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* [Bug c++/9607] print displays wrong value of char-pointer in a class, delivered as function parameter
[not found] <20080818193801.9607.cmayer@xp8.de>
@ 2009-05-20 22:58 ` tromey at redhat dot com
2009-05-21 19:03 ` tromey at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: tromey at redhat dot com @ 2009-05-20 22:58 UTC (permalink / raw)
To: gdb-prs
------- 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 **) ¶m)[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.
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^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug c++/9607] print displays wrong value of char-pointer in a class, delivered as function parameter
[not found] <20080818193801.9607.cmayer@xp8.de>
2009-05-20 22:58 ` tromey at redhat dot com
@ 2009-05-21 19:03 ` tromey at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: tromey at redhat dot com @ 2009-05-21 19:03 UTC (permalink / raw)
To: gdb-prs
------- 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.
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2010-10-11 22:14 ` [Bug c++/9607] print displays wrong value of char-pointer in a class, delivered as function parameter tromey at redhat dot com
[not found] <20080818193801.9607.cmayer@xp8.de>
2009-05-20 22:58 ` tromey at redhat dot com
2009-05-21 19:03 ` tromey at redhat dot com
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