Initial checkin of ModuleMaker project

[oota-llvm.git] / projects / SmallExamples / ModuleMaker / tools / ModuleMaker / ModuleMaker.cpp

diff --git a/projects/SmallExamples/ModuleMaker/tools/ModuleMaker/ModuleMaker.cpp b/projects/SmallExamples/ModuleMaker/tools/ModuleMaker/ModuleMaker.cpp
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+++ b/projects/SmallExamples/ModuleMaker/tools/ModuleMaker/ModuleMaker.cpp
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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;
+}