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date Mon, 13 Aug 2007 11:10:50 +0200
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1 ;;; ccl.el --- CCL (Code Conversion Language) compiler
2
3 ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
4 ;; Licensed to the Free Software Foundation.
5
6 ;; Keywords: CCL, mule, multilingual, character set, coding-system
7
8 ;; This file is part of X Emacs.
9
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; any later version.
14
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
19
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
24
25 ;; Synched up with: FSF 20.2
26
27 ;;; Commentary:
28
29 ;; CCL (Code Conversion Language) is a simple programming language to
30 ;; be used for various kind of code conversion. CCL program is
31 ;; compiled to CCL code (vector of integers) and executed by CCL
32 ;; interpreter of Emacs.
33 ;;
34 ;; CCL is used for code conversion at process I/O and file I/O for
35 ;; non-standard coding-system. In addition, it is used for
36 ;; calculating a code point of X's font from a character code.
37 ;; However, since CCL is designed as a powerful programming language,
38 ;; it can be used for more generic calculation. For instance,
39 ;; combination of three or more arithmetic operations can be
40 ;; calculated faster than Emacs Lisp.
41 ;;
42 ;; Here's the syntax of CCL program in BNF notation.
43 ;;
44 ;; CCL_PROGRAM :=
45 ;; (BUFFER_MAGNIFICATION
46 ;; CCL_MAIN_BLOCK
47 ;; [ CCL_EOF_BLOCK ])
48 ;;
49 ;; BUFFER_MAGNIFICATION := integer
50 ;; CCL_MAIN_BLOCK := CCL_BLOCK
51 ;; CCL_EOF_BLOCK := CCL_BLOCK
52 ;;
53 ;; CCL_BLOCK :=
54 ;; STATEMENT | (STATEMENT [STATEMENT ...])
55 ;; STATEMENT :=
56 ;; SET | IF | BRANCH | LOOP | REPEAT | BREAK | READ | WRITE | CALL
57 ;;
58 ;; SET :=
59 ;; (REG = EXPRESSION)
60 ;; | (REG ASSIGNMENT_OPERATOR EXPRESSION)
61 ;; | integer
62 ;;
63 ;; EXPRESSION := ARG | (EXPRESSION OPERATOR ARG)
64 ;;
65 ;; IF := (if EXPRESSION CCL_BLOCK CCL_BLOCK)
66 ;; BRANCH := (branch EXPRESSION CCL_BLOCK [CCL_BLOCK ...])
67 ;; LOOP := (loop STATEMENT [STATEMENT ...])
68 ;; BREAK := (break)
69 ;; REPEAT :=
70 ;; (repeat)
71 ;; | (write-repeat [REG | integer | string])
72 ;; | (write-read-repeat REG [integer | ARRAY])
73 ;; READ :=
74 ;; (read REG ...)
75 ;; | (read-if (REG OPERATOR ARG) CCL_BLOCK CCL_BLOCK)
76 ;; | (read-branch REG CCL_BLOCK [CCL_BLOCK ...])
77 ;; WRITE :=
78 ;; (write REG ...)
79 ;; | (write EXPRESSION)
80 ;; | (write integer) | (write string) | (write REG ARRAY)
81 ;; | string
82 ;; CALL := (call ccl-program-name)
83 ;; END := (end)
84 ;;
85 ;; REG := r0 | r1 | r2 | r3 | r4 | r5 | r6 | r7
86 ;; ARG := REG | integer
87 ;; OPERATOR :=
88 ;; + | - | * | / | % | & | '|' | ^ | << | >> | <8 | >8 | //
89 ;; | < | > | == | <= | >= | != | de-sjis | en-sjis
90 ;; ASSIGNMENT_OPERATOR :=
91 ;; += | -= | *= | /= | %= | &= | '|=' | ^= | <<= | >>=
92 ;; ARRAY := '[' interger ... ']'
93
94 ;;; Code:
95
96 (defconst ccl-command-table
97 [if branch loop break repeat write-repeat write-read-repeat
98 read read-if read-branch write call end]
99 "*Vector of CCL commands (symbols).")
100
101 ;; Put a property to each symbol of CCL commands for the compiler.
102 (let (op (i 0) (len (length ccl-command-table)))
103 (while (< i len)
104 (setq op (aref ccl-command-table i))
105 (put op 'ccl-compile-function (intern (format "ccl-compile-%s" op)))
106 (setq i (1+ i))))
107
108 (defconst ccl-code-table
109 [set-register
110 set-short-const
111 set-const
112 set-array
113 jump
114 jump-cond
115 write-register-jump
116 write-register-read-jump
117 write-const-jump
118 write-const-read-jump
119 write-string-jump
120 write-array-read-jump
121 read-jump
122 branch
123 read-register
124 write-expr-const
125 read-branch
126 write-register
127 write-expr-register
128 call
129 write-const-string
130 write-array
131 end
132 set-assign-expr-const
133 set-assign-expr-register
134 set-expr-const
135 set-expr-register
136 jump-cond-expr-const
137 jump-cond-expr-register
138 read-jump-cond-expr-const
139 read-jump-cond-expr-register
140 ]
141 "*Vector of CCL compiled codes (symbols).")
142
143 ;; Put a property to each symbol of CCL codes for the disassembler.
144 (let (code (i 0) (len (length ccl-code-table)))
145 (while (< i len)
146 (setq code (aref ccl-code-table i))
147 (put code 'ccl-code i)
148 (put code 'ccl-dump-function (intern (format "ccl-dump-%s" code)))
149 (setq i (1+ i))))
150
151 (defconst ccl-jump-code-list
152 '(jump jump-cond write-register-jump write-register-read-jump
153 write-const-jump write-const-read-jump write-string-jump
154 write-array-read-jump read-jump))
155
156 ;; Put a property `jump-flag' to each CCL code which execute jump in
157 ;; some way.
