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Commit | Line | Data |
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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 | |
c5a04734 | 7 | Single-pass line tokenization by Neil Booth, April 2000 |
45b966db ZW |
8 | |
9 | This program is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU General Public License as published by the | |
11 | Free Software Foundation; either version 2, or (at your option) any | |
12 | later version. | |
13 | ||
14 | This program 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 this program; if not, write to the Free Software | |
21 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
22 | ||
041c3194 ZW |
23 | /* |
24 | ||
25 | Cleanups to do:- | |
26 | ||
041c3194 ZW |
27 | o -dM and with _cpp_dump_list: too many \n output. |
28 | o Put a printer object in cpp_reader? | |
29 | o Check line numbers assigned to all errors. | |
30 | o Replace strncmp with memcmp almost everywhere. | |
31 | o lex_line's use of cur_token, flags and list->token_used is a bit opaque. | |
041c3194 ZW |
32 | o Convert do_ functions to return void. Kaveh thinks its OK; and said he'll |
33 | give it a run when we've got some code. | |
041c3194 ZW |
34 | o Distinguish integers, floats, and 'other' pp-numbers. |
35 | o Store ints and char constants as binary values. | |
36 | o New command-line assertion syntax. | |
041c3194 ZW |
37 | o Work towards functions in cpperror.c taking a message level parameter. |
38 | If we do this, merge the common code of do_warning and do_error. | |
39 | o Comment all functions, and describe macro expansion algorithm. | |
40 | o Move as much out of header files as possible. | |
41 | o Remove single quote pairs `', and some '', from diagnostics. | |
42 | o Correct pastability test for CPP_NAME and CPP_NUMBER. | |
43 | ||
44 | */ | |
45 | ||
45b966db ZW |
46 | #include "config.h" |
47 | #include "system.h" | |
48 | #include "intl.h" | |
49 | #include "cpplib.h" | |
50 | #include "cpphash.h" | |
041c3194 | 51 | #include "symcat.h" |
45b966db | 52 | |
041c3194 ZW |
53 | #define auto_expand_name_space(list) \ |
54 | _cpp_expand_name_space ((list), 1 + (list)->name_cap / 2) | |
f2d5f0cc ZW |
55 | static void safe_fwrite PARAMS ((cpp_reader *, const U_CHAR *, |
56 | size_t, FILE *)); | |
041c3194 | 57 | static void dump_param_spelling PARAMS ((cpp_reader *, const cpp_toklist *, |
1368ee70 | 58 | unsigned int)); |
041c3194 | 59 | static void output_line_command PARAMS ((cpp_reader *, cpp_printer *, |
9e62c811 | 60 | unsigned int)); |
f2d5f0cc | 61 | |
041c3194 ZW |
62 | static void process_directive PARAMS ((cpp_reader *, const cpp_token *)); |
63 | static unsigned char *trigraph_replace PARAMS ((cpp_reader *, unsigned char *, | |
b8f41010 NB |
64 | unsigned char *)); |
65 | static const unsigned char *backslash_start PARAMS ((cpp_reader *, | |
66 | const unsigned char *)); | |
041c3194 ZW |
67 | static int skip_block_comment PARAMS ((cpp_reader *)); |
68 | static int skip_line_comment PARAMS ((cpp_reader *)); | |
b8f41010 | 69 | static void skip_whitespace PARAMS ((cpp_reader *, int)); |
bfb9dc7f ZW |
70 | static const U_CHAR *parse_name PARAMS ((cpp_reader *, cpp_token *, |
71 | const U_CHAR *, const U_CHAR *)); | |
72 | static void parse_number PARAMS ((cpp_reader *, cpp_toklist *, cpp_string *)); | |
041c3194 ZW |
73 | static void parse_string PARAMS ((cpp_reader *, cpp_toklist *, cpp_token *, |
74 | unsigned int)); | |
b8f41010 | 75 | static int trigraph_ok PARAMS ((cpp_reader *, const unsigned char *)); |
f624ffa7 NB |
76 | static void save_comment PARAMS ((cpp_toklist *, cpp_token *, |
77 | const unsigned char *, | |
ad265aa4 | 78 | unsigned int, unsigned int)); |
041c3194 ZW |
79 | static void lex_line PARAMS ((cpp_reader *, cpp_toklist *)); |
80 | static int lex_next PARAMS ((cpp_reader *, int)); | |
81 | static int is_macro_disabled PARAMS ((cpp_reader *, const cpp_toklist *, | |
82 | const cpp_token *)); | |
b8f41010 | 83 | |
041c3194 ZW |
84 | static cpp_token *stringify_arg PARAMS ((cpp_reader *, const cpp_token *)); |
85 | static void expand_context_stack PARAMS ((cpp_reader *)); | |
d1d9a6bd | 86 | static unsigned char * spell_token PARAMS ((cpp_reader *, const cpp_token *, |
041c3194 ZW |
87 | unsigned char *)); |
88 | static void output_token PARAMS ((cpp_reader *, const cpp_token *, | |
89 | const cpp_token *)); | |
b8f41010 NB |
90 | typedef unsigned int (* speller) PARAMS ((unsigned char *, cpp_toklist *, |
91 | cpp_token *)); | |
041c3194 ZW |
92 | static cpp_token *make_string_token PARAMS ((cpp_token *, const U_CHAR *, |
93 | unsigned int)); | |
94 | static cpp_token *alloc_number_token PARAMS ((cpp_reader *, int number)); | |
95 | static const cpp_token *special_symbol PARAMS ((cpp_reader *, cpp_hashnode *, | |
96 | const cpp_token *)); | |
97 | static cpp_token *duplicate_token PARAMS ((cpp_reader *, const cpp_token *)); | |
98 | static const cpp_token *maybe_paste_with_next PARAMS ((cpp_reader *, | |
99 | const cpp_token *)); | |
100 | static enum cpp_ttype can_paste PARAMS ((cpp_reader *, const cpp_token *, | |
101 | const cpp_token *, int *)); | |
102 | static unsigned int prevent_macro_expansion PARAMS ((cpp_reader *)); | |
103 | static void restore_macro_expansion PARAMS ((cpp_reader *, unsigned int)); | |
104 | static cpp_token *get_temp_token PARAMS ((cpp_reader *)); | |
105 | static void release_temp_tokens PARAMS ((cpp_reader *)); | |
106 | static U_CHAR * quote_string PARAMS ((U_CHAR *, const U_CHAR *, unsigned int)); | |
107 | static void process_directive PARAMS ((cpp_reader *, const cpp_token *)); | |
b8f41010 | 108 | |
bfb9dc7f ZW |
109 | #define INIT_TOKEN_STR(list, token) \ |
110 | do {(token)->val.str.len = 0; \ | |
111 | (token)->val.str.text = (list)->namebuf + (list)->name_used; \ | |
d1d9a6bd | 112 | } while (0) |
b8f41010 | 113 | |
041c3194 ZW |
114 | #define VALID_SIGN(c, prevc) \ |
115 | (((c) == '+' || (c) == '-') && \ | |
116 | ((prevc) == 'e' || (prevc) == 'E' \ | |
117 | || (((prevc) == 'p' || (prevc) == 'P') && !CPP_OPTION (pfile, c89)))) | |
118 | ||
b8f41010 NB |
119 | /* Handle LF, CR, CR-LF and LF-CR style newlines. Assumes next |
120 | character, if any, is in buffer. */ | |
041c3194 | 121 | |
b8f41010 | 122 | #define handle_newline(cur, limit, c) \ |
041c3194 | 123 | do { \ |
b8f41010 NB |
124 | if ((cur) < (limit) && *(cur) == '\r' + '\n' - c) \ |
125 | (cur)++; \ | |
041c3194 ZW |
126 | pfile->buffer->lineno++; \ |
127 | pfile->buffer->line_base = (cur); \ | |
6ab3e7dd | 128 | pfile->col_adjust = 0; \ |
041c3194 | 129 | } while (0) |
b8f41010 | 130 | |
041c3194 | 131 | #define IMMED_TOKEN() (!(cur_token->flags & PREV_WHITE)) |
b8f41010 NB |
132 | #define PREV_TOKEN_TYPE (cur_token[-1].type) |
133 | ||
f617b8e2 NB |
134 | #define PUSH_TOKEN(ttype) cur_token++->type = ttype |
135 | #define REVISE_TOKEN(ttype) cur_token[-1].type = ttype | |
136 | #define BACKUP_TOKEN(ttype) (--cur_token)->type = ttype | |
137 | #define BACKUP_DIGRAPH(ttype) do { \ | |
138 | BACKUP_TOKEN(ttype); cur_token->flags |= DIGRAPH;} while (0) | |
139 | ||
140 | /* An upper bound on the number of bytes needed to spell a token, | |
141 | including preceding whitespace. */ | |
bfb9dc7f ZW |
142 | #define TOKEN_SPELL(token) token_spellings[(token)->type].type |
143 | #define TOKEN_LEN(token) (5 + (TOKEN_SPELL(token) == SPELL_STRING \ | |
144 | ? (token)->val.str.len \ | |
145 | : (TOKEN_SPELL(token) == SPELL_IDENT \ | |
146 | ? (token)->val.node->length \ | |
147 | : 0))) | |
f617b8e2 | 148 | |
f617b8e2 | 149 | #define T(e, s) {SPELL_OPERATOR, (const U_CHAR *) s}, |
5d7ee2fa NB |
150 | #define I(e, s) {SPELL_IDENT, s}, |
151 | #define S(e, s) {SPELL_STRING, s}, | |
b8f41010 NB |
152 | #define C(e, s) {SPELL_CHAR, s}, |
153 | #define N(e, s) {SPELL_NONE, s}, | |
b8f41010 | 154 | |
041c3194 ZW |
155 | const struct token_spelling |
156 | token_spellings [N_TTYPES + 1] = {TTYPE_TABLE {0, 0} }; | |
157 | ||
158 | #undef T | |
159 | #undef I | |
160 | #undef S | |
161 | #undef C | |
162 | #undef N | |
163 | ||
164 | /* For debugging: the internal names of the tokens. */ | |
b449f23a KG |
165 | #define T(e, s) U STRINGX(e), |
166 | #define I(e, s) U STRINGX(e), | |
167 | #define S(e, s) U STRINGX(e), | |
168 | #define C(e, s) U STRINGX(e), | |
169 | #define N(e, s) U STRINGX(e), | |
041c3194 | 170 | |
cf00a885 | 171 | const U_CHAR *const token_names[N_TTYPES] = { TTYPE_TABLE }; |
b8f41010 NB |
172 | |
173 | #undef T | |
5d7ee2fa NB |
174 | #undef I |
175 | #undef S | |
b8f41010 NB |
176 | #undef C |
177 | #undef N | |
b8f41010 | 178 | |
041c3194 ZW |
179 | /* The following table is used by trigraph_ok/trigraph_replace. If we |
180 | have designated initializers, it can be constant data; otherwise, | |
181 | it is set up at runtime by _cpp_init_input_buffer. */ | |
182 | ||
183 | #if (GCC_VERSION >= 2007) | |
184 | #define init_trigraph_map() /* nothing */ | |
185 | #define TRIGRAPH_MAP \ | |
186 | __extension__ static const U_CHAR trigraph_map[UCHAR_MAX + 1] = { | |
187 | #define END }; | |
188 | #define s(p, v) [p] = v, | |
189 | #else | |
190 | #define TRIGRAPH_MAP static U_CHAR trigraph_map[UCHAR_MAX + 1] = { 0 }; \ | |
191 | static void init_trigraph_map PARAMS ((void)) { \ | |
192 | unsigned char *x = trigraph_map; | |
193 | #define END } | |
194 | #define s(p, v) x[p] = v; | |
195 | #endif | |
196 | ||
197 | TRIGRAPH_MAP | |
198 | s('=', '#') s(')', ']') s('!', '|') | |
199 | s('(', '[') s('\'', '^') s('>', '}') | |
200 | s('/', '\\') s('<', '{') s('-', '~') | |
201 | END | |
202 | ||
203 | #undef TRIGRAPH_MAP | |
204 | #undef END | |
205 | #undef s | |
206 | ||
45b966db ZW |
207 | /* Re-allocates PFILE->token_buffer so it will hold at least N more chars. */ |
208 | ||
209 | void | |
210 | _cpp_grow_token_buffer (pfile, n) | |
211 | cpp_reader *pfile; | |
212 | long n; | |
213 | { | |
214 | long old_written = CPP_WRITTEN (pfile); | |
215 | pfile->token_buffer_size = n + 2 * pfile->token_buffer_size; | |
216 | pfile->token_buffer = (U_CHAR *) | |
217 | xrealloc(pfile->token_buffer, pfile->token_buffer_size); | |
218 | CPP_SET_WRITTEN (pfile, old_written); | |
219 | } | |
220 | ||
f2d5f0cc ZW |
221 | /* Deal with the annoying semantics of fwrite. */ |
222 | static void | |
223 | safe_fwrite (pfile, buf, len, fp) | |
224 | cpp_reader *pfile; | |
225 | const U_CHAR *buf; | |
226 | size_t len; | |
227 | FILE *fp; | |
228 | { | |
229 | size_t count; | |
45b966db | 230 | |
f2d5f0cc ZW |
231 | while (len) |
232 | { | |
233 | count = fwrite (buf, 1, len, fp); | |
234 | if (count == 0) | |
235 | goto error; | |
236 | len -= count; | |
237 | buf += count; | |
238 | } | |
239 | return; | |
240 | ||
241 | error: | |
242 | cpp_notice_from_errno (pfile, CPP_OPTION (pfile, out_fname)); | |
243 | } | |
244 | ||
245 | /* Notify the compiler proper that the current line number has jumped, | |
246 | or the current file name has changed. */ | |
247 | ||
248 | static void | |
1368ee70 | 249 | output_line_command (pfile, print, line) |
45b966db | 250 | cpp_reader *pfile; |
f2d5f0cc | 251 | cpp_printer *print; |
1368ee70 | 252 | unsigned int line; |
45b966db | 253 | { |
041c3194 | 254 | cpp_buffer *ip = CPP_BUFFER (pfile); |
f2d5f0cc ZW |
255 | enum { same = 0, enter, leave, rname } change; |
256 | static const char * const codes[] = { "", " 1", " 2", "" }; | |
257 | ||
041c3194 ZW |
258 | if (line == 0) |
259 | return; | |
260 | ||
261 | /* End the previous line of text. */ | |
262 | if (pfile->need_newline) | |
263 | putc ('\n', print->outf); | |
264 | pfile->need_newline = 0; | |
265 | ||
f2d5f0cc ZW |
266 | if (CPP_OPTION (pfile, no_line_commands)) |
267 | return; | |
268 | ||
041c3194 ZW |
269 | /* If ip is null, we've been called from cpp_finish, and they just |
270 | needed the final flush and trailing newline. */ | |
271 | if (!ip) | |
272 | return; | |
273 | ||
fb753f88 | 274 | if (pfile->include_depth == print->last_id) |
54bef41d | 275 | { |
fb753f88 JJ |
276 | /* Determine whether the current filename has changed, and if so, |
277 | how. 'nominal_fname' values are unique, so they can be compared | |
278 | by comparing pointers. */ | |
279 | if (ip->nominal_fname == print->last_fname) | |
280 | change = same; | |
281 | else | |
0e500c78 | 282 | change = rname; |
fb753f88 JJ |
283 | } |
284 | else | |
285 | { | |
286 | if (pfile->include_depth > print->last_id) | |
287 | change = enter; | |
f2d5f0cc | 288 | else |
fb753f88 JJ |
289 | change = leave; |
290 | print->last_id = pfile->include_depth; | |
45b966db | 291 | } |
fb753f88 JJ |
292 | print->last_fname = ip->nominal_fname; |
293 | ||
f2d5f0cc ZW |
294 | /* If the current file has not changed, we can output a few newlines |
295 | instead if we want to increase the line number by a small amount. | |
296 | We cannot do this if print->lineno is zero, because that means we | |
297 | haven't output any line commands yet. (The very first line | |
298 | command output is a `same_file' command.) */ | |
041c3194 | 299 | if (change == same && print->lineno > 0 |
f2d5f0cc | 300 | && line >= print->lineno && line < print->lineno + 8) |
45b966db | 301 | { |
f2d5f0cc | 302 | while (line > print->lineno) |
45b966db | 303 | { |
f2d5f0cc ZW |
304 | putc ('\n', print->outf); |
305 | print->lineno++; | |
45b966db | 306 | } |
f2d5f0cc | 307 | return; |
45b966db | 308 | } |
f2d5f0cc ZW |
309 | |
310 | #ifndef NO_IMPLICIT_EXTERN_C | |
311 | if (CPP_OPTION (pfile, cplusplus)) | |
312 | fprintf (print->outf, "# %u \"%s\"%s%s%s\n", line, ip->nominal_fname, | |
313 | codes[change], | |
c31a6508 ZW |
314 | ip->inc->sysp ? " 3" : "", |
315 | (ip->inc->sysp == 2) ? " 4" : ""); | |
f2d5f0cc ZW |
316 | else |
317 | #endif | |
318 | fprintf (print->outf, "# %u \"%s\"%s%s\n", line, ip->nominal_fname, | |
319 | codes[change], | |
c31a6508 | 320 | ip->inc->sysp ? " 3" : ""); |
f2d5f0cc ZW |
321 | print->lineno = line; |
322 | } | |
323 | ||
324 | /* Write the contents of the token_buffer to the output stream, and | |
325 | clear the token_buffer. Also handles generating line commands and | |
326 | keeping track of file transitions. */ | |
327 | ||
328 | void | |
041c3194 | 329 | cpp_output_tokens (pfile, print, line) |
f2d5f0cc ZW |
330 | cpp_reader *pfile; |
331 | cpp_printer *print; | |
041c3194 | 332 | unsigned int line; |
f2d5f0cc | 333 | { |
f6fab919 ZW |
334 | if (CPP_WRITTEN (pfile) - print->written) |
335 | { | |
f6fab919 ZW |
336 | safe_fwrite (pfile, pfile->token_buffer, |
337 | CPP_WRITTEN (pfile) - print->written, print->outf); | |
041c3194 ZW |
338 | pfile->need_newline = 1; |
339 | if (print->lineno) | |
340 | print->lineno++; | |
45b966db | 341 | |
041c3194 | 342 | CPP_SET_WRITTEN (pfile, print->written); |
f2d5f0cc | 343 | } |
041c3194 | 344 | output_line_command (pfile, print, line); |
45b966db ZW |
345 | } |
346 | ||
c56c2073 | 347 | /* Scan until CPP_BUFFER (PFILE) is exhausted, discarding output. */ |
f2d5f0cc ZW |
348 | |
349 | void | |
350 | cpp_scan_buffer_nooutput (pfile) | |
351 | cpp_reader *pfile; | |
352 | { | |
f2d5f0cc | 353 | unsigned int old_written = CPP_WRITTEN (pfile); |
041c3194 ZW |
354 | cpp_buffer *stop = CPP_PREV_BUFFER (CPP_BUFFER (pfile)); |
355 | ||
f2d5f0cc ZW |
356 | for (;;) |
357 | { | |
041c3194 ZW |
358 | /* In no-output mode, we can ignore everything but directives. */ |
359 | const cpp_token *token = cpp_get_token (pfile); | |
360 | if (token->type == CPP_EOF) | |
361 | { | |
362 | cpp_pop_buffer (pfile); | |
363 | if (CPP_BUFFER (pfile) == stop) | |
364 | break; | |
365 | } | |
366 | _cpp_skip_rest_of_line (pfile); | |
f2d5f0cc ZW |
367 | } |
368 | CPP_SET_WRITTEN (pfile, old_written); | |
369 | } | |
370 | ||
c56c2073 | 371 | /* Scan until CPP_BUFFER (pfile) is exhausted, writing output to PRINT. */ |
f2d5f0cc ZW |
372 | |
373 | void | |
374 | cpp_scan_buffer (pfile, print) | |
375 | cpp_reader *pfile; | |
376 | cpp_printer *print; | |
377 | { | |
c56c2073 | 378 | cpp_buffer *stop = CPP_PREV_BUFFER (CPP_BUFFER (pfile)); |
041c3194 | 379 | const cpp_token *token, *prev = 0; |
f2d5f0cc ZW |
380 | |
381 | for (;;) | |
382 | { | |
383 | token = cpp_get_token (pfile); | |
041c3194 | 384 | if (token->type == CPP_EOF) |
f2d5f0cc | 385 | { |
041c3194 ZW |
386 | cpp_pop_buffer (pfile); |
387 | if (CPP_BUFFER (pfile) == stop) | |
f2d5f0cc | 388 | return; |
041c3194 ZW |
389 | cpp_output_tokens (pfile, print, CPP_BUF_LINE (CPP_BUFFER (pfile))); |
390 | prev = 0; | |
391 | continue; | |
392 | } | |
393 | ||
394 | if (token->flags & BOL) | |
395 | { | |
396 | cpp_output_tokens (pfile, print, pfile->token_list.line); | |
