Fix infinite recursion when printing static member with typedef

The original problem was fixed (see related PR 22242). But using a typedef
as the declared type for a static member variable, as commented in this PR,
is still causing gdb to get into infinite loop when printing the static
member's value. This problem can be reproduced as follows:

% cat t.cc
class A {
    typedef A type;
public:
    bool operator==(const type& other) { return true; }

    static const type INSTANCE;
};

const A A::INSTANCE;

int main() {
    A a;
    if (a == A::INSTANCE) {
        return -1;
    }
    return 0;
}
% g++ -g t.cc
% gdb -ex "start" -ex "p a" a.out

The fix is rather trivial - in cp_print_static_field(), should call
check_typedef() to get the static member's real type and use it to
check whether it's a struct or an array.

As Simon suggested, I've added a new test case to the testsuite
and am passing the original type, not the real type, as argument
to both cp_print_value_fields() and val_print().

Re-tested on both aarch64-linux-gnu and amd64-linux-gnu. No regressions.

1 files changed, 3 insertions, 3 deletions

diff --git a/gdb/cp-valprint.c b/gdb/cp-valprint.c
index 486653f..e019a60 100644
--- a/gdb/cp-valprint.c
+++ b/gdb/cp-valprint.c
@@ -633,7 +633,8 @@ cp_print_static_field (struct type *type,
       return;
     }
 
-  if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
+  struct type *real_type = check_typedef (type);
+  if (TYPE_CODE (real_type) == TYPE_CODE_STRUCT)
     {
       CORE_ADDR *first_dont_print;
       CORE_ADDR addr;
@@ -658,7 +659,6 @@ cp_print_static_field (struct type *type,
       addr = value_address (val);
       obstack_grow (&dont_print_statmem_obstack, (char *) &addr,
 		    sizeof (CORE_ADDR));
-      type = check_typedef (type);
       cp_print_value_fields (type, value_enclosing_type (val),
 			     value_embedded_offset (val), addr,
 			     stream, recurse, val,
@@ -666,7 +666,7 @@ cp_print_static_field (struct type *type,
       return;
     }
 
-  if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
+  if (TYPE_CODE (real_type) == TYPE_CODE_ARRAY)
     {
       struct type **first_dont_print;
       int i;