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Sealed calls in Java packages

Sealed calls in Java packages

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Conference on Object-Oriented Programming, Systems, Lnaguages & Applications (OOPSLA 00)

作者： Zaks, A Feldman, V Aizikowitz, N IBM Corp Res Lab Haifa Israel

Determining the potential targets of virtual method invocations is essential for inter-procedural optimizations of object-oriented programs. It is generally hard to determine such targets accurately. The problem is especially difficult for dynamic languages such as Java, because additional targets of virtual calls may appear at runtime. Current mechanisms that enable inter-procedural optimizations for dynamic languages, repeatedly validate the optimizations at runtime. This paper addresses this predicament by proposing a novel technique for conservative devirtualization analysis, which applies to a significant number of virtual calls in Java programs. Unlike previous work, our technique requires neither whole program analysis nor runtime information, and incurs no runtime overhead. Our solution is very efficient to compute and is based on a newly introduced, seemingly unrelated security feature of Java file archives. On average, our analysis "seals" (safely devirtualizes) about 39% of the virtual calls (to non-final methods) that appear in SPECjvm98 programs, and about 29% of the calls invoked while executing these programs. In the runtime library ***, about 10% of the packages contain a significant percentage (20-60%) of sealed calls, with a total average of about 8.5%. Most of these calls are also shown to be monomorphic, a fact which can be safely exploited by aggressive inter-procedural optimizations such as direct inlining. These results indicate that our technique has a strong potential for enhancing the analysis and optimization of Java programs.

关键词： Call devirtualization Call graph class hierarchy graph Inter-procedural analysis Java Method inlining Object-oriented programming Sealed package

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Sealed calls in Java packages 00

Sealed calls in Java packages

引用

Proceedings of the 15th ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications

作者： Ayal Zaks Vitaly Feldman Nava Aizikowitz IBM Research Laboratory in Haifa Israel

ISBN: (纸本)9781581132007

Determining the potential targets of virtual method invocations is essential for inter-procedural optimizations of object-oriented programs. It is generally hard to determine such targets accurately. The problem is especially difficult for dynamic languages such as Java, because additional targets of virtual calls may appear at runtime. Current mechanisms that enable inter-procedural optimizations for dynamic languages, repeatedly validate the optimizations at runtime. This paper addresses this predicament by proposing a novel technique for conservative devirtualization analysis, which applies to a significant number of virtual calls in Java programs. Unlike previous work, our technique requires neither whole program analysis nor runtime information, and incurs no runtime overhead. Our solution is very efficient to compute and is based on a newly introduced, seemingly unrelated security feature of Java file archives. On average, our analysis "seals" (safely devirtualizes) about 39% of the virtual calls (to non-final methods) that appear in SPECjvm98 programs, and about 29% of the calls invoked while executing these programs. In the runtime library ***, about 10% of the packages contain a significant percentage (20--60%) of sealed calls, with a total average of about 8.5%. Most of these calls are also shown to be monomorphic, a fact which can be safely exploited by aggressive inter-procedural optimizations such as direct inlining. These results indicate that our technique has a strong potential for enhancing the analysis and optimization of Java programs.

关键词： inter-procedural analysis class hierarchy graph Java call graph sealed package method inlining object-oriented programming call devirtualization

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