1 /* Preprocess only, using cpplib.
2 Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007,
3 2008 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 3, 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; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
25 #include "../libcpp/internal.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 cpp_token *prev; /* Previous token. */
36 const cpp_token *source; /* Source token for spacing. */
37 int src_line; /* Line number currently being written. */
38 unsigned char printed; /* Nonzero if something output at line. */
39 bool first_time; /* pp_file_change hasn't been called yet. */
42 /* Defined and undefined macros being queued for output with -dU at
44 typedef struct macro_queue
46 struct macro_queue *next; /* Next macro in the list. */
47 char *macro; /* The name of the macro if not
48 defined, the full definition if
51 static macro_queue *define_queue, *undef_queue;
53 /* General output routines. */
54 static void scan_translation_unit (cpp_reader *);
55 static void print_lines_directives_only (int, const void *, size_t);
56 static void scan_translation_unit_directives_only (cpp_reader *);
57 static void scan_translation_unit_trad (cpp_reader *);
58 static void account_for_newlines (const unsigned char *, size_t);
59 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
60 static void dump_queued_macros (cpp_reader *);
62 static void print_line (source_location, const char *);
63 static void maybe_print_line (source_location);
65 /* Callback routines for the parser. Most of these are active only
67 static void cb_line_change (cpp_reader *, const cpp_token *, int);
68 static void cb_define (cpp_reader *, source_location, cpp_hashnode *);
69 static void cb_undef (cpp_reader *, source_location, cpp_hashnode *);
70 static void cb_used_define (cpp_reader *, source_location, cpp_hashnode *);
71 static void cb_used_undef (cpp_reader *, source_location, cpp_hashnode *);
72 static void cb_include (cpp_reader *, source_location, const unsigned char *,
73 const char *, int, const cpp_token **);
74 static void cb_ident (cpp_reader *, source_location, const cpp_string *);
75 static void cb_def_pragma (cpp_reader *, source_location);
76 static void cb_read_pch (cpp_reader *pfile, const char *name,
77 int fd, const char *orig_name);
79 /* Preprocess and output. */
81 preprocess_file (cpp_reader *pfile)
83 /* A successful cpp_read_main_file guarantees that we can call
84 cpp_scan_nooutput or cpp_get_token next. */
87 /* Scan -included buffers, then the main file. */
88 while (pfile->buffer->prev)
89 cpp_scan_nooutput (pfile);
90 cpp_scan_nooutput (pfile);
92 else if (cpp_get_options (pfile)->traditional)
93 scan_translation_unit_trad (pfile);
94 else if (cpp_get_options (pfile)->directives_only
95 && !cpp_get_options (pfile)->preprocessed)
96 scan_translation_unit_directives_only (pfile);
98 scan_translation_unit (pfile);
100 /* -dM command line option. Should this be elsewhere? */
101 if (flag_dump_macros == 'M')
102 cpp_forall_identifiers (pfile, dump_macro, NULL);
104 /* Flush any pending output. */
106 putc ('\n', print.outf);
109 /* Set up the callbacks as appropriate. */
111 init_pp_output (FILE *out_stream)
113 cpp_callbacks *cb = cpp_get_callbacks (parse_in);
117 cb->line_change = cb_line_change;
118 /* Don't emit #pragma or #ident directives if we are processing
119 assembly language; the assembler may choke on them. */
120 if (cpp_get_options (parse_in)->lang != CLK_ASM)
122 cb->ident = cb_ident;
123 cb->def_pragma = cb_def_pragma;
127 if (flag_dump_includes)
128 cb->include = cb_include;
130 if (flag_pch_preprocess)
132 cb->valid_pch = c_common_valid_pch;
133 cb->read_pch = cb_read_pch;
136 if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
138 cb->define = cb_define;
139 cb->undef = cb_undef;
142 if (flag_dump_macros == 'U')
144 cb->before_define = dump_queued_macros;
145 cb->used_define = cb_used_define;
146 cb->used_undef = cb_used_undef;
149 /* Initialize the print structure. */
153 print.outf = out_stream;
154 print.first_time = 1;
157 /* Writes out the preprocessed file, handling spacing and paste
160 scan_translation_unit (cpp_reader *pfile)
162 bool avoid_paste = false;
167 const cpp_token *token = cpp_get_token (pfile);
169 if (token->type == CPP_PADDING)
172 if (print.source == NULL
