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[bpt/emacs.git] / src / bytecode.c
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36f7ba0a
JB		 1/* Execution of byte code produced by bytecomp.el.
2 Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc.
3
4This file is part of GNU Emacs.
5
6GNU Emacs is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 1, or (at your option)
9any later version.
10
11GNU Emacs is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU Emacs; see the file COPYING. If not, write to
18the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19
20hacked on by jwz 17-jun-91
21 o added a compile-time switch to turn on simple sanity checking;
22 o put back the obsolete byte-codes for error-detection;
23 o put back fset, symbol-function, and read-char because I don't
24 see any reason for them to have been removed;
25 o added a new instruction, unbind_all, which I will use for
26 tail-recursion elimination;
27 o made temp_output_buffer_show() be called with the right number
28 of args;
29 o made the new bytecodes be called with args in the right order;
30 o added metering support.
31
32by Hallvard:
33 o added relative jump instructions;
34 o all conditionals now only do QUIT if they jump.
35 */
36
37
38#include "config.h"
39#include "lisp.h"
40#include "buffer.h"
41#include "syntax.h"
42
43/* Define this to enable some minor sanity checking
44 (useful for debugging the byte compiler...)
45 */
46#define BYTE_CODE_SAFE
47
48/* Define this to enable generation of a histogram of byte-op usage.
49 */
50#define BYTE_CODE_METER
51
52\f
53#ifdef BYTE_CODE_METER
54
55Lisp_Object Vbyte_code_meter;
56int byte_metering_on;
57
58# define METER_2(code1,code2) \
59 XFASTINT (XVECTOR (XVECTOR (Vbyte_code_meter)->contents[(code1)]) \
60 ->contents[(code2)])
61
62# define METER_1(code) METER_2 (0,(code))
63
64# define METER_CODE(last_code, this_code) { \
65 if (byte_metering_on) { \
66 if (METER_1 (this_code) != ((1<<VALBITS)-1)) \
67 METER_1 (this_code) ++; \
68 if (last_code && \
69 METER_2 (last_code,this_code) != ((1<<VALBITS)-1)) \
70 METER_2 (last_code,this_code) ++; \
71 } \
72 }
73
74#else /* ! BYTE_CODE_METER */
75
76# define meter_code(last_code, this_code)
77
78#endif
79\f
80
81Lisp_Object Qbytecode;
82
83/* Byte codes: */
84
85#define Bvarref 010
86#define Bvarset 020
87#define Bvarbind 030
88#define Bcall 040
89#define Bunbind 050
90
91#define Bnth 070
92#define Bsymbolp 071
93#define Bconsp 072
94#define Bstringp 073
95#define Blistp 074
96#define Beq 075
97#define Bmemq 076
98#define Bnot 077
99#define Bcar 0100
100#define Bcdr 0101
101#define Bcons 0102
102#define Blist1 0103
103#define Blist2 0104
104#define Blist3 0105
105#define Blist4 0106
106#define Blength 0107
107#define Baref 0110
108#define Baset 0111
109#define Bsymbol_value 0112
110#define Bsymbol_function 0113 /* no longer generated as of v19 */
111#define Bset 0114
112#define Bfset 0115 /* no longer generated as of v19 */
113#define Bget 0116
114#define Bsubstring 0117
115#define Bconcat2 0120
116#define Bconcat3 0121
117#define Bconcat4 0122
118#define Bsub1 0123
119#define Badd1 0124
120#define Beqlsign 0125
121#define Bgtr 0126
122#define Blss 0127
123#define Bleq 0130
124#define Bgeq 0131
125#define Bdiff 0132
126#define Bnegate 0133
127#define Bplus 0134
128#define Bmax 0135
129#define Bmin 0136
130#define Bmult 0137
131
132#define Bpoint 0140
133#define Bmark 0141 /* no longer generated as of v18 */
134#define Bgoto_char 0142
135#define Binsert 0143
136#define Bpoint_max 0144
137#define Bpoint_min 0145
138#define Bchar_after 0146
139#define Bfollowing_char 0147
140#define Bpreceding_char 0150
141#define Bcurrent_column 0151
142#define Bindent_to 0152
143#define Bscan_buffer 0153 /* No longer generated as of v18 */
144#define Beolp 0154
145#define Beobp 0155
146#define Bbolp 0156
147#define Bbobp 0157
148#define Bcurrent_buffer 0160
149#define Bset_buffer 0161
150#define Bread_char 0162
151#define Bset_mark 0163 /* this loser is no longer generated as of v18 */
152#define Binteractive_p 0164 /* Needed since interactive-p takes unevalled args */
153
154#define Bforward_char 0165
155#define Bforward_word 0166
156#define Bskip_chars_forward 0167
157#define Bskip_chars_backward 0170
158#define Bforward_line 0171
159#define Bchar_syntax 0172
160#define Bbuffer_substring 0173
161#define Bdelete_region 0174
162#define Bnarrow_to_region 0175
163#define Bwiden 0176
164
165#define Bconstant2 0201
166#define Bgoto 0202
167#define Bgotoifnil 0203
168#define Bgotoifnonnil 0204
169#define Bgotoifnilelsepop 0205
170#define Bgotoifnonnilelsepop 0206
171#define Breturn 0207
172#define Bdiscard 0210
173#define Bdup 0211
174
175#define Bsave_excursion 0212
176#define Bsave_window_excursion 0213
177#define Bsave_restriction 0214
178#define Bcatch 0215
179
180#define Bunwind_protect 0216
181#define Bcondition_case 0217
182#define Btemp_output_buffer_setup 0220
183#define Btemp_output_buffer_show 0221
184
185#define Bunbind_all 0222
186
187#define Bstringeqlsign 0230
188#define Bstringlss 0231
189#define Bequal 0232
190#define Bnthcdr 0233
191#define Belt 0234
192#define Bmember 0235
193#define Bassq 0236
194#define Bnreverse 0237
195#define Bsetcar 0240
196#define Bsetcdr 0241
197#define Bcar_safe 0242
198#define Bcdr_safe 0243
199#define Bnconc 0244
200#define Bquo 0245
201#define Brem 0246
202#define Bnumberp 0247
203#define Bintegerp 0250
204
205#define Bconstant 0300
206#define CONSTANTLIM 0100
207\f
208/* Fetch the next byte from the bytecode stream */
209
210#define FETCH *pc++
211
212/* Fetch two bytes from the bytecode stream
213 and make a 16-bit number out of them */
214
215#define FETCH2 (op = FETCH, op + (FETCH << 8))
216
217/* Push x onto the execution stack. */
218
219/* This used to be #define PUSH(x) (*++stackp = (x))
220 This oddity is necessary because Alliant can't be bothered to
221 compile the preincrement operator properly, as of 4/91. -JimB */
222#define PUSH(x) (stackp++, *stackp = (x))
223
224/* Pop a value off the execution stack. */
225
226#define POP (*stackp--)
227
228/* Discard n values from the execution stack. */
229
230#define DISCARD(n) (stackp -= (n))
231
232/* Get the value which is at the top of the execution stack, but don't pop it. */
233
234#define TOP (*stackp)
235
236DEFUN ("byte-code", Fbyte_code, Sbyte_code, 3, 3, 0,
237 "Function used internally in byte-compiled code.\n\
238The first argument is a string of byte code; the second, a vector of constants;\n\
239the third, the maximum stack depth used in this function.\n\
240If the third argument is incorrect, Emacs may crash.")
241 (bytestr, vector, maxdepth)
242 Lisp_Object bytestr, vector, maxdepth;
243{
244 struct gcpro gcpro1, gcpro2, gcpro3;
245 int count = specpdl_ptr - specpdl;
246#ifdef BYTE_CODE_METER
247 int this_op = 0;
248 int prev_op;
249#endif
250 register int op;
251 unsigned char *pc;
252 Lisp_Object *stack;
253 register Lisp_Object *stackp;
254 Lisp_Object *stacke;
255 register Lisp_Object v1, v2;
256 register Lisp_Object *vectorp = XVECTOR (vector)->contents;
257#ifdef BYTE_CODE_SAFE
258 register int const_length = XVECTOR (vector)->size;
259#endif
260 /* Copy of BYTESTR, saved so we can tell if BYTESTR was relocated. */
261 Lisp_Object string_saved;
262 /* Cached address of beginning of string,
263 valid if BYTESTR equals STRING_SAVED. */
264 register unsigned char *strbeg;
265
266 CHECK_STRING (bytestr, 0);
267 if (XTYPE (vector) != Lisp_Vector)
268 vector = wrong_type_argument (Qvectorp, vector);
269 CHECK_NUMBER (maxdepth, 2);
270
271 stackp = (Lisp_Object *) alloca (XFASTINT (maxdepth) * sizeof (Lisp_Object));
272 bzero (stackp, XFASTINT (maxdepth) * sizeof (Lisp_Object));
273 GCPRO3 (bytestr, vector, *stackp);
274 gcpro3.nvars = XFASTINT (maxdepth);
275
276 --stackp;
277 stack = stackp;
278 stacke = stackp + XFASTINT (maxdepth);
279
280 /* Initialize the saved pc-pointer for fetching from the string. */
281 string_saved = bytestr;
282 pc = XSTRING (string_saved)->data;
283
284 while (1)
285 {
286#ifdef BYTE_CODE_SAFE
287 if (stackp > stacke)
288 error (
289 "Stack overflow in byte code (byte compiler bug), pc = %d, depth = %d",
290 pc - XSTRING (string_saved)->data, stacke - stackp);
291 if (stackp < stack)
292 error ("Stack underflow in byte code (byte compiler bug), pc = %d",
293 pc - XSTRING (string_saved)->data);
294#endif
295
296 if (string_saved != bytestr)
297 {
298 pc = pc - XSTRING (string_saved)->data + XSTRING (bytestr)->data;
299 string_saved = bytestr;
300 }
301
302#ifdef BYTE_CODE_METER
303 prev_op = this_op;
304 this_op = op = FETCH;
305 METER_CODE (prev_op, op);
306 switch (op)
307#else
308 switch (op = FETCH)
309#endif
310 {
311 case Bvarref+6:
312 op = FETCH;
313 goto varref;
314
315 case Bvarref+7:
316 op = FETCH2;
317 goto varref;
318
319 case Bvarref: case Bvarref+1: case Bvarref+2: case Bvarref+3:
320 case Bvarref+4: case Bvarref+5:
321 op = op - Bvarref;
322 varref:
323 v1 = vectorp[op];
324 if (XTYPE (v1) != Lisp_Symbol)
325 v2 = Fsymbol_value (v1);
326 else
327 {
328 v2 = XSYMBOL (v1)->value;
329#ifdef SWITCH_ENUM_BUG
330 switch ((int) XTYPE (v2))
331#else
332 switch (XTYPE (v2))
333#endif
334 {
335 case Lisp_Symbol:
336 if (!EQ (v2, Qunbound))
337 break;
338 case Lisp_Intfwd:
339 case Lisp_Boolfwd:
340 case Lisp_Objfwd:
341 case Lisp_Buffer_Local_Value:
