llvm/tools/lli/ChildTarget/ChildTarget.cpp

   1 //===----------- ChildTarget.cpp - Out-of-proc executor for lli -----------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Simple out-of-process executor for lli.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.h"
  14 #include "llvm/ExecutionEngine/Orc/TargetProcess/RegisterEHFrames.h"
  15 #include "llvm/ExecutionEngine/Orc/TargetProcess/SimpleExecutorMemoryManager.h"
  16 #include "llvm/ExecutionEngine/Orc/TargetProcess/SimpleRemoteEPCServer.h"
  17 #include "llvm/Support/DynamicLibrary.h"
  18 #include "llvm/Support/Error.h"
  19 #include "llvm/Support/MathExtras.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 #include <cstring>
  22 #include <sstream>
  23
  24 using namespace llvm;
  25 using namespace llvm::orc;
  26
  27 ExitOnError ExitOnErr;
  28
  29 int main(int argc, char *argv[]) {
  30 #if LLVM_ENABLE_THREADS
  31
  32   if (argc != 3) {
  33     errs() << "Usage: " << argv[0] << " <input fd> <output fd>\n";
  34     return 1;
  35   }
  36
  37   if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr)) {
  38     errs() << "Error loading program symbols.\n";
  39     return 1;
  40   }
  41
  42   ExitOnErr.setBanner(std::string(argv[0]) + ": ");
  43
  44   int InFD = 0;
  45   int OutFD = 0;
  46   {
  47     std::istringstream InFDStream(argv[1]), OutFDStream(argv[2]);
  48     InFDStream >> InFD;
  49     OutFDStream >> OutFD;
  50   }
  51
  52   auto Server =
  53       ExitOnErr(SimpleRemoteEPCServer::Create<FDSimpleRemoteEPCTransport>(
  54           [](SimpleRemoteEPCServer::Setup &S) -> Error {
  55             S.setDispatcher(
  56                 std::make_unique<SimpleRemoteEPCServer::ThreadDispatcher>());
  57             S.bootstrapSymbols() =
  58                 SimpleRemoteEPCServer::defaultBootstrapSymbols();
  59             S.services().push_back(
  60                 std::make_unique<rt_bootstrap::SimpleExecutorMemoryManager>());
  61             return Error::success();
  62           },
  63           InFD, OutFD));
  64
  65   ExitOnErr(Server->waitForDisconnect());
  66
  67   return 0;
  68
  69 #else
  70   errs() << argv[0]
  71          << " error: this tool requires threads, but LLVM was "
  72             "built with LLVM_ENABLE_THREADS=Off\n";
  73   return 1;
  74 #endif
  75 }