class.cc revision 1d0611c7e6721bd9115d652da74d2584ff3f192b
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 36namespace art { 37namespace mirror { 38 39GcRoot<Class> Class::java_lang_Class_; 40 41void 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 49void Class::ResetClass() { 50 CHECK(!java_lang_Class_.IsNull()); 51 java_lang_Class_ = GcRoot<Class>(nullptr); 52} 53 54void Class::VisitRoots(RootCallback* callback, void* arg) { 55 if (!java_lang_Class_.IsNull()) { 56 java_lang_Class_.VisitRoot(callback, arg, 0, kRootStickyClass); 57 } 58} 59 60void 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 150void Class::SetDexCache(DexCache* new_dex_cache) { 151 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache); 152} 153 154void 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. 167String* 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 202void 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 280void 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 295void 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 307bool 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 320bool 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 346bool Class::IsStringClass() const { 347 return this == String::GetJavaLangString(); 348} 349 350bool Class::IsThrowableClass() { 351 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this); 352} 353 354void 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 362ArtMethod* 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 380ArtMethod* 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 398ArtMethod* 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 416ArtMethod* 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 426ArtMethod* 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 436ArtMethod* 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 448ArtMethod* 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 458ArtMethod* 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 468ArtMethod* 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 478ArtMethod* 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 488ArtMethod* 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 498ArtMethod* 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 // A miranda method may have a different DexCache and is always created by linking, 504 // never *declared* in the class. 505 !method->IsMiranda()) { 506 return method; 507 } 508 } 509 } 510 return nullptr; 511} 512 513ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const StringPiece& signature) { 514 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 515 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 516 if (method != nullptr) { 517 return method; 518 } 519 } 520 return nullptr; 521} 522 523ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const Signature& signature) { 524 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 525 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 526 if (method != nullptr) { 527 return method; 528 } 529 } 530 return nullptr; 531} 532 533ArtMethod* Class::FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 534 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 535 ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 536 if (method != nullptr) { 537 return method; 538 } 539 } 540 return nullptr; 541} 542 543ArtMethod* Class::FindClassInitializer() { 544 for (size_t i = 0; i < NumDirectMethods(); ++i) { 545 ArtMethod* method = GetDirectMethod(i); 546 if (method->IsClassInitializer()) { 547 DCHECK_STREQ(method->GetName(), "<clinit>"); 548 DCHECK_STREQ(method->GetSignature().ToString().c_str(), "()V"); 549 return method; 550 } 551 } 552 return nullptr; 553} 554 555ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) { 556 // Is the field in this class? 557 // Interfaces are not relevant because they can't contain instance fields. 558 for (size_t i = 0; i < NumInstanceFields(); ++i) { 559 ArtField* f = GetInstanceField(i); 560 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 561 return f; 562 } 563 } 564 return nullptr; 565} 566 567ArtField* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 568 if (GetDexCache() == dex_cache) { 569 for (size_t i = 0; i < NumInstanceFields(); ++i) { 570 ArtField* f = GetInstanceField(i); 571 if (f->GetDexFieldIndex() == dex_field_idx) { 572 return f; 573 } 574 } 575 } 576 return nullptr; 577} 578 579ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) { 580 // Is the field in this class, or any of its superclasses? 581 // Interfaces are not relevant because they can't contain instance fields. 582 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 583 ArtField* f = c->FindDeclaredInstanceField(name, type); 584 if (f != nullptr) { 585 return f; 586 } 587 } 588 return nullptr; 589} 590 591ArtField* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 592 // Is the field in this class, or any of its superclasses? 593 // Interfaces are not relevant because they can't contain instance fields. 