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