1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
|
/* CPP main program, using CPP Library.
Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002
Free Software Foundation, Inc.
Written by Per Bothner, 1994-95.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding! */
#include "config.h"
#include "system.h"
#include "cpplib.h"
#include "intl.h"
/* Encapsulates state used to convert the stream of tokens coming from
cpp_get_token back into a text file. */
struct printer
{
FILE *outf; /* Stream to write to. */
const struct line_map *map; /* Logical to physical line mappings. */
const cpp_token *prev; /* Previous token. */
const cpp_token *source; /* Source token for spacing. */
unsigned int line; /* Line currently being written. */
unsigned char printed; /* Nonzero if something output at line. */
};
int main PARAMS ((int, char **));
static void general_init PARAMS ((const char *));
static void do_preprocessing PARAMS ((int, char **));
static void setup_callbacks PARAMS ((void));
/* General output routines. */
static void scan_translation_unit PARAMS ((cpp_reader *));
static void check_multiline_token PARAMS ((const cpp_string *));
static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
static void print_line PARAMS ((const struct line_map *, unsigned int,
const char *));
static void maybe_print_line PARAMS ((const struct line_map *, unsigned int));
/* Callback routines for the parser. Most of these are active only
in specific modes. */
static void cb_line_change PARAMS ((cpp_reader *, const cpp_token *, int));
static void cb_define PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
static void cb_undef PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
static void cb_include PARAMS ((cpp_reader *, unsigned int,
const unsigned char *, const cpp_token *));
static void cb_ident PARAMS ((cpp_reader *, unsigned int,
const cpp_string *));
static void cb_file_change PARAMS ((cpp_reader *, const struct line_map *));
static void cb_def_pragma PARAMS ((cpp_reader *, unsigned int));
const char *progname; /* Needs to be global. */
static cpp_reader *pfile; /* An opaque handle. */
static cpp_options *options; /* Options of pfile. */
static struct printer print;
int
main (argc, argv)
int argc;
char **argv;
{
general_init (argv[0]);
/* Construct a reader with default language GNU C89. */
pfile = cpp_create_reader (CLK_GNUC89);
options = cpp_get_options (pfile);
do_preprocessing (argc, argv);
if (cpp_destroy (pfile))
return FATAL_EXIT_CODE;
return SUCCESS_EXIT_CODE;
}
/* Store the program name, and set the locale. */
static void
general_init (argv0)
const char *argv0;
{
progname = argv0 + strlen (argv0);
while (progname != argv0 && ! IS_DIR_SEPARATOR (progname[-1]))
--progname;
xmalloc_set_program_name (progname);
hex_init ();
gcc_init_libintl ();
}
/* Handle switches, preprocess and output. */
static void
do_preprocessing (argc, argv)
int argc;
char **argv;
{
int argi = 1; /* Next argument to handle. */
argi += cpp_handle_options (pfile, argc - argi , argv + argi);
if (CPP_FATAL_ERRORS (pfile))
return;
if (argi < argc)
{
cpp_fatal (pfile, "invalid option %s", argv[argi]);
return;
}
cpp_post_options (pfile);
if (CPP_FATAL_ERRORS (pfile))
return;
/* If cpp_handle_options saw --help or --version on the command
line, it will have set pfile->help_only to indicate this. Exit
successfully. [The library does not exit itself, because
e.g. cc1 needs to print its own --help message at this point.] */
if (options->help_only)
return;
/* Initialize the printer structure. Setting print.line to -1 here
is a trick to guarantee that the first token of the file will
cause a linemarker to be output by maybe_print_line. */
print.line = (unsigned int) -1;
print.printed = 0;
print.prev = 0;
print.map = 0;
/* Open the output now. We must do so even if no_output is on,
because there may be other output than from the actual
preprocessing (e.g. from -dM). */
if (options->out_fname[0] == '\0')
print.outf = stdout;
else
{
print.outf = fopen (options->out_fname, "w");
if (print.outf == NULL)
{
cpp_notice_from_errno (pfile, options->out_fname);
return;
}
}
setup_callbacks ();
if (cpp_read_main_file (pfile, options->in_fname, NULL))
{
cpp_finish_options (pfile);
/* A successful cpp_read_main_file guarantees that we can call
cpp_scan_nooutput or cpp_get_token next. */
if (options->no_output)
cpp_scan_nooutput (pfile);
else
scan_translation_unit (pfile);
/* -dM command line option. Should this be in cpp_finish? */
if (options->dump_macros == dump_only)
cpp_forall_identifiers (pfile, dump_macro, NULL);
cpp_finish (pfile);
}
/* Flush any pending output. */
if (print.printed)
putc ('\n', print.outf);
if (ferror (print.outf) || fclose (print.outf))
cpp_notice_from_errno (pfile, options->out_fname);
}
/* Set up the callbacks as appropriate. */
static void
setup_callbacks ()
{
cpp_callbacks *cb = cpp_get_callbacks (pfile);
if (! options->no_output)
{
cb->line_change = cb_line_change;
/* Don't emit #pragma or #ident directives if we are processing
assembly language; the assembler may choke on them. */
if (options->lang != CLK_ASM)
{
cb->ident = cb_ident;
cb->def_pragma = cb_def_pragma;
}
if (! options->no_line_commands)
cb->file_change = cb_file_change;
}
if (options->dump_includes)
cb->include = cb_include;
if (options->dump_macros == dump_names
|| options->dump_macros == dump_definitions)
{
cb->define = cb_define;
cb->undef = cb_undef;
}
}
/* Writes out the preprocessed file, handling spacing and paste
avoidance issues. */
static void
scan_translation_unit (pfile)
cpp_reader *pfile;
{
bool avoid_paste = false;
print.source = NULL;
for (;;)
{
const cpp_token *token = cpp_get_token (pfile);
if (token->type == CPP_PADDING)
{
avoid_paste = true;
if (print.source == NULL
|| (!(print.source->flags & PREV_WHITE)
&& token->val.source == NULL))
print.source = token->val.source;
continue;
}
if (token->type == CPP_EOF)
break;
/* Subtle logic to output a space if and only if necessary. */
if (avoid_paste)
{
if (print.source == NULL)
print.source = token;
if (print.source->flags & PREV_WHITE
|| (print.prev && cpp_avoid_paste (pfile, print.prev, token))
|| (print.prev == NULL && token->type == CPP_HASH))
putc (' ', print.outf);
}
else if (token->flags & PREV_WHITE)
putc (' ', print.outf);
avoid_paste = false;
print.source = NULL;
print.prev = token;
cpp_output_token (token, print.outf);
if (token->type == CPP_STRING || token->type == CPP_WSTRING
|| token->type == CPP_COMMENT)
check_multiline_token (&token->val.str);
}
}
/* Adjust print.line for newlines embedded in tokens. */
static void
check_multiline_token (str)
const cpp_string *str;
{
unsigned int i;
for (i = 0; i < str->len; i++)
if (str->text[i] == '\n')
print.line++;
}
/* If the token read on logical line LINE needs to be output on a
different line to the current one, output the required newlines or
a line marker, and return 1. Otherwise return 0. */
static void
maybe_print_line (map, line)
const struct line_map *map;
unsigned int line;
{
/* End the previous line of text. */
if (print.printed)
{
putc ('\n', print.outf);
print.line++;
print.printed = 0;
}
if (line >= print.line && line < print.line + 8)
{
while (line > print.line)
{
putc ('\n', print.outf);
print.line++;
}
}
else
print_line (map, line, "");
}
/* Output a line marker for logical line LINE. Special flags are "1"
or "2" indicating entering or leaving a file. */
static void
print_line (map, line, special_flags)
const struct line_map *map;
unsigned int line;
const char *special_flags;
{
/* End any previous line of text. */
if (print.printed)
putc ('\n', print.outf);
print.printed = 0;
print.line = line;
if (! options->no_line_commands)
{
