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Swift Fox Programming Sensor Networks for Fun and Profit

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Swift Fox Programming Sensor Networks for Fun and Profit Introduction Language internals Compiler details Conclusion Swift Fox Programming sensor networks for fun and profit Marcin Szczodrak1 Vasileios P. Kemerlis1 Xuan Linh Vu2 Yiwei Gu2 Programing Languages and Translators (PLT) Computer Science Department Columbia University 1{msz, vpk}@cs.columbia.edu 2{xv2103, yg2181}@cs.columbia.edu 04/26/2010 http://nslvm2.cs.columbia.edu Swift Fox Introduction Language internals Compiler details Conclusion Outline 1 Introduction (Marcin Szczodrak) Overview Problem statement Swift Fox language 2 Language internals (Vasileios Kemerlis) Language constructs Syntactic structures 3 Compiler details (Yiwei Gu) Compiler architecture Development tools Testing tools 4 Conclusion (Xuan Linh Vu) Lessons learned Why Swift Fox http://nslvm2.cs.columbia.edu Swift Fox Introduction Overview Language internals Problem statement Compiler details Swift Fox Conclusion Outline 1 Introduction (Marcin Szczodrak) Overview Problem statement Swift Fox language 2 Language internals (Vasileios Kemerlis) Language constructs Syntactic structures 3 Compiler details (Yiwei Gu) Compiler architecture Development tools Testing tools 4 Conclusion (Xuan Linh Vu) Lessons learned Why Swift Fox http://nslvm2.cs.columbia.edu Swift Fox Introduction Overview Language internals Problem statement Compiler details Swift Fox Conclusion Wireless Sensor Networks What are they? wireless ad-hoc networks multipurpose sensor nodes (motes) small low-cost, low-power self-organizing capabilities ultimately at the size of a grain of sand (smart dust) Figure: Tiny mote (courtesy of MIT Technology Review) http://nslvm2.cs.columbia.edu Swift Fox Introduction Overview Language internals Problem statement Compiler details Swift Fox Conclusion Wireless Sensor Networks Why bother? WSNs are pervasive military (battlefield surveillance, reconnaissance) environment (pollution monitoring, chemical detection) home automation (“smart home”) commercial domain but... no standardized system facilities absence of high-level abstractions “single” image implementations http://nslvm2.cs.columbia.edu Swift Fox Introduction Overview Language internals Problem statement Compiler details Swift Fox Conclusion Swift Fox Bringing back the fun in WSN programming simple, event-driven language for describing reconfiguration policies for WSNs event driven domain specific policy oriented lightweight simple secure robust declarative network-savvy service oriented Figure: Buzzwords for Swift Fox http://nslvm2.cs.columbia.edu Swift Fox Introduction Overview Language internals Problem statement Compiler details Swift Fox Conclusion Swift Fox Distinctive characteristics simple, simple, simple enables code/logic re-use releases the programmer from the burden of dealing with WSN OS internals, event handling, data scatter/gather, network and routing protocol details first programming language for WSN applications solve the “problem” and avoid plumbing http://nslvm2.cs.columbia.edu Swift Fox Introduction Language internals Constructs Compiler details Syntax Conclusion Outline 1 Introduction (Marcin Szczodrak) Overview Problem statement Swift Fox language 2 Language internals (Vasileios Kemerlis) Language constructs Syntactic structures 3 Compiler details (Yiwei Gu) Compiler architecture Development tools Testing tools 4 Conclusion (Xuan Linh Vu) Lessons learned Why Swift Fox http://nslvm2.cs.columbia.edu Swift Fox Introduction Language internals Constructs Compiler details Syntax Conclusion Swift Fox Essential constructs configuration: binding between an application and a network protocol event-condition: predicate that becomes true when a specific sensor reading satisfies a condition policy: transition specification between different configuration, upon event-conditions Example configuration too-cold {Send-Temp