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Sun 20 - Fri 25 October 2019 Athens, Greece
Fri 25 Oct 2019 15:07 - 15:30 at Olympia - Implementation Chair(s): Jens Palsberg

Languages like Java and C# follow a two-step process of compilation: static compilation and just-in-time (JIT) compilation. As the time spent in JIT compilation gets added to the execution-time of the application, JIT compilers typically sacrifice the precision of program analyses for efficiency. e alternative of performing the analysis for the whole program statically, ignores the analysis of libraries (available only at runtime), and thereby generates imprecise results. To address these issues, in this paper, we propose a two-step (static+JIT) analysis framework called PYE that helps generate precise analysis-results at runtime, at a very low cost.

PYE achieves the twin objectives of precision and performance during JIT compilation, by using a two- pronged approach: (i) It performs expensive analyses during static compilation, while accounting for the unavailability of the runtime libraries by generating partial results, in terms of conditional values, for the input application. (ii) During JIT compilation, PYE resolves the conditions associated with these values, using the pre-computed conditional values for the libraries, to generate the final results. We have implemented the static and the runtime components of PYE in the Soot optimization framework and the OpenJDK HotSpot Server Compiler (C2), respectively. We demonstrate the usability of PYE by instantiating it to perform two context-, flow-, and field-sensitive heap-based analyses: (i) points-to analysis for null-dereference-check elimination; and (ii) escape analysis for synchronization elimination. We evaluate these instantiations against their corresponding state-of-the-art implementations in C2 over a wide range of benchmarks. The extensive evaluation results show that our strategy works quite well and fulfils both the promises it makes: enhanced precision while maintaining efficiency during JIT compilation.

Fri 25 Oct
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14:00 - 15:30: ImplementationOOPSLA at Olympia
Chair(s): Jens PalsbergUniversity of California, Los Angeles
14:00 - 14:22
Ahmet CelikThe University of Texas at Austin, Pengyu NieThe University of Texas at Austin, Chris RossbachThe University of Texas at Austin and VMware Research Group, Milos GligoricThe University of Texas at Austin
14:22 - 14:45
Christian WimmerOracle Labs, Codrut StancuOracle Labs, Peter HoferOracle Labs, Vojin JovanovicOracle Labs, Paul WögererOracle Labs, Peter B. KesslerOracle Labs, Oleg PlissOracle Labs, Thomas WuerthingerOracle Labs
DOI Pre-print
14:45 - 15:07
Link to publication DOI File Attached
15:07 - 15:30
Manas ThakurIIT Madras, V Krishna NandivadaIIT Madras