class.cc revision 16f149c2cb43a14d8f33d7d0fa36cd784e900f07
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 java_lang_Class_.VisitRootIfNonNull(callback, arg, RootInfo(kRootStickyClass)); 56} 57 58void Class::SetStatus(Handle<Class> h_this, Status new_status, Thread* self) { 59 Status old_status = h_this->GetStatus(); 60 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 61 bool class_linker_initialized = class_linker != nullptr && class_linker->IsInitialized(); 62 if (LIKELY(class_linker_initialized)) { 63 if (UNLIKELY(new_status <= old_status && new_status != kStatusError && 64 new_status != kStatusRetired)) { 65 LOG(FATAL) << "Unexpected change back of class status for " << PrettyClass(h_this.Get()) 66 << " " << old_status << " -> " << new_status; 67 } 68 if (new_status >= kStatusResolved || old_status >= kStatusResolved) { 69 // When classes are being resolved the resolution code should hold the lock. 70 CHECK_EQ(h_this->GetLockOwnerThreadId(), self->GetThreadId()) 71 << "Attempt to change status of class while not holding its lock: " 72 << PrettyClass(h_this.Get()) << " " << old_status << " -> " << new_status; 73 } 74 } 75 if (UNLIKELY(new_status == kStatusError)) { 76 CHECK_NE(h_this->GetStatus(), kStatusError) 77 << "Attempt to set as erroneous an already erroneous class " 78 << PrettyClass(h_this.Get()); 79 80 // Stash current exception. 81 StackHandleScope<1> hs(self); 82 Handle<mirror::Throwable> old_exception(hs.NewHandle(self->GetException())); 83 CHECK(old_exception.Get() != nullptr); 84 Class* eiie_class; 85 // Do't attempt to use FindClass if we have an OOM error since this can try to do more 86 // allocations and may cause infinite loops. 87 bool throw_eiie = (old_exception.Get() == nullptr); 88 if (!throw_eiie) { 89 std::string temp; 90 const char* old_exception_descriptor = old_exception->GetClass()->GetDescriptor(&temp); 91 throw_eiie = (strcmp(old_exception_descriptor, "Ljava/lang/OutOfMemoryError;") != 0); 92 } 93 if (throw_eiie) { 94 // Clear exception to call FindSystemClass. 95 self->ClearException(); 96 eiie_class = Runtime::Current()->GetClassLinker()->FindSystemClass( 97 self, "Ljava/lang/ExceptionInInitializerError;"); 98 CHECK(!self->IsExceptionPending()); 99 // Only verification errors, not initialization problems, should set a verify error. 100 // This is to ensure that ThrowEarlierClassFailure will throw NoClassDefFoundError in that 101 // case. 102 Class* exception_class = old_exception->GetClass(); 103 if (!eiie_class->IsAssignableFrom(exception_class)) { 104 h_this->SetVerifyErrorClass(exception_class); 105 } 106 } 107 108 // Restore exception. 109 self->SetException(old_exception.Get()); 110 } 111 static_assert(sizeof(Status) == sizeof(uint32_t), "Size of status not equal to uint32"); 112 if (Runtime::Current()->IsActiveTransaction()) { 113 h_this->SetField32Volatile<true>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 114 } else { 115 h_this->SetField32Volatile<false>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 116 } 117 118 if (!class_linker_initialized) { 119 // When the class linker is being initialized its single threaded and by definition there can be 120 // no waiters. During initialization classes may appear temporary but won't be retired as their 121 // size was statically computed. 122 } else { 123 // Classes that are being resolved or initialized need to notify waiters that the class status 124 // changed. See ClassLinker::EnsureResolved and ClassLinker::WaitForInitializeClass. 125 if (h_this->IsTemp()) { 126 // Class is a temporary one, ensure that waiters for resolution get notified of retirement 127 // so that they can grab the new version of the class from the class linker's table. 