// Copyright 2020 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/snapshot-data.h" #include "src/common/assert-scope.h" #include "src/snapshot/serializer.h" namespace v8 { namespace internal { void SerializedData::AllocateData(uint32_t size) { DCHECK(!owns_data_); data_ = NewArray<byte>(size); size_ = size; owns_data_ = true; } // static constexpr uint32_t SerializedData::kMagicNumber; SnapshotData::SnapshotData(const Serializer* serializer) { DisallowGarbageCollection no_gc; const std::vector<byte>* payload = serializer->Payload(); // Calculate sizes. uint32_t size = kHeaderSize + static_cast<uint32_t>(payload->size()); // Allocate backing store and create result data. AllocateData(size); // Zero out pre-payload data. Part of that is only used for padding. memset(data_, 0, kHeaderSize); // Set header values. SetMagicNumber(); SetHeaderValue(kPayloadLengthOffset, static_cast<int>(payload->size())); // Copy serialized data. CopyBytes(data_ + kHeaderSize, payload->data(), static_cast<size_t>(payload->size())); } base::Vector<const byte> SnapshotData::Payload() const { const byte* payload = data_ + kHeaderSize; uint32_t length = GetHeaderValue(kPayloadLengthOffset); DCHECK_EQ(data_ + size_, payload + length); return base::Vector<const byte>(payload, length); } } // namespace internal } // namespace v8