mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 11:42:57 +01:00
62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
//===- 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;
|
|
}
|