594 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 595 ArtField* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx); 596 if (f != nullptr) { 597 return f; 598 } 599 } 600 return nullptr; 601} 602 603ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) { 604 DCHECK(type != nullptr); 605 for (size_t i = 0; i < NumStaticFields(); ++i) { 606 ArtField* f = GetStaticField(i); 607 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 608 return f; 609 } 610 } 611 return nullptr; 612} 613 614ArtField* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) { 615 if (dex_cache == GetDexCache()) { 616 for (size_t i = 0; i < NumStaticFields(); ++i) { 617 ArtField* f = GetStaticField(i); 618 if (f->GetDexFieldIndex() == dex_field_idx) { 619 return f; 620 } 621 } 622 } 623 return nullptr; 624} 625 626ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const StringPiece& name, 627 const StringPiece& type) { 628 // Is the field in this class (or its interfaces), or any of its 629 // superclasses (or their interfaces)? 630 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 631 // Is the field in this class? 632 ArtField* f = k->FindDeclaredStaticField(name, type); 633 if (f != nullptr) { 634 return f; 635 } 636 // Wrap k incase it moves during GetDirectInterface. 637 StackHandleScope<1> hs(self); 638 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 639 // Is this field in any of this class' interfaces? 640 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 641 StackHandleScope<1> hs(self); 642 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 643 f = FindStaticField(self, interface, name, type); 644 if (f != nullptr) { 645 return f; 646 } 647 } 648 } 649 return nullptr; 650} 651 652ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const DexCache* dex_cache, 653 uint32_t dex_field_idx) { 654 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 655 // Is the field in this class? 656 ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx); 657 if (f != nullptr) { 658 return f; 659 } 660 // Wrap k incase it moves during GetDirectInterface. 661 StackHandleScope<1> hs(self); 662 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 663 // Is this field in any of this class' interfaces? 664 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 665 StackHandleScope<1> hs(self); 666 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 667 f = FindStaticField(self, interface, dex_cache, dex_field_idx); 668 if (f != nullptr) { 669 return f; 670 } 671 } 672 } 673 return nullptr; 674} 675 676ArtField* Class::FindField(Thread* self, Handle<Class> klass, const StringPiece& name, 677 const StringPiece& type) { 678 // Find a field using the JLS field resolution order 679 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 680 // Is the field in this class? 681 ArtField* f = k->FindDeclaredInstanceField(name, type); 682 if (f != nullptr) { 683 return f; 684 } 685 f = k->FindDeclaredStaticField(name, type); 686 if (f != nullptr) { 687 return f; 688 } 689 // Is this field in any of this class' interfaces? 690 StackHandleScope<1> hs(self); 691 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 692 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 693 StackHandleScope<1> hs(self); 694 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 695 f = interface->FindStaticField(self, interface, name, type); 696 if (f != nullptr) { 697 return f; 698 } 699 } 700 } 701 return nullptr; 702} 703 704static void SetPreverifiedFlagOnMethods(mirror::ObjectArray<mirror::ArtMethod>* methods) 705 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 706 if (methods != nullptr) { 707 for (int32_t index = 0, end = methods->GetLength(); index < end; ++index) { 708 mirror::ArtMethod* method = methods->GetWithoutChecks(index); 709 DCHECK(method != nullptr); 710 if (!method->IsNative() && !method->IsAbstract()) { 711 method->SetPreverified(); 712 } 713 } 714 } 715} 716 717void Class::SetPreverifiedFlagOnAllMethods() { 718 DCHECK(IsVerified()); 719 SetPreverifiedFlagOnMethods(GetDirectMethods()); 720 SetPreverifiedFlagOnMethods(GetVirtualMethods()); 721} 722 723const char* Class::GetDescriptor(std::string* storage) { 724 if (IsPrimitive()) { 725 return Primitive::Descriptor(GetPrimitiveType()); 726 } else if (IsArrayClass()) { 727 return GetArrayDescriptor(storage); 728 } else if (IsProxyClass()) { 729 *storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this); 730 return storage->c_str(); 731 } else { 732 const DexFile& dex_file = GetDexFile(); 733 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_); 734 return dex_file.GetTypeDescriptor(type_id); 735 } 736} 737 738const char* Class::GetArrayDescriptor(std::string* storage) { 739 std::string temp; 740 const char* elem_desc = GetComponentType()->GetDescriptor(&temp); 741 *storage = "["; 742 *storage += elem_desc; 743 return storage->c_str(); 744} 745 746const DexFile::ClassDef* Class::GetClassDef() { 747 uint16_t class_def_idx = GetDexClassDefIndex(); 748 if (class_def_idx == DexFile::kDexNoIndex16) { 749 return nullptr; 750 } 751 