forked from OSchip/llvm-project
122 lines
3.9 KiB
C++
122 lines
3.9 KiB
C++
//===-- RemoteJITUtils.h - Utilities for remote-JITing ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Utilities for remote-JITing
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXAMPLES_ORCV2EXAMPLES_LLJITWITHCHILDPROCESS_REMOTEJITUTILS_H
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#define LLVM_EXAMPLES_ORCV2EXAMPLES_LLJITWITHCHILDPROCESS_REMOTEJITUTILS_H
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#include "llvm/ExecutionEngine/Orc/RPC/RawByteChannel.h"
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#include <mutex>
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#if !defined(_MSC_VER) && !defined(__MINGW32__)
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#include <unistd.h>
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#else
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#include <io.h>
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#endif
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/// RPC channel that reads from and writes from file descriptors.
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class FDRawChannel final : public llvm::orc::rpc::RawByteChannel {
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public:
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FDRawChannel(int InFD, int OutFD) : InFD(InFD), OutFD(OutFD) {}
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llvm::Error readBytes(char *Dst, unsigned Size) override {
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assert(Dst && "Attempt to read into null.");
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ssize_t Completed = 0;
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while (Completed < static_cast<ssize_t>(Size)) {
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ssize_t Read = ::read(InFD, Dst + Completed, Size - Completed);
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if (Read <= 0) {
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auto ErrNo = errno;
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if (ErrNo == EAGAIN || ErrNo == EINTR)
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continue;
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else
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return llvm::errorCodeToError(
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std::error_code(errno, std::generic_category()));
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}
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Completed += Read;
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}
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return llvm::Error::success();
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}
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llvm::Error appendBytes(const char *Src, unsigned Size) override {
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assert(Src && "Attempt to append from null.");
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ssize_t Completed = 0;
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while (Completed < static_cast<ssize_t>(Size)) {
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ssize_t Written = ::write(OutFD, Src + Completed, Size - Completed);
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if (Written < 0) {
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auto ErrNo = errno;
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if (ErrNo == EAGAIN || ErrNo == EINTR)
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continue;
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else
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return llvm::errorCodeToError(
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std::error_code(errno, std::generic_category()));
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}
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Completed += Written;
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}
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return llvm::Error::success();
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}
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llvm::Error send() override { return llvm::Error::success(); }
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private:
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int InFD, OutFD;
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};
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// Launch child process and return a channel to it.
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std::unique_ptr<FDRawChannel> launchRemote(std::string ExecPath,
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pid_t &ChildPID) {
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// Create two pipes.
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int PipeFD[2][2];
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if (pipe(PipeFD[0]) != 0 || pipe(PipeFD[1]) != 0)
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perror("Error creating pipe: ");
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ChildPID = fork();
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if (ChildPID == 0) {
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// In the child...
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// Close the parent ends of the pipes
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close(PipeFD[0][1]);
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close(PipeFD[1][0]);
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// Execute the child process.
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std::unique_ptr<char[]> ChildPath, ChildIn, ChildOut;
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{
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ChildPath.reset(new char[ExecPath.size() + 1]);
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std::copy(ExecPath.begin(), ExecPath.end(), &ChildPath[0]);
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ChildPath[ExecPath.size()] = '\0';
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std::string ChildInStr = llvm::utostr(PipeFD[0][0]);
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ChildIn.reset(new char[ChildInStr.size() + 1]);
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std::copy(ChildInStr.begin(), ChildInStr.end(), &ChildIn[0]);
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ChildIn[ChildInStr.size()] = '\0';
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std::string ChildOutStr = llvm::utostr(PipeFD[1][1]);
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ChildOut.reset(new char[ChildOutStr.size() + 1]);
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std::copy(ChildOutStr.begin(), ChildOutStr.end(), &ChildOut[0]);
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ChildOut[ChildOutStr.size()] = '\0';
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}
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char *const args[] = {&ChildPath[0], &ChildIn[0], &ChildOut[0], nullptr};
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int rc = execv(ExecPath.c_str(), args);
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if (rc != 0)
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perror("Error executing child process: ");
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llvm_unreachable("Error executing child process");
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}
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// else we're the parent...
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// Close the child ends of the pipes
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close(PipeFD[0][0]);
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close(PipeFD[1][1]);
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// Return an RPC channel connected to our end of the pipes.
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return std::make_unique<FDRawChannel>(PipeFD[1][0], PipeFD[0][1]);
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}
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#endif
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