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  Tutorial: From Writing Programs to Creating Compilers

From Writing Programs to Creating Compilers In this article we build a simple compiler that augments Java with tasks (independent blocks of code that execute in parallel), thus creating a new language called AJ that well supports the programming of syste

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A Readymade Grammar for Java
VisualLangLab is a freely downloadable (GPL) java.net project. To install it, just unzip the distribution file (VisualLangLab.zip) into a directory. The visual parser generator (see Figure 1) is started by clicking on VisualLangLab.jar. The only other thing to keep in mind is that VisualLangLab.jar must be on the classpath when compiling or executing the generated parser.
The heart of any compiler project is the grammar--a typically cryptic piece of text that serves as a specification for the language. Since we wish to augment the capabilities of an existing language (Java), it is simpler to start with an existing grammar for the base language. The starting point for this exercise will therefore be a Java 1.4 grammar included in the VisualLangLab distribution (the file java14C.lkv). Well-written grammars, like well-written programs, are divided into smaller units called rules. A few sample rules from the Java 1.4 grammar (as displayed by the VisualLangLab GUI) are shown in Figure 2 (IfStatement), Figure 3 (SwitchStatement) and Figure 4 (UnaryExpression).


 

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From Writing Programs to Creating Compilers

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