1 /* Preprocess only, using cpplib.
2 Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
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. */
25 /* Encapsulates state used to convert a stream of tokens into a text
29 FILE *outf; /* Stream to write to. */
30 const struct line_map *map; /* Logical to physical line mappings. */
31 const cpp_token *prev; /* Previous token. */
32 const cpp_token *source; /* Source token for spacing. */
33 fileline line; /* Line currently being written. */
34 unsigned char printed; /* Nonzero if something output at line. */
37 /* General output routines. */
38 static void scan_translation_unit (cpp_reader *);
39 static void scan_translation_unit_trad (cpp_reader *);
40 static void account_for_newlines (const unsigned char *, size_t);
41 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
43 static void print_line (const struct line_map *, fileline, const char *);
44 static void maybe_print_line (const struct line_map *, fileline);
46 /* Callback routines for the parser. Most of these are active only
48 static void cb_line_change (cpp_reader *, const cpp_token *, int);
49 static void cb_define (cpp_reader *, fileline, cpp_hashnode *);
50 static void cb_undef (cpp_reader *, fileline, cpp_hashnode *);
51 static void cb_include (cpp_reader *, fileline, const unsigned char *,
53 static void cb_ident (cpp_reader *, fileline, const cpp_string *);
54 static void cb_def_pragma (cpp_reader *, fileline);
56 /* Preprocess and output. */
58 preprocess_file (cpp_reader *pfile)
60 /* A successful cpp_read_main_file guarantees that we can call
61 cpp_scan_nooutput or cpp_get_token next. */
64 /* Scan -included buffers, then the main file. */
65 while (pfile->buffer->prev)
66 cpp_scan_nooutput (pfile);
67 cpp_scan_nooutput (pfile);
69 else if (cpp_get_options (pfile)->traditional)
70 scan_translation_unit_trad (pfile);
72 scan_translation_unit (pfile);
74 /* -dM command line option. Should this be elsewhere? */
75 if (flag_dump_macros == 'M')
76 cpp_forall_identifiers (pfile, dump_macro, NULL);
78 /* Flush any pending output. */
80 putc ('\n', print.outf);
83 /* Set up the callbacks as appropriate. */
85 init_pp_output (FILE *out_stream)
87 cpp_callbacks *cb = cpp_get_callbacks (parse_in);
91 cb->line_change = cb_line_change;
92 /* Don't emit #pragma or #ident directives if we are processing
93 assembly language; the assembler may choke on them. */
94 if (cpp_get_options (parse_in)->lang != CLK_ASM)
97 cb->def_pragma = cb_def_pragma;
101 if (flag_dump_includes)
102 cb->include = cb_include;
104 if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
106 cb->define = cb_define;
107 cb->undef = cb_undef;
110 /* Initialize the print structure. Setting print.line to -1 here is
111 a trick to guarantee that the first token of the file will cause
112 a linemarker to be output by maybe_print_line. */
113 print.line = (fileline) -1;
117 print.outf = out_stream;
120 /* Writes out the preprocessed file, handling spacing and paste
123 scan_translation_unit (cpp_reader *pfile)
125 bool avoid_paste = false;
130 const cpp_token *token = cpp_get_token (pfile);
132 if (token->type == CPP_PADDING)
135 if (print.source == NULL
136 || (!(print.source->flags & PREV_WHITE)
137 && token->val.source == NULL))
138 print.source = token->val.source;
142 if (token->type == CPP_EOF)
145 /* Subtle logic to output a space if and only if necessary. */
148 if (print.source == NULL)
149 print.source = token;
150 if (print.source->flags & PREV_WHITE
152 && cpp_avoid_paste (pfile, print.prev, token))
153 || (print.prev == NULL && token->type == CPP_HASH))
154 putc (' ', print.outf);
156 else if (token->flags & PREV_WHITE)
157 putc (' ', print.outf);
162 cpp_output_token (token, print.outf);
164 if (token->type == CPP_COMMENT)
165 account_for_newlines (token->val.str.text, token->val.str.len);
169 /* Adjust print.line for newlines embedded in output. */
171 account_for_newlines (const unsigned char *str, size_t len)
178 /* Writes out a traditionally preprocessed file. */
180 scan_translation_unit_trad (cpp_reader *pfile)
182 while (_cpp_read_logical_line_trad (pfile))
184 size_t len = pfile->out.cur - pfile->out.base;
185 maybe_print_line (print.map, pfile->out.first_line);
186 fwrite (pfile->out.base, 1, len, print.outf);
188 if (!CPP_OPTION (pfile, discard_comments))
189 account_for_newlines (pfile->out.base, len);
193 /* If the token read on logical line LINE needs to be output on a
194 different line to the current one, output the required newlines or
195 a line marker, and return 1. Otherwise return 0. */
