1 /* Preprocess only, using cpplib.
2 Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003
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. */
22 #include "coretypes.h"
27 #include "c-common.h" /* For flags. */
28 #include "c-pragma.h" /* For parse_in. */
30 /* Encapsulates state used to convert a stream of tokens into a text
34 FILE *outf; /* Stream to write to. */
35 const struct line_map *map; /* Logical to physical line mappings. */
36 const cpp_token *prev; /* Previous token. */
37 const cpp_token *source; /* Source token for spacing. */
38 unsigned int line; /* Line currently being written. */
39 unsigned char printed; /* Nonzero if something output at line. */
42 /* General output routines. */
43 static void scan_translation_unit PARAMS ((cpp_reader *));
44 static void scan_translation_unit_trad PARAMS ((cpp_reader *));
45 static void account_for_newlines PARAMS ((const uchar *, size_t));
46 static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
48 static void print_line PARAMS ((const struct line_map *, unsigned int,
50 static void maybe_print_line PARAMS ((const struct line_map *, unsigned int));
52 /* Callback routines for the parser. Most of these are active only
54 static void cb_line_change PARAMS ((cpp_reader *, const cpp_token *, int));
55 static void cb_define PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
56 static void cb_undef PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
57 static void cb_include PARAMS ((cpp_reader *, unsigned int,
58 const unsigned char *, const cpp_token *));
59 static void cb_ident PARAMS ((cpp_reader *, unsigned int,
61 static void cb_def_pragma PARAMS ((cpp_reader *, unsigned int));
63 /* Preprocess and output. */
65 preprocess_file (pfile)
68 /* A successful cpp_read_main_file guarantees that we can call
69 cpp_scan_nooutput or cpp_get_token next. */
72 /* Scan -included buffers, then the main file. */
73 while (pfile->buffer->prev)
74 cpp_scan_nooutput (pfile);
75 cpp_scan_nooutput (pfile);
77 else if (cpp_get_options (pfile)->traditional)
78 scan_translation_unit_trad (pfile);
80 scan_translation_unit (pfile);
82 /* -dM command line option. Should this be elsewhere? */
83 if (flag_dump_macros == 'M')
84 cpp_forall_identifiers (pfile, dump_macro, NULL);
86 /* Flush any pending output. */
88 putc ('\n', print.outf);
91 /* Set up the callbacks as appropriate. */
93 init_pp_output (out_stream)
96 cpp_callbacks *cb = cpp_get_callbacks (parse_in);
98 cb->register_builtins = cb_register_builtins;
102 cb->line_change = cb_line_change;
103 /* Don't emit #pragma or #ident directives if we are processing
104 assembly language; the assembler may choke on them. */
105 if (cpp_get_options (parse_in)->lang != CLK_ASM)
107 cb->ident = cb_ident;
108 cb->def_pragma = cb_def_pragma;
112 if (flag_dump_includes)
113 cb->include = cb_include;
115 if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
117 cb->define = cb_define;
118 cb->undef = cb_undef;
121 /* Initialize the print structure. Setting print.line to -1 here is
122 a trick to guarantee that the first token of the file will cause
123 a linemarker to be output by maybe_print_line. */
124 print.line = (unsigned int) -1;
128 print.outf = out_stream;
131 /* Writes out the preprocessed file, handling spacing and paste
134 scan_translation_unit (pfile)
137 bool avoid_paste = false;
142 const cpp_token *token = cpp_get_token (pfile);
144 if (token->type == CPP_PADDING)
147 if (print.source == NULL
148 || (!(print.source->flags & PREV_WHITE)
149 && token->val.source == NULL))
150 print.source = token->val.source;
154 if (token->type == CPP_EOF)
157 /* Subtle logic to output a space if and only if necessary. */
160 if (print.source == NULL)
161 print.source = token;
162 if (print.source->flags & PREV_WHITE
164 && cpp_avoid_paste (pfile, print.prev, token))
165 || (print.prev == NULL && token->type == CPP_HASH))
166 putc (' ', print.outf);
168 else if (token->flags & PREV_WHITE)
169 putc (' ', print.outf);
174 cpp_output_token (token, print.outf);
176 if (token->type == CPP_COMMENT)
177 account_for_newlines (token->val.str.text, token->val.str.len);
181 /* Adjust print.line for newlines embedded in output. */
183 account_for_newlines (str, len)
192 /* Writes out a traditionally preprocessed file. */
194 scan_translation_unit_trad (pfile)
197 while (_cpp_read_logical_line_trad (pfile))
199 size_t len = pfile->out.cur - pfile->out.base;