CTP} event-condition cold-day {Temperature < 70F} from any goto too-cold when cold-day http://nslvm2.cs.columbia.edu Swift Fox Introduction Language internals Constructs Compiler details Syntax Conclusion # define configurations configuration sleep-day {nothing CTP} configuration sleep-night {nothing CTP} configuration too-cold {Send-Temp CTP} # define time passing events event-condition day {Timer = 16hr} event-condition night {Timer = 8hr} # define temperature sensing events event-condition cold-day {Temperature < 70F } event-condition cold-night {Temperature < 60F } # reconfiguration policies from any goto sleep-day when day from any goto sleep-night when night from sleep-day goto too-cold when cold-day from sleep-night goto too-cold when cold-night from too-cold goto sleep-day when not cold-day from too-cold goto sleep-night when not cold-night # and finally, the initial configuration start sleep-day http://nslvm2.cs.columbia.edu Swift Fox Introduction Language internals Constructs Compiler details Syntax Conclusion Swift Fox Example tree swift-fox-program configurations event-conditions policies initial-state . configuration . event-condition . policy start sleep-day . configuration sleep-day { nothing CTP } event-condition cold-day { Temperature < 70F } from sleep-day goto too-cold when cold-day Figure: AST for the previous code snippet http://nslvm2.cs.columbia.edu Swift Fox Introduction Compiler architecture Language internals Development Compiler details Testing Conclusion Outline 1 Introduction (Marcin Szczodrak) Overview Problem statement Swift Fox language 2 Language internals (Vasileios Kemerlis) Language constructs Syntactic structures 3 Compiler details (Yiwei Gu) Compiler architecture Development tools Testing tools 4 Conclusion (Xuan Linh Vu) Lessons learned Why Swift Fox http://nslvm2.cs.columbia.edu Swift Fox Introduction Compiler architecture Language internals Development Compiler details Testing Conclusion Swift Fox Compiler block diagram SWIFT FOX COMPILER C FLEX BISON CODE SWIFT FOX CODE FENNEC FOX LEXER PARSER CODE GENERATOR CODE - nesC nesC with C cross-compiler FENNEC FOX + PLATFORM + FENNEC FOX system image CODE - nesC machine code Figure: Swift Fox block diagram http://nslvm2.cs.columbia.edu Swift Fox Introduction Compiler architecture Language internals Development Compiler details Testing Conclusion Swift Fox Development tools development Lex (flex), YACC (bison) nesC, TinyOS make management & documentation Trac (web-management and bug-tracking) Subversion (revision control) LATEX http://nslvm2.cs.columbia.edu Swift Fox Introduction Compiler architecture Language internals Development Compiler details Testing Conclusion Swift Fox Testing procedure assume correctness of the front-end generators and execution environment (e.g., Lex, YACC, nesC, TinyOS, Fennec Fox) combination of unit and regression testing separate regression testing suites for the lexer, parser, and code generator http://nslvm2.cs.columbia.edu Swift Fox Introduction Language internals Lessons Compiler details Why Swift Fox Conclusion Outline 1 Introduction (Marcin Szczodrak) Overview Problem statement Swift Fox language 2 Language internals (Vasileios Kemerlis) Language constructs Syntactic structures 3 Compiler details (Yiwei Gu) Compiler architecture Development tools Testing tools 4 Conclusion (Xuan Linh Vu) Lessons learned Why Swift Fox http://nslvm2.cs.columbia.edu Swift Fox Introduction Language internals Lessons Compiler details Why Swift Fox Conclusion Swift Fox What we learned testing is important keep it simple, add features steadily documentation helps! project management is hard http://nslvm2.cs.columbia.edu Swift Fox Introduction Language internals Lessons Compiler details Why Swift Fox Conclusion Why Swift Fox? first language (of that kind) out there simpler than coding in nesC solve the “problem” and avoid plumbing Try it! (coming soon...) http://nslvm2.cs.columbia.edu http://nslvm2.cs.columbia.edu Swift Fox.
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