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.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 "object_array-inl.h" 29 #include "object-inl.h" 30 #include "runtime.h" 31 #include "thread.h" 32 #include "throwable.h" 33 #include "utils.h" 34 #include "well_known_classes.h" 35 36 namespace art { 37 namespace mirror { 38 39 GcRoot<Class> Class::java_lang_Class_; 40 41 void Class::SetClassClass(Class* java_lang_Class) { 42 CHECK(java_lang_Class_.IsNull()) 43 << java_lang_Class_.Read() 44 << " " << java_lang_Class; 45 CHECK(java_lang_Class != nullptr); 46 java_lang_Class_ = GcRoot<Class>(java_lang_Class); 47 } 48 49 void Class::ResetClass() { 50 CHECK(!java_lang_Class_.IsNull()); 51 java_lang_Class_ = GcRoot<Class>(nullptr); 52 } 53 54 void Class::VisitRoots(RootCallback* callback, void* arg) { 55 if (!java_lang_Class_.IsNull()) { 56 java_lang_Class_.VisitRoot(callback, arg, 0, kRootStickyClass); 57 } 58 } 59 60 void Class::SetStatus(Status new_status, Thread* self) { 61 Status old_status = 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(this) << " " 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(GetLockOwnerThreadId(), self->GetThreadId()) 73 << "Attempt to change status of class while not holding its lock: " 74 << PrettyClass(this) << " " << old_status << " -> " << new_status; 75 } 76 } 77 if (UNLIKELY(new_status == kStatusError)) { 78 CHECK_NE(GetStatus(), kStatusError) 79 << "Attempt to set as erroneous an already erroneous class " << PrettyClass(this); 80 81 // Stash current exception. 82 StackHandleScope<3> hs(self); 83 ThrowLocation old_throw_location; 84 Handle<mirror::Throwable> old_exception(hs.NewHandle(self->GetException(&old_throw_location))); 85 CHECK(old_exception.Get() != nullptr); 86 Handle<mirror::Object> old_throw_this_object(hs.NewHandle(old_throw_location.GetThis())); 87 Handle<mirror::ArtMethod> old_throw_method(hs.NewHandle(old_throw_location.GetMethod())); 88 uint32_t old_throw_dex_pc = old_throw_location.GetDexPc(); 89 bool is_exception_reported = self->IsExceptionReportedToInstrumentation(); 90 Class* eiie_class; 91 // Do't attempt to use FindClass if we have an OOM error since this can try to do more 92 // allocations and may cause infinite loops. 93 bool throw_eiie = (old_exception.Get() == nullptr); 94 if (!throw_eiie) { 95 std::string temp; 96 const char* old_exception_descriptor = old_exception->GetClass()->GetDescriptor(&temp); 97 throw_eiie = (strcmp(old_exception_descriptor, "Ljava/lang/OutOfMemoryError;") != 0); 98 } 99 if (throw_eiie) { 100 // Clear exception to call FindSystemClass. 101 self->ClearException(); 102 eiie_class = Runtime::Current()->GetClassLinker()->FindSystemClass( 103 self, "Ljava/lang/ExceptionInInitializerError;"); 104 CHECK(!self->IsExceptionPending()); 105 // Only verification errors, not initialization problems, should set a verify error. 106 // This is to ensure that ThrowEarlierClassFailure will throw NoClassDefFoundError in that 107 // case. 108 Class* exception_class = old_exception->GetClass(); 109 if (!eiie_class->IsAssignableFrom(exception_class)) { 110 SetVerifyErrorClass(exception_class); 111 } 112 } 113 114 // Restore exception. 115 ThrowLocation gc_safe_throw_location(old_throw_this_object.Get(), old_throw_method.Get(), 116 old_throw_dex_pc); 117 self->SetException(gc_safe_throw_location, old_exception.Get()); 118 self->SetExceptionReportedToInstrumentation(is_exception_reported); 119 } 120 COMPILE_ASSERT(sizeof(Status) == sizeof(uint32_t), size_of_status_not_uint32); 121 if (Runtime::Current()->IsActiveTransaction()) { 122 SetField32Volatile<true>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 123 } else { 124 SetField32Volatile<false>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 125 } 126 127 if (!class_linker_initialized) { 128 // When the class linker is being initialized its single threaded and by definition there can be 129 // no waiters. During initialization classes may appear temporary but won't be retired as their 130 // size was statically computed. 131 } else { 132 // Classes that are being resolved or initialized need to notify waiters that the class status 133 // changed. See ClassLinker::EnsureResolved and ClassLinker::WaitForInitializeClass. 