[PATCH 5/5] Call ada_ensure_varsize_limit in indirection

[Tom Tromey <tromey@adacore.com>]

Internal testing revealed yet another Ada regression from the
expression rewrite.  In this case, indirection did not use the Ada
varsize limit.  The old code relied on the expression resolution
process to evaluate this subexpression with EVAL_AVOID_SIDE_EFFECTS in
order to get this error.  However, this isn't always done in the new
approach; so this patch introduces another call to
ada_ensure_varsize_limit in the appropriate spot.

As with the earlier patches, this path was not tested in-tree, so this
patch also updates a test.

gdb/ChangeLog
2021-03-10  Tom Tromey  <tromey@adacore.com>

	* ada-lang.c (ada_unop_ind_operation::evaluate): Call
	ada_ensure_varsize_limit.

gdb/testsuite/ChangeLog
2021-03-10  Tom Tromey  <tromey@adacore.com>

	* gdb.ada/varsize_limit.exp: Add new test.
	* gdb.ada/varsize_limit/vsizelim.adb: Update.
---
 gdb/ChangeLog                                    |  5 +++++
 gdb/ada-lang.c                                   |  5 +++++
 gdb/testsuite/ChangeLog                          |  5 +++++
 gdb/testsuite/gdb.ada/varsize_limit.exp          |  2 +-
 gdb/testsuite/gdb.ada/varsize_limit/vsizelim.adb | 14 ++++++++++++++
 5 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index f63891b2955..7c1a308edbb 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -10480,6 +10480,11 @@ ada_unop_ind_operation::evaluate (struct type *expect_type,
 			      (CORE_ADDR) value_as_address (arg1));
     }
 
+  struct type *target_type = (to_static_fixed_type
+			      (ada_aligned_type
+			       (ada_check_typedef (TYPE_TARGET_TYPE (type)))));
+  ada_ensure_varsize_limit (target_type);
+
   if (ada_is_array_descriptor_type (type))
     /* GDB allows dereferencing GNAT array descriptors.  */
     return ada_coerce_to_simple_array (arg1);
diff --git a/gdb/testsuite/gdb.ada/varsize_limit.exp b/gdb/testsuite/gdb.ada/varsize_limit.exp
index eebb5d05def..aca926a79ab 100644
--- a/gdb/testsuite/gdb.ada/varsize_limit.exp
+++ b/gdb/testsuite/gdb.ada/varsize_limit.exp
@@ -37,4 +37,4 @@ gdb_test "print small" " = \"1234567890\""
 
 gdb_test "print larger" "object size is larger than varsize-limit.*"
 
-
+gdb_test "print name.all" "object size is larger than varsize-limit.*"
diff --git a/gdb/testsuite/gdb.ada/varsize_limit/vsizelim.adb b/gdb/testsuite/gdb.ada/varsize_limit/vsizelim.adb
index 058994ce88a..3b19e722eb2 100644
--- a/gdb/testsuite/gdb.ada/varsize_limit/vsizelim.adb
+++ b/gdb/testsuite/gdb.ada/varsize_limit/vsizelim.adb
@@ -14,10 +14,24 @@
 --  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 with Pck; use Pck;
+with System;
+with Unchecked_Conversion;
+
 procedure VsizeLim is
    Small : String := Ident ("1234567890");
    Larger : String := Ident ("1234567890|1234567890|1234567890");
+
+   type String_Ptr is access all String;
+   type Big_String_Ptr is access all String (Positive);
+
+   function To_Ptr is
+     new Unchecked_Conversion (System.Address, Big_String_Ptr);
+
+   Name_Str : String_Ptr := new String'(Larger);
+   Name : Big_String_Ptr := To_Ptr (Name_Str.all'Address);
+
 begin
    Do_Nothing (Small'Address); -- STOP
    Do_Nothing (Larger'Address);
+   Do_Nothing (Name'Address);
 end VsizeLim;
-- 
2.26.2