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digitalmars.D.bugs - [Issue 1079] New: gdb on linux: Dwarf Error: Cannot find DIE at 0xb705 referenced from DIE at 0x250

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           Summary: gdb on linux: Dwarf Error: Cannot find DIE at 0xb705
                    referenced from DIE at 0x250
           Product: D
           Version: 1.009
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: someanon yahoo.com


previously I can use gdb to debug binary generated by dmd; but now (1.009) it
reports:

Dwarf Error: Cannot find DIE at 0xb705 referenced from DIE at 0x250

when I want to set a bp; or the program seg faults.

GNU gdb 6.4-debian


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------- Comment #1 from thomas-dloop kuehne.cn  2007-04-04 15:36 -------
Can you please provide some sample code where this happens?


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------- Comment #2 from hhasemann web.de  2007-06-25 10:10 -------
The issue is still present on 1.017 but here only in a very large program.
Im working on a minimal example.


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------- Comment #3 from onlystupidspamhere yahoo.se  2007-07-03 12:30 -------
(In reply to comment #1)
 Can you please provide some sample code where this happens?
 

Here's a sample (die.d) that used to work some time ago: void main() { Object foo = null; auto b = foo.toUtf8; } You need dmd 1.0xx (1.016 - 1.018 at least cause this) + tango (I'm using the svn version). You also need to use -g switch. $ dmd -g die.d gcc die.o -o die -g -m32 -Xlinker -L/home/jm/d/dsss/lib -lphobos -lpthread -lm $ gdb die GNU gdb 6.6 Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i686-pc-linux-gnu"... Using host libthread_db library "/lib/libthread_db.so.1". (gdb) run Starting program: /home/jm/tmp/die [Thread debugging using libthread_db enabled] [New Thread -1210349888 (LWP 4919)] Die: DW_TAG_<unknown> (abbrev = 6, offset = 88) has children: FALSE attributes: DW_AT_byte_size (DW_FORM_data1) constant: 8 DW_AT_type (DW_FORM_ref4) constant ref: 80 (adjusted) Dwarf Error: Cannot find type of die [in module /home/jm/tmp/die] (gdb) --
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------- Comment #4 from thomas-dloop kuehne.cn  2007-07-23 14:56 -------
Added to DStress as
http://dstress.kuehne.cn/norun/d/debug_info_13_A.d

(In this case using -gc instead of -g causes the propper gdb behaviour)


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------- Comment #5 from onlystupidspamhere yahoo.se  2007-08-07 09:54 -------
(In reply to comment #4)
 Added to DStress as
 http://dstress.kuehne.cn/norun/d/debug_info_13_A.d
 
 (In this case using -gc instead of -g causes the proper gdb behaviour)

This example triggers the bug with dmd 1.011+ - at least dmd 1.010, 1.009, 1.001 seemed to work fine. GDB version, other compiler flags, runtime lib version (I tried libphobos.a 1.011 with dmd 1.010 too) didn't have any effect. --
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deewiant gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |regression




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------- Comment #6 from onlystupidspamhere yahoo.se  2007-08-07 09:58 -------
Created an attachment (id=168)
 --> (http://d.puremagic.com/issues/attachment.cgi?id=168&action=view)
objdump -W binary diff

I'm not sure how much this helps, but these are the differences I found in the
debugging info between dmd 1.010 and dmd 1.011 generated binaries. The runtime
lib is phobos from dmd 1.011 in both binaries and there was no differences in
the executable code.

Hopefully this gets fixed soon - people need to debug on Linux too.


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braddr puremagic.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX




------- Comment #7 from braddr puremagic.com  2007-10-28 04:41 -------
The change in 1.011 that introduced this was intentional:

Extended Dwarf  symbolic debug output with DW_TAG_darray_type,
DW_TAG_aarray_type, and DW_TAG_delegate types.

If you don't use a D aware debugger, then you need to compile with -gc to
restrict the dwarf debug output.  The issue is on the gdb side in that it
doesn't support these DWARF extensions and in fact throws its hands up more
spectacularly than it needs to (it could continue past them while still
emitting the 'I dont understand' message.

So, this falls into the 'not a bug' category.  The work around is to use '-gc'
rather than just '-g'.  The more ideal fix is for someone to get all cozy with
gdb to teach it about the new debug info.


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stephan kochen.nl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |stephan kochen.nl
             Status|RESOLVED                    |REOPENED
         Resolution|WONTFIX                     |




------- Comment #8 from stephan kochen.nl  2007-12-27 17:28 -------
I'm reopening this, because these seem to be two separate issues. The original
problem still applies.

I've been working on an updated patch for GDB 6.7, based on the work available
at dsource.org [1]. In addition to the demangler, there's also stubs for the
DWARF extensions DMD uses. The simple example Jari-Matti (comment #3) wrote
debugs just fine now.

However, my larger project still fails with a "Cannot find DIE" error. The
original reporter didn't provide a lot of information. But getting a stacktrace
from GDB itself where it reports this error in my project, shows the problem to
be lying in:

DW_TAG_compilation_unit -> DW_TAG_subroutine_type -> DW_TAG_formal_parameter [
DW_AT_type ]

The reference in the type attribute isn't completely wild, it points within the
.debug_info, but it's still invalid. The dwarfdump [2] utility also trips on
this, so I'm again suspecting a problem in DMD.

I'm not sure what kind of construct in D generates this kind of output. The D
module triggering it contains just 3 classes. I was unable to create a small
test case.

[1] gdb-patches project: http://www.dsource.org/projects/gdb-patches
[2] libdwarf and dwarfdump: http://reality.sgiweb.org/davea/dwarf.html


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------- Comment #9 from stephan kochen.nl  2007-12-28 06:16 -------
I looked at the problem again this morning, and it looks like it's triggered by
delegate parameters. This is the smallest testcase I could come up with:

void problem(void delegate(Object) dg) { dg(null); }
void main() {
    problem(delegate void(Object o) {
        auto s = o.toString();
    });
}

There's an intentional crasher again, so simply compiling and running this in
GDB should trigger the bug immediately. I tested this with DMD 1.024, Tango
0.99.4 and the GDB 6.7.1 that is in Ubuntu Hardy right now.


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------- Comment #10 from someanon yahoo.com  2008-02-20 22:44 -------
Also have this problem with v2.011 on Linux.

when setting breakpoint:

without -gc:

Die: DW_TAG_<unknown> (abbrev = 21, offset = 3690)
        has children: FALSE
        attributes:
                DW_AT_byte_size (DW_FORM_data1) constant: 8
                DW_AT_containing_type (DW_FORM_ref4) constant ref: 1553
(adjusted)
                DW_AT_type (DW_FORM_ref4) constant ref: 3674 (adjusted)
Dwarf Error: Cannot find type of die 


with -gc:

Dwarf Error: Cannot find DIE at 0x1369b7 referenced from DIE at 0x19b [in
module


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------- Comment #11 from someanon yahoo.com  2008-02-20 22:46 -------
BTW, using http://ftp.gnu.org/gnu/gdb/gdb-6.5.tar.bz2
with http://www.dsource.org/projects/gdb-patches
d-gdb6.5.patch


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Leandro Lucarella <llucax gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |llucax gmail.com
         Resolution|                            |FIXED
            Summary|gdb on linux: Dwarf Error:  |gdb: Dwarf Error: Cannot
                   |Cannot find DIE at 0xb705   |find DIE at 0xb705
                   |referenced from DIE at      |referenced from DIE at
                   |0x250                       |0x250


--- Comment #12 from Leandro Lucarella <llucax gmail.com> 2009-10-12 14:11:44
PDT ---
This seems to be working in DMD 1.049 and 2.034.

I'm trying to organize GDB-related bugs, so I will close this one. Please let
me know if I shouldn't be closing bugs and feel free to reopen it if still
having this problem.

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Leandro Lucarella <llucax gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
            Version|1.009                       |2.034
         Resolution|FIXED                       |


--- Comment #13 from Leandro Lucarella <llucax gmail.com> 2009-10-12 16:21:06
PDT ---
Seems to be still happening with DMD 2.034 (DMD 1.049 works fine). See bug 3368
for details.

