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45b966db ZW |
1 | /* CPP Library - lexical analysis. |
2 | Copyright (C) 2000 Free Software Foundation, Inc. | |
3 | Contributed by Per Bothner, 1994-95. | |
4 | Based on CCCP program by Paul Rubin, June 1986 | |
5 | Adapted to ANSI C, Richard Stallman, Jan 1987 | |
6 | Broken out to separate file, Zack Weinberg, Mar 2000 | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by the | |
10 | Free Software Foundation; either version 2, or (at your option) any | |
11 | later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "intl.h" | |
25 | #include "cpplib.h" | |
26 | #include "cpphash.h" | |
27 | ||
ff2b53ef ZW |
28 | #define PEEKBUF(BUFFER, N) \ |
29 | ((BUFFER)->rlimit - (BUFFER)->cur > (N) ? (BUFFER)->cur[N] : EOF) | |
30 | #define GETBUF(BUFFER) \ | |
31 | ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur++ : EOF) | |
32 | #define FORWARDBUF(BUFFER, N) ((BUFFER)->cur += (N)) | |
33 | ||
34 | #define PEEKN(N) PEEKBUF (CPP_BUFFER (pfile), N) | |
35 | #define FORWARD(N) FORWARDBUF (CPP_BUFFER (pfile), (N)) | |
36 | #define GETC() GETBUF (CPP_BUFFER (pfile)) | |
37 | #define PEEKC() PEEKBUF (CPP_BUFFER (pfile), 0) | |
45b966db ZW |
38 | |
39 | static void skip_block_comment PARAMS ((cpp_reader *)); | |
40 | static void skip_line_comment PARAMS ((cpp_reader *)); | |
41 | static int maybe_macroexpand PARAMS ((cpp_reader *, long)); | |
42 | static int skip_comment PARAMS ((cpp_reader *, int)); | |
43 | static int copy_comment PARAMS ((cpp_reader *, int)); | |
44 | static void skip_string PARAMS ((cpp_reader *, int)); | |
45 | static void parse_string PARAMS ((cpp_reader *, int)); | |
46 | static U_CHAR *find_position PARAMS ((U_CHAR *, U_CHAR *, unsigned long *)); | |
47 | static int null_cleanup PARAMS ((cpp_buffer *, cpp_reader *)); | |
64aaf407 | 48 | static void null_warning PARAMS ((cpp_reader *, unsigned int)); |
45b966db ZW |
49 | |
50 | /* Re-allocates PFILE->token_buffer so it will hold at least N more chars. */ | |
51 | ||
52 | void | |
53 | _cpp_grow_token_buffer (pfile, n) | |
54 | cpp_reader *pfile; | |
55 | long n; | |
56 | { | |
57 | long old_written = CPP_WRITTEN (pfile); | |
58 | pfile->token_buffer_size = n + 2 * pfile->token_buffer_size; | |
59 | pfile->token_buffer = (U_CHAR *) | |
60 | xrealloc(pfile->token_buffer, pfile->token_buffer_size); | |
61 | CPP_SET_WRITTEN (pfile, old_written); | |
62 | } | |
63 | ||
64 | static int | |
65 | null_cleanup (pbuf, pfile) | |
66 | cpp_buffer *pbuf ATTRIBUTE_UNUSED; | |
67 | cpp_reader *pfile ATTRIBUTE_UNUSED; | |
68 | { | |
69 | return 0; | |
70 | } | |
71 | ||
72 | /* Allocate a new cpp_buffer for PFILE, and push it on the input buffer stack. | |
73 | If BUFFER != NULL, then use the LENGTH characters in BUFFER | |
74 | as the new input buffer. | |
75 | Return the new buffer, or NULL on failure. */ | |
76 | ||
77 | cpp_buffer * | |
78 | cpp_push_buffer (pfile, buffer, length) | |
79 | cpp_reader *pfile; | |
80 | const U_CHAR *buffer; | |
81 | long length; | |
82 | { | |
83 | cpp_buffer *buf = CPP_BUFFER (pfile); | |
84 | cpp_buffer *new; | |
85 | if (++pfile->buffer_stack_depth == CPP_STACK_MAX) | |
86 | { | |
87 | cpp_fatal (pfile, "macro or `#include' recursion too deep"); | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | new = (cpp_buffer *) xcalloc (1, sizeof (cpp_buffer)); | |
92 | ||
93 | new->if_stack = pfile->if_stack; | |
94 | new->cleanup = null_cleanup; | |
95 | new->buf = new->cur = buffer; | |
ff2b53ef | 96 | new->rlimit = buffer + length; |
45b966db | 97 | new->prev = buf; |
ff2b53ef | 98 | new->mark = NULL; |
45b966db ZW |
99 | new->line_base = NULL; |
100 | ||
101 | CPP_BUFFER (pfile) = new; | |
102 | return new; | |
103 | } | |
104 | ||
105 | cpp_buffer * | |
106 | cpp_pop_buffer (pfile) | |
107 | cpp_reader *pfile; | |
108 | { | |
109 | cpp_buffer *buf = CPP_BUFFER (pfile); | |
110 | if (ACTIVE_MARK_P (pfile)) | |
111 | cpp_ice (pfile, "mark active in cpp_pop_buffer"); | |
112 | (*buf->cleanup) (buf, pfile); | |
113 | CPP_BUFFER (pfile) = CPP_PREV_BUFFER (buf); | |
114 | free (buf); | |
115 | pfile->buffer_stack_depth--; | |
116 | return CPP_BUFFER (pfile); | |
117 | } | |
118 | ||
119 | /* Scan until CPP_BUFFER (PFILE) is exhausted into PFILE->token_buffer. | |
120 | Pop the buffer when done. */ | |
121 | ||
122 | void | |
123 | cpp_scan_buffer (pfile) | |
124 | cpp_reader *pfile; | |
125 | { | |
126 | cpp_buffer *buffer = CPP_BUFFER (pfile); | |
3a2b2c7a | 127 | enum cpp_ttype token; |
ae79697b | 128 | if (CPP_OPTION (pfile, no_output)) |
45b966db ZW |
129 | { |
130 | long old_written = CPP_WRITTEN (pfile); | |
131 | /* In no-output mode, we can ignore everything but directives. */ | |
132 | for (;;) | |
133 | { | |
134 | if (! pfile->only_seen_white) | |
135 | _cpp_skip_rest_of_line (pfile); | |
136 | token = cpp_get_token (pfile); | |
137 | if (token == CPP_EOF) /* Should not happen ... */ | |
138 | break; | |
139 | if (token == CPP_POP && CPP_BUFFER (pfile) == buffer) | |
140 | { | |
141 | if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) != NULL) | |
142 | cpp_pop_buffer (pfile); | |
143 | break; | |
144 | } | |
145 | } | |
146 | CPP_SET_WRITTEN (pfile, old_written); | |
147 | } | |
148 | else | |
149 | { | |
150 | for (;;) | |
151 | { | |
152 | token = cpp_get_token (pfile); | |
153 | if (token == CPP_EOF) /* Should not happen ... */ | |
154 | break; | |
155 | if (token == CPP_POP && CPP_BUFFER (pfile) == buffer) | |
156 | { | |
157 | if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) != NULL) | |
158 | cpp_pop_buffer (pfile); | |
159 | break; | |
160 | } | |
161 | } | |
162 | } | |
163 | } | |
164 | ||
165 | /* | |
166 | * Rescan a string (which may have escape marks) into pfile's buffer. | |
167 | * Place the result in pfile->token_buffer. | |
168 | * | |
169 | * The input is copied before it is scanned, so it is safe to pass | |
170 | * it something from the token_buffer that will get overwritten | |
171 | * (because it follows CPP_WRITTEN). This is used by do_include. | |
172 | */ | |
173 | ||
174 | void | |
175 | cpp_expand_to_buffer (pfile, buf, length) | |
176 | cpp_reader *pfile; | |
177 | const U_CHAR *buf; | |
178 | int length; | |
179 | { | |
180 | register cpp_buffer *ip; | |
181 | U_CHAR *buf1; | |
182 | int save_no_output; | |
183 | ||
184 | if (length < 0) | |
185 | { | |
186 | cpp_ice (pfile, "length < 0 in cpp_expand_to_buffer"); | |
187 | return; | |
188 | } | |
189 | ||
190 | /* Set up the input on the input stack. */ | |
191 | ||
192 | buf1 = (U_CHAR *) alloca (length + 1); | |
193 | memcpy (buf1, buf, length); | |
194 | buf1[length] = 0; | |
195 | ||
196 | ip = cpp_push_buffer (pfile, buf1, length); | |
197 | if (ip == NULL) | |
198 | return; | |
199 | ip->has_escapes = 1; | |
200 | ||
201 | /* Scan the input, create the output. */ | |
ae79697b ZW |
