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Precision-guided context sensitivity for pointer analysis

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This is the implementation of the techniques called ZIPPER and ZIPPER-e. ZIPPER is proposed in our OOPSLA'18 paper "[Precision-Guided Context Sensitivity for Pointer Analysis](https://silverbullettt.bitbucket.io/papers/oopsla2018.pdf)", which is the first research work that shows how and where most imprecision is introduced in a context-insensitive pointer analysis. By applying context sensitivity only to the precision-critical methods identified by ZIPPER (context insensitivity to other methods), ZIPPER enables a conventional context-sensitive pointer analysis (e.g., 2-object-sensitivity) to run much faster while retaining essentially all of its precision.
The artifact of our paper can be downloaded from [here](http://www.brics.dk/zipper/OOPSLA18-Artifact-Zipper.tar.gz).

Based on ZIPPER, we proposed ZIPPER-e (short for ZIPPER-express) in our TOPLAS'20 paper "[A Principled Approach to Selective Context Sensitivity for Pointer Analysis](https://silverbullettt.bitbucket.io/papers/toplas2020.pdf)", which exhibits extremely good efficiency with high precision.

**Note: Now we have integrated both ZIPPER and ZIPPER-e in [Tai-e](https://github.com/pascal-lab/Tai-e), an easy-to-learn/use static analysis framework for Java. We recommend you using ZIPPER/ZIPPER-e in [Tai-e](https://github.com/pascal-lab/Tai-e).**

To demonstrate the usefulness of ZIPPER and ZIPPER-e to pointer analysis, we have integrated them with [DOOP](https://bitbucket.org/yanniss/doop) ([PLDI'14 artifact version](http://cgi.di.uoa.gr/~smaragd/pldi14ae/pldi14-ae.tgz)), a state-of-the-art context-sensitive points-to analysis framework for Java. For your convenience, this repository also contains the DOOP framework with ZIPPER and ZIPPER-e integrated.

This tutorial introduces how to build and use ZIPPER and ZIPPER-e together with DOOP.

## Requirements

- A 64-bit Ubuntu system
- A Java 8 distribution
- A Python 2.x interpreter

Please set your `JAVA_HOME` environment variable to point to your Java installation directory.

## Building ZIPPER and ZIPPER-e

We have provided a pre-compiled jar of ZIPPER and ZIPPER-e, i.e., `zipper.jar` (this jar also includes ZIPPER-e) in the directory `zipper/build/`. To build them by yourself, you just need to switch to the `zipper/` directory and run script:

`$ ./compile.sh`

The generated `zipper.jar` will be placed in `zipper/build/` and overwrite the previous one.

## DOOP Framework

Now we introduce how to use DOOP together with ZIPPER and ZIPPER-e.

### Installing Datalog Engine

To run DOOP framework, you need to install a LogicBlox engine for interpreting the Datalog rules used in DOOP. If you already have such engine installed (e.g., LogicBlox v3.9.0), you can skip this section. Otherwise, you can use PA-Datalog engine, a port available for academic use. The download link and installation instructions of PA-Datalog can be found on [this page](http://snf-705535.vm.okeanos.grnet.gr/agreement.html) (We recommend `.deb` package installation).

### Running DOOP

Please first change your current directory to `doop/` folder.

The command of running DOOP is:

`$ ./run -jre1.6 <analysis> <program-jar-to-analyze>`

For example, to analyze `foo.jar` with 2-object-sensitive analysis, just type:

`$ ./run -jre1.6 2-object-sensitive+heap foo.jar`

You can check all the supported `<analysis>` and other options with `./run -h`.

### Running DOOP with ZIPPER

The usage of running ZIPPER-guided pointer analysis is exactly same as the DOOP's usage, except that you need to change the driver script from `run` to `run-zipper.py`.

For example, the command to run ZIPPER-guided 2-object-sensitive analysis for `foo.jar` is:

`$ ./run-zipper.py -jre1.6 2-object-sensitive+heap foo.jar`

Such command first runs a context-insensitive pointer analysis as pre-analysis, then executes ZIPPER to compute and output precision-critical methods, and finally runs the main analysis (`2-object-sensitive+heap` in this case), which applies context sensitivity to only the precision-critical methods output by ZIPPER.

### Running DOOP with ZIPPER-e

To guide pointer analysis by ZIPPER-e, you just need to add option `-e` when running `run-zipper.py`.

For example, the command to run ZIPPER-e-guided 2-object-sensitive analysis for `foo.jar` is:

`$ ./run-zipper.py -e -jre1.6 2-object-sensitive+heap foo.jar`

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