poly_int: expand_debug_expr

This patch makes expand_debug_expr track polynomial memory offsets.
It simplifies the handling of the case in which the reference is not
to the first byte of the base, which seemed non-trivial enough to
make it worth splitting out as a separate patch.

2017-12-20  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* tree.h (get_inner_reference): Add a version that returns the
	offset and size as poly_int64_pods rather than HOST_WIDE_INTs.
	* cfgexpand.c (expand_debug_expr): Track polynomial offsets.  Simply
	the case in which bitpos is not associated with the first byte.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r255892

1 files changed, 11 insertions, 0 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index a7b8c2f..db87321 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -5638,6 +5638,17 @@ extern bool complete_ctor_at_level_p (const_tree, HOST_WIDE_INT, const_tree);
    the access position and size.  */
 extern tree get_inner_reference (tree, HOST_WIDE_INT *, HOST_WIDE_INT *,
 				 tree *, machine_mode *, int *, int *, int *);
+/* Temporary.  */
+inline tree
+get_inner_reference (tree exp, poly_int64_pod *pbitsize,
+		     poly_int64_pod *pbitpos, tree *poffset,
+		     machine_mode *pmode, int *punsignedp,
+		     int *preversep, int *pvolatilep)
+{
+  return get_inner_reference (exp, &pbitsize->coeffs[0], &pbitpos->coeffs[0],
+			      poffset, pmode, punsignedp, preversep,
+			      pvolatilep);
+}
 
 extern tree build_personality_function (const char *);