1 /* GNU m4 -- A simple macro processor
3 Copyright (C) 1991-1994, 2004, 2006-2007, 2009-2013 Free Software
6 This file is part of GNU M4.
8 GNU M4 is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 GNU M4 is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
27 /* File for debugging output. */
30 /* Obstack for trace messages. */
31 static struct obstack trace;
33 static void debug_set_file (FILE *);
35 /*----------------------------------.
36 | Initialise the debugging module. |
37 `----------------------------------*/
42 debug_set_file (stderr);
43 obstack_init (&trace);
46 /*-----------------------------------------------------------------.
47 | Function to decode the debugging flags OPTS. Used by main while |
48 | processing option -d, and by the builtin debugmode (). |
49 `-----------------------------------------------------------------*/
52 debug_decode (const char *opts)
56 if (opts == NULL || *opts == '\0')
57 level = DEBUG_TRACE_DEFAULT;
60 for (level = 0; *opts; opts++)
65 level |= DEBUG_TRACE_ARGS;
69 level |= DEBUG_TRACE_EXPANSION;
73 level |= DEBUG_TRACE_QUOTE;
77 level |= DEBUG_TRACE_ALL;
81 level |= DEBUG_TRACE_LINE;
85 level |= DEBUG_TRACE_FILE;
89 level |= DEBUG_TRACE_PATH;
93 level |= DEBUG_TRACE_CALL;
97 level |= DEBUG_TRACE_INPUT;
101 level |= DEBUG_TRACE_CALLID;
105 level |= DEBUG_TRACE_VERBOSE;
114 /* This is to avoid screwing up the trace output due to changes in the
117 obstack_free (&trace, obstack_finish (&trace));
122 /*-----------------------------------------------------------------.
123 | Change the debug output stream to FP. If the underlying file is |
124 | the same as stdout, use stdout instead so that debug messages |
125 | appear in the correct relative position. |
126 `-----------------------------------------------------------------*/
129 debug_set_file (FILE *fp)
131 struct stat stdout_stat, debug_stat;
133 if (debug != NULL && debug != stderr && debug != stdout
134 && close_stream (debug) != 0)
136 M4ERROR ((warning_status, errno, "error writing to debug stream"));
137 retcode = EXIT_FAILURE;
141 if (debug != NULL && debug != stdout)
143 if (fstat (STDOUT_FILENO, &stdout_stat) < 0)
145 if (fstat (fileno (debug), &debug_stat) < 0)
148 /* mingw has a bug where fstat on a regular file reports st_ino
149 of 0. On normal system, st_ino should never be 0. */
150 if (stdout_stat.st_ino == debug_stat.st_ino
151 && stdout_stat.st_dev == debug_stat.st_dev
152 && stdout_stat.st_ino != 0)
154 if (debug != stderr && close_stream (debug) != 0)
156 M4ERROR ((warning_status, errno,
157 "error writing to debug stream"));
158 retcode = EXIT_FAILURE;
165 /*-----------------------------------------------------------.
166 | Serialize files. Used before executing a system command. |
167 `-----------------------------------------------------------*/
170 debug_flush_files (void)
174 if (debug != NULL && debug != stdout && debug != stderr)
176 /* POSIX requires that if m4 doesn't consume all input, but stdin is
177 opened on a seekable file, that the file pointer be left at the
178 next character on exit (but places no restrictions on the file
179 pointer location on a non-seekable file). It also requires that
180 fflush() followed by fseeko() on an input file set the underlying
181 file pointer, and gnulib guarantees these semantics. However,
182 fflush() on a non-seekable file can lose buffered data, which we
183 might otherwise want to process after syscmd. Hence, we must
184 check whether stdin is seekable. We must also be tolerant of
185 operating with stdin closed, so we don't report any failures in
186 this attempt. The stdio-safer module and friends are essential,
187 so that if stdin was closed, this lseek is not on some other file
188 that we have since opened. */
189 if (lseek (STDIN_FILENO, 0, SEEK_CUR) >= 0
190 && fflush (stdin) == 0)
192 fseeko (stdin, 0, SEEK_CUR);
196 /*--------------------------------------------------------------.
197 | Change the debug output to file NAME. If NAME is NULL, debug |
198 | output is reverted to stderr, and if empty, debug output is |
199 | discarded. Return true iff the output stream was changed. |
200 `--------------------------------------------------------------*/
203 debug_set_output (const char *name)
208 debug_set_file (stderr);
209 else if (*name == '\0')
210 debug_set_file (NULL);
213 fp = fopen (name, "a");
217 if (set_cloexec_flag (fileno (fp), true) != 0)
218 M4ERROR ((warning_status, errno,
219 "Warning: cannot protect debug file across forks"));
225 /*--------------------------------------------------------------.
226 | Print the header of a one-line debug message, starting by "m4 |
228 `--------------------------------------------------------------*/
231 debug_message_prefix (void)
233 xfprintf (debug, "m4debug:");
236 if (debug_level & DEBUG_TRACE_FILE)
237 xfprintf (debug, "%s:", current_file);
238 if (debug_level & DEBUG_TRACE_LINE)
239 xfprintf (debug, "%d:", current_line);
244 /* The rest of this file contains the functions for macro tracing output.
245 All tracing output for a macro call is collected on an obstack TRACE,
246 and printed whenever the line is complete. This prevents tracing
247 output from interfering with other debug messages generated by the
250 /*------------------------------------------------------------------.
251 | Tracing output is formatted here, by a simplified |
252 | printf-to-obstack function trace_format (). Understands only %S, |
253 | %s, %d, %l (optional left quote) and %r (optional right quote). |
254 `------------------------------------------------------------------*/
257 trace_format (const char *fmt, ...)
267 va_start (args, fmt);
271 while ((ch = *fmt++) != '\0' && ch != '%')
272 obstack_1grow (&trace, ch);
281 maxlen = max_debug_argument_length;
285 s = va_arg (args, const char *);
289 s = (debug_level & DEBUG_TRACE_QUOTE) ? lquote.string : "";
293 s = (debug_level & DEBUG_TRACE_QUOTE) ? rquote.string : "";
297 d = va_arg (args, int);
307 if (maxlen == 0 || maxlen > slen)
308 obstack_grow (&trace, s, slen);
311 obstack_grow (&trace, s, maxlen);
312 obstack_grow (&trace, "...", 3);
319 /*------------------------------------------------------------------.
320 | Format the standard header attached to all tracing output lines. |
321 `------------------------------------------------------------------*/
324 trace_header (int id)
326 trace_format ("m4trace:");
329 if (debug_level & DEBUG_TRACE_FILE)
330 trace_format ("%s:", current_file);
331 if (debug_level & DEBUG_TRACE_LINE)
332 trace_format ("%d:", current_line);
334 trace_format (" -%d- ", expansion_level);
335 if (debug_level & DEBUG_TRACE_CALLID)
336 trace_format ("id %d: ", id);
339 /*----------------------------------------------------.
340 | Print current tracing line, and clear the obstack. |
341 `----------------------------------------------------*/
348 obstack_1grow (&trace, '\0');
349 line = (char *) obstack_finish (&trace);
350 DEBUG_PRINT1 ("%s\n", line);
351 obstack_free (&trace, line);
354 /*-------------------------------------------------------------.
355 | Do pre-argument-collction tracing for macro NAME. Used from |
357 `-------------------------------------------------------------*/
360 trace_prepre (const char *name, int id)
363 trace_format ("%s ...", name);
367 /*--------------------------------------------------------------.
368 | Format the parts of a trace line, that can be made before the |
369 | macro is actually expanded. Used from expand_macro (). |
370 `--------------------------------------------------------------*/
373 trace_pre (const char *name, int id, int argc, token_data **argv)
379 trace_format ("%s", name);
381 if (argc > 1 && (debug_level & DEBUG_TRACE_ARGS))
385 for (i = 1; i < argc; i++)
390 switch (TOKEN_DATA_TYPE (argv[i]))
393 trace_format ("%l%S%r", TOKEN_DATA_TEXT (argv[i]));
397 bp = find_builtin_by_addr (TOKEN_DATA_FUNC (argv[i]));
400 M4ERROR ((warning_status, 0, "\
401 INTERNAL ERROR: builtin not found in builtin table! (trace_pre ())"));
404 trace_format ("<%s>", bp->name);
409 M4ERROR ((warning_status, 0,
410 "INTERNAL ERROR: bad token data type (trace_pre ())"));
418 if (debug_level & DEBUG_TRACE_CALL)
420 trace_format (" -> ???");
425 /*-------------------------------------------------------------------.
426 | Format the final part of a trace line and print it all. Used from |
428 `-------------------------------------------------------------------*/
431 trace_post (const char *name, int id, int argc, const char *expanded)
433 if (debug_level & DEBUG_TRACE_CALL)
436 trace_format ("%s%s", name, (argc > 1) ? "(...)" : "");
439 if (expanded && (debug_level & DEBUG_TRACE_EXPANSION))
440 trace_format (" -> %l%S%r", expanded);