397 | prev = 0; | |
f2d5f0cc | 398 | } |
041c3194 ZW |
399 | |
400 | output_token (pfile, token, prev); | |
401 | prev = token; | |
f2d5f0cc ZW |
402 | } |
403 | } | |
404 | ||
041c3194 ZW |
405 | /* Helper routine used by parse_include, which can't see spell_token. |
406 | Reinterpret the current line as an h-char-sequence (< ... >); we are | |
407 | looking at the first token after the <. */ | |
408 | const cpp_token * | |
409 | _cpp_glue_header_name (pfile) | |
45b966db ZW |
410 | cpp_reader *pfile; |
411 | { | |
041c3194 ZW |
412 | unsigned int written = CPP_WRITTEN (pfile); |
413 | const cpp_token *t; | |
414 | cpp_token *hdr; | |
415 | U_CHAR *buf; | |
416 | size_t len; | |
417 | ||
418 | for (;;) | |
419 | { | |
420 | t = cpp_get_token (pfile); | |
421 | if (t->type == CPP_GREATER || t->type == CPP_EOF) | |
422 | break; | |
423 | ||
424 | CPP_RESERVE (pfile, TOKEN_LEN (t)); | |
425 | if (t->flags & PREV_WHITE) | |
426 | CPP_PUTC_Q (pfile, ' '); | |
427 | pfile->limit = spell_token (pfile, t, pfile->limit); | |
428 | } | |
429 | ||
430 | if (t->type == CPP_EOF) | |
431 | cpp_error (pfile, "missing terminating > character"); | |
45b966db | 432 | |
041c3194 ZW |
433 | len = CPP_WRITTEN (pfile) - written; |
434 | buf = xmalloc (len); | |
435 | memcpy (buf, pfile->token_buffer + written, len); | |
436 | CPP_SET_WRITTEN (pfile, written); | |
437 | ||
438 | hdr = get_temp_token (pfile); | |
439 | hdr->type = CPP_HEADER_NAME; | |
440 | hdr->flags = 0; | |
bfb9dc7f ZW |
441 | hdr->val.str.text = buf; |
442 | hdr->val.str.len = len; | |
041c3194 | 443 | return hdr; |
45b966db ZW |
444 | } |
445 | ||
1368ee70 ZW |
446 | /* Token-buffer helper functions. */ |
447 | ||
d1d9a6bd NB |
448 | /* Expand a token list's string space. It is *vital* that |
449 | list->tokens_used is correct, to get pointer fix-up right. */ | |
041c3194 ZW |
450 | void |
451 | _cpp_expand_name_space (list, len) | |
1368ee70 | 452 | cpp_toklist *list; |
c5a04734 ZW |
453 | unsigned int len; |
454 | { | |
f617b8e2 | 455 | const U_CHAR *old_namebuf; |
f617b8e2 NB |
456 | |
457 | old_namebuf = list->namebuf; | |
c5a04734 ZW |
458 | list->name_cap += len; |
459 | list->namebuf = (unsigned char *) xrealloc (list->namebuf, list->name_cap); | |
f617b8e2 NB |
460 | |
461 | /* Fix up token text pointers. */ | |
79f50f2a | 462 | if (list->namebuf != old_namebuf) |
f617b8e2 NB |
463 | { |
464 | unsigned int i; | |
465 | ||
466 | for (i = 0; i < list->tokens_used; i++) | |
bfb9dc7f ZW |
467 | if (token_spellings[list->tokens[i].type].type == SPELL_STRING) |
468 | list->tokens[i].val.str.text += (list->namebuf - old_namebuf); | |
f617b8e2 | 469 | } |
1368ee70 ZW |
470 | } |
471 | ||
041c3194 ZW |
472 | /* If there is not enough room for LEN more characters, expand the |
473 | list by just enough to have room for LEN characters. */ | |
474 | void | |
475 | _cpp_reserve_name_space (list, len) | |
476 | cpp_toklist *list; | |
477 | unsigned int len; | |
478 | { | |
479 | unsigned int room = list->name_cap - list->name_used; | |
480 | ||
481 | if (room < len) | |
482 | _cpp_expand_name_space (list, len - room); | |
483 | } | |
484 | ||
1368ee70 | 485 | /* Expand the number of tokens in a list. */ |
d1d9a6bd NB |
486 | void |
487 | _cpp_expand_token_space (list, count) | |
1368ee70 | 488 | cpp_toklist *list; |
d1d9a6bd | 489 | unsigned int count; |
1368ee70 | 490 | { |
d1d9a6bd NB |
491 | unsigned int n; |
492 | ||
493 | list->tokens_cap += count; | |
494 | n = list->tokens_cap; | |
15dad1d9 | 495 | if (list->flags & LIST_OFFSET) |
d1d9a6bd | 496 | list->tokens--, n++; |
1368ee70 | 497 | list->tokens = (cpp_token *) |
d1d9a6bd | 498 | xrealloc (list->tokens, n * sizeof (cpp_token)); |
15dad1d9 ZW |
499 | if (list->flags & LIST_OFFSET) |
500 | list->tokens++; /* Skip the dummy. */ | |
1368ee70 ZW |
501 | } |
502 | ||
d1d9a6bd NB |
503 | /* Initialize a token list. If flags is DUMMY_TOKEN, we allocate |
504 | an extra token in front of the token list, as this allows the lexer | |
505 | to always peek at the previous token without worrying about | |
506 | underflowing the list, and some initial space. Otherwise, no | |
507 | token- or name-space is allocated, and there is no dummy token. */ | |
15dad1d9 | 508 | void |
d1d9a6bd | 509 | _cpp_init_toklist (list, flags) |
1368ee70 | 510 | cpp_toklist *list; |
d1d9a6bd | 511 | int flags; |
1368ee70 | 512 | { |
d1d9a6bd NB |
513 | if (flags == NO_DUMMY_TOKEN) |
514 | { | |
515 | list->tokens_cap = 0; | |
041c3194 | 516 | list->tokens = 0; |
d1d9a6bd | 517 | list->name_cap = 0; |
041c3194 | 518 | list->namebuf = 0; |
d1d9a6bd NB |
519 | list->flags = 0; |
520 | } | |
521 | else | |
522 | { | |
523 | /* Initialize token space. Put a dummy token before the start | |
524 | that will fail matches. */ | |
525 | list->tokens_cap = 256; /* 4K's worth. */ | |
526 | list->tokens = (cpp_token *) | |
527 | xmalloc ((list->tokens_cap + 1) * sizeof (cpp_token)); | |
528 | list->tokens[0].type = CPP_EOF; | |
529 | list->tokens++; | |
530 | ||
531 | /* Initialize name space. */ | |
532 | list->name_cap = 1024; | |
041c3194 | 533 | list->namebuf = (unsigned char *) xmalloc (list->name_cap); |
d1d9a6bd NB |
534 | list->flags = LIST_OFFSET; |
535 | } | |
15dad1d9 | 536 | |
15dad1d9 ZW |
537 | _cpp_clear_toklist (list); |
538 | } | |
1368ee70 | 539 | |
15dad1d9 ZW |
540 | /* Clear a token list. */ |
541 | void | |
542 | _cpp_clear_toklist (list) | |
543 | cpp_toklist *list; | |
544 | { | |
c5a04734 ZW |
545 | list->tokens_used = 0; |
546 | list->name_used = 0; | |
041c3194 ZW |
547 | list->directive = 0; |
548 | list->paramc = 0; | |
549 | list->params_len = 0; | |
15dad1d9 ZW |
550 | list->flags &= LIST_OFFSET; /* clear all but that one */ |
551 | } | |
552 | ||
553 | /* Free a token list. Does not free the list itself, which may be | |
554 | embedded in a larger structure. */ | |
555 | void | |
556 | _cpp_free_toklist (list) | |
041c3194 | 557 | const cpp_toklist *list; |
15dad1d9 | 558 | { |
15dad1d9 ZW |
559 | if (list->flags & LIST_OFFSET) |
560 | free (list->tokens - 1); /* Backup over dummy token. */ | |
561 | else | |
562 | free (list->tokens); | |
563 | free (list->namebuf); | |
1368ee70 ZW |
564 | } |
565 | ||
15dad1d9 ZW |
566 | /* Compare two tokens. */ |
567 | int | |
568 | _cpp_equiv_tokens (a, b) | |
569 | const cpp_token *a, *b; | |
570 | { | |
041c3194 ZW |
571 | if (a->type == b->type && a->flags == b->flags) |
572 | switch (token_spellings[a->type].type) | |
573 | { | |
574 | default: /* Keep compiler happy. */ | |
575 | case SPELL_OPERATOR: | |
576 | return 1; | |
577 | case SPELL_CHAR: | |
578 | case SPELL_NONE: | |
579 | return a->val.aux == b->val.aux; /* arg_no or character. */ | |
580 | case SPELL_IDENT: | |
bfb9dc7f | 581 | return a->val.node == b->val.node; |
041c3194 | 582 | case SPELL_STRING: |
bfb9dc7f ZW |
583 | return (a->val.str.len == b->val.str.len |
584 | && !memcmp (a->val.str.text, b->val.str.text, | |
585 | a->val.str.len)); | |
041c3194 | 586 | } |
15dad1d9 | 587 | |
041c3194 | 588 | return 0; |
15dad1d9 ZW |
589 | } |
590 | ||
591 | /* Compare two token lists. */ | |
592 | int | |
593 | _cpp_equiv_toklists (a, b) | |
594 | const cpp_toklist *a, *b; | |
595 | { | |
596 | unsigned int i; | |
597 | ||
041c3194 ZW |
598 | if (a->tokens_used != b->tokens_used |
599 | || a->flags != b->flags | |
600 | || a->paramc != b->paramc) | |
15dad1d9 ZW |
601 | return 0; |
602 | ||
603 | for (i = 0; i < a->tokens_used; i++) | |
604 | if (! _cpp_equiv_tokens (&a->tokens[i], &b->tokens[i])) | |
605 | return 0; | |
606 | return 1; | |
607 | } | |
608 | ||
041c3194 | 609 | /* Utility routine: |
9e62c811 | 610 | |
bfb9dc7f ZW |
611 | Compares, the token TOKEN to the NUL-terminated string STRING. |
612 | TOKEN must be a CPP_NAME. Returns 1 for equal, 0 for unequal. */ | |
15dad1d9 | 613 | |
041c3194 | 614 | int |
bfb9dc7f ZW |
615 | cpp_ideq (token, string) |
616 | const cpp_token *token; | |
041c3194 ZW |
617 | const char *string; |
618 | { | |
bfb9dc7f | 619 | if (token->type != CPP_NAME) |
041c3194 | 620 | return 0; |
bfb9dc7f ZW |
621 | |
622 | return !ustrcmp (token->val.node->name, (const U_CHAR *)string); | |
15dad1d9 | 623 | } |
1368ee70 | 624 | |
041c3194 | 625 | /* Lexing algorithm. |
45b966db | 626 | |
041c3194 ZW |
627 | The original lexer in cpplib was made up of two passes: a first pass |
628 | that replaced trigraphs and deleted esacped newlines, and a second | |
629 | pass that tokenized the result of the first pass. Tokenisation was | |
630 | performed by peeking at the next character in the input stream. For | |
631 | example, if the input stream contained "!=", the handler for the ! | |
632 | character would peek at the next character, and if it were a '=' | |
633 | would skip over it, and return a "!=" token, otherwise it would | |
634 | return just the "!" token. | |
61474454 | 635 | |
041c3194 ZW |
636 | To implement a single-pass lexer, this peeking ahead is unworkable. |
637 | An arbitrary number of escaped newlines, and trigraphs (in particular | |
638 | ??/ which translates to the escape \), could separate the '!' and '=' | |
639 | in the input stream, yet the next token is still a "!=". | |
61474454 | 640 | |
041c3194 ZW |
641 | Suppose instead that we lex by one logical line at a time, producing |
642 | a token list or stack for each logical line, and when seeing the '!' | |
643 | push a CPP_NOT token on the list. Then if the '!' is part of a | |
644 | longer token ("!=") we know we must see the remainder of the token by | |
645 | the time we reach the end of the logical line. Thus we can have the | |
646 | '=' handler look at the previous token (at the end of the list / top | |
647 | of the stack) and see if it is a "!" token, and if so, instead of | |
648 | pushing a "=" token revise the existing token to be a "!=" token. | |
61474454 | 649 | |
041c3194 ZW |
650 | This works in the presence of escaped newlines, because the '\' would |
651 | have been pushed on the top of the stack as a CPP_BACKSLASH. The | |
652 | newline ('\n' or '\r') handler looks at the token at the top of the | |
653 | stack to see if it is a CPP_BACKSLASH, and if so discards both. | |
654 | Otherwise it pushes the newline (CPP_VSPACE) token as normal. Hence | |
655 | the '=' handler would never see any intervening escaped newlines. | |
45b966db | 656 | |
041c3194 ZW |
657 | To make trigraphs work in this context, as in precedence trigraphs |
658 | are highest and converted before anything else, the '?' handler does | |
659 | lookahead to see if it is a trigraph, and if so skips the trigraph | |
660 | and pushes the token it represents onto the top of the stack. This | |
661 | also works in the particular case of a CPP_BACKSLASH trigraph. | |
45b966db | 662 | |
041c3194 ZW |
663 | To the preprocessor, whitespace is only significant to the point of |
664 | knowing whether whitespace precedes a particular token. For example, | |
665 | the '=' handler needs to know whether there was whitespace between it | |
666 | and a "!" token on the top of the stack, to make the token conversion | |
667 | decision correctly. So each token has a PREV_WHITE flag to | |
668 | indicate this - the standard permits consecutive whitespace to be | |
669 | regarded as a single space. The compiler front ends are not | |
670 | interested in whitespace at all; they just require a token stream. | |
671 | Another place where whitespace is significant to the preprocessor is | |
672 | a #define statment - if there is whitespace between the macro name | |
673 | and an initial "(" token the macro is "object-like", otherwise it is | |
674 | a function-like macro that takes arguments. | |
675 | ||
676 | However, all is not rosy. Parsing of identifiers, numbers, comments | |
677 | and strings becomes trickier because of the possibility of raw | |
678 | trigraphs and escaped newlines in the input stream. | |
679 | ||
680 | The trigraphs are three consecutive characters beginning with two | |
681 | question marks. A question mark is not valid as part of a number or | |
682 | identifier, so parsing of a number or identifier terminates normally | |
683 | upon reaching it, returning to the mainloop which handles the | |
684 | trigraph just like it would in any other position. Similarly for the | |
685 | backslash of a backslash-newline combination. So we just need the | |
686 | escaped-newline dropper in the mainloop to check if the token on the | |
687 | top of the stack after dropping the escaped newline is a number or | |
688 | identifier, and if so to continue the processing it as if nothing had | |
689 | happened. | |
690 | ||
691 | For strings, we replace trigraphs whenever we reach a quote or | |
692 | newline, because there might be a backslash trigraph escaping them. | |
693 | We need to be careful that we start trigraph replacing from where we | |
694 | left off previously, because it is possible for a first scan to leave | |
695 | "fake" trigraphs that a second scan would pick up as real (e.g. the | |
696 | sequence "????/\n=" would find a fake ??= trigraph after removing the | |
697 | escaped newline.) | |
698 | ||
699 | For line comments, on reaching a newline we scan the previous | |
700 | character(s) to see if it escaped, and continue if it is. Block | |
701 | comments ignore everything and just focus on finding the comment | |
702 | termination mark. The only difficult thing, and it is surprisingly | |
703 | tricky, is checking if an asterisk precedes the final slash since | |
704 | they could be separated by escaped newlines. If the preprocessor is | |
705 | invoked with the output comments option, we don't bother removing | |
706 | escaped newlines and replacing trigraphs for output. | |
707 | ||
708 | Finally, numbers can begin with a period, which is pushed initially | |
709 | as a CPP_DOT token in its own right. The digit handler checks if the | |
710 | previous token was a CPP_DOT not separated by whitespace, and if so | |
711 | pops it off the stack and pushes a period into the number's buffer | |
712 | before calling the number parser. | |
45b966db | 713 | |
041c3194 ZW |
714 | */ |
715 | ||
716 | static const unsigned char *digraph_spellings [] = {U"%:", U"%:%:", U"<:", | |
717 | U":>", U"<%", U"%>"}; | |
45b966db | 718 | |
041c3194 ZW |
719 | /* Call when a trigraph is encountered. It warns if necessary, and |
720 | returns true if the trigraph should be honoured. END is the third | |
721 | character of a trigraph in the input stream. */ | |
45b966db | 722 | static int |
041c3194 | 723 | trigraph_ok (pfile, end) |
45b966db | 724 | cpp_reader *pfile; |
041c3194 | 725 | const unsigned char *end; |
45b966db | 726 | { |
041c3194 ZW |
727 | int accept = CPP_OPTION (pfile, trigraphs); |
728 | ||
729 | if (CPP_OPTION (pfile, warn_trigraphs)) | |
45b966db | 730 | { |
041c3194 ZW |
731 | unsigned int col = end - 1 - pfile->buffer->line_base; |
732 | if (accept) | |
733 | cpp_warning_with_line (pfile, pfile->buffer->lineno, col, | |
734 | "trigraph ??%c converted to %c", | |
735 | (int) *end, (int) trigraph_map[*end]); | |
45b966db | 736 | else |
041c3194 ZW |
737 | cpp_warning_with_line (pfile, pfile->buffer->lineno, col, |
738 | "trigraph ??%c ignored", (int) *end); | |
45b966db | 739 | } |
041c3194 | 740 | return accept; |
45b966db ZW |
741 | } |
742 | ||
041c3194 ZW |
743 | /* Scan a string for trigraphs, warning or replacing them inline as |
744 | appropriate. When parsing a string, we must call this routine | |
745 | before processing a newline character (if trigraphs are enabled), | |
746 | since the newline might be escaped by a preceding backslash | |
747 | trigraph sequence. Returns a pointer to the end of the name after | |
748 | replacement. */ | |
749 | ||
750 | static unsigned char * | |
751 | trigraph_replace (pfile, src, limit) | |
45b966db | 752 | cpp_reader *pfile; |
041c3194 ZW |
753 | unsigned char *src; |
754 | unsigned char *limit; | |
45b966db | 755 | { |
041c3194 ZW |
756 | unsigned char *dest; |
757 | ||
758 | /* Starting with src[1], find two consecutive '?'. The case of no | |
759 | trigraphs is streamlined. */ | |
760 | ||
043afb2a | 761 | for (src++; src + 1 < limit; src += 2) |
041c3194 ZW |
762 | { |
763 | if (src[0] != '?') | |
764 | continue; | |
765 | ||
766 | /* Make src point to the 1st (NOT 2nd) of two consecutive '?'s. */ | |
767 | if (src[-1] == '?') | |
768 | src--; | |
769 | else if (src + 2 == limit || src[1] != '?') | |
770 | continue; | |
45b966db | 771 | |
041c3194 ZW |
772 | /* Check if it really is a trigraph. */ |
773 | if (trigraph_map[src[2]] == 0) | |
774 | continue; | |
45b966db | 775 | |
041c3194 ZW |
776 | dest = src; |
777 | goto trigraph_found; | |
778 | } | |
779 | return limit; | |
45b966db | 780 | |
041c3194 ZW |
781 | /* Now we have a trigraph, we need to scan the remaining buffer, and |
782 | copy-shifting its contents left if replacement is enabled. */ | |
783 | for (; src + 2 < limit; dest++, src++) | |
784 | if ((*dest = *src) == '?' && src[1] == '?' && trigraph_map[src[2]]) | |
785 | { | |
786 | trigraph_found: | |
787 | src += 2; | |
788 | if (trigraph_ok (pfile, pfile->buffer->cur - (limit - src))) | |
789 | *dest = trigraph_map[*src]; | |
790 | } | |
791 | ||
792 | /* Copy remaining (at most 2) characters. */ | |
793 | while (src < limit) | |
794 | *dest++ = *src++; | |
795 | return dest; | |
45b966db ZW |
796 | } |
797 | ||
041c3194 ZW |
798 | /* If CUR is a backslash or the end of a trigraphed backslash, return |
799 | a pointer to its beginning, otherwise NULL. We don't read beyond | |
800 | the buffer start, because there is the start of the comment in the | |
801 | buffer. */ | |
802 | static const unsigned char * | |
803 | backslash_start (pfile, cur) | |
64aaf407 | 804 | cpp_reader *pfile; |
041c3194 | 805 | const unsigned char *cur; |
64aaf407 | 806 | { |
041c3194 ZW |
807 | if (cur[0] == '\\') |
808 | return cur; | |
809 | if (cur[0] == '/' && cur[-1] == '?' && cur[-2] == '?' | |
810 | && trigraph_ok (pfile, cur)) | |
811 | return cur - 2; | |
812 | return 0; | |
64aaf407 NB |
813 | } |
814 | ||
041c3194 ZW |
815 | /* Skip a C-style block comment. This is probably the trickiest |
816 | handler. We find the end of the comment by seeing if an asterisk | |
817 | is before every '/' we encounter. The nasty complication is that a | |
818 | previous asterisk may be separated by one or more escaped newlines. | |
819 | Returns non-zero if comment terminated by EOF, zero otherwise. */ | |
820 | static int | |
821 | skip_block_comment (pfile) | |
45b966db ZW |
822 | cpp_reader *pfile; |
823 | { | |
041c3194 ZW |
824 | cpp_buffer *buffer = pfile->buffer; |
825 | const unsigned char *char_after_star = 0; | |
826 | register const unsigned char *cur = buffer->cur; | |
827 | int seen_eof = 0; | |
828 | ||
829 | /* Inner loop would think the comment has ended if the first comment | |
830 | character is a '/'. Avoid this and keep the inner loop clean by | |
831 | skipping such a character. */ | |
832 | if (cur < buffer->rlimit && cur[0] == '/') | |
833 | cur++; | |
64aaf407 | 834 | |
041c3194 | 835 | for (; cur < buffer->rlimit; ) |
45b966db | 836 | { |
041c3194 ZW |
837 | unsigned char c = *cur++; |
838 | ||
839 | /* People like decorating comments with '*', so check for | |
840 | '/' instead for efficiency. */ | |
841 | if (c == '/') | |
45b966db | 842 | { |
041c3194 ZW |
843 | if (cur[-2] == '*' || cur - 1 == char_after_star) |
844 | goto out; | |
845 | ||
846 | /* Warn about potential nested comments, but not when | |
847 | the final character inside the comment is a '/'. | |
848 | Don't bother to get it right across escaped newlines. */ | |
849 | if (CPP_OPTION (pfile, warn_comments) && cur + 1 < buffer->rlimit | |
850 | && cur[0] == '*' && cur[1] != '/') | |
45b966db | 851 | { |
041c3194 ZW |
852 | buffer->cur = cur; |
853 | cpp_warning (pfile, "'/*' within comment"); | |
45b966db | 854 | } |
45b966db | 855 | } |
91fcd158 | 856 | else if (is_vspace (c)) |
45b966db | 857 | { |
041c3194 ZW |
858 | const unsigned char* bslash = backslash_start (pfile, cur - 2); |
859 | ||
860 | handle_newline (cur, buffer->rlimit, c); | |
861 | /* Work correctly if there is an asterisk before an | |
862 | arbirtrarily long sequence of escaped newlines. */ | |
863 | if (bslash && (bslash[-1] == '*' || bslash == char_after_star)) | |
864 | char_after_star = cur; | |
865 | else | |
866 | char_after_star = 0; | |
45b966db | 867 | } |
45b966db | 868 | } |
041c3194 ZW |
869 | seen_eof = 1; |
870 | ||
64aaf407 | 871 | out: |
041c3194 ZW |
872 | buffer->cur = cur; |
873 | return seen_eof; | |
45b966db ZW |
874 | } |
875 | ||
041c3194 ZW |
876 | /* Skip a C++ or Chill line comment. Handles escaped newlines. |
877 | Returns non-zero if a multiline comment. */ | |
878 | static int | |
879 | skip_line_comment (pfile) | |
45b966db ZW |
880 | cpp_reader *pfile; |
881 | { | |
041c3194 ZW |
882 | cpp_buffer *buffer = pfile->buffer; |
883 | register const unsigned char *cur = buffer->cur; | |
884 | int multiline = 0; | |
885 | ||
886 | for (; cur < buffer->rlimit; ) | |
887 | { | |
888 | unsigned char c = *cur++; | |
889 | ||
91fcd158 | 890 | if (is_vspace (c)) |
45b966db | 891 | { |
041c3194 ZW |
892 | /* Check for a (trigaph?) backslash escaping the newline. */ |
893 | if (!backslash_start (pfile, cur - 2)) | |
894 | goto out; | |
895 | multiline = 1; | |
896 | handle_newline (cur, buffer->rlimit, c); | |
897 | } | |
898 | } | |
899 | cur++; | |
45b966db | 900 | |
041c3194 ZW |
901 | out: |
902 | buffer->cur = cur - 1; /* Leave newline for caller. */ | |
903 | return multiline; | |
904 | } | |
45b966db | 905 | |
041c3194 ZW |
906 | /* Skips whitespace, stopping at next non-whitespace character. |
907 | Adjusts pfile->col_adjust to account for tabs. This enables tokens | |
908 | to be assigned the correct column. */ | |
909 | static void | |
910 | skip_whitespace (pfile, in_directive) | |
911 | cpp_reader *pfile; | |
912 | int in_directive; | |
913 | { | |
914 | cpp_buffer *buffer = pfile->buffer; | |
91fcd158 | 915 | unsigned short warned = 0; |
45b966db | 916 | |
91fcd158 NB |
917 | /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */ |
918 | while (buffer->cur < buffer->rlimit) | |
041c3194 | 919 | { |
91fcd158 | 920 | unsigned char c = *buffer->cur; |
45b966db | 921 | |
91fcd158 NB |
922 | if (!is_nvspace (c)) |
923 | break; | |
924 | ||
925 | buffer->cur++; | |
926 | /* Horizontal space always OK. */ | |
927 | if (c == ' ') | |
928 | continue; | |
929 | else if (c == '\t') | |
930 | pfile->col_adjust += CPP_OPTION (pfile, tabstop) - 1 | |
931 | - (CPP_BUF_COL (buffer) - 1) % CPP_OPTION(pfile, tabstop); | |
932 | /* Must be \f \v or \0. */ | |
933 | else if (c == '\0') | |
041c3194 | 934 | { |
91fcd158 NB |
935 | if (!warned) |
936 | cpp_warning_with_line (pfile, CPP_BUF_LINE (buffer), | |
937 | CPP_BUF_COL (buffer), | |
938 | "embedded null character ignored"); | |
939 | warned = 1; | |
45b966db | 940 | } |
041c3194 | 941 | else if (in_directive && CPP_PEDANTIC (pfile)) |
91fcd158 NB |
942 | cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer), |
943 | CPP_BUF_COL (buffer), | |
944 | "%s in preprocessing directive", | |
945 | c == '\f' ? "form feed" : "vertical tab"); | |
45b966db | 946 | } |
041c3194 | 947 | } |
45b966db | 948 | |
041c3194 | 949 | /* Parse (append) an identifier. */ |
bfb9dc7f ZW |
950 | static inline const U_CHAR * |
951 | parse_name (pfile, tok, cur, rlimit) | |
45b966db | 952 | cpp_reader *pfile; |
bfb9dc7f ZW |
953 | cpp_token *tok; |
954 | const U_CHAR *cur, *rlimit; | |
45b966db | 955 | { |
bfb9dc7f ZW |
956 | const U_CHAR *name = cur; |
957 | unsigned int len; | |
041c3194 | 958 | |
bfb9dc7f | 959 | while (cur < rlimit) |
041c3194 | 960 | { |
bfb9dc7f ZW |
961 | if (! is_idchar (*cur)) |
962 | break; | |
e5ec2402 ZW |
963 | /* $ is not a legal identifier character in the standard, but is |
964 | commonly accepted as an extension. Don't warn about it in | |
965 | skipped conditional blocks. */ | |
bfb9dc7f | 966 | if (*cur == '$' && CPP_PEDANTIC (pfile) && ! pfile->skipping) |
041c3194 | 967 | { |
bfb9dc7f | 968 | CPP_BUFFER (pfile)->cur = cur; |
041c3194 ZW |
969 | cpp_pedwarn (pfile, "'$' character in identifier"); |
970 | } | |
bfb9dc7f | 971 | cur++; |
041c3194 | 972 | } |
bfb9dc7f | 973 | len = cur - name; |
45b966db | 974 | |
bfb9dc7f | 975 | if (tok->val.node) |
041c3194 | 976 | { |
bfb9dc7f ZW |
977 | unsigned int oldlen = tok->val.node->length; |
978 | U_CHAR *newname = alloca (oldlen + len); | |
979 | memcpy (newname, tok->val.node->name, oldlen); | |
980 | memcpy (newname + oldlen, name, len); | |
981 | len += oldlen; | |
982 | name = newname; | |
041c3194 ZW |
983 | } |
984 | ||
bfb9dc7f ZW |
985 | tok->val.node = cpp_lookup (pfile, name, len); |
986 | return cur; | |
45b966db ZW |
987 | } |
988 | ||
041c3194 | 989 | /* Parse (append) a number. */ |
45b966db | 990 | static void |
041c3194 | 991 | parse_number (pfile, list, name) |
45b966db | 992 | cpp_reader *pfile; |
041c3194 | 993 | cpp_toklist *list; |
bfb9dc7f | 994 | cpp_string *name; |
45b966db | 995 | { |
041c3194 ZW |
996 | const unsigned char *name_limit; |
997 | unsigned char *namebuf; | |
998 | cpp_buffer *buffer = pfile->buffer; | |
999 | register const unsigned char *cur = buffer->cur; | |
45b966db | 1000 | |
041c3194 ZW |
1001 | expanded: |
1002 | name_limit = list->namebuf + list->name_cap; | |
1003 | namebuf = list->namebuf + list->name_used; | |
45b966db | 1004 | |
041c3194 ZW |
1005 | for (; cur < buffer->rlimit && namebuf < name_limit; ) |
1006 | { | |
1007 | unsigned char c = *namebuf = *cur; /* Copy a single char. */ | |
45b966db | 1008 | |
041c3194 ZW |
1009 | /* Perhaps we should accept '$' here if we accept it for |
1010 | identifiers. We know namebuf[-1] is safe, because for c to | |
1011 | be a sign we must have pushed at least one character. */ | |
1012 | if (!is_numchar (c) && c != '.' && ! VALID_SIGN (c, namebuf[-1])) | |
1013 | goto out; | |
45b966db | 1014 | |
041c3194 ZW |
1015 | namebuf++; |
1016 | cur++; | |
45b966db | 1017 | } |
64aaf407 | 1018 | |
041c3194 ZW |
1019 | /* Run out of name space? */ |
1020 | if (cur < buffer->rlimit) | |
1021 | { | |
1022 | list->name_used = namebuf - list->namebuf; | |
1023 | auto_expand_name_space (list); | |
1024 | goto expanded; | |
1025 | } | |
1026 | ||
64aaf407 | 1027 | out: |
041c3194 ZW |
1028 | buffer->cur = cur; |
1029 | name->len = namebuf - name->text; | |
1030 | list->name_used = namebuf - list->namebuf; | |
45b966db ZW |
1031 | } |
1032 | ||
041c3194 | 1033 | /* Places a string terminated by an unescaped TERMINATOR into a |
bfb9dc7f | 1034 | cpp_string, which should be expandable and thus at the top of the |
041c3194 ZW |
1035 | list's stack. Handles embedded trigraphs, if necessary, and |
1036 | escaped newlines. | |
45b966db | 1037 | |
041c3194 ZW |
1038 | Can be used for character constants (terminator = '\''), string |
1039 | constants ('"') and angled headers ('>'). Multi-line strings are | |
1040 | allowed, except for within directives. */ | |
45b966db | 1041 | |
041c3194 ZW |
1042 | static void |
1043 | parse_string (pfile, list, token, terminator) | |
45b966db | 1044 | cpp_reader *pfile; |
041c3194 ZW |
1045 | cpp_toklist *list; |
1046 | cpp_token *token; | |
1047 | unsigned int terminator; | |
45b966db | 1048 | { |
041c3194 | 1049 | cpp_buffer *buffer = pfile->buffer; |
bfb9dc7f | 1050 | cpp_string *name = &token->val.str; |
041c3194 ZW |
1051 | register const unsigned char *cur = buffer->cur; |
1052 | const unsigned char *name_limit; | |
1053 | unsigned char *namebuf; | |
1054 | unsigned int null_count = 0; | |
1055 | unsigned int trigraphed = list->name_used; | |
45b966db | 1056 | |
041c3194 ZW |
1057 | expanded: |
1058 | name_limit = list->namebuf + list->name_cap; | |
1059 | namebuf = list->namebuf + list->name_used; | |
f2d5f0cc | 1060 | |
041c3194 | 1061 | for (; cur < buffer->rlimit && namebuf < name_limit; ) |
45b966db | 1062 | { |
041c3194 | 1063 | unsigned int c = *namebuf++ = *cur++; /* Copy a single char. */ |
45b966db | 1064 | |
041c3194 ZW |
1065 | if (c == '\0') |
1066 | null_count++; | |
91fcd158 | 1067 | else if (c == terminator || is_vspace (c)) |
45b966db | 1068 | { |
041c3194 ZW |
1069 | /* Needed for trigraph_replace and multiline string warning. */ |
1070 | buffer->cur = cur; | |
5eec0563 | 1071 | |
041c3194 ZW |
1072 | /* Scan for trigraphs before checking if backslash-escaped. */ |
1073 | if ((CPP_OPTION (pfile, trigraphs) | |
1074 | || CPP_OPTION (pfile, warn_trigraphs)) | |
1075 | && namebuf - (list->namebuf + trigraphed) >= 3) | |
45b966db | 1076 | { |
041c3194 ZW |
1077 | namebuf = trigraph_replace (pfile, list->namebuf + trigraphed, |
1078 | namebuf); | |
1079 | /* The test above guarantees trigraphed will be positive. */ | |
1080 | trigraphed = namebuf - list->namebuf - 2; | |
45b966db | 1081 | } |
45b966db | 1082 | |
041c3194 | 1083 | namebuf--; /* Drop the newline / terminator from the name. */ |
91fcd158 | 1084 | if (is_vspace (c)) |
45b966db | 1085 | { |
041c3194 ZW |
1086 | /* Drop a backslash newline, and continue. */ |
1087 | if (namebuf[-1] == '\\') | |
45b966db | 1088 | { |
041c3194 ZW |
1089 | handle_newline (cur, buffer->rlimit, c); |
1090 | namebuf--; | |
1091 | continue; | |
45b966db | 1092 | } |
45b966db | 1093 | |
041c3194 | 1094 | cur--; |
45b966db | 1095 | |
041c3194 ZW |
1096 | /* In Fortran and assembly language, silently terminate |
1097 | strings of either variety at end of line. This is a | |
1098 | kludge around not knowing where comments are in these | |
1099 | languages. */ | |
1100 | if (CPP_OPTION (pfile, lang_fortran) | |
1101 | || CPP_OPTION (pfile, lang_asm)) | |
1102 | goto out; | |
64aaf407 | 1103 | |
041c3194 ZW |
1104 | /* Character constants, headers and asserts may not |
1105 | extend over multiple lines. In Standard C, neither | |
1106 | may strings. We accept multiline strings as an | |
1107 | extension. (Even in directives - otherwise, glibc's | |
1108 | longlong.h breaks.) */ | |
1109 | if (terminator != '"') | |
1110 | goto unterminated; | |
1111 | ||
1112 | cur++; /* Move forwards again. */ | |
45b966db | 1113 | |
041c3194 ZW |
1114 | if (pfile->multiline_string_line == 0) |
1115 | { | |
1116 | pfile->multiline_string_line = token->line; | |
1117 | pfile->multiline_string_column = token->col; | |
1118 | if (CPP_PEDANTIC (pfile)) | |
1119 | cpp_pedwarn (pfile, "multi-line string constant"); | |
1120 | } | |
1121 | ||
1122 | *namebuf++ = '\n'; | |
1123 | handle_newline (cur, buffer->rlimit, c); | |
45b966db ZW |
1124 | } |
1125 | else | |
1126 | { | |
041c3194 | 1127 | unsigned char *temp; |
45b966db | 1128 | |
041c3194 ZW |
1129 | /* An odd number of consecutive backslashes represents |
1130 | an escaped terminator. */ | |
1131 | temp = namebuf - 1; | |
1132 | while (temp >= name->text && *temp == '\\') | |
1133 | temp--; | |
45b966db | 1134 | |
041c3194 ZW |
1135 | if ((namebuf - temp) & 1) |
1136 | goto out; | |
1137 | namebuf++; | |
1138 | } | |
45b966db | 1139 | } |
ff2b53ef | 1140 | } |
45b966db | 1141 | |
041c3194 ZW |
1142 | /* Run out of name space? */ |
1143 | if (cur < buffer->rlimit) | |
45b966db | 1144 | { |
041c3194 ZW |
1145 | list->name_used = namebuf - list->namebuf; |
1146 | auto_expand_name_space (list); | |
1147 | goto expanded; | |
1148 | } | |
45b966db | 1149 | |
041c3194 ZW |
1150 | /* We may not have trigraph-replaced the input for this code path, |
1151 | but as the input is in error by being unterminated we don't | |
1152 | bother. Prevent warnings about no newlines at EOF. */ | |
91fcd158 | 1153 | if (is_vspace (cur[-1])) |
041c3194 | 1154 | cur--; |
45b966db | 1155 | |
041c3194 ZW |
1156 | unterminated: |
1157 | cpp_error (pfile, "missing terminating %c character", (int) terminator); | |
476f2869 | 1158 | |
041c3194 ZW |
1159 | if (terminator == '\"' && pfile->multiline_string_line != list->line |
1160 | && pfile->multiline_string_line != 0) | |
1161 | { | |
1162 | cpp_error_with_line (pfile, pfile->multiline_string_line, | |
1163 | pfile->multiline_string_column, | |
1164 | "possible start of unterminated string literal"); | |
1165 | pfile->multiline_string_line = 0; | |
45b966db | 1166 | } |
041c3194 ZW |
1167 | |
1168 | out: | |
1169 | buffer->cur = cur; | |
1170 | name->len = namebuf - name->text; | |
1171 | list->name_used = namebuf - list->namebuf; | |
45b966db | 1172 | |
041c3194 ZW |
1173 | if (null_count > 0) |
1174 | cpp_warning (pfile, (null_count > 1 ? "null characters preserved" | |
1175 | : "null character preserved")); | |
45b966db ZW |
1176 | } |
1177 | ||
041c3194 ZW |
1178 | /* The character TYPE helps us distinguish comment types: '*' = C |
1179 | style, '-' = Chill-style and '/' = C++ style. For code simplicity, | |
1180 | the stored comment includes the comment start and any terminator. */ | |
1181 | ||
1182 | #define COMMENT_START_LEN 2 | |
9e62c811 | 1183 | static void |
041c3194 ZW |
1184 | save_comment (list, token, from, len, type) |
1185 | cpp_toklist *list; | |
1186 | cpp_token *token; | |
1187 | const unsigned char *from; | |
9e62c811 | 1188 | unsigned int len; |
041c3194 | 1189 | unsigned int type; |
9e62c811 | 1190 | { |
041c3194 ZW |