202 | save_no_output = CPP_OPTION (pfile, no_output); |
203 | CPP_OPTION (pfile, no_output) = 0; | |
204 | CPP_OPTION (pfile, no_line_commands)++; | |
45b966db | 205 | cpp_scan_buffer (pfile); |
ae79697b ZW |
206 | CPP_OPTION (pfile, no_line_commands)--; |
207 | CPP_OPTION (pfile, no_output) = save_no_output; | |
45b966db ZW |
208 | |
209 | CPP_NUL_TERMINATE (pfile); | |
210 | } | |
211 | ||
45b966db ZW |
212 | /* Return the topmost cpp_buffer that corresponds to a file (not a macro). */ |
213 | ||
214 | cpp_buffer * | |
215 | cpp_file_buffer (pfile) | |
216 | cpp_reader *pfile; | |
217 | { | |
218 | cpp_buffer *ip; | |
219 | ||
220 | for (ip = CPP_BUFFER (pfile); ip; ip = CPP_PREV_BUFFER (ip)) | |
221 | if (ip->ihash != NULL) | |
222 | return ip; | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | /* Skip a C-style block comment. We know it's a comment, and point is | |
227 | at the second character of the starter. */ | |
228 | static void | |
229 | skip_block_comment (pfile) | |
230 | cpp_reader *pfile; | |
231 | { | |
3a2b2c7a | 232 | unsigned int line, col; |
61474454 | 233 | const U_CHAR *limit, *cur; |
45b966db ZW |
234 | |
235 | FORWARD(1); | |
3a2b2c7a ZW |
236 | line = CPP_BUF_LINE (CPP_BUFFER (pfile)); |
237 | col = CPP_BUF_COL (CPP_BUFFER (pfile)); | |
61474454 NB |
238 | limit = CPP_BUFFER (pfile)->rlimit; |
239 | cur = CPP_BUFFER (pfile)->cur; | |
240 | ||
241 | while (cur < limit) | |
45b966db | 242 | { |
61474454 NB |
243 | char c = *cur++; |
244 | if (c == '\n' || c == '\r') | |
45b966db ZW |
245 | { |
246 | /* \r cannot be a macro escape marker here. */ | |
247 | if (!ACTIVE_MARK_P (pfile)) | |
61474454 NB |
248 | CPP_BUMP_LINE_CUR (pfile, cur); |
249 | } | |
250 | else if (c == '*') | |
251 | { | |
252 | /* Check for teminator. */ | |
253 | if (cur < limit && *cur == '/') | |
254 | goto out; | |
255 | ||
256 | /* Warn about comment starter embedded in comment. */ | |
257 | if (cur[-2] == '/' && CPP_OPTION (pfile, warn_comments)) | |
258 | cpp_warning_with_line (pfile, CPP_BUFFER (pfile)->lineno, | |
259 | cur - CPP_BUFFER (pfile)->line_base, | |
260 | "'/*' within comment"); | |
45b966db | 261 | } |
45b966db | 262 | } |
61474454 NB |
263 | |
264 | cpp_error_with_line (pfile, line, col, "unterminated comment"); | |
265 | cur--; | |
266 | out: | |
267 | CPP_BUFFER (pfile)->cur = cur + 1; | |
45b966db ZW |
268 | } |
269 | ||
270 | /* Skip a C++/Chill line comment. We know it's a comment, and point | |
271 | is at the second character of the initiator. */ | |
272 | static void | |
273 | skip_line_comment (pfile) | |
274 | cpp_reader *pfile; | |
275 | { | |
276 | FORWARD(1); | |
277 | for (;;) | |
278 | { | |
279 | int c = GETC (); | |
280 | ||
281 | /* We don't have to worry about EOF in here. */ | |
282 | if (c == '\n') | |
283 | { | |
284 | /* Don't consider final '\n' to be part of comment. */ | |
285 | FORWARD(-1); | |
286 | return; | |
287 | } | |
288 | else if (c == '\r') | |
289 | { | |
290 | /* \r cannot be a macro escape marker here. */ | |
291 | if (!ACTIVE_MARK_P (pfile)) | |
292 | CPP_BUMP_LINE (pfile); | |
ae79697b | 293 | if (CPP_OPTION (pfile, warn_comments)) |
45b966db ZW |
294 | cpp_warning (pfile, "backslash-newline within line comment"); |
295 | } | |
296 | } | |
297 | } | |
298 | ||
299 | /* Skip a comment - C, C++, or Chill style. M is the first character | |
300 | of the comment marker. If this really is a comment, skip to its | |
301 | end and return ' '. If this is not a comment, return M (which will | |
302 | be '/' or '-'). */ | |
303 | ||
304 | static int | |
305 | skip_comment (pfile, m) | |
306 | cpp_reader *pfile; | |
307 | int m; | |
308 | { | |
309 | if (m == '/' && PEEKC() == '*') | |
310 | { | |
311 | skip_block_comment (pfile); | |
312 | return ' '; | |
313 | } | |
314 | else if (m == '/' && PEEKC() == '/') | |
315 | { | |
316 | if (CPP_BUFFER (pfile)->system_header_p) | |
317 | { | |
318 | /* We silently allow C++ comments in system headers, irrespective | |
319 | of conformance mode, because lots of busted systems do that | |
320 | and trying to clean it up in fixincludes is a nightmare. */ | |
321 | skip_line_comment (pfile); | |
322 | return ' '; | |
323 | } | |
ae79697b | 324 | else if (CPP_OPTION (pfile, cplusplus_comments)) |
45b966db | 325 | { |
ae79697b | 326 | if (CPP_OPTION (pfile, c89) |
45b966db ZW |
327 | && CPP_PEDANTIC (pfile) |
328 | && ! CPP_BUFFER (pfile)->warned_cplusplus_comments) | |
329 | { | |
330 | cpp_pedwarn (pfile, | |
331 | "C++ style comments are not allowed in ISO C89"); | |
332 | cpp_pedwarn (pfile, | |
333 | "(this will be reported only once per input file)"); | |
334 | CPP_BUFFER (pfile)->warned_cplusplus_comments = 1; | |
335 | } | |
336 | skip_line_comment (pfile); | |
337 | return ' '; | |
338 | } | |
339 | else | |
340 | return m; | |
341 | } | |
342 | else if (m == '-' && PEEKC() == '-' | |
ae79697b | 343 | && CPP_OPTION (pfile, chill)) |
45b966db ZW |
344 | { |
345 | skip_line_comment (pfile); | |
346 | return ' '; | |
347 | } | |
348 | else | |
349 | return m; | |
350 | } | |
351 | ||
352 | /* Identical to skip_comment except that it copies the comment into the | |
353 | token_buffer. This is used if !discard_comments. */ | |
354 | static int | |
355 | copy_comment (pfile, m) | |
356 | cpp_reader *pfile; | |
357 | int m; | |
358 | { | |
359 | const U_CHAR *start = CPP_BUFFER (pfile)->cur; /* XXX Layering violation */ | |
360 | const U_CHAR *limit; | |
361 | ||
362 | if (skip_comment (pfile, m) == m) | |
363 | return m; | |
364 | ||
365 | limit = CPP_BUFFER (pfile)->cur; | |
366 | CPP_RESERVE (pfile, limit - start + 2); | |
367 | CPP_PUTC_Q (pfile, m); | |
368 | for (; start <= limit; start++) | |
369 | if (*start != '\r') | |
370 | CPP_PUTC_Q (pfile, *start); | |
371 | ||
372 | return ' '; | |
373 | } | |
374 | ||
64aaf407 NB |
375 | static void |
376 | null_warning (pfile, count) | |
377 | cpp_reader *pfile; | |
378 | unsigned int count; | |
379 | { | |
380 | if (count == 1) | |
381 | cpp_warning (pfile, "embedded null character ignored"); | |
382 | else | |
383 | cpp_warning (pfile, "embedded null characters ignored"); | |
384 | } | |
385 | ||
45b966db ZW |
386 | /* Skip whitespace \-newline and comments. Does not macro-expand. */ |
387 | ||
388 | void | |
389 | _cpp_skip_hspace (pfile) | |
390 | cpp_reader *pfile; | |
391 | { | |
64aaf407 | 392 | unsigned int null_count = 0; |
45b966db | 393 | int c; |
64aaf407 | 394 | |
45b966db ZW |
395 | while (1) |
396 | { | |
397 | c = GETC(); | |
398 | if (c == EOF) | |
64aaf407 | 399 | goto out; |
45b966db ZW |
400 | else if (is_hspace(c)) |
401 | { | |
402 | if ((c == '\f' || c == '\v') && CPP_PEDANTIC (pfile)) | |
403 | cpp_pedwarn (pfile, "%s in preprocessing directive", | |
404 | c == '\f' ? "formfeed" : "vertical tab"); | |
64aaf407 NB |
405 | else if (c == '\0') |
406 | null_count++; | |
