llvm/examples/OrcV2Examples/LLJITWithCustomObjectLinkingLayer/LLJITWithCustomObjectLinkingLayer.cpp

   1 //===--------------- LLJITWithCustomObjectLinkingLayer.cpp ----------------===//
   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 // This file shows how to switch LLJIT to use a custom object linking layer (we
  10 // use ObjectLinkingLayer, which is backed by JITLink, as an example).
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/ADT/StringMap.h"
  15 #include "llvm/ExecutionEngine/JITLink/JITLinkMemoryManager.h"
  16 #include "llvm/ExecutionEngine/Orc/LLJIT.h"
  17 #include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
  18 #include "llvm/Support/InitLLVM.h"
  19 #include "llvm/Support/TargetSelect.h"
  20 #include "llvm/Support/raw_ostream.h"
  21
  22 #include "../ExampleModules.h"
  23
  24 using namespace llvm;
  25 using namespace llvm::orc;
  26
  27 ExitOnError ExitOnErr;
  28
  29 int main(int argc, char *argv[]) {
  30   // Initialize LLVM.
  31   InitLLVM X(argc, argv);
  32
  33   InitializeNativeTarget();
  34   InitializeNativeTargetAsmPrinter();
  35
  36   cl::ParseCommandLineOptions(argc, argv, "LLJITWithCustomObjectLinkingLayer");
  37   ExitOnErr.setBanner(std::string(argv[0]) + ": ");
  38
  39   // Detect the host and set code model to small.
  40   auto JTMB = ExitOnErr(JITTargetMachineBuilder::detectHost());
  41   JTMB.setCodeModel(CodeModel::Small);
  42
  43   // Create an LLJIT instance with an ObjectLinkingLayer as the base layer.
  44   auto J = ExitOnErr(
  45       LLJITBuilder()
  46           .setJITTargetMachineBuilder(std::move(JTMB))
  47           .setObjectLinkingLayerCreator(
  48               [&](ExecutionSession &ES, const Triple &TT) {
  49                 return std::make_unique<ObjectLinkingLayer>(
  50                     ES, ExitOnErr(jitlink::InProcessMemoryManager::Create()));
  51               })
  52           .create());
  53
  54   auto M = ExitOnErr(parseExampleModule(Add1Example, "add1"));
  55
  56   ExitOnErr(J->addIRModule(std::move(M)));
  57
  58   // Look up the JIT'd function, cast it to a function pointer, then call it.
  59   auto Add1Addr = ExitOnErr(J->lookup("add1"));
  60   int (*Add1)(int) = Add1Addr.toPtr<int(int)>();
  61
  62   int Result = Add1(42);
  63   outs() << "add1(42) = " << Result << "\n";
  64
  65   return 0;
  66 }