4259 : buf_(16384 - 16), 4260 type_(0), 4261 chunk_overhead_(0) { 4262 Reset(); 4263 if (native) { 4264 type_ = CHUNK_TYPE("NHSG"); 4265 } else { 4266 type_ = merge ? CHUNK_TYPE("HPSG") : CHUNK_TYPE("HPSO"); 4267 } 4268 } 4269 4270 ~HeapChunkContext() { 4271 if (p_ > &buf_[0]) { 4272 Flush(); 4273 } 4274 } 4275 4276 void SetChunkOverhead(size_t chunk_overhead) { 4277 chunk_overhead_ = chunk_overhead; 4278 } 4279 4280 void ResetStartOfNextChunk() { 4281 startOfNextMemoryChunk_ = nullptr; 4282 } 4283 4284 void EnsureHeader(const void* chunk_ptr) { 4285 if (!needHeader_) { 4286 return; 4287 } 4288 4289 // Start a new HPSx chunk. 4290 JDWP::Write4BE(&p_, 1); // Heap id (bogus; we only have one heap). 4291 JDWP::Write1BE(&p_, 8); // Size of allocation unit, in bytes. 4292 4293 JDWP::Write4BE(&p_, reinterpret_cast<uintptr_t>(chunk_ptr)); // virtual address of segment start. 4294 JDWP::Write4BE(&p_, 0); // offset of this piece (relative to the virtual address). 4295 // [u4]: length of piece, in allocation units 4296 // We won't know this until we're done, so save the offset and stuff in a dummy value. 4297 pieceLenField_ = p_; 4298 JDWP::Write4BE(&p_, 0x55555555); 4299 needHeader_ = false; 4300 } 4301 4302 void Flush() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4303 if (pieceLenField_ == nullptr) { 4304 // Flush immediately post Reset (maybe back-to-back Flush). Ignore. 4305 CHECK(needHeader_); 4306 return; 4307 } 4308 // Patch the "length of piece" field. 4309 CHECK_LE(&buf_[0], pieceLenField_); 4310 CHECK_LE(pieceLenField_, p_); 4311 JDWP::Set4BE(pieceLenField_, totalAllocationUnits_); 4312 4313 Dbg::DdmSendChunk(type_, p_ - &buf_[0], &buf_[0]); 4314 Reset(); 4315 } 4316 4317 static void HeapChunkJavaCallback(void* start, void* end, size_t used_bytes, void* arg) 4318 SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, 4319 Locks::mutator_lock_) { 4320 reinterpret_cast<HeapChunkContext*>(arg)->HeapChunkJavaCallback(start, end, used_bytes); 4321 } 4322 4323 static void HeapChunkNativeCallback(void* start, void* end, size_t used_bytes, void* arg) 4324 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4325 reinterpret_cast<HeapChunkContext*>(arg)->HeapChunkNativeCallback(start, end, used_bytes); 4326 } 4327 4328 private: 4329 enum { ALLOCATION_UNIT_SIZE = 8 }; 4330 4331 void Reset() { 4332 p_ = &buf_[0]; 4333 ResetStartOfNextChunk(); 4334 totalAllocationUnits_ = 0; 4335 needHeader_ = true; 4336 pieceLenField_ = nullptr; 4337 } 4338 4339 bool IsNative() const { 4340 return type_ == CHUNK_TYPE("NHSG"); 4341 } 4342 4343 // Returns true if the object is not an empty chunk. 4344 bool ProcessRecord(void* start, size_t used_bytes) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4345 // Note: heap call backs cannot manipulate the heap upon which they are crawling, care is taken 4346 // in the following code not to allocate memory, by ensuring buf_ is of the correct size 4347 if (used_bytes == 0) { 4348 if (start == nullptr) { 4349 // Reset for start of new heap. 4350 startOfNextMemoryChunk_ = nullptr; 4351 Flush(); 4352 } 4353 // Only process in use memory so that free region information 4354 // also includes dlmalloc book keeping. 4355 return false; 4356 } 4357 if (startOfNextMemoryChunk_ != nullptr) { 4358 // Transmit any pending free memory. Native free memory of over kMaxFreeLen could be because 4359 // of the use of mmaps, so don't report. If not free memory then start a new segment. 4360 bool flush = true; 4361 if (start > startOfNextMemoryChunk_) { 4362 const size_t kMaxFreeLen = 2 * kPageSize; 4363 void* free_start = startOfNextMemoryChunk_; 4364 void* free_end = start; 4365 const size_t free_len = 4366 reinterpret_cast<uintptr_t>(free_end) - reinterpret_cast<uintptr_t>(free_start); 4367 if (!IsNative() || free_len < kMaxFreeLen) { 4368 AppendChunk(HPSG_STATE(SOLIDITY_FREE, 0), free_start, free_len, IsNative()); 4369 flush = false; 4370 } 4371 } 4372 if (flush) { 4373 startOfNextMemoryChunk_ = nullptr; 4374 Flush(); 4375 } 4376 } 4377 return true; 4378 } 4379 4380 void HeapChunkNativeCallback(void* start, void* /*end*/, size_t used_bytes) 4381 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4382 if (ProcessRecord(start, used_bytes)) { 4383 uint8_t state = ExamineNativeObject(start); 4384 AppendChunk(state, start, used_bytes + chunk_overhead_, true /*is_native*/); 4385 startOfNextMemoryChunk_ = reinterpret_cast<char*>(start) + used_bytes + chunk_overhead_; 4386 } 4387 } 4388 4389 void HeapChunkJavaCallback(void* start, void* /*end*/, size_t used_bytes) 4390 SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { 4391 if (ProcessRecord(start, used_bytes)) { 4392 // Determine the type of this chunk. 4393 // OLD-TODO: if context.merge, see if this chunk is different from the last chunk. 4394 // If it's the same, we should combine them. 4395 uint8_t state = ExamineJavaObject(reinterpret_cast<mirror::Object*>(start)); 4396 AppendChunk(state, start, used_bytes + chunk_overhead_, false /*is_native*/); 4397 startOfNextMemoryChunk_ = reinterpret_cast<char*>(start) + used_bytes + chunk_overhead_; 4398 } 4399 } 4400 4401 void AppendChunk(uint8_t state, void* ptr, size_t length, bool is_native) 4402 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4403 // Make sure there's enough room left in the buffer. 4404 // We need to use two bytes for every fractional 256 allocation units used by the chunk plus 4405 // 17 bytes for any header. 4406 const size_t needed = ((RoundUp(length / ALLOCATION_UNIT_SIZE, 256) / 256) * 2) + 17; 4407 size_t byte_left = &buf_.back() - p_; 4408 if (byte_left < needed) { 4409 if (is_native) { 4410 // Cannot trigger memory allocation while walking native heap. 4411 return; 4412 } 4413 Flush(); 4414 } 4415 4416 byte_left = &buf_.back() - p_; 4417 if (byte_left < needed) { 4418 LOG(WARNING) << "Chunk is too big to transmit (chunk_len=" << length << ", " 4419 << needed << " bytes)"; 4420 return; 4421 } 4422 EnsureHeader(ptr); 4423 // Write out the chunk description. 4424 length /= ALLOCATION_UNIT_SIZE; // Convert to allocation units. 4425 totalAllocationUnits_ += length; 4426 while (length > 256) { 4427 *p_++ = state | HPSG_PARTIAL; 4428 *p_++ = 255; // length - 1 4429 length -= 256; 4430 } 4431 *p_++ = state; 4432 *p_++ = length - 1; 4433 } 4434 4435 uint8_t ExamineNativeObject(const void* p) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4436 return p == nullptr ? HPSG_STATE(SOLIDITY_FREE, 0) : HPSG_STATE(SOLIDITY_HARD, KIND_NATIVE); 4437 } 4438 4439 uint8_t ExamineJavaObject(mirror::Object* o) 4440 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_, Locks::heap_bitmap_lock_) { 4441 if (o == nullptr) { 4442 return HPSG_STATE(SOLIDITY_FREE, 0); 4443 } 4444 // It's an allocated chunk. Figure out what it is. 4445 gc::Heap* heap = Runtime::Current()->GetHeap(); 4446 if (!heap->IsLiveObjectLocked(o)) { 4447 LOG(ERROR) << "Invalid object in managed heap: " << o; 4448 return HPSG_STATE(SOLIDITY_HARD, KIND_NATIVE); 4449 } 4450 mirror::Class* c = o->GetClass(); 4451 if (c == nullptr) { 4452 // The object was probably just created but hasn't been initialized yet. 4453 return HPSG_STATE(SOLIDITY_HARD, KIND_OBJECT); 4454 } 4455 if (!heap->IsValidObjectAddress(c)) { 4456 LOG(ERROR) << "Invalid class for managed heap object: " << o << " " << c; 4457 return HPSG_STATE(SOLIDITY_HARD, KIND_UNKNOWN); 4458 } 4459 if (c->GetClass() == nullptr) { 4460 LOG(ERROR) << "Null class of class " << c << " for object " << o; 4461 return HPSG_STATE(SOLIDITY_HARD, KIND_UNKNOWN); 4462 } 4463 if (c->IsClassClass()) { 4464 return HPSG_STATE(SOLIDITY_HARD, KIND_CLASS_OBJECT); 4465 } 4466 if (c->IsArrayClass()) { 4467 switch (c->GetComponentSize()) { 4468 case 1: return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_1); 4469 case 2: return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_2); 4470 case 4: return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_4); 4471 case 8: return HPSG_STATE(SOLIDITY_HARD, KIND_ARRAY_8); 4472 } 4473 } 4474 return HPSG_STATE(SOLIDITY_HARD, KIND_OBJECT); 4475 } 4476 4477 std::vector<uint8_t> buf_; 4478 uint8_t* p_; 4479 uint8_t* pieceLenField_; 4480 void* startOfNextMemoryChunk_; 4481 size_t totalAllocationUnits_; 4482 uint32_t type_; 4483 bool needHeader_; 4484 size_t chunk_overhead_; 4485 4486 DISALLOW_COPY_AND_ASSIGN(HeapChunkContext); 4487}; 4488 4489static void BumpPointerSpaceCallback(mirror::Object* obj, void* arg) 4490 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { 4491 const size_t size = RoundUp(obj->SizeOf(), kObjectAlignment); 4492 HeapChunkContext::HeapChunkJavaCallback( 4493 obj, reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(obj) + size), size, arg); 4494} 4495 4496void Dbg::DdmSendHeapSegments(bool native) { 4497 Dbg::HpsgWhen when = native ? gDdmNhsgWhen : gDdmHpsgWhen; 4498 Dbg::HpsgWhat what = native ? gDdmNhsgWhat : gDdmHpsgWhat; 4499 if (when == HPSG_WHEN_NEVER) { 4500 return; 4501 } 4502 // Figure out what kind of chunks we'll be sending. 4503 CHECK(what == HPSG_WHAT_MERGED_OBJECTS || what == HPSG_WHAT_DISTINCT_OBJECTS) 4504 << static_cast<int>(what); 4505 4506 // First, send a heap start chunk. 4507 uint8_t heap_id[4]; 4508 JDWP::Set4BE(&heap_id[0], 1); // Heap id (bogus; we only have one heap). 4509 Dbg::DdmSendChunk(native ? CHUNK_TYPE("NHST") : CHUNK_TYPE("HPST"), sizeof(heap_id), heap_id); 4510 Thread* self = Thread::Current(); 4511 Locks::mutator_lock_->AssertSharedHeld(self); 4512 4513 // Send a series of heap segment chunks. 4514 HeapChunkContext context(what == HPSG_WHAT_MERGED_OBJECTS, native); 4515 if (native) { 4516#if defined(HAVE_ANDROID_OS) && defined(USE_DLMALLOC) 4517 dlmalloc_inspect_all(HeapChunkContext::HeapChunkNativeCallback, &context); 4518 HeapChunkContext::HeapChunkNativeCallback(nullptr, nullptr, 0, &context); // Indicate end of a space. 4519#else 4520 UNIMPLEMENTED(WARNING) << "Native heap inspection is only supported with dlmalloc"; 4521#endif 4522 } else { 4523 gc::Heap* heap = Runtime::Current()->GetHeap(); 4524 for (const auto& space : heap->GetContinuousSpaces()) { 4525 if (space->IsDlMallocSpace()) { 4526 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 4527 // dlmalloc's chunk header is 2 * sizeof(size_t), but if the previous chunk is in use for an 4528 // allocation then the first sizeof(size_t) may belong to it. 4529 context.SetChunkOverhead(sizeof(size_t)); 4530 space->AsDlMallocSpace()->Walk(HeapChunkContext::HeapChunkJavaCallback, &context); 4531 } else if (space->IsRosAllocSpace()) { 4532 context.SetChunkOverhead(0); 4533 // Need to acquire the mutator lock before the heap bitmap lock with exclusive access since 4534 // RosAlloc's internal logic doesn't know to release and reacquire the heap bitmap lock. 4535 self->TransitionFromRunnableToSuspended(kSuspended); 4536 ThreadList* tl = Runtime::Current()->GetThreadList(); 4537 tl->SuspendAll(__FUNCTION__); 4538 { 4539 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 4540 space->AsRosAllocSpace()->Walk(HeapChunkContext::HeapChunkJavaCallback, &context); 4541 } 4542 tl->ResumeAll(); 4543 self->TransitionFromSuspendedToRunnable(); 4544 } else if (space->IsBumpPointerSpace()) { 4545 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 4546 context.SetChunkOverhead(0); 4547 space->AsBumpPointerSpace()->Walk(BumpPointerSpaceCallback, &context); 4548 HeapChunkContext::HeapChunkJavaCallback(nullptr, nullptr, 0, &context); 4549 } else if (space->IsRegionSpace()) { 4550 heap->IncrementDisableMovingGC(self); 4551 self->TransitionFromRunnableToSuspended(kSuspended); 4552 ThreadList* tl = Runtime::Current()->GetThreadList(); 4553 tl->SuspendAll(__FUNCTION__); 4554 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 4555 context.SetChunkOverhead(0); 4556 space->AsRegionSpace()->Walk(BumpPointerSpaceCallback, &context); 4557 HeapChunkContext::HeapChunkJavaCallback(nullptr, nullptr, 0, &context); 4558 tl->ResumeAll(); 4559 self->TransitionFromSuspendedToRunnable(); 4560 heap->DecrementDisableMovingGC(self); 4561 } else { 4562 UNIMPLEMENTED(WARNING) << "Not counting objects in space " << *space; 4563 } 4564 context.ResetStartOfNextChunk(); 4565 } 4566 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_); 4567 // Walk the large objects, these are not in the AllocSpace. 4568 context.SetChunkOverhead(0); 4569 heap->GetLargeObjectsSpace()->Walk(HeapChunkContext::HeapChunkJavaCallback, &context); 4570 } 4571 4572 // Finally, send a heap end chunk. 4573 Dbg::DdmSendChunk(native ? CHUNK_TYPE("NHEN") : CHUNK_TYPE("HPEN"), sizeof(heap_id), heap_id); 4574} 4575 4576static size_t GetAllocTrackerMax() { 4577#ifdef HAVE_ANDROID_OS 4578 // Check whether there's a system property overriding the number of records. 