runtime/art_method-inl.h - platform/art - Gitiles

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef ART_RUNTIME_ART_METHOD_INL_H_
 #define ART_RUNTIME_ART_METHOD_INL_H_

 #include "art_method.h"

 #include "art_field.h"
 #include "base/logging.h"
 #include "class_linker-inl.h"
 #include "common_throws.h"
 #include "dex_file.h"
 #include "dex_file-inl.h"
 #include "gc_root-inl.h"
 #include "jit/profiling_info.h"
 #include "mirror/class-inl.h"
 #include "mirror/dex_cache-inl.h"
 #include "mirror/object-inl.h"
 #include "mirror/object_array.h"
 #include "oat.h"
 #include "quick/quick_method_frame_info.h"
 #include "read_barrier-inl.h"
 #include "runtime-inl.h"
 #include "scoped_thread_state_change.h"
 #include "thread-inl.h"
 #include "utils.h"

 namespace art {

 template <ReadBarrierOption kReadBarrierOption>
 inline mirror::Class* ArtMethod::GetDeclaringClassUnchecked() {
   GcRootSource gc_root_source(this);
   return declaring_class_.Read<kReadBarrierOption>(&gc_root_source);
 }

 template <ReadBarrierOption kReadBarrierOption>
 inline mirror::Class* ArtMethod::GetDeclaringClass() {
   mirror::Class* result = GetDeclaringClassUnchecked<kReadBarrierOption>();
   if (kIsDebugBuild) {
     if (!IsRuntimeMethod()) {
       CHECK(result != nullptr) << this;
       CHECK(result->IsIdxLoaded() || result->IsErroneous())
           << result->GetStatus() << " " << PrettyClass(result);
     } else {
       CHECK(result == nullptr) << this;
     }
   }
   return result;
 }

 inline void ArtMethod::SetDeclaringClass(mirror::Class* new_declaring_class) {
   declaring_class_ = GcRoot<mirror::Class>(new_declaring_class);
 }

 inline bool ArtMethod::CASDeclaringClass(mirror::Class* expected_class,
                                          mirror::Class* desired_class) {
   GcRoot<mirror::Class> expected_root(expected_class);
   GcRoot<mirror::Class> desired_root(desired_class);
   return reinterpret_cast<Atomic<GcRoot<mirror::Class>>*>(&declaring_class_)->
       CompareExchangeStrongSequentiallyConsistent(
           expected_root, desired_root);
 }

 // AssertSharedHeld doesn't work in GetAccessFlags, so use a NO_THREAD_SAFETY_ANALYSIS helper.
 // TODO: Figure out why ASSERT_SHARED_CAPABILITY doesn't work.
 template <ReadBarrierOption kReadBarrierOption>
 ALWAYS_INLINE static inline void DoGetAccessFlagsHelper(ArtMethod* method)
     NO_THREAD_SAFETY_ANALYSIS {
   CHECK(method->IsRuntimeMethod() ||
         method->GetDeclaringClass<kReadBarrierOption>()->IsIdxLoaded() ||
         method->GetDeclaringClass<kReadBarrierOption>()->IsErroneous());
 }

 template <ReadBarrierOption kReadBarrierOption>
 inline uint32_t ArtMethod::GetAccessFlags() {
   if (kIsDebugBuild) {
     Thread* self = Thread::Current();
     if (!Locks::mutator_lock_->IsSharedHeld(self)) {
       ScopedObjectAccess soa(self);
       CHECK(IsRuntimeMethod() ||
             GetDeclaringClass<kReadBarrierOption>()->IsIdxLoaded() ||
             GetDeclaringClass<kReadBarrierOption>()->IsErroneous());
     } else {
       // We cannot use SOA in this case. We might be holding the lock, but may not be in the
       // runnable state (e.g., during GC).
       Locks::mutator_lock_->AssertSharedHeld(self);
       DoGetAccessFlagsHelper<kReadBarrierOption>(this);
     }
   }
   return access_flags_;
 }

 inline uint16_t ArtMethod::GetMethodIndex() {
   DCHECK(IsRuntimeMethod() || GetDeclaringClass()->IsResolved() ||
          GetDeclaringClass()->IsErroneous());
   return method_index_;
 }

 inline uint16_t ArtMethod::GetMethodIndexDuringLinking() {
   return method_index_;
 }

 inline uint32_t ArtMethod::GetDexMethodIndex() {
   DCHECK(IsRuntimeMethod() || GetDeclaringClass()->IsIdxLoaded() ||
          GetDeclaringClass()->IsErroneous());
   return dex_method_index_;
 }

 inline ArtMethod** ArtMethod::GetDexCacheResolvedMethods(size_t pointer_size) {
   return GetNativePointer<ArtMethod**>(DexCacheResolvedMethodsOffset(pointer_size),
                                        pointer_size);
 }

 inline ArtMethod* ArtMethod::GetDexCacheResolvedMethod(uint16_t method_index, size_t ptr_size) {
   // NOTE: Unchecked, i.e. not throwing AIOOB. We don't even know the length here
   // without accessing the DexCache and we don't want to do that in release build.
   DCHECK_LT(method_index,
             GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()
                 ->GetDexCache()->NumResolvedMethods());
   ArtMethod* method = mirror::DexCache::GetElementPtrSize(GetDexCacheResolvedMethods(ptr_size),
                                                           method_index,
                                                           ptr_size);
   if (LIKELY(method != nullptr)) {
     auto* declaring_class = method->GetDeclaringClass();
     if (LIKELY(declaring_class == nullptr || !declaring_class->IsErroneous())) {
       return method;
     }
   }
   return nullptr;
 }

 inline void ArtMethod::SetDexCacheResolvedMethod(uint16_t method_index, ArtMethod* new_method,
                                                  size_t ptr_size) {
   // NOTE: Unchecked, i.e. not throwing AIOOB. We don't even know the length here
   // without accessing the DexCache and we don't want to do that in release build.
   DCHECK_LT(method_index,
             GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()
                 ->GetDexCache()->NumResolvedMethods());
   DCHECK(new_method == nullptr || new_method->GetDeclaringClass() != nullptr);
   mirror::DexCache::SetElementPtrSize(GetDexCacheResolvedMethods(ptr_size),
                                       method_index,
                                       new_method,
                                       ptr_size);
 }

 inline bool ArtMethod::HasDexCacheResolvedMethods(size_t pointer_size) {
   return GetDexCacheResolvedMethods(pointer_size) != nullptr;
 }

 inline bool ArtMethod::HasSameDexCacheResolvedMethods(ArtMethod** other_cache,
                                                       size_t pointer_size) {
   return GetDexCacheResolvedMethods(pointer_size) == other_cache;
 }

 inline bool ArtMethod::HasSameDexCacheResolvedMethods(ArtMethod* other, size_t pointer_size) {
   return GetDexCacheResolvedMethods(pointer_size) ==
       other->GetDexCacheResolvedMethods(pointer_size);
 }

 inline GcRoot<mirror::Class>* ArtMethod::GetDexCacheResolvedTypes(size_t pointer_size) {
   return GetNativePointer<GcRoot<mirror::Class>*>(DexCacheResolvedTypesOffset(pointer_size),
                                                   pointer_size);
 }

 template <bool kWithCheck>
 inline mirror::Class* ArtMethod::GetDexCacheResolvedType(uint32_t type_index, size_t ptr_size) {
   if (kWithCheck) {
     mirror::DexCache* dex_cache =
         GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()->GetDexCache();
     if (UNLIKELY(type_index >= dex_cache->NumResolvedTypes())) {
       ThrowArrayIndexOutOfBoundsException(type_index, dex_cache->NumResolvedTypes());
       return nullptr;
     }
   }
   mirror::Class* klass = GetDexCacheResolvedTypes(ptr_size)[type_index].Read();
   return (klass != nullptr && !klass->IsErroneous()) ? klass : nullptr;
 }

 inline bool ArtMethod::HasDexCacheResolvedTypes(size_t pointer_size) {
   return GetDexCacheResolvedTypes(pointer_size) != nullptr;
 }

 inline bool ArtMethod::HasSameDexCacheResolvedTypes(GcRoot<mirror::Class>* other_cache,
                                                     size_t pointer_size) {
   return GetDexCacheResolvedTypes(pointer_size) == other_cache;
 }

 inline bool ArtMethod::HasSameDexCacheResolvedTypes(ArtMethod* other, size_t pointer_size) {
   return GetDexCacheResolvedTypes(pointer_size) == other->GetDexCacheResolvedTypes(pointer_size);
 }

 inline mirror::Class* ArtMethod::GetClassFromTypeIndex(uint16_t type_idx,
                                                        bool resolve,
                                                        size_t ptr_size) {
   mirror::Class* type = GetDexCacheResolvedType(type_idx, ptr_size);
   if (type == nullptr && resolve) {
     type = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, this);
     CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
   }
   return type;
 }

 inline bool ArtMethod::CheckIncompatibleClassChange(InvokeType type) {
   switch (type) {
     case kStatic:
       return !IsStatic();
     case kDirect:
       return !IsDirect() || IsStatic();
     case kVirtual: {
       // We have an error if we are direct or a non-default, non-miranda interface method.
       mirror::Class* methods_class = GetDeclaringClass();
       return IsDirect() || (methods_class->IsInterface() && !IsDefault() && !IsMiranda());
     }
     case kSuper:
       // Constructors and static methods are called with invoke-direct.
       return IsConstructor() || IsStatic();
     case kInterface: {
       mirror::Class* methods_class = GetDeclaringClass();
       return IsDirect() || !(methods_class->IsInterface() || methods_class->IsObjectClass());
     }
     default:
       LOG(FATAL) << "Unreachable - invocation type: " << type;
       UNREACHABLE();
   }
 }

 inline bool ArtMethod::IsRuntimeMethod() {
   return dex_method_index_ == DexFile::kDexNoIndex;
 }

 inline bool ArtMethod::IsCalleeSaveMethod() {
   if (!IsRuntimeMethod()) {
     return false;
   }
   Runtime* runtime = Runtime::Current();
   bool result = false;
   for (int i = 0; i < Runtime::kLastCalleeSaveType; i++) {
     if (this == runtime->GetCalleeSaveMethod(Runtime::CalleeSaveType(i))) {
       result = true;
       break;
     }
   }
   return result;
 }

 inline bool ArtMethod::IsResolutionMethod() {
   bool result = this == Runtime::Current()->GetResolutionMethod();
   // Check that if we do think it is phony it looks like the resolution method.
   DCHECK(!result || IsRuntimeMethod());
   return result;
 }

