[Bug c++/16675] New: invalid value of sizeof or reference in gdb

[Bug c++/16675] New: invalid value of sizeof or reference in gdb

[vladi_ian at yahoo dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16675

            Bug ID: 16675
           Summary: invalid value of sizeof or reference in gdb
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: vladi_ian at yahoo dot com

problem with printing size of reference in gdb. The output is the size of
pointer, not the size of type.
In the next program
#include <iostream>
int main()
{
    typedef unsigned char a4[4];
    a4 p1;
    a4& p2 = p1;
    std::cout<<sizeof(p2);
    return 0;
}

Compile, start gdb and put breakpoint on return. If you type p sizeof(p2), gdb
will print 8 instead of 4 which will be printed if you start the program. If
you write in gdb p sizeof(*p2), the output is 4 (the size of array). I think
this is because gdb treats p2 as pointer(reference is implemented behind the
scene as pointer).

Tested with compilers GCC 4.8.2 and Clang 4.3 on GDB 7.7 linux arch., ubuntu
13.10,

There are also examples in
http://stackoverflow.com/questions/22255860/sizeof-reference-to-array-in-gdb?noredirect=1#comment33814516_22255860

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[Bug c++/16675] invalid value of sizeof of reference in gdb

[vladi_ian at yahoo dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16675

Vladimir Yanakiev <vladi_ian at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|invalid value of sizeof or  |invalid value of sizeof of
                   |reference in gdb            |reference in gdb

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[Bug c++/16675] invalid value of sizeof of reference in gdb

[keiths at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16675

Keith Seitz <keiths at redhat dot com> changed:

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

--- Comment #1 from Keith Seitz <keiths at redhat dot com> ---
Thank you for the report. I've submitted the following patch for approval:
https://sourceware.org/ml/gdb-patches/2014-03/msg00541.html

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[Bug c++/16675] invalid value of sizeof of reference in gdb

[keiths at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16675

Keith Seitz <keiths at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |7.8

--- Comment #2 from Keith Seitz <keiths at redhat dot com> ---
(In reply to Keith Seitz from comment #1)
> Thank you for the report. I've submitted the following patch for approval:
> https://sourceware.org/ml/gdb-patches/2014-03/msg00541.html

Patches approved and committed.

https://sourceware.org/ml/gdb-patches/2014-04/msg00225.html

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