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android13/art/runtime/mirror/class-inl.h

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/*
* 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_MIRROR_CLASS_INL_H_
#define ART_RUNTIME_MIRROR_CLASS_INL_H_
#include "class.h"
#include "art_field.h"
#include "art_method.h"
#include "base/array_slice.h"
#include "base/iteration_range.h"
#include "base/length_prefixed_array.h"
#include "base/stride_iterator.h"
#include "base/utils.h"
#include "class_linker.h"
#include "class_loader.h"
#include "common_throws.h"
#include "dex/dex_file-inl.h"
#include "dex/invoke_type.h"
#include "dex_cache.h"
#include "hidden_api.h"
#include "iftable-inl.h"
#include "imtable.h"
#include "object-inl.h"
#include "read_barrier-inl.h"
#include "runtime.h"
#include "string.h"
#include "subtype_check.h"
#include "thread-current-inl.h"
namespace art {
namespace mirror {
template<VerifyObjectFlags kVerifyFlags>
inline uint32_t Class::GetObjectSize() {
// Note: Extra parentheses to avoid the comma being interpreted as macro parameter separator.
DCHECK((!IsVariableSize<kVerifyFlags>())) << "class=" << PrettyTypeOf();
return GetField32(ObjectSizeOffset());
}
template<VerifyObjectFlags kVerifyFlags>
inline uint32_t Class::GetObjectSizeAllocFastPath() {
// Note: Extra parentheses to avoid the comma being interpreted as macro parameter separator.
DCHECK((!IsVariableSize<kVerifyFlags>())) << "class=" << PrettyTypeOf();
return GetField32(ObjectSizeAllocFastPathOffset());
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline ObjPtr<Class> Class::GetSuperClass() {
// Can only get super class for loaded classes (hack for when runtime is
// initializing)
DCHECK(IsLoaded<kVerifyFlags>() ||
IsErroneous<kVerifyFlags>() ||
!Runtime::Current()->IsStarted()) << IsLoaded();
return GetFieldObject<Class, kVerifyFlags, kReadBarrierOption>(
OFFSET_OF_OBJECT_MEMBER(Class, super_class_));
}
inline void Class::SetSuperClass(ObjPtr<Class> new_super_class) {
// Super class is assigned once, except during class linker initialization.
if (kIsDebugBuild) {
ObjPtr<Class> old_super_class =
GetFieldObject<Class>(OFFSET_OF_OBJECT_MEMBER(Class, super_class_));
DCHECK(old_super_class == nullptr || old_super_class == new_super_class);
}
DCHECK(new_super_class != nullptr);
SetFieldObject</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
OFFSET_OF_OBJECT_MEMBER(Class, super_class_), new_super_class);
}
inline bool Class::HasSuperClass() {
// No read barrier is needed for comparing with null. See ReadBarrierOption.
return GetSuperClass<kDefaultVerifyFlags, kWithoutReadBarrier>() != nullptr;
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline ObjPtr<ClassLoader> Class::GetClassLoader() {
return GetFieldObject<ClassLoader, kVerifyFlags, kReadBarrierOption>(
OFFSET_OF_OBJECT_MEMBER(Class, class_loader_));
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline ObjPtr<ClassExt> Class::GetExtData() {
return GetFieldObject<ClassExt, kVerifyFlags, kReadBarrierOption>(
OFFSET_OF_OBJECT_MEMBER(Class, ext_data_));
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline ObjPtr<DexCache> Class::GetDexCache() {
return GetFieldObject<DexCache, kVerifyFlags, kReadBarrierOption>(
OFFSET_OF_OBJECT_MEMBER(Class, dex_cache_));
}
inline uint32_t Class::GetCopiedMethodsStartOffset() {
// Object::GetFieldShort returns an int16_t value, but
// Class::copied_methods_offset_ is an uint16_t value; cast the
// latter to uint16_t before returning it as an uint32_t value, so
// that uint16_t values between 2^15 and 2^16-1 are correctly
// handled.
return static_cast<uint16_t>(
GetFieldShort(OFFSET_OF_OBJECT_MEMBER(Class, copied_methods_offset_)));
}
inline uint32_t Class::GetDirectMethodsStartOffset() {
return 0;
}
inline uint32_t Class::GetVirtualMethodsStartOffset() {
// Object::GetFieldShort returns an int16_t value, but
// Class::virtual_method_offset_ is an uint16_t value; cast the
// latter to uint16_t before returning it as an uint32_t value, so
// that uint16_t values between 2^15 and 2^16-1 are correctly
// handled.
return static_cast<uint16_t>(
GetFieldShort(OFFSET_OF_OBJECT_MEMBER(Class, virtual_methods_offset_)));
}
template<VerifyObjectFlags kVerifyFlags>
inline ArraySlice<ArtMethod> Class::GetDirectMethodsSlice(PointerSize pointer_size) {
DCHECK(IsLoaded() || IsErroneous()) << GetStatus();
return GetDirectMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetDirectMethodsSliceUnchecked(PointerSize pointer_size) {
return GetMethodsSliceRangeUnchecked(GetMethodsPtr(),
pointer_size,
GetDirectMethodsStartOffset(),
GetVirtualMethodsStartOffset());
}
template<VerifyObjectFlags kVerifyFlags>
inline ArraySlice<ArtMethod> Class::GetDeclaredMethodsSlice(PointerSize pointer_size) {
DCHECK(IsLoaded() || IsErroneous()) << GetStatus();
return GetDeclaredMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetDeclaredMethodsSliceUnchecked(PointerSize pointer_size) {
return GetMethodsSliceRangeUnchecked(GetMethodsPtr(),
pointer_size,
GetDirectMethodsStartOffset(),
GetCopiedMethodsStartOffset());
}
template<VerifyObjectFlags kVerifyFlags>
inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethodsSlice(PointerSize pointer_size) {
DCHECK(IsLoaded() || IsErroneous()) << GetStatus();
return GetDeclaredVirtualMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethodsSliceUnchecked(
PointerSize pointer_size) {
return GetMethodsSliceRangeUnchecked(GetMethodsPtr(),
pointer_size,
GetVirtualMethodsStartOffset(),
GetCopiedMethodsStartOffset());
}
template<VerifyObjectFlags kVerifyFlags>
inline ArraySlice<ArtMethod> Class::GetVirtualMethodsSlice(PointerSize pointer_size) {
DCHECK(IsLoaded() || IsErroneous());
return GetVirtualMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetVirtualMethodsSliceUnchecked(PointerSize pointer_size) {
LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
return GetMethodsSliceRangeUnchecked(methods,
pointer_size,
GetVirtualMethodsStartOffset(),
NumMethods(methods));
}
template<VerifyObjectFlags kVerifyFlags>
inline ArraySlice<ArtMethod> Class::GetCopiedMethodsSlice(PointerSize pointer_size) {
DCHECK(IsLoaded() || IsErroneous());
return GetCopiedMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetCopiedMethodsSliceUnchecked(PointerSize pointer_size) {
LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
return GetMethodsSliceRangeUnchecked(methods,
pointer_size,
GetCopiedMethodsStartOffset(),
NumMethods(methods));
}
inline LengthPrefixedArray<ArtMethod>* Class::GetMethodsPtr() {
return reinterpret_cast<LengthPrefixedArray<ArtMethod>*>(
static_cast<uintptr_t>(GetField64(OFFSET_OF_OBJECT_MEMBER(Class, methods_))));
}
template<VerifyObjectFlags kVerifyFlags>
inline ArraySlice<ArtMethod> Class::GetMethodsSlice(PointerSize pointer_size) {
DCHECK(IsLoaded() || IsErroneous());
LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
return GetMethodsSliceRangeUnchecked(methods, pointer_size, 0, NumMethods(methods));
}
inline ArraySlice<ArtMethod> Class::GetMethodsSliceRangeUnchecked(
LengthPrefixedArray<ArtMethod>* methods,
PointerSize pointer_size,
uint32_t start_offset,
uint32_t end_offset) {
DCHECK_LE(start_offset, end_offset);
DCHECK_LE(end_offset, NumMethods(methods));
uint32_t size = end_offset - start_offset;
if (size == 0u) {
return ArraySlice<ArtMethod>();
}
DCHECK(methods != nullptr);
DCHECK_LE(end_offset, methods->size());
size_t method_size = ArtMethod::Size(pointer_size);
size_t method_alignment = ArtMethod::Alignment(pointer_size);
ArraySlice<ArtMethod> slice(&methods->At(0u, method_size, method_alignment),
methods->size(),
method_size);
return slice.SubArray(start_offset, size);
}
inline uint32_t Class::NumMethods() {
return NumMethods(GetMethodsPtr());
}
inline uint32_t Class::NumMethods(LengthPrefixedArray<ArtMethod>* methods) {
return (methods == nullptr) ? 0 : methods->size();
}
inline ArtMethod* Class::GetDirectMethodUnchecked(size_t i, PointerSize pointer_size) {
CheckPointerSize(pointer_size);
return &GetDirectMethodsSliceUnchecked(pointer_size)[i];
}
inline ArtMethod* Class::GetDirectMethod(size_t i, PointerSize pointer_size) {
CheckPointerSize(pointer_size);
return &GetDirectMethodsSlice(pointer_size)[i];
}
inline void Class::SetMethodsPtr(LengthPrefixedArray<ArtMethod>* new_methods,
uint32_t num_direct,
uint32_t num_virtual) {
DCHECK(GetMethodsPtr() == nullptr);
SetMethodsPtrUnchecked(new_methods, num_direct, num_virtual);
}
inline void Class::SetMethodsPtrUnchecked(LengthPrefixedArray<ArtMethod>* new_methods,
uint32_t num_direct,
uint32_t num_virtual) {
DCHECK_LE(num_direct + num_virtual, (new_methods == nullptr) ? 0 : new_methods->size());
SetField64<false>(OFFSET_OF_OBJECT_MEMBER(Class, methods_),
static_cast<uint64_t>(reinterpret_cast<uintptr_t>(new_methods)));
SetFieldShort<false>(OFFSET_OF_OBJECT_MEMBER(Class, copied_methods_offset_),
dchecked_integral_cast<uint16_t>(num_direct + num_virtual));
SetFieldShort<false>(OFFSET_OF_OBJECT_MEMBER(Class, virtual_methods_offset_),
dchecked_integral_cast<uint16_t>(num_direct));
}
template<VerifyObjectFlags kVerifyFlags>
inline ArtMethod* Class::GetVirtualMethod(size_t i, PointerSize pointer_size) {
CheckPointerSize(pointer_size);
DCHECK(IsResolved<kVerifyFlags>() || IsErroneous<kVerifyFlags>())
<< Class::PrettyClass() << " status=" << GetStatus();
return GetVirtualMethodUnchecked(i, pointer_size);
}
inline ArtMethod* Class::GetVirtualMethodDuringLinking(size_t i, PointerSize pointer_size) {
CheckPointerSize(pointer_size);
DCHECK(IsLoaded() || IsErroneous());
return GetVirtualMethodUnchecked(i, pointer_size);
}
inline ArtMethod* Class::GetVirtualMethodUnchecked(size_t i, PointerSize pointer_size) {
CheckPointerSize(pointer_size);
return &GetVirtualMethodsSliceUnchecked(pointer_size)[i];
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline ObjPtr<PointerArray> Class::GetVTable() {
DCHECK(IsLoaded<kVerifyFlags>() || IsErroneous<kVerifyFlags>());
return GetFieldObject<PointerArray, kVerifyFlags, kReadBarrierOption>(
OFFSET_OF_OBJECT_MEMBER(Class, vtable_));
}
inline ObjPtr<PointerArray> Class::GetVTableDuringLinking() {
DCHECK(IsLoaded() || IsErroneous());
return GetFieldObject<PointerArray>(OFFSET_OF_OBJECT_MEMBER(Class, vtable_));
}
inline void Class::SetVTable(ObjPtr<PointerArray> new_vtable) {
SetFieldObject</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
OFFSET_OF_OBJECT_MEMBER(Class, vtable_), new_vtable);
}
template<VerifyObjectFlags kVerifyFlags>
inline bool Class::ShouldHaveImt() {
return ShouldHaveEmbeddedVTable<kVerifyFlags>();
}
template<VerifyObjectFlags kVerifyFlags>
inline bool Class::ShouldHaveEmbeddedVTable() {
return IsInstantiable<kVerifyFlags>();
}
inline bool Class::HasVTable() {
// No read barrier is needed for comparing with null. See ReadBarrierOption.
return GetVTable<kDefaultVerifyFlags, kWithoutReadBarrier>() != nullptr ||
ShouldHaveEmbeddedVTable();
}
template<VerifyObjectFlags kVerifyFlags>
inline int32_t Class::GetVTableLength() {
if (ShouldHaveEmbeddedVTable<kVerifyFlags>()) {
return GetEmbeddedVTableLength();
}
// We do not need a read barrier here as the length is constant,
// both from-space and to-space vtables shall yield the same result.
ObjPtr<PointerArray> vtable = GetVTable<kVerifyFlags, kWithoutReadBarrier>();
return vtable != nullptr ? vtable->GetLength() : 0;
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline ArtMethod* Class::GetVTableEntry(uint32_t i, PointerSize pointer_size) {
if (ShouldHaveEmbeddedVTable<kVerifyFlags>()) {
return GetEmbeddedVTableEntry(i, pointer_size);
}
ObjPtr<PointerArray> vtable = GetVTable<kVerifyFlags, kReadBarrierOption>();
DCHECK(vtable != nullptr);
return vtable->GetElementPtrSize<ArtMethod*, kVerifyFlags>(i, pointer_size);
}
template<VerifyObjectFlags kVerifyFlags>
inline int32_t Class::GetEmbeddedVTableLength() {
return GetField32<kVerifyFlags>(MemberOffset(EmbeddedVTableLengthOffset()));
}
inline void Class::SetEmbeddedVTableLength(int32_t len) {
SetField32</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
MemberOffset(EmbeddedVTableLengthOffset()), len);
}
inline ImTable* Class::GetImt(PointerSize pointer_size) {
return GetFieldPtrWithSize<ImTable*>(ImtPtrOffset(pointer_size), pointer_size);
}
inline void Class::SetImt(ImTable* imt, PointerSize pointer_size) {
return SetFieldPtrWithSize</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
ImtPtrOffset(pointer_size), imt, pointer_size);
}
inline MemberOffset Class::EmbeddedVTableEntryOffset(uint32_t i, PointerSize pointer_size) {
return MemberOffset(
EmbeddedVTableOffset(pointer_size).Uint32Value() + i * VTableEntrySize(pointer_size));
}
inline ArtMethod* Class::GetEmbeddedVTableEntry(uint32_t i, PointerSize pointer_size) {
return GetFieldPtrWithSize<ArtMethod*>(EmbeddedVTableEntryOffset(i, pointer_size), pointer_size);
}
inline void Class::SetEmbeddedVTableEntryUnchecked(
uint32_t i, ArtMethod* method, PointerSize pointer_size) {
SetFieldPtrWithSize</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
EmbeddedVTableEntryOffset(i, pointer_size), method, pointer_size);
}
inline void Class::SetEmbeddedVTableEntry(uint32_t i, ArtMethod* method, PointerSize pointer_size) {
ObjPtr<PointerArray> vtable = GetVTableDuringLinking();
CHECK_EQ(method, vtable->GetElementPtrSize<ArtMethod*>(i, pointer_size));
SetEmbeddedVTableEntryUnchecked(i, method, pointer_size);
}
inline bool Class::Implements(ObjPtr<Class> klass) {
DCHECK(klass != nullptr);
DCHECK(klass->IsInterface()) << PrettyClass();
// All interfaces implemented directly and by our superclass, and
// recursively all super-interfaces of those interfaces, are listed
// in iftable_, so we can just do a linear scan through that.
int32_t iftable_count = GetIfTableCount();
ObjPtr<IfTable> iftable = GetIfTable();
for (int32_t i = 0; i < iftable_count; i++) {
if (iftable->GetInterface(i) == klass) {
return true;
}
}
return false;
}
template<VerifyObjectFlags kVerifyFlags>
inline bool Class::IsVariableSize() {
// Classes, arrays, and strings vary in size, and so the object_size_ field cannot
// be used to Get their instance size
return IsClassClass<kVerifyFlags>() ||
IsArrayClass<kVerifyFlags>() ||
IsStringClass<kVerifyFlags>();
}
inline void Class::SetObjectSize(uint32_t new_object_size) {
DCHECK(!IsVariableSize());
// Not called within a transaction.
return SetField32<false>(OFFSET_OF_OBJECT_MEMBER(Class, object_size_), new_object_size);
}
template<typename T>
inline bool Class::IsDiscoverable(bool public_only,
const hiddenapi::AccessContext& access_context,
T* member) {
if (public_only && ((member->GetAccessFlags() & kAccPublic) == 0)) {
return false;
}
return !hiddenapi::ShouldDenyAccessToMember(
member, access_context, hiddenapi::AccessMethod::kNone);
}
// Determine whether "this" is assignable from "src", where both of these
// are array classes.
//
// Consider an array class, e.g. Y[][], where Y is a subclass of X.
// Y[][] = Y[][] --> true (identity)
// X[][] = Y[][] --> true (element superclass)
// Y = Y[][] --> false
// Y[] = Y[][] --> false
// Object = Y[][] --> true (everything is an object)
// Object[] = Y[][] --> true
// Object[][] = Y[][] --> true
// Object[][][] = Y[][] --> false (too many []s)
// Serializable = Y[][] --> true (all arrays are Serializable)
// Serializable[] = Y[][] --> true
// Serializable[][] = Y[][] --> false (unless Y is Serializable)
//
// Don't forget about primitive types.
// Object[] = int[] --> false
//
inline bool Class::IsArrayAssignableFromArray(ObjPtr<Class> src) {
DCHECK(IsArrayClass()) << PrettyClass();
DCHECK(src->IsArrayClass()) << src->PrettyClass();
return GetComponentType()->IsAssignableFrom(src->GetComponentType());
}
inline bool Class::IsAssignableFromArray(ObjPtr<Class> src) {
DCHECK(!IsInterface()) << PrettyClass(); // handled first in IsAssignableFrom
DCHECK(src->IsArrayClass()) << src->PrettyClass();
if (!IsArrayClass()) {
// If "this" is not also an array, it must be Object.
// src's super should be java_lang_Object, since it is an array.
ObjPtr<Class> java_lang_Object = src->GetSuperClass();
DCHECK(java_lang_Object != nullptr) << src->PrettyClass();
DCHECK(java_lang_Object->GetSuperClass() == nullptr) << src->PrettyClass();
return this == java_lang_Object;
}
return IsArrayAssignableFromArray(src);
}
template <bool throw_on_failure>
inline bool Class::ResolvedFieldAccessTest(ObjPtr<Class> access_to,
ArtField* field,
ObjPtr<DexCache> dex_cache,
uint32_t field_idx) {
DCHECK(dex_cache != nullptr);
if (UNLIKELY(!this->CanAccess(access_to))) {
// The referrer class can't access the field's declaring class but may still be able
// to access the field if the FieldId specifies an accessible subclass of the declaring
// class rather than the declaring class itself.
dex::TypeIndex class_idx = dex_cache->GetDexFile()->GetFieldId(field_idx).class_idx_;
// The referenced class has already been resolved with the field, but may not be in the dex
// cache. Use LookupResolveType here to search the class table if it is not in the dex cache.
// should be no thread suspension due to the class being resolved.
