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111
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1 /* Routines required for instrumenting a program. */
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2 /* Compile this one with gcc. */
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145
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3 /* Copyright (C) 1989-2020 Free Software Foundation, Inc.
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111
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #if !IN_GCOV_TOOL
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27 /* Configured via the GCOV_ERROR_FILE environment variable;
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28 it will either be stderr, or a file of the user's choosing.
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29 Non-static to prevent multiple gcov-aware shared objects from
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30 instantiating their own copies. */
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31 FILE *__gcov_error_file = NULL;
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32 #endif
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33
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34 /* A utility function to populate the __gcov_error_file pointer.
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35 This should NOT be called outside of the gcov system driver code. */
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36
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37 static FILE *
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38 get_gcov_error_file (void)
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39 {
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40 #if IN_GCOV_TOOL
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41 return stderr;
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42 #else
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43 if (!__gcov_error_file)
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44 {
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45 const char *gcov_error_filename = getenv ("GCOV_ERROR_FILE");
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46
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47 if (gcov_error_filename)
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48 __gcov_error_file = fopen (gcov_error_filename, "a");
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49 if (!__gcov_error_file)
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50 __gcov_error_file = stderr;
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51 }
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52 return __gcov_error_file;
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53 #endif
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54 }
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55
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56 /* A utility function for outputting errors. */
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57
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58 static int __attribute__((format(printf, 1, 2)))
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59 gcov_error (const char *fmt, ...)
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60 {
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61 int ret;
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62 va_list argp;
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63
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64 va_start (argp, fmt);
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131
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65 FILE *f = get_gcov_error_file ();
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66 ret = vfprintf (f, fmt, argp);
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111
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67 va_end (argp);
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131
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68
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69 if (getenv ("GCOV_EXIT_AT_ERROR"))
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70 {
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71 fprintf (f, "profiling:exiting after an error\n");
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72 exit (1);
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73 }
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74
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111
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75 return ret;
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76 }
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77
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78 #if !IN_GCOV_TOOL
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79 static void
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80 gcov_error_exit (void)
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81 {
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82 if (__gcov_error_file && __gcov_error_file != stderr)
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83 {
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84 fclose (__gcov_error_file);
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85 __gcov_error_file = NULL;
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86 }
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87 }
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88 #endif
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89
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90 /* Make sure path component of the given FILENAME exists, create
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91 missing directories. FILENAME must be writable.
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92 Returns zero on success, or -1 if an error occurred. */
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93
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94 static int
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95 create_file_directory (char *filename)
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96 {
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97 #if !defined(TARGET_POSIX_IO) && !defined(_WIN32)
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98 (void) filename;
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99 return -1;
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100 #else
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101 char *s;
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102
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103 s = filename;
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104
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105 if (HAS_DRIVE_SPEC(s))
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106 s += 2;
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107 if (IS_DIR_SEPARATOR(*s))
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108 ++s;
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109 for (; *s != '\0'; s++)
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110 if (IS_DIR_SEPARATOR(*s))
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111 {
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112 char sep = *s;
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113 *s = '\0';
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114
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115 /* Try to make directory if it doesn't already exist. */
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116 if (access (filename, F_OK) == -1
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117 #ifdef TARGET_POSIX_IO
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118 && mkdir (filename, 0755) == -1
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119 #else
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120 #ifdef mkdir
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121 #undef mkdir
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122 #endif
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123 && mkdir (filename) == -1
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124 #endif
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125 /* The directory might have been made by another process. */
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126 && errno != EEXIST)
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127 {
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128 gcov_error ("profiling:%s:Cannot create directory\n", filename);
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129 *s = sep;
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130 return -1;
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131 };
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132
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133 *s = sep;
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134 };
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135 return 0;
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136 #endif
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137 }
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138
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131
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139 /* Replace filename variables in FILENAME. We currently support expansion:
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140
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141 %p - process ID
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142 %q{ENV} - value of environment variable ENV
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143 */
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144
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145 static char *
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146 replace_filename_variables (char *filename)
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147 {
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148 char buffer[16];
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149 char empty[] = "";
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150 for (char *p = filename; *p != '\0'; p++)
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151 {
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152 unsigned length = strlen (filename);
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153 if (*p == '%' && *(p + 1) != '\0')
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154 {
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155 unsigned start = p - filename;
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156 p++;
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157 char *replacement = NULL;
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158 switch (*p)
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159 {
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160 case 'p':
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161 sprintf (buffer, "%d", getpid ());
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162 replacement = buffer;
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163 p++;
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164 break;
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165 case 'q':
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166 if (*(p + 1) == '{')
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167 {
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168 p += 2;
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169 char *e = strchr (p, '}');
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170 if (e)
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171 {
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172 *e = '\0';
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173 replacement = getenv (p);
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174 if (replacement == NULL)
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175 replacement = empty;
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176 p = e + 1;
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177 }
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178 else
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179 return filename;
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180 }
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181 break;
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182 default:
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183 return filename;
