llvm/llvm/examples/HowToUseJIT/HowToUseJIT.cpp

//===-- examples/HowToUseJIT/HowToUseJIT.cpp - An example use of the JIT --===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
//  WARNING: This example demonstrates how to use LLVM's older ExecutionEngine
//           JIT APIs. The newer LLJIT APIs should be preferred for new
//           projects. See llvm/examples/HowToUseLLJIT.
//
//  This small program provides an example of how to quickly build a small
//  module with two functions and execute it with the JIT.
//
// Goal:
//  The goal of this snippet is to create in the memory
//  the LLVM module consisting of two functions as follow: 
//
// int add1(int x) {
//   return x+1;
// }
//
// int foo() {
//   return add1(10);
// }
//
// then compile the module via JIT, then execute the `foo'
// function and return result to a driver, i.e. to a "host program".
//
// Some remarks and questions:
//
// - could we invoke some code using noname functions too?
//   e.g. evaluate "foo()+foo()" without fears to introduce
//   conflict of temporary function name with some real
//   existing function name?
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/STLExtras.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/ExecutionEngine/MCJIT.h"
#include "llvm/IR/Argument.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <memory>
#include <vector>

usingnamespacellvm;

int main() { … }