| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/address-map.h" |
| #include "src/heap/heap.h" |
| #include "src/isolate.h" |
| #include "src/objects-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| RootIndexMap::RootIndexMap(Isolate* isolate) { |
| map_ = isolate->root_index_map(); |
| if (map_ != NULL) return; |
| map_ = new HashMap(HashMap::PointersMatch); |
| for (uint32_t i = 0; i < Heap::kStrongRootListLength; i++) { |
| Heap::RootListIndex root_index = static_cast<Heap::RootListIndex>(i); |
| Object* root = isolate->heap()->root(root_index); |
| // Omit root entries that can be written after initialization. They must |
| // not be referenced through the root list in the snapshot. |
| if (root->IsHeapObject() && |
| isolate->heap()->RootCanBeTreatedAsConstant(root_index)) { |
| HeapObject* heap_object = HeapObject::cast(root); |
| HashMap::Entry* entry = LookupEntry(map_, heap_object, false); |
| if (entry != NULL) { |
| // Some are initialized to a previous value in the root list. |
| DCHECK_LT(GetValue(entry), i); |
| } else { |
| SetValue(LookupEntry(map_, heap_object, true), i); |
| } |
| } |
| } |
| isolate->set_root_index_map(map_); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |