Reimplement array concatenation for Ada and D

This started as a patch to implement string concatenation for Ada.
However, while working on this, I looked at how this code could
possibly be called.  It turns out there are only two users of
concat_operation: Ada and D.  So, in addition to implementing this for
Ada, this patch rewrites value_concat, removing the odd "concatenate
or repeat" semantics, which were completely unused.  As Ada and D both
seem to represent strings using TYPE_CODE_ARRAY, this removes the
TYPE_CODE_STRING code from there as well.

1 files changed, 15 insertions, 0 deletions

diff --git a/gdb/ada-exp.h b/gdb/ada-exp.h
index 765f0dc..44ca254 100644
--- a/gdb/ada-exp.h
+++ b/gdb/ada-exp.h
@@ -769,6 +769,21 @@ public:
 			bool parse_completion,
 			innermost_block_tracker *tracker,
 			struct type *context_type) override;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override;
+};
+
+class ada_concat_operation : public concat_operation
+{
+public:
+
+  using concat_operation::concat_operation;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override;
 };
 
 } /* namespace expr */