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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 | 27 | o Check line numbers assigned to all errors. |
041c3194 | 28 | o lex_line's use of cur_token, flags and list->token_used is a bit opaque. |
041c3194 ZW |
29 | o Distinguish integers, floats, and 'other' pp-numbers. |
30 | o Store ints and char constants as binary values. | |
31 | o New command-line assertion syntax. | |
041c3194 ZW |
32 | o Work towards functions in cpperror.c taking a message level parameter. |
33 | If we do this, merge the common code of do_warning and do_error. | |
34 | o Comment all functions, and describe macro expansion algorithm. | |
35 | o Move as much out of header files as possible. | |
36 | o Remove single quote pairs `', and some '', from diagnostics. | |
37 | o Correct pastability test for CPP_NAME and CPP_NUMBER. | |
38 | ||
39 | */ | |
40 | ||
45b966db ZW |
41 | #include "config.h" |
42 | #include "system.h" | |
43 | #include "intl.h" | |
44 | #include "cpplib.h" | |
45 | #include "cpphash.h" | |
041c3194 | 46 | #include "symcat.h" |
45b966db | 47 | |
f9a0e96c ZW |
48 | static const cpp_token placemarker_token = {0, 0, CPP_PLACEMARKER, 0 UNION_INIT_ZERO}; |
49 | static const cpp_token eof_token = {0, 0, CPP_EOF, 0 UNION_INIT_ZERO}; | |
50 | ||
51 | /* Flags for cpp_context. */ | |
52 | #define CONTEXT_PASTEL (1 << 0) /* An argument context on LHS of ##. */ | |
53 | #define CONTEXT_PASTER (1 << 1) /* An argument context on RHS of ##. */ | |
54 | #define CONTEXT_RAW (1 << 2) /* If argument tokens already expanded. */ | |
55 | #define CONTEXT_ARG (1 << 3) /* If an argument context. */ | |
56 | ||
57 | typedef struct cpp_context cpp_context; | |
58 | struct cpp_context | |
59 | { | |
60 | union | |
61 | { | |
62 | const cpp_toklist *list; /* Used for macro contexts only. */ | |
63 | const cpp_token **arg; /* Used for arg contexts only. */ | |
64 | } u; | |
65 | ||
66 | /* Pushed token to be returned by next call to get_raw_token. */ | |
67 | const cpp_token *pushed_token; | |
68 | ||
f67798e7 NB |
69 | struct macro_args *args; /* The arguments for a function-like |
70 | macro. NULL otherwise. */ | |
f9a0e96c ZW |
71 | unsigned short posn; /* Current posn, index into u. */ |
72 | unsigned short count; /* No. of tokens in u. */ | |
73 | unsigned short level; | |
74 | unsigned char flags; | |
75 | }; | |
76 | ||
77 | typedef struct macro_args macro_args; | |
78 | struct macro_args | |
79 | { | |
80 | unsigned int *ends; | |
81 | const cpp_token **tokens; | |
82 | unsigned int capacity; | |
83 | unsigned int used; | |
84 | unsigned short level; | |
85 | }; | |
86 | ||
87 | static const cpp_token *get_raw_token PARAMS ((cpp_reader *)); | |
88 | static const cpp_token *parse_arg PARAMS ((cpp_reader *, int, unsigned int, | |
89 | macro_args *, unsigned int *)); | |
90 | static int parse_args PARAMS ((cpp_reader *, cpp_hashnode *, macro_args *)); | |
91 | static void save_token PARAMS ((macro_args *, const cpp_token *)); | |
92 | static int pop_context PARAMS ((cpp_reader *)); | |
93 | static int push_macro_context PARAMS ((cpp_reader *, const cpp_token *)); | |
94 | static void push_arg_context PARAMS ((cpp_reader *, const cpp_token *)); | |
95 | static void free_macro_args PARAMS ((macro_args *)); | |
96 | ||
041c3194 ZW |
97 | #define auto_expand_name_space(list) \ |
98 | _cpp_expand_name_space ((list), 1 + (list)->name_cap / 2) | |
58fea6af | 99 | static void dump_param_spelling PARAMS ((FILE *, const cpp_toklist *, |
1368ee70 | 100 | unsigned int)); |
041c3194 | 101 | static void output_line_command PARAMS ((cpp_reader *, cpp_printer *, |
9e62c811 | 102 | unsigned int)); |
f2d5f0cc | 103 | |
041c3194 ZW |
104 | static void process_directive PARAMS ((cpp_reader *, const cpp_token *)); |
105 | static unsigned char *trigraph_replace PARAMS ((cpp_reader *, unsigned char *, | |
b8f41010 NB |
106 | unsigned char *)); |
107 | static const unsigned char *backslash_start PARAMS ((cpp_reader *, | |
108 | const unsigned char *)); | |
041c3194 ZW |
109 | static int skip_block_comment PARAMS ((cpp_reader *)); |
110 | static int skip_line_comment PARAMS ((cpp_reader *)); | |
52fadca8 | 111 | static void adjust_column PARAMS ((cpp_reader *, const U_CHAR *)); |
b8f41010 | 112 | static void skip_whitespace PARAMS ((cpp_reader *, int)); |
bfb9dc7f ZW |
113 | static const U_CHAR *parse_name PARAMS ((cpp_reader *, cpp_token *, |
114 | const U_CHAR *, const U_CHAR *)); | |
115 | static void parse_number PARAMS ((cpp_reader *, cpp_toklist *, cpp_string *)); | |
041c3194 ZW |
116 | static void parse_string PARAMS ((cpp_reader *, cpp_toklist *, cpp_token *, |
117 | unsigned int)); | |
b8f41010 | 118 | static int trigraph_ok PARAMS ((cpp_reader *, const unsigned char *)); |
f624ffa7 NB |
119 | static void save_comment PARAMS ((cpp_toklist *, cpp_token *, |
120 | const unsigned char *, | |
ad265aa4 | 121 | unsigned int, unsigned int)); |
041c3194 ZW |
122 | static void lex_line PARAMS ((cpp_reader *, cpp_toklist *)); |
123 | static int lex_next PARAMS ((cpp_reader *, int)); | |
124 | static int is_macro_disabled PARAMS ((cpp_reader *, const cpp_toklist *, | |
125 | const cpp_token *)); | |
b8f41010 | 126 | |
041c3194 ZW |
127 | static cpp_token *stringify_arg PARAMS ((cpp_reader *, const cpp_token *)); |
128 | static void expand_context_stack PARAMS ((cpp_reader *)); | |
d1d9a6bd | 129 | static unsigned char * spell_token PARAMS ((cpp_reader *, const cpp_token *, |
041c3194 | 130 | unsigned char *)); |
58fea6af ZW |
131 | static void output_token PARAMS ((cpp_reader *, FILE *, const cpp_token *, |
132 | const cpp_token *, int)); | |
b8f41010 NB |
133 | typedef unsigned int (* speller) PARAMS ((unsigned char *, cpp_toklist *, |
134 | cpp_token *)); | |
041c3194 ZW |
135 | static cpp_token *make_string_token PARAMS ((cpp_token *, const U_CHAR *, |
136 | unsigned int)); | |
137 | static cpp_token *alloc_number_token PARAMS ((cpp_reader *, int number)); | |
138 | static const cpp_token *special_symbol PARAMS ((cpp_reader *, cpp_hashnode *, | |
139 | const cpp_token *)); | |
140 | static cpp_token *duplicate_token PARAMS ((cpp_reader *, const cpp_token *)); | |
141 | static const cpp_token *maybe_paste_with_next PARAMS ((cpp_reader *, | |
142 | const cpp_token *)); | |
143 | static enum cpp_ttype can_paste PARAMS ((cpp_reader *, const cpp_token *, | |
144 | const cpp_token *, int *)); | |
145 | static unsigned int prevent_macro_expansion PARAMS ((cpp_reader *)); | |
146 | static void restore_macro_expansion PARAMS ((cpp_reader *, unsigned int)); | |
147 | static cpp_token *get_temp_token PARAMS ((cpp_reader *)); | |
148 | static void release_temp_tokens PARAMS ((cpp_reader *)); | |
149 | static U_CHAR * quote_string PARAMS ((U_CHAR *, const U_CHAR *, unsigned int)); | |
150 | static void process_directive PARAMS ((cpp_reader *, const cpp_token *)); | |
b8f41010 | 151 | |
bfb9dc7f ZW |
152 | #define INIT_TOKEN_STR(list, token) \ |
153 | do {(token)->val.str.len = 0; \ | |
154 | (token)->val.str.text = (list)->namebuf + (list)->name_used; \ | |
d1d9a6bd | 155 | } while (0) |
b8f41010 | 156 | |
041c3194 ZW |
157 | #define VALID_SIGN(c, prevc) \ |
158 | (((c) == '+' || (c) == '-') && \ | |
159 | ((prevc) == 'e' || (prevc) == 'E' \ | |
160 | || (((prevc) == 'p' || (prevc) == 'P') && !CPP_OPTION (pfile, c89)))) | |
161 | ||
b8f41010 NB |
162 | /* Handle LF, CR, CR-LF and LF-CR style newlines. Assumes next |
163 | character, if any, is in buffer. */ | |
041c3194 | 164 | |
b8f41010 | 165 | #define handle_newline(cur, limit, c) \ |
041c3194 | 166 | do { \ |
b8f41010 NB |
167 | if ((cur) < (limit) && *(cur) == '\r' + '\n' - c) \ |
168 | (cur)++; \ | |
041c3194 ZW |
169 | pfile->buffer->lineno++; \ |
170 | pfile->buffer->line_base = (cur); \ | |
6ab3e7dd | 171 | pfile->col_adjust = 0; \ |
041c3194 | 172 | } while (0) |
b8f41010 | 173 | |
041c3194 | 174 | #define IMMED_TOKEN() (!(cur_token->flags & PREV_WHITE)) |
b8f41010 NB |
175 | #define PREV_TOKEN_TYPE (cur_token[-1].type) |
176 | ||
f9a0e96c ZW |
177 | #define PUSH_TOKEN(ttype) cur_token++->type = (ttype) |
178 | #define REVISE_TOKEN(ttype) cur_token[-1].type = (ttype) | |
179 | #define BACKUP_TOKEN(ttype) (--cur_token)->type = (ttype) | |
f617b8e2 NB |
180 | #define BACKUP_DIGRAPH(ttype) do { \ |
181 | BACKUP_TOKEN(ttype); cur_token->flags |= DIGRAPH;} while (0) | |
182 | ||
183 | /* An upper bound on the number of bytes needed to spell a token, | |
184 | including preceding whitespace. */ | |
58fea6af ZW |
185 | static inline size_t TOKEN_LEN PARAMS ((const cpp_token *)); |
186 | static inline size_t | |
187 | TOKEN_LEN (token) | |
188 | const cpp_token *token; | |
189 | { | |
190 | size_t len; | |
191 | ||
192 | switch (TOKEN_SPELL (token)) | |
193 | { | |
194 | default: len = 0; break; | |
195 | case SPELL_STRING: len = token->val.str.len; break; | |
196 | case SPELL_IDENT: len = token->val.node->length; break; | |
197 | } | |
198 | return len + 5; | |
199 | } | |
f617b8e2 | 200 | |
f9a0e96c ZW |
201 | #define IS_ARG_CONTEXT(c) ((c)->flags & CONTEXT_ARG) |
202 | #define CURRENT_CONTEXT(pfile) ((pfile)->contexts + (pfile)->cur_context) | |
5ef865d5 ZW |
203 | #define ON_REST_ARG(c) \ |
204 | (((c)->flags & VAR_ARGS) \ | |
205 | && (c)->u.list->tokens[(c)->posn].val.aux \ | |
206 | == (unsigned int) ((c)->u.list->paramc - 1)) | |
f9a0e96c ZW |
207 | |
208 | #define ASSIGN_FLAGS_AND_POS(d, s) \ | |
209 | do {(d)->flags = (s)->flags & (PREV_WHITE | BOL | PASTE_LEFT); \ | |
210 | if ((d)->flags & BOL) {(d)->col = (s)->col; (d)->line = (s)->line;} \ | |
211 | } while (0) | |
212 | ||
213 | /* f is flags, just consisting of PREV_WHITE | BOL. */ | |
214 | #define MODIFY_FLAGS_AND_POS(d, s, f) \ | |
215 | do {(d)->flags &= ~(PREV_WHITE | BOL); (d)->flags |= (f); \ | |
216 | if ((f) & BOL) {(d)->col = (s)->col; (d)->line = (s)->line;} \ | |
217 | } while (0) | |
218 | ||
96be6998 ZW |
219 | #define OP(e, s) { SPELL_OPERATOR, U s }, |
220 | #define TK(e, s) { s, U STRINGX (e) }, | |
b8f41010 | 221 | |
041c3194 | 222 | const struct token_spelling |
96be6998 | 223 | _cpp_token_spellings [N_TTYPES] = {TTYPE_TABLE }; |
041c3194 | 224 | |
96be6998 ZW |
225 | #undef OP |
226 | #undef TK | |
b8f41010 | 227 | |
f2d5f0cc ZW |
228 | /* Notify the compiler proper that the current line number has jumped, |
229 | or the current file name has changed. */ | |
230 | ||
231 | static void | |
1368ee70 | 232 | output_line_command (pfile, print, line) |
45b966db | 233 | cpp_reader *pfile; |
f2d5f0cc | 234 | cpp_printer *print; |
1368ee70 | 235 | unsigned int line; |
45b966db | 236 | { |
041c3194 | 237 | cpp_buffer *ip = CPP_BUFFER (pfile); |
f2d5f0cc | 238 | |
041c3194 ZW |
239 | if (line == 0) |
240 | return; | |
241 | ||
242 | /* End the previous line of text. */ | |
243 | if (pfile->need_newline) | |
58fea6af ZW |
244 | { |
245 | putc ('\n', print->outf); | |
246 | print->lineno++; | |
247 | } | |
041c3194 ZW |
248 | pfile->need_newline = 0; |
249 | ||
f2d5f0cc ZW |
250 | if (CPP_OPTION (pfile, no_line_commands)) |
251 | return; | |
252 | ||
f2d5f0cc ZW |
253 | /* If the current file has not changed, we can output a few newlines |
254 | instead if we want to increase the line number by a small amount. | |
255 | We cannot do this if print->lineno is zero, because that means we | |
256 | haven't output any line commands yet. (The very first line | |
58fea6af ZW |
257 | command output is a `same_file' command.) |
258 | ||
259 | 'nominal_fname' values are unique, so they can be compared by | |
260 | comparing pointers. */ | |
261 | if (ip->nominal_fname == print->last_fname && print->lineno > 0 | |
f2d5f0cc | 262 | && line >= print->lineno && line < print->lineno + 8) |
45b966db | 263 | { |
f2d5f0cc | 264 | while (line > print->lineno) |
45b966db | 265 | { |
f2d5f0cc ZW |
266 | putc ('\n', print->outf); |
267 | print->lineno++; | |
45b966db | 268 | } |
f2d5f0cc | 269 | return; |
45b966db | 270 | } |
f2d5f0cc | 271 | |
58fea6af ZW |
272 | fprintf (print->outf, "# %u \"%s\"%s\n", line, ip->nominal_fname, |
273 | cpp_syshdr_flags (pfile, ip)); | |
274 | ||
275 | print->last_fname = ip->nominal_fname; | |
f2d5f0cc ZW |
276 | print->lineno = line; |
277 | } | |
278 | ||
58fea6af ZW |
279 | /* Like fprintf, but writes to a printer object. You should be sure |
280 | always to generate a complete line when you use this function. */ | |
f2d5f0cc | 281 | void |
58fea6af ZW |
282 | cpp_printf VPARAMS ((cpp_reader *pfile, cpp_printer *print, |
283 | const char *fmt, ...)) | |
284 | { | |
285 | va_list ap; | |
286 | #ifndef ANSI_PROTOTYPES | |
287 | cpp_reader *pfile; | |
288 | cpp_printer *print; | |
289 | const char *fmt; | |
290 | #endif | |
45b966db | 291 | |
58fea6af ZW |
292 | VA_START (ap, fmt); |
293 | ||
294 | #ifndef ANSI_PROTOTYPES | |
295 | pfile = va_arg (ap, cpp_reader *); | |
296 | print = va_arg (ap, cpp_printer *); | |
297 | fmt = va_arg (ap, const char *); | |
298 | #endif | |
299 | ||
300 | /* End the previous line of text. */ | |
301 | if (pfile->need_newline) | |
3cb553b4 ZW |
302 | { |
303 | putc ('\n', print->outf); | |
304 | print->lineno++; | |
305 | } | |
58fea6af ZW |
306 | pfile->need_newline = 0; |
307 | ||
308 | vfprintf (print->outf, fmt, ap); | |
309 | va_end (ap); | |
45b966db ZW |
310 | } |
311 | ||
c56c2073 | 312 | /* Scan until CPP_BUFFER (PFILE) is exhausted, discarding output. */ |
f2d5f0cc ZW |
313 | |
314 | void | |
315 | cpp_scan_buffer_nooutput (pfile) | |
316 | cpp_reader *pfile; | |
317 | { | |
041c3194 | 318 | cpp_buffer *stop = CPP_PREV_BUFFER (CPP_BUFFER (pfile)); |
2c0accc9 | 319 | const cpp_token *token; |
041c3194 | 320 | |
2c0accc9 | 321 | /* In no-output mode, we can ignore everything but directives. */ |
f2d5f0cc ZW |
322 | for (;;) |
323 | { | |
2c0accc9 ZW |
324 | token = _cpp_get_token (pfile); |
325 | ||
041c3194 ZW |
326 | if (token->type == CPP_EOF) |
327 | { | |
328 | cpp_pop_buffer (pfile); | |
329 | if (CPP_BUFFER (pfile) == stop) | |
330 | break; | |
331 | } | |
2c0accc9 ZW |
332 | |
333 | if (token->type == CPP_HASH && token->flags & BOL | |
334 | && pfile->token_list.directive) | |
335 | { | |
336 | process_directive (pfile, token); | |
337 | continue; | |
338 | } | |
339 | ||
041c3194 | 340 | _cpp_skip_rest_of_line (pfile); |
f2d5f0cc | 341 | } |
f2d5f0cc ZW |
342 | } |
343 | ||
c56c2073 | 344 | /* Scan until CPP_BUFFER (pfile) is exhausted, writing output to PRINT. */ |
f2d5f0cc ZW |
345 | void |
346 | cpp_scan_buffer (pfile, print) | |
347 | cpp_reader *pfile; | |
348 | cpp_printer *print; | |
349 | { | |
c56c2073 | 350 | cpp_buffer *stop = CPP_PREV_BUFFER (CPP_BUFFER (pfile)); |
041c3194 | 351 | const cpp_token *token, *prev = 0; |
f2d5f0cc ZW |
352 | |
353 | for (;;) | |
354 | { | |
2c0accc9 | 355 | token = _cpp_get_token (pfile); |
041c3194 | 356 | if (token->type == CPP_EOF) |
f2d5f0cc | 357 | { |
041c3194 | 358 | cpp_pop_buffer (pfile); |
d0089985 | 359 | |
041c3194 | 360 | if (CPP_BUFFER (pfile) == stop) |
f2d5f0cc | 361 | return; |
2c0accc9 | 362 | |
041c3194 ZW |
363 | prev = 0; |
364 | continue; | |
365 | } | |
366 | ||
367 | if (token->flags & BOL) | |
368 | { | |
3cb553b4 ZW |
369 | output_line_command (pfile, print, pfile->token_list.line); |
370 | prev = 0; | |
371 | ||
2c0accc9 ZW |
372 | if (token->type == CPP_HASH && pfile->token_list.directive) |
373 | { | |
374 | process_directive (pfile, token); | |
375 | continue; | |
376 | } | |
f2d5f0cc | 377 | } |
041c3194 | 378 | |
2c0accc9 | 379 | if (token->type != CPP_PLACEMARKER) |
f9a0e96c | 380 | { |
58fea6af ZW |
381 | output_token (pfile, print->outf, token, prev, 1); |
382 | pfile->need_newline = 1; | |
f9a0e96c ZW |
383 | } |
384 | ||
f9a0e96c ZW |
385 | prev = token; |
386 | } | |
f9a0e96c ZW |
387 | } |
388 | ||
041c3194 ZW |
389 | /* Helper routine used by parse_include, which can't see spell_token. |
390 | Reinterpret the current line as an h-char-sequence (< ... >); we are | |
391 | looking at the first token after the <. */ | |
392 | const cpp_token * | |
393 | _cpp_glue_header_name (pfile) | |
45b966db ZW |
394 | cpp_reader *pfile; |
395 | { | |
041c3194 ZW |
396 | const cpp_token *t; |
397 | cpp_token *hdr; | |
58fea6af ZW |
398 | U_CHAR *buf, *p; |
399 | size_t len, avail; | |
400 | ||
401 | avail = 40; | |
402 | len = 0; | |
403 | buf = xmalloc (avail); | |
041c3194 ZW |
404 | |
405 | for (;;) | |
406 | { | |
417f3e3a | 407 | t = _cpp_get_token (pfile); |
041c3194 ZW |
408 | if (t->type == CPP_GREATER || t->type == CPP_EOF) |
409 | break; | |
410 | ||
58fea6af ZW |
411 | if (len + TOKEN_LEN (t) > avail) |
412 | { | |
413 | avail = len + TOKEN_LEN (t) + 40; | |
414 | buf = xrealloc (buf, avail); | |
415 | } | |
416 | ||
041c3194 | 417 | if (t->flags & PREV_WHITE) |
58fea6af ZW |
418 | buf[len++] = ' '; |
419 | ||
420 | p = spell_token (pfile, t, buf + len); | |
421 | len = (size_t) (p - buf); /* p known >= buf */ | |
041c3194 ZW |
422 | } |
423 | ||
424 | if (t->type == CPP_EOF) | |
425 | cpp_error (pfile, "missing terminating > character"); | |
45b966db | 426 | |
58fea6af | 427 | buf = xrealloc (buf, len); |
041c3194 ZW |
428 | |
429 | hdr = get_temp_token (pfile); | |
430 | hdr->type = CPP_HEADER_NAME; | |
431 | hdr->flags = 0; | |
bfb9dc7f ZW |
432 | hdr->val.str.text = buf; |
433 | hdr->val.str.len = len; | |
041c3194 | 434 | return hdr; |
45b966db ZW |
435 | } |
436 | ||
1368ee70 ZW |
437 | /* Token-buffer helper functions. */ |
438 | ||
d1d9a6bd NB |
439 | /* Expand a token list's string space. It is *vital* that |
440 | list->tokens_used is correct, to get pointer fix-up right. */ | |
041c3194 ZW |
441 | void |
442 | _cpp_expand_name_space (list, len) | |
1368ee70 | 443 | cpp_toklist *list; |
c5a04734 ZW |
444 | unsigned int len; |
445 | { | |
f617b8e2 | 446 | const U_CHAR *old_namebuf; |
f617b8e2 NB |
447 | |
448 | old_namebuf = list->namebuf; | |
c5a04734 ZW |
449 | list->name_cap += len; |
450 | list->namebuf = (unsigned char *) xrealloc (list->namebuf, list->name_cap); | |
f617b8e2 NB |
451 | |
452 | /* Fix up token text pointers. */ | |
