| 1 | \ @(#) see.fth 98/01/26 1.4 |
| 2 | \ SEE ( <name> -- , disassemble pForth word ) |
| 3 | \ |
| 4 | \ Copyright 1996 Phil Burk |
| 5 | |
| 6 | ' file? >code rfence a! |
| 7 | |
| 8 | anew task-see.fth |
| 9 | |
| 10 | : .XT ( xt -- , print execution tokens name ) |
| 11 | >name |
| 12 | dup c@ flag_immediate and |
| 13 | IF |
| 14 | ." POSTPONE " |
| 15 | THEN |
| 16 | id. space |
| 17 | ; |
| 18 | |
| 19 | \ dictionary may be defined as byte code or cell code |
| 20 | 0 constant BYTE_CODE |
| 21 | |
| 22 | BYTE_CODE [IF] |
| 23 | : CODE@ ( addr -- xt , fetch from code space ) C@ ; |
| 24 | 1 constant CODE_CELL |
| 25 | .( BYTE_CODE not implemented) abort |
| 26 | [ELSE] |
| 27 | : CODE@ ( addr -- xt , fetch from code space ) @ ; |
| 28 | CELL constant CODE_CELL |
| 29 | [THEN] |
| 30 | |
| 31 | private{ |
| 32 | |
| 33 | 0 value see_level \ level of conditional imdentation |
| 34 | 0 value see_addr \ address of next token |
| 35 | 0 value see_out |
| 36 | |
| 37 | : SEE.INDENT.BY ( -- n ) |
| 38 | see_level 1+ 1 max 4 * |
| 39 | ; |
| 40 | |
| 41 | : SEE.CR |
| 42 | >newline |
| 43 | see_addr ." ( ".hex ." )" |
| 44 | see.indent.by spaces |
| 45 | 0 -> see_out |
| 46 | ; |
| 47 | : SEE.NEWLINE |
| 48 | see_out 0> |
| 49 | IF see.cr |
| 50 | THEN |
| 51 | ; |
| 52 | : SEE.CR? |
| 53 | see_out 6 > |
| 54 | IF |
| 55 | see.newline |
| 56 | THEN |
| 57 | ; |
| 58 | : SEE.OUT+ |
| 59 | 1 +-> see_out |
| 60 | ; |
| 61 | |
| 62 | : SEE.ADVANCE |
| 63 | code_cell +-> see_addr |
| 64 | ; |
| 65 | : SEE.GET.INLINE ( -- n ) |
| 66 | see_addr @ |
| 67 | ; |
| 68 | |
| 69 | : SEE.GET.TARGET ( -- branch-target-addr ) |
| 70 | see_addr @ see_addr + |
| 71 | ; |
| 72 | |
| 73 | : SEE.SHOW.LIT ( -- ) |
| 74 | see.get.inline . |
| 75 | see.advance |
| 76 | see.out+ |
| 77 | ; |
| 78 | |
| 79 | exists? F* [IF] |
| 80 | : SEE.SHOW.FLIT ( -- ) |
| 81 | see_addr f@ f. |
| 82 | 1 floats +-> see_addr |
| 83 | see.out+ |
| 84 | ; |
| 85 | [THEN] |
| 86 | |
| 87 | : SEE.SHOW.ALIT ( -- ) |
| 88 | see.get.inline >name id. space |
| 89 | see.advance |
| 90 | see.out+ |
| 91 | ; |
| 92 | |
| 93 | : SEE.SHOW.STRING ( -- ) |
| 94 | see_addr count 2dup + aligned -> see_addr type |
| 95 | see.out+ |
| 96 | ; |
| 97 | : SEE.SHOW.TARGET ( -- ) |
| 98 | see.get.target .hex see.advance |
| 99 | ; |
| 100 | |
| 101 | : SEE.BRANCH ( -- addr | , handle branch ) |
| 102 | -1 +-> see_level |
| 103 | see.newline |
| 104 | see.get.inline 0> |
| 105 | IF \ forward branch |
| 106 | ." ELSE " |
| 107 | see.get.target \ calculate address of target |
| 108 | 1 +-> see_level |
| 109 | nip \ remove old address for THEN |
| 110 | ELSE |
| 111 | ." REPEAT " see.get.target .hex |
| 112 | drop \ remove old address for THEN |
| 113 | THEN |
| 114 | see.advance |
| 115 | see.cr |
| 116 | ; |
| 117 | |
| 118 | : SEE.0BRANCH ( -- addr | , handle 0branch ) |
| 119 | see.newline |
| 120 | see.get.inline 0> |
| 121 | IF \ forward branch |
| 122 | ." IF or WHILE " |
| 123 | see.get.target \ calculate adress of target |
| 124 | 1 +-> see_level |
| 125 | ELSE |
| 126 | ." UNTIL=>" see.get.target .hex |
| 127 | THEN |
| 128 | see.advance |
| 129 | see.cr |
| 130 | ; |
| 131 | |
| 132 | : SEE.XT { xt -- } |
| 133 | xt |
| 134 | CASE |
| 135 | 0 OF see_level 0> IF ." EXIT " see.out+ ELSE ." ;" 0 -> see_addr THEN ENDOF |
| 136 | ['] (LITERAL) OF see.show.lit ENDOF |
| 137 | ['] (ALITERAL) OF see.show.alit ENDOF |
| 138 | [ exists? (FLITERAL) [IF] ] |
| 139 | ['] (FLITERAL) OF see.show.flit ENDOF |
| 140 | [ [THEN] ] |
| 141 | ['] BRANCH OF see.branch ENDOF |
| 142 | ['] 0BRANCH OF see.0branch ENDOF |
| 143 | ['] (LOOP) OF -1 +-> see_level see.newline ." LOOP " see.advance see.cr ENDOF |
| 144 | ['] (+LOOP) OF -1 +-> see_level see.newline ." +LOOP" see.advance see.cr ENDOF |
| 145 | ['] (DO) OF see.newline ." DO" 1 +-> see_level see.cr ENDOF |
| 146 | ['] (?DO) OF see.newline ." ?DO " see.advance 1 +-> see_level see.cr ENDOF |
| 147 | ['] (.") OF .' ." ' see.show.string .' " ' ENDOF |
| 148 | ['] (C") OF .' C" ' see.show.string .' " ' ENDOF |
| 149 | ['] (S") OF .' S" ' see.show.string .' " ' ENDOF |
| 150 | |
| 151 | see.cr? xt .xt see.out+ |
| 152 | ENDCASE |
| 153 | ; |
| 154 | |
| 155 | : (SEE) { cfa | xt -- } |
| 156 | 0 -> see_level |
| 157 | cfa -> see_addr |
| 158 | see.cr |
| 159 | 0 \ fake address for THEN handler |
| 160 | BEGIN |
| 161 | see_addr code@ -> xt |
| 162 | BEGIN |
| 163 | dup see_addr ( >newline .s ) = |
| 164 | WHILE |
| 165 | -1 +-> see_level see.newline |
| 166 | ." THEN " see.cr |
| 167 | drop |
| 168 | REPEAT |
| 169 | CODE_CELL +-> see_addr |
| 170 | xt see.xt |
| 171 | see_addr 0= |
| 172 | UNTIL |
| 173 | cr |
| 174 | 0= not abort" SEE conditional analyser nesting failed!" |
| 175 | ; |
| 176 | |
| 177 | }PRIVATE |
| 178 | |
| 179 | : SEE ( <name> -- , disassemble ) |
| 180 | ' |
| 181 | dup ['] FIRST_COLON > |
| 182 | IF |
| 183 | >code (see) |
| 184 | ELSE |
| 185 | >name id. |
| 186 | ." is primitive defined in 'C' kernel." cr |
| 187 | THEN |
| 188 | ; |
| 189 | |
| 190 | PRIVATIZE |
| 191 | |
| 192 | 0 [IF] |
| 193 | |
| 194 | : SEE.JOKE |
| 195 | dup swap drop |
| 196 | ; |
| 197 | |
| 198 | : SEE.IF |
| 199 | IF |
| 200 | ." hello" cr |
| 201 | ELSE |
| 202 | ." bye" cr |
| 203 | THEN |
| 204 | see.joke |
| 205 | ; |
| 206 | : SEE.DO |
| 207 | 4 0 |
| 208 | DO |
| 209 | i . cr |
| 210 | LOOP |
| 211 | ; |
| 212 | : SEE." |
| 213 | ." Here are some strings." cr |
| 214 | c" Forth string." count type cr |
| 215 | s" Addr/Cnt string" type cr |
| 216 | ; |
| 217 | |
| 218 | [THEN] |