342 case Lisp_Some_Buffer_Local_Value:
343 case Lisp_Buffer_Objfwd:
344 case Lisp_Void:
345 v2 = Fsymbol_value (v1);
346 }
347 }
348 PUSH (v2);
349 break;
350
351 case Bvarset+6:
352 op = FETCH;
353 goto varset;
354
355 case Bvarset+7:
356 op = FETCH2;
357 goto varset;
358
359 case Bvarset: case Bvarset+1: case Bvarset+2: case Bvarset+3:
360 case Bvarset+4: case Bvarset+5:
361 op -= Bvarset;
362 varset:
363 Fset (vectorp[op], POP);
364 break;
365
366 case Bvarbind+6:
367 op = FETCH;
368 goto varbind;
369
370 case Bvarbind+7:
371 op = FETCH2;
372 goto varbind;
373
374 case Bvarbind: case Bvarbind+1: case Bvarbind+2: case Bvarbind+3:
375 case Bvarbind+4: case Bvarbind+5:
376 op -= Bvarbind;
377 varbind:
378 specbind (vectorp[op], POP);
379 break;
380
381 case Bcall+6:
382 op = FETCH;
383 goto docall;
384
385 case Bcall+7:
386 op = FETCH2;
387 goto docall;
388
389 case Bcall: case Bcall+1: case Bcall+2: case Bcall+3:
390 case Bcall+4: case Bcall+5:
391 op -= Bcall;
392 docall:
393 DISCARD(op);
394 TOP = Ffuncall (op + 1, &TOP);
395 break;
396
397 case Bunbind+6:
398 op = FETCH;
399 goto dounbind;
400
401 case Bunbind+7:
402 op = FETCH2;
403 goto dounbind;
404
405 case Bunbind: case Bunbind+1: case Bunbind+2: case Bunbind+3:
406 case Bunbind+4: case Bunbind+5:
407 op -= Bunbind;
408 dounbind:
409 unbind_to (specpdl_ptr - specpdl - op, Qnil);
410 break;
411
412 case Bunbind_all:
413 /* To unbind back to the beginning of this frame. Not used yet,
414 but wil be needed for tail-recursion elimination.
415 */
416 unbind_to (count, Qnil);
417 break;
418
419 case Bgoto:
420 QUIT;
421 op = FETCH2; /* pc = FETCH2 loses since FETCH2 contains pc++ */
422 pc = XSTRING (string_saved)->data + op;
423 break;
424
425 case Bgotoifnil:
426 op = FETCH2;
427 if (NULL (POP))
428 {
429 QUIT;
430 pc = XSTRING (string_saved)->data + op;
431 }
432 break;
433
434 case Bgotoifnonnil:
435 op = FETCH2;
436 if (!NULL (POP))
437 {
438 QUIT;
439 pc = XSTRING (string_saved)->data + op;
440 }
441 break;
442
443 case Bgotoifnilelsepop:
444 op = FETCH2;
445 if (NULL (TOP))
446 {
447 QUIT;
448 pc = XSTRING (string_saved)->data + op;
449 }
450 else DISCARD(1);
451 break;
452
453 case Bgotoifnonnilelsepop:
454 op = FETCH2;
455 if (!NULL (TOP))
456 {
457 QUIT;
458 pc = XSTRING (string_saved)->data + op;
459 }
460 else DISCARD(1);
461 break;
462
463 case Breturn:
464 v1 = POP;
465 goto exit;
466
467 case Bdiscard:
468 DISCARD(1);
469 break;
470
471 case Bdup:
472 v1 = TOP;
473 PUSH (v1);
474 break;
475
476 case Bconstant2:
477 PUSH (vectorp[FETCH2]);
478 break;
479
480 case Bsave_excursion:
481 record_unwind_protect (save_excursion_restore, save_excursion_save ());
482 break;
483
484 case Bsave_window_excursion:
