1 //===- llvm/ExecutionEngine/Orc/RPCSerialization.h --------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_EXECUTIONENGINE_ORC_RPCSERIALIZATION_H
11 #define LLVM_EXECUTIONENGINE_ORC_RPCSERIALIZATION_H
14 #include "llvm/Support/thread.h"
26 /// TypeNameSequence is a utility for rendering sequences of types to a string
27 /// by rendering each type, separated by ", ".
28 template <typename... ArgTs> class RPCTypeNameSequence {};
30 /// Render an empty TypeNameSequence to an ostream.
31 template <typename OStream>
32 OStream &operator<<(OStream &OS, const RPCTypeNameSequence<> &V) {
36 /// Render a TypeNameSequence of a single type to an ostream.
37 template <typename OStream, typename ArgT>
38 OStream &operator<<(OStream &OS, const RPCTypeNameSequence<ArgT> &V) {
39 OS << RPCTypeName<ArgT>::getName();
43 /// Render a TypeNameSequence of more than one type to an ostream.
44 template <typename OStream, typename ArgT1, typename ArgT2, typename... ArgTs>
46 operator<<(OStream &OS, const RPCTypeNameSequence<ArgT1, ArgT2, ArgTs...> &V) {
47 OS << RPCTypeName<ArgT1>::getName() << ", "
48 << RPCTypeNameSequence<ArgT2, ArgTs...>();
53 class RPCTypeName<void> {
55 static const char* getName() { return "void"; }
59 class RPCTypeName<int8_t> {
61 static const char* getName() { return "int8_t"; }
65 class RPCTypeName<uint8_t> {
67 static const char* getName() { return "uint8_t"; }
71 class RPCTypeName<int16_t> {
73 static const char* getName() { return "int16_t"; }
77 class RPCTypeName<uint16_t> {
79 static const char* getName() { return "uint16_t"; }
83 class RPCTypeName<int32_t> {
85 static const char* getName() { return "int32_t"; }
89 class RPCTypeName<uint32_t> {
91 static const char* getName() { return "uint32_t"; }
95 class RPCTypeName<int64_t> {
97 static const char* getName() { return "int64_t"; }
101 class RPCTypeName<uint64_t> {
103 static const char* getName() { return "uint64_t"; }
107 class RPCTypeName<bool> {
109 static const char* getName() { return "bool"; }
113 class RPCTypeName<std::string> {
115 static const char* getName() { return "std::string"; }
119 class RPCTypeName<Error> {
121 static const char* getName() { return "Error"; }
124 template <typename T>
125 class RPCTypeName<Expected<T>> {
127 static const char* getName() {
128 std::lock_guard<std::mutex> Lock(NameMutex);
130 raw_string_ostream(Name) << "Expected<"
131 << RPCTypeNameSequence<T>()
137 static std::mutex NameMutex;
138 static std::string Name;
141 template <typename T>
142 std::mutex RPCTypeName<Expected<T>>::NameMutex;
144 template <typename T>
145 std::string RPCTypeName<Expected<T>>::Name;
147 template <typename T1, typename T2>
148 class RPCTypeName<std::pair<T1, T2>> {
150 static const char* getName() {
151 std::lock_guard<std::mutex> Lock(NameMutex);
153 raw_string_ostream(Name) << "std::pair<" << RPCTypeNameSequence<T1, T2>()
158 static std::mutex NameMutex;
159 static std::string Name;
162 template <typename T1, typename T2>
163 std::mutex RPCTypeName<std::pair<T1, T2>>::NameMutex;
164 template <typename T1, typename T2>
165 std::string RPCTypeName<std::pair<T1, T2>>::Name;
167 template <typename... ArgTs>
168 class RPCTypeName<std::tuple<ArgTs...>> {
170 static const char* getName() {
171 std::lock_guard<std::mutex> Lock(NameMutex);
173 raw_string_ostream(Name) << "std::tuple<"
174 << RPCTypeNameSequence<ArgTs...>() << ">";
178 static std::mutex NameMutex;
179 static std::string Name;
182 template <typename... ArgTs>
183 std::mutex RPCTypeName<std::tuple<ArgTs...>>::NameMutex;
184 template <typename... ArgTs>
185 std::string RPCTypeName<std::tuple<ArgTs...>>::Name;
187 template <typename T>
188 class RPCTypeName<std::vector<T>> {
190 static const char*getName() {
191 std::lock_guard<std::mutex> Lock(NameMutex);
193 raw_string_ostream(Name) << "std::vector<" << RPCTypeName<T>::getName()
199 static std::mutex NameMutex;
200 static std::string Name;
203 template <typename T>
204 std::mutex RPCTypeName<std::vector<T>>::NameMutex;
205 template <typename T>
206 std::string RPCTypeName<std::vector<T>>::Name;
209 /// The SerializationTraits<ChannelT, T> class describes how to serialize and
210 /// deserialize an instance of type T to/from an abstract channel of type
211 /// ChannelT. It also provides a representation of the type's name via the
214 /// Specializations of this class should provide the following functions:
218 /// static const char* getName();
219 /// static Error serialize(ChannelT&, const T&);
220 /// static Error deserialize(ChannelT&, T&);
224 /// The third argument of SerializationTraits is intended to support SFINAE.
229 /// class MyVirtualChannel { ... };
231 /// template <DerivedChannelT>
232 /// class SerializationTraits<DerivedChannelT, bool,
233 /// typename std::enable_if<
234 /// std::is_base_of<VirtChannel, DerivedChannel>::value
237 /// static const char* getName() { ... };
241 template <typename ChannelT, typename WireType,
242 typename ConcreteType = WireType, typename = void>
243 class SerializationTraits;
245 template <typename ChannelT>
246 class SequenceTraits {
248 static Error emitSeparator(ChannelT &C) { return Error::success(); }
249 static Error consumeSeparator(ChannelT &C) { return Error::success(); }
252 /// Utility class for serializing sequences of values of varying types.
253 /// Specializations of this class contain 'serialize' and 'deserialize' methods
254 /// for the given channel. The ArgTs... list will determine the "over-the-wire"
255 /// types to be serialized. The serialize and deserialize methods take a list
256 /// CArgTs... ("caller arg types") which must be the same length as ArgTs...,
257 /// but may be different types from ArgTs, provided that for each CArgT there
258 /// is a SerializationTraits specialization
259 /// SerializeTraits<ChannelT, ArgT, CArgT> with methods that can serialize the
260 /// caller argument to over-the-wire value.
261 template <typename ChannelT, typename... ArgTs>
262 class SequenceSerialization;
264 template <typename ChannelT>
265 class SequenceSerialization<ChannelT> {
267 static Error serialize(ChannelT &C) { return Error::success(); }
268 static Error deserialize(ChannelT &C) { return Error::success(); }
271 template <typename ChannelT, typename ArgT>
272 class SequenceSerialization<ChannelT, ArgT> {
275 template <typename CArgT>
276 static Error serialize(ChannelT &C, CArgT &&CArg) {
277 return SerializationTraits<ChannelT, ArgT,
278 typename std::decay<CArgT>::type>::
279 serialize(C, std::forward<CArgT>(CArg));
282 template <typename CArgT>
283 static Error deserialize(ChannelT &C, CArgT &CArg) {
284 return SerializationTraits<ChannelT, ArgT, CArgT>::deserialize(C, CArg);
288 template <typename ChannelT, typename ArgT, typename... ArgTs>
289 class SequenceSerialization<ChannelT, ArgT, ArgTs...> {
292 template <typename CArgT, typename... CArgTs>
293 static Error serialize(ChannelT &C, CArgT &&CArg,
294 CArgTs &&... CArgs) {
296 SerializationTraits<ChannelT, ArgT, typename std::decay<CArgT>::type>::
297 serialize(C, std::forward<CArgT>(CArg)))
299 if (auto Err = SequenceTraits<ChannelT>::emitSeparator(C))
301 return SequenceSerialization<ChannelT, ArgTs...>::
302 serialize(C, std::forward<CArgTs>(CArgs)...);
305 template <typename CArgT, typename... CArgTs>
306 static Error deserialize(ChannelT &C, CArgT &CArg,
309 SerializationTraits<ChannelT, ArgT, CArgT>::deserialize(C, CArg))
311 if (auto Err = SequenceTraits<ChannelT>::consumeSeparator(C))
313 return SequenceSerialization<ChannelT, ArgTs...>::deserialize(C, CArgs...);
317 template <typename ChannelT, typename... ArgTs>
318 Error serializeSeq(ChannelT &C, ArgTs &&... Args) {
319 return SequenceSerialization<ChannelT, typename std::decay<ArgTs>::type...>::
320 serialize(C, std::forward<ArgTs>(Args)...);
323 template <typename ChannelT, typename... ArgTs>
324 Error deserializeSeq(ChannelT &C, ArgTs &... Args) {
325 return SequenceSerialization<ChannelT, ArgTs...>::deserialize(C, Args...);
328 template <typename ChannelT>
329 class SerializationTraits<ChannelT, Error> {
332 using WrappedErrorSerializer =
333 std::function<Error(ChannelT &C, const ErrorInfoBase&)>;
335 using WrappedErrorDeserializer =
336 std::function<Error(ChannelT &C, Error &Err)>;
338 template <typename ErrorInfoT, typename SerializeFtor,
339 typename DeserializeFtor>
340 static void registerErrorType(std::string Name, SerializeFtor Serialize,
341 DeserializeFtor Deserialize) {
342 assert(!Name.empty() &&
343 "The empty string is reserved for the Success value");
345 const std::string *KeyName = nullptr;
347 // We're abusing the stability of std::map here: We take a reference to the
348 // key of the deserializers map to save us from duplicating the string in
349 // the serializer. This should be changed to use a stringpool if we switch
350 // to a map type that may move keys in memory.
