| 1 | //===--------------- LLJITWithCustomObjectLinkingLayer.cpp ----------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file shows how to switch LLJIT to use a custom object linking layer (we |
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| 10 | // use ObjectLinkingLayer, which is backed by JITLink, as an example). |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #include "llvm/ADT/StringMap.h" |
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| 15 | #include "llvm/ExecutionEngine/JITLink/JITLinkMemoryManager.h" |
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| 16 | #include "llvm/ExecutionEngine/Orc/LLJIT.h" |
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| 17 | #include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h" |
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| 18 | #include "llvm/Support/InitLLVM.h" |
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| 19 | #include "llvm/Support/TargetSelect.h" |
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| 20 | #include "llvm/Support/raw_ostream.h" |
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| 21 | |
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| 22 | #include "../ExampleModules.h" |
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| 23 | |
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| 24 | using namespace llvm; |
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| 25 | using namespace llvm::orc; |
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| 26 | |
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| 27 | ExitOnError ExitOnErr; |
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| 28 | |
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| 29 | int main(int argc, char *argv[]) { |
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| 30 | // Initialize LLVM. |
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| 31 | InitLLVM X(argc, argv); |
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| 32 | |
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| 33 | InitializeNativeTarget(); |
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| 34 | InitializeNativeTargetAsmPrinter(); |
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| 35 | |
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| 36 | cl::ParseCommandLineOptions(argc, argv, Overview: "LLJITWithCustomObjectLinkingLayer" ); |
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| 37 | ExitOnErr.setBanner(std::string(argv[0]) + ": " ); |
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| 38 | |
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| 39 | // Detect the host and set code model to small. |
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| 40 | auto JTMB = ExitOnErr(JITTargetMachineBuilder::detectHost()); |
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| 41 | JTMB.setCodeModel(CodeModel::Small); |
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| 42 | |
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| 43 | // Create an LLJIT instance with an ObjectLinkingLayer as the base layer. |
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| 44 | auto J = ExitOnErr( |
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| 45 | LLJITBuilder() |
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| 46 | .setJITTargetMachineBuilder(std::move(JTMB)) |
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| 47 | .setObjectLinkingLayerCreator( |
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| 48 | [&](ExecutionSession &ES, const Triple &TT) { |
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| 49 | return std::make_unique<ObjectLinkingLayer>( |
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| 50 | args&: ES, args: ExitOnErr(jitlink::InProcessMemoryManager::Create())); |
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| 51 | }) |
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| 52 | .create()); |
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| 53 | |
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| 54 | auto M = ExitOnErr(parseExampleModule(Source: Add1Example, Name: "add1" )); |
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| 55 | |
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| 56 | ExitOnErr(J->addIRModule(TSM: std::move(M))); |
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| 57 | |
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| 58 | // Look up the JIT'd function, cast it to a function pointer, then call it. |
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| 59 | auto Add1Addr = ExitOnErr(J->lookup(UnmangledName: "add1" )); |
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| 60 | int (*Add1)(int) = Add1Addr.toPtr<int(int)>(); |
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| 61 | |
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| 62 | int Result = Add1(42); |
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| 63 | outs() << "add1(42) = " << Result << "\n" ; |
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| 64 | |
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| 65 | return 0; |
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| 66 | } |
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| 67 | |
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