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111
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1 /* Header file for libgcov-*.c.
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2 Copyright (C) 1996-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #ifndef GCC_LIBGCOV_H
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26 #define GCC_LIBGCOV_H
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27
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28 /* work around the poisoned malloc/calloc in system.h. */
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29 #ifndef xmalloc
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30 #define xmalloc malloc
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31 #endif
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32 #ifndef xcalloc
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33 #define xcalloc calloc
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34 #endif
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35
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36 #ifndef IN_GCOV_TOOL
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37 /* About the target. */
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38 /* This path will be used by libgcov runtime. */
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39
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40 #include "tconfig.h"
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41 #include "auto-target.h"
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42 #include "tsystem.h"
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43 #include "coretypes.h"
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44 #include "tm.h"
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45 #include "libgcc_tm.h"
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46 #include "gcov.h"
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47
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48 #if __CHAR_BIT__ == 8
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49 typedef unsigned gcov_unsigned_t __attribute__ ((mode (SI)));
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50 typedef unsigned gcov_position_t __attribute__ ((mode (SI)));
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51 #if LONG_LONG_TYPE_SIZE > 32
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52 typedef signed gcov_type __attribute__ ((mode (DI)));
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53 typedef unsigned gcov_type_unsigned __attribute__ ((mode (DI)));
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54 #else
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55 typedef signed gcov_type __attribute__ ((mode (SI)));
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56 typedef unsigned gcov_type_unsigned __attribute__ ((mode (SI)));
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57 #endif
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58 #else
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59 #if __CHAR_BIT__ == 16
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60 typedef unsigned gcov_unsigned_t __attribute__ ((mode (HI)));
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61 typedef unsigned gcov_position_t __attribute__ ((mode (HI)));
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62 #if LONG_LONG_TYPE_SIZE > 32
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63 typedef signed gcov_type __attribute__ ((mode (SI)));
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64 typedef unsigned gcov_type_unsigned __attribute__ ((mode (SI)));
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65 #else
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66 typedef signed gcov_type __attribute__ ((mode (HI)));
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67 typedef unsigned gcov_type_unsigned __attribute__ ((mode (HI)));
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68 #endif
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69 #else
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70 typedef unsigned gcov_unsigned_t __attribute__ ((mode (QI)));
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71 typedef unsigned gcov_position_t __attribute__ ((mode (QI)));
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72 #if LONG_LONG_TYPE_SIZE > 32
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73 typedef signed gcov_type __attribute__ ((mode (HI)));
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74 typedef unsigned gcov_type_unsigned __attribute__ ((mode (HI)));
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75 #else
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76 typedef signed gcov_type __attribute__ ((mode (QI)));
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77 typedef unsigned gcov_type_unsigned __attribute__ ((mode (QI)));
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78 #endif
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79 #endif
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80 #endif
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81
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82 #if defined (TARGET_POSIX_IO)
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83 #define GCOV_LOCKED 1
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84 #else
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85 #define GCOV_LOCKED 0
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86 #endif
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87
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88 /* In libgcov we need these functions to be extern, so prefix them with
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89 __gcov. In libgcov they must also be hidden so that the instance in
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90 the executable is not also used in a DSO. */
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91 #define gcov_var __gcov_var
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92 #define gcov_open __gcov_open
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93 #define gcov_close __gcov_close
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94 #define gcov_write_tag_length __gcov_write_tag_length
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95 #define gcov_position __gcov_position
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96 #define gcov_seek __gcov_seek
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97 #define gcov_rewrite __gcov_rewrite
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98 #define gcov_is_error __gcov_is_error
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99 #define gcov_write_unsigned __gcov_write_unsigned
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100 #define gcov_write_counter __gcov_write_counter
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101 #define gcov_write_summary __gcov_write_summary
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102 #define gcov_read_unsigned __gcov_read_unsigned
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103 #define gcov_read_counter __gcov_read_counter
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104 #define gcov_read_summary __gcov_read_summary
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105 #define gcov_sort_n_vals __gcov_sort_n_vals
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106
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107 #else /* IN_GCOV_TOOL */
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108 /* About the host. */
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109 /* This path will be compiled for the host and linked into
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110 gcov-tool binary. */
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111
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112 #include "config.h"
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113 #include "system.h"
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114 #include "coretypes.h"
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115 #include "tm.h"
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116
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117 typedef unsigned gcov_unsigned_t;
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118 typedef unsigned gcov_position_t;
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119 /* gcov_type is typedef'd elsewhere for the compiler */
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120 #if defined (HOST_HAS_F_SETLKW)
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121 #define GCOV_LOCKED 1
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122 #else
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123 #define GCOV_LOCKED 0
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124 #endif
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125
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126 /* Some Macros specific to gcov-tool. */
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127
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128 #define L_gcov 1
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129 #define L_gcov_merge_add 1
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130 #define L_gcov_merge_single 1
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131 #define L_gcov_merge_ior 1
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132 #define L_gcov_merge_time_profile 1
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133 #define L_gcov_merge_icall_topn 1
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134
