1 /* 2 * Copyright (C) 2012 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 #ifndef ART_RUNTIME_ENTRYPOINTS_ENTRYPOINT_UTILS_INL_H_ 18 #define ART_RUNTIME_ENTRYPOINTS_ENTRYPOINT_UTILS_INL_H_ 19 20 #include "entrypoint_utils.h" 21 22 #include "art_field-inl.h" 23 #include "art_method-inl.h" 24 #include "base/enums.h" 25 #include "class_linker-inl.h" 26 #include "common_throws.h" 27 #include "dex_file.h" 28 #include "entrypoints/quick/callee_save_frame.h" 29 #include "handle_scope-inl.h" 30 #include "imt_conflict_table.h" 31 #include "imtable-inl.h" 32 #include "indirect_reference_table.h" 33 #include "invoke_type.h" 34 #include "jni_internal.h" 35 #include "mirror/array.h" 36 #include "mirror/class-inl.h" 37 #include "mirror/object-inl.h" 38 #include "mirror/throwable.h" 39 #include "nth_caller_visitor.h" 40 #include "runtime.h" 41 #include "stack_map.h" 42 #include "thread.h" 43 #include "well_known_classes.h" 44 45 namespace art { 46 47 inline ArtMethod* GetResolvedMethod(ArtMethod* outer_method, 48 const MethodInfo& method_info, 49 const InlineInfo& inline_info, 50 const InlineInfoEncoding& encoding, 51 uint8_t inlining_depth) 52 REQUIRES_SHARED(Locks::mutator_lock_) { 53 DCHECK(!outer_method->IsObsolete()); 54 55 // This method is being used by artQuickResolutionTrampoline, before it sets up 56 // the passed parameters in a GC friendly way. Therefore we must never be 57 // suspended while executing it. 58 ScopedAssertNoThreadSuspension sants(__FUNCTION__); 59 60 if (inline_info.EncodesArtMethodAtDepth(encoding, inlining_depth)) { 61 return inline_info.GetArtMethodAtDepth(encoding, inlining_depth); 62 } 63 64 uint32_t method_index = inline_info.GetMethodIndexAtDepth(encoding, method_info, inlining_depth); 65 if (inline_info.GetDexPcAtDepth(encoding, inlining_depth) == static_cast<uint32_t>(-1)) { 66 // "charAt" special case. It is the only non-leaf method we inline across dex files. 67 ArtMethod* inlined_method = jni::DecodeArtMethod(WellKnownClasses::java_lang_String_charAt); 68 DCHECK_EQ(inlined_method->GetDexMethodIndex(), method_index); 69 return inlined_method; 70 } 71 72 // Find which method did the call in the inlining hierarchy. 73 ArtMethod* caller = outer_method; 74 if (inlining_depth != 0) { 75 caller = GetResolvedMethod(outer_method, 76 method_info, 77 inline_info, 78 encoding, 79 inlining_depth - 1); 80 } 81 82 // Lookup the declaring class of the inlined method. 83 ObjPtr<mirror::DexCache> dex_cache = caller->GetDexCache(); 84 const DexFile* dex_file = dex_cache->GetDexFile(); 85 const DexFile::MethodId& method_id = dex_file->GetMethodId(method_index); 86 ArtMethod* inlined_method = caller->GetDexCacheResolvedMethod(method_index, kRuntimePointerSize); 87 if (inlined_method != nullptr) { 88 DCHECK(!inlined_method->IsRuntimeMethod()); 89 return inlined_method; 90 } 91 const char* descriptor = dex_file->StringByTypeIdx(method_id.class_idx_); 92 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 93 Thread* self = Thread::Current(); 94 mirror::ClassLoader* class_loader = caller->GetDeclaringClass()->GetClassLoader(); 95 mirror::Class* klass = class_linker->LookupClass(self, descriptor, class_loader); 96 if (klass == nullptr) { 97 LOG(FATAL) << "Could not find an inlined method from an .oat file: the class " << descriptor 98 << " was not found in the class loader of " << caller->PrettyMethod() << ". " 99 << "This must be due to playing wrongly with class loaders"; 100 } 101 102 inlined_method = klass->FindClassMethod(dex_cache, method_index, kRuntimePointerSize); 103 if (inlined_method == nullptr) { 104 LOG(FATAL) << "Could not find an inlined method from an .oat file: the class " << descriptor 105 << " does not have " << dex_file->GetMethodName(method_id) 106 << dex_file->GetMethodSignature(method_id) << " declared. " 107 << "This must be due to duplicate classes or playing wrongly with class loaders"; 108 } 109 caller->SetDexCacheResolvedMethod(method_index, inlined_method, kRuntimePointerSize); 110 111 return inlined_method; 112 } 113 114 ALWAYS_INLINE inline mirror::Class* CheckObjectAlloc(mirror::Class* klass, 115 Thread* self, 116 bool* slow_path) 117 REQUIRES_SHARED(Locks::mutator_lock_) 118 REQUIRES(!Roles::uninterruptible_) { 119 if (UNLIKELY(!klass->IsInstantiable())) { 120 self->ThrowNewException("Ljava/lang/InstantiationError;", klass->PrettyDescriptor().c_str()); 121 *slow_path = true; 122 return nullptr; // Failure 123 } 124 if (UNLIKELY(klass->IsClassClass())) { 125 ThrowIllegalAccessError(nullptr, "Class %s is inaccessible", 126 klass->PrettyDescriptor().c_str()); 127 *slow_path = true; 128 return nullptr; // Failure 129 } 130 if (UNLIKELY(!klass->IsInitialized())) { 131 StackHandleScope<1> hs(self); 132 Handle<mirror::Class> h_klass(hs.NewHandle(klass)); 133 // EnsureInitialized (the class initializer) might cause a GC. 134 // may cause us to suspend meaning that another thread may try to 135 // change the allocator while we are stuck in the entrypoints of 136 // an old allocator. Also, the class initialization may fail. To 137 // handle these cases we mark the slow path boolean as true so 138 // that the caller knows to check the allocator type to see if it 139 // has changed and to null-check the return value in case the 140 // initialization fails. 141 *slow_path = true; 142 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_klass, true, true)) { 143 DCHECK(self->IsExceptionPending()); 144 return nullptr; // Failure 145 } else { 146 DCHECK(!self->IsExceptionPending()); 147 } 148 return h_klass.Get(); 149 } 150 return klass; 151 } 152 153 ALWAYS_INLINE 154 inline mirror::Class* CheckClassInitializedForObjectAlloc(mirror::Class* klass, 155 Thread* self, 156 bool* slow_path) 157 REQUIRES_SHARED(Locks::mutator_lock_) 158 REQUIRES(!Roles::uninterruptible_) { 159 if (UNLIKELY(!klass->IsInitialized())) { 160 StackHandleScope<1> hs(self); 161 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 162 // EnsureInitialized (the class initializer) might cause a GC. 163 // may cause us to suspend meaning that another thread may try to 164 // change the allocator while we are stuck in the entrypoints of 165 // an old allocator. Also, the class initialization may fail. To 166 // handle these cases we mark the slow path boolean as true so 167 // that the caller knows to check the allocator type to see if it 168 // has changed and to null-check the return value in case the 169 // initialization fails. 170 *slow_path = true; 171 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) { 172 DCHECK(self->IsExceptionPending()); 173 return nullptr; // Failure 174 } 175 return h_class.Get(); 176 } 177 return klass; 178 } 179 180 // Allocate an instance of klass. Throws InstantationError if klass is not instantiable, 181 // or IllegalAccessError if klass is j.l.Class. Performs a clinit check too. 182 template <bool kInstrumented> 183 ALWAYS_INLINE 184 inline mirror::Object* AllocObjectFromCode(mirror::Class* klass, 185 Thread* self, 186 gc::AllocatorType allocator_type) { 187 bool slow_path = false; 188 klass = CheckObjectAlloc(klass, self, &slow_path); 189 if (UNLIKELY(slow_path)) { 190 if (klass == nullptr) { 191 return nullptr; 192 } 193 // CheckObjectAlloc can cause thread suspension which means we may now be instrumented. 194 return klass->Alloc</*kInstrumented*/true>( 195 self, 196 Runtime::Current()->GetHeap()->GetCurrentAllocator()).Ptr(); 197 } 198 DCHECK(klass != nullptr); 199 return klass->Alloc<kInstrumented>(self, allocator_type).Ptr(); 200 } 201 202 // Given the context of a calling Method and a resolved class, create an instance. 203 template <bool kInstrumented> 204 ALWAYS_INLINE 205 inline mirror::Object* AllocObjectFromCodeResolved(mirror::Class* klass, 206 Thread* self, 207 gc::AllocatorType allocator_type) { 208 DCHECK(klass != nullptr); 209 bool slow_path = false; 210 klass = CheckClassInitializedForObjectAlloc(klass, self, &slow_path); 211 if (UNLIKELY(slow_path)) { 212 if (klass == nullptr) { 213 return nullptr; 214 } 215 gc::Heap* heap = Runtime::Current()->GetHeap(); 216 // Pass in false since the object cannot be finalizable. 217 // CheckClassInitializedForObjectAlloc can cause thread suspension which means we may now be 218 // instrumented. 219 return klass->Alloc</*kInstrumented*/true, false>(self, heap->GetCurrentAllocator()).Ptr(); 220 } 221 // Pass in false since the object cannot be finalizable. 222 return klass->Alloc<kInstrumented, false>(self, allocator_type).Ptr(); 223 } 224 225 // Given the context of a calling Method and an initialized class, create an instance. 