class.cc revision 4f1ebc2b86c8467d1ecb3ec655316e6d7ee8b8b5
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-inl.h" 22#include "class_linker.h" 23#include "class_loader.h" 24#include "dex_cache.h" 25#include "dex_file-inl.h" 26#include "gc/accounting/card_table-inl.h" 27#include "object-inl.h" 28#include "object_array-inl.h" 29#include "object_utils.h" 30#include "runtime.h" 31#include "handle_scope-inl.h" 32#include "thread.h" 33#include "throwable.h" 34#include "utils.h" 35#include "well_known_classes.h" 36 37namespace art { 38namespace mirror { 39 40Class* Class::java_lang_Class_ = nullptr; 41 42void Class::SetClassClass(Class* java_lang_Class) { 43 CHECK(java_lang_Class_ == nullptr) 44 << ReadBarrier::BarrierForRoot<mirror::Class, kWithReadBarrier>(&java_lang_Class_) 45 << " " << java_lang_Class; 46 CHECK(java_lang_Class != nullptr); 47 java_lang_Class_ = java_lang_Class; 48} 49 50void Class::ResetClass() { 51 CHECK(java_lang_Class_ != nullptr); 52 java_lang_Class_ = nullptr; 53} 54 55void Class::VisitRoots(RootCallback* callback, void* arg) { 56 if (java_lang_Class_ != nullptr) { 57 callback(reinterpret_cast<mirror::Object**>(&java_lang_Class_), arg, 0, kRootStickyClass); 58 } 59} 60 61void Class::SetStatus(Status new_status, Thread* self) { 62 Status old_status = GetStatus(); 63 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 64 bool class_linker_initialized = class_linker != nullptr && class_linker->IsInitialized(); 65 if (LIKELY(class_linker_initialized)) { 66 if (UNLIKELY(new_status <= old_status && new_status != kStatusError)) { 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 // clear exception to call FindSystemClass 91 self->ClearException(); 92 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 93 Class* eiie_class = class_linker->FindSystemClass(self, 94 "Ljava/lang/ExceptionInInitializerError;"); 95 CHECK(!self->IsExceptionPending()); 96 97 // Only verification errors, not initialization problems, should set a verify error. 98 // This is to ensure that ThrowEarlierClassFailure will throw NoClassDefFoundError in that case. 99 Class* exception_class = old_exception->GetClass(); 100 if (!eiie_class->IsAssignableFrom(exception_class)) { 101 SetVerifyErrorClass(exception_class); 102 } 103 104 // Restore exception. 105 ThrowLocation gc_safe_throw_location(old_throw_this_object.Get(), old_throw_method.Get(), 106 old_throw_dex_pc); 107 self->SetException(gc_safe_throw_location, old_exception.Get()); 108 self->SetExceptionReportedToInstrumentation(is_exception_reported); 109 } 110 COMPILE_ASSERT(sizeof(Status) == sizeof(uint32_t), size_of_status_not_uint32); 111 if (Runtime::Current()->IsActiveTransaction()) { 112 SetField32Volatile<true>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 113 } else { 114 SetField32Volatile<false>(OFFSET_OF_OBJECT_MEMBER(Class, status_), new_status); 115 } 116 // Classes that are being resolved or initialized need to notify waiters that the class status 117 // changed. See ClassLinker::EnsureResolved and ClassLinker::WaitForInitializeClass. 118 if ((old_status >= kStatusResolved || new_status >= kStatusResolved) && 119 class_linker_initialized) { 120 NotifyAll(self); 121 } 122} 123 124void Class::SetDexCache(DexCache* new_dex_cache) { 125 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_), new_dex_cache); 126} 127 128void Class::SetClassSize(uint32_t new_class_size) { 129 if (kIsDebugBuild && (new_class_size < GetClassSize())) { 130 DumpClass(LOG(ERROR), kDumpClassFullDetail); 131 CHECK_GE(new_class_size, GetClassSize()) << " class=" << PrettyTypeOf(this); 132 } 133 // Not called within a transaction. 134 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_size_), new_class_size); 135} 136 137// Return the class' name. The exact format is bizarre, but it's the specified behavior for 138// Class.getName: keywords for primitive types, regular "[I" form for primitive arrays (so "int" 139// but "[I"), and arrays of reference types written between "L" and ";" but with dots rather than 140// slashes (so "java.lang.String" but "[Ljava.lang.String;"). Madness. 141String* Class::ComputeName(Handle<Class> h_this) { 142 String* name = h_this->GetName(); 143 if (name != nullptr) { 144 return name; 145 } 146 std::string descriptor(h_this->GetDescriptor()); 147 Thread* self = Thread::Current(); 148 if ((descriptor[0] != 'L') && (descriptor[0] != '[')) { 149 // The descriptor indicates that this is the class for 150 // a primitive type; special-case the return value. 151 const char* c_name = nullptr; 152 switch (descriptor[0]) { 153 case 'Z': c_name = "boolean"; break; 154 case 'B': c_name = "byte"; break; 155 case 'C': c_name = "char"; break; 156 case 'S': c_name = "short"; break; 157 case 'I': c_name = "int"; break; 158 case 'J': c_name = "long"; break; 159 case 'F': c_name = "float"; break; 160 case 'D': c_name = "double"; break; 161 case 'V': c_name = "void"; break; 162 default: 163 LOG(FATAL) << "Unknown primitive type: " << PrintableChar(descriptor[0]); 164 } 165 name = String::AllocFromModifiedUtf8(self, c_name); 166 } else { 167 // Convert the UTF-8 name to a java.lang.String. The name must use '.' to separate package 168 // components. 169 if (descriptor.size() > 2 && descriptor[0] == 'L' && descriptor[descriptor.size() - 1] == ';') { 170 descriptor.erase(0, 1); 171 descriptor.erase(descriptor.size() - 1); 172 } 173 std::replace(descriptor.begin(), descriptor.end(), '/', '.'); 174 name = String::AllocFromModifiedUtf8(self, descriptor.c_str()); 175 } 176 h_this->SetName(name); 177 return name; 178} 179 180void Class::DumpClass(std::ostream& os, int flags) { 181 if ((flags & kDumpClassFullDetail) == 0) { 182 os << PrettyClass(this); 183 if ((flags & kDumpClassClassLoader) != 0) { 184 os << ' ' << GetClassLoader(); 185 } 186 if ((flags & kDumpClassInitialized) != 0) { 187 os << ' ' << GetStatus(); 188 } 189 os << "\n"; 190 return; 191 } 192 193 Thread* self = Thread::Current(); 194 StackHandleScope<2> hs(self); 195 Handle<mirror::Class> h_this(hs.NewHandle(this)); 196 Handle<mirror::Class> h_super(hs.NewHandle(GetSuperClass())); 197 198 os << "----- " << (IsInterface() ? "interface" : "class") << " " 199 << "'" << GetDescriptor() << "' cl=" << GetClassLoader() << " -----\n", 200 os << " objectSize=" << SizeOf() << " " 201 << "(" << (h_super.Get() != nullptr ? h_super->SizeOf() : -1) << " from super)\n", 202 os << StringPrintf(" access=0x%04x.%04x\n", 203 GetAccessFlags() >> 16, GetAccessFlags() & kAccJavaFlagsMask); 204 if (h_super.Get() != nullptr) { 205 os << " super='" << PrettyClass(h_super.Get()) << "' (cl=" << h_super->GetClassLoader() 206 << ")\n"; 207 } 208 if (IsArrayClass()) { 209 os << " componentType=" << PrettyClass(GetComponentType()) << "\n"; 210 } 211 const size_t num_direct_interfaces = NumDirectInterfaces(); 212 if (num_direct_interfaces > 0) { 213 os << " interfaces (" << num_direct_interfaces << "):\n"; 214 for (size_t i = 0; i < num_direct_interfaces; ++i) { 215 Class* interface = GetDirectInterface(self, h_this, i); 216 const ClassLoader* cl = interface->GetClassLoader(); 217 os << StringPrintf(" %2zd: %s (cl=%p)\n", i, PrettyClass(interface).c_str(), cl); 218 } 219 } 220 // After this point, this may have moved due to GetDirectInterface. 