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 // This method is being used by artQuickResolutionTrampoline, before it sets up 54 // the passed parameters in a GC friendly way. Therefore we must never be 55 // suspended while executing it. 56 ScopedAssertNoThreadSuspension sants(__FUNCTION__); 57 58 if (inline_info.EncodesArtMethodAtDepth(encoding, inlining_depth)) { 59 return inline_info.GetArtMethodAtDepth(encoding, inlining_depth); 60 } 61 62 uint32_t method_index = inline_info.GetMethodIndexAtDepth(encoding, method_info, inlining_depth); 63 if (inline_info.GetDexPcAtDepth(encoding, inlining_depth) == static_cast<uint32_t>(-1)) { 64 // "charAt" special case. It is the only non-leaf method we inline across dex files. 65 ArtMethod* inlined_method = jni::DecodeArtMethod(WellKnownClasses::java_lang_String_charAt); 66 DCHECK_EQ(inlined_method->GetDexMethodIndex(), method_index); 67 return inlined_method; 68 } 69 70 // Find which method did the call in the inlining hierarchy. 71 ArtMethod* caller = outer_method; 72 if (inlining_depth != 0) { 73 caller = GetResolvedMethod(outer_method, 74 method_info, 75 inline_info, 76 encoding, 77 inlining_depth - 1); 78 } 79 80 // Lookup the declaring class of the inlined method. 81 const DexFile* dex_file = caller->GetDexFile(); 82 const DexFile::MethodId& method_id = dex_file->GetMethodId(method_index); 83 ArtMethod* inlined_method = caller->GetDexCacheResolvedMethod(method_index, kRuntimePointerSize); 84 if (inlined_method != nullptr && !inlined_method->IsRuntimeMethod()) { 85 return inlined_method; 86 } 87 const char* descriptor = dex_file->StringByTypeIdx(method_id.class_idx_); 88 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 89 Thread* self = Thread::Current(); 90 mirror::ClassLoader* class_loader = caller->GetDeclaringClass()->GetClassLoader(); 91 mirror::Class* klass = class_linker->LookupClass(self, descriptor, class_loader); 92 if (klass == nullptr) { 93 LOG(FATAL) << "Could not find an inlined method from an .oat file: " 94 << "the class " << descriptor << " was not found in the class loader of " 95 << caller->PrettyMethod() << ". " 96 << "This must be due to playing wrongly with class loaders"; 97 } 98 99 // Lookup the method. 100 const char* method_name = dex_file->GetMethodName(method_id); 101 const Signature signature = dex_file->GetMethodSignature(method_id); 102 103 inlined_method = klass->FindDeclaredDirectMethod(method_name, signature, kRuntimePointerSize); 104 if (inlined_method == nullptr) { 105 inlined_method = klass->FindDeclaredVirtualMethod(method_name, signature, kRuntimePointerSize); 106 if (inlined_method == nullptr) { 107 LOG(FATAL) << "Could not find an inlined method from an .oat file: " 108 << "the class " << descriptor << " does not have " 109 << method_name << signature << " declared. " 110 << "This must be due to duplicate classes or playing wrongly with class loaders"; 111 } 112 } 113 caller->SetDexCacheResolvedMethod(method_index, inlined_method, kRuntimePointerSize); 114 115 return inlined_method; 116 } 117 118 ALWAYS_INLINE inline mirror::Class* CheckObjectAlloc(mirror::Class* klass, 119 Thread* self, 120 bool* slow_path) 121 REQUIRES_SHARED(Locks::mutator_lock_) 122 REQUIRES(!Roles::uninterruptible_) { 123 if (UNLIKELY(!klass->IsInstantiable())) { 124 self->ThrowNewException("Ljava/lang/InstantiationError;", klass->PrettyDescriptor().c_str()); 125 *slow_path = true; 126 return nullptr; // Failure 127 } 128 if (UNLIKELY(klass->IsClassClass())) { 129 ThrowIllegalAccessError(nullptr, "Class %s is inaccessible", 130 klass->PrettyDescriptor().c_str()); 131 *slow_path = true; 132 return nullptr; // Failure 133 } 134 if (UNLIKELY(!klass->IsInitialized())) { 135 StackHandleScope<1> hs(self); 136 Handle<mirror::Class> h_klass(hs.NewHandle(klass)); 137 // EnsureInitialized (the class initializer) might cause a GC. 138 // may cause us to suspend meaning that another thread may try to 139 // change the allocator while we are stuck in the entrypoints of 140 // an old allocator. Also, the class initialization may fail. To 141 // handle these cases we mark the slow path boolean as true so 142 // that the caller knows to check the allocator type to see if it 143 // has changed and to null-check the return value in case the 144 // initialization fails. 