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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_OBJECT_REFVISITOR_INL_H_
#define ART_RUNTIME_MIRROR_OBJECT_REFVISITOR_INL_H_
#include "object-inl.h"
#include "class-refvisitor-inl.h"
#include "class_loader-inl.h"
#include "dex_cache-inl.h"
namespace art HIDDEN {
namespace mirror {
template <VerifyObjectFlags kVerifyFlags,
ReadBarrierOption kReadBarrierOption>
static void CheckNoReferenceField(ObjPtr<mirror::Class> klass)
REQUIRES_SHARED(art::Locks::mutator_lock_) {
if (!kIsDebugBuild) {
return;
}
CHECK(!klass->IsClassClass<kVerifyFlags>());
CHECK((!klass->IsObjectArrayClass<kVerifyFlags, kReadBarrierOption>()));
// String still has instance fields for reflection purposes but these don't exist in
// actual string instances.
if (!klass->IsStringClass<kVerifyFlags>()) {
size_t total_reference_instance_fields = 0;
ObjPtr<Class> super_class = klass;
do {
total_reference_instance_fields +=
super_class->NumReferenceInstanceFields<kVerifyFlags>();
super_class = super_class->GetSuperClass<kVerifyFlags, kReadBarrierOption>();
} while (super_class != nullptr);
// The only reference field should be the object's class.
CHECK_EQ(total_reference_instance_fields, 1u);
}
}
template <VerifyObjectFlags kVerifyFlags>
static void CheckNormalClass(ObjPtr<mirror::Class> klass)
REQUIRES_SHARED(art::Locks::mutator_lock_) {
DCHECK(!klass->IsVariableSize<kVerifyFlags>());
DCHECK(!klass->IsClassClass<kVerifyFlags>());
DCHECK(!klass->IsStringClass<kVerifyFlags>());
DCHECK(!klass->IsClassLoaderClass<kVerifyFlags>());
DCHECK(!klass->IsArrayClass<kVerifyFlags>());
}
template <bool kVisitNativeRoots,
VerifyObjectFlags kVerifyFlags,
ReadBarrierOption kReadBarrierOption,
typename Visitor,
typename JavaLangRefVisitor>
inline void Object::VisitReferences(const Visitor& visitor,
const JavaLangRefVisitor& ref_visitor) {
visitor(this, ClassOffset(), /* is_static= */ false);
ObjPtr<Class> klass = GetClass<kVerifyFlags, kReadBarrierOption>();
const uint32_t class_flags = klass->GetClassFlags<kVerifyNone>();
if (LIKELY(class_flags == kClassFlagNormal) || class_flags == kClassFlagRecord) {
CheckNormalClass<kVerifyFlags>(klass);
DCHECK(klass->IsInstantiableNonArray()) << klass->PrettyDescriptor();
VisitInstanceFieldsReferences<kVerifyFlags, kReadBarrierOption>(klass, visitor);
return;
}
if ((class_flags & kClassFlagNoReferenceFields) != 0) {
CheckNoReferenceField<kVerifyFlags, kReadBarrierOption>(klass);
return;
}
DCHECK(!klass->IsStringClass<kVerifyFlags>());
if (class_flags == kClassFlagClass) {
DCHECK(klass->IsClassClass<kVerifyFlags>());
DCHECK(klass->IsInstantiableNonArray()) << klass->PrettyDescriptor();
ObjPtr<Class> as_klass = AsClass<kVerifyNone>();
as_klass->VisitReferences<kVisitNativeRoots, kVerifyFlags, kReadBarrierOption>(klass, visitor);
return;
}
if ((class_flags & kClassFlagObjectArray) != 0) {
DCHECK((klass->IsObjectArrayClass<kVerifyFlags, kReadBarrierOption>()));
AsObjectArray<mirror::Object, kVerifyNone>()->VisitReferences(visitor);
return;
}
if ((class_flags & kClassFlagReference) != 0) {
DCHECK(klass->IsInstantiableNonArray()) << klass->PrettyDescriptor();
VisitInstanceFieldsReferences<kVerifyFlags, kReadBarrierOption>(klass, visitor);
ref_visitor(klass, AsReference<kVerifyFlags, kReadBarrierOption>());
return;
}
if (class_flags == kClassFlagDexCache) {
DCHECK(klass->IsInstantiableNonArray()) << klass->PrettyDescriptor();
DCHECK(klass->IsDexCacheClass<kVerifyFlags>());
ObjPtr<mirror::DexCache> const dex_cache = AsDexCache<kVerifyFlags, kReadBarrierOption>();
dex_cache->VisitReferences<kVisitNativeRoots,
kVerifyFlags,
kReadBarrierOption>(klass, visitor);
return;
}
if (class_flags == kClassFlagClassLoader) {
DCHECK(klass->IsInstantiableNonArray()) << klass->PrettyDescriptor();
DCHECK(klass->IsClassLoaderClass<kVerifyFlags>());
ObjPtr<mirror::ClassLoader> const class_loader =
AsClassLoader<kVerifyFlags, kReadBarrierOption>();
class_loader->VisitReferences<kVisitNativeRoots,
kVerifyFlags,
kReadBarrierOption>(klass, visitor);
return;
}
LOG(FATAL) << "Unexpected class flags: " << std::hex << class_flags
<< " for " << klass->PrettyClass();
}
// Could be called with from-space address of the object as we access klass and
// length (in case of arrays/strings) and we don't want to cause cascading faults.