size_t to_file_len = strlen (map->to_file);
unsigned char *to_file_quoted = alloca (to_file_len * 4 + 1);
unsigned char *p;
/* cpp_quote_string does not nul-terminate, so we have to do it
ourselves. */
p = cpp_quote_string (to_file_quoted,
(unsigned char *)map->to_file, to_file_len);
*p = '\0';
fprintf (print.outf, "# %u \"%s\"%s",
SOURCE_LINE (map, print.line), to_file_quoted, special_flags);
if (map->sysp == 2)
fputs (" 3 4", print.outf);
else if (map->sysp == 1)
fputs (" 3", print.outf);
putc ('\n', print.outf);
}
}
/* Called when a line of output is started. TOKEN is the first token
of the line, and at end of file will be CPP_EOF. */
static void
cb_line_change (pfile, token, parsing_args)
cpp_reader *pfile ATTRIBUTE_UNUSED;
const cpp_token *token;
int parsing_args;
{
if (token->type == CPP_EOF || parsing_args)
return;
maybe_print_line (print.map, token->line);
print.printed = 1;
print.prev = 0;
print.source = 0;
/* Supply enough spaces to put this token in its original column,
one space per column greater than 2, since scan_translation_unit
will provide a space if PREV_WHITE. Don't bother trying to
reconstruct tabs; we can't get it right in general, and nothing
ought to care. Some things do care; the fault lies with them. */
if (token->col > 2)
{
unsigned int spaces = token->col - 2;
while (spaces--)
putc (' ', print.outf);
}
}
static void
cb_ident (pfile, line, str)
cpp_reader *pfile ATTRIBUTE_UNUSED;
unsigned int line;
const cpp_string * str;
{
maybe_print_line (print.map, line);
fprintf (print.outf, "#ident \"%s\"\n", str->text);
print.line++;
}
static void
cb_define (pfile, line, node)
cpp_reader *pfile;
unsigned int line;
cpp_hashnode *node;
{
maybe_print_line (print.map, line);
fputs ("#define ", print.outf);
/* -dD command line option. */
if (options->dump_macros == dump_definitions)
fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
else
fputs ((const char *) NODE_NAME (node), print.outf);
putc ('\n', print.outf);
print.line++;
}
static void
cb_undef (pfile, line, node)
cpp_reader *pfile ATTRIBUTE_UNUSED;
unsigned int line;
cpp_hashnode *node;
{
maybe_print_line (print.map, line);
fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
print.line++;
}
static void
cb_include (pfile, line, dir, header)
cpp_reader *pfile;
unsigned int line;
const unsigned char *dir;
const cpp_token *header;
{
maybe_print_line (print.map, line);
fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
print.line++;
}
/* The file name, line number or system header flags have changed, as
described in MAP. From this point on, the old print.map might be
pointing to freed memory, and so must not be dereferenced. */
static void
cb_file_change (pfile, map)
cpp_reader *pfile ATTRIBUTE_UNUSED;
const struct line_map *map;
{
const char *flags = "";
/* First time? */
if (print.map == NULL)
{
/* Avoid printing foo.i when the main file is foo.c. */
if (!options->preprocessed)
print_line (map, map->from_line, flags);
}
else
{
/* Bring current file to correct line when entering a new file. */
if (map->reason == LC_ENTER)
maybe_print_line (map - 1, map->from_line - 1);
if (map->reason == LC_ENTER)
flags = " 1";
else if (map->reason == LC_LEAVE)
flags = " 2";
print_line (map, map->from_line, flags);
}
print.map = map;
}
/* Copy a #pragma directive to the preprocessed output. */
static void
cb_def_pragma (pfile, line)
cpp_reader *pfile;
unsigned int line;
{
maybe_print_line (print.map, line);
fputs ("#pragma ", print.outf);
cpp_output_line (pfile, print.outf);
print.line++;
}
/* Dump out the hash table. */
static int
dump_macro (pfile, node, v)
cpp_reader *pfile;
cpp_hashnode *node;
void *v ATTRIBUTE_UNUSED;
{
if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
{
fputs ("#define ", print.outf);
fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
putc ('\n', print.outf);
print.line++;
}
return 1;
}
|