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• W2435692892 abstract "Java programs are deployed in a bytecode format that is executed by a Java virtual machine (JVM). JVM performance is determined by several major components: execution engine, garbage collector, and threading system. The static compilation and optimization approach, such as taken in C/C++ compilers, does not fit in Java's execution model very well because Java allows dynamic class loading, lazy resolution, just-in-time (JIT) compilation, and garbage collection. These dynamic features presents new challenges to JVM designers. In this thesis, we study both the challenges and opportunities of dynamic optimizations in Java virtual machines. Our contributions include a new garbage collector using dynamic techniques and dynamic interprocedural program analyses for speculative optimizations in JIT compilers. We present a novel approach for reducing garbage collection frequencies. Instead of relying on an ahead-of-time escape analysis or a region-based type system, our approach adapts regions based on the runtime history of an application. By freeing regions with associated stack frames, the system can reduce the frequency of garbage collections. We present the overall idea and provide details of a specific design and implementation. Dynamic class loading is a two-edged sword. A JIT compiler can speculatively optimize methods base on loaded classes only. However, newly loaded classes may invalidate previous optimization assumptions. We review existing techniques supporting speculative optimizations, including runtime guards, code patching, and on-stack replacement. We present an improvement and implementation of an on-stack replacement mechanism. A call graph is necessary for developing interprocedural program analyses. Call graph construction in a Java virtual machine needs to overcome the difficulties of dynamic class loading and lazy reference resolution. We show a general approach to adapt static type analyses to dynamic versions suitable for building call graphs in a JIT environment. We also introduce a new call graph profiling mechanism using code stubs. Having dynamic call graphs, we study reachability-based interprocedural analysis. We describe a general type analysis framework for supporting speculative method inlining in a JIT environment. Several popular type analyses were implemented in the framework, including an interprocedural one, VTA [SHR+00]. Using the framework, we present the results of a limit study of method inlining and report our findings and experience. In each chapter we discuss the related work for that chapter's topic. At the end of the thesis, we point out future research directions." @default.
• W2435692892 created "2016-06-24" @default.
• W2435692892 creator A5001020752 @default.
• W2435692892 date "2005-01-01" @default.
• W2435692892 modified "2023-09-23" @default.
• W2435692892 title "Runtime techniques and interprocedural analysis in java virtual machines" @default.
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