record: Differentiate disguised vs pointer types

[ocrete]

Disguised types are not pointers, they're just typedefs to a private struct, while pointer types are typedef to a pointer to a private struct. Generate the right code for each.

In C, there are 2 types of "disguised" typdefs:
typedef struct _Blob *Blob
and
typedef struct _Blob Blob

In Gir files, they're both called "disguised", but the first kind also has the "pointer" property set. The current generator only knows about the pointer type.

Currently, it generates
pub type Blob = *mut _Blob;

But , it should do pub type Blob = _Blob for the non-pointer type.

The effect of this bug is that the rest of the code gen will think that the type is a pointer to a pointer.

So it will generate functions with a signature of fn func(*mut *mut blob) instead of fn func(*mut blob)

[MarijnS95]

Thinking out loud, I'm curious if this would help out with mapping Vulkan types in gir.

[bilelmoussaoui]

Was this actually tested? it makes the gtk4-rs build fail with the following

error[E0277]: the trait bound `_GtkConstraintTargetInterface: std::marker::Copy` is not satisfied
   --> gtk4/src/subclass/constraint_target.rs:11:38
    |
11  | unsafe impl<T: ConstraintTargetImpl> IsImplementable<T> for ConstraintTarget {
    |                                      ^^^^^^^^^^^^^^^^^^ the trait `std::marker::Copy` is not implemented for `_GtkConstraintTargetInterface`
    |
note: required by a bound in `glib::subclass::types::IsImplementable`
   --> /home/bilalelmoussaoui/.cargo/git/checkouts/gtk-rs-core-7be42ca38bd6361c/38f4ba1/glib/src/subclass/types.rs:287:42
    |
285 | pub unsafe trait IsImplementable<T: ObjectSubclass>: IsInterface
    |                  --------------- required by a bound in this trait
286 | where
287 |     <Self as ObjectType>::GlibClassType: Copy,
    |                                          ^^^^ required by this bound in `IsImplementable`

error[E0277]: the trait bound `_GtkNativeInterface: std::marker::Copy` is not satisfied
   --> gtk4/src/subclass/native.rs:10:28
    |
10  | unsafe impl<T: NativeImpl> IsImplementable<T> for Native {}
    |                            ^^^^^^^^^^^^^^^^^^ the trait `std::marker::Copy` is not implemented for `_GtkNativeInterface`
    |
note: required by a bound in `glib::subclass::types::IsImplementable`
   --> /home/bilalelmoussaoui/.cargo/git/checkouts/gtk-rs-core-7be42ca38bd6361c/38f4ba1/glib/src/subclass/types.rs:287:42
    |
285 | pub unsafe trait IsImplementable<T: ObjectSubclass>: IsInterface
    |                  --------------- required by a bound in this trait
286 | where
287 |     <Self as ObjectType>::GlibClassType: Copy,
    |                                          ^^^^ required by this bound in `IsImplementable`

error[E0277]: the trait bound `_GtkRootInterface: std::marker::Copy` is not satisfied
   --> gtk4/src/subclass/root.rs:10:26
    |
10  | unsafe impl<T: RootImpl> IsImplementable<T> for Root {}
    |                          ^^^^^^^^^^^^^^^^^^ the trait `std::marker::Copy` is not implemented for `_GtkRootInterface`
    |
note: required by a bound in `glib::subclass::types::IsImplementable`
   --> /home/bilalelmoussaoui/.cargo/git/checkouts/gtk-rs-core-7be42ca38bd6361c/38f4ba1/glib/src/subclass/types.rs:287:42
    |
285 | pub unsafe trait IsImplementable<T: ObjectSubclass>: IsInterface
    |                  --------------- required by a bound in this trait
286 | where
287 |     <Self as ObjectType>::GlibClassType: Copy,
    |                                          ^^^^ required by this bound in `IsImplementable`

[ocrete]

I think the bindings were incorrect, in all of those cases, the interface struct is defined in private C headers, so I don't think they can be implemented outside of GTK+ itself,.

[sdroege]

Yes, the failures look correct. These are all interfaces that can't be implemented outside of GTK itself.