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# Pass bisection
This document describes a feature for the bisection tool, which provides
pass and transformation level bisection for a bad object file.
Before reading this document, please refer to README.bisect for general usage
of the bisection tool.
The benefit of using pass level bisection is:
When building a bad object file, it can tell you which pass and transformation
in the compiler caused the error.
*Notice:* This tool will only work for LLVM/clang, since it is using options
`-opt-bisect-limit` and `print-debug-counter` that only exist in LLVM.
## Arguments
All the required arguments in object-file-level bisection tool are still
to be provided. In addition, you will need to add the following arguments:
1. `--pass_bisect`: enables pass level bisection
2. `--ir_diff`: enables output of IR differences
Please refer to `--help` or the examples below for details about how to use
them.
## HOW TO USE: ChromeOS
*TODO* - Future work: Currently this only works for Android.
## HOW TO USE: Android
1. Prerequisites: A general setup is still needed for Android, which means that
you need to populate good and bad set of objects with two versions of
compilers.
See the documentation in `README.bisect.md` for more detailed instructions.
1. Pass/Transformation Bisection: If you do not wish to override the other
arguments, this command should be sufficient to do pass/transformation level
bisection:
```
./run_bisect.py android PATH_TO_ANDROID_HOME_DIR
--pass_bisect=’android/generate_cmd.sh’
--prune=False
--ir_diff
--verbose
```
Where:
```
--pass_bisect:
Enables pass/transformation level bisection and with default
script to generate the command as ‘android/generate_cmd.sh’.
--prune:
For now, prune must be set to False to return only the first
bad item.
--ir_diff:
Optional argument to print out IR differences.
--verbose:
To show IR diff, verbose needs to be on.
```
Other default arguments:
```
--get_initial_items='android/get_initial_items.sh'
--switch_to_good='android/switch_to_good.sh'
--switch_to_bad='android/switch_to_bad.sh'
--test_setup_script='android/test_setup.sh'
--test_script='android/interactive_test.sh'
--incremental
--prune
--file_args
```
You can always override them if needed. See README.bisect for more
details.
1. Other features: Features such as resuming, number of jobs, and device id
remain the same as before. See README.bisect for more details.
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