[cfe-dev] check an AST node's parent node ?

[kevinlynx]

Thanks, I use TraverseForStmt to solve this problem. And this makes me know TraverseXXX methods better. 




------------------ Original ------------------
From:  "Philip Craig"<philipjcraig at gmail.com>;
Date:  Tue, Jan 8, 2013 03:47 PM
To:  "kevinlynx"<kevinlynx at gmail.com>; 
Cc:  "cfe-dev"<cfe-dev at cs.uiuc.edu>; 
Subject:  Re: [cfe-dev] check an AST node's parent node ?



On 8 January 2013 16:48, kevinlynx <kevinlynx at gmail.com> wrote:
> In my coding standard checking tool, it limits comma expression usage,
> except in a for statment, i.e:
>
>     x++, x+=1; // this will be marked as invalid usage
>     for (x = 0, y = 0; ...) // but this comma expression is valid
>
> I can implement `VisitBinComma`, this function will be called when parsed
> comma expression. But how to know if this comma expression is in a for
> statment ?

The simplest way is to implement TraverseForStmt, and set a flag to
indicate you are within a for statement.

Another option may be to use a ParentMap
(http://clang.llvm.org/doxygen/classclang_1_1ParentMap.html). I
haven't experimented with it yet though.

>
> Thanks.
>
>
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