145 *slow_path = true; 146 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_klass, true, true)) { 147 DCHECK(self->IsExceptionPending()); 148 return nullptr; // Failure 149 } else { 150 DCHECK(!self->IsExceptionPending()); 151 } 152 return h_klass.Get(); 153 } 154 return klass; 155 } 156 157 ALWAYS_INLINE 158 inline mirror::Class* CheckClassInitializedForObjectAlloc(mirror::Class* klass, 159 Thread* self, 160 bool* slow_path) 161 REQUIRES_SHARED(Locks::mutator_lock_) 162 REQUIRES(!Roles::uninterruptible_) { 163 if (UNLIKELY(!klass->IsInitialized())) { 164 StackHandleScope<1> hs(self); 165 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 166 // EnsureInitialized (the class initializer) might cause a GC. 167 // may cause us to suspend meaning that another thread may try to 168 // change the allocator while we are stuck in the entrypoints of 169 // an old allocator. Also, the class initialization may fail. To 170 // handle these cases we mark the slow path boolean as true so 171 // that the caller knows to check the allocator type to see if it 172 // has changed and to null-check the return value in case the 173 // initialization fails. 174 *slow_path = true; 175 if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) { 176 DCHECK(self->IsExceptionPending()); 177 return nullptr; // Failure 178 } 179 return h_class.Get(); 180 } 181 return klass; 182 } 183 184 // Allocate an instance of klass. Throws InstantationError if klass is not instantiable, 185 // or IllegalAccessError if klass is j.l.Class. Performs a clinit check too. 186 template <bool kInstrumented> 187 ALWAYS_INLINE 188 inline mirror::Object* AllocObjectFromCode(mirror::Class* klass, 189 Thread* self, 190 gc::AllocatorType allocator_type) { 191 bool slow_path = false; 192 klass = CheckObjectAlloc(klass, self, &slow_path); 193 if (UNLIKELY(slow_path)) { 194 if (klass == nullptr) { 195 return nullptr; 196 } 197 // CheckObjectAlloc can cause thread suspension which means we may now be instrumented. 198 return klass->Alloc</*kInstrumented*/true>( 199 self, 200 Runtime::Current()->GetHeap()->GetCurrentAllocator()).Ptr(); 201 } 202 DCHECK(klass != nullptr); 203 return klass->Alloc<kInstrumented>(self, allocator_type).Ptr(); 204 } 205 206 // Given the context of a calling Method and a resolved class, create an instance. 207 template <bool kInstrumented> 208 ALWAYS_INLINE 209 inline mirror::Object* AllocObjectFromCodeResolved(mirror::Class* klass, 210 Thread* self, 211 gc::AllocatorType allocator_type) { 212 DCHECK(klass != nullptr); 213 bool slow_path = false; 214 klass = CheckClassInitializedForObjectAlloc(klass, self, &slow_path); 215 if (UNLIKELY(slow_path)) { 216 if (klass == nullptr) { 217 return nullptr; 218 } 219 gc::Heap* heap = Runtime::Current()->GetHeap(); 220 // Pass in false since the object cannot be finalizable. 221 // CheckClassInitializedForObjectAlloc can cause thread suspension which means we may now be 222 // instrumented. 223 return klass->Alloc</*kInstrumented*/true, false>(self, heap->GetCurrentAllocator()).Ptr(); 224 } 225 // Pass in false since the object cannot be finalizable. 226 return klass->Alloc<kInstrumented, false>(self, allocator_type).Ptr(); 227 } 228 229 // Given the context of a calling Method and an initialized class, create an instance. 230 template <bool kInstrumented> 231 ALWAYS_INLINE 232 inline mirror::Object* AllocObjectFromCodeInitialized(mirror::Class* klass, 233 Thread* self, 234 gc::AllocatorType allocator_type) { 235 DCHECK(klass != nullptr); 236 // Pass in false since the object cannot be finalizable. 237 return klass->Alloc<kInstrumented, false>(self, allocator_type).Ptr(); 238 } 239 240 241 template <bool kAccessCheck> 242 ALWAYS_INLINE 243 inline mirror::Class* CheckArrayAlloc(dex::TypeIndex type_idx, 244 int32_t component_count, 245 ArtMethod* method, 246 bool* slow_path) { 247 if (UNLIKELY(component_count < 0)) { 248 ThrowNegativeArraySizeException(component_count); 249 *slow_path = true; 250 return nullptr; // Failure 251 } 252 mirror::Class* klass = method->GetDexCache()->GetResolvedType(type_idx); 253 if (UNLIKELY(klass == nullptr)) { // Not in dex cache so try to resolve 254 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 255 klass = class_linker->ResolveType(type_idx, method); 256 *slow_path = true; 257 if (klass == nullptr) { // Error 258 DCHECK(Thread::Current()->IsExceptionPending()); 259 return nullptr; // Failure 260 } 261 CHECK(klass->IsArrayClass()) << klass->PrettyClass(); 262 } 263 if (kAccessCheck) { 264 mirror::Class* referrer = method->GetDeclaringClass(); 265 if (UNLIKELY(!referrer->CanAccess(klass))) { 266 ThrowIllegalAccessErrorClass(referrer, klass); 267 *slow_path = true; 268 return nullptr; // Failure 269 } 270 } 271 return klass; 272 } 273 274 // Given the context of a calling Method, use its DexCache to resolve a type to an array Class. If 275 // it cannot be resolved, throw an error. If it can, use it to create an array. 