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Leandro Lucarella <llucax gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |echochamber gmail.com


--- Comment #14 from Leandro Lucarella <llucax gmail.com> 2009-10-12 16:21:55
PDT ---
*** Issue 3368 has been marked as a duplicate of this issue. ***

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--- Comment #15 from Bernard Helyer <blood.of.life gmail.com> 2010-01-20
20:53:25 PST ---
This seems to have something to do with arrays (or manifests itself when they
are present):

  [test]$ cat nolist.d 
  void main()
  {
      int i = 0;

      i++;
      assert(i == 1);
      i++;
      assert(i == 2);
      i++;
      assert(i == 3);
  }

That debugs fine, while

[test]$ cat list.d 
void main()
{
    int[] i = new int[1];

    i[0]++;
    assert(i[0] == 1);
    i[0]++;
    assert(i[0] == 2);
    i[0]++;
    assert(i[0] == 3);
}


debugging these:

[test]$ dgdb -q nolist
(gdb) break _Dmain
Breakpoint 1 at 0x80490aa: file nolist.d, line 1.
(gdb) run
Starting program: /home/bernard/src/dmd2/src/test/nolist 
[Thread debugging using libthread_db enabled]
[New Thread 0xb75c46d0 (LWP 27012)]
[Switching to Thread 0xb75c46d0 (LWP 27012)]

Breakpoint 1, D main () at nolist.d:3
3        int i = 0;
Current language:  auto; currently d
(gdb) quit
The program is running.  Exit anyway? (y or n) y
[test]$ dgdb -q list
(gdb) break _Dmain
Die: DW_TAG_<unknown> (abbrev = 4, offset = 460)
    has children: FALSE
    attributes:
        DW_AT_byte_size (DW_FORM_data1) constant: 8
        DW_AT_type (DW_FORM_ref4) constant ref: 453 (adjusted)
Dwarf Error: Cannot find type of die [in module
/home/bernard/src/dmd2/src/test/list]
(gdb) quit
[test]$ gdb -q list
(gdb) break _Dmain
Die: DW_TAG_<unknown> (abbrev = 4, offset = 460)
    has children: FALSE
    attributes:
        DW_AT_byte_size (DW_FORM_data1) constant: 8
        DW_AT_type (DW_FORM_ref4) constant ref: 453 (adjusted)
Dwarf Error: Cannot find type of die [in module
/home/bernard/src/dmd2/src/test/list]




Where `dgdb` is a patch GDB 6.8 and `gdb` is the normal GDB that ships with
Jaunty. The `nolist` binary is debuggable with the stock GDB, too.

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--- Comment #16 from Bernard Helyer <blood.of.life gmail.com> 2010-01-20
20:55:48 PST ---
Oh! The above were simply compiled like so:

dmd -g list.d
dmd -g nolist.d

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--- Comment #17 from Bernard Helyer <blood.of.life gmail.com> 2010-01-20
21:17:42 PST ---
Compiling with `-gc` allows gdb to debug it (but not interact with AA or DAs,
of course). This is with a patched gdb, though. Perhaps the bug lies in the
patches? I have definitely had failures on larger projects with `-gc`, though,
so I suspect dmd still has problems with its DWARF output regardless.

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Robert Clipsham <robert octarineparrot.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |robert octarineparrot.com


--- Comment #18 from Robert Clipsham <robert octarineparrot.com> 2010-03-19
16:34:02 PDT ---
http://d.puremagic.com/issues/show_bug.cgi?id=3987 Is related to this bug, if
not a duplicate. I'd also like to note that all the DW_TAG_<unknown> errors
when using -g rather than -gc are non-bugs, as that is expected until gdb
supports D's extensions to DWARF. If you get them when using -gc it is a dmd
issue.

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--- Comment #19 from Robert Clipsham <robert octarineparrot.com> 2010-03-29
15:43:36 PDT ---
Could people having this issue when using -gc try the patch for bug #3987,
which seems to fix a lot of issues with gdb. If you are only getting the
problem with -g, it is not a bug, you should use -gc until gdb supports the D
extensions to dwarf. If it doesn't fix it for you and you can provide a test
case, I might be able to fix that issue too.

