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//===--- simple_packed_serialization.h - simple serialization ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of the ORC runtime support library.
//
// The behavior of the utilities in this header must be synchronized with the
// behavior of the utilities in
// llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h.
//
// The Simple Packed Serialization (SPS) utilities are used to generate
// argument and return buffers for wrapper functions using the following
// serialization scheme:
//
// Primitives:
// bool, char, int8_t, uint8_t -- Two's complement 8-bit (0=false, 1=true)
// int16_t, uint16_t -- Two's complement 16-bit little endian
// int32_t, uint32_t -- Two's complement 32-bit little endian
// int64_t, int64_t -- Two's complement 64-bit little endian
//
// Sequence<T>:
// Serialized as the sequence length (as a uint64_t) followed by the
// serialization of each of the elements without padding.
//
// Tuple<T1, ..., TN>:
// Serialized as each of the element types from T1 to TN without padding.
//
//===----------------------------------------------------------------------===//
#ifndef ORC_RT_SIMPLE_PACKED_SERIALIZATION_H
#define ORC_RT_SIMPLE_PACKED_SERIALIZATION_H
#include "adt.h"
#include "endianness.h"
#include "error.h"
#include "stl_extras.h"
#include <string>
#include <tuple>
#include <type_traits>
#include <unordered_map>
#include <utility>
#include <vector>
namespace __orc_rt {
/// Output char buffer with overflow check.
class SPSOutputBuffer {
public:
SPSOutputBuffer(char *Buffer, size_t Remaining)
: Buffer(Buffer), Remaining(Remaining) {}
bool write(const char *Data, size_t Size) {
if (Size > Remaining)
return false;
memcpy(Buffer, Data, Size);
Buffer += Size;
Remaining -= Size;
return true;
}
private:
char *Buffer = nullptr;
size_t Remaining = 0;
};
/// Input char buffer with underflow check.
class SPSInputBuffer {
public:
SPSInputBuffer() = default;
SPSInputBuffer(const char *Buffer, size_t Remaining)
: Buffer(Buffer), Remaining(Remaining) {}
bool read(char *Data, size_t Size) {
if (Size > Remaining)
return false;
memcpy(Data, Buffer, Size);
Buffer += Size;
Remaining -= Size;
return true;
}
const char *data() const { return Buffer; }
bool skip(size_t Size) {
if (Size > Remaining)
return false;
Buffer += Size;
Remaining -= Size;
return true;
}
private:
const char *Buffer = nullptr;
size_t Remaining = 0;
};
/// Specialize to describe how to serialize/deserialize to/from the given
/// concrete type.
template <typename SPSTagT, typename ConcreteT, typename _ = void>
class SPSSerializationTraits;
/// A utility class for serializing to a blob from a variadic list.
template <typename... ArgTs> class SPSArgList;
// Empty list specialization for SPSArgList.
template <> class SPSArgList<> {
public:
static size_t size() { return 0; }
static bool serialize(SPSOutputBuffer &OB) { return true; }
static bool deserialize(SPSInputBuffer &IB) { return true; }
};
// Non-empty list specialization for SPSArgList.
template <typename SPSTagT, typename... SPSTagTs>
class SPSArgList<SPSTagT, SPSTagTs...> {
public:
template <typename ArgT, typename... ArgTs>
static size_t size(const ArgT &Arg, const ArgTs &...Args) {
return SPSSerializationTraits<SPSTagT, ArgT>::size(Arg) +
SPSArgList<SPSTagTs...>::size(Args...);
}
template <typename ArgT, typename... ArgTs>
static bool serialize(SPSOutputBuffer &OB, const ArgT &Arg,
const ArgTs &...Args) {
return SPSSerializationTraits<SPSTagT, ArgT>::serialize(OB, Arg) &&
SPSArgList<SPSTagTs...>::serialize(OB, Args...);
}
template <typename ArgT, typename... ArgTs>
static bool deserialize(SPSInputBuffer &IB, ArgT &Arg, ArgTs &...Args) {
return SPSSerializationTraits<SPSTagT, ArgT>::deserialize(IB, Arg) &&
SPSArgList<SPSTagTs...>::deserialize(IB, Args...);
}
};
/// SPS serialization for integral types, bool, and char.