134 if (IsTemp()) { 135 // Class is a temporary one, ensure that waiters for resolution get notified of retirement 136 // so that they can grab the new version of the class from the class linker's table. 137 CHECK_LT(new_status, kStatusResolved) << PrettyDescriptor(this); 138 if (new_status == kStatusRetired || new_status == kStatusError) { 139 NotifyAll(self); 140 } 141 } else { 142 CHECK_NE(new_status, kStatusRetired); 143 if (old_status >= kStatusResolved || new_status >= kStatusResolved) { 144 NotifyAll(self); 145 } 146 } 147 } 148 } 149 150 void Class::SetDexCache(DexCache* new_dex_cache) { 151 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache); 152 } 153 154 void Class::SetClassSize(uint32_t new_class_size) { 155 if (kIsDebugBuild && (new_class_size < GetClassSize())) { 156 DumpClass(LOG(ERROR), kDumpClassFullDetail); 157 CHECK_GE(new_class_size, GetClassSize()) << " class=" << PrettyTypeOf(this); 158 } 159 // Not called within a transaction. 160 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size); 161 } 162 163 // Return the class' name. The exact format is bizarre, but it's the specified behavior for 164 // Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int" 165 // but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than 166 // slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness. 167 String* Class::ComputeName(Handle<Class> h_this) { 168 String* name = h_this->GetName(); 169 if (name != nullptr) { 170 return name; 171 } 172 std::string temp; 173 const char* descriptor = h_this->GetDescriptor(&temp); 174 Thread* self = Thread::Current(); 175 if ((descriptor[0] != 'L') && (descriptor[0] != '[')) { 176 // The descriptor indicates that this is the class for 177 // a primitive type; special-case the return value. 178 const char* c_name = nullptr; 179 switch (descriptor[0]) { 180 case 'Z': c_name = "boolean"; break; 181 case 'B': c_name = "byte"; break; 182 case 'C': c_name = "char"; break; 183 case 'S': c_name = "short"; break; 184 case 'I': c_name = "int"; break; 185 case 'J': c_name = "long"; break; 186 case 'F': c_name = "float"; break; 187 case 'D': c_name = "double"; break; 188 case 'V': c_name = "void"; break; 189 default: 190 LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]); 191 } 192 name = String::AllocFromModifiedUtf8(self, c_name); 193 } else { 194 // Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package 195 // components. 196 name = String::AllocFromModifiedUtf8(self, DescriptorToDot(descriptor).c_str()); 197 } 198 h_this->SetName(name); 199 return name; 200 } 201 202 void Class::DumpClass(std::ostream& os, int flags) { 203 if ((flags & kDumpClassFullDetail) == 0) { 204 os << PrettyClass(this); 205 if ((flags & kDumpClassClassLoader) != 0) { 206 os << ' ' << GetClassLoader(); 207 } 208 if ((flags & kDumpClassInitialized) != 0) { 209 os << ' ' << GetStatus(); 210 } 211 os << "\n"; 212 return; 213 } 214 215 Thread* self = Thread::Current(); 216 StackHandleScope<2> hs(self); 217 Handle<mirror::Class> h_this(hs.NewHandle(this)); 218 Handle<mirror::Class> h_super(hs.NewHandle(GetSuperClass())); 219 220 std::string temp; 221 os << "----- " << (IsInterface() ? "interface" : "class") << " " 222 << "'" << GetDescriptor(&temp) << "' cl=" << GetClassLoader() << " -----\n", 223 os << " objectSize=" << SizeOf() << " " 224 << "(" << (h_super.Get() != nullptr ? h_super->SizeOf() : -1) << " from super)\n", 225 os << StringPrintf(" access=0x%04x.%04x\n", 226 GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask); 227 if (h_super.Get() != nullptr) { 228 os << " super='" << PrettyClass(h_super.Get()) << "' (cl=" << h_super->GetClassLoader() 229 << ")\n"; 230 } 231 if (IsArrayClass()) { 232 os << " componentType=" << PrettyClass(GetComponentType()) << "\n"; 233 } 234 const size_t num_direct_interfaces = NumDirectInterfaces(); 235 if (num_direct_interfaces > 0) { 236 os << " interfaces (" << num_direct_interfaces << "):\n"; 237 for (size_t i = 0; i < num_direct_interfaces; ++i) { 238 Class* interface = GetDirectInterface(self, h_this, i); 239 const ClassLoader* cl = interface->GetClassLoader(); 240 os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl); 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, 251 PrettyMethod(h_this->GetVirtualMethodDuringLinking(i)).