| blob | eae546516c6a60e9eeec9109ba9465d12e13fbe8 |
1 /* -*-C-*-
2 * Wrc preprocessor lexical analysis
3 *
4 * Copyright 1999-2000 Bertho A. Stultiens (BS)
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 *
20 * History:
21 * 24-Apr-2000 BS - Started from scratch to restructure everything
22 * and reintegrate the source into the wine-tree.
23 * 04-Jan-2000 BS - Added comments about the lexicographical
24 * grammar to give some insight in the complexity.
25 * 28-Dec-1999 BS - Eliminated backing-up of the flexer by running
26 * `flex -b' on the source. This results in some
27 * weirdo extra rules, but a much faster scanner.
28 * 23-Dec-1999 BS - Started this file
29 *
30 *-------------------------------------------------------------------------
31 * The preprocessor's lexographical grammar (approximately):
32 *
33 * pp := {ws} # {ws} if {ws} {expr} {ws} \n
34 * | {ws} # {ws} ifdef {ws} {id} {ws} \n
35 * | {ws} # {ws} ifndef {ws} {id} {ws} \n
36 * | {ws} # {ws} elif {ws} {expr} {ws} \n
37 * | {ws} # {ws} else {ws} \n
38 * | {ws} # {ws} endif {ws} \n
39 * | {ws} # {ws} include {ws} < {anytext} > \n
40 * | {ws} # {ws} include {ws} " {anytext} " \n
41 * | {ws} # {ws} define {ws} {anytext} \n
42 * | {ws} # {ws} define( {arglist} ) {ws} {expansion} \n
43 * | {ws} # {ws} pragma {ws} {anytext} \n
44 * | {ws} # {ws} ident {ws} {anytext} \n
45 * | {ws} # {ws} error {ws} {anytext} \n
46 * | {ws} # {ws} warning {ws} {anytext} \n
47 * | {ws} # {ws} line {ws} " {anytext} " {number} \n
48 * | {ws} # {ws} {number} " {anytext} " {number} [ {number} [{number}] ] \n
49 * | {ws} # {ws} \n
50 *
51 * ws := [ \t\r\f\v]*
52 *
53 * expr := {expr} [+-*%^/|&] {expr}
54 * | {expr} {logor|logand} {expr}
55 * | [!~+-] {expr}
56 * | {expr} ? {expr} : {expr}
57 *
58 * logor := ||
59 *
60 * logand := &&
61 *
62 * id := [a-zA-Z_][a-zA-Z0-9_]*
63 *
64 * anytext := [^\n]* (see note)
65 *
66 * arglist :=
67 * | {id}
68 * | {arglist} , {id}
69 * | {arglist} , {id} ...
70 *
71 * expansion := {id}
72 * | # {id}
73 * | {anytext}
74 * | {anytext} ## {anytext}
75 *
76 * number := [0-9]+
77 *
78 * Note: "anytext" is not always "[^\n]*". This is because the
79 * trailing context must be considered as well.
80 *
81 * The only certain assumption for the preprocessor to make is that
82 * directives start at the beginning of the line, followed by a '#'
83 * and end with a newline.
84 * Any directive may be suffixed with a line-continuation. Also
85 * classical comment / *...* / (note: no comments within comments,
86 * therefore spaces) is considered to be a line-continuation
87 * (according to gcc and egcs AFAIK, ANSI is a bit vague).
88 * Comments have not been added to the above grammar for simplicity
89 * reasons. However, it is allowed to enter comment anywhere within
90 * the directives as long as they do not interfere with the context.
91 * All comments are considered to be deletable whitespace (both
92 * classical form "/ *...* /" and C++ form "//...\n").
93 *
94 * All recursive scans, except for macro-expansion, are done by the
95 * parser, whereas the simple state transitions of non-recursive
96 * directives are done in the scanner. This results in the many
97 * exclusive start-conditions of the scanner.
98 *
99 * Macro expansions are slightly more difficult because they have to
100 * prescan the arguments. Parameter substitution is literal if the
101 * substitution is # or ## (either side). This enables new identifiers
102 * to be created (see 'info cpp' node Macro|Pitfalls|Prescan for more
103 * information).
104 *
105 * FIXME: Variable macro parameters is recognized, but not yet
106 * expanded. I have to reread the ANSI standard on the subject (yes,
107 * ANSI defines it).
108 *
109 * The following special defines are supported:
110 * __FILE__ -> "thissource.c"
111 * __LINE__ -> 123
112 * __DATE__ -> "May 1 2000"
113 * __TIME__ -> "23:59:59"
114 * These macros expand, as expected, into their ANSI defined values.
115 *
116 * The same include prevention is implemented as gcc and egcs does.
117 * This results in faster processing because we do not read the text
118 * at all. Some wine-sources attempt to include the same file 4 or 5
119 * times. This strategy also saves a lot blank output-lines, which in
120 * its turn improves the real resource scanner/parser.
121 *
122 */
124 /*
125 * Special flex options and exclusive scanner start-conditions
126 */
127 %option stack
128 %option 8bit never-interactive
129 %option nounput
130 %option prefix="ppy_"
132 %x pp_pp
133 %x pp_eol
134 %x pp_inc
135 %x pp_dqs
136 %x pp_sqs
137 %x pp_iqs
138 %x pp_comment
139 %x pp_def
140 %x pp_define
141 %x pp_macro
142 %x pp_mbody
143 %x pp_macign
144 %x pp_macscan
145 %x pp_macexp
146 %x pp_if
147 %x pp_ifd
148 %x pp_endif
149 %x pp_line
150 %x pp_defined
151 %x pp_ignore
152 %x RCINCL
154 ws [ \v\f\t\r]
155 cident [a-zA-Z_][0-9a-zA-Z_]*
156 ul [uUlL]|[uUlL][lL]|[lL][uU]|[lL][lL][uU]|[uU][lL][lL]|[lL][uU][lL]
158 %{
159 #include <config.h>
160 #include <stdio.h>
161 #include <stdlib.h>
162 #include <string.h>
163 #include <ctype.h>
164 #include <assert.h>
166 #include "wpp_private.h"
167 #include "ppy.tab.h"
169 /*
170 * Make sure that we are running an appropriate version of flex.
171 */
172 #if !defined(YY_FLEX_MAJOR_VERSION) || (1000 * YY_FLEX_MAJOR_VERSION + YY_FLEX_MINOR_VERSION < 2005)
173 #error Must use flex version 2.5.1 or higher (yy_scan_* routines are required).
174 #endif
176 #define YY_READ_BUF_SIZE 65536 /* So we read most of a file at once */
178 #define yy_current_state() YY_START
179 #define yy_pp_state(x) yy_pop_state(); yy_push_state(x)
181 /*
182 * Always update the current character position within a line
183 */
184 #define YY_USER_ACTION pp_status.char_number+=ppy_leng;
186 /*
187 * Buffer management for includes and expansions
188 */
189 #define MAXBUFFERSTACK 128 /* Nesting more than 128 includes or macro expansion textss is insane */
191 typedef struct bufferstackentry {
192 YY_BUFFER_STATE bufferstate; /* Buffer to switch back to */
193 pp_entry_t *define; /* Points to expanding define or NULL if handling includes */
194 int line_number; /* Line that we were handling */
195 int char_number; /* The current position on that line */
196 const char *filename; /* Filename that we were handling */
197 int if_depth; /* How many #if:s deep to check matching #endif:s */
198 int ncontinuations; /* Remember the continuation state */
199 int should_pop; /* Set if we must pop the start-state on EOF */
200 /* Include management */
201 include_state_t incl;
202 char *include_filename;
203 } bufferstackentry_t;
205 #define ALLOCBLOCKSIZE (1 << 10) /* Allocate these chunks at a time for string-buffers */
207 /*
208 * Macro expansion nesting
209 * We need the stack to handle expansions while scanning
210 * a macro's arguments. The TOS must always be the macro
211 * that receives the current expansion from the scanner.
212 */
213 #define MAXMACEXPSTACK 128 /* Nesting more than 128 macro expansions is insane */
215 typedef struct macexpstackentry {
216 pp_entry_t *ppp; /* This macro we are scanning */
217 char **args; /* With these arguments */
218 char **ppargs; /* Resulting in these preprocessed arguments */
219 int *nnls; /* Number of newlines per argument */
220 int nargs; /* And this many arguments scanned */
221 int parentheses; /* Nesting level of () */
222 int curargsize; /* Current scanning argument's size */
223 int curargalloc; /* Current scanning argument's block allocated */
224 char *curarg; /* Current scanning argument's content */
225 } macexpstackentry_t;
227 #define MACROPARENTHESES() (top_macro()->parentheses)
229 /*
230 * Prototypes
231 */
232 static void newline(int);
233 static int make_number(int radix, YYSTYPE *val, const char *str, int len);
234 static void put_buffer(const char *s, int len);
235 /* Buffer management */
236 static void push_buffer(pp_entry_t *ppp, char *filename, char *incname, int pop);
237 static bufferstackentry_t *pop_buffer(void);
238 /* String functions */
239 static void new_string(void);
240 static void add_string(const char *str, int len);
241 static char *get_string(void);
242 static void put_string(void);
243 static int string_start(void);
244 /* Macro functions */
245 static void push_macro(pp_entry_t *ppp);
246 static macexpstackentry_t *top_macro(void);
247 static macexpstackentry_t *pop_macro(void);
248 static void free_macro(macexpstackentry_t *mep);
249 static void add_text_to_macro(const char *text, int len);
250 static void macro_add_arg(int last);
251 static void macro_add_expansion(void);
252 /* Expansion */
253 static void expand_special(pp_entry_t *ppp);
254 static void expand_define(pp_entry_t *ppp);
255 static void expand_macro(macexpstackentry_t *mep);
257 /*
258 * Local variables
259 */
260 static int ncontinuations;
262 static int strbuf_idx = 0;
263 static int strbuf_alloc = 0;
264 static char *strbuffer = NULL;
265 static int str_startline;
267 static macexpstackentry_t *macexpstack[MAXMACEXPSTACK];
268 static int macexpstackidx = 0;
270 static bufferstackentry_t bufferstack[MAXBUFFERSTACK];
271 static int bufferstackidx = 0;
273 /*
274 * Global variables
275 */
276 include_state_t pp_incl_state =
277 {
278 -1, /* state */
279 NULL, /* ppp */
280 0, /* ifdepth */
281 0 /* seen_junk */
282 };
284 includelogicentry_t *pp_includelogiclist = NULL;
286 %}
288 /*
289 **************************************************************************
290 * The scanner starts here
291 **************************************************************************
292 */
294 %%
295 /*
296 * Catch line-continuations.
297 * Note: Gcc keeps the line-continuations in, for example, strings
298 * intact. However, I prefer to remove them all so that the next
299 * scanner will not need to reduce the continuation state.
300 *
301 * <*>\\\n newline(0);
302 */
304 /*
305 * Detect the leading # of a preprocessor directive.
306 */
307 <INITIAL,pp_ignore>^{ws}*# pp_incl_state.seen_junk++; yy_push_state(pp_pp);
309 /*
310 * Scan for the preprocessor directives
311 */
312 <pp_pp>{ws}*include{ws}* if(yy_top_state() != pp_ignore) {yy_pp_state(pp_inc); return tINCLUDE;} else {yy_pp_state(pp_eol);}
313 <pp_pp>{ws}*define{ws}* yy_pp_state(yy_current_state() != pp_ignore ? pp_def : pp_eol);
314 <pp_pp>{ws}*error{ws}* yy_pp_state(pp_eol); if(yy_top_state() != pp_ignore) return tERROR;
315 <pp_pp>{ws}*warning{ws}* yy_pp_state(pp_eol); if(yy_top_state() != pp_ignore) return tWARNING;
316 <pp_pp>{ws}*pragma{ws}* yy_pp_state(pp_eol); if(yy_top_state() != pp_ignore) return tPRAGMA;
317 <pp_pp>{ws}*ident{ws}* yy_pp_state(pp_eol); if(yy_top_state() != pp_ignore) return tPPIDENT;
318 <pp_pp>{ws}*undef{ws}* if(yy_top_state() != pp_ignore) {yy_pp_state(pp_ifd); return tUNDEF;} else {yy_pp_state(pp_eol);}
319 <pp_pp>{ws}*ifdef{ws}* yy_pp_state(pp_ifd); return tIFDEF;
320 <pp_pp>{ws}*ifndef{ws}* pp_incl_state.seen_junk--; yy_pp_state(pp_ifd); return tIFNDEF;
321 <pp_pp>{ws}*if{ws}* yy_pp_state(pp_if); return tIF;
322 <pp_pp>{ws}*elif{ws}* yy_pp_state(pp_if); return tELIF;
323 <pp_pp>{ws}*else{ws}* yy_pp_state(pp_endif); return tELSE;
324 <pp_pp>{ws}*endif{ws}* yy_pp_state(pp_endif); return tENDIF;
325 <pp_pp>{ws}*line{ws}* if(yy_top_state() != pp_ignore) {yy_pp_state(pp_line); return tLINE;} else {yy_pp_state(pp_eol);}
326 <pp_pp>{ws}+ if(yy_top_state() != pp_ignore) {yy_pp_state(pp_line); return tGCCLINE;} else {yy_pp_state(pp_eol);}
327 <pp_pp>{ws}*[a-z]+ ppy_error("Invalid preprocessor token '%s'", ppy_text);
328 <pp_pp>\r?\n newline(1); yy_pop_state(); return tNL; /* This could be the null-token */
329 <pp_pp>\\\r?\n newline(0);
330 <pp_pp>\\\r? ppy_error("Preprocessor junk '%s'", ppy_text);
331 <pp_pp>. return *ppy_text;
333 /*
334 * Handle #include and #line
335 */
336 <pp_line>[0-9]+ return make_number(10, &ppy_lval, ppy_text, ppy_leng);
337 <pp_inc>\< new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_iqs);
338 <pp_inc,pp_line>\" new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_dqs);
339 <pp_inc,pp_line>{ws}+ ;
340 <pp_inc,pp_line>\n newline(1); yy_pop_state(); return tNL;
341 <pp_inc,pp_line>\\\r?\n newline(0);
342 <pp_inc,pp_line>(\\\r?)|(.) ppy_error(yy_current_state() == pp_inc ? "Trailing junk in #include" : "Trailing junk in #line");
344 /*
345 * Ignore all input when a false clause is parsed
346 */
347 <pp_ignore>[^#/\\\n]+ ;
348 <pp_ignore>\n newline(1);
349 <pp_ignore>\\\r?\n newline(0);
350 <pp_ignore>(\\\r?)|(.) ;
352 /*
353 * Handle #if and #elif.
