Re: C++ debugging progress

[Daniel Jacobowitz <drow at mvista dot com>]

On Wed, Nov 28, 2001 at 01:36:28PM -0500, Daniel Berlin wrote:
> > Dwarf2 first:
> >  <1><115>: Abbrev Number: 15 (DW_TAG_structure_type)
> >      DW_AT_sibling     : <1c2>
> >      DW_AT_name        : Bottom
> >      DW_AT_byte_size   : 24
> >      DW_AT_decl_file   : 1
> >      DW_AT_decl_line   : 4
> >      DW_AT_containing_type: <22e>
> >  <2><128>: Abbrev Number: 16 (DW_TAG_inheritance)
> >      DW_AT_type        : <22e>
> >      DW_AT_data_member_location: 2 byte block: 23 0 (DW_OP_plus_uconst: 0; )
> >      DW_AT_accessibility: 1     (public)
> >  <2><131>: Abbrev Number: 16 (DW_TAG_inheritance)
> >      DW_AT_type        : <2df>
> >      DW_AT_data_member_location: 2 byte block: 23 8 (DW_OP_plus_uconst: 8; )
> >      DW_AT_accessibility: 1     (public)
> >  <2><13a>: Abbrev Number: 3 (DW_TAG_member)
> >      DW_AT_name        : bbb
> >      DW_AT_decl_file   : 1
> >      DW_AT_decl_line   : 4
> >      DW_AT_type        : <cd>
> >      DW_AT_data_member_location: 2 byte block: 23 10 (DW_OP_plus_uconst: 16; )
> >
> > Do you see it?  I don't, and I'm pretty sure it's not there.
> 
> Umm, look at type 2df and 22e.
> I'm going to bet money xxx is there.

You owe me some money.

Both 22e and 2df are marked as inheriting from Base, which is <56> (I
included 22e in the original message).  They contain:

 <2><23f>: Abbrev Number: 22 (DW_TAG_inheritance)
     DW_AT_type        : <56>
     DW_AT_data_member_location: 2 byte block: 23 8 (DW_OP_plus_uconst: 8; )
     DW_AT_virtuality  : 1      (virtual)
     DW_AT_accessibility: 1     (public)

That tells me where xxx would be, inside the <56> at offset +8, if my
object was of type 2df or 22e.  It isn't, it's of type 115.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer