[Bug debug/42278] New: incorrect dwarf data gcc-4.4.2

[Bug debug/42278] New: incorrect dwarf data gcc-4.4.2

[YLitvinenko at astana dot oilfield dot slb dot com]

I faced an error "ERROR: ctfconvert: die 37: base type without name"
when run ctfconvert on some object files which were produced by gcc-4.4.2

The error like this:
/opt/onbld/bin/i386/ctfconvert -g -l NDISWRAPPER example.o                    
ERROR: ctfconvert: die 37: base type without name

I prepared a small example file and compile it with command line
gcc -g -O2 -o example.o -c example.c and two versions of gcc - 4.4.2 and 3.4.3
Then I run dwarfdump example.o on files produced by 4.4.2 and by 3.4.3

$ cat example.c
#include <sys/types.h>

int main()
{
 return 0;
}

Below the file from dwarfdump that was produced by gcc 4.4.2
.debug_info

COMPILE_UNIT<header overall offset = 0>:
<0><   11>      DW_TAG_compile_unit
                DW_AT_producer              GNU C 4.4.2
                DW_AT_language              DW_LANG_C89
                DW_AT_name                  example.c
                DW_AT_comp_dir              /home/unix/Documents/bugs
                DW_AT_low_pc                0
                DW_AT_high_pc               0x3
                DW_AT_stmt_list             0

LOCAL_SYMBOLS:
<1><   37>      DW_TAG_base_type
                DW_AT_byte_size             4
                DW_AT_encoding              DW_ATE_unsigned
<1><   40>      DW_TAG_base_type
                DW_AT_byte_size             4
                DW_AT_encoding              DW_ATE_signed
                DW_AT_name                  long int
<1><   47>      DW_TAG_base_type
...


And here the file from gcc-3.4.3
.debug_info

COMPILE_UNIT<header overall offset = 0>:
<0><   11>      DW_TAG_compile_unit
                DW_AT_stmt_list             0
                DW_AT_high_pc               0x10
                DW_AT_low_pc                0
                DW_AT_producer              GNU C 3.4.3
(csl-sol210-3_4-20050802)
                DW_AT_language              DW_LANG_C89
                DW_AT_name                  example.c
                DW_AT_comp_dir              /home/unix/Documents/bugs

LOCAL_SYMBOLS:
<1><   37>      DW_TAG_base_type
                DW_AT_name                  unsigned int
                DW_AT_byte_size             4
                DW_AT_encoding              DW_ATE_unsigned
<1><   44>      DW_TAG_base_type
                DW_AT_name                  long int
                DW_AT_byte_size             4
                DW_AT_encoding              DW_ATE_signed
...


The DIE describing base type from 3.4.3 contains DW_AT_name.
<1><   37>      DW_TAG_base_type
                DW_AT_name                  unsigned int
                DW_AT_byte_size             4
                DW_AT_encoding              DW_ATE_unsigned

but the same DIE from 4.4.2 doesn't contain DW_AT_name
<1><   37>      DW_TAG_base_type
                DW_AT_byte_size             4
                DW_AT_encoding              DW_ATE_unsigned


-- 
           Summary: incorrect dwarf data gcc-4.4.2
           Product: gcc
           Version: 4.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: YLitvinenko at astana dot oilfield dot slb dot com
 GCC build triplet: i386-pc-solaris2.11
  GCC host triplet: i386-pc-solaris2.11
GCC target triplet: i386-pc-solaris2.11


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42278

[Bug debug/42278] [4.4, 4.5, 4.6 regression] incorrect dwarf data gcc-4.4.2

[ro at gcc dot gnu dot org]

------- Comment #1 from ro at gcc dot gnu dot org  2010-04-28 19:08 -------
Right: this is both a regression from 3.4 and in violation of the DWARF-3 spec,
p. 63, 5.1, where DW_AT_name is a required field for DW_TAG_base_type.


-- 

ro at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ro at gcc dot gnu dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
      Known to fail|                            |4.4.3 4.6.0
   Last reconfirmed|0000-00-00 00:00:00         |2010-04-28 19:08:22
               date|                            |
            Summary|incorrect dwarf data gcc-   |[4.4, 4.5, 4.6 regression]
                   |4.4.2                       |incorrect dwarf data gcc-
                   |                            |4.4.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42278

[Bug debug/42278] [4.4/4.5/4.6 regression] incorrect dwarf data gcc-4.4.2

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.4, 4.5, 4.6 regression]  |[4.4/4.5/4.6 regression]
                   |incorrect dwarf data gcc-   |incorrect dwarf data gcc-
                   |4.4.2                       |4.4.2
   Target Milestone|---                         |4.4.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42278

[Bug debug/42278] [4.4/4.5/4.6 regression] incorrect dwarf data gcc-4.4.2

[jakub at gcc dot gnu dot org]

------- Comment #2 from jakub at gcc dot gnu dot org  2010-05-11 14:43 -------
Created an attachment (id=20632)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20632&action=view)
gcc46-pr42278.patch

Untested patch.  I'll need to see whether we don't generate too many
__unknown__ names with it (and whether other types wouldn't need similar
treatment like sizetype).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42278

[Bug debug/42278] [4.4/4.5/4.6 regression] incorrect dwarf data gcc-4.4.2

[jakub at gcc dot gnu dot org]

------- Comment #3 from jakub at gcc dot gnu dot org  2010-05-12 12:09 -------
Subject: Bug 42278

Author: jakub
Date: Wed May 12 12:08:34 2010
New Revision: 159315

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=159315
Log:
        PR debug/42278
        * dwarf2out.c (base_type_die): Don't add name attribute here.
        (modified_type_die): Instead of sizetype use
        its underlying original type.  If a DW_TAG_base_type doesn't
        have name added, add __unknown__.
        (dwarf2out_imported_module_or_decl_1): Don't call base_type_die,
        always call force_type_die instead.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42278

[Bug debug/42278] [4.4/4.5 Regression] incorrect dwarf data gcc-4.4.2

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-debug
      Known to fail|4.4.3 4.6.0                 |4.4.3 4.5.0
      Known to work|                            |4.6.0
           Priority|P3                          |P2
            Summary|[4.4/4.5/4.6 regression]    |[4.4/4.5 Regression]
                   |incorrect dwarf data gcc-   |incorrect dwarf data gcc-
                   |4.4.2                       |4.4.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42278

[Bug debug/42278] [4.4/4.5 Regression] incorrect dwarf data gcc-4.4.2

[jakub at gcc dot gnu dot org]

------- Comment #4 from jakub at gcc dot gnu dot org  2010-06-30 15:23 -------
Subject: Bug 42278

Author: jakub
Date: Wed Jun 30 15:23:13 2010
New Revision: 161608

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=161608
Log:
        Backport from mainline
        2010-05-12  Jakub Jelinek  <jakub@redhat.com>

        PR debug/42278
        * dwarf2out.c (base_type_die): Don't add name attribute here.
        (modified_type_die): Instead of sizetype use
        its underlying original type.  If a DW_TAG_base_type doesn't
        have name added, add __unknown__.
        (dwarf2out_imported_module_or_decl_1): Don't call base_type_die,
        always call force_type_die instead.

Modified:
    branches/gcc-4_5-branch/gcc/ChangeLog
    branches/gcc-4_5-branch/gcc/dwarf2out.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42278