ObjPtr<Class> dex_access_to = Runtime::Current()->GetClassLinker()->LookupResolvedType(
class_idx,
dex_cache,
GetClassLoader());
DCHECK(dex_access_to != nullptr);
if (UNLIKELY(!this->CanAccess(dex_access_to))) {
if (throw_on_failure) {
ThrowIllegalAccessErrorClass(this, dex_access_to);
}
return false;
}
}
if (LIKELY(this->CanAccessMember(access_to, field->GetAccessFlags()))) {
return true;
}
if (throw_on_failure) {
ThrowIllegalAccessErrorField(this, field);
}
return false;
}
template <bool throw_on_failure>
inline bool Class::ResolvedMethodAccessTest(ObjPtr<Class> access_to,
ArtMethod* method,
ObjPtr<DexCache> dex_cache,
uint32_t method_idx,
InvokeType throw_invoke_type) {
DCHECK(throw_on_failure || throw_invoke_type == kStatic);
DCHECK(dex_cache != nullptr);
if (UNLIKELY(!this->CanAccess(access_to))) {
// The referrer class can't access the method's declaring class but may still be able
// to access the method if the MethodId specifies an accessible subclass of the declaring
// class rather than the declaring class itself.
dex::TypeIndex class_idx = dex_cache->GetDexFile()->GetMethodId(method_idx).class_idx_;
// The referenced class has already been resolved with the method, but may not be in the dex
// cache.
ObjPtr<Class> dex_access_to = Runtime::Current()->GetClassLinker()->LookupResolvedType(
class_idx,
dex_cache,
GetClassLoader());
DCHECK(dex_access_to != nullptr)
<< " Could not resolve " << dex_cache->GetDexFile()->StringByTypeIdx(class_idx)
<< " when checking access to " << method->PrettyMethod() << " from " << PrettyDescriptor();
if (UNLIKELY(!this->CanAccess(dex_access_to))) {
if (throw_on_failure) {
ThrowIllegalAccessErrorClassForMethodDispatch(this,
dex_access_to,
method,
throw_invoke_type);
}
return false;
}
}
if (LIKELY(this->CanAccessMember(access_to, method->GetAccessFlags()))) {
return true;
}
if (throw_on_failure) {
ThrowIllegalAccessErrorMethod(this, method);
}
return false;
}
inline bool Class::CanAccessResolvedField(ObjPtr<Class> access_to,
ArtField* field,
ObjPtr<DexCache> dex_cache,
uint32_t field_idx) {
return ResolvedFieldAccessTest<false>(access_to, field, dex_cache, field_idx);
}
inline bool Class::CheckResolvedFieldAccess(ObjPtr<Class> access_to,
ArtField* field,
ObjPtr<DexCache> dex_cache,
uint32_t field_idx) {
return ResolvedFieldAccessTest<true>(access_to, field, dex_cache, field_idx);
}
inline bool Class::CanAccessResolvedMethod(ObjPtr<Class> access_to,
ArtMethod* method,
ObjPtr<DexCache> dex_cache,
uint32_t method_idx) {
return ResolvedMethodAccessTest<false>(access_to, method, dex_cache, method_idx, kStatic);
}
inline bool Class::CheckResolvedMethodAccess(ObjPtr<Class> access_to,
ArtMethod* method,
ObjPtr<DexCache> dex_cache,
uint32_t method_idx,
InvokeType throw_invoke_type) {
return ResolvedMethodAccessTest<true>(
access_to, method, dex_cache, method_idx, throw_invoke_type);
}
inline bool Class::IsObsoleteVersionOf(ObjPtr<Class> klass) {
DCHECK(!klass->IsObsoleteObject()) << klass->PrettyClass() << " is obsolete!";
if (LIKELY(!IsObsoleteObject())) {
return false;
}
ObjPtr<Class> current(klass);
do {
if (UNLIKELY(current == this)) {
return true;
} else {
current = current->GetObsoleteClass();
}
} while (!current.IsNull());
return false;
}
inline bool Class::IsSubClass(ObjPtr<Class> klass) {
// Since the SubtypeCheck::IsSubtypeOf needs to lookup the Depth,
// it is always O(Depth) in terms of speed to do the check.
//
// So always do the "slow" linear scan in normal release builds.
//
// Future note: If we could have the depth in O(1) we could use the 'fast'
// method instead as it avoids a loop and a read barrier.
bool result = false;
DCHECK(!IsInterface()) << PrettyClass();
DCHECK(!IsArrayClass()) << PrettyClass();
ObjPtr<Class> current = this;
do {
if (current == klass) {
result = true;
break;
}
current = current->GetSuperClass();
} while (current != nullptr);
if (kIsDebugBuild && kBitstringSubtypeCheckEnabled) {
ObjPtr<mirror::Class> dis(this);
SubtypeCheckInfo::Result sc_result = SubtypeCheck<ObjPtr<Class>>::IsSubtypeOf(dis, klass);
if (sc_result != SubtypeCheckInfo::kUnknownSubtypeOf) {
// Note: The "kUnknownSubTypeOf" can be avoided if and only if:
// SubtypeCheck::EnsureInitialized(source)
// happens-before source.IsSubClass(target)
// SubtypeCheck::EnsureAssigned(target).GetState() == Assigned
// happens-before source.IsSubClass(target)
//
// When code generated by optimizing compiler executes this operation, both
// happens-before are guaranteed, so there is no fallback code there.
SubtypeCheckInfo::Result expected_result =
result ? SubtypeCheckInfo::kSubtypeOf : SubtypeCheckInfo::kNotSubtypeOf;
DCHECK_EQ(expected_result, sc_result)
<< "source: " << PrettyClass() << "target: " << klass->PrettyClass();
}
}
return result;
}
inline ArtMethod* Class::FindVirtualMethodForInterface(ArtMethod* method,
PointerSize pointer_size) {
ObjPtr<Class> declaring_class = method->GetDeclaringClass();
DCHECK(declaring_class != nullptr) << PrettyClass();
if (UNLIKELY(!declaring_class->IsInterface())) {
DCHECK(declaring_class->IsObjectClass()) << method->PrettyMethod();
DCHECK(method->IsPublic() && !method->IsStatic());
return FindVirtualMethodForVirtual(method, pointer_size);
}
DCHECK(!method->IsCopied());
// TODO cache to improve lookup speed
const int32_t iftable_count = GetIfTableCount();
ObjPtr<IfTable> iftable = GetIfTable();
for (int32_t i = 0; i < iftable_count; i++) {
if (iftable->GetInterface(i) == declaring_class) {
return iftable->GetMethodArray(i)->GetElementPtrSize<ArtMethod*>(
method->GetMethodIndex(), pointer_size);
}
}
return nullptr;
}
inline ArtMethod* Class::FindVirtualMethodForVirtual(ArtMethod* method, PointerSize pointer_size) {
// Only miranda or default methods may come from interfaces and be used as a virtual.
DCHECK(!method->GetDeclaringClass()->IsInterface() || method->IsDefault() || method->IsMiranda());
// The argument method may from a super class.
// Use the index to a potentially overridden one for this instance's class.
return GetVTableEntry(method->GetMethodIndex(), pointer_size);
}
inline ArtMethod* Class::FindVirtualMethodForSuper(ArtMethod* method, PointerSize pointer_size) {
DCHECK(!method->GetDeclaringClass()->IsInterface());
return GetSuperClass()->GetVTableEntry(method->GetMethodIndex(), pointer_size);
}
inline ArtMethod* Class::FindVirtualMethodForVirtualOrInterface(ArtMethod* method,
PointerSize pointer_size) {
if (method->IsDirect()) {
return method;
}
if (method->GetDeclaringClass()->IsInterface() && !method->IsCopied()) {
return FindVirtualMethodForInterface(method, pointer_size);
}
return FindVirtualMethodForVirtual(method, pointer_size);
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline ObjPtr<IfTable> Class::GetIfTable() {
ObjPtr<IfTable> ret = GetFieldObject<IfTable, kVerifyFlags, kReadBarrierOption>(IfTableOffset());
DCHECK(ret != nullptr) << PrettyClass(this);
return ret;
}
template<VerifyObjectFlags kVerifyFlags>
inline int32_t Class::GetIfTableCount() {
// We do not need a read barrier here as the length is constant,
// both from-space and to-space iftables shall yield the same result.
return GetIfTable<kVerifyFlags, kWithoutReadBarrier>()->Count();
}
inline void Class::SetIfTable(ObjPtr<IfTable> new_iftable) {
DCHECK(new_iftable != nullptr) << PrettyClass(this);
SetFieldObject</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
IfTableOffset(), new_iftable);
}
inline LengthPrefixedArray<ArtField>* Class::GetIFieldsPtr() {
DCHECK(IsLoaded() || IsErroneous()) << GetStatus();
return GetFieldPtr<LengthPrefixedArray<ArtField>*>(OFFSET_OF_OBJECT_MEMBER(Class, ifields_));
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline MemberOffset Class::GetFirstReferenceInstanceFieldOffset() {
ObjPtr<Class> super_class = GetSuperClass<kVerifyFlags, kReadBarrierOption>();
return (super_class != nullptr)
? MemberOffset(RoundUp(super_class->GetObjectSize<kVerifyFlags>(), kHeapReferenceSize))
: ClassOffset();
}
template <VerifyObjectFlags kVerifyFlags>
inline MemberOffset Class::GetFirstReferenceStaticFieldOffset(PointerSize pointer_size) {
DCHECK(IsResolved<kVerifyFlags>());
uint32_t base = sizeof(Class); // Static fields come after the class.
if (ShouldHaveEmbeddedVTable<kVerifyFlags>()) {
// Static fields come after the embedded tables.
base = Class::ComputeClassSize(
true, GetEmbeddedVTableLength<kVerifyFlags>(), 0, 0, 0, 0, 0, pointer_size);
}
return MemberOffset(base);
}
inline MemberOffset Class::GetFirstReferenceStaticFieldOffsetDuringLinking(
PointerSize pointer_size) {
DCHECK(IsLoaded());
uint32_t base = sizeof(Class); // Static fields come after the class.
if (ShouldHaveEmbeddedVTable()) {
// Static fields come after the embedded tables.
base = Class::ComputeClassSize(true, GetVTableDuringLinking()->GetLength(),
0, 0, 0, 0, 0, pointer_size);
}
return MemberOffset(base);
}
inline void Class::SetIFieldsPtr(LengthPrefixedArray<ArtField>* new_ifields) {
DCHECK(GetIFieldsPtrUnchecked() == nullptr);
return SetFieldPtr<false>(OFFSET_OF_OBJECT_MEMBER(Class, ifields_), new_ifields);
}
inline void Class::SetIFieldsPtrUnchecked(LengthPrefixedArray<ArtField>* new_ifields) {
SetFieldPtr<false, true, kVerifyNone>(OFFSET_OF_OBJECT_MEMBER(Class, ifields_), new_ifields);
}
inline LengthPrefixedArray<ArtField>* Class::GetSFieldsPtrUnchecked() {
return GetFieldPtr<LengthPrefixedArray<ArtField>*>(OFFSET_OF_OBJECT_MEMBER(Class, sfields_));
}
inline LengthPrefixedArray<ArtField>* Class::GetIFieldsPtrUnchecked() {
return GetFieldPtr<LengthPrefixedArray<ArtField>*>(OFFSET_OF_OBJECT_MEMBER(Class, ifields_));
}
inline LengthPrefixedArray<ArtField>* Class::GetSFieldsPtr() {
DCHECK(IsLoaded() || IsErroneous()) << GetStatus();
return GetSFieldsPtrUnchecked();
}
inline void Class::SetSFieldsPtr(LengthPrefixedArray<ArtField>* new_sfields) {
DCHECK((IsRetired() && new_sfields == nullptr) ||
GetFieldPtr<ArtField*>(OFFSET_OF_OBJECT_MEMBER(Class, sfields_)) == nullptr);
SetFieldPtr<false>(OFFSET_OF_OBJECT_MEMBER(Class, sfields_), new_sfields);
}
inline void Class::SetSFieldsPtrUnchecked(LengthPrefixedArray<ArtField>* new_sfields) {
SetFieldPtr<false, true, kVerifyNone>(OFFSET_OF_OBJECT_MEMBER(Class, sfields_), new_sfields);
}
inline ArtField* Class::GetStaticField(uint32_t i) {
return &GetSFieldsPtr()->At(i);
}
inline ArtField* Class::GetInstanceField(uint32_t i) {
return &GetIFieldsPtr()->At(i);
}
template<VerifyObjectFlags kVerifyFlags>
inline uint32_t Class::GetReferenceInstanceOffsets() {
DCHECK(IsResolved<kVerifyFlags>() || IsErroneous<kVerifyFlags>());
return GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, reference_instance_offsets_));
}
inline void Class::SetClinitThreadId(pid_t new_clinit_thread_id) {
SetField32Transaction(OFFSET_OF_OBJECT_MEMBER(Class, clinit_thread_id_), new_clinit_thread_id);
}
template<VerifyObjectFlags kVerifyFlags,
ReadBarrierOption kReadBarrierOption>
inline ObjPtr<String> Class::GetName() {
return GetFieldObject<String, kVerifyFlags, kReadBarrierOption>(
OFFSET_OF_OBJECT_MEMBER(Class, name_));
}
inline void Class::SetName(ObjPtr<String> name) {
SetFieldObjectTransaction(OFFSET_OF_OBJECT_MEMBER(Class, name_), name);
}
template<VerifyObjectFlags kVerifyFlags>
inline Primitive::Type Class::GetPrimitiveType() {
static_assert(sizeof(Primitive::Type) == sizeof(int32_t),
"art::Primitive::Type and int32_t have different sizes.");
int32_t v32 = GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, primitive_type_));
Primitive::Type type = static_cast<Primitive::Type>(v32 & kPrimitiveTypeMask);
DCHECK_EQ(static_cast<size_t>(v32 >> kPrimitiveTypeSizeShiftShift),
Primitive::ComponentSizeShift(type));
return type;
}
template<VerifyObjectFlags kVerifyFlags>
inline size_t Class::GetPrimitiveTypeSizeShift() {
static_assert(sizeof(Primitive::Type) == sizeof(int32_t),
"art::Primitive::Type and int32_t have different sizes.");
int32_t v32 = GetField32<kVerifyFlags>(OFFSET_OF_OBJECT_MEMBER(Class, primitive_type_));
size_t size_shift = static_cast<Primitive::Type>(v32 >> kPrimitiveTypeSizeShiftShift);
DCHECK_EQ(size_shift,
Primitive::ComponentSizeShift(static_cast<Primitive::Type>(v32 & kPrimitiveTypeMask)));
return size_shift;
}
inline uint32_t Class::ComputeClassSize(bool has_embedded_vtable,
uint32_t num_vtable_entries,
uint32_t num_8bit_static_fields,
uint32_t num_16bit_static_fields,
uint32_t num_32bit_static_fields,
uint32_t num_64bit_static_fields,
uint32_t num_ref_static_fields,
PointerSize pointer_size) {
// Space used by java.lang.Class and its instance fields.