128 CHECK_LT(new_status, kStatusResolved) << PrettyDescriptor(h_this.Get()); 129 if (new_status == kStatusRetired || new_status == kStatusError) { 130 h_this->NotifyAll(self); 131 } 132 } else { 133 CHECK_NE(new_status, kStatusRetired); 134 if (old_status >= kStatusResolved || new_status >= kStatusResolved) { 135 h_this->NotifyAll(self); 136 } 137 } 138 } 139} 140 141void Class::SetDexCache(DexCache* new_dex_cache) { 142 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache); 143 SetDexCacheStrings(new_dex_cache != nullptr ? new_dex_cache->GetStrings() : nullptr); 144} 145 146void Class::SetClassSize(uint32_t new_class_size) { 147 if (kIsDebugBuild && (new_class_size < GetClassSize())) { 148 DumpClass(LOG(ERROR), kDumpClassFullDetail); 149 CHECK_GE(new_class_size, GetClassSize()) << " class=" << PrettyTypeOf(this); 150 } 151 // Not called within a transaction. 152 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size); 153} 154 155// Return the class' name. The exact format is bizarre, but it's the specified behavior for 156// Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int" 157// but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than 158// slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness. 159String* Class::ComputeName(Handle<Class> h_this) { 160 String* name = h_this->GetName(); 161 if (name != nullptr) { 162 return name; 163 } 164 std::string temp; 165 const char* descriptor = h_this->GetDescriptor(&temp); 166 Thread* self = Thread::Current(); 167 if ((descriptor[0] != 'L') && (descriptor[0] != '[')) { 168 // The descriptor indicates that this is the class for 169 // a primitive type; special-case the return value. 170 const char* c_name = nullptr; 171 switch (descriptor[0]) { 172 case 'Z': c_name = "boolean"; break; 173 case 'B': c_name = "byte"; break; 174 case 'C': c_name = "char"; break; 175 case 'S': c_name = "short"; break; 176 case 'I': c_name = "int"; break; 177 case 'J': c_name = "long"; break; 178 case 'F': c_name = "float"; break; 179 case 'D': c_name = "double"; break; 180 case 'V': c_name = "void"; break; 181 default: 182 LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]); 183 } 184 name = String::AllocFromModifiedUtf8(self, c_name); 185 } else { 186 // Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package 187 // components. 188 name = String::AllocFromModifiedUtf8(self, DescriptorToDot(descriptor).c_str()); 189 } 190 h_this->SetName(name); 191 return name; 192} 193 194void Class::DumpClass(std::ostream& os, int flags) { 195 if ((flags & kDumpClassFullDetail) == 0) { 196 os << PrettyClass(this); 197 if ((flags & kDumpClassClassLoader) != 0) { 198 os << ' ' << GetClassLoader(); 199 } 200 if ((flags & kDumpClassInitialized) != 0) { 201 os << ' ' << GetStatus(); 202 } 203 os << "\n"; 204 return; 205 } 206 207 Thread* self = Thread::Current(); 208 StackHandleScope<2> hs(self); 209 Handle<mirror::Class> h_this(hs.NewHandle(this)); 210 Handle<mirror::Class> h_super(hs.NewHandle(GetSuperClass())); 211 212 std::string temp; 213 os << "----- " << (IsInterface() ? "interface" : "class") << " " 214 << "'" << GetDescriptor(&temp) << "' cl=" << GetClassLoader() << " -----\n", 215 os << " objectSize=" << SizeOf() << " " 216 << "(" << (h_super.Get() != nullptr ? h_super->SizeOf() : -1) << " from super)\n", 217 os << StringPrintf(" access=0x%04x.%04x\n", 218 GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask); 219 if (h_super.Get() != nullptr) { 220 os << " super='" << PrettyClass(h_super.Get()) << "' (cl=" << h_super->GetClassLoader() 221 << ")\n"; 222 } 223 if (IsArrayClass()) { 224 os << " componentType=" << PrettyClass(GetComponentType()) << "\n"; 225 } 226 const size_t num_direct_interfaces = NumDirectInterfaces(); 227 if (num_direct_interfaces > 0) { 228 os << " interfaces (" << num_direct_interfaces << "):\n"; 229 for (size_t i = 0; i < num_direct_interfaces; ++i) { 230 Class* interface = GetDirectInterface(self, h_this, i); 231 if (interface == nullptr) { 232 os << StringPrintf(" %2zd: nullptr!\n", i); 233 } else { 234 const ClassLoader* cl = interface->GetClassLoader(); 235 os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl); 236 } 237 } 238 } 239 if (!IsLoaded()) { 240 os << " class not yet loaded"; 241 } else { 242 // After this point, this may have moved due to GetDirectInterface. 