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//===- llvm/ExecutionEngine/Orc/RawByteChannel.h ----------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_ORC_RAWBYTECHANNEL_H
#define LLVM_EXECUTIONENGINE_ORC_RAWBYTECHANNEL_H
#include "llvm/ADT/StringRef.h"
#include "llvm/ExecutionEngine/Orc/RPCSerialization.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include <cstdint>
#include <mutex>
#include <string>
#include <type_traits>
namespace llvm {
namespace orc {
namespace rpc {
/// Interface for byte-streams to be used with RPC.
class RawByteChannel {
public:
virtual ~RawByteChannel() = default;
/// Read Size bytes from the stream into *Dst.
virtual Error readBytes(char *Dst, unsigned Size) = 0;
/// Read size bytes from *Src and append them to the stream.
virtual Error appendBytes(const char *Src, unsigned Size) = 0;
/// Flush the stream if possible.
virtual Error send() = 0;
/// Notify the channel that we're starting a message send.
/// Locks the channel for writing.
template <typename FunctionIdT, typename SequenceIdT>
Error startSendMessage(const FunctionIdT &FnId, const SequenceIdT &SeqNo) {
writeLock.lock();
if (auto Err = serializeSeq(*this, FnId, SeqNo)) {
writeLock.unlock();
return Err;
}
return Error::success();
}
/// Notify the channel that we're ending a message send.
/// Unlocks the channel for writing.
Error endSendMessage() {
writeLock.unlock();
return Error::success();
}
/// Notify the channel that we're starting a message receive.
/// Locks the channel for reading.
template <typename FunctionIdT, typename SequenceNumberT>
Error startReceiveMessage(FunctionIdT &FnId, SequenceNumberT &SeqNo) {
readLock.lock();
if (auto Err = deserializeSeq(*this, FnId, SeqNo)) {
readLock.unlock();
return Err;
}
return Error::success();
}
/// Notify the channel that we're ending a message receive.
/// Unlocks the channel for reading.
Error endReceiveMessage() {
readLock.unlock();
return Error::success();
}
/// Get the lock for stream reading.
std::mutex &getReadLock() { return readLock; }
/// Get the lock for stream writing.
std::mutex &getWriteLock() { return writeLock; }
private:
std::mutex readLock, writeLock;
};
template <typename ChannelT, typename T>
class SerializationTraits<
ChannelT, T, T,
typename std::enable_if<
std::is_base_of<RawByteChannel, ChannelT>::value &&
(std::is_same<T, uint8_t>::value || std::is_same<T, int8_t>::value ||
std::is_same<T, uint16_t>::value || std::is_same<T, int16_t>::value ||
std::is_same<T, uint32_t>::value || std::is_same<T, int32_t>::value ||
std::is_same<T, uint64_t>::value || std::is_same<T, int64_t>::value ||
std::is_same<T, char>::value)>::type> {
public:
static Error serialize(ChannelT &C, T V) {
support::endian::byte_swap<T, support::big>(V);
return C.appendBytes(reinterpret_cast<const char *>(&V), sizeof(T));
};
static Error deserialize(ChannelT &C, T &V) {
if (auto Err = C.readBytes(reinterpret_cast<char *>(&V), sizeof(T)))
return Err;
support::endian::byte_swap<T, support::big>(V);
return Error::success();
};
};
template <typename ChannelT>
class SerializationTraits<ChannelT, bool, bool,
typename std::enable_if<std::is_base_of<
RawByteChannel, ChannelT>::value>::type> {
public:
static Error serialize(ChannelT &C, bool V) {
uint8_t Tmp = V ? 1 : 0;
if (auto Err =
C.appendBytes(reinterpret_cast<const char *>(&Tmp), 1))
return Err;
return Error::success();
}
static Error deserialize(ChannelT &C, bool &V) {
uint8_t Tmp = 0;
if (auto Err = C.readBytes(reinterpret_cast<char *>(&Tmp), 1))
return Err;
V = Tmp != 0;
return Error::success();
}
};
template <typename ChannelT>
class SerializationTraits<ChannelT, std::string, StringRef,
typename std::enable_if<std::is_base_of<
RawByteChannel, ChannelT>::value>::type> {
public:
/// RPC channel serialization for std::strings.
static Error serialize(RawByteChannel &C, StringRef S) {
if (auto Err = serializeSeq(C, static_cast<uint64_t>(S.size())))
return Err;
return C.appendBytes((const char *)S.data(), S.size());
}
};
template <typename ChannelT, typename T>
class SerializationTraits<ChannelT, std::string, T,
typename std::enable_if<
std::is_base_of<RawByteChannel, ChannelT>::value &&
(std::is_same<T, const char*>::value ||
std::is_same<T, char*>::value)>::type> {
public:
static Error serialize(RawByteChannel &C, const char *S) {
return SerializationTraits<ChannelT, std::string, StringRef>::serialize(C,
S);
}
};
template <typename ChannelT>
class SerializationTraits<ChannelT, std::string, std::string,
typename std::enable_if<std::is_base_of<
RawByteChannel, ChannelT>::value>::type> {
public:
/// RPC channel serialization for std::strings.
static Error serialize(RawByteChannel &C, const std::string &S) {
return SerializationTraits<ChannelT, std::string, StringRef>::serialize(C,
S);
}
/// RPC channel deserialization for std::strings.
static Error deserialize(RawByteChannel &C, std::string &S) {
uint64_t Count = 0;
if (auto Err = deserializeSeq(C, Count))
return Err;
S.resize(Count);
return C.readBytes(&S[0], Count);
}
};
} // end namespace rpc
} // end namespace orc
} // end namespace llvm
#endif // LLVM_EXECUTIONENGINE_ORC_RAWBYTECHANNEL_H
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