[cfe-dev] ObjC Block call checker

[Alexander Smirnov via cfe-dev]

For future references.

In that particular case it will be enough to check if Call has declaration

Call.getDecl()

and throw an error only if there is no declaration.

On Tue, Mar 8, 2016 at 7:26 PM, Alexander Smirnov <alexander at smirn0v.ru>
wrote:

> As far as I understand I should extend existing NullabilityChecker and use
> propagated 'nullability' attribute. Seems to be the only way to understand
> probability that the block is null.
>
> Still will be happy to get your thoughts on this.
>
> On Sun, Mar 6, 2016 at 11:50 PM, Alexander Smirnov <alexander at smirn0v.ru>
> wrote:
>
>> Hello,
>>
>> I'm trying to add ObjC clang analyzer checker to check if called block is
>> non null.
>>
>> I thought that at some ProgramState SVal for the called block will be
>> constrained to null and that's all I need to check.
>>
>> I was naive.
>>
>> Here is code of the checker: http://pastebin.com/raw/dcE12ayk
>> But it reports error even for simple code like:
>>
>> void(^bl)(void) = ^{};
>> bl();
>>
>> That's caused by the fact that for my checker SVal for "bl" is
>> "underconstrained".
>>
>> Could please someone lead me on the right examples from current checkers?
>> Or explain, what am I doing wrong ?
>>
>
>
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