class.cc revision cb086955c2a21270cd2f53a8bce71e577d776506
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "class.h" 18 19#include "art_field-inl.h" 20#include "art_method-inl.h" 21#include "class_linker-inl.h" 22#include "class_loader.h" 23#include "class-inl.h" 24#include "dex_cache.h" 25#include "dex_file-inl.h" 26#include "gc/accounting/card_table-inl.h" 27#include "handle_scope-inl.h" 28#include "method.h" 29#include "object_array-inl.h" 30#include "object-inl.h" 31#include "runtime.h" 32#include "thread.h" 33#include "throwable.h" 34#include "utils.h" 35#include "well_known_classes.h" 36 37namespace art { 38namespace mirror { 39 40GcRoot<Class> Class::java_lang_Class_; 41 42void Class::SetClassClass(Class* java_lang_Class) { 43 CHECK(java_lang_Class_.IsNull()) 44 << java_lang_Class_.Read() 45 << " " << java_lang_Class; 46 CHECK(java_lang_Class != nullptr); 47 java_lang_Class->SetClassFlags(mirror::kClassFlagClass); 48 java_lang_Class_ = GcRoot<Class>(java_lang_Class); 49} 50 51void Class::ResetClass() { 52 CHECK(!java_lang_Class_.IsNull()); 53 java_lang_Class_ = GcRoot<Class>(nullptr); 54} 55 56void Class::VisitRoots(RootVisitor* visitor) { 57 java_lang_Class_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass)); 58} 59 60inline void Class::SetVerifyError(mirror::Object* error) { 61 CHECK(error != nullptr) << PrettyClass(this); 62 if (Runtime::Current()->IsActiveTransaction()) { 63 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, verify_error_), error); 64 } else { 65 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, verify_error_), error); 66 } 67} 68 69void Class::SetStatus(Handle<Class> h_this, Status new_status, Thread* self) { 70 Status old_status = h_this->GetStatus(); 71 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 72 bool class_linker_initialized = class_linker != nullptr && class_linker->IsInitialized(); 73 if (LIKELY(class_linker_initialized)) { 74 if (UNLIKELY(new_status <= old_status && new_status != kStatusError && 75 new_status != kStatusRetired)) { 76 LOG(FATAL) << "Unexpected change back of class status for " << PrettyClass(h_this.Get()) 77 << " " << old_status << " -> " << new_status; 78 } 79 if (new_status >= kStatusResolved || old_status >= kStatusResolved) { 80 // When classes are being resolved the resolution code should hold the lock. 81 CHECK_EQ(h_this->GetLockOwnerThreadId(), self->GetThreadId()) 82 << "Attempt to change status of class while not holding its lock: " 83 << PrettyClass(h_this.Get()) << " " << old_status << " -> " << new_status; 84 } 85 } 86 if (UNLIKELY(new_status == kStatusError)) { 87 CHECK_NE(h_this->GetStatus(), kStatusError) 88 << "Attempt to set as erroneous an already erroneous class " 89 << PrettyClass(h_this.Get()); 90 if (VLOG_IS_ON(class_linker)) { 91 LOG(ERROR) << "Setting " << PrettyDescriptor(h_this.Get()) << " to erroneous."; 92 if (self->IsExceptionPending()) { 93 LOG(ERROR) << "Exception: " << self->GetException()->Dump(); 94 } 95 } 96 97 // Remember the current exception. 98 CHECK(self->GetException() != nullptr); 99 h_this->SetVerifyError(self->GetException()); 100 } 101 static_assert(sizeof(Status) == sizeof(uint32_t), "Size of status not equal to uint32"); 102 if (Runtime::Current()->IsActiveTransaction()) { 103 h_this->SetField32Volatile<true>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 104 } else { 105 h_this->SetField32Volatile<false>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 106 } 107 108 if (!class_linker_initialized) { 109 // When the class linker is being initialized its single threaded and by definition there can be 110 // no waiters. During initialization classes may appear temporary but won't be retired as their 111 // size was statically computed. 112 } else { 113 // Classes that are being resolved or initialized need to notify waiters that the class status 114 // changed. See ClassLinker::EnsureResolved and ClassLinker::WaitForInitializeClass. 115 if (h_this->IsTemp()) { 116 // Class is a temporary one, ensure that waiters for resolution get notified of retirement 117 // so that they can grab the new version of the class from the class linker's table. 118 CHECK_LT(new_status, kStatusResolved) << PrettyDescriptor(h_this.Get()); 119 if (new_status == kStatusRetired || new_status == kStatusError) { 120 h_this->NotifyAll(self); 121 } 122 } else { 123 CHECK_NE(new_status, kStatusRetired); 124 if (old_status >= kStatusResolved || new_status >= kStatusResolved) { 125 h_this->NotifyAll(self); 126 } 127 } 128 } 129} 130 131void Class::SetDexCache(DexCache* new_dex_cache) { 132 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache); 133 SetDexCacheStrings(new_dex_cache != nullptr ? new_dex_cache->GetStrings() : nullptr); 134} 135 136void Class::SetClassSize(uint32_t new_class_size) { 137 if (kIsDebugBuild && new_class_size < GetClassSize()) { 138 DumpClass(LOG(INTERNAL_FATAL), kDumpClassFullDetail); 139 LOG(INTERNAL_FATAL) << new_class_size << " vs " << GetClassSize(); 140 LOG(FATAL) << " class=" << PrettyTypeOf(this); 141 } 142 // Not called within a transaction. 143 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size); 144} 145 146// Return the class' name. The exact format is bizarre, but it's the specified behavior for 147// Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int" 148// but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than 149// slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness. 150String* Class::ComputeName(Handle<Class> h_this) { 151 String* name = h_this->GetName(); 152 if (name != nullptr) { 153 return name; 154 } 155 std::string temp; 156 const char* descriptor = h_this->GetDescriptor(&temp); 157 Thread* self = Thread::Current(); 158 if ((descriptor[0] != 'L') && (descriptor[0] != '[')) { 159 // The descriptor indicates that this is the class for 160 // a primitive type; special-case the return value. 161 const char* c_name = nullptr; 162 switch (descriptor[0]) { 163 case 'Z': c_name = "boolean"; break; 164 case 'B': c_name = "byte"; break; 165 case 'C': c_name = "char"; break; 166 case 'S': c_name = "short"; break; 167 case 'I': c_name = "int"; break; 168 case 'J': c_name = "long"; break; 169 case 'F': c_name = "float"; break; 170 case 'D': c_name = "double"; break; 171 case 'V': c_name = "void"; break; 172 default: 173 LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]); 174 } 175 name = String::AllocFromModifiedUtf8(self, c_name); 176 } else { 177 // Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package 178 // components. 179 name = String::AllocFromModifiedUtf8(self, DescriptorToDot(descriptor).c_str()); 180 } 181 h_this->SetName(name); 182 return name; 183} 184 185void Class::DumpClass(std::ostream& os, int flags) { 186 if ((flags & kDumpClassFullDetail) == 0) { 187 os << PrettyClass(this); 188 if ((flags & kDumpClassClassLoader) != 0) { 189 os << ' ' << GetClassLoader(); 190 } 191 if ((flags & kDumpClassInitialized) != 0) { 192 os << ' ' << GetStatus(); 193 } 194 os << "\n"; 195 return; 196 } 197 198 Thread* const self = Thread::Current(); 199 StackHandleScope<2> hs(self); 200 Handle<mirror::Class> h_this(hs.NewHandle(this)); 201 Handle<mirror::Class> h_super(hs.NewHandle(GetSuperClass())); 202 auto image_pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize(); 203 204 std::string temp; 205 os << "----- " << (IsInterface() ? "interface" : "class") << " " 206 << "'" << GetDescriptor(&temp) << "' cl=" << GetClassLoader() << " -----\n", 207 os << " objectSize=" << SizeOf() << " " 208 << "(" << (h_super.Get() != nullptr ? h_super->SizeOf() : -1) << " from super)\n", 209 os << StringPrintf(" access=0x%04x.%04x\n", 210 GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask); 211 if (h_super.Get() != nullptr) { 212 os << " super='" << PrettyClass(h_super.Get()) << "' (cl=" << h_super->GetClassLoader() 213 << ")\n"; 214 } 215 if (IsArrayClass()) { 216 os << " componentType=" << PrettyClass(GetComponentType()) << "\n"; 217 } 218 const size_t num_direct_interfaces = NumDirectInterfaces(); 219 if (num_direct_interfaces > 0) { 220 os << " interfaces (" << num_direct_interfaces << "):\n"; 221 for (size_t i = 0; i < num_direct_interfaces; ++i) { 222 Class* interface = GetDirectInterface(self, h_this, i); 223 if (interface == nullptr) { 224 os << StringPrintf(" %2zd: nullptr!\n", i); 225 } else { 226 const ClassLoader* cl = interface->GetClassLoader(); 227 os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl); 228 } 229 } 230 } 231 if (!IsLoaded()) { 232 os << " class not yet loaded"; 233 } else { 234 // After this point, this may have moved due to GetDirectInterface. 235 os << " vtable (" << h_this->NumVirtualMethods() << " entries, " 236 << (h_super.Get() != nullptr ? h_super->NumVirtualMethods() : 0) << " in super):\n"; 237 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 238 os << StringPrintf(" %2zd: %s\n", i, PrettyMethod( 239 h_this->GetVirtualMethodDuringLinking(i, image_pointer_size)).c_str()); 240 } 241 os << " direct methods (" << h_this->NumDirectMethods() << " entries):\n"; 242 for (size_t i = 0; i < h_this->NumDirectMethods(); ++i) { 243 os << StringPrintf(" %2zd: %s\n", i, PrettyMethod( 244 h_this->GetDirectMethod(i, image_pointer_size)).c_str()); 245 } 246 if (h_this->NumStaticFields() > 0) { 247 os << " static fields (" << h_this->NumStaticFields() << " entries):\n"; 248 if (h_this->IsResolved() || h_this->IsErroneous()) { 249 for (size_t i = 0; i < h_this->NumStaticFields(); ++i) { 250 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetStaticField(i)).c_str()); 251 } 252 } else { 253 os << " <not yet available>"; 254 } 255 } 256 if (h_this->NumInstanceFields() > 0) { 257 os << " instance fields (" << h_this->NumInstanceFields() << " entries):\n"; 258 if (h_this->IsResolved() || h_this->IsErroneous()) { 259 for (size_t i = 0; i < h_this->NumInstanceFields(); ++i) { 260 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetInstanceField(i)).c_str()); 261 } 262 } else { 263 os << " <not yet available>"; 264 } 265 } 266 } 267} 268 269void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) { 270 if (kIsDebugBuild && new_reference_offsets != kClassWalkSuper) { 271 // Sanity check that the number of bits set in the reference offset bitmap 272 // agrees with the number of references 273 uint32_t count = 0; 274 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 275 count += c->NumReferenceInstanceFieldsDuringLinking(); 276 } 277 // +1 for the Class in Object. 278 CHECK_EQ(static_cast<uint32_t>(POPCOUNT(new_reference_offsets)) + 1, count); 279 } 280 // Not called within a transaction. 281 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_), 282 new_reference_offsets); 283} 284 285bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) { 286 size_t i = 0; 287 size_t min_length = std::min(descriptor1.size(), descriptor2.size()); 288 while (i < min_length && descriptor1[i] == descriptor2[i]) { 289 ++i; 290 } 291 if (descriptor1.find('/', i) != StringPiece::npos || 292 descriptor2.find('/', i) != StringPiece::npos) { 293 return false; 294 } else { 295 return true; 296 } 297} 298 299bool Class::IsInSamePackage(Class* that) { 300 Class* klass1 = this; 301 Class* klass2 = that; 302 if (klass1 == klass2) { 303 return true; 304 } 305 // Class loaders must match. 306 if (klass1->GetClassLoader() != klass2->GetClassLoader()) { 307 return false; 308 } 309 // Arrays are in the same package when their element classes are. 310 while (klass1->IsArrayClass()) { 311 klass1 = klass1->GetComponentType(); 312 } 313 while (klass2->IsArrayClass()) { 314 klass2 = klass2->GetComponentType(); 315 } 316 // trivial check again for array types 317 if (klass1 == klass2) { 318 return true; 319 } 320 // Compare the package part of the descriptor string. 321 std::string temp1, temp2; 322 return IsInSamePackage(klass1->GetDescriptor(&temp1), klass2->GetDescriptor(&temp2)); 323} 324 325bool Class::IsThrowableClass() { 326 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this); 327} 328 329void Class::SetClassLoader(ClassLoader* new_class_loader) { 330 if (Runtime::Current()->IsActiveTransaction()) { 331 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 332 } else { 333 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 334 } 335} 336 337ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature, 338 size_t pointer_size) { 339 // Check the current class before checking the interfaces. 340 ArtMethod* method = FindDeclaredVirtualMethod(name, signature, pointer_size); 341 if (method != nullptr) { 342 return method; 343 } 344 345 int32_t iftable_count = GetIfTableCount(); 346 IfTable* iftable = GetIfTable(); 347 for (int32_t i = 0; i < iftable_count; ++i) { 348 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature, pointer_size); 349 if (method != nullptr) { 350 return method; 351 } 352 } 353 return nullptr; 354} 355 356ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature, 357 size_t pointer_size) { 358 // Check the current class before checking the interfaces. 359 ArtMethod* method = FindDeclaredVirtualMethod(name, signature, pointer_size); 360 if (method != nullptr) { 361 return method; 362 } 363 364 int32_t iftable_count = GetIfTableCount(); 365 IfTable* iftable = GetIfTable(); 366 for (int32_t i = 0; i < iftable_count; ++i) { 367 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature, pointer_size); 368 if (method != nullptr) { 369 return method; 370 } 371 } 372 return nullptr; 373} 374 375ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx, 376 size_t pointer_size) { 377 // Check the current class before checking the interfaces. 378 ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx, pointer_size); 379 if (method != nullptr) { 380 return method; 381 } 382 383 int32_t iftable_count = GetIfTableCount(); 384 IfTable* iftable = GetIfTable(); 385 for (int32_t i = 0; i < iftable_count; ++i) { 386 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod( 387 dex_cache, dex_method_idx, pointer_size); 388 if (method != nullptr) { 389 return method; 390 } 391 } 392 return nullptr; 393} 394 395ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature, 396 size_t pointer_size) { 397 for (auto& method : GetDirectMethods(pointer_size)) { 398 if (name == method.GetName() && method.GetSignature() == signature) { 399 return &method; 400 } 401 } 402 return nullptr; 403} 404 405ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature, 406 size_t pointer_size) { 407 for (auto& method : GetDirectMethods(pointer_size)) { 408 if (name == method.GetName() && signature == method.GetSignature()) { 409 return &method; 410 } 411 } 412 return nullptr; 413} 414 415ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx, 416 size_t pointer_size) { 417 if (GetDexCache() == dex_cache) { 418 for (auto& method : GetDirectMethods(pointer_size)) { 419 if (method.GetDexMethodIndex() == dex_method_idx) { 420 return &method; 421 } 422 } 423 } 424 return nullptr; 425} 426 427ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature, 428 size_t pointer_size) { 429 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 430 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature, pointer_size); 431 if (method != nullptr) { 432 return method; 433 } 434 } 435 return nullptr; 436} 437 438ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature, 439 size_t pointer_size) { 440 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 441 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature, pointer_size); 442 if (method != nullptr) { 443 return method; 444 } 445 } 446 return nullptr; 447} 448 449ArtMethod* Class::FindDirectMethod( 450 const DexCache* dex_cache, uint32_t dex_method_idx, size_t pointer_size) { 451 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 452 ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx, pointer_size); 453 if (method != nullptr) { 454 return method; 455 } 456 } 457 return nullptr; 458} 459 460ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature, 461 size_t pointer_size) { 462 for (auto& method : GetVirtualMethods(pointer_size)) { 463 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size); 464 if (name == np_method->GetName() && np_method->GetSignature() == signature) { 465 return &method; 466 } 467 } 468 return nullptr; 469} 470 471ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature, 472 size_t pointer_size) { 473 for (auto& method : GetVirtualMethods(pointer_size)) { 474 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size); 475 if (name == np_method->GetName() && signature == np_method->GetSignature()) { 476 return &method; 477 } 478 } 479 return nullptr; 480} 481 482ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx, 483 size_t pointer_size) { 484 if (GetDexCache() == dex_cache) { 485 for (auto& method : GetVirtualMethods(pointer_size)) { 486 // A miranda method may have a different DexCache and is always created by linking, 487 // never *declared* in the class. 