NAME

bugpoint - automatic test case reduction tool

SYNOPSIS

bugpoint [options] [input LLVM ll/bc files] [LLVM passes] --args program arguments

DESCRIPTION

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.

OPTIONS

--additional-so library

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.

--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, above.)

--check-exit-code={true,false}

Assume a non-zero exit code or core dump from the test program is a failure. Defaults to true.

--disable-{dce,simplifycfg}

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.

--enable-valgrind

Use valgrind to find faults in the optimization phase. This will allow bugpoint to find otherwise asymptomatic problems caused by memory mis-management.

-find-bugs

Continually randomize the specified passes and run them on the test program until a bug is found or the user kills bugpoint.

--help

Print a summary of command line options.

--input filename

Open filename and redirect the standard input of the test program, whenever it runs, to come from that file.

--load plugin

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

--mlimit megabytes

Specifies an upper limit on memory usage of the optimization and codegen. Set to zero to disable the limit.

--output filename

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 C backend and running it.

--profile-info-file filename

Profile file loaded by --profile-loader.

--run-{int,jit,llc,cbe}

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, or the C backend, respectively.

EXIT STATUS

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.

AUTHOR