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 }
76