276 // When verification/compiler hasn't been able to verify access, optionally perform an access 277 // check. 278 template <bool kAccessCheck, bool kInstrumented> 279 ALWAYS_INLINE 280 inline mirror::Array* AllocArrayFromCode(dex::TypeIndex type_idx, 281 int32_t component_count, 282 ArtMethod* method, 283 Thread* self, 284 gc::AllocatorType allocator_type) { 285 bool slow_path = false; 286 mirror::Class* klass = CheckArrayAlloc<kAccessCheck>(type_idx, component_count, method, 287 &slow_path); 288 if (UNLIKELY(slow_path)) { 289 if (klass == nullptr) { 290 return nullptr; 291 } 292 gc::Heap* heap = Runtime::Current()->GetHeap(); 293 // CheckArrayAlloc can cause thread suspension which means we may now be instrumented. 294 return mirror::Array::Alloc</*kInstrumented*/true>(self, 295 klass, 296 component_count, 297 klass->GetComponentSizeShift(), 298 heap->GetCurrentAllocator()); 299 } 300 return mirror::Array::Alloc<kInstrumented>(self, klass, component_count, 301 klass->GetComponentSizeShift(), allocator_type); 302 } 303 304 template <bool kInstrumented> 305 ALWAYS_INLINE 306 inline mirror::Array* AllocArrayFromCodeResolved(mirror::Class* klass, 307 int32_t component_count, 308 Thread* self, 309 gc::AllocatorType allocator_type) { 310 DCHECK(klass != nullptr); 311 if (UNLIKELY(component_count < 0)) { 312 ThrowNegativeArraySizeException(component_count); 313 return nullptr; // Failure 314 } 315 // No need to retry a slow-path allocation as the above code won't cause a GC or thread 316 // suspension. 317 return mirror::Array::Alloc<kInstrumented>(self, klass, component_count, 318 klass->GetComponentSizeShift(), allocator_type); 319 } 320 321 template<FindFieldType type, bool access_check> 322 inline ArtField* FindFieldFromCode(uint32_t field_idx, 323 ArtMethod* referrer, 324 Thread* self, 325 size_t expected_size) { 326 bool is_primitive; 327 bool is_set; 328 bool is_static; 329 switch (type) { 330 case InstanceObjectRead: is_primitive = false; is_set = false; is_static = false; break; 331 case InstanceObjectWrite: is_primitive = false; is_set = true; is_static = false; break; 332 case InstancePrimitiveRead: is_primitive = true; is_set = false; is_static = false; break; 333 case InstancePrimitiveWrite: is_primitive = true; is_set = true; is_static = false; break; 334 case StaticObjectRead: is_primitive = false; is_set = false; is_static = true; break; 335 case StaticObjectWrite: is_primitive = false; is_set = true; is_static = true; break; 336 case StaticPrimitiveRead: is_primitive = true; is_set = false; is_static = true; break; 337 case StaticPrimitiveWrite: // Keep GCC happy by having a default handler, fall-through. 338 default: is_primitive = true; is_set = true; is_static = true; break; 339 } 340 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 341 342 ArtField* resolved_field; 343 if (access_check) { 344 // Slow path: According to JLS 13.4.8, a linkage error may occur if a compile-time 345 // qualifying type of a field and the resolved run-time qualifying type of a field differed 346 // in their static-ness. 347 // 348 // In particular, don't assume the dex instruction already correctly knows if the 349 // real field is static or not. The resolution must not be aware of this. 350 ArtMethod* method = referrer->GetInterfaceMethodIfProxy(kRuntimePointerSize); 351 352 StackHandleScope<2> hs(self); 353 Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(method->GetDexCache())); 354 Handle<mirror::ClassLoader> h_class_loader(hs.NewHandle(method->GetClassLoader())); 355 356 resolved_field = class_linker->ResolveFieldJLS(*method->GetDexFile(), 357 field_idx, 358 h_dex_cache, 359 h_class_loader); 360 } else { 361 // Fast path: Verifier already would've called ResolveFieldJLS and we wouldn't 362 // be executing here if there was a static/non-static mismatch. 