//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This contains code to emit Expr nodes as LLVM code.
//
//===----------------------------------------------------------------------===//

#include "CodeGenFunction.h"
#include "clang/AST/AST.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
using namespace llvm;
using namespace clang;
using namespace CodeGen;


//===--------------------------------------------------------------------===//
//                             Expression Emission
//===--------------------------------------------------------------------===//

ExprResult CodeGenFunction::EmitExpr(const Expr *E) {
  assert(E && "Null expression?");
  
  switch (E->getStmtClass()) {
  default:
    printf("Unimplemented expr!\n");
    E->dump();
    return ExprResult::get(UndefValue::get(llvm::Type::Int32Ty));
  case Stmt::ParenExprClass:
    return EmitExpr(cast<ParenExpr>(E)->getSubExpr());
  case Stmt::IntegerLiteralClass:
    return EmitIntegerLiteral(cast<IntegerLiteral>(E)); 
  }
  
}

ExprResult CodeGenFunction::EmitIntegerLiteral(const IntegerLiteral *E) {
  return ExprResult::get(ConstantInt::get(E->getValue()));
}