freebsd-dev/contrib/gcc/gcov-io.c
2004-07-28 03:11:36 +00:00

545 lines
13 KiB
C

/* File format for coverage information
Copyright (C) 1996, 1997, 1998, 2000, 2002,
2003 Free Software Foundation, Inc.
Contributed by Bob Manson <manson@cygnus.com>.
Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
/* Routines declared in gcov-io.h. This file should be #included by
another source file, after having #included gcov-io.h. */
#if !IN_GCOV
static void gcov_write_block (unsigned);
static gcov_unsigned_t *gcov_write_words (unsigned);
#endif
static const gcov_unsigned_t *gcov_read_words (unsigned);
#if !IN_LIBGCOV
static void gcov_allocate (unsigned);
#endif
static inline gcov_unsigned_t from_file (gcov_unsigned_t value)
{
#if !IN_LIBGCOV
if (gcov_var.endian)
{
value = (value >> 16) | (value << 16);
value = ((value & 0xff00ff) << 8) | ((value >> 8) & 0xff00ff);
}
#endif
return value;
}
/* Open a gcov file. NAME is the name of the file to open and MODE
indicates whether a new file should be created, or an existing file
opened for modification. If MODE is >= 0 an existing file will be
opened, if possible, and if MODE is <= 0, a new file will be
created. Use MODE=0 to attempt to reopen an existing file and then
fall back on creating a new one. Return zero on failure, >0 on
opening an existing file and <0 on creating a new one. */
GCOV_LINKAGE int
#if IN_LIBGCOV
gcov_open (const char *name)
#else
gcov_open (const char *name, int mode)
#endif
{
#if IN_LIBGCOV
const int mode = 0;
#endif
#if GCOV_LOCKED
struct flock s_flock;
int fd;
s_flock.l_type = F_WRLCK;
s_flock.l_whence = SEEK_SET;
s_flock.l_start = 0;
s_flock.l_len = 0; /* Until EOF. */
s_flock.l_pid = getpid ();
#endif
if (gcov_var.file)
abort ();
gcov_var.start = 0;
gcov_var.offset = gcov_var.length = 0;
gcov_var.overread = -1u;
gcov_var.error = 0;
#if !IN_LIBGCOV
gcov_var.endian = 0;
#endif
#if GCOV_LOCKED
if (mode > 0)
fd = open (name, O_RDWR);
else
fd = open (name, O_RDWR | O_CREAT, 0666);
if (fd < 0)
return 0;
while (fcntl (fd, F_SETLKW, &s_flock) && errno == EINTR)
continue;
gcov_var.file = fdopen (fd, "r+b");
if (!gcov_var.file)
{
close (fd);
return 0;
}
if (mode > 0)
gcov_var.mode = 1;
else if (mode == 0)
{
struct stat st;
if (fstat (fd, &st) < 0)
{
fclose (gcov_var.file);
gcov_var.file = 0;
return 0;
}
if (st.st_size != 0)
gcov_var.mode = 1;
else
gcov_var.mode = mode * 2 + 1;
}
else
gcov_var.mode = mode * 2 + 1;
#else
if (mode >= 0)
gcov_var.file = fopen (name, "r+b");
if (gcov_var.file)
gcov_var.mode = 1;
else if (mode <= 0)
{
gcov_var.file = fopen (name, "w+b");
if (gcov_var.file)
gcov_var.mode = mode * 2 + 1;
}
if (!gcov_var.file)
return 0;
#endif
setbuf (gcov_var.file, (char *)0);
return 1;
}
/* Close the current gcov file. Flushes data to disk. Returns nonzero
on failure or error flag set. */
GCOV_LINKAGE int
gcov_close (void)
{
if (gcov_var.file)
{
#if !IN_GCOV
if (gcov_var.offset && gcov_var.mode < 0)
gcov_write_block (gcov_var.offset);
#endif
fclose (gcov_var.file);
gcov_var.file = 0;
gcov_var.length = 0;
}
#if !IN_LIBGCOV
free (gcov_var.buffer);
gcov_var.alloc = 0;
gcov_var.buffer = 0;
#endif
gcov_var.mode = 0;
return gcov_var.error;
}
#if !IN_LIBGCOV
/* Check if MAGIC is EXPECTED. Use it to determine endianness of the
file. Returns +1 for same endian, -1 for other endian and zero for
not EXPECTED. */
GCOV_LINKAGE int
gcov_magic (gcov_unsigned_t magic, gcov_unsigned_t expected)
{
if (magic == expected)
return 1;
magic = (magic >> 16) | (magic << 16);
magic = ((magic & 0xff00ff) << 8) | ((magic >> 8) & 0xff00ff);
if (magic == expected)
{
gcov_var.endian = 1;
return -1;
}
return 0;
}
#endif
#if !IN_LIBGCOV
static void
gcov_allocate (unsigned length)
{
size_t new_size = gcov_var.alloc;
if (!new_size)
new_size = GCOV_BLOCK_SIZE;
new_size += length;
new_size *= 2;
gcov_var.alloc = new_size;
gcov_var.buffer = xrealloc (gcov_var.buffer, new_size << 2);
}
#endif
#if !IN_GCOV
/* Write out the current block, if needs be. */
static void
gcov_write_block (unsigned size)
{
if (fwrite (gcov_var.buffer, size << 2, 1, gcov_var.file) != 1)
gcov_var.error = 1;
gcov_var.start += size;
gcov_var.offset -= size;
}
/* Allocate space to write BYTES bytes to the gcov file. Return a
pointer to those bytes, or NULL on failure. */
static gcov_unsigned_t *
gcov_write_words (unsigned words)
{
gcov_unsigned_t *result;
GCOV_CHECK_WRITING ();
#if IN_LIBGCOV
if (gcov_var.offset >= GCOV_BLOCK_SIZE)
{
gcov_write_block (GCOV_BLOCK_SIZE);
if (gcov_var.offset)
{
GCOV_CHECK (gcov_var.offset == 1);
memcpy (gcov_var.buffer, gcov_var.buffer + GCOV_BLOCK_SIZE, 4);
}
}
#else
if (gcov_var.offset + words > gcov_var.alloc)
gcov_allocate (gcov_var.offset + words);
#endif
result = &gcov_var.buffer[gcov_var.offset];
gcov_var.offset += words;
return result;
}
/* Write unsigned VALUE to coverage file. Sets error flag
appropriately. */
GCOV_LINKAGE void
gcov_write_unsigned (gcov_unsigned_t value)
{
gcov_unsigned_t *buffer = gcov_write_words (1);
buffer[0] = value;
}
/* Write counter VALUE to coverage file. Sets error flag
appropriately. */
#if IN_LIBGCOV
GCOV_LINKAGE void
gcov_write_counter (gcov_type value)
{
gcov_unsigned_t *buffer = gcov_write_words (2);
buffer[0] = (gcov_unsigned_t) value;
if (sizeof (value) > sizeof (gcov_unsigned_t))
buffer[1] = (gcov_unsigned_t) (value >> 32);
else
buffer[1] = 0;
if (value < 0)
gcov_var.error = -1;
}
#endif /* IN_LIBGCOV */
#if !IN_LIBGCOV
/* Write STRING to coverage file. Sets error flag on file
error, overflow flag on overflow */
GCOV_LINKAGE void
gcov_write_string (const char *string)
{
unsigned length = 0;
unsigned alloc = 0;
gcov_unsigned_t *buffer;
if (string)
{
length = strlen (string);
alloc = (length + 4) >> 2;
}
buffer = gcov_write_words (1 + alloc);
buffer[0] = alloc;
buffer[alloc] = 0;
memcpy (&buffer[1], string, length);
}
#endif
#if !IN_LIBGCOV
/* Write a tag TAG and reserve space for the record length. Return a
value to be used for gcov_write_length. */
GCOV_LINKAGE gcov_position_t
gcov_write_tag (gcov_unsigned_t tag)
{
gcov_position_t result = gcov_var.start + gcov_var.offset;
gcov_unsigned_t *buffer = gcov_write_words (2);
buffer[0] = tag;
buffer[1] = 0;
return result;
}
/* Write a record length using POSITION, which was returned by
gcov_write_tag. The current file position is the end of the
record, and is restored before returning. Returns nonzero on
overflow. */
GCOV_LINKAGE void
gcov_write_length (gcov_position_t position)
{
unsigned offset;
gcov_unsigned_t length;
gcov_unsigned_t *buffer;
GCOV_CHECK_WRITING ();
GCOV_CHECK (position + 2 <= gcov_var.start + gcov_var.offset);
GCOV_CHECK (position >= gcov_var.start);
offset = position - gcov_var.start;
length = gcov_var.offset - offset - 2;
buffer = (gcov_unsigned_t *) &gcov_var.buffer[offset];
buffer[1] = length;
if (gcov_var.offset >= GCOV_BLOCK_SIZE)
gcov_write_block (gcov_var.offset);
}
#else /* IN_LIBGCOV */
/* Write a tag TAG and length LENGTH. */
GCOV_LINKAGE void
gcov_write_tag_length (gcov_unsigned_t tag, gcov_unsigned_t length)
{
gcov_unsigned_t *buffer = gcov_write_words (2);
buffer[0] = tag;
buffer[1] = length;
}
/* Write a summary structure to the gcov file. Return nonzero on
overflow. */
GCOV_LINKAGE void
gcov_write_summary (gcov_unsigned_t tag, const struct gcov_summary *summary)
{
unsigned ix;
const struct gcov_ctr_summary *csum;
gcov_write_tag_length (tag, GCOV_TAG_SUMMARY_LENGTH);
gcov_write_unsigned (summary->checksum);
for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)
{
gcov_write_unsigned (csum->num);
gcov_write_unsigned (csum->runs);
gcov_write_counter (csum->sum_all);
gcov_write_counter (csum->run_max);
gcov_write_counter (csum->sum_max);
}
}
#endif /* IN_LIBGCOV */
