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documentation updates
fixed some portability bugs in vmgen-ex and vmgen-ex2
updated copyright years

    1: \ Compare nonrelocatable images and produce a relocatable image
    2: 
    3: \ Copyright (C) 1996,1997,1998,2002,2003 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   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: 
   31: : bset ( bmask c-addr -- )
   32:     tuck c@ or swap c! ; 
   33: 
   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
   38:     r> addr +  bset ;
   39: 
   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: : >tag ( index -- tag )
   53:     dup dodoes-tag 2 + > IF
   54: 	$21 1 DO  dup tag-offsets I cells + @ < IF
   55: 		tag-offsets I 1- cells + @ - I 1- 9 lshift + negate
   56: 		UNLOOP  EXIT  THEN  LOOP
   57:     THEN  -2 swap - ;
   58: 
   59: : compare-images { image1 image2 reloc-bits size file-id -- }
   60:     \G compares image1 and image2 (of size cells) and sets reloc-bits.
   61:     \G offset is the difference for relocated addresses
   62:     \ this definition is certainly to long and too complex, but is
   63:     \ hard to factor.
   64:     image1 @ image2 @ over - { dbase doffset }
   65:     doffset 0= abort" images have the same dictionary base address"
   66:     ." data offset=" doffset . cr
   67:     ." code" image1 image2 cell     26 cells image-data { cbase coffset }
   68:     ."   xt" image1 image2 11 cells 22 cells image-data { xbase xoffset }
   69:     size 0
   70:     u+do
   71: 	image1 i th @ image2 i th @ { cell1 cell2 }
   72: 	cell1 doffset + cell2 =
   73: 	if
   74: 	    cell1 dbase - file-id write-cell throw
   75: 	    i reloc-bits set-bit
   76: 	else
   77: 	    coffset 0<> cell1 coffset + cell2 = and
   78: 	    if
   79: 		cell1 cbase - cell / { tag }
   80: 		tag dodoes-tag =
   81: 		if
   82: 		    \ make sure that the next cell will not be tagged
   83: 		    \ !! can probably be optimized away with hybrid threading
   84: 		    dbase negate image1 i 1+ th +!
   85: 		    dbase doffset + negate image2 i 1+ th +!
   86: 		endif
   87: 		tag >tag $4000 xor file-id write-cell throw
   88: 		i reloc-bits set-bit
   89: 	    else
   90: 		xoffset 0<> cell1 xoffset + cell2 = and
   91: 		if
   92: 		    cell1 xbase - cell / { tag }
   93: 		    tag dodoes-tag =
   94: 		    if
   95: 			\ make sure that the next cell will not be tagged
   96: 			\ !! can probably be optimized away with hybrid threading
   97: 			dbase negate image1 i 1+ th +!
   98: 			dbase doffset + negate image2 i 1+ th +!
   99: 		    endif
  100: 		    tag >tag file-id write-cell throw
  101: 		    i reloc-bits set-bit
  102: 		else
  103: 		    cell1 file-id write-cell throw
  104: 		    cell1 cell2 <>
  105: 		    if
  106: 			0 i th 9 u.r cell1 17 u.r cell2 17 u.r cr
  107: 		    endif
  108: 		endif
  109: 	    endif
  110: 	endif
  111:     loop ;
  112: 
  113: : comp-image ( "image-file1" "image-file2" "new-image" -- )
  114:     name slurp-file { image1 size1 }
  115:     image1 size1 s" Gforth3" search 0= abort" not a Gforth image"
  116:     drop 8 + image1 - { header-offset }
  117:     size1 aligned size1 <> abort" unaligned image size"
  118:     image1 header-offset + 2 cells + @ header-offset + size1 <> abort" header gives wrong size"
  119:     name slurp-file { image2 size2 }
  120:     size1 size2 <> abort" image sizes differ"
  121:     name ( "new-image" ) w/o bin create-file throw { outfile }
  122:     size1 header-offset - 1- cell / bits/au / 1+ { reloc-size }
  123:     reloc-size allocate throw { reloc-bits }
  124:     reloc-bits reloc-size erase
  125:     image1 header-offset outfile write-file throw
  126:     base @ hex
  127:     image1 header-offset +  image2 header-offset +  reloc-bits
  128:     size1 header-offset - aligned cell /  outfile  compare-images
  129:     base !
  130:     reloc-bits reloc-size outfile write-file throw
  131:     outfile close-file throw ;
  132: 
  133: