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// Copyright 2017 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.
#if !V8_ENABLE_WEBASSEMBLY
#error This header should only be included if WebAssembly is enabled.
#endif // !V8_ENABLE_WEBASSEMBLY
#ifndef V8_WASM_WASM_SERIALIZATION_H_
#define V8_WASM_WASM_SERIALIZATION_H_
#include "src/wasm/wasm-code-manager.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
namespace wasm {
// Support for serializing WebAssembly {NativeModule} objects. This class takes
// a snapshot of the module state at instantiation, and other code that modifies
// the module after that won't affect the serialized result.
class V8_EXPORT_PRIVATE WasmSerializer {
public:
explicit WasmSerializer(NativeModule* native_module);
// Measure the required buffer size needed for serialization.
size_t GetSerializedNativeModuleSize() const;
// Serialize the {NativeModule} into the provided {buffer}. Returns true on
// success and false if the given buffer it too small for serialization.
bool SerializeNativeModule(base::Vector<byte> buffer) const;
// The data header consists of uint32_t-sized entries (see {WriteVersion}):
// [0] magic number
// [1] version hash
// [2] supported CPU features
// [3] flag hash
// ... number of functions
// ... serialized functions
static constexpr size_t kMagicNumberOffset = 0;
static constexpr size_t kVersionHashOffset = kMagicNumberOffset + kUInt32Size;
static constexpr size_t kSupportedCPUFeaturesOffset =
kVersionHashOffset + kUInt32Size;
static constexpr size_t kFlagHashOffset =
kSupportedCPUFeaturesOffset + kUInt32Size;
static constexpr size_t kHeaderSize = 4 * kUInt32Size;
private:
NativeModule* native_module_;
// The {WasmCodeRefScope} keeps the pointers in {code_table_} alive.
WasmCodeRefScope code_ref_scope_;
std::vector<WasmCode*> code_table_;
};
// Support for deserializing WebAssembly {NativeModule} objects.
// Checks the version header of the data against the current version.
bool IsSupportedVersion(base::Vector<const byte> data);
// Deserializes the given data to create a Wasm module object.
V8_EXPORT_PRIVATE MaybeHandle<WasmModuleObject> DeserializeNativeModule(
Isolate*, base::Vector<const byte> data,
base::Vector<const byte> wire_bytes, base::Vector<const char> source_url);
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_WASM_SERIALIZATION_H_
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