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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 {
class BitmapSetSlowPathVisitor {
public:
explicit BitmapSetSlowPathVisitor(SemiSpace* semi_space) : semi_space_(semi_space) {
}
void operator()(const mirror::Object* obj) const {
CHECK(!semi_space_->to_space_->HasAddress(obj)) << "Marking " << obj << " in to_space_";
// Marking a large object, make sure its aligned as a sanity check.
CHECK(IsAligned<kPageSize>(obj));
}
private:
SemiSpace* const semi_space_;
};
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<bool kPoisonReferences>
inline void SemiSpace::MarkObject(
mirror::ObjectReference<kPoisonReferences, mirror::Object>* obj_ptr) {
mirror::Object* obj = obj_ptr->AsMirrorPtr();
if (obj == nullptr) {
return;
}
if (kUseBakerOrBrooksReadBarrier) {
// Verify all the objects have the correct forward pointer installed.
obj->AssertReadBarrierPointer();
}
if (!immune_region_.ContainsObject(obj)) {
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 {
BitmapSetSlowPathVisitor visitor(this);
if (kIsDebugBuild && mark_bitmap_->GetContinuousSpaceBitmap(obj) != nullptr) {
// If a bump pointer space only collection, we should not
// reach here as we don't/won't mark the objects in the
// non-moving space (except for the promoted objects.) Note
// the non-moving space is added to the immune space.
DCHECK(!generational_ || whole_heap_collection_);
}
if (!mark_bitmap_->Set(obj, visitor)) {
// This object was not previously marked.
MarkStackPush(obj);
}
}
}
}
} // namespace collector
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_
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