| /* Routines required for instrumenting a program. */ |
| /* Compile this one with gcc. */ |
| /* Copyright (C) 1989-2021 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, 0777) == -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; |
| } |