[Bug default/30334] New: Support DW_TAG_iterface_type DIEs (for languages like D and Java)

["dodji at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30334

            Bug ID: 30334
           Summary: Support DW_TAG_iterface_type DIEs (for languages like
                    D and Java)
           Product: libabigail
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: dodji at redhat dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

The D language as well as the Java language support "interface" types.

These can be generally implemented using the DW_TAG_interface_type DIE.

Libabigail currently doesn't support this DIE.

It could support it by constructing an abigail::ir::class_decl type, with a
abigail::ir::class_decl::is_interface() accessor that returns true if the class
is an interface.

That interface would thus allow only abstract member functions and constant
data members.

Here is what the DWARF 5 spec says:

5.7.2 Interface Type Entries
The Java language defines “interface” types. An interface in Java is similar to
a C++ or Java class with only abstract methods and constant data members.

Interface types are represented by debugging information entries with the tag
DW_TAG_interface_type.
An interface type entry has a DW_AT_name attribute, whose value is a
null-terminated string containing the type name.
[...]

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