[cfe-dev] Source rewrite

steve naroff snaroff at apple.com
Thu Dec 17 05:23:19 PST 2009

On Dec 17, 2009, at 7:05 AM, Abramo Bagnara wrote:

> In an application that uses clang libraries we need to transform some
> specially written comments in C construct.
> e.g:
> int p() {
> 	int a = 3;
> 	/* #instrument(a)# */
> }
> should be parsed as
> int p() {
> 	int a = 3;
> 	instrument(a);
> }
> I've added a CommentHandler to Preprocessor to catch comments and I
> thought to use Rewriter class to manipulate the input buffer inserting
> after the comment the text to be parsed, but then I've realized that
> Rewriter class is not designed to rewrite lexer input buffers, but to
> build a separate object where original text and changes live together.
> Now I'm a bit confused: what's the proper way to cope with the need
> described above?

Hi Abramo,

The ASTContext class has a 'Comments' member that contains all the  
SourceRanges's for all comments in the source file.

This assumes you've told the preprocessor to keep comments.

This might not be the only/proper way, however I thought you should be  
aware of this...


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