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
24using namespace llvm;
25using namespace llvm::orc;
26
27ExitOnError ExitOnErr;
28
29int 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, std::make_unique<jitlink::InProcessMemoryManager>());
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 Add1Sym = ExitOnErr(J->lookup("add1"));
60 int (*Add1)(int) = (int (*)(int))Add1Sym.getAddress();
61
62 int Result = Add1(42);
63 outs() << "add1(42) = " << Result << "\n";
64
65 return 0;
66}
67