[cfe-dev] Header Pasting and ASTMatchers

[Farzad Sadeghi via cfe-dev]

also the same is true for PPCallbacks.
what i mean is, if for example, i have a macro in a file that's
included in another file, i see the macro twice. and the
SourceLocation also tells me that the macro's are both in file A and
the file that included File A.
For ASTMatchers in MatchFinder::MatchCallback, the SourcLocation says
that the two copies are in the same header file. My only proof for
this one is that it is being matched twice. And I've tried my theory
for other MatchFinderCallbacks as well. They all act like this now. as
soon as there is a match in the header file, it is matched twice(it is
matched twice since the header file is only included in one other
file).
The Code is from an open-source project on Github.
Would you like me to provide a link?

On 12/12/16, Farzad Sadeghi <thabogre at gmail.com> wrote:
> this is the ASTConsumer:
> class MyFrontendAction : public ASTFrontendAction
> {
> public:
>   MyFrontendAction() {}
>
>   std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
> StringRef file) override
>   {
>
> CI.getPreprocessor().addPPCallbacks(llvm::make_unique<PPInclusion>(&CI.getSourceManager()));
>
>     TheRewriter.setSourceMgr(CI.getSourceManager(), CI.getLangOpts());
>     return llvm::make_unique<MyASTConsumer>(TheRewriter);
>   }
>
> private:
>   Rewriter TheRewriter;
> };
>
> here's the class containing the callbacks:
> class PPInclusion : public PPCallbacks
> {
> public:
>   explicit PPInclusion (SourceManager *SM) : SM(*SM) {}
>
>   /*bunch of callbacks here*/
>
> private:
>   const SourceManager &SM;
> };
>
> On 12/12/16, Benjamin Kramer <benny.kra at gmail.com> wrote:
>> You shouldn't be seeing the AST twice. Can you show the code where you
>> set up PPCallbacks?
>>
>> On Sun, Dec 11, 2016 at 10:23 PM, Farzad Sadeghi via cfe-dev
>> <cfe-dev at lists.llvm.org> wrote:
>>> I have an ASTFronendAction that runs some matchers and has some
>>> PPCallbacks.
>>> Ever since i added the PPCallbacks, I'm getting the AST of a source
>>> file that has the headers actually pasted at the top of it, so if
>>> something's in an included file, i'm matching it twice.
>>> is there a way to check for that when a MatchFinder::Callback is
>>> called or is there a way to tell the Preprocessor to not paste the
>>> headers at the top of the source files that included them?
>>>
>>> --
>>> Farzad Sadeghi
>>> _______________________________________________
>>> cfe-dev mailing list
>>> cfe-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>>
>
>
> --
> Farzad Sadeghi
>


-- 
Farzad Sadeghi