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Diffstat (limited to 'examples/ModuleMaker/ModuleMaker.cpp')
| -rw-r--r-- | examples/ModuleMaker/ModuleMaker.cpp | 61 | 
1 files changed, 61 insertions, 0 deletions
| diff --git a/examples/ModuleMaker/ModuleMaker.cpp b/examples/ModuleMaker/ModuleMaker.cpp new file mode 100644 index 000000000000..154e24065c0a --- /dev/null +++ b/examples/ModuleMaker/ModuleMaker.cpp @@ -0,0 +1,61 @@ +//===- examples/ModuleMaker/ModuleMaker.cpp - Example project ---*- C++ -*-===// +// +//                     The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This programs is a simple example that creates an LLVM module "from scratch", +// emitting it as a bitcode file to standard out.  This is just to show how +// LLVM projects work and to demonstrate some of the LLVM APIs. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Module.h" +#include "llvm/DerivedTypes.h" +#include "llvm/Constants.h" +#include "llvm/Instructions.h" +#include "llvm/Bitcode/ReaderWriter.h" +#include <iostream> +using namespace llvm; + +int main() { +  // Create the "module" or "program" or "translation unit" to hold the +  // function +  Module *M = new Module("test"); + +  // Create the main function: first create the type 'int ()' +  FunctionType *FT = FunctionType::get(Type::Int32Ty, std::vector<const Type*>(), +                                       /*not vararg*/false); + +  // By passing a module as the last parameter to the Function constructor, +  // it automatically gets appended to the Module. +  Function *F = Function::Create(FT, Function::ExternalLinkage, "main", M); + +  // Add a basic block to the function... again, it automatically inserts +  // because of the last argument. +  BasicBlock *BB = BasicBlock::Create("EntryBlock", F); + +  // Get pointers to the constant integers... +  Value *Two = ConstantInt::get(Type::Int32Ty, 2); +  Value *Three = ConstantInt::get(Type::Int32Ty, 3); + +  // Create the add instruction... does not insert... +  Instruction *Add = BinaryOperator::Create(Instruction::Add, Two, Three, +                                            "addresult"); + +  // explicitly insert it into the basic block... +  BB->getInstList().push_back(Add); + +  // Create the return instruction and add it to the basic block +  BB->getInstList().push_back(ReturnInst::Create(Add)); + +  // Output the bitcode file to stdout +  WriteBitcodeToFile(M, std::cout); + +  // Delete the module and all of its contents. +  delete M; +  return 0; +} | 
