1 /* CPP main program, using CPP Library.
2 Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Written by Per Bothner, 1994-95.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 This program 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
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 In other words, you are welcome to use, share and improve this program.
21 You are forbidden to forbid anyone else to use, share and improve
22 what you give them. Help stamp out software-hoarding! */
29 /* Encapsulates state used to convert the stream of tokens coming from
30 cpp_get_token back into a text file. */
33 FILE *outf; /* Stream to write to. */
34 const struct line_map *map; /* Logical to physical line mappings. */
35 const cpp_token *prev; /* Previous token. */
36 const cpp_token *source; /* Source token for spacing. */
37 unsigned int line; /* Line currently being written. */
38 unsigned char printed; /* Nonzero if something output at line. */
41 int main PARAMS ((int, char **));
42 static void general_init PARAMS ((const char *));
43 static void do_preprocessing PARAMS ((int, char **));
44 static void setup_callbacks PARAMS ((void));
46 /* General output routines. */
47 static void scan_translation_unit PARAMS ((cpp_reader *));
48 static void check_multiline_token PARAMS ((const cpp_string *));
49 static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
51 static void print_line PARAMS ((const struct line_map *, unsigned int,
53 static void maybe_print_line PARAMS ((const struct line_map *, unsigned int));
55 /* Callback routines for the parser. Most of these are active only
57 static void cb_line_change PARAMS ((cpp_reader *, const cpp_token *, int));
58 static void cb_define PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
59 static void cb_undef PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
60 static void cb_include PARAMS ((cpp_reader *, unsigned int,
61 const unsigned char *, const cpp_token *));
62 static void cb_ident PARAMS ((cpp_reader *, unsigned int,
64 static void cb_file_change PARAMS ((cpp_reader *, const struct line_map *));
65 static void cb_def_pragma PARAMS ((cpp_reader *, unsigned int));
67 const char *progname; /* Needs to be global. */
68 static cpp_reader *pfile; /* An opaque handle. */
69 static cpp_options *options; /* Options of pfile. */
70 static struct printer print;
77 general_init (argv[0]);
79 /* Contruct a reader with default language GNU C89. */
80 pfile = cpp_create_reader (NULL, CLK_GNUC89);
81 options = cpp_get_options (pfile);
83 do_preprocessing (argc, argv);
85 if (cpp_destroy (pfile))
86 return FATAL_EXIT_CODE;
88 return SUCCESS_EXIT_CODE;
91 /* Store the program name, and set the locale. */
96 progname = argv0 + strlen (argv0);
98 while (progname != argv0 && ! IS_DIR_SEPARATOR (progname[-1]))
101 xmalloc_set_program_name (progname);
103 /* LC_CTYPE determines the character set used by the terminal so it
104 has to be set to output messages correctly. */
106 #ifdef HAVE_LC_MESSAGES
107 setlocale (LC_CTYPE, "");
108 setlocale (LC_MESSAGES, "");
110 setlocale (LC_ALL, "");
113 (void) bindtextdomain (PACKAGE, localedir);
114 (void) textdomain (PACKAGE);
117 /* Handle switches, preprocess and output. */
119 do_preprocessing (argc, argv)
123 int argi = 1; /* Next argument to handle. */
125 argi += cpp_handle_options (pfile, argc - argi , argv + argi);
126 if (CPP_FATAL_ERRORS (pfile))
130 cpp_fatal (pfile, "Invalid option %s", argv[argi]);
132 cpp_post_options (pfile);
134 if (CPP_FATAL_ERRORS (pfile))
137 /* If cpp_handle_options saw --help or --version on the command
138 line, it will have set pfile->help_only to indicate this. Exit
139 successfully. [The library does not exit itself, because
140 e.g. cc1 needs to print its own --help message at this point.] */
141 if (options->help_only)
144 /* Initialize the printer structure. Setting print.line to -1 here
145 is a trick to guarantee that the first token of the file will
146 cause a linemarker to be output by maybe_print_line. */
147 print.line = (unsigned int) -1;
152 /* Open the output now. We must do so even if no_output is on,
153 because there may be other output than from the actual
154 preprocessing (e.g. from -dM). */
155 if (options->out_fname[0] == '\0')
159 print.outf = fopen (options->out_fname, "w");
160 if (print.outf == NULL)
162 cpp_notice_from_errno (pfile, options->out_fname);
169 if (cpp_start_read (pfile, options->in_fname))
171 /* A successful cpp_start_read guarantees that we can call
172 cpp_scan_nooutput or cpp_get_token next. */
173 if (options->no_output)
174 cpp_scan_nooutput (pfile);
176 scan_translation_unit (pfile);
178 /* -dM command line option. Should this be in cpp_finish? */
179 if (options->dump_macros == dump_only)
180 cpp_forall_identifiers (pfile, dump_macro, NULL);
185 /* Flush any pending output. */
187 putc ('\n', print.outf);
189 if (ferror (print.outf) || fclose (print.outf))
190 cpp_notice_from_errno (pfile, options->out_fname);
193 /* Set up the callbacks as appropriate. */
197 cpp_callbacks *cb = cpp_get_callbacks (pfile);
199 if (! options->no_output)
201 cb->line_change = cb_line_change;
202 cb->ident = cb_ident;
203 cb->def_pragma = cb_def_pragma;
204 if (! options->no_line_commands)
205 cb->file_change = cb_file_change;
208 if (options->dump_includes)
209 cb->include = cb_include;
211 if (options->dump_macros == dump_names
212 || options->dump_macros == dump_definitions)
214 cb->define = cb_define;
215 cb->undef = cb_undef;
219 /* Writes out the preprocessed file, handling spacing and paste
222 scan_translation_unit (pfile)
225 bool avoid_paste = false;
230 const cpp_token *token = cpp_get_token (pfile);
232 if (token->type == CPP_PADDING)
235 if (print.source == NULL
236 || (!(print.source->flags & PREV_WHITE)
237 && token->val.source == NULL))
238 print.source = token->val.source;
242 if (token->type == CPP_EOF)
245 /* Subtle logic to output a space if and only if necessary. */
248 if (print.source == NULL)
249 print.source = token;
250 if (print.source->flags & PREV_WHITE
251 || (print.prev && cpp_avoid_paste (pfile, print.prev, token))
252 || (print.prev == NULL && token->type == CPP_HASH))
253 putc (' ', print.outf);
255 else if (token->flags & PREV_WHITE)
256 putc (' ', print.outf);
261 cpp_output_token (token, print.outf);
263 if (token->type == CPP_STRING || token->type == CPP_WSTRING
264 || token->type == CPP_COMMENT)
265 check_multiline_token (&token->val.str);
269 /* Adjust print.line for newlines embedded in tokens. */
271 check_multiline_token (str)
272 const cpp_string *str;
276 for (i = 0; i < str->len; i++)
277 if (str->text[i] == '\n')
281 /* If the token read on logical line LINE needs to be output on a
282 different line to the current one, output the required newlines or
283 a line marker, and return 1. Otherwise return 0. */
286 maybe_print_line (map, line)
287 const struct line_map *map;
290 /* End the previous line of text. */
293 putc ('\n', print.outf);
298 if (line >= print.line && line < print.line + 8)
300 while (line > print.line)
302 putc ('\n', print.outf);
307 print_line (map, line, "");
310 /* Output a line marker for logical line LINE. Special flags are "1"
311 or "2" indicating entering or leaving a file. */
313 print_line (map, line, special_flags)
314 const struct line_map *map;
316 const char *special_flags;
318 /* End any previous line of text. */
320 putc ('\n', print.outf);
324 if (! options->no_line_commands)
326 fprintf (print.outf, "# %u \"%s\"%s",
327 SOURCE_LINE (map, print.line), map->to_file, special_flags);
330 fputs (" 3 4", print.outf);
331 else if (map->sysp == 1)
332 fputs (" 3", print.outf);
334 putc ('\n', print.outf);
338 /* Called when a line of output is started. TOKEN is the first token
339 of the line, and may be CPP_EOF. */
342 cb_line_change (pfile, token, parsing_args)
343 cpp_reader *pfile ATTRIBUTE_UNUSED;
344 const cpp_token *token;
347 if (token->type == CPP_EOF || parsing_args)
350 maybe_print_line (print.map, token->line);
355 /* Supply enough spaces to put this token in its original column,
356 one space per column greater than 2, since scan_translation_unit
357 will provide a space if PREV_WHITE. Don't bother trying to
358 reconstruct tabs; we can't get it right in general, and nothing
359 ought to care. Some things do care; the fault lies with them. */
362 unsigned int spaces = token->col - 2;
365 putc (' ', print.outf);
370 cb_ident (pfile, line, str)
371 cpp_reader *pfile ATTRIBUTE_UNUSED;
373 const cpp_string * str;
375 maybe_print_line (print.map, line);
376 fprintf (print.outf, "#ident \"%s\"\n", str->text);
381 cb_define (pfile, line, node)
386 maybe_print_line (print.map, line);
387 fputs ("#define ", print.outf);
389 /* -dD command line option. */
390 if (options->dump_macros == dump_definitions)
391 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
393 fputs ((const char *) NODE_NAME (node), print.outf);
395 putc ('\n', print.outf);
400 cb_undef (pfile, line, node)
401 cpp_reader *pfile ATTRIBUTE_UNUSED;
405 maybe_print_line (print.map, line);
406 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
411 cb_include (pfile, line, dir, header)
414 const unsigned char *dir;
415 const cpp_token *header;
417 maybe_print_line (print.map, line);
418 fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
422 /* The file name, line number or system header flags have changed, as
423 described in MAP. From this point on, the old print.map might be
424 pointing to freed memory, and so must not be dereferenced. */
427 cb_file_change (pfile, map)
428 cpp_reader *pfile ATTRIBUTE_UNUSED;
429 const struct line_map *map;
431 const char *flags = "";
434 if (print.map == NULL)
436 /* Avoid printing foo.i when the main file is foo.c. */
437 if (!options->preprocessed)
438 print_line (map, map->from_line, flags);
442 /* Bring current file to correct line when entering a new file. */
443 if (map->reason == LC_ENTER)
444 maybe_print_line (map - 1, map->from_line - 1);
446 if (map->reason == LC_ENTER)
448 else if (map->reason == LC_LEAVE)
450 print_line (map, map->from_line, flags);
456 /* Copy a #pragma directive to the preprocessed output. */
458 cb_def_pragma (pfile, line)
462 maybe_print_line (print.map, line);
463 fputs ("#pragma ", print.outf);
464 cpp_output_line (pfile, print.outf);
468 /* Dump out the hash table. */
470 dump_macro (pfile, node, v)
473 void *v ATTRIBUTE_UNUSED;
475 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
477 fputs ("#define ", print.outf);
478 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
479 putc ('\n', print.outf);