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+//===- ModuleMaker.cpp - Example project which creates modules --*- C++ -*-===//
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+//
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+// This programs is a simple example that creates an LLVM module "from scratch",
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+// emitting it as a bytecode file to standard out. This is just to show how
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+// LLVM projects work and to demonstrate some of the LLVM APIs.
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+//
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+//===----------------------------------------------------------------------===//
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+
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+#include "llvm/Module.h"
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+#include "llvm/DerivedTypes.h"
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+#include "llvm/Constants.h"
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+#include "llvm/Instructions.h"
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+#include "llvm/Bytecode/Writer.h"
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+
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+int main() {
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+ // Create the "module" or "program" or "translation unit" to hold the
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+ // function
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+ Module *M = new Module("test");
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+
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+ // Create the main function: first create the type 'int ()'
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+ FunctionType *FT = FunctionType::get(Type::IntTy, std::vector<const Type*>(),
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+ /*not vararg*/false);
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+
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+ // By passing a module as the last parameter to the Function constructor,
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+ // it automatically gets appended to the Module.
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+ Function *F = new Function(FT, Function::ExternalLinkage, "main", M);
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+
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+ // Add a basic block to the function... again, it automatically inserts
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+ // because of the last argument.
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+ BasicBlock *BB = new BasicBlock("EntryBlock", F);
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+
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+ // Get pointers to the constant integers...
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+ Value *Two = ConstantSInt::get(Type::IntTy, 2);
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+ Value *Three = ConstantSInt::get(Type::IntTy, 3);
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+
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+ // Create the add instruction... does not insert...
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+ Instruction *Add = BinaryOperator::create(Instruction::Add, Two, Three,
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+ "addresult");
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+
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+ // explicitly insert it into the basic block...
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+ BB->getInstList().push_back(Add);
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+
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+ // Create the return instruction and add it to the basic block
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+ BB->getInstList().push_back(new ReturnInst(Add));
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+
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+ // Output the bytecode file to stdout
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+ WriteBytecodeToFile(M, std::cout);
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+
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+ // Delete the module and all of its contents.
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+ delete M;
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+ return 0;
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+}
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