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3dce804d ILT |
1 | /* macro.c - macro support for gas and gasp |
2 | Copyright (C) 1994, 1995 Free Software Foundation, Inc. | |
3 | ||
4 | Written by Steve and Judy Chamberlain of Cygnus Support, | |
5 | sac@cygnus.com | |
6 | ||
7 | This file is part of GAS, the GNU Assembler. | |
8 | ||
9 | GAS is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2, or (at your option) | |
12 | any later version. | |
13 | ||
14 | GAS is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with GAS; see the file COPYING. If not, write to the Free | |
21 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
22 | 02111-1307, USA. */ | |
23 | ||
24 | #include "config.h" | |
25 | #include <stdio.h> | |
26 | #include <ctype.h> | |
27 | #include "sb.h" | |
28 | #include "hash.h" | |
29 | #include "macro.h" | |
30 | ||
31 | /* The routines in this file handle macro definition and expansion. | |
32 | They are called by both gasp and gas. */ | |
33 | ||
34 | /* Structures used to store macros. | |
35 | ||
36 | Each macro knows its name and included text. It gets built with a | |
37 | list of formal arguments, and also keeps a hash table which points | |
38 | into the list to speed up formal search. Each formal knows its | |
39 | name and its default value. Each time the macro is expanded, the | |
40 | formals get the actual values attatched to them. */ | |
41 | ||
42 | /* describe the formal arguments to a macro */ | |
43 | ||
44 | typedef struct formal_struct | |
45 | { | |
46 | struct formal_struct *next; /* next formal in list */ | |
47 | sb name; /* name of the formal */ | |
48 | sb def; /* the default value */ | |
49 | sb actual; /* the actual argument (changed on each expansion) */ | |
50 | int index; /* the index of the formal 0..formal_count-1 */ | |
51 | } | |
52 | formal_entry; | |
53 | ||
54 | /* Other values found in the index field of a formal_entry. */ | |
55 | #define QUAL_INDEX (-1) | |
56 | #define NARG_INDEX (-2) | |
57 | #define LOCAL_INDEX (-3) | |
58 | ||
59 | /* describe the macro. */ | |
60 | ||
61 | typedef struct macro_struct | |
62 | { | |
63 | sb sub; /* substitution text. */ | |
64 | int formal_count; /* number of formal args. */ | |
65 | formal_entry *formals; /* pointer to list of formal_structs */ | |
66 | struct hash_control *formal_hash; /* hash table of formals. */ | |
67 | } | |
68 | macro_entry; | |
69 | ||
70 | /* Internal functions. */ | |
71 | ||
72 | static int get_token PARAMS ((int, sb *, sb *)); | |
73 | static int getstring PARAMS ((int, sb *, sb *)); | |
74 | static int get_any_string PARAMS ((int, sb *, sb *, int, int)); | |
75 | static int do_formals PARAMS ((macro_entry *, int, sb *)); | |
76 | static int get_apost_token PARAMS ((int, sb *, sb *, int)); | |
77 | static int sub_actual | |
78 | PARAMS ((int, sb *, sb *, struct hash_control *, int, sb *, int)); | |
79 | static const char *macro_expand_body | |
80 | PARAMS ((sb *, sb *, formal_entry *, struct hash_control *, int, int)); | |
81 | static const char *macro_expand PARAMS ((int, sb *, macro_entry *, sb *, int)); | |
82 | ||
83 | #define ISWHITE(x) ((x) == ' ' || (x) == '\t') | |
84 | ||
85 | #define ISSEP(x) \ | |
86 | ((x) == ' ' || (x) == '\t' || (x) == ',' || (x) == '"' || (x) == ';' \ | |
87 | || (x) == '<' || (x) == '>' || (x) == ')' || (x) == '(') | |
88 | ||
89 | #define ISBASE(x) \ | |
90 | ((x) == 'b' || (x) == 'B' \ | |
91 | || (x) == 'q' || (x) == 'Q' \ | |
92 | || (x) == 'h' || (x) == 'H' \ | |
93 | || (x) == 'd' || (x) == 'D') | |
94 | ||
95 | /* The macro hash table. */ | |
96 | ||
97 | static struct hash_control *macro_hash; | |
98 | ||
99 | /* Whether any macros have been defined. */ | |
100 | ||
101 | int macro_defined; | |
102 | ||
103 | /* Whether we are in GASP alternate mode. */ | |
104 | ||
105 | static int macro_alternate; | |
106 | ||
107 | /* Whether we are in MRI mode. */ | |
108 | ||
109 | static int macro_mri; | |
110 | ||
111 | /* Function to use to parse an expression. */ | |
112 | ||
113 | static int (*macro_expr) PARAMS ((const char *, int, sb *, int *)); | |
