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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: loclabel.fth | |
4 | \ | |
5 | \ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. | |
6 | \ | |
7 | \ - Do no alter or remove copyright notices | |
8 | \ | |
9 | \ - Redistribution and use of this software in source and binary forms, with | |
10 | \ or without modification, are permitted provided that the following | |
11 | \ conditions are met: | |
12 | \ | |
13 | \ - Redistribution of source code must retain the above copyright notice, | |
14 | \ this list of conditions and the following disclaimer. | |
15 | \ | |
16 | \ - Redistribution in binary form must reproduce the above copyright notice, | |
17 | \ this list of conditions and the following disclaimer in the | |
18 | \ documentation and/or other materials provided with the distribution. | |
19 | \ | |
20 | \ Neither the name of Sun Microsystems, Inc. or the names of contributors | |
21 | \ may be used to endorse or promote products derived from this software | |
22 | \ without specific prior written permission. | |
23 | \ | |
24 | \ This software is provided "AS IS," without a warranty of any kind. | |
25 | \ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, | |
26 | \ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A | |
27 | \ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN | |
28 | \ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR | |
29 | \ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR | |
30 | \ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN | |
31 | \ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR | |
32 | \ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE | |
33 | \ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, | |
34 | \ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF | |
35 | \ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. | |
36 | \ | |
37 | \ You acknowledge that this software is not designed, licensed or | |
38 | \ intended for use in the design, construction, operation or maintenance of | |
39 | \ any nuclear facility. | |
40 | \ | |
41 | \ ========== Copyright Header End ============================================ | |
42 | \ loclabel.fth 2.10 02/05/02 | |
43 | \ Copyright 1985-1990 Bradley Forthware | |
44 | \ Copyright 1990-2002 Sun Microsystems, Inc. All Rights Reserved | |
45 | \ Copyright Use is subject to license terms. | |
46 | ||
47 | \ Local labels for the assembler. | |
48 | \ A local label can be inserted in an assembly-language program | |
49 | \ to mark a position. A relative branch instruction can then reference | |
50 | \ that location by its local name. | |
51 | \ | |
52 | \ Local label names: 0 L: 1 L: 2 L: 3 L: etc. | |
53 | \ Local label forward references: 0 F: 1 F: etc | |
54 | \ Local label backward references: 0 B: 1 B: etc | |
55 | \ | |
56 | \ There are 5 local labels, numbered 0 to 4. | |
57 | \ Each local label may be referenced from up to 10 locations. | |
58 | \ | |
59 | decimal | |
60 | also assembler definitions | |
61 | ||
62 | headerless | |
63 | 20 constant #references-max | |
64 | 10 constant #labels-max | |
65 | ||
66 | #labels-max #references-max * /n* buffer: references | |
67 | #labels-max /n* buffer: local-labels | |
68 | #labels-max /n* buffer: next-references | |
69 | ||
70 | : >reference ( index -- adr ) /n* #references-max * references + ; | |
71 | ||
72 | : >label ( index -- adr ) local-labels swap na+ ; | |
73 | ||
74 | : >next-reference ( index -- adr ) next-references swap na+ ; | |
75 | ||
76 | : resolve-forward-references ( label# -- ) | |
77 | dup >next-reference @ | |
78 | [ also forth ] swap [ previous ] >reference | |
79 | ||
80 | ?do i @ >resolve /n +loop | |
81 | ; | |
82 | ||
83 | \ Erase all forward references from this label | |
84 | : clear-label ( label# -- ) dup >reference swap >next-reference ! ; | |
85 | ||
86 | headers | |
87 | : L: ( label# -- ) | |
88 | dup resolve-forward-references ( label# ) | |
89 | dup >label over >next-reference ! ( label# ) | |
90 | dup clear-label ( label# ) | |
91 | >label <mark [ also forth ] swap [ previous ] ! | |
92 | ; | |
93 | ||
94 | : B: ( label# -- adr ) \ Find the address of a backward reference | |
95 | >label @ <resolve | |
96 | ; | |
97 | ||
98 | : F: ( label# -- adr ) \ Remember a forward reference | |
99 | >mark | |
100 | over >next-reference @ ! | |
101 | /n [ also forth ] swap [ previous ] >next-reference +! | |
102 | here \ the address we leave is a dummy | |
103 | ; | |
104 | ||
105 | headerless | |
106 | : init-labels ( -- ) | |
107 | #labels-max 0 do i clear-label loop | |
108 | ; | |
109 | ||
110 | init-labels | |
111 | ||
112 | [ifexist] do-label-hook | |
113 | ||
114 | ' init-labels is do-label-hook | |
115 | ||
116 | [else] | |
117 | ||
118 | where ." Bootstrap code.." cr | |
119 | \ Bootstrapping.. | |
120 | ||
121 | also forth definitions | |
122 | : code code [ also assembler ] init-labels [ previous ] ; | |
123 | : label label [ also assembler ] init-labels [ previous ] ; | |
124 | previous definitions | |
125 | ||
126 | [then] | |
127 | ||
128 | ||
129 | previous definitions |