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45b966db ZW |
1 | /* CPP Library - lexical analysis. |
2 | Copyright (C) 2000 Free Software Foundation, Inc. | |
3 | Contributed by Per Bothner, 1994-95. | |
4 | Based on CCCP program by Paul Rubin, June 1986 | |
5 | Adapted to ANSI C, Richard Stallman, Jan 1987 | |
6 | Broken out to separate file, Zack Weinberg, Mar 2000 | |
c5a04734 | 7 | Single-pass line tokenization by Neil Booth, April 2000 |
45b966db ZW |
8 | |
9 | This program is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU General Public License as published by the | |
11 | Free Software Foundation; either version 2, or (at your option) any | |
12 | later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
22 | ||
041c3194 ZW |
23 | /* |
24 | ||
25 | Cleanups to do:- | |
26 | ||
041c3194 ZW |
27 | o Distinguish integers, floats, and 'other' pp-numbers. |
28 | o Store ints and char constants as binary values. | |
29 | o New command-line assertion syntax. | |
041c3194 ZW |
30 | o Comment all functions, and describe macro expansion algorithm. |
31 | o Move as much out of header files as possible. | |
32 | o Remove single quote pairs `', and some '', from diagnostics. | |
33 | o Correct pastability test for CPP_NAME and CPP_NUMBER. | |
34 | ||
35 | */ | |
36 | ||
45b966db ZW |
37 | #include "config.h" |
38 | #include "system.h" | |
39 | #include "intl.h" | |
40 | #include "cpplib.h" | |
41 | #include "cpphash.h" | |
041c3194 | 42 | #include "symcat.h" |
45b966db | 43 | |
7de4d004 NB |
44 | const unsigned char *_cpp_digraph_spellings [] = {U"%:", U"%:%:", U"<:", |
45 | U":>", U"<%", U"%>"}; | |
0d9f234d NB |
46 | static const cpp_token placemarker_token = {0, 0, CPP_PLACEMARKER, |
47 | 0 UNION_INIT_ZERO}; | |
f9a0e96c ZW |
48 | static const cpp_token eof_token = {0, 0, CPP_EOF, 0 UNION_INIT_ZERO}; |
49 | ||
50 | /* Flags for cpp_context. */ | |
51 | #define CONTEXT_PASTEL (1 << 0) /* An argument context on LHS of ##. */ | |
52 | #define CONTEXT_PASTER (1 << 1) /* An argument context on RHS of ##. */ | |
53 | #define CONTEXT_RAW (1 << 2) /* If argument tokens already expanded. */ | |
54 | #define CONTEXT_ARG (1 << 3) /* If an argument context. */ | |
a94c1199 | 55 | #define CONTEXT_VARARGS (1 << 4) /* If a varargs argument context. */ |
f9a0e96c ZW |
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 *)); | |
f2d5f0cc | 96 | |
0d9f234d NB |
97 | static cppchar_t handle_newline PARAMS ((cpp_buffer *, cppchar_t)); |
98 | static cppchar_t skip_escaped_newlines PARAMS ((cpp_buffer *, cppchar_t)); | |
99 | static cppchar_t get_effective_char PARAMS ((cpp_buffer *)); | |
100 | ||
041c3194 | 101 | static int skip_block_comment PARAMS ((cpp_reader *)); |
cbcff6df | 102 | static int skip_line_comment PARAMS ((cpp_reader *)); |
0d9f234d NB |
103 | static void adjust_column PARAMS ((cpp_reader *)); |
104 | static void skip_whitespace PARAMS ((cpp_reader *, cppchar_t)); | |
105 | static cpp_hashnode *parse_identifier PARAMS ((cpp_reader *, cppchar_t)); | |
106 | static void parse_number PARAMS ((cpp_reader *, cpp_string *, cppchar_t)); | |
107 | static void parse_string PARAMS ((cpp_reader *, cpp_token *, cppchar_t)); | |
108 | static void unterminated PARAMS ((cpp_reader *, unsigned int, int)); | |
109 | static int trigraph_ok PARAMS ((cpp_reader *, cppchar_t)); | |
110 | static void save_comment PARAMS ((cpp_reader *, cpp_token *, const U_CHAR *)); | |
cbcff6df NB |
111 | static void lex_percent PARAMS ((cpp_buffer *, cpp_token *)); |
112 | static void lex_dot PARAMS ((cpp_reader *, cpp_token *)); | |
041c3194 | 113 | static void lex_line PARAMS ((cpp_reader *, cpp_toklist *)); |
0d9f234d | 114 | static void lex_token PARAMS ((cpp_reader *, cpp_token *)); |
041c3194 | 115 | static int lex_next PARAMS ((cpp_reader *, int)); |
0d9f234d | 116 | |
041c3194 ZW |
117 | static int is_macro_disabled PARAMS ((cpp_reader *, const cpp_toklist *, |
118 | const cpp_token *)); | |
b8f41010 | 119 | |
041c3194 ZW |
120 | static cpp_token *stringify_arg PARAMS ((cpp_reader *, const cpp_token *)); |
121 | static void expand_context_stack PARAMS ((cpp_reader *)); | |
d1d9a6bd | 122 | static unsigned char * spell_token PARAMS ((cpp_reader *, const cpp_token *, |
041c3194 | 123 | unsigned char *)); |
b8f41010 NB |
124 | typedef unsigned int (* speller) PARAMS ((unsigned char *, cpp_toklist *, |
125 | cpp_token *)); | |
041c3194 ZW |
126 | static cpp_token *make_string_token PARAMS ((cpp_token *, const U_CHAR *, |
127 | unsigned int)); | |
128 | static cpp_token *alloc_number_token PARAMS ((cpp_reader *, int number)); | |
129 | static const cpp_token *special_symbol PARAMS ((cpp_reader *, cpp_hashnode *, | |
130 | const cpp_token *)); | |
131 | static cpp_token *duplicate_token PARAMS ((cpp_reader *, const cpp_token *)); | |
132 | static const cpp_token *maybe_paste_with_next PARAMS ((cpp_reader *, | |
133 | const cpp_token *)); | |
041c3194 ZW |
134 | static unsigned int prevent_macro_expansion PARAMS ((cpp_reader *)); |
135 | static void restore_macro_expansion PARAMS ((cpp_reader *, unsigned int)); | |
136 | static cpp_token *get_temp_token PARAMS ((cpp_reader *)); | |
137 | static void release_temp_tokens PARAMS ((cpp_reader *)); | |
138 | static U_CHAR * quote_string PARAMS ((U_CHAR *, const U_CHAR *, unsigned int)); | |
b8f41010 | 139 | |
041c3194 ZW |
140 | #define VALID_SIGN(c, prevc) \ |
141 | (((c) == '+' || (c) == '-') && \ | |
142 | ((prevc) == 'e' || (prevc) == 'E' \ | |
143 | || (((prevc) == 'p' || (prevc) == 'P') && !CPP_OPTION (pfile, c89)))) | |
144 | ||
f617b8e2 NB |
145 | /* An upper bound on the number of bytes needed to spell a token, |
146 | including preceding whitespace. */ | |
58fea6af ZW |
147 | static inline size_t TOKEN_LEN PARAMS ((const cpp_token *)); |
148 | static inline size_t | |
149 | TOKEN_LEN (token) | |
150 | const cpp_token *token; | |
151 | { | |
152 | size_t len; | |
153 | ||
154 | switch (TOKEN_SPELL (token)) | |
155 | { | |
156 | default: len = 0; break; | |
157 | case SPELL_STRING: len = token->val.str.len; break; | |
158 | case SPELL_IDENT: len = token->val.node->length; break; | |
159 | } | |
160 | return len + 5; | |
161 | } | |
f617b8e2 | 162 | |
f9a0e96c ZW |
163 | #define IS_ARG_CONTEXT(c) ((c)->flags & CONTEXT_ARG) |
164 | #define CURRENT_CONTEXT(pfile) ((pfile)->contexts + (pfile)->cur_context) | |
165 | ||
166 | #define ASSIGN_FLAGS_AND_POS(d, s) \ | |
167 | do {(d)->flags = (s)->flags & (PREV_WHITE | BOL | PASTE_LEFT); \ | |
168 | if ((d)->flags & BOL) {(d)->col = (s)->col; (d)->line = (s)->line;} \ | |
169 | } while (0) | |
170 | ||
171 | /* f is flags, just consisting of PREV_WHITE | BOL. */ | |
172 | #define MODIFY_FLAGS_AND_POS(d, s, f) \ | |
173 | do {(d)->flags &= ~(PREV_WHITE | BOL); (d)->flags |= (f); \ | |
174 | if ((f) & BOL) {(d)->col = (s)->col; (d)->line = (s)->line;} \ | |
175 | } while (0) | |
176 | ||
96be6998 ZW |
177 | #define OP(e, s) { SPELL_OPERATOR, U s }, |
178 | #define TK(e, s) { s, U STRINGX (e) }, | |
b8f41010 | 179 | |
041c3194 | 180 | const struct token_spelling |
96be6998 | 181 | _cpp_token_spellings [N_TTYPES] = {TTYPE_TABLE }; |
041c3194 | 182 | |
96be6998 ZW |
183 | #undef OP |
184 | #undef TK | |
b8f41010 | 185 | |
041c3194 ZW |
186 | /* Helper routine used by parse_include, which can't see spell_token. |
187 | Reinterpret the current line as an h-char-sequence (< ... >); we are | |
188 | looking at the first token after the <. */ | |
189 | const cpp_token * | |
190 | _cpp_glue_header_name (pfile) | |
45b966db ZW |
191 | cpp_reader *pfile; |
192 | { | |
041c3194 ZW |
193 | const cpp_token *t; |
194 | cpp_token *hdr; | |
58fea6af ZW |
195 | U_CHAR *buf, *p; |
196 | size_t len, avail; | |
197 | ||
198 | avail = 40; | |
199 | len = 0; | |
200 | buf = xmalloc (avail); | |
041c3194 ZW |
201 | |
202 | for (;;) | |
203 | { | |
417f3e3a | 204 | t = _cpp_get_token (pfile); |
041c3194 ZW |
205 | if (t->type == CPP_GREATER || t->type == CPP_EOF) |
206 | break; | |
207 | ||
58fea6af ZW |
208 | if (len + TOKEN_LEN (t) > avail) |
209 | { | |
210 | avail = len + TOKEN_LEN (t) + 40; | |
211 | buf = xrealloc (buf, avail); | |
212 | } | |
213 | ||
041c3194 | 214 | if (t->flags & PREV_WHITE) |
58fea6af ZW |
215 | buf[len++] = ' '; |
216 | ||
217 | p = spell_token (pfile, t, buf + len); | |
218 | len = (size_t) (p - buf); /* p known >= buf */ | |
041c3194 ZW |
219 | } |
220 | ||
221 | if (t->type == CPP_EOF) | |
222 | cpp_error (pfile, "missing terminating > character"); | |
45b966db | 223 | |
58fea6af | 224 | buf = xrealloc (buf, len); |
041c3194 ZW |
225 | |
226 | hdr = get_temp_token (pfile); | |
227 | hdr->type = CPP_HEADER_NAME; | |
228 | hdr->flags = 0; | |
bfb9dc7f ZW |
229 | hdr->val.str.text = buf; |
230 | hdr->val.str.len = len; | |
041c3194 | 231 | return hdr; |
45b966db ZW |
232 | } |
233 | ||
1368ee70 ZW |
234 | /* Token-buffer helper functions. */ |
235 | ||
d1d9a6bd NB |
236 | /* Expand a token list's string space. It is *vital* that |
237 | list->tokens_used is correct, to get pointer fix-up right. */ | |
041c3194 ZW |
238 | void |
239 | _cpp_expand_name_space (list, len) | |
1368ee70 | 240 | cpp_toklist *list; |
c5a04734 ZW |
241 | unsigned int len; |
242 | { | |
f617b8e2 | 243 | const U_CHAR *old_namebuf; |
f617b8e2 NB |
244 | |
245 | old_namebuf = list->namebuf; | |
c5a04734 ZW |
246 | list->name_cap += len; |
247 | list->namebuf = (unsigned char *) xrealloc (list->namebuf, list->name_cap); | |
f617b8e2 NB |
248 | |
249 | /* Fix up token text pointers. */ | |
79f50f2a | 250 | if (list->namebuf != old_namebuf) |
f617b8e2 NB |
251 | { |
252 | unsigned int i; | |
253 | ||
254 | for (i = 0; i < list->tokens_used; i++) | |
96be6998 | 255 | if (TOKEN_SPELL (&list->tokens[i]) == SPELL_STRING) |
bfb9dc7f | 256 | list->tokens[i].val.str.text += (list->namebuf - old_namebuf); |
f617b8e2 | 257 | } |
1368ee70 ZW |
258 | } |
259 | ||
041c3194 ZW |
260 | /* If there is not enough room for LEN more characters, expand the |
261 | list by just enough to have room for LEN characters. */ | |
262 | void | |
263 | _cpp_reserve_name_space (list, len) | |
264 | cpp_toklist *list; | |
265 | unsigned int len; | |
266 | { | |
267 | unsigned int room = list->name_cap - list->name_used; | |
268 | ||
269 | if (room < len) | |
270 | _cpp_expand_name_space (list, len - room); | |
271 | } | |
272 | ||
1368ee70 | 273 | /* Expand the number of tokens in a list. */ |
d1d9a6bd NB |
274 | void |
275 | _cpp_expand_token_space (list, count) | |
1368ee70 | 276 | cpp_toklist *list; |
d1d9a6bd | 277 | unsigned int count; |
1368ee70 | 278 | { |
d1d9a6bd | 279 | list->tokens_cap += count; |
1368ee70 | 280 | list->tokens = (cpp_token *) |
cbcff6df | 281 | xrealloc (list->tokens, list->tokens_cap * sizeof (cpp_token)); |
1368ee70 ZW |
282 | } |
283 | ||
cbcff6df NB |
284 | /* Initialize a token list. If EMPTY is false, some token and name |
285 | space is provided. */ | |
15dad1d9 | 286 | void |
cbcff6df | 287 | _cpp_init_toklist (list, empty) |
1368ee70 | 288 | cpp_toklist *list; |
cbcff6df | 289 | int empty; |
1368ee70 | 290 | { |
cbcff6df | 291 | if (empty) |
d1d9a6bd NB |
292 | { |
293 | list->tokens_cap = 0; | |
041c3194 | 294 | list->tokens = 0; |
d1d9a6bd | 295 | list->name_cap = 0; |
041c3194 | 296 | list->namebuf = 0; |
d1d9a6bd NB |
297 | } |
298 | else | |
299 | { | |
cbcff6df | 300 | /* Initialize token space. */ |
d1d9a6bd NB |
301 | list->tokens_cap = 256; /* 4K's worth. */ |
302 | list->tokens = (cpp_token *) | |
303 | xmalloc ((list->tokens_cap + 1) * sizeof (cpp_token)); | |
d1d9a6bd NB |
304 | |
305 | /* Initialize name space. */ | |
306 | list->name_cap = 1024; | |
041c3194 | 307 | list->namebuf = (unsigned char *) xmalloc (list->name_cap); |
d1d9a6bd | 308 | } |
15dad1d9 | 309 | |
15dad1d9 ZW |
310 | _cpp_clear_toklist (list); |
311 | } | |
1368ee70 | 312 | |
15dad1d9 ZW |
313 | /* Clear a token list. */ |
314 | void | |
315 | _cpp_clear_toklist (list) | |
316 | cpp_toklist *list; | |
317 | { | |
c5a04734 ZW |
318 | list->tokens_used = 0; |
319 | list->name_used = 0; | |
041c3194 ZW |
320 | list->directive = 0; |
321 | list->paramc = 0; | |
322 | list->params_len = 0; | |
cbcff6df | 323 | list->flags = 0; |
15dad1d9 ZW |
324 | } |
325 | ||
326 | /* Free a token list. Does not free the list itself, which may be | |
327 | embedded in a larger structure. */ | |
328 | void | |
329 | _cpp_free_toklist (list) | |
041c3194 | 330 | const cpp_toklist *list; |
15dad1d9 | 331 | { |
cbcff6df | 332 | free (list->tokens); |
15dad1d9 | 333 | free (list->namebuf); |
1368ee70 ZW |
334 | } |
335 | ||
15dad1d9 ZW |
336 | /* Compare two tokens. */ |
337 | int | |
338 | _cpp_equiv_tokens (a, b) | |
339 | const cpp_token *a, *b; | |
340 | { | |
041c3194 | 341 | if (a->type == b->type && a->flags == b->flags) |
96be6998 | 342 | switch (TOKEN_SPELL (a)) |
041c3194 ZW |
343 | { |
344 | default: /* Keep compiler happy. */ | |
345 | case SPELL_OPERATOR: | |
346 | return 1; | |
347 | case SPELL_CHAR: | |
348 | case SPELL_NONE: | |
349 | return a->val.aux == b->val.aux; /* arg_no or character. */ | |
350 | case SPELL_IDENT: | |
bfb9dc7f | 351 | return a->val.node == b->val.node; |
041c3194 | 352 | case SPELL_STRING: |
bfb9dc7f ZW |
353 | return (a->val.str.len == b->val.str.len |
354 | && !memcmp (a->val.str.text, b->val.str.text, | |
355 | a->val.str.len)); | |
041c3194 | 356 | } |
15dad1d9 | 357 | |
041c3194 | 358 | return 0; |
15dad1d9 ZW |
359 | } |
360 | ||
361 | /* Compare two token lists. */ | |
362 | int | |
363 | _cpp_equiv_toklists (a, b) | |
364 | const cpp_toklist *a, *b; | |
365 | { | |
366 | unsigned int i; | |
367 | ||
041c3194 ZW |
368 | if (a->tokens_used != b->tokens_used |
369 | || a->flags != b->flags | |
370 | || a->paramc != b->paramc) | |
15dad1d9 ZW |
371 | return 0; |
372 | ||
373 | for (i = 0; i < a->tokens_used; i++) | |
374 | if (! _cpp_equiv_tokens (&a->tokens[i], &b->tokens[i])) | |
375 | return 0; | |
376 | return 1; | |
377 | } | |
378 | ||
041c3194 | 379 | /* Utility routine: |
9e62c811 | 380 | |
bfb9dc7f ZW |
381 | Compares, the token TOKEN to the NUL-terminated string STRING. |
382 | TOKEN must be a CPP_NAME. Returns 1 for equal, 0 for unequal. */ | |
15dad1d9 | 383 | |
041c3194 | 384 | int |
bfb9dc7f ZW |
385 | cpp_ideq (token, string) |
386 | const cpp_token *token; | |
041c3194 ZW |
387 | const char *string; |
388 | { | |
bfb9dc7f | 389 | if (token->type != CPP_NAME) |
041c3194 | 390 | return 0; |
bfb9dc7f ZW |
391 | |
392 | return !ustrcmp (token->val.node->name, (const U_CHAR *)string); | |
15dad1d9 | 393 | } |
1368ee70 | 394 | |
0d9f234d NB |
395 | /* Call when meeting a newline. Returns the character after the newline |
396 | (or carriage-return newline combination), or EOF. */ | |
397 | static cppchar_t | |
398 | handle_newline (buffer, newline_char) | |
399 | cpp_buffer *buffer; | |
400 | cppchar_t newline_char; | |
401 | { | |
402 | cppchar_t next = EOF; | |
403 | ||
404 | buffer->col_adjust = 0; | |
405 | buffer->lineno++; | |
406 | buffer->line_base = buffer->cur; | |
407 | ||
408 | /* Handle CR-LF and LF-CR combinations, get the next character. */ | |
409 | if (buffer->cur < buffer->rlimit) | |
410 | { | |
411 | next = *buffer->cur++; | |
412 | if (next + newline_char == '\r' + '\n') | |
413 | { | |
414 | buffer->line_base = buffer->cur; | |
415 | if (buffer->cur < buffer->rlimit) | |
416 | next = *buffer->cur++; | |
417 | else | |
418 | next = EOF; | |