197 maybe_print_line (const struct line_map *map, fileline line)
199 /* End the previous line of text. */
202 putc ('\n', print.outf);
207 if (line >= print.line && line < print.line + 8)
209 while (line > print.line)
211 putc ('\n', print.outf);
216 print_line (map, line, "");
219 /* Output a line marker for logical line LINE. Special flags are "1"
220 or "2" indicating entering or leaving a file. */
222 print_line (const struct line_map *map, fileline line, const char *special_flags)
224 /* End any previous line of text. */
226 putc ('\n', print.outf);
230 if (!flag_no_line_commands)
232 size_t to_file_len = strlen (map->to_file);
233 unsigned char *to_file_quoted = alloca (to_file_len * 4 + 1);
236 /* cpp_quote_string does not nul-terminate, so we have to do it
238 p = cpp_quote_string (to_file_quoted,
239 (unsigned char *)map->to_file, to_file_len);
241 fprintf (print.outf, "# %u \"%s\"%s",
242 SOURCE_LINE (map, print.line),
243 to_file_quoted, special_flags);
246 fputs (" 3 4", print.outf);
247 else if (map->sysp == 1)
248 fputs (" 3", print.outf);
250 putc ('\n', print.outf);
254 /* Called when a line of output is started. TOKEN is the first token
255 of the line, and at end of file will be CPP_EOF. */
257 cb_line_change (cpp_reader *pfile, const cpp_token *token,
260 if (token->type == CPP_EOF || parsing_args)
263 maybe_print_line (print.map, token->line);
267 /* Supply enough spaces to put this token in its original column,
268 one space per column greater than 2, since scan_translation_unit
269 will provide a space if PREV_WHITE. Don't bother trying to
270 reconstruct tabs; we can't get it right in general, and nothing
271 ought to care. Some things do care; the fault lies with them. */
272 if (!CPP_OPTION (pfile, traditional))
277 unsigned int spaces = token->col - 2;
280 putc (' ', print.outf);
286 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, fileline line,
287 const cpp_string *str)
289 maybe_print_line (print.map, line);
290 fprintf (print.outf, "#ident %s\n", str->text);
295 cb_define (cpp_reader *pfile, fileline line, cpp_hashnode *node)
297 maybe_print_line (print.map, line);
298 fputs ("#define ", print.outf);
300 /* 'D' is whole definition; 'N' is name only. */
301 if (flag_dump_macros == 'D')
302 fputs ((const char *) cpp_macro_definition (pfile, node),
305 fputs ((const char *) NODE_NAME (node), print.outf);
307 putc ('\n', print.outf);
312 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, fileline line,
315 maybe_print_line (print.map, line);
316 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
321 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, fileline line,
322 const unsigned char *dir, const char *header, int angle_brackets)
324 maybe_print_line (print.map, line);
326 fprintf (print.outf, "#%s <%s>\n", dir, header);
328 fprintf (print.outf, "#%s \"%s\"\n", dir, header);
332 /* Callback called when -fworking-director and -E to emit working
333 diretory in cpp output file. */
336 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
338 size_t to_file_len = strlen (dir);
339 unsigned char *to_file_quoted = alloca (to_file_len * 4 + 1);
342 /* cpp_quote_string does not nul-terminate, so we have to do it ourselves. */
343 p = cpp_quote_string (to_file_quoted, (unsigned char *) dir, to_file_len);
345 fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
348 /* The file name, line number or system header flags have changed, as
349 described in MAP. From this point on, the old print.map might be
350 pointing to freed memory, and so must not be dereferenced. */
353 pp_file_change (const struct line_map *map)
355 const char *flags = "";
357 if (flag_no_line_commands)
363 if (print.map == NULL)
365 /* Avoid printing foo.i when the main file is foo.c. */
366 if (!cpp_get_options (parse_in)->preprocessed)
367 print_line (map, map->from_line, flags);
371 /* Bring current file to correct line when entering a new file. */
372 if (map->reason == LC_ENTER)
373 maybe_print_line (map - 1, map->from_line - 1);
375 if (map->reason == LC_ENTER)
377 else if (map->reason == LC_LEAVE)
379 print_line (map, map->from_line, flags);
386 /* Copy a #pragma directive to the preprocessed output. */
388 cb_def_pragma (cpp_reader *pfile, fileline line)
390 maybe_print_line (print.map, line);
391 fputs ("#pragma ", print.outf);
392 cpp_output_line (pfile, print.outf);
396 /* Dump out the hash table. */
398 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
400 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
402 fputs ("#define ", print.outf);
403 fputs ((const char *) cpp_macro_definition (pfile, node),
405 putc ('\n', print.outf);