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.

Modules/flmodule.c

@@ -435,8 +435,8 @@ generic_repr(g)
 	genericobject *g;
 {
 	char buf[100];
-	sprintf(buf, "<FORMS_object at %lx, objclass=%d>",
-		(long)g, g->ob_generic->objclass);
+	sprintf(buf, "<FORMS_object at %p, objclass=%d>",
+		g, g->ob_generic->objclass);
 	return PyString_FromString(buf);
 }
 
@@ -1906,8 +1906,8 @@ form_repr(f)
 	formobject *f;
 {
 	char buf[100];
-	sprintf(buf, "<FORMS_form at %lx, window=%ld>",
-		(long)f, f->ob_form->window);
+	sprintf(buf, "<FORMS_form at %p, window=%ld>",
+		f, f->ob_form->window);
 	return PyString_FromString(buf);
 }