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// Copyright 2016 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. #ifndef V8_SNAPSHOT_CODE_SERIALIZER_H_ #define V8_SNAPSHOT_CODE_SERIALIZER_H_ #include "src/base/macros.h" #include "src/snapshot/serializer.h" namespace v8 { namespace internal { class V8_EXPORT_PRIVATE ScriptData { public: ScriptData(const byte* data, int length); ~ScriptData() { if (owns_data_) DeleteArray(data_); } const byte* data() const { return data_; } int length() const { return length_; } bool rejected() const { return rejected_; } void Reject() { rejected_ = true; } void AcquireDataOwnership() { DCHECK(!owns_data_); owns_data_ = true; } void ReleaseDataOwnership() { DCHECK(owns_data_); owns_data_ = false; } private: bool owns_data_ : 1; bool rejected_ : 1; const byte* data_; int length_; DISALLOW_COPY_AND_ASSIGN(ScriptData); }; class CodeSerializer : public Serializer { public: V8_EXPORT_PRIVATE static ScriptCompiler::CachedData* Serialize( Handle<SharedFunctionInfo> info); ScriptData* SerializeSharedFunctionInfo(Handle<SharedFunctionInfo> info); V8_WARN_UNUSED_RESULT static MaybeHandle<SharedFunctionInfo> Deserialize( Isolate* isolate, ScriptData* cached_data, Handle<String> source, ScriptOriginOptions origin_options); uint32_t source_hash() const { return source_hash_; } protected: CodeSerializer(Isolate* isolate, uint32_t source_hash); ~CodeSerializer() override { OutputStatistics("CodeSerializer"); } virtual bool ElideObject(Object obj) { return false; } void SerializeGeneric(HeapObject heap_object); private: void SerializeObject(HeapObject o) override; bool SerializeReadOnlyObject(HeapObject obj); DISALLOW_HEAP_ALLOCATION(no_gc_) uint32_t source_hash_; DISALLOW_COPY_AND_ASSIGN(CodeSerializer); }; // Wrapper around ScriptData to provide code-serializer-specific functionality. class SerializedCodeData : public SerializedData { public: enum SanityCheckResult { CHECK_SUCCESS = 0, MAGIC_NUMBER_MISMATCH = 1, VERSION_MISMATCH = 2, SOURCE_MISMATCH = 3, FLAGS_MISMATCH = 5, CHECKSUM_MISMATCH = 6, INVALID_HEADER = 7, LENGTH_MISMATCH = 8 }; // The data header consists of uint32_t-sized entries: // [0] magic number and (internally provided) external reference count // [1] version hash // [2] source hash // [3] flag hash // [4] number of reservation size entries // [5] payload length // [6] payload checksum part A // [7] payload checksum part B // ... reservations // ... code stub keys // ... serialized payload static const uint32_t kVersionHashOffset = kMagicNumberOffset + kUInt32Size; static const uint32_t kSourceHashOffset = kVersionHashOffset + kUInt32Size; static const uint32_t kFlagHashOffset = kSourceHashOffset + kUInt32Size; static const uint32_t kNumReservationsOffset = kFlagHashOffset + kUInt32Size; static const uint32_t kPayloadLengthOffset = kNumReservationsOffset + kUInt32Size; static const uint32_t kChecksumPartAOffset = kPayloadLengthOffset + kUInt32Size; static const uint32_t kChecksumPartBOffset = kChecksumPartAOffset + kUInt32Size; static const uint32_t kUnalignedHeaderSize = kChecksumPartBOffset + kUInt32Size; static const uint32_t kHeaderSize = POINTER_SIZE_ALIGN(kUnalignedHeaderSize); // Used when consuming. static SerializedCodeData FromCachedData(Isolate* isolate, ScriptData* cached_data, uint32_t expected_source_hash, SanityCheckResult* rejection_result); // Used when producing. SerializedCodeData(const std::vector<byte>* payload, const CodeSerializer* cs); // Return ScriptData object and relinquish ownership over it to the caller. ScriptData* GetScriptData(); std::vector<Reservation> Reservations() const; Vector<const byte> Payload() const; static uint32_t SourceHash(Handle<String> source, ScriptOriginOptions origin_options); private: explicit SerializedCodeData(ScriptData* data); SerializedCodeData(const byte* data, int size) : SerializedData(const_cast<byte*>(data), size) {} Vector<const byte> ChecksummedContent() const { return Vector<const byte>(data_ + kHeaderSize, size_ - kHeaderSize); } SanityCheckResult SanityCheck(Isolate* isolate, uint32_t expected_source_hash) const; }; } // namespace internal } // namespace v8 #endif // V8_SNAPSHOT_CODE_SERIALIZER_H_