Trent Mick <trentm@activestate.com>:

The common technique for printing out a pointer has been to cast to a long
and use the "%lx" printf modifier. This is incorrect on Win64 where casting
to a long truncates the pointer. The "%p" formatter should be used instead.

The problem as stated by Tim:
> Unfortunately, the C committee refused to define what %p conversion "looks
> like" -- they explicitly allowed it to be implementation-defined. Older
> versions of Microsoft C even stuck a colon in the middle of the address (in
> the days of segment+offset addressing)!

The result is that the hex value of a pointer will maybe/maybe not have a 0x
prepended to it.


Notes on the patch:

There are two main classes of changes:
- in the various repr() functions that print out pointers
- debugging printf's in the various thread_*.h files (these are why the
patch is large)


Closes SourceForge patch #100505.

1 files changed, 2 insertions, 2 deletions

diff --git a/Objects/intobject.c b/Objects/intobject.c
index 2e8939e..d182b30 100644
--- a/Objects/intobject.c
+++ b/Objects/intobject.c
@@ -957,8 +957,8 @@ PyInt_Fini()
 			     i++, p++) {
 				if (PyInt_Check(p) && p->ob_refcnt != 0)
 					fprintf(stderr,
-				"#   <int at %lx, refcnt=%d, val=%ld>\n",
-					  (long)p, p->ob_refcnt, p->ob_ival);
+				"#   <int at %p, refcnt=%d, val=%ld>\n",
+						p, p->ob_refcnt, p->ob_ival);
 			}
 			list = list->next;
 		}