[cfe-dev] Rewriter object is not resetting correctly

[victor]

Hello,

I'm having a strange problem with my clang tool and I would like to report it because maybe I'm doing something wrong, but it might be a bug. 

My tool simply takes a source file, performs a change in the code and saves the new version. The program is under the version control system git and the new version is stored in a new git branch. This process is done a finite number of times and I reset the Rewriter object between a version and the next one (so that the change is not present in the rest of versions) in the following way:

Rewrite = Rewriter();
Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOpts());

Everything seemed to work right, but the other day I tested my tool with a program and I found something really strange. The problem is that the first and only the first change performed in the code remains in all the following versiones. For instance, if I insert a comment in each of the lines:

Original:
int method(int a){
    int b = a + 1;
    return b;
}

First version:
/*1*/ int method(int a){
    int b = a + 1;
    return b;
}

Second version:
/*1*/ int method(int a){
/*2*/      int b = a + 1;
          return b;
}

Third version:
/*1*/ int method(int a){
          int b = a + 1;
/*3*/    return b;
}


The problem is that the comment "/*1*/" should be only in the first version, but not in the rest. As you can see, "/*2*/" is not in the third version and that is the expected.  

I have tried a lot of things, but nothing seems to solve this issue that only appears in this and other program that I tested today.

What could be happening here?

Thanks in advance.
 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20140609/afd8faa2/attachment.html>