1191 | unsigned char *buffer; |
1192 | ||
1193 | len += COMMENT_START_LEN; | |
9e62c811 | 1194 | |
041c3194 ZW |
1195 | if (list->name_used + len > list->name_cap) |
1196 | _cpp_expand_name_space (list, len); | |
9e62c811 | 1197 | |
bfb9dc7f | 1198 | INIT_TOKEN_STR (list, token); |
041c3194 | 1199 | token->type = CPP_COMMENT; |
bfb9dc7f | 1200 | token->val.str.len = len; |
45b966db | 1201 | |
041c3194 ZW |
1202 | buffer = list->namebuf + list->name_used; |
1203 | list->name_used += len; | |
45b966db | 1204 | |
041c3194 ZW |
1205 | /* Copy the comment. */ |
1206 | if (type == '*') | |
45b966db | 1207 | { |
041c3194 ZW |
1208 | *buffer++ = '/'; |
1209 | *buffer++ = '*'; | |
45b966db | 1210 | } |
041c3194 | 1211 | else |
ea4a453b | 1212 | { |
041c3194 ZW |
1213 | *buffer++ = type; |
1214 | *buffer++ = type; | |
ea4a453b | 1215 | } |
041c3194 | 1216 | memcpy (buffer, from, len - COMMENT_START_LEN); |
45b966db ZW |
1217 | } |
1218 | ||
041c3194 ZW |
1219 | /* |
1220 | * The tokenizer's main loop. Returns a token list, representing a | |
1221 | * logical line in the input file. On EOF after some tokens have | |
1222 | * been processed, we return immediately. Then in next call, or if | |
1223 | * EOF occurred at the beginning of a logical line, a single CPP_EOF | |
1224 | * token is placed in the list. | |
1225 | * | |
1226 | * Implementation relies almost entirely on lookback, rather than | |
1227 | * looking forwards. This means that tokenization requires just | |
1228 | * a single pass of the file, even in the presence of trigraphs and | |
1229 | * escaped newlines, providing significant performance benefits. | |
1230 | * Trigraph overhead is negligible if they are disabled, and low | |
1231 | * even when enabled. | |
1232 | */ | |
1233 | ||
91fcd158 | 1234 | #define KNOWN_DIRECTIVE() (list->directive != 0) |
041c3194 ZW |
1235 | #define MIGHT_BE_DIRECTIVE() \ |
1236 | (cur_token == &list->tokens[first_token + 1] && cur_token[-1].type == CPP_HASH) | |
45b966db | 1237 | |
041c3194 ZW |
1238 | static void |
1239 | lex_line (pfile, list) | |
45b966db | 1240 | cpp_reader *pfile; |
041c3194 | 1241 | cpp_toklist *list; |
45b966db | 1242 | { |
041c3194 ZW |
1243 | cpp_token *cur_token, *token_limit, *first; |
1244 | cpp_buffer *buffer = pfile->buffer; | |
1245 | const unsigned char *cur = buffer->cur; | |
1246 | unsigned char flags = 0; | |
1247 | unsigned int first_token = list->tokens_used; | |
45b966db | 1248 | |
041c3194 ZW |
1249 | if (!(list->flags & LIST_OFFSET)) |
1250 | (abort) (); | |
1251 | ||
1252 | list->file = buffer->nominal_fname; | |
1253 | list->line = CPP_BUF_LINE (buffer); | |
1254 | pfile->col_adjust = 0; | |
1255 | pfile->in_lex_line = 1; | |
1256 | if (cur == buffer->buf) | |
1257 | list->flags |= BEG_OF_FILE; | |
1258 | ||
1259 | expanded: | |
1260 | token_limit = list->tokens + list->tokens_cap; | |
1261 | cur_token = list->tokens + list->tokens_used; | |
45b966db | 1262 | |
041c3194 | 1263 | for (; cur < buffer->rlimit && cur_token < token_limit;) |
45b966db | 1264 | { |
041c3194 | 1265 | unsigned char c; |
45b966db | 1266 | |
91fcd158 NB |
1267 | /* Optimize non-vertical whitespace skipping; most tokens are |
1268 | probably separated by whitespace. (' ' '\t' '\v' '\f' '\0'). */ | |
1269 | c = *cur; | |
1270 | if (is_nvspace (c)) | |
45b966db | 1271 | { |
91fcd158 NB |
1272 | buffer->cur = cur; |
1273 | skip_whitespace (pfile, (list->tokens[first_token].type == CPP_HASH | |
1274 | && cur_token > &list->tokens[first_token])); | |
041c3194 | 1275 | cur = buffer->cur; |
ff2b53ef | 1276 | |
041c3194 ZW |
1277 | flags = PREV_WHITE; |
1278 | if (cur == buffer->rlimit) | |
1279 | break; | |
91fcd158 | 1280 | c = *cur; |
45b966db | 1281 | } |
91fcd158 | 1282 | cur++; |
45b966db | 1283 | |
041c3194 ZW |
1284 | /* Initialize current token. CPP_EOF will not be fixed up by |
1285 | expand_name_space. */ | |
1286 | list->tokens_used = cur_token - list->tokens + 1; | |
1287 | cur_token->type = CPP_EOF; | |
1288 | cur_token->col = CPP_BUF_COLUMN (buffer, cur); | |
1289 | cur_token->line = CPP_BUF_LINE (buffer); | |
1290 | cur_token->flags = flags; | |
1291 | flags = 0; | |
46d07497 | 1292 | |
041c3194 ZW |
1293 | switch (c) |
1294 | { | |
1295 | case '0': case '1': case '2': case '3': case '4': | |
1296 | case '5': case '6': case '7': case '8': case '9': | |
1297 | { | |
1298 | int prev_dot; | |
46d07497 | 1299 | |
041c3194 ZW |
1300 | cur--; /* Backup character. */ |
1301 | prev_dot = PREV_TOKEN_TYPE == CPP_DOT && IMMED_TOKEN (); | |
1302 | if (prev_dot) | |
1303 | cur_token--; | |
bfb9dc7f | 1304 | INIT_TOKEN_STR (list, cur_token); |
041c3194 ZW |
1305 | /* Prepend an immediately previous CPP_DOT token. */ |
1306 | if (prev_dot) | |
1307 | { | |
1308 | if (list->name_cap == list->name_used) | |
1309 | auto_expand_name_space (list); | |
46d07497 | 1310 | |
bfb9dc7f | 1311 | cur_token->val.str.len = 1; |
041c3194 ZW |
1312 | list->namebuf[list->name_used++] = '.'; |
1313 | } | |
46d07497 | 1314 | |
041c3194 ZW |
1315 | continue_number: |
1316 | cur_token->type = CPP_NUMBER; /* Before parse_number. */ | |
1317 | buffer->cur = cur; | |
bfb9dc7f | 1318 | parse_number (pfile, list, &cur_token->val.str); |
041c3194 ZW |
1319 | cur = buffer->cur; |
1320 | } | |
1321 | /* Check for # 123 form of #line. */ | |
1322 | if (MIGHT_BE_DIRECTIVE ()) | |
1323 | list->directive = _cpp_check_linemarker (pfile, cur_token, | |
1324 | !(cur_token[-1].flags | |
1325 | & PREV_WHITE)); | |
1326 | cur_token++; | |
1327 | break; | |
46d07497 | 1328 | |
041c3194 ZW |
1329 | letter: |
1330 | case '_': | |
1331 | case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': | |
1332 | case 'g': case 'h': case 'i': case 'j': case 'k': case 'l': | |
1333 | case 'm': case 'n': case 'o': case 'p': case 'q': case 'r': | |
1334 | case 's': case 't': case 'u': case 'v': case 'w': case 'x': | |
1335 | case 'y': case 'z': | |
1336 | case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': | |
1337 | case 'G': case 'H': case 'I': case 'J': case 'K': case 'L': | |
1338 | case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': | |
1339 | case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': | |
1340 | case 'Y': case 'Z': | |
1341 | cur--; /* Backup character. */ | |
bfb9dc7f | 1342 | cur_token->val.node = 0; |
041c3194 ZW |
1343 | cur_token->type = CPP_NAME; /* Identifier, macro etc. */ |
1344 | ||
1345 | continue_name: | |
bfb9dc7f | 1346 | cur = parse_name (pfile, cur_token, cur, buffer->rlimit); |
45b966db | 1347 | |
041c3194 ZW |
1348 | if (MIGHT_BE_DIRECTIVE ()) |
1349 | list->directive = _cpp_check_directive (pfile, cur_token, | |
1350 | !(list->tokens[0].flags | |
1351 | & PREV_WHITE)); | |
1352 | cur_token++; | |
1353 | break; | |
f8f769ea | 1354 | |
041c3194 ZW |
1355 | case '\'': |
1356 | /* Character constants are not recognized when processing Fortran, | |
1357 | or if -traditional. */ | |
1358 | if (CPP_OPTION (pfile, lang_fortran) || CPP_TRADITIONAL (pfile)) | |
1359 | goto other; | |
45b966db | 1360 | |
041c3194 ZW |
1361 | /* Fall through. */ |
1362 | case '\"': | |
1363 | /* Traditionally, escaped strings are not strings. */ | |
1364 | if (CPP_TRADITIONAL (pfile) && IMMED_TOKEN () | |
1365 | && PREV_TOKEN_TYPE == CPP_BACKSLASH) | |
1366 | goto other; | |
04e3ec78 | 1367 | |
041c3194 ZW |
1368 | cur_token->type = c == '\'' ? CPP_CHAR : CPP_STRING; |
1369 | /* Do we have a wide string? */ | |
1370 | if (cur_token[-1].type == CPP_NAME && IMMED_TOKEN () | |
bfb9dc7f | 1371 | && cur_token[-1].val.node == pfile->spec_nodes->n_L |
041c3194 | 1372 | && !CPP_TRADITIONAL (pfile)) |
04e3ec78 | 1373 | { |
041c3194 | 1374 | (--cur_token)->type = (c == '\'' ? CPP_WCHAR : CPP_WSTRING); |
04e3ec78 | 1375 | } |
45b966db | 1376 | |
041c3194 ZW |
1377 | do_parse_string: |
1378 | /* Here c is one of ' " or >. */ | |
bfb9dc7f | 1379 | INIT_TOKEN_STR (list, cur_token); |
041c3194 ZW |
1380 | buffer->cur = cur; |
1381 | parse_string (pfile, list, cur_token, c); | |
1382 | cur = buffer->cur; | |
1383 | cur_token++; | |
1384 | break; | |
45b966db | 1385 | |
041c3194 ZW |
1386 | case '/': |
1387 | cur_token->type = CPP_DIV; | |
1388 | if (IMMED_TOKEN ()) | |
1389 | { | |
1390 | if (PREV_TOKEN_TYPE == CPP_DIV) | |
1391 | { | |
1392 | /* We silently allow C++ comments in system headers, | |
1393 | irrespective of conformance mode, because lots of | |
1394 | broken systems do that and trying to clean it up | |
1395 | in fixincludes is a nightmare. */ | |
1396 | if (CPP_IN_SYSTEM_HEADER (pfile)) | |
1397 | goto do_line_comment; | |
1398 | else if (CPP_OPTION (pfile, cplusplus_comments)) | |
1399 | { | |
1400 | if (CPP_OPTION (pfile, c89) && CPP_PEDANTIC (pfile) | |
1401 | && ! buffer->warned_cplusplus_comments) | |
1402 | { | |
1403 | buffer->cur = cur; | |
1404 | cpp_pedwarn (pfile, | |
1405 | "C++ style comments are not allowed in ISO C89"); | |
1406 | cpp_pedwarn (pfile, | |
1407 | "(this will be reported only once per input file)"); | |
1408 | buffer->warned_cplusplus_comments = 1; | |
1409 | } | |
1410 | do_line_comment: | |
1411 | buffer->cur = cur; | |
1412 | #if 0 /* Leave until new lexer in place. */ | |
1413 | if (cur[-2] != c) | |
1414 | cpp_warning (pfile, | |
1415 | "comment start split across lines"); | |
1416 | #endif | |
1417 | if (skip_line_comment (pfile)) | |
1418 | cpp_warning (pfile, "multi-line comment"); | |
f8f769ea | 1419 | |
041c3194 ZW |
1420 | /* Back-up to first '-' or '/'. */ |
1421 | cur_token--; | |
1422 | if (!CPP_OPTION (pfile, discard_comments) | |
91fcd158 | 1423 | && (!KNOWN_DIRECTIVE() |
041c3194 ZW |
1424 | || (list->directive->flags & COMMENTS))) |
1425 | save_comment (list, cur_token++, cur, | |
1426 | buffer->cur - cur, c); | |
1427 | else if (!CPP_OPTION (pfile, traditional)) | |
1428 | flags = PREV_WHITE; | |
1429 | ||
1430 | cur = buffer->cur; | |
1431 | break; | |
1432 | } | |
1433 | } | |
1434 | } | |
1435 | cur_token++; | |
1436 | break; | |
1437 | ||
1438 | case '*': | |
1439 | cur_token->type = CPP_MULT; | |
1440 | if (IMMED_TOKEN ()) | |
45b966db | 1441 | { |
041c3194 ZW |
1442 | if (PREV_TOKEN_TYPE == CPP_DIV) |
1443 | { | |
1444 | buffer->cur = cur; | |
1445 | #if 0 /* Leave until new lexer in place. */ | |
1446 | if (cur[-2] != '/') | |
1447 | cpp_warning (pfile, | |
1448 | "comment start '/*' split across lines"); | |
1449 | #endif | |
1450 | if (skip_block_comment (pfile)) | |
1451 | cpp_error_with_line (pfile, list->line, cur_token[-1].col, | |
1452 | "unterminated comment"); | |
1453 | #if 0 /* Leave until new lexer in place. */ | |
1454 | else if (buffer->cur[-2] != '*') | |
1455 | cpp_warning (pfile, | |
1456 | "comment end '*/' split across lines"); | |
1457 | #endif | |
1458 | /* Back up to opening '/'. */ | |
1459 | cur_token--; | |
1460 | if (!CPP_OPTION (pfile, discard_comments) | |
91fcd158 | 1461 | && (!KNOWN_DIRECTIVE() |
041c3194 ZW |
1462 | || (list->directive->flags & COMMENTS))) |
1463 | save_comment (list, cur_token++, cur, | |
1464 | buffer->cur - cur, c); | |
1465 | else if (!CPP_OPTION (pfile, traditional)) | |
1466 | flags = PREV_WHITE; | |
1467 | ||
1468 | cur = buffer->cur; | |
1469 | break; | |
1470 | } | |
1471 | else if (CPP_OPTION (pfile, cplusplus)) | |
1472 | { | |
1473 | /* In C++, there are .* and ->* operators. */ | |
1474 | if (PREV_TOKEN_TYPE == CPP_DEREF) | |
1475 | BACKUP_TOKEN (CPP_DEREF_STAR); | |
1476 | else if (PREV_TOKEN_TYPE == CPP_DOT) | |
1477 | BACKUP_TOKEN (CPP_DOT_STAR); | |
1478 | } | |
45b966db | 1479 | } |
041c3194 | 1480 | cur_token++; |
f8f769ea | 1481 | break; |
45b966db | 1482 | |
041c3194 ZW |
1483 | case '\n': |
1484 | case '\r': | |
1485 | handle_newline (cur, buffer->rlimit, c); | |
1486 | if (PREV_TOKEN_TYPE == CPP_BACKSLASH) | |
45b966db | 1487 | { |
041c3194 | 1488 | if (IMMED_TOKEN ()) |
45b966db | 1489 | { |
041c3194 ZW |
1490 | /* Remove the escaped newline. Then continue to process |
1491 | any interrupted name or number. */ | |
1492 | cur_token--; | |
1493 | /* Backslash-newline may not be immediately followed by | |
1494 | EOF (C99 5.1.1.2). */ | |
1495 | if (cur >= buffer->rlimit) | |
1496 | { | |
1497 | cpp_pedwarn (pfile, "backslash-newline at end of file"); | |
1498 | break; | |
1499 | } | |
1500 | if (IMMED_TOKEN ()) | |
1501 | { | |
1502 | cur_token--; | |
1503 | if (cur_token->type == CPP_NAME) | |
1504 | goto continue_name; | |
1505 | else if (cur_token->type == CPP_NUMBER) | |
1506 | goto continue_number; | |
1507 | cur_token++; | |
1508 | } | |
1509 | /* Remember whitespace setting. */ | |
1510 | flags = cur_token->flags; | |
f8f769ea | 1511 | break; |
45b966db | 1512 | } |
041c3194 ZW |
1513 | else |
1514 | { | |
1515 | buffer->cur = cur; | |
1516 | cpp_warning (pfile, | |
1517 | "backslash and newline separated by space"); | |
1518 | } | |
1519 | } | |
1520 | else if (MIGHT_BE_DIRECTIVE ()) | |
1521 | { | |
1522 | /* "Null directive." C99 6.10.7: A preprocessing | |
1523 | directive of the form # <new-line> has no effect. | |
1524 | ||
1525 | But it is still a directive, and therefore disappears | |
1526 | from the output. */ | |
1527 | cur_token--; | |
1528 | if (cur_token->flags & PREV_WHITE) | |
45b966db | 1529 | { |
041c3194 ZW |
1530 | if (CPP_WTRADITIONAL (pfile)) |
1531 | cpp_warning (pfile, | |
1532 | "K+R C ignores #\\n with the # indented"); | |
1533 | if (CPP_TRADITIONAL (pfile)) | |
1534 | cur_token++; | |
45b966db | 1535 | } |
f8f769ea | 1536 | } |
45b966db | 1537 | |
041c3194 ZW |
1538 | /* Skip vertical space until we have at least one token to |
1539 | return. */ | |
1540 | if (cur_token != &list->tokens[first_token]) | |
1541 | goto out; | |
1542 | list->line = CPP_BUF_LINE (buffer); | |
f8f769ea | 1543 | break; |
04e3ec78 | 1544 | |
041c3194 ZW |
1545 | case '-': |
1546 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_MINUS) | |
1547 | { | |
1548 | if (CPP_OPTION (pfile, chill)) | |
1549 | goto do_line_comment; | |
1550 | REVISE_TOKEN (CPP_MINUS_MINUS); | |
1551 | } | |
1552 | else | |
1553 | PUSH_TOKEN (CPP_MINUS); | |
1554 | break; | |
45b966db | 1555 | |
041c3194 ZW |
1556 | make_hash: |
1557 | case '#': | |
1558 | /* The digraph flag checking ensures that ## and %:%: | |
1559 | are interpreted as CPP_PASTE, but #%: and %:# are not. */ | |
1560 | if (PREV_TOKEN_TYPE == CPP_HASH && IMMED_TOKEN () | |
1561 | && ((cur_token->flags ^ cur_token[-1].flags) & DIGRAPH) == 0) | |
1562 | REVISE_TOKEN (CPP_PASTE); | |
1563 | else | |
1564 | PUSH_TOKEN (CPP_HASH); | |
1565 | break; | |
04e3ec78 | 1566 | |
041c3194 ZW |
1567 | case ':': |
1568 | cur_token->type = CPP_COLON; | |
1569 | if (IMMED_TOKEN ()) | |
1570 | { | |
1571 | if (PREV_TOKEN_TYPE == CPP_COLON | |
1572 | && CPP_OPTION (pfile, cplusplus)) | |
1573 | BACKUP_TOKEN (CPP_SCOPE); | |
9b55f29a | 1574 | else if (CPP_OPTION (pfile, digraphs)) |
041c3194 | 1575 | { |
9b55f29a NB |
1576 | /* Digraph: "<:" is a '[' */ |
1577 | if (PREV_TOKEN_TYPE == CPP_LESS) | |
1578 | BACKUP_DIGRAPH (CPP_OPEN_SQUARE); | |
1579 | /* Digraph: "%:" is a '#' */ | |
1580 | else if (PREV_TOKEN_TYPE == CPP_MOD) | |
1581 | { | |
1582 | (--cur_token)->flags |= DIGRAPH; | |
1583 | goto make_hash; | |
1584 | } | |
041c3194 ZW |
1585 | } |
1586 | } | |
1587 | cur_token++; | |
1588 | break; | |
f8f769ea | 1589 | |
041c3194 ZW |
1590 | case '&': |
1591 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_AND) | |
1592 | REVISE_TOKEN (CPP_AND_AND); | |
1593 | else | |
1594 | PUSH_TOKEN (CPP_AND); | |
f8f769ea | 1595 | break; |
45b966db | 1596 | |
041c3194 ZW |
1597 | make_or: |
1598 | case '|': | |
1599 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_OR) | |
1600 | REVISE_TOKEN (CPP_OR_OR); | |
1601 | else | |
1602 | PUSH_TOKEN (CPP_OR); | |
1603 | break; | |
45b966db | 1604 | |
041c3194 ZW |
1605 | case '+': |
1606 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_PLUS) | |
1607 | REVISE_TOKEN (CPP_PLUS_PLUS); | |
1608 | else | |
1609 | PUSH_TOKEN (CPP_PLUS); | |
1610 | break; | |
45b966db | 1611 | |
041c3194 ZW |
1612 | case '=': |
1613 | /* This relies on equidistance of "?=" and "?" tokens. */ | |
1614 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE <= CPP_LAST_EQ) | |
1615 | REVISE_TOKEN (PREV_TOKEN_TYPE + (CPP_EQ_EQ - CPP_EQ)); | |
1616 | else | |
1617 | PUSH_TOKEN (CPP_EQ); | |
1618 | break; | |
45b966db | 1619 | |
041c3194 ZW |
1620 | case '>': |
1621 | cur_token->type = CPP_GREATER; | |
1622 | if (IMMED_TOKEN ()) | |
1623 | { | |
1624 | if (PREV_TOKEN_TYPE == CPP_GREATER) | |
1625 | BACKUP_TOKEN (CPP_RSHIFT); | |
1626 | else if (PREV_TOKEN_TYPE == CPP_MINUS) | |
1627 | BACKUP_TOKEN (CPP_DEREF); | |
9b55f29a NB |