45b966db ZW |
407 | } |
408 | else if (c == '\r') | |
409 | { | |
410 | /* \r is a backslash-newline marker if !has_escapes, and | |
411 | a deletable-whitespace or no-reexpansion marker otherwise. */ | |
412 | if (CPP_BUFFER (pfile)->has_escapes) | |
413 | { | |
414 | if (PEEKC() == ' ') | |
415 | FORWARD(1); | |
416 | else | |
417 | break; | |
418 | } | |
419 | else | |
420 | CPP_BUMP_LINE (pfile); | |
421 | } | |
422 | else if (c == '/' || c == '-') | |
423 | { | |
424 | c = skip_comment (pfile, c); | |
425 | if (c != ' ') | |
426 | break; | |
427 | } | |
428 | else | |
429 | break; | |
430 | } | |
431 | FORWARD(-1); | |
64aaf407 NB |
432 | out: |
433 | if (null_count) | |
434 | null_warning (pfile, null_count); | |
45b966db ZW |
435 | } |
436 | ||
437 | /* Read and discard the rest of the current line. */ | |
438 | ||
439 | void | |
440 | _cpp_skip_rest_of_line (pfile) | |
441 | cpp_reader *pfile; | |
442 | { | |
443 | for (;;) | |
444 | { | |
445 | int c = GETC(); | |
446 | switch (c) | |
447 | { | |
448 | case '\n': | |
449 | FORWARD(-1); | |
450 | case EOF: | |
451 | return; | |
452 | ||
453 | case '\r': | |
454 | if (! CPP_BUFFER (pfile)->has_escapes) | |
455 | CPP_BUMP_LINE (pfile); | |
456 | break; | |
457 | ||
458 | case '\'': | |
459 | case '\"': | |
460 | skip_string (pfile, c); | |
461 | break; | |
462 | ||
463 | case '/': | |
464 | case '-': | |
465 | skip_comment (pfile, c); | |
466 | break; | |
467 | ||
468 | case '\f': | |
469 | case '\v': | |
470 | if (CPP_PEDANTIC (pfile)) | |
471 | cpp_pedwarn (pfile, "%s in preprocessing directive", | |
472 | c == '\f' ? "formfeed" : "vertical tab"); | |
473 | break; | |
474 | ||
475 | } | |
476 | } | |
477 | } | |
478 | ||
479 | /* Parse an identifier starting with C. */ | |
480 | ||
481 | void | |
482 | _cpp_parse_name (pfile, c) | |
483 | cpp_reader *pfile; | |
484 | int c; | |
485 | { | |
486 | for (;;) | |
487 | { | |
488 | if (! is_idchar(c)) | |
489 | { | |
490 | FORWARD (-1); | |
491 | break; | |
492 | } | |
493 | ||
494 | if (c == '$' && CPP_PEDANTIC (pfile)) | |
495 | cpp_pedwarn (pfile, "`$' in identifier"); | |
496 | ||
497 | CPP_RESERVE(pfile, 2); /* One more for final NUL. */ | |
498 | CPP_PUTC_Q (pfile, c); | |
499 | c = GETC(); | |
500 | if (c == EOF) | |
501 | break; | |
502 | } | |
503 | CPP_NUL_TERMINATE_Q (pfile); | |
504 | return; | |
505 | } | |
506 | ||
507 | /* Parse and skip over a string starting with C. A single quoted | |
508 | string is treated like a double -- some programs (e.g., troff) are | |
509 | perverse this way. (However, a single quoted string is not allowed | |
510 | to extend over multiple lines.) */ | |
511 | static void | |
512 | skip_string (pfile, c) | |
513 | cpp_reader *pfile; | |
514 | int c; | |
515 | { | |
3a2b2c7a | 516 | unsigned int start_line, start_column; |
64aaf407 | 517 | unsigned int null_count = 0; |
45b966db | 518 | |
3a2b2c7a ZW |
519 | start_line = CPP_BUF_LINE (CPP_BUFFER (pfile)); |
520 | start_column = CPP_BUF_COL (CPP_BUFFER (pfile)); | |
45b966db ZW |
521 | while (1) |
522 | { | |
523 | int cc = GETC(); | |
524 | switch (cc) | |
525 | { | |
526 | case EOF: | |
527 | cpp_error_with_line (pfile, start_line, start_column, | |
528 | "unterminated string or character constant"); | |
529 | if (pfile->multiline_string_line != start_line | |
530 | && pfile->multiline_string_line != 0) | |
531 | cpp_error_with_line (pfile, | |
532 | pfile->multiline_string_line, -1, | |
533 | "possible real start of unterminated constant"); | |
534 | pfile->multiline_string_line = 0; | |
64aaf407 | 535 | goto out; |
45b966db | 536 | |
64aaf407 NB |
537 | case '\0': |
538 | null_count++; | |
539 | break; | |
540 | ||
45b966db ZW |
541 | case '\n': |
542 | CPP_BUMP_LINE (pfile); | |
543 | /* In Fortran and assembly language, silently terminate | |
544 | strings of either variety at end of line. This is a | |
545 | kludge around not knowing where comments are in these | |
546 | languages. */ | |
ae79697b ZW |
547 | if (CPP_OPTION (pfile, lang_fortran) |
548 | || CPP_OPTION (pfile, lang_asm)) | |
45b966db ZW |
549 | { |
550 | FORWARD(-1); | |
64aaf407 | 551 | goto out; |
45b966db ZW |
552 | } |
553 | /* Character constants may not extend over multiple lines. | |
554 | In Standard C, neither may strings. We accept multiline | |
555 | strings as an extension. */ | |
556 | if (c == '\'') | |
557 | { | |
558 | cpp_error_with_line (pfile, start_line, start_column, | |
559 | "unterminated character constant"); | |
560 | FORWARD(-1); | |
64aaf407 | 561 | goto out; |
45b966db ZW |
562 | } |
563 | if (CPP_PEDANTIC (pfile) && pfile->multiline_string_line == 0) | |
564 | cpp_pedwarn_with_line (pfile, start_line, start_column, | |
565 | "string constant runs past end of line"); | |
566 | if (pfile->multiline_string_line == 0) | |
567 | pfile->multiline_string_line = start_line; | |
568 | break; | |
569 | ||
570 | case '\r': | |
571 | if (CPP_BUFFER (pfile)->has_escapes) | |
572 | { | |
573 | cpp_ice (pfile, "\\r escape inside string constant"); | |
574 | FORWARD(1); | |
575 | } | |
576 | else | |
577 | /* Backslash newline is replaced by nothing at all. */ | |
578 | CPP_BUMP_LINE (pfile); | |
579 | break; | |
580 | ||
581 | case '\\': | |
582 | FORWARD(1); | |
583 | break; | |
584 | ||
585 | case '\"': | |
586 | case '\'': | |
587 | if (cc == c) | |
64aaf407 | 588 | goto out; |
45b966db ZW |
589 | break; |
590 | } | |
591 | } | |
64aaf407 NB |
592 | |
593 | out: | |
594 | if (null_count == 1) | |
595 | cpp_warning (pfile, "null character in string or character constant"); | |
596 | else if (null_count > 1) | |
597 | cpp_warning (pfile, "null characters in string or character constant"); | |
45b966db ZW |
598 | } |
599 | ||
600 | /* Parse a string and copy it to the output. */ | |
601 | ||
602 | static void | |
603 | parse_string (pfile, c) | |
604 | cpp_reader *pfile; | |
605 | int c; | |
606 | { | |
607 | const U_CHAR *start = CPP_BUFFER (pfile)->cur; /* XXX Layering violation */ | |
608 | const U_CHAR *limit; | |
609 | ||
610 | skip_string (pfile, c); | |
611 | ||
612 | limit = CPP_BUFFER (pfile)->cur; | |
613 | CPP_RESERVE (pfile, limit - start + 2); | |
614 | CPP_PUTC_Q (pfile, c); | |
615 | for (; start < limit; start++) | |
616 | if (*start != '\r') | |
617 | CPP_PUTC_Q (pfile, *start); | |
618 | } | |
619 | ||
620 | /* Read an assertion into the token buffer, converting to | |
621 | canonical form: `#predicate(a n swe r)' The next non-whitespace | |
622 | character to read should be the first letter of the predicate. | |
623 | Returns 0 for syntax error, 1 for bare predicate, 2 for predicate | |
624 | with answer (see callers for why). In case of 0, an error has been | |
625 | printed. */ | |
626 | int | |
627 | _cpp_parse_assertion (pfile) | |
628 | cpp_reader *pfile; | |
629 | { | |
630 | int c, dropwhite; | |
631 | _cpp_skip_hspace (pfile); | |
632 | c = PEEKC(); | |
bfab56e7 ZW |
633 | if (c == '\n') |
634 | { | |
635 | cpp_error (pfile, "assertion without predicate"); | |
636 | return 0; | |
637 | } | |
638 | else if (! is_idstart(c)) | |
45b966db ZW |
639 | { |
640 | cpp_error (pfile, "assertion predicate is not an identifier"); | |
641 | return 0; | |
642 | } | |
643 | CPP_PUTC(pfile, '#'); | |
644 | FORWARD(1); | |
645 | _cpp_parse_name (pfile, c); | |
646 | ||
647 | c = PEEKC(); | |
648 | if (c != '(') | |
649 | { | |
650 | if (is_hspace(c) || c == '\r') | |
651 | _cpp_skip_hspace (pfile); | |
652 | c = PEEKC(); | |
653 | } | |
654 | if (c != '(') | |
655 | return 1; | |
656 | ||
657 | CPP_PUTC(pfile, '('); | |
658 | FORWARD(1); | |
659 | dropwhite = 1; | |
660 | while ((c = GETC()) != ')') | |
661 | { | |
662 | if (is_space(c)) | |
663 | { | |
664 | if (! dropwhite) | |
665 | { | |
666 | CPP_PUTC(pfile, ' '); | |
667 | dropwhite = 1; | |
668 | } | |
669 | } | |
670 | else if (c == '\n' || c == EOF) | |
671 | { | |
672 | if (c == '\n') FORWARD(-1); | |
673 | cpp_error (pfile, "un-terminated assertion answer"); | |
674 | return 0; | |
675 | } | |
676 | else if (c == '\r') | |
677 | /* \r cannot be a macro escape here. */ | |
678 | CPP_BUMP_LINE (pfile); | |
679 | else | |
680 | { | |
681 | CPP_PUTC (pfile, c); | |
682 | dropwhite = 0; | |
683 | } | |
684 | } | |
685 | ||
686 | if (pfile->limit[-1] == ' ') | |
687 | pfile->limit[-1] = ')'; | |
688 | else if (pfile->limit[-1] == '(') | |
689 | { | |
690 | cpp_error (pfile, "empty token sequence in assertion"); | |
691 | return 0; | |
692 | } | |
693 | else | |
694 | CPP_PUTC (pfile, ')'); | |
695 | ||
45b966db ZW |
696 | return 2; |
697 | } | |
698 | ||
699 | /* Get the next token, and add it to the text in pfile->token_buffer. | |
700 | Return the kind of token we got. */ | |
701 | ||
3a2b2c7a | 702 | enum cpp_ttype |
45b966db ZW |
703 | _cpp_lex_token (pfile) |
704 | cpp_reader *pfile; | |
705 | { | |
706 | register int c, c2, c3; | |
3a2b2c7a | 707 | enum cpp_ttype token; |
45b966db ZW |
708 | |
709 | get_next: | |
710 | c = GETC(); | |
711 | switch (c) | |
712 | { | |
713 | case EOF: | |
714 | return CPP_EOF; | |
715 | ||
716 | case '/': | |
717 | if (PEEKC () == '=') | |
718 | goto op2; | |
719 | ||
720 | comment: | |
ae79697b | 721 | if (CPP_OPTION (pfile, discard_comments)) |
45b966db ZW |
722 | c = skip_comment (pfile, c); |
723 | else | |
724 | c = copy_comment (pfile, c); | |
725 | if (c != ' ') | |
726 | goto randomchar; | |
727 | ||
728 | /* Comments are equivalent to spaces. | |
729 | For -traditional, a comment is equivalent to nothing. */ | |
ff2b53ef | 730 | if (!CPP_OPTION (pfile, discard_comments)) |
45b966db | 731 | return CPP_COMMENT; |
ff2b53ef ZW |
732 | else if (CPP_TRADITIONAL (pfile) |
733 | && ! is_space (PEEKC ())) | |
734 | { | |
735 | if (pfile->parsing_define_directive) | |
736 | return CPP_COMMENT; | |
737 | else | |
738 | goto get_next; | |
739 | } | |
45b966db ZW |
740 | else |
741 | { | |
742 | CPP_PUTC (pfile, c); | |
743 | return CPP_HSPACE; | |
744 | } | |
745 | ||
746 | case '#': | |
747 | if (pfile->parsing_if_directive) | |
748 | { | |
bfab56e7 ZW |
749 | if (_cpp_parse_assertion (pfile)) |
750 | return CPP_ASSERTION; | |
751 | goto randomchar; | |
45b966db ZW |
752 | } |
753 | ||
754 | if (pfile->parsing_define_directive && ! CPP_TRADITIONAL (pfile)) | |
755 | { | |
756 | CPP_RESERVE (pfile, 3); | |
757 | CPP_PUTC_Q (pfile, '#'); | |
758 | CPP_NUL_TERMINATE_Q (pfile); | |
759 | if (PEEKC () != '#') | |
760 | return CPP_STRINGIZE; | |
761 | ||
762 | FORWARD (1); | |
763 | CPP_PUTC_Q (pfile, '#'); | |
764 | CPP_NUL_TERMINATE_Q (pfile); | |
765 | return CPP_TOKPASTE; | |
766 | } | |
767 | ||
768 | if (!pfile->only_seen_white) | |
769 | goto randomchar; | |
45b966db ZW |
770 | return CPP_DIRECTIVE; |
771 | ||
772 | case '\"': | |
773 | case '\'': | |
774 | parse_string (pfile, c); | |
45b966db ZW |
775 | return c == '\'' ? CPP_CHAR : CPP_STRING; |
776 | ||
777 | case '$': | |
ae79697b | 778 | if (!CPP_OPTION (pfile, dollars_in_ident)) |
45b966db ZW |
779 | goto randomchar; |
780 | goto letter; | |
781 | ||
782 | case ':': | |
ae79697b | 783 | if (CPP_OPTION (pfile, cplusplus) && PEEKC () == ':') |
45b966db ZW |
784 | goto op2; |
785 | goto randomchar; | |
786 | ||
787 | case '&': | |
788 | case '+': | |
789 | case '|': | |
790 | c2 = PEEKC (); | |
791 | if (c2 == c || c2 == '=') | |
792 | goto op2; | |
793 | goto randomchar; | |
794 | ||
795 | case '*': | |
796 | case '!': | |
797 | case '%': | |
798 | case '=': | |
799 | case '^': | |
800 | if (PEEKC () == '=') | |
801 | goto op2; | |
802 | goto randomchar; | |
803 | ||
804 | case '-': | |
805 | c2 = PEEKC (); | |
806 | if (c2 == '-') | |
807 | { | |
ae79697b | 808 | if (CPP_OPTION (pfile, chill)) |
45b966db ZW |
809 | goto comment; /* Chill style comment */ |
810 | else | |
811 | goto op2; | |
812 | } | |
813 | else if (c2 == '=') | |
814 | goto op2; | |
815 | else if (c2 == '>') | |
816 | { | |
ae79697b | 817 | if (CPP_OPTION (pfile, cplusplus) && PEEKN (1) == '*') |
45b966db ZW |
818 | { |
819 | /* In C++, there's a ->* operator. */ | |
820 | token = CPP_OTHER; | |
45b966db ZW |
821 | CPP_RESERVE (pfile, 4); |
822 | CPP_PUTC_Q (pfile, c); | |
823 | CPP_PUTC_Q (pfile, GETC ()); | |
824 | CPP_PUTC_Q (pfile, GETC ()); | |
825 | CPP_NUL_TERMINATE_Q (pfile); | |
826 | return token; | |
827 | } | |
828 | goto op2; | |
829 | } | |
830 | goto randomchar; | |
831 | ||
832 | case '<': | |
833 | if (pfile->parsing_include_directive) | |
834 | { | |
835 | for (;;) | |
836 | { | |
837 | CPP_PUTC (pfile, c); | |
838 | if (c == '>') | |
839 | break; | |
840 | c = GETC (); | |
841 | if (c == '\n' || c == EOF) | |
842 | { | |
843 | cpp_error (pfile, | |
844 | "missing '>' in `#include <FILENAME>'"); | |
845 | break; | |
846 | } | |
847 | else if (c == '\r') | |
848 | { | |
849 | if (!CPP_BUFFER (pfile)->has_escapes) | |
850 | { | |
851 | /* Backslash newline is replaced by nothing. */ | |
852 | CPP_ADJUST_WRITTEN (pfile, -1); | |
853 | CPP_BUMP_LINE (pfile); | |
854 | } | |
855 | else | |
856 | { | |
857 | /* We might conceivably get \r- or \r<space> in | |
858 | here. Just delete 'em. */ | |
859 | int d = GETC(); | |
860 | if (d != '-' && d != ' ') | |
861 | cpp_ice (pfile, "unrecognized escape \\r%c", d); | |
862 | CPP_ADJUST_WRITTEN (pfile, -1); | |
863 | } | |
864 | } | |
865 | } | |
866 | return CPP_STRING; | |
867 | } | |
868 | /* else fall through */ | |
869 | case '>': | |
870 | c2 = PEEKC (); | |
871 | if (c2 == '=') | |
872 | goto op2; | |
873 | /* GNU C++ supports MIN and MAX operators <? and >?. */ | |
ae79697b | 874 | if (c2 != c && (!CPP_OPTION (pfile, cplusplus) || c2 != '?')) |
45b966db ZW |
875 | goto randomchar; |
876 | FORWARD(1); | |
877 | CPP_RESERVE (pfile, 4); | |
878 | CPP_PUTC (pfile, c); | |
