blob: ac60f9baf47e1c5d81196b7c732f6b83c10cc602 [file] [log] [blame]
/* File format for coverage information
Copyright (C) 1996-2020 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 3, 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* 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
/* Optimum number of gcov_unsigned_t's read from or written to disk. */
#define GCOV_BLOCK_SIZE (1 << 10)
struct gcov_var
{
FILE *file;
gcov_position_t start; /* Position of first byte of block */
unsigned offset; /* Read/write position within the block. */
unsigned length; /* Read limit in the block. */
unsigned overread; /* Number of words overread. */
int error; /* < 0 overflow, > 0 disk error. */
int mode; /* < 0 writing, > 0 reading */
int endian; /* Swap endianness. */
#if IN_LIBGCOV
/* Holds one block plus 4 bytes, thus all coverage reads & writes
fit within this buffer and we always can transfer GCOV_BLOCK_SIZE
to and from the disk. libgcov never backtracks and only writes 4
or 8 byte objects. */
gcov_unsigned_t buffer[GCOV_BLOCK_SIZE + 1];
#else
/* Holds a variable length block, as the compiler can write
strings and needs to backtrack. */
size_t alloc;
gcov_unsigned_t *buffer;
#endif
} gcov_var;
/* Save the current position in the gcov file. */
/* We need to expose this function when compiling for gcov-tool. */
#ifndef IN_GCOV_TOOL
static inline
#endif
gcov_position_t
gcov_position (void)
{
gcov_nonruntime_assert (gcov_var.mode > 0);
return gcov_var.start + gcov_var.offset;
}
/* Return nonzero if the error flag is set. */
/* We need to expose this function when compiling for gcov-tool. */
#ifndef IN_GCOV_TOOL
static inline
#endif
int
gcov_is_error (void)
{
return gcov_var.file ? gcov_var.error : 1;
}
#if IN_LIBGCOV
/* Move to beginning of file and initialize for writing. */
GCOV_LINKAGE inline void
gcov_rewrite (void)
{
gcov_var.mode = -1;
gcov_var.start = 0;
gcov_var.offset = 0;
fseek (gcov_var.file, 0L, SEEK_SET);
}
#endif
static inline gcov_unsigned_t from_file (gcov_unsigned_t value)
{
#if !IN_LIBGCOV || defined (IN_GCOV_TOOL)
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. 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. If MODE > 0, the file will be opened in
read-only mode. Otherwise it will be opened for modification.
Return zero on failure, non-zero on success. */
GCOV_LINKAGE int
#if IN_LIBGCOV
gcov_open (const char *name)
#else
gcov_open (const char *name, int mode)
#endif
{
#if IN_LIBGCOV
int mode = 0;
#endif
#if GCOV_LOCKED
struct flock s_flock;
int fd;
s_flock.l_whence = SEEK_SET;
s_flock.l_start = 0;
s_flock.l_len = 0; /* Until EOF. */
s_flock.l_pid = getpid ();
#endif
gcov_nonruntime_assert (!gcov_var.file);
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)
{
/* Read-only mode - acquire a read-lock. */
s_flock.l_type = F_RDLCK;
/* pass mode (ignored) for compatibility */
fd = open (name, O_RDONLY, S_IRUSR | S_IWUSR);
}
else
{
/* Write mode - acquire a write-lock. */
s_flock.l_type = F_WRLCK;
/* Truncate if force new mode. */
fd = open (name, O_RDWR | O_CREAT | (mode < 0 ? O_TRUNC : 0), 0666);
}
if (fd < 0)
return 0;
while (fcntl (fd, F_SETLKW, &s_flock) && errno == EINTR)
continue;
gcov_var.file = fdopen (fd, (mode > 0) ? "rb" : "r+b");
if (!gcov_var.file)
{
close (fd);
return 0;
}
#else
if (mode >= 0)
/* Open an existing file. */
gcov_var.file = fopen (name, (mode > 0) ? "rb" : "r+b");
if (gcov_var.file)
mode = 1;
else if (mode <= 0)
/* Create a new file. */
gcov_var.file = fopen (name, "w+b");
if (!gcov_var.file)
return 0;
#endif
