[cfe-dev] Variable scope

[Matthieu Monrocq]

On Sat, Sep 1, 2012 at 6:50 PM, Balou <cleanconcept83 at gmail.com> wrote:

> Thank you James for your answer.
>
> I already tried getDeclContext, getParentFunctionOrMethod and others, but
> I can not retrieve the correct scope in the following case:
>
> int main (int argc, char ** argv)
> {
>   int foo1;
>   {
>     int foo2;
>   }
> }
>
> At declaration, foo2 has a DeclContext whose kind is "Function", which is
> not the correct scope...
>
> Moreover, I see that there is a BlockDecl data structure, but
> VisitBlockDecl don't work, as it seems to works only for objective C block
> (ie ^{...}). Why this don't work for classical c-like blocks ?
>
>
Seeing as Objective-C blocks are in fact lambdas in disguise (or close
enough), if VisitBlockDecl were to also visit regular blocks, it would be
quite confusing => they are really totally different (and unrelated)
concepts.

-- Matthieu


> Finally, I'd like to retrieve the scope of each declared variable in
> termes of SourceRange. How can I get the SourceRange from a DeclContext ?
>
> I'm sorry, but I'm a clang beginner...
> Thank you by advance!
>
> Nicolas
>
>
> 2012/9/1 James Dennett <james.dennett at gmail.com>
>
>> On Sat, Sep 1, 2012 at 8:20 AM, Balou <cleanconcept83 at gmail.com> wrote:
>> > Hello everyone,
>> >
>> > I'm writting some code for visiting variable, struct, ... declarations
>> (I'm
>> > using C Language). For that, my class derives from DeclVisitor. My goal
>> is
>> > to determine the scope of each variable at its declaration (ie inside
>> the
>> > VisitVarDecl method). The method getSourceRangeonly of VarDecl only
>> returns
>> > the range of the declaration in terms of caracters, not the real scope.
>>
>> Right, the notion of a source range is about a position in the source
>> text, not in the AST structure.
>>
>> > Is
>> > there method for getting the VarDecl scope ?
>>
>> You might look at getParentFunctionOrMethod and/or getDeclContext (and
>> if you use getDeclContext you might also want DeclContext::getParent).
>>  I'm assuming here that you're writing C++ code that visits C code,
>> given that you spoke of a class derived from DeclVisitor.
>>
>> -- James
>>
>
>
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