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 *filename; /* Name of current file. */
35 const char *syshdr_flags; /* System header flags, if any. */
36 unsigned int line; /* Line currently being written. */
37 unsigned char printed; /* Nonzero if something output at line. */
38 struct line_map *map; /* Logical to physical line mappings. */
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 ((cpp_string *));
49 static void printer_init PARAMS ((void));
50 static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
52 static void print_line PARAMS ((unsigned int, const char *));
53 static void maybe_print_line PARAMS ((unsigned int));
55 /* Callback routines for the parser. Most of these are active only
57 static void cb_define PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
58 static void cb_undef PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
59 static void cb_include PARAMS ((cpp_reader *, unsigned int,
60 const unsigned char *, const cpp_token *));
61 static void cb_ident PARAMS ((cpp_reader *, unsigned int,
63 static void cb_file_change PARAMS ((cpp_reader *, const cpp_file_change *));
64 static void cb_def_pragma PARAMS ((cpp_reader *, unsigned int));
66 const char *progname; /* Needs to be global. */
67 static cpp_reader *pfile; /* An opaque handle. */
68 static cpp_options *options; /* Options of pfile. */
69 static struct printer print;
76 general_init (argv[0]);
78 /* Contruct a reader with default language GNU C89. */
79 pfile = cpp_create_reader (NULL, CLK_GNUC89);
80 options = cpp_get_options (pfile);
82 do_preprocessing (argc, argv);
84 /* Call to cpp_destroy () omitted for performance reasons. */
85 if (cpp_errors (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 /* Open the output now. We must do so even if no_output is on,
145 because there may be other output than from the actual
146 preprocessing (e.g. from -dM). */
148 if (print.outf == NULL)
150 cpp_notice_from_errno (pfile, options->out_fname);
156 if (cpp_start_read (pfile, options->in_fname))
158 /* A successful cpp_start_read guarantees that we can call
159 cpp_scan_nooutput or cpp_get_token next. */
160 if (options->no_output)
161 cpp_scan_nooutput (pfile);
163 scan_translation_unit (pfile);
165 /* -dM command line option. Should this be in cpp_finish? */
166 if (options->dump_macros == dump_only)
167 cpp_forall_identifiers (pfile, dump_macro, NULL);
172 /* Flush any pending output. */
174 putc ('\n', print.outf);
176 if (ferror (print.outf) || fclose (print.outf))
177 cpp_notice_from_errno (pfile, options->out_fname);
180 /* Set up the callbacks as appropriate. */
184 cpp_callbacks *cb = cpp_get_callbacks (pfile);
186 if (! options->no_output)
188 cb->ident = cb_ident;
189 cb->def_pragma = cb_def_pragma;
190 if (! options->no_line_commands)
191 cb->file_change = cb_file_change;
194 if (options->dump_includes)
195 cb->include = cb_include;
197 if (options->dump_macros == dump_names
198 || options->dump_macros == dump_definitions)
200 cb->define = cb_define;
201 cb->undef = cb_undef;
205 /* Writes out the preprocessed file. Alternates between two tokens,
206 so that we can avoid accidental token pasting. */
208 scan_translation_unit (pfile)
211 unsigned int index, line;
212 cpp_token tokens[2], *token;
214 for (index = 0;; index = 1 - index)
216 token = &tokens[index];
217 cpp_get_token (pfile, token);
219 if (token->type == CPP_EOF)
222 line = cpp_get_line (pfile)->output_line;
223 if (print.line != line)
225 unsigned int col = cpp_get_line (pfile)->col;
227 /* Supply enough whitespace to put this token in its original
228 column. Don't bother trying to reconstruct tabs; we can't
229 get it right in general, and nothing ought to care. (Yes,
230 some things do care; the fault lies with them.) */
231 maybe_print_line (line);
234 if (token->flags & PREV_WHITE)
237 putc (' ', print.outf);
240 else if ((token->flags & (PREV_WHITE | AVOID_LPASTE))
242 && cpp_avoid_paste (pfile, &tokens[1 - index], token))
243 token->flags |= PREV_WHITE;
244 /* Special case '# <directive name>': insert a space between
245 the # and the token. This will prevent it from being
246 treated as a directive when this code is re-preprocessed.