221 os << " vtable (" << h_this->NumVirtualMethods() << " entries, " 222 << (h_super.Get() != nullptr ? h_super->NumVirtualMethods() : 0) << " in super):\n"; 223 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 224 os << StringPrintf(" %2zd: %s\n", i, 225 PrettyMethod(h_this->GetVirtualMethodDuringLinking(i)).c_str()); 226 } 227 os << " direct methods (" << h_this->NumDirectMethods() << " entries):\n"; 228 for (size_t i = 0; i < h_this->NumDirectMethods(); ++i) { 229 os << StringPrintf(" %2zd: %s\n", i, PrettyMethod(h_this->GetDirectMethod(i)).c_str()); 230 } 231 if (h_this->NumStaticFields() > 0) { 232 os << " static fields (" << h_this->NumStaticFields() << " entries):\n"; 233 if (h_this->IsResolved() || h_this->IsErroneous()) { 234 for (size_t i = 0; i < h_this->NumStaticFields(); ++i) { 235 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetStaticField(i)).c_str()); 236 } 237 } else { 238 os << " <not yet available>"; 239 } 240 } 241 if (h_this->NumInstanceFields() > 0) { 242 os << " instance fields (" << h_this->NumInstanceFields() << " entries):\n"; 243 if (h_this->IsResolved() || h_this->IsErroneous()) { 244 for (size_t i = 0; i < h_this->NumInstanceFields(); ++i) { 245 os << StringPrintf(" %2zd: %s\n", i, PrettyField(h_this->GetInstanceField(i)).c_str()); 246 } 247 } else { 248 os << " <not yet available>"; 249 } 250 } 251} 252 253void Class::SetReferenceInstanceOffsets(uint32_t new_reference_offsets) { 254 if (new_reference_offsets != CLASS_WALK_SUPER) { 255 // Sanity check that the number of bits set in the reference offset bitmap 256 // agrees with the number of references 257 size_t count = 0; 258 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 259 count += c->NumReferenceInstanceFieldsDuringLinking(); 260 } 261 CHECK_EQ((size_t)POPCOUNT(new_reference_offsets), count); 262 } 263 // Not called within a transaction. 264 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_), 265 new_reference_offsets); 266} 267 268void Class::SetReferenceStaticOffsets(uint32_t new_reference_offsets) { 269 if (new_reference_offsets != CLASS_WALK_SUPER) { 270 // Sanity check that the number of bits set in the reference offset bitmap 271 // agrees with the number of references 272 CHECK_EQ((size_t)POPCOUNT(new_reference_offsets), 273 NumReferenceStaticFieldsDuringLinking()); 274 } 275 // Not called within a transaction. 276 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, reference_static_offsets_), 277 new_reference_offsets); 278} 279 280bool Class::IsInSamePackage(const StringPiece& descriptor1, const StringPiece& descriptor2) { 281 size_t i = 0; 282 while (descriptor1[i] != '\0' && descriptor1[i] == descriptor2[i]) { 283 ++i; 284 } 285 if (descriptor1.find('/', i) != StringPiece::npos || 286 descriptor2.find('/', i) != StringPiece::npos) { 287 return false; 288 } else { 289 return true; 290 } 291} 292 293bool Class::IsInSamePackage(Class* that) { 294 Class* klass1 = this; 295 Class* klass2 = that; 296 if (klass1 == klass2) { 297 return true; 298 } 299 // Class loaders must match. 300 if (klass1->GetClassLoader() != klass2->GetClassLoader()) { 301 return false; 302 } 303 // Arrays are in the same package when their element classes are. 304 while (klass1->IsArrayClass()) { 305 klass1 = klass1->GetComponentType(); 306 } 307 while (klass2->IsArrayClass()) { 308 klass2 = klass2->GetComponentType(); 309 } 310 // trivial check again for array types 311 if (klass1 == klass2) { 312 return true; 313 } 314 // Compare the package part of the descriptor string. 315 return IsInSamePackage(klass1->GetDescriptor().c_str(), klass2->GetDescriptor().c_str()); 316} 317 318bool Class::IsStringClass() const { 319 return this == String::GetJavaLangString(); 320} 321 322bool Class::IsThrowableClass() { 323 return WellKnownClasses::ToClass(WellKnownClasses::java_lang_Throwable)->IsAssignableFrom(this); 324} 325 326void Class::SetClassLoader(ClassLoader* new_class_loader) { 327 if (Runtime::Current()->IsActiveTransaction()) { 328 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 329 } else { 330 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader); 331 } 332} 333 334ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const StringPiece& signature) { 335 // Check the current class before checking the interfaces. 