354 * These require conditionals to be evaluated, but we do not
355 * want to jam the scanner normally when we see these tokens.
356 * Note: tIDENT is handled below.
357 */
359 <pp_if>0[0-7]*{ul}? return make_number(8, &ppy_lval, ppy_text, ppy_leng);
360 <pp_if>0[0-7]*[8-9]+{ul}? ppy_error("Invalid octal digit");
361 <pp_if>[1-9][0-9]*{ul}? return make_number(10, &ppy_lval, ppy_text, ppy_leng);
362 <pp_if>0[xX][0-9a-fA-F]+{ul}? return make_number(16, &ppy_lval, ppy_text, ppy_leng);
363 <pp_if>0[xX] ppy_error("Invalid hex number");
364 <pp_if>defined yy_push_state(pp_defined); return tDEFINED;
365 <pp_if>"<<" return tLSHIFT;
366 <pp_if>">>" return tRSHIFT;
367 <pp_if>"&&" return tLOGAND;
368 <pp_if>"||" return tLOGOR;
369 <pp_if>"==" return tEQ;
370 <pp_if>"!=" return tNE;
371 <pp_if>"<=" return tLTE;
372 <pp_if>">=" return tGTE;
373 <pp_if>\n newline(1); yy_pop_state(); return tNL;
374 <pp_if>\\\r?\n newline(0);
375 <pp_if>\\\r? ppy_error("Junk in conditional expression");
376 <pp_if>{ws}+ ;
377 <pp_if>\' new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_sqs);
378 <pp_if>\" ppy_error("String constants not allowed in conditionals");
379 <pp_if>. return *ppy_text;
381 /*
382 * Handle #ifdef, #ifndef and #undef
383 * to get only an untranslated/unexpanded identifier
384 */
385 <pp_ifd>{cident} ppy_lval.cptr = pp_xstrdup(ppy_text); return tIDENT;
386 <pp_ifd>{ws}+ ;
387 <pp_ifd>\n newline(1); yy_pop_state(); return tNL;
388 <pp_ifd>\\\r?\n newline(0);
389 <pp_ifd>(\\\r?)|(.) ppy_error("Identifier expected");
391 /*
392 * Handle #else and #endif.
393 */
394 <pp_endif>{ws}+ ;
395 <pp_endif>\n newline(1); yy_pop_state(); return tNL;
396 <pp_endif>\\\r?\n newline(0);
397 <pp_endif>. ppy_error("Garbage after #else or #endif.");
399 /*
400 * Handle the special 'defined' keyword.
401 * This is necessary to get the identifier prior to any
402 * substitutions.
403 */
404 <pp_defined>{cident} yy_pop_state(); ppy_lval.cptr = pp_xstrdup(ppy_text); return tIDENT;
405 <pp_defined>{ws}+ ;
406 <pp_defined>(\()|(\)) return *ppy_text;
407 <pp_defined>\\\r?\n newline(0);
408 <pp_defined>(\\.)|(\n)|(.) ppy_error("Identifier expected");
410 /*
411 * Handle #error, #warning, #pragma and #ident.
412 * Pass everything literally to the parser, which
413 * will act appropriately.
414 * Comments are stripped from the literal text.
415 */
416 <pp_eol>[^/\\\n]+ if(yy_top_state() != pp_ignore) { ppy_lval.cptr = pp_xstrdup(ppy_text); return tLITERAL; }
417 <pp_eol>\/[^/\\\n*]* if(yy_top_state() != pp_ignore) { ppy_lval.cptr = pp_xstrdup(ppy_text); return tLITERAL; }
418 <pp_eol>(\\\r?)|(\/[^/*]) if(yy_top_state() != pp_ignore) { ppy_lval.cptr = pp_xstrdup(ppy_text); return tLITERAL; }
419 <pp_eol>\n newline(1); yy_pop_state(); if(yy_current_state() != pp_ignore) { return tNL; }
420 <pp_eol>\\\r?\n newline(0);
422 /*
423 * Handle left side of #define
424 */
425 <pp_def>{cident}\( ppy_lval.cptr = pp_xstrdup(ppy_text); ppy_lval.cptr[ppy_leng-1] = '\0'; yy_pp_state(pp_macro); return tMACRO;
426 <pp_def>{cident} ppy_lval.cptr = pp_xstrdup(ppy_text); yy_pp_state(pp_define); return tDEFINE;
427 <pp_def>{ws}+ ;
428 <pp_def>\\\r?\n newline(0);
429 <pp_def>(\\\r?)|(\n)|(.) perror("Identifier expected");
431 /*
432 * Scan the substitution of a define
433 */
434 <pp_define>[^'"/\\\n]+ ppy_lval.cptr = pp_xstrdup(ppy_text); return tLITERAL;
435 <pp_define>(\\\r?)|(\/[^/*]) ppy_lval.cptr = pp_xstrdup(ppy_text); return tLITERAL;
436 <pp_define>\\\r?\n{ws}+ newline(0); ppy_lval.cptr = pp_xstrdup(" "); return tLITERAL;
437 <pp_define>\\\r?\n newline(0);
438 <pp_define>\n newline(1); yy_pop_state(); return tNL;
439 <pp_define>\' new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_sqs);
440 <pp_define>\" new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_dqs);
442 /*
443 * Scan the definition macro arguments
444 */
445 <pp_macro>\){ws}* yy_pp_state(pp_mbody); return tMACROEND;
446 <pp_macro>{ws}+ ;
447 <pp_macro>{cident} ppy_lval.cptr = pp_xstrdup(ppy_text); return tIDENT;
448 <pp_macro>, return ',';
449 <pp_macro>"..." return tELIPSIS;
450 <pp_macro>(\\\r?)|(\n)|(.)|(\.\.?) ppy_error("Argument identifier expected");
451 <pp_macro>\\\r?\n newline(0);
453 /*
454 * Scan the substitution of a macro
455 */
456 <pp_mbody>[^a-zA-Z0-9'"#/\\\n]+ ppy_lval.cptr = pp_xstrdup(ppy_text); return tLITERAL;
457 <pp_mbody>{cident} ppy_lval.cptr = pp_xstrdup(ppy_text); return tIDENT;
458 <pp_mbody>\#\# return tCONCAT;
459 <pp_mbody>\# return tSTRINGIZE;
460 <pp_mbody>[0-9][^'"#/\\\n]* ppy_lval.cptr = pp_xstrdup(ppy_text); return tLITERAL;
461 <pp_mbody>(\\\r?)|(\/[^/*'"#\\\n]*) ppy_lval.cptr = pp_xstrdup(ppy_text); return tLITERAL;
462 <pp_mbody>\\\r?\n{ws}+ newline(0); ppy_lval.cptr = pp_xstrdup(" "); return tLITERAL;
463 <pp_mbody>\\\r?\n newline(0);
464 <pp_mbody>\n newline(1); yy_pop_state(); return tNL;
465 <pp_mbody>\' new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_sqs);
466 <pp_mbody>\" new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_dqs);
468 /*
469 * Macro expansion text scanning.
470 * This state is active just after the identifier is scanned
471 * that triggers an expansion. We *must* delete the leading
472 * whitespace before we can start scanning for arguments.
473 *
474 * If we do not see a '(' as next trailing token, then we have
475 * a false alarm. We just continue with a nose-bleed...
476 */
477 <pp_macign>{ws}*/\( yy_pp_state(pp_macscan);
478 <pp_macign>{ws}*\n {
479 if(yy_top_state() != pp_macscan)
480 newline(0);
481 }
482 <pp_macign>{ws}*\\\r?\n newline(0);
483 <pp_macign>{ws}+|{ws}*\\\r?|. {
484 macexpstackentry_t *mac = pop_macro();
485 yy_pop_state();
486 put_buffer(mac->ppp->ident, strlen(mac->ppp->ident));
487 put_buffer(ppy_text, ppy_leng);
488 free_macro(mac);
489 }
491 /*
492 * Macro expansion argument text scanning.
493 * This state is active when a macro's arguments are being read for expansion.
494 */
495 <pp_macscan>\( {
496 if(++MACROPARENTHESES() > 1)
497 add_text_to_macro(ppy_text, ppy_leng);
498 }
499 <pp_macscan>\) {
500 if(--MACROPARENTHESES() == 0)
501 {
502 yy_pop_state();
503 macro_add_arg(1);
504 }
505 else
506 add_text_to_macro(ppy_text, ppy_leng);
507 }
508 <pp_macscan>, {
509 if(MACROPARENTHESES() > 1)
510 add_text_to_macro(ppy_text, ppy_leng);
511 else
512 macro_add_arg(0);
513 }
514 <pp_macscan>\" new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_dqs);
515 <pp_macscan>\' new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_sqs);
516 <pp_macscan>"/*" yy_push_state(pp_comment); add_text_to_macro(" ", 1);
517 <pp_macscan>\n pp_status.line_number++; pp_status.char_number = 1; add_text_to_macro(ppy_text, ppy_leng);
518 <pp_macscan>([^/(),\\\n"']+)|(\/[^/*(),\\\n'"]*)|(\\\r?)|(.) add_text_to_macro(ppy_text, ppy_leng);
519 <pp_macscan>\\\r?\n newline(0);
521 /*
522 * Comment handling (almost all start-conditions)
523 */
524 <INITIAL,pp_pp,pp_ignore,pp_eol,pp_inc,pp_if,pp_ifd,pp_endif,pp_defined,pp_def,pp_define,pp_macro,pp_mbody,RCINCL>"/*" yy_push_state(pp_comment);
525 <pp_comment>[^*\n]*|"*"+[^*/\n]* ;
526 <pp_comment>\n newline(0);
527 <pp_comment>"*"+"/" yy_pop_state();
529 /*
530 * Remove C++ style comment (almost all start-conditions)
531 */
532 <INITIAL,pp_pp,pp_ignore,pp_eol,pp_inc,pp_if,pp_ifd,pp_endif,pp_defined,pp_def,pp_define,pp_macro,pp_mbody,pp_macscan,RCINCL>"//"[^\n]* {
533 if(ppy_text[ppy_leng-1] == '\\')
534 ppy_warning("C++ style comment ends with an escaped newline (escape ignored)");
535 }
537 /*
538 * Single, double and <> quoted constants
539 */
540 <INITIAL,pp_macexp>\" pp_incl_state.seen_junk++; new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_dqs);
541 <INITIAL,pp_macexp>\' pp_incl_state.seen_junk++; new_string(); add_string(ppy_text, ppy_leng); yy_push_state(pp_sqs);
542 <pp_dqs>[^"\\\n]+ add_string(ppy_text, ppy_leng);
543 <pp_dqs>\" {
544 add_string(ppy_text, ppy_leng);
545 yy_pop_state();
546 switch(yy_current_state())
547 {
548 case pp_pp:
549 case pp_define:
550 case pp_mbody:
551 case pp_inc:
552 case RCINCL:
553 if (yy_current_state()==RCINCL) yy_pop_state();
554 ppy_lval.cptr = get_string();
555 return tDQSTRING;
556 case pp_line:
557 ppy_lval.cptr = get_string();
558 return tDQSTRING;
559 default:
560 put_string();
561 }
562 }
563 <pp_sqs>[^'\\\n]+ add_string(ppy_text, ppy_leng);
564 <pp_sqs>\' {
565 add_string(ppy_text, ppy_leng);
566 yy_pop_state();
567 switch(yy_current_state())
568 {
569 case pp_if:
570 case pp_define:
571 case pp_mbody:
572 ppy_lval.cptr = get_string();
573 return tSQSTRING;
574 default:
575 put_string();
576 }
577 }
578 <pp_iqs>[^\>\\\n]+ add_string(ppy_text, ppy_leng);
579 <pp_iqs>\> {
580 add_string(ppy_text, ppy_leng);
581 yy_pop_state();
582 ppy_lval.cptr = get_string();
583 return tIQSTRING;
584 }
585 <pp_dqs>\\\r?\n {
586 /*
587 * This is tricky; we need to remove the line-continuation
588 * from preprocessor strings, but OTOH retain them in all
589 * other strings. This is because the resource grammar is
590 * even more braindead than initially analysed and line-
591 * continuations in strings introduce, sigh, newlines in
592 * the output. There goes the concept of non-breaking, non-
593 * spacing whitespace.
594 */
595 switch(yy_top_state())
596 {
597 case pp_pp:
598 case pp_define:
599 case pp_mbody:
600 case pp_inc:
601 case pp_line:
602 newline(0);
603 break;
604 default:
605 add_string(ppy_text, ppy_leng);
606 newline(-1);
607 }
608 }
609 <pp_iqs,pp_dqs,pp_sqs>\\. add_string(ppy_text, ppy_leng);
610 <pp_iqs,pp_dqs,pp_sqs>\n {
611 newline(1);
612 add_string(ppy_text, ppy_leng);
613 ppy_warning("Newline in string constant encounterd (started line %d)", string_start());
614 }
616 /*
617 * Identifier scanning
618 */
619 <INITIAL,pp_if,pp_inc,pp_macexp>{cident} {
620 pp_entry_t *ppp;
621 pp_incl_state.seen_junk++;
622 if(!(ppp = pplookup(ppy_text)))
623 {
624 if(yy_current_state() == pp_inc)
625 ppy_error("Expected include filename");
627 if(yy_current_state() == pp_if)
628 {
629 ppy_lval.cptr = pp_xstrdup(ppy_text);
630 return tIDENT;
631 }
632 else {
633 if((yy_current_state()==INITIAL) && (strcasecmp(ppy_text,"RCINCLUDE")==0)){
634 yy_push_state(RCINCL);
635 return tRCINCLUDE;
636 }
637 else put_buffer(ppy_text, ppy_leng);
638 }
639 }
640 else if(!ppp->expanding)
641 {
642 switch(ppp->type)
643 {
644 case def_special:
645 expand_special(ppp);
646 break;
647 case def_define:
648 expand_define(ppp);
649 break;
650 case def_macro:
651 yy_push_state(pp_macign);
652 push_macro(ppp);
653 break;
654 default:
655 pp_internal_error(__FILE__, __LINE__, "Invalid define type %d\n", ppp->type);
656 }
657 }
658 else put_buffer(ppy_text, ppy_leng);
659 }
661 /*
662 * Everything else that needs to be passed and
663 * newline and continuation handling
664 */
665 <INITIAL,pp_macexp>[^a-zA-Z_#'"/\\\n \r\t\f\v]+|(\/|\\)[^a-zA-Z_/*'"\\\n \r\t\v\f]* pp_incl_state.seen_junk++; put_buffer(ppy_text, ppy_leng);
666 <INITIAL,pp_macexp>{ws}+ put_buffer(ppy_text, ppy_leng);
667 <INITIAL>\n newline(1);
668 <INITIAL>\\\r?\n newline(0);
669 <INITIAL>\\\r? pp_incl_state.seen_junk++; put_buffer(ppy_text, ppy_leng);
671 /*
672 * Special catcher for macro argmument expansion to prevent
673 * newlines to propagate to the output or admin.
