class.cc revision 7db6dd79a24570448ae737ee1946b00396696cac
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(java_lang_Class->GetClassFlags() | 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 60void Class::SetStatus(Handle<Class> h_this, Status new_status, Thread* self) { 61 Status old_status = h_this->GetStatus(); 62 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 63 bool class_linker_initialized = class_linker != nullptr && class_linker->IsInitialized(); 64 if (LIKELY(class_linker_initialized)) { 65 if (UNLIKELY(new_status <= old_status && new_status != kStatusError && 66 new_status != kStatusRetired)) { 67 LOG(FATAL) << "Unexpected change back of class status for " << PrettyClass(h_this.Get()) 68 << " " << old_status << " -> " << new_status; 69 } 70 if (new_status >= kStatusResolved || old_status >= kStatusResolved) { 71 // When classes are being resolved the resolution code should hold the lock. 72 CHECK_EQ(h_this->GetLockOwnerThreadId(), self->GetThreadId()) 73 << "Attempt to change status of class while not holding its lock: " 74 << PrettyClass(h_this.Get()) << " " << old_status << " -> " << new_status; 75 } 76 } 77 if (UNLIKELY(new_status == kStatusError)) { 78 CHECK_NE(h_this->GetStatus(), kStatusError) 79 << "Attempt to set as erroneous an already erroneous class " 80 << PrettyClass(h_this.Get()); 81 82 // Stash current exception. 83 StackHandleScope<1> hs(self); 84 Handle<mirror::Throwable> old_exception(hs.NewHandle(self->GetException())); 85 CHECK(old_exception.Get() != nullptr); 86 Class* eiie_class; 87 // Do't attempt to use FindClass if we have an OOM error since this can try to do more 88 // allocations and may cause infinite loops. 89 bool throw_eiie = (old_exception.Get() == nullptr); 90 if (!throw_eiie) { 91 std::string temp; 92 const char* old_exception_descriptor = old_exception->GetClass()->GetDescriptor(&temp); 93 throw_eiie = (strcmp(old_exception_descriptor, "Ljava/lang/OutOfMemoryError;") != 0); 94 } 95 if (throw_eiie) { 96 // Clear exception to call FindSystemClass. 97 self->ClearException(); 98 eiie_class = Runtime::Current()->GetClassLinker()->FindSystemClass( 99 self, "Ljava/lang/ExceptionInInitializerError;"); 100 CHECK(!self->IsExceptionPending()); 101 // Only verification errors, not initialization problems, should set a verify error. 102 // This is to ensure that ThrowEarlierClassFailure will throw NoClassDefFoundError in that 103 // case. 104 Class* exception_class = old_exception->GetClass(); 105 if (!eiie_class->IsAssignableFrom(exception_class)) { 106 h_this->SetVerifyErrorClass(exception_class); 107 } 108 } 109 110 // Restore exception. 111 self->SetException(old_exception.Get()); 112 } 113 static_assert(sizeof(Status) == sizeof(uint32_t), "Size of status not equal to uint32"); 114 if (Runtime::Current()->IsActiveTransaction()) { 115 h_this->SetField32Volatile<true>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 116 } else { 117 h_this->SetField32Volatile<false>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 118 } 119 120 if (!class_linker_initialized) { 121 // When the class linker is being initialized its single threaded and by definition there can be 122 // no waiters. During initialization classes may appear temporary but won't be retired as their 123 // size was statically computed. 124 } else { 125 // Classes that are being resolved or initialized need to notify waiters that the class status 126 // changed. See ClassLinker::EnsureResolved and ClassLinker::WaitForInitializeClass. 127 if (h_this->IsTemp()) { 128 // Class is a temporary one, ensure that waiters for resolution get notified of retirement 129 // so that they can grab the new version of the class from the class linker's table. 130 CHECK_LT(new_status, kStatusResolved) << PrettyDescriptor(h_this.Get()); 131 if (new_status == kStatusRetired || new_status == kStatusError) { 132 h_this->NotifyAll(self); 133 } 134 } else { 135 CHECK_NE(new_status, kStatusRetired); 136 if (old_status >= kStatusResolved || new_status >= kStatusResolved) { 137 h_this->NotifyAll(self); 138 } 139 } 140 } 141} 142 143void Class::SetDexCache(DexCache* new_dex_cache) { 144 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache); 145 SetDexCacheStrings(new_dex_cache != nullptr ? new_dex_cache->GetStrings() : nullptr); 146} 147 148void Class::SetClassSize(uint32_t new_class_size) { 149 if (kIsDebugBuild && new_class_size < GetClassSize()) { 150 DumpClass(LOG(INTERNAL_FATAL), kDumpClassFullDetail); 151 LOG(INTERNAL_FATAL) << new_class_size << " vs " << GetClassSize(); 152 LOG(FATAL) << " class=" << PrettyTypeOf(this); 153 } 154 // Not called within a transaction. 155 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size); 156} 157 158// Return the class' name. The exact format is bizarre, but it's the specified behavior for 159// Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int" 160// but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than 161// slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness. 162String* Class::ComputeName(Handle<Class> h_this) { 163 String* name = h_this->GetName(); 164 if (name != nullptr) { 165 return name; 166 } 167 std::string temp; 168 const char* descriptor = h_this->GetDescriptor(&temp); 169 Thread* self = Thread::Current(); 170 if ((descriptor[0] != 'L') && (descriptor[0] != '[')) { 171 // The descriptor indicates that this is the class for 172 // a primitive type; special-case the return value. 173 const char* c_name = nullptr; 174 switch (descriptor[0]) { 175 case 'Z': c_name = "boolean"; break; 176 case 'B': c_name = "byte"; break; 177 case 'C': c_name = "char"; break; 178 case 'S': c_name = "short"; break; 179 case 'I': c_name = "int"; break; 180 case 'J': c_name = "long"; break; 181 case 'F': c_name = "float"; break; 182 case 'D': c_name = "double"; break; 183 case 'V': c_name = "void"; break; 184 default: 185 LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]); 186 } 187 name = String::AllocFromModifiedUtf8(self, c_name); 188 } else { 189 // Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package 190 // components. 191 name = String::AllocFromModifiedUtf8(self, DescriptorToDot(descriptor).c_str()); 192 } 193 h_this->SetName(name); 194 return name; 195} 196 197void Class::DumpClass(std::ostream& os, int flags) { 198 if ((flags & kDumpClassFullDetail) == 0) { 199 os << PrettyClass(this); 200 if ((flags & kDumpClassClassLoader) != 0) { 201 os << ' ' << GetClassLoader(); 202 } 203 if ((flags & kDumpClassInitialized) != 0) { 204 os << ' ' << GetStatus(); 205 } 206 os << "\n"; 207 return; 208 } 209 210 Thread* const self = Thread::Current(); 211 StackHandleScope<2> hs(self); 212 Handle<mirror::Class> h_this(hs.NewHandle(this)); 213 Handle<mirror::Class> h_super(hs.NewHandle(GetSuperClass())); 214 auto image_pointer_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize(); 215 216 std::string temp; 217 os << "----- " << (IsInterface() ? "interface" : "class") << " " 218 << "'" << GetDescriptor(&temp) << "' cl=" << GetClassLoader() << " -----\n", 219 os << " objectSize=" << SizeOf() << " " 220 << "(" << (h_super.Get() != nullptr ? h_super->SizeOf() : -1) << " from super)\n", 221 os << StringPrintf(" access=0x%04x.%04x\n", 222 GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask); 223 if (h_super.Get() != nullptr) { 224 os << " super='" << PrettyClass(h_super.Get()) << "' (cl=" << h_super->GetClassLoader() 225 << ")\n"; 226 } 227 if (IsArrayClass()) { 228 os << " componentType=" << PrettyClass(GetComponentType()) << "\n"; 229 } 230 const size_t num_direct_interfaces = NumDirectInterfaces(); 231 if (num_direct_interfaces > 0) { 232 os << " interfaces (" << num_direct_interfaces << "):\n"; 233 for (size_t i = 0; i < num_direct_interfaces; ++i) { 234 Class* interface = GetDirectInterface(self, h_this, i); 235 if (interface == nullptr) { 236 os << StringPrintf(" %2zd: nullptr!