 inline bool ArtMethod::IsImtConflictMethod() {
   bool result = this == Runtime::Current()->GetImtConflictMethod();
   // Check that if we do think it is phony it looks like the imt conflict method.
   DCHECK(!result || IsRuntimeMethod());
   return result;
 }

 inline bool ArtMethod::IsImtUnimplementedMethod() {
   bool result = this == Runtime::Current()->GetImtUnimplementedMethod();
   // Check that if we do think it is phony it looks like the imt unimplemented method.
   DCHECK(!result || IsRuntimeMethod());
   return result;
 }

 inline const DexFile* ArtMethod::GetDexFile() {
   return GetDexCache()->GetDexFile();
 }

 inline const char* ArtMethod::GetDeclaringClassDescriptor() {
   uint32_t dex_method_idx = GetDexMethodIndex();
   if (UNLIKELY(dex_method_idx == DexFile::kDexNoIndex)) {
     return "<runtime method>";
   }
   DCHECK(!IsProxyMethod());
   const DexFile* dex_file = GetDexFile();
   return dex_file->GetMethodDeclaringClassDescriptor(dex_file->GetMethodId(dex_method_idx));
 }

 inline const char* ArtMethod::GetShorty(uint32_t* out_length) {
   DCHECK(!IsProxyMethod());
   const DexFile* dex_file = GetDexFile();
   return dex_file->GetMethodShorty(dex_file->GetMethodId(GetDexMethodIndex()), out_length);
 }

 inline const Signature ArtMethod::GetSignature() {
   uint32_t dex_method_idx = GetDexMethodIndex();
   if (dex_method_idx != DexFile::kDexNoIndex) {
     DCHECK(!IsProxyMethod());
     const DexFile* dex_file = GetDexFile();
     return dex_file->GetMethodSignature(dex_file->GetMethodId(dex_method_idx));
   }
   return Signature::NoSignature();
 }

 inline const char* ArtMethod::GetName() {
   uint32_t dex_method_idx = GetDexMethodIndex();
   if (LIKELY(dex_method_idx != DexFile::kDexNoIndex)) {
     DCHECK(!IsProxyMethod());
     const DexFile* dex_file = GetDexFile();
     return dex_file->GetMethodName(dex_file->GetMethodId(dex_method_idx));
   }
   Runtime* const runtime = Runtime::Current();
   if (this == runtime->GetResolutionMethod()) {
     return "<runtime internal resolution method>";
   } else if (this == runtime->GetImtConflictMethod()) {
     return "<runtime internal imt conflict method>";
   } else if (this == runtime->GetCalleeSaveMethod(Runtime::kSaveAll)) {
     return "<runtime internal callee-save all registers method>";
   } else if (this == runtime->GetCalleeSaveMethod(Runtime::kRefsOnly)) {
     return "<runtime internal callee-save reference registers method>";
   } else if (this == runtime->GetCalleeSaveMethod(Runtime::kRefsAndArgs)) {
     return "<runtime internal callee-save reference and argument registers method>";
   } else {
     return "<unknown runtime internal method>";
   }
 }

 inline const DexFile::CodeItem* ArtMethod::GetCodeItem() {
   return GetDeclaringClass()->GetDexFile().GetCodeItem(GetCodeItemOffset());
 }

 inline bool ArtMethod::IsResolvedTypeIdx(uint16_t type_idx, size_t ptr_size) {
   DCHECK(!IsProxyMethod());
   return GetDexCacheResolvedType(type_idx, ptr_size) != nullptr;
 }

 inline int32_t ArtMethod::GetLineNumFromDexPC(uint32_t dex_pc) {
   DCHECK(!IsProxyMethod());
   if (dex_pc == DexFile::kDexNoIndex) {
     return IsNative() ? -2 : -1;
   }
   return GetDexFile()->GetLineNumFromPC(this, dex_pc);
 }

 inline const DexFile::ProtoId& ArtMethod::GetPrototype() {
   DCHECK(!IsProxyMethod());
   const DexFile* dex_file = GetDexFile();
   return dex_file->GetMethodPrototype(dex_file->GetMethodId(GetDexMethodIndex()));
 }

 inline const DexFile::TypeList* ArtMethod::GetParameterTypeList() {
   DCHECK(!IsProxyMethod());
   const DexFile* dex_file = GetDexFile();
   const DexFile::ProtoId& proto = dex_file->GetMethodPrototype(
       dex_file->GetMethodId(GetDexMethodIndex()));
   return dex_file->GetProtoParameters(proto);
 }

 inline const char* ArtMethod::GetDeclaringClassSourceFile() {
   DCHECK(!IsProxyMethod());
   return GetDeclaringClass()->GetSourceFile();
 }

 inline uint16_t ArtMethod::GetClassDefIndex() {
   DCHECK(!IsProxyMethod());
   return GetDeclaringClass()->GetDexClassDefIndex();
 }

 inline const DexFile::ClassDef& ArtMethod::GetClassDef() {
   DCHECK(!IsProxyMethod());
   return GetDexFile()->GetClassDef(GetClassDefIndex());
 }

 inline const char* ArtMethod::GetReturnTypeDescriptor() {
   DCHECK(!IsProxyMethod());
   const DexFile* dex_file = GetDexFile();
   const DexFile::MethodId& method_id = dex_file->GetMethodId(GetDexMethodIndex());
   const DexFile::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
   uint16_t return_type_idx = proto_id.return_type_idx_;
   return dex_file->GetTypeDescriptor(dex_file->GetTypeId(return_type_idx));
 }