#endif /*!IN_GCOV */
/* Return a pointer to read BYTES bytes from the gcov file. Returns
NULL on failure (read past EOF). */
static const gcov_unsigned_t *
gcov_read_words (unsigned words)
{
const gcov_unsigned_t *result;
unsigned excess = gcov_var.length - gcov_var.offset;
GCOV_CHECK_READING ();
if (excess < words)
{
gcov_var.start += gcov_var.offset;
#if IN_LIBGCOV
if (excess)
{
GCOV_CHECK (excess == 1);
memcpy (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, 4);
}
#else
memmove (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, excess * 4);
#endif
gcov_var.offset = 0;
gcov_var.length = excess;
#if IN_LIBGCOV
GCOV_CHECK (!gcov_var.length || gcov_var.length == 1);
excess = GCOV_BLOCK_SIZE;
#else
if (gcov_var.length + words > gcov_var.alloc)
gcov_allocate (gcov_var.length + words);
excess = gcov_var.alloc - gcov_var.length;
#endif
excess = fread (gcov_var.buffer + gcov_var.length,
1, excess << 2, gcov_var.file) >> 2;
gcov_var.length += excess;
if (gcov_var.length < words)
{
gcov_var.overread += words - gcov_var.length;
gcov_var.length = 0;
return 0;
}
}
result = &gcov_var.buffer[gcov_var.offset];
gcov_var.offset += words;
return result;
}
/* Read unsigned value from a coverage file. Sets error flag on file
error, overflow flag on overflow */
GCOV_LINKAGE gcov_unsigned_t
gcov_read_unsigned (void)
{
gcov_unsigned_t value;
const gcov_unsigned_t *buffer = gcov_read_words (1);
if (!buffer)
return 0;
value = from_file (buffer[0]);
return value;
}
/* Read counter value from a coverage file. Sets error flag on file
error, overflow flag on overflow */
GCOV_LINKAGE gcov_type
gcov_read_counter (void)
{
gcov_type value;
const gcov_unsigned_t *buffer = gcov_read_words (2);
if (!buffer)
return 0;
value = from_file (buffer[0]);
if (sizeof (value) > sizeof (gcov_unsigned_t))
value |= ((gcov_type) from_file (buffer[1])) << 32;
else if (buffer[1])
gcov_var.error = -1;
if (value < 0)
gcov_var.error = -1;
return value;
}
/* Read string from coverage file. Returns a pointer to a static
buffer, or NULL on empty string. You must copy the string before
calling another gcov function. */
#if !IN_LIBGCOV
GCOV_LINKAGE const char *
gcov_read_string (void)
{
unsigned length = gcov_read_unsigned ();
if (!length)
return 0;
return (const char *) gcov_read_words (length);
}
#endif
GCOV_LINKAGE void
gcov_read_summary (struct gcov_summary *summary)
{
unsigned ix;
struct gcov_ctr_summary *csum;
summary->checksum = gcov_read_unsigned ();
for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)
{
csum->num = gcov_read_unsigned ();
csum->runs = gcov_read_unsigned ();
csum->sum_all = gcov_read_counter ();
csum->run_max = gcov_read_counter ();
csum->sum_max = gcov_read_counter ();
}
}
#if !IN_LIBGCOV
/* Reset to a known position. BASE should have been obtained from
gcov_position, LENGTH should be a record length. */
GCOV_LINKAGE void
gcov_sync (gcov_position_t base, gcov_unsigned_t length)
{
GCOV_CHECK_READING ();
base += length;
if (base - gcov_var.start <= gcov_var.length)
gcov_var.offset = base - gcov_var.start;
else
{
gcov_var.offset = gcov_var.length = 0;
fseek (gcov_var.file, base << 2, SEEK_SET);
gcov_var.start = ftell (gcov_var.file) >> 2;
}
}
#endif
#if IN_LIBGCOV
/* Move to the a set position in a gcov file. BASE is zero to move to
the end, and nonzero to move to that position. */
GCOV_LINKAGE void
gcov_seek (gcov_position_t base)
{
GCOV_CHECK_WRITING ();
if (gcov_var.offset)
gcov_write_block (gcov_var.offset);
fseek (gcov_var.file, base << 2, base ? SEEK_SET : SEEK_END);
gcov_var.start = ftell (gcov_var.file) >> 2;
}
#endif
#if IN_GCOV > 0
/* Return the modification time of the current gcov file. */
GCOV_LINKAGE time_t
gcov_time (void)
{
struct stat status;
if (fstat (fileno (gcov_var.file), &status))
return 0;
else
return status.st_mtime;
}
#endif /* IN_GCOV */