419 | } | |
420 | } | |
421 | ||
422 | buffer->read_ahead = next; | |
423 | return next; | |
424 | } | |
425 | ||
426 | /* Subroutine of skip_escaped_newlines; called when a trigraph is | |
427 | encountered. It warns if necessary, and returns true if the | |
428 | trigraph should be honoured. FROM_CHAR is the third character of a | |
429 | trigraph, and presumed to be the previous character for position | |
430 | reporting. */ | |
45b966db | 431 | static int |
0d9f234d | 432 | trigraph_ok (pfile, from_char) |
45b966db | 433 | cpp_reader *pfile; |
0d9f234d | 434 | cppchar_t from_char; |
45b966db | 435 | { |
041c3194 ZW |
436 | int accept = CPP_OPTION (pfile, trigraphs); |
437 | ||
cbcff6df NB |
438 | /* Don't warn about trigraphs in comments. */ |
439 | if (CPP_OPTION (pfile, warn_trigraphs) && !pfile->state.lexing_comment) | |
45b966db | 440 | { |
0d9f234d | 441 | cpp_buffer *buffer = pfile->buffer; |
041c3194 | 442 | if (accept) |
0d9f234d | 443 | cpp_warning_with_line (pfile, buffer->lineno, CPP_BUF_COL (buffer) - 2, |
041c3194 | 444 | "trigraph ??%c converted to %c", |
0d9f234d NB |
445 | (int) from_char, |
446 | (int) _cpp_trigraph_map[from_char]); | |
45b966db | 447 | else |
0d9f234d NB |
448 | cpp_warning_with_line (pfile, buffer->lineno, CPP_BUF_COL (buffer) - 2, |
449 | "trigraph ??%c ignored", (int) from_char); | |
45b966db | 450 | } |
0d9f234d | 451 | |
041c3194 | 452 | return accept; |
45b966db ZW |
453 | } |
454 | ||
0d9f234d NB |
455 | /* Assumes local variables buffer and result. */ |
456 | #define ACCEPT_CHAR(t) \ | |
457 | do { result->type = t; buffer->read_ahead = EOF; } while (0) | |
458 | ||
459 | /* When we move to multibyte character sets, add to these something | |
460 | that saves and restores the state of the multibyte conversion | |
461 | library. This probably involves saving and restoring a "cookie". | |
462 | In the case of glibc it is an 8-byte structure, so is not a high | |
463 | overhead operation. In any case, it's out of the fast path. */ | |
464 | #define SAVE_STATE() do { saved_cur = buffer->cur; } while (0) | |
465 | #define RESTORE_STATE() do { buffer->cur = saved_cur; } while (0) | |
466 | ||
467 | /* Skips any escaped newlines introduced by NEXT, which is either a | |
468 | '?' or a '\\'. Returns the next character, which will also have | |
469 | been placed in buffer->read_ahead. */ | |
470 | static cppchar_t | |
471 | skip_escaped_newlines (buffer, next) | |
472 | cpp_buffer *buffer; | |
473 | cppchar_t next; | |
45b966db | 474 | { |
0d9f234d NB |
475 | cppchar_t next1; |
476 | const unsigned char *saved_cur; | |
477 | int space; | |
041c3194 | 478 | |
0d9f234d | 479 | do |
041c3194 | 480 | { |
0d9f234d NB |
481 | if (buffer->cur == buffer->rlimit) |
482 | break; | |
483 | ||
484 | SAVE_STATE (); | |
485 | if (next == '?') | |
486 | { | |
487 | next1 = *buffer->cur++; | |
488 | if (next1 != '?' || buffer->cur == buffer->rlimit) | |
489 | { | |
490 | RESTORE_STATE (); | |
491 | break; | |
492 | } | |
041c3194 | 493 | |
0d9f234d NB |
494 | next1 = *buffer->cur++; |
495 | if (!_cpp_trigraph_map[next1] || !trigraph_ok (buffer->pfile, next1)) | |
496 | { | |
497 | RESTORE_STATE (); | |
498 | break; | |
499 | } | |
45b966db | 500 | |
0d9f234d NB |
501 | /* We have a full trigraph here. */ |
502 | next = _cpp_trigraph_map[next1]; | |
503 | if (next != '\\' || buffer->cur == buffer->rlimit) | |
504 | break; | |
505 | SAVE_STATE (); | |
506 | } | |
507 | ||
508 | /* We have a backslash, and room for at least one more character. */ | |
509 | space = 0; | |
510 | do | |
511 | { | |
512 | next1 = *buffer->cur++; | |
513 | if (!is_nvspace (next1)) | |
514 | break; | |
515 | space = 1; | |
516 | } | |
517 | while (buffer->cur < buffer->rlimit); | |
518 | ||
519 | if (!is_vspace (next1)) | |
520 | { | |
521 | RESTORE_STATE (); | |
522 | break; | |
523 | } | |
45b966db | 524 | |
0d9f234d NB |
525 | if (space) |
526 | cpp_warning (buffer->pfile, | |
527 | "backslash and newline separated by space"); | |
528 | ||
529 | next = handle_newline (buffer, next1); | |
530 | if (next == EOF) | |
531 | cpp_pedwarn (buffer->pfile, "backslash-newline at end of file"); | |
041c3194 | 532 | } |
0d9f234d | 533 | while (next == '\\' || next == '?'); |
45b966db | 534 | |
0d9f234d NB |
535 | buffer->read_ahead = next; |
536 | return next; | |
45b966db ZW |
537 | } |
538 | ||
0d9f234d NB |
539 | /* Obtain the next character, after trigraph conversion and skipping |
540 | an arbitrary string of escaped newlines. The common case of no | |
541 | trigraphs or escaped newlines falls through quickly. */ | |
542 | static cppchar_t | |
543 | get_effective_char (buffer) | |
544 | cpp_buffer *buffer; | |
64aaf407 | 545 | { |
0d9f234d NB |
546 | cppchar_t next = EOF; |
547 | ||
548 | if (buffer->cur < buffer->rlimit) | |
549 | { | |
550 | next = *buffer->cur++; | |
551 | ||
552 | /* '?' can introduce trigraphs (and therefore backslash); '\\' | |
553 | can introduce escaped newlines, which we want to skip, or | |
554 | UCNs, which, depending upon lexer state, we will handle in | |
555 | the future. */ | |
556 | if (next == '?' || next == '\\') | |
557 | next = skip_escaped_newlines (buffer, next); | |
558 | } | |
559 | ||
560 | buffer->read_ahead = next; | |
561 | return next; | |
64aaf407 NB |
562 | } |
563 | ||
0d9f234d NB |
564 | /* Skip a C-style block comment. We find the end of the comment by |
565 | seeing if an asterisk is before every '/' we encounter. Returns | |
566 | non-zero if comment terminated by EOF, zero otherwise. */ | |
041c3194 ZW |
567 | static int |
568 | skip_block_comment (pfile) | |
45b966db ZW |
569 | cpp_reader *pfile; |
570 | { | |
041c3194 | 571 | cpp_buffer *buffer = pfile->buffer; |
d8090680 | 572 | cppchar_t c = EOF, prevc = EOF; |
0d9f234d | 573 | |
cbcff6df | 574 | pfile->state.lexing_comment = 1; |
0d9f234d | 575 | while (buffer->cur != buffer->rlimit) |
45b966db | 576 | { |
0d9f234d NB |
577 | prevc = c, c = *buffer->cur++; |
578 | ||
579 | next_char: | |
580 | /* FIXME: For speed, create a new character class of characters | |
581 | of no interest inside block comments. */ | |
582 | if (c == '?' || c == '\\') | |
583 | c = skip_escaped_newlines (buffer, c); | |
041c3194 | 584 | |
0d9f234d NB |
585 | /* People like decorating comments with '*', so check for '/' |
586 | instead for efficiency. */ | |
041c3194 | 587 | if (c == '/') |
45b966db | 588 | { |
0d9f234d NB |
589 | if (prevc == '*') |
590 | break; | |
041c3194 | 591 | |
0d9f234d NB |
592 | /* Warn about potential nested comments, but not if the '/' |
593 | comes immediately before the true comment delimeter. | |
041c3194 | 594 | Don't bother to get it right across escaped newlines. */ |
0d9f234d NB |
595 | if (CPP_OPTION (pfile, warn_comments) |
596 | && buffer->cur != buffer->rlimit) | |
45b966db | 597 | { |
0d9f234d NB |
598 | prevc = c, c = *buffer->cur++; |
599 | if (c == '*' && buffer->cur != buffer->rlimit) | |
600 | { | |
601 | prevc = c, c = *buffer->cur++; | |
602 | if (c != '/') | |
603 | cpp_warning_with_line (pfile, CPP_BUF_LINE (buffer), | |
604 | CPP_BUF_COL (buffer), | |
605 | "\"/*\" within comment"); | |
606 | } | |
607 | goto next_char; | |
45b966db | 608 | } |
45b966db | 609 | } |
91fcd158 | 610 | else if (is_vspace (c)) |
45b966db | 611 | { |
0d9f234d NB |
612 | prevc = c, c = handle_newline (buffer, c); |
613 | goto next_char; | |
45b966db | 614 | } |
52fadca8 | 615 | else if (c == '\t') |
0d9f234d | 616 | adjust_column (pfile); |
45b966db | 617 | } |
041c3194 | 618 | |
cbcff6df | 619 | pfile->state.lexing_comment = 0; |
0d9f234d NB |
620 | buffer->read_ahead = EOF; |
621 | return c != '/' || prevc != '*'; | |
45b966db ZW |
622 | } |
623 | ||
f9a0e96c | 624 | /* Skip a C++ line comment. Handles escaped newlines. Returns |
0d9f234d NB |
625 | non-zero if a multiline comment. The following new line, if any, |
626 | is left in buffer->read_ahead. */ | |
041c3194 | 627 | static int |
cbcff6df NB |
628 | skip_line_comment (pfile) |
629 | cpp_reader *pfile; | |
45b966db | 630 | { |
cbcff6df | 631 | cpp_buffer *buffer = pfile->buffer; |
0d9f234d NB |
632 | unsigned int orig_lineno = buffer->lineno; |
633 | cppchar_t c; | |
041c3194 | 634 | |
cbcff6df | 635 | pfile->state.lexing_comment = 1; |
0d9f234d | 636 | do |
041c3194 | 637 | { |
0d9f234d NB |
638 | c = EOF; |
639 | if (buffer->cur == buffer->rlimit) | |
640 | break; | |
041c3194 | 641 | |
0d9f234d NB |
642 | c = *buffer->cur++; |
643 | if (c == '?' || c == '\\') | |
644 | c = skip_escaped_newlines (buffer, c); | |
041c3194 | 645 | } |
0d9f234d | 646 | while (!is_vspace (c)); |
45b966db | 647 | |
cbcff6df | 648 | pfile->state.lexing_comment = 0; |
0d9f234d NB |
649 | buffer->read_ahead = c; /* Leave any newline for caller. */ |
650 | return orig_lineno != buffer->lineno; | |
041c3194 | 651 | } |
45b966db | 652 | |
0d9f234d NB |
653 | /* pfile->buffer->cur is one beyond the \t character. Update |
654 | col_adjust so we track the column correctly. */ | |
52fadca8 | 655 | static void |
0d9f234d | 656 | adjust_column (pfile) |
52fadca8 | 657 | cpp_reader *pfile; |
52fadca8 | 658 | { |
0d9f234d NB |
659 | cpp_buffer *buffer = pfile->buffer; |
660 | unsigned int col = CPP_BUF_COL (buffer) - 1; /* Zero-based column. */ | |
52fadca8 NB |
661 | |
662 | /* Round it up to multiple of the tabstop, but subtract 1 since the | |
663 | tab itself occupies a character position. */ | |
0d9f234d NB |
664 | buffer->col_adjust += (CPP_OPTION (pfile, tabstop) |
665 | - col % CPP_OPTION (pfile, tabstop)) - 1; | |
52fadca8 NB |
666 | } |
667 | ||
0d9f234d NB |
668 | /* Skips whitespace, saving the next non-whitespace character. |
669 | Adjusts pfile->col_adjust to account for tabs. Without this, | |
670 | tokens might be assigned an incorrect column. */ | |
041c3194 | 671 | static void |
0d9f234d | 672 | skip_whitespace (pfile, c) |
041c3194 | 673 | cpp_reader *pfile; |
0d9f234d | 674 | cppchar_t c; |
041c3194 ZW |
675 | { |
676 | cpp_buffer *buffer = pfile->buffer; | |
0d9f234d | 677 | unsigned int warned = 0; |
45b966db | 678 | |
0d9f234d | 679 | do |
041c3194 | 680 | { |
91fcd158 NB |
681 | /* Horizontal space always OK. */ |
682 | if (c == ' ') | |
0d9f234d | 683 | ; |
91fcd158 | 684 | else if (c == '\t') |
0d9f234d NB |
685 | adjust_column (pfile); |
686 | /* Just \f \v or \0 left. */ | |
91fcd158 | 687 | else if (c == '\0') |
041c3194 | 688 | { |
91fcd158 | 689 | if (!warned) |
0d9f234d NB |
690 | { |
691 | cpp_warning (pfile, "null character(s) ignored"); | |
692 | warned = 1; | |
693 | } | |
45b966db | 694 | } |
0d9f234d | 695 | else if (IN_DIRECTIVE (pfile) && CPP_PEDANTIC (pfile)) |
91fcd158 NB |
696 | cpp_pedwarn_with_line (pfile, CPP_BUF_LINE (buffer), |
697 | CPP_BUF_COL (buffer), | |
698 | "%s in preprocessing directive", | |
699 | c == '\f' ? "form feed" : "vertical tab"); | |
0d9f234d NB |
700 | |
701 | c = EOF; | |
702 | if (buffer->cur == buffer->rlimit) | |
703 | break; | |
704 | c = *buffer->cur++; | |
45b966db | 705 | } |
0d9f234d NB |
706 | /* We only want non-vertical space, i.e. ' ' \t \f \v \0. */ |
707 | while (is_nvspace (c)); | |
708 | ||
709 | /* Remember the next character. */ | |
710 | buffer->read_ahead = c; | |
041c3194 | 711 | } |
45b966db | 712 | |
0d9f234d NB |
713 | /* Parse an identifier, skipping embedded backslash-newlines. |
714 | Calculate the hash value of the token while parsing, for improved | |
715 | performance. The hashing algorithm *must* match cpp_lookup(). */ | |
716 | ||
717 | static cpp_hashnode * | |
718 | parse_identifier (pfile, c) | |
45b966db | 719 | cpp_reader *pfile; |
0d9f234d | 720 | cppchar_t c; |
45b966db | 721 | { |
0d9f234d NB |
722 | cpp_buffer *buffer = pfile->buffer; |
723 | unsigned int r = 0, saw_dollar = 0; | |
724 | unsigned int orig_used = pfile->token_list.name_used; | |
041c3194 | 725 | |
0d9f234d | 726 | do |
041c3194 | 727 | { |
0d9f234d | 728 | do |
041c3194 | 729 | { |
0d9f234d NB |
730 | if (pfile->token_list.name_used == pfile->token_list.name_cap) |
731 | _cpp_expand_name_space (&pfile->token_list, | |
732 | pfile->token_list.name_used + 256); | |
733 | pfile->token_list.namebuf[pfile->token_list.name_used++] = c; | |
734 | r = HASHSTEP (r, c); | |
45b966db | 735 | |
0d9f234d NB |
736 | if (c == '$') |
737 | saw_dollar++; | |
ba89d661 | 738 | |
0d9f234d NB |
739 | c = EOF; |
740 | if (buffer->cur == buffer->rlimit) | |
741 | break; | |
ba89d661 | 742 | |
0d9f234d NB |
743 | c = *buffer->cur++; |
744 | } | |
745 | while (is_idchar (c)); | |
ba89d661 | 746 | |
0d9f234d NB |
747 | /* Potential escaped newline? */ |
748 | if (c != '?' && c != '\\') | |
749 | break; | |
750 | c = skip_escaped_newlines (buffer, c); | |
041c3194 | 751 | } |
0d9f234d NB |
752 | while (is_idchar (c)); |
753 | ||
754 | /* $ is not a identifier character in the standard, but is commonly | |
755 | accepted as an extension. Don't warn about it in skipped | |
756 | conditional blocks. */ | |
757 | if (saw_dollar && CPP_PEDANTIC (pfile) && ! pfile->skipping) | |
758 | cpp_pedwarn (pfile, "'$' character(s) in identifier"); | |
759 | ||
760 | /* Remember the next character. */ | |
761 | buffer->read_ahead = c; | |
762 | return _cpp_lookup_with_hash (pfile, &pfile->token_list.namebuf[orig_used], | |
763 | pfile->token_list.name_used - orig_used, r); | |
45b966db ZW |
764 | } |
765 | ||
0d9f234d | 766 | /* Parse a number, skipping embedded backslash-newlines. */ |
45b966db | 767 | static void |
0d9f234d | 768 | parse_number (pfile, number, c) |
45b966db | 769 | cpp_reader *pfile; |
0d9f234d NB |
770 | cpp_string *number; |
771 | cppchar_t c; | |
45b966db | 772 | { |
0d9f234d | 773 | cppchar_t prevc; |
041c3194 | 774 | cpp_buffer *buffer = pfile->buffer; |
0d9f234d | 775 | unsigned int orig_used = pfile->token_list.name_used; |
45b966db | 776 | |
cbcff6df NB |
777 | /* Reserve space for a leading period. */ |
778 | if (pfile->state.seen_dot) | |
779 | pfile->token_list.name_used++; | |
780 | ||
0d9f234d | 781 | do |
041c3194 | 782 | { |
0d9f234d NB |
783 | do |
784 | { | |
cbcff6df | 785 | if (pfile->token_list.name_used >= pfile->token_list.name_cap) |
0d9f234d NB |
786 | _cpp_expand_name_space (&pfile->token_list, |
787 | pfile->token_list.name_used + 256); | |
788 | pfile->token_list.namebuf[pfile->token_list.name_used++] = c; | |
789 | ||
790 | prevc = c; | |
791 | c = EOF; | |
792 | if (buffer->cur == buffer->rlimit) | |
793 | break; | |
45b966db | 794 | |
0d9f234d NB |
795 | c = *buffer->cur++; |
796 | } | |
797 | while (is_numchar (c) || c == '.' || VALID_SIGN (c, prevc)); | |
45b966db | 798 | |
0d9f234d NB |
799 | /* Potential escaped newline? */ |
800 | if (c != '?' && c != '\\') | |
801 | break; | |
802 | c = skip_escaped_newlines (buffer, c); | |
45b966db | 803 | } |
0d9f234d NB |
804 | while (is_numchar (c) || c == '.' || VALID_SIGN (c, prevc)); |
805 | ||
cbcff6df NB |
806 | /* Put any leading period in place, now we have the room. */ |
807 | if (pfile->state.seen_dot) | |
808 | pfile->token_list.namebuf[orig_used] = '.'; | |
809 | ||
0d9f234d NB |
810 | /* Remember the next character. */ |
811 | buffer->read_ahead = c; | |
64aaf407 | 812 | |
0d9f234d NB |
813 | number->text = &pfile->token_list.namebuf[orig_used]; |
814 | number->len = pfile->token_list.name_used - orig_used; | |
815 | } | |
816 | ||
817 | /* Subroutine of parse_string. Emits error for unterminated strings. */ | |
818 | static void | |
819 | unterminated (pfile, line, term) | |
820 | cpp_reader *pfile; | |
821 | unsigned int line; | |
822 | int term; | |
823 | { | |
824 | cpp_error (pfile, "missing terminating %c character", term); | |
825 | ||
826 | if (term == '\"' && pfile->mls_line && pfile->mls_line != line) | |
041c3194 | 827 | { |
0d9f234d NB |
828 | cpp_error_with_line (pfile, pfile->mls_line, pfile->mls_column, |
829 | "possible start of unterminated string literal"); | |
830 | pfile->mls_line = 0; | |
041c3194 | 831 | } |
45b966db ZW |
832 | } |
833 | ||
0d9f234d NB |
834 | /* Parses a string, character constant, or angle-bracketed header file |
835 | name. Handles embedded trigraphs and escaped newlines. | |
45b966db | 836 | |
0d9f234d NB |
837 | Multi-line strings are allowed, but they are deprecated within |
838 | directives. */ | |
041c3194 | 839 | static void |
0d9f234d | 840 | parse_string (pfile, token, terminator) |
45b966db | 841 | cpp_reader *pfile; |
041c3194 | 842 | cpp_token *token; |
0d9f234d | 843 | cppchar_t terminator; |
45b966db | 844 | { |
041c3194 | 845 | cpp_buffer *buffer = pfile->buffer; |
0d9f234d NB |
846 | unsigned int orig_used = pfile->token_list.name_used; |
847 | cppchar_t c; | |
848 | unsigned int nulls = 0; | |
849 | ||
850 | for (;;) | |
45b966db | 851 | { |
0d9f234d NB |
852 | if (buffer->cur == buffer->rlimit) |
853 | { | |
854 | c = EOF; | |
855 | unterminated (pfile, token->line, terminator); | |
856 | break; | |
857 | } | |
858 | c = *buffer->cur++; | |
859 | ||
860 | have_char: | |
861 | /* Handle trigraphs, escaped newlines etc. */ | |
862 | if (c == '?' || c == '\\') | |
863 | c = skip_escaped_newlines (buffer, c); | |
45b966db | 864 | |
0d9f234d | 865 | if (c == terminator) |
45b966db | 866 | { |
0d9f234d | 867 | unsigned int u = pfile->token_list.name_used; |
5eec0563 | 868 | |
0d9f234d NB |
869 | /* An odd number of consecutive backslashes represents an |
870 | escaped terminator. */ | |
871 | while (u > orig_used && pfile->token_list.namebuf[u - 1] == '\\') | |
872 | u--; | |
873 | ||
874 | if ((pfile->token_list.name_used - u) % 2 == 0) | |
45b966db | 875 | { |
0d9f234d NB |
876 | c = EOF; |
877 | break; | |
45b966db | 878 | } |
0d9f234d NB |
879 | } |
880 | else if (is_vspace (c)) | |
881 | { | |
882 | /* In assembly language, silently terminate string and | |
883 | character literals at end of line. This is a kludge | |
884 | around not knowing where comments are. */ | |
885 | if (CPP_OPTION (pfile, lang_asm) && terminator != '>') | |
886 | break; | |
45b966db | 887 | |
0d9f234d NB |
888 | /* Character constants and header names may not extend over |
889 | multiple lines. In Standard C, neither may strings. | |
890 | Unfortunately, we accept multiline strings as an | |
891 | extension. (Deprecatedly even in directives - otherwise, | |
892 | glibc's longlong.h breaks.) */ | |
893 | if (terminator != '"') | |
45b966db | 894 | { |
0d9f234d NB |
895 | unterminated (pfile, token->line, terminator); |
896 | break; | |
45b966db | 897 | } |
45b966db | 898 | |
0d9f234d NB |
899 | if (pfile->mls_line == 0) |
900 | { | |
901 | pfile->mls_line = token->line; | |
902 | pfile->mls_column = token->col; | |
903 | if (CPP_PEDANTIC (pfile)) | |
904 | cpp_pedwarn (pfile, "multi-line string constant"); | |
041c3194 | 905 | } |
0d9f234d NB |
906 | |
907 | handle_newline (buffer, c); /* Stores to read_ahead. */ | |
908 | c = '\n'; | |
909 | } | |
910 | else if (c == '\0') | |
911 | { | |
912 | if (nulls++ == 0) | |
913 | cpp_warning (pfile, "null character(s) preserved in literal"); | |
45b966db | 914 | } |
45b966db | 915 | |
0d9f234d NB |
916 | if (pfile->token_list.name_used == pfile->token_list.name_cap) |
917 | _cpp_expand_name_space (&pfile->token_list, | |
918 | pfile->token_list.name_used + 256); | |
476f2869 | 919 | |
0d9f234d NB |
920 | pfile->token_list.namebuf[pfile->token_list.name_used++] = c; |
921 | /* If we had a new line, the next character is in read_ahead. */ | |
922 | if (c != '\n') | |
923 | continue; | |
924 | c = buffer->read_ahead; | |
925 | if (c != EOF) | |
926 | goto have_char; | |
45b966db ZW |
927 | } |
928 | ||
0d9f234d | 929 | buffer->read_ahead = c; |
45b966db | 930 | |
0d9f234d NB |
931 | token->val.str.text = &pfile->token_list.namebuf[orig_used]; |
932 | token->val.str.len = pfile->token_list.name_used - orig_used; | |
933 | } | |
041c3194 | 934 | |
0d9f234d NB |
935 | /* For output routine simplicity, the stored comment includes the |
936 | comment start and any terminator. */ | |
9e62c811 | 937 | static void |
0d9f234d NB |
938 | save_comment (pfile, token, from) |
939 | cpp_reader *pfile; | |
041c3194 ZW |
940 | cpp_token *token; |
941 | const unsigned char *from; | |
9e62c811 | 942 | { |
041c3194 | 943 | unsigned char *buffer; |
0d9f234d NB |
944 | unsigned int len; |
945 | cpp_toklist *list = &pfile->token_list; | |
946 | ||
1c6d33ef | 947 | len = pfile->buffer->cur - from + 1; /* + 1 for the initial '/'. */ |
0d9f234d NB |
948 | _cpp_reserve_name_space (list, len); |
949 | buffer = list->namebuf + list->name_used; | |
950 | list->name_used += len; | |
041c3194 | 951 | |
041c3194 | 952 | token->type = CPP_COMMENT; |
bfb9dc7f | 953 | token->val.str.len = len; |
0d9f234d | 954 | token->val.str.text = buffer; |
45b966db | 955 | |
1c6d33ef NB |
956 | buffer[0] = '/'; |
957 | memcpy (buffer + 1, from, len - 1); | |
0d9f234d | 958 | } |
45b966db | 959 | |
cbcff6df NB |
960 | /* Subroutine of lex_token to handle '%'. A little tricky, since we |
961 | want to avoid stepping back when lexing %:%X. */ | |
0d9f234d | 962 | static void |
cbcff6df | 963 | lex_percent (buffer, result) |
0d9f234d NB |
964 | cpp_buffer *buffer; |
965 | cpp_token *result; | |
0d9f234d | 966 | { |
cbcff6df NB |
967 | cppchar_t c; |
968 | ||
969 | result->type = CPP_MOD; | |
970 | /* Parsing %:%X could leave an extra character. */ | |
971 | if (buffer->extra_char == EOF) | |
972 | c = get_effective_char (buffer); | |
973 | else | |
974 | { | |
975 | c = buffer->read_ahead = buffer->extra_char; | |
976 | buffer->extra_char = EOF; | |
977 | } | |
978 | ||
979 | if (c == '=') | |
980 | ACCEPT_CHAR (CPP_MOD_EQ); | |
981 | else if (CPP_OPTION (buffer->pfile, digraphs)) | |
982 | { | |
983 | if (c == ':') | |
984 | { | |
985 | result->flags |= DIGRAPH; | |
986 | ACCEPT_CHAR (CPP_HASH); | |
987 | if (get_effective_char (buffer) == '%') | |
988 | { | |
989 | buffer->extra_char = get_effective_char (buffer); | |
990 | if (buffer->extra_char == ':') | |
991 | { | |
992 | buffer->extra_char = EOF; | |
993 | ACCEPT_CHAR (CPP_PASTE); | |
994 | } | |
995 | else | |
996 | /* We'll catch the extra_char when we're called back. */ | |
997 | buffer->read_ahead = '%'; | |
998 | } | |
999 | } | |
1000 | else if (c == '>') | |
1001 | { | |
1002 | result->flags |= DIGRAPH; | |
1003 | ACCEPT_CHAR (CPP_CLOSE_BRACE); | |
1004 | } | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | /* Subroutine of lex_token to handle '.'. This is tricky, since we | |
1009 | want to avoid stepping back when lexing '...' or '.123'. In the | |
1010 | latter case we should also set a flag for parse_number. */ | |
1011 | static void | |
1012 | lex_dot (pfile, result) | |
1013 | cpp_reader *pfile; | |
1014 | cpp_token *result; | |
1015 | { | |
1016 | cpp_buffer *buffer = pfile->buffer; | |
1017 | cppchar_t c; | |
1018 | ||
1019 | /* Parsing ..X could leave an extra character. */ | |
1020 | if (buffer->extra_char == EOF) | |
1021 | c = get_effective_char (buffer); | |
1022 | else | |
1023 | { | |
1024 | c = buffer->read_ahead = buffer->extra_char; | |
1025 | buffer->extra_char = EOF; | |
1026 | } | |
0d9f234d | 1027 | |
cbcff6df NB |
1028 | /* All known character sets have 0...9 contiguous. */ |
1029 | if (c >= '0' && c <= '9') | |
1030 | { | |
1031 | result->type = CPP_NUMBER; | |
1032 | buffer->pfile->state.seen_dot = 1; | |
1033 | parse_number (pfile, &result->val.str, c); | |
1034 | buffer->pfile->state.seen_dot = 0; | |
1035 | } | |
041c3194 | 1036 | else |
ea4a453b | 1037 | { |
cbcff6df NB |
1038 | result->type = CPP_DOT; |
1039 | if (c == '.') | |
1040 | { | |
1041 | buffer->extra_char = get_effective_char (buffer); | |
1042 | if (buffer->extra_char == '.') | |
1043 | { | |
1044 | buffer->extra_char = EOF; | |
1045 | ACCEPT_CHAR (CPP_ELLIPSIS); | |
1046 | } | |
1047 | else | |
1048 | /* We'll catch the extra_char when we're called back. */ | |
1049 | buffer->read_ahead = '.'; | |
1050 | } | |
1051 | else if (c == '*' && CPP_OPTION (pfile, cplusplus)) | |
1052 | ACCEPT_CHAR (CPP_DOT_STAR); | |
ea4a453b | 1053 | } |
45b966db ZW |
1054 | } |
1055 | ||
041c3194 | 1056 | static void |
0d9f234d | 1057 | lex_token (pfile, result) |
45b966db | 1058 | cpp_reader *pfile; |
0d9f234d | 1059 | cpp_token *result; |
45b966db | 1060 | { |
0d9f234d | 1061 | cppchar_t c; |
041c3194 | 1062 | cpp_buffer *buffer = pfile->buffer; |
0d9f234d | 1063 | const unsigned char *comment_start; |
9ec7291f | 1064 | |
0d9f234d NB |
1065 | result->flags = 0; |
1066 | next_char: | |
1067 | result->line = CPP_BUF_LINE (buffer); | |
1068 | next_char2: | |
1069 | result->col = CPP_BUF_COLUMN (buffer, buffer->cur); | |
041c3194 | 1070 | |
0d9f234d NB |
1071 | c = buffer->read_ahead; |
1072 | if (c == EOF && buffer->cur < buffer->rlimit) | |
1073 | { | |
1074 | c = *buffer->cur++; | |
1075 | result->col++; | |
1076 | } | |
45b966db | 1077 | |
0d9f234d NB |
1078 | do_switch: |
1079 | buffer->read_ahead = EOF; | |
1080 | switch (c) | |
45b966db | 1081 | { |
0d9f234d NB |
1082 | case EOF: |
1083 | /* Non-empty files should end in a newline. Testing | |
1084 | skip_newlines ensures we only emit the warning once. */ | |
1085 | if (buffer->cur != buffer->line_base && buffer->cur != buffer->buf | |
1086 | && pfile->state.skip_newlines) | |
1087 | cpp_pedwarn_with_line (pfile, buffer->lineno, CPP_BUF_COL (buffer), | |
1088 | "no newline at end of file"); | |
1089 | result->type = CPP_EOF; | |
1090 | break; | |
45b966db | 1091 | |
0d9f234d NB |
1092 | case ' ': case '\t': case '\f': case '\v': case '\0': |
1093 | skip_whitespace (pfile, c); | |
1094 | result->flags |= PREV_WHITE; | |
1095 | goto next_char2; | |
1096 | ||
1097 | case '\n': case '\r': | |
1098 | result->type = CPP_EOF; | |
1099 | handle_newline (buffer, c); | |
1100 | /* Handling here will change significantly when moving to | |
1101 | token-at-a-time. */ | |
1102 | if (pfile->state.skip_newlines) | |
45b966db | 1103 | { |
0d9f234d NB |
1104 | result->flags &= ~PREV_WHITE; /* Clear any whitespace flag. */ |
1105 | goto next_char; | |
45b966db | 1106 | } |
0d9f234d | 1107 | break; |
46d07497 | 1108 | |
0d9f234d NB |
1109 | case '?': |
1110 | case '\\': | |
1111 | /* These could start an escaped newline, or '?' a trigraph. Let | |
1112 | skip_escaped_newlines do all the work. */ | |
1113 | { | |
1114 | unsigned int lineno = buffer->lineno; | |
1115 | ||
1116 | c = skip_escaped_newlines (buffer, c); | |
1117 | if (lineno != buffer->lineno) | |
1118 | /* We had at least one escaped newline of some sort, and the | |
1119 | next character is in buffer->read_ahead. Update the | |
1120 | token's line and column. */ | |
1121 | goto next_char; | |
1122 | ||
1123 | /* We are either the original '?' or '\\', or a trigraph. */ | |
1124 | result->type = CPP_QUERY; | |
1125 | buffer->read_ahead = EOF; | |
1126 | if (c == '\\') | |
1127 | result->type = CPP_BACKSLASH; | |
1128 | else if (c != '?') | |
1129 | goto do_switch; | |
1130 | } | |
1131 | break; | |
46d07497 | 1132 | |
0d9f234d NB |
1133 | case '0': case '1': case '2': case '3': case '4': |
1134 | case '5': case '6': case '7': case '8': case '9': | |
1135 | result->type = CPP_NUMBER; | |
1136 | parse_number (pfile, &result->val.str, c); | |
1137 | break; | |
46d07497 | 1138 | |
0d9f234d NB |
1139 | case '$': |
1140 | if (!CPP_OPTION (pfile, dollars_in_ident)) | |
1141 | goto random_char; | |
1142 | /* Fall through... */ | |
1143 | ||
1144 | case '_': | |
1145 | case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': | |
1146 | case 'g': case 'h': case 'i': case 'j': case 'k': case 'l': | |
1147 | case 'm': case 'n': case 'o': case 'p': case 'q': case 'r': | |
1148 | case 's': case 't': case 'u': case 'v': case 'w': case 'x': | |
1149 | case 'y': case 'z': | |
1150 | case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': | |
1151 | case 'G': case 'H': case 'I': case 'J': case 'K': case 'L': | |
1152 | case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': | |
1153 | case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': | |
1154 | case 'Y': case 'Z': | |
1155 | result->type = CPP_NAME; | |
1156 | result->val.node = parse_identifier (pfile, c); | |
1157 | ||
1158 | /* 'L' may introduce wide characters or strings. */ | |
1159 | if (result->val.node == pfile->spec_nodes->n_L) | |
1160 | { | |
1161 | c = buffer->read_ahead; /* For make_string. */ | |
1162 | if (c == '\'' || c == '"') | |
ba89d661 | 1163 | { |
0d9f234d NB |
1164 | ACCEPT_CHAR (c == '"' ? CPP_WSTRING: CPP_WCHAR); |
1165 | goto make_string; | |
ba89d661 | 1166 | } |
0d9f234d NB |
1167 | } |
1168 | /* Convert named operators to their proper types. */ | |
1169 | else if (result->val.node->type == T_OPERATOR) | |
1170 | { | |
1171 | result->flags |= NAMED_OP; | |
1172 | result->type = result->val.node->value.code; | |
1173 | } | |
1174 | break; | |
1175 | ||
1176 | case '\'': | |
1177 | case '"': | |
1178 | result->type = c == '"' ? CPP_STRING: CPP_CHAR; | |
1179 | make_string: | |
1180 | parse_string (pfile, result, c); | |
1181 | break; | |
041c3194 | 1182 | |
0d9f234d | 1183 | case '/': |
1c6d33ef NB |
1184 | /* A potential block or line comment. */ |
1185 | comment_start = buffer->cur; | |
0d9f234d NB |
1186 | result->type = CPP_DIV; |
1187 | c = get_effective_char (buffer); | |
1188 | if (c == '=') | |
1189 | ACCEPT_CHAR (CPP_DIV_EQ); | |
1c6d33ef NB |
1190 | if (c != '/' && c != '*') |
1191 | break; | |
45b966db | 1192 | |
1c6d33ef NB |
1193 | if (c == '*') |
1194 | { | |
0d9f234d NB |
1195 | if (skip_block_comment (pfile)) |
1196 | cpp_error_with_line (pfile, result->line, result->col, | |
1197 | "unterminated comment"); | |
0d9f234d | 1198 | } |
1c6d33ef | 1199 | else |
0d9f234d | 1200 | { |
1c6d33ef NB |
1201 | if (!CPP_OPTION (pfile, cplusplus_comments) |
1202 | && !CPP_IN_SYSTEM_HEADER (pfile)) | |
1203 | break; | |
1204 | ||
0d9f234d NB |
1205 | /* We silently allow C++ comments in system headers, |
1206 | irrespective of conformance mode, because lots of | |
1207 | broken systems do that and trying to clean it up in | |
1208 | fixincludes is a nightmare. */ | |
a94c1199 NB |
1209 | if (CPP_OPTION (pfile, c89) && CPP_PEDANTIC (pfile) |
1210 | && ! buffer->warned_cplusplus_comments) | |
041c3194 | 1211 | { |
1c6d33ef NB |
1212 | cpp_pedwarn (pfile, |
1213 | "C++ style comments are not allowed in ISO C89"); | |
1214 | cpp_pedwarn (pfile, | |
1215 | "(this will be reported only once per input file)"); | |
1216 | buffer->warned_cplusplus_comments = 1; | |
1217 | } | |
0d9f234d | 1218 | |
a94c1199 | 1219 | /* Skip_line_comment updates buffer->read_ahead. */ |
1c6d33ef NB |
1220 | if (skip_line_comment (pfile)) |
1221 | cpp_warning_with_line (pfile, result->line, result->col, | |
1222 | "multi-line comment"); | |
1223 | } | |
0d9f234d | 1224 | |
1c6d33ef NB |
1225 | /* Skipping the comment has updated buffer->read_ahead. */ |
1226 | if (!pfile->state.save_comments) | |
1227 | { | |
1228 | result->flags |= PREV_WHITE; | |
1229 | goto next_char; | |