351 std::lock_guard<std::recursive_mutex> Lock(DeserializersMutex);
353 Deserializers.insert(Deserializers.begin(),
354 std::make_pair(std::move(Name),
355 std::move(Deserialize)));
360 assert(KeyName != nullptr && "No keyname pointer");
361 std::lock_guard<std::recursive_mutex> Lock(SerializersMutex);
362 // FIXME: Move capture Serialize once we have C++14.
363 Serializers[ErrorInfoT::classID()] =
364 [KeyName, Serialize](ChannelT &C, const ErrorInfoBase &EIB) -> Error {
365 assert(EIB.dynamicClassID() == ErrorInfoT::classID() &&
366 "Serializer called for wrong error type");
367 if (auto Err = serializeSeq(C, *KeyName))
369 return Serialize(C, static_cast<const ErrorInfoT&>(EIB));
374 static Error serialize(ChannelT &C, Error &&Err) {
375 std::lock_guard<std::recursive_mutex> Lock(SerializersMutex);
378 return serializeSeq(C, std::string());
380 return handleErrors(std::move(Err),
381 [&C](const ErrorInfoBase &EIB) {
382 auto SI = Serializers.find(EIB.dynamicClassID());
383 if (SI == Serializers.end())
384 return serializeAsStringError(C, EIB);
385 return (SI->second)(C, EIB);
389 static Error deserialize(ChannelT &C, Error &Err) {
390 std::lock_guard<std::recursive_mutex> Lock(DeserializersMutex);
393 if (auto Err = deserializeSeq(C, Key))
397 ErrorAsOutParameter EAO(&Err);
398 Err = Error::success();
399 return Error::success();
402 auto DI = Deserializers.find(Key);
403 assert(DI != Deserializers.end() && "No deserializer for error type");
404 return (DI->second)(C, Err);
409 static Error serializeAsStringError(ChannelT &C, const ErrorInfoBase &EIB) {
412 raw_string_ostream ErrMsgStream(ErrMsg);
413 EIB.log(ErrMsgStream);
415 return serialize(C, make_error<StringError>(std::move(ErrMsg),
416 inconvertibleErrorCode()));
419 static std::recursive_mutex SerializersMutex;
420 static std::recursive_mutex DeserializersMutex;
421 static std::map<const void*, WrappedErrorSerializer> Serializers;
422 static std::map<std::string, WrappedErrorDeserializer> Deserializers;
425 template <typename ChannelT>
426 std::recursive_mutex SerializationTraits<ChannelT, Error>::SerializersMutex;
428 template <typename ChannelT>
429 std::recursive_mutex SerializationTraits<ChannelT, Error>::DeserializersMutex;
431 template <typename ChannelT>
432 std::map<const void*,
433 typename SerializationTraits<ChannelT, Error>::WrappedErrorSerializer>
434 SerializationTraits<ChannelT, Error>::Serializers;
436 template <typename ChannelT>
437 std::map<std::string,
438 typename SerializationTraits<ChannelT, Error>::WrappedErrorDeserializer>
439 SerializationTraits<ChannelT, Error>::Deserializers;
441 /// Registers a serializer and deserializer for the given error type on the
442 /// given channel type.
443 template <typename ChannelT, typename ErrorInfoT, typename SerializeFtor,
444 typename DeserializeFtor>
445 void registerErrorSerialization(std::string Name, SerializeFtor &&Serialize,
446 DeserializeFtor &&Deserialize) {
447 SerializationTraits<ChannelT, Error>::template registerErrorType<ErrorInfoT>(
449 std::forward<SerializeFtor>(Serialize),
450 std::forward<DeserializeFtor>(Deserialize));
453 /// Registers serialization/deserialization for StringError.
454 template <typename ChannelT>
455 void registerStringError() {
456 static bool AlreadyRegistered = false;
457 if (!AlreadyRegistered) {
458 registerErrorSerialization<ChannelT, StringError>(
460 [](ChannelT &C, const StringError &SE) {
461 return serializeSeq(C, SE.getMessage());
463 [](ChannelT &C, Error &Err) -> Error {
464 ErrorAsOutParameter EAO(&Err);
466 if (auto E2 = deserializeSeq(C, Msg))
469 make_error<StringError>(std::move(Msg),
471 OrcErrorCode::UnknownErrorCodeFromRemote));
472 return Error::success();
474 AlreadyRegistered = true;
478 /// SerializationTraits for Expected<T1> from an Expected<T2>.
