bugpoint - automatic test case reduction tool
bugpoint [options] [input LLVM ll/bc files] [LLVM passes] --args
bugpoint narrows down the source of problems in LLVM tools and passes.
It can be used to debug three types of failures: optimizer crashes,
miscompilations by optimizers, or bad native code generation (including
problems in the static and JIT compilers). It aims to reduce large
test cases to small, useful ones. For more information on the design
and inner workings of bugpoint, as well as advice for using bugpoint,
see llvm/docs/Bugpoint.html in the LLVM distribution.
Load the dynamic shared object library into the test program
whenever it is run. This is useful if you are debugging programs
which depend on non-LLVM libraries (such as the X or curses
libraries) to run.
Append the test programs exit code to the output file so that a
change in exit code is considered a test failure. Defaults to
--args program args
Pass all arguments specified after -args to the test program
whenever it runs. Note that if any of the program args start with
a '-', you should use:
bugpoint [bugpoint args] --args -- [program args]
The "--" right after the --args option tells bugpoint to consider
any options starting with "-" to be part of the --args option, not
as options to bugpoint itself.
--tool-args tool args
Pass all arguments specified after --tool-args to the LLVM tool
under test (llc, lli, etc.) whenever it runs. You should use this
option in the following way:
bugpoint [bugpoint args] --tool-args -- [tool args]
The "--" right after the --tool-args option tells bugpoint to
consider any options starting with "-" to be part of the
--tool-args option, not as options to bugpoint itself. (See --args,
--safe-tool-args tool args
Pass all arguments specified after --safe-tool-args to the "safe"
--gcc-tool-args gcc tool args
Pass all arguments specified after --gcc-tool-args to the
invocation of gcc.
--opt-args opt args
Pass all arguments specified after --opt-args to the invocation of
Do not run the specified passes to clean up and reduce the size of
the test program. By default, bugpoint uses these passes internally
when attempting to reduce test programs. If you're trying to find
a bug in one of these passes, bugpoint may crash.
Use valgrind to find faults in the optimization phase. This will
allow bugpoint to find otherwise asymptomatic problems caused by
Continually randomize the specified passes and run them on the test
program until a bug is found or the user kills bugpoint.
Print a summary of command line options.
Open filename and redirect the standard input of the test program,
whenever it runs, to come from that file.
Load the dynamic object plugin into bugpoint itself. This object
should register new optimization passes. Once loaded, the object
will add new command line options to enable various optimizations.
To see the new complete list of optimizations, use the -help and
--load options together; for example:
bugpoint --load myNewPass.so -help
Specifies an upper limit on memory usage of the optimization and
codegen. Set to zero to disable the limit.
Whenever the test program produces output on its standard output
stream, it should match the contents of filename (the "reference
output"). If you do not use this option, bugpoint will attempt to
generate a reference output by compiling the program with the
"safe" backend and running it.
Profile file loaded by --profile-loader.
Whenever the test program is compiled, bugpoint should generate
code for it using the specified code generator. These options
allow you to choose the interpreter, the JIT compiler, the static
native code compiler, the C backend, or a custom command (see
When debugging a code generator, bugpoint should use the specified
code generator as the "safe" code generator. This is a known-good
code generator used to generate the "reference output" if it has
not been provided, and to compile portions of the program that as
they are excluded from the testcase. These options allow you to
choose the static native code compiler, the C backend, or a custom
command, (see --exec-command) respectively. The interpreter and the
JIT backends cannot currently be used as the "safe" backends.
This option defines the command to use with the --run-custom and
--safe-custom options to execute the bitcode testcase. This can be
useful for cross-compilation.
This option defines the path to the command to execute with the
If bugpoint succeeds in finding a problem, it will exit with 0.
Otherwise, if an error occurs, it will exit with a non-zero value.
Maintained by the LLVM Team (<http://llvm.org>).