158 (let ((l ccl-jump-code-list))
159 (while l
160 (put (car l) 'jump-flag t)
161 (setq l (cdr l))))
162
163 (defconst ccl-register-table
164 [r0 r1 r2 r3 r4 r5 r6 r7]
165 "*Vector of CCL registers (symbols).")
166
167 ;; Put a property to indicate register number to each symbol of CCL.
168 ;; registers.
169 (let (reg (i 0) (len (length ccl-register-table)))
170 (while (< i len)
171 (setq reg (aref ccl-register-table i))
172 (put reg 'ccl-register-number i)
173 (setq i (1+ i))))
174
175 (defconst ccl-arith-table
176 [+ - * / % & | ^ << >> <8 >8 // nil nil nil
177 < > == <= >= != de-sjis en-sjis]
178 "*Vector of CCL arithmetic/logical operators (symbols).")
179
180 ;; Put a property to each symbol of CCL operators for the compiler.
181 (let (arith (i 0) (len (length ccl-arith-table)))
182 (while (< i len)
183 (setq arith (aref ccl-arith-table i))
184 (if arith (put arith 'ccl-arith-code i))
185 (setq i (1+ i))))
186
187 (defconst ccl-assign-arith-table
188 [+= -= *= /= %= &= |= ^= <<= >>= <8= >8= //=]
189 "*Vector of CCL assignment operators (symbols).")
190
191 ;; Put a property to each symbol of CCL assignment operators for the compiler.
192 (let (arith (i 0) (len (length ccl-assign-arith-table)))
193 (while (< i len)
194 (setq arith (aref ccl-assign-arith-table i))
195 (put arith 'ccl-self-arith-code i)
196 (setq i (1+ i))))
197
198 (defvar ccl-program-vector nil
199 "Working vector of CCL codes produced by CCL compiler.")
200 (defvar ccl-current-ic 0
201 "The current index for `ccl-program-vector'.")
202
203 ;; Embed integer DATA in `ccl-program-vector' at `ccl-current-ic' and
204 ;; increment it. If IC is specified, embed DATA at IC.
205 (defun ccl-embed-data (data &optional ic)
206 (let ((val (if (characterp data) (char-int data) data)))
207 (if ic
208 (aset ccl-program-vector ic val)
209 (aset ccl-program-vector ccl-current-ic val)
210 (setq ccl-current-ic (1+ ccl-current-ic)))))
211
212 ;; Embed string STR of length LEN in `ccl-program-vector' at
213 ;; `ccl-current-ic'.
214 (defun ccl-embed-string (len str)
215 (let ((i 0))
216 (while (< i len)
217 (ccl-embed-data (logior (ash (aref str i) 16)
218 (if (< (1+ i) len)
219 (ash (aref str (1+ i)) 8)
220 0)
221 (if (< (+ i 2) len)
222 (aref str (+ i 2))
223 0)))
224 (setq i (+ i 3)))))
225
226 ;; Embed a relative jump address to `ccl-current-ic' in
227 ;; `ccl-program-vector' at IC without altering the other bit field.
228 (defun ccl-embed-current-address (ic)
229 (let ((relative (- ccl-current-ic (1+ ic))))
230 (aset ccl-program-vector ic
231 (logior (aref ccl-program-vector ic) (ash relative 8)))))
232
233 ;; Embed CCL code for the operation OP and arguments REG and DATA in
234 ;; `ccl-program-vector' at `ccl-current-ic' in the following format.
235 ;; |----------------- integer (28-bit) ------------------|
236 ;; |------------ 20-bit ------------|- 3-bit --|- 5-bit -|
237 ;; |------------- DATA -------------|-- REG ---|-- OP ---|
238 ;; If REG2 is specified, embed a code in the following format.
239 ;; |------- 17-bit ------|- 3-bit --|- 3-bit --|- 5-bit -|
240 ;; |-------- DATA -------|-- REG2 --|-- REG ---|-- OP ---|
241
242 ;; If REG is a CCL register symbol (e.g. r0, r1...), the register
243 ;; number is embedded. If OP is one of unconditional jumps, DATA is
244 ;; changed to an relative jump address.
245
246 (defun ccl-embed-code (op reg data &optional reg2)
247 (if (and (> data 0) (get op 'jump-flag))
248 ;; DATA is an absolute jump address. Make it relative to the
249 ;; next of jump code.
250 (setq data (- data (1+ ccl-current-ic))))
251 (let ((code (logior (get op 'ccl-code)
252 (ash
253 (if (symbolp reg) (get reg 'ccl-register-number) reg) 5)
254 (if reg2
255 (logior (ash (get reg2 'ccl-register-number) 8)
256 (ash data 11))
257 (ash data 8)))))
258 (aset ccl-program-vector ccl-current-ic code)
259 (setq ccl-current-ic (1+ ccl-current-ic))))
260
261 ;; Just advance `ccl-current-ic' by INC.
262 (defun ccl-increment-ic (inc)
263 (setq ccl-current-ic (+ ccl-current-ic inc)))
264
265 ;;;###autoload
266 (defun ccl-program-p (obj)
267 "T if OBJECT is a valid CCL compiled code."
268 (and (vectorp obj)
269 (let ((i 0) (len (length obj)) (flag t))
270 (if (> len 1)
271 (progn
272 (while (and flag (< i len))
273 (setq flag (integerp (aref obj i)))
274 (setq i (1+ i)))
275 flag)))))
276
277 ;; If non-nil, index of the start of the current loop.
278 (defvar ccl-loop-head nil)
279 ;; If non-nil, list of absolute addresses of the breaking points of
280 ;; the current loop.
281 (defvar ccl-breaks nil)
282
283 ;;;###autoload
284 (defun ccl-compile (ccl-program)
285 "Return a compiled code of CCL-PROGRAM as a vector of integer."
286 (if (or (null (consp ccl-program))
287 (null (integer-or-char-p (car ccl-program)))
288 (null (listp (car (cdr ccl-program)))))
289 (error "CCL: Invalid CCL program: %s" ccl-program))
290 (if (null (vectorp ccl-program-vector))
291 (setq ccl-program-vector (make-vector 8192 0)))
292 (setq ccl-loop-head nil ccl-breaks nil)
293 (setq ccl-current-ic 0)
294
295 ;; The first element is the buffer magnification.
296 (ccl-embed-data (car ccl-program))
297
298 ;; The second element is the address of the start CCL code for
299 ;; processing end of input buffer (we call it eof-processor). We
300 ;; set it later.
301 (ccl-increment-ic 1)
302
303 ;; Compile the main body of the CCL program.
304 (ccl-compile-1 (car (cdr ccl-program)))
305
306 ;; Embed the address of eof-processor.
307 (ccl-embed-data ccl-current-ic 1)
308
309 ;; Then compile eof-processor.
310 (if (nth 2 ccl-program)
311 (ccl-compile-1 (nth 2 ccl-program)))
312
313 ;; At last, embed termination code.
314 (ccl-embed-code 'end 0 0)
315
316 (let ((vec (make-vector ccl-current-ic 0))
317 (i 0))
318 (while (< i ccl-current-ic)
319 (aset vec i (aref ccl-program-vector i))
320 (setq i (1+ i)))
321 vec))
322
323 ;; Signal syntax error.
324 (defun ccl-syntax-error (cmd)
325 (error "CCL: Syntax error: %s" cmd))
326
327 ;; Check if ARG is a valid CCL register.
328 (defun ccl-check-register (arg cmd)
329 (if (get arg 'ccl-register-number)
330 arg
331 (error "CCL: Invalid register %s in %s." arg cmd)))
332
333 ;; Check if ARG is a valid CCL command.
334 (defun ccl-check-compile-function (arg cmd)
335 (or (get arg 'ccl-compile-function)
336 (error "CCL: Invalid command: %s" cmd)))
337
338 ;; In the following code, most ccl-compile-XXXX functions return t if
339 ;; they end with unconditional jump, else return nil.
340
341 ;; Compile CCL-BLOCK (see the syntax above).
342 (defun ccl-compile-1 (ccl-block)
343 (let (unconditional-jump
344 cmd)
345 (if (or (integer-or-char-p ccl-block)
346 (stringp ccl-block)
347 (and ccl-block (symbolp (car ccl-block))))
348 ;; This block consists of single statement.
349 (setq ccl-block (list ccl-block)))
350
351 ;; Now CCL-BLOCK is a list of statements. Compile them one by
352 ;; one.
353 (while ccl-block
354 (setq cmd (car ccl-block))
355 (setq unconditional-jump
356 (cond ((integer-or-char-p cmd)
357 ;; SET statement for the register 0.
358 (ccl-compile-set (list 'r0 '= cmd)))
359
360 ((stringp cmd)
361 ;; WRITE statement of string argument.
362 (ccl-compile-write-string cmd))
363
364 ((listp cmd)
365 ;; The other statements.
366 (cond ((eq (nth 1 cmd) '=)
367 ;; SET statement of the form `(REG = EXPRESSION)'.
368 (ccl-compile-set cmd))
369
370 ((and (symbolp (nth 1 cmd))
371 (get (nth 1 cmd) 'ccl-self-arith-code))
372 ;; SET statement with an assignment operation.
373 (ccl-compile-self-set cmd))
374
375 (t
376 (funcall (ccl-check-compile-function (car cmd) cmd)
377 cmd))))
378
379 (t
380 (ccl-syntax-error cmd))))
381 (setq ccl-block (cdr ccl-block)))
382 unconditional-jump))
383
384 (defconst ccl-max-short-const (ash 1 19))
385 (defconst ccl-min-short-const (ash -1 19))
386
387 ;; Compile SET statement.
388 (defun ccl-compile-set (cmd)
389 (let ((rrr (ccl-check-register (car cmd) cmd))
390 (right (nth 2 cmd)))
391 (cond ((listp right)
392 ;; CMD has the form `(RRR = (XXX OP YYY))'.
393 (ccl-compile-expression rrr right))
394
395 ((integer-or-char-p right)
396 ;; CMD has the form `(RRR = integer)'.
397 (if (and (<= right ccl-max-short-const)
398 (>= right ccl-min-short-const))
399 (ccl-embed-code 'set-short-const rrr right)
400 (ccl-embed-code 'set-const rrr 0)
401 (ccl-embed-data right)))
402
403 (t
404 ;; CMD has the form `(RRR = rrr [ array ])'.
405 (ccl-check-register right cmd)
406 (let ((ary (nth 3 cmd)))
407 (if (vectorp ary)
408 (let ((i 0) (len (length ary)))
409 (ccl-embed-code 'set-array rrr len right)
410 (while (< i len)
411 (ccl-embed-data (aref ary i))
412 (setq i (1+ i))))
413 (ccl-embed-code 'set-register rrr 0 right))))))
414 nil)
415
416 ;; Compile SET statement with ASSIGNMENT_OPERATOR.
417 (defun ccl-compile-self-set (cmd)
418 (let ((rrr (ccl-check-register (car cmd) cmd))
419 (right (nth 2 cmd)))
420 (if (listp right)
421 ;; CMD has the form `(RRR ASSIGN_OP (XXX OP YYY))', compile
422 ;; the right hand part as `(r7 = (XXX OP YYY))' (note: the
423 ;; register 7 can be used for storing temporary value).
424 (progn
425 (ccl-compile-expression 'r7 right)
426 (setq right 'r7)))
427 ;; Now CMD has the form `(RRR ASSIGN_OP ARG)'. Compile it as
428 ;; `(RRR = (RRR OP ARG))'.
429 (ccl-compile-expression
430 rrr
431 (list rrr (intern (substring (symbol-name (nth 1 cmd)) 0 -1)) right)))
432 nil)
433
434 ;; Compile SET statement of the form `(RRR = EXPR)'.
