[cfe-dev] source-code representation of an Expr

[Sam]

John,

That works perfectly.  Thank you so much for your help!

Sam

On Wed, Dec 29, 2010 at 4:20 PM, John McCall <rjmccall at apple.com> wrote:

> On Dec 29, 2010, at 12:53 PM, Sam wrote:
> > Yes, I just don't know what to *do* with it ;-) In other words, I don't
> see a clear use of the SourceManager API once I have the SourceRange to
> extract the Expr's source-code.  I don't see any API calls that use
> SourceRange or beginning and ending SourceLocations for source-code
> extraction.
>
> We should probably make some API for this.
>
> What you can do for now is something like the following:
>
>  SourceRange range = expr->getSourceRange();
>  if (range.getBegin().isMacroID() || range.getEnd().isMacroID()) {
>    // handle this case
>  } else if (!sourceManager.isFromSameFile(range.getBegin(),
> range.getEnd())) {
>    // handle this case
>  } else {
>    range.setEnd(preprocessor.getLocForEndOfToken(range.getEnd()));
>    const char *begin = sourceManager.getCharacterData(range.getBegin());
>    const char *end = sourceManager.getCharacterData(range.getEnd());
>    llvm::StringRef string(begin, end - begin);
>    // now you can do whatever you want
>  }
>
> John.
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