Introduce scope_operation

This adds class scope_operation, an implementation of OP_SCOPE.

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

	* expop.h (class scope_operation): New.
	* eval.c (eval_op_scope): No longer static.
	(scope_operation::evaluate_for_address): New method.
	* ax-gdb.c (scope_operation::do_generate_ax): New method.

1 files changed, 13 insertions, 1 deletions

diff --git a/gdb/eval.c b/gdb/eval.c
index 8adbcef..452f088 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -1185,7 +1185,7 @@ is_integral_or_integral_reference (struct type *type)
 
 /* Helper function that implements the body of OP_SCOPE.  */
 
-static struct value *
+struct value *
 eval_op_scope (struct type *expect_type, struct expression *exp,
 	       enum noside noside,
 	       struct type *type, const char *string)
@@ -3289,6 +3289,18 @@ operation::evaluate_for_address (struct expression *exp, enum noside noside)
   return evaluate_subexp_for_address_base (exp, noside, val);
 }
 
+value *
+scope_operation::evaluate_for_address (struct expression *exp,
+				       enum noside noside)
+{
+  value *x = value_aggregate_elt (std::get<0> (m_storage),
+				  std::get<1> (m_storage).c_str (),
+				  NULL, 1, noside);
+  if (x == NULL)
+    error (_("There is no field named %s"), std::get<1> (m_storage).c_str ());
+  return x;
+}
+
 }
 
 /* Evaluate like `evaluate_subexp' except coercing arrays to pointers.