435 (defun ccl-compile-expression (rrr expr)
436 (let ((left (car expr))
437 (op (get (nth 1 expr) 'ccl-arith-code))
438 (right (nth 2 expr)))
439 (if (listp left)
440 (progn
441 ;; EXPR has the form `((EXPR2 OP2 ARG) OP RIGHT)'. Compile
442 ;; the first term as `(r7 = (EXPR2 OP2 ARG)).'
443 (ccl-compile-expression 'r7 left)
444 (setq left 'r7)))
445
446 ;; Now EXPR has the form (LEFT OP RIGHT).
447 (if (eq rrr left)
448 ;; Compile this SET statement as `(RRR OP= RIGHT)'.
449 (if (integer-or-char-p right)
450 (progn
451 (ccl-embed-code 'set-assign-expr-const rrr (ash op 3) 'r0)
452 (ccl-embed-data right))
453 (ccl-check-register right expr)
454 (ccl-embed-code 'set-assign-expr-register rrr (ash op 3) right))
455
456 ;; Compile this SET statement as `(RRR = (LEFT OP RIGHT))'.
457 (if (integer-or-char-p right)
458 (progn
459 (ccl-embed-code 'set-expr-const rrr (ash op 3) left)
460 (ccl-embed-data right))
461 (ccl-check-register right expr)
462 (ccl-embed-code 'set-expr-register
463 rrr
464 (logior (ash op 3) (get right 'ccl-register-number))
465 left)))))
466
467 ;; Compile WRITE statement with string argument.
468 (defun ccl-compile-write-string (str)
469 (let ((len (length str)))
470 (ccl-embed-code 'write-const-string 1 len)
471 (ccl-embed-string len str))
472 nil)
473
474 ;; Compile IF statement of the form `(if CONDITION TRUE-PART FALSE-PART)'.
475 ;; If READ-FLAG is non-nil, this statement has the form
476 ;; `(read-if (REG OPERATOR ARG) TRUE-PART FALSE-PART)'.
477 (defun ccl-compile-if (cmd &optional read-flag)
478 (if (and (/= (length cmd) 3) (/= (length cmd) 4))
479 (error "CCL: Invalid number of arguments: %s" cmd))
480 (let ((condition (nth 1 cmd))
481 (true-cmds (nth 2 cmd))
482 (false-cmds (nth 3 cmd))
483 jump-cond-address
484 false-ic)
485 (if (and (listp condition)
486 (listp (car condition)))
487 ;; If CONDITION is a nested expression, the inner expression
488 ;; should be compiled at first as SET statement, i.e.:
489 ;; `(if ((X OP2 Y) OP Z) ...)' is compiled into two statements:
490 ;; `(r7 = (X OP2 Y)) (if (r7 OP Z) ...)'.
491 (progn
492 (ccl-compile-expression 'r7 (car condition))
493 (setq condition (cons 'r7 (cdr condition)))
494 (setq cmd (cons (car cmd)
495 (cons condition (cdr (cdr cmd)))))))
496
497 (setq jump-cond-address ccl-current-ic)
498 ;; Compile CONDITION.
499 (if (symbolp condition)
500 ;; CONDITION is a register.
501 (progn
502 (ccl-check-register condition cmd)
503 (ccl-embed-code 'jump-cond condition 0))
504 ;; CONDITION is a simple expression of the form (RRR OP ARG).
505 (let ((rrr (car condition))
506 (op (get (nth 1 condition) 'ccl-arith-code))
507 (arg (nth 2 condition)))
508 (ccl-check-register rrr cmd)
509 (if (integer-or-char-p arg)
510 (progn
511 (ccl-embed-code (if read-flag 'read-jump-cond-expr-const
512 'jump-cond-expr-const)
513 rrr 0)
514 (ccl-embed-data op)
515 (ccl-embed-data arg))
516 (ccl-check-register arg cmd)
517 (ccl-embed-code (if read-flag 'read-jump-cond-expr-register
518 'jump-cond-expr-register)
519 rrr 0)
520 (ccl-embed-data op)
521 (ccl-embed-data (get arg 'ccl-register-number)))))
522
523 ;; Compile TRUE-PART.
524 (let ((unconditional-jump (ccl-compile-1 true-cmds)))
525 (if (null false-cmds)
526 ;; This is the place to jump to if condition is false.
527 (ccl-embed-current-address jump-cond-address)
528 (let (end-true-part-address)
529 (if (not unconditional-jump)
530 (progn
531 ;; If TRUE-PART does not end with unconditional jump, we
532 ;; have to jump to the end of FALSE-PART from here.
533 (setq end-true-part-address ccl-current-ic)
534 (ccl-embed-code 'jump 0 0)))
535 ;; This is the place to jump to if CONDITION is false.
536 (ccl-embed-current-address jump-cond-address)
537 ;; Compile FALSE-PART.
538 (setq unconditional-jump
539 (and (ccl-compile-1 false-cmds) unconditional-jump))
540 (if end-true-part-address
541 ;; This is the place to jump to after the end of TRUE-PART.
542 (ccl-embed-current-address end-true-part-address))))
543 unconditional-jump)))
544
545 ;; Compile BRANCH statement.
546 (defun ccl-compile-branch (cmd)
547 (if (< (length cmd) 3)
548 (error "CCL: Invalid number of arguments: %s" cmd))
549 (ccl-compile-branch-blocks 'branch
550 (ccl-compile-branch-expression (nth 1 cmd) cmd)
551 (cdr (cdr cmd))))
552
553 ;; Compile READ statement of the form `(read-branch EXPR BLOCK0 BLOCK1 ...)'.
554 (defun ccl-compile-read-branch (cmd)
555 (if (< (length cmd) 3)
556 (error "CCL: Invalid number of arguments: %s" cmd))
557 (ccl-compile-branch-blocks 'read-branch
558 (ccl-compile-branch-expression (nth 1 cmd) cmd)
559 (cdr (cdr cmd))))
560
561 ;; Compile EXPRESSION part of BRANCH statement and return register
562 ;; which holds a value of the expression.
563 (defun ccl-compile-branch-expression (expr cmd)
564 (if (listp expr)
565 ;; EXPR has the form `(EXPR2 OP ARG)'. Compile it as SET
566 ;; statement of the form `(r7 = (EXPR2 OP ARG))'.
567 (progn
568 (ccl-compile-expression 'r7 expr)
569 'r7)
570 (ccl-check-register expr cmd)))
571
572 ;; Compile BLOCKs of BRANCH statement. CODE is 'branch or 'read-branch.
573 ;; REG is a register which holds a value of EXPRESSION part. BLOCKs
574 ;; is a list of CCL-BLOCKs.
575 (defun ccl-compile-branch-blocks (code rrr blocks)
576 (let ((branches (length blocks))
577 branch-idx
578 jump-table-head-address
579 empty-block-indexes
580 block-tail-addresses
581 block-unconditional-jump)
582 (ccl-embed-code code rrr branches)
583 (setq jump-table-head-address ccl-current-ic)
584 ;; The size of jump table is the number of blocks plus 1 (for the
585 ;; case RRR is out of range).
586 (ccl-increment-ic (1+ branches))
587 (setq empty-block-indexes (list branches))
588 ;; Compile each block.
589 (setq branch-idx 0)
590 (while blocks
591 (if (null (car blocks))
592 ;; This block is empty.
593 (setq empty-block-indexes (cons branch-idx empty-block-indexes)
594 block-unconditional-jump t)
595 ;; This block is not empty.
596 (ccl-embed-data (- ccl-current-ic jump-table-head-address)
597 (+ jump-table-head-address branch-idx))
598 (setq block-unconditional-jump (ccl-compile-1 (car blocks)))
599 (if (not block-unconditional-jump)
600 (progn
601 ;; Jump address of the end of branches are embedded later.
602 ;; For the moment, just remember where to embed them.
603 (setq block-tail-addresses
604 (cons ccl-current-ic block-tail-addresses))
605 (ccl-embed-code 'jump 0 0))))
606 (setq branch-idx (1+ branch-idx))
607 (setq blocks (cdr blocks)))
608 (if (not block-unconditional-jump)
609 ;; We don't need jump code at the end of the last block.
610 (setq block-tail-addresses (cdr block-tail-addresses)
611 ccl-current-ic (1- ccl-current-ic)))
612 ;; Embed jump address at the tailing jump commands of blocks.
613 (while block-tail-addresses
614 (ccl-embed-current-address (car block-tail-addresses))
615 (setq block-tail-addresses (cdr block-tail-addresses)))
616 ;; For empty blocks, make entries in the jump table point directly here.
617 (while empty-block-indexes
618 (ccl-embed-data (- ccl-current-ic jump-table-head-address)
619 (+ jump-table-head-address (car empty-block-indexes)))
620 (setq empty-block-indexes (cdr empty-block-indexes))))
621 ;; Branch command ends by unconditional jump if RRR is out of range.
622 nil)
623
624 ;; Compile LOOP statement.
625 (defun ccl-compile-loop (cmd)
626 (if (< (length cmd) 2)
627 (error "CCL: Invalid number of arguments: %s" cmd))
628 (let* ((ccl-loop-head ccl-current-ic)
629 (ccl-breaks nil)
630 unconditional-jump)
631 (setq cmd (cdr cmd))
632 (if cmd
633 (progn
634 (setq unconditional-jump t)
635 (while cmd
636 (setq unconditional-jump
637 (and (ccl-compile-1 (car cmd)) unconditional-jump))
638 (setq cmd (cdr cmd)))
639 (if (not ccl-breaks)
640 unconditional-jump
641 ;; Embed jump address for break statements encountered in
642 ;; this loop.
643 (while ccl-breaks
644 (ccl-embed-current-address (car ccl-breaks))
645 (setq ccl-breaks (cdr ccl-breaks))))
646 nil))))
647
648 ;; Compile BREAK statement.
649 (defun ccl-compile-break (cmd)
650 (if (/= (length cmd) 1)
651 (error "CCL: Invalid number of arguments: %s" cmd))
652 (if (null ccl-loop-head)
653 (error "CCL: No outer loop: %s" cmd))
654 (setq ccl-breaks (cons ccl-current-ic ccl-breaks))
655 (ccl-embed-code 'jump 0 0)
656 t)
657
658 ;; Compile REPEAT statement.
659 (defun ccl-compile-repeat (cmd)
660 (if (/= (length cmd) 1)
661 (error "CCL: Invalid number of arguments: %s" cmd))
662 (if (null ccl-loop-head)
663 (error "CCL: No outer loop: %s" cmd))
664 (ccl-embed-code 'jump 0 ccl-loop-head)
665 t)
666
667 ;; Compile WRITE-REPEAT statement.
668 (defun ccl-compile-write-repeat (cmd)
669 (if (/= (length cmd) 2)
670 (error "CCL: Invalid number of arguments: %s" cmd))
671 (if (null ccl-loop-head)
672 (error "CCL: No outer loop: %s" cmd))
673 (let ((arg (nth 1 cmd)))
674 (cond ((integer-or-char-p arg)
675 (ccl-embed-code 'write-const-jump 0 ccl-loop-head)
676 (ccl-embed-data arg))
677 ((stringp arg)
678 (let ((len (length arg))
679 (i 0))
680 (ccl-embed-code 'write-string-jump 0 ccl-loop-head)
681 (ccl-embed-data len)
682 (ccl-embed-string len arg)))
683 (t
684 (ccl-check-register arg cmd)
685 (ccl-embed-code 'write-register-jump arg ccl-loop-head))))
686 t)
687
688 ;; Compile WRITE-READ-REPEAT statement.
689 (defun ccl-compile-write-read-repeat (cmd)
690 (if (or (< (length cmd) 2) (> (length cmd) 3))
691 (error "CCL: Invalid number of arguments: %s" cmd))
692 (if (null ccl-loop-head)
693 (error "CCL: No outer loop: %s" cmd))
694 (let ((rrr (ccl-check-register (nth 1 cmd) cmd))
695 (arg (nth 2 cmd)))
696 (cond ((null arg)
697 (ccl-embed-code 'write-register-read-jump rrr ccl-loop-head))
698 ((integer-or-char-p arg)
699 (ccl-embed-code 'write-const-read-jump rrr arg ccl-loop-head))
700 ((vectorp arg)
701 (let ((len (length arg))
702 (i 0))
703 (ccl-embed-code 'write-array-read-jump rrr ccl-loop-head)
704 (ccl-embed-data len)
705 (while (< i len)
706 (ccl-embed-data (aref arg i))
707 (setq i (1+ i)))))
708 (t
709 (error "CCL: Invalid argument %s: %s" arg cmd)))
710 (ccl-embed-code 'read-jump rrr ccl-loop-head))
711 t)
712
713 ;; Compile READ statement.
714 (defun ccl-compile-read (cmd)
715 (if (< (length cmd) 2)
716 (error "CCL: Invalid number of arguments: %s" cmd))
717 (let* ((args (cdr cmd))
718 (i (1- (length args))))
719 (while args
720 (let ((rrr (ccl-check-register (car args) cmd)))
721 (ccl-embed-code 'read-register rrr i)
722 (setq args (cdr args) i (1- i)))))
723 nil)
724
725 ;; Compile READ-IF statement.
726 (defun ccl-compile-read-if (cmd)
727 (ccl-compile-if cmd 'read))
728
729 ;; Compile WRITE statement.
730 (defun ccl-compile-write (cmd)
731 (if (< (length cmd) 2)
732 (error "CCL: Invalid number of arguments: %s" cmd))
733 (let ((rrr (nth 1 cmd)))
734 (cond ((integer-or-char-p rrr)
735 (ccl-embed-code 'write-const-string 0 rrr))
736 ((stringp rrr)
737 (ccl-compile-write-string rrr))
738 ((and (symbolp rrr) (vectorp (nth 2 cmd)))
739 (ccl-check-register rrr cmd)
740 ;; CMD has the form `(write REG ARRAY)'.
741 (let* ((arg (nth 2 cmd))
742 (len (length arg))
743 (i 0))
744 (ccl-embed-code 'write-array rrr len)
745 (while (< i len)
746 (if (not (integer-or-char-p (aref arg i)))
747 (error "CCL: Invalid argument %s: %s" arg cmd))
748 (ccl-embed-data (aref arg i))
749 (setq i (1+ i)))))
750
751 ((symbolp rrr)
752 ;; CMD has the form `(write REG ...)'.
753 (let* ((args (cdr cmd))
754 (i (1- (length args))))
755 (while args
756 (setq rrr (ccl-check-register (car args) cmd))
757 (ccl-embed-code 'write-register rrr i)
758 (setq args (cdr args) i (1- i)))))
759
760 ((listp rrr)
761 ;; CMD has the form `(write (LEFT OP RIGHT))'.
762 (let ((left (car rrr))
763 (op (get (nth 1 rrr) 'ccl-arith-code))
764 (right (nth 2 rrr)))
765 (if (listp left)
766 (progn
767 ;; RRR has the form `((EXPR OP2 ARG) OP RIGHT)'.
768 ;; Compile the first term as `(r7 = (EXPR OP2 ARG))'.
769 (ccl-compile-expression 'r7 left)
770 (setq left 'r7)))
771 ;; Now RRR has the form `(ARG OP RIGHT)'.
772 (if (integer-or-char-p right)
773 (progn
774 (ccl-embed-code 'write-expr-const 0 (ash op 3) left)
775 (ccl-embed-data right))
776 (ccl-check-register right rrr)
777 (ccl-embed-code 'write-expr-register 0
778 (logior (ash op 3)
779 (get right 'ccl-register-number))))))
780
781 (t
782 (error "CCL: Invalid argument: %s" cmd))))
783 nil)
784
785 ;; Compile CALL statement.
786 (defun ccl-compile-call (cmd)
787 (if (/= (length cmd) 2)
788 (error "CCL: Invalid number of arguments: %s" cmd))
789 (if (not (symbolp (nth 1 cmd)))
790 (error "CCL: Subroutine should be a symbol: %s" cmd))
791 (let* ((name (nth 1 cmd))
792 (idx (get name 'ccl-program-idx)))
793 (if (not idx)
794 (error "CCL: Unknown subroutine name: %s" name))
795 (ccl-embed-code 'call 0 idx))
796 nil)
797
798 ;; Compile END statement.
799 (defun ccl-compile-end (cmd)
800 (if (/= (length cmd) 1)
801 (error "CCL: Invalid number of arguments: %s" cmd))
802 (ccl-embed-code 'end 0 0)
803 t)
804
805 ;;; CCL dump staffs
806
807 ;; To avoid byte-compiler warning.
808 (defvar ccl-code)
809
810 ;;;###autoload
811 (defun ccl-dump (ccl-code)
812 "Disassemble compiled CCL-CODE."
813 (let ((len (length ccl-code))
814 (buffer-mag (aref ccl-code 0)))
815 (cond ((= buffer-mag 0)
816 (insert "Don't output anything.\n"))
817 ((= buffer-mag 1)
818 (insert "Out-buffer must be as large as in-buffer.\n"))
819 (t
820 (insert
821 (format "Out-buffer must be %d times bigger than in-buffer.\n"
822 buffer-mag))))
823 (insert "Main-body:\n")
824 (setq ccl-current-ic 2)
825 (if (> (aref ccl-code 1) 0)
826 (progn
827 (while (< ccl-current-ic (aref ccl-code 1))
828 (ccl-dump-1))
829 (insert "At EOF:\n")))
830 (while (< ccl-current-ic len)
831 (ccl-dump-1))
832 ))
833
834 ;; Return a CCL code in `ccl-code' at `ccl-current-ic'.
835 (defun ccl-get-next-code ()
836 (prog1
837 (aref ccl-code ccl-current-ic)
838 (setq ccl-current-ic (1+ ccl-current-ic))))
839
840 (defun ccl-dump-1 ()
841 (let* ((code (ccl-get-next-code))
842 (cmd (aref ccl-code-table (logand code 31)))
843 (rrr (ash (logand code 255) -5))
844 (cc (ash code -8)))
845 (insert (format "%5d:[%s] " (1- ccl-current-ic) cmd))
846 (funcall (get cmd 'ccl-dump-function) rrr cc)))
847
848 (defun ccl-dump-set-register (rrr cc)
849 (insert (format "r%d = r%d\n" rrr cc)))
850
851 (defun ccl-dump-set-short-const (rrr cc)
852 (insert (format "r%d = %d\n" rrr cc)))
853
854 (defun ccl-dump-set-const (rrr ignore)
855 (insert (format "r%d = %d\n" rrr (ccl-get-next-code))))
856
857 (defun ccl-dump-set-array (rrr cc)
858 (let ((rrr2 (logand cc 7))
859 (len (ash cc -3))
860 (i 0))
861 (insert (format "r%d = array[r%d] of length %d\n\t"
862 rrr rrr2 len))
863 (while (< i len)
864 (insert (format "%d " (ccl-get-next-code)))
865 (setq i (1+ i)))
866 (insert "\n")))
867
868 (defun ccl-dump-jump (ignore cc &optional address)
869 (insert (format "jump to %d(" (+ (or address ccl-current-ic) cc)))
870 (if (>= cc 0)
871 (insert "+"))
872 (insert (format "%d)\n" (1+ cc))))
873
874 (defun ccl-dump-jump-cond (rrr cc)
875 (insert (format "if (r%d == 0), " rrr))
876 (ccl-dump-jump nil cc))
877
878 (defun ccl-dump-write-register-jump (rrr cc)
879 (insert (format "write r%d, " rrr))
880 (ccl-dump-jump nil cc))
881
882 (defun ccl-dump-write-register-read-jump (rrr cc)
883 (insert (format "write r%d, read r%d, " rrr rrr))
884 (ccl-dump-jump nil cc)
885 (ccl-get-next-code) ; Skip dummy READ-JUMP
886 )
887
888 (defun ccl-extract-arith-op (cc)
889 (aref ccl-arith-table (ash cc -6)))
890
891 (defun ccl-dump-write-expr-const (ignore cc)
892 (insert (format "write (r%d %s %d)\n"
893 (logand cc 7)
894 (ccl-extract-arith-op cc)
895 (ccl-get-next-code))))
896
897 (defun ccl-dump-write-expr-register (ignore cc)
898 (insert (format "write (r%d %s r%d)\n"
899 (logand cc 7)
900 (ccl-extract-arith-op cc)
901 (logand (ash cc -3) 7))))
902
903 (defun ccl-dump-insert-char (cc)
904 (cond ((= cc ?\t) (insert " \"^I\""))
905 ((= cc ?\n) (insert " \"^J\""))
906 (t (insert (format " \"%c\"" cc)))))
907
908 (defun ccl-dump-write-const-jump (ignore cc)
909 (let ((address ccl-current-ic))
910 (insert "write char")
911 (ccl-dump-insert-char (ccl-get-next-code))
912 (insert ", ")
913 (ccl-dump-jump nil cc address)))
914
915 (defun ccl-dump-write-const-read-jump (rrr cc)
916 (let ((address ccl-current-ic))
917 (insert "write char")
918 (ccl-dump-insert-char (ccl-get-next-code))
919 (insert (format ", read r%d, " rrr))
920 (ccl-dump-jump cc address)
921 (ccl-get-next-code) ; Skip dummy READ-JUMP
922 ))
923
924 (defun ccl-dump-write-string-jump (ignore cc)
925 (let ((address ccl-current-ic)
926 (len (ccl-get-next-code))
927 (i 0))
928 (insert "write \"")
929 (while (< i len)
930 (let ((code (ccl-get-next-code)))
931 (insert (ash code -16))
932 (if (< (1+ i) len) (insert (logand (ash code -8) 255)))
933 (if (< (+ i 2) len) (insert (logand code 255))))
934 (setq i (+ i 3)))
935 (insert "\", ")
936 (ccl-dump-jump nil cc address)))
937
938 (defun ccl-dump-write-array-read-jump (rrr cc)
939 (let ((address ccl-current-ic)
940 (len (ccl-get-next-code))
941 (i 0))
942 (insert (format "write array[r%d] of length %d,\n\t" rrr len))
943 (while (< i len)
944 (ccl-dump-insert-char (ccl-get-next-code))
945 (setq i (1+ i)))
946 (insert (format "\n\tthen read r%d, " rrr))
947 (ccl-dump-jump nil cc address)
948 (ccl-get-next-code) ; Skip dummy READ-JUMP.
949 ))
950
951 (defun ccl-dump-read-jump (rrr cc)
952 (insert (format "read r%d, " rrr))
953 (ccl-dump-jump nil cc))
954
955 (defun ccl-dump-branch (rrr len)
956 (let ((jump-table-head ccl-current-ic)
957 (i 0))
958 (insert (format "jump to array[r%d] of length %d\n\t" rrr len))
959 (while (<= i len)
960 (insert (format "%d " (+ jump-table-head (ccl-get-next-code))))
961 (setq i (1+ i)))
962 (insert "\n")))
963
964 (defun ccl-dump-read-register (rrr cc)
965 (insert (format "read r%d (%d remaining)\n" rrr cc)))
966
967 (defun ccl-dump-read-branch (rrr len)
968 (insert (format "read r%d, " rrr))
969 (ccl-dump-branch rrr len))
970
971 (defun ccl-dump-write-register (rrr cc)
972 (insert (format "write r%d (%d remaining)\n" rrr cc)))
973
974 (defun ccl-dump-call (ignore cc)
975 (insert (format "call subroutine #%d\n" cc)))
976
977 (defun ccl-dump-write-const-string (rrr cc)
978 (if (= rrr 0)
979 (progn
980 (insert "write char")
981 (ccl-dump-insert-char cc)
982 (newline))
983 (let ((len cc)
984 (i 0))
985 (insert "write \"")
986 (while (< i len)
987 (let ((code (ccl-get-next-code)))
988 (insert (format "%c" (lsh code -16)))
989 (if (< (1+ i) len)
990 (insert (format "%c" (logand (lsh code -8) 255))))
991 (if (< (+ i 2) len)
992 (insert (format "%c" (logand code 255))))
993 (setq i (+ i 3))))
994 (insert "\"\n"))))
995
996 (defun ccl-dump-write-array (rrr cc)
997 (let ((i 0))
998 (insert (format "write array[r%d] of length %d\n\t" rrr cc))
999 (while (< i cc)
1000 (ccl-dump-insert-char (ccl-get-next-code))
1001 (setq i (1+ i)))
1002 (insert "\n")))
1003
1004 (defun ccl-dump-end (&rest ignore)
1005 (insert "end\n"))
1006
1007 (defun ccl-dump-set-assign-expr-const (rrr cc)
1008 (insert (format "r%d %s= %d\n"
1009 rrr
1010 (ccl-extract-arith-op cc)
1011 (ccl-get-next-code))))
1012
1013 (defun ccl-dump-set-assign-expr-register (rrr cc)
1014 (insert (format "r%d %s= r%d\n"
1015 rrr
1016 (ccl-extract-arith-op cc)
1017 (logand cc 7))))
1018
1019 (defun ccl-dump-set-expr-const (rrr cc)
1020 (insert (format "r%d = r%d %s %d\n"
1021 rrr
1022 (logand cc 7)
1023 (ccl-extract-arith-op cc)
1024 (ccl-get-next-code))))
1025
1026 (defun ccl-dump-set-expr-register (rrr cc)
1027 (insert (format "r%d = r%d %s r%d\n"
1028 rrr
1029 (logand cc 7)
1030 (ccl-extract-arith-op cc)
1031 (logand (ash cc -3) 7))))
1032
1033 (defun ccl-dump-jump-cond-expr-const (rrr cc)
1034 (let ((address ccl-current-ic))
1035 (insert (format "if !(r%d %s %d), "
1036 rrr
1037 (aref ccl-arith-table (ccl-get-next-code))
1038 (ccl-get-next-code)))
1039 (ccl-dump-jump nil cc address)))
1040
1041 (defun ccl-dump-jump-cond-expr-register (rrr cc)
1042 (let ((address ccl-current-ic))
1043 (insert (format "if !(r%d %s r%d), "
1044 rrr
1045 (aref ccl-arith-table (ccl-get-next-code))
1046 (ccl-get-next-code)))
1047 (ccl-dump-jump nil cc address)))
1048
1049 (defun ccl-dump-read-jump-cond-expr-const (rrr cc)
1050 (insert (format "read r%d, " rrr))
1051 (ccl-dump-jump-cond-expr-const rrr cc))
1052
1053 (defun ccl-dump-read-jump-cond-expr-register (rrr cc)
1054 (insert (format "read r%d, " rrr))
1055 (ccl-dump-jump-cond-expr-register rrr cc))
1056
1057 (defun ccl-dump-binary (ccl-code)
1058 (let ((len (length ccl-code))
1059 (i 2))
1060 (while (< i len)
1061 (let ((code (aref ccl-code i))
1062 (j 27))
1063 (while (>= j 0)
1064 (insert (if (= (logand code (ash 1 j)) 0) ?0 ?1))
1065 (setq j (1- j)))
1066 (setq code (logand code 31))
1067 (if (< code (length ccl-code-table))
1068 (insert (format ":%s" (aref ccl-code-table code))))
1069 (insert "\n"))
1070 (setq i (1+ i)))))
1071
1072 ;; CCL emulation staffs
1073
1074 ;; Not yet implemented.
1075
1076 ;;;###autoload
1077 (defmacro declare-ccl-program (name)
1078 "Declare NAME as a name of CCL program.
1079
1080 To compile a CCL program which calls another CCL program not yet
1081 defined, it must be declared as a CCL program in advance."
1082 `(put ',name 'ccl-program-idx (register-ccl-program ',name nil)))
1083
1084 ;;;###autoload
1085 (defmacro define-ccl-program (name ccl-program &optional doc)
1086 "Set NAME the compiled code of CCL-PROGRAM.
1087 CCL-PROGRAM is `eval'ed before being handed to the CCL compiler `ccl-compile'.
1088 The compiled code is a vector of integers."
1089 `(let ((prog ,(ccl-compile (eval ccl-program))))
1090 (defconst ,name prog ,doc)
1091 (put ',name 'ccl-program-idx (register-ccl-program ',name prog))
1092 nil))
1093
1094 ;;;###autoload
1095 (defun ccl-execute-with-args (ccl-prog &rest args)
1096 "Execute CCL-PROGRAM with registers initialized by the remaining args.
1097 The return value is a vector of resulting CCL registeres."
1098 (let ((reg (make-vector 8 0))
1099 (i 0))
1100 (while (and args (< i 8))
1101 (if (not (integerp (car args)))
1102 (error "Arguments should be integer"))
1103 (aset reg i (car args))
1104 (setq args (cdr args) i (1+ i)))
1105 (ccl-execute ccl-prog reg)
1106 reg))
1107
1108 (provide 'ccl)
1109
1110 ;; ccl.el ends here