ModuleMaker.cpp revision 31895e73591d3c9ceae731a1274c8f56194b9616
166e7cd0eea6f116f3ed79acb8948c6d8db50833cReid Spencer//===- examples/ModuleMaker/ModuleMaker.cpp - Example project ---*- C++ -*-===// 2237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman// 37db7fa0828bc4ac375032a847b3fd530cef131e2Chris Lattner// The LLVM Compiler Infrastructure 47db7fa0828bc4ac375032a847b3fd530cef131e2Chris Lattner// 5fc001bbfc360ab828e5a4b0cbe4bb7db87361b85Chris Lattner// This file is distributed under the University of Illinois Open Source 6fc001bbfc360ab828e5a4b0cbe4bb7db87361b85Chris Lattner// License. See LICENSE.TXT for details. 7237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman// 87db7fa0828bc4ac375032a847b3fd530cef131e2Chris Lattner//===----------------------------------------------------------------------===// 98ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner// 108ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner// This programs is a simple example that creates an LLVM module "from scratch", 11a99be51bf5cdac1438069d4b01766c47704961c8Gabor Greif// emitting it as a bitcode file to standard out. This is just to show how 128ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner// LLVM projects work and to demonstrate some of the LLVM APIs. 138ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner// 148ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner//===----------------------------------------------------------------------===// 158ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner 168b477ed579794ba6d76915d56b3f448a7dd20120Owen Anderson#include "llvm/LLVMContext.h" 178ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner#include "llvm/Module.h" 188ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner#include "llvm/DerivedTypes.h" 198ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner#include "llvm/Constants.h" 208ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner#include "llvm/Instructions.h" 214bcca0f2ac85c918fc8617e34b7642e5e5233460Chris Lattner#include "llvm/Bitcode/ReaderWriter.h" 224bcca0f2ac85c918fc8617e34b7642e5e5233460Chris Lattner#include <iostream> 23d0fde30ce850b78371fd1386338350591f9ff494Brian Gaekeusing namespace llvm; 24d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 258ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattnerint main() { 268b477ed579794ba6d76915d56b3f448a7dd20120Owen Anderson LLVMContext Context; 278b477ed579794ba6d76915d56b3f448a7dd20120Owen Anderson 288ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // Create the "module" or "program" or "translation unit" to hold the 298ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // function 3031895e73591d3c9ceae731a1274c8f56194b9616Owen Anderson Module *M = new Module("test", Context); 31237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 328ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // Create the main function: first create the type 'int ()' 330fd38069cb6699ce21eb159f22d3f23c012c9e81Chris Lattner FunctionType *FT = FunctionType::get(Type::Int32Ty, /*not vararg*/false); 34237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 358ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // By passing a module as the last parameter to the Function constructor, 368ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // it automatically gets appended to the Module. 37051a950000e21935165db56695e35bade668193bGabor Greif Function *F = Function::Create(FT, Function::ExternalLinkage, "main", M); 38237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 398ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // Add a basic block to the function... again, it automatically inserts 408ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // because of the last argument. 41051a950000e21935165db56695e35bade668193bGabor Greif BasicBlock *BB = BasicBlock::Create("EntryBlock", F); 42237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 438ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // Get pointers to the constant integers... 44db8d2bed6a0ef890b81fabb014bfcb678e891695Reid Spencer Value *Two = ConstantInt::get(Type::Int32Ty, 2); 45db8d2bed6a0ef890b81fabb014bfcb678e891695Reid Spencer Value *Three = ConstantInt::get(Type::Int32Ty, 3); 46237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 478ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // Create the add instruction... does not insert... 487cbd8a3e92221437048b484d5ef9c0a22d0f8c58Gabor Greif Instruction *Add = BinaryOperator::Create(Instruction::Add, Two, Three, 498ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner "addresult"); 50237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 518ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // explicitly insert it into the basic block... 528ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner BB->getInstList().push_back(Add); 53237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 548ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // Create the return instruction and add it to the basic block 55051a950000e21935165db56695e35bade668193bGabor Greif BB->getInstList().push_back(ReturnInst::Create(Add)); 56237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 57a99be51bf5cdac1438069d4b01766c47704961c8Gabor Greif // Output the bitcode file to stdout 584bcca0f2ac85c918fc8617e34b7642e5e5233460Chris Lattner WriteBitcodeToFile(M, std::cout); 59237cef4b0b94b17ca065efad484f386f42579b61Misha Brukman 608ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner // Delete the module and all of its contents. 618ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner delete M; 628ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner return 0; 638ca0eebe4ef4fe810dba5ce91306031272f139cfChris Lattner} 64