200 maybe_print_line (print.map, pfile->out.first_line);
201 fwrite (pfile->out.base, 1, len, print.outf);
203 if (!CPP_OPTION (pfile, discard_comments))
204 account_for_newlines (pfile->out.base, len);
208 /* If the token read on logical line LINE needs to be output on a
209 different line to the current one, output the required newlines or
210 a line marker, and return 1. Otherwise return 0. */
212 maybe_print_line (map, line)
213 const struct line_map *map;
216 /* End the previous line of text. */
219 putc ('\n', print.outf);
224 if (line >= print.line && line < print.line + 8)
226 while (line > print.line)
228 putc ('\n', print.outf);
233 print_line (map, line, "");
236 /* Output a line marker for logical line LINE. Special flags are "1"
237 or "2" indicating entering or leaving a file. */
239 print_line (map, line, special_flags)
240 const struct line_map *map;
242 const char *special_flags;
244 /* End any previous line of text. */
246 putc ('\n', print.outf);
250 if (!flag_no_line_commands)
252 size_t to_file_len = strlen (map->to_file);
253 unsigned char *to_file_quoted = alloca (to_file_len * 4 + 1);
256 /* cpp_quote_string does not nul-terminate, so we have to do it
258 p = cpp_quote_string (to_file_quoted,
259 (unsigned char *)map->to_file, to_file_len);
261 fprintf (print.outf, "# %u \"%s\"%s",
262 SOURCE_LINE (map, print.line),
263 to_file_quoted, special_flags);
266 fputs (" 3 4", print.outf);
267 else if (map->sysp == 1)
268 fputs (" 3", print.outf);
270 putc ('\n', print.outf);
274 /* Called when a line of output is started. TOKEN is the first token
275 of the line, and at end of file will be CPP_EOF. */
277 cb_line_change (pfile, token, parsing_args)
279 const cpp_token *token;
282 if (token->type == CPP_EOF || parsing_args)
285 maybe_print_line (print.map, token->line);
289 /* Supply enough spaces to put this token in its original column,
290 one space per column greater than 2, since scan_translation_unit
291 will provide a space if PREV_WHITE. Don't bother trying to
292 reconstruct tabs; we can't get it right in general, and nothing
293 ought to care. Some things do care; the fault lies with them. */
294 if (!CPP_OPTION (pfile, traditional))
299 unsigned int spaces = token->col - 2;
302 putc (' ', print.outf);
308 cb_ident (pfile, line, str)
309 cpp_reader *pfile ATTRIBUTE_UNUSED;
311 const cpp_string * str;
313 maybe_print_line (print.map, line);
314 fprintf (print.outf, "#ident \"%s\"\n", str->text);
319 cb_define (pfile, line, node)
324 maybe_print_line (print.map, line);
325 fputs ("#define ", print.outf);
327 /* 'D' is whole definition; 'N' is name only. */
328 if (flag_dump_macros == 'D')
329 fputs ((const char *) cpp_macro_definition (pfile, node),
332 fputs ((const char *) NODE_NAME (node), print.outf);
334 putc ('\n', print.outf);
339 cb_undef (pfile, line, node)
340 cpp_reader *pfile ATTRIBUTE_UNUSED;
344 maybe_print_line (print.map, line);
345 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
350 cb_include (pfile, line, dir, header)
353 const unsigned char *dir;
354 const cpp_token *header;
356 maybe_print_line (print.map, line);
357 fprintf (print.outf, "#%s %s\n", dir,
358 cpp_token_as_text (pfile, header));
362 /* The file name, line number or system header flags have changed, as
363 described in MAP. From this point on, the old print.map might be
364 pointing to freed memory, and so must not be dereferenced. */
368 const struct line_map *map;
370 const char *flags = "";
372 if (flag_no_line_commands || flag_no_output)
376 if (print.map == NULL)
378 /* Avoid printing foo.i when the main file is foo.c. */
379 if (!cpp_get_options (parse_in)->preprocessed)
380 print_line (map, map->from_line, flags);
384 /* Bring current file to correct line when entering a new file. */
385 if (map->reason == LC_ENTER)
386 maybe_print_line (map - 1, map->from_line - 1);
388 if (map->reason == LC_ENTER)
390 else if (map->reason == LC_LEAVE)
392 print_line (map, map->from_line, flags);
398 /* Copy a #pragma directive to the preprocessed output. */
400 cb_def_pragma (pfile, line)
404 maybe_print_line (print.map, line);
405 fputs ("#pragma ", print.outf);
406 cpp_output_line (pfile, print.outf);
410 /* Dump out the hash table. */
412 dump_macro (pfile, node, v)
415 void *v ATTRIBUTE_UNUSED;
417 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
419 fputs ("#define ", print.outf);
420 fputs ((const char *) cpp_macro_definition (pfile, node),
422 putc ('\n', print.outf);