87 lines
3.2 KiB
C++
87 lines
3.2 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_
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#define ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_
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#include "semi_space.h"
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#include "gc/accounting/heap_bitmap.h"
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#include "mirror/object-inl.h"
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namespace art {
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namespace gc {
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namespace collector {
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inline mirror::Object* SemiSpace::GetForwardingAddressInFromSpace(mirror::Object* obj) const {
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DCHECK(from_space_->HasAddress(obj));
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LockWord lock_word = obj->GetLockWord(false);
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if (lock_word.GetState() != LockWord::kForwardingAddress) {
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return nullptr;
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}
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return reinterpret_cast<mirror::Object*>(lock_word.ForwardingAddress());
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}
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// Used to mark and copy objects. Any newly-marked objects who are in the from space Get moved to
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// the to-space and have their forward address updated. Objects which have been newly marked are
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// pushed on the mark stack.
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template<typename CompressedReferenceType>
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inline void SemiSpace::MarkObject(CompressedReferenceType* obj_ptr) {
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mirror::Object* obj = obj_ptr->AsMirrorPtr();
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if (obj == nullptr) {
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return;
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}
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if (from_space_->HasAddress(obj)) {
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mirror::Object* forward_address = GetForwardingAddressInFromSpace(obj);
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// If the object has already been moved, return the new forward address.
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if (UNLIKELY(forward_address == nullptr)) {
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forward_address = MarkNonForwardedObject(obj);
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DCHECK(forward_address != nullptr);
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// Make sure to only update the forwarding address AFTER you copy the object so that the
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// monitor word doesn't Get stomped over.
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obj->SetLockWord(
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LockWord::FromForwardingAddress(reinterpret_cast<size_t>(forward_address)), false);
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// Push the object onto the mark stack for later processing.
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MarkStackPush(forward_address);
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}
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obj_ptr->Assign(forward_address);
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} else if (!immune_spaces_.IsInImmuneRegion(obj)) {
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DCHECK(!to_space_->HasAddress(obj)) << "Tried to mark " << obj << " in to-space";
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auto slow_path = [this](const mirror::Object* ref) {
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CHECK(!to_space_->HasAddress(ref)) << "Marking " << ref << " in to_space_";
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// Marking a large object, make sure its aligned as a consistency check.
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CHECK_ALIGNED(ref, kPageSize);
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};
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if (!mark_bitmap_->Set(obj, slow_path)) {
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// This object was not previously marked.
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MarkStackPush(obj);
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}
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}
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}
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template<typename CompressedReferenceType>
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inline void SemiSpace::MarkObjectIfNotInToSpace(CompressedReferenceType* obj_ptr) {
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if (!to_space_->HasAddress(obj_ptr->AsMirrorPtr())) {
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MarkObject(obj_ptr);
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}
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}
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} // namespace collector
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} // namespace gc
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} // namespace art
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#endif // ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_
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