gcov_var.mode = mode ? mode : 1;
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 || defined (IN_GCOV_TOOL)
/* 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 = XRESIZEVAR (gcov_unsigned_t, 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_nonruntime_assert (gcov_var.mode < 0);
#if IN_LIBGCOV
if (gcov_var.offset >= GCOV_BLOCK_SIZE)
{
gcov_write_block (GCOV_BLOCK_SIZE);
if (gcov_var.offset)
{
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;
}
#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;
if (alloc > 0)
{
buffer[alloc] = 0; /* place nul terminators. */
memcpy (&buffer[1], string, length);
}
}
#endif
#if !IN_LIBGCOV
/* Write FILENAME to coverage file. Sets error flag on file
error, overflow flag on overflow */
GCOV_LINKAGE void
gcov_write_filename (const char *filename)
{
if (profile_abs_path_flag && filename && filename[0]
&& !(IS_DIR_SEPARATOR (filename[0])
#if HAVE_DOS_BASED_FILE_SYSTEM
|| filename[1] == ':'
#endif
))
{
char *buf = getcwd (NULL, 0);
if (buf != NULL && buf[0])
{
size_t len = strlen (buf);
buf = (char*)xrealloc (buf, len + strlen (filename) + 2);
if (!IS_DIR_SEPARATOR (buf[len - 1]))
strcat (buf, "/");
strcat (buf, filename);
gcov_write_string (buf);
free (buf);
return;
}
}
gcov_write_string (filename);
}
#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_nonruntime_assert (gcov_var.mode < 0);
gcov_nonruntime_assert (position + 2 <= gcov_var.start + gcov_var.offset);
gcov_nonruntime_assert (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)
{
gcov_write_tag_length (tag, GCOV_TAG_SUMMARY_LENGTH);
gcov_write_unsigned (summary->runs);
gcov_write_unsigned (summary->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;
if (gcov_var.mode <= 0)
return NULL;
if (excess < words)
{
gcov_var.start += gcov_var.offset;
if (excess)
{
#if IN_LIBGCOV
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
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;
return value;
}
/* Mangle filename path of BASE and output new allocated pointer with
mangled path. */
char *
mangle_path (char const *base)
{
/* Convert '/' to '#', convert '..' to '^',
convert ':' to '~' on DOS based file system. */
const char *probe;
char *buffer = (char *)xmalloc (strlen (base) + 1);
char *ptr = buffer;
#if HAVE_DOS_BASED_FILE_SYSTEM
if (base[0] && base[1] == ':')
{
ptr[0] = base[0];
ptr[1] = '~';
ptr += 2;
base += 2;
}
#endif
for (; *base; base = probe)
{
size_t len;
for (probe = base; *probe; probe++)
if (*probe == '/')
break;
len = probe - base;
if (len == 2 && base[0] == '.' && base[1] == '.')
*ptr++ = '^';
else
{
memcpy (ptr, base, len);
ptr += len;
}
if (*probe)
{
*ptr++ = '#';
probe++;
}
}
/* Terminate the string. */
*ptr = '\0';
return buffer;
}
/* We need to expose the below function when compiling for gcov-tool. */
#if !IN_LIBGCOV || defined (IN_GCOV_TOOL)
/* 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. */
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)
{
summary->runs = gcov_read_unsigned ();
summary->sum_max = gcov_read_unsigned ();
}
/* We need to expose the below function when compiling for gcov-tool. */
#if !IN_LIBGCOV || defined (IN_GCOV_TOOL)
/* 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_nonruntime_assert (gcov_var.mode > 0);
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 a given position in a gcov file. */
GCOV_LINKAGE void
gcov_seek (gcov_position_t base)
{
if (gcov_var.offset)
gcov_write_block (gcov_var.offset);
fseek (gcov_var.file, base << 2, SEEK_SET);
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 */