HOWTO: use a CXCursor referring a Typedef

Clang Frontend
1

I'm trying to access the newly defined type (CXType), as well as the aliased type, starting from a CXCursor of kind CXCursor_TypedefDecl.

Calling clang_getCursorType() on that cursor yields a type of kind "Invalid". Is that a bug or am I using the wrong function ?

Thanks,
    Stefan

2

I'm trying to access the newly defined type (CXType), as well as the
aliased type, starting from a CXCursor of kind CXCursor_TypedefDecl.

There isn't an API to access just the aliased type as it was written. You can use clang_getCanonicalType() to get down to the canonical form of the type. I'd be fine with adding some kind of clang_getDesugaredType() operation to desugar a given type by one step.

Calling clang_getCursorType() on that cursor yields a type of kind
"Invalid". Is that a bug or am I using the wrong function ?

That's a bug I just fixed in r124133. Thanks!

  - Doug

3

That might be useful indeed.

Given

   typedef int const * const &RPInt;

How can I access the details of the aliased type ? Right now I'm seeing an LValueReference, which I can "unwrap" using clang_getPointeeType multiple times. Is there a way to learn about any involved cv-qualifiers ?

On a somewhat related note: I can't see any type representing arrays, and no way to retrieve the array size(s).
(Array parameters seem to decay to pointer types, which also looks wrong.)

Thanks,
         Stefan

4

CXType doesn’t fully expose the Clang type system, although it could. I’d support the addition of APIs to extract more information from CXTypes.

  • Doug
5

The attached patch adds two new functions clang_isConstQualifiedType and clang_isVolatileQualifiedType. It works fine in the context I tried it in.
How does that look ?

Thanks,
         Stefan

patch (1.84 KB)

6

Index: tools/libclang/CXType.cpp

7

Sure. This revised patch addresses the above points.

     Stefan

patch (3.22 KB)

8

Hi Stefan,

It would also be great to exercise these APIs in c-index-test, so we can regression test them with tests that use c-index-test + FileCheck.

9

Committed (with a test) in r124377. Thanks!

  - Doug