uint32_t size = sizeof(Class);
// Space used by embedded tables.
if (has_embedded_vtable) {
size = RoundUp(size + sizeof(uint32_t), static_cast<size_t>(pointer_size));
size += static_cast<size_t>(pointer_size); // size of pointer to IMT
size += num_vtable_entries * VTableEntrySize(pointer_size);
}
// Space used by reference statics.
size += num_ref_static_fields * kHeapReferenceSize;
if (!IsAligned<8>(size) && num_64bit_static_fields > 0) {
uint32_t gap = 8 - (size & 0x7);
size += gap; // will be padded
// Shuffle 4-byte fields forward.
while (gap >= sizeof(uint32_t) && num_32bit_static_fields != 0) {
--num_32bit_static_fields;
gap -= sizeof(uint32_t);
}
// Shuffle 2-byte fields forward.
while (gap >= sizeof(uint16_t) && num_16bit_static_fields != 0) {
--num_16bit_static_fields;
gap -= sizeof(uint16_t);
}
// Shuffle byte fields forward.
while (gap >= sizeof(uint8_t) && num_8bit_static_fields != 0) {
--num_8bit_static_fields;
gap -= sizeof(uint8_t);
}
}
// Guaranteed to be at least 4 byte aligned. No need for further alignments.
// Space used for primitive static fields.
size += num_8bit_static_fields * sizeof(uint8_t) + num_16bit_static_fields * sizeof(uint16_t) +
num_32bit_static_fields * sizeof(uint32_t) + num_64bit_static_fields * sizeof(uint64_t);
return size;
}
template<VerifyObjectFlags kVerifyFlags>
inline bool Class::IsClassClass() {
// OK to look at from-space copies since java.lang.Class.class is non-moveable
// (even when running without boot image, see ClassLinker::InitWithoutImage())
// and we're reading it for comparison only. See ReadBarrierOption.
ObjPtr<Class> java_lang_Class = GetClass<kVerifyFlags, kWithoutReadBarrier>();
return this == java_lang_Class;
}
inline const DexFile& Class::GetDexFile() {
// From-space version is the same as the to-space version since the dex file never changes.
// Avoiding the read barrier here is important to prevent recursive AssertToSpaceInvariant issues
// from PrettyTypeOf.
return *GetDexCache<kDefaultVerifyFlags, kWithoutReadBarrier>()->GetDexFile();
}
inline bool Class::DescriptorEquals(const char* match) {
ObjPtr<mirror::Class> klass = this;
while (klass->IsArrayClass()) {
if (match[0] != '[') {
return false;
}
++match;
// No read barrier needed, we're reading a chain of constant references for comparison
// with null. Then we follow up below with reading constant references to read constant
// primitive data in both proxy and non-proxy paths. See ReadBarrierOption.
klass = klass->GetComponentType<kDefaultVerifyFlags, kWithoutReadBarrier>();
}
if (klass->IsPrimitive()) {
return strcmp(Primitive::Descriptor(klass->GetPrimitiveType()), match) == 0;
} else if (klass->IsProxyClass()) {
return klass->ProxyDescriptorEquals(match);
} else {
const DexFile& dex_file = klass->GetDexFile();
const dex::TypeId& type_id = dex_file.GetTypeId(klass->GetDexTypeIndex());
return strcmp(dex_file.GetTypeDescriptor(type_id), match) == 0;
}
}
inline uint32_t Class::DescriptorHash() {
// No read barriers needed, we're reading a chain of constant references for comparison with null
// and retrieval of constant primitive data. See `ReadBarrierOption` and `Class::GetDescriptor()`.
ObjPtr<mirror::Class> klass = this;
uint32_t hash = StartModifiedUtf8Hash();
while (klass->IsArrayClass()) {
klass = klass->GetComponentType<kDefaultVerifyFlags, kWithoutReadBarrier>();
hash = UpdateModifiedUtf8Hash(hash, '[');
}
if (UNLIKELY(klass->IsProxyClass())) {
hash = UpdateHashForProxyClass(hash, klass);
} else if (klass->IsPrimitive()) {
hash = UpdateModifiedUtf8Hash(hash, Primitive::Descriptor(klass->GetPrimitiveType())[0]);
} else {
const DexFile& dex_file = klass->GetDexFile();
const dex::TypeId& type_id = dex_file.GetTypeId(klass->GetDexTypeIndex());
std::string_view descriptor = dex_file.GetTypeDescriptorView(type_id);
hash = UpdateModifiedUtf8Hash(hash, descriptor);
}
if (kIsDebugBuild) {
std::string temp;
CHECK_EQ(hash, ComputeModifiedUtf8Hash(GetDescriptor(&temp)));
}
return hash;
}
inline void Class::AssertInitializedOrInitializingInThread(Thread* self) {
if (kIsDebugBuild && !IsInitialized()) {
CHECK(IsInitializing()) << PrettyClass() << " is not initializing: " << GetStatus();
CHECK_EQ(GetClinitThreadId(), self->GetTid())
<< PrettyClass() << " is initializing in a different thread";
}
}
inline ObjPtr<ObjectArray<Class>> Class::GetProxyInterfaces() {
CHECK(IsProxyClass());
// First static field.
ArtField* field = GetStaticField(0);
DCHECK_STREQ(field->GetName(), "interfaces");
MemberOffset field_offset = field->GetOffset();
return GetFieldObject<ObjectArray<Class>>(field_offset);
}
inline ObjPtr<ObjectArray<ObjectArray<Class>>> Class::GetProxyThrows() {
CHECK(IsProxyClass());
// Second static field.
ArtField* field = GetStaticField(1);
DCHECK_STREQ(field->GetName(), "throws");
MemberOffset field_offset = field->GetOffset();
return GetFieldObject<ObjectArray<ObjectArray<Class>>>(field_offset);
}
inline bool Class::IsBootStrapClassLoaded() {
// No read barrier is needed for comparing with null. See ReadBarrierOption.
return GetClassLoader<kDefaultVerifyFlags, kWithoutReadBarrier>() == nullptr;
}
inline void Class::InitializeClassVisitor::operator()(ObjPtr<Object> obj,
size_t usable_size) const {
DCHECK_LE(class_size_, usable_size);
// Avoid AsClass as object is not yet in live bitmap or allocation stack.
ObjPtr<Class> klass = ObjPtr<Class>::DownCast(obj);
klass->SetClassSize(class_size_);
klass->SetPrimitiveType(Primitive::kPrimNot); // Default to not being primitive.
klass->SetDexClassDefIndex(DexFile::kDexNoIndex16); // Default to no valid class def index.
klass->SetDexTypeIndex(dex::TypeIndex(DexFile::kDexNoIndex16)); // Default to no valid type
// index.
// Default to force slow path until visibly initialized.
// There is no need for release store (volatile) in pre-fence visitor.
klass->SetField32</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
ObjectSizeAllocFastPathOffset(), std::numeric_limits<uint32_t>::max());
}
inline void Class::SetAccessFlagsDuringLinking(uint32_t new_access_flags) {
SetField32</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
AccessFlagsOffset(), new_access_flags);
}
inline void Class::SetAccessFlags(uint32_t new_access_flags) {
// Called inside a transaction when setting pre-verified flag during boot image compilation.
if (Runtime::Current()->IsActiveTransaction()) {
SetField32<true>(AccessFlagsOffset(), new_access_flags);
} else {
SetField32<false>(AccessFlagsOffset(), new_access_flags);
}
}
inline void Class::SetClassFlags(uint32_t new_flags) {
SetField32</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
OFFSET_OF_OBJECT_MEMBER(Class, class_flags_), new_flags);
}
inline uint32_t Class::NumDirectInterfaces() {
if (IsPrimitive()) {
return 0;
} else if (IsArrayClass()) {
return 2;
} else if (IsProxyClass()) {
ObjPtr<ObjectArray<Class>> interfaces = GetProxyInterfaces();
return interfaces != nullptr ? interfaces->GetLength() : 0;
} else {
const dex::TypeList* interfaces = GetInterfaceTypeList();
if (interfaces == nullptr) {
return 0;
} else {
return interfaces->Size();
}
}
}
inline ArraySlice<ArtMethod> Class::GetDirectMethods(PointerSize pointer_size) {
CheckPointerSize(pointer_size);
return GetDirectMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetDeclaredMethods(PointerSize pointer_size) {
return GetDeclaredMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetDeclaredVirtualMethods(PointerSize pointer_size) {
return GetDeclaredVirtualMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetVirtualMethods(PointerSize pointer_size) {
CheckPointerSize(pointer_size);
return GetVirtualMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetCopiedMethods(PointerSize pointer_size) {
CheckPointerSize(pointer_size);
return GetCopiedMethodsSliceUnchecked(pointer_size);
}
inline ArraySlice<ArtMethod> Class::GetMethods(PointerSize pointer_size) {
CheckPointerSize(pointer_size);
LengthPrefixedArray<ArtMethod>* methods = GetMethodsPtr();
return GetMethodsSliceRangeUnchecked(methods, pointer_size, 0u, NumMethods(methods));
}
inline IterationRange<StrideIterator<ArtField>> Class::GetIFields() {
return MakeIterationRangeFromLengthPrefixedArray(GetIFieldsPtr());
}
inline IterationRange<StrideIterator<ArtField>> Class::GetSFields() {
return MakeIterationRangeFromLengthPrefixedArray(GetSFieldsPtr());
}
inline IterationRange<StrideIterator<ArtField>> Class::GetIFieldsUnchecked() {
return MakeIterationRangeFromLengthPrefixedArray(GetIFieldsPtrUnchecked());
}
inline IterationRange<StrideIterator<ArtField>> Class::GetSFieldsUnchecked() {
return MakeIterationRangeFromLengthPrefixedArray(GetSFieldsPtrUnchecked());
}
inline void Class::CheckPointerSize(PointerSize pointer_size) {
DCHECK_EQ(pointer_size, Runtime::Current()->GetClassLinker()->GetImagePointerSize());
}
template<VerifyObjectFlags kVerifyFlags, ReadBarrierOption kReadBarrierOption>
inline ObjPtr<Class> Class::GetComponentType() {
return GetFieldObject<Class, kVerifyFlags, kReadBarrierOption>(ComponentTypeOffset());
}
inline void Class::SetComponentType(ObjPtr<Class> new_component_type) {
DCHECK(GetComponentType() == nullptr);
DCHECK(new_component_type != nullptr);
// Component type is invariant: use non-transactional mode without check.
SetFieldObject</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
ComponentTypeOffset(), new_component_type);
}
inline size_t Class::GetComponentSize() {
return 1U << GetComponentSizeShift();
}
inline size_t Class::GetComponentSizeShift() {
// No read barrier is needed for reading a constant primitive field through
// constant reference field. See ReadBarrierOption.
return GetComponentType<kDefaultVerifyFlags, kWithoutReadBarrier>()->GetPrimitiveTypeSizeShift();
}
inline bool Class::IsObjectClass() {
// No read barrier is needed for comparing with null. See ReadBarrierOption.
return !IsPrimitive() && GetSuperClass<kDefaultVerifyFlags, kWithoutReadBarrier>() == nullptr;
}
inline bool Class::IsInstantiableNonArray() {
return !IsPrimitive() && !IsInterface() && !IsAbstract() && !IsArrayClass();
}
template<VerifyObjectFlags kVerifyFlags>
bool Class::IsInstantiable() {
return (!IsPrimitive<kVerifyFlags>() &&
!IsInterface<kVerifyFlags>() &&
!IsAbstract<kVerifyFlags>()) ||
(IsAbstract<kVerifyFlags>() && IsArrayClass<kVerifyFlags>());
}
template<VerifyObjectFlags kVerifyFlags>
inline bool Class::IsArrayClass() {
// We do not need a read barrier for comparing with null.
