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Refining Syntactic Sugar: Tools for Supporting Macro Development A dissertation presented by Ryan Pepper to the Faculty of the Graduate School of the College of Computer and Information Science in

Macros and SML. Ext;, were written to support a compiler and its code generation back-end, that would have been of little use without them. Since Scheme macros are a core technology in the Scheme operating system and most Scheme programs are compiled ahead of time, these macros have become standard in Scheme implementations. Their use is a crucial component of Scheme's success for three main reasons. The use of macros creates an opportunity to replace the intermediate state of a large Scheme program (see refocusing), which can have significant implications for program complexity and speed. The use of macros allows the compiler to provide a higher-order framework that provides an efficient way to write higher-order functions. The use of macros allows the compiler to abstract over the state of the machine, so the resulting program can be executed efficiently, without knowing which parts of that program will be evaluated at run time. Many Scheme implementations have been written without SML-style macros, which require an entirely different programming environment. Yet SML supports macros, and is an obvious candidate for such an implementation. While SML is a rich system, it can suffer from many of the same problems as Scheme, notably a lack of extensibility, and a lack of proper library support. At Northeastern University, we offer a full-stack approach to developing rich and scalable systems, and Scheme macros have been a fundamental component of this. The use of macros has had two broad applications. First, it allows the compiler to replace the intermediate state of a large Scheme program (see refocusing) with a small subset, without having to re-compile the complete program. In turn, this allows the compiler to provide a higher-level framework that provides an efficient way to write higher-order functions. Second, using macros in conjunction with the compiler, SML's support of rich libraries, and the ability to provide a fully extensible environment enables the development of powerful tools as well, such as debuggers, profilers, and theorem proves. This thesis examines the capabilities of two of these tools, a debugger and a profiler, which are designed to make it easier to debug large Scheme programs through a full suite of profiling tools.

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