\n", i); 237 } else { 238 const ClassLoader* cl = interface->GetClassLoader(); 239 os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl); 240 } 241 } 242 } 243 if (!IsLoaded()) { 244 os << " class not yet loaded"; 245 } else { 246 // After this point, this may have moved due to GetDirectInterface. 247 os << " vtable (" << h_this->NumVirtualMethods() << " entries, " 248 << (h_super.Get() != nullptr ? h_super->NumVirtualMethods() : 0) << " in super):\n"; 249 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 250 os << StringPrintf(" %2zd: %s\n", i, PrettyMethod( 251 h_this->GetVirtualMethodDuringLinking(i, image_pointer_size)).c_str()); 252 } 253 os << " direct methods (" << h_this->NumDirectMethods() << " entries):\n"; 254 for (size_t i = 0; i < h_this->NumDirectMethods(); ++i) { 255 os << StringPrintf(" %2zd: %s\n", i, PrettyMethod( 256 h_this->GetDirectMethod(i, image_pointer_size)).c_str()); 257 } 258 if (h_this->NumStaticFields() > 0) { 259 os << " static fields (" << h_this->NumStaticFields() << " entries):\n"; 260 if (h_this->IsResolved() || h_this->IsErroneous()) { 261 for (size_t i = 0; i < h_this->NumStaticFields(); ++i) { 262 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetStaticField(i)).c_str()); 263 } 264 } else { 265 os << " <not yet available>"; 266 } 267 } 268 if (h_this->NumInstanceFields() > 0) { 269 os << " instance fields (" << h_this->NumInstanceFields() << " entries):\n"; 270 if (h_this->IsResolved() || h_this->IsErroneous()) { 271 for (size_t i = 0; i < h_this->NumInstanceFields(); ++i) { 272 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetInstanceField(i)).c_str()); 273 } 274 } else { 275 os << " <not yet available>"; 276 } 277 } 278 } 279} 280 281void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) { 282 if (kIsDebugBuild && new_reference_offsets != kClassWalkSuper) { 283 // Sanity check that the number of bits set in the reference offset bitmap 284 // agrees with the number of references 285 uint32_t count = 0; 286 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 287 count += c->NumReferenceInstanceFieldsDuringLinking(); 288 } 289 // +1 for the Class in Object. 290 CHECK_EQ(static_cast<uint32_t>(POPCOUNT(new_reference_offsets)) + 1, count); 291 } 292 // Not called within a transaction. 293 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_), 294 new_reference_offsets); 295} 296 297bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) { 298 size_t i = 0; 299 size_t min_length = std::min(descriptor1.size(), descriptor2.size()); 300 while (i < min_length && descriptor1[i] == descriptor2[i]) { 301 ++i; 302 } 303 if (descriptor1.find('/', i) != StringPiece::npos || 304 descriptor2.find('/', i) != StringPiece::npos) { 305 return false; 306 } else { 307 return true; 308 } 309} 310 311bool Class::IsInSamePackage(Class* that) { 312 Class* klass1 = this; 313 Class* klass2 = that; 314 if (klass1 == klass2) { 315 return true; 316 } 317 // Class loaders must match. 318 if (klass1->GetClassLoader() != klass2->GetClassLoader()) { 319 return false; 320 } 321 // Arrays are in the same package when their element classes are. 322 while (klass1->IsArrayClass()) { 323 klass1 = klass1->GetComponentType(); 324 } 325 while (klass2->IsArrayClass()) { 326 klass2 = klass2->GetComponentType(); 327 } 328 // trivial check again for array types 329 if (klass1 == klass2) { 330 return true; 331 } 332 // Compare the package part of the descriptor string. 333 std::string temp1, temp2; 334 return IsInSamePackage(klass1->GetDescriptor(&temp1), klass2->GetDescriptor(&temp2)); 335} 336 337bool Class::IsThrowableClass() { 338 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this); 339} 340 341void Class::SetClassLoader(ClassLoader* new_class_loader) { 342 if (Runtime::Current()->IsActiveTransaction()) { 343 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 344 } else { 345 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 346 } 347} 348 349ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature, 350 size_t pointer_size) { 351 // Check the current class before checking the interfaces. 352 ArtMethod* method = FindDeclaredVirtualMethod(name, signature, pointer_size); 353 if (method != nullptr) { 354 return method; 355 } 356 357 int32_t iftable_count = GetIfTableCount(); 358 IfTable* iftable = GetIfTable(); 359 for (int32_t i = 0; i < iftable_count; ++i) { 360 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature, pointer_size); 361 if (method != nullptr) { 362 return method; 363 } 364 } 365 return nullptr; 366} 367 368ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature, 369 size_t pointer_size) { 370 // Check the current class before checking the interfaces. 371 ArtMethod* method = FindDeclaredVirtualMethod(name, signature, pointer_size); 372 if (method != nullptr) { 373 return method; 374 } 375 376 int32_t iftable_count = GetIfTableCount(); 377 IfTable* iftable = GetIfTable(); 378 for (int32_t i = 0; i < iftable_count; ++i) { 379 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature, pointer_size); 380 if (method != nullptr) { 381 return method; 382 } 383 } 384 return nullptr; 385} 386 387ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx, 388 size_t pointer_size) { 389 // Check the current class before checking the interfaces. 390 ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx, pointer_size); 391 if (method != nullptr) { 392 return method; 393 } 394 395 int32_t iftable_count = GetIfTableCount(); 396 IfTable* iftable = GetIfTable(); 397 for (int32_t i = 0; i < iftable_count; ++i) { 398 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod( 399 dex_cache, dex_method_idx, pointer_size); 400 if (method != nullptr) { 401 return method; 402 } 403 } 404 return nullptr; 405} 406 407ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature, 408 size_t pointer_size) { 409 for (auto& method : GetDirectMethods(pointer_size)) { 410 if (name == method.GetName() && method.GetSignature() == signature) { 411 return &method; 412 } 413 } 414 return nullptr; 415} 416 417ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature, 418 size_t pointer_size) { 419 for (auto& method : GetDirectMethods(pointer_size)) { 420 if (name == method.GetName() && signature == method.GetSignature()) { 421 return &method; 422 } 423 } 424 return nullptr; 425} 426 427ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx, 428 size_t pointer_size) { 429 if (GetDexCache() == dex_cache) { 430 for (auto& method : GetDirectMethods(pointer_size)) { 431 if (method.GetDexMethodIndex() == dex_method_idx) { 432 return &method; 433 } 434 } 435 } 436 return nullptr; 437} 438 439ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature, 440 size_t pointer_size) { 441 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 442 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature, pointer_size); 443 if (method != nullptr) { 444 return method; 445 } 446 } 447 return nullptr; 448} 449 450ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature, 451 size_t pointer_size) { 452 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 453 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature, pointer_size); 454 if (method != nullptr) { 455 return method; 456 } 457 } 458 return nullptr; 459} 460 461ArtMethod* Class::FindDirectMethod( 462 const DexCache* dex_cache, uint32_t dex_method_idx, size_t pointer_size) { 463 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 464 ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx, pointer_size); 465 if (method != nullptr) { 466 return method; 467 } 468 } 469 return nullptr; 470} 471 472ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature, 473 size_t pointer_size) { 474 for (auto& method : GetVirtualMethods(pointer_size)) { 475 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size); 476 if (name == np_method->GetName() && np_method->GetSignature() == signature) { 477 return &method; 478 } 479 } 480 return nullptr; 481} 482 483ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature, 484 size_t pointer_size) { 485 for (auto& method : GetVirtualMethods(pointer_size)) { 486 ArtMethod* const np_method = method.GetInterfaceMethodIfProxy(pointer_size); 487 if (name == np_method->GetName() && signature == np_method->GetSignature()) { 488 return &method; 489 } 490 } 491 return nullptr; 492} 493 494ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx, 495 size_t pointer_size) { 496 if (GetDexCache() == dex_cache) { 497 for (auto& method : GetVirtualMethods(pointer_size)) { 498 // A miranda method may have a different DexCache and is always created by linking, 499 // never *declared* in the class. 500 if (method.GetDexMethodIndex() == dex_method_idx && !method.IsMiranda()) { 501 return &method; 502 } 503 } 504 } 505 return nullptr; 506} 507 508ArtMethod* Class::FindVirtualMethod( 509 const StringPiece& name, const StringPiece& signature, size_t pointer_size) { 510 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 511 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature, pointer_size); 512 if (method != nullptr) { 513 return method; 514 } 515 } 516 return nullptr; 517} 518 519ArtMethod* Class::FindVirtualMethod( 520 const StringPiece& name, const Signature& signature, size_t pointer_size) { 521 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 522 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature, pointer_size); 523 if (method != nullptr) { 524 return method; 525 } 526 } 527 return nullptr; 528} 529 530ArtMethod* Class::FindVirtualMethod( 531 const DexCache* dex_cache, uint32_t dex_method_idx, size_t pointer_size) { 532 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 533 ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx, pointer_size); 534 if (method != nullptr) { 535 return method; 536 } 537 } 538 return nullptr; 539} 540 541ArtMethod* Class::FindClassInitializer(size_t pointer_size) { 542 for (ArtMethod& method : GetDirectMethods(pointer_size)) { 543 if (method.IsClassInitializer()) { 544 DCHECK_STREQ(method.GetName(), "<clinit>"); 545 DCHECK_STREQ(method.GetSignature().ToString().c_str(), "()V"); 546 return &method; 547 } 548 } 549 return nullptr; 550} 551 552ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) { 553 // Is the field in this class? 554 // Interfaces are not relevant because they can't contain instance fields. 555 for (size_t i = 0; i < NumInstanceFields(); ++i) { 556 ArtField* f = GetInstanceField(i); 557 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 558 return f; 559 } 560 } 561 return nullptr; 562} 563 564ArtField* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 565 if (GetDexCache() == dex_cache) { 566 for (size_t i = 0; i < NumInstanceFields(); ++i) { 567 ArtField* f = GetInstanceField(i); 568 if (f->GetDexFieldIndex() == dex_field_idx) { 569 return f; 570 } 571 } 572 } 573 return nullptr; 574} 575 576ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) { 577 // Is the field in this class, or any of its superclasses? 578 // Interfaces are not relevant because they can't contain instance fields. 579 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 580 ArtField* f = c->FindDeclaredInstanceField(name, type); 581 if (f != nullptr) { 582 return f; 583 } 584 } 585 return nullptr; 586} 587 588ArtField* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 589 // Is the field in this class, or any of its superclasses? 590 // Interfaces are not relevant because they can't contain instance fields. 591 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 592 ArtField* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx); 593 if (f != nullptr) { 594 return f; 595 } 596 } 597 return nullptr; 598} 599 600ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) { 601 DCHECK(type != nullptr); 602 for (size_t i = 0; i < NumStaticFields(); ++i) { 603 ArtField* f = GetStaticField(i); 604 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 605 return f; 606 } 607 } 608 return nullptr; 609} 610 611ArtField* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) { 612 if (dex_cache == GetDexCache()) { 613 for (size_t i = 0; i < NumStaticFields(); ++i) { 614 ArtField* f = GetStaticField(i); 615 if (f->GetDexFieldIndex() == dex_field_idx) { 616 return f; 617 } 618 } 619 } 620 return nullptr; 621} 622 623ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const StringPiece& name, 624 const StringPiece& type) { 625 // Is the field in this class (or its interfaces), or any of its 626 // superclasses (or their interfaces)? 627 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 628 // Is the field in this class? 629 ArtField* f = k->FindDeclaredStaticField(name, type); 630 if (f != nullptr) { 631 return f; 632 } 633 // Wrap k incase it moves during GetDirectInterface. 634 StackHandleScope<1> hs(self); 635 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 636 // Is this field in any of this class' interfaces? 637 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 638 StackHandleScope<1> hs2(self); 639 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 640 f = FindStaticField(self, interface, name, type); 641 if (f != nullptr) { 642 return f; 643 } 644 } 645 } 646 return nullptr; 647} 648 649ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const DexCache* dex_cache, 650 uint32_t dex_field_idx) { 651 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 652 // Is the field in this class? 653 ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx); 654 if (f != nullptr) { 655 return f; 656 } 657 // Wrap k incase it moves during GetDirectInterface. 658 StackHandleScope<1> hs(self); 659 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 660 // Is this field in any of this class' interfaces? 661 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 662 StackHandleScope<1> hs2(self); 663 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 664 f = FindStaticField(self, interface, dex_cache, dex_field_idx); 665 if (f != nullptr) { 666 return f; 667 } 668 } 669 } 670 return nullptr; 671} 672 673ArtField* Class::FindField(Thread* self, Handle<Class> klass, const StringPiece& name, 674 const StringPiece& type) { 675 // Find a field using the JLS field resolution order 676 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 677 // Is the field in this class? 678 ArtField* f = k->FindDeclaredInstanceField(name, type); 679 if (f != nullptr) { 680 return f; 681 } 682 f = k->FindDeclaredStaticField(name, type); 683 if (f != nullptr) { 684 return f; 685 } 686 // Is this field in any of this class' interfaces? 687 StackHandleScope<1> hs(self); 688 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 689 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 690 StackHandleScope<1> hs2(self); 691 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 692 f = interface->FindStaticField(self, interface, name, type); 693 if (f != nullptr) { 694 return f; 695 } 696 } 697 } 698 return nullptr; 699} 700 701void Class::SetPreverifiedFlagOnAllMethods(size_t pointer_size) { 702 DCHECK(IsVerified()); 703 for (auto& m : GetDirectMethods(pointer_size)) { 704 if (!m.IsNative() && !m.IsAbstract()) { 705 m.SetPreverified(); 706 } 707 } 708 for (auto& m : GetVirtualMethods(pointer_size)) { 709 if (!m.IsNative() && !m.IsAbstract()) { 710 m.SetPreverified(); 711 } 712 } 713} 714 715const char* Class::GetDescriptor(std::string* storage) { 716 if (IsPrimitive()) { 717 return Primitive::Descriptor(GetPrimitiveType()); 718 } else if (IsArrayClass()) { 719 return GetArrayDescriptor(storage); 720 } else if (IsProxyClass()) { 721 *storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this); 722 return storage->c_str(); 723 } else { 724 const DexFile& dex_file = GetDexFile(); 725 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_); 726 return dex_file.GetTypeDescriptor(type_id); 727 } 728} 729 730const char* Class::GetArrayDescriptor(std::string* storage) { 731 std::string temp; 732 const char* elem_desc = GetComponentType()->GetDescriptor(&temp); 733 *storage = "["; 734 *storage += elem_desc; 735 return storage->c_str(); 736} 737 738const DexFile::ClassDef* Class::GetClassDef() { 739 uint16_t class_def_idx = GetDexClassDefIndex(); 740 if (class_def_idx == DexFile::kDexNoIndex16) { 741 return nullptr; 742 } 743 return &GetDexFile().GetClassDef(class_def_idx); 744} 745 746uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) { 747 DCHECK(!IsPrimitive()); 748 DCHECK(!IsArrayClass()); 749 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_; 750} 751 752mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass, 753 uint32_t idx) { 754 DCHECK(klass.Get() != nullptr); 755 DCHECK(!klass->IsPrimitive()); 756 if (klass->IsArrayClass()) { 757 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 758 if (idx == 0) { 759 return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;"); 760 } else { 761 DCHECK_EQ(1U, idx); 762 return class_linker->FindSystemClass(self, "Ljava/io/Serializable;"); 763 } 764 } else if (klass->IsProxyClass()) { 765 mirror::ObjectArray<mirror::Class>* interfaces = klass.Get()->GetInterfaces(); 766 DCHECK(interfaces != nullptr); 767 return interfaces->Get(idx); 768 } else { 769 uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx); 770 mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx); 771 if (interface == nullptr) { 772 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx, 773 klass.Get()); 774 CHECK(interface != nullptr || self->IsExceptionPending()); 775 } 776 return interface; 777 } 778} 779 780const char* Class::GetSourceFile() { 781 const DexFile& dex_file = GetDexFile(); 782 const DexFile::ClassDef* dex_class_def = GetClassDef(); 783 if (dex_class_def == nullptr) { 784 // Generated classes have no class def. 785 return nullptr; 786 } 787 return dex_file.GetSourceFile(*dex_class_def); 788} 789 790std::string Class::GetLocation() { 791 mirror::DexCache* dex_cache = GetDexCache(); 792 if (dex_cache != nullptr && !IsProxyClass()) { 793 return dex_cache->GetLocation()->ToModifiedUtf8(); 794 } 795 // Arrays and proxies are generated and have no corresponding dex file location. 796 return "generated class"; 797} 798 799const DexFile::TypeList* Class::GetInterfaceTypeList() { 800 const DexFile::ClassDef* class_def = GetClassDef(); 801 if (class_def == nullptr) { 802 return nullptr; 803 } 804 return GetDexFile().GetInterfacesList(*class_def); 805} 806 807void Class::PopulateEmbeddedImtAndVTable(ArtMethod* const (&methods)[kImtSize], 808 size_t pointer_size) { 809 for (size_t i = 0; i < kImtSize; i++) { 810 auto method = methods[i]; 811 DCHECK(method != nullptr); 812 SetEmbeddedImTableEntry(i, method, pointer_size); 813 } 814 PointerArray* table = GetVTableDuringLinking(); 815 CHECK(table != nullptr) << PrettyClass(this); 816 const size_t table_length = table->GetLength(); 817 SetEmbeddedVTableLength(table_length); 818 for (size_t i = 0; i < table_length; i++) { 819 SetEmbeddedVTableEntry(i, table->GetElementPtrSize<ArtMethod*>(i, pointer_size), pointer_size); 820 } 821 // Keep java.lang.Object class's vtable around for since it's easier 822 // to be reused by array classes during their linking. 823 if (!IsObjectClass()) { 824 SetVTable(nullptr); 825 } 826} 827 828class ReadBarrierOnNativeRootsVisitor { 829 public: 830 void operator()(mirror::Object* obj ATTRIBUTE_UNUSED, 831 MemberOffset offset ATTRIBUTE_UNUSED, 832 bool is_static ATTRIBUTE_UNUSED) const {} 833 834 void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root) const 835 SHARED_REQUIRES(Locks::mutator_lock_) { 836 if (!root->IsNull()) { 837 VisitRoot(root); 838 } 839 } 840 841 void VisitRoot(mirror::CompressedReference<mirror::Object>* root) const 842 SHARED_REQUIRES(Locks::mutator_lock_) { 843 mirror::Object* old_ref = root->AsMirrorPtr(); 844 mirror::Object* new_ref = ReadBarrier::BarrierForRoot(root); 845 if (old_ref != new_ref) { 846 // Update the field atomically. This may fail if mutator updates before us, but it's ok. 847 auto* atomic_root = 848 reinterpret_cast<Atomic<mirror::CompressedReference<mirror::Object>>*>(root); 849 atomic_root->CompareExchangeStrongSequentiallyConsistent( 850 mirror::CompressedReference<mirror::Object>::FromMirrorPtr(old_ref), 851 mirror::CompressedReference<mirror::Object>::FromMirrorPtr(new_ref)); 852 } 853 } 854}; 855 856// The pre-fence visitor for Class::CopyOf(). 