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Refactoring almost finished - lacks a small test

    1: \ Compare nonrelocatable images and produce a relocatable image
    2: 
    3: \ Copyright (C) 1996,1997,1998,2002,2003,2004,2007,2010 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 3
   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, see http://www.gnu.org/licenses/.
   19: 
   20: s" address-unit-bits" environment? drop constant bits/au
   21: 7 constant dodoes-tag
   22: 
   23: : write-cell { w^ w  file-id -- ior }
   24:     \ write a cell to the file
   25:     w cell file-id write-file ;
   26: 
   27: : bset ( bmask c-addr -- )
   28:     tuck c@ or swap c! ; 
   29: 
   30: : set-bit { u addr -- }
   31:     \ set bit u in bit-vector addr
   32:     u bits/au /mod
   33:     >r 1 bits/au 1- rot - lshift
   34:     r> addr +  bset ;
   35: 
   36: : image-data { image1 image2 i-field expected-offset -- base offset }
   37:     image1 i-field + @ image2 i-field + @ over - { base offset }
   38:     offset 0=
   39:     if
   40: 	." : images have the same base address; producing only a data-relocatable image" cr
   41:     else
   42: 	\ the following sanity check produces false positices with exec-shield
   43: 	\ offset abs expected-offset <> abort" images produced by different engines"
   44: 	."  offset=" offset . cr
   45: 	0 image1 i-field + ! 0 image2 i-field + !
   46:     endif
   47:     base offset ;
   48: 
   49: : >tag ( index -- tag )
   50:     dup dodoes-tag 2 + > IF
   51: 	$21 1 DO  dup tag-offsets I cells + @ < IF
   52: 		tag-offsets I 1- cells + @ - I 1- 9 lshift + negate
   53: 		UNLOOP  EXIT  THEN  LOOP
   54:     THEN  -2 swap - ;
   55: 
   56: : compare-images { image1 image2 reloc-bits size file-id -- }
   57:     \G compares image1 and image2 (of size cells) and sets reloc-bits.
   58:     \G offset is the difference for relocated addresses
   59:     \ this definition is certainly to long and too complex, but is
   60:     \ hard to factor.
   61:     image1 @ image2 @ over - { dbase doffset }
   62:     doffset 0= abort" images have the same dictionary base address"
   63:     ." data offset=" doffset . cr
   64:     ." code" image1 image2 cell     26 cells image-data { cbase coffset }
   65:     ."   xt" image1 image2 13 cells 22 cells image-data { xbase xoffset }
   66:     size 0
   67:     u+do
   68: 	image1 i th @ image2 i th @ { cell1 cell2 }
   69: 	cell1 doffset + cell2 =
   70: 	if
   71: 	    cell1 dbase - file-id write-cell throw
   72: 	    i reloc-bits set-bit
   73: 	else
   74: 	    coffset 0<> cell1 coffset + cell2 = and
   75: 	    if
   76: 		cell1 cbase - cell / { tag }
   77: 		tag >tag $4000 xor file-id write-cell throw
   78: 		i reloc-bits set-bit
   79: 	    else
   80: 		xoffset 0<> cell1 xoffset + cell2 = and
   81: 		if
   82: 		    cell1 xbase - cell / { tag }
   83: 		    tag >tag file-id write-cell throw
   84: 		    i reloc-bits set-bit
   85: 		else
   86: 		    cell1 file-id write-cell throw
   87: 		    cell1 cell2 <>
   88: 		    if
   89: 			0 i th 9 u.r cell1 17 u.r cell2 17 u.r cr
   90: 		    endif
   91: 		endif
   92: 	    endif
   93: 	endif
   94:     loop ;
   95: 
   96: : comp-image ( "image-file1" "image-file2" "new-image" -- )
   97:     name slurp-file { image1 size1 }
   98:     image1 size1 s" Gforth4" search 0= abort" not a Gforth image"
   99:     drop 8 + image1 - { header-offset }
  100:     size1 aligned size1 <> abort" unaligned image size"
  101:     image1 header-offset + 2 cells + @ header-offset + size1 <> abort" header gives wrong size"
  102:     name slurp-file { image2 size2 }
  103:     size1 size2 <> abort" image sizes differ"
  104:     name ( "new-image" ) w/o bin create-file throw { outfile }
  105:     size1 header-offset - 1- cell / bits/au / 1+ { reloc-size }
  106:     reloc-size allocate throw { reloc-bits }
  107:     reloc-bits reloc-size erase
  108:     image1 header-offset outfile write-file throw
  109:     base @ hex
  110:     image1 header-offset +  image2 header-offset +  reloc-bits
  111:     size1 header-offset - aligned cell /  outfile  compare-images
  112:     base !
  113:     reloc-bits reloc-size outfile write-file throw
  114:     outfile close-file throw ;
  115: 
  116: