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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: catchsel.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 | id: @(#)catchsel.fth 2.5 03/12/08 13:21:57 | |
43 | purpose: | |
44 | copyright: Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved | |
45 | copyright: Copyright 1985-1990 Bradley Forthware | |
46 | copyright: Use is subject to license terms. | |
47 | ||
48 | \ Special version of catch and throw for Open Boot PROMs. This version | |
49 | \ saves and restores the "my-self" current package instance variable. | |
50 | ||
51 | 0 value my-self | |
52 | ||
53 | nuser handler \ Most recent exception handler | |
54 | ||
55 | \ This was nasty, but we no longer need to arrange things so that my-self | |
56 | \ can be defined later. | |
57 | \ The new kernel 'is' is now about 30% faster than even an avalue , so | |
58 | \ moving my-self into devtree.fth is no longer a performance win. | |
59 | ||
60 | \ : get-my-self ( -- n ) 0 ; | |
61 | \ : set-my-self ( n -- ) drop ; | |
62 | ||
63 | : catch ( execution-token -- error# | 0 ) | |
64 | ( token ) \ Return address is already on the stack | |
65 | sp@ >r ( token ) \ Save data stack pointer | |
66 | my-self >r ( token ) \ Save current package instance handle | |
67 | handler @ >r ( token ) \ Previous handler | |
68 | rp@ handler ! ( token ) \ Set current handler to this one | |
69 | execute ( ) \ Execute the word passed in on the stack | |
70 | r> handler ! ( ) \ Restore previous handler | |
71 | r> drop ( ) \ Discard saved package instance handle | |
72 | r> drop ( ) \ Discard saved stack pointer | |
73 | 0 ( 0 ) \ Signify normal completion | |
74 | ; | |
75 | ||
76 | : throw ( ??? [ error# | 0 ] -- ???' [ error# ] ) \ Returns to saved context | |
77 | ?dup if \ Don't throw 0 | |
78 | handler @ rp! ( err# ) \ Return to saved return stack context | |
79 | r> handler ! ( err# ) \ Restore previous handler | |
80 | r> is my-self ( err# ) \ Restore package instance handle | |
81 | ( err# ) \ Remember error# on return stack | |
82 | ( err# ) \ before changing data stack pointer | |
83 | r> swap >r ( saved-sp ) \ err# is on return stack | |
84 | sp! drop r> ( err# ) \ Change stack pointer | |
85 | \ This return will return to the caller of catch, because the return | |
86 | \ stack has been restored to the state that existed when CATCH began | |
87 | \ execution . | |
88 | then | |
89 | ; |