template <typename SPSTagT>
class SPSSerializationTraits<
SPSTagT, SPSTagT,
std::enable_if_t<std::is_same<SPSTagT, bool>::value ||
std::is_same<SPSTagT, char>::value ||
std::is_same<SPSTagT, int8_t>::value ||
std::is_same<SPSTagT, int16_t>::value ||
std::is_same<SPSTagT, int32_t>::value ||
std::is_same<SPSTagT, int64_t>::value ||
std::is_same<SPSTagT, uint8_t>::value ||
std::is_same<SPSTagT, uint16_t>::value ||
std::is_same<SPSTagT, uint32_t>::value ||
std::is_same<SPSTagT, uint64_t>::value>> {
public:
static size_t size(const SPSTagT &Value) { return sizeof(SPSTagT); }
static bool serialize(SPSOutputBuffer &OB, const SPSTagT &Value) {
SPSTagT Tmp = Value;
if (IsBigEndianHost)
swapByteOrder(Tmp);
return OB.write(reinterpret_cast<const char *>(&Tmp), sizeof(Tmp));
}
static bool deserialize(SPSInputBuffer &IB, SPSTagT &Value) {
SPSTagT Tmp;
if (!IB.read(reinterpret_cast<char *>(&Tmp), sizeof(Tmp)))
return false;
if (IsBigEndianHost)
swapByteOrder(Tmp);
Value = Tmp;
return true;
}
};
/// Any empty placeholder suitable as a substitute for void when deserializing
class SPSEmpty {};
/// Represents an address in the executor.
class SPSExecutorAddr {};
/// SPS tag type for tuples.
///
/// A blob tuple should be serialized by serializing each of the elements in
/// sequence.
template <typename... SPSTagTs> class SPSTuple {
public:
/// Convenience typedef of the corresponding arg list.
typedef SPSArgList<SPSTagTs...> AsArgList;
};
/// SPS tag type for sequences.
///
/// SPSSequences should be serialized as a uint64_t sequence length,
/// followed by the serialization of each of the elements.
template <typename SPSElementTagT> class SPSSequence;
/// SPS tag type for strings, which are equivalent to sequences of chars.
using SPSString = SPSSequence<char>;
/// SPS tag type for maps.
///
/// SPS maps are just sequences of (Key, Value) tuples.
template <typename SPSTagT1, typename SPSTagT2>
using SPSMap = SPSSequence<SPSTuple<SPSTagT1, SPSTagT2>>;
/// Serialization for SPSEmpty type.
template <> class SPSSerializationTraits<SPSEmpty, SPSEmpty> {
public:
static size_t size(const SPSEmpty &EP) { return 0; }
static bool serialize(SPSOutputBuffer &OB, const SPSEmpty &BE) {
return true;
}
static bool deserialize(SPSInputBuffer &IB, SPSEmpty &BE) { return true; }
};
/// Specialize this to implement 'trivial' sequence serialization for
/// a concrete sequence type.
///
/// Trivial sequence serialization uses the sequence's 'size' member to get the
/// length of the sequence, and uses a range-based for loop to iterate over the
/// elements.
///
/// Specializing this template class means that you do not need to provide a
/// specialization of SPSSerializationTraits for your type.
template <typename SPSElementTagT, typename ConcreteSequenceT>
class TrivialSPSSequenceSerialization {
public:
static constexpr bool available = false;
};
/// Specialize this to implement 'trivial' sequence deserialization for
/// a concrete sequence type.
///
/// Trivial deserialization calls a static 'reserve(SequenceT&)' method on your
/// specialization (you must implement this) to reserve space, and then calls
/// a static 'append(SequenceT&, ElementT&) method to append each of the
/// deserialized elements.
