Comparing Rapid Type Analysis with Points-To Analysis in GraalVM Native Image
David Kozak, Vojin Jovanovic, Codrut Stancu, Tomáŝ Vojnar, Christian Wimmer: Comparing Rapid Type Analysis with Points-To Analysis in GraalVM Native Image. In Proceedings of the International Conference on Managed Programming Languages and Runtimes, pages 129–142. ACM Press, 2023. doi:10.1145/3617651.3622980Abstract
Whole-program analysis is an essential technique that enables advanced compiler optimizations. An important example of such a method is points-to analysis used by ahead-of-time (AOT) compilers to discover program elements (classes, methods, fields) used on at least one program path. GraalVM Native Image uses a points-to analysis to optimize Java applications, which is a time-consuming step of the build. We explore how much the analysis time can be improved by replacing the points-to analysis with a rapid type analysis (RTA), which computes reachable elements faster by allowing more imprecision. We propose several extensions of previous approaches to RTA: making it parallel, incremental, and supporting heap snapshotting. We present an extensive experimental evaluation of the effects of using RTA instead of points-to analysis, in which RTA allowed us to reduce the analysis time for Spring Petclinic (a popular demo application of the Spring framework) by 64% and the overall build time by 35% at the cost of increasing the image size due to the imprecision by 15%.