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