Use bitpos and type to lookup a gdb.Field object when its name is 'None'.

	PR python/15464
	PR python/16113
	* valops.c (value_struct_elt_bitpos): New function
	* py-type.c (convert_field): Set 'name' attribute of a gdb.Field
	object to 'None' if the field name is an empty string ("").
	* python/py-value.c (valpy_getitem): Use 'bitpos' and 'type'
	attribute to look for a field when 'name' is 'None'.
	(get_field_type): New function

	testsuite/
	* gdb.python/py-type.c: Enhance test case.
	* gdb.python/py-value-cc.cc: Likewise
	* gdb.python/py-type.exp: Add new tests.
	* gdb.python/py-value-cc.exp: Likewise

1 files changed, 23 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.python/py-value-cc.cc b/gdb/testsuite/gdb.python/py-value-cc.cc
index 59f1dec..ace957a 100644
--- a/gdb/testsuite/gdb.python/py-value-cc.cc
+++ b/gdb/testsuite/gdb.python/py-value-cc.cc
@@ -30,8 +30,21 @@ class B : public A {
   char a;
 };
 
+struct X
+{
+  union { int x; char y; };
+  union { int a; char b; };
+};
+
+union UU
+{
+  union { int x; char y; };
+  union { int a; char b; };
+};
+
 typedef B Btd;
 typedef int *int_ptr;
+typedef X Xtd;
 
 int
 func (const A &a)
@@ -57,6 +70,16 @@ func (const A &a)
   U u;
   u.a = 99;
 
+  X x;
+  x.x = 101;
+  x.a = 102;
+
+  UU uu;
+  uu.x = 1000;
+
+  X *x_ptr = &x;
+  Xtd *xtd = &x;
+
   return 0; /* Break here.  */
 }