479 template <typename ChannelT, typename T1, typename T2>
480 class SerializationTraits<ChannelT, Expected<T1>, Expected<T2>> {
483 static Error serialize(ChannelT &C, Expected<T2> &&ValOrErr) {
485 if (auto Err = serializeSeq(C, true))
487 return SerializationTraits<ChannelT, T1, T2>::serialize(C, *ValOrErr);
489 if (auto Err = serializeSeq(C, false))
491 return serializeSeq(C, ValOrErr.takeError());
494 static Error deserialize(ChannelT &C, Expected<T2> &ValOrErr) {
495 ExpectedAsOutParameter<T2> EAO(&ValOrErr);
497 if (auto Err = deserializeSeq(C, HasValue))
500 return SerializationTraits<ChannelT, T1, T2>::deserialize(C, *ValOrErr);
501 Error Err = Error::success();
502 if (auto E2 = deserializeSeq(C, Err))
504 ValOrErr = std::move(Err);
505 return Error::success();
509 /// SerializationTraits for Expected<T1> from a T2.
510 template <typename ChannelT, typename T1, typename T2>
511 class SerializationTraits<ChannelT, Expected<T1>, T2> {
514 static Error serialize(ChannelT &C, T2 &&Val) {
515 return serializeSeq(C, Expected<T2>(std::forward<T2>(Val)));
519 /// SerializationTraits for Expected<T1> from an Error.
520 template <typename ChannelT, typename T>
521 class SerializationTraits<ChannelT, Expected<T>, Error> {
524 static Error serialize(ChannelT &C, Error &&Err) {
525 return serializeSeq(C, Expected<T>(std::move(Err)));
529 /// SerializationTraits default specialization for std::pair.
530 template <typename ChannelT, typename T1, typename T2>
531 class SerializationTraits<ChannelT, std::pair<T1, T2>> {
533 static Error serialize(ChannelT &C, const std::pair<T1, T2> &V) {
534 return serializeSeq(C, V.first, V.second);
537 static Error deserialize(ChannelT &C, std::pair<T1, T2> &V) {
538 return deserializeSeq(C, V.first, V.second);
542 /// SerializationTraits default specialization for std::tuple.
543 template <typename ChannelT, typename... ArgTs>
544 class SerializationTraits<ChannelT, std::tuple<ArgTs...>> {
547 /// RPC channel serialization for std::tuple.
548 static Error serialize(ChannelT &C, const std::tuple<ArgTs...> &V) {
549 return serializeTupleHelper(C, V, llvm::index_sequence_for<ArgTs...>());
552 /// RPC channel deserialization for std::tuple.
553 static Error deserialize(ChannelT &C, std::tuple<ArgTs...> &V) {
554 return deserializeTupleHelper(C, V, llvm::index_sequence_for<ArgTs...>());
558 // Serialization helper for std::tuple.
559 template <size_t... Is>
560 static Error serializeTupleHelper(ChannelT &C, const std::tuple<ArgTs...> &V,
561 llvm::index_sequence<Is...> _) {
562 return serializeSeq(C, std::get<Is>(V)...);
565 // Serialization helper for std::tuple.
566 template <size_t... Is>
567 static Error deserializeTupleHelper(ChannelT &C, std::tuple<ArgTs...> &V,
568 llvm::index_sequence<Is...> _) {
569 return deserializeSeq(C, std::get<Is>(V)...);
573 /// SerializationTraits default specialization for std::vector.
574 template <typename ChannelT, typename T>
575 class SerializationTraits<ChannelT, std::vector<T>> {
578 /// Serialize a std::vector<T> from std::vector<T>.
579 static Error serialize(ChannelT &C, const std::vector<T> &V) {
580 if (auto Err = serializeSeq(C, static_cast<uint64_t>(V.size())))
583 for (const auto &E : V)
584 if (auto Err = serializeSeq(C, E))
587 return Error::success();
590 /// Deserialize a std::vector<T> to a std::vector<T>.
591 static Error deserialize(ChannelT &C, std::vector<T> &V) {
593 if (auto Err = deserializeSeq(C, Count))
598 if (auto Err = deserializeSeq(C, E))
601 return Error::success();
605 } // end namespace rpc
606 } // end namespace orc
607 } // end namespace llvm
609 #endif // LLVM_EXECUTIONENGINE_ORC_RPCSERIALIZATION_H