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WALA Delta

WALA Delta is a delta debugger for WALA-based JavaScript analyses. It is based on the JS Delta package, and provides additional support specifically for debugging analyses using the WALA libraries.

NOTE: As of version 0.2.0, WALA Delta no longer includes generic delta debugging functionality, which has been factored out into the new JS Delta package. If you are using WALA Delta in a scenario independent of core WALA, you may consider using JS Delta instead.

Installation

In the root directory of your checkout, invoke

npm install

to install the jsdelta module, which is currently the only dependency of WALADelta.

Usage

WALA Delta provides a number of utility scripts to use with JS Delta. See the documentation of JS Delta for more general information on how test case minimization by delta debugging works.

Several predicates are provided for use with WALA's call-graph builder for JavaScript:

analysis_timeout.js checks whether the WALA analysis completes within a given timeout.
analysis_error.js checks if the WALA analysis terminates with a particular error message.
analysis_reachable.js checks if the WALA analysis deems a specified method to be reachable.

To use these predicates, first save the wala_paths-example.js file as wala_paths.js and edit the paths appropriately to point to the root directory of your WALA workspace and the plugins directory of your Eclipse installation.

Variable classpath in wala_runner.js specifies which JARs to put into the classpath when invoking WALA. It uses the paths specified in wala_paths.js and should work out of the box with Eclipse 3.6. For other versions, you'll most likely have to adjust the names of the org.eclipse.equinox.common, org.eclipse.core.runtime, and org.eclipse.osgi JARs.

Once you are done, the WALA predicates can be invoked like this:

node node_modules/jsdelta/delta.js file-to-reduce.js ./analysis_timeout.js

License

WALA Delta is distributed under the Eclipse Public License. See the LICENSE.txt file in the root directory or <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a>.