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0
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1 /* File format for coverage information
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2 Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004, 2005, 2007,
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3 2008 Free Software Foundation, Inc.
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4 Contributed by Bob Manson <manson@cygnus.com>.
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5 Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License as published by the Free
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11 Software Foundation; either version 3, or (at your option) any later
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12 version.
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13
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14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with GCC; see the file COPYING3. If not see
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21 <http://www.gnu.org/licenses/>. */
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22
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23 /* Routines declared in gcov-io.h. This file should be #included by
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24 another source file, after having #included gcov-io.h. */
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25
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26 #if !IN_GCOV
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27 static void gcov_write_block (unsigned);
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28 static gcov_unsigned_t *gcov_write_words (unsigned);
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29 #endif
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30 static const gcov_unsigned_t *gcov_read_words (unsigned);
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31 #if !IN_LIBGCOV
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32 static void gcov_allocate (unsigned);
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33 #endif
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34
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35 static inline gcov_unsigned_t from_file (gcov_unsigned_t value)
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36 {
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37 #if !IN_LIBGCOV
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38 if (gcov_var.endian)
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39 {
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40 value = (value >> 16) | (value << 16);
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41 value = ((value & 0xff00ff) << 8) | ((value >> 8) & 0xff00ff);
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42 }
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43 #endif
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44 return value;
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45 }
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46
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47 /* Open a gcov file. NAME is the name of the file to open and MODE
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48 indicates whether a new file should be created, or an existing file
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49 opened for modification. If MODE is >= 0 an existing file will be
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50 opened, if possible, and if MODE is <= 0, a new file will be
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51 created. Use MODE=0 to attempt to reopen an existing file and then
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52 fall back on creating a new one. Return zero on failure, >0 on
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53 opening an existing file and <0 on creating a new one. */
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54
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55 GCOV_LINKAGE int
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56 #if IN_LIBGCOV
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57 gcov_open (const char *name)
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58 #else
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59 gcov_open (const char *name, int mode)
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60 #endif
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61 {
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62 #if IN_LIBGCOV
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63 const int mode = 0;
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64 #endif
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65 #if GCOV_LOCKED
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66 struct flock s_flock;
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67 int fd;
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68
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69 s_flock.l_type = F_WRLCK;
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70 s_flock.l_whence = SEEK_SET;
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71 s_flock.l_start = 0;
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72 s_flock.l_len = 0; /* Until EOF. */
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73 s_flock.l_pid = getpid ();
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74 #endif
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75
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76 gcc_assert (!gcov_var.file);
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77 gcov_var.start = 0;
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78 gcov_var.offset = gcov_var.length = 0;
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79 gcov_var.overread = -1u;
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80 gcov_var.error = 0;
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81 #if !IN_LIBGCOV
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82 gcov_var.endian = 0;
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83 #endif
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84 #if GCOV_LOCKED
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85 if (mode > 0)
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86 fd = open (name, O_RDWR);
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87 else
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88 fd = open (name, O_RDWR | O_CREAT, 0666);
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89 if (fd < 0)
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90 return 0;
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91
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92 while (fcntl (fd, F_SETLKW, &s_flock) && errno == EINTR)
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93 continue;
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94
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95 gcov_var.file = fdopen (fd, "r+b");
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96 if (!gcov_var.file)
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97 {
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98 close (fd);
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99 return 0;
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100 }
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101
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102 if (mode > 0)
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103 gcov_var.mode = 1;
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104 else if (mode == 0)
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105 {
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106 struct stat st;
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107
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108 if (fstat (fd, &st) < 0)
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109 {
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110 fclose (gcov_var.file);
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111 gcov_var.file = 0;
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112 return 0;
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113 }
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114 if (st.st_size != 0)
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115 gcov_var.mode = 1;
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116 else
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117 gcov_var.mode = mode * 2 + 1;
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118 }
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119 else
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120 gcov_var.mode = mode * 2 + 1;
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121 #else
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122 if (mode >= 0)
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123 gcov_var.file = fopen (name, "r+b");
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124 if (gcov_var.file)
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125 gcov_var.mode = 1;
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126 else if (mode <= 0)
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127 {
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128 gcov_var.file = fopen (name, "w+b");
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129 if (gcov_var.file)
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130 gcov_var.mode = mode * 2 + 1;
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131 }
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132 if (!gcov_var.file)
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133 return 0;
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134 #endif
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135
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136 setbuf (gcov_var.file, (char *)0);
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137
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138 return 1;
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139 }
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140
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141 /* Close the current gcov file. Flushes data to disk. Returns nonzero
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142 on failure or error flag set. */
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143
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144 GCOV_LINKAGE int
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145 gcov_close (void)
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146 {
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147 if (gcov_var.file)
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148 {
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149 #if !IN_GCOV
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150 if (gcov_var.offset && gcov_var.mode < 0)
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151 gcov_write_block (gcov_var.offset);
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152 #endif
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153 fclose (gcov_var.file);
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154 gcov_var.file = 0;
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155 gcov_var.length = 0;
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156 }
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157 #if !IN_LIBGCOV
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158 free (gcov_var.buffer);
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159 gcov_var.alloc = 0;
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160 gcov_var.buffer = 0;
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161 #endif
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162 gcov_var.mode = 0;
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163 return gcov_var.error;
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164 }
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165
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166 #if !IN_LIBGCOV
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167 /* Check if MAGIC is EXPECTED. Use it to determine endianness of the
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168 file. Returns +1 for same endian, -1 for other endian and zero for
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169 not EXPECTED. */
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170
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171 GCOV_LINKAGE int
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172 gcov_magic (gcov_unsigned_t magic, gcov_unsigned_t expected)
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173 {
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174 if (magic == expected)
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175 return 1;
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176 magic = (magic >> 16) | (magic << 16);
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177 magic = ((magic & 0xff00ff) << 8) | ((magic >> 8) & 0xff00ff);
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178 if (magic == expected)
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179 {
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180 gcov_var.endian = 1;
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181 return -1;
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182 }
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183 return 0;
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184 }
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185 #endif
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186
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187 #if !IN_LIBGCOV
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188 static void
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189 gcov_allocate (unsigned length)
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190 {
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191 size_t new_size = gcov_var.alloc;
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192
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193 if (!new_size)
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194 new_size = GCOV_BLOCK_SIZE;
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195 new_size += length;
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196 new_size *= 2;
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197
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198 gcov_var.alloc = new_size;
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199 gcov_var.buffer = XRESIZEVAR (gcov_unsigned_t, gcov_var.buffer, new_size << 2);
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200 }
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201 #endif
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202
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203 #if !IN_GCOV
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204 /* Write out the current block, if needs be. */
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205
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206 static void
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207 gcov_write_block (unsigned size)
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208 {
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209 if (fwrite (gcov_var.buffer, size << 2, 1, gcov_var.file) != 1)
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210 gcov_var.error = 1;
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211 gcov_var.start += size;
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212 gcov_var.offset -= size;
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213 }
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214
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215 /* Allocate space to write BYTES bytes to the gcov file. Return a
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216 pointer to those bytes, or NULL on failure. */
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217
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218 static gcov_unsigned_t *
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219 gcov_write_words (unsigned words)
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220 {
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221 gcov_unsigned_t *result;
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222
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223 gcc_assert (gcov_var.mode < 0);
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224 #if IN_LIBGCOV
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225 if (gcov_var.offset >= GCOV_BLOCK_SIZE)
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226 {
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227 gcov_write_block (GCOV_BLOCK_SIZE);
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228 if (gcov_var.offset)
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229 {
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230 gcc_assert (gcov_var.offset == 1);
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231 memcpy (gcov_var.buffer, gcov_var.buffer + GCOV_BLOCK_SIZE, 4);
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232 }
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233 }
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234 #else
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235 if (gcov_var.offset + words > gcov_var.alloc)
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236 gcov_allocate (gcov_var.offset + words);
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237 #endif
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238 result = &gcov_var.buffer[gcov_var.offset];
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239 gcov_var.offset += words;
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240
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241 return result;
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242 }
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243
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244 /* Write unsigned VALUE to coverage file. Sets error flag
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245 appropriately. */
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246
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247 GCOV_LINKAGE void
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248 gcov_write_unsigned (gcov_unsigned_t value)
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249 {
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250 gcov_unsigned_t *buffer = gcov_write_words (1);
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251
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252 buffer[0] = value;
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253 }
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254
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255 /* Write counter VALUE to coverage file. Sets error flag
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256 appropriately. */
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257
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258 #if IN_LIBGCOV
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259 GCOV_LINKAGE void
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260 gcov_write_counter (gcov_type value)
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261 {
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262 gcov_unsigned_t *buffer = gcov_write_words (2);
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263
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264 buffer[0] = (gcov_unsigned_t) value;
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265 if (sizeof (value) > sizeof (gcov_unsigned_t))
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266 buffer[1] = (gcov_unsigned_t) (value >> 32);
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267 else
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268 buffer[1] = 0;
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269 }
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270 #endif /* IN_LIBGCOV */
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271
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272 #if !IN_LIBGCOV
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273 /* Write STRING to coverage file. Sets error flag on file
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274 error, overflow flag on overflow */
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275
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276 GCOV_LINKAGE void
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277 gcov_write_string (const char *string)
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278 {
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279 unsigned length = 0;
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280 unsigned alloc = 0;
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281 gcov_unsigned_t *buffer;
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282
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283 if (string)
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284 {
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285 length = strlen (string);
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286 alloc = (length + 4) >> 2;
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287 }
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288
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289 buffer = gcov_write_words (1 + alloc);
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290
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291 buffer[0] = alloc;
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292 buffer[alloc] = 0;
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293 memcpy (&buffer[1], string, length);
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294 }
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295 #endif
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296
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297 #if !IN_LIBGCOV
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298 /* Write a tag TAG and reserve space for the record length. Return a
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299 value to be used for gcov_write_length. */
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300
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301 GCOV_LINKAGE gcov_position_t
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302 gcov_write_tag (gcov_unsigned_t tag)
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303 {
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304 gcov_position_t result = gcov_var.start + gcov_var.offset;
