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//===------ SimpleRemoteEPCUtils.cpp - Utils for Simple Remote EPC --------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Message definitions and other utilities for SimpleRemoteEPC and
// SimpleRemoteEPCServer.
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/Shared/SimpleRemoteEPCUtils.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/FormatVariadic.h"
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#else
#include <io.h>
#endif
namespace {
struct FDMsgHeader {
static constexpr unsigned MsgSizeOffset = 0;
static constexpr unsigned OpCOffset = MsgSizeOffset + sizeof(uint64_t);
static constexpr unsigned SeqNoOffset = OpCOffset + sizeof(uint64_t);
static constexpr unsigned TagAddrOffset = SeqNoOffset + sizeof(uint64_t);
static constexpr unsigned Size = TagAddrOffset + sizeof(uint64_t);
};
} // namespace
namespace llvm {
namespace orc {
namespace SimpleRemoteEPCDefaultBootstrapSymbolNames {
const char *ExecutorSessionObjectName =
"__llvm_orc_SimpleRemoteEPC_dispatch_ctx";
const char *DispatchFnName = "__llvm_orc_SimpleRemoteEPC_dispatch_fn";
} // end namespace SimpleRemoteEPCDefaultBootstrapSymbolNames
SimpleRemoteEPCTransportClient::~SimpleRemoteEPCTransportClient() {}
SimpleRemoteEPCTransport::~SimpleRemoteEPCTransport() {}
Expected<std::unique_ptr<FDSimpleRemoteEPCTransport>>
FDSimpleRemoteEPCTransport::Create(SimpleRemoteEPCTransportClient &C, int InFD,
int OutFD) {
#if LLVM_ENABLE_THREADS
if (InFD == -1)
return make_error<StringError>("Invalid input file descriptor " +
Twine(InFD),
inconvertibleErrorCode());
if (OutFD == -1)
return make_error<StringError>("Invalid output file descriptor " +
Twine(OutFD),
inconvertibleErrorCode());
std::unique_ptr<FDSimpleRemoteEPCTransport> FDT(
new FDSimpleRemoteEPCTransport(C, InFD, OutFD));
return std::move(FDT);
#else
return make_error<StringError>("FD-based SimpleRemoteEPC transport requires "
"thread support, but llvm was built with "
"LLVM_ENABLE_THREADS=Off",
inconvertibleErrorCode());
#endif
}
FDSimpleRemoteEPCTransport::~FDSimpleRemoteEPCTransport() {
#if LLVM_ENABLE_THREADS
ListenerThread.join();
#endif
}
Error FDSimpleRemoteEPCTransport::start() {
#if LLVM_ENABLE_THREADS
ListenerThread = std::thread([this]() { listenLoop(); });
return Error::success();
#endif
llvm_unreachable("Should not be called with LLVM_ENABLE_THREADS=Off");
}
Error FDSimpleRemoteEPCTransport::sendMessage(SimpleRemoteEPCOpcode OpC,
uint64_t SeqNo,
ExecutorAddr TagAddr,
ArrayRef<char> ArgBytes) {
char HeaderBuffer[FDMsgHeader::Size];
*((support::ulittle64_t *)(HeaderBuffer + FDMsgHeader::MsgSizeOffset)) =
FDMsgHeader::Size + ArgBytes.size();
*((support::ulittle64_t *)(HeaderBuffer + FDMsgHeader::OpCOffset)) =
static_cast<uint64_t>(OpC);
*((support::ulittle64_t *)(HeaderBuffer + FDMsgHeader::SeqNoOffset)) = SeqNo;
*((support::ulittle64_t *)(HeaderBuffer + FDMsgHeader::TagAddrOffset)) =
TagAddr.getValue();
std::lock_guard<std::mutex> Lock(M);
if (Disconnected)
return make_error<StringError>("FD-transport disconnected",
inconvertibleErrorCode());
if (int ErrNo = writeBytes(HeaderBuffer, FDMsgHeader::Size))
return errorCodeToError(std::error_code(ErrNo, std::generic_category()));
if (int ErrNo = writeBytes(ArgBytes.data(), ArgBytes.size()))
return errorCodeToError(std::error_code(ErrNo, std::generic_category()));
return Error::success();
}
void FDSimpleRemoteEPCTransport::disconnect() {
if (Disconnected)
return; // Return if already disconnected.