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(h_this->GetDirectMethod(i)).c_str()); 256 } 257 if (h_this->NumStaticFields() > 0) { 258 os << " static fields (" << h_this->NumStaticFields() << " entries):\n"; 259 if (h_this->IsResolved() || h_this->IsErroneous()) { 260 for (size_t i = 0; i < h_this->NumStaticFields(); ++i) { 261 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetStaticField(i)).c_str()); 262 } 263 } else { 264 os << " <not yet available>"; 265 } 266 } 267 if (h_this->NumInstanceFields() > 0) { 268 os << " instance fields (" << h_this->NumInstanceFields() << " entries):\n"; 269 if (h_this->IsResolved() || h_this->IsErroneous()) { 270 for (size_t i = 0; i < h_this->NumInstanceFields(); ++i) { 271 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetInstanceField(i)).c_str()); 272 } 273 } else { 274 os << " <not yet available>"; 275 } 276 } 277 } 278 } 279 280 void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) { 281 if (new_reference_offsets != CLASS_WALK_SUPER) { 282 // Sanity check that the number of bits set in the reference offset bitmap 283 // agrees with the number of references 284 size_t count = 0; 285 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 286 count += c->NumReferenceInstanceFieldsDuringLinking(); 287 } 288 CHECK_EQ((size_t)POPCOUNT(new_reference_offsets), count); 289 } 290 // Not called within a transaction. 291 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_), 292 new_reference_offsets); 293 } 294 295 void Class::SetReferenceStaticOffsets(uint32_t new_reference_offsets) { 296 if (new_reference_offsets != CLASS_WALK_SUPER) { 297 // Sanity check that the number of bits set in the reference offset bitmap 298 // agrees with the number of references 299 CHECK_EQ((size_t)POPCOUNT(new_reference_offsets), 300 NumReferenceStaticFieldsDuringLinking()); 301 } 302 // Not called within a transaction. 303 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_static_offsets_), 304 new_reference_offsets); 305 } 306 307 bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) { 308 size_t i = 0; 309 while (descriptor1[i] != '\0' && descriptor1[i] == descriptor2[i]) { 310 ++i; 311 } 312 if (descriptor1.find('/', i) != StringPiece::npos || 313 descriptor2.find('/', i) != StringPiece::npos) { 314 return false; 315 } else { 316 return true; 317 } 318 } 319 320 bool Class::IsInSamePackage(Class* that) { 321 Class* klass1 = this; 322 Class* klass2 = that; 323 if (klass1 == klass2) { 324 return true; 325 } 326 // Class loaders must match. 327 if (klass1->GetClassLoader() != klass2->GetClassLoader()) { 328 return false; 329 } 330 // Arrays are in the same package when their element classes are. 331 while (klass1->IsArrayClass()) { 332 klass1 = klass1->GetComponentType(); 333 } 334 while (klass2->IsArrayClass()) { 335 klass2 = klass2->GetComponentType(); 336 } 337 // trivial check again for array types 338 if (klass1 == klass2) { 339 return true; 340 } 341 // Compare the package part of the descriptor string. 342 std::string temp1, temp2; 343 return IsInSamePackage(klass1->GetDescriptor(&temp1), klass2->GetDescriptor(&temp2)); 344 } 345 346 bool Class::IsStringClass() const { 347 return this == String::GetJavaLangString(); 348 } 349 350 bool Class::IsThrowableClass() { 351 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this); 352 } 353 354 void Class::SetClassLoader(ClassLoader* new_class_loader) { 355 if (Runtime::Current()->IsActiveTransaction()) { 356 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 357 } else { 358 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 359 } 360 } 361 362 ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature) { 363 // Check the current class before checking the interfaces. 364 ArtMethod* method = FindDeclaredVirtualMethod(name, signature); 365 if (method != nullptr) { 366 return method; 367 } 368 369 int32_t iftable_count = GetIfTableCount(); 370 IfTable* iftable = GetIfTable(); 371 for (int32_t i = 0; i < iftable_count; ++i) { 372 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature); 373 if (method != nullptr) { 374 return method; 375 } 376 } 377 return nullptr; 378 } 379 380 ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature) { 381 // Check the current class before checking the interfaces. 