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// Copyright 2021 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef INCLUDE_V8_VALUE_SERIALIZER_H_
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#define INCLUDE_V8_VALUE_SERIALIZER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <utility>
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#include "v8-local-handle.h" // NOLINT(build/include_directory)
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#include "v8-maybe.h" // NOLINT(build/include_directory)
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#include "v8config.h" // NOLINT(build/include_directory)
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namespace v8 {
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class ArrayBuffer;
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class Isolate;
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class Object;
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class SharedArrayBuffer;
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class String;
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class WasmModuleObject;
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class Value;
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namespace internal {
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struct ScriptStreamingData;
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} // namespace internal
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/**
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* Value serialization compatible with the HTML structured clone algorithm.
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* The format is backward-compatible (i.e. safe to store to disk).
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*/
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class V8_EXPORT ValueSerializer {
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public:
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class V8_EXPORT Delegate {
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public:
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virtual ~Delegate() = default;
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/**
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* Handles the case where a DataCloneError would be thrown in the structured
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* clone spec. Other V8 embedders may throw some other appropriate exception
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* type.
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*/
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virtual void ThrowDataCloneError(Local<String> message) = 0;
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/**
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* The embedder overrides this method to write some kind of host object, if
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* possible. If not, a suitable exception should be thrown and
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* Nothing<bool>() returned.
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*/
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virtual Maybe<bool> WriteHostObject(Isolate* isolate, Local<Object> object);
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/**
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* Called when the ValueSerializer is going to serialize a
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* SharedArrayBuffer object. The embedder must return an ID for the
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* object, using the same ID if this SharedArrayBuffer has already been
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* serialized in this buffer. When deserializing, this ID will be passed to
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* ValueDeserializer::GetSharedArrayBufferFromId as |clone_id|.
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*
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* If the object cannot be serialized, an
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* exception should be thrown and Nothing<uint32_t>() returned.
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*/
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virtual Maybe<uint32_t> GetSharedArrayBufferId(
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Isolate* isolate, Local<SharedArrayBuffer> shared_array_buffer);
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virtual Maybe<uint32_t> GetWasmModuleTransferId(
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Isolate* isolate, Local<WasmModuleObject> module);
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/**
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* Returns whether shared values are supported. GetSharedValueId is only
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* called if SupportsSharedValues() returns true.
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*/
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virtual bool SupportsSharedValues() const;
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/**
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* Called when the ValueSerializer serializes a value that is shared across
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* Isolates. The embedder must return an ID for the object. This function
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* must be idempotent for the same object. When deserializing, the ID will
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* be passed to ValueDeserializer::Delegate::GetSharedValueFromId as
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* |shared_value_id|.
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*/
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virtual Maybe<uint32_t> GetSharedValueId(Isolate* isolate,
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Local<Value> shared_value);
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/**
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* Allocates memory for the buffer of at least the size provided. The actual
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* size (which may be greater or equal) is written to |actual_size|. If no
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* buffer has been allocated yet, nullptr will be provided.
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*
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* If the memory cannot be allocated, nullptr should be returned.
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* |actual_size| will be ignored. It is assumed that |old_buffer| is still
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* valid in this case and has not been modified.
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*
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* The default implementation uses the stdlib's `realloc()` function.
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*/
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virtual void* ReallocateBufferMemory(void* old_buffer, size_t size,
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size_t* actual_size);
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/**
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* Frees a buffer allocated with |ReallocateBufferMemory|.
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*
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* The default implementation uses the stdlib's `free()` function.
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*/
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virtual void FreeBufferMemory(void* buffer);
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};
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explicit ValueSerializer(Isolate* isolate);
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ValueSerializer(Isolate* isolate, Delegate* delegate);
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~ValueSerializer();
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/**
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* Writes out a header, which includes the format version.
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*/
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void WriteHeader();
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/**
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* Serializes a JavaScript value into the buffer.
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*/
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V8_WARN_UNUSED_RESULT Maybe<bool> WriteValue(Local<Context> context,
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Local<Value> value);
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/**
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* Returns the stored data (allocated using the delegate's
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* ReallocateBufferMemory) and its size. This serializer should not be used
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* once the buffer is released. The contents are undefined if a previous write
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* has failed. Ownership of the buffer is transferred to the caller.
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*/
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V8_WARN_UNUSED_RESULT std::pair<uint8_t*, size_t> Release();
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/**
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* Marks an ArrayBuffer as havings its contents transferred out of band.
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* Pass the corresponding ArrayBuffer in the deserializing context to
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* ValueDeserializer::TransferArrayBuffer.
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*/
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void TransferArrayBuffer(uint32_t transfer_id,
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Local<ArrayBuffer> array_buffer);
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/**
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* Indicate whether to treat ArrayBufferView objects as host objects,
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* i.e. pass them to Delegate::WriteHostObject. This should not be
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* called when no Delegate was passed.
