1 /* File format for coverage information
2 Copyright (C) 1996, 1997, 1998, 2000, 2002,
3 2003 Free Software Foundation, Inc.
4 Contributed by Bob Manson <manson@cygnus.com>.
5 Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 2, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING. If not, write to the Free
21 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 /* Routines declared in gcov-io.h. This file should be #included by
25 another source file, after having #included gcov-io.h. */
27 /* Open a gcov file. NAME is the name of the file to open and MODE
28 indicates whether a new file should be created, or an existing file
29 opened for modification. If MODE is >= 0 an existing file will be
30 opened, if possible, and if MODE is <= 0, a new file will be
31 created. Use MODE=0 to attempt to reopen an existing file and then
32 fall back on creating a new one. Return zero on failure, >0 on
33 opening an existing file and <0 on creating a new one. */
36 gcov_open (const char *name
, int mode
)
40 #if defined (TARGET_HAS_F_SETLKW) && IN_LIBGCOV
43 s_flock
.l_type
= F_WRLCK
;
44 s_flock
.l_whence
= SEEK_SET
;
46 s_flock
.l_len
= 0; /* Until EOF. */
47 s_flock
.l_pid
= getpid ();
52 gcov_var
.position
= gcov_var
.length
= 0;
53 gcov_var
.error
= gcov_var
.modified
= 0;
55 gcov_var
.file
= fopen (name
, "r+b");
56 if (!gcov_var
.file
&& mode
<= 0)
59 gcov_var
.file
= fopen (name
, "w+b");
64 #if defined (TARGET_HAS_F_SETLKW) && IN_LIBGCOV
65 while (fcntl (fileno (gcov_var
.file
), F_SETLKW
, &s_flock
)
72 if (fseek (gcov_var
.file
, 0, SEEK_END
))
74 fclose (gcov_var
.file
);
78 gcov_var
.length
= ftell (gcov_var
.file
);
79 fseek (gcov_var
.file
, 0, SEEK_SET
);
80 alloc
+= gcov_var
.length
;
82 if (alloc
> gcov_var
.alloc
)
85 free (gcov_var
.buffer
);
86 gcov_var
.alloc
= alloc
;
88 gcov_var
.buffer
= malloc (gcov_var
.alloc
);
91 fclose (gcov_var
.file
);
98 gcov_var
.buffer
= xmalloc (gcov_var
.alloc
);
102 && fread (gcov_var
.buffer
, gcov_var
.length
, 1, gcov_var
.file
) != 1)
104 fclose (gcov_var
.file
);
112 /* Close the current gcov file. Flushes data to disk. Returns nonzero
113 on failure or error flag set. */
122 if (gcov_var
.modified
123 && (fseek (gcov_var
.file
, 0, SEEK_SET
)
124 || fwrite (gcov_var
.buffer
, gcov_var
.length
,
125 1, gcov_var
.file
) != 1))
127 fclose (gcov_var
.file
);
132 free (gcov_var
.buffer
);
136 return result
? 1 : gcov_var
.error
;
140 /* Allocate space to write BYTES bytes to the gcov file. Return a
141 pointer to those bytes, or NULL on failure. */
143 GCOV_LINKAGE
unsigned char *
144 gcov_write_bytes (unsigned bytes
)
146 char unsigned *result
;
148 if (gcov_var
.position
+ bytes
> gcov_var
.alloc
)
150 size_t new_size
= (gcov_var
.alloc
+ bytes
) * 3 / 2;
152 if (!gcov_var
.buffer
)
155 result
= realloc (gcov_var
.buffer
, new_size
);
158 free (gcov_var
.buffer
);
161 gcov_var
.position
= gcov_var
.length
= 0;
166 result
= xrealloc (gcov_var
.buffer
, new_size
);
168 gcov_var
.alloc
= new_size
;
169 gcov_var
.buffer
= result
;
172 result
= &gcov_var
.buffer
[gcov_var
.position
];
173 gcov_var
.position
+= bytes
;
174 gcov_var
.modified
= 1;
175 if (gcov_var
.position
> gcov_var
.length
)
176 gcov_var
.length
= gcov_var
.position
;
180 /* Write unsigned VALUE to coverage file. Sets error flag
184 gcov_write_unsigned (unsigned value
)
186 unsigned char *buffer
= gcov_write_bytes (4);
196 if (sizeof (value
) > 4 && value
)
202 /* Write counter VALUE to coverage file. Sets error flag
207 gcov_write_counter (gcov_type value
)
209 unsigned char *buffer
= gcov_write_bytes (8);
