[cfe-dev] From addMatcher(varDecl(...)) -> callExpr

[Allan Nielsen]

Hi,

(let me know if requests like this should go to the "users" list instead)

I'm playing around with the tooling facilities in clang, and have been
using RemoveCStrCalls.cpp as an example.

Here is the problem I'm trying to solve:

I have a set of variables of a given type, I would like to refactor to use
another type. To do this, I need to change the template arguments, and
re-organize the arguments to the constructor.

Example:

Say we have: Foo<int, long> my_foo(1, 2);

We want: Bar<my_int, my_long> my_bar(my_int(1), my_long(2));

To find all the instances of Foo, I have written a matcher like this:

  Finder.addMatcher(
      id("foo_instance",
         varDecl(hasType(recordDecl(hasName("::Foo"))))),
      &Callback);

In my callback function I have managed to get access to the template
arguments as I wanted to, and I got access to the instance name. So far so
good...

But I can not figure out how I get access to the constructor arguments. I
think I want to convert the VarDecl type to a CallExpr but I'm not sure
that this is the right approach.

In my callback rutine I have the following code:

const VarDecl *decl = Result.Nodes.getNodeAs<VarDecl>("foo_instance");
auto expr = decl->getInit();

And then I do not know how to continue...

A hint will be most appreciated.

Best regards
Allan W. Nielsen
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