243 os << " vtable (" << h_this->NumVirtualMethods() << " entries, " 244 << (h_super.Get() != nullptr ? h_super->NumVirtualMethods() : 0) << " in super):\n"; 245 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 246 os << StringPrintf(" %2zd: %s\n", i, 247 PrettyMethod(h_this->GetVirtualMethodDuringLinking(i)).c_str()); 248 } 249 os << " direct methods (" << h_this->NumDirectMethods() << " entries):\n"; 250 for (size_t i = 0; i < h_this->NumDirectMethods(); ++i) { 251 os << StringPrintf(" %2zd: %s\n", i, PrettyMethod(h_this->GetDirectMethod(i)).c_str()); 252 } 253 if (h_this->NumStaticFields() > 0) { 254 os << " static fields (" << h_this->NumStaticFields() << " entries):\n"; 255 if (h_this->IsResolved() || h_this->IsErroneous()) { 256 for (size_t i = 0; i < h_this->NumStaticFields(); ++i) { 257 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetStaticField(i)).c_str()); 258 } 259 } else { 260 os << " <not yet available>"; 261 } 262 } 263 if (h_this->NumInstanceFields() > 0) { 264 os << " instance fields (" << h_this->NumInstanceFields() << " entries):\n"; 265 if (h_this->IsResolved() || h_this->IsErroneous()) { 266 for (size_t i = 0; i < h_this->NumInstanceFields(); ++i) { 267 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetInstanceField(i)).c_str()); 268 } 269 } else { 270 os << " <not yet available>"; 271 } 272 } 273 } 274} 275 276void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) { 277 if (kIsDebugBuild && (new_reference_offsets != kClassWalkSuper)) { 278 // Sanity check that the number of bits set in the reference offset bitmap 279 // agrees with the number of references 280 uint32_t count = 0; 281 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 282 count += c->NumReferenceInstanceFieldsDuringLinking(); 283 } 284 // +1 for the Class in Object. 285 CHECK_EQ(static_cast<uint32_t>(POPCOUNT(new_reference_offsets)) + 1, count); 286 } 287 // Not called within a transaction. 288 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_), 289 new_reference_offsets); 290} 291 292bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) { 293 size_t i = 0; 294 size_t min_length = std::min(descriptor1.size(), descriptor2.size()); 295 while (i < min_length && descriptor1[i] == descriptor2[i]) { 296 ++i; 297 } 298 if (descriptor1.find('/', i) != StringPiece::npos || 299 descriptor2.find('/', i) != StringPiece::npos) { 300 return false; 301 } else { 302 return true; 303 } 304} 305 306bool Class::IsInSamePackage(Class* that) { 307 Class* klass1 = this; 308 Class* klass2 = that; 309 if (klass1 == klass2) { 310 return true; 311 } 312 // Class loaders must match. 313 if (klass1->GetClassLoader() != klass2->GetClassLoader()) { 314 return false; 315 } 316 // Arrays are in the same package when their element classes are. 317 while (klass1->IsArrayClass()) { 318 klass1 = klass1->GetComponentType(); 319 } 320 while (klass2->IsArrayClass()) { 321 klass2 = klass2->GetComponentType(); 322 } 323 // trivial check again for array types 324 if (klass1 == klass2) { 325 return true; 326 } 327 // Compare the package part of the descriptor string. 328 std::string temp1, temp2; 329 return IsInSamePackage(klass1->GetDescriptor(&temp1), klass2->GetDescriptor(&temp2)); 330} 331 332bool Class::IsStringClass() const { 333 return this == String::GetJavaLangString(); 334} 335 336bool Class::IsThrowableClass() { 337 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this); 338} 339 340void Class::SetClassLoader(ClassLoader* new_class_loader) { 341 if (Runtime::Current()->IsActiveTransaction()) { 342 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 343 } else { 344 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 345 } 346} 347 348ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature) { 349 // Check the current class before checking the interfaces. 350 ArtMethod* method = FindDeclaredVirtualMethod(name, signature); 351 if (method != nullptr) { 352 return method; 353 } 354 355 int32_t iftable_count = GetIfTableCount(); 356 IfTable* iftable = GetIfTable(); 357 for (int32_t i = 0; i < iftable_count; ++i) { 358 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature); 359 if (method != nullptr) { 360 return method; 361 } 362 } 363 return nullptr; 364} 365 366ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature) { 367 // Check the current class before checking the interfaces. 