annotate gcc/gcov-io.h @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents 77e2b8dfacca
children 84e7813d76e9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* File format for coverage information
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2 Copyright (C) 1996-2017 Free Software Foundation, Inc.
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3 Contributed by Bob Manson <manson@cygnus.com>.
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4 Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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18 Under Section 7 of GPL version 3, you are granted additional
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19 permissions described in the GCC Runtime Library Exception, version
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20 3.1, as published by the Free Software Foundation.
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21
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22 You should have received a copy of the GNU General Public License and
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23 a copy of the GCC Runtime Library Exception along with this program;
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24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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25 <http://www.gnu.org/licenses/>. */
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28 /* Coverage information is held in two files. A notes file, which is
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29 generated by the compiler, and a data file, which is generated by
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30 the program under test. Both files use a similar structure. We do
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31 not attempt to make these files backwards compatible with previous
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32 versions, as you only need coverage information when developing a
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33 program. We do hold version information, so that mismatches can be
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34 detected, and we use a format that allows tools to skip information
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35 they do not understand or are not interested in.
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36
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37 Numbers are recorded in the 32 bit unsigned binary form of the
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38 endianness of the machine generating the file. 64 bit numbers are
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39 stored as two 32 bit numbers, the low part first. Strings are
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40 padded with 1 to 4 NUL bytes, to bring the length up to a multiple
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41 of 4. The number of 4 bytes is stored, followed by the padded
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42 string. Zero length and NULL strings are simply stored as a length
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43 of zero (they have no trailing NUL or padding).
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44
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45 int32: byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3
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46 int64: int32:low int32:high
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47 string: int32:0 | int32:length char* char:0 padding
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48 padding: | char:0 | char:0 char:0 | char:0 char:0 char:0
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49 item: int32 | int64 | string
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50
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51 The basic format of the files is
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52
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53 file : int32:magic int32:version int32:stamp record*
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54
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55 The magic ident is different for the notes and the data files. The
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56 magic ident is used to determine the endianness of the file, when
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57 reading. The version is the same for both files and is derived
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58 from gcc's version number. The stamp value is used to synchronize
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59 note and data files and to synchronize merging within a data
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60 file. It need not be an absolute time stamp, merely a ticker that
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61 increments fast enough and cycles slow enough to distinguish
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62 different compile/run/compile cycles.
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63
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64 Although the ident and version are formally 32 bit numbers, they
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65 are derived from 4 character ASCII strings. The version number
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66 consists of a two character major version number
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67 (first digit starts from 'A' letter to not to clash with the older
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68 numbering scheme), the single character minor version number,
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69 and a single character indicating the status of the release.
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70 That will be 'e' experimental, 'p' prerelease and 'r' for release.
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71 Because, by good fortune, these are in alphabetical order, string
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72 collating can be used to compare version strings. Be aware that
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73 the 'e' designation will (naturally) be unstable and might be
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74 incompatible with itself. For gcc 17.0 experimental, it would be
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75 'B70e' (0x42373065). As we currently do not release more than 5 minor
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76 releases, the single character should be always fine. Major number
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77 is currently changed roughly every year, which gives us space
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78 for next 250 years (maximum allowed number would be 259.9).
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79
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80 A record has a tag, length and variable amount of data.
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81
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82 record: header data
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83 header: int32:tag int32:length
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84 data: item*
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85
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86 Records are not nested, but there is a record hierarchy. Tag
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87 numbers reflect this hierarchy. Tags are unique across note and
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88 data files. Some record types have a varying amount of data. The
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89 LENGTH is the number of 4bytes that follow and is usually used to
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90 determine how much data. The tag value is split into 4 8-bit
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91 fields, one for each of four possible levels. The most significant
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92 is allocated first. Unused levels are zero. Active levels are
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93 odd-valued, so that the LSB of the level is one. A sub-level
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94 incorporates the values of its superlevels. This formatting allows
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95 you to determine the tag hierarchy, without understanding the tags
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96 themselves, and is similar to the standard section numbering used
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97 in technical documents. Level values [1..3f] are used for common
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98 tags, values [41..9f] for the notes file and [a1..ff] for the data
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99 file.
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100
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101 The notes file contains the following records
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102 note: unit function-graph*
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103 unit: header int32:checksum string:source
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104 function-graph: announce_function basic_blocks {arcs | lines}*
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105 announce_function: header int32:ident
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106 int32:lineno_checksum int32:cfg_checksum
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107 string:name string:source int32:lineno
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108 basic_block: header int32:flags*
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109 arcs: header int32:block_no arc*
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110 arc: int32:dest_block int32:flags
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111 lines: header int32:block_no line*
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112 int32:0 string:NULL
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113 line: int32:line_no | int32:0 string:filename
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114
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115 The BASIC_BLOCK record holds per-bb flags. The number of blocks
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116 can be inferred from its data length. There is one ARCS record per
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117 basic block. The number of arcs from a bb is implicit from the
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118 data length. It enumerates the destination bb and per-arc flags.
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119 There is one LINES record per basic block, it enumerates the source
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120 lines which belong to that basic block. Source file names are
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121 introduced by a line number of 0, following lines are from the new
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122 source file. The initial source file for the function is NULL, but
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123 the current source file should be remembered from one LINES record
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124 to the next. The end of a block is indicated by an empty filename
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125 - this does not reset the current source file. Note there is no
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126 ordering of the ARCS and LINES records: they may be in any order,
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127 interleaved in any manner. The current filename follows the order
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128 the LINES records are stored in the file, *not* the ordering of the
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129 blocks they are for.
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130
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131 The data file contains the following records.
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132 data: {unit summary:object summary:program* function-data*}*
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133 unit: header int32:checksum
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134 function-data: announce_function present counts
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135 announce_function: header int32:ident
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136 int32:lineno_checksum int32:cfg_checksum
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137 present: header int32:present
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138 counts: header int64:count*
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139 summary: int32:checksum {count-summary}GCOV_COUNTERS_SUMMABLE
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140 count-summary: int32:num int32:runs int64:sum
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141 int64:max int64:sum_max histogram
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142 histogram: {int32:bitvector}8 histogram-buckets*
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143 histogram-buckets: int32:num int64:min int64:sum
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144
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145 The ANNOUNCE_FUNCTION record is the same as that in the note file,
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146 but without the source location. The COUNTS gives the
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147 counter values for instrumented features. The about the whole
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148 program. The checksum is used for whole program summaries, and
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149 disambiguates different programs which include the same
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150 instrumented object file. There may be several program summaries,
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151 each with a unique checksum. The object summary's checksum is
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152 zero. Note that the data file might contain information from
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153 several runs concatenated, or the data might be merged.
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154
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155 This file is included by both the compiler, gcov tools and the
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156 runtime support library libgcov. IN_LIBGCOV and IN_GCOV are used to
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157 distinguish which case is which. If IN_LIBGCOV is nonzero,
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158 libgcov is being built. If IN_GCOV is nonzero, the gcov tools are
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159 being built. Otherwise the compiler is being built. IN_GCOV may be
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160 positive or negative. If positive, we are compiling a tool that
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161 requires additional functions (see the code for knowledge of what
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162 those functions are). */
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163
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164 #ifndef GCC_GCOV_IO_H
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165 #define GCC_GCOV_IO_H
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166
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167 #ifndef IN_LIBGCOV
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168 /* About the host */
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169
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170 typedef unsigned gcov_unsigned_t;
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171 typedef unsigned gcov_position_t;
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172 /* gcov_type is typedef'd elsewhere for the compiler */
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173 #if IN_GCOV
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174 #define GCOV_LINKAGE static
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175 typedef int64_t gcov_type;
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176 typedef uint64_t gcov_type_unsigned;
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177 #if IN_GCOV > 0
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178 #include <sys/types.h>
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179 #endif
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180 #endif
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181
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182 #if defined (HOST_HAS_F_SETLKW)
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183 #define GCOV_LOCKED 1
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184 #else
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185 #define GCOV_LOCKED 0
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186 #endif
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187
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188 #define ATTRIBUTE_HIDDEN
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189
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190 #endif /* !IN_LIBGOCV */
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191
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192 #ifndef GCOV_LINKAGE
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193 #define GCOV_LINKAGE extern
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194 #endif
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195
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196 #if IN_LIBGCOV
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197 #define gcov_nonruntime_assert(EXPR) ((void)(0 && (EXPR)))
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198 #else
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199 #define gcov_nonruntime_assert(EXPR) gcc_assert (EXPR)
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200 #define gcov_error(...) fatal_error (input_location, __VA_ARGS__)
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201 #endif
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202
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203 /* File suffixes. */
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204 #define GCOV_DATA_SUFFIX ".gcda"
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205 #define GCOV_NOTE_SUFFIX ".gcno"
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206
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207 /* File magic. Must not be palindromes. */
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208 #define GCOV_DATA_MAGIC ((gcov_unsigned_t)0x67636461) /* "gcda" */
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209 #define GCOV_NOTE_MAGIC ((gcov_unsigned_t)0x67636e6f) /* "gcno" */
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210
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211 /* gcov-iov.h is automatically generated by the makefile from
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212 version.c, it looks like
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213 #define GCOV_VERSION ((gcov_unsigned_t)0x89abcdef)
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214 */
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215 #include "gcov-iov.h"
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216
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217 /* Convert a magic or version number to a 4 character string. */
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218 #define GCOV_UNSIGNED2STRING(ARRAY,VALUE) \
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219 ((ARRAY)[0] = (char)((VALUE) >> 24), \
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220 (ARRAY)[1] = (char)((VALUE) >> 16), \
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221 (ARRAY)[2] = (char)((VALUE) >> 8), \
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222 (ARRAY)[3] = (char)((VALUE) >> 0))
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223
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224 /* The record tags. Values [1..3f] are for tags which may be in either
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225 file. Values [41..9f] for those in the note file and [a1..ff] for
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226 the data file. The tag value zero is used as an explicit end of
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227 file marker -- it is not required to be present. */
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228
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229 #define GCOV_TAG_FUNCTION ((gcov_unsigned_t)0x01000000)
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230 #define GCOV_TAG_FUNCTION_LENGTH (3)
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231 #define GCOV_TAG_BLOCKS ((gcov_unsigned_t)0x01410000)
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232 #define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM)
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233 #define GCOV_TAG_ARCS ((gcov_unsigned_t)0x01430000)
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234 #define GCOV_TAG_ARCS_LENGTH(NUM) (1 + (NUM) * 2)
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235 #define GCOV_TAG_ARCS_NUM(LENGTH) (((LENGTH) - 1) / 2)
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236 #define GCOV_TAG_LINES ((gcov_unsigned_t)0x01450000)
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237 #define GCOV_TAG_COUNTER_BASE ((gcov_unsigned_t)0x01a10000)
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238 #define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2)
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239 #define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2)
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240 #define GCOV_TAG_OBJECT_SUMMARY ((gcov_unsigned_t)0xa1000000) /* Obsolete */
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241 #define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000)
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242 #define GCOV_TAG_SUMMARY_LENGTH(NUM) \
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243 (1 + GCOV_COUNTERS_SUMMABLE * (10 + 3 * 2) + (NUM) * 5)
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244 #define GCOV_TAG_AFDO_FILE_NAMES ((gcov_unsigned_t)0xaa000000)
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245 #define GCOV_TAG_AFDO_FUNCTION ((gcov_unsigned_t)0xac000000)
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246 #define GCOV_TAG_AFDO_WORKING_SET ((gcov_unsigned_t)0xaf000000)
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247
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248
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249 /* Counters that are collected. */
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250
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251 #define DEF_GCOV_COUNTER(COUNTER, NAME, MERGE_FN) COUNTER,
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252 enum {
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253 #include "gcov-counter.def"