382 ArtMethod* method = FindDeclaredVirtualMethod(name, signature); 383 if (method != nullptr) { 384 return method; 385 } 386 387 int32_t iftable_count = GetIfTableCount(); 388 IfTable* iftable = GetIfTable(); 389 for (int32_t i = 0; i < iftable_count; ++i) { 390 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature); 391 if (method != nullptr) { 392 return method; 393 } 394 } 395 return nullptr; 396 } 397 398 ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 399 // Check the current class before checking the interfaces. 400 ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 401 if (method != nullptr) { 402 return method; 403 } 404 405 int32_t iftable_count = GetIfTableCount(); 406 IfTable* iftable = GetIfTable(); 407 for (int32_t i = 0; i < iftable_count; ++i) { 408 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 409 if (method != nullptr) { 410 return method; 411 } 412 } 413 return nullptr; 414 } 415 416 ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature) { 417 for (size_t i = 0; i < NumDirectMethods(); ++i) { 418 ArtMethod* method = GetDirectMethod(i); 419 if (name == method->GetName() && method->GetSignature() == signature) { 420 return method; 421 } 422 } 423 return nullptr; 424 } 425 426 ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature) { 427 for (size_t i = 0; i < NumDirectMethods(); ++i) { 428 ArtMethod* method = GetDirectMethod(i); 429 if (name == method->GetName() && signature == method->GetSignature()) { 430 return method; 431 } 432 } 433 return nullptr; 434 } 435 436 ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 437 if (GetDexCache() == dex_cache) { 438 for (size_t i = 0; i < NumDirectMethods(); ++i) { 439 ArtMethod* method = GetDirectMethod(i); 440 if (method->GetDexMethodIndex() == dex_method_idx) { 441 return method; 442 } 443 } 444 } 445 return nullptr; 446 } 447 448 ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature) { 449 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 450 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature); 451 if (method != nullptr) { 452 return method; 453 } 454 } 455 return nullptr; 456 } 457 458 ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature) { 459 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 460 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature); 461 if (method != nullptr) { 462 return method; 463 } 464 } 465 return nullptr; 466 } 467 468 ArtMethod* Class::FindDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 469 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 470 ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx); 471 if (method != nullptr) { 472 return method; 473 } 474 } 475 return nullptr; 476 } 477 478 ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature) { 479 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 480 ArtMethod* method = GetVirtualMethod(i); 481 if (name == method->GetName() && method->GetSignature() == signature) { 482 return method; 483 } 484 } 485 return nullptr; 486 } 487 488 ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature) { 489 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 490 ArtMethod* method = GetVirtualMethod(i); 491 if (name == method->GetName() && signature == method->GetSignature()) { 492 return method; 493 } 494 } 495 return nullptr; 496 } 497 498 ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 499 if (GetDexCache() == dex_cache) { 500 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 501 ArtMethod* method = GetVirtualMethod(i); 502 if (method->GetDexMethodIndex() == dex_method_idx) { 503 return method; 504 } 505 } 506 } 507 return nullptr; 508 } 509 510 ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const StringPiece& signature) { 511 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 512 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 513 if (method != nullptr) { 514 return method; 515 } 516 } 517 return nullptr; 518 } 519 520 ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const Signature& signature) { 521 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 522 