Annotation of gforth/comp-image.fs, revision 1.4
1.1 anton 1: \ Compare nonrelocatable images and produce a relocatable image
2:
3: \ Copyright (C) 1996 Free Software Foundation, Inc.
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
19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20:
21: s" address-unit-bits" environment? drop constant bits/au
1.3 anton 22: 6 constant dodoes-tag
1.1 anton 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:
31: : set-bit { u addr -- }
32: \ set bit u in bit-vector addr
33: u bits/au /mod
34: >r 1 bits/au 1- rot - lshift
35: r> addr + cset ;
36:
37: : compare-images { image1 image2 reloc-bits size file-id -- }
1.3 anton 38: \G compares image1 and image2 (of size cells) and sets reloc-bits.
39: \G offset is the difference for relocated addresses
40: \ this definition is certainly to long and too complex, but is
41: \ hard to factor.
42: image1 @ image2 @ over - { dbase doffset }
43: doffset 0= abort" images have the same dictionary base address"
44: ." data offset=" doffset . cr
45: image1 cell+ @ image2 cell+ @ over - { cbase coffset }
46: coffset 0=
47: if
48: ." images have the same code base address; producing only a data-relocatable image" cr
49: else
50: coffset abs 11 cells <> abort" images produced by different engines"
51: ." code offset=" coffset . cr
52: 0 image1 cell+ ! 0 image2 cell+ !
53: endif
1.1 anton 54: size 0
55: u+do
56: image1 i th @ image2 i th @ { cell1 cell2 }
1.3 anton 57: cell1 doffset + cell2 =
58: if
59: cell1 dbase - file-id write-cell throw
1.1 anton 60: i reloc-bits set-bit
61: else
1.4 ! anton 62: coffset 0<> cell1 coffset + cell2 = and
1.3 anton 63: if
64: cell1 cbase - cell / { tag }
65: tag dodoes-tag =
66: if
67: \ make sure that the next cell will not be tagged
68: dbase negate image1 i 1+ th +!
69: dbase doffset + negate image2 i 1+ th +!
70: endif
71: -2 tag - file-id write-cell throw
72: i reloc-bits set-bit
73: else
74: cell1 file-id write-cell throw
75: cell1 cell2 <>
76: if
77: 0 i th 9 u.r cell1 17 u.r cell2 17 u.r cr
78: endif
1.1 anton 79: endif
80: endif
81: loop ;
82:
83: : slurp-file ( c-addr1 u1 -- c-addr2 u2 )
84: \ c-addr1 u1 is the filename, c-addr2 u2 is the file's contents
85: r/o bin open-file throw >r
1.3 anton 86: r@ file-size throw abort" file too large"
87: dup allocate throw swap
88: 2dup r@ read-file throw over <> abort" could not read whole file"
89: r> close-file throw ;
1.1 anton 90:
91: : comp-image ( "image-file1" "image-file2" "new-image" -- )
1.3 anton 92: name slurp-file { image1 size1 }
1.1 anton 93: image1 size1 s" Gforth1" search 0= abort" not a Gforth image"
94: drop 8 + image1 - { header-offset }
95: size1 aligned size1 <> abort" unaligned image size"
96: size1 image1 header-offset + 2 cells + @ header-offset + <> abort" header gives wrong size"
1.3 anton 97: name slurp-file { image2 size2 }
98: size1 size2 <> abort" image sizes differ"
99: name ( "new-image" ) w/o bin create-file throw { outfile }
1.1 anton 100: size1 header-offset - 1- cell / bits/au / 1+ { reloc-size }
1.3 anton 101: reloc-size allocate throw { reloc-bits }
1.1 anton 102: reloc-bits reloc-size erase
103: image1 header-offset outfile write-file throw
104: base @ hex
105: image1 header-offset + image2 header-offset + reloc-bits
106: size1 header-offset - aligned cell / outfile compare-images
107: base !
108: reloc-bits reloc-size outfile write-file throw
109: outfile close-file throw ;
110:
111:
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