Annotation of gforth/comp-i.fs, revision 1.10

1.1       anton       1: \ Compare nonrelocatable images and produce a relocatable image
                      2: 
1.3       anton       3: \ Copyright (C) 1996,1997,1998 Free Software Foundation, Inc.
1.1       anton       4: 
                      5: \ This file is part of Gforth.
                      6: 
                      7: \ Gforth is free software; you can redistribute it and/or
                      8: \ modify it under the terms of the GNU General Public License
                      9: \ as published by the Free Software Foundation; either version 2
                     10: \ of the License, or (at your option) any later version.
                     11: 
                     12: \ This program is distributed in the hope that it will be useful,
                     13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15: \ GNU General Public License for more details.
                     16: 
                     17: \ You should have received a copy of the GNU General Public License
                     18: \ along with this program; if not, write to the Free Software
1.5       anton      19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1       anton      20: 
                     21: s" address-unit-bits" environment? drop constant bits/au
                     22: 6 constant dodoes-tag
                     23: 
                     24: : write-cell { w^ w  file-id -- ior }
                     25:     \ write a cell to the file
                     26:     w cell file-id write-file ;
                     27: 
                     28: : th ( addr1 n -- addr2 )
                     29:     cells + ;
                     30: 
1.7       anton      31: : bset ( bmask c-addr -- )
                     32:     tuck c@ or swap c! ; 
                     33: 
1.1       anton      34: : set-bit { u addr -- }
                     35:     \ set bit u in bit-vector addr
                     36:     u bits/au /mod
                     37:     >r 1 bits/au 1- rot - lshift
1.7       anton      38:     r> addr +  bset ;
1.1       anton      39: 
1.9       anton      40: : image-data { image1 image2 i-field expected-offset -- base offset }
                     41:     image1 i-field + @ image2 i-field + @ over - { base offset }
                     42:     offset 0=
                     43:     if
                     44:        ." : images have the same base address; producing only a data-relocatable image" cr
                     45:     else
                     46:        offset abs expected-offset <> abort" images produced by different engines"
                     47:        ."  offset=" offset . cr
                     48:        0 image1 i-field + ! 0 image2 i-field + !
                     49:     endif
                     50:     base offset ;
                     51:     
                     52: 
1.1       anton      53: : compare-images { image1 image2 reloc-bits size file-id -- }
                     54:     \G compares image1 and image2 (of size cells) and sets reloc-bits.
                     55:     \G offset is the difference for relocated addresses
                     56:     \ this definition is certainly to long and too complex, but is
                     57:     \ hard to factor.
                     58:     image1 @ image2 @ over - { dbase doffset }
                     59:     doffset 0= abort" images have the same dictionary base address"
                     60:     ." data offset=" doffset . cr
1.9       anton      61:     ." code" image1 image2 cell     26 cells image-data { cbase coffset }
                     62:     ."   xt" image1 image2 11 cells 22 cells image-data { xbase xoffset }
1.1       anton      63:     size 0
                     64:     u+do
                     65:        image1 i th @ image2 i th @ { cell1 cell2 }
                     66:        cell1 doffset + cell2 =
                     67:        if
                     68:            cell1 dbase - file-id write-cell throw
                     69:            i reloc-bits set-bit
                     70:        else
                     71:            coffset 0<> cell1 coffset + cell2 = and
                     72:            if
                     73:                cell1 cbase - cell / { tag }
                     74:                tag dodoes-tag =
                     75:                if
                     76:                    \ make sure that the next cell will not be tagged
1.9       anton      77:                    \ !! can probably be optimized away with hybrid threading
1.1       anton      78:                    dbase negate image1 i 1+ th +!
                     79:                    dbase doffset + negate image2 i 1+ th +!
                     80:                endif
1.9       anton      81:                -2 tag $4000 or - file-id write-cell throw
1.1       anton      82:                i reloc-bits set-bit
                     83:            else
1.9       anton      84:                xoffset 0<> cell1 xoffset + cell2 = and
1.1       anton      85:                if
1.9       anton      86:                    cell1 xbase - cell / { tag }
                     87:                    tag dodoes-tag =
                     88:                    if
                     89:                        \ make sure that the next cell will not be tagged
                     90:                        \ !! can probably be optimized away with hybrid threading
                     91:                        dbase negate image1 i 1+ th +!
                     92:                        dbase doffset + negate image2 i 1+ th +!
                     93:                    endif
                     94:                    -2 tag - file-id write-cell throw
                     95:                    i reloc-bits set-bit
                     96:                else
                     97:                    cell1 file-id write-cell throw
                     98:                    cell1 cell2 <>
                     99:                    if
                    100:                        0 i th 9 u.r cell1 17 u.r cell2 17 u.r cr
                    101:                    endif
1.1       anton     102:                endif
                    103:            endif
                    104:        endif
                    105:     loop ;
                    106: 
                    107: : comp-image ( "image-file1" "image-file2" "new-image" -- )
                    108:     name slurp-file { image1 size1 }
1.10    ! anton     109:     image1 size1 s" Gforth3" search 0= abort" not a Gforth image"
1.1       anton     110:     drop 8 + image1 - { header-offset }
                    111:     size1 aligned size1 <> abort" unaligned image size"
1.8       anton     112:     image1 header-offset + 2 cells + @ header-offset + size1 <> abort" header gives wrong size"
1.1       anton     113:     name slurp-file { image2 size2 }
                    114:     size1 size2 <> abort" image sizes differ"
                    115:     name ( "new-image" ) w/o bin create-file throw { outfile }
                    116:     size1 header-offset - 1- cell / bits/au / 1+ { reloc-size }
                    117:     reloc-size allocate throw { reloc-bits }
                    118:     reloc-bits reloc-size erase
                    119:     image1 header-offset outfile write-file throw
                    120:     base @ hex
                    121:     image1 header-offset +  image2 header-offset +  reloc-bits
                    122:     size1 header-offset - aligned cell /  outfile  compare-images
                    123:     base !
                    124:     reloc-bits reloc-size outfile write-file throw
                    125:     outfile close-file throw ;
                    126: 
                    127:     

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