336 ArtMethod* method = FindDeclaredVirtualMethod(name, signature); 337 if (method != nullptr) { 338 return method; 339 } 340 341 int32_t iftable_count = GetIfTableCount(); 342 IfTable* iftable = GetIfTable(); 343 for (int32_t i = 0; i < iftable_count; ++i) { 344 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature); 345 if (method != nullptr) { 346 return method; 347 } 348 } 349 return nullptr; 350} 351 352ArtMethod* Class::FindInterfaceMethod(const StringPiece& name, const Signature& signature) { 353 // Check the current class before checking the interfaces. 354 ArtMethod* method = FindDeclaredVirtualMethod(name, signature); 355 if (method != nullptr) { 356 return method; 357 } 358 359 int32_t iftable_count = GetIfTableCount(); 360 IfTable* iftable = GetIfTable(); 361 for (int32_t i = 0; i < iftable_count; ++i) { 362 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(name, signature); 363 if (method != nullptr) { 364 return method; 365 } 366 } 367 return nullptr; 368} 369 370ArtMethod* Class::FindInterfaceMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 371 // Check the current class before checking the interfaces. 372 ArtMethod* method = FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 373 if (method != nullptr) { 374 return method; 375 } 376 377 int32_t iftable_count = GetIfTableCount(); 378 IfTable* iftable = GetIfTable(); 379 for (int32_t i = 0; i < iftable_count; ++i) { 380 method = iftable->GetInterface(i)->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 381 if (method != nullptr) { 382 return method; 383 } 384 } 385 return nullptr; 386} 387 388ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const StringPiece& signature) { 389 for (size_t i = 0; i < NumDirectMethods(); ++i) { 390 ArtMethod* method = GetDirectMethod(i); 391 if (name == method->GetName() && method->GetSignature() == signature) { 392 return method; 393 } 394 } 395 return nullptr; 396} 397 398ArtMethod* Class::FindDeclaredDirectMethod(const StringPiece& name, const Signature& signature) { 399 for (size_t i = 0; i < NumDirectMethods(); ++i) { 400 ArtMethod* method = GetDirectMethod(i); 401 if (name == method->GetName() && signature == method->GetSignature()) { 402 return method; 403 } 404 } 405 return nullptr; 406} 407 408ArtMethod* Class::FindDeclaredDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 409 if (GetDexCache() == dex_cache) { 410 for (size_t i = 0; i < NumDirectMethods(); ++i) { 411 ArtMethod* method = GetDirectMethod(i); 412 if (method->GetDexMethodIndex() == dex_method_idx) { 413 return method; 414 } 415 } 416 } 417 return nullptr; 418} 419 420ArtMethod* Class::FindDirectMethod(const StringPiece& name, const StringPiece& signature) { 421 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 422 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature); 423 if (method != nullptr) { 424 return method; 425 } 426 } 427 return nullptr; 428} 429 430ArtMethod* Class::FindDirectMethod(const StringPiece& name, const Signature& signature) { 431 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 432 ArtMethod* method = klass->FindDeclaredDirectMethod(name, signature); 433 if (method != nullptr) { 434 return method; 435 } 436 } 437 return nullptr; 438} 439 440ArtMethod* Class::FindDirectMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 441 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 442 ArtMethod* method = klass->FindDeclaredDirectMethod(dex_cache, dex_method_idx); 443 if (method != nullptr) { 444 return method; 445 } 446 } 447 return nullptr; 448} 449 450ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const StringPiece& signature) { 451 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 452 ArtMethod* method = GetVirtualMethod(i); 453 if (name == method->GetName() && method->GetSignature() == signature) { 454 return method; 455 } 456 } 457 return nullptr; 458} 459 460ArtMethod* Class::FindDeclaredVirtualMethod(const StringPiece& name, const Signature& signature) { 461 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 462 ArtMethod* method = GetVirtualMethod(i); 463 if (name == method->GetName() && signature == method->GetSignature()) { 464 return method; 465 } 466 } 467 return nullptr; 468} 469 470ArtMethod* Class::FindDeclaredVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 471 if (GetDexCache() == dex_cache) { 472 for (size_t i = 0; i < NumVirtualMethods(); ++i) { 473 ArtMethod* method = GetVirtualMethod(i); 474 if (method->GetDexMethodIndex() == dex_method_idx) { 475 return method; 476 } 477 } 478 } 479 return nullptr; 480} 481 482ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const StringPiece& signature) { 483 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 484 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 485 if (method != nullptr) { 486 return method; 487 } 488 } 489 return nullptr; 490} 491 492ArtMethod* Class::FindVirtualMethod(const StringPiece& name, const Signature& signature) { 493 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 494 ArtMethod* method = klass->FindDeclaredVirtualMethod(name, signature); 495 if (method != nullptr) { 496 return method; 497 } 498 } 499 return nullptr; 500} 501 502ArtMethod* Class::FindVirtualMethod(const DexCache* dex_cache, uint32_t dex_method_idx) { 503 for (Class* klass = this; klass != nullptr; klass = klass->GetSuperClass()) { 504 ArtMethod* method = klass->FindDeclaredVirtualMethod(dex_cache, dex_method_idx); 505 if (method != nullptr) { 506 return method; 507 } 508 } 509 return nullptr; 510} 511 512ArtMethod* Class::FindClassInitializer() { 513 for (size_t i = 0; i < NumDirectMethods(); ++i) { 514 ArtMethod* method = GetDirectMethod(i); 515 if (method->IsClassInitializer()) { 516 DCHECK_STREQ(method->GetName(), "<clinit>"); 517 DCHECK_STREQ(method->GetSignature().ToString().c_str(), "()V"); 518 return method; 519 } 520 } 521 return nullptr; 522} 523 524ArtField* Class::FindDeclaredInstanceField(const StringPiece& name, const StringPiece& type) { 525 // Is the field in this class? 526 // Interfaces are not relevant because they can't contain instance fields. 527 for (size_t i = 0; i < NumInstanceFields(); ++i) { 528 ArtField* f = GetInstanceField(i); 529 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 530 return f; 531 } 532 } 533 return nullptr; 534} 535 536ArtField* Class::FindDeclaredInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 537 if (GetDexCache() == dex_cache) { 538 for (size_t i = 0; i < NumInstanceFields(); ++i) { 539 ArtField* f = GetInstanceField(i); 540 if (f->GetDexFieldIndex() == dex_field_idx) { 541 return f; 542 } 543 } 544 } 545 return nullptr; 546} 547 548ArtField* Class::FindInstanceField(const StringPiece& name, const StringPiece& type) { 549 // Is the field in this class, or any of its superclasses? 550 // Interfaces are not relevant because they can't contain instance fields. 551 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 552 ArtField* f = c->FindDeclaredInstanceField(name, type); 553 if (f != nullptr) { 554 return f; 555 } 556 } 557 return nullptr; 558} 559 560ArtField* Class::FindInstanceField(const DexCache* dex_cache, uint32_t dex_field_idx) { 561 // Is the field in this class, or any of its superclasses? 562 // Interfaces are not relevant because they can't contain instance fields. 563 for (Class* c = this; c != nullptr; c = c->GetSuperClass()) { 564 ArtField* f = c->FindDeclaredInstanceField(dex_cache, dex_field_idx); 565 if (f != nullptr) { 566 return f; 567 } 568 } 569 return nullptr; 570} 571 572ArtField* Class::FindDeclaredStaticField(const StringPiece& name, const StringPiece& type) { 573 DCHECK(type != nullptr); 574 for (size_t i = 0; i < NumStaticFields(); ++i) { 575 ArtField* f = GetStaticField(i); 576 if (name == f->GetName() && type == f->GetTypeDescriptor()) { 577 return f; 578 } 579 } 580 return nullptr; 581} 582 583ArtField* Class::FindDeclaredStaticField(const DexCache* dex_cache, uint32_t dex_field_idx) { 584 if (dex_cache == GetDexCache()) { 585 for (size_t i = 0; i < NumStaticFields(); ++i) { 586 ArtField* f = GetStaticField(i); 587 if (f->GetDexFieldIndex() == dex_field_idx) { 588 return f; 589 } 590 } 591 } 592 return nullptr; 593} 594 595ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const StringPiece& name, 596 const StringPiece& type) { 597 // Is the field in this class (or its interfaces), or any of its 598 // superclasses (or their interfaces)? 599 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 600 // Is the field in this class? 601 ArtField* f = k->FindDeclaredStaticField(name, type); 602 if (f != nullptr) { 603 return f; 604 } 605 // Wrap k incase it moves during GetDirectInterface. 606 StackHandleScope<1> hs(self); 607 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 608 // Is this field in any of this class' interfaces? 609 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 610 StackHandleScope<1> hs(self); 611 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 612 f = FindStaticField(self, interface, name, type); 613 if (f != nullptr) { 614 return f; 615 } 616 } 617 } 618 return nullptr; 619} 620 621ArtField* Class::FindStaticField(Thread* self, Handle<Class> klass, const DexCache* dex_cache, 622 uint32_t dex_field_idx) { 623 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 624 // Is the field in this class? 625 ArtField* f = k->FindDeclaredStaticField(dex_cache, dex_field_idx); 626 if (f != nullptr) { 627 return f; 628 } 629 // Wrap k incase it moves during GetDirectInterface. 630 StackHandleScope<1> hs(self); 631 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 632 // Is this field in any of this class' interfaces? 633 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 634 StackHandleScope<1> hs(self); 635 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 636 f = FindStaticField(self, interface, dex_cache, dex_field_idx); 637 if (f != nullptr) { 638 return f; 639 } 640 } 641 } 642 return nullptr; 643} 644 645ArtField* Class::FindField(Thread* self, Handle<Class> klass, const StringPiece& name, 646 const StringPiece& type) { 647 // Find a field using the JLS field resolution order 648 for (Class* k = klass.Get(); k != nullptr; k = k->GetSuperClass()) { 649 // Is the field in this class? 650 ArtField* f = k->FindDeclaredInstanceField(name, type); 651 if (f != nullptr) { 652 return f; 653 } 654 f = k->FindDeclaredStaticField(name, type); 655 if (f != nullptr) { 656 return f; 657 } 658 // Is this field in any of this class' interfaces? 