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254 GCOV_COUNTERS
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255 };
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256 #undef DEF_GCOV_COUNTER
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257
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258 /* Counters which can be summaried. */
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259 #define GCOV_COUNTERS_SUMMABLE (GCOV_COUNTER_ARCS + 1)
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260
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261 /* The first of counters used for value profiling. They must form a
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262 consecutive interval and their order must match the order of
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263 HIST_TYPEs in value-prof.h. */
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264 #define GCOV_FIRST_VALUE_COUNTER GCOV_COUNTERS_SUMMABLE
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265
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266 /* The last of counters used for value profiling. */
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267 #define GCOV_LAST_VALUE_COUNTER (GCOV_COUNTERS - 1)
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268
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269 /* Number of counters used for value profiling. */
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270 #define GCOV_N_VALUE_COUNTERS \
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271 (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1)
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272
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273 /* The number of hottest callees to be tracked. */
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274 #define GCOV_ICALL_TOPN_VAL 2
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275
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276 /* The number of counter entries per icall callsite. */
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277 #define GCOV_ICALL_TOPN_NCOUNTS (1 + GCOV_ICALL_TOPN_VAL * 4)
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278
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279 /* Convert a counter index to a tag. */
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280 #define GCOV_TAG_FOR_COUNTER(COUNT) \
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281 (GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17))
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282 /* Convert a tag to a counter. */
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283 #define GCOV_COUNTER_FOR_TAG(TAG) \
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284 ((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17))
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285 /* Check whether a tag is a counter tag. */
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286 #define GCOV_TAG_IS_COUNTER(TAG) \
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287 (!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS)
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288
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289 /* The tag level mask has 1's in the position of the inner levels, &
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290 the lsb of the current level, and zero on the current and outer
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291 levels. */
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292 #define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG))
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293
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294 /* Return nonzero if SUB is an immediate subtag of TAG. */
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295 #define GCOV_TAG_IS_SUBTAG(TAG,SUB) \
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296 (GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB) \
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297 && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK (TAG)))
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298
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299 /* Return nonzero if SUB is at a sublevel to TAG. */
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300 #define GCOV_TAG_IS_SUBLEVEL(TAG,SUB) \
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301 (GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB))
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302
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303 /* Basic block flags. */
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304 #define GCOV_BLOCK_UNEXPECTED (1 << 1)
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305
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306 /* Arc flags. */
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307 #define GCOV_ARC_ON_TREE (1 << 0)
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308 #define GCOV_ARC_FAKE (1 << 1)
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309 #define GCOV_ARC_FALLTHROUGH (1 << 2)
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310
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311 /* Structured records. */
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312
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313 /* Structure used for each bucket of the log2 histogram of counter values. */
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314 typedef struct
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315 {
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316 /* Number of counters whose profile count falls within the bucket. */
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317 gcov_unsigned_t num_counters;
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318 /* Smallest profile count included in this bucket. */
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319 gcov_type min_value;
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320 /* Cumulative value of the profile counts in this bucket. */
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321 gcov_type cum_value;
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322 } gcov_bucket_type;
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323
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324 /* For a log2 scale histogram with each range split into 4
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325 linear sub-ranges, there will be at most 64 (max gcov_type bit size) - 1 log2
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326 ranges since the lowest 2 log2 values share the lowest 4 linear
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327 sub-range (values 0 - 3). This is 252 total entries (63*4). */
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328
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329 #define GCOV_HISTOGRAM_SIZE 252
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330
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331 /* How many unsigned ints are required to hold a bit vector of non-zero
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332 histogram entries when the histogram is written to the gcov file.
