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1 684 jeremybenn
/* File format for coverage information
2
   Copyright (C) 1996, 1997, 1998, 2000, 2002,
3
   2003, 2004, 2005, 2008, 2009 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 3, 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
Under Section 7 of GPL version 3, you are granted additional
20
permissions described in the GCC Runtime Library Exception, version
21
3.1, as published by the Free Software Foundation.
22
 
23
You should have received a copy of the GNU General Public License and
24
a copy of the GCC Runtime Library Exception along with this program;
25
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
26
<http://www.gnu.org/licenses/>.  */
27
 
28
 
29
/* Coverage information is held in two files.  A notes file, which is
30
   generated by the compiler, and a data file, which is generated by
31
   the program under test.  Both files use a similar structure.  We do
32
   not attempt to make these files backwards compatible with previous
33
   versions, as you only need coverage information when developing a
34
   program.  We do hold version information, so that mismatches can be
35
   detected, and we use a format that allows tools to skip information
36
   they do not understand or are not interested in.
37
 
38
   Numbers are recorded in the 32 bit unsigned binary form of the
39
   endianness of the machine generating the file. 64 bit numbers are
40
   stored as two 32 bit numbers, the low part first.  Strings are
41
   padded with 1 to 4 NUL bytes, to bring the length up to a multiple
42
   of 4. The number of 4 bytes is stored, followed by the padded
43
   string. Zero length and NULL strings are simply stored as a length
44
   of zero (they have no trailing NUL or padding).
45
 
46
        int32:  byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3
47
        int64:  int32:low int32:high
48
        string: int32:0 | int32:length char* char:0 padding
49
        padding: | char:0 | char:0 char:0 | char:0 char:0 char:0
50
        item: int32 | int64 | string
51
 
52
   The basic format of the files is
53
 
54
        file : int32:magic int32:version int32:stamp record*
55
 
56
   The magic ident is different for the notes and the data files.  The
57
   magic ident is used to determine the endianness of the file, when
58
   reading.  The version is the same for both files and is derived
59
   from gcc's version number. The stamp value is used to synchronize
60
   note and data files and to synchronize merging within a data
61
   file. It need not be an absolute time stamp, merely a ticker that
62
   increments fast enough and cycles slow enough to distinguish
63
   different compile/run/compile cycles.
64
 
65
   Although the ident and version are formally 32 bit numbers, they
66
   are derived from 4 character ASCII strings.  The version number
67
   consists of the single character major version number, a two
68
   character minor version number (leading zero for versions less than
69
   10), and a single character indicating the status of the release.
70
   That will be 'e' experimental, 'p' prerelease and 'r' for release.
71
   Because, by good fortune, these are in alphabetical order, string
72
   collating can be used to compare version strings.  Be aware that
73
   the 'e' designation will (naturally) be unstable and might be
74
   incompatible with itself.  For gcc 3.4 experimental, it would be
75
   '304e' (0x33303465).  When the major version reaches 10, the
76
   letters A-Z will be used.  Assuming minor increments releases every
77
   6 months, we have to make a major increment every 50 years.
78
   Assuming major increments releases every 5 years, we're ok for the
79
   next 155 years -- good enough for me.
80
 
81
   A record has a tag, length and variable amount of data.
82
 
83
        record: header data
84
        header: int32:tag int32:length
85
        data: item*
86
 
87
   Records are not nested, but there is a record hierarchy.  Tag
88
   numbers reflect this hierarchy.  Tags are unique across note and
89
   data files.  Some record types have a varying amount of data.  The
90
   LENGTH is the number of 4bytes that follow and is usually used to
91
   determine how much data.  The tag value is split into 4 8-bit
92
   fields, one for each of four possible levels.  The most significant
93
   is allocated first.  Unused levels are zero.  Active levels are
94
   odd-valued, so that the LSB of the level is one.  A sub-level
95
   incorporates the values of its superlevels.  This formatting allows
96
   you to determine the tag hierarchy, without understanding the tags
97
   themselves, and is similar to the standard section numbering used
98
   in technical documents.  Level values [1..3f] are used for common
99
   tags, values [41..9f] for the notes file and [a1..ff] for the data
100
   file.
101
 
