Memories of Bug Fixes

Memories of Bug-Fixes Sunghun Kim, Kai Pan, Jim Whitehead {hunkim, pankai, ejw}@cs.ucsc.edu University of California, Santa Cruz

What is a bug (Zeller 2006)? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bugs? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bugs? ,[object Object],[object Object],[object Object]

[object Object],[object Object],Project-Specific Bug Fix Patterns JEditTextArea.java at transaction 114 - setSelectedText(""); + insertTab(); JEditTextArea.java at transaction 86 - setSelectedText(""); + insertTab();

Bug? ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Project-Specific Bug Fix Patterns

Horizontal and Vertical Bug Patterns Buffer over run Horizontal : general bugs Vertical : project specific Null dereference JEdit example Eclipse example

Bug-Fix Memories – Basic Idea Extract patterns in bug fix change history …… Bug fix changes in revision 1 .. n-1 Memory

Bug-Fix Memories – Basic Idea Extract patterns in bug fix change history …… Search for patterns against Memory Bug fix changes in revision 1 .. n-1 Memory Code to examine

Talk Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Retrieving Bug Fix Changes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bug-introducing and Bug-fix Changes Development history of foo.java SCM log message: “Bug #567 fixed” “ bug fix” Bug #567 entered into issue tracking system (bug finally observed and recorded) Software change that introduces the bug “bug-introducing”

Kenyon Processing SCM Repository Filesystem Extract Automated configuration extraction Save Persist gathered metrics & facts Kenyon Repository (RDBMS/ Hibernate) Analyze Query DB, add new facts Analysis Software (e.g., IVA) Compute Fact extraction (metrics, static analysis) Kenyon

Commits, Transactions & Configurations transactions configurations CVS file commits Added feature X Fixed null ptr bug Modified button text Added feature Y log message

Hunks, and Hunk Pairs Revision n-1 (has bug hunks) Revision n (has fix hunks) modification addition deletion added hunk hunk pair type deleted hunk empty deleted hunk empty added hunk

Detecting Vertical Bugs (Patterns) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Process for Abstracting Code ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Raw Component Extraction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Raw Component Extraction Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],if > && . . foo flag 5 foo ready() ready

Normalization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Information Filtering Goal ,[object Object],[object Object],[object Object],[object Object]

Information Filtering Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Diff Filtering and Storing Memories ,[object Object],[object Object],[object Object],[object Object],[object Object]

Searching the Memory ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

IDE Integration Bug detection Fix suggestion

Evaluation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Half and Full Hit Build memories based on transaction 1 .. n-1 …… Transaction 1 .. n-1 Memories Bug | Fix Fix change case at transaction n Half hit Full hit

True and False Positives Build memories based on transaction 1 .. n-1 …… False positive half hit, if found True positive half hit, if found Transaction 1 .. n-1 Memories Non-fix change case at transaction n Fix change case at transaction n

True Positive and False Positive Full Hit Rates

True Positive and False Positive Full Hit Rates ,[object Object],[object Object],[object Object]

PMD VS Fix Memories ,[object Object],Bug

PMD VS Fix Memories ,[object Object],Bug PMD

PMD VS Fix Memories ,[object Object],Bug PMD Fix Memories

PMD VS Fix Memories ,[object Object],[object Object],40.3% 6.5% PMD Fix Memories 3% ArgoUML 38.7% 6.5% PMD Fix Memories 2.3% Eclipse

Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Future Work ,[object Object],[object Object],[object Object],[object Object],[object Object]

Memories of Bug Fixes

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