Introduce structop_member_operation and structop_mptr_operation

This adds class structop_member_operation and structop_mptr_operation,
which implement STRUCTOP_MEMBER and STRUCTOP_MPTR.

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

	* expop.h (class structop_member_operation)
	(class structop_mptr_operation): New.
	* eval.c (eval_op_member): No longer static.

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2021-03-08  Tom Tromey  <tom@tromey.com>
+
+	* expop.h (class structop_member_operation)
+	(class structop_mptr_operation): New.
+	* eval.c (eval_op_member): No longer static.
+
 2021-03-08  Tom Tromey  <tom@tromey.com>
 
 	* expop.h (class structop_ptr_operation): New.

gdb/eval.c

@@ -1417,7 +1417,7 @@ eval_op_structop_ptr (struct type *expect_type, struct expression *exp,
 
 /* A helper function for STRUCTOP_MEMBER.  */
 
-static struct value *
+struct value *
 eval_op_member (struct type *expect_type, struct expression *exp,
 		enum noside noside,
 		struct value *arg1, struct value *arg2)

gdb/expop.h

@@ -80,6 +80,10 @@ extern struct value *eval_op_structop_ptr (struct type *expect_type,
 					   enum noside noside,
 					   struct value *arg1,
 					   const char *string);
+extern struct value *eval_op_member (struct type *expect_type,
+				     struct expression *exp,
+				     enum noside noside,
+				     struct value *arg1, struct value *arg2);
 
 namespace expr
 {
@@ -887,6 +891,50 @@ protected:
   }
 };
 
+class structop_member_operation
+  : public tuple_holding_operation<operation_up, operation_up>
+{
+public:
+
+  using tuple_holding_operation::tuple_holding_operation;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override
+  {
+    value *lhs
+      = std::get<0> (m_storage)->evaluate_for_address (exp, noside);
+    value *rhs
+      = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
+    return eval_op_member (expect_type, exp, noside, lhs, rhs);
+  }
+
+  enum exp_opcode opcode () const override
+  { return STRUCTOP_MEMBER; }
+};
+
+class structop_mptr_operation
+  : public tuple_holding_operation<operation_up, operation_up>
+{
+public:
+
+  using tuple_holding_operation::tuple_holding_operation;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override
+  {
+    value *lhs
+      = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
+    value *rhs
+      = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
+    return eval_op_member (expect_type, exp, noside, lhs, rhs);
+  }
+
+  enum exp_opcode opcode () const override
+  { return STRUCTOP_MPTR; }
+};
+
 } /* namespace expr */
 
 #endif /* EXPOP_H */