102
   The basic block graph file contains the following records
103
        note: unit function-graph*
104
        unit: header int32:checksum string:source
105
        function-graph: announce_function basic_blocks {arcs | lines}*
106
        announce_function: header int32:ident
107
                int32:lineno_checksum int32:cfg_checksum
108
                string:name string:source int32:lineno
109
        basic_block: header int32:flags*
110
        arcs: header int32:block_no arc*
111
        arc:  int32:dest_block int32:flags
112
        lines: header int32:block_no line*
113
               int32:0 string:NULL
114
        line:  int32:line_no | int32:0 string:filename
115
 
116
   The BASIC_BLOCK record holds per-bb flags.  The number of blocks
117
   can be inferred from its data length.  There is one ARCS record per
118
   basic block.  The number of arcs from a bb is implicit from the
119
   data length.  It enumerates the destination bb and per-arc flags.
120
   There is one LINES record per basic block, it enumerates the source
121
   lines which belong to that basic block.  Source file names are
122
   introduced by a line number of 0, following lines are from the new
123
   source file.  The initial source file for the function is NULL, but
124
   the current source file should be remembered from one LINES record
125
   to the next.  The end of a block is indicated by an empty filename
126
   - this does not reset the current source file.  Note there is no
127
   ordering of the ARCS and LINES records: they may be in any order,
128
   interleaved in any manner.  The current filename follows the order
129
   the LINES records are stored in the file, *not* the ordering of the
130
   blocks they are for.
131
 
132
   The data file contains the following records.
133
        data: {unit summary:object summary:program* function-data*}*
134
        unit: header int32:checksum
135
        function-data:  announce_function present counts
136
        announce_function: header int32:ident
137
                int32:lineno_checksum int32:cfg_checksum
138
        present: header int32:present
139
        counts: header int64:count*
140
        summary: int32:checksum {count-summary}GCOV_COUNTERS_SUMMABLE
141
        count-summary:  int32:num int32:runs int64:sum
142
                        int64:max int64:sum_max
143
 
144
   The ANNOUNCE_FUNCTION record is the same as that in the note file,
145
   but without the source location.  The COUNTS gives the
146
   counter values for instrumented features.  The 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
151
   zero.  Note that the data file might contain information from
152
   several runs 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 (3)
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) /* Obsolete */
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
 
331
#define GCOV_COUNTER_V_INDIR    5  /* The most common indirect address */
332
#define GCOV_COUNTER_AVERAGE    6  /* Compute average value passed to the
333
                                      counter.  */
334
#define GCOV_COUNTER_IOR        7  /* IOR of the all values passed to
335
                                      counter.  */
336
#define GCOV_LAST_VALUE_COUNTER 7  /* The last of counters used for value
337
                                      profiling.  */
338
#define GCOV_COUNTERS           8
339
 
340
/* Number of counters used for value profiling.  */
341
#define GCOV_N_VALUE_COUNTERS \
342
  (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1)
343
 
344
  /* A list of human readable names of the counters */
345
#define GCOV_COUNTER_NAMES      {"arcs", "interval", "pow2", "single", \
346
                                 "delta", "indirect_call", "average", "ior"}
347
 
348
  /* Names of merge functions for counters.  */
349
#define GCOV_MERGE_FUNCTIONS    {"__gcov_merge_add",    \
350
                                 "__gcov_merge_add",    \
351
                                 "__gcov_merge_add",    \
352
                                 "__gcov_merge_single", \
353
                                 "__gcov_merge_delta",  \
354
                                 "__gcov_merge_single", \
355
                                 "__gcov_merge_add",    \
356
                                 "__gcov_merge_ior"}
357
 
358
/* Convert a counter index to a tag.  */
359
#define GCOV_TAG_FOR_COUNTER(COUNT)                             \
360
        (GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17))
361
/* Convert a tag to a counter.  */
362
#define GCOV_COUNTER_FOR_TAG(TAG)                                       \
363
        ((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17))
364
/* Check whether a tag is a counter tag.  */
365
#define GCOV_TAG_IS_COUNTER(TAG)                                \
366
        (!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS)
367
 
368
/* The tag level mask has 1's in the position of the inner levels, &
369
   the lsb of the current level, and zero on the current and outer
370
   levels.  */
371
#define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG))
372
 
373
/* Return nonzero if SUB is an immediate subtag of TAG.  */
374
#define GCOV_TAG_IS_SUBTAG(TAG,SUB)                             \
375
        (GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB)        \
376
         && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK(TAG)))
377
 
378
/* Return nonzero if SUB is at a sublevel to TAG.  */
379
#define GCOV_TAG_IS_SUBLEVEL(TAG,SUB)                           \
380
        (GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB))
381
 
382
/* Basic block flags.  */
383
#define GCOV_BLOCK_UNEXPECTED   (1 << 1)
384
 
385
/* Arc flags.  */
386
#define GCOV_ARC_ON_TREE        (1 << 0)
387
#define GCOV_ARC_FAKE           (1 << 1)
388
#define GCOV_ARC_FALLTHROUGH    (1 << 2)
389
 
390
/* Structured records.  */
391
 
392
/* Cumulative counter data.  */
393
struct gcov_ctr_summary
394
{
395
  gcov_unsigned_t num;          /* number of counters.  */
396
  gcov_unsigned_t runs;         /* number of program runs */
397
  gcov_type sum_all;            /* sum of all counters accumulated.  */
398
  gcov_type run_max;            /* maximum value on a single run.  */
399
  gcov_type sum_max;            /* sum of individual run max values.  */
400
};
401
 
402
/* Object & program summary record.  */
403
struct gcov_summary
404
{
405
  gcov_unsigned_t checksum;     /* checksum of program */
406
  struct gcov_ctr_summary ctrs[GCOV_COUNTERS_SUMMABLE];
407
};
408
 
409
/* Structures embedded in coveraged program.  The structures generated
410
   by write_profile must match these.  */
411
 
412
#if IN_LIBGCOV
413
/* Information about counters for a single function.  */
414
struct gcov_ctr_info
415
{
416
  gcov_unsigned_t num;          /* number of counters.  */
417
  gcov_type *values;            /* their values.  */
418
};
419
 
420
/* Information about a single function.  This uses the trailing array
421
   idiom. The number of counters is determined from the merge pointer
422
   array in gcov_info.  The key is used to detect which of a set of
423
   comdat functions was selected -- it points to the gcov_info object
424
   of the object file containing the selected comdat function.  */
425
 
426
struct gcov_fn_info
427
{
428
  const struct gcov_info *key;          /* comdat key */
429
  gcov_unsigned_t ident;                /* unique ident of function */
430
  gcov_unsigned_t lineno_checksum;      /* function lineo_checksum */
431
  gcov_unsigned_t cfg_checksum;         /* function cfg checksum */
432
  struct gcov_ctr_info ctrs[0];          /* instrumented counters */
433
};
434
 
435
/* Type of function used to merge counters.  */
436
typedef void (*gcov_merge_fn) (gcov_type *, gcov_unsigned_t);
437
 
438
/* Information about a single object file.  */
439
struct gcov_info
440
{
441
  gcov_unsigned_t version;      /* expected version number */
442
  struct gcov_info *next;       /* link to next, used by libgcov */
443
 
444
  gcov_unsigned_t stamp;        /* uniquifying time stamp */
445
  const char *filename;         /* output file name */
446
 
447
  gcov_merge_fn merge[GCOV_COUNTERS];  /* merge functions (null for
448
                                          unused) */
449
 
