FLAT 3 : Feature Location & Textual Tracing Tool
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1 FLAT 3 : Feature Location & Textual Tracing Tool Trevor Savage, Meghan Revelle, Denys Poshyvanyk SEMERU William and Mary
2 Addressed Problem The software developer has to maintain large software systems with: Little or no domain knowledge Absence of the original developer Badly organized, missing, or out of date documentation
3 Concept Location in Source Code Change request Concept Location Impact Analysis Implementation Change Propagation Testing
4 Finding a Needle in a Haystack
5 Concept Location with Regular Expressions
6 Shortcomings of Static Concept Location Highly dependent on naming conventions and the developer s experience to write good queries Ignores other existing relationships between software components (such as, dependencies) May miss important parts of the source code
7 Feature Location with Software Reconnaissance - Dynamic Analysis Scenario NOT exercising the feature (trace 1) readanddispatch -- org.eclipse.swt.widgets.display checkdevice -- org.eclipse.swt.widgets.display isdisposed -- org.eclipse.swt.graphics.device drawmenubars -- org.eclipse.swt.widgets.display runpopups -- org.eclipse.swt.widgets.display filtermessage -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control WM_TIMER -- org.eclipse.swt.widgets.control windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control WM_TIMER -- org.eclipse.swt.widgets.control windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control [Wilde 92] [Antoniol 06] Scenario exercising the feature (trace 2) checkdevice -- org.eclipse.swt.widgets.display isdisposed -- org.eclipse.swt.graphics.device drawmenubars -- org.eclipse.swt.widgets.display runpopups -- org.eclipse.swt.widgets.display filtermessage -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control readanddispatch -- org.eclipse.swt.widgets.display checkdevice -- org.eclipse.swt.widgets.display isdisposed -- org.eclipse.swt.graphics.device drawmenubars -- org.eclipse.swt.widgets.display runpopups -- org.eclipse.swt.widgets.display runasyncmessages -- org.eclipse.swt.widgets.display removefirst -- org.eclipse.swt.widgets.synchronizer
8 Shortcomings of Dynamic Concept Location Execution traces are large even for small systems Selecting (ir)relevant scenarios may be difficult Filtering the traces is equally problematic best filtering methods still return hundreds of methods
![SIngle Trace Information Retrieval (SITIR) Source Code Single Execution Trace [ASE 07] readanddispatch -- org.eclipse.swt.widgets.display checkdevice -- org.eclipse.swt.widgets.display isdisposed -- org.](/docs-images/80/81928398/images/9-0.jpg "eclipse.swt.graphics.device drawmenubars -- org.eclipse.swt.widgets.display runpopups -- org.eclipse.swt.widgets.display filtermessage -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control WM_TIMER -- org.")
9 SIngle Trace Information Retrieval (SITIR) Source Code Single Execution Trace [ASE 07] readanddispatch -- org.eclipse.swt.widgets.display checkdevice -- org.eclipse.swt.widgets.display isdisposed -- org.eclipse.swt.graphics.device drawmenubars -- org.eclipse.swt.widgets.display runpopups -- org.eclipse.swt.widgets.display filtermessage -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control WM_TIMER -- org.eclipse.swt.widgets.control windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control WM_TIMER -- org.eclipse.swt.widgets.control windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control readanddispatch -- org.eclipse.swt.widgets.display checkdevice -- org.eclipse.swt.widgets.display isdisposed -- org.eclipse.swt.graphics.device drawmenubars -- org.eclipse.swt.widgets.display runpopups -- org.eclipse.swt.widgets.display filtermessage -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control WM_TIMER -- org.eclipse.swt.widgets.control windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control WM_TIMER -- org.eclipse.swt.widgets.control windowproc -- org.eclipse.swt.widgets.display windowproc -- org.eclipse.swt.widgets.control Information Retrieval Engine
10 Feature Location with SITIR/FLAT 3 1 Query Information Retrieval Engine 5 Indexes 6 Ranks User 7 Results SITIR Source Code Execution scenario Tracer Execution traces Events
11 Collecting Execution Traces in SITIR Java Platform Debugger Architecture (JPDA) 1 Infrastructure to build end-user debugging applications for Java platform JPDA highlights: Debugger works on a separate virtual machine Minimal interference of a tracing tool with a subject program Separate thread-based traces Marked traces (start/stop recording) 1
12 Indexing Software with Apache Lucene Parsing source code and extracting documents corpus is a collection of documents (e.g., methods) Removing non-literals and stop words common words in English, programming language keywords Preprocessing: split_identifiers and SplitIdentifiers Indexing and retrieving semantic information with Lucene
13 Parsing Source Code and Extracting Documents Corpus is a collection of documents (e.g., methods, classes, files)
14 Parsing Source Code and Extracting Documents Corpus is a collection of documents (e.g., methods, classes, files)
15 Source Code is Text Too public void run IProgressMonitor monitor throws InvocationTargetException InterruptedException if m_iflag processcorpus monitor checkupdate else if m_iflag processcorpus monitor UD_UPDATECORPUS else processquerystring monitor if monitor iscancelled throw new InterruptedException the long running
16 Removing Stop Words Common words in English, programming language keywords public void run IProgressMonitor monitor throws InvocationTargetException InterruptedException if m_iflag the processcorpus monitor checkupdate else if m_iflag processcorpus monitor UD_UPDATECORPUS else a processquerystring monitor if monitor iscancelled throw new InterruptedException the long running
17 Splitting Identifiers public void run IProgressMonitor monitor throws InvocationTargetException InterruptedException if m_iflag the processcorpus monitor checkupdate else if m_iflag processcorpus monitor UD_UPDATECORPUS else a processquerystring monitor if monitor iscancelled throw new InterruptedException the long running IProgressMonitor = i progress monitor InvocationTargetException = invocation target exception m_iflag = m i flag UD_UPDATECORPUS = ud updatecorpus
18 Indexing Source Code with Lucene process flag monitor run method1 x x x method2 x x x x x x TF-IDF weighting Similarity Measure: Cosine of the contained angle between the vectors
19 Example of using SITIR Locating a feature in JEdit Feature: showing white-space as a visible symbol in the text area Steps: Run a scenario Run query Explore results
20 Scenario Exercising the Feature Start Tracing
21 Scenario Exercising the Feature Stop Tracing
22 Example of using SITIR/FLAT 3 Results SITIR IR-based rankings Executed methods Number of methods identified in the trace 284 The position of the first relevant method according to IR ranking 56 Position of the first relevant method according to SITIR - 7
23 DEMO: Locating Features in JEdit using FLAT 3 JEdit 105KLOC 910 classes 5,530 methods Feature: Word Count Feature: Save as
24 Other features Annotating features Visualizing results Saving/loading complex traces
25 Acknowledgements ConcernMapper ConcernTagger MuTT AspectBrowser
26 FLAT 3 Download the tool and complete source code at SEMERU web-site:
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