488 if (method.GetDexMethodIndex() == dex_method_idx && !method.IsMiranda()) { 489 return &method; 490 } 491 } 492 } 493 return nullptr; 494} 495 496ArtMethod* Class::FindDeclaredVirtualMethodByName(const StringPiece& name, size_t pointer_size) { 497 for (auto& method : GetVirtualMethods(pointer_size)) { 498 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size); 499 if (name == np_method->GetName()) { 500 return &method; 501 } 502 } 503 return nullptr; 504} 505 506ArtMethod* Class::FindVirtualMethod( 507 const StringPiece& name, const StringPiece& signature, size_t pointer_size) { 508 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 509 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature, pointer_size); 510 if (method != nullptr) { 511 return method; 512 } 513 } 514 return nullptr; 515} 516 517ArtMethod* Class::FindVirtualMethod( 518 const StringPiece& name, const Signature& signature, size_t pointer_size) { 519 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 520 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature, pointer_size); 521 if (method != nullptr) { 522 return method; 523 } 524 } 525 return nullptr; 526} 527 528ArtMethod* Class::FindVirtualMethod( 529 const DexCache* dex_cache, uint32_t dex_method_idx, size_t pointer_size) { 530 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 531 ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx, pointer_size); 532 if (method != nullptr) { 533 return method; 534 } 535 } 536 return nullptr; 537} 538 539ArtMethod* Class::FindClassInitializer(size_t pointer_size) { 540 for (ArtMethod& method : GetDirectMethods(pointer_size)) { 541 if (method.IsClassInitializer()) { 542 DCHECK_STREQ(method.GetName(), "<clinit>"); 543 DCHECK_STREQ(method.GetSignature().ToString().c_str(), "()V"); 544 return &method; 545 } 546 } 547 return nullptr; 548} 549 550// Custom binary search to avoid double comparisons from std::binary_search. 551static ArtField* FindFieldByNameAndType(LengthPrefixedArray<ArtField>* fields, 552 const StringPiece& name, 553 const StringPiece& type) 554 SHARED_REQUIRES(Locks::mutator_lock_) { 555 if (fields == nullptr) { 556 return nullptr; 557 } 558 size_t low = 0; 559 size_t high = fields->size(); 560 ArtField* ret = nullptr; 561 while (low < high) { 562 size_t mid = (low + high) / 2; 563 ArtField& field = fields->At(mid); 564 // Fields are sorted by class, then name, then type descriptor. This is verified in dex file 565 // verifier. There can be multiple fields with the same in the same class name due to proguard. 566 int result = StringPiece(field.GetName()).Compare(name); 567 if (result == 0) { 568 result = StringPiece(field.GetTypeDescriptor()).Compare(type); 569 } 570 if (result < 0) { 571 low = mid + 1; 572 } else if (result > 0) { 573 high = mid; 574 } else { 575 ret = &field; 576 break; 577 } 578 } 579 if (kIsDebugBuild) { 580 ArtField* found = nullptr; 581 for (ArtField& field : MakeIterationRangeFromLengthPrefixedArray(fields)) { 582 if (name == field.GetName() && type == field.GetTypeDescriptor()) { 583 found = &field; 584 break; 585 } 586 } 587 CHECK_EQ(found, ret) << "Found " << PrettyField(found) << " vs " << PrettyField(ret); 588 } 589 return ret; 590} 591 592ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) { 593 // Binary search by name. Interfaces are not relevant because they can't contain instance fields. 594 return FindFieldByNameAndType(GetIFieldsPtr(), name, type); 595} 596 597ArtField* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 598 if (GetDexCache() == dex_cache) { 599 for (ArtField& field : GetIFields()) { 600 if (field.GetDexFieldIndex() == dex_field_idx) { 601 return &field; 602 } 603 } 604 } 605 return nullptr; 606} 607 608ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) { 609 // Is the field in this class, or any of its superclasses? 610 // Interfaces are not relevant because they can't contain instance fields. 611 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 612 ArtField* f = c->FindDeclaredInstanceField(name, type); 613 if (f != nullptr) { 614 return f; 615 } 616 } 617 return nullptr; 618} 619 620ArtField* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 621 // Is the field in this class, or any of its superclasses? 622 // Interfaces are not relevant because they can't contain instance fields. 623 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 624 ArtField* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx); 625 if (f != nullptr) { 626 return f; 627 } 628 } 629 return nullptr; 630} 631 632ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) { 633 DCHECK(type != nullptr); 634 return FindFieldByNameAndType(GetSFieldsPtr(), name, type); 635} 636 637ArtField* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) { 638 if (dex_cache == GetDexCache()) { 639 for (ArtField& field : GetSFields()) { 640 if (field.GetDexFieldIndex() == dex_field_idx) { 641 return &field; 642 } 643 } 644 } 645 return nullptr; 646} 647 648ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const StringPiece& name, 649 const StringPiece& type) { 650 // Is the field in this class (or its interfaces), or any of its 651 // superclasses (or their interfaces)? 652 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 653 // Is the field in this class? 654 ArtField* f = k->FindDeclaredStaticField(name, type); 655 if (f != nullptr) { 656 return f; 657 } 658 // Wrap k incase it moves during GetDirectInterface. 659 StackHandleScope<1> hs(self); 660 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 661 // Is this field in any of this class' interfaces? 662 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 663 StackHandleScope<1> hs2(self); 664 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 665 f = FindStaticField(self, interface, name, type); 666 if (f != nullptr) { 667 return f; 668 } 669 } 670 } 671 return nullptr; 672} 673 674ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const DexCache* dex_cache, 675 uint32_t dex_field_idx) { 676 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 677 // Is the field in this class? 678 ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx); 679 if (f != nullptr) { 680 return f; 681 } 682 // Wrap k incase it moves during GetDirectInterface. 683 StackHandleScope<1> hs(self); 684 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 685 // Is this field in any of this class' interfaces? 686 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 687 StackHandleScope<1> hs2(self); 688 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 689 f = FindStaticField(self, interface, dex_cache, dex_field_idx); 690 if (f != nullptr) { 691 return f; 692 } 693 } 694 } 695 return nullptr; 696} 697 698ArtField* Class::FindField(Thread* self, Handle<Class> klass, const StringPiece& name, 699 const StringPiece& type) { 700 // Find a field using the JLS field resolution order 701 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 702 // Is the field in this class? 703 ArtField* f = k->FindDeclaredInstanceField(name, type); 704 if (f != nullptr) { 705 return f; 706 } 707 f = k->FindDeclaredStaticField(name, type); 708 if (f != nullptr) { 709 return f; 710 } 711 // Is this field in any of this class' interfaces? 712 StackHandleScope<1> hs(self); 713 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 714 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 715 StackHandleScope<1> hs2(self); 716 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 717 f = interface->FindStaticField(self, interface, name, type); 718 if (f != nullptr) { 719 return f; 720 } 721 } 722 } 723 return nullptr; 724} 725 726void Class::SetPreverifiedFlagOnAllMethods(size_t pointer_size) { 727 DCHECK(IsVerified()); 728 for (auto& m : GetDirectMethods(pointer_size)) { 729 if (!m.IsNative() && !m.IsAbstract()) { 730 m.SetPreverified(); 731 } 732 } 733 for (auto& m : GetVirtualMethods(pointer_size)) { 734 if (!m.IsNative() && !m.IsAbstract()) { 735 m.SetPreverified(); 736 } 737 } 738} 739 740const char* Class::GetDescriptor(std::string* storage) { 741 if (IsPrimitive()) { 