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Ellery Newcomer <ellery-newcomer utulsa.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ellery-newcomer utulsa.edu


--- Comment #20 from Ellery Newcomer <ellery-newcomer utulsa.edu> 2010-03-29
16:38:58 PDT ---
(In reply to comment #19)
 Could people having this issue when using -gc try the patch for bug #3987,
 which seems to fix a lot of issues with gdb. If you are only getting the
 problem with -g, it is not a bug, you should use -gc until gdb supports the D
 extensions to dwarf. If it doesn't fix it for you and you can provide a test
 case, I might be able to fix that issue too.

I'm getting a Dwarf Error: Cannot find DIE at 0x0 referenced from DIE at 0x3dbf [in module /home/ellery/dxl/bin/dxl] If you feel like wading through my mongo example, here it is: http://personal.utulsa.edu/~ellery-newcomer/dxl.zip http://personal.utulsa.edu/~ellery-newcomer/dmdz.d http://personal.utulsa.edu/~ellery-newcomer/test1.xls build dmdz, then use it to build dxl.zip, then run dxl/bin/dxl test1.xls out.xls Oh, and you need to checkout dmd v1 from repo, as dxl.zip requires changeset 420 to compile. That or fiddle with dxl/read/biff/BOFRecord.d; I think there's only one line of code that needs to be messed with. There, I didn't make it too easy for you, did I? -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
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--- Comment #21 from Robert Clipsham <robert octarineparrot.com> 2010-03-29
16:44:08 PDT ---
I'm working on another patch now, another project had a similar issue, which is
fixed with my new (incomplete) patch. I'll let you know when I've uploaded it.

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Robert Clipsham <robert octarineparrot.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch
           See Also|                            |http://d.puremagic.com/issu
                   |                            |es/show_bug.cgi?id=3987


--- Comment #22 from Robert Clipsham <robert octarineparrot.com> 2010-04-01
13:27:23 BST ---
Please try the new patch in bug #3987. This fixes debug info for QtD and
Bernard Helyer's cases. I don't have a copy of dmd1 set up currently, so if you
could try your test case for me that'd be good :) If there are still issues
when compiling with -gc after applying the above patch let me know.

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--- Comment #23 from Ellery Newcomer <ellery-newcomer utulsa.edu> 2010-04-01
06:52:19 PDT ---
(In reply to comment #22)
 Please try the new patch in bug #3987. This fixes debug info for QtD and
 Bernard Helyer's cases. I don't have a copy of dmd1 set up currently, so if you
 could try your test case for me that'd be good :) If there are still issues
 when compiling with -gc after applying the above patch let me know.

I'm still getting the error message. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
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--- Comment #24 from Robert Clipsham <robert octarineparrot.com> 2010-04-01
15:39:56 BST ---
Your app causes a different bug to appear, I've reported it as bug #4037, I'll
see if I can create a patch for it later today, it should be far simpler to fix
than the last one.

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Robert Clipsham <robert octarineparrot.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |http://d.puremagic.com/issu
                   |                            |es/show_bug.cgi?id=4038


--- Comment #25 from Robert Clipsham <robert octarineparrot.com> 2010-04-01
20:50:39 BST ---
With the patches from bugs #3987, #4037 and #4308 applied, I can't reproduce
your errors any more Ellery, could you please confirm these patches fix the
issue for you? If it does I propose we close this issue and report any future
issues as new bugs.

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--- Comment #26 from Ellery Newcomer <ellery-newcomer utulsa.edu> 2010-04-01
17:52:43 PDT ---
(In reply to comment #25)
 With the patches from bugs #3987, #4037 and #4308 applied, I can't reproduce
 your errors any more Ellery, could you please confirm these patches fix the
 issue for you? If it does I propose we close this issue and report any future
 issues as new bugs.

erk.. dos2unix dwarf.c.diff but yeah, it looks like it fixes it. Great job! -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
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Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |clugdbug yahoo.com.au
         Resolution|                            |FIXED


--- Comment #27 from Don <clugdbug yahoo.com.au> 2010-04-22 06:36:58 PDT ---
Closing this bug as fixed, on the basis of that last comment. Report any new
issues as new bugs.

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