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330 lines
8.2 KiB
C
330 lines
8.2 KiB
C
/* Routines required for instrumenting a program. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1989-2020 Free Software Foundation, Inc.
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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 3, 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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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#if !IN_GCOV_TOOL
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/* Configured via the GCOV_ERROR_FILE environment variable;
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it will either be stderr, or a file of the user's choosing.
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Non-static to prevent multiple gcov-aware shared objects from
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instantiating their own copies. */
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FILE *__gcov_error_file = NULL;
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#endif
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/* A utility function to populate the __gcov_error_file pointer.
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This should NOT be called outside of the gcov system driver code. */
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static FILE *
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get_gcov_error_file (void)
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{
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#if IN_GCOV_TOOL
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return stderr;
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#else
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if (!__gcov_error_file)
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{
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const char *gcov_error_filename = getenv ("GCOV_ERROR_FILE");
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if (gcov_error_filename)
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__gcov_error_file = fopen (gcov_error_filename, "a");
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if (!__gcov_error_file)
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__gcov_error_file = stderr;
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}
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return __gcov_error_file;
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#endif
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}
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/* A utility function for outputting errors. */
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static int __attribute__((format(printf, 1, 2)))
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gcov_error (const char *fmt, ...)
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{
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int ret;
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va_list argp;
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va_start (argp, fmt);
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FILE *f = get_gcov_error_file ();
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ret = vfprintf (f, fmt, argp);
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va_end (argp);
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if (getenv ("GCOV_EXIT_AT_ERROR"))
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{
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fprintf (f, "profiling:exiting after an error\n");
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exit (1);
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}
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return ret;
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}
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#if !IN_GCOV_TOOL
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static void
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gcov_error_exit (void)
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{
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if (__gcov_error_file && __gcov_error_file != stderr)
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{
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fclose (__gcov_error_file);
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__gcov_error_file = NULL;
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}
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}
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#endif
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/* Make sure path component of the given FILENAME exists, create
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missing directories. FILENAME must be writable.
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Returns zero on success, or -1 if an error occurred. */
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static int
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create_file_directory (char *filename)
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{
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#if !defined(TARGET_POSIX_IO) && !defined(_WIN32)
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(void) filename;
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return -1;
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#else
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char *s;
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s = filename;
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if (HAS_DRIVE_SPEC(s))
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s += 2;
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if (IS_DIR_SEPARATOR(*s))
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++s;
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for (; *s != '\0'; s++)
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if (IS_DIR_SEPARATOR(*s))
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{
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char sep = *s;
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*s = '\0';
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/* Try to make directory if it doesn't already exist. */
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if (access (filename, F_OK) == -1
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#ifdef TARGET_POSIX_IO
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&& mkdir (filename, 0755) == -1
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#else
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#ifdef mkdir
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#undef mkdir
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#endif
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&& mkdir (filename) == -1
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#endif
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/* The directory might have been made by another process. */
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&& errno != EEXIST)
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{
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gcov_error ("profiling:%s:Cannot create directory\n", filename);
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*s = sep;
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return -1;
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};
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*s = sep;
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};
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return 0;
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#endif
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}
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/* Replace filename variables in FILENAME. We currently support expansion:
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%p - process ID
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%q{ENV} - value of environment variable ENV
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*/
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static char *
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replace_filename_variables (char *filename)
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{
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char buffer[16];
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char empty[] = "";
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for (char *p = filename; *p != '\0'; p++)
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{
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unsigned length = strlen (filename);
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if (*p == '%' && *(p + 1) != '\0')
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{
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unsigned start = p - filename;
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p++;
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char *replacement = NULL;
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switch (*p)
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{
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case 'p':
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sprintf (buffer, "%d", getpid ());
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replacement = buffer;
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p++;
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break;
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case 'q':
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if (*(p + 1) == '{')
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{
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p += 2;
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char *e = strchr (p, '}');
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if (e)
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{
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*e = '\0';
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replacement = getenv (p);
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if (replacement == NULL)
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replacement = empty;
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p = e + 1;
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}
