CSC3315 (Spring 2009)1 CSC 3315 Languages & Compilers Hamid Harroud School of Science and Engineering, Akhawayn University

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CSC3315 (Spring 2009)1 CSC 3315 Languages & Compilers Hamid Harroud School of Science and Engineering, Akhawayn University

Contents Overview Lexical Analysis; Grammars Finite Automata; JLex Syntactic analysis; Top-down parsing; Recursive descent & LL(1) parsing Bottom-up parsing; CUP Programming Paradigms: Scheme & Prolog Semantic Processing Code generation & Optimization 2 CSC3315 (Spring 2009)

3 What is a Compiler? CSC3315 (Spring 2009)

Why Study Compilers? To be more effective users of compilers... Instead of treating a compiler as a “black box”. To apply compiler techniques to typical SE tasks that require reading input and taking action. To see how core CS courses fit together, giving you the knowledge to construct a compiler. To participate in R&D of high-level programming languages and optimizing compilers. 4 CSC3315 (Spring 2009)

What is a Language? Language: Any system of formalized symbols, signs, gestures, used or conceived as a means of communicating thought, emotion, etc. Examples: Natural languages, Mathematical notation, High-level programming languages, Assembly language Languages vary widely in appearance, applicability, and complexity. Grammars 5 CSC3315 (Spring 2009)

Syntax & Semantics Syntax: decides whether a sentence in a language is well-formed √ The sun is shining. × Shining is the sun. Semantics: determine the meaning, if any, of a syntactically well-formed sentence √ I read a book. ? The house reads a book. 6 CSC3315 (Spring 2009)

Syntax & Semantics Syntax is easy: Well-understood. Good theory: regular and context-free languages and automata. Good tools, even for complex cases. Semantics are hard: Inherently complex. Variety of choices: Operational — Definitional interpreter Axiomatic — Logic Denotational — Mathematical functions Few tools. 7 CSC3315 (Spring 2009)

Example: Lexical & Syntax Analysis 8 CSC3315 (Spring 2009)

Languages & Compilers Textbook: Concepts of Programming Languages, Robert W. Sebesta, 7 th ed., Addison-Wesley, Concepts of Programming Languages Notes on the class website: Office : Room 10, Bldg 6 Office Hours : MWF 9: :45, MW 14: :30 CSC3315 (Spring 2009)