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.

Objects/funcobject.c

@@ -202,11 +202,11 @@ func_repr(op)
 {
 	char buf[140];
 	if (op->func_name == Py_None)
-		sprintf(buf, "<anonymous function at %lx>", (long)op);
+		sprintf(buf, "<anonymous function at %p>", op);
 	else
-		sprintf(buf, "<function %.100s at %lx>",
+		sprintf(buf, "<function %.100s at %p>",
 			PyString_AsString(op->func_name),
-			(long)op);
+			op);
 	return PyString_FromString(buf);
 }