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+//===- ModuleMaker.cpp - Example project which creates modules --*- C++ -*-===//
+//
+// This programs is a simple example that creates an LLVM module "from scratch",
+// emitting it as a bytecode 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/Bytecode/Writer.h"
+
+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::IntTy, 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 = new Function(FT, Function::ExternalLinkage, "main", M);
+
+ // Add a basic block to the function... again, it automatically inserts
+ // because of the last argument.
+ BasicBlock *BB = new BasicBlock("EntryBlock", F);
+
+ // Get pointers to the constant integers...
+ Value *Two = ConstantSInt::get(Type::IntTy, 2);
+ Value *Three = ConstantSInt::get(Type::IntTy, 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(new ReturnInst(Add));
+
+ // Output the bytecode file to stdout
+ WriteBytecodeToFile(M, std::cout);
+
+ // Delete the module and all of its contents.
+ delete M;
+ return 0;
+}