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// 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/utils/address-map.h" #include "src/execution/isolate.h" #include "src/heap/heap.h" #include "src/objects/heap-object-inl.h" #include "src/objects/objects-inl.h" namespace v8 { namespace internal { RootIndexMap::RootIndexMap(Isolate* isolate) { map_ = isolate->root_index_map(); if (map_ != nullptr) return; map_ = new HeapObjectToIndexHashMap(); for (RootIndex root_index = RootIndex::kFirstStrongOrReadOnlyRoot; root_index <= RootIndex::kLastStrongOrReadOnlyRoot; ++root_index) { Object root = isolate->root(root_index); if (!root.IsHeapObject()) continue; // Omit root entries that can be written after initialization. They must // not be referenced through the root list in the snapshot. // Since we map the raw address of an root item to its root list index, the // raw address must be constant, i.e. the object must be immovable. if (RootsTable::IsImmortalImmovable(root_index)) { HeapObject heap_object = HeapObject::cast(root); Maybe<uint32_t> maybe_index = map_->Get(heap_object); uint32_t index = static_cast<uint32_t>(root_index); if (maybe_index.IsJust()) { // Some are initialized to a previous value in the root list. DCHECK_LT(maybe_index.FromJust(), index); } else { map_->Set(heap_object, index); } } } isolate->set_root_index_map(map_); } bool RootIndexMap::Lookup(Address obj, RootIndex* out_root_list) const { return Lookup(HeapObject::cast(Object(obj)), out_root_list); } } // namespace internal } // namespace v8