247 XXX Should do this only at the beginning of a line, but how? */
248 else if (token->type == CPP_NAME && token->val.node->directive_index
249 && tokens[1 - index].type == CPP_HASH)
250 token->flags |= PREV_WHITE;
252 cpp_output_token (token, print.outf);
254 if (token->type == CPP_STRING || token->type == CPP_WSTRING
255 || token->type == CPP_COMMENT)
256 check_multiline_token (&token->val.str);
260 /* Adjust print.line for newlines embedded in tokens. */
262 check_multiline_token (str)
267 for (i = 0; i < str->len; i++)
268 if (str->text[i] == '\n')
272 /* Initialize a cpp_printer structure. As a side effect, open the
273 output file. If print.outf is NULL an error occurred. */
277 /* Setting print.line to -1 here guarantees that the first token of
278 the file will cause a linemarker to be output by maybe_print_line. */
279 print.line = (unsigned int) -1;
283 if (options->out_fname[0] == '\0')
286 print.outf = fopen (options->out_fname, "w");
289 /* If the token read on logical line LINE needs to be output on a
290 different line to the current one, output the required newlines or
291 a line marker, and return 1. Otherwise return 0. */
294 maybe_print_line (line)
297 /* End the previous line of text. */
300 putc ('\n', print.outf);
305 if (line >= print.line && line < print.line + 8)
307 while (line > print.line)
309 putc ('\n', print.outf);
314 print_line (line, "");
318 print_line (line, special_flags)
320 const char *special_flags;
322 /* End any previous line of text. */
324 putc ('\n', print.outf);
328 if (! options->no_line_commands)
329 fprintf (print.outf, "# %u \"%s\"%s%s\n",
330 SOURCE_LINE (print.map, print.line),
331 print.filename, special_flags, print.syshdr_flags);
337 cb_ident (pfile, line, str)
338 cpp_reader *pfile ATTRIBUTE_UNUSED;
340 const cpp_string * str;
342 maybe_print_line (line);
343 fprintf (print.outf, "#ident \"%s\"\n", str->text);
348 cb_define (pfile, line, node)
353 maybe_print_line (line);
354 fputs ("#define ", print.outf);
356 /* -dD command line option. */
357 if (options->dump_macros == dump_definitions)
358 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
360 fputs ((const char *) NODE_NAME (node), print.outf);
362 putc ('\n', print.outf);
367 cb_undef (pfile, line, node)
368 cpp_reader *pfile ATTRIBUTE_UNUSED;
372 maybe_print_line (line);
373 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
378 cb_include (pfile, line, dir, header)
381 const unsigned char *dir;
382 const cpp_token *header;
384 maybe_print_line (line);
385 fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
390 cb_file_change (pfile, fc)
391 cpp_reader *pfile ATTRIBUTE_UNUSED;
392 const cpp_file_change *fc;
394 bool first_time = print.map == NULL;
396 /* Bring current file to correct line. We handle the first file
397 change callback specially, so that a first line of "# 1 "foo.c"
398 in file foo.i outputs just the foo.c line, and not a foo.i line. */
399 if (fc->reason == LC_ENTER && !first_time)
400 maybe_print_line (fc->line - 1);
403 print.filename = fc->map->to_file;
405 print.syshdr_flags = " 3 4";
407 print.syshdr_flags = " 3";
409 print.syshdr_flags = "";
413 const char *flags = "";
415 if (fc->reason == LC_ENTER)
417 else if (fc->reason == LC_LEAVE)
420 print_line (fc->line, flags);
424 /* Copy a #pragma directive to the preprocessed output. LINE is the
425 line of the current source file, not the logical line. */
427 cb_def_pragma (pfile, line)
431 maybe_print_line (line);
432 fputs ("#pragma ", print.outf);
433 cpp_output_line (pfile, print.outf);
437 /* Dump out the hash table. */
439 dump_macro (pfile, node, v)
442 void *v ATTRIBUTE_UNUSED;
444 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
446 fputs ("#define ", print.outf);
447 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
448 putc ('\n', print.outf);