330 lines
8.2 KiB
C
330 lines
8.2 KiB
C
/* Routines required for instrumenting a program. */
|
|
/* Compile this one with gcc. */
|
|
/* Copyright (C) 1989-2020 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);
|
|
FILE *f = get_gcov_error_file ();
|
|
ret = vfprintf (f, fmt, argp);
|
|
va_end (argp);
|
|
|
|
if (getenv ("GCOV_EXIT_AT_ERROR"))
|
|
{
|
|
fprintf (f, "profiling:exiting after an error\n");
|
|
exit (1);
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
/* Replace filename variables in FILENAME. We currently support expansion:
|
|
|
|
%p - process ID
|
|
%q{ENV} - value of environment variable ENV
|
|
*/
|
|
|
|
static char *
|
|
replace_filename_variables (char *filename)
|
|
{
|
|
char buffer[16];
|
|
char empty[] = "";
|
|
for (char *p = filename; *p != '\0'; p++)
|
|
{
|
|
unsigned length = strlen (filename);
|
|
if (*p == '%' && *(p + 1) != '\0')
|
|
{
|
|
unsigned start = p - filename;
|
|
p++;
|
|
char *replacement = NULL;
|
|
switch (*p)
|
|
{
|
|
case 'p':
|
|
sprintf (buffer, "%d", getpid ());
|
|
replacement = buffer;
|
|
p++;
|
|
break;
|
|
case 'q':
|
|
if (*(p + 1) == '{')
|
|
{
|
|
p += 2;
|
|
char *e = strchr (p, '}');
|
|
if (e)
|
|
{
|
|
*e = '\0';
|
|
replacement = getenv (p);
|
|
if (replacement == NULL)
|
|
replacement = empty;
|
|
p = e + 1;
|
|
}
|
|
else
|
|
return filename;
|
|
}
|
|
break;
|
|
default:
|
|
return filename;
|
|
}
|
|
|
|
/* Concat beginning of the path, replacement and
|
|
ending of the path. */
|
|
unsigned end = length - (p - filename);
|
|
unsigned repl_length = replacement != NULL ? strlen (replacement) : 0;
|
|
|
|
char *buffer = (char *)xmalloc (start + end + repl_length + 1);
|
|
char *buffer_ptr = buffer;
|
|
buffer_ptr = (char *)memcpy (buffer_ptr, filename, start);
|
|
buffer_ptr += start;
|
|
if (replacement != NULL)
|
|
buffer_ptr = (char *)memcpy (buffer_ptr, replacement, repl_length);
|
|
buffer_ptr += repl_length;
|
|
buffer_ptr = (char *)memcpy (buffer_ptr, p, end);
|
|
buffer_ptr += end;
|
|
*buffer_ptr = '\0';
|
|
|
|
free (filename);
|
|
filename = buffer;
|
|
p = buffer + start + repl_length;
|
|
}
|
|
}
|
|
|
|
return filename;
|
|
}
|
|
|
|
static void
|
|
allocate_filename_struct (struct gcov_filename *gf)
|
|
{
|
|
const char *gcov_prefix;
|
|
size_t prefix_length;
|
|
int strip = 0;
|
|
gf->filename = NULL;
|
|
|
|
{
|
|
/* 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;
|
|
}
|
|
|
|
/* Allocate and initialize the filename scratch space. */
|
|
if (prefix_length)
|
|
{
|
|
gf->prefix = (char *) xmalloc (prefix_length + 1);
|
|
char *p = (char *) memcpy (gf->prefix, gcov_prefix, prefix_length);
|
|
*(p + prefix_length) = '\0';
|
|
}
|
|
else
|
|
gf->prefix = NULL;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
int append_slash = 0;
|
|
const char *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))
|
|
append_slash = 1;
|
|
}
|
|
|
|
size_t prefix_length = gf->prefix ? strlen (gf->prefix) : 0;
|
|
gf->filename = (char *) xmalloc (prefix_length + strlen (fname) + 2);
|
|
*gf->filename = '\0';
|
|
if (prefix_length)
|
|
strcat (gf->filename, gf->prefix);
|
|
if (append_slash)
|
|
*gf->filename++ = '/';
|
|
strcat (gf->filename, fname);
|
|
|
|
gf->filename = replace_filename_variables (gf->filename);
|
|
|
|
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;
|
|
}
|