Re: [PATCH] DW_AT_calling_convention support

[Daniel Jacobowitz <drow at mvista dot com>]

On Tue, Jul 09, 2002 at 05:20:05PM -0400, Petr Sorfa wrote:
> Hi,
> 
> Patch for supporting DW_AT_calling_convention. This helps GDB identify
> the "main" program for languages that do not have a starting subroutine
> called "main". The patch also adds a new type flag,
> TYPE_FLAG_MAIN_PROGRAM which is set if the type is describing a "main"
> entry point. This can be used, for example, in noting a subroutine type
> as a FORTRAN PROGRAM.
> 
> 2002-07-09 Petr Sorfa (petrs@caldera.com)
> 
>         *  dwarf2read.c (read_subroutine_type): Expanded to recognize
>            the DW_AT_calling_convention DWARF attribute and for
>            DW_CC_program set the TYPE_FLAG_MAIN_PROGRAM type flag
>            and call set_main_name ().
>            (read_partial_die): Now recognizes the
>            DW_AT_calling_convention attribute and calls set_main_name().
>            Note that TYPE_FLAG_MAIN_PROGRAM type flag is not set, as
>            the partial_die might not denote a subroutine type.
> 
>         *  gdbtypes.h (TYPE_FLAG_MAIN_PROGRAM): New type flag which
>            indicates whether the type denotes a main program subroutine.
>            (TYPE_MAIN_PROGRAM): New macro that returns a non-zero value
>            if the type describes a main program subroutine.

Why is the type flag necessary?  It seems wasteful to allocate a bit in
every type when there will presumably only be one such routine.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer