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

[Jordan Rose]

Careful with this; the body of a for-statement is also within the for statement:

for (int i = 0; i < 10; ++i) {
  ++i, --i;
}

Not familiar with the RecursiveASTVisitor traversal, so I can't tell you exactly how to do it. Maybe you already got this correct.

Jordan


On Jan 8, 2013, at 0:10 , kevinlynx <kevinlynx at gmail.com> wrote:

> 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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> > cfe-dev at cs.uiuc.edu
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> >
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