llvm/llvm/examples/OrcV2Examples/LLJITWithLazyReexports/LLJITWithLazyReexports.cpp

//===--- LLJITWithLazyReexports.cpp - LLJIT example with custom laziness --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// In this example we will use the lazy re-exports utility to lazily compile
// IR modules. We will do this in seven steps:
//
// 1. Create an LLJIT instance.
// 2. Install a transform so that we can see what is being compiled.
// 3. Create an indirect stubs manager and lazy call-through manager.
// 4. Add two modules that will be conditionally compiled, plus a main module.
// 5. Add lazy-rexports of the symbols in the conditionally compiled modules.
// 6. Dump the ExecutionSession state to see the symbol table prior to
//    executing any code.
// 7. Verify that only modules containing executed code are compiled.
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/StringMap.h"
#include "llvm/ExecutionEngine/JITLink/JITLinkMemoryManager.h"
#include "llvm/ExecutionEngine/Orc/LLJIT.h"
#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"

#include "../ExampleModules.h"

usingnamespacellvm;
usingnamespacellvm::orc;

ExitOnError ExitOnErr;

// Example IR modules.
//
// Note that in the conditionally compiled modules, FooMod and BarMod, functions
// have been given an _body suffix. This is to ensure that their names do not
// clash with their lazy-reexports.
// For clients who do not wish to rename function bodies (e.g. because they want
// to re-use cached objects between static and JIT compiles) techniques exist to
// avoid renaming. See the lazy-reexports section of the ORCv2 design doc.

const llvm::StringRef FooMod = …;

const llvm::StringRef BarMod = …;

const llvm::StringRef MainMod = …;

cl::list<std::string> InputArgv(cl::Positional,
                                cl::desc("<program arguments>..."));

int main(int argc, char *argv[]) { … }