[cfe-dev] Finding function declaration?

[Manuel Klimek]

Ah, wrong parent map :) the ast context has a function to retrieve parents
that supports crossing into decls. I can look up the details when I'm back
at a real computer ...

BTW do you need the symbolic execution engine for what you want to check?
If the ast is enough consider using a clang-tidy check, those are a bit
simpler to write with the ast matchers.

On Thu, May 14, 2015, 1:20 PM Ben Laurie <benl at google.com> wrote:

> Manuel asked me for more info.
>
> Given a checker like this:
>
> class MyChecker :
>     public Checker< check::PreStmt<ReturnStmt> > {
> public:
>   void checkPreStmt(const ReturnStmt *RS, CheckerContext &C) const;
> };
>
> void MyChecker::checkPreStmt(const ReturnStmt *RS,
>      CheckerContext &C) const {
>   RS->dump();
>
>   const Stmt *s = RS;
>
>   ParentMap &PM = C.getLocationContext()->getParentMap();
>
>   while ((s = PM.getParent(s)) != NULL) {
>     std::cerr << "------\n";
>     s->dump();
>   }
> }
>
> And this as input:
>
> int f(void)
>     {
>     return 1;
>     }
>
>
> This is the output:
>
> ReturnStmt 0x807cbdda8
> `-IntegerLiteral 0x807cbdd88 'int' 1
> ------
> CompoundStmt 0x807cbddc0
> `-ReturnStmt 0x807cbdda8
>   `-IntegerLiteral 0x807cbdd88 'int' 1
>
> As you can see, it terminates at the function body, not the declaration.
>
>
> On 14 May 2015 at 07:03, Ben Laurie <benl at google.com> wrote:
>
>>
>>
>> On 11 May 2015 at 11:20, Manuel Klimek <klimek at google.com> wrote:
>>
>>> On Sun, May 10, 2015 at 11:54 PM Nikola Smiljanic <popizdeh at gmail.com>
>>> wrote:
>>>
>>>> I think you'll need to use ParentMap from ASTContext.
>>>>
>>>
>>> Note that the parent-map is lazy-built (that is, the first time you get
>>> a parent, you build the parent-map for the whole TU), and thus has a pretty
>>> high cost. Usually we first try to get away with not using it.
>>>
>>> Can you give a bit more context on what you're trying to do?
>>>
>>
>> Sorry for delay ... I am trying to label functions to have certain checks
>> done on their return values if an attribute is set on the function.
>>
>> ParentMap appears not to work for this case (it stops finding parents
>> once you have the function body).
>>
>> Currently, the only way I could make this work was to construct a map of
>> function bodies that have the attribute set in an AST observer, and then
>> using ParentMap to get back to the body, which is looked up in the map.
>>
>> Doesn't seem optimal!
>>
>>
>>>
>>>>
>>>> On Mon, May 11, 2015 at 4:18 AM, Ben Laurie <benl at google.com> wrote:
>>>>
>>>>> If I have a checker for check::PreStmt<ReturnStmt>, how do I get from
>>>>> the ReturnStmt to the function it is part of (I want to check
>>>>> attributes on that function)?
>>>>> _______________________________________________
>>>>> cfe-dev mailing list
>>>>> cfe-dev at cs.uiuc.edu
>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>>>>>
>>>>
>>>> _______________________________________________
>>>> cfe-dev mailing list
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>>>>
>>>
>>
>
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