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 unsigned int line; /* Line currently being written. */
36 unsigned char printed; /* Nonzero if something output at line. */
39 int main PARAMS ((int, char **));
40 static void general_init PARAMS ((const char *));
41 static void do_preprocessing PARAMS ((int, char **));
42 static void setup_callbacks PARAMS ((void));
44 /* General output routines. */
45 static void scan_translation_unit PARAMS ((cpp_reader *));
46 static void check_multiline_token PARAMS ((cpp_string *));
47 static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
49 static void print_line PARAMS ((const struct line_map *, unsigned int,
51 static void maybe_print_line PARAMS ((const struct line_map *, unsigned int));
53 /* Callback routines for the parser. Most of these are active only
55 static void cb_line_change PARAMS ((cpp_reader *, const cpp_token *, int));
56 static void cb_define PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
57 static void cb_undef PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
58 static void cb_include PARAMS ((cpp_reader *, unsigned int,
59 const unsigned char *, const cpp_token *));
60 static void cb_ident PARAMS ((cpp_reader *, unsigned int,
62 static void cb_file_change PARAMS ((cpp_reader *, const struct line_map *));
63 static void cb_def_pragma PARAMS ((cpp_reader *, unsigned int));
65 const char *progname; /* Needs to be global. */
66 static cpp_reader *pfile; /* An opaque handle. */
67 static cpp_options *options; /* Options of pfile. */
68 static struct printer print;
75 general_init (argv[0]);
77 /* Contruct a reader with default language GNU C89. */
78 pfile = cpp_create_reader (NULL, CLK_GNUC89);
79 options = cpp_get_options (pfile);
81 do_preprocessing (argc, argv);
83 if (cpp_destroy (pfile))
84 return FATAL_EXIT_CODE;
86 return SUCCESS_EXIT_CODE;
89 /* Store the program name, and set the locale. */
94 progname = argv0 + strlen (argv0);
96 while (progname != argv0 && ! IS_DIR_SEPARATOR (progname[-1]))
99 xmalloc_set_program_name (progname);
101 /* LC_CTYPE determines the character set used by the terminal so it
102 has to be set to output messages correctly. */
104 #ifdef HAVE_LC_MESSAGES
105 setlocale (LC_CTYPE, "");
106 setlocale (LC_MESSAGES, "");
108 setlocale (LC_ALL, "");
111 (void) bindtextdomain (PACKAGE, localedir);
112 (void) textdomain (PACKAGE);
115 /* Handle switches, preprocess and output. */
117 do_preprocessing (argc, argv)
121 int argi = 1; /* Next argument to handle. */
123 argi += cpp_handle_options (pfile, argc - argi , argv + argi);
124 if (CPP_FATAL_ERRORS (pfile))
128 cpp_fatal (pfile, "Invalid option %s", argv[argi]);
130 cpp_post_options (pfile);
132 if (CPP_FATAL_ERRORS (pfile))
135 /* If cpp_handle_options saw --help or --version on the command
136 line, it will have set pfile->help_only to indicate this. Exit
137 successfully. [The library does not exit itself, because
138 e.g. cc1 needs to print its own --help message at this point.] */
139 if (options->help_only)
142 /* Initialize the printer structure. Setting print.line to -1 here
143 is a trick to guarantee that the first token of the file will
144 cause a linemarker to be output by maybe_print_line. */
145 print.line = (unsigned int) -1;
149 /* Open the output now. We must do so even if no_output is on,
150 because there may be other output than from the actual
151 preprocessing (e.g. from -dM). */
152 if (options->out_fname[0] == '\0')
156 print.outf = fopen (options->out_fname, "w");
157 if (print.outf == NULL)
159 cpp_notice_from_errno (pfile, options->out_fname);
166 if (cpp_start_read (pfile, options->in_fname))
168 /* A successful cpp_start_read guarantees that we can call
169 cpp_scan_nooutput or cpp_get_token next. */
170 if (options->no_output)
171 cpp_scan_nooutput (pfile);
173 scan_translation_unit (pfile);
175 /* -dM command line option. Should this be in cpp_finish? */
176 if (options->dump_macros == dump_only)
177 cpp_forall_identifiers (pfile, dump_macro, NULL);
182 /* Flush any pending output. */
184 putc ('\n', print.outf);
186 if (ferror (print.outf) || fclose (print.outf))
187 cpp_notice_from_errno (pfile, options->out_fname);
190 /* Set up the callbacks as appropriate. */
194 cpp_callbacks *cb = cpp_get_callbacks (pfile);
196 if (! options->no_output)
198 cb->line_change = cb_line_change;
199 cb->ident = cb_ident;
200 cb->def_pragma = cb_def_pragma;
201 if (! options->no_line_commands)
202 cb->file_change = cb_file_change;
205 if (options->dump_includes)
206 cb->include = cb_include;
208 if (options->dump_macros == dump_names
209 || options->dump_macros == dump_definitions)
211 cb->define = cb_define;
212 cb->undef = cb_undef;
216 /* Writes out the preprocessed file. Alternates between two tokens,
