The first is that compilers help to solve the problems of traditional special-purpose languages. Languages such as C are prone to a long set of problems which, collectively, are called "low-level" problems. For example, C compilers need to make sure that instructions are executed correctly, every time without failure. This often means machine instructions need to be defined and analyzed more carefully, taking into account not only hardware but also the compiler itself. Simultaneously, the compiler must be able to distribute the work between multiple processors and even across networks, so that latency of communication and load can be kept to a minimum.
The second is that knowing how a compiler works can help programmers to better understand and solve complex software problems. Programming is hard enough that the best programmers know how to specialize in different kinds of problems. Knowing how compilers work gives them an advantage in understanding the underlying, extremely complex technology of any system. Even a compiler is only a complicated piece of software, affected by the C language and the architecture of modern computers. Any deeper understanding of how the language interacts with the environment helps programmers to debug and analyze complex problems.
Third, if you are a programmer who needs to write compilers for your software, you will learn something about the C language. Your experience with using your compiler will help you to learn the language better.
There are a lot of obstacles that must be overcome to build a high-quality compiler. The book examines how lcc was designed to address these obstacles and why it works well, even on modern computers. Additionally, the book will help you to write your own compiler for C.
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