674 */
675 <pp_macexp>(\n)|(.)|(\\\r?(\n|.)) put_buffer(ppy_text, ppy_leng);
677 <RCINCL>[A-Za-z0-9_\.\\/]+ {
678 ppy_lval.cptr=pp_xstrdup(ppy_text);
679 yy_pop_state();
680 return tRCINCLUDEPATH;
681 }
683 <RCINCL>{ws}+ ;
685 <RCINCL>\" {
686 new_string(); add_string(ppy_text,ppy_leng);yy_push_state(pp_dqs);
687 }
689 /*
690 * This is a 'catch-all' rule to discover errors in the scanner
691 * in an orderly manner.
692 */
693 <*>. pp_incl_state.seen_junk++; ppy_warning("Unmatched text '%c' (0x%02x); please report\n", isprint(*ppy_text & 0xff) ? *ppy_text : ' ', *ppy_text);
695 <<EOF>> {
696 YY_BUFFER_STATE b = YY_CURRENT_BUFFER;
697 bufferstackentry_t *bep = pop_buffer();
699 if((!bep && pp_get_if_depth()) || (bep && pp_get_if_depth() != bep->if_depth))
700 ppy_warning("Unmatched #if/#endif at end of file");
702 if(!bep)
703 {
704 if(YY_START != INITIAL)
705 ppy_error("Unexpected end of file during preprocessing");
706 yyterminate();
707 }
708 else if(bep->should_pop == 2)
709 {
710 macexpstackentry_t *mac;
711 mac = pop_macro();
712 expand_macro(mac);
713 }
714 ppy__delete_buffer(b);
715 }
717 %%
718 /*
719 **************************************************************************
720 * Support functions
721 **************************************************************************
722 */
724 #ifndef ppy_wrap
725 int ppy_wrap(void)
726 {
727 return 1;
728 }
729 #endif
732 /*
733 *-------------------------------------------------------------------------
734 * Output newlines or set them as continuations
735 *
736 * Input: -1 - Don't count this one, but update local position (see pp_dqs)
737 * 0 - Line-continuation seen and cache output
738 * 1 - Newline seen and flush output
739 *-------------------------------------------------------------------------
740 */
741 static void newline(int dowrite)
742 {
743 pp_status.line_number++;
744 pp_status.char_number = 1;
746 if(dowrite == -1)
747 return;
749 ncontinuations++;
750 if(dowrite)
751 {
752 for(;ncontinuations; ncontinuations--)
753 put_buffer("\n", 1);
754 }
755 }
758 /*
759 *-------------------------------------------------------------------------
760 * Make a number out of an any-base and suffixed string
761 *
762 * Possible number extensions:
763 * - "" int
764 * - "L" long int
765 * - "LL" long long int
766 * - "U" unsigned int
767 * - "UL" unsigned long int
768 * - "ULL" unsigned long long int
769 * - "LU" unsigned long int
770 * - "LLU" unsigned long long int
771 * - "LUL" invalid
772 *
773 * FIXME:
774 * The sizes of resulting 'int' and 'long' are compiler specific.
775 * I depend on sizeof(int) > 2 here (although a relatively safe
776 * assumption).
777 * Long longs are not yet implemented because this is very compiler
778 * specific and I don't want to think too much about the problems.
779 *
780 *-------------------------------------------------------------------------
781 */
782 static int make_number(int radix, YYSTYPE *val, const char *str, int len)
783 {
784 int is_l = 0;
785 int is_ll = 0;
786 int is_u = 0;
787 char ext[4];
789 ext[3] = '\0';
790 ext[2] = toupper(str[len-1]);
791 ext[1] = len > 1 ? toupper(str[len-2]) : ' ';
792 ext[0] = len > 2 ? toupper(str[len-3]) : ' ';
794 if(!strcmp(ext, "LUL"))
795 ppy_error("Invalid constant suffix");
796 else if(!strcmp(ext, "LLU") || !strcmp(ext, "ULL"))
797 {
798 is_ll++;
799 is_u++;
800 }
801 else if(!strcmp(ext+1, "LU") || !strcmp(ext+1, "UL"))
802 {
803 is_l++;
804 is_u++;
805 }
806 else if(!strcmp(ext+1, "LL"))
807 {
808 is_ll++;
809 }
810 else if(!strcmp(ext+2, "L"))
811 {
812 is_l++;
813 }
814 else if(!strcmp(ext+2, "U"))
815 {
816 is_u++;
817 }
819 if(is_ll)
820 {
821 /* Assume as in the declaration of wrc_ull_t and wrc_sll_t */
822 #ifdef HAVE_LONG_LONG
823 if (is_u)
824 {
825 val->ull = strtoull(str, NULL, radix);
826 return tULONGLONG;
827 }
828 else
829 {
830 val->sll = strtoll(str, NULL, radix);
831 return tSLONGLONG;
832 }
833 #else
834 pp_internal_error(__FILE__, __LINE__, "long long constants not supported on this platform");
835 #endif
836 }
837 else if(is_u && is_l)
838 {
839 val->ulong = strtoul(str, NULL, radix);
840 return tULONG;
841 }
842 else if(!is_u && is_l)
843 {
844 val->slong = strtol(str, NULL, radix);
845 return tSLONG;
846 }
847 else if(is_u && !is_l)
848 {
849 val->uint = (unsigned int)strtoul(str, NULL, radix);
850 return tUINT;
851 }
853 /* Else it must be an int... */
854 val->sint = (int)strtol(str, NULL, radix);
855 return tSINT;
856 }
859 /*
860 *-------------------------------------------------------------------------
861 * Macro and define expansion support
862 *
863 * FIXME: Variable macro arguments.
