DynSem is a domain-specific language for concise specification of the dynamic semantics of programming languages, aimed at rapid experimentation and evolution of language designs. To maintain a short definition-to-execution cycle, DynSem specifications are meta-interpreted. Meta-interpretation introduces runtime overhead that is difficult to remove by using interpreter optimization frameworks such as the Truffle/Graal Java tools; previous work has shown order-of-magnitude improvements from applying Truffle/Graal to a meta-interpreter, but this is still far slower than what can be achieved with a language-specific interpreter. In this paper, we show how specifying the meta-interpreter using scope graphs, which encapsulate static name binding and resolution information, produces much better optimization results from Truffle/Graal. Furthermore, we identify that JIT compilation is hindered by large numbers of calls between small polymorphic rules and we introduce rule cloning to derive larger monomorphic rules at run time as a countermeasure. Our contributions improve the performance of DynSem-derived interpreters to within an order of magnitude of a handwritten language-specific interpreter.
@InProceedings{vergu_et_al:LIPIcs.ECOOP.2019.4, author = {Vergu, Vlad and Tolmach, Andrew and Visser, Eelco}, title = {{Scopes and Frames Improve Meta-Interpreter Specialization}}, booktitle = {33rd European Conference on Object-Oriented Programming (ECOOP 2019)}, pages = {4:1--4:30}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-111-5}, ISSN = {1868-8969}, year = {2019}, volume = {134}, editor = {Donaldson, Alastair F.}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.4}, URN = {urn:nbn:de:0030-drops-107969}, doi = {10.4230/LIPIcs.ECOOP.2019.4}, annote = {Keywords: Definitional interpreters, partial evaluation} }
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