Experience with a Production Compiler Automatically Generated from an Attribute Grammar

This paper relates our experience implementing a production compiler from an attribute grammar. The compiler is Intel Corporation's Pascal-80 compiler. It runs on a microcomputer-based development system without virtual memory. An attribute grammar was written describing semantic analysis, storage allocation, and translation to intermediate code. Attribute evaluation is done in two alternating passes and the program tree is kept in intermediate files on disk. The first version of the compiler was manually implemented from the attribute grammar. Using what was learned from this experience, an automatic attribute evaluator-generator was then written and a new version or the compiler was mechanically created from the attribute grammar. Various techniques for optimizing the evaluator were tried. Their degree or success is reported and they are compared with other ideas from the literature. Complex attribute-values, such as sets, sequences and finite functions, were carefully implemented using applicative data structure in order to conserve memory. The attribute grammar was designed using the principles or data abstraction and information-hiding. The internal organization or many types or attributes is completely hidden from the attribute grammar author and the attribute evaluator. These values are manipulated only by specific out-of-line semantic functions that can be viewed as the operators or an abstract data type for this attribute. This also contributed to an efficient use of memory

AdaNET phase 0 support for the AdaNET Dynamic Software Inventory (DSI) management system prototype. Catalog of available reusable software components

The Ada Software Repository is a public-domain collection of Ada software and information. The Ada Software Repository is one of several repositories located on the SIMTEL20 Defense Data Network host computer at White Sands Missile Range, and available to any host computer on the network since 26 November 1984. This repository provides a free source for Ada programs and information. The Ada Software Repository is divided into several subdirectories. These directories are organized by topic, and their names and a brief overview of their topics are contained. The Ada Software Repository on SIMTEL20 serves two basic roles: to promote the exchange and use (reusability) of Ada programs and tools (including components) and to promote Ada education