From: Corinna Vinschen <vinschen@redhat.com>
To: gdb@sources.redhat.com
Subject: Problem with virtual function pointers
Date: Thu, 27 Mar 2003 14:24:00 -0000 [thread overview]
Message-ID: <20030327142412.GK23762@cygbert.vinschen.de> (raw)
Hi,
I'm just investigating a problem which XStormy16 gets in
gdb.c++/printmethod.exp:
print theA->virt^M
$1 = invalid pointer to member function^M
FAIL: gdb.c++/printmethod.exp: print virtual method.
It turned out that the error happens in xstormy16_pointer_to_address().
This function converts an address to a jump table entry into a pointer
to the actual function. To do this, it calls a conversion routine,
which is only called if the following condition applies:
enum type_code target = TYPE_CODE (TYPE_TARGET_TYPE (type));
if (target == TYPE_CODE_FUNC || target == TYPE_CODE_METHOD)
convert();
Surprisingly (at least for me) this fails for the above case. Looking
into type, I found that type is TYPE_CODE_PTR which is correct, but
target_type is TYPE_CODE_VOID! Sure, the above virtual method is of
type void but is that really ok? Shouldn't that be
type: TYPE_CODE_PTR
type->target_type: TYPE_CODE_METHOD
type->target_type->target_type: TYPE_CODE_VOID
?
Does somebody know why that happens? Is that just a bug in gdb? Or
could that be related to incorrect debug info from gcc?
Corinna
--
Corinna Vinschen
Cygwin Developer
Red Hat, Inc.
mailto:vinschen@redhat.com
next reply other threads:[~2003-03-27 14:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-27 14:24 Corinna Vinschen [this message]
2003-03-27 14:53 ` Daniel Jacobowitz
2003-03-27 15:20 ` Corinna Vinschen
2003-03-27 15:26 ` Daniel Jacobowitz
2003-03-27 16:18 ` Corinna Vinschen
2003-04-01 17:34 ` Corinna Vinschen
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