[PATCH v3 04/13] vla: enable sizeof operator for indirection

Sanimir Agovic
2013-12-04T14:21:13Z

This patch enables the sizeof operator for indirections:

1| void foo (size_t n) {
2| int vla[n];
3| int *vla_ptr = &vla;
4| }

(gdb) p sizeof(*vla_ptr)

yields N.

2013-10-18 Sanimir Agovic <sanimir.agovic@intel.com>
Keven Boell <keven.boell@intel.com>

* eval.c (evaluate_subexp_for_sizeof): Create a indirect value and
retrieve the dynamic type size.

Change-Id: I3dbe85ebbc87ca93115a1952316b6436f750a16d
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
gdb/eval.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/gdb/eval.c b/gdb/eval.c
index a81e789..b3e45ca 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -3027,6 +3027,8 @@ evaluate_subexp_for_sizeof (struct expression *exp, int *pos)
&& TYPE_CODE (type) != TYPE_CODE_ARRAY)
error (_("Attempt to take contents of a non-pointer value."));
type = check_typedef (TYPE_TARGET_TYPE (type));
+ if (is_dynamic_type (type))
+ type = value_type (value_ind (val));
return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));

case UNOP_MEMVAL:
--
1.8.3.1