[Bug c++/12273] New: demangled symbol names unrecognised in non-debug builds

[Bug c++/12273] New: demangled symbol names unrecognised in non-debug builds

[taviso at cmpxchg8b dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12273

           Summary: demangled symbol names unrecognised in non-debug
                    builds
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned@sourceware.org
        ReportedBy: taviso@cmpxchg8b.com


DSOs that export mangled symbols are unrecognised in their mangled form this
used to work in 7.1, but for some reason doesn't seem to work any more. I'm not
sure what changed that caused it to break.

You can reproduce the problem like this, create an object with an exported
mangled symbol:

$ cat dynsym.cc
#include <stdio.h>

class GDB {
 public:
   static int whatever (void) {
     return fprintf(stderr, "Hello World\n");
 }
};

int main(int argc, char **argv)
{
   return GDB::whatever();
}
$ g++ -export-dynamic dynsym.cc -s -o dynsym

Verify the symbol is present:

$ nm -D dynsym | c++filt | grep GDB
00000000004008ca W GDB::whatever()

Try to break on the demangled symbol name:

$ gdb -q ./dynsym
(gdb) b GDB::whatever()
Can't find member of namespace, class, struct, or union named "GDB::whatever"
Hint: try 'GDB::whatever()<TAB> or 'GDB::whatever()<ESC-?>
(Note leading single quote.)

Note that if I use the mangled symbol name directly, GDB accepts it.

(gdb) b _ZN3GDB8whateverEv
Breakpoint 1 at 0x4008ce
(gdb) r
Breakpoint 1, 0x00000000004008ce in GDB::whatever() ()

I don't think this is a problem with not recognising the symbols, as
it's listed as a completion target if I try to complete on symbol
names, and info address works:

(gdb) info address GDB::whatever()
Symbol "GDB::whatever()" is at 0x4008ca in a file compiled without debugging.

This used to work, in a vanilla GDB 7.1:

$ gdb dynsym
GNU gdb (GDB) 7.1
(gdb) b GDB::whatever()
Breakpoint 1 at 0x8048639

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[Bug c++/12273] demangled symbol names unrecognised in non-debug builds

[keiths at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12273

Keith Seitz <keiths at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |keiths at redhat dot com
         AssignedTo|unassigned at sourceware    |keiths at redhat dot com
                   |dot org                     |

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[Bug c++/12273] demangled symbol names unrecognised in non-debug builds

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12273

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jan.kratochvil at redhat
                   |                            |dot com

--- Comment #1 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-01-15 20:10:30 UTC ---
From: Keith Seitz
http://sourceware.org/ml/gdb-patches/2010-12/msg00264.html

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[Bug c++/12273] demangled symbol names unrecognised in non-debug builds

[keiths at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12273

Keith Seitz <keiths at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sss@li-snyder.org

--- Comment #2 from Keith Seitz <keiths at redhat dot com> 2011-02-10 20:53:25 UTC ---
*** Bug 12462 has been marked as a duplicate of this bug. ***

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[Bug c++/12273] demangled symbol names unrecognised in non-debug builds

[keiths at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12273

--- Comment #3 from Keith Seitz <keiths at redhat dot com> 2011-02-17 21:09:23 UTC ---
Another revision:

http://sourceware.org/ml/gdb-patches/2011-02/msg00428.html

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[Bug c++/12273] demangled symbol names unrecognised in non-debug builds

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12273

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2011-03-16 21:09:00 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    kseitz@sourceware.org    2011-03-16 21:08:57

Modified files:
    gdb/testsuite  : ChangeLog 
Added files:
    gdb/testsuite/gdb.cp: cmpd-minsyms.cc cmpd-minsyms.exp 
                          ovsrch1.cc ovsrch2.cc ovsrch3.cc 
                          ovsrch4.cc ovsrch.exp ovsrch.h 

Log message:
    PR c++/12273
    * gdb.cp/cmpd-minsyms.exp: New test.
    * gdb.cp/cmpd-minsyms.cc: New file.

    PR c++/11734
    * gdb.cp/ovsrch.exp: New test.
    * gdb.cp/ovsrch.h: New file.
    * gdb.cp/ovsrch1.cc: New file.
    * gdb.cp/ovsrch2.cc: New file.
    * gdb.cp/ovsrch3.cc: New file.
    * gdb.cp/ovsrch4.cc: New file.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2636&r2=1.2637
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/cmpd-minsyms.cc.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/cmpd-minsyms.exp.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/ovsrch1.cc.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/ovsrch2.cc.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/ovsrch3.cc.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/ovsrch4.cc.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/ovsrch.exp.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/ovsrch.h.diff?cvsroot=src&r1=NONE&r2=1.1

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[Bug c++/12273] demangled symbol names unrecognised in non-debug builds

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12273

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2011-03-16 21:12:16 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    kseitz@sourceware.org    2011-03-16 21:12:13

Modified files:
    gdb            : ChangeLog linespec.c psymtab.c 
    gdb/cli        : cli-utils.h cli-utils.c 

Log message:
    * linespec.c (find_methods): Canonicalize NAME before looking
    up the symbol.
    (name_end): New function.
    (keep_name_info): New function.
    (decode_line_1): Use keep_name_info.
    (decode_compound): Likewise.
    * cli/cli-utils.h (remove_trailing_whitespace): New function.
    * cli/cli-utils.c (remove_trailing_whitespace): Likewise.

    PR c++/12273
    * linespec.c (locate_first_half): Keep overload information, too.
    (decode_compound): Use a string to represent break characters
    to escape the loop.
    If P points to a break character, do not increment it.
    For C++ and Java, keep overload information and relevant keywords.
    If we cannot find a symbol, search the minimal symbols.

    PR c++/11734
    * linespec.c (decode_compound): Rename SAVED_ARG to
    THE_REAL_SAVED_ARG.
    Make a copy of THE_REAL_SAVED_ARG in SAVED_ARG and strip
    single-quotes.
    Pass a valid block to lookup_symbol.
    (lookup_prefix_sym): Likewise.
    (find_method): Construct search name based on SYM_CLASS instead
    of SAVED_ARG.
    * psymtab.c (lookup_partial_symbol): Add language parameter.
    (lookup_symbol_aux_psymtabs): Likewise.
    Don't assume that the psymtab we found was the right one. Search
    for the desired symbol in the symtab to be certain.
    (psymtab_search_name): New function.
    (lookup_partial_symbol): Use psymtab_search_name.
    Add language parameter.
    (read_symtabs_for_function): Add language parameter and pass to
    lookup_partial_symbol.
    (find_symbol_file_from_partial): Likewise.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.12823&r2=1.12824
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/linespec.c.diff?cvsroot=src&r1=1.113&r2=1.114
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/psymtab.c.diff?cvsroot=src&r1=1.24&r2=1.25
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/cli/cli-utils.h.diff?cvsroot=src&r1=1.12&r2=1.13
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/cli/cli-utils.c.diff?cvsroot=src&r1=1.12&r2=1.13

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[Bug c++/12273] demangled symbol names unrecognised in non-debug builds

[keiths at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12273

Keith Seitz <keiths at redhat dot com> changed:

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

--- Comment #6 from Keith Seitz <keiths at redhat dot com> 2011-03-22 20:10:03 UTC ---
I think this has now been fixed.  If there are still problems, please re-open
this bug.

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