template <bool kFetchObjSize,
bool kVisitNativeRoots,
VerifyObjectFlags kVerifyFlags,
ReadBarrierOption kReadBarrierOption,
typename Visitor>
inline size_t Object::VisitRefsForCompaction(const Visitor& visitor,
MemberOffset begin,
MemberOffset end) {
constexpr VerifyObjectFlags kSizeOfFlags = RemoveThisFlags(kVerifyFlags);
size_t size;
// We want to continue using pre-compact klass to avoid cascading faults.
ObjPtr<Class> klass = GetClass<kVerifyFlags, kReadBarrierOption>();
DCHECK(klass != nullptr) << "obj=" << this;
const uint32_t class_flags = klass->GetClassFlags<kVerifyNone>();
if (LIKELY(class_flags == kClassFlagNormal) || class_flags == kClassFlagRecord) {
CheckNormalClass<kVerifyFlags>(klass);
VisitInstanceFieldsReferences<kVerifyFlags, kReadBarrierOption>(klass, visitor);
size = kFetchObjSize ? klass->GetObjectSize<kSizeOfFlags>() : 0;
} else if ((class_flags & kClassFlagNoReferenceFields) != 0) {
if ((class_flags & kClassFlagString) != 0) {
size = kFetchObjSize ? static_cast<String*>(this)->SizeOf<kSizeOfFlags>() : 0;
} else if ((class_flags & kClassFlagPrimitiveArray) != 0) {
ObjPtr<Array> arr = ObjPtr<Array>::DownCast(this);
size = kFetchObjSize ?
arr->SizeOf<kSizeOfFlags>(class_flags >> kArrayComponentSizeShiftShift) :
0;
} else {
// Only possibility left is of a normal klass instance with no references.
size = kFetchObjSize ? klass->GetObjectSize<kSizeOfFlags>() : 0;
}
} else if (class_flags == kClassFlagClass) {
DCHECK(klass->IsClassClass<kVerifyFlags>());
ObjPtr<Class> as_klass = ObjPtr<Class>::DownCast(this);
as_klass->VisitReferences<kVisitNativeRoots, kVerifyFlags, kReadBarrierOption>(klass,
visitor);
size = kFetchObjSize ? as_klass->SizeOf<kSizeOfFlags>() : 0;
} else if ((class_flags & kClassFlagObjectArray) != 0) {
ObjPtr<ObjectArray<Object>> obj_arr = ObjPtr<ObjectArray<Object>>::DownCast(this);
obj_arr->VisitReferences(visitor, begin, end);
size = kFetchObjSize ?
obj_arr->SizeOf<kSizeOfFlags>(class_flags >> kArrayComponentSizeShiftShift) :
0;
} else if ((class_flags & kClassFlagReference) != 0) {
VisitInstanceFieldsReferences<kVerifyFlags, kReadBarrierOption>(klass, visitor);
// Visit referent also as this is about updating the reference only.
// There is no reference processing happening here.
visitor(this, mirror::Reference::ReferentOffset(), /* is_static= */ false);
size = kFetchObjSize ? klass->GetObjectSize<kSizeOfFlags>() : 0;
} else if (class_flags == kClassFlagDexCache) {
DCHECK(klass->IsDexCacheClass<kVerifyFlags>());
ObjPtr<DexCache> const dex_cache = ObjPtr<DexCache>::DownCast(this);
dex_cache->VisitReferences<kVisitNativeRoots,
kVerifyFlags,
kReadBarrierOption>(klass, visitor);
size = kFetchObjSize ? klass->GetObjectSize<kSizeOfFlags>() : 0;
} else if (class_flags == kClassFlagClassLoader) {
DCHECK(klass->IsClassLoaderClass<kVerifyFlags>());
ObjPtr<ClassLoader> const class_loader = ObjPtr<ClassLoader>::DownCast(this);
class_loader->VisitReferences<kVisitNativeRoots,
kVerifyFlags,
kReadBarrierOption>(klass, visitor);
size = kFetchObjSize ? klass->GetObjectSize<kSizeOfFlags>() : 0;
} else {
LOG(FATAL) << "Unexpected class flags: " << std::hex << class_flags
<< " for " << klass->PrettyClass();
size = -1;
}
visitor(this, ClassOffset(), /* is_static= */ false);
return size;
}
} // namespace mirror
} // namespace art
#endif // ART_RUNTIME_MIRROR_OBJECT_REFVISITOR_INL_H_
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