368 ArtMethod* method = FindDeclaredVirtualMethod(name, signature); 369 if (method != nullptr) { 370 return method; 371 } 372 373 int32_t iftable_count = GetIfTableCount(); 374 IfTable* iftable = GetIfTable(); 375 for (int32_t i = 0; i < iftable_count; ++i) { 376 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature); 377 if (method != nullptr) { 378 return method; 379 } 380 } 381 return nullptr; 382} 383 384ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 385 // Check the current class before checking the interfaces. 386 ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 387 if (method != nullptr) { 388 return method; 389 } 390 391 int32_t iftable_count = GetIfTableCount(); 392 IfTable* iftable = GetIfTable(); 393 for (int32_t i = 0; i < iftable_count; ++i) { 394 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 395 if (method != nullptr) { 396 return method; 397 } 398 } 399 return nullptr; 400} 401 402ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature) { 403 for (size_t i = 0; i < NumDirectMethods(); ++i) { 404 ArtMethod* method = GetDirectMethod(i); 405 if (name == method->GetName() && method->GetSignature() == signature) { 406 return method; 407 } 408 } 409 return nullptr; 410} 411 412ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature) { 413 for (size_t i = 0; i < NumDirectMethods(); ++i) { 414 ArtMethod* method = GetDirectMethod(i); 415 if (name == method->GetName() && signature == method->GetSignature()) { 416 return method; 417 } 418 } 419 return nullptr; 420} 421 422ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 423 if (GetDexCache() == dex_cache) { 424 for (size_t i = 0; i < NumDirectMethods(); ++i) { 425 ArtMethod* method = GetDirectMethod(i); 426 if (method->GetDexMethodIndex() == dex_method_idx) { 427 return method; 428 } 429 } 430 } 431 return nullptr; 432} 433 434ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature) { 435 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 436 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature); 437 if (method != nullptr) { 438 return method; 439 } 440 } 441 return nullptr; 442} 443 444ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature) { 445 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 446 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature); 447 if (method != nullptr) { 448 return method; 449 } 450 } 451 return nullptr; 452} 453 454ArtMethod* Class::FindDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 455 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 456 ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx); 457 if (method != nullptr) { 458 return method; 459 } 460 } 461 return nullptr; 462} 463 464ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature) { 465 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 466 ArtMethod* method = GetVirtualMethod(i); 467 if (name == method->GetName() && method->GetSignature() == signature) { 468 return method; 469 } 470 } 471 return nullptr; 472} 473 474ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature) { 475 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 476 ArtMethod* method = GetVirtualMethod(i); 477 if (name == method->GetName() && signature == method->GetSignature()) { 478 return method; 479 } 480 } 481 return nullptr; 482} 483 484ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 485 if (GetDexCache() == dex_cache) { 486 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 487 ArtMethod* method = GetVirtualMethod(i); 488 if (method->GetDexMethodIndex() == dex_method_idx && 489 // A miranda method may have a different DexCache and is always created by linking, 490 // never *declared* in the class. 491 !method->IsMiranda()) { 492 return method; 493 } 494 } 495 } 496 return nullptr; 497} 498 499ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const StringPiece& signature) { 500 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 501 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 502 if (method != nullptr) { 503 return method; 504 } 505 } 506 return nullptr; 507} 508 509ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const Signature& signature) { 510 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 511 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 512 if (method != nullptr) { 513 return method; 514 } 515 } 516 return nullptr; 517} 518 519ArtMethod* Class::FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 520 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 521 ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 522 if (method != nullptr) { 523 return method; 524 } 525 } 526 return nullptr; 527} 528 529ArtMethod* Class::FindClassInitializer() { 530 for (size_t i = 0; i < NumDirectMethods(); ++i) { 531 ArtMethod* method = GetDirectMethod(i); 532 if (method->IsClassInitializer()) { 533 DCHECK_STREQ(method->GetName(), "<clinit>"); 534 DCHECK_STREQ(method->GetSignature().ToString().c_str(), "()V"); 535 return method; 536 } 537 } 538 return nullptr; 539} 540 541ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) { 542 // Is the field in this class? 543 // Interfaces are not relevant because they can't contain instance fields. 544 for (size_t i = 0; i < NumInstanceFields(); ++i) { 545 ArtField* f = GetInstanceField(i); 546 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 547 return f; 548 } 549 } 550 return nullptr; 551} 552 553ArtField* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 554 if (GetDexCache() == dex_cache) { 555 for (size_t i = 0; i < NumInstanceFields(); ++i) { 556 ArtField* f = GetInstanceField(i); 557 if (f->GetDexFieldIndex() == dex_field_idx) { 558 return f; 559 } 560 } 561 } 562 return nullptr; 563} 564 565ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) { 566 // Is the field in this class, or any of its superclasses? 567 // Interfaces are not relevant because they can't contain instance fields. 568 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 569 ArtField* f = c->FindDeclaredInstanceField(name, type); 570 if (f != nullptr) { 571 return f; 572 } 573 } 574 return nullptr; 575} 576 577ArtField* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 578 // Is the field in this class, or any of its superclasses? 579 // Interfaces are not relevant because they can't contain instance fields. 580 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 581 ArtField* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx); 582 if (f != nullptr) { 583 return f; 584 } 585 } 586 return nullptr; 587} 588 589ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) { 590 DCHECK(type != nullptr); 591 for (size_t i = 0; i < NumStaticFields(); ++i) { 592 ArtField* f = GetStaticField(i); 593 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 594 return f; 595 } 596 } 597 return nullptr; 598} 599 600ArtField* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) { 601 if (dex_cache == GetDexCache()) { 602 for (size_t i = 0; i < NumStaticFields(); ++i) { 603 ArtField* f = GetStaticField(i); 604 if (f->GetDexFieldIndex() == dex_field_idx) { 605 return f; 606 } 607 } 608 } 609 return nullptr; 610} 611 612ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const StringPiece& name, 613 const StringPiece& type) { 614 // Is the field in this class (or its interfaces), or any of its 615 // superclasses (or their interfaces)? 616 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 617 // Is the field in this class? 618 ArtField* f = k->FindDeclaredStaticField(name, type); 619 if (f != nullptr) { 620 return f; 621 } 622 // Wrap k incase it moves during GetDirectInterface. 623 StackHandleScope<1> hs(self); 624 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 625 // Is this field in any of this class' interfaces? 626 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 627 StackHandleScope<1> hs2(self); 628 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 629 f = FindStaticField(self, interface, name, type); 630 if (f != nullptr) { 631 return f; 632 } 633 } 634 } 635 return nullptr; 636} 637 638ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const DexCache* dex_cache, 639 uint32_t dex_field_idx) { 640 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 641 // Is the field in this class? 