Split out eval_op_neg

This splits UNOP NEG into a new function for future use.

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

	* eval.c (eval_op_neg): New function.
	(evaluate_subexp_standard): Use it.

2 files changed, 24 insertions, 9 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 3379b9f..b27ed9c 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2021-03-08  Tom Tromey  <tom@tromey.com>
 
+	* eval.c (eval_op_neg): New function.
+	(evaluate_subexp_standard): Use it.
+
+2021-03-08  Tom Tromey  <tom@tromey.com>
+
 	* eval.c (eval_op_plus): New function.
 	(evaluate_subexp_standard): Use it.
 
diff --git a/gdb/eval.c b/gdb/eval.c
index 24c891d..5cc7b18 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -1769,6 +1769,24 @@ eval_op_plus (struct type *expect_type, struct expression *exp,
     }
 }
 
+/* A helper function for UNOP_NEG.  */
+
+static struct value *
+eval_op_neg (struct type *expect_type, struct expression *exp,
+	     enum noside noside, enum exp_opcode op,
+	     struct value *arg1)
+{
+  if (noside == EVAL_SKIP)
+    return eval_skip_value (exp);
+  if (unop_user_defined_p (op, arg1))
+    return value_x_unop (arg1, op, noside);
+  else
+    {
+      unop_promote (exp->language_defn, exp->gdbarch, &arg1);
+      return value_neg (arg1);
+    }
+}
+
 struct value *
 evaluate_subexp_standard (struct type *expect_type,
 			  struct expression *exp, int *pos,
@@ -2622,15 +2640,7 @@ evaluate_subexp_standard (struct type *expect_type,
       
     case UNOP_NEG:
       arg1 = evaluate_subexp (nullptr, exp, pos, noside);
-      if (noside == EVAL_SKIP)
-	return eval_skip_value (exp);
-      if (unop_user_defined_p (op, arg1))
-	return value_x_unop (arg1, op, noside);
-      else
-	{
-	  unop_promote (exp->language_defn, exp->gdbarch, &arg1);
-	  return value_neg (arg1);
-	}
+      return eval_op_neg (expect_type, exp, noside, op, arg1);
 
     case UNOP_COMPLEMENT:
       /* C++: check for and handle destructor names.  */