363 resolved_field = class_linker->ResolveField(field_idx, referrer, is_static); 364 } 365 366 if (UNLIKELY(resolved_field == nullptr)) { 367 DCHECK(self->IsExceptionPending()); // Throw exception and unwind. 368 return nullptr; // Failure. 369 } 370 ObjPtr<mirror::Class> fields_class = resolved_field->GetDeclaringClass(); 371 if (access_check) { 372 if (UNLIKELY(resolved_field->IsStatic() != is_static)) { 373 ThrowIncompatibleClassChangeErrorField(resolved_field, is_static, referrer); 374 return nullptr; 375 } 376 mirror::Class* referring_class = referrer->GetDeclaringClass(); 377 if (UNLIKELY(!referring_class->CheckResolvedFieldAccess(fields_class, 378 resolved_field, 379 field_idx))) { 380 DCHECK(self->IsExceptionPending()); // Throw exception and unwind. 381 return nullptr; // Failure. 382 } 383 if (UNLIKELY(is_set && resolved_field->IsFinal() && (fields_class != referring_class))) { 384 ThrowIllegalAccessErrorFinalField(referrer, resolved_field); 385 return nullptr; // Failure. 386 } else { 387 if (UNLIKELY(resolved_field->IsPrimitiveType() != is_primitive || 388 resolved_field->FieldSize() != expected_size)) { 389 self->ThrowNewExceptionF("Ljava/lang/NoSuchFieldError;", 390 "Attempted read of %zd-bit %s on field '%s'", 391 expected_size * (32 / sizeof(int32_t)), 392 is_primitive ? "primitive" : "non-primitive", 393 resolved_field->PrettyField(true).c_str()); 394 return nullptr; // Failure. 395 } 396 } 397 } 398 if (!is_static) { 399 // instance fields must be being accessed on an initialized class 400 return resolved_field; 401 } else { 402 // If the class is initialized we're done. 403 if (LIKELY(fields_class->IsInitialized())) { 404 return resolved_field; 405 } else { 406 StackHandleScope<1> hs(self); 407 if (LIKELY(class_linker->EnsureInitialized(self, hs.NewHandle(fields_class), true, true))) { 408 // Otherwise let's ensure the class is initialized before resolving the field. 409 return resolved_field; 410 } 411 DCHECK(self->IsExceptionPending()); // Throw exception and unwind 412 return nullptr; // Failure. 413 } 414 } 415 } 416 417 // Explicit template declarations of FindFieldFromCode for all field access types. 418 #define EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, _access_check) \ 419 template REQUIRES_SHARED(Locks::mutator_lock_) ALWAYS_INLINE \ 420 ArtField* FindFieldFromCode<_type, _access_check>(uint32_t field_idx, \ 421 ArtMethod* referrer, \ 422 Thread* self, size_t expected_size) \ 423 424 #define EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(_type) \ 425 EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, false); \ 426 EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL(_type, true) 427 428 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstanceObjectRead); 429 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstanceObjectWrite); 430 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstancePrimitiveRead); 431 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(InstancePrimitiveWrite); 432 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticObjectRead); 433 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticObjectWrite); 434 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticPrimitiveRead); 435 EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL(StaticPrimitiveWrite); 436 437 #undef EXPLICIT_FIND_FIELD_FROM_CODE_TYPED_TEMPLATE_DECL 438 #undef EXPLICIT_FIND_FIELD_FROM_CODE_TEMPLATE_DECL 439 440 template<InvokeType type, bool access_check> 441 inline ArtMethod* FindMethodFromCode(uint32_t method_idx, 442 ObjPtr<mirror::Object>* this_object, 443 ArtMethod* referrer, 444 Thread* self) { 445 ClassLinker* const class_linker = Runtime::Current()->GetClassLinker(); 446 ArtMethod* resolved_method = class_linker->GetResolvedMethod(method_idx, referrer); 447 if (resolved_method == nullptr) { 448 StackHandleScope<1> hs(self); 449 ObjPtr<mirror::Object> null_this = nullptr; 450 HandleWrapperObjPtr<mirror::Object> h_this( 451 hs.NewHandleWrapper(type == kStatic ? &null_this : this_object)); 452 constexpr ClassLinker::ResolveMode resolve_mode = 453 access_check ? ClassLinker::kForceICCECheck 454 : ClassLinker::kNoICCECheckForCache; 455 resolved_method = class_linker->ResolveMethod<resolve_mode>(self, method_idx, referrer, type); 456 } 457 // Resolution and access check. 