forked from OSchip/llvm-project
63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
//===- examples/ModuleMaker/ModuleMaker.cpp - Example project ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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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#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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#include <iostream>
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using namespace llvm;
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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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// 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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// 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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// 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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// 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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// 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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// explicitly insert it into the basic block...
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BB->getInstList().push_back(Add);
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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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// Output the bytecode file to stdout
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WriteBytecodeToFile(M, std::cout);
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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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