864 *-------------------------------------------------------------------------
865 */
866 static void expand_special(pp_entry_t *ppp)
867 {
868 const char *dbgtext = "?";
869 static char *buf = NULL;
871 assert(ppp->type == def_special);
873 if(!strcmp(ppp->ident, "__LINE__"))
874 {
875 dbgtext = "def_special(__LINE__)";
876 buf = pp_xrealloc(buf, 32);
877 sprintf(buf, "%d", pp_status.line_number);
878 }
879 else if(!strcmp(ppp->ident, "__FILE__"))
880 {
881 dbgtext = "def_special(__FILE__)";
882 buf = pp_xrealloc(buf, strlen(pp_status.input) + 3);
883 sprintf(buf, "\"%s\"", pp_status.input);
884 }
885 else
886 pp_internal_error(__FILE__, __LINE__, "Special macro '%s' not found...\n", ppp->ident);
888 if(pp_flex_debug)
889 fprintf(stderr, "expand_special(%d): %s:%d: '%s' -> '%s'\n",
890 macexpstackidx,
891 pp_status.input,
892 pp_status.line_number,
893 ppp->ident,
894 buf ? buf : "");
896 if(buf && buf[0])
897 {
898 push_buffer(ppp, NULL, NULL, 0);
899 yy_scan_string(buf);
900 }
901 }
903 static void expand_define(pp_entry_t *ppp)
904 {
905 assert(ppp->type == def_define);
907 if(pp_flex_debug)
908 fprintf(stderr, "expand_define(%d): %s:%d: '%s' -> '%s'\n",
909 macexpstackidx,
910 pp_status.input,
911 pp_status.line_number,
912 ppp->ident,
913 ppp->subst.text);
914 if(ppp->subst.text && ppp->subst.text[0])
915 {
916 push_buffer(ppp, NULL, NULL, 0);
917 yy_scan_string(ppp->subst.text);
918 }
919 }
921 static int curdef_idx = 0;
922 static int curdef_alloc = 0;
923 static char *curdef_text = NULL;
925 static void add_text(const char *str, int len)
926 {
927 if(len == 0)
928 return;
929 if(curdef_idx >= curdef_alloc || curdef_alloc - curdef_idx < len)
930 {
931 curdef_alloc += (len + ALLOCBLOCKSIZE-1) & ~(ALLOCBLOCKSIZE-1);
932 curdef_text = pp_xrealloc(curdef_text, curdef_alloc * sizeof(curdef_text[0]));
933 if(curdef_alloc > 65536)
934 ppy_warning("Reallocating macro-expansion buffer larger than 64kB");
935 }
936 memcpy(&curdef_text[curdef_idx], str, len);
937 curdef_idx += len;
938 }
940 static mtext_t *add_expand_text(mtext_t *mtp, macexpstackentry_t *mep, int *nnl)
941 {
942 char *cptr;
943 char *exp;
944 int tag;
945 int n;
947 if(mtp == NULL)
948 return NULL;
950 switch(mtp->type)
951 {
952 case exp_text:
953 if(pp_flex_debug)
954 fprintf(stderr, "add_expand_text: exp_text: '%s'\n", mtp->subst.text);
955 add_text(mtp->subst.text, strlen(mtp->subst.text));
956 break;
958 case exp_stringize:
959 if(pp_flex_debug)
960 fprintf(stderr, "add_expand_text: exp_stringize(%d): '%s'\n",
961 mtp->subst.argidx,
962 mep->args[mtp->subst.argidx]);
963 cptr = mep->args[mtp->subst.argidx];
964 add_text("\"", 1);
965 while(*cptr)
966 {
967 if(*cptr == '"' || *cptr == '\\')
968 add_text("\\", 1);
969 add_text(cptr, 1);
970 cptr++;
971 }
972 add_text("\"", 1);
973 break;
975 case exp_concat:
976 if(pp_flex_debug)
977 fprintf(stderr, "add_expand_text: exp_concat\n");
978 /* Remove trailing whitespace from current expansion text */
979 while(curdef_idx)
980 {
981 if(isspace(curdef_text[curdef_idx-1] & 0xff))
982 curdef_idx--;
983 else
984 break;
985 }
986 /* tag current position and recursively expand the next part */
987 tag = curdef_idx;
988 mtp = add_expand_text(mtp->next, mep, nnl);
990 /* Now get rid of the leading space of the expansion */
991 cptr = &curdef_text[tag];
992 n = curdef_idx - tag;
993 while(n)
994 {
995 if(isspace(*cptr & 0xff))
996 {
997 cptr++;
998 n--;
999 }
1000 else
1001 break;
1002 }
1003 if(cptr != &curdef_text[tag])
1004 {
1005 memmove(&curdef_text[tag], cptr, n);
1006 curdef_idx -= (curdef_idx - tag) - n;
1007 }
1008 break;
1010 case exp_subst:
1011 if((mtp->next && mtp->next->type == exp_concat) || (mtp->prev && mtp->prev->type == exp_concat))
1012 exp = mep->args[mtp->subst.argidx];
1013 else
1014 exp = mep->ppargs[mtp->subst.argidx];
1015 if(exp)
1016 {
1017 add_text(exp, strlen(exp));
1018 *nnl -= mep->nnls[mtp->subst.argidx];
1019 cptr = strchr(exp, '\n');
1020 while(cptr)
1021 {
1022 *cptr = ' ';
1023 cptr = strchr(cptr+1, '\n');
1024 }
1025 mep->nnls[mtp->subst.argidx] = 0;
1026 }
1027 if(pp_flex_debug)
1028 fprintf(stderr, "add_expand_text: exp_subst(%d): '%s'\n", mtp->subst.argidx, exp);
1029 break;
1031 default:
1032 pp_internal_error(__FILE__, __LINE__, "Invalid expansion type (%d) in macro expansion\n", mtp->type);
1033 }
1034 return mtp;
1035 }
1037 static void expand_macro(macexpstackentry_t *mep)
1038 {
1039 mtext_t *mtp;
1040 int n, k;
1041 char *cptr;
1042 int nnl = 0;
1043 pp_entry_t *ppp = mep->ppp;
1044 int nargs = mep->nargs;
1046 assert(ppp->type == def_macro);
1047 assert(ppp->expanding == 0);
1049 if((ppp->nargs >= 0 && nargs != ppp->nargs) || (ppp->nargs < 0 && nargs < -ppp->nargs))
1050 ppy_error("Too %s macro arguments (%d)", nargs < abs(ppp->nargs) ? "few" : "many", nargs);
1052 for(n = 0; n < nargs; n++)
1053 nnl += mep->nnls[n];
1055 if(pp_flex_debug)
1056 fprintf(stderr, "expand_macro(%d): %s:%d: '%s'(%d,%d) -> ...\n",
1057 macexpstackidx,
1058 pp_status.input,
1059 pp_status.line_number,
1060 ppp->ident,
1061 mep->nargs,
1062 nnl);
1064 curdef_idx = 0;
1066 for(mtp = ppp->subst.mtext; mtp; mtp = mtp->next)
1067 {
1068 if(!(mtp = add_expand_text(mtp, mep, &nnl)))
1069 break;
1070 }
1072 for(n = 0; n < nnl; n++)
1073 add_text("\n", 1);
1075 /* To make sure there is room and termination (see below) */
1076 add_text(" \0", 2);
1078 /* Strip trailing whitespace from expansion */
1079 for(k = curdef_idx, cptr = &curdef_text[curdef_idx-1]; k > 0; k--, cptr--)
1080 {
1081 if(!isspace(*cptr & 0xff))
1082 break;
1083 }
1085 /*
1086 * We must add *one* whitespace to make sure that there
1087 * is a token-separation after the expansion.
1088 */
1089 *(++cptr) = ' ';
1090 *(++cptr) = '\0';
1091 k++;
1093 /* Strip leading whitespace from expansion */
1094 for(n = 0, cptr = curdef_text; n < k; n++, cptr++)
1095 {
1096 if(!isspace(*cptr & 0xff))
1097 break;
1098 }
1100 if(k - n > 0)
1101 {
1102 if(pp_flex_debug)
1103 fprintf(stderr, "expand_text: '%s'\n", curdef_text + n);
1104 push_buffer(ppp, NULL, NULL, 0);
1105 /*yy_scan_bytes(curdef_text + n, k - n);*/
1106 yy_scan_string(curdef_text + n);
1107 }
1108 }
1110 /*
1111 *-------------------------------------------------------------------------
1112 * String collection routines
1113 *-------------------------------------------------------------------------
1114 */
1115 static void new_string(void)
1116 {
1117 #ifdef DEBUG
1118 if(strbuf_idx)
1119 ppy_warning("new_string: strbuf_idx != 0");
1120 #endif
1121 strbuf_idx = 0;
1122 str_startline = pp_status.line_number;
1123 }
1125 static void add_string(const char *str, int len)
1126 {
1127 if(len == 0)
1128 return;
1129 if(strbuf_idx >= strbuf_alloc || strbuf_alloc - strbuf_idx < len)
1130 {
1131 strbuf_alloc += (len + ALLOCBLOCKSIZE-1) & ~(ALLOCBLOCKSIZE-1);
1132 strbuffer = pp_xrealloc(strbuffer, strbuf_alloc * sizeof(strbuffer[0]));
1133 if(strbuf_alloc > 65536)
1134 ppy_warning("Reallocating string buffer larger than 64kB");
1135 }
1136 memcpy(&strbuffer[strbuf_idx], str, len);
1137 strbuf_idx += len;
1138 }
1140 static char *get_string(void)
1141 {
1142 char *str = pp_xmalloc(strbuf_idx + 1);
1143 memcpy(str, strbuffer, strbuf_idx);
1144 str[strbuf_idx] = '\0';
1145 #ifdef DEBUG
1146 strbuf_idx = 0;
1147 #endif
1148 return str;
1149 }
1151 static void put_string(void)
1152 {
1153 put_buffer(strbuffer, strbuf_idx);
1154 #ifdef DEBUG
1155 strbuf_idx = 0;
1156 #endif
1157 }
1159 static int string_start(void)
1160 {
1161 return str_startline;
1162 }
1165 /*
1166 *-------------------------------------------------------------------------
1167 * Buffer management
1168 *-------------------------------------------------------------------------
1169 */
1170 static void push_buffer(pp_entry_t *ppp, char *filename, char *incname, int pop)
1171 {
1172 if(ppy_debug)
1173 printf("push_buffer(%d): %p %p %p %d\n", bufferstackidx, ppp, filename, incname, pop);
1174 if(bufferstackidx >= MAXBUFFERSTACK)
1175 pp_internal_error(__FILE__, __LINE__, "Buffer stack overflow");
1177 memset(&bufferstack[bufferstackidx], 0, sizeof(bufferstack[0]));
1178 bufferstack[bufferstackidx].bufferstate = YY_CURRENT_BUFFER;
1179 bufferstack[bufferstackidx].define = ppp;
1180 bufferstack[bufferstackidx].line_number = pp_status.line_number;
1181 bufferstack[bufferstackidx].char_number = pp_status.char_number;
1182 bufferstack[bufferstackidx].if_depth = pp_get_if_depth();
1183 bufferstack[bufferstackidx].should_pop = pop;
1184 bufferstack[bufferstackidx].filename = pp_status.input;
1185 bufferstack[bufferstackidx].ncontinuations = ncontinuations;
1186 bufferstack[bufferstackidx].incl = pp_incl_state;
1187 bufferstack[bufferstackidx].include_filename = incname;
1189 if(ppp)
1190 ppp->expanding = 1;
1191 else if(filename)
1192 {
1193 /* These will track the ppy_error to the correct file and line */
1194 pp_status.line_number = 1;
1195 pp_status.char_number = 1;
1196 pp_status.input = filename;
1197 ncontinuations = 0;
1198 }
1199 else if(!pop)
1200 pp_internal_error(__FILE__, __LINE__, "Pushing buffer without knowing where to go to");
1201 bufferstackidx++;
1202 }
1204 static bufferstackentry_t *pop_buffer(void)
1205 {
1206 if(bufferstackidx < 0)
1207 pp_internal_error(__FILE__, __LINE__, "Bufferstack underflow?");
1209 if(bufferstackidx == 0)
1210 return NULL;
1212 bufferstackidx--;
1214 if(bufferstack[bufferstackidx].define)
1215 bufferstack[bufferstackidx].define->expanding = 0;
1216 else
1217 {
1218 pp_status.line_number = bufferstack[bufferstackidx].line_number;
1219 pp_status.char_number = bufferstack[bufferstackidx].char_number;
1220 pp_status.input = bufferstack[bufferstackidx].filename;
1221 ncontinuations = bufferstack[bufferstackidx].ncontinuations;
1222 if(!bufferstack[bufferstackidx].should_pop)
1223 {
1224 fclose(ppy_in);
1225 fprintf(ppy_out, "# %d \"%s\" 2\n", pp_status.line_number, pp_status.input);
1227 /* We have EOF, check the include logic */
1228 if(pp_incl_state.state == 2 && !pp_incl_state.seen_junk && pp_incl_state.ppp)
1229 {
1230 pp_entry_t *ppp = pplookup(pp_incl_state.ppp);
1231 if(ppp)
1232 {
1233 includelogicentry_t *iep = pp_xmalloc(sizeof(includelogicentry_t));
1234 iep->ppp = ppp;
1235 ppp->iep = iep;
1236 iep->filename = bufferstack[bufferstackidx].include_filename;
1237 iep->prev = NULL;
1238 iep->next = pp_includelogiclist;
1239 if(iep->next)
1240 iep->next->prev = iep;
1241 pp_includelogiclist = iep;
1242 if(pp_status.debug)
1243 fprintf(stderr, "pop_buffer: %s:%d: includelogic added, include_ppp='%s', file='%s'\n", pp_status.input, pp_status.line_number, pp_incl_state.ppp, iep->filename);
1244 }
1245 else
1246 free(bufferstack[bufferstackidx].include_filename);
1247 }
1248 free(pp_incl_state.ppp);
1249 pp_incl_state = bufferstack[bufferstackidx].incl;
1251 }
1252 }
1254 if(ppy_debug)
1255 printf("pop_buffer(%d): %p %p (%d, %d, %d) %p %d\n",
1256 bufferstackidx,
1257 bufferstack[bufferstackidx].bufferstate,
1258 bufferstack[bufferstackidx].define,
1259 bufferstack[bufferstackidx].line_number,
1260 bufferstack[bufferstackidx].char_number,
1261 bufferstack[bufferstackidx].if_depth,
1262 bufferstack[bufferstackidx].filename,
1263 bufferstack[bufferstackidx].should_pop);
1265 ppy__switch_to_buffer(bufferstack[bufferstackidx].bufferstate);
1267 if(bufferstack[bufferstackidx].should_pop)
1268 {
1269 if(yy_current_state() == pp_macexp)
1270 macro_add_expansion();
1271 else
1272 pp_internal_error(__FILE__, __LINE__, "Pop buffer and state without macro expansion state");
