1: \ Local primitives 17jan92py
2:
3: \ Copyright (C) 1995 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: Variable loffset 0 loffset !
22: Variable locals here locals ! 100 ( some) cells allot
23: : local, ( offset -- ) postpone rp@ loffset @ swap -
24: postpone Literal postpone + ;
25: : delocal, ( offset -- ) local, postpone rp! ;
26: : (local DOES> @ local, postpone @ ;
27: : f>r r> rp@ 1 floats - dup rp! f! >r ;
28: : (flocal DOES> @ local, postpone f@ ;
29:
30: : do-nothing ;
31: : ralign r>
32: BEGIN rp@ [ 1 floats 1- ] Literal and
33: WHILE [ ' do-nothing >body ] ALiteral >r
34: REPEAT >r ;
35:
36: : <local ( -- sys1 ) current @ @ loffset @ locals @
37: over 0= IF postpone ralign THEN ; immediate
38: : local: ( -- ) postpone >r last @ lastcfa @ here locals @ dp !
39: cell loffset +! Create loffset @ , immediate (local
40: here locals ! dp ! lastcfa ! last ! ; immediate
41: : flocal: ( -- ) last @ lastcfa @ here locals @ dp !
42: BEGIN loffset @ 0 1 floats fm/mod drop WHILE
43: 0 postpone Literal postpone >r 1 cells loffset +! REPEAT
44: postpone f>r Create loffset @ , immediate (flocal
45: here locals ! dp ! lastcfa ! last ! ; immediate
46: : local> ( sys1 -- sys2 ) ; immediate
47: : local; ( sys2 -- ) locals ! dup delocal,
48: loffset ! current @ ! ; immediate
49: : TO >in @ ' dup @ [ ' (local >body cell+ ] ALiteral =
50: IF >body @ local, postpone ! drop
51: ELSE dup @ [ ' (flocal >body cell+ ] ALiteral =
52: IF >body @ local, postpone f! drop
53: ELSE drop >in ! postpone to THEN THEN ; immediate
54:
55: : DO 2 cells loffset +! postpone DO ; immediate restrict
56: : ?DO 2 cells loffset +! postpone ?DO ; immediate restrict
57: : FOR 2 cells loffset +! postpone FOR ; immediate restrict
58: : LOOP -2 cells loffset +! postpone LOOP ; immediate restrict
59: : +LOOP -2 cells loffset +! postpone +LOOP ; immediate restrict
60: : NEXT -2 cells loffset +! postpone NEXT ; immediate restrict
61: : >R 1 cells loffset +! postpone >R ; immediate restrict
62: : R> -1 cells loffset +! postpone R> ; immediate restrict
63:
64: \ High level locals 19aug93py
65:
66: : { postpone <local -1
67: BEGIN >in @ name dup c@ 1 = swap 1+ c@ '| = and UNTIL
68: drop >in @ >r
69: BEGIN dup 0< 0= WHILE >in ! postpone local: REPEAT drop
70: r> >in ! postpone local> ; immediate restrict
71:
72: : F{ postpone <local -1
73: BEGIN >in @ name dup c@ 1 = swap 1+ c@ '| = and UNTIL
74: drop >in @ >r
75: BEGIN dup 0< 0= WHILE >in ! postpone Flocal: REPEAT drop
76: r> >in ! postpone local> ; immediate restrict
77:
78: ' local; alias } immediate restrict
79:
80: \ ANS Locals 19aug93py
81:
82: Create inlocal 5 cells allot inlocal off
83: : (local) ( addr u -- ) inlocal @ 0=
84: IF postpone <local inlocal on
85: inlocal 3 cells + 2! inlocal cell+ 2! THEN
86: dup IF linestart @ >r sourceline# >r loadfile @ >r
87: blk @ >r >tib @ >r #tib @ dup >r >in @ >r
88:
89: >tib +! dup #tib ! >tib @ swap move
90: >in off blk off loadfile off -1 linestart !
91:
92: postpone local:
93:
94: r> >in ! r> #tib ! r> >tib ! r> blk !
95: r> loadfile ! r> loadline ! r> linestart !
96: ELSE 2drop inlocal cell+ 2@ inlocal 3 cells + 2@
97: postpone local>
98: inlocal 2 cells + 2! inlocal cell+ ! THEN ;
99:
100: : ?local; inlocal @
101: IF inlocal cell+ @ inlocal 2 cells + 2@
102: postpone local; inlocal off THEN ;
103:
104: : ; ?local; postpone ; ; immediate restrict
105: : DOES> ?local; postpone DOES> ; immediate
106: : EXIT inlocal @ IF 0 delocal, THEN postpone EXIT ; immediate
107:
108: : locals|
109: BEGIN name dup c@ 1 = over 1+ c@ '| = and 0= WHILE
110: count (local) REPEAT 0 (local) ; immediate restrict
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