///
/// Specializing this template class means that you do not need to provide a
/// specialization of SPSSerializationTraits for your type.
template <typename SPSElementTagT, typename ConcreteSequenceT>
class TrivialSPSSequenceDeserialization {
public:
static constexpr bool available = false;
};
/// Trivial std::string -> SPSSequence<char> serialization.
template <> class TrivialSPSSequenceSerialization<char, std::string> {
public:
static constexpr bool available = true;
};
/// Trivial SPSSequence<char> -> std::string deserialization.
template <> class TrivialSPSSequenceDeserialization<char, std::string> {
public:
static constexpr bool available = true;
using element_type = char;
static void reserve(std::string &S, uint64_t Size) { S.reserve(Size); }
static bool append(std::string &S, char C) {
S.push_back(C);
return true;
}
};
/// Trivial std::vector<T> -> SPSSequence<SPSElementTagT> serialization.
template <typename SPSElementTagT, typename T>
class TrivialSPSSequenceSerialization<SPSElementTagT, std::vector<T>> {
public:
static constexpr bool available = true;
};
/// Trivial SPSSequence<SPSElementTagT> -> std::vector<T> deserialization.
template <typename SPSElementTagT, typename T>
class TrivialSPSSequenceDeserialization<SPSElementTagT, std::vector<T>> {
public:
static constexpr bool available = true;
using element_type = typename std::vector<T>::value_type;
static void reserve(std::vector<T> &V, uint64_t Size) { V.reserve(Size); }
static bool append(std::vector<T> &V, T E) {
V.push_back(std::move(E));
return true;
}
};
/// Trivial std::unordered_map<K, V> -> SPSSequence<SPSTuple<SPSKey, SPSValue>>
/// serialization.
template <typename SPSKeyTagT, typename SPSValueTagT, typename K, typename V>
class TrivialSPSSequenceSerialization<SPSTuple<SPSKeyTagT, SPSValueTagT>,
std::unordered_map<K, V>> {
public:
static constexpr bool available = true;
};
/// Trivial SPSSequence<SPSTuple<SPSKey, SPSValue>> -> std::unordered_map<K, V>
/// deserialization.
template <typename SPSKeyTagT, typename SPSValueTagT, typename K, typename V>
class TrivialSPSSequenceDeserialization<SPSTuple<SPSKeyTagT, SPSValueTagT>,
std::unordered_map<K, V>> {
public:
static constexpr bool available = true;
using element_type = std::pair<K, V>;
static void reserve(std::unordered_map<K, V> &M, uint64_t Size) {
M.reserve(Size);
}
static bool append(std::unordered_map<K, V> &M, element_type E) {
return M.insert(std::move(E)).second;
}
};
/// 'Trivial' sequence serialization: Sequence is serialized as a uint64_t size
/// followed by a for-earch loop over the elements of the sequence to serialize
/// each of them.
template <typename SPSElementTagT, typename SequenceT>
class SPSSerializationTraits<SPSSequence<SPSElementTagT>, SequenceT,
std::enable_if_t<TrivialSPSSequenceSerialization<
SPSElementTagT, SequenceT>::available>> {
public:
static size_t size(const SequenceT &S) {
size_t Size = SPSArgList<uint64_t>::size(static_cast<uint64_t>(S.size()));
for (const auto &E : S)
Size += SPSArgList<SPSElementTagT>::size(E);
return Size;
}
static bool serialize(SPSOutputBuffer &OB, const SequenceT &S) {
if (!SPSArgList<uint64_t>::serialize(OB, static_cast<uint64_t>(S.size())))
return false;
for (const auto &E : S)
if (!SPSArgList<SPSElementTagT>::serialize(OB, E))
return false;
return true;
}
static bool deserialize(SPSInputBuffer &IB, SequenceT &S) {
using TBSD = TrivialSPSSequenceDeserialization<SPSElementTagT, SequenceT>;
uint64_t Size;
if (!SPSArgList<uint64_t>::deserialize(IB, Size))
return false;
TBSD::reserve(S, Size);
for (size_t I = 0; I != Size; ++I) {
typename TBSD::element_type E;
if (!SPSArgList<SPSElementTagT>::deserialize(IB, E))
return false;
if (!TBSD::append(S, std::move(E)))
return false;
}
return true;
}
};
/// Trivial serialization / deserialization for span<char>
template <> class SPSSerializationTraits<SPSSequence<char>, span<const char>> {
public:
static size_t size(const span<const char> &S) {
return SPSArgList<uint64_t>::size(static_cast<uint64_t>(S.size())) +
S.size();
}
static bool serialize(SPSOutputBuffer &OB, const span<const char> &S) {
if (!SPSArgList<uint64_t>::serialize(OB, static_cast<uint64_t>(S.size())))
return false;
return OB.write(S.data(), S.size());
}
static bool deserialize(SPSInputBuffer &IB, span<const char> &S) {
uint64_t Size;
if (!SPSArgList<uint64_t>::deserialize(IB, Size))
return false;
S = span<const char>(IB.data(), Size);
return IB.skip(Size);
}
};
/// SPSTuple serialization for std::pair.
template <typename SPSTagT1, typename SPSTagT2, typename T1, typename T2>
class SPSSerializationTraits<SPSTuple<SPSTagT1, SPSTagT2>, std::pair<T1, T2>> {
public:
static size_t size(const std::pair<T1, T2> &P) {
return SPSArgList<SPSTagT1>::size(P.first) +
SPSArgList<SPSTagT2>::size(P.second);
}
static bool serialize(SPSOutputBuffer &OB, const std::pair<T1, T2> &P) {
return SPSArgList<SPSTagT1>::serialize(OB, P.first) &&
SPSArgList<SPSTagT2>::serialize(OB, P.second);
}
static bool deserialize(SPSInputBuffer &IB, std::pair<T1, T2> &P) {
return SPSArgList<SPSTagT1>::deserialize(IB, P.first) &&
SPSArgList<SPSTagT2>::deserialize(IB, P.second);
}
};
/// Serialization for string_views.
///
/// Serialization is as for regular strings. Deserialization points directly
/// into the blob.
template <> class SPSSerializationTraits<SPSString, __orc_rt::string_view> {
public:
static size_t size(const __orc_rt::string_view &S) {
return SPSArgList<uint64_t>::size(static_cast<uint64_t>(S.size())) +
S.size();
}
static bool serialize(SPSOutputBuffer &OB, const __orc_rt::string_view &S) {
if (!SPSArgList<uint64_t>::serialize(OB, static_cast<uint64_t>(S.size())))
return false;
return OB.write(S.data(), S.size());
}
static bool deserialize(SPSInputBuffer &IB, __orc_rt::string_view &S) {
const char *Data = nullptr;
uint64_t Size;
if (!SPSArgList<uint64_t>::deserialize(IB, Size))
return false;
if (Size > std::numeric_limits<size_t>::max())
return false;
Data = IB.data();
if (!IB.skip(Size))
return false;
S = {Data, static_cast<size_t>(Size)};
return true;
}
};
/// SPS tag type for errors.
class SPSError;
/// SPS tag type for expecteds, which are either a T or a string representing
/// an error.
template <typename SPSTagT> class SPSExpected;
namespace detail {
/// Helper type for serializing Errors.
///
/// llvm::Errors are move-only, and not inspectable except by consuming them.
/// This makes them unsuitable for direct serialization via
/// SPSSerializationTraits, which needs to inspect values twice (once to
/// determine the amount of space to reserve, and then again to serialize).
///
/// The SPSSerializableError type is a helper that can be
/// constructed from an llvm::Error, but inspected more than once.
struct SPSSerializableError {
bool HasError = false;
std::string ErrMsg;
};
/// Helper type for serializing Expected<T>s.
///
/// See SPSSerializableError for more details.
///
// FIXME: Use std::variant for storage once we have c++17.
template <typename T> struct SPSSerializableExpected {
bool HasValue = false;
T Value{};
std::string ErrMsg;
};
inline SPSSerializableError toSPSSerializable(Error Err) {
if (Err)
return {true, toString(std::move(Err))};
return {false, {}};
}
inline Error fromSPSSerializable(SPSSerializableError BSE) {
if (BSE.HasError)
return make_error<StringError>(BSE.ErrMsg);
return Error::success();
}
template <typename T>
SPSSerializableExpected<T> toSPSSerializable(Expected<T> E) {
if (E)
return {true, std::move(*E), {}};
else
return {false, {}, toString(E.takeError())};
}
template <typename T>
Expected<T> fromSPSSerializable(SPSSerializableExpected<T> BSE) {
if (BSE.HasValue)
return std::move(BSE.Value);
else
return make_error<StringError>(BSE.ErrMsg);
}
} // end namespace detail
/// Serialize to a SPSError from a detail::SPSSerializableError.
template <>
class SPSSerializationTraits<SPSError, detail::SPSSerializableError> {
public:
static size_t size(const detail::SPSSerializableError &BSE) {
size_t Size = SPSArgList<bool>::size(BSE.HasError);
if (BSE.HasError)
Size += SPSArgList<SPSString>::size(BSE.ErrMsg);
return Size;
}
static bool serialize(SPSOutputBuffer &OB,
const detail::SPSSerializableError &BSE) {
if (!SPSArgList<bool>::serialize(OB, BSE.HasError))
return false;
if (BSE.HasError)
if (!SPSArgList<SPSString>::serialize(OB, BSE.ErrMsg))
return false;
return true;
}
static bool deserialize(SPSInputBuffer &IB,
detail::SPSSerializableError &BSE) {
if (!SPSArgList<bool>::deserialize(IB, BSE.HasError))
return false;
if (!BSE.HasError)
return true;
return SPSArgList<SPSString>::deserialize(IB, BSE.ErrMsg);
}
};
/// Serialize to a SPSExpected<SPSTagT> from a
/// detail::SPSSerializableExpected<T>.
template <typename SPSTagT, typename T>
class SPSSerializationTraits<SPSExpected<SPSTagT>,
detail::SPSSerializableExpected<T>> {
public:
static size_t size(const detail::SPSSerializableExpected<T> &BSE) {
size_t Size = SPSArgList<bool>::size(BSE.HasValue);
if (BSE.HasValue)
Size += SPSArgList<SPSTagT>::size(BSE.Value);
else
Size += SPSArgList<SPSString>::size(BSE.ErrMsg);
return Size;
}
static bool serialize(SPSOutputBuffer &OB,
const detail::SPSSerializableExpected<T> &BSE) {
if (!SPSArgList<bool>::serialize(OB, BSE.HasValue))
return false;
if (BSE.HasValue)
return SPSArgList<SPSTagT>::serialize(OB, BSE.Value);
return SPSArgList<SPSString>::serialize(OB, BSE.ErrMsg);
}
static bool deserialize(SPSInputBuffer &IB,
detail::SPSSerializableExpected<T> &BSE) {
if (!SPSArgList<bool>::deserialize(IB, BSE.HasValue))
return false;
if (BSE.HasValue)
return SPSArgList<SPSTagT>::deserialize(IB, BSE.Value);
return SPSArgList<SPSString>::deserialize(IB, BSE.ErrMsg);
}
};
/// Serialize to a SPSExpected<SPSTagT> from a detail::SPSSerializableError.
template <typename SPSTagT>
class SPSSerializationTraits<SPSExpected<SPSTagT>,
detail::SPSSerializableError> {
public:
static size_t size(const detail::SPSSerializableError &BSE) {
assert(BSE.HasError && "Cannot serialize expected from a success value");
return SPSArgList<bool>::size(false) +
SPSArgList<SPSString>::size(BSE.ErrMsg);
}
static bool serialize(SPSOutputBuffer &OB,
const detail::SPSSerializableError &BSE) {
assert(BSE.HasError && "Cannot serialize expected from a success value");
if (!SPSArgList<bool>::serialize(OB, false))
return false;
return SPSArgList<SPSString>::serialize(OB, BSE.ErrMsg);
}
};
/// Serialize to a SPSExpected<SPSTagT> from a T.
template <typename SPSTagT, typename T>
class SPSSerializationTraits<SPSExpected<SPSTagT>, T> {
public:
static size_t size(const T &Value) {
return SPSArgList<bool>::size(true) + SPSArgList<SPSTagT>::size(Value);
}
static bool serialize(SPSOutputBuffer &OB, const T &Value) {
if (!SPSArgList<bool>::serialize(OB, true))
return false;
return SPSArgList<SPSTagT>::serialize(Value);
}
};
} // end namespace __orc_rt
#endif // ORC_RT_SIMPLE_PACKED_SERIALIZATION_H