79f50f2a | 453 | if (list->namebuf != old_namebuf) |
f617b8e2 NB |
454 | { |
455 | unsigned int i; | |
456 | ||
457 | for (i = 0; i < list->tokens_used; i++) | |
96be6998 | 458 | if (TOKEN_SPELL (&list->tokens[i]) == SPELL_STRING) |
bfb9dc7f | 459 | list->tokens[i].val.str.text += (list->namebuf - old_namebuf); |
f617b8e2 | 460 | } |
1368ee70 ZW |
461 | } |
462 | ||
041c3194 ZW |
463 | /* If there is not enough room for LEN more characters, expand the |
464 | list by just enough to have room for LEN characters. */ | |
465 | void | |
466 | _cpp_reserve_name_space (list, len) | |
467 | cpp_toklist *list; | |
468 | unsigned int len; | |
469 | { | |
470 | unsigned int room = list->name_cap - list->name_used; | |
471 | ||
472 | if (room < len) | |
473 | _cpp_expand_name_space (list, len - room); | |
474 | } | |
475 | ||
1368ee70 | 476 | /* Expand the number of tokens in a list. */ |
d1d9a6bd NB |
477 | void |
478 | _cpp_expand_token_space (list, count) | |
1368ee70 | 479 | cpp_toklist *list; |
d1d9a6bd | 480 | unsigned int count; |
1368ee70 | 481 | { |
d1d9a6bd NB |
482 | unsigned int n; |
483 | ||
484 | list->tokens_cap += count; | |
485 | n = list->tokens_cap; | |
15dad1d9 | 486 | if (list->flags & LIST_OFFSET) |
d1d9a6bd | 487 | list->tokens--, n++; |
1368ee70 | 488 | list->tokens = (cpp_token *) |
d1d9a6bd | 489 | xrealloc (list->tokens, n * sizeof (cpp_token)); |
15dad1d9 ZW |
490 | if (list->flags & LIST_OFFSET) |
491 | list->tokens++; /* Skip the dummy. */ | |
1368ee70 ZW |
492 | } |
493 | ||
d1d9a6bd NB |
494 | /* Initialize a token list. If flags is DUMMY_TOKEN, we allocate |
495 | an extra token in front of the token list, as this allows the lexer | |
496 | to always peek at the previous token without worrying about | |
497 | underflowing the list, and some initial space. Otherwise, no | |
498 | token- or name-space is allocated, and there is no dummy token. */ | |
15dad1d9 | 499 | void |
d1d9a6bd | 500 | _cpp_init_toklist (list, flags) |
1368ee70 | 501 | cpp_toklist *list; |
d1d9a6bd | 502 | int flags; |
1368ee70 | 503 | { |
d1d9a6bd NB |
504 | if (flags == NO_DUMMY_TOKEN) |
505 | { | |
506 | list->tokens_cap = 0; | |
041c3194 | 507 | list->tokens = 0; |
d1d9a6bd | 508 | list->name_cap = 0; |
041c3194 | 509 | list->namebuf = 0; |
d1d9a6bd NB |
510 | list->flags = 0; |
511 | } | |
512 | else | |
513 | { | |
514 | /* Initialize token space. Put a dummy token before the start | |
515 | that will fail matches. */ | |
516 | list->tokens_cap = 256; /* 4K's worth. */ | |
517 | list->tokens = (cpp_token *) | |
518 | xmalloc ((list->tokens_cap + 1) * sizeof (cpp_token)); | |
519 | list->tokens[0].type = CPP_EOF; | |
520 | list->tokens++; | |
521 | ||
522 | /* Initialize name space. */ | |
523 | list->name_cap = 1024; | |
041c3194 | 524 | list->namebuf = (unsigned char *) xmalloc (list->name_cap); |
d1d9a6bd NB |
525 | list->flags = LIST_OFFSET; |
526 | } | |
15dad1d9 | 527 | |
15dad1d9 ZW |
528 | _cpp_clear_toklist (list); |
529 | } | |
1368ee70 | 530 | |
15dad1d9 ZW |
531 | /* Clear a token list. */ |
532 | void | |
533 | _cpp_clear_toklist (list) | |
534 | cpp_toklist *list; | |
535 | { | |
c5a04734 ZW |
536 | list->tokens_used = 0; |
537 | list->name_used = 0; | |
041c3194 ZW |
538 | list->directive = 0; |
539 | list->paramc = 0; | |
540 | list->params_len = 0; | |
15dad1d9 ZW |
541 | list->flags &= LIST_OFFSET; /* clear all but that one */ |
542 | } | |
543 | ||
544 | /* Free a token list. Does not free the list itself, which may be | |
545 | embedded in a larger structure. */ | |
546 | void | |
547 | _cpp_free_toklist (list) | |
041c3194 | 548 | const cpp_toklist *list; |
15dad1d9 | 549 | { |
15dad1d9 ZW |
550 | if (list->flags & LIST_OFFSET) |
551 | free (list->tokens - 1); /* Backup over dummy token. */ | |
552 | else | |
553 | free (list->tokens); | |
554 | free (list->namebuf); | |
1368ee70 ZW |
555 | } |
556 | ||
15dad1d9 ZW |
557 | /* Compare two tokens. */ |
558 | int | |
559 | _cpp_equiv_tokens (a, b) | |
560 | const cpp_token *a, *b; | |
561 | { | |
041c3194 | 562 | if (a->type == b->type && a->flags == b->flags) |
96be6998 | 563 | switch (TOKEN_SPELL (a)) |
041c3194 ZW |
564 | { |
565 | default: /* Keep compiler happy. */ | |
566 | case SPELL_OPERATOR: | |
567 | return 1; | |
568 | case SPELL_CHAR: | |
569 | case SPELL_NONE: | |
570 | return a->val.aux == b->val.aux; /* arg_no or character. */ | |
571 | case SPELL_IDENT: | |
bfb9dc7f | 572 | return a->val.node == b->val.node; |
041c3194 | 573 | case SPELL_STRING: |
bfb9dc7f ZW |
574 | return (a->val.str.len == b->val.str.len |
575 | && !memcmp (a->val.str.text, b->val.str.text, | |
576 | a->val.str.len)); | |
041c3194 | 577 | } |
15dad1d9 | 578 | |
041c3194 | 579 | return 0; |
15dad1d9 ZW |
580 | } |
581 | ||
582 | /* Compare two token lists. */ | |
583 | int | |
584 | _cpp_equiv_toklists (a, b) | |
585 | const cpp_toklist *a, *b; | |
586 | { | |
587 | unsigned int i; | |
588 | ||
041c3194 ZW |
589 | if (a->tokens_used != b->tokens_used |
590 | || a->flags != b->flags | |
591 | || a->paramc != b->paramc) | |
15dad1d9 ZW |
592 | return 0; |
593 | ||
594 | for (i = 0; i < a->tokens_used; i++) | |
595 | if (! _cpp_equiv_tokens (&a->tokens[i], &b->tokens[i])) | |
596 | return 0; | |
597 | return 1; | |
598 | } | |
599 | ||
041c3194 | 600 | /* Utility routine: |
9e62c811 | 601 | |
bfb9dc7f ZW |
602 | Compares, the token TOKEN to the NUL-terminated string STRING. |
603 | TOKEN must be a CPP_NAME. Returns 1 for equal, 0 for unequal. */ | |
15dad1d9 | 604 | |
041c3194 | 605 | int |
bfb9dc7f ZW |
606 | cpp_ideq (token, string) |
607 | const cpp_token *token; | |
041c3194 ZW |
608 | const char *string; |
609 | { | |
bfb9dc7f | 610 | if (token->type != CPP_NAME) |
041c3194 | 611 | return 0; |
bfb9dc7f ZW |
612 | |
613 | return !ustrcmp (token->val.node->name, (const U_CHAR *)string); | |
15dad1d9 | 614 | } |
1368ee70 | 615 | |
041c3194 | 616 | /* Lexing algorithm. |
45b966db | 617 | |
041c3194 ZW |
618 | The original lexer in cpplib was made up of two passes: a first pass |
619 | that replaced trigraphs and deleted esacped newlines, and a second | |
620 | pass that tokenized the result of the first pass. Tokenisation was | |
621 | performed by peeking at the next character in the input stream. For | |
622 | example, if the input stream contained "!=", the handler for the ! | |
623 | character would peek at the next character, and if it were a '=' | |
624 | would skip over it, and return a "!=" token, otherwise it would | |
625 | return just the "!" token. | |
61474454 | 626 | |
041c3194 ZW |
627 | To implement a single-pass lexer, this peeking ahead is unworkable. |
628 | An arbitrary number of escaped newlines, and trigraphs (in particular | |
629 | ??/ which translates to the escape \), could separate the '!' and '=' | |
630 | in the input stream, yet the next token is still a "!=". | |
61474454 | 631 | |
041c3194 ZW |
632 | Suppose instead that we lex by one logical line at a time, producing |
633 | a token list or stack for each logical line, and when seeing the '!' | |
634 | push a CPP_NOT token on the list. Then if the '!' is part of a | |
635 | longer token ("!=") we know we must see the remainder of the token by | |
636 | the time we reach the end of the logical line. Thus we can have the | |
637 | '=' handler look at the previous token (at the end of the list / top | |
638 | of the stack) and see if it is a "!" token, and if so, instead of | |
639 | pushing a "=" token revise the existing token to be a "!=" token. | |
61474454 | 640 | |
041c3194 ZW |
641 | This works in the presence of escaped newlines, because the '\' would |
642 | have been pushed on the top of the stack as a CPP_BACKSLASH. The | |
643 | newline ('\n' or '\r') handler looks at the token at the top of the | |
644 | stack to see if it is a CPP_BACKSLASH, and if so discards both. | |
f67798e7 | 645 | Hence the '=' handler would never see any intervening tokens. |
45b966db | 646 | |
041c3194 ZW |
647 | To make trigraphs work in this context, as in precedence trigraphs |
648 | are highest and converted before anything else, the '?' handler does | |
649 | lookahead to see if it is a trigraph, and if so skips the trigraph | |
650 | and pushes the token it represents onto the top of the stack. This | |
651 | also works in the particular case of a CPP_BACKSLASH trigraph. | |
45b966db | 652 | |
041c3194 ZW |
653 | To the preprocessor, whitespace is only significant to the point of |
654 | knowing whether whitespace precedes a particular token. For example, | |
655 | the '=' handler needs to know whether there was whitespace between it | |
656 | and a "!" token on the top of the stack, to make the token conversion | |
657 | decision correctly. So each token has a PREV_WHITE flag to | |
658 | indicate this - the standard permits consecutive whitespace to be | |
659 | regarded as a single space. The compiler front ends are not | |
660 | interested in whitespace at all; they just require a token stream. | |
661 | Another place where whitespace is significant to the preprocessor is | |
662 | a #define statment - if there is whitespace between the macro name | |
663 | and an initial "(" token the macro is "object-like", otherwise it is | |
664 | a function-like macro that takes arguments. | |
665 | ||
666 | However, all is not rosy. Parsing of identifiers, numbers, comments | |
667 | and strings becomes trickier because of the possibility of raw | |
668 | trigraphs and escaped newlines in the input stream. | |
669 | ||
670 | The trigraphs are three consecutive characters beginning with two | |
671 | question marks. A question mark is not valid as part of a number or | |
672 | identifier, so parsing of a number or identifier terminates normally | |
673 | upon reaching it, returning to the mainloop which handles the | |
674 | trigraph just like it would in any other position. Similarly for the | |
675 | backslash of a backslash-newline combination. So we just need the | |
676 | escaped-newline dropper in the mainloop to check if the token on the | |
677 | top of the stack after dropping the escaped newline is a number or | |
678 | identifier, and if so to continue the processing it as if nothing had | |
679 | happened. | |
680 | ||
681 | For strings, we replace trigraphs whenever we reach a quote or | |
682 | newline, because there might be a backslash trigraph escaping them. | |
683 | We need to be careful that we start trigraph replacing from where we | |
684 | left off previously, because it is possible for a first scan to leave | |
685 | "fake" trigraphs that a second scan would pick up as real (e.g. the | |
686 | sequence "????/\n=" would find a fake ??= trigraph after removing the | |
687 | escaped newline.) | |
688 | ||
689 | For line comments, on reaching a newline we scan the previous | |
690 | character(s) to see if it escaped, and continue if it is. Block | |
691 | comments ignore everything and just focus on finding the comment | |
692 | termination mark. The only difficult thing, and it is surprisingly | |
693 | tricky, is checking if an asterisk precedes the final slash since | |
694 | they could be separated by escaped newlines. If the preprocessor is | |
695 | invoked with the output comments option, we don't bother removing | |
696 | escaped newlines and replacing trigraphs for output. | |
697 | ||
698 | Finally, numbers can begin with a period, which is pushed initially | |
699 | as a CPP_DOT token in its own right. The digit handler checks if the | |
700 | previous token was a CPP_DOT not separated by whitespace, and if so | |
701 | pops it off the stack and pushes a period into the number's buffer | |
702 | before calling the number parser. | |
45b966db | 703 | |
041c3194 ZW |
704 | */ |
705 | ||
706 | static const unsigned char *digraph_spellings [] = {U"%:", U"%:%:", U"<:", | |
707 | U":>", U"<%", U"%>"}; | |
45b966db | 708 | |
041c3194 ZW |
709 | /* Call when a trigraph is encountered. It warns if necessary, and |
710 | returns true if the trigraph should be honoured. END is the third | |
711 | character of a trigraph in the input stream. */ | |
45b966db | 712 | static int |
041c3194 | 713 | trigraph_ok (pfile, end) |
45b966db | 714 | cpp_reader *pfile; |
041c3194 | 715 | const unsigned char *end; |
45b966db | 716 | { |
041c3194 ZW |
717 | int accept = CPP_OPTION (pfile, trigraphs); |
718 | ||
719 | if (CPP_OPTION (pfile, warn_trigraphs)) | |
45b966db | 720 | { |
041c3194 ZW |
721 | unsigned int col = end - 1 - pfile->buffer->line_base; |
722 | if (accept) | |
723 | cpp_warning_with_line (pfile, pfile->buffer->lineno, col, | |
724 | "trigraph ??%c converted to %c", | |
61d0346d | 725 | (int) *end, (int) _cpp_trigraph_map[*end]); |
45b966db | 726 | else |
041c3194 ZW |
727 | cpp_warning_with_line (pfile, pfile->buffer->lineno, col, |
728 | "trigraph ??%c ignored", (int) *end); | |
45b966db | 729 | } |
041c3194 | 730 | return accept; |
45b966db ZW |
731 | } |
732 | ||
041c3194 ZW |
733 | /* Scan a string for trigraphs, warning or replacing them inline as |
734 | appropriate. When parsing a string, we must call this routine | |
735 | before processing a newline character (if trigraphs are enabled), | |
736 | since the newline might be escaped by a preceding backslash | |
737 | trigraph sequence. Returns a pointer to the end of the name after | |
738 | replacement. */ | |
739 | ||
740 | static unsigned char * | |
741 | trigraph_replace (pfile, src, limit) | |
45b966db | 742 | cpp_reader *pfile; |
041c3194 ZW |
743 | unsigned char *src; |
744 | unsigned char *limit; | |
45b966db | 745 | { |
041c3194 ZW |
746 | unsigned char *dest; |
747 | ||
748 | /* Starting with src[1], find two consecutive '?'. The case of no | |
749 | trigraphs is streamlined. */ | |
750 | ||
043afb2a | 751 | for (src++; src + 1 < limit; src += 2) |
041c3194 ZW |
752 | { |
753 | if (src[0] != '?') | |
754 | continue; | |
755 | ||
756 | /* Make src point to the 1st (NOT 2nd) of two consecutive '?'s. */ | |
757 | if (src[-1] == '?') | |
758 | src--; | |
759 | else if (src + 2 == limit || src[1] != '?') | |
760 | continue; | |
45b966db | 761 | |
041c3194 | 762 | /* Check if it really is a trigraph. */ |
61d0346d | 763 | if (_cpp_trigraph_map[src[2]] == 0) |
041c3194 | 764 | continue; |
45b966db | 765 | |
041c3194 ZW |
766 | dest = src; |
767 | goto trigraph_found; | |
768 | } | |
769 | return limit; | |
45b966db | 770 | |
041c3194 ZW |
771 | /* Now we have a trigraph, we need to scan the remaining buffer, and |
772 | copy-shifting its contents left if replacement is enabled. */ | |
773 | for (; src + 2 < limit; dest++, src++) | |
61d0346d | 774 | if ((*dest = *src) == '?' && src[1] == '?' && _cpp_trigraph_map[src[2]]) |
041c3194 ZW |
775 | { |
776 | trigraph_found: | |
777 | src += 2; | |
778 | if (trigraph_ok (pfile, pfile->buffer->cur - (limit - src))) | |
61d0346d | 779 | *dest = _cpp_trigraph_map[*src]; |
041c3194 ZW |
780 | } |
781 | ||
782 | /* Copy remaining (at most 2) characters. */ | |
783 | while (src < limit) | |
784 | *dest++ = *src++; | |
785 | return dest; | |
45b966db ZW |
786 | } |
787 | ||
041c3194 ZW |
788 | /* If CUR is a backslash or the end of a trigraphed backslash, return |
789 | a pointer to its beginning, otherwise NULL. We don't read beyond | |
790 | the buffer start, because there is the start of the comment in the | |
791 | buffer. */ | |
792 | static const unsigned char * | |
793 | backslash_start (pfile, cur) | |
64aaf407 | 794 | cpp_reader *pfile; |
041c3194 | 795 | const unsigned char *cur; |
64aaf407 | 796 | { |
041c3194 ZW |
797 | if (cur[0] == '\\') |
798 | return cur; | |
799 | if (cur[0] == '/' && cur[-1] == '?' && cur[-2] == '?' | |
800 | && trigraph_ok (pfile, cur)) | |
801 | return cur - 2; | |
802 | return 0; | |
64aaf407 NB |
803 | } |
804 | ||
041c3194 ZW |
805 | /* Skip a C-style block comment. This is probably the trickiest |
806 | handler. We find the end of the comment by seeing if an asterisk | |
807 | is before every '/' we encounter. The nasty complication is that a | |
808 | previous asterisk may be separated by one or more escaped newlines. | |
809 | Returns non-zero if comment terminated by EOF, zero otherwise. */ | |
810 | static int | |
811 | skip_block_comment (pfile) | |
45b966db ZW |
812 | cpp_reader *pfile; |
813 | { | |
041c3194 ZW |
814 | cpp_buffer *buffer = pfile->buffer; |
815 | const unsigned char *char_after_star = 0; | |
52fadca8 | 816 | const unsigned char *cur = buffer->cur; |
041c3194 | 817 | |
041c3194 | 818 | for (; cur < buffer->rlimit; ) |
45b966db | 819 | { |
041c3194 ZW |
820 | unsigned char c = *cur++; |
821 | ||
822 | /* People like decorating comments with '*', so check for | |
823 | '/' instead for efficiency. */ | |
824 | if (c == '/') | |
45b966db | 825 | { |
52fadca8 NB |
826 | /* Don't view / then * then / as finishing the comment. */ |
827 | if ((cur[-2] == '*' && cur - 1 > buffer->cur) | |
828 | || cur - 1 == char_after_star) | |
829 | { | |
830 | buffer->cur = cur; | |
831 | return 0; | |
832 | } | |
041c3194 ZW |
833 | |
834 | /* Warn about potential nested comments, but not when | |
835 | the final character inside the comment is a '/'. | |
836 | Don't bother to get it right across escaped newlines. */ | |
837 | if (CPP_OPTION (pfile, warn_comments) && cur + 1 < buffer->rlimit | |
838 | && cur[0] == '*' && cur[1] != '/') | |
45b966db | 839 | { |
041c3194 ZW |
840 | buffer->cur = cur; |
841 | cpp_warning (pfile, "'/*' within comment"); | |
45b966db | 842 | } |
45b966db | 843 | } |
91fcd158 | 844 | else if (is_vspace (c)) |
45b966db | 845 | { |
041c3194 ZW |
846 | const unsigned char* bslash = backslash_start (pfile, cur - 2); |
847 | ||
848 | handle_newline (cur, buffer->rlimit, c); | |
849 | /* Work correctly if there is an asterisk before an | |
850 | arbirtrarily long sequence of escaped newlines. */ | |
851 | if (bslash && (bslash[-1] == '*' || bslash == char_after_star)) | |
852 | char_after_star = cur; | |
853 | else | |
854 | char_after_star = 0; | |
45b966db | 855 | } |
52fadca8 NB |
856 | else if (c == '\t') |
857 | adjust_column (pfile, cur - 1); | |
45b966db | 858 | } |
041c3194 | 859 | |
041c3194 | 860 | buffer->cur = cur; |
52fadca8 | 861 | return 1; |
45b966db ZW |
862 | } |
863 | ||
f9a0e96c ZW |
864 | /* Skip a C++ line comment. Handles escaped newlines. Returns |
865 | non-zero if a multiline comment. */ | |
041c3194 ZW |
866 | static int |
867 | skip_line_comment (pfile) | |
45b966db ZW |
868 | cpp_reader *pfile; |
869 | { | |
041c3194 ZW |
870 | cpp_buffer *buffer = pfile->buffer; |
871 | register const unsigned char *cur = buffer->cur; | |
872 | int multiline = 0; | |
873 | ||
874 | for (; cur < buffer->rlimit; ) | |
875 | { | |
876 | unsigned char c = *cur++; | |
877 | ||
91fcd158 | 878 | if (is_vspace (c)) |
45b966db | 879 | { |
041c3194 ZW |
880 | /* Check for a (trigaph?) backslash escaping the newline. */ |
881 | if (!backslash_start (pfile, cur - 2)) | |
882 | goto out; | |
883 | multiline = 1; | |
884 | handle_newline (cur, buffer->rlimit, c); | |
885 | } | |
886 | } | |
887 | cur++; | |
45b966db | 888 | |
041c3194 ZW |
889 | out: |
890 | buffer->cur = cur - 1; /* Leave newline for caller. */ | |
891 | return multiline; | |
892 | } | |
45b966db | 893 | |
52fadca8 NB |
894 | /* TAB points to a \t character. Update col_adjust so we track the |
895 | column correctly. */ | |
896 | static void | |
897 | adjust_column (pfile, tab) | |
898 | cpp_reader *pfile; | |
899 | const U_CHAR *tab; | |
900 | { | |
901 | /* Zero-based column. */ | |
902 | unsigned int col = CPP_BUF_COLUMN (pfile->buffer, tab); | |
903 | ||
904 | /* Round it up to multiple of the tabstop, but subtract 1 since the | |
905 | tab itself occupies a character position. */ | |
906 | pfile->col_adjust += (CPP_OPTION (pfile, tabstop) | |
907 | - col % CPP_OPTION (pfile, tabstop)) - 1; | |
908 | } | |
909 | ||
041c3194 ZW |
910 | /* Skips whitespace, stopping at next non-whitespace character. |
911 | Adjusts pfile->col_adjust to account for tabs. This enables tokens | |
912 | to be assigned the correct column. */ | |
913 | static void | |
914 | skip_whitespace (pfile, in_directive) | |
915 | cpp_reader *pfile; | |
916 | int in_directive; | |
917 | { | |
918 | cpp_buffer *buffer = pfile->buffer; | |
91fcd158 | 919 | unsigned short warned = 0; |
45b966db | 920 | |
91fcd158 NB |
921 | /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */ |
922 | while (buffer->cur < buffer->rlimit) | |
041c3194 | 923 | { |
91fcd158 | 924 | unsigned char c = *buffer->cur; |
45b966db | 925 | |
91fcd158 NB |
926 | if (!is_nvspace (c)) |
927 | break; | |
928 | ||
929 | buffer->cur++; | |
930 | /* Horizontal space always OK. */ | |
931 | if (c == ' ') | |
932 | continue; | |
933 | else if (c == '\t') | |
52fadca8 | 934 | adjust_column (pfile, buffer->cur - 1); |
91fcd158 NB |
935 | /* Must be \f \v or \0. */ |
936 | else if (c == '\0') | |
041c3194 | 937 | { |
91fcd158 NB |
938 | if (!warned) |
939 | cpp_warning_with_line (pfile, CPP_BUF_LINE (buffer), | |
940 | CPP_BUF_COL (buffer), | |
941 | "embedded null character ignored"); | |
942 | warned = 1; | |
45b966db | 943 | } |
041c3194 | 944 | else if (in_directive && CPP_PEDANTIC (pfile)) |
91fcd158 NB |
945 | cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer), |
946 | CPP_BUF_COL (buffer), | |
947 | "%s in preprocessing directive", | |
948 | c == '\f' ? "form feed" : "vertical tab"); | |
45b966db | 949 | } |
041c3194 | 950 | } |
45b966db | 951 | |
711b8824 ZW |
952 | /* Parse (append) an identifier. Calculates the hash value of the |
953 | token while parsing, for performance. The algorithm *must* match | |
954 | cpp_lookup(). */ | |
417f3e3a | 955 | static const U_CHAR * |
bfb9dc7f | 956 | parse_name (pfile, tok, cur, rlimit) |
45b966db | 957 | cpp_reader *pfile; |
bfb9dc7f ZW |
958 | cpp_token *tok; |
959 | const U_CHAR *cur, *rlimit; | |
45b966db | 960 | { |
711b8824 | 961 | const U_CHAR *name; |
bfb9dc7f | 962 | unsigned int len; |
711b8824 | 963 | unsigned int r; |
041c3194 | 964 | |
711b8824 ZW |
965 | name = cur; |
966 | r = 0; | |
bfb9dc7f | 967 | while (cur < rlimit) |
041c3194 | 968 | { |
bfb9dc7f ZW |
969 | if (! is_idchar (*cur)) |
970 | break; | |
5ef865d5 | 971 | /* $ is not a identifier character in the standard, but is |
e5ec2402 ZW |
972 | commonly accepted as an extension. Don't warn about it in |
973 | skipped conditional blocks. */ | |
bfb9dc7f | 974 | if (*cur == '$' && CPP_PEDANTIC (pfile) && ! pfile->skipping) |
041c3194 | 975 | { |
bfb9dc7f | 976 | CPP_BUFFER (pfile)->cur = cur; |
041c3194 ZW |
977 | cpp_pedwarn (pfile, "'$' character in identifier"); |
978 | } | |
711b8824 ZW |
979 | |
980 | r = HASHSTEP (r, cur); | |
bfb9dc7f | 981 | cur++; |
041c3194 | 982 | } |
bfb9dc7f | 983 | len = cur - name; |
45b966db | 984 | |
ba89d661 | 985 | if (tok->type == CPP_NAME && tok->val.node == 0) |
711b8824 ZW |
986 | tok->val.node = _cpp_lookup_with_hash (pfile, name, len, r); |
987 | else | |
041c3194 | 988 | { |
ba89d661 ZW |
989 | unsigned int oldlen; |
990 | U_CHAR *newname; | |
991 | ||
992 | if (tok->type == CPP_NAME) | |
993 | oldlen = tok->val.node->length; | |
994 | else | |
995 | oldlen = 1; | |
996 | ||
997 | newname = alloca (oldlen + len); | |
998 | ||
999 | if (tok->type == CPP_NAME) | |
1000 | memcpy (newname, tok->val.node->name, oldlen); | |
1001 | else | |
1002 | newname[0] = tok->val.aux; | |
bfb9dc7f | 1003 | memcpy (newname + oldlen, name, len); |
711b8824 | 1004 | tok->val.node = cpp_lookup (pfile, newname, len + oldlen); |
ba89d661 | 1005 | tok->type = CPP_NAME; |
041c3194 ZW |
1006 | } |
1007 | ||
bfb9dc7f | 1008 | return cur; |
45b966db ZW |
1009 | } |
1010 | ||
041c3194 | 1011 | /* Parse (append) a number. */ |
45b966db | 1012 | static void |
041c3194 | 1013 | parse_number (pfile, list, name) |
45b966db | 1014 | cpp_reader *pfile; |
041c3194 | 1015 | cpp_toklist *list; |
bfb9dc7f | 1016 | cpp_string *name; |
45b966db | 1017 | { |
041c3194 ZW |
1018 | const unsigned char *name_limit; |
1019 | unsigned char *namebuf; | |
1020 | cpp_buffer *buffer = pfile->buffer; | |
1021 | register const unsigned char *cur = buffer->cur; | |
45b966db | 1022 | |
041c3194 ZW |
1023 | expanded: |
1024 | name_limit = list->namebuf + list->name_cap; | |
1025 | namebuf = list->namebuf + list->name_used; | |
45b966db | 1026 | |
041c3194 ZW |
1027 | for (; cur < buffer->rlimit && namebuf < name_limit; ) |
1028 | { | |
1029 | unsigned char c = *namebuf = *cur; /* Copy a single char. */ | |
45b966db | 1030 | |
041c3194 ZW |
1031 | /* Perhaps we should accept '$' here if we accept it for |
1032 | identifiers. We know namebuf[-1] is safe, because for c to | |
1033 | be a sign we must have pushed at least one character. */ | |
1034 | if (!is_numchar (c) && c != '.' && ! VALID_SIGN (c, namebuf[-1])) | |
1035 | goto out; | |
45b966db | 1036 | |
041c3194 ZW |
1037 | namebuf++; |
1038 | cur++; | |
45b966db | 1039 | } |
64aaf407 | 1040 | |
041c3194 ZW |
1041 | /* Run out of name space? */ |
1042 | if (cur < buffer->rlimit) | |
1043 | { | |
1044 | list->name_used = namebuf - list->namebuf; | |
1045 | auto_expand_name_space (list); | |
1046 | goto expanded; | |
1047 | } | |
1048 | ||
64aaf407 | 1049 | out: |
041c3194 ZW |
1050 | buffer->cur = cur; |
1051 | name->len = namebuf - name->text; | |
1052 | list->name_used = namebuf - list->namebuf; | |
45b966db ZW |
1053 | } |
1054 | ||
041c3194 | 1055 | /* Places a string terminated by an unescaped TERMINATOR into a |
bfb9dc7f | 1056 | cpp_string, which should be expandable and thus at the top of the |
041c3194 ZW |
1057 | list's stack. Handles embedded trigraphs, if necessary, and |
1058 | escaped newlines. | |
45b966db | 1059 | |
041c3194 ZW |
1060 | Can be used for character constants (terminator = '\''), string |
1061 | constants ('"') and angled headers ('>'). Multi-line strings are | |
1062 | allowed, except for within directives. */ | |
45b966db | 1063 | |
041c3194 ZW |
1064 | static void |
1065 | parse_string (pfile, list, token, terminator) | |
45b966db | 1066 | cpp_reader *pfile; |
041c3194 ZW |
1067 | cpp_toklist *list; |
1068 | cpp_token *token; | |
1069 | unsigned int terminator; | |
45b966db | 1070 | { |
041c3194 | 1071 | cpp_buffer *buffer = pfile->buffer; |
bfb9dc7f | 1072 | cpp_string *name = &token->val.str; |
041c3194 ZW |
1073 | register const unsigned char *cur = buffer->cur; |
1074 | const unsigned char *name_limit; | |
1075 | unsigned char *namebuf; | |
1076 | unsigned int null_count = 0; | |
1077 | unsigned int trigraphed = list->name_used; | |
45b966db | 1078 | |
041c3194 ZW |
1079 | expanded: |
1080 | name_limit = list->namebuf + list->name_cap; | |
1081 | namebuf = list->namebuf + list->name_used; | |
f2d5f0cc | 1082 | |
041c3194 | 1083 | for (; cur < buffer->rlimit && namebuf < name_limit; ) |
45b966db | 1084 | { |
041c3194 | 1085 | unsigned int c = *namebuf++ = *cur++; /* Copy a single char. */ |
45b966db | 1086 | |
041c3194 ZW |
1087 | if (c == '\0') |
1088 | null_count++; | |
91fcd158 | 1089 | else if (c == terminator || is_vspace (c)) |
45b966db | 1090 | { |
041c3194 ZW |
1091 | /* Needed for trigraph_replace and multiline string warning. */ |
1092 | buffer->cur = cur; | |
5eec0563 | 1093 | |
041c3194 ZW |
1094 | /* Scan for trigraphs before checking if backslash-escaped. */ |
1095 | if ((CPP_OPTION (pfile, trigraphs) | |
1096 | || CPP_OPTION (pfile, warn_trigraphs)) | |
1097 | && namebuf - (list->namebuf + trigraphed) >= 3) | |
45b966db | 1098 | { |
041c3194 ZW |
1099 | namebuf = trigraph_replace (pfile, list->namebuf + trigraphed, |
1100 | namebuf); | |
1101 | /* The test above guarantees trigraphed will be positive. */ | |
1102 | trigraphed = namebuf - list->namebuf - 2; | |
45b966db | 1103 | } |
45b966db | 1104 | |
041c3194 | 1105 | namebuf--; /* Drop the newline / terminator from the name. */ |
91fcd158 | 1106 | if (is_vspace (c)) |
45b966db | 1107 | { |
041c3194 | 1108 | /* Drop a backslash newline, and continue. */ |
a0bff95f | 1109 | if (namebuf > list->namebuf && namebuf[-1] == '\\') |
45b966db | 1110 | { |
041c3194 ZW |
1111 | handle_newline (cur, buffer->rlimit, c); |
1112 | namebuf--; | |
1113 | continue; | |
45b966db | 1114 | } |
45b966db | 1115 | |
041c3194 | 1116 | cur--; |
45b966db | 1117 | |
f9a0e96c ZW |
1118 | /* In assembly language, silently terminate strings of |
1119 | either variety at end of line. This is a kludge | |
1120 | around not knowing where comments are. */ | |
1121 | if (CPP_OPTION (pfile, lang_asm)) | |
041c3194 | 1122 | goto out; |
64aaf407 | 1123 | |
f9a0e96c ZW |
1124 | /* Character constants and header names may not extend |
1125 | over multiple lines. In Standard C, neither may | |
1126 | strings. We accept multiline strings as an | |
041c3194 | 1127 | extension. (Even in directives - otherwise, glibc's |
f9a0e96c | 1128 | longlong.h breaks.) */ |
041c3194 ZW |
1129 | if (terminator != '"') |
1130 | goto unterminated; | |
1131 | ||
1132 | cur++; /* Move forwards again. */ | |
45b966db | 1133 | |
041c3194 ZW |
1134 | if (pfile->multiline_string_line == 0) |
1135 | { | |
1136 | pfile->multiline_string_line = token->line; | |
1137 | pfile->multiline_string_column = token->col; | |
1138 | if (CPP_PEDANTIC (pfile)) | |
1139 | cpp_pedwarn (pfile, "multi-line string constant"); | |
1140 | } | |
1141 | ||
1142 | *namebuf++ = '\n'; | |
1143 | handle_newline (cur, buffer->rlimit, c); | |
45b966db ZW |
1144 | } |
1145 | else | |
1146 | { | |
041c3194 | 1147 | unsigned char *temp; |
45b966db | 1148 | |
041c3194 ZW |
1149 | /* An odd number of consecutive backslashes represents |
1150 | an escaped terminator. */ | |
1151 | temp = namebuf - 1; | |
1152 | while (temp >= name->text && *temp == '\\') | |
1153 | temp--; | |
45b966db | 1154 | |
041c3194 ZW |
1155 | if ((namebuf - temp) & 1) |
1156 | goto out; | |
1157 | namebuf++; | |
1158 | } | |
45b966db | 1159 | } |
ff2b53ef | 1160 | } |
45b966db | 1161 | |
041c3194 ZW |
1162 | /* Run out of name space? */ |
1163 | if (cur < buffer->rlimit) | |
45b966db | 1164 | { |
041c3194 ZW |
1165 | list->name_used = namebuf - list->namebuf; |
1166 | auto_expand_name_space (list); | |
1167 | goto expanded; | |
1168 | } | |
45b966db | 1169 | |
041c3194 ZW |
1170 | /* We may not have trigraph-replaced the input for this code path, |
1171 | but as the input is in error by being unterminated we don't | |
1172 | bother. Prevent warnings about no newlines at EOF. */ | |
91fcd158 | 1173 | if (is_vspace (cur[-1])) |
041c3194 | 1174 | cur--; |
45b966db | 1175 | |
041c3194 ZW |
1176 | unterminated: |
1177 | cpp_error (pfile, "missing terminating %c character", (int) terminator); | |
476f2869 | 1178 | |
041c3194 ZW |
1179 | if (terminator == '\"' && pfile->multiline_string_line != list->line |
1180 | && pfile->multiline_string_line != 0) | |
1181 | { | |
1182 | cpp_error_with_line (pfile, pfile->multiline_string_line, | |
1183 | pfile->multiline_string_column, | |
1184 | "possible start of unterminated string literal"); | |
1185 | pfile->multiline_string_line = 0; | |
45b966db | 1186 | } |
041c3194 ZW |
1187 | |
1188 | out: | |
1189 | buffer->cur = cur; | |
1190 | name->len = namebuf - name->text; | |
1191 | list->name_used = namebuf - list->namebuf; | |
45b966db | 1192 | |
041c3194 ZW |
1193 | if (null_count > 0) |
1194 | cpp_warning (pfile, (null_count > 1 ? "null characters preserved" | |
1195 | : "null character preserved")); | |
45b966db ZW |
1196 | } |
1197 | ||
041c3194 | 1198 | /* The character TYPE helps us distinguish comment types: '*' = C |
f9a0e96c ZW |
1199 | style, '/' = C++ style. For code simplicity, the stored comment |
1200 | includes the comment start and any terminator. */ | |
041c3194 ZW |
1201 | |
1202 | #define COMMENT_START_LEN 2 | |
9e62c811 | 1203 | static void |
041c3194 ZW |
1204 | save_comment (list, token, from, len, type) |
1205 | cpp_toklist *list; | |
1206 | cpp_token *token; | |
1207 | const unsigned char *from; | |
9e62c811 | 1208 | unsigned int len; |
041c3194 | 1209 | unsigned int type; |
9e62c811 | 1210 | { |
041c3194 ZW |
1211 | unsigned char *buffer; |
1212 | ||
1213 | len += COMMENT_START_LEN; | |
9e62c811 | 1214 | |
041c3194 ZW |
1215 | if (list->name_used + len > list->name_cap) |
1216 | _cpp_expand_name_space (list, len); | |
9e62c811 | 1217 | |
bfb9dc7f | 1218 | INIT_TOKEN_STR (list, token); |
041c3194 | 1219 | token->type = CPP_COMMENT; |
bfb9dc7f | 1220 | token->val.str.len = len; |
45b966db | 1221 | |
041c3194 ZW |
1222 | buffer = list->namebuf + list->name_used; |
1223 | list->name_used += len; | |
45b966db | 1224 | |
041c3194 ZW |
1225 | /* Copy the comment. */ |
1226 | if (type == '*') | |
45b966db | 1227 | { |
041c3194 ZW |
1228 | *buffer++ = '/'; |
1229 | *buffer++ = '*'; | |
45b966db | 1230 | } |
041c3194 | 1231 | else |
ea4a453b | 1232 | { |
041c3194 ZW |
1233 | *buffer++ = type; |
1234 | *buffer++ = type; | |
ea4a453b | 1235 | } |
041c3194 | 1236 | memcpy (buffer, from, len - COMMENT_START_LEN); |
45b966db ZW |
1237 | } |
1238 | ||
041c3194 ZW |
1239 | /* |
1240 | * The tokenizer's main loop. Returns a token list, representing a | |
1241 | * logical line in the input file. On EOF after some tokens have | |
1242 | * been processed, we return immediately. Then in next call, or if | |
1243 | * EOF occurred at the beginning of a logical line, a single CPP_EOF | |
1244 | * token is placed in the list. | |
1245 | * | |
1246 | * Implementation relies almost entirely on lookback, rather than | |
1247 | * looking forwards. This means that tokenization requires just | |
1248 | * a single pass of the file, even in the presence of trigraphs and | |
1249 | * escaped newlines, providing significant performance benefits. | |
1250 | * Trigraph overhead is negligible if they are disabled, and low | |
1251 | * even when enabled. | |
1252 | */ | |
1253 | ||
91fcd158 | 1254 | #define KNOWN_DIRECTIVE() (list->directive != 0) |
041c3194 ZW |
1255 | #define MIGHT_BE_DIRECTIVE() \ |
1256 | (cur_token == &list->tokens[first_token + 1] && cur_token[-1].type == CPP_HASH) | |
45b966db | 1257 | |
041c3194 ZW |
1258 | static void |
1259 | lex_line (pfile, list) | |
45b966db | 1260 | cpp_reader *pfile; |
041c3194 | 1261 | cpp_toklist *list; |
45b966db | 1262 | { |
041c3194 ZW |
1263 | cpp_token *cur_token, *token_limit, *first; |
1264 | cpp_buffer *buffer = pfile->buffer; | |
1265 | const unsigned char *cur = buffer->cur; | |
1266 | unsigned char flags = 0; | |
1267 | unsigned int first_token = list->tokens_used; | |
45b966db | 1268 | |
041c3194 ZW |
1269 | if (!(list->flags & LIST_OFFSET)) |
1270 | (abort) (); | |
9ec7291f ZW |
1271 | |
1272 | retry: | |
041c3194 ZW |
1273 | list->file = buffer->nominal_fname; |
1274 | list->line = CPP_BUF_LINE (buffer); | |
1275 | pfile->col_adjust = 0; | |
1276 | pfile->in_lex_line = 1; | |
1277 | if (cur == buffer->buf) | |
1278 | list->flags |= BEG_OF_FILE; | |
1279 | ||
1280 | expanded: | |
1281 | token_limit = list->tokens + list->tokens_cap; | |
1282 | cur_token = list->tokens + list->tokens_used; | |
45b966db | 1283 | |
041c3194 | 1284 | for (; cur < buffer->rlimit && cur_token < token_limit;) |
45b966db | 1285 | { |
041c3194 | 1286 | unsigned char c; |
45b966db | 1287 | |
91fcd158 NB |
1288 | /* Optimize non-vertical whitespace skipping; most tokens are |
1289 | probably separated by whitespace. (' ' '\t' '\v' '\f' '\0'). */ | |
1290 | c = *cur; | |
1291 | if (is_nvspace (c)) | |
45b966db | 1292 | { |
91fcd158 NB |
1293 | buffer->cur = cur; |
1294 | skip_whitespace (pfile, (list->tokens[first_token].type == CPP_HASH | |
1295 | && cur_token > &list->tokens[first_token])); | |
041c3194 | 1296 | cur = buffer->cur; |
ff2b53ef | 1297 | |
041c3194 ZW |
1298 | flags = PREV_WHITE; |
1299 | if (cur == buffer->rlimit) | |
1300 | break; | |
91fcd158 | 1301 | c = *cur; |
45b966db | 1302 | } |
91fcd158 | 1303 | cur++; |
45b966db | 1304 | |
041c3194 ZW |
1305 | /* Initialize current token. CPP_EOF will not be fixed up by |
1306 | expand_name_space. */ | |
1307 | list->tokens_used = cur_token - list->tokens + 1; | |
1308 | cur_token->type = CPP_EOF; | |
1309 | cur_token->col = CPP_BUF_COLUMN (buffer, cur); | |
1310 | cur_token->line = CPP_BUF_LINE (buffer); | |
