[Bug c++/9607] print displays wrong value of char-pointer in a class, delivered as function parameter

[Bug c++/9607] print displays wrong value of char-pointer in a class, delivered as function parameter

[tromey at redhat dot com]

------- Additional Comments From tromey at redhat dot com  2009-05-20 22:58 -------
I can use a trick to see the string:

(gdb) p ((char **) &param)[1]
$2 = 0x8048936 "TestValue"

gdb appears to be printing the "zeroth slot" of the object rather than the first.
This in turns appears to be a debug info problem, afaict:

 <1><33f4>: Abbrev Number: 79 (DW_TAG_class_type)
    <33f5>   DW_AT_name        : (indirect string, offset: 0x19b8): myclass     
    <33f9>   DW_AT_byte_size   : 4      
    <33fa>   DW_AT_decl_file   : 29     
    <33fb>   DW_AT_decl_line   : 9      
    <33fc>   DW_AT_sibling     : <0x343e>       
 <2><3400>: Abbrev Number: 80 (DW_TAG_member)
    <3401>   DW_AT_name        : str    
    <3405>   DW_AT_decl_file   : 29     
    <3406>   DW_AT_decl_line   : 11     
    <3407>   DW_AT_type        : <0xaef>        
    <340b>   DW_AT_data_member_location: 2 byte block: 23 0    
(DW_OP_plus_uconst: 0)


It seems to me that the data member location should not be 0.
However, I am not certain; I'll have to do more reading.

-- 
           What    |Removed                     |Added
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                 CC|                            |tromey at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=9607

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[Bug c++/9607] print displays wrong value of char-pointer in a class, delivered as function parameter

[tromey at redhat dot com]

------- Additional Comments From tromey at redhat dot com  2009-05-21 19:03 -------
This diagnosis is wrong -- I'm not sure what I was thinking here,
since this class doesn't have a vtable.  So, the string should appear
at offset 0.
This could be bad debug info elsewhere.  Or an undiagnosed bug in gdb.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=9607

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[Bug c++/9607] print displays wrong value of char-pointer in a class, delivered as function parameter

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=9607

Tom Tromey <tromey at redhat dot com> changed:

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

--- Comment #3 from Tom Tromey <tromey at redhat dot com> 2010-10-11 22:13:52 UTC ---
I think this is a bug in g++.
Closing as a dup of the gdb tracker.

*** This bug has been marked as a duplicate of bug 11836 ***

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