857class CopyClassVisitor { 858 public: 859 CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig, size_t new_length, 860 size_t copy_bytes, ArtMethod* const (&imt)[mirror::Class::kImtSize], 861 size_t pointer_size) 862 : self_(self), orig_(orig), new_length_(new_length), 863 copy_bytes_(copy_bytes), imt_(imt), pointer_size_(pointer_size) { 864 } 865 866 void operator()(mirror::Object* obj, size_t usable_size ATTRIBUTE_UNUSED) const 867 SHARED_REQUIRES(Locks::mutator_lock_) { 868 StackHandleScope<1> hs(self_); 869 Handle<mirror::Class> h_new_class_obj(hs.NewHandle(obj->AsClass())); 870 mirror::Object::CopyObject(self_, h_new_class_obj.Get(), orig_->Get(), copy_bytes_); 871 mirror::Class::SetStatus(h_new_class_obj, Class::kStatusResolving, self_); 872 h_new_class_obj->PopulateEmbeddedImtAndVTable(imt_, pointer_size_); 873 h_new_class_obj->SetClassSize(new_length_); 874 // Visit all of the references to make sure there is no from space references in the native 875 // roots. 876 static_cast<mirror::Object*>(h_new_class_obj.Get())->VisitReferences( 877 ReadBarrierOnNativeRootsVisitor(), VoidFunctor()); 878 } 879 880 private: 881 Thread* const self_; 882 Handle<mirror::Class>* const orig_; 883 const size_t new_length_; 884 const size_t copy_bytes_; 885 ArtMethod* const (&imt_)[mirror::Class::kImtSize]; 886 const size_t pointer_size_; 887 DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor); 888}; 889 890Class* Class::CopyOf(Thread* self, int32_t new_length, 891 ArtMethod* const (&imt)[mirror::Class::kImtSize], size_t pointer_size) { 892 DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class))); 893 // We may get copied by a compacting GC. 894 StackHandleScope<1> hs(self); 895 Handle<mirror::Class> h_this(hs.NewHandle(this)); 896 gc::Heap* heap = Runtime::Current()->GetHeap(); 897 // The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf() 898 // to skip copying the tail part that we will overwrite here. 899 CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class), imt, pointer_size); 900 mirror::Object* new_class = kMovingClasses ? 901 heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor) : 902 heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor); 903 if (UNLIKELY(new_class == nullptr)) { 904 self->AssertPendingOOMException(); 905 return nullptr; 906 } 907 return new_class->AsClass(); 908} 909 910bool Class::ProxyDescriptorEquals(const char* match) { 911 DCHECK(IsProxyClass()); 912 return Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this) == match; 913} 914 915// TODO: Move this to java_lang_Class.cc? 916ArtMethod* Class::GetDeclaredConstructor( 917 Thread* self, Handle<mirror::ObjectArray<mirror::Class>> args) { 918 for (auto& m : GetDirectMethods(sizeof(void*))) { 919 // Skip <clinit> which is a static constructor, as well as non constructors. 920 if (m.IsStatic() || !m.IsConstructor()) { 921 continue; 922 } 923 // May cause thread suspension and exceptions. 924 if (m.GetInterfaceMethodIfProxy(sizeof(void*))->EqualParameters(args)) { 925 return &m; 926 } 927 if (UNLIKELY(self->IsExceptionPending())) { 928 return nullptr; 929 } 930 } 931 return nullptr; 932} 933 934uint32_t Class::Depth() { 935 uint32_t depth = 0; 936 for (Class* klass = this; klass->GetSuperClass() != nullptr; klass = klass->GetSuperClass()) { 937 depth++; 938 } 939 return depth; 940} 941 942} // namespace mirror 943} // namespace art 944