485 TOP = Fsave_window_excursion (TOP);
486 break;
487
488 case Bsave_restriction:
489 record_unwind_protect (save_restriction_restore, save_restriction_save ());
490 break;
491
492 case Bcatch:
493 v1 = POP;
494 TOP = internal_catch (TOP, Feval, v1);
495 break;
496
497 case Bunwind_protect:
498 record_unwind_protect (0, POP);
499 (specpdl_ptr - 1)->symbol = Qnil;
500 break;
501
502 case Bcondition_case:
503 v1 = POP;
504 v1 = Fcons (POP, v1);
505 TOP = Fcondition_case (Fcons (TOP, v1));
506 break;
507
508 case Btemp_output_buffer_setup:
509 temp_output_buffer_setup (XSTRING (TOP)->data);
510 TOP = Vstandard_output;
511 break;
512
513 case Btemp_output_buffer_show:
514 v1 = POP;
515 temp_output_buffer_show (TOP, Qnil);
516 TOP = v1;
517 /* pop binding of standard-output */
518 unbind_to (specpdl_ptr - specpdl - 1, Qnil);
519 break;
520
521 case Bnth:
522 v1 = POP;
523 v2 = TOP;
524 nth_entry:
525 CHECK_NUMBER (v2, 0);
526 op = XINT (v2);
527 immediate_quit = 1;
528 while (--op >= 0)
529 {
530 if (CONSP (v1))
531 v1 = XCONS (v1)->cdr;
532 else if (!NULL (v1))
533 {
534 immediate_quit = 0;
535 v1 = wrong_type_argument (Qlistp, v1);
536 immediate_quit = 1;
537 op++;
538 }
539 }
540 immediate_quit = 0;
541 goto docar;
542
543 case Bsymbolp:
544 TOP = XTYPE (TOP) == Lisp_Symbol ? Qt : Qnil;
545 break;
546
547 case Bconsp:
548 TOP = CONSP (TOP) ? Qt : Qnil;
549 break;
550
551 case Bstringp:
552 TOP = XTYPE (TOP) == Lisp_String ? Qt : Qnil;
553 break;
554
555 case Blistp:
556 TOP = CONSP (TOP) || NULL (TOP) ? Qt : Qnil;
557 break;
558
559 case Beq:
560 v1 = POP;
561 TOP = EQ (v1, TOP) ? Qt : Qnil;
562 break;
563
564 case Bmemq:
565 v1 = POP;
566 TOP = Fmemq (TOP, v1);
567 break;
568
569 case Bnot:
570 TOP = NULL (TOP) ? Qt : Qnil;
571 break;
572
573 case Bcar:
574 v1 = TOP;
575 docar:
576 if (CONSP (v1)) TOP = XCONS (v1)->car;
577 else if (NULL (v1)) TOP = Qnil;
578 else Fcar (wrong_type_argument (Qlistp, v1));
579 break;
580
581 case Bcdr:
582 v1 = TOP;
583 if (CONSP (v1)) TOP = XCONS (v1)->cdr;
584 else if (NULL (v1)) TOP = Qnil;
585 else Fcdr (wrong_type_argument (Qlistp, v1));
586 break;
587
588 case Bcons:
589 v1 = POP;
590 TOP = Fcons (TOP, v1);
591 break;
592
593 case Blist1:
594 TOP = Fcons (TOP, Qnil);
595 break;
596
597 case Blist2:
598 v1 = POP;
599 TOP = Fcons (TOP, Fcons (v1, Qnil));
600 break;
601
602 case Blist3:
603 DISCARD(2);
604 TOP = Flist (3, &TOP);
605 break;
606
607 case Blist4:
608 DISCARD(3);
609 TOP = Flist (4, &TOP);
610 break;
611
612 case Blength:
613 TOP = Flength (TOP);
614 break;
615
616 case Baref:
617 v1 = POP;
618 TOP = Faref (TOP, v1);
619 break;
620
621 case Baset:
622 v2 = POP; v1 = POP;
623 TOP = Faset (TOP, v1, v2);
