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/*
* Copyright (C) 2015 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.
*/
#include "field-inl.h"
#include "class-inl.h"
#include "dex_cache-inl.h"
#include "object-inl.h"
#include "object_array-inl.h"
#include "write_barrier.h"
namespace art {
namespace mirror {
void Field::VisitTarget(ReflectiveValueVisitor* v) {
HeapReflectiveSourceInfo hrsi(kSourceJavaLangReflectField, this);
ArtField* orig = GetArtField();
ArtField* new_value = v->VisitField(orig, hrsi);
if (orig != new_value) {
SetOffset<false>(new_value->GetOffset().Int32Value());
SetDeclaringClass<false>(new_value->GetDeclaringClass());
auto new_range =
IsStatic() ? GetDeclaringClass()->GetSFields() : GetDeclaringClass()->GetIFields();
auto position = std::find_if(
new_range.begin(), new_range.end(), [&](const auto& f) { return &f == new_value; });
DCHECK(position != new_range.end());
SetArtFieldIndex<false>(std::distance(new_range.begin(), position));
WriteBarrier::ForEveryFieldWrite(this);
}
DCHECK_EQ(new_value, GetArtField());
}
ArtField* Field::GetArtField() {
ObjPtr<mirror::Class> declaring_class = GetDeclaringClass();
if (IsStatic()) {
DCHECK_LT(GetArtFieldIndex(), declaring_class->NumStaticFields());
return declaring_class->GetStaticField(GetArtFieldIndex());
} else {
DCHECK_LT(GetArtFieldIndex(), declaring_class->NumInstanceFields());
return declaring_class->GetInstanceField(GetArtFieldIndex());
}
}
ObjPtr<mirror::Field> Field::CreateFromArtField(Thread* self,
ArtField* field,
bool force_resolve) {
StackHandleScope<2> hs(self);
// Try to resolve type before allocating since this is a thread suspension point.
Handle<mirror::Class> type = hs.NewHandle(field->ResolveType());
if (type == nullptr) {
DCHECK(self->IsExceptionPending());
if (force_resolve) {
return nullptr;
} else {
// Can't resolve, clear the exception if it isn't OOME and continue with a null type.
mirror::Throwable* exception = self->GetException();
if (exception->GetClass()->DescriptorEquals("Ljava/lang/OutOfMemoryError;")) {
return nullptr;
}
self->ClearException();
}
}
auto ret = hs.NewHandle(ObjPtr<Field>::DownCast(GetClassRoot<Field>()->AllocObject(self)));
if (UNLIKELY(ret == nullptr)) {
self->AssertPendingOOMException();
return nullptr;
}
// We're initializing a newly allocated object, so we do not need to record that under
// a transaction. If the transaction is aborted, the whole object shall be unreachable.
ret->SetType</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(type.Get());
ret->SetDeclaringClass</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
field->GetDeclaringClass());
ret->SetAccessFlags</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
field->GetAccessFlags());
auto iter_range = field->IsStatic() ? field->GetDeclaringClass()->GetSFields()
: field->GetDeclaringClass()->GetIFields();
auto position = std::find_if(
iter_range.begin(), iter_range.end(), [&](const auto& f) { return &f == field; });
DCHECK(position != iter_range.end());
ret->SetArtFieldIndex</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
std::distance(iter_range.begin(), position));
ret->SetOffset</*kTransactionActive=*/ false, /*kCheckTransaction=*/ false>(
field->GetOffset().Int32Value());
return ret.Get();
}
} // namespace mirror
} // namespace art
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