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 char *syshdr_flags; /* System header flags, if any. */
35 unsigned int line; /* Line currently being written. */
36 unsigned char printed; /* Nonzero if something output at line. */
37 struct line_map *map; /* Logical to physical line mappings. */
40 int main PARAMS ((int, char **));
41 static void general_init PARAMS ((const char *));
42 static void do_preprocessing PARAMS ((int, char **));
43 static void setup_callbacks PARAMS ((void));
45 /* General output routines. */
46 static void scan_translation_unit PARAMS ((cpp_reader *));
47 static void check_multiline_token PARAMS ((cpp_string *));
48 static void printer_init PARAMS ((void));
49 static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
51 static void print_line PARAMS ((unsigned int, const char *));
52 static void maybe_print_line PARAMS ((unsigned int));
54 /* Callback routines for the parser. Most of these are active only
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 cpp_file_change *));
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 /* Open the output now. We must do so even if no_output is on,
143 because there may be other output than from the actual
144 preprocessing (e.g. from -dM). */
146 if (print.outf == NULL)
148 cpp_notice_from_errno (pfile, options->out_fname);
154 if (cpp_start_read (pfile, options->in_fname))
156 /* A successful cpp_start_read guarantees that we can call
157 cpp_scan_nooutput or cpp_get_token next. */
158 if (options->no_output)
159 cpp_scan_nooutput (pfile);
161 scan_translation_unit (pfile);
163 /* -dM command line option. Should this be in cpp_finish? */
164 if (options->dump_macros == dump_only)
165 cpp_forall_identifiers (pfile, dump_macro, NULL);
170 /* Flush any pending output. */
172 putc ('\n', print.outf);
174 if (ferror (print.outf) || fclose (print.outf))
175 cpp_notice_from_errno (pfile, options->out_fname);
178 /* Set up the callbacks as appropriate. */
182 cpp_callbacks *cb = cpp_get_callbacks (pfile);
184 if (! options->no_output)
186 cb->ident = cb_ident;
187 cb->def_pragma = cb_def_pragma;
188 if (! options->no_line_commands)
189 cb->file_change = cb_file_change;
192 if (options->dump_includes)
193 cb->include = cb_include;
195 if (options->dump_macros == dump_names
196 || options->dump_macros == dump_definitions)
198 cb->define = cb_define;
199 cb->undef = cb_undef;
203 /* Writes out the preprocessed file. Alternates between two tokens,
204 so that we can avoid accidental token pasting. */
206 scan_translation_unit (pfile)
209 unsigned int index, line;
210 cpp_token tokens[2], *token;
212 for (index = 0;; index = 1 - index)
214 token = &tokens[index];
215 cpp_get_token (pfile, token);
217 if (token->type == CPP_EOF)
220 line = cpp_get_line (pfile)->output_line;
221 if (print.line != line)
223 unsigned int col = cpp_get_line (pfile)->col;
225 /* Supply enough whitespace to put this token in its original
226 column. Don't bother trying to reconstruct tabs; we can't
227 get it right in general, and nothing ought to care. (Yes,
228 some things do care; the fault lies with them.) */
229 maybe_print_line (line);
232 if (token->flags & PREV_WHITE)
235 putc (' ', print.outf);
238 else if ((token->flags & (PREV_WHITE | AVOID_LPASTE))
240 && cpp_avoid_paste (pfile, &tokens[1 - index], token))
241 token->flags |= PREV_WHITE;
242 /* Special case '# <directive name>': insert a space between
243 the # and the token. This will prevent it from being
244 treated as a directive when this code is re-preprocessed.
245 XXX Should do this only at the beginning of a line, but how? */
246 else if (token->type == CPP_NAME && token->val.node->directive_index
247 && tokens[1 - index].type == CPP_HASH)
248 token->flags |= PREV_WHITE;
250 cpp_output_token (token, print.outf);
252 if (token->type == CPP_STRING || token->type == CPP_WSTRING
253 || token->type == CPP_COMMENT)
254 check_multiline_token (&token->val.str);
258 /* Adjust print.line for newlines embedded in tokens. */
260 check_multiline_token (str)
265 for (i = 0; i < str->len; i++)
266 if (str->text[i] == '\n')
270 /* Initialize a cpp_printer structure. As a side effect, open the
271 output file. If print.outf is NULL an error occurred. */
275 /* Setting print.line to -1 here guarantees that the first token of
276 the file will cause a linemarker to be output by maybe_print_line. */
277 print.line = (unsigned int) -1;
281 if (options->out_fname[0] == '\0')
284 print.outf = fopen (options->out_fname, "w");
287 /* If the token read on logical line LINE needs to be output on a
288 different line to the current one, output the required newlines or
289 a line marker, and return 1. Otherwise return 0. */
292 maybe_print_line (line)
295 /* End the previous line of text. */
298 putc ('\n', print.outf);
303 if (line >= print.line && line < print.line + 8)
305 while (line > print.line)
307 putc ('\n', print.outf);
312 print_line (line, "");
316 print_line (line, special_flags)
318 const char *special_flags;
320 /* End any previous line of text. */
322 putc ('\n', print.outf);
326 if (! options->no_line_commands)
327 fprintf (print.outf, "# %u \"%s\"%s%s\n",
328 SOURCE_LINE (print.map, print.line),
329 print.map->to_file, special_flags, print.syshdr_flags);
335 cb_ident (pfile, line, str)
336 cpp_reader *pfile ATTRIBUTE_UNUSED;
338 const cpp_string * str;
340 maybe_print_line (line);
341 fprintf (print.outf, "#ident \"%s\"\n", str->text);
346 cb_define (pfile, line, node)
351 maybe_print_line (line);
352 fputs ("#define ", print.outf);
354 /* -dD command line option. */
355 if (options->dump_macros == dump_definitions)
356 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
358 fputs ((const char *) NODE_NAME (node), print.outf);
360 putc ('\n', print.outf);
365 cb_undef (pfile, line, node)
366 cpp_reader *pfile ATTRIBUTE_UNUSED;
370 maybe_print_line (line);
371 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
376 cb_include (pfile, line, dir, header)
379 const unsigned char *dir;
380 const cpp_token *header;
382 maybe_print_line (line);
383 fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
388 cb_file_change (pfile, fc)
389 cpp_reader *pfile ATTRIBUTE_UNUSED;
390 const cpp_file_change *fc;
392 bool first_time = print.map == NULL;
394 /* Bring current file to correct line. We handle the first file
395 change callback specially, so that a first line of "# 1 "foo.c"
396 in file foo.i outputs just the foo.c line, and not a foo.i line. */
397 if (fc->reason == LC_ENTER && !first_time)
398 maybe_print_line (fc->line - 1);
402 print.syshdr_flags = " 3 4";
404 print.syshdr_flags = " 3";
406 print.syshdr_flags = "";
410 const char *flags = "";
412 if (fc->reason == LC_ENTER)
414 else if (fc->reason == LC_LEAVE)
417 print_line (fc->line, flags);
421 /* Copy a #pragma directive to the preprocessed output. LINE is the
422 line of the current source file, not the logical line. */
424 cb_def_pragma (pfile, line)
428 maybe_print_line (line);
429 fputs ("#pragma ", print.outf);
430 cpp_output_line (pfile, print.outf);
434 /* Dump out the hash table. */
436 dump_macro (pfile, node, v)
439 void *v ATTRIBUTE_UNUSED;
441 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
443 fputs ("#define ", print.outf);
444 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
445 putc ('\n', print.outf);