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333 This is essentially a ceiling divide by 32 bits. */
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334 #define GCOV_HISTOGRAM_BITVECTOR_SIZE (GCOV_HISTOGRAM_SIZE + 31) / 32
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335
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336 /* Cumulative counter data. */
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337 struct gcov_ctr_summary
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338 {
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339 gcov_unsigned_t num; /* number of counters. */
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340 gcov_unsigned_t runs; /* number of program runs */
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341 gcov_type sum_all; /* sum of all counters accumulated. */
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342 gcov_type run_max; /* maximum value on a single run. */
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343 gcov_type sum_max; /* sum of individual run max values. */
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344 gcov_bucket_type histogram[GCOV_HISTOGRAM_SIZE]; /* histogram of
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345 counter values. */
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346 };
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347
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348 /* Object & program summary record. */
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349 struct gcov_summary
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350 {
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351 gcov_unsigned_t checksum; /* checksum of program */
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352 struct gcov_ctr_summary ctrs[GCOV_COUNTERS_SUMMABLE];
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353 };
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354
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355 #if !defined(inhibit_libc)
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356
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357 /* Functions for reading and writing gcov files. In libgcov you can
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358 open the file for reading then writing. Elsewhere you can open the
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359 file either for reading or for writing. When reading a file you may
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360 use the gcov_read_* functions, gcov_sync, gcov_position, &
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361 gcov_error. When writing a file you may use the gcov_write
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362 functions, gcov_seek & gcov_error. When a file is to be rewritten
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363 you use the functions for reading, then gcov_rewrite then the
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364 functions for writing. Your file may become corrupted if you break
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365 these invariants. */
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366
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367 #if !IN_LIBGCOV
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368 GCOV_LINKAGE int gcov_open (const char */*name*/, int /*direction*/);
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369 GCOV_LINKAGE int gcov_magic (gcov_unsigned_t, gcov_unsigned_t);
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370 #endif
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371
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372 /* Available everywhere. */
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373 GCOV_LINKAGE int gcov_close (void) ATTRIBUTE_HIDDEN;
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374 GCOV_LINKAGE gcov_unsigned_t gcov_read_unsigned (void) ATTRIBUTE_HIDDEN;
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375 GCOV_LINKAGE gcov_type gcov_read_counter (void) ATTRIBUTE_HIDDEN;
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376 GCOV_LINKAGE void gcov_read_summary (struct gcov_summary *) ATTRIBUTE_HIDDEN;
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377 GCOV_LINKAGE const char *gcov_read_string (void);
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378 GCOV_LINKAGE void gcov_sync (gcov_position_t /*base*/,
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379 gcov_unsigned_t /*length */);
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380
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381 #if !IN_GCOV
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382 /* Available outside gcov */
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383 GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t) ATTRIBUTE_HIDDEN;
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384 #endif
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385
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386 #if !IN_GCOV && !IN_LIBGCOV
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387 /* Available only in compiler */
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388 GCOV_LINKAGE unsigned gcov_histo_index (gcov_type value);
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389 GCOV_LINKAGE void gcov_write_string (const char *);
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390 GCOV_LINKAGE void gcov_write_filename (const char *);
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391 GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t);
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392 GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/);
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393 #endif
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394
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395 #if IN_GCOV <= 0 && !IN_LIBGCOV
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396 /* Available in gcov-dump and the compiler. */
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397
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398 /* Number of data points in the working set summary array. Using 128
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399 provides information for at least every 1% increment of the total
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400 profile size. The last entry is hardwired to 99.9% of the total. */
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401 #define NUM_GCOV_WORKING_SETS 128
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402
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403 /* Working set size statistics for a given percentage of the entire
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404 profile (sum_all from the counter summary). */
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405 typedef struct gcov_working_set_info
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406 {
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407 /* Number of hot counters included in this working set. */
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408 unsigned num_counters;
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409 /* Smallest counter included in this working set. */
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410 gcov_type min_counter;
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411 } gcov_working_set_t;
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412
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413 GCOV_LINKAGE void compute_working_sets (const struct gcov_ctr_summary *summary,
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414 gcov_working_set_t *gcov_working_sets);
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415 #endif
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416
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417 #if IN_GCOV > 0
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418 /* Available in gcov */
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419 GCOV_LINKAGE time_t gcov_time (void);
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420 #endif
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421
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422 #endif /* !inhibit_libc */
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423
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424 #endif /* GCC_GCOV_IO_H */