debugging dwarf2 info

[Daniel Jacobowitz]

On Mon, Jan 14, 2002 at 02:51:40PM -0800, Per Bothner wrote:
> Two questions:
> 
> (1) Can people recommend a tool for dumping in human-readable form
> the dwarf2 information in an object file?  Lacking that, I seem to
> remember that there used an option to heavily annotate the
> aseembley code, but I don't see that any more.
> 
> Any other tools or information (beyond the dwarf 2.1 draft spec
> listed is "Readings") that would be useful if I want to understand
> what is going on wrt gcj debugging?

Readelf -w decodes it fairly well.  Also, -dA annotation is reasonably
good - that was the flag you were thinking of, probably.

> (2) When I run a gcj-compiled Java program (built using Makefile
> rules etc that used to work) I get these error messages:
> 
> BFD: Dwarf Error: Invalid or unhandled FORM value: 14.
> BFD: Dwarf Error: Invalid or unhandled FORM value: 14.
> BFD: Dwarf Error: Invalid or unhandled FORM value: 14.
> BFD: Dwarf Error: Invalid or unhandled FORM value: 14.
> BFD: Dwarf Error: Could not find abbrev number 549.
> BFD: Dwarf Error: Invalid or unhandled FORM value: 14.
> kawa.lang.GenericError: read error reading file:
> gnu.text.SyntaxException
>    at 0x40245880: java.lang.Throwable.Throwable(java.lang.String) 
> (/home/bothner/GNU/install-gcc/lib/libgcj.so.2)
> ...
> 
> Does this look familiar to anyone?

That's DW_FORM_strp.  Support was added to BFD for that 'relatively'
recently.  Perhaps a 3.0-era BFD or libgcj and 3.1-era gcj?

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