Introduction to Compiler Design (Undergraduate Topics in by Torben Ægidius Mogensen

By Torben Ægidius Mogensen

This textbook is meant for an introductory path on Compiler layout, appropriate to be used in an undergraduate programme in desktop technological know-how or comparable fields.

Introduction to Compiler layout offers ideas for making sensible, notwithstanding non-optimizing compilers for easy programming languages utilizing equipment which are just about these utilized in "real" compilers, albeit just a little simplified in areas for presentation reasons. All levels required for translating a high-level language to laptop language is roofed, together with lexing, parsing, intermediate-code new release, machine-code iteration and check in allocation. Interpretation is roofed briefly.

Aiming to be impartial with admire to implementation languages, algorithms are awarded in pseudo-code instead of in any particular programming language, and proposals for implementation in numerous various language flavors are in lots of instances given. The innovations are illustrated with examples and exercises.

The writer has taught Compiler layout on the college of Copenhagen for over a decade, and the booklet is predicated on fabric utilized in the undergraduate Compiler layout direction there.

Additional fabric to be used with this publication, together with options to chose routines, is on the market at http://www.diku.dk/~torbenm/ICD

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1 Compiling Source Files By the end of the design stage, you should have defined a set of routines, called functions, each of which solves a small piece of the larger programming problem. The next step is to actually write the code for each function. This is usually done by creating and editing C language text files. These files are called source files. 12 Chapter 2 Box 2-1: Compiling and Linking In a UNIX Environment In UNIX environments, you edit the SOUTce files with a text editor, such as ed or vi.

Comments are for human readers-the compiler ignores them. Commenting programs is an important, though often-neglected, aspect of software engineering. The C language allows you to enter comments by inserting text between the symbols 1* and *I. In the following example, the asterisks that begin each line are included to aid readability-only the first and last ones are required. /* square() * Author: P. Margolis * Initial coding: 3/87 * Purpose: * This function returns the square of its * argument.

The \n sequence is a special sequence that forces printf() to output a newline character, causing the cursor to move to the beginning of the next line. c, and square () is located in a file called square . i The getsquare program still isn't very useful, how~ver, since it can only print the square of one number. To find out the squares of other numbers, we would have to edit the source file, change the argument to square() , and then re-compile, re-link, and re-execute the program. It would be better if we could dynamically specify which number we want to square while getsquare is running.

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