1311 | cur_token->flags = flags; | |
1312 | flags = 0; | |
46d07497 | 1313 | |
041c3194 ZW |
1314 | switch (c) |
1315 | { | |
1316 | case '0': case '1': case '2': case '3': case '4': | |
1317 | case '5': case '6': case '7': case '8': case '9': | |
1318 | { | |
1319 | int prev_dot; | |
46d07497 | 1320 | |
041c3194 ZW |
1321 | cur--; /* Backup character. */ |
1322 | prev_dot = PREV_TOKEN_TYPE == CPP_DOT && IMMED_TOKEN (); | |
1323 | if (prev_dot) | |
1324 | cur_token--; | |
bfb9dc7f | 1325 | INIT_TOKEN_STR (list, cur_token); |
041c3194 ZW |
1326 | /* Prepend an immediately previous CPP_DOT token. */ |
1327 | if (prev_dot) | |
1328 | { | |
1329 | if (list->name_cap == list->name_used) | |
1330 | auto_expand_name_space (list); | |
46d07497 | 1331 | |
bfb9dc7f | 1332 | cur_token->val.str.len = 1; |
041c3194 ZW |
1333 | list->namebuf[list->name_used++] = '.'; |
1334 | } | |
46d07497 | 1335 | |
041c3194 ZW |
1336 | continue_number: |
1337 | cur_token->type = CPP_NUMBER; /* Before parse_number. */ | |
1338 | buffer->cur = cur; | |
bfb9dc7f | 1339 | parse_number (pfile, list, &cur_token->val.str); |
041c3194 ZW |
1340 | cur = buffer->cur; |
1341 | } | |
1342 | /* Check for # 123 form of #line. */ | |
1343 | if (MIGHT_BE_DIRECTIVE ()) | |
1344 | list->directive = _cpp_check_linemarker (pfile, cur_token, | |
1345 | !(cur_token[-1].flags | |
1346 | & PREV_WHITE)); | |
1347 | cur_token++; | |
1348 | break; | |
46d07497 | 1349 | |
041c3194 ZW |
1350 | letter: |
1351 | case '_': | |
1352 | case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': | |
1353 | case 'g': case 'h': case 'i': case 'j': case 'k': case 'l': | |
1354 | case 'm': case 'n': case 'o': case 'p': case 'q': case 'r': | |
1355 | case 's': case 't': case 'u': case 'v': case 'w': case 'x': | |
1356 | case 'y': case 'z': | |
1357 | case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': | |
1358 | case 'G': case 'H': case 'I': case 'J': case 'K': case 'L': | |
1359 | case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': | |
1360 | case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': | |
1361 | case 'Y': case 'Z': | |
1362 | cur--; /* Backup character. */ | |
ba89d661 ZW |
1363 | |
1364 | /* In Objective C, '@' may begin certain keywords. */ | |
1365 | if (CPP_OPTION (pfile, objc) && cur_token[-1].type == CPP_OTHER | |
1366 | && cur_token[-1].val.aux == '@' && IMMED_TOKEN ()) | |
1367 | cur_token--; | |
1368 | else | |
1369 | { | |
1370 | cur_token->val.node = 0; | |
1371 | cur_token->type = CPP_NAME; /* Identifier, macro etc. */ | |
1372 | } | |
041c3194 ZW |
1373 | |
1374 | continue_name: | |
bfb9dc7f | 1375 | cur = parse_name (pfile, cur_token, cur, buffer->rlimit); |
45b966db | 1376 | |
041c3194 ZW |
1377 | if (MIGHT_BE_DIRECTIVE ()) |
1378 | list->directive = _cpp_check_directive (pfile, cur_token, | |
1379 | !(list->tokens[0].flags | |
1380 | & PREV_WHITE)); | |
92936ecf ZW |
1381 | /* Convert named operators to their proper types. */ |
1382 | if (cur_token->val.node->type == T_OPERATOR) | |
1383 | { | |
1384 | cur_token->flags |= NAMED_OP; | |
1385 | cur_token->type = cur_token->val.node->value.code; | |
1386 | } | |
1387 | ||
041c3194 ZW |
1388 | cur_token++; |
1389 | break; | |
f8f769ea | 1390 | |
041c3194 | 1391 | case '\'': |
ba89d661 ZW |
1392 | cur_token->type = CPP_CHAR; |
1393 | if (cur_token[-1].type == CPP_NAME && IMMED_TOKEN () | |
1394 | && cur_token[-1].val.node == pfile->spec_nodes->n_L) | |
1395 | BACKUP_TOKEN (CPP_WCHAR); | |
1396 | goto do_parse_string; | |
1397 | ||
041c3194 | 1398 | case '\"': |
ba89d661 | 1399 | cur_token->type = CPP_STRING; |
041c3194 | 1400 | if (cur_token[-1].type == CPP_NAME && IMMED_TOKEN () |
f9a0e96c | 1401 | && cur_token[-1].val.node == pfile->spec_nodes->n_L) |
ba89d661 ZW |
1402 | BACKUP_TOKEN (CPP_WSTRING); |
1403 | else if (CPP_OPTION (pfile, objc) | |
1404 | && cur_token[-1].type == CPP_OTHER && IMMED_TOKEN () | |
1405 | && cur_token[-1].val.aux == '@') | |
1406 | BACKUP_TOKEN (CPP_OSTRING); | |
45b966db | 1407 | |
041c3194 ZW |
1408 | do_parse_string: |
1409 | /* Here c is one of ' " or >. */ | |
bfb9dc7f | 1410 | INIT_TOKEN_STR (list, cur_token); |
041c3194 ZW |
1411 | buffer->cur = cur; |
1412 | parse_string (pfile, list, cur_token, c); | |
1413 | cur = buffer->cur; | |
1414 | cur_token++; | |
1415 | break; | |
45b966db | 1416 | |
041c3194 ZW |
1417 | case '/': |
1418 | cur_token->type = CPP_DIV; | |
1419 | if (IMMED_TOKEN ()) | |
1420 | { | |
1421 | if (PREV_TOKEN_TYPE == CPP_DIV) | |
1422 | { | |
1423 | /* We silently allow C++ comments in system headers, | |
1424 | irrespective of conformance mode, because lots of | |
1425 | broken systems do that and trying to clean it up | |
1426 | in fixincludes is a nightmare. */ | |
1427 | if (CPP_IN_SYSTEM_HEADER (pfile)) | |
1428 | goto do_line_comment; | |
1429 | else if (CPP_OPTION (pfile, cplusplus_comments)) | |
1430 | { | |
1431 | if (CPP_OPTION (pfile, c89) && CPP_PEDANTIC (pfile) | |
1432 | && ! buffer->warned_cplusplus_comments) | |
1433 | { | |
1434 | buffer->cur = cur; | |
1435 | cpp_pedwarn (pfile, | |
1436 | "C++ style comments are not allowed in ISO C89"); | |
1437 | cpp_pedwarn (pfile, | |
1438 | "(this will be reported only once per input file)"); | |
1439 | buffer->warned_cplusplus_comments = 1; | |
1440 | } | |
1441 | do_line_comment: | |
1442 | buffer->cur = cur; | |
1443 | #if 0 /* Leave until new lexer in place. */ | |
1444 | if (cur[-2] != c) | |
1445 | cpp_warning (pfile, | |
1446 | "comment start split across lines"); | |
1447 | #endif | |
1448 | if (skip_line_comment (pfile)) | |
1449 | cpp_warning (pfile, "multi-line comment"); | |
f8f769ea | 1450 | |
041c3194 ZW |
1451 | /* Back-up to first '-' or '/'. */ |
1452 | cur_token--; | |
1453 | if (!CPP_OPTION (pfile, discard_comments) | |
91fcd158 | 1454 | && (!KNOWN_DIRECTIVE() |
041c3194 ZW |
1455 | || (list->directive->flags & COMMENTS))) |
1456 | save_comment (list, cur_token++, cur, | |
1457 | buffer->cur - cur, c); | |
f9a0e96c | 1458 | else |
041c3194 ZW |
1459 | flags = PREV_WHITE; |
1460 | ||
1461 | cur = buffer->cur; | |
1462 | break; | |
1463 | } | |
1464 | } | |
1465 | } | |
1466 | cur_token++; | |
1467 | break; | |
1468 | ||
1469 | case '*': | |
1470 | cur_token->type = CPP_MULT; | |
1471 | if (IMMED_TOKEN ()) | |
45b966db | 1472 | { |
041c3194 ZW |
1473 | if (PREV_TOKEN_TYPE == CPP_DIV) |
1474 | { | |
1475 | buffer->cur = cur; | |
1476 | #if 0 /* Leave until new lexer in place. */ | |
1477 | if (cur[-2] != '/') | |
1478 | cpp_warning (pfile, | |
1479 | "comment start '/*' split across lines"); | |
1480 | #endif | |
1481 | if (skip_block_comment (pfile)) | |
1482 | cpp_error_with_line (pfile, list->line, cur_token[-1].col, | |
1483 | "unterminated comment"); | |
1484 | #if 0 /* Leave until new lexer in place. */ | |
1485 | else if (buffer->cur[-2] != '*') | |
1486 | cpp_warning (pfile, | |
1487 | "comment end '*/' split across lines"); | |
1488 | #endif | |
1489 | /* Back up to opening '/'. */ | |
1490 | cur_token--; | |
1491 | if (!CPP_OPTION (pfile, discard_comments) | |
91fcd158 | 1492 | && (!KNOWN_DIRECTIVE() |
041c3194 ZW |
1493 | || (list->directive->flags & COMMENTS))) |
1494 | save_comment (list, cur_token++, cur, | |
1495 | buffer->cur - cur, c); | |
f9a0e96c | 1496 | else |
041c3194 ZW |
1497 | flags = PREV_WHITE; |
1498 | ||
1499 | cur = buffer->cur; | |
1500 | break; | |
1501 | } | |
1502 | else if (CPP_OPTION (pfile, cplusplus)) | |
1503 | { | |
1504 | /* In C++, there are .* and ->* operators. */ | |
1505 | if (PREV_TOKEN_TYPE == CPP_DEREF) | |
1506 | BACKUP_TOKEN (CPP_DEREF_STAR); | |
1507 | else if (PREV_TOKEN_TYPE == CPP_DOT) | |
1508 | BACKUP_TOKEN (CPP_DOT_STAR); | |
1509 | } | |
45b966db | 1510 | } |
041c3194 | 1511 | cur_token++; |
f8f769ea | 1512 | break; |
45b966db | 1513 | |
041c3194 ZW |
1514 | case '\n': |
1515 | case '\r': | |
1516 | handle_newline (cur, buffer->rlimit, c); | |
1517 | if (PREV_TOKEN_TYPE == CPP_BACKSLASH) | |
45b966db | 1518 | { |
041c3194 | 1519 | if (IMMED_TOKEN ()) |
45b966db | 1520 | { |
041c3194 ZW |
1521 | /* Remove the escaped newline. Then continue to process |
1522 | any interrupted name or number. */ | |
1523 | cur_token--; | |
1524 | /* Backslash-newline may not be immediately followed by | |
1525 | EOF (C99 5.1.1.2). */ | |
1526 | if (cur >= buffer->rlimit) | |
1527 | { | |
1528 | cpp_pedwarn (pfile, "backslash-newline at end of file"); | |
1529 | break; | |
1530 | } | |
1531 | if (IMMED_TOKEN ()) | |
1532 | { | |
1533 | cur_token--; | |
1534 | if (cur_token->type == CPP_NAME) | |
1535 | goto continue_name; | |
1536 | else if (cur_token->type == CPP_NUMBER) | |
1537 | goto continue_number; | |
1538 | cur_token++; | |
1539 | } | |
1540 | /* Remember whitespace setting. */ | |
1541 | flags = cur_token->flags; | |
f8f769ea | 1542 | break; |
45b966db | 1543 | } |
041c3194 ZW |
1544 | else |
1545 | { | |
1546 | buffer->cur = cur; | |
1547 | cpp_warning (pfile, | |
1548 | "backslash and newline separated by space"); | |
1549 | } | |
1550 | } | |
1551 | else if (MIGHT_BE_DIRECTIVE ()) | |
1552 | { | |
1553 | /* "Null directive." C99 6.10.7: A preprocessing | |
1554 | directive of the form # <new-line> has no effect. | |
1555 | ||
1556 | But it is still a directive, and therefore disappears | |
1557 | from the output. */ | |
1558 | cur_token--; | |
f9a0e96c ZW |
1559 | if (cur_token->flags & PREV_WHITE |
1560 | && CPP_WTRADITIONAL (pfile)) | |
1561 | cpp_warning (pfile, "K+R C ignores #\\n with the # indented"); | |
f8f769ea | 1562 | } |
45b966db | 1563 | |
041c3194 ZW |
1564 | /* Skip vertical space until we have at least one token to |
1565 | return. */ | |
1566 | if (cur_token != &list->tokens[first_token]) | |
1567 | goto out; | |
1568 | list->line = CPP_BUF_LINE (buffer); | |
f8f769ea | 1569 | break; |
04e3ec78 | 1570 | |
041c3194 ZW |
1571 | case '-': |
1572 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_MINUS) | |
f9a0e96c | 1573 | REVISE_TOKEN (CPP_MINUS_MINUS); |
041c3194 ZW |
1574 | else |
1575 | PUSH_TOKEN (CPP_MINUS); | |
1576 | break; | |
45b966db | 1577 | |
041c3194 ZW |
1578 | make_hash: |
1579 | case '#': | |
1580 | /* The digraph flag checking ensures that ## and %:%: | |
1581 | are interpreted as CPP_PASTE, but #%: and %:# are not. */ | |
1582 | if (PREV_TOKEN_TYPE == CPP_HASH && IMMED_TOKEN () | |
1583 | && ((cur_token->flags ^ cur_token[-1].flags) & DIGRAPH) == 0) | |
1584 | REVISE_TOKEN (CPP_PASTE); | |
1585 | else | |
1586 | PUSH_TOKEN (CPP_HASH); | |
1587 | break; | |
04e3ec78 | 1588 | |
041c3194 ZW |
1589 | case ':': |
1590 | cur_token->type = CPP_COLON; | |
1591 | if (IMMED_TOKEN ()) | |
1592 | { | |
1593 | if (PREV_TOKEN_TYPE == CPP_COLON | |
1594 | && CPP_OPTION (pfile, cplusplus)) | |
1595 | BACKUP_TOKEN (CPP_SCOPE); | |
9b55f29a | 1596 | else if (CPP_OPTION (pfile, digraphs)) |
041c3194 | 1597 | { |
9b55f29a NB |
1598 | /* Digraph: "<:" is a '[' */ |
1599 | if (PREV_TOKEN_TYPE == CPP_LESS) | |
1600 | BACKUP_DIGRAPH (CPP_OPEN_SQUARE); | |
1601 | /* Digraph: "%:" is a '#' */ | |
1602 | else if (PREV_TOKEN_TYPE == CPP_MOD) | |
1603 | { | |
1604 | (--cur_token)->flags |= DIGRAPH; | |
1605 | goto make_hash; | |
1606 | } | |
041c3194 ZW |
1607 | } |
1608 | } | |
1609 | cur_token++; | |
1610 | break; | |
f8f769ea | 1611 | |
041c3194 ZW |
1612 | case '&': |
1613 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_AND) | |
1614 | REVISE_TOKEN (CPP_AND_AND); | |
1615 | else | |
1616 | PUSH_TOKEN (CPP_AND); | |
f8f769ea | 1617 | break; |
45b966db | 1618 | |
041c3194 ZW |
1619 | make_or: |
1620 | case '|': | |
1621 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_OR) | |
1622 | REVISE_TOKEN (CPP_OR_OR); | |
1623 | else | |
1624 | PUSH_TOKEN (CPP_OR); | |
1625 | break; | |
45b966db | 1626 | |
041c3194 ZW |
1627 | case '+': |
1628 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_PLUS) | |
1629 | REVISE_TOKEN (CPP_PLUS_PLUS); | |
1630 | else | |
1631 | PUSH_TOKEN (CPP_PLUS); | |
1632 | break; | |
45b966db | 1633 | |
041c3194 ZW |
1634 | case '=': |
1635 | /* This relies on equidistance of "?=" and "?" tokens. */ | |
1636 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE <= CPP_LAST_EQ) | |
1637 | REVISE_TOKEN (PREV_TOKEN_TYPE + (CPP_EQ_EQ - CPP_EQ)); | |
1638 | else | |
1639 | PUSH_TOKEN (CPP_EQ); | |
1640 | break; | |
45b966db | 1641 | |
041c3194 ZW |
1642 | case '>': |
1643 | cur_token->type = CPP_GREATER; | |
1644 | if (IMMED_TOKEN ()) | |
1645 | { | |
1646 | if (PREV_TOKEN_TYPE == CPP_GREATER) | |
1647 | BACKUP_TOKEN (CPP_RSHIFT); | |
1648 | else if (PREV_TOKEN_TYPE == CPP_MINUS) | |
1649 | BACKUP_TOKEN (CPP_DEREF); | |
9b55f29a NB |
1650 | else if (CPP_OPTION (pfile, digraphs)) |
1651 | { | |
1652 | /* Digraph: ":>" is a ']' */ | |
1653 | if (PREV_TOKEN_TYPE == CPP_COLON) | |
1654 | BACKUP_DIGRAPH (CPP_CLOSE_SQUARE); | |
1655 | /* Digraph: "%>" is a '}' */ | |
1656 | else if (PREV_TOKEN_TYPE == CPP_MOD) | |
1657 | BACKUP_DIGRAPH (CPP_CLOSE_BRACE); | |
1658 | } | |
041c3194 ZW |
1659 | } |
1660 | cur_token++; | |
1661 | break; | |
1662 | ||
1663 | case '<': | |
1664 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_LESS) | |
1665 | { | |
1666 | REVISE_TOKEN (CPP_LSHIFT); | |
1667 | break; | |
1668 | } | |
1669 | /* Is this the beginning of a header name? */ | |
91fcd158 | 1670 | if (KNOWN_DIRECTIVE () && (list->directive->flags & INCL)) |
041c3194 ZW |
1671 | { |
1672 | c = '>'; /* Terminator. */ | |
1673 | cur_token->type = CPP_HEADER_NAME; | |
1674 | goto do_parse_string; | |
1675 | } | |
1676 | PUSH_TOKEN (CPP_LESS); | |
1677 | break; | |
45b966db | 1678 | |
041c3194 ZW |
1679 | case '%': |
1680 | /* Digraph: "<%" is a '{' */ | |
1681 | cur_token->type = CPP_MOD; | |
9b55f29a NB |
1682 | if (IMMED_TOKEN () && PREV_TOKEN_TYPE == CPP_LESS |
1683 | && CPP_OPTION (pfile, digraphs)) | |
041c3194 ZW |
1684 | BACKUP_DIGRAPH (CPP_OPEN_BRACE); |
1685 | cur_token++; | |
1686 | break; | |
04e3ec78 | 1687 | |
041c3194 ZW |
1688 | case '?': |
1689 | if (cur + 1 < buffer->rlimit && *cur == '?' | |
61d0346d | 1690 | && _cpp_trigraph_map[cur[1]] && trigraph_ok (pfile, cur + 1)) |
041c3194 ZW |
1691 | { |
1692 | /* Handle trigraph. */ | |
1693 | cur++; | |
1694 | switch (*cur++) | |
1695 | { | |
1696 | case '(': goto make_open_square; | |
1697 | case ')': goto make_close_square; | |
1698 | case '<': goto make_open_brace; | |
1699 | case '>': goto make_close_brace; | |
1700 | case '=': goto make_hash; | |
1701 | case '!': goto make_or; | |
1702 | case '-': goto make_complement; | |
1703 | case '/': goto make_backslash; | |
1704 | case '\'': goto make_xor; | |
1705 | } | |
1706 | } | |
1707 | if (IMMED_TOKEN () && CPP_OPTION (pfile, cplusplus)) | |
1708 | { | |
1709 | /* GNU C++ defines <? and >? operators. */ | |
1710 | if (PREV_TOKEN_TYPE == CPP_LESS) | |
1711 | { | |
1712 | REVISE_TOKEN (CPP_MIN); | |
1713 | break; | |
1714 | } | |
1715 | else if (PREV_TOKEN_TYPE == CPP_GREATER) | |
1716 | { | |
1717 | REVISE_TOKEN (CPP_MAX); | |
1718 | break; | |
1719 | } | |
1720 | } | |
1721 | PUSH_TOKEN (CPP_QUERY); | |
1722 | break; | |
45b966db | 1723 | |
041c3194 ZW |
1724 | case '.': |
1725 | if (PREV_TOKEN_TYPE == CPP_DOT && cur_token[-2].type == CPP_DOT | |
1726 | && IMMED_TOKEN () | |
1727 | && !(cur_token[-1].flags & PREV_WHITE)) | |
1728 | { | |
1729 | cur_token -= 2; | |
1730 | PUSH_TOKEN (CPP_ELLIPSIS); | |
1731 | } | |
1732 | else | |
1733 | PUSH_TOKEN (CPP_DOT); | |
1734 | break; | |
c5a04734 | 1735 | |
041c3194 ZW |
1736 | make_complement: |
1737 | case '~': PUSH_TOKEN (CPP_COMPL); break; | |
1738 | make_xor: | |
1739 | case '^': PUSH_TOKEN (CPP_XOR); break; | |
1740 | make_open_brace: | |
1741 | case '{': PUSH_TOKEN (CPP_OPEN_BRACE); break; | |
1742 | make_close_brace: | |
1743 | case '}': PUSH_TOKEN (CPP_CLOSE_BRACE); break; | |
1744 | make_open_square: | |
1745 | case '[': PUSH_TOKEN (CPP_OPEN_SQUARE); break; | |
1746 | make_close_square: | |
1747 | case ']': PUSH_TOKEN (CPP_CLOSE_SQUARE); break; | |
1748 | make_backslash: | |
1749 | case '\\': PUSH_TOKEN (CPP_BACKSLASH); break; | |
1750 | case '!': PUSH_TOKEN (CPP_NOT); break; | |
1751 | case ',': PUSH_TOKEN (CPP_COMMA); break; | |
1752 | case ';': PUSH_TOKEN (CPP_SEMICOLON); break; | |
1753 | case '(': PUSH_TOKEN (CPP_OPEN_PAREN); break; | |
1754 | case ')': PUSH_TOKEN (CPP_CLOSE_PAREN); break; | |
6d2c2047 | 1755 | |
041c3194 ZW |
1756 | case '$': |
1757 | if (CPP_OPTION (pfile, dollars_in_ident)) | |
1758 | goto letter; | |
1759 | /* Fall through */ | |
041c3194 ZW |
1760 | default: |
1761 | cur_token->val.aux = c; | |
1762 | PUSH_TOKEN (CPP_OTHER); | |
1763 | break; | |
1764 | } | |
1765 | } | |
6d2c2047 | 1766 | |
041c3194 ZW |
1767 | /* Run out of token space? */ |
1768 | if (cur_token == token_limit) | |
1769 | { | |
1770 | list->tokens_used = cur_token - list->tokens; | |
1771 | _cpp_expand_token_space (list, 256); | |
1772 | goto expanded; | |
1773 | } | |
6d2c2047 | 1774 | |
041c3194 ZW |
1775 | cur_token->flags = flags; |
1776 | if (cur_token == &list->tokens[first_token] && pfile->done_initializing) | |
1777 | { | |
91fcd158 | 1778 | if (cur > buffer->buf && !is_vspace (cur[-1])) |
041c3194 ZW |
1779 | cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer), |
1780 | CPP_BUF_COLUMN (buffer, cur), | |
1781 | "no newline at end of file"); | |
1782 | cur_token++->type = CPP_EOF; | |
1783 | } | |
6d2c2047 | 1784 | |
041c3194 ZW |
1785 | out: |
1786 | /* All tokens are allocated, so the memory location is fixed. */ | |
1787 | first = &list->tokens[first_token]; | |
1788 | ||
1789 | /* Don't complain about the null directive, nor directives in | |
1790 | assembly source: we don't know where the comments are, and # may | |
1791 | introduce assembler pseudo-ops. Don't complain about invalid | |
1792 | directives in skipped conditional groups (6.10 p4). */ | |
1793 | if (first->type == CPP_HASH && list->directive == 0 && !pfile->skipping | |
1794 | && cur_token > first + 1 && !CPP_OPTION (pfile, lang_asm)) | |
1795 | { | |
1796 | if (first[1].type == CPP_NAME) | |
92936ecf ZW |
1797 | cpp_error (pfile, "invalid preprocessing directive #%s", |
1798 | first[1].val.node->name); | |
041c3194 ZW |
1799 | else |
1800 | cpp_error (pfile, "invalid preprocessing directive"); | |
9ec7291f ZW |
1801 | |
1802 | /* Discard this line to prevent further errors from cc1. */ | |
1803 | _cpp_clear_toklist (list); | |
1804 | goto retry; | |
041c3194 ZW |
1805 | } |
1806 | ||
91fcd158 NB |
1807 | /* Put EOF at end of known directives. This covers "directives do |
1808 | not extend beyond the end of the line (description 6.10 part 2)". */ | |
1809 | if (KNOWN_DIRECTIVE () || !pfile->done_initializing) | |
041c3194 ZW |
1810 | { |
1811 | pfile->first_directive_token = first; | |
1812 | cur_token++->type = CPP_EOF; | |
1813 | } | |
1814 | ||
6f4280ef ZW |
1815 | first->flags |= BOL; |
1816 | if (first_token != 0) | |
041c3194 ZW |
1817 | /* 6.10.3.10: Within the sequence of preprocessing tokens making |
1818 | up the invocation of a function-like macro, new line is | |
1819 | considered a normal white-space character. */ | |
1820 | first->flags |= PREV_WHITE; | |
1821 | ||
1822 | buffer->cur = cur; | |
1823 | list->tokens_used = cur_token - list->tokens; | |
1824 | pfile->in_lex_line = 0; | |
6d2c2047 ZW |
1825 | } |
1826 | ||
041c3194 | 1827 | /* Write the spelling of a token TOKEN, with any appropriate |
58fea6af ZW |
1828 | whitespace before it, to FP. PREV is the previous token, which |
1829 | is used to determine if we need to shove in an extra space in order | |
1830 | to avoid accidental token paste. If WHITE is 0, do not insert any | |
1831 | leading whitespace. */ | |
041c3194 | 1832 | static void |
58fea6af | 1833 | output_token (pfile, fp, token, prev, white) |
041c3194 | 1834 | cpp_reader *pfile; |
58fea6af | 1835 | FILE *fp; |
041c3194 | 1836 | const cpp_token *token, *prev; |
58fea6af | 1837 | int white; |
041c3194 | 1838 | { |
58fea6af | 1839 | if (white) |
041c3194 | 1840 | { |
58fea6af ZW |
1841 | int dummy; |
1842 | ||
1843 | if (token->col && (token->flags & BOL)) | |
1844 | { | |
1845 | /* Supply enough whitespace to put this token in its original | |
1846 | column. Don't bother trying to reconstruct tabs; we can't | |
1847 | get it right in general, and nothing ought to care. (Yes, | |
1848 | some things do care; the fault lies with them.) */ | |
1849 | unsigned int spaces = token->col - 1; | |
1850 | ||
1851 | while (spaces--) | |
1852 | putc (' ', fp); | |
1853 | } | |
1854 | else if (token->flags & PREV_WHITE) | |
1855 | putc (' ', fp); | |
1856 | else | |
1857 | /* Check for and prevent accidental token pasting. | |
1858 | In addition to the cases handled by can_paste, consider | |
1859 | ||
1860 | a + ++b - if there is not a space between the + and ++, it | |
1861 | will be misparsed as a++ + b. But + ## ++ doesn't produce | |
1862 | a valid token. */ | |
1863 | if (prev | |
1864 | && (can_paste (pfile, prev, token, &dummy) != CPP_EOF | |
1865 | || (prev->type == CPP_PLUS && token->type == CPP_PLUS_PLUS) | |
1866 | || (prev->type == CPP_MINUS && token->type == CPP_MINUS_MINUS))) | |
1867 | putc (' ', fp); | |
041c3194 | 1868 | } |
58fea6af ZW |
1869 | |
1870 | switch (TOKEN_SPELL (token)) | |
041c3194 | 1871 | { |
58fea6af ZW |
1872 | case SPELL_OPERATOR: |
1873 | { | |
1874 | const unsigned char *spelling; | |
1875 | ||
1876 | if (token->flags & DIGRAPH) | |
1877 | spelling = digraph_spellings[token->type - CPP_FIRST_DIGRAPH]; | |
1878 | else if (token->flags & NAMED_OP) | |
1879 | goto spell_ident; | |
1880 | else | |
1881 | spelling = TOKEN_NAME (token); | |
1882 | ||
1883 | ufputs (spelling, fp); | |
1884 | } | |
1885 | break; | |
1886 | ||
1887 | case SPELL_IDENT: | |
1888 | spell_ident: | |
1889 | ufputs (token->val.node->name, fp); | |
1890 | break; | |
1891 | ||
1892 | case SPELL_STRING: | |
1893 | { | |
ba89d661 ZW |
1894 | int left, right, tag; |
1895 | switch (token->type) | |
1896 | { | |
1897 | case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break; | |
1898 | case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break; | |
1899 | case CPP_OSTRING: left = '"'; right = '"'; tag = '@'; break; | |
1900 | case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break; | |
1901 | case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break; | |
1902 | case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break; | |
1903 | default: left = '\0'; right = '\0'; tag = '\0'; break; | |
1904 | } | |
1905 | if (tag) putc (tag, fp); | |
1906 | if (left) putc (left, fp); | |
58fea6af | 1907 | fwrite (token->val.str.text, 1, token->val.str.len, fp); |
ba89d661 | 1908 | if (right) putc (right, fp); |
58fea6af ZW |
1909 | } |
1910 | break; | |
1911 | ||
1912 | case SPELL_CHAR: | |
1913 | putc (token->val.aux, fp); | |
1914 | break; | |
1915 | ||
1916 | case SPELL_NONE: | |
1917 | /* Placemarker or EOF - no output. (Macro args are handled | |
1918 | elsewhere. */ | |
1919 | break; | |
041c3194 | 1920 | } |
58fea6af ZW |
1921 | } |
1922 | ||
1923 | /* Dump the original user's spelling of argument index ARG_NO to the | |
1924 | macro whose expansion is LIST. */ | |
1925 | static void | |
1926 | dump_param_spelling (fp, list, arg_no) | |
1927 | FILE *fp; | |
1928 | const cpp_toklist *list; | |
1929 | unsigned int arg_no; | |
1930 | { | |
1931 | const U_CHAR *param = list->namebuf; | |
1932 | ||
1933 | while (arg_no--) | |
1934 | param += ustrlen (param) + 1; | |
1935 | ufputs (param, fp); | |
1936 | } | |
1937 | ||
1938 | /* Output all the tokens of LIST, starting at TOKEN, to FP. */ | |
1939 | void | |
1940 | cpp_output_list (pfile, fp, list, token) | |
1941 | cpp_reader *pfile; | |
1942 | FILE *fp; | |
1943 | const cpp_toklist *list; | |
1944 | const cpp_token *token; | |
1945 | { | |
1946 | const cpp_token *limit = list->tokens + list->tokens_used; | |
1947 | const cpp_token *prev = 0; | |
1948 | int white = 0; | |
d6d5f795 | 1949 | |
58fea6af ZW |
1950 | while (token < limit) |
1951 | { | |
1952 | /* XXX Find some way we can write macro args from inside | |
1953 | output_token/spell_token. */ | |
1954 | if (token->type == CPP_MACRO_ARG) | |
1955 | { | |
1956 | if (white && token->flags & PREV_WHITE) | |
1957 | putc (' ', fp); | |
1958 | if (token->flags & STRINGIFY_ARG) | |
1959 | putc ('#', fp); | |
1960 | dump_param_spelling (fp, list, token->val.aux); | |
1961 | } | |
1962 | else | |
1963 | output_token (pfile, fp, token, prev, white); | |
1964 | if (token->flags & PASTE_LEFT) | |
1965 | fputs (" ##", fp); | |
1966 | prev = token; | |
1967 | token++; | |
1968 | white = 1; | |
1969 | } | |
041c3194 | 1970 | } |
d6d5f795 | 1971 | |
58fea6af | 1972 | |
041c3194 | 1973 | /* Write the spelling of a token TOKEN to BUFFER. The buffer must |
cf00a885 ZW |
1974 | already contain the enough space to hold the token's spelling. |
1975 | Returns a pointer to the character after the last character | |
1976 | written. */ | |
d6d5f795 | 1977 | |
041c3194 ZW |
1978 | static unsigned char * |
1979 | spell_token (pfile, token, buffer) | |
1980 | cpp_reader *pfile; /* Would be nice to be rid of this... */ | |
1981 | const cpp_token *token; | |
1982 | unsigned char *buffer; | |
1983 | { | |
96be6998 | 1984 | switch (TOKEN_SPELL (token)) |
041c3194 ZW |
1985 | { |
1986 | case SPELL_OPERATOR: | |
1987 | { | |
1988 | const unsigned char *spelling; | |
1989 | unsigned char c; | |
d6d5f795 | 1990 | |
041c3194 ZW |
1991 | if (token->flags & DIGRAPH) |
1992 | spelling = digraph_spellings[token->type - CPP_FIRST_DIGRAPH]; | |
92936ecf ZW |
1993 | else if (token->flags & NAMED_OP) |
1994 | goto spell_ident; | |
041c3194 | 1995 | else |
96be6998 | 1996 | spelling = TOKEN_NAME (token); |
041c3194 ZW |
1997 | |
1998 | while ((c = *spelling++) != '\0') | |
1999 | *buffer++ = c; | |
2000 | } | |
2001 | break; | |
d6d5f795 | 2002 | |
041c3194 | 2003 | case SPELL_IDENT: |
92936ecf | 2004 | spell_ident: |
bfb9dc7f ZW |
2005 | memcpy (buffer, token->val.node->name, token->val.node->length); |
2006 | buffer += token->val.node->length; | |
041c3194 | 2007 | break; |
d6d5f795 | 2008 | |
041c3194 ZW |
2009 | case SPELL_STRING: |
2010 | { | |
ba89d661 ZW |
2011 | int left, right, tag; |
2012 | switch (token->type) | |
2013 | { | |
2014 | case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break; | |
2015 | case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break; | |
2016 | case CPP_OSTRING: left = '"'; right = '"'; tag = '@'; break; | |
2017 | case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break; | |
2018 | case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break; | |
2019 | case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break; | |
2020 | default: left = '\0'; right = '\0'; tag = '\0'; break; | |
2021 | } | |
2022 | if (tag) *buffer++ = tag; | |
2023 | if (left) *buffer++ = left; | |
bfb9dc7f ZW |
2024 | memcpy (buffer, token->val.str.text, token->val.str.len); |
2025 | buffer += token->val.str.len; | |
ba89d661 | 2026 | if (right) *buffer++ = right; |
041c3194 ZW |
2027 | } |
2028 | break; | |
d6d5f795 | 2029 | |
041c3194 ZW |
2030 | case SPELL_CHAR: |
2031 | *buffer++ = token->val.aux; | |
2032 | break; | |
d6d5f795 | 2033 | |
041c3194 | 2034 | case SPELL_NONE: |
96be6998 | 2035 | cpp_ice (pfile, "Unspellable token %s", TOKEN_NAME (token)); |
041c3194 ZW |
2036 | break; |
2037 | } | |
d6d5f795 | 2038 | |
041c3194 ZW |
2039 | return buffer; |
2040 | } | |
d6d5f795 | 2041 | |
f67798e7 NB |
2042 | /* Macro expansion algorithm. |
2043 | ||
2044 | Macro expansion is implemented by a single-pass algorithm; there are | |
2045 | no rescan passes involved. cpp_get_token expands just enough to be | |
2046 | able to return a token to the caller, a consequence is that when it | |
2047 | returns the preprocessor can be in a state of mid-expansion. The | |
2048 | algorithm does not work by fully expanding a macro invocation into | |
2049 | some kind of token list, and then returning them one by one. | |
2050 | ||
2051 | Our expansion state is recorded in a context stack. We start out with | |
2052 | a single context on the stack, let's call it base context. This | |
2053 | consists of the token list returned by lex_line that forms the next | |
2054 | logical line in the source file. | |
2055 | ||
2056 | The current level in the context stack is stored in the cur_context | |
2057 | member of the cpp_reader structure. The context it references keeps, | |
2058 | amongst other things, a count of how many tokens form that context and | |
2059 | our position within those tokens. | |
2060 | ||
2061 | Fundamentally, calling cpp_get_token will return the next token from | |
2062 | the current context. If we're at the end of the current context, that | |
2063 | context is popped from the stack first, unless it is the base context, | |
2064 | in which case the next logical line is lexed from the source file. | |
2065 | ||
2066 | However, before returning the token, if it is a CPP_NAME token | |
2067 | _cpp_get_token checks to see if it is a macro and if it is enabled. | |
2068 | Each time it encounters a macro name, it calls push_macro_context. | |
2069 | This function checks that the macro should be expanded (with | |
2070 | is_macro_enabled), and if so pushes a new macro context on the stack | |
2071 | which becomes the current context. It then loops back to read the | |
2072 | first token of the macro context. | |
2073 | ||
2074 | A macro context basically consists of the token list representing the | |
2075 | macro's replacement list, which was saved in the hash table by | |
2076 | save_macro_expansion when its #define statement was parsed. If the | |
2077 | macro is function-like, it also contains the tokens that form the | |
2078 | arguments to the macro. I say more about macro arguments below, but | |
2079 | for now just saying that each argument is a set of pointers to tokens | |
2080 | is enough. | |
2081 | ||
2082 | When taking tokens from a macro context, we may get a CPP_MACRO_ARG | |
2083 | token. This represents an argument passed to the macro, with the | |
2084 | argument number stored in the token's AUX field. The argument should | |
2085 | be substituted, this is achieved by pushing an "argument context". An | |
2086 | argument context is just refers to the tokens forming the argument, | |
2087 | which are obtained directly from the macro context. The STRINGIFY | |
2088 | flag on a CPP_MACRO_ARG token indicates that the argument should be | |
2089 | stringified. | |
2090 | ||
2091 | Here's a few simple rules the context stack obeys:- | |
2092 | ||
2093 | 1) The lex_line token list is always context zero. | |
2094 | ||
2095 | 2) Context 1, if it exists, must be a macro context. | |
2096 | ||
2097 | 3) An argument context can only appear above a macro context. | |
2098 | ||
2099 | 4) A macro context can appear above the base context, another macro | |
2100 | context, or an argument context. | |
2101 | ||
2102 | 5) These imply that the minimal level of an argument context is 2. | |
2103 | ||
2104 | The only tricky thing left is ensuring that macros are enabled and | |
2105 | disabled correctly. The algorithm controls macro expansion by the | |
2106 | level of the context a token is taken from in the context stack. If a | |
2107 | token is taken from a level equal to no_expand_level (a member of | |
2108 | struct cpp_reader), no expansion is performed. | |
2109 | ||
2110 | When popping a context off the stack, if no_expand_level equals the | |
2111 | level of the popped context, it is reduced by one to match the new | |
2112 | context level, so that expansion is still disabled. It does not | |
2113 | increase if a context is pushed, though. It starts out life as | |
2114 | UINT_MAX, which has the effect that initially macro expansion is | |
2115 | enabled. I explain how this mechanism works below. | |
2116 | ||
2117 | The standard requires:- | |
2118 | ||
2119 | 1) Arguments to be fully expanded before substitution. | |
2120 | ||
2121 | 2) Stringified arguments to not be expanded, nor the tokens | |
2122 | immediately surrounding a ## operator. | |
2123 | ||
2124 | 3) Continual rescanning until there are no more macros left to | |
2125 | replace. | |
2126 | ||
2127 | 4) Once a macro has been expanded in stage 1) or 3), it cannot be | |
2128 | expanded again during later rescans. This prevents infinite | |
2129 | recursion. | |
2130 | ||
2131 | The first thing to observe is that stage 3) is mostly redundant. | |
2132 | Since a macro is disabled once it has been expanded, how can a rescan | |
2133 | find an unexpanded macro name? There are only two cases where this is | |
2134 | possible:- | |
2135 | ||
2136 | a) If the macro name results from a token paste operation. | |
2137 | ||
2138 | b) If the macro in question is a function-like macro that hasn't | |
2139 | already been expanded because previously there was not the required | |
2140 | '(' token immediately following it. This is only possible when an | |
2141 | argument is substituted, and after substitution the last token of | |
2142 | the argument can bind with a parenthesis appearing in the tokens | |
2143 | following the substitution. Note that if the '(' appears within the | |
2144 | argument, the ')' must too, as expanding macro arguments cannot | |
2145 | "suck in" tokens outside the argument. | |
2146 | ||
2147 | So we tackle this as follows. When parsing the macro invocation for | |
2148 | arguments, we record the tokens forming each argument as a list of | |
2149 | pointers to those tokens. We do not expand any tokens that are "raw", | |
2150 | i.e. directly from the macro invocation, but other tokens that come | |
2151 | from (nested) argument substitution are fully expanded. | |
2152 | ||
2153 | This is achieved by setting the no_expand_level to that of the macro | |
2154 | invocation. A CPP_MACRO_ARG token never appears in the list of tokens | |
2155 | forming an argument, because parse_args (indirectly) calls | |
2156 | get_raw_token which automatically pushes argument contexts and traces | |
2157 | into them. Since these contexts are at a higher level than the | |
2158 | no_expand_level, they get fully macro expanded. | |
2159 | ||
2160 | "Raw" and non-raw tokens are separated in arguments by null pointers, | |
2161 | with the policy that the initial state of an argument is raw. If the | |
2162 | first token is not raw, it should be preceded by a null pointer. When | |
2163 | tracing through the tokens of an argument context, each time | |
2164 | get_raw_token encounters a null pointer, it toggles the flag | |
2165 | CONTEXT_RAW. | |
2166 | ||
2167 | This flag, when set, indicates to is_macro_disabled that we are | |
2168 | reading raw tokens which should be macro-expanded. Similarly, if | |
2169 | clear, is_macro_disabled suppresses re-expansion. | |
2170 | ||
2171 | It's probably time for an example. | |
2172 | ||
2173 | #define hash # | |
2174 | #define str(x) #x | |
2175 | #define xstr(y) str(y hash) | |
2176 | str(hash) // "hash" | |
2177 | xstr(hash) // "# hash" | |
2178 | ||
2179 | In the invocation of str, parse_args turns off macro expansion and so | |
2180 | parses the argument as <hash>. This is the only token (pointer) | |
2181 | passed as the argument to str. Since <hash> is raw there is no need | |
2182 | for an initial null pointer. stringify_arg is called from | |
2183 | get_raw_token when tracing through the expansion of str, since the | |
2184 | argument has the STRINGIFY flag set. stringify_arg turns off | |
2185 | macro_expansion by setting the no_expand_level to that of the argument | |
2186 | context. Thus it gets the token <hash> and stringifies it to "hash" | |
2187 | correctly. | |
2188 | ||
2189 | Similary xstr is passed <hash>. However, when parse_args is parsing | |
2190 | the invocation of str() in xstr's expansion, get_raw_token encounters | |
2191 | a CPP_MACRO_ARG token for y. Transparently to parse_args, it pushes | |
2192 | an argument context, and enters the tokens of the argument, | |
2193 | i.e. <hash>. This is at a higher context level than parse_args | |
2194 | disabled, and so is_macro_disabled permits expansion of it and a macro | |
2195 | context is pushed on top of the argument context. This contains the | |
2196 | <#> token, and the end result is that <hash> is macro expanded. | |
2197 | However, after popping off the argument context, the <hash> of xstr's | |
2198 | expansion does not get macro expanded because we're back at the | |
2199 | no_expand_level. The end result is that the argument passed to str is | |
2200 | <NULL> <#> <NULL> <hash>. Note the nulls - policy is we start off | |
2201 | raw, <#> is not raw, but then <hash> is. | |
2202 | ||
2203 | */ | |
d6d5f795 | 2204 | |
041c3194 ZW |
2205 | |
2206 | /* Free the storage allocated for macro arguments. */ | |
2207 | static void | |
2208 | free_macro_args (args) | |
2209 | macro_args *args; | |
c5a04734 | 2210 | { |
041c3194 | 2211 | if (args->tokens) |
417f3e3a | 2212 | free ((PTR) args->tokens); |
041c3194 ZW |
2213 | free (args->ends); |
2214 | free (args); | |
c5a04734 ZW |
2215 | } |
2216 | ||
041c3194 ZW |
2217 | /* Determines if a macro has been already used (and is therefore |
2218 | disabled). */ | |
c5a04734 | 2219 | static int |
041c3194 | 2220 | is_macro_disabled (pfile, expansion, token) |
c5a04734 | 2221 | cpp_reader *pfile; |
041c3194 ZW |
2222 | const cpp_toklist *expansion; |
2223 | const cpp_token *token; | |
c5a04734 | 2224 | { |
041c3194 ZW |
2225 | cpp_context *context = CURRENT_CONTEXT (pfile); |
2226 | ||
2227 | /* Arguments on either side of ## are inserted in place without | |
2228 | macro expansion (6.10.3.3.2). Conceptually, any macro expansion | |
2229 | occurs during a later rescan pass. The effect is that we expand | |
2230 | iff we would as part of the macro's expansion list, so we should | |
2231 | drop to the macro's context. */ | |
2232 | if (IS_ARG_CONTEXT (context)) | |
c5a04734 | 2233 | { |
041c3194 ZW |
2234 | if (token->flags & PASTED) |
2235 | context--; | |
2236 | else if (!(context->flags & CONTEXT_RAW)) | |
2237 | return 1; | |
2238 | else if (context->flags & (CONTEXT_PASTEL | CONTEXT_PASTER)) | |
2239 | context--; | |
c5a04734 | 2240 | } |
c5a04734 | 2241 | |
041c3194 ZW |
2242 | /* Have we already used this macro? */ |
2243 | while (context->level > 0) | |
c5a04734 | 2244 | { |
041c3194 ZW |
2245 | if (!IS_ARG_CONTEXT (context) && context->u.list == expansion) |
2246 | return 1; | |
2247 | /* Raw argument tokens are judged based on the token list they | |
2248 | came from. */ | |
2249 | if (context->flags & CONTEXT_RAW) | |
2250 | context = pfile->contexts + context->level; | |
2251 | else | |
2252 | context--; | |
2253 | } | |
c5a04734 | 2254 | |
041c3194 ZW |
2255 | /* Function-like macros may be disabled if the '(' is not in the |
2256 | current context. We check this without disrupting the context | |
2257 | stack. */ | |
2258 | if (expansion->paramc >= 0) | |
2259 | { | |
2260 | const cpp_token *next; | |
2261 | unsigned int prev_nme; | |
c5a04734 | 2262 | |
041c3194 ZW |
2263 | context = CURRENT_CONTEXT (pfile); |
2264 | /* Drop down any contexts we're at the end of: the '(' may | |
2265 | appear in lower macro expansions, or in the rest of the file. */ | |
2266 | while (context->posn == context->count && context > pfile->contexts) | |
2267 | { | |
2268 | context--; | |
2269 | /* If we matched, we are disabled, as we appear in the | |
2270 | expansion of each macro we meet. */ | |
2271 | if (!IS_ARG_CONTEXT (context) && context->u.list == expansion) | |
2272 | return 1; | |
2273 | } | |
c5a04734 | 2274 | |
041c3194 ZW |
2275 | prev_nme = pfile->no_expand_level; |
2276 | pfile->no_expand_level = context - pfile->contexts; | |
417f3e3a | 2277 | next = _cpp_get_token (pfile); |
041c3194 ZW |
2278 | restore_macro_expansion (pfile, prev_nme); |
2279 | if (next->type != CPP_OPEN_PAREN) | |
2280 | { | |
2281 | _cpp_push_token (pfile, next); | |
b9bf5af8 | 2282 | if (CPP_WTRADITIONAL (pfile)) |
041c3194 | 2283 | cpp_warning (pfile, |
92936ecf ZW |
2284 | "function macro %s must be used with arguments in traditional C", |
2285 | token->val.node->name); | |
041c3194 ZW |
2286 | return 1; |
2287 | } | |
c5a04734 | 2288 | } |
c5a04734 | 2289 | |
041c3194 | 2290 | return 0; |
c5a04734 ZW |
2291 | } |
2292 | ||
041c3194 ZW |
2293 | /* Add a token to the set of tokens forming the arguments to the macro |
2294 | being parsed in parse_args. */ | |
2295 | static void | |
2296 | save_token (args, token) | |
2297 | macro_args *args; | |
2298 | const cpp_token *token; | |
c5a04734 | 2299 | { |
041c3194 ZW |
2300 | if (args->used == args->capacity) |
2301 | { | |
2302 | args->capacity += args->capacity + 100; | |
2303 | args->tokens = (const cpp_token **) | |
417f3e3a ZW |
2304 | xrealloc ((PTR) args->tokens, |
2305 | args->capacity * sizeof (const cpp_token *)); | |
041c3194 ZW |
2306 | } |
2307 | args->tokens[args->used++] = token; | |
c5a04734 ZW |
2308 | } |
2309 | ||
041c3194 ZW |
2310 | /* Take and save raw tokens until we finish one argument. Empty |
2311 | arguments are saved as a single CPP_PLACEMARKER token. */ | |
2312 | static const cpp_token * | |
2313 | parse_arg (pfile, var_args, paren_context, args, pcount) | |
c5a04734 | 2314 | cpp_reader *pfile; |
041c3194 ZW |
2315 | int var_args; |
2316 | unsigned int paren_context; | |
2317 | macro_args *args; | |
2318 | unsigned int *pcount; | |
c5a04734 | 2319 | { |
041c3194 ZW |
2320 | const cpp_token *token; |
2321 | unsigned int paren = 0, count = 0; | |
2322 | int raw, was_raw = 1; | |
c5a04734 | 2323 | |
041c3194 | 2324 | for (count = 0;; count++) |
c5a04734 | 2325 | { |
417f3e3a | 2326 | token = _cpp_get_token (pfile); |
c5a04734 | 2327 | |
041c3194 | 2328 | switch (token->type) |
c5a04734 | 2329 | { |
041c3194 ZW |
2330 | default: |
2331 | break; | |
c5a04734 | 2332 | |
041c3194 ZW |
2333 | case CPP_OPEN_PAREN: |
2334 | paren++; | |
2335 | break; | |
2336 | ||
2337 | case CPP_CLOSE_PAREN: | |
2338 | if (paren-- != 0) | |
2339 | break; | |
2340 | goto out; | |
2341 | ||
2342 | case CPP_COMMA: | |
2343 | /* Commas are not terminators within parantheses or var_args. */ | |
2344 | if (paren || var_args) | |
2345 | break; | |
2346 | goto out; | |
2347 | ||
2348 | case CPP_EOF: /* Error reported by caller. */ | |
2349 | goto out; | |
c5a04734 | 2350 | } |
c5a04734 | 2351 | |
041c3194 ZW |
2352 | raw = pfile->cur_context <= paren_context; |
2353 | if (raw != was_raw) | |
2354 | { | |
2355 | was_raw = raw; | |
2356 | save_token (args, 0); | |
2357 | count++; | |
c5a04734 | 2358 | } |
041c3194 | 2359 | save_token (args, token); |
c5a04734 | 2360 | } |
c5a04734 ZW |
2361 | |
2362 | out: | |
041c3194 ZW |
2363 | if (count == 0) |
2364 | { | |
2365 | /* Duplicate the placemarker. Then we can set its flags and | |
2366 | position and safely be using more than one. */ | |
2367 | save_token (args, duplicate_token (pfile, &placemarker_token)); | |
2368 | count++; | |
2369 | } | |
2370 | ||
2371 | *pcount = count; | |
2372 | return token; | |
c5a04734 ZW |
2373 | } |
2374 | ||
041c3194 ZW |
2375 | /* This macro returns true if the argument starting at offset O of arglist |
2376 | A is empty - that is, it's either a single PLACEMARKER token, or a null | |
2377 | pointer followed by a PLACEMARKER. */ | |
2378 | ||
2379 | #define empty_argument(A, O) \ | |
2380 | ((A)->tokens[O] ? (A)->tokens[O]->type == CPP_PLACEMARKER \ | |
2381 | : (A)->tokens[(O)+1]->type == CPP_PLACEMARKER) | |
2382 | ||
2383 | /* Parse the arguments making up a macro invocation. Nested arguments | |
2384 | are automatically macro expanded, but immediate macros are not | |
2385 | expanded; this enables e.g. operator # to work correctly. Returns | |
2386 | non-zero on error. */ | |
c5a04734 | 2387 | static int |
041c3194 | 2388 | parse_args (pfile, hp, args) |
c5a04734 | 2389 | cpp_reader *pfile; |
041c3194 ZW |
2390 | cpp_hashnode *hp; |
2391 | macro_args *args; | |
c5a04734 | 2392 | { |
041c3194 ZW |
2393 | const cpp_token *token; |
2394 | const cpp_toklist *macro; | |
2395 | unsigned int total = 0; | |
2396 | unsigned int paren_context = pfile->cur_context; | |
2397 | int argc = 0; | |
2398 | ||
2399 | macro = hp->value.expansion; | |
2400 | do | |
c5a04734 | 2401 | { |
041c3194 | 2402 | unsigned int count; |
c5a04734 | 2403 | |
041c3194 ZW |
2404 | token = parse_arg (pfile, (argc + 1 == macro->paramc |
2405 | && (macro->flags & VAR_ARGS)), | |
2406 | paren_context, args, &count); | |
2407 | if (argc < macro->paramc) | |
c5a04734 | 2408 | { |
041c3194 ZW |
2409 | total += count; |
2410 | args->ends[argc] = total; | |
c5a04734 | 2411 | } |
041c3194 | 2412 | argc++; |
c5a04734 | 2413 | } |
041c3194 | 2414 | while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); |
c5a04734 | 2415 | |
041c3194 ZW |
2416 | if (token->type == CPP_EOF) |
2417 | { | |
92936ecf | 2418 | cpp_error(pfile, "unterminated argument list for macro \"%s\"", hp->name); |
041c3194 ZW |
2419 | return 1; |
2420 | } | |
2421 | else if (argc < macro->paramc) | |
2422 | { | |
2423 | /* A rest argument is allowed to not appear in the invocation at all. | |
2424 | e.g. #define debug(format, args...) ... | |
2425 | debug("string"); | |
2426 | This is exactly the same as if the rest argument had received no | |
563dd08a | 2427 | tokens - debug("string",); This extension is deprecated. */ |
6fee6033 ZW |
2428 | |
2429 | if (argc + 1 == macro->paramc && (macro->flags & VAR_ARGS)) | |
041c3194 ZW |
2430 | { |
2431 | /* Duplicate the placemarker. Then we can set its flags and | |
2432 | position and safely be using more than one. */ | |
6fee6033 ZW |
2433 | cpp_token *pm = duplicate_token (pfile, &placemarker_token); |
2434 | pm->flags = VOID_REST; | |
2435 | save_token (args, pm); | |
041c3194 | 2436 | args->ends[argc] = total + 1; |
6fee6033 ZW |
2437 | |
2438 | if (CPP_OPTION (pfile, c99) && CPP_PEDANTIC (pfile)) | |
2439 | cpp_pedwarn (pfile, "ISO C99 requires rest arguments to be used"); | |
2440 | ||
041c3194 ZW |
2441 | return 0; |
2442 | } | |
2443 | else | |
2444 | { | |
92936ecf | 2445 | cpp_error (pfile, "not enough arguments for macro \"%s\"", hp->name); |
041c3194 ZW |
2446 | return 1; |
2447 | } | |
2448 | } | |
2449 | /* An empty argument to an empty function-like macro is fine. */ | |
2450 | else if (argc > macro->paramc | |
2451 | && !(macro->paramc == 0 && argc == 1 && empty_argument (args, 0))) | |
2452 | { | |
92936ecf | 2453 | cpp_error (pfile, "too many arguments for macro \"%s\"", hp->name); |
041c3194 ZW |
2454 | return 1; |
2455 | } | |
c5a04734 | 2456 | |
041c3194 ZW |
2457 | return 0; |
2458 | } | |
2459 | ||
2460 | /* Adds backslashes before all backslashes and double quotes appearing | |
2461 | in strings. Non-printable characters are converted to octal. */ | |
2462 | static U_CHAR * | |
2463 | quote_string (dest, src, len) | |
2464 | U_CHAR *dest; | |
2465 | const U_CHAR *src; | |
2466 | unsigned int len; | |
2467 | { | |
2468 | while (len--) | |
c5a04734 | 2469 | { |
041c3194 | 2470 | U_CHAR c = *src++; |
c5a04734 | 2471 | |
041c3194 | 2472 | if (c == '\\' || c == '"') |
6ab3e7dd | 2473 | { |
041c3194 ZW |
2474 | *dest++ = '\\'; |
2475 | *dest++ = c; | |
2476 | } | |
2477 | else | |
2478 | { | |
2479 | if (ISPRINT (c)) | |
2480 | *dest++ = c; | |
2481 | else | |
2482 | { | |
2483 | sprintf ((char *) dest, "\\%03o", c); | |
2484 | dest += 4; | |
2485 | } | |
6ab3e7dd | 2486 | } |
c5a04734 | 2487 | } |
c5a04734 | 2488 | |
041c3194 | 2489 | return dest; |
c5a04734 ZW |
2490 | } |
2491 | ||
041c3194 ZW |
2492 | /* Allocates a buffer to hold a token's TEXT, and converts TOKEN to a |
2493 | CPP_STRING token containing TEXT in quoted form. */ | |
2494 | static cpp_token * | |
2495 | make_string_token (token, text, len) | |
2496 | cpp_token *token; | |
2497 | const U_CHAR *text; | |
2498 | unsigned int len; | |
2499 | { | |
2500 | U_CHAR *buf; | |
2501 | ||
2502 | buf = (U_CHAR *) xmalloc (len * 4); | |
2503 | token->type = CPP_STRING; | |
2504 | token->flags = 0; | |
bfb9dc7f ZW |
2505 | token->val.str.text = buf; |
2506 | token->val.str.len = quote_string (buf, text, len) - buf; | |
041c3194 ZW |
2507 | return token; |
2508 | } | |
2509 | ||
2510 | /* Allocates and converts a temporary token to a CPP_NUMBER token, | |
2511 | evaluating to NUMBER. */ | |
2512 | static cpp_token * | |
2513 | alloc_number_token (pfile, number) | |
c5a04734 | 2514 | cpp_reader *pfile; |
041c3194 | 2515 | int number; |
c5a04734 | 2516 | { |
041c3194 ZW |
2517 | cpp_token *result; |
2518 | char *buf; | |
2519 | ||
2520 | result = get_temp_token (pfile); | |
2521 | buf = xmalloc (20); | |
2522 | sprintf (buf, "%d", number); | |
2523 | ||
2524 | result->type = CPP_NUMBER; | |
2525 | result->flags = 0; | |
bfb9dc7f ZW |
2526 | result->val.str.text = (U_CHAR *) buf; |
2527 | result->val.str.len = strlen (buf); | |
041c3194 ZW |
2528 | return result; |
2529 | } | |
c5a04734 | 2530 | |
041c3194 ZW |
2531 | /* Returns a temporary token from the temporary token store of PFILE. */ |
2532 | static cpp_token * | |
2533 | get_temp_token (pfile) | |
2534 | cpp_reader *pfile; | |
2535 | { | |
2536 | if (pfile->temp_used == pfile->temp_alloced) | |
2537 | { | |
2538 | if (pfile->temp_used == pfile->temp_cap) | |
2539 | { | |
2540 | pfile->temp_cap += pfile->temp_cap + 20; | |
2541 | pfile->temp_tokens = (cpp_token **) xrealloc | |
2542 | (pfile->temp_tokens, pfile->temp_cap * sizeof (cpp_token *)); | |
2543 | } | |
2544 | pfile->temp_tokens[pfile->temp_alloced++] = (cpp_token *) xmalloc | |
2545 | (sizeof (cpp_token)); | |
2546 | } | |
c5a04734 | 2547 | |
041c3194 ZW |
2548 | return pfile->temp_tokens[pfile->temp_used++]; |
2549 | } | |
2550 | ||
2551 | /* Release (not free) for re-use the temporary tokens of PFILE. */ | |
2552 | static void | |
2553 | release_temp_tokens (pfile) | |
2554 | cpp_reader *pfile; | |
2555 | { | |
2556 | while (pfile->temp_used) | |
c5a04734 | 2557 | { |
041c3194 | 2558 | cpp_token *token = pfile->temp_tokens[--pfile->temp_used]; |
c5a04734 | 2559 | |
96be6998 | 2560 | if (TOKEN_SPELL (token) == SPELL_STRING) |
c5a04734 | 2561 | { |
bfb9dc7f ZW |
2562 | free ((char *) token->val.str.text); |
2563 | token->val.str.text = 0; | |
c5a04734 ZW |
2564 | } |
2565 | } | |
041c3194 | 2566 | } |
c5a04734 | 2567 | |
041c3194 ZW |
2568 | /* Free all of PFILE's dynamically-allocated temporary tokens. */ |
2569 | void | |
2570 | _cpp_free_temp_tokens (pfile) | |
2571 | cpp_reader *pfile; | |
2572 | { | |
2573 | if (pfile->temp_tokens) | |
c5a04734 | 2574 | { |
041c3194 ZW |
2575 | /* It is possible, though unlikely (looking for '(' of a funlike |
2576 | macro into EOF), that we haven't released the tokens yet. */ | |
2577 | release_temp_tokens (pfile); | |
2578 | while (pfile->temp_alloced) | |
2579 | free (pfile->temp_tokens[--pfile->temp_alloced]); | |
2580 | free (pfile->temp_tokens); | |
c5a04734 ZW |
2581 | } |
2582 | ||
041c3194 ZW |
2583 | if (pfile->date) |
2584 | { | |
bfb9dc7f | 2585 | free ((char *) pfile->date->val.str.text); |
041c3194 | 2586 | free (pfile->date); |
bfb9dc7f | 2587 | free ((char *) pfile->time->val.str.text); |
041c3194 ZW |
2588 | free (pfile->time); |
2589 | } | |
c5a04734 ZW |
2590 | } |
2591 | ||
041c3194 ZW |
2592 | /* Copy TOKEN into a temporary token from PFILE's store. */ |
2593 | static cpp_token * | |
2594 | duplicate_token (pfile, token) | |
2595 | cpp_reader *pfile; | |
2596 | const cpp_token *token; | |
2597 | { | |
2598 | cpp_token *result = get_temp_token (pfile); | |
c5a04734 | 2599 | |
041c3194 | 2600 | *result = *token; |
96be6998 | 2601 | if (TOKEN_SPELL (token) == SPELL_STRING) |
041c3194 | 2602 | { |
bfb9dc7f ZW |
2603 | U_CHAR *buff = (U_CHAR *) xmalloc (token->val.str.len); |
2604 | memcpy (buff, token->val.str.text, token->val.str.len); | |
2605 | result->val.str.text = buff; | |
041c3194 ZW |
2606 | } |
2607 | return result; | |
2608 | } | |
c5a04734 | 2609 | |
041c3194 ZW |
2610 | /* Determine whether two tokens can be pasted together, and if so, |
2611 | what the resulting token is. Returns CPP_EOF if the tokens cannot | |
2612 | be pasted, or the appropriate type for the merged token if they | |
2613 | can. */ | |
2614 | static enum cpp_ttype | |
2615 | can_paste (pfile, token1, token2, digraph) | |
2616 | cpp_reader * pfile; | |
2617 | const cpp_token *token1, *token2; | |
2618 | int* digraph; | |
c5a04734 | 2619 | { |
041c3194 ZW |
2620 | enum cpp_ttype a = token1->type, b = token2->type; |
2621 | int cxx = CPP_OPTION (pfile, cplusplus); | |
c5a04734 | 2622 | |
92936ecf ZW |
2623 | /* Treat named operators as if they were ordinary NAMEs. */ |
2624 | if (token1->flags & NAMED_OP) | |
2625 | a = CPP_NAME; | |
2626 | if (token2->flags & NAMED_OP) | |
2627 | b = CPP_NAME; | |
2628 | ||
041c3194 ZW |
2629 | if (a <= CPP_LAST_EQ && b == CPP_EQ) |
2630 | return a + (CPP_EQ_EQ - CPP_EQ); | |
c5a04734 | 2631 | |
041c3194 | 2632 | switch (a) |
c5a04734 | 2633 | { |
041c3194 ZW |
2634 | case CPP_GREATER: |
2635 | if (b == a) return CPP_RSHIFT; | |
2636 | if (b == CPP_QUERY && cxx) return CPP_MAX; | |
2637 | if (b == CPP_GREATER_EQ) return CPP_RSHIFT_EQ; | |
2638 | break; | |
2639 | case CPP_LESS: | |
2640 | if (b == a) return CPP_LSHIFT; | |
2641 | if (b == CPP_QUERY && cxx) return CPP_MIN; | |
2642 | if (b == CPP_LESS_EQ) return CPP_LSHIFT_EQ; | |
9b55f29a NB |
2643 | if (CPP_OPTION (pfile, digraphs)) |
2644 | { | |
2645 | if (b == CPP_COLON) | |
2646 | {*digraph = 1; return CPP_OPEN_SQUARE;} /* <: digraph */ | |
2647 | if (b == CPP_MOD) | |
2648 | {*digraph = 1; return CPP_OPEN_BRACE;} /* <% digraph */ | |
2649 | } | |
041c3194 | 2650 | break; |
c5a04734 | 2651 | |
041c3194 ZW |
2652 | case CPP_PLUS: if (b == a) return CPP_PLUS_PLUS; break; |
2653 | case CPP_AND: if (b == a) return CPP_AND_AND; break; | |
2654 | case CPP_OR: if (b == a) return CPP_OR_OR; break; | |
c5a04734 | 2655 | |
041c3194 ZW |
2656 | case CPP_MINUS: |
2657 | if (b == a) return CPP_MINUS_MINUS; | |
2658 | if (b == CPP_GREATER) return CPP_DEREF; | |
2659 | break; | |
2660 | case CPP_COLON: | |
2661 | if (b == a && cxx) return CPP_SCOPE; | |
9b55f29a | 2662 | if (b == CPP_GREATER && CPP_OPTION (pfile, digraphs)) |
041c3194 ZW |
2663 | {*digraph = 1; return CPP_CLOSE_SQUARE;} /* :> digraph */ |
2664 | break; | |
2665 | ||
2666 | case CPP_MOD: | |
9b55f29a NB |
2667 | if (CPP_OPTION (pfile, digraphs)) |
2668 | { | |
2669 | if (b == CPP_GREATER) | |
2670 | {*digraph = 1; return CPP_CLOSE_BRACE;} /* %> digraph */ | |
2671 | if (b == CPP_COLON) | |
2672 | {*digraph = 1; return CPP_HASH;} /* %: digraph */ | |
2673 | } | |
041c3194 ZW |
2674 | break; |
2675 | case CPP_DEREF: | |
2676 | if (b == CPP_MULT && cxx) return CPP_DEREF_STAR; | |
2677 | break; | |
2678 | case CPP_DOT: | |
2679 | if (b == CPP_MULT && cxx) return CPP_DOT_STAR; | |
2680 | if (b == CPP_NUMBER) return CPP_NUMBER; | |
2681 | break; | |
2682 | ||
2683 | case CPP_HASH: | |
2684 | if (b == a && (token1->flags & DIGRAPH) == (token2->flags & DIGRAPH)) | |
2685 | /* %:%: digraph */ | |
2686 | {*digraph = (token1->flags & DIGRAPH); return CPP_PASTE;} | |
2687 | break; | |
2688 | ||
2689 | case CPP_NAME: | |
2690 | if (b == CPP_NAME) return CPP_NAME; | |
2691 | if (b == CPP_NUMBER | |
bfb9dc7f | 2692 | && is_numstart(token2->val.str.text[0])) return CPP_NAME; |
041c3194 | 2693 | if (b == CPP_CHAR |
bfb9dc7f | 2694 | && token1->val.node == pfile->spec_nodes->n_L) return CPP_WCHAR; |
041c3194 | 2695 | if (b == CPP_STRING |
bfb9dc7f | 2696 | && token1->val.node == pfile->spec_nodes->n_L) return CPP_WSTRING; |
041c3194 ZW |
2697 | break; |
2698 | ||
2699 | case CPP_NUMBER: | |
2700 | if (b == CPP_NUMBER) return CPP_NUMBER; | |
2701 | if (b == CPP_NAME) return CPP_NUMBER; | |
2702 | if (b == CPP_DOT) return CPP_NUMBER; | |
2703 | /* Numbers cannot have length zero, so this is safe. */ | |
2704 | if ((b == CPP_PLUS || b == CPP_MINUS) | |
bfb9dc7f | 2705 | && VALID_SIGN ('+', token1->val.str.text[token1->val.str.len - 1])) |
041c3194 ZW |
2706 | return CPP_NUMBER; |
2707 | break; | |
2708 | ||
ba89d661 ZW |
2709 | case CPP_OTHER: |
2710 | if (CPP_OPTION (pfile, objc) && token1->val.aux == '@') | |
2711 | { | |
2712 | if (b == CPP_NAME) return CPP_NAME; | |
2713 | if (b == CPP_STRING) return CPP_OSTRING; | |
2714 | } | |
2715 | ||
041c3194 ZW |
2716 | default: |
2717 | break; | |
c5a04734 ZW |
2718 | } |
2719 | ||
041c3194 ZW |
2720 | return CPP_EOF; |
2721 | } | |
2722 | ||
2723 | /* Check if TOKEN is to be ##-pasted with the token after it. */ | |
2724 | static const cpp_token * | |
2725 | maybe_paste_with_next (pfile, token) | |
2726 | cpp_reader *pfile; | |
2727 | const cpp_token *token; | |
2728 | { | |
2729 | cpp_token *pasted; | |
2730 | const cpp_token *second; | |
2731 | cpp_context *context = CURRENT_CONTEXT (pfile); | |
2732 | ||
2733 | /* Is this token on the LHS of ## ? */ | |
041c3194 | 2734 | |
417f3e3a ZW |
2735 | while ((token->flags & PASTE_LEFT) |
2736 | || ((context->flags & CONTEXT_PASTEL) | |
2737 | && context->posn == context->count)) | |
c5a04734 | 2738 | { |
417f3e3a ZW |
2739 | /* Suppress macro expansion for next token, but don't conflict |
2740 | with the other method of suppression. If it is an argument, | |
2741 | macro expansion within the argument will still occur. */ | |
2742 | pfile->paste_level = pfile->cur_context; | |
2743 | second = _cpp_get_token (pfile); | |
2744 | pfile->paste_level = 0; | |
2745 | ||
2746 | /* Ignore placemarker argument tokens (cannot be from an empty | |
2747 | macro since macros are not expanded). */ | |
2748 | if (token->type == CPP_PLACEMARKER) | |
2749 | pasted = duplicate_token (pfile, second); | |
2750 | else if (second->type == CPP_PLACEMARKER) | |
041c3194 | 2751 | { |
5ef865d5 ZW |
2752 | /* GCC has special extended semantics for , ## b where b is |
2753 | a varargs parameter: the comma disappears if b was given | |
2754 | no actual arguments (not merely if b is an empty | |
2755 | argument). */ | |
2756 | if (token->type == CPP_COMMA && second->flags & VOID_REST) | |
6fee6033 | 2757 | pasted = duplicate_token (pfile, second); |
417f3e3a ZW |
2758 | else |
2759 | pasted = duplicate_token (pfile, token); | |
041c3194 ZW |
2760 | } |
2761 | else | |
041c3194 | 2762 | { |
417f3e3a ZW |
2763 | int digraph = 0; |
2764 | enum cpp_ttype type = can_paste (pfile, token, second, &digraph); | |
c5a04734 | 2765 | |
417f3e3a ZW |
2766 | if (type == CPP_EOF) |
2767 | { | |
2768 | if (CPP_OPTION (pfile, warn_paste)) | |
5ef865d5 ZW |
2769 | { |
2770 | /* Do not complain about , ## <whatever> if | |
2771 | <whatever> came from a variable argument, because | |
2772 | the author probably intended the ## to trigger | |
2773 | the special extended semantics (see above). */ | |
2774 | if (token->type == CPP_COMMA | |
2775 | && IS_ARG_CONTEXT (CURRENT_CONTEXT (pfile)) | |
2776 | && ON_REST_ARG (CURRENT_CONTEXT (pfile) - 1)) | |
2777 | /* no warning */; | |
2778 | else | |
2779 | cpp_warning (pfile, | |
417f3e3a | 2780 | "pasting would not give a valid preprocessing token"); |
5ef865d5 | 2781 | } |
417f3e3a ZW |
2782 | _cpp_push_token (pfile, second); |
2783 | return token; | |
2784 | } | |
c5a04734 | 2785 | |
417f3e3a ZW |
2786 | if (type == CPP_NAME || type == CPP_NUMBER) |
2787 | { | |
2788 | /* Join spellings. */ | |
2789 | U_CHAR *buf, *end; | |
2790 | ||
2791 | pasted = get_temp_token (pfile); | |
2792 | buf = (U_CHAR *) alloca (TOKEN_LEN (token) + TOKEN_LEN (second)); | |
2793 | end = spell_token (pfile, token, buf); | |
2794 | end = spell_token (pfile, second, end); | |
2795 | *end = '\0'; | |
041c3194 | 2796 | |
417f3e3a ZW |
2797 | if (type == CPP_NAME) |
2798 | pasted->val.node = cpp_lookup (pfile, buf, end - buf); | |
2799 | else | |
2800 | { | |
2801 | pasted->val.str.text = uxstrdup (buf); | |
2802 | pasted->val.str.len = end - buf; | |
2803 | } | |
2804 | } | |
ba89d661 ZW |
2805 | else if (type == CPP_WCHAR || type == CPP_WSTRING |
2806 | || type == CPP_OSTRING) | |
417f3e3a | 2807 | pasted = duplicate_token (pfile, second); |
bfb9dc7f ZW |
2808 | else |
2809 | { | |
417f3e3a ZW |
2810 | pasted = get_temp_token (pfile); |
2811 | pasted->val.integer = 0; | |
bfb9dc7f | 2812 | } |
417f3e3a ZW |
2813 | |
2814 | pasted->type = type; | |
2815 | pasted->flags = digraph ? DIGRAPH : 0; | |
92936ecf ZW |
2816 | |
2817 | if (type == CPP_NAME && pasted->val.node->type == T_OPERATOR) | |
2818 | { | |
2819 | pasted->type = pasted->val.node->value.code; | |
2820 | pasted->flags |= NAMED_OP; | |
2821 | } | |
041c3194 ZW |
2822 | } |
2823 | ||
417f3e3a ZW |
2824 | /* The pasted token gets the whitespace flags and position of the |
2825 | first token, the PASTE_LEFT flag of the second token, plus the | |
2826 | PASTED flag to indicate it is the result of a paste. However, we | |
2827 | want to preserve the DIGRAPH flag. */ | |
2828 | pasted->flags &= ~(PREV_WHITE | BOL | PASTE_LEFT); | |
2829 | pasted->flags |= ((token->flags & (PREV_WHITE | BOL)) | |
2830 | | (second->flags & PASTE_LEFT) | PASTED); | |
2831 | pasted->col = token->col; | |
2832 | pasted->line = token->line; | |
2833 | ||
2834 | /* See if there is another token to be pasted onto the one we just | |
2835 | constructed. */ | |
2836 | token = pasted; | |
2837 | context = CURRENT_CONTEXT (pfile); | |
2838 | /* and loop */ | |
041c3194 | 2839 | } |
417f3e3a | 2840 | return token; |
041c3194 ZW |
2841 | } |
2842 | ||
2843 | /* Convert a token sequence to a single string token according to the | |
2844 | rules of the ISO C #-operator. */ | |
2845 | #define INIT_SIZE 200 | |
2846 | static cpp_token * | |
2847 | stringify_arg (pfile, token) | |
c5a04734 | 2848 | cpp_reader *pfile; |
041c3194 | 2849 | const cpp_token *token; |
c5a04734 | 2850 | { |
041c3194 ZW |
2851 | cpp_token *result; |
2852 | unsigned char *main_buf; | |
2853 | unsigned int prev_value, backslash_count = 0; | |
2854 | unsigned int buf_used = 0, whitespace = 0, buf_cap = INIT_SIZE; | |
c5a04734 | 2855 | |
417f3e3a | 2856 | push_arg_context (pfile, token); |
041c3194 ZW |
2857 | prev_value = prevent_macro_expansion (pfile); |
2858 | main_buf = (unsigned char *) xmalloc (buf_cap); | |
c5a04734 | 2859 | |
041c3194 ZW |
2860 | result = get_temp_token (pfile); |
2861 | ASSIGN_FLAGS_AND_POS (result, token); | |
2862 | ||
417f3e3a | 2863 | for (; (token = _cpp_get_token (pfile))->type != CPP_EOF; ) |
c5a04734 | 2864 | { |
041c3194 ZW |
2865 | int escape; |
2866 | unsigned char *buf; | |
2867 | unsigned int len = TOKEN_LEN (token); | |
c5a04734 | 2868 | |
96be6998 ZW |
2869 | if (token->type == CPP_PLACEMARKER) |
2870 | continue; | |
2871 | ||
041c3194 ZW |
2872 | escape = (token->type == CPP_STRING || token->type == CPP_WSTRING |
2873 | || token->type == CPP_CHAR || token->type == CPP_WCHAR); | |
2874 | if (escape) | |
2875 | len *= 4 + 1; | |
2876 | ||
2877 | if (buf_used + len > buf_cap) | |
c5a04734 | 2878 | { |
041c3194 ZW |
2879 | buf_cap = buf_used + len + INIT_SIZE; |
2880 | main_buf = xrealloc (main_buf, buf_cap); | |
2881 | } | |
c5a04734 | 2882 | |
041c3194 ZW |
2883 | if (whitespace && (token->flags & PREV_WHITE)) |
2884 | main_buf[buf_used++] = ' '; | |
c5a04734 | 2885 | |
041c3194 ZW |
2886 | if (escape) |
2887 | buf = (unsigned char *) xmalloc (len); | |
2888 | else | |
2889 | buf = main_buf + buf_used; | |
2890 | ||
2891 | len = spell_token (pfile, token, buf) - buf; | |
2892 | if (escape) | |
2893 | { | |
2894 | buf_used = quote_string (&main_buf[buf_used], buf, len) - main_buf; | |
2895 | free (buf); | |
2896 | } | |
2897 | else | |
2898 | buf_used += len; | |
c5a04734 | 2899 | |
041c3194 ZW |
2900 | whitespace = 1; |
2901 | if (token->type == CPP_BACKSLASH) | |
2902 | backslash_count++; | |
2903 | else | |
2904 | backslash_count = 0; | |
2905 | } | |
c5a04734 | 2906 | |
041c3194 ZW |
2907 | /* Ignore the final \ of invalid string literals. */ |
2908 | if (backslash_count & 1) | |
2909 | { | |
2910 | cpp_warning (pfile, "invalid string literal, ignoring final '\\'"); | |
2911 | buf_used--; | |
2912 | } | |
c5a04734 | 2913 | |
041c3194 | 2914 | result->type = CPP_STRING; |
bfb9dc7f ZW |
2915 | result->val.str.text = main_buf; |
2916 | result->val.str.len = buf_used; | |
041c3194 ZW |
2917 | restore_macro_expansion (pfile, prev_value); |
2918 | return result; | |
2919 | } | |
c5a04734 | 2920 | |
041c3194 ZW |
2921 | /* Allocate more room on the context stack of PFILE. */ |
2922 | static void | |
2923 | expand_context_stack (pfile) | |
2924 | cpp_reader *pfile; | |
2925 | { | |
2926 | pfile->context_cap += pfile->context_cap + 20; | |
2927 | pfile->contexts = (cpp_context *) | |
2928 | xrealloc (pfile->contexts, pfile->context_cap * sizeof (cpp_context)); | |
2929 | } | |
c5a04734 | 2930 | |
041c3194 ZW |
2931 | /* Push the context of macro NODE onto the context stack. TOKEN is |
2932 | the CPP_NAME token invoking the macro. */ | |
417f3e3a ZW |
2933 | static int |
2934 | push_macro_context (pfile, token) | |
041c3194 | 2935 | cpp_reader *pfile; |
041c3194 ZW |
2936 | const cpp_token *token; |
2937 | { | |
2938 | unsigned char orig_flags; | |
2939 | macro_args *args; | |
2940 | cpp_context *context; | |
417f3e3a | 2941 | cpp_hashnode *node = token->val.node; |
c5a04734 | 2942 | |
041c3194 ZW |
2943 | /* Token's flags may change when parsing args containing a nested |
2944 | invocation of this macro. */ | |
2945 | orig_flags = token->flags & (PREV_WHITE | BOL); | |
2946 | args = 0; | |
2947 | if (node->value.expansion->paramc >= 0) | |
c5a04734 | 2948 | { |
041c3194 ZW |
2949 | unsigned int error, prev_nme; |
2950 | ||
2951 | /* Allocate room for the argument contexts, and parse them. */ | |
2952 | args = (macro_args *) xmalloc (sizeof (macro_args)); | |
2953 | args->ends = (unsigned int *) | |
2954 | xmalloc (node->value.expansion->paramc * sizeof (unsigned int)); | |
2955 | args->tokens = 0; | |
2956 | args->capacity = 0; | |
2957 | args->used = 0; | |
2958 | args->level = pfile->cur_context; | |
2959 | ||
2960 | prev_nme = prevent_macro_expansion (pfile); | |
2961 | pfile->args = args; | |
2962 | error = parse_args (pfile, node, args); | |
2963 | pfile->args = 0; | |
2964 | restore_macro_expansion (pfile, prev_nme); | |
2965 | if (error) | |
2966 | { | |
2967 | free_macro_args (args); | |
417f3e3a | 2968 | return 1; |
041c3194 | 2969 | } |
c5a04734 | 2970 | } |
c5a04734 | 2971 | |
041c3194 ZW |
2972 | /* Now push its context. */ |
2973 | pfile->cur_context++; | |
2974 | if (pfile->cur_context == pfile->context_cap) | |
2975 | expand_context_stack (pfile); | |
2976 | ||
2977 | context = CURRENT_CONTEXT (pfile); | |
2978 | context->u.list = node->value.expansion; | |
2979 | context->args = args; | |
2980 | context->posn = 0; | |
2981 | context->count = context->u.list->tokens_used; | |
2982 | context->level = pfile->cur_context; | |
2983 | context->flags = 0; | |
2984 | context->pushed_token = 0; | |
2985 | ||
2986 | /* Set the flags of the first token. We know there must | |
2987 | be one, empty macros are a single placemarker token. */ | |
2988 | MODIFY_FLAGS_AND_POS (&context->u.list->tokens[0], token, orig_flags); | |
2989 | ||
417f3e3a | 2990 | return 0; |
c5a04734 ZW |
2991 | } |
2992 | ||
041c3194 ZW |
2993 | /* Push an argument to the current macro onto the context stack. |
2994 | TOKEN is the MACRO_ARG token representing the argument expansion. */ | |
417f3e3a | 2995 | static void |
041c3194 ZW |
2996 | push_arg_context (pfile, token) |
2997 | cpp_reader *pfile; | |
2998 | const cpp_token *token; | |
c5a04734 | 2999 | { |
041c3194 ZW |
3000 | cpp_context *context; |
3001 | macro_args *args; | |
3002 | ||
3003 | pfile->cur_context++; | |
3004 | if (pfile->cur_context == pfile->context_cap) | |
3005 | expand_context_stack (pfile); | |
3006 | ||
3007 | context = CURRENT_CONTEXT (pfile); | |
3008 | args = context[-1].args; | |
3009 | ||
3010 | context->count = token->val.aux ? args->ends[token->val.aux - 1]: 0; | |
3011 | context->u.arg = args->tokens + context->count; | |
3012 | context->count = args->ends[token->val.aux] - context->count; | |
3013 | context->args = 0; | |
3014 | context->posn = 0; | |
3015 | context->level = args->level; | |
3016 | context->flags = CONTEXT_ARG | CONTEXT_RAW; | |
3017 | context->pushed_token = 0; | |
3018 | ||
3019 | /* Set the flags of the first token. There is one. */ | |
3020 | { | |
3021 | const cpp_token *first = context->u.arg[0]; | |
3022 | if (!first) | |
3023 | first = context->u.arg[1]; | |
c5a04734 | 3024 | |
041c3194 ZW |
3025 | MODIFY_FLAGS_AND_POS ((cpp_token *) first, token, |
3026 | token->flags & (PREV_WHITE | BOL)); | |
3027 | } | |
c5a04734 | 3028 | |
041c3194 ZW |
3029 | if (token->flags & PASTE_LEFT) |
3030 | context->flags |= CONTEXT_PASTEL; | |
3031 | if (pfile->paste_level) | |
3032 | context->flags |= CONTEXT_PASTER; | |
c5a04734 ZW |
3033 | } |
3034 | ||
041c3194 ZW |
3035 | /* "Unget" a token. It is effectively inserted in the token queue and |
3036 | will be returned by the next call to get_raw_token. */ | |
c5a04734 | 3037 | void |
041c3194 | 3038 | _cpp_push_token (pfile, token) |
c5a04734 | 3039 | cpp_reader *pfile; |
041c3194 | 3040 | const cpp_token *token; |
c5a04734 | 3041 | { |
041c3194 | 3042 | cpp_context *context = CURRENT_CONTEXT (pfile); |
96be6998 ZW |
3043 | |
3044 | if (context->posn > 0) | |
3045 | { | |
3046 | const cpp_token *prev; | |
3047 | if (IS_ARG_CONTEXT (context)) | |
3048 | prev = context->u.arg[context->posn - 1]; | |
3049 | else | |
3050 | prev = &context->u.list->tokens[context->posn - 1]; | |
3051 | ||
3052 | if (prev == token) | |
3053 | { | |
3054 | context->posn--; | |
3055 | return; | |
3056 | } | |
3057 | } | |
3058 | ||
041c3194 ZW |
3059 | if (context->pushed_token) |
3060 | cpp_ice (pfile, "two tokens pushed in a row"); | |
3061 | if (token->type != CPP_EOF) | |
3062 | context->pushed_token = token; | |
3063 | /* Don't push back a directive's CPP_EOF, step back instead. */ | |
3064 | else if (pfile->cur_context == 0) | |
3065 | pfile->contexts[0].posn--; | |
3066 | } | |
c5a04734 | 3067 | |
041c3194 ZW |
3068 | /* Handle a preprocessing directive. TOKEN is the CPP_HASH token |
3069 | introducing the directive. */ | |
3070 | static void | |
3071 | process_directive (pfile, token) | |
3072 | cpp_reader *pfile; | |
3073 | const cpp_token *token; | |
3074 | { | |
3075 | const struct directive *d = pfile->token_list.directive; | |
3076 | int prev_nme = 0; | |
3077 | ||
3078 | /* Skip over the directive name. */ | |
3079 | if (token[1].type == CPP_NAME) | |
3080 | _cpp_get_raw_token (pfile); | |
3081 | else if (token[1].type != CPP_NUMBER) | |
96be6998 | 3082 | cpp_ice (pfile, "directive begins with %s?!", TOKEN_NAME (token)); |
041c3194 | 3083 | |
041c3194 ZW |
3084 | if (! (d->flags & EXPAND)) |
3085 | prev_nme = prevent_macro_expansion (pfile); | |
3086 | (void) (*d->handler) (pfile); | |
3087 | if (! (d->flags & EXPAND)) | |
3088 | restore_macro_expansion (pfile, prev_nme); | |
3089 | _cpp_skip_rest_of_line (pfile); | |
3090 | } | |
c5a04734 | 3091 | |
041c3194 ZW |
3092 | /* The external interface to return the next token. All macro |
3093 | expansion and directive processing is handled internally, the | |
3094 | caller only ever sees the output after preprocessing. */ | |
3095 | const cpp_token * | |
3096 | cpp_get_token (pfile) | |
3097 | cpp_reader *pfile; | |
3098 | { | |
3099 | const cpp_token *token; | |
417f3e3a | 3100 | /* Loop till we hit a non-directive, non-placemarker token. */ |
041c3194 ZW |
3101 | for (;;) |
3102 | { | |
417f3e3a ZW |
3103 | token = _cpp_get_token (pfile); |
3104 | ||
3105 | if (token->type == CPP_PLACEMARKER) | |
3106 | continue; | |
3107 | ||
3108 | if (token->type == CPP_HASH && token->flags & BOL | |
041c3194 | 3109 | && pfile->token_list.directive) |
c5a04734 | 3110 | { |
041c3194 ZW |
3111 | process_directive (pfile, token); |
3112 | continue; | |
c5a04734 ZW |
3113 | } |
3114 | ||
417f3e3a ZW |
3115 | return token; |
3116 | } | |
3117 | } | |
3118 | ||
3119 | /* The internal interface to return the next token. There are two | |
3120 | differences between the internal and external interfaces: the | |
3121 | internal interface may return a PLACEMARKER token, and it does not | |
3122 | process directives. */ | |
3123 | const cpp_token * | |
3124 | _cpp_get_token (pfile) | |
3125 | cpp_reader *pfile; | |
3126 | { | |
6ead1e99 | 3127 | const cpp_token *token, *old_token; |
417f3e3a ZW |
3128 | cpp_hashnode *node; |
3129 | ||
3130 | /* Loop until we hit a non-macro token. */ | |
3131 | for (;;) | |
3132 | { | |
3133 | token = get_raw_token (pfile); | |
3134 | ||
041c3194 ZW |
3135 | /* Short circuit EOF. */ |
3136 | if (token->type == CPP_EOF) | |
3137 | return token; | |
417f3e3a ZW |
3138 | |
3139 | /* If we are skipping... */ | |
3140 | if (pfile->skipping) | |
c5a04734 | 3141 | { |
417f3e3a ZW |
3142 | /* we still have to process directives, */ |
3143 | if (pfile->token_list.directive) | |
3144 | return token; | |
3145 | ||
3146 | /* but everything else is ignored. */ | |
041c3194 ZW |
3147 | _cpp_skip_rest_of_line (pfile); |
3148 | continue; | |
3149 | } | |
c5a04734 | 3150 | |
417f3e3a ZW |
3151 | /* If there's a potential control macro and we get here, then that |
3152 | #ifndef didn't cover the entire file and its argument shouldn't | |
3153 | be taken as a control macro. */ | |
3154 | pfile->potential_control_macro = 0; | |
c5a04734 | 3155 | |
bbdac7d0 ZW |
3156 | /* If we are rescanning preprocessed input, no macro expansion or |
3157 | token pasting may occur. */ | |
3158 | if (CPP_OPTION (pfile, preprocessed)) | |
3159 | return token; | |
3160 | ||
6ead1e99 ZW |
3161 | old_token = token; |
3162 | ||
417f3e3a ZW |
3163 | /* See if there's a token to paste with this one. */ |
3164 | if (!pfile->paste_level) | |
3165 | token = maybe_paste_with_next (pfile, token); | |
c5a04734 | 3166 | |
417f3e3a | 3167 | /* If it isn't a macro, return it now. */ |
92936ecf | 3168 | if (token->type != CPP_NAME || token->val.node->type == T_VOID) |
417f3e3a | 3169 | return token; |
c5a04734 | 3170 | |
92936ecf | 3171 | /* Is macro expansion disabled in general, or are we in the |
6ead1e99 ZW |
3172 | middle of a token paste, or was this token just pasted? |
3173 | (Note we don't check token->flags & PASTED, because that | |
3174 | counts tokens that were pasted at some point in the past, | |
3175 | we're only interested in tokens that were pasted by this call | |
3176 | to maybe_paste_with_next.) */ | |
3177 | if (pfile->no_expand_level == pfile->cur_context | |
3178 | || pfile->paste_level | |
3179 | || (token != old_token | |
3180 | && pfile->no_expand_level + 1 == pfile->cur_context)) | |
417f3e3a | 3181 | return token; |
6ead1e99 | 3182 | |
417f3e3a ZW |
3183 | node = token->val.node; |
3184 | if (node->type != T_MACRO) | |
3185 | return special_symbol (pfile, node, token); | |
c5a04734 | 3186 | |
041c3194 ZW |
3187 | if (is_macro_disabled (pfile, node->value.expansion, token)) |
3188 | return token; | |
c5a04734 | 3189 | |
417f3e3a ZW |
3190 | if (pfile->cur_context > CPP_STACK_MAX) |
3191 | { | |
3192 | cpp_error (pfile, "macros nested too deep invoking '%s'", node->name); | |
3193 | return token; | |
3194 | } | |
3195 | ||
3196 | if (push_macro_context (pfile, token)) | |
3197 | return token; | |
3198 | /* else loop */ | |
041c3194 | 3199 | } |
041c3194 | 3200 | } |
c5a04734 | 3201 | |
041c3194 ZW |
3202 | /* Returns the next raw token, i.e. without performing macro |
3203 | expansion. Argument contexts are automatically entered. */ | |
3204 | static const cpp_token * | |
3205 | get_raw_token (pfile) | |
3206 | cpp_reader *pfile; | |
3207 | { | |
3208 | const cpp_token *result; | |
417f3e3a | 3209 | cpp_context *context; |
c5a04734 | 3210 | |
417f3e3a | 3211 | for (;;) |
041c3194 | 3212 | { |
417f3e3a ZW |
3213 | context = CURRENT_CONTEXT (pfile); |
3214 | if (context->pushed_token) | |
041c3194 | 3215 | { |
417f3e3a ZW |
3216 | result = context->pushed_token; |
3217 | context->pushed_token = 0; | |
6fee6033 | 3218 | return result; /* Cannot be a CPP_MACRO_ARG */ |
417f3e3a ZW |
3219 | } |
3220 | else if (context->posn == context->count) | |
3221 | { | |
3222 | if (pop_context (pfile)) | |
3223 | return &eof_token; | |
3224 | continue; | |
3225 | } | |
6fee6033 | 3226 | else if (IS_ARG_CONTEXT (context)) |
417f3e3a | 3227 | { |
6fee6033 ZW |
3228 | result = context->u.arg[context->posn++]; |
3229 | if (result == 0) | |
c5a04734 | 3230 | { |
6fee6033 | 3231 | context->flags ^= CONTEXT_RAW; |
041c3194 | 3232 | result = context->u.arg[context->posn++]; |
c5a04734 | 3233 | } |
6fee6033 | 3234 | return result; /* Cannot be a CPP_MACRO_ARG */ |
041c3194 | 3235 | } |
c5a04734 | 3236 | |
6fee6033 ZW |
3237 | result = &context->u.list->tokens[context->posn++]; |
3238 | ||
417f3e3a ZW |
3239 | if (result->type != CPP_MACRO_ARG) |
3240 | return result; | |
3241 | ||
3242 | if (result->flags & STRINGIFY_ARG) | |
3243 | return stringify_arg (pfile, result); | |
3244 | ||
3245 | push_arg_context (pfile, result); | |
3246 | } | |
041c3194 | 3247 | } |
c5a04734 | 3248 | |
041c3194 ZW |
3249 | /* Internal interface to get the token without macro expanding. */ |
3250 | const cpp_token * | |
3251 | _cpp_get_raw_token (pfile) | |
3252 | cpp_reader *pfile; | |
3253 | { | |
3254 | int prev_nme = prevent_macro_expansion (pfile); | |
417f3e3a | 3255 | const cpp_token *result = _cpp_get_token (pfile); |
041c3194 ZW |
3256 | restore_macro_expansion (pfile, prev_nme); |
3257 | return result; | |
3258 | } | |
c5a04734 | 3259 | |
041c3194 ZW |
3260 | /* A thin wrapper to lex_line. CLEAR is non-zero if the current token |
3261 | list should be overwritten, or zero if we need to append | |
3262 | (typically, if we are within the arguments to a macro, or looking | |
3263 | for the '(' to start a function-like macro invocation). */ | |
3264 | static int | |
3265 | lex_next (pfile, clear) | |
3266 | cpp_reader *pfile; | |
3267 | int clear; | |
3268 | { | |
3269 | cpp_toklist *list = &pfile->token_list; | |
3270 | const cpp_token *old_list = list->tokens; | |
3271 | unsigned int old_used = list->tokens_used; | |
c5a04734 | 3272 | |
041c3194 | 3273 | if (clear) |
c5a04734 | 3274 | { |
041c3194 ZW |
3275 | /* Release all temporary tokens. */ |
3276 | _cpp_clear_toklist (list); | |
3277 | pfile->contexts[0].posn = 0; | |
3278 | if (pfile->temp_used) | |
3279 | release_temp_tokens (pfile); | |
c5a04734 | 3280 | } |
041c3194 ZW |
3281 | lex_line (pfile, list); |
3282 | pfile->contexts[0].count = list->tokens_used; | |
c5a04734 | 3283 | |
041c3194 | 3284 | if (!clear && pfile->args) |
c5a04734 | 3285 | { |
041c3194 ZW |
3286 | /* Fix up argument token pointers. */ |
3287 | if (old_list != list->tokens) | |
3288 | { | |
3289 | unsigned int i; | |
3290 | ||
3291 | for (i = 0; i < pfile->args->used; i++) | |
3292 | { | |
3293 | const cpp_token *token = pfile->args->tokens[i]; | |
3294 | if (token >= old_list && token < old_list + old_used) | |
3295 | pfile->args->tokens[i] = (const cpp_token *) | |
3296 | ((char *) token + ((char *) list->tokens - (char *) old_list)); | |
3297 | } | |
3298 | } | |
3299 | ||
3300 | /* 6.10.3 paragraph 11: If there are sequences of preprocessing | |
3301 | tokens within the list of arguments that would otherwise act as | |
3302 | preprocessing directives, the behavior is undefined. | |
3303 | ||
3304 | This implementation will report a hard error and treat the | |
3305 | 'sequence of preprocessing tokens' as part of the macro argument, | |
3306 | not a directive. | |
3307 | ||
3308 | Note if pfile->args == 0, we're OK since we're only inside a | |
3309 | macro argument after a '('. */ | |
3310 | if (list->directive) | |
3311 | { | |
3312 | cpp_error_with_line (pfile, list->tokens[old_used].line, | |
3313 | list->tokens[old_used].col, | |
3314 | "#%s may not be used inside a macro argument", | |
3315 | list->directive->name); | |
91fcd158 | 3316 | return 1; |
041c3194 | 3317 | } |
c5a04734 ZW |
3318 | } |
3319 | ||
041c3194 | 3320 | return 0; |
c5a04734 ZW |
3321 | } |
3322 | ||
417f3e3a ZW |
3323 | /* Pops a context off the context stack. If we're at the bottom, lexes |
3324 | the next logical line. Returns EOF if we're at the end of the | |
5ef865d5 | 3325 | argument list to the # operator, or we should not "overflow" |
041c3194 ZW |
3326 | into the rest of the file (e.g. 6.10.3.1.1). */ |
3327 | static int | |
417f3e3a | 3328 | pop_context (pfile) |
041c3194 ZW |
3329 | cpp_reader *pfile; |
3330 | { | |
3331 | cpp_context *context; | |
3fef5b2b | 3332 | |
041c3194 | 3333 | if (pfile->cur_context == 0) |
417f3e3a ZW |
3334 | { |
3335 | /* If we are currently processing a directive, do not advance. 6.10 | |
3336 | paragraph 2: A new-line character ends the directive even if it | |
3337 | occurs within what would otherwise be an invocation of a | |
3338 | function-like macro. */ | |
3339 | if (pfile->token_list.directive) | |
3340 | return 1; | |
3341 | ||
3342 | return lex_next (pfile, pfile->no_expand_level == UINT_MAX); | |
3343 | } | |
041c3194 ZW |
3344 | |
3345 | /* Argument contexts, when parsing args or handling # operator | |
3346 | return CPP_EOF at the end. */ | |
3347 | context = CURRENT_CONTEXT (pfile); | |
3348 | if (IS_ARG_CONTEXT (context) && pfile->cur_context == pfile->no_expand_level) | |
3349 | return 1; | |
3350 | ||
3351 | /* Free resources when leaving macro contexts. */ | |
3352 | if (context->args) | |
3353 | free_macro_args (context->args); | |
3354 | ||
3355 | if (pfile->cur_context == pfile->no_expand_level) | |
3356 | pfile->no_expand_level--; | |
3357 | pfile->cur_context--; | |
3358 | ||
3359 | return 0; | |
3360 | } | |
3361 | ||
041c3194 ZW |
3362 | /* Turn off macro expansion at the current context level. */ |
3363 | static unsigned int | |
3364 | prevent_macro_expansion (pfile) | |
3365 | cpp_reader *pfile; | |
3366 | { | |
3367 | unsigned int prev_value = pfile->no_expand_level; | |
3368 | pfile->no_expand_level = pfile->cur_context; | |
3369 | return prev_value; | |
3370 | } | |
3371 | ||
3372 | /* Restore macro expansion to its previous state. */ | |
3373 | static void | |
3374 | restore_macro_expansion (pfile, prev_value) | |
3375 | cpp_reader *pfile; | |
3376 | unsigned int prev_value; | |
3377 | { | |
3378 | pfile->no_expand_level = prev_value; | |
3379 | } | |
3380 | ||
3381 | /* Used by cpperror.c to obtain the correct line and column to report | |
3382 | in a diagnostic. */ | |
3383 | unsigned int | |
3384 | _cpp_get_line (pfile, pcol) | |
3385 | cpp_reader *pfile; | |
3386 | unsigned int *pcol; | |
3387 | { | |
3388 | unsigned int index; | |
3389 | const cpp_token *cur_token; | |
3390 | ||
3391 | if (pfile->in_lex_line) | |
3392 | index = pfile->token_list.tokens_used; | |
3393 | else | |
3394 | index = pfile->contexts[0].posn; | |
3395 | ||
6ead1e99 ZW |
3396 | if (index == 0) |
3397 | { | |
3398 | if (pcol) | |
3399 | *pcol = 0; | |
3400 | return 0; | |
3401 | } | |
3402 | ||
041c3194 ZW |
3403 | cur_token = &pfile->token_list.tokens[index - 1]; |
3404 | if (pcol) | |
3405 | *pcol = cur_token->col; | |
3406 | return cur_token->line; | |
3407 | } | |
3408 | ||
3409 | #define DSC(str) (const U_CHAR *)str, sizeof str - 1 | |
3410 | static const char * const monthnames[] = | |
3411 | { | |
3412 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
3413 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", | |
3414 | }; | |
3415 | ||
3416 | /* Handle builtin macros like __FILE__. */ | |
3417 | static const cpp_token * | |
3418 | special_symbol (pfile, node, token) | |
3419 | cpp_reader *pfile; | |
3420 | cpp_hashnode *node; | |
d1d9a6bd | 3421 | const cpp_token *token; |
3fef5b2b | 3422 | { |
041c3194 ZW |
3423 | cpp_token *result; |
3424 | cpp_buffer *ip; | |
3fef5b2b | 3425 | |
041c3194 | 3426 | switch (node->type) |
3fef5b2b | 3427 | { |
041c3194 ZW |
3428 | case T_FILE: |
3429 | case T_BASE_FILE: | |
3fef5b2b | 3430 | { |
041c3194 | 3431 | const char *file; |
3fef5b2b | 3432 | |
041c3194 ZW |
3433 | ip = CPP_BUFFER (pfile); |
3434 | if (ip == 0) | |
3435 | file = ""; | |
3fef5b2b | 3436 | else |
041c3194 ZW |
3437 | { |
3438 | if (node->type == T_BASE_FILE) | |
3439 | while (CPP_PREV_BUFFER (ip) != NULL) | |
3440 | ip = CPP_PREV_BUFFER (ip); | |
3441 | ||
3442 | file = ip->nominal_fname; | |
3443 | } | |
3444 | result = make_string_token (get_temp_token (pfile), (U_CHAR *) file, | |
3445 | strlen (file)); | |
3446 | } | |
3447 | break; | |
3fef5b2b | 3448 | |
041c3194 | 3449 | case T_INCLUDE_LEVEL: |
f9a0e96c ZW |
3450 | /* pfile->include_depth counts the primary source as level 1, |
3451 | but historically __INCLUDE_DEPTH__ has called the primary | |
3452 | source level 0. */ | |
3453 | result = alloc_number_token (pfile, pfile->include_depth - 1); | |
3fef5b2b NB |
3454 | break; |
3455 | ||
041c3194 ZW |
3456 | case T_SPECLINE: |
3457 | /* If __LINE__ is embedded in a macro, it must expand to the | |
3458 | line of the macro's invocation, not its definition. | |
3459 | Otherwise things like assert() will not work properly. */ | |
3460 | result = alloc_number_token (pfile, _cpp_get_line (pfile, NULL)); | |
5d7ee2fa NB |
3461 | break; |
3462 | ||
041c3194 | 3463 | case T_STDC: |
3fef5b2b | 3464 | { |
041c3194 | 3465 | int stdc = 1; |
3fef5b2b | 3466 | |
041c3194 ZW |
3467 | #ifdef STDC_0_IN_SYSTEM_HEADERS |
3468 | if (CPP_IN_SYSTEM_HEADER (pfile) | |
bfb9dc7f | 3469 | && pfile->spec_nodes->n__STRICT_ANSI__->type == T_VOID) |
041c3194 ZW |
3470 | stdc = 0; |
3471 | #endif | |
3472 | result = alloc_number_token (pfile, stdc); | |
3fef5b2b NB |
3473 | } |
3474 | break; | |
3475 | ||
041c3194 ZW |
3476 | case T_DATE: |
3477 | case T_TIME: | |
3478 | if (pfile->date == 0) | |
3479 | { | |
3480 | /* Allocate __DATE__ and __TIME__ from permanent storage, | |
3481 | and save them in pfile so we don't have to do this again. | |
3482 | We don't generate these strings at init time because | |
3483 | time() and localtime() are very slow on some systems. */ | |
3484 | time_t tt = time (NULL); | |
3485 | struct tm *tb = localtime (&tt); | |
3486 | ||
3487 | pfile->date = make_string_token | |
3488 | ((cpp_token *) xmalloc (sizeof (cpp_token)), DSC("Oct 11 1347")); | |
3489 | pfile->time = make_string_token | |
3490 | ((cpp_token *) xmalloc (sizeof (cpp_token)), DSC("12:34:56")); | |
3491 | ||
bfb9dc7f | 3492 | sprintf ((char *) pfile->date->val.str.text, "%s %2d %4d", |
041c3194 | 3493 | monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900); |
bfb9dc7f | 3494 | sprintf ((char *) pfile->time->val.str.text, "%02d:%02d:%02d", |
041c3194 ZW |
3495 | tb->tm_hour, tb->tm_min, tb->tm_sec); |
3496 | } | |
3497 | result = node->type == T_DATE ? pfile->date: pfile->time; | |
3fef5b2b NB |
3498 | break; |
3499 | ||
041c3194 | 3500 | case T_POISON: |
bfb9dc7f | 3501 | cpp_error (pfile, "attempt to use poisoned \"%s\"", node->name); |
041c3194 ZW |
3502 | return token; |
3503 | ||
3504 | default: | |
3505 | cpp_ice (pfile, "invalid special hash type"); | |
3506 | return token; | |
3fef5b2b NB |
3507 | } |
3508 | ||
041c3194 ZW |
3509 | ASSIGN_FLAGS_AND_POS (result, token); |
3510 | return result; | |
3511 | } | |
3512 | #undef DSC | |
3513 | ||
61d0346d | 3514 | /* Allocate pfile->input_buffer, and initialize _cpp_trigraph_map[] |
041c3194 ZW |
3515 | if it hasn't happened already. */ |
3516 | ||
3517 | void | |
3518 | _cpp_init_input_buffer (pfile) | |
3519 | cpp_reader *pfile; | |
3520 | { | |
417f3e3a ZW |
3521 | cpp_context *base; |
3522 | ||
417f3e3a ZW |
3523 | _cpp_init_toklist (&pfile->token_list, DUMMY_TOKEN); |
3524 | pfile->no_expand_level = UINT_MAX; | |
041c3194 | 3525 | pfile->context_cap = 20; |
041c3194 | 3526 | pfile->cur_context = 0; |
041c3194 | 3527 | |
417f3e3a ZW |
3528 | pfile->contexts = (cpp_context *) |
3529 | xmalloc (pfile->context_cap * sizeof (cpp_context)); | |
041c3194 | 3530 | |
417f3e3a ZW |
3531 | /* Clear the base context. */ |
3532 | base = &pfile->contexts[0]; | |
3533 | base->u.list = &pfile->token_list; | |
3534 | base->posn = 0; | |
3535 | base->count = 0; | |
3536 | base->args = 0; | |
3537 | base->level = 0; | |
3538 | base->flags = 0; | |
3539 | base->pushed_token = 0; | |
041c3194 ZW |
3540 | } |
3541 | ||
3542 | /* Moves to the end of the directive line, popping contexts as | |
3543 | necessary. */ | |
3544 | void | |
3545 | _cpp_skip_rest_of_line (pfile) | |
3546 | cpp_reader *pfile; | |
3547 | { | |
417f3e3a ZW |
3548 | /* Discard all stacked contexts. */ |
3549 | int i; | |
3550 | for (i = pfile->cur_context; i > 0; i--) | |
3551 | if (pfile->contexts[i].args) | |
3552 | free_macro_args (pfile->contexts[i].args); | |
3553 | ||
3554 | if (pfile->no_expand_level <= pfile->cur_context) | |
3555 | pfile->no_expand_level = 0; | |
3556 | pfile->cur_context = 0; | |
041c3194 | 3557 | |
417f3e3a ZW |
3558 | /* Clear the base context, and clear the directive pointer so that |
3559 | get_raw_token will advance to the next line. */ | |
3560 | pfile->contexts[0].count = 0; | |
3561 | pfile->contexts[0].posn = 0; | |
041c3194 | 3562 | pfile->token_list.directive = 0; |
c5a04734 ZW |
3563 | } |
3564 | ||
041c3194 ZW |
3565 | /* Directive handler wrapper used by the command line option |
3566 | processor. */ | |
3567 | void | |
2c8f0515 | 3568 | _cpp_run_directive (pfile, dir, buf, count, name) |
041c3194 ZW |
3569 | cpp_reader *pfile; |
3570 | const struct directive *dir; | |
3571 | const char *buf; | |
3572 | size_t count; | |
2c8f0515 | 3573 | const char *name; |
041c3194 ZW |
3574 | { |
3575 | if (cpp_push_buffer (pfile, (const U_CHAR *)buf, count) != NULL) | |
3576 | { | |
3577 | unsigned int prev_lvl = 0; | |
417f3e3a | 3578 | |
2c8f0515 ZW |
3579 | if (name) |
3580 | CPP_BUFFER (pfile)->nominal_fname = name; | |
3581 | else | |
3582 | CPP_BUFFER (pfile)->nominal_fname = _("<command line>"); | |
3583 | CPP_BUFFER (pfile)->lineno = (unsigned int)-1; | |
3584 | ||
417f3e3a ZW |
3585 | /* Scan the line now, else prevent_macro_expansion won't work. */ |
3586 | lex_next (pfile, 1); | |
041c3194 ZW |
3587 | if (! (dir->flags & EXPAND)) |
3588 | prev_lvl = prevent_macro_expansion (pfile); | |
3589 | ||
3590 | (void) (*dir->handler) (pfile); | |
3591 | ||
3592 | if (! (dir->flags & EXPAND)) | |
3593 | restore_macro_expansion (pfile, prev_lvl); | |
3594 | ||
3595 | _cpp_skip_rest_of_line (pfile); | |
3596 | cpp_pop_buffer (pfile); | |
3597 | } | |
3598 | } |