458 if (UNLIKELY(resolved_method == nullptr)) { 459 DCHECK(self->IsExceptionPending()); // Throw exception and unwind. 460 return nullptr; // Failure. 461 } else if (access_check) { 462 mirror::Class* methods_class = resolved_method->GetDeclaringClass(); 463 bool can_access_resolved_method = 464 referrer->GetDeclaringClass()->CheckResolvedMethodAccess<type>(methods_class, 465 resolved_method, 466 method_idx); 467 if (UNLIKELY(!can_access_resolved_method)) { 468 DCHECK(self->IsExceptionPending()); // Throw exception and unwind. 469 return nullptr; // Failure. 470 } 471 // Incompatible class change should have been handled in resolve method. 472 if (UNLIKELY(resolved_method->CheckIncompatibleClassChange(type))) { 473 ThrowIncompatibleClassChangeError(type, resolved_method->GetInvokeType(), resolved_method, 474 referrer); 475 return nullptr; // Failure. 476 } 477 } 478 // Next, null pointer check. 479 if (UNLIKELY(*this_object == nullptr && type != kStatic)) { 480 if (UNLIKELY(resolved_method->GetDeclaringClass()->IsStringClass() && 481 resolved_method->IsConstructor())) { 482 // Hack for String init: 483 // 484 // We assume that the input of String.<init> in verified code is always 485 // an unitialized reference. If it is a null constant, it must have been 486 // optimized out by the compiler. Do not throw NullPointerException. 487 } else { 488 // Maintain interpreter-like semantics where NullPointerException is thrown 489 // after potential NoSuchMethodError from class linker. 490 ThrowNullPointerExceptionForMethodAccess(method_idx, type); 491 return nullptr; // Failure. 492 } 493 } 494 switch (type) { 495 case kStatic: 496 case kDirect: 497 return resolved_method; 498 case kVirtual: { 499 mirror::Class* klass = (*this_object)->GetClass(); 500 uint16_t vtable_index = resolved_method->GetMethodIndex(); 501 if (access_check && 502 (!klass->HasVTable() || 503 vtable_index >= static_cast<uint32_t>(klass->GetVTableLength()))) { 504 // Behavior to agree with that of the verifier. 505 ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), 506 resolved_method->GetName(), resolved_method->GetSignature()); 507 return nullptr; // Failure. 508 } 509 DCHECK(klass->HasVTable()) << klass->PrettyClass(); 510 return klass->GetVTableEntry(vtable_index, class_linker->GetImagePointerSize()); 511 } 512 case kSuper: { 513 // TODO This lookup is quite slow. 514 // NB This is actually quite tricky to do any other way. We cannot use GetDeclaringClass since 515 // that will actually not be what we want in some cases where there are miranda methods or 516 // defaults. What we actually need is a GetContainingClass that says which classes virtuals 517 // this method is coming from. 518 StackHandleScope<2> hs2(self); 519 HandleWrapperObjPtr<mirror::Object> h_this(hs2.NewHandleWrapper(this_object)); 520 Handle<mirror::Class> h_referring_class(hs2.NewHandle(referrer->GetDeclaringClass())); 521 const dex::TypeIndex method_type_idx = 522 referrer->GetDexFile()->GetMethodId(method_idx).class_idx_; 523 mirror::Class* method_reference_class = class_linker->ResolveType(method_type_idx, referrer); 524 if (UNLIKELY(method_reference_class == nullptr)) { 525 // Bad type idx. 526 CHECK(self->IsExceptionPending()); 527 return nullptr; 528 } else if (!method_reference_class->IsInterface()) { 529 // It is not an interface. If the referring class is in the class hierarchy of the 530 // referenced class in the bytecode, we use its super class. Otherwise, we throw 531 // a NoSuchMethodError. 532 mirror::Class* super_class = nullptr; 533 if (method_reference_class->IsAssignableFrom(h_referring_class.Get())) { 534 super_class = h_referring_class->GetSuperClass(); 535 } 536 uint16_t vtable_index = resolved_method->GetMethodIndex(); 537 if (access_check) { 538 // Check existence of super class. 539 if (super_class == nullptr || 540 !super_class->HasVTable() || 541 vtable_index >= static_cast<uint32_t>(super_class->GetVTableLength())) { 542 // Behavior to agree with that of the verifier. 543 ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), 544 resolved_method->GetName(), resolved_method->GetSignature()); 545 return nullptr; // Failure. 546 } 547 } 548 DCHECK(super_class != nullptr); 549 DCHECK(super_class->HasVTable()); 550 return super_class->GetVTableEntry(vtable_index, class_linker->GetImagePointerSize()); 551 } else { 552 // It is an interface. 553 if (access_check) { 554 if (!method_reference_class->IsAssignableFrom(h_this->GetClass())) { 555 ThrowIncompatibleClassChangeErrorClassForInterfaceSuper(resolved_method, 556 method_reference_class, 557 h_this.Get(), 558 referrer); 559 return nullptr; // Failure. 560 } 561 } 562 // TODO We can do better than this for a (compiled) fastpath. 563 ArtMethod* result = method_reference_class->FindVirtualMethodForInterfaceSuper( 564 resolved_method, class_linker->GetImagePointerSize()); 565 // Throw an NSME if nullptr; 566 if (result == nullptr) { 567 ThrowNoSuchMethodError(type, resolved_method->GetDeclaringClass(), 568 resolved_method->GetName(), resolved_method->GetSignature()); 569 } 570 return result; 571 } 572 UNREACHABLE(); 573 } 574 case kInterface: { 575 uint32_t imt_index = ImTable::GetImtIndex(resolved_method); 576 PointerSize pointer_size = class_linker->GetImagePointerSize(); 577 ArtMethod* imt_method = (*this_object)->GetClass()->GetImt(pointer_size)-> 578 Get(imt_index, pointer_size); 579 if (!imt_method->IsRuntimeMethod()) { 580 if (kIsDebugBuild) { 581 mirror::Class* klass = (*this_object)->GetClass(); 582 ArtMethod* method = klass->FindVirtualMethodForInterface( 583 resolved_method, class_linker->GetImagePointerSize()); 584 CHECK_EQ(imt_method, method) << ArtMethod::PrettyMethod(resolved_method) << " / " 585 << imt_method->PrettyMethod() << " / " 586 << ArtMethod::PrettyMethod(method) << " / " 587 << klass->PrettyClass(); 588 } 589 return imt_method; 590 } else { 591 ArtMethod* interface_method = (*this_object)->GetClass()->FindVirtualMethodForInterface( 592 resolved_method, class_linker->GetImagePointerSize()); 593 if (UNLIKELY(interface_method == nullptr)) { 594 ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(resolved_method, 595 *this_object, referrer); 596 return nullptr; // Failure. 597 } 598 return interface_method; 599 } 600 } 601 default: 602 LOG(FATAL) << "Unknown invoke type " << type; 603 return nullptr; // Failure. 604 } 605 } 606 607 // Explicit template declarations of FindMethodFromCode for all invoke types. 608 #define EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, _access_check) \ 609 template REQUIRES_SHARED(Locks::mutator_lock_) ALWAYS_INLINE \ 610 ArtMethod* FindMethodFromCode<_type, _access_check>(uint32_t method_idx, \ 611 ObjPtr<mirror::Object>* this_object, \ 612 ArtMethod* referrer, \ 613 Thread* self) 614 #define EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(_type) \ 615 EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, false); \ 616 EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL(_type, true) 617 618 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kStatic); 619 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kDirect); 620 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kVirtual); 621 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kSuper); 622 EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL(kInterface); 623 624 #undef EXPLICIT_FIND_METHOD_FROM_CODE_TYPED_TEMPLATE_DECL 625 #undef EXPLICIT_FIND_METHOD_FROM_CODE_TEMPLATE_DECL 626 627 // Fast path field resolution that can't initialize classes or throw exceptions. 628 inline ArtField* FindFieldFast(uint32_t field_idx, ArtMethod* referrer, FindFieldType type, 629 size_t expected_size) { 630 ScopedAssertNoThreadSuspension ants(__FUNCTION__); 631 ArtField* resolved_field = 632 referrer->GetDexCache()->GetResolvedField(field_idx, kRuntimePointerSize); 633 if (UNLIKELY(resolved_field == nullptr)) { 634 return nullptr; 635 } 636 // Check for incompatible class change. 637 bool is_primitive; 638 bool is_set; 639 bool is_static; 640 switch (type) { 641 case InstanceObjectRead: is_primitive = false; is_set = false; is_static = false; break; 642 case InstanceObjectWrite: is_primitive = false; is_set = true; is_static = false; break; 643 case InstancePrimitiveRead: is_primitive = true; is_set = false; is_static = false; break; 644 case InstancePrimitiveWrite: is_primitive = true; is_set = true; is_static = false; break; 645 case StaticObjectRead: is_primitive = false; is_set = false; is_static = true; break; 646 case StaticObjectWrite: is_primitive = false; is_set = true; is_static = true; break; 647 case StaticPrimitiveRead: is_primitive = true; is_set = false; is_static = true; break; 648 case StaticPrimitiveWrite: is_primitive = true; is_set = true; is_static = true; break; 649 default: 650 LOG(FATAL) << "UNREACHABLE"; 651 UNREACHABLE(); 652 } 653 if (UNLIKELY(resolved_field->IsStatic() != is_static)) { 654 // Incompatible class change. 