[cfe-dev] How do I retrieve all non-local variables a function has access to?

Artem Dergachev via cfe-dev cfe-dev at lists.llvm.org
Sun Jul 21 08:04:12 PDT 2019

Note that match() doesn't automatically recursively descend into the 
node. So it should be either matchAST(varDecl()) or 

Generally, though, i'd recommend taking a look at DeclContext's methods 
to see if you have anything readily available. Or, at least, you should 
probably take a look how DeclContext::lookup() is implemented.

On 7/21/19 3:42 AM, Kristóf Umann via cfe-dev wrote:
> Hi!
> I'm trying to implement a primitive reaching definitions algorithm for 
> C++, but am struggling a bit. I'd like to make all function calls be 
> definitions of global/static variables, but I can't seem to retrieve 
> them.
> I tried using AST matchers (match() to be precise) on a 
> TranslationUnitDecl, but I can't seem to be able to match varDecl()s 
> at all. Is there a reason for this? When I use clang-query, "m 
> varDecl()" works like a charm, but match() doesn't seem to.
> In any case, I can retrieve local variables by matching declStmt() and 
> some non-local ones when inspecting the LHS of assignments (I need to 
> do this anyways to find all definitions), but I feel like I'm not the 
> first person trying to recover all accessible variables to a function. 
> Could anyone give me some guidance please? :)
> Cheers!
> Kristóf
> P.S. This is the patch I'm working on: https://reviews.llvm.org/D64991
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