Implementation of Functional Languages: 9th International by Simon Peyton Jones, Thomas Nordin, Dino Oliva (auth.), Chris

By Simon Peyton Jones, Thomas Nordin, Dino Oliva (auth.), Chris Clack, Kevin Hammond, Tony Davie (eds.)

This ebook constitutes the completely refereed post-workshop lawsuits of the ninth foreign Workshop on Implementation of practical Languages, IFL'97, held in St. Andrews, Scotland, united kingdom, in September 1997.
The 21 revised complete papers offered have been chosen from the 34 papers authorized for presentation on the workshop in the course of a moment around of thorough a-posteriori reviewing. The ebook is split in sections on compilation, varieties, benchmarking and profiling, parallelism, interplay, language layout, and rubbish collection.

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Additional info for Implementation of Functional Languages: 9th International Workshop, IFL'97 St. Andrews, Scotland, UK September 10–12, 1997 Selected Papers

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Uw(); } Fig. 9. Application node methods. efficient implementation discards the frame of the first function before allocating that for the second. Unfortunately, the Java Virtual Machine is not required to implement tail calls like this, and so we must use a well-known trick to achieve the proper behaviour. The trick is a variant of the “UUO handler” invented for the Rabbit Scheme compiler [6] and later popularised as the “tiny interpreter” by the Glasgow Haskell compiler [2]. A tail call is made by returning a function node object whose rn is to be invoked, rather than by invoking this method directly.

This involves adding run-time variables (in the logic programming sense), changing the details of execution order, and changing the approach to such things as strictness, sharing and updating, largely by replacing built-in functions by alternatives. Although experiments on all these fronts have been carried out, more work is needed to provide the Brisk system with a convenient development environment, and to investigate its efficiency, particularly in comparison to the STG Machine. Almost all of the optimisations which can be carried out before reaching the STG language (or from STG to STG) are also applicable in the Brisk setting; however, they have not been implemented in Brisk, making direct comparisons difficult at present.

This involves plugging the current node into the previous node (pointed to by the top of the stack) at the specified argument position, making the previous node into the new current node, and popping the stack. An evaluation step consists of calling the evaluation code for the current node. If the current node is already in head evaluated form, the code causes an immediate return. Otherwise, the code carries out some processing, usually ending with a tail call. Notionally, a tail call consists of building a new node in the heap and making it current.

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