Implement some Ada OP_ATR_ operations

This implements a few Ada OP_ATR_ operations.

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

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

3 files changed, 42 insertions, 0 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c414df1..ee37053 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2021-03-08  Tom Tromey  <tom@tromey.com>
 
+	* ada-lang.c (ada_unop_atr_operation::evaluate): New method.
+	* ada-exp.h (class ada_unop_atr_operation): New.
+
+2021-03-08  Tom Tromey  <tom@tromey.com>
+
 	* ada-lang.c (ada_binop_in_bounds): No longer static.
 	* ada-exp.h (class ada_binop_in_bounds_operation): New.
 
diff --git a/gdb/ada-exp.h b/gdb/ada-exp.h
index 4c30734..e92ae46 100644
--- a/gdb/ada-exp.h
+++ b/gdb/ada-exp.h
@@ -267,6 +267,22 @@ public:
   { return BINOP_IN_BOUNDS; }
 };
 
+/* Implement several unary Ada OP_ATR_* operations.  */
+class ada_unop_atr_operation
+  : public maybe_constant_operation<operation_up, enum exp_opcode, int>
+{
+public:
+
+  using maybe_constant_operation::maybe_constant_operation;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override;
+
+  enum exp_opcode opcode () const override
+  { return std::get<1> (m_storage); }
+};
+
 } /* namespace expr */
 
 #endif /* ADA_EXP_H */
diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 2424167..9103ece 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -10532,6 +10532,27 @@ ada_binop_addsub_operation::evaluate (struct type *expect_type,
   return arg1;
 }
 
+value *
+ada_unop_atr_operation::evaluate (struct type *expect_type,
+				  struct expression *exp,
+				  enum noside noside)
+{
+  struct type *type_arg = nullptr;
+  value *val = nullptr;
+
+  if (std::get<0> (m_storage)->opcode () == OP_TYPE)
+    {
+      value *tem = std::get<0> (m_storage)->evaluate (nullptr, exp,
+						      EVAL_AVOID_SIDE_EFFECTS);
+      type_arg = value_type (tem);
+    }
+  else
+    val = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
+
+  return ada_unop_atr (exp, noside, std::get<1> (m_storage),
+		       val, type_arg, std::get<2> (m_storage));
+}
+
 }
 
 /* Implement the evaluate_exp routine in the exp_descriptor structure