[gforth] / gforth / comp-i.fs  

gforth: gforth/comp-i.fs

Diff for /gforth/comp-i.fs between version 1.9 and 1.18

version 1.9, Mon Jan 14 08:40:23 2002 UTC version 1.18, Mon Dec 31 17:34:58 2007 UTC
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 \ Compare nonrelocatable images and produce a relocatable image  \ Compare nonrelocatable images and produce a relocatable image
   
 \ Copyright (C) 1996,1997,1998 Free Software Foundation, Inc.  \ Copyright (C) 1996,1997,1998,2002,2003,2004,2007 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
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 \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.  \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   
 s" address-unit-bits" environment? drop constant bits/au  s" address-unit-bits" environment? drop constant bits/au
 6 constant dodoes-tag  7 constant dodoes-tag
   
 : write-cell { w^ w  file-id -- ior }  : write-cell { w^ w  file-id -- ior }
     \ write a cell to the file      \ write a cell to the file
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     if      if
         ." : images have the same base address; producing only a data-relocatable image" cr          ." : images have the same base address; producing only a data-relocatable image" cr
     else      else
         offset abs expected-offset <> abort" images produced by different engines"          \ the following sanity check produces false positices with exec-shield
           \ offset abs expected-offset <> abort" images produced by different engines"
         ."  offset=" offset . cr          ."  offset=" offset . cr
         0 image1 i-field + ! 0 image2 i-field + !          0 image1 i-field + ! 0 image2 i-field + !
     endif      endif
     base offset ;      base offset ;
   
   : >tag ( index -- tag )
       dup dodoes-tag 2 + > IF
           $21 1 DO  dup tag-offsets I cells + @ < IF
                   tag-offsets I 1- cells + @ - I 1- 9 lshift + negate
                   UNLOOP  EXIT  THEN  LOOP
       THEN  -2 swap - ;
   
 : compare-images { image1 image2 reloc-bits size file-id -- }  : compare-images { image1 image2 reloc-bits size file-id -- }
     \G compares image1 and image2 (of size cells) and sets reloc-bits.      \G compares image1 and image2 (of size cells) and sets reloc-bits.
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                     dbase negate image1 i 1+ th +!                      dbase negate image1 i 1+ th +!
                     dbase doffset + negate image2 i 1+ th +!                      dbase doffset + negate image2 i 1+ th +!
                 endif                  endif
                 -2 tag $4000 or - file-id write-cell throw                  tag >tag $4000 xor file-id write-cell throw
                 i reloc-bits set-bit                  i reloc-bits set-bit
             else              else
                 xoffset 0<> cell1 xoffset + cell2 = and                  xoffset 0<> cell1 xoffset + cell2 = and
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                         dbase negate image1 i 1+ th +!                          dbase negate image1 i 1+ th +!
                         dbase doffset + negate image2 i 1+ th +!                          dbase doffset + negate image2 i 1+ th +!
                     endif                      endif
                     -2 tag - file-id write-cell throw                      tag >tag file-id write-cell throw
                     i reloc-bits set-bit                      i reloc-bits set-bit
                 else                  else
                     cell1 file-id write-cell throw                      cell1 file-id write-cell throw
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 : comp-image ( "image-file1" "image-file2" "new-image" -- )  : comp-image ( "image-file1" "image-file2" "new-image" -- )
     name slurp-file { image1 size1 }      name slurp-file { image1 size1 }
     image1 size1 s" Gforth2" search 0= abort" not a Gforth image"      image1 size1 s" Gforth3" search 0= abort" not a Gforth image"
     drop 8 + image1 - { header-offset }      drop 8 + image1 - { header-offset }
     size1 aligned size1 <> abort" unaligned image size"      size1 aligned size1 <> abort" unaligned image size"
     image1 header-offset + 2 cells + @ header-offset + size1 <> abort" header gives wrong size"      image1 header-offset + 2 cells + @ header-offset + size1 <> abort" header gives wrong size"

Generate output suitable for use with a patch program
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