Implement write_async_safe for mi_console_file (PR 22299)

[deliverable/binutils-gdb.git] / gdb / gdbtypes.h

diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index e18ae6e54063d9014a2c444e604e3c629f456b48..552a2a2a164e9341516e897337b9f6de36a93305 100644 (file)
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -312,6 +312,14 @@ DEF_ENUM_FLAGS_TYPE (enum type_instance_flag_value, type_instance_flags);
 
 #define TYPE_FLAG_ENUM(t) (TYPE_MAIN_TYPE (t)->flag_flag_enum)
 
+/* * True if this type is a discriminated union type.  Only valid for
+   TYPE_CODE_UNION.  A discriminated union stores a reference to the
+   discriminant field along with the discriminator values in a dynamic
+   property.  */
+
+#define TYPE_FLAG_DISCRIMINATED_UNION(t) \
+  (TYPE_MAIN_TYPE (t)->flag_discriminated_union)
+
 /* * Constant type.  If this is set, the corresponding type has a
    const modifier.  */
 
@@ -381,6 +389,39 @@ DEF_ENUM_FLAGS_TYPE (enum type_instance_flag_value, type_instance_flags);
 #define TYPE_ADDRESS_CLASS_ALL(t) (TYPE_INSTANCE_FLAGS(t) \
                                   & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
 
+/* * Information needed for a discriminated union.  A discriminated
+   union is handled somewhat differently from an ordinary union.
+
+   One field is designated as the discriminant.  Only one other field
+   is active at a time; which one depends on the value of the
+   discriminant and the data in this structure.
+
+   Additionally, it is possible to have a univariant discriminated
+   union.  In this case, the union has just a single field, which is
+   assumed to be the only active variant -- in this case no
+   discriminant is provided.  */
+
+struct discriminant_info
+{
+  /* * The index of the discriminant field.  If -1, then this union
+     must have just a single field.  */
+
+  int discriminant_index;
+
+  /* * The index of the default branch of the union.  If -1, then
+     there is no default branch.  */
+
+  int default_index;
+
+  /* * The discriminant values corresponding to each branch.  This has
+     a number of entries equal to the number of fields in this union.
+     If discriminant_index is not -1, then that entry in this array is
+     not used.  If default_index is not -1, then that entry in this
+     array is not used.  */
+
+  ULONGEST discriminants[1];
+};
+
 enum dynamic_prop_kind
 {
   PROP_UNDEFINED, /* Not defined.  */
@@ -439,6 +480,9 @@ enum dynamic_prop_node_kind
 
   /* A property providing an array's byte stride.  */
   DYN_PROP_BYTE_STRIDE,
+
+  /* A property holding information about a discriminated union.  */
+  DYN_PROP_DISCRIMINATED,
 };
 
 /* * List for dynamic type attributes.  */
@@ -658,6 +702,13 @@ struct main_type
 
   unsigned int flag_flag_enum : 1;
 
+  /* * True if this type is a discriminated union type.  Only valid
+     for TYPE_CODE_UNION.  A discriminated union stores a reference to
+     the discriminant field along with the discriminator values in a
+     dynamic property.  */
+
+  unsigned int flag_discriminated_union : 1;
+
   /* * A discriminant telling us which field of the type_specific
      union is being used for this type, if any.  */