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| 1 : | anton | 1.1 | \ LOOK.FS xt -> lfa 22may93jaw |
| 2 : | |||
| 3 : | anton | 1.25 | \ Copyright (C) 1995,1996,1997,2000 Free Software Foundation, Inc. |
| 4 : | anton | 1.3 | |
| 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 | 1.15 | \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
| 20 : | anton | 1.3 | |
| 21 : | anton | 1.1 | \ Look checks first if the word is a primitive. If yes then the |
| 22 : | \ vocabulary in the primitive area is beeing searched, meaning | ||
| 23 : | \ creating for each word a xt and comparing it... | ||
| 24 : | |||
| 25 : | \ If a word is no primitive look searches backwards to find the nfa. | ||
| 26 : | \ Problems: A compiled xt via compile, might be created with noname: | ||
| 27 : | \ a noname: leaves now a empty name field | ||
| 28 : | |||
| 29 : | jwilke | 1.16 | require stuff.fs |
| 30 : | require environ.fs | ||
| 31 : | |||
| 32 : | anton | 1.1 | decimal |
| 33 : | |||
| 34 : | jwilke | 1.8 | \ look 17may93jaw |
| 35 : | anton | 1.1 | |
| 36 : | jwilke | 1.8 | \ rename to discover!!! |
| 37 : | anton | 1.1 | |
| 38 : | anton | 1.18 | : xt>threaded ( xt -- x ) |
| 39 : | \G produces the threaded-code cell for the primitive xt | ||
| 40 : | threading-method 0= if | ||
| 41 : | @ | ||
| 42 : | then ; | ||
| 43 : | |||
| 44 : | anton | 1.23 | : search-name ( xt startlfa -- nt|0 ) |
| 45 : | anton | 1.22 | \ look up name of primitive with code at xt |
| 46 : | pazsan | 1.20 | swap |
| 47 : | pazsan | 1.21 | >r false swap |
| 48 : | anton | 1.17 | BEGIN |
| 49 : | @ dup | ||
| 50 : | WHILE | ||
| 51 : | anton | 1.22 | dup name>int |
| 52 : | pazsan | 1.21 | r@ = IF |
| 53 : | anton | 1.17 | nip dup |
| 54 : | THEN | ||
| 55 : | REPEAT | ||
| 56 : | anton | 1.23 | drop rdrop ; |
| 57 : | anton | 1.1 | |
| 58 : | anton | 1.22 | : threaded>xt ( ca -- xt|0 ) |
| 59 : | \G For the code address ca of a primitive, find the xt (or 0). | ||
| 60 : | [IFDEF] decompile-prim | ||
| 61 : | decompile-prim | ||
| 62 : | [THEN] | ||
| 63 : | \ walk through the array of primitive CAs | ||
| 64 : | >r ['] noop begin | ||
| 65 : | dup @ while | ||
| 66 : | dup xt>threaded r@ = if | ||
| 67 : | rdrop exit | ||
| 68 : | endif | ||
| 69 : | cell+ | ||
| 70 : | repeat | ||
| 71 : | drop rdrop 0 ; | ||
| 72 : | jwilke | 1.8 | |
| 73 : | \ !!! nicht optimal! | ||
| 74 : | [IFUNDEF] look | ||
| 75 : | jwilke | 1.9 | has? ec [IF] |
| 76 : | |||
| 77 : | jwilke | 1.10 | has? rom |
| 78 : | jwilke | 1.8 | [IF] |
| 79 : | anton | 1.23 | : prim>name ( xt -- nt|0 ) |
| 80 : | forth-wordlist @ search-name ; | ||
| 81 : | anton | 1.22 | |
| 82 : | anton | 1.23 | : look ( xt -- lfa flag ) |
| 83 : | jwilke | 1.9 | dup [ unlock rom-dictionary area lock ] |
| 84 : | literal literal within | ||
| 85 : | IF | ||
| 86 : | anton | 1.13 | >head-noprim dup ?? <> |
| 87 : | jwilke | 1.9 | ELSE |
| 88 : | anton | 1.23 | prim>name dup 0<> |
| 89 : | jwilke | 1.9 | THEN ; |
| 90 : | [ELSE] | ||
| 91 : | jwilke | 1.8 | : look ( cfa -- lfa flag ) |
| 92 : | anton | 1.13 | >head-noprim dup ??? <> ; |
| 93 : | jwilke | 1.9 | [THEN] |
| 94 : | jwilke | 1.8 | |
| 95 : | [ELSE] | ||
| 96 : | |||
| 97 : | anton | 1.13 | : PrimStart ['] true >head-noprim ; |
| 98 : | jwilke | 1.8 | |
| 99 : | anton | 1.23 | : prim>name ( xt -- nt|0 ) |
| 100 : | PrimStart search-name ; | ||
| 101 : | anton | 1.22 | |
| 102 : | anton | 1.23 | : look ( xt -- lfa flag ) |
| 103 : | anton | 1.12 | dup in-dictionary? |
| 104 : | jwilke | 1.9 | IF |
| 105 : | anton | 1.13 | >head-noprim dup ??? <> |
| 106 : | anton | 1.12 | ELSE |
| 107 : | anton | 1.23 | prim>name dup 0<> |
| 108 : | jwilke | 1.9 | THEN ; |
| 109 : | anton | 1.1 | |
| 110 : | jwilke | 1.8 | [THEN] |
| 111 : | [THEN] | ||
| 112 : | anton | 1.22 | |
| 113 : | anton | 1.23 | : threaded>name ( ca -- nt|0 ) |
| 114 : | anton | 1.22 | threaded>xt prim>name ; |
| 115 : | anton | 1.13 | |
| 116 : | : >head ( cfa -- nt|0 ) \ gforth to-head | ||
| 117 : | \G tries to find the name token nt of the word represented by cfa; | ||
| 118 : | \G returns 0 if it fails. This word is not absolutely reliable, | ||
| 119 : | \G it may give false positives and produce wrong nts. | ||
| 120 : | look and ; | ||
| 121 : | |||
| 122 : | ' >head ALIAS >name \ gforth to-name | ||
| 123 : | \G old name of @code{>head} |
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