return GetComponentType<kVerifyFlags, kWithoutReadBarrier>() != nullptr;
}
template<VerifyObjectFlags kVerifyFlags>
inline bool Class::IsObjectArrayClass() {
// We do not need a read barrier here as the primitive type is constant,
// both from-space and to-space component type classes shall yield the same result.
const ObjPtr<Class> component_type = GetComponentType<kVerifyFlags, kWithoutReadBarrier>();
constexpr VerifyObjectFlags kNewFlags = RemoveThisFlags(kVerifyFlags);
return component_type != nullptr && !component_type->IsPrimitive<kNewFlags>();
}
template<VerifyObjectFlags kVerifyFlags>
bool Class::IsPrimitiveArray() {
// We do not need a read barrier here as the primitive type is constant,
// both from-space and to-space component type classes shall yield the same result.
const ObjPtr<Class> component_type = GetComponentType<kVerifyFlags, kWithoutReadBarrier>();
constexpr VerifyObjectFlags kNewFlags = RemoveThisFlags(kVerifyFlags);
return component_type != nullptr && component_type->IsPrimitive<kNewFlags>();
}
inline bool Class::IsAssignableFrom(ObjPtr<Class> src) {
DCHECK(src != nullptr);
if (this == src) {
// Can always assign to things of the same type.
return true;
} else if (IsObjectClass()) {
// Can assign any reference to java.lang.Object.
return !src->IsPrimitive();
} else if (IsInterface()) {
return src->Implements(this);
} else if (src->IsArrayClass()) {
return IsAssignableFromArray(src);
} else {
return !src->IsInterface() && src->IsSubClass(this);
}
}
inline uint32_t Class::NumDirectMethods() {
return GetVirtualMethodsStartOffset();
}
inline uint32_t Class::NumDeclaredVirtualMethods() {
return GetCopiedMethodsStartOffset() - GetVirtualMethodsStartOffset();
}
inline uint32_t Class::NumVirtualMethods() {
return NumMethods() - GetVirtualMethodsStartOffset();
}
inline uint32_t Class::NumInstanceFields() {
LengthPrefixedArray<ArtField>* arr = GetIFieldsPtrUnchecked();
return arr != nullptr ? arr->size() : 0u;
}
inline uint32_t Class::NumStaticFields() {
LengthPrefixedArray<ArtField>* arr = GetSFieldsPtrUnchecked();
return arr != nullptr ? arr->size() : 0u;
}
template <typename T, VerifyObjectFlags kVerifyFlags, typename Visitor>
inline void Class::FixupNativePointer(
Class* dest, PointerSize pointer_size, const Visitor& visitor, MemberOffset member_offset) {
void** address =
reinterpret_cast<void**>(reinterpret_cast<uintptr_t>(dest) + member_offset.Uint32Value());
T old_value = GetFieldPtrWithSize<T, kVerifyFlags>(member_offset, pointer_size);
T new_value = visitor(old_value, address);
if (old_value != new_value) {
dest->SetFieldPtrWithSize</* kTransactionActive= */ false,
/* kCheckTransaction= */ true,
kVerifyNone>(member_offset, new_value, pointer_size);
}
}
template <VerifyObjectFlags kVerifyFlags, typename Visitor>
inline void Class::FixupNativePointers(Class* dest,
PointerSize pointer_size,
const Visitor& visitor) {
// Update the field arrays.
FixupNativePointer<LengthPrefixedArray<ArtField>*, kVerifyFlags>(
dest, pointer_size, visitor, OFFSET_OF_OBJECT_MEMBER(Class, sfields_));
FixupNativePointer<LengthPrefixedArray<ArtField>*, kVerifyFlags>(
dest, pointer_size, visitor, OFFSET_OF_OBJECT_MEMBER(Class, ifields_));
// Update method array.
FixupNativePointer<LengthPrefixedArray<ArtMethod>*, kVerifyFlags>(
dest, pointer_size, visitor, OFFSET_OF_OBJECT_MEMBER(Class, methods_));
// Fix up embedded tables.
if (!IsTemp<kVerifyNone>() && ShouldHaveEmbeddedVTable<kVerifyNone>()) {
for (int32_t i = 0, count = GetEmbeddedVTableLength<kVerifyFlags>(); i < count; ++i) {
FixupNativePointer<ArtMethod*, kVerifyFlags>(
dest, pointer_size, visitor, EmbeddedVTableEntryOffset(i, pointer_size));
}
}
if (!IsTemp<kVerifyNone>() && ShouldHaveImt<kVerifyNone>()) {
FixupNativePointer<ImTable*, kVerifyFlags>(
dest, pointer_size, visitor, ImtPtrOffset(pointer_size));
}
}
inline bool Class::CanAccess(ObjPtr<Class> that) {
return that->IsPublic() || this->IsInSamePackage(that);
}
inline bool Class::CanAccessMember(ObjPtr<Class> access_to, uint32_t member_flags) {
// Classes can access all of their own members
if (this == access_to) {
return true;
}
// Public members are trivially accessible
if (member_flags & kAccPublic) {
return true;
}
// Private members are trivially not accessible
if (member_flags & kAccPrivate) {
return false;
}
// Check for protected access from a sub-class, which may or may not be in the same package.
if (member_flags & kAccProtected) {
if (!this->IsInterface() && this->IsSubClass(access_to)) {
return true;
}
}
// Allow protected access from other classes in the same package.
return this->IsInSamePackage(access_to);
}
inline bool Class::CannotBeAssignedFromOtherTypes() {
if (!IsArrayClass()) {
return IsFinal();
}
ObjPtr<Class> component = GetComponentType();
return component->IsPrimitive() || component->CannotBeAssignedFromOtherTypes();
}
inline void Class::SetClassLoader(ObjPtr<ClassLoader> new_class_loader) {
SetFieldObject</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
OFFSET_OF_OBJECT_MEMBER(Class, class_loader_), new_class_loader);
}
inline void Class::SetRecursivelyInitialized() {
DCHECK_EQ(GetLockOwnerThreadId(), Thread::Current()->GetThreadId());
uint32_t flags = GetField32(OFFSET_OF_OBJECT_MEMBER(Class, access_flags_));
SetAccessFlags(flags | kAccRecursivelyInitialized);
}
inline void Class::SetHasDefaultMethods() {
DCHECK_EQ(GetLockOwnerThreadId(), Thread::Current()->GetThreadId());
uint32_t flags = GetField32(OFFSET_OF_OBJECT_MEMBER(Class, access_flags_));
SetAccessFlagsDuringLinking(flags | kAccHasDefaultMethod);
}
} // namespace mirror
} // namespace art
#endif // ART_RUNTIME_MIRROR_CLASS_INL_H_
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