[Bug c++/11226] New: gdb cannot print member in base class

[Bug c++/11226] New: gdb cannot print member in base class

[duanhuaiyu at gmail dot com]

Here is a simple example. (Although "virtual" is not necessary here, but my big code has it.)
===============================
using namespace std;

namespace mc {
  class Base {
  protected:
    int x;
    
  public:
    Base(void) { x = 2; };
  };
}

namespace ph {
  class Middle: public virtual mc::Base {
  protected:
    int y;
    
  public:
    Middle(void): mc::Base() { y = 3; };

    int get_y(void)
    { return y; };
  };

  class Derived: public virtual Middle {
  protected:
    int z;
    
  public:
    Derived(void): Middle() { z = 4; };

    int get_z(void)
    { return z; };
  };
}

int main() {

  ph::Derived tst;
  tst.get_y();
  tst.get_z();
  
  return 0;
}
===============================

Here is the gdb session. It is on Ubuntu 9.04.
===============================
$ g++ -v
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.3-5ubuntu4' --with-
bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs --enable-languages=c,c++,fortran,objc,obj-
c++ --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-
gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3 --
program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --
enable-mpfr --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --
host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) 
$ g++ -g -Wall tst.cc
$ gdb a.out
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu"...
(gdb) b ph::Middle::get_y
Breakpoint 1 at 0x400862: file tst.cc, line 24.
(gdb) b ph::Derived::get_z
Breakpoint 2 at 0x4008d0: file tst.cc, line 35.
(gdb) r
Starting program: /home/hduan/tmp/a.out 

Breakpoint 1, ph::Middle::get_y (this=0x7fff5295f2d0) at tst.cc:24
24	    { return y; };
(gdb) p *this
$1 = {<mc::Base> = {x = 4196952}, _vptr.Middle = 0x400a58, y = 3}
(gdb) p x
$2 = 4196952
(gdb) c
Continuing.

Breakpoint 2, ph::Derived::get_z (this=0x7fff5295f2c0) at tst.cc:35
35	    { return z; };
(gdb) p *this
$3 = {<ph::Middle> = {<mc::Base> = {x = 2}, _vptr.Middle = 0x400a58, y = 3}, 
  _vptr.Derived = 0x400a40, z = 4}
(gdb) p x
There is no member or method named x.
===============================

-- 
           Summary: gdb cannot print member in base class
           Product: gdb
           Version: 6.8
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: duanhuaiyu at gmail dot com
                CC: gdb-prs at sourceware dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=11226

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[Bug c++/11226] gdb cannot print member in base class

[tromey at redhat dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-01-27 19:20:10
               date|                            |


http://sourceware.org/bugzilla/show_bug.cgi?id=11226

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[Bug c++/11226] gdb cannot print member in base class

[tromey at redhat dot com]

------- Additional Comments From tromey at redhat dot com  2010-01-27 21:45 -------
I'm testing a patch.

Thanks for the concise test case.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at sourceware dot|tromey at redhat dot com
                   |org                         |
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2010-01-27 19:20:10         |2010-01-27 21:45:36
               date|                            |


http://sourceware.org/bugzilla/show_bug.cgi?id=11226

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[Bug c++/11226] gdb cannot print member in base class

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2010-02-02 16:45 -------
Subject: Bug 11226

CVSROOT:	/cvs/src
Module name:	src
Changes by:	tromey@sourceware.org	2010-02-02 16:45:18

Modified files:
	gdb            : ChangeLog c-lang.h c-valprint.c cp-valprint.c 
	                 language.h valops.c 
	gdb/python     : py-prettyprint.c 
	gdb/testsuite  : ChangeLog 
	gdb/testsuite/gdb.cp: userdef.exp 
Added files:
	gdb/testsuite/gdb.cp: virtbase.cc virtbase.exp 

Log message:
	gdb
	PR c++/11226, PR c++/9629, PR c++/9688, PR c++/8890:
	* valops.c (search_struct_field): Compute nbases after calling
	CHECK_TYPEDEF.
	(check_field): Call CHECK_TYPEDEF.
	* cp-valprint.c (cp_print_value): Pass correct address to
	baseclass_offset.  Fix check for virtual base past the end of the
	object.  Don't offset address passed to cp_print_value_fields or
	apply_val_pretty_printer.
	(cp_print_value_fields): Fix call to val_print.
	(cp_print_value_fields_rtti): New function.
	* c-valprint.c (c_val_print): Use cp_print_value_fields_rtti.
	* p-valprint.c (pascal_object_print_value_fields): Fix call to
	val_print.
	* python/py-prettyprint.c (apply_val_pretty_printer): Add embedded
	offset to address.
	* language.h (struct language_defn) <la_val_print>: Document.
	* c-lang.h (cp_print_value_fields_rtti): Declare.
	gdb/testsuite
	PR c++/11226, PR c++/9629, PR c++/9688, PR c++/8890:
	* gdb.cp/virtbase.cc: New file.
	* gdb.cp/virtbase.exp: New file.
	* gdb.cp/userdef.exp: Allow 'struct' or 'class'.

Patches:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.11313&r2=1.11314
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/c-lang.h.diff?cvsroot=src&r1=1.26&r2=1.27
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/c-valprint.c.diff?cvsroot=src&r1=1.66&r2=1.67
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/cp-valprint.c.diff?cvsroot=src&r1=1.62&r2=1.63
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/language.h.diff?cvsroot=src&r1=1.62&r2=1.63
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/valops.c.diff?cvsroot=src&r1=1.233&r2=1.234
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/python/py-prettyprint.c.diff?cvsroot=src&r1=1.4&r2=1.5
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2117&r2=1.2118
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/virtbase.cc.diff?cvsroot=src&r1=NONE&r2=1.1
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/virtbase.exp.diff?cvsroot=src&r1=NONE&r2=1.1
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.cp/userdef.exp.diff?cvsroot=src&r1=1.12&r2=1.13



-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=11226

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[Bug c++/11226] gdb cannot print member in base class

[tromey at redhat dot com]

------- Additional Comments From tromey at redhat dot com  2010-02-02 16:48 -------
Fix checked in.

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


http://sourceware.org/bugzilla/show_bug.cgi?id=11226

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