226 template <bool kInstrumented> 227 ALWAYS_INLINE 228 inline mirror::Object* AllocObjectFromCodeInitialized(mirror::Class* klass, 229 Thread* self, 230 gc::AllocatorType allocator_type) { 231 DCHECK(klass != nullptr); 232 // Pass in false since the object cannot be finalizable. 233 return klass->Alloc<kInstrumented, false>(self, allocator_type).Ptr(); 234 } 235 236 237 template <bool kAccessCheck> 238 ALWAYS_INLINE 239 inline mirror::Class* CheckArrayAlloc(dex::TypeIndex type_idx, 240 int32_t component_count, 241 ArtMethod* method, 242 bool* slow_path) { 243 if (UNLIKELY(component_count < 0)) { 244 ThrowNegativeArraySizeException(component_count); 245 *slow_path = true; 246 return nullptr; // Failure 247 } 248 mirror::Class* klass = method->GetDexCache()->GetResolvedType(type_idx); 249 if (UNLIKELY(klass == nullptr)) { // Not in dex cache so try to resolve 250 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 251 klass = class_linker->ResolveType(type_idx, method); 252 *slow_path = true; 253 if (klass == nullptr) { // Error 254 DCHECK(Thread::Current()->IsExceptionPending()); 255 return nullptr; // Failure 256 } 257 CHECK(klass->IsArrayClass()) << klass->PrettyClass(); 258 } 259 if (kAccessCheck) { 260 mirror::Class* referrer = method->GetDeclaringClass(); 261 if (UNLIKELY(!referrer->CanAccess(klass))) { 262 ThrowIllegalAccessErrorClass(referrer, klass); 263 *slow_path = true; 264 return nullptr; // Failure 265 } 266 } 267 return klass; 268 } 269 270 // Given the context of a calling Method, use its DexCache to resolve a type to an array Class. If 271 // it cannot be resolved, throw an error. If it can, use it to create an array. 272 // When verification/compiler hasn't been able to verify access, optionally perform an access 273 // check. 274 template <bool kAccessCheck, bool kInstrumented> 275 ALWAYS_INLINE 276 inline mirror::Array* AllocArrayFromCode(dex::TypeIndex type_idx, 277 int32_t component_count, 278 ArtMethod* method, 279 Thread* self, 280 gc::AllocatorType allocator_type) { 281 bool slow_path = false; 282 mirror::Class* klass = CheckArrayAlloc<kAccessCheck>(type_idx, component_count, method, 283 &slow_path); 284 if (UNLIKELY(slow_path)) { 285 if (klass == nullptr) { 286 return nullptr; 287 } 288 gc::Heap* heap = Runtime::Current()->GetHeap(); 289 // CheckArrayAlloc can cause thread suspension which means we may now be instrumented. 290 return mirror::Array::Alloc</*kInstrumented*/true>(self, 291 klass, 292 component_count, 293 klass->GetComponentSizeShift(), 294 heap->GetCurrentAllocator()); 295 } 296 return mirror::Array::Alloc<kInstrumented>(self, klass, component_count, 297 klass->GetComponentSizeShift(), allocator_type); 298 } 299 300 template <bool kInstrumented> 301 ALWAYS_INLINE 302 inline mirror::Array* AllocArrayFromCodeResolved(mirror::Class* klass, 303 int32_t component_count, 304 Thread* self, 305 gc::AllocatorType allocator_type) { 306 DCHECK(klass != nullptr); 307 if (UNLIKELY(component_count < 0)) { 308 ThrowNegativeArraySizeException(component_count); 309 return nullptr; // Failure 310 } 311 // No need to retry a slow-path allocation as the above code won't cause a GC or thread 312 // suspension. 313 return mirror::Array::Alloc<kInstrumented>(self, klass, component_count, 314 klass->GetComponentSizeShift(), allocator_type); 315 } 316 317 template<FindFieldType type, bool access_check> 318 inline ArtField* FindFieldFromCode(uint32_t field_idx, 319 ArtMethod* referrer, 320 Thread* self, 321 size_t expected_size) { 322 bool is_primitive; 323 bool is_set; 324 bool is_static; 325 switch (type) { 326 case InstanceObjectRead: is_primitive = false; is_set = false; is_static = false; break; 327 case InstanceObjectWrite: is_primitive = false; is_set = true; is_static = false; break; 328 case InstancePrimitiveRead: is_primitive = true; is_set = false; is_static = false; break; 329 case InstancePrimitiveWrite: is_primitive = true; is_set = true; is_static = false; break; 330 case StaticObjectRead: is_primitive = false; is_set = false; is_static = true; break; 331 case StaticObjectWrite: is_primitive = false; is_set = true; is_static = true; break; 332 case StaticPrimitiveRead: is_primitive = true; is_set = false; is_static = true; break; 333 case StaticPrimitiveWrite: // Keep GCC happy by having a default handler, fall-through. 