 inline const char* ArtMethod::GetTypeDescriptorFromTypeIdx(uint16_t type_idx) {
   DCHECK(!IsProxyMethod());
   const DexFile* dex_file = GetDexFile();
   return dex_file->GetTypeDescriptor(dex_file->GetTypeId(type_idx));
 }

 inline mirror::ClassLoader* ArtMethod::GetClassLoader() {
   DCHECK(!IsProxyMethod());
   return GetDeclaringClass()->GetClassLoader();
 }

 inline mirror::DexCache* ArtMethod::GetDexCache() {
   DCHECK(!IsProxyMethod());
   return GetDeclaringClass()->GetDexCache();
 }

 inline bool ArtMethod::IsProxyMethod() {
   return GetDeclaringClass()->IsProxyClass();
 }

 inline ArtMethod* ArtMethod::GetInterfaceMethodIfProxy(size_t pointer_size) {
   if (LIKELY(!IsProxyMethod())) {
     return this;
   }
   mirror::Class* klass = GetDeclaringClass();
   ArtMethod* interface_method = mirror::DexCache::GetElementPtrSize(
       GetDexCacheResolvedMethods(pointer_size),
       GetDexMethodIndex(),
       pointer_size);
   DCHECK(interface_method != nullptr);
   DCHECK_EQ(interface_method,
             Runtime::Current()->GetClassLinker()->FindMethodForProxy(klass, this));
   return interface_method;
 }

 inline void ArtMethod::SetDexCacheResolvedMethods(ArtMethod** new_dex_cache_methods,
                                                   size_t ptr_size) {
   SetNativePointer(DexCacheResolvedMethodsOffset(ptr_size), new_dex_cache_methods, ptr_size);
 }

 inline void ArtMethod::SetDexCacheResolvedTypes(GcRoot<mirror::Class>* new_dex_cache_types,
                                                 size_t ptr_size) {
   SetNativePointer(DexCacheResolvedTypesOffset(ptr_size), new_dex_cache_types, ptr_size);
 }

 inline mirror::Class* ArtMethod::GetReturnType(bool resolve, size_t ptr_size) {
   DCHECK(!IsProxyMethod());
   const DexFile* dex_file = GetDexFile();
   const DexFile::MethodId& method_id = dex_file->GetMethodId(GetDexMethodIndex());
   const DexFile::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
   uint16_t return_type_idx = proto_id.return_type_idx_;
   mirror::Class* type = GetDexCacheResolvedType(return_type_idx, ptr_size);
   if (type == nullptr && resolve) {
     type = Runtime::Current()->GetClassLinker()->ResolveType(return_type_idx, this);
     CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
   }
   return type;
 }

 template<typename RootVisitorType>
 void ArtMethod::VisitRoots(RootVisitorType& visitor, size_t pointer_size) {
   ArtMethod* interface_method = nullptr;
   mirror::Class* klass = declaring_class_.Read();
   if (LIKELY(klass != nullptr)) {
     if (UNLIKELY(klass->IsProxyClass())) {
       // For normal methods, dex cache shortcuts will be visited through the declaring class.
       // However, for proxies we need to keep the interface method alive, so we visit its roots.
       interface_method = mirror::DexCache::GetElementPtrSize(
           GetDexCacheResolvedMethods(pointer_size),
           GetDexMethodIndex(),
           pointer_size);
       DCHECK(interface_method != nullptr);
       DCHECK_EQ(interface_method,
                 Runtime::Current()->GetClassLinker()->FindMethodForProxy(klass, this));
       interface_method->VisitRoots(visitor, pointer_size);
     }
     visitor.VisitRoot(declaring_class_.AddressWithoutBarrier());
     if (!IsNative()) {
       ProfilingInfo* profiling_info = GetProfilingInfo(pointer_size);
       if (profiling_info != nullptr) {
         profiling_info->VisitRoots(visitor);
       }
     }
   }
 }

 template <typename Visitor>
 inline void ArtMethod::UpdateObjectsForImageRelocation(const Visitor& visitor) {
   mirror::Class* old_class = GetDeclaringClassUnchecked<kWithoutReadBarrier>();
   mirror::Class* new_class = visitor(old_class);
   if (old_class != new_class) {
     SetDeclaringClass(new_class);
   }
   ArtMethod** old_methods = GetDexCacheResolvedMethods(sizeof(void*));
   ArtMethod** new_methods = visitor(old_methods);
   if (old_methods != new_methods) {
     SetDexCacheResolvedMethods(new_methods, sizeof(void*));
   }
   GcRoot<mirror::Class>* old_types = GetDexCacheResolvedTypes(sizeof(void*));
   GcRoot<mirror::Class>* new_types = visitor(old_types);
   if (old_types != new_types) {
     SetDexCacheResolvedTypes(new_types, sizeof(void*));
   }
 }

 template <ReadBarrierOption kReadBarrierOption, typename Visitor>
 inline void ArtMethod::UpdateEntrypoints(const Visitor& visitor) {
   if (IsNative<kReadBarrierOption>()) {
     const void* old_native_code = GetEntryPointFromJni();
     const void* new_native_code = visitor(old_native_code);
     if (old_native_code != new_native_code) {
       SetEntryPointFromJni(new_native_code);
     }
   } else {
     DCHECK(GetEntryPointFromJni() == nullptr);
   }
   const void* old_code = GetEntryPointFromQuickCompiledCode();
   const void* new_code = visitor(old_code);
   if (old_code != new_code) {
     SetEntryPointFromQuickCompiledCode(new_code);
   }
 }

 }  // namespace art

 #endif  // ART_RUNTIME_ART_METHOD_INL_H_
	/*
	* Copyright (C) 2011 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef ART_RUNTIME_ART_METHOD_INL_H_
	#define ART_RUNTIME_ART_METHOD_INL_H_

	#include "art_method.h"

	#include "art_field.h"
	#include "base/logging.h"
	#include "class_linker-inl.h"
	#include "common_throws.h"
	#include "dex_file.h"
	#include "dex_file-inl.h"
	#include "gc_root-inl.h"
	#include "jit/profiling_info.h"
	#include "mirror/class-inl.h"
	#include "mirror/dex_cache-inl.h"
	#include "mirror/object-inl.h"
	#include "mirror/object_array.h"
	#include "oat.h"
	#include "quick/quick_method_frame_info.h"
	#include "read_barrier-inl.h"
	#include "runtime-inl.h"
	#include "scoped_thread_state_change.h"
	#include "thread-inl.h"
	#include "utils.h"

	namespace art {

	template <ReadBarrierOption kReadBarrierOption>
	inline mirror::Class* ArtMethod::GetDeclaringClassUnchecked() {
	GcRootSource gc_root_source(this);
	return declaring_class_.Read<kReadBarrierOption>(&gc_root_source);
	}

	template <ReadBarrierOption kReadBarrierOption>
	inline mirror::Class* ArtMethod::GetDeclaringClass() {
	mirror::Class* result = GetDeclaringClassUnchecked<kReadBarrierOption>();
	if (kIsDebugBuild) {
	if (!IsRuntimeMethod()) {
	CHECK(result != nullptr) << this;
	CHECK(result->IsIdxLoaded() \|\| result->IsErroneous())
	<< result->GetStatus() << " " << PrettyClass(result);
	} else {
	CHECK(result == nullptr) << this;
	}
	}
	return result;
	}

	inline void ArtMethod::SetDeclaringClass(mirror::Class* new_declaring_class) {
	declaring_class_ = GcRoot<mirror::Class>(new_declaring_class);
	}

	inline bool ArtMethod::CASDeclaringClass(mirror::Class* expected_class,
	mirror::Class* desired_class) {
	GcRoot<mirror::Class> expected_root(expected_class);
	GcRoot<mirror::Class> desired_root(desired_class);
	return reinterpret_cast<Atomic<GcRoot<mirror::Class>>*>(&declaring_class_)->
	CompareExchangeStrongSequentiallyConsistent(
	expected_root, desired_root);
	}

	// AssertSharedHeld doesn't work in GetAccessFlags, so use a NO_THREAD_SAFETY_ANALYSIS helper.
	// TODO: Figure out why ASSERT_SHARED_CAPABILITY doesn't work.
	template <ReadBarrierOption kReadBarrierOption>
	ALWAYS_INLINE static inline void DoGetAccessFlagsHelper(ArtMethod* method)
	NO_THREAD_SAFETY_ANALYSIS {
	CHECK(method->IsRuntimeMethod() \|\|
	method->GetDeclaringClass<kReadBarrierOption>()->IsIdxLoaded() \|\|
	method->GetDeclaringClass<kReadBarrierOption>()->IsErroneous());
	}

	template <ReadBarrierOption kReadBarrierOption>
	inline uint32_t ArtMethod::GetAccessFlags() {
	if (kIsDebugBuild) {
	Thread* self = Thread::Current();
	if (!Locks::mutator_lock_->IsSharedHeld(self)) {
	ScopedObjectAccess soa(self);
	CHECK(IsRuntimeMethod() \|\|
	GetDeclaringClass<kReadBarrierOption>()->IsIdxLoaded() \|\|
	GetDeclaringClass<kReadBarrierOption>()->IsErroneous());
	} else {
	// We cannot use SOA in this case. We might be holding the lock, but may not be in the
	// runnable state (e.g., during GC).
	Locks::mutator_lock_->AssertSharedHeld(self);
	DoGetAccessFlagsHelper<kReadBarrierOption>(this);
	}
	}
	return access_flags_;
	}

	inline uint16_t ArtMethod::GetMethodIndex() {
	DCHECK(IsRuntimeMethod() \|\| GetDeclaringClass()->IsResolved() \|\|
	GetDeclaringClass()->IsErroneous());
	return method_index_;
	}

	inline uint16_t ArtMethod::GetMethodIndexDuringLinking() {
	return method_index_;
	}

	inline uint32_t ArtMethod::GetDexMethodIndex() {
	DCHECK(IsRuntimeMethod() \|\| GetDeclaringClass()->IsIdxLoaded() \|\|
	GetDeclaringClass()->IsErroneous());
	return dex_method_index_;
	}

	inline ArtMethod** ArtMethod::GetDexCacheResolvedMethods(size_t pointer_size) {
	return GetNativePointer<ArtMethod**>(DexCacheResolvedMethodsOffset(pointer_size),
	pointer_size);
	}

	inline ArtMethod* ArtMethod::GetDexCacheResolvedMethod(uint16_t method_index, size_t ptr_size) {
	// NOTE: Unchecked, i.e. not throwing AIOOB. We don't even know the length here
	// without accessing the DexCache and we don't want to do that in release build.
	DCHECK_LT(method_index,
	GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()
	->GetDexCache()->NumResolvedMethods());
	ArtMethod* method = mirror::DexCache::GetElementPtrSize(GetDexCacheResolvedMethods(ptr_size),
	method_index,
	ptr_size);
	if (LIKELY(method != nullptr)) {
	auto* declaring_class = method->GetDeclaringClass();
	if (LIKELY(declaring_class == nullptr \|\| !declaring_class->IsErroneous())) {
	return method;
	}
	}
	return nullptr;
	}

	inline void ArtMethod::SetDexCacheResolvedMethod(uint16_t method_index, ArtMethod* new_method,
	size_t ptr_size) {
	// NOTE: Unchecked, i.e. not throwing AIOOB. We don't even know the length here
	// without accessing the DexCache and we don't want to do that in release build.
	DCHECK_LT(method_index,
	GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()
	->GetDexCache()->NumResolvedMethods());
	DCHECK(new_method == nullptr \|\| new_method->GetDeclaringClass() != nullptr);
	mirror::DexCache::SetElementPtrSize(GetDexCacheResolvedMethods(ptr_size),
	method_index,
	new_method,
	ptr_size);
	}

	inline bool ArtMethod::HasDexCacheResolvedMethods(size_t pointer_size) {
	return GetDexCacheResolvedMethods(pointer_size) != nullptr;
	}

	inline bool ArtMethod::HasSameDexCacheResolvedMethods(ArtMethod** other_cache,
	size_t pointer_size) {
	return GetDexCacheResolvedMethods(pointer_size) == other_cache;
	}

	inline bool ArtMethod::HasSameDexCacheResolvedMethods(ArtMethod* other, size_t pointer_size) {
	return GetDexCacheResolvedMethods(pointer_size) ==
	other->GetDexCacheResolvedMethods(pointer_size);
	}

	inline GcRoot<mirror::Class>* ArtMethod::GetDexCacheResolvedTypes(size_t pointer_size) {
	return GetNativePointer<GcRoot<mirror::Class>*>(DexCacheResolvedTypesOffset(pointer_size),
	pointer_size);
	}

	template <bool kWithCheck>
	inline mirror::Class* ArtMethod::GetDexCacheResolvedType(uint32_t type_index, size_t ptr_size) {
	if (kWithCheck) {
	mirror::DexCache* dex_cache =
	GetInterfaceMethodIfProxy(ptr_size)->GetDeclaringClass()->GetDexCache();
	if (UNLIKELY(type_index >= dex_cache->NumResolvedTypes())) {
	ThrowArrayIndexOutOfBoundsException(type_index, dex_cache->NumResolvedTypes());
	return nullptr;
	}
	}
	mirror::Class* klass = GetDexCacheResolvedTypes(ptr_size)[type_index].Read();
	return (klass != nullptr && !klass->IsErroneous()) ? klass : nullptr;
	}

	inline bool ArtMethod::HasDexCacheResolvedTypes(size_t pointer_size) {
	return GetDexCacheResolvedTypes(pointer_size) != nullptr;
	}

	inline bool ArtMethod::HasSameDexCacheResolvedTypes(GcRoot<mirror::Class>* other_cache,
	size_t pointer_size) {
	return GetDexCacheResolvedTypes(pointer_size) == other_cache;
	}

	inline bool ArtMethod::HasSameDexCacheResolvedTypes(ArtMethod* other, size_t pointer_size) {
	return GetDexCacheResolvedTypes(pointer_size) == other->GetDexCacheResolvedTypes(pointer_size);
	}

	inline mirror::Class* ArtMethod::GetClassFromTypeIndex(uint16_t type_idx,
	bool resolve,
	size_t ptr_size) {
	mirror::Class* type = GetDexCacheResolvedType(type_idx, ptr_size);
	if (type == nullptr && resolve) {
	type = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, this);
	CHECK(type != nullptr \|\| Thread::Current()->IsExceptionPending());
	}
	return type;
	}

	inline bool ArtMethod::CheckIncompatibleClassChange(InvokeType type) {
	switch (type) {
	case kStatic:
	return !IsStatic();
	case kDirect:
	return !IsDirect() \|\| IsStatic();
	case kVirtual: {
	// We have an error if we are direct or a non-default, non-miranda interface method.
	mirror::Class* methods_class = GetDeclaringClass();
	return IsDirect() \|\| (methods_class->IsInterface() && !IsDefault() && !IsMiranda());
	}
	case kSuper:
	// Constructors and static methods are called with invoke-direct.
	return IsConstructor() \|\| IsStatic();
	case kInterface: {
	mirror::Class* methods_class = GetDeclaringClass();
	return IsDirect() \|\| !(methods_class->IsInterface() \|\| methods_class->IsObjectClass());
	}
	default:
	LOG(FATAL) << "Unreachable - invocation type: " << type;
	UNREACHABLE();
	}
	}

	inline bool ArtMethod::IsRuntimeMethod() {
	return dex_method_index_ == DexFile::kDexNoIndex;
	}

	inline bool ArtMethod::IsCalleeSaveMethod() {
	if (!IsRuntimeMethod()) {
	return false;
	}
	Runtime* runtime = Runtime::Current();
	bool result = false;
	for (int i = 0; i < Runtime::kLastCalleeSaveType; i++) {
	if (this == runtime->GetCalleeSaveMethod(Runtime::CalleeSaveType(i))) {
	result = true;
	break;
	}
	}
	return result;
	}

	inline bool ArtMethod::IsResolutionMethod() {
	bool result = this == Runtime::Current()->GetResolutionMethod();
	// Check that if we do think it is phony it looks like the resolution method.
	DCHECK(!result \|\| IsRuntimeMethod());
	return result;
	}

	inline bool ArtMethod::IsImtConflictMethod() {
	bool result = this == Runtime::Current()->GetImtConflictMethod();
	// Check that if we do think it is phony it looks like the imt conflict method.
	DCHECK(!result \|\| IsRuntimeMethod());
	return result;
	}

	inline bool ArtMethod::IsImtUnimplementedMethod() {
	bool result = this == Runtime::Current()->GetImtUnimplementedMethod();
	// Check that if we do think it is phony it looks like the imt unimplemented method.
	DCHECK(!result \|\| IsRuntimeMethod());
	return result;
	}

	inline const DexFile* ArtMethod::GetDexFile() {
	return GetDexCache()->GetDexFile();
	}

	inline const char* ArtMethod::GetDeclaringClassDescriptor() {
	uint32_t dex_method_idx = GetDexMethodIndex();
	if (UNLIKELY(dex_method_idx == DexFile::kDexNoIndex)) {
	return "<runtime method>";
	}
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	return dex_file->GetMethodDeclaringClassDescriptor(dex_file->GetMethodId(dex_method_idx));
	}

	inline const char* ArtMethod::GetShorty(uint32_t* out_length) {
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	return dex_file->GetMethodShorty(dex_file->GetMethodId(GetDexMethodIndex()), out_length);
	}

	inline const Signature ArtMethod::GetSignature() {
	uint32_t dex_method_idx = GetDexMethodIndex();
	if (dex_method_idx != DexFile::kDexNoIndex) {
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	return dex_file->GetMethodSignature(dex_file->GetMethodId(dex_method_idx));
	}
	return Signature::NoSignature();
	}

	inline const char* ArtMethod::GetName() {
	uint32_t dex_method_idx = GetDexMethodIndex();
	if (LIKELY(dex_method_idx != DexFile::kDexNoIndex)) {
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	return dex_file->GetMethodName(dex_file->GetMethodId(dex_method_idx));
	}
	Runtime* const runtime = Runtime::Current();
	if (this == runtime->GetResolutionMethod()) {
	return "<runtime internal resolution method>";
	} else if (this == runtime->GetImtConflictMethod()) {
	return "<runtime internal imt conflict method>";
	} else if (this == runtime->GetCalleeSaveMethod(Runtime::kSaveAll)) {
	return "<runtime internal callee-save all registers method>";
	} else if (this == runtime->GetCalleeSaveMethod(Runtime::kRefsOnly)) {
	return "<runtime internal callee-save reference registers method>";
	} else if (this == runtime->GetCalleeSaveMethod(Runtime::kRefsAndArgs)) {
	return "<runtime internal callee-save reference and argument registers method>";
	} else {
	return "<unknown runtime internal method>";
	}
	}

	inline const DexFile::CodeItem* ArtMethod::GetCodeItem() {
	return GetDeclaringClass()->GetDexFile().GetCodeItem(GetCodeItemOffset());
	}

	inline bool ArtMethod::IsResolvedTypeIdx(uint16_t type_idx, size_t ptr_size) {
	DCHECK(!IsProxyMethod());
	return GetDexCacheResolvedType(type_idx, ptr_size) != nullptr;
	}

	inline int32_t ArtMethod::GetLineNumFromDexPC(uint32_t dex_pc) {
	DCHECK(!IsProxyMethod());
	if (dex_pc == DexFile::kDexNoIndex) {
	return IsNative() ? -2 : -1;
	}
	return GetDexFile()->GetLineNumFromPC(this, dex_pc);
	}

	inline const DexFile::ProtoId& ArtMethod::GetPrototype() {
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	return dex_file->GetMethodPrototype(dex_file->GetMethodId(GetDexMethodIndex()));
	}

	inline const DexFile::TypeList* ArtMethod::GetParameterTypeList() {
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	const DexFile::ProtoId& proto = dex_file->GetMethodPrototype(
	dex_file->GetMethodId(GetDexMethodIndex()));
	return dex_file->GetProtoParameters(proto);
	}

	inline const char* ArtMethod::GetDeclaringClassSourceFile() {
	DCHECK(!IsProxyMethod());
	return GetDeclaringClass()->GetSourceFile();
	}

	inline uint16_t ArtMethod::GetClassDefIndex() {
	DCHECK(!IsProxyMethod());
	return GetDeclaringClass()->GetDexClassDefIndex();
	}

	inline const DexFile::ClassDef& ArtMethod::GetClassDef() {
	DCHECK(!IsProxyMethod());
	return GetDexFile()->GetClassDef(GetClassDefIndex());
	}

	inline const char* ArtMethod::GetReturnTypeDescriptor() {
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	const DexFile::MethodId& method_id = dex_file->GetMethodId(GetDexMethodIndex());
	const DexFile::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
	uint16_t return_type_idx = proto_id.return_type_idx_;
	return dex_file->GetTypeDescriptor(dex_file->GetTypeId(return_type_idx));
	}

	inline const char* ArtMethod::GetTypeDescriptorFromTypeIdx(uint16_t type_idx) {
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	return dex_file->GetTypeDescriptor(dex_file->GetTypeId(type_idx));
	}