879 | CPP_PUTC (pfile, c2); | |
880 | c3 = PEEKC (); | |
881 | if (c3 == '=') | |
882 | CPP_PUTC_Q (pfile, GETC ()); | |
883 | CPP_NUL_TERMINATE_Q (pfile); | |
45b966db ZW |
884 | return CPP_OTHER; |
885 | ||
886 | case '.': | |
887 | c2 = PEEKC (); | |
888 | if (ISDIGIT(c2)) | |
889 | { | |
890 | CPP_RESERVE(pfile, 2); | |
891 | CPP_PUTC_Q (pfile, '.'); | |
892 | c = GETC (); | |
893 | goto number; | |
894 | } | |
895 | ||
896 | /* In C++ there's a .* operator. */ | |
ae79697b | 897 | if (CPP_OPTION (pfile, cplusplus) && c2 == '*') |
45b966db ZW |
898 | goto op2; |
899 | ||
900 | if (c2 == '.' && PEEKN(1) == '.') | |
901 | { | |
902 | CPP_RESERVE(pfile, 4); | |
903 | CPP_PUTC_Q (pfile, '.'); | |
904 | CPP_PUTC_Q (pfile, '.'); | |
905 | CPP_PUTC_Q (pfile, '.'); | |
906 | FORWARD (2); | |
907 | CPP_NUL_TERMINATE_Q (pfile); | |
45b966db ZW |
908 | return CPP_3DOTS; |
909 | } | |
910 | goto randomchar; | |
911 | ||
912 | op2: | |
913 | token = CPP_OTHER; | |
45b966db ZW |
914 | CPP_RESERVE(pfile, 3); |
915 | CPP_PUTC_Q (pfile, c); | |
916 | CPP_PUTC_Q (pfile, GETC ()); | |
917 | CPP_NUL_TERMINATE_Q (pfile); | |
918 | return token; | |
919 | ||
920 | case 'L': | |
921 | c2 = PEEKC (); | |
922 | if ((c2 == '\'' || c2 == '\"') && !CPP_TRADITIONAL (pfile)) | |
923 | { | |
924 | CPP_PUTC (pfile, c); | |
925 | c = GETC (); | |
926 | parse_string (pfile, c); | |
45b966db ZW |
927 | return c == '\'' ? CPP_WCHAR : CPP_WSTRING; |
928 | } | |
929 | goto letter; | |
930 | ||
931 | case '0': case '1': case '2': case '3': case '4': | |
932 | case '5': case '6': case '7': case '8': case '9': | |
933 | number: | |
934 | c2 = '.'; | |
935 | for (;;) | |
936 | { | |
937 | CPP_RESERVE (pfile, 2); | |
938 | CPP_PUTC_Q (pfile, c); | |
939 | c = PEEKC (); | |
940 | if (c == EOF) | |
941 | break; | |
942 | if (!is_numchar(c) && c != '.' | |
943 | && ((c2 != 'e' && c2 != 'E' | |
944 | && ((c2 != 'p' && c2 != 'P') | |
ae79697b | 945 | || CPP_OPTION (pfile, c89))) |
45b966db ZW |
946 | || (c != '+' && c != '-'))) |
947 | break; | |
948 | FORWARD(1); | |
949 | c2= c; | |
950 | } | |
951 | CPP_NUL_TERMINATE_Q (pfile); | |
45b966db ZW |
952 | return CPP_NUMBER; |
953 | case 'b': case 'c': case 'd': case 'h': case 'o': | |
954 | case 'B': case 'C': case 'D': case 'H': case 'O': | |
ae79697b | 955 | if (CPP_OPTION (pfile, chill) && PEEKC () == '\'') |
45b966db | 956 | { |
45b966db ZW |
957 | CPP_RESERVE (pfile, 2); |
958 | CPP_PUTC_Q (pfile, c); | |
959 | CPP_PUTC_Q (pfile, '\''); | |
960 | FORWARD(1); | |
961 | for (;;) | |
962 | { | |
963 | c = GETC(); | |
964 | if (c == EOF) | |
965 | goto chill_number_eof; | |
966 | if (!is_numchar(c)) | |
967 | break; | |
968 | CPP_PUTC (pfile, c); | |
969 | } | |
970 | if (c == '\'') | |
971 | { | |
972 | CPP_RESERVE (pfile, 2); | |
973 | CPP_PUTC_Q (pfile, c); | |
974 | CPP_NUL_TERMINATE_Q (pfile); | |
975 | return CPP_STRING; | |
976 | } | |
977 | else | |
978 | { | |
979 | FORWARD(-1); | |
980 | chill_number_eof: | |
981 | CPP_NUL_TERMINATE (pfile); | |
982 | return CPP_NUMBER; | |
983 | } | |
984 | } | |
985 | else | |
986 | goto letter; | |
987 | case '_': | |
988 | case 'a': case 'e': case 'f': case 'g': case 'i': case 'j': | |
989 | case 'k': case 'l': case 'm': case 'n': case 'p': case 'q': | |
990 | case 'r': case 's': case 't': case 'u': case 'v': case 'w': | |
991 | case 'x': case 'y': case 'z': | |
992 | case 'A': case 'E': case 'F': case 'G': case 'I': case 'J': | |
993 | case 'K': case 'M': case 'N': case 'P': case 'Q': case 'R': | |
994 | case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': | |
995 | case 'Y': case 'Z': | |
996 | letter: | |
45b966db ZW |
997 | _cpp_parse_name (pfile, c); |
998 | return CPP_MACRO; | |
999 | ||
64aaf407 NB |
1000 | case ' ': case '\t': case '\v': case '\f': case '\0': |
1001 | { | |
1002 | int null_count = 0; | |
1003 | ||
1004 | for (;;) | |
1005 | { | |
1006 | if (c == '\0') | |
1007 | null_count++; | |
1008 | else | |
1009 | CPP_PUTC (pfile, c); | |
1010 | c = PEEKC (); | |
1011 | if (c == EOF || !is_hspace(c)) | |
1012 | break; | |
1013 | FORWARD(1); | |
1014 | } | |
1015 | if (null_count) | |
1016 | null_warning (pfile, null_count); | |
1017 | return CPP_HSPACE; | |
1018 | } | |
45b966db ZW |
1019 | |
1020 | case '\r': | |
1021 | if (CPP_BUFFER (pfile)->has_escapes) | |
1022 | { | |
1023 | c = GETC (); | |
1024 | if (c == '-') | |
1025 | { | |
1026 | if (pfile->output_escapes) | |
1027 | CPP_PUTS (pfile, "\r-", 2); | |
1028 | _cpp_parse_name (pfile, GETC ()); | |
1029 | return CPP_NAME; | |
1030 | } | |
1031 | else if (c == ' ') | |
1032 | { | |
ff2b53ef ZW |
1033 | /* "\r " means a space, but only if necessary to prevent |
1034 | accidental token concatenation. */ | |
45b966db ZW |
1035 | CPP_RESERVE (pfile, 2); |
1036 | if (pfile->output_escapes) | |
1037 | CPP_PUTC_Q (pfile, '\r'); | |
1038 | CPP_PUTC_Q (pfile, c); | |
1039 | return CPP_HSPACE; | |
1040 | } | |
1041 | else | |
1042 | { | |
1043 | cpp_ice (pfile, "unrecognized escape \\r%c", c); | |
1044 | goto get_next; | |
1045 | } | |
1046 | } | |
1047 | else | |
1048 | { | |
1049 | /* Backslash newline is ignored. */ | |
1050 | CPP_BUMP_LINE (pfile); | |
1051 | goto get_next; | |
1052 | } | |
1053 | ||
1054 | case '\n': | |
1055 | CPP_PUTC (pfile, c); | |
45b966db ZW |
1056 | return CPP_VSPACE; |
1057 | ||
1058 | case '(': token = CPP_LPAREN; goto char1; | |
1059 | case ')': token = CPP_RPAREN; goto char1; | |
1060 | case '{': token = CPP_LBRACE; goto char1; | |
1061 | case '}': token = CPP_RBRACE; goto char1; | |
1062 | case ',': token = CPP_COMMA; goto char1; | |
1063 | case ';': token = CPP_SEMICOLON; goto char1; | |
1064 | ||
1065 | randomchar: | |
1066 | default: | |
1067 | token = CPP_OTHER; | |
1068 | char1: | |
45b966db ZW |
1069 | CPP_PUTC (pfile, c); |
1070 | return token; | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | /* Check for and expand a macro, which is from WRITTEN to CPP_WRITTEN (pfile). | |
1075 | Caller is expected to have checked no_macro_expand. */ | |
1076 | static int | |
1077 | maybe_macroexpand (pfile, written) | |
1078 | cpp_reader *pfile; | |
1079 | long written; | |
1080 | { | |
1081 | U_CHAR *macro = pfile->token_buffer + written; | |
1082 | size_t len = CPP_WRITTEN (pfile) - written; | |
1083 | HASHNODE *hp = _cpp_lookup (pfile, macro, len); | |
1084 | ||
1085 | if (!hp) | |
1086 | return 0; | |
1087 | if (hp->type == T_DISABLED) | |
1088 | { | |
1089 | if (pfile->output_escapes) | |
1090 | { | |
1091 | /* Insert a no-reexpand marker before IDENT. */ | |
1092 | CPP_RESERVE (pfile, 2); | |
1093 | CPP_ADJUST_WRITTEN (pfile, 2); | |
1094 | macro = pfile->token_buffer + written; | |
1095 | ||
1096 | memmove (macro + 2, macro, len); | |
1097 | macro[0] = '\r'; | |
1098 | macro[1] = '-'; | |
1099 | } | |
1100 | return 0; | |
1101 | } | |
ff2b53ef ZW |
1102 | if (hp->type == T_EMPTY) |
1103 | { | |
1104 | /* Special case optimization: macro expands to nothing. */ | |
1105 | CPP_SET_WRITTEN (pfile, written); | |
1106 | CPP_PUTC_Q (pfile, ' '); | |
1107 | return 1; | |
1108 | } | |
45b966db ZW |
1109 | |
1110 | /* If macro wants an arglist, verify that a '(' follows. */ | |
1111 | if (hp->type == T_MACRO && hp->value.defn->nargs >= 0) | |
1112 | { | |
1113 | int macbuf_whitespace = 0; | |
1114 | int c; | |
1115 | ||
1116 | while (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile))) | |
1117 | { | |
1118 | const U_CHAR *point = CPP_BUFFER (pfile)->cur; | |
1119 | for (;;) | |
1120 | { | |
1121 | _cpp_skip_hspace (pfile); | |
1122 | c = PEEKC (); | |
1123 | if (c == '\n') | |
1124 | FORWARD(1); | |
1125 | else | |
1126 | break; | |
1127 | } | |
1128 | if (point != CPP_BUFFER (pfile)->cur) | |
1129 | macbuf_whitespace = 1; | |
1130 | if (c == '(') | |
1131 | goto is_macro_call; | |
1132 | else if (c != EOF) | |
1133 | goto not_macro_call; | |
1134 | cpp_pop_buffer (pfile); | |
1135 | } | |
1136 | ||
1137 | CPP_SET_MARK (pfile); | |
1138 | for (;;) | |
1139 | { | |
1140 | _cpp_skip_hspace (pfile); | |
1141 | c = PEEKC (); | |
1142 | if (c == '\n') | |
1143 | FORWARD(1); | |
1144 | else | |
1145 | break; | |
1146 | } | |
1147 | CPP_GOTO_MARK (pfile); | |
1148 | ||
1149 | if (c != '(') | |
1150 | { | |
1151 | not_macro_call: | |
1152 | if (macbuf_whitespace) | |
1153 | CPP_PUTC (pfile, ' '); | |
1154 | return 0; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | is_macro_call: | |
1159 | /* This is now known to be a macro call. | |
1160 | Expand the macro, reading arguments as needed, | |
1161 | and push the expansion on the input stack. */ | |
1162 | _cpp_macroexpand (pfile, hp); | |
1163 | CPP_SET_WRITTEN (pfile, written); | |
1164 | return 1; | |
1165 | } | |
1166 | ||
3a2b2c7a | 1167 | enum cpp_ttype |
45b966db ZW |
1168 | cpp_get_token (pfile) |
1169 | cpp_reader *pfile; | |
1170 | { | |
3a2b2c7a | 1171 | enum cpp_ttype token; |
45b966db ZW |
1172 | long written = CPP_WRITTEN (pfile); |
1173 | ||
1174 | get_next: | |
1175 | token = _cpp_lex_token (pfile); | |
1176 | ||
1177 | switch (token) | |
1178 | { | |
1179 | default: | |
ff2b53ef ZW |
1180 | pfile->potential_control_macro = 0; |
1181 | pfile->only_seen_white = 0; | |
1182 | return token; | |
1183 | ||
1184 | case CPP_VSPACE: | |
1185 | if (pfile->only_seen_white == 0) | |
1186 | pfile->only_seen_white = 1; | |
1187 | CPP_BUMP_LINE (pfile); | |
1188 | if (! CPP_OPTION (pfile, no_line_commands)) | |
1189 | { | |
1190 | pfile->lineno++; | |
1191 | if (CPP_BUFFER (pfile)->lineno != pfile->lineno) | |
1192 | _cpp_output_line_command (pfile, same_file); | |
1193 | } | |
1194 | return token; | |
1195 | ||
1196 | case CPP_HSPACE: | |
1197 | case CPP_COMMENT: | |
45b966db ZW |
1198 | return token; |
1199 | ||
1200 | case CPP_DIRECTIVE: | |
ff2b53ef | 1201 | pfile->potential_control_macro = 0; |
45b966db ZW |
1202 | if (_cpp_handle_directive (pfile)) |
1203 | return CPP_DIRECTIVE; | |
1204 | pfile->only_seen_white = 0; | |
1205 | CPP_PUTC (pfile, '#'); | |
1206 | return CPP_OTHER; | |
1207 | ||
1208 | case CPP_MACRO: | |
ff2b53ef ZW |
1209 | pfile->potential_control_macro = 0; |
1210 | pfile->only_seen_white = 0; | |
45b966db ZW |
1211 | if (! pfile->no_macro_expand |
1212 | && maybe_macroexpand (pfile, written)) | |
1213 | goto get_next; | |
1214 | return CPP_NAME; | |
1215 | ||
1216 | case CPP_EOF: | |
1217 | if (CPP_BUFFER (pfile)->manual_pop) | |
1218 | /* If we've been reading from redirected input, the | |
1219 | frontend will pop the buffer. */ | |
1220 | return CPP_EOF; | |
1221 | else if (CPP_BUFFER (pfile)->seen_eof) | |
1222 | { | |
1223 | if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) == NULL) | |
1224 | return CPP_EOF; | |
1225 | ||
1226 | cpp_pop_buffer (pfile); | |
1227 | goto get_next; | |
1228 | } | |
1229 | else | |
1230 | { | |
1231 | _cpp_handle_eof (pfile); | |
1232 | return CPP_POP; | |
1233 | } | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | /* Like cpp_get_token, but skip spaces and comments. */ | |
1238 | ||
3a2b2c7a | 1239 | enum cpp_ttype |
45b966db ZW |
1240 | cpp_get_non_space_token (pfile) |
1241 | cpp_reader *pfile; | |
1242 | { | |
1243 | int old_written = CPP_WRITTEN (pfile); | |
1244 | for (;;) | |
1245 | { | |
3a2b2c7a | 1246 | enum cpp_ttype token = cpp_get_token (pfile); |
ff2b53ef | 1247 | if (token != CPP_COMMENT && token != CPP_HSPACE && token != CPP_VSPACE) |
45b966db ZW |
1248 | return token; |
1249 | CPP_SET_WRITTEN (pfile, old_written); | |
1250 | } | |
1251 | } | |
1252 | ||
ff2b53ef ZW |
1253 | /* Like cpp_get_token, except that it does not execute directives, |
1254 | does not consume vertical space, and automatically pops off macro | |
1255 | buffers. | |
45b966db | 1256 | |
ff2b53ef ZW |
1257 | XXX This function will exist only till collect_expansion doesn't |
1258 | need to see whitespace anymore, then it'll be merged with | |
1259 | _cpp_get_directive_token (below). */ | |
3a2b2c7a | 1260 | enum cpp_ttype |
ff2b53ef | 1261 | _cpp_get_define_token (pfile) |
45b966db ZW |
1262 | cpp_reader *pfile; |
1263 | { | |
ff2b53ef | 1264 | long old_written; |
3a2b2c7a | 1265 | enum cpp_ttype token; |
45b966db | 1266 | |
ff2b53ef ZW |
1267 | get_next: |
1268 | old_written = CPP_WRITTEN (pfile); | |
1269 | token = _cpp_lex_token (pfile); | |
1270 | switch (token) | |
45b966db | 1271 | { |
ff2b53ef ZW |
1272 | default: |
1273 | return token; | |
45b966db | 1274 | |
ff2b53ef ZW |
1275 | case CPP_VSPACE: |
1276 | /* Put it back and return VSPACE. */ | |
1277 | FORWARD(-1); | |
1278 | CPP_ADJUST_WRITTEN (pfile, -1); | |
1279 | return CPP_VSPACE; | |
45b966db | 1280 | |
ff2b53ef ZW |
1281 | case CPP_HSPACE: |
1282 | if (CPP_PEDANTIC (pfile)) | |
45b966db | 1283 | { |
ff2b53ef ZW |
1284 | U_CHAR *p, *limit; |
1285 | p = pfile->token_buffer + old_written; | |
1286 | limit = CPP_PWRITTEN (pfile); | |
1287 | while (p < limit) | |
1288 | { | |
1289 | if (*p == '\v' || *p == '\f') | |
1290 | cpp_pedwarn (pfile, "%s in preprocessing directive", | |
1291 | *p == '\f' ? "formfeed" : "vertical tab"); | |
1292 | p++; | |
1293 | } | |
45b966db | 1294 | } |
ff2b53ef | 1295 | return CPP_HSPACE; |
45b966db | 1296 | |
ff2b53ef ZW |
1297 | case CPP_DIRECTIVE: |
1298 | /* Don't execute the directive, but don't smash it to OTHER either. */ | |
1299 | CPP_PUTC (pfile, '#'); | |
1300 | return CPP_DIRECTIVE; | |
1301 | ||
1302 | case CPP_MACRO: | |
1303 | if (! pfile->no_macro_expand | |
1304 | && maybe_macroexpand (pfile, old_written)) | |
1305 | goto get_next; | |
1306 | return CPP_NAME; | |
45b966db | 1307 | |
ff2b53ef ZW |
1308 | case CPP_EOF: |
1309 | if (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile))) | |
45b966db | 1310 | { |
ff2b53ef ZW |
1311 | cpp_pop_buffer (pfile); |
1312 | goto get_next; | |
45b966db | 1313 | } |
ff2b53ef ZW |
1314 | else |
1315 | /* This can happen for files that don't end with a newline, | |
1316 | and for cpp_define and friends. Pretend they do, so | |
1317 | callers don't have to deal. A warning will be issued by | |
1318 | someone else, if necessary. */ | |
1319 | return CPP_VSPACE; | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | /* Just like _cpp_get_define_token except that it discards horizontal | |
1324 | whitespace. */ | |
45b966db | 1325 | |
3a2b2c7a | 1326 | enum cpp_ttype |
ff2b53ef ZW |
1327 | _cpp_get_directive_token (pfile) |
1328 | cpp_reader *pfile; | |
1329 | { | |
1330 | int old_written = CPP_WRITTEN (pfile); | |
1331 | for (;;) | |
1332 | { | |
3a2b2c7a | 1333 | enum cpp_ttype token = _cpp_get_define_token (pfile); |
ff2b53ef ZW |
1334 | if (token != CPP_COMMENT && token != CPP_HSPACE) |
1335 | return token; | |
1336 | CPP_SET_WRITTEN (pfile, old_written); | |
45b966db ZW |
1337 | } |
1338 | } | |
1339 | ||
1340 | /* Determine the current line and column. Used only by read_and_prescan. */ | |
1341 | static U_CHAR * | |
1342 | find_position (start, limit, linep) | |
1343 | U_CHAR *start; | |
1344 | U_CHAR *limit; | |
1345 | unsigned long *linep; | |
1346 | { | |
1347 | unsigned long line = *linep; | |
1348 | U_CHAR *lbase = start; | |
1349 | while (start < limit) | |
1350 | { | |
1351 | U_CHAR ch = *start++; | |
1352 | if (ch == '\n' || ch == '\r') | |
1353 | { | |
1354 | line++; | |
1355 | lbase = start; | |
1356 | } | |
1357 | } | |
1358 | *linep = line; | |
1359 | return lbase; | |
1360 | } | |
1361 | ||
2a87fbe8 ZW |
1362 | /* The following table is used by _cpp_read_and_prescan. If we have |
1363 | designated initializers, it can be constant data; otherwise, it is | |
1364 | set up at runtime by _cpp_init_input_buffer. */ | |
46d07497 ZW |
1365 | |
1366 | #ifndef UCHAR_MAX | |
1367 | #define UCHAR_MAX 255 /* assume 8-bit bytes */ | |
1368 | #endif | |
1369 | ||
1370 | #if (GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L) | |
2a87fbe8 ZW |
1371 | #define init_chartab() /* nothing */ |
1372 | #define CHARTAB static const unsigned char chartab[UCHAR_MAX + 1] = { | |
46d07497 ZW |
1373 | #define END }; |
1374 | #define s(p, v) [p] = v, | |
1375 | #else | |
2a87fbe8 ZW |
1376 | #define CHARTAB static unsigned char chartab[UCHAR_MAX + 1] = { 0 }; \ |
1377 | static void init_chartab PARAMS ((void)) { \ | |
1378 | unsigned char *x = chartab; | |
46d07497 ZW |
1379 | #define END } |
1380 | #define s(p, v) x[p] = v; | |
1381 | #endif | |
1382 | ||
1383 | /* Table of characters that can't be handled in the inner loop. | |
2a87fbe8 ZW |
1384 | Also contains the mapping between trigraph third characters and their |
1385 | replacements. */ | |
46d07497 ZW |
1386 | #define SPECCASE_CR 1 |
1387 | #define SPECCASE_BACKSLASH 2 | |
1388 | #define SPECCASE_QUESTION 3 | |
1389 | ||
2a87fbe8 | 1390 | CHARTAB |
46d07497 ZW |
1391 | s('\r', SPECCASE_CR) |
1392 | s('\\', SPECCASE_BACKSLASH) | |
1393 | s('?', SPECCASE_QUESTION) | |
46d07497 | 1394 | |
46d07497 ZW |
1395 | s('=', '#') s(')', ']') s('!', '|') |
1396 | s('(', '[') s('\'', '^') s('>', '}') | |
1397 | s('/', '\\') s('<', '{') s('-', '~') | |
1398 | END | |
1399 | ||
1400 | #undef CHARTAB | |
46d07497 ZW |
1401 | #undef END |
1402 | #undef s | |
1403 | ||
2a87fbe8 ZW |
1404 | #define NORMAL(c) ((chartab[c]) == 0 || (chartab[c]) > SPECCASE_QUESTION) |
1405 | #define NONTRI(c) ((c) <= SPECCASE_QUESTION) | |
1406 | ||
45b966db ZW |
1407 | /* Read the entire contents of file DESC into buffer BUF. LEN is how |
1408 | much memory to allocate initially; more will be allocated if | |
1409 | necessary. Convert end-of-line markers (\n, \r, \r\n, \n\r) to | |
1410 | canonical form (\n). If enabled, convert and/or warn about | |
1411 | trigraphs. Convert backslash-newline to a one-character escape | |
1412 | (\r) and remove it from "embarrassing" places (i.e. the middle of a | |
1413 | token). If there is no newline at the end of the file, add one and | |
1414 | warn. Returns -1 on failure, or the actual length of the data to | |
1415 | be scanned. | |
1416 | ||
1417 | This function does a lot of work, and can be a serious performance | |
1418 | bottleneck. It has been tuned heavily; make sure you understand it | |
1419 | before hacking. The common case - no trigraphs, Unix style line | |
1420 | breaks, backslash-newline set off by whitespace, newline at EOF - | |
1421 | has been optimized at the expense of the others. The performance | |
1422 | penalty for DOS style line breaks (\r\n) is about 15%. | |
1423 | ||
1424 | Warnings lose particularly heavily since we have to determine the | |
1425 | line number, which involves scanning from the beginning of the file | |
1426 | or from the last warning. The penalty for the absence of a newline | |
1427 | at the end of reload1.c is about 60%. (reload1.c is 329k.) | |
1428 | ||
1429 | If your file has more than one kind of end-of-line marker, you | |
04e3ec78 NB |
1430 | will get messed-up line numbering. |
1431 | ||
1432 | So that the cases of the switch statement do not have to concern | |
1433 | themselves with the complications of reading beyond the end of the | |
1434 | buffer, the buffer is guaranteed to have at least 3 characters in | |
1435 | it (or however many are left in the file, if less) on entry to the | |
1436 | switch. This is enough to handle trigraphs and the "\\\n\r" and | |
1437 | "\\\r\n" cases. | |
1438 | ||
1439 | The end of the buffer is marked by a '\\', which, being a special | |
1440 | character, guarantees we will exit the fast-scan loops and perform | |
1441 | a refill. */ | |
46d07497 | 1442 | |
45b966db ZW |
1443 | long |
1444 | _cpp_read_and_prescan (pfile, fp, desc, len) | |
1445 | cpp_reader *pfile; | |
1446 | cpp_buffer *fp; | |
1447 | int desc; | |
1448 | size_t len; | |
1449 | { | |
1450 | U_CHAR *buf = (U_CHAR *) xmalloc (len); | |
1451 | U_CHAR *ip, *op, *line_base; | |
1452 | U_CHAR *ibase; | |
45b966db ZW |
1453 | unsigned long line; |
1454 | unsigned int deferred_newlines; | |
45b966db | 1455 | size_t offset; |
04e3ec78 | 1456 | int count = 0; |
45b966db ZW |
1457 | |
1458 | offset = 0; | |
04e3ec78 | 1459 | deferred_newlines = 0; |
45b966db ZW |
1460 | op = buf; |
1461 | line_base = buf; | |
1462 | line = 1; | |
04e3ec78 NB |
1463 | ibase = pfile->input_buffer + 3; |
1464 | ip = ibase; | |
1465 | ip[-1] = '\0'; /* Guarantee no match with \n for SPECCASE_CR */ | |
45b966db ZW |
1466 | |
1467 | for (;;) | |
1468 | { | |
04e3ec78 NB |
1469 | U_CHAR *near_buff_end; |
1470 | ||
1471 | /* Copy previous char plus unprocessed (at most 2) chars | |
1472 | to beginning of buffer, refill it with another | |
1473 | read(), and continue processing */ | |
1474 | memcpy(ip - count - 1, ip - 1, 3); | |
1475 | ip -= count; | |
45b966db | 1476 | |