1273 yy_pop_state();
1274 }
1276 return &bufferstack[bufferstackidx];
1277 }
1280 /*
1281 *-------------------------------------------------------------------------
1282 * Macro nestng support
1283 *-------------------------------------------------------------------------
1284 */
1285 static void push_macro(pp_entry_t *ppp)
1286 {
1287 if(macexpstackidx >= MAXMACEXPSTACK)
1288 ppy_error("Too many nested macros");
1290 macexpstack[macexpstackidx] = pp_xmalloc(sizeof(macexpstack[0][0]));
1291 memset( macexpstack[macexpstackidx], 0, sizeof(macexpstack[0][0]));
1292 macexpstack[macexpstackidx]->ppp = ppp;
1293 macexpstackidx++;
1294 }
1296 static macexpstackentry_t *top_macro(void)
1297 {
1298 return macexpstackidx > 0 ? macexpstack[macexpstackidx-1] : NULL;
1299 }
1301 static macexpstackentry_t *pop_macro(void)
1302 {
1303 if(macexpstackidx <= 0)
1304 pp_internal_error(__FILE__, __LINE__, "Macro expansion stack underflow\n");
1305 return macexpstack[--macexpstackidx];
1306 }
1308 static void free_macro(macexpstackentry_t *mep)
1309 {
1310 int i;
1312 for(i = 0; i < mep->nargs; i++)
1313 free(mep->args[i]);
1314 free(mep->args);
1315 free(mep->nnls);
1316 free(mep->curarg);
1317 free(mep);
1318 }
1320 static void add_text_to_macro(const char *text, int len)
1321 {
1322 macexpstackentry_t *mep = top_macro();
1324 assert(mep->ppp->expanding == 0);
1326 if(mep->curargalloc - mep->curargsize <= len+1) /* +1 for '\0' */
1327 {
1328 mep->curargalloc += (ALLOCBLOCKSIZE > len+1) ? ALLOCBLOCKSIZE : len+1;
1329 mep->curarg = pp_xrealloc(mep->curarg, mep->curargalloc * sizeof(mep->curarg[0]));
1330 }
1331 memcpy(mep->curarg + mep->curargsize, text, len);
1332 mep->curargsize += len;
1333 mep->curarg[mep->curargsize] = '\0';
1334 }
1336 static void macro_add_arg(int last)
1337 {
1338 int nnl = 0;
1339 char *cptr;
1340 macexpstackentry_t *mep = top_macro();
1342 assert(mep->ppp->expanding == 0);
1344 mep->args = pp_xrealloc(mep->args, (mep->nargs+1) * sizeof(mep->args[0]));
1345 mep->ppargs = pp_xrealloc(mep->ppargs, (mep->nargs+1) * sizeof(mep->ppargs[0]));
1346 mep->nnls = pp_xrealloc(mep->nnls, (mep->nargs+1) * sizeof(mep->nnls[0]));
1347 mep->args[mep->nargs] = pp_xstrdup(mep->curarg ? mep->curarg : "");
1348 cptr = mep->args[mep->nargs]-1;
1349 while((cptr = strchr(cptr+1, '\n')))
1350 {
1351 nnl++;
1352 }
1353 mep->nnls[mep->nargs] = nnl;
1354 mep->nargs++;
1355 free(mep->curarg);
1356 mep->curargalloc = mep->curargsize = 0;
1357 mep->curarg = NULL;
1359 if(pp_flex_debug)
1360 fprintf(stderr, "macro_add_arg: %s:%d: %d -> '%s'\n",
1361 pp_status.input,
1362 pp_status.line_number,
1363 mep->nargs-1,
1364 mep->args[mep->nargs-1]);
1366 /* Each macro argument must be expanded to cope with stingize */
1367 if(last || mep->args[mep->nargs-1][0])
1368 {
1369 yy_push_state(pp_macexp);
1370 push_buffer(NULL, NULL, NULL, last ? 2 : 1);
1371 yy_scan_string(mep->args[mep->nargs-1]);
1372 /*mep->bufferstackidx = bufferstackidx; But not nested! */
1373 }
1374 }
1376 static void macro_add_expansion(void)
1377 {
1378 macexpstackentry_t *mep = top_macro();
1380 assert(mep->ppp->expanding == 0);
1382 mep->ppargs[mep->nargs-1] = pp_xstrdup(mep->curarg ? mep->curarg : "");
1383 free(mep->curarg);
1384 mep->curargalloc = mep->curargsize = 0;
1385 mep->curarg = NULL;
1387 if(pp_flex_debug)
1388 fprintf(stderr, "macro_add_expansion: %s:%d: %d -> '%s'\n",
1389 pp_status.input,
1390 pp_status.line_number,
1391 mep->nargs-1,
1392 mep->ppargs[mep->nargs-1]);
1393 }
1396 /*
1397 *-------------------------------------------------------------------------
1398 * Output management
1399 *-------------------------------------------------------------------------
1400 */
1401 static void put_buffer(const char *s, int len)
1402 {
1403 if(top_macro())
1404 add_text_to_macro(s, len);
1405 else
1406 fwrite(s, 1, len, ppy_out);
1407 }
1410 /*
1411 *-------------------------------------------------------------------------
1412 * Include management
1413 *-------------------------------------------------------------------------
1414 */
1415 void pp_do_include(char *fname, int type)
1416 {
1417 char *newpath;
1418 int n;
1419 includelogicentry_t *iep;
1421 for(iep = pp_includelogiclist; iep; iep = iep->next)
1422 {
1423 if(!strcmp(iep->filename, fname))
1424 {
1425 /*
1426 * We are done. The file was included before.
1427 * If the define was deleted, then this entry would have
1428 * been deleted too.
1429 */
1430 return;
1431 }
1432 }
1434 n = strlen(fname);
1436 if(n <= 2)
1437 ppy_error("Empty include filename");
1439 /* Undo the effect of the quotation */
1440 fname[n-1] = '\0';
1442 if((ppy_in = pp_open_include(fname+1, type ? pp_status.input : NULL, &newpath)) == NULL)
1443 ppy_error("Unable to open include file %s", fname+1);
1445 fname[n-1] = *fname; /* Redo the quotes */
1446 push_buffer(NULL, newpath, fname, 0);
1447 pp_incl_state.seen_junk = 0;
1448 pp_incl_state.state = 0;
1449 pp_incl_state.ppp = NULL;
1451 if(pp_status.debug)
1452 fprintf(stderr, "pp_do_include: %s:%d: include_state=%d, include_ppp='%s', include_ifdepth=%d\n",
1453 pp_status.input, pp_status.line_number, pp_incl_state.state, pp_incl_state.ppp, pp_incl_state.ifdepth);
1454 ppy__switch_to_buffer(ppy__create_buffer(ppy_in, YY_BUF_SIZE));
1456 fprintf(ppy_out, "# 1 \"%s\" 1%s\n", newpath, type ? "" : " 3");
1457 }
1459 /*
1460 *-------------------------------------------------------------------------
1461 * Push/pop preprocessor ignore state when processing conditionals
1462 * which are false.
1463 *-------------------------------------------------------------------------
1464 */
1465 void pp_push_ignore_state(void)
1466 {
1467 yy_push_state(pp_ignore);
1468 }
1470 void pp_pop_ignore_state(void)
1471 {
1472 yy_pop_state();
1473 }