1628 | else if (CPP_OPTION (pfile, digraphs)) |
1629 | { | |
1630 | /* Digraph: ":>" is a ']' */ | |
1631 | if (PREV_TOKEN_TYPE == CPP_COLON) | |
1632 | BACKUP_DIGRAPH (CPP_CLOSE_SQUARE); | |
1633 | /* Digraph: "%>" is a '}' */ | |
1634 | else if (PREV_TOKEN_TYPE == CPP_MOD) | |
1635 | BACKUP_DIGRAPH (CPP_CLOSE_BRACE); | |
1636 | } | |
041c3194 ZW |
1637 | } |
1638 | cur_token++; | |
1639 | break; | |
1640 | ||
1641 | case '<': | |
1642 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_LESS) | |
1643 | { | |
1644 | REVISE_TOKEN (CPP_LSHIFT); | |
1645 | break; | |
1646 | } | |
1647 | /* Is this the beginning of a header name? */ | |
91fcd158 | 1648 | if (KNOWN_DIRECTIVE () && (list->directive->flags & INCL)) |
041c3194 ZW |
1649 | { |
1650 | c = '>'; /* Terminator. */ | |
1651 | cur_token->type = CPP_HEADER_NAME; | |
1652 | goto do_parse_string; | |
1653 | } | |
1654 | PUSH_TOKEN (CPP_LESS); | |
1655 | break; | |
45b966db | 1656 | |
041c3194 ZW |
1657 | case '%': |
1658 | /* Digraph: "<%" is a '{' */ | |
1659 | cur_token->type = CPP_MOD; | |
9b55f29a NB |
1660 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_LESS |
1661 | && CPP_OPTION (pfile, digraphs)) | |
041c3194 ZW |
1662 | BACKUP_DIGRAPH (CPP_OPEN_BRACE); |
1663 | cur_token++; | |
1664 | break; | |
04e3ec78 | 1665 | |
041c3194 ZW |
1666 | case '?': |
1667 | if (cur + 1 < buffer->rlimit && *cur == '?' | |
1668 | && trigraph_map[cur[1]] && trigraph_ok (pfile, cur + 1)) | |
1669 | { | |
1670 | /* Handle trigraph. */ | |
1671 | cur++; | |
1672 | switch (*cur++) | |
1673 | { | |
1674 | case '(': goto make_open_square; | |
1675 | case ')': goto make_close_square; | |
1676 | case '<': goto make_open_brace; | |
1677 | case '>': goto make_close_brace; | |
1678 | case '=': goto make_hash; | |
1679 | case '!': goto make_or; | |
1680 | case '-': goto make_complement; | |
1681 | case '/': goto make_backslash; | |
1682 | case '\'': goto make_xor; | |
1683 | } | |
1684 | } | |
1685 | if (IMMED_TOKEN () && CPP_OPTION (pfile, cplusplus)) | |
1686 | { | |
1687 | /* GNU C++ defines <? and >? operators. */ | |
1688 | if (PREV_TOKEN_TYPE == CPP_LESS) | |
1689 | { | |
1690 | REVISE_TOKEN (CPP_MIN); | |
1691 | break; | |
1692 | } | |
1693 | else if (PREV_TOKEN_TYPE == CPP_GREATER) | |
1694 | { | |
1695 | REVISE_TOKEN (CPP_MAX); | |
1696 | break; | |
1697 | } | |
1698 | } | |
1699 | PUSH_TOKEN (CPP_QUERY); | |
1700 | break; | |
45b966db | 1701 | |
041c3194 ZW |
1702 | case '.': |
1703 | if (PREV_TOKEN_TYPE == CPP_DOT && cur_token[-2].type == CPP_DOT | |
1704 | && IMMED_TOKEN () | |
1705 | && !(cur_token[-1].flags & PREV_WHITE)) | |
1706 | { | |
1707 | cur_token -= 2; | |
1708 | PUSH_TOKEN (CPP_ELLIPSIS); | |
1709 | } | |
1710 | else | |
1711 | PUSH_TOKEN (CPP_DOT); | |
1712 | break; | |
c5a04734 | 1713 | |
041c3194 ZW |
1714 | make_complement: |
1715 | case '~': PUSH_TOKEN (CPP_COMPL); break; | |
1716 | make_xor: | |
1717 | case '^': PUSH_TOKEN (CPP_XOR); break; | |
1718 | make_open_brace: | |
1719 | case '{': PUSH_TOKEN (CPP_OPEN_BRACE); break; | |
1720 | make_close_brace: | |
1721 | case '}': PUSH_TOKEN (CPP_CLOSE_BRACE); break; | |
1722 | make_open_square: | |
1723 | case '[': PUSH_TOKEN (CPP_OPEN_SQUARE); break; | |
1724 | make_close_square: | |
1725 | case ']': PUSH_TOKEN (CPP_CLOSE_SQUARE); break; | |
1726 | make_backslash: | |
1727 | case '\\': PUSH_TOKEN (CPP_BACKSLASH); break; | |
1728 | case '!': PUSH_TOKEN (CPP_NOT); break; | |
1729 | case ',': PUSH_TOKEN (CPP_COMMA); break; | |
1730 | case ';': PUSH_TOKEN (CPP_SEMICOLON); break; | |
1731 | case '(': PUSH_TOKEN (CPP_OPEN_PAREN); break; | |
1732 | case ')': PUSH_TOKEN (CPP_CLOSE_PAREN); break; | |
6d2c2047 | 1733 | |
041c3194 ZW |
1734 | case '$': |
1735 | if (CPP_OPTION (pfile, dollars_in_ident)) | |
1736 | goto letter; | |
1737 | /* Fall through */ | |
1738 | other: | |
1739 | default: | |
1740 | cur_token->val.aux = c; | |
1741 | PUSH_TOKEN (CPP_OTHER); | |
1742 | break; | |
1743 | } | |
1744 | } | |
6d2c2047 | 1745 | |
041c3194 ZW |
1746 | /* Run out of token space? */ |
1747 | if (cur_token == token_limit) | |
1748 | { | |
1749 | list->tokens_used = cur_token - list->tokens; | |
1750 | _cpp_expand_token_space (list, 256); | |
1751 | goto expanded; | |
1752 | } | |
6d2c2047 | 1753 | |
041c3194 ZW |
1754 | cur_token->flags = flags; |
1755 | if (cur_token == &list->tokens[first_token] && pfile->done_initializing) | |
1756 | { | |
91fcd158 | 1757 | if (cur > buffer->buf && !is_vspace (cur[-1])) |
041c3194 ZW |
1758 | cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer), |
1759 | CPP_BUF_COLUMN (buffer, cur), | |
1760 | "no newline at end of file"); | |
1761 | cur_token++->type = CPP_EOF; | |
1762 | } | |
6d2c2047 | 1763 | |
041c3194 ZW |
1764 | out: |
1765 | /* All tokens are allocated, so the memory location is fixed. */ | |
1766 | first = &list->tokens[first_token]; | |
1767 | ||
1768 | /* Don't complain about the null directive, nor directives in | |
1769 | assembly source: we don't know where the comments are, and # may | |
1770 | introduce assembler pseudo-ops. Don't complain about invalid | |
1771 | directives in skipped conditional groups (6.10 p4). */ | |
1772 | if (first->type == CPP_HASH && list->directive == 0 && !pfile->skipping | |
1773 | && cur_token > first + 1 && !CPP_OPTION (pfile, lang_asm)) | |
1774 | { | |
1775 | if (first[1].type == CPP_NAME) | |
1776 | cpp_error (pfile, "invalid preprocessing directive #%.*s", | |
bfb9dc7f | 1777 | (int) first[1].val.node->length, first[1].val.node->name); |
041c3194 ZW |
1778 | else |
1779 | cpp_error (pfile, "invalid preprocessing directive"); | |
1780 | } | |
1781 | ||
91fcd158 NB |
1782 | /* Put EOF at end of known directives. This covers "directives do |
1783 | not extend beyond the end of the line (description 6.10 part 2)". */ | |
1784 | if (KNOWN_DIRECTIVE () || !pfile->done_initializing) | |
041c3194 ZW |
1785 | { |
1786 | pfile->first_directive_token = first; | |
1787 | cur_token++->type = CPP_EOF; | |
1788 | } | |
1789 | ||
91fcd158 NB |
1790 | /* Directives, known or not, always start a new line. */ |
1791 | if (first_token == 0 || list->tokens[first_token].type == CPP_HASH) | |
041c3194 | 1792 | first->flags |= BOL; |
6d2c2047 | 1793 | else |
041c3194 ZW |
1794 | /* 6.10.3.10: Within the sequence of preprocessing tokens making |
1795 | up the invocation of a function-like macro, new line is | |
1796 | considered a normal white-space character. */ | |
1797 | first->flags |= PREV_WHITE; | |
1798 | ||
1799 | buffer->cur = cur; | |
1800 | list->tokens_used = cur_token - list->tokens; | |
1801 | pfile->in_lex_line = 0; | |
6d2c2047 ZW |
1802 | } |
1803 | ||
041c3194 ZW |
1804 | /* Write the spelling of a token TOKEN, with any appropriate |
1805 | whitespace before it, to the token_buffer. PREV is the previous | |
1806 | token, which is used to determine if we need to shove in an extra | |
1807 | space in order to avoid accidental token paste. */ | |
1808 | static void | |
1809 | output_token (pfile, token, prev) | |
1810 | cpp_reader *pfile; | |
1811 | const cpp_token *token, *prev; | |
1812 | { | |
1813 | int dummy; | |
c5a04734 | 1814 | |
041c3194 ZW |
1815 | if (token->col && (token->flags & BOL)) |
1816 | { | |
1817 | /* Supply enough whitespace to put this token in its original | |
1818 | column. Don't bother trying to reconstruct tabs; we can't | |
1819 | get it right in general, and nothing ought to care. (Yes, | |
1820 | some things do care; the fault lies with them.) */ | |
1821 | unsigned char *buffer; | |
1822 | unsigned int spaces = token->col - 1; | |
1823 | ||
1824 | CPP_RESERVE (pfile, token->col); | |
1825 | buffer = pfile->limit; | |
1826 | ||
1827 | while (spaces--) | |
1828 | *buffer++ = ' '; | |
1829 | pfile->limit = buffer; | |
1830 | } | |
1831 | else if (token->flags & PREV_WHITE) | |
1832 | CPP_PUTC (pfile, ' '); | |
1833 | /* Check for and prevent accidental token pasting, in ANSI mode. */ | |
d6d5f795 | 1834 | |
041c3194 ZW |
1835 | else if (!CPP_TRADITIONAL (pfile) && prev) |
1836 | { | |
1837 | if (can_paste (pfile, prev, token, &dummy) != CPP_EOF) | |
1838 | CPP_PUTC (pfile, ' '); | |
1839 | /* can_paste catches most of the accidental paste cases, but not all. | |
1840 | Consider a + ++b - if there is not a space between the + and ++, it | |
1841 | will be misparsed as a++ + b. */ | |
1842 | else if ((prev->type == CPP_PLUS && token->type == CPP_PLUS_PLUS) | |
1843 | || (prev->type == CPP_MINUS && token->type == CPP_MINUS_MINUS)) | |
1844 | CPP_PUTC (pfile, ' '); | |
1845 | } | |
d6d5f795 | 1846 | |
041c3194 ZW |
1847 | CPP_RESERVE (pfile, TOKEN_LEN (token)); |
1848 | pfile->limit = spell_token (pfile, token, pfile->limit); | |
1849 | } | |
d6d5f795 | 1850 | |
041c3194 | 1851 | /* Write the spelling of a token TOKEN to BUFFER. The buffer must |
cf00a885 ZW |
1852 | already contain the enough space to hold the token's spelling. |
1853 | Returns a pointer to the character after the last character | |
1854 | written. */ | |
d6d5f795 | 1855 | |
041c3194 ZW |
1856 | static unsigned char * |
1857 | spell_token (pfile, token, buffer) | |
1858 | cpp_reader *pfile; /* Would be nice to be rid of this... */ | |
1859 | const cpp_token *token; | |
1860 | unsigned char *buffer; | |
1861 | { | |
1862 | switch (token_spellings[token->type].type) | |
1863 | { | |
1864 | case SPELL_OPERATOR: | |
1865 | { | |
1866 | const unsigned char *spelling; | |
1867 | unsigned char c; | |
d6d5f795 | 1868 | |
041c3194 ZW |
1869 | if (token->flags & DIGRAPH) |
1870 | spelling = digraph_spellings[token->type - CPP_FIRST_DIGRAPH]; | |
1871 | else | |
1872 | spelling = token_spellings[token->type].spelling; | |
1873 | ||
1874 | while ((c = *spelling++) != '\0') | |
1875 | *buffer++ = c; | |
1876 | } | |
1877 | break; | |
d6d5f795 | 1878 | |
041c3194 | 1879 | case SPELL_IDENT: |
bfb9dc7f ZW |
1880 | memcpy (buffer, token->val.node->name, token->val.node->length); |
1881 | buffer += token->val.node->length; | |
041c3194 | 1882 | break; |
d6d5f795 | 1883 | |
041c3194 ZW |
1884 | case SPELL_STRING: |
1885 | { | |
041c3194 ZW |
1886 | if (token->type == CPP_WSTRING || token->type == CPP_WCHAR) |
1887 | *buffer++ = 'L'; | |
bfb9dc7f | 1888 | |
041c3194 | 1889 | if (token->type == CPP_STRING || token->type == CPP_WSTRING) |
bfb9dc7f ZW |
1890 | *buffer++ = '"'; |
1891 | if (token->type == CPP_CHAR || token->type == CPP_WCHAR) | |
1892 | *buffer++ = '\''; | |
1893 | ||
1894 | memcpy (buffer, token->val.str.text, token->val.str.len); | |
1895 | buffer += token->val.str.len; | |
1896 | ||
1897 | if (token->type == CPP_STRING || token->type == CPP_WSTRING) | |
1898 | *buffer++ = '"'; | |
1899 | if (token->type == CPP_CHAR || token->type == CPP_WCHAR) | |
1900 | *buffer++ = '\''; | |
041c3194 ZW |
1901 | } |
1902 | break; | |
d6d5f795 | 1903 | |
041c3194 ZW |
1904 | case SPELL_CHAR: |
1905 | *buffer++ = token->val.aux; | |
1906 | break; | |
d6d5f795 | 1907 | |
041c3194 ZW |
1908 | case SPELL_NONE: |
1909 | cpp_ice (pfile, "Unspellable token %s", token_names[token->type]); | |
1910 | break; | |
1911 | } | |
d6d5f795 | 1912 | |
041c3194 ZW |
1913 | return buffer; |
1914 | } | |
d6d5f795 | 1915 | |
cf00a885 ZW |
1916 | /* Return the spelling of a token known to be an operator. |
1917 | Does not distinguish digraphs from their counterparts. */ | |
1918 | const unsigned char * | |
1919 | _cpp_spell_operator (type) | |
1920 | enum cpp_ttype type; | |
1921 | { | |
1922 | if (token_spellings[type].type == SPELL_OPERATOR) | |
1923 | return token_spellings[type].spelling; | |
1924 | else | |
1925 | return token_names[type]; | |
1926 | } | |
1927 | ||
1928 | ||
041c3194 | 1929 | /* Macro expansion algorithm. TODO. */ |
d6d5f795 | 1930 | |
7de9cc38 KG |
1931 | static const cpp_token placemarker_token = {0, 0, CPP_PLACEMARKER, 0 UNION_INIT_ZERO}; |
1932 | static const cpp_token eof_token = {0, 0, CPP_EOF, 0 UNION_INIT_ZERO}; | |
c5a04734 | 1933 | |
041c3194 ZW |
1934 | #define IS_ARG_CONTEXT(c) ((c)->flags & CONTEXT_ARG) |
1935 | #define CURRENT_CONTEXT(pfile) ((pfile)->contexts + (pfile)->cur_context) | |
1936 | ||
1937 | /* Flags for cpp_context. */ | |
1938 | #define CONTEXT_PASTEL (1 << 0) /* An argument context on LHS of ##. */ | |
1939 | #define CONTEXT_PASTER (1 << 1) /* An argument context on RHS of ##. */ | |
1940 | #define CONTEXT_RAW (1 << 2) /* If argument tokens already expanded. */ | |
1941 | #define CONTEXT_ARG (1 << 3) /* If an argument context. */ | |
1942 | ||
1943 | #define ASSIGN_FLAGS_AND_POS(d, s) \ | |
1944 | do {(d)->flags = (s)->flags & (PREV_WHITE | BOL | PASTE_LEFT); \ | |
1945 | if ((d)->flags & BOL) {(d)->col = (s)->col; (d)->line = (s)->line;} \ | |
1946 | } while (0) | |
1947 | ||
1948 | /* f is flags, just consisting of PREV_WHITE | BOL. */ | |
1949 | #define MODIFY_FLAGS_AND_POS(d, s, f) \ | |
1950 | do {(d)->flags &= ~(PREV_WHITE | BOL); (d)->flags |= (f); \ | |
1951 | if ((f) & BOL) {(d)->col = (s)->col; (d)->line = (s)->line;} \ | |
1952 | } while (0) | |
1953 | ||
1954 | typedef struct cpp_context cpp_context; | |
1955 | struct cpp_context | |
1956 | { | |
1957 | union | |
1958 | { | |
1959 | const cpp_toklist *list; /* Used for macro contexts only. */ | |
1960 | const cpp_token **arg; /* Used for arg contexts only. */ | |
1961 | } u; | |
1962 | ||
1963 | /* Pushed token to be returned by next call to cpp_get_token. */ | |
1964 | const cpp_token *pushed_token; | |
1965 | ||
1966 | struct macro_args *args; /* 0 for arguments and object-like macros. */ | |
1967 | unsigned short posn; /* Current posn, index into u. */ | |
1968 | unsigned short count; /* No. of tokens in u. */ | |
1969 | unsigned short level; | |
1970 | unsigned char flags; | |
1971 | }; | |
1972 | ||
1973 | typedef struct macro_args macro_args; | |
1974 | struct macro_args | |
1975 | { | |
1976 | unsigned int *ends; | |
1977 | const cpp_token **tokens; | |
1978 | unsigned int capacity; | |
1979 | unsigned int used; | |
1980 | unsigned short level; | |
1981 | }; | |
1982 | ||
1983 | static const cpp_token *get_raw_token PARAMS ((cpp_reader *)); | |
1984 | static const cpp_token *parse_arg PARAMS ((cpp_reader *, int, unsigned int, | |
1985 | macro_args *, unsigned int *)); | |
1986 | static int parse_args PARAMS ((cpp_reader *, cpp_hashnode *, macro_args *)); | |
1987 | static void save_token PARAMS ((macro_args *, const cpp_token *)); | |
1988 | static const cpp_token *push_arg_context PARAMS ((cpp_reader *, | |
1989 | const cpp_token *)); | |
1990 | static int do_pop_context PARAMS ((cpp_reader *)); | |
1991 | static const cpp_token *pop_context PARAMS ((cpp_reader *)); | |
1992 | static const cpp_token *push_macro_context PARAMS ((cpp_reader *, | |
1993 | cpp_hashnode *, | |
1994 | const cpp_token *)); | |
1995 | static void free_macro_args PARAMS ((macro_args *)); | |
1996 | ||
1997 | /* Free the storage allocated for macro arguments. */ | |
1998 | static void | |
1999 | free_macro_args (args) | |
2000 | macro_args *args; | |
c5a04734 | 2001 | { |
041c3194 ZW |
2002 | if (args->tokens) |
2003 | free (args->tokens); | |
2004 | free (args->ends); | |
2005 | free (args); | |
c5a04734 ZW |
2006 | } |
2007 | ||
041c3194 ZW |
2008 | /* Determines if a macro has been already used (and is therefore |
2009 | disabled). */ | |
c5a04734 | 2010 | static int |
041c3194 | 2011 | is_macro_disabled (pfile, expansion, token) |
c5a04734 | 2012 | cpp_reader *pfile; |
041c3194 ZW |
2013 | const cpp_toklist *expansion; |
2014 | const cpp_token *token; | |
c5a04734 | 2015 | { |
041c3194 ZW |
2016 | cpp_context *context = CURRENT_CONTEXT (pfile); |
2017 | ||
cf00a885 ZW |
2018 | /* Don't expand anything if this file has already been preprocessed. */ |
2019 | if (CPP_OPTION (pfile, preprocessed)) | |
2020 | return 1; | |
2021 | ||
041c3194 ZW |
2022 | /* Arguments on either side of ## are inserted in place without |
2023 | macro expansion (6.10.3.3.2). Conceptually, any macro expansion | |
2024 | occurs during a later rescan pass. The effect is that we expand | |
2025 | iff we would as part of the macro's expansion list, so we should | |
2026 | drop to the macro's context. */ | |
2027 | if (IS_ARG_CONTEXT (context)) | |
c5a04734 | 2028 | { |
041c3194 ZW |
2029 | if (token->flags & PASTED) |
2030 | context--; | |
2031 | else if (!(context->flags & CONTEXT_RAW)) | |
2032 | return 1; | |
2033 | else if (context->flags & (CONTEXT_PASTEL | CONTEXT_PASTER)) | |
2034 | context--; | |
c5a04734 | 2035 | } |
c5a04734 | 2036 | |
041c3194 ZW |
2037 | /* Have we already used this macro? */ |
2038 | while (context->level > 0) | |
c5a04734 | 2039 | { |
041c3194 ZW |
2040 | if (!IS_ARG_CONTEXT (context) && context->u.list == expansion) |
2041 | return 1; | |
2042 | /* Raw argument tokens are judged based on the token list they | |
2043 | came from. */ | |
2044 | if (context->flags & CONTEXT_RAW) | |
2045 | context = pfile->contexts + context->level; | |
2046 | else | |
2047 | context--; | |
2048 | } | |
c5a04734 | 2049 | |
041c3194 ZW |
2050 | /* Function-like macros may be disabled if the '(' is not in the |
2051 | current context. We check this without disrupting the context | |
2052 | stack. */ | |
2053 | if (expansion->paramc >= 0) | |
2054 | { | |
2055 | const cpp_token *next; | |
2056 | unsigned int prev_nme; | |
c5a04734 | 2057 | |
041c3194 ZW |
2058 | context = CURRENT_CONTEXT (pfile); |
2059 | /* Drop down any contexts we're at the end of: the '(' may | |
2060 | appear in lower macro expansions, or in the rest of the file. */ | |
2061 | while (context->posn == context->count && context > pfile->contexts) | |
2062 | { | |
2063 | context--; | |
2064 | /* If we matched, we are disabled, as we appear in the | |
2065 | expansion of each macro we meet. */ | |
2066 | if (!IS_ARG_CONTEXT (context) && context->u.list == expansion) | |
2067 | return 1; | |
2068 | } | |
c5a04734 | 2069 | |
041c3194 ZW |
2070 | prev_nme = pfile->no_expand_level; |
2071 | pfile->no_expand_level = context - pfile->contexts; | |
2072 | next = cpp_get_token (pfile); | |
2073 | restore_macro_expansion (pfile, prev_nme); | |
2074 | if (next->type != CPP_OPEN_PAREN) | |
2075 | { | |
2076 | _cpp_push_token (pfile, next); | |
2077 | if (CPP_OPTION (pfile, warn_traditional)) | |
2078 | cpp_warning (pfile, | |
2079 | "function macro %.*s must be used with arguments in traditional C", | |
bfb9dc7f | 2080 | (int) token->val.node->length, token->val.node->name); |
041c3194 ZW |
2081 | return 1; |
2082 | } | |
c5a04734 | 2083 | } |
c5a04734 | 2084 | |
041c3194 | 2085 | return 0; |
c5a04734 ZW |
2086 | } |
2087 | ||
041c3194 ZW |
2088 | /* Add a token to the set of tokens forming the arguments to the macro |
2089 | being parsed in parse_args. */ | |
2090 | static void | |
2091 | save_token (args, token) | |
2092 | macro_args *args; | |
2093 | const cpp_token *token; | |
c5a04734 | 2094 | { |
041c3194 ZW |
2095 | if (args->used == args->capacity) |
2096 | { | |
2097 | args->capacity += args->capacity + 100; | |
2098 | args->tokens = (const cpp_token **) | |
2099 | xrealloc (args->tokens, args->capacity * sizeof (const cpp_token *)); | |
2100 | } | |
2101 | args->tokens[args->used++] = token; | |
c5a04734 ZW |
2102 | } |
2103 | ||
041c3194 ZW |
2104 | /* Take and save raw tokens until we finish one argument. Empty |
2105 | arguments are saved as a single CPP_PLACEMARKER token. */ | |
2106 | static const cpp_token * | |
2107 | parse_arg (pfile, var_args, paren_context, args, pcount) | |
c5a04734 | 2108 | cpp_reader *pfile; |
041c3194 ZW |
2109 | int var_args; |
2110 | unsigned int paren_context; | |
2111 | macro_args *args; | |
2112 | unsigned int *pcount; | |
c5a04734 | 2113 | { |
041c3194 ZW |
2114 | const cpp_token *token; |
2115 | unsigned int paren = 0, count = 0; | |
2116 | int raw, was_raw = 1; | |
c5a04734 | 2117 | |
041c3194 | 2118 | for (count = 0;; count++) |
c5a04734 | 2119 | { |
041c3194 | 2120 | token = cpp_get_token (pfile); |
c5a04734 | 2121 | |
041c3194 | 2122 | switch (token->type) |
c5a04734 | 2123 | { |
041c3194 ZW |
2124 | default: |
2125 | break; | |
c5a04734 | 2126 | |
041c3194 ZW |
2127 | case CPP_OPEN_PAREN: |
2128 | paren++; | |
2129 | break; | |
2130 | ||
2131 | case CPP_CLOSE_PAREN: | |
2132 | if (paren-- != 0) | |
2133 | break; | |
2134 | goto out; | |
2135 | ||
2136 | case CPP_COMMA: | |
2137 | /* Commas are not terminators within parantheses or var_args. */ | |
2138 | if (paren || var_args) | |
2139 | break; | |
2140 | goto out; | |
2141 | ||
2142 | case CPP_EOF: /* Error reported by caller. */ | |
2143 | goto out; | |
c5a04734 | 2144 | } |
c5a04734 | 2145 | |
041c3194 ZW |
2146 | raw = pfile->cur_context <= paren_context; |
2147 | if (raw != was_raw) | |
2148 | { | |
2149 | was_raw = raw; | |
2150 | save_token (args, 0); | |
2151 | count++; | |
c5a04734 | 2152 | } |
041c3194 | 2153 | save_token (args, token); |
c5a04734 | 2154 | } |
c5a04734 ZW |
2155 | |
2156 | out: | |
041c3194 ZW |
2157 | if (count == 0) |
2158 | { | |
2159 | /* Duplicate the placemarker. Then we can set its flags and | |
2160 | position and safely be using more than one. */ | |
2161 | save_token (args, duplicate_token (pfile, &placemarker_token)); | |
2162 | count++; | |
2163 | } | |
2164 | ||
2165 | *pcount = count; | |
2166 | return token; | |
c5a04734 ZW |
2167 | } |
2168 | ||
041c3194 ZW |
2169 | /* This macro returns true if the argument starting at offset O of arglist |
2170 | A is empty - that is, it's either a single PLACEMARKER token, or a null | |
2171 | pointer followed by a PLACEMARKER. */ | |
2172 | ||
2173 | #define empty_argument(A, O) \ | |
2174 | ((A)->tokens[O] ? (A)->tokens[O]->type == CPP_PLACEMARKER \ | |
2175 | : (A)->tokens[(O)+1]->type == CPP_PLACEMARKER) | |
2176 | ||
2177 | /* Parse the arguments making up a macro invocation. Nested arguments | |
2178 | are automatically macro expanded, but immediate macros are not | |
2179 | expanded; this enables e.g. operator # to work correctly. Returns | |
2180 | non-zero on error. */ | |
c5a04734 | 2181 | static int |
041c3194 | 2182 | parse_args (pfile, hp, args) |
c5a04734 | 2183 | cpp_reader *pfile; |
041c3194 ZW |
2184 | cpp_hashnode *hp; |
2185 | macro_args *args; | |
c5a04734 | 2186 | { |
041c3194 ZW |
2187 | const cpp_token *token; |
2188 | const cpp_toklist *macro; | |
2189 | unsigned int total = 0; | |
2190 | unsigned int paren_context = pfile->cur_context; | |
2191 | int argc = 0; | |
2192 | ||
2193 | macro = hp->value.expansion; | |
2194 | do | |
c5a04734 | 2195 | { |
041c3194 | 2196 | unsigned int count; |
c5a04734 | 2197 | |
041c3194 ZW |
2198 | token = parse_arg (pfile, (argc + 1 == macro->paramc |
2199 | && (macro->flags & VAR_ARGS)), | |
2200 | paren_context, args, &count); | |
2201 | if (argc < macro->paramc) | |
c5a04734 | 2202 | { |
041c3194 ZW |
2203 | total += count; |
2204 | args->ends[argc] = total; | |
c5a04734 | 2205 | } |
041c3194 | 2206 | argc++; |
c5a04734 | 2207 | } |
041c3194 | 2208 | while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); |
c5a04734 | 2209 | |
041c3194 ZW |
2210 | if (token->type == CPP_EOF) |
2211 | { | |
2212 | cpp_error (pfile, "unterminated invocation of macro \"%.*s\"", | |
2213 | hp->length, hp->name); | |
2214 | return 1; | |
2215 | } | |
2216 | else if (argc < macro->paramc) | |
2217 | { | |
2218 | /* A rest argument is allowed to not appear in the invocation at all. | |
2219 | e.g. #define debug(format, args...) ... | |
2220 | debug("string"); | |
2221 | This is exactly the same as if the rest argument had received no | |
563dd08a | 2222 | tokens - debug("string",); This extension is deprecated. */ |
041c3194 | 2223 | |
563dd08a | 2224 | if (argc + 1 == macro->paramc && (macro->flags & GNU_REST_ARGS)) |
041c3194 ZW |
2225 | { |
2226 | /* Duplicate the placemarker. Then we can set its flags and | |
2227 | position and safely be using more than one. */ | |
2228 | save_token (args, duplicate_token (pfile, &placemarker_token)); | |
2229 | args->ends[argc] = total + 1; | |
2230 | return 0; | |
2231 | } | |
2232 | else | |
2233 | { | |
2234 | cpp_error (pfile, | |
2235 | "insufficient arguments in invocation of macro \"%.*s\"", | |
2236 | hp->length, hp->name); | |
2237 | return 1; | |
2238 | } | |
2239 | } | |
2240 | /* An empty argument to an empty function-like macro is fine. */ | |
2241 | else if (argc > macro->paramc | |
2242 | && !(macro->paramc == 0 && argc == 1 && empty_argument (args, 0))) | |
2243 | { | |
2244 | cpp_error (pfile, | |
2245 | "too many arguments in invocation of macro \"%.*s\"", | |
2246 | hp->length, hp->name); | |
2247 | return 1; | |
2248 | } | |
c5a04734 | 2249 | |
041c3194 ZW |
2250 | return 0; |
2251 | } | |
2252 | ||
2253 | /* Adds backslashes before all backslashes and double quotes appearing | |
2254 | in strings. Non-printable characters are converted to octal. */ | |
2255 | static U_CHAR * | |
2256 | quote_string (dest, src, len) | |
2257 | U_CHAR *dest; | |
2258 | const U_CHAR *src; | |
2259 | unsigned int len; | |
2260 | { | |
2261 | while (len--) | |
c5a04734 | 2262 | { |
041c3194 | 2263 | U_CHAR c = *src++; |
c5a04734 | 2264 | |
041c3194 | 2265 | if (c == '\\' || c == '"') |
6ab3e7dd | 2266 | { |
041c3194 ZW |
2267 | *dest++ = '\\'; |
2268 | *dest++ = c; | |
2269 | } | |
2270 | else | |
2271 | { | |
2272 | if (ISPRINT (c)) | |
2273 | *dest++ = c; | |
2274 | else | |
2275 | { | |
2276 | sprintf ((char *) dest, "\\%03o", c); | |
2277 | dest += 4; | |
2278 | } | |
6ab3e7dd | 2279 | } |
c5a04734 | 2280 | } |
c5a04734 | 2281 | |
041c3194 | 2282 | return dest; |
c5a04734 ZW |
2283 | } |
2284 | ||
041c3194 ZW |
2285 | /* Allocates a buffer to hold a token's TEXT, and converts TOKEN to a |
2286 | CPP_STRING token containing TEXT in quoted form. */ | |
2287 | static cpp_token * | |
2288 | make_string_token (token, text, len) | |
2289 | cpp_token *token; | |
2290 | const U_CHAR *text; | |
2291 | unsigned int len; | |
2292 | { | |
2293 | U_CHAR *buf; | |
2294 | ||
2295 | buf = (U_CHAR *) xmalloc (len * 4); | |
2296 | token->type = CPP_STRING; | |
2297 | token->flags = 0; | |
bfb9dc7f ZW |
2298 | token->val.str.text = buf; |
2299 | token->val.str.len = quote_string (buf, text, len) - buf; | |
041c3194 ZW |
2300 | return token; |
2301 | } | |
2302 | ||
2303 | /* Allocates and converts a temporary token to a CPP_NUMBER token, | |
2304 | evaluating to NUMBER. */ | |
2305 | static cpp_token * | |
2306 | alloc_number_token (pfile, number) | |
c5a04734 | 2307 | cpp_reader *pfile; |
041c3194 | 2308 | int number; |
c5a04734 | 2309 | { |
041c3194 ZW |
2310 | cpp_token *result; |
2311 | char *buf; | |
2312 | ||
2313 | result = get_temp_token (pfile); | |
2314 | buf = xmalloc (20); | |
2315 | sprintf (buf, "%d", number); | |
2316 | ||
2317 | result->type = CPP_NUMBER; | |
2318 | result->flags = 0; | |
bfb9dc7f ZW |
2319 | result->val.str.text = (U_CHAR *) buf; |
2320 | result->val.str.len = strlen (buf); | |
041c3194 ZW |
2321 | return result; |
2322 | } | |
c5a04734 | 2323 | |
041c3194 ZW |
2324 | /* Returns a temporary token from the temporary token store of PFILE. */ |
2325 | static cpp_token * | |
2326 | get_temp_token (pfile) | |
2327 | cpp_reader *pfile; | |
2328 | { | |
2329 | if (pfile->temp_used == pfile->temp_alloced) | |
2330 | { | |
2331 | if (pfile->temp_used == pfile->temp_cap) | |
2332 | { | |
2333 | pfile->temp_cap += pfile->temp_cap + 20; | |
2334 | pfile->temp_tokens = (cpp_token **) xrealloc | |
2335 | (pfile->temp_tokens, pfile->temp_cap * sizeof (cpp_token *)); | |
2336 | } | |
2337 | pfile->temp_tokens[pfile->temp_alloced++] = (cpp_token *) xmalloc | |
2338 | (sizeof (cpp_token)); | |
2339 | } | |
c5a04734 | 2340 | |
041c3194 ZW |
2341 | return pfile->temp_tokens[pfile->temp_used++]; |
2342 | } | |
2343 | ||
2344 | /* Release (not free) for re-use the temporary tokens of PFILE. */ | |
2345 | static void | |
2346 | release_temp_tokens (pfile) | |
2347 | cpp_reader *pfile; | |
2348 | { | |
2349 | while (pfile->temp_used) | |
c5a04734 | 2350 | { |
041c3194 | 2351 | cpp_token *token = pfile->temp_tokens[--pfile->temp_used]; |
c5a04734 | 2352 | |
bfb9dc7f | 2353 | if (token_spellings[token->type].type == SPELL_STRING) |
c5a04734 | 2354 | { |
bfb9dc7f ZW |
2355 | free ((char *) token->val.str.text); |
2356 | token->val.str.text = 0; | |
c5a04734 ZW |
2357 | } |
2358 | } | |
041c3194 | 2359 | } |
c5a04734 | 2360 | |
041c3194 ZW |
2361 | /* Free all of PFILE's dynamically-allocated temporary tokens. */ |
2362 | void | |
2363 | _cpp_free_temp_tokens (pfile) | |
2364 | cpp_reader *pfile; | |
2365 | { | |
2366 | if (pfile->temp_tokens) | |
c5a04734 | 2367 | { |
041c3194 ZW |
2368 | /* It is possible, though unlikely (looking for '(' of a funlike |
2369 | macro into EOF), that we haven't released the tokens yet. */ | |
2370 | release_temp_tokens (pfile); | |
2371 | while (pfile->temp_alloced) | |
2372 | free (pfile->temp_tokens[--pfile->temp_alloced]); | |
2373 | free (pfile->temp_tokens); | |
c5a04734 ZW |
2374 | } |
2375 | ||
041c3194 ZW |
2376 | if (pfile->date) |
2377 | { | |
bfb9dc7f | 2378 | free ((char *) pfile->date->val.str.text); |
041c3194 | 2379 | free (pfile->date); |
bfb9dc7f | 2380 | free ((char *) pfile->time->val.str.text); |
041c3194 ZW |
2381 | free (pfile->time); |
2382 | } | |
c5a04734 ZW |
2383 | } |
2384 | ||
041c3194 ZW |
2385 | /* Copy TOKEN into a temporary token from PFILE's store. */ |
2386 | static cpp_token * | |
2387 | duplicate_token (pfile, token) | |
2388 | cpp_reader *pfile; | |
2389 | const cpp_token *token; | |
2390 | { | |
2391 | cpp_token *result = get_temp_token (pfile); | |
c5a04734 | 2392 | |
041c3194 | 2393 | *result = *token; |
bfb9dc7f | 2394 | if (token_spellings[token->type].type == SPELL_STRING) |
041c3194 | 2395 | { |
bfb9dc7f ZW |
2396 | U_CHAR *buff = (U_CHAR *) xmalloc (token->val.str.len); |
2397 | memcpy (buff, token->val.str.text, token->val.str.len); | |
2398 | result->val.str.text = buff; | |
041c3194 ZW |
2399 | } |
2400 | return result; | |
2401 | } | |
c5a04734 | 2402 | |
041c3194 ZW |
2403 | /* Determine whether two tokens can be pasted together, and if so, |
2404 | what the resulting token is. Returns CPP_EOF if the tokens cannot | |
2405 | be pasted, or the appropriate type for the merged token if they | |
2406 | can. */ | |
2407 | static enum cpp_ttype | |
2408 | can_paste (pfile, token1, token2, digraph) | |
2409 | cpp_reader * pfile; | |
2410 | const cpp_token *token1, *token2; | |
2411 | int* digraph; | |
c5a04734 | 2412 | { |
041c3194 ZW |
2413 | enum cpp_ttype a = token1->type, b = token2->type; |
2414 | int cxx = CPP_OPTION (pfile, cplusplus); | |
c5a04734 | 2415 | |
041c3194 ZW |
2416 | if (a <= CPP_LAST_EQ && b == CPP_EQ) |
2417 | return a + (CPP_EQ_EQ - CPP_EQ); | |
c5a04734 | 2418 | |
041c3194 | 2419 | switch (a) |
c5a04734 | 2420 | { |
041c3194 ZW |
2421 | case CPP_GREATER: |
2422 | if (b == a) return CPP_RSHIFT; | |
2423 | if (b == CPP_QUERY && cxx) return CPP_MAX; | |
2424 | if (b == CPP_GREATER_EQ) return CPP_RSHIFT_EQ; | |
2425 | break; | |
2426 | case CPP_LESS: | |
2427 | if (b == a) return CPP_LSHIFT; | |
2428 | if (b == CPP_QUERY && cxx) return CPP_MIN; | |
2429 | if (b == CPP_LESS_EQ) return CPP_LSHIFT_EQ; | |
9b55f29a NB |
2430 | if (CPP_OPTION (pfile, digraphs)) |
2431 | { | |
2432 | if (b == CPP_COLON) | |
2433 | {*digraph = 1; return CPP_OPEN_SQUARE;} /* <: digraph */ | |
2434 | if (b == CPP_MOD) | |
2435 | {*digraph = 1; return CPP_OPEN_BRACE;} /* <% digraph */ | |
2436 | } | |
041c3194 | 2437 | break; |
c5a04734 | 2438 | |
041c3194 ZW |
2439 | case CPP_PLUS: if (b == a) return CPP_PLUS_PLUS; break; |
2440 | case CPP_AND: if (b == a) return CPP_AND_AND; break; | |
2441 | case CPP_OR: if (b == a) return CPP_OR_OR; break; | |
c5a04734 | 2442 | |
041c3194 ZW |
2443 | case CPP_MINUS: |
2444 | if (b == a) return CPP_MINUS_MINUS; | |
2445 | if (b == CPP_GREATER) return CPP_DEREF; | |
2446 | break; | |
2447 | case CPP_COLON: | |
2448 | if (b == a && cxx) return CPP_SCOPE; | |
9b55f29a | 2449 | if (b == CPP_GREATER && CPP_OPTION (pfile, digraphs)) |
041c3194 ZW |
2450 | {*digraph = 1; return CPP_CLOSE_SQUARE;} /* :> digraph */ |
2451 | break; | |
2452 | ||
2453 | case CPP_MOD: | |
9b55f29a NB |
2454 | if (CPP_OPTION (pfile, digraphs)) |
2455 | { | |
2456 | if (b == CPP_GREATER) | |
2457 | {*digraph = 1; return CPP_CLOSE_BRACE;} /* %> digraph */ | |
2458 | if (b == CPP_COLON) | |
2459 | {*digraph = 1; return CPP_HASH;} /* %: digraph */ | |
2460 | } | |
041c3194 ZW |
2461 | break; |
2462 | case CPP_DEREF: | |
2463 | if (b == CPP_MULT && cxx) return CPP_DEREF_STAR; | |
2464 | break; | |
2465 | case CPP_DOT: | |
2466 | if (b == CPP_MULT && cxx) return CPP_DOT_STAR; | |
2467 | if (b == CPP_NUMBER) return CPP_NUMBER; | |
2468 | break; | |
2469 | ||
2470 | case CPP_HASH: | |
2471 | if (b == a && (token1->flags & DIGRAPH) == (token2->flags & DIGRAPH)) | |
2472 | /* %:%: digraph */ | |
2473 | {*digraph = (token1->flags & DIGRAPH); return CPP_PASTE;} | |
2474 | break; | |
2475 | ||
2476 | case CPP_NAME: | |
2477 | if (b == CPP_NAME) return CPP_NAME; | |
2478 | if (b == CPP_NUMBER | |
bfb9dc7f | 2479 | && is_numstart(token2->val.str.text[0])) return CPP_NAME; |
041c3194 | 2480 | if (b == CPP_CHAR |
bfb9dc7f | 2481 | && token1->val.node == pfile->spec_nodes->n_L) return CPP_WCHAR; |
041c3194 | 2482 | if (b == CPP_STRING |
