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 (NULL, 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;
241 /* Special case '# <directive name>': insert a space between
242 the # and the token. This will prevent it from being
243 treated as a directive when this code is re-preprocessed.
244 XXX Should do this only at the beginning of a line, but how? */
245 else if (token->type == CPP_NAME && token->val.node->directive_index
246 && tokens[1 - index].type == CPP_HASH)
247 token->flags |= PREV_WHITE;
249 cpp_output_token (token, print.outf);
251 if (token->type == CPP_STRING || token->type == CPP_WSTRING
252 || token->type == CPP_COMMENT)
253 check_multiline_token (&token->val.str);
256 while (cpp_pop_buffer (pfile) != 0);
259 /* Adjust print.lineno for newlines embedded in tokens. */
261 check_multiline_token (str)
266 for (i = 0; i < str->len; i++)
267 if (str->text[i] == '\n')
271 /* Initialize a cpp_printer structure. As a side effect, open the
277 print.last_fname = 0;
281 if (options->out_fname[0] == '\0')
285 print.outf = fopen (options->out_fname, "w");
288 cpp_notice_from_errno (pfile, options->out_fname);
296 /* Newline-terminate any output line currently in progress. If
297 appropriate, write the current line number to the output, or pad
298 with newlines so the output line matches the current line. */
300 maybe_print_line (line)
303 /* End the previous line of text (probably only needed until we get
304 multi-line tokens fixed). */
307 putc ('\n', print.outf);
312 if (options->no_line_commands)
318 /* print.lineno is zero if this is the first token of the file. We
319 handle this specially, so that a first line of "# 1 "foo.c" in
320 file foo.i outputs just the foo.c line, and not a foo.i line. */
321 if (line >= print.lineno && line < print.lineno + 8 && print.lineno)
323 while (line > print.lineno)
325 putc ('\n', print.outf);
337 print_line (special_flags)
338 const char *special_flags;
340 /* End any previous line of text. */
342 putc ('\n', print.outf);
345 /* SDCC likes #line, not # number. Should be fixed... */
347 fprintf (print.outf, "# %u \"%s\"%s%s\n",
348 print.lineno, print.last_fname, special_flags, print.syshdr_flags);
350 fprintf (print.outf, "#line %u \"%s\"%s%s\n",
351 print.lineno, print.last_fname, special_flags, print.syshdr_flags);
358 cb_ident (pfile, str)
359 cpp_reader *pfile ATTRIBUTE_UNUSED;
360 const cpp_string * str;
362 maybe_print_line (cpp_get_line (pfile)->output_line);
363 fprintf (print.outf, "#ident \"%s\"\n", str->text);
368 cb_define (pfile, node)
372 maybe_print_line (cpp_get_line (pfile)->output_line);
373 fputs ("#define ", print.outf);
375 /* -dD command line option. */
376 if (options->dump_macros == dump_definitions)
377 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
379 fputs ((const char *) NODE_NAME (node), print.outf);
381 putc ('\n', print.outf);
386 cb_undef (pfile, node)
390 maybe_print_line (cpp_get_line (pfile)->output_line);
391 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
396 cb_include (pfile, dir, header)
397 cpp_reader *pfile ATTRIBUTE_UNUSED;
398 const unsigned char *dir;
399 const cpp_token *header;
401 maybe_print_line (cpp_get_line (pfile)->output_line);
402 fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
407 cb_file_change (pfile, fc)
408 cpp_reader *pfile ATTRIBUTE_UNUSED;
409 const cpp_file_change *fc;
411 /* Bring current file to correct line (except first file). */
412 if (fc->reason == FC_ENTER && fc->from.filename)
413 maybe_print_line (fc->from.lineno);
415 print.last_fname = fc->to.filename;
417 print.syshdr_flags = " 3 4";
419 print.syshdr_flags = " 3";
421 print.syshdr_flags = "";
425 const char *flags = "";
427 print.lineno = fc->to.lineno;
428 if (fc->reason == FC_ENTER)
430 else if (fc->reason == FC_LEAVE)
433 if (! options->no_line_commands)
439 cb_def_pragma (pfile)
442 maybe_print_line (cpp_get_line (pfile)->output_line);
443 fputs ("#pragma ", print.outf);
444 cpp_output_line (pfile, print.outf);
448 /* Dump out the hash table. */
450 dump_macro (pfile, node, v)
453 void *v ATTRIBUTE_UNUSED;
455 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
457 fputs ("#define ", print.outf);
458 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
459 putc ('\n', print.outf);