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305 gcov_unsigned_t *buffer = gcov_write_words (2);
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306
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307 buffer[0] = tag;
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308 buffer[1] = 0;
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309
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310 return result;
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311 }
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312
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313 /* Write a record length using POSITION, which was returned by
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314 gcov_write_tag. The current file position is the end of the
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315 record, and is restored before returning. Returns nonzero on
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316 overflow. */
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317
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318 GCOV_LINKAGE void
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319 gcov_write_length (gcov_position_t position)
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320 {
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321 unsigned offset;
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322 gcov_unsigned_t length;
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323 gcov_unsigned_t *buffer;
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324
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325 gcc_assert (gcov_var.mode < 0);
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326 gcc_assert (position + 2 <= gcov_var.start + gcov_var.offset);
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327 gcc_assert (position >= gcov_var.start);
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328 offset = position - gcov_var.start;
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329 length = gcov_var.offset - offset - 2;
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330 buffer = (gcov_unsigned_t *) &gcov_var.buffer[offset];
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331 buffer[1] = length;
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332 if (gcov_var.offset >= GCOV_BLOCK_SIZE)
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333 gcov_write_block (gcov_var.offset);
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334 }
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335
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336 #else /* IN_LIBGCOV */
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337
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338 /* Write a tag TAG and length LENGTH. */
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339
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340 GCOV_LINKAGE void
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341 gcov_write_tag_length (gcov_unsigned_t tag, gcov_unsigned_t length)
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342 {
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343 gcov_unsigned_t *buffer = gcov_write_words (2);
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344
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345 buffer[0] = tag;
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346 buffer[1] = length;
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347 }
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348
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349 /* Write a summary structure to the gcov file. Return nonzero on
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350 overflow. */
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351
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352 GCOV_LINKAGE void
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353 gcov_write_summary (gcov_unsigned_t tag, const struct gcov_summary *summary)
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354 {
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355 unsigned ix;
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356 const struct gcov_ctr_summary *csum;
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357
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358 gcov_write_tag_length (tag, GCOV_TAG_SUMMARY_LENGTH);
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359 gcov_write_unsigned (summary->checksum);
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360 for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)
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361 {
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362 gcov_write_unsigned (csum->num);
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363 gcov_write_unsigned (csum->runs);
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364 gcov_write_counter (csum->sum_all);
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365 gcov_write_counter (csum->run_max);
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366 gcov_write_counter (csum->sum_max);
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367 }
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368 }
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369 #endif /* IN_LIBGCOV */
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370
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371 #endif /*!IN_GCOV */
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372
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373 /* Return a pointer to read BYTES bytes from the gcov file. Returns
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374 NULL on failure (read past EOF). */
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375
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376 static const gcov_unsigned_t *
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377 gcov_read_words (unsigned words)
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378 {
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379 const gcov_unsigned_t *result;
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380 unsigned excess = gcov_var.length - gcov_var.offset;
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381
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382 gcc_assert (gcov_var.mode > 0);
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383 if (excess < words)
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384 {
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385 gcov_var.start += gcov_var.offset;
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386 #if IN_LIBGCOV
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387 if (excess)
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388 {
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389 gcc_assert (excess == 1);
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390 memcpy (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, 4);
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391 }
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392 #else
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393 memmove (gcov_var.buffer, gcov_var.buffer + gcov_var.offset, excess * 4);
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394 #endif
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395 gcov_var.offset = 0;
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396 gcov_var.length = excess;
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397 #if IN_LIBGCOV
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398 gcc_assert (!gcov_var.length || gcov_var.length == 1);
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399 excess = GCOV_BLOCK_SIZE;
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400 #else
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401 if (gcov_var.length + words > gcov_var.alloc)
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402 gcov_allocate (gcov_var.length + words);
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403 excess = gcov_var.alloc - gcov_var.length;
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404 #endif
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405 excess = fread (gcov_var.buffer + gcov_var.length,
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406 1, excess << 2, gcov_var.file) >> 2;
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407 gcov_var.length += excess;
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408 if (gcov_var.length < words)
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409 {
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410 gcov_var.overread += words - gcov_var.length;
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411 gcov_var.length = 0;
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412 return 0;
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413 }
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414 }
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415 result = &gcov_var.buffer[gcov_var.offset];
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416 gcov_var.offset += words;
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417 return result;
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418 }
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419
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420 /* Read unsigned value from a coverage file. Sets error flag on file
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421 error, overflow flag on overflow */
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422
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423 GCOV_LINKAGE gcov_unsigned_t
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424 gcov_read_unsigned (void)
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425 {
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426 gcov_unsigned_t value;
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427 const gcov_unsigned_t *buffer = gcov_read_words (1);
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428
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429 if (!buffer)
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430 return 0;
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431 value = from_file (buffer[0]);
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432 return value;
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433 }
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434
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435 /* Read counter value from a coverage file. Sets error flag on file
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436 error, overflow flag on overflow */
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437
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438 GCOV_LINKAGE gcov_type
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439 gcov_read_counter (void)
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440 {
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441 gcov_type value;
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442 const gcov_unsigned_t *buffer = gcov_read_words (2);
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443
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444 if (!buffer)
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445 return 0;
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446 value = from_file (buffer[0]);
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447 if (sizeof (value) > sizeof (gcov_unsigned_t))
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448 value |= ((gcov_type) from_file (buffer[1])) << 32;
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449 else if (buffer[1])
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450 gcov_var.error = -1;
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451
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452 return value;
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453 }
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454
|
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455 /* Read string from coverage file. Returns a pointer to a static
|
|
|
456 buffer, or NULL on empty string. You must copy the string before
|
|
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457 calling another gcov function. */
|
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458
|
|
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459 #if !IN_LIBGCOV
|
|
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460 GCOV_LINKAGE const char *
|
|
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461 gcov_read_string (void)
|
|
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462 {
|
|
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463 unsigned length = gcov_read_unsigned ();
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|
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464
|
|
|
465 if (!length)
|
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|
466 return 0;
|
|
|
467
|
|
|
468 return (const char *) gcov_read_words (length);
|
|
|
469 }
|
|
|
470 #endif
|
|
|
471
|
|
|
472 GCOV_LINKAGE void
|
|
|
473 gcov_read_summary (struct gcov_summary *summary)
|
|
|
474 {
|
|
|
475 unsigned ix;
|
|
|
476 struct gcov_ctr_summary *csum;
|
|
|
477
|
|
|
478 summary->checksum = gcov_read_unsigned ();
|
|
|
479 for (csum = summary->ctrs, ix = GCOV_COUNTERS_SUMMABLE; ix--; csum++)
|
|
|
480 {
|
|
|
481 csum->num = gcov_read_unsigned ();
|
|
|
482 csum->runs = gcov_read_unsigned ();
|
|
|
483 csum->sum_all = gcov_read_counter ();
|
|
|
484 csum->run_max = gcov_read_counter ();
|
|
|
485 csum->sum_max = gcov_read_counter ();
|
|
|
486 }
|
|
|
487 }
|
|
|
488
|
|
|
489 #if !IN_LIBGCOV
|
|
|
490 /* Reset to a known position. BASE should have been obtained from
|
|
|
491 gcov_position, LENGTH should be a record length. */
|
|
|
492
|
|
|
493 GCOV_LINKAGE void
|
|
|
494 gcov_sync (gcov_position_t base, gcov_unsigned_t length)
|
|
|
495 {
|
|
|
496 gcc_assert (gcov_var.mode > 0);
|
|
|
497 base += length;
|
|
|
498 if (base - gcov_var.start <= gcov_var.length)
|
|
|
499 gcov_var.offset = base - gcov_var.start;
|
|
|
500 else
|
|
|
501 {
|
|
|
502 gcov_var.offset = gcov_var.length = 0;
|
|
|
503 fseek (gcov_var.file, base << 2, SEEK_SET);
|
|
|
504 gcov_var.start = ftell (gcov_var.file) >> 2;
|
|
|
505 }
|
|
|
506 }
|
|
|
507 #endif
|
|
|
508
|
|
|
509 #if IN_LIBGCOV
|
|
|
510 /* Move to a given position in a gcov file. */
|
|
|
511
|
|
|
512 GCOV_LINKAGE void
|
|
|
513 gcov_seek (gcov_position_t base)
|
|
|
514 {
|
|
|
515 gcc_assert (gcov_var.mode < 0);
|
|
|
516 if (gcov_var.offset)
|
|
|
517 gcov_write_block (gcov_var.offset);
|
|
|
518 fseek (gcov_var.file, base << 2, SEEK_SET);
|
|
|
519 gcov_var.start = ftell (gcov_var.file) >> 2;
|
|
|
520 }
|
|
|
521 #endif
|
|
|
522
|
|
|
523 #if IN_GCOV > 0
|
|
|
524 /* Return the modification time of the current gcov file. */
|
|
|
525
|
|
|
526 GCOV_LINKAGE time_t
|
|
|
527 gcov_time (void)
|
|
|
528 {
|
|
|
529 struct stat status;
|
|
|
530
|
|
|
531 if (fstat (fileno (gcov_var.file), &status))
|
|
|
532 return 0;
|
|
|
533 else
|
|
|
534 return status.st_mtime;
|
|
|
535 }
|
|
|
536 #endif /* IN_GCOV */
|