655 return nullptr; 656 } 657 ObjPtr<mirror::Class> fields_class = resolved_field->GetDeclaringClass(); 658 if (is_static) { 659 // Check class is initialized else fail so that we can contend to initialize the class with 660 // other threads that may be racing to do this. 661 if (UNLIKELY(!fields_class->IsInitialized())) { 662 return nullptr; 663 } 664 } 665 mirror::Class* referring_class = referrer->GetDeclaringClass(); 666 if (UNLIKELY(!referring_class->CanAccess(fields_class) || 667 !referring_class->CanAccessMember(fields_class, resolved_field->GetAccessFlags()) || 668 (is_set && resolved_field->IsFinal() && (fields_class != referring_class)))) { 669 // Illegal access. 670 return nullptr; 671 } 672 if (UNLIKELY(resolved_field->IsPrimitiveType() != is_primitive || 673 resolved_field->FieldSize() != expected_size)) { 674 return nullptr; 675 } 676 return resolved_field; 677 } 678 679 // Fast path method resolution that can't throw exceptions. 680 inline ArtMethod* FindMethodFast(uint32_t method_idx, 681 ObjPtr<mirror::Object> this_object, 682 ArtMethod* referrer, 683 bool access_check, 684 InvokeType type) { 685 ScopedAssertNoThreadSuspension ants(__FUNCTION__); 686 if (UNLIKELY(this_object == nullptr && type != kStatic)) { 687 return nullptr; 688 } 689 mirror::Class* referring_class = referrer->GetDeclaringClass(); 690 ArtMethod* resolved_method = 691 referrer->GetDexCache()->GetResolvedMethod(method_idx, kRuntimePointerSize); 692 if (UNLIKELY(resolved_method == nullptr)) { 693 return nullptr; 694 } 695 if (access_check) { 696 // Check for incompatible class change errors and access. 697 bool icce = resolved_method->CheckIncompatibleClassChange(type); 698 if (UNLIKELY(icce)) { 699 return nullptr; 700 } 701 mirror::Class* methods_class = resolved_method->GetDeclaringClass(); 702 if (UNLIKELY(!referring_class->CanAccess(methods_class) || 703 !referring_class->CanAccessMember(methods_class, 704 resolved_method->GetAccessFlags()))) { 705 // Potential illegal access, may need to refine the method's class. 706 return nullptr; 707 } 708 } 709 if (type == kInterface) { // Most common form of slow path dispatch. 710 return this_object->GetClass()->FindVirtualMethodForInterface(resolved_method, 711 kRuntimePointerSize); 712 } else if (type == kStatic || type == kDirect) { 713 return resolved_method; 714 } else if (type == kSuper) { 715 // TODO This lookup is rather slow. 716 ObjPtr<mirror::DexCache> dex_cache = referrer->GetDexCache(); 717 dex::TypeIndex method_type_idx = dex_cache->GetDexFile()->GetMethodId(method_idx).class_idx_; 718 ObjPtr<mirror::Class> method_reference_class = ClassLinker::LookupResolvedType( 719 method_type_idx, dex_cache, referrer->GetClassLoader()); 720 if (method_reference_class == nullptr) { 721 // Need to do full type resolution... 722 return nullptr; 723 } else if (!method_reference_class->IsInterface()) { 724 // It is not an interface. If the referring class is in the class hierarchy of the 725 // referenced class in the bytecode, we use its super class. Otherwise, we cannot 726 // resolve the method. 727 if (!method_reference_class->IsAssignableFrom(referring_class)) { 728 return nullptr; 729 } 730 mirror::Class* super_class = referring_class->GetSuperClass(); 731 if (resolved_method->GetMethodIndex() >= super_class->GetVTableLength()) { 732 // The super class does not have the method. 733 return nullptr; 734 } 735 return super_class->GetVTableEntry(resolved_method->GetMethodIndex(), kRuntimePointerSize); 736 } else { 737 return method_reference_class->FindVirtualMethodForInterfaceSuper( 738 resolved_method, kRuntimePointerSize); 739 } 740 } else { 741 DCHECK(type == kVirtual); 742 return this_object->GetClass()->GetVTableEntry( 743 resolved_method->GetMethodIndex(), kRuntimePointerSize); 744 } 745 } 746 747 inline mirror::Class* ResolveVerifyAndClinit(dex::TypeIndex type_idx, 748 ArtMethod* referrer, 749 Thread* self, 750 bool can_run_clinit, 751 bool verify_access) { 752 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 753 mirror::Class* klass = class_linker->ResolveType(type_idx, referrer); 754 if (UNLIKELY(klass == nullptr)) { 755 CHECK(self->IsExceptionPending()); 756 return nullptr; // Failure - Indicate to caller to deliver exception 757 } 758 // Perform access check if necessary. 