bb6b2dcd |
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 |