Essentials of Programming Languages
Essentials of Programming Languages (MIT Press, 2008. 3rd edition, ISBN 0-262-06279-8) is a book by Daniel P. Friedman, Mitchell Wand and Christopher T. Haynes on programming languages.
EoPL is a text book that surveys the principles of programming languages from an operational perspective. It starts with an interpreter in Scheme for a simple functional core language similar to the lambda calculus and then systematically adds constructs. For each addition, for example, variable assignment or thread-like control, the book illustrates an increase in expressive power of the programming language and a demand for new constructs for the formulation of a direct interpreter. The book also demonstrates that systematic transformations, say store-passing style or continuation-passing style can eliminate certain constructs from the language in which the interpreter is formulated.
The second part of the book is dedicated to a systematic translation of the interpreter(s) into register machines. The transformations show how to eliminate higher-order closures; continuation objects; recursive function calls; and more. At the end, the reader is left with an "interpreter" that uses nothing but tail-recursive function calls and assignment statements plus conditionals. It becomes trivial to translate this code into a C program or even an assembly program. As a bonus, the book shows how to pre-compute certain pieces of 'meaning' and how to generate a representation of these pre-computations. Since this is the essence of compilation, the book also prepares a course on the principles of compilation and language translation, a related but distinct topic.
Like SICP, EoPL represents a significant departure from the prevailing text book approach in the 1980s. At the time, a book on the principles of programming languages presented four to six (or even more) programming languages and discussed their programming idioms and their implementation at a high level. The most successful books typically covered Algol 60 (and the so-called Algol family of programming languages); Snobol; Lisp; and Prolog. Even today a fair number of text books on programming languages are just such surveys, though their scope has narrowed.
EoPL was started in 1983 when Indiana was one of the leading departments in programming language research. Eugene Kohlbecker, one of Friedman's PhD students, transcribed and collected his "311 lectures". Other faculty members, including Mitch Wand and Christopher Haynes, started contributing and turned "The Hitchhiker's Guide to the Meta-Universe" -- as Kohlbecker had called it -- into the systematic, interpreter and transformation-based survey that it is now. Over the 25 years of its existence, the book has become a near-classic; it is now in its third edition, including additional topics such as 'types' and 'modules'. Its first part now incorporates ideas on programming from HtDP, another non-conventional text book, which uses Scheme to teach the principles of program design. The range of coverage has expanded to cover topics such as 'types' and 'module systems'. The authors as well as Matthew Flatt have recently provided DrScheme plug-ins and language levels for teaching with EoPL.
EoPL has spawned at least two other, related texts: Queinnec's "LIsp in Small Pieces" and Krishnamurthi's "Programming Languages: Applications and Implementations".
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