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 523 if (method != nullptr) { 524 return method; 525 } 526 } 527 return nullptr; 528 } 529 530 ArtMethod* Class::FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 531 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 532 ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 533 if (method != nullptr) { 534 return method; 535 } 536 } 537 return nullptr; 538 } 539 540 ArtMethod* Class::FindClassInitializer() { 541 for (size_t i = 0; i < NumDirectMethods(); ++i) { 542 ArtMethod* method = GetDirectMethod(i); 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 } 551 552 ArtField* 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 } 563 564 ArtField* 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 } 575 576 ArtField* 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 } 587 588 ArtField* 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 } 599 600 ArtField* 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 } 610 611 ArtField* 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 } 622 623 ArtField* 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> hs(self); 639 Handle<mirror::Class> interface(hs.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 } 648 649 ArtField* 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> hs(self); 663 Handle<mirror::Class> interface(hs.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 } 672 673 ArtField* 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> hs(self); 691 Handle<mirror::Class> interface(hs.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 } 700 701 static void SetPreverifiedFlagOnMethods(mirror::ObjectArray<mirror::ArtMethod>* methods) 702 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 703 if (methods != nullptr) { 704 for (int32_t index = 0, end = methods->GetLength(); index < end; ++index) { 705 mirror::ArtMethod* method = methods->GetWithoutChecks(index); 706 DCHECK(method != nullptr); 707 if (!method->IsNative() && !method->IsAbstract()) { 708 method->SetPreverified(); 709 } 710 } 711 } 712 } 713 714 void Class::SetPreverifiedFlagOnAllMethods() { 715 DCHECK(IsVerified()); 716 SetPreverifiedFlagOnMethods(GetDirectMethods()); 717 SetPreverifiedFlagOnMethods(GetVirtualMethods()); 718 } 719 720 const char* Class::GetDescriptor(std::string* storage) { 721 if (IsPrimitive()) { 722 return Primitive::Descriptor(GetPrimitiveType()); 723 } else if (IsArrayClass()) { 724 return GetArrayDescriptor(storage); 725 } else if (IsProxyClass()) { 726 *storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this); 727 return storage->c_str(); 728 } else { 729 const DexFile& dex_file = GetDexFile(); 730 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_); 731 return dex_file.GetTypeDescriptor(type_id); 732 } 733 } 734 735 const char* Class::GetArrayDescriptor(std::string* storage) { 736 std::string temp; 737 const char* elem_desc = GetComponentType()->GetDescriptor(&temp); 738 *storage = "["; 739 *storage += elem_desc; 740 return storage->c_str(); 741 } 742 743 const DexFile::ClassDef* Class::GetClassDef() { 744 uint16_t class_def_idx = GetDexClassDefIndex(); 745 if (class_def_idx == DexFile::kDexNoIndex16) { 746 return nullptr; 747 } 748 return &GetDexFile().GetClassDef(class_def_idx); 749 } 750 751 uint32_t Class::NumDirectInterfaces() { 752 if (IsPrimitive()) { 753 return 0; 754 } else if (IsArrayClass()) { 755 return 2; 756 } else if (IsProxyClass()) { 757 mirror::ObjectArray<mirror::Class>* interfaces = GetInterfaces(); 758 return interfaces != nullptr ? interfaces->GetLength() : 0; 759 } else { 760 const DexFile::TypeList* interfaces = GetInterfaceTypeList(); 761 if (interfaces == nullptr) { 762 return 0; 763 } else { 764 return interfaces->Size(); 765 } 766 } 767 } 768 769 uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) { 770 DCHECK(!IsPrimitive()); 771 DCHECK(!IsArrayClass()); 772 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_; 773 } 774 775 mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass, uint32_t idx) { 776 DCHECK(klass.Get() != nullptr); 777 DCHECK(!klass->IsPrimitive()); 778 if (klass->IsArrayClass()) { 779 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 780 if (idx == 0) { 781 return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;"); 782 } else { 783 DCHECK_EQ(1U, idx); 784 return class_linker->FindSystemClass(self, "Ljava/io/Serializable;"); 785 } 786 } else if (klass->IsProxyClass()) { 787 mirror::ObjectArray<mirror::Class>* interfaces = klass.Get()->GetInterfaces(); 788 DCHECK(interfaces != nullptr); 789 return interfaces->Get(idx); 790 } else { 791 uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx); 792 mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx); 793 if (interface == nullptr) { 794 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx, 795 klass.Get()); 796 CHECK(interface != nullptr || self->IsExceptionPending()); 797 } 798 return interface; 799 } 800 } 801 802 const char* Class::GetSourceFile() { 803 const DexFile& dex_file = GetDexFile(); 804 const DexFile::ClassDef* dex_class_def = GetClassDef(); 805 if (dex_class_def == nullptr) { 806 // Generated classes have no class def. 807 return nullptr; 808 } 809 return dex_file.GetSourceFile(*dex_class_def); 810 } 811 812 std::string Class::GetLocation() { 813 mirror::DexCache* dex_cache = GetDexCache(); 814 if (dex_cache != nullptr && !IsProxyClass()) { 815 return dex_cache->GetLocation()->ToModifiedUtf8(); 816 } 817 // Arrays and proxies are generated and have no corresponding dex file location. 818 return "generated class"; 819 } 820 821 const DexFile::TypeList* Class::GetInterfaceTypeList() { 822 const DexFile::ClassDef* class_def = GetClassDef(); 823 if (class_def == nullptr) { 824 return nullptr; 825 } 826 return GetDexFile().GetInterfacesList(*class_def); 827 } 828 829 void Class::PopulateEmbeddedImtAndVTable() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 830 ObjectArray<ArtMethod>* table = GetImTable(); 831 if (table != nullptr) { 832 for (uint32_t i = 0; i < kImtSize; i++) { 833 SetEmbeddedImTableEntry(i, table->Get(i)); 834 } 835 } 836 837 table = GetVTableDuringLinking(); 838 CHECK(table != nullptr) << PrettyClass(this); 839 SetEmbeddedVTableLength(table->GetLength()); 840 for (int32_t i = 0; i < table->GetLength(); i++) { 841 SetEmbeddedVTableEntry(i, table->Get(i)); 842 } 843 844 SetImTable(nullptr); 845 // Keep java.lang.Object class's vtable around for since it's easier 846 // to be reused by array classes during their linking. 847 if (!IsObjectClass()) { 848 SetVTable(nullptr); 849 } 850 } 851 852 // The pre-fence visitor for Class::CopyOf(). 853 class CopyClassVisitor { 854 public: 855 explicit CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig, 856 size_t new_length, size_t copy_bytes) 857 : self_(self), orig_(orig), new_length_(new_length), 858 copy_bytes_(copy_bytes) { 859 } 860 861 void operator()(Object* obj, size_t usable_size) const 862 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 863 UNUSED(usable_size); 864 mirror::Class* new_class_obj = obj->AsClass(); 865 mirror::Object::CopyObject(self_, new_class_obj, orig_->Get(), copy_bytes_); 866 new_class_obj->SetStatus(Class::kStatusResolving, self_); 867 new_class_obj->PopulateEmbeddedImtAndVTable(); 868 new_class_obj->SetClassSize(new_length_); 869 } 870 871 private: 872 Thread* const self_; 873 Handle<mirror::Class>* const orig_; 874 const size_t new_length_; 875 const size_t copy_bytes_; 876 DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor); 877 }; 878 879 Class* Class::CopyOf(Thread* self, int32_t new_length) { 880 DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class))); 881 // We may get copied by a compacting GC. 882 StackHandleScope<1> hs(self); 883 Handle<mirror::Class> h_this(hs.NewHandle(this)); 884 gc::Heap* heap = Runtime::Current()->GetHeap(); 885 // The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf() 886 // to skip copying the tail part that we will overwrite here. 887 CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class)); 888 889 mirror::Object* new_class = 890 kMovingClasses 891 ? heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor) 892 : heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor); 893 if (UNLIKELY(new_class == nullptr)) { 894 CHECK(self->IsExceptionPending()); // Expect an OOME. 895 return NULL; 896 } 897 898 return new_class->AsClass(); 899 } 900 901 } // namespace mirror 902 } // namespace art 903