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135 extern gcov_type gcov_read_counter_mem ();
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136 extern unsigned gcov_get_merge_weight ();
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137 extern struct gcov_info *gcov_list;
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138
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139 #endif /* !IN_GCOV_TOOL */
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140
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141 #if defined(inhibit_libc)
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142 #define IN_LIBGCOV (-1)
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143 #else
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144 #define IN_LIBGCOV 1
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145 #if defined(L_gcov)
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146 #define GCOV_LINKAGE /* nothing */
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147 #endif
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148 #endif
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149
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150 /* Poison these, so they don't accidentally slip in. */
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151 #pragma GCC poison gcov_write_string gcov_write_tag gcov_write_length
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152 #pragma GCC poison gcov_time gcov_magic
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153
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154 #ifdef HAVE_GAS_HIDDEN
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155 #define ATTRIBUTE_HIDDEN __attribute__ ((__visibility__ ("hidden")))
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156 #else
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157 #define ATTRIBUTE_HIDDEN
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158 #endif
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159
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160 #include "gcov-io.h"
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161
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162 /* Structures embedded in coveraged program. The structures generated
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163 by write_profile must match these. */
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164
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165 /* Information about counters for a single function. */
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166 struct gcov_ctr_info
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167 {
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168 gcov_unsigned_t num; /* number of counters. */
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169 gcov_type *values; /* their values. */
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170 };
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171
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172 /* Information about a single function. This uses the trailing array
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173 idiom. The number of counters is determined from the merge pointer
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174 array in gcov_info. The key is used to detect which of a set of
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175 comdat functions was selected -- it points to the gcov_info object
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176 of the object file containing the selected comdat function. */
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177
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178 struct gcov_fn_info
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179 {
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180 const struct gcov_info *key; /* comdat key */
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181 gcov_unsigned_t ident; /* unique ident of function */
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182 gcov_unsigned_t lineno_checksum; /* function lineo_checksum */
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183 gcov_unsigned_t cfg_checksum; /* function cfg checksum */
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184 struct gcov_ctr_info ctrs[1]; /* instrumented counters */
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185 };
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186
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187 /* Type of function used to merge counters. */
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188 typedef void (*gcov_merge_fn) (gcov_type *, gcov_unsigned_t);
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189
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190 /* Information about a single object file. */
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191 struct gcov_info
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192 {
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193 gcov_unsigned_t version; /* expected version number */
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194 struct gcov_info *next; /* link to next, used by libgcov */
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195
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196 gcov_unsigned_t stamp; /* uniquifying time stamp */
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197 const char *filename; /* output file name */
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198
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199 gcov_merge_fn merge[GCOV_COUNTERS]; /* merge functions (null for
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200 unused) */
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201
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202 unsigned n_functions; /* number of functions */
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203
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204 #ifndef IN_GCOV_TOOL
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205 const struct gcov_fn_info *const *functions; /* pointer to pointers
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206 to function information */
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207 #else
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208 const struct gcov_fn_info **functions;
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209 #endif /* !IN_GCOV_TOOL */
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210 };
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211
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212 /* Root of a program/shared-object state */
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213 struct gcov_root
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214 {
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215 struct gcov_info *list;
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216 unsigned dumped : 1; /* counts have been dumped. */
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217 unsigned run_counted : 1; /* run has been accounted for. */
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218 struct gcov_root *next;
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219 struct gcov_root *prev;
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220 };
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221
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222 extern struct gcov_root __gcov_root ATTRIBUTE_HIDDEN;
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223
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224 struct gcov_master
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225 {
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226 gcov_unsigned_t version;
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227 struct gcov_root *root;
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228 };
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229
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230 /* Exactly one of these will be active in the process. */
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231 extern struct gcov_master __gcov_master;
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232
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233 /* Dump a set of gcov objects. */
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234 extern void __gcov_dump_one (struct gcov_root *) ATTRIBUTE_HIDDEN;
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235
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236 /* Register a new object file module. */
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237 extern void __gcov_init (struct gcov_info *) ATTRIBUTE_HIDDEN;
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238
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239 /* GCOV exit function registered via a static destructor. */
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240 extern void __gcov_exit (void) ATTRIBUTE_HIDDEN;
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241
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242 /* Function to reset all counters to 0. Both externally visible (and
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243 overridable) and internal version. */
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244 extern void __gcov_reset_int (void) ATTRIBUTE_HIDDEN;
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245
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246 /* User function to enable early write of profile information so far. */
