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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [gcov-io.h] - Blame information for rev 816

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1 38 julius
/* File format for coverage information
2
   Copyright (C) 1996, 1997, 1998, 2000, 2002,
3
   2003, 2004, 2005 Free Software Foundation, Inc.
4
   Contributed by Bob Manson <manson@cygnus.com>.
5
   Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
6
 
7
This file is part of GCC.
8
 
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
12
version.
13
 
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
17
for more details.
18
 
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, 51 Franklin Street, Fifth Floor, Boston, MA
22
02110-1301, USA.  */
23
 
24
/* As a special exception, if you link this library with other files,
25
   some of which are compiled with GCC, to produce an executable,
26
   this library does not by itself cause the resulting executable
27
   to be covered by the GNU General Public License.
28
   This exception does not however invalidate any other reasons why
29
   the executable file might be covered by the GNU General Public License.  */
30
 
31
/* Coverage information is held in two files.  A notes file, which is
32
   generated by the compiler, and a data file, which is generated by
33
   the program under test.  Both files use a similar structure.  We do
34
   not attempt to make these files backwards compatible with previous
35
   versions, as you only need coverage information when developing a
36
   program.  We do hold version information, so that mismatches can be
37
   detected, and we use a format that allows tools to skip information
38
   they do not understand or are not interested in.
39
 
40
   Numbers are recorded in the 32 bit unsigned binary form of the
41
   endianness of the machine generating the file. 64 bit numbers are
42
   stored as two 32 bit numbers, the low part first.  Strings are
43
   padded with 1 to 4 NUL bytes, to bring the length up to a multiple
44
   of 4. The number of 4 bytes is stored, followed by the padded
45
   string. Zero length and NULL strings are simply stored as a length
46
   of zero (they have no trailing NUL or padding).
47
 
48
        int32:  byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3
49
        int64:  int32:low int32:high
50
        string: int32:0 | int32:length char* char:0 padding
51
        padding: | char:0 | char:0 char:0 | char:0 char:0 char:0
52
        item: int32 | int64 | string
53
 
54
   The basic format of the files is
55
 
56
        file : int32:magic int32:version int32:stamp record*
57
 
58
   The magic ident is different for the notes and the data files.  The
59
   magic ident is used to determine the endianness of the file, when
60
   reading.  The version is the same for both files and is derived
61
   from gcc's version number. The stamp value is used to synchronize
62
   note and data files and to synchronize merging within a data
63
   file. It need not be an absolute time stamp, merely a ticker that
64
   increments fast enough and cycles slow enough to distinguish
65
   different compile/run/compile cycles.
66
 
67
   Although the ident and version are formally 32 bit numbers, they
68
   are derived from 4 character ASCII strings.  The version number
69
   consists of the single character major version number, a two
70
   character minor version number (leading zero for versions less than
71
   10), and a single character indicating the status of the release.
72
   That will be 'e' experimental, 'p' prerelease and 'r' for release.
73
   Because, by good fortune, these are in alphabetical order, string
74
   collating can be used to compare version strings.  Be aware that
75
   the 'e' designation will (naturally) be unstable and might be
76
   incompatible with itself.  For gcc 3.4 experimental, it would be
77
   '304e' (0x33303465).  When the major version reaches 10, the
78
   letters A-Z will be used.  Assuming minor increments releases every
79
   6 months, we have to make a major increment every 50 years.
80
   Assuming major increments releases every 5 years, we're ok for the
81
   next 155 years -- good enough for me.
82
 
83
   A record has a tag, length and variable amount of data.
84
 
85
        record: header data
86
        header: int32:tag int32:length
87
        data: item*
88
 
89
   Records are not nested, but there is a record hierarchy.  Tag
90
   numbers reflect this hierarchy.  Tags are unique across note and
91
   data files.  Some record types have a varying amount of data.  The
92
   LENGTH is the number of 4bytes that follow and is usually used to
93
   determine how much data.  The tag value is split into 4 8-bit
94
   fields, one for each of four possible levels.  The most significant
95
   is allocated first.  Unused levels are zero.  Active levels are
96
   odd-valued, so that the LSB of the level is one.  A sub-level
97
   incorporates the values of its superlevels.  This formatting allows
98
   you to determine the tag hierarchy, without understanding the tags
99
   themselves, and is similar to the standard section numbering used
100
   in technical documents.  Level values [1..3f] are used for common
101
   tags, values [41..9f] for the notes file and [a1..ff] for the data
102
   file.
103
 
104
   The basic block graph file contains the following records
105
        note: unit function-graph*
106
        unit: header int32:checksum string:source
107
        function-graph: announce_function basic_blocks {arcs | lines}*
108
        announce_function: header int32:ident int32:checksum
109
                string:name string:source int32:lineno
110
        basic_block: header int32:flags*
111
        arcs: header int32:block_no arc*
112
        arc:  int32:dest_block int32:flags
113
        lines: header int32:block_no line*
114
               int32:0 string:NULL
115
        line:  int32:line_no | int32:0 string:filename
116
 
117
   The BASIC_BLOCK record holds per-bb flags.  The number of blocks
118
   can be inferred from its data length.  There is one ARCS record per
119
   basic block.  The number of arcs from a bb is implicit from the
120
   data length.  It enumerates the destination bb and per-arc flags.
121
   There is one LINES record per basic block, it enumerates the source
122
   lines which belong to that basic block.  Source file names are
123
   introduced by a line number of 0, following lines are from the new
124
   source file.  The initial source file for the function is NULL, but
125
   the current source file should be remembered from one LINES record
126
   to the next.  The end of a block is indicated by an empty filename
127
   - this does not reset the current source file.  Note there is no
128
   ordering of the ARCS and LINES records: they may be in any order,
129
   interleaved in any manner.  The current filename follows the order
130
   the LINES records are stored in the file, *not* the ordering of the
131
   blocks they are for.
132
 
133
   The data file contains the following records.
134
        data: {unit function-data* summary:object summary:program*}*
135
        unit: header int32:checksum
136
        function-data:  announce_function arc_counts
137
        announce_function: header int32:ident int32:checksum
138
        arc_counts: header int64:count*
139
        summary: int32:checksum {count-summary}GCOV_COUNTERS
140
        count-summary:  int32:num int32:runs int64:sum
141
                        int64:max int64:sum_max
142
 
143
   The ANNOUNCE_FUNCTION record is the same as that in the note file,
144
   but without the source location.  The ARC_COUNTS gives the counter
145
   values for those arcs that are instrumented.  The SUMMARY records
146
   give information about the whole object file and about the whole
147
   program.  The checksum is used for whole program summaries, and
148
   disambiguates different programs which include the same
149
   instrumented object file.  There may be several program summaries,
150
   each with a unique checksum.  The object summary's checksum is zero.
151
   Note that the data file might contain information from several runs
152
   concatenated, or the data might be merged.
153
 
154
   This file is included by both the compiler, gcov tools and the
155
   runtime support library libgcov. IN_LIBGCOV and IN_GCOV are used to
156
   distinguish which case is which.  If IN_LIBGCOV is nonzero,
157
   libgcov is being built. If IN_GCOV is nonzero, the gcov tools are
158
   being built. Otherwise the compiler is being built. IN_GCOV may be
159
   positive or negative. If positive, we are compiling a tool that
160
   requires additional functions (see the code for knowledge of what
161
   those functions are).  */
162
 
163
#ifndef GCC_GCOV_IO_H
164
#define GCC_GCOV_IO_H
165
 
166
#if IN_LIBGCOV
167
/* About the target */
168
 
169
#if BITS_PER_UNIT == 8
170
typedef unsigned gcov_unsigned_t __attribute__ ((mode (SI)));
171
typedef unsigned gcov_position_t __attribute__ ((mode (SI)));
172
#if LONG_LONG_TYPE_SIZE > 32
173
typedef signed gcov_type __attribute__ ((mode (DI)));
174
#else
175
typedef signed gcov_type __attribute__ ((mode (SI)));
176
#endif
177
#else
178
#if BITS_PER_UNIT == 16
179
typedef unsigned gcov_unsigned_t __attribute__ ((mode (HI)));
180
typedef unsigned gcov_position_t __attribute__ ((mode (HI)));
181
#if LONG_LONG_TYPE_SIZE > 32
182
typedef signed gcov_type __attribute__ ((mode (SI)));
183
#else
184
typedef signed gcov_type __attribute__ ((mode (HI)));
185
#endif
186
#else
187
typedef unsigned gcov_unsigned_t __attribute__ ((mode (QI)));
188
typedef unsigned gcov_position_t __attribute__ ((mode (QI)));
189
#if LONG_LONG_TYPE_SIZE > 32
190
typedef signed gcov_type __attribute__ ((mode (HI)));
191
#else
192
typedef signed gcov_type __attribute__ ((mode (QI)));
193
#endif
194
#endif
195
#endif
196
 
197
 
198
#if defined (TARGET_POSIX_IO)
199
#define GCOV_LOCKED 1
200
#else
201
#define GCOV_LOCKED 0
202
#endif
203
 
204
#else /* !IN_LIBGCOV */
205
/* About the host */
206
 
207
typedef unsigned gcov_unsigned_t;
208
typedef unsigned gcov_position_t;
209
/* gcov_type is typedef'd elsewhere for the compiler */
210
#if IN_GCOV
211
#define GCOV_LINKAGE static
212
typedef HOST_WIDEST_INT gcov_type;
213
#if IN_GCOV > 0
214
#include <sys/types.h>
215
#endif
216
#else /*!IN_GCOV */
217
#define GCOV_TYPE_SIZE (LONG_LONG_TYPE_SIZE > 32 ? 64 : 32)
218
#endif
219
 
220
#if defined (HOST_HAS_F_SETLKW)
221
#define GCOV_LOCKED 1
222
#else
223
#define GCOV_LOCKED 0
224
#endif
225
 
226
#endif /* !IN_LIBGCOV */
227
 
228
/* In gcov we want function linkage to be static.  In the compiler we want
229
   it extern, so that they can be accessed from elsewhere.  In libgcov we
230
   need these functions to be extern, so prefix them with __gcov.  In
231
   libgcov they must also be hidden so that the instance in the executable
232
   is not also used in a DSO.  */
233
#if IN_LIBGCOV
234
 
235
#include "tconfig.h"
236
 
237
#define gcov_var __gcov_var
238
#define gcov_open __gcov_open
239
#define gcov_close __gcov_close
240
#define gcov_write_tag_length __gcov_write_tag_length
241
#define gcov_position __gcov_position
242
#define gcov_seek __gcov_seek
243
#define gcov_rewrite __gcov_rewrite
244
#define gcov_is_error __gcov_is_error
245
#define gcov_write_unsigned __gcov_write_unsigned
246
#define gcov_write_counter __gcov_write_counter
247
#define gcov_write_summary __gcov_write_summary
248
#define gcov_read_unsigned __gcov_read_unsigned
249
#define gcov_read_counter __gcov_read_counter
250
#define gcov_read_summary __gcov_read_summary
251
 
252
/* Poison these, so they don't accidentally slip in.  */
253
#pragma GCC poison gcov_write_string gcov_write_tag gcov_write_length
254
#pragma GCC poison gcov_read_string gcov_sync gcov_time gcov_magic
255
 
256
#ifdef HAVE_GAS_HIDDEN
257
#define ATTRIBUTE_HIDDEN  __attribute__ ((__visibility__ ("hidden")))
258
#else
259
#define ATTRIBUTE_HIDDEN
260
#endif
261
 
262
#else
263
 
264
#define ATTRIBUTE_HIDDEN
265
 
266
#endif
267
 
268
#ifndef GCOV_LINKAGE
269
#define GCOV_LINKAGE extern
270
#endif
271
 
272
/* File suffixes.  */
273
#define GCOV_DATA_SUFFIX ".gcda"
274
#define GCOV_NOTE_SUFFIX ".gcno"
275
 
276
/* File magic. Must not be palindromes.  */
277
#define GCOV_DATA_MAGIC ((gcov_unsigned_t)0x67636461) /* "gcda" */
278
#define GCOV_NOTE_MAGIC ((gcov_unsigned_t)0x67636e6f) /* "gcno" */
279
 
280
/* gcov-iov.h is automatically generated by the makefile from
281
   version.c, it looks like
282
        #define GCOV_VERSION ((gcov_unsigned_t)0x89abcdef)
283
*/
284
#include "gcov-iov.h"
285
 
286
/* Convert a magic or version number to a 4 character string.  */
287
#define GCOV_UNSIGNED2STRING(ARRAY,VALUE)       \
288
  ((ARRAY)[0] = (char)((VALUE) >> 24),           \
289
   (ARRAY)[1] = (char)((VALUE) >> 16),          \
290
   (ARRAY)[2] = (char)((VALUE) >> 8),           \
291
   (ARRAY)[3] = (char)((VALUE) >> 0))
292
 
293
/* The record tags.  Values [1..3f] are for tags which may be in either
294
   file.  Values [41..9f] for those in the note file and [a1..ff] for
295
   the data file.  The tag value zero is used as an explicit end of
296
   file marker -- it is not required to be present.  */
297
 
298
#define GCOV_TAG_FUNCTION        ((gcov_unsigned_t)0x01000000)
299
#define GCOV_TAG_FUNCTION_LENGTH (2)
300
#define GCOV_TAG_BLOCKS          ((gcov_unsigned_t)0x01410000)
301
#define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM)
302
#define GCOV_TAG_BLOCKS_NUM(LENGTH) (LENGTH)
303
#define GCOV_TAG_ARCS            ((gcov_unsigned_t)0x01430000)
304
#define GCOV_TAG_ARCS_LENGTH(NUM)  (1 + (NUM) * 2)
305
#define GCOV_TAG_ARCS_NUM(LENGTH)  (((LENGTH) - 1) / 2)
306
#define GCOV_TAG_LINES           ((gcov_unsigned_t)0x01450000)
307
#define GCOV_TAG_COUNTER_BASE    ((gcov_unsigned_t)0x01a10000)
308
#define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2)
309
#define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2)
310
#define GCOV_TAG_OBJECT_SUMMARY  ((gcov_unsigned_t)0xa1000000)
311
#define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000)
312
#define GCOV_TAG_SUMMARY_LENGTH  \
313
        (1 + GCOV_COUNTERS_SUMMABLE * (2 + 3 * 2))
314
 
315
/* Counters that are collected.  */
316
#define GCOV_COUNTER_ARCS       0  /* Arc transitions.  */
317
#define GCOV_COUNTERS_SUMMABLE  1  /* Counters which can be
318
                                      summaried.  */
319
#define GCOV_FIRST_VALUE_COUNTER 1 /* The first of counters used for value
320
                                      profiling.  They must form a consecutive
321
                                      interval and their order must match
322
                                      the order of HIST_TYPEs in
323
                                      value-prof.h.  */
324
#define GCOV_COUNTER_V_INTERVAL 1  /* Histogram of value inside an interval.  */
325
#define GCOV_COUNTER_V_POW2     2  /* Histogram of exact power2 logarithm
326
                                      of a value.  */
327
#define GCOV_COUNTER_V_SINGLE   3  /* The most common value of expression.  */
328
#define GCOV_COUNTER_V_DELTA    4  /* The most common difference between
329
                                      consecutive values of expression.  */
330
#define GCOV_LAST_VALUE_COUNTER 4  /* The last of counters used for value
331
                                      profiling.  */
332
#define GCOV_COUNTERS           5
333
 
334
/* Number of counters used for value profiling.  */
335
#define GCOV_N_VALUE_COUNTERS \
336
  (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1)
337
 
338
  /* A list of human readable names of the counters */
339
#define GCOV_COUNTER_NAMES      {"arcs", "interval", "pow2", "single", "delta"}
340
 
341
  /* Names of merge functions for counters.  */
342
#define GCOV_MERGE_FUNCTIONS    {"__gcov_merge_add",    \
343
                                 "__gcov_merge_add",    \
344
                                 "__gcov_merge_add",    \
345
                                 "__gcov_merge_single", \
346
                                 "__gcov_merge_delta"}
347
 
348
/* Convert a counter index to a tag.  */
349
#define GCOV_TAG_FOR_COUNTER(COUNT)                             \
350
        (GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17))
351
/* Convert a tag to a counter.  */
352
#define GCOV_COUNTER_FOR_TAG(TAG)                                       \
353
        ((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17))
354
/* Check whether a tag is a counter tag.  */
355
#define GCOV_TAG_IS_COUNTER(TAG)                                \
356
        (!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS)
357
 
358
/* The tag level mask has 1's in the position of the inner levels, &
359
   the lsb of the current level, and zero on the current and outer
360
   levels.  */
361
#define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG))
362
 
363
/* Return nonzero if SUB is an immediate subtag of TAG.  */
364
#define GCOV_TAG_IS_SUBTAG(TAG,SUB)                             \
365
        (GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB)        \
366
         && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK(TAG)))
367
 
368
/* Return nonzero if SUB is at a sublevel to TAG.  */
369
#define GCOV_TAG_IS_SUBLEVEL(TAG,SUB)                           \
370
        (GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB))
371
 
372
/* Basic block flags.  */
373
#define GCOV_BLOCK_UNEXPECTED   (1 << 1)
374
 
375
/* Arc flags.  */
376
#define GCOV_ARC_ON_TREE        (1 << 0)
377
#define GCOV_ARC_FAKE           (1 << 1)
378
#define GCOV_ARC_FALLTHROUGH    (1 << 2)
379
 
380
/* Structured records.  */
381
 
382
/* Cumulative counter data.  */
383
struct gcov_ctr_summary
384
{
385
  gcov_unsigned_t num;          /* number of counters.  */
386
  gcov_unsigned_t runs;         /* number of program runs */
387
  gcov_type sum_all;            /* sum of all counters accumulated.  */
388
  gcov_type run_max;            /* maximum value on a single run.  */
389
  gcov_type sum_max;            /* sum of individual run max values.  */
390
};
391
 
392
/* Object & program summary record.  */
393
struct gcov_summary
394
{
395
  gcov_unsigned_t checksum;     /* checksum of program */
396
  struct gcov_ctr_summary ctrs[GCOV_COUNTERS_SUMMABLE];
397
};
398
 
399
/* Structures embedded in coveraged program.  The structures generated
400
   by write_profile must match these.  */
401
 
402
#if IN_LIBGCOV
403
/* Information about a single function.  This uses the trailing array
404
   idiom. The number of counters is determined from the counter_mask
405
   in gcov_info.  We hold an array of function info, so have to
406
   explicitly calculate the correct array stride.  */
407
struct gcov_fn_info
408
{
409
  gcov_unsigned_t ident;        /* unique ident of function */
410
  gcov_unsigned_t checksum;     /* function checksum */
411
  unsigned n_ctrs[0];            /* instrumented counters */
412
};
413
 
414
/* Type of function used to merge counters.  */
415
typedef void (*gcov_merge_fn) (gcov_type *, gcov_unsigned_t);
416
 
417
/* Information about counters.  */
418
struct gcov_ctr_info
419
{
420
  gcov_unsigned_t num;          /* number of counters.  */
421
  gcov_type *values;            /* their values.  */
422
  gcov_merge_fn merge;          /* The function used to merge them.  */
423
};
424
 
425
/* Information about a single object file.  */
426
struct gcov_info
427
{
428
  gcov_unsigned_t version;      /* expected version number */
429
  struct gcov_info *next;       /* link to next, used by libgcov */
430
 
431
  gcov_unsigned_t stamp;        /* uniquifying time stamp */
432
  const char *filename;         /* output file name */
433
 
434
  unsigned n_functions;         /* number of functions */
435
  const struct gcov_fn_info *functions; /* table of functions */
436
 
437
  unsigned ctr_mask;            /* mask of counters instrumented.  */
438
  struct gcov_ctr_info counts[0]; /* count data. The number of bits
439
                                     set in the ctr_mask field
440
                                     determines how big this array
441
                                     is.  */
442
};
443
 
444
/* Register a new object file module.  */
445
extern void __gcov_init (struct gcov_info *) ATTRIBUTE_HIDDEN;
446
 
447
/* Called before fork, to avoid double counting.  */
448
extern void __gcov_flush (void) ATTRIBUTE_HIDDEN;
449
 
450
/* The merge function that just sums the counters.  */
451
extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
452
 
453
/* The merge function to choose the most common value.  */
454
extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
455
 
456
/* The merge function to choose the most common difference between
457
   consecutive values.  */
458
extern void __gcov_merge_delta (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
459
 
460
/* The profiler functions.  */
461
extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned);
462
extern void __gcov_pow2_profiler (gcov_type *, gcov_type);
463
extern void __gcov_one_value_profiler (gcov_type *, gcov_type);
464
 
465
#ifndef inhibit_libc
466
/* The wrappers around some library functions..  */
467
extern pid_t __gcov_fork (void);
468
extern int __gcov_execl (const char *, const char *, ...) ATTRIBUTE_HIDDEN;
469
extern int __gcov_execlp (const char *, const char *, ...) ATTRIBUTE_HIDDEN;
470
extern int __gcov_execle (const char *,  const char *, ...) ATTRIBUTE_HIDDEN;
471
extern int __gcov_execv (const char *, char *const []) ATTRIBUTE_HIDDEN;
472
extern int __gcov_execvp (const char *, char *const []) ATTRIBUTE_HIDDEN;
473
extern int __gcov_execve (const char *, char  *const [], char *const [])
474
  ATTRIBUTE_HIDDEN;
475
#endif
476
 
477
#endif /* IN_LIBGCOV */
478
 
479
#if IN_LIBGCOV >= 0
480
 
481
/* Optimum number of gcov_unsigned_t's read from or written to disk.  */
482
#define GCOV_BLOCK_SIZE (1 << 10)
483
 
484
GCOV_LINKAGE struct gcov_var
485
{
486
  FILE *file;
487
  gcov_position_t start;        /* Position of first byte of block */
488
  unsigned offset;              /* Read/write position within the block.  */
489
  unsigned length;              /* Read limit in the block.  */
490
  unsigned overread;            /* Number of words overread.  */
491
  int error;                    /* < 0 overflow, > 0 disk error.  */
492
  int mode;                     /* < 0 writing, > 0 reading */
493
#if IN_LIBGCOV
494
  /* Holds one block plus 4 bytes, thus all coverage reads & writes
495
     fit within this buffer and we always can transfer GCOV_BLOCK_SIZE
496
     to and from the disk. libgcov never backtracks and only writes 4
497
     or 8 byte objects.  */
498
  gcov_unsigned_t buffer[GCOV_BLOCK_SIZE + 1];
499
#else
500
  int endian;                   /* Swap endianness.  */
501
  /* Holds a variable length block, as the compiler can write
502
     strings and needs to backtrack.  */
503
  size_t alloc;
504
  gcov_unsigned_t *buffer;
505
#endif
506
} gcov_var ATTRIBUTE_HIDDEN;
507
 
