Introduce ada_string_operation

This adds class ada_string_operation, which implements string
constants for Ada.

gdb/ChangeLog
2021-03-08  Tom Tromey  <tom@tromey.com>

	* ada-lang.c (ada_string_operation::evaluate): New method.
	* ada-exp.h (class ada_string_operation): New.

1 files changed, 13 insertions, 0 deletions

diff --git a/gdb/ada-exp.h b/gdb/ada-exp.h
index 3f780dc9ff4..88ed0c53b46 100644
--- a/gdb/ada-exp.h
+++ b/gdb/ada-exp.h
@@ -42,6 +42,19 @@ public:
   { return std::get<0> (m_storage)->opcode (); }
 };
 
+/* An Ada string constant.  */
+class ada_string_operation
+  : public string_operation
+{
+public:
+
+  using string_operation::string_operation;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override;
+};
+
 } /* namespace expr */
 
 #endif /* ADA_EXP_H */