114 | ||
115 | /* Number of macro expansions that have been done. */ | |
116 | ||
117 | static int macro_number; | |
118 | ||
119 | /* Initialize macro processing. */ | |
120 | ||
121 | void | |
122 | macro_init (alternate, mri, expr) | |
123 | int alternate; | |
124 | int mri; | |
125 | int (*expr) PARAMS ((const char *, int, sb *, int *)); | |
126 | { | |
127 | macro_hash = hash_new (); | |
128 | macro_defined = 0; | |
129 | macro_alternate = alternate; | |
130 | macro_mri = mri; | |
131 | macro_expr = expr; | |
132 | } | |
133 | ||
134 | /* Read input lines till we get to a TO string. | |
135 | Increase nesting depth if we get a FROM string. | |
136 | Put the results into sb at PTR. | |
137 | Add a new input line to an sb using GET_LINE. | |
138 | Return 1 on success, 0 on unexpected EOF. */ | |
139 | ||
140 | int | |
141 | buffer_and_nest (from, to, ptr, get_line) | |
142 | const char *from; | |
143 | const char *to; | |
144 | sb *ptr; | |
145 | int (*get_line) PARAMS ((sb *)); | |
146 | { | |
147 | int from_len = strlen (from); | |
148 | int to_len = strlen (to); | |
149 | int depth = 1; | |
150 | int line_start = ptr->len; | |
151 | ||
152 | int more = get_line (ptr); | |
153 | ||
154 | while (more) | |
155 | { | |
156 | /* Try and find the first pseudo op on the line */ | |
157 | int i = line_start; | |
158 | ||
159 | if (! macro_alternate && ! macro_mri) | |
160 | { | |
161 | /* With normal syntax we can suck what we want till we get | |
162 | to the dot. With the alternate, labels have to start in | |
163 | the first column, since we cant tell what's a label and | |
164 | whats a pseudoop */ | |
165 | ||
166 | /* Skip leading whitespace */ | |
167 | while (i < ptr->len && ISWHITE (ptr->ptr[i])) | |
168 | i++; | |
169 | ||
170 | /* Skip over a label */ | |
171 | while (i < ptr->len | |
172 | && (isalnum ((unsigned char) ptr->ptr[i]) | |
173 | || ptr->ptr[i] == '_' | |
174 | || ptr->ptr[i] == '$')) | |
175 | i++; | |
176 | ||
177 | /* And a colon */ | |
178 | if (i < ptr->len | |
179 | && ptr->ptr[i] == ':') | |
180 | i++; | |
181 | ||
182 | } | |
183 | /* Skip trailing whitespace */ | |
184 | while (i < ptr->len && ISWHITE (ptr->ptr[i])) | |
185 | i++; | |
186 | ||
187 | if (i < ptr->len && (ptr->ptr[i] == '.' | |
188 | || macro_alternate | |
189 | || macro_mri)) | |
190 | { | |
191 | if (ptr->ptr[i] == '.') | |
192 | i++; | |
193 | if (strncasecmp (ptr->ptr + i, from, from_len) == 0) | |
194 | depth++; | |
195 | if (strncasecmp (ptr->ptr + i, to, to_len) == 0) | |
196 | { | |
197 | depth--; | |
198 | if (depth == 0) | |
199 | { | |
200 | /* Reset the string to not include the ending rune */ | |
201 | ptr->len = line_start; | |
202 | break; | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
207 | /* Add a CR to the end and keep running */ | |
208 | sb_add_char (ptr, '\n'); | |
209 | line_start = ptr->len; | |
210 | more = get_line (ptr); | |
211 | } | |
212 | ||
213 | /* Return 1 on success, 0 on unexpected EOF. */ | |
214 | return depth == 0; | |
215 | } | |
216 | ||
217 | /* Pick up a token. */ | |
218 | ||
219 | static int | |
220 | get_token (idx, in, name) | |
221 | int idx; | |
222 | sb *in; | |
223 | sb *name; | |
224 | { | |
225 | if (idx < in->len | |
226 | && (isalpha ((unsigned char) in->ptr[idx]) | |
227 | || in->ptr[idx] == '_' | |
228 | || in->ptr[idx] == '$')) | |
229 | { | |
230 | sb_add_char (name, in->ptr[idx++]); | |
231 | while (idx < in->len | |
232 | && (isalnum ((unsigned char) in->ptr[idx]) | |
233 | || in->ptr[idx] == '_' | |
234 | || in->ptr[idx] == '$')) | |
235 | { | |
236 | sb_add_char (name, in->ptr[idx++]); | |
237 | } | |
238 | } | |
239 | /* Ignore trailing & */ | |
240 | if (macro_alternate && idx < in->len && in->ptr[idx] == '&') | |
241 | idx++; | |
242 | return idx; | |
243 | } | |
244 | ||
245 | /* Pick up a string. */ | |
246 | ||
247 | static int | |
248 | getstring (idx, in, acc) | |
249 | int idx; | |
250 | sb *in; | |
251 | sb *acc; | |
252 | { | |
253 | idx = sb_skip_white (idx, in); | |
254 | ||
255 | while (idx < in->len | |
256 | && (in->ptr[idx] == '"' | |
257 | || in->ptr[idx] == '<' | |
258 | || (in->ptr[idx] == '\'' && macro_alternate))) | |
259 | { | |
260 | if (in->ptr[idx] == '<') | |
261 | { | |
262 | if (macro_alternate || macro_mri) | |
263 | { | |
264 | int nest = 0; | |
265 | idx++; | |
266 | while ((in->ptr[idx] != '>' || nest) | |
267 | && idx < in->len) | |
268 | { | |
269 | if (in->ptr[idx] == '!') | |
270 | { | |
271 | idx++ ; | |
272 | sb_add_char (acc, in->ptr[idx++]); | |
273 | } | |
274 | else | |
275 | { | |
276 | if (in->ptr[idx] == '>') | |
277 | nest--; | |
278 | if (in->ptr[idx] == '<') | |
279 | nest++; | |
280 | sb_add_char (acc, in->ptr[idx++]); | |
281 | } | |
282 | } | |
283 | idx++; | |
284 | } | |
285 | else | |
286 | { | |
287 | int code; | |
288 | idx++; | |
289 | idx = ((*macro_expr) | |
290 | ("character code in string must be absolute expression", | |
291 | idx, in, &code)); | |
292 | sb_add_char (acc, code); | |
293 | ||
294 | #if 0 | |
295 | if (in->ptr[idx] != '>') | |
296 | ERROR ((stderr, "Missing > for character code.\n")); | |
297 | #endif | |
298 | idx++; | |
299 | } | |
300 | } | |
301 | else if (in->ptr[idx] == '"' || in->ptr[idx] == '\'') | |
302 | { | |
303 | char tchar = in->ptr[idx]; | |
304 | idx++; | |
305 | while (idx < in->len) | |
306 | { | |
307 | if (macro_alternate && in->ptr[idx] == '!') | |
308 | { | |
309 | idx++ ; | |
310 | sb_add_char (acc, in->ptr[idx++]); | |
311 | } | |
312 | else | |
313 | { | |
314 | if (in->ptr[idx] == tchar) | |
315 | { | |
316 | idx++; | |
317 | if (idx >= in->len || in->ptr[idx] != tchar) | |
318 | break; | |
319 | } | |
320 | sb_add_char (acc, in->ptr[idx]); | |
321 | idx++; | |
322 | } | |
323 | } | |
324 | } | |
325 | } | |
326 | ||
327 | return idx; | |
328 | } | |
329 | ||
330 | /* Fetch string from the input stream, | |
331 | rules: | |
332 | 'Bxyx<whitespace> -> return 'Bxyza | |
333 | %<char> -> return string of decimal value of x | |
334 | "<string>" -> return string | |
335 | xyx<whitespace> -> return xyz | |
336 | */ | |
337 | ||
338 | static int | |
339 | get_any_string (idx, in, out, expand, pretend_quoted) | |
340 | int idx; | |
341 | sb *in; | |
342 | sb *out; | |
343 | int expand; | |
344 | int pretend_quoted; | |
345 | { | |
346 | sb_reset (out); | |
347 | idx = sb_skip_white (idx, in); | |
348 | ||
349 | if (idx < in->len) | |
350 | { | |
351 | if (in->len > 2 && in->ptr[idx+1] == '\'' && ISBASE (in->ptr[idx])) | |
352 | { | |
353 | while (!ISSEP (in->ptr[idx])) | |
354 | sb_add_char (out, in->ptr[idx++]); | |
355 | } | |
356 | else if (in->ptr[idx] == '%' | |
357 | && macro_alternate | |
358 | && expand) | |
359 | { | |
360 | int val; | |
361 | char buf[20]; | |
362 | /* Turns the next expression into a string */ | |
363 | idx = (*macro_expr) ("% operator needs absolute expression", | |
364 | idx + 1, | |
365 | in, | |
366 | &val); | |
367 | sprintf(buf, "%d", val); | |
368 | sb_add_string (out, buf); | |
369 | } | |
370 | else if (in->ptr[idx] == '"' | |
371 | || in->ptr[idx] == '<' | |
372 | || (macro_alternate && in->ptr[idx] == '\'')) | |
373 | { | |
374 | if (macro_alternate && expand) | |
375 | { | |
376 | /* Keep the quotes */ | |
377 | sb_add_char (out, '\"'); | |
378 | ||
379 | idx = getstring (idx, in, out); | |
380 | sb_add_char (out, '\"'); | |
381 | } | |
382 | else | |
383 | { | |
384 | idx = getstring (idx, in, out); | |
385 | } | |
386 | } | |
387 | else | |
388 | { | |
389 | while (idx < in->len | |
390 | && (in->ptr[idx] == '"' | |
391 | || in->ptr[idx] == '\'' | |
392 | || pretend_quoted | |
393 | || (in->ptr[idx] != ' ' | |
394 | && in->ptr[idx] != '\t' | |
395 | && in->ptr[idx] != ',' | |
396 | && in->ptr[idx] != '<'))) | |
397 | { | |
398 | if (in->ptr[idx] == '"' | |
399 | || in->ptr[idx] == '\'') | |
400 | { | |
401 | char tchar = in->ptr[idx]; | |
402 | sb_add_char (out, in->ptr[idx++]); | |
403 | while (idx < in->len | |
404 | && in->ptr[idx] != tchar) | |
405 | sb_add_char (out, in->ptr[idx++]); | |
406 | if (idx == in->len) | |
407 | return idx; | |
408 | } | |
409 | sb_add_char (out, in->ptr[idx++]); | |
410 | } | |
411 | } | |
412 | } | |
413 | ||
414 | return idx; | |
415 | } | |
416 | ||
417 | /* Pick up the formal parameters of a macro definition. */ | |
418 | ||
419 | static int | |
420 | do_formals (macro, idx, in) | |
421 | macro_entry *macro; | |
422 | int idx; | |
423 | sb *in; | |
424 | { | |
425 | formal_entry **p = ¯o->formals; | |
426 | ||
427 | macro->formal_count = 0; | |
428 | macro->formal_hash = hash_new (); | |
429 | while (idx < in->len) | |
430 | { | |
431 | formal_entry *formal; | |
432 | ||
433 | formal = (formal_entry *) xmalloc (sizeof (formal_entry)); | |
434 | ||
435 | sb_new (&formal->name); | |
436 | sb_new (&formal->def); | |
437 | sb_new (&formal->actual); | |
438 | ||
439 | idx = sb_skip_white (idx, in); | |
440 | idx = get_token (idx, in, &formal->name); | |
441 | if (formal->name.len == 0) | |
442 | break; | |
443 | idx = sb_skip_white (idx, in); | |
444 | if (formal->name.len) | |
445 | { | |
446 | /* This is a formal */ | |
447 | if (idx < in->len && in->ptr[idx] == '=') | |
448 | { | |
449 | /* Got a default */ | |
450 | idx = get_any_string (idx + 1, in, &formal->def, 1, 0); | |
451 | } | |
452 | } | |
453 | ||
454 | /* Add to macro's hash table */ | |
455 | hash_jam (macro->formal_hash, sb_terminate (&formal->name), formal); | |
456 | ||
457 | formal->index = macro->formal_count; | |
458 | idx = sb_skip_comma (idx, in); | |
459 | macro->formal_count++; | |
460 | *p = formal; | |
461 | p = &formal->next; | |
462 | *p = NULL; | |
463 | } | |
464 | ||
465 | if (macro_mri) | |
466 | { | |
467 | formal_entry *formal; | |
468 | ||
469 | /* Add a special NARG formal, which macro_expand will set to the | |
470 | number of arguments. */ | |
471 | formal = (formal_entry *) xmalloc (sizeof (formal_entry)); | |
472 | ||
473 | sb_new (&formal->name); | |
474 | sb_new (&formal->def); | |
475 | sb_new (&formal->actual); | |
476 | ||
477 | sb_add_string (&formal->name, "NARG"); | |
478 | ||
479 | /* Add to macro's hash table */ | |
480 | hash_jam (macro->formal_hash, "NARG", formal); | |
481 | ||
482 | formal->index = NARG_INDEX; | |
483 | *p = formal; | |
484 | formal->next = NULL; | |
485 | } | |
486 | ||
487 | return idx; | |
488 | } | |
489 | ||
490 | /* Define a new macro. Returns NULL on success, otherwise returns an | |
491 | error message. */ | |
492 | ||
493 | const char * | |
494 | define_macro (idx, in, label, get_line) | |
495 | int idx; | |
496 | sb *in; | |
497 | sb *label; | |
498 | int (*get_line) PARAMS ((sb *)); | |
499 | { | |
500 | macro_entry *macro; | |
501 | sb name; | |
502 | ||
503 | macro = (macro_entry *) xmalloc (sizeof (macro_entry)); | |
504 | sb_new (¯o->sub); | |
505 | sb_new (&name); | |
506 | ||
507 | macro->formal_count = 0; | |
508 | macro->formals = 0; | |
509 | ||
510 | idx = sb_skip_white (idx, in); | |
511 | if (! buffer_and_nest ("MACRO", "ENDM", ¯o->sub, get_line)) | |
512 | return "unexpected end of file in macro definition"; | |
513 | if (label != NULL && label->len != 0) | |
514 | { | |
515 | sb_add_sb (&name, label); | |
516 | if (in->ptr[idx] == '(') | |
517 | { | |
518 | /* It's the label: MACRO (formals,...) sort */ | |
519 | idx = do_formals (macro, idx + 1, in); | |
520 | if (in->ptr[idx] != ')') | |
521 | return "missing ) after formals"; | |
522 | } | |
523 | else | |
524 | { | |
525 | /* It's the label: MACRO formals,... sort */ | |
526 | idx = do_formals (macro, idx, in); | |
527 | } | |
528 | } | |
529 | else | |
530 | { | |
531 | idx = get_token (idx, in, &name); | |
532 | idx = sb_skip_white (idx, in); | |
533 | idx = do_formals (macro, idx, in); | |
534 | } | |
535 | ||
536 | /* and stick it in the macro hash table */ | |
537 | for (idx = 0; idx < name.len; idx++) | |
538 | if (isupper (name.ptr[idx])) | |
539 | name.ptr[idx] = tolower (name.ptr[idx]); | |
540 | hash_jam (macro_hash, sb_terminate (&name), (PTR) macro); | |
541 | ||
542 | macro_defined = 1; | |
543 | ||
544 | return NULL; | |
545 | } | |
546 | ||
547 | /* Scan a token, and then skip KIND. */ | |
548 | ||
549 | static int | |
550 | get_apost_token (idx, in, name, kind) | |
551 | int idx; | |
552 | sb *in; | |
553 | sb *name; | |
554 | int kind; | |
555 | { | |
556 | idx = get_token (idx, in, name); | |
557 | if (idx < in->len && in->ptr[idx] == kind && ! macro_mri) | |
558 | idx++; | |
559 | return idx; | |
560 | } | |
561 | ||
562 | /* Substitute the actual value for a formal parameter. */ | |
563 | ||
564 | static int | |
565 | sub_actual (src, in, t, formal_hash, kind, out, copyifnotthere) | |
566 | int src; | |
567 | sb *in; | |
568 | sb *t; | |
569 | struct hash_control *formal_hash; | |
570 | int kind; | |
571 | sb *out; | |
572 | int copyifnotthere; | |
573 | { | |
574 | formal_entry *ptr; | |
575 | ||
576 | src = get_apost_token (src, in, t, kind); | |
577 | /* See if it's in the macro's hash table */ | |
578 | ptr = (formal_entry *) hash_find (formal_hash, sb_terminate (t)); | |
579 | if (ptr) | |
580 | { | |
581 | if (ptr->actual.len) | |
582 | { | |
583 | sb_add_sb (out, &ptr->actual); | |
584 | } | |
585 | else | |
586 | { | |
587 | sb_add_sb (out, &ptr->def); | |
588 | } | |
589 | } | |
590 | else if (copyifnotthere) | |
591 | { | |
592 | sb_add_sb (out, t); | |
593 | } | |
594 | else | |
595 | { | |
596 | sb_add_char (out, '\\'); | |
597 | sb_add_sb (out, t); | |
598 | } | |
599 | return src; | |
600 | } | |
601 | ||
602 | /* Expand the body of a macro. */ | |
603 | ||
604 | static const char * | |
605 | macro_expand_body (in, out, formals, formal_hash, comment_char, locals) | |
606 | sb *in; | |
607 | sb *out; | |
608 | formal_entry *formals; | |
609 | struct hash_control *formal_hash; | |
610 | int comment_char; | |
611 | int locals; | |
612 | { | |
613 | sb t; | |
614 | int src = 0; | |
615 | int inquote = 0; | |
616 | formal_entry *loclist = NULL; | |
617 | ||
618 | sb_new (&t); | |
619 | ||
620 | while (src < in->len) | |
621 | { | |
622 | if (in->ptr[src] == '&') | |
623 | { | |
624 | sb_reset (&t); | |
625 | if (macro_mri && src + 1 < in->len && in->ptr[src + 1] == '&') | |
626 | { | |
627 | src = sub_actual (src + 2, in, &t, formal_hash, '\'', out, 1); | |
628 | } | |
629 | else | |
630 | { | |
631 | src = sub_actual (src + 1, in, &t, formal_hash, '&', out, 0); | |
632 | } | |
633 | } | |
634 | else if (in->ptr[src] == '\\') | |
635 | { | |
636 | src++; | |
637 | if (in->ptr[src] == comment_char && comment_char != '\0') | |
638 | { | |
639 | /* This is a comment, just drop the rest of the line */ | |
640 | while (src < in->len | |
641 | && in->ptr[src] != '\n') | |
642 | src++; | |
643 | } | |
644 | else if (in->ptr[src] == '(') | |
645 | { | |
646 | /* Sub in till the next ')' literally */ | |
647 | src++; | |
648 | while (src < in->len && in->ptr[src] != ')') | |
649 | { | |
650 | sb_add_char (out, in->ptr[src++]); | |
651 | } | |
652 | if (in->ptr[src] == ')') | |
653 | src++; | |
654 | else | |
655 | return "missplaced )"; | |
656 | } | |
657 | else if (in->ptr[src] == '@') | |
658 | { | |
659 | /* Sub in the macro invocation number */ | |
660 | ||
661 | char buffer[6]; | |
662 | src++; | |
663 | sprintf (buffer, "%05d", macro_number); | |
664 | sb_add_string (out, buffer); | |
665 | } | |
666 | else if (in->ptr[src] == '&') | |
667 | { | |
668 | /* This is a preprocessor variable name, we don't do them | |
669 | here */ | |
670 | sb_add_char (out, '\\'); | |
671 | sb_add_char (out, '&'); | |
672 | src++; | |
673 | } | |
674 | else if (macro_mri | |
675 | && isalnum ((unsigned char) in->ptr[src])) | |
676 | { | |
677 | int ind; | |
678 | formal_entry *f; | |
679 | ||
680 | if (isdigit ((unsigned char) in->ptr[src])) | |
681 | ind = in->ptr[src] - '0'; | |
682 | else if (isupper ((unsigned char) in->ptr[src])) | |
683 | ind = in->ptr[src] - 'A' + 10; | |
684 | else | |
685 | ind = in->ptr[src] - 'a' + 10; | |
686 | ++src; | |
687 | for (f = formals; f != NULL; f = f->next) | |
688 | { | |
689 | if (f->index == ind - 1) | |
690 | { | |
691 | if (f->actual.len != 0) | |
692 | sb_add_sb (out, &f->actual); | |
693 | else | |
694 | sb_add_sb (out, &f->def); | |
695 | break; | |
696 | } | |
697 | } | |
698 | } | |
699 | else | |
700 | { | |