173 || (!(print.source->flags & PREV_WHITE)
174 && token->val.source == NULL))
175 print.source = token->val.source;
179 if (token->type == CPP_EOF)
182 /* Subtle logic to output a space if and only if necessary. */
185 if (print.source == NULL)
186 print.source = token;
187 if (print.source->flags & PREV_WHITE
189 && cpp_avoid_paste (pfile, print.prev, token))
190 || (print.prev == NULL && token->type == CPP_HASH))
191 putc (' ', print.outf);
193 else if (token->flags & PREV_WHITE)
194 putc (' ', print.outf);
199 if (token->type == CPP_PRAGMA)
204 maybe_print_line (token->src_loc);
205 fputs ("#pragma ", print.outf);
206 c_pp_lookup_pragma (token->val.pragma, &space, &name);
208 fprintf (print.outf, "%s %s", space, name);
210 fprintf (print.outf, "%s", name);
213 else if (token->type == CPP_PRAGMA_EOL)
214 maybe_print_line (token->src_loc);
216 cpp_output_token (token, print.outf);
218 if (token->type == CPP_COMMENT)
219 account_for_newlines (token->val.str.text, token->val.str.len);
224 print_lines_directives_only (int lines, const void *buf, size_t size)
226 print.src_line += lines;
227 fwrite (buf, 1, size, print.outf);
230 /* Writes out the preprocessed file, handling spacing and paste
233 scan_translation_unit_directives_only (cpp_reader *pfile)
235 struct _cpp_dir_only_callbacks cb;
237 cb.print_lines = print_lines_directives_only;
238 cb.maybe_print_line = maybe_print_line;
240 _cpp_preprocess_dir_only (pfile, &cb);
243 /* Adjust print.src_line for newlines embedded in output. */
245 account_for_newlines (const unsigned char *str, size_t len)
252 /* Writes out a traditionally preprocessed file. */
254 scan_translation_unit_trad (cpp_reader *pfile)
256 while (_cpp_read_logical_line_trad (pfile))
258 size_t len = pfile->out.cur - pfile->out.base;
259 maybe_print_line (pfile->out.first_line);
260 fwrite (pfile->out.base, 1, len, print.outf);
262 if (!CPP_OPTION (pfile, discard_comments))
263 account_for_newlines (pfile->out.base, len);
267 /* If the token read on logical line LINE needs to be output on a
268 different line to the current one, output the required newlines or
269 a line marker, and return 1. Otherwise return 0. */
271 maybe_print_line (source_location src_loc)
273 const struct line_map *map = linemap_lookup (line_table, src_loc);
274 int src_line = SOURCE_LINE (map, src_loc);
275 /* End the previous line of text. */
278 putc ('\n', print.outf);
283 if (src_line >= print.src_line && src_line < print.src_line + 8)
285 while (src_line > print.src_line)
287 putc ('\n', print.outf);
292 print_line (src_loc, "");
295 /* Output a line marker for logical line LINE. Special flags are "1"
296 or "2" indicating entering or leaving a file. */
298 print_line (source_location src_loc, const char *special_flags)
300 /* End any previous line of text. */
302 putc ('\n', print.outf);
305 if (!flag_no_line_commands)
307 const struct line_map *map = linemap_lookup (line_table, src_loc);
309 size_t to_file_len = strlen (map->to_file);
310 unsigned char *to_file_quoted =
311 (unsigned char *) alloca (to_file_len * 4 + 1);
314 print.src_line = SOURCE_LINE (map, src_loc);
316 /* cpp_quote_string does not nul-terminate, so we have to do it
318 p = cpp_quote_string (to_file_quoted,
319 (const unsigned char *) map->to_file, to_file_len);
321 fprintf (print.outf, "# %u \"%s\"%s",
322 print.src_line == 0 ? 1 : print.src_line,
323 to_file_quoted, special_flags);
326 fputs (" 3 4", print.outf);
327 else if (map->sysp == 1)
328 fputs (" 3", print.outf);
330 putc ('\n', print.outf);
334 /* Called when a line of output is started. TOKEN is the first token
335 of the line, and at end of file will be CPP_EOF. */
337 cb_line_change (cpp_reader *pfile, const cpp_token *token,
340 source_location src_loc = token->src_loc;
342 if (define_queue || undef_queue)
343 dump_queued_macros (pfile);
345 if (token->type == CPP_EOF || parsing_args)
348 maybe_print_line (src_loc);
352 /* Supply enough spaces to put this token in its original column,
353 one space per column greater than 2, since scan_translation_unit
354 will provide a space if PREV_WHITE. Don't bother trying to
355 reconstruct tabs; we can't get it right in general, and nothing
356 ought to care. Some things do care; the fault lies with them. */
357 if (!CPP_OPTION (pfile, traditional))
359 const struct line_map *map = linemap_lookup (line_table, src_loc);
