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// Copyright 2018 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/snapshot/read-only-deserializer.h"
#include "src/api/api.h"
#include "src/execution/v8threads.h"
#include "src/heap/heap-inl.h" // crbug.com/v8/8499
#include "src/heap/read-only-heap.h"
#include "src/objects/slots.h"
#include "src/snapshot/snapshot.h"
namespace v8 {
namespace internal {
void ReadOnlyDeserializer::DeserializeInto(Isolate* isolate) {
Initialize(isolate);
if (!allocator()->ReserveSpace()) {
V8::FatalProcessOutOfMemory(isolate, "ReadOnlyDeserializer");
}
ReadOnlyHeap* ro_heap = isolate->read_only_heap();
// No active threads.
DCHECK_NULL(isolate->thread_manager()->FirstThreadStateInUse());
// No active handles.
DCHECK(isolate->handle_scope_implementer()->blocks()->empty());
// Read-only object cache is not yet populated.
DCHECK(!ro_heap->read_only_object_cache_is_initialized());
// Partial snapshot cache is not yet populated.
DCHECK(isolate->partial_snapshot_cache()->empty());
// Builtins are not yet created.
DCHECK(!isolate->builtins()->is_initialized());
{
DisallowHeapAllocation no_gc;
ReadOnlyRoots roots(isolate);
roots.Iterate(this);
ro_heap->read_only_space()->RepairFreeListsAfterDeserialization();
// Deserialize the Read-only Object Cache.
for (size_t i = 0;; ++i) {
Object* object = ro_heap->ExtendReadOnlyObjectCache();
// During deserialization, the visitor populates the read-only object
// cache and eventually terminates the cache with undefined.
VisitRootPointer(Root::kReadOnlyObjectCache, nullptr,
FullObjectSlot(object));
if (object->IsUndefined(roots)) break;
}
DeserializeDeferredObjects();
}
if (FLAG_rehash_snapshot && can_rehash()) {
isolate_->heap()->InitializeHashSeed();
Rehash();
}
}
} // namespace internal
} // namespace v8