gdb: fix completion of anonymous struct members

Completing fields inside an anonymous struct does not work.  With:

    struct commit_counters_hot {
    	union {
    		struct {
    			long owner;
    		};
    		char padding[16];
    	};
    };

I get:

    (gdb) complete print cc_hot.
    print cc_hot.padding

After this patch, I get:

    (gdb) complete print cc_hot.
    print cc_hot.owner
    print cc_hot.padding

Update break1.c to include an anonymous struct.  The tests that complete
"z_field" inside gdb.base/completion.exp would start to fail without the
fix.

Change-Id: I46b65a95ad16b0825de58dfa241777fe57acc361
Reviewed-By: Keith Seitz <keiths@redhat.com>

2 files changed, 10 insertions, 3 deletions

diff --git a/gdb/eval.c b/gdb/eval.c
index 95d2532..19770ad 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -994,9 +994,10 @@ add_struct_fields (struct type *type, completion_list &output,
 		output.emplace_back (concat (prefix, type->field (i).name (),
 					     nullptr));
 	    }
-	  else if (type->field (i).type ()->code () == TYPE_CODE_UNION)
+	  else if (type->field (i).type ()->code () == TYPE_CODE_UNION
+		   || type->field (i).type ()->code () == TYPE_CODE_STRUCT)
 	    {
-	      /* Recurse into anonymous unions.  */
+	      /* Recurse into anonymous unions and structures.  */
 	      add_struct_fields (type->field (i).type (),
 				 output, fieldname, namelen, prefix);
 	    }
diff --git a/gdb/testsuite/gdb.base/break1.c b/gdb/testsuite/gdb.base/break1.c
index 110341c..26c4663 100644
--- a/gdb/testsuite/gdb.base/break1.c
+++ b/gdb/testsuite/gdb.base/break1.c
@@ -23,7 +23,13 @@ struct some_struct
 {
   int a_field;
   int b_field;
-  union { int z_field; };
+  union
+  {
+    struct
+    {
+      int z_field;
+    };
+  };
 };
 
 struct some_struct values[50];