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General Information

 o Eli: Translator Construction Made Easy
 o Global Index
 o Frequently Asked Questions


 o Quick Reference Card
 o Guide For new Eli Users
 o Release Notes of Eli
 o Tutorial on Name Analysis
 o Tutorial on Type Analysis

Reference Manuals

 o User Interface
 o Eli products and parameters
 o LIDO Reference Manual


 o Eli library routines
 o Specification Module Library

Translation Tasks

 o Lexical analysis specification
 o Syntactic Analysis Manual
 o Computation in Trees


 o LIGA Control Language
 o Debugging Information for LIDO
 o Graphical ORder TOol

 o FunnelWeb User's Manual

 o Pattern-based Text Generator
 o Property Definition Language
 o Operator Identification Language
 o Tree Grammar Specification Language
 o Command Line Processing
 o COLA Options Reference Manual

 o Generating Unparsing Code

 o Monitoring a Processor's Execution


 o System Administration Guide

Open PDF File

Tutorial on Type Analysis

This tutorial is an introduction to the solution of the type analysis task required for programming language implementation. It demonstrates many aspects of that task which may occur in programming languages or in special purpose languages. The tutorial demonstrates how the components of Eli's type analysis library are used to solve that task. The tutorial proceeds from basic aspects, such as declarations, typed entities, and overloaded operators, up to more complex aspects, such as type definitions and function types.

This tutorial may be used for a practical introduction to the specification techniques for type analysis, or as a source of examples that show how to solve certain problems, or it may give hints for language design.

This file is an executable specification. An analyzer for an artificial language can be generated from it. The language is kept small by restricting it to those constructs necessary to demonstrate type analysis tasks, not regarding its usability for programming. The generated analyzer produces output that reports the result of type analysis, i.e. the type property of program entities, and error reports where examples violate specified language properties.

The explanations in this tutorial assume that the reader is familiar with the use of the Eli system, with the use of its module library, and knows the general description of the type analysis task in the documentation of the module library. Furthermore, the reader should be familiar with basic concepts of the name analysis task. Its solution is a precondition for type analysis. It is described only briefly in this text. There is a separate tutorial for name analysis, see Overview of Tutorial on Name Analysis.

Chapter 1 specifies a small language kernel and solves the name analysis and the type analysis task for it. The focus of the following chapters is on type analysis only. The topics are arranged in an order such that no forward references are needed. Readers may stop reading at any section after section 7. They then have a complete description of the type analysis task for a language that has the constructs and concepts introduced so far. (It should even be possible to drop the rest of the specification and generate an analyzer for the language specified so far. This feature has not yet been tried.) For that purpose the example language is presented such that from section 5 on each section augments the language by some new constructs and concepts that demonstrate the aspect of concern. Readers are asked for some patience until they see what the whole language is.