450
  unsigned n_functions;         /* number of functions */
451
  const struct gcov_fn_info *const *functions; /* pointer to pointers
452
                                                  to function information  */
453
};
454
 
455
/* Register a new object file module.  */
456
extern void __gcov_init (struct gcov_info *) ATTRIBUTE_HIDDEN;
457
 
458
/* Called before fork, to avoid double counting.  */
459
extern void __gcov_flush (void) ATTRIBUTE_HIDDEN;
460
 
461
/* The merge function that just sums the counters.  */
462
extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
463
 
464
/* The merge function to choose the most common value.  */
465
extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
466
 
467
/* The merge function to choose the most common difference between
468
   consecutive values.  */
469
extern void __gcov_merge_delta (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
470
 
471
/* The merge function that just ors the counters together.  */
472
extern void __gcov_merge_ior (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
473
 
474
/* The profiler functions.  */
475
extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned);
476
extern void __gcov_pow2_profiler (gcov_type *, gcov_type);
477
extern void __gcov_one_value_profiler (gcov_type *, gcov_type);
478
extern void __gcov_indirect_call_profiler (gcov_type *, gcov_type, void *, void *);
479
extern void __gcov_average_profiler (gcov_type *, gcov_type);
480
extern void __gcov_ior_profiler (gcov_type *, gcov_type);
481
 
482
#ifndef inhibit_libc
483
/* The wrappers around some library functions..  */
484
extern pid_t __gcov_fork (void) ATTRIBUTE_HIDDEN;
485
extern int __gcov_execl (const char *, char *, ...) ATTRIBUTE_HIDDEN;
486
extern int __gcov_execlp (const char *, char *, ...) ATTRIBUTE_HIDDEN;
487
extern int __gcov_execle (const char *, char *, ...) ATTRIBUTE_HIDDEN;
488
extern int __gcov_execv (const char *, char *const []) ATTRIBUTE_HIDDEN;
489
extern int __gcov_execvp (const char *, char *const []) ATTRIBUTE_HIDDEN;
490
extern int __gcov_execve (const char *, char  *const [], char *const [])
491
  ATTRIBUTE_HIDDEN;
492
#endif
493
 
494
#endif /* IN_LIBGCOV */
495
 
496
#if IN_LIBGCOV >= 0
497
 
498
/* Optimum number of gcov_unsigned_t's read from or written to disk.  */
499
#define GCOV_BLOCK_SIZE (1 << 10)
500
 
501
GCOV_LINKAGE struct gcov_var
502
{
503
  FILE *file;
504
  gcov_position_t start;        /* Position of first byte of block */
505
  unsigned offset;              /* Read/write position within the block.  */
506
  unsigned length;              /* Read limit in the block.  */
507
  unsigned overread;            /* Number of words overread.  */
508
  int error;                    /* < 0 overflow, > 0 disk error.  */
509
  int mode;                     /* < 0 writing, > 0 reading */
510
#if IN_LIBGCOV
511
  /* Holds one block plus 4 bytes, thus all coverage reads & writes
512
     fit within this buffer and we always can transfer GCOV_BLOCK_SIZE
513
     to and from the disk. libgcov never backtracks and only writes 4
514
     or 8 byte objects.  */
515
  gcov_unsigned_t buffer[GCOV_BLOCK_SIZE + 1];
516
#else
517
  int endian;                   /* Swap endianness.  */
518
  /* Holds a variable length block, as the compiler can write
519
     strings and needs to backtrack.  */
520
  size_t alloc;
521
  gcov_unsigned_t *buffer;
522
#endif
523
} gcov_var ATTRIBUTE_HIDDEN;
524
 
525
/* Functions for reading and writing gcov files. In libgcov you can
526
   open the file for reading then writing. Elsewhere you can open the
527
   file either for reading or for writing. When reading a file you may
528
   use the gcov_read_* functions, gcov_sync, gcov_position, &
529
   gcov_error. When writing a file you may use the gcov_write
530
   functions, gcov_seek & gcov_error. When a file is to be rewritten
531
   you use the functions for reading, then gcov_rewrite then the
532
   functions for writing.  Your file may become corrupted if you break
533
   these invariants.  */
534
#if IN_LIBGCOV
535
GCOV_LINKAGE int gcov_open (const char */*name*/) ATTRIBUTE_HIDDEN;
536
#else
537
GCOV_LINKAGE int gcov_open (const char */*name*/, int /*direction*/);
538
GCOV_LINKAGE int gcov_magic (gcov_unsigned_t, gcov_unsigned_t);
539
#endif
540
GCOV_LINKAGE int gcov_close (void) ATTRIBUTE_HIDDEN;
541
 
542
/* Available everywhere.  */
543
static gcov_position_t gcov_position (void);
544
static int gcov_is_error (void);
545
 
546
GCOV_LINKAGE gcov_unsigned_t gcov_read_unsigned (void) ATTRIBUTE_HIDDEN;
547
GCOV_LINKAGE gcov_type gcov_read_counter (void) ATTRIBUTE_HIDDEN;
548
GCOV_LINKAGE void gcov_read_summary (struct gcov_summary *) ATTRIBUTE_HIDDEN;
549
 
550
#if IN_LIBGCOV
551
/* Available only in libgcov */
552
GCOV_LINKAGE void gcov_write_counter (gcov_type) ATTRIBUTE_HIDDEN;
553
GCOV_LINKAGE void gcov_write_tag_length (gcov_unsigned_t, gcov_unsigned_t)
554
    ATTRIBUTE_HIDDEN;
555
GCOV_LINKAGE void gcov_write_summary (gcov_unsigned_t /*tag*/,
556
                                      const struct gcov_summary *)
557
    ATTRIBUTE_HIDDEN;
558
static void gcov_rewrite (void);
559
GCOV_LINKAGE void gcov_seek (gcov_position_t /*position*/) ATTRIBUTE_HIDDEN;
560
#else
561
/* Available outside libgcov */
562
GCOV_LINKAGE const char *gcov_read_string (void);
563
GCOV_LINKAGE void gcov_sync (gcov_position_t /*base*/,
564
                             gcov_unsigned_t /*length */);
565
#endif
566
 
567
#if !IN_GCOV
568
/* Available outside gcov */
569
GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t) ATTRIBUTE_HIDDEN;
570
#endif
571
 
572
#if !IN_GCOV && !IN_LIBGCOV
573
/* Available only in compiler */
574
GCOV_LINKAGE void gcov_write_string (const char *);
575
GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t);
576
GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/);
577
#endif
578
 
579
#if IN_GCOV > 0
580
/* Available in gcov */
581
GCOV_LINKAGE time_t gcov_time (void);
582
#endif
583
 
584
/* Save the current position in the gcov file.  */
585
 
586
static inline gcov_position_t
587
gcov_position (void)
588
{
589
  gcc_assert (gcov_var.mode > 0);
590
  return gcov_var.start + gcov_var.offset;
591
}
592
 
593
/* Return nonzero if the error flag is set.  */
594
 
595
static inline int
596
gcov_is_error (void)
597
{
598
  return gcov_var.file ? gcov_var.error : 1;
599
}
600
 
601
#if IN_LIBGCOV
602
/* Move to beginning of file and initialize for writing.  */
603
 
604
static inline void
605
gcov_rewrite (void)
606
{
607
  gcc_assert (gcov_var.mode > 0);
608
  gcov_var.mode = -1;
609
  gcov_var.start = 0;
610
  gcov_var.offset = 0;
611
  fseek (gcov_var.file, 0L, SEEK_SET);
612
}
613
#endif
614
 
615
#endif /* IN_LIBGCOV >= 0 */
616
 
617
#endif /* GCC_GCOV_IO_H */

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