Powered by ViewCVS 1.0-dev
| 1 : | anton | 1.1 | \ catch, throw, etc. |
| 2 : | |||
| 3 : | anton | 1.7 | \ Copyright (C) 1999,2000,2003 Free Software Foundation, Inc. |
| 4 : | anton | 1.1 | |
| 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 : | anton | 1.3 | \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
| 20 : | anton | 1.1 | |
| 21 : | \ !! use a separate exception stack? anton | ||
| 22 : | |||
| 23 : | \ user-definable rollback actions | ||
| 24 : | |||
| 25 : | Defer 'catch | ||
| 26 : | Defer 'throw | ||
| 27 : | |||
| 28 : | ' noop IS 'catch | ||
| 29 : | ' noop IS 'throw | ||
| 30 : | |||
| 31 : | \ has? backtrace [IF] | ||
| 32 : | Defer store-backtrace | ||
| 33 : | ' noop IS store-backtrace | ||
| 34 : | \ [THEN] | ||
| 35 : | |||
| 36 : | anton | 1.5 | : (try) ( ahandler -- ) |
| 37 : | anton | 1.1 | r> |
| 38 : | anton | 1.5 | swap >r \ recovery address |
| 39 : | anton | 1.1 | rp@ 'catch >r |
| 40 : | sp@ >r | ||
| 41 : | fp@ >r | ||
| 42 : | lp@ >r | ||
| 43 : | handler @ >r | ||
| 44 : | rp@ handler ! | ||
| 45 : | backtrace-empty on | ||
| 46 : | anton | 1.5 | >r ; |
| 47 : | anton | 1.1 | |
| 48 : | : try ( compilation -- orig ; run-time -- ) \ gforth | ||
| 49 : | anton | 1.5 | \ !! does not work correctly for gforth-native |
| 50 : | POSTPONE lit >mark POSTPONE (try) ; immediate compile-only | ||
| 51 : | anton | 1.1 | |
| 52 : | : (recover) ( -- ) | ||
| 53 : | \ normal end of try block: restore handler, forget rest | ||
| 54 : | r> | ||
| 55 : | r> handler ! | ||
| 56 : | rdrop \ lp | ||
| 57 : | rdrop \ fp | ||
| 58 : | rdrop \ sp | ||
| 59 : | r> rp! | ||
| 60 : | rdrop \ recovery address | ||
| 61 : | >r ; | ||
| 62 : | |||
| 63 : | : recover ( compilation orig1 -- orig2 ; run-time -- ) \ gforth | ||
| 64 : | \ !! check using a special tag | ||
| 65 : | POSTPONE (recover) | ||
| 66 : | POSTPONE else ; immediate compile-only | ||
| 67 : | |||
| 68 : | : endtry ( compilation orig -- ; run-time -- ) \ gforth | ||
| 69 : | POSTPONE then ; immediate compile-only | ||
| 70 : | |||
| 71 : | :noname ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error ) \ exception | ||
| 72 : | try | ||
| 73 : | execute 0 | ||
| 74 : | recover | ||
| 75 : | nip | ||
| 76 : | endtry ; | ||
| 77 : | is catch | ||
| 78 : | |||
| 79 : | :noname ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception | ||
| 80 : | ?DUP IF | ||
| 81 : | [ here forthstart 9 cells + ! ] | ||
| 82 : | store-backtrace | ||
| 83 : | handler @ ?dup-0=-IF | ||
| 84 : | anton | 1.6 | >stderr cr ." uncaught exception: " .error cr |
| 85 : | anton | 1.1 | 2 (bye) |
| 86 : | anton | 1.6 | \ quit |
| 87 : | anton | 1.1 | THEN |
| 88 : | rp! | ||
| 89 : | r> handler ! | ||
| 90 : | r> lp! | ||
| 91 : | r> fp! | ||
| 92 : | r> swap >r sp! drop r> | ||
| 93 : | rdrop 'throw | ||
| 94 : | THEN ; | ||
| 95 : | is throw | ||
| 96 : |
|
CVS Admin Powered by ViewCVS 1.0-dev |
ViewCVS and CVS Help |