642 ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx); 643 if (f != nullptr) { 644 return f; 645 } 646 // Wrap k incase it moves during GetDirectInterface. 647 StackHandleScope<1> hs(self); 648 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 649 // Is this field in any of this class' interfaces? 650 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 651 StackHandleScope<1> hs2(self); 652 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 653 f = FindStaticField(self, interface, dex_cache, dex_field_idx); 654 if (f != nullptr) { 655 return f; 656 } 657 } 658 } 659 return nullptr; 660} 661 662ArtField* Class::FindField(Thread* self, Handle<Class> klass, const StringPiece& name, 663 const StringPiece& type) { 664 // Find a field using the JLS field resolution order 665 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 666 // Is the field in this class? 667 ArtField* f = k->FindDeclaredInstanceField(name, type); 668 if (f != nullptr) { 669 return f; 670 } 671 f = k->FindDeclaredStaticField(name, type); 672 if (f != nullptr) { 673 return f; 674 } 675 // Is this field in any of this class' interfaces? 676 StackHandleScope<1> hs(self); 677 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 678 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 679 StackHandleScope<1> hs2(self); 680 Handle<mirror::Class> interface(hs2.NewHandle(GetDirectInterface(self, h_k, i))); 681 f = interface->FindStaticField(self, interface, name, type); 682 if (f != nullptr) { 683 return f; 684 } 685 } 686 } 687 return nullptr; 688} 689 690static void SetPreverifiedFlagOnMethods(mirror::ObjectArray<mirror::ArtMethod>* methods) 691 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 692 if (methods != nullptr) { 693 for (int32_t index = 0, end = methods->GetLength(); index < end; ++index) { 694 mirror::ArtMethod* method = methods->GetWithoutChecks(index); 695 DCHECK(method != nullptr); 696 if (!method->IsNative() && !method->IsAbstract()) { 697 method->SetPreverified(); 698 } 699 } 700 } 701} 702 703void Class::SetPreverifiedFlagOnAllMethods() { 704 DCHECK(IsVerified()); 705 SetPreverifiedFlagOnMethods(GetDirectMethods()); 706 SetPreverifiedFlagOnMethods(GetVirtualMethods()); 707} 708 709const char* Class::GetDescriptor(std::string* storage) { 710 if (IsPrimitive()) { 711 return Primitive::Descriptor(GetPrimitiveType()); 712 } else if (IsArrayClass()) { 713 return GetArrayDescriptor(storage); 714 } else if (IsProxyClass()) { 715 *storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this); 716 return storage->c_str(); 717 } else { 718 const DexFile& dex_file = GetDexFile(); 719 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_); 720 return dex_file.GetTypeDescriptor(type_id); 721 } 722} 723 724const char* Class::GetArrayDescriptor(std::string* storage) { 725 std::string temp; 726 const char* elem_desc = GetComponentType()->GetDescriptor(&temp); 727 *storage = "["; 728 *storage += elem_desc; 729 return storage->c_str(); 730} 731 732const DexFile::ClassDef* Class::GetClassDef() { 733 uint16_t class_def_idx = GetDexClassDefIndex(); 734 if (class_def_idx == DexFile::kDexNoIndex16) { 735 return nullptr; 736 } 737 return &GetDexFile().GetClassDef(class_def_idx); 738} 739 740uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) { 741 DCHECK(!IsPrimitive()); 742 DCHECK(!IsArrayClass()); 743 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_; 744} 745 746mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass, 747 uint32_t idx) { 748 DCHECK(klass.Get() != nullptr); 749 DCHECK(!klass->IsPrimitive()); 750 if (klass->IsArrayClass()) { 751 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 752 if (idx == 0) { 753 return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;"); 754 } else { 755 DCHECK_EQ(1U, idx); 756 return class_linker->FindSystemClass(self, "Ljava/io/Serializable;"); 757 } 758 } else if (klass->IsProxyClass()) { 759 mirror::ObjectArray<mirror::Class>* interfaces = klass.Get()->GetInterfaces(); 760 DCHECK(interfaces != nullptr); 761 return interfaces->Get(idx); 762 } else { 763 uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx); 764 mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx); 765 if (interface == nullptr) { 766 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx, 767 klass.Get()); 768 CHECK(interface != nullptr || self->IsExceptionPending()); 769 } 770 return interface; 771 } 772} 773 774const char* Class::GetSourceFile() { 775 const DexFile& dex_file = GetDexFile(); 776 const DexFile::ClassDef* dex_class_def = GetClassDef(); 777 if (dex_class_def == nullptr) { 778 // Generated classes have no class def. 779 return nullptr; 780 } 781 return dex_file.GetSourceFile(*dex_class_def); 782} 783 784std::string Class::GetLocation() { 785 mirror::DexCache* dex_cache = GetDexCache(); 786 if (dex_cache != nullptr && !IsProxyClass()) { 787 return dex_cache->GetLocation()->ToModifiedUtf8(); 788 } 789 // Arrays and proxies are generated and have no corresponding dex file location. 790 return "generated class"; 791} 792 793const DexFile::TypeList* Class::GetInterfaceTypeList() { 794 const DexFile::ClassDef* class_def = GetClassDef(); 795 if (class_def == nullptr) { 796 return nullptr; 797 } 798 return GetDexFile().GetInterfacesList(*class_def); 799} 800 801void Class::PopulateEmbeddedImtAndVTable(StackHandleScope<kImtSize>* imt_handle_scope) { 802 for (uint32_t i = 0; i < kImtSize; i++) { 803 // Replace null with conflict. 804 mirror::Object* obj = imt_handle_scope->GetReference(i); 805 DCHECK(obj != nullptr); 806 SetEmbeddedImTableEntry(i, obj->AsArtMethod()); 807 } 808 809 ObjectArray<ArtMethod>* table = GetVTableDuringLinking(); 810 CHECK(table != nullptr) << PrettyClass(this); 811 SetEmbeddedVTableLength(table->GetLength()); 812 for (int32_t i = 0; i < table->GetLength(); i++) { 813 SetEmbeddedVTableEntry(i, table->GetWithoutChecks(i)); 814 } 815 816 // Keep java.lang.Object class's vtable around for since it's easier 817 // to be reused by array classes during their linking. 818 if (!IsObjectClass()) { 819 SetVTable(nullptr); 820 } 821} 822 823// The pre-fence visitor for Class::CopyOf(). 824class CopyClassVisitor { 825 public: 826 explicit CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig, 827 size_t new_length, size_t copy_bytes, 828 StackHandleScope<mirror::Class::kImtSize>* imt_handle_scope) 829 : self_(self), orig_(orig), new_length_(new_length), 830 copy_bytes_(copy_bytes), imt_handle_scope_(imt_handle_scope) { 831 } 832 833 void operator()(Object* obj, size_t usable_size) const 834 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 835 UNUSED(usable_size); 836 StackHandleScope<1> hs(self_); 837 Handle<mirror::Class> h_new_class_obj(hs.NewHandle(obj->AsClass())); 838 mirror::Object::CopyObject(self_, h_new_class_obj.Get(), orig_->Get(), copy_bytes_); 839 mirror::Class::SetStatus(h_new_class_obj, Class::kStatusResolving, self_); 840 h_new_class_obj->PopulateEmbeddedImtAndVTable(imt_handle_scope_); 841 h_new_class_obj->SetClassSize(new_length_); 842 } 843 844 private: 845 Thread* const self_; 846 Handle<mirror::Class>* const orig_; 847 const size_t new_length_; 848 const size_t copy_bytes_; 849 StackHandleScope<mirror::Class::kImtSize>* const imt_handle_scope_; 850 DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor); 851}; 852 853Class* Class::CopyOf(Thread* self, int32_t new_length, 854 StackHandleScope<kImtSize>* imt_handle_scope) { 855 DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class))); 856 // We may get copied by a compacting GC. 857 StackHandleScope<1> hs(self); 858 Handle<mirror::Class> h_this(hs.NewHandle(this)); 859 gc::Heap* heap = Runtime::Current()->GetHeap(); 860 // The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf() 861 // to skip copying the tail part that we will overwrite here. 862 CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class), imt_handle_scope); 863 mirror::Object* new_class = 864 kMovingClasses 865 ? heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor) 866 : heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor); 867 if (UNLIKELY(new_class == nullptr)) { 868 CHECK(self->IsExceptionPending()); // Expect an OOME. 869 return nullptr; 870 } 871 return new_class->AsClass(); 872} 873 874} // namespace mirror 875} // namespace art 876