[cfe-dev] SourceLocation TODO

[caiwei]

Taking a look at the ObjC Rewriter for examples, I want to change the operator * to << (source to source) . 
 
I create a new BinaryOperator and replace the Expr .
 
 
   rhs = new IntegerLiteral( Res, BO->getRHS()->getType(), BO->getRHS()->getExprLoc() );

// change * to <<    
   Replacement = new BinaryOperator(BO->getLHS(), rhs, 
                                    BO->Shl, BO->getType(), BO->getLHS()->getExprLoc());
//replace the expression   
   assert( !Rewrite.ReplaceStmt(BO, Replacement) );
 
 
but the output SourceLocation  has some problem in the result source code, when there are two  * Operateor more.

 
 
==================================
 
 Stmt *RewriteCai::RewriteBinaryOperator(BinaryOperator *BO)
{
    Expr *Replacement, *rhs, *temp;
    
    
    temp = BO->getRHS();
 
  if( BO->isMultiplicativeOp() )
   {    
    llvm::APSInt Res(32);
 
    SourceLocation ll = BO->getRHS()->getExprLoc();

    if( (BO->getRHS())->isIntegerConstantExpr( Res, *Context, &ll, true) )
     {
        int a = Res.getZExtValue();
        if((a&(a-1))==0) Res = Res.logBase2();
 
      //new right-child subExpr
       rhs = new IntegerLiteral( Res, BO->getRHS()->getType(), BO->getRHS()->getExprLoc() );
     
       assert(rhs);
         
     }
  else
    {
     rhs = temp;
  
     }
   // change * to <<    
   Replacement = new BinaryOperator(BO->getLHS(), rhs, 
                                    BO->Shl, BO->getType(), BO->getLHS()->getExprLoc());
   
   assert(!Rewrite.ReplaceStmt(BO, Replacement));
     
  
  delete BO;
  return Replacement;

  }
 
 return 0;
}
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