clang fails replacing a statement if it contains a macro

Question

I\'m using clang to try and parse (with the C++ API) some C++ files and make all the case - break pairs use a specific style.

Example:

*         


        

Answer 1

In oder to get the file location related to the macro expansion, an API function can be used to retrieve the information:

SourceLocation startLoc = rewriter.getSourceMgr().getFileLoc(
    declaration_statement->getLocStart());
SourceLocation endLoc = rewriter.getSourceMgr().getFileLoc(
    declaration_statement->getLocEnd());

This API function does the same as what Marco wrote in his code, but automatically.

If we look at the implementation of the function getFileLoc():

This is the description of the function: Given Loc, if it is a macro location return the expansion location or the spelling location, depending on if it comes from a macro argument or not.

 SourceLocation getFileLoc(SourceLocation Loc) const {
     if (Loc.isFileID()) return Loc;
         return getFileLocSlowCase(Loc);
 }

SourceLocation SourceManager::getFileLocSlowCase(SourceLocation Loc) const {
    do {
        if (isMacroArgExpansion(Loc))
            Loc = getImmediateSpellingLoc(Loc);
        else
            Loc = getImmediateExpansionRange(Loc).first;
    } while (!Loc.isFileID());
    return Loc;
}