[cfe-dev] Getting ASTContext within an AST Matcher

[Manuel Klimek]

On Mon, Nov 26, 2012 at 9:46 PM, Vane, Edwin <edwin.vane at intel.com> wrote:

> Hi all,
>
> I'm writing an AST Matcher that operates on Expr. I'd like to use
> isNullPointerConstant() but it requires an ASTContext. In the past I've
> been able to get an ASTContext from a Decl subclassed object using
> Decl::getASTContext() but that clearly won't work with Expr. So how does
> one get access to the ASTContext in my situation? Must the matcher
> mechanism be modified to provide the ASTContext to matchers?


The MatchFinder::MatchResult has a field Context.


> How global is an ASTContext? Given the name it seems to imply there's one
> context for one particular AST the matchers are being run on. If so it
> should be pretty easy to modify the matcher mechanism to provide this info,
> perhaps through MatchFinder.
>

Assessment correct :)

Cheers,
/Manuel


>
> --
> Edwin Vane
>   Software Developer
>   Intel of Canada, Inc.
>
>
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