217 so that we can avoid accidental token pasting. */
219 scan_translation_unit (pfile)
223 cpp_token tokens[2], *token;
225 for (index = 0;; index = 1 - index)
227 token = &tokens[index];
228 cpp_get_token (pfile, token);
230 if (token->type == CPP_EOF)
233 if ((token->flags & (PREV_WHITE | AVOID_LPASTE | BOL)) == AVOID_LPASTE
234 && cpp_avoid_paste (pfile, &tokens[1 - index], token))
235 token->flags |= PREV_WHITE;
237 cpp_output_token (token, print.outf);
238 if (token->type == CPP_STRING || token->type == CPP_WSTRING
239 || token->type == CPP_COMMENT)
240 check_multiline_token (&token->val.str);
244 /* Adjust print.line for newlines embedded in tokens. */
246 check_multiline_token (str)
251 for (i = 0; i < str->len; i++)
252 if (str->text[i] == '\n')
256 /* If the token read on logical line LINE needs to be output on a
257 different line to the current one, output the required newlines or
258 a line marker, and return 1. Otherwise return 0. */
261 maybe_print_line (map, line)
262 const struct line_map *map;
265 /* End the previous line of text. */
268 putc ('\n', print.outf);
273 if (line >= print.line && line < print.line + 8)
275 while (line > print.line)
277 putc ('\n', print.outf);
282 print_line (map, line, "");
285 /* Output a line marker for logical line LINE. Special flags are "1"
286 or "2" indicating entering or leaving a file. */
288 print_line (map, line, special_flags)
289 const struct line_map *map;
291 const char *special_flags;
293 /* End any previous line of text. */
295 putc ('\n', print.outf);
299 if (! options->no_line_commands)
301 fprintf (print.outf, "# %u \"%s\"%s",
302 SOURCE_LINE (map, print.line), map->to_file, special_flags);
305 fputs (" 3 4", print.outf);
306 else if (map->sysp == 1)
307 fputs (" 3", print.outf);
309 putc ('\n', print.outf);
313 /* Called when a line of output is started. TOKEN is the first token
314 of the line, and maybe be CPP_EOF. */
317 cb_line_change (pfile, token, parsing_args)
318 cpp_reader *pfile ATTRIBUTE_UNUSED;
319 const cpp_token *token;
322 if (token->type == CPP_EOF || parsing_args)
325 maybe_print_line (print.map, token->line);
328 /* Supply enough spaces to put this token in its original column,
329 one space per column greater than 2, since scan_translation_unit
330 will provide a space if PREV_WHITE. Don't bother trying to
331 reconstruct tabs; we can't get it right in general, and nothing
332 ought to care. Some things do care; the fault lies with them. */
335 unsigned int spaces = token->col - 2;
338 putc (' ', print.outf);
343 cb_ident (pfile, line, str)
344 cpp_reader *pfile ATTRIBUTE_UNUSED;
346 const cpp_string * str;
348 maybe_print_line (print.map, line);
349 fprintf (print.outf, "#ident \"%s\"\n", str->text);
354 cb_define (pfile, line, node)
359 maybe_print_line (print.map, line);
360 fputs ("#define ", print.outf);
362 /* -dD command line option. */
363 if (options->dump_macros == dump_definitions)
364 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
366 fputs ((const char *) NODE_NAME (node), print.outf);
368 putc ('\n', print.outf);
373 cb_undef (pfile, line, node)
374 cpp_reader *pfile ATTRIBUTE_UNUSED;
378 maybe_print_line (print.map, line);
379 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
384 cb_include (pfile, line, dir, header)
387 const unsigned char *dir;
388 const cpp_token *header;
390 maybe_print_line (print.map, line);
391 fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
395 /* The file name, line number or system header flags have changed, as
396 described in MAP. From this point on, the old print.map might be
397 pointing to freed memory, and so must not be dereferenced. */
400 cb_file_change (pfile, map)
401 cpp_reader *pfile ATTRIBUTE_UNUSED;
402 const struct line_map *map;
404 const char *flags = "";
407 if (print.map == NULL)
409 /* Avoid printing foo.i when the main file is foo.c. */
410 if (!options->preprocessed)
411 print_line (map, map->from_line, flags);
415 /* Bring current file to correct line when entering a new file. */
416 if (map->reason == LC_ENTER)
417 maybe_print_line (map - 1, map->from_line - 1);
419 if (map->reason == LC_ENTER)
421 else if (map->reason == LC_LEAVE)
423 print_line (map, map->from_line, flags);
429 /* Copy a #pragma directive to the preprocessed output. */
431 cb_def_pragma (pfile, line)
435 maybe_print_line (print.map, line);
436 fputs ("#pragma ", print.outf);
437 cpp_output_line (pfile, print.outf);
441 /* Dump out the hash table. */
443 dump_macro (pfile, node, v)
446 void *v ATTRIBUTE_UNUSED;
448 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
450 fputs ("#define ", print.outf);
451 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
452 putc ('\n', print.outf);