class.cc revision faff0f05fef90577c9744505555675185832aacd
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 295bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) { 296 size_t i = 0; 297 while (descriptor1[i] != '\0' && descriptor1[i] == descriptor2[i]) { 298 ++i; 299 } 300 if (descriptor1.find('/', i) != StringPiece::npos || 301 descriptor2.find('/', i) != StringPiece::npos) { 302 return false; 303 } else { 304 return true; 305 } 306} 307 308bool Class::IsInSamePackage(Class* that) { 309 Class* klass1 = this; 310 Class* klass2 = that; 311 if (klass1 == klass2) { 312 return true; 313 } 314 // Class loaders must match. 315 if (klass1->GetClassLoader() != klass2->GetClassLoader()) { 316 return false; 317 } 318 // Arrays are in the same package when their element classes are. 319 while (klass1->IsArrayClass()) { 320 klass1 = klass1->GetComponentType(); 321 } 322 while (klass2->IsArrayClass()) { 323 klass2 = klass2->GetComponentType(); 324 } 325 // trivial check again for array types 326 if (klass1 == klass2) { 327 return true; 328 } 329 // Compare the package part of the descriptor string. 330 std::string temp1, temp2; 331 return IsInSamePackage(klass1->GetDescriptor(&temp1), klass2->GetDescriptor(&temp2)); 332} 333 334bool Class::IsStringClass() const { 335 return this == String::GetJavaLangString(); 336} 337 338bool Class::IsThrowableClass() { 339 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this); 340} 341 342void Class::SetClassLoader(ClassLoader* new_class_loader) { 343 if (Runtime::Current()->IsActiveTransaction()) { 344 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 345 } else { 346 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 347 } 348} 349 350ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature) { 351 // Check the current class before checking the interfaces. 352 ArtMethod* method = FindDeclaredVirtualMethod(name, signature); 353 if (method != nullptr) { 354 return method; 355 } 356 357 int32_t iftable_count = GetIfTableCount(); 358 IfTable* iftable = GetIfTable(); 359 for (int32_t i = 0; i < iftable_count; ++i) { 360 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature); 361 if (method != nullptr) { 362 return method; 363 } 364 } 365 return nullptr; 366} 367 368ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature) { 369 // Check the current class before checking the interfaces. 370 ArtMethod* method = FindDeclaredVirtualMethod(name, signature); 371 if (method != nullptr) { 372 return method; 373 } 374 375 int32_t iftable_count = GetIfTableCount(); 376 IfTable* iftable = GetIfTable(); 377 for (int32_t i = 0; i < iftable_count; ++i) { 378 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature); 379 if (method != nullptr) { 380 return method; 381 } 382 } 383 return nullptr; 384} 385 386ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 387 // Check the current class before checking the interfaces. 388 ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 389 if (method != nullptr) { 390 return method; 391 } 392 393 int32_t iftable_count = GetIfTableCount(); 394 IfTable* iftable = GetIfTable(); 395 for (int32_t i = 0; i < iftable_count; ++i) { 396 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 397 if (method != nullptr) { 398 return method; 399 } 400 } 401 return nullptr; 402} 403 404ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature) { 405 for (size_t i = 0; i < NumDirectMethods(); ++i) { 406 ArtMethod* method = GetDirectMethod(i); 407 if (name == method->GetName() && method->GetSignature() == signature) { 408 return method; 409 } 410 } 411 return nullptr; 412} 413 414ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature) { 415 for (size_t i = 0; i < NumDirectMethods(); ++i) { 416 ArtMethod* method = GetDirectMethod(i); 417 if (name == method->GetName() && signature == method->GetSignature()) { 418 return method; 419 } 420 } 421 return nullptr; 422} 423 424ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 425 if (GetDexCache() == dex_cache) { 426 for (size_t i = 0; i < NumDirectMethods(); ++i) { 427 ArtMethod* method = GetDirectMethod(i); 428 if (method->GetDexMethodIndex() == dex_method_idx) { 429 return method; 430 } 431 } 432 } 433 return nullptr; 434} 435 436ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature) { 437 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 438 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature); 439 if (method != nullptr) { 440 return method; 441 } 442 } 443 return nullptr; 444} 445 446ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature) { 447 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 448 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature); 449 if (method != nullptr) { 450 return method; 451 } 452 } 453 return nullptr; 454} 455 456ArtMethod* Class::FindDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 457 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 458 ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx); 459 if (method != nullptr) { 460 return method; 461 } 462 } 463 return nullptr; 464} 465 466ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature) { 467 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 468 ArtMethod* method = GetVirtualMethod(i); 469 if (name == method->GetName() && method->GetSignature() == signature) { 470 return method; 471 } 472 } 473 return nullptr; 474} 475 476ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature) { 477 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 478 ArtMethod* method = GetVirtualMethod(i); 479 if (name == method->GetName() && signature == method->GetSignature()) { 480 return method; 481 } 482 } 483 return nullptr; 484} 485 486ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 487 if (GetDexCache() == dex_cache) { 488 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 489 ArtMethod* method = GetVirtualMethod(i); 490 if (method->GetDexMethodIndex() == dex_method_idx) { 491 return method; 492 } 493 } 494 } 495 return nullptr; 496} 497 498ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const StringPiece& signature) { 499 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 500 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 501 if (method != nullptr) { 502 return method; 503 } 504 } 505 return nullptr; 506} 507 508ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const Signature& signature) { 509 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 510 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 511 if (method != nullptr) { 512 return method; 513 } 514 } 515 return nullptr; 516} 517 518ArtMethod* Class::FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 519 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 520 ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 521 if (method != nullptr) { 522 return method; 523 } 524 } 525 return nullptr; 526} 527 528ArtMethod* Class::FindClassInitializer() { 529 for (size_t i = 0; i < NumDirectMethods(); ++i) { 530 ArtMethod* method = GetDirectMethod(i); 531 if (method->IsClassInitializer()) { 532 DCHECK_STREQ(method->GetName(), "<clinit>"); 533 DCHECK_STREQ(method->GetSignature().ToString().c_str(), "()V"); 534 return method; 535 } 536 } 537 return nullptr; 538} 539 540ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) { 541 // Is the field in this class? 542 // Interfaces are not relevant because they can't contain instance fields. 543 for (size_t i = 0; i < NumInstanceFields(); ++i) { 544 ArtField* f = GetInstanceField(i); 545 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 546 return f; 547 } 548 } 549 return nullptr; 550} 551 552ArtField* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 553 if (GetDexCache() == dex_cache) { 554 for (size_t i = 0; i < NumInstanceFields(); ++i) { 555 ArtField* f = GetInstanceField(i); 556 if (f->GetDexFieldIndex() == dex_field_idx) { 557 return f; 558 } 559 } 560 } 561 return nullptr; 562} 563 564ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) { 565 // Is the field in this class, or any of its superclasses? 566 // Interfaces are not relevant because they can't contain instance fields. 567 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 568 ArtField* f = c->FindDeclaredInstanceField(name, type); 569 if (f != nullptr) { 570 return f; 571 } 572 } 573 return nullptr; 574} 575 576ArtField* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 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(dex_cache, dex_field_idx); 581 if (f != nullptr) { 582 return f; 583 } 584 } 585 return nullptr; 586} 587 588ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) { 589 DCHECK(type != nullptr); 590 for (size_t i = 0; i < NumStaticFields(); ++i) { 591 ArtField* f = GetStaticField(i); 592 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 593 return f; 594 } 595 } 596 return nullptr; 597} 598 599ArtField* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) { 600 if (dex_cache == GetDexCache()) { 601 for (size_t i = 0; i < NumStaticFields(); ++i) { 602 ArtField* f = GetStaticField(i); 603 if (f->GetDexFieldIndex() == dex_field_idx) { 604 return f; 605 } 606 } 607 } 608 return nullptr; 609} 610 611ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const StringPiece& name, 612 const StringPiece& type) { 613 // Is the field in this class (or its interfaces), or any of its 614 // superclasses (or their interfaces)? 615 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 616 // Is the field in this class? 617 ArtField* f = k->FindDeclaredStaticField(name, type); 618 if (f != nullptr) { 619 return f; 620 } 621 // Wrap k incase it moves during GetDirectInterface. 622 StackHandleScope<1> hs(self); 623 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 624 // Is this field in any of this class' interfaces? 625 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 626 StackHandleScope<1> hs(self); 627 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 628 f = FindStaticField(self, interface, name, type); 629 if (f != nullptr) { 630 return f; 631 } 632 } 633 } 634 return nullptr; 635} 636 637ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const DexCache* dex_cache, 638 uint32_t dex_field_idx) { 639 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 640 // Is the field in this class? 641 ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx); 642 if (f != nullptr) { 643 return f; 644 } 645 // Wrap k incase it moves during GetDirectInterface. 646 StackHandleScope<1> hs(self); 647 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 648 // Is this field in any of this class' interfaces? 649 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 650 StackHandleScope<1> hs(self); 651 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 652 f = FindStaticField(self, interface, dex_cache, dex_field_idx); 653 if (f != nullptr) { 654 return f; 655 } 656 } 657 } 658 return nullptr; 659} 660 661ArtField* Class::FindField(Thread* self, Handle<Class> klass, const StringPiece& name, 662 const StringPiece& type) { 663 // Find a field using the JLS field resolution order 664 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 665 // Is the field in this class? 666 ArtField* f = k->FindDeclaredInstanceField(name, type); 667 if (f != nullptr) { 668 return f; 669 } 670 f = k->FindDeclaredStaticField(name, type); 671 if (f != nullptr) { 672 return f; 673 } 674 // Is this field in any of this class' interfaces? 675 StackHandleScope<1> hs(self); 676 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 677 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 678 StackHandleScope<1> hs(self); 679 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 680 f = interface->FindStaticField(self, interface, name, type); 681 if (f != nullptr) { 682 return f; 683 } 684 } 685 } 686 return nullptr; 687} 688 689static void SetPreverifiedFlagOnMethods(mirror::ObjectArray<mirror::ArtMethod>* methods) 690 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 691 if (methods != nullptr) { 692 for (int32_t index = 0, end = methods->GetLength(); index < end; ++index) { 693 mirror::ArtMethod* method = methods->GetWithoutChecks(index); 694 DCHECK(method != nullptr); 695 if (!method->IsNative() && !method->IsAbstract()) { 696 method->SetPreverified(); 697 } 698 } 699 } 700} 701 702void Class::SetPreverifiedFlagOnAllMethods() { 703 DCHECK(IsVerified()); 704 SetPreverifiedFlagOnMethods(GetDirectMethods()); 705 SetPreverifiedFlagOnMethods(GetVirtualMethods()); 706} 707 708const char* Class::GetDescriptor(std::string* storage) { 709 if (IsPrimitive()) { 710 return Primitive::Descriptor(GetPrimitiveType()); 711 } else if (IsArrayClass()) { 712 return GetArrayDescriptor(storage); 713 } else if (IsProxyClass()) { 714 *storage = Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this); 715 return storage->c_str(); 716 } else { 717 const DexFile& dex_file = GetDexFile(); 718 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_); 719 return dex_file.GetTypeDescriptor(type_id); 720 } 721} 722 723const char* Class::GetArrayDescriptor(std::string* storage) { 724 std::string temp; 725 const char* elem_desc = GetComponentType()->GetDescriptor(&temp); 726 *storage = "["; 727 *storage += elem_desc; 728 return storage->c_str(); 729} 730 731const DexFile::ClassDef* Class::GetClassDef() { 732 uint16_t class_def_idx = GetDexClassDefIndex(); 733 if (class_def_idx == DexFile::kDexNoIndex16) { 734 return nullptr; 735 } 736 return &GetDexFile().GetClassDef(class_def_idx); 737} 738 739uint32_t Class::NumDirectInterfaces() { 740 if (IsPrimitive()) { 741 return 0; 742 } else if (IsArrayClass()) { 743 return 2; 744 } else if (IsProxyClass()) { 745 mirror::ObjectArray<mirror::Class>* interfaces = GetInterfaces(); 746 return interfaces != nullptr ? interfaces->GetLength() : 0; 747 } else { 748 const DexFile::TypeList* interfaces = GetInterfaceTypeList(); 749 if (interfaces == nullptr) { 750 return 0; 751 } else { 752 return interfaces->Size(); 753 } 754 } 755} 756 757uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) { 758 DCHECK(!IsPrimitive()); 759 DCHECK(!IsArrayClass()); 760 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_; 761} 762 763mirror::Class* Class::GetDirectInterface(Thread* self, ConstHandle<mirror::Class> klass, 764 uint32_t idx) { 765 DCHECK(klass.Get() != nullptr); 766 DCHECK(!klass->IsPrimitive()); 767 if (klass->IsArrayClass()) { 768 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 769 if (idx == 0) { 770 return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;"); 771 } else { 772 DCHECK_EQ(1U, idx); 773 return class_linker->FindSystemClass(self, "Ljava/io/Serializable;"); 774 } 775 } else if (klass->IsProxyClass()) { 776 mirror::ObjectArray<mirror::Class>* interfaces = klass.Get()->GetInterfaces(); 777 DCHECK(interfaces != nullptr); 778 return interfaces->Get(idx); 779 } else { 780 uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx); 781 mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx); 782 if (interface == nullptr) { 783 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx, 784 klass.Get()); 785 CHECK(interface != nullptr || self->IsExceptionPending()); 786 } 787 return interface; 788 } 789} 790 791const char* Class::GetSourceFile() { 792 const DexFile& dex_file = GetDexFile(); 793 const DexFile::ClassDef* dex_class_def = GetClassDef(); 794 if (dex_class_def == nullptr) { 795 // Generated classes have no class def. 796 return nullptr; 797 } 798 return dex_file.GetSourceFile(*dex_class_def); 799} 800 801std::string Class::GetLocation() { 802 mirror::DexCache* dex_cache = GetDexCache(); 803 if (dex_cache != nullptr && !IsProxyClass()) { 804 return dex_cache->GetLocation()->ToModifiedUtf8(); 805 } 806 // Arrays and proxies are generated and have no corresponding dex file location. 807 return "generated class"; 808} 809 810const DexFile::TypeList* Class::GetInterfaceTypeList() { 811 const DexFile::ClassDef* class_def = GetClassDef(); 812 if (class_def == nullptr) { 813 return nullptr; 814 } 815 return GetDexFile().GetInterfacesList(*class_def); 816} 817 818void Class::PopulateEmbeddedImtAndVTable() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 819 ObjectArray<ArtMethod>* table = GetImTable(); 820 if (table != nullptr) { 821 for (uint32_t i = 0; i < kImtSize; i++) { 822 SetEmbeddedImTableEntry(i, table->Get(i)); 823 } 824 } 825 826 table = GetVTableDuringLinking(); 827 CHECK(table != nullptr) << PrettyClass(this); 828 SetEmbeddedVTableLength(table->GetLength()); 829 for (int32_t i = 0; i < table->GetLength(); i++) { 830 SetEmbeddedVTableEntry(i, table->Get(i)); 831 } 832 833 SetImTable(nullptr); 834 // Keep java.lang.Object class's vtable around for since it's easier 835 // to be reused by array classes during their linking. 836 if (!IsObjectClass()) { 837 SetVTable(nullptr); 838 } 839} 840 841// The pre-fence visitor for Class::CopyOf(). 842class CopyClassVisitor { 843 public: 844 explicit CopyClassVisitor(Thread* self, Handle<mirror::Class>* orig, 845 size_t new_length, size_t copy_bytes) 846 : self_(self), orig_(orig), new_length_(new_length), 847 copy_bytes_(copy_bytes) { 848 } 849 850 void operator()(Object* obj, size_t usable_size) const 851 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 852 UNUSED(usable_size); 853 mirror::Class* new_class_obj = obj->AsClass(); 854 mirror::Object::CopyObject(self_, new_class_obj, orig_->Get(), copy_bytes_); 855 new_class_obj->SetStatus(Class::kStatusResolving, self_); 856 new_class_obj->PopulateEmbeddedImtAndVTable(); 857 new_class_obj->SetClassSize(new_length_); 858 } 859 860 private: 861 Thread* const self_; 862 Handle<mirror::Class>* const orig_; 863 const size_t new_length_; 864 const size_t copy_bytes_; 865 DISALLOW_COPY_AND_ASSIGN(CopyClassVisitor); 866}; 867 868Class* Class::CopyOf(Thread* self, int32_t new_length) { 869 DCHECK_GE(new_length, static_cast<int32_t>(sizeof(Class))); 870 // We may get copied by a compacting GC. 871 StackHandleScope<1> hs(self); 872 Handle<mirror::Class> h_this(hs.NewHandle(this)); 873 gc::Heap* heap = Runtime::Current()->GetHeap(); 874 // The num_bytes (3rd param) is sizeof(Class) as opposed to SizeOf() 875 // to skip copying the tail part that we will overwrite here. 876 CopyClassVisitor visitor(self, &h_this, new_length, sizeof(Class)); 877 878 mirror::Object* new_class = 879 kMovingClasses 880 ? heap->AllocObject<true>(self, java_lang_Class_.Read(), new_length, visitor) 881 : heap->AllocNonMovableObject<true>(self, java_lang_Class_.Read(), new_length, visitor); 882 if (UNLIKELY(new_class == nullptr)) { 883 CHECK(self->IsExceptionPending()); // Expect an OOME. 884 return NULL; 885 } 886 887 return new_class->AsClass(); 888} 889 890} // namespace mirror 891} // namespace art 892