04e3ec78 | 1477 | count = read (desc, ibase, pfile->input_buffer_len); |
45b966db ZW |
1478 | if (count < 0) |
1479 | goto error; | |
04e3ec78 NB |
1480 | |
1481 | ibase[count] = '\\'; /* Marks end of buffer */ | |
1482 | if (count) | |
45b966db | 1483 | { |
04e3ec78 NB |
1484 | near_buff_end = pfile->input_buffer + count; |
1485 | offset += count; | |
45b966db | 1486 | if (offset > len) |
04e3ec78 NB |
1487 | { |
1488 | size_t delta_op; | |
1489 | size_t delta_line_base; | |
1490 | len *= 2; | |
1491 | if (offset > len) | |
1492 | /* len overflowed. | |
1493 | This could happen if the file is larger than half the | |
1494 | maximum address space of the machine. */ | |
1495 | goto too_big; | |
1496 | ||
1497 | delta_op = op - buf; | |
1498 | delta_line_base = line_base - buf; | |
1499 | buf = (U_CHAR *) xrealloc (buf, len); | |
1500 | op = buf + delta_op; | |
1501 | line_base = buf + delta_line_base; | |
1502 | } | |
1503 | } | |
1504 | else | |
1505 | { | |
1506 | if (ip == ibase) | |
1507 | break; | |
1508 | /* Allow normal processing of the (at most 2) remaining | |
1509 | characters. The end-of-buffer marker is still present | |
1510 | and prevents false matches within the switch. */ | |
1511 | near_buff_end = ibase - 1; | |
45b966db ZW |
1512 | } |
1513 | ||
1514 | for (;;) | |
1515 | { | |
04e3ec78 | 1516 | unsigned int span; |
45b966db | 1517 | |
04e3ec78 | 1518 | /* Deal with \-newline, potentially in the middle of a token. */ |
45b966db ZW |
1519 | if (deferred_newlines) |
1520 | { | |
2a87fbe8 | 1521 | if (op != buf && ! is_space (op[-1]) && op[-1] != '\r') |
04e3ec78 NB |
1522 | { |
1523 | /* Previous was not white space. Skip to white | |
1524 | space, if we can, before outputting the \r's */ | |
1525 | span = 0; | |
1526 | while (ip[span] != ' ' | |
1527 | && ip[span] != '\t' | |
1528 | && ip[span] != '\n' | |
2a87fbe8 | 1529 | && NORMAL(ip[span])) |
04e3ec78 NB |
1530 | span++; |
1531 | memcpy (op, ip, span); | |
1532 | op += span; | |
1533 | ip += span; | |
2a87fbe8 | 1534 | if (! NORMAL(ip[0])) |
04e3ec78 NB |
1535 | goto do_speccase; |
1536 | } | |
1537 | while (deferred_newlines) | |
1538 | deferred_newlines--, *op++ = '\r'; | |
45b966db ZW |
1539 | } |
1540 | ||
1541 | /* Copy as much as we can without special treatment. */ | |
04e3ec78 | 1542 | span = 0; |
2a87fbe8 | 1543 | while (NORMAL (ip[span])) span++; |
45b966db ZW |
1544 | memcpy (op, ip, span); |
1545 | op += span; | |
1546 | ip += span; | |
1547 | ||
04e3ec78 NB |
1548 | do_speccase: |
1549 | if (ip > near_buff_end) /* Do we have enough chars? */ | |
1550 | break; | |
2a87fbe8 | 1551 | switch (chartab[*ip++]) |
45b966db | 1552 | { |
45b966db | 1553 | case SPECCASE_CR: /* \r */ |
04e3ec78 | 1554 | if (ip[-2] != '\n') |
45b966db | 1555 | { |
04e3ec78 NB |
1556 | if (*ip == '\n') |
1557 | ip++; | |
1558 | *op++ = '\n'; | |
45b966db | 1559 | } |
45b966db ZW |
1560 | break; |
1561 | ||
1562 | case SPECCASE_BACKSLASH: /* \ */ | |
04e3ec78 | 1563 | if (*ip == '\n') |
45b966db | 1564 | { |
04e3ec78 | 1565 | deferred_newlines++; |
45b966db ZW |
1566 | ip++; |
1567 | if (*ip == '\r') ip++; | |
45b966db ZW |
1568 | } |
1569 | else if (*ip == '\r') | |
1570 | { | |
04e3ec78 | 1571 | deferred_newlines++; |
45b966db ZW |
1572 | ip++; |
1573 | if (*ip == '\n') ip++; | |
45b966db ZW |
1574 | } |
1575 | else | |
1576 | *op++ = '\\'; | |
04e3ec78 | 1577 | break; |
45b966db ZW |
1578 | |
1579 | case SPECCASE_QUESTION: /* ? */ | |
1580 | { | |
1581 | unsigned int d, t; | |
04e3ec78 NB |
1582 | |
1583 | *op++ = '?'; /* Normal non-trigraph case */ | |
1584 | if (ip[0] != '?') | |
1585 | break; | |
1586 | ||
45b966db | 1587 | d = ip[1]; |
2a87fbe8 ZW |
1588 | t = chartab[d]; |
1589 | if (NONTRI (t)) | |
04e3ec78 | 1590 | break; |
45b966db | 1591 | |
ae79697b | 1592 | if (CPP_OPTION (pfile, warn_trigraphs)) |
45b966db ZW |
1593 | { |
1594 | unsigned long col; | |
1595 | line_base = find_position (line_base, op, &line); | |
1596 | col = op - line_base + 1; | |
ae79697b | 1597 | if (CPP_OPTION (pfile, trigraphs)) |
45b966db | 1598 | cpp_warning_with_line (pfile, line, col, |
04e3ec78 | 1599 | "trigraph ??%c converted to %c", d, t); |
45b966db ZW |
1600 | else |
1601 | cpp_warning_with_line (pfile, line, col, | |
04e3ec78 | 1602 | "trigraph ??%c ignored", d); |
45b966db | 1603 | } |
04e3ec78 NB |
1604 | |
1605 | ip += 2; | |
ae79697b | 1606 | if (CPP_OPTION (pfile, trigraphs)) |
45b966db | 1607 | { |
04e3ec78 | 1608 | op[-1] = t; /* Overwrite '?' */ |
45b966db | 1609 | if (t == '\\') |
04e3ec78 NB |
1610 | { |
1611 | op--; | |
1612 | *--ip = '\\'; | |
1613 | goto do_speccase; /* May need buffer refill */ | |
1614 | } | |
45b966db ZW |
1615 | } |
1616 | else | |
1617 | { | |
45b966db ZW |
1618 | *op++ = '?'; |
1619 | *op++ = d; | |
1620 | } | |
1621 | } | |
04e3ec78 | 1622 | break; |
45b966db ZW |
1623 | } |
1624 | } | |
1625 | } | |
1626 | ||
1627 | if (offset == 0) | |
1628 | return 0; | |
1629 | ||
45b966db ZW |
1630 | if (op[-1] != '\n') |
1631 | { | |
1632 | unsigned long col; | |
1633 | line_base = find_position (line_base, op, &line); | |
1634 | col = op - line_base + 1; | |
1635 | cpp_warning_with_line (pfile, line, col, "no newline at end of file\n"); | |
1636 | if (offset + 1 > len) | |
1637 | { | |
1638 | len += 1; | |
1639 | if (offset + 1 > len) | |
1640 | goto too_big; | |
1641 | buf = (U_CHAR *) xrealloc (buf, len); | |
1642 | op = buf + offset; | |
1643 | } | |
1644 | *op++ = '\n'; | |
1645 | } | |
1646 | ||
1647 | fp->buf = ((len - offset < 20) ? buf : (U_CHAR *)xrealloc (buf, op - buf)); | |
1648 | return op - buf; | |
1649 | ||
1650 | too_big: | |
1651 | cpp_error (pfile, "file is too large (>%lu bytes)\n", (unsigned long)offset); | |
1652 | free (buf); | |
1653 | return -1; | |
1654 | ||
1655 | error: | |
1656 | cpp_error_from_errno (pfile, fp->ihash->name); | |
1657 | free (buf); | |
1658 | return -1; | |
1659 | } | |
1660 | ||
2a87fbe8 ZW |
1661 | /* Allocate pfile->input_buffer, and initialize chartab[] |
1662 | if it hasn't happened already. */ | |
46d07497 | 1663 | |
45b966db ZW |
1664 | void |
1665 | _cpp_init_input_buffer (pfile) | |
1666 | cpp_reader *pfile; | |
1667 | { | |
1668 | U_CHAR *tmp; | |
1669 | ||
2a87fbe8 | 1670 | init_chartab (); |
04e3ec78 | 1671 | |
45b966db ZW |
1672 | /* Determine the appropriate size for the input buffer. Normal C |
1673 | source files are smaller than eight K. */ | |
04e3ec78 NB |
1674 | /* 8Kbytes of buffer proper, 1 to detect running off the end without |
1675 | address arithmetic all the time, and 3 for pushback during buffer | |
1676 | refill, in case there's a potential trigraph or end-of-line | |
1677 | digraph at the end of a block. */ | |
45b966db | 1678 | |
04e3ec78 | 1679 | tmp = (U_CHAR *) xmalloc (8192 + 1 + 3); |
45b966db ZW |
1680 | pfile->input_buffer = tmp; |
1681 | pfile->input_buffer_len = 8192; | |
1682 | } |