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*
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* The default is not to treat ArrayBufferViews as host objects.
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*/
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void SetTreatArrayBufferViewsAsHostObjects(bool mode);
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/**
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* Write raw data in various common formats to the buffer.
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* Note that integer types are written in base-128 varint format, not with a
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* binary copy. For use during an override of Delegate::WriteHostObject.
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*/
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void WriteUint32(uint32_t value);
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void WriteUint64(uint64_t value);
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void WriteDouble(double value);
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void WriteRawBytes(const void* source, size_t length);
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ValueSerializer(const ValueSerializer&) = delete;
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void operator=(const ValueSerializer&) = delete;
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private:
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struct PrivateData;
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PrivateData* private_;
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};
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/**
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* Deserializes values from data written with ValueSerializer, or a compatible
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* implementation.
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*/
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class V8_EXPORT ValueDeserializer {
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public:
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class V8_EXPORT Delegate {
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public:
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virtual ~Delegate() = default;
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/**
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* The embedder overrides this method to read some kind of host object, if
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* possible. If not, a suitable exception should be thrown and
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* MaybeLocal<Object>() returned.
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*/
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virtual MaybeLocal<Object> ReadHostObject(Isolate* isolate);
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/**
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* Get a WasmModuleObject given a transfer_id previously provided
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* by ValueSerializer::Delegate::GetWasmModuleTransferId
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*/
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virtual MaybeLocal<WasmModuleObject> GetWasmModuleFromId(
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Isolate* isolate, uint32_t transfer_id);
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/**
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* Get a SharedArrayBuffer given a clone_id previously provided
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* by ValueSerializer::Delegate::GetSharedArrayBufferId
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*/
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virtual MaybeLocal<SharedArrayBuffer> GetSharedArrayBufferFromId(
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Isolate* isolate, uint32_t clone_id);
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/**
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* Returns whether shared values are supported. GetSharedValueFromId is only
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* called if SupportsSharedValues() returns true.
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*/
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virtual bool SupportsSharedValues() const;
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/**
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* Get a value shared across Isolates given a shared_value_id provided by
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* ValueSerializer::Delegate::GetSharedValueId.
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*/
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virtual MaybeLocal<Value> GetSharedValueFromId(Isolate* isolate,
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uint32_t shared_value_id);
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};
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ValueDeserializer(Isolate* isolate, const uint8_t* data, size_t size);
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ValueDeserializer(Isolate* isolate, const uint8_t* data, size_t size,
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Delegate* delegate);
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~ValueDeserializer();
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/**
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* Reads and validates a header (including the format version).
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* May, for example, reject an invalid or unsupported wire format.
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*/
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V8_WARN_UNUSED_RESULT Maybe<bool> ReadHeader(Local<Context> context);
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/**
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* Deserializes a JavaScript value from the buffer.
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*/
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V8_WARN_UNUSED_RESULT MaybeLocal<Value> ReadValue(Local<Context> context);
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/**
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* Accepts the array buffer corresponding to the one passed previously to
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* ValueSerializer::TransferArrayBuffer.
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*/
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void TransferArrayBuffer(uint32_t transfer_id,
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Local<ArrayBuffer> array_buffer);
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/**
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* Similar to TransferArrayBuffer, but for SharedArrayBuffer.
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* The id is not necessarily in the same namespace as unshared ArrayBuffer
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* objects.
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*/
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void TransferSharedArrayBuffer(uint32_t id,
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Local<SharedArrayBuffer> shared_array_buffer);
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/**
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* Must be called before ReadHeader to enable support for reading the legacy
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* wire format (i.e., which predates this being shipped).
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*
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* Don't use this unless you need to read data written by previous versions of
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* blink::ScriptValueSerializer.
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*/
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void SetSupportsLegacyWireFormat(bool supports_legacy_wire_format);
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/**
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* Reads the underlying wire format version. Likely mostly to be useful to
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* legacy code reading old wire format versions. Must be called after
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* ReadHeader.
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*/
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uint32_t GetWireFormatVersion() const;
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/**
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* Reads raw data in various common formats to the buffer.
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* Note that integer types are read in base-128 varint format, not with a
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* binary copy. For use during an override of Delegate::ReadHostObject.
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*/
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V8_WARN_UNUSED_RESULT bool ReadUint32(uint32_t* value);
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V8_WARN_UNUSED_RESULT bool ReadUint64(uint64_t* value);
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V8_WARN_UNUSED_RESULT bool ReadDouble(double* value);
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V8_WARN_UNUSED_RESULT bool ReadRawBytes(size_t length, const void** data);
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ValueDeserializer(const ValueDeserializer&) = delete;
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void operator=(const ValueDeserializer&) = delete;
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private:
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struct PrivateData;
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PrivateData* private_;
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};
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} // namespace v8
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#endif // INCLUDE_V8_VALUE_SERIALIZER_H_
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