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/*
* Copyright (C) 2013 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_GC_COLLECTOR_SEMI_SPACE_INL_H_
#define ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_
#include "semi_space.h"
#include "gc/accounting/heap_bitmap.h"
#include "mirror/object-inl.h"
namespace art {
namespace gc {
namespace collector {
inline mirror::Object* SemiSpace::GetForwardingAddressInFromSpace(mirror::Object* obj) const {
DCHECK(from_space_->HasAddress(obj));
LockWord lock_word = obj->GetLockWord(false);
if (lock_word.GetState() != LockWord::kForwardingAddress) {
return nullptr;
}
return reinterpret_cast<mirror::Object*>(lock_word.ForwardingAddress());
}
// Used to mark and copy objects. Any newly-marked objects who are in the from space Get moved to
// the to-space and have their forward address updated. Objects which have been newly marked are
// pushed on the mark stack.
template<typename CompressedReferenceType>
inline void SemiSpace::MarkObject(CompressedReferenceType* obj_ptr) {
mirror::Object* obj = obj_ptr->AsMirrorPtr();
if (obj == nullptr) {
return;
}
if (from_space_->HasAddress(obj)) {
mirror::Object* forward_address = GetForwardingAddressInFromSpace(obj);
// If the object has already been moved, return the new forward address.
if (UNLIKELY(forward_address == nullptr)) {
forward_address = MarkNonForwardedObject(obj);
DCHECK(forward_address != nullptr);
// Make sure to only update the forwarding address AFTER you copy the object so that the
// monitor word doesn't Get stomped over.
obj->SetLockWord(
LockWord::FromForwardingAddress(reinterpret_cast<size_t>(forward_address)), false);
// Push the object onto the mark stack for later processing.
MarkStackPush(forward_address);
}
obj_ptr->Assign(forward_address);
} else if (!collect_from_space_only_ && !immune_spaces_.IsInImmuneRegion(obj)) {
DCHECK(!to_space_->HasAddress(obj)) << "Tried to mark " << obj << " in to-space";
auto slow_path = [this](const mirror::Object* ref) {
CHECK(!to_space_->HasAddress(ref)) << "Marking " << ref << " in to_space_";
// Marking a large object, make sure its aligned as a sanity check.
CHECK_ALIGNED(ref, kPageSize);
};
if (!mark_bitmap_->Set(obj, slow_path)) {
// This object was not previously marked.
MarkStackPush(obj);
}
}
}
template<typename CompressedReferenceType>
inline void SemiSpace::MarkObjectIfNotInToSpace(CompressedReferenceType* obj_ptr) {
if (!to_space_->HasAddress(obj_ptr->AsMirrorPtr())) {
MarkObject(obj_ptr);
}
}
} // namespace collector
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_