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By Ian Parberry

ISBN-10: 0470209313

ISBN-13: 9780470209318

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These parse trees represent the syntactic structure of the program. In many cases, no actual parse tree structure is constructed; rather, the information that would be required to build a tree is generated and used directly. Both lexical units and parse trees are further discussed in Chapter 3. Lexical analysis and syntax analysis, or parsing, are discussed in Chapter 4. 4 Intermediate languages sometimes look very much like assembly languages, and in fact, sometimes are actual assembly languages.

Abstraction is a key concept in contemporary programming language design. This is a reflection of the central role that abstraction plays in modern program design methodologies. The degree of abstraction allowed by a programming language and the naturalness of its expression are therefore important to its writability. Programming languages can support two distinct categories of abstraction, process and data. A simple example of process abstraction is the use of a subprogram to implement a sort algorithm that is required several times in a program.

Most programming languages allow some kind of aliasing—for example, two pointers set to point to the same variable, which is possible in most languages. In such a program, the programmer must always remember that changing the value pointed to by one of the two changes the value referenced by the other. Some kinds of aliasing, as described in Chapters 5 and 9 can be prohibited by the design of a language. In some languages, aliasing is used to overcome deficiencies in the language’s data abstraction facilities.

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Complexity of parallel computations by Ian Parberry

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