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.
–append-exit-code={true,false}
Append the test programs exit code to the output file so
that a change in exit code is considered a test failure. Defaults to
false.
–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.)
–safe-tool-args tool args
Pass all arguments specified after
–safe-tool-args to the “safe” execution
tool.
–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 opt.
–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 “safe” backend and running it.
–run-{int,jit,llc,custom}
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 a custom command (see –exec-command)
respectively.
–safe-{llc,custom}
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, or a custom command, (see
–exec-command) respectively. The interpreter and the JIT
backends cannot currently be used as the “safe” backends.
–exec-command command
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.
–compile-command command
This option defines the command to use with the
–compile-custom option to compile the bitcode testcase. The
command should exit with a failure exit code if the file is
“interesting” and should exit with a success exit code (i.e. 0)
otherwise (this is the same as if it crashed on “interesting”
inputs).
This can be useful for testing compiler output without running any
link or execute stages. To generate a reduced unit test, you may add CHECK
directives to the testcase and pass the name of an executable
compile-command script in this form:
#!/bin/sh
llc "$@"
not FileCheck [bugpoint input file].ll < bugpoint-test-program.s
This script will “fail” as long as FileCheck passes.
So the result will be the minimum bitcode that passes FileCheck.
–safe-path path
This option defines the path to the command to execute
with the –safe-{int,jit,llc,custom} option.
–verbose-errors={true,false}
The default behavior of bugpoint is to print
“<crash>” when it finds a reduced test that crashes
compilation. This flag prints the output of the crashing program to stderr.
This is useful to make sure it is the same error being tracked down and not a
different error that happens to crash the compiler as well. Defaults to
false.
