1 /* CPP main program, using CPP Library.
2 Copyright (C) 1995, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
3 Written by Per Bothner, 1994-95.
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option) any
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 In other words, you are welcome to use, share and improve this program.
20 You are forbidden to forbid anyone else to use, share and improve
21 what you give them. Help stamp out software-hoarding! */
28 /* Encapsulates state used to convert the stream of tokens coming from
29 cpp_get_token back into a text file. */
32 FILE *outf; /* stream to write to. */
33 const char *last_fname; /* previous file name. */
34 const char *syshdr_flags; /* system header flags, if any. */
35 unsigned int lineno; /* line currently being written. */
36 unsigned char printed; /* nonzero if something output at lineno. */
37 unsigned char no_line_dirs; /* nonzero to output no line directives. */
40 int main PARAMS ((int, char **));
41 static void general_init PARAMS ((const char *));
42 static void setup_callbacks PARAMS ((void));
44 /* General output routines. */
45 static void scan_buffer PARAMS ((cpp_reader *));
46 static int printer_init PARAMS ((cpp_reader *));
47 static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
49 static void print_line PARAMS ((const char *));
50 static void maybe_print_line PARAMS ((unsigned int));
52 /* Callback routines for the parser. Most of these are active only
54 static void cb_define PARAMS ((cpp_reader *, cpp_hashnode *));
55 static void cb_undef PARAMS ((cpp_reader *, cpp_hashnode *));
56 static void cb_include PARAMS ((cpp_reader *, const unsigned char *,
58 static void cb_ident PARAMS ((cpp_reader *, const cpp_string *));
59 static void cb_change_file PARAMS ((cpp_reader *, const cpp_file_change *));
60 static void cb_def_pragma PARAMS ((cpp_reader *));
61 static void do_pragma_implementation PARAMS ((cpp_reader *));
63 const char *progname; /* Needs to be global. */
64 static cpp_reader *pfile;
65 static struct printer print;
72 int argi = 1; /* Next argument to handle. */
74 general_init (argv[0]);
75 /* Default language is GNU C89. */
76 pfile = cpp_create_reader (CLK_GNUC89);
78 argi += cpp_handle_options (pfile, argc - argi , argv + argi);
79 if (argi < argc && ! CPP_FATAL_ERRORS (pfile))
80 cpp_fatal (pfile, "Invalid option %s", argv[argi]);
81 if (CPP_FATAL_ERRORS (pfile))
82 return (FATAL_EXIT_CODE);
84 /* Open the output now. We must do so even if no_output is on,
85 because there may be other output than from the actual
86 preprocessing (e.g. from -dM). */
87 if (printer_init (pfile))
88 return (FATAL_EXIT_CODE);
92 if (! cpp_start_read (pfile, CPP_OPTION (pfile, in_fname)))
93 return (FATAL_EXIT_CODE);
95 if (CPP_BUFFER (pfile))
97 if (CPP_OPTION (pfile, no_output))
98 cpp_scan_buffer_nooutput (pfile, 1);
103 /* -dM command line option. */
104 if (CPP_OPTION (pfile, dump_macros) == dump_only)
105 cpp_forall_identifiers (pfile, dump_macro, NULL);
110 /* Flush any pending output. */
112 putc ('\n', print.outf);
113 if (ferror (print.outf) || fclose (print.outf))
114 cpp_notice_from_errno (pfile, CPP_OPTION (pfile, out_fname));
117 return (FATAL_EXIT_CODE);
118 return (SUCCESS_EXIT_CODE);
121 /* Store the program name, and set the locale. */
123 general_init (const char *argv0)
125 progname = argv0 + strlen (argv0);
127 while (progname != argv0 && ! IS_DIR_SEPARATOR (progname[-1]))
130 xmalloc_set_program_name (progname);
132 #ifdef HAVE_LC_MESSAGES
133 setlocale (LC_MESSAGES, "");
135 (void) bindtextdomain (PACKAGE, localedir);
136 (void) textdomain (PACKAGE);
139 /* Set up the callbacks and register the pragmas we handle. */
144 if (! CPP_OPTION (pfile, no_output))
146 pfile->cb.ident = cb_ident;
147 pfile->cb.def_pragma = cb_def_pragma;
148 if (! CPP_OPTION (pfile, no_line_commands))
149 pfile->cb.change_file = cb_change_file;
152 if (CPP_OPTION (pfile, dump_includes))
153 pfile->cb.include = cb_include;
155 if (CPP_OPTION (pfile, debug_output)
156 || CPP_OPTION (pfile, dump_macros) == dump_names
157 || CPP_OPTION (pfile, dump_macros) == dump_definitions)
159 pfile->cb.define = cb_define;
160 pfile->cb.undef = cb_undef;
161 pfile->cb.poison = cb_def_pragma;
164 /* Register one #pragma which needs special handling. */
165 cpp_register_pragma(pfile, 0, "implementation", do_pragma_implementation);
166 cpp_register_pragma(pfile, "GCC", "implementation", do_pragma_implementation);
169 /* Writes out the preprocessed file. Alternates between two tokens,
170 so that we can avoid accidental token pasting. */
175 unsigned int index, line;
176 cpp_token tokens[2], *token;
180 for (index = 0;; index = 1 - index)
182 token = &tokens[index];
183 cpp_get_token (pfile, token);
185 if (token->type == CPP_EOF)
188 line = cpp_get_line (pfile)->output_line;
189 if (print.lineno != line)
191 unsigned int col = cpp_get_line (pfile)->col;
193 /* Supply enough whitespace to put this token in its original
194 column. Don't bother trying to reconstruct tabs; we can't
195 get it right in general, and nothing ought to care. (Yes,
196 some things do care; the fault lies with them.) */
197 maybe_print_line (line);
200 if (token->flags & PREV_WHITE)
203 putc (' ', print.outf);
206 else if (print.printed
207 && ! (token->flags & PREV_WHITE)
208 && CPP_OPTION (pfile, lang) != CLK_ASM
209 && cpp_avoid_paste (pfile, &tokens[1 - index], token))
210 token->flags |= PREV_WHITE;
212 cpp_output_token (token, print.outf);
216 while (cpp_pop_buffer (pfile) != 0);
219 /* Initialize a cpp_printer structure. As a side effect, open the
225 print.last_fname = 0;
228 print.no_line_dirs = CPP_OPTION (pfile, no_line_commands);
230 if (CPP_OPTION (pfile, out_fname) == NULL)
231 CPP_OPTION (pfile, out_fname) = "";
233 if (CPP_OPTION (pfile, out_fname)[0] == '\0')
237 print.outf = fopen (CPP_OPTION (pfile, out_fname), "w");
240 cpp_notice_from_errno (pfile, CPP_OPTION (pfile, out_fname));
247 /* Newline-terminate any output line currently in progress. If
248 appropriate, write the current line number to the output, or pad
249 with newlines so the output line matches the current line. */
251 maybe_print_line (line)
254 /* End the previous line of text (probably only needed until we get
255 multi-line tokens fixed). */
258 putc ('\n', print.outf);
263 if (print.no_line_dirs)
266 /* print.lineno is zero if this is the first token of the file. We
267 handle this specially, so that a first line of "# 1 "foo.c" in
268 file foo.i outputs just the foo.c line, and not a foo.i line. */
269 if (line >= print.lineno && line < print.lineno + 8 && print.lineno)
271 while (line > print.lineno)
273 putc ('\n', print.outf);
285 print_line (special_flags)
286 const char *special_flags;
288 /* End any previous line of text. */
290 putc ('\n', print.outf);
293 fprintf (print.outf, "# %u \"%s\"%s%s\n",
294 print.lineno, print.last_fname, special_flags, print.syshdr_flags);
300 cb_ident (pfile, str)
301 cpp_reader *pfile ATTRIBUTE_UNUSED;
302 const cpp_string * str;
304 maybe_print_line (cpp_get_line (pfile)->output_line);
305 fprintf (print.outf, "#ident \"%.*s\"\n", (int) str->len, str->text);
310 cb_define (pfile, node)
314 if (pfile->done_initializing)
316 maybe_print_line (cpp_get_line (pfile)->output_line);
317 fprintf (print.outf, "#define %s", node->name);
319 /* -dD or -g3 command line options. */
320 if (CPP_OPTION (pfile, debug_output)
321 || CPP_OPTION (pfile, dump_macros) == dump_definitions)
322 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
324 putc ('\n', print.outf);
330 cb_undef (pfile, node)
334 if (pfile->done_initializing)
336 maybe_print_line (cpp_get_line (pfile)->output_line);
337 fprintf (print.outf, "#undef %s\n", node->name);
343 cb_include (pfile, dir, header)
344 cpp_reader *pfile ATTRIBUTE_UNUSED;
345 const unsigned char *dir;
346 const cpp_token *header;
348 maybe_print_line (cpp_get_line (pfile)->output_line);
349 fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
354 cb_change_file (pfile, fc)
355 cpp_reader *pfile ATTRIBUTE_UNUSED;
356 const cpp_file_change *fc;
360 /* Bring current file to correct line (except first file). */
361 if (fc->reason == FC_ENTER && fc->from.filename)
362 maybe_print_line (fc->from.lineno);
364 print.last_fname = fc->to.filename;
366 print.syshdr_flags = " 3 4";
368 print.syshdr_flags = " 3";
370 print.syshdr_flags = "";
374 print.lineno = fc->to.lineno;
377 case FC_ENTER : flags = " 1"; break;
378 case FC_LEAVE : flags = " 2"; break;
379 case FC_RENAME: flags = ""; break;
387 cb_def_pragma (pfile)
390 maybe_print_line (cpp_get_line (pfile)->output_line);
391 fputs ("#pragma ", print.outf);
392 cpp_output_line (pfile, print.outf);
397 do_pragma_implementation (pfile)
400 /* Be quiet about `#pragma implementation' for a file only if it hasn't
401 been included yet. */
404 cpp_start_lookahead (pfile);
405 cpp_get_token (pfile, &token);
406 cpp_stop_lookahead (pfile, 0);
408 /* If it's not a string, pass it through and let the front end complain. */
409 if (token.type == CPP_STRING)
411 /* Make a NUL-terminated copy of the string. */
412 char *filename = alloca (token.val.str.len + 1);
413 memcpy (filename, token.val.str.text, token.val.str.len);
414 filename[token.val.str.len] = '\0';
415 if (cpp_included (pfile, filename))
417 "#pragma GCC implementation for \"%s\" appears after file is included",
420 else if (token.type != CPP_EOF)
422 cpp_error (pfile, "malformed #pragma GCC implementation");
426 /* Output? This is nasty, but we don't have [GCC] implementation in
428 if (pfile->cb.def_pragma)
430 maybe_print_line (cpp_get_line (pfile)->output_line);
431 fputs ("#pragma GCC implementation ", print.outf);
432 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 fprintf (print.outf, "#define %s", node->name);
447 fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
448 putc ('\n', print.outf);