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184 }
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185
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186 /* Concat beginning of the path, replacement and
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187 ending of the path. */
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188 unsigned end = length - (p - filename);
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145
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189 unsigned repl_length = replacement != NULL ? strlen (replacement) : 0;
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131
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190
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191 char *buffer = (char *)xmalloc (start + end + repl_length + 1);
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192 char *buffer_ptr = buffer;
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193 buffer_ptr = (char *)memcpy (buffer_ptr, filename, start);
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194 buffer_ptr += start;
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145
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195 if (replacement != NULL)
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196 buffer_ptr = (char *)memcpy (buffer_ptr, replacement, repl_length);
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131
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197 buffer_ptr += repl_length;
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198 buffer_ptr = (char *)memcpy (buffer_ptr, p, end);
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199 buffer_ptr += end;
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200 *buffer_ptr = '\0';
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201
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202 free (filename);
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203 filename = buffer;
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204 p = buffer + start + repl_length;
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205 }
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206 }
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207
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208 return filename;
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209 }
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210
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111
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211 static void
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212 allocate_filename_struct (struct gcov_filename *gf)
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213 {
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214 const char *gcov_prefix;
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215 size_t prefix_length;
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216 int strip = 0;
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131
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217 gf->filename = NULL;
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111
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218
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219 {
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220 /* Check if the level of dirs to strip off specified. */
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221 char *tmp = getenv("GCOV_PREFIX_STRIP");
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222 if (tmp)
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223 {
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224 strip = atoi (tmp);
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225 /* Do not consider negative values. */
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226 if (strip < 0)
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227 strip = 0;
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228 }
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229 }
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230 gf->strip = strip;
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231
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232 /* Get file name relocation prefix. Non-absolute values are ignored. */
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233 gcov_prefix = getenv("GCOV_PREFIX");
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234 prefix_length = gcov_prefix ? strlen (gcov_prefix) : 0;
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235
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236 /* Remove an unnecessary trailing '/' */
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237 if (prefix_length && IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1]))
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238 prefix_length--;
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239
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240 /* If no prefix was specified and a prefix stip, then we assume
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241 relative. */
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242 if (!prefix_length && gf->strip)
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243 {
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244 gcov_prefix = ".";
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245 prefix_length = 1;
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246 }
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247
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248 /* Allocate and initialize the filename scratch space. */
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249 if (prefix_length)
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131
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250 {
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251 gf->prefix = (char *) xmalloc (prefix_length + 1);
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252 char *p = (char *) memcpy (gf->prefix, gcov_prefix, prefix_length);
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253 *(p + prefix_length) = '\0';
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254 }
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255 else
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256 gf->prefix = NULL;
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111
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257 }
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258
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259 /* Open a gcda file specified by GI_FILENAME.
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260 Return -1 on error. Return 0 on success. */
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261
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262 static int
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263 gcov_exit_open_gcda_file (struct gcov_info *gi_ptr,
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264 struct gcov_filename *gf)
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265 {
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145
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266 int append_slash = 0;
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111
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267 const char *fname = gi_ptr->filename;
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268
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269 /* Build relocated filename, stripping off leading
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270 directories from the initial filename if requested. */
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271 if (gf->strip > 0)
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272 {
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273 const char *probe = fname;
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274 int level;
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275
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276 /* Remove a leading separator, without counting it. */
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277 if (IS_DIR_SEPARATOR (*probe))
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278 probe++;
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279
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280 /* Skip selected directory levels. If we fall off the end, we
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281 keep the final part. */
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282 for (level = gf->strip; *probe && level; probe++)
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283 if (IS_DIR_SEPARATOR (*probe))
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284 {
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285 fname = probe;
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286 level--;
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287 }
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288 }
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289
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290 /* Update complete filename with stripped original. */
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291 if (gf->prefix)
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292 {
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293 /* Avoid to add multiple drive letters into combined path. */
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294 if (HAS_DRIVE_SPEC(fname))
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295 fname += 2;
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296
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297 if (!IS_DIR_SEPARATOR (*fname))
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131
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298 append_slash = 1;
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111
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299 }
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131
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300
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301 size_t prefix_length = gf->prefix ? strlen (gf->prefix) : 0;
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302 gf->filename = (char *) xmalloc (prefix_length + strlen (fname) + 2);
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303 *gf->filename = '\0';
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304 if (prefix_length)
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305 strcat (gf->filename, gf->prefix);
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306 if (append_slash)
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307 *gf->filename++ = '/';
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308 strcat (gf->filename, fname);
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309
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310 gf->filename = replace_filename_variables (gf->filename);
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111
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311
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312 if (!gcov_open (gf->filename))
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313 {
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314 /* Open failed likely due to missed directory.
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315 Create directory and retry to open file. */
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316 if (create_file_directory (gf->filename))
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317 {
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318 fprintf (stderr, "profiling:%s:Skip\n", gf->filename);
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319 return -1;
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320 }
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321 if (!gcov_open (gf->filename))
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322 {
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323 fprintf (stderr, "profiling:%s:Cannot open\n", gf->filename);
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324 return -1;
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325 }
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326 }
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327
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328 return 0;
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329 }
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