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Re: Double ';' problem in stabs


I have committed the suggested fix.


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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