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 *last_fname; /* previous file name. */
35 const char *syshdr_flags; /* system header flags, if any. */
36 unsigned int lineno; /* line currently being written. */
37 unsigned char printed; /* nonzero if something output at lineno. */
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_buffer PARAMS ((cpp_reader *));
47 static void check_multiline_token PARAMS ((cpp_string *));
48 static int printer_init PARAMS ((cpp_reader *));
49 static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
51 static void print_line PARAMS ((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 *, cpp_hashnode *));
57 static void cb_undef PARAMS ((cpp_reader *, cpp_hashnode *));
58 static void cb_include PARAMS ((cpp_reader *, const unsigned char *,
60 static void cb_ident PARAMS ((cpp_reader *, const cpp_string *));
61 static void cb_file_change PARAMS ((cpp_reader *, const cpp_file_change *));
62 static void cb_def_pragma PARAMS ((cpp_reader *));
64 const char *progname; /* Needs to be global. */
65 static cpp_reader *pfile; /* An opaque handle. */
66 static cpp_options *options; /* Options of pfile. */
67 static struct printer print;
74 general_init (argv[0]);
76 /* Contruct a reader with default language GNU C89. */
77 pfile = cpp_create_reader (CLK_GNUC89);
78 options = cpp_get_options (pfile);
80 do_preprocessing (argc, argv);
82 /* Call to cpp_destroy () omitted for performance reasons. */
83 if (cpp_errors (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). */
145 if (printer_init (pfile))
150 if (cpp_start_read (pfile, options->in_fname))
152 /* A successful cpp_start_read guarantees that we can call
153 cpp_scan_buffer_nooutput or cpp_get_token next. */
154 if (options->no_output)
155 cpp_scan_buffer_nooutput (pfile, 1);
159 /* -dM command line option. Should this be in cpp_finish? */
160 if (options->dump_macros == dump_only)
161 cpp_forall_identifiers (pfile, dump_macro, NULL);
166 /* Flush any pending output. */
168 putc ('\n', print.outf);
170 if (ferror (print.outf) || fclose (print.outf))
171 cpp_notice_from_errno (pfile, options->out_fname);
174 /* Set up the callbacks as appropriate. */
178 cpp_callbacks *cb = cpp_get_callbacks (pfile);
180 if (! options->no_output)
182 cb->ident = cb_ident;
183 cb->def_pragma = cb_def_pragma;
184 if (! options->no_line_commands)
185 cb->file_change = cb_file_change;
188 if (options->dump_includes)
189 cb->include = cb_include;
191 if (options->dump_macros == dump_names
192 || options->dump_macros == dump_definitions)
194 cb->define = cb_define;
195 cb->undef = cb_undef;
196 cb->poison = cb_def_pragma;
200 /* Writes out the preprocessed file. Alternates between two tokens,
201 so that we can avoid accidental token pasting. */
206 unsigned int index, line;
207 cpp_token tokens[2], *token;
211 for (index = 0;; index = 1 - index)
213 token = &tokens[index];
214 cpp_get_token (pfile, token);
216 if (token->type == CPP_EOF)
219 line = cpp_get_line (pfile)->output_line;
220 if (print.lineno != line)
222 unsigned int col = cpp_get_line (pfile)->col;
224 /* Supply enough whitespace to put this token in its original
225 column. Don't bother trying to reconstruct tabs; we can't
226 get it right in general, and nothing ought to care. (Yes,
227 some things do care; the fault lies with them.) */
228 maybe_print_line (line);
231 if (token->flags & PREV_WHITE)
234 putc (' ', print.outf);
237 else if ((token->flags & (PREV_WHITE | AVOID_LPASTE))
239 && cpp_avoid_paste (pfile, &tokens[1 - index], token))
240 token->flags |= PREV_WHITE;
242 cpp_output_token (token, print.outf);