701 | sb_reset (&t); | |
702 | src = sub_actual (src, in, &t, formal_hash, '\'', out, 0); | |
703 | } | |
704 | } | |
705 | else if ((macro_alternate || macro_mri) | |
706 | && (isalpha ((unsigned char) in->ptr[src]) | |
707 | || in->ptr[src] == '_' | |
708 | || in->ptr[src] == '$')) | |
709 | { | |
710 | if (! locals | |
711 | || src + 5 >= in->len | |
712 | || strncasecmp (in->ptr + src, "LOCAL", 5) != 0 | |
713 | || ! ISWHITE (in->ptr[src + 5])) | |
714 | { | |
715 | sb_reset (&t); | |
716 | src = sub_actual (src, in, &t, formal_hash, '\'', out, 1); | |
717 | } | |
718 | else | |
719 | { | |
720 | formal_entry *f; | |
721 | ||
722 | src = sb_skip_white (src + 5, in); | |
723 | while (in->ptr[src] != '\n' && in->ptr[src] != comment_char) | |
724 | { | |
725 | static int loccnt; | |
726 | char buf[20]; | |
727 | const char *err; | |
728 | ||
729 | f = (formal_entry *) xmalloc (sizeof (formal_entry)); | |
730 | sb_new (&f->name); | |
731 | sb_new (&f->def); | |
732 | sb_new (&f->actual); | |
733 | f->index = LOCAL_INDEX; | |
734 | f->next = loclist; | |
735 | loclist = f; | |
736 | ||
737 | src = get_token (src, in, &f->name); | |
738 | ++loccnt; | |
739 | sprintf (buf, "LL%04x", loccnt); | |
740 | sb_add_string (&f->actual, buf); | |
741 | ||
742 | err = hash_jam (formal_hash, sb_terminate (&f->name), f); | |
743 | if (err != NULL) | |
744 | return err; | |
745 | ||
746 | src = sb_skip_comma (src, in); | |
747 | } | |
748 | } | |
749 | } | |
750 | else if (comment_char != '\0' | |
751 | && in->ptr[src] == comment_char | |
752 | && src + 1 < in->len | |
753 | && in->ptr[src + 1] == comment_char | |
754 | && !inquote) | |
755 | { | |
756 | /* Two comment chars in a row cause the rest of the line to | |
757 | be dropped. */ | |
758 | while (src < in->len && in->ptr[src] != '\n') | |
759 | src++; | |
760 | } | |
761 | else if (in->ptr[src] == '"' | |
762 | || (macro_mri && in->ptr[src] == '\'')) | |
763 | { | |
764 | inquote = !inquote; | |
765 | sb_add_char (out, in->ptr[src++]); | |
766 | } | |
767 | else if (macro_mri | |
768 | && in->ptr[src] == '=' | |
769 | && src + 1 < in->len | |
770 | && in->ptr[src + 1] == '=') | |
771 | { | |
772 | formal_entry *ptr; | |
773 | ||
774 | sb_reset (&t); | |
775 | src = get_token (src + 2, in, &t); | |
776 | ptr = (formal_entry *) hash_find (formal_hash, sb_terminate (&t)); | |
777 | if (ptr == NULL) | |
778 | return "macro formal argument does not exist"; | |
779 | else | |
780 | { | |
781 | if (ptr->actual.len) | |
782 | { | |
783 | sb_add_string (out, "-1"); | |
784 | } | |
785 | else | |
786 | { | |
787 | sb_add_char (out, '0'); | |
788 | } | |
789 | } | |
790 | } | |
791 | else | |
792 | { | |
793 | sb_add_char (out, in->ptr[src++]); | |
794 | } | |
795 | } | |
796 | ||
797 | sb_kill (&t); | |
798 | ||
799 | while (loclist != NULL) | |
800 | { | |
801 | formal_entry *f; | |
802 | ||
803 | f = loclist->next; | |
804 | sb_kill (&loclist->name); | |
805 | sb_kill (&loclist->def); | |
806 | sb_kill (&loclist->actual); | |
807 | free (loclist); | |
808 | loclist = f; | |
809 | } | |
810 | ||
811 | return NULL; | |
812 | } | |
813 | ||
814 | /* Assign values to the formal parameters of a macro, and expand the | |
815 | body. */ | |
816 | ||
817 | static const char * | |
818 | macro_expand (idx, in, m, out, comment_char) | |
819 | int idx; | |
820 | sb *in; | |
821 | macro_entry *m; | |
822 | sb *out; | |
823 | int comment_char; | |
824 | { | |
825 | sb t; | |
826 | formal_entry *ptr; | |
827 | formal_entry *f; | |
828 | int is_positional = 0; | |
829 | int is_keyword = 0; | |
830 | int narg = 0; | |
831 | const char *err; | |
832 | ||
833 | sb_new (&t); | |
834 | ||
835 | /* Reset any old value the actuals may have */ | |
836 | for (f = m->formals; f; f = f->next) | |
837 | sb_reset (&f->actual); | |
838 | f = m->formals; | |
839 | while (f != NULL && f->index < 0) | |
840 | f = f->next; | |
841 | ||
842 | if (macro_mri) | |
843 | { | |
844 | /* The macro may be called with an optional qualifier, which may | |
845 | be referred to in the macro body as \0. */ | |