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else
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return filename;
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}
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break;
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default:
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return filename;
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}
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/* Concat beginning of the path, replacement and
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ending of the path. */
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unsigned end = length - (p - filename);
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unsigned repl_length = replacement != NULL ? strlen (replacement) : 0;
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char *buffer = (char *)xmalloc (start + end + repl_length + 1);
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char *buffer_ptr = buffer;
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buffer_ptr = (char *)memcpy (buffer_ptr, filename, start);
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buffer_ptr += start;
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if (replacement != NULL)
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buffer_ptr = (char *)memcpy (buffer_ptr, replacement, repl_length);
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buffer_ptr += repl_length;
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buffer_ptr = (char *)memcpy (buffer_ptr, p, end);
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buffer_ptr += end;
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*buffer_ptr = '\0';
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free (filename);
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filename = buffer;
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p = buffer + start + repl_length;
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}
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}
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return filename;
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}
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static void
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allocate_filename_struct (struct gcov_filename *gf)
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{
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const char *gcov_prefix;
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size_t prefix_length;
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int strip = 0;
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gf->filename = NULL;
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{
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/* Check if the level of dirs to strip off specified. */
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char *tmp = getenv("GCOV_PREFIX_STRIP");
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if (tmp)
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{
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strip = atoi (tmp);
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/* Do not consider negative values. */
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if (strip < 0)
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strip = 0;
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}
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}
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gf->strip = strip;
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/* Get file name relocation prefix. Non-absolute values are ignored. */
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gcov_prefix = getenv("GCOV_PREFIX");
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prefix_length = gcov_prefix ? strlen (gcov_prefix) : 0;
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/* Remove an unnecessary trailing '/' */
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if (prefix_length && IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1]))
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prefix_length--;
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/* If no prefix was specified and a prefix stip, then we assume
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relative. */
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if (!prefix_length && gf->strip)
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{
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gcov_prefix = ".";
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prefix_length = 1;
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}
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/* Allocate and initialize the filename scratch space. */
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if (prefix_length)
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{
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gf->prefix = (char *) xmalloc (prefix_length + 1);
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char *p = (char *) memcpy (gf->prefix, gcov_prefix, prefix_length);
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*(p + prefix_length) = '\0';
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}
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else
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gf->prefix = NULL;
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}
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/* Open a gcda file specified by GI_FILENAME.
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Return -1 on error. Return 0 on success. */
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static int
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gcov_exit_open_gcda_file (struct gcov_info *gi_ptr,
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struct gcov_filename *gf)
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{
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int append_slash = 0;
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const char *fname = gi_ptr->filename;
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/* Build relocated filename, stripping off leading
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directories from the initial filename if requested. */
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if (gf->strip > 0)
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{
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const char *probe = fname;
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int level;
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/* Remove a leading separator, without counting it. */
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if (IS_DIR_SEPARATOR (*probe))
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probe++;
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/* Skip selected directory levels. If we fall off the end, we
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keep the final part. */
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for (level = gf->strip; *probe && level; probe++)
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if (IS_DIR_SEPARATOR (*probe))
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{
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fname = probe;
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level--;
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}
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}
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/* Update complete filename with stripped original. */
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if (gf->prefix)
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{
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/* Avoid to add multiple drive letters into combined path. */
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if (HAS_DRIVE_SPEC(fname))
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fname += 2;
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if (!IS_DIR_SEPARATOR (*fname))
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append_slash = 1;
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}
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size_t prefix_length = gf->prefix ? strlen (gf->prefix) : 0;
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gf->filename = (char *) xmalloc (prefix_length + strlen (fname) + 2);
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*gf->filename = '\0';
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if (prefix_length)
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strcat (gf->filename, gf->prefix);
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if (append_slash)
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*gf->filename++ = '/';
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strcat (gf->filename, fname);
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gf->filename = replace_filename_variables (gf->filename);
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if (!gcov_open (gf->filename))
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{
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/* Open failed likely due to missed directory.
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Create directory and retry to open file. */
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if (create_file_directory (gf->filename))
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{
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fprintf (stderr, "profiling:%s:Skip\n", gf->filename);
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return -1;
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}
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if (!gcov_open (gf->filename))
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{
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fprintf (stderr, "profiling:%s:Cannot open\n", gf->filename);
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return -1;
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}
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}
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return 0;
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}
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