244 if (token->type == CPP_STRING || token->type == CPP_WSTRING
245 || token->type == CPP_COMMENT)
246 check_multiline_token (&token->val.str);
249 while (cpp_pop_buffer (pfile) != 0);
252 /* Adjust print.lineno for newlines embedded in tokens. */
254 check_multiline_token (str)
259 for (i = 0; i < str->len; i++)
260 if (str->text[i] == '\n')
264 /* Initialize a cpp_printer structure. As a side effect, open the
270 print.last_fname = 0;
274 if (options->out_fname == NULL)
275 options->out_fname = "";
277 if (options->out_fname[0] == '\0')
281 print.outf = fopen (options->out_fname, "w");
284 cpp_notice_from_errno (pfile, options->out_fname);
292 /* Newline-terminate any output line currently in progress. If
293 appropriate, write the current line number to the output, or pad
294 with newlines so the output line matches the current line. */
296 maybe_print_line (line)
299 /* End the previous line of text (probably only needed until we get
300 multi-line tokens fixed). */
303 putc ('\n', print.outf);
308 if (options->no_line_commands)
314 /* print.lineno is zero if this is the first token of the file. We
315 handle this specially, so that a first line of "# 1 "foo.c" in
316 file foo.i outputs just the foo.c line, and not a foo.i line. */
317 if (line >= print.lineno && line < print.lineno + 8 && print.lineno)
319 while (line > print.lineno)
321 putc ('\n', print.outf);
333 print_line (special_flags)
334 const char *special_flags;
336 /* End any previous line of text. */
338 putc ('\n', print.outf);
341 fprintf (print.outf, "# %u \"%s\"%s%s\n",
342 print.lineno, print.last_fname, special_flags, print.syshdr_flags);
348 cb_ident (pfile, str)
349 cpp_reader *pfile ATTRIBUTE_UNUSED;
350 const cpp_string * str;
352 maybe_print_line (cpp_get_line (pfile)->output_line);
353 fprintf (print.outf, "#ident \"%.*s\"\n", (int) str->len, str->text);
358 cb_define (pfile, node)
362 maybe_print_line (cpp_get_line (pfile)->output_line);
363 fprintf (print.outf, "#define %s", node->name);
365 /* -dD command line option. */
366 if (options->dump_macros == dump_definitions)
367 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
369 putc ('\n', print.outf);
374 cb_undef (pfile, node)
378 maybe_print_line (cpp_get_line (pfile)->output_line);
379 fprintf (print.outf, "#undef %s\n", node->name);
384 cb_include (pfile, dir, header)
385 cpp_reader *pfile ATTRIBUTE_UNUSED;
386 const unsigned char *dir;
387 const cpp_token *header;
389 maybe_print_line (cpp_get_line (pfile)->output_line);
390 fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
395 cb_file_change (pfile, fc)
396 cpp_reader *pfile ATTRIBUTE_UNUSED;
397 const cpp_file_change *fc;
399 /* Bring current file to correct line (except first file). */
400 if (fc->reason == FC_ENTER && fc->from.filename)
401 maybe_print_line (fc->from.lineno);
403 print.last_fname = fc->to.filename;
405 print.syshdr_flags = " 3 4";
407 print.syshdr_flags = " 3";
409 print.syshdr_flags = "";
413 const char *flags = "";
415 print.lineno = fc->to.lineno;
416 if (fc->reason == FC_ENTER)
418 else if (fc->reason == FC_LEAVE)
421 if (! options->no_line_commands)
427 cb_def_pragma (pfile)
430 maybe_print_line (cpp_get_line (pfile)->output_line);
431 fputs ("#pragma ", print.outf);
432 cpp_output_line (pfile, print.outf);
436 /* Dump out the hash table. */
438 dump_macro (pfile, node, v)
441 void *v ATTRIBUTE_UNUSED;
443 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
445 fprintf (print.outf, "#define %s", node->name);
446 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
447 putc ('\n', print.outf);