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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375269 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
//===-- LLJITWithJITLink.cpp - Configure LLJIT to use ObjectLinkingLayer --===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file shows how to switch LLJIT to use ObjectLinkingLayer (which is
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// backed by JITLink) rather than RTDyldObjectLinkingLayer (which is backed by
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// RuntimeDyld). Using JITLink as the underlying allocator enables use of
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// small code model in JIT'd code.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ExecutionEngine/JITLink/JITLinkMemoryManager.h"
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#include "llvm/ExecutionEngine/Orc/LLJIT.h"
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#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/raw_ostream.h"
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#include "../ExampleModules.h"
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using namespace llvm;
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using namespace llvm::orc;
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ExitOnError ExitOnErr;
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int main(int argc, char *argv[]) {
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// Initialize LLVM.
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InitLLVM X(argc, argv);
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InitializeNativeTarget();
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InitializeNativeTargetAsmPrinter();
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cl::ParseCommandLineOptions(argc, argv, "HowToUseLLJIT");
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ExitOnErr.setBanner(std::string(argv[0]) + ": ");
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// Define an in-process JITLink memory manager.
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jitlink::InProcessMemoryManager MemMgr;
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// Detect the host and set code model to small.
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auto JTMB = ExitOnErr(JITTargetMachineBuilder::detectHost());
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JTMB.setCodeModel(CodeModel::Small);
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// Create an LLJIT instance with an ObjectLinkingLayer as the base layer.
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auto J =
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ExitOnErr(LLJITBuilder()
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.setJITTargetMachineBuilder(std::move(JTMB))
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.setObjectLinkingLayerCreator([&](ExecutionSession &ES,
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const Triple &TT) {
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return std::make_unique<ObjectLinkingLayer>(ES, MemMgr);
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})
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.create());
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auto M = ExitOnErr(parseExampleModule(Add1Example, "add1"));
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ExitOnErr(J->addIRModule(std::move(M)));
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// Look up the JIT'd function, cast it to a function pointer, then call it.
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auto Add1Sym = ExitOnErr(J->lookup("add1"));
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int (*Add1)(int) = (int (*)(int))Add1Sym.getAddress();
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int Result = Add1(42);
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outs() << "add1(42) = " << Result << "\n";
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return 0;
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}
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