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247 extern void __gcov_dump_int (void) ATTRIBUTE_HIDDEN;
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248
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249 /* The merge function that just sums the counters. */
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250 extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
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251
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252 /* The merge function to select the minimum valid counter value. */
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253 extern void __gcov_merge_time_profile (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
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254
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255 /* The merge function to choose the most common value. */
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256 extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
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257
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258 /* The merge function that just ors the counters together. */
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259 extern void __gcov_merge_ior (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
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260
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261 /* The merge function is used for topn indirect call counters. */
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262 extern void __gcov_merge_icall_topn (gcov_type *, unsigned) ATTRIBUTE_HIDDEN;
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263
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264 /* The profiler functions. */
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265 extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned);
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266 extern void __gcov_interval_profiler_atomic (gcov_type *, gcov_type, int,
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267 unsigned);
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268 extern void __gcov_pow2_profiler (gcov_type *, gcov_type);
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269 extern void __gcov_pow2_profiler_atomic (gcov_type *, gcov_type);
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270 extern void __gcov_one_value_profiler (gcov_type *, gcov_type);
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271 extern void __gcov_one_value_profiler_atomic (gcov_type *, gcov_type);
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272 extern void __gcov_indirect_call_profiler_v2 (gcov_type, void *);
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273 extern void __gcov_time_profiler (gcov_type *);
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274 extern void __gcov_time_profiler_atomic (gcov_type *);
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275 extern void __gcov_average_profiler (gcov_type *, gcov_type);
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276 extern void __gcov_average_profiler_atomic (gcov_type *, gcov_type);
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277 extern void __gcov_ior_profiler (gcov_type *, gcov_type);
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278 extern void __gcov_ior_profiler_atomic (gcov_type *, gcov_type);
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279 extern void __gcov_indirect_call_topn_profiler (gcov_type, void *);
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280 extern void gcov_sort_n_vals (gcov_type *, int);
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281
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282 #ifndef inhibit_libc
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283 /* The wrappers around some library functions.. */
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284 extern pid_t __gcov_fork (void) ATTRIBUTE_HIDDEN;
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285 extern int __gcov_execl (const char *, char *, ...) ATTRIBUTE_HIDDEN;
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286 extern int __gcov_execlp (const char *, char *, ...) ATTRIBUTE_HIDDEN;
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287 extern int __gcov_execle (const char *, char *, ...) ATTRIBUTE_HIDDEN;
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288 extern int __gcov_execv (const char *, char *const []) ATTRIBUTE_HIDDEN;
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289 extern int __gcov_execvp (const char *, char *const []) ATTRIBUTE_HIDDEN;
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290 extern int __gcov_execve (const char *, char *const [], char *const [])
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291 ATTRIBUTE_HIDDEN;
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292
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293 /* Functions that only available in libgcov. */
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294 GCOV_LINKAGE int gcov_open (const char */*name*/) ATTRIBUTE_HIDDEN;
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295 GCOV_LINKAGE void gcov_write_counter (gcov_type) ATTRIBUTE_HIDDEN;
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296 GCOV_LINKAGE void gcov_write_tag_length (gcov_unsigned_t, gcov_unsigned_t)
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297 ATTRIBUTE_HIDDEN;
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298 GCOV_LINKAGE void gcov_write_summary (gcov_unsigned_t /*tag*/,
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299 const struct gcov_summary *)
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300 ATTRIBUTE_HIDDEN;
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301 GCOV_LINKAGE void gcov_seek (gcov_position_t /*position*/) ATTRIBUTE_HIDDEN;
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302 GCOV_LINKAGE void gcov_rewrite (void) ATTRIBUTE_HIDDEN;
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303
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304 /* "Counts" stored in gcda files can be a real counter value, or
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305 an target address. When differentiate these two types because
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306 when manipulating counts, we should only change real counter values,
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307 rather target addresses. */
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308
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309 static inline gcov_type
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310 gcov_get_counter (void)
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311 {
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312 #ifndef IN_GCOV_TOOL
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313 /* This version is for reading count values in libgcov runtime:
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314 we read from gcda files. */
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315
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316 return gcov_read_counter ();
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317 #else
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318 /* This version is for gcov-tool. We read the value from memory and
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319 multiply it by the merge weight. */
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320
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321 return gcov_read_counter_mem () * gcov_get_merge_weight ();
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322 #endif
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323 }
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324
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325 /* Similar function as gcov_get_counter(), but handles target address
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326 counters. */
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327
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328 static inline gcov_type
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329 gcov_get_counter_target (void)
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330 {
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331 #ifndef IN_GCOV_TOOL
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332 /* This version is for reading count target values in libgcov runtime:
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333 we read from gcda files. */
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334
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335 return gcov_read_counter ();
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336 #else
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337 /* This version is for gcov-tool. We read the value from memory and we do NOT
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338 multiply it by the merge weight. */
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339
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340 return gcov_read_counter_mem ();
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341 #endif
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342 }
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343
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344 #endif /* !inhibit_libc */
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345
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346 #endif /* GCC_LIBGCOV_H */
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