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.
diff --git a/Objects/methodobject.c b/Objects/methodobject.c
index 580bb2f..ec98de4 100644
--- a/Objects/methodobject.c
+++ b/Objects/methodobject.c
@@ -148,9 +148,9 @@
sprintf(buf, "<built-in function %.80s>", m->m_ml->ml_name);
else
sprintf(buf,
- "<built-in method %.80s of %.80s object at %lx>",
+ "<built-in method %.80s of %.80s object at %p>",
m->m_ml->ml_name, m->m_self->ob_type->tp_name,
- (long)m->m_self);
+ m->m_self);
return PyString_FromString(buf);
}