624 break;
625
626 case Bsymbol_value:
627 TOP = Fsymbol_value (TOP);
628 break;
629
630 case Bsymbol_function:
631 TOP = Fsymbol_function (TOP);
632 break;
633
634 case Bset:
635 v1 = POP;
636 TOP = Fset (TOP, v1);
637 break;
638
639 case Bfset:
640 v1 = POP;
641 TOP = Ffset (TOP, v1);
642 break;
643
644 case Bget:
645 v1 = POP;
646 TOP = Fget (TOP, v1);
647 break;
648
649 case Bsubstring:
650 v2 = POP; v1 = POP;
651 TOP = Fsubstring (TOP, v1, v2);
652 break;
653
654 case Bconcat2:
655 DISCARD(1);
656 TOP = Fconcat (2, &TOP);
657 break;
658
659 case Bconcat3:
660 DISCARD(2);
661 TOP = Fconcat (3, &TOP);
662 break;
663
664 case Bconcat4:
665 DISCARD(3);
666 TOP = Fconcat (4, &TOP);
667 break;
668
669 case Bsub1:
670 v1 = TOP;
671 if (XTYPE (v1) == Lisp_Int)
672 {
673 XSETINT (v1, XINT (v1) - 1);
674 TOP = v1;
675 }
676 else
677 TOP = Fsub1 (v1);
678 break;
679
680 case Badd1:
681 v1 = TOP;
682 if (XTYPE (v1) == Lisp_Int)
683 {
684 XSETINT (v1, XINT (v1) + 1);
685 TOP = v1;
686 }
687 else
688 TOP = Fadd1 (v1);
689 break;
690
691 case Beqlsign:
692 v2 = POP; v1 = TOP;
693 CHECK_NUMBER_OR_FLOAT_COERCE_MARKER (v1, 0);
694 CHECK_NUMBER_OR_FLOAT_COERCE_MARKER (v2, 0);
695 TOP = (XFLOATINT (v1) == XFLOATINT (v2)) ? Qt : Qnil;
696 break;
697
698 case Bgtr:
699 v1 = POP;
700 TOP = Fgtr (TOP, v1);
701 break;
702
703 case Blss:
704 v1 = POP;
705 TOP = Flss (TOP, v1);
706 break;
707
708 case Bleq:
709 v1 = POP;
710 TOP = Fleq (TOP, v1);
711 break;
712
713 case Bgeq:
714 v1 = POP;
715 TOP = Fgeq (TOP, v1);
716 break;
717
718 case Bdiff:
719 DISCARD(1);
720 TOP = Fminus (2, &TOP);
721 break;
722
723 case Bnegate:
724 v1 = TOP;
725 if (XTYPE (v1) == Lisp_Int)
726 {
727 XSETINT (v1, - XINT (v1));
728 TOP = v1;
729 }
730 else
731 TOP = Fminus (1, &TOP);
732 break;
733
734 case Bplus:
735 DISCARD(1);
736 TOP = Fplus (2, &TOP);
737 break;
738
739 case Bmax:
740 DISCARD(1);
741 TOP = Fmax (2, &TOP);
742 break;
743
744 case Bmin:
745 DISCARD(1);
746 TOP = Fmin (2, &TOP);
747 break;
748
749 case Bmult:
750 DISCARD(1);
751 TOP = Ftimes (2, &TOP);
752 break;
753
754 case Bquo:
755 DISCARD(1);
756 TOP = Fquo (2, &TOP);
757 break;
758
759 case Brem:
760 v1 = POP;
761 /* This had args in the wrong order. -- jwz */
762 TOP = Frem (TOP, v1);
763 break;
764
765 case Bpoint:
766 XFASTINT (v1) = point;
767 PUSH (v1);
768 break;
769
770 case Bgoto_char:
771 TOP = Fgoto_char (TOP);
772 break;
773
774 case Binsert:
775 TOP = Finsert (1, &TOP);
776 break;
777
778 case Bpoint_max:
779 XFASTINT (v1) = ZV;
780 PUSH (v1);
781 break;
782
783 case Bpoint_min:
784 XFASTINT (v1) = BEGV;
785 PUSH (v1);
786 break;
787
788 case Bchar_after:
789 TOP = Fchar_after (TOP);
790 break;
791
792 case Bfollowing_char:
793 XFASTINT (v1) = PT == ZV ? 0 : FETCH_CHAR (point);
794 PUSH (v1);
795 break;
796
797 case Bpreceding_char:
798 XFASTINT (v1) = point <= BEGV ? 0 : FETCH_CHAR (point - 1);
799 PUSH (v1);
800 break;
801
802 case Bcurrent_column:
803 XFASTINT (v1) = current_column ();
804 PUSH (v1);
805 break;
806
807 case Bindent_to:
808 TOP = Findent_to (TOP, Qnil);
809 break;
810
811 case Beolp:
812 PUSH (Feolp ());
813 break;
814
815 case Beobp:
816 PUSH (Feobp ());
817 break;
818
819 case Bbolp:
820 PUSH (Fbolp ());
821 break;
822
823 case Bbobp:
824 PUSH (Fbobp ());
825 break;
826
827 case Bcurrent_buffer:
828 PUSH (Fcurrent_buffer ());
829 break;
830
831 case Bset_buffer:
832 TOP = Fset_buffer (TOP);
833 break;
834
835 case Bread_char:
836 PUSH (Fread_char ());
837 QUIT;
838 break;
839
840 case Binteractive_p:
841 PUSH (Finteractive_p ());
842 break;
843
844 case Bforward_char:
845 /* This was wrong! --jwz */
846 TOP = Fforward_char (TOP);
847 break;
848
849 case Bforward_word:
850 /* This was wrong! --jwz */
851 TOP = Fforward_word (TOP);
852 break;
853
854 case Bskip_chars_forward:
855 /* This was wrong! --jwz */
856 v1 = POP;
857 TOP = Fskip_chars_forward (TOP, v1);
858 break;
859
860 case Bskip_chars_backward:
861 /* This was wrong! --jwz */
862 v1 = POP;
863 TOP = Fskip_chars_backward (TOP, v1);
864 break;
865
866 case Bforward_line:
867 /* This was wrong! --jwz */
868 TOP = Fforward_line (TOP);
869 break;
870
871 case Bchar_syntax:
872 CHECK_NUMBER (TOP, 0);
873 XFASTINT (TOP) = syntax_code_spec[(int) SYNTAX (0xFF & XINT (TOP))];
874 break;
875
876 case Bbuffer_substring:
877 v1 = POP;
878 TOP = Fbuffer_substring (TOP, v1);
879 break;
880
881 case Bdelete_region:
882 v1 = POP;
883 /* This had args in the wrong order. -- jwz */
884 TOP = Fdelete_region (TOP, v1);
885 break;
886
887 case Bnarrow_to_region:
888 v1 = POP;
889 /* This had args in the wrong order. -- jwz */
890 TOP = Fnarrow_to_region (TOP, v1);
891 break;
892
893 case Bwiden:
894 PUSH (Fwiden ());
895 break;
896
897 case Bstringeqlsign:
898 v1 = POP;
899 /* This had args in the wrong order. -- jwz */
900 TOP = Fstring_equal (TOP, v1);
901 break;
902
903 case Bstringlss:
904 v1 = POP;
905 /* This had args in the wrong order. -- jwz */
906 TOP = Fstring_lessp (TOP, v1);
907 break;
908
909 case Bequal:
910 v1 = POP;
911 /* This had args in the wrong order. -- jwz */
912 TOP = Fequal (TOP, v1);
913 break;
914
915 case Bnthcdr:
916 v1 = POP;
917 /* This had args in the wrong order. -- jwz */
918 TOP = Fnthcdr (TOP, v1);
919 break;
920
921 case Belt:
922 if (XTYPE (TOP) == Lisp_Cons)
923 {
924 /* Exchange args and then do nth. */
925 v2 = POP;
926 v1 = TOP;
927 goto nth_entry;
928 }
929 v1 = POP;
930 TOP = Felt (TOP, v1);
931 break;
932
933 case Bmember:
934 v1 = POP;
935 /* This had args in the wrong order. -- jwz */
936 TOP = Fmember (TOP, v1);
937 break;
938
939 case Bassq:
940 v1 = POP;
941 /* This had args in the wrong order. -- jwz */
942 TOP = Fassq (TOP, v1);
943 break;
944
945 case Bnreverse:
946 TOP = Fnreverse (TOP);
947 break;
948
949 case Bsetcar:
950 v1 = POP;
951 /* This had args in the wrong order. -- jwz */
952 TOP = Fsetcar (TOP, v1);
953 break;
954
955 case Bsetcdr:
956 v1 = POP;
957 /* This had args in the wrong order. -- jwz */
958 TOP = Fsetcdr (TOP, v1);
959 break;
960
961 case Bcar_safe:
962 v1 = TOP;
963 if (XTYPE (v1) == Lisp_Cons)
964 TOP = XCONS (v1)->car;
965 else
966 TOP = Qnil;
967 break;
968
969 case Bcdr_safe:
970 v1 = TOP;
971 if (XTYPE (v1) == Lisp_Cons)
972 TOP = XCONS (v1)->cdr;
973 else
974 TOP = Qnil;
975 break;
976
977 case Bnconc:
978 DISCARD(1);
979 TOP = Fnconc (2, &TOP);
980 break;
981
982 case Bnumberp:
983 TOP = (XTYPE (TOP) == Lisp_Int || XTYPE (TOP) == Lisp_Float
984 ? Qt : Qnil);
985 break;
986
987 case Bintegerp:
988 TOP = XTYPE (TOP) == Lisp_Int ? Qt : Qnil;
989 break;
990
991#ifdef BYTE_CODE_SAFE
992 case Bset_mark:
993 error ("set-mark is an obsolete bytecode");
994 break;
995 case Bscan_buffer:
996 error ("scan-buffer is an obsolete bytecode");
997 break;
998 case Bmark:
999 error("mark is an obsolete bytecode");
1000 break;
1001#endif
1002
1003 default:
1004#ifdef BYTE_CODE_SAFE
1005 if (op < Bconstant)
1006 error ("unknown bytecode %d (byte compiler bug)", op);
1007 if ((op -= Bconstant) >= const_length)
1008 error ("no constant number %d (byte compiler bug)", op);
1009 PUSH (vectorp[op]);
1010#else
1011 PUSH (vectorp[op - Bconstant]);
1012#endif
1013 }
1014 }
1015
1016 exit:
1017 UNGCPRO;
1018 /* Binds and unbinds are supposed to be compiled balanced. */
1019 if (specpdl_ptr - specpdl != count)
1020#ifdef BYTE_CODE_SAFE
1021 error ("binding stack not balanced (serious byte compiler bug)");
1022#else
1023 abort ();
1024#endif
1025 return v1;
1026}
1027
1028syms_of_bytecode ()
1029{
1030 Qbytecode = intern ("byte-code");
1031 staticpro (&Qbytecode);
1032
1033 defsubr (&Sbyte_code);
1034
1035#ifdef BYTE_CODE_METER
1036
1037 DEFVAR_LISP ("byte-code-meter", &Vbyte_code_meter,
1038 "a vector of vectors which holds a histogram of byte-code usage.");
1039 DEFVAR_BOOL ("byte-metering-on", &byte_metering_on, "");
1040
1041 byte_metering_on = 0;
1042 Vbyte_code_meter = Fmake_vector(make_number(256), make_number(0));
1043
1044 {
1045 int i = 256;
1046 while (i--)
1047 XVECTOR(Vbyte_code_meter)->contents[i] =
1048 Fmake_vector(make_number(256), make_number(0));
1049 }
1050#endif
1051}
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