1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_ 18 #define ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_ 19 20 #include "semi_space.h" 21 22 #include "gc/accounting/heap_bitmap.h" 23 #include "mirror/object-inl.h" 24 25 namespace art { 26 namespace gc { 27 namespace collector { 28 29 inline mirror::Object* SemiSpace::GetForwardingAddressInFromSpace(mirror::Object* obj) const { 30 DCHECK(from_space_->HasAddress(obj)); 31 LockWord lock_word = obj->GetLockWord(false); 32 if (lock_word.GetState() != LockWord::kForwardingAddress) { 33 return nullptr; 34 } 35 return reinterpret_cast<mirror::Object*>(lock_word.ForwardingAddress()); 36 } 37 38 // Used to mark and copy objects. Any newly-marked objects who are in the from space Get moved to 39 // the to-space and have their forward address updated. Objects which have been newly marked are 40 // pushed on the mark stack. 41 template<bool kPoisonReferences> 42 inline void SemiSpace::MarkObject( 43 mirror::ObjectReference<kPoisonReferences, mirror::Object>* obj_ptr) { 44 mirror::Object* obj = obj_ptr->AsMirrorPtr(); 45 if (obj == nullptr) { 46 return; 47 } 48 if (from_space_->HasAddress(obj)) { 49 mirror::Object* forward_address = GetForwardingAddressInFromSpace(obj); 50 // If the object has already been moved, return the new forward address. 51 if (UNLIKELY(forward_address == nullptr)) { 52 forward_address = MarkNonForwardedObject(obj); 53 DCHECK(forward_address != nullptr); 54 // Make sure to only update the forwarding address AFTER you copy the object so that the 55 // monitor word doesn't Get stomped over. 56 obj->SetLockWord( 57 LockWord::FromForwardingAddress(reinterpret_cast<size_t>(forward_address)), false); 58 // Push the object onto the mark stack for later processing. 59 MarkStackPush(forward_address); 60 } 61 obj_ptr->Assign(forward_address); 62 } else if (!collect_from_space_only_ && !immune_spaces_.IsInImmuneRegion(obj)) { 63 DCHECK(!to_space_->HasAddress(obj)) << "Tried to mark " << obj << " in to-space"; 64 auto slow_path = [this](const mirror::Object* ref) { 65 CHECK(!to_space_->HasAddress(ref)) << "Marking " << ref << " in to_space_"; 66 // Marking a large object, make sure its aligned as a sanity check. 67 CHECK_ALIGNED(ref, kPageSize); 68 }; 69 if (!mark_bitmap_->Set(obj, slow_path)) { 70 // This object was not previously marked. 71 MarkStackPush(obj); 72 } 73 } 74 } 75 76 template<bool kPoisonReferences> 77 inline void SemiSpace::MarkObjectIfNotInToSpace( 78 mirror::ObjectReference<kPoisonReferences, mirror::Object>* obj_ptr) { 79 if (!to_space_->HasAddress(obj_ptr->AsMirrorPtr())) { 80 MarkObject(obj_ptr); 81 } 82 } 83 84 } // namespace collector 85 } // namespace gc 86 } // namespace art 87 88 #endif // ART_RUNTIME_GC_COLLECTOR_SEMI_SPACE_INL_H_ 89