334 default: is_primitive = true; is_set = true; is_static = true; break; 335 } 336 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 337 338 ArtField* resolved_field; 339 if (access_check) { 340 // Slow path: According to JLS 13.4.8, a linkage error may occur if a compile-time 341 // qualifying type of a field and the resolved run-time qualifying type of a field differed 342 // in their static-ness. 343 // 344 // In particular, don't assume the dex instruction already correctly knows if the 345 // real field is static or not. The resolution must not be aware of this. 346 ArtMethod* method = referrer->GetInterfaceMethodIfProxy(kRuntimePointerSize); 347 348 StackHandleScope<2> hs(self); 349 Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(method->GetDexCache())); 350 Handle<mirror::ClassLoader> h_class_loader(hs.NewHandle(method->GetClassLoader())); 351 352 resolved_field = class_linker->ResolveFieldJLS(*method->GetDexFile(), 353 field_idx, 354 h_dex_cache, 355 h_class_loader); 356 } else { 357 // Fast path: Verifier already would've called ResolveFieldJLS and we wouldn't 358 // be executing here if there was a static/non-static mismatch. 359 resolved_field = class_linker->ResolveField(field_idx, referrer, is_static); 360 } 361 362 if (UNLIKELY(resolved_field == nullptr)) { 363 DCHECK(self->IsExceptionPending()); // Throw exception and unwind. 364 return nullptr; // Failure. 365 } 366 ObjPtr<mirror::Class> fields_class = resolved_field->GetDeclaringClass(); 367 if (access_check) { 368 if (UNLIKELY(resolved_field->IsStatic() != is_static)) { 369 ThrowIncompatibleClassChangeErrorField(resolved_field, is_static, referrer); 370 return nullptr; 371 } 372 mirror::Class* referring_class = referrer->GetDeclaringClass(); 373 if (UNLIKELY(!referring_class->CheckResolvedFieldAccess(fields_class, 374 resolved_field, 375 referrer->GetDexCache(), 376 field_idx))) { 377 DCHECK(self->IsExceptionPending()); // Throw exception and unwind. 378 return nullptr; // Failure. 379 } 380 if (UNLIKELY(is_set && resolved_field->IsFinal() && (fields_class != referring_class))) { 381 ThrowIllegalAccessErrorFinalField(referrer, resolved_field); 382 return nullptr; // Failure. 383 } else { 384 if (UNLIKELY(resolved_field->IsPrimitiveType() != is_primitive || 385 resolved_field->FieldSize() != expected_size)) { 386 self->ThrowNewExceptionF("Ljava/lang/NoSuchFieldError;", 387 "Attempted read of %zd-bit %s on field '%s'", 388 expected_size * (32 / sizeof(int32_t)), 389 is_primitive ? "primitive" : "non-primitive", 390 resolved_field->PrettyField(true).c_str()); 391 return nullptr; // Failure. 392 } 393 } 394 } 395 if (!is_static) { 396 // instance fields must be being accessed on an initialized class 397 return resolved_field; 398 } else { 399 // If the class is initialized we're done. 400 if (LIKELY(fields_class->IsInitialized())) { 401 return resolved_field; 402 } else { 403 StackHandleScope<1> hs(self); 404 if (LIKELY(class_linker->EnsureInitialized(self, hs.NewHandle(fields_class), true, true))) { 405 // Otherwise let's ensure the class is initialized before resolving the field. 406 return resolved_field; 407 } 408 DCHECK(self->IsExceptionPending()); // Throw exception and unwind 409 return nullptr; // Failure. 410 } 411 } 412 } 413 414 // Explicit template declarations of FindFieldFromCode for all field access types. 415 #define EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, _access_check) \ 416 template REQUIRES_SHARED(Locks::mutator_lock_) ALWAYS_INLINE \ 417 ArtField* FindFieldFromCode<_type, _access_check>(uint32_t field_idx, \ 418 ArtMethod* referrer, \ 419 Thread* self, size_t expected_size) \ 420 421 #define EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(_type) \ 422 EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, false); \ 423 EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, true) 424 425 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstanceObjectRead); 426 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstanceObjectWrite); 427 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstancePrimitiveRead); 428 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstancePrimitiveWrite); 429 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticObjectRead); 430 