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/* Routines required for instrumenting a program. */
/* Compile this one with gcc. */
/* Copyright (C) 1989-2017 Free Software Foundation, Inc.
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/>. */
#if !IN_GCOV_TOOL
/* Configured via the GCOV_ERROR_FILE environment variable;
it will either be stderr, or a file of the user's choosing.
Non-static to prevent multiple gcov-aware shared objects from
instantiating their own copies. */
FILE *__gcov_error_file = NULL;
#endif
/* A utility function to populate the __gcov_error_file pointer.
This should NOT be called outside of the gcov system driver code. */
static FILE *
get_gcov_error_file (void)
{
#if IN_GCOV_TOOL
return stderr;
#else
if (!__gcov_error_file)
{
const char *gcov_error_filename = getenv ("GCOV_ERROR_FILE");
if (gcov_error_filename)
__gcov_error_file = fopen (gcov_error_filename, "a");
if (!__gcov_error_file)
__gcov_error_file = stderr;
}
return __gcov_error_file;
#endif
}
/* A utility function for outputting errors. */
static int __attribute__((format(printf, 1, 2)))
gcov_error (const char *fmt, ...)
{
int ret;
va_list argp;
va_start (argp, fmt);
ret = vfprintf (get_gcov_error_file (), fmt, argp);
va_end (argp);
return ret;
}
#if !IN_GCOV_TOOL
static void
gcov_error_exit (void)
{
if (__gcov_error_file && __gcov_error_file != stderr)
{
fclose (__gcov_error_file);
__gcov_error_file = NULL;
}
}
#endif
/* Make sure path component of the given FILENAME exists, create
missing directories. FILENAME must be writable.
Returns zero on success, or -1 if an error occurred. */
static int
create_file_directory (char *filename)
{
#if !defined(TARGET_POSIX_IO) && !defined(_WIN32)
(void) filename;
return -1;
#else
char *s;
s = filename;
if (HAS_DRIVE_SPEC(s))
s += 2;
if (IS_DIR_SEPARATOR(*s))
++s;
for (; *s != '\0'; s++)
if (IS_DIR_SEPARATOR(*s))
{
char sep = *s;
*s = '\0';
/* Try to make directory if it doesn't already exist. */
if (access (filename, F_OK) == -1
#ifdef TARGET_POSIX_IO
&& mkdir (filename, 0755) == -1
#else
#ifdef mkdir
#undef mkdir
#endif
&& mkdir (filename) == -1
#endif
/* The directory might have been made by another process. */
&& errno != EEXIST)
{
gcov_error ("profiling:%s:Cannot create directory\n", filename);
*s = sep;
return -1;
};
*s = sep;
};
return 0;
#endif
}
static void
allocate_filename_struct (struct gcov_filename *gf)
{
const char *gcov_prefix;
size_t prefix_length;
int strip = 0;
{
/* Check if the level of dirs to strip off specified. */
char *tmp = getenv("GCOV_PREFIX_STRIP");
if (tmp)
{
strip = atoi (tmp);
/* Do not consider negative values. */
if (strip < 0)
strip = 0;
}
}
gf->strip = strip;
/* Get file name relocation prefix. Non-absolute values are ignored. */
gcov_prefix = getenv("GCOV_PREFIX");
prefix_length = gcov_prefix ? strlen (gcov_prefix) : 0;
/* Remove an unnecessary trailing '/' */
if (prefix_length && IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1]))
prefix_length--;
/* If no prefix was specified and a prefix stip, then we assume
relative. */
if (!prefix_length && gf->strip)
{
gcov_prefix = ".";
prefix_length = 1;
}
gf->prefix = prefix_length;
/* Allocate and initialize the filename scratch space. */
gf->filename = (char *) xmalloc (gf->max_length + prefix_length + 2);
if (prefix_length)
memcpy (gf->filename, gcov_prefix, prefix_length);
}
/* Open a gcda file specified by GI_FILENAME.
Return -1 on error. Return 0 on success. */
static int
gcov_exit_open_gcda_file (struct gcov_info *gi_ptr,
struct gcov_filename *gf)
{
const char *fname = gi_ptr->filename;
char *dst = gf->filename + gf->prefix;
fname = gi_ptr->filename;
/* Build relocated filename, stripping off leading
directories from the initial filename if requested. */
if (gf->strip > 0)
{
const char *probe = fname;
int level;
/* Remove a leading separator, without counting it. */
if (IS_DIR_SEPARATOR (*probe))
probe++;
/* Skip selected directory levels. If we fall off the end, we
keep the final part. */
for (level = gf->strip; *probe && level; probe++)
if (IS_DIR_SEPARATOR (*probe))
{
fname = probe;
level--;
}
}
/* Update complete filename with stripped original. */
if (gf->prefix)
{
/* Avoid to add multiple drive letters into combined path. */
if (HAS_DRIVE_SPEC(fname))
fname += 2;
if (!IS_DIR_SEPARATOR (*fname))
*dst++ = '/';
}
strcpy (dst, fname);
if (!gcov_open (gf->filename))
{
/* Open failed likely due to missed directory.
Create directory and retry to open file. */
if (create_file_directory (gf->filename))
{
fprintf (stderr, "profiling:%s:Skip\n", gf->filename);
return -1;
}
if (!gcov_open (gf->filename))
{
fprintf (stderr, "profiling:%s:Cannot open\n", gf->filename);
return -1;
}
}
return 0;
}
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