742 return Primitive::Descriptor(GetPrimitiveType()); 743 } else if (IsArrayClass()) { 744 return GetArrayDescriptor(storage); 745 } else if (IsProxyClass()) { 746 *storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this); 747 return storage->c_str(); 748 } else { 749 const DexFile& dex_file = GetDexFile(); 750 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_); 751 return dex_file.GetTypeDescriptor(type_id); 752 } 753} 754 755const char* Class::GetArrayDescriptor(std::string* storage) { 756 std::string temp; 757 const char* elem_desc = GetComponentType()->GetDescriptor(&temp); 758 *storage = "["; 759 *storage += elem_desc; 760 return storage->c_str(); 761} 762 763const DexFile::ClassDef* Class::GetClassDef() { 764 uint16_t class_def_idx = GetDexClassDefIndex(); 765 if (class_def_idx == DexFile::kDexNoIndex16) { 766 return nullptr; 767 } 768 return &GetDexFile().GetClassDef(class_def_idx); 769} 770 771uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) { 772 DCHECK(!IsPrimitive()); 773 DCHECK(!IsArrayClass()); 774 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_; 775} 776 777mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass, 778 uint32_t idx) { 779 DCHECK(klass.Get() != nullptr); 780 DCHECK(!klass->IsPrimitive()); 781 if (klass->IsArrayClass()) { 782 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 783 if (idx == 0) { 784 return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;"); 785 } else { 786 DCHECK_EQ(1U, idx); 787 return class_linker->FindSystemClass(self, "Ljava/io/Serializable;"); 788 } 789 } else if (klass->IsProxyClass()) { 790 mirror::ObjectArray<mirror::Class>* interfaces = klass.Get()->GetInterfaces(); 791 DCHECK(interfaces != nullptr); 792 return interfaces->Get(idx); 793 } else { 794 uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx); 795 mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx); 796 if (interface == nullptr) { 797 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx, 798 klass.Get()); 799 CHECK(interface != nullptr || self->IsExceptionPending()); 800 } 801 return interface; 802 } 803} 804 805const char* Class::GetSourceFile() { 806 const DexFile& dex_file = GetDexFile(); 807 const DexFile::ClassDef* dex_class_def = GetClassDef(); 808 if (dex_class_def == nullptr) { 809 // Generated classes have no class def. 810 return nullptr; 811 } 812 return dex_file.GetSourceFile(*dex_class_def); 813} 814 815std::string Class::GetLocation() { 816 mirror::DexCache* dex_cache = GetDexCache(); 817 if (dex_cache != nullptr && !IsProxyClass()) { 818 return dex_cache->GetLocation()->ToModifiedUtf8(); 819 } 820 // Arrays and proxies are generated and have no corresponding dex file location. 821 return "generated class"; 822} 823 824const DexFile::TypeList* Class::GetInterfaceTypeList() { 825 const DexFile::ClassDef* class_def = GetClassDef(); 826 if (class_def == nullptr) { 827 return nullptr; 828 } 829 return GetDexFile().GetInterfacesList(*class_def); 830} 831 832void Class::PopulateEmbeddedImtAndVTable(ArtMethod* const (&methods)[kImtSize], 833 size_t pointer_size) { 834 for (size_t i = 0; i < kImtSize; i++) { 835 auto method = methods[i]; 836 DCHECK(method != nullptr); 837 SetEmbeddedImTableEntry(i, method, pointer_size); 838 } 839 PointerArray* table = GetVTableDuringLinking(); 840 CHECK(table != nullptr) << PrettyClass(this); 841 const size_t table_length = table->GetLength(); 842 SetEmbeddedVTableLength(table_length); 843 for (size_t i = 0; i < table_length; i++) { 844 SetEmbeddedVTableEntry(i, table->GetElementPtrSize<ArtMethod*>(i, pointer_size), pointer_size); 845 } 846 // Keep java.lang.Object class's vtable around for since it's easier 847 // to be reused by array classes during their linking. 848 if (!IsObjectClass()) { 849 SetVTable(nullptr); 850 } 851} 852 853class ReadBarrierOnNativeRootsVisitor { 854 public: 855 void operator()(mirror::Object* obj ATTRIBUTE_UNUSED, 856 MemberOffset offset ATTRIBUTE_UNUSED, 857 bool is_static ATTRIBUTE_UNUSED) const {} 858 859 void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const 860 SHARED_REQUIRES(Locks::mutator_lock_) { 861 if (!root->IsNull()) { 862 VisitRoot(root); 863 } 864 } 865 866 void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const 867 SHARED_REQUIRES(Locks::mutator_lock_) { 868 mirror::Object* old_ref = root->AsMirrorPtr(); 869 mirror::Object* new_ref = ReadBarrier::BarrierForRoot(root); 870 if (old_ref != new_ref) { 871 // Update the field atomically. This may fail if mutator updates before us, but it's ok. 872 auto* atomic_root = 873 reinterpret_cast<Atomic<mirror::CompressedReference<mirror::Object>>*>(root); 874 atomic_root->CompareExchangeStrongSequentiallyConsistent( 875 mirror::CompressedReference<mirror::Object>::FromMirrorPtr(old_ref), 876 mirror::CompressedReference<mirror::Object>::FromMirrorPtr(new_ref)); 877 } 878 } 879}; 880 881// The pre-fence visitor for Class::CopyOf(). 882class CopyClassVisitor { 883 public: 884 CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig, size_t new_length, 885 size_t copy_bytes, ArtMethod* const (&imt)[mirror::Class::kImtSize], 886 size_t pointer_size) 887 : self_(self), orig_(orig), new_length_(new_length), 888 copy_bytes_(copy_bytes), imt_(imt), pointer_size_(pointer_size) { 889 } 890 891 void operator()(mirror::Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const 892 SHARED_REQUIRES(Locks::mutator_lock_) { 893 StackHandleScope<1> hs(self_); 894 Handle<mirror::Class> h_new_class_obj(hs.NewHandle(obj->AsClass())); 895 mirror::Object::CopyObject(self_, h_new_class_obj.Get(), orig_->Get(), copy_bytes_); 896 mirror::Class::SetStatus(h_new_class_obj, Class::kStatusResolving, self_); 897 h_new_class_obj->PopulateEmbeddedImtAndVTable(imt_, pointer_size_); 898 h_new_class_obj->SetClassSize(new_length_); 899 // Visit all of the references to make sure there is no from space references in the native 900 // roots. 901 static_cast<mirror::Object*>(h_new_class_obj.Get())->VisitReferences( 902 ReadBarrierOnNativeRootsVisitor(), VoidFunctor()); 903 } 904 905 private: 906 Thread* const self_; 907 Handle<mirror::Class>* const orig_; 908 const size_t new_length_; 909 const size_t copy_bytes_; 910 ArtMethod* const (&imt_)[mirror::Class::kImtSize]; 911 const size_t pointer_size_; 912 DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor); 913}; 914 915Class* Class::CopyOf(Thread* self, int32_t new_length, 916 ArtMethod* const (&imt)[mirror::Class::kImtSize], size_t pointer_size) { 917 DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class))); 918 // We may get copied by a compacting GC. 919 StackHandleScope<1> hs(self); 920 Handle<mirror::Class> h_this(hs.NewHandle(this)); 921 gc::Heap* heap = Runtime::Current()->GetHeap(); 922 // The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf() 923 // to skip copying the tail part that we will overwrite here. 924 CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class), imt, pointer_size); 925 mirror::Object* new_class = kMovingClasses ? 926 heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor) : 927 heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor); 928 if (UNLIKELY(new_class == nullptr)) { 929 self->AssertPendingOOMException(); 930 return nullptr; 931 } 932 return new_class->AsClass(); 933} 934 935bool Class::ProxyDescriptorEquals(const char* match) { 936 DCHECK(IsProxyClass()); 937 return Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this) == match; 938} 939 940// TODO: Move this to java_lang_Class.cc? 941ArtMethod* Class::GetDeclaredConstructor( 942 Thread* self, Handle<mirror::ObjectArray<mirror::Class>> args) { 943 for (auto& m : GetDirectMethods(sizeof(void*))) { 944 // Skip <clinit> which is a static constructor, as well as non constructors. 945 if (m.IsStatic() || !m.IsConstructor()) { 946 continue; 947 } 948 // May cause thread suspension and exceptions. 949 if (m.GetInterfaceMethodIfProxy(sizeof(void*))->EqualParameters(args)) { 950 return &m; 951 } 952 if (UNLIKELY(self->IsExceptionPending())) { 953 return nullptr; 954 } 955 } 956 return nullptr; 957} 958 959uint32_t Class::Depth() { 960 uint32_t depth = 0; 961 for (Class* klass = this; klass->GetSuperClass() != nullptr; klass = klass->GetSuperClass()) { 962 depth++; 963 } 964 return depth; 965} 966 967} // namespace mirror 968} // namespace art 969