1BUGPOINT(1)                          LLVM                          BUGPOINT(1)
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NAME

6       bugpoint - automatic test case reduction tool
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SYNOPSIS

9       bugpoint  [options]  [input LLVM ll/bc files] [LLVM passes] --args pro‐
10       gram arguments
11

DESCRIPTION

13       bugpoint narrows down the source of problems in LLVM tools and  passes.
14       It  can  be  used  to debug three types of failures: optimizer crashes,
15       miscompilations by optimizers, or bad native code generation (including
16       problems  in  the  static  and JIT compilers).  It aims to reduce large
17       test cases to small, useful ones.  For more information on  the  design
18       and  inner  workings of bugpoint, as well as advice for using bugpoint,
19       see /Bugpoint in the LLVM distribution.
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OPTIONS

22       --additional-so library
23          Load the dynamic shared object library into the test  program  when‐
24          ever  it is run.  This is useful if you are debugging programs which
25          depend on non-LLVM libraries (such as the X or curses libraries)  to
26          run.
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28       --append-exit-code={true,false}
29          Append  the  test  programs  exit  code to the output file so that a
30          change in exit code is considered a test failure. Defaults to false.
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32       --args program args
33          Pass all arguments specified after --args to the test program  when‐
34          ever  it  runs.   Note  that if any of the program args start with a
35          "-", you should use:
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37              bugpoint [bugpoint args] --args -- [program args]
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39          The "--" right after the --args option tells  bugpoint  to  consider
40          any  options  starting with "-" to be part of the --args option, not
41          as options to bugpoint itself.
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43       --tool-args tool args
44          Pass all arguments specified after --tool-args to the LLVM tool  un‐
45          der test (llc, lli, etc.) whenever it runs.  You should use this op‐
46          tion in the following way:
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48              bugpoint [bugpoint args] --tool-args -- [tool args]
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50          The "--" right after the --tool-args option tells bugpoint  to  con‐
51          sider  any  options  starting with "-" to be part of the --tool-args
52          option, not as options to bugpoint itself. (See --args, above.)
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54       --safe-tool-args tool args
55          Pass all arguments specified after --safe-tool-args  to  the  "safe"
56          execution tool.
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58       --gcc-tool-args gcc tool args
59          Pass all arguments specified after --gcc-tool-args to the invocation
60          of gcc.
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62       --opt-args opt args
63          Pass all arguments specified after --opt-args to the  invocation  of
64          opt.
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66       --disable-{dce,simplifycfg}
67          Do  not  run the specified passes to clean up and reduce the size of
68          the test program. By default, bugpoint uses these passes  internally
69          when attempting to reduce test programs.  If you're trying to find a
70          bug in one of these passes, bugpoint may crash.
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72       --enable-valgrind
73          Use valgrind to find faults in the optimization phase. This will al‐
74          low  bugpoint to find otherwise asymptomatic problems caused by mem‐
75          ory mis-management.
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77       -find-bugs
78          Continually randomize the specified passes and run them on the  test
79          program until a bug is found or the user kills bugpoint.
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81       -help
82          Print a summary of command line options.
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84       --input filename
85          Open  filename  and redirect the standard input of the test program,
86          whenever it runs, to come from that file.
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88       --load plugin
89          Load the dynamic object plugin into bugpoint  itself.   This  object
90          should  register  new  optimization passes.  Once loaded, the object
91          will add new command line options to enable  various  optimizations.
92          To  see  the  new  complete list of optimizations, use the -help and
93          --load options together; for example:
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95              bugpoint --load myNewPass.so -help
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97       --mlimit megabytes
98          Specifies an upper limit on memory usage  of  the  optimization  and
99          codegen. Set to zero to disable the limit.
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101       --output filename
102          Whenever  the  test  program  produces output on its standard output
103          stream, it should match the contents  of  filename  (the  "reference
104          output").  If  you  do not use this option, bugpoint will attempt to
105          generate a reference output by compiling the program with the "safe"
106          backend and running it.
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108       --run-{int,jit,llc,custom}
109          Whenever the test program is compiled, bugpoint should generate code
110          for it using the specified code generator.  These options allow  you
111          to  choose the interpreter, the JIT compiler, the static native code
112          compiler, or a custom command (see --exec-command) respectively.
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114       --safe-{llc,custom}
115          When debugging a code generator, bugpoint should use  the  specified
116          code  generator  as  the "safe" code generator. This is a known-good
117          code generator used to generate the "reference output" if it has not
118          been  provided,  and to compile portions of the program that as they
119          are excluded from the testcase.  These options allow you  to  choose
120          the   static  native  code  compiler,  or  a  custom  command,  (see
121          --exec-command) respectively. The interpreter and the  JIT  backends
122          cannot currently be used as the "safe" backends.
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124       --exec-command command
125          This  option  defines  the  command to use with the --run-custom and
126          --safe-custom options to execute the bitcode testcase. This  can  be
127          useful for cross-compilation.
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129       --compile-command command
130          This option defines the command to use with the --compile-custom op‐
131          tion to compile the bitcode testcase. The command should exit with a
132          failure  exit code if the file is "interesting" and should exit with
133          a success exit code (i.e. 0) otherwise (this is the same  as  if  it
134          crashed on "interesting" inputs).
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136          This  can  be useful for testing compiler output without running any
137          link or execute stages. To generate a reduced unit test, you may add
138          CHECK  directives to the testcase and pass the name of an executable
139          compile-command script in this form:
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141              #!/bin/sh
142              llc "$@"
143              not FileCheck [bugpoint input file].ll < bugpoint-test-program.s
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145          This script will "fail" as long as FileCheck passes. So  the  result
146          will be the minimum bitcode that passes FileCheck.
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148       --safe-path path
149          This  option  defines  the  path  to the command to execute with the
150          --safe-{int,jit,llc,custom} option.
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152       --verbose-errors={true,false}
153          The default behavior of bugpoint is to print "<crash>" when it finds
154          a reduced test that crashes compilation. This flag prints the output
155          of the crashing program to stderr. This is useful to make sure it is
156          the  same  error  being  tracked down and not a different error that
157          happens to crash the compiler as well. Defaults to false.
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EXIT STATUS

160       If bugpoint succeeds in finding a problem, it will exit with 0.  Other‐
161       wise, if an error occurs, it will exit with a non-zero value.
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SEE ALSO

164       opt|opt
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AUTHOR

167       Maintained by The LLVM Team (http://llvm.org/).
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170       2003-2021, LLVM Project
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1757                                 2021-07-22                       BUGPOINT(1)
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