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| 1 : | anton | 1.1 | \ backtrace handling |
| 2 : | |||
| 3 : | anton | 1.3 | \ Copyright (C) 1999,2000 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 | 1.4 | \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
| 20 : | anton | 1.1 | |
| 21 : | |||
| 22 : | \ growing buffers that need not be full | ||
| 23 : | |||
| 24 : | struct | ||
| 25 : | cell% 0 * field buffer-descriptor \ addr u | ||
| 26 : | cell% field buffer-length | ||
| 27 : | cell% field buffer-address | ||
| 28 : | cell% field buffer-maxlength \ >=length | ||
| 29 : | end-struct buffer% | ||
| 30 : | |||
| 31 : | : init-buffer ( addr -- ) | ||
| 32 : | buffer% %size erase ; | ||
| 33 : | |||
| 34 : | : adjust-buffer ( u addr -- ) | ||
| 35 : | \G adjust buffer% at addr to length u | ||
| 36 : | \ this may grow the allocated area, but never shrinks it | ||
| 37 : | dup >r buffer-maxlength @ over < | ||
| 38 : | if ( u ) | ||
| 39 : | r@ buffer-address @ over resize throw r@ buffer-address ! | ||
| 40 : | dup r@ buffer-maxlength ! | ||
| 41 : | then | ||
| 42 : | r> buffer-length ! ; | ||
| 43 : | |||
| 44 : | \ backtrace stuff | ||
| 45 : | |||
| 46 : | anton | 1.2 | create backtrace-rs-buffer buffer% %allot \ copy of the return stack at throw |
| 47 : | anton | 1.1 | |
| 48 : | : init-backtrace ( -- ) | ||
| 49 : | backtrace-rs-buffer init-buffer ; | ||
| 50 : | |||
| 51 : | init-backtrace | ||
| 52 : | |||
| 53 : | :noname ( -- ) | ||
| 54 : | DEFERS 'cold | ||
| 55 : | init-backtrace ; | ||
| 56 : | IS 'cold | ||
| 57 : | |||
| 58 : | : backtrace-return-stack ( -- addr u ) | ||
| 59 : | \ addr is the address of top element of return stack (the stack | ||
| 60 : | \ grows downwards), u is the number of aus that interest us on the | ||
| 61 : | \ stack. | ||
| 62 : | rp@ in-return-stack? | ||
| 63 : | if | ||
| 64 : | rp@ [ 2 cells ]L + | ||
| 65 : | else \ throw by signal handler with insufficient information | ||
| 66 : | handler @ cell - \ beyond that we know nothing | ||
| 67 : | then | ||
| 68 : | backtrace-rp0 @ [ 2 cells ]L - over - 0 max ; | ||
| 69 : | |||
| 70 : | :noname ( -- ) | ||
| 71 : | backtrace-empty @ | ||
| 72 : | if | ||
| 73 : | backtrace-return-stack | ||
| 74 : | dup backtrace-rs-buffer adjust-buffer | ||
| 75 : | backtrace-rs-buffer buffer-address @ swap move | ||
| 76 : | backtrace-empty off | ||
| 77 : | then ; | ||
| 78 : | IS store-backtrace | ||
| 79 : | |||
| 80 : | : print-backtrace ( addr1 addr2 -- ) | ||
| 81 : | \G print a backtrace for the return stack addr1..addr2 | ||
| 82 : | cr ." Backtrace:" | ||
| 83 : | swap u+do | ||
| 84 : | cr | ||
| 85 : | i @ dup hex. ( return-addr? ) | ||
| 86 : | cell - dup in-dictionary? over dup aligned = and | ||
| 87 : | if | ||
| 88 : | @ look | ||
| 89 : | if | ||
| 90 : | .name | ||
| 91 : | else | ||
| 92 : | drop | ||
| 93 : | then | ||
| 94 : | else | ||
| 95 : | drop | ||
| 96 : | then | ||
| 97 : | cell +loop ; | ||
| 98 : | |||
| 99 : | :noname ( -- ) | ||
| 100 : | backtrace-rs-buffer 2@ over + print-backtrace ; | ||
| 101 : | IS dobacktrace |
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