508
/* Functions for reading and writing gcov files. In libgcov you can
509
   open the file for reading then writing. Elsewhere you can open the
510
   file either for reading or for writing. When reading a file you may
511
   use the gcov_read_* functions, gcov_sync, gcov_position, &
512
   gcov_error. When writing a file you may use the gcov_write
513
   functions, gcov_seek & gcov_error. When a file is to be rewritten
514
   you use the functions for reading, then gcov_rewrite then the
515
   functions for writing.  Your file may become corrupted if you break
516
   these invariants.  */
517
#if IN_LIBGCOV
518
GCOV_LINKAGE int gcov_open (const char */*name*/) ATTRIBUTE_HIDDEN;
519
#else
520
GCOV_LINKAGE int gcov_open (const char */*name*/, int /*direction*/);
521
GCOV_LINKAGE int gcov_magic (gcov_unsigned_t, gcov_unsigned_t);
522
#endif
523
GCOV_LINKAGE int gcov_close (void) ATTRIBUTE_HIDDEN;
524
 
525
/* Available everywhere.  */
526
static gcov_position_t gcov_position (void);
527
static int gcov_is_error (void);
528
 
529
GCOV_LINKAGE gcov_unsigned_t gcov_read_unsigned (void) ATTRIBUTE_HIDDEN;
530
GCOV_LINKAGE gcov_type gcov_read_counter (void) ATTRIBUTE_HIDDEN;
531
GCOV_LINKAGE void gcov_read_summary (struct gcov_summary *) ATTRIBUTE_HIDDEN;
532
 
533
#if IN_LIBGCOV
534
/* Available only in libgcov */
535
GCOV_LINKAGE void gcov_write_counter (gcov_type) ATTRIBUTE_HIDDEN;
536
GCOV_LINKAGE void gcov_write_tag_length (gcov_unsigned_t, gcov_unsigned_t)
537
    ATTRIBUTE_HIDDEN;
538
GCOV_LINKAGE void gcov_write_summary (gcov_unsigned_t /*tag*/,
539
                                      const struct gcov_summary *)
540
    ATTRIBUTE_HIDDEN;
541
static void gcov_rewrite (void);
542
GCOV_LINKAGE void gcov_seek (gcov_position_t /*position*/) ATTRIBUTE_HIDDEN;
543
#else
544
/* Available outside libgcov */
545
GCOV_LINKAGE const char *gcov_read_string (void);
546
GCOV_LINKAGE void gcov_sync (gcov_position_t /*base*/,
547
                             gcov_unsigned_t /*length */);
548
#endif
549
 
550
#if !IN_GCOV
551
/* Available outside gcov */
552
GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t) ATTRIBUTE_HIDDEN;
553
#endif
554
 
555
#if !IN_GCOV && !IN_LIBGCOV
556
/* Available only in compiler */
557
GCOV_LINKAGE void gcov_write_string (const char *);
558
GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t);
559
GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/);
560
#endif
561
 
562
#if IN_GCOV > 0
563
/* Available in gcov */
564
GCOV_LINKAGE time_t gcov_time (void);
565
#endif
566
 
567
/* Save the current position in the gcov file.  */
568
 
569
static inline gcov_position_t
570
gcov_position (void)
571
{
572
  gcc_assert (gcov_var.mode > 0);
573
  return gcov_var.start + gcov_var.offset;
574
}
575
 
576
/* Return nonzero if the error flag is set.  */
577
 
578
static inline int
579
gcov_is_error (void)
580
{
581
  return gcov_var.file ? gcov_var.error : 1;
582
}
583
 
584
#if IN_LIBGCOV
585
/* Move to beginning of file and initialize for writing.  */
586
 
587
static inline void
588
gcov_rewrite (void)
589
{
590
  gcc_assert (gcov_var.mode > 0);
591
  gcov_var.mode = -1;
592
  gcov_var.start = 0;
593
  gcov_var.offset = 0;
594
  fseek (gcov_var.file, 0L, SEEK_SET);
595
}
596
#endif
597
 
598
#endif /* IN_LIBGCOV >= 0 */
599
 
600
#endif /* GCC_GCOV_IO_H */

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