	inline mirror::ClassLoader* ArtMethod::GetClassLoader() {
	DCHECK(!IsProxyMethod());
	return GetDeclaringClass()->GetClassLoader();
	}

	inline mirror::DexCache* ArtMethod::GetDexCache() {
	DCHECK(!IsProxyMethod());
	return GetDeclaringClass()->GetDexCache();
	}

	inline bool ArtMethod::IsProxyMethod() {
	return GetDeclaringClass()->IsProxyClass();
	}

	inline ArtMethod* ArtMethod::GetInterfaceMethodIfProxy(size_t pointer_size) {
	if (LIKELY(!IsProxyMethod())) {
	return this;
	}
	mirror::Class* klass = GetDeclaringClass();
	ArtMethod* interface_method = mirror::DexCache::GetElementPtrSize(
	GetDexCacheResolvedMethods(pointer_size),
	GetDexMethodIndex(),
	pointer_size);
	DCHECK(interface_method != nullptr);
	DCHECK_EQ(interface_method,
	Runtime::Current()->GetClassLinker()->FindMethodForProxy(klass, this));
	return interface_method;
	}

	inline void ArtMethod::SetDexCacheResolvedMethods(ArtMethod** new_dex_cache_methods,
	size_t ptr_size) {
	SetNativePointer(DexCacheResolvedMethodsOffset(ptr_size), new_dex_cache_methods, ptr_size);
	}

	inline void ArtMethod::SetDexCacheResolvedTypes(GcRoot<mirror::Class>* new_dex_cache_types,
	size_t ptr_size) {
	SetNativePointer(DexCacheResolvedTypesOffset(ptr_size), new_dex_cache_types, ptr_size);
	}

	inline mirror::Class* ArtMethod::GetReturnType(bool resolve, size_t ptr_size) {
	DCHECK(!IsProxyMethod());
	const DexFile* dex_file = GetDexFile();
	const DexFile::MethodId& method_id = dex_file->GetMethodId(GetDexMethodIndex());
	const DexFile::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
	uint16_t return_type_idx = proto_id.return_type_idx_;
	mirror::Class* type = GetDexCacheResolvedType(return_type_idx, ptr_size);
	if (type == nullptr && resolve) {
	type = Runtime::Current()->GetClassLinker()->ResolveType(return_type_idx, this);
	CHECK(type != nullptr \|\| Thread::Current()->IsExceptionPending());
	}
	return type;
	}

	template<typename RootVisitorType>
	void ArtMethod::VisitRoots(RootVisitorType& visitor, size_t pointer_size) {
	ArtMethod* interface_method = nullptr;
	mirror::Class* klass = declaring_class_.Read();
	if (LIKELY(klass != nullptr)) {
	if (UNLIKELY(klass->IsProxyClass())) {
	// For normal methods, dex cache shortcuts will be visited through the declaring class.
	// However, for proxies we need to keep the interface method alive, so we visit its roots.
	interface_method = mirror::DexCache::GetElementPtrSize(
	GetDexCacheResolvedMethods(pointer_size),
	GetDexMethodIndex(),
	pointer_size);
	DCHECK(interface_method != nullptr);
	DCHECK_EQ(interface_method,
	Runtime::Current()->GetClassLinker()->FindMethodForProxy(klass, this));
	interface_method->VisitRoots(visitor, pointer_size);
	}
	visitor.VisitRoot(declaring_class_.AddressWithoutBarrier());
	if (!IsNative()) {
	ProfilingInfo* profiling_info = GetProfilingInfo(pointer_size);
	if (profiling_info != nullptr) {
	profiling_info->VisitRoots(visitor);
	}
	}
	}
	}

	template <typename Visitor>
	inline void ArtMethod::UpdateObjectsForImageRelocation(const Visitor& visitor) {
	mirror::Class* old_class = GetDeclaringClassUnchecked<kWithoutReadBarrier>();
	mirror::Class* new_class = visitor(old_class);
	if (old_class != new_class) {
	SetDeclaringClass(new_class);
	}
	ArtMethod** old_methods = GetDexCacheResolvedMethods(sizeof(void*));
	ArtMethod** new_methods = visitor(old_methods);
	if (old_methods != new_methods) {
	SetDexCacheResolvedMethods(new_methods, sizeof(void*));
	}
	GcRoot<mirror::Class>* old_types = GetDexCacheResolvedTypes(sizeof(void*));
	GcRoot<mirror::Class>* new_types = visitor(old_types);
	if (old_types != new_types) {
	SetDexCacheResolvedTypes(new_types, sizeof(void*));
	}
	}

	template <ReadBarrierOption kReadBarrierOption, typename Visitor>
	inline void ArtMethod::UpdateEntrypoints(const Visitor& visitor) {
	if (IsNative<kReadBarrierOption>()) {
	const void* old_native_code = GetEntryPointFromJni();
	const void* new_native_code = visitor(old_native_code);
	if (old_native_code != new_native_code) {
	SetEntryPointFromJni(new_native_code);
	}
	} else {
	DCHECK(GetEntryPointFromJni() == nullptr);
	}
	const void* old_code = GetEntryPointFromQuickCompiledCode();
	const void* new_code = visitor(old_code);
	if (old_code != new_code) {
	SetEntryPointFromQuickCompiledCode(new_code);
	}
	}

	} // namespace art

	#endif // ART_RUNTIME_ART_METHOD_INL_H_