return &GetDexFile().GetClassDef(class_def_idx); 752} 753 754uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) { 755 DCHECK(!IsPrimitive()); 756 DCHECK(!IsArrayClass()); 757 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_; 758} 759 760mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass, uint32_t idx) { 761 DCHECK(klass.Get() != nullptr); 762 DCHECK(!klass->IsPrimitive()); 763 if (klass->IsArrayClass()) { 764 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 765 if (idx == 0) { 766 return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;"); 767 } else { 768 DCHECK_EQ(1U, idx); 769 return class_linker->FindSystemClass(self, "Ljava/io/Serializable;"); 770 } 771 } else if (klass->IsProxyClass()) { 772 mirror::ObjectArray<mirror::Class>* interfaces = klass.Get()->GetInterfaces(); 773 DCHECK(interfaces != nullptr); 774 return interfaces->Get(idx); 775 } else { 776 uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx); 777 mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx); 778 if (interface == nullptr) { 779 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx, 780 klass.Get()); 781 CHECK(interface != nullptr || self->IsExceptionPending()); 782 } 783 return interface; 784 } 785} 786 787const char* Class::GetSourceFile() { 788 const DexFile& dex_file = GetDexFile(); 789 const DexFile::ClassDef* dex_class_def = GetClassDef(); 790 if (dex_class_def == nullptr) { 791 // Generated classes have no class def. 792 return nullptr; 793 } 794 return dex_file.GetSourceFile(*dex_class_def); 795} 796 797std::string Class::GetLocation() { 798 mirror::DexCache* dex_cache = GetDexCache(); 799 if (dex_cache != nullptr && !IsProxyClass()) { 800 return dex_cache->GetLocation()->ToModifiedUtf8(); 801 } 802 // Arrays and proxies are generated and have no corresponding dex file location. 803 return "generated class"; 804} 805 806const DexFile::TypeList* Class::GetInterfaceTypeList() { 807 const DexFile::ClassDef* class_def = GetClassDef(); 808 if (class_def == nullptr) { 809 return nullptr; 810 } 811 return GetDexFile().GetInterfacesList(*class_def); 812} 813 814void Class::PopulateEmbeddedImtAndVTable(StackHandleScope<kImtSize>* imt_handle_scope) { 815 for (uint32_t i = 0; i < kImtSize; i++) { 816 // Replace null with conflict. 817 mirror::Object* obj = imt_handle_scope->GetReference(i); 818 DCHECK(obj != nullptr); 819 SetEmbeddedImTableEntry(i, obj->AsArtMethod()); 820 } 821 822 ObjectArray<ArtMethod>* table = GetVTableDuringLinking(); 823 CHECK(table != nullptr) << PrettyClass(this); 824 SetEmbeddedVTableLength(table->GetLength()); 825 for (int32_t i = 0; i < table->GetLength(); i++) { 826 SetEmbeddedVTableEntry(i, table->GetWithoutChecks(i)); 827 } 828 829 // Keep java.lang.Object class's vtable around for since it's easier 830 // to be reused by array classes during their linking. 831 if (!IsObjectClass()) { 832 SetVTable(nullptr); 833 } 834} 835 836// The pre-fence visitor for Class::CopyOf(). 837class CopyClassVisitor { 838 public: 839 explicit CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig, 840 size_t new_length, size_t copy_bytes, 841 StackHandleScope<mirror::Class::kImtSize>* imt_handle_scope) 842 : self_(self), orig_(orig), new_length_(new_length), 843 copy_bytes_(copy_bytes), imt_handle_scope_(imt_handle_scope) { 844 } 845 846 void operator()(Object* obj, size_t usable_size) const 847 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 848 UNUSED(usable_size); 849 mirror::Class* new_class_obj = obj->AsClass(); 850 mirror::Object::CopyObject(self_, new_class_obj, orig_->Get(), copy_bytes_); 851 new_class_obj->SetStatus(Class::kStatusResolving, self_); 852 new_class_obj->PopulateEmbeddedImtAndVTable(imt_handle_scope_); 853 new_class_obj->SetClassSize(new_length_); 854 } 855 856 private: 857 Thread* const self_; 858 Handle<mirror::Class>* const orig_; 859 const size_t new_length_; 860 const size_t copy_bytes_; 861 StackHandleScope<mirror::Class::kImtSize>* const imt_handle_scope_; 862 DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor); 863}; 864 865Class* Class::CopyOf(Thread* self, int32_t new_length, 866 StackHandleScope<kImtSize>* imt_handle_scope) { 867 DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class))); 868 // We may get copied by a compacting GC. 869 StackHandleScope<1> hs(self); 870 Handle<mirror::Class> h_this(hs.NewHandle(this)); 871 gc::Heap* heap = Runtime::Current()->GetHeap(); 872 // The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf() 873 // to skip copying the tail part that we will overwrite here. 874 CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class), imt_handle_scope); 875 mirror::Object* new_class = 876 kMovingClasses 877 ? heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor) 878 : heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor); 879 if (UNLIKELY(new_class == nullptr)) { 880 CHECK(self->IsExceptionPending()); // Expect an OOME. 881 return nullptr; 882 } 883 return new_class->AsClass(); 884} 885 886} // namespace mirror 887} // namespace art 888