4579 const char* propertyName = "dalvik.vm.allocTrackerMax"; 4580 char allocRecordMaxString[PROPERTY_VALUE_MAX]; 4581 if (property_get(propertyName, allocRecordMaxString, "") > 0) { 4582 char* end; 4583 size_t value = strtoul(allocRecordMaxString, &end, 10); 4584 if (*end != '\0') { 4585 LOG(ERROR) << "Ignoring " << propertyName << " '" << allocRecordMaxString 4586 << "' --- invalid"; 4587 return kDefaultNumAllocRecords; 4588 } 4589 if (!IsPowerOfTwo(value)) { 4590 LOG(ERROR) << "Ignoring " << propertyName << " '" << allocRecordMaxString 4591 << "' --- not power of two"; 4592 return kDefaultNumAllocRecords; 4593 } 4594 return value; 4595 } 4596#endif 4597 return kDefaultNumAllocRecords; 4598} 4599 4600void Dbg::SetAllocTrackingEnabled(bool enable) { 4601 Thread* self = Thread::Current(); 4602 if (enable) { 4603 { 4604 MutexLock mu(self, *Locks::alloc_tracker_lock_); 4605 if (recent_allocation_records_ != nullptr) { 4606 return; // Already enabled, bail. 4607 } 4608 alloc_record_max_ = GetAllocTrackerMax(); 4609 LOG(INFO) << "Enabling alloc tracker (" << alloc_record_max_ << " entries of " 4610 << kMaxAllocRecordStackDepth << " frames, taking " 4611 << PrettySize(sizeof(AllocRecord) * alloc_record_max_) << ")"; 4612 DCHECK_EQ(alloc_record_head_, 0U); 4613 DCHECK_EQ(alloc_record_count_, 0U); 4614 recent_allocation_records_ = new AllocRecord[alloc_record_max_]; 4615 CHECK(recent_allocation_records_ != nullptr); 4616 } 4617 Runtime::Current()->GetInstrumentation()->InstrumentQuickAllocEntryPoints(); 4618 } else { 4619 { 4620 ScopedObjectAccess soa(self); // For type_cache_.Clear(); 4621 MutexLock mu(self, *Locks::alloc_tracker_lock_); 4622 if (recent_allocation_records_ == nullptr) { 4623 return; // Already disabled, bail. 4624 } 4625 LOG(INFO) << "Disabling alloc tracker"; 4626 delete[] recent_allocation_records_; 4627 recent_allocation_records_ = nullptr; 4628 alloc_record_head_ = 0; 4629 alloc_record_count_ = 0; 4630 type_cache_.Clear(); 4631 } 4632 // If an allocation comes in before we uninstrument, we will safely drop it on the floor. 4633 Runtime::Current()->GetInstrumentation()->UninstrumentQuickAllocEntryPoints(); 4634 } 4635} 4636 4637struct AllocRecordStackVisitor : public StackVisitor { 4638 AllocRecordStackVisitor(Thread* thread, AllocRecord* record_in) 4639 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 4640 : StackVisitor(thread, nullptr), record(record_in), depth(0) {} 4641 4642 // TODO: Enable annotalysis. We know lock is held in constructor, but abstraction confuses 4643 // annotalysis. 4644 bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS { 4645 if (depth >= kMaxAllocRecordStackDepth) { 4646 return false; 4647 } 4648 mirror::ArtMethod* m = GetMethod(); 4649 if (!m->IsRuntimeMethod()) { 4650 record->StackElement(depth)->SetMethod(m); 4651 record->StackElement(depth)->SetDexPc(GetDexPc()); 4652 ++depth; 4653 } 4654 return true; 4655 } 4656 4657 ~AllocRecordStackVisitor() { 4658 // Clear out any unused stack trace elements. 4659 for (; depth < kMaxAllocRecordStackDepth; ++depth) { 4660 record->StackElement(depth)->SetMethod(nullptr); 4661 record->StackElement(depth)->SetDexPc(0); 4662 } 4663 } 4664 4665 AllocRecord* record; 4666 size_t depth; 4667}; 4668 4669void Dbg::RecordAllocation(Thread* self, mirror::Class* type, size_t byte_count) { 4670 MutexLock mu(self, *Locks::alloc_tracker_lock_); 4671 if (recent_allocation_records_ == nullptr) { 4672 // In the process of shutting down recording, bail. 4673 return; 4674 } 4675 4676 // Advance and clip. 4677 if (++alloc_record_head_ == alloc_record_max_) { 4678 alloc_record_head_ = 0; 4679 } 4680 4681 // Fill in the basics. 