Annotation of gforth/oldlib.fs, revision 1.2

1.1       pazsan      1: \ lib.fs       shared library support package          11may97py
                      2: 
1.2     ! anton       3: \ Copyright (C) 1995,1996,1997,1998,2000,2003 Free Software Foundation, Inc.
1.1       pazsan      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: Create icall-table
                     22:     ] icall0 ;s icall1 ;s icall2 ;s icall3 ;s icall4 ;s icall5 ;s icall6 ;s
                     23:       NIL swap  NIL swap  NIL swap  NIL swap  NIL swap  NIL swap  NIL swap
                     24:       NIL swap  NIL swap  NIL swap  NIL swap  NIL swap  NIL swap  icall20 ;s [
                     25: Create fcall-table
                     26:     ] fcall0 ;s fcall1 ;s fcall2 ;s fcall3 ;s fcall4 ;s fcall5 ;s fcall6 ;s
                     27:       NIL swap  NIL swap  NIL swap  NIL swap  NIL swap  NIL swap  NIL swap
                     28:       NIL swap  NIL swap  NIL swap  NIL swap  NIL swap  NIL swap  fcall20 ;s [
                     29: 
                     30: Variable libs 0 libs !
                     31: \G links between libraries
                     32: 
                     33: : @lib ( lib -- )
                     34:     \G obtains library handle
                     35:     cell+ dup 2 cells + count open-lib
                     36:     dup 0= abort" Library not found" swap ! ;
                     37: 
                     38: : @proc ( lib addr -- )
                     39:     \G obtains symbol address
                     40:     cell+ tuck 2 cells + count rot cell+ @
                     41:     lib-sym  dup 0= abort" Proc not found!" swap cell+ ! ;
                     42: 
                     43: : proc, ( pars type lib addr -- )
                     44:     \G allocates and initializes proc stub
                     45:     \G stub format:
                     46:     \G    linked list in library
                     47:     \G    address of proc
                     48:     \G    offset in lcall1-table to call proc
                     49:     \G    OS name of symbol as counted string
                     50:     here 2dup swap 2 cells + dup @ A, !
                     51:     2swap  1 and  IF  fcall-table  ELSE  icall-table  THEN  swap
                     52:     cells 2* + , 0 , bl sword string, @proc ;
                     53: 
                     54: -1 Constant (addr)
                     55:  0 Constant (int)
                     56:  1 Constant (float)
                     57:  2 Constant (void)
                     58:  4 Constant (int...)
                     59:  5 Constant (float...)
                     60:  6 Constant (void...)
                     61: 
                     62: : proc:  ( pars type lib "name" "string" -- )
                     63:     \G Creates a named proc stub
                     64:     Create proc,
                     65: DOES> ( x1 .. xn -- r )
                     66:     cell+ 2@ >r ;
                     67: 
                     68: : vaproc:  ( pars type lib "name" "string" -- )
                     69:     \G Creates a named proc stub with variable arguments
                     70:     Create proc,
                     71: DOES> ( x1 .. xn n -- r )
                     72:     cell+ 2@ rot 2* cells + >r ;
                     73: 
                     74: : (>void)  >r ;
                     75: 
                     76: : vproc:  ( pars type lib "name" "string" -- )
                     77:     \G Creates a named proc stub for void functions
                     78:     Create proc,
                     79: DOES> ( x1 .. xn -- )
                     80:     cell+ 2@ (>void) drop ;
                     81: 
                     82: : vvaproc:  ( pars type lib "name" "string" -- )
                     83:     \G Creates a named proc stub with variable arguments, void return
                     84:     Create proc,
                     85: DOES> ( x1 .. xn n -- )
                     86:     cell+ 2@ rot 2* cells + (>void) drop ;
                     87: 
                     88: : label: ( type lib "name" "string" -- )
                     89:     \G Creates a named label stub
                     90:     -1 -rot Create proc,
                     91: DOES> ( -- addr )
                     92:     [ 2 cells ] Literal + @ ;
                     93: 
                     94: : library ( "name" "file" -- )
                     95:     \G loads library "file" and creates a proc defining word "name"
                     96:     \G library format:
                     97:     \G    linked list of libraries
                     98:     \G    library handle
                     99:     \G    linked list of library's procs
                    100:     \G    OS name of library as counted string
                    101:     Create  here libs @ A, dup libs !
                    102:     0 , 0 A, bl sword string, @lib
                    103: DOES> ( pars/ type -- )
                    104:     over -1 = IF  label:
                    105:     ELSE
                    106:        over 4 and IF
                    107:            over 2 and IF  vvaproc:  ELSE  vaproc:  THEN
                    108:        ELSE
                    109:            over 2 and IF  vproc:  ELSE  proc:  THEN
                    110:        THEN
                    111:     THEN ;
                    112: 
                    113: : init-shared-libs ( -- )
                    114:     defers 'cold  libs
                    115:     0  libs  BEGIN  @ dup  WHILE  dup  REPEAT  drop
                    116:     BEGIN  dup  WHILE  >r
                    117:        r@ @lib
                    118:        r@ 2 cells +  BEGIN  @ dup  WHILE  r@ over @proc  REPEAT
                    119:        drop rdrop
                    120:     REPEAT  drop ;
                    121: 
                    122: ' init-shared-libs IS 'cold

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