219 if ((sizeof (value
) > 8 && value
) || value
< 0)
223 #endif /* IN_LIBGCOV */
226 /* Write STRING to coverage file. Sets error flag on file
227 error, overflow flag on overflow */
230 gcov_write_string (const char *string
)
235 unsigned char *buffer
;
239 length
= strlen (string
);
240 rem
= 4 - (length
& 3);
243 buffer
= gcov_write_bytes (4 + length
+ rem
);
247 unsigned value
= length
;
254 memcpy (buffer
+ 4, string
, length
);
255 memcpy (buffer
+ 4 + length
, &pad
, rem
);
260 /* Write a tag TAG and reserve space for the record length. Return a
261 value to be used for gcov_write_length. */
263 GCOV_LINKAGE
unsigned long
264 gcov_write_tag (unsigned tag
)
266 unsigned long result
= gcov_var
.position
;
267 unsigned char *buffer
= gcov_write_bytes (8);
277 memset (buffer
+ 4, 0, 4);
281 /* Write a record length using POSITION, which was returned by
282 gcov_write_tag. The current file position is the end of the
283 record, and is restored before returning. Returns nonzero on
287 gcov_write_length (unsigned long position
)
291 unsigned length
= gcov_var
.position
- position
- 8;
292 unsigned char *buffer
= &gcov_var
.buffer
[position
+ 4];
304 /* Write a summary structure to the gcov file. Return non-zero on
308 gcov_write_summary (unsigned tag
, const struct gcov_summary
*summary
)
311 const struct gcov_ctr_summary
*csum
;
314 base
= gcov_write_tag (tag
);
315 gcov_write_unsigned (summary
->checksum
);
316 for (csum
= summary
->ctrs
, ix
= GCOV_COUNTERS
; ix
--; csum
++)
318 gcov_write_unsigned (csum
->num
);
319 gcov_write_unsigned (csum
->runs
);
320 gcov_write_counter (csum
->sum_all
);
321 gcov_write_counter (csum
->run_max
);
322 gcov_write_counter (csum
->sum_max
);
324 gcov_write_length (base
);
326 #endif /* IN_LIBGCOV */
330 /* Return a pointer to read BYTES bytes from the gcov file. Returns
331 NULL on failure (read past EOF). */
333 GCOV_LINKAGE
const unsigned char *
334 gcov_read_bytes (unsigned bytes
)
336 const unsigned char *result
;
338 if (gcov_var
.position
+ bytes
> gcov_var
.length
)
344 result
= &gcov_var
.buffer
[gcov_var
.position
];
345 gcov_var
.position
+= bytes
;
349 /* Read unsigned value from a coverage file. Sets error flag on file
350 error, overflow flag on overflow */
352 GCOV_LINKAGE
unsigned
353 gcov_read_unsigned ()
357 const unsigned char *buffer
= gcov_read_bytes (4);
361 for (ix
= sizeof (value
); ix
< 4; ix
++)
364 for (ix
= 0; ix
!= 4; ix
++)
372 /* Read counter value from a coverage file. Sets error flag on file
373 error, overflow flag on overflow */
375 GCOV_LINKAGE gcov_type
380 const unsigned char *buffer
= gcov_read_bytes (8);
384 for (ix
= sizeof (value
); ix
< 8; ix
++)
387 for (ix
= 0; ix
!= 8; ix
++)
397 /* Read string from coverage file. Returns a pointer to a static
398 buffer, or NULL on empty string. You must copy the string before
399 calling another gcov function. */
402 GCOV_LINKAGE
const char *
405 unsigned length
= gcov_read_unsigned ();
410 length
+= 4 - (length
& 3);
411 return (const char *) gcov_read_bytes (length
);
416 gcov_read_summary (struct gcov_summary
*summary
)
419 struct gcov_ctr_summary
*csum
;
421 summary
->checksum
= gcov_read_unsigned ();
422 for (csum
= summary
->ctrs
, ix
= GCOV_COUNTERS
; ix
--; csum
++)
424 csum
->num
= gcov_read_unsigned ();
425 csum
->runs
= gcov_read_unsigned ();
426 csum
->sum_all
= gcov_read_counter ();
427 csum
->run_max
= gcov_read_counter ();
428 csum
->sum_max
= gcov_read_counter ();
433 /* Return the modification time of the current gcov file. */
440 if (fstat (fileno (gcov_var
.file
), &status
))
443 return status
.st_mtime
;