Many development environments incorporate “debuggers” – sophisticated tools that will trace the…

Many development environments incorporate “debuggers” – sophisticated tools that will trace the execution of a compiled program in conjunction with the source code, referring run-time errors to source code statements, allowing the user to interrogate (and even alter) the values of variables by using the identifiers of the source code, and so on. Development of such a system could be a very open-ended project. As a less ambitious project, extend the interpretive compiler for Parva that, in the event of a run-time error, will relate this to the corresponding line in the source, and then print a post-mortem dump showing the values of the variables at the time the error occurred. A (handcrafted) system of this sort was described for the well-known subset of Pascal known as Pascal-S (Wirth 1981, Rees and Robson 1987) and was also used in the implementation of the simple teaching language Umbriel (Terry 1995).

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