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticObjectWrite); 431 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticPrimitiveRead); 432 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticPrimitiveWrite); 433 434 #undef EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL 435 #undef EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL 436 437 template<InvokeType type, bool access_check> 438 inline ArtMethod* FindMethodFromCode(uint32_t method_idx, 439 ObjPtr<mirror::Object>* this_object, 440 ArtMethod* referrer, 441 Thread* self) { 442 ClassLinker* const class_linker = Runtime::Current()->GetClassLinker(); 443 constexpr ClassLinker::ResolveMode resolve_mode = 444 access_check ? ClassLinker::ResolveMode::kCheckICCEAndIAE 445 : ClassLinker::ResolveMode::kNoChecks; 446 ArtMethod* resolved_method; 447 if (type == kStatic) { 448 resolved_method = class_linker->ResolveMethod<resolve_mode>(self, method_idx, referrer, type); 449 } else { 450 StackHandleScope<1> hs(self); 451 HandleWrapperObjPtr<mirror::Object> h_this(hs.NewHandleWrapper(this_object)); 452 resolved_method = class_linker->ResolveMethod<resolve_mode>(self, method_idx, referrer, type); 453 } 454 if (UNLIKELY(resolved_method == nullptr)) { 455 DCHECK(self->IsExceptionPending()); // Throw exception and unwind. 456 return nullptr; // Failure. 457 } 458 // Next, null pointer check. 459 if (UNLIKELY(*this_object == nullptr && type != kStatic)) { 460 if (UNLIKELY(resolved_method->GetDeclaringClass()->IsStringClass() && 461 resolved_method->IsConstructor())) { 462 // Hack for String init: 463 // 464 // We assume that the input of String.<init> in verified code is always 465 // an unitialized reference. If it is a null constant, it must have been 466 // optimized out by the compiler. Do not throw NullPointerException. 467 } else { 468 // Maintain interpreter-like semantics where NullPointerException is thrown 469 // after potential NoSuchMethodError from class linker. 470 ThrowNullPointerExceptionForMethodAccess(method_idx, type); 471 return nullptr; // Failure. 472 } 473 } 474 switch (type) { 475 case kStatic: 476 case kDirect: 477 return resolved_method; 478 case kVirtual: { 479 ObjPtr<mirror::Class> klass = (*this_object)->GetClass(); 480 uint16_t vtable_index = resolved_method->GetMethodIndex(); 481 if (access_check && 482 (!klass->HasVTable() || 483 vtable_index >= static_cast<uint32_t>(klass->GetVTableLength()))) { 484 // Behavior to agree with that of the verifier. 485 ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), 486 resolved_method->GetName(), resolved_method->GetSignature()); 487 return nullptr; // Failure. 488 } 489 DCHECK(klass->HasVTable()) << klass->PrettyClass(); 490 return klass->GetVTableEntry(vtable_index, class_linker->GetImagePointerSize()); 491 } 492 case kSuper: { 493 // TODO This lookup is quite slow. 494 // NB This is actually quite tricky to do any other way. We cannot use GetDeclaringClass since 495 // that will actually not be what we want in some cases where there are miranda methods or 496 // defaults. What we actually need is a GetContainingClass that says which classes virtuals 497 // this method is coming from. 498 StackHandleScope<2> hs2(self); 499 HandleWrapperObjPtr<mirror::Object> h_this(hs2.NewHandleWrapper(this_object)); 500 Handle<mirror::Class> h_referring_class(hs2.NewHandle(referrer->GetDeclaringClass())); 501 const dex::TypeIndex method_type_idx = 502 referrer->GetDexFile()->GetMethodId(method_idx).class_idx_; 503 mirror::Class* method_reference_class = class_linker->ResolveType(method_type_idx, referrer); 504 if (UNLIKELY(method_reference_class == nullptr)) { 505 // Bad type idx. 506 CHECK(self->IsExceptionPending()); 507 return nullptr; 508 } else if (!method_reference_class->IsInterface()) { 509 // It is not an interface. If the referring class is in the class hierarchy of the 510 // referenced class in the bytecode, we use its super class. Otherwise, we throw 511 // a NoSuchMethodError. 512 ObjPtr<mirror::Class> super_class = nullptr; 513 if (method_reference_class->IsAssignableFrom(h_referring_class.Get())) { 514 super_class = h_referring_class->GetSuperClass(); 515 } 516 uint16_t vtable_index = resolved_method->GetMethodIndex(); 517 if (access_check) { 518 // Check existence of super class. 