[PATCH v2 1/7] fortran: new wrapper class gfc_dummy_arg

[Mikael Morin via Fortran]

Introduce a new wrapper class gfc_dummy_arg that provides a common
interface to both dummy arguments of user-defined procedures (which
have type gfc_formal_arglist) and dummy arguments of intrinsic procedures
(which have type gfc_intrinsic_arg).

gcc/fortran/
        * gfortran.h (gfc_dummy_arg_kind, gfc_dummy_arg): New.
---
 gcc/fortran/gfortran.h | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)


diff --git a/gcc/fortran/gfortran.h b/gcc/fortran/gfortran.h
index 921aed93dc3..55ac4a80549 100644
--- a/gcc/fortran/gfortran.h
+++ b/gcc/fortran/gfortran.h
@@ -2169,11 +2169,29 @@ typedef struct gfc_intrinsic_arg
   gfc_actual_arglist *actual;
 
   struct gfc_intrinsic_arg *next;
-
 }
 gfc_intrinsic_arg;
 
 
+typedef enum {
+  GFC_UNDEFINED_DUMMY_ARG = 0,
+  GFC_INTRINSIC_DUMMY_ARG,
+  GFC_NON_INTRINSIC_DUMMY_ARG
+}
+gfc_dummy_arg_kind;
+
+/* dummy arg of either an intrinsic or a user-defined procedure.  */
+struct gfc_dummy_arg
+{
+  gfc_dummy_arg_kind kind;
+
+  union {
+    gfc_intrinsic_arg *intrinsic;
+    gfc_formal_arglist *non_intrinsic;
+  } u;
+};
+
+
 /* Specifies the various kinds of check functions used to verify the
    argument lists of intrinsic functions. fX with X an integer refer
    to check functions of intrinsics with X arguments. f1m is used for