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Jeannie: Granting Java Native Interface Developers their Wishes

2. FFI: Foreign Function Interface. User Program

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Jeannie: Granting Java Native Interface Developers their Wishes

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    1. 1 Jeannie: Granting Java Native Interface Developers their Wishes

    2. 2 FFI: Foreign Function Interface

    3. 3 JNI = Java Native Interface

    4. 4 FFI Design Goals Productivity Writing & maintaining code Safety Preventing & detecting bugs Efficiency At transition & elsewhere Portability Different OS, HW, virtual execution environment

    5. 5 Jeannie Example

    6. 6 Jeannie Build Process

    7. 7 Translation Scheme

    8. 8 Typing Nested expressions have equivalent types if (`((jboolean)feof(stdin))) ..; Java references are opaque in C Use in nested Java expression Assign to variable Pass as parameter Return as result C can widen Java references `List lst = `new ArrayList(10); C pointers/structs/unions are illegal in Java

    9. 9 Java Garbage Collection

    10. 10 Compiler Stages

    11. 11 Scalable Composition: Syntax

    12. 12 Scalable Composition: Analyzers

    13. 13 Scalable Composition: CodeGen

    14. 14 FFI Design Goals: Revisited Productivity Concise syntax Safety Static error checking Efficiency See next slide Portability Java virtual machines: HotSpot, J9, Jikes RVM Operating systems: Mac OS X, Linux, Cygwin

    15. 15 Efficiency: JNI vs. Jeannie

    16. 16 Nested expression is simple: for (i = 0, n = `ja.length; i < n; i++) s += `ja[`i]; Array Access

    17. 17 Efficiency: Bulk vs. Simple Array Access

    18. 18 Related Work Improving JNI Productivity: Bubak+Kurzyniec (Janet) Safety: Tan et al. (Ccured, ILEA), Furr+Foster (type inference) Efficiency: Stepanian et al. (JIT native code) Portability: Chen et al. (dynamic binary translator) Deep language interoperability XJ, XTATIC, C?, Linq, DALI Scalable composition Polyglot, JastAdd, Silver, Stratego/XT, Safari

    19. 19 Conclusions Have: Language: Jeannie = FFI(Java+C) Open source compiler contributed to xtc http://cs.nyu.edu/rgrimm/xtc Next: Debugging Fault isolation Optimization

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