759 mirror::Class* referring_class = referrer->GetDeclaringClass(); 760 if (verify_access && UNLIKELY(!referring_class->CanAccess(klass))) { 761 ThrowIllegalAccessErrorClass(referring_class, klass); 762 return nullptr; // Failure - Indicate to caller to deliver exception 763 } 764 // If we're just implementing const-class, we shouldn't call <clinit>. 765 if (!can_run_clinit) { 766 return klass; 767 } 768 // If we are the <clinit> of this class, just return our storage. 769 // 770 // Do not set the DexCache InitializedStaticStorage, since that implies <clinit> has finished 771 // running. 772 if (klass == referring_class && referrer->IsConstructor() && referrer->IsStatic()) { 773 return klass; 774 } 775 StackHandleScope<1> hs(self); 776 Handle<mirror::Class> h_class(hs.NewHandle(klass)); 777 if (!class_linker->EnsureInitialized(self, h_class, true, true)) { 778 CHECK(self->IsExceptionPending()); 779 return nullptr; // Failure - Indicate to caller to deliver exception 780 } 781 return h_class.Get(); 782 } 783 784 static inline mirror::String* ResolveString(ClassLinker* class_linker, 785 dex::StringIndex string_idx, 786 ArtMethod* referrer) 787 REQUIRES_SHARED(Locks::mutator_lock_) { 788 Thread::PoisonObjectPointersIfDebug(); 789 ObjPtr<mirror::String> string = referrer->GetDexCache()->GetResolvedString(string_idx); 790 if (UNLIKELY(string == nullptr)) { 791 StackHandleScope<1> hs(Thread::Current()); 792 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 793 const DexFile& dex_file = *dex_cache->GetDexFile(); 794 string = class_linker->ResolveString(dex_file, string_idx, dex_cache); 795 } 796 return string.Ptr(); 797 } 798 799 inline mirror::String* ResolveStringFromCode(ArtMethod* referrer, dex::StringIndex string_idx) { 800 Thread::PoisonObjectPointersIfDebug(); 801 ObjPtr<mirror::String> string = referrer->GetDexCache()->GetResolvedString(string_idx); 802 if (UNLIKELY(string == nullptr)) { 803 StackHandleScope<1> hs(Thread::Current()); 804 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache())); 805 const DexFile& dex_file = *dex_cache->GetDexFile(); 806 ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); 807 string = class_linker->ResolveString(dex_file, string_idx, dex_cache); 808 } 809 return string.Ptr(); 810 } 811 812 inline void UnlockJniSynchronizedMethod(jobject locked, Thread* self) { 813 // Save any pending exception over monitor exit call. 814 mirror::Throwable* saved_exception = nullptr; 815 if (UNLIKELY(self->IsExceptionPending())) { 816 saved_exception = self->GetException(); 817 self->ClearException(); 818 } 819 // Decode locked object and unlock, before popping local references. 820 self->DecodeJObject(locked)->MonitorExit(self); 821 if (UNLIKELY(self->IsExceptionPending())) { 822 LOG(FATAL) << "Synchronized JNI code returning with an exception:\n" 823 << saved_exception->Dump() 824 << "\nEncountered second exception during implicit MonitorExit:\n" 825 << self->GetException()->Dump(); 826 } 827 // Restore pending exception. 828 if (saved_exception != nullptr) { 829 self->SetException(saved_exception); 830 } 831 } 832 833 template <typename INT_TYPE, typename FLOAT_TYPE> 834 inline INT_TYPE art_float_to_integral(FLOAT_TYPE f) { 835 const INT_TYPE kMaxInt = static_cast<INT_TYPE>(std::numeric_limits<INT_TYPE>::max()); 836 const INT_TYPE kMinInt = static_cast<INT_TYPE>(std::numeric_limits<INT_TYPE>::min()); 837 const FLOAT_TYPE kMaxIntAsFloat = static_cast<FLOAT_TYPE>(kMaxInt); 838 const FLOAT_TYPE kMinIntAsFloat = static_cast<FLOAT_TYPE>(kMinInt); 839 if (LIKELY(f > kMinIntAsFloat)) { 840 if (LIKELY(f < kMaxIntAsFloat)) { 841 return static_cast<INT_TYPE>(f); 842 } else { 843 return kMaxInt; 844 } 845 } else { 846 return (f != f) ? 0 : kMinInt; // f != f implies NaN 847 } 848 } 849 850 } // namespace art 851 852 #endif // ART_RUNTIME_ENTRYPOINTS_ENTRYPOINT_UTILS_INL_H_ 853