360 int spaces = SOURCE_COLUMN (map, src_loc) - 2;
363 while (-- spaces >= 0)
364 putc (' ', print.outf);
369 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
370 const cpp_string *str)
372 maybe_print_line (line);
373 fprintf (print.outf, "#ident %s\n", str->text);
378 cb_define (cpp_reader *pfile, source_location line, cpp_hashnode *node)
380 maybe_print_line (line);
381 fputs ("#define ", print.outf);
383 /* 'D' is whole definition; 'N' is name only. */
384 if (flag_dump_macros == 'D')
385 fputs ((const char *) cpp_macro_definition (pfile, node),
388 fputs ((const char *) NODE_NAME (node), print.outf);
390 putc ('\n', print.outf);
391 if (linemap_lookup (line_table, line)->to_line != 0)
396 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
399 maybe_print_line (line);
400 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
405 cb_used_define (cpp_reader *pfile, source_location line ATTRIBUTE_UNUSED,
409 if (node->flags & NODE_BUILTIN)
411 q = XNEW (macro_queue);
412 q->macro = xstrdup ((const char *) cpp_macro_definition (pfile, node));
413 q->next = define_queue;
418 cb_used_undef (cpp_reader *pfile ATTRIBUTE_UNUSED,
419 source_location line ATTRIBUTE_UNUSED,
423 q = XNEW (macro_queue);
424 q->macro = xstrdup ((const char *) NODE_NAME (node));
425 q->next = undef_queue;
430 dump_queued_macros (cpp_reader *pfile ATTRIBUTE_UNUSED)
434 /* End the previous line of text. */
437 putc ('\n', print.outf);
442 for (q = define_queue; q;)
445 fputs ("#define ", print.outf);
446 fputs (q->macro, print.outf);
447 putc ('\n', print.outf);
455 for (q = undef_queue; q;)
458 fprintf (print.outf, "#undef %s\n", q->macro);
469 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
470 const unsigned char *dir, const char *header, int angle_brackets,
471 const cpp_token **comments)
473 maybe_print_line (line);
475 fprintf (print.outf, "#%s <%s>", dir, header);
477 fprintf (print.outf, "#%s \"%s\"", dir, header);
479 if (comments != NULL)
481 while (*comments != NULL)
483 if ((*comments)->flags & PREV_WHITE)
484 putc (' ', print.outf);
485 cpp_output_token (*comments, print.outf);
490 putc ('\n', print.outf);
494 /* Callback called when -fworking-director and -E to emit working
495 directory in cpp output file. */
498 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
500 size_t to_file_len = strlen (dir);
501 unsigned char *to_file_quoted =
502 (unsigned char *) alloca (to_file_len * 4 + 1);
505 /* cpp_quote_string does not nul-terminate, so we have to do it ourselves. */
506 p = cpp_quote_string (to_file_quoted, (const unsigned char *) dir, to_file_len);
508 fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
511 /* The file name, line number or system header flags have changed, as
515 pp_file_change (const struct line_map *map)
517 const char *flags = "";
519 if (flag_no_line_commands)
524 if (print.first_time)
526 /* Avoid printing foo.i when the main file is foo.c. */
527 if (!cpp_get_options (parse_in)->preprocessed)
528 print_line (map->start_location, flags);
529 print.first_time = 0;
533 /* Bring current file to correct line when entering a new file. */
534 if (map->reason == LC_ENTER)
536 const struct line_map *from = INCLUDED_FROM (line_table, map);
537 maybe_print_line (LAST_SOURCE_LINE_LOCATION (from));
539 if (map->reason == LC_ENTER)
541 else if (map->reason == LC_LEAVE)
543 print_line (map->start_location, flags);
548 /* Copy a #pragma directive to the preprocessed output. */
550 cb_def_pragma (cpp_reader *pfile, source_location line)
552 maybe_print_line (line);
553 fputs ("#pragma ", print.outf);
554 cpp_output_line (pfile, print.outf);
558 /* Dump out the hash table. */
560 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
562 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
564 fputs ("#define ", print.outf);
565 fputs ((const char *) cpp_macro_definition (pfile, node),
567 putc ('\n', print.outf);
574 /* Load in the PCH file NAME, open on FD. It was originally searched for
575 by ORIG_NAME. Also, print out a #include command so that the PCH
576 file can be loaded when the preprocessed output is compiled. */
579 cb_read_pch (cpp_reader *pfile, const char *name,
580 int fd, const char *orig_name ATTRIBUTE_UNUSED)
582 c_common_read_pch (pfile, name, fd, orig_name);
584 fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name);