4682 AllocRecord* record = &recent_allocation_records_[alloc_record_head_]; 4683 record->SetType(type); 4684 record->SetByteCount(byte_count); 4685 record->SetThinLockId(self->GetThreadId()); 4686 4687 // Fill in the stack trace. 4688 AllocRecordStackVisitor visitor(self, record); 4689 visitor.WalkStack(); 4690 4691 if (alloc_record_count_ < alloc_record_max_) { 4692 ++alloc_record_count_; 4693 } 4694} 4695 4696// Returns the index of the head element. 4697// 4698// We point at the most-recently-written record, so if alloc_record_count_ is 1 4699// we want to use the current element. Take "head+1" and subtract count 4700// from it. 4701// 4702// We need to handle underflow in our circular buffer, so we add 4703// alloc_record_max_ and then mask it back down. 4704size_t Dbg::HeadIndex() { 4705 return (Dbg::alloc_record_head_ + 1 + Dbg::alloc_record_max_ - Dbg::alloc_record_count_) & 4706 (Dbg::alloc_record_max_ - 1); 4707} 4708 4709void Dbg::DumpRecentAllocations() { 4710 ScopedObjectAccess soa(Thread::Current()); 4711 MutexLock mu(soa.Self(), *Locks::alloc_tracker_lock_); 4712 if (recent_allocation_records_ == nullptr) { 4713 LOG(INFO) << "Not recording tracked allocations"; 4714 return; 4715 } 4716 4717 // "i" is the head of the list. We want to start at the end of the 4718 // list and move forward to the tail. 4719 size_t i = HeadIndex(); 4720 const uint16_t capped_count = CappedAllocRecordCount(Dbg::alloc_record_count_); 4721 uint16_t count = capped_count; 4722 4723 LOG(INFO) << "Tracked allocations, (head=" << alloc_record_head_ << " count=" << count << ")"; 4724 while (count--) { 4725 AllocRecord* record = &recent_allocation_records_[i]; 4726 4727 LOG(INFO) << StringPrintf(" Thread %-2d %6zd bytes ", record->ThinLockId(), record->ByteCount()) 4728 << PrettyClass(record->Type()); 4729 4730 for (size_t stack_frame = 0; stack_frame < kMaxAllocRecordStackDepth; ++stack_frame) { 4731 AllocRecordStackTraceElement* stack_element = record->StackElement(stack_frame); 4732 mirror::ArtMethod* m = stack_element->Method(); 4733 if (m == nullptr) { 4734 break; 4735 } 4736 LOG(INFO) << " " << PrettyMethod(m) << " line " << stack_element->LineNumber(); 4737 } 4738 4739 // pause periodically to help logcat catch up 4740 if ((count % 5) == 0) { 4741 usleep(40000); 4742 } 4743 4744 i = (i + 1) & (alloc_record_max_ - 1); 4745 } 4746} 4747 4748class StringTable { 4749 public: 4750 StringTable() { 4751 } 4752 4753 void Add(const std::string& str) { 4754 table_.insert(str); 4755 } 4756 4757 void Add(const char* str) { 4758 table_.insert(str); 4759 } 4760 4761 size_t IndexOf(const char* s) const { 4762 auto it = table_.find(s); 4763 if (it == table_.end()) { 4764 LOG(FATAL) << "IndexOf(\"" << s << "\") failed"; 4765 } 4766 return std::distance(table_.begin(), it); 4767 } 4768 4769 size_t Size() const { 4770 return table_.size(); 4771 } 4772 4773 void WriteTo(std::vector<uint8_t>& bytes) const { 4774 for (const std::string& str : table_) { 4775 const char* s = str.c_str(); 4776 size_t s_len = CountModifiedUtf8Chars(s); 4777 std::unique_ptr<uint16_t> s_utf16(new uint16_t[s_len]); 4778 ConvertModifiedUtf8ToUtf16(s_utf16.get(), s); 4779 JDWP::AppendUtf16BE(bytes, s_utf16.get(), s_len); 4780 } 4781 } 4782 4783 private: 4784 std::set<std::string> table_; 4785 DISALLOW_COPY_AND_ASSIGN(StringTable); 4786}; 4787 4788static const char* GetMethodSourceFile(mirror::ArtMethod* method) 4789 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 4790 DCHECK(method != nullptr); 4791 const char* source_file = method->GetDeclaringClassSourceFile(); 4792 return (source_file != nullptr) ? source_file : ""; 4793} 4794 4795/* 4796 * The data we send to DDMS contains everything we have recorded. 