519 if (super_class == nullptr || 520 !super_class->HasVTable() || 521 vtable_index >= static_cast<uint32_t>(super_class->GetVTableLength())) { 522 // Behavior to agree with that of the verifier. 523 ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), 524 resolved_method->GetName(), resolved_method->GetSignature()); 525 return nullptr; // Failure. 526 } 527 } 528 DCHECK(super_class != nullptr); 529 DCHECK(super_class->HasVTable()); 530 return super_class->GetVTableEntry(vtable_index, class_linker->GetImagePointerSize()); 531 } else { 532 // It is an interface. 533 if (access_check) { 534 if (!method_reference_class->IsAssignableFrom(h_this->GetClass())) { 535 ThrowIncompatibleClassChangeErrorClassForInterfaceSuper(resolved_method, 536 method_reference_class, 537 h_this.Get(), 538 referrer); 539 return nullptr; // Failure. 540 } 541 } 542 // TODO We can do better than this for a (compiled) fastpath. 543 ArtMethod* result = method_reference_class->FindVirtualMethodForInterfaceSuper( 544 resolved_method, class_linker->GetImagePointerSize()); 545 // Throw an NSME if nullptr; 546 if (result == nullptr) { 547 ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), 548 resolved_method->GetName(), resolved_method->GetSignature()); 549 } 550 return result; 551 } 552 UNREACHABLE(); 553 } 554 case kInterface: { 555 uint32_t imt_index = ImTable::GetImtIndex(resolved_method); 556 PointerSize pointer_size = class_linker->GetImagePointerSize(); 557 ObjPtr<mirror::Class> klass = (*this_object)->GetClass(); 558 ArtMethod* imt_method = klass->GetImt(pointer_size)->Get(imt_index, pointer_size); 559 if (!imt_method->IsRuntimeMethod()) { 560 if (kIsDebugBuild) { 561 ArtMethod* method = klass->FindVirtualMethodForInterface( 562 resolved_method, class_linker->GetImagePointerSize()); 563 CHECK_EQ(imt_method, method) << ArtMethod::PrettyMethod(resolved_method) << " / " 564 << imt_method->PrettyMethod() << " / " 565 << ArtMethod::PrettyMethod(method) << " / " 566 << klass->PrettyClass(); 567 } 568 return imt_method; 569 } else { 570 ArtMethod* interface_method = klass->FindVirtualMethodForInterface( 571 resolved_method, class_linker->GetImagePointerSize()); 572 if (UNLIKELY(interface_method == nullptr)) { 573 ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(resolved_method, 574 *this_object, referrer); 575 return nullptr; // Failure. 576 } 577 return interface_method; 578 } 579 } 580 default: 581 LOG(FATAL) << "Unknown invoke type " << type; 582 return nullptr; // Failure. 583 } 584 } 585 586 // Explicit template declarations of FindMethodFromCode for all invoke types. 587 #define EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, _access_check) \ 588 template REQUIRES_SHARED(Locks::mutator_lock_) ALWAYS_INLINE \ 589 ArtMethod* FindMethodFromCode<_type, _access_check>(uint32_t method_idx, \ 590 ObjPtr<mirror::Object>* this_object, \ 591 ArtMethod* referrer, \ 592 Thread* self) 593 #define EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(_type) \ 594 EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, false); \ 595 EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, true) 596 597 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kStatic); 598 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kDirect); 599 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kVirtual); 600 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kSuper); 601 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kInterface); 602 603 #undef EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL 604 #undef EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL 605 606 // Fast path field resolution that can't initialize classes or throw exceptions. 607 inline ArtField* FindFieldFast(uint32_t field_idx, ArtMethod* referrer, FindFieldType type, 608 size_t expected_size) { 609 ScopedAssertNoThreadSuspension ants(__FUNCTION__); 610 ArtField* resolved_field = 611 referrer->GetDexCache()->GetResolvedField(field_idx, kRuntimePointerSize); 612 if (UNLIKELY(resolved_field == nullptr)) { 613 return nullptr; 614 } 615 // Check for incompatible class change. 616 bool is_primitive; 617 bool is_set; 618 bool is_static; 619 switch (type) { 620 case InstanceObjectRead: is_primitive = false; is_set = false; is_static = false; break; 621 case InstanceObjectWrite: is_primitive = false; is_set = true; is_static = false; break; 622 case InstancePrimitiveRead: is_primitive = true; is_set = false; is_static = false; break; 623 case InstancePrimitiveWrite: is_primitive = true; is_set = true; is_static = false; break; 624 case StaticObjectRead: is_primitive = false; is_set = false; is_static = true; break; 625 case StaticObjectWrite: is_primitive = false; is_set = true; is_static = true; break; 626 case StaticPrimitiveRead: is_primitive = true; is_set = false; is_static = true; break; 627 case StaticPrimitiveWrite: is_primitive = true; is_set = true; is_static = true; break; 628 default: 629 LOG(FATAL) << "UNREACHABLE"; 630 UNREACHABLE(); 631 } 632 if (UNLIKELY(resolved_field->IsStatic() != is_static)) { 633 // Incompatible class change. 634 return nullptr; 635 } 636 ObjPtr<mirror::Class> fields_class = resolved_field->GetDeclaringClass(); 637 if (is_static) { 638 // Check class is initialized else fail so that we can contend to initialize the class with 639 // other threads that may be racing to do this. 640 if (UNLIKELY(!fields_class->IsInitialized())) { 641 return nullptr; 642 } 643 } 644 ObjPtr<mirror::Class> referring_class = referrer->GetDeclaringClass(); 645 if (UNLIKELY(!referring_class->CanAccess(fields_class) || 646 !referring_class->CanAccessMember(fields_class, resolved_field->GetAccessFlags()) || 647 (is_set && resolved_field->IsFinal() && (fields_class != referring_class)))) { 648 // Illegal access. 649 return nullptr; 650 } 651 if (UNLIKELY(resolved_field->IsPrimitiveType() != is_primitive || 652 resolved_field->FieldSize() != expected_size)) { 653 return nullptr; 654 } 655 return resolved_field; 656 } 657 658 // Fast path method resolution that can't throw exceptions. 659 template <InvokeType type, bool access_check> 660 inline ArtMethod* FindMethodFast(uint32_t method_idx, 661 ObjPtr<mirror::Object> this_object, 662 ArtMethod* referrer) { 663 ScopedAssertNoThreadSuspension ants(__FUNCTION__); 664 if (UNLIKELY(this_object == nullptr && type != kStatic)) { 665 return nullptr; 666 } 667 ObjPtr<mirror::Class> referring_class = referrer->GetDeclaringClass(); 668 ObjPtr<mirror::DexCache> dex_cache = referrer->GetDexCache(); 669 constexpr ClassLinker::ResolveMode resolve_mode = access_check 670 ? ClassLinker::ResolveMode::kCheckICCEAndIAE 671 : ClassLinker::ResolveMode::kNoChecks; 672 ClassLinker* linker = Runtime::Current()->GetClassLinker(); 673 ArtMethod* resolved_method = linker->GetResolvedMethod<type, resolve_mode>(method_idx, referrer); 674 if (UNLIKELY(resolved_method == nullptr)) { 675 return nullptr; 676 } 677 if (type == kInterface) { // Most common form of slow path dispatch. 678 return this_object->GetClass()->FindVirtualMethodForInterface(resolved_method, 679 kRuntimePointerSize); 680 } else if (type == kStatic || type == kDirect) { 681 return resolved_method; 682 } else if (type == kSuper) { 683 // TODO This lookup is rather slow. 684 dex::TypeIndex method_type_idx = dex_cache->GetDexFile()->GetMethodId(method_idx).class_idx_; 685 ObjPtr<mirror::Class> method_reference_class = ClassLinker::LookupResolvedType( 686 method_type_idx, dex_cache, referrer->GetClassLoader()); 687 if (method_reference_class == nullptr) { 688 // Need to do full type resolution... 689 return nullptr; 690 } else if (!method_reference_class->IsInterface()) { 691 // It is not an interface. If the referring class is in the class hierarchy of the 692 // referenced class in the bytecode, we use its super class. Otherwise, we cannot 693 // resolve the method. 694 if (!method_reference_class->IsAssignableFrom(referring_class)) { 695 return nullptr; 696 } 697 ObjPtr<mirror::Class> super_class = referring_class->GetSuperClass(); 698 if (resolved_method->GetMethodIndex() >= super_class->GetVTableLength()) { 699 // The super class does not have the method. 700 return nullptr; 701 } 702 return super_class->GetVTableEntry(resolved_method->GetMethodIndex(), kRuntimePointerSize); 703 } else { 704 return method_reference_class->FindVirtualMethodForInterfaceSuper( 705 resolved_method, kRuntimePointerSize); 706 } 707 } else { 708 DCHECK(type == kVirtual); 709 return this_object->GetClass()->GetVTableEntry( 710 resolved_method->GetMethodIndex(), kRuntimePointerSize); 711 } 712 } 713 714 inline mirror::Class* ResolveVerifyAndClinit(dex::TypeIndex type_idx, 715 ArtMethod* referrer, 716 Thread* self, 717 bool can_run_clinit, 718 bool verify_access) { 719 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 720 mirror::Class* klass = class_linker->ResolveType(type_idx, referrer); 721 if (UNLIKELY(klass == nullptr)) { 722 CHECK(self->IsExceptionPending()); 723 return nullptr; // Failure - Indicate to caller to deliver exception 724 } 725 // Perform access check if necessary. 