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Re: Double ';' problem in stabs
- From: Elena Zannoni <ezannoni at cygnus dot com>
- To: "debashis mahata" <debashis dot mahata at wipro dot com>
- Cc: <gdb at sources dot redhat dot com>
- Date: Fri, 4 Jan 2002 13:57:54 -0500
- Subject: Re: Double ';' problem in stabs
- References: <001601c18f83$e123ebc0$73b17fc0@8420044-mahatad.wipro.com>
Debashis,
I have committed the suggested fix.
http://sources.redhat.com/ml/gdb-patches/2002-01/msg00035.html
Thanks
Elena
debashis mahata writes:
> Hi all,
>
> This problem was observed while using Gdb on code that is
> compiled with Sun C Compiler Forte 6 update 2.( cc - 5.3)
>
> While going through the Gdb code, I have noticed one issue
> in handling stabs for a structure / union, looks like some
> assumptions has been made about the format, which is not
> documented. The assumption made is - the structure or union
> stabs should end with two consecutive semicolon i.e. ';;'.
>
> One example (using Sun compiler) - For the structure
> struct node{
> int I;
> char C;
> };
> the generated stab is - "node:T(0,21)=s8I:(0,3),0,32;C:(0,1),32,8;;"
> where,
> $cc -V
> cc: WorkShop Compilers 5.0 98/12/15 C 5.0
>
> You can see that the stab has two consecutive ';' at the
> end. But the last ';' is not documented in Sun stab document.
> Neither the Gdb stab document says that the last ';' should be
> present. The code is in file stabsread.c (function:
> read_struct_fields()), where Gdb searches for the last ';'.
> The corresponding code is -
>
> /* Read each data member type until we find the terminating ';' at the
> end
> of
> the data member list, or break for some other reason such as
> finding
> the
> start of the member function list. */
>
> while (**pp != ';')
> {
> .....
>
> Some compilers does not generates the last ';'. For the
> above mentioned example and using the
> $cc -V
> cc: Sun WorkShop 6 update 2 C 5.3 2001/05/15
>
> compiler the generated stab is -
> "node:T(0,21)=s8I:(0,3),0,32;C:(0,1),32,8;"
>
> In this example the last ';'is missing.
>
> Questions:
> 1. Is it anywhere documented that the last ';' (the second one) should
> be present?
> 2. If not, is it a bug (the assumption that last ';' should
> be persent) in Gdb, which requires a fix?
> 3. In case a fix is required what will be the long term strategy?
>
> Thanks in advance,
> debashis
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