Annotation of gforth/comp-i.fs, revision 1.8
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:
40: : compare-images { image1 image2 reloc-bits size file-id -- }
41: \G compares image1 and image2 (of size cells) and sets reloc-bits.
42: \G offset is the difference for relocated addresses
43: \ this definition is certainly to long and too complex, but is
44: \ hard to factor.
45: image1 @ image2 @ over - { dbase doffset }
46: doffset 0= abort" images have the same dictionary base address"
47: ." data offset=" doffset . cr
48: image1 cell+ @ image2 cell+ @ over - { cbase coffset }
49: coffset 0=
50: if
51: ." images have the same code base address; producing only a data-relocatable image" cr
52: else
1.2 pazsan 53: coffset abs 22 cells <> abort" images produced by different engines"
1.1 anton 54: ." code offset=" coffset . cr
55: 0 image1 cell+ ! 0 image2 cell+ !
56: endif
57: size 0
58: u+do
59: image1 i th @ image2 i th @ { cell1 cell2 }
60: cell1 doffset + cell2 =
61: if
62: cell1 dbase - file-id write-cell throw
63: i reloc-bits set-bit
64: else
65: coffset 0<> cell1 coffset + cell2 = and
66: if
67: cell1 cbase - cell / { tag }
68: tag dodoes-tag =
69: if
70: \ make sure that the next cell will not be tagged
71: dbase negate image1 i 1+ th +!
72: dbase doffset + negate image2 i 1+ th +!
73: endif
74: -2 tag - file-id write-cell throw
75: i reloc-bits set-bit
76: else
77: cell1 file-id write-cell throw
78: cell1 cell2 <>
79: if
80: 0 i th 9 u.r cell1 17 u.r cell2 17 u.r cr
81: endif
82: endif
83: endif
84: loop ;
85:
86: : comp-image ( "image-file1" "image-file2" "new-image" -- )
87: name slurp-file { image1 size1 }
1.4 pazsan 88: image1 size1 s" Gforth2" search 0= abort" not a Gforth image"
1.1 anton 89: drop 8 + image1 - { header-offset }
90: size1 aligned size1 <> abort" unaligned image size"
1.8 ! anton 91: image1 header-offset + 2 cells + @ header-offset + size1 <> abort" header gives wrong size"
1.1 anton 92: name slurp-file { image2 size2 }
93: size1 size2 <> abort" image sizes differ"
94: name ( "new-image" ) w/o bin create-file throw { outfile }
95: size1 header-offset - 1- cell / bits/au / 1+ { reloc-size }
96: reloc-size allocate throw { reloc-bits }
97: reloc-bits reloc-size erase
98: image1 header-offset outfile write-file throw
99: base @ hex
100: image1 header-offset + image2 header-offset + reloc-bits
101: size1 header-offset - aligned cell / outfile compare-images
102: base !
103: reloc-bits reloc-size outfile write-file throw
104: outfile close-file throw ;
105:
106:
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