659 StackHandleScope<1> hs(self); 660 HandleWrapper<mirror::Class> h_k(hs.NewHandleWrapper(&k)); 661 for (uint32_t i = 0; i < h_k->NumDirectInterfaces(); ++i) { 662 StackHandleScope<1> hs(self); 663 Handle<mirror::Class> interface(hs.NewHandle(GetDirectInterface(self, h_k, i))); 664 f = interface->FindStaticField(self, interface, name, type); 665 if (f != nullptr) { 666 return f; 667 } 668 } 669 } 670 return nullptr; 671} 672 673static void SetPreverifiedFlagOnMethods(mirror::ObjectArray<mirror::ArtMethod>* methods) 674 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 675 if (methods != nullptr) { 676 for (int32_t index = 0, end = methods->GetLength(); index < end; ++index) { 677 mirror::ArtMethod* method = methods->GetWithoutChecks(index); 678 DCHECK(method != nullptr); 679 if (!method->IsNative() && !method->IsAbstract()) { 680 method->SetPreverified(); 681 } 682 } 683 } 684} 685 686void Class::SetPreverifiedFlagOnAllMethods() { 687 DCHECK(IsVerified()); 688 SetPreverifiedFlagOnMethods(GetDirectMethods()); 689 SetPreverifiedFlagOnMethods(GetVirtualMethods()); 690} 691 692std::string Class::GetDescriptor() { 693 if (UNLIKELY(IsArrayClass())) { 694 return GetArrayDescriptor(); 695 } else if (UNLIKELY(IsPrimitive())) { 696 return Primitive::Descriptor(GetPrimitiveType()); 697 } else if (UNLIKELY(IsProxyClass())) { 698 return Runtime::Current()->GetClassLinker()->GetDescriptorForProxy(this); 699 } else { 700 const DexFile& dex_file = GetDexFile(); 701 const DexFile::TypeId& type_id = dex_file.GetTypeId(GetClassDef()->class_idx_); 702 return dex_file.GetTypeDescriptor(type_id); 703 } 704} 705 706std::string Class::GetArrayDescriptor() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 707 return "[" + GetComponentType()->GetDescriptor(); 708} 709 710const DexFile::ClassDef* Class::GetClassDef() { 711 uint16_t class_def_idx = GetDexClassDefIndex(); 712 if (class_def_idx == DexFile::kDexNoIndex16) { 713 return nullptr; 714 } 715 return &GetDexFile().GetClassDef(class_def_idx); 716} 717 718uint32_t Class::NumDirectInterfaces() { 719 if (IsPrimitive()) { 720 return 0; 721 } else if (IsArrayClass()) { 722 return 2; 723 } else if (IsProxyClass()) { 724 mirror::SynthesizedProxyClass* proxy_class= 725 reinterpret_cast<mirror::SynthesizedProxyClass*>(this); 726 mirror::ObjectArray<mirror::Class>* interfaces = proxy_class->GetInterfaces(); 727 return interfaces != nullptr ? interfaces->GetLength() : 0; 728 } else { 729 const DexFile::TypeList* interfaces = GetInterfaceTypeList(); 730 if (interfaces == nullptr) { 731 return 0; 732 } else { 733 return interfaces->Size(); 734 } 735 } 736} 737 738uint16_t Class::GetDirectInterfaceTypeIdx(uint32_t idx) { 739 DCHECK(!IsPrimitive()); 740 DCHECK(!IsArrayClass()); 741 return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_; 742} 743 744mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass, uint32_t idx) { 745 DCHECK(klass.Get() != nullptr); 746 DCHECK(!klass->IsPrimitive()); 747 if (klass->IsArrayClass()) { 748 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 749 if (idx == 0) { 750 return class_linker->FindSystemClass(self, "Ljava/lang/Cloneable;"); 751 } else { 752 DCHECK_EQ(1U, idx); 753 return class_linker->FindSystemClass(self, "Ljava/io/Serializable;"); 754 } 755 } else if (klass->IsProxyClass()) { 756 mirror::SynthesizedProxyClass* proxy_class = 757 reinterpret_cast<mirror::SynthesizedProxyClass*>(klass.Get()); 758 mirror::ObjectArray<mirror::Class>* interfaces = proxy_class->GetInterfaces(); 759 DCHECK(interfaces != nullptr); 760 return interfaces->Get(idx); 761 } else { 762 uint16_t type_idx = klass->GetDirectInterfaceTypeIdx(idx); 763 mirror::Class* interface = klass->GetDexCache()->GetResolvedType(type_idx); 764 if (interface == nullptr) { 765 interface = Runtime::Current()->GetClassLinker()->ResolveType(klass->GetDexFile(), type_idx, 766 klass.Get()); 767 CHECK(interface != nullptr || self->IsExceptionPending()); 768 } 769 return interface; 770 } 771} 772 773const char* Class::GetSourceFile() { 774 std::string descriptor(GetDescriptor()); 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} 800 801} // namespace mirror 802} // namespace art 803