[Ada] Implement C++ ABI for dispatch tables on IA-64

Eric Botcazou ebotcazou@adacore.com
Tue Apr 8 18:22:00 GMT 2008


Dispatch tables are the exact equivalent in Ada of virtual tables in C++.
GNAT already implements the C++ ABI when interfacing with C++, but on IA-64
it was lacking the support for descriptors in virtual tables as specified in
  http://www.codesourcery.com/cxx-abi/abi.html#vtable
Technically this boils down to honoring TARGET_VTABLE_USES_DESCRIPTORS.

Tested on i586-suse-linux, applied on the mainline.


2008-04-08  Eric Botcazou  <ebotcazou@adacore.com>

	* gigi.h (standard_datatypes): Add ADT_fdesc_type and ADT_null_fdesc.
	(fdesc_type_node): Define.
	(null_fdesc_node): Likewise.
	* decl.c (gnat_to_gnu_entity) <E_Access_Subprogram_Type>: If the target
	uses descriptors for vtables and the type comes from a dispatch table,
	return the descriptor type.
	* trans.c (Attribute_to_gnu) <Attr_Unrestricted_Access>: If the target
	uses descriptors for vtables and the type comes from a dispatch table,
	build a descriptor in the static case and copy the existing one in the
	non-static case.
	(gnat_to_gnu) <N_Null>: If the target uses descriptors for vtables and
	the type is a pointer-to-subprogram coming from a dispatch table,
	return the null descriptor.
	<N_Unchecked_Type_Conversion>: If the target uses descriptors for
	vtables, the source type is the descriptor type and the target type is
	a pointer type, first build the pointer.
	* utils.c (init_gigi_decls): If the target uses descriptors for vtables
	build the descriptor type and the null descriptor.


-- 
Eric Botcazou
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