codiff new features

codiff new features

[Arnaldo Carvalho de Melo]

Hi,

	This is just to let you know about some new features in codiff:

commit dc5592b84424025171bf6b12d4660de5cfef76a3
Author: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Date:   Tue Mar 3 10:55:25 2009 -0300

    codiff: Detect changes in padding and the number of holes/bit_holes
    
    $ codiff -V /tmp/pahole.old build/pahole
    /home/acme/git/pahole/pahole.c:
      struct tag |   +0
       padding: +2
        refcnt
         removed: uint16_t              /*    56( 0)     2( 0) */
        recursivity_level
         from:    uint16_t              /*    58( 0)     2( 0) */
         to:      uint16_t              /*    56( 0)     2(15) */
        visited
         added:   uint16_t              /*    56(15)     2( 1) */
     1 struct changed
    
    Size is the same, but now we have padding (2 bytes).

commit 585075767171d52240457eaed58e3d1eb4823f7d
Author: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Date:   Tue Mar 3 10:31:14 2009 -0300

    codiff: improve detection removal and addition of members in structs
    
    Consider this case:
    
    $ codiff -V /tmp/pahole.old build/pahole
    /home/acme/git/pahole/pahole.c:
      struct tag |   +0
        refcnt
         removed: uint16_t              /*    56( 0)     2( 0) */
        recursivity_level
         from:    uint16_t              /*    58( 0)     2( 0) */
         to:      uint16_t              /*    56( 0)     2(15) */
        used
         added:   uint16_t              /*    56(15)     2( 1) */
     1 struct changed
    
    The number of members is the same and so is the size of the struct, but
    'refcnt' was removed (in fact renamed to used) and 'used' was added.

- Arnaldo
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