DWARF: describe properly Ada packed arrays

gcc/ada/ChangeLog:

	* gcc-interface/ada-tree.h
	(TYPE_IMPLEMENTS_PACKED_ARRAY_P, TYPE_CAN_HAVE_DEBUG_TYPE_P,
	TYPE_ORIGINAL_PACKED_ARRAY, SET_TYPE_ORIGINAL_PACKED_ARRAY): New
	macros.
	* gcc-interface/decl.c (add_parallel_type_for_packed_array):
	Rename to associate_original_type_to_packed_array.  When
	-fgnat-encodings=minimal, set original packed array type as so
	instead of as a parallel type to the implementation type.  In
	this case, also rename the implementation type to the name of
	the original array type.
	(gnat_to_gnu_entity): Update invocations to
	add_parallel_type_for_packed_array.  Tag ARRAY_TYPE nodes for
	packed arrays with the TYPE_PACKED flag.
	When -fgnat-encodings=minimal:
	  - strip ___XP suffixes in packed arrays' names;
	  - set the debug type for padding records around packed arrays
	    to the packed array;
	  - do not attach ___XUP types as parallel types of constrained
	    array types.
	* gcc-interface/misc.c (gnat_print_type): Update to handle
	orignal packed arrays.
	(gnat_get_debug_type): Update to reject packed arrays
	implementation types.
	(get_array_bit_stride): New.
	(gnat_get_array_descr_info): Add packed arrays handling.
	* gcc-interface/utils.c (maybe_pad_type): When
	-fgnat-encodings=minimal, set the name of the padding type to
	the one of the original packed type, if any.  Fix TYPE_DECL
	peeling around the name of the input type.

From-SVN: r231768

1 files changed, 11 insertions, 1 deletions

diff --git a/gcc/ada/gcc-interface/utils.c b/gcc/ada/gcc-interface/utils.c
index 1816f3a..be3565a 100644
--- a/gcc/ada/gcc-interface/utils.c
+++ b/gcc/ada/gcc-interface/utils.c
@@ -1281,7 +1281,17 @@ maybe_pad_type (tree type, tree size, unsigned int align,
   if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL)
     SET_TYPE_DEBUG_TYPE (record, type);
 
-  if (Present (gnat_entity))
+  /* ??? Kludge: padding types around packed array implementation types will be
+     considered as root types in the array descriptor language hook (see
+     gnat_get_array_descr_info). Give them the original packed array type
+     name so that the one coming from sources appears in the debugging
+     information.  */
+  if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL
+      && TYPE_IMPLEMENTS_PACKED_ARRAY_P (type)
+      && TYPE_ORIGINAL_PACKED_ARRAY (type) != NULL_TREE)
+    TYPE_NAME (record)
+      = TYPE_NAME (TYPE_ORIGINAL_PACKED_ARRAY (type));
+  else if (Present (gnat_entity))
     TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD");
 
   TYPE_ALIGN (record) = align ? align : orig_align;