Disconnected = true;
bool CloseOutFD = InFD != OutFD;
// Close InFD.
while (close(InFD) == -1) {
if (errno == EBADF)
break;
}
// Close OutFD.
if (CloseOutFD) {
while (close(OutFD) == -1) {
if (errno == EBADF)
break;
}
}
}
static Error makeUnexpectedEOFError() {
return make_error<StringError>("Unexpected end-of-file",
inconvertibleErrorCode());
}
Error FDSimpleRemoteEPCTransport::readBytes(char *Dst, size_t Size,
bool *IsEOF) {
assert(Dst && "Attempt to read into null.");
ssize_t Completed = 0;
while (Completed < static_cast<ssize_t>(Size)) {
ssize_t Read = ::read(InFD, Dst + Completed, Size - Completed);
if (Read <= 0) {
auto ErrNo = errno;
if (Read == 0) {
if (Completed == 0 && IsEOF) {
*IsEOF = true;
return Error::success();
} else
return makeUnexpectedEOFError();
} else if (ErrNo == EAGAIN || ErrNo == EINTR)
continue;
else {
std::lock_guard<std::mutex> Lock(M);
if (Disconnected && IsEOF) { // disconnect called, pretend this is EOF.
*IsEOF = true;
return Error::success();
}
return errorCodeToError(
std::error_code(ErrNo, std::generic_category()));
}
}
Completed += Read;
}
return Error::success();
}
int FDSimpleRemoteEPCTransport::writeBytes(const char *Src, size_t Size) {
assert(Src && "Attempt to append from null.");
ssize_t Completed = 0;
while (Completed < static_cast<ssize_t>(Size)) {
ssize_t Written = ::write(OutFD, Src + Completed, Size - Completed);
if (Written < 0) {
auto ErrNo = errno;
if (ErrNo == EAGAIN || ErrNo == EINTR)
continue;
else
return ErrNo;
}
Completed += Written;
}
return 0;
}
void FDSimpleRemoteEPCTransport::listenLoop() {
Error Err = Error::success();
do {
char HeaderBuffer[FDMsgHeader::Size];
// Read the header buffer.
{
bool IsEOF = false;
if (auto Err2 = readBytes(HeaderBuffer, FDMsgHeader::Size, &IsEOF)) {
Err = joinErrors(std::move(Err), std::move(Err2));
break;
}
if (IsEOF)
break;
}
// Decode header buffer.
uint64_t MsgSize;
SimpleRemoteEPCOpcode OpC;
uint64_t SeqNo;
ExecutorAddr TagAddr;
MsgSize =
*((support::ulittle64_t *)(HeaderBuffer + FDMsgHeader::MsgSizeOffset));
OpC = static_cast<SimpleRemoteEPCOpcode>(static_cast<uint64_t>(
*((support::ulittle64_t *)(HeaderBuffer + FDMsgHeader::OpCOffset))));
SeqNo =
*((support::ulittle64_t *)(HeaderBuffer + FDMsgHeader::SeqNoOffset));
TagAddr.setValue(
*((support::ulittle64_t *)(HeaderBuffer + FDMsgHeader::TagAddrOffset)));
if (MsgSize < FDMsgHeader::Size) {
Err = joinErrors(std::move(Err),
make_error<StringError>("Message size too small",
inconvertibleErrorCode()));
break;
}
// Read the argument bytes.
SimpleRemoteEPCArgBytesVector ArgBytes;
ArgBytes.resize(MsgSize - FDMsgHeader::Size);
if (auto Err2 = readBytes(ArgBytes.data(), ArgBytes.size())) {
Err = joinErrors(std::move(Err), std::move(Err2));
break;
}
if (auto Action = C.handleMessage(OpC, SeqNo, TagAddr, ArgBytes)) {
if (*Action == SimpleRemoteEPCTransportClient::EndSession)
break;
} else {
Err = joinErrors(std::move(Err), Action.takeError());
break;
}
} while (true);
// Attempt to close FDs, set Disconnected to true so that subsequent
// sendMessage calls fail.
disconnect();
// Call up to the client to handle the disconnection.
C.handleDisconnect(std::move(Err));
}
} // end namespace orc
} // end namespace llvm
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