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MultiLingual Static Analysis (MLSA, pronounced Melissa for convenience) is a tool that analyzes software that is written in multiple languages and in which the languages call each other. The objective is to provide open-source tools that help analyze the way multilingual code inter-operates to address security issues, software design and refacto…
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MLSA Installation & Use Instructions

When the MLSA project is cloned it will produce a folder with the following subfolders.
* Bin  contains python code implementing MLSA filter programs and MLSA pipelines.
* Doc  contains MLSA documentation
* Test contains the program and test folders test0 through test5 that can be used to determine a correct installation
* Examples contains C/C++, Python and JavaScript subfolders with various programs downloaded from the web to evaluate MLSA.

To run MLSA you will need to have installed the following prerequisites
1.	Clang 3.8 
2.	Python 2.7
3.	SpiderMonkey 2.4 
4.	DOT (Graphviz) 2.38
5.	ps2pdf
6.	Evince or other PDF viewer
7.	Bash shell 

All MLSA testing was done using Ubuntu. Clang, Python, SpiderMonkey (js24) and Graphviz can be installed on Ubuntu using "sudo apt-get install". 

Once you have installed these, you can test whether your MLSA installation works by cd-ing to the test folder and invoking the program. As a first step, cd to the top level mlsa directory. In that directory, do "source mlsapath.bash" to add yourinstallation/mlsa/bin to your executable path. 

Next, cd to the test folder. All calls to will automatically diff the results generated with the correct results and report the differences in a text file called testN_stats.txt where N is the argument given to the program:
1.	./ 0  will test the C function call generator. 
2.	./ 1  will test the C control flow, assignment collector and RDA pipeline.
3.	./ 2  will test the Python function call generator.
4.	./ 3  will test the multilingual Python and C functional call pipeline.
5.	./ 4  will test the Javascript function generator.
6.	./ 5  will test the multilingual Python, C and Javascript pipeline

If you get no differences reported for all these, then your MLSA installation is operating correctly and you can go ahead and use MLSA! 
A good place to start is with the program in bin. This program will invoke the multilingual call graph pipeline on the programs and/or folders you give it as argument. For example, in the MLSA mlsa/test folder if you type: test0

Then the multlingual pipeline is called for all the (C/C++, Python or Javascript) programs in test0 and a single call graph generated. Procedure calling between files in the same and different languages will be identified (for the limited set of interoperability calls that have been implemented) and the call graph will reflect this, but programs with no procedure calls in common are fine too. The resulting call graph is a forest of trees. Recursion is flagged after one full cycle and several other kind of interlanguage calls are flagged also.
To get deeper into MLSA you will need to know more about the individual filter programs and pipelines that have been implemented. You can also build new pipelines or add new filters.

MLSA Open Source Static Analysis Tools

Call Graph Tools

- generate monolingual call graphs for Python, Javascript and C/C++ (and some Objective C/C++)
  static analysis but with the ability to handle some dynamic dispatch such as iterators etc.

- Scans individual files or folders

- Based on flexible, Island Grammar specification that processes compiler AST output, so its robust to
  changes in the AST format with new compiler versions and relatively easy to change (only the grammar changes).
  Currently uses Clang, SpiderMoney and Python ast for input.
- output in CSV tabular format for easy processing by other modules, with utilities to generate graph output

- interoperability filter programs for C/C++ calls Python, Python calls JavaScript and JavaScript calls Python
  that process the monolingual tabular data from multiple monolingual/multilingual files and generates the
  composite call graph fromall files or composite multilingual call graph.

Control Flow Analysis Tools

- generates monolingual control flow information by processing compiler AST and generating control flow at 
  the statement level (more accurate than the line number level)

- output in CSV tabular format for easy processing by other modules

- Written as a two pass process, where the first pass is language dependent and the second is language independent.
  Designed to work with Python, Javascript and C/C++ but only C/C++ and Javascript have been tested

Assignment Collection Tools

- scans monolingual files and collected all variable assignment statements at the statement level (more accurate 
  than the line number level). 

- does some simple static evaluation for assignments to constant numbers and strings. Is written to allow integration of
  a more sophisticated static evaluation module.

- Designed to work with Python, Javascript and C/C++ but only the C/C++ and JavaScript have been implemented and tested.

- output in CSV tabular format for easy processing by other modules

Reaching Definitions Tools

- Uses the information from Control flow analysis and Assignment collection to do a Reaching Definitions Analysis
  for all variables using a worklist algorithm (Nielsen et al 1999). 

- Handles both interprocedure and intraprocedure flows

- output is statement ID of last assignment for every variable, or if the last assignment was to a constant, then that value

- Output in CSV tabular format for easy processing by other modules

Dependencies Tools

- scans folders and generates dependency graph information for multilingual codebases

- handles C/C++ includes, Python imports and JavaScript import and require

- based on a flexible, Island Grammar specification that processes source code directly and
  is relatively easy to update (only the grammar changes).

- output in CSV tabular format for easy processing by other modules, with utilities to generate graph output

- also generates statistics about file types and numbers, degree of inclusion etc.

Fordham University Multilingual Software Analysis Research Group
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