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Re: question about method naming
- From: Daniel Jacobowitz <drow at mvista dot com>
- To: Gdb List <gdb at sources dot redhat dot com>
- Date: Mon, 6 May 2002 15:33:56 -0400
- Subject: Re: question about method naming
- References: <87u1pl6u33.fsf@creche.redhat.com>
On Mon, May 06, 2002 at 11:53:52AM -0600, Tom Tromey wrote:
> I compiled the appended code with `gcj -g'. I'm using the trunk cvs
> gcj. Then I ran gdb on the program.
>
> If I type:
>
> b x.main
>
> gdb tells me that there is no such method.
Are you working on a very current gcj? I.E. one that defaults to
DWARF-2 output? I observe the same thing in 3.0.4 with -gdwarf-2, but
not with -gstabs+.
In this version, the stabs debug info claims that 'class x' has a
member function 'main'. In DWARF-2 it claims that 'class x' has a
member function 'x.main(java.lang.String[])'. If this is still the
case in your compiler (check readelf -w output, search for a
DW_TAG_subprogram whose name contains main) then I believe it is
a gcj bug.
<2><16d>: Abbrev Number: 4 (DW_TAG_subprogram)
DW_AT_sibling : <1c4>
DW_AT_external : 1
DW_AT_name : x.main(java.lang.String[])
DW_AT_decl_file : 1
DW_AT_decl_line : 458756
DW_AT_MIPS_linkage_name: _ZN1x4mainEP6JArrayIPN4java4lang6StringEE
DW_AT_declaration : 1
Also amusing:
<2><1c4>: Abbrev Number: 6 (DW_TAG_subprogram)
DW_AT_external : 1
DW_AT_name : ()
DW_AT_MIPS_linkage_name: _ZN1xC1Ev
DW_AT_artificial : 1
DW_AT_declaration : 1
The constructor's name is obviously wrong...
>
> I tracked the problem down to linespec.c:find_methods().
>
> Here we end up in the loop, and method_name for the 0th method is:
>
> (gdb) p method_name
> $27 = 0x83e9a52 "x.main(java.lang.String[])"
>
> So of course we fail to match this against "main".
>
> Is this a gdb bug or a gcj bug? Or just a disagreement?
>
> I'm guessing that method_name should not be fully qualified.
> Is that correct?
I believe so.
>
> Tom
>
> public class x
> {
> public static void main (String[] args)
> {
> char c = args[0].charAt(0);
> System.out.println(c);
> }
> }
>
--
Daniel Jacobowitz Carnegie Mellon University
MontaVista Software Debian GNU/Linux Developer