4797 * 4798 * Message header (all values big-endian): 4799 * (1b) message header len (to allow future expansion); includes itself 4800 * (1b) entry header len 4801 * (1b) stack frame len 4802 * (2b) number of entries 4803 * (4b) offset to string table from start of message 4804 * (2b) number of class name strings 4805 * (2b) number of method name strings 4806 * (2b) number of source file name strings 4807 * For each entry: 4808 * (4b) total allocation size 4809 * (2b) thread id 4810 * (2b) allocated object's class name index 4811 * (1b) stack depth 4812 * For each stack frame: 4813 * (2b) method's class name 4814 * (2b) method name 4815 * (2b) method source file 4816 * (2b) line number, clipped to 32767; -2 if native; -1 if no source 4817 * (xb) class name strings 4818 * (xb) method name strings 4819 * (xb) source file strings 4820 * 4821 * As with other DDM traffic, strings are sent as a 4-byte length 4822 * followed by UTF-16 data. 4823 * 4824 * We send up 16-bit unsigned indexes into string tables. In theory there 4825 * can be (kMaxAllocRecordStackDepth * alloc_record_max_) unique strings in 4826 * each table, but in practice there should be far fewer. 4827 * 4828 * The chief reason for using a string table here is to keep the size of 4829 * the DDMS message to a minimum. This is partly to make the protocol 4830 * efficient, but also because we have to form the whole thing up all at 4831 * once in a memory buffer. 4832 * 4833 * We use separate string tables for class names, method names, and source 4834 * files to keep the indexes small. There will generally be no overlap 4835 * between the contents of these tables. 4836 */ 4837jbyteArray Dbg::GetRecentAllocations() { 4838 if ((false)) { 4839 DumpRecentAllocations(); 4840 } 4841 4842 Thread* self = Thread::Current(); 4843 std::vector<uint8_t> bytes; 4844 { 4845 MutexLock mu(self, *Locks::alloc_tracker_lock_); 4846 // 4847 // Part 1: generate string tables. 4848 // 4849 StringTable class_names; 4850 StringTable method_names; 4851 StringTable filenames; 4852 4853 const uint16_t capped_count = CappedAllocRecordCount(Dbg::alloc_record_count_); 4854 uint16_t count = capped_count; 4855 size_t idx = HeadIndex(); 4856 while (count--) { 4857 AllocRecord* record = &recent_allocation_records_[idx]; 4858 std::string temp; 4859 class_names.Add(record->Type()->GetDescriptor(&temp)); 4860 for (size_t i = 0; i < kMaxAllocRecordStackDepth; i++) { 4861 mirror::ArtMethod* m = record->StackElement(i)->Method(); 4862 if (m != nullptr) { 4863 class_names.Add(m->GetDeclaringClassDescriptor()); 4864 method_names.Add(m->GetName()); 4865 filenames.Add(GetMethodSourceFile(m)); 4866 } 4867 } 4868 4869 idx = (idx + 1) & (alloc_record_max_ - 1); 4870 } 4871 4872 LOG(INFO) << "allocation records: " << capped_count; 4873 4874 // 4875 // Part 2: Generate the output and store it in the buffer. 4876 // 4877 4878 // (1b) message header len (to allow future expansion); includes itself 4879 // (1b) entry header len 4880 // (1b) stack frame len 4881 const int kMessageHeaderLen = 15; 4882 const int kEntryHeaderLen = 9; 4883 const int kStackFrameLen = 8; 4884 JDWP::Append1BE(bytes, kMessageHeaderLen); 4885 JDWP::Append1BE(bytes, kEntryHeaderLen); 4886 JDWP::Append1BE(bytes, kStackFrameLen); 4887 4888 // (2b) number of entries 4889 // (4b) offset to string table from start of message 4890 // (2b) number of class name strings 4891 // (2b) number of method name strings 4892 // (2b) number of source file name strings 4893 JDWP::Append2BE(bytes, capped_count); 4894 size_t string_table_offset = bytes.size(); 4895 JDWP::Append4BE(bytes, 0); // We'll patch this later... 4896 JDWP::Append2BE(bytes, class_names.Size()); 4897 JDWP::Append2BE(bytes, method_names.Size()); 4898 JDWP::Append2BE(bytes, filenames.Size()); 4899 4900 idx = HeadIndex(); 4901 std::string temp; 4902 for (count = capped_count; count != 0; --count) { 4903 // For each entry: 4904 // (4b) total allocation size 4905 // (2b) thread id 4906 // (2b) allocated object's class name index 4907 // (1b) stack depth 4908 AllocRecord* record = &recent_allocation_records_[idx]; 4909 size_t stack_depth = record->GetDepth(); 4910 size_t allocated_object_class_name_index = 4911 class_names.IndexOf(record->Type()->GetDescriptor(&temp)); 4912 JDWP::Append4BE(bytes, record->ByteCount()); 4913 JDWP::Append2BE(bytes, record->ThinLockId()); 4914 JDWP::Append2BE(bytes, allocated_object_class_name_index); 4915 JDWP::Append1BE(bytes, stack_depth); 4916 4917 for (size_t stack_frame = 0; stack_frame < stack_depth; ++stack_frame) { 4918 // For each stack frame: 4919 // (2b) method's class name 4920 // (2b) method name 4921 // (2b) method source file 4922 // (2b) line number, clipped to 32767; -2 if native; -1 if no source 4923 mirror::ArtMethod* m = record->StackElement(stack_frame)->Method(); 4924 size_t class_name_index = class_names.IndexOf(m->GetDeclaringClassDescriptor()); 4925 size_t method_name_index = method_names.IndexOf(m->GetName()); 4926 size_t file_name_index = filenames.IndexOf(GetMethodSourceFile(m)); 4927 JDWP::Append2BE(bytes, class_name_index); 4928 JDWP::Append2BE(bytes, method_name_index); 4929 JDWP::Append2BE(bytes, file_name_index); 4930 JDWP::Append2BE(bytes, record->StackElement(stack_frame)->LineNumber()); 4931 } 4932 idx = (idx + 1) & (alloc_record_max_ - 1); 4933 } 4934 4935 // (xb) class name strings 4936 // (xb) method name strings 4937 // (xb) source file strings 4938 JDWP::Set4BE(&bytes[string_table_offset], bytes.size()); 4939 class_names.WriteTo(bytes); 4940 method_names.WriteTo(bytes); 4941 filenames.WriteTo(bytes); 4942 } 4943 JNIEnv* env = self->GetJniEnv(); 4944 jbyteArray result = env->NewByteArray(bytes.size()); 4945 if (result != nullptr) { 4946 env->SetByteArrayRegion(result, 0, bytes.size(), reinterpret_cast<const jbyte*>(&bytes[0])); 4947 } 4948 return result; 4949} 4950 4951mirror::ArtMethod* DeoptimizationRequest::Method() const { 4952 ScopedObjectAccessUnchecked soa(Thread::Current()); 4953 return soa.DecodeMethod(method_); 4954} 4955 4956void DeoptimizationRequest::SetMethod(mirror::ArtMethod* m) { 4957 ScopedObjectAccessUnchecked soa(Thread::Current()); 4958 method_ = soa.EncodeMethod(m); 4959} 4960 4961} // namespace art 4962