726 mirror::Class* referring_class = referrer->GetDeclaringClass(); 727 if (verify_access && UNLIKELY(!referring_class->CanAccess(klass))) { 728 ThrowIllegalAccessErrorClass(referring_class, klass); 729 return nullptr; // Failure - Indicate to caller to deliver exception 730 } 731 // If we're just implementing const-class, we shouldn't call <clinit>. 732 if (!can_run_clinit) { 733 return klass; 734 } 735 // If we are the <clinit> of this class, just return our storage. 736 // 737 // Do not set the DexCache InitializedStaticStorage, since that implies <clinit> has finished 738 // running. 739 if (klass == referring_class && referrer->IsConstructor() && referrer->IsStatic()) { 740 return klass; 741 } 742 StackHandleScope<1> hs(self); 743 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 744 if (!class_linker->EnsureInitialized(self, h_class, true, true)) { 745 CHECK(self->IsExceptionPending()); 746 return nullptr; // Failure - Indicate to caller to deliver exception 747 } 748 return h_class.Get(); 749 } 750 751 static inline mirror::String* ResolveString(ClassLinker* class_linker, 752 dex::StringIndex string_idx, 753 ArtMethod* referrer) 754 REQUIRES_SHARED(Locks::mutator_lock_) { 755 Thread::PoisonObjectPointersIfDebug(); 756 ObjPtr<mirror::String> string = referrer->GetDexCache()->GetResolvedString(string_idx); 757 if (UNLIKELY(string == nullptr)) { 758 StackHandleScope<1> hs(Thread::Current()); 759 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 760 const DexFile& dex_file = *dex_cache->GetDexFile(); 761 string = class_linker->ResolveString(dex_file, string_idx, dex_cache); 762 } 763 return string.Ptr(); 764 } 765 766 inline mirror::String* ResolveStringFromCode(ArtMethod* referrer, dex::StringIndex string_idx) { 767 Thread::PoisonObjectPointersIfDebug(); 768 ObjPtr<mirror::String> string = referrer->GetDexCache()->GetResolvedString(string_idx); 769 if (UNLIKELY(string == nullptr)) { 770 StackHandleScope<1> hs(Thread::Current()); 771 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 772 const DexFile& dex_file = *dex_cache->GetDexFile(); 773 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 774 string = class_linker->ResolveString(dex_file, string_idx, dex_cache); 775 } 776 return string.Ptr(); 777 } 778 779 inline void UnlockJniSynchronizedMethod(jobject locked, Thread* self) { 780 // Save any pending exception over monitor exit call. 781 mirror::Throwable* saved_exception = nullptr; 782 if (UNLIKELY(self->IsExceptionPending())) { 783 saved_exception = self->GetException(); 784 self->ClearException(); 785 } 786 // Decode locked object and unlock, before popping local references. 787 self->DecodeJObject(locked)->MonitorExit(self); 788 if (UNLIKELY(self->IsExceptionPending())) { 789 LOG(FATAL) << "Synchronized JNI code returning with an exception:\n" 790 << saved_exception->Dump() 791 << "\nEncountered second exception during implicit MonitorExit:\n" 792 << self->GetException()->Dump(); 793 } 794 // Restore pending exception. 795 if (saved_exception != nullptr) { 796 self->SetException(saved_exception); 797 } 798 } 799 800 template <typename INT_TYPE, typename FLOAT_TYPE> 801 inline INT_TYPE art_float_to_integral(FLOAT_TYPE f) { 802 const INT_TYPE kMaxInt = static_cast<INT_TYPE>(std::numeric_limits<INT_TYPE>::max()); 803 const INT_TYPE kMinInt = static_cast<INT_TYPE>(std::numeric_limits<INT_TYPE>::min()); 804 const FLOAT_TYPE kMaxIntAsFloat = static_cast<FLOAT_TYPE>(kMaxInt); 805 const FLOAT_TYPE kMinIntAsFloat = static_cast<FLOAT_TYPE>(kMinInt); 806 if (LIKELY(f > kMinIntAsFloat)) { 807 if (LIKELY(f < kMaxIntAsFloat)) { 808 return static_cast<INT_TYPE>(f); 809 } else { 810 return kMaxInt; 811 } 812 } else { 813 return (f != f) ? 0 : kMinInt; // f != f implies NaN 814 } 815 } 816 817 } // namespace art 818 819 #endif // ART_RUNTIME_ENTRYPOINTS_ENTRYPOINT_UTILS_INL_H_ 820
