Introduce register_operation

This adds class register_operation, which implements OP_REGISTER.

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

	* expop.h (class register_operation): New.
	* eval.c (eval_op_register): No longer static.
	* ax-gdb.c (register_operation::do_generate_ax): New method.

1 files changed, 30 insertions, 0 deletions

diff --git a/gdb/expop.h b/gdb/expop.h
index 73b66bf..a0e0030 100644
--- a/gdb/expop.h
+++ b/gdb/expop.h
@@ -58,6 +58,9 @@ extern struct value *eval_op_func_static_var (struct type *expect_type,
 					      struct expression *exp,
 					      enum noside noside,
 					      value *func, const char *var);
+extern struct value *eval_op_register (struct type *expect_type,
+				       struct expression *exp,
+				       enum noside noside, const char *name);
 
 namespace expr
 {
@@ -597,6 +600,33 @@ public:
   { return OP_LAST; }
 };
 
+class register_operation
+  : public tuple_holding_operation<std::string>
+{
+public:
+
+  using tuple_holding_operation::tuple_holding_operation;
+
+  value *evaluate (struct type *expect_type,
+		   struct expression *exp,
+		   enum noside noside) override
+  {
+    return eval_op_register (expect_type, exp, noside,
+			     std::get<0> (m_storage).c_str ());
+  }
+
+  enum exp_opcode opcode () const override
+  { return OP_REGISTER; }
+
+protected:
+
+  void do_generate_ax (struct expression *exp,
+		       struct agent_expr *ax,
+		       struct axs_value *value,
+		       struct type *cast_type)
+    override;
+};
+
 } /* namespace expr */
 
 #endif /* EXPOP_H */