0d9f234d | 1230 | } |
1c6d33ef NB |
1231 | |
1232 | /* Save the comment as a token in its own right. */ | |
1233 | save_comment (pfile, result, comment_start); | |
0d9f234d NB |
1234 | break; |
1235 | ||
1236 | case '<': | |
1237 | if (pfile->state.angled_headers) | |
1238 | { | |
1239 | result->type = CPP_HEADER_NAME; | |
1240 | c = '>'; /* terminator. */ | |
1241 | goto make_string; | |
1242 | } | |
45b966db | 1243 | |
0d9f234d NB |
1244 | result->type = CPP_LESS; |
1245 | c = get_effective_char (buffer); | |
1246 | if (c == '=') | |
1247 | ACCEPT_CHAR (CPP_LESS_EQ); | |
1248 | else if (c == '<') | |
1249 | { | |
1250 | ACCEPT_CHAR (CPP_LSHIFT); | |
1251 | if (get_effective_char (buffer) == '=') | |
1252 | ACCEPT_CHAR (CPP_LSHIFT_EQ); | |
1253 | } | |
1254 | else if (c == '?' && CPP_OPTION (pfile, cplusplus)) | |
1255 | { | |
1256 | ACCEPT_CHAR (CPP_MIN); | |
1257 | if (get_effective_char (buffer) == '=') | |
1258 | ACCEPT_CHAR (CPP_MIN_EQ); | |
1259 | } | |
1260 | else if (c == ':' && CPP_OPTION (pfile, digraphs)) | |
1261 | { | |
1262 | ACCEPT_CHAR (CPP_OPEN_SQUARE); | |
1263 | result->flags |= DIGRAPH; | |
1264 | } | |
1265 | else if (c == '%' && CPP_OPTION (pfile, digraphs)) | |
1266 | { | |
1267 | ACCEPT_CHAR (CPP_OPEN_BRACE); | |
1268 | result->flags |= DIGRAPH; | |
1269 | } | |
1270 | break; | |
1271 | ||
1272 | case '>': | |
1273 | result->type = CPP_GREATER; | |
1274 | c = get_effective_char (buffer); | |
1275 | if (c == '=') | |
1276 | ACCEPT_CHAR (CPP_GREATER_EQ); | |
1277 | else if (c == '>') | |
1278 | { | |
1279 | ACCEPT_CHAR (CPP_RSHIFT); | |
1280 | if (get_effective_char (buffer) == '=') | |
1281 | ACCEPT_CHAR (CPP_RSHIFT_EQ); | |
1282 | } | |
1283 | else if (c == '?' && CPP_OPTION (pfile, cplusplus)) | |
1284 | { | |
1285 | ACCEPT_CHAR (CPP_MAX); | |
1286 | if (get_effective_char (buffer) == '=') | |
1287 | ACCEPT_CHAR (CPP_MAX_EQ); | |
1288 | } | |
1289 | break; | |
1290 | ||
cbcff6df NB |
1291 | case '%': |
1292 | lex_percent (buffer, result); | |
0d9f234d NB |
1293 | break; |
1294 | ||
cbcff6df NB |
1295 | case '.': |
1296 | lex_dot (pfile, result); | |
0d9f234d | 1297 | break; |
45b966db | 1298 | |
0d9f234d NB |
1299 | case '+': |
1300 | result->type = CPP_PLUS; | |
1301 | c = get_effective_char (buffer); | |
1302 | if (c == '=') | |
1303 | ACCEPT_CHAR (CPP_PLUS_EQ); | |
1304 | else if (c == '+') | |
1305 | ACCEPT_CHAR (CPP_PLUS_PLUS); | |
1306 | break; | |
04e3ec78 | 1307 | |
0d9f234d NB |
1308 | case '-': |
1309 | result->type = CPP_MINUS; | |
1310 | c = get_effective_char (buffer); | |
1311 | if (c == '>') | |
1312 | { | |
1313 | ACCEPT_CHAR (CPP_DEREF); | |
1314 | if (CPP_OPTION (pfile, cplusplus) | |
1315 | && get_effective_char (buffer) == '*') | |
1316 | ACCEPT_CHAR (CPP_DEREF_STAR); | |
1317 | } | |
1318 | else if (c == '=') | |
1319 | ACCEPT_CHAR (CPP_MINUS_EQ); | |
1320 | else if (c == '-') | |
1321 | ACCEPT_CHAR (CPP_MINUS_MINUS); | |
1322 | break; | |
45b966db | 1323 | |
0d9f234d NB |
1324 | case '*': |
1325 | result->type = CPP_MULT; | |
1326 | if (get_effective_char (buffer) == '=') | |
1327 | ACCEPT_CHAR (CPP_MULT_EQ); | |
1328 | break; | |
04e3ec78 | 1329 | |
0d9f234d NB |
1330 | case '=': |
1331 | result->type = CPP_EQ; | |
1332 | if (get_effective_char (buffer) == '=') | |
1333 | ACCEPT_CHAR (CPP_EQ_EQ); | |
1334 | break; | |
f8f769ea | 1335 | |
0d9f234d NB |
1336 | case '!': |
1337 | result->type = CPP_NOT; | |
1338 | if (get_effective_char (buffer) == '=') | |
1339 | ACCEPT_CHAR (CPP_NOT_EQ); | |
1340 | break; | |
45b966db | 1341 | |
0d9f234d NB |
1342 | case '&': |
1343 | result->type = CPP_AND; | |
1344 | c = get_effective_char (buffer); | |
1345 | if (c == '=') | |
1346 | ACCEPT_CHAR (CPP_AND_EQ); | |
1347 | else if (c == '&') | |
1348 | ACCEPT_CHAR (CPP_AND_AND); | |
1349 | break; | |
1350 | ||
1351 | case '#': | |
1352 | result->type = CPP_HASH; | |
1353 | if (get_effective_char (buffer) == '#') | |
1354 | ACCEPT_CHAR (CPP_PASTE); | |
1355 | break; | |
45b966db | 1356 | |
0d9f234d NB |
1357 | case '|': |
1358 | result->type = CPP_OR; | |
1359 | c = get_effective_char (buffer); | |
1360 | if (c == '=') | |
1361 | ACCEPT_CHAR (CPP_OR_EQ); | |
1362 | else if (c == '|') | |
1363 | ACCEPT_CHAR (CPP_OR_OR); | |
1364 | break; | |
45b966db | 1365 | |
0d9f234d NB |
1366 | case '^': |
1367 | result->type = CPP_XOR; | |
1368 | if (get_effective_char (buffer) == '=') | |
1369 | ACCEPT_CHAR (CPP_XOR_EQ); | |
1370 | break; | |
45b966db | 1371 | |
0d9f234d NB |
1372 | case ':': |
1373 | result->type = CPP_COLON; | |
1374 | c = get_effective_char (buffer); | |
1375 | if (c == ':' && CPP_OPTION (pfile, cplusplus)) | |
1376 | ACCEPT_CHAR (CPP_SCOPE); | |
1377 | else if (c == '>' && CPP_OPTION (pfile, digraphs)) | |
1378 | { | |
1379 | result->flags |= DIGRAPH; | |
1380 | ACCEPT_CHAR (CPP_CLOSE_SQUARE); | |
1381 | } | |
1382 | break; | |
45b966db | 1383 | |
0d9f234d NB |
1384 | case '~': result->type = CPP_COMPL; break; |
1385 | case ',': result->type = CPP_COMMA; break; | |
1386 | case '(': result->type = CPP_OPEN_PAREN; break; | |
1387 | case ')': result->type = CPP_CLOSE_PAREN; break; | |
1388 | case '[': result->type = CPP_OPEN_SQUARE; break; | |
1389 | case ']': result->type = CPP_CLOSE_SQUARE; break; | |
1390 | case '{': result->type = CPP_OPEN_BRACE; break; | |
1391 | case '}': result->type = CPP_CLOSE_BRACE; break; | |
1392 | case ';': result->type = CPP_SEMICOLON; break; | |
1393 | ||
1394 | case '@': | |
1395 | if (CPP_OPTION (pfile, objc)) | |
1396 | { | |
1397 | /* In Objective C, '@' may begin keywords or strings, like | |
1398 | @keyword or @"string". It would be nice to call | |
1399 | get_effective_char here and test the result. However, we | |
1400 | would then need to pass 2 characters to parse_identifier, | |
1401 | making it ugly and slowing down its main loop. Instead, | |
1402 | we assume we have an identifier, and recover if not. */ | |
1403 | result->type = CPP_NAME; | |
1404 | result->val.node = parse_identifier (pfile, c); | |
1405 | if (result->val.node->length != 1) | |
1406 | break; | |
04e3ec78 | 1407 | |
0d9f234d NB |
1408 | /* OK, so it wasn't an identifier. Maybe a string? */ |
1409 | if (buffer->read_ahead == '"') | |
041c3194 | 1410 | { |
0d9f234d NB |
1411 | c = '"'; |
1412 | ACCEPT_CHAR (CPP_OSTRING); | |
1413 | goto make_string; | |
041c3194 | 1414 | } |
0d9f234d NB |
1415 | } |
1416 | goto random_char; | |
1417 | ||
1418 | random_char: | |
1419 | default: | |
1420 | result->type = CPP_OTHER; | |
1421 | result->val.aux = c; | |
1422 | break; | |
1423 | } | |
1424 | } | |
1425 | ||
1426 | /* | |
1427 | * The tokenizer's main loop. Returns a token list, representing a | |
1428 | * logical line in the input file. On EOF after some tokens have | |
1429 | * been processed, we return immediately. Then in next call, or if | |
1430 | * EOF occurred at the beginning of a logical line, a single CPP_EOF | |
1431 | * token is placed in the list. | |
1432 | */ | |
1433 | ||
1434 | static void | |
1435 | lex_line (pfile, list) | |
1436 | cpp_reader *pfile; | |
1437 | cpp_toklist *list; | |
1438 | { | |
1439 | unsigned int first_token; | |
1440 | cpp_token *cur_token, *first; | |
1441 | cpp_buffer *buffer = pfile->buffer; | |
45b966db | 1442 | |
0d9f234d NB |
1443 | pfile->state.in_lex_line = 1; |
1444 | if (pfile->buffer->cur == pfile->buffer->buf) | |
1445 | list->flags |= BEG_OF_FILE; | |
1446 | ||
1447 | retry: | |
1448 | pfile->state.in_directive = 0; | |
1449 | pfile->state.angled_headers = 0; | |
1450 | pfile->state.skip_newlines = 1; | |
1451 | pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); | |
1452 | first_token = list->tokens_used; | |
1453 | list->file = buffer->nominal_fname; | |
1454 | ||
1455 | do | |
1456 | { | |
1457 | if (list->tokens_used >= list->tokens_cap) | |
1458 | _cpp_expand_token_space (list, 256); | |
1459 | ||
1460 | cur_token = list->tokens + list->tokens_used; | |
1461 | lex_token (pfile, cur_token); | |
1462 | ||
1463 | if (pfile->state.skip_newlines) | |
1464 | { | |
1465 | pfile->state.skip_newlines = 0; | |
1466 | list->line = buffer->lineno; | |
1467 | if (cur_token->type == CPP_HASH) | |
041c3194 | 1468 | { |
0d9f234d NB |
1469 | pfile->state.in_directive = 1; |
1470 | pfile->state.save_comments = 0; | |
1471 | pfile->state.indented = cur_token->flags & PREV_WHITE; | |
041c3194 | 1472 | } |
0d9f234d NB |
1473 | /* 6.10.3.10: Within the sequence of preprocessing tokens |
1474 | making up the invocation of a function-like macro, new | |
1475 | line is considered a normal white-space character. */ | |
1476 | else if (first_token != 0) | |
1477 | cur_token->flags |= PREV_WHITE; | |
1478 | } | |
1479 | else if (IN_DIRECTIVE (pfile) && list->tokens_used == first_token + 1) | |
1480 | { | |
1481 | if (cur_token->type == CPP_NUMBER) | |
1482 | list->directive = _cpp_check_linemarker (pfile, cur_token); | |
041c3194 | 1483 | else |
0d9f234d | 1484 | list->directive = _cpp_check_directive (pfile, cur_token); |
041c3194 | 1485 | } |
6d2c2047 | 1486 | |
0d9f234d NB |
1487 | /* _cpp_get_line assumes list->tokens_used refers to the current |
1488 | token being lexed. So do this after _cpp_check_directive to | |
1489 | get the warnings therein correct. */ | |
1490 | list->tokens_used++; | |
041c3194 | 1491 | } |
0d9f234d | 1492 | while (cur_token->type != CPP_EOF); |
6d2c2047 | 1493 | |
041c3194 ZW |
1494 | /* All tokens are allocated, so the memory location is fixed. */ |
1495 | first = &list->tokens[first_token]; | |
0d9f234d NB |
1496 | first->flags |= BOL; |
1497 | pfile->first_directive_token = first; | |
1498 | ||
041c3194 ZW |
1499 | /* Don't complain about the null directive, nor directives in |
1500 | assembly source: we don't know where the comments are, and # may | |
1501 | introduce assembler pseudo-ops. Don't complain about invalid | |
1502 | directives in skipped conditional groups (6.10 p4). */ | |
0d9f234d NB |
1503 | if (IN_DIRECTIVE (pfile) && !KNOWN_DIRECTIVE (list) && !pfile->skipping |
1504 | && !CPP_OPTION (pfile, lang_asm)) | |
041c3194 | 1505 | { |
0d9f234d NB |
1506 | if (cur_token > first + 1) |
1507 | { | |
1508 | if (first[1].type == CPP_NAME) | |
1509 | cpp_error_with_line (pfile, first->line, first->col, | |
1510 | "invalid preprocessing directive #%s", | |
1511 | first[1].val.node->name); | |
1512 | else | |
1513 | cpp_error_with_line (pfile, first->line, first->col, | |
1514 | "invalid preprocessing directive"); | |
1515 | } | |
9ec7291f ZW |
1516 | |
1517 | /* Discard this line to prevent further errors from cc1. */ | |
1518 | _cpp_clear_toklist (list); | |
1519 | goto retry; | |
041c3194 ZW |
1520 | } |
1521 | ||
7eea5554 NB |
1522 | /* Drop the EOF unless really at EOF or in a directive. */ |
1523 | if (cur_token != first && !KNOWN_DIRECTIVE (list) | |
1524 | && pfile->done_initializing) | |
1525 | list->tokens_used--; | |
1526 | ||
0d9f234d | 1527 | pfile->state.in_lex_line = 0; |
6d2c2047 ZW |
1528 | } |
1529 | ||
041c3194 | 1530 | /* Write the spelling of a token TOKEN to BUFFER. The buffer must |
cf00a885 ZW |
1531 | already contain the enough space to hold the token's spelling. |
1532 | Returns a pointer to the character after the last character | |
1533 | written. */ | |
d6d5f795 | 1534 | |
041c3194 ZW |
1535 | static unsigned char * |
1536 | spell_token (pfile, token, buffer) | |
1537 | cpp_reader *pfile; /* Would be nice to be rid of this... */ | |
1538 | const cpp_token *token; | |
1539 | unsigned char *buffer; | |
1540 | { | |
96be6998 | 1541 | switch (TOKEN_SPELL (token)) |
041c3194 ZW |
1542 | { |
1543 | case SPELL_OPERATOR: | |
1544 | { | |
1545 | const unsigned char *spelling; | |
1546 | unsigned char c; | |
d6d5f795 | 1547 | |
041c3194 | 1548 | if (token->flags & DIGRAPH) |
7de4d004 | 1549 | spelling = _cpp_digraph_spellings[token->type - CPP_FIRST_DIGRAPH]; |
92936ecf ZW |
1550 | else if (token->flags & NAMED_OP) |
1551 | goto spell_ident; | |
041c3194 | 1552 | else |
96be6998 | 1553 | spelling = TOKEN_NAME (token); |
041c3194 ZW |
1554 | |
1555 | while ((c = *spelling++) != '\0') | |
1556 | *buffer++ = c; | |
1557 | } | |
1558 | break; | |
d6d5f795 | 1559 | |
041c3194 | 1560 | case SPELL_IDENT: |
92936ecf | 1561 | spell_ident: |
bfb9dc7f ZW |
1562 | memcpy (buffer, token->val.node->name, token->val.node->length); |
1563 | buffer += token->val.node->length; | |
041c3194 | 1564 | break; |
d6d5f795 | 1565 | |
041c3194 ZW |
1566 | case SPELL_STRING: |
1567 | { | |
ba89d661 ZW |
1568 | int left, right, tag; |
1569 | switch (token->type) | |
1570 | { | |
1571 | case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break; | |
1572 | case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break; | |
1573 | case CPP_OSTRING: left = '"'; right = '"'; tag = '@'; break; | |
1574 | case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break; | |
1575 | case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break; | |
1576 | case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break; | |
1577 | default: left = '\0'; right = '\0'; tag = '\0'; break; | |
1578 | } | |
1579 | if (tag) *buffer++ = tag; | |
1580 | if (left) *buffer++ = left; | |
bfb9dc7f ZW |
1581 | memcpy (buffer, token->val.str.text, token->val.str.len); |
1582 | buffer += token->val.str.len; | |
ba89d661 | 1583 | if (right) *buffer++ = right; |
041c3194 ZW |
1584 | } |
1585 | break; | |
d6d5f795 | 1586 | |
041c3194 ZW |
1587 | case SPELL_CHAR: |
1588 | *buffer++ = token->val.aux; | |
1589 | break; | |
d6d5f795 | 1590 | |
041c3194 | 1591 | case SPELL_NONE: |
96be6998 | 1592 | cpp_ice (pfile, "Unspellable token %s", TOKEN_NAME (token)); |
041c3194 ZW |
1593 | break; |
1594 | } | |
d6d5f795 | 1595 | |
041c3194 ZW |
1596 | return buffer; |
1597 | } | |
d6d5f795 | 1598 | |
f67798e7 NB |
1599 | /* Macro expansion algorithm. |
1600 | ||
1601 | Macro expansion is implemented by a single-pass algorithm; there are | |
1602 | no rescan passes involved. cpp_get_token expands just enough to be | |
1603 | able to return a token to the caller, a consequence is that when it | |
1604 | returns the preprocessor can be in a state of mid-expansion. The | |
1605 | algorithm does not work by fully expanding a macro invocation into | |
1606 | some kind of token list, and then returning them one by one. | |
1607 | ||
1608 | Our expansion state is recorded in a context stack. We start out with | |
1609 | a single context on the stack, let's call it base context. This | |
1610 | consists of the token list returned by lex_line that forms the next | |
1611 | logical line in the source file. | |
1612 | ||
1613 | The current level in the context stack is stored in the cur_context | |
1614 | member of the cpp_reader structure. The context it references keeps, | |
1615 | amongst other things, a count of how many tokens form that context and | |
1616 | our position within those tokens. | |
1617 | ||
1618 | Fundamentally, calling cpp_get_token will return the next token from | |
1619 | the current context. If we're at the end of the current context, that | |
1620 | context is popped from the stack first, unless it is the base context, | |
1621 | in which case the next logical line is lexed from the source file. | |
1622 | ||
1623 | However, before returning the token, if it is a CPP_NAME token | |
1624 | _cpp_get_token checks to see if it is a macro and if it is enabled. | |
1625 | Each time it encounters a macro name, it calls push_macro_context. | |
1626 | This function checks that the macro should be expanded (with | |
1627 | is_macro_enabled), and if so pushes a new macro context on the stack | |
1628 | which becomes the current context. It then loops back to read the | |
1629 | first token of the macro context. | |
1630 | ||
1631 | A macro context basically consists of the token list representing the | |
1632 | macro's replacement list, which was saved in the hash table by | |
1633 | save_macro_expansion when its #define statement was parsed. If the | |
1634 | macro is function-like, it also contains the tokens that form the | |
1635 | arguments to the macro. I say more about macro arguments below, but | |
1636 | for now just saying that each argument is a set of pointers to tokens | |
1637 | is enough. | |
1638 | ||
1639 | When taking tokens from a macro context, we may get a CPP_MACRO_ARG | |
1640 | token. This represents an argument passed to the macro, with the | |
1641 | argument number stored in the token's AUX field. The argument should | |
1642 | be substituted, this is achieved by pushing an "argument context". An | |
1643 | argument context is just refers to the tokens forming the argument, | |
1644 | which are obtained directly from the macro context. The STRINGIFY | |
1645 | flag on a CPP_MACRO_ARG token indicates that the argument should be | |
1646 | stringified. | |
1647 | ||
1648 | Here's a few simple rules the context stack obeys:- | |
1649 | ||
1650 | 1) The lex_line token list is always context zero. | |
1651 | ||
1652 | 2) Context 1, if it exists, must be a macro context. | |
1653 | ||
1654 | 3) An argument context can only appear above a macro context. | |
1655 | ||
1656 | 4) A macro context can appear above the base context, another macro | |
1657 | context, or an argument context. | |
1658 | ||
1659 | 5) These imply that the minimal level of an argument context is 2. | |
1660 | ||
1661 | The only tricky thing left is ensuring that macros are enabled and | |
1662 | disabled correctly. The algorithm controls macro expansion by the | |
1663 | level of the context a token is taken from in the context stack. If a | |
1664 | token is taken from a level equal to no_expand_level (a member of | |
1665 | struct cpp_reader), no expansion is performed. | |
1666 | ||
1667 | When popping a context off the stack, if no_expand_level equals the | |
1668 | level of the popped context, it is reduced by one to match the new | |
1669 | context level, so that expansion is still disabled. It does not | |
1670 | increase if a context is pushed, though. It starts out life as | |
1671 | UINT_MAX, which has the effect that initially macro expansion is | |
1672 | enabled. I explain how this mechanism works below. | |
1673 | ||
1674 | The standard requires:- | |
1675 | ||
1676 | 1) Arguments to be fully expanded before substitution. | |
1677 | ||
1678 | 2) Stringified arguments to not be expanded, nor the tokens | |
1679 | immediately surrounding a ## operator. | |
1680 | ||
1681 | 3) Continual rescanning until there are no more macros left to | |
1682 | replace. | |
1683 | ||
1684 | 4) Once a macro has been expanded in stage 1) or 3), it cannot be | |
1685 | expanded again during later rescans. This prevents infinite | |
1686 | recursion. | |
1687 | ||
1688 | The first thing to observe is that stage 3) is mostly redundant. | |
1689 | Since a macro is disabled once it has been expanded, how can a rescan | |
1690 | find an unexpanded macro name? There are only two cases where this is | |
1691 | possible:- | |
1692 | ||
1693 | a) If the macro name results from a token paste operation. | |
1694 | ||
1695 | b) If the macro in question is a function-like macro that hasn't | |
1696 | already been expanded because previously there was not the required | |
1697 | '(' token immediately following it. This is only possible when an | |
1698 | argument is substituted, and after substitution the last token of | |
1699 | the argument can bind with a parenthesis appearing in the tokens | |
1700 | following the substitution. Note that if the '(' appears within the | |
1701 | argument, the ')' must too, as expanding macro arguments cannot | |
1702 | "suck in" tokens outside the argument. | |
1703 | ||
1704 | So we tackle this as follows. When parsing the macro invocation for | |
1705 | arguments, we record the tokens forming each argument as a list of | |
1706 | pointers to those tokens. We do not expand any tokens that are "raw", | |
1707 | i.e. directly from the macro invocation, but other tokens that come | |
1708 | from (nested) argument substitution are fully expanded. | |
1709 | ||
1710 | This is achieved by setting the no_expand_level to that of the macro | |
1711 | invocation. A CPP_MACRO_ARG token never appears in the list of tokens | |
1712 | forming an argument, because parse_args (indirectly) calls | |
1713 | get_raw_token which automatically pushes argument contexts and traces | |
1714 | into them. Since these contexts are at a higher level than the | |
1715 | no_expand_level, they get fully macro expanded. | |
1716 | ||
1717 | "Raw" and non-raw tokens are separated in arguments by null pointers, | |
1718 | with the policy that the initial state of an argument is raw. If the | |
1719 | first token is not raw, it should be preceded by a null pointer. When | |
1720 | tracing through the tokens of an argument context, each time | |
1721 | get_raw_token encounters a null pointer, it toggles the flag | |
1722 | CONTEXT_RAW. | |
1723 | ||
1724 | This flag, when set, indicates to is_macro_disabled that we are | |
1725 | reading raw tokens which should be macro-expanded. Similarly, if | |
1726 | clear, is_macro_disabled suppresses re-expansion. | |
1727 | ||
1728 | It's probably time for an example. | |
1729 | ||
1730 | #define hash # | |
1731 | #define str(x) #x | |
1732 | #define xstr(y) str(y hash) | |
1733 | str(hash) // "hash" | |
1734 | xstr(hash) // "# hash" | |
1735 | ||
1736 | In the invocation of str, parse_args turns off macro expansion and so | |
1737 | parses the argument as <hash>. This is the only token (pointer) | |
1738 | passed as the argument to str. Since <hash> is raw there is no need | |
1739 | for an initial null pointer. stringify_arg is called from | |
1740 | get_raw_token when tracing through the expansion of str, since the | |
1741 | argument has the STRINGIFY flag set. stringify_arg turns off | |
1742 | macro_expansion by setting the no_expand_level to that of the argument | |
1743 | context. Thus it gets the token <hash> and stringifies it to "hash" | |
1744 | correctly. | |
1745 | ||
1746 | Similary xstr is passed <hash>. However, when parse_args is parsing | |
1747 | the invocation of str() in xstr's expansion, get_raw_token encounters | |
1748 | a CPP_MACRO_ARG token for y. Transparently to parse_args, it pushes | |
1749 | an argument context, and enters the tokens of the argument, | |
1750 | i.e. <hash>. This is at a higher context level than parse_args | |
1751 | disabled, and so is_macro_disabled permits expansion of it and a macro | |
1752 | context is pushed on top of the argument context. This contains the | |
1753 | <#> token, and the end result is that <hash> is macro expanded. | |
1754 | However, after popping off the argument context, the <hash> of xstr's | |
1755 | expansion does not get macro expanded because we're back at the | |
1756 | no_expand_level. The end result is that the argument passed to str is | |
1757 | <NULL> <#> <NULL> <hash>. Note the nulls - policy is we start off | |
1758 | raw, <#> is not raw, but then <hash> is. | |
1759 | ||
1760 | */ | |
d6d5f795 | 1761 | |
041c3194 ZW |
1762 | |
1763 | /* Free the storage allocated for macro arguments. */ | |
1764 | static void | |
1765 | free_macro_args (args) | |
1766 | macro_args *args; | |
c5a04734 | 1767 | { |
041c3194 | 1768 | if (args->tokens) |
417f3e3a | 1769 | free ((PTR) args->tokens); |
041c3194 ZW |
1770 | free (args->ends); |
1771 | free (args); | |
c5a04734 ZW |
1772 | } |
1773 | ||
041c3194 ZW |
1774 | /* Determines if a macro has been already used (and is therefore |
1775 | disabled). */ | |
c5a04734 | 1776 | static int |
041c3194 | 1777 | is_macro_disabled (pfile, expansion, token) |
c5a04734 | 1778 | cpp_reader *pfile; |
041c3194 ZW |
1779 | const cpp_toklist *expansion; |
1780 | const cpp_token *token; | |
c5a04734 | 1781 | { |
041c3194 ZW |
1782 | cpp_context *context = CURRENT_CONTEXT (pfile); |
1783 | ||
1784 | /* Arguments on either side of ## are inserted in place without | |
1785 | macro expansion (6.10.3.3.2). Conceptually, any macro expansion | |
1786 | occurs during a later rescan pass. The effect is that we expand | |
1787 | iff we would as part of the macro's expansion list, so we should | |
1788 | drop to the macro's context. */ | |
1789 | if (IS_ARG_CONTEXT (context)) | |
c5a04734 | 1790 | { |
041c3194 ZW |
1791 | if (token->flags & PASTED) |
1792 | context--; | |
1793 | else if (!(context->flags & CONTEXT_RAW)) | |
1794 | return 1; | |
1795 | else if (context->flags & (CONTEXT_PASTEL | CONTEXT_PASTER)) | |
1796 | context--; | |
c5a04734 | 1797 | } |
c5a04734 | 1798 | |
041c3194 ZW |
1799 | /* Have we already used this macro? */ |
1800 | while (context->level > 0) | |
c5a04734 | 1801 | { |
041c3194 ZW |
1802 | if (!IS_ARG_CONTEXT (context) && context->u.list == expansion) |
1803 | return 1; | |
1804 | /* Raw argument tokens are judged based on the token list they | |
1805 | came from. */ | |
1806 | if (context->flags & CONTEXT_RAW) | |
1807 | context = pfile->contexts + context->level; | |
1808 | else | |
1809 | context--; | |
1810 | } | |
c5a04734 | 1811 | |
041c3194 ZW |
1812 | /* Function-like macros may be disabled if the '(' is not in the |
1813 | current context. We check this without disrupting the context | |
1814 | stack. */ | |
1815 | if (expansion->paramc >= 0) | |
1816 | { | |
1817 | const cpp_token *next; | |
1818 | unsigned int prev_nme; | |
c5a04734 | 1819 | |
041c3194 ZW |
1820 | context = CURRENT_CONTEXT (pfile); |
1821 | /* Drop down any contexts we're at the end of: the '(' may | |
1822 | appear in lower macro expansions, or in the rest of the file. */ | |
1823 | while (context->posn == context->count && context > pfile->contexts) | |
1824 | { | |
1825 | context--; | |
1826 | /* If we matched, we are disabled, as we appear in the | |
1827 | expansion of each macro we meet. */ | |
1828 | if (!IS_ARG_CONTEXT (context) && context->u.list == expansion) | |
1829 | return 1; | |
1830 | } | |
c5a04734 | 1831 | |
041c3194 ZW |
1832 | prev_nme = pfile->no_expand_level; |
1833 | pfile->no_expand_level = context - pfile->contexts; | |
417f3e3a | 1834 | next = _cpp_get_token (pfile); |
041c3194 | 1835 | restore_macro_expansion (pfile, prev_nme); |
d8090680 | 1836 | |
041c3194 ZW |
1837 | if (next->type != CPP_OPEN_PAREN) |
1838 | { | |
1839 | _cpp_push_token (pfile, next); | |
b9bf5af8 | 1840 | if (CPP_WTRADITIONAL (pfile)) |
041c3194 | 1841 | cpp_warning (pfile, |
92936ecf ZW |
1842 | "function macro %s must be used with arguments in traditional C", |
1843 | token->val.node->name); | |
041c3194 ZW |
1844 | return 1; |
1845 | } | |
c5a04734 | 1846 | } |
c5a04734 | 1847 | |
041c3194 | 1848 | return 0; |
c5a04734 ZW |
1849 | } |
1850 | ||
041c3194 ZW |
1851 | /* Add a token to the set of tokens forming the arguments to the macro |
1852 | being parsed in parse_args. */ | |
1853 | static void | |
1854 | save_token (args, token) | |
1855 | macro_args *args; | |
1856 | const cpp_token *token; | |
c5a04734 | 1857 | { |
041c3194 ZW |
1858 | if (args->used == args->capacity) |
1859 | { | |
1860 | args->capacity += args->capacity + 100; | |
1861 | args->tokens = (const cpp_token **) | |
417f3e3a ZW |
1862 | xrealloc ((PTR) args->tokens, |
1863 | args->capacity * sizeof (const cpp_token *)); | |
041c3194 ZW |
1864 | } |
1865 | args->tokens[args->used++] = token; | |
c5a04734 ZW |
1866 | } |
1867 | ||
041c3194 ZW |
1868 | /* Take and save raw tokens until we finish one argument. Empty |
1869 | arguments are saved as a single CPP_PLACEMARKER token. */ | |
1870 | static const cpp_token * | |
1871 | parse_arg (pfile, var_args, paren_context, args, pcount) | |
c5a04734 | 1872 | cpp_reader *pfile; |
041c3194 ZW |
1873 | int var_args; |
1874 | unsigned int paren_context; | |
1875 | macro_args *args; | |
1876 | unsigned int *pcount; | |
c5a04734 | 1877 | { |
041c3194 ZW |
1878 | const cpp_token *token; |
1879 | unsigned int paren = 0, count = 0; | |
1880 | int raw, was_raw = 1; | |
c5a04734 | 1881 | |
041c3194 | 1882 | for (count = 0;; count++) |
c5a04734 | 1883 | { |
417f3e3a | 1884 | token = _cpp_get_token (pfile); |
c5a04734 | 1885 | |
041c3194 | 1886 | switch (token->type) |
c5a04734 | 1887 | { |
041c3194 ZW |
1888 | default: |
1889 | break; | |
c5a04734 | 1890 | |
041c3194 ZW |
1891 | case CPP_OPEN_PAREN: |
1892 | paren++; | |
1893 | break; | |
1894 | ||
1895 | case CPP_CLOSE_PAREN: | |
1896 | if (paren-- != 0) | |
1897 | break; | |
1898 | goto out; | |
1899 | ||
1900 | case CPP_COMMA: | |
1901 | /* Commas are not terminators within parantheses or var_args. */ | |
1902 | if (paren || var_args) | |
1903 | break; | |
1904 | goto out; | |
1905 | ||
1906 | case CPP_EOF: /* Error reported by caller. */ | |
1907 | goto out; | |
c5a04734 | 1908 | } |
c5a04734 | 1909 | |
041c3194 ZW |
1910 | raw = pfile->cur_context <= paren_context; |
1911 | if (raw != was_raw) | |
1912 | { | |
1913 | was_raw = raw; | |
1914 | save_token (args, 0); | |
1915 | count++; | |
c5a04734 | 1916 | } |
041c3194 | 1917 | save_token (args, token); |
c5a04734 | 1918 | } |
c5a04734 ZW |
1919 | |
1920 | out: | |
041c3194 ZW |
1921 | if (count == 0) |
1922 | { | |
1923 | /* Duplicate the placemarker. Then we can set its flags and | |
1924 | position and safely be using more than one. */ | |
1925 | save_token (args, duplicate_token (pfile, &placemarker_token)); | |
1926 | count++; | |
1927 | } | |
1928 | ||
1929 | *pcount = count; | |
1930 | return token; | |
c5a04734 ZW |
1931 | } |
1932 | ||
041c3194 ZW |
1933 | /* This macro returns true if the argument starting at offset O of arglist |
1934 | A is empty - that is, it's either a single PLACEMARKER token, or a null | |
1935 | pointer followed by a PLACEMARKER. */ | |
1936 | ||
1937 | #define empty_argument(A, O) \ | |
1938 | ((A)->tokens[O] ? (A)->tokens[O]->type == CPP_PLACEMARKER \ | |
1939 | : (A)->tokens[(O)+1]->type == CPP_PLACEMARKER) | |
1940 | ||
1941 | /* Parse the arguments making up a macro invocation. Nested arguments | |
1942 | are automatically macro expanded, but immediate macros are not | |
1943 | expanded; this enables e.g. operator # to work correctly. Returns | |
1944 | non-zero on error. */ | |
c5a04734 | 1945 | static int |
041c3194 | 1946 | parse_args (pfile, hp, args) |
c5a04734 | 1947 | cpp_reader *pfile; |
041c3194 ZW |
1948 | cpp_hashnode *hp; |
1949 | macro_args *args; | |
c5a04734 | 1950 | { |
041c3194 ZW |
1951 | const cpp_token *token; |
1952 | const cpp_toklist *macro; | |
1953 | unsigned int total = 0; | |
1954 | unsigned int paren_context = pfile->cur_context; | |
1955 | int argc = 0; | |
1956 | ||
1957 | macro = hp->value.expansion; | |
1958 | do | |
c5a04734 | 1959 | { |
041c3194 | 1960 | unsigned int count; |
c5a04734 | 1961 | |
041c3194 ZW |
1962 | token = parse_arg (pfile, (argc + 1 == macro->paramc |
1963 | && (macro->flags & VAR_ARGS)), | |
1964 | paren_context, args, &count); | |
1965 | if (argc < macro->paramc) | |
c5a04734 | 1966 | { |
041c3194 ZW |
1967 | total += count; |
1968 | args->ends[argc] = total; | |
c5a04734 | 1969 | } |
041c3194 | 1970 | argc++; |
c5a04734 | 1971 | } |
041c3194 | 1972 | while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); |
c5a04734 | 1973 | |
041c3194 ZW |
1974 | if (token->type == CPP_EOF) |
1975 | { | |
92936ecf | 1976 | cpp_error(pfile, "unterminated argument list for macro \"%s\"", hp->name); |
041c3194 ZW |
1977 | return 1; |
1978 | } | |
1979 | else if (argc < macro->paramc) | |
1980 | { | |
1981 | /* A rest argument is allowed to not appear in the invocation at all. | |
1982 | e.g. #define debug(format, args...) ... | |
1983 | debug("string"); | |
1984 | This is exactly the same as if the rest argument had received no | |
563dd08a | 1985 | tokens - debug("string",); This extension is deprecated. */ |
6fee6033 ZW |
1986 | |
1987 | if (argc + 1 == macro->paramc && (macro->flags & VAR_ARGS)) | |
041c3194 ZW |
1988 | { |
1989 | /* Duplicate the placemarker. Then we can set its flags and | |
1990 | position and safely be using more than one. */ | |
a94c1199 | 1991 | save_token (args, duplicate_token (pfile, &placemarker_token)); |
041c3194 | 1992 | args->ends[argc] = total + 1; |
6fee6033 ZW |
1993 | |
1994 | if (CPP_OPTION (pfile, c99) && CPP_PEDANTIC (pfile)) | |
1995 | cpp_pedwarn (pfile, "ISO C99 requires rest arguments to be used"); | |
1996 | ||
041c3194 ZW |
1997 | return 0; |
1998 | } | |
1999 | else | |
2000 | { | |
d8090680 NB |
2001 | cpp_error (pfile, "%u arguments is not enough for macro \"%s\"", |
2002 | argc, hp->name); | |
041c3194 ZW |
2003 | return 1; |
2004 | } | |
2005 | } | |
2006 | /* An empty argument to an empty function-like macro is fine. */ | |
2007 | else if (argc > macro->paramc | |
2008 | && !(macro->paramc == 0 && argc == 1 && empty_argument (args, 0))) | |
2009 | { | |
d8090680 NB |
2010 | cpp_error (pfile, "%u arguments is too many for macro \"%s\"", |
2011 | argc, hp->name); | |
041c3194 ZW |
2012 | return 1; |
2013 | } | |
c5a04734 | 2014 | |
041c3194 ZW |
2015 | return 0; |
2016 | } | |
2017 | ||
2018 | /* Adds backslashes before all backslashes and double quotes appearing | |
2019 | in strings. Non-printable characters are converted to octal. */ | |
2020 | static U_CHAR * | |
2021 | quote_string (dest, src, len) | |
2022 | U_CHAR *dest; | |
2023 | const U_CHAR *src; | |
2024 | unsigned int len; | |
2025 | { | |
2026 | while (len--) | |
c5a04734 | 2027 | { |
041c3194 | 2028 | U_CHAR c = *src++; |
c5a04734 | 2029 | |
041c3194 | 2030 | if (c == '\\' || c == '"') |
6ab3e7dd | 2031 | { |
041c3194 ZW |
2032 | *dest++ = '\\'; |
2033 | *dest++ = c; | |
2034 | } | |
2035 | else | |
2036 | { | |
2037 | if (ISPRINT (c)) | |
2038 | *dest++ = c; | |
2039 | else | |
2040 | { | |
2041 | sprintf ((char *) dest, "\\%03o", c); | |
2042 | dest += 4; | |
2043 | } | |
6ab3e7dd | 2044 | } |
c5a04734 | 2045 | } |
c5a04734 | 2046 | |
041c3194 | 2047 | return dest; |
c5a04734 ZW |
2048 | } |
2049 | ||
041c3194 ZW |
2050 | /* Allocates a buffer to hold a token's TEXT, and converts TOKEN to a |
2051 | CPP_STRING token containing TEXT in quoted form. */ | |
2052 | static cpp_token * | |
2053 | make_string_token (token, text, len) | |
2054 | cpp_token *token; | |
2055 | const U_CHAR *text; | |
2056 | unsigned int len; | |
2057 | { | |
2058 | U_CHAR *buf; | |
2059 | ||
2060 | buf = (U_CHAR *) xmalloc (len * 4); | |
2061 | token->type = CPP_STRING; | |
2062 | token->flags = 0; | |
bfb9dc7f ZW |
2063 | token->val.str.text = buf; |
2064 | token->val.str.len = quote_string (buf, text, len) - buf; | |
041c3194 ZW |
2065 | return token; |
2066 | } | |
2067 | ||
2068 | /* Allocates and converts a temporary token to a CPP_NUMBER token, | |
2069 | evaluating to NUMBER. */ | |
2070 | static cpp_token * | |
2071 | alloc_number_token (pfile, number) | |
c5a04734 | 2072 | cpp_reader *pfile; |
041c3194 | 2073 | int number; |
c5a04734 | 2074 | { |
041c3194 ZW |
2075 | cpp_token *result; |
2076 | char *buf; | |
2077 | ||
2078 | result = get_temp_token (pfile); | |
2079 | buf = xmalloc (20); | |
2080 | sprintf (buf, "%d", number); | |
2081 | ||
2082 | result->type = CPP_NUMBER; | |
2083 | result->flags = 0; | |
bfb9dc7f ZW |
2084 | result->val.str.text = (U_CHAR *) buf; |
2085 | result->val.str.len = strlen (buf); | |
041c3194 ZW |
2086 | return result; |
2087 | } | |
c5a04734 | 2088 | |
041c3194 ZW |
2089 | /* Returns a temporary token from the temporary token store of PFILE. */ |
2090 | static cpp_token * | |
2091 | get_temp_token (pfile) | |
2092 | cpp_reader *pfile; | |
2093 | { | |
2094 | if (pfile->temp_used == pfile->temp_alloced) | |
2095 | { | |
2096 | if (pfile->temp_used == pfile->temp_cap) | |
2097 | { | |
2098 | pfile->temp_cap += pfile->temp_cap + 20; | |
2099 | pfile->temp_tokens = (cpp_token **) xrealloc | |
2100 | (pfile->temp_tokens, pfile->temp_cap * sizeof (cpp_token *)); | |
2101 | } | |
2102 | pfile->temp_tokens[pfile->temp_alloced++] = (cpp_token *) xmalloc | |
2103 | (sizeof (cpp_token)); | |
2104 | } | |
c5a04734 | 2105 | |
041c3194 ZW |
2106 | return pfile->temp_tokens[pfile->temp_used++]; |
2107 | } | |
2108 | ||
2109 | /* Release (not free) for re-use the temporary tokens of PFILE. */ | |
2110 | static void | |
2111 | release_temp_tokens (pfile) | |
2112 | cpp_reader *pfile; | |
2113 | { | |
2114 | while (pfile->temp_used) | |
c5a04734 | 2115 | { |
041c3194 | 2116 | cpp_token *token = pfile->temp_tokens[--pfile->temp_used]; |
c5a04734 | 2117 | |
96be6998 | 2118 | if (TOKEN_SPELL (token) == SPELL_STRING) |
c5a04734 | 2119 | { |
bfb9dc7f ZW |
2120 | free ((char *) token->val.str.text); |
2121 | token->val.str.text = 0; | |
c5a04734 ZW |
2122 | } |
2123 | } | |
041c3194 | 2124 | } |
c5a04734 | 2125 | |
041c3194 ZW |
2126 | /* Free all of PFILE's dynamically-allocated temporary tokens. */ |
2127 | void | |
2128 | _cpp_free_temp_tokens (pfile) | |
2129 | cpp_reader *pfile; | |
2130 | { | |
2131 | if (pfile->temp_tokens) | |
c5a04734 | 2132 | { |
041c3194 ZW |
2133 | /* It is possible, though unlikely (looking for '(' of a funlike |
2134 | macro into EOF), that we haven't released the tokens yet. */ | |
2135 | release_temp_tokens (pfile); | |
2136 | while (pfile->temp_alloced) | |
2137 | free (pfile->temp_tokens[--pfile->temp_alloced]); | |
2138 | free (pfile->temp_tokens); | |
c5a04734 ZW |
2139 | } |
2140 | ||
041c3194 ZW |
2141 | if (pfile->date) |
2142 | { | |
bfb9dc7f | 2143 | free ((char *) pfile->date->val.str.text); |
041c3194 | 2144 | free (pfile->date); |
bfb9dc7f | 2145 | free ((char *) pfile->time->val.str.text); |
041c3194 ZW |
2146 | free (pfile->time); |
2147 | } | |
c5a04734 ZW |
2148 | } |
2149 | ||
041c3194 ZW |
2150 | /* Copy TOKEN into a temporary token from PFILE's store. */ |
2151 | static cpp_token * | |
2152 | duplicate_token (pfile, token) | |
2153 | cpp_reader *pfile; | |
2154 | const cpp_token *token; | |
2155 | { | |
2156 | cpp_token *result = get_temp_token (pfile); | |
c5a04734 | 2157 | |
041c3194 | 2158 | *result = *token; |
96be6998 | 2159 | if (TOKEN_SPELL (token) == SPELL_STRING) |
041c3194 | 2160 | { |
bfb9dc7f ZW |
2161 | U_CHAR *buff = (U_CHAR *) xmalloc (token->val.str.len); |
2162 | memcpy (buff, token->val.str.text, token->val.str.len); | |
2163 | result->val.str.text = buff; | |
041c3194 ZW |
2164 | } |
2165 | return result; | |
2166 | } | |
c5a04734 | 2167 | |
041c3194 ZW |
2168 | /* Determine whether two tokens can be pasted together, and if so, |
2169 | what the resulting token is. Returns CPP_EOF if the tokens cannot | |
2170 | be pasted, or the appropriate type for the merged token if they | |
2171 | can. */ | |
7de4d004 NB |
2172 | enum cpp_ttype |
2173 | _cpp_can_paste (pfile, token1, token2, digraph) | |
041c3194 ZW |
2174 | cpp_reader * pfile; |
2175 | const cpp_token *token1, *token2; | |
2176 | int* digraph; | |
c5a04734 | 2177 | { |
041c3194 ZW |
2178 | enum cpp_ttype a = token1->type, b = token2->type; |
2179 | int cxx = CPP_OPTION (pfile, cplusplus); | |
c5a04734 | 2180 | |
92936ecf ZW |
2181 | /* Treat named operators as if they were ordinary NAMEs. */ |
2182 | if (token1->flags & NAMED_OP) | |
2183 | a = CPP_NAME; | |
2184 | if (token2->flags & NAMED_OP) | |
2185 | b = CPP_NAME; | |
2186 | ||
041c3194 ZW |
2187 | if (a <= CPP_LAST_EQ && b == CPP_EQ) |
2188 | return a + (CPP_EQ_EQ - CPP_EQ); | |
c5a04734 | 2189 | |
041c3194 | 2190 | switch (a) |
c5a04734 | 2191 | { |
041c3194 ZW |
2192 | case CPP_GREATER: |
2193 | if (b == a) return CPP_RSHIFT; | |
2194 | if (b == CPP_QUERY && cxx) return CPP_MAX; | |
2195 | if (b == CPP_GREATER_EQ) return CPP_RSHIFT_EQ; | |
2196 | break; | |
2197 | case CPP_LESS: | |
2198 | if (b == a) return CPP_LSHIFT; | |
2199 | if (b == CPP_QUERY && cxx) return CPP_MIN; | |
2200 | if (b == CPP_LESS_EQ) return CPP_LSHIFT_EQ; | |
9b55f29a NB |
2201 | if (CPP_OPTION (pfile, digraphs)) |
2202 | { | |
2203 | if (b == CPP_COLON) | |
2204 | {*digraph = 1; return CPP_OPEN_SQUARE;} /* <: digraph */ | |
2205 | if (b == CPP_MOD) | |
2206 | {*digraph = 1; return CPP_OPEN_BRACE;} /* <% digraph */ | |
2207 | } | |
041c3194 | 2208 | break; |
c5a04734 | 2209 | |
041c3194 ZW |
2210 | case CPP_PLUS: if (b == a) return CPP_PLUS_PLUS; break; |
2211 | case CPP_AND: if (b == a) return CPP_AND_AND; break; | |
2212 | case CPP_OR: if (b == a) return CPP_OR_OR; break; | |
c5a04734 | 2213 | |
041c3194 ZW |
2214 | case CPP_MINUS: |
2215 | if (b == a) return CPP_MINUS_MINUS; | |
2216 | if (b == CPP_GREATER) return CPP_DEREF; | |
2217 | break; | |
2218 | case CPP_COLON: | |
2219 | if (b == a && cxx) return CPP_SCOPE; | |
9b55f29a | 2220 | if (b == CPP_GREATER && CPP_OPTION (pfile, digraphs)) |
041c3194 ZW |
2221 | {*digraph = 1; return CPP_CLOSE_SQUARE;} /* :> digraph */ |
2222 | break; | |
2223 | ||
2224 | case CPP_MOD: | |
9b55f29a NB |
2225 | if (CPP_OPTION (pfile, digraphs)) |
2226 | { | |
2227 | if (b == CPP_GREATER) | |
2228 | {*digraph = 1; return CPP_CLOSE_BRACE;} /* %> digraph */ | |
2229 | if (b == CPP_COLON) | |
2230 | {*digraph = 1; return CPP_HASH;} /* %: digraph */ | |
2231 | } | |
041c3194 ZW |
2232 | break; |
2233 | case CPP_DEREF: | |
2234 | if (b == CPP_MULT && cxx) return CPP_DEREF_STAR; | |
2235 | break; | |
2236 | case CPP_DOT: | |
2237 | if (b == CPP_MULT && cxx) return CPP_DOT_STAR; | |
2238 | if (b == CPP_NUMBER) return CPP_NUMBER; | |
2239 | break; | |
2240 | ||
2241 | case CPP_HASH: | |
2242 | if (b == a && (token1->flags & DIGRAPH) == (token2->flags & DIGRAPH)) | |
2243 | /* %:%: digraph */ | |
2244 | {*digraph = (token1->flags & DIGRAPH); return CPP_PASTE;} | |
2245 | break; | |
2246 | ||
2247 | case CPP_NAME: | |
2248 | if (b == CPP_NAME) return CPP_NAME; | |
2249 | if (b == CPP_NUMBER | |
bfb9dc7f | 2250 | && is_numstart(token2->val.str.text[0])) return CPP_NAME; |
041c3194 | 2251 | if (b == CPP_CHAR |
bfb9dc7f | 2252 | && token1->val.node == pfile->spec_nodes->n_L) return CPP_WCHAR; |
041c3194 | 2253 | if (b == CPP_STRING |
bfb9dc7f | 2254 | && token1->val.node == pfile->spec_nodes->n_L) return CPP_WSTRING; |
041c3194 ZW |
2255 | break; |
2256 | ||
2257 | case CPP_NUMBER: | |
2258 | if (b == CPP_NUMBER) return CPP_NUMBER; | |
2259 | if (b == CPP_NAME) return CPP_NUMBER; | |
2260 | if (b == CPP_DOT) return CPP_NUMBER; | |
2261 | /* Numbers cannot have length zero, so this is safe. */ | |
2262 | if ((b == CPP_PLUS || b == CPP_MINUS) | |
bfb9dc7f | 2263 | && VALID_SIGN ('+', token1->val.str.text[token1->val.str.len - 1])) |
041c3194 ZW |
2264 | return CPP_NUMBER; |
2265 | break; | |
2266 | ||
ba89d661 ZW |
2267 | case CPP_OTHER: |
2268 | if (CPP_OPTION (pfile, objc) && token1->val.aux == '@') | |
2269 | { | |
2270 | if (b == CPP_NAME) return CPP_NAME; | |
2271 | if (b == CPP_STRING) return CPP_OSTRING; | |
2272 | } | |
2273 | ||
041c3194 ZW |
2274 | default: |
2275 | break; | |
c5a04734 ZW |
2276 | } |
2277 | ||
041c3194 ZW |
2278 | return CPP_EOF; |
2279 | } | |
2280 | ||
2281 | /* Check if TOKEN is to be ##-pasted with the token after it. */ | |
2282 | static const cpp_token * | |
2283 | maybe_paste_with_next (pfile, token) | |
2284 | cpp_reader *pfile; | |
2285 | const cpp_token *token; | |
2286 | { | |
2287 | cpp_token *pasted; | |
2288 | const cpp_token *second; | |
2289 | cpp_context *context = CURRENT_CONTEXT (pfile); | |
2290 | ||
2291 | /* Is this token on the LHS of ## ? */ | |
041c3194 | 2292 | |
417f3e3a ZW |
2293 | while ((token->flags & PASTE_LEFT) |
2294 | || ((context->flags & CONTEXT_PASTEL) | |
2295 | && context->posn == context->count)) | |
c5a04734 | 2296 | { |
417f3e3a ZW |
2297 | /* Suppress macro expansion for next token, but don't conflict |
2298 | with the other method of suppression. If it is an argument, | |
2299 | macro expansion within the argument will still occur. */ | |
2300 | pfile->paste_level = pfile->cur_context; | |
2301 | second = _cpp_get_token (pfile); | |
2302 | pfile->paste_level = 0; | |
a94c1199 | 2303 | context = CURRENT_CONTEXT (pfile); |
417f3e3a ZW |
2304 | |
2305 | /* Ignore placemarker argument tokens (cannot be from an empty | |
2306 | macro since macros are not expanded). */ | |
2307 | if (token->type == CPP_PLACEMARKER) | |
2308 | pasted = duplicate_token (pfile, second); | |
2309 | else if (second->type == CPP_PLACEMARKER) | |
041c3194 | 2310 | { |
5ef865d5 ZW |
2311 | /* GCC has special extended semantics for , ## b where b is |
2312 | a varargs parameter: the comma disappears if b was given | |
2313 | no actual arguments (not merely if b is an empty | |
2314 | argument). */ | |
a94c1199 | 2315 | if (token->type == CPP_COMMA && (context->flags & CONTEXT_VARARGS)) |
6fee6033 | 2316 | pasted = duplicate_token (pfile, second); |
417f3e3a ZW |
2317 | else |
2318 | pasted = duplicate_token (pfile, token); | |
041c3194 ZW |
2319 | } |
2320 | else | |
041c3194 | 2321 | { |
417f3e3a | 2322 | int digraph = 0; |
7de4d004 | 2323 | enum cpp_ttype type = _cpp_can_paste (pfile, token, second, &digraph); |
c5a04734 | 2324 | |
417f3e3a ZW |
2325 | if (type == CPP_EOF) |
2326 | { | |
2327 | if (CPP_OPTION (pfile, warn_paste)) | |
5ef865d5 ZW |
2328 | { |
2329 | /* Do not complain about , ## <whatever> if | |
2330 | <whatever> came from a variable argument, because | |
2331 | the author probably intended the ## to trigger | |
2332 | the special extended semantics (see above). */ | |
d8090680 NB |
2333 | if (token->type == CPP_COMMA |
2334 | && (context->flags & CONTEXT_VARARGS)) | |
5ef865d5 ZW |
2335 | /* no warning */; |
2336 | else | |
2337 | cpp_warning (pfile, | |
417f3e3a | 2338 | "pasting would not give a valid preprocessing token"); |
5ef865d5 | 2339 | } |
417f3e3a | 2340 | _cpp_push_token (pfile, second); |
ff94c747 NB |
2341 | /* A short term hack to safely clear the PASTE_LEFT flag. */ |
2342 | pasted = duplicate_token (pfile, token); | |
2343 | pasted->flags &= ~PASTE_LEFT; | |
2344 | return pasted; | |
417f3e3a | 2345 | } |
c5a04734 | 2346 | |
417f3e3a ZW |
2347 | if (type == CPP_NAME || type == CPP_NUMBER) |
2348 | { | |
2349 | /* Join spellings. */ | |
2350 | U_CHAR *buf, *end; | |
2351 | ||
2352 | pasted = get_temp_token (pfile); | |
2353 | buf = (U_CHAR *) alloca (TOKEN_LEN (token) + TOKEN_LEN (second)); | |
2354 | end = spell_token (pfile, token, buf); | |
2355 | end = spell_token (pfile, second, end); | |
2356 | *end = '\0'; | |
041c3194 | 2357 | |
417f3e3a ZW |
2358 | if (type == CPP_NAME) |
2359 | pasted->val.node = cpp_lookup (pfile, buf, end - buf); | |
2360 | else | |
2361 | { | |
2362 | pasted->val.str.text = uxstrdup (buf); | |
2363 | pasted->val.str.len = end - buf; | |
2364 | } | |
2365 | } | |
ba89d661 ZW |
2366 | else if (type == CPP_WCHAR || type == CPP_WSTRING |
2367 | || type == CPP_OSTRING) | |
417f3e3a | 2368 | pasted = duplicate_token (pfile, second); |
bfb9dc7f ZW |
2369 | else |
2370 | { | |
417f3e3a ZW |
2371 | pasted = get_temp_token (pfile); |
2372 | pasted->val.integer = 0; | |
bfb9dc7f | 2373 | } |
417f3e3a ZW |
2374 | |
2375 | pasted->type = type; | |
2376 | pasted->flags = digraph ? DIGRAPH : 0; | |
92936ecf ZW |
2377 | |
2378 | if (type == CPP_NAME && pasted->val.node->type == T_OPERATOR) | |
2379 | { | |
2380 | pasted->type = pasted->val.node->value.code; | |
2381 | pasted->flags |= NAMED_OP; | |
2382 | } | |
041c3194 ZW |
2383 | } |
2384 | ||
417f3e3a ZW |
2385 | /* The pasted token gets the whitespace flags and position of the |
2386 | first token, the PASTE_LEFT flag of the second token, plus the | |
2387 | PASTED flag to indicate it is the result of a paste. However, we | |
2388 | want to preserve the DIGRAPH flag. */ | |
2389 | pasted->flags &= ~(PREV_WHITE | BOL | PASTE_LEFT); | |
2390 | pasted->flags |= ((token->flags & (PREV_WHITE | BOL)) | |
2391 | | (second->flags & PASTE_LEFT) | PASTED); | |
2392 | pasted->col = token->col; | |
2393 | pasted->line = token->line; | |
2394 | ||
2395 | /* See if there is another token to be pasted onto the one we just | |
2396 | constructed. */ | |
2397 | token = pasted; | |
417f3e3a | 2398 | /* and loop */ |
041c3194 | 2399 | } |
417f3e3a | 2400 | return token; |
041c3194 ZW |
2401 | } |
2402 | ||
2403 | /* Convert a token sequence to a single string token according to the | |
2404 | rules of the ISO C #-operator. */ | |
2405 | #define INIT_SIZE 200 | |
2406 | static cpp_token * | |
2407 | stringify_arg (pfile, token) | |
c5a04734 | 2408 | cpp_reader *pfile; |
041c3194 | 2409 | const cpp_token *token; |
c5a04734 | 2410 | { |
041c3194 ZW |
2411 | cpp_token *result; |
2412 | unsigned char *main_buf; | |
2413 | unsigned int prev_value, backslash_count = 0; | |
2414 | unsigned int buf_used = 0, whitespace = 0, buf_cap = INIT_SIZE; | |
c5a04734 | 2415 | |
417f3e3a | 2416 | push_arg_context (pfile, token); |
041c3194 ZW |
2417 | prev_value = prevent_macro_expansion (pfile); |
2418 | main_buf = (unsigned char *) xmalloc (buf_cap); | |
c5a04734 | 2419 | |
041c3194 ZW |
2420 | result = get_temp_token (pfile); |
2421 | ASSIGN_FLAGS_AND_POS (result, token); | |
2422 | ||
417f3e3a | 2423 | for (; (token = _cpp_get_token (pfile))->type != CPP_EOF; ) |
c5a04734 | 2424 | { |
041c3194 ZW |
2425 | int escape; |
2426 | unsigned char *buf; | |
2427 | unsigned int len = TOKEN_LEN (token); | |
c5a04734 | 2428 | |
96be6998 ZW |
2429 | if (token->type == CPP_PLACEMARKER) |
2430 | continue; | |
2431 | ||
041c3194 ZW |
2432 | escape = (token->type == CPP_STRING || token->type == CPP_WSTRING |
2433 | || token->type == CPP_CHAR || token->type == CPP_WCHAR); | |
2434 | if (escape) | |
2435 | len *= 4 + 1; | |
2436 | ||
2437 | if (buf_used + len > buf_cap) | |
c5a04734 | 2438 | { |
041c3194 ZW |
2439 | buf_cap = buf_used + len + INIT_SIZE; |
2440 | main_buf = xrealloc (main_buf, buf_cap); | |
2441 | } | |
c5a04734 | 2442 | |
041c3194 ZW |
2443 | if (whitespace && (token->flags & PREV_WHITE)) |
2444 | main_buf[buf_used++] = ' '; | |
c5a04734 | 2445 | |
041c3194 ZW |
2446 | if (escape) |
2447 | buf = (unsigned char *) xmalloc (len); | |
2448 | else | |
2449 | buf = main_buf + buf_used; | |
2450 | ||
2451 | len = spell_token (pfile, token, buf) - buf; | |
2452 | if (escape) | |
2453 | { | |
2454 | buf_used = quote_string (&main_buf[buf_used], buf, len) - main_buf; | |
2455 | free (buf); | |
2456 | } | |
2457 | else | |
2458 | buf_used += len; | |
c5a04734 | 2459 | |
041c3194 ZW |
2460 | whitespace = 1; |
2461 | if (token->type == CPP_BACKSLASH) | |
2462 | backslash_count++; | |
2463 | else | |
2464 | backslash_count = 0; | |
2465 | } | |
c5a04734 | 2466 | |
041c3194 ZW |
2467 | /* Ignore the final \ of invalid string literals. */ |
2468 | if (backslash_count & 1) | |
2469 | { | |
2470 | cpp_warning (pfile, "invalid string literal, ignoring final '\\'"); | |
2471 | buf_used--; | |
2472 | } | |
c5a04734 | 2473 | |
041c3194 | 2474 | result->type = CPP_STRING; |
bfb9dc7f ZW |
2475 | result->val.str.text = main_buf; |
2476 | result->val.str.len = buf_used; | |
041c3194 ZW |
2477 | restore_macro_expansion (pfile, prev_value); |
2478 | return result; | |
2479 | } | |
c5a04734 | 2480 | |
041c3194 ZW |
2481 | /* Allocate more room on the context stack of PFILE. */ |
2482 | static void | |
2483 | expand_context_stack (pfile) | |
2484 | cpp_reader *pfile; | |
2485 | { | |
2486 | pfile->context_cap += pfile->context_cap + 20; | |
2487 | pfile->contexts = (cpp_context *) | |
2488 | xrealloc (pfile->contexts, pfile->context_cap * sizeof (cpp_context)); | |
2489 | } | |
c5a04734 | 2490 | |
041c3194 ZW |
2491 | /* Push the context of macro NODE onto the context stack. TOKEN is |
2492 | the CPP_NAME token invoking the macro. */ | |
417f3e3a ZW |
2493 | static int |
2494 | push_macro_context (pfile, token) | |
041c3194 | 2495 | cpp_reader *pfile; |
041c3194 ZW |
2496 | const cpp_token *token; |
2497 | { | |
2498 | unsigned char orig_flags; | |
2499 | macro_args *args; | |
2500 | cpp_context *context; | |
417f3e3a | 2501 | cpp_hashnode *node = token->val.node; |
c5a04734 | 2502 | |
041c3194 ZW |
2503 | /* Token's flags may change when parsing args containing a nested |
2504 | invocation of this macro. */ | |
2505 | orig_flags = token->flags & (PREV_WHITE | BOL); | |
2506 | args = 0; | |
2507 | if (node->value.expansion->paramc >= 0) | |
c5a04734 | 2508 | { |
041c3194 ZW |
2509 | unsigned int error, prev_nme; |
2510 | ||
2511 | /* Allocate room for the argument contexts, and parse them. */ | |
2512 | args = (macro_args *) xmalloc (sizeof (macro_args)); | |
2513 | args->ends = (unsigned int *) | |
2514 | xmalloc (node->value.expansion->paramc * sizeof (unsigned int)); | |
2515 | args->tokens = 0; | |
2516 | args->capacity = 0; | |
2517 | args->used = 0; | |
041c3194 ZW |
2518 | |
2519 | prev_nme = prevent_macro_expansion (pfile); | |
2520 | pfile->args = args; | |
2521 | error = parse_args (pfile, node, args); | |
2522 | pfile->args = 0; | |
2523 | restore_macro_expansion (pfile, prev_nme); | |
2524 | if (error) | |
2525 | { | |
2526 | free_macro_args (args); | |
417f3e3a | 2527 | return 1; |
041c3194 | 2528 | } |
08ebc1c5 NB |
2529 | /* Set the level after the call to parse_args. */ |
2530 | args->level = pfile->cur_context; | |
c5a04734 | 2531 | } |
c5a04734 | 2532 | |
041c3194 ZW |
2533 | /* Now push its context. */ |
2534 | pfile->cur_context++; | |
2535 | if (pfile->cur_context == pfile->context_cap) | |
2536 | expand_context_stack (pfile); | |
2537 | ||
2538 | context = CURRENT_CONTEXT (pfile); | |
2539 | context->u.list = node->value.expansion; | |
2540 | context->args = args; | |
2541 | context->posn = 0; | |
2542 | context->count = context->u.list->tokens_used; | |
2543 | context->level = pfile->cur_context; | |
2544 | context->flags = 0; | |
2545 | context->pushed_token = 0; | |
2546 | ||
2547 | /* Set the flags of the first token. We know there must | |
2548 | be one, empty macros are a single placemarker token. */ | |
2549 | MODIFY_FLAGS_AND_POS (&context->u.list->tokens[0], token, orig_flags); | |
2550 | ||
417f3e3a | 2551 | return 0; |
c5a04734 ZW |
2552 | } |
2553 | ||
041c3194 ZW |
2554 | /* Push an argument to the current macro onto the context stack. |
2555 | TOKEN is the MACRO_ARG token representing the argument expansion. */ | |
417f3e3a | 2556 | static void |
041c3194 ZW |
2557 | push_arg_context (pfile, token) |
2558 | cpp_reader *pfile; | |
2559 | const cpp_token *token; | |
c5a04734 | 2560 | { |
041c3194 ZW |
2561 | cpp_context *context; |
2562 | macro_args *args; | |
2563 | ||
2564 | pfile->cur_context++; | |
2565 | if (pfile->cur_context == pfile->context_cap) | |
2566 | expand_context_stack (pfile); | |
2567 | ||
2568 | context = CURRENT_CONTEXT (pfile); | |
2569 | args = context[-1].args; | |
2570 | ||
2571 | context->count = token->val.aux ? args->ends[token->val.aux - 1]: 0; | |
2572 | context->u.arg = args->tokens + context->count; | |
2573 | context->count = args->ends[token->val.aux] - context->count; | |
2574 | context->args = 0; | |
2575 | context->posn = 0; | |
2576 | context->level = args->level; | |
2577 | context->flags = CONTEXT_ARG | CONTEXT_RAW; | |
a94c1199 NB |
2578 | if ((context[-1].u.list->flags & VAR_ARGS) |
2579 | && token->val.aux + 1 == (unsigned) context[-1].u.list->paramc) | |
2580 | context->flags |= CONTEXT_VARARGS; | |
041c3194 ZW |
2581 | context->pushed_token = 0; |
2582 | ||
2583 | /* Set the flags of the first token. There is one. */ | |
2584 | { | |
2585 | const cpp_token *first = context->u.arg[0]; | |
2586 | if (!first) | |
2587 | first = context->u.arg[1]; | |
c5a04734 | 2588 | |
041c3194 ZW |
2589 | MODIFY_FLAGS_AND_POS ((cpp_token *) first, token, |
2590 | token->flags & (PREV_WHITE | BOL)); | |
2591 | } | |
c5a04734 | 2592 | |
041c3194 ZW |
2593 | if (token->flags & PASTE_LEFT) |
2594 | context->flags |= CONTEXT_PASTEL; | |
2595 | if (pfile->paste_level) | |
2596 | context->flags |= CONTEXT_PASTER; | |
c5a04734 ZW |
2597 | } |
2598 | ||
041c3194 ZW |
2599 | /* "Unget" a token. It is effectively inserted in the token queue and |
2600 | will be returned by the next call to get_raw_token. */ | |
c5a04734 | 2601 | void |
041c3194 | 2602 | _cpp_push_token (pfile, token) |
c5a04734 | 2603 | cpp_reader *pfile; |
041c3194 | 2604 | const cpp_token *token; |
c5a04734 | 2605 | { |
041c3194 | 2606 | cpp_context *context = CURRENT_CONTEXT (pfile); |
96be6998 ZW |
2607 | |
2608 | if (context->posn > 0) | |
2609 | { | |
2610 | const cpp_token *prev; | |
2611 | if (IS_ARG_CONTEXT (context)) | |
2612 | prev = context->u.arg[context->posn - 1]; | |
2613 | else | |
2614 | prev = &context->u.list->tokens[context->posn - 1]; | |
2615 | ||
2616 | if (prev == token) | |
2617 | { | |
2618 | context->posn--; | |
2619 | return; | |
2620 | } | |
2621 | } | |
2622 | ||
041c3194 ZW |
2623 | if (context->pushed_token) |
2624 | cpp_ice (pfile, "two tokens pushed in a row"); | |
2625 | if (token->type != CPP_EOF) | |
2626 | context->pushed_token = token; | |
2627 | /* Don't push back a directive's CPP_EOF, step back instead. */ | |
2628 | else if (pfile->cur_context == 0) | |
2629 | pfile->contexts[0].posn--; | |
2630 | } | |
c5a04734 | 2631 | |
041c3194 ZW |
2632 | /* Handle a preprocessing directive. TOKEN is the CPP_HASH token |
2633 | introducing the directive. */ | |
7de4d004 NB |
2634 | void |
2635 | _cpp_process_directive (pfile, token) | |
041c3194 ZW |
2636 | cpp_reader *pfile; |
2637 | const cpp_token *token; | |
2638 | { | |
2639 | const struct directive *d = pfile->token_list.directive; | |
2640 | int prev_nme = 0; | |
2641 | ||
2642 | /* Skip over the directive name. */ | |
2643 | if (token[1].type == CPP_NAME) | |
2644 | _cpp_get_raw_token (pfile); | |
2645 | else if (token[1].type != CPP_NUMBER) | |
96be6998 | 2646 | cpp_ice (pfile, "directive begins with %s?!", TOKEN_NAME (token)); |
041c3194 | 2647 | |
041c3194 ZW |
2648 | if (! (d->flags & EXPAND)) |
2649 | prev_nme = prevent_macro_expansion (pfile); | |
2650 | (void) (*d->handler) (pfile); | |
2651 | if (! (d->flags & EXPAND)) | |
2652 | restore_macro_expansion (pfile, prev_nme); | |
2653 | _cpp_skip_rest_of_line (pfile); | |
2654 | } | |
c5a04734 | 2655 | |
041c3194 ZW |
2656 | /* The external interface to return the next token. All macro |
2657 | expansion and directive processing is handled internally, the | |
2658 | caller only ever sees the output after preprocessing. */ | |
2659 | const cpp_token * | |
2660 | cpp_get_token (pfile) | |
2661 | cpp_reader *pfile; | |
2662 | { | |
2663 | const cpp_token *token; | |
417f3e3a | 2664 | /* Loop till we hit a non-directive, non-placemarker token. */ |
041c3194 ZW |
2665 | for (;;) |
2666 | { | |
417f3e3a ZW |
2667 | token = _cpp_get_token (pfile); |
2668 | ||
2669 | if (token->type == CPP_PLACEMARKER) | |
2670 | continue; | |
2671 | ||
2672 | if (token->type == CPP_HASH && token->flags & BOL | |
041c3194 | 2673 | && pfile->token_list.directive) |
c5a04734 | 2674 | { |
7de4d004 | 2675 | _cpp_process_directive (pfile, token); |
041c3194 | 2676 | continue; |
c5a04734 ZW |
2677 | } |
2678 | ||
417f3e3a ZW |
2679 | return token; |
2680 | } | |
2681 | } | |
2682 | ||
2683 | /* The internal interface to return the next token. There are two | |
2684 | differences between the internal and external interfaces: the | |
2685 | internal interface may return a PLACEMARKER token, and it does not | |
2686 | process directives. */ | |
2687 | const cpp_token * | |
2688 | _cpp_get_token (pfile) | |
2689 | cpp_reader *pfile; | |
2690 | { | |
6ead1e99 | 2691 | const cpp_token *token, *old_token; |
417f3e3a ZW |
2692 | cpp_hashnode *node; |
2693 | ||
2694 | /* Loop until we hit a non-macro token. */ | |
2695 | for (;;) | |
2696 | { | |
2697 | token = get_raw_token (pfile); | |
2698 | ||
041c3194 ZW |
2699 | /* Short circuit EOF. */ |
2700 | if (token->type == CPP_EOF) | |
2701 | return token; | |
417f3e3a ZW |
2702 | |
2703 | /* If we are skipping... */ | |
2704 | if (pfile->skipping) | |
c5a04734 | 2705 | { |
417f3e3a ZW |
2706 | /* we still have to process directives, */ |
2707 | if (pfile->token_list.directive) | |
2708 | return token; | |
2709 | ||
2710 | /* but everything else is ignored. */ | |
041c3194 ZW |
2711 | _cpp_skip_rest_of_line (pfile); |
2712 | continue; | |
2713 | } | |
c5a04734 | 2714 | |
417f3e3a ZW |
2715 | /* If there's a potential control macro and we get here, then that |
2716 | #ifndef didn't cover the entire file and its argument shouldn't | |
2717 | be taken as a control macro. */ | |
2718 | pfile->potential_control_macro = 0; | |
c5a04734 | 2719 | |
bbdac7d0 ZW |
2720 | /* If we are rescanning preprocessed input, no macro expansion or |
2721 | token pasting may occur. */ | |
2722 | if (CPP_OPTION (pfile, preprocessed)) | |
2723 | return token; | |
2724 | ||
6ead1e99 ZW |
2725 | old_token = token; |
2726 | ||
417f3e3a ZW |
2727 | /* See if there's a token to paste with this one. */ |
2728 | if (!pfile->paste_level) | |
2729 | token = maybe_paste_with_next (pfile, token); | |
c5a04734 | 2730 | |
417f3e3a | 2731 | /* If it isn't a macro, return it now. */ |
92936ecf | 2732 | if (token->type != CPP_NAME || token->val.node->type == T_VOID) |
417f3e3a | 2733 | return token; |
c5a04734 | 2734 | |
92936ecf | 2735 | /* Is macro expansion disabled in general, or are we in the |
6ead1e99 ZW |
2736 | middle of a token paste, or was this token just pasted? |
2737 | (Note we don't check token->flags & PASTED, because that | |
2738 | counts tokens that were pasted at some point in the past, | |
2739 | we're only interested in tokens that were pasted by this call | |
2740 | to maybe_paste_with_next.) */ | |
2741 | if (pfile->no_expand_level == pfile->cur_context | |
2742 | || pfile->paste_level | |
2743 | || (token != old_token | |
2744 | && pfile->no_expand_level + 1 == pfile->cur_context)) | |
417f3e3a | 2745 | return token; |
6ead1e99 | 2746 | |
417f3e3a ZW |
2747 | node = token->val.node; |
2748 | if (node->type != T_MACRO) | |
2749 | return special_symbol (pfile, node, token); | |
c5a04734 | 2750 | |
041c3194 ZW |
2751 | if (is_macro_disabled (pfile, node->value.expansion, token)) |
2752 | return token; | |
c5a04734 | 2753 | |
417f3e3a ZW |
2754 | if (push_macro_context (pfile, token)) |
2755 | return token; | |
2756 | /* else loop */ | |
041c3194 | 2757 | } |
041c3194 | 2758 | } |
c5a04734 | 2759 | |
041c3194 ZW |
2760 | /* Returns the next raw token, i.e. without performing macro |
2761 | expansion. Argument contexts are automatically entered. */ | |
2762 | static const cpp_token * | |
2763 | get_raw_token (pfile) | |
2764 | cpp_reader *pfile; | |
2765 | { | |
2766 | const cpp_token *result; | |
417f3e3a | 2767 | cpp_context *context; |
c5a04734 | 2768 | |
417f3e3a | 2769 | for (;;) |
041c3194 | 2770 | { |
417f3e3a ZW |
2771 | context = CURRENT_CONTEXT (pfile); |
2772 | if (context->pushed_token) | |
041c3194 | 2773 | { |
417f3e3a ZW |
2774 | result = context->pushed_token; |
2775 | context->pushed_token = 0; | |
6fee6033 | 2776 | return result; /* Cannot be a CPP_MACRO_ARG */ |
417f3e3a ZW |
2777 | } |
2778 | else if (context->posn == context->count) | |
2779 | { | |
2780 | if (pop_context (pfile)) | |
2781 | return &eof_token; | |
2782 | continue; | |
2783 | } | |
6fee6033 | 2784 | else if (IS_ARG_CONTEXT (context)) |
417f3e3a | 2785 | { |
6fee6033 ZW |
2786 | result = context->u.arg[context->posn++]; |
2787 | if (result == 0) | |
c5a04734 | 2788 | { |
6fee6033 | 2789 | context->flags ^= CONTEXT_RAW; |
041c3194 | 2790 | result = context->u.arg[context->posn++]; |
c5a04734 | 2791 | } |
6fee6033 | 2792 | return result; /* Cannot be a CPP_MACRO_ARG */ |
041c3194 | 2793 | } |
c5a04734 | 2794 | |
6fee6033 ZW |
2795 | result = &context->u.list->tokens[context->posn++]; |
2796 | ||
417f3e3a ZW |
2797 | if (result->type != CPP_MACRO_ARG) |
2798 | return result; | |
2799 | ||
2800 | if (result->flags & STRINGIFY_ARG) | |
2801 | return stringify_arg (pfile, result); | |
2802 | ||
2803 | push_arg_context (pfile, result); | |
2804 | } | |
041c3194 | 2805 | } |
c5a04734 | 2806 | |
041c3194 ZW |
2807 | /* Internal interface to get the token without macro expanding. */ |
2808 | const cpp_token * | |
2809 | _cpp_get_raw_token (pfile) | |
2810 | cpp_reader *pfile; | |
2811 | { | |
2812 | int prev_nme = prevent_macro_expansion (pfile); | |
417f3e3a | 2813 | const cpp_token *result = _cpp_get_token (pfile); |
041c3194 ZW |
2814 | restore_macro_expansion (pfile, prev_nme); |
2815 | return result; | |
2816 | } | |
c5a04734 | 2817 | |
041c3194 ZW |
2818 | /* A thin wrapper to lex_line. CLEAR is non-zero if the current token |
2819 | list should be overwritten, or zero if we need to append | |
2820 | (typically, if we are within the arguments to a macro, or looking | |
2821 | for the '(' to start a function-like macro invocation). */ | |
2822 | static int | |
2823 | lex_next (pfile, clear) | |
2824 | cpp_reader *pfile; | |
2825 | int clear; | |
2826 | { | |
2827 | cpp_toklist *list = &pfile->token_list; | |
2828 | const cpp_token *old_list = list->tokens; | |
2829 | unsigned int old_used = list->tokens_used; | |
c5a04734 | 2830 | |
041c3194 | 2831 | if (clear) |
c5a04734 | 2832 | { |
041c3194 ZW |
2833 | /* Release all temporary tokens. */ |
2834 | _cpp_clear_toklist (list); | |
2835 | pfile->contexts[0].posn = 0; | |
2836 | if (pfile->temp_used) | |
2837 | release_temp_tokens (pfile); | |
c5a04734 | 2838 | } |
041c3194 ZW |
2839 | lex_line (pfile, list); |
2840 | pfile->contexts[0].count = list->tokens_used; | |
c5a04734 | 2841 | |
041c3194 | 2842 | if (!clear && pfile->args) |
c5a04734 | 2843 | { |
041c3194 ZW |
2844 | /* Fix up argument token pointers. */ |
2845 | if (old_list != list->tokens) | |
2846 | { | |
2847 | unsigned int i; | |
2848 | ||
2849 | for (i = 0; i < pfile->args->used; i++) | |
2850 | { | |
2851 | const cpp_token *token = pfile->args->tokens[i]; | |
2852 | if (token >= old_list && token < old_list + old_used) | |
2853 | pfile->args->tokens[i] = (const cpp_token *) | |
2854 | ((char *) token + ((char *) list->tokens - (char *) old_list)); | |
2855 | } | |
2856 | } | |
2857 | ||
2858 | /* 6.10.3 paragraph 11: If there are sequences of preprocessing | |
2859 | tokens within the list of arguments that would otherwise act as | |
2860 | preprocessing directives, the behavior is undefined. | |
2861 | ||
2862 | This implementation will report a hard error and treat the | |
2863 | 'sequence of preprocessing tokens' as part of the macro argument, | |
2864 | not a directive. | |
2865 | ||
2866 | Note if pfile->args == 0, we're OK since we're only inside a | |
2867 | macro argument after a '('. */ | |
2868 | if (list->directive) | |
2869 | { | |
2870 | cpp_error_with_line (pfile, list->tokens[old_used].line, | |
2871 | list->tokens[old_used].col, | |
2872 | "#%s may not be used inside a macro argument", | |
2873 | list->directive->name); | |
91fcd158 | 2874 | return 1; |
041c3194 | 2875 | } |
c5a04734 ZW |
2876 | } |
2877 | ||
041c3194 | 2878 | return 0; |
c5a04734 ZW |
2879 | } |
2880 | ||
417f3e3a ZW |
2881 | /* Pops a context off the context stack. If we're at the bottom, lexes |
2882 | the next logical line. Returns EOF if we're at the end of the | |
5ef865d5 | 2883 | argument list to the # operator, or we should not "overflow" |
041c3194 ZW |
2884 | into the rest of the file (e.g. 6.10.3.1.1). */ |
2885 | static int | |
417f3e3a | 2886 | pop_context (pfile) |
041c3194 ZW |
2887 | cpp_reader *pfile; |
2888 | { | |
2889 | cpp_context *context; | |
3fef5b2b | 2890 | |
041c3194 | 2891 | if (pfile->cur_context == 0) |
417f3e3a ZW |
2892 | { |
2893 | /* If we are currently processing a directive, do not advance. 6.10 | |
2894 | paragraph 2: A new-line character ends the directive even if it | |
2895 | occurs within what would otherwise be an invocation of a | |
2896 | function-like macro. */ | |
2897 | if (pfile->token_list.directive) | |
2898 | return 1; | |
2899 | ||
2900 | return lex_next (pfile, pfile->no_expand_level == UINT_MAX); | |
2901 | } | |
041c3194 ZW |
2902 | |
2903 | /* Argument contexts, when parsing args or handling # operator | |
2904 | return CPP_EOF at the end. */ | |
2905 | context = CURRENT_CONTEXT (pfile); | |
2906 | if (IS_ARG_CONTEXT (context) && pfile->cur_context == pfile->no_expand_level) | |
2907 | return 1; | |
2908 | ||
2909 | /* Free resources when leaving macro contexts. */ | |
2910 | if (context->args) | |
2911 | free_macro_args (context->args); | |
2912 | ||
2913 | if (pfile->cur_context == pfile->no_expand_level) | |
2914 | pfile->no_expand_level--; | |
2915 | pfile->cur_context--; | |
2916 | ||
2917 | return 0; | |
2918 | } | |
2919 | ||
041c3194 ZW |
2920 | /* Turn off macro expansion at the current context level. */ |
2921 | static unsigned int | |
2922 | prevent_macro_expansion (pfile) | |
2923 | cpp_reader *pfile; | |
2924 | { | |
2925 | unsigned int prev_value = pfile->no_expand_level; | |
2926 | pfile->no_expand_level = pfile->cur_context; | |
2927 | return prev_value; | |
2928 | } | |
2929 | ||
2930 | /* Restore macro expansion to its previous state. */ | |
2931 | static void | |
2932 | restore_macro_expansion (pfile, prev_value) | |
2933 | cpp_reader *pfile; | |
2934 | unsigned int prev_value; | |
2935 | { | |
2936 | pfile->no_expand_level = prev_value; | |
2937 | } | |
2938 | ||
2939 | /* Used by cpperror.c to obtain the correct line and column to report | |
2940 | in a diagnostic. */ | |
2941 | unsigned int | |
2942 | _cpp_get_line (pfile, pcol) | |
2943 | cpp_reader *pfile; | |
2944 | unsigned int *pcol; | |
2945 | { | |
2946 | unsigned int index; | |
2947 | const cpp_token *cur_token; | |
2948 | ||
0d9f234d | 2949 | if (pfile->state.in_lex_line) |
041c3194 ZW |
2950 | index = pfile->token_list.tokens_used; |
2951 | else | |
6ead1e99 | 2952 | { |
0d9f234d NB |
2953 | index = pfile->contexts[0].posn; |
2954 | ||
2955 | if (index == 0) | |
2956 | { | |
2957 | if (pcol) | |
2958 | *pcol = 0; | |
2959 | return 0; | |
2960 | } | |
2961 | index--; | |
6ead1e99 ZW |
2962 | } |
2963 | ||
0d9f234d | 2964 | cur_token = &pfile->token_list.tokens[index]; |
041c3194 ZW |
2965 | if (pcol) |
2966 | *pcol = cur_token->col; | |
2967 | return cur_token->line; | |
2968 | } | |
2969 | ||
2970 | #define DSC(str) (const U_CHAR *)str, sizeof str - 1 | |
2971 | static const char * const monthnames[] = | |
2972 | { | |
2973 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
2974 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", | |
2975 | }; | |
2976 | ||
2977 | /* Handle builtin macros like __FILE__. */ | |
2978 | static const cpp_token * | |
2979 | special_symbol (pfile, node, token) | |
2980 | cpp_reader *pfile; | |
2981 | cpp_hashnode *node; | |
d1d9a6bd | 2982 | const cpp_token *token; |
3fef5b2b | 2983 | { |
041c3194 ZW |
2984 | cpp_token *result; |
2985 | cpp_buffer *ip; | |
3fef5b2b | 2986 | |
041c3194 | 2987 | switch (node->type) |
3fef5b2b | 2988 | { |
041c3194 ZW |
2989 | case T_FILE: |
2990 | case T_BASE_FILE: | |
3fef5b2b | 2991 | { |
041c3194 | 2992 | const char *file; |
3fef5b2b | 2993 | |
041c3194 ZW |
2994 | ip = CPP_BUFFER (pfile); |
2995 | if (ip == 0) | |
2996 | file = ""; | |
3fef5b2b | 2997 | else |
041c3194 ZW |
2998 | { |
2999 | if (node->type == T_BASE_FILE) | |
3000 | while (CPP_PREV_BUFFER (ip) != NULL) | |
3001 | ip = CPP_PREV_BUFFER (ip); | |
3002 | ||
3003 | file = ip->nominal_fname; | |
3004 | } | |
3005 | result = make_string_token (get_temp_token (pfile), (U_CHAR *) file, | |
3006 | strlen (file)); | |
3007 | } | |
3008 | break; | |
3fef5b2b | 3009 | |
041c3194 | 3010 | case T_INCLUDE_LEVEL: |
f9a0e96c ZW |
3011 | /* pfile->include_depth counts the primary source as level 1, |
3012 | but historically __INCLUDE_DEPTH__ has called the primary | |
3013 | source level 0. */ | |
3014 | result = alloc_number_token (pfile, pfile->include_depth - 1); | |
3fef5b2b NB |
3015 | break; |
3016 | ||
041c3194 ZW |
3017 | case T_SPECLINE: |
3018 | /* If __LINE__ is embedded in a macro, it must expand to the | |
3019 | line of the macro's invocation, not its definition. | |
3020 | Otherwise things like assert() will not work properly. */ | |
3021 | result = alloc_number_token (pfile, _cpp_get_line (pfile, NULL)); | |
5d7ee2fa NB |
3022 | break; |
3023 | ||
041c3194 | 3024 | case T_STDC: |
3fef5b2b | 3025 | { |
041c3194 | 3026 | int stdc = 1; |
3fef5b2b | 3027 | |
041c3194 ZW |
3028 | #ifdef STDC_0_IN_SYSTEM_HEADERS |
3029 | if (CPP_IN_SYSTEM_HEADER (pfile) | |
bfb9dc7f | 3030 | && pfile->spec_nodes->n__STRICT_ANSI__->type == T_VOID) |
041c3194 ZW |
3031 | stdc = 0; |
3032 | #endif | |
3033 | result = alloc_number_token (pfile, stdc); | |
3fef5b2b NB |
3034 | } |
3035 | break; | |
3036 | ||
041c3194 ZW |
3037 | case T_DATE: |
3038 | case T_TIME: | |
3039 | if (pfile->date == 0) | |
3040 | { | |
3041 | /* Allocate __DATE__ and __TIME__ from permanent storage, | |
3042 | and save them in pfile so we don't have to do this again. | |
3043 | We don't generate these strings at init time because | |
3044 | time() and localtime() are very slow on some systems. */ | |
3045 | time_t tt = time (NULL); | |
3046 | struct tm *tb = localtime (&tt); | |
3047 | ||
3048 | pfile->date = make_string_token | |
3049 | ((cpp_token *) xmalloc (sizeof (cpp_token)), DSC("Oct 11 1347")); | |
3050 | pfile->time = make_string_token | |
3051 | ((cpp_token *) xmalloc (sizeof (cpp_token)), DSC("12:34:56")); | |
3052 | ||
bfb9dc7f | 3053 | sprintf ((char *) pfile->date->val.str.text, "%s %2d %4d", |
041c3194 | 3054 | monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900); |
bfb9dc7f | 3055 | sprintf ((char *) pfile->time->val.str.text, "%02d:%02d:%02d", |
041c3194 ZW |
3056 | tb->tm_hour, tb->tm_min, tb->tm_sec); |
3057 | } | |
3058 | result = node->type == T_DATE ? pfile->date: pfile->time; | |
3fef5b2b NB |
3059 | break; |
3060 | ||
041c3194 | 3061 | case T_POISON: |
bfb9dc7f | 3062 | cpp_error (pfile, "attempt to use poisoned \"%s\"", node->name); |
041c3194 ZW |
3063 | return token; |
3064 | ||
3065 | default: | |
3066 | cpp_ice (pfile, "invalid special hash type"); | |
3067 | return token; | |
3fef5b2b NB |
3068 | } |
3069 | ||
041c3194 ZW |
3070 | ASSIGN_FLAGS_AND_POS (result, token); |
3071 | return result; | |
3072 | } | |
3073 | #undef DSC | |
3074 | ||
61d0346d | 3075 | /* Allocate pfile->input_buffer, and initialize _cpp_trigraph_map[] |
041c3194 ZW |
3076 | if it hasn't happened already. */ |
3077 | ||
3078 | void | |
3079 | _cpp_init_input_buffer (pfile) | |
3080 | cpp_reader *pfile; | |
3081 | { | |
417f3e3a ZW |
3082 | cpp_context *base; |
3083 | ||
cbcff6df | 3084 | _cpp_init_toklist (&pfile->token_list, 0); |
417f3e3a | 3085 | pfile->no_expand_level = UINT_MAX; |
041c3194 | 3086 | pfile->context_cap = 20; |
041c3194 | 3087 | pfile->cur_context = 0; |
041c3194 | 3088 | |
417f3e3a ZW |
3089 | pfile->contexts = (cpp_context *) |
3090 | xmalloc (pfile->context_cap * sizeof (cpp_context)); | |
041c3194 | 3091 | |
417f3e3a ZW |
3092 | /* Clear the base context. */ |
3093 | base = &pfile->contexts[0]; | |
3094 | base->u.list = &pfile->token_list; | |
3095 | base->posn = 0; | |
3096 | base->count = 0; | |
3097 | base->args = 0; | |
3098 | base->level = 0; | |
3099 | base->flags = 0; | |
3100 | base->pushed_token = 0; | |
041c3194 ZW |
3101 | } |
3102 | ||
3103 | /* Moves to the end of the directive line, popping contexts as | |
3104 | necessary. */ | |
3105 | void | |
3106 | _cpp_skip_rest_of_line (pfile) | |
3107 | cpp_reader *pfile; | |
3108 | { | |
417f3e3a ZW |
3109 | /* Discard all stacked contexts. */ |
3110 | int i; | |
3111 | for (i = pfile->cur_context; i > 0; i--) | |
3112 | if (pfile->contexts[i].args) | |
3113 | free_macro_args (pfile->contexts[i].args); | |
3114 | ||
3115 | if (pfile->no_expand_level <= pfile->cur_context) | |
3116 | pfile->no_expand_level = 0; | |
3117 | pfile->cur_context = 0; | |
041c3194 | 3118 | |
417f3e3a ZW |
3119 | /* Clear the base context, and clear the directive pointer so that |
3120 | get_raw_token will advance to the next line. */ | |
3121 | pfile->contexts[0].count = 0; | |
3122 | pfile->contexts[0].posn = 0; | |
041c3194 | 3123 | pfile->token_list.directive = 0; |
c5a04734 ZW |
3124 | } |
3125 | ||
041c3194 ZW |
3126 | /* Directive handler wrapper used by the command line option |
3127 | processor. */ | |
3128 | void | |
2c8f0515 | 3129 | _cpp_run_directive (pfile, dir, buf, count, name) |
041c3194 ZW |
3130 | cpp_reader *pfile; |
3131 | const struct directive *dir; | |
3132 | const char *buf; | |
3133 | size_t count; | |
2c8f0515 | 3134 | const char *name; |
041c3194 ZW |
3135 | { |
3136 | if (cpp_push_buffer (pfile, (const U_CHAR *)buf, count) != NULL) | |
3137 | { | |
3138 | unsigned int prev_lvl = 0; | |
417f3e3a | 3139 | |
2c8f0515 ZW |
3140 | if (name) |
3141 | CPP_BUFFER (pfile)->nominal_fname = name; | |
3142 | else | |
3143 | CPP_BUFFER (pfile)->nominal_fname = _("<command line>"); | |
3144 | CPP_BUFFER (pfile)->lineno = (unsigned int)-1; | |
3145 | ||
417f3e3a ZW |
3146 | /* Scan the line now, else prevent_macro_expansion won't work. */ |
3147 | lex_next (pfile, 1); | |
041c3194 ZW |
3148 | if (! (dir->flags & EXPAND)) |
3149 | prev_lvl = prevent_macro_expansion (pfile); | |
3150 | ||
3151 | (void) (*dir->handler) (pfile); | |
3152 | ||
3153 | if (! (dir->flags & EXPAND)) | |
3154 | restore_macro_expansion (pfile, prev_lvl); | |
3155 | ||
3156 | _cpp_skip_rest_of_line (pfile); | |
3157 | cpp_pop_buffer (pfile); | |
3158 | } | |
3159 | } |