bfb9dc7f | 2483 | && token1->val.node == pfile->spec_nodes->n_L) return CPP_WSTRING; |
041c3194 ZW |
2484 | break; |
2485 | ||
2486 | case CPP_NUMBER: | |
2487 | if (b == CPP_NUMBER) return CPP_NUMBER; | |
2488 | if (b == CPP_NAME) return CPP_NUMBER; | |
2489 | if (b == CPP_DOT) return CPP_NUMBER; | |
2490 | /* Numbers cannot have length zero, so this is safe. */ | |
2491 | if ((b == CPP_PLUS || b == CPP_MINUS) | |
bfb9dc7f | 2492 | && VALID_SIGN ('+', token1->val.str.text[token1->val.str.len - 1])) |
041c3194 ZW |
2493 | return CPP_NUMBER; |
2494 | break; | |
2495 | ||
2496 | default: | |
2497 | break; | |
c5a04734 ZW |
2498 | } |
2499 | ||
041c3194 ZW |
2500 | return CPP_EOF; |
2501 | } | |
2502 | ||
2503 | /* Check if TOKEN is to be ##-pasted with the token after it. */ | |
2504 | static const cpp_token * | |
2505 | maybe_paste_with_next (pfile, token) | |
2506 | cpp_reader *pfile; | |
2507 | const cpp_token *token; | |
2508 | { | |
2509 | cpp_token *pasted; | |
2510 | const cpp_token *second; | |
2511 | cpp_context *context = CURRENT_CONTEXT (pfile); | |
2512 | ||
2513 | /* Is this token on the LHS of ## ? */ | |
2514 | if (!((context->flags & CONTEXT_PASTEL) && context->posn == context->count) | |
2515 | && !(token->flags & PASTE_LEFT)) | |
2516 | return token; | |
2517 | ||
2518 | /* Prevent recursion, and possibly pushing back more than one token. */ | |
2519 | if (pfile->paste_level) | |
2520 | return token; | |
2521 | ||
2522 | /* Suppress macro expansion for next token, but don't conflict with | |
2523 | the other method of suppression. If it is an argument, macro | |
2524 | expansion within the argument will still occur. */ | |
2525 | pfile->paste_level = pfile->cur_context; | |
2526 | second = cpp_get_token (pfile); | |
2527 | pfile->paste_level = 0; | |
2528 | ||
563dd08a NB |
2529 | /* Ignore placemarker argument tokens (cannot be from an empty macro |
2530 | since macros are not expanded). */ | |
041c3194 ZW |
2531 | if (token->type == CPP_PLACEMARKER) |
2532 | pasted = duplicate_token (pfile, second); | |
2533 | else if (second->type == CPP_PLACEMARKER) | |
c5a04734 | 2534 | { |
563dd08a | 2535 | cpp_context *mac_context = CURRENT_CONTEXT (pfile) - 1; |
041c3194 ZW |
2536 | /* GCC has special extended semantics for a ## b where b is a |
2537 | varargs parameter: a disappears if b consists of no tokens. | |
2538 | This extension is deprecated. */ | |
563dd08a NB |
2539 | if ((mac_context->u.list->flags & GNU_REST_ARGS) |
2540 | && (mac_context->u.list->tokens[mac_context->posn - 1].val.aux + 1 | |
2541 | == (unsigned) mac_context->u.list->paramc)) | |
041c3194 ZW |
2542 | { |
2543 | cpp_warning (pfile, "deprecated GNU ## extension used"); | |
2544 | pasted = duplicate_token (pfile, second); | |
2545 | } | |
2546 | else | |
2547 | pasted = duplicate_token (pfile, token); | |
c5a04734 | 2548 | } |
041c3194 ZW |
2549 | else |
2550 | { | |
2551 | int digraph = 0; | |
2552 | enum cpp_ttype type = can_paste (pfile, token, second, &digraph); | |
c5a04734 | 2553 | |
041c3194 ZW |
2554 | if (type == CPP_EOF) |
2555 | { | |
2556 | if (CPP_OPTION (pfile, warn_paste)) | |
2557 | cpp_warning (pfile, | |
2558 | "pasting would not give a valid preprocessing token"); | |
2559 | _cpp_push_token (pfile, second); | |
2560 | return token; | |
2561 | } | |
c5a04734 | 2562 | |
041c3194 ZW |
2563 | if (type == CPP_NAME || type == CPP_NUMBER) |
2564 | { | |
2565 | /* Join spellings. */ | |
bfb9dc7f | 2566 | U_CHAR *buf, *end; |
c5a04734 | 2567 | |
041c3194 | 2568 | pasted = get_temp_token (pfile); |
bfb9dc7f ZW |
2569 | buf = (U_CHAR *) alloca (TOKEN_LEN (token) + TOKEN_LEN (second)); |
2570 | end = spell_token (pfile, token, buf); | |
2571 | end = spell_token (pfile, second, end); | |
2572 | *end = '\0'; | |
041c3194 | 2573 | |
bfb9dc7f ZW |
2574 | if (type == CPP_NAME) |
2575 | pasted->val.node = cpp_lookup (pfile, buf, end - buf); | |
2576 | else | |
2577 | { | |
2578 | pasted->val.str.text = uxstrdup (buf); | |
2579 | pasted->val.str.len = end - buf; | |
2580 | } | |
041c3194 ZW |
2581 | } |
2582 | else if (type == CPP_WCHAR || type == CPP_WSTRING) | |
2583 | pasted = duplicate_token (pfile, second); | |
2584 | else | |
2585 | { | |
2586 | pasted = get_temp_token (pfile); | |
2587 | pasted->val.integer = 0; | |
2588 | } | |
2589 | ||
2590 | pasted->type = type; | |
bfb9dc7f | 2591 | pasted->flags = digraph ? DIGRAPH : 0; |
041c3194 ZW |
2592 | } |
2593 | ||
2594 | /* The pasted token gets the whitespace flags and position of the | |
2595 | first token, the PASTE_LEFT flag of the second token, plus the | |
2596 | PASTED flag to indicate it is the result of a paste. However, we | |
2597 | want to preserve the DIGRAPH flag. */ | |
2598 | pasted->flags &= ~(PREV_WHITE | BOL | PASTE_LEFT); | |
2599 | pasted->flags |= ((token->flags & (PREV_WHITE | BOL)) | |
2600 | | (second->flags & PASTE_LEFT) | PASTED); | |
2601 | pasted->col = token->col; | |
2602 | pasted->line = token->line; | |
2603 | ||
2604 | return maybe_paste_with_next (pfile, pasted); | |
2605 | } | |
2606 | ||
2607 | /* Convert a token sequence to a single string token according to the | |
2608 | rules of the ISO C #-operator. */ | |
2609 | #define INIT_SIZE 200 | |
2610 | static cpp_token * | |
2611 | stringify_arg (pfile, token) | |
c5a04734 | 2612 | cpp_reader *pfile; |
041c3194 | 2613 | const cpp_token *token; |
c5a04734 | 2614 | { |
041c3194 ZW |
2615 | cpp_token *result; |
2616 | unsigned char *main_buf; | |
2617 | unsigned int prev_value, backslash_count = 0; | |
2618 | unsigned int buf_used = 0, whitespace = 0, buf_cap = INIT_SIZE; | |
c5a04734 | 2619 | |
041c3194 ZW |
2620 | prev_value = prevent_macro_expansion (pfile); |
2621 | main_buf = (unsigned char *) xmalloc (buf_cap); | |
c5a04734 | 2622 | |
041c3194 ZW |
2623 | result = get_temp_token (pfile); |
2624 | ASSIGN_FLAGS_AND_POS (result, token); | |
2625 | ||
2626 | for (; (token = cpp_get_token (pfile))->type != CPP_EOF; ) | |
c5a04734 | 2627 | { |
041c3194 ZW |
2628 | int escape; |
2629 | unsigned char *buf; | |
2630 | unsigned int len = TOKEN_LEN (token); | |
c5a04734 | 2631 | |
041c3194 ZW |
2632 | escape = (token->type == CPP_STRING || token->type == CPP_WSTRING |
2633 | || token->type == CPP_CHAR || token->type == CPP_WCHAR); | |
2634 | if (escape) | |
2635 | len *= 4 + 1; | |
2636 | ||
2637 | if (buf_used + len > buf_cap) | |
c5a04734 | 2638 | { |
041c3194 ZW |
2639 | buf_cap = buf_used + len + INIT_SIZE; |
2640 | main_buf = xrealloc (main_buf, buf_cap); | |
2641 | } | |
c5a04734 | 2642 | |
041c3194 ZW |
2643 | if (whitespace && (token->flags & PREV_WHITE)) |
2644 | main_buf[buf_used++] = ' '; | |
c5a04734 | 2645 | |
041c3194 ZW |
2646 | if (escape) |
2647 | buf = (unsigned char *) xmalloc (len); | |
2648 | else | |
2649 | buf = main_buf + buf_used; | |
2650 | ||
2651 | len = spell_token (pfile, token, buf) - buf; | |
2652 | if (escape) | |
2653 | { | |
2654 | buf_used = quote_string (&main_buf[buf_used], buf, len) - main_buf; | |
2655 | free (buf); | |
2656 | } | |
2657 | else | |
2658 | buf_used += len; | |
c5a04734 | 2659 | |
041c3194 ZW |
2660 | whitespace = 1; |
2661 | if (token->type == CPP_BACKSLASH) | |
2662 | backslash_count++; | |
2663 | else | |
2664 | backslash_count = 0; | |
2665 | } | |
c5a04734 | 2666 | |
041c3194 ZW |
2667 | /* Ignore the final \ of invalid string literals. */ |
2668 | if (backslash_count & 1) | |
2669 | { | |
2670 | cpp_warning (pfile, "invalid string literal, ignoring final '\\'"); | |
2671 | buf_used--; | |
2672 | } | |
c5a04734 | 2673 | |
041c3194 | 2674 | result->type = CPP_STRING; |
bfb9dc7f ZW |
2675 | result->val.str.text = main_buf; |
2676 | result->val.str.len = buf_used; | |
041c3194 ZW |
2677 | restore_macro_expansion (pfile, prev_value); |
2678 | return result; | |
2679 | } | |
c5a04734 | 2680 | |
041c3194 ZW |
2681 | /* Allocate more room on the context stack of PFILE. */ |
2682 | static void | |
2683 | expand_context_stack (pfile) | |
2684 | cpp_reader *pfile; | |
2685 | { | |
2686 | pfile->context_cap += pfile->context_cap + 20; | |
2687 | pfile->contexts = (cpp_context *) | |
2688 | xrealloc (pfile->contexts, pfile->context_cap * sizeof (cpp_context)); | |
2689 | } | |
c5a04734 | 2690 | |
041c3194 ZW |
2691 | /* Push the context of macro NODE onto the context stack. TOKEN is |
2692 | the CPP_NAME token invoking the macro. */ | |
2693 | static const cpp_token * | |
2694 | push_macro_context (pfile, node, token) | |
2695 | cpp_reader *pfile; | |
2696 | cpp_hashnode *node; | |
2697 | const cpp_token *token; | |
2698 | { | |
2699 | unsigned char orig_flags; | |
2700 | macro_args *args; | |
2701 | cpp_context *context; | |
c5a04734 | 2702 | |
041c3194 | 2703 | if (pfile->cur_context > CPP_STACK_MAX) |
c5a04734 | 2704 | { |
041c3194 ZW |
2705 | cpp_error (pfile, "infinite macro recursion invoking '%s'", node->name); |
2706 | return token; | |
c5a04734 ZW |
2707 | } |
2708 | ||
041c3194 ZW |
2709 | /* Token's flags may change when parsing args containing a nested |
2710 | invocation of this macro. */ | |
2711 | orig_flags = token->flags & (PREV_WHITE | BOL); | |
2712 | args = 0; | |
2713 | if (node->value.expansion->paramc >= 0) | |
c5a04734 | 2714 | { |
041c3194 ZW |
2715 | unsigned int error, prev_nme; |
2716 | ||
2717 | /* Allocate room for the argument contexts, and parse them. */ | |
2718 | args = (macro_args *) xmalloc (sizeof (macro_args)); | |
2719 | args->ends = (unsigned int *) | |
2720 | xmalloc (node->value.expansion->paramc * sizeof (unsigned int)); | |
2721 | args->tokens = 0; | |
2722 | args->capacity = 0; | |
2723 | args->used = 0; | |
2724 | args->level = pfile->cur_context; | |
2725 | ||
2726 | prev_nme = prevent_macro_expansion (pfile); | |
2727 | pfile->args = args; | |
2728 | error = parse_args (pfile, node, args); | |
2729 | pfile->args = 0; | |
2730 | restore_macro_expansion (pfile, prev_nme); | |
2731 | if (error) | |
2732 | { | |
2733 | free_macro_args (args); | |
2734 | return token; | |
2735 | } | |
c5a04734 | 2736 | } |
c5a04734 | 2737 | |
041c3194 ZW |
2738 | /* Now push its context. */ |
2739 | pfile->cur_context++; | |
2740 | if (pfile->cur_context == pfile->context_cap) | |
2741 | expand_context_stack (pfile); | |
2742 | ||
2743 | context = CURRENT_CONTEXT (pfile); | |
2744 | context->u.list = node->value.expansion; | |
2745 | context->args = args; | |
2746 | context->posn = 0; | |
2747 | context->count = context->u.list->tokens_used; | |
2748 | context->level = pfile->cur_context; | |
2749 | context->flags = 0; | |
2750 | context->pushed_token = 0; | |
2751 | ||
2752 | /* Set the flags of the first token. We know there must | |
2753 | be one, empty macros are a single placemarker token. */ | |
2754 | MODIFY_FLAGS_AND_POS (&context->u.list->tokens[0], token, orig_flags); | |
2755 | ||
2756 | return cpp_get_token (pfile); | |
c5a04734 ZW |
2757 | } |
2758 | ||
041c3194 ZW |
2759 | /* Push an argument to the current macro onto the context stack. |
2760 | TOKEN is the MACRO_ARG token representing the argument expansion. */ | |
2761 | static const cpp_token * | |
2762 | push_arg_context (pfile, token) | |
2763 | cpp_reader *pfile; | |
2764 | const cpp_token *token; | |
c5a04734 | 2765 | { |
041c3194 ZW |
2766 | cpp_context *context; |
2767 | macro_args *args; | |
2768 | ||
2769 | pfile->cur_context++; | |
2770 | if (pfile->cur_context == pfile->context_cap) | |
2771 | expand_context_stack (pfile); | |
2772 | ||
2773 | context = CURRENT_CONTEXT (pfile); | |
2774 | args = context[-1].args; | |
2775 | ||
2776 | context->count = token->val.aux ? args->ends[token->val.aux - 1]: 0; | |
2777 | context->u.arg = args->tokens + context->count; | |
2778 | context->count = args->ends[token->val.aux] - context->count; | |
2779 | context->args = 0; | |
2780 | context->posn = 0; | |
2781 | context->level = args->level; | |
2782 | context->flags = CONTEXT_ARG | CONTEXT_RAW; | |
2783 | context->pushed_token = 0; | |
2784 | ||
2785 | /* Set the flags of the first token. There is one. */ | |
2786 | { | |
2787 | const cpp_token *first = context->u.arg[0]; | |
2788 | if (!first) | |
2789 | first = context->u.arg[1]; | |
c5a04734 | 2790 | |
041c3194 ZW |
2791 | MODIFY_FLAGS_AND_POS ((cpp_token *) first, token, |
2792 | token->flags & (PREV_WHITE | BOL)); | |
2793 | } | |
c5a04734 | 2794 | |
041c3194 ZW |
2795 | if (token->flags & STRINGIFY_ARG) |
2796 | return stringify_arg (pfile, token); | |
c5a04734 | 2797 | |
041c3194 ZW |
2798 | if (token->flags & PASTE_LEFT) |
2799 | context->flags |= CONTEXT_PASTEL; | |
2800 | if (pfile->paste_level) | |
2801 | context->flags |= CONTEXT_PASTER; | |
d1d9a6bd | 2802 | |
041c3194 | 2803 | return get_raw_token (pfile); |
c5a04734 ZW |
2804 | } |
2805 | ||
041c3194 ZW |
2806 | /* "Unget" a token. It is effectively inserted in the token queue and |
2807 | will be returned by the next call to get_raw_token. */ | |
c5a04734 | 2808 | void |
041c3194 | 2809 | _cpp_push_token (pfile, token) |
c5a04734 | 2810 | cpp_reader *pfile; |
041c3194 | 2811 | const cpp_token *token; |
c5a04734 | 2812 | { |
041c3194 ZW |
2813 | cpp_context *context = CURRENT_CONTEXT (pfile); |
2814 | if (context->pushed_token) | |
2815 | cpp_ice (pfile, "two tokens pushed in a row"); | |
2816 | if (token->type != CPP_EOF) | |
2817 | context->pushed_token = token; | |
2818 | /* Don't push back a directive's CPP_EOF, step back instead. */ | |
2819 | else if (pfile->cur_context == 0) | |
2820 | pfile->contexts[0].posn--; | |
2821 | } | |
c5a04734 | 2822 | |
041c3194 ZW |
2823 | /* Handle a preprocessing directive. TOKEN is the CPP_HASH token |
2824 | introducing the directive. */ | |
2825 | static void | |
2826 | process_directive (pfile, token) | |
2827 | cpp_reader *pfile; | |
2828 | const cpp_token *token; | |
2829 | { | |
2830 | const struct directive *d = pfile->token_list.directive; | |
2831 | int prev_nme = 0; | |
2832 | ||
2833 | /* Skip over the directive name. */ | |
2834 | if (token[1].type == CPP_NAME) | |
2835 | _cpp_get_raw_token (pfile); | |
2836 | else if (token[1].type != CPP_NUMBER) | |
2837 | cpp_ice (pfile, "directive begins with %s?!", | |
2838 | token_names[token[1].type]); | |
2839 | ||
2840 | /* Flush pending tokens at this point, in case the directive produces | |
2841 | output. XXX Directive output won't be visible to a direct caller of | |
2842 | cpp_get_token. */ | |
2843 | if (pfile->printer && CPP_WRITTEN (pfile) - pfile->printer->written) | |
2844 | cpp_output_tokens (pfile, pfile->printer, pfile->token_list.line); | |
2845 | ||
2846 | if (! (d->flags & EXPAND)) | |
2847 | prev_nme = prevent_macro_expansion (pfile); | |
2848 | (void) (*d->handler) (pfile); | |
2849 | if (! (d->flags & EXPAND)) | |
2850 | restore_macro_expansion (pfile, prev_nme); | |
2851 | _cpp_skip_rest_of_line (pfile); | |
2852 | } | |
c5a04734 | 2853 | |
041c3194 ZW |
2854 | /* The external interface to return the next token. All macro |
2855 | expansion and directive processing is handled internally, the | |
2856 | caller only ever sees the output after preprocessing. */ | |
2857 | const cpp_token * | |
2858 | cpp_get_token (pfile) | |
2859 | cpp_reader *pfile; | |
2860 | { | |
2861 | const cpp_token *token; | |
2862 | cpp_hashnode *node; | |
6ab3e7dd | 2863 | |
041c3194 ZW |
2864 | /* Loop till we hit a non-directive, non-skipped, non-placemarker token. */ |
2865 | for (;;) | |
2866 | { | |
2867 | token = get_raw_token (pfile); | |
2868 | if (token->flags & BOL && token->type == CPP_HASH | |
2869 | && pfile->token_list.directive) | |
c5a04734 | 2870 | { |
041c3194 ZW |
2871 | process_directive (pfile, token); |
2872 | continue; | |
c5a04734 ZW |
2873 | } |
2874 | ||
041c3194 ZW |
2875 | /* Short circuit EOF. */ |
2876 | if (token->type == CPP_EOF) | |
2877 | return token; | |
2878 | ||
2879 | if (pfile->skipping && ! pfile->token_list.directive) | |
c5a04734 | 2880 | { |
041c3194 ZW |
2881 | _cpp_skip_rest_of_line (pfile); |
2882 | continue; | |
2883 | } | |
2884 | break; | |
2885 | } | |
c5a04734 | 2886 | |
041c3194 ZW |
2887 | /* If there's a potential control macro and we get here, then that |
2888 | #ifndef didn't cover the entire file and its argument shouldn't | |
2889 | be taken as a control macro. */ | |
2890 | pfile->potential_control_macro = 0; | |
c5a04734 | 2891 | |
041c3194 | 2892 | token = maybe_paste_with_next (pfile, token); |
c5a04734 | 2893 | |
041c3194 ZW |
2894 | if (token->type != CPP_NAME) |
2895 | return token; | |
c5a04734 | 2896 | |
041c3194 ZW |
2897 | /* Is macro expansion disabled in general? */ |
2898 | if (pfile->no_expand_level == pfile->cur_context || pfile->paste_level) | |
2899 | return token; | |
2900 | ||
bfb9dc7f | 2901 | node = token->val.node; |
041c3194 ZW |
2902 | if (node->type == T_VOID) |
2903 | return token; | |
c5a04734 | 2904 | |
041c3194 ZW |
2905 | if (node->type == T_MACRO) |
2906 | { | |
2907 | if (is_macro_disabled (pfile, node->value.expansion, token)) | |
2908 | return token; | |
c5a04734 | 2909 | |
041c3194 ZW |
2910 | return push_macro_context (pfile, node, token); |
2911 | } | |
2912 | else | |
2913 | return special_symbol (pfile, node, token); | |
2914 | } | |
c5a04734 | 2915 | |
041c3194 ZW |
2916 | /* Returns the next raw token, i.e. without performing macro |
2917 | expansion. Argument contexts are automatically entered. */ | |
2918 | static const cpp_token * | |
2919 | get_raw_token (pfile) | |
2920 | cpp_reader *pfile; | |
2921 | { | |
2922 | const cpp_token *result; | |
2923 | cpp_context *context = CURRENT_CONTEXT (pfile); | |
c5a04734 | 2924 | |
041c3194 ZW |
2925 | if (context->pushed_token) |
2926 | { | |
2927 | result = context->pushed_token; | |
2928 | context->pushed_token = 0; | |
2929 | } | |
2930 | else if (context->posn == context->count) | |
2931 | result = pop_context (pfile); | |
2932 | else | |
2933 | { | |
2934 | if (IS_ARG_CONTEXT (context)) | |
2935 | { | |
2936 | result = context->u.arg[context->posn++]; | |
2937 | if (result == 0) | |
c5a04734 | 2938 | { |
041c3194 ZW |
2939 | context->flags ^= CONTEXT_RAW; |
2940 | result = context->u.arg[context->posn++]; | |
c5a04734 | 2941 | } |
041c3194 ZW |
2942 | return result; /* Cannot be a CPP_MACRO_ARG */ |
2943 | } | |
2944 | result = &context->u.list->tokens[context->posn++]; | |
2945 | } | |
c5a04734 | 2946 | |
041c3194 ZW |
2947 | if (result->type == CPP_MACRO_ARG) |
2948 | result = push_arg_context (pfile, result); | |
2949 | return result; | |
2950 | } | |
c5a04734 | 2951 | |
041c3194 ZW |
2952 | /* Internal interface to get the token without macro expanding. */ |
2953 | const cpp_token * | |
2954 | _cpp_get_raw_token (pfile) | |
2955 | cpp_reader *pfile; | |
2956 | { | |
2957 | int prev_nme = prevent_macro_expansion (pfile); | |
2958 | const cpp_token *result = cpp_get_token (pfile); | |
2959 | restore_macro_expansion (pfile, prev_nme); | |
2960 | return result; | |
2961 | } | |
c5a04734 | 2962 | |
041c3194 ZW |
2963 | /* A thin wrapper to lex_line. CLEAR is non-zero if the current token |
2964 | list should be overwritten, or zero if we need to append | |
2965 | (typically, if we are within the arguments to a macro, or looking | |
2966 | for the '(' to start a function-like macro invocation). */ | |
2967 | static int | |
2968 | lex_next (pfile, clear) | |
2969 | cpp_reader *pfile; | |
2970 | int clear; | |
2971 | { | |
2972 | cpp_toklist *list = &pfile->token_list; | |
2973 | const cpp_token *old_list = list->tokens; | |
2974 | unsigned int old_used = list->tokens_used; | |
c5a04734 | 2975 | |
91fcd158 NB |
2976 | /* If we are currently processing a directive, do not advance. 6.10 |
2977 | paragraph 2: A new-line character ends the directive even if it | |
2978 | occurs within what would otherwise be an invocation of a | |
2979 | function-like macro. | |
2980 | ||
2981 | It is possible that clear == 1 too; e.g. "#if funlike_macro (" | |
2982 | since parse_args swallowed the directive's EOF. */ | |
2983 | if (list->directive) | |
2984 | return 1; | |
2985 | ||
041c3194 | 2986 | if (clear) |
c5a04734 | 2987 | { |
041c3194 ZW |
2988 | /* Release all temporary tokens. */ |
2989 | _cpp_clear_toklist (list); | |
2990 | pfile->contexts[0].posn = 0; | |
2991 | if (pfile->temp_used) | |
2992 | release_temp_tokens (pfile); | |
c5a04734 | 2993 | } |
041c3194 ZW |
2994 | |
2995 | lex_line (pfile, list); | |
2996 | pfile->contexts[0].count = list->tokens_used; | |
c5a04734 | 2997 | |
041c3194 | 2998 | if (!clear && pfile->args) |
c5a04734 | 2999 | { |
041c3194 ZW |
3000 | /* Fix up argument token pointers. */ |
3001 | if (old_list != list->tokens) | |
3002 | { | |
3003 | unsigned int i; | |
3004 | ||
3005 | for (i = 0; i < pfile->args->used; i++) | |
3006 | { | |
3007 | const cpp_token *token = pfile->args->tokens[i]; | |
3008 | if (token >= old_list && token < old_list + old_used) | |
3009 | pfile->args->tokens[i] = (const cpp_token *) | |
3010 | ((char *) token + ((char *) list->tokens - (char *) old_list)); | |
3011 | } | |
3012 | } | |
3013 | ||
3014 | /* 6.10.3 paragraph 11: If there are sequences of preprocessing | |
3015 | tokens within the list of arguments that would otherwise act as | |
3016 | preprocessing directives, the behavior is undefined. | |
3017 | ||
3018 | This implementation will report a hard error and treat the | |
3019 | 'sequence of preprocessing tokens' as part of the macro argument, | |
3020 | not a directive. | |
3021 | ||
3022 | Note if pfile->args == 0, we're OK since we're only inside a | |
3023 | macro argument after a '('. */ | |
3024 | if (list->directive) | |
3025 | { | |
3026 | cpp_error_with_line (pfile, list->tokens[old_used].line, | |
3027 | list->tokens[old_used].col, | |
3028 | "#%s may not be used inside a macro argument", | |
3029 | list->directive->name); | |
91fcd158 | 3030 | return 1; |
041c3194 | 3031 | } |
c5a04734 ZW |
3032 | } |
3033 | ||
041c3194 | 3034 | return 0; |
c5a04734 ZW |
3035 | } |
3036 | ||
041c3194 ZW |
3037 | /* Pops a context of the context stack. If we're at the bottom, lexes |
3038 | the next logical line. Returns 1 if we're at the end of the | |
3039 | argument list to the # operator, or if it is illegal to "overflow" | |
3040 | into the rest of the file (e.g. 6.10.3.1.1). */ | |
3041 | static int | |
3042 | do_pop_context (pfile) | |
3043 | cpp_reader *pfile; | |
3044 | { | |
3045 | cpp_context *context; | |
3fef5b2b | 3046 | |
041c3194 ZW |
3047 | if (pfile->cur_context == 0) |
3048 | return lex_next (pfile, pfile->no_expand_level == UINT_MAX); | |
3049 | ||
3050 | /* Argument contexts, when parsing args or handling # operator | |
3051 | return CPP_EOF at the end. */ | |
3052 | context = CURRENT_CONTEXT (pfile); | |
3053 | if (IS_ARG_CONTEXT (context) && pfile->cur_context == pfile->no_expand_level) | |
3054 | return 1; | |
3055 | ||
3056 | /* Free resources when leaving macro contexts. */ | |
3057 | if (context->args) | |
3058 | free_macro_args (context->args); | |
3059 | ||
3060 | if (pfile->cur_context == pfile->no_expand_level) | |
3061 | pfile->no_expand_level--; | |
3062 | pfile->cur_context--; | |
3063 | ||
3064 | return 0; | |
3065 | } | |
3066 | ||
3067 | /* Move down the context stack, and return the next raw token. */ | |
3068 | static const cpp_token * | |
3069 | pop_context (pfile) | |
3070 | cpp_reader *pfile; | |
3071 | { | |
3072 | if (do_pop_context (pfile)) | |
3073 | return &eof_token; | |
3074 | return get_raw_token (pfile); | |
3075 | } | |
3076 | ||
3077 | /* Turn off macro expansion at the current context level. */ | |
3078 | static unsigned int | |
3079 | prevent_macro_expansion (pfile) | |
3080 | cpp_reader *pfile; | |
3081 | { | |
3082 | unsigned int prev_value = pfile->no_expand_level; | |
3083 | pfile->no_expand_level = pfile->cur_context; | |
3084 | return prev_value; | |
3085 | } | |
3086 | ||
3087 | /* Restore macro expansion to its previous state. */ | |
3088 | static void | |
3089 | restore_macro_expansion (pfile, prev_value) | |
3090 | cpp_reader *pfile; | |
3091 | unsigned int prev_value; | |
3092 | { | |
3093 | pfile->no_expand_level = prev_value; | |
3094 | } | |
3095 | ||
3096 | /* Used by cpperror.c to obtain the correct line and column to report | |
3097 | in a diagnostic. */ | |
3098 | unsigned int | |
3099 | _cpp_get_line (pfile, pcol) | |
3100 | cpp_reader *pfile; | |
3101 | unsigned int *pcol; | |
3102 | { | |
3103 | unsigned int index; | |
3104 | const cpp_token *cur_token; | |
3105 | ||
3106 | if (pfile->in_lex_line) | |
3107 | index = pfile->token_list.tokens_used; | |
3108 | else | |
3109 | index = pfile->contexts[0].posn; | |
3110 | ||
3111 | cur_token = &pfile->token_list.tokens[index - 1]; | |
3112 | if (pcol) | |
3113 | *pcol = cur_token->col; | |
3114 | return cur_token->line; | |
3115 | } | |
3116 | ||
3117 | #define DSC(str) (const U_CHAR *)str, sizeof str - 1 | |
3118 | static const char * const monthnames[] = | |
3119 | { | |
3120 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
3121 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", | |
3122 | }; | |
3123 | ||
3124 | /* Handle builtin macros like __FILE__. */ | |
3125 | static const cpp_token * | |
3126 | special_symbol (pfile, node, token) | |
3127 | cpp_reader *pfile; | |
3128 | cpp_hashnode *node; | |
d1d9a6bd | 3129 | const cpp_token *token; |
3fef5b2b | 3130 | { |
041c3194 ZW |
3131 | cpp_token *result; |
3132 | cpp_buffer *ip; | |
3fef5b2b | 3133 | |
041c3194 | 3134 | switch (node->type) |
3fef5b2b | 3135 | { |
041c3194 ZW |
3136 | case T_FILE: |
3137 | case T_BASE_FILE: | |
3fef5b2b | 3138 | { |
041c3194 | 3139 | const char *file; |
3fef5b2b | 3140 | |
041c3194 ZW |
3141 | ip = CPP_BUFFER (pfile); |
3142 | if (ip == 0) | |
3143 | file = ""; | |
3fef5b2b | 3144 | else |
041c3194 ZW |
3145 | { |
3146 | if (node->type == T_BASE_FILE) | |
3147 | while (CPP_PREV_BUFFER (ip) != NULL) | |
3148 | ip = CPP_PREV_BUFFER (ip); | |
3149 | ||
3150 | file = ip->nominal_fname; | |
3151 | } | |
3152 | result = make_string_token (get_temp_token (pfile), (U_CHAR *) file, | |
3153 | strlen (file)); | |
3154 | } | |
3155 | break; | |
3fef5b2b | 3156 | |
041c3194 ZW |
3157 | case T_INCLUDE_LEVEL: |
3158 | { | |
3159 | int true_indepth = 0; | |
3160 | ||
3161 | /* Do not count the primary source file in the include level. */ | |
3162 | ip = CPP_PREV_BUFFER (CPP_BUFFER (pfile)); | |
3163 | while (ip) | |
3164 | { | |
3165 | true_indepth++; | |
3166 | ip = CPP_PREV_BUFFER (ip); | |
3167 | } | |
3168 | result = alloc_number_token (pfile, true_indepth); | |
3fef5b2b NB |
3169 | } |
3170 | break; | |
3171 | ||
041c3194 ZW |
3172 | case T_SPECLINE: |
3173 | /* If __LINE__ is embedded in a macro, it must expand to the | |
3174 | line of the macro's invocation, not its definition. | |
3175 | Otherwise things like assert() will not work properly. */ | |
3176 | result = alloc_number_token (pfile, _cpp_get_line (pfile, NULL)); | |
5d7ee2fa NB |
3177 | break; |
3178 | ||
041c3194 | 3179 | case T_STDC: |
3fef5b2b | 3180 | { |
041c3194 | 3181 | int stdc = 1; |
3fef5b2b | 3182 | |
041c3194 ZW |
3183 | #ifdef STDC_0_IN_SYSTEM_HEADERS |
3184 | if (CPP_IN_SYSTEM_HEADER (pfile) | |
bfb9dc7f | 3185 | && pfile->spec_nodes->n__STRICT_ANSI__->type == T_VOID) |
041c3194 ZW |
3186 | stdc = 0; |
3187 | #endif | |
3188 | result = alloc_number_token (pfile, stdc); | |
3fef5b2b NB |
3189 | } |
3190 | break; | |
3191 | ||
041c3194 ZW |
3192 | case T_DATE: |
3193 | case T_TIME: | |
3194 | if (pfile->date == 0) | |
3195 | { | |
3196 | /* Allocate __DATE__ and __TIME__ from permanent storage, | |
3197 | and save them in pfile so we don't have to do this again. | |
3198 | We don't generate these strings at init time because | |
3199 | time() and localtime() are very slow on some systems. */ | |
3200 | time_t tt = time (NULL); | |
3201 | struct tm *tb = localtime (&tt); | |
3202 | ||
3203 | pfile->date = make_string_token | |
3204 | ((cpp_token *) xmalloc (sizeof (cpp_token)), DSC("Oct 11 1347")); | |
3205 | pfile->time = make_string_token | |
3206 | ((cpp_token *) xmalloc (sizeof (cpp_token)), DSC("12:34:56")); | |
3207 | ||
bfb9dc7f | 3208 | sprintf ((char *) pfile->date->val.str.text, "%s %2d %4d", |
041c3194 | 3209 | monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900); |
bfb9dc7f | 3210 | sprintf ((char *) pfile->time->val.str.text, "%02d:%02d:%02d", |
041c3194 ZW |
3211 | tb->tm_hour, tb->tm_min, tb->tm_sec); |
3212 | } | |
3213 | result = node->type == T_DATE ? pfile->date: pfile->time; | |
3fef5b2b NB |
3214 | break; |
3215 | ||
041c3194 | 3216 | case T_POISON: |
bfb9dc7f | 3217 | cpp_error (pfile, "attempt to use poisoned \"%s\"", node->name); |
041c3194 ZW |
3218 | return token; |
3219 | ||
3220 | default: | |
3221 | cpp_ice (pfile, "invalid special hash type"); | |
3222 | return token; | |
3fef5b2b NB |
3223 | } |
3224 | ||
041c3194 ZW |
3225 | ASSIGN_FLAGS_AND_POS (result, token); |
3226 | return result; | |
3227 | } | |
3228 | #undef DSC | |
3229 | ||
3230 | /* Dump the original user's spelling of argument index ARG_NO to the | |
3231 | macro whose expansion is LIST. */ | |
3232 | static void | |
3233 | dump_param_spelling (pfile, list, arg_no) | |
3234 | cpp_reader *pfile; | |
3235 | const cpp_toklist *list; | |
3236 | unsigned int arg_no; | |
3237 | { | |
3238 | const U_CHAR *param = list->namebuf; | |
3239 | ||
3240 | while (arg_no--) | |
3241 | param += ustrlen (param) + 1; | |
3242 | CPP_PUTS (pfile, param, ustrlen (param)); | |
3fef5b2b NB |
3243 | } |
3244 | ||
041c3194 | 3245 | /* Dump a token list to the output. */ |
c5a04734 | 3246 | void |
041c3194 ZW |
3247 | _cpp_dump_list (pfile, list, token, flush) |
3248 | cpp_reader *pfile; | |
3249 | const cpp_toklist *list; | |
3250 | const cpp_token *token; | |
3251 | int flush; | |
c5a04734 | 3252 | { |
041c3194 ZW |
3253 | const cpp_token *limit = list->tokens + list->tokens_used; |
3254 | const cpp_token *prev = 0; | |
c5a04734 | 3255 | |
041c3194 ZW |
3256 | /* Avoid the CPP_EOF. */ |
3257 | if (list->directive) | |
3258 | limit--; | |
c5a04734 | 3259 | |
041c3194 | 3260 | while (token < limit) |
c5a04734 | 3261 | { |
041c3194 ZW |
3262 | if (token->type == CPP_MACRO_ARG) |
3263 | { | |
3264 | if (token->flags & PREV_WHITE) | |
3265 | CPP_PUTC (pfile, ' '); | |
3266 | if (token->flags & STRINGIFY_ARG) | |
3267 | CPP_PUTC (pfile, '#'); | |
3268 | dump_param_spelling (pfile, list, token->val.aux); | |
3269 | } | |
c5a04734 | 3270 | else |
041c3194 ZW |
3271 | output_token (pfile, token, prev); |
3272 | if (token->flags & PASTE_LEFT) | |
3273 | CPP_PUTS (pfile, " ##", 3); | |
3274 | prev = token; | |
3275 | token++; | |
c5a04734 | 3276 | } |
041c3194 ZW |
3277 | |
3278 | if (flush && pfile->printer) | |
3279 | cpp_output_tokens (pfile, pfile->printer, pfile->token_list.line); | |
c5a04734 ZW |
3280 | } |
3281 | ||
041c3194 ZW |
3282 | /* Allocate pfile->input_buffer, and initialize trigraph_map[] |
3283 | if it hasn't happened already. */ | |
3284 | ||
3285 | void | |
3286 | _cpp_init_input_buffer (pfile) | |
3287 | cpp_reader *pfile; | |
3288 | { | |
3289 | init_trigraph_map (); | |
3290 | pfile->context_cap = 20; | |
3291 | pfile->contexts = (cpp_context *) | |
3292 | xmalloc (pfile->context_cap * sizeof (cpp_context)); | |
3293 | pfile->cur_context = 0; | |
3294 | pfile->contexts[0].u.list = &pfile->token_list; | |
3295 | ||
3296 | pfile->contexts[0].posn = 0; | |
3297 | pfile->contexts[0].count = 0; | |
3298 | pfile->no_expand_level = UINT_MAX; | |
3299 | ||
3300 | _cpp_init_toklist (&pfile->token_list, DUMMY_TOKEN); | |
3301 | } | |
3302 | ||
3303 | /* Moves to the end of the directive line, popping contexts as | |
3304 | necessary. */ | |
3305 | void | |
3306 | _cpp_skip_rest_of_line (pfile) | |
3307 | cpp_reader *pfile; | |
3308 | { | |
3309 | /* Get to base context. Clear parsing args and each contexts flags, | |
3310 | since these can cause pop_context to return without popping. */ | |
3311 | pfile->no_expand_level = UINT_MAX; | |
3312 | while (pfile->cur_context != 0) | |
c5a04734 | 3313 | { |
041c3194 ZW |
3314 | pfile->contexts[pfile->cur_context].flags = 0; |
3315 | do_pop_context (pfile); | |
c5a04734 | 3316 | } |
041c3194 ZW |
3317 | |
3318 | pfile->contexts[pfile->cur_context].count = 0; | |
3319 | pfile->contexts[pfile->cur_context].posn = 0; | |
3320 | pfile->token_list.directive = 0; | |
c5a04734 ZW |
3321 | } |
3322 | ||
041c3194 ZW |
3323 | /* Directive handler wrapper used by the command line option |
3324 | processor. */ | |
3325 | void | |
3326 | _cpp_run_directive (pfile, dir, buf, count) | |
3327 | cpp_reader *pfile; | |
3328 | const struct directive *dir; | |
3329 | const char *buf; | |
3330 | size_t count; | |
3331 | { | |
3332 | if (cpp_push_buffer (pfile, (const U_CHAR *)buf, count) != NULL) | |
3333 | { | |
3334 | unsigned int prev_lvl = 0; | |
3335 | /* scan the line now, else prevent_macro_expansion won't work */ | |
3336 | do_pop_context (pfile); | |
3337 | if (! (dir->flags & EXPAND)) | |
3338 | prev_lvl = prevent_macro_expansion (pfile); | |
3339 | ||
3340 | (void) (*dir->handler) (pfile); | |
3341 | ||
3342 | if (! (dir->flags & EXPAND)) | |
3343 | restore_macro_expansion (pfile, prev_lvl); | |
3344 | ||
3345 | _cpp_skip_rest_of_line (pfile); | |
3346 | cpp_pop_buffer (pfile); | |
3347 | } | |
3348 | } |