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annotate docs/CommandGuide/bugpoint.rst @ 124:4fa72497ed5d

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author mir3636
date Thu, 30 Nov 2017 20:04:56 +0900
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1 bugpoint - automatic test case reduction tool
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2 =============================================
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3
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4 SYNOPSIS
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5 --------
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6
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7 **bugpoint** [*options*] [*input LLVM ll/bc files*] [*LLVM passes*] **--args**
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8 *program arguments*
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9
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10 DESCRIPTION
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11 -----------
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12
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13 **bugpoint** narrows down the source of problems in LLVM tools and passes. It
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14 can be used to debug three types of failures: optimizer crashes, miscompilations
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15 by optimizers, or bad native code generation (including problems in the static
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16 and JIT compilers). It aims to reduce large test cases to small, useful ones.
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17 For more information on the design and inner workings of **bugpoint**, as well as
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18 advice for using bugpoint, see :doc:`/Bugpoint` in the LLVM
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19 distribution.
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20
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21 OPTIONS
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22 -------
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23
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24 **--additional-so** *library*
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25
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26 Load the dynamic shared object *library* into the test program whenever it is
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27 run. This is useful if you are debugging programs which depend on non-LLVM
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28 libraries (such as the X or curses libraries) to run.
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29
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30 **--append-exit-code**\ =\ *{true,false}*
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31
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32 Append the test programs exit code to the output file so that a change in exit
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33 code is considered a test failure. Defaults to false.
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34
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35 **--args** *program args*
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36
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37 Pass all arguments specified after **--args** to the test program whenever it runs.
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38 Note that if any of the *program args* start with a "``-``", you should use:
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39
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40 .. code-block:: bash
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41
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42 bugpoint [bugpoint args] --args -- [program args]
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43
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44 The "``--``" right after the **--args** option tells **bugpoint** to consider
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45 any options starting with "``-``" to be part of the **--args** option, not as
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46 options to **bugpoint** itself.
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47
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48 **--tool-args** *tool args*
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49
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50 Pass all arguments specified after **--tool-args** to the LLVM tool under test
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51 (**llc**, **lli**, etc.) whenever it runs. You should use this option in the
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52 following way:
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53
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54 .. code-block:: bash
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55
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56 bugpoint [bugpoint args] --tool-args -- [tool args]
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57
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58 The "``--``" right after the **--tool-args** option tells **bugpoint** to
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59 consider any options starting with "``-``" to be part of the **--tool-args**
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60 option, not as options to **bugpoint** itself. (See **--args**, above.)
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61
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62 **--safe-tool-args** *tool args*
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63
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64 Pass all arguments specified after **--safe-tool-args** to the "safe" execution
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65 tool.
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66
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67 **--gcc-tool-args** *gcc tool args*
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68
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69 Pass all arguments specified after **--gcc-tool-args** to the invocation of
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70 **gcc**.
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71
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72 **--opt-args** *opt args*
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73
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74 Pass all arguments specified after **--opt-args** to the invocation of **opt**.
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75
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76 **--disable-{dce,simplifycfg}**
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77
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78 Do not run the specified passes to clean up and reduce the size of the test
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79 program. By default, **bugpoint** uses these passes internally when attempting to
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80 reduce test programs. If you're trying to find a bug in one of these passes,
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81 **bugpoint** may crash.
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82
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83 **--enable-valgrind**
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84
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85 Use valgrind to find faults in the optimization phase. This will allow
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86 bugpoint to find otherwise asymptomatic problems caused by memory
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87 mis-management.
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88
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89 **-find-bugs**
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90
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91 Continually randomize the specified passes and run them on the test program
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92 until a bug is found or the user kills **bugpoint**.
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93
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94 **-help**
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95
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96 Print a summary of command line options.
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97
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98 **--input** *filename*
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99
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100 Open *filename* and redirect the standard input of the test program, whenever
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101 it runs, to come from that file.
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102
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103 **--load** *plugin*
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104
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105 Load the dynamic object *plugin* into **bugpoint** itself. This object should
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106 register new optimization passes. Once loaded, the object will add new command
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107 line options to enable various optimizations. To see the new complete list of
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108 optimizations, use the **-help** and **--load** options together; for example:
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109
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110
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111 .. code-block:: bash
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112
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113 bugpoint --load myNewPass.so -help
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114
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115 **--mlimit** *megabytes*
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116
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117 Specifies an upper limit on memory usage of the optimization and codegen. Set
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118 to zero to disable the limit.
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119
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120 **--output** *filename*
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121
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122 Whenever the test program produces output on its standard output stream, it
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123 should match the contents of *filename* (the "reference output"). If you
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124 do not use this option, **bugpoint** will attempt to generate a reference output
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125 by compiling the program with the "safe" backend and running it.
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126
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127 **--run-{int,jit,llc,custom}**
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128
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129 Whenever the test program is compiled, **bugpoint** should generate code for it
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130 using the specified code generator. These options allow you to choose the
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131 interpreter, the JIT compiler, the static native code compiler, or a
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132 custom command (see **--exec-command**) respectively.
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133
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134 **--safe-{llc,custom}**
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135
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136 When debugging a code generator, **bugpoint** should use the specified code
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137 generator as the "safe" code generator. This is a known-good code generator
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138 used to generate the "reference output" if it has not been provided, and to
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139 compile portions of the program that as they are excluded from the testcase.
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140 These options allow you to choose the
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141 static native code compiler, or a custom command, (see **--exec-command**)
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142 respectively. The interpreter and the JIT backends cannot currently
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143 be used as the "safe" backends.
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144
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145 **--exec-command** *command*
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146
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147 This option defines the command to use with the **--run-custom** and
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148 **--safe-custom** options to execute the bitcode testcase. This can
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149 be useful for cross-compilation.
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150
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151 **--compile-command** *command*
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152
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153 This option defines the command to use with the **--compile-custom**
120
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154 option to compile the bitcode testcase. The command should exit with a
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155 failure exit code if the file is "interesting" and should exit with a
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156 success exit code (i.e. 0) otherwise (this is the same as if it crashed on
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157 "interesting" inputs).
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158
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159 This can be useful for
0
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160 testing compiler output without running any link or execute stages. To
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161 generate a reduced unit test, you may add CHECK directives to the
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162 testcase and pass the name of an executable compile-command script in this form:
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163
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164 .. code-block:: sh
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165
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166 #!/bin/sh
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167 llc "$@"
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168 not FileCheck [bugpoint input file].ll < bugpoint-test-program.s
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169
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170 This script will "fail" as long as FileCheck passes. So the result
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171 will be the minimum bitcode that passes FileCheck.
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172
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173 **--safe-path** *path*
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174
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175 This option defines the path to the command to execute with the
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176 **--safe-{int,jit,llc,custom}**
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177 option.
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178
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179 **--verbose-errors**\ =\ *{true,false}*
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180
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181 The default behavior of bugpoint is to print "<crash>" when it finds a reduced
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182 test that crashes compilation. This flag prints the output of the crashing
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183 program to stderr. This is useful to make sure it is the same error being
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184 tracked down and not a different error that happens to crash the compiler as
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185 well. Defaults to false.
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186
0
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187 EXIT STATUS
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188 -----------
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189
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190 If **bugpoint** succeeds in finding a problem, it will exit with 0. Otherwise,
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191 if an error occurs, it will exit with a non-zero value.
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192
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193 SEE ALSO
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194 --------
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195
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196 opt|opt