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/*
* Copyright (C) 2016 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_OBJ_PTR_INL_H_
#define ART_RUNTIME_OBJ_PTR_INL_H_
#include <ostream>
#include "base/bit_utils.h"
#include "obj_ptr.h"
#include "thread-current-inl.h"
namespace art {
template<class MirrorType>
inline uintptr_t ObjPtr<MirrorType>::GetCurrentTrimedCookie() {
Thread* self = Thread::Current();
if (UNLIKELY(self == nullptr)) {
return kCookieMask;
}
return self->GetPoisonObjectCookie() & kCookieMask;
}
template<class MirrorType>
inline bool ObjPtr<MirrorType>::IsValid() const {
if (!kObjPtrPoisoning || IsNull()) {
return true;
}
return GetCookie() == GetCurrentTrimedCookie();
}
template<class MirrorType>
inline void ObjPtr<MirrorType>::AssertValid() const {
if (kObjPtrPoisoning) {
CHECK(IsValid()) << "Stale object pointer " << PtrUnchecked() << " , expected cookie "
<< GetCurrentTrimedCookie() << " but got " << GetCookie();
}
}
template<class MirrorType>
inline uintptr_t ObjPtr<MirrorType>::Encode(MirrorType* ptr) {
uintptr_t ref = reinterpret_cast<uintptr_t>(ptr);
DCHECK_ALIGNED(ref, kObjectAlignment);
if (kObjPtrPoisoning && ref != 0) {
DCHECK_LE(ref, 0xFFFFFFFFU);
ref >>= kObjectAlignmentShift;
// Put cookie in high bits.
ref |= GetCurrentTrimedCookie() << kCookieShift;
}
return ref;
}
template<class MirrorType>
template <typename Type,
typename /* = typename std::enable_if_t<std::is_base_of_v<MirrorType, Type>> */>
inline ObjPtr<MirrorType>::ObjPtr(Type* ptr)
: reference_(Encode(static_cast<MirrorType*>(ptr))) {
}
template<class MirrorType>
template <typename Type,
typename /* = typename std::enable_if_t<std::is_base_of_v<MirrorType, Type>> */>
inline ObjPtr<MirrorType>::ObjPtr(const ObjPtr<Type>& other)
: reference_(other.reference_) {
if (kObjPtrPoisoningValidateOnCopy) {
AssertValid();
}
}
template<class MirrorType>
template <typename Type,
typename /* = typename std::enable_if_t<std::is_base_of_v<MirrorType, Type>> */>
inline ObjPtr<MirrorType>& ObjPtr<MirrorType>::operator=(const ObjPtr<Type>& other) {
reference_ = other.reference_;
if (kObjPtrPoisoningValidateOnCopy) {
AssertValid();
}
return *this;
}
template<class MirrorType>
OBJPTR_INLINE ObjPtr<MirrorType>& ObjPtr<MirrorType>::operator=(MirrorType* ptr) {
Assign(ptr);
return *this;
}
template<class MirrorType>
inline void ObjPtr<MirrorType>::Assign(MirrorType* ptr) {
reference_ = Encode(ptr);
}
template<class MirrorType>
inline MirrorType* ObjPtr<MirrorType>::operator->() const {
return Ptr();
}
template<class MirrorType>
inline MirrorType* ObjPtr<MirrorType>::Ptr() const {
AssertValid();
return PtrUnchecked();
}
template<class MirrorType>
template <typename SourceType>
inline ObjPtr<MirrorType> ObjPtr<MirrorType>::DownCast(ObjPtr<SourceType> ptr) {
static_assert(std::is_base_of_v<SourceType, MirrorType>,
"Target type must be a subtype of source type");
return static_cast<MirrorType*>(ptr.Ptr());
}
template<class MirrorType>
template <typename SourceType>
inline ObjPtr<MirrorType> ObjPtr<MirrorType>::DownCast(SourceType* ptr) {
static_assert(std::is_base_of_v<SourceType, MirrorType>,
"Target type must be a subtype of source type");
return static_cast<MirrorType*>(ptr);
}
template<class MirrorType>
size_t HashObjPtr::operator()(const ObjPtr<MirrorType>& ptr) const {
return std::hash<MirrorType*>()(ptr.Ptr());
}
template<class MirrorType1, class MirrorType2>
inline std::enable_if_t<std::is_base_of_v<MirrorType1, MirrorType2> ||
std::is_base_of_v<MirrorType2, MirrorType1>, bool>
operator==(ObjPtr<MirrorType1> lhs, ObjPtr<MirrorType2> rhs) {
return lhs.Ptr() == rhs.Ptr();
}
template<class MirrorType1, class MirrorType2>
inline std::enable_if_t<std::is_base_of_v<MirrorType1, MirrorType2> ||
std::is_base_of_v<MirrorType2, MirrorType1>, bool>
operator==(const MirrorType1* lhs, ObjPtr<MirrorType2> rhs) {
return lhs == rhs.Ptr();
}
template<class MirrorType1, class MirrorType2>
inline std::enable_if_t<std::is_base_of_v<MirrorType1, MirrorType2> ||
std::is_base_of_v<MirrorType2, MirrorType1>, bool>
operator==(ObjPtr<MirrorType1> lhs, const MirrorType2* rhs) {
return lhs.Ptr() == rhs;
}
template<class MirrorType1, class MirrorType2>
inline std::enable_if_t<std::is_base_of_v<MirrorType1, MirrorType2> ||
std::is_base_of_v<MirrorType2, MirrorType1>, bool>
operator!=(ObjPtr<MirrorType1> lhs, ObjPtr<MirrorType2> rhs) {
return !(lhs == rhs);
}
template<class MirrorType1, class MirrorType2>
inline std::enable_if_t<std::is_base_of_v<MirrorType1, MirrorType2> ||
std::is_base_of_v<MirrorType2, MirrorType1>, bool>
operator!=(const MirrorType1* lhs, ObjPtr<MirrorType2> rhs) {
return !(lhs == rhs);
}
template<class MirrorType1, class MirrorType2>
inline std::enable_if_t<std::is_base_of_v<MirrorType1, MirrorType2> ||
std::is_base_of_v<MirrorType2, MirrorType1>, bool>
operator!=(ObjPtr<MirrorType1> lhs, const MirrorType2* rhs) {
return !(lhs == rhs);
}
template<class MirrorType>
inline std::ostream& operator<<(std::ostream& os, ObjPtr<MirrorType> ptr) {
// May be used for dumping bad pointers, do not use the checked version.
return os << ptr.PtrUnchecked();
}
} // namespace art
#endif // ART_RUNTIME_OBJ_PTR_INL_H_
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