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