846 | if (idx < in->len && in->ptr[idx] == '.') | |
847 | { | |
848 | formal_entry *n; | |
849 | ||
850 | n = (formal_entry *) xmalloc (sizeof (formal_entry)); | |
851 | sb_new (&n->name); | |
852 | sb_new (&n->def); | |
853 | sb_new (&n->actual); | |
854 | n->index = QUAL_INDEX; | |
855 | ||
856 | n->next = m->formals; | |
857 | m->formals = n; | |
858 | ||
859 | idx = get_any_string (idx + 1, in, &n->actual, 1, 0); | |
860 | } | |
861 | } | |
862 | ||
863 | /* Peel off the actuals and store them away in the hash tables' actuals */ | |
864 | idx = sb_skip_white (idx, in); | |
865 | while (idx < in->len && in->ptr[idx] != comment_char) | |
866 | { | |
867 | int scan; | |
868 | ||
869 | /* Look and see if it's a positional or keyword arg */ | |
870 | scan = idx; | |
871 | while (scan < in->len | |
872 | && !ISSEP (in->ptr[scan]) | |
873 | && (!macro_alternate && in->ptr[scan] != '=')) | |
874 | scan++; | |
875 | if (scan < in->len && !macro_alternate && in->ptr[scan] == '=') | |
876 | { | |
877 | is_keyword = 1; | |
878 | if (is_positional) | |
879 | return "can't mix positional and keyword arguments"; | |
880 | ||
881 | /* This is a keyword arg, fetch the formal name and | |
882 | then the actual stuff */ | |
883 | sb_reset (&t); | |
884 | idx = get_token (idx, in, &t); | |
885 | if (in->ptr[idx] != '=') | |
886 | return "confusion in formal parameters"; | |
887 | ||
888 | /* Lookup the formal in the macro's list */ | |
889 | ptr = (formal_entry *) hash_find (m->formal_hash, sb_terminate (&t)); | |
890 | if (!ptr) | |
891 | return "macro formal argument does not exist"; | |
892 | else | |
893 | { | |
894 | /* Insert this value into the right place */ | |
895 | sb_reset (&ptr->actual); | |
896 | idx = get_any_string (idx + 1, in, &ptr->actual, 0, 0); | |
897 | if (ptr->actual.len > 0) | |
898 | ++narg; | |
899 | } | |
900 | } | |
901 | else | |
902 | { | |
903 | /* This is a positional arg */ | |
904 | is_positional = 1; | |
905 | if (is_keyword) | |
906 | return "can't mix positional and keyword arguments"; | |
907 | ||
908 | if (!f) | |
909 | { | |
910 | formal_entry **pf; | |
911 | int c; | |
912 | ||
913 | if (!macro_mri) | |
914 | return "too many positional arguments"; | |
915 | ||
916 | f = (formal_entry *) xmalloc (sizeof (formal_entry)); | |
917 | sb_new (&f->name); | |
918 | sb_new (&f->def); | |
919 | sb_new (&f->actual); | |
920 | f->next = NULL; | |
921 | ||
922 | c = -1; | |
923 | for (pf = &m->formals; *pf != NULL; pf = &(*pf)->next) | |
924 | if ((*pf)->index >= c) | |
925 | c = (*pf)->index + 1; | |
926 | if (c == -1) | |
927 | c = 0; | |
928 | *pf = f; | |
929 | f->index = c; | |
930 | } | |
931 | ||
932 | sb_reset (&f->actual); | |
933 | idx = get_any_string (idx, in, &f->actual, 1, 0); | |
934 | if (f->actual.len > 0) | |
935 | ++narg; | |
936 | do | |
937 | { | |
938 | f = f->next; | |
939 | } | |
940 | while (f != NULL && f->index < 0); | |
941 | } | |
942 | ||
943 | idx = sb_skip_comma (idx, in); | |
944 | } | |
945 | ||
946 | if (macro_mri) | |
947 | { | |
948 | char buffer[20]; | |
949 | ||
950 | sb_reset (&t); | |
951 | sb_add_string (&t, "NARG"); | |
952 | ptr = (formal_entry *) hash_find (m->formal_hash, sb_terminate (&t)); | |
953 | sb_reset (&ptr->actual); | |
954 | sprintf (buffer, "%d", narg); | |
955 | sb_add_string (&ptr->actual, buffer); | |
956 | } | |
957 | ||
958 | err = macro_expand_body (&m->sub, out, m->formals, m->formal_hash, | |
959 | comment_char, 1); | |
960 | if (err != NULL) | |
961 | return err; | |
962 | ||
963 | /* Discard any unnamed formal arguments. */ | |
964 | if (macro_mri) | |
965 | { | |
966 | formal_entry **pf; | |
967 | ||
968 | pf = &m->formals; | |
969 | while (*pf != NULL) | |
970 | { | |
971 | if ((*pf)->name.len != 0) | |
972 | pf = &(*pf)->next; | |
973 | else | |
974 | { | |
975 | sb_kill (&(*pf)->name); | |
976 | sb_kill (&(*pf)->def); | |
977 | sb_kill (&(*pf)->actual); | |
978 | f = (*pf)->next; | |
979 | free (*pf); | |
980 | *pf = f; | |
981 | } | |
982 | } | |
983 | } | |
984 | ||
985 | sb_kill (&t); | |
986 | macro_number++; | |
987 | ||
988 | return NULL; | |
989 | } | |
990 | ||
991 | /* Check for a macro. If one is found, put the expansion into | |
992 | *EXPAND. COMMENT_CHAR is the comment character--this is used by | |
993 | gasp. Return 1 if a macro is found, 0 otherwise. */ | |
994 | ||
995 | int | |
996 | check_macro (line, expand, comment_char, error) | |
997 | const char *line; | |
998 | sb *expand; | |
999 | int comment_char; | |
1000 | const char **error; | |
1001 | { | |
1002 | const char *s; | |
1003 | char *copy, *cs; | |
1004 | macro_entry *macro; | |
1005 | sb line_sb; | |
1006 | ||
1007 | if (! isalpha ((unsigned char) *line) | |
1008 | && *line != '_' | |
1009 | && *line != '$' | |
1010 | && (! macro_mri || *line != '.')) | |
1011 | return 0; | |
1012 | ||
1013 | s = line + 1; | |
1014 | while (isalnum ((unsigned char) *s) | |
1015 | || *s == '_' | |
1016 | || *s == '$') | |
1017 | ++s; | |
1018 | ||
1019 | copy = (char *) xmalloc (s - line + 1); | |
1020 | memcpy (copy, line, s - line); | |
1021 | copy[s - line] = '\0'; | |
1022 | for (cs = copy; *cs != '\0'; cs++) | |
1023 | if (isupper (*cs)) | |
1024 | *cs = tolower (*cs); | |
1025 | ||
1026 | macro = (macro_entry *) hash_find (macro_hash, copy); | |
1027 | ||
1028 | if (macro == NULL) | |
1029 | return 0; | |
1030 | ||
1031 | /* Wrap the line up in an sb. */ | |
1032 | sb_new (&line_sb); | |
1033 | while (*s != '\0' && *s != '\n' && *s != '\r') | |
1034 | sb_add_char (&line_sb, *s++); | |
1035 | ||
1036 | sb_new (expand); | |
1037 | *error = macro_expand (0, &line_sb, macro, expand, comment_char); | |
1038 | ||
1039 | sb_kill (&line_sb); | |
1040 | ||
1041 | return 1; | |
1042 | } | |
1043 | ||
1044 | /* Handle the MRI IRP and IRPC pseudo-ops. These are handled as a | |
1045 | combined macro definition and execution. This returns NULL on | |
1046 | success, or an error message otherwise. */ | |
1047 | ||
1048 | const char * | |
1049 | expand_irp (irpc, idx, in, out, get_line, comment_char) | |
1050 | int irpc; | |
1051 | int idx; | |
1052 | sb *in; | |
1053 | sb *out; | |
1054 | int (*get_line) PARAMS ((sb *)); | |
1055 | int comment_char; | |
1056 | { | |
1057 | const char *mn; | |
1058 | sb sub; | |
1059 | formal_entry f; | |
1060 | struct hash_control *h; | |
1061 | const char *err; | |
1062 | ||
1063 | if (irpc) | |
1064 | mn = "IRPC"; | |
1065 | else | |
1066 | mn = "IRP"; | |
1067 | ||
1068 | idx = sb_skip_white (idx, in); | |
1069 | ||
1070 | sb_new (&sub); | |
1071 | if (! buffer_and_nest (mn, "ENDR", &sub, get_line)) | |
1072 | return "unexpected end of file in irp or irpc"; | |
1073 | ||
1074 | sb_new (&f.name); | |
1075 | sb_new (&f.def); | |
1076 | sb_new (&f.actual); | |
1077 | ||
1078 | idx = get_token (idx, in, &f.name); | |
1079 | if (f.name.len == 0) | |
1080 | return "missing model parameter"; | |
1081 | ||
1082 | h = hash_new (); | |
1083 | err = hash_jam (h, sb_terminate (&f.name), &f); | |
1084 | if (err != NULL) | |
1085 | return err; | |
1086 | ||
1087 | f.index = 1; | |
1088 | f.next = NULL; | |
1089 | ||
1090 | sb_reset (out); | |
1091 | ||
1092 | idx = sb_skip_comma (idx, in); | |
1093 | if (idx >= in->len || in->ptr[idx] == comment_char) | |
1094 | { | |
1095 | /* Expand once with a null string. */ | |
1096 | err = macro_expand_body (&sub, out, &f, h, comment_char, 0); | |
1097 | if (err != NULL) | |
1098 | return err; | |
1099 | } | |
1100 | else | |
1101 | { | |
1102 | while (idx < in->len && in->ptr[idx] != comment_char) | |
1103 | { | |
1104 | if (!irpc) | |
1105 | idx = get_any_string (idx, in, &f.actual, 1, 0); | |
1106 | else | |
1107 | { | |
1108 | sb_reset (&f.actual); | |
1109 | sb_add_char (&f.actual, in->ptr[idx]); | |
1110 | ++idx; | |
1111 | } | |
1112 | err = macro_expand_body (&sub, out, &f, h, comment_char, 0); | |
1113 | if (err != NULL) | |
1114 | return err; | |
1115 | if (!irpc) | |
1116 | idx = sb_skip_comma (idx, in); | |
1117 | else | |
1118 | idx = sb_skip_white (idx, in); | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | hash_die (h); | |
1123 | sb_kill (&sub); | |
1124 | ||
1125 | return NULL; | |
1126 | } |